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_copy_file_range_t nfs_copy_file_range;
149 static vop_ioctl_t nfs_ioctl;
150 static vop_getextattr_t nfs_getextattr;
151 static vop_setextattr_t nfs_setextattr;
152 static vop_listextattr_t nfs_listextattr;
153 static vop_deleteextattr_t nfs_deleteextattr;
154 static vop_lock1_t nfs_lock;
155
156 /*
157 * Global vfs data structures for nfs
158 */
159
160 static struct vop_vector newnfs_vnodeops_nosig = {
161 .vop_default = &default_vnodeops,
162 .vop_access = nfs_access,
163 .vop_advlock = nfs_advlock,
164 .vop_advlockasync = nfs_advlockasync,
165 .vop_close = nfs_close,
166 .vop_create = nfs_create,
167 .vop_fsync = nfs_fsync,
168 .vop_getattr = nfs_getattr,
169 .vop_getpages = ncl_getpages,
170 .vop_putpages = ncl_putpages,
171 .vop_inactive = ncl_inactive,
172 .vop_link = nfs_link,
173 .vop_lock1 = nfs_lock,
174 .vop_lookup = nfs_lookup,
175 .vop_mkdir = nfs_mkdir,
176 .vop_mknod = nfs_mknod,
177 .vop_open = nfs_open,
178 .vop_pathconf = nfs_pathconf,
179 .vop_print = nfs_print,
180 .vop_read = nfs_read,
181 .vop_readdir = nfs_readdir,
182 .vop_readlink = nfs_readlink,
183 .vop_reclaim = ncl_reclaim,
184 .vop_remove = nfs_remove,
185 .vop_rename = nfs_rename,
186 .vop_rmdir = nfs_rmdir,
187 .vop_setattr = nfs_setattr,
188 .vop_strategy = nfs_strategy,
189 .vop_symlink = nfs_symlink,
190 .vop_write = ncl_write,
191 .vop_getacl = nfs_getacl,
192 .vop_setacl = nfs_setacl,
193 .vop_advise = nfs_advise,
194 .vop_allocate = nfs_allocate,
195 .vop_copy_file_range = nfs_copy_file_range,
196 .vop_ioctl = nfs_ioctl,
197 .vop_getextattr = nfs_getextattr,
198 .vop_setextattr = nfs_setextattr,
199 .vop_listextattr = nfs_listextattr,
200 .vop_deleteextattr = nfs_deleteextattr,
201 };
202 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops_nosig);
203
204 static int
nfs_vnodeops_bypass(struct vop_generic_args * a)205 nfs_vnodeops_bypass(struct vop_generic_args *a)
206 {
207
208 return (vop_sigdefer(&newnfs_vnodeops_nosig, a));
209 }
210
211 struct vop_vector newnfs_vnodeops = {
212 .vop_default = &default_vnodeops,
213 .vop_bypass = nfs_vnodeops_bypass,
214 };
215 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops);
216
217 static struct vop_vector newnfs_fifoops_nosig = {
218 .vop_default = &fifo_specops,
219 .vop_access = nfsspec_access,
220 .vop_close = nfsfifo_close,
221 .vop_fsync = nfs_fsync,
222 .vop_getattr = nfs_getattr,
223 .vop_inactive = ncl_inactive,
224 .vop_pathconf = nfs_pathconf,
225 .vop_print = nfs_print,
226 .vop_read = nfsfifo_read,
227 .vop_reclaim = ncl_reclaim,
228 .vop_setattr = nfs_setattr,
229 .vop_write = nfsfifo_write,
230 };
231 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops_nosig);
232
233 static int
nfs_fifoops_bypass(struct vop_generic_args * a)234 nfs_fifoops_bypass(struct vop_generic_args *a)
235 {
236
237 return (vop_sigdefer(&newnfs_fifoops_nosig, a));
238 }
239
240 struct vop_vector newnfs_fifoops = {
241 .vop_default = &default_vnodeops,
242 .vop_bypass = nfs_fifoops_bypass,
243 };
244 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops);
245
246 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
247 struct componentname *cnp, struct vattr *vap);
248 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
249 int namelen, struct ucred *cred, struct thread *td);
250 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp,
251 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp,
252 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td);
253 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp,
254 struct componentname *scnp, struct sillyrename *sp);
255
256 /*
257 * Global variables
258 */
259 SYSCTL_DECL(_vfs_nfs);
260
261 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
262 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
263 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
264
265 static int nfs_prime_access_cache = 0;
266 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
267 &nfs_prime_access_cache, 0,
268 "Prime NFS ACCESS cache when fetching attributes");
269
270 static int newnfs_commit_on_close = 0;
271 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW,
272 &newnfs_commit_on_close, 0, "write+commit on close, else only write");
273
274 static int nfs_clean_pages_on_close = 1;
275 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
276 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
277
278 int newnfs_directio_enable = 0;
279 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
280 &newnfs_directio_enable, 0, "Enable NFS directio");
281
282 int nfs_keep_dirty_on_error;
283 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW,
284 &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned");
285
286 /*
287 * This sysctl allows other processes to mmap a file that has been opened
288 * O_DIRECT by a process. In general, having processes mmap the file while
289 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow
290 * this by default to prevent DoS attacks - to prevent a malicious user from
291 * opening up files O_DIRECT preventing other users from mmap'ing these
292 * files. "Protected" environments where stricter consistency guarantees are
293 * required can disable this knob. The process that opened the file O_DIRECT
294 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
295 * meaningful.
296 */
297 int newnfs_directio_allow_mmap = 1;
298 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
299 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
300
301 static uint64_t nfs_maxalloclen = 64 * 1024 * 1024;
302 SYSCTL_U64(_vfs_nfs, OID_AUTO, maxalloclen, CTLFLAG_RW,
303 &nfs_maxalloclen, 0, "NFS max allocate/deallocate length");
304
305 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \
306 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \
307 | NFSACCESS_DELETE | NFSACCESS_LOOKUP)
308
309 /*
310 * SMP Locking Note :
311 * The list of locks after the description of the lock is the ordering
312 * of other locks acquired with the lock held.
313 * np->n_mtx : Protects the fields in the nfsnode.
314 VM Object Lock
315 VI_MTX (acquired indirectly)
316 * nmp->nm_mtx : Protects the fields in the nfsmount.
317 rep->r_mtx
318 * ncl_iod_mutex : Global lock, protects shared nfsiod state.
319 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
320 nmp->nm_mtx
321 rep->r_mtx
322 * rep->r_mtx : Protects the fields in an nfsreq.
323 */
324
325 static int
nfs_lock(struct vop_lock1_args * ap)326 nfs_lock(struct vop_lock1_args *ap)
327 {
328 struct vnode *vp;
329 struct nfsnode *np;
330 u_quad_t nsize;
331 int error, lktype;
332 bool onfault;
333
334 vp = ap->a_vp;
335 lktype = ap->a_flags & LK_TYPE_MASK;
336 error = VOP_LOCK1_APV(&default_vnodeops, ap);
337 if (error != 0 || vp->v_op != &newnfs_vnodeops)
338 return (error);
339 np = VTONFS(vp);
340 if (np == NULL)
341 return (0);
342 NFSLOCKNODE(np);
343 if ((np->n_flag & NVNSETSZSKIP) == 0 || (lktype != LK_SHARED &&
344 lktype != LK_EXCLUSIVE && lktype != LK_UPGRADE &&
345 lktype != LK_TRYUPGRADE)) {
346 NFSUNLOCKNODE(np);
347 return (0);
348 }
349 onfault = (ap->a_flags & LK_EATTR_MASK) == LK_NOWAIT &&
350 (ap->a_flags & LK_INIT_MASK) == LK_CANRECURSE &&
351 (lktype == LK_SHARED || lktype == LK_EXCLUSIVE);
352 if (onfault && vp->v_vnlock->lk_recurse == 0) {
353 /*
354 * Force retry in vm_fault(), to make the lock request
355 * sleepable, which allows us to piggy-back the
356 * sleepable call to vnode_pager_setsize().
357 */
358 NFSUNLOCKNODE(np);
359 VOP_UNLOCK(vp);
360 return (EBUSY);
361 }
362 if ((ap->a_flags & LK_NOWAIT) != 0 ||
363 (lktype == LK_SHARED && vp->v_vnlock->lk_recurse > 0)) {
364 NFSUNLOCKNODE(np);
365 return (0);
366 }
367 if (lktype == LK_SHARED) {
368 NFSUNLOCKNODE(np);
369 VOP_UNLOCK(vp);
370 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK);
371 ap->a_flags |= LK_EXCLUSIVE;
372 error = VOP_LOCK1_APV(&default_vnodeops, ap);
373 if (error != 0 || vp->v_op != &newnfs_vnodeops)
374 return (error);
375 if (vp->v_data == NULL)
376 goto downgrade;
377 MPASS(vp->v_data == np);
378 NFSLOCKNODE(np);
379 if ((np->n_flag & NVNSETSZSKIP) == 0) {
380 NFSUNLOCKNODE(np);
381 goto downgrade;
382 }
383 }
384 np->n_flag &= ~NVNSETSZSKIP;
385 nsize = np->n_size;
386 NFSUNLOCKNODE(np);
387 vnode_pager_setsize(vp, nsize);
388 downgrade:
389 if (lktype == LK_SHARED) {
390 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK);
391 ap->a_flags |= LK_DOWNGRADE;
392 (void)VOP_LOCK1_APV(&default_vnodeops, ap);
393 }
394 return (0);
395 }
396
397 static int
nfs34_access_otw(struct vnode * vp,int wmode,struct thread * td,struct ucred * cred,u_int32_t * retmode)398 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td,
399 struct ucred *cred, u_int32_t *retmode)
400 {
401 int error = 0, attrflag, i, lrupos;
402 u_int32_t rmode;
403 struct nfsnode *np = VTONFS(vp);
404 struct nfsvattr nfsva;
405
406 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag,
407 &rmode, NULL);
408 if (attrflag)
409 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
410 if (!error) {
411 lrupos = 0;
412 NFSLOCKNODE(np);
413 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
414 if (np->n_accesscache[i].uid == cred->cr_uid) {
415 np->n_accesscache[i].mode = rmode;
416 np->n_accesscache[i].stamp = time_second;
417 break;
418 }
419 if (i > 0 && np->n_accesscache[i].stamp <
420 np->n_accesscache[lrupos].stamp)
421 lrupos = i;
422 }
423 if (i == NFS_ACCESSCACHESIZE) {
424 np->n_accesscache[lrupos].uid = cred->cr_uid;
425 np->n_accesscache[lrupos].mode = rmode;
426 np->n_accesscache[lrupos].stamp = time_second;
427 }
428 NFSUNLOCKNODE(np);
429 if (retmode != NULL)
430 *retmode = rmode;
431 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0);
432 } else if (NFS_ISV4(vp)) {
433 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
434 }
435 #ifdef KDTRACE_HOOKS
436 if (error != 0)
437 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0,
438 error);
439 #endif
440 return (error);
441 }
442
443 /*
444 * nfs access vnode op.
