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;
205 char servername[MNAMELEN];
209 struct nlm_host *host;
210 struct rpc_callextra ext;
211 struct nlm_feedback_arg nf;
214 struct nlm_file_svid *ns;
219 ASSERT_VOP_LOCKED(vp, "nlm_advlock_1");
221 nmp = VFSTONFS(vp->v_mount);
223 * Push any pending writes to the server and flush our cache
224 * so that if we are contending with another machine for a
225 * file, we get whatever they wrote and vice-versa.
227 if (op == F_SETLK || op == F_UNLCK)
228 nmp->nm_vinvalbuf(vp, V_SAVE, td, 1);
230 strcpy(servername, nmp->nm_hostname);
231 nmp->nm_getinfo(vp, fh.fh_bytes, &fhlen, &ss, &is_v3, &size, &timo);
232 sa = (struct sockaddr *) &ss;
238 if (nmp->nm_flag & NFSMNT_SOFT)
239 retries = nmp->nm_retry;
247 * We need to switch to mount-point creds so that we can send
248 * packets from a privileged port.
251 td->td_ucred = vp->v_mount->mnt_cred;
253 host = nlm_find_host_by_name(servername, sa, vers);
254 auth = authunix_create(cred);
255 memset(&ext, 0, sizeof(ext));
257 nf.nf_printed = FALSE;
261 ext.rc_feedback = nlm_feedback;
262 ext.rc_feedback_arg = &nf;
263 ext.rc_timers = NULL;
266 if (flags & F_FLOCK) {
267 ns = nlm_find_svid(id);
268 KASSERT(fl->l_start == 0 && fl->l_len == 0,
269 ("F_FLOCK lock requests must be whole-file locks"));
272 * Remember the creds used for locking in case
273 * we need to recover the lock later.
275 ns->ns_ucred = crdup(cred);
278 } else if (flags & F_REMOTE) {
280 * If we are recovering after a server restart or
281 * trashing locks on a force unmount, use the same
286 svid = ((struct proc *) id)->p_pid;
291 if ((flags & (F_FLOCK|F_WAIT)) == (F_FLOCK|F_WAIT)
292 && fl->l_type == F_WRLCK) {
294 * The semantics for flock(2) require that any
295 * shared lock on the file must be released
296 * before an exclusive lock is granted. The
297 * local locking code interprets this by
298 * unlocking the file before sleeping on a
299 * blocked exclusive lock request. We
300 * approximate this by first attempting
301 * non-blocking and if that fails, we unlock
302 * the file and block.
304 error = nlm_setlock(host, &ext, vers, &timo, retries,
305 vp, F_SETLK, fl, flags & ~F_WAIT,
306 svid, fhlen, &fh.fh_bytes, size, reclaim);
307 if (error == EAGAIN) {
308 fl->l_type = F_UNLCK;
309 error = nlm_clearlock(host, &ext, vers, &timo,
310 retries, vp, F_UNLCK, fl, flags,
311 svid, fhlen, &fh.fh_bytes, size);
312 fl->l_type = F_WRLCK;
314 mtx_lock(&nlm_svid_lock);
317 ns->ns_active = FALSE;
319 mtx_unlock(&nlm_svid_lock);
321 error = nlm_setlock(host, &ext, vers,
322 &timo, retries, vp, F_SETLK, fl,
323 flags, svid, fhlen, &fh.fh_bytes,
328 error = nlm_setlock(host, &ext, vers, &timo, retries,
329 vp, op, fl, flags, svid, fhlen, &fh.fh_bytes,
333 mtx_lock(&nlm_svid_lock);
334 if (!ns->ns_active) {
336 * Add one to the reference count to
337 * hold onto the SVID for the lifetime
338 * of the lock. Note that since
339 * F_FLOCK only supports whole-file
340 * locks, there can only be one active
341 * lock for this SVID.
