[PATCH v2 47/63] fs/buffer: Combine two submit_bh() and ll_rw_block() arguments

[Bart Van Assche <bvanassche@acm.org>]

Both submit_bh() and ll_rw_block() accept a request operation type and
request flags as their first two arguments. Micro-optimize these two
functions by combining these first two arguments into a single argument.
This patch does not change the behavior of any of the modified code.

Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Song Liu <song@kernel.org>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/md/md-bitmap.c      |  4 +--
 fs/buffer.c                 | 53 +++++++++++++++++++------------------
 fs/ext4/fast_commit.c       |  2 +-
 fs/ext4/mmp.c               |  2 +-
 fs/ext4/super.c             |  6 ++---
 fs/gfs2/bmap.c              |  5 ++--
 fs/gfs2/dir.c               |  5 ++--
 fs/gfs2/meta_io.c           |  9 +++----
 fs/gfs2/quota.c             |  2 +-
 fs/isofs/compress.c         |  2 +-
 fs/jbd2/commit.c            |  8 +++---
 fs/jbd2/journal.c           |  4 +--
 fs/jbd2/recovery.c          |  4 +--
 fs/nilfs2/btnode.c          |  2 +-
 fs/nilfs2/gcinode.c         |  2 +-
 fs/nilfs2/mdt.c             |  2 +-
 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/ntfs3/file.c             |  2 +-
 fs/ntfs3/inode.c            |  2 +-
 fs/ocfs2/aops.c             |  2 +-
 fs/ocfs2/buffer_head_io.c   |  8 +++---
 fs/ocfs2/super.c            |  2 +-
 fs/reiserfs/inode.c         |  4 +--
 fs/reiserfs/journal.c       | 12 ++++-----
 fs/reiserfs/stree.c         |  4 +--
 fs/reiserfs/super.c         |  2 +-
 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 |  4 +--
 35 files changed, 88 insertions(+), 90 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 0a21b8317103..bf6dffadbe6f 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -302,7 +302,7 @@ 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(REQ_OP_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(REQ_OP_READ, 0, bh);
+			submit_bh(REQ_OP_READ, bh);
 		}
 		blk_cur++;
 		bh = bh->b_this_page;
diff --git a/fs/buffer.c b/fs/buffer.c
index 4a00b61f35ec..af53569930bb 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -52,8 +52,8 @@
 #include "internal.h"
 
 static int fsync_buffers_list(spinlock_t *lock, struct list_head *list);
-static int submit_bh_wbc(enum req_op op, blk_opf_t op_flags,
-			 struct buffer_head *bh, struct writeback_control *wbc);
+static int submit_bh_wbc(blk_opf_t opf, struct buffer_head *bh,
+			 struct writeback_control *wbc);
 
 #define BH_ENTRY(list) list_entry((list), struct buffer_head, b_assoc_buffers)
 
