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_copy_file_range_t nfs_copy_file_range;
150 static vop_ioctl_t nfs_ioctl;
151 static vop_getextattr_t nfs_getextattr;
152 static vop_setextattr_t nfs_setextattr;
153 static vop_listextattr_t nfs_listextattr;
154 static vop_deleteextattr_t nfs_deleteextattr;
155 static vop_lock1_t nfs_lock;
156
157 /*
158 * Global vfs data structures for nfs
159 */
160
161 static struct vop_vector newnfs_vnodeops_nosig = {
162 .vop_default = &default_vnodeops,
163 .vop_access = nfs_access,
164 .vop_advlock = nfs_advlock,
165 .vop_advlockasync = nfs_advlockasync,
166 .vop_close = nfs_close,
167 .vop_create = nfs_create,
168 .vop_fsync = nfs_fsync,
169 .vop_getattr = nfs_getattr,
170 .vop_getpages = ncl_getpages,
171 .vop_putpages = ncl_putpages,
172 .vop_inactive = ncl_inactive,
173 .vop_link = nfs_link,
174 .vop_lock1 = nfs_lock,
175 .vop_lookup = nfs_lookup,
176 .vop_mkdir = nfs_mkdir,
177 .vop_mknod = nfs_mknod,
178 .vop_open = nfs_open,
179 .vop_pathconf = nfs_pathconf,
180 .vop_print = nfs_print,
181 .vop_read = nfs_read,
182 .vop_readdir = nfs_readdir,
183 .vop_readlink = nfs_readlink,
184 .vop_reclaim = ncl_reclaim,
185 .vop_remove = nfs_remove,
186 .vop_rename = nfs_rename,
187 .vop_rmdir = nfs_rmdir,
188 .vop_setattr = nfs_setattr,
189 .vop_strategy = nfs_strategy,
190 .vop_symlink = nfs_symlink,
191 .vop_write = ncl_write,
192 .vop_getacl = nfs_getacl,
193 .vop_setacl = nfs_setacl,
194 .vop_advise = nfs_advise,
195 .vop_allocate = nfs_allocate,
196 .vop_copy_file_range = nfs_copy_file_range,
197 .vop_ioctl = nfs_ioctl,
198 .vop_getextattr = nfs_getextattr,
199 .vop_setextattr = nfs_setextattr,
200 .vop_listextattr = nfs_listextattr,
201 .vop_deleteextattr = nfs_deleteextattr,
202 };
203 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops_nosig);
204
205 static int
206 nfs_vnodeops_bypass(struct vop_generic_args *a)
207 {
208
209 return (vop_sigdefer(&newnfs_vnodeops_nosig, a));
210 }
211
212 struct vop_vector newnfs_vnodeops = {
213 .vop_default = &default_vnodeops,
214 .vop_bypass = nfs_vnodeops_bypass,
215 };
216 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops);
217
218 static struct vop_vector newnfs_fifoops_nosig = {
219 .vop_default = &fifo_specops,
220 .vop_access = nfsspec_access,
221 .vop_close = nfsfifo_close,
222 .vop_fsync = nfs_fsync,
223 .vop_getattr = nfs_getattr,
224 .vop_inactive = ncl_inactive,
225 .vop_pathconf = nfs_pathconf,
226 .vop_print = nfs_print,
227 .vop_read = nfsfifo_read,
228 .vop_reclaim = ncl_reclaim,
229 .vop_setattr = nfs_setattr,
230 .vop_write = nfsfifo_write,
231 };
232 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops_nosig);
233
234 static int
235 nfs_fifoops_bypass(struct vop_generic_args *a)
236 {
237
238 return (vop_sigdefer(&newnfs_fifoops_nosig, a));
239 }
240
241 struct vop_vector newnfs_fifoops = {
242 .vop_default = &default_vnodeops,
243 .vop_bypass = nfs_fifoops_bypass,
244 };
245 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops);
246
247 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
248 struct componentname *cnp, struct vattr *vap);
249 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
250 int namelen, struct ucred *cred, struct thread *td);
251 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp,
252 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp,
253 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td);
254 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp,
255 struct componentname *scnp, struct sillyrename *sp);
256
257 /*
258 * Global variables
259 */
260 SYSCTL_DECL(_vfs_nfs);
261
262 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
263 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
264 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
265
266 static int nfs_prime_access_cache = 0;
267 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
268 &nfs_prime_access_cache, 0,
269 "Prime NFS ACCESS cache when fetching attributes");
270
271 static int newnfs_commit_on_close = 0;
272 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW,
273 &newnfs_commit_on_close, 0, "write+commit on close, else only write");
274
275 static int nfs_clean_pages_on_close = 1;
276 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
277 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
278
279 int newnfs_directio_enable = 0;
280 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
281 &newnfs_directio_enable, 0, "Enable NFS directio");
282
283 int nfs_keep_dirty_on_error;
284 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW,
285 &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned");
286
287 /*
288 * This sysctl allows other processes to mmap a file that has been opened
289 * O_DIRECT by a process. In general, having processes mmap the file while
290 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow
291 * this by default to prevent DoS attacks - to prevent a malicious user from
292 * opening up files O_DIRECT preventing other users from mmap'ing these
293 * files. "Protected" environments where stricter consistency guarantees are
294 * required can disable this knob. The process that opened the file O_DIRECT
295 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
296 * meaningful.
297 */
298 int newnfs_directio_allow_mmap = 1;
299 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
300 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
301
302 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \
303 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \
304 | NFSACCESS_DELETE | NFSACCESS_LOOKUP)
305
306 /*
307 * SMP Locking Note :
308 * The list of locks after the description of the lock is the ordering
309 * of other locks acquired with the lock held.
310 * np->n_mtx : Protects the fields in the nfsnode.
311 VM Object Lock
312 VI_MTX (acquired indirectly)
313 * nmp->nm_mtx : Protects the fields in the nfsmount.
314 rep->r_mtx
315 * ncl_iod_mutex : Global lock, protects shared nfsiod state.
316 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
317 nmp->nm_mtx
318 rep->r_mtx
319 * rep->r_mtx : Protects the fields in an nfsreq.
320 */
321
322 static int
323 nfs_lock(struct vop_lock1_args *ap)
324 {
325 struct vnode *vp;
326 struct nfsnode *np;
327 u_quad_t nsize;
328 int error, lktype;
329 bool onfault;
330
331 vp = ap->a_vp;
332 lktype = ap->a_flags & LK_TYPE_MASK;
333 error = VOP_LOCK1_APV(&default_vnodeops, ap);
334 if (error != 0 || vp->v_op != &newnfs_vnodeops)
335 return (error);
336 np = VTONFS(vp);
337 if (np == NULL)
338 return (0);
339 NFSLOCKNODE(np);
340 if ((np->n_flag & NVNSETSZSKIP) == 0 || (lktype != LK_SHARED &&
341 lktype != LK_EXCLUSIVE && lktype != LK_UPGRADE &&
342 lktype != LK_TRYUPGRADE)) {
343 NFSUNLOCKNODE(np);
344 return (0);
345 }
346 onfault = (ap->a_flags & LK_EATTR_MASK) == LK_NOWAIT &&
347 (ap->a_flags & LK_INIT_MASK) == LK_CANRECURSE &&
348 (lktype == LK_SHARED || lktype == LK_EXCLUSIVE);
349 if (onfault && vp->v_vnlock->lk_recurse == 0) {
350 /*
351 * Force retry in vm_fault(), to make the lock request
352 * sleepable, which allows us to piggy-back the
353 * sleepable call to vnode_pager_setsize().
354 */
355 NFSUNLOCKNODE(np);
356 VOP_UNLOCK(vp);
357 return (EBUSY);
358 }
359 if ((ap->a_flags & LK_NOWAIT) != 0 ||
360 (lktype == LK_SHARED && vp->v_vnlock->lk_recurse > 0)) {
361 NFSUNLOCKNODE(np);
362 return (0);
363 }
364 if (lktype == LK_SHARED) {
365 NFSUNLOCKNODE(np);
366 VOP_UNLOCK(vp);
367 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK);
368 ap->a_flags |= LK_EXCLUSIVE;
369 error = VOP_LOCK1_APV(&default_vnodeops, ap);
370 if (error != 0 || vp->v_op != &newnfs_vnodeops)
371 return (error);
372 if (vp->v_data == NULL)
373 goto downgrade;
374 MPASS(vp->v_data == np);
375 NFSLOCKNODE(np);
376 if ((np->n_flag & NVNSETSZSKIP) == 0) {
377 NFSUNLOCKNODE(np);
378 goto downgrade;
379 }
380 }
381 np->n_flag &= ~NVNSETSZSKIP;
382 nsize = np->n_size;
383 NFSUNLOCKNODE(np);
384 vnode_pager_setsize(vp, nsize);
385 downgrade:
386 if (lktype == LK_SHARED) {
387 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK);
388 ap->a_flags |= LK_DOWNGRADE;
389 (void)VOP_LOCK1_APV(&default_vnodeops, ap);
390 }
391 return (0);
392 }
393
394 static int
395 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td,
396 struct ucred *cred, u_int32_t *retmode)
397 {
398 int error = 0, attrflag, i, lrupos;
399 u_int32_t rmode;
400 struct nfsnode *np = VTONFS(vp);
401 struct nfsvattr nfsva;
402
403 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag,
404 &rmode, NULL);
405 if (attrflag)
406 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
407 if (!error) {
408 lrupos = 0;
409 NFSLOCKNODE(np);
410 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
411 if (np->n_accesscache[i].uid == cred->cr_uid) {
412 np->n_accesscache[i].mode = rmode;
413 np->n_accesscache[i].stamp = time_second;
414 break;
415 }
416 if (i > 0 && np->n_accesscache[i].stamp <
417 np->n_accesscache[lrupos].stamp)
418 lrupos = i;
419 }
420 if (i == NFS_ACCESSCACHESIZE) {
421 np->n_accesscache[lrupos].uid = cred->cr_uid;
422 np->n_accesscache[lrupos].mode = rmode;
423 np->n_accesscache[lrupos].stamp = time_second;
424 }
425 NFSUNLOCKNODE(np);
426 if (retmode != NULL)
427 *retmode = rmode;
428 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0);
429 } else if (NFS_ISV4(vp)) {
430 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
431 }
432 #ifdef KDTRACE_HOOKS
433 if (error != 0)
434 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0,
435 error);
436 #endif
437 return (error);
438 }
439
440 /*
441 * nfs access vnode op.
442 * For nfs version 2, just return ok. File accesses may fail later.
443 * For nfs version 3, use the access rpc to check accessibility. If file modes
444 * are changed on the server, accesses might still fail later.
445 */
446 static int
447 nfs_access(struct vop_access_args *ap)
448 {
449 struct vnode *vp = ap->a_vp;
450 int error = 0, i, gotahit;
451 u_int32_t mode, wmode, rmode;
452 int v34 = NFS_ISV34(vp);
453 struct nfsnode *np = VTONFS(vp);
454
455 /*
456 * Disallow write attempts on filesystems mounted read-only;
457 * unless the file is a socket, fifo, or a block or character
458 * device resident on the filesystem.
459 */
460 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS |
461 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL |
462 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) {
463 switch (vp->v_type) {
464 case VREG:
465 case VDIR:
466 case VLNK:
467 return (EROFS);
468 default:
469 break;
470 }
471 }
472 /*
473 * For nfs v3 or v4, check to see if we have done this recently, and if
474 * so return our cached result instead of making an ACCESS call.
475 * If not, do an access rpc, otherwise you are stuck emulating
476 * ufs_access() locally using the vattr. This may not be correct,
477 * since the server may apply other access criteria such as
478 * client uid-->server uid mapping that we do not know about.
479 */
480 if (v34) {
481 if (ap->a_accmode & VREAD)
482 mode = NFSACCESS_READ;
483 else
484 mode = 0;
485 if (vp->v_type != VDIR) {
486 if (ap->a_accmode & VWRITE)
487 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
488 if (ap->a_accmode & VAPPEND)
489 mode |= NFSACCESS_EXTEND;
490 if (ap->a_accmode & VEXEC)
491 mode |= NFSACCESS_EXECUTE;
492 if (ap->a_accmode & VDELETE)
493 mode |= NFSACCESS_DELETE;
494 } else {
495 if (ap->a_accmode & VWRITE)
496 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
497 if (ap->a_accmode & VAPPEND)
498 mode |= NFSACCESS_EXTEND;
499 if (ap->a_accmode & VEXEC)
500 mode |= NFSACCESS_LOOKUP;
501 if (ap->a_accmode & VDELETE)
502 mode |= NFSACCESS_DELETE;
503 if (ap->a_accmode & VDELETE_CHILD)
504 mode |= NFSACCESS_MODIFY;
505 }
506 /* XXX safety belt, only make blanket request if caching */
507 if (nfsaccess_cache_timeout > 0) {
508 wmode = NFSACCESS_READ | NFSACCESS_MODIFY |
509 NFSACCESS_EXTEND | NFSACCESS_EXECUTE |
510 NFSACCESS_DELETE | NFSACCESS_LOOKUP;
511 } else {
512 wmode = mode;
513 }
514
515 /*
516 * Does our cached result allow us to give a definite yes to
517 * this request?
518 */
519 gotahit = 0;
520 NFSLOCKNODE(np);
521 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
522 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
523 if (time_second < (np->n_accesscache[i].stamp
524 + nfsaccess_cache_timeout) &&
525 (np->n_accesscache[i].mode & mode) == mode) {
526 NFSINCRGLOBAL(nfsstatsv1.accesscache_hits);
527 gotahit = 1;
528 }
529 break;
530 }
531 }
532 NFSUNLOCKNODE(np);
533 #ifdef KDTRACE_HOOKS
534 if (gotahit != 0)
535 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp,
536 ap->a_cred->cr_uid, mode);
537 else
538 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp,
539 ap->a_cred->cr_uid, mode);
540 #endif
541 if (gotahit == 0) {
542 /*
543 * Either a no, or a don't know. Go to the wire.
544 */
545 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses);
546 error = nfs34_access_otw(vp, wmode, ap->a_td,
547 ap->a_cred, &rmode);
548 if (!error &&
549 (rmode & mode) != mode)
550 error = EACCES;
551 }
552 return (error);
553 } else {
554 if ((error = nfsspec_access(ap)) != 0) {
555 return (error);
556 }
557 /*
558 * Attempt to prevent a mapped root from accessing a file
559 * which it shouldn't. We try to read a byte from the file
560 * if the user is root and the file is not zero length.
561 * After calling nfsspec_access, we should have the correct
562 * file size cached.
563 */
564 NFSLOCKNODE(np);
565 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
566 && VTONFS(vp)->n_size > 0) {
567 struct iovec aiov;
568 struct uio auio;
569 char buf[1];
570
571 NFSUNLOCKNODE(np);
572 aiov.iov_base = buf;
573 aiov.iov_len = 1;
574 auio.uio_iov = &aiov;
575 auio.uio_iovcnt = 1;
576 auio.uio_offset = 0;
577 auio.uio_resid = 1;
578 auio.uio_segflg = UIO_SYSSPACE;
579 auio.uio_rw = UIO_READ;
580 auio.uio_td = ap->a_td;
581
582 if (vp->v_type == VREG)
583 error = ncl_readrpc(vp, &auio, ap->a_cred);
584 else if (vp->v_type == VDIR) {
585 char* bp;
586 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
587 aiov.iov_base = bp;
588 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
589 error = ncl_readdirrpc(vp, &auio, ap->a_cred,
590 ap->a_td);
591 free(bp, M_TEMP);
592 } else if (vp->v_type == VLNK)
593 error = ncl_readlinkrpc(vp, &auio, ap->a_cred);
594 else
595 error = EACCES;
596 } else
597 NFSUNLOCKNODE(np);
598 return (error);
599 }
600 }
601
602 /*
603 * nfs open vnode op
604 * Check to see if the type is ok
605 * and that deletion is not in progress.
606 * For paged in text files, you will need to flush the page cache
607 * if consistency is lost.
608 */
609 /* ARGSUSED */
610 static int
611 nfs_open(struct vop_open_args *ap)
612 {
613 struct vnode *vp = ap->a_vp;
614 struct nfsnode *np = VTONFS(vp);
615 struct vattr vattr;
616 int error;
617 int fmode = ap->a_mode;
618 struct ucred *cred;
619 vm_object_t obj;
620
621 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
622 return (EOPNOTSUPP);
623
624 /*
625 * For NFSv4, we need to do the Open Op before cache validation,
626 * so that we conform to RFC3530 Sec. 9.3.1.
627 */
628 if (NFS_ISV4(vp)) {
629 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);
630 if (error) {
631 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
632 (gid_t)0);
633 return (error);
634 }
635 }
636
637 /*
638 * Now, if this Open will be doing reading, re-validate/flush the
639 * cache, so that Close/Open coherency is maintained.