344 ns->ns_active = TRUE;
346 mtx_unlock(&nlm_svid_lock);
351 error = nlm_clearlock(host, &ext, vers, &timo, retries,
352 vp, op, fl, flags, svid, fhlen, &fh.fh_bytes, size);
354 mtx_lock(&nlm_svid_lock);
357 ns->ns_active = FALSE;
359 mtx_unlock(&nlm_svid_lock);
364 error = nlm_getlock(host, &ext, vers, &timo, retries,
365 vp, op, fl, flags, svid, fhlen, &fh.fh_bytes, size);
379 nlm_host_release(host);
385 nlm_advlock(struct vop_advlock_args *ap)
388 return (nlm_advlock_internal(ap->a_vp, ap->a_id, ap->a_op, ap->a_fl,
389 ap->a_flags, FALSE, TRUE));
393 * Set the creds of td to the creds of the given lock's owner. The new
394 * creds reference count will be incremented via crhold. The caller is
395 * responsible for calling crfree and restoring td's original creds.
398 nlm_set_creds_for_lock(struct thread *td, struct flock *fl)
401 struct nlm_file_svid *ns;
406 if (fl->l_pid > PID_MAX) {
408 * If this was originally a F_FLOCK-style lock, we
409 * recorded the creds used when it was originally
410 * locked in the nlm_file_svid structure.
412 mtx_lock(&nlm_svid_lock);
413 for (i = 0; i < NLM_SVID_HASH_SIZE; i++) {
414 for (ns = LIST_FIRST(&nlm_file_svids[i]); ns;
415 ns = LIST_NEXT(ns, ns_link)) {
416 if (ns->ns_svid == fl->l_pid) {
417 cred = crhold(ns->ns_ucred);
422 mtx_unlock(&nlm_svid_lock);
425 * This lock is owned by a process. Get a reference to
428 p = pfind(fl->l_pid);
430 cred = crhold(p->p_ucred);
436 * If we can't find a cred, fall back on the recovery
440 cred = crhold(td->td_ucred);
447 nlm_reclaim_free_lock(struct vnode *vp, struct flock *fl, void *arg)
450 struct thread *td = curthread;
451 struct ucred *oldcred;
455 newfl.l_type = F_UNLCK;
457 oldcred = td->td_ucred;
458 nlm_set_creds_for_lock(td, &newfl);
460 error = nlm_advlock_internal(vp, NULL, F_UNLCK, &newfl, F_REMOTE,
463 crfree(td->td_ucred);
464 td->td_ucred = oldcred;
470 nlm_reclaim(struct vop_reclaim_args *ap)
473 nlm_cancel_wait(ap->a_vp);
474 lf_iteratelocks_vnode(ap->a_vp, nlm_reclaim_free_lock, NULL);
478 struct nlm_recovery_context {
479 struct nlm_host *nr_host; /* host we are recovering */
480 int nr_state; /* remote NSM state for recovery */
484 nlm_client_recover_lock(struct vnode *vp, struct flock *fl, void *arg)
486 struct nlm_recovery_context *nr = (struct nlm_recovery_context *) arg;
487 struct thread *td = curthread;
488 struct ucred *oldcred;
492 * If the remote NSM state changes during recovery, the host
493 * must have rebooted a second time. In that case, we must
494 * restart the recovery.