@@ -562,7 +562,7 @@ 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(REQ_OP_WRITE, 0, 1, &bh);
+			ll_rw_block(REQ_OP_WRITE, 1, &bh);
 		put_bh(bh);
 	}
 }
@@ -1174,7 +1174,7 @@ static struct buffer_head *__bread_slow(struct buffer_head *bh)
 	} else {
 		get_bh(bh);
 		bh->b_end_io = end_buffer_read_sync;
-		submit_bh(REQ_OP_READ, 0, bh);
+		submit_bh(REQ_OP_READ, bh);
 		wait_on_buffer(bh);
 		if (buffer_uptodate(bh))
 			return bh;
@@ -1342,7 +1342,7 @@ 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(REQ_OP_READ, REQ_RAHEAD, 1, &bh);
+		ll_rw_block(REQ_OP_READ | REQ_RAHEAD, 1, &bh);
 		brelse(bh);
 	}
 }
@@ -1353,7 +1353,7 @@ void __breadahead_gfp(struct block_device *bdev, sector_t block, unsigned size,
 {
 	struct buffer_head *bh = __getblk_gfp(bdev, block, size, gfp);
 	if (likely(bh)) {
-		ll_rw_block(REQ_OP_READ, REQ_RAHEAD, 1, &bh);
+		ll_rw_block(REQ_OP_READ | REQ_RAHEAD, 1, &bh);
 		brelse(bh);
 	}
 }
@@ -1804,7 +1804,7 @@ 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(REQ_OP_WRITE, write_flags, bh, wbc);
+			submit_bh_wbc(REQ_OP_WRITE | write_flags, bh, wbc);
 			nr_underway++;
 		}
 		bh = next;
@@ -1858,7 +1858,7 @@ int __block_write_full_page(struct inode *inode, struct page *page,
 		struct buffer_head *next = bh->b_this_page;
 		if (buffer_async_write(bh)) {
 			clear_buffer_dirty(bh);
-			submit_bh_wbc(REQ_OP_WRITE, write_flags, bh, wbc);
+			submit_bh_wbc(REQ_OP_WRITE | write_flags, bh, wbc);
 			nr_underway++;
 		}
 		bh = next;
@@ -2033,7 +2033,7 @@ int __block_write_begin_int(struct folio *folio, loff_t pos, unsigned len,
 		if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
 		    !buffer_unwritten(bh) &&
 		     (block_start < from || block_end > to)) {
-			ll_rw_block(REQ_OP_READ, 0, 1, &bh);
+			ll_rw_block(REQ_OP_READ, 1, &bh);
 			*wait_bh++=bh;
 		}
 	}
@@ -2334,7 +2334,7 @@ int block_read_full_folio(struct folio *folio, get_block_t *get_block)
 		if (buffer_uptodate(bh))
 			end_buffer_async_read(bh, 1);
 		else
-			submit_bh(REQ_OP_READ, 0, bh);
+			submit_bh(REQ_OP_READ, bh);
 	}
 	return 0;
 }
@@ -2665,7 +2665,7 @@ int nobh_write_begin(struct address_space *mapping, loff_t pos, unsigned len,
 		if (block_start < from || block_end > to) {
 			lock_buffer(bh);
 			bh->b_end_io = end_buffer_read_nobh;
-			submit_bh(REQ_OP_READ, 0, bh);
+			submit_bh(REQ_OP_READ, bh);
 			nr_reads++;
 		}
 	}
@@ -2915,7 +2915,7 @@ int block_truncate_page(struct address_space *mapping,
 
 	if (!buffer_uptodate(bh) && !buffer_delay(bh) && !buffer_unwritten(bh)) {
 		err = -EIO;
-		ll_rw_block(REQ_OP_READ, 0, 1, &bh);
+		ll_rw_block(REQ_OP_READ, 1, &bh);
 		wait_on_buffer(bh);
 		/* Uhhuh. Read error. Complain and punt. */
 		if (!buffer_uptodate(bh))
@@ -2994,9 +2994,10 @@ static void end_bio_bh_io_sync(struct bio *bio)
 	bio_put(bio);
 }
 
-static int submit_bh_wbc(enum req_op op, blk_opf_t op_flags,
-			 struct buffer_head *bh, struct writeback_control *wbc)
+static int submit_bh_wbc(blk_opf_t opf, struct buffer_head *bh,
+			 struct writeback_control *wbc)
 {
+	const enum req_op op = opf & REQ_OP_MASK;
 	struct bio *bio;
 
 	BUG_ON(!buffer_locked(bh));
@@ -3012,11 +3013,11 @@ static int submit_bh_wbc(enum req_op op, blk_opf_t op_flags,
 		clear_buffer_write_io_error(bh);
 
 	if (buffer_meta(bh))
-		op_flags |= REQ_META;
+		opf |= REQ_META;
 	if (buffer_prio(bh))
-		op_flags |= REQ_PRIO;
+		opf |= REQ_PRIO;
 
-	bio = bio_alloc(bh->b_bdev, 1, op | op_flags, GFP_NOIO);
+	bio = bio_alloc(bh->b_bdev, 1, opf, GFP_NOIO);
 
 	fscrypt_set_bio_crypt_ctx_bh(bio, bh, GFP_NOIO);
 
@@ -3040,9 +3041,9 @@ static int submit_bh_wbc(enum req_op op, blk_opf_t op_flags,
 	return 0;
 }
 