445 * For nfs version 2, just return ok. File accesses may fail later.
446 * For nfs version 3, use the access rpc to check accessibility. If file modes
447 * are changed on the server, accesses might still fail later.
448 */
449 static int
nfs_access(struct vop_access_args * ap)450 nfs_access(struct vop_access_args *ap)
451 {
452 struct vnode *vp = ap->a_vp;
453 int error = 0, i, gotahit;
454 u_int32_t mode, wmode, rmode;
455 int v34 = NFS_ISV34(vp);
456 struct nfsnode *np = VTONFS(vp);
457
458 /*
459 * Disallow write attempts on filesystems mounted read-only;
460 * unless the file is a socket, fifo, or a block or character
461 * device resident on the filesystem.
462 */
463 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS |
464 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL |
465 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) {
466 switch (vp->v_type) {
467 case VREG:
468 case VDIR:
469 case VLNK:
470 return (EROFS);
471 default:
472 break;
473 }
474 }
475 /*
476 * For nfs v3 or v4, check to see if we have done this recently, and if
477 * so return our cached result instead of making an ACCESS call.
478 * If not, do an access rpc, otherwise you are stuck emulating
479 * ufs_access() locally using the vattr. This may not be correct,
480 * since the server may apply other access criteria such as
481 * client uid-->server uid mapping that we do not know about.
482 */
483 if (v34) {
484 if (ap->a_accmode & VREAD)
485 mode = NFSACCESS_READ;
486 else
487 mode = 0;
488 if (vp->v_type != VDIR) {
489 if (ap->a_accmode & VWRITE)
490 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
491 if (ap->a_accmode & VAPPEND)
492 mode |= NFSACCESS_EXTEND;
493 if (ap->a_accmode & VEXEC)
494 mode |= NFSACCESS_EXECUTE;
495 if (ap->a_accmode & VDELETE)
496 mode |= NFSACCESS_DELETE;
497 } else {
498 if (ap->a_accmode & VWRITE)
499 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
500 if (ap->a_accmode & VAPPEND)
501 mode |= NFSACCESS_EXTEND;
502 if (ap->a_accmode & VEXEC)
503 mode |= NFSACCESS_LOOKUP;
504 if (ap->a_accmode & VDELETE)
505 mode |= NFSACCESS_DELETE;
506 if (ap->a_accmode & VDELETE_CHILD)
507 mode |= NFSACCESS_MODIFY;
508 }
509 /* XXX safety belt, only make blanket request if caching */
510 if (nfsaccess_cache_timeout > 0) {
511 wmode = NFSACCESS_READ | NFSACCESS_MODIFY |
512 NFSACCESS_EXTEND | NFSACCESS_EXECUTE |
513 NFSACCESS_DELETE | NFSACCESS_LOOKUP;
514 } else {
515 wmode = mode;
516 }
517
518 /*
519 * Does our cached result allow us to give a definite yes to
520 * this request?
521 */
522 gotahit = 0;
523 NFSLOCKNODE(np);
524 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
525 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
526 if (time_second < (np->n_accesscache[i].stamp
527 + nfsaccess_cache_timeout) &&
528 (np->n_accesscache[i].mode & mode) == mode) {
529 NFSINCRGLOBAL(nfsstatsv1.accesscache_hits);
530 gotahit = 1;
531 }
532 break;
533 }
534 }
535 NFSUNLOCKNODE(np);
536 #ifdef KDTRACE_HOOKS
537 if (gotahit != 0)
538 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp,
539 ap->a_cred->cr_uid, mode);
540 else
541 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp,
542 ap->a_cred->cr_uid, mode);
543 #endif
544 if (gotahit == 0) {
545 /*
546 * Either a no, or a don't know. Go to the wire.
547 */
548 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses);
549 error = nfs34_access_otw(vp, wmode, ap->a_td,
550 ap->a_cred, &rmode);
551 if (!error &&
552 (rmode & mode) != mode)
553 error = EACCES;
554 }
555 return (error);
556 } else {
557 if ((error = nfsspec_access(ap)) != 0) {
558 return (error);
559 }
560 /*
561 * Attempt to prevent a mapped root from accessing a file
562 * which it shouldn't. We try to read a byte from the file
563 * if the user is root and the file is not zero length.
564 * After calling nfsspec_access, we should have the correct
565 * file size cached.
566 */
567 NFSLOCKNODE(np);
568 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
569 && VTONFS(vp)->n_size > 0) {
570 struct iovec aiov;
571 struct uio auio;
572 char buf[1];
573
574 NFSUNLOCKNODE(np);
575 aiov.iov_base = buf;
576 aiov.iov_len = 1;
577 auio.uio_iov = &aiov;
578 auio.uio_iovcnt = 1;
579 auio.uio_offset = 0;
580 auio.uio_resid = 1;
581 auio.uio_segflg = UIO_SYSSPACE;
582 auio.uio_rw = UIO_READ;
583 auio.uio_td = ap->a_td;
584
585 if (vp->v_type == VREG)
586 error = ncl_readrpc(vp, &auio, ap->a_cred);
587 else if (vp->v_type == VDIR) {
588 char* bp;
589 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
590 aiov.iov_base = bp;
591 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
592 error = ncl_readdirrpc(vp, &auio, ap->a_cred,
593 ap->a_td);
594 free(bp, M_TEMP);
595 } else if (vp->v_type == VLNK)
596 error = ncl_readlinkrpc(vp, &auio, ap->a_cred);
597 else
598 error = EACCES;
599 } else
600 NFSUNLOCKNODE(np);
601 return (error);
602 }
603 }
604
605 /*
606 * nfs open vnode op
607 * Check to see if the type is ok
608 * and that deletion is not in progress.
609 * For paged in text files, you will need to flush the page cache
610 * if consistency is lost.
611 */
612 /* ARGSUSED */
613 static int
nfs_open(struct vop_open_args * ap)614 nfs_open(struct vop_open_args *ap)
615 {
616 struct vnode *vp = ap->a_vp;
617 struct nfsnode *np = VTONFS(vp);
618 struct vattr vattr;
619 int error;
620 int fmode = ap->a_mode;
621 struct ucred *cred;
622 vm_object_t obj;
623
624 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
625 return (EOPNOTSUPP);
626
627 /*
628 * For NFSv4, we need to do the Open Op before cache validation,
629 * so that we conform to RFC3530 Sec. 9.3.1.
630 */
631 if (NFS_ISV4(vp)) {
632 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);
633 if (error) {
634 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
635 (gid_t)0);
636 return (error);
637 }
638 }
639
640 /*
641 * Now, if this Open will be doing reading, re-validate/flush the
642 * cache, so that Close/Open coherency is maintained.
643 */
644 NFSLOCKNODE(np);
645 if (np->n_flag & NMODIFIED) {
646 NFSUNLOCKNODE(np);
647 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
648 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
649 if (VN_IS_DOOMED(vp))
650 return (EBADF);
651 }
652 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
653 if (error == EINTR || error == EIO) {
654 if (NFS_ISV4(vp))
655 (void) nfsrpc_close(vp, 0, ap->a_td);
656 return (error);
657 }
658 NFSLOCKNODE(np);
659 np->n_attrstamp = 0;
660 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
661 if (vp->v_type == VDIR)
662 np->n_direofoffset = 0;
663 NFSUNLOCKNODE(np);
664 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
665 if (error) {
666 if (NFS_ISV4(vp))
667 (void) nfsrpc_close(vp, 0, ap->a_td);
668 return (error);
669 }
670 NFSLOCKNODE(np);
671 np->n_mtime = vattr.va_mtime;
672 if (NFS_ISV4(vp))
673 np->n_change = vattr.va_filerev;
674 } else {
675 NFSUNLOCKNODE(np);
676 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
677 if (error) {
678 if (NFS_ISV4(vp))
679 (void) nfsrpc_close(vp, 0, ap->a_td);
680 return (error);
681 }
682 NFSLOCKNODE(np);
683 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) ||
684 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
685 if (vp->v_type == VDIR)
686 np->n_direofoffset = 0;
687 NFSUNLOCKNODE(np);
688 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
689 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
690 if (VN_IS_DOOMED(vp))
691 return (EBADF);
692 }
693 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
694 if (error == EINTR || error == EIO) {
695 if (NFS_ISV4(vp))
696 (void) nfsrpc_close(vp, 0, ap->a_td);
697 return (error);
698 }
699 NFSLOCKNODE(np);
700 np->n_mtime = vattr.va_mtime;
701 if (NFS_ISV4(vp))
702 np->n_change = vattr.va_filerev;
703 }
704 }
705
706 /*
707 * If the object has >= 1 O_DIRECT active opens, we disable caching.
708 */
709 if (newnfs_directio_enable && (fmode & O_DIRECT) &&
710 (vp->v_type == VREG)) {
711 if (np->n_directio_opens == 0) {
712 NFSUNLOCKNODE(np);
713 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
714 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
715 if (VN_IS_DOOMED(vp))
716 return (EBADF);
717 }
718 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
719 if (error) {
720 if (NFS_ISV4(vp))
721 (void) nfsrpc_close(vp, 0, ap->a_td);
722 return (error);
723 }
724 NFSLOCKNODE(np);
725 np->n_flag |= NNONCACHE;
726 }
727 np->n_directio_opens++;
728 }
729
730 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */
731 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0)
732 np->n_flag |= NWRITEOPENED;
733
734 /*
735 * If this is an open for writing, capture a reference to the
736 * credentials, so they can be used by ncl_putpages(). Using
737 * these write credentials is preferable to the credentials of
738 * whatever thread happens to be doing the VOP_PUTPAGES() since
739 * the write RPCs are less likely to fail with EACCES.
740 */
741 if ((fmode & FWRITE) != 0) {
742 cred = np->n_writecred;
743 np->n_writecred = crhold(ap->a_cred);
744 } else
745 cred = NULL;
746 NFSUNLOCKNODE(np);
747
748 if (cred != NULL)
749 crfree(cred);
750 vnode_create_vobject(vp, vattr.va_size, ap->a_td);
751
752 /*
753 * If the text file has been mmap'd, flush any dirty pages to the
754 * buffer cache and then...
755 * Make sure all writes are pushed to the NFS server. If this is not
756 * done, the modify time of the file can change while the text
757 * file is being executed. This will cause the process that is
758 * executing the text file to be terminated.
