->write_super lock_super pushdown

Push down lock_super into ->write_super instances and remove it from the
caller.

Following filesystem don't need ->s_lock in ->write_super and are skipped:

 * bfs, nilfs2 - no other uses of s_lock and have internal locks in
	->write_super
 * ext2 - uses BKL in ext2_write_super and has internal calls without s_lock
 * reiserfs - no other uses of s_lock as has reiserfs_write_lock (BKL) in
 	->write_super
 * xfs - no other uses of s_lock and uses internal lock (buffer lock on
	superblock buffer) to serialize ->write_super.  Also xfs_fs_write_super
	is superflous and will go away in the next merge window

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

1 files changed, 5 insertions, 3 deletions

diff --git a/fs/hfs/super.c b/fs/hfs/super.c
index 9f5eaa01cc77..3aac41751030 100644
--- a/fs/hfs/super.c
+++ b/fs/hfs/super.c
@@ -49,11 +49,13 @@ MODULE_LICENSE("GPL");
  */
 static void hfs_write_super(struct super_block *sb)
 {
+        lock_super(sb);
         sb->s_dirt = 0;
-        if (sb->s_flags & MS_RDONLY)
-                return;
+
         /* sync everything to the buffers */
-        hfs_mdb_commit(sb);
+        if (!(sb->s_flags & MS_RDONLY))
+                hfs_mdb_commit(sb);
+        unlock_super(sb);
 }
 
 /*