vfs: Call ->sync_fs() even if s_dirt is 0 (version 4)

sync_filesystems() has a condition that if wait == 0 and s_dirt == 0, then
->sync_fs() isn't called. This does not really make much sence since s_dirt is
generally used by a filesystem to mean that ->write_super() needs to be called.
But ->sync_fs() does different things. I even suspect that some filesystems
(btrfs?) sets s_dirt just to fool this logic.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/super.c b/fs/super.c
index 18d159d..fae91ba 100644 (file)
--- a/fs/super.c
+++ b/fs/super.c
@@ -510,7 +510,7 @@ restart:
                sb->s_count++;
                spin_unlock(&sb_lock);
                down_read(&sb->s_umount);
-               if (sb->s_root && (wait || sb->s_dirt))
+               if (sb->s_root)
                        sb->s_op->sync_fs(sb, wait);
                up_read(&sb->s_umount);
                /* restart only when sb is no longer on the list */