Re: JFS readdir() issues in stable 3.2

Dave Kleikamp
2015-03-21T21:59:39Z

On 03/20/2015 06:33 PM, Richard Weinberger wrote:
> Hi!
>
> Mainline commit 44512449c0ab368889dd13ae0031fba74ee7e1d2
> (jfs: fix readdir cookie incompatibility with NFSv4) does not work as expected on 3.2.
> Maybe on other stable kernels too.
>
> UML stumbled over it:
> https://bugzilla.kernel.org/show_bug.cgi?id=94741
>
> If you run the attached readdir.c on a JFS on stable 3.2.51+ readdir() will not
> increment the directory offset nor return NULL, hence the caller will loop forever.
> It looks like if the current directory offset is > 0 and you run seekdir(telldir())
> the next readdir() call will not increment it.

The backport failed to pass the proper position to filldir() for the .
and .. entries. I've attached a proposed patch to the above bug.

>
> Dave, has your fix some unnamed dependencies which need backporting too?
>
> Thanks,
> //richard

Thanks!
Shaggy