[RESEND RFC PATCH 00/32] separate operations from flags in the bio/request structs

[RESEND RFC PATCH 00/32] separate operations from flags in the bio/request structs

[mchristi]

This is just a resend of the patchset from earlier today. There was
a error in the middle of sending the set, so it looks like 10 - 32 got
dropped.

There are a couple new block layer commands we are trying to add support
for in the near term:

compare and write
http://www.spinics.net/lists/target-devel/msg07826.html

copy offload/extended copy/xcopy
https://www.redhat.com/archives/dm-devel/2014-July/msg00070.html

The problem is if we contine to add more commands we will have to one day
extend the cmd_flags/bi_rw fields again. To prevent that, this patchset
separates the operation (REQ_WRITE, REQ_DISCARD, REQ_WRITE_SAME, etc) from
the flags (REQ_SYNC, REQ_QUIET, etc) in the bio and request structs. In the
end of this set, we will have two fields bio->bi_op/request->op and
bio->bi_rw/request->cmd_flags.

The patches were made against Jens's linux-block tree's for-linus branch:
https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git/log/?h=for-linus
(last commit a22c4d7e34402ccdf3414f64c50365436eba7b93).

I have done some basic testing for a lot of the drivers and filesystems,
but I wanted to get comments before trying to track down more hardware/
systems for testing.


Known issues:
- REQ_FLUSH is still a flag, but should probably be a operation.
 For lower level drivers like SCSI where we only get a flush, it makes
more sense to be a operation. However, upper layers like filesystems
can send down flushes with writes, so it is more of a flag for them.
I am still working on this.

- There is a regression with the dm flakey target. It currently
cannot corrupt the operation values.

- The patchset is a little awkward. It touches so much code,
but I wanted to maintain git bisectibility, so there is lots of compat code
left around until the last patches where everyting is cleaned up.

[PATCH 01/32] block/fs: add REQ_OP definitions.

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch adds definitions for request/bio operations which
will be used in the next patches.

In the initial patches the REQ_OPs match the REQ ones for compat reasons
while all the code is converted in this set. In the last patches
that will be removed.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 include/linux/blk_types.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index e813013..d7b6009 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -244,4 +244,11 @@ enum rq_flag_bits {
 #define REQ_MQ_INFLIGHT		(1ULL << __REQ_MQ_INFLIGHT)
 #define REQ_NO_TIMEOUT		(1ULL << __REQ_NO_TIMEOUT)
 
+enum req_op {
+	REQ_OP_READ,
+	REQ_OP_WRITE		= REQ_WRITE,
+	REQ_OP_DISCARD		= REQ_DISCARD,
+	REQ_OP_WRITE_SAME	= REQ_WRITE_SAME,
+};
+
 #endif /* __LINUX_BLK_TYPES_H */
-- 
1.8.3.1

[PATCH 02/32] block/fs/mm: prepare submit_bio_wait users for bi_rw split

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch prepares submit_bio_wait callers for the next
patches that split bi_rw into a operation and flags field.
Instead of passing in a bitmap with both the operation and
flags mixed in, the callers now pass them in seperately.

Temp issue: When the fs.h read/write types, like WRITE_SYNC or
WRITE_FUA, are used we still pass in the operation along with the
flags in the flags argument. When all the code has been converted
that will be cleaned up. It is left in here for compat and git
bisect use and to try and make the patches smaller.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 block/bio.c                |  8 ++++----
 block/blk-flush.c          |  2 +-
 drivers/md/bcache/debug.c  |  4 ++--
 drivers/md/md.c            |  2 +-
 drivers/md/raid1.c         |  2 +-
 drivers/md/raid10.c        |  2 +-
 fs/btrfs/check-integrity.c |  8 ++++----
 fs/btrfs/check-integrity.h |  2 +-
 fs/btrfs/extent_io.c       |  2 +-
 fs/btrfs/scrub.c           |  6 +++---
 fs/ext4/crypto.c           |  2 +-
 fs/f2fs/segment.c          |  4 ++--
 fs/hfsplus/hfsplus_fs.h    |  2 +-
 fs/hfsplus/part_tbl.c      |  5 +++--
 fs/hfsplus/super.c         |  6 ++++--
 fs/hfsplus/wrapper.c       | 14 ++++++++------
 fs/logfs/dev_bdev.c        |  2 +-
 include/linux/bio.h        |  2 +-
 kernel/power/swap.c        | 30 ++++++++++++++++++------------
 19 files changed, 58 insertions(+), 47 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index ad3f276..610c704 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -859,21 +859,21 @@ static void submit_bio_wait_endio(struct bio *bio)
 
 /**
  * submit_bio_wait - submit a bio, and wait until it completes
- * @rw: whether to %READ or %WRITE, or maybe to %READA (read ahead)
+ * @op: REQ_OP_*
+ * @flags: rq_flag_bits
  * @bio: The &struct bio which describes the I/O
  *
  * Simple wrapper around submit_bio(). Returns 0 on success, or the error from
  * bio_endio() on failure.
  */
-int submit_bio_wait(int rw, struct bio *bio)
+int submit_bio_wait(int op, int flags, struct bio *bio)
 {
 	struct submit_bio_ret ret;
 
-	rw |= REQ_SYNC;
 	init_completion(&ret.event);
 	bio->bi_private = &ret;
 	bio->bi_end_io = submit_bio_wait_endio;
-	submit_bio(rw, bio);
+	submit_bio(op | flags | REQ_SYNC, bio);
 	wait_for_completion(&ret.event);
 
 	return ret.error;
diff --git a/block/blk-flush.c b/block/blk-flush.c
index 9c423e5..f707ba1 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -485,7 +485,7 @@ int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
 	bio = bio_alloc(gfp_mask, 0);
 	bio->bi_bdev = bdev;
 
-	ret = submit_bio_wait(WRITE_FLUSH, bio);
+	ret = submit_bio_wait(REQ_OP_WRITE, WRITE_FLUSH, bio);
 
 	/*
 	 * The driver must store the error location in ->bi_sector, if
diff --git a/drivers/md/bcache/debug.c b/drivers/md/bcache/debug.c
index 8b1f1d5..001f5f1 100644
--- a/drivers/md/bcache/debug.c
+++ b/drivers/md/bcache/debug.c
@@ -54,7 +54,7 @@ void bch_btree_verify(struct btree *b)
 	bio->bi_iter.bi_size	= KEY_SIZE(&v->key) << 9;
 	bch_bio_map(bio, sorted);
 
-	submit_bio_wait(REQ_META|READ_SYNC, bio);
+	submit_bio_wait(REQ_OP_READ, READ_SYNC, bio);
 	bch_bbio_free(bio, b->c);
 
 	memcpy(ondisk, sorted, KEY_SIZE(&v->key) << 9);
@@ -117,7 +117,7 @@ void bch_data_verify(struct cached_dev *dc, struct bio *bio)
 	if (bio_alloc_pages(check, GFP_NOIO))
 		goto out_put;
 
-	submit_bio_wait(READ_SYNC, check);
+	submit_bio_wait(REQ_OP_READ, READ_SYNC, check);
 
 	bio_for_each_segment(bv, bio, iter) {
 		void *p1 = kmap_atomic(bv.bv_page);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index c702de1..1ca5959 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -771,7 +771,7 @@ int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
 	else
 		bio->bi_iter.bi_sector = sector + rdev->data_offset;
 	bio_add_page(bio, page, size, 0);
-	submit_bio_wait(rw, bio);
+	submit_bio_wait(rw, 0, bio);
 
 	ret = !bio->bi_error;
 	bio_put(bio);
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index d9d031e..527fdf5 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -2195,7 +2195,7 @@ static int narrow_write_error(struct r1bio *r1_bio, int i)
 		bio_trim(wbio, sector - r1_bio->sector, sectors);
 		wbio->bi_iter.bi_sector += rdev->data_offset;
 		wbio->bi_bdev = rdev->bdev;
-		if (submit_bio_wait(WRITE, wbio) < 0)
+		if (submit_bio_wait(REQ_OP_WRITE, 0, wbio) < 0)
 			/* failure! */
 			ok = rdev_set_badblocks(rdev, sector,
 						sectors, 0)
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 96f3659..69352a6 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2470,7 +2470,7 @@ static int narrow_write_error(struct r10bio *r10_bio, int i)
 				   choose_data_offset(r10_bio, rdev) +
 				   (sector - r10_bio->sector));
 		wbio->bi_bdev = rdev->bdev;
-		if (submit_bio_wait(WRITE, wbio) < 0)
+		if (submit_bio_wait(REQ_OP_WRITE, 0, wbio) < 0)
 			/* Failure! */
 			ok = rdev_set_badblocks(rdev, sector,
 						sectors, 0)
diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
index 541fbfa..fd50b2f 100644
--- a/fs/btrfs/check-integrity.c
+++ b/fs/btrfs/check-integrity.c
@@ -1695,7 +1695,7 @@ static int btrfsic_read_block(struct btrfsic_state *state,
 			       "btrfsic: error, failed to add a single page!\n");
 			return -1;
 		}
-		if (submit_bio_wait(READ, bio)) {
+		if (submit_bio_wait(REQ_OP_READ, 0, bio)) {
 			printk(KERN_INFO
 			       "btrfsic: read error at logical %llu dev %s!\n",
 			       block_ctx->start, block_ctx->dev->name);
@@ -3064,10 +3064,10 @@ void btrfsic_submit_bio(int rw, struct bio *bio)
 	submit_bio(rw, bio);
 }
 
-int btrfsic_submit_bio_wait(int rw, struct bio *bio)
+int btrfsic_submit_bio_wait(int op, int op_flags, struct bio *bio)
 {
-	__btrfsic_submit_bio(rw, bio);
-	return submit_bio_wait(rw, bio);
+	__btrfsic_submit_bio(op | op_flags, bio);
+	return submit_bio_wait(op, op_flags, bio);
 }
 
 int btrfsic_mount(struct btrfs_root *root,
diff --git a/fs/btrfs/check-integrity.h b/fs/btrfs/check-integrity.h
index 13b8566..13b0d54 100644
--- a/fs/btrfs/check-integrity.h
+++ b/fs/btrfs/check-integrity.h
@@ -22,7 +22,7 @@
 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
 int btrfsic_submit_bh(int rw, struct buffer_head *bh);
 void btrfsic_submit_bio(int rw, struct bio *bio);
-int btrfsic_submit_bio_wait(int rw, struct bio *bio);
+int btrfsic_submit_bio_wait(int op, int op_flags, struct bio *bio);
 #else
 #define btrfsic_submit_bh submit_bh
 #define btrfsic_submit_bio submit_bio
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 3915c94..9a68a83 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2071,7 +2071,7 @@ int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
 	bio->bi_bdev = dev->bdev;
 	bio_add_page(bio, page, length, pg_offset);
 
-	if (btrfsic_submit_bio_wait(WRITE_SYNC, bio)) {
+	if (btrfsic_submit_bio_wait(REQ_OP_WRITE, WRITE_SYNC, bio)) {
 		/* try to remap that extent elsewhere? */
 		bio_put(bio);
 		btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS);
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index a39f5d1..9cb6f9a 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1510,7 +1510,7 @@ static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
 		} else {
 			bio->bi_iter.bi_sector = page->physical >> 9;
 
-			if (btrfsic_submit_bio_wait(READ, bio))
+			if (btrfsic_submit_bio_wait(REQ_OP_READ, 0, bio))
 				sblock->no_io_error_seen = 0;
 		}
 
@@ -1644,7 +1644,7 @@ static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
 			return -EIO;
 		}
 
-		if (btrfsic_submit_bio_wait(WRITE, bio)) {
+		if (btrfsic_submit_bio_wait(REQ_OP_WRITE, 0, bio)) {
 			btrfs_dev_stat_inc_and_print(page_bad->dev,
 				BTRFS_DEV_STAT_WRITE_ERRS);
 			btrfs_dev_replace_stats_inc(
@@ -4397,7 +4397,7 @@ leave_with_eio:
 		return -EIO;
 	}
 
-	if (btrfsic_submit_bio_wait(WRITE_SYNC, bio))
+	if (btrfsic_submit_bio_wait(REQ_OP_WRITE, WRITE_SYNC, bio))
 		goto leave_with_eio;
 
 	bio_put(bio);
diff --git a/fs/ext4/crypto.c b/fs/ext4/crypto.c
index 4573155..2782a95 100644
--- a/fs/ext4/crypto.c
+++ b/fs/ext4/crypto.c
@@ -444,7 +444,7 @@ int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex)
 			bio_put(bio);
 			goto errout;
 		}
-		err = submit_bio_wait(WRITE, bio);
+		err = submit_bio_wait(REQ_OP_WRITE, 0, bio);
 		bio_put(bio);
 		if (err)
 			goto errout;
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 78e6d06..7d2972b 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -340,7 +340,7 @@ repeat:
 		fcc->dispatch_list = llist_reverse_order(fcc->dispatch_list);
 
 		bio->bi_bdev = sbi->sb->s_bdev;
-		ret = submit_bio_wait(WRITE_FLUSH, bio);
+		ret = submit_bio_wait(REQ_OP_WRITE, WRITE_FLUSH, bio);
 
 		llist_for_each_entry_safe(cmd, next,
 					  fcc->dispatch_list, llnode) {
@@ -372,7 +372,7 @@ int f2fs_issue_flush(struct f2fs_sb_info *sbi)
 		int ret;
 
 		bio->bi_bdev = sbi->sb->s_bdev;
-		ret = submit_bio_wait(WRITE_FLUSH, bio);
+		ret = submit_bio_wait(REQ_OP_WRITE, WRITE_FLUSH, bio);
 		bio_put(bio);
 		return ret;
 	}
diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index f91a1fa..7288375 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -525,7 +525,7 @@ int hfsplus_compare_dentry(const struct dentry *parent,
 
 /* wrapper.c */
 int hfsplus_submit_bio(struct super_block *sb, sector_t sector, void *buf,
-		       void **data, int rw);
+		       void **data, int op, int flags);
 int hfsplus_read_wrapper(struct super_block *sb);
 
 /* time macros */
diff --git a/fs/hfsplus/part_tbl.c b/fs/hfsplus/part_tbl.c
index eb355d8..63164eb 100644
--- a/fs/hfsplus/part_tbl.c
+++ b/fs/hfsplus/part_tbl.c
@@ -112,7 +112,8 @@ static int hfs_parse_new_pmap(struct super_block *sb, void *buf,
 		if ((u8 *)pm - (u8 *)buf >= buf_size) {
 			res = hfsplus_submit_bio(sb,
 						 *part_start + HFS_PMAP_BLK + i,
-						 buf, (void **)&pm, READ);
+						 buf, (void **)&pm, REQ_OP_READ,
+						 0);
 			if (res)
 				return res;
 		}
@@ -136,7 +137,7 @@ int hfs_part_find(struct super_block *sb,
 		return -ENOMEM;
 
 	res = hfsplus_submit_bio(sb, *part_start + HFS_PMAP_BLK,
-				 buf, &data, READ);
+				 buf, &data, REQ_OP_READ, 0);
 	if (res)
 		goto out;
 
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index 7302d96..f9ea6aa 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -219,7 +219,8 @@ static int hfsplus_sync_fs(struct super_block *sb, int wait)
 
 	error2 = hfsplus_submit_bio(sb,
 				   sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
-				   sbi->s_vhdr_buf, NULL, WRITE_SYNC);
+				   sbi->s_vhdr_buf, NULL, REQ_OP_WRITE,
+				   WRITE_SYNC);
 	if (!error)
 		error = error2;
 	if (!write_backup)
@@ -227,7 +228,8 @@ static int hfsplus_sync_fs(struct super_block *sb, int wait)
 
 	error2 = hfsplus_submit_bio(sb,
 				  sbi->part_start + sbi->sect_count - 2,
-				  sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC);
+				  sbi->s_backup_vhdr_buf, NULL, REQ_OP_WRITE,
+				  WRITE_SYNC);
 	if (!error)
 		error2 = error;
 out:
diff --git a/fs/hfsplus/wrapper.c b/fs/hfsplus/wrapper.c
index cc62356..ac5750b 100644
--- a/fs/hfsplus/wrapper.c
+++ b/fs/hfsplus/wrapper.c
@@ -30,7 +30,8 @@ struct hfsplus_wd {
  * @sector: block to read or write, for blocks of HFSPLUS_SECTOR_SIZE bytes
  * @buf: buffer for I/O
  * @data: output pointer for location of requested data
- * @rw: direction of I/O
+ * @op: direction of I/O
+ * @flags: request op flags
  *
  * The unit of I/O is hfsplus_min_io_size(sb), which may be bigger than
  * HFSPLUS_SECTOR_SIZE, and @buf must be sized accordingly. On reads
@@ -44,7 +45,7 @@ struct hfsplus_wd {
  * will work correctly.
  */
 int hfsplus_submit_bio(struct super_block *sb, sector_t sector,
-		void *buf, void **data, int rw)
+		       void *buf, void **data, int op, int flags)
 {
 	struct bio *bio;
 	int ret = 0;
@@ -66,7 +67,7 @@ int hfsplus_submit_bio(struct super_block *sb, sector_t sector,
 	bio->bi_iter.bi_sector = sector;
 	bio->bi_bdev = sb->s_bdev;
 
-	if (!(rw & WRITE) && data)
+	if (!(op == WRITE) && data)
 		*data = (u8 *)buf + offset;
 
 	while (io_size > 0) {
@@ -83,7 +84,7 @@ int hfsplus_submit_bio(struct super_block *sb, sector_t sector,
 		buf = (u8 *)buf + len;
 	}
 
-	ret = submit_bio_wait(rw, bio);
+	ret = submit_bio_wait(op, flags, bio);
 out:
 	bio_put(bio);
 	return ret < 0 ? ret : 0;
@@ -181,7 +182,7 @@ int hfsplus_read_wrapper(struct super_block *sb)
 reread:
 	error = hfsplus_submit_bio(sb, part_start + HFSPLUS_VOLHEAD_SECTOR,
 				   sbi->s_vhdr_buf, (void **)&sbi->s_vhdr,
-				   READ);
+				   REQ_OP_READ, 0);
 	if (error)
 		goto out_free_backup_vhdr;
 
@@ -213,7 +214,8 @@ reread:
 
 	error = hfsplus_submit_bio(sb, part_start + part_size - 2,
 				   sbi->s_backup_vhdr_buf,
-				   (void **)&sbi->s_backup_vhdr, READ);
+				   (void **)&sbi->s_backup_vhdr, REQ_OP_READ,
+				   0);
 	if (error)
 		goto out_free_backup_vhdr;
 
diff --git a/fs/logfs/dev_bdev.c b/fs/logfs/dev_bdev.c
index a7fdbd8..149c480 100644
--- a/fs/logfs/dev_bdev.c
+++ b/fs/logfs/dev_bdev.c
@@ -30,7 +30,7 @@ static int sync_request(struct page *page, struct block_device *bdev, int rw)
 	bio.bi_iter.bi_sector = page->index * (PAGE_SIZE >> 9);
 	bio.bi_iter.bi_size = PAGE_SIZE;
 
-	return submit_bio_wait(rw, &bio);
+	return submit_bio_wait(rw, 0, &bio);
 }
 
 static int bdev_readpage(void *_sb, struct page *page)
diff --git a/include/linux/bio.h b/include/linux/bio.h
index b9b6e04..7796e0b 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -441,7 +441,7 @@ static inline void bio_io_error(struct bio *bio)
 struct request_queue;
 extern int bio_phys_segments(struct request_queue *, struct bio *);
 
-extern int submit_bio_wait(int rw, struct bio *bio);
+extern int submit_bio_wait(int op, int flags, struct bio *bio);
 extern void bio_advance(struct bio *, unsigned);
 
 extern void bio_init(struct bio *);
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index b2066fb..aa4ca997 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -250,7 +250,7 @@ static void hib_end_io(struct bio *bio)
 	bio_put(bio);
 }
 
-static int hib_submit_io(int rw, pgoff_t page_off, void *addr,
+static int hib_submit_io(int rw, int flags, pgoff_t page_off, void *addr,
 		struct hib_bio_batch *hb)
 {
 	struct page *page = virt_to_page(addr);
@@ -274,7 +274,7 @@ static int hib_submit_io(int rw, pgoff_t page_off, void *addr,
 		atomic_inc(&hb->count);
 		submit_bio(rw, bio);
 	} else {
-		error = submit_bio_wait(rw, bio);
+		error = submit_bio_wait(rw, flags, bio);
 		bio_put(bio);
 	}
 
@@ -295,7 +295,8 @@ static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
 {
 	int error;
 
-	hib_submit_io(READ_SYNC, swsusp_resume_block, swsusp_header, NULL);
+	hib_submit_io(REQ_OP_READ, READ_SYNC, swsusp_resume_block,
+		      swsusp_header, NULL);
 	if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) ||
 	    !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) {
 		memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10);
@@ -304,8 +305,8 @@ static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
 		swsusp_header->flags = flags;
 		if (flags & SF_CRC32_MODE)
 			swsusp_header->crc32 = handle->crc32;
-		error = hib_submit_io(WRITE_SYNC, swsusp_resume_block,
-					swsusp_header, NULL);
+		error = hib_submit_io(REQ_OP_WRITE, WRITE_SYNC,
+				      swsusp_resume_block, swsusp_header, NULL);
 	} else {
 		printk(KERN_ERR "PM: Swap header not found!\n");
 		error = -ENODEV;
@@ -378,7 +379,7 @@ static int write_page(void *buf, sector_t offset, struct hib_bio_batch *hb)
 	} else {
 		src = buf;
 	}
-	return hib_submit_io(WRITE_SYNC, offset, src, hb);
+	return hib_submit_io(REQ_OP_WRITE, WRITE_SYNC, offset, src, hb);
 }
 
 static void release_swap_writer(struct swap_map_handle *handle)
@@ -981,7 +982,8 @@ static int get_swap_reader(struct swap_map_handle *handle,
 			return -ENOMEM;
 		}
 
-		error = hib_submit_io(READ_SYNC, offset, tmp->map, NULL);
+		error = hib_submit_io(REQ_OP_READ, READ_SYNC, offset,
+				      tmp->map, NULL);
 		if (error) {
 			release_swap_reader(handle);
 			return error;
@@ -1005,7 +1007,7 @@ static int swap_read_page(struct swap_map_handle *handle, void *buf,
 	offset = handle->cur->entries[handle->k];
 	if (!offset)
 		return -EFAULT;
-	error = hib_submit_io(READ_SYNC, offset, buf, hb);
+	error = hib_submit_io(REQ_OP_READ, READ_SYNC, offset, buf, hb);
 	if (error)
 		return error;
 	if (++handle->k >= MAP_PAGE_ENTRIES) {
@@ -1507,7 +1509,8 @@ int swsusp_check(void)
 	if (!IS_ERR(hib_resume_bdev)) {
 		set_blocksize(hib_resume_bdev, PAGE_SIZE);
 		clear_page(swsusp_header);
-		error = hib_submit_io(READ_SYNC, swsusp_resume_block,
+		error = hib_submit_io(REQ_OP_READ, READ_SYNC,
+					swsusp_resume_block,
 					swsusp_header, NULL);
 		if (error)
 			goto put;
@@ -1515,7 +1518,8 @@ int swsusp_check(void)
 		if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) {
 			memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10);
 			/* Reset swap signature now */
-			error = hib_submit_io(WRITE_SYNC, swsusp_resume_block,
+			error = hib_submit_io(REQ_OP_WRITE, WRITE_SYNC,
+						swsusp_resume_block,
 						swsusp_header, NULL);
 		} else {
 			error = -EINVAL;
@@ -1559,10 +1563,12 @@ int swsusp_unmark(void)
 {
 	int error;
 
-	hib_submit_io(READ_SYNC, swsusp_resume_block, swsusp_header, NULL);
+	hib_submit_io(REQ_OP_READ, READ_SYNC, swsusp_resume_block,
+		      swsusp_header, NULL);
 	if (!memcmp(HIBERNATE_SIG,swsusp_header->sig, 10)) {
 		memcpy(swsusp_header->sig,swsusp_header->orig_sig, 10);
-		error = hib_submit_io(WRITE_SYNC, swsusp_resume_block,
+		error = hib_submit_io(REQ_OP_WRITE, WRITE_SYNC,
+					swsusp_resume_block,
 					swsusp_header, NULL);
 	} else {
 		printk(KERN_ERR "PM: Cannot find swsusp signature!\n");
-- 
1.8.3.1

[PATCH 03/32] dio/btrfs: prep dio->submit_bio users for bi_rw split.

[mchristi]

From: Mike Christie <mchristi@redhat.com>

Instead of passing around a bitmap of ops and flags, the
next patches separate it into a op field and a flags field.
This patch prepares the dio code and dio->submit_bio users
for the split.

Note that the next patches will fix up the submit_bio() call
with along other users of that function.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 fs/btrfs/inode.c   |  9 ++++-----
 fs/direct-io.c     | 34 +++++++++++++++++++++-------------
 include/linux/fs.h |  4 ++--
 3 files changed, 27 insertions(+), 20 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 611b66d..0ad8bab 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8196,14 +8196,13 @@ out_err:
 	return 0;
 }
 
-static void btrfs_submit_direct(int rw, struct bio *dio_bio,
+static void btrfs_submit_direct(int op, int op_flags, struct bio *dio_bio,
 				struct inode *inode, loff_t file_offset)
 {
 	struct btrfs_dio_private *dip = NULL;
 	struct bio *io_bio = NULL;
 	struct btrfs_io_bio *btrfs_bio;
 	int skip_sum;
-	int write = rw & REQ_WRITE;
 	int ret = 0;
 
 	skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
@@ -8232,14 +8231,14 @@ static void btrfs_submit_direct(int rw, struct bio *dio_bio,
 	btrfs_bio = btrfs_io_bio(io_bio);
 	btrfs_bio->logical = file_offset;
 
-	if (write) {
+	if (op == REQ_OP_WRITE) {
 		io_bio->bi_end_io = btrfs_endio_direct_write;
 	} else {
 		io_bio->bi_end_io = btrfs_endio_direct_read;
 		dip->subio_endio = btrfs_subio_endio_read;
 	}
 
-	ret = btrfs_submit_direct_hook(rw, dip, skip_sum);
+	ret = btrfs_submit_direct_hook(op | op_flags, dip, skip_sum);
 	if (!ret)
 		return;
 
@@ -8267,7 +8266,7 @@ free_ordered:
 		dip = NULL;
 		io_bio = NULL;
 	} else {
-		if (write) {
+		if (op == REQ_OP_WRITE) {
 			struct btrfs_ordered_extent *ordered;
 
 			ordered = btrfs_lookup_ordered_extent(inode,
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 1125629..5e1b1a0 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -108,7 +108,8 @@ struct dio_submit {
 /* dio_state communicated between submission path and end_io */
 struct dio {
 	int flags;			/* doesn't change */
-	int rw;
+	int op;
+	int op_flags;
 	struct inode *inode;
 	loff_t i_size;			/* i_size when submitted */
 	dio_iodone_t *end_io;		/* IO completion function */
@@ -160,7 +161,7 @@ static inline int dio_refill_pages(struct dio *dio, struct dio_submit *sdio)
 	ret = iov_iter_get_pages(sdio->iter, dio->pages, LONG_MAX, DIO_PAGES,
 				&sdio->from);
 
-	if (ret < 0 && sdio->blocks_available && (dio->rw & WRITE)) {
+	if (ret < 0 && sdio->blocks_available && (dio->op == REQ_OP_WRITE)) {
 		struct page *page = ZERO_PAGE(0);
 		/*
 		 * A memory fault, but the filesystem has some outstanding
@@ -239,7 +240,8 @@ static ssize_t dio_complete(struct dio *dio, loff_t offset, ssize_t ret,
 		transferred = dio->result;
 
 		/* Check for short read case */
-		if ((dio->rw == READ) && ((offset + transferred) > dio->i_size))
+		if ((dio->op == REQ_OP_READ) &&
+		    ((offset + transferred) > dio->i_size))
 			transferred = dio->i_size - offset;
 	}
 
@@ -257,7 +259,7 @@ static ssize_t dio_complete(struct dio *dio, loff_t offset, ssize_t ret,
 		inode_dio_end(dio->inode);
 
 	if (is_async) {
-		if (dio->rw & WRITE) {
+		if (dio->op == REQ_OP_WRITE) {
 			int err;
 
 			err = generic_write_sync(dio->iocb->ki_filp, offset,
@@ -393,14 +395,14 @@ static inline void dio_bio_submit(struct dio *dio, struct dio_submit *sdio)
 	dio->refcount++;
 	spin_unlock_irqrestore(&dio->bio_lock, flags);
 
-	if (dio->is_async && dio->rw == READ)
+	if (dio->is_async && dio->op == REQ_OP_READ)
 		bio_set_pages_dirty(bio);
 
 	if (sdio->submit_io)
-		sdio->submit_io(dio->rw, bio, dio->inode,
+		sdio->submit_io(dio->op, dio->op_flags, bio, dio->inode,
 			       sdio->logical_offset_in_bio);
 	else
-		submit_bio(dio->rw, bio);
+		submit_bio(dio->op | dio->op_flags, bio);
 
 	sdio->bio = NULL;
 	sdio->boundary = 0;
@@ -464,14 +466,14 @@ static int dio_bio_complete(struct dio *dio, struct bio *bio)
 	if (bio->bi_error)
 		dio->io_error = -EIO;
 
-	if (dio->is_async && dio->rw == READ) {
+	if (dio->is_async && dio->op == REQ_OP_READ) {
 		bio_check_pages_dirty(bio);	/* transfers ownership */
 		err = bio->bi_error;
 	} else {
 		bio_for_each_segment_all(bvec, bio, i) {
 			struct page *page = bvec->bv_page;
 
-			if (dio->rw == READ && !PageCompound(page))
+			if (dio->op == REQ_OP_READ && !PageCompound(page))
 				set_page_dirty_lock(page);
 			page_cache_release(page);
 		}
@@ -623,7 +625,7 @@ static int get_more_blocks(struct dio *dio, struct dio_submit *sdio,
 		 * which may decide to handle it or also return an unmapped
 		 * buffer head.
 		 */
-		create = dio->rw & WRITE;
+		create = dio->op == REQ_OP_WRITE;
 		if (dio->flags & DIO_SKIP_HOLES) {
 			if (sdio->block_in_file < (i_size_read(dio->inode) >>
 							sdio->blkbits))
@@ -773,7 +775,7 @@ submit_page_section(struct dio *dio, struct dio_submit *sdio, struct page *page,
 {
 	int ret = 0;
 
-	if (dio->rw & WRITE) {
+	if (dio->op == REQ_OP_WRITE) {
 		/*
 		 * Read accounting is performed in submit_bio()
 		 */
@@ -973,7 +975,7 @@ do_holes:
 				loff_t i_size_aligned;
 
 				/* AKPM: eargh, -ENOTBLK is a hack */
-				if (dio->rw & WRITE) {
+				if (dio->op == REQ_OP_WRITE) {
 					page_cache_release(page);
 					return -ENOTBLK;
 				}
@@ -1176,7 +1178,13 @@ do_blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
 		dio->is_async = true;
 
 	dio->inode = inode;
-	dio->rw = iov_iter_rw(iter) == WRITE ? WRITE_ODIRECT : READ;
+	if (iov_iter_rw(iter) == WRITE) {
+		dio->op = REQ_OP_WRITE;
+		dio->op_flags = WRITE_ODIRECT;
+	} else {
+		dio->op = REQ_OP_READ;
+		dio->op_flags = 0;
+	}
 
 	/*
 	 * For AIO O_(D)SYNC writes we need to defer completions to a workqueue
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 72d8a84..601b842 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2678,8 +2678,8 @@ extern int generic_file_open(struct inode * inode, struct file * filp);
 extern int nonseekable_open(struct inode * inode, struct file * filp);
 
 #ifdef CONFIG_BLOCK
-typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode,
-			    loff_t file_offset);
+typedef void (dio_submit_t)(int op, int op_flags, struct bio *bio,
+			    struct inode *inode, loff_t file_offset);
 
 enum {
 	/* need locking between buffered and direct access */
-- 
1.8.3.1

[PATCH 04/32] block: prepare blkdev_issue_discard for bi_rw split

[mchristi]

From: Mike Christie <mchristi@redhat.com>

The next patches will prepare the submit_bio users
for the split. There were a lot more users than
there were for submit_bio_wait, so if the conversion
was not a one liner, I broke it out into its own
patch.

This patch prepares blkdev_issue_discard.

There is some compat code left which will be dropped
in later patches in the series.
1. REQ_WRITE is still being set. This is because a lot
of code assumes it will be set for discard, flushes and
write sames.
2. submit_bio is still taking a bitmap. This is to make
the series git bisectable.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 block/blk-lib.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/block/blk-lib.c b/block/blk-lib.c
index 9ebf653..0861c7a 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -42,7 +42,8 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
 {
 	DECLARE_COMPLETION_ONSTACK(wait);
 	struct request_queue *q = bdev_get_queue(bdev);
-	int type = REQ_WRITE | REQ_DISCARD;
+	int op = REQ_OP_DISCARD;
+	int op_flags = REQ_WRITE;
 	unsigned int granularity;
 	int alignment;
 	struct bio_batch bb;
@@ -63,7 +64,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
 	if (flags & BLKDEV_DISCARD_SECURE) {
 		if (!blk_queue_secdiscard(q))
 			return -EOPNOTSUPP;
-		type |= REQ_SECURE;
+		op_flags |= REQ_SECURE;
 	}
 
 	atomic_set(&bb.done, 1);
@@ -108,7 +109,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
 		sector = end_sect;
 
 		atomic_inc(&bb.done);
-		submit_bio(type, bio);
+		submit_bio(op | op_flags, bio);
 
 		/*
 		 * We can loop for a long time in here, if someone does
-- 
1.8.3.1

[PATCH 05/32] drbd: prepare drbd for bi_rw split

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch prepares drbd's submit_bio use for the next
patches that split bi_rw into a operation and flags field.
Instead of passing in a bitmap with both the operation and
flags mixed in, the callers will now pass them in seperately.

This patch modifies the code related to the submit_bio calls
so the flags and operation are seperated. When this is done
for all code, one of the later patches in the series will
modify the actual submit_bio call, so the patches are bisectable.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 drivers/block/drbd/drbd_actlog.c | 30 ++++++++++++++++--------------
 drivers/block/drbd/drbd_bitmap.c |  4 ++--
 drivers/block/drbd/drbd_int.h    |  2 +-
 drivers/block/drbd/drbd_main.c   |  5 +++--
 4 files changed, 22 insertions(+), 19 deletions(-)

diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index b3868e7..c290e8b 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -137,19 +137,19 @@ void wait_until_done_or_force_detached(struct drbd_device *device, struct drbd_b
 
 static int _drbd_md_sync_page_io(struct drbd_device *device,
 				 struct drbd_backing_dev *bdev,
-				 sector_t sector, int rw)
+				 sector_t sector, int op)
 {
 	struct bio *bio;
 	/* we do all our meta data IO in aligned 4k blocks. */
 	const int size = 4096;
-	int err;
+	int err, op_flags = 0;
 
 	device->md_io.done = 0;
 	device->md_io.error = -ENODEV;
 
-	if ((rw & WRITE) && !test_bit(MD_NO_FUA, &device->flags))
-		rw |= REQ_FUA | REQ_FLUSH;
-	rw |= REQ_SYNC | REQ_NOIDLE;
+	if ((op == REQ_OP_WRITE) && !test_bit(MD_NO_FUA, &device->flags))
+		op_flags |= REQ_FUA | REQ_FLUSH;
+	op_flags |= REQ_SYNC | REQ_NOIDLE;
 
 	bio = bio_alloc_drbd(GFP_NOIO);
 	bio->bi_bdev = bdev->md_bdev;
@@ -159,9 +159,9 @@ static int _drbd_md_sync_page_io(struct drbd_device *device,
 		goto out;
 	bio->bi_private = device;
 	bio->bi_end_io = drbd_md_endio;
-	bio->bi_rw = rw;
+	bio->bi_rw = op | op_flags;
 
-	if (!(rw & WRITE) && device->state.disk == D_DISKLESS && device->ldev == NULL)
+	if (op != REQ_OP_WRITE && device->state.disk == D_DISKLESS && device->ldev == NULL)
 		/* special case, drbd_md_read() during drbd_adm_attach(): no get_ldev */
 		;
 	else if (!get_ldev_if_state(device, D_ATTACHING)) {
@@ -174,10 +174,10 @@ static int _drbd_md_sync_page_io(struct drbd_device *device,
 	bio_get(bio); /* one bio_put() is in the completion handler */
 	atomic_inc(&device->md_io.in_use); /* drbd_md_put_buffer() is in the completion handler */
 	device->md_io.submit_jif = jiffies;
-	if (drbd_insert_fault(device, (rw & WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD))
+	if (drbd_insert_fault(device, (op == REQ_OP_WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD))
 		bio_io_error(bio);
 	else
-		submit_bio(rw, bio);
+		submit_bio(op | op_flags, bio);
 	wait_until_done_or_force_detached(device, bdev, &device->md_io.done);
 	if (!bio->bi_error)
 		err = device->md_io.error;
@@ -188,7 +188,7 @@ static int _drbd_md_sync_page_io(struct drbd_device *device,
 }
 
 int drbd_md_sync_page_io(struct drbd_device *device, struct drbd_backing_dev *bdev,
-			 sector_t sector, int rw)
+			 sector_t sector, int op)
 {
 	int err;
 	D_ASSERT(device, atomic_read(&device->md_io.in_use) == 1);
@@ -197,19 +197,21 @@ int drbd_md_sync_page_io(struct drbd_device *device, struct drbd_backing_dev *bd
 
 	dynamic_drbd_dbg(device, "meta_data io: %s [%d]:%s(,%llus,%s) %pS\n",
 	     current->comm, current->pid, __func__,
-	     (unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ",
+	     (unsigned long long)sector, (op == REQ_OP_WRITE) ? "WRITE" : "READ",
 	     (void*)_RET_IP_ );
 
 	if (sector < drbd_md_first_sector(bdev) ||
 	    sector + 7 > drbd_md_last_sector(bdev))
 		drbd_alert(device, "%s [%d]:%s(,%llus,%s) out of range md access!\n",
 		     current->comm, current->pid, __func__,
-		     (unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ");
+		     (unsigned long long)sector,
+		     (op == REQ_OP_WRITE) ? "WRITE" : "READ");
 
-	err = _drbd_md_sync_page_io(device, bdev, sector, rw);
+	err = _drbd_md_sync_page_io(device, bdev, sector, op);
 	if (err) {
 		drbd_err(device, "drbd_md_sync_page_io(,%llus,%s) failed with error %d\n",
-		    (unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ", err);
+		    (unsigned long long)sector,
+		    (op == REQ_OP_WRITE) ? "WRITE" : "READ", err);
 	}
 	return err;
 }
diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index e5e0f19..7ea1502 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -988,7 +988,7 @@ static void bm_page_io_async(struct drbd_bm_aio_ctx *ctx, int page_nr) __must_ho
 	struct drbd_bitmap *b = device->bitmap;
 	struct page *page;
 	unsigned int len;
-	unsigned int rw = (ctx->flags & BM_AIO_READ) ? READ : WRITE;
+	unsigned int rw = (ctx->flags & BM_AIO_READ) ? REQ_OP_READ : REQ_OP_WRITE;
 
 	sector_t on_disk_sector =
 		device->ldev->md.md_offset + device->ldev->md.bm_offset;
@@ -1020,7 +1020,7 @@ static void bm_page_io_async(struct drbd_bm_aio_ctx *ctx, int page_nr) __must_ho
 	bio->bi_private = ctx;
 	bio->bi_end_io = drbd_bm_endio;
 
-	if (drbd_insert_fault(device, (rw & WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD)) {
+	if (drbd_insert_fault(device, (rw == REQ_OP_WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD)) {
 		bio->bi_rw |= rw;
 		bio_io_error(bio);
 	} else {
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 015c6e9..2934481 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1494,7 +1494,7 @@ extern int drbd_resync_finished(struct drbd_device *device);
 extern void *drbd_md_get_buffer(struct drbd_device *device, const char *intent);
 extern void drbd_md_put_buffer(struct drbd_device *device);
 extern int drbd_md_sync_page_io(struct drbd_device *device,
-		struct drbd_backing_dev *bdev, sector_t sector, int rw);
+		struct drbd_backing_dev *bdev, sector_t sector, int op);
 extern void drbd_ov_out_of_sync_found(struct drbd_device *, sector_t, int);
 extern void wait_until_done_or_force_detached(struct drbd_device *device,
 		struct drbd_backing_dev *bdev, unsigned int *done);
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 74d97f4..9eb8039 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -3080,7 +3080,7 @@ void drbd_md_write(struct drbd_device *device, void *b)
 	D_ASSERT(device, drbd_md_ss(device->ldev) == device->ldev->md.md_offset);
 	sector = device->ldev->md.md_offset;
 
-	if (drbd_md_sync_page_io(device, device->ldev, sector, WRITE)) {
+	if (drbd_md_sync_page_io(device, device->ldev, sector, REQ_OP_WRITE)) {
 		/* this was a try anyways ... */
 		drbd_err(device, "meta data update failed!\n");
 		drbd_chk_io_error(device, 1, DRBD_META_IO_ERROR);
@@ -3278,7 +3278,8 @@ int drbd_md_read(struct drbd_device *device, struct drbd_backing_dev *bdev)
 	bdev->md.meta_dev_idx = bdev->disk_conf->meta_dev_idx;
 	bdev->md.md_offset = drbd_md_ss(bdev);
 
-	if (drbd_md_sync_page_io(device, bdev, bdev->md.md_offset, READ)) {
+	if (drbd_md_sync_page_io(device, bdev, bdev->md.md_offset,
+				 REQ_OP_READ)) {
 		/* NOTE: can't do normal error processing here as this is
 		   called BEFORE disk is attached */
 		drbd_err(device, "Error while reading metadata.\n");
-- 
1.8.3.1

[PATCH 06/32] xen blkback: prepare for bi_rw split

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch prepares xen blkback submit_bio use for the next
patches that split bi_rw into a operation and flags field.
Instead of passing in a bitmap with both the operation and
flags mixed in, the callers will now pass them in seperately.

This patch modifies the code related to the submit_bio calls
so the flags and operation are seperated. When this is done
for all code, one of the later patches in the series will
modify the actual submit_bio call, so the patches are bisectable.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 drivers/block/xen-blkback/blkback.c | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 6a685ae..bfffab3 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -488,7 +488,7 @@ static int xen_vbd_translate(struct phys_req *req, struct xen_blkif *blkif,
 	struct xen_vbd *vbd = &blkif->vbd;
 	int rc = -EACCES;
 
-	if ((operation != READ) && vbd->readonly)
+	if ((operation != REQ_OP_READ) && vbd->readonly)
 		goto out;
 
 	if (likely(req->nr_sects)) {
@@ -990,7 +990,7 @@ static int dispatch_discard_io(struct xen_blkif *blkif,
 	preq.sector_number = req->u.discard.sector_number;
 	preq.nr_sects      = req->u.discard.nr_sectors;
 
-	err = xen_vbd_translate(&preq, blkif, WRITE);
+	err = xen_vbd_translate(&preq, blkif, REQ_OP_WRITE);
 	if (err) {
 		pr_warn("access denied: DISCARD [%llu->%llu] on dev=%04x\n",
 			preq.sector_number,
@@ -1203,6 +1203,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
 	struct bio **biolist = pending_req->biolist;
 	int i, nbio = 0;
 	int operation;
+	int operation_flags = 0;
 	struct blk_plug plug;
 	bool drain = false;
 	struct grant_page **pages = pending_req->segments;
@@ -1220,17 +1221,19 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
 	switch (req_operation) {
 	case BLKIF_OP_READ:
 		blkif->st_rd_req++;
-		operation = READ;
+		operation = REQ_OP_READ;
 		break;
 	case BLKIF_OP_WRITE:
 		blkif->st_wr_req++;
-		operation = WRITE_ODIRECT;
+		operation = REQ_OP_WRITE;
+		operation_flags = WRITE_ODIRECT;
 		break;
 	case BLKIF_OP_WRITE_BARRIER:
 		drain = true;
 	case BLKIF_OP_FLUSH_DISKCACHE:
 		blkif->st_f_req++;
-		operation = WRITE_FLUSH;
+		operation = REQ_OP_WRITE;
+		operation_flags = WRITE_FLUSH;
 		break;
 	default:
 		operation = 0; /* make gcc happy */
@@ -1242,7 +1245,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
 	nseg = req->operation == BLKIF_OP_INDIRECT ?
 	       req->u.indirect.nr_segments : req->u.rw.nr_segments;
 
-	if (unlikely(nseg == 0 && operation != WRITE_FLUSH) ||
+	if (unlikely(nseg == 0 && operation_flags != WRITE_FLUSH) ||
 	    unlikely((req->operation != BLKIF_OP_INDIRECT) &&
 		     (nseg > BLKIF_MAX_SEGMENTS_PER_REQUEST)) ||
 	    unlikely((req->operation == BLKIF_OP_INDIRECT) &&
@@ -1349,7 +1352,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
 
 	/* This will be hit if the operation was a flush or discard. */
 	if (!bio) {
-		BUG_ON(operation != WRITE_FLUSH);
+		BUG_ON(operation_flags != WRITE_FLUSH);
 
 		bio = bio_alloc(GFP_KERNEL, 0);
 		if (unlikely(bio == NULL))
@@ -1365,14 +1368,14 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
 	blk_start_plug(&plug);
 
 	for (i = 0; i < nbio; i++)
-		submit_bio(operation, biolist[i]);
+		submit_bio(operation | operation_flags, biolist[i]);
 
 	/* Let the I/Os go.. */
 	blk_finish_plug(&plug);
 
-	if (operation == READ)
+	if (operation == REQ_OP_READ)
 		blkif->st_rd_sect += preq.nr_sects;
-	else if (operation & WRITE)
+	else if (operation == REQ_OP_WRITE)
 		blkif->st_wr_sect += preq.nr_sects;
 
 	return 0;
-- 
1.8.3.1

[PATCH 07/32] dm: prepare for bi_rw split

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch prepares dm's submit_bio use for the next
patches that split bi_rw into a operation and flags field.
Instead of passing in a bitmap with both the operation and
flags mixed in, the callers will now pass them in seperately.

This patch modifies the code related to the submit_bio calls
so the flags and operation are seperated. When this is done
for all code, one of the later patches in the series will
the actual submit_bio call, so the patches are bisectable.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 drivers/md/dm-bufio.c           |  6 +++--
 drivers/md/dm-io.c              | 56 ++++++++++++++++++++++-------------------
 drivers/md/dm-kcopyd.c          |  3 ++-
 drivers/md/dm-log.c             |  5 ++--
 drivers/md/dm-raid1.c           | 11 +++++---
 drivers/md/dm-snap-persistent.c | 24 ++++++++++--------
 drivers/md/dm-thin.c            |  6 ++---
 include/linux/dm-io.h           |  3 ++-
 8 files changed, 64 insertions(+), 50 deletions(-)

diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index 83cc52e..9d5ef0c 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -554,7 +554,8 @@ static void use_dmio(struct dm_buffer *b, int rw, sector_t block,
 {
 	int r;
 	struct dm_io_request io_req = {
-		.bi_rw = rw,
+		.bi_op = rw,
+		.bi_op_flags = 0,
 		.notify.fn = dmio_complete,
 		.notify.context = b,
 		.client = b->c->dm_io,
@@ -1302,7 +1303,8 @@ EXPORT_SYMBOL_GPL(dm_bufio_write_dirty_buffers);
 int dm_bufio_issue_flush(struct dm_bufio_client *c)
 {
 	struct dm_io_request io_req = {
-		.bi_rw = WRITE_FLUSH,
+		.bi_op = REQ_OP_WRITE,
+		.bi_op_flags = WRITE_FLUSH,
 		.mem.type = DM_IO_KMEM,
 		.mem.ptr.addr = NULL,
 		.client = c->dm_io,
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index 6f8e83b2..6479096 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -279,8 +279,9 @@ static void km_dp_init(struct dpages *dp, void *data)
 /*-----------------------------------------------------------------
  * IO routines that accept a list of pages.
  *---------------------------------------------------------------*/
-static void do_region(int rw, unsigned region, struct dm_io_region *where,
-		      struct dpages *dp, struct io *io)
+static void do_region(int op, int op_flags, unsigned region,
+		      struct dm_io_region *where, struct dpages *dp,
+		      struct io *io)
 {
 	struct bio *bio;
 	struct page *page;
@@ -296,24 +297,25 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where,
 	/*
 	 * Reject unsupported discard and write same requests.
 	 */
-	if (rw & REQ_DISCARD)
+	if (op == REQ_DISCARD)
 		special_cmd_max_sectors = q->limits.max_discard_sectors;
-	else if (rw & REQ_WRITE_SAME)
+	else if (op == REQ_WRITE_SAME)
 		special_cmd_max_sectors = q->limits.max_write_same_sectors;
-	if ((rw & (REQ_DISCARD | REQ_WRITE_SAME)) && special_cmd_max_sectors == 0) {
+	if ((op == REQ_DISCARD || op == REQ_WRITE_SAME) &&
+	    special_cmd_max_sectors == 0) {
 		dec_count(io, region, -EOPNOTSUPP);
 		return;
 	}
 
 	/*
-	 * where->count may be zero if rw holds a flush and we need to
+	 * where->count may be zero if op holds a flush and we need to
 	 * send a zero-sized flush.
 	 */
 	do {
 		/*
 		 * Allocate a suitably sized-bio.
 		 */
-		if ((rw & REQ_DISCARD) || (rw & REQ_WRITE_SAME))
+		if ((op == REQ_DISCARD) || (op == REQ_WRITE_SAME))
 			num_bvecs = 1;
 		else
 			num_bvecs = min_t(int, BIO_MAX_PAGES,
@@ -325,11 +327,11 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where,
 		bio->bi_end_io = endio;
 		store_io_and_region_in_bio(bio, io, region);
 
-		if (rw & REQ_DISCARD) {
+		if (op == REQ_DISCARD) {
 			num_sectors = min_t(sector_t, special_cmd_max_sectors, remaining);
 			bio->bi_iter.bi_size = num_sectors << SECTOR_SHIFT;
 			remaining -= num_sectors;
-		} else if (rw & REQ_WRITE_SAME) {
+		} else if (op == REQ_WRITE_SAME) {
 			/*
 			 * WRITE SAME only uses a single page.
 			 */
@@ -356,11 +358,11 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where,
 		}
 
 		atomic_inc(&io->count);
-		submit_bio(rw, bio);
+		submit_bio(op | op_flags, bio);
 	} while (remaining);
 }
 
-static void dispatch_io(int rw, unsigned int num_regions,
+static void dispatch_io(int op, int op_flags, unsigned int num_regions,
 			struct dm_io_region *where, struct dpages *dp,
 			struct io *io, int sync)
 {
@@ -370,7 +372,7 @@ static void dispatch_io(int rw, unsigned int num_regions,
 	BUG_ON(num_regions > DM_IO_MAX_REGIONS);
 
 	if (sync)
-		rw |= REQ_SYNC;
+		op_flags |= REQ_SYNC;
 
 	/*
 	 * For multiple regions we need to be careful to rewind
@@ -378,8 +380,8 @@ static void dispatch_io(int rw, unsigned int num_regions,
 	 */
 	for (i = 0; i < num_regions; i++) {
 		*dp = old_pages;
-		if (where[i].count || (rw & REQ_FLUSH))
-			do_region(rw, i, where + i, dp, io);
+		if (where[i].count || (op_flags & REQ_FLUSH))
+			do_region(op, op_flags, i, where + i, dp, io);
 	}
 
 	/*
@@ -403,13 +405,13 @@ static void sync_io_complete(unsigned long error, void *context)
 }
 
 static int sync_io(struct dm_io_client *client, unsigned int num_regions,
-		   struct dm_io_region *where, int rw, struct dpages *dp,
-		   unsigned long *error_bits)
+		   struct dm_io_region *where, int op, int op_flags,
+		   struct dpages *dp, unsigned long *error_bits)
 {
 	struct io *io;
 	struct sync_io sio;
 
-	if (num_regions > 1 && (rw & RW_MASK) != WRITE) {
+	if (num_regions > 1 && op != WRITE) {
 		WARN_ON(1);
 		return -EIO;
 	}
@@ -426,7 +428,7 @@ static int sync_io(struct dm_io_client *client, unsigned int num_regions,
 	io->vma_invalidate_address = dp->vma_invalidate_address;
 	io->vma_invalidate_size = dp->vma_invalidate_size;
 
-	dispatch_io(rw, num_regions, where, dp, io, 1);
+	dispatch_io(op, op_flags, num_regions, where, dp, io, 1);
 
 	wait_for_completion_io(&sio.wait);
 
@@ -437,12 +439,12 @@ static int sync_io(struct dm_io_client *client, unsigned int num_regions,
 }
 
 static int async_io(struct dm_io_client *client, unsigned int num_regions,
-		    struct dm_io_region *where, int rw, struct dpages *dp,
-		    io_notify_fn fn, void *context)
+		    struct dm_io_region *where, int op, int op_flags,
+		    struct dpages *dp, io_notify_fn fn, void *context)
 {
 	struct io *io;
 
-	if (num_regions > 1 && (rw & RW_MASK) != WRITE) {
+	if (num_regions > 1 && op != WRITE) {
 		WARN_ON(1);
 		fn(1, context);
 		return -EIO;
@@ -458,7 +460,7 @@ static int async_io(struct dm_io_client *client, unsigned int num_regions,
 	io->vma_invalidate_address = dp->vma_invalidate_address;
 	io->vma_invalidate_size = dp->vma_invalidate_size;
 
-	dispatch_io(rw, num_regions, where, dp, io, 0);
+	dispatch_io(op, op_flags, num_regions, where, dp, io, 0);
 	return 0;
 }
 
@@ -481,7 +483,7 @@ static int dp_init(struct dm_io_request *io_req, struct dpages *dp,
 
 	case DM_IO_VMA:
 		flush_kernel_vmap_range(io_req->mem.ptr.vma, size);
-		if ((io_req->bi_rw & RW_MASK) == READ) {
+		if (io_req->bi_op == READ) {
 			dp->vma_invalidate_address = io_req->mem.ptr.vma;
 			dp->vma_invalidate_size = size;
 		}
@@ -519,10 +521,12 @@ int dm_io(struct dm_io_request *io_req, unsigned num_regions,
 
 	if (!io_req->notify.fn)
 		return sync_io(io_req->client, num_regions, where,
-			       io_req->bi_rw, &dp, sync_error_bits);
+			       io_req->bi_op, io_req->bi_op_flags, &dp,
+			       sync_error_bits);
 
-	return async_io(io_req->client, num_regions, where, io_req->bi_rw,
-			&dp, io_req->notify.fn, io_req->notify.context);
+	return async_io(io_req->client, num_regions, where, io_req->bi_op,
+			io_req->bi_op_flags, &dp, io_req->notify.fn,
+			io_req->notify.context);
 }
 EXPORT_SYMBOL(dm_io);
 
diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c
index 3a7cade..02dccbe 100644
--- a/drivers/md/dm-kcopyd.c
+++ b/drivers/md/dm-kcopyd.c
@@ -496,7 +496,8 @@ static int run_io_job(struct kcopyd_job *job)
 {
 	int r;
 	struct dm_io_request io_req = {
-		.bi_rw = job->rw,
+		.bi_op = job->rw,
+		.bi_op_flags = 0,
 		.mem.type = DM_IO_PAGE_LIST,
 		.mem.ptr.pl = job->pages,
 		.mem.offset = 0,
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 627d191..4ca2d1d 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -293,7 +293,7 @@ static void header_from_disk(struct log_header_core *core, struct log_header_dis
 
 static int rw_header(struct log_c *lc, int rw)
 {
-	lc->io_req.bi_rw = rw;
+	lc->io_req.bi_op = rw;
 
 	return dm_io(&lc->io_req, 1, &lc->header_location, NULL);
 }
@@ -306,7 +306,8 @@ static int flush_header(struct log_c *lc)
 		.count = 0,
 	};
 
-	lc->io_req.bi_rw = WRITE_FLUSH;
+	lc->io_req.bi_op = REQ_OP_WRITE;
+	lc->io_req.bi_op_flags = WRITE_FLUSH;
 
 	return dm_io(&lc->io_req, 1, &null_location, NULL);
 }
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index f2a363a..ec48487 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -260,7 +260,8 @@ static int mirror_flush(struct dm_target *ti)
 	struct dm_io_region io[ms->nr_mirrors];
 	struct mirror *m;
 	struct dm_io_request io_req = {
-		.bi_rw = WRITE_FLUSH,
+		.bi_op = REQ_OP_WRITE,
+		.bi_op_flags = WRITE_FLUSH,
 		.mem.type = DM_IO_KMEM,
 		.mem.ptr.addr = NULL,
 		.client = ms->io_client,
@@ -541,7 +542,8 @@ static void read_async_bio(struct mirror *m, struct bio *bio)
 {
 	struct dm_io_region io;
 	struct dm_io_request io_req = {
-		.bi_rw = READ,
+		.bi_op = REQ_OP_READ,
+		.bi_op_flags = 0,
 		.mem.type = DM_IO_BIO,
 		.mem.ptr.bio = bio,
 		.notify.fn = read_callback,
@@ -654,7 +656,8 @@ static void do_write(struct mirror_set *ms, struct bio *bio)
 	struct dm_io_region io[ms->nr_mirrors], *dest = io;
 	struct mirror *m;
 	struct dm_io_request io_req = {
-		.bi_rw = WRITE | (bio->bi_rw & WRITE_FLUSH_FUA),
+		.bi_op = REQ_OP_WRITE,
+		.bi_op_flags = bio->bi_rw & WRITE_FLUSH_FUA,
 		.mem.type = DM_IO_BIO,
 		.mem.ptr.bio = bio,
 		.notify.fn = write_callback,
@@ -663,7 +666,7 @@ static void do_write(struct mirror_set *ms, struct bio *bio)
 	};
 
 	if (bio->bi_rw & REQ_DISCARD) {
-		io_req.bi_rw |= REQ_DISCARD;
+		io_req.bi_op_flags |= REQ_DISCARD;
 		io_req.mem.type = DM_IO_KMEM;
 		io_req.mem.ptr.addr = NULL;
 	}
diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c
index 117a05e..1032fcb 100644
--- a/drivers/md/dm-snap-persistent.c
+++ b/drivers/md/dm-snap-persistent.c
@@ -226,8 +226,8 @@ static void do_metadata(struct work_struct *work)
 /*
  * Read or write a chunk aligned and sized block of data from a device.
  */
-static int chunk_io(struct pstore *ps, void *area, chunk_t chunk, int rw,
-		    int metadata)
+static int chunk_io(struct pstore *ps, void *area, chunk_t chunk, int op,
+		    int op_flags, int metadata)
 {
 	struct dm_io_region where = {
 		.bdev = dm_snap_cow(ps->store->snap)->bdev,
@@ -235,7 +235,8 @@ static int chunk_io(struct pstore *ps, void *area, chunk_t chunk, int rw,
 		.count = ps->store->chunk_size,
 	};
 	struct dm_io_request io_req = {
-		.bi_rw = rw,
+		.bi_op = op,
+		.bi_op_flags = op_flags,
 		.mem.type = DM_IO_VMA,
 		.mem.ptr.vma = area,
 		.client = ps->io_client,
@@ -281,14 +282,14 @@ static void skip_metadata(struct pstore *ps)
  * Read or write a metadata area.  Remembering to skip the first
  * chunk which holds the header.
  */
-static int area_io(struct pstore *ps, int rw)
+static int area_io(struct pstore *ps, int op, int op_flags)
 {
 	int r;
 	chunk_t chunk;
 
 	chunk = area_location(ps, ps->current_area);
 
-	r = chunk_io(ps, ps->area, chunk, rw, 0);
+	r = chunk_io(ps, ps->area, chunk, op, op_flags, 0);
 	if (r)
 		return r;
 
@@ -302,7 +303,8 @@ static void zero_memory_area(struct pstore *ps)
 
 static int zero_disk_area(struct pstore *ps, chunk_t area)
 {
-	return chunk_io(ps, ps->zero_area, area_location(ps, area), WRITE, 0);
+	return chunk_io(ps, ps->zero_area, area_location(ps, area), WRITE, 0,
+			0);
 }
 
 static int read_header(struct pstore *ps, int *new_snapshot)
@@ -334,7 +336,7 @@ static int read_header(struct pstore *ps, int *new_snapshot)
 	if (r)
 		return r;
 
-	r = chunk_io(ps, ps->header_area, 0, READ, 1);
+	r = chunk_io(ps, ps->header_area, 0, READ, 0, 1);
 	if (r)
 		goto bad;
 
@@ -395,7 +397,7 @@ static int write_header(struct pstore *ps)
 	dh->version = cpu_to_le32(ps->version);
 	dh->chunk_size = cpu_to_le32(ps->store->chunk_size);
 
-	return chunk_io(ps, ps->header_area, 0, WRITE, 1);
+	return chunk_io(ps, ps->header_area, 0, WRITE, 0, 1);
 }
 
 /*
@@ -736,7 +738,7 @@ static void persistent_commit_exception(struct dm_exception_store *store,
 	/*
 	 * Commit exceptions to disk.
 	 */
-	if (ps->valid && area_io(ps, WRITE_FLUSH_FUA))
+	if (ps->valid && area_io(ps, REQ_OP_WRITE, WRITE_FLUSH_FUA))
 		ps->valid = 0;
 
 	/*
@@ -776,7 +778,7 @@ static int persistent_prepare_merge(struct dm_exception_store *store,
 			return 0;
 
 		ps->current_area--;
-		r = area_io(ps, READ);
+		r = area_io(ps, REQ_OP_READ, 0);
 		if (r < 0)
 			return r;
 		ps->current_committed = ps->exceptions_per_area;
@@ -813,7 +815,7 @@ static int persistent_commit_merge(struct dm_exception_store *store,
 	for (i = 0; i < nr_merged; i++)
 		clear_exception(ps, ps->current_committed - 1 - i);
 
-	r = area_io(ps, WRITE_FLUSH_FUA);
+	r = area_io(ps, REQ_OP_WRITE, WRITE_FLUSH_FUA);
 	if (r < 0)
 		return r;
 
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 3897b90..1500582 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -338,7 +338,7 @@ static int __blkdev_issue_discard_async(struct block_device *bdev, sector_t sect
 					struct bio *parent_bio)
 {
 	struct request_queue *q = bdev_get_queue(bdev);
-	int type = REQ_WRITE | REQ_DISCARD;
+	int op_flags = 0;
 	struct bio *bio;
 
 	if (!q || !nr_sects)
@@ -350,7 +350,7 @@ static int __blkdev_issue_discard_async(struct block_device *bdev, sector_t sect
 	if (flags & BLKDEV_DISCARD_SECURE) {
 		if (!blk_queue_secdiscard(q))
 			return -EOPNOTSUPP;
-		type |= REQ_SECURE;
+		op_flags |= REQ_SECURE;
 	}
 
 	/*
@@ -366,7 +366,7 @@ static int __blkdev_issue_discard_async(struct block_device *bdev, sector_t sect
 	bio->bi_bdev = bdev;
 	bio->bi_iter.bi_size = nr_sects << 9;
 
-	submit_bio(type, bio);
+	submit_bio(REQ_OP_DISCARD | op_flags, bio);
 
 	return 0;
 }
diff --git a/include/linux/dm-io.h b/include/linux/dm-io.h
index a68cbe5..b91b023 100644
--- a/include/linux/dm-io.h
+++ b/include/linux/dm-io.h
@@ -57,7 +57,8 @@ struct dm_io_notify {
  */
 struct dm_io_client;
 struct dm_io_request {
-	int bi_rw;			/* READ|WRITE - not READA */
+	int bi_op;			/* REQ_OP */
+	int bi_op_flags;		/* rq_flag_bits */
 	struct dm_io_memory mem;	/* Memory to use for io */
 	struct dm_io_notify notify;	/* Synchronous if notify.fn is NULL */
 	struct dm_io_client *client;	/* Client memory handler */
-- 
1.8.3.1

[PATCH 08/32] target: prepare for bi_rw split

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch prepares lio's submit_bio use for the next
patches that split bi_rw into a operation and flags field.
Instead of passing in a bitmap with both the operation and
flags mixed in, the callers will now pass them in seperately.