640 */
641 NFSLOCKNODE(np);
642 if (np->n_flag & NMODIFIED) {
643 NFSUNLOCKNODE(np);
644 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
645 if (error == EINTR || error == EIO) {
646 if (NFS_ISV4(vp))
647 (void) nfsrpc_close(vp, 0, ap->a_td);
648 return (error);
649 }
650 NFSLOCKNODE(np);
651 np->n_attrstamp = 0;
652 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
653 if (vp->v_type == VDIR)
654 np->n_direofoffset = 0;
655 NFSUNLOCKNODE(np);
656 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
657 if (error) {
658 if (NFS_ISV4(vp))
659 (void) nfsrpc_close(vp, 0, ap->a_td);
660 return (error);
661 }
662 NFSLOCKNODE(np);
663 np->n_mtime = vattr.va_mtime;
664 if (NFS_ISV4(vp))
665 np->n_change = vattr.va_filerev;
666 } else {
667 NFSUNLOCKNODE(np);
668 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
669 if (error) {
670 if (NFS_ISV4(vp))
671 (void) nfsrpc_close(vp, 0, ap->a_td);
672 return (error);
673 }
674 NFSLOCKNODE(np);
675 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) ||
676 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
677 if (vp->v_type == VDIR)
678 np->n_direofoffset = 0;
679 NFSUNLOCKNODE(np);
680 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
681 if (error == EINTR || error == EIO) {
682 if (NFS_ISV4(vp))
683 (void) nfsrpc_close(vp, 0, ap->a_td);
684 return (error);
685 }
686 NFSLOCKNODE(np);
687 np->n_mtime = vattr.va_mtime;
688 if (NFS_ISV4(vp))
689 np->n_change = vattr.va_filerev;
690 }
691 }
692
693 /*
694 * If the object has >= 1 O_DIRECT active opens, we disable caching.
695 */
696 if (newnfs_directio_enable && (fmode & O_DIRECT) &&
697 (vp->v_type == VREG)) {
698 if (np->n_directio_opens == 0) {
699 NFSUNLOCKNODE(np);
700 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
701 if (error) {
702 if (NFS_ISV4(vp))
703 (void) nfsrpc_close(vp, 0, ap->a_td);
704 return (error);
705 }
706 NFSLOCKNODE(np);
707 np->n_flag |= NNONCACHE;
708 }
709 np->n_directio_opens++;
710 }
711
712 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */
713 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0)
714 np->n_flag |= NWRITEOPENED;
715
716 /*
717 * If this is an open for writing, capture a reference to the
718 * credentials, so they can be used by ncl_putpages(). Using
719 * these write credentials is preferable to the credentials of
720 * whatever thread happens to be doing the VOP_PUTPAGES() since
721 * the write RPCs are less likely to fail with EACCES.
722 */
723 if ((fmode & FWRITE) != 0) {
724 cred = np->n_writecred;
725 np->n_writecred = crhold(ap->a_cred);
726 } else
727 cred = NULL;
728 NFSUNLOCKNODE(np);
729
730 if (cred != NULL)
731 crfree(cred);
732 vnode_create_vobject(vp, vattr.va_size, ap->a_td);
733
734 /*
735 * If the text file has been mmap'd, flush any dirty pages to the
736 * buffer cache and then...
737 * Make sure all writes are pushed to the NFS server. If this is not
738 * done, the modify time of the file can change while the text
739 * file is being executed. This will cause the process that is
740 * executing the text file to be terminated.
741 */
742 if (vp->v_writecount <= -1) {
743 if ((obj = vp->v_object) != NULL &&
744 vm_object_mightbedirty(obj)) {
745 VM_OBJECT_WLOCK(obj);
746 vm_object_page_clean(obj, 0, 0, OBJPC_SYNC);
747 VM_OBJECT_WUNLOCK(obj);
748 }
749
750 /* Now, flush the buffer cache. */
751 ncl_flush(vp, MNT_WAIT, curthread, 0, 0);
752
753 /* And, finally, make sure that n_mtime is up to date. */
754 np = VTONFS(vp);
755 NFSLOCKNODE(np);
756 np->n_mtime = np->n_vattr.na_mtime;
757 NFSUNLOCKNODE(np);
758 }
759 return (0);
760 }
761
762 /*
763 * nfs close vnode op
764 * What an NFS client should do upon close after writing is a debatable issue.
765 * Most NFS clients push delayed writes to the server upon close, basically for
766 * two reasons:
767 * 1 - So that any write errors may be reported back to the client process
768 * doing the close system call. By far the two most likely errors are
769 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
770 * 2 - To put a worst case upper bound on cache inconsistency between
771 * multiple clients for the file.
772 * There is also a consistency problem for Version 2 of the protocol w.r.t.
773 * not being able to tell if other clients are writing a file concurrently,
774 * since there is no way of knowing if the changed modify time in the reply
775 * is only due to the write for this client.
776 * (NFS Version 3 provides weak cache consistency data in the reply that
777 * should be sufficient to detect and handle this case.)
778 *
779 * The current code does the following:
780 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
781 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
782 * or commit them (this satisfies 1 and 2 except for the
783 * case where the server crashes after this close but
784 * before the commit RPC, which is felt to be "good
785 * enough". Changing the last argument to ncl_flush() to
786 * a 1 would force a commit operation, if it is felt a
787 * commit is necessary now.
788 * for NFS Version 4 - flush the dirty buffers and commit them, if
789 * nfscl_mustflush() says this is necessary.
790 * It is necessary if there is no write delegation held,
791 * in order to satisfy open/close coherency.
792 * If the file isn't cached on local stable storage,
793 * it may be necessary in order to detect "out of space"
794 * errors from the server, if the write delegation
795 * issued by the server doesn't allow the file to grow.
796 */
797 /* ARGSUSED */
798 static int
799 nfs_close(struct vop_close_args *ap)
800 {
801 struct vnode *vp = ap->a_vp;
802 struct nfsnode *np = VTONFS(vp);
803 struct nfsvattr nfsva;
804 struct ucred *cred;
805 int error = 0, ret, localcred = 0;
806 int fmode = ap->a_fflag;
807
808 if (NFSCL_FORCEDISM(vp->v_mount))
809 return (0);
810 /*
811 * During shutdown, a_cred isn't valid, so just use root.
812 */
813 if (ap->a_cred == NOCRED) {
814 cred = newnfs_getcred();
815 localcred = 1;
816 } else {
817 cred = ap->a_cred;
818 }
819 if (vp->v_type == VREG) {
820 /*
821 * Examine and clean dirty pages, regardless of NMODIFIED.
822 * This closes a major hole in close-to-open consistency.
823 * We want to push out all dirty pages (and buffers) on
824 * close, regardless of whether they were dirtied by
825 * mmap'ed writes or via write().
826 */
827 if (nfs_clean_pages_on_close && vp->v_object) {
828 VM_OBJECT_WLOCK(vp->v_object);
829 vm_object_page_clean(vp->v_object, 0, 0, 0);
830 VM_OBJECT_WUNLOCK(vp->v_object);
831 }
832 NFSLOCKNODE(np);
833 if (np->n_flag & NMODIFIED) {
834 NFSUNLOCKNODE(np);
835 if (NFS_ISV3(vp)) {
836 /*
837 * Under NFSv3 we have dirty buffers to dispose of. We
838 * must flush them to the NFS server. We have the option
839 * of waiting all the way through the commit rpc or just
840 * waiting for the initial write. The default is to only
841 * wait through the initial write so the data is in the
842 * server's cache, which is roughly similar to the state
843 * a standard disk subsystem leaves the file in on close().
844 *
845 * We cannot clear the NMODIFIED bit in np->n_flag due to
846 * potential races with other processes, and certainly
847 * cannot clear it if we don't commit.
848 * These races occur when there is no longer the old
849 * traditional vnode locking implemented for Vnode Ops.
850 */
851 int cm = newnfs_commit_on_close ? 1 : 0;
852 error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0);
853 /* np->n_flag &= ~NMODIFIED; */
854 } else if (NFS_ISV4(vp)) {
855 if (nfscl_mustflush(vp) != 0) {
856 int cm = newnfs_commit_on_close ? 1 : 0;
857 error = ncl_flush(vp, MNT_WAIT, ap->a_td,
858 cm, 0);
859 /*
860 * as above w.r.t races when clearing
861 * NMODIFIED.
862 * np->n_flag &= ~NMODIFIED;
863 */
864 }
865 } else {
866 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
867 }
868 NFSLOCKNODE(np);
869 }
870 /*
871 * Invalidate the attribute cache in all cases.
872 * An open is going to fetch fresh attrs any way, other procs
873 * on this node that have file open will be forced to do an
874 * otw attr fetch, but this is safe.
875 * --> A user found that their RPC count dropped by 20% when
876 * this was commented out and I can't see any requirement
877 * for it, so I've disabled it when negative lookups are
878 * enabled. (What does this have to do with negative lookup
879 * caching? Well nothing, except it was reported by the
880 * same user that needed negative lookup caching and I wanted
881 * there to be a way to disable it to see if it
882 * is the cause of some caching/coherency issue that might
883 * crop up.)
884 */
885 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) {
886 np->n_attrstamp = 0;
887 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
888 }
889 if (np->n_flag & NWRITEERR) {
890 np->n_flag &= ~NWRITEERR;
891 error = np->n_error;
892 }
893 NFSUNLOCKNODE(np);
894 }
895
896 if (NFS_ISV4(vp)) {
897 /*
898 * Get attributes so "change" is up to date.
899 */
900 if (error == 0 && nfscl_mustflush(vp) != 0 &&
901 vp->v_type == VREG &&
902 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) {
903 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
904 NULL);
905 if (!ret) {
906 np->n_change = nfsva.na_filerev;
907 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
908 NULL, 0, 0);
909 }
910 }
911
912 /*
913 * and do the close.
914 */
915 ret = nfsrpc_close(vp, 0, ap->a_td);
916 if (!error && ret)
917 error = ret;
918 if (error)
919 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
920 (gid_t)0);
921 }
922 if (newnfs_directio_enable)
923 KASSERT((np->n_directio_asyncwr == 0),
924 ("nfs_close: dirty unflushed (%d) directio buffers\n",
925 np->n_directio_asyncwr));
926 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
927 NFSLOCKNODE(np);
928 KASSERT((np->n_directio_opens > 0),
929 ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
930 np->n_directio_opens--;
931 if (np->n_directio_opens == 0)
932 np->n_flag &= ~NNONCACHE;
933 NFSUNLOCKNODE(np);
934 }
935 if (localcred)
936 NFSFREECRED(cred);
937 return (error);
938 }
939
940 /*
941 * nfs getattr call from vfs.
942 */
943 static int
944 nfs_getattr(struct vop_getattr_args *ap)
945 {
946 struct vnode *vp = ap->a_vp;
947 struct thread *td = curthread; /* XXX */
948 struct nfsnode *np = VTONFS(vp);
949 int error = 0;
950 struct nfsvattr nfsva;
951 struct vattr *vap = ap->a_vap;
952 struct vattr vattr;
953
954 /*
955 * Update local times for special files.
956 */
957 NFSLOCKNODE(np);
958 if (np->n_flag & (NACC | NUPD))
959 np->n_flag |= NCHG;
960 NFSUNLOCKNODE(np);
961 /*
962 * First look in the cache.
963 */
964 if (ncl_getattrcache(vp, &vattr) == 0) {
965 vap->va_type = vattr.va_type;
966 vap->va_mode = vattr.va_mode;
967 vap->va_nlink = vattr.va_nlink;
968 vap->va_uid = vattr.va_uid;
969 vap->va_gid = vattr.va_gid;
970 vap->va_fsid = vattr.va_fsid;
971 vap->va_fileid = vattr.va_fileid;
972 vap->va_size = vattr.va_size;
973 vap->va_blocksize = vattr.va_blocksize;
974 vap->va_atime = vattr.va_atime;
975 vap->va_mtime = vattr.va_mtime;
976 vap->va_ctime = vattr.va_ctime;
977 vap->va_gen = vattr.va_gen;
978 vap->va_flags = vattr.va_flags;
979 vap->va_rdev = vattr.va_rdev;
980 vap->va_bytes = vattr.va_bytes;
981 vap->va_filerev = vattr.va_filerev;
982 /*
983 * Get the local modify time for the case of a write
984 * delegation.
985 */
986 nfscl_deleggetmodtime(vp, &vap->va_mtime);
987 return (0);
988 }
989
990 if (NFS_ISV34(vp) && nfs_prime_access_cache &&
991 nfsaccess_cache_timeout > 0) {
992 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses);
993 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
994 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
995 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
996 return (0);
997 }
998 }
999 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
1000 if (!error)
1001 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0);
1002 if (!error) {
1003 /*
1004 * Get the local modify time for the case of a write
1005 * delegation.
1006 */
1007 nfscl_deleggetmodtime(vp, &vap->va_mtime);
1008 } else if (NFS_ISV4(vp)) {
1009 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1010 }
1011 return (error);
1012 }
1013
1014 /*
1015 * nfs setattr call.
1016 */
1017 static int
1018 nfs_setattr(struct vop_setattr_args *ap)
1019 {
1020 struct vnode *vp = ap->a_vp;
1021 struct nfsnode *np = VTONFS(vp);
1022 struct thread *td = curthread; /* XXX */
1023 struct vattr *vap = ap->a_vap;
1024 int error = 0;
1025 u_quad_t tsize;
1026
1027 #ifndef nolint
1028 tsize = (u_quad_t)0;
1029 #endif
1030
1031 /*
1032 * Setting of flags and marking of atimes are not supported.
1033 */
1034 if (vap->va_flags != VNOVAL)
1035 return (EOPNOTSUPP);
1036
1037 /*
1038 * Disallow write attempts if the filesystem is mounted read-only.
1039 */
1040 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
1041 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
1042 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
1043 (vp->v_mount->mnt_flag & MNT_RDONLY))
1044 return (EROFS);
1045 if (vap->va_size != VNOVAL) {
1046 switch (vp->v_type) {
1047 case VDIR:
1048 return (EISDIR);
1049 case VCHR:
1050 case VBLK:
1051 case VSOCK:
1052 case VFIFO:
1053 if (vap->va_mtime.tv_sec == VNOVAL &&
1054 vap->va_atime.tv_sec == VNOVAL &&
1055 vap->va_mode == (mode_t)VNOVAL &&
1056 vap->va_uid == (uid_t)VNOVAL &&
1057 vap->va_gid == (gid_t)VNOVAL)
1058 return (0);
1059 vap->va_size = VNOVAL;
1060 break;
1061 default:
1062 /*
1063 * Disallow write attempts if the filesystem is
1064 * mounted read-only.
1065 */
1066 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1067 return (EROFS);
1068 /*
1069 * We run vnode_pager_setsize() early (why?),
1070 * we must set np->n_size now to avoid vinvalbuf
1071 * V_SAVE races that might setsize a lower
1072 * value.
1073 */
1074 NFSLOCKNODE(np);
1075 tsize = np->n_size;
1076 NFSUNLOCKNODE(np);
1077 error = ncl_meta_setsize(vp, td, vap->va_size);
1078 NFSLOCKNODE(np);
1079 if (np->n_flag & NMODIFIED) {
1080 tsize = np->n_size;
1081 NFSUNLOCKNODE(np);
1082 error = ncl_vinvalbuf(vp, vap->va_size == 0 ?
1083 0 : V_SAVE, td, 1);
1084 if (error != 0) {
1085 vnode_pager_setsize(vp, tsize);
1086 return (error);
1087 }
1088 /*
1089 * Call nfscl_delegmodtime() to set the modify time
1090 * locally, as required.
1091 */
1092 nfscl_delegmodtime(vp);
1093 } else
1094 NFSUNLOCKNODE(np);
1095 /*
1096 * np->n_size has already been set to vap->va_size
1097 * in ncl_meta_setsize(). We must set it again since
1098 * nfs_loadattrcache() could be called through
1099 * ncl_meta_setsize() and could modify np->n_size.
1100 */
1101 NFSLOCKNODE(np);
1102 np->n_vattr.na_size = np->n_size = vap->va_size;
1103 NFSUNLOCKNODE(np);
1104 }
1105 } else {
1106 NFSLOCKNODE(np);
1107 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) &&
1108 (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
1109 NFSUNLOCKNODE(np);
1110 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
1111 if (error == EINTR || error == EIO)
1112 return (error);
1113 } else
1114 NFSUNLOCKNODE(np);
1115 }
1116 error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
1117 if (error && vap->va_size != VNOVAL) {
1118 NFSLOCKNODE(np);
1119 np->n_size = np->n_vattr.na_size = tsize;
1120 vnode_pager_setsize(vp, tsize);
1121 NFSUNLOCKNODE(np);
1122 }
1123 return (error);
1124 }
1125
1126 /*
1127 * Do an nfs setattr rpc.
