hfs: don't allow mounting over .../rsrc

That's one case when unlink() destroys a subtree, thanks to "resource
fork" idiocy.  We might forcibly evict that shit on unlink(2), but
for now let's just disallow overmounting; as it is, anything that
plays games with those would leak mounts.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 0612fa367bd1..b3309b83371a 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -543,6 +543,7 @@ static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
         igrab(dir);
         hlist_add_fake(&inode->i_hash);
         mark_inode_dirty(inode);
+        dont_mount(dentry);
 out:
         return d_splice_alias(inode, dentry);
 }