496 state = nlm_host_get_state(nr->nr_host);
497 if (nr->nr_state != state)
500 error = vn_lock(vp, LK_SHARED);
504 oldcred = td->td_ucred;
505 nlm_set_creds_for_lock(td, fl);
507 error = nlm_advlock_internal(vp, NULL, F_SETLK, fl, F_REMOTE,
510 crfree(td->td_ucred);
511 td->td_ucred = oldcred;
517 nlm_client_recovery(struct nlm_host *host)
519 struct nlm_recovery_context nr;
522 sysid = NLM_SYSID_CLIENT | nlm_host_get_sysid(host);
525 nr.nr_state = nlm_host_get_state(host);
526 error = lf_iteratelocks_sysid(sysid,
527 nlm_client_recover_lock, &nr);
528 } while (error == ERESTART);
532 nlm_convert_to_nlm_lock(struct nlm_lock *dst, struct nlm4_lock *src)
535 dst->caller_name = src->caller_name;
538 dst->svid = src->svid;
539 dst->l_offset = src->l_offset;
540 dst->l_len = src->l_len;
544 nlm_convert_to_nlm4_holder(struct nlm4_holder *dst, struct nlm_holder *src)
547 dst->exclusive = src->exclusive;
548 dst->svid = src->svid;
550 dst->l_offset = src->l_offset;
551 dst->l_len = src->l_len;
555 nlm_convert_to_nlm4_res(struct nlm4_res *dst, struct nlm_res *src)
557 dst->cookie = src->cookie;
558 dst->stat.stat = (enum nlm4_stats) src->stat.stat;
561 static enum clnt_stat
562 nlm_test_rpc(rpcvers_t vers, nlm4_testargs *args, nlm4_testres *res, CLIENT *client,
563 struct rpc_callextra *ext, struct timeval timo)
565 if (vers == NLM_VERS4) {
566 return nlm4_test_4(args, res, client, ext, timo);
572 args1.cookie = args->cookie;
573 args1.exclusive = args->exclusive;
574 nlm_convert_to_nlm_lock(&args1.alock, &args->alock);
575 memset(&res1, 0, sizeof(res1));
577 stat = nlm_test_1(&args1, &res1, client, ext, timo);
579 if (stat == RPC_SUCCESS) {
580 res->cookie = res1.cookie;
581 res->stat.stat = (enum nlm4_stats) res1.stat.stat;
582 if (res1.stat.stat == nlm_denied)
583 nlm_convert_to_nlm4_holder(
584 &res->stat.nlm4_testrply_u.holder,
585 &res1.stat.nlm_testrply_u.holder);
592 static enum clnt_stat
593 nlm_lock_rpc(rpcvers_t vers, nlm4_lockargs *args, nlm4_res *res, CLIENT *client,
594 struct rpc_callextra *ext, struct timeval timo)
596 if (vers == NLM_VERS4) {
597 return nlm4_lock_4(args, res, client, ext, timo);
603 args1.cookie = args->cookie;
604 args1.block = args->block;
605 args1.exclusive = args->exclusive;
606 nlm_convert_to_nlm_lock(&args1.alock, &args->alock);
607 args1.reclaim = args->reclaim;
608 args1.state = args->state;
609 memset(&res1, 0, sizeof(res1));
611 stat = nlm_lock_1(&args1, &res1, client, ext, timo);
613 if (stat == RPC_SUCCESS) {
614 nlm_convert_to_nlm4_res(res, &res1);
621 static enum clnt_stat
622 nlm_cancel_rpc(rpcvers_t vers, nlm4_cancargs *args, nlm4_res *res, CLIENT *client,
623 struct rpc_callextra *ext, struct timeval timo)
625 if (vers == NLM_VERS4) {
626 return nlm4_cancel_4(args, res, client, ext, timo);
632 args1.cookie = args->cookie;
633 args1.block = args->block;
634 args1.exclusive = args->exclusive;
635 nlm_convert_to_nlm_lock(&args1.alock, &args->alock);
636 memset(&res1, 0, sizeof(res1));
638 stat = nlm_cancel_1(&args1, &res1, client, ext, timo);
640 if (stat == RPC_SUCCESS) {
641 nlm_convert_to_nlm4_res(res, &res1);
648 static enum clnt_stat
649 nlm_unlock_rpc(rpcvers_t vers, nlm4_unlockargs *args, nlm4_res *res, CLIENT *client,
650 struct rpc_callextra *ext, struct timeval timo)
652 if (vers == NLM_VERS4) {
653 return nlm4_unlock_4(args, res, client, ext, timo);
655 nlm_unlockargs args1;
659 args1.cookie = args->cookie;
660 nlm_convert_to_nlm_lock(&args1.alock, &args->alock);
661 memset(&res1, 0, sizeof(res1));
663 stat = nlm_unlock_1(&args1, &res1, client, ext, timo);
665 if (stat == RPC_SUCCESS) {
666 nlm_convert_to_nlm4_res(res, &res1);
674 * Called after a lock request (set or clear) succeeded. We record the
675 * details in the local lock manager. Note that since the remote
676 * server has granted the lock, we can be sure that it doesn't
677 * conflict with any other locks we have in the local lock manager.
