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authorJan Blunck <jblunck@infradead.org>2010-08-15 22:51:10 +0200
committerArnd Bergmann <arnd@arndb.de>2010-10-04 21:10:10 +0200
commitdb71922217a214e5c9268448e537b54fc1f301ea (patch)
tree9c9afbf29411547891f6968e5ade29ce59d66c07 /fs/bfs
parentLinux 2.6.36-rc6 (diff)
downloadlinux-db71922217a214e5c9268448e537b54fc1f301ea.tar.xz
linux-db71922217a214e5c9268448e537b54fc1f301ea.zip
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>
Diffstat (limited to 'fs/bfs')
-rw-r--r--fs/bfs/inode.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/bfs/inode.c b/fs/bfs/inode.c
index c4daf0f5fc02..d2e09363dd93 100644
--- a/fs/bfs/inode.c
+++ b/fs/bfs/inode.c
@@ -322,9 +322,13 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
int ret = -EINVAL;
unsigned long i_sblock, i_eblock, i_eoff, s_size;
+ lock_kernel();
+
info = kzalloc(sizeof(*info), GFP_KERNEL);
- if (!info)
+ if (!info) {
+ unlock_kernel();
return -ENOMEM;
+ }
mutex_init(&info->bfs_lock);
s->s_fs_info = info;
@@ -439,6 +443,7 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
brelse(bh);
brelse(sbh);
dump_imap("read_super", s);
+ unlock_kernel();
return 0;
out3:
@@ -452,6 +457,7 @@ out:
mutex_destroy(&info->bfs_lock);
kfree(info);
s->s_fs_info = NULL;
+ unlock_kernel();
return ret;
}