xref: /freebsd/sys/fs/nfsclient/nfs_clstate.c (revision 7c1b51d6dc2e165ae7333373513b080f17cf79bd)
1 /*-
2  * Copyright (c) 2009 Rick Macklem, University of Guelph
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  */
27 
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30 
31 /*
32  * These functions implement the client side state handling for NFSv4.
33  * NFSv4 state handling:
34  * - A lockowner is used to determine lock contention, so it
35  *   corresponds directly to a Posix pid. (1 to 1 mapping)
36  * - The correct granularity of an OpenOwner is not nearly so
37  *   obvious. An OpenOwner does the following:
38  *   - provides a serial sequencing of Open/Close/Lock-with-new-lockowner
39  *   - is used to check for Open/Share contention (not applicable to
40  *     this client, since all Opens are Deny_None)
41  *   As such, I considered both extreme.
42  *   1 OpenOwner per ClientID - Simple to manage, but fully serializes
43  *   all Open, Close and Lock (with a new lockowner) Ops.
44  *   1 OpenOwner for each Open - This one results in an OpenConfirm for
45  *   every Open, for most servers.
46  *   So, I chose to use the same mapping as I did for LockOwnwers.
47  *   The main concern here is that you can end up with multiple Opens
48  *   for the same File Handle, but on different OpenOwners (opens
49  *   inherited from parents, grandparents...) and you do not know
50  *   which of these the vnodeop close applies to. This is handled by
51  *   delaying the Close Op(s) until all of the Opens have been closed.
52  *   (It is not yet obvious if this is the correct granularity.)
53  * - How the code handles serialization:
54  *   - For the ClientId, it uses an exclusive lock while getting its
55  *     SetClientId and during recovery. Otherwise, it uses a shared
56  *     lock via a reference count.
57  *   - For the rest of the data structures, it uses an SMP mutex
58  *     (once the nfs client is SMP safe) and doesn't sleep while
59  *     manipulating the linked lists.
60  *   - The serialization of Open/Close/Lock/LockU falls out in the
61  *     "wash", since OpenOwners and LockOwners are both mapped from
62  *     Posix pid. In other words, there is only one Posix pid using
63  *     any given owner, so that owner is serialized. (If you change
64  *     the granularity of the OpenOwner, then code must be added to
65  *     serialize Ops on the OpenOwner.)
66  * - When to get rid of OpenOwners and LockOwners.
67  *   - The function nfscl_cleanup_common() is executed after a process exits.
68  *     It goes through the client list looking for all Open and Lock Owners.
69  *     When one is found, it is marked "defunct" or in the case of
70  *     an OpenOwner without any Opens, freed.
71  *     The renew thread scans for defunct Owners and gets rid of them,
72  *     if it can. The LockOwners will also be deleted when the
73  *     associated Open is closed.
74  *   - If the LockU or Close Op(s) fail during close in a way
75  *     that could be recovered upon retry, they are relinked to the
76  *     ClientId's defunct open list and retried by the renew thread
77  *     until they succeed or an unmount/recovery occurs.
78  *     (Since we are done with them, they do not need to be recovered.)
79  */
80 
81 #ifndef APPLEKEXT
82 #include <fs/nfs/nfsport.h>
83 
84 /*
85  * Global variables
86  */
87 extern struct nfsstatsv1 nfsstatsv1;
88 extern struct nfsreqhead nfsd_reqq;
89 extern u_int32_t newnfs_false, newnfs_true;
90 extern int nfscl_debuglevel;
91 extern int nfscl_enablecallb;
92 extern int nfs_numnfscbd;
93 NFSREQSPINLOCK;
94 NFSCLSTATEMUTEX;
95 int nfscl_inited = 0;
96 struct nfsclhead nfsclhead;	/* Head of clientid list */
97 int nfscl_deleghighwater = NFSCLDELEGHIGHWATER;
98 int nfscl_layouthighwater = NFSCLLAYOUTHIGHWATER;
99 #endif	/* !APPLEKEXT */
100 
101 static int nfscl_delegcnt = 0;
102 static int nfscl_layoutcnt = 0;
103 static int nfscl_getopen(struct nfsclownerhead *, u_int8_t *, int, u_int8_t *,
104     u_int8_t *, u_int32_t, struct nfscllockowner **, struct nfsclopen **);
105 static void nfscl_clrelease(struct nfsclclient *);
106 static void nfscl_cleanclient(struct nfsclclient *);
107 static void nfscl_expireclient(struct nfsclclient *, struct nfsmount *,
108     struct ucred *, NFSPROC_T *);
109 static int nfscl_expireopen(struct nfsclclient *, struct nfsclopen *,
110     struct nfsmount *, struct ucred *, NFSPROC_T *);
111 static void nfscl_recover(struct nfsclclient *, struct ucred *, NFSPROC_T *);
112 static void nfscl_insertlock(struct nfscllockowner *, struct nfscllock *,
113     struct nfscllock *, int);
114 static int nfscl_updatelock(struct nfscllockowner *, struct nfscllock **,
115     struct nfscllock **, int);
116 static void nfscl_delegreturnall(struct nfsclclient *, NFSPROC_T *);
117 static u_int32_t nfscl_nextcbident(void);
118 static mount_t nfscl_getmnt(int, uint8_t *, u_int32_t, struct nfsclclient **);
119 static struct nfsclclient *nfscl_getclnt(u_int32_t);
120 static struct nfsclclient *nfscl_getclntsess(uint8_t *);
121 static struct nfscldeleg *nfscl_finddeleg(struct nfsclclient *, u_int8_t *,
122     int);
123 static void nfscl_retoncloselayout(vnode_t, struct nfsclclient *, uint8_t *,
124     int, struct nfsclrecalllayout **);
125 static void nfscl_reldevinfo_locked(struct nfscldevinfo *);
126 static struct nfscllayout *nfscl_findlayout(struct nfsclclient *, u_int8_t *,
127     int);
128 static struct nfscldevinfo *nfscl_finddevinfo(struct nfsclclient *, uint8_t *);
129 static int nfscl_checkconflict(struct nfscllockownerhead *, struct nfscllock *,
130     u_int8_t *, struct nfscllock **);
131 static void nfscl_freealllocks(struct nfscllockownerhead *, int);
132 static int nfscl_localconflict(struct nfsclclient *, u_int8_t *, int,
133     struct nfscllock *, u_int8_t *, struct nfscldeleg *, struct nfscllock **);
134 static void nfscl_newopen(struct nfsclclient *, struct nfscldeleg *,
135     struct nfsclowner **, struct nfsclowner **, struct nfsclopen **,
136     struct nfsclopen **, u_int8_t *, u_int8_t *, int, struct ucred *, int *);
137 static int nfscl_moveopen(vnode_t , struct nfsclclient *,
138     struct nfsmount *, struct nfsclopen *, struct nfsclowner *,
139     struct nfscldeleg *, struct ucred *, NFSPROC_T *);
140 static void nfscl_totalrecall(struct nfsclclient *);
141 static int nfscl_relock(vnode_t , struct nfsclclient *, struct nfsmount *,
142     struct nfscllockowner *, struct nfscllock *, struct ucred *, NFSPROC_T *);
143 static int nfscl_tryopen(struct nfsmount *, vnode_t , u_int8_t *, int,
144     u_int8_t *, int, u_int32_t, struct nfsclopen *, u_int8_t *, int,
145     struct nfscldeleg **, int, u_int32_t, struct ucred *, NFSPROC_T *);
146 static int nfscl_trylock(struct nfsmount *, vnode_t , u_int8_t *,
147     int, struct nfscllockowner *, int, int, u_int64_t, u_int64_t, short,
148     struct ucred *, NFSPROC_T *);
149 static int nfsrpc_reopen(struct nfsmount *, u_int8_t *, int, u_int32_t,
150     struct nfsclopen *, struct nfscldeleg **, struct ucred *, NFSPROC_T *);
151 static void nfscl_freedeleg(struct nfscldeleghead *, struct nfscldeleg *);
152 static int nfscl_errmap(struct nfsrv_descript *, u_int32_t);
153 static void nfscl_cleanup_common(struct nfsclclient *, u_int8_t *);
154 static int nfscl_recalldeleg(struct nfsclclient *, struct nfsmount *,
155     struct nfscldeleg *, vnode_t, struct ucred *, NFSPROC_T *, int);
156 static void nfscl_freeopenowner(struct nfsclowner *, int);
157 static void nfscl_cleandeleg(struct nfscldeleg *);
158 static int nfscl_trydelegreturn(struct nfscldeleg *, struct ucred *,
159     struct nfsmount *, NFSPROC_T *);
160 static void nfscl_emptylockowner(struct nfscllockowner *,
161     struct nfscllockownerfhhead *);
162 static void nfscl_mergeflayouts(struct nfsclflayouthead *,
163     struct nfsclflayouthead *);
164 static int nfscl_layoutrecall(int, struct nfscllayout *, uint32_t, uint64_t,
165     uint64_t, uint32_t, struct nfsclrecalllayout *);
166 static int nfscl_seq(uint32_t, uint32_t);
167 static void nfscl_layoutreturn(struct nfsmount *, struct nfscllayout *,
168     struct ucred *, NFSPROC_T *);
169 static void nfscl_dolayoutcommit(struct nfsmount *, struct nfscllayout *,
170     struct ucred *, NFSPROC_T *);
171 
172 static short nfscberr_null[] = {
173 	0,
174 	0,
175 };
176 
177 static short nfscberr_getattr[] = {
178 	NFSERR_RESOURCE,
179 	NFSERR_BADHANDLE,
180 	NFSERR_BADXDR,
181 	NFSERR_RESOURCE,
182 	NFSERR_SERVERFAULT,
183 	0,
184 };
185 
186 static short nfscberr_recall[] = {
187 	NFSERR_RESOURCE,
188 	NFSERR_BADHANDLE,
189 	NFSERR_BADSTATEID,
190 	NFSERR_BADXDR,
191 	NFSERR_RESOURCE,
192 	NFSERR_SERVERFAULT,
193 	0,
194 };
195 
196 static short *nfscl_cberrmap[] = {
197 	nfscberr_null,
198 	nfscberr_null,
199 	nfscberr_null,
200 	nfscberr_getattr,
201 	nfscberr_recall
202 };
203 
204 #define	NETFAMILY(clp) \
205 		(((clp)->nfsc_flags & NFSCLFLAGS_AFINET6) ? AF_INET6 : AF_INET)
206 
207 /*
208  * Called for an open operation.
209  * If the nfhp argument is NULL, just get an openowner.
210  */
211 APPLESTATIC int
212 nfscl_open(vnode_t vp, u_int8_t *nfhp, int fhlen, u_int32_t amode, int usedeleg,
213     struct ucred *cred, NFSPROC_T *p, struct nfsclowner **owpp,
214     struct nfsclopen **opp, int *newonep, int *retp, int lockit)
215 {
216 	struct nfsclclient *clp;
217 	struct nfsclowner *owp, *nowp;
218 	struct nfsclopen *op = NULL, *nop = NULL;
219 	struct nfscldeleg *dp;
220 	struct nfsclownerhead *ohp;
221 	u_int8_t own[NFSV4CL_LOCKNAMELEN];
222 	int ret;
223 
224 	if (newonep != NULL)
225 		*newonep = 0;
226 	if (opp != NULL)
227 		*opp = NULL;
228 	if (owpp != NULL)
229 		*owpp = NULL;
230 
231 	/*
232 	 * Might need one or both of these, so MALLOC them now, to
233 	 * avoid a tsleep() in MALLOC later.
234 	 */
235 	MALLOC(nowp, struct nfsclowner *, sizeof (struct nfsclowner),
236 	    M_NFSCLOWNER, M_WAITOK);
237 	if (nfhp != NULL)
238 	    MALLOC(nop, struct nfsclopen *, sizeof (struct nfsclopen) +
239 		fhlen - 1, M_NFSCLOPEN, M_WAITOK);
240 	ret = nfscl_getcl(vnode_mount(vp), cred, p, 1, &clp);
241 	if (ret != 0) {
242 		FREE((caddr_t)nowp, M_NFSCLOWNER);
243 		if (nop != NULL)
244 			FREE((caddr_t)nop, M_NFSCLOPEN);
245 		return (ret);
246 	}
247 
248 	/*
249 	 * Get the Open iff it already exists.
250 	 * If none found, add the new one or return error, depending upon
251 	 * "create".
252 	 */
253 	NFSLOCKCLSTATE();
254 	dp = NULL;
255 	/* First check the delegation list */
256 	if (nfhp != NULL && usedeleg) {
257 		LIST_FOREACH(dp, NFSCLDELEGHASH(clp, nfhp, fhlen), nfsdl_hash) {
258 			if (dp->nfsdl_fhlen == fhlen &&
259 			    !NFSBCMP(nfhp, dp->nfsdl_fh, fhlen)) {
260 				if (!(amode & NFSV4OPEN_ACCESSWRITE) ||
261 				    (dp->nfsdl_flags & NFSCLDL_WRITE))
262 					break;
263 				dp = NULL;
264 				break;
265 			}
266 		}
267 	}
268 
269 	if (dp != NULL) {
270 		nfscl_filllockowner(p->td_proc, own, F_POSIX);
271 		ohp = &dp->nfsdl_owner;
272 	} else {
273 		/* For NFSv4.1 and this option, use a single open_owner. */
274 		if (NFSHASONEOPENOWN(VFSTONFS(vnode_mount(vp))))
275 			nfscl_filllockowner(NULL, own, F_POSIX);
276 		else
277 			nfscl_filllockowner(p->td_proc, own, F_POSIX);
278 		ohp = &clp->nfsc_owner;
279 	}
280 	/* Now, search for an openowner */
281 	LIST_FOREACH(owp, ohp, nfsow_list) {
282 		if (!NFSBCMP(owp->nfsow_owner, own, NFSV4CL_LOCKNAMELEN))
283 			break;
284 	}
285 
286 	/*
287 	 * Create a new open, as required.
288 	 */
289 	nfscl_newopen(clp, dp, &owp, &nowp, &op, &nop, own, nfhp, fhlen,
290 	    cred, newonep);
291 
292 	/*
293 	 * Now, check the mode on the open and return the appropriate
294 	 * value.
295 	 */
296 	if (retp != NULL) {
297 		if (nfhp != NULL && dp != NULL && nop == NULL)
298 			/* new local open on delegation */
299 			*retp = NFSCLOPEN_SETCRED;
300 		else
301 			*retp = NFSCLOPEN_OK;
302 	}
303 	if (op != NULL && (amode & ~(op->nfso_mode))) {
304 		op->nfso_mode |= amode;
305 		if (retp != NULL && dp == NULL)
306 			*retp = NFSCLOPEN_DOOPEN;
307 	}
308 
309 	/*
310 	 * Serialize modifications to the open owner for multiple threads
311 	 * within the same process using a read/write sleep lock.
312 	 * For NFSv4.1 and a single OpenOwner, allow concurrent open operations
313 	 * by acquiring a shared lock.  The close operations still use an
314 	 * exclusive lock for this case.
315 	 */
316 	if (lockit != 0) {
317 		if (NFSHASONEOPENOWN(VFSTONFS(vnode_mount(vp)))) {
318 			/*
319 			 * Get a shared lock on the OpenOwner, but first
320 			 * wait for any pending exclusive lock, so that the
321 			 * exclusive locker gets priority.
322 			 */
323 			nfsv4_lock(&owp->nfsow_rwlock, 0, NULL,
324 			    NFSCLSTATEMUTEXPTR, NULL);
325 			nfsv4_getref(&owp->nfsow_rwlock, NULL,
326 			    NFSCLSTATEMUTEXPTR, NULL);
327 		} else
328 			nfscl_lockexcl(&owp->nfsow_rwlock, NFSCLSTATEMUTEXPTR);
329 	}
330 	NFSUNLOCKCLSTATE();
331 	if (nowp != NULL)
332 		FREE((caddr_t)nowp, M_NFSCLOWNER);
333 	if (nop != NULL)
334 		FREE((caddr_t)nop, M_NFSCLOPEN);
335 	if (owpp != NULL)
336 		*owpp = owp;
337 	if (opp != NULL)
338 		*opp = op;
339 	return (0);
340 }
341 
342 /*
343  * Create a new open, as required.
344  */
345 static void
346 nfscl_newopen(struct nfsclclient *clp, struct nfscldeleg *dp,
347     struct nfsclowner **owpp, struct nfsclowner **nowpp, struct nfsclopen **opp,
348     struct nfsclopen **nopp, u_int8_t *own, u_int8_t *fhp, int fhlen,
349     struct ucred *cred, int *newonep)
350 {
351 	struct nfsclowner *owp = *owpp, *nowp;
352 	struct nfsclopen *op, *nop;
353 
354 	if (nowpp != NULL)
355 		nowp = *nowpp;
356 	else
357 		nowp = NULL;
358 	if (nopp != NULL)
359 		nop = *nopp;
360 	else
361 		nop = NULL;
362 	if (owp == NULL && nowp != NULL) {
363 		NFSBCOPY(own, nowp->nfsow_owner, NFSV4CL_LOCKNAMELEN);
364 		LIST_INIT(&nowp->nfsow_open);
365 		nowp->nfsow_clp = clp;
366 		nowp->nfsow_seqid = 0;
367 		nowp->nfsow_defunct = 0;
368 		nfscl_lockinit(&nowp->nfsow_rwlock);
369 		if (dp != NULL) {
370 			nfsstatsv1.cllocalopenowners++;
371 			LIST_INSERT_HEAD(&dp->nfsdl_owner, nowp, nfsow_list);
372 		} else {
373 			nfsstatsv1.clopenowners++;
374 			LIST_INSERT_HEAD(&clp->nfsc_owner, nowp, nfsow_list);
375 		}
376 		owp = *owpp = nowp;
377 		*nowpp = NULL;
378 		if (newonep != NULL)
379 			*newonep = 1;
380 	}
381 
382 	 /* If an fhp has been specified, create an Open as well. */
383 	if (fhp != NULL) {
384 		/* and look for the correct open, based upon FH */
385 		LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
386 			if (op->nfso_fhlen == fhlen &&
387 			    !NFSBCMP(op->nfso_fh, fhp, fhlen))
388 				break;
389 		}
390 		if (op == NULL && nop != NULL) {
391 			nop->nfso_own = owp;
392 			nop->nfso_mode = 0;
393 			nop->nfso_opencnt = 0;
394 			nop->nfso_posixlock = 1;
395 			nop->nfso_fhlen = fhlen;
396 			NFSBCOPY(fhp, nop->nfso_fh, fhlen);
397 			LIST_INIT(&nop->nfso_lock);
398 			nop->nfso_stateid.seqid = 0;
399 			nop->nfso_stateid.other[0] = 0;
400 			nop->nfso_stateid.other[1] = 0;
401 			nop->nfso_stateid.other[2] = 0;
402 			KASSERT(cred != NULL, ("%s: cred NULL\n", __func__));
403 			newnfs_copyincred(cred, &nop->nfso_cred);
404 			if (dp != NULL) {
405 				TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
406 				TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp,
407 				    nfsdl_list);
408 				dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
409 				nfsstatsv1.cllocalopens++;
410 			} else {
411 				nfsstatsv1.clopens++;
412 			}
413 			LIST_INSERT_HEAD(&owp->nfsow_open, nop, nfso_list);
414 			*opp = nop;
415 			*nopp = NULL;
416 			if (newonep != NULL)
417 				*newonep = 1;
418 		} else {
419 			*opp = op;
420 		}
421 	}
422 }
423 
424 /*
425  * Called to find/add a delegation to a client.
426  */
427 APPLESTATIC int
428 nfscl_deleg(mount_t mp, struct nfsclclient *clp, u_int8_t *nfhp,
429     int fhlen, struct ucred *cred, NFSPROC_T *p, struct nfscldeleg **dpp)
430 {
431 	struct nfscldeleg *dp = *dpp, *tdp;
432 
433 	/*
434 	 * First, if we have received a Read delegation for a file on a
435 	 * read/write file system, just return it, because they aren't
436 	 * useful, imho.
437 	 */
438 	if (mp != NULL && dp != NULL && !NFSMNT_RDONLY(mp) &&
439 	    (dp->nfsdl_flags & NFSCLDL_READ)) {
440 		(void) nfscl_trydelegreturn(dp, cred, VFSTONFS(mp), p);
441 		FREE((caddr_t)dp, M_NFSCLDELEG);
442 		*dpp = NULL;
443 		return (0);
444 	}
445 
446 	/* Look for the correct deleg, based upon FH */
447 	NFSLOCKCLSTATE();
448 	tdp = nfscl_finddeleg(clp, nfhp, fhlen);
449 	if (tdp == NULL) {
450 		if (dp == NULL) {
451 			NFSUNLOCKCLSTATE();
452 			return (NFSERR_BADSTATEID);
453 		}
454 		*dpp = NULL;
455 		TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp, nfsdl_list);
456 		LIST_INSERT_HEAD(NFSCLDELEGHASH(clp, nfhp, fhlen), dp,
457 		    nfsdl_hash);
458 		dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
459 		nfsstatsv1.cldelegates++;
460 		nfscl_delegcnt++;
461 	} else {
462 		/*
463 		 * Delegation already exists, what do we do if a new one??
464 		 */
465 		if (dp != NULL) {
466 			printf("Deleg already exists!\n");
467 			FREE((caddr_t)dp, M_NFSCLDELEG);
468 			*dpp = NULL;
469 		} else {
470 			*dpp = tdp;
471 		}
472 	}
473 	NFSUNLOCKCLSTATE();
474 	return (0);
475 }
476 
477 /*
478  * Find a delegation for this file handle. Return NULL upon failure.
479  */
480 static struct nfscldeleg *
481 nfscl_finddeleg(struct nfsclclient *clp, u_int8_t *fhp, int fhlen)
482 {
483 	struct nfscldeleg *dp;
484 
485 	LIST_FOREACH(dp, NFSCLDELEGHASH(clp, fhp, fhlen), nfsdl_hash) {
486 	    if (dp->nfsdl_fhlen == fhlen &&
487 		!NFSBCMP(dp->nfsdl_fh, fhp, fhlen))
488 		break;
489 	}
490 	return (dp);
491 }
492 
493 /*
494  * Get a stateid for an I/O operation. First, look for an open and iff
495  * found, return either a lockowner stateid or the open stateid.
496  * If no Open is found, just return error and the special stateid of all zeros.
497  */
498 APPLESTATIC int
499 nfscl_getstateid(vnode_t vp, u_int8_t *nfhp, int fhlen, u_int32_t mode,
500     int fords, struct ucred *cred, NFSPROC_T *p, nfsv4stateid_t *stateidp,
501     void **lckpp)
502 {
503 	struct nfsclclient *clp;
504 	struct nfsclowner *owp;
505 	struct nfsclopen *op = NULL, *top;
506 	struct nfscllockowner *lp;
507 	struct nfscldeleg *dp;
508 	struct nfsnode *np;
509 	struct nfsmount *nmp;
510 	u_int8_t own[NFSV4CL_LOCKNAMELEN];
511 	int error, done;
512 
513 	*lckpp = NULL;
514 	/*
515 	 * Initially, just set the special stateid of all zeros.
516 	 * (Don't do this for a DS, since the special stateid can't be used.)
517 	 */
518 	if (fords == 0) {
519 		stateidp->seqid = 0;
520 		stateidp->other[0] = 0;
521 		stateidp->other[1] = 0;
522 		stateidp->other[2] = 0;
523 	}
524 	if (vnode_vtype(vp) != VREG)
525 		return (EISDIR);
526 	np = VTONFS(vp);
527 	nmp = VFSTONFS(vnode_mount(vp));
528 	NFSLOCKCLSTATE();
529 	clp = nfscl_findcl(nmp);
530 	if (clp == NULL) {
531 		NFSUNLOCKCLSTATE();
532 		return (EACCES);
533 	}
534 
535 	/*
536 	 * Wait for recovery to complete.
537 	 */
538 	while ((clp->nfsc_flags & NFSCLFLAGS_RECVRINPROG))
539 		(void) nfsmsleep(&clp->nfsc_flags, NFSCLSTATEMUTEXPTR,
540 		    PZERO, "nfsrecvr", NULL);
541 
542 	/*
543 	 * First, look for a delegation.
544 	 */
545 	LIST_FOREACH(dp, NFSCLDELEGHASH(clp, nfhp, fhlen), nfsdl_hash) {
546 		if (dp->nfsdl_fhlen == fhlen &&
547 		    !NFSBCMP(nfhp, dp->nfsdl_fh, fhlen)) {
548 			if (!(mode & NFSV4OPEN_ACCESSWRITE) ||
549 			    (dp->nfsdl_flags & NFSCLDL_WRITE)) {
550 				stateidp->seqid = dp->nfsdl_stateid.seqid;
551 				stateidp->other[0] = dp->nfsdl_stateid.other[0];
552 				stateidp->other[1] = dp->nfsdl_stateid.other[1];
553 				stateidp->other[2] = dp->nfsdl_stateid.other[2];
554 				if (!(np->n_flag & NDELEGRECALL)) {
555 					TAILQ_REMOVE(&clp->nfsc_deleg, dp,
556 					    nfsdl_list);
557 					TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp,
558 					    nfsdl_list);
559 					dp->nfsdl_timestamp = NFSD_MONOSEC +
560 					    120;
561 					dp->nfsdl_rwlock.nfslock_usecnt++;
562 					*lckpp = (void *)&dp->nfsdl_rwlock;
563 				}
564 				NFSUNLOCKCLSTATE();
565 				return (0);
566 			}
567 			break;
568 		}
569 	}
570 
571 	if (p != NULL) {
572 		/*
573 		 * If p != NULL, we want to search the parentage tree
574 		 * for a matching OpenOwner and use that.
575 		 */
576 		if (NFSHASONEOPENOWN(VFSTONFS(vnode_mount(vp))))
577 			nfscl_filllockowner(NULL, own, F_POSIX);
578 		else
579 			nfscl_filllockowner(p->td_proc, own, F_POSIX);
580 		lp = NULL;
581 		error = nfscl_getopen(&clp->nfsc_owner, nfhp, fhlen, own, own,
582 		    mode, &lp, &op);
583 		if (error == 0 && lp != NULL && fords == 0) {
584 			/* Don't return a lock stateid for a DS. */
585 			stateidp->seqid =
586 			    lp->nfsl_stateid.seqid;
587 			stateidp->other[0] =
588 			    lp->nfsl_stateid.other[0];
589 			stateidp->other[1] =
590 			    lp->nfsl_stateid.other[1];
591 			stateidp->other[2] =
592 			    lp->nfsl_stateid.other[2];
593 			NFSUNLOCKCLSTATE();
594 			return (0);
595 		}
596 	}
597 	if (op == NULL) {
598 		/* If not found, just look for any OpenOwner that will work. */
599 		top = NULL;
600 		done = 0;
601 		owp = LIST_FIRST(&clp->nfsc_owner);
602 		while (!done && owp != NULL) {
603 			LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
604 				if (op->nfso_fhlen == fhlen &&
605 				    !NFSBCMP(op->nfso_fh, nfhp, fhlen)) {
606 					if (top == NULL && (op->nfso_mode &
607 					    NFSV4OPEN_ACCESSWRITE) != 0 &&
608 					    (mode & NFSV4OPEN_ACCESSREAD) != 0)
609 						top = op;
610 					if ((mode & op->nfso_mode) == mode) {
611 						done = 1;
612 						break;
613 					}
614 				}
615 			}
616 			if (!done)
617 				owp = LIST_NEXT(owp, nfsow_list);
618 		}
619 		if (!done) {
620 			NFSCL_DEBUG(2, "openmode top=%p\n", top);
621 			if (top == NULL || NFSHASOPENMODE(nmp)) {
622 				NFSUNLOCKCLSTATE();
623 				return (ENOENT);
624 			} else
625 				op = top;
626 		}
627 		/*
628 		 * For read aheads or write behinds, use the open cred.
629 		 * A read ahead or write behind is indicated by p == NULL.
630 		 */
631 		if (p == NULL)
632 			newnfs_copycred(&op->nfso_cred, cred);
633 	}
634 
635 	/*
636 	 * No lock stateid, so return the open stateid.
637 	 */
638 	stateidp->seqid = op->nfso_stateid.seqid;
639 	stateidp->other[0] = op->nfso_stateid.other[0];
640 	stateidp->other[1] = op->nfso_stateid.other[1];
641 	stateidp->other[2] = op->nfso_stateid.other[2];
642 	NFSUNLOCKCLSTATE();
643 	return (0);
644 }
645 
646 /*
647  * Search for a matching file, mode and, optionally, lockowner.
648  */
649 static int
650 nfscl_getopen(struct nfsclownerhead *ohp, u_int8_t *nfhp, int fhlen,
651     u_int8_t *openown, u_int8_t *lockown, u_int32_t mode,
652     struct nfscllockowner **lpp, struct nfsclopen **opp)
653 {
654 	struct nfsclowner *owp;
655 	struct nfsclopen *op, *rop, *rop2;
656 	struct nfscllockowner *lp;
657 	int keep_looping;
658 
659 	if (lpp != NULL)
660 		*lpp = NULL;
661 	/*
662 	 * rop will be set to the open to be returned. There are three
663 	 * variants of this, all for an open of the correct file:
664 	 * 1 - A match of lockown.