679 * Since it is possible that host may also make NLM client requests to
680 * our NLM server, we use a different sysid value to record our own
683 * Note that since it is possible for us to receive replies from the
684 * server in a different order than the locks were granted (e.g. if
685 * many local threads are contending for the same lock), we must use a
686 * blocking operation when registering with the local lock manager.
687 * We expect that any actual wait will be rare and short hence we
688 * ignore signals for this.
691 nlm_record_lock(struct vnode *vp, int op, struct flock *fl,
692 int svid, int sysid, off_t size)
694 struct vop_advlockasync_args a;
702 a.a_flags = F_REMOTE|F_WAIT|F_NOINTR;
705 newfl.l_start = fl->l_start;
706 newfl.l_len = fl->l_len;
707 newfl.l_type = fl->l_type;
708 newfl.l_whence = fl->l_whence;
710 newfl.l_sysid = NLM_SYSID_CLIENT | sysid;
712 error = lf_advlockasync(&a, &vp->v_lockf, size);
713 KASSERT(error == 0 || error == ENOENT,
714 ("Failed to register NFS lock locally - error=%d", error));
718 nlm_setlock(struct nlm_host *host, struct rpc_callextra *ext,
719 rpcvers_t vers, struct timeval *timo, int retries,
720 struct vnode *vp, int op, struct flock *fl, int flags,
721 int svid, size_t fhlen, void *fh, off_t size, bool_t reclaim)
723 struct nlm4_lockargs args;
729 int retry, block, exclusive;
730 void *wait_handle = NULL;
733 memset(&args, 0, sizeof(args));
734 memset(&res, 0, sizeof(res));
736 block = (flags & F_WAIT) ? TRUE : FALSE;
737 exclusive = (fl->l_type == F_WRLCK);
739 error = nlm_init_lock(fl, flags, svid, vers, fhlen, fh, size,
740 &args.alock, oh_space);
744 args.exclusive = exclusive;
745 args.reclaim = reclaim;
746 args.state = nlm_nsm_state;
750 client = nlm_host_get_rpc(host, FALSE);
752 return (ENOLCK); /* XXX retry? */
755 wait_handle = nlm_register_wait_lock(&args.alock, vp);
757 xid = atomic_fetchadd_int(&nlm_xid, 1);
758 args.cookie.n_len = sizeof(xid);
759 args.cookie.n_bytes = (char*) &xid;
761 stat = nlm_lock_rpc(vers, &args, &res, client, ext, *timo);
763 CLNT_RELEASE(client);
765 if (stat != RPC_SUCCESS) {
767 nlm_deregister_wait_lock(wait_handle);
778 xdr_free((xdrproc_t) xdr_nlm4_res, &res);
780 if (block && res.stat.stat != nlm4_blocked)
781 nlm_deregister_wait_lock(wait_handle);
783 if (res.stat.stat == nlm4_denied_grace_period) {
785 * The server has recently rebooted and is
786 * giving old clients a change to reclaim
787 * their locks. Wait for a few seconds and try
790 error = tsleep(&args, PCATCH, "nlmgrace", retry);
791 if (error && error != EWOULDBLOCK)
799 if (block && res.stat.stat == nlm4_blocked) {
801 * The server should call us back with a
802 * granted message when the lock succeeds. In
803 * order to deal with broken servers, lost
804 * granted messages and server reboots, we
805 * will also re-try every few seconds.
807 error = nlm_wait_lock(wait_handle, retry);
808 if (error == EWOULDBLOCK) {
816 * We need to call the server to
817 * cancel our lock request.
