On Mon, Sep 09, 2013 at 01:46:47AM +0100, Al Viro wrote:
> On Sat, Sep 07, 2013 at 02:46:01PM -0400, J. Bruce Fields wrote:
> > From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
> >
> > DCACHE_DISCONNECTED should not be cleared until we're sure the dentry is
> > connected all the way up to the root of the filesystem. It *shouldn't*
> > be cleared as soon as the dentry is connected to a parent. That will
> > cause bugs at least on exportable filesystems.
>
> Then you probably want this
> if (!IS_ROOT(pd)) {
> /* must have found a connected parent - great */
> spin_lock(&pd->d_lock);
> pd->d_flags &= ~DCACHE_DISCONNECTED;
> spin_unlock(&pd->d_lock);
> noprogress = 0;
> to go through all intermediates, clearing DCACHE_DISCONNECTED on all of
> them; O(depth^2) can suck when we have a long chain of directories...
Aka call reconnect_path() from fs/exportfs/expfs.c on it.
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