linux-kernel - Re: [PATCH] ceph: check negative offsets on ceph

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Message-ID: <87lgmixck8.fsf@hermes>
Date:   Thu, 17 Aug 2017 19:40:39 +0100
From:   Luis Henriques <lhenriques@...e.com>
To:     Ilya Dryomov <idryomov@...il.com>
Cc:     "Yan\, Zheng" <zyan@...hat.com>, Sage Weil <sage@...hat.com>,
        Ceph Development <ceph-devel@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ceph: check negative offsets on ceph_llseek()

Ilya Dryomov <idryomov@...il.com> writes:

> On Thu, Aug 17, 2017 at 3:45 PM, Luis Henriques <lhenriques@...e.com> wrote:
>> Luis Henriques <lhenriques@...e.com> writes:
>>
>>> When a user requests SEEK_HOLE or SEEK_DATA with a negative offset
>>> ceph_llseek should return -ENXIO.  Currently -EINVAL is being returned for
>>> SEEK_DATA and 0 for SEEK_HOLE.
>>
>> Ping
>>
>> This patch should make xfstest generic/448 happy.
>
> It should or it does? ;)
>

Heh, it *does* make generic/448 happy.

>
> I saw generic/448 failures on ext4 with Darrick's recent test
>change,
> haven't tried ceph yet.

The generic/448 test currently fails with the error codes described in
the commit log.  I didn't found it useful to include in the commit
log, but here's the full test output:

File system supports the default behavior.
File system does not support unwritten extents.
File system magic#: 0xc36400
Allocation size: 4194304
18. Test file with negative SEEK_{HOLE,DATA} offsets
18.01 SEEK_HOLE expected -1 or -1, got 0.                         FAIL
18.02 SEEK_DATA expected -1 with errno -6, got -22.               FAIL

seek sanity check failed!

Cheers,
-- 
Luís