[PATCH 37/42] block, fs, drivers: do use bi_rw/cmd_flags for REQ_OPs.

[mchristi@redhat.com]

From: Mike Christie <mchristi@redhat.com>

We no longer use the bio->bi_rw and request->cmd_flags field for REQ_OPs:
REQ_WRITE, REQ_DISCARD, REQ_WRITE_SAME, so this patch stops checking
for them in bi_rw/cmd_flags and also removes the related compat code.

v2:

1. Remove compat code in __get_request.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
---
 block/bio.c                                 |  6 ++---
 block/blk-core.c                            | 34 ++++++++---------------------
 block/blk-merge.c                           | 14 ++++++------
 block/blk-mq.c                              |  3 +--
 drivers/ata/libata-scsi.c                   |  2 +-
 drivers/block/brd.c                         |  2 +-
 drivers/block/drbd/drbd_main.c              | 15 +++++++------
 drivers/block/drbd/drbd_worker.c            |  4 ++--
 drivers/block/loop.c                        |  6 ++---
 drivers/block/rbd.c                         |  2 +-
 drivers/block/rsxx/dma.c                    |  2 +-
 drivers/block/umem.c                        |  2 +-
 drivers/block/zram/zram_drv.c               |  2 +-
 drivers/ide/ide-floppy.c                    |  2 +-
 drivers/lightnvm/rrpc.c                     |  2 +-
 drivers/md/bcache/request.c                 | 10 ++++-----
 drivers/md/dm-cache-target.c                | 10 +++++----
 drivers/md/dm-crypt.c                       |  2 +-
 drivers/md/dm-log-writes.c                  |  2 +-
 drivers/md/dm-raid1.c                       |  8 +++----
 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/scsi/osd/osd_initiator.c            |  4 ++--
 drivers/staging/lustre/lustre/llite/lloop.c |  6 ++---
 include/linux/bio.h                         | 15 ++++++++-----
 include/linux/fs.h                          | 25 +++++++--------------
 30 files changed, 99 insertions(+), 114 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index 921de2e..bec5b54 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -675,10 +675,10 @@ 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;
 	}
@@ -1797,7 +1797,7 @@ 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 e2f7b0a..ccf2056 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1151,8 +1151,7 @@ static struct request *__get_request(struct request_list *rl, int op,
 
 	blk_rq_init(q, rq);
 	blk_rq_set_rl(rq, rl);
-	/* tmp compat - allow users to check either one for the op */
-	rq->cmd_flags = op | op_flags | REQ_ALLOCED;
+	rq->cmd_flags = op_flags | REQ_ALLOCED;
 	rq->op = op;
 
 	/* init elvpriv */
@@ -1705,8 +1704,7 @@ void init_request_from_bio(struct request *req, struct bio *bio)
 {
 	req->cmd_type = REQ_TYPE_FS;
 
-	/* tmp compat. Allow users to set bi_op or bi_rw */
-	req->cmd_flags |= (bio->bi_rw | bio->bi_op) & REQ_COMMON_MASK;
+	req->cmd_flags |= bio->bi_rw & REQ_COMMON_MASK;
 	if (bio->bi_rw & REQ_RAHEAD)
 		req->cmd_flags |= REQ_FAILFAST_MASK;
 
@@ -1856,9 +1854,9 @@ static void handle_bad_sector(struct bio *bio)
 	char b[BDEVNAME_SIZE];
 
 	printk(KERN_INFO "attempt to access beyond end of device\n");
-	printk(KERN_INFO "%s: rw=%ld, want=%Lu, limit=%Lu\n",
+	printk(KERN_INFO "%s: rw=%d,%ld, want=%Lu, limit=%Lu\n",
 			bdevname(bio->bi_bdev, b),
-			bio->bi_rw,
+			bio->bi_op, bio->bi_rw,
 			(unsigned long long)bio_end_sector(bio),
 			(long long)(i_size_read(bio->bi_bdev->bd_inode) >> 9));
 }
@@ -1980,14 +1978,14 @@ 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;
 	}
@@ -2041,12 +2039,6 @@ blk_qc_t generic_make_request(struct bio *bio)
 	struct bio_list bio_list_on_stack;
 	blk_qc_t ret = BLK_QC_T_NONE;
 