-int submit_bh(enum req_op op, blk_opf_t op_flags, struct buffer_head *bh)
+int submit_bh(blk_opf_t opf, struct buffer_head *bh)
 {
-	return submit_bh_wbc(op, op_flags, bh, NULL);
+	return submit_bh_wbc(opf, bh, NULL);
 }
 EXPORT_SYMBOL(submit_bh);
 
@@ -3072,9 +3073,9 @@ 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(enum req_op op, blk_opf_t op_flags, int nr,
-		 struct buffer_head *bhs[])
+void ll_rw_block(const blk_opf_t opf, int nr, struct buffer_head *bhs[])
 {
+	const enum req_op op = opf & REQ_OP_MASK;
 	int i;
 
 	for (i = 0; i < nr; i++) {
@@ -3086,14 +3087,14 @@ void ll_rw_block(enum req_op op, blk_opf_t op_flags, int nr,
 			if (test_clear_buffer_dirty(bh)) {
 				bh->b_end_io = end_buffer_write_sync;
 				get_bh(bh);
-				submit_bh(op, op_flags, bh);
+				submit_bh(opf, bh);
 				continue;
 			}
 		} else {
 			if (!buffer_uptodate(bh)) {
 				bh->b_end_io = end_buffer_read_sync;
 				get_bh(bh);
-				submit_bh(op, op_flags, bh);
+				submit_bh(opf, bh);
 				continue;
 			}
 		}
@@ -3111,7 +3112,7 @@ void write_dirty_buffer(struct buffer_head *bh, blk_opf_t op_flags)
 	}
 	bh->b_end_io = end_buffer_write_sync;
 	get_bh(bh);
-	submit_bh(REQ_OP_WRITE, op_flags, bh);
+	submit_bh(REQ_OP_WRITE | op_flags, bh);
 }
 EXPORT_SYMBOL(write_dirty_buffer);
 
@@ -3138,7 +3139,7 @@ int __sync_dirty_buffer(struct buffer_head *bh, blk_opf_t op_flags)
 
 		get_bh(bh);
 		bh->b_end_io = end_buffer_write_sync;
-		ret = submit_bh(REQ_OP_WRITE, op_flags, bh);
+		ret = submit_bh(REQ_OP_WRITE | op_flags, bh);
 		wait_on_buffer(bh);
 		if (!ret && !buffer_uptodate(bh))
 			ret = -EIO;
@@ -3366,7 +3367,7 @@ int bh_submit_read(struct buffer_head *bh)
 
 	get_bh(bh);
 	bh->b_end_io = end_buffer_read_sync;
-	submit_bh(REQ_OP_READ, 0, bh);
+	submit_bh(REQ_OP_READ, bh);
 	wait_on_buffer(bh);
 	if (buffer_uptodate(bh))
 		return 0;
diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
index 795a60ad1897..0df5482c6c1c 100644
--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -668,7 +668,7 @@ static void ext4_fc_submit_bh(struct super_block *sb, bool is_tail)
 	set_buffer_dirty(bh);
 	set_buffer_uptodate(bh);
 	bh->b_end_io = ext4_end_buffer_io_sync;
-	submit_bh(REQ_OP_WRITE, write_flags, bh);
+	submit_bh(REQ_OP_WRITE | write_flags, bh);
 	EXT4_SB(sb)->s_fc_bh = NULL;
 }
 
diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c
index 79d05e464c43..a0140626894e 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(REQ_OP_WRITE, REQ_SYNC | REQ_META | REQ_PRIO, bh);
+	submit_bh(REQ_OP_WRITE | REQ_SYNC | REQ_META | REQ_PRIO, bh);
 	wait_on_buffer(bh);
 	sb_end_write(sb);
 	if (unlikely(!buffer_uptodate(bh)))
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 845f2f8aee5f..24922184b622 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -171,7 +171,7 @@ static inline void __ext4_read_bh(struct buffer_head *bh, int op_flags,
 
 	bh->b_end_io = end_io ? end_io : end_buffer_read_sync;
 	get_bh(bh);
-	submit_bh(REQ_OP_READ, op_flags, bh);
+	submit_bh(REQ_OP_READ | op_flags, bh);
 }
 
