xref: /freebsd/sys/fs/nfsclient/nfs_clvnops.c (revision 53e1cbefe4b81e6ecdad529fcd252600f838cf69)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1989, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * This code is derived from software contributed to Berkeley by
8  * Rick Macklem at The University of Guelph.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. Neither the name of the University nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  *
34  *	from nfs_vnops.c	8.16 (Berkeley) 5/27/95
35  */
36 
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
39 
40 /*
41  * vnode op calls for Sun NFS version 2, 3 and 4
42  */
43 
44 #include "opt_inet.h"
45 
46 #include <sys/param.h>
47 #include <sys/kernel.h>
48 #include <sys/systm.h>
49 #include <sys/resourcevar.h>
50 #include <sys/proc.h>
51 #include <sys/mount.h>
52 #include <sys/bio.h>
53 #include <sys/buf.h>
54 #include <sys/extattr.h>
55 #include <sys/filio.h>
56 #include <sys/jail.h>
57 #include <sys/malloc.h>
58 #include <sys/mbuf.h>
59 #include <sys/namei.h>
60 #include <sys/socket.h>
61 #include <sys/vnode.h>
62 #include <sys/dirent.h>
63 #include <sys/fcntl.h>
64 #include <sys/lockf.h>
65 #include <sys/stat.h>
66 #include <sys/sysctl.h>
67 #include <sys/signalvar.h>
68 
69 #include <vm/vm.h>
70 #include <vm/vm_extern.h>
71 #include <vm/vm_object.h>
72 
73 #include <fs/nfs/nfsport.h>
74 #include <fs/nfsclient/nfsnode.h>
75 #include <fs/nfsclient/nfsmount.h>
76 #include <fs/nfsclient/nfs.h>
77 #include <fs/nfsclient/nfs_kdtrace.h>
78 
79 #include <net/if.h>
80 #include <netinet/in.h>
81 #include <netinet/in_var.h>
82 
83 #include <nfs/nfs_lock.h>
84 
85 #ifdef KDTRACE_HOOKS
86 #include <sys/dtrace_bsd.h>
87 
88 dtrace_nfsclient_accesscache_flush_probe_func_t
89 		dtrace_nfscl_accesscache_flush_done_probe;
90 uint32_t	nfscl_accesscache_flush_done_id;
91 
92 dtrace_nfsclient_accesscache_get_probe_func_t
93 		dtrace_nfscl_accesscache_get_hit_probe,
94 		dtrace_nfscl_accesscache_get_miss_probe;
95 uint32_t	nfscl_accesscache_get_hit_id;
96 uint32_t	nfscl_accesscache_get_miss_id;
97 
98 dtrace_nfsclient_accesscache_load_probe_func_t
99 		dtrace_nfscl_accesscache_load_done_probe;
100 uint32_t	nfscl_accesscache_load_done_id;
101 #endif /* !KDTRACE_HOOKS */
102 
103 /* Defs */
104 #define	TRUE	1
105 #define	FALSE	0
106 
107 extern struct nfsstatsv1 nfsstatsv1;
108 extern int nfsrv_useacl;
109 extern int nfscl_debuglevel;
110 MALLOC_DECLARE(M_NEWNFSREQ);
111 
112 static vop_read_t	nfsfifo_read;
113 static vop_write_t	nfsfifo_write;
114 static vop_close_t	nfsfifo_close;
115 static int	nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
116 		    struct thread *);
117 static vop_lookup_t	nfs_lookup;
118 static vop_create_t	nfs_create;
119 static vop_mknod_t	nfs_mknod;
120 static vop_open_t	nfs_open;
121 static vop_pathconf_t	nfs_pathconf;
122 static vop_close_t	nfs_close;
123 static vop_access_t	nfs_access;
124 static vop_getattr_t	nfs_getattr;
125 static vop_setattr_t	nfs_setattr;
126 static vop_read_t	nfs_read;
127 static vop_fsync_t	nfs_fsync;
128 static vop_remove_t	nfs_remove;
129 static vop_link_t	nfs_link;
130 static vop_rename_t	nfs_rename;
131 static vop_mkdir_t	nfs_mkdir;
132 static vop_rmdir_t	nfs_rmdir;
133 static vop_symlink_t	nfs_symlink;
134 static vop_readdir_t	nfs_readdir;
135 static vop_strategy_t	nfs_strategy;
136 static	int	nfs_lookitup(struct vnode *, char *, int,
137 		    struct ucred *, struct thread *, struct nfsnode **);
138 static	int	nfs_sillyrename(struct vnode *, struct vnode *,
139 		    struct componentname *);
140 static vop_access_t	nfsspec_access;
141 static vop_readlink_t	nfs_readlink;
142 static vop_print_t	nfs_print;
143 static vop_advlock_t	nfs_advlock;
144 static vop_advlockasync_t nfs_advlockasync;
145 static vop_getacl_t nfs_getacl;
146 static vop_setacl_t nfs_setacl;
147 static vop_advise_t nfs_advise;
148 static vop_allocate_t nfs_allocate;
149 static vop_deallocate_t nfs_deallocate;
150 static vop_copy_file_range_t nfs_copy_file_range;
151 static vop_ioctl_t nfs_ioctl;
152 static vop_getextattr_t nfs_getextattr;
153 static vop_setextattr_t nfs_setextattr;
154 static vop_listextattr_t nfs_listextattr;
155 static vop_deleteextattr_t nfs_deleteextattr;
156 static vop_lock1_t	nfs_lock;
157 
158 /*
159  * Global vfs data structures for nfs
160  */
161 
162 static struct vop_vector newnfs_vnodeops_nosig = {
163 	.vop_default =		&default_vnodeops,
164 	.vop_access =		nfs_access,
165 	.vop_advlock =		nfs_advlock,
166 	.vop_advlockasync =	nfs_advlockasync,
167 	.vop_close =		nfs_close,
168 	.vop_create =		nfs_create,
169 	.vop_fsync =		nfs_fsync,
170 	.vop_getattr =		nfs_getattr,
171 	.vop_getpages =		ncl_getpages,
172 	.vop_putpages =		ncl_putpages,
173 	.vop_inactive =		ncl_inactive,
174 	.vop_link =		nfs_link,
175 	.vop_lock1 =		nfs_lock,
176 	.vop_lookup =		nfs_lookup,
177 	.vop_mkdir =		nfs_mkdir,
178 	.vop_mknod =		nfs_mknod,
179 	.vop_open =		nfs_open,
180 	.vop_pathconf =		nfs_pathconf,
181 	.vop_print =		nfs_print,
182 	.vop_read =		nfs_read,
183 	.vop_readdir =		nfs_readdir,
184 	.vop_readlink =		nfs_readlink,
185 	.vop_reclaim =		ncl_reclaim,
186 	.vop_remove =		nfs_remove,
187 	.vop_rename =		nfs_rename,
188 	.vop_rmdir =		nfs_rmdir,
189 	.vop_setattr =		nfs_setattr,
190 	.vop_strategy =		nfs_strategy,
191 	.vop_symlink =		nfs_symlink,
192 	.vop_write =		ncl_write,
193 	.vop_getacl =		nfs_getacl,
194 	.vop_setacl =		nfs_setacl,
195 	.vop_advise =		nfs_advise,
196 	.vop_allocate =		nfs_allocate,
197 	.vop_deallocate =	nfs_deallocate,
198 	.vop_copy_file_range =	nfs_copy_file_range,
199 	.vop_ioctl =		nfs_ioctl,
200 	.vop_getextattr =	nfs_getextattr,
201 	.vop_setextattr =	nfs_setextattr,
202 	.vop_listextattr =	nfs_listextattr,
203 	.vop_deleteextattr =	nfs_deleteextattr,
204 };
205 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops_nosig);
206 
207 static int
208 nfs_vnodeops_bypass(struct vop_generic_args *a)
209 {
210 
211 	return (vop_sigdefer(&newnfs_vnodeops_nosig, a));
212 }
213 
214 struct vop_vector newnfs_vnodeops = {
215 	.vop_default =		&default_vnodeops,
216 	.vop_bypass =		nfs_vnodeops_bypass,
217 };
218 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops);
219 
220 static struct vop_vector newnfs_fifoops_nosig = {
221 	.vop_default =		&fifo_specops,
222 	.vop_access =		nfsspec_access,
223 	.vop_close =		nfsfifo_close,
224 	.vop_fsync =		nfs_fsync,
225 	.vop_getattr =		nfs_getattr,
226 	.vop_inactive =		ncl_inactive,
227 	.vop_pathconf =		nfs_pathconf,
228 	.vop_print =		nfs_print,
229 	.vop_read =		nfsfifo_read,
230 	.vop_reclaim =		ncl_reclaim,
231 	.vop_setattr =		nfs_setattr,
232 	.vop_write =		nfsfifo_write,
233 };
234 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops_nosig);
235 
236 static int
237 nfs_fifoops_bypass(struct vop_generic_args *a)
238 {
239 
240 	return (vop_sigdefer(&newnfs_fifoops_nosig, a));
241 }
242 
243 struct vop_vector newnfs_fifoops = {
244 	.vop_default =		&default_vnodeops,
245 	.vop_bypass =		nfs_fifoops_bypass,
246 };
247 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops);
248 
249 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
250     struct componentname *cnp, struct vattr *vap);
251 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
252     int namelen, struct ucred *cred, struct thread *td);
253 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp,
254     char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp,
255     char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td);
256 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp,
257     struct componentname *scnp, struct sillyrename *sp);
258 
259 /*
260  * Global variables
261  */
262 SYSCTL_DECL(_vfs_nfs);
263 
264 static int	nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
265 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
266 	   &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
267 
268 static int	nfs_prime_access_cache = 0;
269 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
270 	   &nfs_prime_access_cache, 0,
271 	   "Prime NFS ACCESS cache when fetching attributes");
272 
273 static int	newnfs_commit_on_close = 0;
274 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW,
275     &newnfs_commit_on_close, 0, "write+commit on close, else only write");
276 
277 static int	nfs_clean_pages_on_close = 1;
278 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
279 	   &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
280 
281 int newnfs_directio_enable = 0;
282 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
283 	   &newnfs_directio_enable, 0, "Enable NFS directio");
284 
285 int nfs_keep_dirty_on_error;
286 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW,
287     &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned");
288 
289 /*
290  * This sysctl allows other processes to mmap a file that has been opened
291  * O_DIRECT by a process.  In general, having processes mmap the file while
292  * Direct IO is in progress can lead to Data Inconsistencies.  But, we allow
293  * this by default to prevent DoS attacks - to prevent a malicious user from
294  * opening up files O_DIRECT preventing other users from mmap'ing these
295  * files.  "Protected" environments where stricter consistency guarantees are
296  * required can disable this knob.  The process that opened the file O_DIRECT
297  * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
298  * meaningful.
299  */
300 int newnfs_directio_allow_mmap = 1;
301 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
302 	   &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
303 
304 static uint64_t	nfs_maxalloclen = 64 * 1024 * 1024;
305 SYSCTL_U64(_vfs_nfs, OID_AUTO, maxalloclen, CTLFLAG_RW,
306 	   &nfs_maxalloclen, 0, "NFS max allocate/deallocate length");
307 
308 #define	NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY		\
309 			 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE	\
310 			 | NFSACCESS_DELETE | NFSACCESS_LOOKUP)
311 
312 /*
313  * SMP Locking Note :
314  * The list of locks after the description of the lock is the ordering
315  * of other locks acquired with the lock held.
316  * np->n_mtx : Protects the fields in the nfsnode.
317        VM Object Lock
318        VI_MTX (acquired indirectly)
319  * nmp->nm_mtx : Protects the fields in the nfsmount.
320        rep->r_mtx
321  * ncl_iod_mutex : Global lock, protects shared nfsiod state.
322  * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
323        nmp->nm_mtx
324        rep->r_mtx
325  * rep->r_mtx : Protects the fields in an nfsreq.
326  */
327 
328 static int
329 nfs_lock(struct vop_lock1_args *ap)
330 {
331 	struct vnode *vp;
332 	struct nfsnode *np;
333 	u_quad_t nsize;
334 	int error, lktype;
335 	bool onfault;
336 
337 	vp = ap->a_vp;
338 	lktype = ap->a_flags & LK_TYPE_MASK;
339 	error = VOP_LOCK1_APV(&default_vnodeops, ap);
340 	if (error != 0 || vp->v_op != &newnfs_vnodeops)
341 		return (error);
342 	np = VTONFS(vp);
343 	if (np == NULL)
344 		return (0);
345 	NFSLOCKNODE(np);
346 	if ((np->n_flag & NVNSETSZSKIP) == 0 || (lktype != LK_SHARED &&
347 	    lktype != LK_EXCLUSIVE && lktype != LK_UPGRADE &&
348 	    lktype != LK_TRYUPGRADE)) {
349 		NFSUNLOCKNODE(np);
350 		return (0);
351 	}
352 	onfault = (ap->a_flags & LK_EATTR_MASK) == LK_NOWAIT &&
353 	    (ap->a_flags & LK_INIT_MASK) == LK_CANRECURSE &&
354 	    (lktype == LK_SHARED || lktype == LK_EXCLUSIVE);
355 	if (onfault && vp->v_vnlock->lk_recurse == 0) {
356 		/*
357 		 * Force retry in vm_fault(), to make the lock request
358 		 * sleepable, which allows us to piggy-back the
359 		 * sleepable call to vnode_pager_setsize().
360 		 */
361 		NFSUNLOCKNODE(np);
362 		VOP_UNLOCK(vp);
363 		return (EBUSY);
364 	}
365 	if ((ap->a_flags & LK_NOWAIT) != 0 ||
366 	    (lktype == LK_SHARED && vp->v_vnlock->lk_recurse > 0)) {
367 		NFSUNLOCKNODE(np);
368 		return (0);
369 	}
370 	if (lktype == LK_SHARED) {
371 		NFSUNLOCKNODE(np);
372 		VOP_UNLOCK(vp);
373 		ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK);
374 		ap->a_flags |= LK_EXCLUSIVE;
375 		error = VOP_LOCK1_APV(&default_vnodeops, ap);
376 		if (error != 0 || vp->v_op != &newnfs_vnodeops)
377 			return (error);
378 		if (vp->v_data == NULL)
379 			goto downgrade;
380 		MPASS(vp->v_data == np);
381 		NFSLOCKNODE(np);
382 		if ((np->n_flag & NVNSETSZSKIP) == 0) {
383 			NFSUNLOCKNODE(np);
384 			goto downgrade;
385 		}
386 	}
387 	np->n_flag &= ~NVNSETSZSKIP;
388 	nsize = np->n_size;
389 	NFSUNLOCKNODE(np);
390 	vnode_pager_setsize(vp, nsize);
391 downgrade:
392 	if (lktype == LK_SHARED) {
393 		ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK);
394 		ap->a_flags |= LK_DOWNGRADE;
395 		(void)VOP_LOCK1_APV(&default_vnodeops, ap);
396 	}
397 	return (0);
398 }
399 
400 static int
401 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td,
402     struct ucred *cred, u_int32_t *retmode)
403 {
404 	int error = 0, attrflag, i, lrupos;
405 	u_int32_t rmode;
406 	struct nfsnode *np = VTONFS(vp);
407 	struct nfsvattr nfsva;
408 
409 	error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag,
410 	    &rmode, NULL);
411 	if (attrflag)
412 		(void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
413 	if (!error) {
414 		lrupos = 0;
415 		NFSLOCKNODE(np);
416 		for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
417 			if (np->n_accesscache[i].uid == cred->cr_uid) {
418 				np->n_accesscache[i].mode = rmode;
419 				np->n_accesscache[i].stamp = time_second;
420 				break;
421 			}
422 			if (i > 0 && np->n_accesscache[i].stamp <
423 			    np->n_accesscache[lrupos].stamp)
424 				lrupos = i;
425 		}
426 		if (i == NFS_ACCESSCACHESIZE) {
427 			np->n_accesscache[lrupos].uid = cred->cr_uid;
428 			np->n_accesscache[lrupos].mode = rmode;
429 			np->n_accesscache[lrupos].stamp = time_second;
430 		}
431 		NFSUNLOCKNODE(np);
432 		if (retmode != NULL)
433 			*retmode = rmode;
434 		KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0);
435 	} else if (NFS_ISV4(vp)) {
436 		error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
437 	}
438 #ifdef KDTRACE_HOOKS
439 	if (error != 0)
440 		KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0,
441 		    error);
442 #endif
443 	return (error);
444 }
445 
446 /*
447  * nfs access vnode op.
448  * For nfs version 2, just return ok. File accesses may fail later.
449  * For nfs version 3, use the access rpc to check accessibility. If file modes
450  * are changed on the server, accesses might still fail later.
451  */
452 static int
453 nfs_access(struct vop_access_args *ap)
454 {
455 	struct vnode *vp = ap->a_vp;
456 	int error = 0, i, gotahit;
457 	u_int32_t mode, wmode, rmode;
458 	int v34 = NFS_ISV34(vp);
459 	struct nfsnode *np = VTONFS(vp);
460 
461 	/*
462 	 * Disallow write attempts on filesystems mounted read-only;
463 	 * unless the file is a socket, fifo, or a block or character
464 	 * device resident on the filesystem.
465 	 */
466 	if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS |
467 	    VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL |
468 	    VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) {
469 		switch (vp->v_type) {
470 		case VREG:
471 		case VDIR:
472 		case VLNK:
473 			return (EROFS);
474 		default:
475 			break;
476 		}
477 	}
478 	/*
479 	 * For nfs v3 or v4, check to see if we have done this recently, and if
480 	 * so return our cached result instead of making an ACCESS call.
481 	 * If not, do an access rpc, otherwise you are stuck emulating
482 	 * ufs_access() locally using the vattr. This may not be correct,
483 	 * since the server may apply other access criteria such as
484 	 * client uid-->server uid mapping that we do not know about.
485 	 */
486 	if (v34) {
487 		if (ap->a_accmode & VREAD)
488 			mode = NFSACCESS_READ;
489 		else
490 			mode = 0;
491 		if (vp->v_type != VDIR) {
492 			if (ap->a_accmode & VWRITE)
493 				mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
494 			if (ap->a_accmode & VAPPEND)
495 				mode |= NFSACCESS_EXTEND;
496 			if (ap->a_accmode & VEXEC)
497 				mode |= NFSACCESS_EXECUTE;
498 			if (ap->a_accmode & VDELETE)
499 				mode |= NFSACCESS_DELETE;
500 		} else {
501 			if (ap->a_accmode & VWRITE)
502 				mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
503 			if (ap->a_accmode & VAPPEND)
504 				mode |= NFSACCESS_EXTEND;
505 			if (ap->a_accmode & VEXEC)
506 				mode |= NFSACCESS_LOOKUP;
507 			if (ap->a_accmode & VDELETE)
508 				mode |= NFSACCESS_DELETE;
509 			if (ap->a_accmode & VDELETE_CHILD)
510 				mode |= NFSACCESS_MODIFY;
511 		}
512 		/* XXX safety belt, only make blanket request if caching */
513 		if (nfsaccess_cache_timeout > 0) {
514 			wmode = NFSACCESS_READ | NFSACCESS_MODIFY |
515 				NFSACCESS_EXTEND | NFSACCESS_EXECUTE |
516 				NFSACCESS_DELETE | NFSACCESS_LOOKUP;
517 		} else {
518 			wmode = mode;
519 		}
520 
521 		/*
522 		 * Does our cached result allow us to give a definite yes to
523 		 * this request?
524 		 */
525 		gotahit = 0;
526 		NFSLOCKNODE(np);
527 		for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
528 			if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
529 			    if (time_second < (np->n_accesscache[i].stamp
530 				+ nfsaccess_cache_timeout) &&
531 				(np->n_accesscache[i].mode & mode) == mode) {
532 				NFSINCRGLOBAL(nfsstatsv1.accesscache_hits);
533 				gotahit = 1;
534 			    }
535 			    break;
536 			}
537 		}
538 		NFSUNLOCKNODE(np);
539 #ifdef KDTRACE_HOOKS
540 		if (gotahit != 0)
541 			KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp,
542 			    ap->a_cred->cr_uid, mode);
543 		else
544 			KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp,
545 			    ap->a_cred->cr_uid, mode);
546 #endif
547 		if (gotahit == 0) {
548 			/*
549 			 * Either a no, or a don't know.  Go to the wire.
550 			 */
551 			NFSINCRGLOBAL(nfsstatsv1.accesscache_misses);
552 		        error = nfs34_access_otw(vp, wmode, ap->a_td,
553 			    ap->a_cred, &rmode);
554 			if (!error &&
555 			    (rmode & mode) != mode)
556 				error = EACCES;
557 		}
558 		return (error);
559 	} else {
560 		if ((error = nfsspec_access(ap)) != 0) {
561 			return (error);
562 		}
563 		/*
564 		 * Attempt to prevent a mapped root from accessing a file
565 		 * which it shouldn't.  We try to read a byte from the file
566 		 * if the user is root and the file is not zero length.