819 nlm4_cancargs cancel;
821 memset(&cancel, 0, sizeof(cancel));
823 xid = atomic_fetchadd_int(&nlm_xid, 1);
824 cancel.cookie.n_len = sizeof(xid);
825 cancel.cookie.n_bytes = (char*) &xid;
826 cancel.block = block;
827 cancel.exclusive = exclusive;
828 cancel.alock = args.alock;
831 client = nlm_host_get_rpc(host, FALSE);
836 stat = nlm_cancel_rpc(vers, &cancel,
837 &res, client, ext, *timo);
839 CLNT_RELEASE(client);
841 if (stat != RPC_SUCCESS) {
847 * reboots. This means
853 pause("nlmcancel", 10*hz);
855 } while (stat != RPC_SUCCESS);
860 xdr_free((xdrproc_t) xdr_nlm4_res, &res);
862 switch (res.stat.stat) {
874 case nlm4_denied_grace_period:
877 * recently rebooted -
903 error = nlm_map_status(res.stat.stat);
906 if (!error && !reclaim) {
907 nlm_record_lock(vp, op, fl, args.alock.svid,
908 nlm_host_get_sysid(host), size);
909 nlm_host_monitor(host, 0);
917 nlm_clearlock(struct nlm_host *host, struct rpc_callextra *ext,
918 rpcvers_t vers, struct timeval *timo, int retries,
919 struct vnode *vp, int op, struct flock *fl, int flags,
920 int svid, size_t fhlen, void *fh, off_t size)
922 struct nlm4_unlockargs args;
930 memset(&args, 0, sizeof(args));
931 memset(&res, 0, sizeof(res));
933 error = nlm_init_lock(fl, flags, svid, vers, fhlen, fh, size,
934 &args.alock, oh_space);
939 client = nlm_host_get_rpc(host, FALSE);
941 return (ENOLCK); /* XXX retry? */
943 xid = atomic_fetchadd_int(&nlm_xid, 1);
944 args.cookie.n_len = sizeof(xid);
945 args.cookie.n_bytes = (char*) &xid;
947 stat = nlm_unlock_rpc(vers, &args, &res, client, ext, *timo);
949 CLNT_RELEASE(client);
951 if (stat != RPC_SUCCESS) {
962 xdr_free((xdrproc_t) xdr_nlm4_res, &res);
964 if (res.stat.stat == nlm4_denied_grace_period) {
966 * The server has recently rebooted and is
967 * giving old clients a change to reclaim
968 * their locks. Wait for a few seconds and try
971 error = tsleep(&args, PCATCH, "nlmgrace", 5*hz);
972 if (error && error != EWOULDBLOCK)
978 * If we are being called via nlm_reclaim (which will
979 * use the F_REMOTE flag), don't record the lock
980 * operation in the local lock manager since the vnode
983 if (!(flags & F_REMOTE))
984 nlm_record_lock(vp, op, fl, args.alock.svid,
985 nlm_host_get_sysid(host), size);
992 nlm_getlock(struct nlm_host *host, struct rpc_callextra *ext,
993 rpcvers_t vers, struct timeval *timo, int retries,
994 struct vnode *vp, int op, struct flock *fl, int flags,
995 int svid, size_t fhlen, void *fh, off_t size)
997 struct nlm4_testargs args;
999 struct nlm4_testres res;
1002 enum clnt_stat stat;
1006 KASSERT(!(flags & F_FLOCK), ("unexpected F_FLOCK for F_GETLK"));
1008 memset(&args, 0, sizeof(args));
1009 memset(&res, 0, sizeof(res));
1011 exclusive = (fl->l_type == F_WRLCK);
1013 error = nlm_init_lock(fl, flags, svid, vers, fhlen, fh, size,
1014 &args.alock, oh_space);
1017 args.exclusive = exclusive;
1020 client = nlm_host_get_rpc(host, FALSE);
1022 return (ENOLCK); /* XXX retry? */
1024 xid = atomic_fetchadd_int(&nlm_xid, 1);
1025 args.cookie.n_len = sizeof(xid);
