xref: /freebsd/sys/fs/nfsclient/nfs_clport.c (revision b3512b30dbec579da28028e29d8b33ec7242af68)
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  */
35 
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38 
39 #include "opt_inet.h"
40 #include "opt_inet6.h"
41 
42 #include <sys/capsicum.h>
43 
44 /*
45  * generally, I don't like #includes inside .h files, but it seems to
46  * be the easiest way to handle the port.
47  */
48 #include <sys/fail.h>
49 #include <sys/hash.h>
50 #include <sys/sysctl.h>
51 #include <fs/nfs/nfsport.h>
52 #include <netinet/in_fib.h>
53 #include <netinet/if_ether.h>
54 #include <netinet6/ip6_var.h>
55 #include <net/if_types.h>
56 #include <net/route/nhop.h>
57 
58 #include <fs/nfsclient/nfs_kdtrace.h>
59 
60 #ifdef KDTRACE_HOOKS
61 dtrace_nfsclient_attrcache_flush_probe_func_t
62 		dtrace_nfscl_attrcache_flush_done_probe;
63 uint32_t	nfscl_attrcache_flush_done_id;
64 
65 dtrace_nfsclient_attrcache_get_hit_probe_func_t
66 		dtrace_nfscl_attrcache_get_hit_probe;
67 uint32_t	nfscl_attrcache_get_hit_id;
68 
69 dtrace_nfsclient_attrcache_get_miss_probe_func_t
70 		dtrace_nfscl_attrcache_get_miss_probe;
71 uint32_t	nfscl_attrcache_get_miss_id;
72 
73 dtrace_nfsclient_attrcache_load_probe_func_t
74 		dtrace_nfscl_attrcache_load_done_probe;
75 uint32_t	nfscl_attrcache_load_done_id;
76 #endif /* !KDTRACE_HOOKS */
77 
78 extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
79 extern struct vop_vector newnfs_vnodeops;
80 extern struct vop_vector newnfs_fifoops;
81 extern uma_zone_t newnfsnode_zone;
82 extern struct buf_ops buf_ops_newnfs;
83 extern uma_zone_t ncl_pbuf_zone;
84 extern short nfsv4_cbport;
85 extern int nfscl_enablecallb;
86 extern int nfs_numnfscbd;
87 extern int nfscl_inited;
88 struct mtx ncl_iod_mutex;
89 NFSDLOCKMUTEX;
90 extern struct mtx nfsrv_dslock_mtx;
91 
92 extern void (*ncl_call_invalcaches)(struct vnode *);
93 
94 SYSCTL_DECL(_vfs_nfs);
95 static int ncl_fileid_maxwarnings = 10;
96 SYSCTL_INT(_vfs_nfs, OID_AUTO, fileid_maxwarnings, CTLFLAG_RWTUN,
97     &ncl_fileid_maxwarnings, 0,
98     "Limit fileid corruption warnings; 0 is off; -1 is unlimited");
99 static volatile int ncl_fileid_nwarnings;
100 
101 static void nfscl_warn_fileid(struct nfsmount *, struct nfsvattr *,
102     struct nfsvattr *);
103 
104 /*
105  * Comparison function for vfs_hash functions.
106  */
107 int
108 newnfs_vncmpf(struct vnode *vp, void *arg)
109 {
110 	struct nfsfh *nfhp = (struct nfsfh *)arg;
111 	struct nfsnode *np = VTONFS(vp);
112 
113 	if (np->n_fhp->nfh_len != nfhp->nfh_len ||
114 	    NFSBCMP(np->n_fhp->nfh_fh, nfhp->nfh_fh, nfhp->nfh_len))
115 		return (1);
116 	return (0);
117 }
118 
119 /*
120  * Look up a vnode/nfsnode by file handle.
121  * Callers must check for mount points!!
122  * In all cases, a pointer to a
123  * nfsnode structure is returned.
124  * This variant takes a "struct nfsfh *" as second argument and uses
125  * that structure up, either by hanging off the nfsnode or FREEing it.
126  */
127 int
128 nfscl_nget(struct mount *mntp, struct vnode *dvp, struct nfsfh *nfhp,
129     struct componentname *cnp, struct thread *td, struct nfsnode **npp,
130     void *stuff, int lkflags)
131 {
132 	struct nfsnode *np, *dnp;
133 	struct vnode *vp, *nvp;
134 	struct nfsv4node *newd, *oldd;
135 	int error;
136 	u_int hash;
137 	struct nfsmount *nmp;
138 
139 	nmp = VFSTONFS(mntp);
140 	dnp = VTONFS(dvp);
141 	*npp = NULL;
142 
143 	hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len, FNV1_32_INIT);
144 
145 	error = vfs_hash_get(mntp, hash, lkflags,
146 	    td, &nvp, newnfs_vncmpf, nfhp);
147 	if (error == 0 && nvp != NULL) {
148 		/*
149 		 * I believe there is a slight chance that vgonel() could
150 		 * get called on this vnode between when NFSVOPLOCK() drops
151 		 * the VI_LOCK() and vget() acquires it again, so that it
152 		 * hasn't yet had v_usecount incremented. If this were to
153 		 * happen, the VIRF_DOOMED flag would be set, so check for
154 		 * that here. Since we now have the v_usecount incremented,
155 		 * we should be ok until we vrele() it, if the VIRF_DOOMED
156 		 * flag isn't set now.
157 		 */
158 		VI_LOCK(nvp);
159 		if (VN_IS_DOOMED(nvp)) {
160 			VI_UNLOCK(nvp);
161 			vrele(nvp);
162 			error = ENOENT;
163 		} else {
164 			VI_UNLOCK(nvp);
165 		}
166 	}
167 	if (error) {
168 		free(nfhp, M_NFSFH);
169 		return (error);
170 	}
171 	if (nvp != NULL) {
172 		np = VTONFS(nvp);
173 		/*
174 		 * For NFSv4, check to see if it is the same name and
175 		 * replace the name, if it is different.
176 		 */
177 		oldd = newd = NULL;
178 		if ((nmp->nm_flag & NFSMNT_NFSV4) && np->n_v4 != NULL &&
179 		    nvp->v_type == VREG &&
180 		    (np->n_v4->n4_namelen != cnp->cn_namelen ||
181 		     NFSBCMP(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
182 		     cnp->cn_namelen) ||
183 		     dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
184 		     NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
185 		     dnp->n_fhp->nfh_len))) {
186 		    newd = malloc(
187 			sizeof (struct nfsv4node) + dnp->n_fhp->nfh_len +
188 			+ cnp->cn_namelen - 1, M_NFSV4NODE, M_WAITOK);
189 		    NFSLOCKNODE(np);
190 		    if (newd != NULL && np->n_v4 != NULL && nvp->v_type == VREG
191 			&& (np->n_v4->n4_namelen != cnp->cn_namelen ||
192 			 NFSBCMP(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
193 			 cnp->cn_namelen) ||
194 			 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
195 			 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
196 			 dnp->n_fhp->nfh_len))) {
197 			oldd = np->n_v4;
198 			np->n_v4 = newd;
199 			newd = NULL;
200 			np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
201 			np->n_v4->n4_namelen = cnp->cn_namelen;
202 			NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
203 			    dnp->n_fhp->nfh_len);
204 			NFSBCOPY(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
205 			    cnp->cn_namelen);
206 		    }
207 		    NFSUNLOCKNODE(np);
208 		}
209 		if (newd != NULL)
210 			free(newd, M_NFSV4NODE);
211 		if (oldd != NULL)
212 			free(oldd, M_NFSV4NODE);
213 		*npp = np;
214 		free(nfhp, M_NFSFH);
215 		return (0);
216 	}
217 	np = uma_zalloc(newnfsnode_zone, M_WAITOK | M_ZERO);
218 
219 	error = getnewvnode(nfs_vnode_tag, mntp, &newnfs_vnodeops, &nvp);
220 	if (error) {
221 		uma_zfree(newnfsnode_zone, np);
222 		free(nfhp, M_NFSFH);
223 		return (error);
224 	}
225 	vp = nvp;
226 	KASSERT(vp->v_bufobj.bo_bsize != 0, ("nfscl_nget: bo_bsize == 0"));
227 	vp->v_bufobj.bo_ops = &buf_ops_newnfs;
228 	vp->v_data = np;
229 	np->n_vnode = vp;
230 	/*
231 	 * Initialize the mutex even if the vnode is going to be a loser.