665 	 * 2 - A match of the openown, when no lockown match exists.
666 	 * 3 - A match for any open, if no openown or lockown match exists.
667 	 * Looking for #2 over #3 probably isn't necessary, but since
668 	 * RFC3530 is vague w.r.t. the relationship between openowners and
669 	 * lockowners, I think this is the safer way to go.
670 	 */
671 	rop = NULL;
672 	rop2 = NULL;
673 	keep_looping = 1;
674 	/* Search the client list */
675 	owp = LIST_FIRST(ohp);
676 	while (owp != NULL && keep_looping != 0) {
677 		/* and look for the correct open */
678 		op = LIST_FIRST(&owp->nfsow_open);
679 		while (op != NULL && keep_looping != 0) {
680 			if (op->nfso_fhlen == fhlen &&
681 			    !NFSBCMP(op->nfso_fh, nfhp, fhlen)
682 			    && (op->nfso_mode & mode) == mode) {
683 				if (lpp != NULL) {
684 					/* Now look for a matching lockowner. */
685 					LIST_FOREACH(lp, &op->nfso_lock,
686 					    nfsl_list) {
687 						if (!NFSBCMP(lp->nfsl_owner,
688 						    lockown,
689 						    NFSV4CL_LOCKNAMELEN)) {
690 							*lpp = lp;
691 							rop = op;
692 							keep_looping = 0;
693 							break;
694 						}
695 					}
696 				}
697 				if (rop == NULL && !NFSBCMP(owp->nfsow_owner,
698 				    openown, NFSV4CL_LOCKNAMELEN)) {
699 					rop = op;
700 					if (lpp == NULL)
701 						keep_looping = 0;
702 				}
703 				if (rop2 == NULL)
704 					rop2 = op;
705 			}
706 			op = LIST_NEXT(op, nfso_list);
707 		}
708 		owp = LIST_NEXT(owp, nfsow_list);
709 	}
710 	if (rop == NULL)
711 		rop = rop2;
712 	if (rop == NULL)
713 		return (EBADF);
714 	*opp = rop;
715 	return (0);
716 }
717 
718 /*
719  * Release use of an open owner. Called when open operations are done
720  * with the open owner.
721  */
722 APPLESTATIC void
723 nfscl_ownerrelease(struct nfsmount *nmp, struct nfsclowner *owp,
724     __unused int error, __unused int candelete, int unlocked)
725 {
726 
727 	if (owp == NULL)
728 		return;
729 	NFSLOCKCLSTATE();
730 	if (unlocked == 0) {
731 		if (NFSHASONEOPENOWN(nmp))
732 			nfsv4_relref(&owp->nfsow_rwlock);
733 		else
734 			nfscl_lockunlock(&owp->nfsow_rwlock);
735 	}
736 	nfscl_clrelease(owp->nfsow_clp);
737 	NFSUNLOCKCLSTATE();
738 }
739 
740 /*
741  * Release use of an open structure under an open owner.
742  */
743 APPLESTATIC void
744 nfscl_openrelease(struct nfsmount *nmp, struct nfsclopen *op, int error,
745     int candelete)
746 {
747 	struct nfsclclient *clp;
748 	struct nfsclowner *owp;
749 
750 	if (op == NULL)
751 		return;
752 	NFSLOCKCLSTATE();
753 	owp = op->nfso_own;
754 	if (NFSHASONEOPENOWN(nmp))
755 		nfsv4_relref(&owp->nfsow_rwlock);
756 	else
757 		nfscl_lockunlock(&owp->nfsow_rwlock);
758 	clp = owp->nfsow_clp;
759 	if (error && candelete && op->nfso_opencnt == 0)
760 		nfscl_freeopen(op, 0);
761 	nfscl_clrelease(clp);
762 	NFSUNLOCKCLSTATE();
763 }
764 
765 /*
766  * Called to get a clientid structure. It will optionally lock the
767  * client data structures to do the SetClientId/SetClientId_confirm,
768  * but will release that lock and return the clientid with a reference
769  * count on it.
770  * If the "cred" argument is NULL, a new clientid should not be created.
771  * If the "p" argument is NULL, a SetClientID/SetClientIDConfirm cannot
772  * be done.
773  * The start_renewthread argument tells nfscl_getcl() to start a renew
774  * thread if this creates a new clp.
775  * It always clpp with a reference count on it, unless returning an error.
776  */
777 APPLESTATIC int
778 nfscl_getcl(struct mount *mp, struct ucred *cred, NFSPROC_T *p,
779     int start_renewthread, struct nfsclclient **clpp)
780 {
781 	struct nfsclclient *clp;
782 	struct nfsclclient *newclp = NULL;
783 	struct nfsmount *nmp;
784 	char uuid[HOSTUUIDLEN];
785 	int igotlock = 0, error, trystalecnt, clidinusedelay, i;
786 	u_int16_t idlen = 0;
787 
788 	nmp = VFSTONFS(mp);
789 	if (cred != NULL) {
790 		getcredhostuuid(cred, uuid, sizeof uuid);
791 		idlen = strlen(uuid);
792 		if (idlen > 0)
793 			idlen += sizeof (u_int64_t);
794 		else
795 			idlen += sizeof (u_int64_t) + 16; /* 16 random bytes */
796 		MALLOC(newclp, struct nfsclclient *,
797 		    sizeof (struct nfsclclient) + idlen - 1, M_NFSCLCLIENT,
798 		    M_WAITOK | M_ZERO);
799 	}
800 	NFSLOCKCLSTATE();
801 	/*
802 	 * If a forced dismount is already in progress, don't
803 	 * allocate a new clientid and get out now. For the case where
804 	 * clp != NULL, this is a harmless optimization.
805 	 */
806 	if (NFSCL_FORCEDISM(mp)) {
807 		NFSUNLOCKCLSTATE();
808 		if (newclp != NULL)
809 			free(newclp, M_NFSCLCLIENT);
810 		return (EBADF);
811 	}
812 	clp = nmp->nm_clp;
813 	if (clp == NULL) {
814 		if (newclp == NULL) {
815 			NFSUNLOCKCLSTATE();
816 			return (EACCES);
817 		}
818 		clp = newclp;
819 		clp->nfsc_idlen = idlen;
820 		LIST_INIT(&clp->nfsc_owner);
821 		TAILQ_INIT(&clp->nfsc_deleg);
822 		TAILQ_INIT(&clp->nfsc_layout);
823 		LIST_INIT(&clp->nfsc_devinfo);
824 		for (i = 0; i < NFSCLDELEGHASHSIZE; i++)
825 			LIST_INIT(&clp->nfsc_deleghash[i]);
826 		for (i = 0; i < NFSCLLAYOUTHASHSIZE; i++)
827 			LIST_INIT(&clp->nfsc_layouthash[i]);
828 		clp->nfsc_flags = NFSCLFLAGS_INITED;
829 		clp->nfsc_clientidrev = 1;
830 		clp->nfsc_cbident = nfscl_nextcbident();
831 		nfscl_fillclid(nmp->nm_clval, uuid, clp->nfsc_id,
832 		    clp->nfsc_idlen);
833 		LIST_INSERT_HEAD(&nfsclhead, clp, nfsc_list);
834 		nmp->nm_clp = clp;
835 		clp->nfsc_nmp = nmp;
836 		NFSUNLOCKCLSTATE();
837 		if (start_renewthread != 0)
838 			nfscl_start_renewthread(clp);
839 	} else {
840 		NFSUNLOCKCLSTATE();
841 		if (newclp != NULL)
842 			free(newclp, M_NFSCLCLIENT);
843 	}
844 	NFSLOCKCLSTATE();
845 	while ((clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID) == 0 && !igotlock &&
846 	    !NFSCL_FORCEDISM(mp))
847 		igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
848 		    NFSCLSTATEMUTEXPTR, mp);
849 	if (igotlock == 0) {
850 		/*
851 		 * Call nfsv4_lock() with "iwantlock == 0" so that it will
852 		 * wait for a pending exclusive lock request.  This gives the
853 		 * exclusive lock request priority over this shared lock
854 		 * request.
855 		 * An exclusive lock on nfsc_lock is used mainly for server
856 		 * crash recoveries.
857 		 */
858 		nfsv4_lock(&clp->nfsc_lock, 0, NULL, NFSCLSTATEMUTEXPTR, mp);
859 		nfsv4_getref(&clp->nfsc_lock, NULL, NFSCLSTATEMUTEXPTR, mp);
860 	}
861 	if (igotlock == 0 && NFSCL_FORCEDISM(mp)) {
862 		/*
863 		 * Both nfsv4_lock() and nfsv4_getref() know to check
864 		 * for NFSCL_FORCEDISM() and return without sleeping to
865 		 * wait for the exclusive lock to be released, since it
866 		 * might be held by nfscl_umount() and we need to get out
867 		 * now for that case and not wait until nfscl_umount()
868 		 * releases it.
869 		 */
870 		NFSUNLOCKCLSTATE();
871 		return (EBADF);
872 	}
873 	NFSUNLOCKCLSTATE();
874 
875 	/*
876 	 * If it needs a clientid, do the setclientid now.
877 	 */
878 	if ((clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID) == 0) {
879 		if (!igotlock)
880 			panic("nfscl_clget");
881 		if (p == NULL || cred == NULL) {
882 			NFSLOCKCLSTATE();
883 			nfsv4_unlock(&clp->nfsc_lock, 0);
884 			NFSUNLOCKCLSTATE();
885 			return (EACCES);
886 		}
887 		/*
888 		 * If RFC3530 Sec. 14.2.33 is taken literally,
889 		 * NFSERR_CLIDINUSE will be returned persistently for the
890 		 * case where a new mount of the same file system is using
891 		 * a different principal. In practice, NFSERR_CLIDINUSE is
892 		 * only returned when there is outstanding unexpired state
893 		 * on the clientid. As such, try for twice the lease
894 		 * interval, if we know what that is. Otherwise, make a
895 		 * wild ass guess.
896 		 * The case of returning NFSERR_STALECLIENTID is far less
897 		 * likely, but might occur if there is a significant delay
898 		 * between doing the SetClientID and SetClientIDConfirm Ops,
899 		 * such that the server throws away the clientid before
900 		 * receiving the SetClientIDConfirm.
901 		 */
902 		if (clp->nfsc_renew > 0)
903 			clidinusedelay = NFSCL_LEASE(clp->nfsc_renew) * 2;
904 		else
905 			clidinusedelay = 120;
906 		trystalecnt = 3;
907 		do {
908 			error = nfsrpc_setclient(nmp, clp, 0, cred, p);
909 			if (error == NFSERR_STALECLIENTID ||
910 			    error == NFSERR_STALEDONTRECOVER ||
911 			    error == NFSERR_BADSESSION ||
912 			    error == NFSERR_CLIDINUSE) {
913 				(void) nfs_catnap(PZERO, error, "nfs_setcl");
914 			}
915 		} while (((error == NFSERR_STALECLIENTID ||
916 		     error == NFSERR_BADSESSION ||
917 		     error == NFSERR_STALEDONTRECOVER) && --trystalecnt > 0) ||
918 		    (error == NFSERR_CLIDINUSE && --clidinusedelay > 0));
919 		if (error) {
920 			NFSLOCKCLSTATE();
921 			nfsv4_unlock(&clp->nfsc_lock, 0);
922 			NFSUNLOCKCLSTATE();
923 			return (error);
924 		}
925 		clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
926 	}
927 	if (igotlock) {
928 		NFSLOCKCLSTATE();
929 		nfsv4_unlock(&clp->nfsc_lock, 1);
930 		NFSUNLOCKCLSTATE();
931 	}
932 
933 	*clpp = clp;
934 	return (0);
935 }
936 
937 /*
938  * Get a reference to a clientid and return it, if valid.
939  */
940 APPLESTATIC struct nfsclclient *
941 nfscl_findcl(struct nfsmount *nmp)
942 {
943 	struct nfsclclient *clp;
944 
945 	clp = nmp->nm_clp;
946 	if (clp == NULL || !(clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID))
947 		return (NULL);
948 	return (clp);
949 }
950 
951 /*
952  * Release the clientid structure. It may be locked or reference counted.
953  */
954 static void
955 nfscl_clrelease(struct nfsclclient *clp)
956 {
957 
958 	if (clp->nfsc_lock.nfslock_lock & NFSV4LOCK_LOCK)
959 		nfsv4_unlock(&clp->nfsc_lock, 0);
960 	else
961 		nfsv4_relref(&clp->nfsc_lock);
962 }
963 
964 /*
965  * External call for nfscl_clrelease.
966  */
967 APPLESTATIC void
968 nfscl_clientrelease(struct nfsclclient *clp)
969 {
970 
971 	NFSLOCKCLSTATE();
972 	if (clp->nfsc_lock.nfslock_lock & NFSV4LOCK_LOCK)
973 		nfsv4_unlock(&clp->nfsc_lock, 0);
974 	else
975 		nfsv4_relref(&clp->nfsc_lock);
976 	NFSUNLOCKCLSTATE();
977 }
978 
979 /*
980  * Called when wanting to lock a byte region.
981  */
982 APPLESTATIC int
983 nfscl_getbytelock(vnode_t vp, u_int64_t off, u_int64_t len,
984     short type, struct ucred *cred, NFSPROC_T *p, struct nfsclclient *rclp,
985     int recovery, void *id, int flags, u_int8_t *rownp, u_int8_t *ropenownp,
986     struct nfscllockowner **lpp, int *newonep, int *donelocallyp)
987 {
988 	struct nfscllockowner *lp;
989 	struct nfsclopen *op;
990 	struct nfsclclient *clp;
991 	struct nfscllockowner *nlp;
992 	struct nfscllock *nlop, *otherlop;
993 	struct nfscldeleg *dp = NULL, *ldp = NULL;
994 	struct nfscllockownerhead *lhp = NULL;
995 	struct nfsnode *np;
996 	u_int8_t own[NFSV4CL_LOCKNAMELEN], *ownp, openown[NFSV4CL_LOCKNAMELEN];
997 	u_int8_t *openownp;
998 	int error = 0, ret, donelocally = 0;
999 	u_int32_t mode;
1000 
1001 	/* For Lock Ops, the open mode doesn't matter, so use 0 to match any. */
1002 	mode = 0;
1003 	np = VTONFS(vp);
1004 	*lpp = NULL;
1005 	lp = NULL;
1006 	*newonep = 0;
1007 	*donelocallyp = 0;
1008 
1009 	/*
1010 	 * Might need these, so MALLOC them now, to
1011 	 * avoid a tsleep() in MALLOC later.
1012 	 */
1013 	MALLOC(nlp, struct nfscllockowner *,
1014 	    sizeof (struct nfscllockowner), M_NFSCLLOCKOWNER, M_WAITOK);
1015 	MALLOC(otherlop, struct nfscllock *,
1016 	    sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
1017 	MALLOC(nlop, struct nfscllock *,
1018 	    sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
1019 	nlop->nfslo_type = type;
1020 	nlop->nfslo_first = off;
1021 	if (len == NFS64BITSSET) {
1022 		nlop->nfslo_end = NFS64BITSSET;
1023 	} else {
1024 		nlop->nfslo_end = off + len;
1025 		if (nlop->nfslo_end <= nlop->nfslo_first)
1026 			error = NFSERR_INVAL;
1027 	}
1028 
1029 	if (!error) {
1030 		if (recovery)
1031 			clp = rclp;
1032 		else
1033 			error = nfscl_getcl(vnode_mount(vp), cred, p, 1, &clp);
1034 	}
1035 	if (error) {
1036 		FREE((caddr_t)nlp, M_NFSCLLOCKOWNER);
1037 		FREE((caddr_t)otherlop, M_NFSCLLOCK);
1038 		FREE((caddr_t)nlop, M_NFSCLLOCK);
1039 		return (error);
1040 	}
1041 
1042 	op = NULL;
1043 	if (recovery) {
1044 		ownp = rownp;
1045 		openownp = ropenownp;
1046 	} else {
1047 		nfscl_filllockowner(id, own, flags);
1048 		ownp = own;
1049 		if (NFSHASONEOPENOWN(VFSTONFS(vnode_mount(vp))))
1050 			nfscl_filllockowner(NULL, openown, F_POSIX);
1051 		else
1052 			nfscl_filllockowner(p->td_proc, openown, F_POSIX);
1053 		openownp = openown;
1054 	}
1055 	if (!recovery) {
1056 		NFSLOCKCLSTATE();
1057 		/*
1058 		 * First, search for a delegation. If one exists for this file,
1059 		 * the lock can be done locally against it, so long as there
1060 		 * isn't a local lock conflict.
1061 		 */
1062 		ldp = dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
1063 		    np->n_fhp->nfh_len);
1064 		/* Just sanity check for correct type of delegation */
1065 		if (dp != NULL && ((dp->nfsdl_flags &
1066 		    (NFSCLDL_RECALL | NFSCLDL_DELEGRET)) != 0 ||
1067 		     (type == F_WRLCK &&
1068 		      (dp->nfsdl_flags & NFSCLDL_WRITE) == 0)))
1069 			dp = NULL;
1070 	}
1071 	if (dp != NULL) {
1072 		/* Now, find an open and maybe a lockowner. */
1073 		ret = nfscl_getopen(&dp->nfsdl_owner, np->n_fhp->nfh_fh,
1074 		    np->n_fhp->nfh_len, openownp, ownp, mode, NULL, &op);
1075 		if (ret)
1076 			ret = nfscl_getopen(&clp->nfsc_owner,
1077 			    np->n_fhp->nfh_fh, np->n_fhp->nfh_len, openownp,
1078 			    ownp, mode, NULL, &op);
1079 		if (!ret) {
1080 			lhp = &dp->nfsdl_lock;
1081 			TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
1082 			TAILQ_INSERT_HEAD(&clp->nfsc_deleg, dp, nfsdl_list);
1083 			dp->nfsdl_timestamp = NFSD_MONOSEC + 120;
1084 			donelocally = 1;
1085 		} else {
1086 			dp = NULL;
1087 		}
1088 	}
1089 	if (!donelocally) {
1090 		/*
1091 		 * Get the related Open and maybe lockowner.
1092 		 */
1093 		error = nfscl_getopen(&clp->nfsc_owner,
1094 		    np->n_fhp->nfh_fh, np->n_fhp->nfh_len, openownp,
1095 		    ownp, mode, &lp, &op);
1096 		if (!error)
1097 			lhp = &op->nfso_lock;
1098 	}
1099 	if (!error && !recovery)
1100 		error = nfscl_localconflict(clp, np->n_fhp->nfh_fh,
1101 		    np->n_fhp->nfh_len, nlop, ownp, ldp, NULL);
1102 	if (error) {
1103 		if (!recovery) {
1104 			nfscl_clrelease(clp);
1105 			NFSUNLOCKCLSTATE();
1106 		}
1107 		FREE((caddr_t)nlp, M_NFSCLLOCKOWNER);
1108 		FREE((caddr_t)otherlop, M_NFSCLLOCK);
1109 		FREE((caddr_t)nlop, M_NFSCLLOCK);
1110 		return (error);
1111 	}
1112 
1113 	/*
1114 	 * Ok, see if a lockowner exists and create one, as required.
1115 	 */
1116 	if (lp == NULL)
1117 		LIST_FOREACH(lp, lhp, nfsl_list) {
1118 			if (!NFSBCMP(lp->nfsl_owner, ownp, NFSV4CL_LOCKNAMELEN))
1119 				break;
1120 		}
1121 	if (lp == NULL) {
1122 		NFSBCOPY(ownp, nlp->nfsl_owner, NFSV4CL_LOCKNAMELEN);
1123 		if (recovery)
1124 			NFSBCOPY(ropenownp, nlp->nfsl_openowner,
1125 			    NFSV4CL_LOCKNAMELEN);
1126 		else
1127 			NFSBCOPY(op->nfso_own->nfsow_owner, nlp->nfsl_openowner,
1128 			    NFSV4CL_LOCKNAMELEN);
1129 		nlp->nfsl_seqid = 0;
1130 		nlp->nfsl_lockflags = flags;
1131 		nlp->nfsl_inprog = NULL;
1132 		nfscl_lockinit(&nlp->nfsl_rwlock);
1133 		LIST_INIT(&nlp->nfsl_lock);
1134 		if (donelocally) {
1135 			nlp->nfsl_open = NULL;
1136 			nfsstatsv1.cllocallockowners++;
1137 		} else {
1138 			nlp->nfsl_open = op;
1139 			nfsstatsv1.cllockowners++;
1140 		}
1141 		LIST_INSERT_HEAD(lhp, nlp, nfsl_list);
1142 		lp = nlp;
1143 		nlp = NULL;
1144 		*newonep = 1;
1145 	}
1146 
1147 	/*
1148 	 * Now, update the byte ranges for locks.
1149 	 */
1150 	ret = nfscl_updatelock(lp, &nlop, &otherlop, donelocally);
1151 	if (!ret)
1152 		donelocally = 1;
1153 	if (donelocally) {
1154 		*donelocallyp = 1;
1155 		if (!recovery)
1156 			nfscl_clrelease(clp);
1157 	} else {
1158 		/*
1159 		 * Serial modifications on the lock owner for multiple threads
1160 		 * for the same process using a read/write lock.
1161 		 */
1162 		if (!recovery)
1163 			nfscl_lockexcl(&lp->nfsl_rwlock, NFSCLSTATEMUTEXPTR);
1164 	}
1165 	if (!recovery)
1166 		NFSUNLOCKCLSTATE();
1167 
1168 	if (nlp)
1169 		FREE((caddr_t)nlp, M_NFSCLLOCKOWNER);
1170 	if (nlop)
1171 		FREE((caddr_t)nlop, M_NFSCLLOCK);
1172 	if (otherlop)
1173 		FREE((caddr_t)otherlop, M_NFSCLLOCK);
1174 
1175 	*lpp = lp;
1176 	return (0);
1177 }
1178 
1179 /*
1180  * Called to unlock a byte range, for LockU.
1181  */
1182 APPLESTATIC int
1183 nfscl_relbytelock(vnode_t vp, u_int64_t off, u_int64_t len,
1184     __unused struct ucred *cred, NFSPROC_T *p, int callcnt,
1185     struct nfsclclient *clp, void *id, int flags,
1186     struct nfscllockowner **lpp, int *dorpcp)
1187 {
1188 	struct nfscllockowner *lp;
1189 	struct nfsclowner *owp;
1190 	struct nfsclopen *op;
1191 	struct nfscllock *nlop, *other_lop = NULL;
1192 	struct nfscldeleg *dp;
1193 	struct nfsnode *np;
1194 	u_int8_t own[NFSV4CL_LOCKNAMELEN];
1195 	int ret = 0, fnd;
1196 
1197 	np = VTONFS(vp);
1198 	*lpp = NULL;
1199 	*dorpcp = 0;
1200 
1201 	/*
1202 	 * Might need these, so MALLOC them now, to
1203 	 * avoid a tsleep() in MALLOC later.
1204 	 */
1205 	MALLOC(nlop, struct nfscllock *,
1206 	    sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
1207 	nlop->nfslo_type = F_UNLCK;
1208 	nlop->nfslo_first = off;
1209 	if (len == NFS64BITSSET) {
1210 		nlop->nfslo_end = NFS64BITSSET;
1211 	} else {
1212 		nlop->nfslo_end = off + len;
1213 		if (nlop->nfslo_end <= nlop->nfslo_first) {
1214 			FREE((caddr_t)nlop, M_NFSCLLOCK);
1215 			return (NFSERR_INVAL);
1216 		}
1217 	}
1218 	if (callcnt == 0) {
1219 		MALLOC(other_lop, struct nfscllock *,
1220 		    sizeof (struct nfscllock), M_NFSCLLOCK, M_WAITOK);
1221 		*other_lop = *nlop;
1222 	}
1223 	nfscl_filllockowner(id, own, flags);
1224 	dp = NULL;
1225 	NFSLOCKCLSTATE();
1226 	if (callcnt == 0)
1227 		dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
1228 		    np->n_fhp->nfh_len);
1229 
1230 	/*
1231 	 * First, unlock any local regions on a delegation.
1232 	 */
1233 	if (dp != NULL) {
1234 		/* Look for this lockowner. */
1235 		LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
1236 			if (!NFSBCMP(lp->nfsl_owner, own,
1237 			    NFSV4CL_LOCKNAMELEN))
1238 				break;
1239 		}
1240 		if (lp != NULL)
1241 			/* Use other_lop, so nlop is still available */
1242 			(void)nfscl_updatelock(lp, &other_lop, NULL, 1);
1243 	}
1244 
1245 	/*
1246 	 * Now, find a matching open/lockowner that hasn't already been done,
1247 	 * as marked by nfsl_inprog.
1248 	 */
1249 	lp = NULL;
1250 	fnd = 0;
1251 	LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
1252 	    LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
1253 		if (op->nfso_fhlen == np->n_fhp->nfh_len &&
1254 		    !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
1255 		    LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
1256 			if (lp->nfsl_inprog == NULL &&
1257 			    !NFSBCMP(lp->nfsl_owner, own,
1258 			     NFSV4CL_LOCKNAMELEN)) {
1259 				fnd = 1;
1260 				break;
1261 			}
1262 		    }
1263 		    if (fnd)
1264 			break;
1265 		}
1266 	    }
1267 	    if (fnd)
1268 		break;
1269 	}
1270 
1271 	if (lp != NULL) {
1272 		ret = nfscl_updatelock(lp, &nlop, NULL, 0);
1273 		if (ret)
1274 			*dorpcp = 1;
1275 		/*
1276 		 * Serial modifications on the lock owner for multiple
1277 		 * threads for the same process using a read/write lock.
1278 		 */
1279 		lp->nfsl_inprog = p;
1280 		nfscl_lockexcl(&lp->nfsl_rwlock, NFSCLSTATEMUTEXPTR);
1281 		*lpp = lp;
1282 	}
1283 	NFSUNLOCKCLSTATE();
1284 	if (nlop)
1285 		FREE((caddr_t)nlop, M_NFSCLLOCK);
1286 	if (other_lop)
1287 		FREE((caddr_t)other_lop, M_NFSCLLOCK);
1288 	return (0);
1289 }
1290 
1291 /*
1292  * Release all lockowners marked in progess for this process and file.
1293  */
1294 APPLESTATIC void
1295 nfscl_releasealllocks(struct nfsclclient *clp, vnode_t vp, NFSPROC_T *p,
1296     void *id, int flags)
1297 {
1298 	struct nfsclowner *owp;
1299 	struct nfsclopen *op;
1300 	struct nfscllockowner *lp;
1301 	struct nfsnode *np;
1302 	u_int8_t own[NFSV4CL_LOCKNAMELEN];
1303 
1304 	np = VTONFS(vp);
1305 	nfscl_filllockowner(id, own, flags);
1306 	NFSLOCKCLSTATE();
1307 	LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
1308 	    LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
1309 		if (op->nfso_fhlen == np->n_fhp->nfh_len &&
1310 		    !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
1311 		    LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
1312 			if (lp->nfsl_inprog == p &&
1313 			    !NFSBCMP(lp->nfsl_owner, own,
1314 			    NFSV4CL_LOCKNAMELEN)) {
1315 			    lp->nfsl_inprog = NULL;
1316 			    nfscl_lockunlock(&lp->nfsl_rwlock);
1317 			}
1318 		    }
1319 		}
1320 	    }
1321 	}
1322 	nfscl_clrelease(clp);
1323 	NFSUNLOCKCLSTATE();
1324 }
1325 
1326 /*
1327  * Called to find out if any bytes within the byte range specified are
1328  * write locked by the calling process. Used to determine if flushing
1329  * is required before a LockU.
1330  * If in doubt, return 1, so the flush will occur.
1331  */
1332 APPLESTATIC int
1333 nfscl_checkwritelocked(vnode_t vp, struct flock *fl,
1334     struct ucred *cred, NFSPROC_T *p, void *id, int flags)
1335 {
1336 	struct nfsclowner *owp;
1337 	struct nfscllockowner *lp;
1338 	struct nfsclopen *op;
1339 	struct nfsclclient *clp;
1340 	struct nfscllock *lop;
1341 	struct nfscldeleg *dp;
1342 	struct nfsnode *np;
1343 	u_int64_t off, end;
1344 	u_int8_t own[NFSV4CL_LOCKNAMELEN];
1345 	int error = 0;
1346 
1347 	np = VTONFS(vp);
1348 	switch (fl->l_whence) {
1349 	case SEEK_SET:
1350 	case SEEK_CUR:
1351 		/*
1352 		 * Caller is responsible for adding any necessary offset
1353 		 * when SEEK_CUR is used.