1128 */
1129 static int
1130 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
1131 struct thread *td)
1132 {
1133 struct nfsnode *np = VTONFS(vp);
1134 int error, ret, attrflag, i;
1135 struct nfsvattr nfsva;
1136
1137 if (NFS_ISV34(vp)) {
1138 NFSLOCKNODE(np);
1139 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
1140 np->n_accesscache[i].stamp = 0;
1141 np->n_flag |= NDELEGMOD;
1142 NFSUNLOCKNODE(np);
1143 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
1144 }
1145 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
1146 NULL);
1147 if (attrflag) {
1148 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1149 if (ret && !error)
1150 error = ret;
1151 }
1152 if (error && NFS_ISV4(vp))
1153 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
1154 return (error);
1155 }
1156
1157 /*
1158 * nfs lookup call, one step at a time...
1159 * First look in cache
1160 * If not found, unlock the directory nfsnode and do the rpc
1161 */
1162 static int
1163 nfs_lookup(struct vop_lookup_args *ap)
1164 {
1165 struct componentname *cnp = ap->a_cnp;
1166 struct vnode *dvp = ap->a_dvp;
1167 struct vnode **vpp = ap->a_vpp;
1168 struct mount *mp = dvp->v_mount;
1169 int flags = cnp->cn_flags;
1170 struct vnode *newvp;
1171 struct nfsmount *nmp;
1172 struct nfsnode *np, *newnp;
1173 int error = 0, attrflag, dattrflag, ltype, ncticks;
1174 struct thread *td = cnp->cn_thread;
1175 struct nfsfh *nfhp;
1176 struct nfsvattr dnfsva, nfsva;
1177 struct vattr vattr;
1178 struct timespec nctime;
1179
1180 *vpp = NULLVP;
1181 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
1182 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
1183 return (EROFS);
1184 if (dvp->v_type != VDIR)
1185 return (ENOTDIR);
1186 nmp = VFSTONFS(mp);
1187 np = VTONFS(dvp);
1188
1189 /* For NFSv4, wait until any remove is done. */
1190 NFSLOCKNODE(np);
1191 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
1192 np->n_flag |= NREMOVEWANT;
1193 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
1194 }
1195 NFSUNLOCKNODE(np);
1196
1197 error = vn_dir_check_exec(dvp, cnp);
1198 if (error != 0)
1199 return (error);
1200 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks);
1201 if (error > 0 && error != ENOENT)
1202 return (error);
1203 if (error == -1) {
1204 /*
1205 * Lookups of "." are special and always return the
1206 * current directory. cache_lookup() already handles
1207 * associated locking bookkeeping, etc.
1208 */
1209 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
1210 /* XXX: Is this really correct? */
1211 if (cnp->cn_nameiop != LOOKUP &&
1212 (flags & ISLASTCN))
1213 cnp->cn_flags |= SAVENAME;
1214 return (0);
1215 }
1216
1217 /*
1218 * We only accept a positive hit in the cache if the
1219 * change time of the file matches our cached copy.
1220 * Otherwise, we discard the cache entry and fallback
1221 * to doing a lookup RPC. We also only trust cache
1222 * entries for less than nm_nametimeo seconds.
1223 *
1224 * To better handle stale file handles and attributes,
1225 * clear the attribute cache of this node if it is a
1226 * leaf component, part of an open() call, and not
1227 * locally modified before fetching the attributes.
1228 * This should allow stale file handles to be detected
1229 * here where we can fall back to a LOOKUP RPC to
1230 * recover rather than having nfs_open() detect the
1231 * stale file handle and failing open(2) with ESTALE.
1232 */
1233 newvp = *vpp;
1234 newnp = VTONFS(newvp);
1235 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
1236 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1237 !(newnp->n_flag & NMODIFIED)) {
1238 NFSLOCKNODE(newnp);
1239 newnp->n_attrstamp = 0;
1240 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1241 NFSUNLOCKNODE(newnp);
1242 }
1243 if (nfscl_nodeleg(newvp, 0) == 0 ||
1244 ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
1245 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
1246 timespeccmp(&vattr.va_ctime, &nctime, ==))) {
1247 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits);
1248 if (cnp->cn_nameiop != LOOKUP &&
1249 (flags & ISLASTCN))
1250 cnp->cn_flags |= SAVENAME;
1251 return (0);
1252 }
1253 cache_purge(newvp);
1254 if (dvp != newvp)
1255 vput(newvp);
1256 else
1257 vrele(newvp);
1258 *vpp = NULLVP;
1259 } else if (error == ENOENT) {
1260 if (VN_IS_DOOMED(dvp))
1261 return (ENOENT);
1262 /*
1263 * We only accept a negative hit in the cache if the
1264 * modification time of the parent directory matches
1265 * the cached copy in the name cache entry.
1266 * Otherwise, we discard all of the negative cache
1267 * entries for this directory. We also only trust
1268 * negative cache entries for up to nm_negnametimeo
1269 * seconds.
1270 */
1271 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
1272 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
1273 timespeccmp(&vattr.va_mtime, &nctime, ==)) {
1274 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits);
1275 return (ENOENT);
1276 }
1277 cache_purge_negative(dvp);
1278 }
1279
1280 newvp = NULLVP;
1281 NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses);
1282 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1283 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1284 NULL);
1285 if (dattrflag)
1286 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1287 if (error) {
1288 if (newvp != NULLVP) {
1289 vput(newvp);
1290 *vpp = NULLVP;
1291 }
1292
1293 if (error != ENOENT) {
1294 if (NFS_ISV4(dvp))
1295 error = nfscl_maperr(td, error, (uid_t)0,
1296 (gid_t)0);
1297 return (error);
1298 }
1299
1300 /* The requested file was not found. */
1301 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
1302 (flags & ISLASTCN)) {
1303 /*
1304 * XXX: UFS does a full VOP_ACCESS(dvp,
1305 * VWRITE) here instead of just checking
1306 * MNT_RDONLY.
1307 */
1308 if (mp->mnt_flag & MNT_RDONLY)
1309 return (EROFS);
1310 cnp->cn_flags |= SAVENAME;
1311 return (EJUSTRETURN);
1312 }
1313
1314 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) {
1315 /*
1316 * Cache the modification time of the parent
1317 * directory from the post-op attributes in
1318 * the name cache entry. The negative cache
1319 * entry will be ignored once the directory
1320 * has changed. Don't bother adding the entry
1321 * if the directory has already changed.
1322 */
1323 NFSLOCKNODE(np);
1324 if (timespeccmp(&np->n_vattr.na_mtime,
1325 &dnfsva.na_mtime, ==)) {
1326 NFSUNLOCKNODE(np);
1327 cache_enter_time(dvp, NULL, cnp,
1328 &dnfsva.na_mtime, NULL);
1329 } else
1330 NFSUNLOCKNODE(np);
1331 }
1332 return (ENOENT);
1333 }
1334
1335 /*
1336 * Handle RENAME case...
1337 */
1338 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
1339 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1340 free(nfhp, M_NFSFH);
1341 return (EISDIR);
1342 }
1343 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1344 LK_EXCLUSIVE);
1345 if (error)
1346 return (error);
1347 newvp = NFSTOV(np);
1348 if (attrflag)
1349 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1350 0, 1);
1351 *vpp = newvp;
1352 cnp->cn_flags |= SAVENAME;
1353 return (0);
1354 }
1355
1356 if (flags & ISDOTDOT) {
1357 ltype = NFSVOPISLOCKED(dvp);
1358 error = vfs_busy(mp, MBF_NOWAIT);
1359 if (error != 0) {
1360 vfs_ref(mp);
1361 NFSVOPUNLOCK(dvp);
1362 error = vfs_busy(mp, 0);
1363 NFSVOPLOCK(dvp, ltype | LK_RETRY);
1364 vfs_rel(mp);
1365 if (error == 0 && VN_IS_DOOMED(dvp)) {
1366 vfs_unbusy(mp);
1367 error = ENOENT;
1368 }
1369 if (error != 0)
1370 return (error);
1371 }
1372 NFSVOPUNLOCK(dvp);
1373 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1374 cnp->cn_lkflags);
1375 if (error == 0)
1376 newvp = NFSTOV(np);
1377 vfs_unbusy(mp);
1378 if (newvp != dvp)
1379 NFSVOPLOCK(dvp, ltype | LK_RETRY);
1380 if (VN_IS_DOOMED(dvp)) {
1381 if (error == 0) {
1382 if (newvp == dvp)
1383 vrele(newvp);
1384 else
1385 vput(newvp);
1386 }
1387 error = ENOENT;
1388 }
1389 if (error != 0)
1390 return (error);
1391 if (attrflag)
1392 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1393 0, 1);
1394 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1395 free(nfhp, M_NFSFH);
1396 VREF(dvp);
1397 newvp = dvp;
1398 if (attrflag)
1399 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1400 0, 1);
1401 } else {
1402 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1403 cnp->cn_lkflags);
1404 if (error)
1405 return (error);
1406 newvp = NFSTOV(np);
1407 if (attrflag)
1408 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1409 0, 1);
1410 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1411 !(np->n_flag & NMODIFIED)) {
1412 /*
1413 * Flush the attribute cache when opening a
1414 * leaf node to ensure that fresh attributes
1415 * are fetched in nfs_open() since we did not
1416 * fetch attributes from the LOOKUP reply.
1417 */
1418 NFSLOCKNODE(np);
1419 np->n_attrstamp = 0;
1420 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1421 NFSUNLOCKNODE(np);
1422 }
1423 }
1424 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
1425 cnp->cn_flags |= SAVENAME;
1426 if ((cnp->cn_flags & MAKEENTRY) &&
1427 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
1428 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
1429 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
1430 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime);
1431 *vpp = newvp;
1432 return (0);
1433 }
1434
1435 /*
1436 * nfs read call.
1437 * Just call ncl_bioread() to do the work.
1438 */
1439 static int
1440 nfs_read(struct vop_read_args *ap)
1441 {
1442 struct vnode *vp = ap->a_vp;
1443
1444 switch (vp->v_type) {
1445 case VREG:
1446 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
1447 case VDIR:
1448 return (EISDIR);
1449 default:
1450 return (EOPNOTSUPP);
1451 }
1452 }
1453
1454 /*
1455 * nfs readlink call
1456 */
1457 static int
1458 nfs_readlink(struct vop_readlink_args *ap)
1459 {
1460 struct vnode *vp = ap->a_vp;
1461
1462 if (vp->v_type != VLNK)
1463 return (EINVAL);
1464 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
1465 }
1466
1467 /*
1468 * Do a readlink rpc.
1469 * Called by ncl_doio() from below the buffer cache.
1470 */
1471 int
1472 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1473 {
1474 int error, ret, attrflag;
1475 struct nfsvattr nfsva;
1476
1477 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
1478 &attrflag, NULL);
1479 if (attrflag) {
1480 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1481 if (ret && !error)
1482 error = ret;
1483 }
1484 if (error && NFS_ISV4(vp))
1485 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1486 return (error);
1487 }
1488
1489 /*
1490 * nfs read rpc call
1491 * Ditto above
1492 */
1493 int
1494 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1495 {
1496 int error, ret, attrflag;
1497 struct nfsvattr nfsva;
1498 struct nfsmount *nmp;
1499
1500 nmp = VFSTONFS(vp->v_mount);
1501 error = EIO;
1502 attrflag = 0;
1503 if (NFSHASPNFS(nmp))
1504 error = nfscl_doiods(vp, uiop, NULL, NULL,
1505 NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td);
1506 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error);
1507 if (error != 0)
1508 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva,
1509 &attrflag, NULL);
1510 if (attrflag) {
1511 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1512 if (ret && !error)
1513 error = ret;
1514 }
1515 if (error && NFS_ISV4(vp))
1516 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1517 return (error);
1518 }
1519
1520 /*
1521 * nfs write call
1522 */
1523 int
1524 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
1525 int *iomode, int *must_commit, int called_from_strategy)
1526 {
1527 struct nfsvattr nfsva;
1528 int error, attrflag, ret;
1529 struct nfsmount *nmp;
1530
1531 nmp = VFSTONFS(vp->v_mount);
1532 error = EIO;
1533 attrflag = 0;
1534 if (NFSHASPNFS(nmp))
1535 error = nfscl_doiods(vp, uiop, iomode, must_commit,
1536 NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td);
1537 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error);
1538 if (error != 0)
1539 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
1540 uiop->uio_td, &nfsva, &attrflag, NULL,
1541 called_from_strategy);
1542 if (attrflag) {
1543 if (VTONFS(vp)->n_flag & ND_NFSV4)
1544 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1,
1545 1);
1546 else
1547 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
1548 1);
1549 if (ret && !error)
1550 error = ret;
1551 }
1552 if (DOINGASYNC(vp))
1553 *iomode = NFSWRITE_FILESYNC;
1554 if (error && NFS_ISV4(vp))
1555 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1556 return (error);
1557 }
1558
1559 /*
1560 * nfs mknod rpc
1561 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
1562 * mode set to specify the file type and the size field for rdev.
1563 */
1564 static int
1565 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
1566 struct vattr *vap)
1567 {
1568 struct nfsvattr nfsva, dnfsva;
1569 struct vnode *newvp = NULL;
1570 struct nfsnode *np = NULL, *dnp;
1571 struct nfsfh *nfhp;
1572 struct vattr vattr;
1573 int error = 0, attrflag, dattrflag;
1574 u_int32_t rdev;
1575
1576 if (vap->va_type == VCHR || vap->va_type == VBLK)
1577 rdev = vap->va_rdev;
1578 else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
1579 rdev = 0xffffffff;
1580 else
1581 return (EOPNOTSUPP);
1582 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1583 return (error);
1584 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
1585 rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva,
1586 &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
1587 if (!error) {
1588 if (!nfhp)
1589 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1590 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
1591 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1592 NULL);
1593 if (nfhp)
1594 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1595 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
1596 }
1597 if (dattrflag)
1598 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1599 if (!error) {
1600 newvp = NFSTOV(np);
1601 if (attrflag != 0) {
1602 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1603 0, 1);
1604 if (error != 0)
1605 vput(newvp);
1606 }
1607 }
1608 if (!error) {
1609 *vpp = newvp;
1610 } else if (NFS_ISV4(dvp)) {
1611 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
1612 vap->va_gid);
1613 }
1614 dnp = VTONFS(dvp);
1615 NFSLOCKNODE(dnp);
1616 dnp->n_flag |= NMODIFIED;
1617 if (!dattrflag) {
1618 dnp->n_attrstamp = 0;
1619 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1620 }
1621 NFSUNLOCKNODE(dnp);
1622 return (error);
1623 }
1624
1625 /*
1626 * nfs mknod vop
1627 * just call nfs_mknodrpc() to do the work.
1628 */
1629 /* ARGSUSED */
1630 static int
1631 nfs_mknod(struct vop_mknod_args *ap)
1632 {
1633 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
1634 }
1635
1636 static struct mtx nfs_cverf_mtx;
1637 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex",
1638 MTX_DEF);
1639
1640 static nfsquad_t
1641 nfs_get_cverf(void)
1642 {
1643 static nfsquad_t cverf;
1644 nfsquad_t ret;
1645 static int cverf_initialized = 0;
1646
1647 mtx_lock(&nfs_cverf_mtx);
1648 if (cverf_initialized == 0) {
1649 cverf.lval[0] = arc4random();
1650 cverf.lval[1] = arc4random();
1651 cverf_initialized = 1;
1652 } else
1653 cverf.qval++;
1654 ret = cverf;
1655 mtx_unlock(&nfs_cverf_mtx);
1656
1657 return (ret);
1658 }
1659
1660 /*
1661 * nfs file create call
1662 */
1663 static int
1664 nfs_create(struct vop_create_args *ap)
1665 {
1666 struct vnode *dvp = ap->a_dvp;
1667 struct vattr *vap = ap->a_vap;
1668 struct componentname *cnp = ap->a_cnp;
1669 struct nfsnode *np = NULL, *dnp;
1670 struct vnode *newvp = NULL;
1671 struct nfsmount *nmp;
1672 struct nfsvattr dnfsva, nfsva;
1673 struct nfsfh *nfhp;
1674 nfsquad_t cverf;
1675 int error = 0, attrflag, dattrflag, fmode = 0;
1676 struct vattr vattr;
1677
1678 /*
1679 * Oops, not for me..
