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    Subject[PATCH 26/30] ext4: do not send discards as barriers
    Date
    From: Christoph Hellwig <hch@infradead.org>

    ext4 already uses synchronous discards, no need to add I/O barriers.

    Signed-off-by: Christoph Hellwig <hch@lst.de>
    Signed-off-by: Tejun Heo <tj@kernel.org>
    ---
    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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