2 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
3 * Authors: Doug Rabson <dfr@rabson.org>
4 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
32 #include <sys/fcntl.h>
34 #include <sys/kernel.h>
35 #include <sys/limits.h>
37 #include <sys/lockf.h>
38 #include <sys/malloc.h>
40 #include <sys/mount.h>
41 #include <sys/mutex.h>
43 #include <sys/socket.h>
44 #include <sys/syslog.h>
45 #include <sys/systm.h>
46 #include <sys/unistd.h>
47 #include <sys/vnode.h>
49 #include <nfs/nfsproto.h>
50 #include <nfsclient/nfs.h>
51 #include <nfsclient/nfsmount.h>
53 #include <nlm/nlm_prot.h>
57 * We need to keep track of the svid values used for F_FLOCK locks.
59 struct nlm_file_svid {
60 int ns_refs; /* thread count + 1 if active */
61 int ns_svid; /* on-the-wire SVID for this file */
62 struct ucred *ns_ucred; /* creds to use for lock recovery */
63 void *ns_id; /* local struct file pointer */
64 bool_t ns_active; /* TRUE if we own a lock */
65 LIST_ENTRY(nlm_file_svid) ns_link;
67 LIST_HEAD(nlm_file_svid_list, nlm_file_svid);
69 #define NLM_SVID_HASH_SIZE 256
70 struct nlm_file_svid_list nlm_file_svids[NLM_SVID_HASH_SIZE];
72 struct mtx nlm_svid_lock;
73 static struct unrhdr *nlm_svid_allocator;
74 static volatile u_int nlm_xid = 1;
76 static int nlm_setlock(struct nlm_host *host, struct rpc_callextra *ext,
77 rpcvers_t vers, struct timeval *timo, int retries,
78 struct vnode *vp, int op, struct flock *fl, int flags,
79 int svid, size_t fhlen, void *fh, off_t size, bool_t reclaim);
80 static int nlm_clearlock(struct nlm_host *host, struct rpc_callextra *ext,
81 rpcvers_t vers, struct timeval *timo, int retries,
82 struct vnode *vp, int op, struct flock *fl, int flags,
83 int svid, size_t fhlen, void *fh, off_t size);
84 static int nlm_getlock(struct nlm_host *host, struct rpc_callextra *ext,
85 rpcvers_t vers, struct timeval *timo, int retries,
86 struct vnode *vp, int op, struct flock *fl, int flags,
87 int svid, size_t fhlen, void *fh, off_t size);
88 static int nlm_map_status(nlm4_stats stat);
89 static struct nlm_file_svid *nlm_find_svid(void *id);
90 static void nlm_free_svid(struct nlm_file_svid *nf);
91 static int nlm_init_lock(struct flock *fl, int flags, int svid,
92 rpcvers_t vers, size_t fhlen, void *fh, off_t size,
93 struct nlm4_lock *lock, char oh_space[32]);
96 nlm_client_init(void *dummy)
100 mtx_init(&nlm_svid_lock, "NLM svid lock", NULL, MTX_DEF);
101 /* pid_max cannot be greater than PID_MAX */
102 nlm_svid_allocator = new_unrhdr(PID_MAX + 2, INT_MAX, &nlm_svid_lock);
103 for (i = 0; i < NLM_SVID_HASH_SIZE; i++)
104 LIST_INIT(&nlm_file_svids[i]);
106 SYSINIT(nlm_client_init, SI_SUB_LOCK, SI_ORDER_FIRST, nlm_client_init, NULL);
109 nlm_msg(struct thread *td, const char *server, const char *msg, int error)
113 p = td ? td->td_proc : NULL;
115 tprintf(p, LOG_INFO, "nfs server %s: %s, error %d\n", server,
118 tprintf(p, LOG_INFO, "nfs server %s: %s\n", server, msg);
123 struct nlm_feedback_arg {
125 struct nfsmount *nf_nmp;