 void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
@@ -5939,8 +5939,8 @@ static int ext4_commit_super(struct super_block *sb)
 	/* Clear potential dirty bit if it was journalled update */
 	clear_buffer_dirty(sbh);
 	sbh->b_end_io = end_buffer_write_sync;
-	submit_bh(REQ_OP_WRITE,
-		  REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0), sbh);
+	submit_bh(REQ_OP_WRITE | REQ_SYNC |
+		  (test_opt(sb, BARRIER) ? REQ_FUA : 0), sbh);
 	wait_on_buffer(sbh);
 	if (buffer_write_io_error(sbh)) {
 		ext4_msg(sb, KERN_ERR, "I/O error while writing "
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index b6697333bb2b..3bdb2c668a71 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -310,9 +310,8 @@ static void gfs2_metapath_ra(struct gfs2_glock *gl, __be64 *start, __be64 *end)
 		if (trylock_buffer(rabh)) {
 			if (!buffer_uptodate(rabh)) {
 				rabh->b_end_io = end_buffer_read_sync;
-				submit_bh(REQ_OP_READ,
-					  REQ_RAHEAD | REQ_META | REQ_PRIO,
-					  rabh);
+				submit_bh(REQ_OP_READ | REQ_RAHEAD | REQ_META |
+					  REQ_PRIO, rabh);
 				continue;
 			}
 			unlock_buffer(rabh);
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index 42b7dfffb5e7..a0562dd1bada 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -1508,9 +1508,8 @@ static void gfs2_dir_readahead(struct inode *inode, unsigned hsize, u32 index,
 				continue;
 			}
 			bh->b_end_io = end_buffer_read_sync;
-			submit_bh(REQ_OP_READ,
-				  REQ_RAHEAD | REQ_META | REQ_PRIO,
-				  bh);
+			submit_bh(REQ_OP_READ | REQ_RAHEAD | REQ_META |
+				  REQ_PRIO, bh);
 			continue;
 		}
 		brelse(bh);
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 868dcc71b581..3570739f005d 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -75,7 +75,7 @@ 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(REQ_OP_WRITE, write_flags, bh);
+			submit_bh(REQ_OP_WRITE | write_flags, bh);
 			nr_underway++;
 		}
 		bh = next;
@@ -527,7 +527,7 @@ 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(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &first_bh);
+		ll_rw_block(REQ_OP_READ | REQ_META | REQ_PRIO, 1, &first_bh);
 
 	dblock++;
 	extlen--;
@@ -536,9 +536,8 @@ 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(REQ_OP_READ,
-				    REQ_RAHEAD | REQ_META | REQ_PRIO,
-				    1, &bh);
+			ll_rw_block(REQ_OP_READ | REQ_RAHEAD | REQ_META |
+				    REQ_PRIO, 1, &bh);
 		brelse(bh);
 		dblock++;
 		extlen--;
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 59d727a4ae2c..c98a7faa67d3 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -746,7 +746,7 @@ 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(REQ_OP_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))
 				goto unlock_out;
diff --git a/fs/isofs/compress.c b/fs/isofs/compress.c
index 95a19f25d61c..b466172eec25 100644
--- a/fs/isofs/compress.c
+++ b/fs/isofs/compress.c
@@ -82,7 +82,7 @@ static loff_t zisofs_uncompress_block(struct inode *inode, loff_t block_start,
 		return 0;
 	}
 	haveblocks = isofs_get_blocks(inode, blocknum, bhs, needblocks);
-	ll_rw_block(REQ_OP_READ, 0, haveblocks, bhs);
+	ll_rw_block(REQ_OP_READ, haveblocks, bhs);
 
 	curbh = 0;
 	curpage = 0;
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index eb315e81f1a6..890b5543a1c5 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -155,10 +155,10 @@ static int journal_submit_commit_record(journal_t *journal,
 
 	if (journal->j_flags & JBD2_BARRIER &&
 	    !jbd2_has_feature_async_commit(journal))
-		ret = submit_bh(REQ_OP_WRITE,
-			REQ_SYNC | REQ_PREFLUSH | REQ_FUA, bh);
+		ret = submit_bh(REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH |
+				REQ_FUA, bh);
 	else
-		ret = submit_bh(REQ_OP_WRITE, REQ_SYNC, bh);
+		ret = submit_bh(REQ_OP_WRITE | REQ_SYNC, bh);
 