This patch modifies the code related to the submit_bio calls
so the flags and operation are seperated. When this is done
for all code, one of the later patches in the series will
the actual submit_bio call, so the patches are bisectable.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 drivers/target/target_core_iblock.c | 32 ++++++++++++++++++--------------
 1 file changed, 18 insertions(+), 14 deletions(-)

diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index 0f19e11..25f75ab 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -354,14 +354,14 @@ iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num)
 	return bio;
 }
 
-static void iblock_submit_bios(struct bio_list *list, int rw)
+static void iblock_submit_bios(struct bio_list *list, int op, int op_flags)
 {
 	struct blk_plug plug;
 	struct bio *bio;
 
 	blk_start_plug(&plug);
 	while ((bio = bio_list_pop(list)))
-		submit_bio(rw, bio);
+		submit_bio(op | op_flags, bio);
 	blk_finish_plug(&plug);
 }
 
@@ -480,7 +480,7 @@ iblock_execute_write_same(struct se_cmd *cmd)
 		sectors -= 1;
 	}
 
-	iblock_submit_bios(&list, WRITE);
+	iblock_submit_bios(&list, REQ_OP_WRITE, 0);
 	return 0;
 
 fail_put_bios:
@@ -653,7 +653,8 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
 	u32 sg_num = sgl_nents;
 	sector_t block_lba;
 	unsigned bio_cnt;
-	int rw = 0;
+	int op_flags = 0;
+	int op = 0;
 	int i;
 
 	if (data_direction == DMA_TO_DEVICE) {
@@ -664,17 +665,20 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
 		 * is not enabled, or if initiator set the Force Unit Access bit.
 		 */
 		if (q->flush_flags & REQ_FUA) {
-			if (cmd->se_cmd_flags & SCF_FUA)
-				rw = WRITE_FUA;
-			else if (!(q->flush_flags & REQ_FLUSH))
-				rw = WRITE_FUA;
-			else
-				rw = WRITE;
+			if (cmd->se_cmd_flags & SCF_FUA) {
+				op = REQ_OP_WRITE;
+				op_flags = WRITE_FUA;
+			} else if (!(q->flush_flags & REQ_FLUSH)) {
+				op = REQ_OP_WRITE;
+				op_flags = WRITE_FUA;
+			} else {
+				op = REQ_OP_WRITE;
+			}
 		} else {
-			rw = WRITE;
+			op = REQ_OP_WRITE;
 		}
 	} else {
-		rw = READ;
+		op = REQ_OP_READ;
 	}
 
 	/*
@@ -726,7 +730,7 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
 		while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
 				!= sg->length) {
 			if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) {
-				iblock_submit_bios(&list, rw);
+				iblock_submit_bios(&list, op, op_flags);
 				bio_cnt = 0;
 			}
 
@@ -750,7 +754,7 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
 			goto fail_put_bios;
 	}
 
-	iblock_submit_bios(&list, rw);
+	iblock_submit_bios(&list, op, op_flags);
 	iblock_complete_cmd(cmd);
 	return 0;
 
-- 
1.8.3.1

[PATCH 09/32] btrfs: prepare for bi_rw split

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch prepares btrfs's submit_bio use for the next
patches that split bi_rw into a operation and flags field.
Instead of passing in a bitmap with both the operation and
flags mixed in, the callers will now pass them in seperately.

This patch modifies the code related to the submit_bio calls
so the flags and operation are seperated. When this is done
for all code, one of the later patches in the series will
the actual submit_bio call, so the patches are bisectable.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 fs/btrfs/check-integrity.c |   6 +--
 fs/btrfs/check-integrity.h |   2 +-
 fs/btrfs/compression.c     |   8 ++--
 fs/btrfs/ctree.h           |   3 +-
 fs/btrfs/disk-io.c         |  48 +++++++++++----------
 fs/btrfs/disk-io.h         |   2 +-
 fs/btrfs/extent-tree.c     |   2 +-
 fs/btrfs/extent_io.c       | 103 ++++++++++++++++++++++++---------------------
 fs/btrfs/extent_io.h       |   7 +--
 fs/btrfs/inode.c           |  65 ++++++++++++++--------------
 fs/btrfs/scrub.c           |   4 +-
 fs/btrfs/volumes.c         |  88 ++++++++++++++++++++------------------
 fs/btrfs/volumes.h         |   4 +-
 13 files changed, 177 insertions(+), 165 deletions(-)

diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
index fd50b2f..515a92e 100644
--- a/fs/btrfs/check-integrity.c
+++ b/fs/btrfs/check-integrity.c
@@ -3058,10 +3058,10 @@ leave:
 	mutex_unlock(&btrfsic_mutex);
 }
 
-void btrfsic_submit_bio(int rw, struct bio *bio)
+void btrfsic_submit_bio(int op, int op_flags, struct bio *bio)
 {
-	__btrfsic_submit_bio(rw, bio);
-	submit_bio(rw, bio);
+	__btrfsic_submit_bio(op | op_flags, bio);
+	submit_bio(op | op_flags, bio);
 }
 
 int btrfsic_submit_bio_wait(int op, int op_flags, struct bio *bio)
diff --git a/fs/btrfs/check-integrity.h b/fs/btrfs/check-integrity.h
index 13b0d54..a8edc424 100644
--- a/fs/btrfs/check-integrity.h
+++ b/fs/btrfs/check-integrity.h
@@ -21,7 +21,7 @@
 
 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
 int btrfsic_submit_bh(int rw, struct buffer_head *bh);
-void btrfsic_submit_bio(int rw, struct bio *bio);
+void btrfsic_submit_bio(int op, int op_flags, struct bio *bio);
 int btrfsic_submit_bio_wait(int op, int op_flags, struct bio *bio);
 #else
 #define btrfsic_submit_bh submit_bh
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 57ee8ca..a7b245d 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -401,7 +401,7 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
 				BUG_ON(ret); /* -ENOMEM */
 			}
 
-			ret = btrfs_map_bio(root, WRITE, bio, 0, 1);
+			ret = btrfs_map_bio(root, REQ_OP_WRITE, 0, bio, 0, 1);
 			BUG_ON(ret); /* -ENOMEM */
 
 			bio_put(bio);
@@ -431,7 +431,7 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
 		BUG_ON(ret); /* -ENOMEM */
 	}
 
-	ret = btrfs_map_bio(root, WRITE, bio, 0, 1);
+	ret = btrfs_map_bio(root, REQ_OP_WRITE, 0, bio, 0, 1);
 	BUG_ON(ret); /* -ENOMEM */
 
 	bio_put(bio);
@@ -692,7 +692,7 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
 			sums += DIV_ROUND_UP(comp_bio->bi_iter.bi_size,
 					     root->sectorsize);
 
-			ret = btrfs_map_bio(root, READ, comp_bio,
+			ret = btrfs_map_bio(root, REQ_OP_READ, 0, comp_bio,
 					    mirror_num, 0);
 			if (ret) {
 				bio->bi_error = ret;
@@ -722,7 +722,7 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
 		BUG_ON(ret); /* -ENOMEM */
 	}
 
-	ret = btrfs_map_bio(root, READ, comp_bio, mirror_num, 0);
+	ret = btrfs_map_bio(root, REQ_OP_READ, 0, comp_bio, mirror_num, 0);
 	if (ret) {
 		bio->bi_error = ret;
 		bio_endio(comp_bio);
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 938efe3..e4489dd1 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3910,8 +3910,7 @@ int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
 			     struct btrfs_root *parent_root,
 			     u64 new_dirid);
 int btrfs_merge_bio_hook(int rw, struct page *page, unsigned long offset,
-			 size_t size, struct bio *bio,
-			 unsigned long bio_flags);
+			 size_t size, struct bio *bio, unsigned long bio_flags);
 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
 int btrfs_readpage(struct file *file, struct page *page);
 void btrfs_evict_inode(struct inode *inode);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 1e60d00..6c17d5d 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -118,7 +118,8 @@ struct async_submit_bio {
 	struct list_head list;
 	extent_submit_bio_hook_t *submit_bio_start;
 	extent_submit_bio_hook_t *submit_bio_done;
-	int rw;
+	int op;
+	int op_flags;
 	int mirror_num;
 	unsigned long bio_flags;
 	/*
@@ -783,9 +784,9 @@ static void run_one_async_start(struct btrfs_work *work)
 	int ret;
 
 	async = container_of(work, struct  async_submit_bio, work);
-	ret = async->submit_bio_start(async->inode, async->rw, async->bio,
-				      async->mirror_num, async->bio_flags,
-				      async->bio_offset);
+	ret = async->submit_bio_start(async->inode, async->op, async->op_flags,
+				      async->bio, async->mirror_num,
+				      async->bio_flags, async->bio_offset);
 	if (ret)
 		async->error = ret;
 }
@@ -813,8 +814,8 @@ static void run_one_async_done(struct btrfs_work *work)
 		return;
 	}
 
-	async->submit_bio_done(async->inode, async->rw, async->bio,
-			       async->mirror_num, async->bio_flags,
+	async->submit_bio_done(async->inode, async->op, async->op_flags,
+			       async->bio, async->mirror_num, async->bio_flags,
 			       async->bio_offset);
 }
 
@@ -827,7 +828,7 @@ static void run_one_async_free(struct btrfs_work *work)
 }
 
 int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
-			int rw, struct bio *bio, int mirror_num,
+			int op, int op_flags, struct bio *bio, int mirror_num,
 			unsigned long bio_flags,
 			u64 bio_offset,
 			extent_submit_bio_hook_t *submit_bio_start,
@@ -840,7 +841,8 @@ int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
 		return -ENOMEM;
 
 	async->inode = inode;
-	async->rw = rw;
+	async->op = op;
+	async->op_flags = op_flags;
 	async->bio = bio;
 	async->mirror_num = mirror_num;
 	async->submit_bio_start = submit_bio_start;
@@ -856,7 +858,7 @@ int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
 
 	atomic_inc(&fs_info->nr_async_submits);
 
-	if (rw & REQ_SYNC)
+	if (op_flags & REQ_SYNC)
 		btrfs_set_work_high_priority(&async->work);
 
 	btrfs_queue_work(fs_info->workers, &async->work);
@@ -886,7 +888,7 @@ static int btree_csum_one_bio(struct bio *bio)
 	return ret;
 }
 
-static int __btree_submit_bio_start(struct inode *inode, int rw,
+static int __btree_submit_bio_start(struct inode *inode, int op, int op_flags,
 				    struct bio *bio, int mirror_num,
 				    unsigned long bio_flags,
 				    u64 bio_offset)
@@ -898,9 +900,9 @@ static int __btree_submit_bio_start(struct inode *inode, int rw,
 	return btree_csum_one_bio(bio);
 }
 
-static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
-				 int mirror_num, unsigned long bio_flags,
-				 u64 bio_offset)
+static int __btree_submit_bio_done(struct inode *inode, int op, int op_flags,
+				   struct bio *bio, int mirror_num,
+				   unsigned long bio_flags, u64 bio_offset)
 {
 	int ret;
 
@@ -908,7 +910,7 @@ static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
 	 * when we're called for a write, we're already in the async
 	 * submission context.  Just jump into btrfs_map_bio
 	 */
-	ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1);
+	ret = btrfs_map_bio(BTRFS_I(inode)->root, op, op_flags, bio, mirror_num, 1);
 	if (ret) {
 		bio->bi_error = ret;
 		bio_endio(bio);
@@ -927,14 +929,14 @@ static int check_async_write(struct inode *inode, unsigned long bio_flags)
 	return 1;
 }
 
-static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
-				 int mirror_num, unsigned long bio_flags,
-				 u64 bio_offset)
+static int btree_submit_bio_hook(struct inode *inode, int op, int op_flags,
+				 struct bio *bio, int mirror_num,
+				 unsigned long bio_flags, u64 bio_offset)
 {
 	int async = check_async_write(inode, bio_flags);
 	int ret;
 
-	if (!(rw & REQ_WRITE)) {
+	if (!(op == REQ_OP_WRITE)) {
 		/*
 		 * called for a read, do the setup so that checksum validation
 		 * can happen in the async kernel threads
@@ -943,13 +945,13 @@ static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
 					  bio, BTRFS_WQ_ENDIO_METADATA);
 		if (ret)
 			goto out_w_error;
-		ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
+		ret = btrfs_map_bio(BTRFS_I(inode)->root, op, op_flags, bio,
 				    mirror_num, 0);
 	} else if (!async) {
 		ret = btree_csum_one_bio(bio);
 		if (ret)
 			goto out_w_error;
-		ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
+		ret = btrfs_map_bio(BTRFS_I(inode)->root, op, op_flags, bio,
 				    mirror_num, 0);
 	} else {
 		/*
@@ -957,8 +959,8 @@ static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
 		 * checksumming can happen in parallel across all CPUs
 		 */
 		ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
-					  inode, rw, bio, mirror_num, 0,
-					  bio_offset,
+					  inode, op, op_flags, bio, mirror_num,
+					  0, bio_offset,
 					  __btree_submit_bio_start,
 					  __btree_submit_bio_done);
 	}
@@ -3392,7 +3394,7 @@ static int write_dev_flush(struct btrfs_device *device, int wait)
 	device->flush_bio = bio;
 
 	bio_get(bio);
-	btrfsic_submit_bio(WRITE_FLUSH, bio);
+	btrfsic_submit_bio(REQ_OP_WRITE, WRITE_FLUSH, bio);
 
 	return 0;
 }
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index bdfb479..caa47a3 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -121,7 +121,7 @@ void btrfs_csum_final(u32 crc, char *result);
 int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
 			enum btrfs_wq_endio_type metadata);
 int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
-			int rw, struct bio *bio, int mirror_num,
+			int op, int op_flags, struct bio *bio, int mirror_num,
 			unsigned long bio_flags, u64 bio_offset,
 			extent_submit_bio_hook_t *submit_bio_start,
 			extent_submit_bio_hook_t *submit_bio_done);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 601d7d4..d28d4b2 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1964,7 +1964,7 @@ int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
 
 
 	/* Tell the block device(s) that the sectors can be discarded */
-	ret = btrfs_map_block(root->fs_info, REQ_DISCARD,
+	ret = btrfs_map_block(root->fs_info, REQ_OP_DISCARD,
 			      bytenr, &num_bytes, &bbio, 0);
 	/* Error condition is -ENOMEM */
 	if (!ret) {
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 9a68a83..0dc9ec6 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2407,7 +2407,7 @@ static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset,
 	struct inode *inode = page->mapping->host;
 	struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
 	struct bio *bio;
-	int read_mode;
+	int read_mode_flags = READ_SYNC;
 	int ret;
 
 	BUG_ON(failed_bio->bi_rw & REQ_WRITE);
@@ -2423,9 +2423,7 @@ static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset,
 	}
 
 	if (failed_bio->bi_vcnt > 1)
-		read_mode = READ_SYNC | REQ_FAILFAST_DEV;
-	else
-		read_mode = READ_SYNC;
+		read_mode_flags |= REQ_FAILFAST_DEV;
 
 	phy_offset >>= inode->i_sb->s_blocksize_bits;
 	bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page,
@@ -2438,10 +2436,10 @@ static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset,
 	}
 
 	pr_debug("Repair Read Error: submitting new read[%#x] to this_mirror=%d, in_validation=%d\n",
-		 read_mode, failrec->this_mirror, failrec->in_validation);
+		 read_mode_flags, failrec->this_mirror, failrec->in_validation);
 
-	ret = tree->ops->submit_bio_hook(inode, read_mode, bio,
-					 failrec->this_mirror,
+	ret = tree->ops->submit_bio_hook(inode, REQ_OP_READ, read_mode_flags,
+					 bio, failrec->this_mirror,
 					 failrec->bio_flags, 0);
 	if (ret) {
 		free_io_failure(inode, failrec);
@@ -2750,7 +2748,7 @@ struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs)
 }
 
 
-static int __must_check submit_one_bio(int rw, struct bio *bio,
+static int __must_check submit_one_bio(int op, int op_flags, struct bio *bio,
 				       int mirror_num, unsigned long bio_flags)
 {
 	int ret = 0;
@@ -2766,18 +2764,19 @@ static int __must_check submit_one_bio(int rw, struct bio *bio,
 	bio_get(bio);
 
 	if (tree->ops && tree->ops->submit_bio_hook)
-		ret = tree->ops->submit_bio_hook(page->mapping->host, rw, bio,
-					   mirror_num, bio_flags, start);
+		ret = tree->ops->submit_bio_hook(page->mapping->host, op,
+						 op_flags, bio, mirror_num,
+						 bio_flags, start);
 	else
-		btrfsic_submit_bio(rw, bio);
+		btrfsic_submit_bio(op, op_flags, bio);
 
 	bio_put(bio);
 	return ret;
 }
 
-static int merge_bio(int rw, struct extent_io_tree *tree, struct page *page,
-		     unsigned long offset, size_t size, struct bio *bio,
-		     unsigned long bio_flags)
+static int merge_bio(int rw, struct extent_io_tree *tree,
+		     struct page *page, unsigned long offset, size_t size,
+		     struct bio *bio, unsigned long bio_flags)
 {
 	int ret = 0;
 	if (tree->ops && tree->ops->merge_bio_hook)
@@ -2788,7 +2787,7 @@ static int merge_bio(int rw, struct extent_io_tree *tree, struct page *page,
 
 }
 
-static int submit_extent_page(int rw, struct extent_io_tree *tree,
+static int submit_extent_page(int op, int op_flags, struct extent_io_tree *tree,
 			      struct writeback_control *wbc,
 			      struct page *page, sector_t sector,
 			      size_t size, unsigned long offset,
@@ -2816,9 +2815,10 @@ static int submit_extent_page(int rw, struct extent_io_tree *tree,
 
 		if (prev_bio_flags != bio_flags || !contig ||
 		    force_bio_submit ||
-		    merge_bio(rw, tree, page, offset, page_size, bio, bio_flags) ||
+		    merge_bio(op, tree, page, offset, page_size, bio,
+			      bio_flags) ||
 		    bio_add_page(bio, page, page_size, offset) < page_size) {
-			ret = submit_one_bio(rw, bio, mirror_num,
+			ret = submit_one_bio(op, op_flags, bio, mirror_num,
 					     prev_bio_flags);
 			if (ret < 0) {
 				*bio_ret = NULL;
@@ -2848,7 +2848,7 @@ static int submit_extent_page(int rw, struct extent_io_tree *tree,
 	if (bio_ret)
 		*bio_ret = bio;
 	else
-		ret = submit_one_bio(rw, bio, mirror_num, bio_flags);
+		ret = submit_one_bio(op, op_flags, bio, mirror_num, bio_flags);
 
 	return ret;
 }
@@ -2912,7 +2912,7 @@ static int __do_readpage(struct extent_io_tree *tree,
 			 get_extent_t *get_extent,
 			 struct extent_map **em_cached,
 			 struct bio **bio, int mirror_num,
-			 unsigned long *bio_flags, int rw,
+			 unsigned long *bio_flags, int op, int op_flags,
 			 u64 *prev_em_start)
 {
 	struct inode *inode = page->mapping->host;
@@ -3099,7 +3099,7 @@ static int __do_readpage(struct extent_io_tree *tree,
 		}
 
 		pnr -= page->index;
-		ret = submit_extent_page(rw, tree, NULL, page,
+		ret = submit_extent_page(op, op_flags, tree, NULL, page,
 					 sector, disk_io_size, pg_offset,
 					 bdev, bio, pnr,
 					 end_bio_extent_readpage, mirror_num,
@@ -3132,7 +3132,7 @@ static inline void __do_contiguous_readpages(struct extent_io_tree *tree,
 					     get_extent_t *get_extent,
 					     struct extent_map **em_cached,
 					     struct bio **bio, int mirror_num,
-					     unsigned long *bio_flags, int rw,
+					     unsigned long *bio_flags,
 					     u64 *prev_em_start)
 {
 	struct inode *inode;
@@ -3153,7 +3153,8 @@ static inline void __do_contiguous_readpages(struct extent_io_tree *tree,
 
 	for (index = 0; index < nr_pages; index++) {
 		__do_readpage(tree, pages[index], get_extent, em_cached, bio,
-			      mirror_num, bio_flags, rw, prev_em_start);
+			      mirror_num, bio_flags, REQ_OP_READ, 0,
+			      prev_em_start);
 		page_cache_release(pages[index]);
 	}
 }
@@ -3163,7 +3164,7 @@ static void __extent_readpages(struct extent_io_tree *tree,
 			       int nr_pages, get_extent_t *get_extent,
 			       struct extent_map **em_cached,
 			       struct bio **bio, int mirror_num,
-			       unsigned long *bio_flags, int rw,
+			       unsigned long *bio_flags,
 			       u64 *prev_em_start)
 {
 	u64 start = 0;
@@ -3185,7 +3186,7 @@ static void __extent_readpages(struct extent_io_tree *tree,
 						  index - first_index, start,
 						  end, get_extent, em_cached,
 						  bio, mirror_num, bio_flags,
-						  rw, prev_em_start);
+						  prev_em_start);
 			start = page_start;
 			end = start + PAGE_CACHE_SIZE - 1;
 			first_index = index;
@@ -3196,7 +3197,7 @@ static void __extent_readpages(struct extent_io_tree *tree,
 		__do_contiguous_readpages(tree, &pages[first_index],
 					  index - first_index, start,
 					  end, get_extent, em_cached, bio,
-					  mirror_num, bio_flags, rw,
+					  mirror_num, bio_flags,
 					  prev_em_start);
 }
 
@@ -3204,7 +3205,8 @@ static int __extent_read_full_page(struct extent_io_tree *tree,
 				   struct page *page,
 				   get_extent_t *get_extent,
 				   struct bio **bio, int mirror_num,
-				   unsigned long *bio_flags, int rw)
+				   unsigned long *bio_flags, int op,
+				   int op_flags)
 {
 	struct inode *inode = page->mapping->host;
 	struct btrfs_ordered_extent *ordered;
@@ -3223,7 +3225,7 @@ static int __extent_read_full_page(struct extent_io_tree *tree,
 	}
 
 	ret = __do_readpage(tree, page, get_extent, NULL, bio, mirror_num,
-			    bio_flags, rw, NULL);
+			    bio_flags, op, op_flags, NULL);
 	return ret;
 }
 
@@ -3235,9 +3237,10 @@ int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 	int ret;
 
 	ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num,
-				      &bio_flags, READ);
+				      &bio_flags, REQ_OP_READ, 0);
 	if (bio)
-		ret = submit_one_bio(READ, bio, mirror_num, bio_flags);
+		ret = submit_one_bio(REQ_OP_READ, 0, bio, mirror_num,
+				     bio_flags);
 	return ret;
 }
 
@@ -3249,9 +3252,10 @@ int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
 	int ret;
 
 	ret = __do_readpage(tree, page, get_extent, NULL, &bio, mirror_num,
-			    &bio_flags, READ, NULL);
+			    &bio_flags, REQ_OP_READ, 0, NULL);
 	if (bio)
-		ret = submit_one_bio(READ, bio, mirror_num, bio_flags);
+		ret = submit_one_bio(REQ_OP_READ, 0, bio, mirror_num,
+				     bio_flags);
 	return ret;
 }
 
@@ -3498,9 +3502,10 @@ static noinline_for_stack int __extent_writepage_io(struct inode *inode,
 				       page->index, cur, end);
 			}
 
-			ret = submit_extent_page(write_flags, tree, wbc, page,
-						 sector, iosize, pg_offset,
-						 bdev, &epd->bio, max_nr,
+			ret = submit_extent_page(REQ_OP_WRITE, write_flags,
+						 tree, wbc, page, sector,
+						 iosize, pg_offset, bdev,
+						 &epd->bio, max_nr,
 						 end_bio_extent_writepage,
 						 0, 0, 0, false);
 			if (ret)
@@ -3538,13 +3543,11 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
 	size_t pg_offset = 0;
 	loff_t i_size = i_size_read(inode);
 	unsigned long end_index = i_size >> PAGE_CACHE_SHIFT;
-	int write_flags;
+	int write_flags = 0;
 	unsigned long nr_written = 0;
 
 	if (wbc->sync_mode == WB_SYNC_ALL)
 		write_flags = WRITE_SYNC;
-	else
-		write_flags = WRITE;
 
 	trace___extent_writepage(page, inode, wbc);
 
@@ -3788,7 +3791,7 @@ static noinline_for_stack int write_one_eb(struct extent_buffer *eb,
 	u64 offset = eb->start;
 	unsigned long i, num_pages;
 	unsigned long bio_flags = 0;
-	int rw = (epd->sync_io ? WRITE_SYNC : WRITE) | REQ_META;
+	int op_flags = (epd->sync_io ? WRITE_SYNC : 0) | REQ_META;
 	int ret = 0;
 
 	clear_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags);
@@ -3802,9 +3805,10 @@ static noinline_for_stack int write_one_eb(struct extent_buffer *eb,
 
 		clear_page_dirty_for_io(p);
 		set_page_writeback(p);
-		ret = submit_extent_page(rw, tree, wbc, p, offset >> 9,
-					 PAGE_CACHE_SIZE, 0, bdev, &epd->bio,
-					 -1, end_bio_extent_buffer_writepage,
+		ret = submit_extent_page(REQ_OP_WRITE, op_flags, tree, wbc, p,
+					 offset >> 9, PAGE_CACHE_SIZE, 0, bdev,
+					 &epd->bio, -1,
+					 end_bio_extent_buffer_writepage,
 					 0, epd->bio_flags, bio_flags, false);
 		epd->bio_flags = bio_flags;
 		if (ret) {
@@ -4093,13 +4097,14 @@ retry:
 static void flush_epd_write_bio(struct extent_page_data *epd)
 {
 	if (epd->bio) {
-		int rw = WRITE;
+		int op_flags  = 0;
 		int ret;
 
 		if (epd->sync_io)
-			rw = WRITE_SYNC;
+			op_flags = WRITE_SYNC;
 
-		ret = submit_one_bio(rw, epd->bio, 0, epd->bio_flags);
+		ret = submit_one_bio(REQ_OP_WRITE, op_flags, epd->bio, 0,
+				     epd->bio_flags);
 		BUG_ON(ret < 0); /* -ENOMEM */
 		epd->bio = NULL;
 	}
@@ -4226,19 +4231,19 @@ int extent_readpages(struct extent_io_tree *tree,
 		if (nr < ARRAY_SIZE(pagepool))
 			continue;
 		__extent_readpages(tree, pagepool, nr, get_extent, &em_cached,
-				   &bio, 0, &bio_flags, READ, &prev_em_start);
+				   &bio, 0, &bio_flags, &prev_em_start);
 		nr = 0;
 	}
 	if (nr)
 		__extent_readpages(tree, pagepool, nr, get_extent, &em_cached,
-				   &bio, 0, &bio_flags, READ, &prev_em_start);
+				   &bio, 0, &bio_flags, &prev_em_start);
 
 	if (em_cached)
 		free_extent_map(em_cached);
 
 	BUG_ON(!list_empty(pages));
 	if (bio)
-		return submit_one_bio(READ, bio, 0, bio_flags);
+		return submit_one_bio(REQ_OP_READ, 0, bio, 0, bio_flags);
 	return 0;
 }
 
@@ -5254,7 +5259,7 @@ int read_extent_buffer_pages(struct extent_io_tree *tree,
 			err = __extent_read_full_page(tree, page,
 						      get_extent, &bio,
 						      mirror_num, &bio_flags,
-						      READ | REQ_META);
+						      REQ_OP_READ, REQ_META);
 			if (err)
 				ret = err;
 		} else {
@@ -5263,7 +5268,7 @@ int read_extent_buffer_pages(struct extent_io_tree *tree,
 	}
 
 	if (bio) {
-		err = submit_one_bio(READ | REQ_META, bio, mirror_num,
+		err = submit_one_bio(REQ_OP_READ, REQ_META, bio, mirror_num,
 				     bio_flags);
 		if (err)
 			return err;
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index c668f36..28d8929 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -61,9 +61,10 @@ struct extent_state;
 struct btrfs_root;
 struct btrfs_io_bio;
 
-typedef	int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
-				       struct bio *bio, int mirror_num,
-				       unsigned long bio_flags, u64 bio_offset);
+typedef	int (extent_submit_bio_hook_t)(struct inode *inode, int op,
+				       int op_flags, struct bio *bio,
+				       int mirror_num, unsigned long bio_flags,
+				       u64 bio_offset);
 struct extent_io_ops {
 	int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
 			     u64 start, u64 end, int *page_started,
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 0ad8bab..dd0b769 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1785,8 +1785,7 @@ static void btrfs_clear_bit_hook(struct inode *inode,
  * we don't create bios that span stripes or chunks
  */
 int btrfs_merge_bio_hook(int rw, struct page *page, unsigned long offset,
-			 size_t size, struct bio *bio,
-			 unsigned long bio_flags)
+			 size_t size, struct bio *bio, unsigned long bio_flags)
 {
 	struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
 	u64 logical = (u64)bio->bi_iter.bi_sector << 9;
@@ -1816,7 +1815,7 @@ int btrfs_merge_bio_hook(int rw, struct page *page, unsigned long offset,
  * At IO completion time the cums attached on the ordered extent record
  * are inserted into the btree
  */
-static int __btrfs_submit_bio_start(struct inode *inode, int rw,
+static int __btrfs_submit_bio_start(struct inode *inode, int op, int op_flags,
 				    struct bio *bio, int mirror_num,
 				    unsigned long bio_flags,
 				    u64 bio_offset)
@@ -1837,14 +1836,14 @@ static int __btrfs_submit_bio_start(struct inode *inode, int rw,
  * At IO completion time the cums attached on the ordered extent record
  * are inserted into the btree
  */
-static int __btrfs_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
-			  int mirror_num, unsigned long bio_flags,
-			  u64 bio_offset)
+static int __btrfs_submit_bio_done(struct inode *inode, int op, int op_flags,
+				   struct bio *bio, int mirror_num,
+				   unsigned long bio_flags, u64 bio_offset)
 {
 	struct btrfs_root *root = BTRFS_I(inode)->root;
 	int ret;
 
-	ret = btrfs_map_bio(root, rw, bio, mirror_num, 1);
+	ret = btrfs_map_bio(root, op, op_flags, bio, mirror_num, 1);
 	if (ret) {
 		bio->bi_error = ret;
 		bio_endio(bio);
@@ -1856,9 +1855,9 @@ static int __btrfs_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
  * extent_io.c submission hook. This does the right thing for csum calculation
  * on write, or reading the csums from the tree before a read
  */
-static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
-			  int mirror_num, unsigned long bio_flags,
-			  u64 bio_offset)
+static int btrfs_submit_bio_hook(struct inode *inode, int op, int op_flags,
+				 struct bio *bio, int mirror_num,
+				 unsigned long bio_flags, u64 bio_offset)
 {
 	struct btrfs_root *root = BTRFS_I(inode)->root;
 	int ret = 0;
@@ -1871,7 +1870,7 @@ static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
 	if (btrfs_is_free_space_inode(inode))
 		metadata = 2;
 
-	if (!(rw & REQ_WRITE)) {
+	if (!(op == REQ_OP_WRITE)) {
 		ret = btrfs_bio_wq_end_io(root->fs_info, bio, metadata);
 		if (ret)
 			goto out;
@@ -1893,7 +1892,7 @@ static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
 			goto mapit;
 		/* we're doing a write, do the async checksumming */
 		ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
-				   inode, rw, bio, mirror_num,
+				   inode, op, op_flags, bio, mirror_num,
 				   bio_flags, bio_offset,
 				   __btrfs_submit_bio_start,
 				   __btrfs_submit_bio_done);
@@ -1905,7 +1904,7 @@ static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
 	}
 
 mapit:
-	ret = btrfs_map_bio(root, rw, bio, mirror_num, 0);
+	ret = btrfs_map_bio(root, op, op_flags, bio, mirror_num, 0);
 
 out:
 	if (ret < 0) {
@@ -7613,13 +7612,11 @@ unlock_err:
 }
 
 static inline int submit_dio_repair_bio(struct inode *inode, struct bio *bio,
-					int rw, int mirror_num)
+					int op_flags, int mirror_num)
 {
 	struct btrfs_root *root = BTRFS_I(inode)->root;
 	int ret;
 
-	BUG_ON(rw & REQ_WRITE);
-
 	bio_get(bio);
 
 	ret = btrfs_bio_wq_end_io(root->fs_info, bio,
@@ -7627,7 +7624,7 @@ static inline int submit_dio_repair_bio(struct inode *inode, struct bio *bio,
 	if (ret)
 		goto err;
 
-	ret = btrfs_map_bio(root, rw, bio, mirror_num, 0);
+	ret = btrfs_map_bio(root, REQ_OP_READ, op_flags, bio, mirror_num, 0);
 err:
 	bio_put(bio);
 	return ret;
@@ -7939,9 +7936,11 @@ out_test:
 	bio_put(bio);
 }
 
-static int __btrfs_submit_bio_start_direct_io(struct inode *inode, int rw,
-				    struct bio *bio, int mirror_num,
-				    unsigned long bio_flags, u64 offset)
+static int __btrfs_submit_bio_start_direct_io(struct inode *inode, int op,
+					      int op_flags, struct bio *bio,
+					      int mirror_num,
+					      unsigned long bio_flags,
+					      u64 offset)
 {
 	int ret;
 	struct btrfs_root *root = BTRFS_I(inode)->root;
@@ -8032,11 +8031,11 @@ static inline int btrfs_lookup_and_bind_dio_csum(struct btrfs_root *root,
 }
 
 static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode,
-					 int rw, u64 file_offset, int skip_sum,
-					 int async_submit)
+					 int op, int op_flags, u64 file_offset,
+					 int skip_sum, int async_submit)
 {
 	struct btrfs_dio_private *dip = bio->bi_private;
-	int write = rw & REQ_WRITE;
+	bool write = op == REQ_OP_WRITE ? true : false;
 	struct btrfs_root *root = BTRFS_I(inode)->root;
 	int ret;
 
@@ -8057,7 +8056,7 @@ static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode,
 
 	if (write && async_submit) {
 		ret = btrfs_wq_submit_bio(root->fs_info,
-				   inode, rw, bio, 0, 0,
+				   inode, op, op_flags, bio, 0, 0,
 				   file_offset,
 				   __btrfs_submit_bio_start_direct_io,
 				   __btrfs_submit_bio_done);
@@ -8077,14 +8076,14 @@ static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode,
 			goto err;
 	}
 map:
-	ret = btrfs_map_bio(root, rw, bio, 0, async_submit);
+	ret = btrfs_map_bio(root, op, op_flags, bio, 0, async_submit);
 err:
 	bio_put(bio);
 	return ret;
 }
 
-static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip,
-				    int skip_sum)
+static int btrfs_submit_direct_hook(int op, int op_flags,
+				    struct btrfs_dio_private *dip, int skip_sum)
 {
 	struct inode *inode = dip->inode;
 	struct btrfs_root *root = BTRFS_I(inode)->root;
@@ -8100,7 +8099,7 @@ static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip,
 	int async_submit = 0;
 
 	map_length = orig_bio->bi_iter.bi_size;
-	ret = btrfs_map_block(root->fs_info, rw, start_sector << 9,
+	ret = btrfs_map_block(root->fs_info, op, start_sector << 9,
 			      &map_length, NULL, 0);
 	if (ret)
 		return -EIO;
@@ -8137,7 +8136,7 @@ static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip,
 			 * before we're done setting it up
 			 */
 			atomic_inc(&dip->pending_bios);
-			ret = __btrfs_submit_dio_bio(bio, inode, rw,
+			ret = __btrfs_submit_dio_bio(bio, inode, op, op_flags,
 						     file_offset, skip_sum,
 						     async_submit);
 			if (ret) {
@@ -8161,7 +8160,7 @@ static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip,
 			btrfs_io_bio(bio)->logical = file_offset;
 
 			map_length = orig_bio->bi_iter.bi_size;
-			ret = btrfs_map_block(root->fs_info, rw,
+			ret = btrfs_map_block(root->fs_info, op,
 					      start_sector << 9,
 					      &map_length, NULL, 0);
 			if (ret) {
@@ -8176,8 +8175,8 @@ static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip,
 	}
 
 submit:
-	ret = __btrfs_submit_dio_bio(bio, inode, rw, file_offset, skip_sum,
-				     async_submit);
+	ret = __btrfs_submit_dio_bio(bio, inode, op, op_flags, file_offset,
+				     skip_sum, async_submit);
 	if (!ret)
 		return 0;
 
@@ -8238,7 +8237,7 @@ static void btrfs_submit_direct(int op, int op_flags, struct bio *dio_bio,
 		dip->subio_endio = btrfs_subio_endio_read;
 	}
 
-	ret = btrfs_submit_direct_hook(op | op_flags, dip, skip_sum);
+	ret = btrfs_submit_direct_hook(op, op_flags, dip, skip_sum);
 	if (!ret)
 		return;
 
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 9cb6f9a..8b72207 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1784,7 +1784,7 @@ static void scrub_wr_submit(struct scrub_ctx *sctx)
 	 * orders the requests before sending them to the driver which
 	 * doubled the write performance on spinning disks when measured
 	 * with Linux 3.5 */
-	btrfsic_submit_bio(WRITE, sbio->bio);
+	btrfsic_submit_bio(REQ_OP_WRITE, 0, sbio->bio);
 }
 
 static void scrub_wr_bio_end_io(struct bio *bio)
@@ -2084,7 +2084,7 @@ static void scrub_submit(struct scrub_ctx *sctx)
 	sbio = sctx->bios[sctx->curr];
 	sctx->curr = -1;
 	scrub_pending_bio_inc(sctx);
-	btrfsic_submit_bio(READ, sbio->bio);
+	btrfsic_submit_bio(REQ_OP_READ, 0, sbio->bio);
 }
 
 static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 6fc73586..3dfac71 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -367,7 +367,7 @@ loop_lock:
 			sync_pending = 0;
 		}
 
-		btrfsic_submit_bio(cur->bi_rw, cur);
+		btrfsic_submit_bio(cur->bi_rw, 0, cur);
 		num_run++;
 		batch_run++;
 
@@ -5091,7 +5091,7 @@ void btrfs_put_bbio(struct btrfs_bio *bbio)
 		kfree(bbio);
 }
 
-static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
+static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int op,
 			     u64 logical, u64 *length,
 			     struct btrfs_bio **bbio_ret,
 			     int mirror_num, int need_raid_map)
@@ -5169,7 +5169,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 		raid56_full_stripe_start *= full_stripe_len;
 	}
 
-	if (rw & REQ_DISCARD) {
+	if (op == REQ_OP_DISCARD) {
 		/* we don't discard raid56 yet */
 		if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
 			ret = -EOPNOTSUPP;
@@ -5182,7 +5182,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 		   For other RAID types and for RAID[56] reads, just allow a single
 		   stripe (on a single disk). */
 		if ((map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) &&
-		    (rw & REQ_WRITE)) {
+		    (op == REQ_OP_WRITE)) {
 			max_len = stripe_len * nr_data_stripes(map) -
 				(offset - raid56_full_stripe_start);
 		} else {
@@ -5205,8 +5205,8 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 		btrfs_dev_replace_unlock(dev_replace);
 
 	if (dev_replace_is_ongoing && mirror_num == map->num_stripes + 1 &&
-	    !(rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)) &&
-	    dev_replace->tgtdev != NULL) {
+	    !(op == REQ_OP_WRITE || op == REQ_OP_DISCARD ||
+	     op == REQ_GET_READ_MIRRORS) && dev_replace->tgtdev != NULL) {
 		/*
 		 * in dev-replace case, for repair case (that's the only
 		 * case where the mirror is selected explicitly when
@@ -5295,15 +5295,17 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 			    (offset + *length);
 
 	if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
-		if (rw & REQ_DISCARD)
+		if (op == REQ_OP_DISCARD)
 			num_stripes = min_t(u64, map->num_stripes,
 					    stripe_nr_end - stripe_nr_orig);
 		stripe_nr = div_u64_rem(stripe_nr, map->num_stripes,
 				&stripe_index);
-		if (!(rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)))
+		if (!(op == REQ_OP_WRITE || op == REQ_OP_DISCARD ||
+		    op == REQ_GET_READ_MIRRORS))
 			mirror_num = 1;
 	} else if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
-		if (rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS))
+		if (op == REQ_OP_WRITE || op == REQ_OP_DISCARD ||
+		    op == REQ_GET_READ_MIRRORS)
 			num_stripes = map->num_stripes;
 		else if (mirror_num)
 			stripe_index = mirror_num - 1;
@@ -5316,7 +5318,8 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 		}
 
 	} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
-		if (rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)) {
+		if (op == REQ_OP_WRITE || op == REQ_OP_DISCARD ||
+		    op == REQ_GET_READ_MIRRORS) {
 			num_stripes = map->num_stripes;
 		} else if (mirror_num) {
 			stripe_index = mirror_num - 1;
@@ -5330,9 +5333,9 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 		stripe_nr = div_u64_rem(stripe_nr, factor, &stripe_index);
 		stripe_index *= map->sub_stripes;
 
-		if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS))
+		if (op == REQ_OP_WRITE || op == REQ_GET_READ_MIRRORS)
 			num_stripes = map->sub_stripes;
-		else if (rw & REQ_DISCARD)
+		else if (op == REQ_OP_DISCARD)
 			num_stripes = min_t(u64, map->sub_stripes *
 					    (stripe_nr_end - stripe_nr_orig),
 					    map->num_stripes);
@@ -5350,7 +5353,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 
 	} else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
 		if (need_raid_map &&
-		    ((rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) ||
+		    ((op == REQ_OP_WRITE || op == REQ_GET_READ_MIRRORS) ||
 		     mirror_num > 1)) {
 			/* push stripe_nr back to the start of the full stripe */
 			stripe_nr = div_u64(raid56_full_stripe_start,
@@ -5378,8 +5381,8 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 			/* We distribute the parity blocks across stripes */
 			div_u64_rem(stripe_nr + stripe_index, map->num_stripes,
 					&stripe_index);
-			if (!(rw & (REQ_WRITE | REQ_DISCARD |
-				    REQ_GET_READ_MIRRORS)) && mirror_num <= 1)
+			if (!(op == REQ_OP_WRITE || op == REQ_OP_DISCARD ||
+			      op == REQ_GET_READ_MIRRORS) && mirror_num <= 1)
 				mirror_num = 1;
 		}
 	} else {
@@ -5396,9 +5399,9 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 
 	num_alloc_stripes = num_stripes;
 	if (dev_replace_is_ongoing) {
-		if (rw & (REQ_WRITE | REQ_DISCARD))
+		if (op == REQ_OP_WRITE || op == REQ_OP_DISCARD)
 			num_alloc_stripes <<= 1;
-		if (rw & REQ_GET_READ_MIRRORS)
+		if (op == REQ_GET_READ_MIRRORS)
 			num_alloc_stripes++;
 		tgtdev_indexes = num_stripes;
 	}
@@ -5413,7 +5416,8 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 
 	/* build raid_map */
 	if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK &&
-	    need_raid_map && ((rw & (REQ_WRITE | REQ_GET_READ_MIRRORS)) ||
+	    need_raid_map &&
+	   ((op == REQ_OP_WRITE || op == REQ_GET_READ_MIRRORS) ||
 	    mirror_num > 1)) {
 		u64 tmp;
 		unsigned rot;
@@ -5438,7 +5442,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 				RAID6_Q_STRIPE;
 	}
 
-	if (rw & REQ_DISCARD) {
+	if (op == REQ_OP_DISCARD) {
 		u32 factor = 0;
 		u32 sub_stripes = 0;
 		u64 stripes_per_dev = 0;
@@ -5518,14 +5522,15 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 		}
 	}
 
-	if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS))
+	if (op == REQ_OP_WRITE || op == REQ_GET_READ_MIRRORS)
 		max_errors = btrfs_chunk_max_errors(map);
 
 	if (bbio->raid_map)
 		sort_parity_stripes(bbio, num_stripes);
 
 	tgtdev_indexes = 0;
-	if (dev_replace_is_ongoing && (rw & (REQ_WRITE | REQ_DISCARD)) &&
+	if (dev_replace_is_ongoing &&
+	    (op == REQ_OP_WRITE || op == REQ_OP_DISCARD) &&
 	    dev_replace->tgtdev != NULL) {
 		int index_where_to_add;
 		u64 srcdev_devid = dev_replace->srcdev->devid;
@@ -5560,7 +5565,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 			}
 		}
 		num_stripes = index_where_to_add;
-	} else if (dev_replace_is_ongoing && (rw & REQ_GET_READ_MIRRORS) &&
+	} else if (dev_replace_is_ongoing && (op == REQ_GET_READ_MIRRORS) &&
 		   dev_replace->tgtdev != NULL) {
 		u64 srcdev_devid = dev_replace->srcdev->devid;
 		int index_srcdev = 0;
@@ -5637,8 +5642,8 @@ int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 		      u64 logical, u64 *length,
 		      struct btrfs_bio **bbio_ret, int mirror_num)
 {
-	return __btrfs_map_block(fs_info, rw, logical, length, bbio_ret,
-				 mirror_num, 0);
+	return __btrfs_map_block(fs_info, rw, logical, length,
+				 bbio_ret, mirror_num, 0);
 }
 
 /* For Scrub/replace */
@@ -5815,7 +5820,7 @@ static void btrfs_end_bio(struct bio *bio)
  */
 static noinline void btrfs_schedule_bio(struct btrfs_root *root,
 					struct btrfs_device *device,
-					int rw, struct bio *bio)
+					int op, int op_flags, struct bio *bio)
 {
 	int should_queue = 1;
 	struct btrfs_pending_bios *pending_bios;
@@ -5826,9 +5831,9 @@ static noinline void btrfs_schedule_bio(struct btrfs_root *root,
 	}
 
 	/* don't bother with additional async steps for reads, right now */
-	if (!(rw & REQ_WRITE)) {
+	if (!(op == REQ_OP_WRITE)) {
 		bio_get(bio);
-		btrfsic_submit_bio(rw, bio);
+		btrfsic_submit_bio(op, op_flags, bio);
 		bio_put(bio);
 		return;
 	}
@@ -5842,7 +5847,7 @@ static noinline void btrfs_schedule_bio(struct btrfs_root *root,
 	atomic_inc(&root->fs_info->nr_async_bios);
 	WARN_ON(bio->bi_next);
 	bio->bi_next = NULL;
-	bio->bi_rw |= rw;
+	bio->bi_rw |= op | op_flags;
 
 	spin_lock(&device->io_lock);
 	if (bio->bi_rw & REQ_SYNC)
@@ -5868,7 +5873,7 @@ static noinline void btrfs_schedule_bio(struct btrfs_root *root,
 
 static void submit_stripe_bio(struct btrfs_root *root, struct btrfs_bio *bbio,
 			      struct bio *bio, u64 physical, int dev_nr,
-			      int rw, int async)
+			      int op, int op_flags, int async)
 {
 	struct btrfs_device *dev = bbio->stripes[dev_nr].dev;
 
@@ -5882,8 +5887,8 @@ static void submit_stripe_bio(struct btrfs_root *root, struct btrfs_bio *bbio,
 
 		rcu_read_lock();
 		name = rcu_dereference(dev->name);
-		pr_debug("btrfs_map_bio: rw %d, sector=%llu, dev=%lu "
-			 "(%s id %llu), size=%u\n", rw,
+		pr_debug("btrfs_map_bio: rw %d,%d, sector=%llu, dev=%lu "
+			 "(%s id %llu), size=%u\n", op, op_flags,
 			 (u64)bio->bi_iter.bi_sector, (u_long)dev->bdev->bd_dev,
 			 name->str, dev->devid, bio->bi_iter.bi_size);
 		rcu_read_unlock();
@@ -5894,9 +5899,9 @@ static void submit_stripe_bio(struct btrfs_root *root, struct btrfs_bio *bbio,
 	btrfs_bio_counter_inc_noblocked(root->fs_info);
 
 	if (async)
-		btrfs_schedule_bio(root, dev, rw, bio);
+		btrfs_schedule_bio(root, dev, op, op_flags, bio);
 	else
-		btrfsic_submit_bio(rw, bio);
+		btrfsic_submit_bio(op, op_flags, bio);
 }
 
 static void bbio_error(struct btrfs_bio *bbio, struct bio *bio, u64 logical)
@@ -5913,8 +5918,8 @@ static void bbio_error(struct btrfs_bio *bbio, struct bio *bio, u64 logical)
 	}
 }
 
-int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
-		  int mirror_num, int async_submit)
+int btrfs_map_bio(struct btrfs_root *root, int op, int op_flags,
+		  struct bio *bio, int mirror_num, int async_submit)
 {
 	struct btrfs_device *dev;
 	struct bio *first_bio = bio;
@@ -5930,8 +5935,8 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
 	map_length = length;
 
 	btrfs_bio_counter_inc_blocked(root->fs_info);
-	ret = __btrfs_map_block(root->fs_info, rw, logical, &map_length, &bbio,
-			      mirror_num, 1);
+	ret = __btrfs_map_block(root->fs_info, op, logical, &map_length, &bbio,
+				mirror_num, 1);
 	if (ret) {
 		btrfs_bio_counter_dec(root->fs_info);
 		return ret;
@@ -5947,7 +5952,7 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
 	if (bbio->raid_map) {
 		/* In this case, map_length has been set to the length of
 		   a single stripe; not the whole write */
-		if (rw & WRITE) {
+		if (op == REQ_OP_WRITE) {
 			ret = raid56_parity_write(root, bio, bbio, map_length);
 		} else {
 			ret = raid56_parity_recover(root, bio, bbio, map_length,
@@ -5966,7 +5971,8 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
 
 	for (dev_nr = 0; dev_nr < total_devs; dev_nr++) {
 		dev = bbio->stripes[dev_nr].dev;
-		if (!dev || !dev->bdev || (rw & WRITE && !dev->writeable)) {
+		if (!dev || !dev->bdev ||
+		    (op == REQ_OP_WRITE && !dev->writeable)) {
 			bbio_error(bbio, first_bio, logical);
 			continue;
 		}
@@ -5978,8 +5984,8 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
 			bio = first_bio;
 
 		submit_stripe_bio(root, bbio, bio,
-				  bbio->stripes[dev_nr].physical, dev_nr, rw,
-				  async_submit);
+				  bbio->stripes[dev_nr].physical, dev_nr, op,
+				  op_flags, async_submit);
 	}
 	btrfs_bio_counter_dec(root->fs_info);
 	return 0;
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 595279a..22cd8c3 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -426,8 +426,8 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 		      struct btrfs_root *extent_root, u64 type);
 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
-int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
-		  int mirror_num, int async_submit);
+int btrfs_map_bio(struct btrfs_root *root, int op, int op_flags,
+		  struct bio *bio, int mirror_num, int async_submit);
 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 		       fmode_t flags, void *holder);
 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
-- 
1.8.3.1

[PATCH 10/32] f2fs: prepare for bi_rw split

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch prepares f2fs's submit_bio use for the next
patches that split bi_rw into a operation and flags field.
Instead of passing in a bitmap with both the operation and
flags mixed in, the callers will now pass them in seperately.

