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>
diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index 2607010..c969a1a 100644
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -477,11 +477,15 @@
int o;
+ lock_kernel();
+
save_mount_options(s, options);
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
- if (!sbi)
+ if (!sbi) {
+ unlock_kernel();
return -ENOMEM;
+ }
s->s_fs_info = sbi;
sbi->sb_bmp_dir = NULL;
@@ -666,6 +670,7 @@
root->i_blocks = 5;
hpfs_brelse4(&qbh);
}
+ unlock_kernel();
return 0;
bail4: brelse(bh2);
@@ -677,6 +682,7 @@
kfree(sbi->sb_cp_table);
s->s_fs_info = NULL;
kfree(sbi);
+ unlock_kernel();
return -EINVAL;
}