On Fri, Jan 17, 2020 at 2:21 AM Aaron <aarongmldt@xxxxxxxxx> wrote:
>
> No worries, can definitely do that.
>
> Cheers
> Aaron
>
> On Thu, Jan 16, 2020 at 8:08 PM Jeff Layton <jlayton@xxxxxxxxxx> wrote:
>>
>> On Thu, 2020-01-16 at 18:42 -0500, Jeff Layton wrote:
>> > On Wed, 2020-01-15 at 08:05 -0500, Aaron wrote:
>> > > Seeing a weird mount issue. Some info:
>> > >
>> > > No LSB modules are available.
>> > > Distributor ID: Ubuntu
>> > > Description: Ubuntu 18.04.3 LTS
>> > > Release: 18.04
>> > > Codename: bionic
>> > >
>> > > Ubuntu 18.04.3 with kerne 4.15.0-74-generic
>> > > Ceph 14.2.5 & 14.2.6
>> > >
>> > > With ceph-common, ceph-base, etc installed:
>> > >
>> > > ceph/stable,now 14.2.6-1bionic amd64 [installed]
>> > > ceph-base/stable,now 14.2.6-1bionic amd64 [installed]
>> > > ceph-common/stable,now 14.2.6-1bionic amd64 [installed,automatic]
>> > > ceph-mds/stable,now 14.2.6-1bionic amd64 [installed]
>> > > ceph-mgr/stable,now 14.2.6-1bionic amd64 [installed,automatic]
>> > > ceph-mgr-dashboard/stable,stable,now 14.2.6-1bionic all [installed]
>> > > ceph-mon/stable,now 14.2.6-1bionic amd64 [installed]
>> > > ceph-osd/stable,now 14.2.6-1bionic amd64 [installed]
>> > > libcephfs2/stable,now 14.2.6-1bionic amd64 [installed,automatic]
>> > > python-ceph-argparse/stable,stable,now 14.2.6-1bionic all [installed,automatic]
>> > > python-cephfs/stable,now 14.2.6-1bionic amd64 [installed,automatic]
>> > >
>> > > I create a user via get-or-create cmd, and I have a users/secret now.
>> > > When I try to mount on these Ubuntu nodes,
>> > >
>> > > The mount cmd I run for testing is:
>> > > sudo mount -t ceph -o
>> > > name=user-20c5338c-34db-11ea-b27a-de7033e905f6,secret=AQC6dhpeyczkDxAAhRcr7oERUY4BcD2NCUkuNg==
>> > > 10.10.10.10:6789:/work/20c5332d-34db-11ea-b27a-de7033e905f6 /tmp/test
>> > >
>> > > I get the error:
>> > > couldn't finalize options: -34
>> > >
>> > > From some tracking down, it's part of the get_secret_option() in
>> > > common/secrets.c and the Linux System Error:
>> > >
>> > > #define ERANGE 34 /* Math result not representable */
>> > >
>> > > Now the weird part...when I remove all the above libs above, the mount
>> > > command works. I know that there are ceph.ko modules in the Ubuntu
>> > > filesystems DIR, and that Ubuntu comes with some understanding of how
>> > > to mount a cephfs system. So, that explains how it can mount
>> > > cephfs...but, what I don't understand is why I'm getting that -34
>> > > error with the 14.2.5 and 14.2.6 libs installed. I didn't have this
>> > > issue with 14.2.3 or 14.2.4.
>> >
>> > This sounds like a regression in mount.ceph, probably due to something
>> > that went in for v14.2.5. I can reproduce the problem on Fedora, and I
>> > think it has something to do with the very long username you're using.
>> >
>> > I'll take a closer look and let you know. Stay tuned.
>> >
>>
>> I think I see the issue. The SECRET_OPTION_BUFSIZE is just too small for
>> your use case. We need to make that a little larger than the largest
>> name= parameter can be. Prior to v14.2.5, it was ~1000 bytes, but I made
>> it smaller in that set thinking that was too large. Mea culpa.
>>
>> The problem is determining how big that size can be. AFAICT EntityName
>> is basically a std::string in the ceph code, which can be an arbitrary
>> size (up to 4g or so).
It's just that you made SECRET_OPTION_BUFSIZE account precisely for
"secret=<base64 secret>", but it can also be "key=<username>".
I don't think there is much of a problem. Defining it back to ~1000 is
guaranteed to work. Or we could remove it and just compute the size of
secret_option exactly the same way as get_secret_option() does it:
strlen(cmi->cmi_secret) + strlen(cmi->cmi_name) + 7 + 1
Thanks,
Ilya
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