Re: [GIT PULL] Ceph fixes for -rc7

[NeilBrown <neilb@suse.com>]

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On Wed, Mar 30 2016, Yan, Zheng wrote:

> On Wed, Mar 30, 2016 at 8:24 AM, NeilBrown <neilb@suse.com> wrote:
>> On Fri, Mar 25 2016, Ilya Dryomov wrote:
>>
>>> On Fri, Mar 25, 2016 at 5:02 AM, NeilBrown <neilb@suse.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
>

Ahhh..  I do wonder at the point of feature flags if they don't let you
run any client with any server...
Is there a compatability matrix published somewhere?
If I have to stay with 10.0.5 (I don't know yet), it is safe to use
Linux-4.4 code?

Thanks,
NeilBrown

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