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 /*
39 * vnode op calls for Sun NFS version 2, 3 and 4
40 */
41
42 #include "opt_inet.h"
43
44 #include <sys/param.h>
45 #include <sys/kernel.h>
46 #include <sys/systm.h>
47 #include <sys/resourcevar.h>
48 #include <sys/proc.h>
49 #include <sys/mount.h>
50 #include <sys/bio.h>
51 #include <sys/buf.h>
52 #include <sys/extattr.h>
53 #include <sys/filio.h>
54 #include <sys/jail.h>
55 #include <sys/malloc.h>
56 #include <sys/mbuf.h>
57 #include <sys/namei.h>
58 #include <sys/socket.h>
59 #include <sys/vnode.h>
60 #include <sys/dirent.h>
61 #include <sys/fcntl.h>
62 #include <sys/lockf.h>
63 #include <sys/stat.h>
64 #include <sys/sysctl.h>
65 #include <sys/signalvar.h>
66
67 #include <vm/vm.h>
68 #include <vm/vm_extern.h>
69 #include <vm/vm_object.h>
70 #include <vm/vnode_pager.h>
71
72 #include <fs/nfs/nfsport.h>
73 #include <fs/nfsclient/nfsnode.h>
74 #include <fs/nfsclient/nfsmount.h>
75 #include <fs/nfsclient/nfs.h>
76 #include <fs/nfsclient/nfs_kdtrace.h>
77
78 #include <net/if.h>
79 #include <netinet/in.h>
80 #include <netinet/in_var.h>
81
82 #include <nfs/nfs_lock.h>
83
84 #ifdef KDTRACE_HOOKS
85 #include <sys/dtrace_bsd.h>
86
87 dtrace_nfsclient_accesscache_flush_probe_func_t
88 dtrace_nfscl_accesscache_flush_done_probe;
89 uint32_t nfscl_accesscache_flush_done_id;
90
91 dtrace_nfsclient_accesscache_get_probe_func_t
92 dtrace_nfscl_accesscache_get_hit_probe,
93 dtrace_nfscl_accesscache_get_miss_probe;
94 uint32_t nfscl_accesscache_get_hit_id;
95 uint32_t nfscl_accesscache_get_miss_id;
96
97 dtrace_nfsclient_accesscache_load_probe_func_t
98 dtrace_nfscl_accesscache_load_done_probe;
99 uint32_t nfscl_accesscache_load_done_id;
100 #endif /* !KDTRACE_HOOKS */
101
102 /* Defs */
103 #define TRUE 1
104 #define FALSE 0
105
106 extern struct nfsstatsv1 nfsstatsv1;
107 extern int nfsrv_useacl;
108 extern int nfscl_debuglevel;
109 MALLOC_DECLARE(M_NEWNFSREQ);
110
111 static vop_read_t nfsfifo_read;
112 static vop_write_t nfsfifo_write;
113 static vop_close_t nfsfifo_close;
114 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
115 struct thread *);
116 static vop_lookup_t nfs_lookup;
117 static vop_create_t nfs_create;
118 static vop_mknod_t nfs_mknod;
119 static vop_open_t nfs_open;
120 static vop_pathconf_t nfs_pathconf;
121 static vop_close_t nfs_close;
122 static vop_access_t nfs_access;
123 static vop_getattr_t nfs_getattr;
124 static vop_setattr_t nfs_setattr;
125 static vop_read_t nfs_read;
126 static vop_fsync_t nfs_fsync;
127 static vop_remove_t nfs_remove;
128 static vop_link_t nfs_link;
129 static vop_rename_t nfs_rename;
130 static vop_mkdir_t nfs_mkdir;
131 static vop_rmdir_t nfs_rmdir;
132 static vop_symlink_t nfs_symlink;
133 static vop_readdir_t nfs_readdir;
134 static vop_strategy_t nfs_strategy;
135 static int nfs_lookitup(struct vnode *, char *, int,
136 struct ucred *, struct thread *, struct nfsnode **);
137 static int nfs_sillyrename(struct vnode *, struct vnode *,
138 struct componentname *);
139 static vop_access_t nfsspec_access;
140 static vop_readlink_t nfs_readlink;
141 static vop_print_t nfs_print;
142 static vop_advlock_t nfs_advlock;
143 static vop_advlockasync_t nfs_advlockasync;
144 static vop_getacl_t nfs_getacl;
145 static vop_setacl_t nfs_setacl;
146 static vop_advise_t nfs_advise;
147 static vop_allocate_t nfs_allocate;
148 static vop_deallocate_t nfs_deallocate;
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_deallocate = nfs_deallocate,
197 .vop_copy_file_range = nfs_copy_file_range,
198 .vop_ioctl = nfs_ioctl,
199 .vop_getextattr = nfs_getextattr,
200 .vop_setextattr = nfs_setextattr,
201 .vop_listextattr = nfs_listextattr,
202 .vop_deleteextattr = nfs_deleteextattr,
203 };
204 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops_nosig);
205
206 static int
nfs_vnodeops_bypass(struct vop_generic_args * a)207 nfs_vnodeops_bypass(struct vop_generic_args *a)
208 {
209
210 return (vop_sigdefer(&newnfs_vnodeops_nosig, a));
211 }
212
213 struct vop_vector newnfs_vnodeops = {
214 .vop_default = &default_vnodeops,
215 .vop_bypass = nfs_vnodeops_bypass,
216 };
217 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops);
218
219 static struct vop_vector newnfs_fifoops_nosig = {
220 .vop_default = &fifo_specops,
221 .vop_access = nfsspec_access,
222 .vop_close = nfsfifo_close,
223 .vop_fsync = nfs_fsync,
224 .vop_getattr = nfs_getattr,
225 .vop_inactive = ncl_inactive,
226 .vop_pathconf = nfs_pathconf,
227 .vop_print = nfs_print,
228 .vop_read = nfsfifo_read,
229 .vop_reclaim = ncl_reclaim,
230 .vop_setattr = nfs_setattr,
231 .vop_write = nfsfifo_write,
232 };
233 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops_nosig);
234
235 static int
nfs_fifoops_bypass(struct vop_generic_args * a)236 nfs_fifoops_bypass(struct vop_generic_args *a)
237 {
238
239 return (vop_sigdefer(&newnfs_fifoops_nosig, a));
240 }
241
242 struct vop_vector newnfs_fifoops = {
243 .vop_default = &default_vnodeops,
244 .vop_bypass = nfs_fifoops_bypass,
245 };
246 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops);
247
248 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
249 struct componentname *cnp, struct vattr *vap);
250 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
251 int namelen, struct ucred *cred, struct thread *td);
252 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp,
253 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp,
254 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td);
255 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp,
256 struct componentname *scnp, struct sillyrename *sp);
257
258 /*
259 * Global variables
260 */
261 SYSCTL_DECL(_vfs_nfs);
262
263 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
264 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
265 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
266
267 static int nfs_prime_access_cache = 0;
268 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
269 &nfs_prime_access_cache, 0,
270 "Prime NFS ACCESS cache when fetching attributes");
271
272 static int newnfs_commit_on_close = 0;
273 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW,
274 &newnfs_commit_on_close, 0, "write+commit on close, else only write");
275
276 static int nfs_clean_pages_on_close = 1;
277 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
278 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
279
280 int newnfs_directio_enable = 0;
281 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
282 &newnfs_directio_enable, 0, "Enable NFS directio");
283
284 int nfs_keep_dirty_on_error;
285 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW,
286 &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned");
287
288 /*
289 * This sysctl allows other processes to mmap a file that has been opened
290 * O_DIRECT by a process. In general, having processes mmap the file while
291 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow
292 * this by default to prevent DoS attacks - to prevent a malicious user from
293 * opening up files O_DIRECT preventing other users from mmap'ing these
294 * files. "Protected" environments where stricter consistency guarantees are
295 * required can disable this knob. The process that opened the file O_DIRECT
296 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
297 * meaningful.
298 */
299 int newnfs_directio_allow_mmap = 1;
300 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
301 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
302
303 static uint64_t nfs_maxalloclen = 64 * 1024 * 1024;
304 SYSCTL_U64(_vfs_nfs, OID_AUTO, maxalloclen, CTLFLAG_RW,
305 &nfs_maxalloclen, 0, "NFS max allocate/deallocate length");
306
307 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \
308 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \
309 | NFSACCESS_DELETE | NFSACCESS_LOOKUP)
310
311 /*
312 * SMP Locking Note :
313 * The list of locks after the description of the lock is the ordering
314 * of other locks acquired with the lock held.
315 * np->n_mtx : Protects the fields in the nfsnode.
316 VM Object Lock
317 VI_MTX (acquired indirectly)
318 * nmp->nm_mtx : Protects the fields in the nfsmount.
319 rep->r_mtx
320 * ncl_iod_mutex : Global lock, protects shared nfsiod state.
321 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
322 nmp->nm_mtx
323 rep->r_mtx
324 * rep->r_mtx : Protects the fields in an nfsreq.
325 */
326
327 static int
nfs_lock(struct vop_lock1_args * ap)328 nfs_lock(struct vop_lock1_args *ap)
329 {
330 struct vnode *vp;
331 struct nfsnode *np;
332 u_quad_t nsize;
333 int error, lktype;
334 bool onfault;
335
336 vp = ap->a_vp;
337 lktype = ap->a_flags & LK_TYPE_MASK;
338 error = VOP_LOCK1_APV(&default_vnodeops, ap);
339 if (error != 0 || vp->v_op != &newnfs_vnodeops)
340 return (error);
341 np = VTONFS(vp);
342 if (np == NULL)
343 return (0);
344 NFSLOCKNODE(np);
345 if ((np->n_flag & NVNSETSZSKIP) == 0 || (lktype != LK_SHARED &&
346 lktype != LK_EXCLUSIVE && lktype != LK_UPGRADE &&
347 lktype != LK_TRYUPGRADE)) {
348 NFSUNLOCKNODE(np);
349 return (0);
350 }
351 onfault = (ap->a_flags & LK_EATTR_MASK) == LK_NOWAIT &&
352 (ap->a_flags & LK_INIT_MASK) == LK_CANRECURSE &&
353 (lktype == LK_SHARED || lktype == LK_EXCLUSIVE);
354 if (onfault && vp->v_vnlock->lk_recurse == 0) {
355 /*
356 * Force retry in vm_fault(), to make the lock request
357 * sleepable, which allows us to piggy-back the
358 * sleepable call to vnode_pager_setsize().
359 */
360 NFSUNLOCKNODE(np);
361 VOP_UNLOCK(vp);
362 return (EBUSY);
363 }
364 if ((ap->a_flags & LK_NOWAIT) != 0 ||
365 (lktype == LK_SHARED && vp->v_vnlock->lk_recurse > 0)) {
366 NFSUNLOCKNODE(np);
367 return (0);
368 }
369 if (lktype == LK_SHARED) {
370 NFSUNLOCKNODE(np);
371 VOP_UNLOCK(vp);
372 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK);
373 ap->a_flags |= LK_EXCLUSIVE;
374 error = VOP_LOCK1_APV(&default_vnodeops, ap);
375 if (error != 0 || vp->v_op != &newnfs_vnodeops)
376 return (error);
377 if (vp->v_data == NULL)
378 goto downgrade;
379 MPASS(vp->v_data == np);
380 NFSLOCKNODE(np);
381 if ((np->n_flag & NVNSETSZSKIP) == 0) {
382 NFSUNLOCKNODE(np);
383 goto downgrade;
384 }
385 }
386 np->n_flag &= ~NVNSETSZSKIP;
387 nsize = np->n_size;
388 NFSUNLOCKNODE(np);
389 vnode_pager_setsize(vp, nsize);
390 downgrade:
391 if (lktype == LK_SHARED) {
392 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK);
393 ap->a_flags |= LK_DOWNGRADE;
394 (void)VOP_LOCK1_APV(&default_vnodeops, ap);
395 }
396 return (0);
397 }
398
399 static int
nfs34_access_otw(struct vnode * vp,int wmode,struct thread * td,struct ucred * cred,u_int32_t * retmode)400 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td,
401 struct ucred *cred, u_int32_t *retmode)
402 {
403 int error = 0, attrflag, i, lrupos;
404 u_int32_t rmode;
405 struct nfsnode *np = VTONFS(vp);
406 struct nfsvattr nfsva;
407
408 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag,
409 &rmode);
410 if (attrflag)
411 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
412 if (!error) {
413 lrupos = 0;
414 NFSLOCKNODE(np);
415 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
416 if (np->n_accesscache[i].uid == cred->cr_uid) {
417 np->n_accesscache[i].mode = rmode;
418 np->n_accesscache[i].stamp = time_second;
419 break;
420 }
421 if (i > 0 && np->n_accesscache[i].stamp <
422 np->n_accesscache[lrupos].stamp)
423 lrupos = i;
424 }
425 if (i == NFS_ACCESSCACHESIZE) {
426 np->n_accesscache[lrupos].uid = cred->cr_uid;
427 np->n_accesscache[lrupos].mode = rmode;
428 np->n_accesscache[lrupos].stamp = time_second;
429 }
430 NFSUNLOCKNODE(np);
431 if (retmode != NULL)
432 *retmode = rmode;
433 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0);
434 } else if (NFS_ISV4(vp)) {
435 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
436 }
437 #ifdef KDTRACE_HOOKS
438 if (error != 0)
439 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0,
440 error);
441 #endif
442 return (error);
443 }
444
445 /*
446 * nfs access vnode op.
447 * For nfs version 2, just return ok. File accesses may fail later.
448 * For nfs version 3, use the access rpc to check accessibility. If file modes
449 * are changed on the server, accesses might still fail later.
450 */
451 static int
nfs_access(struct vop_access_args * ap)452 nfs_access(struct vop_access_args *ap)
453 {
454 struct vnode *vp = ap->a_vp;
455 int error = 0, i, gotahit;
456 u_int32_t mode, wmode, rmode;
457 int v34 = NFS_ISV34(vp);
458 struct nfsnode *np = VTONFS(vp);
459
460 /*
461 * Disallow write attempts on filesystems mounted read-only;
462 * unless the file is a socket, fifo, or a block or character
463 * device resident on the filesystem.
464 */
465 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS |
466 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL |
467 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) {
468 switch (vp->v_type) {
469 case VREG:
470 case VDIR:
471 case VLNK:
472 return (EROFS);
473 default:
474 break;
475 }
476 }
477 /*
478 * For nfs v3 or v4, check to see if we have done this recently, and if
479 * so return our cached result instead of making an ACCESS call.
480 * If not, do an access rpc, otherwise you are stuck emulating
481 * ufs_access() locally using the vattr. This may not be correct,
482 * since the server may apply other access criteria such as
483 * client uid-->server uid mapping that we do not know about.
484 */
485 if (v34) {
486 if (ap->a_accmode & VREAD)
487 mode = NFSACCESS_READ;
488 else
489 mode = 0;
490 if (vp->v_type != VDIR) {
491 if (ap->a_accmode & VWRITE)
492 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
493 if (ap->a_accmode & VAPPEND)
494 mode |= NFSACCESS_EXTEND;
495 if (ap->a_accmode & VEXEC)
496 mode |= NFSACCESS_EXECUTE;
497 if (ap->a_accmode & VDELETE)
498 mode |= NFSACCESS_DELETE;
499 } else {
500 if (ap->a_accmode & VWRITE)
501 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
502 if (ap->a_accmode & VAPPEND)
503 mode |= NFSACCESS_EXTEND;
504 if (ap->a_accmode & VEXEC)
505 mode |= NFSACCESS_LOOKUP;
506 if (ap->a_accmode & VDELETE)
507 mode |= NFSACCESS_DELETE;
508 if (ap->a_accmode & VDELETE_CHILD)
509 mode |= NFSACCESS_MODIFY;
510 }
511 /* XXX safety belt, only make blanket request if caching */
512 if (nfsaccess_cache_timeout > 0) {
513 wmode = NFSACCESS_READ | NFSACCESS_MODIFY |
514 NFSACCESS_EXTEND | NFSACCESS_EXECUTE |
515 NFSACCESS_DELETE | NFSACCESS_LOOKUP;
516 } else {
517 wmode = mode;
518 }
519
520 /*
521 * Does our cached result allow us to give a definite yes to
522 * this request?
523 */
524 gotahit = 0;
525 NFSLOCKNODE(np);
526 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
527 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
528 if (time_second < (np->n_accesscache[i].stamp
529 + nfsaccess_cache_timeout) &&
530 (np->n_accesscache[i].mode & mode) == mode) {
531 NFSINCRGLOBAL(nfsstatsv1.accesscache_hits);
532 gotahit = 1;
533 }
534 break;
535 }
536 }
537 NFSUNLOCKNODE(np);
538 #ifdef KDTRACE_HOOKS
539 if (gotahit != 0)
540 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp,
541 ap->a_cred->cr_uid, mode);
542 else
543 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp,
544 ap->a_cred->cr_uid, mode);
545 #endif
546 if (gotahit == 0) {
547 /*
548 * Either a no, or a don't know. Go to the wire.
549 */
550 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses);
551 error = nfs34_access_otw(vp, wmode, ap->a_td,
552 ap->a_cred, &rmode);
553 if (!error &&
554 (rmode & mode) != mode)
555 error = EACCES;
556 }
557 return (error);
558 } else {
559 if ((error = nfsspec_access(ap)) != 0) {
560 return (error);
561 }
562 /*
563 * Attempt to prevent a mapped root from accessing a file
564 * which it shouldn't. We try to read a byte from the file
565 * if the user is root and the file is not zero length.
566 * After calling nfsspec_access, we should have the correct
567 * file size cached.
568 */
569 NFSLOCKNODE(np);
570 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
571 && VTONFS(vp)->n_size > 0) {
572 struct iovec aiov;
573 struct uio auio;
574 char buf[1];
575
576 NFSUNLOCKNODE(np);
577 aiov.iov_base = buf;
578 aiov.iov_len = 1;
579 auio.uio_iov = &aiov;
580 auio.uio_iovcnt = 1;
581 auio.uio_offset = 0;
582 auio.uio_resid = 1;
583 auio.uio_segflg = UIO_SYSSPACE;
584 auio.uio_rw = UIO_READ;
585 auio.uio_td = ap->a_td;
586
587 if (vp->v_type == VREG)
588 error = ncl_readrpc(vp, &auio, ap->a_cred);
589 else if (vp->v_type == VDIR) {
590 char* bp;
591 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
592 aiov.iov_base = bp;
593 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
594 error = ncl_readdirrpc(vp, &auio, ap->a_cred,
595 ap->a_td);
596 free(bp, M_TEMP);
597 } else if (vp->v_type == VLNK)
598 error = ncl_readlinkrpc(vp, &auio, ap->a_cred);
599 else
600 error = EACCES;
601 } else
602 NFSUNLOCKNODE(np);
603 return (error);
604 }
605 }
606
607 /*
608 * nfs open vnode op
609 * Check to see if the type is ok
610 * and that deletion is not in progress.
611 * For paged in text files, you will need to flush the page cache
612 * if consistency is lost.