129 nlm_down(struct nlm_feedback_arg *nf, struct thread *td,
130 const char *msg, int error)
132 struct nfsmount *nmp = nf->nf_nmp;
136 mtx_lock(&nmp->nm_mtx);
137 if (!(nmp->nm_state & NFSSTA_LOCKTIMEO)) {
138 nmp->nm_state |= NFSSTA_LOCKTIMEO;
139 mtx_unlock(&nmp->nm_mtx);
140 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
143 mtx_unlock(&nmp->nm_mtx);
146 nf->nf_printed = TRUE;
147 nlm_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, error);
151 nlm_up(struct nlm_feedback_arg *nf, struct thread *td,
154 struct nfsmount *nmp = nf->nf_nmp;
159 nlm_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, 0);
161 mtx_lock(&nmp->nm_mtx);
162 if (nmp->nm_state & NFSSTA_LOCKTIMEO) {
163 nmp->nm_state &= ~NFSSTA_LOCKTIMEO;
164 mtx_unlock(&nmp->nm_mtx);
165 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
168 mtx_unlock(&nmp->nm_mtx);
173 nlm_feedback(int type, int proc, void *arg)
175 struct thread *td = curthread;
176 struct nlm_feedback_arg *nf = (struct nlm_feedback_arg *) arg;
179 case FEEDBACK_REXMIT2:
180 case FEEDBACK_RECONNECT:
181 nlm_down(nf, td, "lockd not responding", 0);
185 nlm_up(nf, td, "lockd is alive again");
192 * NFS advisory byte-level locks.
195 nlm_advlock_internal(struct vnode *vp, void *id, int op, struct flock *fl,
196 int flags, bool_t reclaim, bool_t unlock_vp)
198 struct thread *td = curthread;
199 struct nfsmount *nmp;
204 struct sockaddr_storage ss;
209 struct nlm_host *host;
210 struct rpc_callextra ext;
211 struct nlm_feedback_arg nf;
213 struct ucred *cred, *cred1;
214 struct nlm_file_svid *ns;
219 ASSERT_VOP_LOCKED(vp, "nlm_advlock_1");
221 servername = malloc(MNAMELEN, M_TEMP, M_WAITOK); /* XXXKIB vp locked */
222 nmp = VFSTONFS(vp->v_mount);
224 * Push any pending writes to the server and flush our cache
225 * so that if we are contending with another machine for a
226 * file, we get whatever they wrote and vice-versa.
228 if (op == F_SETLK || op == F_UNLCK)
229 nmp->nm_vinvalbuf(vp, V_SAVE, td, 1);
231 strcpy(servername, nmp->nm_hostname);
232 nmp->nm_getinfo(vp, fh.fh_bytes, &fhlen, &ss, &is_v3, &size, &timo);
233 sa = (struct sockaddr *) &ss;
239 if (nmp->nm_flag & NFSMNT_SOFT)
240 retries = nmp->nm_retry;
245 * We need to switch to mount-point creds so that we can send
246 * packets from a privileged port. Reference mnt_cred and
247 * switch to them before unlocking the vnode, since mount
248 * point could be unmounted right after unlock.
251 td->td_ucred = vp->v_mount->mnt_cred;
252 crhold(td->td_ucred);
256 host = nlm_find_host_by_name(servername, sa, vers);
257 auth = authunix_create(cred);
258 memset(&ext, 0, sizeof(ext));
260 nf.nf_printed = FALSE;
264 ext.rc_feedback = nlm_feedback;
265 ext.rc_feedback_arg = &nf;
266 ext.rc_timers = NULL;
269 if (flags & F_FLOCK) {
270 ns = nlm_find_svid(id);
271 KASSERT(fl->l_start == 0 && fl->l_len == 0,
272 ("F_FLOCK lock requests must be whole-file locks"));
275 * Remember the creds used for locking in case
276 * we need to recover the lock later.