 	*cbh = bh;
 	return ret;
@@ -763,7 +763,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
 				clear_buffer_dirty(bh);
 				set_buffer_uptodate(bh);
 				bh->b_end_io = journal_end_buffer_io_sync;
-				submit_bh(REQ_OP_WRITE, REQ_SYNC, bh);
+				submit_bh(REQ_OP_WRITE | REQ_SYNC, bh);
 			}
 			cond_resched();
 
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index c0cbeeaec2d1..fd169a356da9 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1636,7 +1636,7 @@ static int jbd2_write_superblock(journal_t *journal, int write_flags)
 		sb->s_checksum = jbd2_superblock_csum(journal, sb);
 	get_bh(bh);
 	bh->b_end_io = end_buffer_write_sync;
-	ret = submit_bh(REQ_OP_WRITE, write_flags, 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);
@@ -1898,7 +1898,7 @@ static int journal_get_superblock(journal_t *journal)
 
 	J_ASSERT(bh != NULL);
 	if (!buffer_uptodate(bh)) {
-		ll_rw_block(REQ_OP_READ, 0, 1, &bh);
+		ll_rw_block(REQ_OP_READ, 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 8ca3527189f8..e699d6ab2c0e 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -100,7 +100,7 @@ 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(REQ_OP_READ, 0, nbufs, bufs);
+				ll_rw_block(REQ_OP_READ, nbufs, bufs);
 				journal_brelse_array(bufs, nbufs);
 				nbufs = 0;
 			}
@@ -109,7 +109,7 @@ static int do_readahead(journal_t *journal, unsigned int start)
 	}
 
 	if (nbufs)
-		ll_rw_block(REQ_OP_READ, 0, nbufs, bufs);
+		ll_rw_block(REQ_OP_READ, nbufs, bufs);
 	err = 0;
 
 failed:
diff --git a/fs/nilfs2/btnode.c b/fs/nilfs2/btnode.c
index ca611ac09f7c..5c39efbf733f 100644
--- a/fs/nilfs2/btnode.c
+++ b/fs/nilfs2/btnode.c
@@ -122,7 +122,7 @@ 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, mode_flags, 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/gcinode.c b/fs/nilfs2/gcinode.c
index 04fdd420eae7..847def8af315 100644
--- a/fs/nilfs2/gcinode.c
+++ b/fs/nilfs2/gcinode.c
@@ -92,7 +92,7 @@ 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(REQ_OP_READ, 0, bh);
+	submit_bh(REQ_OP_READ, bh);
 	if (vbn)
 		bh->b_blocknr = vbn;
  out:
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index d29a0f2b9c16..66e8811c2528 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -148,7 +148,7 @@ nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff,
 
 	bh->b_end_io = end_buffer_read_sync;
 	get_bh(bh);
-	submit_bh(mode, mode_flags, bh);
+	submit_bh(mode | mode_flags, bh);
 	ret = 0;
 