This patch modifies the code related to the submit_bio calls
so the flags and operation are seperated. When this is done
for all code, one of the later patches in the series will
the actual submit_bio call, so the patches are bisectable.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 fs/f2fs/checkpoint.c        |  6 ++++--
 fs/f2fs/data.c              | 30 ++++++++++++++++++------------
 fs/f2fs/f2fs.h              |  5 +++--
 fs/f2fs/gc.c                | 11 +++++++----
 fs/f2fs/inline.c            |  3 ++-
 fs/f2fs/node.c              | 10 ++++++----
 fs/f2fs/segment.c           |  6 ++++--
 fs/f2fs/trace.c             |  8 +++++---
 include/trace/events/f2fs.h | 34 +++++++++++++++++++++-------------
 9 files changed, 70 insertions(+), 43 deletions(-)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index c5a38e3..ebab316 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -54,7 +54,8 @@ struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
 	struct f2fs_io_info fio = {
 		.sbi = sbi,
 		.type = META,
-		.rw = READ_SYNC | REQ_META | REQ_PRIO,
+		.op = REQ_OP_READ,
+		.op_flags = READ_SYNC | REQ_META | REQ_PRIO,
 		.blk_addr = index,
 		.encrypted_page = NULL,
 	};
@@ -133,7 +134,8 @@ int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages, int type
 	struct f2fs_io_info fio = {
 		.sbi = sbi,
 		.type = META,
-		.rw = READ_SYNC | REQ_META | REQ_PRIO,
+		.op = REQ_OP_READ,
+		.op_flags = READ_SYNC | REQ_META | REQ_PRIO,
 		.encrypted_page = NULL,
 	};
 
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index a82abe9..fb767e4f 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -107,12 +107,12 @@ static void __submit_merged_bio(struct f2fs_bio_info *io)
 	if (!io->bio)
 		return;
 
-	if (is_read_io(fio->rw))
+	if (is_read_io(fio->op))
 		trace_f2fs_submit_read_bio(io->sbi->sb, fio, io->bio);
 	else
 		trace_f2fs_submit_write_bio(io->sbi->sb, fio, io->bio);
 
-	submit_bio(fio->rw, io->bio);
+	submit_bio(fio->op | fio->op_flags, io->bio);
 	io->bio = NULL;
 }
 
@@ -129,10 +129,12 @@ void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
 	/* change META to META_FLUSH in the checkpoint procedure */
 	if (type >= META_FLUSH) {
 		io->fio.type = META_FLUSH;
+		io->fio.op = REQ_OP_WRITE;
 		if (test_opt(sbi, NOBARRIER))
-			io->fio.rw = WRITE_FLUSH | REQ_META | REQ_PRIO;
+			io->fio.op_flags = WRITE_FLUSH | REQ_META | REQ_PRIO;
 		else
-			io->fio.rw = WRITE_FLUSH_FUA | REQ_META | REQ_PRIO;
+			io->fio.op_flags = WRITE_FLUSH_FUA | REQ_META |
+								REQ_PRIO;
 	}
 	__submit_merged_bio(io);
 	up_write(&io->io_rwsem);
@@ -151,14 +153,14 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio)
 	f2fs_trace_ios(fio, 0);
 
 	/* Allocate a new bio */
-	bio = __bio_alloc(fio->sbi, fio->blk_addr, 1, is_read_io(fio->rw));
+	bio = __bio_alloc(fio->sbi, fio->blk_addr, 1, is_read_io(fio->op));
 
 	if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) {
 		bio_put(bio);
 		return -EFAULT;
 	}
 
-	submit_bio(fio->rw, bio);
+	submit_bio(fio->op | fio->op_flags, bio);
 	return 0;
 }
 
@@ -167,7 +169,7 @@ void f2fs_submit_page_mbio(struct f2fs_io_info *fio)
 	struct f2fs_sb_info *sbi = fio->sbi;
 	enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
 	struct f2fs_bio_info *io;
-	bool is_read = is_read_io(fio->rw);
+	bool is_read = is_read_io(fio->op);
 	struct page *bio_page;
 
 	io = is_read ? &sbi->read_io : &sbi->write_io[btype];
@@ -180,7 +182,7 @@ void f2fs_submit_page_mbio(struct f2fs_io_info *fio)
 		inc_page_count(sbi, F2FS_WRITEBACK);
 
 	if (io->bio && (io->last_block_in_bio != fio->blk_addr - 1 ||
-						io->fio.rw != fio->rw))
+						io->fio.op != fio->op))
 		__submit_merged_bio(io);
 alloc_new:
 	if (io->bio == NULL) {
@@ -275,7 +277,8 @@ int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index)
 	return f2fs_reserve_block(dn, index);
 }
 
-struct page *get_read_data_page(struct inode *inode, pgoff_t index, int rw)
+struct page *get_read_data_page(struct inode *inode, pgoff_t index,
+				int op_flags)
 {
 	struct address_space *mapping = inode->i_mapping;
 	struct dnode_of_data dn;
@@ -285,7 +288,8 @@ struct page *get_read_data_page(struct inode *inode, pgoff_t index, int rw)
 	struct f2fs_io_info fio = {
 		.sbi = F2FS_I_SB(inode),
 		.type = DATA,
-		.rw = rw,
+		.op = REQ_OP_READ,
+		.op_flags = op_flags,
 		.encrypted_page = NULL,
 	};
 
@@ -1088,7 +1092,8 @@ static int f2fs_write_data_page(struct page *page,
 	struct f2fs_io_info fio = {
 		.sbi = sbi,
 		.type = DATA,
-		.rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE,
+		.op = REQ_OP_WRITE,
+		.op_flags = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : 0,
 		.page = page,
 		.encrypted_page = NULL,
 	};
@@ -1449,7 +1454,8 @@ put_next:
 		struct f2fs_io_info fio = {
 			.sbi = sbi,
 			.type = DATA,
-			.rw = READ_SYNC,
+			.op = REQ_OP_READ,
+			.op_flags = READ_SYNC,
 			.blk_addr = dn.data_blkaddr,
 			.page = page,
 			.encrypted_page = NULL,
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index f1a90ff..c839abb 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -667,13 +667,14 @@ enum page_type {
 struct f2fs_io_info {
 	struct f2fs_sb_info *sbi;	/* f2fs_sb_info pointer */
 	enum page_type type;	/* contains DATA/NODE/META/META_FLUSH */
-	int rw;			/* contains R/RS/W/WS with REQ_META/REQ_PRIO */
+	int op;			/* contains REQ_OP_ */
+	int op_flags;		/* rq_flag_bits */
 	block_t blk_addr;	/* block address to be written */
 	struct page *page;	/* page to be written */
 	struct page *encrypted_page;	/* encrypted page */
 };
 
-#define is_read_io(rw)	(((rw) & 1) == READ)
+#define is_read_io(rw)	(rw == READ)
 struct f2fs_bio_info {
 	struct f2fs_sb_info *sbi;	/* f2fs superblock */
 	struct bio *bio;		/* bios to merge */
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 782b8e7..64cb127 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -531,7 +531,8 @@ static void move_encrypted_block(struct inode *inode, block_t bidx)
 	struct f2fs_io_info fio = {
 		.sbi = F2FS_I_SB(inode),
 		.type = DATA,
-		.rw = READ_SYNC,
+		.op = REQ_OP_READ,
+		.op_flags = READ_SYNC,
 		.encrypted_page = NULL,
 	};
 	struct dnode_of_data dn;
@@ -590,7 +591,8 @@ static void move_encrypted_block(struct inode *inode, block_t bidx)
 	f2fs_wait_on_page_writeback(dn.node_page, NODE);
 	allocate_data_block(fio.sbi, NULL, fio.blk_addr,
 					&fio.blk_addr, &sum, CURSEG_COLD_DATA);
-	fio.rw = WRITE_SYNC;
+	fio.op = REQ_OP_WRITE;
+	fio.op_flags = WRITE_SYNC;
 	f2fs_submit_page_mbio(&fio);
 
 	dn.data_blkaddr = fio.blk_addr;
@@ -624,7 +626,8 @@ static void move_data_page(struct inode *inode, block_t bidx, int gc_type)
 		struct f2fs_io_info fio = {
 			.sbi = F2FS_I_SB(inode),
 			.type = DATA,
-			.rw = WRITE_SYNC,
+			.op = REQ_OP_WRITE,
+			.op_flags = WRITE_SYNC,
 			.page = page,
 			.encrypted_page = NULL,
 		};
@@ -705,7 +708,7 @@ next_step:
 
 			start_bidx = start_bidx_of_node(nofs, F2FS_I(inode));
 			data_page = get_read_data_page(inode,
-					start_bidx + ofs_in_node, READA);
+					start_bidx + ofs_in_node, REQ_RAHEAD);
 			if (IS_ERR(data_page)) {
 				iput(inode);
 				continue;
diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index 3d143be..65748d7 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -111,7 +111,8 @@ int f2fs_convert_inline_page(struct dnode_of_data *dn, struct page *page)
 	struct f2fs_io_info fio = {
 		.sbi = F2FS_I_SB(dn->inode),
 		.type = DATA,
-		.rw = WRITE_SYNC | REQ_PRIO,
+		.op = REQ_OP_WRITE,
+		.op_flags = WRITE_SYNC | REQ_PRIO,
 		.page = page,
 		.encrypted_page = NULL,
 	};
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 27d1a74..a3561a1 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1001,14 +1001,15 @@ fail:
  * 0: f2fs_put_page(page, 0)
  * LOCKED_PAGE or error: f2fs_put_page(page, 1)
  */
-static int read_node_page(struct page *page, int rw)
+static int read_node_page(struct page *page, int op_flags)
 {
 	struct f2fs_sb_info *sbi = F2FS_P_SB(page);
 	struct node_info ni;
 	struct f2fs_io_info fio = {
 		.sbi = sbi,
 		.type = NODE,
-		.rw = rw,
+		.op = REQ_OP_READ,
+		.op_flags = op_flags,
 		.page = page,
 		.encrypted_page = NULL,
 	};
@@ -1046,7 +1047,7 @@ void ra_node_page(struct f2fs_sb_info *sbi, nid_t nid)
 	if (!apage)
 		return;
 
-	err = read_node_page(apage, READA);
+	err = read_node_page(apage, REQ_RAHEAD);
 	f2fs_put_page(apage, err ? 1 : 0);
 }
 
@@ -1305,7 +1306,8 @@ static int f2fs_write_node_page(struct page *page,
 	struct f2fs_io_info fio = {
 		.sbi = sbi,
 		.type = NODE,
-		.rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE,
+		.op = REQ_OP_WRITE,
+		.op_flags = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : 0,
 		.page = page,
 		.encrypted_page = NULL,
 	};
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 7d2972b..14402c6 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -228,7 +228,8 @@ int commit_inmem_pages(struct inode *inode, bool abort)
 	struct f2fs_io_info fio = {
 		.sbi = sbi,
 		.type = DATA,
-		.rw = WRITE_SYNC | REQ_PRIO,
+		.op = REQ_OP_WRITE,
+		.op_flags = WRITE_SYNC | REQ_PRIO,
 		.encrypted_page = NULL,
 	};
 	int err = 0;
@@ -1286,7 +1287,8 @@ void write_meta_page(struct f2fs_sb_info *sbi, struct page *page)
 	struct f2fs_io_info fio = {
 		.sbi = sbi,
 		.type = META,
-		.rw = WRITE_SYNC | REQ_META | REQ_PRIO,
+		.op = REQ_OP_WRITE,
+		.op_flags = WRITE_SYNC | REQ_META | REQ_PRIO,
 		.blk_addr = page->index,
 		.page = page,
 		.encrypted_page = NULL,
diff --git a/fs/f2fs/trace.c b/fs/f2fs/trace.c
index 145fb65..5b7edca 100644
--- a/fs/f2fs/trace.c
+++ b/fs/f2fs/trace.c
@@ -25,11 +25,12 @@ static inline void __print_last_io(void)
 	if (!last_io.len)
 		return;
 
-	trace_printk("%3x:%3x %4x %-16s %2x %5x %12x %4x\n",
+	trace_printk("%3x:%3x %4x %-16s %2x %5x %5x %12x %4x\n",
 			last_io.major, last_io.minor,
 			last_io.pid, "----------------",
 			last_io.type,
-			last_io.fio.rw, last_io.fio.blk_addr,
+			last_io.fio.op, last_io.fio.op_flags,
+			last_io.fio.blk_addr,
 			last_io.len);
 	memset(&last_io, 0, sizeof(last_io));
 }
@@ -100,7 +101,8 @@ void f2fs_trace_ios(struct f2fs_io_info *fio, int flush)
 	if (last_io.major == major && last_io.minor == minor &&
 			last_io.pid == pid &&
 			last_io.type == __file_type(inode, pid) &&
-			last_io.fio.rw == fio->rw &&
+			last_io.fio.op == fio->op &&
+			last_io.fio.op_flags == fio->op_flags &&
 			last_io.fio.blk_addr + last_io.len == fio->blk_addr) {
 		last_io.len++;
 		return;
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index a019465..0c7301b 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -55,17 +55,21 @@ TRACE_DEFINE_ENUM(CP_DISCARD);
 		{ IPU,		"IN-PLACE" },				\
 		{ OPU,		"OUT-OF-PLACE" })
 
-#define F2FS_BIO_MASK(t)	(t & (READA | WRITE_FLUSH_FUA))
+#define F2FS_BIO_FLAG_MASK(t)	(t & (READA | WRITE_FLUSH_FUA))
 #define F2FS_BIO_EXTRA_MASK(t)	(t & (REQ_META | REQ_PRIO))
 
-#define show_bio_type(type)	show_bio_base(type), show_bio_extra(type)
+#define show_bio_type(op, op_flags) show_bio_op(op), 			\
+			show_bio_op_flags(op_flags), show_bio_extra(op_flags)
 
-#define show_bio_base(type)						\
-	__print_symbolic(F2FS_BIO_MASK(type),				\
+#define show_bio_op(op)							\
+	__print_symbolic(op,						\
 		{ READ, 		"READ" },			\
+		{ WRITE, 		"WRITE" })
+
+#define show_bio_op_flags(flags)					\
+	__print_symbolic(F2FS_BIO_FLAG_MASK(flags),			\
 		{ READA, 		"READAHEAD" },			\
 		{ READ_SYNC, 		"READ_SYNC" },			\
-		{ WRITE, 		"WRITE" },			\
 		{ WRITE_SYNC, 		"WRITE_SYNC" },			\
 		{ WRITE_FLUSH,		"WRITE_FLUSH" },		\
 		{ WRITE_FUA, 		"WRITE_FUA" },			\
@@ -700,7 +704,8 @@ DECLARE_EVENT_CLASS(f2fs__submit_page_bio,
 		__field(ino_t, ino)
 		__field(pgoff_t, index)
 		__field(block_t, blkaddr)
-		__field(int, rw)
+		__field(int, op)
+		__field(int, op_flags)
 		__field(int, type)
 	),
 
@@ -709,16 +714,17 @@ DECLARE_EVENT_CLASS(f2fs__submit_page_bio,
 		__entry->ino		= page->mapping->host->i_ino;
 		__entry->index		= page->index;
 		__entry->blkaddr	= fio->blk_addr;
-		__entry->rw		= fio->rw;
+		__entry->op		= fio->op;
+		__entry->op_flags	= fio->op_flags;
 		__entry->type		= fio->type;
 	),
 
 	TP_printk("dev = (%d,%d), ino = %lu, page_index = 0x%lx, "
-		"blkaddr = 0x%llx, rw = %s%s, type = %s",
+		"blkaddr = 0x%llx, rw = %s%s%s, type = %s",
 		show_dev_ino(__entry),
 		(unsigned long)__entry->index,
 		(unsigned long long)__entry->blkaddr,
-		show_bio_type(__entry->rw),
+		show_bio_type(__entry->op, __entry->op_flags),
 		show_block_type(__entry->type))
 );
 
@@ -749,7 +755,8 @@ DECLARE_EVENT_CLASS(f2fs__submit_bio,
 
 	TP_STRUCT__entry(
 		__field(dev_t,	dev)
-		__field(int,	rw)
+		__field(int,	op)
+		__field(int,	op_flags)
 		__field(int,	type)
 		__field(sector_t,	sector)
 		__field(unsigned int,	size)
@@ -757,15 +764,16 @@ DECLARE_EVENT_CLASS(f2fs__submit_bio,
 
 	TP_fast_assign(
 		__entry->dev		= sb->s_dev;
-		__entry->rw		= fio->rw;
+		__entry->op		= fio->op;
+		__entry->op_flags	= fio->op_flags;
 		__entry->type		= fio->type;
 		__entry->sector		= bio->bi_iter.bi_sector;
 		__entry->size		= bio->bi_iter.bi_size;
 	),
 
-	TP_printk("dev = (%d,%d), %s%s, %s, sector = %lld, size = %u",
+	TP_printk("dev = (%d,%d), %s%s%s, %s, sector = %lld, size = %u",
 		show_dev(__entry),
-		show_bio_type(__entry->rw),
+		show_bio_type(__entry->op, __entry->op_flags),
 		show_block_type(__entry->type),
 		(unsigned long long)__entry->sector,
 		__entry->size)
-- 
1.8.3.1

[PATCH 11/32] gfs2: prepare for bi_rw split

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch prepares gfs2's submit_bio use for the next
patches that split bi_rw into a operation and flags field.
Instead of passing in a bitmap with both the operation and
flags mixed in, the callers will now pass them in seperately.

This patch modifies the code related to the submit_bio calls
so the flags and operation are seperated. When this is done
for all code, one of the later patches in the series will
the actual submit_bio call, so the patches are bisectable.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 fs/gfs2/log.c  |  8 ++++----
 fs/gfs2/lops.c | 11 ++++++-----
 fs/gfs2/lops.h |  2 +-
 3 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 536e7a6..8324af5 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -657,7 +657,7 @@ static void log_write_header(struct gfs2_sbd *sdp, u32 flags)
 	struct gfs2_log_header *lh;
 	unsigned int tail;
 	u32 hash;
-	int rw = WRITE_FLUSH_FUA | REQ_META;
+	int op_flags = WRITE_FLUSH_FUA | REQ_META;
 	struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
 	enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
 	lh = page_address(page);
@@ -682,12 +682,12 @@ static void log_write_header(struct gfs2_sbd *sdp, u32 flags)
 	if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) {
 		gfs2_ordered_wait(sdp);
 		log_flush_wait(sdp);
-		rw = WRITE_SYNC | REQ_META | REQ_PRIO;
+		op_flags = WRITE_SYNC | REQ_META | REQ_PRIO;
 	}
 
 	sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
 	gfs2_log_write_page(sdp, page);
-	gfs2_log_flush_bio(sdp, rw);
+	gfs2_log_flush_bio(sdp, REQ_OP_WRITE, op_flags);
 	log_flush_wait(sdp);
 
 	if (sdp->sd_log_tail != tail)
@@ -735,7 +735,7 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl,
 
 	gfs2_ordered_write(sdp);
 	lops_before_commit(sdp, tr);
-	gfs2_log_flush_bio(sdp, WRITE);
+	gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
 
 	if (sdp->sd_log_head != sdp->sd_log_flush_head) {
 		log_flush_wait(sdp);
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index d5369a1..36b047a 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -230,17 +230,18 @@ static void gfs2_end_log_write(struct bio *bio)
 /**
  * gfs2_log_flush_bio - Submit any pending log bio
  * @sdp: The superblock
- * @rw: The rw flags
+ * @op: REQ_OP
+ * @op_flags: rq_flag_bits
  *
  * Submit any pending part-built or full bio to the block device. If
  * there is no pending bio, then this is a no-op.
  */
 
-void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int rw)
+void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int op, int op_flags)
 {
 	if (sdp->sd_log_bio) {
 		atomic_inc(&sdp->sd_log_in_flight);
-		submit_bio(rw, sdp->sd_log_bio);
+		submit_bio(op | op_flags, sdp->sd_log_bio);
 		sdp->sd_log_bio = NULL;
 	}
 }
@@ -299,7 +300,7 @@ static struct bio *gfs2_log_get_bio(struct gfs2_sbd *sdp, u64 blkno)
 		nblk >>= sdp->sd_fsb2bb_shift;
 		if (blkno == nblk)
 			return bio;
-		gfs2_log_flush_bio(sdp, WRITE);
+		gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
 	}
 
 	return gfs2_log_alloc_bio(sdp, blkno);
@@ -328,7 +329,7 @@ static void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page,
 	bio = gfs2_log_get_bio(sdp, blkno);
 	ret = bio_add_page(bio, page, size, offset);
 	if (ret == 0) {
-		gfs2_log_flush_bio(sdp, WRITE);
+		gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
 		bio = gfs2_log_alloc_bio(sdp, blkno);
 		ret = bio_add_page(bio, page, size, offset);
 		WARN_ON(ret == 0);
diff --git a/fs/gfs2/lops.h b/fs/gfs2/lops.h
index a65a7ba..e529f53 100644
--- a/fs/gfs2/lops.h
+++ b/fs/gfs2/lops.h
@@ -27,7 +27,7 @@ extern const struct gfs2_log_operations gfs2_databuf_lops;
 
 extern const struct gfs2_log_operations *gfs2_log_ops[];
 extern void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page);
-extern void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int rw);
+extern void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int op, int op_flags);
 extern void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh);
 
 static inline unsigned int buf_limit(struct gfs2_sbd *sdp)
-- 
1.8.3.1

[PATCH 12/32] xfs: prepare for bi_rw split

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch prepares xfs's submit_bio use for the next
patches that split bi_rw into a operation and flags field.
Instead of passing in a bitmap with both the operation and
flags mixed in, the callers will now pass them in seperately.

This patch modifies the code related to the submit_bio calls
so the flags and operation are seperated. When this is done
for all code, one of the later patches in the series will
the actual submit_bio call, so the patches are bisectable.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 fs/xfs/xfs_buf.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 8ecffb3..0621d70 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -1123,7 +1123,8 @@ xfs_buf_ioapply_map(
 	int		map,
 	int		*buf_offset,
 	int		*count,
-	int		rw)
+	int		op,
+	int		op_flags)
 {
 	int		page_index;
 	int		total_nr_pages = bp->b_page_count;
@@ -1186,7 +1187,7 @@ next_chunk:
 			flush_kernel_vmap_range(bp->b_addr,
 						xfs_buf_vmap_len(bp));
 		}
-		submit_bio(rw, bio);
+		submit_bio(op | op_flags, bio);
 		if (size)
 			goto next_chunk;
 	} else {
@@ -1206,7 +1207,8 @@ _xfs_buf_ioapply(
 	struct xfs_buf	*bp)
 {
 	struct blk_plug	plug;
-	int		rw;
+	int		op;
+	int		op_flags = 0;
 	int		offset;
 	int		size;
 	int		i;
@@ -1225,14 +1227,13 @@ _xfs_buf_ioapply(
 		bp->b_ioend_wq = bp->b_target->bt_mount->m_buf_workqueue;
 
 	if (bp->b_flags & XBF_WRITE) {
+		op = REQ_OP_WRITE;
 		if (bp->b_flags & XBF_SYNCIO)
-			rw = WRITE_SYNC;
-		else
-			rw = WRITE;
+			op_flags = WRITE_SYNC;
 		if (bp->b_flags & XBF_FUA)
-			rw |= REQ_FUA;
+			op_flags |= REQ_FUA;
 		if (bp->b_flags & XBF_FLUSH)
-			rw |= REQ_FLUSH;
+			op_flags |= REQ_FLUSH;
 
 		/*
 		 * Run the write verifier callback function if it exists. If
@@ -1262,13 +1263,14 @@ _xfs_buf_ioapply(
 			}
 		}
 	} else if (bp->b_flags & XBF_READ_AHEAD) {
-		rw = READA;
+		op = REQ_OP_READ;
+		op_flags = REQ_RAHEAD;
 	} else {
-		rw = READ;
+		op = REQ_OP_READ;
 	}
 
 	/* we only use the buffer cache for meta-data */
-	rw |= REQ_META;
+	op_flags |= REQ_META;
 
 	/*
 	 * Walk all the vectors issuing IO on them. Set up the initial offset
@@ -1280,7 +1282,7 @@ _xfs_buf_ioapply(
 	size = BBTOB(bp->b_io_length);
 	blk_start_plug(&plug);
 	for (i = 0; i < bp->b_map_count; i++) {
-		xfs_buf_ioapply_map(bp, i, &offset, &size, rw);
+		xfs_buf_ioapply_map(bp, i, &offset, &size, op, op_flags);
 		if (bp->b_error)
 			break;
 		if (size <= 0)
-- 
1.8.3.1

[PATCH 13/32] mm: prepare for bi_rw split

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch prepares mm's submit_bio use for the next
patches that split bi_rw into a operation and flags field.
Instead of passing in a bitmap with both the operation and
flags mixed in, the callers will now pass them in seperately.

This patch modifies the code related to the submit_bio calls
so the flags and operation are seperated. When this is done
for all code, one of the later patches in the series will
the actual submit_bio call, so the patches are bisectable.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 mm/page_io.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/page_io.c b/mm/page_io.c
index b995a5b..ec7ad22 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -253,7 +253,8 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
 		bio_end_io_t end_write_func)
 {
 	struct bio *bio;
-	int ret, rw = WRITE;
+	int ret;
+	u32 op_flags = 0;
 	struct swap_info_struct *sis = page_swap_info(page);
 
 	if (sis->flags & SWP_FILE) {
@@ -312,11 +313,11 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
 		goto out;
 	}
 	if (wbc->sync_mode == WB_SYNC_ALL)
-		rw |= REQ_SYNC;
+		op_flags |= REQ_SYNC;
 	count_vm_event(PSWPOUT);
 	set_page_writeback(page);
 	unlock_page(page);
-	submit_bio(rw, bio);
+	submit_bio(REQ_OP_WRITE | op_flags, bio);
 out:
 	return ret;
 }
-- 
1.8.3.1

[PATCH 14/32] block/fs/mm: pass in op and flags to submit_bio

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch prepares submit_bio callers for the next
patches that split bi_rw into a operation and flags field.
Instead of passing in a bitmap with both the operation and
flags mixed in, the callers now pass them in seperately.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 block/bio.c                         |  2 +-
 block/blk-core.c                    | 13 +++++++------
 block/blk-lib.c                     | 11 ++++++++---
 drivers/block/drbd/drbd_actlog.c    |  2 +-
 drivers/block/drbd/drbd_bitmap.c    |  2 +-
 drivers/block/floppy.c              |  2 +-
 drivers/block/xen-blkback/blkback.c |  2 +-
 drivers/block/xen-blkfront.c        |  4 ++--
 drivers/md/bcache/journal.c         |  2 +-
 drivers/md/bcache/super.c           |  2 +-
 drivers/md/dm-bufio.c               |  2 +-
 drivers/md/dm-io.c                  |  2 +-
 drivers/md/dm-log-writes.c          |  6 +++---
 drivers/md/dm-thin.c                |  2 +-
 drivers/md/md.c                     |  4 ++--
 drivers/target/target_core_iblock.c |  4 ++--
 fs/btrfs/check-integrity.c          |  2 +-
 fs/btrfs/raid56.c                   | 10 +++++-----
 fs/buffer.c                         |  7 ++++---
 fs/direct-io.c                      |  2 +-
 fs/ext4/page-io.c                   |  6 +++---
 fs/ext4/readpage.c                  |  8 ++++----
 fs/f2fs/data.c                      | 10 +++++-----
 fs/gfs2/lops.c                      |  2 +-
 fs/gfs2/ops_fstype.c                |  2 +-
 fs/jfs/jfs_logmgr.c                 |  4 ++--
 fs/jfs/jfs_metapage.c               |  8 ++++----
 fs/logfs/dev_bdev.c                 |  8 ++++----
 fs/mpage.c                          |  2 +-
 fs/nfs/blocklayout/blocklayout.c    |  2 +-
 fs/nilfs2/segbuf.c                  |  2 +-
 fs/ocfs2/cluster/heartbeat.c        |  4 ++--
 fs/xfs/xfs_aops.c                   |  3 ++-
 fs/xfs/xfs_buf.c                    |  2 +-
 include/linux/fs.h                  |  2 +-
 kernel/power/swap.c                 |  2 +-
 mm/page_io.c                        |  4 ++--
 37 files changed, 81 insertions(+), 73 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index 610c704..ae91ccb 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -873,7 +873,7 @@ int submit_bio_wait(int op, int flags, struct bio *bio)
 	init_completion(&ret.event);
 	bio->bi_private = &ret;
 	bio->bi_end_io = submit_bio_wait_endio;
-	submit_bio(op | flags | REQ_SYNC, bio);
+	submit_bio(op, flags | REQ_SYNC, bio);
 	wait_for_completion(&ret.event);
 
 	return ret.error;
diff --git a/block/blk-core.c b/block/blk-core.c
index 18e92a6..d325ece 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1976,7 +1976,8 @@ EXPORT_SYMBOL(generic_make_request);
 
 /**
  * submit_bio - submit a bio to the block device layer for I/O
- * @rw: whether to %READ or %WRITE, or maybe to %READA (read ahead)
+ * @op: REQ_OP_*
+ * @flags: rq_flag_bits
  * @bio: The &struct bio which describes the I/O
  *
  * submit_bio() is very similar in purpose to generic_make_request(), and
@@ -1984,9 +1985,9 @@ EXPORT_SYMBOL(generic_make_request);
  * interfaces; @bio must be presetup and ready for I/O.
  *
  */
-void submit_bio(int rw, struct bio *bio)
+void submit_bio(int op, int flags, struct bio *bio)
 {
-	bio->bi_rw |= rw;
+	bio->bi_rw |= op | flags;
 
 	/*
 	 * If it's a regular read/write or a barrier with data attached,
@@ -1995,12 +1996,12 @@ void submit_bio(int rw, struct bio *bio)
 	if (bio_has_data(bio)) {
 		unsigned int count;
 
-		if (unlikely(rw & REQ_WRITE_SAME))
+		if (unlikely(op == REQ_WRITE_SAME))
 			count = bdev_logical_block_size(bio->bi_bdev) >> 9;
 		else
 			count = bio_sectors(bio);
 
-		if (rw & WRITE) {
+		if (op == REQ_OP_WRITE) {
 			count_vm_events(PGPGOUT, count);
 		} else {
 			task_io_account_read(bio->bi_iter.bi_size);
@@ -2011,7 +2012,7 @@ void submit_bio(int rw, struct bio *bio)
 			char b[BDEVNAME_SIZE];
 			printk(KERN_DEBUG "%s(%d): %s block %Lu on %s (%u sectors)\n",
 			current->comm, task_pid_nr(current),
-				(rw & WRITE) ? "WRITE" : "READ",
+				bio_rw(bio) ? "WRITE" : "READ",
 				(unsigned long long)bio->bi_iter.bi_sector,
 				bdevname(bio->bi_bdev, b),
 				count);
diff --git a/block/blk-lib.c b/block/blk-lib.c
index 0861c7a..49786b0 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -109,7 +109,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
 		sector = end_sect;
 
 		atomic_inc(&bb.done);
-		submit_bio(op | op_flags, bio);
+		submit_bio(op, op_flags, bio);
 
 		/*
 		 * We can loop for a long time in here, if someone does
@@ -189,7 +189,12 @@ int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
 		}
 
 		atomic_inc(&bb.done);
-		submit_bio(REQ_WRITE | REQ_WRITE_SAME, bio);
+		/*
+		 * REQ_WRITE being passed as a flag is temp until
+		 * code that assumes REQ_WRITE is set for WRITE_SAME
+		 * is converted.
+		 */
+		submit_bio(REQ_OP_WRITE_SAME, REQ_WRITE, bio);
 	}
 
 	/* Wait for bios in-flight */
@@ -250,7 +255,7 @@ static int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
 		}
 		ret = 0;
 		atomic_inc(&bb.done);
-		submit_bio(WRITE, bio);
+		submit_bio(REQ_OP_WRITE, 0, bio);
 	}
 
 	/* Wait for bios in-flight */
diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index c290e8b..5ad6b09 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -177,7 +177,7 @@ static int _drbd_md_sync_page_io(struct drbd_device *device,
 	if (drbd_insert_fault(device, (op == REQ_OP_WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD))
 		bio_io_error(bio);
 	else
-		submit_bio(op | op_flags, bio);
+		submit_bio(op, op_flags, bio);
 	wait_until_done_or_force_detached(device, bdev, &device->md_io.done);
 	if (!bio->bi_error)
 		err = device->md_io.error;
diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index 7ea1502..e8c65a4 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -1024,7 +1024,7 @@ static void bm_page_io_async(struct drbd_bm_aio_ctx *ctx, int page_nr) __must_ho
 		bio->bi_rw |= rw;
 		bio_io_error(bio);
 	} else {
-		submit_bio(rw, bio);
+		submit_bio(rw, 0, bio);
 		/* this should not count as user activity and cause the
 		 * resync to throttle -- see drbd_rs_should_slow_down(). */
 		atomic_add(len >> 9, &device->rs_sect_ev);
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 331363e..86758fa 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -3817,7 +3817,7 @@ static int __floppy_read_block_0(struct block_device *bdev, int drive)
 	bio.bi_private = &cbdata;
 	bio.bi_end_io = floppy_rb0_cb;
 
-	submit_bio(READ, &bio);
+	submit_bio(REQ_OP_READ, 0, &bio);
 	process_fd_request();
 
 	init_completion(&cbdata.complete);
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index bfffab3..0ae456c 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -1368,7 +1368,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
 	blk_start_plug(&plug);
 
 	for (i = 0; i < nbio; i++)
-		submit_bio(operation | operation_flags, biolist[i]);
+		submit_bio(operation, operation_flags, biolist[i]);
 
 	/* Let the I/Os go.. */
 	blk_finish_plug(&plug);
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index a69c02d..ec76178 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1591,7 +1591,7 @@ static int blkif_recover(struct blkfront_info *info)
 				bio_trim(cloned_bio, offset, size);
 				cloned_bio->bi_private = split_bio;
 				cloned_bio->bi_end_io = split_bio_end;
-				submit_bio(cloned_bio->bi_rw, cloned_bio);
+				submit_bio(cloned_bio->bi_rw, 0, cloned_bio);
 			}
 			/*
 			 * Now we have to wait for all those smaller bios to
@@ -1600,7 +1600,7 @@ static int blkif_recover(struct blkfront_info *info)
 			continue;
 		}
 		/* We don't need to split this bio */
-		submit_bio(bio->bi_rw, bio);
+		submit_bio(bio->bi_rw, 0, bio);
 	}
 
 	return 0;
diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index 29eba72..ba9192b 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -418,7 +418,7 @@ static void journal_discard_work(struct work_struct *work)
 	struct journal_device *ja =
 		container_of(work, struct journal_device, discard_work);
 
-	submit_bio(0, &ja->discard_bio);
+	submit_bio(0, 0, &ja->discard_bio);
 }
 
 static void do_journal_discard(struct cache *ca)
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 679a093..a987c90 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -238,7 +238,7 @@ static void __write_super(struct cache_sb *sb, struct bio *bio)
 	pr_debug("ver %llu, flags %llu, seq %llu",
 		 sb->version, sb->flags, sb->seq);
 
-	submit_bio(REQ_WRITE, bio);
+	submit_bio(REQ_OP_WRITE, 0, bio);
 }
 
 static void bch_write_bdev_super_unlock(struct closure *cl)
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index 9d5ef0c..689e908 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -641,7 +641,7 @@ static void use_inline_bio(struct dm_buffer *b, int rw, sector_t block,
 		ptr += PAGE_SIZE;
 	} while (len > 0);
 
-	submit_bio(rw, &b->bio);
+	submit_bio(rw, 0, &b->bio);
 }
 
 static void submit_io(struct dm_buffer *b, int rw, sector_t block,
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index 6479096..f389380 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -358,7 +358,7 @@ static void do_region(int op, int op_flags, unsigned region,
 		}
 
 		atomic_inc(&io->count);
-		submit_bio(op | op_flags, bio);
+		submit_bio(op, op_flags, bio);
 	} while (remaining);
 }
 
diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index b2912db..7bfaa91 100644
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -226,7 +226,7 @@ static int write_metadata(struct log_writes_c *lc, void *entry,
 		DMERR("Couldn't add page to the log block");
 		goto error_bio;
 	}
-	submit_bio(WRITE, bio);
+	submit_bio(REQ_OP_WRITE, 0, bio);
 	return 0;
 error_bio:
 	bio_put(bio);
@@ -279,7 +279,7 @@ static int log_one_block(struct log_writes_c *lc,
 				   block->vecs[i].bv_len, 0);
 		if (ret != block->vecs[i].bv_len) {
 			atomic_inc(&lc->io_blocks);
-			submit_bio(WRITE, bio);
+			submit_bio(REQ_OP_WRITE, 0, bio);
 			bio = bio_alloc(GFP_KERNEL, block->vec_cnt - i);
 			if (!bio) {
 				DMERR("Couldn't alloc log bio");
@@ -301,7 +301,7 @@ static int log_one_block(struct log_writes_c *lc,
 		}
 		sector += block->vecs[i].bv_len >> SECTOR_SHIFT;
 	}
-	submit_bio(WRITE, bio);
+	submit_bio(REQ_OP_WRITE, 0, bio);
 out:
 	kfree(block->data);
 	kfree(block);
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 1500582..63a713d 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -366,7 +366,7 @@ static int __blkdev_issue_discard_async(struct block_device *bdev, sector_t sect
 	bio->bi_bdev = bdev;
 	bio->bi_iter.bi_size = nr_sects << 9;
 
-	submit_bio(REQ_OP_DISCARD | op_flags, bio);
+	submit_bio(REQ_OP_DISCARD, op_flags, bio);
 
 	return 0;
 }
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 1ca5959..650d668 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -398,7 +398,7 @@ static void submit_flushes(struct work_struct *ws)
 			bi->bi_private = rdev;
 			bi->bi_bdev = rdev->bdev;
 			atomic_inc(&mddev->flush_pending);
-			submit_bio(WRITE_FLUSH, bi);
+			submit_bio(REQ_OP_WRITE, WRITE_FLUSH, bi);
 			rcu_read_lock();
 			rdev_dec_pending(rdev, mddev);
 		}
@@ -745,7 +745,7 @@ void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
 	bio->bi_end_io = super_written;
 
 	atomic_inc(&mddev->pending_writes);
-	submit_bio(WRITE_FLUSH_FUA, bio);
+	submit_bio(REQ_OP_WRITE, WRITE_FLUSH_FUA, bio);
 }
 
 void md_super_wait(struct mddev *mddev)
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index 25f75ab..3df7921 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -361,7 +361,7 @@ static void iblock_submit_bios(struct bio_list *list, int op, int op_flags)
 
 	blk_start_plug(&plug);
 	while ((bio = bio_list_pop(list)))
-		submit_bio(op | op_flags, bio);
+		submit_bio(op, op_flags, bio);
 	blk_finish_plug(&plug);
 }
 
@@ -405,7 +405,7 @@ iblock_execute_sync_cache(struct se_cmd *cmd)
 	bio->bi_bdev = ib_dev->ibd_bd;
 	if (!immed)
 		bio->bi_private = cmd;
-	submit_bio(WRITE_FLUSH, bio);
+	submit_bio(REQ_OP_WRITE, WRITE_FLUSH, bio);
 	return 0;
 }
 
diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
index 515a92e..a5ff6e4 100644
--- a/fs/btrfs/check-integrity.c
+++ b/fs/btrfs/check-integrity.c
@@ -3061,7 +3061,7 @@ leave:
 void btrfsic_submit_bio(int op, int op_flags, struct bio *bio)
 {
 	__btrfsic_submit_bio(op | op_flags, bio);
-	submit_bio(op | op_flags, bio);
+	submit_bio(op, op_flags, bio);
 }
 
 int btrfsic_submit_bio_wait(int op, int op_flags, struct bio *bio)
diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
index fcf7265..dd1c7b0 100644
--- a/fs/btrfs/raid56.c
+++ b/fs/btrfs/raid56.c
@@ -1319,7 +1319,7 @@ write_data:
 
 		bio->bi_private = rbio;
 		bio->bi_end_io = raid_write_end_io;
-		submit_bio(WRITE, bio);
+		submit_bio(REQ_OP_WRITE, 0, bio);
 	}
 	return;
 
@@ -1577,7 +1577,7 @@ static int raid56_rmw_stripe(struct btrfs_raid_bio *rbio)
 		btrfs_bio_wq_end_io(rbio->fs_info, bio,
 				    BTRFS_WQ_ENDIO_RAID56);
 
-		submit_bio(READ, bio);
+		submit_bio(REQ_OP_READ, 0, bio);
 	}
 	/* the actual write will happen once the reads are done */
 	return 0;
@@ -2103,7 +2103,7 @@ static int __raid56_parity_recover(struct btrfs_raid_bio *rbio)
 		btrfs_bio_wq_end_io(rbio->fs_info, bio,
 				    BTRFS_WQ_ENDIO_RAID56);
 
-		submit_bio(READ, bio);
+		submit_bio(REQ_OP_READ, 0, bio);
 	}
 out:
 	return 0;
@@ -2461,7 +2461,7 @@ submit_write:
 
 		bio->bi_private = rbio;
 		bio->bi_end_io = raid_write_parity_end_io;
-		submit_bio(WRITE, bio);
+		submit_bio(REQ_OP_WRITE, 0, bio);
 	}
 	return;
 
@@ -2642,7 +2642,7 @@ static void raid56_parity_scrub_stripe(struct btrfs_raid_bio *rbio)
 		btrfs_bio_wq_end_io(rbio->fs_info, bio,
 				    BTRFS_WQ_ENDIO_RAID56);
 
-		submit_bio(READ, bio);
+		submit_bio(REQ_OP_READ, 0, bio);
 	}
 	/* the actual write will happen once the reads are done */
 	return;
diff --git a/fs/buffer.c b/fs/buffer.c
index 82283ab..a190c25 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -3020,6 +3020,7 @@ static int submit_bh_wbc(int rw, struct buffer_head *bh,
 			 unsigned long bio_flags, struct writeback_control *wbc)
 {
 	struct bio *bio;
+	int op_flags = 0;
 
 	BUG_ON(!buffer_locked(bh));
 	BUG_ON(!buffer_mapped(bh));
@@ -3058,11 +3059,11 @@ static int submit_bh_wbc(int rw, struct buffer_head *bh,
 	guard_bio_eod(rw, bio);
 
 	if (buffer_meta(bh))
-		rw |= REQ_META;
+		op_flags |= REQ_META;
 	if (buffer_prio(bh))
-		rw |= REQ_PRIO;
+		op_flags |= REQ_PRIO;
 
-	submit_bio(rw, bio);
+	submit_bio(rw, op_flags, bio);
 	return 0;
 }
 
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 5e1b1a0..c72e9f4 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -402,7 +402,7 @@ static inline void dio_bio_submit(struct dio *dio, struct dio_submit *sdio)
 		sdio->submit_io(dio->op, dio->op_flags, bio, dio->inode,
 			       sdio->logical_offset_in_bio);
 	else
-		submit_bio(dio->op | dio->op_flags, bio);
+		submit_bio(dio->op, dio->op_flags, bio);
 
 	sdio->bio = NULL;
 	sdio->boundary = 0;
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 84ba4d2..4eb8fd9 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -354,10 +354,10 @@ void ext4_io_submit(struct ext4_io_submit *io)
 	struct bio *bio = io->io_bio;
 
 	if (bio) {
-		int io_op = io->io_wbc->sync_mode == WB_SYNC_ALL ?
-			    WRITE_SYNC : WRITE;
+		int io_op_flags = io->io_wbc->sync_mode == WB_SYNC_ALL ?
+			    WRITE_SYNC : 0;
 		bio_get(io->io_bio);
-		submit_bio(io_op, io->io_bio);
+		submit_bio(REQ_OP_WRITE, io_op_flags, io->io_bio);
 		bio_put(io->io_bio);
 	}
 	io->io_bio = NULL;
diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
index 560af04..ac67d0f 100644
--- a/fs/ext4/readpage.c
+++ b/fs/ext4/readpage.c
@@ -271,7 +271,7 @@ int ext4_mpage_readpages(struct address_space *mapping,
 		 */
 		if (bio && (last_block_in_bio != blocks[0] - 1)) {
 		submit_and_realloc:
-			submit_bio(READ, bio);
+			submit_bio(REQ_OP_READ, 0, bio);
 			bio = NULL;
 		}
 		if (bio == NULL) {
@@ -303,14 +303,14 @@ int ext4_mpage_readpages(struct address_space *mapping,
 		if (((map.m_flags & EXT4_MAP_BOUNDARY) &&
 		     (relative_block == map.m_len)) ||
 		    (first_hole != blocks_per_page)) {
-			submit_bio(READ, bio);
+			submit_bio(REQ_OP_READ, 0, bio);
 			bio = NULL;
 		} else
 			last_block_in_bio = blocks[blocks_per_page - 1];
 		goto next_page;
 	confused:
 		if (bio) {
-			submit_bio(READ, bio);
+			submit_bio(REQ_OP_READ, 0, bio);
 			bio = NULL;
 		}
 		if (!PageUptodate(page))
@@ -323,6 +323,6 @@ int ext4_mpage_readpages(struct address_space *mapping,
 	}
 	BUG_ON(pages && !list_empty(pages));
 	if (bio)
-		submit_bio(READ, bio);
+		submit_bio(REQ_OP_READ, 0, bio);
 	return 0;
 }
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index fb767e4f..94b090d 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -112,7 +112,7 @@ static void __submit_merged_bio(struct f2fs_bio_info *io)
 	else
 		trace_f2fs_submit_write_bio(io->sbi->sb, fio, io->bio);
 
-	submit_bio(fio->op | fio->op_flags, io->bio);
+	submit_bio(fio->op, fio->op_flags, io->bio);
 	io->bio = NULL;
 }
 
@@ -160,7 +160,7 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio)
 		return -EFAULT;
 	}
 
-	submit_bio(fio->op | fio->op_flags, bio);
+	submit_bio(fio->op, fio->op_flags, bio);
 	return 0;
 }
 
@@ -932,7 +932,7 @@ got_it:
 		 */
 		if (bio && (last_block_in_bio != block_nr - 1)) {
 submit_and_realloc:
-			submit_bio(READ, bio);
+			submit_bio(REQ_OP_READ, 0, bio);
 			bio = NULL;
 		}
 		if (bio == NULL) {
@@ -982,7 +982,7 @@ set_error_page:
 		goto next_page;
 confused:
 		if (bio) {
-			submit_bio(READ, bio);
+			submit_bio(REQ_OP_READ, 0, bio);
 			bio = NULL;
 		}
 		unlock_page(page);
@@ -992,7 +992,7 @@ next_page:
 	}
 	BUG_ON(pages && !list_empty(pages));
 	if (bio)
-		submit_bio(READ, bio);
+		submit_bio(REQ_OP_READ, 0, bio);
 	return 0;
 }
 
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index 36b047a..8a230d1 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -241,7 +241,7 @@ void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int op, int op_flags)
 {
 	if (sdp->sd_log_bio) {
 		atomic_inc(&sdp->sd_log_in_flight);
-		submit_bio(op | op_flags, sdp->sd_log_bio);
+		submit_bio(op, op_flags, sdp->sd_log_bio);
 		sdp->sd_log_bio = NULL;
 	}
 }
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 02586e7..72c48e2 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -246,7 +246,7 @@ static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
 
 	bio->bi_end_io = end_bio_io_page;
 	bio->bi_private = page;
-	submit_bio(READ_SYNC | REQ_META, bio);
+	submit_bio(REQ_OP_READ, READ_SYNC | REQ_META, bio);
 	wait_on_page_locked(page);
 	bio_put(bio);
 	if (!PageUptodate(page)) {
diff --git a/fs/jfs/jfs_logmgr.c b/fs/jfs/jfs_logmgr.c
index a69bdf2..c8e8176 100644
--- a/fs/jfs/jfs_logmgr.c
+++ b/fs/jfs/jfs_logmgr.c
@@ -2010,7 +2010,7 @@ static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp)
 		bio->bi_iter.bi_size = 0;
 		lbmIODone(bio);
 	} else {
-		submit_bio(READ_SYNC, bio);
+		submit_bio(REQ_OP_READ, READ_SYNC, bio);
 	}
 
 	wait_event(bp->l_ioevent, (bp->l_flag != lbmREAD));
@@ -2154,7 +2154,7 @@ static void lbmStartIO(struct lbuf * bp)
 		bio->bi_iter.bi_size = 0;
 		lbmIODone(bio);
 	} else {
-		submit_bio(WRITE_SYNC, bio);
+		submit_bio(REQ_OP_WRITE, WRITE_SYNC, bio);
 		INCREMENT(lmStat.submitted);
 	}
 }
diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
index a3eb316..fb64488 100644
--- a/fs/jfs/jfs_metapage.c
+++ b/fs/jfs/jfs_metapage.c
@@ -411,7 +411,7 @@ static int metapage_writepage(struct page *page, struct writeback_control *wbc)
 			inc_io(page);
 			if (!bio->bi_iter.bi_size)
 				goto dump_bio;
-			submit_bio(WRITE, bio);
+			submit_bio(REQ_OP_WRITE, 0, bio);
 			nr_underway++;
 			bio = NULL;
 		} else
@@ -448,7 +448,7 @@ static int metapage_writepage(struct page *page, struct writeback_control *wbc)
 		if (!bio->bi_iter.bi_size)
 			goto dump_bio;
 
-		submit_bio(WRITE, bio);
+		submit_bio(REQ_OP_WRITE, 0, bio);
 		nr_underway++;
 	}
 	if (redirty)
@@ -506,7 +506,7 @@ static int metapage_readpage(struct file *fp, struct page *page)
 				insert_metapage(page, NULL);
 			inc_io(page);
 			if (bio)
-				submit_bio(READ, bio);
+				submit_bio(REQ_OP_READ, 0, bio);
 
 			bio = bio_alloc(GFP_NOFS, 1);
 			bio->bi_bdev = inode->i_sb->s_bdev;
@@ -523,7 +523,7 @@ static int metapage_readpage(struct file *fp, struct page *page)
 			block_offset++;
 	}
 	if (bio)
-		submit_bio(READ, bio);
+		submit_bio(REQ_OP_READ, 0, bio);
 	else
 		unlock_page(page);
 
diff --git a/fs/logfs/dev_bdev.c b/fs/logfs/dev_bdev.c
index 149c480..6b1cab9 100644
--- a/fs/logfs/dev_bdev.c
+++ b/fs/logfs/dev_bdev.c
@@ -96,7 +96,7 @@ static int __bdev_writeseg(struct super_block *sb, u64 ofs, pgoff_t index,
 			bio->bi_private = sb;
 			bio->bi_end_io = writeseg_end_io;
 			atomic_inc(&super->s_pending_writes);
-			submit_bio(WRITE, bio);
+			submit_bio(REQ_OP_WRITE, 0, bio);
 
 			ofs += i * PAGE_SIZE;
 			index += i;
@@ -123,7 +123,7 @@ static int __bdev_writeseg(struct super_block *sb, u64 ofs, pgoff_t index,
 	bio->bi_private = sb;
 	bio->bi_end_io = writeseg_end_io;
 	atomic_inc(&super->s_pending_writes);
-	submit_bio(WRITE, bio);
+	submit_bio(REQ_OP_WRITE, 0, bio);
 	return 0;
 }
 
@@ -186,7 +186,7 @@ static int do_erase(struct super_block *sb, u64 ofs, pgoff_t index,
 			bio->bi_private = sb;
 			bio->bi_end_io = erase_end_io;
 			atomic_inc(&super->s_pending_writes);
-			submit_bio(WRITE, bio);
+			submit_bio(REQ_OP_WRITE, 0, bio);
 
 			ofs += i * PAGE_SIZE;
 			index += i;
@@ -207,7 +207,7 @@ static int do_erase(struct super_block *sb, u64 ofs, pgoff_t index,
 	bio->bi_private = sb;
 	bio->bi_end_io = erase_end_io;
 	atomic_inc(&super->s_pending_writes);
-	submit_bio(WRITE, bio);
+	submit_bio(REQ_OP_WRITE, 0, bio);
 	return 0;
 }
 
diff --git a/fs/mpage.c b/fs/mpage.c
index a7c3427..5580c95 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -59,7 +59,7 @@ static struct bio *mpage_bio_submit(int rw, struct bio *bio)
 {
 	bio->bi_end_io = mpage_end_io;
 	guard_bio_eod(rw, bio);
-	submit_bio(rw, bio);
+	submit_bio(rw, 0, bio);
 	return NULL;
 }
 
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 9cd4eb3..6f0a19c 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -109,7 +109,7 @@ bl_submit_bio(int rw, struct bio *bio)
 		dprintk("%s submitting %s bio %u@%llu\n", __func__,
 			rw == READ ? "read" : "write", bio->bi_iter.bi_size,
 			(unsigned long long)bio->bi_iter.bi_sector);
-		submit_bio(rw, bio);
+		submit_bio(rw, 0, bio);
 	}
 	return NULL;
 }
diff --git a/fs/nilfs2/segbuf.c b/fs/nilfs2/segbuf.c
index f63620c..ed7b18f 100644
--- a/fs/nilfs2/segbuf.c
+++ b/fs/nilfs2/segbuf.c
@@ -368,7 +368,7 @@ static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf,
 
 	bio->bi_end_io = nilfs_end_bio_write;
 	bio->bi_private = segbuf;
-	submit_bio(mode, bio);
+	submit_bio(mode, 0, bio);
 	segbuf->sb_nbio++;
 
 	wi->bio = NULL;
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index fa15deb..2d0766c 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -459,7 +459,7 @@ static int o2hb_read_slots(struct o2hb_region *reg,
 		}
 
 		atomic_inc(&wc.wc_num_reqs);
-		submit_bio(READ, bio);
+		submit_bio(REQ_OP_READ, 0, bio);
 	}
 
 	status = 0;
@@ -491,7 +491,7 @@ static int o2hb_issue_node_write(struct o2hb_region *reg,
 	}
 
 	atomic_inc(&write_wc->wc_num_reqs);
-	submit_bio(WRITE_SYNC, bio);
+	submit_bio(REQ_OP_WRITE, WRITE_SYNC, bio);
 
 	status = 0;
 bail:
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 50ab287..4cdd020 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -373,7 +373,8 @@ xfs_submit_ioend_bio(
 	atomic_inc(&ioend->io_remaining);
 	bio->bi_private = ioend;
 	bio->bi_end_io = xfs_end_bio;
-	submit_bio(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE, bio);
+	submit_bio(REQ_OP_WRITE,
+		   wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : 0, bio);
 }
 
 STATIC struct bio *
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 0621d70..a39a397 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -1187,7 +1187,7 @@ next_chunk:
 			flush_kernel_vmap_range(bp->b_addr,
 						xfs_buf_vmap_len(bp));
 		}
-		submit_bio(op | op_flags, bio);
+		submit_bio(op, op_flags, bio);
 		if (size)
 			goto next_chunk;
 	} else {
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 601b842..ac1fd9b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2625,7 +2625,7 @@ static inline void remove_inode_hash(struct inode *inode)
 extern void inode_sb_list_add(struct inode *inode);
 
 #ifdef CONFIG_BLOCK
-extern void submit_bio(int, struct bio *);
+extern void submit_bio(int, int, struct bio *);
 extern int bdev_read_only(struct block_device *);
 #endif
 extern int set_blocksize(struct block_device *, int);
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index aa4ca997..0fea79b 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -272,7 +272,7 @@ static int hib_submit_io(int rw, int flags, pgoff_t page_off, void *addr,
 		bio->bi_end_io = hib_end_io;
 		bio->bi_private = hb;
 		atomic_inc(&hb->count);
-		submit_bio(rw, bio);
+		submit_bio(rw, flags, bio);
 	} else {
 		error = submit_bio_wait(rw, flags, bio);
 		bio_put(bio);
diff --git a/mm/page_io.c b/mm/page_io.c
index ec7ad22..bde21e3 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -317,7 +317,7 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
 	count_vm_event(PSWPOUT);
 	set_page_writeback(page);
 	unlock_page(page);
-	submit_bio(REQ_OP_WRITE | op_flags, bio);
+	submit_bio(REQ_OP_WRITE, op_flags, bio);
 out:
 	return ret;
 }
@@ -360,7 +360,7 @@ int swap_readpage(struct page *page)
 		goto out;
 	}
 	count_vm_event(PSWPIN);
-	submit_bio(READ, bio);
+	submit_bio(REQ_OP_READ, 0, bio);
 out:
 	return ret;
 }
-- 
1.8.3.1

[PATCH 15/32] btrfs: prepare for bi_rw split

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch prepares btrfs's submit_bh use for the next
patches that split bi_rw into a operation and flags field.
Instead of passing in a bitmap with both the operation and
flags mixed in, the callers will now pass them in seperately.