278 ns->ns_ucred = crdup(cred);
281 } else if (flags & F_REMOTE) {
283 * If we are recovering after a server restart or
284 * trashing locks on a force unmount, use the same
289 svid = ((struct proc *) id)->p_pid;
294 if ((flags & (F_FLOCK|F_WAIT)) == (F_FLOCK|F_WAIT)
295 && fl->l_type == F_WRLCK) {
297 * The semantics for flock(2) require that any
298 * shared lock on the file must be released
299 * before an exclusive lock is granted. The
300 * local locking code interprets this by
301 * unlocking the file before sleeping on a
302 * blocked exclusive lock request. We
303 * approximate this by first attempting
304 * non-blocking and if that fails, we unlock
305 * the file and block.
307 error = nlm_setlock(host, &ext, vers, &timo, retries,
308 vp, F_SETLK, fl, flags & ~F_WAIT,
309 svid, fhlen, &fh.fh_bytes, size, reclaim);
310 if (error == EAGAIN) {
311 fl->l_type = F_UNLCK;
312 error = nlm_clearlock(host, &ext, vers, &timo,
313 retries, vp, F_UNLCK, fl, flags,
314 svid, fhlen, &fh.fh_bytes, size);
315 fl->l_type = F_WRLCK;
317 mtx_lock(&nlm_svid_lock);
320 ns->ns_active = FALSE;
322 mtx_unlock(&nlm_svid_lock);
324 error = nlm_setlock(host, &ext, vers,
325 &timo, retries, vp, F_SETLK, fl,
326 flags, svid, fhlen, &fh.fh_bytes,
331 error = nlm_setlock(host, &ext, vers, &timo, retries,
332 vp, op, fl, flags, svid, fhlen, &fh.fh_bytes,
336 mtx_lock(&nlm_svid_lock);
337 if (!ns->ns_active) {
339 * Add one to the reference count to
340 * hold onto the SVID for the lifetime
341 * of the lock. Note that since
342 * F_FLOCK only supports whole-file
343 * locks, there can only be one active
344 * lock for this SVID.
347 ns->ns_active = TRUE;
349 mtx_unlock(&nlm_svid_lock);
354 error = nlm_clearlock(host, &ext, vers, &timo, retries,
355 vp, op, fl, flags, svid, fhlen, &fh.fh_bytes, size);
357 mtx_lock(&nlm_svid_lock);
360 ns->ns_active = FALSE;
362 mtx_unlock(&nlm_svid_lock);
367 error = nlm_getlock(host, &ext, vers, &timo, retries,
368 vp, op, fl, flags, svid, fhlen, &fh.fh_bytes, size);
379 cred1 = td->td_ucred;
384 nlm_host_release(host);
385 free(servername, M_TEMP);
390 nlm_advlock(struct vop_advlock_args *ap)
393 return (nlm_advlock_internal(ap->a_vp, ap->a_id, ap->a_op, ap->a_fl,
394 ap->a_flags, FALSE, TRUE));
398 * Set the creds of td to the creds of the given lock's owner. The new
399 * creds reference count will be incremented via crhold. The caller is
400 * responsible for calling crfree and restoring td's original creds.
403 nlm_set_creds_for_lock(struct thread *td, struct flock *fl)
406 struct nlm_file_svid *ns;
411 if (fl->l_pid > PID_MAX) {
413 * If this was originally a F_FLOCK-style lock, we
414 * recorded the creds used when it was originally
415 * locked in the nlm_file_svid structure.