1680 */
1681 if (vap->va_type == VSOCK)
1682 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
1683
1684 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1685 return (error);
1686 if (vap->va_vaflags & VA_EXCLUSIVE)
1687 fmode |= O_EXCL;
1688 dnp = VTONFS(dvp);
1689 nmp = VFSTONFS(dvp->v_mount);
1690 again:
1691 /* For NFSv4, wait until any remove is done. */
1692 NFSLOCKNODE(dnp);
1693 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
1694 dnp->n_flag |= NREMOVEWANT;
1695 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
1696 }
1697 NFSUNLOCKNODE(dnp);
1698
1699 cverf = nfs_get_cverf();
1700 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1701 vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva,
1702 &nfhp, &attrflag, &dattrflag, NULL);
1703 if (!error) {
1704 if (nfhp == NULL)
1705 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1706 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
1707 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1708 NULL);
1709 if (nfhp != NULL)
1710 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1711 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
1712 }
1713 if (dattrflag)
1714 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1715 if (!error) {
1716 newvp = NFSTOV(np);
1717 if (attrflag == 0)
1718 error = nfsrpc_getattr(newvp, cnp->cn_cred,
1719 cnp->cn_thread, &nfsva, NULL);
1720 if (error == 0)
1721 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1722 0, 1);
1723 }
1724 if (error) {
1725 if (newvp != NULL) {
1726 vput(newvp);
1727 newvp = NULL;
1728 }
1729 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
1730 error == NFSERR_NOTSUPP) {
1731 fmode &= ~O_EXCL;
1732 goto again;
1733 }
1734 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
1735 if (nfscl_checksattr(vap, &nfsva)) {
1736 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
1737 cnp->cn_thread, &nfsva, &attrflag, NULL);
1738 if (error && (vap->va_uid != (uid_t)VNOVAL ||
1739 vap->va_gid != (gid_t)VNOVAL)) {
1740 /* try again without setting uid/gid */
1741 vap->va_uid = (uid_t)VNOVAL;
1742 vap->va_gid = (uid_t)VNOVAL;
1743 error = nfsrpc_setattr(newvp, vap, NULL,
1744 cnp->cn_cred, cnp->cn_thread, &nfsva,
1745 &attrflag, NULL);
1746 }
1747 if (attrflag)
1748 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
1749 NULL, 0, 1);
1750 if (error != 0)
1751 vput(newvp);
1752 }
1753 }
1754 if (!error) {
1755 if ((cnp->cn_flags & MAKEENTRY) && attrflag)
1756 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
1757 NULL);
1758 *ap->a_vpp = newvp;
1759 } else if (NFS_ISV4(dvp)) {
1760 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
1761 vap->va_gid);
1762 }
1763 NFSLOCKNODE(dnp);
1764 dnp->n_flag |= NMODIFIED;
1765 if (!dattrflag) {
1766 dnp->n_attrstamp = 0;
1767 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1768 }
1769 NFSUNLOCKNODE(dnp);
1770 return (error);
1771 }
1772
1773 /*
1774 * nfs file remove call
1775 * To try and make nfs semantics closer to ufs semantics, a file that has
1776 * other processes using the vnode is renamed instead of removed and then
1777 * removed later on the last close.
1778 * - If v_usecount > 1
1779 * If a rename is not already in the works
1780 * call nfs_sillyrename() to set it up
1781 * else
1782 * do the remove rpc
1783 */
1784 static int
1785 nfs_remove(struct vop_remove_args *ap)
1786 {
1787 struct vnode *vp = ap->a_vp;
1788 struct vnode *dvp = ap->a_dvp;
1789 struct componentname *cnp = ap->a_cnp;
1790 struct nfsnode *np = VTONFS(vp);
1791 int error = 0;
1792 struct vattr vattr;
1793
1794 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
1795 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
1796 if (vp->v_type == VDIR)
1797 error = EPERM;
1798 else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
1799 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
1800 vattr.va_nlink > 1)) {
1801 /*
1802 * Purge the name cache so that the chance of a lookup for
1803 * the name succeeding while the remove is in progress is
1804 * minimized. Without node locking it can still happen, such
1805 * that an I/O op returns ESTALE, but since you get this if
1806 * another host removes the file..
1807 */
1808 cache_purge(vp);
1809 /*
1810 * throw away biocache buffers, mainly to avoid
1811 * unnecessary delayed writes later.
1812 */
1813 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1);
1814 if (error != EINTR && error != EIO)
1815 /* Do the rpc */
1816 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
1817 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
1818 /*
1819 * Kludge City: If the first reply to the remove rpc is lost..
1820 * the reply to the retransmitted request will be ENOENT
1821 * since the file was in fact removed
1822 * Therefore, we cheat and return success.
1823 */
1824 if (error == ENOENT)
1825 error = 0;
1826 } else if (!np->n_sillyrename)
1827 error = nfs_sillyrename(dvp, vp, cnp);
1828 NFSLOCKNODE(np);
1829 np->n_attrstamp = 0;
1830 NFSUNLOCKNODE(np);
1831 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1832 return (error);
1833 }
1834
1835 /*
1836 * nfs file remove rpc called from nfs_inactive
1837 */
1838 int
1839 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
1840 {
1841 /*
1842 * Make sure that the directory vnode is still valid.
1843 * XXX we should lock sp->s_dvp here.
1844 */
1845 if (sp->s_dvp->v_type == VBAD)
1846 return (0);
1847 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
1848 sp->s_cred, NULL));
1849 }
1850
1851 /*
1852 * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
1853 */
1854 static int
1855 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
1856 int namelen, struct ucred *cred, struct thread *td)
1857 {
1858 struct nfsvattr dnfsva;
1859 struct nfsnode *dnp = VTONFS(dvp);
1860 int error = 0, dattrflag;
1861
1862 NFSLOCKNODE(dnp);
1863 dnp->n_flag |= NREMOVEINPROG;
1864 NFSUNLOCKNODE(dnp);
1865 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
1866 &dattrflag, NULL);
1867 NFSLOCKNODE(dnp);
1868 if ((dnp->n_flag & NREMOVEWANT)) {
1869 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
1870 NFSUNLOCKNODE(dnp);
1871 wakeup((caddr_t)dnp);
1872 } else {
1873 dnp->n_flag &= ~NREMOVEINPROG;
1874 NFSUNLOCKNODE(dnp);
1875 }
1876 if (dattrflag)
1877 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1878 NFSLOCKNODE(dnp);
1879 dnp->n_flag |= NMODIFIED;
1880 if (!dattrflag) {
1881 dnp->n_attrstamp = 0;
1882 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1883 }
1884 NFSUNLOCKNODE(dnp);
1885 if (error && NFS_ISV4(dvp))
1886 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1887 return (error);
1888 }
1889
1890 /*
1891 * nfs file rename call
1892 */
1893 static int
1894 nfs_rename(struct vop_rename_args *ap)
1895 {
1896 struct vnode *fvp = ap->a_fvp;
1897 struct vnode *tvp = ap->a_tvp;
1898 struct vnode *fdvp = ap->a_fdvp;
1899 struct vnode *tdvp = ap->a_tdvp;
1900 struct componentname *tcnp = ap->a_tcnp;
1901 struct componentname *fcnp = ap->a_fcnp;
1902 struct nfsnode *fnp = VTONFS(ap->a_fvp);
1903 struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
1904 struct nfsv4node *newv4 = NULL;
1905 int error;
1906
1907 KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
1908 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
1909 /* Check for cross-device rename */
1910 if ((fvp->v_mount != tdvp->v_mount) ||
1911 (tvp && (fvp->v_mount != tvp->v_mount))) {
1912 error = EXDEV;
1913 goto out;
1914 }
1915
1916 if (fvp == tvp) {
1917 printf("nfs_rename: fvp == tvp (can't happen)\n");
1918 error = 0;
1919 goto out;
1920 }
1921 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
1922 goto out;
1923
1924 /*
1925 * We have to flush B_DELWRI data prior to renaming
1926 * the file. If we don't, the delayed-write buffers
1927 * can be flushed out later after the file has gone stale
1928 * under NFSV3. NFSV2 does not have this problem because
1929 * ( as far as I can tell ) it flushes dirty buffers more
1930 * often.
1931 *
1932 * Skip the rename operation if the fsync fails, this can happen
1933 * due to the server's volume being full, when we pushed out data
1934 * that was written back to our cache earlier. Not checking for
1935 * this condition can result in potential (silent) data loss.
1936 */
1937 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
1938 NFSVOPUNLOCK(fvp);
1939 if (!error && tvp)
1940 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
1941 if (error)
1942 goto out;
1943
1944 /*
1945 * If the tvp exists and is in use, sillyrename it before doing the
1946 * rename of the new file over it.
1947 * XXX Can't sillyrename a directory.
1948 */
1949 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
1950 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
1951 vput(tvp);
1952 tvp = NULL;
1953 }
1954
1955 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
1956 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
1957 tcnp->cn_thread);
1958
1959 if (error == 0 && NFS_ISV4(tdvp)) {
1960 /*
1961 * For NFSv4, check to see if it is the same name and
1962 * replace the name, if it is different.
1963 */
1964 newv4 = malloc(
1965 sizeof (struct nfsv4node) +
1966 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
1967 M_NFSV4NODE, M_WAITOK);
1968 NFSLOCKNODE(tdnp);
1969 NFSLOCKNODE(fnp);
1970 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
1971 (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
1972 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
1973 tcnp->cn_namelen) ||
1974 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
1975 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
1976 tdnp->n_fhp->nfh_len))) {
1977 #ifdef notdef
1978 { char nnn[100]; int nnnl;
1979 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
1980 bcopy(tcnp->cn_nameptr, nnn, nnnl);
1981 nnn[nnnl] = '\0';
1982 printf("ren replace=%s\n",nnn);
1983 }
1984 #endif
1985 free(fnp->n_v4, M_NFSV4NODE);
1986 fnp->n_v4 = newv4;
1987 newv4 = NULL;
1988 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
1989 fnp->n_v4->n4_namelen = tcnp->cn_namelen;
1990 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
1991 tdnp->n_fhp->nfh_len);
1992 NFSBCOPY(tcnp->cn_nameptr,
1993 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
1994 }
1995 NFSUNLOCKNODE(tdnp);
1996 NFSUNLOCKNODE(fnp);
1997 if (newv4 != NULL)
1998 free(newv4, M_NFSV4NODE);
1999 }
2000
2001 if (fvp->v_type == VDIR) {
2002 if (tvp != NULL && tvp->v_type == VDIR)
2003 cache_purge(tdvp);
2004 cache_purge(fdvp);
2005 }
2006
2007 out:
2008 if (tdvp == tvp)
2009 vrele(tdvp);
2010 else
2011 vput(tdvp);
2012 if (tvp)
2013 vput(tvp);
2014 vrele(fdvp);
2015 vrele(fvp);
2016 /*
2017 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
2018 */
2019 if (error == ENOENT)
2020 error = 0;
2021 return (error);
2022 }
2023
2024 /*
2025 * nfs file rename rpc called from nfs_remove() above
2026 */
2027 static int
2028 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
2029 struct sillyrename *sp)
2030 {
2031
2032 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
2033 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
2034 scnp->cn_thread));
2035 }
2036
2037 /*
2038 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
2039 */
2040 static int
2041 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
2042 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
2043 int tnamelen, struct ucred *cred, struct thread *td)
2044 {
2045 struct nfsvattr fnfsva, tnfsva;
2046 struct nfsnode *fdnp = VTONFS(fdvp);
2047 struct nfsnode *tdnp = VTONFS(tdvp);
2048 int error = 0, fattrflag, tattrflag;
2049
2050 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
2051 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
2052 &tattrflag, NULL, NULL);
2053 NFSLOCKNODE(fdnp);
2054 fdnp->n_flag |= NMODIFIED;
2055 if (fattrflag != 0) {
2056 NFSUNLOCKNODE(fdnp);
2057 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1);
2058 } else {
2059 fdnp->n_attrstamp = 0;
2060 NFSUNLOCKNODE(fdnp);
2061 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
2062 }
2063 NFSLOCKNODE(tdnp);
2064 tdnp->n_flag |= NMODIFIED;
2065 if (tattrflag != 0) {
2066 NFSUNLOCKNODE(tdnp);
2067 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1);
2068 } else {
2069 tdnp->n_attrstamp = 0;
2070 NFSUNLOCKNODE(tdnp);
2071 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
2072 }
2073 if (error && NFS_ISV4(fdvp))
2074 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2075 return (error);
2076 }
2077
2078 /*
2079 * nfs hard link create call
2080 */
2081 static int
2082 nfs_link(struct vop_link_args *ap)
2083 {
2084 struct vnode *vp = ap->a_vp;
2085 struct vnode *tdvp = ap->a_tdvp;
2086 struct componentname *cnp = ap->a_cnp;
2087 struct nfsnode *np, *tdnp;
2088 struct nfsvattr nfsva, dnfsva;
2089 int error = 0, attrflag, dattrflag;
2090
2091 /*
2092 * Push all writes to the server, so that the attribute cache
2093 * doesn't get "out of sync" with the server.
2094 * XXX There should be a better way!
2095 */
2096 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
2097
2098 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
2099 cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag,
2100 &dattrflag, NULL);
2101 tdnp = VTONFS(tdvp);
2102 NFSLOCKNODE(tdnp);
2103 tdnp->n_flag |= NMODIFIED;
2104 if (dattrflag != 0) {
2105 NFSUNLOCKNODE(tdnp);
2106 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1);
2107 } else {
2108 tdnp->n_attrstamp = 0;
2109 NFSUNLOCKNODE(tdnp);
2110 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
2111 }
2112 if (attrflag)
2113 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2114 else {
2115 np = VTONFS(vp);
2116 NFSLOCKNODE(np);
2117 np->n_attrstamp = 0;
2118 NFSUNLOCKNODE(np);
2119 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
2120 }
2121 /*
2122 * If negative lookup caching is enabled, I might as well
2123 * add an entry for this node. Not necessary for correctness,
2124 * but if negative caching is enabled, then the system
2125 * must care about lookup caching hit rate, so...
2126 */
2127 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
2128 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2129 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL);
2130 }
2131 if (error && NFS_ISV4(vp))
2132 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
2133 (gid_t)0);
2134 return (error);
2135 }
2136
2137 /*
2138 * nfs symbolic link create call
2139 */
2140 static int
2141 nfs_symlink(struct vop_symlink_args *ap)
2142 {
2143 struct vnode *dvp = ap->a_dvp;
2144 struct vattr *vap = ap->a_vap;
2145 struct componentname *cnp = ap->a_cnp;
2146 struct nfsvattr nfsva, dnfsva;
2147 struct nfsfh *nfhp;
2148 struct nfsnode *np = NULL, *dnp;
2149 struct vnode *newvp = NULL;
2150 int error = 0, attrflag, dattrflag, ret;
2151
2152 vap->va_type = VLNK;
2153 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2154 ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva,
2155 &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
2156 if (nfhp) {
2157 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
2158 &np, NULL, LK_EXCLUSIVE);
2159 if (!ret)
2160 newvp = NFSTOV(np);
2161 else if (!error)
2162 error = ret;
2163 }
2164 if (newvp != NULL) {
2165 if (attrflag)
2166 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
2167 0, 1);
2168 } else if (!error) {
2169 /*
2170 * If we do not have an error and we could not extract the
2171 * newvp from the response due to the request being NFSv2, we
2172 * have to do a lookup in order to obtain a newvp to return.
2173 */
2174 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2175 cnp->cn_cred, cnp->cn_thread, &np);
2176 if (!error)
2177 newvp = NFSTOV(np);
2178 }
2179 if (error) {
2180 if (newvp)
2181 vput(newvp);
2182 if (NFS_ISV4(dvp))
2183 error = nfscl_maperr(cnp->cn_thread, error,
2184 vap->va_uid, vap->va_gid);
2185 } else {
2186 *ap->a_vpp = newvp;
2187 }
2188
2189 dnp = VTONFS(dvp);
2190 NFSLOCKNODE(dnp);
2191 dnp->n_flag |= NMODIFIED;
2192 if (dattrflag != 0) {
2193 NFSUNLOCKNODE(dnp);
2194 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2195 } else {
2196 dnp->n_attrstamp = 0;
2197 NFSUNLOCKNODE(dnp);
2198 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2199 }
2200 /*
2201 * If negative lookup caching is enabled, I might as well
2202 * add an entry for this node. Not necessary for correctness,
2203 * but if negative caching is enabled, then the system
2204 * must care about lookup caching hit rate, so...
2205 */
2206 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2207 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2208 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, NULL);
2209 }
2210 return (error);
2211 }
2212
2213 /*
2214 * nfs make dir call
2215 */
2216 static int
2217 nfs_mkdir(struct vop_mkdir_args *ap)
2218 {
2219 struct vnode *dvp = ap->a_dvp;
2220 struct vattr *vap = ap->a_vap;
2221 struct componentname *cnp = ap->a_cnp;
2222 struct nfsnode *np = NULL, *dnp;
2223 struct vnode *newvp = NULL;
2224 struct vattr vattr;
2225 struct nfsfh *nfhp;
2226 struct nfsvattr nfsva, dnfsva;
2227 int error = 0, attrflag, dattrflag, ret;
2228
2229 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
2230 return (error);
2231 vap->va_type = VDIR;
2232 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2233 vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp,
2234 &attrflag, &dattrflag, NULL);
2235 dnp = VTONFS(dvp);
2236 NFSLOCKNODE(dnp);
2237 dnp->n_flag |= NMODIFIED;
2238 if (dattrflag != 0) {
2239 NFSUNLOCKNODE(dnp);
2240 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2241 } else {
2242 dnp->n_attrstamp = 0;
2243 NFSUNLOCKNODE(dnp);
2244 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2245 }
2246 if (nfhp) {
2247 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
2248 &np, NULL, LK_EXCLUSIVE);
2249 if (!ret) {
2250 newvp = NFSTOV(np);
2251 if (attrflag)
2252 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
2253 NULL, 0, 1);
2254 } else if (!error)
2255 error = ret;
2256 }
2257 if (!error && newvp == NULL) {
2258 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2259 cnp->cn_cred, cnp->cn_thread, &np);
2260 if (!error) {
2261 newvp = NFSTOV(np);
2262 if (newvp->v_type != VDIR)
2263 error = EEXIST;
2264 }
2265 }
2266 if (error) {
2267 if (newvp)
2268 vput(newvp);
2269 if (NFS_ISV4(dvp))
2270 error = nfscl_maperr(cnp->cn_thread, error,
2271 vap->va_uid, vap->va_gid);
2272 } else {
2273 /*
2274 * If negative lookup caching is enabled, I might as well
2275 * add an entry for this node. Not necessary for correctness,
2276 * but if negative caching is enabled, then the system
2277 * must care about lookup caching hit rate, so...