567 		 * After calling nfsspec_access, we should have the correct
568 		 * file size cached.
569 		 */
570 		NFSLOCKNODE(np);
571 		if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
572 		    && VTONFS(vp)->n_size > 0) {
573 			struct iovec aiov;
574 			struct uio auio;
575 			char buf[1];
576 
577 			NFSUNLOCKNODE(np);
578 			aiov.iov_base = buf;
579 			aiov.iov_len = 1;
580 			auio.uio_iov = &aiov;
581 			auio.uio_iovcnt = 1;
582 			auio.uio_offset = 0;
583 			auio.uio_resid = 1;
584 			auio.uio_segflg = UIO_SYSSPACE;
585 			auio.uio_rw = UIO_READ;
586 			auio.uio_td = ap->a_td;
587 
588 			if (vp->v_type == VREG)
589 				error = ncl_readrpc(vp, &auio, ap->a_cred);
590 			else if (vp->v_type == VDIR) {
591 				char* bp;
592 				bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
593 				aiov.iov_base = bp;
594 				aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
595 				error = ncl_readdirrpc(vp, &auio, ap->a_cred,
596 				    ap->a_td);
597 				free(bp, M_TEMP);
598 			} else if (vp->v_type == VLNK)
599 				error = ncl_readlinkrpc(vp, &auio, ap->a_cred);
600 			else
601 				error = EACCES;
602 		} else
603 			NFSUNLOCKNODE(np);
604 		return (error);
605 	}
606 }
607 
608 /*
609  * nfs open vnode op
610  * Check to see if the type is ok
611  * and that deletion is not in progress.
612  * For paged in text files, you will need to flush the page cache
613  * if consistency is lost.
614  */
615 /* ARGSUSED */
616 static int
617 nfs_open(struct vop_open_args *ap)
618 {
619 	struct vnode *vp = ap->a_vp;
620 	struct nfsnode *np = VTONFS(vp);
621 	struct vattr vattr;
622 	int error;
623 	int fmode = ap->a_mode;
624 	struct ucred *cred;
625 	vm_object_t obj;
626 
627 	if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
628 		return (EOPNOTSUPP);
629 
630 	/*
631 	 * For NFSv4, we need to do the Open Op before cache validation,
632 	 * so that we conform to RFC3530 Sec. 9.3.1.
633 	 */
634 	if (NFS_ISV4(vp)) {
635 		error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);
636 		if (error) {
637 			error = nfscl_maperr(ap->a_td, error, (uid_t)0,
638 			    (gid_t)0);
639 			return (error);
640 		}
641 	}
642 
643 	/*
644 	 * Now, if this Open will be doing reading, re-validate/flush the
645 	 * cache, so that Close/Open coherency is maintained.
646 	 */
647 	NFSLOCKNODE(np);
648 	if (np->n_flag & NMODIFIED) {
649 		NFSUNLOCKNODE(np);
650 		if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
651 			NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
652 			if (VN_IS_DOOMED(vp))
653 				return (EBADF);
654 		}
655 		error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
656 		if (error == EINTR || error == EIO) {
657 			if (NFS_ISV4(vp))
658 				(void) nfsrpc_close(vp, 0, ap->a_td);
659 			return (error);
660 		}
661 		NFSLOCKNODE(np);
662 		np->n_attrstamp = 0;
663 		KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
664 		if (vp->v_type == VDIR)
665 			np->n_direofoffset = 0;
666 		NFSUNLOCKNODE(np);
667 		error = VOP_GETATTR(vp, &vattr, ap->a_cred);
668 		if (error) {
669 			if (NFS_ISV4(vp))
670 				(void) nfsrpc_close(vp, 0, ap->a_td);
671 			return (error);
672 		}
673 		NFSLOCKNODE(np);
674 		np->n_mtime = vattr.va_mtime;
675 		if (NFS_ISV4(vp))
676 			np->n_change = vattr.va_filerev;
677 	} else {
678 		NFSUNLOCKNODE(np);
679 		error = VOP_GETATTR(vp, &vattr, ap->a_cred);
680 		if (error) {
681 			if (NFS_ISV4(vp))
682 				(void) nfsrpc_close(vp, 0, ap->a_td);
683 			return (error);
684 		}
685 		NFSLOCKNODE(np);
686 		if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) ||
687 		    NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
688 			if (vp->v_type == VDIR)
689 				np->n_direofoffset = 0;
690 			NFSUNLOCKNODE(np);
691 			if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
692 				NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
693 				if (VN_IS_DOOMED(vp))
694 					return (EBADF);
695 			}
696 			error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
697 			if (error == EINTR || error == EIO) {
698 				if (NFS_ISV4(vp))
699 					(void) nfsrpc_close(vp, 0, ap->a_td);
700 				return (error);
701 			}
702 			NFSLOCKNODE(np);
703 			np->n_mtime = vattr.va_mtime;
704 			if (NFS_ISV4(vp))
705 				np->n_change = vattr.va_filerev;
706 		}
707 	}
708 
709 	/*
710 	 * If the object has >= 1 O_DIRECT active opens, we disable caching.
711 	 */
712 	if (newnfs_directio_enable && (fmode & O_DIRECT) &&
713 	    (vp->v_type == VREG)) {
714 		if (np->n_directio_opens == 0) {
715 			NFSUNLOCKNODE(np);
716 			if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
717 				NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
718 				if (VN_IS_DOOMED(vp))
719 					return (EBADF);
720 			}
721 			error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
722 			if (error) {
723 				if (NFS_ISV4(vp))
724 					(void) nfsrpc_close(vp, 0, ap->a_td);
725 				return (error);
726 			}
727 			NFSLOCKNODE(np);
728 			np->n_flag |= NNONCACHE;
729 		}
730 		np->n_directio_opens++;
731 	}
732 
733 	/* If opened for writing via NFSv4.1 or later, mark that for pNFS. */
734 	if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0)
735 		np->n_flag |= NWRITEOPENED;
736 
737 	/*
738 	 * If this is an open for writing, capture a reference to the
739 	 * credentials, so they can be used by ncl_putpages(). Using
740 	 * these write credentials is preferable to the credentials of
741 	 * whatever thread happens to be doing the VOP_PUTPAGES() since
742 	 * the write RPCs are less likely to fail with EACCES.
743 	 */
744 	if ((fmode & FWRITE) != 0) {
745 		cred = np->n_writecred;
746 		np->n_writecred = crhold(ap->a_cred);
747 	} else
748 		cred = NULL;
749 	NFSUNLOCKNODE(np);
750 
751 	if (cred != NULL)
752 		crfree(cred);
753 	vnode_create_vobject(vp, vattr.va_size, ap->a_td);
754 
755 	/*
756 	 * If the text file has been mmap'd, flush any dirty pages to the
757 	 * buffer cache and then...
758 	 * Make sure all writes are pushed to the NFS server.  If this is not
759 	 * done, the modify time of the file can change while the text
760 	 * file is being executed.  This will cause the process that is
761 	 * executing the text file to be terminated.
762 	 */
763 	if (vp->v_writecount <= -1) {
764 		if ((obj = vp->v_object) != NULL &&
765 		    vm_object_mightbedirty(obj)) {
766 			if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
767 				NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
768 				if (VN_IS_DOOMED(vp))
769 					return (EBADF);
770 			}
771 			VM_OBJECT_WLOCK(obj);
772 			vm_object_page_clean(obj, 0, 0, OBJPC_SYNC);
773 			VM_OBJECT_WUNLOCK(obj);
774 		}
775 
776 		/* Now, flush the buffer cache. */
777 		ncl_flush(vp, MNT_WAIT, curthread, 0, 0);
778 
779 		/* And, finally, make sure that n_mtime is up to date. */
780 		np = VTONFS(vp);
781 		NFSLOCKNODE(np);
782 		np->n_mtime = np->n_vattr.na_mtime;
783 		NFSUNLOCKNODE(np);
784 	}
785 	return (0);
786 }
787 
788 /*
789  * nfs close vnode op
790  * What an NFS client should do upon close after writing is a debatable issue.
791  * Most NFS clients push delayed writes to the server upon close, basically for
792  * two reasons:
793  * 1 - So that any write errors may be reported back to the client process
794  *     doing the close system call. By far the two most likely errors are
795  *     NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
796  * 2 - To put a worst case upper bound on cache inconsistency between
797  *     multiple clients for the file.
798  * There is also a consistency problem for Version 2 of the protocol w.r.t.
799  * not being able to tell if other clients are writing a file concurrently,
800  * since there is no way of knowing if the changed modify time in the reply
801  * is only due to the write for this client.
802  * (NFS Version 3 provides weak cache consistency data in the reply that
803  *  should be sufficient to detect and handle this case.)
804  *
805  * The current code does the following:
806  * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
807  * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
808  *                     or commit them (this satisfies 1 and 2 except for the
809  *                     case where the server crashes after this close but
810  *                     before the commit RPC, which is felt to be "good
811  *                     enough". Changing the last argument to ncl_flush() to
812  *                     a 1 would force a commit operation, if it is felt a
813  *                     commit is necessary now.
814  * for NFS Version 4 - flush the dirty buffers and commit them, if
815  *		       nfscl_mustflush() says this is necessary.
816  *                     It is necessary if there is no write delegation held,
817  *                     in order to satisfy open/close coherency.
818  *                     If the file isn't cached on local stable storage,
819  *                     it may be necessary in order to detect "out of space"
820  *                     errors from the server, if the write delegation
821  *                     issued by the server doesn't allow the file to grow.
822  */
823 /* ARGSUSED */
824 static int
825 nfs_close(struct vop_close_args *ap)
826 {
827 	struct vnode *vp = ap->a_vp;
828 	struct nfsnode *np = VTONFS(vp);
829 	struct nfsvattr nfsva;
830 	struct ucred *cred;
831 	int error = 0, ret, localcred = 0;
832 	int fmode = ap->a_fflag;
833 
834 	if (NFSCL_FORCEDISM(vp->v_mount))
835 		return (0);
836 	/*
837 	 * During shutdown, a_cred isn't valid, so just use root.
838 	 */
839 	if (ap->a_cred == NOCRED) {
840 		cred = newnfs_getcred();
841 		localcred = 1;
842 	} else {
843 		cred = ap->a_cred;
844 	}
845 	if (vp->v_type == VREG) {
846 	    /*
847 	     * Examine and clean dirty pages, regardless of NMODIFIED.
848 	     * This closes a major hole in close-to-open consistency.
849 	     * We want to push out all dirty pages (and buffers) on
850 	     * close, regardless of whether they were dirtied by
851 	     * mmap'ed writes or via write().
852 	     */
853 	    if (nfs_clean_pages_on_close && vp->v_object) {
854 		if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
855 			NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
856 			if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK)
857 				return (EBADF);
858 		}
859 		VM_OBJECT_WLOCK(vp->v_object);
860 		vm_object_page_clean(vp->v_object, 0, 0, 0);
861 		VM_OBJECT_WUNLOCK(vp->v_object);
862 	    }
863 	    NFSLOCKNODE(np);
864 	    if (np->n_flag & NMODIFIED) {
865 		NFSUNLOCKNODE(np);
866 		if (NFS_ISV3(vp)) {
867 		    /*
868 		     * Under NFSv3 we have dirty buffers to dispose of.  We
869 		     * must flush them to the NFS server.  We have the option
870 		     * of waiting all the way through the commit rpc or just
871 		     * waiting for the initial write.  The default is to only
872 		     * wait through the initial write so the data is in the
873 		     * server's cache, which is roughly similar to the state
874 		     * a standard disk subsystem leaves the file in on close().
875 		     *
876 		     * We cannot clear the NMODIFIED bit in np->n_flag due to
877 		     * potential races with other processes, and certainly
878 		     * cannot clear it if we don't commit.
879 		     * These races occur when there is no longer the old
880 		     * traditional vnode locking implemented for Vnode Ops.
881 		     */
882 		    int cm = newnfs_commit_on_close ? 1 : 0;
883 		    if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
884 			    NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
885 			    if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK)
886 				    return (EBADF);
887 		    }
888 		    error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0);
889 		    /* np->n_flag &= ~NMODIFIED; */
890 		} else if (NFS_ISV4(vp)) {
891 			if (nfscl_mustflush(vp) != 0) {
892 				int cm = newnfs_commit_on_close ? 1 : 0;
893 				if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
894 					NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
895 					if (VN_IS_DOOMED(vp) && ap->a_fflag !=
896 					    FNONBLOCK)
897 						return (EBADF);
898 				}
899 				error = ncl_flush(vp, MNT_WAIT, ap->a_td,
900 				    cm, 0);
901 				/*
902 				 * as above w.r.t races when clearing
903 				 * NMODIFIED.
904 				 * np->n_flag &= ~NMODIFIED;
905 				 */
906 			}
907 		} else {
908 			if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
909 				NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
910 				if (VN_IS_DOOMED(vp) && ap->a_fflag !=
911 				    FNONBLOCK)
912 					return (EBADF);
913 			}
914 			error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
915 		}
916 		NFSLOCKNODE(np);
917 	    }
918  	    /*
919  	     * Invalidate the attribute cache in all cases.
920  	     * An open is going to fetch fresh attrs any way, other procs
921  	     * on this node that have file open will be forced to do an
922  	     * otw attr fetch, but this is safe.
923 	     * --> A user found that their RPC count dropped by 20% when
924 	     *     this was commented out and I can't see any requirement
925 	     *     for it, so I've disabled it when negative lookups are
926 	     *     enabled. (What does this have to do with negative lookup
927 	     *     caching? Well nothing, except it was reported by the
928 	     *     same user that needed negative lookup caching and I wanted
929 	     *     there to be a way to disable it to see if it
930 	     *     is the cause of some caching/coherency issue that might
931 	     *     crop up.)
932  	     */
933 	    if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) {
934 		    np->n_attrstamp = 0;
935 		    KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
936 	    }
937 	    if (np->n_flag & NWRITEERR) {
938 		np->n_flag &= ~NWRITEERR;
939 		error = np->n_error;
940 	    }
941 	    NFSUNLOCKNODE(np);
942 	}
943 
944 	if (NFS_ISV4(vp)) {
945 		/*
946 		 * Get attributes so "change" is up to date.
947 		 */
948 		if (error == 0 && nfscl_mustflush(vp) != 0 &&
949 		    vp->v_type == VREG &&
950 		    (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) {
951 			ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
952 			    NULL);
953 			if (!ret) {
954 				np->n_change = nfsva.na_filerev;
955 				(void) nfscl_loadattrcache(&vp, &nfsva, NULL,
956 				    0, 0);
957 			}
958 		}
959 
960 		/*
961 		 * and do the close.
962 		 */
963 		ret = nfsrpc_close(vp, 0, ap->a_td);
964 		if (!error && ret)
965 			error = ret;
966 		if (error)
967 			error = nfscl_maperr(ap->a_td, error, (uid_t)0,
968 			    (gid_t)0);
969 	}
970 	if (newnfs_directio_enable)
971 		KASSERT((np->n_directio_asyncwr == 0),
972 			("nfs_close: dirty unflushed (%d) directio buffers\n",
973 			 np->n_directio_asyncwr));
974 	if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
975 		NFSLOCKNODE(np);
976 		KASSERT((np->n_directio_opens > 0),
977 			("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
978 		np->n_directio_opens--;
979 		if (np->n_directio_opens == 0)
980 			np->n_flag &= ~NNONCACHE;
981 		NFSUNLOCKNODE(np);
982 	}
983 	if (localcred)
984 		NFSFREECRED(cred);
985 	return (error);
986 }
987 
988 /*
989  * nfs getattr call from vfs.
990  */
991 static int
992 nfs_getattr(struct vop_getattr_args *ap)
993 {
994 	struct vnode *vp = ap->a_vp;
995 	struct thread *td = curthread;	/* XXX */
996 	struct nfsnode *np = VTONFS(vp);
997 	int error = 0;
998 	struct nfsvattr nfsva;
999 	struct vattr *vap = ap->a_vap;
1000 	struct vattr vattr;
1001 
1002 	/*
1003 	 * Update local times for special files.
1004 	 */
1005 	NFSLOCKNODE(np);
1006 	if (np->n_flag & (NACC | NUPD))
1007 		np->n_flag |= NCHG;
1008 	NFSUNLOCKNODE(np);
1009 	/*
1010 	 * First look in the cache.
1011 	 */
1012 	if (ncl_getattrcache(vp, &vattr) == 0) {
1013 		ncl_copy_vattr(vap, &vattr);
1014 
1015 		/*
1016 		 * Get the local modify time for the case of a write
1017 		 * delegation.
1018 		 */
1019 		nfscl_deleggetmodtime(vp, &vap->va_mtime);
1020 		return (0);
1021 	}
1022 
1023 	if (NFS_ISV34(vp) && nfs_prime_access_cache &&
1024 	    nfsaccess_cache_timeout > 0) {
1025 		NFSINCRGLOBAL(nfsstatsv1.accesscache_misses);
1026 		nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
1027 		if (ncl_getattrcache(vp, ap->a_vap) == 0) {
1028 			nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
1029 			return (0);
1030 		}
1031 	}
1032 	error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
1033 	if (!error)
1034 		error = nfscl_loadattrcache(&vp, &nfsva, vap, 0, 0);
1035 	if (!error) {
1036 		/*
1037 		 * Get the local modify time for the case of a write
1038 		 * delegation.
1039 		 */
1040 		nfscl_deleggetmodtime(vp, &vap->va_mtime);
1041 	} else if (NFS_ISV4(vp)) {
1042 		error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1043 	}
1044 	return (error);
1045 }
1046 
1047 /*
1048  * nfs setattr call.
1049  */
1050 static int
1051 nfs_setattr(struct vop_setattr_args *ap)
1052 {
1053 	struct vnode *vp = ap->a_vp;
1054 	struct nfsnode *np = VTONFS(vp);
1055 	struct thread *td = curthread;	/* XXX */
1056 	struct vattr *vap = ap->a_vap;
1057 	int error = 0;
1058 	u_quad_t tsize;
1059 	struct timespec ts;
1060 
1061 #ifndef nolint
1062 	tsize = (u_quad_t)0;
1063 #endif
1064 
1065 	/*
1066 	 * Setting of flags and marking of atimes are not supported.
1067 	 */
1068 	if (vap->va_flags != VNOVAL)
1069 		return (EOPNOTSUPP);
1070 
1071 	/*
1072 	 * Disallow write attempts if the filesystem is mounted read-only.
1073 	 */
1074   	if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
1075 	    vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
1076 	    vap->va_mtime.tv_sec != VNOVAL ||
1077 	    vap->va_birthtime.tv_sec != VNOVAL ||
1078 	    vap->va_mode != (mode_t)VNOVAL) &&
1079 	    (vp->v_mount->mnt_flag & MNT_RDONLY))
1080 		return (EROFS);
1081 	if (vap->va_size != VNOVAL) {
1082  		switch (vp->v_type) {
1083  		case VDIR:
1084  			return (EISDIR);
1085  		case VCHR:
1086  		case VBLK:
1087  		case VSOCK:
1088  		case VFIFO:
1089 			if (vap->va_mtime.tv_sec == VNOVAL &&
1090 			    vap->va_atime.tv_sec == VNOVAL &&
1091 			    vap->va_birthtime.tv_sec == VNOVAL &&
1092 			    vap->va_mode == (mode_t)VNOVAL &&
1093 			    vap->va_uid == (uid_t)VNOVAL &&
1094 			    vap->va_gid == (gid_t)VNOVAL)
1095 				return (0);
1096  			vap->va_size = VNOVAL;
1097  			break;
1098  		default:
1099 			/*
1100 			 * Disallow write attempts if the filesystem is
1101 			 * mounted read-only.
1102 			 */
1103 			if (vp->v_mount->mnt_flag & MNT_RDONLY)
1104 				return (EROFS);
1105 			/*
1106 			 *  We run vnode_pager_setsize() early (why?),
1107 			 * we must set np->n_size now to avoid vinvalbuf
1108 			 * V_SAVE races that might setsize a lower
1109 			 * value.
1110 			 */
1111 			NFSLOCKNODE(np);
1112 			tsize = np->n_size;
1113 			NFSUNLOCKNODE(np);
1114 			error = ncl_meta_setsize(vp, td, vap->va_size);
1115 			NFSLOCKNODE(np);
1116  			if (np->n_flag & NMODIFIED) {
1117 			    tsize = np->n_size;
1118 			    NFSUNLOCKNODE(np);
1119 			    error = ncl_vinvalbuf(vp, vap->va_size == 0 ?