417 mtx_lock(&nlm_svid_lock);
418 for (i = 0; i < NLM_SVID_HASH_SIZE; i++) {
419 for (ns = LIST_FIRST(&nlm_file_svids[i]); ns;
420 ns = LIST_NEXT(ns, ns_link)) {
421 if (ns->ns_svid == fl->l_pid) {
422 cred = crhold(ns->ns_ucred);
427 mtx_unlock(&nlm_svid_lock);
430 * This lock is owned by a process. Get a reference to
433 p = pfind(fl->l_pid);
435 cred = crhold(p->p_ucred);
441 * If we can't find a cred, fall back on the recovery
445 cred = crhold(td->td_ucred);
452 nlm_reclaim_free_lock(struct vnode *vp, struct flock *fl, void *arg)
455 struct thread *td = curthread;
456 struct ucred *oldcred;
460 newfl.l_type = F_UNLCK;
462 oldcred = td->td_ucred;
463 nlm_set_creds_for_lock(td, &newfl);
465 error = nlm_advlock_internal(vp, NULL, F_UNLCK, &newfl, F_REMOTE,
468 crfree(td->td_ucred);
469 td->td_ucred = oldcred;
475 nlm_reclaim(struct vop_reclaim_args *ap)
478 nlm_cancel_wait(ap->a_vp);
479 lf_iteratelocks_vnode(ap->a_vp, nlm_reclaim_free_lock, NULL);
483 struct nlm_recovery_context {
484 struct nlm_host *nr_host; /* host we are recovering */
485 int nr_state; /* remote NSM state for recovery */
489 nlm_client_recover_lock(struct vnode *vp, struct flock *fl, void *arg)
491 struct nlm_recovery_context *nr = (struct nlm_recovery_context *) arg;
492 struct thread *td = curthread;
493 struct ucred *oldcred;
497 * If the remote NSM state changes during recovery, the host
498 * must have rebooted a second time. In that case, we must
499 * restart the recovery.
501 state = nlm_host_get_state(nr->nr_host);
502 if (nr->nr_state != state)
505 error = vn_lock(vp, LK_SHARED);
509 oldcred = td->td_ucred;
510 nlm_set_creds_for_lock(td, fl);
512 error = nlm_advlock_internal(vp, NULL, F_SETLK, fl, F_REMOTE,
515 crfree(td->td_ucred);
516 td->td_ucred = oldcred;
522 nlm_client_recovery(struct nlm_host *host)
524 struct nlm_recovery_context nr;
527 sysid = NLM_SYSID_CLIENT | nlm_host_get_sysid(host);
530 nr.nr_state = nlm_host_get_state(host);
531 error = lf_iteratelocks_sysid(sysid,
532 nlm_client_recover_lock, &nr);
533 } while (error == ERESTART);
537 nlm_convert_to_nlm_lock(struct nlm_lock *dst, struct nlm4_lock *src)
540 dst->caller_name = src->caller_name;
543 dst->svid = src->svid;
544 dst->l_offset = src->l_offset;
545 dst->l_len = src->l_len;
549 nlm_convert_to_nlm4_holder(struct nlm4_holder *dst, struct nlm_holder *src)
552 dst->exclusive = src->exclusive;
553 dst->svid = src->svid;
555 dst->l_offset = src->l_offset;
556 dst->l_len = src->l_len;
560 nlm_convert_to_nlm4_res(struct nlm4_res *dst, struct nlm_res *src)
562 dst->cookie = src->cookie;
563 dst->stat.stat = (enum nlm4_stats) src->stat.stat;
566 static enum clnt_stat
567 nlm_test_rpc(rpcvers_t vers, nlm4_testargs *args, nlm4_testres *res, CLIENT *client,
568 struct rpc_callextra *ext, struct timeval timo)
570 if (vers == NLM_VERS4) {
571 return nlm4_test_4(args, res, client, ext, timo);
577 args1.cookie = args->cookie;
578 args1.exclusive = args->exclusive;
579 nlm_convert_to_nlm_lock(&args1.alock, &args->alock);
580 memset(&res1, 0, sizeof(res1));
582 stat = nlm_test_1(&args1, &res1, client, ext, timo);
584 if (stat == RPC_SUCCESS) {
585 res->cookie = res1.cookie;
586 res->stat.stat = (enum nlm4_stats) res1.stat.stat;
587 if (res1.stat.stat == nlm_denied)
588 nlm_convert_to_nlm4_holder(
589 &res->stat.nlm4_testrply_u.holder,
590 &res1.stat.nlm_testrply_u.holder);
597 static enum clnt_stat
598 nlm_lock_rpc(rpcvers_t vers, nlm4_lockargs *args, nlm4_res *res, CLIENT *client,
599 struct rpc_callextra *ext, struct timeval timo)
601 if (vers == NLM_VERS4) {
