push BKL down into ->put_super

Move BKL into ->put_super from the only caller.  A couple of
filesystems had trivial enough ->put_super (only kfree and NULLing of
s_fs_info + stuff in there) to not get any locking: coda, cramfs, efs,
hugetlbfs, omfs, qnx4, shmem, all others got the full treatment.  Most
of them probably don't need it, but I'd rather sort that out individually.
Preferably after all the other BKL pushdowns in that area.

[AV: original used to move lock_super() down as well; these changes are
removed since we don't do lock_super() at all in generic_shutdown_super()
now]
[AV: fuse, btrfs and xfs are known to need no damn BKL, exempt]

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

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 0d3034c5e8a4..1d4180b86772 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -577,6 +577,7 @@ static void ext4_put_super(struct super_block *sb)
         int i, err;
 
         lock_super(sb);
+        lock_kernel();
         if (sb->s_dirt)
                 ext4_write_super(sb);
 
@@ -646,7 +647,6 @@ static void ext4_put_super(struct super_block *sb)
         unlock_super(sb);
         kobject_put(&sbi->s_kobj);
         wait_for_completion(&sbi->s_kobj_unregister);
-        lock_kernel();
         kfree(sbi->s_blockgroup_lock);
         kfree(sbi);
 }