613 */
614 /* ARGSUSED */
615 static int
nfs_open(struct vop_open_args * ap)616 nfs_open(struct vop_open_args *ap)
617 {
618 struct vnode *vp = ap->a_vp;
619 struct nfsnode *np = VTONFS(vp);
620 struct vattr vattr;
621 int error;
622 int fmode = ap->a_mode;
623 struct ucred *cred;
624 vm_object_t obj;
625
626 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
627 return (EOPNOTSUPP);
628
629 /*
630 * For NFSv4, we need to do the Open Op before cache validation,
631 * so that we conform to RFC3530 Sec. 9.3.1.
632 */
633 if (NFS_ISV4(vp)) {
634 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);
635 if (error) {
636 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
637 (gid_t)0);
638 return (error);
639 }
640 }
641
642 /*
643 * Now, if this Open will be doing reading, re-validate/flush the
644 * cache, so that Close/Open coherency is maintained.
645 */
646 NFSLOCKNODE(np);
647 if (np->n_flag & NMODIFIED) {
648 NFSUNLOCKNODE(np);
649 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
650 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
651 if (VN_IS_DOOMED(vp))
652 return (EBADF);
653 }
654 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
655 if (error == EINTR || error == EIO) {
656 if (NFS_ISV4(vp))
657 (void) nfsrpc_close(vp, 0, ap->a_td);
658 return (error);
659 }
660 NFSLOCKNODE(np);
661 np->n_attrstamp = 0;
662 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
663 if (vp->v_type == VDIR)
664 np->n_direofoffset = 0;
665 NFSUNLOCKNODE(np);
666 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
667 if (error) {
668 if (NFS_ISV4(vp))
669 (void) nfsrpc_close(vp, 0, ap->a_td);
670 return (error);
671 }
672 NFSLOCKNODE(np);
673 np->n_mtime = vattr.va_mtime;
674 if (NFS_ISV4(vp))
675 np->n_change = vattr.va_filerev;
676 } else {
677 NFSUNLOCKNODE(np);
678 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
679 if (error) {
680 if (NFS_ISV4(vp))
681 (void) nfsrpc_close(vp, 0, ap->a_td);
682 return (error);
683 }
684 NFSLOCKNODE(np);
685 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) ||
686 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
687 if (vp->v_type == VDIR)
688 np->n_direofoffset = 0;
689 NFSUNLOCKNODE(np);
690 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
691 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
692 if (VN_IS_DOOMED(vp))
693 return (EBADF);
694 }
695 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
696 if (error == EINTR || error == EIO) {
697 if (NFS_ISV4(vp))
698 (void) nfsrpc_close(vp, 0, ap->a_td);
699 return (error);
700 }
701 NFSLOCKNODE(np);
702 np->n_mtime = vattr.va_mtime;
703 if (NFS_ISV4(vp))
704 np->n_change = vattr.va_filerev;
705 }
706 }
707
708 /*
709 * If the object has >= 1 O_DIRECT active opens, we disable caching.
710 */
711 if (newnfs_directio_enable && (fmode & O_DIRECT) &&
712 (vp->v_type == VREG)) {
713 if (np->n_directio_opens == 0) {
714 NFSUNLOCKNODE(np);
715 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
716 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
717 if (VN_IS_DOOMED(vp))
718 return (EBADF);
719 }
720 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
721 if (error) {
722 if (NFS_ISV4(vp))
723 (void) nfsrpc_close(vp, 0, ap->a_td);
724 return (error);
725 }
726 NFSLOCKNODE(np);
727 np->n_flag |= NNONCACHE;
728 }
729 np->n_directio_opens++;
730 }
731
732 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */
733 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0)
734 np->n_flag |= NWRITEOPENED;
735
736 /*
737 * If this is an open for writing, capture a reference to the
738 * credentials, so they can be used by ncl_putpages(). Using
739 * these write credentials is preferable to the credentials of
740 * whatever thread happens to be doing the VOP_PUTPAGES() since
741 * the write RPCs are less likely to fail with EACCES.
742 */
743 if ((fmode & FWRITE) != 0) {
744 cred = np->n_writecred;
745 np->n_writecred = crhold(ap->a_cred);
746 } else
747 cred = NULL;
748 NFSUNLOCKNODE(np);
749
750 if (cred != NULL)
751 crfree(cred);
752 vnode_create_vobject(vp, vattr.va_size, ap->a_td);
753
754 /*
755 * If the text file has been mmap'd, flush any dirty pages to the
756 * buffer cache and then...
757 * Make sure all writes are pushed to the NFS server. If this is not
758 * done, the modify time of the file can change while the text
759 * file is being executed. This will cause the process that is
760 * executing the text file to be terminated.
761 */
762 if (vp->v_writecount <= -1) {
763 if ((obj = vp->v_object) != NULL &&
764 vm_object_mightbedirty(obj)) {
765 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
766 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
767 if (VN_IS_DOOMED(vp))
768 return (EBADF);
769 }
770 vnode_pager_clean_sync(vp);
771 }
772
773 /* Now, flush the buffer cache. */
774 ncl_flush(vp, MNT_WAIT, curthread, 0, 0);
775
776 /* And, finally, make sure that n_mtime is up to date. */
777 np = VTONFS(vp);
778 NFSLOCKNODE(np);
779 np->n_mtime = np->n_vattr.na_mtime;
780 NFSUNLOCKNODE(np);
781 }
782 return (0);
783 }
784
785 /*
786 * nfs close vnode op
787 * What an NFS client should do upon close after writing is a debatable issue.
788 * Most NFS clients push delayed writes to the server upon close, basically for
789 * two reasons:
790 * 1 - So that any write errors may be reported back to the client process
791 * doing the close system call. By far the two most likely errors are
792 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
793 * 2 - To put a worst case upper bound on cache inconsistency between
794 * multiple clients for the file.
795 * There is also a consistency problem for Version 2 of the protocol w.r.t.
796 * not being able to tell if other clients are writing a file concurrently,
797 * since there is no way of knowing if the changed modify time in the reply
798 * is only due to the write for this client.
799 * (NFS Version 3 provides weak cache consistency data in the reply that
800 * should be sufficient to detect and handle this case.)
801 *
802 * The current code does the following:
803 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
804 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
805 * or commit them (this satisfies 1 and 2 except for the
806 * case where the server crashes after this close but
807 * before the commit RPC, which is felt to be "good
808 * enough". Changing the last argument to ncl_flush() to
809 * a 1 would force a commit operation, if it is felt a
810 * commit is necessary now.
811 * for NFS Version 4 - flush the dirty buffers and commit them, if
812 * nfscl_mustflush() says this is necessary.
813 * It is necessary if there is no write delegation held,
814 * in order to satisfy open/close coherency.
815 * If the file isn't cached on local stable storage,
816 * it may be necessary in order to detect "out of space"
817 * errors from the server, if the write delegation
818 * issued by the server doesn't allow the file to grow.
819 */
820 /* ARGSUSED */
821 static int
nfs_close(struct vop_close_args * ap)822 nfs_close(struct vop_close_args *ap)
823 {
824 struct vnode *vp = ap->a_vp;
825 struct nfsnode *np = VTONFS(vp);
826 struct nfsvattr nfsva;
827 struct ucred *cred;
828 int error = 0, ret, localcred = 0;
829 int fmode = ap->a_fflag;
830
831 if (NFSCL_FORCEDISM(vp->v_mount))
832 return (0);
833 /*
834 * During shutdown, a_cred isn't valid, so just use root.
835 */
836 if (ap->a_cred == NOCRED) {
837 cred = newnfs_getcred();
838 localcred = 1;
839 } else {
840 cred = ap->a_cred;
841 }
842 if (vp->v_type == VREG) {
843 /*
844 * Examine and clean dirty pages, regardless of NMODIFIED.
845 * This closes a major hole in close-to-open consistency.
846 * We want to push out all dirty pages (and buffers) on
847 * close, regardless of whether they were dirtied by
848 * mmap'ed writes or via write().
849 */
850 if (nfs_clean_pages_on_close && vp->v_object) {
851 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
852 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
853 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK)
854 return (EBADF);
855 }
856 vnode_pager_clean_async(vp);
857 }
858 NFSLOCKNODE(np);
859 if (np->n_flag & NMODIFIED) {
860 NFSUNLOCKNODE(np);
861 if (NFS_ISV3(vp)) {
862 /*
863 * Under NFSv3 we have dirty buffers to dispose of. We
864 * must flush them to the NFS server. We have the option
865 * of waiting all the way through the commit rpc or just
866 * waiting for the initial write. The default is to only
867 * wait through the initial write so the data is in the
868 * server's cache, which is roughly similar to the state
869 * a standard disk subsystem leaves the file in on close().
870 *
871 * We cannot clear the NMODIFIED bit in np->n_flag due to
872 * potential races with other processes, and certainly
873 * cannot clear it if we don't commit.
874 * These races occur when there is no longer the old
875 * traditional vnode locking implemented for Vnode Ops.
876 */
877 int cm = newnfs_commit_on_close ? 1 : 0;
878 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
879 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
880 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK)
881 return (EBADF);
882 }
883 error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0);
884 /* np->n_flag &= ~NMODIFIED; */
885 } else if (NFS_ISV4(vp)) {
886 if (nfscl_mustflush(vp) != 0) {
887 int cm = newnfs_commit_on_close ? 1 : 0;
888 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
889 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
890 if (VN_IS_DOOMED(vp) && ap->a_fflag !=
891 FNONBLOCK)
892 return (EBADF);
893 }
894 error = ncl_flush(vp, MNT_WAIT, ap->a_td,
895 cm, 0);
896 /*
897 * as above w.r.t races when clearing
898 * NMODIFIED.
899 * np->n_flag &= ~NMODIFIED;
900 */
901 }
902 } else {
903 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
904 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
905 if (VN_IS_DOOMED(vp) && ap->a_fflag !=
906 FNONBLOCK)
907 return (EBADF);
908 }
909 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
910 }
911 NFSLOCKNODE(np);
912 }
913 /*
914 * Invalidate the attribute cache in all cases.
915 * An open is going to fetch fresh attrs any way, other procs
916 * on this node that have file open will be forced to do an
917 * otw attr fetch, but this is safe.
918 * --> A user found that their RPC count dropped by 20% when
919 * this was commented out and I can't see any requirement
920 * for it, so I've disabled it when negative lookups are
921 * enabled. (What does this have to do with negative lookup
922 * caching? Well nothing, except it was reported by the
923 * same user that needed negative lookup caching and I wanted
924 * there to be a way to disable it to see if it
925 * is the cause of some caching/coherency issue that might
926 * crop up.)
927 */
928 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) {
929 np->n_attrstamp = 0;
930 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
931 }
932 if (np->n_flag & NWRITEERR) {
933 np->n_flag &= ~NWRITEERR;
934 error = np->n_error;
935 }
936 NFSUNLOCKNODE(np);
937 }
938
939 if (NFS_ISV4(vp)) {
940 /*
941 * Get attributes so "change" is up to date.
942 */
943 if (error == 0 && nfscl_mustflush(vp) != 0 &&
944 vp->v_type == VREG &&
945 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) {
946 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva);
947 if (!ret) {
948 np->n_change = nfsva.na_filerev;
949 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
950 0, 0);
951 }
952 }
953
954 /*
955 * and do the close.
956 */
957 ret = nfsrpc_close(vp, 0, ap->a_td);
958 if (!error && ret)
959 error = ret;
960 if (error)
961 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
962 (gid_t)0);
963 }
964 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
965 NFSLOCKNODE(np);
966 KASSERT((np->n_directio_opens > 0),
967 ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
968 np->n_directio_opens--;
969 if (np->n_directio_opens == 0)
970 np->n_flag &= ~NNONCACHE;
971 NFSUNLOCKNODE(np);
972 }
973 if (localcred)
974 NFSFREECRED(cred);
975 return (error);
976 }
977
978 /*
979 * nfs getattr call from vfs.
980 */
981 static int
nfs_getattr(struct vop_getattr_args * ap)982 nfs_getattr(struct vop_getattr_args *ap)
983 {
984 struct vnode *vp = ap->a_vp;
985 struct thread *td = curthread; /* XXX */
986 struct nfsnode *np = VTONFS(vp);
987 int error = 0;
988 struct nfsvattr nfsva;
989 struct vattr *vap = ap->a_vap;
990 struct vattr vattr;
991 struct nfsmount *nmp;
992
993 nmp = VFSTONFS(vp->v_mount);
994 /*
995 * Update local times for special files.
996 */
997 NFSLOCKNODE(np);
998 if (np->n_flag & (NACC | NUPD))
999 np->n_flag |= NCHG;
1000 NFSUNLOCKNODE(np);
1001 /*
1002 * First look in the cache.
1003 * For "syskrb5" mounts, nm_fhsize might still be zero and
1004 * cached attributes should be ignored.
1005 */
1006 if (nmp->nm_fhsize > 0 && ncl_getattrcache(vp, &vattr) == 0) {
1007 ncl_copy_vattr(vap, &vattr);
1008
1009 /*
1010 * Get the local modify time for the case of a write
1011 * delegation.
1012 */
1013 nfscl_deleggetmodtime(vp, &vap->va_mtime);
1014 return (0);
1015 }
1016
1017 if (NFS_ISV34(vp) && nfs_prime_access_cache &&
1018 nfsaccess_cache_timeout > 0) {
1019 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses);
1020 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
1021 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
1022 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
1023 return (0);
1024 }
1025 }
1026 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva);
1027 if (!error)
1028 error = nfscl_loadattrcache(&vp, &nfsva, vap, 0, 0);
1029 if (!error) {
1030 /*
1031 * Get the local modify time for the case of a write
1032 * delegation.
1033 */
1034 nfscl_deleggetmodtime(vp, &vap->va_mtime);
1035 } else if (NFS_ISV4(vp)) {
1036 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1037 }
1038 return (error);
1039 }
1040
1041 /*
1042 * nfs setattr call.
1043 */
1044 static int
nfs_setattr(struct vop_setattr_args * ap)1045 nfs_setattr(struct vop_setattr_args *ap)
1046 {
1047 struct vnode *vp = ap->a_vp;
1048 struct nfsnode *np = VTONFS(vp);
1049 struct thread *td = curthread; /* XXX */
1050 struct vattr *vap = ap->a_vap;
1051 int error = 0;
1052 u_quad_t tsize;
1053 struct timespec ts;
1054
1055 #ifndef nolint
1056 tsize = (u_quad_t)0;
1057 #endif
1058
1059 /*
1060 * Setting of flags and marking of atimes are not supported.
1061 */
1062 if (vap->va_flags != VNOVAL)
1063 return (EOPNOTSUPP);
1064
1065 /*
1066 * Disallow write attempts if the filesystem is mounted read-only.
1067 */
1068 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
1069 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
1070 vap->va_mtime.tv_sec != VNOVAL ||
1071 vap->va_birthtime.tv_sec != VNOVAL ||
1072 vap->va_mode != (mode_t)VNOVAL) &&
1073 (vp->v_mount->mnt_flag & MNT_RDONLY))
1074 return (EROFS);
1075 if (vap->va_size != VNOVAL) {
1076 switch (vp->v_type) {
1077 case VDIR:
1078 return (EISDIR);
1079 case VCHR:
1080 case VBLK:
1081 case VSOCK:
1082 case VFIFO:
1083 if (vap->va_mtime.tv_sec == VNOVAL &&
1084 vap->va_atime.tv_sec == VNOVAL &&
1085 vap->va_birthtime.tv_sec == VNOVAL &&
1086 vap->va_mode == (mode_t)VNOVAL &&
1087 vap->va_uid == (uid_t)VNOVAL &&
1088 vap->va_gid == (gid_t)VNOVAL)
1089 return (0);
1090 vap->va_size = VNOVAL;
1091 break;
1092 default:
1093 /*
1094 * Disallow write attempts if the filesystem is
1095 * mounted read-only.
1096 */
1097 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1098 return (EROFS);
1099 /*
1100 * We run vnode_pager_setsize() early (why?),
1101 * we must set np->n_size now to avoid vinvalbuf
1102 * V_SAVE races that might setsize a lower
1103 * value.
1104 */
1105 NFSLOCKNODE(np);
1106 tsize = np->n_size;
1107 NFSUNLOCKNODE(np);
1108 error = ncl_meta_setsize(vp, td, vap->va_size);
1109 NFSLOCKNODE(np);
1110 if (np->n_flag & NMODIFIED) {
1111 tsize = np->n_size;
1112 NFSUNLOCKNODE(np);
1113 error = ncl_vinvalbuf(vp, vap->va_size == 0 ?
1114 0 : V_SAVE, td, 1);
1115 if (error != 0) {
1116 vnode_pager_setsize(vp, tsize);
1117 return (error);
1118 }
1119 /*
1120 * Call nfscl_delegmodtime() to set the modify time
1121 * locally, as required.
1122 */
1123 nfscl_delegmodtime(vp);
1124 } else
1125 NFSUNLOCKNODE(np);
1126 /*
1127 * np->n_size has already been set to vap->va_size
1128 * in ncl_meta_setsize(). We must set it again since
1129 * nfs_loadattrcache() could be called through
1130 * ncl_meta_setsize() and could modify np->n_size.
1131 */
1132 NFSLOCKNODE(np);
1133 np->n_vattr.na_size = np->n_size = vap->va_size;
1134 NFSUNLOCKNODE(np);
1135 }
1136 } else {
1137 NFSLOCKNODE(np);
1138 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) &&
1139 (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
1140 NFSUNLOCKNODE(np);
1141 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
1142 if (error == EINTR || error == EIO)
1143 return (error);
1144 } else
1145 NFSUNLOCKNODE(np);
1146 }
1147 error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
1148 if (vap->va_size != VNOVAL) {
1149 if (error == 0) {
1150 nanouptime(&ts);
1151 NFSLOCKNODE(np);
1152 np->n_localmodtime = ts;
1153 NFSUNLOCKNODE(np);
1154 } else {
1155 NFSLOCKNODE(np);
1156 np->n_size = np->n_vattr.na_size = tsize;
1157 vnode_pager_setsize(vp, tsize);
1158 NFSUNLOCKNODE(np);
1159 }
1160 }
1161 return (error);
1162 }
1163
1164 /*
1165 * Do an nfs setattr rpc.
1166 */
1167 static int
nfs_setattrrpc(struct vnode * vp,struct vattr * vap,struct ucred * cred,struct thread * td)1168 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
1169 struct thread *td)
1170 {
1171 struct nfsnode *np = VTONFS(vp);
1172 int error, ret, attrflag, i;
1173 struct nfsvattr nfsva;
1174
1175 if (NFS_ISV34(vp)) {
1176 NFSLOCKNODE(np);
1177 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
1178 np->n_accesscache[i].stamp = 0;
1179 np->n_flag |= NDELEGMOD;
1180 NFSUNLOCKNODE(np);
1181 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
1182 }
1183 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag);
1184 if (attrflag) {
1185 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
1186 if (ret && !error)
1187 error = ret;
1188 }
1189 if (error && NFS_ISV4(vp))
1190 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
1191 return (error);
1192 }
1193
1194 /*
1195 * nfs lookup call, one step at a time...
