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lvmlockd: retry on other sanlock errors

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These less common errors returned from sanlock should
also cause sanlock to retry the lock acquire:

- i/o timeout occurs during sanlock_acquire().
  other i/o on the same disk as the leases can cause
  sanlock i/o timeouts.

- low level disk paxos contention between hosts naturally
  causes one host to not acquire the lease.  There are a
  couple special error numbers associated with these cases
  that should just be recognized as a normal failure to
  acquire the lease.
This commit is contained in:
David Teigland 2017-11-15 15:34:42 -06:00
parent 115e66e9be
commit e52d2e3bd8
1 changed files with 20 additions and 0 deletions
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20
daemons/lvmlockd/lvmlockd-sanlock.c
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@ -1528,6 +1528,26 @@ int lm_lock_sanlock(struct lockspace *ls, struct resource *r, int ld_mode,
return -EAGAIN;
}
if (rv == SANLK_AIO_TIMEOUT) {
/*
* sanlock got an i/o timeout when trying to acquire the
* lease on disk.
*/
log_debug("S %s R %s lock_san acquire mode %d rv %d", ls->name, r->name, ld_mode, rv);
*retry = 0;
return -EAGAIN;
}
if (rv == SANLK_DBLOCK_LVER || rv == SANLK_DBLOCK_MBAL) {
/*
* There was contention with another host for the lease,
* and we lost.
*/
log_debug("S %s R %s lock_san acquire mode %d rv %d", ls->name, r->name, ld_mode, rv);
*retry = 0;
return -EAGAIN;
}
if (rv == SANLK_ACQUIRE_OWNED_RETRY) {
/*
* The lock is held by a failed host, and will eventually