 	trace_nilfs2_mdt_submit_block(inode, inode->i_ino, blkoff, mode);
diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
index 9e3964ea2ea0..b5765fdb3a47 100644
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -342,7 +342,7 @@ static int ntfs_read_block(struct page *page)
 		for (i = 0; i < nr; i++) {
 			tbh = arr[i];
 			if (likely(!buffer_uptodate(tbh)))
-				submit_bh(REQ_OP_READ, 0, tbh);
+				submit_bh(REQ_OP_READ, tbh);
 			else
 				ntfs_end_buffer_async_read(tbh, 1);
 		}
@@ -859,7 +859,7 @@ static int ntfs_write_block(struct page *page, struct writeback_control *wbc)
 	do {
 		struct buffer_head *next = bh->b_this_page;
 		if (buffer_async_write(bh)) {
-			submit_bh(REQ_OP_WRITE, 0, bh);
+			submit_bh(REQ_OP_WRITE, bh);
 			need_end_writeback = false;
 		}
 		bh = next;
@@ -1187,7 +1187,7 @@ static int ntfs_write_mst_block(struct page *page,
 		BUG_ON(!buffer_mapped(tbh));
 		get_bh(tbh);
 		tbh->b_end_io = end_buffer_write_sync;
-		submit_bh(REQ_OP_WRITE, 0, tbh);
+		submit_bh(REQ_OP_WRITE, 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 a60f543e7557..587e9b187873 100644
--- a/fs/ntfs/compress.c
+++ b/fs/ntfs/compress.c
@@ -658,7 +658,7 @@ int ntfs_read_compressed_block(struct page *page)
 		}
 		get_bh(tbh);
 		tbh->b_end_io = end_buffer_read_sync;
-		submit_bh(REQ_OP_READ, 0, tbh);
+		submit_bh(REQ_OP_READ, tbh);
 	}
 
 	/* Wait for io completion on all buffer heads. */
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index a8abe2296514..46ed69b86c33 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -537,7 +537,7 @@ 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(REQ_OP_READ, 0, bh);
+	return submit_bh(REQ_OP_READ, bh);
 }
 
 /**
diff --git a/fs/ntfs/logfile.c b/fs/ntfs/logfile.c
index bc1bf217b38e..6ce60ffc6ac0 100644
--- a/fs/ntfs/logfile.c
+++ b/fs/ntfs/logfile.c
@@ -807,7 +807,7 @@ bool ntfs_empty_logfile(struct inode *log_vi)
 			 * completed ignore errors afterwards as we can assume
 			 * that if one buffer worked all of them will work.
 			 */
-			submit_bh(REQ_OP_WRITE, 0, bh);
+			submit_bh(REQ_OP_WRITE, bh);
 			if (should_wait) {
 				should_wait = false;
 				wait_on_buffer(bh);
diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c
index 0d62cd5bb7f8..f7bf5ce960cc 100644
--- a/fs/ntfs/mft.c
+++ b/fs/ntfs/mft.c
@@ -583,7 +583,7 @@ 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(REQ_OP_WRITE, 0, tbh);
+			submit_bh(REQ_OP_WRITE, tbh);
 		}
 		/* Wait on i/o completion of buffers. */
 		for (i_bhs = 0; i_bhs < nr_bhs; i_bhs++) {
@@ -780,7 +780,7 @@ 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(REQ_OP_WRITE, 0, tbh);
+		submit_bh(REQ_OP_WRITE, tbh);
 	}
 	/* Synchronize the mft mirror now if not @sync. */
 	if (!sync && ni->mft_no < vol->mftmirr_size)
diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
index 8e9d2b35175f..4a21745711fe 100644
--- a/fs/ntfs3/file.c
+++ b/fs/ntfs3/file.c
@@ -242,7 +242,7 @@ static int ntfs_zero_range(struct inode *inode, u64 vbo, u64 vbo_to)
 				lock_buffer(bh);
 				bh->b_end_io = end_buffer_read_sync;
 				get_bh(bh);
-				submit_bh(REQ_OP_READ, 0, bh);
+				submit_bh(REQ_OP_READ, bh);
 
 				wait_on_buffer(bh);
 				if (!buffer_uptodate(bh)) {
diff --git a/fs/ntfs3/inode.c b/fs/ntfs3/inode.c
index be4ebdd8048b..d100a063def2 100644
--- a/fs/ntfs3/inode.c
+++ b/fs/ntfs3/inode.c
@@ -629,7 +629,7 @@ static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
 			bh->b_size = block_size;
 			off = vbo & (PAGE_SIZE - 1);
 			set_bh_page(bh, page, off);
-			ll_rw_block(REQ_OP_READ, 0, 1, &bh);
+			ll_rw_block(REQ_OP_READ, 1, &bh);
 			wait_on_buffer(bh);
 			if (!buffer_uptodate(bh)) {
 				err = -EIO;
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 35d40a67204c..304ed2be1b83 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -638,7 +638,7 @@ 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(REQ_OP_READ, 0, 1, &bh);
+			ll_rw_block(REQ_OP_READ, 1, &bh);
 			*wait_bh++=bh;
 		}
 