-	/* tmp compat. Allow users to set either one or both.
-	 * This will be removed when we have converted
-	 * everyone in the next patches.
-	 */
-	bio->bi_rw |= bio->bi_op;
-
 	if (!generic_make_request_checks(bio))
 		goto out;
 
@@ -2116,12 +2108,6 @@ EXPORT_SYMBOL(generic_make_request);
  */
 blk_qc_t submit_bio(struct bio *bio)
 {
-	/* tmp compat. Allow users to set either one or both.
-	 * This will be removed when we have converted
-	 * everyone in the next patches.
-	 */
-	bio->bi_rw |= bio->bi_op;
-
 	/*
 	 * If it's a regular read/write or a barrier with data attached,
 	 * go through the normal accounting stuff before submission.
@@ -2129,12 +2115,12 @@ blk_qc_t submit_bio(struct bio *bio)
 	if (bio_has_data(bio)) {
 		unsigned int count;
 
-		if (unlikely(bio->bi_rw & REQ_WRITE_SAME))
+		if (unlikely(bio->bi_op == REQ_OP_WRITE_SAME))
 			count = bdev_logical_block_size(bio->bi_bdev) >> 9;
 		else
 			count = bio_sectors(bio);
 
-		if (bio->bi_rw & WRITE) {
+		if (op_is_write(bio->bi_op)) {
 			count_vm_events(PGPGOUT, count);
 		} else {
 			task_io_account_read(bio->bi_iter.bi_size);
@@ -2145,7 +2131,7 @@ blk_qc_t submit_bio(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),
-				(bio->bi_rw & WRITE) ? "WRITE" : "READ",
+				op_is_write(bio->bi_op) ? "WRITE" : "READ",
 				(unsigned long long)bio->bi_iter.bi_sector,
 				bdevname(bio->bi_bdev, b),
 				count);
@@ -2995,8 +2981,6 @@ EXPORT_SYMBOL_GPL(__blk_end_request_err);
 void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
 		     struct bio *bio)
 {
-	/* tmp compat. Allow users to set bi_op or bi_rw */
-	rq->cmd_flags |= bio_data_dir(bio);
 	rq->op = bio->bi_op;
 
 	if (bio_has_data(bio))
diff --git a/block/blk-merge.c b/block/blk-merge.c
index c02371f..31dc0c0 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -172,9 +172,9 @@ void blk_queue_split(struct request_queue *q, struct bio **bio,
 	struct bio *split, *res;
 	unsigned nsegs;
 
-	if ((*bio)->bi_rw & REQ_DISCARD)
+	if ((*bio)->bi_op == REQ_OP_DISCARD)
 		split = blk_bio_discard_split(q, *bio, bs, &nsegs);
-	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, &nsegs);
 	else
 		split = blk_bio_segment_split(q, *bio, q->bio_split, &nsegs);
@@ -213,10 +213,10 @@ 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;
@@ -385,7 +385,7 @@ 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
@@ -400,7 +400,7 @@ 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);
@@ -439,7 +439,7 @@ 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 (op_is_write(rq->op))
 			memset(q->dma_drain_buffer, 0, q->dma_drain_size);
 
 		sg_unmark_end(sg);
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 64d61be..840f57a 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -170,8 +170,7 @@ 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;
-	/* tmp compat - allow users to check either one for the 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);
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index c7d0fc1..c6086c1 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1184,7 +1184,7 @@ 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) || op_is_write(rq->op))
 		return 0;
 
