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, 12 deletions

diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index bb685269f832..08d6bd9a3947 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -1104,15 +1104,6 @@ xfs_fs_put_super(
         kfree(mp);
 }
 
-STATIC void
-xfs_fs_write_super(
-        struct super_block      *sb)
-{
-        if (!(sb->s_flags & MS_RDONLY))
-                xfs_sync_fsdata(XFS_M(sb), 0);
-        sb->s_dirt = 0;
-}
-
 STATIC int
 xfs_fs_sync_super(
         struct super_block      *sb,
@@ -1137,7 +1128,6 @@ xfs_fs_sync_super(
                 error = xfs_quiesce_data(mp);
         else
                 error = xfs_sync_fsdata(mp, 0);
-        sb->s_dirt = 0;
 
         if (unlikely(laptop_mode)) {
                 int     prev_sync_seq = mp->m_sync_seq;
@@ -1443,7 +1433,6 @@ xfs_fs_fill_super(
 
         XFS_SEND_MOUNT(mp, DM_RIGHT_NULL, mtpt, mp->m_fsname);
 
-        sb->s_dirt = 1;
         sb->s_magic = XFS_SB_MAGIC;
         sb->s_blocksize = mp->m_sb.sb_blocksize;
         sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
@@ -1533,7 +1522,6 @@ static struct super_operations xfs_super_operations = {
         .write_inode            = xfs_fs_write_inode,
         .clear_inode            = xfs_fs_clear_inode,
         .put_super              = xfs_fs_put_super,
-        .write_super            = xfs_fs_write_super,
         .sync_fs                = xfs_fs_sync_super,
         .freeze_fs              = xfs_fs_freeze,
         .statfs                 = xfs_fs_statfs,