1354 		 */
1355 		off = fl->l_start;
1356 		break;
1357 	case SEEK_END:
1358 		off = np->n_size + fl->l_start;
1359 		break;
1360 	default:
1361 		return (1);
1362 	}
1363 	if (fl->l_len != 0) {
1364 		end = off + fl->l_len;
1365 		if (end < off)
1366 			return (1);
1367 	} else {
1368 		end = NFS64BITSSET;
1369 	}
1370 
1371 	error = nfscl_getcl(vnode_mount(vp), cred, p, 1, &clp);
1372 	if (error)
1373 		return (1);
1374 	nfscl_filllockowner(id, own, flags);
1375 	NFSLOCKCLSTATE();
1376 
1377 	/*
1378 	 * First check the delegation locks.
1379 	 */
1380 	dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
1381 	if (dp != NULL) {
1382 		LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
1383 			if (!NFSBCMP(lp->nfsl_owner, own,
1384 			    NFSV4CL_LOCKNAMELEN))
1385 				break;
1386 		}
1387 		if (lp != NULL) {
1388 			LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
1389 				if (lop->nfslo_first >= end)
1390 					break;
1391 				if (lop->nfslo_end <= off)
1392 					continue;
1393 				if (lop->nfslo_type == F_WRLCK) {
1394 					nfscl_clrelease(clp);
1395 					NFSUNLOCKCLSTATE();
1396 					return (1);
1397 				}
1398 			}
1399 		}
1400 	}
1401 
1402 	/*
1403 	 * Now, check state against the server.
1404 	 */
1405 	LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
1406 	    LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
1407 		if (op->nfso_fhlen == np->n_fhp->nfh_len &&
1408 		    !NFSBCMP(op->nfso_fh, np->n_fhp->nfh_fh, op->nfso_fhlen)) {
1409 		    LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
1410 			if (!NFSBCMP(lp->nfsl_owner, own,
1411 			    NFSV4CL_LOCKNAMELEN))
1412 			    break;
1413 		    }
1414 		    if (lp != NULL) {
1415 			LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
1416 			    if (lop->nfslo_first >= end)
1417 				break;
1418 			    if (lop->nfslo_end <= off)
1419 				continue;
1420 			    if (lop->nfslo_type == F_WRLCK) {
1421 				nfscl_clrelease(clp);
1422 				NFSUNLOCKCLSTATE();
1423 				return (1);
1424 			    }
1425 			}
1426 		    }
1427 		}
1428 	    }
1429 	}
1430 	nfscl_clrelease(clp);
1431 	NFSUNLOCKCLSTATE();
1432 	return (0);
1433 }
1434 
1435 /*
1436  * Release a byte range lock owner structure.
1437  */
1438 APPLESTATIC void
1439 nfscl_lockrelease(struct nfscllockowner *lp, int error, int candelete)
1440 {
1441 	struct nfsclclient *clp;
1442 
1443 	if (lp == NULL)
1444 		return;
1445 	NFSLOCKCLSTATE();
1446 	clp = lp->nfsl_open->nfso_own->nfsow_clp;
1447 	if (error != 0 && candelete &&
1448 	    (lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED) == 0)
1449 		nfscl_freelockowner(lp, 0);
1450 	else
1451 		nfscl_lockunlock(&lp->nfsl_rwlock);
1452 	nfscl_clrelease(clp);
1453 	NFSUNLOCKCLSTATE();
1454 }
1455 
1456 /*
1457  * Free up an open structure and any associated byte range lock structures.
1458  */
1459 APPLESTATIC void
1460 nfscl_freeopen(struct nfsclopen *op, int local)
1461 {
1462 
1463 	LIST_REMOVE(op, nfso_list);
1464 	nfscl_freealllocks(&op->nfso_lock, local);
1465 	FREE((caddr_t)op, M_NFSCLOPEN);
1466 	if (local)
1467 		nfsstatsv1.cllocalopens--;
1468 	else
1469 		nfsstatsv1.clopens--;
1470 }
1471 
1472 /*
1473  * Free up all lock owners and associated locks.
1474  */
1475 static void
1476 nfscl_freealllocks(struct nfscllockownerhead *lhp, int local)
1477 {
1478 	struct nfscllockowner *lp, *nlp;
1479 
1480 	LIST_FOREACH_SAFE(lp, lhp, nfsl_list, nlp) {
1481 		if ((lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED))
1482 			panic("nfscllckw");
1483 		nfscl_freelockowner(lp, local);
1484 	}
1485 }
1486 
1487 /*
1488  * Called for an Open when NFSERR_EXPIRED is received from the server.
1489  * If there are no byte range locks nor a Share Deny lost, try to do a
1490  * fresh Open. Otherwise, free the open.
1491  */
1492 static int
1493 nfscl_expireopen(struct nfsclclient *clp, struct nfsclopen *op,
1494     struct nfsmount *nmp, struct ucred *cred, NFSPROC_T *p)
1495 {
1496 	struct nfscllockowner *lp;
1497 	struct nfscldeleg *dp;
1498 	int mustdelete = 0, error;
1499 
1500 	/*
1501 	 * Look for any byte range lock(s).
1502 	 */
1503 	LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
1504 		if (!LIST_EMPTY(&lp->nfsl_lock)) {
1505 			mustdelete = 1;
1506 			break;
1507 		}
1508 	}
1509 
1510 	/*
1511 	 * If no byte range lock(s) nor a Share deny, try to re-open.
1512 	 */
1513 	if (!mustdelete && (op->nfso_mode & NFSLCK_DENYBITS) == 0) {
1514 		newnfs_copycred(&op->nfso_cred, cred);
1515 		dp = NULL;
1516 		error = nfsrpc_reopen(nmp, op->nfso_fh,
1517 		    op->nfso_fhlen, op->nfso_mode, op, &dp, cred, p);
1518 		if (error) {
1519 			mustdelete = 1;
1520 			if (dp != NULL) {
1521 				FREE((caddr_t)dp, M_NFSCLDELEG);
1522 				dp = NULL;
1523 			}
1524 		}
1525 		if (dp != NULL)
1526 			nfscl_deleg(nmp->nm_mountp, clp, op->nfso_fh,
1527 			    op->nfso_fhlen, cred, p, &dp);
1528 	}
1529 
1530 	/*
1531 	 * If a byte range lock or Share deny or couldn't re-open, free it.
1532 	 */
1533 	if (mustdelete)
1534 		nfscl_freeopen(op, 0);
1535 	return (mustdelete);
1536 }
1537 
1538 /*
1539  * Free up an open owner structure.
1540  */
1541 static void
1542 nfscl_freeopenowner(struct nfsclowner *owp, int local)
1543 {
1544 
1545 	LIST_REMOVE(owp, nfsow_list);
1546 	FREE((caddr_t)owp, M_NFSCLOWNER);
1547 	if (local)
1548 		nfsstatsv1.cllocalopenowners--;
1549 	else
1550 		nfsstatsv1.clopenowners--;
1551 }
1552 
1553 /*
1554  * Free up a byte range lock owner structure.
1555  */
1556 APPLESTATIC void
1557 nfscl_freelockowner(struct nfscllockowner *lp, int local)
1558 {
1559 	struct nfscllock *lop, *nlop;
1560 
1561 	LIST_REMOVE(lp, nfsl_list);
1562 	LIST_FOREACH_SAFE(lop, &lp->nfsl_lock, nfslo_list, nlop) {
1563 		nfscl_freelock(lop, local);
1564 	}
1565 	FREE((caddr_t)lp, M_NFSCLLOCKOWNER);
1566 	if (local)
1567 		nfsstatsv1.cllocallockowners--;
1568 	else
1569 		nfsstatsv1.cllockowners--;
1570 }
1571 
1572 /*
1573  * Free up a byte range lock structure.
1574  */
1575 APPLESTATIC void
1576 nfscl_freelock(struct nfscllock *lop, int local)
1577 {
1578 
1579 	LIST_REMOVE(lop, nfslo_list);
1580 	FREE((caddr_t)lop, M_NFSCLLOCK);
1581 	if (local)
1582 		nfsstatsv1.cllocallocks--;
1583 	else
1584 		nfsstatsv1.cllocks--;
1585 }
1586 
1587 /*
1588  * Clean out the state related to a delegation.
1589  */
1590 static void
1591 nfscl_cleandeleg(struct nfscldeleg *dp)
1592 {
1593 	struct nfsclowner *owp, *nowp;
1594 	struct nfsclopen *op;
1595 
1596 	LIST_FOREACH_SAFE(owp, &dp->nfsdl_owner, nfsow_list, nowp) {
1597 		op = LIST_FIRST(&owp->nfsow_open);
1598 		if (op != NULL) {
1599 			if (LIST_NEXT(op, nfso_list) != NULL)
1600 				panic("nfscleandel");
1601 			nfscl_freeopen(op, 1);
1602 		}
1603 		nfscl_freeopenowner(owp, 1);
1604 	}
1605 	nfscl_freealllocks(&dp->nfsdl_lock, 1);
1606 }
1607 
1608 /*
1609  * Free a delegation.
1610  */
1611 static void
1612 nfscl_freedeleg(struct nfscldeleghead *hdp, struct nfscldeleg *dp)
1613 {
1614 
1615 	TAILQ_REMOVE(hdp, dp, nfsdl_list);
1616 	LIST_REMOVE(dp, nfsdl_hash);
1617 	FREE((caddr_t)dp, M_NFSCLDELEG);
1618 	nfsstatsv1.cldelegates--;
1619 	nfscl_delegcnt--;
1620 }
1621 
1622 /*
1623  * Free up all state related to this client structure.
1624  */
1625 static void
1626 nfscl_cleanclient(struct nfsclclient *clp)
1627 {
1628 	struct nfsclowner *owp, *nowp;
1629 	struct nfsclopen *op, *nop;
1630 
1631 	/* Now, all the OpenOwners, etc. */
1632 	LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
1633 		LIST_FOREACH_SAFE(op, &owp->nfsow_open, nfso_list, nop) {
1634 			nfscl_freeopen(op, 0);
1635 		}
1636 		nfscl_freeopenowner(owp, 0);
1637 	}
1638 }
1639 
1640 /*
1641  * Called when an NFSERR_EXPIRED is received from the server.
1642  */
1643 static void
1644 nfscl_expireclient(struct nfsclclient *clp, struct nfsmount *nmp,
1645     struct ucred *cred, NFSPROC_T *p)
1646 {
1647 	struct nfsclowner *owp, *nowp, *towp;
1648 	struct nfsclopen *op, *nop, *top;
1649 	struct nfscldeleg *dp, *ndp;
1650 	int ret, printed = 0;
1651 
1652 	/*
1653 	 * First, merge locally issued Opens into the list for the server.
1654 	 */
1655 	dp = TAILQ_FIRST(&clp->nfsc_deleg);
1656 	while (dp != NULL) {
1657 	    ndp = TAILQ_NEXT(dp, nfsdl_list);
1658 	    owp = LIST_FIRST(&dp->nfsdl_owner);
1659 	    while (owp != NULL) {
1660 		nowp = LIST_NEXT(owp, nfsow_list);
1661 		op = LIST_FIRST(&owp->nfsow_open);
1662 		if (op != NULL) {
1663 		    if (LIST_NEXT(op, nfso_list) != NULL)
1664 			panic("nfsclexp");
1665 		    LIST_FOREACH(towp, &clp->nfsc_owner, nfsow_list) {
1666 			if (!NFSBCMP(towp->nfsow_owner, owp->nfsow_owner,
1667 			    NFSV4CL_LOCKNAMELEN))
1668 			    break;
1669 		    }
1670 		    if (towp != NULL) {
1671 			/* Merge opens in */
1672 			LIST_FOREACH(top, &towp->nfsow_open, nfso_list) {
1673 			    if (top->nfso_fhlen == op->nfso_fhlen &&
1674 				!NFSBCMP(top->nfso_fh, op->nfso_fh,
1675 				 op->nfso_fhlen)) {
1676 				top->nfso_mode |= op->nfso_mode;
1677 				top->nfso_opencnt += op->nfso_opencnt;
1678 				break;
1679 			    }
1680 			}
1681 			if (top == NULL) {
1682 			    /* Just add the open to the owner list */
1683 			    LIST_REMOVE(op, nfso_list);
1684 			    op->nfso_own = towp;
1685 			    LIST_INSERT_HEAD(&towp->nfsow_open, op, nfso_list);
1686 			    nfsstatsv1.cllocalopens--;
1687 			    nfsstatsv1.clopens++;
1688 			}
1689 		    } else {
1690 			/* Just add the openowner to the client list */
1691 			LIST_REMOVE(owp, nfsow_list);
1692 			owp->nfsow_clp = clp;
1693 			LIST_INSERT_HEAD(&clp->nfsc_owner, owp, nfsow_list);
1694 			nfsstatsv1.cllocalopenowners--;
1695 			nfsstatsv1.clopenowners++;
1696 			nfsstatsv1.cllocalopens--;
1697 			nfsstatsv1.clopens++;
1698 		    }
1699 		}
1700 		owp = nowp;
1701 	    }
1702 	    if (!printed && !LIST_EMPTY(&dp->nfsdl_lock)) {
1703 		printed = 1;
1704 		printf("nfsv4 expired locks lost\n");
1705 	    }
1706 	    nfscl_cleandeleg(dp);
1707 	    nfscl_freedeleg(&clp->nfsc_deleg, dp);
1708 	    dp = ndp;
1709 	}
1710 	if (!TAILQ_EMPTY(&clp->nfsc_deleg))
1711 	    panic("nfsclexp");
1712 
1713 	/*
1714 	 * Now, try and reopen against the server.
1715 	 */
1716 	LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
1717 		owp->nfsow_seqid = 0;
1718 		LIST_FOREACH_SAFE(op, &owp->nfsow_open, nfso_list, nop) {
1719 			ret = nfscl_expireopen(clp, op, nmp, cred, p);
1720 			if (ret && !printed) {
1721 				printed = 1;
1722 				printf("nfsv4 expired locks lost\n");
1723 			}
1724 		}
1725 		if (LIST_EMPTY(&owp->nfsow_open))
1726 			nfscl_freeopenowner(owp, 0);
1727 	}
1728 }
1729 
1730 /*
1731  * This function must be called after the process represented by "own" has
1732  * exited. Must be called with CLSTATE lock held.
1733  */
1734 static void
1735 nfscl_cleanup_common(struct nfsclclient *clp, u_int8_t *own)
1736 {
1737 	struct nfsclowner *owp, *nowp;
1738 	struct nfscllockowner *lp, *nlp;
1739 	struct nfscldeleg *dp;
1740 
1741 	/* First, get rid of local locks on delegations. */
1742 	TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
1743 		LIST_FOREACH_SAFE(lp, &dp->nfsdl_lock, nfsl_list, nlp) {
1744 		    if (!NFSBCMP(lp->nfsl_owner, own, NFSV4CL_LOCKNAMELEN)) {
1745 			if ((lp->nfsl_rwlock.nfslock_lock & NFSV4LOCK_WANTED))
1746 			    panic("nfscllckw");
1747 			nfscl_freelockowner(lp, 1);
1748 		    }
1749 		}
1750 	}
1751 	owp = LIST_FIRST(&clp->nfsc_owner);
1752 	while (owp != NULL) {
1753 		nowp = LIST_NEXT(owp, nfsow_list);
1754 		if (!NFSBCMP(owp->nfsow_owner, own,
1755 		    NFSV4CL_LOCKNAMELEN)) {
1756 			/*
1757 			 * If there are children that haven't closed the
1758 			 * file descriptors yet, the opens will still be
1759 			 * here. For that case, let the renew thread clear
1760 			 * out the OpenOwner later.
1761 			 */
1762 			if (LIST_EMPTY(&owp->nfsow_open))
1763 				nfscl_freeopenowner(owp, 0);
1764 			else
1765 				owp->nfsow_defunct = 1;
1766 		}
1767 		owp = nowp;
1768 	}
1769 }
1770 
1771 /*
1772  * Find open/lock owners for processes that have exited.
1773  */
1774 static void
1775 nfscl_cleanupkext(struct nfsclclient *clp, struct nfscllockownerfhhead *lhp)
1776 {
1777 	struct nfsclowner *owp, *nowp;
1778 	struct nfsclopen *op;
1779 	struct nfscllockowner *lp, *nlp;
1780 	struct nfscldeleg *dp;
1781 
1782 	NFSPROCLISTLOCK();
1783 	NFSLOCKCLSTATE();
1784 	LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
1785 		LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
1786 			LIST_FOREACH_SAFE(lp, &op->nfso_lock, nfsl_list, nlp) {
1787 				if (LIST_EMPTY(&lp->nfsl_lock))
1788 					nfscl_emptylockowner(lp, lhp);
1789 			}
1790 		}
1791 		if (nfscl_procdoesntexist(owp->nfsow_owner))
1792 			nfscl_cleanup_common(clp, owp->nfsow_owner);
1793 	}
1794 
1795 	/*
1796 	 * For the single open_owner case, these lock owners need to be
1797 	 * checked to see if they still exist separately.
1798 	 * This is because nfscl_procdoesntexist() never returns true for
1799 	 * the single open_owner so that the above doesn't ever call
1800 	 * nfscl_cleanup_common().
1801 	 */
1802 	TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
1803 		LIST_FOREACH_SAFE(lp, &dp->nfsdl_lock, nfsl_list, nlp) {
1804 			if (nfscl_procdoesntexist(lp->nfsl_owner))
1805 				nfscl_cleanup_common(clp, lp->nfsl_owner);
1806 		}
1807 	}
1808 	NFSUNLOCKCLSTATE();
1809 	NFSPROCLISTUNLOCK();
1810 }
1811 
1812 /*
1813  * Take the empty lock owner and move it to the local lhp list if the
1814  * associated process no longer exists.
1815  */
1816 static void
1817 nfscl_emptylockowner(struct nfscllockowner *lp,
1818     struct nfscllockownerfhhead *lhp)
1819 {
1820 	struct nfscllockownerfh *lfhp, *mylfhp;
1821 	struct nfscllockowner *nlp;
1822 	int fnd_it;
1823 
1824 	/* If not a Posix lock owner, just return. */
1825 	if ((lp->nfsl_lockflags & F_POSIX) == 0)
1826 		return;
1827 
1828 	fnd_it = 0;
1829 	mylfhp = NULL;
1830 	/*
1831 	 * First, search to see if this lock owner is already in the list.
1832 	 * If it is, then the associated process no longer exists.
1833 	 */
1834 	SLIST_FOREACH(lfhp, lhp, nfslfh_list) {
1835 		if (lfhp->nfslfh_len == lp->nfsl_open->nfso_fhlen &&
1836 		    !NFSBCMP(lfhp->nfslfh_fh, lp->nfsl_open->nfso_fh,
1837 		    lfhp->nfslfh_len))
1838 			mylfhp = lfhp;
1839 		LIST_FOREACH(nlp, &lfhp->nfslfh_lock, nfsl_list)
1840 			if (!NFSBCMP(nlp->nfsl_owner, lp->nfsl_owner,
1841 			    NFSV4CL_LOCKNAMELEN))
1842 				fnd_it = 1;
1843 	}
1844 	/* If not found, check if process still exists. */
1845 	if (fnd_it == 0 && nfscl_procdoesntexist(lp->nfsl_owner) == 0)
1846 		return;
1847 
1848 	/* Move the lock owner over to the local list. */
1849 	if (mylfhp == NULL) {
1850 		mylfhp = malloc(sizeof(struct nfscllockownerfh), M_TEMP,
1851 		    M_NOWAIT);
1852 		if (mylfhp == NULL)
1853 			return;
1854 		mylfhp->nfslfh_len = lp->nfsl_open->nfso_fhlen;
1855 		NFSBCOPY(lp->nfsl_open->nfso_fh, mylfhp->nfslfh_fh,
1856 		    mylfhp->nfslfh_len);
1857 		LIST_INIT(&mylfhp->nfslfh_lock);
1858 		SLIST_INSERT_HEAD(lhp, mylfhp, nfslfh_list);
1859 	}
1860 	LIST_REMOVE(lp, nfsl_list);
1861 	LIST_INSERT_HEAD(&mylfhp->nfslfh_lock, lp, nfsl_list);
1862 }
1863 
1864 static int	fake_global;	/* Used to force visibility of MNTK_UNMOUNTF */
1865 /*
1866  * Called from nfs umount to free up the clientid.
1867  */
1868 APPLESTATIC void
1869 nfscl_umount(struct nfsmount *nmp, NFSPROC_T *p)
1870 {
1871 	struct nfsclclient *clp;
1872 	struct ucred *cred;
1873 	int igotlock;
1874 
1875 	/*
1876 	 * For the case that matters, this is the thread that set
1877 	 * MNTK_UNMOUNTF, so it will see it set. The code that follows is
1878 	 * done to ensure that any thread executing nfscl_getcl() after
1879 	 * this time, will see MNTK_UNMOUNTF set. nfscl_getcl() uses the
1880 	 * mutex for NFSLOCKCLSTATE(), so it is "m" for the following
1881 	 * explanation, courtesy of Alan Cox.
1882 	 * What follows is a snippet from Alan Cox's email at:
1883 	 * http://docs.FreeBSD.org/cgi/
1884 	 *     mid.cgi?BANLkTikR3d65zPHo9==08ZfJ2vmqZucEvw
1885 	 *
1886 	 * 1. Set MNTK_UNMOUNTF
1887 	 * 2. Acquire a standard FreeBSD mutex "m".
1888 	 * 3. Update some data structures.
1889 	 * 4. Release mutex "m".
1890 	 *
1891 	 * Then, other threads that acquire "m" after step 4 has occurred will
1892 	 * see MNTK_UNMOUNTF as set.  But, other threads that beat thread X to
1893 	 * step 2 may or may not see MNTK_UNMOUNTF as set.
1894 	 */
1895 	NFSLOCKCLSTATE();
1896 	if ((nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF) != 0) {
1897 		fake_global++;
1898 		NFSUNLOCKCLSTATE();
1899 		NFSLOCKCLSTATE();
1900 	}
1901 
1902 	clp = nmp->nm_clp;
1903 	if (clp != NULL) {
1904 		if ((clp->nfsc_flags & NFSCLFLAGS_INITED) == 0)
1905 			panic("nfscl umount");
1906 
1907 		/*
1908 		 * First, handshake with the nfscl renew thread, to terminate
1909 		 * it.
1910 		 */
1911 		clp->nfsc_flags |= NFSCLFLAGS_UMOUNT;
1912 		while (clp->nfsc_flags & NFSCLFLAGS_HASTHREAD)
1913 			(void)mtx_sleep(clp, NFSCLSTATEMUTEXPTR, PWAIT,
1914 			    "nfsclumnt", hz);
1915 
1916 		/*
1917 		 * Now, get the exclusive lock on the client state, so
1918 		 * that no uses of the state are still in progress.
1919 		 */
1920 		do {
1921 			igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
1922 			    NFSCLSTATEMUTEXPTR, NULL);
1923 		} while (!igotlock);
1924 		NFSUNLOCKCLSTATE();
1925 
1926 		/*
1927 		 * Free up all the state. It will expire on the server, but
1928 		 * maybe we should do a SetClientId/SetClientIdConfirm so
1929 		 * the server throws it away?
1930 		 */
1931 		LIST_REMOVE(clp, nfsc_list);
1932 		nfscl_delegreturnall(clp, p);
1933 		cred = newnfs_getcred();
1934 		if (NFSHASNFSV4N(nmp)) {
1935 			(void)nfsrpc_destroysession(nmp, clp, cred, p);
1936 			(void)nfsrpc_destroyclient(nmp, clp, cred, p);
1937 		} else
1938 			(void)nfsrpc_setclient(nmp, clp, 0, cred, p);
1939 		nfscl_cleanclient(clp);
1940 		nmp->nm_clp = NULL;
1941 		NFSFREECRED(cred);
1942 		free(clp, M_NFSCLCLIENT);
1943 	} else
1944 		NFSUNLOCKCLSTATE();
1945 }
1946 
1947 /*
1948  * This function is called when a server replies with NFSERR_STALECLIENTID
1949  * NFSERR_STALESTATEID or NFSERR_BADSESSION. It traverses the clientid lists,
1950  * doing Opens and Locks with reclaim. If these fail, it deletes the
1951  * corresponding state.
1952  */
1953 static void
1954 nfscl_recover(struct nfsclclient *clp, struct ucred *cred, NFSPROC_T *p)
1955 {
1956 	struct nfsclowner *owp, *nowp;
1957 	struct nfsclopen *op, *nop;
1958 	struct nfscllockowner *lp, *nlp;
1959 	struct nfscllock *lop, *nlop;
1960 	struct nfscldeleg *dp, *ndp, *tdp;
1961 	struct nfsmount *nmp;
1962 	struct ucred *tcred;
1963 	struct nfsclopenhead extra_open;
1964 	struct nfscldeleghead extra_deleg;
1965 	struct nfsreq *rep;
1966 	u_int64_t len;
1967 	u_int32_t delegtype = NFSV4OPEN_DELEGATEWRITE, mode;
1968 	int i, igotlock = 0, error, trycnt, firstlock;
1969 	struct nfscllayout *lyp, *nlyp;
1970 
1971 	/*
1972 	 * First, lock the client structure, so everyone else will
1973 	 * block when trying to use state.
1974 	 */
1975 	NFSLOCKCLSTATE();
1976 	clp->nfsc_flags |= NFSCLFLAGS_RECVRINPROG;
1977 	do {
1978 		igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
1979 		    NFSCLSTATEMUTEXPTR, NULL);
1980 	} while (!igotlock);
1981 	NFSUNLOCKCLSTATE();
1982 
1983 	nmp = clp->nfsc_nmp;
1984 	if (nmp == NULL)
1985 		panic("nfscl recover");
1986 
1987 	/*
1988 	 * For now, just get rid of all layouts. There may be a need
1989 	 * to do LayoutCommit Ops with reclaim == true later.
1990 	 */
1991 	TAILQ_FOREACH_SAFE(lyp, &clp->nfsc_layout, nfsly_list, nlyp)
1992 		nfscl_freelayout(lyp);
1993 	TAILQ_INIT(&clp->nfsc_layout);
1994 	for (i = 0; i < NFSCLLAYOUTHASHSIZE; i++)
1995 		LIST_INIT(&clp->nfsc_layouthash[i]);
1996 
1997 	trycnt = 5;
1998 	do {
1999 		error = nfsrpc_setclient(nmp, clp, 1, cred, p);
2000 	} while ((error == NFSERR_STALECLIENTID ||
2001 	     error == NFSERR_BADSESSION ||
2002 	     error == NFSERR_STALEDONTRECOVER) && --trycnt > 0);
2003 	if (error) {
2004 		NFSLOCKCLSTATE();
2005 		clp->nfsc_flags &= ~(NFSCLFLAGS_RECOVER |
2006 		    NFSCLFLAGS_RECVRINPROG);
2007 		wakeup(&clp->nfsc_flags);
2008 		nfsv4_unlock(&clp->nfsc_lock, 0);
2009 		NFSUNLOCKCLSTATE();
2010 		return;
2011 	}
2012 	clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
2013 	clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
2014 
2015 	/*
2016 	 * Mark requests already queued on the server, so that they don't
2017 	 * initiate another recovery cycle. Any requests already in the
2018 	 * queue that handle state information will have the old stale
2019 	 * clientid/stateid and will get a NFSERR_STALESTATEID,
2020 	 * NFSERR_STALECLIENTID or NFSERR_BADSESSION reply from the server.
2021 	 * This will be translated to NFSERR_STALEDONTRECOVER when
2022 	 * R_DONTRECOVER is set.
2023 	 */
2024 	NFSLOCKREQ();
2025 	TAILQ_FOREACH(rep, &nfsd_reqq, r_chain) {
2026 		if (rep->r_nmp == nmp)
2027 			rep->r_flags |= R_DONTRECOVER;
2028 	}
2029 	NFSUNLOCKREQ();
2030 
2031 	/*
2032 	 * Now, mark all delegations "need reclaim".
2033 	 */
2034 	TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list)
2035 		dp->nfsdl_flags |= NFSCLDL_NEEDRECLAIM;
2036 
2037 	TAILQ_INIT(&extra_deleg);
2038 	LIST_INIT(&extra_open);
2039 	/*
2040 	 * Now traverse the state lists, doing Open and Lock Reclaims.