232 	 * This simplifies the logic in reclaim, which can then unconditionally
233 	 * destroy the mutex (in the case of the loser, or if hash_insert
234 	 * happened to return an error no special casing is needed).
235 	 */
236 	mtx_init(&np->n_mtx, "NEWNFSnode lock", NULL, MTX_DEF | MTX_DUPOK);
237 	lockinit(&np->n_excl, PVFS, "nfsupg", VLKTIMEOUT, LK_NOSHARE |
238 	    LK_CANRECURSE);
239 
240 	/*
241 	 * Are we getting the root? If so, make sure the vnode flags
242 	 * are correct
243 	 */
244 	if ((nfhp->nfh_len == nmp->nm_fhsize) &&
245 	    !bcmp(nfhp->nfh_fh, nmp->nm_fh, nfhp->nfh_len)) {
246 		if (vp->v_type == VNON)
247 			vp->v_type = VDIR;
248 		vp->v_vflag |= VV_ROOT;
249 	}
250 
251 	vp->v_vflag |= VV_VMSIZEVNLOCK;
252 
253 	np->n_fhp = nfhp;
254 	/*
255 	 * For NFSv4, we have to attach the directory file handle and
256 	 * file name, so that Open Ops can be done later.
257 	 */
258 	if (nmp->nm_flag & NFSMNT_NFSV4) {
259 		np->n_v4 = malloc(sizeof (struct nfsv4node)
260 		    + dnp->n_fhp->nfh_len + cnp->cn_namelen - 1, M_NFSV4NODE,
261 		    M_WAITOK);
262 		np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
263 		np->n_v4->n4_namelen = cnp->cn_namelen;
264 		NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
265 		    dnp->n_fhp->nfh_len);
266 		NFSBCOPY(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
267 		    cnp->cn_namelen);
268 	} else {
269 		np->n_v4 = NULL;
270 	}
271 
272 	/*
273 	 * NFS supports recursive and shared locking.
274 	 */
275 	lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
276 	VN_LOCK_AREC(vp);
277 	VN_LOCK_ASHARE(vp);
278 	error = insmntque(vp, mntp);
279 	if (error != 0) {
280 		*npp = NULL;
281 		mtx_destroy(&np->n_mtx);
282 		lockdestroy(&np->n_excl);
283 		free(nfhp, M_NFSFH);
284 		if (np->n_v4 != NULL)
285 			free(np->n_v4, M_NFSV4NODE);
286 		uma_zfree(newnfsnode_zone, np);
287 		return (error);
288 	}
289 	error = vfs_hash_insert(vp, hash, lkflags,
290 	    td, &nvp, newnfs_vncmpf, nfhp);
291 	if (error)
292 		return (error);
293 	if (nvp != NULL) {
294 		*npp = VTONFS(nvp);
295 		/* vfs_hash_insert() vput()'s the losing vnode */
296 		return (0);
297 	}
298 	*npp = np;
299 
300 	return (0);
301 }
302 
303 /*
304  * Another variant of nfs_nget(). This one is only used by reopen. It
305  * takes almost the same args as nfs_nget(), but only succeeds if an entry
306  * exists in the cache. (Since files should already be "open" with a
307  * vnode ref cnt on the node when reopen calls this, it should always
308  * succeed.)
309  * Also, don't get a vnode lock, since it may already be locked by some
310  * other process that is handling it. This is ok, since all other threads
311  * on the client are blocked by the nfsc_lock being exclusively held by the
312  * caller of this function.
313  */
314 int
315 nfscl_ngetreopen(struct mount *mntp, u_int8_t *fhp, int fhsize,
316     struct thread *td, struct nfsnode **npp)
317 {
318 	struct vnode *nvp;
319 	u_int hash;
320 	struct nfsfh *nfhp;
321 	int error;
322 
323 	*npp = NULL;
324 	/* For forced dismounts, just return error. */
325 	if (NFSCL_FORCEDISM(mntp))
326 		return (EINTR);
327 	nfhp = malloc(sizeof (struct nfsfh) + fhsize,
328 	    M_NFSFH, M_WAITOK);
329 	bcopy(fhp, &nfhp->nfh_fh[0], fhsize);
330 	nfhp->nfh_len = fhsize;
331 
332 	hash = fnv_32_buf(fhp, fhsize, FNV1_32_INIT);
333 
334 	/*
335 	 * First, try to get the vnode locked, but don't block for the lock.
336 	 */
337 	error = vfs_hash_get(mntp, hash, (LK_EXCLUSIVE | LK_NOWAIT), td, &nvp,
338 	    newnfs_vncmpf, nfhp);
339 	if (error == 0 && nvp != NULL) {
340 		NFSVOPUNLOCK(nvp);
341 	} else if (error == EBUSY) {
342 		/*
343 		 * It is safe so long as a vflush() with
344 		 * FORCECLOSE has not been done. Since the Renew thread is
345 		 * stopped and the MNTK_UNMOUNTF flag is set before doing
346 		 * a vflush() with FORCECLOSE, we should be ok here.
347 		 */
348 		if (NFSCL_FORCEDISM(mntp))
349 			error = EINTR;
350 		else {
351 			vfs_hash_ref(mntp, hash, td, &nvp, newnfs_vncmpf, nfhp);
352 			if (nvp == NULL) {
353 				error = ENOENT;
354 			} else if (VN_IS_DOOMED(nvp)) {
355 				error = ENOENT;
356 				vrele(nvp);
357 			} else {
358 				error = 0;
359 			}
360 		}
361 	}
362 	free(nfhp, M_NFSFH);
363 	if (error)
364 		return (error);
365 	if (nvp != NULL) {
366 		*npp = VTONFS(nvp);
367 		return (0);
368 	}
369 	return (EINVAL);
370 }
371 
372 static void
373 nfscl_warn_fileid(struct nfsmount *nmp, struct nfsvattr *oldnap,
374     struct nfsvattr *newnap)
375 {
376 	int off;
377 
378 	if (ncl_fileid_maxwarnings >= 0 &&
379 	    ncl_fileid_nwarnings >= ncl_fileid_maxwarnings)
380 		return;
381 	off = 0;
382 	if (ncl_fileid_maxwarnings >= 0) {
383 		if (++ncl_fileid_nwarnings >= ncl_fileid_maxwarnings)
384 			off = 1;
385 	}
386 
387 	printf("newnfs: server '%s' error: fileid changed. "
388 	    "fsid %jx:%jx: expected fileid %#jx, got %#jx. "
389 	    "(BROKEN NFS SERVER OR MIDDLEWARE)\n",
390 	    nmp->nm_com.nmcom_hostname,
391 	    (uintmax_t)nmp->nm_fsid[0],
392 	    (uintmax_t)nmp->nm_fsid[1],
393 	    (uintmax_t)oldnap->na_fileid,
394 	    (uintmax_t)newnap->na_fileid);
395 
396 	if (off)
397 		printf("newnfs: Logged %d times about fileid corruption; "
398 		    "going quiet to avoid spamming logs excessively. (Limit "
399 		    "is: %d).\n", ncl_fileid_nwarnings,
400 		    ncl_fileid_maxwarnings);
401 }
402 
403 /*
404  * Load the attribute cache (that lives in the nfsnode entry) with
405  * the attributes of the second argument and
406  * Iff vaper not NULL
407  *    copy the attributes to *vaper
408  * Similar to nfs_loadattrcache(), except the attributes are passed in
409  * instead of being parsed out of the mbuf list.