759 */
760 if (vp->v_writecount <= -1) {
761 if ((obj = vp->v_object) != NULL &&
762 vm_object_mightbedirty(obj)) {
763 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
764 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
765 if (VN_IS_DOOMED(vp))
766 return (EBADF);
767 }
768 vnode_pager_clean_sync(vp);
769 }
770
771 /* Now, flush the buffer cache. */
772 ncl_flush(vp, MNT_WAIT, curthread, 0, 0);
773
774 /* And, finally, make sure that n_mtime is up to date. */
775 np = VTONFS(vp);
776 NFSLOCKNODE(np);
777 np->n_mtime = np->n_vattr.na_mtime;
778 NFSUNLOCKNODE(np);
779 }
780 return (0);
781 }
782
783 /*
784 * nfs close vnode op
785 * What an NFS client should do upon close after writing is a debatable issue.
786 * Most NFS clients push delayed writes to the server upon close, basically for
787 * two reasons:
788 * 1 - So that any write errors may be reported back to the client process
789 * doing the close system call. By far the two most likely errors are
790 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
791 * 2 - To put a worst case upper bound on cache inconsistency between
792 * multiple clients for the file.
793 * There is also a consistency problem for Version 2 of the protocol w.r.t.
794 * not being able to tell if other clients are writing a file concurrently,
795 * since there is no way of knowing if the changed modify time in the reply
796 * is only due to the write for this client.
797 * (NFS Version 3 provides weak cache consistency data in the reply that
798 * should be sufficient to detect and handle this case.)
799 *
800 * The current code does the following:
801 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
802 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
803 * or commit them (this satisfies 1 and 2 except for the
804 * case where the server crashes after this close but
805 * before the commit RPC, which is felt to be "good
806 * enough". Changing the last argument to ncl_flush() to
807 * a 1 would force a commit operation, if it is felt a
808 * commit is necessary now.
809 * for NFS Version 4 - flush the dirty buffers and commit them, if
810 * nfscl_mustflush() says this is necessary.
811 * It is necessary if there is no write delegation held,
812 * in order to satisfy open/close coherency.
813 * If the file isn't cached on local stable storage,
814 * it may be necessary in order to detect "out of space"
815 * errors from the server, if the write delegation
816 * issued by the server doesn't allow the file to grow.
817 */
818 /* ARGSUSED */
819 static int
nfs_close(struct vop_close_args * ap)820 nfs_close(struct vop_close_args *ap)
821 {
822 struct vnode *vp = ap->a_vp;
823 struct nfsnode *np = VTONFS(vp);
824 struct nfsvattr nfsva;
825 struct ucred *cred;
826 int error = 0, ret, localcred = 0;
827 int fmode = ap->a_fflag;
828
829 if (NFSCL_FORCEDISM(vp->v_mount))
830 return (0);
831 /*
832 * During shutdown, a_cred isn't valid, so just use root.
833 */
834 if (ap->a_cred == NOCRED) {
835 cred = newnfs_getcred();
836 localcred = 1;
837 } else {
838 cred = ap->a_cred;
839 }
840 if (vp->v_type == VREG) {
841 /*
842 * Examine and clean dirty pages, regardless of NMODIFIED.
843 * This closes a major hole in close-to-open consistency.
844 * We want to push out all dirty pages (and buffers) on
845 * close, regardless of whether they were dirtied by
846 * mmap'ed writes or via write().
847 */
848 if (nfs_clean_pages_on_close && vp->v_object) {
849 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
850 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
851 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK)
852 return (EBADF);
853 }
854 vnode_pager_clean_async(vp);
855 }
856 NFSLOCKNODE(np);
857 if (np->n_flag & NMODIFIED) {
858 NFSUNLOCKNODE(np);
859 if (NFS_ISV3(vp)) {
860 /*
861 * Under NFSv3 we have dirty buffers to dispose of. We
862 * must flush them to the NFS server. We have the option
863 * of waiting all the way through the commit rpc or just
864 * waiting for the initial write. The default is to only
865 * wait through the initial write so the data is in the
866 * server's cache, which is roughly similar to the state
867 * a standard disk subsystem leaves the file in on close().
868 *
869 * We cannot clear the NMODIFIED bit in np->n_flag due to
870 * potential races with other processes, and certainly
871 * cannot clear it if we don't commit.
872 * These races occur when there is no longer the old
873 * traditional vnode locking implemented for Vnode Ops.
874 */
875 int cm = newnfs_commit_on_close ? 1 : 0;
876 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
877 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
878 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK)
879 return (EBADF);
880 }
881 error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0);
882 /* np->n_flag &= ~NMODIFIED; */
883 } else if (NFS_ISV4(vp)) {
884 if (nfscl_mustflush(vp) != 0) {
885 int cm = newnfs_commit_on_close ? 1 : 0;
886 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
887 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
888 if (VN_IS_DOOMED(vp) && ap->a_fflag !=
889 FNONBLOCK)
890 return (EBADF);
891 }
892 error = ncl_flush(vp, MNT_WAIT, ap->a_td,
893 cm, 0);
894 /*
895 * as above w.r.t races when clearing
896 * NMODIFIED.
897 * np->n_flag &= ~NMODIFIED;
898 */
899 }
900 } else {
901 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
902 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
903 if (VN_IS_DOOMED(vp) && ap->a_fflag !=
904 FNONBLOCK)
905 return (EBADF);
906 }
907 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
908 }
909 NFSLOCKNODE(np);
910 }
911 /*
912 * Invalidate the attribute cache in all cases.
913 * An open is going to fetch fresh attrs any way, other procs
914 * on this node that have file open will be forced to do an
915 * otw attr fetch, but this is safe.
916 * --> A user found that their RPC count dropped by 20% when
917 * this was commented out and I can't see any requirement
918 * for it, so I've disabled it when negative lookups are
919 * enabled. (What does this have to do with negative lookup
920 * caching? Well nothing, except it was reported by the
921 * same user that needed negative lookup caching and I wanted
922 * there to be a way to disable it to see if it
923 * is the cause of some caching/coherency issue that might
924 * crop up.)
925 */
926 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) {
927 np->n_attrstamp = 0;
928 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
929 }
930 if (np->n_flag & NWRITEERR) {
931 np->n_flag &= ~NWRITEERR;
932 error = np->n_error;
933 }
934 NFSUNLOCKNODE(np);
935 }
936
937 if (NFS_ISV4(vp)) {
938 /*
939 * Get attributes so "change" is up to date.
940 */
941 if (error == 0 && nfscl_mustflush(vp) != 0 &&
942 vp->v_type == VREG &&
943 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) {
944 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
945 NULL);
946 if (!ret) {
947 np->n_change = nfsva.na_filerev;
948 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
949 NULL, 0, 0);
950 }
951 }
952
953 /*
954 * and do the close.
955 */
956 ret = nfsrpc_close(vp, 0, ap->a_td);
957 if (!error && ret)
958 error = ret;
959 if (error)
960 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
961 (gid_t)0);
962 }
963 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
964 NFSLOCKNODE(np);
965 KASSERT((np->n_directio_opens > 0),
966 ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
967 np->n_directio_opens--;
968 if (np->n_directio_opens == 0)
969 np->n_flag &= ~NNONCACHE;
970 NFSUNLOCKNODE(np);
971 }
972 if (localcred)
973 NFSFREECRED(cred);
974 return (error);
975 }
976
977 /*
978 * nfs getattr call from vfs.
979 */
980 static int
nfs_getattr(struct vop_getattr_args * ap)981 nfs_getattr(struct vop_getattr_args *ap)
982 {
983 struct vnode *vp = ap->a_vp;
984 struct thread *td = curthread; /* XXX */
985 struct nfsnode *np = VTONFS(vp);
986 int error = 0;
987 struct nfsvattr nfsva;
988 struct vattr *vap = ap->a_vap;
989 struct vattr vattr;
990 struct nfsmount *nmp;
991
992 nmp = VFSTONFS(vp->v_mount);
993 /*
994 * Update local times for special files.
995 */
996 NFSLOCKNODE(np);
997 if (np->n_flag & (NACC | NUPD))
998 np->n_flag |= NCHG;
999 NFSUNLOCKNODE(np);
1000 /*
1001 * First look in the cache.
1002 * For "syskrb5" mounts, nm_fhsize might still be zero and
1003 * cached attributes should be ignored.
1004 */
1005 if (nmp->nm_fhsize > 0 && ncl_getattrcache(vp, &vattr) == 0) {
1006 ncl_copy_vattr(vap, &vattr);
1007
1008 /*
1009 * Get the local modify time for the case of a write
1010 * delegation.
1011 */
1012 nfscl_deleggetmodtime(vp, &vap->va_mtime);
1013 return (0);
1014 }
1015
1016 if (NFS_ISV34(vp) && nfs_prime_access_cache &&
1017 nfsaccess_cache_timeout > 0) {
1018 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses);
1019 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
1020 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
1021 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
1022 return (0);
1023 }
1024 }
1025 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
1026 if (!error)
1027 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0);
1028 if (!error) {
1029 /*
1030 * Get the local modify time for the case of a write
1031 * delegation.
1032 */
1033 nfscl_deleggetmodtime(vp, &vap->va_mtime);
1034 } else if (NFS_ISV4(vp)) {
1035 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1036 }
1037 return (error);
1038 }
1039
1040 /*
1041 * nfs setattr call.
1042 */
1043 static int
nfs_setattr(struct vop_setattr_args * ap)1044 nfs_setattr(struct vop_setattr_args *ap)
1045 {
1046 struct vnode *vp = ap->a_vp;
1047 struct nfsnode *np = VTONFS(vp);
1048 struct thread *td = curthread; /* XXX */
1049 struct vattr *vap = ap->a_vap;
1050 int error = 0;
1051 u_quad_t tsize;
1052 struct timespec ts;
1053
1054 #ifndef nolint
1055 tsize = (u_quad_t)0;
1056 #endif
1057
1058 /*
1059 * Setting of flags and marking of atimes are not supported.
1060 */
1061 if (vap->va_flags != VNOVAL)
1062 return (EOPNOTSUPP);
1063
1064 /*
1065 * Disallow write attempts if the filesystem is mounted read-only.
1066 */
1067 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
1068 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
1069 vap->va_mtime.tv_sec != VNOVAL ||
1070 vap->va_birthtime.tv_sec != VNOVAL ||
1071 vap->va_mode != (mode_t)VNOVAL) &&
1072 (vp->v_mount->mnt_flag & MNT_RDONLY))
1073 return (EROFS);
1074 if (vap->va_size != VNOVAL) {
1075 switch (vp->v_type) {
1076 case VDIR:
1077 return (EISDIR);
1078 case VCHR:
1079 case VBLK:
1080 case VSOCK:
1081 case VFIFO:
1082 if (vap->va_mtime.tv_sec == VNOVAL &&
1083 vap->va_atime.tv_sec == VNOVAL &&
1084 vap->va_birthtime.tv_sec == VNOVAL &&
1085 vap->va_mode == (mode_t)VNOVAL &&
1086 vap->va_uid == (uid_t)VNOVAL &&
1087 vap->va_gid == (gid_t)VNOVAL)
1088 return (0);
1089 vap->va_size = VNOVAL;
1090 break;
1091 default:
1092 /*
1093 * Disallow write attempts if the filesystem is
1094 * mounted read-only.