2041 	 */
2042 	tcred = newnfs_getcred();
2043 	owp = LIST_FIRST(&clp->nfsc_owner);
2044 	while (owp != NULL) {
2045 	    nowp = LIST_NEXT(owp, nfsow_list);
2046 	    owp->nfsow_seqid = 0;
2047 	    op = LIST_FIRST(&owp->nfsow_open);
2048 	    while (op != NULL) {
2049 		nop = LIST_NEXT(op, nfso_list);
2050 		if (error != NFSERR_NOGRACE && error != NFSERR_BADSESSION) {
2051 		    /* Search for a delegation to reclaim with the open */
2052 		    TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
2053 			if (!(dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM))
2054 			    continue;
2055 			if ((dp->nfsdl_flags & NFSCLDL_WRITE)) {
2056 			    mode = NFSV4OPEN_ACCESSWRITE;
2057 			    delegtype = NFSV4OPEN_DELEGATEWRITE;
2058 			} else {
2059 			    mode = NFSV4OPEN_ACCESSREAD;
2060 			    delegtype = NFSV4OPEN_DELEGATEREAD;
2061 			}
2062 			if ((op->nfso_mode & mode) == mode &&
2063 			    op->nfso_fhlen == dp->nfsdl_fhlen &&
2064 			    !NFSBCMP(op->nfso_fh, dp->nfsdl_fh, op->nfso_fhlen))
2065 			    break;
2066 		    }
2067 		    ndp = dp;
2068 		    if (dp == NULL)
2069 			delegtype = NFSV4OPEN_DELEGATENONE;
2070 		    newnfs_copycred(&op->nfso_cred, tcred);
2071 		    error = nfscl_tryopen(nmp, NULL, op->nfso_fh,
2072 			op->nfso_fhlen, op->nfso_fh, op->nfso_fhlen,
2073 			op->nfso_mode, op, NULL, 0, &ndp, 1, delegtype,
2074 			tcred, p);
2075 		    if (!error) {
2076 			/* Handle any replied delegation */
2077 			if (ndp != NULL && ((ndp->nfsdl_flags & NFSCLDL_WRITE)
2078 			    || NFSMNT_RDONLY(nmp->nm_mountp))) {
2079 			    if ((ndp->nfsdl_flags & NFSCLDL_WRITE))
2080 				mode = NFSV4OPEN_ACCESSWRITE;
2081 			    else
2082 				mode = NFSV4OPEN_ACCESSREAD;
2083 			    TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
2084 				if (!(dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM))
2085 				    continue;
2086 				if ((op->nfso_mode & mode) == mode &&
2087 				    op->nfso_fhlen == dp->nfsdl_fhlen &&
2088 				    !NFSBCMP(op->nfso_fh, dp->nfsdl_fh,
2089 				    op->nfso_fhlen)) {
2090 				    dp->nfsdl_stateid = ndp->nfsdl_stateid;
2091 				    dp->nfsdl_sizelimit = ndp->nfsdl_sizelimit;
2092 				    dp->nfsdl_ace = ndp->nfsdl_ace;
2093 				    dp->nfsdl_change = ndp->nfsdl_change;
2094 				    dp->nfsdl_flags &= ~NFSCLDL_NEEDRECLAIM;
2095 				    if ((ndp->nfsdl_flags & NFSCLDL_RECALL))
2096 					dp->nfsdl_flags |= NFSCLDL_RECALL;
2097 				    FREE((caddr_t)ndp, M_NFSCLDELEG);
2098 				    ndp = NULL;
2099 				    break;
2100 				}
2101 			    }
2102 			}
2103 			if (ndp != NULL)
2104 			    TAILQ_INSERT_HEAD(&extra_deleg, ndp, nfsdl_list);
2105 
2106 			/* and reclaim all byte range locks */
2107 			lp = LIST_FIRST(&op->nfso_lock);
2108 			while (lp != NULL) {
2109 			    nlp = LIST_NEXT(lp, nfsl_list);
2110 			    lp->nfsl_seqid = 0;
2111 			    firstlock = 1;
2112 			    lop = LIST_FIRST(&lp->nfsl_lock);
2113 			    while (lop != NULL) {
2114 				nlop = LIST_NEXT(lop, nfslo_list);
2115 				if (lop->nfslo_end == NFS64BITSSET)
2116 				    len = NFS64BITSSET;
2117 				else
2118 				    len = lop->nfslo_end - lop->nfslo_first;
2119 				error = nfscl_trylock(nmp, NULL,
2120 				    op->nfso_fh, op->nfso_fhlen, lp,
2121 				    firstlock, 1, lop->nfslo_first, len,
2122 				    lop->nfslo_type, tcred, p);
2123 				if (error != 0)
2124 				    nfscl_freelock(lop, 0);
2125 				else
2126 				    firstlock = 0;
2127 				lop = nlop;
2128 			    }
2129 			    /* If no locks, but a lockowner, just delete it. */
2130 			    if (LIST_EMPTY(&lp->nfsl_lock))
2131 				nfscl_freelockowner(lp, 0);
2132 			    lp = nlp;
2133 			}
2134 		    }
2135 		}
2136 		if (error != 0 && error != NFSERR_BADSESSION)
2137 		    nfscl_freeopen(op, 0);
2138 		op = nop;
2139 	    }
2140 	    owp = nowp;
2141 	}
2142 
2143 	/*
2144 	 * Now, try and get any delegations not yet reclaimed by cobbling
2145 	 * to-gether an appropriate open.
2146 	 */
2147 	nowp = NULL;
2148 	dp = TAILQ_FIRST(&clp->nfsc_deleg);
2149 	while (dp != NULL) {
2150 	    ndp = TAILQ_NEXT(dp, nfsdl_list);
2151 	    if ((dp->nfsdl_flags & NFSCLDL_NEEDRECLAIM)) {
2152 		if (nowp == NULL) {
2153 		    MALLOC(nowp, struct nfsclowner *,
2154 			sizeof (struct nfsclowner), M_NFSCLOWNER, M_WAITOK);
2155 		    /*
2156 		     * Name must be as long an largest possible
2157 		     * NFSV4CL_LOCKNAMELEN. 12 for now.
2158 		     */
2159 		    NFSBCOPY("RECLAIMDELEG", nowp->nfsow_owner,
2160 			NFSV4CL_LOCKNAMELEN);
2161 		    LIST_INIT(&nowp->nfsow_open);
2162 		    nowp->nfsow_clp = clp;
2163 		    nowp->nfsow_seqid = 0;
2164 		    nowp->nfsow_defunct = 0;
2165 		    nfscl_lockinit(&nowp->nfsow_rwlock);
2166 		}
2167 		nop = NULL;
2168 		if (error != NFSERR_NOGRACE && error != NFSERR_BADSESSION) {
2169 		    MALLOC(nop, struct nfsclopen *, sizeof (struct nfsclopen) +
2170 			dp->nfsdl_fhlen - 1, M_NFSCLOPEN, M_WAITOK);
2171 		    nop->nfso_own = nowp;
2172 		    if ((dp->nfsdl_flags & NFSCLDL_WRITE)) {
2173 			nop->nfso_mode = NFSV4OPEN_ACCESSWRITE;
2174 			delegtype = NFSV4OPEN_DELEGATEWRITE;
2175 		    } else {
2176 			nop->nfso_mode = NFSV4OPEN_ACCESSREAD;
2177 			delegtype = NFSV4OPEN_DELEGATEREAD;
2178 		    }
2179 		    nop->nfso_opencnt = 0;
2180 		    nop->nfso_posixlock = 1;
2181 		    nop->nfso_fhlen = dp->nfsdl_fhlen;
2182 		    NFSBCOPY(dp->nfsdl_fh, nop->nfso_fh, dp->nfsdl_fhlen);
2183 		    LIST_INIT(&nop->nfso_lock);
2184 		    nop->nfso_stateid.seqid = 0;
2185 		    nop->nfso_stateid.other[0] = 0;
2186 		    nop->nfso_stateid.other[1] = 0;
2187 		    nop->nfso_stateid.other[2] = 0;
2188 		    newnfs_copycred(&dp->nfsdl_cred, tcred);
2189 		    newnfs_copyincred(tcred, &nop->nfso_cred);
2190 		    tdp = NULL;
2191 		    error = nfscl_tryopen(nmp, NULL, nop->nfso_fh,
2192 			nop->nfso_fhlen, nop->nfso_fh, nop->nfso_fhlen,
2193 			nop->nfso_mode, nop, NULL, 0, &tdp, 1,
2194 			delegtype, tcred, p);
2195 		    if (tdp != NULL) {
2196 			if ((tdp->nfsdl_flags & NFSCLDL_WRITE))
2197 			    mode = NFSV4OPEN_ACCESSWRITE;
2198 			else
2199 			    mode = NFSV4OPEN_ACCESSREAD;
2200 			if ((nop->nfso_mode & mode) == mode &&
2201 			    nop->nfso_fhlen == tdp->nfsdl_fhlen &&
2202 			    !NFSBCMP(nop->nfso_fh, tdp->nfsdl_fh,
2203 			    nop->nfso_fhlen)) {
2204 			    dp->nfsdl_stateid = tdp->nfsdl_stateid;
2205 			    dp->nfsdl_sizelimit = tdp->nfsdl_sizelimit;
2206 			    dp->nfsdl_ace = tdp->nfsdl_ace;
2207 			    dp->nfsdl_change = tdp->nfsdl_change;
2208 			    dp->nfsdl_flags &= ~NFSCLDL_NEEDRECLAIM;
2209 			    if ((tdp->nfsdl_flags & NFSCLDL_RECALL))
2210 				dp->nfsdl_flags |= NFSCLDL_RECALL;
2211 			    FREE((caddr_t)tdp, M_NFSCLDELEG);
2212 			} else {
2213 			    TAILQ_INSERT_HEAD(&extra_deleg, tdp, nfsdl_list);
2214 			}
2215 		    }
2216 		}
2217 		if (error) {
2218 		    if (nop != NULL)
2219 			FREE((caddr_t)nop, M_NFSCLOPEN);
2220 		    /*
2221 		     * Couldn't reclaim it, so throw the state
2222 		     * away. Ouch!!
2223 		     */
2224 		    nfscl_cleandeleg(dp);
2225 		    nfscl_freedeleg(&clp->nfsc_deleg, dp);
2226 		} else {
2227 		    LIST_INSERT_HEAD(&extra_open, nop, nfso_list);
2228 		}
2229 	    }
2230 	    dp = ndp;
2231 	}
2232 
2233 	/*
2234 	 * Now, get rid of extra Opens and Delegations.
2235 	 */
2236 	LIST_FOREACH_SAFE(op, &extra_open, nfso_list, nop) {
2237 		do {
2238 			newnfs_copycred(&op->nfso_cred, tcred);
2239 			error = nfscl_tryclose(op, tcred, nmp, p);
2240 			if (error == NFSERR_GRACE)
2241 				(void) nfs_catnap(PZERO, error, "nfsexcls");
2242 		} while (error == NFSERR_GRACE);
2243 		LIST_REMOVE(op, nfso_list);
2244 		FREE((caddr_t)op, M_NFSCLOPEN);
2245 	}
2246 	if (nowp != NULL)
2247 		FREE((caddr_t)nowp, M_NFSCLOWNER);
2248 
2249 	TAILQ_FOREACH_SAFE(dp, &extra_deleg, nfsdl_list, ndp) {
2250 		do {
2251 			newnfs_copycred(&dp->nfsdl_cred, tcred);
2252 			error = nfscl_trydelegreturn(dp, tcred, nmp, p);
2253 			if (error == NFSERR_GRACE)
2254 				(void) nfs_catnap(PZERO, error, "nfsexdlg");
2255 		} while (error == NFSERR_GRACE);
2256 		TAILQ_REMOVE(&extra_deleg, dp, nfsdl_list);
2257 		FREE((caddr_t)dp, M_NFSCLDELEG);
2258 	}
2259 
2260 	/* For NFSv4.1 or later, do a RECLAIM_COMPLETE. */
2261 	if (NFSHASNFSV4N(nmp))
2262 		(void)nfsrpc_reclaimcomplete(nmp, cred, p);
2263 
2264 	NFSLOCKCLSTATE();
2265 	clp->nfsc_flags &= ~NFSCLFLAGS_RECVRINPROG;
2266 	wakeup(&clp->nfsc_flags);
2267 	nfsv4_unlock(&clp->nfsc_lock, 0);
2268 	NFSUNLOCKCLSTATE();
2269 	NFSFREECRED(tcred);
2270 }
2271 
2272 /*
2273  * This function is called when a server replies with NFSERR_EXPIRED.
2274  * It deletes all state for the client and does a fresh SetClientId/confirm.
2275  * XXX Someday it should post a signal to the process(es) that hold the
2276  * state, so they know that lock state has been lost.
2277  */
2278 APPLESTATIC int
2279 nfscl_hasexpired(struct nfsclclient *clp, u_int32_t clidrev, NFSPROC_T *p)
2280 {
2281 	struct nfsmount *nmp;
2282 	struct ucred *cred;
2283 	int igotlock = 0, error, trycnt;
2284 
2285 	/*
2286 	 * If the clientid has gone away or a new SetClientid has already
2287 	 * been done, just return ok.
2288 	 */
2289 	if (clp == NULL || clidrev != clp->nfsc_clientidrev)
2290 		return (0);
2291 
2292 	/*
2293 	 * First, lock the client structure, so everyone else will
2294 	 * block when trying to use state. Also, use NFSCLFLAGS_EXPIREIT so
2295 	 * that only one thread does the work.
2296 	 */
2297 	NFSLOCKCLSTATE();
2298 	clp->nfsc_flags |= NFSCLFLAGS_EXPIREIT;
2299 	do {
2300 		igotlock = nfsv4_lock(&clp->nfsc_lock, 1, NULL,
2301 		    NFSCLSTATEMUTEXPTR, NULL);
2302 	} while (!igotlock && (clp->nfsc_flags & NFSCLFLAGS_EXPIREIT));
2303 	if ((clp->nfsc_flags & NFSCLFLAGS_EXPIREIT) == 0) {
2304 		if (igotlock)
2305 			nfsv4_unlock(&clp->nfsc_lock, 0);
2306 		NFSUNLOCKCLSTATE();
2307 		return (0);
2308 	}
2309 	clp->nfsc_flags |= NFSCLFLAGS_RECVRINPROG;
2310 	NFSUNLOCKCLSTATE();
2311 
2312 	nmp = clp->nfsc_nmp;
2313 	if (nmp == NULL)
2314 		panic("nfscl expired");
2315 	cred = newnfs_getcred();
2316 	trycnt = 5;
2317 	do {
2318 		error = nfsrpc_setclient(nmp, clp, 0, cred, p);
2319 	} while ((error == NFSERR_STALECLIENTID ||
2320 	     error == NFSERR_BADSESSION ||
2321 	     error == NFSERR_STALEDONTRECOVER) && --trycnt > 0);
2322 	if (error) {
2323 		NFSLOCKCLSTATE();
2324 		clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
2325 	} else {
2326 		/*
2327 		 * Expire the state for the client.
2328 		 */
2329 		nfscl_expireclient(clp, nmp, cred, p);
2330 		NFSLOCKCLSTATE();
2331 		clp->nfsc_flags |= NFSCLFLAGS_HASCLIENTID;
2332 		clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
2333 	}
2334 	clp->nfsc_flags &= ~(NFSCLFLAGS_EXPIREIT | NFSCLFLAGS_RECVRINPROG);
2335 	wakeup(&clp->nfsc_flags);
2336 	nfsv4_unlock(&clp->nfsc_lock, 0);
2337 	NFSUNLOCKCLSTATE();
2338 	NFSFREECRED(cred);
2339 	return (error);
2340 }
2341 
2342 /*
2343  * This function inserts a lock in the list after insert_lop.
2344  */
2345 static void
2346 nfscl_insertlock(struct nfscllockowner *lp, struct nfscllock *new_lop,
2347     struct nfscllock *insert_lop, int local)
2348 {
2349 
2350 	if ((struct nfscllockowner *)insert_lop == lp)
2351 		LIST_INSERT_HEAD(&lp->nfsl_lock, new_lop, nfslo_list);
2352 	else
2353 		LIST_INSERT_AFTER(insert_lop, new_lop, nfslo_list);
2354 	if (local)
2355 		nfsstatsv1.cllocallocks++;
2356 	else
2357 		nfsstatsv1.cllocks++;
2358 }
2359 
2360 /*
2361  * This function updates the locking for a lock owner and given file. It
2362  * maintains a list of lock ranges ordered on increasing file offset that
2363  * are NFSCLLOCK_READ or NFSCLLOCK_WRITE and non-overlapping (aka POSIX style).
2364  * It always adds new_lop to the list and sometimes uses the one pointed
2365  * at by other_lopp.
2366  * Returns 1 if the locks were modified, 0 otherwise.
2367  */
2368 static int
2369 nfscl_updatelock(struct nfscllockowner *lp, struct nfscllock **new_lopp,
2370     struct nfscllock **other_lopp, int local)
2371 {
2372 	struct nfscllock *new_lop = *new_lopp;
2373 	struct nfscllock *lop, *tlop, *ilop;
2374 	struct nfscllock *other_lop;
2375 	int unlock = 0, modified = 0;
2376 	u_int64_t tmp;
2377 
2378 	/*
2379 	 * Work down the list until the lock is merged.
2380 	 */
2381 	if (new_lop->nfslo_type == F_UNLCK)
2382 		unlock = 1;
2383 	ilop = (struct nfscllock *)lp;
2384 	lop = LIST_FIRST(&lp->nfsl_lock);
2385 	while (lop != NULL) {
2386 	    /*
2387 	     * Only check locks for this file that aren't before the start of
2388 	     * new lock's range.
2389 	     */
2390 	    if (lop->nfslo_end >= new_lop->nfslo_first) {
2391 		if (new_lop->nfslo_end < lop->nfslo_first) {
2392 		    /*
2393 		     * If the new lock ends before the start of the
2394 		     * current lock's range, no merge, just insert
2395 		     * the new lock.
2396 		     */
2397 		    break;
2398 		}
2399 		if (new_lop->nfslo_type == lop->nfslo_type ||
2400 		    (new_lop->nfslo_first <= lop->nfslo_first &&
2401 		     new_lop->nfslo_end >= lop->nfslo_end)) {
2402 		    /*
2403 		     * This lock can be absorbed by the new lock/unlock.
2404 		     * This happens when it covers the entire range
2405 		     * of the old lock or is contiguous
2406 		     * with the old lock and is of the same type or an
2407 		     * unlock.
2408 		     */
2409 		    if (new_lop->nfslo_type != lop->nfslo_type ||
2410 			new_lop->nfslo_first != lop->nfslo_first ||
2411 			new_lop->nfslo_end != lop->nfslo_end)
2412 			modified = 1;
2413 		    if (lop->nfslo_first < new_lop->nfslo_first)
2414 			new_lop->nfslo_first = lop->nfslo_first;
2415 		    if (lop->nfslo_end > new_lop->nfslo_end)
2416 			new_lop->nfslo_end = lop->nfslo_end;
2417 		    tlop = lop;
2418 		    lop = LIST_NEXT(lop, nfslo_list);
2419 		    nfscl_freelock(tlop, local);
2420 		    continue;
2421 		}
2422 
2423 		/*
2424 		 * All these cases are for contiguous locks that are not the
2425 		 * same type, so they can't be merged.
2426 		 */
2427 		if (new_lop->nfslo_first <= lop->nfslo_first) {
2428 		    /*
2429 		     * This case is where the new lock overlaps with the
2430 		     * first part of the old lock. Move the start of the
2431 		     * old lock to just past the end of the new lock. The
2432 		     * new lock will be inserted in front of the old, since
2433 		     * ilop hasn't been updated. (We are done now.)
2434 		     */
2435 		    if (lop->nfslo_first != new_lop->nfslo_end) {
2436 			lop->nfslo_first = new_lop->nfslo_end;
2437 			modified = 1;
2438 		    }
2439 		    break;
2440 		}
2441 		if (new_lop->nfslo_end >= lop->nfslo_end) {
2442 		    /*
2443 		     * This case is where the new lock overlaps with the
2444 		     * end of the old lock's range. Move the old lock's
2445 		     * end to just before the new lock's first and insert
2446 		     * the new lock after the old lock.
2447 		     * Might not be done yet, since the new lock could
2448 		     * overlap further locks with higher ranges.
2449 		     */
2450 		    if (lop->nfslo_end != new_lop->nfslo_first) {
2451 			lop->nfslo_end = new_lop->nfslo_first;
2452 			modified = 1;
2453 		    }
2454 		    ilop = lop;
2455 		    lop = LIST_NEXT(lop, nfslo_list);
2456 		    continue;
2457 		}
2458 		/*
2459 		 * The final case is where the new lock's range is in the
2460 		 * middle of the current lock's and splits the current lock
2461 		 * up. Use *other_lopp to handle the second part of the
2462 		 * split old lock range. (We are done now.)
2463 		 * For unlock, we use new_lop as other_lop and tmp, since
2464 		 * other_lop and new_lop are the same for this case.
2465 		 * We noted the unlock case above, so we don't need
2466 		 * new_lop->nfslo_type any longer.
2467 		 */
2468 		tmp = new_lop->nfslo_first;
2469 		if (unlock) {
2470 		    other_lop = new_lop;
2471 		    *new_lopp = NULL;
2472 		} else {
2473 		    other_lop = *other_lopp;
2474 		    *other_lopp = NULL;
2475 		}
2476 		other_lop->nfslo_first = new_lop->nfslo_end;
2477 		other_lop->nfslo_end = lop->nfslo_end;
2478 		other_lop->nfslo_type = lop->nfslo_type;
2479 		lop->nfslo_end = tmp;
2480 		nfscl_insertlock(lp, other_lop, lop, local);
2481 		ilop = lop;
2482 		modified = 1;
2483 		break;
2484 	    }
2485 	    ilop = lop;
2486 	    lop = LIST_NEXT(lop, nfslo_list);
2487 	    if (lop == NULL)
2488 		break;
2489 	}
2490 
2491 	/*
2492 	 * Insert the new lock in the list at the appropriate place.
2493 	 */
2494 	if (!unlock) {
2495 		nfscl_insertlock(lp, new_lop, ilop, local);
2496 		*new_lopp = NULL;
2497 		modified = 1;
2498 	}
2499 	return (modified);
2500 }
2501 
2502 /*
2503  * This function must be run as a kernel thread.
2504  * It does Renew Ops and recovery, when required.
2505  */
2506 APPLESTATIC void
2507 nfscl_renewthread(struct nfsclclient *clp, NFSPROC_T *p)
2508 {
2509 	struct nfsclowner *owp, *nowp;
2510 	struct nfsclopen *op;
2511 	struct nfscllockowner *lp, *nlp;
2512 	struct nfscldeleghead dh;
2513 	struct nfscldeleg *dp, *ndp;
2514 	struct ucred *cred;
2515 	u_int32_t clidrev;
2516 	int error, cbpathdown, islept, igotlock, ret, clearok;
2517 	uint32_t recover_done_time = 0;
2518 	time_t mytime;
2519 	static time_t prevsec = 0;
2520 	struct nfscllockownerfh *lfhp, *nlfhp;
2521 	struct nfscllockownerfhhead lfh;
2522 	struct nfscllayout *lyp, *nlyp;
2523 	struct nfscldevinfo *dip, *ndip;
2524 	struct nfscllayouthead rlh;
2525 	struct nfsclrecalllayout *recallp;
2526 	struct nfsclds *dsp;
2527 
2528 	cred = newnfs_getcred();
2529 	NFSLOCKCLSTATE();
2530 	clp->nfsc_flags |= NFSCLFLAGS_HASTHREAD;
2531 	NFSUNLOCKCLSTATE();
2532 	for(;;) {
2533 		newnfs_setroot(cred);
2534 		cbpathdown = 0;
2535 		if (clp->nfsc_flags & NFSCLFLAGS_RECOVER) {
2536 			/*
2537 			 * Only allow one recover within 1/2 of the lease
2538 			 * duration (nfsc_renew).
2539 			 */
2540 			if (recover_done_time < NFSD_MONOSEC) {
2541 				recover_done_time = NFSD_MONOSEC +
2542 				    clp->nfsc_renew;
2543 				NFSCL_DEBUG(1, "Doing recovery..\n");
2544 				nfscl_recover(clp, cred, p);
2545 			} else {
2546 				NFSCL_DEBUG(1, "Clear Recovery dt=%u ms=%jd\n",
2547 				    recover_done_time, (intmax_t)NFSD_MONOSEC);
2548 				NFSLOCKCLSTATE();
2549 				clp->nfsc_flags &= ~NFSCLFLAGS_RECOVER;
2550 				NFSUNLOCKCLSTATE();
2551 			}
2552 		}
2553 		if (clp->nfsc_expire <= NFSD_MONOSEC &&
2554 		    (clp->nfsc_flags & NFSCLFLAGS_HASCLIENTID)) {
2555 			clp->nfsc_expire = NFSD_MONOSEC + clp->nfsc_renew;
2556 			clidrev = clp->nfsc_clientidrev;
2557 			error = nfsrpc_renew(clp, NULL, cred, p);
2558 			if (error == NFSERR_CBPATHDOWN)
2559 			    cbpathdown = 1;
2560 			else if (error == NFSERR_STALECLIENTID ||
2561 			    error == NFSERR_BADSESSION) {
2562 			    NFSLOCKCLSTATE();
2563 			    clp->nfsc_flags |= NFSCLFLAGS_RECOVER;
2564 			    NFSUNLOCKCLSTATE();
2565 			} else if (error == NFSERR_EXPIRED)
2566 			    (void) nfscl_hasexpired(clp, clidrev, p);
2567 		}
2568 
2569 checkdsrenew:
2570 		if (NFSHASNFSV4N(clp->nfsc_nmp)) {
2571 			/* Do renews for any DS sessions. */
2572 			NFSLOCKMNT(clp->nfsc_nmp);
2573 			/* Skip first entry, since the MDS is handled above. */
2574 			dsp = TAILQ_FIRST(&clp->nfsc_nmp->nm_sess);
2575 			if (dsp != NULL)
2576 				dsp = TAILQ_NEXT(dsp, nfsclds_list);
2577 			while (dsp != NULL) {
2578 				if (dsp->nfsclds_expire <= NFSD_MONOSEC &&
2579 				    dsp->nfsclds_sess.nfsess_defunct == 0) {
2580 					dsp->nfsclds_expire = NFSD_MONOSEC +
2581 					    clp->nfsc_renew;
2582 					NFSUNLOCKMNT(clp->nfsc_nmp);
2583 					(void)nfsrpc_renew(clp, dsp, cred, p);
2584 					goto checkdsrenew;
2585 				}
2586 				dsp = TAILQ_NEXT(dsp, nfsclds_list);
2587 			}
2588 			NFSUNLOCKMNT(clp->nfsc_nmp);
2589 		}
2590 
2591 		TAILQ_INIT(&dh);
2592 		NFSLOCKCLSTATE();
2593 		if (cbpathdown)
2594 			/* It's a Total Recall! */
2595 			nfscl_totalrecall(clp);
2596 
2597 		/*
2598 		 * Now, handle defunct owners.
2599 		 */
2600 		LIST_FOREACH_SAFE(owp, &clp->nfsc_owner, nfsow_list, nowp) {
2601 			if (LIST_EMPTY(&owp->nfsow_open)) {
2602 				if (owp->nfsow_defunct != 0)
2603 					nfscl_freeopenowner(owp, 0);
2604 			}
2605 		}
2606 
2607 		/*
2608 		 * Do the recall on any delegations. To avoid trouble, always
2609 		 * come back up here after having slept.
2610 		 */
2611 		igotlock = 0;
2612 tryagain:
2613 		dp = TAILQ_FIRST(&clp->nfsc_deleg);
2614 		while (dp != NULL) {
2615 			ndp = TAILQ_NEXT(dp, nfsdl_list);
2616 			if ((dp->nfsdl_flags & NFSCLDL_RECALL)) {
2617 				/*
2618 				 * Wait for outstanding I/O ops to be done.
2619 				 */
2620 				if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
2621 				    if (igotlock) {
2622 					nfsv4_unlock(&clp->nfsc_lock, 0);
2623 					igotlock = 0;
2624 				    }
2625 				    dp->nfsdl_rwlock.nfslock_lock |=
2626 					NFSV4LOCK_WANTED;
2627 				    (void) nfsmsleep(&dp->nfsdl_rwlock,
2628 					NFSCLSTATEMUTEXPTR, PZERO, "nfscld",
2629 					NULL);
2630 				    goto tryagain;
2631 				}
2632 				while (!igotlock) {
2633 				    igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
2634 					&islept, NFSCLSTATEMUTEXPTR, NULL);
2635 				    if (islept)
2636 					goto tryagain;
2637 				}
2638 				NFSUNLOCKCLSTATE();
2639 				newnfs_copycred(&dp->nfsdl_cred, cred);
2640 				ret = nfscl_recalldeleg(clp, clp->nfsc_nmp, dp,
2641 				    NULL, cred, p, 1);
2642 				if (!ret) {
2643 				    nfscl_cleandeleg(dp);
2644 				    TAILQ_REMOVE(&clp->nfsc_deleg, dp,
2645 					nfsdl_list);
2646 				    LIST_REMOVE(dp, nfsdl_hash);
2647 				    TAILQ_INSERT_HEAD(&dh, dp, nfsdl_list);
2648 				    nfscl_delegcnt--;
2649 				    nfsstatsv1.cldelegates--;
2650 				}
2651 				NFSLOCKCLSTATE();
2652 			}
2653 			dp = ndp;
2654 		}
2655 
2656 		/*
2657 		 * Clear out old delegations, if we are above the high water
2658 		 * mark. Only clear out ones with no state related to them.