 	return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 51a071e..eaefb8c 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -339,7 +339,7 @@ static blk_qc_t 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)) {
 		if (sector & ((PAGE_SIZE >> SECTOR_SHIFT) - 1) ||
 		    bio->bi_iter.bi_size & ~PAGE_MASK)
 			goto io_error;
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 30c93d6..ace906f 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -1603,15 +1603,16 @@ 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
@@ -1636,7 +1637,7 @@ 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_worker.c b/drivers/block/drbd/drbd_worker.c
index 2a04b43..0949961 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -174,7 +174,7 @@ 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",
@@ -248,7 +248,7 @@ 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;
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 0e80c9b..f1f7a25 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -447,7 +447,7 @@ static int lo_req_flush(struct loop_device *lo, struct request *rq)
 
 static inline void handle_partial_read(struct loop_cmd *cmd, long bytes)
 {
-	if (bytes < 0 || (cmd->rq->cmd_flags & REQ_WRITE))
+	if (bytes < 0 || op_is_write(cmd->rq->op))
 		return;
 
 	if (unlikely(bytes < blk_rq_bytes(cmd->rq))) {
@@ -535,7 +535,7 @@ 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 (op_is_write(rq->op)) {
 		if (rq->cmd_flags & REQ_FLUSH)
 			ret = lo_req_flush(lo, rq);
 		else if (rq->op == REQ_OP_DISCARD)
@@ -1666,7 +1666,7 @@ 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 = op_is_write(cmd->rq->op);
 	struct loop_device *lo = cmd->rq->q->queuedata;
 	int ret = 0;
 
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index e8935af..4c0c057 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -3373,7 +3373,7 @@ static void rbd_queue_workfn(struct work_struct *work)
 
 	if (rq->op == REQ_OP_DISCARD)
 		op_type = OBJ_OP_DISCARD;
-	else if (rq->cmd_flags & REQ_WRITE)
+	else if (rq->op == REQ_OP_WRITE)
 		op_type = OBJ_OP_WRITE;
 	else
 		op_type = OBJ_OP_READ;
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/umem.c b/drivers/block/umem.c
index 7939b9f..a24ccbc 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 (op_is_write(bio->bi_op) &&
 			   le32_to_cpu(desc->local_addr) >> 9 ==
 				card->init_size) {
 			card->init_size += le32_to_cpu(desc->transfer_size) >> 9;
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 370c2f7..3c7ef31 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/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/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
index fd9b629..9b1a74e 100644
--- a/drivers/lightnvm/rrpc.c
+++ b/drivers/lightnvm/rrpc.c
@@ -911,7 +911,7 @@ static blk_qc_t rrpc_make_rq(struct request_queue *q, struct bio *bio)
 	struct nvm_rq *rqd;
 	int err;
 
-	if (bio->bi_rw & REQ_DISCARD) {
+	if (bio->bi_op == REQ_OP_DISCARD) {
 		rrpc_discard(rrpc, bio);
 		return BLK_QC_T_NONE;
 	}
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index cd6837c..be8cd63f 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -378,7 +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 ||
@@ -899,7 +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,
@@ -913,7 +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 +993,7 @@ static blk_qc_t cached_dev_make_request(struct request_queue *q,
 				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
@@ -1104,7 +1104,7 @@ static blk_qc_t flash_dev_make_request(struct request_queue *q,
 					&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/dm-cache-target.c b/drivers/md/dm-cache-target.c
index ee0510f..838f784 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -788,7 +788,8 @@ 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;
 	}
@@ -851,7 +852,7 @@ 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)
@@ -1067,7 +1068,8 @@ 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_op == REQ_OP_DISCARD ||
+	       bio->bi_rw & (REQ_FLUSH | REQ_FUA);
 }
 
 static void __cell_defer(struct cache *cache, struct dm_bio_prison_cell *cell)
@@ -1980,7 +1982,7 @@ 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 70fbf11..3a4ddad 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1916,7 +1916,7 @@ 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-log-writes.c b/drivers/md/dm-log-writes.c
index 27630c5..e991405 100644
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -557,7 +557,7 @@ 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 8a86bc3..c4d23da 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;
@@ -665,7 +665,7 @@ static void do_write(struct mirror_set *ms, struct bio *bio)
 		.client = ms->io_client,
 	};
 