1120 			        0 : V_SAVE, td, 1);
1121 			    if (error != 0) {
1122 				    vnode_pager_setsize(vp, tsize);
1123 				    return (error);
1124 			    }
1125 			    /*
1126 			     * Call nfscl_delegmodtime() to set the modify time
1127 			     * locally, as required.
1128 			     */
1129 			    nfscl_delegmodtime(vp);
1130  			} else
1131 			    NFSUNLOCKNODE(np);
1132 			/*
1133 			 * np->n_size has already been set to vap->va_size
1134 			 * in ncl_meta_setsize(). We must set it again since
1135 			 * nfs_loadattrcache() could be called through
1136 			 * ncl_meta_setsize() and could modify np->n_size.
1137 			 */
1138 			NFSLOCKNODE(np);
1139  			np->n_vattr.na_size = np->n_size = vap->va_size;
1140 			NFSUNLOCKNODE(np);
1141   		}
1142   	} else {
1143 		NFSLOCKNODE(np);
1144 		if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) &&
1145 		    (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
1146 			NFSUNLOCKNODE(np);
1147 			error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
1148 			if (error == EINTR || error == EIO)
1149 				return (error);
1150 		} else
1151 			NFSUNLOCKNODE(np);
1152 	}
1153 	error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
1154 	if (vap->va_size != VNOVAL) {
1155 		if (error == 0) {
1156 			nanouptime(&ts);
1157 			NFSLOCKNODE(np);
1158 			np->n_localmodtime = ts;
1159 			NFSUNLOCKNODE(np);
1160 		} else {
1161 			NFSLOCKNODE(np);
1162 			np->n_size = np->n_vattr.na_size = tsize;
1163 			vnode_pager_setsize(vp, tsize);
1164 			NFSUNLOCKNODE(np);
1165 		}
1166 	}
1167 	return (error);
1168 }
1169 
1170 /*
1171  * Do an nfs setattr rpc.
1172  */
1173 static int
1174 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
1175     struct thread *td)
1176 {
1177 	struct nfsnode *np = VTONFS(vp);
1178 	int error, ret, attrflag, i;
1179 	struct nfsvattr nfsva;
1180 
1181 	if (NFS_ISV34(vp)) {
1182 		NFSLOCKNODE(np);
1183 		for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
1184 			np->n_accesscache[i].stamp = 0;
1185 		np->n_flag |= NDELEGMOD;
1186 		NFSUNLOCKNODE(np);
1187 		KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
1188 	}
1189 	error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
1190 	    NULL);
1191 	if (attrflag) {
1192 		ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
1193 		if (ret && !error)
1194 			error = ret;
1195 	}
1196 	if (error && NFS_ISV4(vp))
1197 		error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
1198 	return (error);
1199 }
1200 
1201 /*
1202  * nfs lookup call, one step at a time...
1203  * First look in cache
1204  * If not found, unlock the directory nfsnode and do the rpc
1205  */
1206 static int
1207 nfs_lookup(struct vop_lookup_args *ap)
1208 {
1209 	struct componentname *cnp = ap->a_cnp;
1210 	struct vnode *dvp = ap->a_dvp;
1211 	struct vnode **vpp = ap->a_vpp;
1212 	struct mount *mp = dvp->v_mount;
1213 	int flags = cnp->cn_flags;
1214 	struct vnode *newvp;
1215 	struct nfsmount *nmp;
1216 	struct nfsnode *np, *newnp;
1217 	int error = 0, attrflag, dattrflag, ltype, ncticks;
1218 	struct thread *td = curthread;
1219 	struct nfsfh *nfhp;
1220 	struct nfsvattr dnfsva, nfsva;
1221 	struct vattr vattr;
1222 	struct timespec nctime, ts;
1223 	uint32_t openmode;
1224 
1225 	*vpp = NULLVP;
1226 	if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
1227 	    (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
1228 		return (EROFS);
1229 	if (dvp->v_type != VDIR)
1230 		return (ENOTDIR);
1231 	nmp = VFSTONFS(mp);
1232 	np = VTONFS(dvp);
1233 
1234 	/* For NFSv4, wait until any remove is done. */
1235 	NFSLOCKNODE(np);
1236 	while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
1237 		np->n_flag |= NREMOVEWANT;
1238 		(void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
1239 	}
1240 	NFSUNLOCKNODE(np);
1241 
1242 	error = vn_dir_check_exec(dvp, cnp);
1243 	if (error != 0)
1244 		return (error);
1245 	error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks);
1246 	if (error > 0 && error != ENOENT)
1247 		return (error);
1248 	if (error == -1) {
1249 		/*
1250 		 * Lookups of "." are special and always return the
1251 		 * current directory.  cache_lookup() already handles
1252 		 * associated locking bookkeeping, etc.
1253 		 */
1254 		if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
1255 			/* XXX: Is this really correct? */
1256 			if (cnp->cn_nameiop != LOOKUP &&
1257 			    (flags & ISLASTCN))
1258 				cnp->cn_flags |= SAVENAME;
1259 			return (0);
1260 		}
1261 
1262 		/*
1263 		 * We only accept a positive hit in the cache if the
1264 		 * change time of the file matches our cached copy.
1265 		 * Otherwise, we discard the cache entry and fallback
1266 		 * to doing a lookup RPC.  We also only trust cache
1267 		 * entries for less than nm_nametimeo seconds.
1268 		 *
1269 		 * To better handle stale file handles and attributes,
1270 		 * clear the attribute cache of this node if it is a
1271 		 * leaf component, part of an open() call, and not
1272 		 * locally modified before fetching the attributes.
1273 		 * This should allow stale file handles to be detected
1274 		 * here where we can fall back to a LOOKUP RPC to
1275 		 * recover rather than having nfs_open() detect the
1276 		 * stale file handle and failing open(2) with ESTALE.
1277 		 */
1278 		newvp = *vpp;
1279 		newnp = VTONFS(newvp);
1280 		if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
1281 		    (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1282 		    !(newnp->n_flag & NMODIFIED)) {
1283 			NFSLOCKNODE(newnp);
1284 			newnp->n_attrstamp = 0;
1285 			KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1286 			NFSUNLOCKNODE(newnp);
1287 		}
1288 		if (nfscl_nodeleg(newvp, 0) == 0 ||
1289 		    ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
1290 		    VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
1291 		    timespeccmp(&vattr.va_ctime, &nctime, ==))) {
1292 			NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits);
1293 			if (cnp->cn_nameiop != LOOKUP &&
1294 			    (flags & ISLASTCN))
1295 				cnp->cn_flags |= SAVENAME;
1296 			return (0);
1297 		}
1298 		cache_purge(newvp);
1299 		if (dvp != newvp)
1300 			vput(newvp);
1301 		else
1302 			vrele(newvp);
1303 		*vpp = NULLVP;
1304 	} else if (error == ENOENT) {
1305 		if (VN_IS_DOOMED(dvp))
1306 			return (ENOENT);
1307 		/*
1308 		 * We only accept a negative hit in the cache if the
1309 		 * modification time of the parent directory matches
1310 		 * the cached copy in the name cache entry.
1311 		 * Otherwise, we discard all of the negative cache
1312 		 * entries for this directory.  We also only trust
1313 		 * negative cache entries for up to nm_negnametimeo
1314 		 * seconds.
1315 		 */
1316 		if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
1317 		    VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
1318 		    timespeccmp(&vattr.va_mtime, &nctime, ==)) {
1319 			NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits);
1320 			return (ENOENT);
1321 		}
1322 		cache_purge_negative(dvp);
1323 	}
1324 
1325 	openmode = 0;
1326 #if 0
1327 	/*
1328 	 * The use of LookupOpen breaks some builds.  It is disabled
1329 	 * until that is fixed.
1330 	 */
1331 	/*
1332 	 * If this an NFSv4.1/4.2 mount using the "oneopenown" mount
1333 	 * option, it is possible to do the Open operation in the same
1334 	 * compound as Lookup, so long as delegations are not being
1335 	 * issued.  This saves doing a separate RPC for Open.
1336 	 * For pnfs, do not do this, since the Open+LayoutGet will
1337 	 * be needed as a separate RPC.
1338 	 */
1339 	NFSLOCKMNT(nmp);
1340 	if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp) && !NFSHASPNFS(nmp) &&
1341 	    (nmp->nm_privflag & NFSMNTP_DELEGISSUED) == 0 &&
1342 	    (!NFSMNT_RDONLY(mp) || (flags & OPENWRITE) == 0) &&
1343 	    (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN)) {
1344 		if ((flags & OPENREAD) != 0)
1345 			openmode |= NFSV4OPEN_ACCESSREAD;
1346 		if ((flags & OPENWRITE) != 0)
1347 			openmode |= NFSV4OPEN_ACCESSWRITE;
1348 	}
1349 	NFSUNLOCKMNT(nmp);
1350 #endif
1351 
1352 	newvp = NULLVP;
1353 	NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses);
1354 	nanouptime(&ts);
1355 	error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1356 	    cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1357 	    NULL, openmode);
1358 	if (dattrflag)
1359 		(void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
1360 	if (error) {
1361 		if (newvp != NULLVP) {
1362 			vput(newvp);
1363 			*vpp = NULLVP;
1364 		}
1365 
1366 		if (error != ENOENT) {
1367 			if (NFS_ISV4(dvp))
1368 				error = nfscl_maperr(td, error, (uid_t)0,
1369 				    (gid_t)0);
1370 			return (error);
1371 		}
1372 
1373 		/* The requested file was not found. */
1374 		if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
1375 		    (flags & ISLASTCN)) {
1376 			/*
1377 			 * XXX: UFS does a full VOP_ACCESS(dvp,
1378 			 * VWRITE) here instead of just checking
1379 			 * MNT_RDONLY.
1380 			 */
1381 			if (mp->mnt_flag & MNT_RDONLY)
1382 				return (EROFS);
1383 			cnp->cn_flags |= SAVENAME;
1384 			return (EJUSTRETURN);
1385 		}
1386 
1387 		if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) {
1388 			/*
1389 			 * Cache the modification time of the parent
1390 			 * directory from the post-op attributes in
1391 			 * the name cache entry.  The negative cache
1392 			 * entry will be ignored once the directory
1393 			 * has changed.  Don't bother adding the entry
1394 			 * if the directory has already changed.
1395 			 */
1396 			NFSLOCKNODE(np);
1397 			if (timespeccmp(&np->n_vattr.na_mtime,
1398 			    &dnfsva.na_mtime, ==)) {
1399 				NFSUNLOCKNODE(np);
1400 				cache_enter_time(dvp, NULL, cnp,
1401 				    &dnfsva.na_mtime, NULL);
1402 			} else
1403 				NFSUNLOCKNODE(np);
1404 		}
1405 		return (ENOENT);
1406 	}
1407 
1408 	/*
1409 	 * Handle RENAME case...
1410 	 */
1411 	if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
1412 		if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1413 			free(nfhp, M_NFSFH);
1414 			return (EISDIR);
1415 		}
1416 		error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, LK_EXCLUSIVE);
1417 		if (error)
1418 			return (error);
1419 		newvp = NFSTOV(np);
1420 		/*
1421 		 * If n_localmodtime >= time before RPC, then
1422 		 * a file modification operation, such as
1423 		 * VOP_SETATTR() of size, has occurred while
1424 		 * the Lookup RPC and acquisition of the vnode
1425 		 * happened.  As such, the attributes might
1426 		 * be stale, with possibly an incorrect size.
1427 		 */
1428 		NFSLOCKNODE(np);
1429 		if (timespecisset(&np->n_localmodtime) &&
1430 		    timespeccmp(&np->n_localmodtime, &ts, >=)) {
1431 			NFSCL_DEBUG(4, "nfs_lookup: rename localmod "
1432 			    "stale attributes\n");
1433 			attrflag = 0;
1434 		}
1435 		NFSUNLOCKNODE(np);
1436 		if (attrflag)
1437 			(void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
1438 		*vpp = newvp;
1439 		cnp->cn_flags |= SAVENAME;
1440 		return (0);
1441 	}
1442 
1443 	if (flags & ISDOTDOT) {
1444 		ltype = NFSVOPISLOCKED(dvp);
1445 		error = vfs_busy(mp, MBF_NOWAIT);
1446 		if (error != 0) {
1447 			vfs_ref(mp);
1448 			NFSVOPUNLOCK(dvp);
1449 			error = vfs_busy(mp, 0);
1450 			NFSVOPLOCK(dvp, ltype | LK_RETRY);
1451 			vfs_rel(mp);
1452 			if (error == 0 && VN_IS_DOOMED(dvp)) {
1453 				vfs_unbusy(mp);
1454 				error = ENOENT;
1455 			}
1456 			if (error != 0)
1457 				return (error);
1458 		}
1459 		NFSVOPUNLOCK(dvp);
1460 		error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np,
1461 		    cnp->cn_lkflags);
1462 		if (error == 0)
1463 			newvp = NFSTOV(np);
1464 		vfs_unbusy(mp);
1465 		if (newvp != dvp)
1466 			NFSVOPLOCK(dvp, ltype | LK_RETRY);
1467 		if (VN_IS_DOOMED(dvp)) {
1468 			if (error == 0) {
1469 				if (newvp == dvp)
1470 					vrele(newvp);
1471 				else
1472 					vput(newvp);
1473 			}
1474 			error = ENOENT;
1475 		}
1476 		if (error != 0)
1477 			return (error);
1478 		if (attrflag)
1479 			(void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
1480 	} else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1481 		free(nfhp, M_NFSFH);
1482 		VREF(dvp);
1483 		newvp = dvp;
1484 		if (attrflag)
1485 			(void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
1486 	} else {
1487 		error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np,
1488 		    cnp->cn_lkflags);
1489 		if (error)
1490 			return (error);
1491 		newvp = NFSTOV(np);
1492 		/*
1493 		 * If n_localmodtime >= time before RPC, then
1494 		 * a file modification operation, such as
1495 		 * VOP_SETATTR() of size, has occurred while
1496 		 * the Lookup RPC and acquisition of the vnode
1497 		 * happened.  As such, the attributes might
1498 		 * be stale, with possibly an incorrect size.
1499 		 */
1500 		NFSLOCKNODE(np);
1501 		if (timespecisset(&np->n_localmodtime) &&
1502 		    timespeccmp(&np->n_localmodtime, &ts, >=)) {
1503 			NFSCL_DEBUG(4, "nfs_lookup: localmod "
1504 			    "stale attributes\n");
1505 			attrflag = 0;
1506 		}
1507 		NFSUNLOCKNODE(np);
1508 		if (attrflag)
1509 			(void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
1510 		else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1511 		    !(np->n_flag & NMODIFIED)) {
1512 			/*
1513 			 * Flush the attribute cache when opening a
1514 			 * leaf node to ensure that fresh attributes
1515 			 * are fetched in nfs_open() since we did not
1516 			 * fetch attributes from the LOOKUP reply.
1517 			 */
1518 			NFSLOCKNODE(np);
1519 			np->n_attrstamp = 0;
1520 			KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1521 			NFSUNLOCKNODE(np);
1522 		}
1523 	}
1524 	if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
1525 		cnp->cn_flags |= SAVENAME;
1526 	if ((cnp->cn_flags & MAKEENTRY) && dvp != newvp &&
1527 	    (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
1528 	    attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
1529 		cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
1530 		    newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime);
1531 	*vpp = newvp;
1532 	return (0);
1533 }
1534 
1535 /*
1536  * nfs read call.
1537  * Just call ncl_bioread() to do the work.
1538  */
1539 static int
1540 nfs_read(struct vop_read_args *ap)
1541 {
1542 	struct vnode *vp = ap->a_vp;
1543 
1544 	switch (vp->v_type) {
1545 	case VREG:
1546 		return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
1547 	case VDIR:
1548 		return (EISDIR);
1549 	default:
1550 		return (EOPNOTSUPP);
1551 	}
1552 }
1553 
1554 /*
1555  * nfs readlink call
1556  */
1557 static int
1558 nfs_readlink(struct vop_readlink_args *ap)
1559 {
1560 	struct vnode *vp = ap->a_vp;
1561 
1562 	if (vp->v_type != VLNK)
1563 		return (EINVAL);
1564 	return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
1565 }
1566 
1567 /*
1568  * Do a readlink rpc.
1569  * Called by ncl_doio() from below the buffer cache.
1570  */
1571 int
1572 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1573 {
1574 	int error, ret, attrflag;
1575 	struct nfsvattr nfsva;
1576 
1577 	error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
1578 	    &attrflag, NULL);
1579 	if (attrflag) {
1580 		ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
1581 		if (ret && !error)
1582 			error = ret;
1583 	}
1584 	if (error && NFS_ISV4(vp))
1585 		error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1586 	return (error);
1587 }
1588 
1589 /*
1590  * nfs read rpc call
1591  * Ditto above
1592  */
1593 int
1594 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1595 {
1596 	int error, ret, attrflag;
1597 	struct nfsvattr nfsva;
1598 	struct nfsmount *nmp;
1599 
1600 	nmp = VFSTONFS(vp->v_mount);
1601 	error = EIO;
1602 	attrflag = 0;
1603 	if (NFSHASPNFS(nmp))
1604 		error = nfscl_doiods(vp, uiop, NULL, NULL,
1605 		    NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td);
1606 	NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error);
1607 	if (error != 0)
1608 		error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva,
1609 		    &attrflag, NULL);
1610 	if (attrflag) {
1611 		ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
1612 		if (ret && !error)
1613 			error = ret;
1614 	}
1615 	if (error && NFS_ISV4(vp))
1616 		error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1617 	return (error);
1618 }
1619 
1620 /*
1621  * nfs write call
1622  */
1623 int
1624 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
1625     int *iomode, int *must_commit, int called_from_strategy, int ioflag)
1626 {
1627 	struct nfsvattr nfsva;
1628 	int error, attrflag, ret;
1629 	struct nfsmount *nmp;
1630 
1631 	nmp = VFSTONFS(vp->v_mount);
1632 	error = EIO;
1633 	attrflag = 0;
1634 	if (NFSHASPNFS(nmp))
1635 		error = nfscl_doiods(vp, uiop, iomode, must_commit,
1636 		    NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td);
1637 	NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error);
1638 	if (error != 0)
1639 		error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
1640 		    uiop->uio_td, &nfsva, &attrflag, called_from_strategy,
1641 		    ioflag);
1642 	if (attrflag) {
1643 		if (VTONFS(vp)->n_flag & ND_NFSV4)
1644 			ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 1, 1);
1645 		else
1646 			ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
1647 		if (ret && !error)
1648 			error = ret;
1649 	}
1650 	if (DOINGASYNC(vp))
1651 		*iomode = NFSWRITE_FILESYNC;
1652 	if (error && NFS_ISV4(vp))
1653 		error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1654 	return (error);
1655 }
1656 
1657 /*
1658  * nfs mknod rpc
1659  * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
1660  * mode set to specify the file type and the size field for rdev.
1661  */
1662 static int
1663 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
1664     struct vattr *vap)
1665 {
1666 	struct nfsvattr nfsva, dnfsva;
1667 	struct vnode *newvp = NULL;
1668 	struct nfsnode *np = NULL, *dnp;
1669 	struct nfsfh *nfhp;
1670 	struct vattr vattr;
1671 	int error = 0, attrflag, dattrflag;
1672 	u_int32_t rdev;
1673 
1674 	if (vap->va_type == VCHR || vap->va_type == VBLK)
1675 		rdev = vap->va_rdev;
1676 	else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
1677 		rdev = 0xffffffff;
1678 	else
1679 		return (EOPNOTSUPP);
1680 	if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1681 		return (error);
1682 	error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
1683 	    rdev, vap->va_type, cnp->cn_cred, curthread, &dnfsva,
1684 	    &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
1685 	if (!error) {
1686 		if (!nfhp)
1687 			(void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1688 			    cnp->cn_namelen, cnp->cn_cred, curthread,
1689 			    &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1690 			    NULL, 0);
1691 		if (nfhp)
1692 			error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1693 			    curthread, &np, LK_EXCLUSIVE);
1694 	}
1695 	if (dattrflag)
1696 		(void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
1697 	if (!error) {
1698 		newvp = NFSTOV(np);
1699 		if (attrflag != 0) {
1700 			error = nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
1701 			if (error != 0)
1702 				vput(newvp);
1703 		}
1704 	}
1705 	if (!error) {
1706 		*vpp = newvp;
1707 	} else if (NFS_ISV4(dvp)) {
1708 		error = nfscl_maperr(curthread, error, vap->va_uid,
1709 		    vap->va_gid);
1710 	}
1711 	dnp = VTONFS(dvp);
1712 	NFSLOCKNODE(dnp);
1713 	dnp->n_flag |= NMODIFIED;
1714 	if (!dattrflag) {
1715 		dnp->n_attrstamp = 0;
1716 		KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1717 	}
1718 	NFSUNLOCKNODE(dnp);
1719 	return (error);
1720 }
1721 
1722 /*
1723  * nfs mknod vop
1724  * just call nfs_mknodrpc() to do the work.