602 return nlm4_lock_4(args, res, client, ext, timo);
608 args1.cookie = args->cookie;
609 args1.block = args->block;
610 args1.exclusive = args->exclusive;
611 nlm_convert_to_nlm_lock(&args1.alock, &args->alock);
612 args1.reclaim = args->reclaim;
613 args1.state = args->state;
614 memset(&res1, 0, sizeof(res1));
616 stat = nlm_lock_1(&args1, &res1, client, ext, timo);
618 if (stat == RPC_SUCCESS) {
619 nlm_convert_to_nlm4_res(res, &res1);
626 static enum clnt_stat
627 nlm_cancel_rpc(rpcvers_t vers, nlm4_cancargs *args, nlm4_res *res, CLIENT *client,
628 struct rpc_callextra *ext, struct timeval timo)
630 if (vers == NLM_VERS4) {
631 return nlm4_cancel_4(args, res, client, ext, timo);
637 args1.cookie = args->cookie;
638 args1.block = args->block;
639 args1.exclusive = args->exclusive;
640 nlm_convert_to_nlm_lock(&args1.alock, &args->alock);
641 memset(&res1, 0, sizeof(res1));
643 stat = nlm_cancel_1(&args1, &res1, client, ext, timo);
645 if (stat == RPC_SUCCESS) {
646 nlm_convert_to_nlm4_res(res, &res1);
653 static enum clnt_stat
654 nlm_unlock_rpc(rpcvers_t vers, nlm4_unlockargs *args, nlm4_res *res, CLIENT *client,
655 struct rpc_callextra *ext, struct timeval timo)
657 if (vers == NLM_VERS4) {
658 return nlm4_unlock_4(args, res, client, ext, timo);
660 nlm_unlockargs args1;
664 args1.cookie = args->cookie;
665 nlm_convert_to_nlm_lock(&args1.alock, &args->alock);
666 memset(&res1, 0, sizeof(res1));
668 stat = nlm_unlock_1(&args1, &res1, client, ext, timo);
670 if (stat == RPC_SUCCESS) {
671 nlm_convert_to_nlm4_res(res, &res1);
679 * Called after a lock request (set or clear) succeeded. We record the
680 * details in the local lock manager. Note that since the remote
681 * server has granted the lock, we can be sure that it doesn't
682 * conflict with any other locks we have in the local lock manager.
684 * Since it is possible that host may also make NLM client requests to
685 * our NLM server, we use a different sysid value to record our own
688 * Note that since it is possible for us to receive replies from the
689 * server in a different order than the locks were granted (e.g. if
690 * many local threads are contending for the same lock), we must use a
691 * blocking operation when registering with the local lock manager.
692 * We expect that any actual wait will be rare and short hence we
693 * ignore signals for this.
696 nlm_record_lock(struct vnode *vp, int op, struct flock *fl,
697 int svid, int sysid, off_t size)
699 struct vop_advlockasync_args a;
702 int error, stops_deferred;
708 a.a_flags = F_REMOTE|F_WAIT|F_NOINTR;
711 newfl.l_start = fl->l_start;
712 newfl.l_len = fl->l_len;
713 newfl.l_type = fl->l_type;
714 newfl.l_whence = fl->l_whence;
716 newfl.l_sysid = NLM_SYSID_CLIENT | sysid;
719 error = lf_advlockasync(&a, &vp->v_lockf, size);
720 if (error == EDEADLK) {
722 * Locks are associated with the processes and
723 * not with threads. Suppose we have two
724 * threads A1 A2 in one process, A1 locked
725 * file f1, A2 is locking file f2, and A1 is
726 * unlocking f1. Then remote server may
727 * already unlocked f1, while local still not
728 * yet scheduled A1 to make the call to local
729 * advlock manager. The process B owns lock on
730 * f2 and issued the lock on f1. Remote would
731 * grant B the request on f1, but local would
736 stops_deferred = sigdeferstop(SIGDEFERSTOP_OFF);
738 thread_suspend_check(0);
740 sigallowstop(stops_deferred);
741 } else if (error == EINTR) {
743 * lf_purgelocks() might wake up the lock
744 * waiter and removed our lock graph edges.
