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, 4 insertions, 0 deletions

diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index 0adc624c956f..3b52770f46ff 100644
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -338,6 +338,8 @@ static int squashfs_remount(struct super_block *sb, int *flags, char *data)
 
 static void squashfs_put_super(struct super_block *sb)
 {
+        lock_kernel();
+
         if (sb->s_fs_info) {
                 struct squashfs_sb_info *sbi = sb->s_fs_info;
                 squashfs_cache_delete(sbi->block_cache);
@@ -350,6 +352,8 @@ static void squashfs_put_super(struct super_block *sb)
                 kfree(sb->s_fs_info);
                 sb->s_fs_info = NULL;
         }
+
+        unlock_kernel();
 }