410  */
411 int
412 nfscl_loadattrcache(struct vnode **vpp, struct nfsvattr *nap, void *nvaper,
413     void *stuff, int writeattr, int dontshrink)
414 {
415 	struct vnode *vp = *vpp;
416 	struct vattr *vap, *nvap = &nap->na_vattr, *vaper = nvaper;
417 	struct nfsnode *np;
418 	struct nfsmount *nmp;
419 	struct timespec mtime_save;
420 	int error, force_fid_err;
421 
422 	error = 0;
423 
424 	/*
425 	 * If v_type == VNON it is a new node, so fill in the v_type,
426 	 * n_mtime fields. Check to see if it represents a special
427 	 * device, and if so, check for a possible alias. Once the
428 	 * correct vnode has been obtained, fill in the rest of the
429 	 * information.
430 	 */
431 	np = VTONFS(vp);
432 	NFSLOCKNODE(np);
433 	if (vp->v_type != nvap->va_type) {
434 		vp->v_type = nvap->va_type;
435 		if (vp->v_type == VFIFO)
436 			vp->v_op = &newnfs_fifoops;
437 		np->n_mtime = nvap->va_mtime;
438 	}
439 	nmp = VFSTONFS(vp->v_mount);
440 	vap = &np->n_vattr.na_vattr;
441 	mtime_save = vap->va_mtime;
442 	if (writeattr) {
443 		np->n_vattr.na_filerev = nap->na_filerev;
444 		np->n_vattr.na_size = nap->na_size;
445 		np->n_vattr.na_mtime = nap->na_mtime;
446 		np->n_vattr.na_ctime = nap->na_ctime;
447 		np->n_vattr.na_fsid = nap->na_fsid;
448 		np->n_vattr.na_mode = nap->na_mode;
449 	} else {
450 		force_fid_err = 0;
451 		KFAIL_POINT_ERROR(DEBUG_FP, nfscl_force_fileid_warning,
452 		    force_fid_err);
453 		/*
454 		 * BROKEN NFS SERVER OR MIDDLEWARE
455 		 *
456 		 * Certain NFS servers (certain old proprietary filers ca.
457 		 * 2006) or broken middleboxes (e.g. WAN accelerator products)
458 		 * will respond to GETATTR requests with results for a
459 		 * different fileid.
460 		 *
461 		 * The WAN accelerator we've observed not only serves stale
462 		 * cache results for a given file, it also occasionally serves
463 		 * results for wholly different files.  This causes surprising
464 		 * problems; for example the cached size attribute of a file
465 		 * may truncate down and then back up, resulting in zero
466 		 * regions in file contents read by applications.  We observed
467 		 * this reliably with Clang and .c files during parallel build.
468 		 * A pcap revealed packet fragmentation and GETATTR RPC
469 		 * responses with wholly wrong fileids.
470 		 */
471 		if ((np->n_vattr.na_fileid != 0 &&
472 		     np->n_vattr.na_fileid != nap->na_fileid) ||
473 		    force_fid_err) {
474 			nfscl_warn_fileid(nmp, &np->n_vattr, nap);
475 			error = EIDRM;
476 			goto out;
477 		}
478 		NFSBCOPY((caddr_t)nap, (caddr_t)&np->n_vattr,
479 		    sizeof (struct nfsvattr));
480 	}
481 
482 	/*
483 	 * For NFSv4, if the node's fsid is not equal to the mount point's
484 	 * fsid, return the low order 32bits of the node's fsid. This
485 	 * allows getcwd(3) to work. There is a chance that the fsid might
486 	 * be the same as a local fs, but since this is in an NFS mount
487 	 * point, I don't think that will cause any problems?
488 	 */
489 	if (NFSHASNFSV4(nmp) && NFSHASHASSETFSID(nmp) &&
490 	    (nmp->nm_fsid[0] != np->n_vattr.na_filesid[0] ||
491 	     nmp->nm_fsid[1] != np->n_vattr.na_filesid[1])) {
492 		/*
493 		 * va_fsid needs to be set to some value derived from
494 		 * np->n_vattr.na_filesid that is not equal
495 		 * vp->v_mount->mnt_stat.f_fsid[0], so that it changes
496 		 * from the value used for the top level server volume
497 		 * in the mounted subtree.
498 		 */
499 		vn_fsid(vp, vap);
500 		if ((uint32_t)vap->va_fsid == np->n_vattr.na_filesid[0])
501 			vap->va_fsid = hash32_buf(
502 			    np->n_vattr.na_filesid, 2 * sizeof(uint64_t), 0);
503 	} else
504 		vn_fsid(vp, vap);
505 	np->n_attrstamp = time_second;
506 	if (vap->va_size != np->n_size) {
507 		if (vap->va_type == VREG) {
508 			if (dontshrink && vap->va_size < np->n_size) {
509 				/*
510 				 * We've been told not to shrink the file;
511 				 * zero np->n_attrstamp to indicate that
512 				 * the attributes are stale.
513 				 */
514 				vap->va_size = np->n_size;
515 				np->n_attrstamp = 0;
516 				KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
517 			} else if (np->n_flag & NMODIFIED) {
518 				/*
519 				 * We've modified the file: Use the larger
520 				 * of our size, and the server's size.
521 				 */
522 				if (vap->va_size < np->n_size) {
523 					vap->va_size = np->n_size;
524 				} else {
525 					np->n_size = vap->va_size;
526 					np->n_flag |= NSIZECHANGED;
527 				}
528 			} else {
529 				np->n_size = vap->va_size;
530 				np->n_flag |= NSIZECHANGED;
531 			}
532 		} else {
533 			np->n_size = vap->va_size;
534 		}
535 	}
536 	/*
537 	 * The following checks are added to prevent a race between (say)
538 	 * a READDIR+ and a WRITE.
539 	 * READDIR+, WRITE requests sent out.
540 	 * READDIR+ resp, WRITE resp received on client.
541 	 * However, the WRITE resp was handled before the READDIR+ resp
542 	 * causing the post op attrs from the write to be loaded first
543 	 * and the attrs from the READDIR+ to be loaded later. If this
544 	 * happens, we have stale attrs loaded into the attrcache.
