APPLIED(F): [SRU][F][G][PATCH 0/1] ceph -- Unable to mount ceph volume on s390x (LP: 1875863)

[Khaled Elmously]

On 2020-05-11 11:02:31 , frank.heimes at canonical.com wrote:
> Buglink: https://bugs.launchpad.net/bugs/1875863
> 
> SRU Justification:
> 
> [Impact]
> 
> * Unable to mount ceph volumes on big endian systems, like s390x.
> 
> * The mount operation always fails with an IO error.
> 
> * This is caused by an endiness issue in function handle_session where variable features is always little endian.
> 
> * But test_bit assumes the host order of bytes, hence causes a problem on big endian systems.
> 
> [Fix]
> 
> * 0fa8263367db9287aa0632f96c1a5f93cc478150 0fa8263367db "ceph: fix endianness bug when handling MDS session feature bits"
> 
> [Test Case]
> 
> * Setup ceph on s390x.
> 
> * Try to mount a ceph volume.
> 
> * If it mounts correctly the patch is applied and working.
> 
> * Without the patch a mount always fails on big endian / s390x.
> 
> [Regression Potential] 
> 
> * There is regression potential with having code changes in ceph's session handler, which is common code.
> 
> * However, the patch was accepted (slightly changed) by the ceph maintainers and with that got upstream accepted, too.
> 
> * The patch is fairly limited (5 lines removed, 3 added), hence the changes are quite traceable.
> 
> Jeff Layton (1):
>   From: Jeff Layton <jlayton at kernel.org>
> 
>  fs/ceph/mds_client.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> -- 
> 2.25.1
> 
> 
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