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, 8 insertions, 1 deletions

diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index 5dbf4dba03c4..41f9dcd73e97 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -1611,14 +1611,19 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
         __le32 features;
         int err;
 
+        lock_kernel();
+
         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
-        if (!sbi)
+        if (!sbi) {
+                unlock_kernel();
                 return -ENOMEM;
+        }
 
         sbi->s_blockgroup_lock =
                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
         if (!sbi->s_blockgroup_lock) {
                 kfree(sbi);
+                unlock_kernel();
                 return -ENOMEM;
         }
         sb->s_fs_info = sbi;
@@ -2026,6 +2031,7 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
                 "writeback");
 
         lock_kernel();
+        unlock_kernel();
         return 0;
 
 cantfind_ext3:
@@ -2056,6 +2062,7 @@ out_fail:
         kfree(sbi->s_blockgroup_lock);
         kfree(sbi);
         lock_kernel();
+        unlock_kernel();
         return ret;
 }