1725  */
1726 /* ARGSUSED */
1727 static int
1728 nfs_mknod(struct vop_mknod_args *ap)
1729 {
1730 	return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
1731 }
1732 
1733 static struct mtx nfs_cverf_mtx;
1734 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex",
1735     MTX_DEF);
1736 
1737 static nfsquad_t
1738 nfs_get_cverf(void)
1739 {
1740 	static nfsquad_t cverf;
1741 	nfsquad_t ret;
1742 	static int cverf_initialized = 0;
1743 
1744 	mtx_lock(&nfs_cverf_mtx);
1745 	if (cverf_initialized == 0) {
1746 		cverf.lval[0] = arc4random();
1747 		cverf.lval[1] = arc4random();
1748 		cverf_initialized = 1;
1749 	} else
1750 		cverf.qval++;
1751 	ret = cverf;
1752 	mtx_unlock(&nfs_cverf_mtx);
1753 
1754 	return (ret);
1755 }
1756 
1757 /*
1758  * nfs file create call
1759  */
1760 static int
1761 nfs_create(struct vop_create_args *ap)
1762 {
1763 	struct vnode *dvp = ap->a_dvp;
1764 	struct vattr *vap = ap->a_vap;
1765 	struct componentname *cnp = ap->a_cnp;
1766 	struct nfsnode *np = NULL, *dnp;
1767 	struct vnode *newvp = NULL;
1768 	struct nfsmount *nmp;
1769 	struct nfsvattr dnfsva, nfsva;
1770 	struct nfsfh *nfhp;
1771 	nfsquad_t cverf;
1772 	int error = 0, attrflag, dattrflag, fmode = 0;
1773 	struct vattr vattr;
1774 
1775 	/*
1776 	 * Oops, not for me..
1777 	 */
1778 	if (vap->va_type == VSOCK)
1779 		return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
1780 
1781 	if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1782 		return (error);
1783 	if (vap->va_vaflags & VA_EXCLUSIVE)
1784 		fmode |= O_EXCL;
1785 	dnp = VTONFS(dvp);
1786 	nmp = VFSTONFS(dvp->v_mount);
1787 again:
1788 	/* For NFSv4, wait until any remove is done. */
1789 	NFSLOCKNODE(dnp);
1790 	while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
1791 		dnp->n_flag |= NREMOVEWANT;
1792 		(void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
1793 	}
1794 	NFSUNLOCKNODE(dnp);
1795 
1796 	cverf = nfs_get_cverf();
1797 	error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1798 	    vap, cverf, fmode, cnp->cn_cred, curthread, &dnfsva, &nfsva,
1799 	    &nfhp, &attrflag, &dattrflag, NULL);
1800 	if (!error) {
1801 		if (nfhp == NULL)
1802 			(void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1803 			    cnp->cn_namelen, cnp->cn_cred, curthread,
1804 			    &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1805 			    NULL, 0);
1806 		if (nfhp != NULL)
1807 			error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1808 			    curthread, &np, LK_EXCLUSIVE);
1809 	}
1810 	if (dattrflag)
1811 		(void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
1812 	if (!error) {
1813 		newvp = NFSTOV(np);
1814 		if (attrflag == 0)
1815 			error = nfsrpc_getattr(newvp, cnp->cn_cred,
1816 			    curthread, &nfsva, NULL);
1817 		if (error == 0)
1818 			error = nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
1819 	}
1820 	if (error) {
1821 		if (newvp != NULL) {
1822 			vput(newvp);
1823 			newvp = NULL;
1824 		}
1825 		if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
1826 		    error == NFSERR_NOTSUPP) {
1827 			fmode &= ~O_EXCL;
1828 			goto again;
1829 		}
1830 	} else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
1831 		if (nfscl_checksattr(vap, &nfsva)) {
1832 			error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
1833 			    curthread, &nfsva, &attrflag, NULL);
1834 			if (error && (vap->va_uid != (uid_t)VNOVAL ||
1835 			    vap->va_gid != (gid_t)VNOVAL)) {
1836 				/* try again without setting uid/gid */
1837 				vap->va_uid = (uid_t)VNOVAL;
1838 				vap->va_gid = (uid_t)VNOVAL;
1839 				error = nfsrpc_setattr(newvp, vap, NULL,
1840 				    cnp->cn_cred, curthread, &nfsva,
1841 				    &attrflag, NULL);
1842 			}
1843 			if (attrflag)
1844 				(void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
1845 				    0, 1);
1846 			if (error != 0)
1847 				vput(newvp);
1848 		}
1849 	}
1850 	if (!error) {
1851 		if ((cnp->cn_flags & MAKEENTRY) && attrflag) {
1852 			if (dvp != newvp)
1853 				cache_enter_time(dvp, newvp, cnp,
1854 				    &nfsva.na_ctime, NULL);
1855 			else
1856 				printf("nfs_create: bogus NFS server returned "
1857 				    "the directory as the new file object\n");
1858 		}
1859 		*ap->a_vpp = newvp;
1860 	} else if (NFS_ISV4(dvp)) {
1861 		error = nfscl_maperr(curthread, error, vap->va_uid,
1862 		    vap->va_gid);
1863 	}
1864 	NFSLOCKNODE(dnp);
1865 	dnp->n_flag |= NMODIFIED;
1866 	if (!dattrflag) {
1867 		dnp->n_attrstamp = 0;
1868 		KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1869 	}
1870 	NFSUNLOCKNODE(dnp);
1871 	return (error);
1872 }
1873 
1874 /*
1875  * nfs file remove call
1876  * To try and make nfs semantics closer to ufs semantics, a file that has
1877  * other processes using the vnode is renamed instead of removed and then
1878  * removed later on the last close.
1879  * - If v_usecount > 1
1880  *	  If a rename is not already in the works
1881  *	     call nfs_sillyrename() to set it up
1882  *     else
1883  *	  do the remove rpc
1884  */
1885 static int
1886 nfs_remove(struct vop_remove_args *ap)
1887 {
1888 	struct vnode *vp = ap->a_vp;
1889 	struct vnode *dvp = ap->a_dvp;
1890 	struct componentname *cnp = ap->a_cnp;
1891 	struct nfsnode *np = VTONFS(vp);
1892 	int error = 0;
1893 	struct vattr vattr;
1894 
1895 	KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
1896 	KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
1897 	if (vp->v_type == VDIR)
1898 		error = EPERM;
1899 	else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
1900 	    VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
1901 	    vattr.va_nlink > 1)) {
1902 		/*
1903 		 * Purge the name cache so that the chance of a lookup for
1904 		 * the name succeeding while the remove is in progress is
1905 		 * minimized. Without node locking it can still happen, such
1906 		 * that an I/O op returns ESTALE, but since you get this if
1907 		 * another host removes the file..
1908 		 */
1909 		cache_purge(vp);
1910 		/*
1911 		 * throw away biocache buffers, mainly to avoid
1912 		 * unnecessary delayed writes later.
1913 		 */
1914 		error = ncl_vinvalbuf(vp, 0, curthread, 1);
1915 		if (error != EINTR && error != EIO)
1916 			/* Do the rpc */
1917 			error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
1918 			    cnp->cn_namelen, cnp->cn_cred, curthread);
1919 		/*
1920 		 * Kludge City: If the first reply to the remove rpc is lost..
1921 		 *   the reply to the retransmitted request will be ENOENT
1922 		 *   since the file was in fact removed
1923 		 *   Therefore, we cheat and return success.
1924 		 */
1925 		if (error == ENOENT)
1926 			error = 0;
1927 	} else if (!np->n_sillyrename)
1928 		error = nfs_sillyrename(dvp, vp, cnp);
1929 	NFSLOCKNODE(np);
1930 	np->n_attrstamp = 0;
1931 	NFSUNLOCKNODE(np);
1932 	KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1933 	return (error);
1934 }
1935 
1936 /*
1937  * nfs file remove rpc called from nfs_inactive
1938  */
1939 int
1940 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
1941 {
1942 	/*
1943 	 * Make sure that the directory vnode is still valid.
1944 	 * XXX we should lock sp->s_dvp here.
1945 	 */
1946 	if (sp->s_dvp->v_type == VBAD)
1947 		return (0);
1948 	return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
1949 	    sp->s_cred, NULL));
1950 }
1951 
1952 /*
1953  * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
1954  */
1955 static int
1956 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
1957     int namelen, struct ucred *cred, struct thread *td)
1958 {
1959 	struct nfsvattr dnfsva;
1960 	struct nfsnode *dnp = VTONFS(dvp);
1961 	int error = 0, dattrflag;
1962 
1963 	NFSLOCKNODE(dnp);
1964 	dnp->n_flag |= NREMOVEINPROG;
1965 	NFSUNLOCKNODE(dnp);
1966 	error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
1967 	    &dattrflag, NULL);
1968 	NFSLOCKNODE(dnp);
1969 	if ((dnp->n_flag & NREMOVEWANT)) {
1970 		dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
1971 		NFSUNLOCKNODE(dnp);
1972 		wakeup((caddr_t)dnp);
1973 	} else {
1974 		dnp->n_flag &= ~NREMOVEINPROG;
1975 		NFSUNLOCKNODE(dnp);
1976 	}
1977 	if (dattrflag)
1978 		(void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
1979 	NFSLOCKNODE(dnp);
1980 	dnp->n_flag |= NMODIFIED;
1981 	if (!dattrflag) {
1982 		dnp->n_attrstamp = 0;
1983 		KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1984 	}
1985 	NFSUNLOCKNODE(dnp);
1986 	if (error && NFS_ISV4(dvp))
1987 		error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1988 	return (error);
1989 }
1990 
1991 /*
1992  * nfs file rename call
1993  */
1994 static int
1995 nfs_rename(struct vop_rename_args *ap)
1996 {
1997 	struct vnode *fvp = ap->a_fvp;
1998 	struct vnode *tvp = ap->a_tvp;
1999 	struct vnode *fdvp = ap->a_fdvp;
2000 	struct vnode *tdvp = ap->a_tdvp;
2001 	struct componentname *tcnp = ap->a_tcnp;
2002 	struct componentname *fcnp = ap->a_fcnp;
2003 	struct nfsnode *fnp = VTONFS(ap->a_fvp);
2004 	struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
2005 	struct nfsv4node *newv4 = NULL;
2006 	int error;
2007 
2008 	KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
2009 	    (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
2010 	/* Check for cross-device rename */
2011 	if ((fvp->v_mount != tdvp->v_mount) ||
2012 	    (tvp && (fvp->v_mount != tvp->v_mount))) {
2013 		error = EXDEV;
2014 		goto out;
2015 	}
2016 
2017 	if (fvp == tvp) {
2018 		printf("nfs_rename: fvp == tvp (can't happen)\n");
2019 		error = 0;
2020 		goto out;
2021 	}
2022 	if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
2023 		goto out;
2024 
2025 	/*
2026 	 * We have to flush B_DELWRI data prior to renaming
2027 	 * the file.  If we don't, the delayed-write buffers
2028 	 * can be flushed out later after the file has gone stale
2029 	 * under NFSV3.  NFSV2 does not have this problem because
2030 	 * ( as far as I can tell ) it flushes dirty buffers more
2031 	 * often.
2032 	 *
2033 	 * Skip the rename operation if the fsync fails, this can happen
2034 	 * due to the server's volume being full, when we pushed out data
2035 	 * that was written back to our cache earlier. Not checking for
2036 	 * this condition can result in potential (silent) data loss.
2037 	 */
2038 	error = VOP_FSYNC(fvp, MNT_WAIT, curthread);
2039 	NFSVOPUNLOCK(fvp);
2040 	if (!error && tvp)
2041 		error = VOP_FSYNC(tvp, MNT_WAIT, curthread);
2042 	if (error)
2043 		goto out;
2044 
2045 	/*
2046 	 * If the tvp exists and is in use, sillyrename it before doing the
2047 	 * rename of the new file over it.
2048 	 * XXX Can't sillyrename a directory.
2049 	 */
2050 	if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
2051 		tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
2052 		vput(tvp);
2053 		tvp = NULL;
2054 	}
2055 
2056 	error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
2057 	    tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
2058 	    curthread);
2059 
2060 	if (error == 0 && NFS_ISV4(tdvp)) {
2061 		/*
2062 		 * For NFSv4, check to see if it is the same name and
2063 		 * replace the name, if it is different.
2064 		 */
2065 		newv4 = malloc(
2066 		    sizeof (struct nfsv4node) +
2067 		    tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
2068 		    M_NFSV4NODE, M_WAITOK);
2069 		NFSLOCKNODE(tdnp);
2070 		NFSLOCKNODE(fnp);
2071 		if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
2072 		    (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
2073 		      NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
2074 		      tcnp->cn_namelen) ||
2075 		      tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
2076 		      NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
2077 			tdnp->n_fhp->nfh_len))) {
2078 #ifdef notdef
2079 { char nnn[100]; int nnnl;
2080 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
2081 bcopy(tcnp->cn_nameptr, nnn, nnnl);
2082 nnn[nnnl] = '\0';
2083 printf("ren replace=%s\n",nnn);
2084 }
2085 #endif
2086 			free(fnp->n_v4, M_NFSV4NODE);
2087 			fnp->n_v4 = newv4;
2088 			newv4 = NULL;
2089 			fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
2090 			fnp->n_v4->n4_namelen = tcnp->cn_namelen;
2091 			NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
2092 			    tdnp->n_fhp->nfh_len);
2093 			NFSBCOPY(tcnp->cn_nameptr,
2094 			    NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
2095 		}
2096 		NFSUNLOCKNODE(tdnp);
2097 		NFSUNLOCKNODE(fnp);
2098 		if (newv4 != NULL)
2099 			free(newv4, M_NFSV4NODE);
2100 	}
2101 
2102 	if (fvp->v_type == VDIR) {
2103 		if (tvp != NULL && tvp->v_type == VDIR)
2104 			cache_purge(tdvp);
2105 		cache_purge(fdvp);
2106 	}
2107 
2108 out:
2109 	if (tdvp == tvp)
2110 		vrele(tdvp);
2111 	else
2112 		vput(tdvp);
2113 	if (tvp)
2114 		vput(tvp);
2115 	vrele(fdvp);
2116 	vrele(fvp);
2117 	/*
2118 	 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
2119 	 */
2120 	if (error == ENOENT)
2121 		error = 0;
2122 	return (error);
2123 }
2124 
2125 /*
2126  * nfs file rename rpc called from nfs_remove() above
2127  */
2128 static int
2129 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
2130     struct sillyrename *sp)
2131 {
2132 
2133 	return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
2134 	    sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
2135 	    curthread));
2136 }
2137 
2138 /*
2139  * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
2140  */
2141 static int
2142 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
2143     int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
2144     int tnamelen, struct ucred *cred, struct thread *td)
2145 {
2146 	struct nfsvattr fnfsva, tnfsva;
2147 	struct nfsnode *fdnp = VTONFS(fdvp);
2148 	struct nfsnode *tdnp = VTONFS(tdvp);
2149 	int error = 0, fattrflag, tattrflag;
2150 
2151 	error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
2152 	    tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
2153 	    &tattrflag, NULL, NULL);
2154 	NFSLOCKNODE(fdnp);
2155 	fdnp->n_flag |= NMODIFIED;
2156 	if (fattrflag != 0) {
2157 		NFSUNLOCKNODE(fdnp);
2158 		(void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, 0, 1);
2159 	} else {
2160 		fdnp->n_attrstamp = 0;
2161 		NFSUNLOCKNODE(fdnp);
2162 		KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
2163 	}
2164 	NFSLOCKNODE(tdnp);
2165 	tdnp->n_flag |= NMODIFIED;
2166 	if (tattrflag != 0) {
2167 		NFSUNLOCKNODE(tdnp);
2168 		(void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, 0, 1);
2169 	} else {
2170 		tdnp->n_attrstamp = 0;
2171 		NFSUNLOCKNODE(tdnp);
2172 		KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
2173 	}
2174 	if (error && NFS_ISV4(fdvp))
2175 		error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2176 	return (error);
2177 }
2178 
2179 /*
2180  * nfs hard link create call
2181  */
2182 static int
2183 nfs_link(struct vop_link_args *ap)
2184 {
2185 	struct vnode *vp = ap->a_vp;
2186 	struct vnode *tdvp = ap->a_tdvp;
2187 	struct componentname *cnp = ap->a_cnp;
2188 	struct nfsnode *np, *tdnp;
2189 	struct nfsvattr nfsva, dnfsva;
2190 	int error = 0, attrflag, dattrflag;
2191 
2192 	/*
2193 	 * Push all writes to the server, so that the attribute cache
2194 	 * doesn't get "out of sync" with the server.
2195 	 * XXX There should be a better way!
2196 	 */
2197 	VOP_FSYNC(vp, MNT_WAIT, curthread);
2198 
2199 	error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
2200 	    cnp->cn_cred, curthread, &dnfsva, &nfsva, &attrflag,
2201 	    &dattrflag, NULL);
2202 	tdnp = VTONFS(tdvp);
2203 	NFSLOCKNODE(tdnp);
2204 	tdnp->n_flag |= NMODIFIED;
2205 	if (dattrflag != 0) {
2206 		NFSUNLOCKNODE(tdnp);
2207 		(void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, 0, 1);
2208 	} else {
2209 		tdnp->n_attrstamp = 0;
2210 		NFSUNLOCKNODE(tdnp);
2211 		KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
2212 	}
2213 	if (attrflag)
2214 		(void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
2215 	else {
2216 		np = VTONFS(vp);
2217 		NFSLOCKNODE(np);
2218 		np->n_attrstamp = 0;
2219 		NFSUNLOCKNODE(np);
2220 		KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
2221 	}
2222 	/*
2223 	 * If negative lookup caching is enabled, I might as well
2224 	 * add an entry for this node. Not necessary for correctness,
2225 	 * but if negative caching is enabled, then the system
2226 	 * must care about lookup caching hit rate, so...
2227 	 */
2228 	if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
2229 	    (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2230 		if (tdvp != vp)
2231 			cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL);
2232 		else
2233 			printf("nfs_link: bogus NFS server returned "
2234 			    "the directory as the new link\n");
2235 	}
2236 	if (error && NFS_ISV4(vp))
2237 		error = nfscl_maperr(curthread, error, (uid_t)0,
2238 		    (gid_t)0);
2239 	return (error);
2240 }
2241 
2242 /*
2243  * nfs symbolic link create call
2244  */
2245 static int
2246 nfs_symlink(struct vop_symlink_args *ap)
2247 {
2248 	struct vnode *dvp = ap->a_dvp;
2249 	struct vattr *vap = ap->a_vap;
2250 	struct componentname *cnp = ap->a_cnp;
2251 	struct nfsvattr nfsva, dnfsva;
2252 	struct nfsfh *nfhp;
2253 	struct nfsnode *np = NULL, *dnp;
2254 	struct vnode *newvp = NULL;
2255 	int error = 0, attrflag, dattrflag, ret;
2256 
2257 	vap->va_type = VLNK;
2258 	error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2259 	    ap->a_target, vap, cnp->cn_cred, curthread, &dnfsva,
2260 	    &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
2261 	if (nfhp) {
2262 		ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread,
2263 		    &np, LK_EXCLUSIVE);
2264 		if (!ret)
2265 			newvp = NFSTOV(np);
2266 		else if (!error)
2267 			error = ret;
2268 	}
2269 	if (newvp != NULL) {
2270 		if (attrflag)
2271 			(void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
2272 	} else if (!error) {
2273 		/*
2274 		 * If we do not have an error and we could not extract the
2275 		 * newvp from the response due to the request being NFSv2, we
2276 		 * have to do a lookup in order to obtain a newvp to return.
2277 		 */
2278 		error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2279 		    cnp->cn_cred, curthread, &np);
2280 		if (!error)
2281 			newvp = NFSTOV(np);
2282 	}
2283 	if (error) {
2284 		if (newvp)
2285 			vput(newvp);
2286 		if (NFS_ISV4(dvp))
2287 			error = nfscl_maperr(curthread, error,
2288 			    vap->va_uid, vap->va_gid);
2289 	} else {
2290 		*ap->a_vpp = newvp;
2291 	}
2292 
2293 	dnp = VTONFS(dvp);
2294 	NFSLOCKNODE(dnp);
2295 	dnp->n_flag |= NMODIFIED;
2296 	if (dattrflag != 0) {
2297 		NFSUNLOCKNODE(dnp);
2298 		(void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
2299 	} else {
2300 		dnp->n_attrstamp = 0;
2301 		NFSUNLOCKNODE(dnp);
2302 		KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2303 	}
2304 	/*
2305 	 * If negative lookup caching is enabled, I might as well
2306 	 * add an entry for this node. Not necessary for correctness,
2307 	 * but if negative caching is enabled, then the system
2308 	 * must care about lookup caching hit rate, so...