This patch modifies the code related to the submit_bh calls
so the flags and operation are seperated. When this is done
for all code, one of the later patches in the series will
the actual submit_bh call, so the patches are bisectable.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 fs/btrfs/check-integrity.c | 68 ++++++++++++++++++++++++++--------------------
 fs/btrfs/check-integrity.h |  2 +-
 fs/btrfs/disk-io.c         |  4 +--
 3 files changed, 41 insertions(+), 33 deletions(-)

diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
index a5ff6e4..17eba2d 100644
--- a/fs/btrfs/check-integrity.c
+++ b/fs/btrfs/check-integrity.c
@@ -168,7 +168,8 @@ struct btrfsic_block {
 		bio_end_io_t *bio;
 		bh_end_io_t *bh;
 	} orig_bio_bh_end_io;
-	int submit_bio_bh_rw;
+	int submit_bio_bh_op;
+	int submit_bio_bh_op_flags;
 	u64 flush_gen; /* only valid if !never_written */
 };
 
@@ -338,7 +339,8 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
 					  unsigned int num_pages,
 					  struct bio *bio, int *bio_is_patched,
 					  struct buffer_head *bh,
-					  int submit_bio_bh_rw);
+					  int submit_bio_bh_op,
+					  int submit_bio_bh_op_flags);
 static int btrfsic_process_written_superblock(
 		struct btrfsic_state *state,
 		struct btrfsic_block *const block,
@@ -418,7 +420,8 @@ static void btrfsic_block_init(struct btrfsic_block *b)
 	INIT_LIST_HEAD(&b->all_blocks_node);
 	INIT_LIST_HEAD(&b->ref_to_list);
 	INIT_LIST_HEAD(&b->ref_from_list);
-	b->submit_bio_bh_rw = 0;
+	b->submit_bio_bh_op = 0;
+	b->submit_bio_bh_op_flags = 0;
 	b->flush_gen = 0;
 }
 
@@ -1820,7 +1823,8 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
 					  unsigned int num_pages,
 					  struct bio *bio, int *bio_is_patched,
 					  struct buffer_head *bh,
-					  int submit_bio_bh_rw)
+					  int submit_bio_bh_op,
+					  int submit_bio_bh_op_flags)
 {
 	int is_metadata;
 	struct btrfsic_block *block;
@@ -2038,7 +2042,8 @@ again:
 		}
 
 		block->flush_gen = dev_state->last_flush_gen + 1;
-		block->submit_bio_bh_rw = submit_bio_bh_rw;
+		block->submit_bio_bh_op = submit_bio_bh_op;
+		block->submit_bio_bh_op_flags = submit_bio_bh_op_flags;
 		if (is_metadata) {
 			block->logical_bytenr = bytenr;
 			block->is_metadata = 1;
@@ -2141,7 +2146,8 @@ again:
 		block->iodone_w_error = 0;
 		block->mirror_num = 0;	/* unknown */
 		block->flush_gen = dev_state->last_flush_gen + 1;
-		block->submit_bio_bh_rw = submit_bio_bh_rw;
+		block->submit_bio_bh_op = submit_bio_bh_op;
+		block->submit_bio_bh_op_flags = submit_bio_bh_op_flags;
 		if (NULL != bio) {
 			block->is_iodone = 0;
 			BUG_ON(NULL == bio_is_patched);
@@ -2236,7 +2242,7 @@ static void btrfsic_bio_end_io(struct bio *bp)
 			       block->dev_bytenr, block->mirror_num);
 		next_block = block->next_in_same_bio;
 		block->iodone_w_error = iodone_w_error;
-		if (block->submit_bio_bh_rw & REQ_FLUSH) {
+		if (block->submit_bio_bh_op_flags & REQ_FLUSH) {
 			dev_state->last_flush_gen++;
 			if ((dev_state->state->print_mask &
 			     BTRFSIC_PRINT_MASK_END_IO_BIO_BH))
@@ -2245,7 +2251,7 @@ static void btrfsic_bio_end_io(struct bio *bp)
 				       dev_state->name,
 				       dev_state->last_flush_gen);
 		}
-		if (block->submit_bio_bh_rw & REQ_FUA)
+		if (block->submit_bio_bh_op_flags & REQ_FUA)
 			block->flush_gen = 0; /* FUA completed means block is
 					       * on disk */
 		block->is_iodone = 1; /* for FLUSH, this releases the block */
@@ -2272,7 +2278,7 @@ static void btrfsic_bh_end_io(struct buffer_head *bh, int uptodate)
 		       block->dev_bytenr, block->mirror_num);
 
 	block->iodone_w_error = iodone_w_error;
-	if (block->submit_bio_bh_rw & REQ_FLUSH) {
+	if (block->submit_bio_bh_op_flags & REQ_FLUSH) {
 		dev_state->last_flush_gen++;
 		if ((dev_state->state->print_mask &
 		     BTRFSIC_PRINT_MASK_END_IO_BIO_BH))
@@ -2280,7 +2286,7 @@ static void btrfsic_bh_end_io(struct buffer_head *bh, int uptodate)
 			       "bh_end_io() new %s flush_gen=%llu\n",
 			       dev_state->name, dev_state->last_flush_gen);
 	}
-	if (block->submit_bio_bh_rw & REQ_FUA)
+	if (block->submit_bio_bh_op_flags & REQ_FUA)
 		block->flush_gen = 0; /* FUA completed means block is on disk */
 
 	bh->b_private = block->orig_bio_bh_private;
@@ -2897,12 +2903,12 @@ static struct btrfsic_dev_state *btrfsic_dev_state_lookup(
 	return ds;
 }
 
-int btrfsic_submit_bh(int rw, struct buffer_head *bh)
+int btrfsic_submit_bh(int op, int op_flags, struct buffer_head *bh)
 {
 	struct btrfsic_dev_state *dev_state;
 
 	if (!btrfsic_is_initialized)
-		return submit_bh(rw, bh);
+		return submit_bh(op | op_flags, bh);
 
 	mutex_lock(&btrfsic_mutex);
 	/* since btrfsic_submit_bh() might also be called before
@@ -2911,26 +2917,26 @@ int btrfsic_submit_bh(int rw, struct buffer_head *bh)
 
 	/* Only called to write the superblock (incl. FLUSH/FUA) */
 	if (NULL != dev_state &&
-	    (rw & WRITE) && bh->b_size > 0) {
+	    (op == REQ_OP_WRITE) && bh->b_size > 0) {
 		u64 dev_bytenr;
 
 		dev_bytenr = 4096 * bh->b_blocknr;
 		if (dev_state->state->print_mask &
 		    BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH)
 			printk(KERN_INFO
-			       "submit_bh(rw=0x%x, blocknr=%llu (bytenr %llu),"
-			       " size=%zu, data=%p, bdev=%p)\n",
-			       rw, (unsigned long long)bh->b_blocknr,
+			       "submit_bh(op=%d rw=0x%x, blocknr=%llu "
+			       "(bytenr %llu), size=%zu, data=%p, bdev=%p)\n",
+			       op, op_flags, (unsigned long long)bh->b_blocknr,
 			       dev_bytenr, bh->b_size, bh->b_data, bh->b_bdev);
 		btrfsic_process_written_block(dev_state, dev_bytenr,
 					      &bh->b_data, 1, NULL,
-					      NULL, bh, rw);
-	} else if (NULL != dev_state && (rw & REQ_FLUSH)) {
+					      NULL, bh, op, op_flags);
+	} else if (NULL != dev_state && (op_flags & REQ_FLUSH)) {
 		if (dev_state->state->print_mask &
 		    BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH)
 			printk(KERN_INFO
 			       "submit_bh(rw=0x%x FLUSH, bdev=%p)\n",
-			       rw, bh->b_bdev);
+			       op, bh->b_bdev);
 		if (!dev_state->dummy_block_for_bio_bh_flush.is_iodone) {
 			if ((dev_state->state->print_mask &
 			     (BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH |
@@ -2948,7 +2954,8 @@ int btrfsic_submit_bh(int rw, struct buffer_head *bh)
 			block->never_written = 0;
 			block->iodone_w_error = 0;
 			block->flush_gen = dev_state->last_flush_gen + 1;
-			block->submit_bio_bh_rw = rw;
+			block->submit_bio_bh_op = op;
+			block->submit_bio_bh_op_flags = op_flags;
 			block->orig_bio_bh_private = bh->b_private;
 			block->orig_bio_bh_end_io.bh = bh->b_end_io;
 			block->next_in_same_bio = NULL;
@@ -2957,10 +2964,10 @@ int btrfsic_submit_bh(int rw, struct buffer_head *bh)
 		}
 	}
 	mutex_unlock(&btrfsic_mutex);
-	return submit_bh(rw, bh);
+	return submit_bh(op | op_flags, bh);
 }
 
-static void __btrfsic_submit_bio(int rw, struct bio *bio)
+static void __btrfsic_submit_bio(int op, int op_flags, struct bio *bio)
 {
 	struct btrfsic_dev_state *dev_state;
 
@@ -2972,7 +2979,7 @@ static void __btrfsic_submit_bio(int rw, struct bio *bio)
 	 * btrfsic_mount(), this might return NULL */
 	dev_state = btrfsic_dev_state_lookup(bio->bi_bdev);
 	if (NULL != dev_state &&
-	    (rw & WRITE) && NULL != bio->bi_io_vec) {
+	    (op == REQ_OP_WRITE) && NULL != bio->bi_io_vec) {
 		unsigned int i;
 		u64 dev_bytenr;
 		u64 cur_bytenr;
@@ -2986,7 +2993,7 @@ static void __btrfsic_submit_bio(int rw, struct bio *bio)
 			printk(KERN_INFO
 			       "submit_bio(rw=0x%x, bi_vcnt=%u,"
 			       " bi_sector=%llu (bytenr %llu), bi_bdev=%p)\n",
-			       rw, bio->bi_vcnt,
+			       op, bio->bi_vcnt,
 			       (unsigned long long)bio->bi_iter.bi_sector,
 			       dev_bytenr, bio->bi_bdev);
 
@@ -3017,18 +3024,18 @@ static void __btrfsic_submit_bio(int rw, struct bio *bio)
 		btrfsic_process_written_block(dev_state, dev_bytenr,
 					      mapped_datav, bio->bi_vcnt,
 					      bio, &bio_is_patched,
-					      NULL, rw);
+					      NULL, op, op_flags);
 		while (i > 0) {
 			i--;
 			kunmap(bio->bi_io_vec[i].bv_page);
 		}
 		kfree(mapped_datav);
-	} else if (NULL != dev_state && (rw & REQ_FLUSH)) {
+	} else if (NULL != dev_state && (op_flags & REQ_FLUSH)) {
 		if (dev_state->state->print_mask &
 		    BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH)
 			printk(KERN_INFO
 			       "submit_bio(rw=0x%x FLUSH, bdev=%p)\n",
-			       rw, bio->bi_bdev);
+			       op, bio->bi_bdev);
 		if (!dev_state->dummy_block_for_bio_bh_flush.is_iodone) {
 			if ((dev_state->state->print_mask &
 			     (BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH |
@@ -3046,7 +3053,8 @@ static void __btrfsic_submit_bio(int rw, struct bio *bio)
 			block->never_written = 0;
 			block->iodone_w_error = 0;
 			block->flush_gen = dev_state->last_flush_gen + 1;
-			block->submit_bio_bh_rw = rw;
+			block->submit_bio_bh_op = op;
+			block->submit_bio_bh_op_flags = op_flags;
 			block->orig_bio_bh_private = bio->bi_private;
 			block->orig_bio_bh_end_io.bio = bio->bi_end_io;
 			block->next_in_same_bio = NULL;
@@ -3060,13 +3068,13 @@ leave:
 
 void btrfsic_submit_bio(int op, int op_flags, struct bio *bio)
 {
-	__btrfsic_submit_bio(op | op_flags, bio);
+	__btrfsic_submit_bio(op, op_flags, bio);
 	submit_bio(op, op_flags, bio);
 }
 
 int btrfsic_submit_bio_wait(int op, int op_flags, struct bio *bio)
 {
-	__btrfsic_submit_bio(op | op_flags, bio);
+	__btrfsic_submit_bio(op, op_flags, bio);
 	return submit_bio_wait(op, op_flags, bio);
 }
 
diff --git a/fs/btrfs/check-integrity.h b/fs/btrfs/check-integrity.h
index a8edc424..97f7d49 100644
--- a/fs/btrfs/check-integrity.h
+++ b/fs/btrfs/check-integrity.h
@@ -20,7 +20,7 @@
 #define __BTRFS_CHECK_INTEGRITY__
 
 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
-int btrfsic_submit_bh(int rw, struct buffer_head *bh);
+int btrfsic_submit_bh(int op, int op_flags, struct buffer_head *bh);
 void btrfsic_submit_bio(int op, int op_flags, struct bio *bio);
 int btrfsic_submit_bio_wait(int op, int op_flags, struct bio *bio);
 #else
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 6c17d5d..f1262e6 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3323,9 +3323,9 @@ static int write_dev_supers(struct btrfs_device *device,
 		 * to go down lazy.
 		 */
 		if (i == 0)
-			ret = btrfsic_submit_bh(WRITE_FUA, bh);
+			ret = btrfsic_submit_bh(REQ_OP_WRITE, WRITE_FUA, bh);
 		else
-			ret = btrfsic_submit_bh(WRITE_SYNC, bh);
+			ret = btrfsic_submit_bh(REQ_OP_WRITE, WRITE_SYNC, bh);
 		if (ret)
 			errors++;
 	}
-- 
1.8.3.1

[PATCH 16/32] block/fs/md: pass in op and flags to submit_bh

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch prepares submit_bh callers for the next
patches that split bi_rw into a operation and flags field.
Instead of passing in a bitmap with both the operation and
flags mixed in, the callers now pass them in seperately.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 drivers/md/bitmap.c         |  4 ++--
 fs/btrfs/check-integrity.c  |  4 ++--
 fs/buffer.c                 | 52 ++++++++++++++++++++++-----------------------
 fs/ext4/balloc.c            |  2 +-
 fs/ext4/ialloc.c            |  2 +-
 fs/ext4/inode.c             |  2 +-
 fs/ext4/mmp.c               |  4 ++--
 fs/ext4/super.c             |  2 +-
 fs/fat/misc.c               |  2 +-
 fs/gfs2/bmap.c              |  2 +-
 fs/gfs2/dir.c               |  2 +-
 fs/gfs2/meta_io.c           |  8 +++----
 fs/jbd2/commit.c            |  7 +++---
 fs/jbd2/journal.c           |  8 +++----
 fs/nilfs2/btnode.c          |  6 +++---
 fs/nilfs2/btnode.h          |  2 +-
 fs/nilfs2/btree.c           |  6 ++++--
 fs/nilfs2/gcinode.c         |  5 +++--
 fs/nilfs2/mdt.c             | 11 +++++-----
 fs/nilfs2/super.c           |  4 ++--
 fs/ntfs/aops.c              |  6 +++---
 fs/ntfs/compress.c          |  2 +-
 fs/ntfs/file.c              |  2 +-
 fs/ntfs/logfile.c           |  2 +-
 fs/ntfs/mft.c               |  4 ++--
 fs/ocfs2/buffer_head_io.c   |  8 +++----
 fs/reiserfs/inode.c         |  4 ++--
 fs/reiserfs/journal.c       | 12 ++++++-----
 fs/ufs/util.c               |  2 +-
 include/linux/buffer_head.h |  9 ++++----
 30 files changed, 97 insertions(+), 89 deletions(-)

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 48b5890..9070ee8 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -299,7 +299,7 @@ static void write_page(struct bitmap *bitmap, struct page *page, int wait)
 			atomic_inc(&bitmap->pending_writes);
 			set_buffer_locked(bh);
 			set_buffer_mapped(bh);
-			submit_bh(WRITE | REQ_SYNC, bh);
+			submit_bh(REQ_OP_WRITE, REQ_SYNC, bh);
 			bh = bh->b_this_page;
 		}
 
@@ -394,7 +394,7 @@ static int read_page(struct file *file, unsigned long index,
 			atomic_inc(&bitmap->pending_writes);
 			set_buffer_locked(bh);
 			set_buffer_mapped(bh);
-			submit_bh(READ, bh);
+			submit_bh(REQ_OP_READ, 0, bh);
 		}
 		block++;
 		bh = bh->b_this_page;
diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
index 17eba2d..9cb367f0 100644
--- a/fs/btrfs/check-integrity.c
+++ b/fs/btrfs/check-integrity.c
@@ -2908,7 +2908,7 @@ int btrfsic_submit_bh(int op, int op_flags, struct buffer_head *bh)
 	struct btrfsic_dev_state *dev_state;
 
 	if (!btrfsic_is_initialized)
-		return submit_bh(op | op_flags, bh);
+		return submit_bh(op, op_flags, bh);
 
 	mutex_lock(&btrfsic_mutex);
 	/* since btrfsic_submit_bh() might also be called before
@@ -2964,7 +2964,7 @@ int btrfsic_submit_bh(int op, int op_flags, struct buffer_head *bh)
 		}
 	}
 	mutex_unlock(&btrfsic_mutex);
-	return submit_bh(op | op_flags, bh);
+	return submit_bh(op, op_flags, bh);
 }
 
 static void __btrfsic_submit_bio(int op, int op_flags, struct bio *bio)
diff --git a/fs/buffer.c b/fs/buffer.c
index a190c25..cd07d86 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -45,7 +45,7 @@
 #include <trace/events/block.h>
 
 static int fsync_buffers_list(spinlock_t *lock, struct list_head *list);
-static int submit_bh_wbc(int rw, struct buffer_head *bh,
+static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
 			 unsigned long bio_flags,
 			 struct writeback_control *wbc);
 
@@ -1236,7 +1236,7 @@ static struct buffer_head *__bread_slow(struct buffer_head *bh)
 	} else {
 		get_bh(bh);
 		bh->b_end_io = end_buffer_read_sync;
-		submit_bh(READ, bh);
+		submit_bh(REQ_OP_READ, 0, bh);
 		wait_on_buffer(bh);
 		if (buffer_uptodate(bh))
 			return bh;
@@ -1708,7 +1708,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
 	struct buffer_head *bh, *head;
 	unsigned int blocksize, bbits;
 	int nr_underway = 0;
-	int write_op = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE);
+	int write_flags = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC: 0);
 
 	head = create_page_buffers(page, inode,
 					(1 << BH_Dirty)|(1 << BH_Uptodate));
@@ -1797,7 +1797,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
 	do {
 		struct buffer_head *next = bh->b_this_page;
 		if (buffer_async_write(bh)) {
-			submit_bh_wbc(write_op, bh, 0, wbc);
+			submit_bh_wbc(REQ_OP_WRITE, write_flags, bh, 0, wbc);
 			nr_underway++;
 		}
 		bh = next;
@@ -1851,7 +1851,7 @@ recover:
 		struct buffer_head *next = bh->b_this_page;
 		if (buffer_async_write(bh)) {
 			clear_buffer_dirty(bh);
-			submit_bh_wbc(write_op, bh, 0, wbc);
+			submit_bh_wbc(REQ_OP_WRITE, write_flags, bh, 0, wbc);
 			nr_underway++;
 		}
 		bh = next;
@@ -2259,7 +2259,7 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
 		if (buffer_uptodate(bh))
 			end_buffer_async_read(bh, 1);
 		else
-			submit_bh(READ, bh);
+			submit_bh(REQ_OP_READ, 0, bh);
 	}
 	return 0;
 }
@@ -2613,7 +2613,7 @@ int nobh_write_begin(struct address_space *mapping,
 		if (block_start < from || block_end > to) {
 			lock_buffer(bh);
 			bh->b_end_io = end_buffer_read_nobh;
-			submit_bh(READ, bh);
+			submit_bh(REQ_OP_READ, 0, bh);
 			nr_reads++;
 		}
 	}
@@ -2980,7 +2980,7 @@ static void end_bio_bh_io_sync(struct bio *bio)
  * errors, this only handles the "we need to be able to
  * do IO at the final sector" case.
  */
-void guard_bio_eod(int rw, struct bio *bio)
+void guard_bio_eod(int op, struct bio *bio)
 {
 	sector_t maxsector;
 	struct bio_vec *bvec = &bio->bi_io_vec[bio->bi_vcnt - 1];
@@ -3010,17 +3010,16 @@ void guard_bio_eod(int rw, struct bio *bio)
 	bvec->bv_len -= truncated_bytes;
 
 	/* ..and clear the end of the buffer for reads */
-	if ((rw & RW_MASK) == READ) {
+	if (op == REQ_OP_READ) {
 		zero_user(bvec->bv_page, bvec->bv_offset + bvec->bv_len,
 				truncated_bytes);
 	}
 }
 
-static int submit_bh_wbc(int rw, struct buffer_head *bh,
+static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
 			 unsigned long bio_flags, struct writeback_control *wbc)
 {
 	struct bio *bio;
-	int op_flags = 0;
 
 	BUG_ON(!buffer_locked(bh));
 	BUG_ON(!buffer_mapped(bh));
@@ -3031,7 +3030,7 @@ static int submit_bh_wbc(int rw, struct buffer_head *bh,
 	/*
 	 * Only clear out a write error when rewriting
 	 */
-	if (test_set_buffer_req(bh) && (rw & WRITE))
+	if (test_set_buffer_req(bh) && (op == REQ_OP_WRITE))
 		clear_buffer_write_io_error(bh);
 
 	/*
@@ -3056,26 +3055,27 @@ static int submit_bh_wbc(int rw, struct buffer_head *bh,
 	bio->bi_flags |= bio_flags;
 
 	/* Take care of bh's that straddle the end of the device */
-	guard_bio_eod(rw, bio);
+	guard_bio_eod(op, bio);
 
 	if (buffer_meta(bh))
 		op_flags |= REQ_META;
 	if (buffer_prio(bh))
 		op_flags |= REQ_PRIO;
 
-	submit_bio(rw, op_flags, bio);
+	submit_bio(op, op_flags, bio);
 	return 0;
 }
 
-int _submit_bh(int rw, struct buffer_head *bh, unsigned long bio_flags)
+int _submit_bh(int op, int op_flags, struct buffer_head *bh,
+	       unsigned long bio_flags)
 {
-	return submit_bh_wbc(rw, bh, bio_flags, NULL);
+	return submit_bh_wbc(op, op_flags, bh, bio_flags, NULL);
 }
 EXPORT_SYMBOL_GPL(_submit_bh);
 
-int submit_bh(int rw, struct buffer_head *bh)
+int submit_bh(int op, int op_flags, struct buffer_head *bh)
 {
-	return submit_bh_wbc(rw, bh, 0, NULL);
+	return submit_bh_wbc(op, op_flags, bh, 0, NULL);
 }
 EXPORT_SYMBOL(submit_bh);
 
@@ -3117,14 +3117,14 @@ void ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
 			if (test_clear_buffer_dirty(bh)) {
 				bh->b_end_io = end_buffer_write_sync;
 				get_bh(bh);
-				submit_bh(WRITE, bh);
+				submit_bh(REQ_OP_WRITE, 0, bh);
 				continue;
 			}
 		} else {
 			if (!buffer_uptodate(bh)) {
 				bh->b_end_io = end_buffer_read_sync;
 				get_bh(bh);
-				submit_bh(rw, bh);
+				submit_bh(rw, 0, bh);
 				continue;
 			}
 		}
@@ -3133,7 +3133,7 @@ void ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
 }
 EXPORT_SYMBOL(ll_rw_block);
 
-void write_dirty_buffer(struct buffer_head *bh, int rw)
+void write_dirty_buffer(struct buffer_head *bh, int op_flags)
 {
 	lock_buffer(bh);
 	if (!test_clear_buffer_dirty(bh)) {
@@ -3142,7 +3142,7 @@ void write_dirty_buffer(struct buffer_head *bh, int rw)
 	}
 	bh->b_end_io = end_buffer_write_sync;
 	get_bh(bh);
-	submit_bh(rw, bh);
+	submit_bh(REQ_OP_WRITE, op_flags, bh);
 }
 EXPORT_SYMBOL(write_dirty_buffer);
 
@@ -3151,7 +3151,7 @@ EXPORT_SYMBOL(write_dirty_buffer);
  * and then start new I/O and then wait upon it.  The caller must have a ref on
  * the buffer_head.
  */
-int __sync_dirty_buffer(struct buffer_head *bh, int rw)
+int __sync_dirty_buffer(struct buffer_head *bh, int op, int op_flags)
 {
 	int ret = 0;
 
@@ -3160,7 +3160,7 @@ int __sync_dirty_buffer(struct buffer_head *bh, int rw)
 	if (test_clear_buffer_dirty(bh)) {
 		get_bh(bh);
 		bh->b_end_io = end_buffer_write_sync;
-		ret = submit_bh(rw, bh);
+		ret = submit_bh(op, op_flags, bh);
 		wait_on_buffer(bh);
 		if (!ret && !buffer_uptodate(bh))
 			ret = -EIO;
@@ -3173,7 +3173,7 @@ EXPORT_SYMBOL(__sync_dirty_buffer);
 
 int sync_dirty_buffer(struct buffer_head *bh)
 {
-	return __sync_dirty_buffer(bh, WRITE_SYNC);
+	return __sync_dirty_buffer(bh, REQ_OP_WRITE, WRITE_SYNC);
 }
 EXPORT_SYMBOL(sync_dirty_buffer);
 
@@ -3423,7 +3423,7 @@ int bh_submit_read(struct buffer_head *bh)
 
 	get_bh(bh);
 	bh->b_end_io = end_buffer_read_sync;
-	submit_bh(READ, bh);
+	submit_bh(REQ_OP_READ, 0, bh);
 	wait_on_buffer(bh);
 	if (buffer_uptodate(bh))
 		return 0;
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index cd6ea29..61f64f0 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -465,7 +465,7 @@ ext4_read_block_bitmap_nowait(struct super_block *sb, ext4_group_t block_group)
 	trace_ext4_read_block_bitmap_load(sb, block_group);
 	bh->b_end_io = ext4_end_bitmap_read;
 	get_bh(bh);
-	submit_bh(READ | REQ_META | REQ_PRIO, bh);
+	submit_bh(REQ_OP_READ, REQ_META | REQ_PRIO, bh);
 	return bh;
 verify:
 	ext4_validate_block_bitmap(sb, desc, block_group, bh);
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 619bfc1..803212e 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -175,7 +175,7 @@ ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
 	trace_ext4_load_inode_bitmap(sb, block_group);
 	bh->b_end_io = ext4_end_bitmap_read;
 	get_bh(bh);
-	submit_bh(READ | REQ_META | REQ_PRIO, bh);
+	submit_bh(REQ_OP_READ, REQ_META | REQ_PRIO, bh);
 	wait_on_buffer(bh);
 	if (!buffer_uptodate(bh)) {
 		put_bh(bh);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 612fbcf..f34ef29 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3932,7 +3932,7 @@ make_io:
 		trace_ext4_load_inode(inode);
 		get_bh(bh);
 		bh->b_end_io = end_buffer_read_sync;
-		submit_bh(READ | REQ_META | REQ_PRIO, bh);
+		submit_bh(REQ_OP_READ, REQ_META | REQ_PRIO, bh);
 		wait_on_buffer(bh);
 		if (!buffer_uptodate(bh)) {
 			EXT4_ERROR_INODE_BLOCK(inode, block,
diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c
index 6eb1a61..381d3d0 100644
--- a/fs/ext4/mmp.c
+++ b/fs/ext4/mmp.c
@@ -52,7 +52,7 @@ static int write_mmp_block(struct super_block *sb, struct buffer_head *bh)
 	lock_buffer(bh);
 	bh->b_end_io = end_buffer_write_sync;
 	get_bh(bh);
-	submit_bh(WRITE_SYNC | REQ_META | REQ_PRIO, bh);
+	submit_bh(REQ_OP_WRITE, WRITE_SYNC | REQ_META | REQ_PRIO, bh);
 	wait_on_buffer(bh);
 	sb_end_write(sb);
 	if (unlikely(!buffer_uptodate(bh)))
@@ -88,7 +88,7 @@ static int read_mmp_block(struct super_block *sb, struct buffer_head **bh,
 	get_bh(*bh);
 	lock_buffer(*bh);
 	(*bh)->b_end_io = end_buffer_read_sync;
-	submit_bh(READ_SYNC | REQ_META | REQ_PRIO, *bh);
+	submit_bh(REQ_OP_READ, READ_SYNC | REQ_META | REQ_PRIO, *bh);
 	wait_on_buffer(*bh);
 	if (!buffer_uptodate(*bh)) {
 		brelse(*bh);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index a63c7b0..d9e4329 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4681,7 +4681,7 @@ static int ext4_commit_super(struct super_block *sb, int sync)
 	ext4_superblock_csum_set(sb);
 	mark_buffer_dirty(sbh);
 	if (sync) {
-		error = __sync_dirty_buffer(sbh,
+		error = __sync_dirty_buffer(sbh, REQ_OP_WRITE,
 			test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
 		if (error)
 			return error;
diff --git a/fs/fat/misc.c b/fs/fat/misc.c
index c4589e9..8a86981 100644
--- a/fs/fat/misc.c
+++ b/fs/fat/misc.c
@@ -267,7 +267,7 @@ int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs)
 	int i, err = 0;
 
 	for (i = 0; i < nr_bhs; i++)
-		write_dirty_buffer(bhs[i], WRITE);
+		write_dirty_buffer(bhs[i], 0);
 
 	for (i = 0; i < nr_bhs; i++) {
 		wait_on_buffer(bhs[i]);
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 61296ec..967154c 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -285,7 +285,7 @@ static void gfs2_metapath_ra(struct gfs2_glock *gl,
 		if (trylock_buffer(rabh)) {
 			if (!buffer_uptodate(rabh)) {
 				rabh->b_end_io = end_buffer_read_sync;
-				submit_bh(READA | REQ_META, rabh);
+				submit_bh(REQ_OP_READ, READA | REQ_META, rabh);
 				continue;
 			}
 			unlock_buffer(rabh);
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index 487527b..f11f377 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -1418,7 +1418,7 @@ static void gfs2_dir_readahead(struct inode *inode, unsigned hsize, u32 index,
 				continue;
 			}
 			bh->b_end_io = end_buffer_read_sync;
-			submit_bh(READA | REQ_META, bh);
+			submit_bh(REQ_OP_READ, READA | REQ_META, bh);
 			continue;
 		}
 		brelse(bh);
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 0e1d4be..ff483bc 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -37,8 +37,8 @@ static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wb
 {
 	struct buffer_head *bh, *head;
 	int nr_underway = 0;
-	int write_op = REQ_META | REQ_PRIO |
-		(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE);
+	int write_flags = REQ_META | REQ_PRIO |
+		(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : 0);
 
 	BUG_ON(!PageLocked(page));
 	BUG_ON(!page_has_buffers(page));
@@ -79,7 +79,7 @@ static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wb
 	do {
 		struct buffer_head *next = bh->b_this_page;
 		if (buffer_async_write(bh)) {
-			submit_bh(write_op, bh);
+			submit_bh(REQ_OP_WRITE, write_flags, bh);
 			nr_underway++;
 		}
 		bh = next;
@@ -217,7 +217,7 @@ int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
 	}
 	bh->b_end_io = end_buffer_read_sync;
 	get_bh(bh);
-	submit_bh(READ_SYNC | REQ_META | REQ_PRIO, bh);
+	submit_bh(REQ_OP_READ, READ_SYNC | REQ_META | REQ_PRIO, bh);
 	if (!(flags & DIO_WAIT))
 		return 0;
 
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 362e5f6..4471d28 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -159,9 +159,10 @@ static int journal_submit_commit_record(journal_t *journal,
 	if (journal->j_flags & JBD2_BARRIER &&
 	    !JBD2_HAS_INCOMPAT_FEATURE(journal,
 				       JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT))
-		ret = submit_bh(WRITE_SYNC | WRITE_FLUSH_FUA, bh);
+		ret = submit_bh(REQ_OP_WRITE,
+				WRITE_SYNC | WRITE_FLUSH_FUA, bh);
 	else
-		ret = submit_bh(WRITE_SYNC, bh);
+		ret = submit_bh(REQ_OP_WRITE, WRITE_SYNC, bh);
 
 	*cbh = bh;
 	return ret;
@@ -740,7 +741,7 @@ start_journal_io:
 				clear_buffer_dirty(bh);
 				set_buffer_uptodate(bh);
 				bh->b_end_io = journal_end_buffer_io_sync;
-				submit_bh(WRITE_SYNC, bh);
+				submit_bh(REQ_OP_WRITE, WRITE_SYNC, bh);
 			}
 			cond_resched();
 			stats.run.rs_blocks_logged += bufs;
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 8270fe9..e3855b0 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1323,15 +1323,15 @@ static int journal_reset(journal_t *journal)
 	return jbd2_journal_start_thread(journal);
 }
 
-static int jbd2_write_superblock(journal_t *journal, int write_op)
+static int jbd2_write_superblock(journal_t *journal, int write_flags)
 {
 	struct buffer_head *bh = journal->j_sb_buffer;
 	journal_superblock_t *sb = journal->j_superblock;
 	int ret;
 
-	trace_jbd2_write_superblock(journal, write_op);
+	trace_jbd2_write_superblock(journal, write_flags);
 	if (!(journal->j_flags & JBD2_BARRIER))
-		write_op &= ~(REQ_FUA | REQ_FLUSH);
+		write_flags &= ~(REQ_FUA | REQ_FLUSH);
 	lock_buffer(bh);
 	if (buffer_write_io_error(bh)) {
 		/*
@@ -1351,7 +1351,7 @@ static int jbd2_write_superblock(journal_t *journal, int write_op)
 	jbd2_superblock_csum_set(journal, sb);
 	get_bh(bh);
 	bh->b_end_io = end_buffer_write_sync;
-	ret = submit_bh(write_op, bh);
+	ret = submit_bh(REQ_OP_WRITE, write_flags, bh);
 	wait_on_buffer(bh);
 	if (buffer_write_io_error(bh)) {
 		clear_buffer_write_io_error(bh);
diff --git a/fs/nilfs2/btnode.c b/fs/nilfs2/btnode.c
index a35ae35..07fe874 100644
--- a/fs/nilfs2/btnode.c
+++ b/fs/nilfs2/btnode.c
@@ -67,7 +67,7 @@ nilfs_btnode_create_block(struct address_space *btnc, __u64 blocknr)
 }
 
 int nilfs_btnode_submit_block(struct address_space *btnc, __u64 blocknr,
-			      sector_t pblocknr, int mode,
+			      sector_t pblocknr, int mode, int mode_flags,
 			      struct buffer_head **pbh, sector_t *submit_ptr)
 {
 	struct buffer_head *bh;
@@ -100,7 +100,7 @@ int nilfs_btnode_submit_block(struct address_space *btnc, __u64 blocknr,
 		}
 	}
 
-	if (mode == READA) {
+	if (mode_flags & REQ_RAHEAD) {
 		if (pblocknr != *submit_ptr + 1 || !trylock_buffer(bh)) {
 			err = -EBUSY; /* internal code */
 			brelse(bh);
@@ -119,7 +119,7 @@ int nilfs_btnode_submit_block(struct address_space *btnc, __u64 blocknr,
 	bh->b_blocknr = pblocknr; /* set block address for read */
 	bh->b_end_io = end_buffer_read_sync;
 	get_bh(bh);
-	submit_bh(mode, bh);
+	submit_bh(mode, mode_flags, bh);
 	bh->b_blocknr = blocknr; /* set back to the given block address */
 	*submit_ptr = pblocknr;
 	err = 0;
diff --git a/fs/nilfs2/btnode.h b/fs/nilfs2/btnode.h
index d876b56..3f93197 100644
--- a/fs/nilfs2/btnode.h
+++ b/fs/nilfs2/btnode.h
@@ -47,7 +47,7 @@ void nilfs_btnode_cache_clear(struct address_space *);
 struct buffer_head *nilfs_btnode_create_block(struct address_space *btnc,
 					      __u64 blocknr);
 int nilfs_btnode_submit_block(struct address_space *, __u64, sector_t, int,
-			      struct buffer_head **, sector_t *);
+			      int, struct buffer_head **, sector_t *);
 void nilfs_btnode_delete(struct buffer_head *);
 int nilfs_btnode_prepare_change_key(struct address_space *,
 				    struct nilfs_btnode_chkey_ctxt *);
diff --git a/fs/nilfs2/btree.c b/fs/nilfs2/btree.c
index 919fd5b..0cc1a24 100644
--- a/fs/nilfs2/btree.c
+++ b/fs/nilfs2/btree.c
@@ -480,7 +480,8 @@ static int __nilfs_btree_get_block(const struct nilfs_bmap *btree, __u64 ptr,
 	sector_t submit_ptr = 0;
 	int ret;
 
-	ret = nilfs_btnode_submit_block(btnc, ptr, 0, READ, &bh, &submit_ptr);
+	ret = nilfs_btnode_submit_block(btnc, ptr, 0, REQ_OP_READ, 0, &bh,
+					&submit_ptr);
 	if (ret) {
 		if (ret != -EEXIST)
 			return ret;
@@ -496,7 +497,8 @@ static int __nilfs_btree_get_block(const struct nilfs_bmap *btree, __u64 ptr,
 		     n > 0 && i < ra->ncmax; n--, i++) {
 			ptr2 = nilfs_btree_node_get_ptr(ra->node, i, ra->ncmax);
 
-			ret = nilfs_btnode_submit_block(btnc, ptr2, 0, READA,
+			ret = nilfs_btnode_submit_block(btnc, ptr2, 0,
+							REQ_OP_READ, REQ_RAHEAD,
 							&ra_bh, &submit_ptr);
 			if (likely(!ret || ret == -EEXIST))
 				brelse(ra_bh);
diff --git a/fs/nilfs2/gcinode.c b/fs/nilfs2/gcinode.c
index 748ca23..1f18ffc 100644
--- a/fs/nilfs2/gcinode.c
+++ b/fs/nilfs2/gcinode.c
@@ -106,7 +106,7 @@ int nilfs_gccache_submit_read_data(struct inode *inode, sector_t blkoff,
 	bh->b_blocknr = pbn;
 	bh->b_end_io = end_buffer_read_sync;
 	get_bh(bh);
-	submit_bh(READ, bh);
+	submit_bh(REQ_OP_READ, 0, bh);
 	if (vbn)
 		bh->b_blocknr = vbn;
  out:
@@ -143,7 +143,8 @@ int nilfs_gccache_submit_read_node(struct inode *inode, sector_t pbn,
 	int ret;
 
 	ret = nilfs_btnode_submit_block(&NILFS_I(inode)->i_btnode_cache,
-					vbn ? : pbn, pbn, READ, out_bh, &pbn);
+					vbn ? : pbn, pbn, REQ_OP_READ, 0,
+					out_bh, &pbn);
 	if (ret == -EEXIST) /* internal code (cache hit) */
 		ret = 0;
 	return ret;
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index dee34d9..febc510 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -120,7 +120,7 @@ static int nilfs_mdt_create_block(struct inode *inode, unsigned long block,
 
 static int
 nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff,
-		       int mode, struct buffer_head **out_bh)
+		       int mode, int mode_flags, struct buffer_head **out_bh)
 {
 	struct buffer_head *bh;
 	__u64 blknum = 0;
@@ -134,7 +134,7 @@ nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff,
 	if (buffer_uptodate(bh))
 		goto out;
 
-	if (mode == READA) {
+	if (mode_flags & REQ_RAHEAD) {
 		if (!trylock_buffer(bh)) {
 			ret = -EBUSY;
 			goto failed_bh;
@@ -156,7 +156,7 @@ nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff,
 
 	bh->b_end_io = end_buffer_read_sync;
 	get_bh(bh);
-	submit_bh(mode, bh);
+	submit_bh(mode, mode_flags, bh);
 	ret = 0;
  out:
 	get_bh(bh);
@@ -178,7 +178,7 @@ static int nilfs_mdt_read_block(struct inode *inode, unsigned long block,
 	int i, nr_ra_blocks = NILFS_MDT_MAX_RA_BLOCKS;
 	int err;
 
-	err = nilfs_mdt_submit_block(inode, block, READ, &first_bh);
+	err = nilfs_mdt_submit_block(inode, block, REQ_OP_READ, 0, &first_bh);
 	if (err == -EEXIST) /* internal code */
 		goto out;
 
@@ -188,7 +188,8 @@ static int nilfs_mdt_read_block(struct inode *inode, unsigned long block,
 	if (readahead) {
 		blkoff = block + 1;
 		for (i = 0; i < nr_ra_blocks; i++, blkoff++) {
-			err = nilfs_mdt_submit_block(inode, blkoff, READA, &bh);
+			err = nilfs_mdt_submit_block(inode, blkoff, REQ_OP_READ,
+						     REQ_RAHEAD, &bh);
 			if (likely(!err || err == -EEXIST))
 				brelse(bh);
 			else if (err != -EBUSY)
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index f47585b..b2451f2 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -195,8 +195,8 @@ static int nilfs_sync_super(struct super_block *sb, int flag)
  retry:
 	set_buffer_dirty(nilfs->ns_sbh[0]);
 	if (nilfs_test_opt(nilfs, BARRIER)) {
-		err = __sync_dirty_buffer(nilfs->ns_sbh[0],
-					  WRITE_SYNC | WRITE_FLUSH_FUA);
+		err = __sync_dirty_buffer(nilfs->ns_sbh[0], REQ_OP_WRITE,
+				WRITE_SYNC | WRITE_FLUSH_FUA);
 	} else {
 		err = sync_dirty_buffer(nilfs->ns_sbh[0]);
 	}
diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
index 7521e11..57c64bd 100644
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -362,7 +362,7 @@ handle_zblock:
 		for (i = 0; i < nr; i++) {
 			tbh = arr[i];
 			if (likely(!buffer_uptodate(tbh)))
-				submit_bh(READ, tbh);
+				submit_bh(REQ_OP_READ, 0, tbh);
 			else
 				ntfs_end_buffer_async_read(tbh, 1);
 		}
@@ -877,7 +877,7 @@ lock_retry_remap:
 	do {
 		struct buffer_head *next = bh->b_this_page;
 		if (buffer_async_write(bh)) {
-			submit_bh(WRITE, bh);
+			submit_bh(REQ_OP_WRITE, 0, bh);
 			need_end_writeback = false;
 		}
 		bh = next;
@@ -1202,7 +1202,7 @@ lock_retry_remap:
 		BUG_ON(!buffer_mapped(tbh));
 		get_bh(tbh);
 		tbh->b_end_io = end_buffer_write_sync;
-		submit_bh(WRITE, tbh);
+		submit_bh(REQ_OP_WRITE, 0, tbh);
 	}
 	/* Synchronize the mft mirror now if not @sync. */
 	if (is_mft && !sync)
diff --git a/fs/ntfs/compress.c b/fs/ntfs/compress.c
index f82498c..1fd482c 100644
--- a/fs/ntfs/compress.c
+++ b/fs/ntfs/compress.c
@@ -674,7 +674,7 @@ lock_retry_remap:
 		}
 		get_bh(tbh);
 		tbh->b_end_io = end_buffer_read_sync;
-		submit_bh(READ, tbh);
+		submit_bh(REQ_OP_READ, 0, tbh);
 	}
 
 	/* Wait for io completion on all buffer heads. */
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index 262561f..bcd3d84 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -553,7 +553,7 @@ static inline int ntfs_submit_bh_for_read(struct buffer_head *bh)
 	lock_buffer(bh);
 	get_bh(bh);
 	bh->b_end_io = end_buffer_read_sync;
-	return submit_bh(READ, bh);
+	return submit_bh(REQ_OP_READ, 0, bh);
 }
 
 /**
diff --git a/fs/ntfs/logfile.c b/fs/ntfs/logfile.c
index c71de29..1c95c41 100644
--- a/fs/ntfs/logfile.c
+++ b/fs/ntfs/logfile.c
@@ -821,7 +821,7 @@ map_vcn:
 			 * completed ignore errors afterwards as we can assume
 			 * that if one buffer worked all of them will work.
 			 */
-			submit_bh(WRITE, bh);
+			submit_bh(REQ_OP_WRITE, 0, bh);
 			if (should_wait) {
 				should_wait = false;
 				wait_on_buffer(bh);
diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c
index 3014a36..38c6f7a 100644
--- a/fs/ntfs/mft.c
+++ b/fs/ntfs/mft.c
@@ -592,7 +592,7 @@ int ntfs_sync_mft_mirror(ntfs_volume *vol, const unsigned long mft_no,
 			clear_buffer_dirty(tbh);
 			get_bh(tbh);
 			tbh->b_end_io = end_buffer_write_sync;
-			submit_bh(WRITE, tbh);
+			submit_bh(REQ_OP_WRITE, 0, tbh);
 		}
 		/* Wait on i/o completion of buffers. */
 		for (i_bhs = 0; i_bhs < nr_bhs; i_bhs++) {
@@ -785,7 +785,7 @@ int write_mft_record_nolock(ntfs_inode *ni, MFT_RECORD *m, int sync)
 		clear_buffer_dirty(tbh);
 		get_bh(tbh);
 		tbh->b_end_io = end_buffer_write_sync;
-		submit_bh(WRITE, tbh);
+		submit_bh(REQ_OP_WRITE, 0, tbh);
 	}
 	/* Synchronize the mft mirror now if not @sync. */
 	if (!sync && ni->mft_no < vol->mftmirr_size)
diff --git a/fs/ocfs2/buffer_head_io.c b/fs/ocfs2/buffer_head_io.c
index fe50ded..fb775c9 100644
--- a/fs/ocfs2/buffer_head_io.c
+++ b/fs/ocfs2/buffer_head_io.c
@@ -79,7 +79,7 @@ int ocfs2_write_block(struct ocfs2_super *osb, struct buffer_head *bh,
 
 	get_bh(bh); /* for end_buffer_write_sync() */
 	bh->b_end_io = end_buffer_write_sync;
-	submit_bh(WRITE, bh);
+	submit_bh(REQ_OP_WRITE, 0, bh);
 
 	wait_on_buffer(bh);
 
@@ -149,7 +149,7 @@ int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
 		clear_buffer_uptodate(bh);
 		get_bh(bh); /* for end_buffer_read_sync() */
 		bh->b_end_io = end_buffer_read_sync;
-		submit_bh(READ, bh);
+		submit_bh(REQ_OP_READ, 0, bh);
 	}
 
 	for (i = nr; i > 0; i--) {
@@ -305,7 +305,7 @@ int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr,
 			if (validate)
 				set_buffer_needs_validate(bh);
 			bh->b_end_io = end_buffer_read_sync;
-			submit_bh(READ, bh);
+			submit_bh(REQ_OP_READ, 0, bh);
 			continue;
 		}
 	}
@@ -419,7 +419,7 @@ int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
 	get_bh(bh); /* for end_buffer_write_sync() */
 	bh->b_end_io = end_buffer_write_sync;
 	ocfs2_compute_meta_ecc(osb->sb, bh->b_data, &di->i_check);
-	submit_bh(WRITE, bh);
+	submit_bh(REQ_OP_WRITE, 0, bh);
 
 	wait_on_buffer(bh);
 
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 3d8e7e6..f491ef4 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -2667,7 +2667,7 @@ static int reiserfs_write_full_page(struct page *page,
 	do {
 		struct buffer_head *next = bh->b_this_page;
 		if (buffer_async_write(bh)) {
-			submit_bh(WRITE, bh);
+			submit_bh(REQ_OP_WRITE, 0, bh);
 			nr++;
 		}
 		put_bh(bh);
@@ -2727,7 +2727,7 @@ fail:
 		struct buffer_head *next = bh->b_this_page;
 		if (buffer_async_write(bh)) {
 			clear_buffer_dirty(bh);
-			submit_bh(WRITE, bh);
+			submit_bh(REQ_OP_WRITE, 0, bh);
 			nr++;
 		}
 		put_bh(bh);
diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index 9d6486d..df69581 100644
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -654,7 +654,7 @@ static void submit_logged_buffer(struct buffer_head *bh)
 		BUG();
 	if (!buffer_uptodate(bh))
 		BUG();
-	submit_bh(WRITE, bh);
+	submit_bh(REQ_OP_WRITE, 0, bh);
 }
 
 static void submit_ordered_buffer(struct buffer_head *bh)
@@ -664,7 +664,7 @@ static void submit_ordered_buffer(struct buffer_head *bh)
 	clear_buffer_dirty(bh);
 	if (!buffer_uptodate(bh))
 		BUG();
-	submit_bh(WRITE, bh);
+	submit_bh(REQ_OP_WRITE, 0, bh);
 }
 
 #define CHUNK_SIZE 32
@@ -1113,7 +1113,8 @@ static int flush_commit_list(struct super_block *s,
 		mark_buffer_dirty(jl->j_commit_bh) ;
 		depth = reiserfs_write_unlock_nested(s);
 		if (reiserfs_barrier_flush(s))
-			__sync_dirty_buffer(jl->j_commit_bh, WRITE_FLUSH_FUA);
+			__sync_dirty_buffer(jl->j_commit_bh, REQ_OP_WRITE,
+					    WRITE_FLUSH_FUA);
 		else
 			sync_dirty_buffer(jl->j_commit_bh);
 		reiserfs_write_lock_nested(s, depth);
@@ -1271,7 +1272,8 @@ static int _update_journal_header_block(struct super_block *sb,
 		depth = reiserfs_write_unlock_nested(sb);
 
 		if (reiserfs_barrier_flush(sb))
-			__sync_dirty_buffer(journal->j_header_bh, WRITE_FLUSH_FUA);
+			__sync_dirty_buffer(journal->j_header_bh, REQ_OP_WRITE,
+					    WRITE_FLUSH_FUA);
 		else
 			sync_dirty_buffer(journal->j_header_bh);
 
@@ -2271,7 +2273,7 @@ abort_replay:
 	/* flush out the real blocks */
 	for (i = 0; i < get_desc_trans_len(desc); i++) {
 		set_buffer_dirty(real_blocks[i]);
-		write_dirty_buffer(real_blocks[i], WRITE);
+		write_dirty_buffer(real_blocks[i], 0);
 	}
 	for (i = 0; i < get_desc_trans_len(desc); i++) {
 		wait_on_buffer(real_blocks[i]);
diff --git a/fs/ufs/util.c b/fs/ufs/util.c
index b6c2f94..5f68b1a 100644
--- a/fs/ufs/util.c
+++ b/fs/ufs/util.c
@@ -118,7 +118,7 @@ void ubh_sync_block(struct ufs_buffer_head *ubh)
 		unsigned i;
 
 		for (i = 0; i < ubh->count; i++)
-			write_dirty_buffer(ubh->bh[i], WRITE);
+			write_dirty_buffer(ubh->bh[i], 0);
 
 		for (i = 0; i < ubh->count; i++)
 			wait_on_buffer(ubh->bh[i]);
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index e6797de..6edc8dd 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -189,10 +189,11 @@ void unlock_buffer(struct buffer_head *bh);
 void __lock_buffer(struct buffer_head *bh);
 void ll_rw_block(int, int, struct buffer_head * bh[]);
 int sync_dirty_buffer(struct buffer_head *bh);
-int __sync_dirty_buffer(struct buffer_head *bh, int rw);
-void write_dirty_buffer(struct buffer_head *bh, int rw);
-int _submit_bh(int rw, struct buffer_head *bh, unsigned long bio_flags);
-int submit_bh(int, struct buffer_head *);
+int __sync_dirty_buffer(struct buffer_head *bh, int op, int op_flags);
+void write_dirty_buffer(struct buffer_head *bh, int op_flags);
+int _submit_bh(int op, int op_flags, struct buffer_head *bh,
+	       unsigned long bio_flags);
+int submit_bh(int, int, struct buffer_head *);
 void write_boundary_block(struct block_device *bdev,
 			sector_t bblock, unsigned blocksize);
 int bh_uptodate_or_lock(struct buffer_head *bh);
-- 
1.8.3.1

[PATCH 17/32] block: add operation field to bio struct

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch adds field to the bio to store the REQ_OP, and it
has the block layer code set it.

The next patches will modify the other drivers and filesystems
to also set the bi_op. We are still ORing the op into the bi_rw.
When I am done with the conversion, that will be dropped.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 block/bio.c               | 11 +++++++++--
 block/blk-core.c          |  1 +
 block/blk-map.c           |  4 +++-
 include/linux/blk_types.h |  8 +++++++-
 4 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index ae91ccb..1cf8428 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -582,6 +582,7 @@ void __bio_clone_fast(struct bio *bio, struct bio *bio_src)
 	bio->bi_bdev = bio_src->bi_bdev;
 	bio_set_flag(bio, BIO_CLONED);
 	bio->bi_rw = bio_src->bi_rw;
+	bio->bi_op = bio_src->bi_op;
 	bio->bi_iter = bio_src->bi_iter;
 	bio->bi_io_vec = bio_src->bi_io_vec;
 }
@@ -664,6 +665,7 @@ struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
 
 	bio->bi_bdev		= bio_src->bi_bdev;
 	bio->bi_rw		= bio_src->bi_rw;
+	bio->bi_op		= bio_src->bi_op;
 	bio->bi_iter.bi_sector	= bio_src->bi_iter.bi_sector;
 	bio->bi_iter.bi_size	= bio_src->bi_iter.bi_size;
 
@@ -1168,8 +1170,10 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
 	if (!bio)
 		goto out_bmd;
 
-	if (iter->type & WRITE)
+	if (iter->type & WRITE) {
 		bio->bi_rw |= REQ_WRITE;
+		bio->bi_op = REQ_OP_WRITE;
+	}
 
 	ret = 0;
 
@@ -1338,8 +1342,10 @@ struct bio *bio_map_user_iov(struct request_queue *q,
 	/*
 	 * set data direction, and check if mapped pages need bouncing
 	 */
-	if (iter->type & WRITE)
+	if (iter->type & WRITE) {
 		bio->bi_rw |= REQ_WRITE;
+		bio->bi_op = REQ_OP_WRITE;
+	}
 
 	bio_set_flag(bio, BIO_USER_MAPPED);
 
@@ -1533,6 +1539,7 @@ struct bio *bio_copy_kern(struct request_queue *q, void *data, unsigned int len,
 	} else {
 		bio->bi_end_io = bio_copy_kern_endio;
 		bio->bi_rw |= REQ_WRITE;
+		bio->bi_op = REQ_OP_WRITE;
 	}
 
 	return bio;
diff --git a/block/blk-core.c b/block/blk-core.c
index d325ece..c8672f2 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1988,6 +1988,7 @@ EXPORT_SYMBOL(generic_make_request);
 void submit_bio(int op, int flags, struct bio *bio)
 {
 	bio->bi_rw |= op | flags;
+	bio->bi_op = op;
 
 	/*
 	 * If it's a regular read/write or a barrier with data attached,
diff --git a/block/blk-map.c b/block/blk-map.c
index f565e11..4a91dc4 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -223,8 +223,10 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
 	if (IS_ERR(bio))
 		return PTR_ERR(bio);
 
-	if (!reading)
+	if (!reading) {
 		bio->bi_rw |= REQ_WRITE;
+		bio->bi_op = REQ_OP_WRITE;
+	}
 
 	if (do_copy)
 		rq->cmd_flags |= REQ_COPY_USER;
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index d7b6009..b974aea 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -48,9 +48,15 @@ struct bio {
 	struct block_device	*bi_bdev;
 	unsigned int		bi_flags;	/* status, command, etc */
 	int			bi_error;
-	unsigned long		bi_rw;		/* bottom bits READ/WRITE,
+	unsigned long		bi_rw;		/* bottom bits rq_flags_bits
 						 * top bits priority
 						 */
+	/*
+	 * this will be a u8 in the next patches and bi_rw can be shrunk to
+	 * a u32. For compat in these transistional patches op is a int here.
+	 */
+	int			bi_op;		/* REQ_OP */
+
 
 	struct bvec_iter	bi_iter;
 
-- 
1.8.3.1

[PATCH 18/32] drbd: set bio bi_op to REQ_OP

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch has drbd set the bi_op.