2278 */
2279 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2280 (cnp->cn_flags & MAKEENTRY) &&
2281 attrflag != 0 && dattrflag != 0)
2282 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
2283 &dnfsva.na_ctime);
2284 *ap->a_vpp = newvp;
2285 }
2286 return (error);
2287 }
2288
2289 /*
2290 * nfs remove directory call
2291 */
2292 static int
2293 nfs_rmdir(struct vop_rmdir_args *ap)
2294 {
2295 struct vnode *vp = ap->a_vp;
2296 struct vnode *dvp = ap->a_dvp;
2297 struct componentname *cnp = ap->a_cnp;
2298 struct nfsnode *dnp;
2299 struct nfsvattr dnfsva;
2300 int error, dattrflag;
2301
2302 if (dvp == vp)
2303 return (EINVAL);
2304 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2305 cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL);
2306 dnp = VTONFS(dvp);
2307 NFSLOCKNODE(dnp);
2308 dnp->n_flag |= NMODIFIED;
2309 if (dattrflag != 0) {
2310 NFSUNLOCKNODE(dnp);
2311 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2312 } else {
2313 dnp->n_attrstamp = 0;
2314 NFSUNLOCKNODE(dnp);
2315 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2316 }
2317
2318 cache_purge(dvp);
2319 cache_purge(vp);
2320 if (error && NFS_ISV4(dvp))
2321 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
2322 (gid_t)0);
2323 /*
2324 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
2325 */
2326 if (error == ENOENT)
2327 error = 0;
2328 return (error);
2329 }
2330
2331 /*
2332 * nfs readdir call
2333 */
2334 static int
2335 nfs_readdir(struct vop_readdir_args *ap)
2336 {
2337 struct vnode *vp = ap->a_vp;
2338 struct nfsnode *np = VTONFS(vp);
2339 struct uio *uio = ap->a_uio;
2340 ssize_t tresid, left;
2341 int error = 0;
2342 struct vattr vattr;
2343
2344 if (ap->a_eofflag != NULL)
2345 *ap->a_eofflag = 0;
2346 if (vp->v_type != VDIR)
2347 return(EPERM);
2348
2349 /*
2350 * First, check for hit on the EOF offset cache
2351 */
2352 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
2353 (np->n_flag & NMODIFIED) == 0) {
2354 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
2355 NFSLOCKNODE(np);
2356 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
2357 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
2358 NFSUNLOCKNODE(np);
2359 NFSINCRGLOBAL(nfsstatsv1.direofcache_hits);
2360 if (ap->a_eofflag != NULL)
2361 *ap->a_eofflag = 1;
2362 return (0);
2363 } else
2364 NFSUNLOCKNODE(np);
2365 }
2366 }
2367
2368 /*
2369 * NFS always guarantees that directory entries don't straddle
2370 * DIRBLKSIZ boundaries. As such, we need to limit the size
2371 * to an exact multiple of DIRBLKSIZ, to avoid copying a partial
2372 * directory entry.
2373 */
2374 left = uio->uio_resid % DIRBLKSIZ;
2375 if (left == uio->uio_resid)
2376 return (EINVAL);
2377 uio->uio_resid -= left;
2378
2379 /*
2380 * Call ncl_bioread() to do the real work.
2381 */
2382 tresid = uio->uio_resid;
2383 error = ncl_bioread(vp, uio, 0, ap->a_cred);
2384
2385 if (!error && uio->uio_resid == tresid) {
2386 NFSINCRGLOBAL(nfsstatsv1.direofcache_misses);
2387 if (ap->a_eofflag != NULL)
2388 *ap->a_eofflag = 1;
2389 }
2390
2391 /* Add the partial DIRBLKSIZ (left) back in. */
2392 uio->uio_resid += left;
2393 return (error);
2394 }
2395
2396 /*
2397 * Readdir rpc call.
2398 * Called from below the buffer cache by ncl_doio().
2399 */
2400 int
2401 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2402 struct thread *td)
2403 {
2404 struct nfsvattr nfsva;
2405 nfsuint64 *cookiep, cookie;
2406 struct nfsnode *dnp = VTONFS(vp);
2407 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2408 int error = 0, eof, attrflag;
2409
2410 KASSERT(uiop->uio_iovcnt == 1 &&
2411 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2412 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2413 ("nfs readdirrpc bad uio"));
2414
2415 /*
2416 * If there is no cookie, assume directory was stale.
2417 */
2418 ncl_dircookie_lock(dnp);
2419 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2420 if (cookiep) {
2421 cookie = *cookiep;
2422 ncl_dircookie_unlock(dnp);
2423 } else {
2424 ncl_dircookie_unlock(dnp);
2425 return (NFSERR_BAD_COOKIE);
2426 }
2427
2428 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2429 (void)ncl_fsinfo(nmp, vp, cred, td);
2430
2431 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
2432 &attrflag, &eof, NULL);
2433 if (attrflag)
2434 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2435
2436 if (!error) {
2437 /*
2438 * We are now either at the end of the directory or have filled
2439 * the block.
2440 */
2441 if (eof)
2442 dnp->n_direofoffset = uiop->uio_offset;
2443 else {
2444 if (uiop->uio_resid > 0)
2445 printf("EEK! readdirrpc resid > 0\n");
2446 ncl_dircookie_lock(dnp);
2447 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2448 *cookiep = cookie;
2449 ncl_dircookie_unlock(dnp);
2450 }
2451 } else if (NFS_ISV4(vp)) {
2452 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2453 }
2454 return (error);
2455 }
2456
2457 /*
2458 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
2459 */
2460 int
2461 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2462 struct thread *td)
2463 {
2464 struct nfsvattr nfsva;
2465 nfsuint64 *cookiep, cookie;
2466 struct nfsnode *dnp = VTONFS(vp);
2467 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2468 int error = 0, attrflag, eof;
2469
2470 KASSERT(uiop->uio_iovcnt == 1 &&
2471 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2472 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2473 ("nfs readdirplusrpc bad uio"));
2474
2475 /*
2476 * If there is no cookie, assume directory was stale.
2477 */
2478 ncl_dircookie_lock(dnp);
2479 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2480 if (cookiep) {
2481 cookie = *cookiep;
2482 ncl_dircookie_unlock(dnp);
2483 } else {
2484 ncl_dircookie_unlock(dnp);
2485 return (NFSERR_BAD_COOKIE);
2486 }
2487
2488 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2489 (void)ncl_fsinfo(nmp, vp, cred, td);
2490 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
2491 &attrflag, &eof, NULL);
2492 if (attrflag)
2493 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2494
2495 if (!error) {
2496 /*
2497 * We are now either at end of the directory or have filled the
2498 * the block.
2499 */
2500 if (eof)
2501 dnp->n_direofoffset = uiop->uio_offset;
2502 else {
2503 if (uiop->uio_resid > 0)
2504 printf("EEK! readdirplusrpc resid > 0\n");
2505 ncl_dircookie_lock(dnp);
2506 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2507 *cookiep = cookie;
2508 ncl_dircookie_unlock(dnp);
2509 }
2510 } else if (NFS_ISV4(vp)) {
2511 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2512 }
2513 return (error);
2514 }
2515
2516 /*
2517 * Silly rename. To make the NFS filesystem that is stateless look a little
2518 * more like the "ufs" a remove of an active vnode is translated to a rename
2519 * to a funny looking filename that is removed by nfs_inactive on the
2520 * nfsnode. There is the potential for another process on a different client
2521 * to create the same funny name between the nfs_lookitup() fails and the
2522 * nfs_rename() completes, but...
2523 */
2524 static int
2525 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
2526 {
2527 struct sillyrename *sp;
2528 struct nfsnode *np;
2529 int error;
2530 short pid;
2531 unsigned int lticks;
2532
2533 cache_purge(dvp);
2534 np = VTONFS(vp);
2535 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
2536 sp = malloc(sizeof (struct sillyrename),
2537 M_NEWNFSREQ, M_WAITOK);
2538 sp->s_cred = crhold(cnp->cn_cred);
2539 sp->s_dvp = dvp;
2540 VREF(dvp);
2541
2542 /*
2543 * Fudge together a funny name.
2544 * Changing the format of the funny name to accommodate more
2545 * sillynames per directory.
2546 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is
2547 * CPU ticks since boot.
2548 */
2549 pid = cnp->cn_thread->td_proc->p_pid;
2550 lticks = (unsigned int)ticks;
2551 for ( ; ; ) {
2552 sp->s_namlen = sprintf(sp->s_name,
2553 ".nfs.%08x.%04x4.4", lticks,
2554 pid);
2555 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2556 cnp->cn_thread, NULL))
2557 break;
2558 lticks++;
2559 }
2560 error = nfs_renameit(dvp, vp, cnp, sp);
2561 if (error)
2562 goto bad;
2563 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2564 cnp->cn_thread, &np);
2565 np->n_sillyrename = sp;
2566 return (0);
2567 bad:
2568 vrele(sp->s_dvp);
2569 crfree(sp->s_cred);
2570 free(sp, M_NEWNFSREQ);
2571 return (error);
2572 }
2573
2574 /*
2575 * Look up a file name and optionally either update the file handle or
2576 * allocate an nfsnode, depending on the value of npp.
2577 * npp == NULL --> just do the lookup
2578 * *npp == NULL --> allocate a new nfsnode and make sure attributes are
2579 * handled too
2580 * *npp != NULL --> update the file handle in the vnode
2581 */
2582 static int
2583 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
2584 struct thread *td, struct nfsnode **npp)
2585 {
2586 struct vnode *newvp = NULL, *vp;
2587 struct nfsnode *np, *dnp = VTONFS(dvp);
2588 struct nfsfh *nfhp, *onfhp;
2589 struct nfsvattr nfsva, dnfsva;
2590 struct componentname cn;
2591 int error = 0, attrflag, dattrflag;
2592 u_int hash;
2593
2594 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
2595 &nfhp, &attrflag, &dattrflag, NULL);
2596 if (dattrflag)
2597 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2598 if (npp && !error) {
2599 if (*npp != NULL) {
2600 np = *npp;
2601 vp = NFSTOV(np);
2602 /*
2603 * For NFSv4, check to see if it is the same name and
2604 * replace the name, if it is different.
2605 */
2606 if (np->n_v4 != NULL && nfsva.na_type == VREG &&
2607 (np->n_v4->n4_namelen != len ||
2608 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
2609 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
2610 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2611 dnp->n_fhp->nfh_len))) {
2612 #ifdef notdef
2613 { char nnn[100]; int nnnl;
2614 nnnl = (len < 100) ? len : 99;
2615 bcopy(name, nnn, nnnl);
2616 nnn[nnnl] = '\0';
2617 printf("replace=%s\n",nnn);
2618 }
2619 #endif
2620 free(np->n_v4, M_NFSV4NODE);
2621 np->n_v4 = malloc(
2622 sizeof (struct nfsv4node) +
2623 dnp->n_fhp->nfh_len + len - 1,
2624 M_NFSV4NODE, M_WAITOK);
2625 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
2626 np->n_v4->n4_namelen = len;
2627 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2628 dnp->n_fhp->nfh_len);
2629 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
2630 }
2631 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
2632 FNV1_32_INIT);
2633 onfhp = np->n_fhp;
2634 /*
2635 * Rehash node for new file handle.
2636 */
2637 vfs_hash_rehash(vp, hash);
2638 np->n_fhp = nfhp;
2639 if (onfhp != NULL)
2640 free(onfhp, M_NFSFH);
2641 newvp = NFSTOV(np);
2642 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
2643 free(nfhp, M_NFSFH);
2644 VREF(dvp);
2645 newvp = dvp;
2646 } else {
2647 cn.cn_nameptr = name;
2648 cn.cn_namelen = len;
2649 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
2650 &np, NULL, LK_EXCLUSIVE);
2651 if (error)
2652 return (error);
2653 newvp = NFSTOV(np);
2654 }
2655 if (!attrflag && *npp == NULL) {
2656 if (newvp == dvp)
2657 vrele(newvp);
2658 else
2659 vput(newvp);
2660 return (ENOENT);
2661 }
2662 if (attrflag)
2663 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
2664 0, 1);
2665 }
2666 if (npp && *npp == NULL) {
2667 if (error) {
2668 if (newvp) {
2669 if (newvp == dvp)
2670 vrele(newvp);
2671 else
2672 vput(newvp);
2673 }
2674 } else
2675 *npp = np;
2676 }
2677 if (error && NFS_ISV4(dvp))
2678 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2679 return (error);
2680 }
2681
2682 /*
2683 * Nfs Version 3 and 4 commit rpc
2684 */
2685 int
2686 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
2687 struct thread *td)
2688 {
2689 struct nfsvattr nfsva;
2690 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2691 struct nfsnode *np;
2692 struct uio uio;
2693 int error, attrflag;
2694
2695 np = VTONFS(vp);
2696 error = EIO;
2697 attrflag = 0;
2698 if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) {
2699 uio.uio_offset = offset;
2700 uio.uio_resid = cnt;
2701 error = nfscl_doiods(vp, &uio, NULL, NULL,
2702 NFSV4OPEN_ACCESSWRITE, 1, cred, td);
2703 if (error != 0) {
2704 NFSLOCKNODE(np);
2705 np->n_flag &= ~NDSCOMMIT;
2706 NFSUNLOCKNODE(np);
2707 }
2708 }
2709 if (error != 0) {
2710 mtx_lock(&nmp->nm_mtx);
2711 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
2712 mtx_unlock(&nmp->nm_mtx);
2713 return (0);
2714 }
2715 mtx_unlock(&nmp->nm_mtx);
2716 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva,
2717 &attrflag, NULL);
2718 }
2719 if (attrflag != 0)
2720 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL,
2721 0, 1);
2722 if (error != 0 && NFS_ISV4(vp))
2723 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2724 return (error);
2725 }
2726
2727 /*
2728 * Strategy routine.
2729 * For async requests when nfsiod(s) are running, queue the request by
2730 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
2731 * request.
2732 */
2733 static int
2734 nfs_strategy(struct vop_strategy_args *ap)
2735 {
2736 struct buf *bp;
2737 struct vnode *vp;
2738 struct ucred *cr;
2739
2740 bp = ap->a_bp;
2741 vp = ap->a_vp;
2742 KASSERT(bp->b_vp == vp, ("missing b_getvp"));
2743 KASSERT(!(bp->b_flags & B_DONE),
2744 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
2745
2746 if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno)
2747 bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize /
2748 DEV_BSIZE);
2749 if (bp->b_iocmd == BIO_READ)
2750 cr = bp->b_rcred;
2751 else
2752 cr = bp->b_wcred;
2753
2754 /*
2755 * If the op is asynchronous and an i/o daemon is waiting
2756 * queue the request, wake it up and wait for completion
2757 * otherwise just do it ourselves.
2758 */
2759 if ((bp->b_flags & B_ASYNC) == 0 ||
2760 ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread))
2761 (void) ncl_doio(vp, bp, cr, curthread, 1);
2762 return (0);
2763 }
2764
2765 /*
2766 * fsync vnode op. Just call ncl_flush() with commit == 1.
2767 */
2768 /* ARGSUSED */
2769 static int
2770 nfs_fsync(struct vop_fsync_args *ap)
2771 {
2772
2773 if (ap->a_vp->v_type != VREG) {
2774 /*
2775 * For NFS, metadata is changed synchronously on the server,
2776 * so there is nothing to flush. Also, ncl_flush() clears
2777 * the NMODIFIED flag and that shouldn't be done here for
2778 * directories.
2779 */
2780 return (0);
2781 }
2782 return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0));
2783 }
2784
2785 /*
2786 * Flush all the blocks associated with a vnode.
2787 * Walk through the buffer pool and push any dirty pages
2788 * associated with the vnode.
2789 * If the called_from_renewthread argument is TRUE, it has been called
2790 * from the NFSv4 renew thread and, as such, cannot block indefinitely
2791 * waiting for a buffer write to complete.