2309 	 */
2310 	if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2311 	    (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2312 		if (dvp != newvp)
2313 			cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
2314 			    NULL);
2315 		else
2316 			printf("nfs_symlink: bogus NFS server returned "
2317 			    "the directory as the new file object\n");
2318 	}
2319 	return (error);
2320 }
2321 
2322 /*
2323  * nfs make dir call
2324  */
2325 static int
2326 nfs_mkdir(struct vop_mkdir_args *ap)
2327 {
2328 	struct vnode *dvp = ap->a_dvp;
2329 	struct vattr *vap = ap->a_vap;
2330 	struct componentname *cnp = ap->a_cnp;
2331 	struct nfsnode *np = NULL, *dnp;
2332 	struct vnode *newvp = NULL;
2333 	struct vattr vattr;
2334 	struct nfsfh *nfhp;
2335 	struct nfsvattr nfsva, dnfsva;
2336 	int error = 0, attrflag, dattrflag, ret;
2337 
2338 	if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
2339 		return (error);
2340 	vap->va_type = VDIR;
2341 	error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2342 	    vap, cnp->cn_cred, curthread, &dnfsva, &nfsva, &nfhp,
2343 	    &attrflag, &dattrflag, NULL);
2344 	dnp = VTONFS(dvp);
2345 	NFSLOCKNODE(dnp);
2346 	dnp->n_flag |= NMODIFIED;
2347 	if (dattrflag != 0) {
2348 		NFSUNLOCKNODE(dnp);
2349 		(void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
2350 	} else {
2351 		dnp->n_attrstamp = 0;
2352 		NFSUNLOCKNODE(dnp);
2353 		KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2354 	}
2355 	if (nfhp) {
2356 		ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread,
2357 		    &np, LK_EXCLUSIVE);
2358 		if (!ret) {
2359 			newvp = NFSTOV(np);
2360 			if (attrflag)
2361 			   (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
2362 				0, 1);
2363 		} else if (!error)
2364 			error = ret;
2365 	}
2366 	if (!error && newvp == NULL) {
2367 		error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2368 		    cnp->cn_cred, curthread, &np);
2369 		if (!error) {
2370 			newvp = NFSTOV(np);
2371 			if (newvp->v_type != VDIR)
2372 				error = EEXIST;
2373 		}
2374 	}
2375 	if (error) {
2376 		if (newvp)
2377 			vput(newvp);
2378 		if (NFS_ISV4(dvp))
2379 			error = nfscl_maperr(curthread, error,
2380 			    vap->va_uid, vap->va_gid);
2381 	} else {
2382 		/*
2383 		 * If negative lookup caching is enabled, I might as well
2384 		 * add an entry for this node. Not necessary for correctness,
2385 		 * but if negative caching is enabled, then the system
2386 		 * must care about lookup caching hit rate, so...
2387 		 */
2388 		if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2389 		    (cnp->cn_flags & MAKEENTRY) &&
2390 		    attrflag != 0 && dattrflag != 0) {
2391 			if (dvp != newvp)
2392 				cache_enter_time(dvp, newvp, cnp,
2393 				    &nfsva.na_ctime, &dnfsva.na_ctime);
2394 			else
2395 				printf("nfs_mkdir: bogus NFS server returned "
2396 				    "the directory that the directory was "
2397 				    "created in as the new file object\n");
2398 		}
2399 		*ap->a_vpp = newvp;
2400 	}
2401 	return (error);
2402 }
2403 
2404 /*
2405  * nfs remove directory call
2406  */
2407 static int
2408 nfs_rmdir(struct vop_rmdir_args *ap)
2409 {
2410 	struct vnode *vp = ap->a_vp;
2411 	struct vnode *dvp = ap->a_dvp;
2412 	struct componentname *cnp = ap->a_cnp;
2413 	struct nfsnode *dnp;
2414 	struct nfsvattr dnfsva;
2415 	int error, dattrflag;
2416 
2417 	if (dvp == vp)
2418 		return (EINVAL);
2419 	error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2420 	    cnp->cn_cred, curthread, &dnfsva, &dattrflag, NULL);
2421 	dnp = VTONFS(dvp);
2422 	NFSLOCKNODE(dnp);
2423 	dnp->n_flag |= NMODIFIED;
2424 	if (dattrflag != 0) {
2425 		NFSUNLOCKNODE(dnp);
2426 		(void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
2427 	} else {
2428 		dnp->n_attrstamp = 0;
2429 		NFSUNLOCKNODE(dnp);
2430 		KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2431 	}
2432 
2433 	cache_purge(dvp);
2434 	cache_purge(vp);
2435 	if (error && NFS_ISV4(dvp))
2436 		error = nfscl_maperr(curthread, error, (uid_t)0,
2437 		    (gid_t)0);
2438 	/*
2439 	 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
2440 	 */
2441 	if (error == ENOENT)
2442 		error = 0;
2443 	return (error);
2444 }
2445 
2446 /*
2447  * nfs readdir call
2448  */
2449 static int
2450 nfs_readdir(struct vop_readdir_args *ap)
2451 {
2452 	struct vnode *vp = ap->a_vp;
2453 	struct nfsnode *np = VTONFS(vp);
2454 	struct uio *uio = ap->a_uio;
2455 	ssize_t tresid, left;
2456 	int error = 0;
2457 	struct vattr vattr;
2458 
2459 	if (ap->a_eofflag != NULL)
2460 		*ap->a_eofflag = 0;
2461 	if (vp->v_type != VDIR)
2462 		return(EPERM);
2463 
2464 	/*
2465 	 * First, check for hit on the EOF offset cache
2466 	 */
2467 	NFSLOCKNODE(np);
2468 	if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
2469 	    (np->n_flag & NMODIFIED) == 0) {
2470 		NFSUNLOCKNODE(np);
2471 		if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
2472 			NFSLOCKNODE(np);
2473 			if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
2474 			    !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
2475 				NFSUNLOCKNODE(np);
2476 				NFSINCRGLOBAL(nfsstatsv1.direofcache_hits);
2477 				if (ap->a_eofflag != NULL)
2478 					*ap->a_eofflag = 1;
2479 				return (0);
2480 			} else
2481 				NFSUNLOCKNODE(np);
2482 		}
2483 	} else
2484 		NFSUNLOCKNODE(np);
2485 
2486 	/*
2487 	 * NFS always guarantees that directory entries don't straddle
2488 	 * DIRBLKSIZ boundaries.  As such, we need to limit the size
2489 	 * to an exact multiple of DIRBLKSIZ, to avoid copying a partial
2490 	 * directory entry.
2491 	 */
2492 	left = uio->uio_resid % DIRBLKSIZ;
2493 	if (left == uio->uio_resid)
2494 		return (EINVAL);
2495 	uio->uio_resid -= left;
2496 
2497 	/*
2498 	 * Call ncl_bioread() to do the real work.
2499 	 */
2500 	tresid = uio->uio_resid;
2501 	error = ncl_bioread(vp, uio, 0, ap->a_cred);
2502 
2503 	if (!error && uio->uio_resid == tresid) {
2504 		NFSINCRGLOBAL(nfsstatsv1.direofcache_misses);
2505 		if (ap->a_eofflag != NULL)
2506 			*ap->a_eofflag = 1;
2507 	}
2508 
2509 	/* Add the partial DIRBLKSIZ (left) back in. */
2510 	uio->uio_resid += left;
2511 	return (error);
2512 }
2513 
2514 /*
2515  * Readdir rpc call.
2516  * Called from below the buffer cache by ncl_doio().
2517  */
2518 int
2519 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2520     struct thread *td)
2521 {
2522 	struct nfsvattr nfsva;
2523 	nfsuint64 *cookiep, cookie;
2524 	struct nfsnode *dnp = VTONFS(vp);
2525 	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2526 	int error = 0, eof, attrflag;
2527 
2528 	KASSERT(uiop->uio_iovcnt == 1 &&
2529 	    (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2530 	    (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2531 	    ("nfs readdirrpc bad uio"));
2532 
2533 	/*
2534 	 * If there is no cookie, assume directory was stale.
2535 	 */
2536 	ncl_dircookie_lock(dnp);
2537 	NFSUNLOCKNODE(dnp);
2538 	cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2539 	if (cookiep) {
2540 		cookie = *cookiep;
2541 		ncl_dircookie_unlock(dnp);
2542 	} else {
2543 		ncl_dircookie_unlock(dnp);
2544 		return (NFSERR_BAD_COOKIE);
2545 	}
2546 
2547 	if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2548 		(void)ncl_fsinfo(nmp, vp, cred, td);
2549 
2550 	error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
2551 	    &attrflag, &eof, NULL);
2552 	if (attrflag)
2553 		(void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
2554 
2555 	if (!error) {
2556 		/*
2557 		 * We are now either at the end of the directory or have filled
2558 		 * the block.
2559 		 */
2560 		if (eof) {
2561 			NFSLOCKNODE(dnp);
2562 			dnp->n_direofoffset = uiop->uio_offset;
2563 			NFSUNLOCKNODE(dnp);
2564 		} else {
2565 			if (uiop->uio_resid > 0)
2566 				printf("EEK! readdirrpc resid > 0\n");
2567 			ncl_dircookie_lock(dnp);
2568 			NFSUNLOCKNODE(dnp);
2569 			cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2570 			*cookiep = cookie;
2571 			ncl_dircookie_unlock(dnp);
2572 		}
2573 	} else if (NFS_ISV4(vp)) {
2574 		error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2575 	}
2576 	return (error);
2577 }
2578 
2579 /*
2580  * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
2581  */
2582 int
2583 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2584     struct thread *td)
2585 {
2586 	struct nfsvattr nfsva;
2587 	nfsuint64 *cookiep, cookie;
2588 	struct nfsnode *dnp = VTONFS(vp);
2589 	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2590 	int error = 0, attrflag, eof;
2591 
2592 	KASSERT(uiop->uio_iovcnt == 1 &&
2593 	    (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2594 	    (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2595 	    ("nfs readdirplusrpc bad uio"));
2596 
2597 	/*
2598 	 * If there is no cookie, assume directory was stale.
2599 	 */
2600 	ncl_dircookie_lock(dnp);
2601 	NFSUNLOCKNODE(dnp);
2602 	cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2603 	if (cookiep) {
2604 		cookie = *cookiep;
2605 		ncl_dircookie_unlock(dnp);
2606 	} else {
2607 		ncl_dircookie_unlock(dnp);
2608 		return (NFSERR_BAD_COOKIE);
2609 	}
2610 
2611 	if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2612 		(void)ncl_fsinfo(nmp, vp, cred, td);
2613 	error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
2614 	    &attrflag, &eof, NULL);
2615 	if (attrflag)
2616 		(void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
2617 
2618 	if (!error) {
2619 		/*
2620 		 * We are now either at end of the directory or have filled the
2621 		 * the block.
2622 		 */
2623 		if (eof) {
2624 			NFSLOCKNODE(dnp);
2625 			dnp->n_direofoffset = uiop->uio_offset;
2626 			NFSUNLOCKNODE(dnp);
2627 		} else {
2628 			if (uiop->uio_resid > 0)
2629 				printf("EEK! readdirplusrpc resid > 0\n");
2630 			ncl_dircookie_lock(dnp);
2631 			NFSUNLOCKNODE(dnp);
2632 			cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2633 			*cookiep = cookie;
2634 			ncl_dircookie_unlock(dnp);
2635 		}
2636 	} else if (NFS_ISV4(vp)) {
2637 		error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2638 	}
2639 	return (error);
2640 }
2641 
2642 /*
2643  * Silly rename. To make the NFS filesystem that is stateless look a little
2644  * more like the "ufs" a remove of an active vnode is translated to a rename
2645  * to a funny looking filename that is removed by nfs_inactive on the
2646  * nfsnode. There is the potential for another process on a different client
2647  * to create the same funny name between the nfs_lookitup() fails and the
2648  * nfs_rename() completes, but...
2649  */
2650 static int
2651 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
2652 {
2653 	struct sillyrename *sp;
2654 	struct nfsnode *np;
2655 	int error;
2656 	short pid;
2657 	unsigned int lticks;
2658 
2659 	cache_purge(dvp);
2660 	np = VTONFS(vp);
2661 	KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
2662 	sp = malloc(sizeof (struct sillyrename),
2663 	    M_NEWNFSREQ, M_WAITOK);
2664 	sp->s_cred = crhold(cnp->cn_cred);
2665 	sp->s_dvp = dvp;
2666 	VREF(dvp);
2667 
2668 	/*
2669 	 * Fudge together a funny name.
2670 	 * Changing the format of the funny name to accommodate more
2671 	 * sillynames per directory.
2672 	 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is
2673 	 * CPU ticks since boot.
2674 	 */
2675 	pid = curthread->td_proc->p_pid;
2676 	lticks = (unsigned int)ticks;
2677 	for ( ; ; ) {
2678 		sp->s_namlen = sprintf(sp->s_name,
2679 				       ".nfs.%08x.%04x4.4", lticks,
2680 				       pid);
2681 		if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2682 				 curthread, NULL))
2683 			break;
2684 		lticks++;
2685 	}
2686 	error = nfs_renameit(dvp, vp, cnp, sp);
2687 	if (error)
2688 		goto bad;
2689 	error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2690 		curthread, &np);
2691 	np->n_sillyrename = sp;
2692 	return (0);
2693 bad:
2694 	vrele(sp->s_dvp);
2695 	crfree(sp->s_cred);
2696 	free(sp, M_NEWNFSREQ);
2697 	return (error);
2698 }
2699 
2700 /*
2701  * Look up a file name and optionally either update the file handle or
2702  * allocate an nfsnode, depending on the value of npp.
2703  * npp == NULL	--> just do the lookup
2704  * *npp == NULL --> allocate a new nfsnode and make sure attributes are
2705  *			handled too
2706  * *npp != NULL --> update the file handle in the vnode
2707  */
2708 static int
2709 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
2710     struct thread *td, struct nfsnode **npp)
2711 {
2712 	struct vnode *newvp = NULL, *vp;
2713 	struct nfsnode *np, *dnp = VTONFS(dvp);
2714 	struct nfsfh *nfhp, *onfhp;
2715 	struct nfsvattr nfsva, dnfsva;
2716 	struct componentname cn;
2717 	int error = 0, attrflag, dattrflag;
2718 	u_int hash;
2719 	struct timespec ts;
2720 
2721 	nanouptime(&ts);
2722 	error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
2723 	    &nfhp, &attrflag, &dattrflag, NULL, 0);
2724 	if (dattrflag)
2725 		(void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
2726 	if (npp && !error) {
2727 		if (*npp != NULL) {
2728 		    np = *npp;
2729 		    vp = NFSTOV(np);
2730 		    /*
2731 		     * For NFSv4, check to see if it is the same name and
2732 		     * replace the name, if it is different.
2733 		     */
2734 		    if (np->n_v4 != NULL && nfsva.na_type == VREG &&
2735 			(np->n_v4->n4_namelen != len ||
2736 			 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
2737 			 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
2738 			 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2739 			 dnp->n_fhp->nfh_len))) {
2740 #ifdef notdef
2741 { char nnn[100]; int nnnl;
2742 nnnl = (len < 100) ? len : 99;
2743 bcopy(name, nnn, nnnl);
2744 nnn[nnnl] = '\0';
2745 printf("replace=%s\n",nnn);
2746 }
2747 #endif
2748 			    free(np->n_v4, M_NFSV4NODE);
2749 			    np->n_v4 = malloc(
2750 				sizeof (struct nfsv4node) +
2751 				dnp->n_fhp->nfh_len + len - 1,
2752 				M_NFSV4NODE, M_WAITOK);
2753 			    np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
2754 			    np->n_v4->n4_namelen = len;
2755 			    NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2756 				dnp->n_fhp->nfh_len);
2757 			    NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
2758 		    }
2759 		    hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
2760 			FNV1_32_INIT);
2761 		    onfhp = np->n_fhp;
2762 		    /*
2763 		     * Rehash node for new file handle.
2764 		     */
2765 		    vfs_hash_rehash(vp, hash);
2766 		    np->n_fhp = nfhp;
2767 		    if (onfhp != NULL)
2768 			free(onfhp, M_NFSFH);
2769 		    newvp = NFSTOV(np);
2770 		} else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
2771 		    free(nfhp, M_NFSFH);
2772 		    VREF(dvp);
2773 		    newvp = dvp;
2774 		} else {
2775 		    cn.cn_nameptr = name;
2776 		    cn.cn_namelen = len;
2777 		    error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
2778 			&np, LK_EXCLUSIVE);
2779 		    if (error)
2780 			return (error);
2781 		    newvp = NFSTOV(np);
2782 		    /*
2783 		     * If n_localmodtime >= time before RPC, then
2784 		     * a file modification operation, such as
2785 		     * VOP_SETATTR() of size, has occurred while
2786 		     * the Lookup RPC and acquisition of the vnode
2787 		     * happened.  As such, the attributes might
2788 		     * be stale, with possibly an incorrect size.
2789 		     */
2790 		    NFSLOCKNODE(np);
2791 		    if (timespecisset(&np->n_localmodtime) &&
2792 			timespeccmp(&np->n_localmodtime, &ts, >=)) {
2793 			NFSCL_DEBUG(4, "nfs_lookitup: localmod "
2794 			    "stale attributes\n");
2795 			attrflag = 0;
2796 		    }
2797 		    NFSUNLOCKNODE(np);
2798 		}
2799 		if (!attrflag && *npp == NULL) {
2800 			if (newvp == dvp)
2801 				vrele(newvp);
2802 			else
2803 				vput(newvp);
2804 			return (ENOENT);
2805 		}
2806 		if (attrflag)
2807 			(void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
2808 	}
2809 	if (npp && *npp == NULL) {
2810 		if (error) {
2811 			if (newvp) {
2812 				if (newvp == dvp)
2813 					vrele(newvp);
2814 				else
2815 					vput(newvp);
2816 			}
2817 		} else
2818 			*npp = np;
2819 	}
2820 	if (error && NFS_ISV4(dvp))
2821 		error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2822 	return (error);
2823 }
2824 
2825 /*
2826  * Nfs Version 3 and 4 commit rpc
2827  */
2828 int
2829 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
2830    struct thread *td)
2831 {
2832 	struct nfsvattr nfsva;
2833 	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2834 	struct nfsnode *np;
2835 	struct uio uio;
2836 	int error, attrflag;
2837 
2838 	np = VTONFS(vp);
2839 	error = EIO;
2840 	attrflag = 0;
2841 	if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) {
2842 		uio.uio_offset = offset;
2843 		uio.uio_resid = cnt;
2844 		error = nfscl_doiods(vp, &uio, NULL, NULL,
2845 		    NFSV4OPEN_ACCESSWRITE, 1, cred, td);
2846 		if (error != 0) {
2847 			NFSLOCKNODE(np);
2848 			np->n_flag &= ~NDSCOMMIT;
2849 			NFSUNLOCKNODE(np);
2850 		}
2851 	}
2852 	if (error != 0) {
2853 		mtx_lock(&nmp->nm_mtx);
2854 		if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
2855 			mtx_unlock(&nmp->nm_mtx);
2856 			return (0);
2857 		}
2858 		mtx_unlock(&nmp->nm_mtx);
2859 		error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva,
2860 		    &attrflag, NULL);
2861 	}
2862 	if (attrflag != 0)
2863 		(void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
2864 	if (error != 0 && NFS_ISV4(vp))
2865 		error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2866 	return (error);
2867 }
2868 
2869 /*
2870  * Strategy routine.
2871  * For async requests when nfsiod(s) are running, queue the request by
2872  * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
2873  * request.
2874  */
2875 static int
2876 nfs_strategy(struct vop_strategy_args *ap)
2877 {
2878 	struct buf *bp;
2879 	struct vnode *vp;
2880 	struct ucred *cr;
2881 
2882 	bp = ap->a_bp;
2883 	vp = ap->a_vp;
2884 	KASSERT(bp->b_vp == vp, ("missing b_getvp"));
2885 	KASSERT(!(bp->b_flags & B_DONE),
2886 	    ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
2887 
2888 	if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno)
2889 		bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize /
2890 		    DEV_BSIZE);
2891 	if (bp->b_iocmd == BIO_READ)
2892 		cr = bp->b_rcred;
2893 	else
2894 		cr = bp->b_wcred;
2895 
2896 	/*
2897 	 * If the op is asynchronous and an i/o daemon is waiting
2898 	 * queue the request, wake it up and wait for completion
2899 	 * otherwise just do it ourselves.
2900 	 */
2901 	if ((bp->b_flags & B_ASYNC) == 0 ||
2902 	    ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread))
2903 		(void) ncl_doio(vp, bp, cr, curthread, 1);
2904 	return (0);
2905 }
2906 
2907 /*
2908  * fsync vnode op. Just call ncl_flush() with commit == 1.