745 * There is no sense in re-trying recording
746 * the lock to the local manager after
754 KASSERT(error == 0 || error == ENOENT,
755 ("Failed to register NFS lock locally - error=%d", error));
759 nlm_setlock(struct nlm_host *host, struct rpc_callextra *ext,
760 rpcvers_t vers, struct timeval *timo, int retries,
761 struct vnode *vp, int op, struct flock *fl, int flags,
762 int svid, size_t fhlen, void *fh, off_t size, bool_t reclaim)
764 struct nlm4_lockargs args;
770 int retry, block, exclusive;
771 void *wait_handle = NULL;
774 memset(&args, 0, sizeof(args));
775 memset(&res, 0, sizeof(res));
777 block = (flags & F_WAIT) ? TRUE : FALSE;
778 exclusive = (fl->l_type == F_WRLCK);
780 error = nlm_init_lock(fl, flags, svid, vers, fhlen, fh, size,
781 &args.alock, oh_space);
785 args.exclusive = exclusive;
786 args.reclaim = reclaim;
787 args.state = nlm_nsm_state;
791 client = nlm_host_get_rpc(host, FALSE);
793 return (ENOLCK); /* XXX retry? */
796 wait_handle = nlm_register_wait_lock(&args.alock, vp);
798 xid = atomic_fetchadd_int(&nlm_xid, 1);
799 args.cookie.n_len = sizeof(xid);
800 args.cookie.n_bytes = (char*) &xid;
802 stat = nlm_lock_rpc(vers, &args, &res, client, ext, *timo);
804 CLNT_RELEASE(client);
806 if (stat != RPC_SUCCESS) {
808 nlm_deregister_wait_lock(wait_handle);
819 xdr_free((xdrproc_t) xdr_nlm4_res, &res);
821 if (block && res.stat.stat != nlm4_blocked)
822 nlm_deregister_wait_lock(wait_handle);
824 if (res.stat.stat == nlm4_denied_grace_period) {
826 * The server has recently rebooted and is
827 * giving old clients a change to reclaim
828 * their locks. Wait for a few seconds and try
831 error = tsleep(&args, PCATCH, "nlmgrace", retry);
832 if (error && error != EWOULDBLOCK)
840 if (block && res.stat.stat == nlm4_blocked) {
842 * The server should call us back with a
843 * granted message when the lock succeeds. In
844 * order to deal with broken servers, lost
845 * granted messages and server reboots, we
846 * will also re-try every few seconds.
848 error = nlm_wait_lock(wait_handle, retry);
849 if (error == EWOULDBLOCK) {
857 * We need to call the server to
858 * cancel our lock request.