2659 		 * The tailq list is in LRU order.
2660 		 */
2661 		dp = TAILQ_LAST(&clp->nfsc_deleg, nfscldeleghead);
2662 		while (nfscl_delegcnt > nfscl_deleghighwater && dp != NULL) {
2663 		    ndp = TAILQ_PREV(dp, nfscldeleghead, nfsdl_list);
2664 		    if (dp->nfsdl_rwlock.nfslock_usecnt == 0 &&
2665 			dp->nfsdl_rwlock.nfslock_lock == 0 &&
2666 			dp->nfsdl_timestamp < NFSD_MONOSEC &&
2667 			(dp->nfsdl_flags & (NFSCLDL_RECALL | NFSCLDL_ZAPPED |
2668 			  NFSCLDL_NEEDRECLAIM | NFSCLDL_DELEGRET)) == 0) {
2669 			clearok = 1;
2670 			LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
2671 			    op = LIST_FIRST(&owp->nfsow_open);
2672 			    if (op != NULL) {
2673 				clearok = 0;
2674 				break;
2675 			    }
2676 			}
2677 			if (clearok) {
2678 			    LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
2679 				if (!LIST_EMPTY(&lp->nfsl_lock)) {
2680 				    clearok = 0;
2681 				    break;
2682 				}
2683 			    }
2684 			}
2685 			if (clearok) {
2686 			    TAILQ_REMOVE(&clp->nfsc_deleg, dp, nfsdl_list);
2687 			    LIST_REMOVE(dp, nfsdl_hash);
2688 			    TAILQ_INSERT_HEAD(&dh, dp, nfsdl_list);
2689 			    nfscl_delegcnt--;
2690 			    nfsstatsv1.cldelegates--;
2691 			}
2692 		    }
2693 		    dp = ndp;
2694 		}
2695 		if (igotlock)
2696 			nfsv4_unlock(&clp->nfsc_lock, 0);
2697 
2698 		/*
2699 		 * Do the recall on any layouts. To avoid trouble, always
2700 		 * come back up here after having slept.
2701 		 */
2702 		TAILQ_INIT(&rlh);
2703 tryagain2:
2704 		TAILQ_FOREACH_SAFE(lyp, &clp->nfsc_layout, nfsly_list, nlyp) {
2705 			if ((lyp->nfsly_flags & NFSLY_RECALL) != 0) {
2706 				/*
2707 				 * Wait for outstanding I/O ops to be done.
2708 				 */
2709 				if (lyp->nfsly_lock.nfslock_usecnt > 0 ||
2710 				    (lyp->nfsly_lock.nfslock_lock &
2711 				     NFSV4LOCK_LOCK) != 0) {
2712 					lyp->nfsly_lock.nfslock_lock |=
2713 					    NFSV4LOCK_WANTED;
2714 					(void)nfsmsleep(&lyp->nfsly_lock,
2715 					    NFSCLSTATEMUTEXPTR, PZERO, "nfslyp",
2716 					    NULL);
2717 					goto tryagain2;
2718 				}
2719 				/* Move the layout to the recall list. */
2720 				TAILQ_REMOVE(&clp->nfsc_layout, lyp,
2721 				    nfsly_list);
2722 				LIST_REMOVE(lyp, nfsly_hash);
2723 				TAILQ_INSERT_HEAD(&rlh, lyp, nfsly_list);
2724 
2725 				/* Handle any layout commits. */
2726 				if (!NFSHASNOLAYOUTCOMMIT(clp->nfsc_nmp) &&
2727 				    (lyp->nfsly_flags & NFSLY_WRITTEN) != 0) {
2728 					lyp->nfsly_flags &= ~NFSLY_WRITTEN;
2729 					NFSUNLOCKCLSTATE();
2730 					NFSCL_DEBUG(3, "do layoutcommit\n");
2731 					nfscl_dolayoutcommit(clp->nfsc_nmp, lyp,
2732 					    cred, p);
2733 					NFSLOCKCLSTATE();
2734 					goto tryagain2;
2735 				}
2736 			}
2737 		}
2738 
2739 		/* Now, look for stale layouts. */
2740 		lyp = TAILQ_LAST(&clp->nfsc_layout, nfscllayouthead);
2741 		while (lyp != NULL) {
2742 			nlyp = TAILQ_PREV(lyp, nfscllayouthead, nfsly_list);
2743 			if (lyp->nfsly_timestamp < NFSD_MONOSEC &&
2744 			    (lyp->nfsly_flags & NFSLY_RECALL) == 0 &&
2745 			    lyp->nfsly_lock.nfslock_usecnt == 0 &&
2746 			    lyp->nfsly_lock.nfslock_lock == 0) {
2747 				NFSCL_DEBUG(4, "ret stale lay=%d\n",
2748 				    nfscl_layoutcnt);
2749 				recallp = malloc(sizeof(*recallp),
2750 				    M_NFSLAYRECALL, M_NOWAIT);
2751 				if (recallp == NULL)
2752 					break;
2753 				(void)nfscl_layoutrecall(NFSLAYOUTRETURN_FILE,
2754 				    lyp, NFSLAYOUTIOMODE_ANY, 0, UINT64_MAX,
2755 				    lyp->nfsly_stateid.seqid, recallp);
2756 			}
2757 			lyp = nlyp;
2758 		}
2759 
2760 		/*
2761 		 * Free up any unreferenced device info structures.
2762 		 */
2763 		LIST_FOREACH_SAFE(dip, &clp->nfsc_devinfo, nfsdi_list, ndip) {
2764 			if (dip->nfsdi_layoutrefs == 0 &&
2765 			    dip->nfsdi_refcnt == 0) {
2766 				NFSCL_DEBUG(4, "freeing devinfo\n");
2767 				LIST_REMOVE(dip, nfsdi_list);
2768 				nfscl_freedevinfo(dip);
2769 			}
2770 		}
2771 		NFSUNLOCKCLSTATE();
2772 
2773 		/* Do layout return(s), as required. */
2774 		TAILQ_FOREACH_SAFE(lyp, &rlh, nfsly_list, nlyp) {
2775 			TAILQ_REMOVE(&rlh, lyp, nfsly_list);
2776 			NFSCL_DEBUG(4, "ret layout\n");
2777 			nfscl_layoutreturn(clp->nfsc_nmp, lyp, cred, p);
2778 			nfscl_freelayout(lyp);
2779 		}
2780 
2781 		/*
2782 		 * Delegreturn any delegations cleaned out or recalled.
2783 		 */
2784 		TAILQ_FOREACH_SAFE(dp, &dh, nfsdl_list, ndp) {
2785 			newnfs_copycred(&dp->nfsdl_cred, cred);
2786 			(void) nfscl_trydelegreturn(dp, cred, clp->nfsc_nmp, p);
2787 			TAILQ_REMOVE(&dh, dp, nfsdl_list);
2788 			FREE((caddr_t)dp, M_NFSCLDELEG);
2789 		}
2790 
2791 		SLIST_INIT(&lfh);
2792 		/*
2793 		 * Call nfscl_cleanupkext() once per second to check for
2794 		 * open/lock owners where the process has exited.
2795 		 */
2796 		mytime = NFSD_MONOSEC;
2797 		if (prevsec != mytime) {
2798 			prevsec = mytime;
2799 			nfscl_cleanupkext(clp, &lfh);
2800 		}
2801 
2802 		/*
2803 		 * Do a ReleaseLockOwner for all lock owners where the
2804 		 * associated process no longer exists, as found by
2805 		 * nfscl_cleanupkext().
2806 		 */
2807 		newnfs_setroot(cred);
2808 		SLIST_FOREACH_SAFE(lfhp, &lfh, nfslfh_list, nlfhp) {
2809 			LIST_FOREACH_SAFE(lp, &lfhp->nfslfh_lock, nfsl_list,
2810 			    nlp) {
2811 				(void)nfsrpc_rellockown(clp->nfsc_nmp, lp,
2812 				    lfhp->nfslfh_fh, lfhp->nfslfh_len, cred,
2813 				    p);
2814 				nfscl_freelockowner(lp, 0);
2815 			}
2816 			free(lfhp, M_TEMP);
2817 		}
2818 		SLIST_INIT(&lfh);
2819 
2820 		NFSLOCKCLSTATE();
2821 		if ((clp->nfsc_flags & NFSCLFLAGS_RECOVER) == 0)
2822 			(void)mtx_sleep(clp, NFSCLSTATEMUTEXPTR, PWAIT, "nfscl",
2823 			    hz);
2824 		if (clp->nfsc_flags & NFSCLFLAGS_UMOUNT) {
2825 			clp->nfsc_flags &= ~NFSCLFLAGS_HASTHREAD;
2826 			NFSUNLOCKCLSTATE();
2827 			NFSFREECRED(cred);
2828 			wakeup((caddr_t)clp);
2829 			return;
2830 		}
2831 		NFSUNLOCKCLSTATE();
2832 	}
2833 }
2834 
2835 /*
2836  * Initiate state recovery. Called when NFSERR_STALECLIENTID,
2837  * NFSERR_STALESTATEID or NFSERR_BADSESSION is received.
2838  */
2839 APPLESTATIC void
2840 nfscl_initiate_recovery(struct nfsclclient *clp)
2841 {
2842 
2843 	if (clp == NULL)
2844 		return;
2845 	NFSLOCKCLSTATE();
2846 	clp->nfsc_flags |= NFSCLFLAGS_RECOVER;
2847 	NFSUNLOCKCLSTATE();
2848 	wakeup((caddr_t)clp);
2849 }
2850 
2851 /*
2852  * Dump out the state stuff for debugging.
2853  */
2854 APPLESTATIC void
2855 nfscl_dumpstate(struct nfsmount *nmp, int openowner, int opens,
2856     int lockowner, int locks)
2857 {
2858 	struct nfsclclient *clp;
2859 	struct nfsclowner *owp;
2860 	struct nfsclopen *op;
2861 	struct nfscllockowner *lp;
2862 	struct nfscllock *lop;
2863 	struct nfscldeleg *dp;
2864 
2865 	clp = nmp->nm_clp;
2866 	if (clp == NULL) {
2867 		printf("nfscl dumpstate NULL clp\n");
2868 		return;
2869 	}
2870 	NFSLOCKCLSTATE();
2871 	TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
2872 	  LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
2873 	    if (openowner && !LIST_EMPTY(&owp->nfsow_open))
2874 		printf("owner=0x%x 0x%x 0x%x 0x%x seqid=%d\n",
2875 		    owp->nfsow_owner[0], owp->nfsow_owner[1],
2876 		    owp->nfsow_owner[2], owp->nfsow_owner[3],
2877 		    owp->nfsow_seqid);
2878 	    LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
2879 		if (opens)
2880 		    printf("open st=0x%x 0x%x 0x%x cnt=%d fh12=0x%x\n",
2881 			op->nfso_stateid.other[0], op->nfso_stateid.other[1],
2882 			op->nfso_stateid.other[2], op->nfso_opencnt,
2883 			op->nfso_fh[12]);
2884 		LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
2885 		    if (lockowner)
2886 			printf("lckown=0x%x 0x%x 0x%x 0x%x seqid=%d st=0x%x 0x%x 0x%x\n",
2887 			    lp->nfsl_owner[0], lp->nfsl_owner[1],
2888 			    lp->nfsl_owner[2], lp->nfsl_owner[3],
2889 			    lp->nfsl_seqid,
2890 			    lp->nfsl_stateid.other[0], lp->nfsl_stateid.other[1],
2891 			    lp->nfsl_stateid.other[2]);
2892 		    LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
2893 			if (locks)
2894 #ifdef __FreeBSD__
2895 			    printf("lck typ=%d fst=%ju end=%ju\n",
2896 				lop->nfslo_type, (intmax_t)lop->nfslo_first,
2897 				(intmax_t)lop->nfslo_end);
2898 #else
2899 			    printf("lck typ=%d fst=%qd end=%qd\n",
2900 				lop->nfslo_type, lop->nfslo_first,
2901 				lop->nfslo_end);
2902 #endif
2903 		    }
2904 		}
2905 	    }
2906 	  }
2907 	}
2908 	LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
2909 	    if (openowner && !LIST_EMPTY(&owp->nfsow_open))
2910 		printf("owner=0x%x 0x%x 0x%x 0x%x seqid=%d\n",
2911 		    owp->nfsow_owner[0], owp->nfsow_owner[1],
2912 		    owp->nfsow_owner[2], owp->nfsow_owner[3],
2913 		    owp->nfsow_seqid);
2914 	    LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
2915 		if (opens)
2916 		    printf("open st=0x%x 0x%x 0x%x cnt=%d fh12=0x%x\n",
2917 			op->nfso_stateid.other[0], op->nfso_stateid.other[1],
2918 			op->nfso_stateid.other[2], op->nfso_opencnt,
2919 			op->nfso_fh[12]);
2920 		LIST_FOREACH(lp, &op->nfso_lock, nfsl_list) {
2921 		    if (lockowner)
2922 			printf("lckown=0x%x 0x%x 0x%x 0x%x seqid=%d st=0x%x 0x%x 0x%x\n",
2923 			    lp->nfsl_owner[0], lp->nfsl_owner[1],
2924 			    lp->nfsl_owner[2], lp->nfsl_owner[3],
2925 			    lp->nfsl_seqid,
2926 			    lp->nfsl_stateid.other[0], lp->nfsl_stateid.other[1],
2927 			    lp->nfsl_stateid.other[2]);
2928 		    LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
2929 			if (locks)
2930 #ifdef __FreeBSD__
2931 			    printf("lck typ=%d fst=%ju end=%ju\n",
2932 				lop->nfslo_type, (intmax_t)lop->nfslo_first,
2933 				(intmax_t)lop->nfslo_end);
2934 #else
2935 			    printf("lck typ=%d fst=%qd end=%qd\n",
2936 				lop->nfslo_type, lop->nfslo_first,
2937 				lop->nfslo_end);
2938 #endif
2939 		    }
2940 		}
2941 	    }
2942 	}
2943 	NFSUNLOCKCLSTATE();
2944 }
2945 
2946 /*
2947  * Check for duplicate open owners and opens.
2948  * (Only used as a diagnostic aid.)
2949  */
2950 APPLESTATIC void
2951 nfscl_dupopen(vnode_t vp, int dupopens)
2952 {
2953 	struct nfsclclient *clp;
2954 	struct nfsclowner *owp, *owp2;
2955 	struct nfsclopen *op, *op2;
2956 	struct nfsfh *nfhp;
2957 
2958 	clp = VFSTONFS(vnode_mount(vp))->nm_clp;
2959 	if (clp == NULL) {
2960 		printf("nfscl dupopen NULL clp\n");
2961 		return;
2962 	}
2963 	nfhp = VTONFS(vp)->n_fhp;
2964 	NFSLOCKCLSTATE();
2965 
2966 	/*
2967 	 * First, search for duplicate owners.
2968 	 * These should never happen!
2969 	 */
2970 	LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
2971 	    LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
2972 		if (owp != owp2 &&
2973 		    !NFSBCMP(owp->nfsow_owner, owp2->nfsow_owner,
2974 		    NFSV4CL_LOCKNAMELEN)) {
2975 			NFSUNLOCKCLSTATE();
2976 			printf("DUP OWNER\n");
2977 			nfscl_dumpstate(VFSTONFS(vnode_mount(vp)), 1, 1, 0, 0);
2978 			return;
2979 		}
2980 	    }
2981 	}
2982 
2983 	/*
2984 	 * Now, search for duplicate stateids.
2985 	 * These shouldn't happen, either.
2986 	 */
2987 	LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
2988 	    LIST_FOREACH(op2, &owp2->nfsow_open, nfso_list) {
2989 		LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
2990 		    LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
2991 			if (op != op2 &&
2992 			    (op->nfso_stateid.other[0] != 0 ||
2993 			     op->nfso_stateid.other[1] != 0 ||
2994 			     op->nfso_stateid.other[2] != 0) &&
2995 			    op->nfso_stateid.other[0] == op2->nfso_stateid.other[0] &&
2996 			    op->nfso_stateid.other[1] == op2->nfso_stateid.other[1] &&
2997 			    op->nfso_stateid.other[2] == op2->nfso_stateid.other[2]) {
2998 			    NFSUNLOCKCLSTATE();
2999 			    printf("DUP STATEID\n");
3000 			    nfscl_dumpstate(VFSTONFS(vnode_mount(vp)), 1, 1, 0,
3001 				0);
3002 			    return;
3003 			}
3004 		    }
3005 		}
3006 	    }
3007 	}
3008 
3009 	/*
3010 	 * Now search for duplicate opens.
3011 	 * Duplicate opens for the same owner
3012 	 * should never occur. Other duplicates are
3013 	 * possible and are checked for if "dupopens"
3014 	 * is true.
3015 	 */
3016 	LIST_FOREACH(owp2, &clp->nfsc_owner, nfsow_list) {
3017 	    LIST_FOREACH(op2, &owp2->nfsow_open, nfso_list) {
3018 		if (nfhp->nfh_len == op2->nfso_fhlen &&
3019 		    !NFSBCMP(nfhp->nfh_fh, op2->nfso_fh, nfhp->nfh_len)) {
3020 		    LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
3021 			LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
3022 			    if (op != op2 && nfhp->nfh_len == op->nfso_fhlen &&
3023 				!NFSBCMP(nfhp->nfh_fh, op->nfso_fh, nfhp->nfh_len) &&
3024 				(!NFSBCMP(op->nfso_own->nfsow_owner,
3025 				 op2->nfso_own->nfsow_owner, NFSV4CL_LOCKNAMELEN) ||
3026 				 dupopens)) {
3027 				if (!NFSBCMP(op->nfso_own->nfsow_owner,
3028 				    op2->nfso_own->nfsow_owner, NFSV4CL_LOCKNAMELEN)) {
3029 				    NFSUNLOCKCLSTATE();
3030 				    printf("BADDUP OPEN\n");
3031 				} else {
3032 				    NFSUNLOCKCLSTATE();
3033 				    printf("DUP OPEN\n");
3034 				}
3035 				nfscl_dumpstate(VFSTONFS(vnode_mount(vp)), 1, 1,
3036 				    0, 0);
3037 				return;
3038 			    }
3039 			}
3040 		    }
3041 		}
3042 	    }
3043 	}
3044 	NFSUNLOCKCLSTATE();
3045 }
3046 
3047 /*
3048  * During close, find an open that needs to be dereferenced and
3049  * dereference it. If there are no more opens for this file,
3050  * log a message to that effect.
3051  * Opens aren't actually Close'd until VOP_INACTIVE() is performed
3052  * on the file's vnode.
3053  * This is the safe way, since it is difficult to identify
3054  * which open the close is for and I/O can be performed after the
3055  * close(2) system call when a file is mmap'd.
3056  * If it returns 0 for success, there will be a referenced
3057  * clp returned via clpp.
3058  */
3059 APPLESTATIC int
3060 nfscl_getclose(vnode_t vp, struct nfsclclient **clpp)
3061 {
3062 	struct nfsclclient *clp;
3063 	struct nfsclowner *owp;
3064 	struct nfsclopen *op;
3065 	struct nfscldeleg *dp;
3066 	struct nfsfh *nfhp;
3067 	int error, notdecr;
3068 
3069 	error = nfscl_getcl(vnode_mount(vp), NULL, NULL, 1, &clp);
3070 	if (error)
3071 		return (error);
3072 	*clpp = clp;
3073 
3074 	nfhp = VTONFS(vp)->n_fhp;
3075 	notdecr = 1;
3076 	NFSLOCKCLSTATE();
3077 	/*
3078 	 * First, look for one under a delegation that was locally issued
3079 	 * and just decrement the opencnt for it. Since all my Opens against
3080 	 * the server are DENY_NONE, I don't see a problem with hanging
3081 	 * onto them. (It is much easier to use one of the extant Opens
3082 	 * that I already have on the server when a Delegation is recalled
3083 	 * than to do fresh Opens.) Someday, I might need to rethink this, but.
3084 	 */
3085 	dp = nfscl_finddeleg(clp, nfhp->nfh_fh, nfhp->nfh_len);
3086 	if (dp != NULL) {
3087 		LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
3088 			op = LIST_FIRST(&owp->nfsow_open);
3089 			if (op != NULL) {
3090 				/*
3091 				 * Since a delegation is for a file, there
3092 				 * should never be more than one open for
3093 				 * each openowner.
3094 				 */
3095 				if (LIST_NEXT(op, nfso_list) != NULL)
3096 					panic("nfscdeleg opens");
3097 				if (notdecr && op->nfso_opencnt > 0) {
3098 					notdecr = 0;
3099 					op->nfso_opencnt--;
3100 					break;
3101 				}
3102 			}
3103 		}
3104 	}
3105 
3106 	/* Now process the opens against the server. */
3107 	LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
3108 		LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
3109 			if (op->nfso_fhlen == nfhp->nfh_len &&
3110 			    !NFSBCMP(op->nfso_fh, nfhp->nfh_fh,
3111 			    nfhp->nfh_len)) {
3112 				/* Found an open, decrement cnt if possible */
3113 				if (notdecr && op->nfso_opencnt > 0) {
3114 					notdecr = 0;
3115 					op->nfso_opencnt--;
3116 				}
3117 				/*
3118 				 * There are more opens, so just return.
3119 				 */
3120 				if (op->nfso_opencnt > 0) {
3121 					NFSUNLOCKCLSTATE();
3122 					return (0);
3123 				}
3124 			}
3125 		}
3126 	}
3127 	NFSUNLOCKCLSTATE();
3128 	if (notdecr)
3129 		printf("nfscl: never fnd open\n");
3130 	return (0);
3131 }
3132 
3133 APPLESTATIC int
3134 nfscl_doclose(vnode_t vp, struct nfsclclient **clpp, NFSPROC_T *p)
3135 {
3136 	struct nfsclclient *clp;
3137 	struct nfsclowner *owp, *nowp;
3138 	struct nfsclopen *op;
3139 	struct nfscldeleg *dp;
3140 	struct nfsfh *nfhp;
3141 	struct nfsclrecalllayout *recallp;
3142 	int error;
3143 
3144 	error = nfscl_getcl(vnode_mount(vp), NULL, NULL, 1, &clp);
3145 	if (error)
3146 		return (error);
3147 	*clpp = clp;
3148 
3149 	nfhp = VTONFS(vp)->n_fhp;
3150 	recallp = malloc(sizeof(*recallp), M_NFSLAYRECALL, M_WAITOK);
3151 	NFSLOCKCLSTATE();
3152 	/*
3153 	 * First get rid of the local Open structures, which should be no
3154 	 * longer in use.
3155 	 */
3156 	dp = nfscl_finddeleg(clp, nfhp->nfh_fh, nfhp->nfh_len);
3157 	if (dp != NULL) {
3158 		LIST_FOREACH_SAFE(owp, &dp->nfsdl_owner, nfsow_list, nowp) {
3159 			op = LIST_FIRST(&owp->nfsow_open);
3160 			if (op != NULL) {
3161 				KASSERT((op->nfso_opencnt == 0),
3162 				    ("nfscl: bad open cnt on deleg"));
3163 				nfscl_freeopen(op, 1);
3164 			}
3165 			nfscl_freeopenowner(owp, 1);
3166 		}
3167 	}
3168 
3169 	/* Return any layouts marked return on close. */
3170 	nfscl_retoncloselayout(vp, clp, nfhp->nfh_fh, nfhp->nfh_len, &recallp);
3171 
3172 	/* Now process the opens against the server. */
3173 lookformore:
3174 	LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
3175 		op = LIST_FIRST(&owp->nfsow_open);
3176 		while (op != NULL) {
3177 			if (op->nfso_fhlen == nfhp->nfh_len &&
3178 			    !NFSBCMP(op->nfso_fh, nfhp->nfh_fh,
3179 			    nfhp->nfh_len)) {
3180 				/* Found an open, close it. */
3181 				KASSERT((op->nfso_opencnt == 0),
3182 				    ("nfscl: bad open cnt on server"));
3183 				NFSUNLOCKCLSTATE();
3184 				nfsrpc_doclose(VFSTONFS(vnode_mount(vp)), op,
3185 				    p);
3186 				NFSLOCKCLSTATE();
3187 				goto lookformore;
3188 			}
3189 			op = LIST_NEXT(op, nfso_list);
3190 		}
3191 	}
3192 	NFSUNLOCKCLSTATE();
3193 	/*
3194 	 * recallp has been set NULL by nfscl_retoncloselayout() if it was
3195 	 * used by the function, but calling free() with a NULL pointer is ok.
3196 	 */
3197 	free(recallp, M_NFSLAYRECALL);
3198 	return (0);
3199 }
3200 
3201 /*
3202  * Return all delegations on this client.
3203  * (Must be called with client sleep lock.)
3204  */
3205 static void
3206 nfscl_delegreturnall(struct nfsclclient *clp, NFSPROC_T *p)
3207 {
3208 	struct nfscldeleg *dp, *ndp;
3209 	struct ucred *cred;
3210 
3211 	cred = newnfs_getcred();
3212 	TAILQ_FOREACH_SAFE(dp, &clp->nfsc_deleg, nfsdl_list, ndp) {
3213 		nfscl_cleandeleg(dp);
3214 		(void) nfscl_trydelegreturn(dp, cred, clp->nfsc_nmp, p);
3215 		nfscl_freedeleg(&clp->nfsc_deleg, dp);
3216 	}
3217 	NFSFREECRED(cred);
3218 }
3219 
3220 /*
3221  * Do a callback RPC.
3222  */
3223 APPLESTATIC void
3224 nfscl_docb(struct nfsrv_descript *nd, NFSPROC_T *p)
3225 {
3226 	int clist, gotseq_ok, i, j, k, op, rcalls;
3227 	u_int32_t *tl;
3228 	struct nfsclclient *clp;
3229 	struct nfscldeleg *dp = NULL;
3230 	int numops, taglen = -1, error = 0, trunc;
3231 	u_int32_t minorvers = 0, retops = 0, *retopsp = NULL, *repp, cbident;
3232 	u_char tag[NFSV4_SMALLSTR + 1], *tagstr;
3233 	vnode_t vp = NULL;
3234 	struct nfsnode *np;
3235 	struct vattr va;
3236 	struct nfsfh *nfhp;
3237 	mount_t mp;
3238 	nfsattrbit_t attrbits, rattrbits;
3239 	nfsv4stateid_t stateid;
3240 	uint32_t seqid, slotid = 0, highslot, cachethis;
3241 	uint8_t sessionid[NFSX_V4SESSIONID];
3242 	struct mbuf *rep;
3243 	struct nfscllayout *lyp;
3244 	uint64_t filesid[2], len, off;
3245 	int changed, gotone, laytype, recalltype;
3246 	uint32_t iomode;
3247 	struct nfsclrecalllayout *recallp = NULL;
3248 	struct nfsclsession *tsep;
3249 
3250 	gotseq_ok = 0;
3251 	nfsrvd_rephead(nd);
3252 	NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
3253 	taglen = fxdr_unsigned(int, *tl);
3254 	if (taglen < 0) {
3255 		error = EBADRPC;
3256 		goto nfsmout;
3257 	}
3258 	if (taglen <= NFSV4_SMALLSTR)
3259 		tagstr = tag;
3260 	else
3261 		tagstr = malloc(taglen + 1, M_TEMP, M_WAITOK);
3262 	error = nfsrv_mtostr(nd, tagstr, taglen);
3263 	if (error) {
3264 		if (taglen > NFSV4_SMALLSTR)
3265 			free(tagstr, M_TEMP);
3266 		taglen = -1;
3267 		goto nfsmout;
3268 	}
3269 	(void) nfsm_strtom(nd, tag, taglen);
3270 	if (taglen > NFSV4_SMALLSTR) {
3271 		free(tagstr, M_TEMP);
3272 	}
3273 	NFSM_BUILD(retopsp, u_int32_t *, NFSX_UNSIGNED);
3274 	NFSM_DISSECT(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
3275 	minorvers = fxdr_unsigned(u_int32_t, *tl++);
3276 	if (minorvers != NFSV4_MINORVERSION && minorvers != NFSV41_MINORVERSION)
3277 		nd->nd_repstat = NFSERR_MINORVERMISMATCH;
3278 	cbident = fxdr_unsigned(u_int32_t, *tl++);
3279 	if (nd->nd_repstat)
3280 		numops = 0;
3281 	else
3282 		numops = fxdr_unsigned(int, *tl);
3283 	/*
3284 	 * Loop around doing the sub ops.
