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When receiving NLM_GRANTED_RES or NLM4_GRANTED_RES lock granted messages

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from the NFS server, following contention on a lock by this or another
client, immediately notify the waiting process that the lock has been
granted via a wakeup.  Without this change, the client rpc.lockd will
not wakeup the waiting process until it next re-polls the lock (sometime
in the next ten seconds), which can lead to marked latency across all
potential lockers, as the lock is held by the client for the duration.

Approved by:	re (scottl)
Submitted by:	truckman
Reviewed by:	Andrew P. Lentvorski, Jr <bsder@allcaps.org>
This commit is contained in:
Robert Watson 2003-05-14 13:50:40 +00:00
parent 5adbf8fb4d
commit 1870b993d0
1 changed files with 7 additions and 2 deletions
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9
usr.sbin/rpc.lockd/lock_proc.c
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@ -695,7 +695,10 @@ nlm_granted_msg_1_svc(arg, rqstp)
log_from_addr("nlm_granted_msg", rqstp);
res.cookie = arg->cookie;
res.stat.stat = nlm_granted;
res.stat.stat = lock_answer(arg->alock.svid, &arg->cookie,
nlm_granted, NULL, NLM_VERS) == 0 ?
nlm_granted : nlm_denied;
transmit_result(NLM_GRANTED_RES, &res,
(struct sockaddr *)svc_getcaller(rqstp->rq_xprt));
return (NULL);
@ -1184,7 +1187,9 @@ nlm4_granted_msg_4_svc(arg, rqstp)
log_from_addr("nlm4_granted_msg", rqstp);
res.cookie = arg->cookie;
res.stat.stat = nlm4_granted;
res.stat.stat = lock_answer(arg->alock.svid, &arg->cookie,
nlm4_granted, NULL, NLM_VERS4) == 0 ?
nlm4_granted : nlm4_denied;
transmit4_result(NLM4_GRANTED_RES, &res,
(struct sockaddr *)svc_getrpccaller(rqstp->rq_xprt)->buf);
return (NULL);