On Tue, Dec 21, 2010 at 07:55:38PM +1100, Nick Piggin wrote:

On Tue, Dec 21, 2010 at 09:44:40AM +0100, Sedat Dilek wrote:

quoted

Against linux-next (next-20101210) it should look like:

Yep, I'll rebase my tree with the fix shortly.

quoted

$ diff -Naur cgroup-fix/cgroup-fs-avoid-switching-d_op-on-live-dentry.patch
cgroup-fix/cgroup-fs-avoid-switching-d_op-on-live-dentry-v2.patch

--- cgroup-fix/cgroup-fs-avoid-switching-d_op-on-live-dentry.patch
 2010-12-21 09:31:38.649601964 +0100
+++ cgroup-fix/cgroup-fs-avoid-switching-d_op-on-live-dentry-v2.patch
 2010-12-21 09:40:21.151033232 +0100

@@ -83,7 +83,7 @@
                inode->i_size = 0;
                inode->i_fop = &cgroup_file_operations;
        }
--      dentry->d_op = &cgroup_dops;
+-      d_set_d_op(dentry, &cgroup_dops);
        d_instantiate(dentry, inode);
        dget(dentry);   /* Extra count - pin the dentry in core */
        return 0;

How about not doing that d_set_d_op() at all?  See #d_op in vfs-2.6.git;
just set ->s_d_op to that once and be done with that.  No need to reassign
it on a live dentry...