3285 	 */
3286 	for (i = 0; i < numops; i++) {
3287 		NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
3288 		NFSM_BUILD(repp, u_int32_t *, 2 * NFSX_UNSIGNED);
3289 		*repp++ = *tl;
3290 		op = fxdr_unsigned(int, *tl);
3291 		if (op < NFSV4OP_CBGETATTR ||
3292 		   (op > NFSV4OP_CBRECALL && minorvers == NFSV4_MINORVERSION) ||
3293 		   (op > NFSV4OP_CBNOTIFYDEVID &&
3294 		    minorvers == NFSV41_MINORVERSION)) {
3295 		    nd->nd_repstat = NFSERR_OPILLEGAL;
3296 		    *repp = nfscl_errmap(nd, minorvers);
3297 		    retops++;
3298 		    break;
3299 		}
3300 		nd->nd_procnum = op;
3301 		if (op < NFSV41_CBNOPS)
3302 			nfsstatsv1.cbrpccnt[nd->nd_procnum]++;
3303 		switch (op) {
3304 		case NFSV4OP_CBGETATTR:
3305 			NFSCL_DEBUG(4, "cbgetattr\n");
3306 			mp = NULL;
3307 			vp = NULL;
3308 			error = nfsm_getfh(nd, &nfhp);
3309 			if (!error)
3310 				error = nfsrv_getattrbits(nd, &attrbits,
3311 				    NULL, NULL);
3312 			if (error == 0 && i == 0 &&
3313 			    minorvers != NFSV4_MINORVERSION)
3314 				error = NFSERR_OPNOTINSESS;
3315 			if (!error) {
3316 				mp = nfscl_getmnt(minorvers, sessionid, cbident,
3317 				    &clp);
3318 				if (mp == NULL)
3319 					error = NFSERR_SERVERFAULT;
3320 			}
3321 			if (!error) {
3322 				error = nfscl_ngetreopen(mp, nfhp->nfh_fh,
3323 				    nfhp->nfh_len, p, &np);
3324 				if (!error)
3325 					vp = NFSTOV(np);
3326 			}
3327 			if (!error) {
3328 				NFSZERO_ATTRBIT(&rattrbits);
3329 				NFSLOCKCLSTATE();
3330 				dp = nfscl_finddeleg(clp, nfhp->nfh_fh,
3331 				    nfhp->nfh_len);
3332 				if (dp != NULL) {
3333 					if (NFSISSET_ATTRBIT(&attrbits,
3334 					    NFSATTRBIT_SIZE)) {
3335 						if (vp != NULL)
3336 							va.va_size = np->n_size;
3337 						else
3338 							va.va_size =
3339 							    dp->nfsdl_size;
3340 						NFSSETBIT_ATTRBIT(&rattrbits,
3341 						    NFSATTRBIT_SIZE);
3342 					}
3343 					if (NFSISSET_ATTRBIT(&attrbits,
3344 					    NFSATTRBIT_CHANGE)) {
3345 						va.va_filerev =
3346 						    dp->nfsdl_change;
3347 						if (vp == NULL ||
3348 						    (np->n_flag & NDELEGMOD))
3349 							va.va_filerev++;
3350 						NFSSETBIT_ATTRBIT(&rattrbits,
3351 						    NFSATTRBIT_CHANGE);
3352 					}
3353 				} else
3354 					error = NFSERR_SERVERFAULT;
3355 				NFSUNLOCKCLSTATE();
3356 			}
3357 			if (vp != NULL)
3358 				vrele(vp);
3359 			if (mp != NULL)
3360 				vfs_unbusy(mp);
3361 			if (nfhp != NULL)
3362 				FREE((caddr_t)nfhp, M_NFSFH);
3363 			if (!error)
3364 				(void) nfsv4_fillattr(nd, NULL, NULL, NULL, &va,
3365 				    NULL, 0, &rattrbits, NULL, p, 0, 0, 0, 0,
3366 				    (uint64_t)0);
3367 			break;
3368 		case NFSV4OP_CBRECALL:
3369 			NFSCL_DEBUG(4, "cbrecall\n");
3370 			NFSM_DISSECT(tl, u_int32_t *, NFSX_STATEID +
3371 			    NFSX_UNSIGNED);
3372 			stateid.seqid = *tl++;
3373 			NFSBCOPY((caddr_t)tl, (caddr_t)stateid.other,
3374 			    NFSX_STATEIDOTHER);
3375 			tl += (NFSX_STATEIDOTHER / NFSX_UNSIGNED);
3376 			trunc = fxdr_unsigned(int, *tl);
3377 			error = nfsm_getfh(nd, &nfhp);
3378 			if (error == 0 && i == 0 &&
3379 			    minorvers != NFSV4_MINORVERSION)
3380 				error = NFSERR_OPNOTINSESS;
3381 			if (!error) {
3382 				NFSLOCKCLSTATE();
3383 				if (minorvers == NFSV4_MINORVERSION)
3384 					clp = nfscl_getclnt(cbident);
3385 				else
3386 					clp = nfscl_getclntsess(sessionid);
3387 				if (clp != NULL) {
3388 					dp = nfscl_finddeleg(clp, nfhp->nfh_fh,
3389 					    nfhp->nfh_len);
3390 					if (dp != NULL && (dp->nfsdl_flags &
3391 					    NFSCLDL_DELEGRET) == 0) {
3392 						dp->nfsdl_flags |=
3393 						    NFSCLDL_RECALL;
3394 						wakeup((caddr_t)clp);
3395 					}
3396 				} else {
3397 					error = NFSERR_SERVERFAULT;
3398 				}
3399 				NFSUNLOCKCLSTATE();
3400 			}
3401 			if (nfhp != NULL)
3402 				FREE((caddr_t)nfhp, M_NFSFH);
3403 			break;
3404 		case NFSV4OP_CBLAYOUTRECALL:
3405 			NFSCL_DEBUG(4, "cblayrec\n");
3406 			nfhp = NULL;
3407 			NFSM_DISSECT(tl, uint32_t *, 4 * NFSX_UNSIGNED);
3408 			laytype = fxdr_unsigned(int, *tl++);
3409 			iomode = fxdr_unsigned(uint32_t, *tl++);
3410 			if (newnfs_true == *tl++)
3411 				changed = 1;
3412 			else
3413 				changed = 0;
3414 			recalltype = fxdr_unsigned(int, *tl);
3415 			recallp = malloc(sizeof(*recallp), M_NFSLAYRECALL,
3416 			    M_WAITOK);
3417 			if (laytype != NFSLAYOUT_NFSV4_1_FILES)
3418 				error = NFSERR_NOMATCHLAYOUT;
3419 			else if (recalltype == NFSLAYOUTRETURN_FILE) {
3420 				error = nfsm_getfh(nd, &nfhp);
3421 				NFSCL_DEBUG(4, "retfile getfh=%d\n", error);
3422 				if (error != 0)
3423 					goto nfsmout;
3424 				NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_HYPER +
3425 				    NFSX_STATEID);
3426 				off = fxdr_hyper(tl); tl += 2;
3427 				len = fxdr_hyper(tl); tl += 2;
3428 				stateid.seqid = fxdr_unsigned(uint32_t, *tl++);
3429 				NFSBCOPY(tl, stateid.other, NFSX_STATEIDOTHER);
3430 				if (minorvers == NFSV4_MINORVERSION)
3431 					error = NFSERR_NOTSUPP;
3432 				else if (i == 0)
3433 					error = NFSERR_OPNOTINSESS;
3434 				if (error == 0) {
3435 					NFSLOCKCLSTATE();
3436 					clp = nfscl_getclntsess(sessionid);
3437 					NFSCL_DEBUG(4, "cbly clp=%p\n", clp);
3438 					if (clp != NULL) {
3439 						lyp = nfscl_findlayout(clp,
3440 						    nfhp->nfh_fh,
3441 						    nfhp->nfh_len);
3442 						NFSCL_DEBUG(4, "cblyp=%p\n",
3443 						    lyp);
3444 						if (lyp != NULL &&
3445 						    (lyp->nfsly_flags &
3446 						     NFSLY_FILES) != 0 &&
3447 						    !NFSBCMP(stateid.other,
3448 						    lyp->nfsly_stateid.other,
3449 						    NFSX_STATEIDOTHER)) {
3450 							error =
3451 							    nfscl_layoutrecall(
3452 							    recalltype,
3453 							    lyp, iomode, off,
3454 							    len, stateid.seqid,
3455 							    recallp);
3456 							recallp = NULL;
3457 							wakeup(clp);
3458 							NFSCL_DEBUG(4,
3459 							    "aft layrcal=%d\n",
3460 							    error);
3461 						} else
3462 							error =
3463 							  NFSERR_NOMATCHLAYOUT;
3464 					} else
3465 						error = NFSERR_NOMATCHLAYOUT;
3466 					NFSUNLOCKCLSTATE();
3467 				}
3468 				free(nfhp, M_NFSFH);
3469 			} else if (recalltype == NFSLAYOUTRETURN_FSID) {
3470 				NFSM_DISSECT(tl, uint32_t *, 2 * NFSX_HYPER);
3471 				filesid[0] = fxdr_hyper(tl); tl += 2;
3472 				filesid[1] = fxdr_hyper(tl); tl += 2;
3473 				gotone = 0;
3474 				NFSLOCKCLSTATE();
3475 				clp = nfscl_getclntsess(sessionid);
3476 				if (clp != NULL) {
3477 					TAILQ_FOREACH(lyp, &clp->nfsc_layout,
3478 					    nfsly_list) {
3479 						if (lyp->nfsly_filesid[0] ==
3480 						    filesid[0] &&
3481 						    lyp->nfsly_filesid[1] ==
3482 						    filesid[1]) {
3483 							error =
3484 							    nfscl_layoutrecall(
3485 							    recalltype,
3486 							    lyp, iomode, 0,
3487 							    UINT64_MAX,
3488 							    lyp->nfsly_stateid.seqid,
3489 							    recallp);
3490 							recallp = NULL;
3491 							gotone = 1;
3492 						}
3493 					}
3494 					if (gotone != 0)
3495 						wakeup(clp);
3496 					else
3497 						error = NFSERR_NOMATCHLAYOUT;
3498 				} else
3499 					error = NFSERR_NOMATCHLAYOUT;
3500 				NFSUNLOCKCLSTATE();
3501 			} else if (recalltype == NFSLAYOUTRETURN_ALL) {
3502 				gotone = 0;
3503 				NFSLOCKCLSTATE();
3504 				clp = nfscl_getclntsess(sessionid);
3505 				if (clp != NULL) {
3506 					TAILQ_FOREACH(lyp, &clp->nfsc_layout,
3507 					    nfsly_list) {
3508 						error = nfscl_layoutrecall(
3509 						    recalltype, lyp, iomode, 0,
3510 						    UINT64_MAX,
3511 						    lyp->nfsly_stateid.seqid,
3512 						    recallp);
3513 						recallp = NULL;
3514 						gotone = 1;
3515 					}
3516 					if (gotone != 0)
3517 						wakeup(clp);
3518 					else
3519 						error = NFSERR_NOMATCHLAYOUT;
3520 				} else
3521 					error = NFSERR_NOMATCHLAYOUT;
3522 				NFSUNLOCKCLSTATE();
3523 			} else
3524 				error = NFSERR_NOMATCHLAYOUT;
3525 			if (recallp != NULL) {
3526 				free(recallp, M_NFSLAYRECALL);
3527 				recallp = NULL;
3528 			}
3529 			break;
3530 		case NFSV4OP_CBSEQUENCE:
3531 			NFSM_DISSECT(tl, uint32_t *, NFSX_V4SESSIONID +
3532 			    5 * NFSX_UNSIGNED);
3533 			bcopy(tl, sessionid, NFSX_V4SESSIONID);
3534 			tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
3535 			seqid = fxdr_unsigned(uint32_t, *tl++);
3536 			slotid = fxdr_unsigned(uint32_t, *tl++);
3537 			highslot = fxdr_unsigned(uint32_t, *tl++);
3538 			cachethis = *tl++;
3539 			/* Throw away the referring call stuff. */
3540 			clist = fxdr_unsigned(int, *tl);
3541 			for (j = 0; j < clist; j++) {
3542 				NFSM_DISSECT(tl, uint32_t *, NFSX_V4SESSIONID +
3543 				    NFSX_UNSIGNED);
3544 				tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
3545 				rcalls = fxdr_unsigned(int, *tl);
3546 				for (k = 0; k < rcalls; k++) {
3547 					NFSM_DISSECT(tl, uint32_t *,
3548 					    2 * NFSX_UNSIGNED);
3549 				}
3550 			}
3551 			NFSLOCKCLSTATE();
3552 			if (i == 0) {
3553 				clp = nfscl_getclntsess(sessionid);
3554 				if (clp == NULL)
3555 					error = NFSERR_SERVERFAULT;
3556 			} else
3557 				error = NFSERR_SEQUENCEPOS;
3558 			if (error == 0) {
3559 				tsep = nfsmnt_mdssession(clp->nfsc_nmp);
3560 				error = nfsv4_seqsession(seqid, slotid,
3561 				    highslot, tsep->nfsess_cbslots, &rep,
3562 				    tsep->nfsess_backslots);
3563 			}
3564 			NFSUNLOCKCLSTATE();
3565 			if (error == 0 || error == NFSERR_REPLYFROMCACHE) {
3566 				gotseq_ok = 1;
3567 				if (rep != NULL) {
3568 					/*
3569 					 * Handle a reply for a retried
3570 					 * callback.  The reply will be
3571 					 * re-inserted in the session cache
3572 					 * by the nfsv4_seqsess_cacherep() call
3573 					 * after out:
3574 					 */
3575 					KASSERT(error == NFSERR_REPLYFROMCACHE,
3576 					    ("cbsequence: non-NULL rep"));
3577 					NFSCL_DEBUG(4, "Got cbretry\n");
3578 					m_freem(nd->nd_mreq);
3579 					nd->nd_mreq = rep;
3580 					rep = NULL;
3581 					goto out;
3582 				}
3583 				NFSM_BUILD(tl, uint32_t *,
3584 				    NFSX_V4SESSIONID + 4 * NFSX_UNSIGNED);
3585 				bcopy(sessionid, tl, NFSX_V4SESSIONID);
3586 				tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
3587 				*tl++ = txdr_unsigned(seqid);
3588 				*tl++ = txdr_unsigned(slotid);
3589 				*tl++ = txdr_unsigned(NFSV4_CBSLOTS - 1);
3590 				*tl = txdr_unsigned(NFSV4_CBSLOTS - 1);
3591 			}
3592 			break;
3593 		default:
3594 			if (i == 0 && minorvers == NFSV41_MINORVERSION)
3595 				error = NFSERR_OPNOTINSESS;
3596 			else {
3597 				NFSCL_DEBUG(1, "unsupp callback %d\n", op);
3598 				error = NFSERR_NOTSUPP;
3599 			}
3600 			break;
3601 		}
3602 		if (error) {
3603 			if (error == EBADRPC || error == NFSERR_BADXDR) {
3604 				nd->nd_repstat = NFSERR_BADXDR;
3605 			} else {
3606 				nd->nd_repstat = error;
3607 			}
3608 			error = 0;
3609 		}
3610 		retops++;
3611 		if (nd->nd_repstat) {
3612 			*repp = nfscl_errmap(nd, minorvers);
3613 			break;
3614 		} else
3615 			*repp = 0;	/* NFS4_OK */
3616 	}
3617 nfsmout:
3618 	if (recallp != NULL)
3619 		free(recallp, M_NFSLAYRECALL);
3620 	if (error) {
3621 		if (error == EBADRPC || error == NFSERR_BADXDR)
3622 			nd->nd_repstat = NFSERR_BADXDR;
3623 		else
3624 			printf("nfsv4 comperr1=%d\n", error);
3625 	}
3626 	if (taglen == -1) {
3627 		NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
3628 		*tl++ = 0;
3629 		*tl = 0;
3630 	} else {
3631 		*retopsp = txdr_unsigned(retops);
3632 	}
3633 	*nd->nd_errp = nfscl_errmap(nd, minorvers);
3634 out:
3635 	if (gotseq_ok != 0) {
3636 		rep = m_copym(nd->nd_mreq, 0, M_COPYALL, M_WAITOK);
3637 		NFSLOCKCLSTATE();
3638 		clp = nfscl_getclntsess(sessionid);
3639 		if (clp != NULL) {
3640 			tsep = nfsmnt_mdssession(clp->nfsc_nmp);
3641 			nfsv4_seqsess_cacherep(slotid, tsep->nfsess_cbslots,
3642 			    NFSERR_OK, &rep);
3643 			NFSUNLOCKCLSTATE();
3644 		} else {
3645 			NFSUNLOCKCLSTATE();
3646 			m_freem(rep);
3647 		}
3648 	}
3649 }
3650 
3651 /*
3652  * Generate the next cbident value. Basically just increment a static value
3653  * and then check that it isn't already in the list, if it has wrapped around.
3654  */
3655 static u_int32_t
3656 nfscl_nextcbident(void)
3657 {
3658 	struct nfsclclient *clp;
3659 	int matched;
3660 	static u_int32_t nextcbident = 0;
3661 	static int haswrapped = 0;
3662 
3663 	nextcbident++;
3664 	if (nextcbident == 0)
3665 		haswrapped = 1;
3666 	if (haswrapped) {
3667 		/*
3668 		 * Search the clientid list for one already using this cbident.
3669 		 */
3670 		do {
3671 			matched = 0;
3672 			NFSLOCKCLSTATE();
3673 			LIST_FOREACH(clp, &nfsclhead, nfsc_list) {
3674 				if (clp->nfsc_cbident == nextcbident) {
3675 					matched = 1;
3676 					break;
3677 				}
3678 			}
3679 			NFSUNLOCKCLSTATE();
3680 			if (matched == 1)
3681 				nextcbident++;
3682 		} while (matched);
3683 	}
3684 	return (nextcbident);
3685 }
3686 
3687 /*
3688  * Get the mount point related to a given cbident or session and busy it.
3689  */
3690 static mount_t
3691 nfscl_getmnt(int minorvers, uint8_t *sessionid, u_int32_t cbident,
3692     struct nfsclclient **clpp)
3693 {
3694 	struct nfsclclient *clp;
3695 	mount_t mp;
3696 	int error;
3697 	struct nfsclsession *tsep;
3698 
3699 	*clpp = NULL;
3700 	NFSLOCKCLSTATE();
3701 	LIST_FOREACH(clp, &nfsclhead, nfsc_list) {
3702 		tsep = nfsmnt_mdssession(clp->nfsc_nmp);
3703 		if (minorvers == NFSV4_MINORVERSION) {
3704 			if (clp->nfsc_cbident == cbident)
3705 				break;
3706 		} else if (!NFSBCMP(tsep->nfsess_sessionid, sessionid,
3707 		    NFSX_V4SESSIONID))
3708 			break;
3709 	}
3710 	if (clp == NULL) {
3711 		NFSUNLOCKCLSTATE();
3712 		return (NULL);
3713 	}
3714 	mp = clp->nfsc_nmp->nm_mountp;
3715 	vfs_ref(mp);
3716 	NFSUNLOCKCLSTATE();
3717 	error = vfs_busy(mp, 0);
3718 	vfs_rel(mp);
3719 	if (error != 0)
3720 		return (NULL);
3721 	*clpp = clp;
3722 	return (mp);
3723 }
3724 
3725 /*
3726  * Get the clientid pointer related to a given cbident.
3727  */
3728 static struct nfsclclient *
3729 nfscl_getclnt(u_int32_t cbident)
3730 {
3731 	struct nfsclclient *clp;
3732 
3733 	LIST_FOREACH(clp, &nfsclhead, nfsc_list)
3734 		if (clp->nfsc_cbident == cbident)
3735 			break;
3736 	return (clp);
3737 }
3738 
3739 /*
3740  * Get the clientid pointer related to a given sessionid.
3741  */
3742 static struct nfsclclient *
3743 nfscl_getclntsess(uint8_t *sessionid)
3744 {
3745 	struct nfsclclient *clp;
3746 	struct nfsclsession *tsep;
3747 
3748 	LIST_FOREACH(clp, &nfsclhead, nfsc_list) {
3749 		tsep = nfsmnt_mdssession(clp->nfsc_nmp);
3750 		if (!NFSBCMP(tsep->nfsess_sessionid, sessionid,
3751 		    NFSX_V4SESSIONID))
3752 			break;
3753 	}
3754 	return (clp);
3755 }
3756 
3757 /*
3758  * Search for a lock conflict locally on the client. A conflict occurs if
3759  * - not same owner and overlapping byte range and at least one of them is
3760  *   a write lock or this is an unlock.
3761  */
3762 static int
3763 nfscl_localconflict(struct nfsclclient *clp, u_int8_t *fhp, int fhlen,
3764     struct nfscllock *nlop, u_int8_t *own, struct nfscldeleg *dp,
3765     struct nfscllock **lopp)
3766 {
3767 	struct nfsclowner *owp;
3768 	struct nfsclopen *op;
3769 	int ret;
3770 
3771 	if (dp != NULL) {
3772 		ret = nfscl_checkconflict(&dp->nfsdl_lock, nlop, own, lopp);
3773 		if (ret)
3774 			return (ret);
3775 	}
3776 	LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
3777 		LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
3778 			if (op->nfso_fhlen == fhlen &&
3779 			    !NFSBCMP(op->nfso_fh, fhp, fhlen)) {
3780 				ret = nfscl_checkconflict(&op->nfso_lock, nlop,
3781 				    own, lopp);
3782 				if (ret)
3783 					return (ret);
3784 			}
3785 		}
3786 	}
3787 	return (0);
3788 }
3789 
3790 static int
3791 nfscl_checkconflict(struct nfscllockownerhead *lhp, struct nfscllock *nlop,
3792     u_int8_t *own, struct nfscllock **lopp)
3793 {
3794 	struct nfscllockowner *lp;
3795 	struct nfscllock *lop;
3796 
3797 	LIST_FOREACH(lp, lhp, nfsl_list) {
3798 		if (NFSBCMP(lp->nfsl_owner, own, NFSV4CL_LOCKNAMELEN)) {
3799 			LIST_FOREACH(lop, &lp->nfsl_lock, nfslo_list) {
3800 				if (lop->nfslo_first >= nlop->nfslo_end)
3801 					break;
3802 				if (lop->nfslo_end <= nlop->nfslo_first)
3803 					continue;
3804 				if (lop->nfslo_type == F_WRLCK ||
3805 				    nlop->nfslo_type == F_WRLCK ||
3806 				    nlop->nfslo_type == F_UNLCK) {
3807 					if (lopp != NULL)
3808 						*lopp = lop;
3809 					return (NFSERR_DENIED);
3810 				}
3811 			}
3812 		}
3813 	}
3814 	return (0);
3815 }
3816 
3817 /*
3818  * Check for a local conflicting lock.
3819  */
3820 APPLESTATIC int
3821 nfscl_lockt(vnode_t vp, struct nfsclclient *clp, u_int64_t off,
3822     u_int64_t len, struct flock *fl, NFSPROC_T *p, void *id, int flags)
3823 {
3824 	struct nfscllock *lop, nlck;
3825 	struct nfscldeleg *dp;
3826 	struct nfsnode *np;
3827 	u_int8_t own[NFSV4CL_LOCKNAMELEN];
3828 	int error;
3829 
3830 	nlck.nfslo_type = fl->l_type;
3831 	nlck.nfslo_first = off;
3832 	if (len == NFS64BITSSET) {
3833 		nlck.nfslo_end = NFS64BITSSET;
3834 	} else {
3835 		nlck.nfslo_end = off + len;
3836 		if (nlck.nfslo_end <= nlck.nfslo_first)
3837 			return (NFSERR_INVAL);
3838 	}
3839 	np = VTONFS(vp);
3840 	nfscl_filllockowner(id, own, flags);
3841 	NFSLOCKCLSTATE();
3842 	dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
3843 	error = nfscl_localconflict(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len,
3844 	    &nlck, own, dp, &lop);
3845 	if (error != 0) {
3846 		fl->l_whence = SEEK_SET;
3847 		fl->l_start = lop->nfslo_first;
3848 		if (lop->nfslo_end == NFS64BITSSET)
3849 			fl->l_len = 0;
3850 		else
3851 			fl->l_len = lop->nfslo_end - lop->nfslo_first;
3852 		fl->l_pid = (pid_t)0;
3853 		fl->l_type = lop->nfslo_type;
3854 		error = -1;			/* no RPC required */
3855 	} else if (dp != NULL && ((dp->nfsdl_flags & NFSCLDL_WRITE) ||
3856 	    fl->l_type == F_RDLCK)) {
3857 		/*
3858 		 * The delegation ensures that there isn't a conflicting
3859 		 * lock on the server, so return -1 to indicate an RPC
3860 		 * isn't required.
3861 		 */
3862 		fl->l_type = F_UNLCK;
3863 		error = -1;
3864 	}
3865 	NFSUNLOCKCLSTATE();
3866 	return (error);
3867 }
3868 
3869 /*
3870  * Handle Recall of a delegation.
3871  * The clp must be exclusive locked when this is called.
3872  */
3873 static int
3874 nfscl_recalldeleg(struct nfsclclient *clp, struct nfsmount *nmp,
3875     struct nfscldeleg *dp, vnode_t vp, struct ucred *cred, NFSPROC_T *p,
3876     int called_from_renewthread)
3877 {
3878 	struct nfsclowner *owp, *lowp, *nowp;
3879 	struct nfsclopen *op, *lop;
3880 	struct nfscllockowner *lp;
3881 	struct nfscllock *lckp;
3882 	struct nfsnode *np;
3883 	int error = 0, ret, gotvp = 0;
3884 
3885 	if (vp == NULL) {
3886 		/*
3887 		 * First, get a vnode for the file. This is needed to do RPCs.
3888 		 */
3889 		ret = nfscl_ngetreopen(nmp->nm_mountp, dp->nfsdl_fh,
3890 		    dp->nfsdl_fhlen, p, &np);
3891 		if (ret) {
3892 			/*
3893 			 * File isn't open, so nothing to move over to the
3894 			 * server.
3895 			 */
3896 			return (0);
3897 		}
3898 		vp = NFSTOV(np);
3899 		gotvp = 1;
3900 	} else {
3901 		np = VTONFS(vp);
3902 	}
3903 	dp->nfsdl_flags &= ~NFSCLDL_MODTIMESET;
3904 
3905 	/*
3906 	 * Ok, if it's a write delegation, flush data to the server, so
3907 	 * that close/open consistency is retained.
3908 	 */
3909 	ret = 0;
3910 	NFSLOCKNODE(np);
3911 	if ((dp->nfsdl_flags & NFSCLDL_WRITE) && (np->n_flag & NMODIFIED)) {
3912 		np->n_flag |= NDELEGRECALL;
3913 		NFSUNLOCKNODE(np);
3914 		ret = ncl_flush(vp, MNT_WAIT, p, 1, called_from_renewthread);
3915 		NFSLOCKNODE(np);
3916 		np->n_flag &= ~NDELEGRECALL;
3917 	}
3918 	NFSINVALATTRCACHE(np);
3919 	NFSUNLOCKNODE(np);
3920 	if (ret == EIO && called_from_renewthread != 0) {
3921 		/*
3922 		 * If the flush failed with EIO for the renew thread,
3923 		 * return now, so that the dirty buffer will be flushed
3924 		 * later.
3925 		 */
3926 		if (gotvp != 0)
3927 			vrele(vp);
3928 		return (ret);
3929 	}
3930 
3931 	/*
3932 	 * Now, for each openowner with opens issued locally, move them
3933 	 * over to state against the server.
3934 	 */
3935 	LIST_FOREACH(lowp, &dp->nfsdl_owner, nfsow_list) {
3936 		lop = LIST_FIRST(&lowp->nfsow_open);
3937 		if (lop != NULL) {
3938 			if (LIST_NEXT(lop, nfso_list) != NULL)
3939 				panic("nfsdlg mult opens");
3940 			/*
3941 			 * Look for the same openowner against the server.
3942 			 */
3943 			LIST_FOREACH(owp, &clp->nfsc_owner, nfsow_list) {
3944 				if (!NFSBCMP(lowp->nfsow_owner,
3945 				    owp->nfsow_owner, NFSV4CL_LOCKNAMELEN)) {
3946 					newnfs_copycred(&dp->nfsdl_cred, cred);
3947 					ret = nfscl_moveopen(vp, clp, nmp, lop,
3948 					    owp, dp, cred, p);
3949 					if (ret == NFSERR_STALECLIENTID ||
3950 					    ret == NFSERR_STALEDONTRECOVER ||
3951 					    ret == NFSERR_BADSESSION) {
3952 						if (gotvp)
3953 							vrele(vp);
3954 						return (ret);
3955 					}
3956 					if (ret) {
3957 						nfscl_freeopen(lop, 1);
3958 						if (!error)
3959 							error = ret;
3960 					}
3961 					break;
3962 				}
3963 			}
3964 
3965 			/*
3966 			 * If no openowner found, create one and get an open
3967 			 * for it.