For compat reasons, we are still ORing the op into bi_rw. This
will be dropped in later patches in this series when everyone
is updated.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 drivers/block/drbd/drbd_actlog.c   |  1 +
 drivers/block/drbd/drbd_bitmap.c   |  1 +
 drivers/block/drbd/drbd_int.h      |  2 +-
 drivers/block/drbd/drbd_receiver.c | 39 ++++++++++++++++++++++++++++----------
 drivers/block/drbd/drbd_worker.c   |  3 ++-
 5 files changed, 34 insertions(+), 12 deletions(-)

diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index 5ad6b09..ed2eafe 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -160,6 +160,7 @@ static int _drbd_md_sync_page_io(struct drbd_device *device,
 	bio->bi_private = device;
 	bio->bi_end_io = drbd_md_endio;
 	bio->bi_rw = op | op_flags;
+	bio->bi_op = op;
 
 	if (op != REQ_OP_WRITE && device->state.disk == D_DISKLESS && device->ldev == NULL)
 		/* special case, drbd_md_read() during drbd_adm_attach(): no get_ldev */
diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index e8c65a4..2ff407a 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -1021,6 +1021,7 @@ static void bm_page_io_async(struct drbd_bm_aio_ctx *ctx, int page_nr) __must_ho
 	bio->bi_end_io = drbd_bm_endio;
 
 	if (drbd_insert_fault(device, (rw == REQ_OP_WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD)) {
+		bio->bi_op = rw;
 		bio->bi_rw |= rw;
 		bio_io_error(bio);
 	} else {
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 2934481..05eaba8 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1542,7 +1542,7 @@ extern bool drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector
 		bool throttle_if_app_is_waiting);
 extern int drbd_submit_peer_request(struct drbd_device *,
 				    struct drbd_peer_request *, const unsigned,
-				    const int);
+				    const unsigned, const int);
 extern int drbd_free_peer_reqs(struct drbd_device *, struct list_head *);
 extern struct drbd_peer_request *drbd_alloc_peer_req(struct drbd_peer_device *, u64,
 						     sector_t, unsigned int,
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index c097909..4e458bd 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -1365,7 +1365,8 @@ void drbd_bump_write_ordering(struct drbd_resource *resource, struct drbd_backin
 /* TODO allocate from our own bio_set. */
 int drbd_submit_peer_request(struct drbd_device *device,
 			     struct drbd_peer_request *peer_req,
-			     const unsigned rw, const int fault_type)
+			     const unsigned op, const unsigned op_flags,
+			     const int fault_type)
 {
 	struct bio *bios = NULL;
 	struct bio *bio;
@@ -1417,7 +1418,8 @@ next_bio:
 	/* > peer_req->i.sector, unless this is the first bio */
 	bio->bi_iter.bi_sector = sector;
 	bio->bi_bdev = device->ldev->backing_bdev;
-	bio->bi_rw = rw;
+	bio->bi_rw = op | op_flags;
+	bio->bi_op = op;
 	bio->bi_private = peer_req;
 	bio->bi_end_io = drbd_peer_request_endio;
 
@@ -1425,7 +1427,7 @@ next_bio:
 	bios = bio;
 	++n_bios;
 
-	if (rw & REQ_DISCARD) {
+	if (op & REQ_OP_DISCARD) {
 		bio->bi_iter.bi_size = data_size;
 		goto submit;
 	}
@@ -1803,7 +1805,8 @@ static int recv_resync_read(struct drbd_peer_device *peer_device, sector_t secto
 	spin_unlock_irq(&device->resource->req_lock);
 
 	atomic_add(pi->size >> 9, &device->rs_sect_ev);
-	if (drbd_submit_peer_request(device, peer_req, WRITE, DRBD_FAULT_RS_WR) == 0)
+	if (drbd_submit_peer_request(device, peer_req, REQ_OP_WRITE, 0,
+				     DRBD_FAULT_RS_WR) == 0)
 		return 0;
 
 	/* don't care for the reason here */
@@ -2125,7 +2128,7 @@ static int wait_for_and_update_peer_seq(struct drbd_peer_device *peer_device, co
 /* see also bio_flags_to_wire()
  * DRBD_REQ_*, because we need to semantically map the flags to data packet
  * flags and back. We may replicate to other kernel versions. */
-static unsigned long wire_flags_to_bio(u32 dpf)
+static unsigned long wire_flags_to_bio_flags(u32 dpf)
 {
 	return  (dpf & DP_RW_SYNC ? REQ_SYNC : 0) |
 		(dpf & DP_FUA ? REQ_FUA : 0) |
@@ -2133,6 +2136,14 @@ static unsigned long wire_flags_to_bio(u32 dpf)
 		(dpf & DP_DISCARD ? REQ_DISCARD : 0);
 }
 
+static unsigned long wire_flags_to_bio_op(u32 dpf)
+{
+	if (dpf & DP_DISCARD)
+		return REQ_OP_DISCARD;
+	else
+		return 0;
+}
+
 static void fail_postponed_requests(struct drbd_device *device, sector_t sector,
 				    unsigned int size)
 {
@@ -2276,7 +2287,7 @@ static int receive_Data(struct drbd_connection *connection, struct packet_info *
 	struct drbd_peer_request *peer_req;
 	struct p_data *p = pi->data;
 	u32 peer_seq = be32_to_cpu(p->seq_num);
-	int rw = WRITE;
+	int op = REQ_OP_WRITE, op_flags = 0;
 	u32 dp_flags;
 	int err, tp;
 
@@ -2315,14 +2326,20 @@ static int receive_Data(struct drbd_connection *connection, struct packet_info *
 	peer_req->flags |= EE_APPLICATION;
 
 	dp_flags = be32_to_cpu(p->dp_flags);
-	rw |= wire_flags_to_bio(dp_flags);
+	/*
+	 * Tmp compat. We OR it here because other code assumes both the
+	 * discard and write flags are set. In the next patches that
+	 * will be cleaned up.
+	 */
+	op |= wire_flags_to_bio_op(dp_flags);
+	op_flags |= wire_flags_to_bio_flags(dp_flags);
 	if (pi->cmd == P_TRIM) {
 		struct request_queue *q = bdev_get_queue(device->ldev->backing_bdev);
 		peer_req->flags |= EE_IS_TRIM;
 		if (!blk_queue_discard(q))
 			peer_req->flags |= EE_IS_TRIM_USE_ZEROOUT;
 		D_ASSERT(peer_device, peer_req->i.size > 0);
-		D_ASSERT(peer_device, rw & REQ_DISCARD);
+		D_ASSERT(peer_device, op & REQ_OP_DISCARD);
 		D_ASSERT(peer_device, peer_req->pages == NULL);
 	} else if (peer_req->pages == NULL) {
 		D_ASSERT(device, peer_req->i.size == 0);
@@ -2406,7 +2423,8 @@ static int receive_Data(struct drbd_connection *connection, struct packet_info *
 		peer_req->flags |= EE_CALL_AL_COMPLETE_IO;
 	}
 
-	err = drbd_submit_peer_request(device, peer_req, rw, DRBD_FAULT_DT_WR);
+	err = drbd_submit_peer_request(device, peer_req, op, op_flags,
+				       DRBD_FAULT_DT_WR);
 	if (!err)
 		return 0;
 
@@ -2696,7 +2714,8 @@ submit_for_resync:
 submit:
 	update_receiver_timing_details(connection, drbd_submit_peer_request);
 	inc_unacked(device);
-	if (drbd_submit_peer_request(device, peer_req, READ, fault_type) == 0)
+	if (drbd_submit_peer_request(device, peer_req, REQ_OP_READ, 0,
+				     fault_type) == 0)
 		return 0;
 
 	/* don't care for the reason here */
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index 5578c14..23e5500 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -387,7 +387,8 @@ static int read_for_csum(struct drbd_peer_device *peer_device, sector_t sector,
 	spin_unlock_irq(&device->resource->req_lock);
 
 	atomic_add(size >> 9, &device->rs_sect_ev);
-	if (drbd_submit_peer_request(device, peer_req, READ, DRBD_FAULT_RS_RD) == 0)
+	if (drbd_submit_peer_request(device, peer_req, REQ_OP_READ, 0,
+				     DRBD_FAULT_RS_RD) == 0)
 		return 0;
 
 	/* If it failed because of ENOMEM, retry should help.  If it failed
-- 
1.8.3.1

[PATCH 19/32] block: add helper to get data dir from op

[mchristi]

From: Mike Christie <mchristi@redhat.com>

In later patches the op will no longer be a bitmap, so we will
not have REQ_WRITE set for all non reads like discard, flush,
and write same. Drivers will still want to treat them as writes
for accounting reasons, so this patch adds a helper to translate
a op to a data direction.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 include/linux/blkdev.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 19c2e94..cf5f518 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -586,6 +586,18 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
 
 #define list_entry_rq(ptr)	list_entry((ptr), struct request, queuelist)
 
+/*
+ * Non REQ_OP_WRITE requests like discard, write same, etc, are
+ * considered WRITEs.
+ */
+static inline int op_to_data_dir(int op)
+{
+	if (op == REQ_OP_READ)
+		return READ;
+	else
+		return WRITE;
+}
+
 #define rq_data_dir(rq)		((int)((rq)->cmd_flags & 1))
 
 /*
-- 
1.8.3.1

[PATCH 20/32] md: set bi_op to REQ_OP

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch has md set the bi_op.

For compat reasons, we are still ORing the op into bi_rw. This
will be dropped in later patches in this series when everyone
is updated.

For discards, I am also still passing in REQ_WRITE in with the
flags, so code that has not yet been converted will work like
before. This will be cleaned up in later patches when everyone
is converted.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 drivers/md/raid1.c  |  9 +++++++++
 drivers/md/raid10.c | 13 +++++++++++++
 drivers/md/raid5.c  | 50 +++++++++++++++++++++++++++++++-------------------
 3 files changed, 53 insertions(+), 19 deletions(-)

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 527fdf5..94e5a63 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1051,6 +1051,7 @@ static void make_request(struct mddev *mddev, struct bio * bio)
 	int i, disks;
 	struct bitmap *bitmap;
 	unsigned long flags;
+	const int op = bio->bi_op;
 	const int rw = bio_data_dir(bio);
 	const unsigned long do_sync = (bio->bi_rw & REQ_SYNC);
 	const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA));
@@ -1164,6 +1165,7 @@ read_again:
 			mirror->rdev->data_offset;
 		read_bio->bi_bdev = mirror->rdev->bdev;
 		read_bio->bi_end_io = raid1_end_read_request;
+		read_bio->bi_op = REQ_OP_READ;
 		read_bio->bi_rw = READ | do_sync;
 		read_bio->bi_private = r1_bio;
 
@@ -1374,6 +1376,7 @@ read_again:
 				   conf->mirrors[i].rdev->data_offset);
 		mbio->bi_bdev = conf->mirrors[i].rdev->bdev;
 		mbio->bi_end_io	= raid1_end_write_request;
+		mbio->bi_op = op;
 		mbio->bi_rw =
 			WRITE | do_flush_fua | do_sync | do_discard | do_same;
 		mbio->bi_private = r1_bio;
@@ -2017,6 +2020,7 @@ static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio)
 		      !test_bit(MD_RECOVERY_SYNC, &mddev->recovery))))
 			continue;
 
+		wbio->bi_op = REQ_OP_WRITE;
 		wbio->bi_rw = WRITE;
 		wbio->bi_end_io = end_sync_write;
 		atomic_inc(&r1_bio->remaining);
@@ -2188,6 +2192,7 @@ static int narrow_write_error(struct r1bio *r1_bio, int i)
 			wbio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev);
 		}
 
+		wbio->bi_op = REQ_OP_WRITE;
 		wbio->bi_rw = WRITE;
 		wbio->bi_iter.bi_sector = r1_bio->sector;
 		wbio->bi_iter.bi_size = r1_bio->sectors << 9;
@@ -2329,6 +2334,7 @@ read_more:
 		bio->bi_iter.bi_sector = r1_bio->sector + rdev->data_offset;
 		bio->bi_bdev = rdev->bdev;
 		bio->bi_end_io = raid1_end_read_request;
+		bio->bi_op  = REQ_OP_READ;
 		bio->bi_rw = READ | do_sync;
 		bio->bi_private = r1_bio;
 		if (max_sectors < r1_bio->sectors) {
@@ -2544,6 +2550,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
 			if (i < conf->raid_disks)
 				still_degraded = 1;
 		} else if (!test_bit(In_sync, &rdev->flags)) {
+			bio->bi_op = REQ_OP_WRITE;
 			bio->bi_rw = WRITE;
 			bio->bi_end_io = end_sync_write;
 			write_targets ++;
@@ -2571,6 +2578,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
 					if (disk < 0)
 						disk = i;
 				}
+				bio->bi_op = REQ_OP_READ;
 				bio->bi_rw = READ;
 				bio->bi_end_io = end_sync_read;
 				read_targets++;
@@ -2583,6 +2591,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
 				 * if we are doing resync or repair. Otherwise, leave
 				 * this device alone for this sync request.
 				 */
+				bio->bi_op = REQ_OP_WRITE;
 				bio->bi_rw = WRITE;
 				bio->bi_end_io = end_sync_write;
 				write_targets++;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 69352a6..c7430f9 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1058,6 +1058,7 @@ static void __make_request(struct mddev *mddev, struct bio *bio)
 	struct r10bio *r10_bio;
 	struct bio *read_bio;
 	int i;
+	const int op = bio->bi_op;
 	const int rw = bio_data_dir(bio);
 	const unsigned long do_sync = (bio->bi_rw & REQ_SYNC);
 	const unsigned long do_fua = (bio->bi_rw & REQ_FUA);
@@ -1156,6 +1157,7 @@ read_again:
 			choose_data_offset(r10_bio, rdev);
 		read_bio->bi_bdev = rdev->bdev;
 		read_bio->bi_end_io = raid10_end_read_request;
+		read_bio->bi_op = REQ_OP_READ;
 		read_bio->bi_rw = READ | do_sync;
 		read_bio->bi_private = r10_bio;
 
@@ -1363,6 +1365,7 @@ retry_write:
 							      rdev));
 			mbio->bi_bdev = rdev->bdev;
 			mbio->bi_end_io	= raid10_end_write_request;
+			mbio->bi_op = op;
 			mbio->bi_rw =
 				WRITE | do_sync | do_fua | do_discard | do_same;
 			mbio->bi_private = r10_bio;
@@ -1406,6 +1409,7 @@ retry_write:
 						   r10_bio, rdev));
 			mbio->bi_bdev = rdev->bdev;
 			mbio->bi_end_io	= raid10_end_write_request;
+			mbio->bi_op = op;
 			mbio->bi_rw =
 				WRITE | do_sync | do_fua | do_discard | do_same;
 			mbio->bi_private = r10_bio;
@@ -1988,6 +1992,7 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio)
 
 		tbio->bi_vcnt = vcnt;
 		tbio->bi_iter.bi_size = r10_bio->sectors << 9;
+		tbio->bi_op = REQ_OP_WRITE;
 		tbio->bi_rw = WRITE;
 		tbio->bi_private = r10_bio;
 		tbio->bi_iter.bi_sector = r10_bio->devs[i].addr;
@@ -2544,6 +2549,7 @@ read_more:
 	bio->bi_iter.bi_sector = r10_bio->devs[slot].addr
 		+ choose_data_offset(r10_bio, rdev);
 	bio->bi_bdev = rdev->bdev;
+	bio->bi_op = REQ_OP_READ;
 	bio->bi_rw = READ | do_sync;
 	bio->bi_private = r10_bio;
 	bio->bi_end_io = raid10_end_read_request;
@@ -3031,6 +3037,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
 				biolist = bio;
 				bio->bi_private = r10_bio;
 				bio->bi_end_io = end_sync_read;
+				bio->bi_op = REQ_OP_READ;
 				bio->bi_rw = READ;
 				from_addr = r10_bio->devs[j].addr;
 				bio->bi_iter.bi_sector = from_addr +
@@ -3057,6 +3064,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
 					biolist = bio;
 					bio->bi_private = r10_bio;
 					bio->bi_end_io = end_sync_write;
+					bio->bi_op = REQ_OP_WRITE;
 					bio->bi_rw = WRITE;
 					bio->bi_iter.bi_sector = to_addr
 						+ rdev->data_offset;
@@ -3086,6 +3094,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
 				biolist = bio;
 				bio->bi_private = r10_bio;
 				bio->bi_end_io = end_sync_write;
+				bio->bi_op = REQ_OP_WRITE;
 				bio->bi_rw = WRITE;
 				bio->bi_iter.bi_sector = to_addr +
 					rdev->data_offset;
@@ -3206,6 +3215,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
 			biolist = bio;
 			bio->bi_private = r10_bio;
 			bio->bi_end_io = end_sync_read;
+			bio->bi_op = REQ_OP_READ;
 			bio->bi_rw = READ;
 			bio->bi_iter.bi_sector = sector +
 				conf->mirrors[d].rdev->data_offset;
@@ -3228,6 +3238,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
 			biolist = bio;
 			bio->bi_private = r10_bio;
 			bio->bi_end_io = end_sync_write;
+			bio->bi_op = REQ_OP_WRITE;
 			bio->bi_rw = WRITE;
 			bio->bi_iter.bi_sector = sector +
 				conf->mirrors[d].replacement->data_offset;
@@ -4311,6 +4322,7 @@ read_more:
 			       + rdev->data_offset);
 	read_bio->bi_private = r10_bio;
 	read_bio->bi_end_io = end_sync_read;
+	read_bio->bi_op = REQ_OP_READ;
 	read_bio->bi_rw = READ;
 	read_bio->bi_flags &= (~0UL << BIO_RESET_BITS);
 	read_bio->bi_error = 0;
@@ -4345,6 +4357,7 @@ read_more:
 			rdev2->new_data_offset;
 		b->bi_private = r10_bio;
 		b->bi_end_io = end_reshape_write;
+		b->bi_op = REQ_OP_WRITE;
 		b->bi_rw = WRITE;
 		b->bi_next = blist;
 		blist = b;
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 49bb8d3..7480155 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -896,29 +896,39 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
 	might_sleep();
 
 	for (i = disks; i--; ) {
-		int rw;
+		int op;
+		int op_flags = 0;
 		int replace_only = 0;
 		struct bio *bi, *rbi;
 		struct md_rdev *rdev, *rrdev = NULL;
 
 		sh = head_sh;
 		if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) {
-			if (test_and_clear_bit(R5_WantFUA, &sh->dev[i].flags))
-				rw = WRITE_FUA;
-			else
-				rw = WRITE;
-			if (test_bit(R5_Discard, &sh->dev[i].flags))
-				rw |= REQ_DISCARD;
+			if (test_and_clear_bit(R5_WantFUA, &sh->dev[i].flags)) {
+				op = REQ_OP_WRITE;
+				op_flags = WRITE_FUA;
+			} else {
+				op = REQ_OP_WRITE;
+			}
+			if (test_bit(R5_Discard, &sh->dev[i].flags)) {
+				op = REQ_OP_DISCARD;
+				/*
+				 * this temporary for compat because drivers
+				 * expected this to be set for discards. It
+				 * will be removed in the next patches.
+				 */
+				op_flags |= REQ_WRITE;
+			}
 		} else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags))
-			rw = READ;
+			op = REQ_OP_READ;
 		else if (test_and_clear_bit(R5_WantReplace,
 					    &sh->dev[i].flags)) {
-			rw = WRITE;
+			op = REQ_OP_WRITE;
 			replace_only = 1;
 		} else
 			continue;
 		if (test_and_clear_bit(R5_SyncIO, &sh->dev[i].flags))
-			rw |= REQ_SYNC;
+			op_flags |= REQ_SYNC;
 
 again:
 		bi = &sh->dev[i].req;
@@ -932,7 +942,7 @@ again:
 			rdev = rrdev;
 			rrdev = NULL;
 		}
-		if (rw & WRITE) {
+		if (op_to_data_dir(op) == WRITE) {
 			if (replace_only)
 				rdev = NULL;
 			if (rdev == rrdev)
@@ -958,7 +968,7 @@ again:
 		 * need to check for writes.  We never accept write errors
 		 * on the replacement, so we don't to check rrdev.
 		 */
-		while ((rw & WRITE) && rdev &&
+		while ((op_to_data_dir(op) == WRITE) && rdev &&
 		       test_bit(WriteErrorSeen, &rdev->flags)) {
 			sector_t first_bad;
 			int bad_sectors;
@@ -1000,8 +1010,9 @@ again:
 
 			bio_reset(bi);
 			bi->bi_bdev = rdev->bdev;
-			bi->bi_rw = rw;
-			bi->bi_end_io = (rw & WRITE)
+			bi->bi_op = op;
+			bi->bi_rw = op | op_flags;
+			bi->bi_end_io = (op_to_data_dir(op) == WRITE)
 				? raid5_end_write_request
 				: raid5_end_read_request;
 			bi->bi_private = sh;
@@ -1032,7 +1043,7 @@ again:
 			 * If this is discard request, set bi_vcnt 0. We don't
 			 * want to confuse SCSI because SCSI will replace payload
 			 */
-			if (rw & REQ_DISCARD)
+			if (op == REQ_OP_DISCARD)
 				bi->bi_vcnt = 0;
 			if (rrdev)
 				set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags);
@@ -1052,8 +1063,9 @@ again:
 
 			bio_reset(rbi);
 			rbi->bi_bdev = rrdev->bdev;
-			rbi->bi_rw = rw;
-			BUG_ON(!(rw & WRITE));
+			rbi->bi_op = op;
+			rbi->bi_rw = op | op_flags;
+			BUG_ON(!(op_to_data_dir(op)));
 			rbi->bi_end_io = raid5_end_write_request;
 			rbi->bi_private = sh;
 
@@ -1081,7 +1093,7 @@ again:
 			 * If this is discard request, set bi_vcnt 0. We don't
 			 * want to confuse SCSI because SCSI will replace payload
 			 */
-			if (rw & REQ_DISCARD)
+			if (op == REQ_OP_DISCARD)
 				rbi->bi_vcnt = 0;
 			if (conf->mddev->gendisk)
 				trace_block_bio_remap(bdev_get_queue(rbi->bi_bdev),
@@ -1090,7 +1102,7 @@ again:
 			generic_make_request(rbi);
 		}
 		if (!rdev && !rrdev) {
-			if (rw & WRITE)
+			if (op_to_data_dir(op) == WRITE)
 				set_bit(STRIPE_DEGRADED, &sh->state);
 			pr_debug("skip op %ld on disc %d for sector %llu\n",
 				bi->bi_rw, i, (unsigned long long)sh->sector);
-- 
1.8.3.1

[PATCH 21/32] bcache: set bi_op to REQ_OP

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch has bcache set the bi_op.

For compat reasons, we are still ORing the op into bi_rw. This
will be dropped in later patches in this series when everyone
is updated.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 drivers/md/bcache/btree.c     |  2 ++
 drivers/md/bcache/journal.c   |  3 +++
 drivers/md/bcache/movinggc.c  |  1 +
 drivers/md/bcache/request.c   |  2 ++
 drivers/md/bcache/super.c     | 24 ++++++++++++++----------
 drivers/md/bcache/writeback.c |  2 ++
 6 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index 83392f8..3be5b05 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -295,6 +295,7 @@ static void bch_btree_node_read(struct btree *b)
 	closure_init_stack(&cl);
 
 	bio = bch_bbio_alloc(b->c);
+	bio->bi_op	= REQ_OP_READ;
 	bio->bi_rw	= REQ_META|READ_SYNC;
 	bio->bi_iter.bi_size = KEY_SIZE(&b->key) << 9;
 	bio->bi_end_io	= btree_node_read_endio;
@@ -397,6 +398,7 @@ static void do_btree_node_write(struct btree *b)
 
 	b->bio->bi_end_io	= btree_node_write_endio;
 	b->bio->bi_private	= cl;
+	b->bio->bi_op		= REQ_OP_WRITE;
 	b->bio->bi_rw		= REQ_META|WRITE_SYNC|REQ_FUA;
 	b->bio->bi_iter.bi_size	= roundup(set_bytes(i), block_bytes(b->c));
 	bch_bio_map(b->bio, i);
diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index ba9192b..d152e78 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -54,6 +54,7 @@ reread:		left = ca->sb.bucket_size - offset;
 		bio_reset(bio);
 		bio->bi_iter.bi_sector	= bucket + offset;
 		bio->bi_bdev	= ca->bdev;
+		bio->bi_op	= REQ_OP_READ;
 		bio->bi_rw	= READ;
 		bio->bi_iter.bi_size	= len << 9;
 
@@ -452,6 +453,7 @@ static void do_journal_discard(struct cache *ca)
 		bio->bi_iter.bi_sector	= bucket_to_sector(ca->set,
 						ca->sb.d[ja->discard_idx]);
 		bio->bi_bdev		= ca->bdev;
+		bio->bi_op		= REQ_OP_DISCARD;
 		bio->bi_rw		= REQ_WRITE|REQ_DISCARD;
 		bio->bi_max_vecs	= 1;
 		bio->bi_io_vec		= bio->bi_inline_vecs;
@@ -626,6 +628,7 @@ static void journal_write_unlocked(struct closure *cl)
 		bio_reset(bio);
 		bio->bi_iter.bi_sector	= PTR_OFFSET(k, i);
 		bio->bi_bdev	= ca->bdev;
+		bio->bi_op	= REQ_OP_WRITE;
 		bio->bi_rw	= REQ_WRITE|REQ_SYNC|REQ_META|REQ_FLUSH|REQ_FUA;
 		bio->bi_iter.bi_size = sectors << 9;
 
diff --git a/drivers/md/bcache/movinggc.c b/drivers/md/bcache/movinggc.c
index b929fc9..1318f32 100644
--- a/drivers/md/bcache/movinggc.c
+++ b/drivers/md/bcache/movinggc.c
@@ -163,6 +163,7 @@ static void read_moving(struct cache_set *c)
 		moving_init(io);
 		bio = &io->bio.bio;
 
+		bio->bi_op	= REQ_OP_READ;
 		bio->bi_rw	= READ;
 		bio->bi_end_io	= read_moving_endio;
 
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 8e9877b..7a84f3b 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -253,6 +253,7 @@ static void bch_data_insert_start(struct closure *cl)
 		trace_bcache_cache_insert(k);
 		bch_keylist_push(&op->insert_keys);
 
+		n->bi_op = REQ_OP_WRITE;
 		n->bi_rw |= REQ_WRITE;
 		bch_submit_bbio(n, op->c, k, 0);
 	} while (n != bio);
@@ -925,6 +926,7 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
 			struct bio *flush = bio_alloc_bioset(GFP_NOIO, 0,
 							     dc->disk.bio_split);
 
+			flush->bi_op	= REQ_OP_WRITE;
 			flush->bi_rw	= WRITE_FLUSH;
 			flush->bi_bdev	= bio->bi_bdev;
 			flush->bi_end_io = request_endio;
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index a987c90..ccc6266 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -212,6 +212,7 @@ static void __write_super(struct cache_sb *sb, struct bio *bio)
 	unsigned i;
 
 	bio->bi_iter.bi_sector	= SB_SECTOR;
+	bio->bi_op		= 0;
 	bio->bi_rw		= REQ_SYNC|REQ_META;
 	bio->bi_iter.bi_size	= SB_SIZE;
 	bch_bio_map(bio, NULL);
@@ -333,7 +334,7 @@ static void uuid_io_unlock(struct closure *cl)
 	up(&c->uuid_write_mutex);
 }
 
-static void uuid_io(struct cache_set *c, unsigned long rw,
+static void uuid_io(struct cache_set *c, int op, unsigned long op_flags,
 		    struct bkey *k, struct closure *parent)
 {
 	struct closure *cl = &c->uuid_write;
@@ -348,7 +349,8 @@ static void uuid_io(struct cache_set *c, unsigned long rw,
 	for (i = 0; i < KEY_PTRS(k); i++) {
 		struct bio *bio = bch_bbio_alloc(c);
 
-		bio->bi_rw	= REQ_SYNC|REQ_META|rw;
+		bio->bi_op	= op;
+		bio->bi_rw	= REQ_SYNC|REQ_META|op_flags;
 		bio->bi_iter.bi_size = KEY_SIZE(k) << 9;
 
 		bio->bi_end_io	= uuid_endio;
@@ -357,12 +359,12 @@ static void uuid_io(struct cache_set *c, unsigned long rw,
 
 		bch_submit_bbio(bio, c, k, i);
 
-		if (!(rw & WRITE))
+		if (op != REQ_OP_WRITE)
 			break;
 	}
 
 	bch_extent_to_text(buf, sizeof(buf), k);
-	pr_debug("%s UUIDs at %s", rw & REQ_WRITE ? "wrote" : "read", buf);
+	pr_debug("%s UUIDs at %s", op == REQ_OP_WRITE ? "wrote" : "read", buf);
 
 	for (u = c->uuids; u < c->uuids + c->nr_uuids; u++)
 		if (!bch_is_zero(u->uuid, 16))
@@ -381,7 +383,7 @@ static char *uuid_read(struct cache_set *c, struct jset *j, struct closure *cl)
 		return "bad uuid pointer";
 
 	bkey_copy(&c->uuid_bucket, k);
-	uuid_io(c, READ_SYNC, k, cl);
+	uuid_io(c, REQ_OP_READ, READ_SYNC, k, cl);
 
 	if (j->version < BCACHE_JSET_VERSION_UUIDv1) {
 		struct uuid_entry_v0	*u0 = (void *) c->uuids;
@@ -426,7 +428,7 @@ static int __uuid_write(struct cache_set *c)
 		return 1;
 
 	SET_KEY_SIZE(&k.key, c->sb.bucket_size);
-	uuid_io(c, REQ_WRITE, &k.key, &cl);
+	uuid_io(c, REQ_OP_WRITE, 0, &k.key, &cl);
 	closure_sync(&cl);
 
 	bkey_copy(&c->uuid_bucket, &k.key);
@@ -498,7 +500,8 @@ static void prio_endio(struct bio *bio)
 	closure_put(&ca->prio);
 }
 
-static void prio_io(struct cache *ca, uint64_t bucket, unsigned long rw)
+static void prio_io(struct cache *ca, uint64_t bucket, int op,
+		    unsigned long op_flags)
 {
 	struct closure *cl = &ca->prio;
 	struct bio *bio = bch_bbio_alloc(ca->set);
@@ -507,7 +510,8 @@ static void prio_io(struct cache *ca, uint64_t bucket, unsigned long rw)
 
 	bio->bi_iter.bi_sector	= bucket * ca->sb.bucket_size;
 	bio->bi_bdev		= ca->bdev;
-	bio->bi_rw		= REQ_SYNC|REQ_META|rw;
+	bio->bi_op		= op;
+	bio->bi_rw		= REQ_SYNC|REQ_META|op_flags;
 	bio->bi_iter.bi_size	= bucket_bytes(ca);
 
 	bio->bi_end_io	= prio_endio;
@@ -557,7 +561,7 @@ void bch_prio_write(struct cache *ca)
 		BUG_ON(bucket == -1);
 
 		mutex_unlock(&ca->set->bucket_lock);
-		prio_io(ca, bucket, REQ_WRITE);
+		prio_io(ca, bucket, REQ_OP_WRITE, 0);
 		mutex_lock(&ca->set->bucket_lock);
 
 		ca->prio_buckets[i] = bucket;
@@ -599,7 +603,7 @@ static void prio_read(struct cache *ca, uint64_t bucket)
 			ca->prio_last_buckets[bucket_nr] = bucket;
 			bucket_nr++;
 
-			prio_io(ca, bucket, READ_SYNC);
+			prio_io(ca, bucket, REQ_OP_READ, READ_SYNC);
 
 			if (p->csum != bch_crc64(&p->magic, bucket_bytes(ca) - 8))
 				pr_warn("bad csum reading priorities");
diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
index b23f88d..28b1bae 100644
--- a/drivers/md/bcache/writeback.c
+++ b/drivers/md/bcache/writeback.c
@@ -183,6 +183,7 @@ static void write_dirty(struct closure *cl)
 	struct keybuf_key *w = io->bio.bi_private;
 
 	dirty_init(w);
+	io->bio.bi_op		= REQ_OP_WRITE;
 	io->bio.bi_rw		= WRITE;
 	io->bio.bi_iter.bi_sector = KEY_START(&w->key);
 	io->bio.bi_bdev		= io->dc->bdev;
@@ -256,6 +257,7 @@ static void read_dirty(struct cached_dev *dc)
 		io->bio.bi_iter.bi_sector = PTR_OFFSET(&w->key, 0);
 		io->bio.bi_bdev		= PTR_CACHE(dc->disk.c,
 						    &w->key, 0)->bdev;
+		io->bio.bi_op		= REQ_OP_READ;
 		io->bio.bi_rw		= READ;
 		io->bio.bi_end_io	= read_dirty_endio;
 
-- 
1.8.3.1

[PATCH 22/32] block/fs/drivers: set bi_op to REQ_OP

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch sets the bi_op to a REQ_OP for users where it
was a simple one line change.

For compat reasons, we are still ORing the op into bi_rw. This
will be dropped in later patches in this series when everyone
is updated.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 drivers/block/pktcdvd.c            | 2 ++
 drivers/md/dm-crypt.c              | 1 +
 drivers/md/dm.c                    | 1 +
 drivers/scsi/osd/osd_initiator.c   | 4 ++++
 drivers/target/target_core_pscsi.c | 4 +++-
 fs/btrfs/volumes.c                 | 1 +
 fs/exofs/ore.c                     | 1 +
 7 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 7be2375..bbb7a45 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -1075,6 +1075,7 @@ static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
 
 		atomic_inc(&pkt->io_wait);
 		bio->bi_rw = READ;
+		bio->bi_op = REQ_OP_READ;
 		pkt_queue_bio(pd, bio);
 		frames_read++;
 	}
@@ -1337,6 +1338,7 @@ static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
 	/* Start the write request */
 	atomic_set(&pkt->io_wait, 1);
 	pkt->w_bio->bi_rw = WRITE;
+	pkt->w_bio->bi_op = REQ_OP_WRITE;
 	pkt_queue_bio(pd, pkt->w_bio);
 }
 
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 4b3b6f8..92689e5 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1132,6 +1132,7 @@ static void clone_init(struct dm_crypt_io *io, struct bio *clone)
 	clone->bi_private = io;
 	clone->bi_end_io  = crypt_endio;
 	clone->bi_bdev    = cc->dev->bdev;
+	clone->bi_op      = io->base_bio->bi_op;
 	clone->bi_rw      = io->base_bio->bi_rw;
 }
 
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 1b5c604..d2cf6d9 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2329,6 +2329,7 @@ static struct mapped_device *alloc_dev(int minor)
 
 	bio_init(&md->flush_bio);
 	md->flush_bio.bi_bdev = md->bdev;
+	md->flush_bio.bi_op = REQ_OP_WRITE;
 	md->flush_bio.bi_rw = WRITE_FLUSH;
 
 	dm_stats_init(&md->stats);
diff --git a/drivers/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
index 0cccd60..ca7b4b6 100644
--- a/drivers/scsi/osd/osd_initiator.c
+++ b/drivers/scsi/osd/osd_initiator.c
@@ -729,6 +729,7 @@ static int _osd_req_list_objects(struct osd_request *or,
 		return PTR_ERR(bio);
 	}
 
+	bio->bi_op = REQ_OP_READ;
 	bio->bi_rw &= ~REQ_WRITE;
 	or->in.bio = bio;
 	or->in.total_bytes = bio->bi_iter.bi_size;
@@ -842,6 +843,7 @@ int osd_req_write_kern(struct osd_request *or,
 	if (IS_ERR(bio))
 		return PTR_ERR(bio);
 
+	bio->bi_op = REQ_OP_WRITE;
 	bio->bi_rw |= REQ_WRITE; /* FIXME: bio_set_dir() */
 	osd_req_write(or, obj, offset, bio, len);
 	return 0;
@@ -959,6 +961,7 @@ static int _osd_req_finalize_cdb_cont(struct osd_request *or, const u8 *cap_key)
 	if (IS_ERR(bio))
 		return PTR_ERR(bio);
 
+	bio->bi_op = REQ_OP_WRITE;
 	bio->bi_rw |= REQ_WRITE;
 
 	/* integrity check the continuation before the bio is linked
@@ -1080,6 +1083,7 @@ int osd_req_write_sg_kern(struct osd_request *or,
 	if (IS_ERR(bio))
 		return PTR_ERR(bio);
 
+	bio->bi_op = REQ_OP_WRITE;
 	bio->bi_rw |= REQ_WRITE;
 	osd_req_write_sg(or, obj, bio, sglist, numentries);
 
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index de18790..00a7bda5 100644
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -921,8 +921,10 @@ pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
 				if (!bio)
 					goto fail;
 
-				if (rw)
+				if (rw) {
+					bio->bi_op = REQ_OP_WRITE;
 					bio->bi_rw |= REQ_WRITE;
+				}
 
 				pr_debug("PSCSI: Allocated bio: %p,"
 					" dir: %s nr_vecs: %d\n", bio,
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 3dfac71..ef67c2f 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5847,6 +5847,7 @@ static noinline void btrfs_schedule_bio(struct btrfs_root *root,
 	atomic_inc(&root->fs_info->nr_async_bios);
 	WARN_ON(bio->bi_next);
 	bio->bi_next = NULL;
+	bio->bi_op = op;
 	bio->bi_rw |= op | op_flags;
 
 	spin_lock(&device->io_lock);
diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c
index 7bd8ac8..7339bef 100644
--- a/fs/exofs/ore.c
+++ b/fs/exofs/ore.c
@@ -878,6 +878,7 @@ static int _write_mirror(struct ore_io_state *ios, int cur_comp)
 			} else {
 				bio = master_dev->bio;
 				/* FIXME: bio_set_dir() */
+				bio->bi_op = REQ_OP_WRITE;
 				bio->bi_rw |= REQ_WRITE;
 			}
 
-- 
1.8.3.1

[PATCH 23/32] block/fs: pass in op and flags to ll_rw_block

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This has ll_rw_block users pass in the request op and flags seperately
instead of as a bitmap.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 fs/buffer.c                 | 19 ++++++++++---------
 fs/ext4/inode.c             |  6 +++---
 fs/ext4/namei.c             |  3 ++-
 fs/ext4/super.c             |  2 +-
 fs/gfs2/bmap.c              |  2 +-
 fs/gfs2/meta_io.c           |  4 ++--
 fs/gfs2/quota.c             |  2 +-
 fs/isofs/compress.c         |  2 +-
 fs/jbd2/journal.c           |  2 +-
 fs/jbd2/recovery.c          |  4 ++--
 fs/ocfs2/aops.c             |  2 +-
 fs/ocfs2/super.c            |  2 +-
 fs/reiserfs/journal.c       |  8 ++++----
 fs/reiserfs/stree.c         |  4 ++--
 fs/reiserfs/super.c         |  2 +-
 fs/squashfs/block.c         |  4 ++--
 fs/udf/dir.c                |  2 +-
 fs/udf/directory.c          |  2 +-
 fs/udf/inode.c              |  2 +-
 fs/ufs/balloc.c             |  2 +-
 include/linux/buffer_head.h |  2 +-
 21 files changed, 40 insertions(+), 38 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index cd07d86..ba84126 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -595,7 +595,7 @@ void write_boundary_block(struct block_device *bdev,
 	struct buffer_head *bh = __find_get_block(bdev, bblock + 1, blocksize);
 	if (bh) {
 		if (buffer_dirty(bh))
-			ll_rw_block(WRITE, 1, &bh);
+			ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
 		put_bh(bh);
 	}
 }
@@ -1406,7 +1406,7 @@ void __breadahead(struct block_device *bdev, sector_t block, unsigned size)
 {
 	struct buffer_head *bh = __getblk(bdev, block, size);
 	if (likely(bh)) {
-		ll_rw_block(READA, 1, &bh);
+		ll_rw_block(REQ_OP_READ, REQ_RAHEAD, 1, &bh);
 		brelse(bh);
 	}
 }
@@ -1966,7 +1966,7 @@ int __block_write_begin(struct page *page, loff_t pos, unsigned len,
 		if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
 		    !buffer_unwritten(bh) &&
 		     (block_start < from || block_end > to)) {
-			ll_rw_block(READ, 1, &bh);
+			ll_rw_block(REQ_OP_READ, 0, 1, &bh);
 			*wait_bh++=bh;
 		}
 	}
@@ -2883,7 +2883,7 @@ int block_truncate_page(struct address_space *mapping,
 
 	if (!buffer_uptodate(bh) && !buffer_delay(bh) && !buffer_unwritten(bh)) {
 		err = -EIO;
-		ll_rw_block(READ, 1, &bh);
+		ll_rw_block(REQ_OP_READ, 0, 1, &bh);
 		wait_on_buffer(bh);
 		/* Uhhuh. Read error. Complain and punt. */
 		if (!buffer_uptodate(bh))
@@ -3081,7 +3081,8 @@ EXPORT_SYMBOL(submit_bh);
 
 /**
  * ll_rw_block: low-level access to block devices (DEPRECATED)
- * @rw: whether to %READ or %WRITE or maybe %READA (readahead)
+ * @op: REQ_OP_READ or REQ_OP_WRITE
+ * op_flags: rq_flag_bits
  * @nr: number of &struct buffer_heads in the array
  * @bhs: array of pointers to &struct buffer_head
  *
@@ -3104,7 +3105,7 @@ EXPORT_SYMBOL(submit_bh);
  * All of the buffers must be for the same device, and must also be a
  * multiple of the current approved size for the device.
  */
-void ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
+void ll_rw_block(int op, int op_flags, int nr, struct buffer_head *bhs[])
 {
 	int i;
 
@@ -3113,18 +3114,18 @@ void ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
 
 		if (!trylock_buffer(bh))
 			continue;
-		if (rw == WRITE) {
+		if (op == REQ_OP_WRITE) {
 			if (test_clear_buffer_dirty(bh)) {
 				bh->b_end_io = end_buffer_write_sync;
 				get_bh(bh);
-				submit_bh(REQ_OP_WRITE, 0, bh);
+				submit_bh(REQ_OP_WRITE, op_flags, bh);
 				continue;
 			}
 		} else {
 			if (!buffer_uptodate(bh)) {
 				bh->b_end_io = end_buffer_read_sync;
 				get_bh(bh);
-				submit_bh(rw, 0, bh);
+				submit_bh(REQ_OP_READ, op_flags, bh);
 				continue;
 			}
 		}
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index f34ef29..dd2e197 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -791,7 +791,7 @@ struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode,
 		return bh;
 	if (!bh || buffer_uptodate(bh))
 		return bh;
-	ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &bh);
+	ll_rw_block(REQ_OP_READ,  REQ_META | REQ_PRIO, 1, &bh);
 	wait_on_buffer(bh);
 	if (buffer_uptodate(bh))
 		return bh;
@@ -948,7 +948,7 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
 		if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
 		    !buffer_unwritten(bh) &&
 		    (block_start < from || block_end > to)) {
-			ll_rw_block(READ, 1, &bh);
+			ll_rw_block(REQ_OP_READ, 0, 1, &bh);
 			*wait_bh++ = bh;
 			decrypt = ext4_encrypted_inode(inode) &&
 				S_ISREG(inode->i_mode);
@@ -3383,7 +3383,7 @@ static int __ext4_block_zero_page_range(handle_t *handle,
 
 	if (!buffer_uptodate(bh)) {
 		err = -EIO;
-		ll_rw_block(READ, 1, &bh);
+		ll_rw_block(REQ_OP_READ, 0, 1, &bh);
 		wait_on_buffer(bh);
 		/* Uhhuh. Read error. Complain and punt. */
 		if (!buffer_uptodate(bh))
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 9f61e76..0336536 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1438,7 +1438,8 @@ restart:
 				}
 				bh_use[ra_max] = bh;
 				if (bh)
-					ll_rw_block(READ | REQ_META | REQ_PRIO,
+					ll_rw_block(REQ_OP_READ,
+						    REQ_META | REQ_PRIO,
 						    1, &bh);
 			}
 		}
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index d9e4329..037dd9e 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4512,7 +4512,7 @@ static journal_t *ext4_get_dev_journal(struct super_block *sb,
 		goto out_bdev;
 	}
 	journal->j_private = sb;
-	ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
+	ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
 	wait_on_buffer(journal->j_sb_buffer);
 	if (!buffer_uptodate(journal->j_sb_buffer)) {
 		ext4_msg(sb, KERN_ERR, "I/O error on journal device");
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 967154c..1a22952 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -974,7 +974,7 @@ static int gfs2_block_truncate_page(struct address_space *mapping, loff_t from)
 
 	if (!buffer_uptodate(bh)) {
 		err = -EIO;
-		ll_rw_block(READ, 1, &bh);
+		ll_rw_block(REQ_OP_READ, 0, 1, &bh);
 		wait_on_buffer(bh);
 		/* Uhhuh. Read error. Complain and punt. */
 		if (!buffer_uptodate(bh))
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index ff483bc..264c95c 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -379,7 +379,7 @@ struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
 	if (buffer_uptodate(first_bh))
 		goto out;
 	if (!buffer_locked(first_bh))
-		ll_rw_block(READ_SYNC | REQ_META, 1, &first_bh);
+		ll_rw_block(REQ_OP_READ, READ_SYNC | REQ_META, 1, &first_bh);
 
 	dblock++;
 	extlen--;
@@ -388,7 +388,7 @@ struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
 		bh = gfs2_getbuf(gl, dblock, CREATE);
 
 		if (!buffer_uptodate(bh) && !buffer_locked(bh))
-			ll_rw_block(READA | REQ_META, 1, &bh);
+			ll_rw_block(REQ_OP_READ, REQ_RAHEAD | REQ_META, 1, &bh);
 		brelse(bh);
 		dblock++;
 		extlen--;
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 3a31226..841f15a 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -697,7 +697,7 @@ static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
 		if (PageUptodate(page))
 			set_buffer_uptodate(bh);
 		if (!buffer_uptodate(bh)) {
-			ll_rw_block(READ | REQ_META, 1, &bh);
+			ll_rw_block(REQ_OP_READ, REQ_META, 1, &bh);
 			wait_on_buffer(bh);
 			if (!buffer_uptodate(bh))
 				goto unlock_out;
diff --git a/fs/isofs/compress.c b/fs/isofs/compress.c
index f311bf0..f9b5fc8 100644
--- a/fs/isofs/compress.c
+++ b/fs/isofs/compress.c
@@ -81,7 +81,7 @@ static loff_t zisofs_uncompress_block(struct inode *inode, loff_t block_start,
 	blocknum = block_start >> bufshift;
 	memset(bhs, 0, (needblocks + 1) * sizeof(struct buffer_head *));
 	haveblocks = isofs_get_blocks(inode, blocknum, bhs, needblocks);
-	ll_rw_block(READ, haveblocks, bhs);
+	ll_rw_block(REQ_OP_READ, 0, haveblocks, bhs);
 
 	curbh = 0;
 	curpage = 0;
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index e3855b0..4ba109f 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1474,7 +1474,7 @@ static int journal_get_superblock(journal_t *journal)
 
 	J_ASSERT(bh != NULL);
 	if (!buffer_uptodate(bh)) {
-		ll_rw_block(READ, 1, &bh);
+		ll_rw_block(REQ_OP_READ, 0, 1, &bh);
 		wait_on_buffer(bh);
 		if (!buffer_uptodate(bh)) {
 			printk(KERN_ERR
diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
index a9079d0..3147a89 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -104,7 +104,7 @@ static int do_readahead(journal_t *journal, unsigned int start)
 		if (!buffer_uptodate(bh) && !buffer_locked(bh)) {
 			bufs[nbufs++] = bh;
 			if (nbufs == MAXBUF) {
-				ll_rw_block(READ, nbufs, bufs);
+				ll_rw_block(REQ_OP_READ, 0, nbufs, bufs);
 				journal_brelse_array(bufs, nbufs);
 				nbufs = 0;
 			}
@@ -113,7 +113,7 @@ static int do_readahead(journal_t *journal, unsigned int start)
 	}
 
 	if (nbufs)
-		ll_rw_block(READ, nbufs, bufs);
+		ll_rw_block(REQ_OP_READ, 0, nbufs, bufs);
 	err = 0;
 
 failed:
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 64b11d9..247ad9d 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -1141,7 +1141,7 @@ int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
 			   !buffer_new(bh) &&
 			   ocfs2_should_read_blk(inode, page, block_start) &&
 			   (block_start < from || block_end > to)) {
-			ll_rw_block(READ, 1, &bh);
+			ll_rw_block(REQ_OP_READ, 0, 1, &bh);
 			*wait_bh++=bh;
 		}
 
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 2de4c8a..e860b60 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1837,7 +1837,7 @@ static int ocfs2_get_sector(struct super_block *sb,
 	if (!buffer_dirty(*bh))
 		clear_buffer_uptodate(*bh);
 	unlock_buffer(*bh);
-	ll_rw_block(READ, 1, bh);
+	ll_rw_block(REQ_OP_READ, 0, 1, bh);
 	wait_on_buffer(*bh);
 	if (!buffer_uptodate(*bh)) {
 		mlog_errno(-EIO);
diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index df69581..feff389 100644
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -872,7 +872,7 @@ loop_next:
 		 */
 		if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
 			spin_unlock(lock);
-			ll_rw_block(WRITE, 1, &bh);
+			ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
 			spin_lock(lock);
 		}
 		put_bh(bh);
@@ -1059,7 +1059,7 @@ static int flush_commit_list(struct super_block *s,
 		if (tbh) {
 			if (buffer_dirty(tbh)) {
 		            depth = reiserfs_write_unlock_nested(s);
-			    ll_rw_block(WRITE, 1, &tbh);
+			    ll_rw_block(REQ_OP_WRITE, 0, 1, &tbh);
 			    reiserfs_write_lock_nested(s, depth);
 			}
 			put_bh(tbh) ;
@@ -2248,7 +2248,7 @@ abort_replay:
 		}
 	}
 	/* read in the log blocks, memcpy to the corresponding real block */
-	ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
+	ll_rw_block(REQ_OP_READ, 0, get_desc_trans_len(desc), log_blocks);
 	for (i = 0; i < get_desc_trans_len(desc); i++) {
 
 		wait_on_buffer(log_blocks[i]);
@@ -2350,7 +2350,7 @@ static struct buffer_head *reiserfs_breada(struct block_device *dev,
 		} else
 			bhlist[j++] = bh;
 	}
-	ll_rw_block(READ, j, bhlist);
+	ll_rw_block(REQ_OP_READ, 0, j, bhlist);
 	for (i = 1; i < j; i++)
 		brelse(bhlist[i]);
 	bh = bhlist[0];
diff --git a/fs/reiserfs/stree.c b/fs/reiserfs/stree.c
index 24cbe01..e887401 100644
--- a/fs/reiserfs/stree.c
+++ b/fs/reiserfs/stree.c
@@ -551,7 +551,7 @@ static int search_by_key_reada(struct super_block *s,
 		if (!buffer_uptodate(bh[j])) {
 			if (depth == -1)
 				depth = reiserfs_write_unlock_nested(s);
-			ll_rw_block(READA, 1, bh + j);
+			ll_rw_block(REQ_OP_READ, REQ_RAHEAD, 1, bh + j);
 		}
 		brelse(bh[j]);
 	}
@@ -660,7 +660,7 @@ int search_by_key(struct super_block *sb, const struct cpu_key *key,
 			if (!buffer_uptodate(bh) && depth == -1)
 				depth = reiserfs_write_unlock_nested(sb);
 
-			ll_rw_block(READ, 1, &bh);
+			ll_rw_block(REQ_OP_READ, 0, 1, &bh);
 			wait_on_buffer(bh);
 
 			if (depth != -1)
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index 4a62fe8..68f5f5c 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -1659,7 +1659,7 @@ static int read_super_block(struct super_block *s, int offset)
 /* after journal replay, reread all bitmap and super blocks */
 static int reread_meta_blocks(struct super_block *s)
 {
-	ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s));
+	ll_rw_block(REQ_OP_READ, 0, 1, &SB_BUFFER_WITH_SB(s));
 	wait_on_buffer(SB_BUFFER_WITH_SB(s));
 	if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
 		reiserfs_warning(s, "reiserfs-2504", "error reading the super");
diff --git a/fs/squashfs/block.c b/fs/squashfs/block.c
index 0cea9b9..59375be 100644
--- a/fs/squashfs/block.c
+++ b/fs/squashfs/block.c
@@ -124,7 +124,7 @@ int squashfs_read_data(struct super_block *sb, u64 index, int length,
 				goto block_release;
 			bytes += msblk->devblksize;
 		}
-		ll_rw_block(READ, b, bh);
+		ll_rw_block(REQ_OP_READ, 0, b, bh);
 	} else {
 		/*
 		 * Metadata block.
@@ -156,7 +156,7 @@ int squashfs_read_data(struct super_block *sb, u64 index, int length,
 				goto block_release;
 			bytes += msblk->devblksize;
 		}
-		ll_rw_block(READ, b - 1, bh + 1);
+		ll_rw_block(REQ_OP_READ, 0, b - 1, bh + 1);
 	}
 
 	for (i = 0; i < b; i++) {
diff --git a/fs/udf/dir.c b/fs/udf/dir.c
index 541d9c6..1792fa0 100644
--- a/fs/udf/dir.c
+++ b/fs/udf/dir.c
@@ -113,7 +113,7 @@ static int udf_readdir(struct file *file, struct dir_context *ctx)
 					brelse(tmp);
 			}
 			if (num) {
-				ll_rw_block(READA, num, bha);
+				ll_rw_block(REQ_OP_READ, REQ_RAHEAD, num, bha);
 				for (i = 0; i < num; i++)
 					brelse(bha[i]);
 			}
diff --git a/fs/udf/directory.c b/fs/udf/directory.c
index c763fda..988d535 100644
--- a/fs/udf/directory.c
+++ b/fs/udf/directory.c
@@ -87,7 +87,7 @@ struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
 					brelse(tmp);
 			}
 			if (num) {
-				ll_rw_block(READA, num, bha);
+				ll_rw_block(REQ_OP_READ, REQ_RAHEAD, num, bha);
 				for (i = 0; i < num; i++)
 					brelse(bha[i]);
 			}
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 8d0b3ad..240c0cc 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1191,7 +1191,7 @@ struct buffer_head *udf_bread(struct inode *inode, int block,
 	if (buffer_uptodate(bh))
 		return bh;
 
-	ll_rw_block(READ, 1, &bh);
+	ll_rw_block(REQ_OP_READ, 0, 1, &bh);
 
 	wait_on_buffer(bh);
 	if (buffer_uptodate(bh))
diff --git a/fs/ufs/balloc.c b/fs/ufs/balloc.c
index dc5fae6..26a3bb1 100644
--- a/fs/ufs/balloc.c
+++ b/fs/ufs/balloc.c
@@ -292,7 +292,7 @@ static void ufs_change_blocknr(struct inode *inode, sector_t beg,
 			if (!buffer_mapped(bh))
 					map_bh(bh, inode->i_sb, oldb + pos);
 			if (!buffer_uptodate(bh)) {
-				ll_rw_block(READ, 1, &bh);
+				ll_rw_block(REQ_OP_READ, 0, 1, &bh);
 				wait_on_buffer(bh);
 				if (!buffer_uptodate(bh)) {
 					ufs_error(inode->i_sb, __func__,
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 6edc8dd..8505ee7 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -187,7 +187,7 @@ struct buffer_head *alloc_buffer_head(gfp_t gfp_flags);
 void free_buffer_head(struct buffer_head * bh);
 void unlock_buffer(struct buffer_head *bh);
 void __lock_buffer(struct buffer_head *bh);
-void ll_rw_block(int, int, struct buffer_head * bh[]);
+void ll_rw_block(int, int, int, struct buffer_head * bh[]);
 int sync_dirty_buffer(struct buffer_head *bh);
 int __sync_dirty_buffer(struct buffer_head *bh, int op, int op_flags);
 void write_dirty_buffer(struct buffer_head *bh, int op_flags);
-- 
1.8.3.1

[PATCH 24/32] dm: pass dm stats data dir instead of bi_rw

[mchristi]

From: Mike Christie <mchristi@redhat.com>

It looks like dm stats primarily cares about the data direction
(READ vs WRITE) and does not need the bio/request flags
and in the future operation value. REQ_DISCARD is always set with
REQ_WRITE, so the check for either one in dm_stats_account_io
is not needed.