545 	 * We detect this by for the mtime moving back. We invalidate the
546 	 * attrcache when this happens.
547 	 */
548 	if (timespeccmp(&mtime_save, &vap->va_mtime, >)) {
549 		/* Size changed or mtime went backwards */
550 		np->n_attrstamp = 0;
551 		KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
552 	}
553 	if (vaper != NULL) {
554 		NFSBCOPY((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
555 		if (np->n_flag & NCHG) {
556 			if (np->n_flag & NACC)
557 				vaper->va_atime = np->n_atim;
558 			if (np->n_flag & NUPD)
559 				vaper->va_mtime = np->n_mtim;
560 		}
561 	}
562 
563 out:
564 #ifdef KDTRACE_HOOKS
565 	if (np->n_attrstamp != 0)
566 		KDTRACE_NFS_ATTRCACHE_LOAD_DONE(vp, vap, error);
567 #endif
568 	(void)ncl_pager_setsize(vp, NULL);
569 	return (error);
570 }
571 
572 /*
573  * Call vnode_pager_setsize() if the size of the node changed, as
574  * recorded in nfsnode vs. v_object, or delay the call if notifying
575  * the pager is not possible at the moment.
576  *
577  * If nsizep is non-NULL, the call is delayed and the new node size is
578  * provided.  Caller should itself call vnode_pager_setsize() if
579  * function returned true.  If nsizep is NULL, function tries to call
580  * vnode_pager_setsize() itself if needed and possible, and the nfs
581  * node is unlocked unconditionally, the return value is not useful.
582  */
583 bool
584 ncl_pager_setsize(struct vnode *vp, u_quad_t *nsizep)
585 {
586 	struct nfsnode *np;
587 	vm_object_t object;
588 	struct vattr *vap;
589 	u_quad_t nsize;
590 	bool setnsize;
591 
592 	np = VTONFS(vp);
593 	NFSASSERTNODE(np);
594 
595 	vap = &np->n_vattr.na_vattr;
596 	nsize = vap->va_size;
597 	object = vp->v_object;
598 	setnsize = false;
599 
600 	if (object != NULL && nsize != object->un_pager.vnp.vnp_size) {
601 		if (VOP_ISLOCKED(vp) == LK_EXCLUSIVE &&
602 		    (curthread->td_pflags2 & TDP2_SBPAGES) == 0)
603 			setnsize = true;
604 		else
605 			np->n_flag |= NVNSETSZSKIP;
606 	}
607 	if (nsizep == NULL) {
608 		NFSUNLOCKNODE(np);
609 		if (setnsize)
610 			vnode_pager_setsize(vp, nsize);
611 		setnsize = false;
612 	} else {
613 		*nsizep = nsize;
614 	}
615 	return (setnsize);
616 }
617 
618 /*
619  * Fill in the client id name. For these bytes:
620  * 1 - they must be unique
621  * 2 - they should be persistent across client reboots
622  * 1 is more critical than 2
623  * Use the mount point's unique id plus either the uuid or, if that
624  * isn't set, random junk.
625  */
626 void
627 nfscl_fillclid(u_int64_t clval, char *uuid, u_int8_t *cp, u_int16_t idlen)
628 {
629 	int uuidlen;
630 
631 	/*
632 	 * First, put in the 64bit mount point identifier.
633 	 */
634 	if (idlen >= sizeof (u_int64_t)) {
635 		NFSBCOPY((caddr_t)&clval, cp, sizeof (u_int64_t));
636 		cp += sizeof (u_int64_t);
637 		idlen -= sizeof (u_int64_t);
638 	}
639 
640 	/*
641 	 * If uuid is non-zero length, use it.
642 	 */
643 	uuidlen = strlen(uuid);
644 	if (uuidlen > 0 && idlen >= uuidlen) {
645 		NFSBCOPY(uuid, cp, uuidlen);
646 		cp += uuidlen;
647 		idlen -= uuidlen;
648 	}
649 
650 	/*
651 	 * This only normally happens if the uuid isn't set.
652 	 */
653 	while (idlen > 0) {
654 		*cp++ = (u_int8_t)(arc4random() % 256);
655 		idlen--;
656 	}
657 }
658 
659 /*
660  * Fill in a lock owner name. For now, pid + the process's creation time.
661  */
662 void
663 nfscl_filllockowner(void *id, u_int8_t *cp, int flags)
664 {
665 	union {
666 		u_int32_t	lval;
667 		u_int8_t	cval[4];
668 	} tl;
669 	struct proc *p;
670 
671 	if (id == NULL) {
672 		/* Return the single open_owner of all 0 bytes. */
673 		bzero(cp, NFSV4CL_LOCKNAMELEN);
674 		return;
675 	}
676 	if ((flags & F_POSIX) != 0) {
677 		p = (struct proc *)id;
678 		tl.lval = p->p_pid;
679 		*cp++ = tl.cval[0];
680 		*cp++ = tl.cval[1];
681 		*cp++ = tl.cval[2];
682 		*cp++ = tl.cval[3];
683 		tl.lval = p->p_stats->p_start.tv_sec;
684 		*cp++ = tl.cval[0];
685 		*cp++ = tl.cval[1];
686 		*cp++ = tl.cval[2];
687 		*cp++ = tl.cval[3];
688 		tl.lval = p->p_stats->p_start.tv_usec;
689 		*cp++ = tl.cval[0];
690 		*cp++ = tl.cval[1];
691 		*cp++ = tl.cval[2];
692 		*cp = tl.cval[3];
693 	} else if ((flags & F_FLOCK) != 0) {
694 		bcopy(&id, cp, sizeof(id));
695 		bzero(&cp[sizeof(id)], NFSV4CL_LOCKNAMELEN - sizeof(id));
696 	} else {
697 		printf("nfscl_filllockowner: not F_POSIX or F_FLOCK\n");
698 		bzero(cp, NFSV4CL_LOCKNAMELEN);
699 	}
700 }
701 
702 /*
703  * Find the parent process for the thread passed in as an argument.
704  * If none exists, return NULL, otherwise return a thread for the parent.
705  * (Can be any of the threads, since it is only used for td->td_proc.)
706  */
707 NFSPROC_T *
708 nfscl_getparent(struct thread *td)
709 {
710 	struct proc *p;
711 	struct thread *ptd;
712 
713 	if (td == NULL)
714 		return (NULL);
715 	p = td->td_proc;
716 	if (p->p_pid == 0)
717 		return (NULL);
718 	p = p->p_pptr;
719 	if (p == NULL)
720 		return (NULL);
721 	ptd = TAILQ_FIRST(&p->p_threads);
722 	return (ptd);
723 }
724 
725 /*
726  * Start up the renew kernel thread.
727  */
728 static void
729 start_nfscl(void *arg)
730 {
731 	struct nfsclclient *clp;
732 	struct thread *td;
733 
734 	clp = (struct nfsclclient *)arg;
735 	td = TAILQ_FIRST(&clp->nfsc_renewthread->p_threads);
736 	nfscl_renewthread(clp, td);
737 	kproc_exit(0);
738 }
739 
740 void
741 nfscl_start_renewthread(struct nfsclclient *clp)
742 {
743 
744 	kproc_create(start_nfscl, (void *)clp, &clp->nfsc_renewthread, 0, 0,
745 	    "nfscl");
746 }
747 
748 /*
749  * Handle wcc_data.