2909  */
2910 /* ARGSUSED */
2911 static int
2912 nfs_fsync(struct vop_fsync_args *ap)
2913 {
2914 
2915 	if (ap->a_vp->v_type != VREG) {
2916 		/*
2917 		 * For NFS, metadata is changed synchronously on the server,
2918 		 * so there is nothing to flush. Also, ncl_flush() clears
2919 		 * the NMODIFIED flag and that shouldn't be done here for
2920 		 * directories.
2921 		 */
2922 		return (0);
2923 	}
2924 	return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0));
2925 }
2926 
2927 /*
2928  * Flush all the blocks associated with a vnode.
2929  * 	Walk through the buffer pool and push any dirty pages
2930  *	associated with the vnode.
2931  * If the called_from_renewthread argument is TRUE, it has been called
2932  * from the NFSv4 renew thread and, as such, cannot block indefinitely
2933  * waiting for a buffer write to complete.
2934  */
2935 int
2936 ncl_flush(struct vnode *vp, int waitfor, struct thread *td,
2937     int commit, int called_from_renewthread)
2938 {
2939 	struct nfsnode *np = VTONFS(vp);
2940 	struct buf *bp;
2941 	int i;
2942 	struct buf *nbp;
2943 	struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2944 	int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
2945 	int passone = 1, trycnt = 0;
2946 	u_quad_t off, endoff, toff;
2947 	struct ucred* wcred = NULL;
2948 	struct buf **bvec = NULL;
2949 	struct bufobj *bo;
2950 #ifndef NFS_COMMITBVECSIZ
2951 #define	NFS_COMMITBVECSIZ	20
2952 #endif
2953 	struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
2954 	u_int bvecsize = 0, bveccount;
2955 	struct timespec ts;
2956 
2957 	if (called_from_renewthread != 0)
2958 		slptimeo = hz;
2959 	if (nmp->nm_flag & NFSMNT_INT)
2960 		slpflag = PCATCH;
2961 	if (!commit)
2962 		passone = 0;
2963 	bo = &vp->v_bufobj;
2964 	/*
2965 	 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
2966 	 * server, but has not been committed to stable storage on the server
2967 	 * yet. On the first pass, the byte range is worked out and the commit
2968 	 * rpc is done. On the second pass, ncl_writebp() is called to do the
2969 	 * job.
2970 	 */
2971 again:
2972 	off = (u_quad_t)-1;
2973 	endoff = 0;
2974 	bvecpos = 0;
2975 	if (NFS_ISV34(vp) && commit) {
2976 		if (bvec != NULL && bvec != bvec_on_stack)
2977 			free(bvec, M_TEMP);
2978 		/*
2979 		 * Count up how many buffers waiting for a commit.
2980 		 */
2981 		bveccount = 0;
2982 		BO_LOCK(bo);
2983 		TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2984 			if (!BUF_ISLOCKED(bp) &&
2985 			    (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
2986 				== (B_DELWRI | B_NEEDCOMMIT))
2987 				bveccount++;
2988 		}
2989 		/*
2990 		 * Allocate space to remember the list of bufs to commit.  It is
2991 		 * important to use M_NOWAIT here to avoid a race with nfs_write.
2992 		 * If we can't get memory (for whatever reason), we will end up
2993 		 * committing the buffers one-by-one in the loop below.
2994 		 */
2995 		if (bveccount > NFS_COMMITBVECSIZ) {
2996 			/*
2997 			 * Release the vnode interlock to avoid a lock
2998 			 * order reversal.
2999 			 */
3000 			BO_UNLOCK(bo);
3001 			bvec = (struct buf **)
3002 				malloc(bveccount * sizeof(struct buf *),
3003 				       M_TEMP, M_NOWAIT);
3004 			BO_LOCK(bo);
3005 			if (bvec == NULL) {
3006 				bvec = bvec_on_stack;
3007 				bvecsize = NFS_COMMITBVECSIZ;
3008 			} else
3009 				bvecsize = bveccount;
3010 		} else {
3011 			bvec = bvec_on_stack;
3012 			bvecsize = NFS_COMMITBVECSIZ;
3013 		}
3014 		TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
3015 			if (bvecpos >= bvecsize)
3016 				break;
3017 			if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
3018 				nbp = TAILQ_NEXT(bp, b_bobufs);
3019 				continue;
3020 			}
3021 			if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
3022 			    (B_DELWRI | B_NEEDCOMMIT)) {
3023 				BUF_UNLOCK(bp);
3024 				nbp = TAILQ_NEXT(bp, b_bobufs);
3025 				continue;
3026 			}
3027 			BO_UNLOCK(bo);
3028 			bremfree(bp);
3029 			/*
3030 			 * Work out if all buffers are using the same cred
3031 			 * so we can deal with them all with one commit.
3032 			 *
3033 			 * NOTE: we are not clearing B_DONE here, so we have
3034 			 * to do it later on in this routine if we intend to
3035 			 * initiate I/O on the bp.
3036 			 *
3037 			 * Note: to avoid loopback deadlocks, we do not
3038 			 * assign b_runningbufspace.
3039 			 */
3040 			if (wcred == NULL)
3041 				wcred = bp->b_wcred;
3042 			else if (wcred != bp->b_wcred)
3043 				wcred = NOCRED;
3044 			vfs_busy_pages(bp, 1);
3045 
3046 			BO_LOCK(bo);
3047 			/*
3048 			 * bp is protected by being locked, but nbp is not
3049 			 * and vfs_busy_pages() may sleep.  We have to
3050 			 * recalculate nbp.
3051 			 */
3052 			nbp = TAILQ_NEXT(bp, b_bobufs);
3053 
3054 			/*
3055 			 * A list of these buffers is kept so that the
3056 			 * second loop knows which buffers have actually
3057 			 * been committed. This is necessary, since there
3058 			 * may be a race between the commit rpc and new
3059 			 * uncommitted writes on the file.
3060 			 */
3061 			bvec[bvecpos++] = bp;
3062 			toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
3063 				bp->b_dirtyoff;
3064 			if (toff < off)
3065 				off = toff;
3066 			toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
3067 			if (toff > endoff)
3068 				endoff = toff;
3069 		}
3070 		BO_UNLOCK(bo);
3071 	}
3072 	if (bvecpos > 0) {
3073 		/*
3074 		 * Commit data on the server, as required.
3075 		 * If all bufs are using the same wcred, then use that with
3076 		 * one call for all of them, otherwise commit each one
3077 		 * separately.
3078 		 */
3079 		if (wcred != NOCRED)
3080 			retv = ncl_commit(vp, off, (int)(endoff - off),
3081 					  wcred, td);
3082 		else {
3083 			retv = 0;
3084 			for (i = 0; i < bvecpos; i++) {
3085 				off_t off, size;
3086 				bp = bvec[i];
3087 				off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
3088 					bp->b_dirtyoff;
3089 				size = (u_quad_t)(bp->b_dirtyend
3090 						  - bp->b_dirtyoff);
3091 				retv = ncl_commit(vp, off, (int)size,
3092 						  bp->b_wcred, td);
3093 				if (retv) break;
3094 			}
3095 		}
3096 
3097 		if (retv == NFSERR_STALEWRITEVERF)
3098 			ncl_clearcommit(vp->v_mount);
3099 
3100 		/*
3101 		 * Now, either mark the blocks I/O done or mark the
3102 		 * blocks dirty, depending on whether the commit
3103 		 * succeeded.
3104 		 */
3105 		for (i = 0; i < bvecpos; i++) {
3106 			bp = bvec[i];
3107 			bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
3108 			if (!NFSCL_FORCEDISM(vp->v_mount) && retv) {
3109 				/*
3110 				 * Error, leave B_DELWRI intact
3111 				 */
3112 				vfs_unbusy_pages(bp);
3113 				brelse(bp);
3114 			} else {
3115 				/*
3116 				 * Success, remove B_DELWRI ( bundirty() ).
3117 				 *
3118 				 * b_dirtyoff/b_dirtyend seem to be NFS
3119 				 * specific.  We should probably move that
3120 				 * into bundirty(). XXX
3121 				 */
3122 				bufobj_wref(bo);
3123 				bp->b_flags |= B_ASYNC;
3124 				bundirty(bp);
3125 				bp->b_flags &= ~B_DONE;
3126 				bp->b_ioflags &= ~BIO_ERROR;
3127 				bp->b_dirtyoff = bp->b_dirtyend = 0;
3128 				bufdone(bp);
3129 			}
3130 		}
3131 	}
3132 
3133 	/*
3134 	 * Start/do any write(s) that are required.
3135 	 */
3136 loop:
3137 	BO_LOCK(bo);
3138 	TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
3139 		if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
3140 			if (waitfor != MNT_WAIT || passone)
3141 				continue;
3142 
3143 			error = BUF_TIMELOCK(bp,
3144 			    LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
3145 			    BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo);
3146 			if (error == 0) {
3147 				BUF_UNLOCK(bp);
3148 				goto loop;
3149 			}
3150 			if (error == ENOLCK) {
3151 				error = 0;
3152 				goto loop;
3153 			}
3154 			if (called_from_renewthread != 0) {
3155 				/*
3156 				 * Return EIO so the flush will be retried
3157 				 * later.
3158 				 */
3159 				error = EIO;
3160 				goto done;
3161 			}
3162 			if (newnfs_sigintr(nmp, td)) {
3163 				error = EINTR;
3164 				goto done;
3165 			}
3166 			if (slpflag == PCATCH) {
3167 				slpflag = 0;
3168 				slptimeo = 2 * hz;
3169 			}
3170 			goto loop;
3171 		}
3172 		if ((bp->b_flags & B_DELWRI) == 0)
3173 			panic("nfs_fsync: not dirty");
3174 		if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
3175 			BUF_UNLOCK(bp);
3176 			continue;
3177 		}
3178 		BO_UNLOCK(bo);
3179 		bremfree(bp);
3180 		bp->b_flags |= B_ASYNC;
3181 		bwrite(bp);
3182 		if (newnfs_sigintr(nmp, td)) {
3183 			error = EINTR;
3184 			goto done;
3185 		}
3186 		goto loop;
3187 	}
3188 	if (passone) {
3189 		passone = 0;
3190 		BO_UNLOCK(bo);
3191 		goto again;
3192 	}
3193 	if (waitfor == MNT_WAIT) {
3194 		while (bo->bo_numoutput) {
3195 			error = bufobj_wwait(bo, slpflag, slptimeo);
3196 			if (error) {
3197 			    BO_UNLOCK(bo);
3198 			    if (called_from_renewthread != 0) {
3199 				/*
3200 				 * Return EIO so that the flush will be
3201 				 * retried later.
3202 				 */
3203 				error = EIO;
3204 				goto done;
3205 			    }
3206 			    error = newnfs_sigintr(nmp, td);
3207 			    if (error)
3208 				goto done;
3209 			    if (slpflag == PCATCH) {
3210 				slpflag = 0;
3211 				slptimeo = 2 * hz;
3212 			    }
3213 			    BO_LOCK(bo);
3214 			}
3215 		}
3216 		if (bo->bo_dirty.bv_cnt != 0 && commit) {
3217 			BO_UNLOCK(bo);
3218 			goto loop;
3219 		}
3220 		/*
3221 		 * Wait for all the async IO requests to drain
3222 		 */
3223 		BO_UNLOCK(bo);
3224 		NFSLOCKNODE(np);
3225 		while (np->n_directio_asyncwr > 0) {
3226 			np->n_flag |= NFSYNCWAIT;
3227 			error = newnfs_msleep(td, &np->n_directio_asyncwr,
3228 			    &np->n_mtx, slpflag | (PRIBIO + 1),
3229 			    "nfsfsync", 0);
3230 			if (error) {
3231 				if (newnfs_sigintr(nmp, td)) {
3232 					NFSUNLOCKNODE(np);
3233 					error = EINTR;
3234 					goto done;
3235 				}
3236 			}
3237 		}
3238 		NFSUNLOCKNODE(np);
3239 	} else
3240 		BO_UNLOCK(bo);
3241 	if (NFSHASPNFS(nmp)) {
3242 		nfscl_layoutcommit(vp, td);
3243 		/*
3244 		 * Invalidate the attribute cache, since writes to a DS
3245 		 * won't update the size attribute.
3246 		 */
3247 		NFSLOCKNODE(np);
3248 		np->n_attrstamp = 0;
3249 	} else
3250 		NFSLOCKNODE(np);
3251 	if (np->n_flag & NWRITEERR) {
3252 		error = np->n_error;
3253 		np->n_flag &= ~NWRITEERR;
3254 	}
3255   	if (commit && bo->bo_dirty.bv_cnt == 0 &&
3256 	    bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
3257   		np->n_flag &= ~NMODIFIED;
3258 	NFSUNLOCKNODE(np);
3259 done:
3260 	if (bvec != NULL && bvec != bvec_on_stack)
3261 		free(bvec, M_TEMP);
3262 	if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
3263 	    (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 ||
3264 	    np->n_directio_asyncwr != 0)) {
3265 		if (trycnt++ < 5) {
3266 			/* try, try again... */
3267 			passone = 1;
3268 			wcred = NULL;
3269 			bvec = NULL;
3270 			bvecsize = 0;
3271 			goto again;
3272 		}
3273 		vn_printf(vp, "ncl_flush failed");
3274 		error = called_from_renewthread != 0 ? EIO : EBUSY;
3275 	}
3276 	if (error == 0) {
3277 		nanouptime(&ts);
3278 		NFSLOCKNODE(np);
3279 		np->n_localmodtime = ts;
3280 		NFSUNLOCKNODE(np);
3281 	}
3282 	return (error);
3283 }
3284 
3285 /*
3286  * NFS advisory byte-level locks.
3287  */
3288 static int
3289 nfs_advlock(struct vop_advlock_args *ap)
3290 {
3291 	struct vnode *vp = ap->a_vp;
3292 	struct ucred *cred;
3293 	struct nfsnode *np = VTONFS(ap->a_vp);
3294 	struct proc *p = (struct proc *)ap->a_id;
3295 	struct thread *td = curthread;	/* XXX */
3296 	struct vattr va;
3297 	int ret, error;
3298 	u_quad_t size;
3299 	struct nfsmount *nmp;
3300 
3301 	error = NFSVOPLOCK(vp, LK_SHARED);
3302 	if (error != 0)
3303 		return (EBADF);
3304 	if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
3305 		if (vp->v_type != VREG) {
3306 			error = EINVAL;
3307 			goto out;
3308 		}
3309 		if ((ap->a_flags & F_POSIX) != 0)
3310 			cred = p->p_ucred;
3311 		else
3312 			cred = td->td_ucred;
3313 		NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
3314 		if (VN_IS_DOOMED(vp)) {
3315 			error = EBADF;
3316 			goto out;
3317 		}
3318 
3319 		/*
3320 		 * If this is unlocking a write locked region, flush and
3321 		 * commit them before unlocking. This is required by
3322 		 * RFC3530 Sec. 9.3.2.
3323 		 */
3324 		if (ap->a_op == F_UNLCK &&
3325 		    nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
3326 		    ap->a_flags))
3327 			(void) ncl_flush(vp, MNT_WAIT, td, 1, 0);
3328 
3329 		/*
3330 		 * Mark NFS node as might have acquired a lock.
3331 		 * This is separate from NHASBEENLOCKED, because it must
3332 		 * be done before the nfsrpc_advlock() call, which might
3333 		 * add a nfscllock structure to the client state.
3334 		 * It is used to check for the case where a nfscllock
3335 		 * state structure cannot exist for the file.
3336 		 * Only done for "oneopenown" NFSv4.1/4.2 mounts.
3337 		 */
3338 		nmp = VFSTONFS(vp->v_mount);
3339 		if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp)) {
3340 			NFSLOCKNODE(np);
3341 			np->n_flag |= NMIGHTBELOCKED;
3342 			NFSUNLOCKNODE(np);
3343 		}
3344 
3345 		/*
3346 		 * Loop around doing the lock op, while a blocking lock
3347 		 * must wait for the lock op to succeed.
3348 		 */
3349 		do {
3350 			ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
3351 			    ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
3352 			if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3353 			    ap->a_op == F_SETLK) {
3354 				NFSVOPUNLOCK(vp);
3355 				error = nfs_catnap(PZERO | PCATCH, ret,
3356 				    "ncladvl");
3357 				if (error)
3358 					return (EINTR);
3359 				NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
3360 				if (VN_IS_DOOMED(vp)) {
3361 					error = EBADF;
3362 					goto out;
3363 				}
3364 			}
3365 		} while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3366 		     ap->a_op == F_SETLK);
3367 		if (ret == NFSERR_DENIED) {
3368 			error = EAGAIN;
3369 			goto out;
3370 		} else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
3371 			error = ret;
3372 			goto out;
3373 		} else if (ret != 0) {
3374 			error = EACCES;
3375 			goto out;
3376 		}
3377 
3378 		/*
3379 		 * Now, if we just got a lock, invalidate data in the buffer
3380 		 * cache, as required, so that the coherency conforms with
3381 		 * RFC3530 Sec. 9.3.2.
3382 		 */
3383 		if (ap->a_op == F_SETLK) {
3384 			if ((np->n_flag & NMODIFIED) == 0) {
3385 				np->n_attrstamp = 0;
3386 				KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3387 				ret = VOP_GETATTR(vp, &va, cred);
3388 			}
3389 			if ((np->n_flag & NMODIFIED) || ret ||
3390 			    np->n_change != va.va_filerev) {
3391 				(void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
3392 				np->n_attrstamp = 0;
3393 				KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3394 				ret = VOP_GETATTR(vp, &va, cred);
3395 				if (!ret) {
3396 					np->n_mtime = va.va_mtime;
3397 					np->n_change = va.va_filerev;
3398 				}
3399 			}
3400 			/* Mark that a file lock has been acquired. */
3401 			NFSLOCKNODE(np);
3402 			np->n_flag |= NHASBEENLOCKED;
3403 			NFSUNLOCKNODE(np);
3404 		}
3405 	} else if (!NFS_ISV4(vp)) {
3406 		if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
3407 			size = VTONFS(vp)->n_size;
3408 			NFSVOPUNLOCK(vp);
3409 			error = lf_advlock(ap, &(vp->v_lockf), size);
3410 		} else {
3411 			if (nfs_advlock_p != NULL)
3412 				error = nfs_advlock_p(ap);
3413 			else {
3414 				NFSVOPUNLOCK(vp);
3415 				error = ENOLCK;
3416 			}
3417 		}
3418 		if (error == 0 && ap->a_op == F_SETLK) {
3419 			error = NFSVOPLOCK(vp, LK_SHARED);
3420 			if (error == 0) {
3421 				/* Mark that a file lock has been acquired. */
3422 				NFSLOCKNODE(np);
3423 				np->n_flag |= NHASBEENLOCKED;
3424 				NFSUNLOCKNODE(np);
3425 				NFSVOPUNLOCK(vp);
3426 			}
3427 		}
3428 		return (error);
3429 	} else
3430 		error = EOPNOTSUPP;
3431 out:
3432 	NFSVOPUNLOCK(vp);
3433 	return (error);
3434 }
3435 
3436 /*
3437  * NFS advisory byte-level locks.
3438  */
3439 static int
3440 nfs_advlockasync(struct vop_advlockasync_args *ap)
3441 {
3442 	struct vnode *vp = ap->a_vp;
3443 	u_quad_t size;
3444 	int error;
3445 
3446 	if (NFS_ISV4(vp))
3447 		return (EOPNOTSUPP);
3448 	error = NFSVOPLOCK(vp, LK_SHARED);
3449 	if (error)
3450 		return (error);
3451 	if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
3452 		size = VTONFS(vp)->n_size;
3453 		NFSVOPUNLOCK(vp);
3454 		error = lf_advlockasync(ap, &(vp->v_lockf), size);
3455 	} else {
3456 		NFSVOPUNLOCK(vp);
3457 		error = EOPNOTSUPP;
3458 	}
3459 	return (error);
3460 }
3461 
3462 /*
3463  * Print out the contents of an nfsnode.
3464  */
3465 static int
3466 nfs_print(struct vop_print_args *ap)
3467 {
3468 	struct vnode *vp = ap->a_vp;
3469 	struct nfsnode *np = VTONFS(vp);
3470 
3471 	printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid,
3472 	    (uintmax_t)np->n_vattr.na_fsid);
3473 	if (vp->v_type == VFIFO)
3474 		fifo_printinfo(vp);
3475 	printf("\n");
3476 	return (0);
3477 }
3478 
3479 /*
3480  * This is the "real" nfs::bwrite(struct buf*).
3481  * We set B_CACHE if this is a VMIO buffer.
