[PATCH 26/30] ext4: do not send discards as barriers
From: Tejun Heo
Date: Wed Aug 25 2010 - 11:54:55 EST
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
ext4 already uses synchronous discards, no need to add I/O barriers.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
---
fs/ext4/mballoc.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index df44b34..a22bfef 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2567,7 +2567,7 @@ static inline void ext4_issue_discard(struct super_block *sb,
trace_ext4_discard_blocks(sb,
(unsigned long long) discard_block, count);
ret = sb_issue_discard(sb, discard_block, count, GFP_NOFS,
- BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER);
+ BLKDEV_IFL_WAIT);
if (ret == EOPNOTSUPP) {
ext4_warning(sb, "discard not supported, disabling");
clear_opt(EXT4_SB(sb)->s_mount_opt, DISCARD);
--
1.7.1
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