750  * For NFSv4, it assumes that nfsv4_wccattr() was used to set up the getattr
751  * as the first Op after PutFH.
752  * (For NFSv4, the postop attributes are after the Op, so they can't be
753  *  parsed here. A separate call to nfscl_postop_attr() is required.)
754  */
755 int
756 nfscl_wcc_data(struct nfsrv_descript *nd, struct vnode *vp,
757     struct nfsvattr *nap, int *flagp, int *wccflagp, void *stuff)
758 {
759 	u_int32_t *tl;
760 	struct nfsnode *np = VTONFS(vp);
761 	struct nfsvattr nfsva;
762 	int error = 0;
763 
764 	if (wccflagp != NULL)
765 		*wccflagp = 0;
766 	if (nd->nd_flag & ND_NFSV3) {
767 		*flagp = 0;
768 		NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
769 		if (*tl == newnfs_true) {
770 			NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
771 			if (wccflagp != NULL) {
772 				NFSLOCKNODE(np);
773 				*wccflagp = (np->n_mtime.tv_sec ==
774 				    fxdr_unsigned(u_int32_t, *(tl + 2)) &&
775 				    np->n_mtime.tv_nsec ==
776 				    fxdr_unsigned(u_int32_t, *(tl + 3)));
777 				NFSUNLOCKNODE(np);
778 			}
779 		}
780 		error = nfscl_postop_attr(nd, nap, flagp, stuff);
781 		if (wccflagp != NULL && *flagp == 0)
782 			*wccflagp = 0;
783 	} else if ((nd->nd_flag & (ND_NOMOREDATA | ND_NFSV4 | ND_V4WCCATTR))
784 	    == (ND_NFSV4 | ND_V4WCCATTR)) {
785 		error = nfsv4_loadattr(nd, NULL, &nfsva, NULL,
786 		    NULL, 0, NULL, NULL, NULL, NULL, NULL, 0,
787 		    NULL, NULL, NULL, NULL, NULL);
788 		if (error)
789 			return (error);
790 		/*
791 		 * Get rid of Op# and status for next op.
792 		 */
793 		NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
794 		if (*++tl)
795 			nd->nd_flag |= ND_NOMOREDATA;
796 		if (wccflagp != NULL &&
797 		    nfsva.na_vattr.va_mtime.tv_sec != 0) {
798 			NFSLOCKNODE(np);
799 			*wccflagp = (np->n_mtime.tv_sec ==
800 			    nfsva.na_vattr.va_mtime.tv_sec &&
801 			    np->n_mtime.tv_nsec ==
802 			    nfsva.na_vattr.va_mtime.tv_sec);
803 			NFSUNLOCKNODE(np);
804 		}
805 	}
806 nfsmout:
807 	return (error);
808 }
809 
810 /*
811  * Get postop attributes.
812  */
813 int
814 nfscl_postop_attr(struct nfsrv_descript *nd, struct nfsvattr *nap, int *retp,
815     void *stuff)
816 {
817 	u_int32_t *tl;
818 	int error = 0;
819 
820 	*retp = 0;
821 	if (nd->nd_flag & ND_NOMOREDATA)
822 		return (error);
823 	if (nd->nd_flag & ND_NFSV3) {
824 		NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
825 		*retp = fxdr_unsigned(int, *tl);
826 	} else if (nd->nd_flag & ND_NFSV4) {
827 		/*
828 		 * For NFSv4, the postop attr are at the end, so no point
829 		 * in looking if nd_repstat != 0.
830 		 */
831 		if (!nd->nd_repstat) {
832 			NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
833 			if (*(tl + 1))
834 				/* should never happen since nd_repstat != 0 */
835 				nd->nd_flag |= ND_NOMOREDATA;
836 			else
837 				*retp = 1;
838 		}
839 	} else if (!nd->nd_repstat) {
840 		/* For NFSv2, the attributes are here iff nd_repstat == 0 */
841 		*retp = 1;
842 	}
843 	if (*retp) {
844 		error = nfsm_loadattr(nd, nap);
845 		if (error)
846 			*retp = 0;
847 	}
848 nfsmout:
849 	return (error);
850 }
851 
852 /*
853  * nfscl_request() - mostly a wrapper for newnfs_request().
854  */
855 int
856 nfscl_request(struct nfsrv_descript *nd, struct vnode *vp, NFSPROC_T *p,
857     struct ucred *cred, void *stuff)
858 {
859 	int ret, vers;
860 	struct nfsmount *nmp;
861 
862 	nmp = VFSTONFS(vp->v_mount);
863 	if (nd->nd_flag & ND_NFSV4)
864 		vers = NFS_VER4;
865 	else if (nd->nd_flag & ND_NFSV3)
866 		vers = NFS_VER3;
867 	else
868 		vers = NFS_VER2;
869 	ret = newnfs_request(nd, nmp, NULL, &nmp->nm_sockreq, vp, p, cred,
870 		NFS_PROG, vers, NULL, 1, NULL, NULL);
871 	return (ret);
872 }
873 
874 /*
875  * fill in this bsden's variant of statfs using nfsstatfs.
876  */
877 void
878 nfscl_loadsbinfo(struct nfsmount *nmp, struct nfsstatfs *sfp, void *statfs)
879 {
880 	struct statfs *sbp = (struct statfs *)statfs;
881 
882 	if (nmp->nm_flag & (NFSMNT_NFSV3 | NFSMNT_NFSV4)) {
883 		sbp->f_bsize = NFS_FABLKSIZE;
884 		sbp->f_blocks = sfp->sf_tbytes / NFS_FABLKSIZE;
885 		sbp->f_bfree = sfp->sf_fbytes / NFS_FABLKSIZE;
886 		/*
887 		 * Although sf_abytes is uint64_t and f_bavail is int64_t,
888 		 * the value after dividing by NFS_FABLKSIZE is small
889 		 * enough that it will fit in 63bits, so it is ok to
890 		 * assign it to f_bavail without fear that it will become
891 		 * negative.
892 		 */
893 		sbp->f_bavail = sfp->sf_abytes / NFS_FABLKSIZE;
894 		sbp->f_files = sfp->sf_tfiles;
895 		/* Since f_ffree is int64_t, clip it to 63bits. */
896 		if (sfp->sf_ffiles > INT64_MAX)
897 			sbp->f_ffree = INT64_MAX;
898 		else
899 			sbp->f_ffree = sfp->sf_ffiles;
900 	} else if ((nmp->nm_flag & NFSMNT_NFSV4) == 0) {
901 		/*
902 		 * The type casts to (int32_t) ensure that this code is
903 		 * compatible with the old NFS client, in that it will
904 		 * propagate bit31 to the high order bits. This may or may
905 		 * not be correct for NFSv2, but since it is a legacy
906 		 * environment, I'd rather retain backwards compatibility.
907 		 */
908 		sbp->f_bsize = (int32_t)sfp->sf_bsize;
909 		sbp->f_blocks = (int32_t)sfp->sf_blocks;
910 		sbp->f_bfree = (int32_t)sfp->sf_bfree;
911 		sbp->f_bavail = (int32_t)sfp->sf_bavail;
912 		sbp->f_files = 0;
913 		sbp->f_ffree = 0;
914 	}
915 }
916 
917 /*
918  * Use the fsinfo stuff to update the mount point.