1196 * First look in cache
1197 * If not found, unlock the directory nfsnode and do the rpc
1198 */
1199 static int
nfs_lookup(struct vop_lookup_args * ap)1200 nfs_lookup(struct vop_lookup_args *ap)
1201 {
1202 struct componentname *cnp = ap->a_cnp;
1203 struct vnode *dvp = ap->a_dvp;
1204 struct vnode **vpp = ap->a_vpp;
1205 struct mount *mp = dvp->v_mount;
1206 int flags = cnp->cn_flags;
1207 struct vnode *newvp;
1208 struct nfsmount *nmp;
1209 struct nfsnode *np, *newnp;
1210 int error = 0, attrflag, dattrflag, ltype, ncticks;
1211 struct thread *td = curthread;
1212 struct nfsfh *nfhp;
1213 struct nfsvattr dnfsva, nfsva;
1214 struct vattr vattr;
1215 struct timespec nctime, ts;
1216 uint32_t openmode;
1217
1218 *vpp = NULLVP;
1219 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
1220 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
1221 return (EROFS);
1222 if (dvp->v_type != VDIR)
1223 return (ENOTDIR);
1224 nmp = VFSTONFS(mp);
1225 np = VTONFS(dvp);
1226
1227 /* For NFSv4, wait until any remove is done. */
1228 NFSLOCKNODE(np);
1229 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
1230 np->n_flag |= NREMOVEWANT;
1231 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
1232 }
1233 NFSUNLOCKNODE(np);
1234
1235 error = vn_dir_check_exec(dvp, cnp);
1236 if (error != 0)
1237 return (error);
1238 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks);
1239 if (error > 0 && error != ENOENT)
1240 return (error);
1241 if (error == -1) {
1242 /*
1243 * Lookups of "." are special and always return the
1244 * current directory. cache_lookup() already handles
1245 * associated locking bookkeeping, etc.
1246 */
1247 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
1248 return (0);
1249 }
1250
1251 /*
1252 * We only accept a positive hit in the cache if the
1253 * change time of the file matches our cached copy.
1254 * Otherwise, we discard the cache entry and fallback
1255 * to doing a lookup RPC. We also only trust cache
1256 * entries for less than nm_nametimeo seconds.
1257 *
1258 * To better handle stale file handles and attributes,
1259 * clear the attribute cache of this node if it is a
1260 * leaf component, part of an open() call, and not
1261 * locally modified before fetching the attributes.
1262 * This should allow stale file handles to be detected
1263 * here where we can fall back to a LOOKUP RPC to
1264 * recover rather than having nfs_open() detect the
1265 * stale file handle and failing open(2) with ESTALE.
1266 */
1267 newvp = *vpp;
1268 newnp = VTONFS(newvp);
1269 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
1270 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1271 !(newnp->n_flag & NMODIFIED)) {
1272 NFSLOCKNODE(newnp);
1273 newnp->n_attrstamp = 0;
1274 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1275 NFSUNLOCKNODE(newnp);
1276 }
1277 if (nfscl_nodeleg(newvp, 0) == 0 ||
1278 ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
1279 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
1280 timespeccmp(&vattr.va_ctime, &nctime, ==))) {
1281 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits);
1282 return (0);
1283 }
1284 cache_purge(newvp);
1285 if (dvp != newvp)
1286 vput(newvp);
1287 else
1288 vrele(newvp);
1289 *vpp = NULLVP;
1290 } else if (error == ENOENT) {
1291 if (VN_IS_DOOMED(dvp))
1292 return (ENOENT);
1293 /*
1294 * We only accept a negative hit in the cache if the
1295 * modification time of the parent directory matches
1296 * the cached copy in the name cache entry.
1297 * Otherwise, we discard all of the negative cache
1298 * entries for this directory. We also only trust
1299 * negative cache entries for up to nm_negnametimeo
1300 * seconds.
1301 */
1302 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
1303 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
1304 timespeccmp(&vattr.va_mtime, &nctime, ==)) {
1305 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits);
1306 return (ENOENT);
1307 }
1308 cache_purge_negative(dvp);
1309 }
1310
1311 openmode = 0;
1312 /*
1313 * If this an NFSv4.1/4.2 mount using the "oneopenown" mount
1314 * option, it is possible to do the Open operation in the same
1315 * compound as Lookup, so long as delegations are not being
1316 * issued. This saves doing a separate RPC for Open.
1317 * For pnfs, do not do this, since the Open+LayoutGet will
1318 * be needed as a separate RPC.
1319 */
1320 NFSLOCKMNT(nmp);
1321 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp) && !NFSHASPNFS(nmp) &&
1322 (nmp->nm_privflag & NFSMNTP_DELEGISSUED) == 0 &&
1323 (!NFSMNT_RDONLY(mp) || (flags & OPENWRITE) == 0) &&
1324 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN)) {
1325 if ((flags & OPENREAD) != 0)
1326 openmode |= NFSV4OPEN_ACCESSREAD;
1327 if ((flags & OPENWRITE) != 0)
1328 openmode |= NFSV4OPEN_ACCESSWRITE;
1329 }
1330 NFSUNLOCKMNT(nmp);
1331
1332 newvp = NULLVP;
1333 NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses);
1334 nanouptime(&ts);
1335 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1336 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1337 openmode);
1338 if (dattrflag)
1339 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
1340 if (error) {
1341 if (newvp != NULLVP) {
1342 vput(newvp);
1343 *vpp = NULLVP;
1344 }
1345
1346 if (error != ENOENT) {
1347 if (NFS_ISV4(dvp))
1348 error = nfscl_maperr(td, error, (uid_t)0,
1349 (gid_t)0);
1350 return (error);
1351 }
1352
1353 /* The requested file was not found. */
1354 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
1355 (flags & ISLASTCN)) {
1356 /*
1357 * XXX: UFS does a full VOP_ACCESS(dvp,
1358 * VWRITE) here instead of just checking
1359 * MNT_RDONLY.
1360 */
1361 if (mp->mnt_flag & MNT_RDONLY)
1362 return (EROFS);
1363 return (EJUSTRETURN);
1364 }
1365
1366 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) {
1367 /*
1368 * Cache the modification time of the parent
1369 * directory from the post-op attributes in
1370 * the name cache entry. The negative cache
1371 * entry will be ignored once the directory
1372 * has changed. Don't bother adding the entry
1373 * if the directory has already changed.
1374 */
1375 NFSLOCKNODE(np);
1376 if (timespeccmp(&np->n_vattr.na_mtime,
1377 &dnfsva.na_mtime, ==)) {
1378 NFSUNLOCKNODE(np);
1379 cache_enter_time(dvp, NULL, cnp,
1380 &dnfsva.na_mtime, NULL);
1381 } else
1382 NFSUNLOCKNODE(np);
1383 }
1384 return (ENOENT);
1385 }
1386
1387 /*
1388 * Handle RENAME case...
1389 */
1390 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
1391 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1392 free(nfhp, M_NFSFH);
1393 return (EISDIR);
1394 }
1395 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, LK_EXCLUSIVE);
1396 if (error)
1397 return (error);
1398 newvp = NFSTOV(np);
1399 /*
1400 * If n_localmodtime >= time before RPC, then
1401 * a file modification operation, such as
1402 * VOP_SETATTR() of size, has occurred while
1403 * the Lookup RPC and acquisition of the vnode
1404 * happened. As such, the attributes might
1405 * be stale, with possibly an incorrect size.
1406 */
1407 NFSLOCKNODE(np);
1408 if (timespecisset(&np->n_localmodtime) &&
1409 timespeccmp(&np->n_localmodtime, &ts, >=)) {
1410 NFSCL_DEBUG(4, "nfs_lookup: rename localmod "
1411 "stale attributes\n");
1412 attrflag = 0;
1413 }
1414 NFSUNLOCKNODE(np);
1415 if (attrflag)
1416 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
1417 *vpp = newvp;
1418 return (0);
1419 }
1420
1421 if (flags & ISDOTDOT) {
1422 ltype = NFSVOPISLOCKED(dvp);
1423 error = vfs_busy(mp, MBF_NOWAIT);
1424 if (error != 0) {
1425 vfs_ref(mp);
1426 NFSVOPUNLOCK(dvp);
1427 error = vfs_busy(mp, 0);
1428 NFSVOPLOCK(dvp, ltype | LK_RETRY);
1429 vfs_rel(mp);
1430 if (error == 0 && VN_IS_DOOMED(dvp)) {
1431 vfs_unbusy(mp);
1432 error = ENOENT;
1433 }
1434 if (error != 0)
1435 return (error);
1436 }
1437 NFSVOPUNLOCK(dvp);
1438 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np,
1439 cnp->cn_lkflags);
1440 if (error == 0)
1441 newvp = NFSTOV(np);
1442 vfs_unbusy(mp);
1443 if (newvp != dvp)
1444 NFSVOPLOCK(dvp, ltype | LK_RETRY);
1445 if (VN_IS_DOOMED(dvp)) {
1446 if (error == 0) {
1447 if (newvp == dvp)
1448 vrele(newvp);
1449 else
1450 vput(newvp);
1451 }
1452 error = ENOENT;
1453 }
1454 if (error != 0)
1455 return (error);
1456 if (attrflag)
1457 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
1458 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1459 free(nfhp, M_NFSFH);
1460 VREF(dvp);
1461 newvp = dvp;
1462 if (attrflag)
1463 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
1464 } else {
1465 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np,
1466 cnp->cn_lkflags);
1467 if (error)
1468 return (error);
1469 newvp = NFSTOV(np);
1470 /*
1471 * If n_localmodtime >= time before RPC, then
1472 * a file modification operation, such as
1473 * VOP_SETATTR() of size, has occurred while
1474 * the Lookup RPC and acquisition of the vnode
1475 * happened. As such, the attributes might
1476 * be stale, with possibly an incorrect size.
1477 */
1478 NFSLOCKNODE(np);
1479 if (timespecisset(&np->n_localmodtime) &&
1480 timespeccmp(&np->n_localmodtime, &ts, >=)) {
1481 NFSCL_DEBUG(4, "nfs_lookup: localmod "
1482 "stale attributes\n");
1483 attrflag = 0;
1484 }
1485 NFSUNLOCKNODE(np);
1486 if (attrflag)
1487 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
1488 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1489 !(np->n_flag & NMODIFIED)) {
1490 /*
1491 * Flush the attribute cache when opening a
1492 * leaf node to ensure that fresh attributes
1493 * are fetched in nfs_open() since we did not
1494 * fetch attributes from the LOOKUP reply.
1495 */
1496 NFSLOCKNODE(np);
1497 np->n_attrstamp = 0;
1498 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1499 NFSUNLOCKNODE(np);
1500 }
1501 }
1502 if ((cnp->cn_flags & MAKEENTRY) && dvp != newvp &&
1503 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
1504 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
1505 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
1506 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime);
1507 *vpp = newvp;
1508 return (0);
1509 }
1510
1511 /*
1512 * nfs read call.
1513 * Just call ncl_bioread() to do the work.
1514 */
1515 static int
nfs_read(struct vop_read_args * ap)1516 nfs_read(struct vop_read_args *ap)
1517 {
1518 struct vnode *vp = ap->a_vp;
1519
1520 switch (vp->v_type) {
1521 case VREG:
1522 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
1523 case VDIR:
1524 return (EISDIR);
1525 default:
1526 return (EOPNOTSUPP);
1527 }
1528 }
1529
1530 /*
1531 * nfs readlink call
1532 */
1533 static int
nfs_readlink(struct vop_readlink_args * ap)1534 nfs_readlink(struct vop_readlink_args *ap)
1535 {
1536 struct vnode *vp = ap->a_vp;
1537
1538 if (vp->v_type != VLNK)
1539 return (EINVAL);
1540 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
1541 }
1542
1543 /*
1544 * Do a readlink rpc.
1545 * Called by ncl_doio() from below the buffer cache.
1546 */
1547 int
ncl_readlinkrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred)1548 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1549 {
1550 int error, ret, attrflag;
1551 struct nfsvattr nfsva;
1552
1553 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
1554 &attrflag);
1555 if (attrflag) {
1556 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
1557 if (ret && !error)
1558 error = ret;
1559 }
1560 if (error && NFS_ISV4(vp))
1561 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1562 return (error);
1563 }
1564
1565 /*
1566 * nfs read rpc call
1567 * Ditto above
1568 */
1569 int
ncl_readrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred)1570 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1571 {
1572 int error, ret, attrflag;
1573 struct nfsvattr nfsva;
1574 struct nfsmount *nmp;
1575
1576 nmp = VFSTONFS(vp->v_mount);
1577 error = EIO;
1578 attrflag = 0;
1579 if (NFSHASPNFS(nmp))
1580 error = nfscl_doiods(vp, uiop, NULL, NULL,
1581 NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td);
1582 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error);
1583 if (error != 0 && error != EFAULT)
1584 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva,
1585 &attrflag);
1586 if (attrflag) {
1587 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
1588 if (ret && !error)
1589 error = ret;
1590 }
1591 if (error && NFS_ISV4(vp))
1592 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1593 return (error);
1594 }
1595
1596 /*
1597 * nfs write call
1598 */
1599 int
ncl_writerpc(struct vnode * vp,struct uio * uiop,struct ucred * cred,int * iomode,int * must_commit,int called_from_strategy,int ioflag)1600 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
1601 int *iomode, int *must_commit, int called_from_strategy, int ioflag)
1602 {
1603 struct nfsvattr nfsva;
1604 int error, attrflag, ret;
1605 struct nfsmount *nmp;
1606
1607 nmp = VFSTONFS(vp->v_mount);
1608 error = EIO;
1609 attrflag = 0;
1610 if (NFSHASPNFS(nmp))
1611 error = nfscl_doiods(vp, uiop, iomode, must_commit,
1612 NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td);
1613 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error);
1614 if (error != 0 && error != EFAULT)
1615 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
1616 uiop->uio_td, &nfsva, &attrflag, called_from_strategy,
1617 ioflag);
1618 if (attrflag) {
1619 if (VTONFS(vp)->n_flag & ND_NFSV4)
1620 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 1, 1);
1621 else
1622 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
1623 if (ret && !error)
1624 error = ret;
1625 }
1626 if (DOINGASYNC(vp))
1627 *iomode = NFSWRITE_FILESYNC;
1628 if (error && NFS_ISV4(vp))
1629 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1630 return (error);
1631 }
1632
1633 /*
1634 * nfs mknod rpc
1635 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
1636 * mode set to specify the file type and the size field for rdev.
1637 */
1638 static int
nfs_mknodrpc(struct vnode * dvp,struct vnode ** vpp,struct componentname * cnp,struct vattr * vap)1639 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
1640 struct vattr *vap)
1641 {
1642 struct nfsvattr nfsva, dnfsva;
1643 struct vnode *newvp = NULL;
1644 struct nfsnode *np = NULL, *dnp;
1645 struct nfsfh *nfhp;
1646 struct vattr vattr;
1647 int error = 0, attrflag, dattrflag;
1648 u_int32_t rdev;
1649
1650 if (vap->va_type == VCHR || vap->va_type == VBLK)
1651 rdev = vap->va_rdev;
1652 else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
1653 rdev = 0xffffffff;
1654 else
1655 return (EOPNOTSUPP);
1656 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1657 return (error);
1658 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
1659 rdev, vap->va_type, cnp->cn_cred, curthread, &dnfsva,
1660 &nfsva, &nfhp, &attrflag, &dattrflag);
1661 if (!error) {
1662 if (!nfhp)
1663 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1664 cnp->cn_namelen, cnp->cn_cred, curthread,
1665 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 0);
1666 if (nfhp)
1667 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1668 curthread, &np, LK_EXCLUSIVE);
1669 }
1670 if (dattrflag)
1671 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
1672 if (!error) {
1673 newvp = NFSTOV(np);
1674 if (attrflag != 0) {
1675 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
1676 if (error != 0)
1677 vput(newvp);
1678 }
1679 }
1680 if (!error) {
1681 *vpp = newvp;
1682 } else if (NFS_ISV4(dvp)) {
1683 error = nfscl_maperr(curthread, error, vap->va_uid,
1684 vap->va_gid);
1685 }
1686 dnp = VTONFS(dvp);
1687 NFSLOCKNODE(dnp);
1688 dnp->n_flag |= NMODIFIED;
1689 if (!dattrflag) {
1690 dnp->n_attrstamp = 0;
1691 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1692 }
1693 NFSUNLOCKNODE(dnp);
1694 return (error);
1695 }
1696
1697 /*
1698 * nfs mknod vop
1699 * just call nfs_mknodrpc() to do the work.
1700 */
1701 /* ARGSUSED */
1702 static int
nfs_mknod(struct vop_mknod_args * ap)1703 nfs_mknod(struct vop_mknod_args *ap)
1704 {
1705 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
1706 }
1707
1708 static struct mtx nfs_cverf_mtx;
1709 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex",
1710 MTX_DEF);
1711
1712 static nfsquad_t
nfs_get_cverf(void)1713 nfs_get_cverf(void)
1714 {
1715 static nfsquad_t cverf;
1716 nfsquad_t ret;
1717 static int cverf_initialized = 0;
1718
1719 mtx_lock(&nfs_cverf_mtx);
1720 if (cverf_initialized == 0) {
1721 cverf.lval[0] = arc4random();
1722 cverf.lval[1] = arc4random();
1723 cverf_initialized = 1;
1724 } else
1725 cverf.qval++;
1726 ret = cverf;
1727 mtx_unlock(&nfs_cverf_mtx);
1728
1729 return (ret);
1730 }
1731
1732 /*
1733 * nfs file create call
1734 */
1735 static int
nfs_create(struct vop_create_args * ap)1736 nfs_create(struct vop_create_args *ap)
1737 {
1738 struct vnode *dvp = ap->a_dvp;
1739 struct vattr *vap = ap->a_vap;
1740 struct componentname *cnp = ap->a_cnp;
1741 struct nfsnode *np = NULL, *dnp;
1742 struct vnode *newvp = NULL;
1743 struct nfsmount *nmp;
1744 struct nfsvattr dnfsva, nfsva;
1745 struct nfsfh *nfhp;
1746 nfsquad_t cverf;
1747 int error = 0, attrflag, dattrflag, fmode = 0;
1748 struct vattr vattr;
1749
1750 /*
1751 * Oops, not for me..
