ceph vfs

Sam Lang slang at inktank.com
Tue Apr 16 13:22:36 MDT 2013

On Tue, Apr 16, 2013 at 1:50 PM, Jeremy Allison <jra at samba.org> wrote:
> On Tue, Apr 16, 2013 at 10:13:46AM -0700, Jeremy Allison wrote:
>> On Tue, Apr 16, 2013 at 10:51:13AM -0500, Sam Lang wrote:
>> > I still have one failing test from smbtorture on the ceph vfs module.
>> > base.open.ctemp test fails with EPERM.  It looks like reply_ctemp() in
>> > source3/smbd/reply.c is doing a mkstemp with the path returned by
>> > realpath, so in the ceph case, its doing:  mkstemp("//TMXXXXXX")
>> >
>> > Unsurprisingly, that fails.  On a local filesystem (such as a
>> > directory like /tmp/foo), realpath resolves the path to
>> > /tmp/foo/TMXXXXXX.  But with ceph, no separate mountpoint exists
>> > locally.  How is ctemp meant to be handled by backend vfs modules that
>> > don't have a separate mount running on the smbd server?
>> Oh, you just found a bug in the VFS :-). Thanks !
>> reply_ctemp() is a *really* old DOS-style call
>> that no modern clients do.
> Just to be clear, there are vendors shipping
> cloud gateway products that also have no local
> mounts that have never run into this problem,
> so it's not an issue in actual customer deployments.

Ok great.  Thanks for letting me know.  I'll send patches shortly.

> Jeremy.

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