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| author | Theodore Ts'o <tytso@mit.edu> | 2013-04-20 23:46:17 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2013-04-20 23:46:17 +0400 |
| commit | 9f203507ed277ee86e3f76a15e09db1c92e40b94 (patch) | |
| tree | 3055dbd2f6a885b20db3fda1d56ea0d9e780d9dd | |
| parent | c4d8b0235aa98f8c26bf94d308be3fdd24154572 (diff) | |
| download | linux-9f203507ed277ee86e3f76a15e09db1c92e40b94.tar.xz | |
ext4: mark all metadata I/O with REQ_META
As Dave Chinner pointed out at the 2013 LSF/MM workshop, it's
important that metadata I/O requests are marked as such to avoid
priority inversions caused by I/O bandwidth throttling.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| -rw-r--r-- | fs/ext4/balloc.c | 2 | ||||
| -rw-r--r-- | fs/ext4/ialloc.c | 2 | ||||
| -rw-r--r-- | fs/ext4/mmp.c | 4 | ||||
| -rw-r--r-- | fs/ext4/super.c | 2 |
4 files changed, 5 insertions, 5 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c index 8dcaea69e37f..d0f13eada0ed 100644 --- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -441,7 +441,7 @@ 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, bh); + submit_bh(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 18d36d85f5c9..00a818d67b54 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -166,7 +166,7 @@ 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, bh); + submit_bh(READ | REQ_META | REQ_PRIO, bh); wait_on_buffer(bh); if (!buffer_uptodate(bh)) { put_bh(bh); diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c index b3b1f7d99448..214461e42a05 100644 --- a/fs/ext4/mmp.c +++ b/fs/ext4/mmp.c @@ -54,7 +54,7 @@ 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, bh); + submit_bh(WRITE_SYNC | REQ_META | REQ_PRIO, bh); wait_on_buffer(bh); sb_end_write(sb); if (unlikely(!buffer_uptodate(bh))) @@ -86,7 +86,7 @@ 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, *bh); + submit_bh(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 bfa29ecfb47a..dbc7c090c13a 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -4252,7 +4252,7 @@ static journal_t *ext4_get_dev_journal(struct super_block *sb, goto out_bdev; } journal->j_private = sb; - ll_rw_block(READ, 1, &journal->j_sb_buffer); + ll_rw_block(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"); |