2792 */
2793 int
2794 ncl_flush(struct vnode *vp, int waitfor, struct thread *td,
2795 int commit, int called_from_renewthread)
2796 {
2797 struct nfsnode *np = VTONFS(vp);
2798 struct buf *bp;
2799 int i;
2800 struct buf *nbp;
2801 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2802 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
2803 int passone = 1, trycnt = 0;
2804 u_quad_t off, endoff, toff;
2805 struct ucred* wcred = NULL;
2806 struct buf **bvec = NULL;
2807 struct bufobj *bo;
2808 #ifndef NFS_COMMITBVECSIZ
2809 #define NFS_COMMITBVECSIZ 20
2810 #endif
2811 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
2812 u_int bvecsize = 0, bveccount;
2813
2814 if (called_from_renewthread != 0)
2815 slptimeo = hz;
2816 if (nmp->nm_flag & NFSMNT_INT)
2817 slpflag = PCATCH;
2818 if (!commit)
2819 passone = 0;
2820 bo = &vp->v_bufobj;
2821 /*
2822 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
2823 * server, but has not been committed to stable storage on the server
2824 * yet. On the first pass, the byte range is worked out and the commit
2825 * rpc is done. On the second pass, ncl_writebp() is called to do the
2826 * job.
2827 */
2828 again:
2829 off = (u_quad_t)-1;
2830 endoff = 0;
2831 bvecpos = 0;
2832 if (NFS_ISV34(vp) && commit) {
2833 if (bvec != NULL && bvec != bvec_on_stack)
2834 free(bvec, M_TEMP);
2835 /*
2836 * Count up how many buffers waiting for a commit.
2837 */
2838 bveccount = 0;
2839 BO_LOCK(bo);
2840 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2841 if (!BUF_ISLOCKED(bp) &&
2842 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
2843 == (B_DELWRI | B_NEEDCOMMIT))
2844 bveccount++;
2845 }
2846 /*
2847 * Allocate space to remember the list of bufs to commit. It is
2848 * important to use M_NOWAIT here to avoid a race with nfs_write.
2849 * If we can't get memory (for whatever reason), we will end up
2850 * committing the buffers one-by-one in the loop below.
2851 */
2852 if (bveccount > NFS_COMMITBVECSIZ) {
2853 /*
2854 * Release the vnode interlock to avoid a lock
2855 * order reversal.
2856 */
2857 BO_UNLOCK(bo);
2858 bvec = (struct buf **)
2859 malloc(bveccount * sizeof(struct buf *),
2860 M_TEMP, M_NOWAIT);
2861 BO_LOCK(bo);
2862 if (bvec == NULL) {
2863 bvec = bvec_on_stack;
2864 bvecsize = NFS_COMMITBVECSIZ;
2865 } else
2866 bvecsize = bveccount;
2867 } else {
2868 bvec = bvec_on_stack;
2869 bvecsize = NFS_COMMITBVECSIZ;
2870 }
2871 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2872 if (bvecpos >= bvecsize)
2873 break;
2874 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2875 nbp = TAILQ_NEXT(bp, b_bobufs);
2876 continue;
2877 }
2878 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
2879 (B_DELWRI | B_NEEDCOMMIT)) {
2880 BUF_UNLOCK(bp);
2881 nbp = TAILQ_NEXT(bp, b_bobufs);
2882 continue;
2883 }
2884 BO_UNLOCK(bo);
2885 bremfree(bp);
2886 /*
2887 * Work out if all buffers are using the same cred
2888 * so we can deal with them all with one commit.
2889 *
2890 * NOTE: we are not clearing B_DONE here, so we have
2891 * to do it later on in this routine if we intend to
2892 * initiate I/O on the bp.
2893 *
2894 * Note: to avoid loopback deadlocks, we do not
2895 * assign b_runningbufspace.
2896 */
2897 if (wcred == NULL)
2898 wcred = bp->b_wcred;
2899 else if (wcred != bp->b_wcred)
2900 wcred = NOCRED;
2901 vfs_busy_pages(bp, 1);
2902
2903 BO_LOCK(bo);
2904 /*
2905 * bp is protected by being locked, but nbp is not
2906 * and vfs_busy_pages() may sleep. We have to
2907 * recalculate nbp.
2908 */
2909 nbp = TAILQ_NEXT(bp, b_bobufs);
2910
2911 /*
2912 * A list of these buffers is kept so that the
2913 * second loop knows which buffers have actually
2914 * been committed. This is necessary, since there
2915 * may be a race between the commit rpc and new
2916 * uncommitted writes on the file.
2917 */
2918 bvec[bvecpos++] = bp;
2919 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
2920 bp->b_dirtyoff;
2921 if (toff < off)
2922 off = toff;
2923 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
2924 if (toff > endoff)
2925 endoff = toff;
2926 }
2927 BO_UNLOCK(bo);
2928 }
2929 if (bvecpos > 0) {
2930 /*
2931 * Commit data on the server, as required.
2932 * If all bufs are using the same wcred, then use that with
2933 * one call for all of them, otherwise commit each one
2934 * separately.
2935 */
2936 if (wcred != NOCRED)
2937 retv = ncl_commit(vp, off, (int)(endoff - off),
2938 wcred, td);
2939 else {
2940 retv = 0;
2941 for (i = 0; i < bvecpos; i++) {
2942 off_t off, size;
2943 bp = bvec[i];
2944 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
2945 bp->b_dirtyoff;
2946 size = (u_quad_t)(bp->b_dirtyend
2947 - bp->b_dirtyoff);
2948 retv = ncl_commit(vp, off, (int)size,
2949 bp->b_wcred, td);
2950 if (retv) break;
2951 }
2952 }
2953
2954 if (retv == NFSERR_STALEWRITEVERF)
2955 ncl_clearcommit(vp->v_mount);
2956
2957 /*
2958 * Now, either mark the blocks I/O done or mark the
2959 * blocks dirty, depending on whether the commit
2960 * succeeded.
2961 */
2962 for (i = 0; i < bvecpos; i++) {
2963 bp = bvec[i];
2964 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
2965 if (retv) {
2966 /*
2967 * Error, leave B_DELWRI intact
2968 */
2969 vfs_unbusy_pages(bp);
2970 brelse(bp);
2971 } else {
2972 /*
2973 * Success, remove B_DELWRI ( bundirty() ).
2974 *
2975 * b_dirtyoff/b_dirtyend seem to be NFS
2976 * specific. We should probably move that
2977 * into bundirty(). XXX
2978 */
2979 bufobj_wref(bo);
2980 bp->b_flags |= B_ASYNC;
2981 bundirty(bp);
2982 bp->b_flags &= ~B_DONE;
2983 bp->b_ioflags &= ~BIO_ERROR;
2984 bp->b_dirtyoff = bp->b_dirtyend = 0;
2985 bufdone(bp);
2986 }
2987 }
2988 }
2989
2990 /*
2991 * Start/do any write(s) that are required.
2992 */
2993 loop:
2994 BO_LOCK(bo);
2995 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2996 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2997 if (waitfor != MNT_WAIT || passone)
2998 continue;
2999
3000 error = BUF_TIMELOCK(bp,
3001 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
3002 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo);
3003 if (error == 0) {
3004 BUF_UNLOCK(bp);
3005 goto loop;
3006 }
3007 if (error == ENOLCK) {
3008 error = 0;
3009 goto loop;
3010 }
3011 if (called_from_renewthread != 0) {
3012 /*
3013 * Return EIO so the flush will be retried
3014 * later.
3015 */
3016 error = EIO;
3017 goto done;
3018 }
3019 if (newnfs_sigintr(nmp, td)) {
3020 error = EINTR;
3021 goto done;
3022 }
3023 if (slpflag == PCATCH) {
3024 slpflag = 0;
3025 slptimeo = 2 * hz;
3026 }
3027 goto loop;
3028 }
3029 if ((bp->b_flags & B_DELWRI) == 0)
3030 panic("nfs_fsync: not dirty");
3031 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
3032 BUF_UNLOCK(bp);
3033 continue;
3034 }
3035 BO_UNLOCK(bo);
3036 bremfree(bp);
3037 bp->b_flags |= B_ASYNC;
3038 bwrite(bp);
3039 if (newnfs_sigintr(nmp, td)) {
3040 error = EINTR;
3041 goto done;
3042 }
3043 goto loop;
3044 }
3045 if (passone) {
3046 passone = 0;
3047 BO_UNLOCK(bo);
3048 goto again;
3049 }
3050 if (waitfor == MNT_WAIT) {
3051 while (bo->bo_numoutput) {
3052 error = bufobj_wwait(bo, slpflag, slptimeo);
3053 if (error) {
3054 BO_UNLOCK(bo);
3055 if (called_from_renewthread != 0) {
3056 /*
3057 * Return EIO so that the flush will be
3058 * retried later.
3059 */
3060 error = EIO;
3061 goto done;
3062 }
3063 error = newnfs_sigintr(nmp, td);
3064 if (error)
3065 goto done;
3066 if (slpflag == PCATCH) {
3067 slpflag = 0;
3068 slptimeo = 2 * hz;
3069 }
3070 BO_LOCK(bo);
3071 }
3072 }
3073 if (bo->bo_dirty.bv_cnt != 0 && commit) {
3074 BO_UNLOCK(bo);
3075 goto loop;
3076 }
3077 /*
3078 * Wait for all the async IO requests to drain
3079 */
3080 BO_UNLOCK(bo);
3081 NFSLOCKNODE(np);
3082 while (np->n_directio_asyncwr > 0) {
3083 np->n_flag |= NFSYNCWAIT;
3084 error = newnfs_msleep(td, &np->n_directio_asyncwr,
3085 &np->n_mtx, slpflag | (PRIBIO + 1),
3086 "nfsfsync", 0);
3087 if (error) {
3088 if (newnfs_sigintr(nmp, td)) {
3089 NFSUNLOCKNODE(np);
3090 error = EINTR;
3091 goto done;
3092 }
3093 }
3094 }
3095 NFSUNLOCKNODE(np);
3096 } else
3097 BO_UNLOCK(bo);
3098 if (NFSHASPNFS(nmp)) {
3099 nfscl_layoutcommit(vp, td);
3100 /*
3101 * Invalidate the attribute cache, since writes to a DS
3102 * won't update the size attribute.
3103 */
3104 NFSLOCKNODE(np);
3105 np->n_attrstamp = 0;
3106 } else
3107 NFSLOCKNODE(np);
3108 if (np->n_flag & NWRITEERR) {
3109 error = np->n_error;
3110 np->n_flag &= ~NWRITEERR;
3111 }
3112 if (commit && bo->bo_dirty.bv_cnt == 0 &&
3113 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
3114 np->n_flag &= ~NMODIFIED;
3115 NFSUNLOCKNODE(np);
3116 done:
3117 if (bvec != NULL && bvec != bvec_on_stack)
3118 free(bvec, M_TEMP);
3119 if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
3120 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 ||
3121 np->n_directio_asyncwr != 0)) {
3122 if (trycnt++ < 5) {
3123 /* try, try again... */
3124 passone = 1;
3125 wcred = NULL;
3126 bvec = NULL;
3127 bvecsize = 0;
3128 goto again;
3129 }
3130 vn_printf(vp, "ncl_flush failed");
3131 error = called_from_renewthread != 0 ? EIO : EBUSY;
3132 }
3133 return (error);
3134 }
3135
3136 /*
3137 * NFS advisory byte-level locks.
3138 */
3139 static int
3140 nfs_advlock(struct vop_advlock_args *ap)
3141 {
3142 struct vnode *vp = ap->a_vp;
3143 struct ucred *cred;
3144 struct nfsnode *np = VTONFS(ap->a_vp);
3145 struct proc *p = (struct proc *)ap->a_id;
3146 struct thread *td = curthread; /* XXX */
3147 struct vattr va;
3148 int ret, error;
3149 u_quad_t size;
3150
3151 error = NFSVOPLOCK(vp, LK_SHARED);
3152 if (error != 0)
3153 return (EBADF);
3154 if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
3155 if (vp->v_type != VREG) {
3156 error = EINVAL;
3157 goto out;
3158 }
3159 if ((ap->a_flags & F_POSIX) != 0)
3160 cred = p->p_ucred;
3161 else
3162 cred = td->td_ucred;
3163 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
3164 if (VN_IS_DOOMED(vp)) {
3165 error = EBADF;
3166 goto out;
3167 }
3168
3169 /*
3170 * If this is unlocking a write locked region, flush and
3171 * commit them before unlocking. This is required by
3172 * RFC3530 Sec. 9.3.2.
3173 */
3174 if (ap->a_op == F_UNLCK &&
3175 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
3176 ap->a_flags))
3177 (void) ncl_flush(vp, MNT_WAIT, td, 1, 0);
3178
3179 /*
3180 * Loop around doing the lock op, while a blocking lock
3181 * must wait for the lock op to succeed.
3182 */
3183 do {
3184 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
3185 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
3186 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3187 ap->a_op == F_SETLK) {
3188 NFSVOPUNLOCK(vp);
3189 error = nfs_catnap(PZERO | PCATCH, ret,
3190 "ncladvl");
3191 if (error)
3192 return (EINTR);
3193 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
3194 if (VN_IS_DOOMED(vp)) {
3195 error = EBADF;
3196 goto out;
3197 }
3198 }
3199 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3200 ap->a_op == F_SETLK);
3201 if (ret == NFSERR_DENIED) {
3202 error = EAGAIN;
3203 goto out;
3204 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
3205 error = ret;
3206 goto out;
3207 } else if (ret != 0) {
3208 error = EACCES;
3209 goto out;
3210 }
3211
3212 /*
3213 * Now, if we just got a lock, invalidate data in the buffer
3214 * cache, as required, so that the coherency conforms with
3215 * RFC3530 Sec. 9.3.2.
3216 */
3217 if (ap->a_op == F_SETLK) {
3218 if ((np->n_flag & NMODIFIED) == 0) {
3219 np->n_attrstamp = 0;
3220 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3221 ret = VOP_GETATTR(vp, &va, cred);
3222 }
3223 if ((np->n_flag & NMODIFIED) || ret ||
3224 np->n_change != va.va_filerev) {
3225 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
3226 np->n_attrstamp = 0;
3227 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3228 ret = VOP_GETATTR(vp, &va, cred);
3229 if (!ret) {
3230 np->n_mtime = va.va_mtime;
3231 np->n_change = va.va_filerev;
3232 }
3233 }
3234 /* Mark that a file lock has been acquired. */
3235 NFSLOCKNODE(np);
3236 np->n_flag |= NHASBEENLOCKED;
3237 NFSUNLOCKNODE(np);
3238 }
3239 } else if (!NFS_ISV4(vp)) {
3240 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
3241 size = VTONFS(vp)->n_size;
3242 NFSVOPUNLOCK(vp);
3243 error = lf_advlock(ap, &(vp->v_lockf), size);
3244 } else {
3245 if (nfs_advlock_p != NULL)
3246 error = nfs_advlock_p(ap);
3247 else {
3248 NFSVOPUNLOCK(vp);
3249 error = ENOLCK;
3250 }
3251 }
3252 if (error == 0 && ap->a_op == F_SETLK) {
3253 error = NFSVOPLOCK(vp, LK_SHARED);
3254 if (error == 0) {
3255 /* Mark that a file lock has been acquired. */
3256 NFSLOCKNODE(np);
3257 np->n_flag |= NHASBEENLOCKED;
3258 NFSUNLOCKNODE(np);
3259 NFSVOPUNLOCK(vp);
3260 }
3261 }
3262 return (error);
3263 } else
3264 error = EOPNOTSUPP;
3265 out:
3266 NFSVOPUNLOCK(vp);
3267 return (error);
3268 }
3269
3270 /*
3271 * NFS advisory byte-level locks.
3272 */
3273 static int
3274 nfs_advlockasync(struct vop_advlockasync_args *ap)
3275 {
3276 struct vnode *vp = ap->a_vp;
3277 u_quad_t size;
3278 int error;
3279
3280 if (NFS_ISV4(vp))
3281 return (EOPNOTSUPP);
3282 error = NFSVOPLOCK(vp, LK_SHARED);
3283 if (error)
3284 return (error);
3285 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
3286 size = VTONFS(vp)->n_size;
3287 NFSVOPUNLOCK(vp);
3288 error = lf_advlockasync(ap, &(vp->v_lockf), size);
3289 } else {
3290 NFSVOPUNLOCK(vp);
3291 error = EOPNOTSUPP;
3292 }
3293 return (error);
3294 }
3295
3296 /*
3297 * Print out the contents of an nfsnode.
3298 */
3299 static int
3300 nfs_print(struct vop_print_args *ap)
3301 {
3302 struct vnode *vp = ap->a_vp;
3303 struct nfsnode *np = VTONFS(vp);
3304
3305 printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid,
3306 (uintmax_t)np->n_vattr.na_fsid);
3307 if (vp->v_type == VFIFO)
3308 fifo_printinfo(vp);
3309 printf("\n");
3310 return (0);
3311 }
3312
3313 /*
3314 * This is the "real" nfs::bwrite(struct buf*).
3315 * We set B_CACHE if this is a VMIO buffer.
3316 */
3317 int
3318 ncl_writebp(struct buf *bp, int force __unused, struct thread *td)
3319 {
3320 int oldflags, rtval;
3321
3322 if (bp->b_flags & B_INVAL) {
3323 brelse(bp);
3324 return (0);
3325 }
3326
3327 oldflags = bp->b_flags;
3328 bp->b_flags |= B_CACHE;
3329
3330 /*
3331 * Undirty the bp. We will redirty it later if the I/O fails.
