On Sat, Jul 07, 2012 at 04:46:59PM -0700, 'Tejun Heo' wrote:
> Fix it by holding an extra superblock->s_active reference across
> dput() from css release, which is the dput() path added by 48ddbe1946
> and the only one which doesn't hold an extra s_active ref across the
> final cgroup dput().
> @@ -3883,8 +3883,12 @@ static void css_dput_fn(struct work_struct *work)
> {
> struct cgroup_subsys_state *css =
> container_of(work, struct cgroup_subsys_state, dput_work);
> + struct dentry *dentry = css->cgroup->dentry;
> + struct super_block *sb = dentry->d_sb;
>
> - dput(css->cgroup->dentry);
> + atomic_inc(&sb->s_active);
> + dput(dentry);
> + deactivate_super(sb);
> }
While we are at it, what guarantees that css->dput_work will complete before
css->cgroup or the object containing css get freed under us?
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