-	if (bio->bi_rw & 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 74cb7b9..ce4af57 100644
--- a/drivers/md/dm-region-hash.c
+++ b/drivers/md/dm-region-hash.c
@@ -403,7 +403,7 @@ 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. */
@@ -526,7 +526,7 @@ 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 6049078..85688b7 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -715,7 +715,7 @@ 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));
@@ -878,7 +878,8 @@ 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);
@@ -1656,7 +1657,8 @@ 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));;
@@ -2045,7 +2047,7 @@ 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);
@@ -2132,7 +2134,7 @@ 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);
@@ -2570,7 +2572,8 @@ 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 13c869c..4ee7d5c 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1053,7 +1053,7 @@ 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);
 
@@ -1748,9 +1748,9 @@ static int __split_and_process_non_flush(struct clone_info *ci)
 	unsigned len;
 	int r;
 
-	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 f63dbb6..58ff1ff 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -489,7 +489,7 @@ 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/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
index edcba56..f6572e6 100644
--- a/drivers/scsi/osd/osd_initiator.c
+++ b/drivers/scsi/osd/osd_initiator.c
@@ -824,7 +824,7 @@ 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(!op_is_write(bio->bi_op));
 	or->out.bio = bio;
 	or->out.total_bytes = len;
 }
@@ -875,7 +875,7 @@ 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(op_is_write(bio->bi_op));
 	or->in.bio = bio;
 	or->in.total_bytes = len;
 }
diff --git a/drivers/staging/lustre/lustre/llite/lloop.c b/drivers/staging/lustre/lustre/llite/lloop.c
index f169c0d..e602389 100644
--- a/drivers/staging/lustre/lustre/llite/lloop.c
+++ b/drivers/staging/lustre/lustre/llite/lloop.c
@@ -211,9 +211,9 @@ static int do_bio_lustrebacked(struct lloop_device *lo, struct bio *head)
 		return io->ci_result;
 	io->ci_lockreq = CILR_NEVER;
 
-	rw = head->bi_rw;
+	rw = bio_data_dir(head);
 	for (bio = head; bio ; 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) {
@@ -304,7 +304,7 @@ 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) {
 		CDEBUG(D_INFO, "bio sector %llu size %u count %u vcnt%u\n",
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 4724810..9e7b18b 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/fs.h b/include/linux/fs.h
index f3f2f66..9becf20 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2466,33 +2466,24 @@ static inline bool op_is_write(int op)
 }
 
 /*
- * return READ, READA, or WRITE
+ * return data direction, READ or WRITE
  */
-static inline int bio_rw(struct bio *bio)
+static inline int bio_data_dir(struct bio *bio)
 {
-	/*
-	 * tmp cpmpat. Allow users to set either op or rw, until
-	 * all code is converted in the next patches.
-	 */
 	if (op_is_write(bio->bi_op))
 		return WRITE;
-
-	return bio->bi_rw & (RW_MASK | RWA_MASK);
+	return READ;
 }
 
 /*
- * return data direction, READ or WRITE
+ * return READ, READA, or WRITE
  */
-static inline int bio_data_dir(struct bio *bio)
+static inline int bio_rw(struct bio *bio)
 {
-	/*
-	 * tmp cpmpat. Allow users to set either op or rw, until
-	 * all code is converted in the next patches.
-	 */
-	if (op_is_write(bio->bi_op))
-		return WRITE;
+	if (bio->bi_rw & RWA_MASK)
+		return READA;
 
-	return bio->bi_rw & 1;
+	return bio_data_dir(bio);
 }
 
 extern void check_disk_size_change(struct gendisk *disk,
-- 
2.7.2