3332 */
3333 bundirty(bp);
3334 bp->b_flags &= ~B_DONE;
3335 bp->b_ioflags &= ~BIO_ERROR;
3336 bp->b_iocmd = BIO_WRITE;
3337
3338 bufobj_wref(bp->b_bufobj);
3339 curthread->td_ru.ru_oublock++;
3340
3341 /*
3342 * Note: to avoid loopback deadlocks, we do not
3343 * assign b_runningbufspace.
3344 */
3345 vfs_busy_pages(bp, 1);
3346
3347 BUF_KERNPROC(bp);
3348 bp->b_iooffset = dbtob(bp->b_blkno);
3349 bstrategy(bp);
3350
3351 if ((oldflags & B_ASYNC) != 0)
3352 return (0);
3353
3354 rtval = bufwait(bp);
3355 if (oldflags & B_DELWRI)
3356 reassignbuf(bp);
3357 brelse(bp);
3358 return (rtval);
3359 }
3360
3361 /*
3362 * nfs special file access vnode op.
3363 * Essentially just get vattr and then imitate iaccess() since the device is
3364 * local to the client.
3365 */
3366 static int
3367 nfsspec_access(struct vop_access_args *ap)
3368 {
3369 struct vattr *vap;
3370 struct ucred *cred = ap->a_cred;
3371 struct vnode *vp = ap->a_vp;
3372 accmode_t accmode = ap->a_accmode;
3373 struct vattr vattr;
3374 int error;
3375
3376 /*
3377 * Disallow write attempts on filesystems mounted read-only;
3378 * unless the file is a socket, fifo, or a block or character
3379 * device resident on the filesystem.
3380 */
3381 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
3382 switch (vp->v_type) {
3383 case VREG:
3384 case VDIR:
3385 case VLNK:
3386 return (EROFS);
3387 default:
3388 break;
3389 }
3390 }
3391 vap = &vattr;
3392 error = VOP_GETATTR(vp, vap, cred);
3393 if (error)
3394 goto out;
3395 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
3396 accmode, cred);
3397 out:
3398 return error;
3399 }
3400
3401 /*
3402 * Read wrapper for fifos.
3403 */
3404 static int
3405 nfsfifo_read(struct vop_read_args *ap)
3406 {
3407 struct nfsnode *np = VTONFS(ap->a_vp);
3408 int error;
3409
3410 /*
3411 * Set access flag.
3412 */
3413 NFSLOCKNODE(np);
3414 np->n_flag |= NACC;
3415 vfs_timestamp(&np->n_atim);
3416 NFSUNLOCKNODE(np);
3417 error = fifo_specops.vop_read(ap);
3418 return error;
3419 }
3420
3421 /*
3422 * Write wrapper for fifos.
3423 */
3424 static int
3425 nfsfifo_write(struct vop_write_args *ap)
3426 {
3427 struct nfsnode *np = VTONFS(ap->a_vp);
3428
3429 /*
3430 * Set update flag.
3431 */
3432 NFSLOCKNODE(np);
3433 np->n_flag |= NUPD;
3434 vfs_timestamp(&np->n_mtim);
3435 NFSUNLOCKNODE(np);
3436 return(fifo_specops.vop_write(ap));
3437 }
3438
3439 /*
3440 * Close wrapper for fifos.
3441 *
3442 * Update the times on the nfsnode then do fifo close.
3443 */
3444 static int
3445 nfsfifo_close(struct vop_close_args *ap)
3446 {
3447 struct vnode *vp = ap->a_vp;
3448 struct nfsnode *np = VTONFS(vp);
3449 struct vattr vattr;
3450 struct timespec ts;
3451
3452 NFSLOCKNODE(np);
3453 if (np->n_flag & (NACC | NUPD)) {
3454 vfs_timestamp(&ts);
3455 if (np->n_flag & NACC)
3456 np->n_atim = ts;
3457 if (np->n_flag & NUPD)
3458 np->n_mtim = ts;
3459 np->n_flag |= NCHG;
3460 if (vrefcnt(vp) == 1 &&
3461 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
3462 VATTR_NULL(&vattr);
3463 if (np->n_flag & NACC)
3464 vattr.va_atime = np->n_atim;
3465 if (np->n_flag & NUPD)
3466 vattr.va_mtime = np->n_mtim;
3467 NFSUNLOCKNODE(np);
3468 (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
3469 goto out;
3470 }
3471 }
3472 NFSUNLOCKNODE(np);
3473 out:
3474 return (fifo_specops.vop_close(ap));
3475 }
3476
3477 /*
3478 * Just call ncl_writebp() with the force argument set to 1.
3479 *
3480 * NOTE: B_DONE may or may not be set in a_bp on call.
3481 */
3482 static int
3483 nfs_bwrite(struct buf *bp)
3484 {
3485
3486 return (ncl_writebp(bp, 1, curthread));
3487 }
3488
3489 struct buf_ops buf_ops_newnfs = {
3490 .bop_name = "buf_ops_nfs",
3491 .bop_write = nfs_bwrite,
3492 .bop_strategy = bufstrategy,
3493 .bop_sync = bufsync,
3494 .bop_bdflush = bufbdflush,
3495 };
3496
3497 static int
3498 nfs_getacl(struct vop_getacl_args *ap)
3499 {
3500 int error;
3501
3502 if (ap->a_type != ACL_TYPE_NFS4)
3503 return (EOPNOTSUPP);
3504 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
3505 NULL);
3506 if (error > NFSERR_STALE) {
3507 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3508 error = EPERM;
3509 }
3510 return (error);
3511 }
3512
3513 static int
3514 nfs_setacl(struct vop_setacl_args *ap)
3515 {
3516 int error;
3517
3518 if (ap->a_type != ACL_TYPE_NFS4)
3519 return (EOPNOTSUPP);
3520 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
3521 NULL);
3522 if (error > NFSERR_STALE) {
3523 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3524 error = EPERM;
3525 }
3526 return (error);
3527 }
3528
3529 /*
3530 * VOP_ADVISE for NFS.
3531 * Just return 0 for any errors, since it is just a hint.
3532 */
3533 static int
3534 nfs_advise(struct vop_advise_args *ap)
3535 {
3536 struct thread *td = curthread;
3537 struct nfsmount *nmp;
3538 uint64_t len;
3539 int error;
3540
3541 /*
3542 * First do vop_stdadvise() to handle the buffer cache.
3543 */
3544 error = vop_stdadvise(ap);
3545 if (error != 0)
3546 return (error);
3547 if (ap->a_start < 0 || ap->a_end < 0)
3548 return (0);
3549 if (ap->a_end == OFF_MAX)
3550 len = 0;
3551 else if (ap->a_end < ap->a_start)
3552 return (0);
3553 else
3554 len = ap->a_end - ap->a_start + 1;
3555 nmp = VFSTONFS(ap->a_vp->v_mount);
3556 mtx_lock(&nmp->nm_mtx);
3557 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
3558 (NFSHASPNFS(nmp) && (nmp->nm_privflag & NFSMNTP_IOADVISETHRUMDS) ==
3559 0) || (nmp->nm_privflag & NFSMNTP_NOADVISE) != 0) {
3560 mtx_unlock(&nmp->nm_mtx);
3561 return (0);
3562 }
3563 mtx_unlock(&nmp->nm_mtx);
3564 error = nfsrpc_advise(ap->a_vp, ap->a_start, len, ap->a_advice,
3565 td->td_ucred, td);
3566 if (error == NFSERR_NOTSUPP) {
3567 mtx_lock(&nmp->nm_mtx);
3568 nmp->nm_privflag |= NFSMNTP_NOADVISE;
3569 mtx_unlock(&nmp->nm_mtx);
3570 }
3571 return (0);
3572 }
3573
3574 /*
3575 * nfs allocate call
3576 */
3577 static int
3578 nfs_allocate(struct vop_allocate_args *ap)
3579 {
3580 struct vnode *vp = ap->a_vp;
3581 struct thread *td = curthread;
3582 struct nfsvattr nfsva;
3583 struct nfsmount *nmp;
3584 int attrflag, error, ret;
3585
3586 attrflag = 0;
3587 nmp = VFSTONFS(vp->v_mount);
3588 mtx_lock(&nmp->nm_mtx);
3589 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION &&
3590 (nmp->nm_privflag & NFSMNTP_NOALLOCATE) == 0) {
3591 mtx_unlock(&nmp->nm_mtx);
3592 /*
3593 * Flush first to ensure that the allocate adds to the
3594 * file's allocation on the server.
3595 */
3596 error = ncl_flush(vp, MNT_WAIT, td, 1, 0);
3597 if (error == 0)
3598 error = nfsrpc_allocate(vp, *ap->a_offset, *ap->a_len,
3599 &nfsva, &attrflag, td->td_ucred, td, NULL);
3600 if (error == 0) {
3601 *ap->a_offset += *ap->a_len;
3602 *ap->a_len = 0;
3603 } else if (error == NFSERR_NOTSUPP) {
3604 mtx_lock(&nmp->nm_mtx);
3605 nmp->nm_privflag |= NFSMNTP_NOALLOCATE;
3606 mtx_unlock(&nmp->nm_mtx);
3607 }
3608 } else {
3609 mtx_unlock(&nmp->nm_mtx);
3610 error = EIO;
3611 }
3612 /*
3613 * If the NFS server cannot perform the Allocate operation, just call
3614 * vop_stdallocate() to perform it.
3615 */
3616 if (error != 0)
3617 error = vop_stdallocate(ap);
3618 if (attrflag != 0) {
3619 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
3620 if (error == 0 && ret != 0)
3621 error = ret;
3622 }
3623 if (error != 0)
3624 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
3625 return (error);
3626 }
3627
3628 /*
3629 * nfs copy_file_range call
3630 */
3631 static int
3632 nfs_copy_file_range(struct vop_copy_file_range_args *ap)
3633 {
3634 struct vnode *invp = ap->a_invp;
3635 struct vnode *outvp = ap->a_outvp;
3636 struct mount *mp;
3637 struct nfsvattr innfsva, outnfsva;
3638 struct vattr *vap;
3639 struct uio io;
3640 struct nfsmount *nmp;
3641 size_t len, len2;
3642 int error, inattrflag, outattrflag, ret, ret2;
3643 off_t inoff, outoff;
3644 bool consecutive, must_commit, tryoutcred;
3645
3646 ret = ret2 = 0;
3647 nmp = VFSTONFS(invp->v_mount);
3648 mtx_lock(&nmp->nm_mtx);
3649 /* NFSv4.2 Copy is not permitted for infile == outfile. */
3650 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
3651 (nmp->nm_privflag & NFSMNTP_NOCOPY) != 0 || invp == outvp) {
3652 mtx_unlock(&nmp->nm_mtx);
3653 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp,
3654 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags,
3655 ap->a_incred, ap->a_outcred, ap->a_fsizetd);
3656 return (error);
3657 }
3658 mtx_unlock(&nmp->nm_mtx);
3659
3660 /* Lock both vnodes, avoiding risk of deadlock. */
3661 do {
3662 mp = NULL;
3663 error = vn_start_write(outvp, &mp, V_WAIT);
3664 if (error == 0) {
3665 error = vn_lock(outvp, LK_EXCLUSIVE);
3666 if (error == 0) {
3667 error = vn_lock(invp, LK_SHARED | LK_NOWAIT);
3668 if (error == 0)
3669 break;
3670 VOP_UNLOCK(outvp);
3671 if (mp != NULL)
3672 vn_finished_write(mp);
3673 mp = NULL;
3674 error = vn_lock(invp, LK_SHARED);
3675 if (error == 0)
3676 VOP_UNLOCK(invp);
3677 }
3678 }
3679 if (mp != NULL)
3680 vn_finished_write(mp);
3681 } while (error == 0);
3682 if (error != 0)
3683 return (error);
3684
3685 /*
3686 * Do the vn_rlimit_fsize() check. Should this be above the VOP layer?
3687 */
3688 io.uio_offset = *ap->a_outoffp;
3689 io.uio_resid = *ap->a_lenp;
3690 error = vn_rlimit_fsize(outvp, &io, ap->a_fsizetd);
3691
3692 /*
3693 * Flush the input file so that the data is up to date before
3694 * the copy. Flush writes for the output file so that they
3695 * do not overwrite the data copied to the output file by the Copy.
3696 * Set the commit argument for both flushes so that the data is on
3697 * stable storage before the Copy RPC. This is done in case the
3698 * server reboots during the Copy and needs to be redone.
3699 */
3700 if (error == 0)
3701 error = ncl_flush(invp, MNT_WAIT, curthread, 1, 0);
3702 if (error == 0)
3703 error = ncl_flush(outvp, MNT_WAIT, curthread, 1, 0);
3704
3705 /* Do the actual NFSv4.2 RPC. */
3706 len = *ap->a_lenp;
3707 mtx_lock(&nmp->nm_mtx);
3708 if ((nmp->nm_privflag & NFSMNTP_NOCONSECUTIVE) == 0)
3709 consecutive = true;
3710 else
3711 consecutive = false;
3712 mtx_unlock(&nmp->nm_mtx);
3713 inoff = *ap->a_inoffp;
3714 outoff = *ap->a_outoffp;
3715 tryoutcred = true;
3716 must_commit = false;
3717 if (error == 0) {
3718 vap = &VTONFS(invp)->n_vattr.na_vattr;
3719 error = VOP_GETATTR(invp, vap, ap->a_incred);
3720 if (error == 0) {
3721 /*
3722 * Clip "len" at va_size so that RFC compliant servers
3723 * will not reply NFSERR_INVAL.
3724 * Setting "len == 0" for the RPC would be preferred,
3725 * but some Linux servers do not support that.
3726 */
3727 if (inoff >= vap->va_size)
3728 *ap->a_lenp = len = 0;
3729 else if (inoff + len > vap->va_size)
3730 *ap->a_lenp = len = vap->va_size - inoff;
3731 } else
3732 error = 0;
3733 }
3734
3735 /*
3736 * len will be set to 0 upon a successful Copy RPC.
3737 * As such, this only loops when the Copy RPC needs to be retried.
3738 */
3739 while (len > 0 && error == 0) {
3740 inattrflag = outattrflag = 0;
3741 len2 = len;
3742 if (tryoutcred)
3743 error = nfsrpc_copy_file_range(invp, ap->a_inoffp,
3744 outvp, ap->a_outoffp, &len2, ap->a_flags,
3745 &inattrflag, &innfsva, &outattrflag, &outnfsva,
3746 ap->a_outcred, consecutive, &must_commit);
3747 else
3748 error = nfsrpc_copy_file_range(invp, ap->a_inoffp,
3749 outvp, ap->a_outoffp, &len2, ap->a_flags,
3750 &inattrflag, &innfsva, &outattrflag, &outnfsva,
3751 ap->a_incred, consecutive, &must_commit);
3752 if (inattrflag != 0)
3753 ret = nfscl_loadattrcache(&invp, &innfsva, NULL, NULL,
3754 0, 1);
3755 if (outattrflag != 0)
3756 ret2 = nfscl_loadattrcache(&outvp, &outnfsva, NULL,
3757 NULL, 1, 1);
3758 if (error == 0) {
3759 if (consecutive == false) {
3760 if (len2 == len) {
3761 mtx_lock(&nmp->nm_mtx);
3762 nmp->nm_privflag |=
3763 NFSMNTP_NOCONSECUTIVE;
3764 mtx_unlock(&nmp->nm_mtx);
3765 } else
3766 error = NFSERR_OFFLOADNOREQS;
3767 }
3768 *ap->a_lenp = len2;
3769 len = 0;
3770 if (len2 > 0 && must_commit && error == 0)
3771 error = ncl_commit(outvp, outoff, *ap->a_lenp,
3772 ap->a_outcred, curthread);
3773 if (error == 0 && ret != 0)
3774 error = ret;
3775 if (error == 0 && ret2 != 0)
3776 error = ret2;
3777 } else if (error == NFSERR_OFFLOADNOREQS && consecutive) {
3778 /*
3779 * Try consecutive == false, which is ok only if all
3780 * bytes are copied.
3781 * If only some bytes were copied when consecutive
3782 * is false, there is no way to know which bytes
3783 * still need to be written.
3784 */
3785 consecutive = false;
3786 error = 0;
3787 } else if (error == NFSERR_ACCES && tryoutcred) {
3788 /* Try again with incred. */
3789 tryoutcred = false;
3790 error = 0;
3791 }
3792 if (error == NFSERR_STALEWRITEVERF) {
3793 /*
3794 * Server rebooted, so do it all again.