1095 */
1096 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1097 return (EROFS);
1098 /*
1099 * We run vnode_pager_setsize() early (why?),
1100 * we must set np->n_size now to avoid vinvalbuf
1101 * V_SAVE races that might setsize a lower
1102 * value.
1103 */
1104 NFSLOCKNODE(np);
1105 tsize = np->n_size;
1106 NFSUNLOCKNODE(np);
1107 error = ncl_meta_setsize(vp, td, vap->va_size);
1108 NFSLOCKNODE(np);
1109 if (np->n_flag & NMODIFIED) {
1110 tsize = np->n_size;
1111 NFSUNLOCKNODE(np);
1112 error = ncl_vinvalbuf(vp, vap->va_size == 0 ?
1113 0 : V_SAVE, td, 1);
1114 if (error != 0) {
1115 vnode_pager_setsize(vp, tsize);
1116 return (error);
1117 }
1118 /*
1119 * Call nfscl_delegmodtime() to set the modify time
1120 * locally, as required.
1121 */
1122 nfscl_delegmodtime(vp, NULL);
1123 } else
1124 NFSUNLOCKNODE(np);
1125 /*
1126 * np->n_size has already been set to vap->va_size
1127 * in ncl_meta_setsize(). We must set it again since
1128 * nfs_loadattrcache() could be called through
1129 * ncl_meta_setsize() and could modify np->n_size.
1130 */
1131 NFSLOCKNODE(np);
1132 np->n_vattr.na_size = np->n_size = vap->va_size;
1133 NFSUNLOCKNODE(np);
1134 }
1135 } else {
1136 NFSLOCKNODE(np);
1137 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) &&
1138 (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
1139 NFSUNLOCKNODE(np);
1140 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
1141 if (error == EINTR || error == EIO)
1142 return (error);
1143 } else
1144 NFSUNLOCKNODE(np);
1145 }
1146 error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
1147 if (vap->va_size != VNOVAL) {
1148 if (error == 0) {
1149 nanouptime(&ts);
1150 NFSLOCKNODE(np);
1151 np->n_localmodtime = ts;
1152 NFSUNLOCKNODE(np);
1153 } else {
1154 NFSLOCKNODE(np);
1155 np->n_size = np->n_vattr.na_size = tsize;
1156 vnode_pager_setsize(vp, tsize);
1157 NFSUNLOCKNODE(np);
1158 }
1159 }
1160 if (vap->va_mtime.tv_sec != VNOVAL && error == 0)
1161 nfscl_delegmodtime(vp, &vap->va_mtime);
1162 return (error);
1163 }
1164
1165 /*
1166 * Do an nfs setattr rpc.
1167 */
1168 static int
nfs_setattrrpc(struct vnode * vp,struct vattr * vap,struct ucred * cred,struct thread * td)1169 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
1170 struct thread *td)
1171 {
1172 struct nfsnode *np = VTONFS(vp);
1173 int error, ret, attrflag, i;
1174 struct nfsvattr nfsva;
1175
1176 if (NFS_ISV34(vp)) {
1177 NFSLOCKNODE(np);
1178 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
1179 np->n_accesscache[i].stamp = 0;
1180 np->n_flag |= NDELEGMOD;
1181 NFSUNLOCKNODE(np);
1182 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
1183 }
1184 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
1185 NULL);
1186 if (attrflag) {
1187 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1188 if (ret && !error)
1189 error = ret;
1190 }
1191 if (error && NFS_ISV4(vp))
1192 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
1193 return (error);
1194 }
1195
1196 /*
1197 * nfs lookup call, one step at a time...
1198 * First look in cache
1199 * If not found, unlock the directory nfsnode and do the rpc
1200 */
1201 static int
nfs_lookup(struct vop_lookup_args * ap)1202 nfs_lookup(struct vop_lookup_args *ap)
1203 {
1204 struct componentname *cnp = ap->a_cnp;
1205 struct vnode *dvp = ap->a_dvp;
1206 struct vnode **vpp = ap->a_vpp;
1207 struct mount *mp = dvp->v_mount;
1208 int flags = cnp->cn_flags;
1209 struct vnode *newvp;
1210 struct nfsmount *nmp;
1211 struct nfsnode *np, *newnp;
1212 int error = 0, attrflag, dattrflag, ltype, ncticks;
1213 struct thread *td = cnp->cn_thread;
1214 struct nfsfh *nfhp;
1215 struct nfsvattr dnfsva, nfsva;
1216 struct vattr vattr;
1217 struct timespec nctime, ts;
1218
1219 *vpp = NULLVP;
1220 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
1221 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
1222 return (EROFS);
1223 if (dvp->v_type != VDIR)
1224 return (ENOTDIR);
1225 nmp = VFSTONFS(mp);
1226 np = VTONFS(dvp);
1227
1228 /* For NFSv4, wait until any remove is done. */
1229 NFSLOCKNODE(np);
1230 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
1231 np->n_flag |= NREMOVEWANT;
1232 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
1233 }
1234 NFSUNLOCKNODE(np);
1235
1236 error = vn_dir_check_exec(dvp, cnp);
1237 if (error != 0)
1238 return (error);
1239 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks);
1240 if (error > 0 && error != ENOENT)
1241 return (error);
1242 if (error == -1) {
1243 /*
1244 * Lookups of "." are special and always return the
1245 * current directory. cache_lookup() already handles
1246 * associated locking bookkeeping, etc.
1247 */
1248 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
1249 /* XXX: Is this really correct? */
1250 if (cnp->cn_nameiop != LOOKUP &&
1251 (flags & ISLASTCN))
1252 cnp->cn_flags |= SAVENAME;
1253 return (0);
1254 }
1255
1256 /*
1257 * We only accept a positive hit in the cache if the
1258 * change time of the file matches our cached copy.
1259 * Otherwise, we discard the cache entry and fallback
1260 * to doing a lookup RPC. We also only trust cache
1261 * entries for less than nm_nametimeo seconds.
1262 *
1263 * To better handle stale file handles and attributes,
1264 * clear the attribute cache of this node if it is a
1265 * leaf component, part of an open() call, and not
1266 * locally modified before fetching the attributes.
1267 * This should allow stale file handles to be detected
1268 * here where we can fall back to a LOOKUP RPC to
1269 * recover rather than having nfs_open() detect the
1270 * stale file handle and failing open(2) with ESTALE.
1271 */
1272 newvp = *vpp;
1273 newnp = VTONFS(newvp);
1274 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
1275 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1276 !(newnp->n_flag & NMODIFIED)) {
1277 NFSLOCKNODE(newnp);
1278 newnp->n_attrstamp = 0;
1279 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1280 NFSUNLOCKNODE(newnp);
1281 }
1282 if (nfscl_nodeleg(newvp, 0) == 0 ||
1283 ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
1284 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
1285 timespeccmp(&vattr.va_ctime, &nctime, ==))) {
1286 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits);
1287 if (cnp->cn_nameiop != LOOKUP &&
1288 (flags & ISLASTCN))
1289 cnp->cn_flags |= SAVENAME;
1290 return (0);
1291 }
1292 cache_purge(newvp);
1293 if (dvp != newvp)
1294 vput(newvp);
1295 else
1296 vrele(newvp);
1297 *vpp = NULLVP;
1298 } else if (error == ENOENT) {
1299 if (VN_IS_DOOMED(dvp))
1300 return (ENOENT);
1301 /*
1302 * We only accept a negative hit in the cache if the
1303 * modification time of the parent directory matches
1304 * the cached copy in the name cache entry.
1305 * Otherwise, we discard all of the negative cache
1306 * entries for this directory. We also only trust
1307 * negative cache entries for up to nm_negnametimeo
1308 * seconds.
1309 */
1310 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
1311 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
1312 timespeccmp(&vattr.va_mtime, &nctime, ==)) {
1313 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits);
1314 return (ENOENT);
1315 }
1316 cache_purge_negative(dvp);
1317 }
1318
1319 newvp = NULLVP;
1320 NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses);
1321 nanouptime(&ts);
1322 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1323 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1324 NULL);
1325 if (dattrflag)
1326 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1327 if (error) {
1328 if (newvp != NULLVP) {
1329 vput(newvp);
1330 *vpp = NULLVP;
1331 }
1332
1333 if (error != ENOENT) {
1334 if (NFS_ISV4(dvp))
1335 error = nfscl_maperr(td, error, (uid_t)0,
1336 (gid_t)0);
1337 return (error);
1338 }
1339
1340 /* The requested file was not found. */
1341 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
1342 (flags & ISLASTCN)) {
1343 /*
1344 * XXX: UFS does a full VOP_ACCESS(dvp,
1345 * VWRITE) here instead of just checking
1346 * MNT_RDONLY.
1347 */
1348 if (mp->mnt_flag & MNT_RDONLY)
1349 return (EROFS);
1350 cnp->cn_flags |= SAVENAME;
1351 return (EJUSTRETURN);
1352 }
1353
1354 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) {
1355 /*
1356 * Cache the modification time of the parent
1357 * directory from the post-op attributes in
1358 * the name cache entry. The negative cache
1359 * entry will be ignored once the directory
1360 * has changed. Don't bother adding the entry
1361 * if the directory has already changed.
1362 */
1363 NFSLOCKNODE(np);
1364 if (timespeccmp(&np->n_vattr.na_mtime,
1365 &dnfsva.na_mtime, ==)) {
1366 NFSUNLOCKNODE(np);
1367 cache_enter_time(dvp, NULL, cnp,
1368 &dnfsva.na_mtime, NULL);
1369 } else
1370 NFSUNLOCKNODE(np);
1371 }
1372 return (ENOENT);
1373 }
1374
1375 /*
1376 * Handle RENAME case...
1377 */
1378 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
1379 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1380 free(nfhp, M_NFSFH);
1381 return (EISDIR);
1382 }
1383 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1384 LK_EXCLUSIVE);
1385 if (error)
1386 return (error);
1387 newvp = NFSTOV(np);
1388 /*
1389 * If n_localmodtime >= time before RPC, then
1390 * a file modification operation, such as
1391 * VOP_SETATTR() of size, has occurred while
1392 * the Lookup RPC and acquisition of the vnode
1393 * happened. As such, the attributes might
1394 * be stale, with possibly an incorrect size.