919  */
920 void
921 nfscl_loadfsinfo(struct nfsmount *nmp, struct nfsfsinfo *fsp)
922 {
923 
924 	if ((nmp->nm_wsize == 0 || fsp->fs_wtpref < nmp->nm_wsize) &&
925 	    fsp->fs_wtpref >= NFS_FABLKSIZE)
926 		nmp->nm_wsize = (fsp->fs_wtpref + NFS_FABLKSIZE - 1) &
927 		    ~(NFS_FABLKSIZE - 1);
928 	if (fsp->fs_wtmax < nmp->nm_wsize && fsp->fs_wtmax > 0) {
929 		nmp->nm_wsize = fsp->fs_wtmax & ~(NFS_FABLKSIZE - 1);
930 		if (nmp->nm_wsize == 0)
931 			nmp->nm_wsize = fsp->fs_wtmax;
932 	}
933 	if (nmp->nm_wsize < NFS_FABLKSIZE)
934 		nmp->nm_wsize = NFS_FABLKSIZE;
935 	if ((nmp->nm_rsize == 0 || fsp->fs_rtpref < nmp->nm_rsize) &&
936 	    fsp->fs_rtpref >= NFS_FABLKSIZE)
937 		nmp->nm_rsize = (fsp->fs_rtpref + NFS_FABLKSIZE - 1) &
938 		    ~(NFS_FABLKSIZE - 1);
939 	if (fsp->fs_rtmax < nmp->nm_rsize && fsp->fs_rtmax > 0) {
940 		nmp->nm_rsize = fsp->fs_rtmax & ~(NFS_FABLKSIZE - 1);
941 		if (nmp->nm_rsize == 0)
942 			nmp->nm_rsize = fsp->fs_rtmax;
943 	}
944 	if (nmp->nm_rsize < NFS_FABLKSIZE)
945 		nmp->nm_rsize = NFS_FABLKSIZE;
946 	if ((nmp->nm_readdirsize == 0 || fsp->fs_dtpref < nmp->nm_readdirsize)
947 	    && fsp->fs_dtpref >= NFS_DIRBLKSIZ)
948 		nmp->nm_readdirsize = (fsp->fs_dtpref + NFS_DIRBLKSIZ - 1) &
949 		    ~(NFS_DIRBLKSIZ - 1);
950 	if (fsp->fs_rtmax < nmp->nm_readdirsize && fsp->fs_rtmax > 0) {
951 		nmp->nm_readdirsize = fsp->fs_rtmax & ~(NFS_DIRBLKSIZ - 1);
952 		if (nmp->nm_readdirsize == 0)
953 			nmp->nm_readdirsize = fsp->fs_rtmax;
954 	}
955 	if (nmp->nm_readdirsize < NFS_DIRBLKSIZ)
956 		nmp->nm_readdirsize = NFS_DIRBLKSIZ;
957 	if (fsp->fs_maxfilesize > 0 &&
958 	    fsp->fs_maxfilesize < nmp->nm_maxfilesize)
959 		nmp->nm_maxfilesize = fsp->fs_maxfilesize;
960 	nmp->nm_mountp->mnt_stat.f_iosize = newnfs_iosize(nmp);
961 	nmp->nm_state |= NFSSTA_GOTFSINFO;
962 }
963 
964 /*
965  * Lookups source address which should be used to communicate with
966  * @nmp and stores it inside @pdst.
967  *
968  * Returns 0 on success.
969  */
970 u_int8_t *
971 nfscl_getmyip(struct nfsmount *nmp, struct in6_addr *paddr, int *isinet6p)
972 {
973 #if defined(INET6) || defined(INET)
974 	int fibnum;
975 
976 	fibnum = curthread->td_proc->p_fibnum;
977 #endif
978 #ifdef INET
979 	if (nmp->nm_nam->sa_family == AF_INET) {
980 		struct epoch_tracker et;
981 		struct nhop_object *nh;
982 		struct sockaddr_in *sin;
983 		struct in_addr addr = {};
984 
985 		sin = (struct sockaddr_in *)nmp->nm_nam;
986 		NET_EPOCH_ENTER(et);
987 		CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
988 		nh = fib4_lookup(fibnum, sin->sin_addr, 0, NHR_NONE, 0);
989 		CURVNET_RESTORE();
990 		if (nh != NULL)
991 			addr = IA_SIN(ifatoia(nh->nh_ifa))->sin_addr;
992 		NET_EPOCH_EXIT(et);
993 		if (nh == NULL)
994 			return (NULL);
995 
996 		if (IN_LOOPBACK(ntohl(addr.s_addr))) {
997 			/* Ignore loopback addresses */
998 			return (NULL);
999 		}
1000 
1001 		*isinet6p = 0;
1002 		*((struct in_addr *)paddr) = addr;
1003 
1004 		return (u_int8_t *)paddr;
1005 	}
1006 #endif
1007 #ifdef INET6
1008 	if (nmp->nm_nam->sa_family == AF_INET6) {
1009 		struct sockaddr_in6 *sin6;
1010 		int error;
1011 
1012 		sin6 = (struct sockaddr_in6 *)nmp->nm_nam;
1013 
1014 		CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
1015 		error = in6_selectsrc_addr(fibnum, &sin6->sin6_addr,
1016 		    sin6->sin6_scope_id, NULL, paddr, NULL);
1017 		CURVNET_RESTORE();
1018 		if (error != 0)
1019 			return (NULL);
1020 
1021 		if (IN6_IS_ADDR_LOOPBACK(paddr))
1022 			return (NULL);
1023 
1024 		/* Scope is embedded in */
1025 		*isinet6p = 1;
1026 
1027 		return (u_int8_t *)paddr;
1028 	}
1029 #endif
1030 	return (NULL);
1031 }
1032 
1033 /*
1034  * Copy NFS uid, gids from the cred structure.
1035  */
1036 void
1037 newnfs_copyincred(struct ucred *cr, struct nfscred *nfscr)
1038 {
1039 	int i;
1040 
1041 	KASSERT(cr->cr_ngroups >= 0,
1042 	    ("newnfs_copyincred: negative cr_ngroups"));
1043 	nfscr->nfsc_uid = cr->cr_uid;
1044 	nfscr->nfsc_ngroups = MIN(cr->cr_ngroups, NFS_MAXGRPS + 1);
1045 	for (i = 0; i < nfscr->nfsc_ngroups; i++)
1046 		nfscr->nfsc_groups[i] = cr->cr_groups[i];
1047 }
1048 
1049 /*
1050  * Do any client specific initialization.
1051  */
1052 void
1053 nfscl_init(void)
1054 {
1055 	static int inited = 0;
1056 
1057 	if (inited)
1058 		return;
1059 	inited = 1;
1060 	nfscl_inited = 1;
1061 	ncl_pbuf_zone = pbuf_zsecond_create("nfspbuf", nswbuf / 2);
1062 }
1063 
1064 /*
1065  * Check each of the attributes to be set, to ensure they aren't already
1066  * the correct value. Disable setting ones already correct.
