samba vfs_ceph: client_mds_namespace not working?

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Dear all,

maybe someone has experienced this before. We are setting up a SAMBA gateway and would like to use the vfs_ceph module. In case of several file systems one needs to choose an mds namespace. There is an option in ceph.conf:

  client mds namespace = CEPH-FS-NAME

Unfortunately, it seems not to work. I tried it in all possible versions, in [global] and [client], with and without "client" at the beginning, to no avail. I either get a time out or an error. I also found the libcephfs function

  ceph_select_filesystem(cmount, CEPH-FS-NAME)

added it to vfs_ceph.c just before the ceph_mount with the same result, I get an error (operation not permitted). Does anyone know how to get this to work? And, yes, I tested an ordinary kernel fs mount with the credentials for the ceph client without problems.

I can't access any documentation on the libcephfs api, I always get a page not found error.

My last resort is now to

  ceph fs set-default CEPH-FS-NAME

to the fs to be used and live with the implied restrictions and ugliness.

Best regards,
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
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