3482  */
3483 int
3484 ncl_writebp(struct buf *bp, int force __unused, struct thread *td)
3485 {
3486 	int oldflags, rtval;
3487 
3488 	if (bp->b_flags & B_INVAL) {
3489 		brelse(bp);
3490 		return (0);
3491 	}
3492 
3493 	oldflags = bp->b_flags;
3494 	bp->b_flags |= B_CACHE;
3495 
3496 	/*
3497 	 * Undirty the bp.  We will redirty it later if the I/O fails.
3498 	 */
3499 	bundirty(bp);
3500 	bp->b_flags &= ~B_DONE;
3501 	bp->b_ioflags &= ~BIO_ERROR;
3502 	bp->b_iocmd = BIO_WRITE;
3503 
3504 	bufobj_wref(bp->b_bufobj);
3505 	curthread->td_ru.ru_oublock++;
3506 
3507 	/*
3508 	 * Note: to avoid loopback deadlocks, we do not
3509 	 * assign b_runningbufspace.
3510 	 */
3511 	vfs_busy_pages(bp, 1);
3512 
3513 	BUF_KERNPROC(bp);
3514 	bp->b_iooffset = dbtob(bp->b_blkno);
3515 	bstrategy(bp);
3516 
3517 	if ((oldflags & B_ASYNC) != 0)
3518 		return (0);
3519 
3520 	rtval = bufwait(bp);
3521 	if (oldflags & B_DELWRI)
3522 		reassignbuf(bp);
3523 	brelse(bp);
3524 	return (rtval);
3525 }
3526 
3527 /*
3528  * nfs special file access vnode op.
3529  * Essentially just get vattr and then imitate iaccess() since the device is
3530  * local to the client.
3531  */
3532 static int
3533 nfsspec_access(struct vop_access_args *ap)
3534 {
3535 	struct vattr *vap;
3536 	struct ucred *cred = ap->a_cred;
3537 	struct vnode *vp = ap->a_vp;
3538 	accmode_t accmode = ap->a_accmode;
3539 	struct vattr vattr;
3540 	int error;
3541 
3542 	/*
3543 	 * Disallow write attempts on filesystems mounted read-only;
3544 	 * unless the file is a socket, fifo, or a block or character
3545 	 * device resident on the filesystem.
3546 	 */
3547 	if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
3548 		switch (vp->v_type) {
3549 		case VREG:
3550 		case VDIR:
3551 		case VLNK:
3552 			return (EROFS);
3553 		default:
3554 			break;
3555 		}
3556 	}
3557 	vap = &vattr;
3558 	error = VOP_GETATTR(vp, vap, cred);
3559 	if (error)
3560 		goto out;
3561 	error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
3562 	    accmode, cred);
3563 out:
3564 	return error;
3565 }
3566 
3567 /*
3568  * Read wrapper for fifos.
3569  */
3570 static int
3571 nfsfifo_read(struct vop_read_args *ap)
3572 {
3573 	struct nfsnode *np = VTONFS(ap->a_vp);
3574 	int error;
3575 
3576 	/*
3577 	 * Set access flag.
3578 	 */
3579 	NFSLOCKNODE(np);
3580 	np->n_flag |= NACC;
3581 	vfs_timestamp(&np->n_atim);
3582 	NFSUNLOCKNODE(np);
3583 	error = fifo_specops.vop_read(ap);
3584 	return error;
3585 }
3586 
3587 /*
3588  * Write wrapper for fifos.
3589  */
3590 static int
3591 nfsfifo_write(struct vop_write_args *ap)
3592 {
3593 	struct nfsnode *np = VTONFS(ap->a_vp);
3594 
3595 	/*
3596 	 * Set update flag.
3597 	 */
3598 	NFSLOCKNODE(np);
3599 	np->n_flag |= NUPD;
3600 	vfs_timestamp(&np->n_mtim);
3601 	NFSUNLOCKNODE(np);
3602 	return(fifo_specops.vop_write(ap));
3603 }
3604 
3605 /*
3606  * Close wrapper for fifos.
3607  *
3608  * Update the times on the nfsnode then do fifo close.
3609  */
3610 static int
3611 nfsfifo_close(struct vop_close_args *ap)
3612 {
3613 	struct vnode *vp = ap->a_vp;
3614 	struct nfsnode *np = VTONFS(vp);
3615 	struct vattr vattr;
3616 	struct timespec ts;
3617 
3618 	NFSLOCKNODE(np);
3619 	if (np->n_flag & (NACC | NUPD)) {
3620 		vfs_timestamp(&ts);
3621 		if (np->n_flag & NACC)
3622 			np->n_atim = ts;
3623 		if (np->n_flag & NUPD)
3624 			np->n_mtim = ts;
3625 		np->n_flag |= NCHG;
3626 		if (vrefcnt(vp) == 1 &&
3627 		    (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
3628 			VATTR_NULL(&vattr);
3629 			if (np->n_flag & NACC)
3630 				vattr.va_atime = np->n_atim;
3631 			if (np->n_flag & NUPD)
3632 				vattr.va_mtime = np->n_mtim;
3633 			NFSUNLOCKNODE(np);
3634 			(void)VOP_SETATTR(vp, &vattr, ap->a_cred);
3635 			goto out;
3636 		}
3637 	}
3638 	NFSUNLOCKNODE(np);
3639 out:
3640 	return (fifo_specops.vop_close(ap));
3641 }
3642 
3643 /*
3644  * Just call ncl_writebp() with the force argument set to 1.
3645  *
3646  * NOTE: B_DONE may or may not be set in a_bp on call.
3647  */
3648 static int
3649 nfs_bwrite(struct buf *bp)
3650 {
3651 
3652 	return (ncl_writebp(bp, 1, curthread));
3653 }
3654 
3655 struct buf_ops buf_ops_newnfs = {
3656 	.bop_name	=	"buf_ops_nfs",
3657 	.bop_write	=	nfs_bwrite,
3658 	.bop_strategy	=	bufstrategy,
3659 	.bop_sync	=	bufsync,
3660 	.bop_bdflush	=	bufbdflush,
3661 };
3662 
3663 static int
3664 nfs_getacl(struct vop_getacl_args *ap)
3665 {
3666 	int error;
3667 
3668 	if (ap->a_type != ACL_TYPE_NFS4)
3669 		return (EOPNOTSUPP);
3670 	error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
3671 	    NULL);
3672 	if (error > NFSERR_STALE) {
3673 		(void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3674 		error = EPERM;
3675 	}
3676 	return (error);
3677 }
3678 
3679 static int
3680 nfs_setacl(struct vop_setacl_args *ap)
3681 {
3682 	int error;
3683 
3684 	if (ap->a_type != ACL_TYPE_NFS4)
3685 		return (EOPNOTSUPP);
3686 	error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
3687 	    NULL);
3688 	if (error > NFSERR_STALE) {
3689 		(void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3690 		error = EPERM;
3691 	}
3692 	return (error);
3693 }
3694 
3695 /*
3696  * VOP_ADVISE for NFS.
3697  * Just return 0 for any errors, since it is just a hint.
3698  */
3699 static int
3700 nfs_advise(struct vop_advise_args *ap)
3701 {
3702 	struct thread *td = curthread;
3703 	struct nfsmount *nmp;
3704 	uint64_t len;
3705 	int error;
3706 
3707 	/*
3708 	 * First do vop_stdadvise() to handle the buffer cache.
3709 	 */
3710 	error = vop_stdadvise(ap);
3711 	if (error != 0)
3712 		return (error);
3713 	if (ap->a_start < 0 || ap->a_end < 0)
3714 		return (0);
3715 	if (ap->a_end == OFF_MAX)
3716 		len = 0;
3717 	else if (ap->a_end < ap->a_start)
3718 		return (0);
3719 	else
3720 		len = ap->a_end - ap->a_start + 1;
3721 	nmp = VFSTONFS(ap->a_vp->v_mount);
3722 	mtx_lock(&nmp->nm_mtx);
3723 	if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
3724 	    (NFSHASPNFS(nmp) && (nmp->nm_privflag & NFSMNTP_IOADVISETHRUMDS) ==
3725 	    0) || (nmp->nm_privflag & NFSMNTP_NOADVISE) != 0) {
3726 		mtx_unlock(&nmp->nm_mtx);
3727 		return (0);
3728 	}
3729 	mtx_unlock(&nmp->nm_mtx);
3730 	error = nfsrpc_advise(ap->a_vp, ap->a_start, len, ap->a_advice,
3731 	    td->td_ucred, td);
3732 	if (error == NFSERR_NOTSUPP) {
3733 		mtx_lock(&nmp->nm_mtx);
3734 		nmp->nm_privflag |= NFSMNTP_NOADVISE;
3735 		mtx_unlock(&nmp->nm_mtx);
3736 	}
3737 	return (0);
3738 }
3739 
3740 /*
3741  * nfs allocate call
3742  */
3743 static int
3744 nfs_allocate(struct vop_allocate_args *ap)
3745 {
3746 	struct vnode *vp = ap->a_vp;
3747 	struct thread *td = curthread;
3748 	struct nfsvattr nfsva;
3749 	struct nfsmount *nmp;
3750 	struct nfsnode *np;
3751 	off_t alen;
3752 	int attrflag, error, ret;
3753 	struct timespec ts;
3754 	struct uio io;
3755 
3756 	attrflag = 0;
3757 	nmp = VFSTONFS(vp->v_mount);
3758 	np = VTONFS(vp);
3759 	mtx_lock(&nmp->nm_mtx);
3760 	if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION &&
3761 	    (nmp->nm_privflag & NFSMNTP_NOALLOCATE) == 0) {
3762 		mtx_unlock(&nmp->nm_mtx);
3763 		alen = *ap->a_len;
3764 		if ((uint64_t)alen > nfs_maxalloclen)
3765 			alen = nfs_maxalloclen;
3766 
3767 		/* Check the file size limit. */
3768 		io.uio_offset = *ap->a_offset;
3769 		io.uio_resid = alen;
3770 		error = vn_rlimit_fsize(vp, &io, td);
3771 
3772 		/*
3773 		 * Flush first to ensure that the allocate adds to the
3774 		 * file's allocation on the server.
3775 		 */
3776 		if (error == 0)
3777 			error = ncl_flush(vp, MNT_WAIT, td, 1, 0);
3778 		if (error == 0)
3779 			error = nfsrpc_allocate(vp, *ap->a_offset, alen,
3780 			    &nfsva, &attrflag, ap->a_cred, td, NULL);
3781 		if (error == 0) {
3782 			*ap->a_offset += alen;
3783 			*ap->a_len -= alen;
3784 			nanouptime(&ts);
3785 			NFSLOCKNODE(np);
3786 			np->n_localmodtime = ts;
3787 			NFSUNLOCKNODE(np);
3788 		} else if (error == NFSERR_NOTSUPP) {
3789 			mtx_lock(&nmp->nm_mtx);
3790 			nmp->nm_privflag |= NFSMNTP_NOALLOCATE;
3791 			mtx_unlock(&nmp->nm_mtx);
3792 			error = EINVAL;
3793 		}
3794 	} else {
3795 		mtx_unlock(&nmp->nm_mtx);
3796 		error = EINVAL;
3797 	}
3798 	if (attrflag != 0) {
3799 		ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
3800 		if (error == 0 && ret != 0)
3801 			error = ret;
3802 	}
3803 	if (error != 0)
3804 		error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
3805 	return (error);
3806 }
3807 
3808 /*
3809  * nfs deallocate call
3810  */
3811 static int
3812 nfs_deallocate(struct vop_deallocate_args *ap)
3813 {
3814 	struct vnode *vp = ap->a_vp;
3815 	struct thread *td = curthread;
3816 	struct nfsvattr nfsva;
3817 	struct nfsmount *nmp;
3818 	struct nfsnode *np;
3819 	off_t tlen, mlen;
3820 	int attrflag, error, ret;
3821 	bool clipped;
3822 	struct timespec ts;
3823 
3824 	error = 0;
3825 	attrflag = 0;
3826 	nmp = VFSTONFS(vp->v_mount);
3827 	np = VTONFS(vp);
3828 	mtx_lock(&nmp->nm_mtx);
3829 	if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION &&
3830 	    (nmp->nm_privflag & NFSMNTP_NODEALLOCATE) == 0) {
3831 		mtx_unlock(&nmp->nm_mtx);
3832 		tlen = omin(OFF_MAX - *ap->a_offset, *ap->a_len);
3833 		NFSCL_DEBUG(4, "dealloc: off=%jd len=%jd maxfilesize=%ju\n",
3834 		    (intmax_t)*ap->a_offset, (intmax_t)tlen,
3835 		    (uintmax_t)nmp->nm_maxfilesize);
3836 		if ((uint64_t)*ap->a_offset >= nmp->nm_maxfilesize) {
3837 			/* Avoid EFBIG error return from the NFSv4.2 server. */
3838 			*ap->a_len = 0;
3839 			return (0);
3840 		}
3841 		clipped = false;
3842 		if ((uint64_t)*ap->a_offset + tlen > nmp->nm_maxfilesize)
3843 			tlen = nmp->nm_maxfilesize - *ap->a_offset;
3844 		if ((uint64_t)*ap->a_offset < np->n_size) {
3845 			/* Limit the len to nfs_maxalloclen before EOF. */
3846 			mlen = omin((off_t)np->n_size - *ap->a_offset, tlen);
3847 			if ((uint64_t)mlen > nfs_maxalloclen) {
3848 				NFSCL_DEBUG(4, "dealloc: tlen maxalloclen\n");
3849 				tlen = nfs_maxalloclen;
3850 				clipped = true;
3851 			}
3852 		}
3853 		if (error == 0)
3854 			error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
3855 		if (error == 0) {
3856 			vnode_pager_purge_range(vp, *ap->a_offset,
3857 			    *ap->a_offset + tlen);
3858 			error = nfsrpc_deallocate(vp, *ap->a_offset, tlen,
3859 			    &nfsva, &attrflag, ap->a_cred, td, NULL);
3860 			NFSCL_DEBUG(4, "dealloc: rpc=%d\n", error);
3861 		}
3862 		if (error == 0) {
3863 			NFSCL_DEBUG(4, "dealloc: attrflag=%d na_size=%ju\n",
3864 			    attrflag, (uintmax_t)nfsva.na_size);
3865 			nanouptime(&ts);
3866 			NFSLOCKNODE(np);
3867 			np->n_localmodtime = ts;
3868 			NFSUNLOCKNODE(np);
3869 			if (attrflag != 0) {
3870 				if ((uint64_t)*ap->a_offset < nfsva.na_size)
3871 					*ap->a_offset += omin((off_t)
3872 					    nfsva.na_size - *ap->a_offset,
3873 					    tlen);
3874 			}
3875 			if (clipped && tlen < *ap->a_len)
3876 				*ap->a_len -= tlen;
3877 			else
3878 				*ap->a_len = 0;
3879 		} else if (error == NFSERR_NOTSUPP) {
3880 			mtx_lock(&nmp->nm_mtx);
3881 			nmp->nm_privflag |= NFSMNTP_NODEALLOCATE;
3882 			mtx_unlock(&nmp->nm_mtx);
3883 		}
3884 	} else {
3885 		mtx_unlock(&nmp->nm_mtx);
3886 		error = EIO;
3887 	}
3888 	/*
3889 	 * If the NFS server cannot perform the Deallocate operation, just call
3890 	 * vop_stddeallocate() to perform it.
3891 	 */
3892 	if (error != 0 && error != NFSERR_FBIG && error != NFSERR_INVAL) {
3893 		error = vop_stddeallocate(ap);
3894 		NFSCL_DEBUG(4, "dealloc: stddeallocate=%d\n", error);
3895 	}
3896 	if (attrflag != 0) {
3897 		ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
3898 		if (error == 0 && ret != 0)
3899 			error = ret;
3900 	}
3901 	if (error != 0)
3902 		error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
3903 	return (error);
3904 }
3905 
3906 /*
3907  * nfs copy_file_range call
3908  */
3909 static int
3910 nfs_copy_file_range(struct vop_copy_file_range_args *ap)
3911 {
3912 	struct vnode *invp = ap->a_invp;
3913 	struct vnode *outvp = ap->a_outvp;
3914 	struct mount *mp;
3915 	struct nfsvattr innfsva, outnfsva;
3916 	struct vattr *vap;
3917 	struct uio io;
3918 	struct nfsmount *nmp;
3919 	size_t len, len2;
3920 	int error, inattrflag, outattrflag, ret, ret2;
3921 	off_t inoff, outoff;
3922 	bool consecutive, must_commit, tryoutcred;
3923 
3924 	ret = ret2 = 0;
3925 	nmp = VFSTONFS(invp->v_mount);
3926 	mtx_lock(&nmp->nm_mtx);
3927 	/* NFSv4.2 Copy is not permitted for infile == outfile. */
3928 	if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
3929 	    (nmp->nm_privflag & NFSMNTP_NOCOPY) != 0 || invp == outvp) {
3930 		mtx_unlock(&nmp->nm_mtx);
3931 		error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp,
3932 		    ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags,
3933 		    ap->a_incred, ap->a_outcred, ap->a_fsizetd);
3934 		return (error);
3935 	}
3936 	mtx_unlock(&nmp->nm_mtx);
3937 
3938 	/* Lock both vnodes, avoiding risk of deadlock. */
3939 	do {
3940 		mp = NULL;
3941 		error = vn_start_write(outvp, &mp, V_WAIT);
3942 		if (error == 0) {
3943 			error = vn_lock(outvp, LK_EXCLUSIVE);
3944 			if (error == 0) {
3945 				error = vn_lock(invp, LK_SHARED | LK_NOWAIT);
3946 				if (error == 0)
3947 					break;
3948 				VOP_UNLOCK(outvp);
3949 				if (mp != NULL)
3950 					vn_finished_write(mp);
3951 				mp = NULL;
3952 				error = vn_lock(invp, LK_SHARED);
3953 				if (error == 0)
3954 					VOP_UNLOCK(invp);
3955 			}
3956 		}
3957 		if (mp != NULL)
3958 			vn_finished_write(mp);
3959 	} while (error == 0);
3960 	if (error != 0)
3961 		return (error);
3962 
3963 	/*
3964 	 * Do the vn_rlimit_fsize() check.  Should this be above the VOP layer?
3965 	 */
3966 	io.uio_offset = *ap->a_outoffp;
3967 	io.uio_resid = *ap->a_lenp;
3968 	error = vn_rlimit_fsize(outvp, &io, ap->a_fsizetd);
3969 
3970 	/*
3971 	 * Flush the input file so that the data is up to date before
3972 	 * the copy.  Flush writes for the output file so that they
3973 	 * do not overwrite the data copied to the output file by the Copy.
3974 	 * Set the commit argument for both flushes so that the data is on
3975 	 * stable storage before the Copy RPC.  This is done in case the
3976 	 * server reboots during the Copy and needs to be redone.
3977 	 */
3978 	if (error == 0)
3979 		error = ncl_flush(invp, MNT_WAIT, curthread, 1, 0);
3980 	if (error == 0)
3981 		error = ncl_flush(outvp, MNT_WAIT, curthread, 1, 0);
3982 
3983 	/* Do the actual NFSv4.2 RPC. */
3984 	len = *ap->a_lenp;
3985 	mtx_lock(&nmp->nm_mtx);
3986 	if ((nmp->nm_privflag & NFSMNTP_NOCONSECUTIVE) == 0)
3987 		consecutive = true;
3988 	else
3989 		consecutive = false;
3990 	mtx_unlock(&nmp->nm_mtx);
3991 	inoff = *ap->a_inoffp;
3992 	outoff = *ap->a_outoffp;
3993 	tryoutcred = true;
3994 	must_commit = false;
3995 	if (error == 0) {
3996 		vap = &VTONFS(invp)->n_vattr.na_vattr;
3997 		error = VOP_GETATTR(invp, vap, ap->a_incred);
3998 		if (error == 0) {
3999 			/*
4000 			 * Clip "len" at va_size so that RFC compliant servers
4001 			 * will not reply NFSERR_INVAL.
4002 			 * Setting "len == 0" for the RPC would be preferred,
4003 			 * but some Linux servers do not support that.
4004 			 */
4005 			if (inoff >= vap->va_size)
4006 				*ap->a_lenp = len = 0;
4007 			else if (inoff + len > vap->va_size)
4008 				*ap->a_lenp = len = vap->va_size - inoff;
4009 		} else
4010 			error = 0;
4011 	}
4012 
4013 	/*
4014 	 * len will be set to 0 upon a successful Copy RPC.
4015 	 * As such, this only loops when the Copy RPC needs to be retried.