1395 */
1396 NFSLOCKNODE(np);
1397 if (timespecisset(&np->n_localmodtime) &&
1398 timespeccmp(&np->n_localmodtime, &ts, >=)) {
1399 NFSCL_DEBUG(4, "nfs_lookup: rename localmod "
1400 "stale attributes\n");
1401 attrflag = 0;
1402 }
1403 NFSUNLOCKNODE(np);
1404 if (attrflag)
1405 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1406 0, 1);
1407 *vpp = newvp;
1408 cnp->cn_flags |= SAVENAME;
1409 return (0);
1410 }
1411
1412 if (flags & ISDOTDOT) {
1413 ltype = NFSVOPISLOCKED(dvp);
1414 error = vfs_busy(mp, MBF_NOWAIT);
1415 if (error != 0) {
1416 vfs_ref(mp);
1417 NFSVOPUNLOCK(dvp);
1418 error = vfs_busy(mp, 0);
1419 NFSVOPLOCK(dvp, ltype | LK_RETRY);
1420 vfs_rel(mp);
1421 if (error == 0 && VN_IS_DOOMED(dvp)) {
1422 vfs_unbusy(mp);
1423 error = ENOENT;
1424 }
1425 if (error != 0)
1426 return (error);
1427 }
1428 NFSVOPUNLOCK(dvp);
1429 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1430 cnp->cn_lkflags);
1431 if (error == 0)
1432 newvp = NFSTOV(np);
1433 vfs_unbusy(mp);
1434 if (newvp != dvp)
1435 NFSVOPLOCK(dvp, ltype | LK_RETRY);
1436 if (VN_IS_DOOMED(dvp)) {
1437 if (error == 0) {
1438 if (newvp == dvp)
1439 vrele(newvp);
1440 else
1441 vput(newvp);
1442 }
1443 error = ENOENT;
1444 }
1445 if (error != 0)
1446 return (error);
1447 if (attrflag)
1448 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1449 0, 1);
1450 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1451 free(nfhp, M_NFSFH);
1452 VREF(dvp);
1453 newvp = dvp;
1454 if (attrflag)
1455 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1456 0, 1);
1457 } else {
1458 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1459 cnp->cn_lkflags);
1460 if (error)
1461 return (error);
1462 newvp = NFSTOV(np);
1463 /*
1464 * If n_localmodtime >= time before RPC, then
1465 * a file modification operation, such as
1466 * VOP_SETATTR() of size, has occurred while
1467 * the Lookup RPC and acquisition of the vnode
1468 * happened. As such, the attributes might
1469 * be stale, with possibly an incorrect size.
1470 */
1471 NFSLOCKNODE(np);
1472 if (timespecisset(&np->n_localmodtime) &&
1473 timespeccmp(&np->n_localmodtime, &ts, >=)) {
1474 NFSCL_DEBUG(4, "nfs_lookup: localmod "
1475 "stale attributes\n");
1476 attrflag = 0;
1477 }
1478 NFSUNLOCKNODE(np);
1479 if (attrflag)
1480 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1481 0, 1);
1482 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1483 !(np->n_flag & NMODIFIED)) {
1484 /*
1485 * Flush the attribute cache when opening a
1486 * leaf node to ensure that fresh attributes
1487 * are fetched in nfs_open() since we did not
1488 * fetch attributes from the LOOKUP reply.
1489 */
1490 NFSLOCKNODE(np);
1491 np->n_attrstamp = 0;
1492 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1493 NFSUNLOCKNODE(np);
1494 }
1495 }
1496 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
1497 cnp->cn_flags |= SAVENAME;
1498 if ((cnp->cn_flags & MAKEENTRY) && dvp != newvp &&
1499 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
1500 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
1501 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
1502 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime);
1503 *vpp = newvp;
1504 return (0);
1505 }
1506
1507 /*
1508 * nfs read call.
1509 * Just call ncl_bioread() to do the work.
1510 */
1511 static int
nfs_read(struct vop_read_args * ap)1512 nfs_read(struct vop_read_args *ap)
1513 {
1514 struct vnode *vp = ap->a_vp;
1515
1516 switch (vp->v_type) {
1517 case VREG:
1518 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
1519 case VDIR:
1520 return (EISDIR);
1521 default:
1522 return (EOPNOTSUPP);
1523 }
1524 }
1525
1526 /*
1527 * nfs readlink call
1528 */
1529 static int
nfs_readlink(struct vop_readlink_args * ap)1530 nfs_readlink(struct vop_readlink_args *ap)
1531 {
1532 struct vnode *vp = ap->a_vp;
1533
1534 if (vp->v_type != VLNK)
1535 return (EINVAL);
1536 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
1537 }
1538
1539 /*
1540 * Do a readlink rpc.
1541 * Called by ncl_doio() from below the buffer cache.
1542 */
1543 int
ncl_readlinkrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred)1544 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1545 {
1546 int error, ret, attrflag;
1547 struct nfsvattr nfsva;
1548
1549 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
1550 &attrflag, NULL);
1551 if (attrflag) {
1552 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1553 if (ret && !error)
1554 error = ret;
1555 }
1556 if (error && NFS_ISV4(vp))
1557 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1558 return (error);
1559 }
1560
1561 /*
1562 * nfs read rpc call
1563 * Ditto above
1564 */
1565 int
ncl_readrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred)1566 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1567 {
1568 int error, ret, attrflag;
1569 struct nfsvattr nfsva;
1570 struct nfsmount *nmp;
1571
1572 nmp = VFSTONFS(vp->v_mount);
1573 error = EIO;
1574 attrflag = 0;
1575 if (NFSHASPNFS(nmp))
1576 error = nfscl_doiods(vp, uiop, NULL, NULL,
1577 NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td);
1578 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error);
1579 if (error != 0 && error != EFAULT)
1580 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva,
1581 &attrflag, NULL);
1582 if (attrflag) {
1583 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1584 if (ret && !error)
1585 error = ret;
1586 }
1587 if (error && NFS_ISV4(vp))
1588 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1589 return (error);
1590 }
1591
1592 /*
1593 * nfs write call
1594 */
1595 int
ncl_writerpc(struct vnode * vp,struct uio * uiop,struct ucred * cred,int * iomode,int * must_commit,int called_from_strategy,int ioflag)1596 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
1597 int *iomode, int *must_commit, int called_from_strategy, int ioflag)
1598 {
1599 struct nfsvattr nfsva;
1600 int error, attrflag, ret;
1601 struct nfsmount *nmp;
1602
1603 nmp = VFSTONFS(vp->v_mount);
1604 error = EIO;
1605 attrflag = 0;
1606 if (NFSHASPNFS(nmp))
1607 error = nfscl_doiods(vp, uiop, iomode, must_commit,
1608 NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td);
1609 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error);
1610 if (error != 0 && error != EFAULT)
1611 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
1612 uiop->uio_td, &nfsva, &attrflag, called_from_strategy,
1613 ioflag);
1614 if (attrflag) {
1615 if (VTONFS(vp)->n_flag & ND_NFSV4)
1616 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1,
1617 1);
1618 else
1619 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
1620 1);
1621 if (ret && !error)
1622 error = ret;
1623 }
1624 if (DOINGASYNC(vp))
1625 *iomode = NFSWRITE_FILESYNC;
1626 if (error && NFS_ISV4(vp))
1627 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1628 return (error);
1629 }
1630
1631 /*
1632 * nfs mknod rpc
1633 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
1634 * mode set to specify the file type and the size field for rdev.
1635 */
1636 static int
nfs_mknodrpc(struct vnode * dvp,struct vnode ** vpp,struct componentname * cnp,struct vattr * vap)1637 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
1638 struct vattr *vap)
1639 {
1640 struct nfsvattr nfsva, dnfsva;
1641 struct vnode *newvp = NULL;
1642 struct nfsnode *np = NULL, *dnp;
1643 struct nfsfh *nfhp;
1644 struct vattr vattr;
1645 int error = 0, attrflag, dattrflag;
1646 u_int32_t rdev;
1647
1648 if (vap->va_type == VCHR || vap->va_type == VBLK)
1649 rdev = vap->va_rdev;
1650 else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
1651 rdev = 0xffffffff;
1652 else
1653 return (EOPNOTSUPP);
1654 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1655 return (error);
1656 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
1657 rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva,
1658 &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
1659 if (!error) {
1660 if (!nfhp)
1661 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1662 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
1663 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1664 NULL);
1665 if (nfhp)
1666 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1667 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
1668 }
1669 if (dattrflag)
1670 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1671 if (!error) {
1672 newvp = NFSTOV(np);
1673 if (attrflag != 0) {
1674 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1675 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(cnp->cn_thread, 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, cnp->cn_thread, &dnfsva, &nfsva,
1774 &nfhp, &attrflag, &dattrflag, NULL);
1775 if (!error) {
1776 if (nfhp == NULL)
1777 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1778 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
1779 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1780 NULL);
1781 if (nfhp != NULL)
1782 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1783 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
1784 }
1785 if (dattrflag)
1786 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1787 if (!error) {
1788 newvp = NFSTOV(np);
1789 if (attrflag == 0)
1790 error = nfsrpc_getattr(newvp, cnp->cn_cred,
1791 cnp->cn_thread, &nfsva, NULL);
1792 if (error == 0)
1793 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1794 0, 1);
1795 }
1796 if (error) {
1797 if (newvp != NULL) {
1798 vput(newvp);
1799 newvp = NULL;
1800 }
1801 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
1802 error == NFSERR_NOTSUPP) {
1803 fmode &= ~O_EXCL;
1804 goto again;
1805 }
1806 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
1807 if (nfscl_checksattr(vap, &nfsva)) {
1808 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
1809 cnp->cn_thread, &nfsva, &attrflag, NULL);
1810 if (error && (vap->va_uid != (uid_t)VNOVAL ||
1811 vap->va_gid != (gid_t)VNOVAL)) {
1812 /* try again without setting uid/gid */
1813 vap->va_uid = (uid_t)VNOVAL;
1814 vap->va_gid = (uid_t)VNOVAL;
1815 error = nfsrpc_setattr(newvp, vap, NULL,
1816 cnp->cn_cred, cnp->cn_thread, &nfsva,
1817 &attrflag, NULL);
1818 }
1819 if (attrflag)
1820 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
1821 NULL, 0, 1);
1822 if (error != 0)
1823 vput(newvp);
1824 }
1825 }
1826 if (!error) {
1827 if ((cnp->cn_flags & MAKEENTRY) && attrflag) {
1828 if (dvp != newvp)
1829 cache_enter_time(dvp, newvp, cnp,
1830 &nfsva.na_ctime, NULL);
1831 else
1832 printf("nfs_create: bogus NFS server returned "
1833 "the directory as the new file object\n");
1834 }
1835 *ap->a_vpp = newvp;
1836 } else if (NFS_ISV4(dvp)) {
1837 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
1838 vap->va_gid);
1839 }
1840 NFSLOCKNODE(dnp);
1841 dnp->n_flag |= NMODIFIED;
1842 if (!dattrflag) {
1843 dnp->n_attrstamp = 0;
1844 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1845 }
1846 NFSUNLOCKNODE(dnp);
1847 return (error);
1848 }
1849
1850 /*
1851 * nfs file remove call
1852 * To try and make nfs semantics closer to ufs semantics, a file that has
1853 * other processes using the vnode is renamed instead of removed and then
1854 * removed later on the last close.
