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Date:	Wed, 30 Mar 2016 10:30:31 +0800
From:	"Yan, Zheng" <ukernel@...il.com>
To:	NeilBrown <neilb@...e.com>
Cc:	Ilya Dryomov <idryomov@...il.com>, Sage Weil <sweil@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ceph Development <ceph-devel@...r.kernel.org>
Subject: Re: [GIT PULL] Ceph fixes for -rc7

On Wed, Mar 30, 2016 at 8:24 AM, NeilBrown <neilb@...e.com> wrote:
> 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 ??

Sorry, cephfs in linux 4.5 does not work with 10.0.5. Please upgrade
to ceph 10.1.0

Regards
Yan, Zheng

>
> Thanks,
> NeilBrown

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