3968 			 */
3969 			if (owp == NULL) {
3970 				MALLOC(nowp, struct nfsclowner *,
3971 				    sizeof (struct nfsclowner), M_NFSCLOWNER,
3972 				    M_WAITOK);
3973 				nfscl_newopen(clp, NULL, &owp, &nowp, &op,
3974 				    NULL, lowp->nfsow_owner, dp->nfsdl_fh,
3975 				    dp->nfsdl_fhlen, NULL, NULL);
3976 				newnfs_copycred(&dp->nfsdl_cred, cred);
3977 				ret = nfscl_moveopen(vp, clp, nmp, lop,
3978 				    owp, dp, cred, p);
3979 				if (ret) {
3980 					nfscl_freeopenowner(owp, 0);
3981 					if (ret == NFSERR_STALECLIENTID ||
3982 					    ret == NFSERR_STALEDONTRECOVER ||
3983 					    ret == NFSERR_BADSESSION) {
3984 						if (gotvp)
3985 							vrele(vp);
3986 						return (ret);
3987 					}
3988 					if (ret) {
3989 						nfscl_freeopen(lop, 1);
3990 						if (!error)
3991 							error = ret;
3992 					}
3993 				}
3994 			}
3995 		}
3996 	}
3997 
3998 	/*
3999 	 * Now, get byte range locks for any locks done locally.
4000 	 */
4001 	LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
4002 		LIST_FOREACH(lckp, &lp->nfsl_lock, nfslo_list) {
4003 			newnfs_copycred(&dp->nfsdl_cred, cred);
4004 			ret = nfscl_relock(vp, clp, nmp, lp, lckp, cred, p);
4005 			if (ret == NFSERR_STALESTATEID ||
4006 			    ret == NFSERR_STALEDONTRECOVER ||
4007 			    ret == NFSERR_STALECLIENTID ||
4008 			    ret == NFSERR_BADSESSION) {
4009 				if (gotvp)
4010 					vrele(vp);
4011 				return (ret);
4012 			}
4013 			if (ret && !error)
4014 				error = ret;
4015 		}
4016 	}
4017 	if (gotvp)
4018 		vrele(vp);
4019 	return (error);
4020 }
4021 
4022 /*
4023  * Move a locally issued open over to an owner on the state list.
4024  * SIDE EFFECT: If it needs to sleep (do an rpc), it unlocks clstate and
4025  * returns with it unlocked.
4026  */
4027 static int
4028 nfscl_moveopen(vnode_t vp, struct nfsclclient *clp, struct nfsmount *nmp,
4029     struct nfsclopen *lop, struct nfsclowner *owp, struct nfscldeleg *dp,
4030     struct ucred *cred, NFSPROC_T *p)
4031 {
4032 	struct nfsclopen *op, *nop;
4033 	struct nfscldeleg *ndp;
4034 	struct nfsnode *np;
4035 	int error = 0, newone;
4036 
4037 	/*
4038 	 * First, look for an appropriate open, If found, just increment the
4039 	 * opencnt in it.
4040 	 */
4041 	LIST_FOREACH(op, &owp->nfsow_open, nfso_list) {
4042 		if ((op->nfso_mode & lop->nfso_mode) == lop->nfso_mode &&
4043 		    op->nfso_fhlen == lop->nfso_fhlen &&
4044 		    !NFSBCMP(op->nfso_fh, lop->nfso_fh, op->nfso_fhlen)) {
4045 			op->nfso_opencnt += lop->nfso_opencnt;
4046 			nfscl_freeopen(lop, 1);
4047 			return (0);
4048 		}
4049 	}
4050 
4051 	/* No appropriate open, so we have to do one against the server. */
4052 	np = VTONFS(vp);
4053 	MALLOC(nop, struct nfsclopen *, sizeof (struct nfsclopen) +
4054 	    lop->nfso_fhlen - 1, M_NFSCLOPEN, M_WAITOK);
4055 	newone = 0;
4056 	nfscl_newopen(clp, NULL, &owp, NULL, &op, &nop, owp->nfsow_owner,
4057 	    lop->nfso_fh, lop->nfso_fhlen, cred, &newone);
4058 	ndp = dp;
4059 	error = nfscl_tryopen(nmp, vp, np->n_v4->n4_data, np->n_v4->n4_fhlen,
4060 	    lop->nfso_fh, lop->nfso_fhlen, lop->nfso_mode, op,
4061 	    NFS4NODENAME(np->n_v4), np->n_v4->n4_namelen, &ndp, 0, 0, cred, p);
4062 	if (error) {
4063 		if (newone)
4064 			nfscl_freeopen(op, 0);
4065 	} else {
4066 		op->nfso_mode |= lop->nfso_mode;
4067 		op->nfso_opencnt += lop->nfso_opencnt;
4068 		nfscl_freeopen(lop, 1);
4069 	}
4070 	if (nop != NULL)
4071 		FREE((caddr_t)nop, M_NFSCLOPEN);
4072 	if (ndp != NULL) {
4073 		/*
4074 		 * What should I do with the returned delegation, since the
4075 		 * delegation is being recalled? For now, just printf and
4076 		 * through it away.
4077 		 */
4078 		printf("Moveopen returned deleg\n");
4079 		FREE((caddr_t)ndp, M_NFSCLDELEG);
4080 	}
4081 	return (error);
4082 }
4083 
4084 /*
4085  * Recall all delegations on this client.
4086  */
4087 static void
4088 nfscl_totalrecall(struct nfsclclient *clp)
4089 {
4090 	struct nfscldeleg *dp;
4091 
4092 	TAILQ_FOREACH(dp, &clp->nfsc_deleg, nfsdl_list) {
4093 		if ((dp->nfsdl_flags & NFSCLDL_DELEGRET) == 0)
4094 			dp->nfsdl_flags |= NFSCLDL_RECALL;
4095 	}
4096 }
4097 
4098 /*
4099  * Relock byte ranges. Called for delegation recall and state expiry.
4100  */
4101 static int
4102 nfscl_relock(vnode_t vp, struct nfsclclient *clp, struct nfsmount *nmp,
4103     struct nfscllockowner *lp, struct nfscllock *lop, struct ucred *cred,
4104     NFSPROC_T *p)
4105 {
4106 	struct nfscllockowner *nlp;
4107 	struct nfsfh *nfhp;
4108 	u_int64_t off, len;
4109 	u_int32_t clidrev = 0;
4110 	int error, newone, donelocally;
4111 
4112 	off = lop->nfslo_first;
4113 	len = lop->nfslo_end - lop->nfslo_first;
4114 	error = nfscl_getbytelock(vp, off, len, lop->nfslo_type, cred, p,
4115 	    clp, 1, NULL, lp->nfsl_lockflags, lp->nfsl_owner,
4116 	    lp->nfsl_openowner, &nlp, &newone, &donelocally);
4117 	if (error || donelocally)
4118 		return (error);
4119 	if (nmp->nm_clp != NULL)
4120 		clidrev = nmp->nm_clp->nfsc_clientidrev;
4121 	else
4122 		clidrev = 0;
4123 	nfhp = VTONFS(vp)->n_fhp;
4124 	error = nfscl_trylock(nmp, vp, nfhp->nfh_fh,
4125 	    nfhp->nfh_len, nlp, newone, 0, off,
4126 	    len, lop->nfslo_type, cred, p);
4127 	if (error)
4128 		nfscl_freelockowner(nlp, 0);
4129 	return (error);
4130 }
4131 
4132 /*
4133  * Called to re-open a file. Basically get a vnode for the file handle
4134  * and then call nfsrpc_openrpc() to do the rest.
4135  */
4136 static int
4137 nfsrpc_reopen(struct nfsmount *nmp, u_int8_t *fhp, int fhlen,
4138     u_int32_t mode, struct nfsclopen *op, struct nfscldeleg **dpp,
4139     struct ucred *cred, NFSPROC_T *p)
4140 {
4141 	struct nfsnode *np;
4142 	vnode_t vp;
4143 	int error;
4144 
4145 	error = nfscl_ngetreopen(nmp->nm_mountp, fhp, fhlen, p, &np);
4146 	if (error)
4147 		return (error);
4148 	vp = NFSTOV(np);
4149 	if (np->n_v4 != NULL) {
4150 		error = nfscl_tryopen(nmp, vp, np->n_v4->n4_data,
4151 		    np->n_v4->n4_fhlen, fhp, fhlen, mode, op,
4152 		    NFS4NODENAME(np->n_v4), np->n_v4->n4_namelen, dpp, 0, 0,
4153 		    cred, p);
4154 	} else {
4155 		error = EINVAL;
4156 	}
4157 	vrele(vp);
4158 	return (error);
4159 }
4160 
4161 /*
4162  * Try an open against the server. Just call nfsrpc_openrpc(), retrying while
4163  * NFSERR_DELAY. Also, try system credentials, if the passed in credentials
4164  * fail.
4165  */
4166 static int
4167 nfscl_tryopen(struct nfsmount *nmp, vnode_t vp, u_int8_t *fhp, int fhlen,
4168     u_int8_t *newfhp, int newfhlen, u_int32_t mode, struct nfsclopen *op,
4169     u_int8_t *name, int namelen, struct nfscldeleg **ndpp,
4170     int reclaim, u_int32_t delegtype, struct ucred *cred, NFSPROC_T *p)
4171 {
4172 	int error;
4173 
4174 	do {
4175 		error = nfsrpc_openrpc(nmp, vp, fhp, fhlen, newfhp, newfhlen,
4176 		    mode, op, name, namelen, ndpp, reclaim, delegtype, cred, p,
4177 		    0, 0);
4178 		if (error == NFSERR_DELAY)
4179 			(void) nfs_catnap(PZERO, error, "nfstryop");
4180 	} while (error == NFSERR_DELAY);
4181 	if (error == EAUTH || error == EACCES) {
4182 		/* Try again using system credentials */
4183 		newnfs_setroot(cred);
4184 		do {
4185 		    error = nfsrpc_openrpc(nmp, vp, fhp, fhlen, newfhp,
4186 			newfhlen, mode, op, name, namelen, ndpp, reclaim,
4187 			delegtype, cred, p, 1, 0);
4188 		    if (error == NFSERR_DELAY)
4189 			(void) nfs_catnap(PZERO, error, "nfstryop");
4190 		} while (error == NFSERR_DELAY);
4191 	}
4192 	return (error);
4193 }
4194 
4195 /*
4196  * Try a byte range lock. Just loop on nfsrpc_lock() while it returns
4197  * NFSERR_DELAY. Also, retry with system credentials, if the provided
4198  * cred don't work.
4199  */
4200 static int
4201 nfscl_trylock(struct nfsmount *nmp, vnode_t vp, u_int8_t *fhp,
4202     int fhlen, struct nfscllockowner *nlp, int newone, int reclaim,
4203     u_int64_t off, u_int64_t len, short type, struct ucred *cred, NFSPROC_T *p)
4204 {
4205 	struct nfsrv_descript nfsd, *nd = &nfsd;
4206 	int error;
4207 
4208 	do {
4209 		error = nfsrpc_lock(nd, nmp, vp, fhp, fhlen, nlp, newone,
4210 		    reclaim, off, len, type, cred, p, 0);
4211 		if (!error && nd->nd_repstat == NFSERR_DELAY)
4212 			(void) nfs_catnap(PZERO, (int)nd->nd_repstat,
4213 			    "nfstrylck");
4214 	} while (!error && nd->nd_repstat == NFSERR_DELAY);
4215 	if (!error)
4216 		error = nd->nd_repstat;
4217 	if (error == EAUTH || error == EACCES) {
4218 		/* Try again using root credentials */
4219 		newnfs_setroot(cred);
4220 		do {
4221 			error = nfsrpc_lock(nd, nmp, vp, fhp, fhlen, nlp,
4222 			    newone, reclaim, off, len, type, cred, p, 1);
4223 			if (!error && nd->nd_repstat == NFSERR_DELAY)
4224 				(void) nfs_catnap(PZERO, (int)nd->nd_repstat,
4225 				    "nfstrylck");
4226 		} while (!error && nd->nd_repstat == NFSERR_DELAY);
4227 		if (!error)
4228 			error = nd->nd_repstat;
4229 	}
4230 	return (error);
4231 }
4232 
4233 /*
4234  * Try a delegreturn against the server. Just call nfsrpc_delegreturn(),
4235  * retrying while NFSERR_DELAY. Also, try system credentials, if the passed in
4236  * credentials fail.
4237  */
4238 static int
4239 nfscl_trydelegreturn(struct nfscldeleg *dp, struct ucred *cred,
4240     struct nfsmount *nmp, NFSPROC_T *p)
4241 {
4242 	int error;
4243 
4244 	do {
4245 		error = nfsrpc_delegreturn(dp, cred, nmp, p, 0);
4246 		if (error == NFSERR_DELAY)
4247 			(void) nfs_catnap(PZERO, error, "nfstrydp");
4248 	} while (error == NFSERR_DELAY);
4249 	if (error == EAUTH || error == EACCES) {
4250 		/* Try again using system credentials */
4251 		newnfs_setroot(cred);
4252 		do {
4253 			error = nfsrpc_delegreturn(dp, cred, nmp, p, 1);
4254 			if (error == NFSERR_DELAY)
4255 				(void) nfs_catnap(PZERO, error, "nfstrydp");
4256 		} while (error == NFSERR_DELAY);
4257 	}
4258 	return (error);
4259 }
4260 
4261 /*
4262  * Try a close against the server. Just call nfsrpc_closerpc(),
4263  * retrying while NFSERR_DELAY. Also, try system credentials, if the passed in
4264  * credentials fail.
4265  */
4266 APPLESTATIC int
4267 nfscl_tryclose(struct nfsclopen *op, struct ucred *cred,
4268     struct nfsmount *nmp, NFSPROC_T *p)
4269 {
4270 	struct nfsrv_descript nfsd, *nd = &nfsd;
4271 	int error;
4272 
4273 	do {
4274 		error = nfsrpc_closerpc(nd, nmp, op, cred, p, 0);
4275 		if (error == NFSERR_DELAY)
4276 			(void) nfs_catnap(PZERO, error, "nfstrycl");
4277 	} while (error == NFSERR_DELAY);
4278 	if (error == EAUTH || error == EACCES) {
4279 		/* Try again using system credentials */
4280 		newnfs_setroot(cred);
4281 		do {
4282 			error = nfsrpc_closerpc(nd, nmp, op, cred, p, 1);
4283 			if (error == NFSERR_DELAY)
4284 				(void) nfs_catnap(PZERO, error, "nfstrycl");
4285 		} while (error == NFSERR_DELAY);
4286 	}
4287 	return (error);
4288 }
4289 
4290 /*
4291  * Decide if a delegation on a file permits close without flushing writes
4292  * to the server. This might be a big performance win in some environments.
4293  * (Not useful until the client does caching on local stable storage.)
4294  */
4295 APPLESTATIC int
4296 nfscl_mustflush(vnode_t vp)
4297 {
4298 	struct nfsclclient *clp;
4299 	struct nfscldeleg *dp;
4300 	struct nfsnode *np;
4301 	struct nfsmount *nmp;
4302 
4303 	np = VTONFS(vp);
4304 	nmp = VFSTONFS(vnode_mount(vp));
4305 	if (!NFSHASNFSV4(nmp))
4306 		return (1);
4307 	NFSLOCKCLSTATE();
4308 	clp = nfscl_findcl(nmp);
4309 	if (clp == NULL) {
4310 		NFSUNLOCKCLSTATE();
4311 		return (1);
4312 	}
4313 	dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
4314 	if (dp != NULL && (dp->nfsdl_flags &
4315 	    (NFSCLDL_WRITE | NFSCLDL_RECALL | NFSCLDL_DELEGRET)) ==
4316 	     NFSCLDL_WRITE &&
4317 	    (dp->nfsdl_sizelimit >= np->n_size ||
4318 	     !NFSHASSTRICT3530(nmp))) {
4319 		NFSUNLOCKCLSTATE();
4320 		return (0);
4321 	}
4322 	NFSUNLOCKCLSTATE();
4323 	return (1);
4324 }
4325 
4326 /*
4327  * See if a (write) delegation exists for this file.
4328  */
4329 APPLESTATIC int
4330 nfscl_nodeleg(vnode_t vp, int writedeleg)
4331 {
4332 	struct nfsclclient *clp;
4333 	struct nfscldeleg *dp;
4334 	struct nfsnode *np;
4335 	struct nfsmount *nmp;
4336 
4337 	np = VTONFS(vp);
4338 	nmp = VFSTONFS(vnode_mount(vp));
4339 	if (!NFSHASNFSV4(nmp))
4340 		return (1);
4341 	NFSLOCKCLSTATE();
4342 	clp = nfscl_findcl(nmp);
4343 	if (clp == NULL) {
4344 		NFSUNLOCKCLSTATE();
4345 		return (1);
4346 	}
4347 	dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
4348 	if (dp != NULL &&
4349 	    (dp->nfsdl_flags & (NFSCLDL_RECALL | NFSCLDL_DELEGRET)) == 0 &&
4350 	    (writedeleg == 0 || (dp->nfsdl_flags & NFSCLDL_WRITE) ==
4351 	     NFSCLDL_WRITE)) {
4352 		NFSUNLOCKCLSTATE();
4353 		return (0);
4354 	}
4355 	NFSUNLOCKCLSTATE();
4356 	return (1);
4357 }
4358 
4359 /*
4360  * Look for an associated delegation that should be DelegReturned.
4361  */
4362 APPLESTATIC int
4363 nfscl_removedeleg(vnode_t vp, NFSPROC_T *p, nfsv4stateid_t *stp)
4364 {
4365 	struct nfsclclient *clp;
4366 	struct nfscldeleg *dp;
4367 	struct nfsclowner *owp;
4368 	struct nfscllockowner *lp;
4369 	struct nfsmount *nmp;
4370 	struct ucred *cred;
4371 	struct nfsnode *np;
4372 	int igotlock = 0, triedrecall = 0, needsrecall, retcnt = 0, islept;
4373 
4374 	nmp = VFSTONFS(vnode_mount(vp));
4375 	np = VTONFS(vp);
4376 	NFSLOCKCLSTATE();
4377 	/*
4378 	 * Loop around waiting for:
4379 	 * - outstanding I/O operations on delegations to complete
4380 	 * - for a delegation on vp that has state, lock the client and
4381 	 *   do a recall
4382 	 * - return delegation with no state
4383 	 */
4384 	while (1) {
4385 		clp = nfscl_findcl(nmp);
4386 		if (clp == NULL) {
4387 			NFSUNLOCKCLSTATE();
4388 			return (retcnt);
4389 		}
4390 		dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
4391 		    np->n_fhp->nfh_len);
4392 		if (dp != NULL) {
4393 		    /*
4394 		     * Wait for outstanding I/O ops to be done.
4395 		     */
4396 		    if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
4397 			if (igotlock) {
4398 			    nfsv4_unlock(&clp->nfsc_lock, 0);
4399 			    igotlock = 0;
4400 			}
4401 			dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
4402 			(void) nfsmsleep(&dp->nfsdl_rwlock,
4403 			    NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
4404 			continue;
4405 		    }
4406 		    needsrecall = 0;
4407 		    LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
4408 			if (!LIST_EMPTY(&owp->nfsow_open)) {
4409 			    needsrecall = 1;
4410 			    break;
4411 			}
4412 		    }
4413 		    if (!needsrecall) {
4414 			LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
4415 			    if (!LIST_EMPTY(&lp->nfsl_lock)) {
4416 				needsrecall = 1;
4417 				break;
4418 			    }
4419 			}
4420 		    }
4421 		    if (needsrecall && !triedrecall) {
4422 			dp->nfsdl_flags |= NFSCLDL_DELEGRET;
4423 			islept = 0;
4424 			while (!igotlock) {
4425 			    igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
4426 				&islept, NFSCLSTATEMUTEXPTR, NULL);
4427 			    if (islept)
4428 				break;
4429 			}
4430 			if (islept)
4431 			    continue;
4432 			NFSUNLOCKCLSTATE();
4433 			cred = newnfs_getcred();
4434 			newnfs_copycred(&dp->nfsdl_cred, cred);
4435 			(void) nfscl_recalldeleg(clp, nmp, dp, vp, cred, p, 0);
4436 			NFSFREECRED(cred);
4437 			triedrecall = 1;
4438 			NFSLOCKCLSTATE();
4439 			nfsv4_unlock(&clp->nfsc_lock, 0);
4440 			igotlock = 0;
4441 			continue;
4442 		    }
4443 		    *stp = dp->nfsdl_stateid;
4444 		    retcnt = 1;
4445 		    nfscl_cleandeleg(dp);
4446 		    nfscl_freedeleg(&clp->nfsc_deleg, dp);
4447 		}
4448 		if (igotlock)
4449 		    nfsv4_unlock(&clp->nfsc_lock, 0);
4450 		NFSUNLOCKCLSTATE();
4451 		return (retcnt);
4452 	}
4453 }
4454 
4455 /*
4456  * Look for associated delegation(s) that should be DelegReturned.
4457  */
4458 APPLESTATIC int
4459 nfscl_renamedeleg(vnode_t fvp, nfsv4stateid_t *fstp, int *gotfdp, vnode_t tvp,
4460     nfsv4stateid_t *tstp, int *gottdp, NFSPROC_T *p)
4461 {
4462 	struct nfsclclient *clp;
4463 	struct nfscldeleg *dp;
4464 	struct nfsclowner *owp;
4465 	struct nfscllockowner *lp;
4466 	struct nfsmount *nmp;
4467 	struct ucred *cred;
4468 	struct nfsnode *np;
4469 	int igotlock = 0, triedrecall = 0, needsrecall, retcnt = 0, islept;
4470 
4471 	nmp = VFSTONFS(vnode_mount(fvp));
4472 	*gotfdp = 0;
4473 	*gottdp = 0;
4474 	NFSLOCKCLSTATE();
4475 	/*
4476 	 * Loop around waiting for:
4477 	 * - outstanding I/O operations on delegations to complete
4478 	 * - for a delegation on fvp that has state, lock the client and
4479 	 *   do a recall
4480 	 * - return delegation(s) with no state.
4481 	 */
4482 	while (1) {
4483 		clp = nfscl_findcl(nmp);
4484 		if (clp == NULL) {
4485 			NFSUNLOCKCLSTATE();
4486 			return (retcnt);
4487 		}
4488 		np = VTONFS(fvp);
4489 		dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
4490 		    np->n_fhp->nfh_len);
4491 		if (dp != NULL && *gotfdp == 0) {
4492 		    /*
4493 		     * Wait for outstanding I/O ops to be done.
4494 		     */
4495 		    if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
4496 			if (igotlock) {
4497 			    nfsv4_unlock(&clp->nfsc_lock, 0);
4498 			    igotlock = 0;
4499 			}
4500 			dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
4501 			(void) nfsmsleep(&dp->nfsdl_rwlock,
4502 			    NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
4503 			continue;
4504 		    }
4505 		    needsrecall = 0;
4506 		    LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
4507 			if (!LIST_EMPTY(&owp->nfsow_open)) {
4508 			    needsrecall = 1;
4509 			    break;
4510 			}
4511 		    }
4512 		    if (!needsrecall) {
4513 			LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
4514 			    if (!LIST_EMPTY(&lp->nfsl_lock)) {
4515 				needsrecall = 1;
4516 				break;
4517 			    }
4518 			}
4519 		    }
4520 		    if (needsrecall && !triedrecall) {
4521 			dp->nfsdl_flags |= NFSCLDL_DELEGRET;
4522 			islept = 0;
4523 			while (!igotlock) {
4524 			    igotlock = nfsv4_lock(&clp->nfsc_lock, 1,
4525 				&islept, NFSCLSTATEMUTEXPTR, NULL);
4526 			    if (islept)
4527 				break;
4528 			}
4529 			if (islept)
4530 			    continue;
4531 			NFSUNLOCKCLSTATE();
4532 			cred = newnfs_getcred();
4533 			newnfs_copycred(&dp->nfsdl_cred, cred);
4534 			(void) nfscl_recalldeleg(clp, nmp, dp, fvp, cred, p, 0);
4535 			NFSFREECRED(cred);
4536 			triedrecall = 1;
4537 			NFSLOCKCLSTATE();
4538 			nfsv4_unlock(&clp->nfsc_lock, 0);
4539 			igotlock = 0;
4540 			continue;
4541 		    }
4542 		    *fstp = dp->nfsdl_stateid;
4543 		    retcnt++;
4544 		    *gotfdp = 1;
4545 		    nfscl_cleandeleg(dp);
4546 		    nfscl_freedeleg(&clp->nfsc_deleg, dp);
4547 		}
4548 		if (igotlock) {
4549 		    nfsv4_unlock(&clp->nfsc_lock, 0);
4550 		    igotlock = 0;
4551 		}
4552 		if (tvp != NULL) {
4553 		    np = VTONFS(tvp);
4554 		    dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh,
4555 			np->n_fhp->nfh_len);
4556 		    if (dp != NULL && *gottdp == 0) {
4557 			/*
4558 			 * Wait for outstanding I/O ops to be done.
4559 			 */
4560 			if (dp->nfsdl_rwlock.nfslock_usecnt > 0) {
4561 			    dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED;
4562 			    (void) nfsmsleep(&dp->nfsdl_rwlock,
4563 				NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL);
4564 			    continue;
4565 			}
4566 			LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) {
4567 			    if (!LIST_EMPTY(&owp->nfsow_open)) {
4568 				NFSUNLOCKCLSTATE();
4569 				return (retcnt);
4570 			    }
4571 			}
4572 			LIST_FOREACH(lp, &dp->nfsdl_lock, nfsl_list) {
4573 			    if (!LIST_EMPTY(&lp->nfsl_lock)) {
4574 				NFSUNLOCKCLSTATE();
4575 				return (retcnt);
4576 			    }
4577 			}
4578 			*tstp = dp->nfsdl_stateid;
4579 			retcnt++;
4580 			*gottdp = 1;
4581 			nfscl_cleandeleg(dp);
4582 			nfscl_freedeleg(&clp->nfsc_deleg, dp);
4583 		    }
4584 		}
4585 		NFSUNLOCKCLSTATE();
4586 		return (retcnt);
4587 	}
4588 }
4589 
4590 /*
4591  * Get a reference on the clientid associated with the mount point.
4592  * Return 1 if success, 0 otherwise.
4593  */
4594 APPLESTATIC int
4595 nfscl_getref(struct nfsmount *nmp)
4596 {
4597 	struct nfsclclient *clp;
4598 
4599 	NFSLOCKCLSTATE();
4600 	clp = nfscl_findcl(nmp);
4601 	if (clp == NULL) {
4602 		NFSUNLOCKCLSTATE();
4603 		return (0);
4604 	}
4605 	nfsv4_getref(&clp->nfsc_lock, NULL, NFSCLSTATEMUTEXPTR, NULL);
4606 	NFSUNLOCKCLSTATE();
4607 	return (1);
4608 }
4609 
4610 /*
4611  * Release a reference on a clientid acquired with the above call.
4612  */
4613 APPLESTATIC void
4614 nfscl_relref(struct nfsmount *nmp)
4615 {
4616 	struct nfsclclient *clp;
4617 
4618 	NFSLOCKCLSTATE();
4619 	clp = nfscl_findcl(nmp);
4620 	if (clp == NULL) {
4621 		NFSUNLOCKCLSTATE();
4622 		return;
4623 	}
4624 	nfsv4_relref(&clp->nfsc_lock);
4625 	NFSUNLOCKCLSTATE();
4626 }
4627 
4628 /*
4629  * Save the size attribute in the delegation, since the nfsnode
4630  * is going away.
4631  */
4632 APPLESTATIC void
4633 nfscl_reclaimnode(vnode_t vp)
4634 {
4635 	struct nfsclclient *clp;
4636 	struct nfscldeleg *dp;
4637 	struct nfsnode *np = VTONFS(vp);
4638 	struct nfsmount *nmp;
4639 
4640 	nmp = VFSTONFS(vnode_mount(vp));
4641 	if (!NFSHASNFSV4(nmp))
4642 		return;
4643 	NFSLOCKCLSTATE();
4644 	clp = nfscl_findcl(nmp);
4645 	if (clp == NULL) {
4646 		NFSUNLOCKCLSTATE();
4647 		return;
4648 	}
4649 	dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
4650 	if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE))
4651 		dp->nfsdl_size = np->n_size;
4652 	NFSUNLOCKCLSTATE();
4653 }
4654 
4655 /*
4656  * Get the saved size attribute in the delegation, since it is a
4657  * newly allocated nfsnode.
4658  */
4659 APPLESTATIC void
4660 nfscl_newnode(vnode_t vp)
4661 {
4662 	struct nfsclclient *clp;
4663 	struct nfscldeleg *dp;
4664 	struct nfsnode *np = VTONFS(vp);
4665 	struct nfsmount *nmp;
4666 
4667 	nmp = VFSTONFS(vnode_mount(vp));
4668 	if (!NFSHASNFSV4(nmp))
4669 		return;
4670 	NFSLOCKCLSTATE();
4671 	clp = nfscl_findcl(nmp);
4672 	if (clp == NULL) {
4673 		NFSUNLOCKCLSTATE();
4674 		return;
4675 	}
4676 	dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
4677 	if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE))
4678 		np->n_size = dp->nfsdl_size;
4679 	NFSUNLOCKCLSTATE();
4680 }
4681 
4682 /*
4683  * If there is a valid write delegation for this file, set the modtime
4684  * to the local clock time.
