xfs: remove ->write_super and stop maintaining ->s_dirt

the write_super method is used for

 (1) writing back the superblock periodically from pdflush
 (2) called just before ->sync_fs for data integerity syncs

We don't need (1) because we have our own peridoc writeout through xfssyncd,
and we don't need (2) because xfs_fs_sync_fs performs a proper synchronous
superblock writeout after all other data and metadata has been written out.

Also remove ->s_dirt tracking as it's only used to decide when too call
->write_super.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 0 insertions, 2 deletions

diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index 8570b826fedd..bcc39d358ad3 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -628,8 +628,6 @@ xfs_trans_apply_sb_deltas(
                 xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
                                   offsetof(xfs_dsb_t, sb_frextents) +
                                   sizeof(sbp->sb_frextents) - 1);
-
-        tp->t_mountp->m_super->s_dirt = 1;
 }
 
 /*