1752 */
1753 if (vap->va_type == VSOCK)
1754 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
1755
1756 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1757 return (error);
1758 if (vap->va_vaflags & VA_EXCLUSIVE)
1759 fmode |= O_EXCL;
1760 dnp = VTONFS(dvp);
1761 nmp = VFSTONFS(dvp->v_mount);
1762 again:
1763 /* For NFSv4, wait until any remove is done. */
1764 NFSLOCKNODE(dnp);
1765 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
1766 dnp->n_flag |= NREMOVEWANT;
1767 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
1768 }
1769 NFSUNLOCKNODE(dnp);
1770
1771 cverf = nfs_get_cverf();
1772 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1773 vap, cverf, fmode, cnp->cn_cred, curthread, &dnfsva, &nfsva,
1774 &nfhp, &attrflag, &dattrflag);
1775 if (!error) {
1776 if (nfhp == NULL)
1777 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1778 cnp->cn_namelen, cnp->cn_cred, curthread,
1779 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 0);
1780 if (nfhp != NULL)
1781 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1782 curthread, &np, LK_EXCLUSIVE);
1783 }
1784 if (dattrflag)
1785 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
1786 if (!error) {
1787 newvp = NFSTOV(np);
1788 if (attrflag == 0)
1789 error = nfsrpc_getattr(newvp, cnp->cn_cred, curthread,
1790 &nfsva);
1791 if (error == 0)
1792 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
1793 }
1794 if (error) {
1795 if (newvp != NULL) {
1796 vput(newvp);
1797 newvp = NULL;
1798 }
1799 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
1800 error == NFSERR_NOTSUPP) {
1801 fmode &= ~O_EXCL;
1802 goto again;
1803 }
1804 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
1805 if (nfscl_checksattr(vap, &nfsva)) {
1806 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
1807 curthread, &nfsva, &attrflag);
1808 if (error && (vap->va_uid != (uid_t)VNOVAL ||
1809 vap->va_gid != (gid_t)VNOVAL)) {
1810 /* try again without setting uid/gid */
1811 vap->va_uid = (uid_t)VNOVAL;
1812 vap->va_gid = (uid_t)VNOVAL;
1813 error = nfsrpc_setattr(newvp, vap, NULL,
1814 cnp->cn_cred, curthread, &nfsva, &attrflag);
1815 }
1816 if (attrflag)
1817 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
1818 0, 1);
1819 if (error != 0)
1820 vput(newvp);
1821 }
1822 }
1823 if (!error) {
1824 if ((cnp->cn_flags & MAKEENTRY) && attrflag) {
1825 if (dvp != newvp)
1826 cache_enter_time(dvp, newvp, cnp,
1827 &nfsva.na_ctime, NULL);
1828 else
1829 printf("nfs_create: bogus NFS server returned "
1830 "the directory as the new file object\n");
1831 }
1832 *ap->a_vpp = newvp;
1833 } else if (NFS_ISV4(dvp)) {
1834 error = nfscl_maperr(curthread, error, vap->va_uid,
1835 vap->va_gid);
1836 }
1837 NFSLOCKNODE(dnp);
1838 dnp->n_flag |= NMODIFIED;
1839 if (!dattrflag) {
1840 dnp->n_attrstamp = 0;
1841 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1842 }
1843 NFSUNLOCKNODE(dnp);
1844 return (error);
1845 }
1846
1847 /*
1848 * nfs file remove call
1849 * To try and make nfs semantics closer to ufs semantics, a file that has
1850 * other processes using the vnode is renamed instead of removed and then
1851 * removed later on the last close.
1852 * - If v_usecount > 1
1853 * If a rename is not already in the works
1854 * call nfs_sillyrename() to set it up
1855 * else
1856 * do the remove rpc
1857 */
1858 static int
nfs_remove(struct vop_remove_args * ap)1859 nfs_remove(struct vop_remove_args *ap)
1860 {
1861 struct vnode *vp = ap->a_vp;
1862 struct vnode *dvp = ap->a_dvp;
1863 struct componentname *cnp = ap->a_cnp;
1864 struct nfsnode *np = VTONFS(vp);
1865 int error = 0;
1866 struct vattr vattr;
1867
1868 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
1869 if (vp->v_type == VDIR)
1870 error = EPERM;
1871 else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
1872 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
1873 vattr.va_nlink > 1)) {
1874 /*
1875 * Purge the name cache so that the chance of a lookup for
1876 * the name succeeding while the remove is in progress is
1877 * minimized. Without node locking it can still happen, such
1878 * that an I/O op returns ESTALE, but since you get this if
1879 * another host removes the file..
1880 */
1881 cache_purge(vp);
1882 /*
1883 * throw away biocache buffers, mainly to avoid
1884 * unnecessary delayed writes later.
1885 */
1886 error = ncl_vinvalbuf(vp, 0, curthread, 1);
1887 if (error != EINTR && error != EIO)
1888 /* Do the rpc */
1889 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
1890 cnp->cn_namelen, cnp->cn_cred, curthread);
1891 /*
1892 * Kludge City: If the first reply to the remove rpc is lost..
1893 * the reply to the retransmitted request will be ENOENT
1894 * since the file was in fact removed
1895 * Therefore, we cheat and return success.
1896 */
1897 if (error == ENOENT)
1898 error = 0;
1899 } else if (!np->n_sillyrename)
1900 error = nfs_sillyrename(dvp, vp, cnp);
1901 NFSLOCKNODE(np);
1902 np->n_attrstamp = 0;
1903 NFSUNLOCKNODE(np);
1904 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1905 return (error);
1906 }
1907
1908 /*
1909 * nfs file remove rpc called from nfs_inactive
1910 */
1911 int
ncl_removeit(struct sillyrename * sp,struct vnode * vp)1912 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
1913 {
1914 /*
1915 * Make sure that the directory vnode is still valid.
1916 * XXX we should lock sp->s_dvp here.
1917 */
1918 if (sp->s_dvp->v_type == VBAD)
1919 return (0);
1920 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
1921 sp->s_cred, NULL));
1922 }
1923
1924 /*
1925 * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
1926 */
1927 static int
nfs_removerpc(struct vnode * dvp,struct vnode * vp,char * name,int namelen,struct ucred * cred,struct thread * td)1928 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
1929 int namelen, struct ucred *cred, struct thread *td)
1930 {
1931 struct nfsvattr dnfsva;
1932 struct nfsnode *dnp = VTONFS(dvp);
1933 int error = 0, dattrflag;
1934
1935 NFSLOCKNODE(dnp);
1936 dnp->n_flag |= NREMOVEINPROG;
1937 NFSUNLOCKNODE(dnp);
1938 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
1939 &dattrflag);
1940 NFSLOCKNODE(dnp);
1941 if ((dnp->n_flag & NREMOVEWANT)) {
1942 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
1943 NFSUNLOCKNODE(dnp);
1944 wakeup((caddr_t)dnp);
1945 } else {
1946 dnp->n_flag &= ~NREMOVEINPROG;
1947 NFSUNLOCKNODE(dnp);
1948 }
1949 if (dattrflag)
1950 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
1951 NFSLOCKNODE(dnp);
1952 dnp->n_flag |= NMODIFIED;
1953 if (!dattrflag) {
1954 dnp->n_attrstamp = 0;
1955 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1956 }
1957 NFSUNLOCKNODE(dnp);
1958 if (error && NFS_ISV4(dvp))
1959 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1960 return (error);
1961 }
1962
1963 /*
1964 * nfs file rename call
1965 */
1966 static int
nfs_rename(struct vop_rename_args * ap)1967 nfs_rename(struct vop_rename_args *ap)
1968 {
1969 struct vnode *fvp = ap->a_fvp;
1970 struct vnode *tvp = ap->a_tvp;
1971 struct vnode *fdvp = ap->a_fdvp;
1972 struct vnode *tdvp = ap->a_tdvp;
1973 struct componentname *tcnp = ap->a_tcnp;
1974 struct componentname *fcnp = ap->a_fcnp;
1975 struct nfsnode *fnp = VTONFS(ap->a_fvp);
1976 struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
1977 struct nfsv4node *newv4 = NULL;
1978 int error;
1979
1980 /* Check for cross-device rename */
1981 if ((fvp->v_mount != tdvp->v_mount) ||
1982 (tvp && (fvp->v_mount != tvp->v_mount))) {
1983 error = EXDEV;
1984 goto out;
1985 }
1986
1987 if (fvp == tvp) {
1988 printf("nfs_rename: fvp == tvp (can't happen)\n");
1989 error = 0;
1990 goto out;
1991 }
1992 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
1993 goto out;
1994
1995 /*
1996 * We have to flush B_DELWRI data prior to renaming
1997 * the file. If we don't, the delayed-write buffers
1998 * can be flushed out later after the file has gone stale
1999 * under NFSV3. NFSV2 does not have this problem because
2000 * ( as far as I can tell ) it flushes dirty buffers more
2001 * often.
2002 *
2003 * Skip the rename operation if the fsync fails, this can happen
2004 * due to the server's volume being full, when we pushed out data
2005 * that was written back to our cache earlier. Not checking for
2006 * this condition can result in potential (silent) data loss.
2007 */
2008 error = VOP_FSYNC(fvp, MNT_WAIT, curthread);
2009 NFSVOPUNLOCK(fvp);
2010 if (!error && tvp)
2011 error = VOP_FSYNC(tvp, MNT_WAIT, curthread);
2012 if (error)
2013 goto out;
2014
2015 /*
2016 * If the tvp exists and is in use, sillyrename it before doing the
2017 * rename of the new file over it.
2018 * XXX Can't sillyrename a directory.
2019 */
2020 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
2021 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
2022 vput(tvp);
2023 tvp = NULL;
2024 }
2025
2026 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
2027 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
2028 curthread);
2029
2030 if (error == 0 && NFS_ISV4(tdvp)) {
2031 /*
2032 * For NFSv4, check to see if it is the same name and
2033 * replace the name, if it is different.
2034 */
2035 newv4 = malloc(
2036 sizeof (struct nfsv4node) +
2037 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
2038 M_NFSV4NODE, M_WAITOK);
2039 NFSLOCKNODE(tdnp);
2040 NFSLOCKNODE(fnp);
2041 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
2042 (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
2043 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
2044 tcnp->cn_namelen) ||
2045 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
2046 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
2047 tdnp->n_fhp->nfh_len))) {
2048 free(fnp->n_v4, M_NFSV4NODE);
2049 fnp->n_v4 = newv4;
2050 newv4 = NULL;
2051 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
2052 fnp->n_v4->n4_namelen = tcnp->cn_namelen;
2053 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
2054 tdnp->n_fhp->nfh_len);
2055 NFSBCOPY(tcnp->cn_nameptr,
2056 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
2057 }
2058 NFSUNLOCKNODE(tdnp);
2059 NFSUNLOCKNODE(fnp);
2060 if (newv4 != NULL)
2061 free(newv4, M_NFSV4NODE);
2062 }
2063
2064 if (fvp->v_type == VDIR) {
2065 if (tvp != NULL && tvp->v_type == VDIR)
2066 cache_purge(tdvp);
2067 cache_purge(fdvp);
2068 }
2069
2070 out:
2071 if (tdvp == tvp)
2072 vrele(tdvp);
2073 else
2074 vput(tdvp);
2075 if (tvp)
2076 vput(tvp);
2077 vrele(fdvp);
2078 vrele(fvp);
2079 /*
2080 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
2081 */
2082 if (error == ENOENT)
2083 error = 0;
2084 return (error);
2085 }
2086
2087 /*
2088 * nfs file rename rpc called from nfs_remove() above
2089 */
2090 static int
nfs_renameit(struct vnode * sdvp,struct vnode * svp,struct componentname * scnp,struct sillyrename * sp)2091 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
2092 struct sillyrename *sp)
2093 {
2094
2095 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
2096 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
2097 curthread));
2098 }
2099
2100 /*
2101 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
2102 */
2103 static int
nfs_renamerpc(struct vnode * fdvp,struct vnode * fvp,char * fnameptr,int fnamelen,struct vnode * tdvp,struct vnode * tvp,char * tnameptr,int tnamelen,struct ucred * cred,struct thread * td)2104 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
2105 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
2106 int tnamelen, struct ucred *cred, struct thread *td)
2107 {
2108 struct nfsvattr fnfsva, tnfsva;
2109 struct nfsnode *fdnp = VTONFS(fdvp);
2110 struct nfsnode *tdnp = VTONFS(tdvp);
2111 int error = 0, fattrflag, tattrflag;
2112
2113 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
2114 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
2115 &tattrflag);
2116 NFSLOCKNODE(fdnp);
2117 fdnp->n_flag |= NMODIFIED;
2118 if (fattrflag != 0) {
2119 NFSUNLOCKNODE(fdnp);
2120 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, 0, 1);
2121 } else {
2122 fdnp->n_attrstamp = 0;
2123 NFSUNLOCKNODE(fdnp);
2124 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
2125 }
2126 NFSLOCKNODE(tdnp);
2127 tdnp->n_flag |= NMODIFIED;
2128 if (tattrflag != 0) {
2129 NFSUNLOCKNODE(tdnp);
2130 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, 0, 1);
2131 } else {
2132 tdnp->n_attrstamp = 0;
2133 NFSUNLOCKNODE(tdnp);
2134 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
2135 }
2136 if (error && NFS_ISV4(fdvp))
2137 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2138 return (error);
2139 }
2140
2141 /*
2142 * nfs hard link create call
2143 */
2144 static int
nfs_link(struct vop_link_args * ap)2145 nfs_link(struct vop_link_args *ap)
2146 {
2147 struct vnode *vp = ap->a_vp;
2148 struct vnode *tdvp = ap->a_tdvp;
2149 struct componentname *cnp = ap->a_cnp;
2150 struct nfsnode *np, *tdnp;
2151 struct nfsvattr nfsva, dnfsva;
2152 int error = 0, attrflag, dattrflag;
2153
2154 /*
2155 * Push all writes to the server, so that the attribute cache
2156 * doesn't get "out of sync" with the server.
2157 * XXX There should be a better way!
2158 */
2159 VOP_FSYNC(vp, MNT_WAIT, curthread);
2160
2161 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
2162 cnp->cn_cred, curthread, &dnfsva, &nfsva, &attrflag, &dattrflag);
2163 tdnp = VTONFS(tdvp);
2164 NFSLOCKNODE(tdnp);
2165 tdnp->n_flag |= NMODIFIED;
2166 if (dattrflag != 0) {
2167 NFSUNLOCKNODE(tdnp);
2168 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, 0, 1);
2169 } else {
2170 tdnp->n_attrstamp = 0;
2171 NFSUNLOCKNODE(tdnp);
2172 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
2173 }
2174 if (attrflag)
2175 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
2176 else {
2177 np = VTONFS(vp);
2178 NFSLOCKNODE(np);
2179 np->n_attrstamp = 0;
2180 NFSUNLOCKNODE(np);
2181 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
2182 }
2183 /*
2184 * If negative lookup caching is enabled, I might as well
2185 * add an entry for this node. Not necessary for correctness,
2186 * but if negative caching is enabled, then the system
2187 * must care about lookup caching hit rate, so...
2188 */
2189 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
2190 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2191 if (tdvp != vp)
2192 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL);
2193 else
2194 printf("nfs_link: bogus NFS server returned "
2195 "the directory as the new link\n");
2196 }
2197 if (error && NFS_ISV4(vp))
2198 error = nfscl_maperr(curthread, error, (uid_t)0,
2199 (gid_t)0);
2200 return (error);
2201 }
2202
2203 /*
2204 * nfs symbolic link create call
2205 */
2206 static int
nfs_symlink(struct vop_symlink_args * ap)2207 nfs_symlink(struct vop_symlink_args *ap)
2208 {
2209 struct vnode *dvp = ap->a_dvp;
2210 struct vattr *vap = ap->a_vap;
2211 struct componentname *cnp = ap->a_cnp;
2212 struct nfsvattr nfsva, dnfsva;
2213 struct nfsfh *nfhp;
2214 struct nfsnode *np = NULL, *dnp;
2215 struct vnode *newvp = NULL;
2216 int error = 0, attrflag, dattrflag, ret;
2217
2218 vap->va_type = VLNK;
2219 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2220 ap->a_target, vap, cnp->cn_cred, curthread, &dnfsva,
2221 &nfsva, &nfhp, &attrflag, &dattrflag);
2222 if (nfhp) {
2223 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread,
2224 &np, LK_EXCLUSIVE);
2225 if (!ret)
2226 newvp = NFSTOV(np);
2227 else if (!error)
2228 error = ret;
2229 }
2230 if (newvp != NULL) {
2231 if (attrflag)
2232 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
2233 } else if (!error) {
2234 /*
2235 * If we do not have an error and we could not extract the
2236 * newvp from the response due to the request being NFSv2, we
2237 * have to do a lookup in order to obtain a newvp to return.
2238 */
2239 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2240 cnp->cn_cred, curthread, &np);
2241 if (!error)
2242 newvp = NFSTOV(np);
2243 }
2244 if (error) {
2245 if (newvp)
2246 vput(newvp);
2247 if (NFS_ISV4(dvp))
2248 error = nfscl_maperr(curthread, error,
2249 vap->va_uid, vap->va_gid);
2250 } else {
2251 *ap->a_vpp = newvp;
2252 }
2253
2254 dnp = VTONFS(dvp);
2255 NFSLOCKNODE(dnp);
2256 dnp->n_flag |= NMODIFIED;
2257 if (dattrflag != 0) {
2258 NFSUNLOCKNODE(dnp);
2259 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
2260 } else {
2261 dnp->n_attrstamp = 0;
2262 NFSUNLOCKNODE(dnp);
2263 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2264 }
2265 /*
2266 * If negative lookup caching is enabled, I might as well
2267 * add an entry for this node. Not necessary for correctness,
2268 * but if negative caching is enabled, then the system
2269 * must care about lookup caching hit rate, so...
2270 */
2271 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2272 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2273 if (dvp != newvp)
2274 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
2275 NULL);
2276 else
2277 printf("nfs_symlink: bogus NFS server returned "
2278 "the directory as the new file object\n");
2279 }
2280 return (error);
2281 }
2282
2283 /*
2284 * nfs make dir call
2285 */
2286 static int
nfs_mkdir(struct vop_mkdir_args * ap)2287 nfs_mkdir(struct vop_mkdir_args *ap)
2288 {
2289 struct vnode *dvp = ap->a_dvp;
2290 struct vattr *vap = ap->a_vap;
2291 struct componentname *cnp = ap->a_cnp;
2292 struct nfsnode *np = NULL, *dnp;
2293 struct vnode *newvp = NULL;
2294 struct vattr vattr;
2295 struct nfsfh *nfhp;
2296 struct nfsvattr nfsva, dnfsva;
2297 int error = 0, attrflag, dattrflag, ret;
2298
2299 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
2300 return (error);
2301 vap->va_type = VDIR;
2302 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2303 vap, cnp->cn_cred, curthread, &dnfsva, &nfsva, &nfhp,
2304 &attrflag, &dattrflag);
2305 dnp = VTONFS(dvp);
2306 NFSLOCKNODE(dnp);
2307 dnp->n_flag |= NMODIFIED;
2308 if (dattrflag != 0) {
2309 NFSUNLOCKNODE(dnp);
2310 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
2311 } else {
2312 dnp->n_attrstamp = 0;
2313 NFSUNLOCKNODE(dnp);
2314 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2315 }
2316 if (nfhp) {
2317 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread,
2318 &np, LK_EXCLUSIVE);
2319 if (!ret) {
2320 newvp = NFSTOV(np);
2321 if (attrflag)
2322 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
2323 0, 1);
2324 } else if (!error)
2325 error = ret;
2326 }
2327 if (!error && newvp == NULL) {
2328 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2329 cnp->cn_cred, curthread, &np);
2330 if (!error) {
2331 newvp = NFSTOV(np);
2332 if (newvp->v_type != VDIR)
2333 error = EEXIST;
2334 }
2335 }
2336 if (error) {
2337 if (newvp)
2338 vput(newvp);
2339 if (NFS_ISV4(dvp))
2340 error = nfscl_maperr(curthread, error,
2341 vap->va_uid, vap->va_gid);
2342 } else {
2343 /*
2344 * If negative lookup caching is enabled, I might as well
2345 * add an entry for this node. Not necessary for correctness,
2346 * but if negative caching is enabled, then the system
2347 * must care about lookup caching hit rate, so...