1855 * - If v_usecount > 1
1856 * If a rename is not already in the works
1857 * call nfs_sillyrename() to set it up
1858 * else
1859 * do the remove rpc
1860 */
1861 static int
nfs_remove(struct vop_remove_args * ap)1862 nfs_remove(struct vop_remove_args *ap)
1863 {
1864 struct vnode *vp = ap->a_vp;
1865 struct vnode *dvp = ap->a_dvp;
1866 struct componentname *cnp = ap->a_cnp;
1867 struct nfsnode *np = VTONFS(vp);
1868 int error = 0;
1869 struct vattr vattr;
1870
1871 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
1872 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
1873 if (vp->v_type == VDIR)
1874 error = EPERM;
1875 else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
1876 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
1877 vattr.va_nlink > 1)) {
1878 /*
1879 * Purge the name cache so that the chance of a lookup for
1880 * the name succeeding while the remove is in progress is
1881 * minimized. Without node locking it can still happen, such
1882 * that an I/O op returns ESTALE, but since you get this if
1883 * another host removes the file..
1884 */
1885 cache_purge(vp);
1886 /*
1887 * throw away biocache buffers, mainly to avoid
1888 * unnecessary delayed writes later.
1889 */
1890 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1);
1891 if (error != EINTR && error != EIO)
1892 /* Do the rpc */
1893 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
1894 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
1895 /*
1896 * Kludge City: If the first reply to the remove rpc is lost..
1897 * the reply to the retransmitted request will be ENOENT
1898 * since the file was in fact removed
1899 * Therefore, we cheat and return success.
1900 */
1901 if (error == ENOENT)
1902 error = 0;
1903 } else if (!np->n_sillyrename)
1904 error = nfs_sillyrename(dvp, vp, cnp);
1905 NFSLOCKNODE(np);
1906 np->n_attrstamp = 0;
1907 NFSUNLOCKNODE(np);
1908 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1909 return (error);
1910 }
1911
1912 /*
1913 * nfs file remove rpc called from nfs_inactive
1914 */
1915 int
ncl_removeit(struct sillyrename * sp,struct vnode * vp)1916 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
1917 {
1918 /*
1919 * Make sure that the directory vnode is still valid.
1920 * XXX we should lock sp->s_dvp here.
1921 */
1922 if (sp->s_dvp->v_type == VBAD)
1923 return (0);
1924 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
1925 sp->s_cred, NULL));
1926 }
1927
1928 /*
1929 * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
1930 */
1931 static int
nfs_removerpc(struct vnode * dvp,struct vnode * vp,char * name,int namelen,struct ucred * cred,struct thread * td)1932 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
1933 int namelen, struct ucred *cred, struct thread *td)
1934 {
1935 struct nfsvattr dnfsva;
1936 struct nfsnode *dnp = VTONFS(dvp);
1937 int error = 0, dattrflag;
1938
1939 NFSLOCKNODE(dnp);
1940 dnp->n_flag |= NREMOVEINPROG;
1941 NFSUNLOCKNODE(dnp);
1942 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
1943 &dattrflag, NULL);
1944 NFSLOCKNODE(dnp);
1945 if ((dnp->n_flag & NREMOVEWANT)) {
1946 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
1947 NFSUNLOCKNODE(dnp);
1948 wakeup((caddr_t)dnp);
1949 } else {
1950 dnp->n_flag &= ~NREMOVEINPROG;
1951 NFSUNLOCKNODE(dnp);
1952 }
1953 if (dattrflag)
1954 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1955 NFSLOCKNODE(dnp);
1956 dnp->n_flag |= NMODIFIED;
1957 if (!dattrflag) {
1958 dnp->n_attrstamp = 0;
1959 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1960 }
1961 NFSUNLOCKNODE(dnp);
1962 if (error && NFS_ISV4(dvp))
1963 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1964 return (error);
1965 }
1966
1967 /*
1968 * nfs file rename call
1969 */
1970 static int
nfs_rename(struct vop_rename_args * ap)1971 nfs_rename(struct vop_rename_args *ap)
1972 {
1973 struct vnode *fvp = ap->a_fvp;
1974 struct vnode *tvp = ap->a_tvp;
1975 struct vnode *fdvp = ap->a_fdvp;
1976 struct vnode *tdvp = ap->a_tdvp;
1977 struct componentname *tcnp = ap->a_tcnp;
1978 struct componentname *fcnp = ap->a_fcnp;
1979 struct nfsnode *fnp = VTONFS(ap->a_fvp);
1980 struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
1981 struct nfsv4node *newv4 = NULL;
1982 int error;
1983
1984 KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
1985 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
1986 /* Check for cross-device rename */
1987 if ((fvp->v_mount != tdvp->v_mount) ||
1988 (tvp && (fvp->v_mount != tvp->v_mount))) {
1989 error = EXDEV;
1990 goto out;
1991 }
1992
1993 if (fvp == tvp) {
1994 printf("nfs_rename: fvp == tvp (can't happen)\n");
1995 error = 0;
1996 goto out;
1997 }
1998 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
1999 goto out;
2000
2001 /*
2002 * We have to flush B_DELWRI data prior to renaming
2003 * the file. If we don't, the delayed-write buffers
2004 * can be flushed out later after the file has gone stale
2005 * under NFSV3. NFSV2 does not have this problem because
2006 * ( as far as I can tell ) it flushes dirty buffers more
2007 * often.
2008 *
2009 * Skip the rename operation if the fsync fails, this can happen
2010 * due to the server's volume being full, when we pushed out data
2011 * that was written back to our cache earlier. Not checking for
2012 * this condition can result in potential (silent) data loss.
2013 */
2014 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
2015 NFSVOPUNLOCK(fvp);
2016 if (!error && tvp)
2017 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
2018 if (error)
2019 goto out;
2020
2021 /*
2022 * If the tvp exists and is in use, sillyrename it before doing the
2023 * rename of the new file over it.
2024 * XXX Can't sillyrename a directory.
2025 */
2026 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
2027 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
2028 vput(tvp);
2029 tvp = NULL;
2030 }
2031
2032 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
2033 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
2034 tcnp->cn_thread);
2035
2036 if (error == 0 && NFS_ISV4(tdvp)) {
2037 /*
2038 * For NFSv4, check to see if it is the same name and
2039 * replace the name, if it is different.
2040 */
2041 newv4 = malloc(
2042 sizeof (struct nfsv4node) +
2043 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
2044 M_NFSV4NODE, M_WAITOK);
2045 NFSLOCKNODE(tdnp);
2046 NFSLOCKNODE(fnp);
2047 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
2048 (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
2049 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
2050 tcnp->cn_namelen) ||
2051 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
2052 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
2053 tdnp->n_fhp->nfh_len))) {
2054 #ifdef notdef
2055 { char nnn[100]; int nnnl;
2056 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
2057 bcopy(tcnp->cn_nameptr, nnn, nnnl);
2058 nnn[nnnl] = '\0';
2059 printf("ren replace=%s\n",nnn);
2060 }
2061 #endif
2062 free(fnp->n_v4, M_NFSV4NODE);
2063 fnp->n_v4 = newv4;
2064 newv4 = NULL;
2065 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
2066 fnp->n_v4->n4_namelen = tcnp->cn_namelen;
2067 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
2068 tdnp->n_fhp->nfh_len);
2069 NFSBCOPY(tcnp->cn_nameptr,
2070 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
2071 }
2072 NFSUNLOCKNODE(tdnp);
2073 NFSUNLOCKNODE(fnp);
2074 if (newv4 != NULL)
2075 free(newv4, M_NFSV4NODE);
2076 }
2077
2078 if (fvp->v_type == VDIR) {
2079 if (tvp != NULL && tvp->v_type == VDIR)
2080 cache_purge(tdvp);
2081 cache_purge(fdvp);
2082 }
2083
2084 out:
2085 if (tdvp == tvp)
2086 vrele(tdvp);
2087 else
2088 vput(tdvp);
2089 if (tvp)
2090 vput(tvp);
2091 vrele(fdvp);
2092 vrele(fvp);
2093 /*
2094 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
2095 */
2096 if (error == ENOENT)
2097 error = 0;
2098 return (error);
2099 }
2100
2101 /*
2102 * nfs file rename rpc called from nfs_remove() above
2103 */
2104 static int
nfs_renameit(struct vnode * sdvp,struct vnode * svp,struct componentname * scnp,struct sillyrename * sp)2105 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
2106 struct sillyrename *sp)
2107 {
2108
2109 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
2110 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
2111 scnp->cn_thread));
2112 }
2113
2114 /*
2115 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
2116 */
2117 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)2118 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
2119 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
2120 int tnamelen, struct ucred *cred, struct thread *td)
2121 {
2122 struct nfsvattr fnfsva, tnfsva;
2123 struct nfsnode *fdnp = VTONFS(fdvp);
2124 struct nfsnode *tdnp = VTONFS(tdvp);
2125 int error = 0, fattrflag, tattrflag;
2126
2127 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
2128 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
2129 &tattrflag, NULL, NULL);
2130 NFSLOCKNODE(fdnp);
2131 fdnp->n_flag |= NMODIFIED;
2132 if (fattrflag != 0) {
2133 NFSUNLOCKNODE(fdnp);
2134 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1);
2135 } else {
2136 fdnp->n_attrstamp = 0;
2137 NFSUNLOCKNODE(fdnp);
2138 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
2139 }
2140 NFSLOCKNODE(tdnp);
2141 tdnp->n_flag |= NMODIFIED;
2142 if (tattrflag != 0) {
2143 NFSUNLOCKNODE(tdnp);
2144 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1);
2145 } else {
2146 tdnp->n_attrstamp = 0;
2147 NFSUNLOCKNODE(tdnp);
2148 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
2149 }
2150 if (error && NFS_ISV4(fdvp))
2151 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2152 return (error);
2153 }
2154
2155 /*
2156 * nfs hard link create call
2157 */
2158 static int
nfs_link(struct vop_link_args * ap)2159 nfs_link(struct vop_link_args *ap)
2160 {
2161 struct vnode *vp = ap->a_vp;
2162 struct vnode *tdvp = ap->a_tdvp;
2163 struct componentname *cnp = ap->a_cnp;
2164 struct nfsnode *np, *tdnp;
2165 struct nfsvattr nfsva, dnfsva;
2166 int error = 0, attrflag, dattrflag;
2167
2168 /*
2169 * Push all writes to the server, so that the attribute cache
2170 * doesn't get "out of sync" with the server.
