BKL: Explicitly add BKL around get_sb/fill_super

This patch is a preparation necessary to remove the BKL from do_new_mount().
It explicitly adds calls to lock_kernel()/unlock_kernel() around
get_sb/fill_super operations for filesystems that still uses the BKL.

I've read through all the code formerly covered by the BKL inside
do_kern_mount() and have satisfied myself that it doesn't need the BKL
any more.

do_kern_mount() is already called without the BKL when mounting the rootfs
and in nfsctl. do_kern_mount() calls vfs_kern_mount(), which is called
from various places without BKL: simple_pin_fs(), nfs_do_clone_mount()
through nfs_follow_mountpoint(), afs_mntpt_do_automount() through
afs_mntpt_follow_link(). Both later functions are actually the filesystems
follow_link inode operation. vfs_kern_mount() is calling the specified
get_sb function and lets the filesystem do its job by calling the given
fill_super function.

Therefore I think it is safe to push down the BKL from the VFS to the
low-level filesystems get_sb/fill_super operation.

[arnd: do not add the BKL to those file systems that already
       don't use it elsewhere]

Signed-off-by: Jan Blunck <jblunck@infradead.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Christoph Hellwig <hch@infradead.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/afs/super.c b/fs/afs/super.c
index 77e1e5a61154..6c2fef44d385 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -302,12 +302,15 @@ static int afs_fill_super(struct super_block *sb, void *data)
         struct inode *inode = NULL;
         int ret;
 
+        lock_kernel();
+
         _enter("");
 
         /* allocate a superblock info record */
         as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
         if (!as) {
                 _leave(" = -ENOMEM");
+                unlock_kernel();
                 return -ENOMEM;
         }
 
@@ -341,6 +344,7 @@ static int afs_fill_super(struct super_block *sb, void *data)
         sb->s_root = root;
 
         _leave(" = 0");
+        unlock_kernel();
         return 0;
 
 error_inode:
@@ -354,6 +358,7 @@ error:
         sb->s_fs_info = NULL;
 
         _leave(" = %d", ret);
+        unlock_kernel();
         return ret;
 }