2348 */
2349 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2350 (cnp->cn_flags & MAKEENTRY) &&
2351 attrflag != 0 && dattrflag != 0) {
2352 if (dvp != newvp)
2353 cache_enter_time(dvp, newvp, cnp,
2354 &nfsva.na_ctime, &dnfsva.na_ctime);
2355 else
2356 printf("nfs_mkdir: bogus NFS server returned "
2357 "the directory that the directory was "
2358 "created in as the new file object\n");
2359 }
2360 *ap->a_vpp = newvp;
2361 }
2362 return (error);
2363 }
2364
2365 /*
2366 * nfs remove directory call
2367 */
2368 static int
nfs_rmdir(struct vop_rmdir_args * ap)2369 nfs_rmdir(struct vop_rmdir_args *ap)
2370 {
2371 struct vnode *vp = ap->a_vp;
2372 struct vnode *dvp = ap->a_dvp;
2373 struct componentname *cnp = ap->a_cnp;
2374 struct nfsnode *dnp;
2375 struct nfsvattr dnfsva;
2376 int error, dattrflag;
2377
2378 if (dvp == vp)
2379 return (EINVAL);
2380 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2381 cnp->cn_cred, curthread, &dnfsva, &dattrflag);
2382 dnp = VTONFS(dvp);
2383 NFSLOCKNODE(dnp);
2384 dnp->n_flag |= NMODIFIED;
2385 if (dattrflag != 0) {
2386 NFSUNLOCKNODE(dnp);
2387 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
2388 } else {
2389 dnp->n_attrstamp = 0;
2390 NFSUNLOCKNODE(dnp);
2391 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2392 }
2393
2394 cache_purge(dvp);
2395 cache_purge(vp);
2396 if (error && NFS_ISV4(dvp))
2397 error = nfscl_maperr(curthread, error, (uid_t)0,
2398 (gid_t)0);
2399 /*
2400 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
2401 */
2402 if (error == ENOENT)
2403 error = 0;
2404 return (error);
2405 }
2406
2407 /*
2408 * nfs readdir call
2409 */
2410 static int
nfs_readdir(struct vop_readdir_args * ap)2411 nfs_readdir(struct vop_readdir_args *ap)
2412 {
2413 struct vnode *vp = ap->a_vp;
2414 struct nfsnode *np = VTONFS(vp);
2415 struct uio *uio = ap->a_uio;
2416 ssize_t tresid, left;
2417 int error = 0;
2418 struct vattr vattr;
2419
2420 if (ap->a_eofflag != NULL)
2421 *ap->a_eofflag = 0;
2422 if (vp->v_type != VDIR)
2423 return(EPERM);
2424
2425 /*
2426 * First, check for hit on the EOF offset cache
2427 */
2428 NFSLOCKNODE(np);
2429 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
2430 (np->n_flag & NMODIFIED) == 0) {
2431 NFSUNLOCKNODE(np);
2432 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
2433 NFSLOCKNODE(np);
2434 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
2435 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
2436 NFSUNLOCKNODE(np);
2437 NFSINCRGLOBAL(nfsstatsv1.direofcache_hits);
2438 if (ap->a_eofflag != NULL)
2439 *ap->a_eofflag = 1;
2440 return (0);
2441 } else
2442 NFSUNLOCKNODE(np);
2443 }
2444 } else
2445 NFSUNLOCKNODE(np);
2446
2447 /*
2448 * NFS always guarantees that directory entries don't straddle
2449 * DIRBLKSIZ boundaries. As such, we need to limit the size
2450 * to an exact multiple of DIRBLKSIZ, to avoid copying a partial
2451 * directory entry.
2452 */
2453 left = uio->uio_resid % DIRBLKSIZ;
2454 if (left == uio->uio_resid)
2455 return (EINVAL);
2456 uio->uio_resid -= left;
2457
2458 /*
2459 * For readdirplus, if starting to read the directory,
2460 * purge the name cache, since it will be reloaded by
2461 * this directory read.
2462 * This removes potentially stale name cache entries.
2463 */
2464 if (uio->uio_offset == 0 &&
2465 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_RDIRPLUS) != 0)
2466 cache_purge(vp);
2467
2468 /*
2469 * Call ncl_bioread() to do the real work.
2470 */
2471 tresid = uio->uio_resid;
2472 error = ncl_bioread(vp, uio, 0, ap->a_cred);
2473
2474 if (!error && uio->uio_resid == tresid) {
2475 NFSINCRGLOBAL(nfsstatsv1.direofcache_misses);
2476 if (ap->a_eofflag != NULL)
2477 *ap->a_eofflag = 1;
2478 }
2479
2480 /* Add the partial DIRBLKSIZ (left) back in. */
2481 uio->uio_resid += left;
2482 return (error);
2483 }
2484
2485 /*
2486 * Readdir rpc call.
2487 * Called from below the buffer cache by ncl_doio().
2488 */
2489 int
ncl_readdirrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred,struct thread * td)2490 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2491 struct thread *td)
2492 {
2493 struct nfsvattr nfsva;
2494 nfsuint64 *cookiep, cookie;
2495 struct nfsnode *dnp = VTONFS(vp);
2496 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2497 int error = 0, eof, attrflag;
2498
2499 KASSERT(uiop->uio_iovcnt == 1 &&
2500 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2501 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2502 ("nfs readdirrpc bad uio"));
2503
2504 /*
2505 * If there is no cookie, assume directory was stale.
2506 */
2507 ncl_dircookie_lock(dnp);
2508 NFSUNLOCKNODE(dnp);
2509 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2510 if (cookiep) {
2511 cookie = *cookiep;
2512 ncl_dircookie_unlock(dnp);
2513 } else {
2514 ncl_dircookie_unlock(dnp);
2515 return (NFSERR_BAD_COOKIE);
2516 }
2517
2518 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2519 (void)ncl_fsinfo(nmp, vp, cred, td);
2520
2521 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
2522 &attrflag, &eof);
2523 if (attrflag)
2524 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
2525
2526 if (!error) {
2527 /*
2528 * We are now either at the end of the directory or have filled
2529 * the block.
2530 */
2531 if (eof) {
2532 NFSLOCKNODE(dnp);
2533 dnp->n_direofoffset = uiop->uio_offset;
2534 NFSUNLOCKNODE(dnp);
2535 } else {
2536 if (uiop->uio_resid > 0)
2537 printf("EEK! readdirrpc resid > 0\n");
2538 ncl_dircookie_lock(dnp);
2539 NFSUNLOCKNODE(dnp);
2540 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2541 *cookiep = cookie;
2542 ncl_dircookie_unlock(dnp);
2543 }
2544 } else if (NFS_ISV4(vp)) {
2545 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2546 }
2547 return (error);
2548 }
2549
2550 /*
2551 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
2552 */
2553 int
ncl_readdirplusrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred,struct thread * td)2554 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2555 struct thread *td)
2556 {
2557 struct nfsvattr nfsva;
2558 nfsuint64 *cookiep, cookie;
2559 struct nfsnode *dnp = VTONFS(vp);
2560 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2561 int error = 0, attrflag, eof;
2562
2563 KASSERT(uiop->uio_iovcnt == 1 &&
2564 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2565 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2566 ("nfs readdirplusrpc bad uio"));
2567
2568 /*
2569 * If there is no cookie, assume directory was stale.
2570 */
2571 ncl_dircookie_lock(dnp);
2572 NFSUNLOCKNODE(dnp);
2573 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2574 if (cookiep) {
2575 cookie = *cookiep;
2576 ncl_dircookie_unlock(dnp);
2577 } else {
2578 ncl_dircookie_unlock(dnp);
2579 return (NFSERR_BAD_COOKIE);
2580 }
2581
2582 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2583 (void)ncl_fsinfo(nmp, vp, cred, td);
2584 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
2585 &attrflag, &eof);
2586 if (attrflag)
2587 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
2588
2589 if (!error) {
2590 /*
2591 * We are now either at end of the directory or have filled the
2592 * the block.
2593 */
2594 if (eof) {
2595 NFSLOCKNODE(dnp);
2596 dnp->n_direofoffset = uiop->uio_offset;
2597 NFSUNLOCKNODE(dnp);
2598 } else {
2599 if (uiop->uio_resid > 0)
2600 printf("EEK! readdirplusrpc resid > 0\n");
2601 ncl_dircookie_lock(dnp);
2602 NFSUNLOCKNODE(dnp);
2603 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2604 *cookiep = cookie;
2605 ncl_dircookie_unlock(dnp);
2606 }
2607 } else if (NFS_ISV4(vp)) {
2608 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2609 }
2610 return (error);
2611 }
2612
2613 /*
2614 * Silly rename. To make the NFS filesystem that is stateless look a little
2615 * more like the "ufs" a remove of an active vnode is translated to a rename
2616 * to a funny looking filename that is removed by nfs_inactive on the
2617 * nfsnode. There is the potential for another process on a different client
2618 * to create the same funny name between the nfs_lookitup() fails and the
2619 * nfs_rename() completes, but...
2620 */
2621 static int
nfs_sillyrename(struct vnode * dvp,struct vnode * vp,struct componentname * cnp)2622 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
2623 {
2624 struct sillyrename *sp;
2625 struct nfsnode *np;
2626 int error;
2627 short pid;
2628 unsigned int lticks;
2629
2630 cache_purge(dvp);
2631 np = VTONFS(vp);
2632 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
2633 sp = malloc(sizeof (struct sillyrename),
2634 M_NEWNFSREQ, M_WAITOK);
2635 sp->s_cred = crhold(cnp->cn_cred);
2636 sp->s_dvp = dvp;
2637 VREF(dvp);
2638
2639 /*
2640 * Fudge together a funny name.
2641 * Changing the format of the funny name to accommodate more
2642 * sillynames per directory.
2643 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is
2644 * CPU ticks since boot.
2645 */
2646 pid = curthread->td_proc->p_pid;
2647 lticks = (unsigned int)ticks;
2648 for ( ; ; ) {
2649 sp->s_namlen = sprintf(sp->s_name,
2650 ".nfs.%08x.%04x4.4", lticks,
2651 pid);
2652 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2653 curthread, NULL))
2654 break;
2655 lticks++;
2656 }
2657 error = nfs_renameit(dvp, vp, cnp, sp);
2658 if (error)
2659 goto bad;
2660 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2661 curthread, &np);
2662 np->n_sillyrename = sp;
2663 return (0);
2664 bad:
2665 vrele(sp->s_dvp);
2666 crfree(sp->s_cred);
2667 free(sp, M_NEWNFSREQ);
2668 return (error);
2669 }
2670
2671 /*
2672 * Look up a file name and optionally either update the file handle or
2673 * allocate an nfsnode, depending on the value of npp.
2674 * npp == NULL --> just do the lookup
2675 * *npp == NULL --> allocate a new nfsnode and make sure attributes are
2676 * handled too
2677 * *npp != NULL --> update the file handle in the vnode
2678 */
2679 static int
nfs_lookitup(struct vnode * dvp,char * name,int len,struct ucred * cred,struct thread * td,struct nfsnode ** npp)2680 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
2681 struct thread *td, struct nfsnode **npp)
2682 {
2683 struct vnode *newvp = NULL, *vp;
2684 struct nfsnode *np, *dnp = VTONFS(dvp);
2685 struct nfsfh *nfhp, *onfhp;
2686 struct nfsvattr nfsva, dnfsva;
2687 struct componentname cn;
2688 int error = 0, attrflag, dattrflag;
2689 u_int hash;
2690 struct timespec ts;
2691
2692 nanouptime(&ts);
2693 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
2694 &nfhp, &attrflag, &dattrflag, 0);
2695 if (dattrflag)
2696 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
2697 if (npp && !error) {
2698 if (*npp != NULL) {
2699 np = *npp;
2700 vp = NFSTOV(np);
2701 /*
2702 * For NFSv4, check to see if it is the same name and
2703 * replace the name, if it is different.
2704 */
2705 if (np->n_v4 != NULL && nfsva.na_type == VREG &&
2706 (np->n_v4->n4_namelen != len ||
2707 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
2708 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
2709 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2710 dnp->n_fhp->nfh_len))) {
2711 free(np->n_v4, M_NFSV4NODE);
2712 np->n_v4 = malloc(
2713 sizeof (struct nfsv4node) +
2714 dnp->n_fhp->nfh_len + len - 1,
2715 M_NFSV4NODE, M_WAITOK);
2716 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
2717 np->n_v4->n4_namelen = len;
2718 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2719 dnp->n_fhp->nfh_len);
2720 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
2721 }
2722 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
2723 FNV1_32_INIT);
2724 onfhp = np->n_fhp;
2725 /*
2726 * Rehash node for new file handle.
2727 */
2728 vfs_hash_rehash(vp, hash);
2729 np->n_fhp = nfhp;
2730 if (onfhp != NULL)
2731 free(onfhp, M_NFSFH);
2732 newvp = NFSTOV(np);
2733 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
2734 free(nfhp, M_NFSFH);
2735 VREF(dvp);
2736 newvp = dvp;
2737 } else {
2738 cn.cn_nameptr = name;
2739 cn.cn_namelen = len;
2740 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
2741 &np, LK_EXCLUSIVE);
2742 if (error)
2743 return (error);
2744 newvp = NFSTOV(np);
2745 /*
2746 * If n_localmodtime >= time before RPC, then
2747 * a file modification operation, such as
2748 * VOP_SETATTR() of size, has occurred while
2749 * the Lookup RPC and acquisition of the vnode
2750 * happened. As such, the attributes might
2751 * be stale, with possibly an incorrect size.
2752 */
2753 NFSLOCKNODE(np);
2754 if (timespecisset(&np->n_localmodtime) &&
2755 timespeccmp(&np->n_localmodtime, &ts, >=)) {
2756 NFSCL_DEBUG(4, "nfs_lookitup: localmod "
2757 "stale attributes\n");
2758 attrflag = 0;
2759 }
2760 NFSUNLOCKNODE(np);
2761 }
2762 if (!attrflag && *npp == NULL) {
2763 if (newvp == dvp)
2764 vrele(newvp);
2765 else
2766 vput(newvp);
2767 return (ENOENT);
2768 }
2769 if (attrflag)
2770 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
2771 }
2772 if (npp && *npp == NULL) {
2773 if (error) {
2774 if (newvp) {
2775 if (newvp == dvp)
2776 vrele(newvp);
2777 else
2778 vput(newvp);
2779 }
2780 } else
2781 *npp = np;
2782 }
2783 if (error && NFS_ISV4(dvp))
2784 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2785 return (error);
2786 }
2787
2788 /*
2789 * Nfs Version 3 and 4 commit rpc
2790 */
2791 int
ncl_commit(struct vnode * vp,u_quad_t offset,int cnt,struct ucred * cred,struct thread * td)2792 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
2793 struct thread *td)
2794 {
2795 struct nfsvattr nfsva;
2796 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2797 struct nfsnode *np;
2798 struct uio uio;
2799 int error, attrflag;
2800
2801 np = VTONFS(vp);
2802 error = EIO;
2803 attrflag = 0;
2804 if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) {
2805 uio.uio_offset = offset;
2806 uio.uio_resid = cnt;
2807 error = nfscl_doiods(vp, &uio, NULL, NULL,
2808 NFSV4OPEN_ACCESSWRITE, 1, cred, td);
2809 if (error != 0) {
2810 NFSLOCKNODE(np);
2811 np->n_flag &= ~NDSCOMMIT;
2812 NFSUNLOCKNODE(np);
2813 }
2814 }
2815 if (error != 0) {
2816 mtx_lock(&nmp->nm_mtx);
2817 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
2818 mtx_unlock(&nmp->nm_mtx);
2819 return (0);
2820 }
2821 mtx_unlock(&nmp->nm_mtx);
2822 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva,
2823 &attrflag);
2824 }
2825 if (attrflag != 0)
2826 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
2827 if (error != 0 && NFS_ISV4(vp))
2828 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2829 return (error);
2830 }
2831
2832 /*
2833 * Strategy routine.
2834 * For async requests when nfsiod(s) are running, queue the request by
2835 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
2836 * request.
2837 */
2838 static int
nfs_strategy(struct vop_strategy_args * ap)2839 nfs_strategy(struct vop_strategy_args *ap)
2840 {
2841 struct buf *bp;
2842 struct vnode *vp;
2843 struct ucred *cr;
2844
2845 bp = ap->a_bp;
2846 vp = ap->a_vp;
2847 KASSERT(bp->b_vp == vp, ("missing b_getvp"));
2848 KASSERT(!(bp->b_flags & B_DONE),
2849 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
2850
2851 if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno)
2852 bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize /
2853 DEV_BSIZE);
2854 if (bp->b_iocmd == BIO_READ)
2855 cr = bp->b_rcred;
2856 else
2857 cr = bp->b_wcred;
2858
2859 /*
2860 * If the op is asynchronous and an i/o daemon is waiting
2861 * queue the request, wake it up and wait for completion
2862 * otherwise just do it ourselves.
2863 */
2864 if ((bp->b_flags & B_ASYNC) == 0 ||
2865 ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread))
2866 (void) ncl_doio(vp, bp, cr, curthread, 1);
2867 return (0);
2868 }
2869
2870 /*
2871 * fsync vnode op. Just call ncl_flush() with commit == 1.
2872 */
2873 /* ARGSUSED */
2874 static int
nfs_fsync(struct vop_fsync_args * ap)2875 nfs_fsync(struct vop_fsync_args *ap)
2876 {
2877
2878 if (ap->a_vp->v_type != VREG) {
2879 /*
2880 * For NFS, metadata is changed synchronously on the server,
2881 * so there is nothing to flush. Also, ncl_flush() clears
2882 * the NMODIFIED flag and that shouldn't be done here for
2883 * directories.
2884 */
2885 return (0);
2886 }
2887 return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0));
2888 }
2889
2890 /*
2891 * Flush all the blocks associated with a vnode.
2892 * Walk through the buffer pool and push any dirty pages
2893 * associated with the vnode.
2894 * If the called_from_renewthread argument is TRUE, it has been called
2895 * from the NFSv4 renew thread and, as such, cannot block indefinitely
2896 * waiting for a buffer write to complete.