3795 */
3796 *ap->a_inoffp = inoff;
3797 *ap->a_outoffp = outoff;
3798 len = *ap->a_lenp;
3799 must_commit = false;
3800 error = 0;
3801 }
3802 }
3803 VOP_UNLOCK(invp);
3804 VOP_UNLOCK(outvp);
3805 if (mp != NULL)
3806 vn_finished_write(mp);
3807 if (error == NFSERR_NOTSUPP || error == NFSERR_OFFLOADNOREQS ||
3808 error == NFSERR_ACCES) {
3809 /*
3810 * Unlike the NFSv4.2 Copy, vn_generic_copy_file_range() can
3811 * use a_incred for the read and a_outcred for the write, so
3812 * try this for NFSERR_ACCES failures for the Copy.
3813 * For NFSERR_NOTSUPP and NFSERR_OFFLOADNOREQS, the Copy can
3814 * never succeed, so disable it.
3815 */
3816 if (error != NFSERR_ACCES) {
3817 /* Can never do Copy on this mount. */
3818 mtx_lock(&nmp->nm_mtx);
3819 nmp->nm_privflag |= NFSMNTP_NOCOPY;
3820 mtx_unlock(&nmp->nm_mtx);
3821 }
3822 *ap->a_inoffp = inoff;
3823 *ap->a_outoffp = outoff;
3824 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp,
3825 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags,
3826 ap->a_incred, ap->a_outcred, ap->a_fsizetd);
3827 } else if (error != 0)
3828 *ap->a_lenp = 0;
3829
3830 if (error != 0)
3831 error = nfscl_maperr(curthread, error, (uid_t)0, (gid_t)0);
3832 return (error);
3833 }
3834
3835 /*
3836 * nfs ioctl call
3837 */
3838 static int
3839 nfs_ioctl(struct vop_ioctl_args *ap)
3840 {
3841 struct vnode *vp = ap->a_vp;
3842 struct nfsvattr nfsva;
3843 struct nfsmount *nmp;
3844 int attrflag, content, error, ret;
3845 bool eof = false; /* shut up compiler. */
3846
3847 if (vp->v_type != VREG)
3848 return (ENOTTY);
3849 nmp = VFSTONFS(vp->v_mount);
3850 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION) {
3851 error = vop_stdioctl(ap);
3852 return (error);
3853 }
3854
3855 /* Do the actual NFSv4.2 RPC. */
3856 switch (ap->a_command) {
3857 case FIOSEEKDATA:
3858 content = NFSV4CONTENT_DATA;
3859 break;
3860 case FIOSEEKHOLE:
3861 content = NFSV4CONTENT_HOLE;
3862 break;
3863 default:
3864 return (ENOTTY);
3865 }
3866
3867 error = vn_lock(vp, LK_SHARED);
3868 if (error != 0)
3869 return (EBADF);
3870 attrflag = 0;
3871 if (*((off_t *)ap->a_data) >= VTONFS(vp)->n_size)
3872 error = ENXIO;
3873 else {
3874 /*
3875 * Flush all writes, so that the server is up to date.
3876 * Although a Commit is not required, the commit argument
3877 * is set so that, for a pNFS File/Flexible File Layout
3878 * server, the LayoutCommit will be done to ensure the file
3879 * size is up to date on the Metadata Server.
3880 */
3881 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 1, 0);
3882 if (error == 0)
3883 error = nfsrpc_seek(vp, (off_t *)ap->a_data, &eof,
3884 content, ap->a_cred, &nfsva, &attrflag);
3885 /* If at eof for FIOSEEKDATA, return ENXIO. */
3886 if (eof && error == 0 && content == NFSV4CONTENT_DATA)
3887 error = ENXIO;
3888 }
3889 if (attrflag != 0) {
3890 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
3891 if (error == 0 && ret != 0)
3892 error = ret;
3893 }
3894 NFSVOPUNLOCK(vp);
3895
3896 if (error != 0)
3897 error = ENXIO;
3898 return (error);
3899 }
3900
3901 /*
3902 * nfs getextattr call
3903 */
3904 static int
3905 nfs_getextattr(struct vop_getextattr_args *ap)
3906 {
3907 struct vnode *vp = ap->a_vp;
3908 struct nfsmount *nmp;
3909 struct ucred *cred;
3910 struct thread *td = ap->a_td;
3911 struct nfsvattr nfsva;
3912 ssize_t len;
3913 int attrflag, error, ret;
3914
3915 nmp = VFSTONFS(vp->v_mount);
3916 mtx_lock(&nmp->nm_mtx);
3917 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
3918 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
3919 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
3920 mtx_unlock(&nmp->nm_mtx);
3921 return (EOPNOTSUPP);
3922 }
3923 mtx_unlock(&nmp->nm_mtx);
3924
3925 cred = ap->a_cred;
3926 if (cred == NULL)
3927 cred = td->td_ucred;
3928 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
3929 attrflag = 0;
3930 error = nfsrpc_getextattr(vp, ap->a_name, ap->a_uio, &len, &nfsva,
3931 &attrflag, cred, td);
3932 if (attrflag != 0) {
3933 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
3934 if (error == 0 && ret != 0)
3935 error = ret;
3936 }
3937 if (error == 0 && ap->a_size != NULL)
3938 *ap->a_size = len;
3939
3940 switch (error) {
3941 case NFSERR_NOTSUPP:
3942 case NFSERR_OPILLEGAL:
3943 mtx_lock(&nmp->nm_mtx);
3944 nmp->nm_privflag |= NFSMNTP_NOXATTR;
3945 mtx_unlock(&nmp->nm_mtx);
3946 error = EOPNOTSUPP;
3947 break;
3948 case NFSERR_NOXATTR:
3949 case NFSERR_XATTR2BIG:
3950 error = ENOATTR;
3951 break;
3952 default:
3953 error = nfscl_maperr(td, error, 0, 0);
3954 break;
3955 }
3956 return (error);
3957 }
3958
3959 /*
3960 * nfs setextattr call
3961 */
3962 static int
3963 nfs_setextattr(struct vop_setextattr_args *ap)
3964 {
3965 struct vnode *vp = ap->a_vp;
3966 struct nfsmount *nmp;
3967 struct ucred *cred;
3968 struct thread *td = ap->a_td;
3969 struct nfsvattr nfsva;
3970 int attrflag, error, ret;
3971
3972 nmp = VFSTONFS(vp->v_mount);
3973 mtx_lock(&nmp->nm_mtx);
3974 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
3975 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
3976 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
3977 mtx_unlock(&nmp->nm_mtx);
3978 return (EOPNOTSUPP);
3979 }
3980 mtx_unlock(&nmp->nm_mtx);
3981
3982 if (ap->a_uio->uio_resid < 0)
3983 return (EINVAL);
3984 cred = ap->a_cred;
3985 if (cred == NULL)
3986 cred = td->td_ucred;
3987 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
3988 attrflag = 0;
3989 error = nfsrpc_setextattr(vp, ap->a_name, ap->a_uio, &nfsva,
3990 &attrflag, cred, td);
3991 if (attrflag != 0) {
3992 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
3993 if (error == 0 && ret != 0)
3994 error = ret;
3995 }
3996
3997 switch (error) {
3998 case NFSERR_NOTSUPP:
3999 case NFSERR_OPILLEGAL:
4000 mtx_lock(&nmp->nm_mtx);
4001 nmp->nm_privflag |= NFSMNTP_NOXATTR;
4002 mtx_unlock(&nmp->nm_mtx);
4003 error = EOPNOTSUPP;
4004 break;
4005 case NFSERR_NOXATTR:
4006 case NFSERR_XATTR2BIG:
4007 error = ENOATTR;
4008 break;
4009 default:
4010 error = nfscl_maperr(td, error, 0, 0);
4011 break;
4012 }
4013 return (error);
4014 }
4015
4016 /*
4017 * nfs listextattr call
4018 */
4019 static int
4020 nfs_listextattr(struct vop_listextattr_args *ap)
4021 {
4022 struct vnode *vp = ap->a_vp;
4023 struct nfsmount *nmp;
4024 struct ucred *cred;
4025 struct thread *td = ap->a_td;
4026 struct nfsvattr nfsva;
4027 size_t len, len2;
4028 uint64_t cookie;
4029 int attrflag, error, ret;
4030 bool eof;
4031
4032 nmp = VFSTONFS(vp->v_mount);
4033 mtx_lock(&nmp->nm_mtx);
4034 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4035 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4036 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4037 mtx_unlock(&nmp->nm_mtx);
4038 return (EOPNOTSUPP);
4039 }
4040 mtx_unlock(&nmp->nm_mtx);
4041
4042 cred = ap->a_cred;
4043 if (cred == NULL)
4044 cred = td->td_ucred;
4045
4046 /* Loop around doing List Extended Attribute RPCs. */
4047 eof = false;
4048 cookie = 0;
4049 len2 = 0;
4050 error = 0;
4051 while (!eof && error == 0) {
4052 len = nmp->nm_rsize;
4053 attrflag = 0;
4054 error = nfsrpc_listextattr(vp, &cookie, ap->a_uio, &len, &eof,
4055 &nfsva, &attrflag, cred, td);
4056 if (attrflag != 0) {
4057 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
4058 1);
4059 if (error == 0 && ret != 0)
4060 error = ret;
4061 }
4062 if (error == 0) {
4063 len2 += len;
4064 if (len2 > SSIZE_MAX)
4065 error = ENOATTR;
4066 }
4067 }
4068 if (error == 0 && ap->a_size != NULL)
4069 *ap->a_size = len2;
4070
4071 switch (error) {
4072 case NFSERR_NOTSUPP:
4073 case NFSERR_OPILLEGAL:
4074 mtx_lock(&nmp->nm_mtx);
4075 nmp->nm_privflag |= NFSMNTP_NOXATTR;
4076 mtx_unlock(&nmp->nm_mtx);
4077 error = EOPNOTSUPP;
4078 break;
4079 case NFSERR_NOXATTR:
4080 case NFSERR_XATTR2BIG:
4081 error = ENOATTR;
4082 break;
4083 default:
4084 error = nfscl_maperr(td, error, 0, 0);
4085 break;
4086 }
4087 return (error);
4088 }
4089
4090 /*
4091 * nfs setextattr call
4092 */
4093 static int
4094 nfs_deleteextattr(struct vop_deleteextattr_args *ap)
4095 {
4096 struct vnode *vp = ap->a_vp;
4097 struct nfsmount *nmp;
4098 struct nfsvattr nfsva;
4099 int attrflag, error, ret;
4100
4101 nmp = VFSTONFS(vp->v_mount);
4102 mtx_lock(&nmp->nm_mtx);
4103 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4104 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4105 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4106 mtx_unlock(&nmp->nm_mtx);
4107 return (EOPNOTSUPP);
4108 }
4109 mtx_unlock(&nmp->nm_mtx);
4110
4111 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
4112 attrflag = 0;
4113 error = nfsrpc_rmextattr(vp, ap->a_name, &nfsva, &attrflag, ap->a_cred,
4114 ap->a_td);
4115 if (attrflag != 0) {
4116 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
4117 if (error == 0 && ret != 0)
4118 error = ret;
4119 }
4120
4121 switch (error) {
4122 case NFSERR_NOTSUPP:
4123 case NFSERR_OPILLEGAL:
4124 mtx_lock(&nmp->nm_mtx);
4125 nmp->nm_privflag |= NFSMNTP_NOXATTR;
4126 mtx_unlock(&nmp->nm_mtx);
4127 error = EOPNOTSUPP;
4128 break;
4129 case NFSERR_NOXATTR:
4130 case NFSERR_XATTR2BIG:
4131 error = ENOATTR;
4132 break;
4133 default:
4134 error = nfscl_maperr(ap->a_td, error, 0, 0);
4135 break;
4136 }
4137 return (error);
4138 }
4139
4140 /*
4141 * Return POSIX pathconf information applicable to nfs filesystems.
4142 */
4143 static int
4144 nfs_pathconf(struct vop_pathconf_args *ap)
4145 {
4146 struct nfsv3_pathconf pc;
4147 struct nfsvattr nfsva;
4148 struct vnode *vp = ap->a_vp;
4149 struct nfsmount *nmp;
4150 struct thread *td = curthread;
4151 off_t off;
4152 bool eof;
4153 int attrflag, error;
4154
4155 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX ||
4156 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
4157 ap->a_name == _PC_NO_TRUNC)) ||
4158 (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) {
4159 /*
4160 * Since only the above 4 a_names are returned by the NFSv3
4161 * Pathconf RPC, there is no point in doing it for others.
4162 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can
4163 * be used for _PC_NFS4_ACL as well.
4164 */
4165 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva,
4166 &attrflag, NULL);
4167 if (attrflag != 0)
4168 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
4169 1);
4170 if (error != 0)
4171 return (error);
4172 } else {
4173 /*
4174 * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
4175 * just fake them.
4176 */
4177 pc.pc_linkmax = NFS_LINK_MAX;
4178 pc.pc_namemax = NFS_MAXNAMLEN;
4179 pc.pc_notrunc = 1;
4180 pc.pc_chownrestricted = 1;
4181 pc.pc_caseinsensitive = 0;
4182 pc.pc_casepreserving = 1;
4183 error = 0;
4184 }
4185 switch (ap->a_name) {
4186 case _PC_LINK_MAX:
4187 #ifdef _LP64
4188 *ap->a_retval = pc.pc_linkmax;
4189 #else
4190 *ap->a_retval = MIN(LONG_MAX, pc.pc_linkmax);
4191 #endif
4192 break;
4193 case _PC_NAME_MAX:
4194 *ap->a_retval = pc.pc_namemax;
4195 break;
4196 case _PC_PIPE_BUF:
4197 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO)
4198 *ap->a_retval = PIPE_BUF;
4199 else
4200 error = EINVAL;
4201 break;
4202 case _PC_CHOWN_RESTRICTED:
4203 *ap->a_retval = pc.pc_chownrestricted;
4204 break;
4205 case _PC_NO_TRUNC:
4206 *ap->a_retval = pc.pc_notrunc;
4207 break;
4208 case _PC_ACL_NFS4:
4209 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
4210 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
4211 *ap->a_retval = 1;
4212 else
4213 *ap->a_retval = 0;
4214 break;
4215 case _PC_ACL_PATH_MAX:
4216 if (NFS_ISV4(vp))
4217 *ap->a_retval = ACL_MAX_ENTRIES;
4218 else
4219 *ap->a_retval = 3;
4220 break;
4221 case _PC_PRIO_IO:
4222 *ap->a_retval = 0;
4223 break;
4224 case _PC_SYNC_IO:
4225 *ap->a_retval = 0;
4226 break;
4227 case _PC_ALLOC_SIZE_MIN:
4228 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
4229 break;
4230 case _PC_FILESIZEBITS:
4231 if (NFS_ISV34(vp))
4232 *ap->a_retval = 64;
4233 else
4234 *ap->a_retval = 32;
4235 break;
4236 case _PC_REC_INCR_XFER_SIZE:
4237 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
4238 break;
4239 case _PC_REC_MAX_XFER_SIZE:
4240 *ap->a_retval = -1; /* means ``unlimited'' */
4241 break;
4242 case _PC_REC_MIN_XFER_SIZE:
4243 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
4244 break;
4245 case _PC_REC_XFER_ALIGN:
4246 *ap->a_retval = PAGE_SIZE;
4247 break;
4248 case _PC_SYMLINK_MAX:
4249 *ap->a_retval = NFS_MAXPATHLEN;
4250 break;
4251 case _PC_MIN_HOLE_SIZE:
4252 /* Only some NFSv4.2 servers support Seek for Holes. */
4253 *ap->a_retval = 0;
4254 nmp = VFSTONFS(vp->v_mount);
4255 if (NFS_ISV4(vp) && nmp->nm_minorvers == NFSV42_MINORVERSION) {
4256 /*
4257 * NFSv4.2 doesn't have an attribute for hole size,
4258 * so all we can do is see if the Seek operation is
4259 * supported and then use f_iosize as a "best guess".
4260 */
4261 mtx_lock(&nmp->nm_mtx);
4262 if ((nmp->nm_privflag & NFSMNTP_SEEKTESTED) == 0) {
4263 mtx_unlock(&nmp->nm_mtx);
4264 off = 0;
4265 attrflag = 0;
4266 error = nfsrpc_seek(vp, &off, &eof,
4267 NFSV4CONTENT_HOLE, td->td_ucred, &nfsva,
4268 &attrflag);
4269 if (attrflag != 0)
4270 nfscl_loadattrcache(&vp, &nfsva,
4271 NULL, NULL, 0, 1);
4272 mtx_lock(&nmp->nm_mtx);
4273 if (error == NFSERR_NOTSUPP)
4274 nmp->nm_privflag |= NFSMNTP_SEEKTESTED;
4275 else
4276 nmp->nm_privflag |= NFSMNTP_SEEKTESTED |
4277 NFSMNTP_SEEK;
4278 error = 0;
4279 }
4280 if ((nmp->nm_privflag & NFSMNTP_SEEK) != 0)
4281 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
4282 mtx_unlock(&nmp->nm_mtx);
4283 }
4284 break;
4285
4286 default:
4287 error = vop_stdpathconf(ap);
4288 break;
4289 }
4290 return (error);
4291 }
Cache object: 6bad577d4b91e3509a27bf0a6af770dc
|