quota: make Q_XQUOTASYNC a noop

Now that XFS takes quota reservations into account there is no need to flush
anything before reporting quotas - in addition to beeing fully transactional
all quota information is also 100% coherent with the rest of the filesystem
now.

Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index 7898cd688a00..7a9bedeb1d57 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -282,10 +282,9 @@ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
         case Q_XGETQUOTA:
                 return quota_getxquota(sb, type, id, addr);
         case Q_XQUOTASYNC:
-                /* caller already holds s_umount */
                 if (sb->s_flags & MS_RDONLY)
                         return -EROFS;
-                writeback_inodes_sb(sb, WB_REASON_SYNC);
+                /* XFS quotas are fully coherent now, making this call a noop */
                 return 0;
         default:
                 return -EINVAL;