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, 5 insertions, 0 deletions

diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index 40bdab79dae8..9b292dcc39c8 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -199,6 +199,9 @@ static void hfsplus_put_super(struct super_block *sb)
         dprint(DBG_SUPER, "hfsplus_put_super\n");
         if (!sb->s_fs_info)
                 return;
+
+        lock_kernel();
+
         if (sb->s_dirt)
                 hfsplus_write_super(sb);
         if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
@@ -220,6 +223,8 @@ static void hfsplus_put_super(struct super_block *sb)
                 unload_nls(HFSPLUS_SB(sb).nls);
         kfree(sb->s_fs_info);
         sb->s_fs_info = NULL;
+
+        unlock_kernel();
 }
 
 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)