ext2: Remove s_dirt handling

Places which modify superblock feature / state fields mark the superblock
buffer dirty so it is written out by flusher thread. Thus there's no need to
set s_dirt there.

The only other fields changing in the superblock are the numbers of free
blocks, free inodes and s_wtime. There's no real need to write (or even
compute) these periodically. Free blocks / inodes counters are recomputed on
every mount from group counters anyway and value of s_wtime is only
informational and imprecise anyway. So it should be enough to write these
opportunistically on mount, remount, umount, and sync_fs times.

Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 0 insertions, 3 deletions

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 12a7916cfa9d..a43f9adcc811 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -1158,7 +1158,6 @@ static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
         mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
         if (wait)
                 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
-        sb->s_dirt = 0;
 }
 
 /*
@@ -1191,8 +1190,6 @@ void ext2_write_super(struct super_block *sb)
 {
         if (!(sb->s_flags & MS_RDONLY))
                 ext2_sync_fs(sb, 1);
-        else
-                sb->s_dirt = 0;
 }
 
 static int ext2_remount (struct super_block * sb, int * flags, char * data)