860 nlm4_cancargs cancel;
862 memset(&cancel, 0, sizeof(cancel));
864 xid = atomic_fetchadd_int(&nlm_xid, 1);
865 cancel.cookie.n_len = sizeof(xid);
866 cancel.cookie.n_bytes = (char*) &xid;
867 cancel.block = block;
868 cancel.exclusive = exclusive;
869 cancel.alock = args.alock;
872 client = nlm_host_get_rpc(host, FALSE);
877 stat = nlm_cancel_rpc(vers, &cancel,
878 &res, client, ext, *timo);
880 CLNT_RELEASE(client);
882 if (stat != RPC_SUCCESS) {
888 * reboots. This means
894 pause("nlmcancel", 10*hz);
896 } while (stat != RPC_SUCCESS);
901 xdr_free((xdrproc_t) xdr_nlm4_res, &res);
903 switch (res.stat.stat) {
915 case nlm4_denied_grace_period:
918 * recently rebooted -
944 error = nlm_map_status(res.stat.stat);
947 if (!error && !reclaim) {
948 nlm_record_lock(vp, op, fl, args.alock.svid,
949 nlm_host_get_sysid(host), size);
950 nlm_host_monitor(host, 0);
958 nlm_clearlock(struct nlm_host *host, struct rpc_callextra *ext,
959 rpcvers_t vers, struct timeval *timo, int retries,
960 struct vnode *vp, int op, struct flock *fl, int flags,
961 int svid, size_t fhlen, void *fh, off_t size)
963 struct nlm4_unlockargs args;
971 memset(&args, 0, sizeof(args));
972 memset(&res, 0, sizeof(res));
974 error = nlm_init_lock(fl, flags, svid, vers, fhlen, fh, size,
975 &args.alock, oh_space);
980 client = nlm_host_get_rpc(host, FALSE);
982 return (ENOLCK); /* XXX retry? */
984 xid = atomic_fetchadd_int(&nlm_xid, 1);
985 args.cookie.n_len = sizeof(xid);
986 args.cookie.n_bytes = (char*) &xid;
988 stat = nlm_unlock_rpc(vers, &args, &res, client, ext, *timo);
990 CLNT_RELEASE(client);
992 if (stat != RPC_SUCCESS) {
1003 xdr_free((xdrproc_t) xdr_nlm4_res, &res);
1005 if (res.stat.stat == nlm4_denied_grace_period) {
1007 * The server has recently rebooted and is
1008 * giving old clients a change to reclaim
1009 * their locks. Wait for a few seconds and try
1012 error = tsleep(&args, PCATCH, "nlmgrace", 5*hz);
1013 if (error && error != EWOULDBLOCK)
1019 * If we are being called via nlm_reclaim (which will
1020 * use the F_REMOTE flag), don't record the lock
1021 * operation in the local lock manager since the vnode
1024 if (!(flags & F_REMOTE))
1025 nlm_record_lock(vp, op, fl, args.alock.svid,
1026 nlm_host_get_sysid(host), size);
1033 nlm_getlock(struct nlm_host *host, struct rpc_callextra *ext,
1034 rpcvers_t vers, struct timeval *timo, int retries,
1035 struct vnode *vp, int op, struct flock *fl, int flags,
1036 int svid, size_t fhlen, void *fh, off_t size)
1038 struct nlm4_testargs args;
1040 struct nlm4_testres res;
1043 enum clnt_stat stat;
1047 KASSERT(!(flags & F_FLOCK), ("unexpected F_FLOCK for F_GETLK"));
1049 memset(&args, 0, sizeof(args));
1050 memset(&res, 0, sizeof(res));
1052 exclusive = (fl->l_type == F_WRLCK);
1054 error = nlm_init_lock(fl, flags, svid, vers, fhlen, fh, size,
1055 &args.alock, oh_space);
1058 args.exclusive = exclusive;
1061 client = nlm_host_get_rpc(host, FALSE);
1063 return (ENOLCK); /* XXX retry? */
1065 xid = atomic_fetchadd_int(&nlm_xid, 1);
1066 args.cookie.n_len = sizeof(xid);