2897 */
2898 int
ncl_flush(struct vnode * vp,int waitfor,struct thread * td,int commit,int called_from_renewthread)2899 ncl_flush(struct vnode *vp, int waitfor, struct thread *td,
2900 int commit, int called_from_renewthread)
2901 {
2902 struct nfsnode *np = VTONFS(vp);
2903 struct buf *bp;
2904 int i;
2905 struct buf *nbp;
2906 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2907 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
2908 int passone = 1, trycnt = 0;
2909 u_quad_t off, endoff, toff;
2910 struct ucred* wcred = NULL;
2911 struct buf **bvec = NULL;
2912 struct bufobj *bo;
2913 #ifndef NFS_COMMITBVECSIZ
2914 #define NFS_COMMITBVECSIZ 20
2915 #endif
2916 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
2917 u_int bvecsize = 0, bveccount;
2918 struct timespec ts;
2919
2920 if (called_from_renewthread != 0)
2921 slptimeo = hz;
2922 if (nmp->nm_flag & NFSMNT_INT)
2923 slpflag = PCATCH;
2924 if (!commit)
2925 passone = 0;
2926 bo = &vp->v_bufobj;
2927 /*
2928 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
2929 * server, but has not been committed to stable storage on the server
2930 * yet. On the first pass, the byte range is worked out and the commit
2931 * rpc is done. On the second pass, bwrite() is called to do the
2932 * job.
2933 */
2934 again:
2935 off = (u_quad_t)-1;
2936 endoff = 0;
2937 bvecpos = 0;
2938 if (NFS_ISV34(vp) && commit) {
2939 if (bvec != NULL && bvec != bvec_on_stack)
2940 free(bvec, M_TEMP);
2941 /*
2942 * Count up how many buffers waiting for a commit.
2943 */
2944 bveccount = 0;
2945 BO_LOCK(bo);
2946 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2947 if (!BUF_ISLOCKED(bp) &&
2948 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
2949 == (B_DELWRI | B_NEEDCOMMIT))
2950 bveccount++;
2951 }
2952 /*
2953 * Allocate space to remember the list of bufs to commit. It is
2954 * important to use M_NOWAIT here to avoid a race with nfs_write.
2955 * If we can't get memory (for whatever reason), we will end up
2956 * committing the buffers one-by-one in the loop below.
2957 */
2958 if (bveccount > NFS_COMMITBVECSIZ) {
2959 /*
2960 * Release the vnode interlock to avoid a lock
2961 * order reversal.
2962 */
2963 BO_UNLOCK(bo);
2964 bvec = (struct buf **)
2965 malloc(bveccount * sizeof(struct buf *),
2966 M_TEMP, M_NOWAIT);
2967 BO_LOCK(bo);
2968 if (bvec == NULL) {
2969 bvec = bvec_on_stack;
2970 bvecsize = NFS_COMMITBVECSIZ;
2971 } else
2972 bvecsize = bveccount;
2973 } else {
2974 bvec = bvec_on_stack;
2975 bvecsize = NFS_COMMITBVECSIZ;
2976 }
2977 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2978 if (bvecpos >= bvecsize)
2979 break;
2980 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2981 nbp = TAILQ_NEXT(bp, b_bobufs);
2982 continue;
2983 }
2984 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
2985 (B_DELWRI | B_NEEDCOMMIT)) {
2986 BUF_UNLOCK(bp);
2987 nbp = TAILQ_NEXT(bp, b_bobufs);
2988 continue;
2989 }
2990 BO_UNLOCK(bo);
2991 bremfree(bp);
2992 /*
2993 * Work out if all buffers are using the same cred
2994 * so we can deal with them all with one commit.
2995 *
2996 * NOTE: we are not clearing B_DONE here, so we have
2997 * to do it later on in this routine if we intend to
2998 * initiate I/O on the bp.
2999 *
3000 * Note: to avoid loopback deadlocks, we do not
3001 * assign b_runningbufspace.
3002 */
3003 if (wcred == NULL)
3004 wcred = bp->b_wcred;
3005 else if (wcred != bp->b_wcred)
3006 wcred = NOCRED;
3007 vfs_busy_pages(bp, 0);
3008
3009 BO_LOCK(bo);
3010 /*
3011 * bp is protected by being locked, but nbp is not
3012 * and vfs_busy_pages() may sleep. We have to
3013 * recalculate nbp.
3014 */
3015 nbp = TAILQ_NEXT(bp, b_bobufs);
3016
3017 /*
3018 * A list of these buffers is kept so that the
3019 * second loop knows which buffers have actually
3020 * been committed. This is necessary, since there
3021 * may be a race between the commit rpc and new
3022 * uncommitted writes on the file.
3023 */
3024 bvec[bvecpos++] = bp;
3025 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
3026 bp->b_dirtyoff;
3027 if (toff < off)
3028 off = toff;
3029 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
3030 if (toff > endoff)
3031 endoff = toff;
3032 }
3033 BO_UNLOCK(bo);
3034 }
3035 if (bvecpos > 0) {
3036 /*
3037 * Commit data on the server, as required.
3038 * If all bufs are using the same wcred, then use that with
3039 * one call for all of them, otherwise commit each one
3040 * separately.
3041 */
3042 if (wcred != NOCRED)
3043 retv = ncl_commit(vp, off, (int)(endoff - off),
3044 wcred, td);
3045 else {
3046 retv = 0;
3047 for (i = 0; i < bvecpos; i++) {
3048 off_t off, size;
3049 bp = bvec[i];
3050 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
3051 bp->b_dirtyoff;
3052 size = (u_quad_t)(bp->b_dirtyend
3053 - bp->b_dirtyoff);
3054 retv = ncl_commit(vp, off, (int)size,
3055 bp->b_wcred, td);
3056 if (retv) break;
3057 }
3058 }
3059
3060 if (retv == NFSERR_STALEWRITEVERF)
3061 ncl_clearcommit(vp->v_mount);
3062
3063 /*
3064 * Now, either mark the blocks I/O done or mark the
3065 * blocks dirty, depending on whether the commit
3066 * succeeded.
3067 */
3068 for (i = 0; i < bvecpos; i++) {
3069 bp = bvec[i];
3070 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
3071 if (!NFSCL_FORCEDISM(vp->v_mount) && retv) {
3072 /*
3073 * Error, leave B_DELWRI intact
3074 */
3075 vfs_unbusy_pages(bp);
3076 brelse(bp);
3077 } else {
3078 /*
3079 * Success, remove B_DELWRI ( bundirty() ).
3080 *
3081 * b_dirtyoff/b_dirtyend seem to be NFS
3082 * specific. We should probably move that
3083 * into bundirty(). XXX
3084 */
3085 bufobj_wref(bo);
3086 bp->b_flags |= B_ASYNC;
3087 bundirty(bp);
3088 bp->b_flags &= ~B_DONE;
3089 bp->b_ioflags &= ~BIO_ERROR;
3090 bp->b_dirtyoff = bp->b_dirtyend = 0;
3091 bufdone(bp);
3092 }
3093 }
3094 }
3095
3096 /*
3097 * Start/do any write(s) that are required.
3098 */
3099 loop:
3100 BO_LOCK(bo);
3101 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
3102 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
3103 if (waitfor != MNT_WAIT || passone)
3104 continue;
3105
3106 error = BUF_TIMELOCK(bp,
3107 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
3108 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo);
3109 if (error == 0) {
3110 BUF_UNLOCK(bp);
3111 goto loop;
3112 }
3113 if (error == ENOLCK) {
3114 error = 0;
3115 goto loop;
3116 }
3117 if (called_from_renewthread != 0) {
3118 /*
3119 * Return EIO so the flush will be retried
3120 * later.
3121 */
3122 error = EIO;
3123 goto done;
3124 }
3125 if (newnfs_sigintr(nmp, td)) {
3126 error = EINTR;
3127 goto done;
3128 }
3129 if (slpflag == PCATCH) {
3130 slpflag = 0;
3131 slptimeo = 2 * hz;
3132 }
3133 goto loop;
3134 }
3135 if ((bp->b_flags & B_DELWRI) == 0)
3136 panic("nfs_fsync: not dirty");
3137 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
3138 BUF_UNLOCK(bp);
3139 continue;
3140 }
3141 BO_UNLOCK(bo);
3142 bremfree(bp);
3143 bp->b_flags |= B_ASYNC;
3144 bwrite(bp);
3145 if (newnfs_sigintr(nmp, td)) {
3146 error = EINTR;
3147 goto done;
3148 }
3149 goto loop;
3150 }
3151 if (passone) {
3152 passone = 0;
3153 BO_UNLOCK(bo);
3154 goto again;
3155 }
3156 if (waitfor == MNT_WAIT) {
3157 while (bo->bo_numoutput) {
3158 error = bufobj_wwait(bo, slpflag, slptimeo);
3159 if (error) {
3160 BO_UNLOCK(bo);
3161 if (called_from_renewthread != 0) {
3162 /*
3163 * Return EIO so that the flush will be
3164 * retried later.
3165 */
3166 error = EIO;
3167 goto done;
3168 }
3169 error = newnfs_sigintr(nmp, td);
3170 if (error)
3171 goto done;
3172 if (slpflag == PCATCH) {
3173 slpflag = 0;
3174 slptimeo = 2 * hz;
3175 }
3176 BO_LOCK(bo);
3177 }
3178 }
3179 if (bo->bo_dirty.bv_cnt != 0 && commit) {
3180 BO_UNLOCK(bo);
3181 goto loop;
3182 }
3183 /*
3184 * Wait for all the async IO requests to drain
3185 */
3186 BO_UNLOCK(bo);
3187 } else
3188 BO_UNLOCK(bo);
3189 if (NFSHASPNFS(nmp)) {
3190 nfscl_layoutcommit(vp, td);
3191 /*
3192 * Invalidate the attribute cache, since writes to a DS
3193 * won't update the size attribute.
3194 */
3195 NFSLOCKNODE(np);
3196 np->n_attrstamp = 0;
3197 } else
3198 NFSLOCKNODE(np);
3199 if (np->n_flag & NWRITEERR) {
3200 error = np->n_error;
3201 np->n_flag &= ~NWRITEERR;
3202 }
3203 if (commit && bo->bo_dirty.bv_cnt == 0 &&
3204 bo->bo_numoutput == 0)
3205 np->n_flag &= ~NMODIFIED;
3206 NFSUNLOCKNODE(np);
3207 done:
3208 if (bvec != NULL && bvec != bvec_on_stack)
3209 free(bvec, M_TEMP);
3210 if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
3211 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0)) {
3212 if (trycnt++ < 5) {
3213 /* try, try again... */
3214 passone = 1;
3215 wcred = NULL;
3216 bvec = NULL;
3217 bvecsize = 0;
3218 goto again;
3219 }
3220 vn_printf(vp, "ncl_flush failed");
3221 error = called_from_renewthread != 0 ? EIO : EBUSY;
3222 }
3223 if (error == 0) {
3224 nanouptime(&ts);
3225 NFSLOCKNODE(np);
3226 np->n_localmodtime = ts;
3227 NFSUNLOCKNODE(np);
3228 }
3229 return (error);
3230 }
3231
3232 /*
3233 * NFS advisory byte-level locks.
3234 */
3235 static int
nfs_advlock(struct vop_advlock_args * ap)3236 nfs_advlock(struct vop_advlock_args *ap)
3237 {
3238 struct vnode *vp = ap->a_vp;
3239 struct ucred *cred;
3240 struct nfsnode *np = VTONFS(ap->a_vp);
3241 struct proc *p = (struct proc *)ap->a_id;
3242 struct thread *td = curthread; /* XXX */
3243 struct vattr va;
3244 int ret, error;
3245 u_quad_t size;
3246 struct nfsmount *nmp;
3247
3248 error = NFSVOPLOCK(vp, LK_SHARED);
3249 if (error != 0)
3250 return (EBADF);
3251 nmp = VFSTONFS(vp->v_mount);
3252 if (!NFS_ISV4(vp) || (nmp->nm_flag & NFSMNT_NOLOCKD) != 0) {
3253 if ((nmp->nm_flag & NFSMNT_NOLOCKD) != 0) {
3254 size = np->n_size;
3255 NFSVOPUNLOCK(vp);
3256 error = lf_advlock(ap, &(vp->v_lockf), size);
3257 } else {
3258 if (nfs_advlock_p != NULL)
3259 error = nfs_advlock_p(ap);
3260 else {
3261 NFSVOPUNLOCK(vp);
3262 error = ENOLCK;
3263 }
3264 }
3265 if (error == 0 && ap->a_op == F_SETLK) {
3266 error = NFSVOPLOCK(vp, LK_SHARED);
3267 if (error == 0) {
3268 /* Mark that a file lock has been acquired. */
3269 NFSLOCKNODE(np);
3270 np->n_flag |= NHASBEENLOCKED;
3271 NFSUNLOCKNODE(np);
3272 NFSVOPUNLOCK(vp);
3273 }
3274 }
3275 return (error);
3276 } else if ((ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
3277 if (vp->v_type != VREG) {
3278 error = EINVAL;
3279 goto out;
3280 }
3281 if ((ap->a_flags & F_POSIX) != 0)
3282 cred = p->p_ucred;
3283 else
3284 cred = td->td_ucred;
3285 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
3286 if (VN_IS_DOOMED(vp)) {
3287 error = EBADF;
3288 goto out;
3289 }
3290
3291 /*
3292 * If this is unlocking a write locked region, flush and
3293 * commit them before unlocking. This is required by
3294 * RFC3530 Sec. 9.3.2.
3295 */
3296 if (ap->a_op == F_UNLCK &&
3297 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
3298 ap->a_flags))
3299 (void) ncl_flush(vp, MNT_WAIT, td, 1, 0);
3300
3301 /*
3302 * Mark NFS node as might have acquired a lock.
3303 * This is separate from NHASBEENLOCKED, because it must
3304 * be done before the nfsrpc_advlock() call, which might
3305 * add a nfscllock structure to the client state.
3306 * It is used to check for the case where a nfscllock
3307 * state structure cannot exist for the file.
3308 * Only done for "oneopenown" NFSv4.1/4.2 mounts.
3309 */
3310 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp)) {
3311 NFSLOCKNODE(np);
3312 np->n_flag |= NMIGHTBELOCKED;
3313 NFSUNLOCKNODE(np);
3314 }
3315
3316 /*
3317 * Loop around doing the lock op, while a blocking lock
3318 * must wait for the lock op to succeed.
3319 */
3320 do {
3321 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
3322 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
3323 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3324 ap->a_op == F_SETLK) {
3325 NFSVOPUNLOCK(vp);
3326 error = nfs_catnap(PZERO | PCATCH, ret,
3327 "ncladvl");
3328 if (error)
3329 return (EINTR);
3330 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
3331 if (VN_IS_DOOMED(vp)) {
3332 error = EBADF;
3333 goto out;
3334 }
3335 }
3336 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3337 ap->a_op == F_SETLK);
3338 if (ret == NFSERR_DENIED) {
3339 error = EAGAIN;
3340 goto out;
3341 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
3342 error = ret;
3343 goto out;
3344 } else if (ret != 0) {
3345 error = EACCES;
3346 goto out;
3347 }
3348
3349 /*
3350 * Now, if we just got a lock, invalidate data in the buffer
3351 * cache, as required, so that the coherency conforms with
3352 * RFC3530 Sec. 9.3.2.
3353 */
3354 if (ap->a_op == F_SETLK) {
3355 if ((np->n_flag & NMODIFIED) == 0) {
3356 np->n_attrstamp = 0;
3357 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3358 ret = VOP_GETATTR(vp, &va, cred);
3359 }
3360 if ((np->n_flag & NMODIFIED) || ret ||
3361 np->n_change != va.va_filerev) {
3362 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
3363 np->n_attrstamp = 0;
3364 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3365 ret = VOP_GETATTR(vp, &va, cred);
3366 if (!ret) {
3367 np->n_mtime = va.va_mtime;
3368 np->n_change = va.va_filerev;
3369 }
3370 }
3371 /* Mark that a file lock has been acquired. */
3372 NFSLOCKNODE(np);
3373 np->n_flag |= NHASBEENLOCKED;
3374 NFSUNLOCKNODE(np);
3375 }
3376 } else
3377 error = EOPNOTSUPP;
3378 out:
3379 NFSVOPUNLOCK(vp);
3380 return (error);
3381 }
3382
3383 /*
3384 * NFS advisory byte-level locks.
3385 */
3386 static int
nfs_advlockasync(struct vop_advlockasync_args * ap)3387 nfs_advlockasync(struct vop_advlockasync_args *ap)
3388 {
3389 struct vnode *vp = ap->a_vp;
3390 u_quad_t size;
3391 int error;
3392
3393 error = NFSVOPLOCK(vp, LK_SHARED);
3394 if (error)
3395 return (error);
3396 if (NFS_ISV4(vp)) {
3397 NFSVOPUNLOCK(vp);
3398 return (EOPNOTSUPP);
3399 }
3400 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
3401 size = VTONFS(vp)->n_size;
3402 NFSVOPUNLOCK(vp);
3403 error = lf_advlockasync(ap, &(vp->v_lockf), size);
3404 } else {
3405 NFSVOPUNLOCK(vp);
3406 error = EOPNOTSUPP;
3407 }
3408 return (error);
3409 }
3410
3411 /*
3412 * Print out the contents of an nfsnode.
3413 */
3414 static int
nfs_print(struct vop_print_args * ap)3415 nfs_print(struct vop_print_args *ap)
3416 {
3417 struct vnode *vp = ap->a_vp;
3418 struct nfsnode *np = VTONFS(vp);
3419
3420 printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid,
3421 (uintmax_t)np->n_vattr.na_fsid);
3422 if (vp->v_type == VFIFO)
3423 fifo_printinfo(vp);
3424 printf("\n");
3425 return (0);
3426 }
3427
3428 /*
3429 * nfs special file access vnode op.
3430 * Essentially just get vattr and then imitate iaccess() since the device is
3431 * local to the client.
3432 */
3433 static int
nfsspec_access(struct vop_access_args * ap)3434 nfsspec_access(struct vop_access_args *ap)
3435 {
3436 struct vattr *vap;
3437 struct ucred *cred = ap->a_cred;
3438 struct vnode *vp = ap->a_vp;
3439 accmode_t accmode = ap->a_accmode;
3440 struct vattr vattr;
3441 int error;
3442
3443 /*
3444 * Disallow write attempts on filesystems mounted read-only;
3445 * unless the file is a socket, fifo, or a block or character
3446 * device resident on the filesystem.
3447 */
3448 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
3449 switch (vp->v_type) {
3450 case VREG:
3451 case VDIR:
3452 case VLNK:
3453 return (EROFS);
3454 default:
3455 break;
3456 }
3457 }
3458 vap = &vattr;
3459 error = VOP_GETATTR(vp, vap, cred);
3460 if (error)
3461 goto out;
3462 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
3463 accmode, cred);
3464 out:
3465 return error;
3466 }
3467
3468 /*
3469 * Read wrapper for fifos.
3470 */
3471 static int
nfsfifo_read(struct vop_read_args * ap)3472 nfsfifo_read(struct vop_read_args *ap)
3473 {
3474 struct nfsnode *np = VTONFS(ap->a_vp);
3475 int error;
3476
3477 /*
3478 * Set access flag.
3479 */
3480 NFSLOCKNODE(np);
3481 np->n_flag |= NACC;
3482 vfs_timestamp(&np->n_atim);
3483 NFSUNLOCKNODE(np);
3484 error = fifo_specops.vop_read(ap);
3485 return error;
3486 }
3487
3488 /*
3489 * Write wrapper for fifos.