1067  */
1068 int
1069 nfscl_checksattr(struct vattr *vap, struct nfsvattr *nvap)
1070 {
1071 
1072 	if (vap->va_mode != (mode_t)VNOVAL) {
1073 		if (vap->va_mode == nvap->na_mode)
1074 			vap->va_mode = (mode_t)VNOVAL;
1075 	}
1076 	if (vap->va_uid != (uid_t)VNOVAL) {
1077 		if (vap->va_uid == nvap->na_uid)
1078 			vap->va_uid = (uid_t)VNOVAL;
1079 	}
1080 	if (vap->va_gid != (gid_t)VNOVAL) {
1081 		if (vap->va_gid == nvap->na_gid)
1082 			vap->va_gid = (gid_t)VNOVAL;
1083 	}
1084 	if (vap->va_size != VNOVAL) {
1085 		if (vap->va_size == nvap->na_size)
1086 			vap->va_size = VNOVAL;
1087 	}
1088 
1089 	/*
1090 	 * We are normally called with only a partially initialized
1091 	 * VAP.  Since the NFSv3 spec says that server may use the
1092 	 * file attributes to store the verifier, the spec requires
1093 	 * us to do a SETATTR RPC. FreeBSD servers store the verifier
1094 	 * in atime, but we can't really assume that all servers will
1095 	 * so we ensure that our SETATTR sets both atime and mtime.
1096 	 * Set the VA_UTIMES_NULL flag for this case, so that
1097 	 * the server's time will be used.  This is needed to
1098 	 * work around a bug in some Solaris servers, where
1099 	 * setting the time TOCLIENT causes the Setattr RPC
1100 	 * to return NFS_OK, but not set va_mode.
1101 	 */
1102 	if (vap->va_mtime.tv_sec == VNOVAL) {
1103 		vfs_timestamp(&vap->va_mtime);
1104 		vap->va_vaflags |= VA_UTIMES_NULL;
1105 	}
1106 	if (vap->va_atime.tv_sec == VNOVAL)
1107 		vap->va_atime = vap->va_mtime;
1108 	return (1);
1109 }
1110 
1111 /*
1112  * Map nfsv4 errors to errno.h errors.
1113  * The uid and gid arguments are only used for NFSERR_BADOWNER and that
1114  * error should only be returned for the Open, Create and Setattr Ops.
1115  * As such, most calls can just pass in 0 for those arguments.
1116  */
1117 int
1118 nfscl_maperr(struct thread *td, int error, uid_t uid, gid_t gid)
1119 {
1120 	struct proc *p;
1121 
1122 	if (error < 10000 || error >= NFSERR_STALEWRITEVERF)
1123 		return (error);
1124 	if (td != NULL)
1125 		p = td->td_proc;
1126 	else
1127 		p = NULL;
1128 	switch (error) {
1129 	case NFSERR_BADOWNER:
1130 		tprintf(p, LOG_INFO,
1131 		    "No name and/or group mapping for uid,gid:(%d,%d)\n",
1132 		    uid, gid);
1133 		return (EPERM);
1134 	case NFSERR_BADNAME:
1135 	case NFSERR_BADCHAR:
1136 		printf("nfsv4 char/name not handled by server\n");
1137 		return (ENOENT);
1138 	case NFSERR_STALECLIENTID:
1139 	case NFSERR_STALESTATEID:
1140 	case NFSERR_EXPIRED:
1141 	case NFSERR_BADSTATEID:
1142 	case NFSERR_BADSESSION:
1143 		printf("nfsv4 recover err returned %d\n", error);
1144 		return (EIO);
1145 	case NFSERR_BADHANDLE:
1146 	case NFSERR_SERVERFAULT:
1147 	case NFSERR_BADTYPE:
1148 	case NFSERR_FHEXPIRED:
1149 	case NFSERR_RESOURCE:
1150 	case NFSERR_MOVED:
1151 	case NFSERR_NOFILEHANDLE:
1152 	case NFSERR_MINORVERMISMATCH:
1153 	case NFSERR_OLDSTATEID:
1154 	case NFSERR_BADSEQID:
1155 	case NFSERR_LEASEMOVED:
1156 	case NFSERR_RECLAIMBAD:
1157 	case NFSERR_BADXDR:
1158 	case NFSERR_OPILLEGAL:
1159 		printf("nfsv4 client/server protocol prob err=%d\n",
1160 		    error);
1161 		return (EIO);
1162 	default:
1163 		tprintf(p, LOG_INFO, "nfsv4 err=%d\n", error);
1164 		return (EIO);
1165 	};
1166 }
1167 
1168 /*
1169  * Check to see if the process for this owner exists. Return 1 if it doesn't
1170  * and 0 otherwise.
1171  */
1172 int
1173 nfscl_procdoesntexist(u_int8_t *own)
1174 {
1175 	union {
1176 		u_int32_t	lval;
1177 		u_int8_t	cval[4];
1178 	} tl;
1179 	struct proc *p;
1180 	pid_t pid;
1181 	int i, ret = 0;
1182 
1183 	/* For the single open_owner of all 0 bytes, just return 0. */
1184 	for (i = 0; i < NFSV4CL_LOCKNAMELEN; i++)
1185 		if (own[i] != 0)
1186 			break;
1187 	if (i == NFSV4CL_LOCKNAMELEN)
1188 		return (0);
1189 
1190 	tl.cval[0] = *own++;
1191 	tl.cval[1] = *own++;
1192 	tl.cval[2] = *own++;
1193 	tl.cval[3] = *own++;
1194 	pid = tl.lval;
1195 	p = pfind_any_locked(pid);
1196 	if (p == NULL)
1197 		return (1);
1198 	if (p->p_stats == NULL) {
1199 		PROC_UNLOCK(p);
1200 		return (0);
1201 	}
1202 	tl.cval[0] = *own++;
1203 	tl.cval[1] = *own++;
1204 	tl.cval[2] = *own++;
1205 	tl.cval[3] = *own++;
1206 	if (tl.lval != p->p_stats->p_start.tv_sec) {
1207 		ret = 1;
1208 	} else {
1209 		tl.cval[0] = *own++;
1210 		tl.cval[1] = *own++;
1211 		tl.cval[2] = *own++;
1212 		tl.cval[3] = *own;
1213 		if (tl.lval != p->p_stats->p_start.tv_usec)
1214 			ret = 1;
1215 	}
1216 	PROC_UNLOCK(p);
1217 	return (ret);
1218 }
1219 
1220 /*
1221  * - nfs pseudo system call for the client
1222  */
1223 /*
1224  * MPSAFE
1225  */
1226 static int
1227 nfssvc_nfscl(struct thread *td, struct nfssvc_args *uap)
1228 {
1229 	struct file *fp;
1230 	struct nfscbd_args nfscbdarg;
1231 	struct nfsd_nfscbd_args nfscbdarg2;
1232 	struct nameidata nd;
1233 	struct nfscl_dumpmntopts dumpmntopts;
1234 	cap_rights_t rights;
1235 	char *buf;
1236 	int error;
1237 	struct mount *mp;
1238 	struct nfsmount *nmp;
1239 
1240 	if (uap->flag & NFSSVC_CBADDSOCK) {
1241 		error = copyin(uap->argp, (caddr_t)&nfscbdarg, sizeof(nfscbdarg));
1242 		if (error)
1243 			return (error);
1244 		/*
1245 		 * Since we don't know what rights might be required,
1246 		 * pretend that we need them all. It is better to be too
1247 		 * careful than too reckless.