2171 * XXX There should be a better way!
2172 */
2173 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
2174
2175 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
2176 cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag,
2177 &dattrflag, NULL);
2178 tdnp = VTONFS(tdvp);
2179 NFSLOCKNODE(tdnp);
2180 tdnp->n_flag |= NMODIFIED;
2181 if (dattrflag != 0) {
2182 NFSUNLOCKNODE(tdnp);
2183 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1);
2184 } else {
2185 tdnp->n_attrstamp = 0;
2186 NFSUNLOCKNODE(tdnp);
2187 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
2188 }
2189 if (attrflag)
2190 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2191 else {
2192 np = VTONFS(vp);
2193 NFSLOCKNODE(np);
2194 np->n_attrstamp = 0;
2195 NFSUNLOCKNODE(np);
2196 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
2197 }
2198 /*
2199 * If negative lookup caching is enabled, I might as well
2200 * add an entry for this node. Not necessary for correctness,
2201 * but if negative caching is enabled, then the system
2202 * must care about lookup caching hit rate, so...
2203 */
2204 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
2205 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2206 if (tdvp != vp)
2207 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL);
2208 else
2209 printf("nfs_link: bogus NFS server returned "
2210 "the directory as the new link\n");
2211 }
2212 if (error && NFS_ISV4(vp))
2213 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
2214 (gid_t)0);
2215 return (error);
2216 }
2217
2218 /*
2219 * nfs symbolic link create call
2220 */
2221 static int
nfs_symlink(struct vop_symlink_args * ap)2222 nfs_symlink(struct vop_symlink_args *ap)
2223 {
2224 struct vnode *dvp = ap->a_dvp;
2225 struct vattr *vap = ap->a_vap;
2226 struct componentname *cnp = ap->a_cnp;
2227 struct nfsvattr nfsva, dnfsva;
2228 struct nfsfh *nfhp;
2229 struct nfsnode *np = NULL, *dnp;
2230 struct vnode *newvp = NULL;
2231 int error = 0, attrflag, dattrflag, ret;
2232
2233 vap->va_type = VLNK;
2234 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2235 ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva,
2236 &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
2237 if (nfhp) {
2238 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
2239 &np, NULL, LK_EXCLUSIVE);
2240 if (!ret)
2241 newvp = NFSTOV(np);
2242 else if (!error)
2243 error = ret;
2244 }
2245 if (newvp != NULL) {
2246 if (attrflag)
2247 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
2248 0, 1);
2249 } else if (!error) {
2250 /*
2251 * If we do not have an error and we could not extract the
2252 * newvp from the response due to the request being NFSv2, we
2253 * have to do a lookup in order to obtain a newvp to return.
2254 */
2255 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2256 cnp->cn_cred, cnp->cn_thread, &np);
2257 if (!error)
2258 newvp = NFSTOV(np);
2259 }
2260 if (error) {
2261 if (newvp)
2262 vput(newvp);
2263 if (NFS_ISV4(dvp))
2264 error = nfscl_maperr(cnp->cn_thread, error,
2265 vap->va_uid, vap->va_gid);
2266 } else {
2267 *ap->a_vpp = newvp;
2268 }
2269
2270 dnp = VTONFS(dvp);
2271 NFSLOCKNODE(dnp);
2272 dnp->n_flag |= NMODIFIED;
2273 if (dattrflag != 0) {
2274 NFSUNLOCKNODE(dnp);
2275 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2276 } else {
2277 dnp->n_attrstamp = 0;
2278 NFSUNLOCKNODE(dnp);
2279 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2280 }
2281 /*
2282 * If negative lookup caching is enabled, I might as well
2283 * add an entry for this node. Not necessary for correctness,
2284 * but if negative caching is enabled, then the system
2285 * must care about lookup caching hit rate, so...
2286 */
2287 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2288 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2289 if (dvp != newvp)
2290 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
2291 NULL);
2292 else
2293 printf("nfs_symlink: bogus NFS server returned "
2294 "the directory as the new file object\n");
2295 }
2296 return (error);
2297 }
2298
2299 /*
2300 * nfs make dir call
2301 */
2302 static int
nfs_mkdir(struct vop_mkdir_args * ap)2303 nfs_mkdir(struct vop_mkdir_args *ap)
2304 {
2305 struct vnode *dvp = ap->a_dvp;
2306 struct vattr *vap = ap->a_vap;
2307 struct componentname *cnp = ap->a_cnp;
2308 struct nfsnode *np = NULL, *dnp;
2309 struct vnode *newvp = NULL;
2310 struct vattr vattr;
2311 struct nfsfh *nfhp;
2312 struct nfsvattr nfsva, dnfsva;
2313 int error = 0, attrflag, dattrflag, ret;
2314
2315 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
2316 return (error);
2317 vap->va_type = VDIR;
2318 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2319 vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp,
2320 &attrflag, &dattrflag, NULL);
2321 dnp = VTONFS(dvp);
2322 NFSLOCKNODE(dnp);
2323 dnp->n_flag |= NMODIFIED;
2324 if (dattrflag != 0) {
2325 NFSUNLOCKNODE(dnp);
2326 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2327 } else {
2328 dnp->n_attrstamp = 0;
2329 NFSUNLOCKNODE(dnp);
2330 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2331 }
2332 if (nfhp) {
2333 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
2334 &np, NULL, LK_EXCLUSIVE);
2335 if (!ret) {
2336 newvp = NFSTOV(np);
2337 if (attrflag)
2338 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
2339 NULL, 0, 1);
2340 } else if (!error)
2341 error = ret;
2342 }
2343 if (!error && newvp == NULL) {
2344 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2345 cnp->cn_cred, cnp->cn_thread, &np);
2346 if (!error) {
2347 newvp = NFSTOV(np);
2348 if (newvp->v_type != VDIR)
2349 error = EEXIST;
2350 }
2351 }
2352 if (error) {
2353 if (newvp)
2354 vput(newvp);
2355 if (NFS_ISV4(dvp))
2356 error = nfscl_maperr(cnp->cn_thread, error,
2357 vap->va_uid, vap->va_gid);
2358 } else {
2359 /*
2360 * If negative lookup caching is enabled, I might as well
2361 * add an entry for this node. Not necessary for correctness,
2362 * but if negative caching is enabled, then the system
2363 * must care about lookup caching hit rate, so...
2364 */
2365 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2366 (cnp->cn_flags & MAKEENTRY) &&
2367 attrflag != 0 && dattrflag != 0) {
2368 if (dvp != newvp)
2369 cache_enter_time(dvp, newvp, cnp,
2370 &nfsva.na_ctime, &dnfsva.na_ctime);
2371 else
2372 printf("nfs_mkdir: bogus NFS server returned "
2373 "the directory that the directory was "
2374 "created in as the new file object\n");
2375 }
2376 *ap->a_vpp = newvp;
2377 }
2378 return (error);
2379 }
2380
2381 /*
2382 * nfs remove directory call
2383 */
2384 static int
nfs_rmdir(struct vop_rmdir_args * ap)2385 nfs_rmdir(struct vop_rmdir_args *ap)
2386 {
2387 struct vnode *vp = ap->a_vp;
2388 struct vnode *dvp = ap->a_dvp;
2389 struct componentname *cnp = ap->a_cnp;
2390 struct nfsnode *dnp;
2391 struct nfsvattr dnfsva;
2392 int error, dattrflag;
2393
2394 if (dvp == vp)
2395 return (EINVAL);
2396 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2397 cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL);
2398 dnp = VTONFS(dvp);
2399 NFSLOCKNODE(dnp);
2400 dnp->n_flag |= NMODIFIED;
2401 if (dattrflag != 0) {
2402 NFSUNLOCKNODE(dnp);
2403 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2404 } else {
2405 dnp->n_attrstamp = 0;
2406 NFSUNLOCKNODE(dnp);
2407 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2408 }
2409
2410 cache_purge(dvp);
2411 cache_purge(vp);
2412 if (error && NFS_ISV4(dvp))
2413 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
2414 (gid_t)0);
2415 /*
2416 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
2417 */
2418 if (error == ENOENT)
2419 error = 0;
2420 return (error);
2421 }
2422
2423 /*
2424 * nfs readdir call
2425 */
2426 static int
nfs_readdir(struct vop_readdir_args * ap)2427 nfs_readdir(struct vop_readdir_args *ap)
2428 {
2429 struct vnode *vp = ap->a_vp;
2430 struct nfsnode *np = VTONFS(vp);
2431 struct uio *uio = ap->a_uio;
2432 ssize_t tresid, left;
2433 int error = 0;
2434 struct vattr vattr;
2435
2436 if (ap->a_eofflag != NULL)
2437 *ap->a_eofflag = 0;
2438 if (vp->v_type != VDIR)
2439 return(EPERM);
2440
2441 /*
2442 * First, check for hit on the EOF offset cache
2443 */
2444 NFSLOCKNODE(np);
2445 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
2446 (np->n_flag & NMODIFIED) == 0) {
2447 NFSUNLOCKNODE(np);
2448 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
2449 NFSLOCKNODE(np);
2450 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
2451 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
2452 NFSUNLOCKNODE(np);
2453 NFSINCRGLOBAL(nfsstatsv1.direofcache_hits);
2454 if (ap->a_eofflag != NULL)
2455 *ap->a_eofflag = 1;
2456 return (0);
2457 } else
2458 NFSUNLOCKNODE(np);
2459 }
2460 } else
2461 NFSUNLOCKNODE(np);
2462
2463 /*
2464 * NFS always guarantees that directory entries don't straddle
2465 * DIRBLKSIZ boundaries. As such, we need to limit the size
2466 * to an exact multiple of DIRBLKSIZ, to avoid copying a partial
2467 * directory entry.
2468 */
2469 left = uio->uio_resid % DIRBLKSIZ;
2470 if (left == uio->uio_resid)
2471 return (EINVAL);
2472 uio->uio_resid -= left;
2473
2474 /*
2475 * Call ncl_bioread() to do the real work.
2476 */
2477 tresid = uio->uio_resid;
2478 error = ncl_bioread(vp, uio, 0, ap->a_cred);
2479
2480 if (!error && uio->uio_resid == tresid) {
2481 NFSINCRGLOBAL(nfsstatsv1.direofcache_misses);
2482 if (ap->a_eofflag != NULL)
2483 *ap->a_eofflag = 1;
2484 }
2485
2486 /* Add the partial DIRBLKSIZ (left) back in. */
2487 uio->uio_resid += left;
2488 return (error);
2489 }
2490
2491 /*
2492 * Readdir rpc call.