This patch has it use the bio and request data_dir helpers
instead of accessing the bi_rw/cmd_flags directly. This makes
the next patches that remove the operation from the cmd_flags
and bi_rw cleaner since we do not have to check for multiple
operations.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 drivers/md/dm-stats.c | 6 +++---
 drivers/md/dm.c       | 8 ++++----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c
index 8289804..96b5c1b 100644
--- a/drivers/md/dm-stats.c
+++ b/drivers/md/dm-stats.c
@@ -518,7 +518,7 @@ static void dm_stat_for_entry(struct dm_stat *s, size_t entry,
 			      struct dm_stats_aux *stats_aux, bool end,
 			      unsigned long duration_jiffies)
 {
-	unsigned long idx = bi_rw & REQ_WRITE;
+	unsigned long idx = bi_rw;
 	struct dm_stat_shared *shared = &s->stat_shared[entry];
 	struct dm_stat_percpu *p;
 
@@ -645,8 +645,8 @@ void dm_stats_account_io(struct dm_stats *stats, unsigned long bi_rw,
 		last = raw_cpu_ptr(stats->last);
 		stats_aux->merged =
 			(bi_sector == (ACCESS_ONCE(last->last_sector) &&
-				       ((bi_rw & (REQ_WRITE | REQ_DISCARD)) ==
-					(ACCESS_ONCE(last->last_rw) & (REQ_WRITE | REQ_DISCARD)))
+				       ((bi_rw == WRITE) ==
+					(ACCESS_ONCE(last->last_rw) == WRITE))
 				       ));
 		ACCESS_ONCE(last->last_sector) = end_sector;
 		ACCESS_ONCE(last->last_rw) = bi_rw;
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index d2cf6d9..ea4bc70 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -655,7 +655,7 @@ static void start_io_acct(struct dm_io *io)
 		atomic_inc_return(&md->pending[rw]));
 
 	if (unlikely(dm_stats_used(&md->stats)))
-		dm_stats_account_io(&md->stats, bio->bi_rw, bio->bi_iter.bi_sector,
+		dm_stats_account_io(&md->stats, bio_data_dir(bio), bio->bi_iter.bi_sector,
 				    bio_sectors(bio), false, 0, &io->stats_aux);
 }
 
@@ -670,7 +670,7 @@ static void end_io_acct(struct dm_io *io)
 	generic_end_io_acct(rw, &dm_disk(md)->part0, io->start_time);
 
 	if (unlikely(dm_stats_used(&md->stats)))
-		dm_stats_account_io(&md->stats, bio->bi_rw, bio->bi_iter.bi_sector,
+		dm_stats_account_io(&md->stats, bio_data_dir(bio), bio->bi_iter.bi_sector,
 				    bio_sectors(bio), true, duration, &io->stats_aux);
 
 	/*
@@ -1053,7 +1053,7 @@ static void rq_end_stats(struct mapped_device *md, struct request *orig)
 	if (unlikely(dm_stats_used(&md->stats))) {
 		struct dm_rq_target_io *tio = tio_from_request(orig);
 		tio->duration_jiffies = jiffies - tio->duration_jiffies;
-		dm_stats_account_io(&md->stats, orig->cmd_flags, blk_rq_pos(orig),
+		dm_stats_account_io(&md->stats, rq_data_dir(orig), blk_rq_pos(orig),
 				    tio->n_sectors, true, tio->duration_jiffies,
 				    &tio->stats_aux);
 	}
@@ -1988,7 +1988,7 @@ static void dm_start_request(struct mapped_device *md, struct request *orig)
 		struct dm_rq_target_io *tio = tio_from_request(orig);
 		tio->duration_jiffies = jiffies;
 		tio->n_sectors = blk_rq_sectors(orig);
-		dm_stats_account_io(&md->stats, orig->cmd_flags, blk_rq_pos(orig),
+		dm_stats_account_io(&md->stats, rq_data_dir(orig), blk_rq_pos(orig),
 				    tio->n_sectors, false, 0, &tio->stats_aux);
 	}
 
-- 
1.8.3.1

[PATCH 25/32] block: add operation field to request struct

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patch adds field to the request to store the REQ_OP, and
has the block layer code set it up.

The next patches will modify the other drivers to get/test the
request->op field. We are still ORing the op into the cmd_flags.
When I am done with the conversion, that will be dropped.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 block/blk-core.c       | 50 ++++++++++++++++++++++++++++----------------------
 block/blk-flush.c      |  1 +
 block/blk-mq.c         | 31 +++++++++++++++++--------------
 include/linux/blkdev.h |  1 +
 4 files changed, 47 insertions(+), 36 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index c8672f2..e625516 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -984,7 +984,8 @@ static struct io_context *rq_ioc(struct bio *bio)
 /**
  * __get_request - get a free request
  * @rl: request list to allocate from
- * @rw_flags: RW and SYNC flags
+ * @op: REQ_OP
+ * @op_flags: rq_flag_bits
  * @bio: bio to allocate request for (can be %NULL)
  * @gfp_mask: allocation mask
  *
@@ -995,21 +996,22 @@ static struct io_context *rq_ioc(struct bio *bio)
  * Returns ERR_PTR on failure, with @q->queue_lock held.
  * Returns request pointer on success, with @q->queue_lock *not held*.
  */
-static struct request *__get_request(struct request_list *rl, int rw_flags,
-				     struct bio *bio, gfp_t gfp_mask)
+static struct request *__get_request(struct request_list *rl, int op,
+				     int op_flags, struct bio *bio,
+				     gfp_t gfp_mask)
 {
 	struct request_queue *q = rl->q;
 	struct request *rq;
 	struct elevator_type *et = q->elevator->type;
 	struct io_context *ioc = rq_ioc(bio);
 	struct io_cq *icq = NULL;
-	const bool is_sync = rw_is_sync(rw_flags) != 0;
+	const bool is_sync = rw_is_sync(op | op_flags) != 0;
 	int may_queue;
 
 	if (unlikely(blk_queue_dying(q)))
 		return ERR_PTR(-ENODEV);
 
-	may_queue = elv_may_queue(q, rw_flags);
+	may_queue = elv_may_queue(q, op | op_flags);
 	if (may_queue == ELV_MQUEUE_NO)
 		goto rq_starved;
 
@@ -1053,7 +1055,7 @@ static struct request *__get_request(struct request_list *rl, int rw_flags,
 
 	/*
 	 * Decide whether the new request will be managed by elevator.  If
-	 * so, mark @rw_flags and increment elvpriv.  Non-zero elvpriv will
+	 * so, mark @op_flags and increment elvpriv.  Non-zero elvpriv will
 	 * prevent the current elevator from being destroyed until the new
 	 * request is freed.  This guarantees icq's won't be destroyed and
 	 * makes creating new ones safe.
@@ -1062,14 +1064,14 @@ static struct request *__get_request(struct request_list *rl, int rw_flags,
 	 * it will be created after releasing queue_lock.
 	 */
 	if (blk_rq_should_init_elevator(bio) && !blk_queue_bypass(q)) {
-		rw_flags |= REQ_ELVPRIV;
+		op_flags |= REQ_ELVPRIV;
 		q->nr_rqs_elvpriv++;
 		if (et->icq_cache && ioc)
 			icq = ioc_lookup_icq(ioc, q);
 	}
 
 	if (blk_queue_io_stat(q))
-		rw_flags |= REQ_IO_STAT;
+		op_flags |= REQ_IO_STAT;
 	spin_unlock_irq(q->queue_lock);
 
 	/* allocate and init request */
@@ -1079,10 +1081,11 @@ static struct request *__get_request(struct request_list *rl, int rw_flags,
 
 	blk_rq_init(q, rq);
 	blk_rq_set_rl(rq, rl);
-	rq->cmd_flags = rw_flags | REQ_ALLOCED;
+	rq->cmd_flags = op | op_flags | REQ_ALLOCED;
+	rq->op = op;
 
 	/* init elvpriv */
-	if (rw_flags & REQ_ELVPRIV) {
+	if (op_flags & REQ_ELVPRIV) {
 		if (unlikely(et->icq_cache && !icq)) {
 			if (ioc)
 				icq = ioc_create_icq(ioc, q, gfp_mask);
@@ -1108,7 +1111,7 @@ out:
 	if (ioc_batching(q, ioc))
 		ioc->nr_batch_requests--;
 
-	trace_block_getrq(q, bio, rw_flags & 1);
+	trace_block_getrq(q, bio, op);
 	return rq;
 
 fail_elvpriv:
@@ -1138,7 +1141,7 @@ fail_alloc:
 	 * queue, but this is pretty rare.
 	 */
 	spin_lock_irq(q->queue_lock);
-	freed_request(rl, rw_flags);
+	freed_request(rl, op | op_flags);
 
 	/*
 	 * in the very unlikely event that allocation failed and no
@@ -1156,7 +1159,8 @@ rq_starved:
 /**
  * get_request - get a free request
  * @q: request_queue to allocate request from
- * @rw_flags: RW and SYNC flags
+ * op: REQ_OP
+ * @op_flags: rq_flag_bits
  * @bio: bio to allocate request for (can be %NULL)
  * @gfp_mask: allocation mask
  *
@@ -1167,17 +1171,18 @@ rq_starved:
  * Returns ERR_PTR on failure, with @q->queue_lock held.
  * Returns request pointer on success, with @q->queue_lock *not held*.
  */
-static struct request *get_request(struct request_queue *q, int rw_flags,
-				   struct bio *bio, gfp_t gfp_mask)
+static struct request *get_request(struct request_queue *q, int op,
+				   int op_flags, struct bio *bio,
+				   gfp_t gfp_mask)
 {
-	const bool is_sync = rw_is_sync(rw_flags) != 0;
+	const bool is_sync = rw_is_sync(op | op_flags) != 0;
 	DEFINE_WAIT(wait);
 	struct request_list *rl;
 	struct request *rq;
 
 	rl = blk_get_rl(q, bio);	/* transferred to @rq on success */
 retry:
-	rq = __get_request(rl, rw_flags, bio, gfp_mask);
+	rq = __get_request(rl, op, op_flags, bio, gfp_mask);
 	if (!IS_ERR(rq))
 		return rq;
 
@@ -1190,7 +1195,7 @@ retry:
 	prepare_to_wait_exclusive(&rl->wait[is_sync], &wait,
 				  TASK_UNINTERRUPTIBLE);
 
-	trace_block_sleeprq(q, bio, rw_flags & 1);
+	trace_block_sleeprq(q, bio, op);
 
 	spin_unlock_irq(q->queue_lock);
 	io_schedule();
@@ -1219,7 +1224,7 @@ static struct request *blk_old_get_request(struct request_queue *q, int rw,
 	create_io_context(gfp_mask, q->node);
 
 	spin_lock_irq(q->queue_lock);
-	rq = get_request(q, rw, NULL, gfp_mask);
+	rq = get_request(q, rw, 0, NULL, gfp_mask);
 	if (IS_ERR(rq))
 		spin_unlock_irq(q->queue_lock);
 	/* q->queue_lock is unlocked at this point */
@@ -1612,7 +1617,7 @@ static void blk_queue_bio(struct request_queue *q, struct bio *bio)
 {
 	const bool sync = !!(bio->bi_rw & REQ_SYNC);
 	struct blk_plug *plug;
-	int el_ret, rw_flags, where = ELEVATOR_INSERT_SORT;
+	int el_ret, rw_flags = 0, where = ELEVATOR_INSERT_SORT;
 	struct request *req;
 	unsigned int request_count = 0;
 
@@ -1670,7 +1675,6 @@ get_rq:
 	 * but we need to set it earlier to expose the sync flag to the
 	 * rq allocator and io schedulers.
 	 */
-	rw_flags = bio_data_dir(bio);
 	if (sync)
 		rw_flags |= REQ_SYNC;
 
@@ -1678,7 +1682,7 @@ get_rq:
 	 * Grab a free request. This is might sleep but can not fail.
 	 * Returns with the queue unlocked.
 	 */
-	req = get_request(q, rw_flags, bio, GFP_NOIO);
+	req = get_request(q, bio_data_dir(bio), rw_flags, bio, GFP_NOIO);
 	if (IS_ERR(req)) {
 		bio->bi_error = PTR_ERR(req);
 		bio_endio(bio);
@@ -2870,6 +2874,7 @@ void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
 {
 	/* Bit 0 (R/W) is identical in rq->cmd_flags and bio->bi_rw */
 	rq->cmd_flags |= bio->bi_rw & REQ_WRITE;
+	rq->op = bio->bi_op;
 
 	if (bio_has_data(bio))
 		rq->nr_phys_segments = bio_phys_segments(q, bio);
@@ -2954,6 +2959,7 @@ EXPORT_SYMBOL_GPL(blk_rq_unprep_clone);
 static void __blk_rq_prep_clone(struct request *dst, struct request *src)
 {
 	dst->cpu = src->cpu;
+	dst->op = src->op;
 	dst->cmd_flags |= (src->cmd_flags & REQ_CLONE_MASK) | REQ_NOMERGE;
 	dst->cmd_type = src->cmd_type;
 	dst->__sector = blk_rq_pos(src);
diff --git a/block/blk-flush.c b/block/blk-flush.c
index f707ba1..fc9c343 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -330,6 +330,7 @@ static bool blk_kick_flush(struct request_queue *q, struct blk_flush_queue *fq)
 
 	flush_rq->cmd_type = REQ_TYPE_FS;
 	flush_rq->cmd_flags = WRITE_FLUSH | REQ_FLUSH_SEQ;
+	flush_rq->op = REQ_OP_WRITE;
 	flush_rq->rq_disk = first_rq->rq_disk;
 	flush_rq->end_io = flush_end_io;
 
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 85f0143..d57a581 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -176,16 +176,18 @@ bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx)
 EXPORT_SYMBOL(blk_mq_can_queue);
 
 static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
-			       struct request *rq, unsigned int rw_flags)
+			       struct request *rq, int op,
+			       unsigned int op_flags)
 {
 	if (blk_queue_io_stat(q))
-		rw_flags |= REQ_IO_STAT;
+		op_flags |= REQ_IO_STAT;
 
 	INIT_LIST_HEAD(&rq->queuelist);
 	/* csd/requeue_work/fifo_time is initialized before use */
 	rq->q = q;
 	rq->mq_ctx = ctx;
-	rq->cmd_flags |= rw_flags;
+	rq->op = op;
+	rq->cmd_flags |= op | op_flags;
 	/* do not touch atomic flags, it needs atomic ops against the timer */
 	rq->cpu = -1;
 	INIT_HLIST_NODE(&rq->hash);
@@ -220,11 +222,11 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
 	rq->end_io_data = NULL;
 	rq->next_rq = NULL;
 
-	ctx->rq_dispatched[rw_is_sync(rw_flags)]++;
+	ctx->rq_dispatched[rw_is_sync(op | op_flags)]++;
 }
 
 static struct request *
-__blk_mq_alloc_request(struct blk_mq_alloc_data *data, int rw)
+__blk_mq_alloc_request(struct blk_mq_alloc_data *data, int op, int op_flags)
 {
 	struct request *rq;
 	unsigned int tag;
@@ -239,7 +241,7 @@ __blk_mq_alloc_request(struct blk_mq_alloc_data *data, int rw)
 		}
 
 		rq->tag = tag;
-		blk_mq_rq_ctx_init(data->q, data->ctx, rq, rw);
+		blk_mq_rq_ctx_init(data->q, data->ctx, rq, op, op_flags);
 		return rq;
 	}
 
@@ -264,7 +266,7 @@ struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp,
 	blk_mq_set_alloc_data(&alloc_data, q, gfp & ~__GFP_WAIT,
 			reserved, ctx, hctx);
 
-	rq = __blk_mq_alloc_request(&alloc_data, rw);
+	rq = __blk_mq_alloc_request(&alloc_data, rw, 0);
 	if (!rq && (gfp & __GFP_WAIT)) {
 		__blk_mq_run_hw_queue(hctx);
 		blk_mq_put_ctx(ctx);
@@ -273,7 +275,7 @@ struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp,
 		hctx = q->mq_ops->map_queue(q, ctx->cpu);
 		blk_mq_set_alloc_data(&alloc_data, q, gfp, reserved, ctx,
 				hctx);
-		rq =  __blk_mq_alloc_request(&alloc_data, rw);
+		rq =  __blk_mq_alloc_request(&alloc_data, rw, 0);
 		ctx = alloc_data.ctx;
 	}
 	blk_mq_put_ctx(ctx);
@@ -1173,7 +1175,8 @@ static struct request *blk_mq_map_request(struct request_queue *q,
 	struct blk_mq_hw_ctx *hctx;
 	struct blk_mq_ctx *ctx;
 	struct request *rq;
-	int rw = bio_data_dir(bio);
+	int op = bio_data_dir(bio);
+	int op_flags = 0;
 	struct blk_mq_alloc_data alloc_data;
 
 	if (unlikely(blk_mq_queue_enter(q, GFP_KERNEL))) {
@@ -1185,22 +1188,22 @@ static struct request *blk_mq_map_request(struct request_queue *q,
 	hctx = q->mq_ops->map_queue(q, ctx->cpu);
 
 	if (rw_is_sync(bio->bi_rw))
-		rw |= REQ_SYNC;
+		op_flags |= REQ_SYNC;
 
-	trace_block_getrq(q, bio, rw);
+	trace_block_getrq(q, bio, op);
 	blk_mq_set_alloc_data(&alloc_data, q, GFP_ATOMIC, false, ctx,
 			hctx);
-	rq = __blk_mq_alloc_request(&alloc_data, rw);
+	rq = __blk_mq_alloc_request(&alloc_data, op, op_flags);
 	if (unlikely(!rq)) {
 		__blk_mq_run_hw_queue(hctx);
 		blk_mq_put_ctx(ctx);
-		trace_block_sleeprq(q, bio, rw);
+		trace_block_sleeprq(q, bio, op);
 
 		ctx = blk_mq_get_ctx(q);
 		hctx = q->mq_ops->map_queue(q, ctx->cpu);
 		blk_mq_set_alloc_data(&alloc_data, q,
 				__GFP_WAIT|GFP_ATOMIC, false, ctx, hctx);
-		rq = __blk_mq_alloc_request(&alloc_data, rw);
+		rq = __blk_mq_alloc_request(&alloc_data, op, op_flags);
 		ctx = alloc_data.ctx;
 		hctx = alloc_data.hctx;
 	}
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index cf5f518..9c5bee9 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -94,6 +94,7 @@ struct request {
 	struct request_queue *q;
 	struct blk_mq_ctx *mq_ctx;
 
+	int op;
 	u64 cmd_flags;
 	unsigned cmd_type;
 	unsigned long atomic_flags;
-- 
1.8.3.1

[PATCH 26/32] ide cd: do not set REQ_WRITE on requests.

[mchristi]

From: Mike Christie <mchristi@redhat.com>

The block layer will set the correct READ/WRITE operation flags/fields
when creating a request, so there is not need for drivers to set the
REQ_WRITE flag.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 drivers/ide/ide-cd_ioctl.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/ide/ide-cd_ioctl.c b/drivers/ide/ide-cd_ioctl.c
index 066e390..d2d0b38 100644
--- a/drivers/ide/ide-cd_ioctl.c
+++ b/drivers/ide/ide-cd_ioctl.c
@@ -459,9 +459,6 @@ int ide_cdrom_packet(struct cdrom_device_info *cdi,
 	   layer. the packet must be complete, as we do not
 	   touch it at all. */
 
-	if (cgc->data_direction == CGC_DATA_WRITE)
-		flags |= REQ_WRITE;
-
 	if (cgc->sense)
 		memset(cgc->sense, 0, sizeof(struct request_sense));
 
-- 
1.8.3.1

[PATCH 27/32] cfq/cgroup: pass operation and flags seperately

[mchristi]

From: Mike Christie <mchristi@redhat.com>

The operation is about to be separated from the flags, so this
patch has users pass them in separately to the cgroup stats.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 block/cfq-iosched.c        | 49 +++++++++++++++++++++++++++-------------------
 include/linux/blk-cgroup.h | 13 ++++++------
 2 files changed, 36 insertions(+), 26 deletions(-)

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 04de884..dbc3da4 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -660,9 +660,10 @@ static inline void cfqg_put(struct cfq_group *cfqg)
 } while (0)
 
 static inline void cfqg_stats_update_io_add(struct cfq_group *cfqg,
-					    struct cfq_group *curr_cfqg, int rw)
+					    struct cfq_group *curr_cfqg, int op,
+					    int op_flags)
 {
-	blkg_rwstat_add(&cfqg->stats.queued, rw, 1);
+	blkg_rwstat_add(&cfqg->stats.queued, op, op_flags, 1);
 	cfqg_stats_end_empty_time(&cfqg->stats);
 	cfqg_stats_set_start_group_wait_time(cfqg, curr_cfqg);
 }
@@ -676,26 +677,30 @@ static inline void cfqg_stats_update_timeslice_used(struct cfq_group *cfqg,
 #endif
 }
 
-static inline void cfqg_stats_update_io_remove(struct cfq_group *cfqg, int rw)
+static inline void cfqg_stats_update_io_remove(struct cfq_group *cfqg, int op,
+					       int op_flags)
 {
-	blkg_rwstat_add(&cfqg->stats.queued, rw, -1);
+	blkg_rwstat_add(&cfqg->stats.queued, op, op_flags, -1);
 }
 
-static inline void cfqg_stats_update_io_merged(struct cfq_group *cfqg, int rw)
+static inline void cfqg_stats_update_io_merged(struct cfq_group *cfqg, int op,
+					       int op_flags)
 {
-	blkg_rwstat_add(&cfqg->stats.merged, rw, 1);
+	blkg_rwstat_add(&cfqg->stats.merged, op, op_flags, 1);
 }
 
 static inline void cfqg_stats_update_completion(struct cfq_group *cfqg,
-			uint64_t start_time, uint64_t io_start_time, int rw)
+			uint64_t start_time, uint64_t io_start_time, int op,
+			int op_flags)
 {
 	struct cfqg_stats *stats = &cfqg->stats;
 	unsigned long long now = sched_clock();
 
 	if (time_after64(now, io_start_time))
-		blkg_rwstat_add(&stats->service_time, rw, now - io_start_time);
+		blkg_rwstat_add(&stats->service_time, op, op_flags,
+				now - io_start_time);
 	if (time_after64(io_start_time, start_time))
-		blkg_rwstat_add(&stats->wait_time, rw,
+		blkg_rwstat_add(&stats->wait_time, op, op_flags,
 				io_start_time - start_time);
 }
 
@@ -769,13 +774,16 @@ static inline void cfqg_put(struct cfq_group *cfqg) { }
 #define cfq_log_cfqg(cfqd, cfqg, fmt, args...)		do {} while (0)
 
 static inline void cfqg_stats_update_io_add(struct cfq_group *cfqg,
-			struct cfq_group *curr_cfqg, int rw) { }
+			struct cfq_group *curr_cfqg, int op, int op_flags) { }
 static inline void cfqg_stats_update_timeslice_used(struct cfq_group *cfqg,
 			unsigned long time, unsigned long unaccounted_time) { }
-static inline void cfqg_stats_update_io_remove(struct cfq_group *cfqg, int rw) { }
-static inline void cfqg_stats_update_io_merged(struct cfq_group *cfqg, int rw) { }
+static inline void cfqg_stats_update_io_remove(struct cfq_group *cfqg, int op,
+			int op_flags) { }
+static inline void cfqg_stats_update_io_merged(struct cfq_group *cfqg, int op,
+			int op_flags) { }
 static inline void cfqg_stats_update_completion(struct cfq_group *cfqg,
-			uint64_t start_time, uint64_t io_start_time, int rw) { }
+			uint64_t start_time, uint64_t io_start_time, int op,
+			int op_flags) { }
 
 #endif	/* CONFIG_CFQ_GROUP_IOSCHED */
 
@@ -2449,10 +2457,10 @@ static void cfq_reposition_rq_rb(struct cfq_queue *cfqq, struct request *rq)
 {
 	elv_rb_del(&cfqq->sort_list, rq);
 	cfqq->queued[rq_is_sync(rq)]--;
-	cfqg_stats_update_io_remove(RQ_CFQG(rq), rq->cmd_flags);
+	cfqg_stats_update_io_remove(RQ_CFQG(rq), rq->op, rq->cmd_flags);
 	cfq_add_rq_rb(rq);
 	cfqg_stats_update_io_add(RQ_CFQG(rq), cfqq->cfqd->serving_group,
-				 rq->cmd_flags);
+				 rq->op, rq->cmd_flags);
 }
 
 static struct request *
@@ -2505,7 +2513,7 @@ static void cfq_remove_request(struct request *rq)
 	cfq_del_rq_rb(rq);
 
 	cfqq->cfqd->rq_queued--;
-	cfqg_stats_update_io_remove(RQ_CFQG(rq), rq->cmd_flags);
+	cfqg_stats_update_io_remove(RQ_CFQG(rq), rq->op, rq->cmd_flags);
 	if (rq->cmd_flags & REQ_PRIO) {
 		WARN_ON(!cfqq->prio_pending);
 		cfqq->prio_pending--;
@@ -2540,7 +2548,7 @@ static void cfq_merged_request(struct request_queue *q, struct request *req,
 static void cfq_bio_merged(struct request_queue *q, struct request *req,
 				struct bio *bio)
 {
-	cfqg_stats_update_io_merged(RQ_CFQG(req), bio->bi_rw);
+	cfqg_stats_update_io_merged(RQ_CFQG(req), bio->bi_op, bio->bi_rw);
 }
 
 static void
@@ -2563,7 +2571,7 @@ cfq_merged_requests(struct request_queue *q, struct request *rq,
 	if (cfqq->next_rq == next)
 		cfqq->next_rq = rq;
 	cfq_remove_request(next);
-	cfqg_stats_update_io_merged(RQ_CFQG(rq), next->cmd_flags);
+	cfqg_stats_update_io_merged(RQ_CFQG(rq), next->op, next->cmd_flags);
 
 	cfqq = RQ_CFQQ(next);
 	/*
@@ -4085,7 +4093,7 @@ static void cfq_insert_request(struct request_queue *q, struct request *rq)
 	rq->fifo_time = jiffies + cfqd->cfq_fifo_expire[rq_is_sync(rq)];
 	list_add_tail(&rq->queuelist, &cfqq->fifo);
 	cfq_add_rq_rb(rq);
-	cfqg_stats_update_io_add(RQ_CFQG(rq), cfqd->serving_group,
+	cfqg_stats_update_io_add(RQ_CFQG(rq), cfqd->serving_group, rq->op,
 				 rq->cmd_flags);
 	cfq_rq_enqueued(cfqd, cfqq, rq);
 }
@@ -4183,7 +4191,8 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
 	cfqq->dispatched--;
 	(RQ_CFQG(rq))->dispatched--;
 	cfqg_stats_update_completion(cfqq->cfqg, rq_start_time_ns(rq),
-				     rq_io_start_time_ns(rq), rq->cmd_flags);
+				     rq_io_start_time_ns(rq), rq->op,
+				     rq->cmd_flags);
 
 	cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]--;
 
diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index c02e669..0b230b9 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -590,25 +590,26 @@ static inline void blkg_rwstat_exit(struct blkg_rwstat *rwstat)
 /**
  * blkg_rwstat_add - add a value to a blkg_rwstat
  * @rwstat: target blkg_rwstat
- * @rw: mask of REQ_{WRITE|SYNC}
+ * @op: REQ_OP
+ * @op_flags: rq_flag_bits
  * @val: value to add
  *
  * Add @val to @rwstat.  The counters are chosen according to @rw.  The
  * caller is responsible for synchronizing calls to this function.
  */
 static inline void blkg_rwstat_add(struct blkg_rwstat *rwstat,
-				   int rw, uint64_t val)
+				   int op, int op_flags, uint64_t val)
 {
 	struct percpu_counter *cnt;
 
-	if (rw & REQ_WRITE)
+	if (op_to_data_dir(op))
 		cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_WRITE];
 	else
 		cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_READ];
 
 	__percpu_counter_add(cnt, val, BLKG_STAT_CPU_BATCH);
 
-	if (rw & REQ_SYNC)
+	if (op_flags & REQ_SYNC)
 		cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_SYNC];
 	else
 		cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_ASYNC];
@@ -713,9 +714,9 @@ static inline bool blkcg_bio_issue_check(struct request_queue *q,
 
 	if (!throtl) {
 		blkg = blkg ?: q->root_blkg;
-		blkg_rwstat_add(&blkg->stat_bytes, bio->bi_rw,
+		blkg_rwstat_add(&blkg->stat_bytes, bio->bi_op, bio->bi_rw,
 				bio->bi_iter.bi_size);
-		blkg_rwstat_add(&blkg->stat_ios, bio->bi_rw, 1);
+		blkg_rwstat_add(&blkg->stat_ios, bio->bi_op, bio->bi_rw, 1);
 	}
 
 	rcu_read_unlock();
-- 
1.8.3.1

[PATCH 28/32] block/fs/drivers: use bio/rq_data_dir helpers

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This has the the block layer, drivers and fs code use
the bio and rq data_dir helpers instead of accessing the
bi_rw/cmd_flags and checking for REQ_WRITE.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 block/blk-merge.c                | 2 +-
 drivers/ata/libata-scsi.c        | 2 +-
 drivers/block/loop.c             | 6 +++---
 drivers/block/rbd.c              | 2 +-
 drivers/block/umem.c             | 2 +-
 drivers/ide/ide-floppy.c         | 2 +-
 drivers/md/bcache/io.c           | 2 +-
 drivers/md/bcache/request.c      | 6 +++---
 drivers/scsi/osd/osd_initiator.c | 4 ++--
 fs/btrfs/disk-io.c               | 2 +-
 fs/btrfs/extent_io.c             | 2 +-
 fs/btrfs/inode.c                 | 2 +-
 include/linux/blkdev.h           | 2 +-
 include/linux/fs.h               | 2 +-
 14 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/block/blk-merge.c b/block/blk-merge.c
index c4e9c37..fe00d94 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -378,7 +378,7 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq,
 	}
 
 	if (q->dma_drain_size && q->dma_drain_needed(rq)) {
-		if (rq->cmd_flags & REQ_WRITE)
+		if (rq_data_dir(rq) == WRITE)
 			memset(q->dma_drain_buffer, 0, q->dma_drain_size);
 
 		sg_unmark_end(sg);
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 0d7f0da..68c2b34 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1125,7 +1125,7 @@ static int atapi_drain_needed(struct request *rq)
 	if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
 		return 0;
 
-	if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE))
+	if (!blk_rq_bytes(rq) || rq_data_dir(rq) == WRITE)
 		return 0;
 
 	return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 674f800..e214936 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -396,7 +396,7 @@ static int do_req_filebacked(struct loop_device *lo, struct request *rq)
 
 	pos = ((loff_t) blk_rq_pos(rq) << 9) + lo->lo_offset;
 
-	if (rq->cmd_flags & REQ_WRITE) {
+	if (rq_data_dir(rq) == WRITE) {
 		if (rq->cmd_flags & REQ_FLUSH)
 			ret = lo_req_flush(lo, rq);
 		else if (rq->cmd_flags & REQ_DISCARD)
@@ -1461,7 +1461,7 @@ static int loop_queue_rq(struct blk_mq_hw_ctx *hctx,
 	if (lo->lo_state != Lo_bound)
 		return -EIO;
 
-	if (cmd->rq->cmd_flags & REQ_WRITE) {
+	if (rq_data_dir(cmd->rq) == WRITE) {
 		struct loop_device *lo = cmd->rq->q->queuedata;
 		bool need_sched = true;
 
@@ -1484,7 +1484,7 @@ static int loop_queue_rq(struct blk_mq_hw_ctx *hctx,
 
 static void loop_handle_cmd(struct loop_cmd *cmd)
 {
-	const bool write = cmd->rq->cmd_flags & REQ_WRITE;
+	const bool write = rq_data_dir(cmd->rq);
 	struct loop_device *lo = cmd->rq->q->queuedata;
 	int ret = 0;
 
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 6f26cf3..39104ca 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -3377,7 +3377,7 @@ static void rbd_queue_workfn(struct work_struct *work)
 
 	if (rq->cmd_flags & REQ_DISCARD)
 		op_type = OBJ_OP_DISCARD;
-	else if (rq->cmd_flags & REQ_WRITE)
+	else if (rq_data_dir(rq) == WRITE)
 		op_type = OBJ_OP_WRITE;
 	else
 		op_type = OBJ_OP_READ;
diff --git a/drivers/block/umem.c b/drivers/block/umem.c
index 04d6579..2355754 100644
--- a/drivers/block/umem.c
+++ b/drivers/block/umem.c
@@ -462,7 +462,7 @@ static void process_page(unsigned long data)
 				le32_to_cpu(desc->local_addr)>>9,
 				le32_to_cpu(desc->transfer_size));
 			dump_dmastat(card, control);
-		} else if ((bio->bi_rw & REQ_WRITE) &&
+		} else if (bio_data_dir(bio) == WRITE &&
 			   le32_to_cpu(desc->local_addr) >> 9 ==
 				card->init_size) {
 			card->init_size += le32_to_cpu(desc->transfer_size) >> 9;
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 2fb5350..f079d8d 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -206,7 +206,7 @@ static void idefloppy_create_rw_cmd(ide_drive_t *drive,
 	memcpy(rq->cmd, pc->c, 12);
 
 	pc->rq = rq;
-	if (rq->cmd_flags & REQ_WRITE)
+	if (cmd == WRITE)
 		pc->flags |= PC_FLAG_WRITING;
 
 	pc->flags |= PC_FLAG_DMA_OK;
diff --git a/drivers/md/bcache/io.c b/drivers/md/bcache/io.c
index 86a0bb8..fbc8974 100644
--- a/drivers/md/bcache/io.c
+++ b/drivers/md/bcache/io.c
@@ -111,7 +111,7 @@ void bch_bbio_count_io_errors(struct cache_set *c, struct bio *bio,
 	struct bbio *b = container_of(bio, struct bbio, bio);
 	struct cache *ca = PTR_CACHE(c, &b->key, 0);
 
-	unsigned threshold = bio->bi_rw & REQ_WRITE
+	unsigned threshold = bio_data_dir(bio) == WRITE
 		? c->congested_write_threshold_us
 		: c->congested_read_threshold_us;
 
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 7a84f3b..11f6b5c 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -384,7 +384,7 @@ static bool check_should_bypass(struct cached_dev *dc, struct bio *bio)
 
 	if (mode == CACHE_MODE_NONE ||
 	    (mode == CACHE_MODE_WRITEAROUND &&
-	     (bio->bi_rw & REQ_WRITE)))
+	     bio_data_dir(bio) == WRITE))
 		goto skip;
 
 	if (bio->bi_iter.bi_sector & (c->sb.block_size - 1) ||
@@ -405,7 +405,7 @@ static bool check_should_bypass(struct cached_dev *dc, struct bio *bio)
 
 	if (!congested &&
 	    mode == CACHE_MODE_WRITEBACK &&
-	    (bio->bi_rw & REQ_WRITE) &&
+	    bio_data_dir(bio) == WRITE &&
 	    (bio->bi_rw & REQ_SYNC))
 		goto rescale;
 
@@ -658,7 +658,7 @@ static inline struct search *search_alloc(struct bio *bio,
 	s->cache_miss		= NULL;
 	s->d			= d;
 	s->recoverable		= 1;
-	s->write		= (bio->bi_rw & REQ_WRITE) != 0;
+	s->write		= bio_data_dir(bio) == WRITE;
 	s->read_dirty_data	= 0;
 	s->start_time		= jiffies;
 
diff --git a/drivers/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
index ca7b4b6..650ba1c 100644
--- a/drivers/scsi/osd/osd_initiator.c
+++ b/drivers/scsi/osd/osd_initiator.c
@@ -828,7 +828,7 @@ void osd_req_write(struct osd_request *or,
 {
 	_osd_req_encode_common(or, OSD_ACT_WRITE, obj, offset, len);
 	WARN_ON(or->out.bio || or->out.total_bytes);
-	WARN_ON(0 == (bio->bi_rw & REQ_WRITE));
+	WARN_ON(bio_data_dir(bio) == READ);
 	or->out.bio = bio;
 	or->out.total_bytes = len;
 }
@@ -880,7 +880,7 @@ void osd_req_read(struct osd_request *or,
 {
 	_osd_req_encode_common(or, OSD_ACT_READ, obj, offset, len);
 	WARN_ON(or->in.bio || or->in.total_bytes);
-	WARN_ON(bio->bi_rw & REQ_WRITE);
+	WARN_ON(bio_data_dir(bio) == WRITE);
 	or->in.bio = bio;
 	or->in.total_bytes = len;
 }
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index f1262e6..8771f31 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -714,7 +714,7 @@ static void end_workqueue_bio(struct bio *bio)
 	fs_info = end_io_wq->info;
 	end_io_wq->error = bio->bi_error;
 
-	if (bio->bi_rw & REQ_WRITE) {
+	if (bio_data_dir(bio) == WRITE) {
 		if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA) {
 			wq = fs_info->endio_meta_write_workers;
 			func = btrfs_endio_meta_write_helper;
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 0dc9ec6..1075b05 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2410,7 +2410,7 @@ static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset,
 	int read_mode_flags = READ_SYNC;
 	int ret;
 
-	BUG_ON(failed_bio->bi_rw & REQ_WRITE);
+	BUG_ON(bio_data_dir(failed_bio) == WRITE);
 
 	ret = btrfs_get_io_failure_record(inode, start, end, &failrec);
 	if (ret)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index dd0b769..3ffb969 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7675,7 +7675,7 @@ static int dio_read_error(struct inode *inode, struct bio *failed_bio,
 	int read_mode;
 	int ret;
 
-	BUG_ON(failed_bio->bi_rw & REQ_WRITE);
+	BUG_ON(bio_data_dir(failed_bio) == WRITE);
 
 	ret = btrfs_get_io_failure_record(inode, start, end, &failrec);
 	if (ret)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 9c5bee9..4376ec6 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -599,7 +599,7 @@ static inline int op_to_data_dir(int op)
 		return WRITE;
 }
 
-#define rq_data_dir(rq)		((int)((rq)->cmd_flags & 1))
+#define rq_data_dir(rq)		(rq->op == REQ_OP_READ ? READ : WRITE)
 
 /*
  * Driver can handle struct request, if it either has an old style
diff --git a/include/linux/fs.h b/include/linux/fs.h
index ac1fd9b..66dd4b91 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2397,7 +2397,7 @@ extern int is_bad_inode(struct inode *);
 /*
  * return data direction, READ or WRITE
  */
-#define bio_data_dir(bio)	((bio)->bi_rw & 1)
+#define bio_data_dir(bio)	((bio)->bi_op == REQ_OP_READ ? READ : WRITE)
 
 extern void check_disk_size_change(struct gendisk *disk,
 				   struct block_device *bdev);
-- 
1.8.3.1

[PATCH 29/32] block/drivers: rm request cmd_flags REQ_OP use

[mchristi]

From: Mike Christie <mchristi@redhat.com>

With this patch the request struct code no longer uses the
cmd_flags field for REQ_OP operations.

---
 block/blk-core.c                  | 17 +++++++++--------
 block/blk-merge.c                 | 10 ++++++----
 block/blk-mq.c                    | 10 +++++-----
 block/cfq-iosched.c               |  4 ++--
 block/elevator.c                  |  8 ++++----
 drivers/block/loop.c              |  2 +-
 drivers/block/mtip32xx/mtip32xx.c |  2 +-
 drivers/block/nbd.c               |  2 +-
 drivers/block/nvme-core.c         |  6 +++---
 drivers/block/rbd.c               |  2 +-
 drivers/block/skd_main.c          | 11 ++++-------
 drivers/block/xen-blkfront.c      |  8 +++++---
 drivers/md/dm.c                   |  2 +-
 drivers/mmc/card/block.c          |  7 +++----
 drivers/mmc/card/queue.c          |  6 ++----
 drivers/mmc/card/queue.h          |  5 ++++-
 drivers/mtd/mtd_blkdevs.c         |  2 +-
 drivers/scsi/sd.c                 | 22 ++++++++++++++--------
 include/linux/blkdev.h            | 26 +++++++++++++-------------
 include/linux/elevator.h          |  4 ++--
 20 files changed, 82 insertions(+), 74 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index e625516..deb8bfd 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -889,10 +889,10 @@ static void __freed_request(struct request_list *rl, int sync)
  * A request has just been released.  Account for it, update the full and
  * congestion status, wake up any waiters.   Called under q->queue_lock.
  */
-static void freed_request(struct request_list *rl, unsigned int flags)
+static void freed_request(struct request_list *rl, int op, unsigned int flags)
 {
 	struct request_queue *q = rl->q;
-	int sync = rw_is_sync(flags);
+	int sync = rw_is_sync(op, flags);
 
 	q->nr_rqs[sync]--;
 	rl->count[sync]--;
@@ -1005,13 +1005,13 @@ static struct request *__get_request(struct request_list *rl, int op,
 	struct elevator_type *et = q->elevator->type;
 	struct io_context *ioc = rq_ioc(bio);
 	struct io_cq *icq = NULL;
-	const bool is_sync = rw_is_sync(op | op_flags) != 0;
+	const bool is_sync = rw_is_sync(op, op_flags) != 0;
 	int may_queue;
 
 	if (unlikely(blk_queue_dying(q)))
 		return ERR_PTR(-ENODEV);
 
-	may_queue = elv_may_queue(q, op | op_flags);
+	may_queue = elv_may_queue(q, op, op_flags);
 	if (may_queue == ELV_MQUEUE_NO)
 		goto rq_starved;
 
@@ -1141,7 +1141,7 @@ fail_alloc:
 	 * queue, but this is pretty rare.
 	 */
 	spin_lock_irq(q->queue_lock);
-	freed_request(rl, op | op_flags);
+	freed_request(rl, op, op_flags);
 
 	/*
 	 * in the very unlikely event that allocation failed and no
@@ -1175,7 +1175,7 @@ static struct request *get_request(struct request_queue *q, int op,
 				   int op_flags, struct bio *bio,
 				   gfp_t gfp_mask)
 {
-	const bool is_sync = rw_is_sync(op | op_flags) != 0;
+	const bool is_sync = rw_is_sync(op, op_flags) != 0;
 	DEFINE_WAIT(wait);
 	struct request_list *rl;
 	struct request *rq;
@@ -1424,13 +1424,14 @@ void __blk_put_request(struct request_queue *q, struct request *req)
 	 */
 	if (req->cmd_flags & REQ_ALLOCED) {
 		unsigned int flags = req->cmd_flags;
+		int op = req->op;
 		struct request_list *rl = blk_rq_rl(req);
 
 		BUG_ON(!list_empty(&req->queuelist));
 		BUG_ON(ELV_ON_HASH(req));
 
 		blk_free_request(rl, req);
-		freed_request(rl, flags);
+		freed_request(rl, op, flags);
 		blk_put_rl(rl);
 	}
 }
@@ -2054,7 +2055,7 @@ int blk_rq_check_limits(struct request_queue *q, struct request *rq)
 	if (!rq_mergeable(rq))
 		return 0;
 
-	if (blk_rq_sectors(rq) > blk_queue_get_max_sectors(q, rq->cmd_flags)) {
+	if (blk_rq_sectors(rq) > blk_queue_get_max_sectors(q, rq->op)) {
 		printk(KERN_ERR "%s: over max size limit.\n", __func__);
 		return -EIO;
 	}
diff --git a/block/blk-merge.c b/block/blk-merge.c
index fe00d94..ec42c7e 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -582,7 +582,8 @@ static int attempt_merge(struct request_queue *q, struct request *req,
 	if (!rq_mergeable(req) || !rq_mergeable(next))
 		return 0;
 
-	if (!blk_check_merge_flags(req->cmd_flags, next->cmd_flags))
+	if (!blk_check_merge_flags(req->cmd_flags, req->op, next->cmd_flags,
+				   next->op))
 		return 0;
 
 	/*
@@ -596,7 +597,7 @@ static int attempt_merge(struct request_queue *q, struct request *req,
 	    || req_no_special_merge(next))
 		return 0;
 
-	if (req->cmd_flags & REQ_WRITE_SAME &&
+	if (req->op == REQ_OP_WRITE_SAME &&
 	    !blk_write_same_mergeable(req->bio, next->bio))
 		return 0;
 
@@ -684,7 +685,8 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
 	if (!rq_mergeable(rq) || !bio_mergeable(bio))
 		return false;
 
-	if (!blk_check_merge_flags(rq->cmd_flags, bio->bi_rw))
+	if (!blk_check_merge_flags(rq->cmd_flags, rq->op, bio->bi_rw,
+				   bio->bi_op))
 		return false;
 
 	/* different data direction or already started, don't merge */
@@ -700,7 +702,7 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
 		return false;
 
 	/* must be using the same buffer */
-	if (rq->cmd_flags & REQ_WRITE_SAME &&
+	if (rq->op == REQ_OP_WRITE_SAME &&
 	    !blk_write_same_mergeable(rq->bio, bio))
 		return false;
 
diff --git a/block/blk-mq.c b/block/blk-mq.c
index d57a581..b7352ad 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -187,7 +187,7 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
 	rq->q = q;
 	rq->mq_ctx = ctx;
 	rq->op = op;
-	rq->cmd_flags |= op | op_flags;
+	rq->cmd_flags |= op_flags;
 	/* do not touch atomic flags, it needs atomic ops against the timer */
 	rq->cpu = -1;
 	INIT_HLIST_NODE(&rq->hash);
@@ -222,7 +222,7 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
 	rq->end_io_data = NULL;
 	rq->next_rq = NULL;
 
-	ctx->rq_dispatched[rw_is_sync(op | op_flags)]++;
+	ctx->rq_dispatched[rw_is_sync(op, op_flags)]++;
 }
 
 static struct request *
@@ -1187,7 +1187,7 @@ static struct request *blk_mq_map_request(struct request_queue *q,
 	ctx = blk_mq_get_ctx(q);
 	hctx = q->mq_ops->map_queue(q, ctx->cpu);
 
-	if (rw_is_sync(bio->bi_rw))
+	if (rw_is_sync(bio->bi_op, bio->bi_rw))
 		op_flags |= REQ_SYNC;
 
 	trace_block_getrq(q, bio, op);
@@ -1253,7 +1253,7 @@ static int blk_mq_direct_issue_request(struct request *rq)
  */
 static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
 {
-	const int is_sync = rw_is_sync(bio->bi_rw);
+	const int is_sync = rw_is_sync(bio->bi_op, bio->bi_rw);
 	const int is_flush_fua = bio->bi_rw & (REQ_FLUSH | REQ_FUA);
 	struct blk_map_ctx data;
 	struct request *rq;
@@ -1341,7 +1341,7 @@ run_queue:
  */
 static void blk_sq_make_request(struct request_queue *q, struct bio *bio)
 {
-	const int is_sync = rw_is_sync(bio->bi_rw);
+	const int is_sync = rw_is_sync(bio->bi_op, bio->bi_rw);
 	const int is_flush_fua = bio->bi_rw & (REQ_FLUSH | REQ_FUA);
 	struct blk_plug *plug;
 	unsigned int request_count = 0;
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index dbc3da4..fc964e1 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -4271,7 +4271,7 @@ static inline int __cfq_may_queue(struct cfq_queue *cfqq)
 	return ELV_MQUEUE_MAY;
 }
 
-static int cfq_may_queue(struct request_queue *q, int rw)
+static int cfq_may_queue(struct request_queue *q, int op, int op_flags)
 {
 	struct cfq_data *cfqd = q->elevator->elevator_data;
 	struct task_struct *tsk = current;
@@ -4288,7 +4288,7 @@ static int cfq_may_queue(struct request_queue *q, int rw)
 	if (!cic)
 		return ELV_MQUEUE_MAY;
 
-	cfqq = cic_to_cfqq(cic, rw_is_sync(rw));
+	cfqq = cic_to_cfqq(cic, rw_is_sync(op, op_flags));
 	if (cfqq) {
 		cfq_init_prio_data(cfqq, cic);
 
diff --git a/block/elevator.c b/block/elevator.c
index 84d6394..1624d48 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -366,8 +366,8 @@ void elv_dispatch_sort(struct request_queue *q, struct request *rq)
 	list_for_each_prev(entry, &q->queue_head) {
 		struct request *pos = list_entry_rq(entry);
 
-		if ((rq->cmd_flags & REQ_DISCARD) !=
-		    (pos->cmd_flags & REQ_DISCARD))
+		if ((rq->op == REQ_OP_DISCARD) !=
+		    (pos->op == REQ_OP_DISCARD))
 			break;
 		if (rq_data_dir(rq) != rq_data_dir(pos))
 			break;
@@ -717,12 +717,12 @@ void elv_put_request(struct request_queue *q, struct request *rq)
 		e->type->ops.elevator_put_req_fn(rq);
 }
 
-int elv_may_queue(struct request_queue *q, int rw)
+int elv_may_queue(struct request_queue *q, int op, int op_flags)
 {
 	struct elevator_queue *e = q->elevator;
 
 	if (e->type->ops.elevator_may_queue_fn)
-		return e->type->ops.elevator_may_queue_fn(q, rw);
+		return e->type->ops.elevator_may_queue_fn(q, op, op_flags);
 
 	return ELV_MQUEUE_MAY;
 }
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index e214936..bddffed 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -399,7 +399,7 @@ static int do_req_filebacked(struct loop_device *lo, struct request *rq)
 	if (rq_data_dir(rq) == WRITE) {
 		if (rq->cmd_flags & REQ_FLUSH)
 			ret = lo_req_flush(lo, rq);
-		else if (rq->cmd_flags & REQ_DISCARD)
+		else if (rq->op == REQ_OP_DISCARD)
 			ret = lo_discard(lo, rq, pos);
 		else if (lo->transfer)
 			ret = lo_write_transfer(lo, rq, pos);
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index f504232..a3f1b7a 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -3677,7 +3677,7 @@ static int mtip_submit_request(struct blk_mq_hw_ctx *hctx, struct request *rq)
 			return -ENXIO;
 	}
 
-	if (rq->cmd_flags & REQ_DISCARD) {
+	if (rq->op == REQ_OP_DISCARD) {
 		int err;
 
 		err = mtip_send_trim(dd, blk_rq_pos(rq), blk_rq_sectors(rq));
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 1b87623..2d24c1a 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -242,7 +242,7 @@ static int nbd_send_req(struct nbd_device *nbd, struct request *req)
 
 	if (req->cmd_type == REQ_TYPE_DRV_PRIV)
 		type = NBD_CMD_DISC;
-	else if (req->cmd_flags & REQ_DISCARD)
+	else if (req->op == REQ_OP_DISCARD)
 		type = NBD_CMD_TRIM;
 	else if (req->cmd_flags & REQ_FLUSH)
 		type = NBD_CMD_FLUSH;
diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index ccc0c1f..aeba59e 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -440,7 +440,7 @@ __nvme_alloc_iod(unsigned nseg, unsigned bytes, struct nvme_dev *dev,
 static struct nvme_iod *nvme_alloc_iod(struct request *rq, struct nvme_dev *dev,
 			               gfp_t gfp)
 {
-	unsigned size = !(rq->cmd_flags & REQ_DISCARD) ? blk_rq_bytes(rq) :
+	unsigned size = !(rq->op == REQ_OP_DISCARD) ? blk_rq_bytes(rq) :
                                                 sizeof(struct nvme_dsm_range);
 	struct nvme_iod *iod;
 
@@ -877,7 +877,7 @@ static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
 	if (!iod)
 		return BLK_MQ_RQ_QUEUE_BUSY;
 
-	if (req->cmd_flags & REQ_DISCARD) {
+	if (req->op == REQ_OP_DISCARD) {
 		void *range;
 		/*
 		 * We reuse the small pool to allocate the 16-byte range here
@@ -927,7 +927,7 @@ static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
 	spin_lock_irq(&nvmeq->q_lock);
 	if (req->cmd_type == REQ_TYPE_DRV_PRIV)
 		nvme_submit_priv(nvmeq, req, iod);
-	else if (req->cmd_flags & REQ_DISCARD)
+	else if (req->op == REQ_OP_DISCARD)
 		nvme_submit_discard(nvmeq, ns, req, iod);
 	else if (req->cmd_flags & REQ_FLUSH)
 		nvme_submit_flush(nvmeq, ns, req->tag);
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 39104ca..5ee8abe 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -3375,7 +3375,7 @@ static void rbd_queue_workfn(struct work_struct *work)
 		goto err;
 	}
 
-	if (rq->cmd_flags & REQ_DISCARD)
+	if (rq->op == REQ_OP_DISCARD)
 		op_type = OBJ_OP_DISCARD;
 	else if (rq_data_dir(rq) == WRITE)
 		op_type = OBJ_OP_WRITE;
diff --git a/drivers/block/skd_main.c b/drivers/block/skd_main.c
index 586f916..f89a0c8 100644
--- a/drivers/block/skd_main.c
+++ b/drivers/block/skd_main.c
@@ -576,7 +576,6 @@ static void skd_request_fn(struct request_queue *q)
 	struct request *req = NULL;
 	struct skd_scsi_request *scsi_req;
 	struct page *page;
-	unsigned long io_flags;
 	int error;
 	u32 lba;
 	u32 count;
@@ -624,12 +623,11 @@ static void skd_request_fn(struct request_queue *q)
 		lba = (u32)blk_rq_pos(req);
 		count = blk_rq_sectors(req);
 		data_dir = rq_data_dir(req);
-		io_flags = req->cmd_flags;
 
-		if (io_flags & REQ_FLUSH)
+		if (req->cmd_flags & REQ_FLUSH)
 			flush++;
 
-		if (io_flags & REQ_FUA)
+		if (req->cmd_flags & REQ_FUA)
 			fua++;
 
 		pr_debug("%s:%s:%d new req=%p lba=%u(0x%x) "
@@ -735,7 +733,7 @@ static void skd_request_fn(struct request_queue *q)
 		else
 			skreq->sg_data_dir = SKD_DATA_DIR_HOST_TO_CARD;
 
-		if (io_flags & REQ_DISCARD) {
+		if (req->op == REQ_OP_DISCARD) {
 			page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 			if (!page) {
 				pr_err("request_fn:Page allocation failed.\n");
@@ -852,9 +850,8 @@ static void skd_end_request(struct skd_device *skdev,
 			    struct skd_request_context *skreq, int error)
 {
 	struct request *req = skreq->req;
-	unsigned int io_flags = req->cmd_flags;
 
-	if ((io_flags & REQ_DISCARD) &&
+	if ((req->op == REQ_OP_DISCARD) &&
 		(skreq->discard_page == 1)) {
 		pr_debug("%s:%s:%d, free the page!",
 			 skdev->name, __func__, __LINE__);
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index ec76178..91eccd1 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -452,7 +452,8 @@ static int blkif_queue_request(struct request *req)
 	id = get_id_from_freelist(info);
 	info->shadow[id].request = req;
 
-	if (unlikely(req->cmd_flags & (REQ_DISCARD | REQ_SECURE))) {
+	if (unlikely(req->op == REQ_OP_DISCARD ||
+		     req->cmd_flags & REQ_SECURE)) {
 		ring_req->operation = BLKIF_OP_DISCARD;
 		ring_req->u.discard.nr_sectors = blk_rq_sectors(req);
 		ring_req->u.discard.id = id;
@@ -1533,8 +1534,9 @@ static int blkif_recover(struct blkfront_info *info)
 		/*
 		 * Get the bios in the request so we can re-queue them.
 		 */
-		if (copy[i].request->cmd_flags &
-		    (REQ_FLUSH | REQ_FUA | REQ_DISCARD | REQ_SECURE)) {
+		if (copy[i].request->cmd_flags & REQ_FLUSH ||
+		    copy[i].request->op == REQ_OP_DISCARD ||
+		    copy[i].request->cmd_flags & (REQ_FUA | REQ_SECURE)) {
 			/*
 			 * Flush operations don't contain bios, so
 			 * we need to requeue the whole request
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index ea4bc70..e03ca09 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1245,7 +1245,7 @@ static void dm_done(struct request *clone, int error, bool mapped)
 			r = rq_end_io(tio->ti, clone, error, &tio->info);
 	}
 
-	if (unlikely(r == -EREMOTEIO && (clone->cmd_flags & REQ_WRITE_SAME) &&
+	if (unlikely(r == -EREMOTEIO && (clone->op == REQ_OP_WRITE_SAME) &&
 		     !clone->q->limits.max_write_same_sectors))
 		disable_write_same(tio->md);
 
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index c742cfd..e99361f 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1613,8 +1613,7 @@ static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
 		    !IS_ALIGNED(blk_rq_sectors(next), 8))
 			break;
 
-		if (next->cmd_flags & REQ_DISCARD ||
-		    next->cmd_flags & REQ_FLUSH)
+		if (next->op == REQ_OP_DISCARD || next->cmd_flags & REQ_FLUSH)
 			break;
 
 		if (rq_data_dir(cur) != rq_data_dir(next))
@@ -2055,7 +2054,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 	}
 
 	mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
-	if (cmd_flags & REQ_DISCARD) {
+	if (req && req->op == REQ_OP_DISCARD) {
 		/* complete ongoing async transfer before issuing discard */
 		if (card->host->areq)
 			mmc_blk_issue_rw_rq(mq, NULL);
@@ -2079,7 +2078,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 
 out:
 	if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
-	     (cmd_flags & MMC_REQ_SPECIAL_MASK))
+	    mmc_req_is_special(req))
 		/*
 		 * Release host when there are no more requests
 		 * and after special request(discard, flush) is done.
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index 6f4323c..9fb8d21 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -33,7 +33,7 @@ static int mmc_prep_request(struct request_queue *q, struct request *req)
 	/*
 	 * We only like normal block requests and discards.
 	 */
-	if (req->cmd_type != REQ_TYPE_FS && !(req->cmd_flags & REQ_DISCARD)) {
+	if (req->cmd_type != REQ_TYPE_FS && req->op != REQ_OP_DISCARD) {
 		blk_dump_rq_flags(req, "MMC bad request");
 		return BLKPREP_KILL;
 	}
@@ -56,7 +56,6 @@ static int mmc_queue_thread(void *d)
 	down(&mq->thread_sem);
 	do {
 		struct request *req = NULL;
-		unsigned int cmd_flags = 0;
 
 		spin_lock_irq(q->queue_lock);
 		set_current_state(TASK_INTERRUPTIBLE);
@@ -66,7 +65,6 @@ static int mmc_queue_thread(void *d)
 
 		if (req || mq->mqrq_prev->req) {
 			set_current_state(TASK_RUNNING);
-			cmd_flags = req ? req->cmd_flags : 0;
 			mq->issue_fn(mq, req);
 			cond_resched();
 			if (mq->flags & MMC_QUEUE_NEW_REQUEST) {
@@ -81,7 +79,7 @@ static int mmc_queue_thread(void *d)
 			 * has been finished. Do not assign it to previous
 			 * request.
 			 */
-			if (cmd_flags & MMC_REQ_SPECIAL_MASK)
+			if (mmc_req_is_special(req))
 				mq->mqrq_cur->req = NULL;
 
 			mq->mqrq_prev->brq.mrq.data = NULL;
diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h
index 36cddab..f166e5b 100644
--- a/drivers/mmc/card/queue.h
+++ b/drivers/mmc/card/queue.h
@@ -1,7 +1,10 @@
 #ifndef MMC_QUEUE_H
 #define MMC_QUEUE_H
 
-#define MMC_REQ_SPECIAL_MASK	(REQ_DISCARD | REQ_FLUSH)
+static inline bool mmc_req_is_special(struct request *req)
+{
+	return req && (req->cmd_flags & REQ_FLUSH || req->op == REQ_OP_DISCARD);
+}
 
 struct request;
 struct task_struct;
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 44dc965..49017f0 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -94,7 +94,7 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
 	    get_capacity(req->rq_disk))
 		return -EIO;
 
-	if (req->cmd_flags & REQ_DISCARD)
+	if (req->op == REQ_OP_DISCARD)
 		return tr->discard(dev, block, nsect);
 
 	if (rq_data_dir(req) == READ) {
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 3f37022..353508c 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1122,21 +1122,27 @@ static int sd_init_command(struct scsi_cmnd *cmd)
 {
 	struct request *rq = cmd->request;
 
-	if (rq->cmd_flags & REQ_DISCARD)
+	switch (rq->op) {
+	case REQ_OP_DISCARD:
 		return sd_setup_discard_cmnd(cmd);
-	else if (rq->cmd_flags & REQ_WRITE_SAME)
+	case REQ_OP_WRITE_SAME:
 		return sd_setup_write_same_cmnd(cmd);
-	else if (rq->cmd_flags & REQ_FLUSH)
-		return sd_setup_flush_cmnd(cmd);
-	else
-		return sd_setup_read_write_cmnd(cmd);
+	case REQ_OP_READ:
+	case REQ_OP_WRITE:
+		if (rq->cmd_flags & REQ_FLUSH)
+			return sd_setup_flush_cmnd(cmd);
+		else
+			return sd_setup_read_write_cmnd(cmd);
+	default:
+		BUG();
+	}
 }
 
 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
 {
 	struct request *rq = SCpnt->request;
 
-	if (rq->cmd_flags & REQ_DISCARD)
+	if (rq->op == REQ_OP_DISCARD)
 		__free_page(rq->completion_data);
 
 	if (SCpnt->cmnd != rq->cmd) {
@@ -1658,7 +1664,7 @@ static int sd_done(struct scsi_cmnd *SCpnt)
 	unsigned char op = SCpnt->cmnd[0];
 	unsigned char unmap = SCpnt->cmnd[1] & 8;
 
-	if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
+	if (req->op == REQ_OP_DISCARD || req->op == REQ_OP_WRITE_SAME) {
 		if (!result) {
 			good_bytes = blk_rq_bytes(req);
 			scsi_set_resid(SCpnt, 0);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 4376ec6..d930191 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -618,14 +618,14 @@ static inline unsigned int blk_queue_cluster(struct request_queue *q)
 /*
  * We regard a request as sync, if either a read or a sync write
  */
-static inline bool rw_is_sync(unsigned int rw_flags)
+static inline bool rw_is_sync(int op, unsigned int rw_flags)
 {
-	return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC);
+	return (op_to_data_dir(op) == READ) || (rw_flags & REQ_SYNC);
 }
 
 static inline bool rq_is_sync(struct request *rq)
 {
-	return rw_is_sync(rq->cmd_flags);
+	return rw_is_sync(rq->op, rq->cmd_flags);
 }
 
 static inline bool blk_rl_full(struct request_list *rl, bool sync)
@@ -660,16 +660,16 @@ static inline bool rq_mergeable(struct request *rq)
 	return true;
 }
 
-static inline bool blk_check_merge_flags(unsigned int flags1,
-					 unsigned int flags2)
+static inline bool blk_check_merge_flags(unsigned int flags1, unsigned int op1,
+					 unsigned int flags2, unsigned int op2)
 {
-	if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD))
+	if ((op1 == REQ_OP_DISCARD) != (op2 == REQ_OP_DISCARD))
 		return false;
 
 	if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE))
 		return false;
 
-	if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME))
+	if ((op1 == REQ_OP_WRITE_SAME) != (op2 == REQ_OP_WRITE_SAME))
 		return false;
 
 	return true;
@@ -863,12 +863,12 @@ static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
 }
 
 static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
-						     unsigned int cmd_flags)
+						     int op)
 {
-	if (unlikely(cmd_flags & REQ_DISCARD))
+	if (unlikely(op == REQ_OP_DISCARD))
 		return min(q->limits.max_discard_sectors, UINT_MAX >> 9);
 
-	if (unlikely(cmd_flags & REQ_WRITE_SAME))
+	if (unlikely(op == REQ_OP_WRITE_SAME))
 		return q->limits.max_write_same_sectors;
 
 	return q->limits.max_sectors;
@@ -895,11 +895,11 @@ static inline unsigned int blk_rq_get_max_sectors(struct request *rq)
 	if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC))
 		return q->limits.max_hw_sectors;
 
-	if (!q->limits.chunk_sectors || (rq->cmd_flags & REQ_DISCARD))
-		return blk_queue_get_max_sectors(q, rq->cmd_flags);
+	if (!q->limits.chunk_sectors || (rq->op == REQ_OP_DISCARD))
+		return blk_queue_get_max_sectors(q, rq->op);
 
 	return min(blk_max_size_offset(q, blk_rq_pos(rq)),
-			blk_queue_get_max_sectors(q, rq->cmd_flags));
+			blk_queue_get_max_sectors(q, rq->op));
 }
 
 static inline unsigned int blk_rq_count_bios(struct request *rq)
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index 638b324..953d286 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -26,7 +26,7 @@ typedef int (elevator_dispatch_fn) (struct request_queue *, int);
 typedef void (elevator_add_req_fn) (struct request_queue *, struct request *);
 typedef struct request *(elevator_request_list_fn) (struct request_queue *, struct request *);
 typedef void (elevator_completed_req_fn) (struct request_queue *, struct request *);
-typedef int (elevator_may_queue_fn) (struct request_queue *, int);
+typedef int (elevator_may_queue_fn) (struct request_queue *, int, int);
 
 typedef void (elevator_init_icq_fn) (struct io_cq *);
 typedef void (elevator_exit_icq_fn) (struct io_cq *);
@@ -134,7 +134,7 @@ extern struct request *elv_former_request(struct request_queue *, struct request
 extern struct request *elv_latter_request(struct request_queue *, struct request *);
 extern int elv_register_queue(struct request_queue *q);
 extern void elv_unregister_queue(struct request_queue *q);
-extern int elv_may_queue(struct request_queue *, int);
+extern int elv_may_queue(struct request_queue *, int, int);
 extern void elv_completed_request(struct request_queue *, struct request *);
 extern int elv_set_request(struct request_queue *q, struct request *rq,
 			   struct bio *bio, gfp_t gfp_mask);
-- 
1.8.3.1

[PATCH 30/32] drbd: don't use bi_rw for operations

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This removes drbd's bi_rw use for operations read, write,
discard, write same, etc (REQ_OPs).