4685  */
4686 APPLESTATIC void
4687 nfscl_delegmodtime(vnode_t vp)
4688 {
4689 	struct nfsclclient *clp;
4690 	struct nfscldeleg *dp;
4691 	struct nfsnode *np = VTONFS(vp);
4692 	struct nfsmount *nmp;
4693 
4694 	nmp = VFSTONFS(vnode_mount(vp));
4695 	if (!NFSHASNFSV4(nmp))
4696 		return;
4697 	NFSLOCKCLSTATE();
4698 	clp = nfscl_findcl(nmp);
4699 	if (clp == NULL) {
4700 		NFSUNLOCKCLSTATE();
4701 		return;
4702 	}
4703 	dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
4704 	if (dp != NULL && (dp->nfsdl_flags & NFSCLDL_WRITE)) {
4705 		nanotime(&dp->nfsdl_modtime);
4706 		dp->nfsdl_flags |= NFSCLDL_MODTIMESET;
4707 	}
4708 	NFSUNLOCKCLSTATE();
4709 }
4710 
4711 /*
4712  * If there is a valid write delegation for this file with a modtime set,
4713  * put that modtime in mtime.
4714  */
4715 APPLESTATIC void
4716 nfscl_deleggetmodtime(vnode_t vp, struct timespec *mtime)
4717 {
4718 	struct nfsclclient *clp;
4719 	struct nfscldeleg *dp;
4720 	struct nfsnode *np = VTONFS(vp);
4721 	struct nfsmount *nmp;
4722 
4723 	nmp = VFSTONFS(vnode_mount(vp));
4724 	if (!NFSHASNFSV4(nmp))
4725 		return;
4726 	NFSLOCKCLSTATE();
4727 	clp = nfscl_findcl(nmp);
4728 	if (clp == NULL) {
4729 		NFSUNLOCKCLSTATE();
4730 		return;
4731 	}
4732 	dp = nfscl_finddeleg(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
4733 	if (dp != NULL &&
4734 	    (dp->nfsdl_flags & (NFSCLDL_WRITE | NFSCLDL_MODTIMESET)) ==
4735 	    (NFSCLDL_WRITE | NFSCLDL_MODTIMESET))
4736 		*mtime = dp->nfsdl_modtime;
4737 	NFSUNLOCKCLSTATE();
4738 }
4739 
4740 static int
4741 nfscl_errmap(struct nfsrv_descript *nd, u_int32_t minorvers)
4742 {
4743 	short *defaulterrp, *errp;
4744 
4745 	if (!nd->nd_repstat)
4746 		return (0);
4747 	if (nd->nd_procnum == NFSPROC_NOOP)
4748 		return (txdr_unsigned(nd->nd_repstat & 0xffff));
4749 	if (nd->nd_repstat == EBADRPC)
4750 		return (txdr_unsigned(NFSERR_BADXDR));
4751 	if (nd->nd_repstat == NFSERR_MINORVERMISMATCH ||
4752 	    nd->nd_repstat == NFSERR_OPILLEGAL)
4753 		return (txdr_unsigned(nd->nd_repstat));
4754 	if (nd->nd_repstat >= NFSERR_BADIOMODE && nd->nd_repstat < 20000 &&
4755 	    minorvers > NFSV4_MINORVERSION) {
4756 		/* NFSv4.n error. */
4757 		return (txdr_unsigned(nd->nd_repstat));
4758 	}
4759 	if (nd->nd_procnum < NFSV4OP_CBNOPS)
4760 		errp = defaulterrp = nfscl_cberrmap[nd->nd_procnum];
4761 	else
4762 		return (txdr_unsigned(nd->nd_repstat));
4763 	while (*++errp)
4764 		if (*errp == (short)nd->nd_repstat)
4765 			return (txdr_unsigned(nd->nd_repstat));
4766 	return (txdr_unsigned(*defaulterrp));
4767 }
4768 
4769 /*
4770  * Called to find/add a layout to a client.
4771  * This function returns the layout with a refcnt (shared lock) upon
4772  * success (returns 0) or with no lock/refcnt on the layout when an
4773  * error is returned.
4774  * If a layout is passed in via lypp, it is locked (exclusively locked).
4775  */
4776 APPLESTATIC int
4777 nfscl_layout(struct nfsmount *nmp, vnode_t vp, u_int8_t *fhp, int fhlen,
4778     nfsv4stateid_t *stateidp, int retonclose,
4779     struct nfsclflayouthead *fhlp, struct nfscllayout **lypp,
4780     struct ucred *cred, NFSPROC_T *p)
4781 {
4782 	struct nfsclclient *clp;
4783 	struct nfscllayout *lyp, *tlyp;
4784 	struct nfsclflayout *flp;
4785 	struct nfsnode *np = VTONFS(vp);
4786 	mount_t mp;
4787 	int layout_passed_in;
4788 
4789 	mp = nmp->nm_mountp;
4790 	layout_passed_in = 1;
4791 	tlyp = NULL;
4792 	lyp = *lypp;
4793 	if (lyp == NULL) {
4794 		layout_passed_in = 0;
4795 		tlyp = malloc(sizeof(*tlyp) + fhlen - 1, M_NFSLAYOUT,
4796 		    M_WAITOK | M_ZERO);
4797 	}
4798 
4799 	NFSLOCKCLSTATE();
4800 	clp = nmp->nm_clp;
4801 	if (clp == NULL) {
4802 		if (layout_passed_in != 0)
4803 			nfsv4_unlock(&lyp->nfsly_lock, 0);
4804 		NFSUNLOCKCLSTATE();
4805 		if (tlyp != NULL)
4806 			free(tlyp, M_NFSLAYOUT);
4807 		return (EPERM);
4808 	}
4809 	if (lyp == NULL) {
4810 		/*
4811 		 * Although no lyp was passed in, another thread might have
4812 		 * allocated one. If one is found, just increment it's ref
4813 		 * count and return it.
4814 		 */
4815 		lyp = nfscl_findlayout(clp, fhp, fhlen);
4816 		if (lyp == NULL) {
4817 			lyp = tlyp;
4818 			tlyp = NULL;
4819 			lyp->nfsly_stateid.seqid = stateidp->seqid;
4820 			lyp->nfsly_stateid.other[0] = stateidp->other[0];
4821 			lyp->nfsly_stateid.other[1] = stateidp->other[1];
4822 			lyp->nfsly_stateid.other[2] = stateidp->other[2];
4823 			lyp->nfsly_lastbyte = 0;
4824 			LIST_INIT(&lyp->nfsly_flayread);
4825 			LIST_INIT(&lyp->nfsly_flayrw);
4826 			LIST_INIT(&lyp->nfsly_recall);
4827 			lyp->nfsly_filesid[0] = np->n_vattr.na_filesid[0];
4828 			lyp->nfsly_filesid[1] = np->n_vattr.na_filesid[1];
4829 			lyp->nfsly_clp = clp;
4830 			lyp->nfsly_flags = (retonclose != 0) ?
4831 			    (NFSLY_FILES | NFSLY_RETONCLOSE) : NFSLY_FILES;
4832 			lyp->nfsly_fhlen = fhlen;
4833 			NFSBCOPY(fhp, lyp->nfsly_fh, fhlen);
4834 			TAILQ_INSERT_HEAD(&clp->nfsc_layout, lyp, nfsly_list);
4835 			LIST_INSERT_HEAD(NFSCLLAYOUTHASH(clp, fhp, fhlen), lyp,
4836 			    nfsly_hash);
4837 			lyp->nfsly_timestamp = NFSD_MONOSEC + 120;
4838 			nfscl_layoutcnt++;
4839 		} else {
4840 			if (retonclose != 0)
4841 				lyp->nfsly_flags |= NFSLY_RETONCLOSE;
4842 			TAILQ_REMOVE(&clp->nfsc_layout, lyp, nfsly_list);
4843 			TAILQ_INSERT_HEAD(&clp->nfsc_layout, lyp, nfsly_list);
4844 			lyp->nfsly_timestamp = NFSD_MONOSEC + 120;
4845 		}
4846 		nfsv4_getref(&lyp->nfsly_lock, NULL, NFSCLSTATEMUTEXPTR, mp);
4847 		if (NFSCL_FORCEDISM(mp)) {
4848 			NFSUNLOCKCLSTATE();
4849 			if (tlyp != NULL)
4850 				free(tlyp, M_NFSLAYOUT);
4851 			return (EPERM);
4852 		}
4853 		*lypp = lyp;
4854 	} else
4855 		lyp->nfsly_stateid.seqid = stateidp->seqid;
4856 
4857 	/* Merge the new list of File Layouts into the list. */
4858 	flp = LIST_FIRST(fhlp);
4859 	if (flp != NULL) {
4860 		if (flp->nfsfl_iomode == NFSLAYOUTIOMODE_READ)
4861 			nfscl_mergeflayouts(&lyp->nfsly_flayread, fhlp);
4862 		else
4863 			nfscl_mergeflayouts(&lyp->nfsly_flayrw, fhlp);
4864 	}
4865 	if (layout_passed_in != 0)
4866 		nfsv4_unlock(&lyp->nfsly_lock, 1);
4867 	NFSUNLOCKCLSTATE();
4868 	if (tlyp != NULL)
4869 		free(tlyp, M_NFSLAYOUT);
4870 	return (0);
4871 }
4872 
4873 /*
4874  * Search for a layout by MDS file handle.
4875  * If one is found, it is returned with a refcnt (shared lock) iff
4876  * retflpp returned non-NULL and locked (exclusive locked) iff retflpp is
4877  * returned NULL.
4878  */
4879 struct nfscllayout *
4880 nfscl_getlayout(struct nfsclclient *clp, uint8_t *fhp, int fhlen,
4881     uint64_t off, struct nfsclflayout **retflpp, int *recalledp)
4882 {
4883 	struct nfscllayout *lyp;
4884 	mount_t mp;
4885 	int error, igotlock;
4886 
4887 	mp = clp->nfsc_nmp->nm_mountp;
4888 	*recalledp = 0;
4889 	*retflpp = NULL;
4890 	NFSLOCKCLSTATE();
4891 	lyp = nfscl_findlayout(clp, fhp, fhlen);
4892 	if (lyp != NULL) {
4893 		if ((lyp->nfsly_flags & NFSLY_RECALL) == 0) {
4894 			TAILQ_REMOVE(&clp->nfsc_layout, lyp, nfsly_list);
4895 			TAILQ_INSERT_HEAD(&clp->nfsc_layout, lyp, nfsly_list);
4896 			lyp->nfsly_timestamp = NFSD_MONOSEC + 120;
4897 			error = nfscl_findlayoutforio(lyp, off,
4898 			    NFSV4OPEN_ACCESSREAD, retflpp);
4899 			if (error == 0)
4900 				nfsv4_getref(&lyp->nfsly_lock, NULL,
4901 				    NFSCLSTATEMUTEXPTR, mp);
4902 			else {
4903 				do {
4904 					igotlock = nfsv4_lock(&lyp->nfsly_lock,
4905 					    1, NULL, NFSCLSTATEMUTEXPTR, mp);
4906 				} while (igotlock == 0 && !NFSCL_FORCEDISM(mp));
4907 				*retflpp = NULL;
4908 			}
4909 			if (NFSCL_FORCEDISM(mp)) {
4910 				lyp = NULL;
4911 				*recalledp = 1;
4912 			}
4913 		} else {
4914 			lyp = NULL;
4915 			*recalledp = 1;
4916 		}
4917 	}
4918 	NFSUNLOCKCLSTATE();
4919 	return (lyp);
4920 }
4921 
4922 /*
4923  * Search for a layout by MDS file handle. If one is found, mark in to be
4924  * recalled, if it already marked "return on close".
4925  */
4926 static void
4927 nfscl_retoncloselayout(vnode_t vp, struct nfsclclient *clp, uint8_t *fhp,
4928     int fhlen, struct nfsclrecalllayout **recallpp)
4929 {
4930 	struct nfscllayout *lyp;
4931 	uint32_t iomode;
4932 
4933 	if (vp->v_type != VREG || !NFSHASPNFS(VFSTONFS(vnode_mount(vp))) ||
4934 	    nfscl_enablecallb == 0 || nfs_numnfscbd == 0 ||
4935 	    (VTONFS(vp)->n_flag & NNOLAYOUT) != 0)
4936 		return;
4937 	lyp = nfscl_findlayout(clp, fhp, fhlen);
4938 	if (lyp != NULL && (lyp->nfsly_flags & (NFSLY_RETONCLOSE |
4939 	    NFSLY_RECALL)) == NFSLY_RETONCLOSE) {
4940 		iomode = 0;
4941 		if (!LIST_EMPTY(&lyp->nfsly_flayread))
4942 			iomode |= NFSLAYOUTIOMODE_READ;
4943 		if (!LIST_EMPTY(&lyp->nfsly_flayrw))
4944 			iomode |= NFSLAYOUTIOMODE_RW;
4945 		(void)nfscl_layoutrecall(NFSLAYOUTRETURN_FILE, lyp, iomode,
4946 		    0, UINT64_MAX, lyp->nfsly_stateid.seqid, *recallpp);
4947 		NFSCL_DEBUG(4, "retoncls recall iomode=%d\n", iomode);
4948 		*recallpp = NULL;
4949 	}
4950 }
4951 
4952 /*
4953  * Dereference a layout.
4954  */
4955 void
4956 nfscl_rellayout(struct nfscllayout *lyp, int exclocked)
4957 {
4958 
4959 	NFSLOCKCLSTATE();
4960 	if (exclocked != 0)
4961 		nfsv4_unlock(&lyp->nfsly_lock, 0);
4962 	else
4963 		nfsv4_relref(&lyp->nfsly_lock);
4964 	NFSUNLOCKCLSTATE();
4965 }
4966 
4967 /*
4968  * Search for a devinfo by deviceid. If one is found, return it after
4969  * acquiring a reference count on it.
4970  */
4971 struct nfscldevinfo *
4972 nfscl_getdevinfo(struct nfsclclient *clp, uint8_t *deviceid,
4973     struct nfscldevinfo *dip)
4974 {
4975 
4976 	NFSLOCKCLSTATE();
4977 	if (dip == NULL)
4978 		dip = nfscl_finddevinfo(clp, deviceid);
4979 	if (dip != NULL)
4980 		dip->nfsdi_refcnt++;
4981 	NFSUNLOCKCLSTATE();
4982 	return (dip);
4983 }
4984 
4985 /*
4986  * Dereference a devinfo structure.
4987  */
4988 static void
4989 nfscl_reldevinfo_locked(struct nfscldevinfo *dip)
4990 {
4991 
4992 	dip->nfsdi_refcnt--;
4993 	if (dip->nfsdi_refcnt == 0)
4994 		wakeup(&dip->nfsdi_refcnt);
4995 }
4996 
4997 /*
4998  * Dereference a devinfo structure.
4999  */
5000 void
5001 nfscl_reldevinfo(struct nfscldevinfo *dip)
5002 {
5003 
5004 	NFSLOCKCLSTATE();
5005 	nfscl_reldevinfo_locked(dip);
5006 	NFSUNLOCKCLSTATE();
5007 }
5008 
5009 /*
5010  * Find a layout for this file handle. Return NULL upon failure.
5011  */
5012 static struct nfscllayout *
5013 nfscl_findlayout(struct nfsclclient *clp, u_int8_t *fhp, int fhlen)
5014 {
5015 	struct nfscllayout *lyp;
5016 
5017 	LIST_FOREACH(lyp, NFSCLLAYOUTHASH(clp, fhp, fhlen), nfsly_hash)
5018 		if (lyp->nfsly_fhlen == fhlen &&
5019 		    !NFSBCMP(lyp->nfsly_fh, fhp, fhlen))
5020 			break;
5021 	return (lyp);
5022 }
5023 
5024 /*
5025  * Find a devinfo for this deviceid. Return NULL upon failure.
5026  */
5027 static struct nfscldevinfo *
5028 nfscl_finddevinfo(struct nfsclclient *clp, uint8_t *deviceid)
5029 {
5030 	struct nfscldevinfo *dip;
5031 
5032 	LIST_FOREACH(dip, &clp->nfsc_devinfo, nfsdi_list)
5033 		if (NFSBCMP(dip->nfsdi_deviceid, deviceid, NFSX_V4DEVICEID)
5034 		    == 0)
5035 			break;
5036 	return (dip);
5037 }
5038 
5039 /*
5040  * Merge the new file layout list into the main one, maintaining it in
5041  * increasing offset order.
5042  */
5043 static void
5044 nfscl_mergeflayouts(struct nfsclflayouthead *fhlp,
5045     struct nfsclflayouthead *newfhlp)
5046 {
5047 	struct nfsclflayout *flp, *nflp, *prevflp, *tflp;
5048 
5049 	flp = LIST_FIRST(fhlp);
5050 	prevflp = NULL;
5051 	LIST_FOREACH_SAFE(nflp, newfhlp, nfsfl_list, tflp) {
5052 		while (flp != NULL && flp->nfsfl_off < nflp->nfsfl_off) {
5053 			prevflp = flp;
5054 			flp = LIST_NEXT(flp, nfsfl_list);
5055 		}
5056 		if (prevflp == NULL)
5057 			LIST_INSERT_HEAD(fhlp, nflp, nfsfl_list);
5058 		else
5059 			LIST_INSERT_AFTER(prevflp, nflp, nfsfl_list);
5060 		prevflp = nflp;
5061 	}
5062 }
5063 
5064 /*
5065  * Add this nfscldevinfo to the client, if it doesn't already exist.
5066  * This function consumes the structure pointed at by dip, if not NULL.
5067  */
5068 APPLESTATIC int
5069 nfscl_adddevinfo(struct nfsmount *nmp, struct nfscldevinfo *dip,
5070     struct nfsclflayout *flp)
5071 {
5072 	struct nfsclclient *clp;
5073 	struct nfscldevinfo *tdip;
5074 
5075 	NFSLOCKCLSTATE();
5076 	clp = nmp->nm_clp;
5077 	if (clp == NULL) {
5078 		NFSUNLOCKCLSTATE();
5079 		if (dip != NULL)
5080 			free(dip, M_NFSDEVINFO);
5081 		return (ENODEV);
5082 	}
5083 	tdip = nfscl_finddevinfo(clp, flp->nfsfl_dev);
5084 	if (tdip != NULL) {
5085 		tdip->nfsdi_layoutrefs++;
5086 		flp->nfsfl_devp = tdip;
5087 		nfscl_reldevinfo_locked(tdip);
5088 		NFSUNLOCKCLSTATE();
5089 		if (dip != NULL)
5090 			free(dip, M_NFSDEVINFO);
5091 		return (0);
5092 	}
5093 	if (dip != NULL) {
5094 		LIST_INSERT_HEAD(&clp->nfsc_devinfo, dip, nfsdi_list);
5095 		dip->nfsdi_layoutrefs = 1;
5096 		flp->nfsfl_devp = dip;
5097 	}
5098 	NFSUNLOCKCLSTATE();
5099 	if (dip == NULL)
5100 		return (ENODEV);
5101 	return (0);
5102 }
5103 
5104 /*
5105  * Free up a layout structure and associated file layout structure(s).
5106  */
5107 APPLESTATIC void
5108 nfscl_freelayout(struct nfscllayout *layp)
5109 {
5110 	struct nfsclflayout *flp, *nflp;
5111 	struct nfsclrecalllayout *rp, *nrp;
5112 
5113 	LIST_FOREACH_SAFE(flp, &layp->nfsly_flayread, nfsfl_list, nflp) {
5114 		LIST_REMOVE(flp, nfsfl_list);
5115 		nfscl_freeflayout(flp);
5116 	}
5117 	LIST_FOREACH_SAFE(flp, &layp->nfsly_flayrw, nfsfl_list, nflp) {
5118 		LIST_REMOVE(flp, nfsfl_list);
5119 		nfscl_freeflayout(flp);
5120 	}
5121 	LIST_FOREACH_SAFE(rp, &layp->nfsly_recall, nfsrecly_list, nrp) {
5122 		LIST_REMOVE(rp, nfsrecly_list);
5123 		free(rp, M_NFSLAYRECALL);
5124 	}
5125 	nfscl_layoutcnt--;
5126 	free(layp, M_NFSLAYOUT);
5127 }
5128 
5129 /*
5130  * Free up a file layout structure.
5131  */
5132 APPLESTATIC void
5133 nfscl_freeflayout(struct nfsclflayout *flp)
5134 {
5135 	int i;
5136 
5137 	for (i = 0; i < flp->nfsfl_fhcnt; i++)
5138 		free(flp->nfsfl_fh[i], M_NFSFH);
5139 	if (flp->nfsfl_devp != NULL)
5140 		flp->nfsfl_devp->nfsdi_layoutrefs--;
5141 	free(flp, M_NFSFLAYOUT);
5142 }
5143 
5144 /*
5145  * Free up a file layout devinfo structure.
5146  */
5147 APPLESTATIC void
5148 nfscl_freedevinfo(struct nfscldevinfo *dip)
5149 {
5150 
5151 	free(dip, M_NFSDEVINFO);
5152 }
5153 
5154 /*
5155  * Mark any layouts that match as recalled.
5156  */
5157 static int
5158 nfscl_layoutrecall(int recalltype, struct nfscllayout *lyp, uint32_t iomode,
5159     uint64_t off, uint64_t len, uint32_t stateseqid,
5160     struct nfsclrecalllayout *recallp)
5161 {
5162 	struct nfsclrecalllayout *rp, *orp;
5163 
5164 	recallp->nfsrecly_recalltype = recalltype;
5165 	recallp->nfsrecly_iomode = iomode;
5166 	recallp->nfsrecly_stateseqid = stateseqid;
5167 	recallp->nfsrecly_off = off;
5168 	recallp->nfsrecly_len = len;
5169 	/*
5170 	 * Order the list as file returns first, followed by fsid and any
5171 	 * returns, both in increasing stateseqid order.
5172 	 * Note that the seqids wrap around, so 1 is after 0xffffffff.
5173 	 * (I'm not sure this is correct because I find RFC5661 confusing
5174 	 *  on this, but hopefully it will work ok.)
5175 	 */
5176 	orp = NULL;
5177 	LIST_FOREACH(rp, &lyp->nfsly_recall, nfsrecly_list) {
5178 		orp = rp;
5179 		if ((recalltype == NFSLAYOUTRETURN_FILE &&
5180 		     (rp->nfsrecly_recalltype != NFSLAYOUTRETURN_FILE ||
5181 		      nfscl_seq(stateseqid, rp->nfsrecly_stateseqid) != 0)) ||
5182 		    (recalltype != NFSLAYOUTRETURN_FILE &&
5183 		     rp->nfsrecly_recalltype != NFSLAYOUTRETURN_FILE &&
5184 		     nfscl_seq(stateseqid, rp->nfsrecly_stateseqid) != 0)) {
5185 			LIST_INSERT_BEFORE(rp, recallp, nfsrecly_list);
5186 			break;
5187 		}
5188 	}
5189 	if (rp == NULL) {
5190 		if (orp == NULL)
5191 			LIST_INSERT_HEAD(&lyp->nfsly_recall, recallp,
5192 			    nfsrecly_list);
5193 		else
5194 			LIST_INSERT_AFTER(orp, recallp, nfsrecly_list);
5195 	}
5196 	lyp->nfsly_flags |= NFSLY_RECALL;
5197 	return (0);
5198 }
5199 
5200 /*
5201  * Compare the two seqids for ordering. The trick is that the seqids can
5202  * wrap around from 0xffffffff->0, so check for the cases where one
5203  * has wrapped around.
5204  * Return 1 if seqid1 comes before seqid2, 0 otherwise.
5205  */
5206 static int
5207 nfscl_seq(uint32_t seqid1, uint32_t seqid2)
5208 {
5209 
5210 	if (seqid2 > seqid1 && (seqid2 - seqid1) >= 0x7fffffff)
5211 		/* seqid2 has wrapped around. */
5212 		return (0);
5213 	if (seqid1 > seqid2 && (seqid1 - seqid2) >= 0x7fffffff)
5214 		/* seqid1 has wrapped around. */
5215 		return (1);
5216 	if (seqid1 <= seqid2)
5217 		return (1);
5218 	return (0);
5219 }
5220 
5221 /*
5222  * Do a layout return for each of the recalls.
5223  */
5224 static void
5225 nfscl_layoutreturn(struct nfsmount *nmp, struct nfscllayout *lyp,
5226     struct ucred *cred, NFSPROC_T *p)
5227 {
5228 	struct nfsclrecalllayout *rp;
5229 	nfsv4stateid_t stateid;
5230 
5231 	NFSBCOPY(lyp->nfsly_stateid.other, stateid.other, NFSX_STATEIDOTHER);
5232 	stateid.seqid = lyp->nfsly_stateid.seqid;
5233 	LIST_FOREACH(rp, &lyp->nfsly_recall, nfsrecly_list) {
5234 		(void)nfsrpc_layoutreturn(nmp, lyp->nfsly_fh,
5235 		    lyp->nfsly_fhlen, 0, NFSLAYOUT_NFSV4_1_FILES,
5236 		    rp->nfsrecly_iomode, rp->nfsrecly_recalltype,
5237 		    rp->nfsrecly_off, rp->nfsrecly_len,
5238 		    &stateid, 0, NULL, cred, p, NULL);
5239 	}
5240 }
5241 
5242 /*
5243  * Do the layout commit for a file layout.
5244  */
5245 static void
5246 nfscl_dolayoutcommit(struct nfsmount *nmp, struct nfscllayout *lyp,
5247     struct ucred *cred, NFSPROC_T *p)
5248 {
5249 	struct nfsclflayout *flp;
5250 	uint64_t len;
5251 	int error;
5252 
5253 	LIST_FOREACH(flp, &lyp->nfsly_flayrw, nfsfl_list) {
5254 		if (flp->nfsfl_off <= lyp->nfsly_lastbyte) {
5255 			len = flp->nfsfl_end - flp->nfsfl_off;
5256 			error = nfsrpc_layoutcommit(nmp, lyp->nfsly_fh,
5257 			    lyp->nfsly_fhlen, 0, flp->nfsfl_off, len,
5258 			    lyp->nfsly_lastbyte, &lyp->nfsly_stateid,
5259 			    NFSLAYOUT_NFSV4_1_FILES, 0, NULL, cred, p, NULL);
5260 			NFSCL_DEBUG(4, "layoutcommit err=%d\n", error);
5261 			if (error == NFSERR_NOTSUPP) {
5262 				/* If not supported, don't bother doing it. */
5263 				NFSLOCKMNT(nmp);
5264 				nmp->nm_state |= NFSSTA_NOLAYOUTCOMMIT;
5265 				NFSUNLOCKMNT(nmp);
5266 				break;
5267 			}
5268 		}
5269 	}
5270 }
5271 
5272 /*
5273  * Commit all layouts for a file (vnode).
5274  */
5275 int
5276 nfscl_layoutcommit(vnode_t vp, NFSPROC_T *p)
5277 {
5278 	struct nfsclclient *clp;
5279 	struct nfscllayout *lyp;
5280 	struct nfsnode *np = VTONFS(vp);
5281 	mount_t mp;
5282 	struct nfsmount *nmp;
5283 
5284 	mp = vnode_mount(vp);
5285 	nmp = VFSTONFS(mp);
5286 	if (NFSHASNOLAYOUTCOMMIT(nmp))
5287 		return (0);
5288 	NFSLOCKCLSTATE();
5289 	clp = nmp->nm_clp;
5290 	if (clp == NULL) {
5291 		NFSUNLOCKCLSTATE();
5292 		return (EPERM);
5293 	}
5294 	lyp = nfscl_findlayout(clp, np->n_fhp->nfh_fh, np->n_fhp->nfh_len);
5295 	if (lyp == NULL) {
5296 		NFSUNLOCKCLSTATE();
5297 		return (EPERM);
5298 	}
5299 	nfsv4_getref(&lyp->nfsly_lock, NULL, NFSCLSTATEMUTEXPTR, mp);
5300 	if (NFSCL_FORCEDISM(mp)) {
5301 		NFSUNLOCKCLSTATE();
5302 		return (EPERM);
5303 	}
5304 tryagain:
5305 	if ((lyp->nfsly_flags & NFSLY_WRITTEN) != 0) {
5306 		lyp->nfsly_flags &= ~NFSLY_WRITTEN;
5307 		NFSUNLOCKCLSTATE();
5308 		NFSCL_DEBUG(4, "do layoutcommit2\n");
5309 		nfscl_dolayoutcommit(clp->nfsc_nmp, lyp, NFSPROCCRED(p), p);
5310 		NFSLOCKCLSTATE();
5311 		goto tryagain;
5312 	}
5313 	nfsv4_relref(&lyp->nfsly_lock);
5314 	NFSUNLOCKCLSTATE();
5315 	return (0);
5316 }
5317 
5318