ext4 already uses synchronous discards, no need to add I/O barriers.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Index: linux-2.6/fs/ext4/mballoc.c
===================================================================
--- linux-2.6.orig/fs/ext4/mballoc.c 2010-08-17 16:48:50.546274081 +0200
+++ linux-2.6/fs/ext4/mballoc.c 2010-08-17 16:48:58.896006097 +0200
@@ -2589,9 +2589,7 @@ static void release_blocks_on_commit(jou
(unsigned long long)discard_block,
entry->count);
ret = sb_issue_discard(sb, discard_block, entry->count,
- GFP_NOFS,
- BLKDEV_IFL_WAIT |
- BLKDEV_IFL_BARRIER);
+ GFP_NOFS, BLKDEV_IFL_WAIT);
if (ret == EOPNOTSUPP) {
ext4_warning(sb,
"discard not supported, disabling");
--
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