linux-kernel - Re: [GIT PULL] Ceph fixes for -rc7

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Message-ID: <874mbovmlv.fsf@notabene.neil.brown.name>
Date:	Wed, 30 Mar 2016 11:24:44 +1100
From:	NeilBrown <neilb@...e.com>
To:	Ilya Dryomov <idryomov@...il.com>
Cc:	Sage Weil <sweil@...hat.com>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	Ceph Development <ceph-devel@...r.kernel.org>
Subject: Re: [GIT PULL] Ceph fixes for -rc7

On Fri, Mar 25 2016, Ilya Dryomov wrote:

> On Fri, Mar 25, 2016 at 5:02 AM, NeilBrown <neilb@...e.com> wrote:
>> On Sun, Mar 06 2016, Sage Weil wrote:
>>
>>> Hi Linus,
>>>
>>> Please pull the following Ceph patch from
>>>
>>>   git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client.git for-linus
>>>
>>> This is a final commit we missed to align the protocol compatibility with
>>> the feature bits.  It decodes a few extra fields in two different messages
>>> and reports EIO when they are used (not yet supported).
>>>
>>> Thanks!
>>> sage
>>>
>>>
>>> ----------------------------------------------------------------
>>> Yan, Zheng (1):
>>>       ceph: initial CEPH_FEATURE_FS_FILE_LAYOUT_V2 support
>>
>> Just wondering, but was CEPH_FEATURE_FS_FILE_LAYOUT_V2 supposed to have
>> exactly the same value as CEPH_FEATURE_NEW_OSDOPREPLY_ENCODING (and
>> CEPH_FEATURE_CRUSH_TUNABLES5)??
>
> Yes, that was the point of getting it merged into -rc7.

I did wonder if that might be the case.

>
>> Because when I backported this patch (and many others) to some ancient
>> enterprise kernel, it caused mounts to fail.  If it really is meant to
>> be the same value, then I must have some other backported issue to find
>> and fix.
>
> It has to be backported in concert with changes that add support for
> the other two bits.

I have everything from fs/ceph and net/ceph as of 4.5, with adjustments
for different core code.

>                      How did mount fail?

"can't read superblock".
dmesg contains

[   50.822479] libceph: client144098 fsid 2b73bc29-3e78-490a-8fc6-21da1bf901ba
[   50.823746] libceph: mon0 192.168.1.122:6789 session established
[   51.635312] ceph: problem parsing mds trace -5
[   51.635317] ceph: mds parse_reply err -5
[   51.635318] ceph: mdsc_handle_reply got corrupt reply mds0(tid:1)

then a hex dump of header:, front: footer:

Maybe my MDS is causing the problem?  It is based on v10.0.5 which
contains

#define CEPH_FEATURE_CRUSH_TUNABLES5    (1ULL<<58) /* chooseleaf stable mode */
// duplicated since it was introduced at the same time as CEPH_FEATURE_CRUSH_TUN
#define CEPH_FEATURE_NEW_OSDOPREPLY_ENCODING   (1ULL<<58) /* New, v7 encoding */

in ceph_features.h  i.e. two features using bit 58, but not
FS_FILE_LAYOUT_V2

Should I expect Linux 4.5 to work with ceph 10.0.5 ??

Thanks,
NeilBrown

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