On Tue, May 15, 2018 at 10:07 AM, <xiang.dai@xxxxxxxxxxx> wrote:
> Hi, all!
>
> I use rbd to do something and find below issue:
>
> when i create a rbd image with feature:
> layering,exclusive-lock,object-map,fast-diff
>
> failed to map:
> rbd: sysfs write failed
> RBD image feature set mismatch. Try disabling features unsupported by the
> kernel with "rbd feature disable".
> In some cases useful info is found in syslog - try "dmesg | tail".
> rbd: map failed: (6) No such device or address
>
> dmesg | tail:
> [960284.869596] rbd: rbd0: capacity 107374182400 features 0x5
> [960310.908615] libceph: mon1 10.0.10.12:6789 session established
> [960310.908916] libceph: client21459 fsid
> fe308030-ae94-471a-8d52-2c12151262fc
> [960310.911729] rbd: image foo: image uses unsupported features: 0x18
> [960337.946856] libceph: mon1 10.0.10.12:6789 session established
> [960337.947320] libceph: client21465 fsid
> fe308030-ae94-471a-8d52-2c12151262fc
> [960337.950116] rbd: image foo: image uses unsupported features: 0x8
> [960346.248676] libceph: mon0 10.0.10.11:6789 session established
> [960346.249077] libceph: client21866 fsid
> fe308030-ae94-471a-8d52-2c12151262fc
> [960346.254145] rbd: rbd0: capacity 107374182400 features 0x5
>
> If i just create layering image, map is ok.
>
> *The question is here:*
>
> Then i enable feature:
> exclusive-lock,object-map,fast-diff
>
> It works.
>
> And rbd info shows all feature i set.
>
> I think it is a bug:
>
> why create with those feature then map failed but map after create is ok?
Yes, it is a bug. There is a patch pending from Dongsheng, so it will
be fixed in 4.18.
If you are told that these features are unsupported, you shouldn't be
looking for backdoor ways to enable them ;)
Thanks,
Ilya
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