[Bug 1899582] Re: ceph: fix inode number handling on arches with 32-bit ino_t

** Changed in: linux (Ubuntu Focal)
Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1899582

Title:
ceph: fix inode number handling on arches with 32-bit ino_t

Status in Ubuntu on IBM z Systems:
In Progress
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Focal:
Fix Committed
Status in linux source package in Groovy:
Fix Released

Bug description:
SRU Justification:
==================

[Impact]

* A problem occurs with 32-bit ino_t values on 64-bit architectures
(like s390x).

* Without this patch, cephfs kernel client does not work properly on
s390x: the initial symtom is missing the first created file/directory
on cephfs mount point as reported in
https://tracker.ceph.com/issues/46828.

[Fix]

* cherry-pick for groovy: ebce3eb2f7ef9f6ef01a60874ebd232450107c9a
ebce3eb2f7ef "ceph: fix inode number handling on arches with 32-bit
ino_t"

* backport for focal: https://launchpadlibrarian.net/501822049/0001
-ceph-fix-inode-number-handling-on-arches-with-32-bit.patch

[Test Case]

* IBM Development team and Test team have carried out simple testing
and stress testing by automatically creating many Ceph clusters on
s390x (with different configuration each time), doing the cephfs
kernel mounting, checking inode numbers, running stress tests. The
same procedures were done on x86_64 arch by Test team.

[Regression Potential]

* There is a certain regression risk with this patch, since:

* common ceph filesystem code in fs/ceph/ is modified

* the inode handling is touched

* ceph is used for supplemental volumes

* and as the original author of this patch (Jeff Layton) wrote in the
commit message, the potential issue might happen on 32-bit arches only
and he also provided workaround for those arches.

[Other]

* The above patch/commit was upstream accepted with kernel 5.9.

* Cherry picking the patch/commit to groovy works fine, hence this
SRU.

* For focal a cherry pick does not apply cleanly, hence a backport got
added to LP 1899582.

__________

Backport provided for git-commit to 20.04 kernel.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ebce3eb2f7ef9f6ef01a60874ebd232450107c9a

Backport patch attached for commit ebce3eb upstream.

It was applied and tested on top of Ubuntu commit :

linux (5.4.0-48.52) focal; urgency=medium

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