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/ocfs2/super.c b/fs/ocfs2/super.c
index fa1be1b..b7e4f2d 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1002,6 +1002,8 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 	char nodestr[8];
 	struct ocfs2_blockcheck_stats stats;
 
+	lock_kernel();
+
 	mlog_entry("%p, %p, %i", sb, data, silent);
 
 	if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
@@ -1179,6 +1181,7 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 			atomic_set(&osb->vol_state, VOLUME_DISABLED);
 			wake_up(&osb->osb_mount_event);
 			mlog_exit(status);
+			unlock_kernel();
 			return status;
 		}
 	}
@@ -1193,6 +1196,7 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 	ocfs2_orphan_scan_start(osb);
 
 	mlog_exit(status);
+	unlock_kernel();
 	return status;
 
 read_super_error:
@@ -1208,6 +1212,7 @@ read_super_error:
 	}
 
 	mlog_exit(status);
+	unlock_kernel();
 	return status;
 }