ceph: force sending a cap update msg back to MDS for revoke op

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If a client sends out a cap update dropping caps with the prior 'seq'
just before an incoming cap revoke request, then the client may drop
the revoke because it believes it's already released the requested
capabilities.

This causes the MDS to wait indefinitely for the client to respond
to the revoke. It's therefore always a good idea to ack the cap
revoke request with the bumped up 'seq'.

Currently if the cap->issued equals to the newcaps the check_caps()
will do nothing, we should force flush the caps.

Cc: stable@vger.kernel.org
Link: https://tracker.ceph.com/issues/61782
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

...

This commit is contained in:

Xiubo Li 2024-07-12 12:40:19 +08:00 • committed by Ilya Dryomov

parent 8400291e28

commit 31634d7597

2 changed files with 28 additions and 14 deletions

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35

fs/ceph/caps.c

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7

fs/ceph/super.h

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