1248 		 */
1249 		error = fget(td, nfscbdarg.sock,
1250 		    cap_rights_init(&rights, CAP_SOCK_CLIENT), &fp);
1251 		if (error)
1252 			return (error);
1253 		if (fp->f_type != DTYPE_SOCKET) {
1254 			fdrop(fp, td);
1255 			return (EPERM);
1256 		}
1257 		error = nfscbd_addsock(fp);
1258 		fdrop(fp, td);
1259 		if (!error && nfscl_enablecallb == 0) {
1260 			nfsv4_cbport = nfscbdarg.port;
1261 			nfscl_enablecallb = 1;
1262 		}
1263 	} else if (uap->flag & NFSSVC_NFSCBD) {
1264 		if (uap->argp == NULL)
1265 			return (EINVAL);
1266 		error = copyin(uap->argp, (caddr_t)&nfscbdarg2,
1267 		    sizeof(nfscbdarg2));
1268 		if (error)
1269 			return (error);
1270 		error = nfscbd_nfsd(td, &nfscbdarg2);
1271 	} else if (uap->flag & NFSSVC_DUMPMNTOPTS) {
1272 		error = copyin(uap->argp, &dumpmntopts, sizeof(dumpmntopts));
1273 		if (error == 0 && (dumpmntopts.ndmnt_blen < 256 ||
1274 		    dumpmntopts.ndmnt_blen > 1024))
1275 			error = EINVAL;
1276 		if (error == 0)
1277 			error = nfsrv_lookupfilename(&nd,
1278 			    dumpmntopts.ndmnt_fname, td);
1279 		if (error == 0 && strcmp(nd.ni_vp->v_mount->mnt_vfc->vfc_name,
1280 		    "nfs") != 0) {
1281 			vput(nd.ni_vp);
1282 			error = EINVAL;
1283 		}
1284 		if (error == 0) {
1285 			buf = malloc(dumpmntopts.ndmnt_blen, M_TEMP, M_WAITOK);
1286 			nfscl_retopts(VFSTONFS(nd.ni_vp->v_mount), buf,
1287 			    dumpmntopts.ndmnt_blen);
1288 			vput(nd.ni_vp);
1289 			error = copyout(buf, dumpmntopts.ndmnt_buf,
1290 			    dumpmntopts.ndmnt_blen);
1291 			free(buf, M_TEMP);
1292 		}
1293 	} else if (uap->flag & NFSSVC_FORCEDISM) {
1294 		buf = malloc(MNAMELEN + 1, M_TEMP, M_WAITOK);
1295 		error = copyinstr(uap->argp, buf, MNAMELEN + 1, NULL);
1296 		if (error == 0) {
1297 			nmp = NULL;
1298 			mtx_lock(&mountlist_mtx);
1299 			TAILQ_FOREACH(mp, &mountlist, mnt_list) {
1300 				if (strcmp(mp->mnt_stat.f_mntonname, buf) ==
1301 				    0 && strcmp(mp->mnt_stat.f_fstypename,
1302 				    "nfs") == 0 && mp->mnt_data != NULL) {
1303 					nmp = VFSTONFS(mp);
1304 					NFSDDSLOCK();
1305 					if (nfsv4_findmirror(nmp) != NULL) {
1306 						NFSDDSUNLOCK();
1307 						error = ENXIO;
1308 						nmp = NULL;
1309 						break;
1310 					}
1311 					mtx_lock(&nmp->nm_mtx);
1312 					if ((nmp->nm_privflag &
1313 					    NFSMNTP_FORCEDISM) == 0) {
1314 						nmp->nm_privflag |=
1315 						   (NFSMNTP_FORCEDISM |
1316 						    NFSMNTP_CANCELRPCS);
1317 						mtx_unlock(&nmp->nm_mtx);
1318 					} else {
1319 						mtx_unlock(&nmp->nm_mtx);
1320 						nmp = NULL;
1321 					}
1322 					NFSDDSUNLOCK();
1323 					break;
1324 				}
1325 			}
1326 			mtx_unlock(&mountlist_mtx);
1327 
1328 			if (nmp != NULL) {
1329 				/*
1330 				 * Call newnfs_nmcancelreqs() to cause
1331 				 * any RPCs in progress on the mount point to
1332 				 * fail.
1333 				 * This will cause any process waiting for an
1334 				 * RPC to complete while holding a vnode lock
1335 				 * on the mounted-on vnode (such as "df" or
1336 				 * a non-forced "umount") to fail.
1337 				 * This will unlock the mounted-on vnode so
1338 				 * a forced dismount can succeed.
1339 				 * Then clear NFSMNTP_CANCELRPCS and wakeup(),
1340 				 * so that nfs_unmount() can complete.
1341 				 */
1342 				newnfs_nmcancelreqs(nmp);
1343 				mtx_lock(&nmp->nm_mtx);
1344 				nmp->nm_privflag &= ~NFSMNTP_CANCELRPCS;
1345 				wakeup(nmp);
1346 				mtx_unlock(&nmp->nm_mtx);
1347 			} else if (error == 0)
1348 				error = EINVAL;
1349 		}
1350 		free(buf, M_TEMP);
1351 	} else {
1352 		error = EINVAL;
1353 	}
1354 	return (error);
1355 }
1356 
1357 extern int (*nfsd_call_nfscl)(struct thread *, struct nfssvc_args *);
1358 
1359 /*
1360  * Called once to initialize data structures...
1361  */
1362 static int
1363 nfscl_modevent(module_t mod, int type, void *data)
1364 {
1365 	int error = 0;
1366 	static int loaded = 0;
1367 
1368 	switch (type) {
1369 	case MOD_LOAD:
1370 		if (loaded)
1371 			return (0);
1372 		newnfs_portinit();
1373 		mtx_init(&ncl_iod_mutex, "ncl_iod_mutex", NULL, MTX_DEF);
1374 		nfscl_init();
1375 		NFSD_LOCK();
1376 		nfsrvd_cbinit(0);
1377 		NFSD_UNLOCK();
1378 		ncl_call_invalcaches = ncl_invalcaches;
1379 		nfsd_call_nfscl = nfssvc_nfscl;
1380 		loaded = 1;
1381 		break;
1382 
1383 	case MOD_UNLOAD:
1384 		if (nfs_numnfscbd != 0) {
1385 			error = EBUSY;
1386 			break;
1387 		}
1388 
1389 		/*
1390 		 * XXX: Unloading of nfscl module is unsupported.
1391 		 */
1392 #if 0
1393 		ncl_call_invalcaches = NULL;
1394 		nfsd_call_nfscl = NULL;
1395 		uma_zdestroy(ncl_pbuf_zone);
1396 		/* and get rid of the mutexes */
1397 		mtx_destroy(&ncl_iod_mutex);
1398 		loaded = 0;
1399 		break;
1400 #else
1401 		/* FALLTHROUGH */
1402 #endif
1403 	default:
1404 		error = EOPNOTSUPP;
1405 		break;
1406 	}
1407 	return error;
1408 }
1409 static moduledata_t nfscl_mod = {
1410 	"nfscl",
1411 	nfscl_modevent,
1412 	NULL,
1413 };
1414 DECLARE_MODULE(nfscl, nfscl_mod, SI_SUB_VFS, SI_ORDER_FIRST);
1415 
1416 /* So that loader and kldload(2) can find us, wherever we are.. */
1417 MODULE_VERSION(nfscl, 1);
1418 MODULE_DEPEND(nfscl, nfscommon, 1, 1, 1);
1419 MODULE_DEPEND(nfscl, krpc, 1, 1, 1);
1420 MODULE_DEPEND(nfscl, nfssvc, 1, 1, 1);
1421