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 drivers/block/drbd/drbd_actlog.c   |  2 +-
 drivers/block/drbd/drbd_bitmap.c   |  1 -
 drivers/block/drbd/drbd_main.c     | 15 ++++++++-------
 drivers/block/drbd/drbd_receiver.c | 22 ++++++++--------------
 drivers/block/drbd/drbd_worker.c   |  4 ++--
 5 files changed, 19 insertions(+), 25 deletions(-)

diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index ed2eafe..fc96a3c 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -159,7 +159,7 @@ static int _drbd_md_sync_page_io(struct drbd_device *device,
 		goto out;
 	bio->bi_private = device;
 	bio->bi_end_io = drbd_md_endio;
-	bio->bi_rw = op | op_flags;
+	bio->bi_rw = op_flags;
 	bio->bi_op = op;
 
 	if (op != REQ_OP_WRITE && device->state.disk == D_DISKLESS && device->ldev == NULL)
diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index 2ff407a..173a3d6 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -1022,7 +1022,6 @@ static void bm_page_io_async(struct drbd_bm_aio_ctx *ctx, int page_nr) __must_ho
 
 	if (drbd_insert_fault(device, (rw == REQ_OP_WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD)) {
 		bio->bi_op = rw;
-		bio->bi_rw |= rw;
 		bio_io_error(bio);
 	} else {
 		submit_bio(rw, 0, bio);
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 9eb8039..d74178c 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -1602,15 +1602,16 @@ static int _drbd_send_zc_ee(struct drbd_peer_device *peer_device,
 	return 0;
 }
 
-static u32 bio_flags_to_wire(struct drbd_connection *connection, unsigned long bi_rw)
+static u32 bio_flags_to_wire(struct drbd_connection *connection,
+			     struct bio *bio)
 {
 	if (connection->agreed_pro_version >= 95)
-		return  (bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) |
-			(bi_rw & REQ_FUA ? DP_FUA : 0) |
-			(bi_rw & REQ_FLUSH ? DP_FLUSH : 0) |
-			(bi_rw & REQ_DISCARD ? DP_DISCARD : 0);
+		return  (bio->bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) |
+			(bio->bi_rw & REQ_FUA ? DP_FUA : 0) |
+			(bio->bi_rw & REQ_FLUSH ? DP_FLUSH : 0) |
+			(bio->bi_op == REQ_OP_DISCARD ? DP_DISCARD : 0);
 	else
-		return bi_rw & REQ_SYNC ? DP_RW_SYNC : 0;
+		return bio->bi_rw & REQ_SYNC ? DP_RW_SYNC : 0;
 }
 
 /* Used to send write or TRIM aka REQ_DISCARD requests
@@ -1635,7 +1636,7 @@ int drbd_send_dblock(struct drbd_peer_device *peer_device, struct drbd_request *
 	p->sector = cpu_to_be64(req->i.sector);
 	p->block_id = (unsigned long)req;
 	p->seq_num = cpu_to_be32(atomic_inc_return(&device->packet_seq));
-	dp_flags = bio_flags_to_wire(peer_device->connection, req->master_bio->bi_rw);
+	dp_flags = bio_flags_to_wire(peer_device->connection, req->master_bio);
 	if (device->state.conn >= C_SYNC_SOURCE &&
 	    device->state.conn <= C_PAUSED_SYNC_T)
 		dp_flags |= DP_MAY_SET_IN_SYNC;
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 4e458bd..44193da 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -1418,7 +1418,7 @@ next_bio:
 	/* > peer_req->i.sector, unless this is the first bio */
 	bio->bi_iter.bi_sector = sector;
 	bio->bi_bdev = device->ldev->backing_bdev;
-	bio->bi_rw = op | op_flags;
+	bio->bi_rw = op_flags;
 	bio->bi_op = op;
 	bio->bi_private = peer_req;
 	bio->bi_end_io = drbd_peer_request_endio;
@@ -1427,7 +1427,7 @@ next_bio:
 	bios = bio;
 	++n_bios;
 
-	if (op & REQ_OP_DISCARD) {
+	if (op == REQ_OP_DISCARD) {
 		bio->bi_iter.bi_size = data_size;
 		goto submit;
 	}
@@ -2132,8 +2132,7 @@ static unsigned long wire_flags_to_bio_flags(u32 dpf)
 {
 	return  (dpf & DP_RW_SYNC ? REQ_SYNC : 0) |
 		(dpf & DP_FUA ? REQ_FUA : 0) |
-		(dpf & DP_FLUSH ? REQ_FLUSH : 0) |
-		(dpf & DP_DISCARD ? REQ_DISCARD : 0);
+		(dpf & DP_FLUSH ? REQ_FLUSH : 0);
 }
 
 static unsigned long wire_flags_to_bio_op(u32 dpf)
@@ -2141,7 +2140,7 @@ static unsigned long wire_flags_to_bio_op(u32 dpf)
 	if (dpf & DP_DISCARD)
 		return REQ_OP_DISCARD;
 	else
-		return 0;
+		return REQ_OP_WRITE;;
 }
 
 static void fail_postponed_requests(struct drbd_device *device, sector_t sector,
@@ -2287,7 +2286,7 @@ static int receive_Data(struct drbd_connection *connection, struct packet_info *
 	struct drbd_peer_request *peer_req;
 	struct p_data *p = pi->data;
 	u32 peer_seq = be32_to_cpu(p->seq_num);
-	int op = REQ_OP_WRITE, op_flags = 0;
+	int op, op_flags;
 	u32 dp_flags;
 	int err, tp;
 
@@ -2326,20 +2325,15 @@ static int receive_Data(struct drbd_connection *connection, struct packet_info *
 	peer_req->flags |= EE_APPLICATION;
 
 	dp_flags = be32_to_cpu(p->dp_flags);
-	/*
-	 * Tmp compat. We OR it here because other code assumes both the
-	 * discard and write flags are set. In the next patches that
-	 * will be cleaned up.
-	 */
-	op |= wire_flags_to_bio_op(dp_flags);
-	op_flags |= wire_flags_to_bio_flags(dp_flags);
+	op = wire_flags_to_bio_op(dp_flags);
+	op_flags = wire_flags_to_bio_flags(dp_flags);
 	if (pi->cmd == P_TRIM) {
 		struct request_queue *q = bdev_get_queue(device->ldev->backing_bdev);
 		peer_req->flags |= EE_IS_TRIM;
 		if (!blk_queue_discard(q))
 			peer_req->flags |= EE_IS_TRIM_USE_ZEROOUT;
 		D_ASSERT(peer_device, peer_req->i.size > 0);
-		D_ASSERT(peer_device, op & REQ_OP_DISCARD);
+		D_ASSERT(peer_device, op == REQ_OP_DISCARD);
 		D_ASSERT(peer_device, peer_req->pages == NULL);
 	} else if (peer_req->pages == NULL) {
 		D_ASSERT(device, peer_req->i.size == 0);
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index 23e5500..f1c63d2 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -175,7 +175,7 @@ void drbd_peer_request_endio(struct bio *bio)
 	struct drbd_peer_request *peer_req = bio->bi_private;
 	struct drbd_device *device = peer_req->peer_device->device;
 	int is_write = bio_data_dir(bio) == WRITE;
-	int is_discard = !!(bio->bi_rw & REQ_DISCARD);
+	int is_discard = (bio->bi_op == REQ_OP_DISCARD);
 
 	if (bio->bi_error && __ratelimit(&drbd_ratelimit_state))
 		drbd_warn(device, "%s: error=%d s=%llus\n",
@@ -243,7 +243,7 @@ void drbd_request_endio(struct bio *bio)
 
 	/* to avoid recursion in __req_mod */
 	if (unlikely(bio->bi_error)) {
-		if (bio->bi_rw & REQ_DISCARD)
+		if (bio->bi_op == REQ_OP_DISCARD)
 			what = (bio->bi_error == -EOPNOTSUPP)
 				? DISCARD_COMPLETED_NOTSUPP
 				: DISCARD_COMPLETED_WITH_ERROR;
-- 
1.8.3.1

[PATCH 31/32] block/fs/driver: rm bio bi_rw REQ_OP use

[mchristi]

From: Mike Christie <mchristi@redhat.com>

With this patch we no longer use the bio->bi_rw field
for REQ_WRITE, REQ_DISCARD, REQ_WRITE_SAME, (REQ_OPs). bi_rw should
only set REQ_XYZ values and bi_op is for REQ_OPs.

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 block/bio.c                                 | 15 +++------
 block/blk-core.c                            | 10 +++---
 block/blk-lib.c                             |  9 ++---
 block/blk-map.c                             |  4 +--
 block/blk-merge.c                           | 12 +++----
 drivers/block/brd.c                         |  2 +-
 drivers/block/pktcdvd.c                     |  2 --
 drivers/block/rsxx/dma.c                    |  2 +-
 drivers/block/xen-blkfront.c                |  5 +--
 drivers/block/zram/zram_drv.c               |  2 +-
 drivers/md/bcache/journal.c                 |  6 ++--
 drivers/md/bcache/movinggc.c                |  2 +-
 drivers/md/bcache/request.c                 | 11 +++---
 drivers/md/bcache/writeback.c               |  4 +--
 drivers/md/dm-cache-target.c                | 10 +++---
 drivers/md/dm-crypt.c                       |  2 +-
 drivers/md/dm-io.c                          | 12 +++----
 drivers/md/dm-kcopyd.c                      |  2 +-
 drivers/md/dm-log-writes.c                  |  2 +-
 drivers/md/dm-raid1.c                       | 10 +++---
 drivers/md/dm-region-hash.c                 |  4 +--
 drivers/md/dm-stripe.c                      |  4 +--
 drivers/md/dm-thin.c                        | 15 +++++----
 drivers/md/dm.c                             |  6 ++--
 drivers/md/linear.c                         |  2 +-
 drivers/md/raid0.c                          |  2 +-
 drivers/md/raid1.c                          | 25 ++++++--------
 drivers/md/raid10.c                         | 34 +++++++++----------
 drivers/md/raid5.c                          | 20 ++++-------
 drivers/scsi/osd/osd_initiator.c            |  4 ---
 drivers/staging/lustre/lustre/llite/lloop.c |  8 ++---
 drivers/target/target_core_pscsi.c          |  4 +--
 fs/btrfs/volumes.c                          |  6 ++--
 fs/exofs/ore.c                              |  1 -
 include/linux/bio.h                         | 15 ++++++---
 include/linux/blk_types.h                   | 13 +++-----
 include/linux/blktrace_api.h                |  2 +-
 include/linux/fs.h                          | 29 ++++++++++------
 include/trace/events/bcache.h               | 12 ++++---
 include/trace/events/block.h                | 31 +++++++++++------
 kernel/trace/blktrace.c                     | 52 ++++++++++++++++-------------
 41 files changed, 204 insertions(+), 209 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index 1cf8428..064a858 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -669,10 +669,10 @@ struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
 	bio->bi_iter.bi_sector	= bio_src->bi_iter.bi_sector;
 	bio->bi_iter.bi_size	= bio_src->bi_iter.bi_size;
 
-	if (bio->bi_rw & REQ_DISCARD)
+	if (bio->bi_op == REQ_OP_DISCARD)
 		goto integrity_clone;
 
-	if (bio->bi_rw & REQ_WRITE_SAME) {
+	if (bio->bi_op == REQ_OP_WRITE_SAME) {
 		bio->bi_io_vec[bio->bi_vcnt++] = bio_src->bi_io_vec[0];
 		goto integrity_clone;
 	}
@@ -1170,10 +1170,8 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
 	if (!bio)
 		goto out_bmd;
 
-	if (iter->type & WRITE) {
-		bio->bi_rw |= REQ_WRITE;
+	if (iter->type & WRITE)
 		bio->bi_op = REQ_OP_WRITE;
-	}
 
 	ret = 0;
 
@@ -1342,10 +1340,8 @@ struct bio *bio_map_user_iov(struct request_queue *q,
 	/*
 	 * set data direction, and check if mapped pages need bouncing
 	 */
-	if (iter->type & WRITE) {
-		bio->bi_rw |= REQ_WRITE;
+	if (iter->type & WRITE)
 		bio->bi_op = REQ_OP_WRITE;
-	}
 
 	bio_set_flag(bio, BIO_USER_MAPPED);
 
@@ -1538,7 +1534,6 @@ struct bio *bio_copy_kern(struct request_queue *q, void *data, unsigned int len,
 		bio->bi_private = data;
 	} else {
 		bio->bi_end_io = bio_copy_kern_endio;
-		bio->bi_rw |= REQ_WRITE;
 		bio->bi_op = REQ_OP_WRITE;
 	}
 
@@ -1798,7 +1793,7 @@ struct bio *bio_split(struct bio *bio, int sectors,
 	 * Discards need a mutable bio_vec to accommodate the payload
 	 * required by the DSM TRIM and UNMAP commands.
 	 */
-	if (bio->bi_rw & REQ_DISCARD)
+	if (bio->bi_op == REQ_OP_DISCARD)
 		split = bio_clone_bioset(bio, gfp, bs);
 	else
 		split = bio_clone_fast(bio, gfp, bs);
diff --git a/block/blk-core.c b/block/blk-core.c
index deb8bfd..c270a4a 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1873,14 +1873,14 @@ generic_make_request_checks(struct bio *bio)
 		}
 	}
 
-	if ((bio->bi_rw & REQ_DISCARD) &&
+	if ((bio->bi_op == REQ_OP_DISCARD) &&
 	    (!blk_queue_discard(q) ||
 	     ((bio->bi_rw & REQ_SECURE) && !blk_queue_secdiscard(q)))) {
 		err = -EOPNOTSUPP;
 		goto end_io;
 	}
 
-	if (bio->bi_rw & REQ_WRITE_SAME && !bdev_write_same(bio->bi_bdev)) {
+	if (bio->bi_op == REQ_OP_WRITE_SAME && !bdev_write_same(bio->bi_bdev)) {
 		err = -EOPNOTSUPP;
 		goto end_io;
 	}
@@ -1992,7 +1992,7 @@ EXPORT_SYMBOL(generic_make_request);
  */
 void submit_bio(int op, int flags, struct bio *bio)
 {
-	bio->bi_rw |= op | flags;
+	bio->bi_rw |= flags;
 	bio->bi_op = op;
 
 	/*
@@ -2002,7 +2002,7 @@ void submit_bio(int op, int flags, struct bio *bio)
 	if (bio_has_data(bio)) {
 		unsigned int count;
 
-		if (unlikely(op == REQ_WRITE_SAME))
+		if (unlikely(op == REQ_OP_WRITE_SAME))
 			count = bdev_logical_block_size(bio->bi_bdev) >> 9;
 		else
 			count = bio_sectors(bio);
@@ -2873,8 +2873,6 @@ EXPORT_SYMBOL_GPL(__blk_end_request_err);
 void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
 		     struct bio *bio)
 {
-	/* Bit 0 (R/W) is identical in rq->cmd_flags and bio->bi_rw */
-	rq->cmd_flags |= bio->bi_rw & REQ_WRITE;
 	rq->op = bio->bi_op;
 
 	if (bio_has_data(bio))
diff --git a/block/blk-lib.c b/block/blk-lib.c
index 49786b0..77bba0a 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -43,7 +43,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
 	DECLARE_COMPLETION_ONSTACK(wait);
 	struct request_queue *q = bdev_get_queue(bdev);
 	int op = REQ_OP_DISCARD;
-	int op_flags = REQ_WRITE;
+	int op_flags = 0;
 	unsigned int granularity;
 	int alignment;
 	struct bio_batch bb;
@@ -189,12 +189,7 @@ int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
 		}
 
 		atomic_inc(&bb.done);
-		/*
-		 * REQ_WRITE being passed as a flag is temp until
-		 * code that assumes REQ_WRITE is set for WRITE_SAME
-		 * is converted.
-		 */
-		submit_bio(REQ_OP_WRITE_SAME, REQ_WRITE, bio);
+		submit_bio(REQ_OP_WRITE_SAME, 0, bio);
 	}
 
 	/* Wait for bios in-flight */
diff --git a/block/blk-map.c b/block/blk-map.c
index 4a91dc4..9021a8f 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -223,10 +223,8 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
 	if (IS_ERR(bio))
 		return PTR_ERR(bio);
 
-	if (!reading) {
-		bio->bi_rw |= REQ_WRITE;
+	if (!reading)
 		bio->bi_op = REQ_OP_WRITE;
-	}
 
 	if (do_copy)
 		rq->cmd_flags |= REQ_COPY_USER;
diff --git a/block/blk-merge.c b/block/blk-merge.c
index ec42c7e..7550411 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -116,9 +116,9 @@ void blk_queue_split(struct request_queue *q, struct bio **bio,
 {
 	struct bio *split;
 
-	if ((*bio)->bi_rw & REQ_DISCARD)
+	if ((*bio)->bi_op == REQ_OP_DISCARD)
 		split = blk_bio_discard_split(q, *bio, bs);
-	else if ((*bio)->bi_rw & REQ_WRITE_SAME)
+	else if ((*bio)->bi_op == REQ_OP_WRITE_SAME)
 		split = blk_bio_write_same_split(q, *bio, bs);
 	else
 		split = blk_bio_segment_split(q, *bio, q->bio_split);
@@ -148,10 +148,10 @@ static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
 	 * This should probably be returning 0, but blk_add_request_payload()
 	 * (Christoph!!!!)
 	 */
-	if (bio->bi_rw & REQ_DISCARD)
+	if (bio->bi_op == REQ_OP_DISCARD)
 		return 1;
 
-	if (bio->bi_rw & REQ_WRITE_SAME)
+	if (bio->bi_op == REQ_OP_WRITE_SAME)
 		return 1;
 
 	fbio = bio;
@@ -324,7 +324,7 @@ static int __blk_bios_map_sg(struct request_queue *q, struct bio *bio,
 	nsegs = 0;
 	cluster = blk_queue_cluster(q);
 
-	if (bio->bi_rw & REQ_DISCARD) {
+	if (bio->bi_op == REQ_OP_DISCARD) {
 		/*
 		 * This is a hack - drivers should be neither modifying the
 		 * biovec, nor relying on bi_vcnt - but because of
@@ -339,7 +339,7 @@ static int __blk_bios_map_sg(struct request_queue *q, struct bio *bio,
 		return 0;
 	}
 
-	if (bio->bi_rw & REQ_WRITE_SAME) {
+	if (bio->bi_op == REQ_OP_WRITE_SAME) {
 single_segment:
 		*sg = sglist;
 		bvec = bio_iovec(bio);
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index b9794ae..657e4c5 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -336,7 +336,7 @@ static void brd_make_request(struct request_queue *q, struct bio *bio)
 	if (bio_end_sector(bio) > get_capacity(bdev->bd_disk))
 		goto io_error;
 
-	if (unlikely(bio->bi_rw & REQ_DISCARD)) {
+	if (unlikely(bio->bi_op == REQ_OP_DISCARD)) {
 		discard_from_brd(brd, sector, bio->bi_iter.bi_size);
 		goto out;
 	}
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index bbb7a45..aeb296f 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -1074,7 +1074,6 @@ static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
 			BUG();
 
 		atomic_inc(&pkt->io_wait);
-		bio->bi_rw = READ;
 		bio->bi_op = REQ_OP_READ;
 		pkt_queue_bio(pd, bio);
 		frames_read++;
@@ -1337,7 +1336,6 @@ static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
 
 	/* Start the write request */
 	atomic_set(&pkt->io_wait, 1);
-	pkt->w_bio->bi_rw = WRITE;
 	pkt->w_bio->bi_op = REQ_OP_WRITE;
 	pkt_queue_bio(pd, pkt->w_bio);
 }
diff --git a/drivers/block/rsxx/dma.c b/drivers/block/rsxx/dma.c
index cf8cd29..dfc189e 100644
--- a/drivers/block/rsxx/dma.c
+++ b/drivers/block/rsxx/dma.c
@@ -705,7 +705,7 @@ int rsxx_dma_queue_bio(struct rsxx_cardinfo *card,
 		dma_cnt[i] = 0;
 	}
 
-	if (bio->bi_rw & REQ_DISCARD) {
+	if (bio->bi_op == REQ_OP_DISCARD) {
 		bv_len = bio->bi_iter.bi_size;
 
 		while (bv_len > 0) {
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 91eccd1..09ea7cd 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1593,7 +1593,8 @@ static int blkif_recover(struct blkfront_info *info)
 				bio_trim(cloned_bio, offset, size);
 				cloned_bio->bi_private = split_bio;
 				cloned_bio->bi_end_io = split_bio_end;
-				submit_bio(cloned_bio->bi_rw, 0, cloned_bio);
+				submit_bio(cloned_bio->bi_op,
+					   cloned_bio->bi_rw, cloned_bio);
 			}
 			/*
 			 * Now we have to wait for all those smaller bios to
@@ -1602,7 +1603,7 @@ static int blkif_recover(struct blkfront_info *info)
 			continue;
 		}
 		/* We don't need to split this bio */
-		submit_bio(bio->bi_rw, 0, bio);
+		submit_bio(bio->bi_op, bio->bi_rw, bio);
 	}
 
 	return 0;
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 9fa15bb..3b6b9e6 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -849,7 +849,7 @@ static void __zram_make_request(struct zram *zram, struct bio *bio)
 	offset = (bio->bi_iter.bi_sector &
 		  (SECTORS_PER_PAGE - 1)) << SECTOR_SHIFT;
 
-	if (unlikely(bio->bi_rw & REQ_DISCARD)) {
+	if (unlikely(bio->bi_op == REQ_OP_DISCARD)) {
 		zram_bio_discard(zram, index, offset, bio);
 		bio_endio(bio);
 		return;
diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index d152e78..5dc383b8 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -55,7 +55,7 @@ reread:		left = ca->sb.bucket_size - offset;
 		bio->bi_iter.bi_sector	= bucket + offset;
 		bio->bi_bdev	= ca->bdev;
 		bio->bi_op	= REQ_OP_READ;
-		bio->bi_rw	= READ;
+		bio->bi_rw	= 0;
 		bio->bi_iter.bi_size	= len << 9;
 
 		bio->bi_end_io	= journal_read_endio;
@@ -454,7 +454,7 @@ static void do_journal_discard(struct cache *ca)
 						ca->sb.d[ja->discard_idx]);
 		bio->bi_bdev		= ca->bdev;
 		bio->bi_op		= REQ_OP_DISCARD;
-		bio->bi_rw		= REQ_WRITE|REQ_DISCARD;
+		bio->bi_rw		= 0;
 		bio->bi_max_vecs	= 1;
 		bio->bi_io_vec		= bio->bi_inline_vecs;
 		bio->bi_iter.bi_size	= bucket_bytes(ca);
@@ -629,7 +629,7 @@ static void journal_write_unlocked(struct closure *cl)
 		bio->bi_iter.bi_sector	= PTR_OFFSET(k, i);
 		bio->bi_bdev	= ca->bdev;
 		bio->bi_op	= REQ_OP_WRITE;
-		bio->bi_rw	= REQ_WRITE|REQ_SYNC|REQ_META|REQ_FLUSH|REQ_FUA;
+		bio->bi_rw	= REQ_SYNC|REQ_META|REQ_FLUSH|REQ_FUA;
 		bio->bi_iter.bi_size = sectors << 9;
 
 		bio->bi_end_io	= journal_write_endio;
diff --git a/drivers/md/bcache/movinggc.c b/drivers/md/bcache/movinggc.c
index 1318f32..78745ff 100644
--- a/drivers/md/bcache/movinggc.c
+++ b/drivers/md/bcache/movinggc.c
@@ -164,7 +164,7 @@ static void read_moving(struct cache_set *c)
 		bio = &io->bio.bio;
 
 		bio->bi_op	= REQ_OP_READ;
-		bio->bi_rw	= READ;
+		bio->bi_rw	= 0;
 		bio->bi_end_io	= read_moving_endio;
 
 		if (bio_alloc_pages(bio, GFP_KERNEL))
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 11f6b5c..0a35d7e 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -254,7 +254,6 @@ static void bch_data_insert_start(struct closure *cl)
 		bch_keylist_push(&op->insert_keys);
 
 		n->bi_op = REQ_OP_WRITE;
-		n->bi_rw |= REQ_WRITE;
 		bch_submit_bbio(n, op->c, k, 0);
 	} while (n != bio);
 
@@ -379,7 +378,7 @@ static bool check_should_bypass(struct cached_dev *dc, struct bio *bio)
 
 	if (test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags) ||
 	    c->gc_stats.in_use > CUTOFF_CACHE_ADD ||
-	    (bio->bi_rw & REQ_DISCARD))
+	    (bio->bi_op == REQ_OP_DISCARD))
 		goto skip;
 
 	if (mode == CACHE_MODE_NONE ||
@@ -900,7 +899,7 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
 	 * But check_overlapping drops dirty keys for which io hasn't started,
 	 * so we still want to call it.
 	 */
-	if (bio->bi_rw & REQ_DISCARD)
+	if (bio->bi_op == REQ_OP_DISCARD)
 		s->iop.bypass = true;
 
 	if (should_writeback(dc, s->orig_bio,
@@ -914,7 +913,7 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
 		s->iop.bio = s->orig_bio;
 		bio_get(s->iop.bio);
 
-		if (!(bio->bi_rw & REQ_DISCARD) ||
+		if (!(bio->bi_op == REQ_OP_DISCARD) ||
 		    blk_queue_discard(bdev_get_queue(dc->bdev)))
 			closure_bio_submit(bio, cl);
 	} else if (s->iop.writeback) {
@@ -993,7 +992,7 @@ static void cached_dev_make_request(struct request_queue *q, struct bio *bio)
 				cached_dev_read(dc, s);
 		}
 	} else {
-		if ((bio->bi_rw & REQ_DISCARD) &&
+		if ((bio->bi_op == REQ_OP_DISCARD) &&
 		    !blk_queue_discard(bdev_get_queue(dc->bdev)))
 			bio_endio(bio);
 		else
@@ -1101,7 +1100,7 @@ static void flash_dev_make_request(struct request_queue *q, struct bio *bio)
 					&KEY(d->id, bio->bi_iter.bi_sector, 0),
 					&KEY(d->id, bio_end_sector(bio), 0));
 
-		s->iop.bypass		= (bio->bi_rw & REQ_DISCARD) != 0;
+		s->iop.bypass		= (bio->bi_op == REQ_OP_DISCARD) != 0;
 		s->iop.writeback	= true;
 		s->iop.bio		= bio;
 
diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
index 28b1bae..f23d609 100644
--- a/drivers/md/bcache/writeback.c
+++ b/drivers/md/bcache/writeback.c
@@ -184,7 +184,7 @@ static void write_dirty(struct closure *cl)
 
 	dirty_init(w);
 	io->bio.bi_op		= REQ_OP_WRITE;
-	io->bio.bi_rw		= WRITE;
+	io->bio.bi_rw		= 0;
 	io->bio.bi_iter.bi_sector = KEY_START(&w->key);
 	io->bio.bi_bdev		= io->dc->bdev;
 	io->bio.bi_end_io	= dirty_endio;
@@ -258,7 +258,7 @@ static void read_dirty(struct cached_dev *dc)
 		io->bio.bi_bdev		= PTR_CACHE(dc->disk.c,
 						    &w->key, 0)->bdev;
 		io->bio.bi_op		= REQ_OP_READ;
-		io->bio.bi_rw		= READ;
+		io->bio.bi_rw		= 0;
 		io->bio.bi_end_io	= read_dirty_endio;
 
 		if (bio_alloc_pages(&io->bio, GFP_KERNEL))
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index dd90d12..1a13434 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -791,7 +791,8 @@ static void check_if_tick_bio_needed(struct cache *cache, struct bio *bio)
 
 	spin_lock_irqsave(&cache->lock, flags);
 	if (cache->need_tick_bio &&
-	    !(bio->bi_rw & (REQ_FUA | REQ_FLUSH | REQ_DISCARD))) {
+	    !(bio->bi_rw & (REQ_FUA | REQ_FLUSH) &&
+	    bio->bi_op != REQ_OP_DISCARD)) {
 		pb->tick = true;
 		cache->need_tick_bio = false;
 	}
@@ -854,7 +855,7 @@ static void inc_ds(struct cache *cache, struct bio *bio,
 static bool accountable_bio(struct cache *cache, struct bio *bio)
 {
 	return ((bio->bi_bdev == cache->origin_dev->bdev) &&
-		!(bio->bi_rw & REQ_DISCARD));
+		(bio->bi_op != REQ_OP_DISCARD));
 }
 
 static void accounted_begin(struct cache *cache, struct bio *bio)
@@ -1065,7 +1066,8 @@ static void dec_io_migrations(struct cache *cache)
 
 static bool discard_or_flush(struct bio *bio)
 {
-	return bio->bi_rw & (REQ_FLUSH | REQ_FUA | REQ_DISCARD);
+	return bio->bi_rw & (REQ_FLUSH | REQ_FUA) ||
+	       bio->bi_op == REQ_OP_DISCARD;
 }
 
 static void __cell_defer(struct cache *cache, struct dm_bio_prison_cell *cell)
@@ -1978,7 +1980,7 @@ static void process_deferred_bios(struct cache *cache)
 
 		if (bio->bi_rw & REQ_FLUSH)
 			process_flush_bio(cache, bio);
-		else if (bio->bi_rw & REQ_DISCARD)
+		else if (bio->bi_op == REQ_OP_DISCARD)
 			process_discard_bio(cache, &structs, bio);
 		else
 			process_bio(cache, &structs, bio);
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 92689e5..404c7005 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1911,7 +1911,7 @@ static int crypt_map(struct dm_target *ti, struct bio *bio)
 	 * - for REQ_FLUSH device-mapper core ensures that no IO is in-flight
 	 * - for REQ_DISCARD caller must use flush if IO ordering matters
 	 */
-	if (unlikely(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))) {
+	if (unlikely(bio->bi_rw & REQ_FLUSH || bio->bi_op == REQ_OP_DISCARD)) {
 		bio->bi_bdev = cc->dev->bdev;
 		if (bio_sectors(bio))
 			bio->bi_iter.bi_sector = cc->start +
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index f389380..6b514cd 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -297,11 +297,11 @@ static void do_region(int op, int op_flags, unsigned region,
 	/*
 	 * Reject unsupported discard and write same requests.
 	 */
-	if (op == REQ_DISCARD)
+	if (op == REQ_OP_DISCARD)
 		special_cmd_max_sectors = q->limits.max_discard_sectors;
-	else if (op == REQ_WRITE_SAME)
+	else if (op == REQ_OP_WRITE_SAME)
 		special_cmd_max_sectors = q->limits.max_write_same_sectors;
-	if ((op == REQ_DISCARD || op == REQ_WRITE_SAME) &&
+	if ((op == REQ_OP_DISCARD || op == REQ_OP_WRITE_SAME) &&
 	    special_cmd_max_sectors == 0) {
 		dec_count(io, region, -EOPNOTSUPP);
 		return;
@@ -315,7 +315,7 @@ static void do_region(int op, int op_flags, unsigned region,
 		/*
 		 * Allocate a suitably sized-bio.
 		 */
-		if ((op == REQ_DISCARD) || (op == REQ_WRITE_SAME))
+		if ((op == REQ_OP_DISCARD) || (op == REQ_OP_WRITE_SAME))
 			num_bvecs = 1;
 		else
 			num_bvecs = min_t(int, BIO_MAX_PAGES,
@@ -327,11 +327,11 @@ static void do_region(int op, int op_flags, unsigned region,
 		bio->bi_end_io = endio;
 		store_io_and_region_in_bio(bio, io, region);
 
-		if (op == REQ_DISCARD) {
+		if (op == REQ_OP_DISCARD) {
 			num_sectors = min_t(sector_t, special_cmd_max_sectors, remaining);
 			bio->bi_iter.bi_size = num_sectors << SECTOR_SHIFT;
 			remaining -= num_sectors;
-		} else if (op == REQ_WRITE_SAME) {
+		} else if (op == REQ_OP_WRITE_SAME) {
 			/*
 			 * WRITE SAME only uses a single page.
 			 */
diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c
index 02dccbe..9612bff 100644
--- a/drivers/md/dm-kcopyd.c
+++ b/drivers/md/dm-kcopyd.c
@@ -735,7 +735,7 @@ int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
 		/*
 		 * Use WRITE SAME to optimize zeroing if all dests support it.
 		 */
-		job->rw = WRITE | REQ_WRITE_SAME;
+		job->rw = REQ_OP_WRITE_SAME;
 		for (i = 0; i < job->num_dests; i++)
 			if (!bdev_write_same(job->dests[i].bdev)) {
 				job->rw = WRITE;
diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index 7bfaa91..6820654 100644
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -554,7 +554,7 @@ static int log_writes_map(struct dm_target *ti, struct bio *bio)
 	int i = 0;
 	bool flush_bio = (bio->bi_rw & REQ_FLUSH);
 	bool fua_bio = (bio->bi_rw & REQ_FUA);
-	bool discard_bio = (bio->bi_rw & REQ_DISCARD);
+	bool discard_bio = (bio->bi_op == REQ_OP_DISCARD);
 
 	pb->block = NULL;
 
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index ec48487..48da798 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -626,7 +626,7 @@ static void write_callback(unsigned long error, void *context)
 	 * If the bio is discard, return an error, but do not
 	 * degrade the array.
 	 */
-	if (bio->bi_rw & REQ_DISCARD) {
+	if (bio->bi_op == REQ_OP_DISCARD) {
 		bio->bi_error = -EOPNOTSUPP;
 		bio_endio(bio);
 		return;
@@ -665,8 +665,8 @@ static void do_write(struct mirror_set *ms, struct bio *bio)
 		.client = ms->io_client,
 	};
 
-	if (bio->bi_rw & REQ_DISCARD) {
-		io_req.bi_op_flags |= REQ_DISCARD;
+	if (bio->bi_op == REQ_OP_DISCARD) {
+		io_req.bi_op = REQ_OP_DISCARD;
 		io_req.mem.type = DM_IO_KMEM;
 		io_req.mem.ptr.addr = NULL;
 	}
@@ -705,7 +705,7 @@ static void do_writes(struct mirror_set *ms, struct bio_list *writes)
 
 	while ((bio = bio_list_pop(writes))) {
 		if ((bio->bi_rw & REQ_FLUSH) ||
-		    (bio->bi_rw & REQ_DISCARD)) {
+		    (bio->bi_op == REQ_OP_DISCARD)) {
 			bio_list_add(&sync, bio);
 			continue;
 		}
@@ -1253,7 +1253,7 @@ static int mirror_end_io(struct dm_target *ti, struct bio *bio, int error)
 	 * We need to dec pending if this was a write.
 	 */
 	if (rw == WRITE) {
-		if (!(bio->bi_rw & (REQ_FLUSH | REQ_DISCARD)))
+		if (!(bio->bi_rw & REQ_FLUSH || bio->bi_op == REQ_OP_DISCARD))
 			dm_rh_dec(ms->rh, bio_record->write_region);
 		return error;
 	}
diff --git a/drivers/md/dm-region-hash.c b/drivers/md/dm-region-hash.c
index b929fd5..adde887 100644
--- a/drivers/md/dm-region-hash.c
+++ b/drivers/md/dm-region-hash.c
@@ -405,7 +405,7 @@ void dm_rh_mark_nosync(struct dm_region_hash *rh, struct bio *bio)
 		return;
 	}
 
-	if (bio->bi_rw & REQ_DISCARD)
+	if (bio->bi_op == REQ_OP_DISCARD)
 		return;
 
 	/* We must inform the log that the sync count has changed. */
@@ -528,7 +528,7 @@ void dm_rh_inc_pending(struct dm_region_hash *rh, struct bio_list *bios)
 	struct bio *bio;
 
 	for (bio = bios->head; bio; bio = bio->bi_next) {
-		if (bio->bi_rw & (REQ_FLUSH | REQ_DISCARD))
+		if (bio->bi_rw & REQ_FLUSH || bio->bi_op == REQ_OP_DISCARD)
 			continue;
 		rh_inc(rh, dm_rh_bio_to_region(rh, bio));
 	}
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 797ddb9..12b1630 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -292,8 +292,8 @@ static int stripe_map(struct dm_target *ti, struct bio *bio)
 		bio->bi_bdev = sc->stripe[target_bio_nr].dev->bdev;
 		return DM_MAPIO_REMAPPED;
 	}
-	if (unlikely(bio->bi_rw & REQ_DISCARD) ||
-	    unlikely(bio->bi_rw & REQ_WRITE_SAME)) {
+	if (unlikely(bio->bi_op == REQ_OP_DISCARD) ||
+	    unlikely(bio->bi_op == REQ_OP_WRITE_SAME)) {
 		target_bio_nr = dm_bio_get_target_bio_nr(bio);
 		BUG_ON(target_bio_nr >= sc->stripes);
 		return stripe_map_range(sc, bio, target_bio_nr);
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 63a713d..caab74c 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -703,7 +703,7 @@ static void inc_all_io_entry(struct pool *pool, struct bio *bio)
 {
 	struct dm_thin_endio_hook *h;
 
-	if (bio->bi_rw & REQ_DISCARD)
+	if (bio->bi_op == REQ_OP_DISCARD)
 		return;
 
 	h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook));
@@ -866,7 +866,8 @@ static void __inc_remap_and_issue_cell(void *context,
 	struct bio *bio;
 
 	while ((bio = bio_list_pop(&cell->bios))) {
-		if (bio->bi_rw & (REQ_DISCARD | REQ_FLUSH | REQ_FUA))
+		if (bio->bi_rw & (REQ_FLUSH | REQ_FUA) ||
+		    bio->bi_op == REQ_OP_DISCARD)
 			bio_list_add(&info->defer_bios, bio);
 		else {
 			inc_all_io_entry(info->tc->pool, bio);
@@ -1644,7 +1645,8 @@ static void __remap_and_issue_shared_cell(void *context,
 
 	while ((bio = bio_list_pop(&cell->bios))) {
 		if ((bio_data_dir(bio) == WRITE) ||
-		    (bio->bi_rw & (REQ_DISCARD | REQ_FLUSH | REQ_FUA)))
+		    (bio->bi_rw & (REQ_FLUSH | REQ_FUA) ||
+		     bio->bi_op == REQ_OP_DISCARD))
 			bio_list_add(&info->defer_bios, bio);
 		else {
 			struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook));;
@@ -2033,7 +2035,7 @@ static void process_thin_deferred_bios(struct thin_c *tc)
 			break;
 		}
 
-		if (bio->bi_rw & REQ_DISCARD)
+		if (bio->bi_op == REQ_OP_DISCARD)
 			pool->process_discard(tc, bio);
 		else
 			pool->process_bio(tc, bio);
@@ -2120,7 +2122,7 @@ static void process_thin_deferred_cells(struct thin_c *tc)
 				return;
 			}
 
-			if (cell->holder->bi_rw & REQ_DISCARD)
+			if (cell->holder->bi_op == REQ_OP_DISCARD)
 				pool->process_discard_cell(tc, cell);
 			else
 				pool->process_cell(tc, cell);
@@ -2555,7 +2557,8 @@ static int thin_bio_map(struct dm_target *ti, struct bio *bio)
 		return DM_MAPIO_SUBMITTED;
 	}
 
-	if (bio->bi_rw & (REQ_DISCARD | REQ_FLUSH | REQ_FUA)) {
+	if (bio->bi_rw & (REQ_FLUSH | REQ_FUA) ||
+	    bio->bi_op == REQ_OP_DISCARD) {
 		thin_defer_bio_with_throttle(tc, bio);
 		return DM_MAPIO_SUBMITTED;
 	}
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index e03ca09..6b36aad 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -983,7 +983,7 @@ static void clone_endio(struct bio *bio)
 		}
 	}
 
-	if (unlikely(r == -EREMOTEIO && (bio->bi_rw & REQ_WRITE_SAME) &&
+	if (unlikely(r == -EREMOTEIO && (bio->bi_op == REQ_OP_WRITE_SAME) &&
 		     !bdev_get_queue(bio->bi_bdev)->limits.max_write_same_sectors))
 		disable_write_same(md);
 
@@ -1657,9 +1657,9 @@ static int __split_and_process_non_flush(struct clone_info *ci)
 	struct dm_target *ti;
 	unsigned len;
 
-	if (unlikely(bio->bi_rw & REQ_DISCARD))
+	if (unlikely(bio->bi_op == REQ_OP_DISCARD))
 		return __send_discard(ci);
-	else if (unlikely(bio->bi_rw & REQ_WRITE_SAME))
+	else if (unlikely(bio->bi_op == REQ_OP_WRITE_SAME))
 		return __send_write_same(ci);
 
 	ti = dm_table_find_target(ci->map, ci->sector);
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index b7fe7e9..aad82c7 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -252,7 +252,7 @@ static void linear_make_request(struct mddev *mddev, struct bio *bio)
 		split->bi_iter.bi_sector = split->bi_iter.bi_sector -
 			start_sector + data_offset;
 
-		if (unlikely((split->bi_rw & REQ_DISCARD) &&
+		if (unlikely((split->bi_op == REQ_OP_DISCARD) &&
 			 !blk_queue_discard(bdev_get_queue(split->bi_bdev)))) {
 			/* Just ignore it */
 			bio_endio(split);
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index f8e5db0..f38be1f 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -488,7 +488,7 @@ static void raid0_make_request(struct mddev *mddev, struct bio *bio)
 		split->bi_iter.bi_sector = sector + zone->dev_start +
 			tmp_dev->data_offset;
 
-		if (unlikely((split->bi_rw & REQ_DISCARD) &&
+		if (unlikely((split->bi_op == REQ_OP_DISCARD) &&
 			 !blk_queue_discard(bdev_get_queue(split->bi_bdev)))) {
 			/* Just ignore it */
 			bio_endio(split);
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 94e5a63..32e6bf5 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -757,7 +757,7 @@ static void flush_pending_writes(struct r1conf *conf)
 		while (bio) { /* submit pending writes */
 			struct bio *next = bio->bi_next;
 			bio->bi_next = NULL;
-			if (unlikely((bio->bi_rw & REQ_DISCARD) &&
+			if (unlikely((bio->bi_op == REQ_OP_DISCARD) &&
 			    !blk_queue_discard(bdev_get_queue(bio->bi_bdev))))
 				/* Just ignore it */
 				bio_endio(bio);
@@ -1031,7 +1031,7 @@ static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule)
 	while (bio) { /* submit pending writes */
 		struct bio *next = bio->bi_next;
 		bio->bi_next = NULL;
-		if (unlikely((bio->bi_rw & REQ_DISCARD) &&
+		if (unlikely((bio->bi_op == REQ_OP_DISCARD) &&
 		    !blk_queue_discard(bdev_get_queue(bio->bi_bdev))))
 			/* Just ignore it */
 			bio_endio(bio);
@@ -1055,9 +1055,7 @@ static void make_request(struct mddev *mddev, struct bio * bio)
 	const int rw = bio_data_dir(bio);
 	const unsigned long do_sync = (bio->bi_rw & REQ_SYNC);
 	const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA));
-	const unsigned long do_discard = (bio->bi_rw
-					  & (REQ_DISCARD | REQ_SECURE));
-	const unsigned long do_same = (bio->bi_rw & REQ_WRITE_SAME);
+	const unsigned long do_secure = (bio->bi_rw & REQ_SECURE);
 	struct md_rdev *blocked_rdev;
 	struct blk_plug_cb *cb;
 	struct raid1_plug_cb *plug = NULL;
@@ -1166,7 +1164,7 @@ read_again:
 		read_bio->bi_bdev = mirror->rdev->bdev;
 		read_bio->bi_end_io = raid1_end_read_request;
 		read_bio->bi_op = REQ_OP_READ;
-		read_bio->bi_rw = READ | do_sync;
+		read_bio->bi_rw = do_sync;
 		read_bio->bi_private = r1_bio;
 
 		if (max_sectors < r1_bio->sectors) {
@@ -1377,8 +1375,7 @@ read_again:
 		mbio->bi_bdev = conf->mirrors[i].rdev->bdev;
 		mbio->bi_end_io	= raid1_end_write_request;
 		mbio->bi_op = op;
-		mbio->bi_rw =
-			WRITE | do_flush_fua | do_sync | do_discard | do_same;
+		mbio->bi_rw = do_flush_fua | do_sync | do_secure;
 		mbio->bi_private = r1_bio;
 
 		atomic_inc(&r1_bio->remaining);
@@ -2021,7 +2018,7 @@ static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio)
 			continue;
 
 		wbio->bi_op = REQ_OP_WRITE;
-		wbio->bi_rw = WRITE;
+		wbio->bi_rw = 0;
 		wbio->bi_end_io = end_sync_write;
 		atomic_inc(&r1_bio->remaining);
 		md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio));
@@ -2193,7 +2190,7 @@ static int narrow_write_error(struct r1bio *r1_bio, int i)
 		}
 
 		wbio->bi_op = REQ_OP_WRITE;
-		wbio->bi_rw = WRITE;
+		wbio->bi_rw = 0;
 		wbio->bi_iter.bi_sector = r1_bio->sector;
 		wbio->bi_iter.bi_size = r1_bio->sectors << 9;
 
