rbd: don't assume rbd_is_lock_owner() for exclusive mappings

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commit 3ceccb14f5 upstream.

Expanding on the previous commit, assuming that rbd_is_lock_owner()
always returns true (i.e. that we are either in RBD_LOCK_STATE_LOCKED
or RBD_LOCK_STATE_QUIESCING) if the mapping is exclusive is wrong too.
In case ceph_cls_set_cookie() fails, the lock would be temporarily
released even if the mapping is exclusive, meaning that we can end up
even in RBD_LOCK_STATE_UNLOCKED.

IOW, exclusive mappings are really "just" about disabling automatic
lock transitions (as documented in the man page), not about grabbing
the lock and holding on to it whatever it takes.

Cc: stable@vger.kernel.org
Fixes: 637cd06053 ("rbd: new exclusive lock wait/wake code")
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Dongsheng Yang <dongsheng.yang@easystack.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Ilya Dryomov 2024-07-23 18:08:08 +02:00 • committed by Greg Kroah-Hartman

parent 22cc7f013a

commit cfc2304e5c

1 changed files with 0 additions and 5 deletions

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drivers/block/rbd.c

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