1067 args.cookie.n_bytes = (char*) &xid;
1069 stat = nlm_test_rpc(vers, &args, &res, client, ext, *timo);
1071 CLNT_RELEASE(client);
1073 if (stat != RPC_SUCCESS) {
1081 if (res.stat.stat == nlm4_denied_grace_period) {
1083 * The server has recently rebooted and is
1084 * giving old clients a change to reclaim
1085 * their locks. Wait for a few seconds and try
1088 xdr_free((xdrproc_t) xdr_nlm4_testres, &res);
1089 error = tsleep(&args, PCATCH, "nlmgrace", 5*hz);
1090 if (error && error != EWOULDBLOCK)
1095 if (res.stat.stat == nlm4_denied) {
1096 struct nlm4_holder *h =
1097 &res.stat.nlm4_testrply_u.holder;
1098 fl->l_start = h->l_offset;
1099 fl->l_len = h->l_len;
1100 fl->l_pid = h->svid;
1102 fl->l_type = F_WRLCK;
1104 fl->l_type = F_RDLCK;
1105 fl->l_whence = SEEK_SET;
1108 fl->l_type = F_UNLCK;
1111 xdr_free((xdrproc_t) xdr_nlm4_testres, &res);
1118 nlm_map_status(nlm4_stats stat)
1127 case nlm4_denied_nolocks:
1150 static struct nlm_file_svid *
1151 nlm_find_svid(void *id)
1153 struct nlm_file_svid *ns, *newns;
1156 h = (((uintptr_t) id) >> 7) % NLM_SVID_HASH_SIZE;
1158 mtx_lock(&nlm_svid_lock);
1159 LIST_FOREACH(ns, &nlm_file_svids[h], ns_link) {
1160 if (ns->ns_id == id) {
1165 mtx_unlock(&nlm_svid_lock);
1167 int svid = alloc_unr(nlm_svid_allocator);
1168 newns = malloc(sizeof(struct nlm_file_svid), M_NLM,
1172 newns->ns_svid = svid;
1173 newns->ns_ucred = NULL;
1174 newns->ns_active = FALSE;
1177 * We need to check for a race with some other
1178 * thread allocating a svid for this file.
1180 mtx_lock(&nlm_svid_lock);
1181 LIST_FOREACH(ns, &nlm_file_svids[h], ns_link) {
1182 if (ns->ns_id == id) {
1188 mtx_unlock(&nlm_svid_lock);
1189 free_unr(nlm_svid_allocator, newns->ns_svid);
1192 LIST_INSERT_HEAD(&nlm_file_svids[h], newns,
1195 mtx_unlock(&nlm_svid_lock);
1203 nlm_free_svid(struct nlm_file_svid *ns)
1206 mtx_lock(&nlm_svid_lock);
1209 KASSERT(!ns->ns_active, ("Freeing active SVID"));
1210 LIST_REMOVE(ns, ns_link);
1211 mtx_unlock(&nlm_svid_lock);
1212 free_unr(nlm_svid_allocator, ns->ns_svid);
1214 crfree(ns->ns_ucred);
1217 mtx_unlock(&nlm_svid_lock);
1222 nlm_init_lock(struct flock *fl, int flags, int svid,
1223 rpcvers_t vers, size_t fhlen, void *fh, off_t size,
1224 struct nlm4_lock *lock, char oh_space[32])
1229 if (fl->l_whence == SEEK_END) {
1231 || (fl->l_start > 0 && size > OFF_MAX - fl->l_start))
1233 start = size + fl->l_start;
1234 } else if (fl->l_whence == SEEK_SET || fl->l_whence == SEEK_CUR) {
1235 start = fl->l_start;
1241 if (fl->l_len < 0) {
1250 if (vers == NLM_VERS) {
1252 * Enforce range limits on V1 locks
1254 if (start > 0xffffffffLL || len > 0xffffffffLL)
1258 snprintf(oh_space, 32, "%d@", svid);
1259 oh_len = strlen(oh_space);
1260 getcredhostname(NULL, oh_space + oh_len, 32 - oh_len);
1261 oh_len = strlen(oh_space);
1263 memset(lock, 0, sizeof(*lock));
1264 lock->caller_name = prison0.pr_hostname;
1265 lock->fh.n_len = fhlen;
1266 lock->fh.n_bytes = fh;
1267 lock->oh.n_len = oh_len;
1268 lock->oh.n_bytes = oh_space;
1270 lock->l_offset = start;