diff --git a/fs/ocfs2/buffer_head_io.c b/fs/ocfs2/buffer_head_io.c
index e7758778abef..196638a22b48 100644
--- a/fs/ocfs2/buffer_head_io.c
+++ b/fs/ocfs2/buffer_head_io.c
@@ -64,7 +64,7 @@ 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(REQ_OP_WRITE, 0, bh);
+	submit_bh(REQ_OP_WRITE, bh);
 
 	wait_on_buffer(bh);
 
@@ -147,7 +147,7 @@ int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
 
 		get_bh(bh); /* for end_buffer_read_sync() */
 		bh->b_end_io = end_buffer_read_sync;
-		submit_bh(REQ_OP_READ, 0, bh);
+		submit_bh(REQ_OP_READ, bh);
 	}
 
 read_failure:
@@ -328,7 +328,7 @@ 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(REQ_OP_READ, 0, bh);
+			submit_bh(REQ_OP_READ, bh);
 			continue;
 		}
 	}
@@ -449,7 +449,7 @@ 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(REQ_OP_WRITE, 0, bh);
+	submit_bh(REQ_OP_WRITE, bh);
 
 	wait_on_buffer(bh);
 
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index f7298816d8d9..e68807196076 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1785,7 +1785,7 @@ static int ocfs2_get_sector(struct super_block *sb,
 	if (!buffer_dirty(*bh))
 		clear_buffer_uptodate(*bh);
 	unlock_buffer(*bh);
-	ll_rw_block(REQ_OP_READ, 0, 1, bh);
+	ll_rw_block(REQ_OP_READ, 1, bh);
 	wait_on_buffer(*bh);
 	if (!buffer_uptodate(*bh)) {
 		mlog_errno(-EIO);
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 0cffe054b78e..23f542d1748b 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -2664,7 +2664,7 @@ 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(REQ_OP_WRITE, 0, bh);
+			submit_bh(REQ_OP_WRITE, bh);
 			nr++;
 		}
 		put_bh(bh);
@@ -2724,7 +2724,7 @@ static int reiserfs_write_full_page(struct page *page,
 		struct buffer_head *next = bh->b_this_page;
 		if (buffer_async_write(bh)) {
 			clear_buffer_dirty(bh);
-			submit_bh(REQ_OP_WRITE, 0, bh);
+			submit_bh(REQ_OP_WRITE, bh);
 			nr++;
 		}
 		put_bh(bh);
diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index d8cc9a366124..94addfcefede 100644
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -650,7 +650,7 @@ static void submit_logged_buffer(struct buffer_head *bh)
 		BUG();
 	if (!buffer_uptodate(bh))
 		BUG();
-	submit_bh(REQ_OP_WRITE, 0, bh);
+	submit_bh(REQ_OP_WRITE, bh);
 }
 
 static void submit_ordered_buffer(struct buffer_head *bh)
@@ -660,7 +660,7 @@ static void submit_ordered_buffer(struct buffer_head *bh)
 	clear_buffer_dirty(bh);
 	if (!buffer_uptodate(bh))
 		BUG();
-	submit_bh(REQ_OP_WRITE, 0, bh);
+	submit_bh(REQ_OP_WRITE, bh);
 }
 
