[Bug 1875863] [NEW] ceph -- Unable to mount ceph volume on s390x

[Launchpad Bug Tracker]

You have been subscribed to a public bug:

When mounting a ceph volume, mount operation fails with an IO error.
The problem is always reproducible.

Identified potential root cause as kernel endian bug:

In the function handle_session() variable @features always
contains little endian order of bytes. Just because The feature
mask sent by the MDS is little-endian (bits are packed bytewise
from left to right in encode_supported_features()).

However, test_bit(), called to check features availability, assumes
the host order of bytes in that variable. This leads to problems on
big endian architectures. Specifically it is impossible to mount
ceph volume on s390.

A fixup was proposed to convert little-endian order of bytes to the host
one. That fixup was modified by ceph maintainers to use existing
unpacking means for the conversion. The resulted patch attached.

Related discussion in the ceph-development mailing list:
https://marc.info/?l=ceph-devel&m=158815357301332&w=2

** Affects: ceph (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s39064 bugnameltc-185690 severity-high targetmilestone-inin2004
-- 
ceph -- Unable to mount ceph volume on s390x
https://bugs.launchpad.net/bugs/1875863
You received this bug notification because you are a member of Ubuntu OpenStack, which is subscribed to ceph in Ubuntu.