3490 */
3491 static int
nfsfifo_write(struct vop_write_args * ap)3492 nfsfifo_write(struct vop_write_args *ap)
3493 {
3494 struct nfsnode *np = VTONFS(ap->a_vp);
3495
3496 /*
3497 * Set update flag.
3498 */
3499 NFSLOCKNODE(np);
3500 np->n_flag |= NUPD;
3501 vfs_timestamp(&np->n_mtim);
3502 NFSUNLOCKNODE(np);
3503 return(fifo_specops.vop_write(ap));
3504 }
3505
3506 /*
3507 * Close wrapper for fifos.
3508 *
3509 * Update the times on the nfsnode then do fifo close.
3510 */
3511 static int
nfsfifo_close(struct vop_close_args * ap)3512 nfsfifo_close(struct vop_close_args *ap)
3513 {
3514 struct vnode *vp = ap->a_vp;
3515 struct nfsnode *np = VTONFS(vp);
3516 struct vattr vattr;
3517 struct timespec ts;
3518
3519 NFSLOCKNODE(np);
3520 if (np->n_flag & (NACC | NUPD)) {
3521 vfs_timestamp(&ts);
3522 if (np->n_flag & NACC)
3523 np->n_atim = ts;
3524 if (np->n_flag & NUPD)
3525 np->n_mtim = ts;
3526 np->n_flag |= NCHG;
3527 if (vrefcnt(vp) == 1 &&
3528 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
3529 VATTR_NULL(&vattr);
3530 if (np->n_flag & NACC)
3531 vattr.va_atime = np->n_atim;
3532 if (np->n_flag & NUPD)
3533 vattr.va_mtime = np->n_mtim;
3534 NFSUNLOCKNODE(np);
3535 (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
3536 goto out;
3537 }
3538 }
3539 NFSUNLOCKNODE(np);
3540 out:
3541 return (fifo_specops.vop_close(ap));
3542 }
3543
3544 static int
nfs_getacl(struct vop_getacl_args * ap)3545 nfs_getacl(struct vop_getacl_args *ap)
3546 {
3547 int error;
3548
3549 if (ap->a_type != ACL_TYPE_NFS4)
3550 return (EOPNOTSUPP);
3551 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp);
3552 if (error > NFSERR_STALE) {
3553 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3554 error = EPERM;
3555 }
3556 return (error);
3557 }
3558
3559 static int
nfs_setacl(struct vop_setacl_args * ap)3560 nfs_setacl(struct vop_setacl_args *ap)
3561 {
3562 int error;
3563
3564 if (ap->a_type != ACL_TYPE_NFS4)
3565 return (EOPNOTSUPP);
3566 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp);
3567 if (error > NFSERR_STALE) {
3568 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3569 error = EPERM;
3570 }
3571 return (error);
3572 }
3573
3574 /*
3575 * VOP_ADVISE for NFS.
3576 * Just return 0 for any errors, since it is just a hint.
3577 */
3578 static int
nfs_advise(struct vop_advise_args * ap)3579 nfs_advise(struct vop_advise_args *ap)
3580 {
3581 struct thread *td = curthread;
3582 struct nfsmount *nmp;
3583 uint64_t len;
3584 int error;
3585
3586 /*
3587 * First do vop_stdadvise() to handle the buffer cache.
3588 */
3589 error = vop_stdadvise(ap);
3590 if (error != 0)
3591 return (error);
3592 if (ap->a_start < 0 || ap->a_end < 0)
3593 return (0);
3594 if (ap->a_end == OFF_MAX)
3595 len = 0;
3596 else if (ap->a_end < ap->a_start)
3597 return (0);
3598 else
3599 len = ap->a_end - ap->a_start + 1;
3600 nmp = VFSTONFS(ap->a_vp->v_mount);
3601 mtx_lock(&nmp->nm_mtx);
3602 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
3603 (NFSHASPNFS(nmp) && (nmp->nm_privflag & NFSMNTP_IOADVISETHRUMDS) ==
3604 0) || (nmp->nm_privflag & NFSMNTP_NOADVISE) != 0) {
3605 mtx_unlock(&nmp->nm_mtx);
3606 return (0);
3607 }
3608 mtx_unlock(&nmp->nm_mtx);
3609 error = nfsrpc_advise(ap->a_vp, ap->a_start, len, ap->a_advice,
3610 td->td_ucred, td);
3611 if (error == NFSERR_NOTSUPP) {
3612 mtx_lock(&nmp->nm_mtx);
3613 nmp->nm_privflag |= NFSMNTP_NOADVISE;
3614 mtx_unlock(&nmp->nm_mtx);
3615 }
3616 return (0);
3617 }
3618
3619 /*
3620 * nfs allocate call
3621 */
3622 static int
nfs_allocate(struct vop_allocate_args * ap)3623 nfs_allocate(struct vop_allocate_args *ap)
3624 {
3625 struct vnode *vp = ap->a_vp;
3626 struct thread *td = curthread;
3627 struct nfsvattr nfsva;
3628 struct nfsmount *nmp;
3629 struct nfsnode *np;
3630 off_t alen;
3631 int attrflag, error, ret;
3632 struct timespec ts;
3633 struct uio io;
3634
3635 attrflag = 0;
3636 nmp = VFSTONFS(vp->v_mount);
3637 np = VTONFS(vp);
3638 mtx_lock(&nmp->nm_mtx);
3639 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION &&
3640 (nmp->nm_privflag & NFSMNTP_NOALLOCATE) == 0) {
3641 mtx_unlock(&nmp->nm_mtx);
3642 alen = *ap->a_len;
3643 if ((uint64_t)alen > nfs_maxalloclen)
3644 alen = nfs_maxalloclen;
3645
3646 /* Check the file size limit. */
3647 io.uio_offset = *ap->a_offset;
3648 io.uio_resid = alen;
3649 error = vn_rlimit_fsize(vp, &io, td);
3650
3651 /*
3652 * Flush first to ensure that the allocate adds to the
3653 * file's allocation on the server.
3654 */
3655 if (error == 0) {
3656 vnode_pager_clean_sync(vp);
3657 error = ncl_flush(vp, MNT_WAIT, td, 1, 0);
3658 }
3659 if (error == 0)
3660 error = nfsrpc_allocate(vp, *ap->a_offset, alen,
3661 &nfsva, &attrflag, ap->a_cred, td);
3662 if (error == 0) {
3663 *ap->a_offset += alen;
3664 *ap->a_len -= alen;
3665 nanouptime(&ts);
3666 NFSLOCKNODE(np);
3667 np->n_localmodtime = ts;
3668 NFSUNLOCKNODE(np);
3669 } else if (error == NFSERR_NOTSUPP) {
3670 mtx_lock(&nmp->nm_mtx);
3671 nmp->nm_privflag |= NFSMNTP_NOALLOCATE;
3672 mtx_unlock(&nmp->nm_mtx);
3673 error = EINVAL;
3674 }
3675 } else {
3676 mtx_unlock(&nmp->nm_mtx);
3677 error = EINVAL;
3678 }
3679 if (attrflag != 0) {
3680 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
3681 if (error == 0 && ret != 0)
3682 error = ret;
3683 }
3684 if (error != 0)
3685 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
3686 return (error);
3687 }
3688
3689 /*
3690 * nfs deallocate call
3691 */
3692 static int
nfs_deallocate(struct vop_deallocate_args * ap)3693 nfs_deallocate(struct vop_deallocate_args *ap)
3694 {
3695 struct vnode *vp = ap->a_vp;
3696 struct thread *td = curthread;
3697 struct nfsvattr nfsva;
3698 struct nfsmount *nmp;
3699 struct nfsnode *np;
3700 off_t tlen, mlen;
3701 int attrflag, error, ret;
3702 bool clipped;
3703 struct timespec ts;
3704
3705 error = 0;
3706 attrflag = 0;
3707 nmp = VFSTONFS(vp->v_mount);
3708 np = VTONFS(vp);
3709 mtx_lock(&nmp->nm_mtx);
3710 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION &&
3711 (nmp->nm_privflag & NFSMNTP_NODEALLOCATE) == 0) {
3712 mtx_unlock(&nmp->nm_mtx);
3713 tlen = omin(OFF_MAX - *ap->a_offset, *ap->a_len);
3714 NFSCL_DEBUG(4, "dealloc: off=%jd len=%jd maxfilesize=%ju\n",
3715 (intmax_t)*ap->a_offset, (intmax_t)tlen,
3716 (uintmax_t)nmp->nm_maxfilesize);
3717 if ((uint64_t)*ap->a_offset >= nmp->nm_maxfilesize) {
3718 /* Avoid EFBIG error return from the NFSv4.2 server. */
3719 *ap->a_len = 0;
3720 return (0);
3721 }
3722 clipped = false;
3723 if ((uint64_t)*ap->a_offset + tlen > nmp->nm_maxfilesize)
3724 tlen = nmp->nm_maxfilesize - *ap->a_offset;
3725 if ((uint64_t)*ap->a_offset < np->n_size) {
3726 /* Limit the len to nfs_maxalloclen before EOF. */
3727 mlen = omin((off_t)np->n_size - *ap->a_offset, tlen);
3728 if ((uint64_t)mlen > nfs_maxalloclen) {
3729 NFSCL_DEBUG(4, "dealloc: tlen maxalloclen\n");
3730 tlen = nfs_maxalloclen;
3731 clipped = true;
3732 }
3733 }
3734 if (error == 0)
3735 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
3736 if (error == 0) {
3737 vnode_pager_purge_range(vp, *ap->a_offset,
3738 *ap->a_offset + tlen);
3739 error = nfsrpc_deallocate(vp, *ap->a_offset, tlen,
3740 &nfsva, &attrflag, ap->a_cred, td);
3741 NFSCL_DEBUG(4, "dealloc: rpc=%d\n", error);
3742 }
3743 if (error == 0) {
3744 NFSCL_DEBUG(4, "dealloc: attrflag=%d na_size=%ju\n",
3745 attrflag, (uintmax_t)nfsva.na_size);
3746 nanouptime(&ts);
3747 NFSLOCKNODE(np);
3748 np->n_localmodtime = ts;
3749 NFSUNLOCKNODE(np);
3750 if (attrflag != 0) {
3751 if ((uint64_t)*ap->a_offset < nfsva.na_size)
3752 *ap->a_offset += omin((off_t)
3753 nfsva.na_size - *ap->a_offset,
3754 tlen);
3755 }
3756 if (clipped && tlen < *ap->a_len)
3757 *ap->a_len -= tlen;
3758 else
3759 *ap->a_len = 0;
3760 } else if (error == NFSERR_NOTSUPP) {
3761 mtx_lock(&nmp->nm_mtx);
3762 nmp->nm_privflag |= NFSMNTP_NODEALLOCATE;
3763 mtx_unlock(&nmp->nm_mtx);
3764 }
3765 } else {
3766 mtx_unlock(&nmp->nm_mtx);
3767 error = EIO;
3768 }
3769 /*
3770 * If the NFS server cannot perform the Deallocate operation, just call
3771 * vop_stddeallocate() to perform it.
3772 */
3773 if (error != 0 && error != NFSERR_FBIG && error != NFSERR_INVAL) {
3774 error = vop_stddeallocate(ap);
3775 NFSCL_DEBUG(4, "dealloc: stddeallocate=%d\n", error);
3776 }
3777 if (attrflag != 0) {
3778 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
3779 if (error == 0 && ret != 0)
3780 error = ret;
3781 }
3782 if (error != 0)
3783 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
3784 return (error);
3785 }
3786
3787 /*
3788 * nfs copy_file_range call
3789 */
3790 static int
nfs_copy_file_range(struct vop_copy_file_range_args * ap)3791 nfs_copy_file_range(struct vop_copy_file_range_args *ap)
3792 {
3793 struct vnode *invp = ap->a_invp;
3794 struct vnode *outvp = ap->a_outvp;
3795 struct mount *mp;
3796 vm_object_t invp_obj;
3797 struct nfsvattr innfsva, outnfsva;
3798 struct vattr va, *vap;
3799 struct uio io;
3800 struct nfsmount *nmp;
3801 size_t len, len2;
3802 ssize_t r;
3803 int error, inattrflag, outattrflag, ret, ret2, invp_lock;
3804 off_t inoff, outoff;
3805 bool consecutive, must_commit, tryoutcred;
3806
3807 /*
3808 * NFSv4.2 Copy is not permitted for infile == outfile.
3809 * TODO: copy_file_range() between multiple NFS mountpoints
3810 */
3811 if (invp == outvp || invp->v_mount != outvp->v_mount) {
3812 generic_copy:
3813 return (ENOSYS);
3814 }
3815
3816 invp_lock = LK_SHARED;
3817 relock:
3818
3819 /* Lock both vnodes, avoiding risk of deadlock. */
3820 do {
3821 mp = NULL;
3822 error = vn_start_write(outvp, &mp, V_WAIT);
3823 if (error == 0) {
3824 error = vn_lock(outvp, LK_EXCLUSIVE);
3825 if (error == 0) {
3826 error = vn_lock(invp, invp_lock | LK_NOWAIT);
3827 if (error == 0)
3828 break;
3829 VOP_UNLOCK(outvp);
3830 if (mp != NULL)
3831 vn_finished_write(mp);
3832 mp = NULL;
3833 error = vn_lock(invp, invp_lock);
3834 if (error == 0)
3835 VOP_UNLOCK(invp);
3836 }
3837 }
3838 if (mp != NULL)
3839 vn_finished_write(mp);
3840 } while (error == 0);
3841 if (error != 0)
3842 return (error);
3843
3844 /*
3845 * More reasons to avoid nfs copy: not NFSv4.2, or explicitly
3846 * disabled.
3847 */
3848 nmp = VFSTONFS(invp->v_mount);
3849 mtx_lock(&nmp->nm_mtx);
3850 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
3851 (nmp->nm_privflag & NFSMNTP_NOCOPY) != 0) {
3852 mtx_unlock(&nmp->nm_mtx);
3853 VOP_UNLOCK(invp);
3854 VOP_UNLOCK(outvp);
3855 if (mp != NULL)
3856 vn_finished_write(mp);
3857 goto generic_copy;
3858 }
3859 mtx_unlock(&nmp->nm_mtx);
3860
3861 /*
3862 * Do the vn_rlimit_fsize() check. Should this be above the VOP layer?
3863 */
3864 io.uio_offset = *ap->a_outoffp;
3865 io.uio_resid = *ap->a_lenp;
3866 error = vn_rlimit_fsizex(outvp, &io, 0, &r, ap->a_fsizetd);
3867 *ap->a_lenp = io.uio_resid;
3868 /*
3869 * No need to call vn_rlimit_fsizex_res before return, since the uio is
3870 * local.
3871 */
3872
3873 /*
3874 * Flush the input file so that the data is up to date before
3875 * the copy. Flush writes for the output file so that they
3876 * do not overwrite the data copied to the output file by the Copy.
3877 * Set the commit argument for both flushes so that the data is on
3878 * stable storage before the Copy RPC. This is done in case the
3879 * server reboots during the Copy and needs to be redone.
3880 */
3881 if (error == 0) {
3882 invp_obj = invp->v_object;
3883 if (invp_obj != NULL && vm_object_mightbedirty(invp_obj)) {
3884 if (invp_lock != LK_EXCLUSIVE) {
3885 invp_lock = LK_EXCLUSIVE;
3886 VOP_UNLOCK(invp);
3887 VOP_UNLOCK(outvp);
3888 if (mp != NULL)
3889 vn_finished_write(mp);
3890 goto relock;
3891 }
3892 vnode_pager_clean_sync(invp);
3893 }
3894 error = ncl_flush(invp, MNT_WAIT, curthread, 1, 0);
3895 }
3896 if (error == 0)
3897 error = ncl_vinvalbuf(outvp, V_SAVE, curthread, 0);
3898
3899 /* Do the actual NFSv4.2 RPC. */
3900 ret = ret2 = 0;
3901 len = *ap->a_lenp;
3902 mtx_lock(&nmp->nm_mtx);
3903 if ((nmp->nm_privflag & NFSMNTP_NOCONSECUTIVE) == 0)
3904 consecutive = true;
3905 else
3906 consecutive = false;
3907 mtx_unlock(&nmp->nm_mtx);
3908 inoff = *ap->a_inoffp;
3909 outoff = *ap->a_outoffp;
3910 tryoutcred = true;
3911 must_commit = false;
3912 if (error == 0) {
3913 vap = &VTONFS(invp)->n_vattr.na_vattr;
3914 error = VOP_GETATTR(invp, vap, ap->a_incred);
3915 if (error == 0) {
3916 /*
3917 * Clip "len" at va_size so that RFC compliant servers
3918 * will not reply NFSERR_INVAL.
3919 * Setting "len == 0" for the RPC would be preferred,
3920 * but some Linux servers do not support that.
3921 * If the len is being set to 0, do a Setattr RPC to
3922 * set the server's atime. This behaviour was the
3923 * preferred one for the FreeBSD "collective".
3924 */
3925 if (inoff >= vap->va_size) {
3926 *ap->a_lenp = len = 0;
3927 if ((nmp->nm_mountp->mnt_flag & MNT_NOATIME) ==
3928 0) {
3929 VATTR_NULL(&va);
3930 va.va_atime.tv_sec = 0;
3931 va.va_atime.tv_nsec = 0;
3932 va.va_vaflags = VA_UTIMES_NULL;
3933 inattrflag = 0;
3934 error = nfsrpc_setattr(invp, &va, NULL,
3935 ap->a_incred, curthread, &innfsva,
3936 &inattrflag);
3937 if (inattrflag != 0)
3938 ret = nfscl_loadattrcache(&invp,
3939 &innfsva, NULL, 0, 1);
3940 if (error == 0 && ret != 0)
3941 error = ret;
3942 }
3943 } else if (inoff + len > vap->va_size)
3944 *ap->a_lenp = len = vap->va_size - inoff;
3945 } else
3946 error = 0;
3947 }
3948
3949 /*
3950 * len will be set to 0 upon a successful Copy RPC.
3951 * As such, this only loops when the Copy RPC needs to be retried.
3952 */
3953 while (len > 0 && error == 0) {
3954 inattrflag = outattrflag = 0;
3955 len2 = len;
3956 if (tryoutcred)
3957 error = nfsrpc_copy_file_range(invp, ap->a_inoffp,
3958 outvp, ap->a_outoffp, &len2, ap->a_flags,
3959 &inattrflag, &innfsva, &outattrflag, &outnfsva,
3960 ap->a_outcred, consecutive, &must_commit);
3961 else
3962 error = nfsrpc_copy_file_range(invp, ap->a_inoffp,
3963 outvp, ap->a_outoffp, &len2, ap->a_flags,
3964 &inattrflag, &innfsva, &outattrflag, &outnfsva,
3965 ap->a_incred, consecutive, &must_commit);
3966 if (inattrflag != 0)
3967 ret = nfscl_loadattrcache(&invp, &innfsva, NULL, 0, 1);
3968 if (outattrflag != 0)
3969 ret2 = nfscl_loadattrcache(&outvp, &outnfsva, NULL,
3970 1, 1);
3971 if (error == 0) {
3972 if (consecutive == false) {
3973 if (len2 == len) {
3974 mtx_lock(&nmp->nm_mtx);
3975 nmp->nm_privflag |=
3976 NFSMNTP_NOCONSECUTIVE;
3977 mtx_unlock(&nmp->nm_mtx);
3978 } else
3979 error = NFSERR_OFFLOADNOREQS;
3980 }
3981 *ap->a_lenp = len2;
3982 len = 0;
3983 if (len2 > 0 && must_commit && error == 0)
3984 error = ncl_commit(outvp, outoff, *ap->a_lenp,
3985 ap->a_outcred, curthread);
3986 if (error == 0 && ret != 0)
3987 error = ret;
3988 if (error == 0 && ret2 != 0)
3989 error = ret2;
3990 } else if (error == NFSERR_OFFLOADNOREQS && consecutive) {
3991 /*
3992 * Try consecutive == false, which is ok only if all
3993 * bytes are copied.