 #define CHUNK_SIZE 32
@@ -868,7 +868,7 @@ static int write_ordered_buffers(spinlock_t * lock,
 		 */
 		if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
 			spin_unlock(lock);
-			ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
+			ll_rw_block(REQ_OP_WRITE, 1, &bh);
 			spin_lock(lock);
 		}
 		put_bh(bh);
@@ -1054,7 +1054,7 @@ static int flush_commit_list(struct super_block *s,
 		if (tbh) {
 			if (buffer_dirty(tbh)) {
 		            depth = reiserfs_write_unlock_nested(s);
-			    ll_rw_block(REQ_OP_WRITE, 0, 1, &tbh);
+			    ll_rw_block(REQ_OP_WRITE, 1, &tbh);
 			    reiserfs_write_lock_nested(s, depth);
 			}
 			put_bh(tbh) ;
@@ -2240,7 +2240,7 @@ static int journal_read_transaction(struct super_block *sb,
 		}
 	}
 	/* read in the log blocks, memcpy to the corresponding real block */
-	ll_rw_block(REQ_OP_READ, 0, get_desc_trans_len(desc), log_blocks);
+	ll_rw_block(REQ_OP_READ, get_desc_trans_len(desc), log_blocks);
 	for (i = 0; i < get_desc_trans_len(desc); i++) {
 
 		wait_on_buffer(log_blocks[i]);
@@ -2342,7 +2342,7 @@ static struct buffer_head *reiserfs_breada(struct block_device *dev,
 		} else
 			bhlist[j++] = bh;
 	}
-	ll_rw_block(REQ_OP_READ, 0, j, bhlist);
+	ll_rw_block(REQ_OP_READ, 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 ef42729216d1..9a293609a022 100644
--- a/fs/reiserfs/stree.c
+++ b/fs/reiserfs/stree.c
@@ -579,7 +579,7 @@ 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(REQ_OP_READ, REQ_RAHEAD, 1, bh + j);
+			ll_rw_block(REQ_OP_READ | REQ_RAHEAD, 1, bh + j);
 		}
 		brelse(bh[j]);
 	}
@@ -685,7 +685,7 @@ 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(REQ_OP_READ, 0, 1, &bh);
+			ll_rw_block(REQ_OP_READ, 1, &bh);
 			wait_on_buffer(bh);
 
 			if (depth != -1)
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index cfb7c44c7366..c88cd2ce0665 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -1702,7 +1702,7 @@ 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(REQ_OP_READ, 0, 1, &SB_BUFFER_WITH_SB(s));
+	ll_rw_block(REQ_OP_READ, 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/udf/dir.c b/fs/udf/dir.c
index 42e3e551fa4c..cad3772f9dbe 100644
--- a/fs/udf/dir.c
+++ b/fs/udf/dir.c
@@ -130,7 +130,7 @@ static int udf_readdir(struct file *file, struct dir_context *ctx)
 					brelse(tmp);
 			}
 			if (num) {
-				ll_rw_block(REQ_OP_READ, REQ_RAHEAD, 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 73720320f0ab..a2adf6293093 100644
--- a/fs/udf/directory.c
+++ b/fs/udf/directory.c
@@ -89,7 +89,7 @@ struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
 					brelse(tmp);
 			}
 			if (num) {
-				ll_rw_block(REQ_OP_READ, REQ_RAHEAD, 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 edc88716751a..8d06daed549f 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1214,7 +1214,7 @@ struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
 	if (buffer_uptodate(bh))
 		return bh;
 
-	ll_rw_block(REQ_OP_READ, 0, 1, &bh);
+	ll_rw_block(REQ_OP_READ, 1, &bh);
 
 	wait_on_buffer(bh);
 	if (buffer_uptodate(bh))
diff --git a/fs/ufs/balloc.c b/fs/ufs/balloc.c
index 075d3d9114c8..bd810d8239f2 100644
--- a/fs/ufs/balloc.c
+++ b/fs/ufs/balloc.c
@@ -296,7 +296,7 @@ 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(REQ_OP_READ, 0, 1, &bh);
+				ll_rw_block(REQ_OP_READ, 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 9795df9400bd..bb68eb6407da 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -202,11 +202,11 @@ 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(enum req_op, blk_opf_t, int, struct buffer_head * bh[]);
+void ll_rw_block(blk_opf_t, int, struct buffer_head * bh[]);
 int sync_dirty_buffer(struct buffer_head *bh);
 int __sync_dirty_buffer(struct buffer_head *bh, blk_opf_t op_flags);
 void write_dirty_buffer(struct buffer_head *bh, blk_opf_t op_flags);
-int submit_bh(enum req_op, blk_opf_t, struct buffer_head *);
+int submit_bh(blk_opf_t, 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);