@@ -2335,7 +2332,7 @@ read_more:
 		bio->bi_bdev = rdev->bdev;
 		bio->bi_end_io = raid1_end_read_request;
 		bio->bi_op  = REQ_OP_READ;
-		bio->bi_rw = READ | do_sync;
+		bio->bi_rw = do_sync;
 		bio->bi_private = r1_bio;
 		if (max_sectors < r1_bio->sectors) {
 			/* Drat - have to split this up more */
@@ -2551,7 +2548,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
 				still_degraded = 1;
 		} else if (!test_bit(In_sync, &rdev->flags)) {
 			bio->bi_op = REQ_OP_WRITE;
-			bio->bi_rw = WRITE;
+			bio->bi_rw = 0;
 			bio->bi_end_io = end_sync_write;
 			write_targets ++;
 		} else {
@@ -2579,7 +2576,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
 						disk = i;
 				}
 				bio->bi_op = REQ_OP_READ;
-				bio->bi_rw = READ;
+				bio->bi_rw = 0;
 				bio->bi_end_io = end_sync_read;
 				read_targets++;
 			} else if (!test_bit(WriteErrorSeen, &rdev->flags) &&
@@ -2592,7 +2589,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
 				 * this device alone for this sync request.
 				 */
 				bio->bi_op = REQ_OP_WRITE;
-				bio->bi_rw = WRITE;
+				bio->bi_rw = 0;
 				bio->bi_end_io = end_sync_write;
 				write_targets++;
 			}
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index c7430f9..5d5b9b6 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -865,7 +865,7 @@ static void flush_pending_writes(struct r10conf *conf)
 		while (bio) { /* submit pending writes */
 			struct bio *next = bio->bi_next;
 			bio->bi_next = NULL;
-			if (unlikely((bio->bi_rw & REQ_DISCARD) &&
+			if (unlikely((bio->bi_op == REQ_OP_DISCARD) &&
 			    !blk_queue_discard(bdev_get_queue(bio->bi_bdev))))
 				/* Just ignore it */
 				bio_endio(bio);
@@ -1041,7 +1041,7 @@ static void raid10_unplug(struct blk_plug_cb *cb, bool from_schedule)
 	while (bio) { /* submit pending writes */
 		struct bio *next = bio->bi_next;
 		bio->bi_next = NULL;
-		if (unlikely((bio->bi_rw & REQ_DISCARD) &&
+		if (unlikely((bio->bi_op == REQ_OP_DISCARD) &&
 		    !blk_queue_discard(bdev_get_queue(bio->bi_bdev))))
 			/* Just ignore it */
 			bio_endio(bio);
@@ -1062,9 +1062,7 @@ static void __make_request(struct mddev *mddev, struct bio *bio)
 	const int rw = bio_data_dir(bio);
 	const unsigned long do_sync = (bio->bi_rw & REQ_SYNC);
 	const unsigned long do_fua = (bio->bi_rw & REQ_FUA);
-	const unsigned long do_discard = (bio->bi_rw
-					  & (REQ_DISCARD | REQ_SECURE));
-	const unsigned long do_same = (bio->bi_rw & REQ_WRITE_SAME);
+	const unsigned long do_secure = (bio->bi_rw & REQ_SECURE);
 	unsigned long flags;
 	struct md_rdev *blocked_rdev;
 	struct blk_plug_cb *cb;
@@ -1158,7 +1156,7 @@ read_again:
 		read_bio->bi_bdev = rdev->bdev;
 		read_bio->bi_end_io = raid10_end_read_request;
 		read_bio->bi_op = REQ_OP_READ;
-		read_bio->bi_rw = READ | do_sync;
+		read_bio->bi_rw = do_sync;
 		read_bio->bi_private = r10_bio;
 
 		if (max_sectors < r10_bio->sectors) {
@@ -1366,8 +1364,7 @@ retry_write:
 			mbio->bi_bdev = rdev->bdev;
 			mbio->bi_end_io	= raid10_end_write_request;
 			mbio->bi_op = op;
-			mbio->bi_rw =
-				WRITE | do_sync | do_fua | do_discard | do_same;
+			mbio->bi_rw = do_sync | do_fua | do_secure;
 			mbio->bi_private = r10_bio;
 
 			atomic_inc(&r10_bio->remaining);
@@ -1410,8 +1407,7 @@ retry_write:
 			mbio->bi_bdev = rdev->bdev;
 			mbio->bi_end_io	= raid10_end_write_request;
 			mbio->bi_op = op;
-			mbio->bi_rw =
-				WRITE | do_sync | do_fua | do_discard | do_same;
+			mbio->bi_rw = do_sync | do_fua | do_secure;
 			mbio->bi_private = r10_bio;
 
 			atomic_inc(&r10_bio->remaining);
@@ -1993,7 +1989,7 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio)
 		tbio->bi_vcnt = vcnt;
 		tbio->bi_iter.bi_size = r10_bio->sectors << 9;
 		tbio->bi_op = REQ_OP_WRITE;
-		tbio->bi_rw = WRITE;
+		tbio->bi_rw = 0;
 		tbio->bi_private = r10_bio;
 		tbio->bi_iter.bi_sector = r10_bio->devs[i].addr;
 		tbio->bi_end_io = end_sync_write;
@@ -2550,7 +2546,7 @@ read_more:
 		+ choose_data_offset(r10_bio, rdev);
 	bio->bi_bdev = rdev->bdev;
 	bio->bi_op = REQ_OP_READ;
-	bio->bi_rw = READ | do_sync;
+	bio->bi_rw = do_sync;
 	bio->bi_private = r10_bio;
 	bio->bi_end_io = raid10_end_read_request;
 	if (max_sectors < r10_bio->sectors) {
@@ -3038,7 +3034,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
 				bio->bi_private = r10_bio;
 				bio->bi_end_io = end_sync_read;
 				bio->bi_op = REQ_OP_READ;
-				bio->bi_rw = READ;
+				bio->bi_rw = 0;
 				from_addr = r10_bio->devs[j].addr;
 				bio->bi_iter.bi_sector = from_addr +
 					rdev->data_offset;
@@ -3065,7 +3061,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
 					bio->bi_private = r10_bio;
 					bio->bi_end_io = end_sync_write;
 					bio->bi_op = REQ_OP_WRITE;
-					bio->bi_rw = WRITE;
+					bio->bi_rw = 0;
 					bio->bi_iter.bi_sector = to_addr
 						+ rdev->data_offset;
 					bio->bi_bdev = rdev->bdev;
@@ -3095,7 +3091,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
 				bio->bi_private = r10_bio;
 				bio->bi_end_io = end_sync_write;
 				bio->bi_op = REQ_OP_WRITE;
-				bio->bi_rw = WRITE;
+				bio->bi_rw = 0;
 				bio->bi_iter.bi_sector = to_addr +
 					rdev->data_offset;
 				bio->bi_bdev = rdev->bdev;
@@ -3216,7 +3212,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
 			bio->bi_private = r10_bio;
 			bio->bi_end_io = end_sync_read;
 			bio->bi_op = REQ_OP_READ;
-			bio->bi_rw = READ;
+			bio->bi_rw = 0;
 			bio->bi_iter.bi_sector = sector +
 				conf->mirrors[d].rdev->data_offset;
 			bio->bi_bdev = conf->mirrors[d].rdev->bdev;
@@ -3239,7 +3235,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
 			bio->bi_private = r10_bio;
 			bio->bi_end_io = end_sync_write;
 			bio->bi_op = REQ_OP_WRITE;
-			bio->bi_rw = WRITE;
+			bio->bi_rw = 0;
 			bio->bi_iter.bi_sector = sector +
 				conf->mirrors[d].replacement->data_offset;
 			bio->bi_bdev = conf->mirrors[d].replacement->bdev;
@@ -4323,7 +4319,7 @@ read_more:
 	read_bio->bi_private = r10_bio;
 	read_bio->bi_end_io = end_sync_read;
 	read_bio->bi_op = REQ_OP_READ;
-	read_bio->bi_rw = READ;
+	read_bio->bi_rw = 0;
 	read_bio->bi_flags &= (~0UL << BIO_RESET_BITS);
 	read_bio->bi_error = 0;
 	read_bio->bi_vcnt = 0;
@@ -4358,7 +4354,7 @@ read_more:
 		b->bi_private = r10_bio;
 		b->bi_end_io = end_reshape_write;
 		b->bi_op = REQ_OP_WRITE;
-		b->bi_rw = WRITE;
+		b->bi_rw = 0;
 		b->bi_next = blist;
 		blist = b;
 	}
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 7480155..9b084b2 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -813,7 +813,8 @@ static void stripe_add_to_batch_list(struct r5conf *conf, struct stripe_head *sh
 	dd_idx = 0;
 	while (dd_idx == sh->pd_idx || dd_idx == sh->qd_idx)
 		dd_idx++;
-	if (head->dev[dd_idx].towrite->bi_rw != sh->dev[dd_idx].towrite->bi_rw)
+	if (head->dev[dd_idx].towrite->bi_rw != sh->dev[dd_idx].towrite->bi_rw &&
+	    head->dev[dd_idx].towrite->bi_op != sh->dev[dd_idx].towrite->bi_op)
 		goto unlock_out;
 
 	if (head->batch_head) {
@@ -910,15 +911,8 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
 			} else {
 				op = REQ_OP_WRITE;
 			}
-			if (test_bit(R5_Discard, &sh->dev[i].flags)) {
+			if (test_bit(R5_Discard, &sh->dev[i].flags))
 				op = REQ_OP_DISCARD;
-				/*
-				 * this temporary for compat because drivers
-				 * expected this to be set for discards. It
-				 * will be removed in the next patches.
-				 */
-				op_flags |= REQ_WRITE;
-			}
 		} else if (test_and_clear_bit(R5_Wantread, &sh->dev[i].flags))
 			op = REQ_OP_READ;
 		else if (test_and_clear_bit(R5_WantReplace,
@@ -1011,7 +1005,7 @@ again:
 			bio_reset(bi);
 			bi->bi_bdev = rdev->bdev;
 			bi->bi_op = op;
-			bi->bi_rw = op | op_flags;
+			bi->bi_rw = op_flags;
 			bi->bi_end_io = (op_to_data_dir(op) == WRITE)
 				? raid5_end_write_request
 				: raid5_end_read_request;
@@ -1064,7 +1058,7 @@ again:
 			bio_reset(rbi);
 			rbi->bi_bdev = rrdev->bdev;
 			rbi->bi_op = op;
-			rbi->bi_rw = op | op_flags;
+			rbi->bi_rw = op_flags;
 			BUG_ON(!(op_to_data_dir(op)));
 			rbi->bi_end_io = raid5_end_write_request;
 			rbi->bi_private = sh;
@@ -1640,7 +1634,7 @@ again:
 					set_bit(R5_WantFUA, &dev->flags);
 				if (wbi->bi_rw & REQ_SYNC)
 					set_bit(R5_SyncIO, &dev->flags);
-				if (wbi->bi_rw & REQ_DISCARD)
+				if (wbi->bi_op == REQ_OP_DISCARD)
 					set_bit(R5_Discard, &dev->flags);
 				else {
 					tx = async_copy_data(1, wbi, &dev->page,
@@ -5164,7 +5158,7 @@ static void make_request(struct mddev *mddev, struct bio * bi)
 			return;
 	}
 
-	if (unlikely(bi->bi_rw & REQ_DISCARD)) {
+	if (unlikely(bi->bi_op == REQ_OP_DISCARD)) {
 		make_discard_request(mddev, bi);
 		return;
 	}
diff --git a/drivers/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
index 650ba1c..b55be71 100644
--- a/drivers/scsi/osd/osd_initiator.c
+++ b/drivers/scsi/osd/osd_initiator.c
@@ -730,7 +730,6 @@ static int _osd_req_list_objects(struct osd_request *or,
 	}
 
 	bio->bi_op = REQ_OP_READ;
-	bio->bi_rw &= ~REQ_WRITE;
 	or->in.bio = bio;
 	or->in.total_bytes = bio->bi_iter.bi_size;
 	return 0;
@@ -844,7 +843,6 @@ int osd_req_write_kern(struct osd_request *or,
 		return PTR_ERR(bio);
 
 	bio->bi_op = REQ_OP_WRITE;
-	bio->bi_rw |= REQ_WRITE; /* FIXME: bio_set_dir() */
 	osd_req_write(or, obj, offset, bio, len);
 	return 0;
 }
@@ -962,7 +960,6 @@ static int _osd_req_finalize_cdb_cont(struct osd_request *or, const u8 *cap_key)
 		return PTR_ERR(bio);
 
 	bio->bi_op = REQ_OP_WRITE;
-	bio->bi_rw |= REQ_WRITE;
 
 	/* integrity check the continuation before the bio is linked
 	 * with the other data segments since the continuation
@@ -1084,7 +1081,6 @@ int osd_req_write_sg_kern(struct osd_request *or,
 		return PTR_ERR(bio);
 
 	bio->bi_op = REQ_OP_WRITE;
-	bio->bi_rw |= REQ_WRITE;
 	osd_req_write_sg(or, obj, bio, sglist, numentries);
 
 	return 0;
diff --git a/drivers/staging/lustre/lustre/llite/lloop.c b/drivers/staging/lustre/lustre/llite/lloop.c
index 5f0d80c..9531cd8 100644
--- a/drivers/staging/lustre/lustre/llite/lloop.c
+++ b/drivers/staging/lustre/lustre/llite/lloop.c
@@ -212,9 +212,9 @@ static int do_bio_lustrebacked(struct lloop_device *lo, struct bio *head)
 	io->ci_lockreq = CILR_NEVER;
 
 	LASSERT(head != NULL);
-	rw = head->bi_rw;
+	rw = bio_data_dir(head);
 	for (bio = head; bio != NULL; bio = bio->bi_next) {
-		LASSERT(rw == bio->bi_rw);
+		LASSERT(rw == bio_data_dir(bio));
 
 		offset = (pgoff_t)(bio->bi_iter.bi_sector << 9) + lo->lo_offset;
 		bio_for_each_segment(bvec, bio, iter) {
@@ -305,9 +305,9 @@ static unsigned int loop_get_bio(struct lloop_device *lo, struct bio **req)
 	/* TODO: need to split the bio, too bad. */
 	LASSERT(first->bi_vcnt <= LLOOP_MAX_SEGMENTS);
 
-	rw = first->bi_rw;
+	rw = bio_data_dir(first);
 	bio = &lo->lo_bio;
-	while (*bio && (*bio)->bi_rw == rw) {
+	while (*bio && bio_data_dir(*bio) == rw) {
 		CDEBUG(D_INFO, "bio sector %llu size %u count %u vcnt%u \n",
 		       (unsigned long long)(*bio)->bi_iter.bi_sector,
 		       (*bio)->bi_iter.bi_size,
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index 00a7bda5..2cf915c 100644
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -921,10 +921,8 @@ pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
 				if (!bio)
 					goto fail;
 
-				if (rw) {
+				if (rw)
 					bio->bi_op = REQ_OP_WRITE;
-					bio->bi_rw |= REQ_WRITE;
-				}
 
 				pr_debug("PSCSI: Allocated bio: %p,"
 					" dir: %s nr_vecs: %d\n", bio,
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index ef67c2f..06c7c1d 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -367,7 +367,7 @@ loop_lock:
 			sync_pending = 0;
 		}
 
-		btrfsic_submit_bio(cur->bi_rw, 0, cur);
+		btrfsic_submit_bio(cur->bi_op, cur->bi_rw, cur);
 		num_run++;
 		batch_run++;
 
@@ -5766,7 +5766,7 @@ static void btrfs_end_bio(struct bio *bio)
 			BUG_ON(stripe_index >= bbio->num_stripes);
 			dev = bbio->stripes[stripe_index].dev;
 			if (dev->bdev) {
-				if (bio->bi_rw & WRITE)
+				if (bio_data_dir(bio) == WRITE)
 					btrfs_dev_stat_inc(dev,
 						BTRFS_DEV_STAT_WRITE_ERRS);
 				else
@@ -5848,7 +5848,7 @@ static noinline void btrfs_schedule_bio(struct btrfs_root *root,
 	WARN_ON(bio->bi_next);
 	bio->bi_next = NULL;
 	bio->bi_op = op;
-	bio->bi_rw |= op | op_flags;
+	bio->bi_rw |= op_flags;
 
 	spin_lock(&device->io_lock);
 	if (bio->bi_rw & REQ_SYNC)
diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c
index 7339bef..c40ed74 100644
--- a/fs/exofs/ore.c
+++ b/fs/exofs/ore.c
@@ -879,7 +879,6 @@ static int _write_mirror(struct ore_io_state *ios, int cur_comp)
 				bio = master_dev->bio;
 				/* FIXME: bio_set_dir() */
 				bio->bi_op = REQ_OP_WRITE;
-				bio->bi_rw |= REQ_WRITE;
 			}
 
 			osd_req_write(or, _ios_obj(ios, cur_comp),
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 7796e0b..7cbad7a 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -106,18 +106,23 @@ static inline bool bio_has_data(struct bio *bio)
 {
 	if (bio &&
 	    bio->bi_iter.bi_size &&
-	    !(bio->bi_rw & REQ_DISCARD))
+	    !(bio->bi_op == REQ_OP_DISCARD))
 		return true;
 
 	return false;
 }
 
+static inline bool bio_no_advance_iter(struct bio *bio)
+{
+	return bio->bi_op == REQ_OP_DISCARD || bio->bi_op == REQ_OP_WRITE_SAME;
+}
+
 static inline bool bio_is_rw(struct bio *bio)
 {
 	if (!bio_has_data(bio))
 		return false;
 
-	if (bio->bi_rw & BIO_NO_ADVANCE_ITER_MASK)
+	if (bio_no_advance_iter(bio))
 		return false;
 
 	return true;
@@ -225,7 +230,7 @@ static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter,
 {
 	iter->bi_sector += bytes >> 9;
 
-	if (bio->bi_rw & BIO_NO_ADVANCE_ITER_MASK)
+	if (bio_no_advance_iter(bio))
 		iter->bi_size -= bytes;
 	else
 		bvec_iter_advance(bio->bi_io_vec, iter, bytes);
@@ -253,10 +258,10 @@ static inline unsigned bio_segments(struct bio *bio)
 	 * differently:
 	 */
 
-	if (bio->bi_rw & REQ_DISCARD)
+	if (bio->bi_op == REQ_OP_DISCARD)
 		return 1;
 
-	if (bio->bi_rw & REQ_WRITE_SAME)
+	if (bio->bi_op == REQ_OP_WRITE_SAME)
 		return 1;
 
 	bio_for_each_segment(bv, bio, iter)
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index b974aea..581d353 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -213,13 +213,10 @@ enum rq_flag_bits {
 #define REQ_FAILFAST_MASK \
 	(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
 #define REQ_COMMON_MASK \
-	(REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \
-	 REQ_DISCARD | REQ_WRITE_SAME | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | \
-	 REQ_SECURE | REQ_INTEGRITY)
+	(REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | REQ_NOIDLE | \
+	 REQ_FLUSH | REQ_FUA | REQ_SECURE | REQ_INTEGRITY)
 #define REQ_CLONE_MASK		REQ_COMMON_MASK
 
-#define BIO_NO_ADVANCE_ITER_MASK	(REQ_DISCARD|REQ_WRITE_SAME)
-
 /* This mask is used for both bio and request merge checking */
 #define REQ_NOMERGE_FLAGS \
 	(REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA | REQ_FLUSH_SEQ)
@@ -252,9 +249,9 @@ enum rq_flag_bits {
 
 enum req_op {
 	REQ_OP_READ,
-	REQ_OP_WRITE		= REQ_WRITE,
-	REQ_OP_DISCARD		= REQ_DISCARD,
-	REQ_OP_WRITE_SAME	= REQ_WRITE_SAME,
+	REQ_OP_WRITE,
+	REQ_OP_DISCARD,
+	REQ_OP_WRITE_SAME,
 };
 
 #endif /* __LINUX_BLK_TYPES_H */
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index afc1343..ee25ba4 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -109,7 +109,7 @@ static inline int blk_cmd_buf_len(struct request *rq)
 }
 
 extern void blk_dump_cmd(char *buf, struct request *rq);
-extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes);
+extern void blk_fill_rwbs(char *rwbs, int op, u32 rw, int bytes);
 
 #endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */
 
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 66dd4b91..91f645e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -191,19 +191,19 @@ typedef void (dax_iodone_t)(struct buffer_head *bh_map, int uptodate);
  *			non-volatile media on completion.
  *
  */
-#define RW_MASK			REQ_WRITE
+#define RW_MASK			REQ_OP_WRITE
 #define RWA_MASK		REQ_RAHEAD
 
 #define READ			0
 #define WRITE			RW_MASK
 #define READA			RWA_MASK
 
-#define READ_SYNC		(READ | REQ_SYNC)
-#define WRITE_SYNC		(WRITE | REQ_SYNC | REQ_NOIDLE)
-#define WRITE_ODIRECT		(WRITE | REQ_SYNC)
-#define WRITE_FLUSH		(WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
-#define WRITE_FUA		(WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
-#define WRITE_FLUSH_FUA		(WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
+#define READ_SYNC		REQ_SYNC
+#define WRITE_SYNC		(REQ_SYNC | REQ_NOIDLE)
+#define WRITE_ODIRECT		REQ_SYNC
+#define WRITE_FLUSH		(REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
+#define WRITE_FUA		(REQ_SYNC | REQ_NOIDLE | REQ_FUA)
+#define WRITE_FLUSH_FUA		(REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
 
 /*
  * Attribute flags.  These should be or-ed together to figure out what
@@ -2389,16 +2389,23 @@ extern void make_bad_inode(struct inode *);
 extern int is_bad_inode(struct inode *);
 
 #ifdef CONFIG_BLOCK
-/*
- * return READ, READA, or WRITE
- */
-#define bio_rw(bio)		((bio)->bi_rw & (RW_MASK | RWA_MASK))
 
 /*
  * return data direction, READ or WRITE
  */
 #define bio_data_dir(bio)	((bio)->bi_op == REQ_OP_READ ? READ : WRITE)
 
+/*
+ * return READ, READA, or WRITE
+ */
+static inline int bio_rw(struct bio *bio)
+{
+	if (bio->bi_rw & RWA_MASK)
+		return READA;
+
+	return bio_data_dir(bio);
+}
+
 extern void check_disk_size_change(struct gendisk *disk,
 				   struct block_device *bdev);
 extern int revalidate_disk(struct gendisk *);
diff --git a/include/trace/events/bcache.h b/include/trace/events/bcache.h
index 981acf7..8abe564 100644
--- a/include/trace/events/bcache.h
+++ b/include/trace/events/bcache.h
@@ -27,7 +27,8 @@ DECLARE_EVENT_CLASS(bcache_request,
 		__entry->sector		= bio->bi_iter.bi_sector;
 		__entry->orig_sector	= bio->bi_iter.bi_sector - 16;
 		__entry->nr_sector	= bio->bi_iter.bi_size >> 9;
-		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);
+		blk_fill_rwbs(__entry->rwbs, bio->bi_op, bio->bi_rw,
+			      bio->bi_iter.bi_size);
 	),
 
 	TP_printk("%d,%d %s %llu + %u (from %d,%d @ %llu)",
@@ -101,7 +102,8 @@ DECLARE_EVENT_CLASS(bcache_bio,
 		__entry->dev		= bio->bi_bdev->bd_dev;
 		__entry->sector		= bio->bi_iter.bi_sector;
 		__entry->nr_sector	= bio->bi_iter.bi_size >> 9;
-		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);
+		blk_fill_rwbs(__entry->rwbs, bio->bi_op, bio->bi_rw,
+			      bio->bi_iter.bi_size);
 	),
 
 	TP_printk("%d,%d  %s %llu + %u",
@@ -136,7 +138,8 @@ TRACE_EVENT(bcache_read,
 		__entry->dev		= bio->bi_bdev->bd_dev;
 		__entry->sector		= bio->bi_iter.bi_sector;
 		__entry->nr_sector	= bio->bi_iter.bi_size >> 9;
-		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);
+		blk_fill_rwbs(__entry->rwbs, bio->bi_op, bio->bi_rw,
+			      bio->bi_iter.bi_size);
 		__entry->cache_hit = hit;
 		__entry->bypass = bypass;
 	),
@@ -167,7 +170,8 @@ TRACE_EVENT(bcache_write,
 		__entry->inode		= inode;
 		__entry->sector		= bio->bi_iter.bi_sector;
 		__entry->nr_sector	= bio->bi_iter.bi_size >> 9;
-		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);
+		blk_fill_rwbs(__entry->rwbs, bio->bi_op, bio->bi_rw,
+			      bio->bi_iter.bi_size);
 		__entry->writeback = writeback;
 		__entry->bypass = bypass;
 	),
diff --git a/include/trace/events/block.h b/include/trace/events/block.h
index e8a5eca..4416dcd 100644
--- a/include/trace/events/block.h
+++ b/include/trace/events/block.h
@@ -84,7 +84,8 @@ DECLARE_EVENT_CLASS(block_rq_with_error,
 					0 : blk_rq_sectors(rq);
 		__entry->errors    = rq->errors;
 
-		blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, blk_rq_bytes(rq));
+		blk_fill_rwbs(__entry->rwbs, rq->op, rq->cmd_flags,
+			      blk_rq_bytes(rq));
 		blk_dump_cmd(__get_str(cmd), rq);
 	),
 
@@ -162,7 +163,7 @@ TRACE_EVENT(block_rq_complete,
 		__entry->nr_sector = nr_bytes >> 9;
 		__entry->errors    = rq->errors;
 
-		blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, nr_bytes);
+		blk_fill_rwbs(__entry->rwbs, rq->op, rq->cmd_flags, nr_bytes);
 		blk_dump_cmd(__get_str(cmd), rq);
 	),
 
@@ -198,7 +199,8 @@ DECLARE_EVENT_CLASS(block_rq,
 		__entry->bytes     = (rq->cmd_type == REQ_TYPE_BLOCK_PC) ?
 					blk_rq_bytes(rq) : 0;
 
-		blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, blk_rq_bytes(rq));
+		blk_fill_rwbs(__entry->rwbs, rq->op, rq->cmd_flags,
+			      blk_rq_bytes(rq));
 		blk_dump_cmd(__get_str(cmd), rq);
 		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
 	),
@@ -272,7 +274,8 @@ TRACE_EVENT(block_bio_bounce,
 					  bio->bi_bdev->bd_dev : 0;
 		__entry->sector		= bio->bi_iter.bi_sector;
 		__entry->nr_sector	= bio_sectors(bio);
-		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);
+		blk_fill_rwbs(__entry->rwbs, bio->bi_op, bio->bi_rw,
+			      bio->bi_iter.bi_size);
 		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
 	),
 
@@ -310,7 +313,8 @@ TRACE_EVENT(block_bio_complete,
 		__entry->sector		= bio->bi_iter.bi_sector;
 		__entry->nr_sector	= bio_sectors(bio);
 		__entry->error		= error;
-		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);
+		blk_fill_rwbs(__entry->rwbs, bio->bi_op, bio->bi_rw,
+			      bio->bi_iter.bi_size);
 	),
 
 	TP_printk("%d,%d %s %llu + %u [%d]",
@@ -337,7 +341,8 @@ DECLARE_EVENT_CLASS(block_bio_merge,
 		__entry->dev		= bio->bi_bdev->bd_dev;
 		__entry->sector		= bio->bi_iter.bi_sector;
 		__entry->nr_sector	= bio_sectors(bio);
-		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);
+		blk_fill_rwbs(__entry->rwbs, bio->bi_op, bio->bi_rw,
+			      bio->bi_iter.bi_size);
 		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
 	),
 
@@ -404,7 +409,8 @@ TRACE_EVENT(block_bio_queue,
 		__entry->dev		= bio->bi_bdev->bd_dev;
 		__entry->sector		= bio->bi_iter.bi_sector;
 		__entry->nr_sector	= bio_sectors(bio);
-		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);
+		blk_fill_rwbs(__entry->rwbs, bio->bi_op, bio->bi_rw,
+			      bio->bi_iter.bi_size);
 		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
 	),
 
@@ -432,7 +438,7 @@ DECLARE_EVENT_CLASS(block_get_rq,
 		__entry->dev		= bio ? bio->bi_bdev->bd_dev : 0;
 		__entry->sector		= bio ? bio->bi_iter.bi_sector : 0;
 		__entry->nr_sector	= bio ? bio_sectors(bio) : 0;
-		blk_fill_rwbs(__entry->rwbs,
+		blk_fill_rwbs(__entry->rwbs, bio ? bio->bi_op : 0,
 			      bio ? bio->bi_rw : 0, __entry->nr_sector);
 		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
         ),
@@ -567,7 +573,8 @@ TRACE_EVENT(block_split,
 		__entry->dev		= bio->bi_bdev->bd_dev;
 		__entry->sector		= bio->bi_iter.bi_sector;
 		__entry->new_sector	= new_sector;
-		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);
+		blk_fill_rwbs(__entry->rwbs, bio->bi_op, bio->bi_rw,
+			      bio->bi_iter.bi_size);
 		memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
 	),
 
@@ -610,7 +617,8 @@ TRACE_EVENT(block_bio_remap,
 		__entry->nr_sector	= bio_sectors(bio);
 		__entry->old_dev	= dev;
 		__entry->old_sector	= from;
-		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_iter.bi_size);
+		blk_fill_rwbs(__entry->rwbs, bio->bi_op, bio->bi_rw,
+			      bio->bi_iter.bi_size);
 	),
 
 	TP_printk("%d,%d %s %llu + %u <- (%d,%d) %llu",
@@ -656,7 +664,8 @@ TRACE_EVENT(block_rq_remap,
 		__entry->old_dev	= dev;
 		__entry->old_sector	= from;
 		__entry->nr_bios	= blk_rq_count_bios(rq);
-		blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, blk_rq_bytes(rq));
+		blk_fill_rwbs(__entry->rwbs, rq->op, rq->cmd_flags,
+			      blk_rq_bytes(rq));
 	),
 
 	TP_printk("%d,%d %s %llu + %u <- (%d,%d) %llu %u",
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 90e72a0..36e3862 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -199,7 +199,8 @@ static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ),
  * blk_io_trace structure and places it in a per-cpu subbuffer.
  */
 static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
-		     int rw, u32 what, int error, int pdu_len, void *pdu_data)
+		     int op, int op_flags, u32 what, int error, int pdu_len,
+		     void *pdu_data)
 {
 	struct task_struct *tsk = current;
 	struct ring_buffer_event *event = NULL;
@@ -214,13 +215,14 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
 	if (unlikely(bt->trace_state != Blktrace_running && !blk_tracer))
 		return;
 
-	what |= ddir_act[rw & WRITE];
-	what |= MASK_TC_BIT(rw, SYNC);
-	what |= MASK_TC_BIT(rw, RAHEAD);
-	what |= MASK_TC_BIT(rw, META);
-	what |= MASK_TC_BIT(rw, DISCARD);
-	what |= MASK_TC_BIT(rw, FLUSH);
-	what |= MASK_TC_BIT(rw, FUA);
+	what |= ddir_act[op_to_data_dir(op)];
+	what |= MASK_TC_BIT(op_flags, SYNC);
+	what |= MASK_TC_BIT(op_flags, RAHEAD);
+	what |= MASK_TC_BIT(op_flags, META);
+	what |= MASK_TC_BIT(op_flags, FLUSH);
+	what |= MASK_TC_BIT(op_flags, FUA);
+	if (op == REQ_OP_DISCARD)
+		what |= BLK_TC_ACT(BLK_TC_DISCARD);
 
 	pid = tsk->pid;
 	if (act_log_check(bt, what, sector, pid))
@@ -717,11 +719,11 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
 
 	if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
 		what |= BLK_TC_ACT(BLK_TC_PC);
-		__blk_add_trace(bt, 0, nr_bytes, rq->cmd_flags,
+		__blk_add_trace(bt, 0, nr_bytes, rq->op, rq->cmd_flags,
 				what, rq->errors, rq->cmd_len, rq->cmd);
 	} else  {
 		what |= BLK_TC_ACT(BLK_TC_FS);
-		__blk_add_trace(bt, blk_rq_pos(rq), nr_bytes,
+		__blk_add_trace(bt, blk_rq_pos(rq), nr_bytes, rq->op,
 				rq->cmd_flags, what, rq->errors, 0, NULL);
 	}
 }
@@ -779,7 +781,7 @@ static void blk_add_trace_bio(struct request_queue *q, struct bio *bio,
 		return;
 
 	__blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size,
-			bio->bi_rw, what, error, 0, NULL);
+			bio->bi_op, bio->bi_rw, what, error, 0, NULL);
 }
 
 static void blk_add_trace_bio_bounce(void *ignore,
@@ -827,7 +829,8 @@ static void blk_add_trace_getrq(void *ignore,
 		struct blk_trace *bt = q->blk_trace;
 
 		if (bt)
-			__blk_add_trace(bt, 0, 0, rw, BLK_TA_GETRQ, 0, 0, NULL);
+			__blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_GETRQ, 0, 0,
+					NULL);
 	}
 }
 
@@ -842,7 +845,7 @@ static void blk_add_trace_sleeprq(void *ignore,
 		struct blk_trace *bt = q->blk_trace;
 
 		if (bt)
-			__blk_add_trace(bt, 0, 0, rw, BLK_TA_SLEEPRQ,
+			__blk_add_trace(bt, 0, 0, rw, 0, BLK_TA_SLEEPRQ,
 					0, 0, NULL);
 	}
 }
@@ -852,7 +855,7 @@ static void blk_add_trace_plug(void *ignore, struct request_queue *q)
 	struct blk_trace *bt = q->blk_trace;
 
 	if (bt)
-		__blk_add_trace(bt, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL);
+		__blk_add_trace(bt, 0, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL);
 }
 
 static void blk_add_trace_unplug(void *ignore, struct request_queue *q,
@@ -869,7 +872,7 @@ static void blk_add_trace_unplug(void *ignore, struct request_queue *q,
 		else
 			what = BLK_TA_UNPLUG_TIMER;
 
-		__blk_add_trace(bt, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu);
+		__blk_add_trace(bt, 0, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu);
 	}
 }
 
@@ -883,8 +886,9 @@ static void blk_add_trace_split(void *ignore,
 		__be64 rpdu = cpu_to_be64(pdu);
 
 		__blk_add_trace(bt, bio->bi_iter.bi_sector,
-				bio->bi_iter.bi_size, bio->bi_rw, BLK_TA_SPLIT,
-				bio->bi_error, sizeof(rpdu), &rpdu);
+				bio->bi_iter.bi_size, bio->bi_op, bio->bi_rw,
+				BLK_TA_SPLIT, bio->bi_error, sizeof(rpdu),
+				&rpdu);
 	}
 }
 
@@ -916,7 +920,7 @@ static void blk_add_trace_bio_remap(void *ignore,
 	r.sector_from = cpu_to_be64(from);
 
 	__blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size,
-			bio->bi_rw, BLK_TA_REMAP, bio->bi_error,
+			bio->bi_op, bio->bi_rw, BLK_TA_REMAP, bio->bi_error,
 			sizeof(r), &r);
 }
 
@@ -949,7 +953,7 @@ static void blk_add_trace_rq_remap(void *ignore,
 	r.sector_from = cpu_to_be64(from);
 
 	__blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq),
-			rq_data_dir(rq), BLK_TA_REMAP, !!rq->errors,
+			rq_data_dir(rq), 0, BLK_TA_REMAP, !!rq->errors,
 			sizeof(r), &r);
 }
 
@@ -974,10 +978,10 @@ void blk_add_driver_data(struct request_queue *q,
 		return;
 
 	if (rq->cmd_type == REQ_TYPE_BLOCK_PC)
-		__blk_add_trace(bt, 0, blk_rq_bytes(rq), 0,
+		__blk_add_trace(bt, 0, blk_rq_bytes(rq), 0, 0,
 				BLK_TA_DRV_DATA, rq->errors, len, data);
 	else
-		__blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0,
+		__blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0, 0,
 				BLK_TA_DRV_DATA, rq->errors, len, data);
 }
 EXPORT_SYMBOL_GPL(blk_add_driver_data);
@@ -1778,16 +1782,16 @@ void blk_dump_cmd(char *buf, struct request *rq)
 	}
 }
 
-void blk_fill_rwbs(char *rwbs, u32 rw, int bytes)
+void blk_fill_rwbs(char *rwbs, int op, u32 rw, int bytes)
 {
 	int i = 0;
 
 	if (rw & REQ_FLUSH)
 		rwbs[i++] = 'F';
 
-	if (rw & WRITE)
+	if (op == WRITE)
 		rwbs[i++] = 'W';
-	else if (rw & REQ_DISCARD)
+	else if (op == REQ_OP_DISCARD)
 		rwbs[i++] = 'D';
 	else if (bytes)
 		rwbs[i++] = 'R';
-- 
1.8.3.1

[PATCH 32/32] block: remove __REQ op defs and reduce bi_op/bi_rw sizes

[mchristi]

From: Mike Christie <mchristi@redhat.com>

This patches removes the __REQ/REQ definitions for operations
now defined by REQ_OPs.

There is now no need for bi_rw to be a long, so this makes it a
int. I also moved the priority to its own field, but I guess I could
have just kept this in the bi_rw since there is only 16 bio related
REQ_XYZ flags.

bi_op is also no longer a bitmap, so it only needs to be a u8/char,
so that is changed too.

This is more of a RFC patch, because I still need to update the rest
of the block layer code that was treating bi_rw as a long and I can
also shrink the request->cmd_flags.

I was not sure if or how much or where people wanted to stick things.
There also appears to be room in the bi_flags field. If bi_flags is
only using 13 bits and there are only 16 REQ_XYZs bits related bios,
I could put them all in one variable if we wanted to go wild with trying
to shrink the bio while I am at it..

Signed-off-by: Mike Christie <mchristi@redhat.com>
---
 include/linux/bio.h         | 13 ++-----------
 include/linux/blk_types.h   | 23 ++++++-----------------
 include/trace/events/f2fs.h |  1 -
 3 files changed, 8 insertions(+), 29 deletions(-)

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 7cbad7a..34a20cf 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -44,18 +44,9 @@
 #define BIO_MAX_SIZE		(BIO_MAX_PAGES << PAGE_CACHE_SHIFT)
 #define BIO_MAX_SECTORS		(BIO_MAX_SIZE >> 9)
 
-/*
- * upper 16 bits of bi_rw define the io priority of this bio
- */
-#define BIO_PRIO_SHIFT	(8 * sizeof(unsigned long) - IOPRIO_BITS)
-#define bio_prio(bio)	((bio)->bi_rw >> BIO_PRIO_SHIFT)
+#define bio_prio(bio)		(bio)->bi_ioprio
 #define bio_prio_valid(bio)	ioprio_valid(bio_prio(bio))
-
-#define bio_set_prio(bio, prio)		do {			\
-	WARN_ON(prio >= (1 << IOPRIO_BITS));			\
-	(bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1);		\
-	(bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT);	\
-} while (0)
+#define bio_set_prio(bio, prio)	((bio)->bi_ioprio = prio)
 
 /*
  * various member access, note that bio_data should of course not be used
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 581d353..c32ae3c 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -48,14 +48,9 @@ struct bio {
 	struct block_device	*bi_bdev;
 	unsigned int		bi_flags;	/* status, command, etc */
 	int			bi_error;
-	unsigned long		bi_rw;		/* bottom bits rq_flags_bits
-						 * top bits priority
-						 */
-	/*
-	 * this will be a u8 in the next patches and bi_rw can be shrunk to
-	 * a u32. For compat in these transistional patches op is a int here.
-	 */
-	int			bi_op;		/* REQ_OP */
+	unsigned int		bi_rw;		/* rq_flags_bits */
+	unsigned short		bi_ioprio;
+	u8			bi_op;		/* REQ_OP */
 
 
 	struct bvec_iter	bi_iter;
@@ -151,7 +146,6 @@ struct bio {
  */
 enum rq_flag_bits {
 	/* common flags */
-	__REQ_WRITE,		/* not set, read. set, write */
 	__REQ_FAILFAST_DEV,	/* no driver retries of device errors */
 	__REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
 	__REQ_FAILFAST_DRIVER,	/* no driver retries of driver errors */
@@ -159,9 +153,7 @@ enum rq_flag_bits {
 	__REQ_SYNC,		/* request is sync (sync write or read) */
 	__REQ_META,		/* metadata io request */
 	__REQ_PRIO,		/* boost priority in cfq */
-	__REQ_DISCARD,		/* request to discard sectors */
-	__REQ_SECURE,		/* secure discard (used with __REQ_DISCARD) */
-	__REQ_WRITE_SAME,	/* write same block many times */
+	__REQ_SECURE,		/* secure discard (used with REQ_OP_DISCARD) */
 
 	__REQ_NOIDLE,		/* don't anticipate more IO after this one */
 	__REQ_INTEGRITY,	/* I/O includes block integrity payload */
@@ -198,15 +190,12 @@ enum rq_flag_bits {
 	__REQ_NR_BITS,		/* stops here */
 };
 
-#define REQ_WRITE		(1ULL << __REQ_WRITE)
 #define REQ_FAILFAST_DEV	(1ULL << __REQ_FAILFAST_DEV)
 #define REQ_FAILFAST_TRANSPORT	(1ULL << __REQ_FAILFAST_TRANSPORT)
 #define REQ_FAILFAST_DRIVER	(1ULL << __REQ_FAILFAST_DRIVER)
 #define REQ_SYNC		(1ULL << __REQ_SYNC)
 #define REQ_META		(1ULL << __REQ_META)
 #define REQ_PRIO		(1ULL << __REQ_PRIO)
-#define REQ_DISCARD		(1ULL << __REQ_DISCARD)
-#define REQ_WRITE_SAME		(1ULL << __REQ_WRITE_SAME)
 #define REQ_NOIDLE		(1ULL << __REQ_NOIDLE)
 #define REQ_INTEGRITY		(1ULL << __REQ_INTEGRITY)
 
@@ -250,8 +239,8 @@ enum rq_flag_bits {
 enum req_op {
 	REQ_OP_READ,
 	REQ_OP_WRITE,
-	REQ_OP_DISCARD,
-	REQ_OP_WRITE_SAME,
+	REQ_OP_DISCARD,		/* request to discard sectors */
+	REQ_OP_WRITE_SAME,	/* write same block many times */
 };
 
 #endif /* __LINUX_BLK_TYPES_H */
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 0c7301b..2446a2f 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -31,7 +31,6 @@ TRACE_DEFINE_ENUM(BG_GC);
 TRACE_DEFINE_ENUM(LFS);
 TRACE_DEFINE_ENUM(SSR);
 TRACE_DEFINE_ENUM(__REQ_RAHEAD);
-TRACE_DEFINE_ENUM(__REQ_WRITE);
 TRACE_DEFINE_ENUM(__REQ_SYNC);
 TRACE_DEFINE_ENUM(__REQ_NOIDLE);
 TRACE_DEFINE_ENUM(__REQ_FLUSH);
-- 
1.8.3.1

Re: [dm-devel] [PATCH 19/32] block: add helper to get data dir from op

[Bart Van Assche]

On 11/04/2015 02:08 PM, mchristi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org wrote:
> From: Mike Christie <mchristi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>
> In later patches the op will no longer be a bitmap, so we will
> not have REQ_WRITE set for all non reads like discard, flush,
> and write same. Drivers will still want to treat them as writes
> for accounting reasons, so this patch adds a helper to translate
> a op to a data direction.
>
> Signed-off-by: Mike Christie <mchristi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>   include/linux/blkdev.h | 12 ++++++++++++
>   1 file changed, 12 insertions(+)
>
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 19c2e94..cf5f518 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -586,6 +586,18 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
>
>   #define list_entry_rq(ptr)	list_entry((ptr), struct request, queuelist)
>
> +/*
> + * Non REQ_OP_WRITE requests like discard, write same, etc, are
> + * considered WRITEs.
> + */
> +static inline int op_to_data_dir(int op)
> +{
> +	if (op == REQ_OP_READ)
> +		return READ;
> +	else
> +		return WRITE;
> +}
> +
>   #define rq_data_dir(rq)		((int)((rq)->cmd_flags & 1))
>
>   /*
>

How about introducing two functions - op_is_write() and op_is_read() ? I 
think that approach will result in shorter and easier to read code in 
the contexts where these functions are used.

Bart.

Re: [dm-devel] [PATCH 19/32] block: add helper to get data dir from op

[Bart Van Assche]

On 11/04/2015 02:08 PM, mchristi@redhat.com wrote:
> From: Mike Christie <mchristi@redhat.com>
>
> In later patches the op will no longer be a bitmap, so we will
> not have REQ_WRITE set for all non reads like discard, flush,
> and write same. Drivers will still want to treat them as writes
> for accounting reasons, so this patch adds a helper to translate
> a op to a data direction.
>
> Signed-off-by: Mike Christie <mchristi@redhat.com>
> ---
>   include/linux/blkdev.h | 12 ++++++++++++
>   1 file changed, 12 insertions(+)
>
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 19c2e94..cf5f518 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -586,6 +586,18 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
>
>   #define list_entry_rq(ptr)	list_entry((ptr), struct request, queuelist)
>
> +/*
> + * Non REQ_OP_WRITE requests like discard, write same, etc, are
> + * considered WRITEs.
> + */
> +static inline int op_to_data_dir(int op)
> +{
> +	if (op == REQ_OP_READ)
> +		return READ;
> +	else
> +		return WRITE;
> +}
> +
>   #define rq_data_dir(rq)		((int)((rq)->cmd_flags & 1))
>
>   /*
>

How about introducing two functions - op_is_write() and op_is_read() ? I 
think that approach will result in shorter and easier to read code in 
the contexts where these functions are used.

Bart.

Re: [dm-devel] [PATCH 19/32] block: add helper to get data dir from op

[Bart Van Assche]

On 11/04/2015 02:08 PM, mchristi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org wrote:
> From: Mike Christie <mchristi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>
> In later patches the op will no longer be a bitmap, so we will
> not have REQ_WRITE set for all non reads like discard, flush,
> and write same. Drivers will still want to treat them as writes
> for accounting reasons, so this patch adds a helper to translate
> a op to a data direction.
>
> Signed-off-by: Mike Christie <mchristi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>   include/linux/blkdev.h | 12 ++++++++++++
>   1 file changed, 12 insertions(+)
>
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 19c2e94..cf5f518 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -586,6 +586,18 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
>
>   #define list_entry_rq(ptr)	list_entry((ptr), struct request, queuelist)
>
> +/*
> + * Non REQ_OP_WRITE requests like discard, write same, etc, are
> + * considered WRITEs.
> + */
> +static inline int op_to_data_dir(int op)
> +{
> +	if (op == REQ_OP_READ)
> +		return READ;
> +	else
> +		return WRITE;
> +}
> +
>   #define rq_data_dir(rq)		((int)((rq)->cmd_flags & 1))
>
>   /*
>

How about introducing two functions - op_is_write() and op_is_read() ? I 
think that approach will result in shorter and easier to read code in 
the contexts where these functions are used.

Bart.

Re: [PATCH 02/32] block/fs/mm: prepare submit_bio_wait users for bi_rw split

[Hannes Reinecke]

On 11/04/2015 11:07 PM, mchristi@redhat.com wrote:
> From: Mike Christie <mchristi@redhat.com>
> 
> This patch prepares submit_bio_wait callers for the next
> patches that split bi_rw into a operation and flags field.
> Instead of passing in a bitmap with both the operation and
> flags mixed in, the callers now pass them in seperately.
> 
> Temp issue: When the fs.h read/write types, like WRITE_SYNC or
> WRITE_FUA, are used we still pass in the operation along with the
> flags in the flags argument. When all the code has been converted
> that will be cleaned up. It is left in here for compat and git
> bisect use and to try and make the patches smaller.
> 
> Signed-off-by: Mike Christie <mchristi@redhat.com>
> ---
>  block/bio.c                |  8 ++++----
>  block/blk-flush.c          |  2 +-
>  drivers/md/bcache/debug.c  |  4 ++--
>  drivers/md/md.c            |  2 +-
>  drivers/md/raid1.c         |  2 +-
>  drivers/md/raid10.c        |  2 +-
>  fs/btrfs/check-integrity.c |  8 ++++----
>  fs/btrfs/check-integrity.h |  2 +-
>  fs/btrfs/extent_io.c       |  2 +-
>  fs/btrfs/scrub.c           |  6 +++---
>  fs/ext4/crypto.c           |  2 +-
>  fs/f2fs/segment.c          |  4 ++--
>  fs/hfsplus/hfsplus_fs.h    |  2 +-
>  fs/hfsplus/part_tbl.c      |  5 +++--
>  fs/hfsplus/super.c         |  6 ++++--
>  fs/hfsplus/wrapper.c       | 14 ++++++++------
>  fs/logfs/dev_bdev.c        |  2 +-
>  include/linux/bio.h        |  2 +-
>  kernel/power/swap.c        | 30 ++++++++++++++++++------------
>  19 files changed, 58 insertions(+), 47 deletions(-)
> 
> diff --git a/block/bio.c b/block/bio.c
> index ad3f276..610c704 100644
> --- a/block/bio.c
> +++ b/block/bio.c
> @@ -859,21 +859,21 @@ static void submit_bio_wait_endio(struct bio *bio)
>  
>  /**
>   * submit_bio_wait - submit a bio, and wait until it completes
> - * @rw: whether to %READ or %WRITE, or maybe to %READA (read ahead)
> + * @op: REQ_OP_*
> + * @flags: rq_flag_bits
>   * @bio: The &struct bio which describes the I/O
>   *
>   * Simple wrapper around submit_bio(). Returns 0 on success, or the error from
>   * bio_endio() on failure.
>   */
> -int submit_bio_wait(int rw, struct bio *bio)
> +int submit_bio_wait(int op, int flags, struct bio *bio)
>  {
>  	struct submit_bio_ret ret;
>  
> -	rw |= REQ_SYNC;
>  	init_completion(&ret.event);
>  	bio->bi_private = &ret;
>  	bio->bi_end_io = submit_bio_wait_endio;
> -	submit_bio(rw, bio);
> +	submit_bio(op | flags | REQ_SYNC, bio);
>  	wait_for_completion(&ret.event);
>  
>  	return ret.error;
Personally, I find it a bit odd to have flags starting with
REQ_ to be applied to bios; I would have expected them to be
applicable for requests, not for bios.

Not sure if it's worth the trouble to have the entire flag
set duplicated with BIO_XXX; maybe we should be using a common
set of flags prefixed with something else.

But in the end this is just a style issue, not a technical one.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		               zSeries & Storage
hare@suse.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)

Re: [RESEND RFC PATCH 00/32] separate operations from flags in the bio/request structs

[Bob Peterson]

----- Original Message -----
> This is just a resend of the patchset from earlier today. There was
> a error in the middle of sending the set, so it looks like 10 - 32 got
> dropped.
> 
> There are a couple new block layer commands we are trying to add support
> for in the near term:
> 
> compare and write
> http://www.spinics.net/lists/target-devel/msg07826.html
> 
> copy offload/extended copy/xcopy
> https://www.redhat.com/archives/dm-devel/2014-July/msg00070.html
> 
> The problem is if we contine to add more commands we will have to one day
> extend the cmd_flags/bi_rw fields again. To prevent that, this patchset
> separates the operation (REQ_WRITE, REQ_DISCARD, REQ_WRITE_SAME, etc) from
> the flags (REQ_SYNC, REQ_QUIET, etc) in the bio and request structs. In the
> end of this set, we will have two fields bio->bi_op/request->op and
> bio->bi_rw/request->cmd_flags.
> 
> The patches were made against Jens's linux-block tree's for-linus branch:
> https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git/log/?h=for-linus
> (last commit a22c4d7e34402ccdf3414f64c50365436eba7b93).
> 
> I have done some basic testing for a lot of the drivers and filesystems,
> but I wanted to get comments before trying to track down more hardware/
> systems for testing.
> 
> 
> Known issues:
> - REQ_FLUSH is still a flag, but should probably be a operation.
>  For lower level drivers like SCSI where we only get a flush, it makes
> more sense to be a operation. However, upper layers like filesystems
> can send down flushes with writes, so it is more of a flag for them.
> I am still working on this.
> 
> - There is a regression with the dm flakey target. It currently
> cannot corrupt the operation values.
> 
> - The patchset is a little awkward. It touches so much code,
> but I wanted to maintain git bisectibility, so there is lots of compat code
> left around until the last patches where everyting is cleaned up.

Hi Mike,

The GFS2 patches in patches 11, 14, 16 and 23 all look correct.
You can add my:
Reviewed-by: Bob Peterson <rpeterso@redhat.com>
to those, but I have not reviewed the non-GFS2 bits.

Regards,

Bob Peterson
Red Hat File Systems

Re: [dm-devel] [PATCH 19/32] block: add helper to get data dir from op

[Mike Christie]

On 11/04/2015 04:44 PM, Bart Van Assche wrote:
> On 11/04/2015 02:08 PM, mchristi@redhat.com wrote:
>> From: Mike Christie <mchristi@redhat.com>
>>
>> In later patches the op will no longer be a bitmap, so we will
>> not have REQ_WRITE set for all non reads like discard, flush,
>> and write same. Drivers will still want to treat them as writes
>> for accounting reasons, so this patch adds a helper to translate
>> a op to a data direction.
>>
>> Signed-off-by: Mike Christie <mchristi@redhat.com>
>> ---
>>   include/linux/blkdev.h | 12 ++++++++++++
>>   1 file changed, 12 insertions(+)
>>
>> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
>> index 19c2e94..cf5f518 100644
>> --- a/include/linux/blkdev.h
>> +++ b/include/linux/blkdev.h
>> @@ -586,6 +586,18 @@ static inline void queue_flag_clear(unsigned int
>> flag, struct request_queue *q)
>>
>>   #define list_entry_rq(ptr)    list_entry((ptr), struct request,
>> queuelist)
>>
>> +/*
>> + * Non REQ_OP_WRITE requests like discard, write same, etc, are
>> + * considered WRITEs.
>> + */
>> +static inline int op_to_data_dir(int op)
>> +{
>> +    if (op == REQ_OP_READ)
>> +        return READ;
>> +    else
>> +        return WRITE;
>> +}
>> +
>>   #define rq_data_dir(rq)        ((int)((rq)->cmd_flags & 1))
>>
>>   /*
>>
> 
> How about introducing two functions - op_is_write() and op_is_read() ? I
> think that approach will result in shorter and easier to read code in
> the contexts where these functions are used.
> 

I can do that. You are right in how they are used. I just did the above,
to follow the other *_data_dir calls.

Re: [RESEND RFC PATCH 00/32] separate operations from flags in the bio/request structs

[Christoph Hellwig]

On Wed, Nov 04, 2015 at 04:07:57PM -0600, mchristi@redhat.com wrote:
> Known issues:
> - REQ_FLUSH is still a flag, but should probably be a operation.
>  For lower level drivers like SCSI where we only get a flush, it makes
> more sense to be a operation. However, upper layers like filesystems
> can send down flushes with writes, so it is more of a flag for them.
> I am still working on this.

Actually it should be both.  REQ_OP_FLUSH for a real flush operation,
and a REQ_PREFLUSH bio flag that the request layer will sequence into
an actual write an a flush operation.

Re: [PATCH 06/32] xen blkback: prepare for bi_rw split

[Christoph Hellwig]

A little offtopic for this patch, but can some explain this whole
mess about bios in Xen blkfront?  We can happily do partial completions
at the request later.

Also since the blk-mq conversion the call to blk_end_request_all is
completely broken, so it doesn't look like this code path is exactly
well tested.

Re: [PATCH 06/32] xen blkback: prepare for bi_rw split

[Christoph Hellwig]

A little offtopic for this patch, but can some explain this whole
mess about bios in Xen blkfront?  We can happily do partial completions
at the request later.

Also since the blk-mq conversion the call to blk_end_request_all is
completely broken, so it doesn't look like this code path is exactly
well tested.

Re: [PATCH 06/32] xen blkback: prepare for bi_rw split

[Christoph Hellwig]

A little offtopic for this patch, but can some explain this whole
mess about bios in Xen blkfront?  We can happily do partial completions
at the request later.

Also since the blk-mq conversion the call to blk_end_request_all is
completely broken, so it doesn't look like this code path is exactly
well tested.

Re: [dm-devel] [PATCH 19/32] block: add helper to get data dir from op

[Christoph Hellwig]

On Thu, Nov 05, 2015 at 11:34:07AM -0600, Mike Christie wrote:
> I can do that. You are right in how they are used. I just did the above,
> to follow the other *_data_dir calls.

I think the *_data_dir calls are horrible interfaces.  But your series
already is huge, so if it makes your life easier I'd say keep it as-is
for now.  But in the long run we should have the interfaces that Bart
suggested, and one that gives you a dma_data_direction from a request,
as that's what a lot of the driver ultimatively want.

Re: [dm-devel] [PATCH 19/32] block: add helper to get data dir from op

[Christoph Hellwig]

On Thu, Nov 05, 2015 at 11:34:07AM -0600, Mike Christie wrote:
> I can do that. You are right in how they are used. I just did the above,
> to follow the other *_data_dir calls.

I think the *_data_dir calls are horrible interfaces.  But your series
already is huge, so if it makes your life easier I'd say keep it as-is
for now.  But in the long run we should have the interfaces that Bart
suggested, and one that gives you a dma_data_direction from a request,
as that's what a lot of the driver ultimatively want.

Re: [PATCH 32/32] block: remove __REQ op defs and reduce bi_op/bi_rw sizes

[Christoph Hellwig]

I love this series!

Also I think it's very good that we finally split the ioprio out to it's
own field.

Thanks a lot for doing this work.

> I was not sure if or how much or where people wanted to stick things.
> There also appears to be room in the bi_flags field. If bi_flags is
> only using 13 bits and there are only 16 REQ_XYZs bits related bios,
> I could put them all in one variable if we wanted to go wild with trying
> to shrink the bio while I am at it..

This sounds interesting, but I'd rather do it as a separate project
later.

Re: [PATCH 32/32] block: remove __REQ op defs and reduce bi_op/bi_rw sizes

[Christoph Hellwig]

I love this series!

Also I think it's very good that we finally split the ioprio out to it's
own field.

Thanks a lot for doing this work.

> I was not sure if or how much or where people wanted to stick things.
> There also appears to be room in the bi_flags field. If bi_flags is
> only using 13 bits and there are only 16 REQ_XYZs bits related bios,
> I could put them all in one variable if we wanted to go wild with trying
> to shrink the bio while I am at it..

This sounds interesting, but I'd rather do it as a separate project
later.

Re: [PATCH 06/32] xen blkback: prepare for bi_rw split

[Konrad Rzeszutek Wilk]

On Sat, Nov 07, 2015 at 02:17:13AM -0800, Christoph Hellwig wrote:
> A little offtopic for this patch, but can some explain this whole
> mess about bios in Xen blkfront?  We can happily do partial completions
> at the request later.

Not sure I follow. There are a couple of patches that are touching
Xen block code right now - the multi-queue, the ones in xen-tip
(which look to have be merged on Wednesday) and this one.

And oddly enough I never got copied on this original patch.
> 
> Also since the blk-mq conversion the call to blk_end_request_all is
> completely broken, so it doesn't look like this code path is exactly
> well tested.

Re: [PATCH 06/32] xen blkback: prepare for bi_rw split

[Konrad Rzeszutek Wilk]

On Sat, Nov 07, 2015 at 02:17:13AM -0800, Christoph Hellwig wrote:
> A little offtopic for this patch, but can some explain this whole
> mess about bios in Xen blkfront?  We can happily do partial completions
> at the request later.

Not sure I follow. There are a couple of patches that are touching
Xen block code right now - the multi-queue, the ones in xen-tip
(which look to have be merged on Wednesday) and this one.

And oddly enough I never got copied on this original patch.
> 
> Also since the blk-mq conversion the call to blk_end_request_all is
> completely broken, so it doesn't look like this code path is exactly
> well tested.

Re: [PATCH 06/32] xen blkback: prepare for bi_rw split

[Bob Liu]

On 11/07/2015 06:17 PM, Christoph Hellwig wrote:
> A little offtopic for this patch, but can some explain this whole
> mess about bios in Xen blkfront?  We can happily do partial completions
> at the request later.
> 
> Also since the blk-mq conversion the call to blk_end_request_all is

This will be fixed after my next blk-mq patch series which also modified the recover path.

> completely broken, so it doesn't look like this code path is exactly
> well tested.
>

Thanks,
-Bob

Re: [PATCH 06/32] xen blkback: prepare for bi_rw split

[Bob Liu]

On 11/07/2015 06:17 PM, Christoph Hellwig wrote:
> A little offtopic for this patch, but can some explain this whole
> mess about bios in Xen blkfront?  We can happily do partial completions
> at the request later.
> 
> Also since the blk-mq conversion the call to blk_end_request_all is

This will be fixed after my next blk-mq patch series which also modified the recover path.

> completely broken, so it doesn't look like this code path is exactly
> well tested.
>

Thanks,
-Bob