1026 args.cookie.n_bytes = (char*) &xid;
1028 stat = nlm_test_rpc(vers, &args, &res, client, ext, *timo);
1030 CLNT_RELEASE(client);
1032 if (stat != RPC_SUCCESS) {
1040 if (res.stat.stat == nlm4_denied_grace_period) {
1042 * The server has recently rebooted and is
1043 * giving old clients a change to reclaim
1044 * their locks. Wait for a few seconds and try
1047 xdr_free((xdrproc_t) xdr_nlm4_testres, &res);
1048 error = tsleep(&args, PCATCH, "nlmgrace", 5*hz);
1049 if (error && error != EWOULDBLOCK)
1054 if (res.stat.stat == nlm4_denied) {
1055 struct nlm4_holder *h =
1056 &res.stat.nlm4_testrply_u.holder;
1057 fl->l_start = h->l_offset;
1058 fl->l_len = h->l_len;
1059 fl->l_pid = h->svid;
1061 fl->l_type = F_WRLCK;
1063 fl->l_type = F_RDLCK;
1064 fl->l_whence = SEEK_SET;
1067 fl->l_type = F_UNLCK;
1070 xdr_free((xdrproc_t) xdr_nlm4_testres, &res);
1077 nlm_map_status(nlm4_stats stat)
1086 case nlm4_denied_nolocks:
1109 static struct nlm_file_svid *
1110 nlm_find_svid(void *id)
1112 struct nlm_file_svid *ns, *newns;
1115 h = (((uintptr_t) id) >> 7) % NLM_SVID_HASH_SIZE;
1117 mtx_lock(&nlm_svid_lock);
1118 LIST_FOREACH(ns, &nlm_file_svids[h], ns_link) {
1119 if (ns->ns_id == id) {
1124 mtx_unlock(&nlm_svid_lock);
1126 int svid = alloc_unr(nlm_svid_allocator);
1127 newns = malloc(sizeof(struct nlm_file_svid), M_NLM,
1131 newns->ns_svid = svid;
1132 newns->ns_ucred = NULL;
1133 newns->ns_active = FALSE;
1136 * We need to check for a race with some other
1137 * thread allocating a svid for this file.
1139 mtx_lock(&nlm_svid_lock);
1140 LIST_FOREACH(ns, &nlm_file_svids[h], ns_link) {
1141 if (ns->ns_id == id) {
1147 mtx_unlock(&nlm_svid_lock);
1148 free_unr(nlm_svid_allocator, newns->ns_svid);
1151 LIST_INSERT_HEAD(&nlm_file_svids[h], newns,
1154 mtx_unlock(&nlm_svid_lock);
1162 nlm_free_svid(struct nlm_file_svid *ns)
1165 mtx_lock(&nlm_svid_lock);
1168 KASSERT(!ns->ns_active, ("Freeing active SVID"));
1169 LIST_REMOVE(ns, ns_link);
1170 mtx_unlock(&nlm_svid_lock);
1171 free_unr(nlm_svid_allocator, ns->ns_svid);
1173 crfree(ns->ns_ucred);
1176 mtx_unlock(&nlm_svid_lock);
1181 nlm_init_lock(struct flock *fl, int flags, int svid,
1182 rpcvers_t vers, size_t fhlen, void *fh, off_t size,
1183 struct nlm4_lock *lock, char oh_space[32])
1188 if (fl->l_whence == SEEK_END) {
1190 || (fl->l_start > 0 && size > OFF_MAX - fl->l_start))
1192 start = size + fl->l_start;
1193 } else if (fl->l_whence == SEEK_SET || fl->l_whence == SEEK_CUR) {
1194 start = fl->l_start;
1200 if (fl->l_len < 0) {
1209 if (vers == NLM_VERS) {
1211 * Enforce range limits on V1 locks
1213 if (start > 0xffffffffLL || len > 0xffffffffLL)
1217 snprintf(oh_space, 32, "%d@", svid);
1218 oh_len = strlen(oh_space);
1219 getcredhostname(NULL, oh_space + oh_len, 32 - oh_len);
1220 oh_len = strlen(oh_space);
1222 memset(lock, 0, sizeof(*lock));
1223 lock->caller_name = prison0.pr_hostname;
1224 lock->fh.n_len = fhlen;
1225 lock->fh.n_bytes = fh;
1226 lock->oh.n_len = oh_len;
1227 lock->oh.n_bytes = oh_space;
1229 lock->l_offset = start;