4016 	 */
4017 	while (len > 0 && error == 0) {
4018 		inattrflag = outattrflag = 0;
4019 		len2 = len;
4020 		if (tryoutcred)
4021 			error = nfsrpc_copy_file_range(invp, ap->a_inoffp,
4022 			    outvp, ap->a_outoffp, &len2, ap->a_flags,
4023 			    &inattrflag, &innfsva, &outattrflag, &outnfsva,
4024 			    ap->a_outcred, consecutive, &must_commit);
4025 		else
4026 			error = nfsrpc_copy_file_range(invp, ap->a_inoffp,
4027 			    outvp, ap->a_outoffp, &len2, ap->a_flags,
4028 			    &inattrflag, &innfsva, &outattrflag, &outnfsva,
4029 			    ap->a_incred, consecutive, &must_commit);
4030 		if (inattrflag != 0)
4031 			ret = nfscl_loadattrcache(&invp, &innfsva, NULL, 0, 1);
4032 		if (outattrflag != 0)
4033 			ret2 = nfscl_loadattrcache(&outvp, &outnfsva, NULL,
4034 			    1, 1);
4035 		if (error == 0) {
4036 			if (consecutive == false) {
4037 				if (len2 == len) {
4038 					mtx_lock(&nmp->nm_mtx);
4039 					nmp->nm_privflag |=
4040 					    NFSMNTP_NOCONSECUTIVE;
4041 					mtx_unlock(&nmp->nm_mtx);
4042 				} else
4043 					error = NFSERR_OFFLOADNOREQS;
4044 			}
4045 			*ap->a_lenp = len2;
4046 			len = 0;
4047 			if (len2 > 0 && must_commit && error == 0)
4048 				error = ncl_commit(outvp, outoff, *ap->a_lenp,
4049 				    ap->a_outcred, curthread);
4050 			if (error == 0 && ret != 0)
4051 				error = ret;
4052 			if (error == 0 && ret2 != 0)
4053 				error = ret2;
4054 		} else if (error == NFSERR_OFFLOADNOREQS && consecutive) {
4055 			/*
4056 			 * Try consecutive == false, which is ok only if all
4057 			 * bytes are copied.
4058 			 * If only some bytes were copied when consecutive
4059 			 * is false, there is no way to know which bytes
4060 			 * still need to be written.
4061 			 */
4062 			consecutive = false;
4063 			error = 0;
4064 		} else if (error == NFSERR_ACCES && tryoutcred) {
4065 			/* Try again with incred. */
4066 			tryoutcred = false;
4067 			error = 0;
4068 		}
4069 		if (error == NFSERR_STALEWRITEVERF) {
4070 			/*
4071 			 * Server rebooted, so do it all again.
4072 			 */
4073 			*ap->a_inoffp = inoff;
4074 			*ap->a_outoffp = outoff;
4075 			len = *ap->a_lenp;
4076 			must_commit = false;
4077 			error = 0;
4078 		}
4079 	}
4080 	VOP_UNLOCK(invp);
4081 	VOP_UNLOCK(outvp);
4082 	if (mp != NULL)
4083 		vn_finished_write(mp);
4084 	if (error == NFSERR_NOTSUPP || error == NFSERR_OFFLOADNOREQS ||
4085 	    error == NFSERR_ACCES) {
4086 		/*
4087 		 * Unlike the NFSv4.2 Copy, vn_generic_copy_file_range() can
4088 		 * use a_incred for the read and a_outcred for the write, so
4089 		 * try this for NFSERR_ACCES failures for the Copy.
4090 		 * For NFSERR_NOTSUPP and NFSERR_OFFLOADNOREQS, the Copy can
4091 		 * never succeed, so disable it.
4092 		 */
4093 		if (error != NFSERR_ACCES) {
4094 			/* Can never do Copy on this mount. */
4095 			mtx_lock(&nmp->nm_mtx);
4096 			nmp->nm_privflag |= NFSMNTP_NOCOPY;
4097 			mtx_unlock(&nmp->nm_mtx);
4098 		}
4099 		*ap->a_inoffp = inoff;
4100 		*ap->a_outoffp = outoff;
4101 		error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp,
4102 		    ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags,
4103 		    ap->a_incred, ap->a_outcred, ap->a_fsizetd);
4104 	} else if (error != 0)
4105 		*ap->a_lenp = 0;
4106 
4107 	if (error != 0)
4108 		error = nfscl_maperr(curthread, error, (uid_t)0, (gid_t)0);
4109 	return (error);
4110 }
4111 
4112 /*
4113  * nfs ioctl call
4114  */
4115 static int
4116 nfs_ioctl(struct vop_ioctl_args *ap)
4117 {
4118 	struct vnode *vp = ap->a_vp;
4119 	struct nfsvattr nfsva;
4120 	struct nfsmount *nmp;
4121 	int attrflag, content, error, ret;
4122 	bool eof = false;			/* shut up compiler. */
4123 
4124 	if (vp->v_type != VREG)
4125 		return (ENOTTY);
4126 	nmp = VFSTONFS(vp->v_mount);
4127 	if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION) {
4128 		error = vop_stdioctl(ap);
4129 		return (error);
4130 	}
4131 
4132 	/* Do the actual NFSv4.2 RPC. */
4133 	switch (ap->a_command) {
4134 	case FIOSEEKDATA:
4135 		content = NFSV4CONTENT_DATA;
4136 		break;
4137 	case FIOSEEKHOLE:
4138 		content = NFSV4CONTENT_HOLE;
4139 		break;
4140 	default:
4141 		return (ENOTTY);
4142 	}
4143 
4144 	error = vn_lock(vp, LK_SHARED);
4145 	if (error != 0)
4146 		return (EBADF);
4147 	attrflag = 0;
4148 	if (*((off_t *)ap->a_data) >= VTONFS(vp)->n_size)
4149 		error = ENXIO;
4150 	else {
4151 		/*
4152 		 * Flush all writes, so that the server is up to date.
4153 		 * Although a Commit is not required, the commit argument
4154 		 * is set so that, for a pNFS File/Flexible File Layout
4155 		 * server, the LayoutCommit will be done to ensure the file
4156 		 * size is up to date on the Metadata Server.
4157 		 */
4158 		error = ncl_flush(vp, MNT_WAIT, ap->a_td, 1, 0);
4159 		if (error == 0)
4160 			error = nfsrpc_seek(vp, (off_t *)ap->a_data, &eof,
4161 			    content, ap->a_cred, &nfsva, &attrflag);
4162 		/* If at eof for FIOSEEKDATA, return ENXIO. */
4163 		if (eof && error == 0 && content == NFSV4CONTENT_DATA)
4164 			error = ENXIO;
4165 	}
4166 	if (attrflag != 0) {
4167 		ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4168 		if (error == 0 && ret != 0)
4169 			error = ret;
4170 	}
4171 	NFSVOPUNLOCK(vp);
4172 
4173 	if (error != 0)
4174 		error = ENXIO;
4175 	return (error);
4176 }
4177 
4178 /*
4179  * nfs getextattr call
4180  */
4181 static int
4182 nfs_getextattr(struct vop_getextattr_args *ap)
4183 {
4184 	struct vnode *vp = ap->a_vp;
4185 	struct nfsmount *nmp;
4186 	struct ucred *cred;
4187 	struct thread *td = ap->a_td;
4188 	struct nfsvattr nfsva;
4189 	ssize_t len;
4190 	int attrflag, error, ret;
4191 
4192 	nmp = VFSTONFS(vp->v_mount);
4193 	mtx_lock(&nmp->nm_mtx);
4194 	if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4195 	    (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4196 	    ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4197 		mtx_unlock(&nmp->nm_mtx);
4198 		return (EOPNOTSUPP);
4199 	}
4200 	mtx_unlock(&nmp->nm_mtx);
4201 
4202 	cred = ap->a_cred;
4203 	if (cred == NULL)
4204 		cred = td->td_ucred;
4205 	/* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
4206 	attrflag = 0;
4207 	error = nfsrpc_getextattr(vp, ap->a_name, ap->a_uio, &len, &nfsva,
4208 	    &attrflag, cred, td);
4209 	if (attrflag != 0) {
4210 		ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4211 		if (error == 0 && ret != 0)
4212 			error = ret;
4213 	}
4214 	if (error == 0 && ap->a_size != NULL)
4215 		*ap->a_size = len;
4216 
4217 	switch (error) {
4218 	case NFSERR_NOTSUPP:
4219 	case NFSERR_OPILLEGAL:
4220 		mtx_lock(&nmp->nm_mtx);
4221 		nmp->nm_privflag |= NFSMNTP_NOXATTR;
4222 		mtx_unlock(&nmp->nm_mtx);
4223 		error = EOPNOTSUPP;
4224 		break;
4225 	case NFSERR_NOXATTR:
4226 	case NFSERR_XATTR2BIG:
4227 		error = ENOATTR;
4228 		break;
4229 	default:
4230 		error = nfscl_maperr(td, error, 0, 0);
4231 		break;
4232 	}
4233 	return (error);
4234 }
4235 
4236 /*
4237  * nfs setextattr call
4238  */
4239 static int
4240 nfs_setextattr(struct vop_setextattr_args *ap)
4241 {
4242 	struct vnode *vp = ap->a_vp;
4243 	struct nfsmount *nmp;
4244 	struct ucred *cred;
4245 	struct thread *td = ap->a_td;
4246 	struct nfsvattr nfsva;
4247 	int attrflag, error, ret;
4248 
4249 	nmp = VFSTONFS(vp->v_mount);
4250 	mtx_lock(&nmp->nm_mtx);
4251 	if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4252 	    (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4253 	    ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4254 		mtx_unlock(&nmp->nm_mtx);
4255 		return (EOPNOTSUPP);
4256 	}
4257 	mtx_unlock(&nmp->nm_mtx);
4258 
4259 	if (ap->a_uio->uio_resid < 0)
4260 		return (EINVAL);
4261 	cred = ap->a_cred;
4262 	if (cred == NULL)
4263 		cred = td->td_ucred;
4264 	/* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
4265 	attrflag = 0;
4266 	error = nfsrpc_setextattr(vp, ap->a_name, ap->a_uio, &nfsva,
4267 	    &attrflag, cred, td);
4268 	if (attrflag != 0) {
4269 		ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4270 		if (error == 0 && ret != 0)
4271 			error = ret;
4272 	}
4273 
4274 	switch (error) {
4275 	case NFSERR_NOTSUPP:
4276 	case NFSERR_OPILLEGAL:
4277 		mtx_lock(&nmp->nm_mtx);
4278 		nmp->nm_privflag |= NFSMNTP_NOXATTR;
4279 		mtx_unlock(&nmp->nm_mtx);
4280 		error = EOPNOTSUPP;
4281 		break;
4282 	case NFSERR_NOXATTR:
4283 	case NFSERR_XATTR2BIG:
4284 		error = ENOATTR;
4285 		break;
4286 	default:
4287 		error = nfscl_maperr(td, error, 0, 0);
4288 		break;
4289 	}
4290 	return (error);
4291 }
4292 
4293 /*
4294  * nfs listextattr call
4295  */
4296 static int
4297 nfs_listextattr(struct vop_listextattr_args *ap)
4298 {
4299 	struct vnode *vp = ap->a_vp;
4300 	struct nfsmount *nmp;
4301 	struct ucred *cred;
4302 	struct thread *td = ap->a_td;
4303 	struct nfsvattr nfsva;
4304 	size_t len, len2;
4305 	uint64_t cookie;
4306 	int attrflag, error, ret;
4307 	bool eof;
4308 
4309 	nmp = VFSTONFS(vp->v_mount);
4310 	mtx_lock(&nmp->nm_mtx);
4311 	if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4312 	    (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4313 	    ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4314 		mtx_unlock(&nmp->nm_mtx);
4315 		return (EOPNOTSUPP);
4316 	}
4317 	mtx_unlock(&nmp->nm_mtx);
4318 
4319 	cred = ap->a_cred;
4320 	if (cred == NULL)
4321 		cred = td->td_ucred;
4322 
4323 	/* Loop around doing List Extended Attribute RPCs. */
4324 	eof = false;
4325 	cookie = 0;
4326 	len2 = 0;
4327 	error = 0;
4328 	while (!eof && error == 0) {
4329 		len = nmp->nm_rsize;
4330 		attrflag = 0;
4331 		error = nfsrpc_listextattr(vp, &cookie, ap->a_uio, &len, &eof,
4332 		    &nfsva, &attrflag, cred, td);
4333 		if (attrflag != 0) {
4334 			ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4335 			if (error == 0 && ret != 0)
4336 				error = ret;
4337 		}
4338 		if (error == 0) {
4339 			len2 += len;
4340 			if (len2 > SSIZE_MAX)
4341 				error = ENOATTR;
4342 		}
4343 	}
4344 	if (error == 0 && ap->a_size != NULL)
4345 		*ap->a_size = len2;
4346 
4347 	switch (error) {
4348 	case NFSERR_NOTSUPP:
4349 	case NFSERR_OPILLEGAL:
4350 		mtx_lock(&nmp->nm_mtx);
4351 		nmp->nm_privflag |= NFSMNTP_NOXATTR;
4352 		mtx_unlock(&nmp->nm_mtx);
4353 		error = EOPNOTSUPP;
4354 		break;
4355 	case NFSERR_NOXATTR:
4356 	case NFSERR_XATTR2BIG:
4357 		error = ENOATTR;
4358 		break;
4359 	default:
4360 		error = nfscl_maperr(td, error, 0, 0);
4361 		break;
4362 	}
4363 	return (error);
4364 }
4365 
4366 /*
4367  * nfs setextattr call
4368  */
4369 static int
4370 nfs_deleteextattr(struct vop_deleteextattr_args *ap)
4371 {
4372 	struct vnode *vp = ap->a_vp;
4373 	struct nfsmount *nmp;
4374 	struct nfsvattr nfsva;
4375 	int attrflag, error, ret;
4376 
4377 	nmp = VFSTONFS(vp->v_mount);
4378 	mtx_lock(&nmp->nm_mtx);
4379 	if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4380 	    (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4381 	    ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4382 		mtx_unlock(&nmp->nm_mtx);
4383 		return (EOPNOTSUPP);
4384 	}
4385 	mtx_unlock(&nmp->nm_mtx);
4386 
4387 	/* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
4388 	attrflag = 0;
4389 	error = nfsrpc_rmextattr(vp, ap->a_name, &nfsva, &attrflag, ap->a_cred,
4390 	    ap->a_td);
4391 	if (attrflag != 0) {
4392 		ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4393 		if (error == 0 && ret != 0)
4394 			error = ret;
4395 	}
4396 
4397 	switch (error) {
4398 	case NFSERR_NOTSUPP:
4399 	case NFSERR_OPILLEGAL:
4400 		mtx_lock(&nmp->nm_mtx);
4401 		nmp->nm_privflag |= NFSMNTP_NOXATTR;
4402 		mtx_unlock(&nmp->nm_mtx);
4403 		error = EOPNOTSUPP;
4404 		break;
4405 	case NFSERR_NOXATTR:
4406 	case NFSERR_XATTR2BIG:
4407 		error = ENOATTR;
4408 		break;
4409 	default:
4410 		error = nfscl_maperr(ap->a_td, error, 0, 0);
4411 		break;
4412 	}
4413 	return (error);
4414 }
4415 
4416 /*
4417  * Return POSIX pathconf information applicable to nfs filesystems.
4418  */
4419 static int
4420 nfs_pathconf(struct vop_pathconf_args *ap)
4421 {
4422 	struct nfsv3_pathconf pc;
4423 	struct nfsvattr nfsva;
4424 	struct vnode *vp = ap->a_vp;
4425 	struct nfsmount *nmp;
4426 	struct thread *td = curthread;
4427 	off_t off;
4428 	bool eof;
4429 	int attrflag, error;
4430 
4431 	if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX ||
4432 	    ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
4433 	    ap->a_name == _PC_NO_TRUNC)) ||
4434 	    (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) {
4435 		/*
4436 		 * Since only the above 4 a_names are returned by the NFSv3
4437 		 * Pathconf RPC, there is no point in doing it for others.
4438 		 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can
4439 		 * be used for _PC_NFS4_ACL as well.
4440 		 */
4441 		error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva,
4442 		    &attrflag, NULL);
4443 		if (attrflag != 0)
4444 			(void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4445 		if (error != 0)
4446 			return (error);
4447 	} else {
4448 		/*
4449 		 * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
4450 		 * just fake them.
4451 		 */
4452 		pc.pc_linkmax = NFS_LINK_MAX;
4453 		pc.pc_namemax = NFS_MAXNAMLEN;
4454 		pc.pc_notrunc = 1;
4455 		pc.pc_chownrestricted = 1;
4456 		pc.pc_caseinsensitive = 0;
4457 		pc.pc_casepreserving = 1;
4458 		error = 0;
4459 	}
4460 	switch (ap->a_name) {
4461 	case _PC_LINK_MAX:
4462 #ifdef _LP64
4463 		*ap->a_retval = pc.pc_linkmax;
4464 #else
4465 		*ap->a_retval = MIN(LONG_MAX, pc.pc_linkmax);
4466 #endif
4467 		break;
4468 	case _PC_NAME_MAX:
4469 		*ap->a_retval = pc.pc_namemax;
4470 		break;
4471 	case _PC_PIPE_BUF:
4472 		if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO)
4473 			*ap->a_retval = PIPE_BUF;
4474 		else
4475 			error = EINVAL;
4476 		break;
4477 	case _PC_CHOWN_RESTRICTED:
4478 		*ap->a_retval = pc.pc_chownrestricted;
4479 		break;
4480 	case _PC_NO_TRUNC:
4481 		*ap->a_retval = pc.pc_notrunc;
4482 		break;
4483 	case _PC_ACL_NFS4:
4484 		if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
4485 		    NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
4486 			*ap->a_retval = 1;
4487 		else
4488 			*ap->a_retval = 0;
4489 		break;
4490 	case _PC_ACL_PATH_MAX:
4491 		if (NFS_ISV4(vp))
4492 			*ap->a_retval = ACL_MAX_ENTRIES;
4493 		else
4494 			*ap->a_retval = 3;
4495 		break;
4496 	case _PC_PRIO_IO:
4497 		*ap->a_retval = 0;
4498 		break;
4499 	case _PC_SYNC_IO:
4500 		*ap->a_retval = 0;
4501 		break;
4502 	case _PC_ALLOC_SIZE_MIN:
4503 		*ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
4504 		break;
4505 	case _PC_FILESIZEBITS:
4506 		if (NFS_ISV34(vp))
4507 			*ap->a_retval = 64;
4508 		else
4509 			*ap->a_retval = 32;
4510 		break;
4511 	case _PC_REC_INCR_XFER_SIZE:
4512 		*ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
4513 		break;
4514 	case _PC_REC_MAX_XFER_SIZE:
4515 		*ap->a_retval = -1; /* means ``unlimited'' */
4516 		break;
4517 	case _PC_REC_MIN_XFER_SIZE:
4518 		*ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
4519 		break;
4520 	case _PC_REC_XFER_ALIGN:
4521 		*ap->a_retval = PAGE_SIZE;
4522 		break;
4523 	case _PC_SYMLINK_MAX:
4524 		*ap->a_retval = NFS_MAXPATHLEN;
4525 		break;
4526 	case _PC_MIN_HOLE_SIZE:
4527 		/* Only some NFSv4.2 servers support Seek for Holes. */
4528 		*ap->a_retval = 0;
4529 		nmp = VFSTONFS(vp->v_mount);
4530 		if (NFS_ISV4(vp) && nmp->nm_minorvers == NFSV42_MINORVERSION) {
4531 			/*
4532 			 * NFSv4.2 doesn't have an attribute for hole size,
4533 			 * so all we can do is see if the Seek operation is
4534 			 * supported and then use f_iosize as a "best guess".
4535 			 */
4536 			mtx_lock(&nmp->nm_mtx);
4537 			if ((nmp->nm_privflag & NFSMNTP_SEEKTESTED) == 0) {
4538 				mtx_unlock(&nmp->nm_mtx);
4539 				off = 0;
4540 				attrflag = 0;
4541 				error = nfsrpc_seek(vp, &off, &eof,
4542 				    NFSV4CONTENT_HOLE, td->td_ucred, &nfsva,
4543 				    &attrflag);
4544 				if (attrflag != 0)
4545 					nfscl_loadattrcache(&vp, &nfsva,
4546 					    NULL, 0, 1);
4547 				mtx_lock(&nmp->nm_mtx);
4548 				if (error == NFSERR_NOTSUPP)
4549 					nmp->nm_privflag |= NFSMNTP_SEEKTESTED;
4550 				else
4551 					nmp->nm_privflag |= NFSMNTP_SEEKTESTED |
4552 					    NFSMNTP_SEEK;
4553 				error = 0;
4554 			}
4555 			if ((nmp->nm_privflag & NFSMNTP_SEEK) != 0)
4556 				*ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
4557 			mtx_unlock(&nmp->nm_mtx);
4558 		}
4559 		break;
4560 
4561 	default:
4562 		error = vop_stdpathconf(ap);
4563 		break;
4564 	}
4565 	return (error);
4566 }
4567