3994 * If only some bytes were copied when consecutive
3995 * is false, there is no way to know which bytes
3996 * still need to be written.
3997 */
3998 consecutive = false;
3999 error = 0;
4000 } else if (error == NFSERR_ACCES && tryoutcred) {
4001 /* Try again with incred. */
4002 tryoutcred = false;
4003 error = 0;
4004 }
4005 if (error == NFSERR_STALEWRITEVERF) {
4006 /*
4007 * Server rebooted, so do it all again.
4008 */
4009 *ap->a_inoffp = inoff;
4010 *ap->a_outoffp = outoff;
4011 len = *ap->a_lenp;
4012 must_commit = false;
4013 error = 0;
4014 }
4015 }
4016 VOP_UNLOCK(invp);
4017 VOP_UNLOCK(outvp);
4018 if (mp != NULL)
4019 vn_finished_write(mp);
4020 if (error == NFSERR_NOTSUPP || error == NFSERR_OFFLOADNOREQS ||
4021 error == NFSERR_ACCES) {
4022 /*
4023 * Unlike the NFSv4.2 Copy, vn_generic_copy_file_range() can
4024 * use a_incred for the read and a_outcred for the write, so
4025 * try this for NFSERR_ACCES failures for the Copy.
4026 * For NFSERR_NOTSUPP and NFSERR_OFFLOADNOREQS, the Copy can
4027 * never succeed, so disable it.
4028 */
4029 if (error != NFSERR_ACCES) {
4030 /* Can never do Copy on this mount. */
4031 mtx_lock(&nmp->nm_mtx);
4032 nmp->nm_privflag |= NFSMNTP_NOCOPY;
4033 mtx_unlock(&nmp->nm_mtx);
4034 }
4035 *ap->a_inoffp = inoff;
4036 *ap->a_outoffp = outoff;
4037 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp,
4038 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags,
4039 ap->a_incred, ap->a_outcred, ap->a_fsizetd);
4040 } else if (error != 0)
4041 *ap->a_lenp = 0;
4042
4043 if (error != 0)
4044 error = nfscl_maperr(curthread, error, (uid_t)0, (gid_t)0);
4045 return (error);
4046 }
4047
4048 /*
4049 * nfs ioctl call
4050 */
4051 static int
nfs_ioctl(struct vop_ioctl_args * ap)4052 nfs_ioctl(struct vop_ioctl_args *ap)
4053 {
4054 struct vnode *vp = ap->a_vp;
4055 struct nfsvattr nfsva;
4056 struct nfsmount *nmp;
4057 int attrflag, content, error, ret;
4058 bool eof = false; /* shut up compiler. */
4059
4060 /* Do the actual NFSv4.2 RPC. */
4061 switch (ap->a_command) {
4062 case FIOSEEKDATA:
4063 content = NFSV4CONTENT_DATA;
4064 break;
4065 case FIOSEEKHOLE:
4066 content = NFSV4CONTENT_HOLE;
4067 break;
4068 default:
4069 return (ENOTTY);
4070 }
4071
4072 error = vn_lock(vp, LK_EXCLUSIVE);
4073 if (error != 0)
4074 return (EBADF);
4075
4076 if (vp->v_type != VREG) {
4077 VOP_UNLOCK(vp);
4078 return (ENOTTY);
4079 }
4080 nmp = VFSTONFS(vp->v_mount);
4081 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION) {
4082 VOP_UNLOCK(vp);
4083 error = vop_stdioctl(ap);
4084 return (error);
4085 }
4086
4087 attrflag = 0;
4088 if (*((off_t *)ap->a_data) >= VTONFS(vp)->n_size)
4089 error = ENXIO;
4090 else {
4091 /*
4092 * Flush all writes, so that the server is up to date.
4093 * Although a Commit is not required, the commit argument
4094 * is set so that, for a pNFS File/Flexible File Layout
4095 * server, the LayoutCommit will be done to ensure the file
4096 * size is up to date on the Metadata Server.
4097 */
4098
4099 vnode_pager_clean_sync(vp);
4100 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 1, 0);
4101 if (error == 0)
4102 error = nfsrpc_seek(vp, (off_t *)ap->a_data, &eof,
4103 content, ap->a_cred, &nfsva, &attrflag);
4104 /* If at eof for FIOSEEKDATA, return ENXIO. */
4105 if (eof && error == 0 && content == NFSV4CONTENT_DATA)
4106 error = ENXIO;
4107 }
4108 if (attrflag != 0) {
4109 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4110 if (error == 0 && ret != 0)
4111 error = ret;
4112 }
4113 NFSVOPUNLOCK(vp);
4114
4115 if (error != 0)
4116 error = ENXIO;
4117 return (error);
4118 }
4119
4120 /*
4121 * nfs getextattr call
4122 */
4123 static int
nfs_getextattr(struct vop_getextattr_args * ap)4124 nfs_getextattr(struct vop_getextattr_args *ap)
4125 {
4126 struct vnode *vp = ap->a_vp;
4127 struct nfsmount *nmp;
4128 struct ucred *cred;
4129 struct thread *td = ap->a_td;
4130 struct nfsvattr nfsva;
4131 ssize_t len;
4132 int attrflag, error, ret;
4133
4134 nmp = VFSTONFS(vp->v_mount);
4135 mtx_lock(&nmp->nm_mtx);
4136 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4137 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4138 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4139 mtx_unlock(&nmp->nm_mtx);
4140 return (EOPNOTSUPP);
4141 }
4142 mtx_unlock(&nmp->nm_mtx);
4143
4144 cred = ap->a_cred;
4145 if (cred == NULL)
4146 cred = td->td_ucred;
4147 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
4148 attrflag = 0;
4149 error = nfsrpc_getextattr(vp, ap->a_name, ap->a_uio, &len, &nfsva,
4150 &attrflag, cred, td);
4151 if (attrflag != 0) {
4152 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4153 if (error == 0 && ret != 0)
4154 error = ret;
4155 }
4156 if (error == 0 && ap->a_size != NULL)
4157 *ap->a_size = len;
4158
4159 switch (error) {
4160 case NFSERR_NOTSUPP:
4161 case NFSERR_OPILLEGAL:
4162 mtx_lock(&nmp->nm_mtx);
4163 nmp->nm_privflag |= NFSMNTP_NOXATTR;
4164 mtx_unlock(&nmp->nm_mtx);
4165 error = EOPNOTSUPP;
4166 break;
4167 case NFSERR_NOXATTR:
4168 case NFSERR_XATTR2BIG:
4169 error = ENOATTR;
4170 break;
4171 default:
4172 error = nfscl_maperr(td, error, 0, 0);
4173 break;
4174 }
4175 return (error);
4176 }
4177
4178 /*
4179 * nfs setextattr call
4180 */
4181 static int
nfs_setextattr(struct vop_setextattr_args * ap)4182 nfs_setextattr(struct vop_setextattr_args *ap)
4183 {
4184 struct vnode *vp = ap->a_vp;
4185 struct nfsmount *nmp;
4186 struct ucred *cred;
4187 struct thread *td = ap->a_td;
4188 struct nfsvattr nfsva;
4189 int attrflag, error, ret;
4190
4191 nmp = VFSTONFS(vp->v_mount);
4192 mtx_lock(&nmp->nm_mtx);
4193 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4194 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4195 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4196 mtx_unlock(&nmp->nm_mtx);
4197 return (EOPNOTSUPP);
4198 }
4199 mtx_unlock(&nmp->nm_mtx);
4200
4201 if (ap->a_uio->uio_resid < 0)
4202 return (EINVAL);
4203 cred = ap->a_cred;
4204 if (cred == NULL)
4205 cred = td->td_ucred;
4206 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
4207 attrflag = 0;
4208 error = nfsrpc_setextattr(vp, ap->a_name, ap->a_uio, &nfsva,
4209 &attrflag, cred, td);
4210 if (attrflag != 0) {
4211 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4212 if (error == 0 && ret != 0)
4213 error = ret;
4214 }
4215
4216 switch (error) {
4217 case NFSERR_NOTSUPP:
4218 case NFSERR_OPILLEGAL:
4219 mtx_lock(&nmp->nm_mtx);
4220 nmp->nm_privflag |= NFSMNTP_NOXATTR;
4221 mtx_unlock(&nmp->nm_mtx);
4222 error = EOPNOTSUPP;
4223 break;
4224 case NFSERR_NOXATTR:
4225 case NFSERR_XATTR2BIG:
4226 error = ENOATTR;
4227 break;
4228 default:
4229 error = nfscl_maperr(td, error, 0, 0);
4230 break;
4231 }
4232 return (error);
4233 }
4234
4235 /*
4236 * nfs listextattr call
4237 */
4238 static int
nfs_listextattr(struct vop_listextattr_args * ap)4239 nfs_listextattr(struct vop_listextattr_args *ap)
4240 {
4241 struct vnode *vp = ap->a_vp;
4242 struct nfsmount *nmp;
4243 struct ucred *cred;
4244 struct thread *td = ap->a_td;
4245 struct nfsvattr nfsva;
4246 size_t len, len2;
4247 uint64_t cookie;
4248 int attrflag, error, ret;
4249 bool eof;
4250
4251 nmp = VFSTONFS(vp->v_mount);
4252 mtx_lock(&nmp->nm_mtx);
4253 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4254 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4255 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4256 mtx_unlock(&nmp->nm_mtx);
4257 return (EOPNOTSUPP);
4258 }
4259 mtx_unlock(&nmp->nm_mtx);
4260
4261 cred = ap->a_cred;
4262 if (cred == NULL)
4263 cred = td->td_ucred;
4264
4265 /* Loop around doing List Extended Attribute RPCs. */
4266 eof = false;
4267 cookie = 0;
4268 len2 = 0;
4269 error = 0;
4270 while (!eof && error == 0) {
4271 len = nmp->nm_rsize;
4272 attrflag = 0;
4273 error = nfsrpc_listextattr(vp, &cookie, ap->a_uio, &len, &eof,
4274 &nfsva, &attrflag, cred, td);
4275 if (attrflag != 0) {
4276 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4277 if (error == 0 && ret != 0)
4278 error = ret;
4279 }
4280 if (error == 0) {
4281 len2 += len;
4282 if (len2 > SSIZE_MAX)
4283 error = ENOATTR;
4284 }
4285 }
4286 if (error == 0 && ap->a_size != NULL)
4287 *ap->a_size = len2;
4288
4289 switch (error) {
4290 case NFSERR_NOTSUPP:
4291 case NFSERR_OPILLEGAL:
4292 mtx_lock(&nmp->nm_mtx);
4293 nmp->nm_privflag |= NFSMNTP_NOXATTR;
4294 mtx_unlock(&nmp->nm_mtx);
4295 error = EOPNOTSUPP;
4296 break;
4297 case NFSERR_NOXATTR:
4298 case NFSERR_XATTR2BIG:
4299 error = ENOATTR;
4300 break;
4301 default:
4302 error = nfscl_maperr(td, error, 0, 0);
4303 break;
4304 }
4305 return (error);
4306 }
4307
4308 /*
4309 * nfs setextattr call
4310 */
4311 static int
nfs_deleteextattr(struct vop_deleteextattr_args * ap)4312 nfs_deleteextattr(struct vop_deleteextattr_args *ap)
4313 {
4314 struct vnode *vp = ap->a_vp;
4315 struct nfsmount *nmp;
4316 struct nfsvattr nfsva;
4317 int attrflag, error, ret;
4318
4319 nmp = VFSTONFS(vp->v_mount);
4320 mtx_lock(&nmp->nm_mtx);
4321 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4322 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4323 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4324 mtx_unlock(&nmp->nm_mtx);
4325 return (EOPNOTSUPP);
4326 }
4327 mtx_unlock(&nmp->nm_mtx);
4328
4329 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
4330 attrflag = 0;
4331 error = nfsrpc_rmextattr(vp, ap->a_name, &nfsva, &attrflag, ap->a_cred,
4332 ap->a_td);
4333 if (attrflag != 0) {
4334 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4335 if (error == 0 && ret != 0)
4336 error = ret;
4337 }
4338
4339 switch (error) {
4340 case NFSERR_NOTSUPP:
4341 case NFSERR_OPILLEGAL:
4342 mtx_lock(&nmp->nm_mtx);
4343 nmp->nm_privflag |= NFSMNTP_NOXATTR;
4344 mtx_unlock(&nmp->nm_mtx);
4345 error = EOPNOTSUPP;
4346 break;
4347 case NFSERR_NOXATTR:
4348 case NFSERR_XATTR2BIG:
4349 error = ENOATTR;
4350 break;
4351 default:
4352 error = nfscl_maperr(ap->a_td, error, 0, 0);
4353 break;
4354 }
4355 return (error);
4356 }
4357
4358 /*
4359 * Return POSIX pathconf information applicable to nfs filesystems.
4360 */
4361 static int
nfs_pathconf(struct vop_pathconf_args * ap)4362 nfs_pathconf(struct vop_pathconf_args *ap)
4363 {
4364 struct nfsv3_pathconf pc;
4365 struct nfsvattr nfsva;
4366 struct vnode *vp = ap->a_vp;
4367 struct nfsmount *nmp;
4368 struct thread *td = curthread;
4369 off_t off;
4370 bool eof;
4371 int attrflag, error;
4372
4373 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX ||
4374 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
4375 ap->a_name == _PC_NO_TRUNC)) ||
4376 (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) {
4377 /*
4378 * Since only the above 4 a_names are returned by the NFSv3
4379 * Pathconf RPC, there is no point in doing it for others.
4380 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can
4381 * be used for _PC_NFS4_ACL as well.
4382 */
4383 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva,
4384 &attrflag);
4385 if (attrflag != 0)
4386 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4387 if (error != 0)
4388 return (error);
4389 } else {
4390 /*
4391 * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
4392 * just fake them.
4393 */
4394 pc.pc_linkmax = NFS_LINK_MAX;
4395 pc.pc_namemax = NFS_MAXNAMLEN;
4396 pc.pc_notrunc = 1;
4397 pc.pc_chownrestricted = 1;
4398 pc.pc_caseinsensitive = 0;
4399 pc.pc_casepreserving = 1;
4400 error = 0;
4401 }
4402 switch (ap->a_name) {
4403 case _PC_LINK_MAX:
4404 #ifdef _LP64
4405 *ap->a_retval = pc.pc_linkmax;
4406 #else
4407 *ap->a_retval = MIN(LONG_MAX, pc.pc_linkmax);
4408 #endif
4409 break;
4410 case _PC_NAME_MAX:
4411 *ap->a_retval = pc.pc_namemax;
4412 break;
4413 case _PC_PIPE_BUF:
4414 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO)
4415 *ap->a_retval = PIPE_BUF;
4416 else
4417 error = EINVAL;
4418 break;
4419 case _PC_CHOWN_RESTRICTED:
4420 *ap->a_retval = pc.pc_chownrestricted;
4421 break;
4422 case _PC_NO_TRUNC:
4423 *ap->a_retval = pc.pc_notrunc;
4424 break;
4425 case _PC_ACL_NFS4:
4426 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
4427 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
4428 *ap->a_retval = 1;
4429 else
4430 *ap->a_retval = 0;
4431 break;
4432 case _PC_ACL_PATH_MAX:
4433 if (NFS_ISV4(vp))
4434 *ap->a_retval = ACL_MAX_ENTRIES;
4435 else
4436 *ap->a_retval = 3;
4437 break;
4438 case _PC_PRIO_IO:
4439 *ap->a_retval = 0;
4440 break;
4441 case _PC_SYNC_IO:
4442 *ap->a_retval = 0;
4443 break;
4444 case _PC_ALLOC_SIZE_MIN:
4445 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
4446 break;
4447 case _PC_FILESIZEBITS:
4448 if (NFS_ISV34(vp))
4449 *ap->a_retval = 64;
4450 else
4451 *ap->a_retval = 32;
4452 break;
4453 case _PC_REC_INCR_XFER_SIZE:
4454 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
4455 break;
4456 case _PC_REC_MAX_XFER_SIZE:
4457 *ap->a_retval = -1; /* means ``unlimited'' */
4458 break;
4459 case _PC_REC_MIN_XFER_SIZE:
4460 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
4461 break;
4462 case _PC_REC_XFER_ALIGN:
4463 *ap->a_retval = PAGE_SIZE;
4464 break;
4465 case _PC_SYMLINK_MAX:
4466 *ap->a_retval = NFS_MAXPATHLEN;
4467 break;
4468 case _PC_MIN_HOLE_SIZE:
4469 /* Only some NFSv4.2 servers support Seek for Holes. */
4470 *ap->a_retval = 0;
4471 nmp = VFSTONFS(vp->v_mount);
4472 if (NFS_ISV4(vp) && nmp->nm_minorvers == NFSV42_MINORVERSION) {
4473 /*
4474 * NFSv4.2 doesn't have an attribute for hole size,
4475 * so all we can do is see if the Seek operation is
4476 * supported and then use f_iosize as a "best guess".
4477 */
4478 mtx_lock(&nmp->nm_mtx);
4479 if ((nmp->nm_privflag & NFSMNTP_SEEKTESTED) == 0) {
4480 mtx_unlock(&nmp->nm_mtx);
4481 off = 0;
4482 attrflag = 0;
4483 error = nfsrpc_seek(vp, &off, &eof,
4484 NFSV4CONTENT_HOLE, td->td_ucred, &nfsva,
4485 &attrflag);
4486 if (attrflag != 0)
4487 (void) nfscl_loadattrcache(&vp, &nfsva,
4488 NULL, 0, 1);
4489 mtx_lock(&nmp->nm_mtx);
4490 if (error == NFSERR_NOTSUPP)
4491 nmp->nm_privflag |= NFSMNTP_SEEKTESTED;
4492 else
4493 nmp->nm_privflag |= NFSMNTP_SEEKTESTED |
4494 NFSMNTP_SEEK;
4495 error = 0;
4496 }
4497 if ((nmp->nm_privflag & NFSMNTP_SEEK) != 0)
4498 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
4499 mtx_unlock(&nmp->nm_mtx);
4500 }
4501 break;
4502
4503 default:
4504 error = vop_stdpathconf(ap);
4505 break;
4506 }
4507 return (error);
4508 }
4509