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Backport the overlayfs xwhiteout format change

Alexander Larsson requested to merge alexlarsson/cs-9-kernel:finish-ovl-nesting-backport into main

As was requested in !3577 (comment 1730494093) upstream changed the format of the overlayfs whiteout nesting, and we now need to backport this to complete the support in cs9.

The required backport is 420332b94119cdc7db4477cc88484691cb92ae71, but this also includes the documentation change in bb7055a7349904623fe489b4461e12803da18ce6 to avoid conflicts.

I tested this with the "for-next" branch of xfstest which has a test for this functionality (overlay/084). Note: This test changed since the last MR with this commit: https://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git/commit/?h=for-next&id=c3eff0947047074fc99afa72297f017e39b94642 That makes the test work with the new xattr format.

JIRA: https://issues.redhat.com/browse/RHEL-25807

Signed-off-by: Alexander Larsson alexl@redhat.com

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