2493 * Called from below the buffer cache by ncl_doio().
2494 */
2495 int
ncl_readdirrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred,struct thread * td)2496 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2497 struct thread *td)
2498 {
2499 struct nfsvattr nfsva;
2500 nfsuint64 *cookiep, cookie;
2501 struct nfsnode *dnp = VTONFS(vp);
2502 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2503 int error = 0, eof, attrflag;
2504
2505 KASSERT(uiop->uio_iovcnt == 1 &&
2506 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2507 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2508 ("nfs readdirrpc bad uio"));
2509
2510 /*
2511 * If there is no cookie, assume directory was stale.
2512 */
2513 ncl_dircookie_lock(dnp);
2514 NFSUNLOCKNODE(dnp);
2515 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2516 if (cookiep) {
2517 cookie = *cookiep;
2518 ncl_dircookie_unlock(dnp);
2519 } else {
2520 ncl_dircookie_unlock(dnp);
2521 return (NFSERR_BAD_COOKIE);
2522 }
2523
2524 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2525 (void)ncl_fsinfo(nmp, vp, cred, td);
2526
2527 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
2528 &attrflag, &eof, NULL);
2529 if (attrflag)
2530 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2531
2532 if (!error) {
2533 /*
2534 * We are now either at the end of the directory or have filled
2535 * the block.
2536 */
2537 if (eof) {
2538 NFSLOCKNODE(dnp);
2539 dnp->n_direofoffset = uiop->uio_offset;
2540 NFSUNLOCKNODE(dnp);
2541 } else {
2542 if (uiop->uio_resid > 0)
2543 printf("EEK! readdirrpc resid > 0\n");
2544 ncl_dircookie_lock(dnp);
2545 NFSUNLOCKNODE(dnp);
2546 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2547 *cookiep = cookie;
2548 ncl_dircookie_unlock(dnp);
2549 }
2550 } else if (NFS_ISV4(vp)) {
2551 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2552 }
2553 return (error);
2554 }
2555
2556 /*
2557 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
2558 */
2559 int
ncl_readdirplusrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred,struct thread * td)2560 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2561 struct thread *td)
2562 {
2563 struct nfsvattr nfsva;
2564 nfsuint64 *cookiep, cookie;
2565 struct nfsnode *dnp = VTONFS(vp);
2566 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2567 int error = 0, attrflag, eof;
2568
2569 KASSERT(uiop->uio_iovcnt == 1 &&
2570 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2571 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2572 ("nfs readdirplusrpc bad uio"));
2573
2574 /*
2575 * If there is no cookie, assume directory was stale.
2576 */
2577 ncl_dircookie_lock(dnp);
2578 NFSUNLOCKNODE(dnp);
2579 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2580 if (cookiep) {
2581 cookie = *cookiep;
2582 ncl_dircookie_unlock(dnp);
2583 } else {
2584 ncl_dircookie_unlock(dnp);
2585 return (NFSERR_BAD_COOKIE);
2586 }
2587
2588 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2589 (void)ncl_fsinfo(nmp, vp, cred, td);
2590 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
2591 &attrflag, &eof, NULL);
2592 if (attrflag)
2593 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2594
2595 if (!error) {
2596 /*
2597 * We are now either at end of the directory or have filled the
2598 * the block.
2599 */
2600 if (eof) {
2601 NFSLOCKNODE(dnp);
2602 dnp->n_direofoffset = uiop->uio_offset;
2603 NFSUNLOCKNODE(dnp);
2604 } else {
2605 if (uiop->uio_resid > 0)
2606 printf("EEK! readdirplusrpc resid > 0\n");
2607 ncl_dircookie_lock(dnp);
2608 NFSUNLOCKNODE(dnp);
2609 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2610 *cookiep = cookie;
2611 ncl_dircookie_unlock(dnp);
2612 }
2613 } else if (NFS_ISV4(vp)) {
2614 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2615 }
2616 return (error);
2617 }
2618
2619 /*
2620 * Silly rename. To make the NFS filesystem that is stateless look a little
2621 * more like the "ufs" a remove of an active vnode is translated to a rename
2622 * to a funny looking filename that is removed by nfs_inactive on the
2623 * nfsnode. There is the potential for another process on a different client
2624 * to create the same funny name between the nfs_lookitup() fails and the
2625 * nfs_rename() completes, but...
2626 */
2627 static int
nfs_sillyrename(struct vnode * dvp,struct vnode * vp,struct componentname * cnp)2628 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
2629 {
2630 struct sillyrename *sp;
2631 struct nfsnode *np;
2632 int error;
2633 short pid;
2634 unsigned int lticks;
2635
2636 cache_purge(dvp);
2637 np = VTONFS(vp);
2638 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
2639 sp = malloc(sizeof (struct sillyrename),
2640 M_NEWNFSREQ, M_WAITOK);
2641 sp->s_cred = crhold(cnp->cn_cred);
2642 sp->s_dvp = dvp;
2643 VREF(dvp);
2644
2645 /*
2646 * Fudge together a funny name.
2647 * Changing the format of the funny name to accommodate more
2648 * sillynames per directory.
2649 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is
2650 * CPU ticks since boot.
2651 */
2652 pid = cnp->cn_thread->td_proc->p_pid;
2653 lticks = (unsigned int)ticks;
2654 for ( ; ; ) {
2655 sp->s_namlen = sprintf(sp->s_name,
2656 ".nfs.%08x.%04x4.4", lticks,
2657 pid);
2658 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2659 cnp->cn_thread, NULL))
2660 break;
2661 lticks++;
2662 }
2663 error = nfs_renameit(dvp, vp, cnp, sp);
2664 if (error)
2665 goto bad;
2666 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2667 cnp->cn_thread, &np);
2668 np->n_sillyrename = sp;
2669 return (0);
2670 bad:
2671 vrele(sp->s_dvp);
2672 crfree(sp->s_cred);
2673 free(sp, M_NEWNFSREQ);
2674 return (error);
2675 }
2676
2677 /*
2678 * Look up a file name and optionally either update the file handle or
2679 * allocate an nfsnode, depending on the value of npp.
2680 * npp == NULL --> just do the lookup
2681 * *npp == NULL --> allocate a new nfsnode and make sure attributes are
2682 * handled too
2683 * *npp != NULL --> update the file handle in the vnode
2684 */
2685 static int
nfs_lookitup(struct vnode * dvp,char * name,int len,struct ucred * cred,struct thread * td,struct nfsnode ** npp)2686 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
2687 struct thread *td, struct nfsnode **npp)
2688 {
2689 struct vnode *newvp = NULL, *vp;
2690 struct nfsnode *np, *dnp = VTONFS(dvp);
2691 struct nfsfh *nfhp, *onfhp;
2692 struct nfsvattr nfsva, dnfsva;
2693 struct componentname cn;
2694 int error = 0, attrflag, dattrflag;
2695 u_int hash;
2696 struct timespec ts;
2697
2698 nanouptime(&ts);
2699 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
2700 &nfhp, &attrflag, &dattrflag, NULL);
2701 if (dattrflag)
2702 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2703 if (npp && !error) {
2704 if (*npp != NULL) {
2705 np = *npp;
2706 vp = NFSTOV(np);
2707 /*
2708 * For NFSv4, check to see if it is the same name and
2709 * replace the name, if it is different.
2710 */
2711 if (np->n_v4 != NULL && nfsva.na_type == VREG &&
2712 (np->n_v4->n4_namelen != len ||
2713 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
2714 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
2715 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2716 dnp->n_fhp->nfh_len))) {
2717 #ifdef notdef
2718 { char nnn[100]; int nnnl;
2719 nnnl = (len < 100) ? len : 99;
2720 bcopy(name, nnn, nnnl);
2721 nnn[nnnl] = '\0';
2722 printf("replace=%s\n",nnn);
2723 }
2724 #endif
2725 free(np->n_v4, M_NFSV4NODE);
2726 np->n_v4 = malloc(
2727 sizeof (struct nfsv4node) +
2728 dnp->n_fhp->nfh_len + len - 1,
2729 M_NFSV4NODE, M_WAITOK);
2730 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
2731 np->n_v4->n4_namelen = len;
2732 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2733 dnp->n_fhp->nfh_len);
2734 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
2735 }
2736 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
2737 FNV1_32_INIT);
2738 onfhp = np->n_fhp;
2739 /*
2740 * Rehash node for new file handle.
2741 */
2742 vfs_hash_rehash(vp, hash);
2743 np->n_fhp = nfhp;
2744 if (onfhp != NULL)
2745 free(onfhp, M_NFSFH);
2746 newvp = NFSTOV(np);
2747 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
2748 free(nfhp, M_NFSFH);
2749 VREF(dvp);
2750 newvp = dvp;
2751 } else {
2752 cn.cn_nameptr = name;
2753 cn.cn_namelen = len;
2754 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
2755 &np, NULL, LK_EXCLUSIVE);
2756 if (error)
2757 return (error);
2758 newvp = NFSTOV(np);
2759 /*
2760 * If n_localmodtime >= time before RPC, then
2761 * a file modification operation, such as
2762 * VOP_SETATTR() of size, has occurred while
2763 * the Lookup RPC and acquisition of the vnode
2764 * happened. As such, the attributes might
2765 * be stale, with possibly an incorrect size.
2766 */
2767 NFSLOCKNODE(np);
2768 if (timespecisset(&np->n_localmodtime) &&
2769 timespeccmp(&np->n_localmodtime, &ts, >=)) {
2770 NFSCL_DEBUG(4, "nfs_lookitup: localmod "
2771 "stale attributes\n");
2772 attrflag = 0;
2773 }
2774 NFSUNLOCKNODE(np);
2775 }
2776 if (!attrflag && *npp == NULL) {
2777 if (newvp == dvp)
2778 vrele(newvp);
2779 else
2780 vput(newvp);
2781 return (ENOENT);
2782 }
2783 if (attrflag)
2784 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
2785 0, 1);
2786 }
2787 if (npp && *npp == NULL) {
2788 if (error) {
2789 if (newvp) {
2790 if (newvp == dvp)
2791 vrele(newvp);
2792 else
2793 vput(newvp);
2794 }
2795 } else
2796 *npp = np;
2797 }
2798 if (error && NFS_ISV4(dvp))
2799 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2800 return (error);
2801 }
2802
2803 /*
2804 * Nfs Version 3 and 4 commit rpc
2805 */
2806 int
ncl_commit(struct vnode * vp,u_quad_t offset,int cnt,struct ucred * cred,struct thread * td)2807 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
2808 struct thread *td)
2809 {
2810 struct nfsvattr nfsva;
2811 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2812 struct nfsnode *np;
2813 struct uio uio;
2814 int error, attrflag;
2815
2816 np = VTONFS(vp);
2817 error = EIO;
2818 attrflag = 0;
2819 if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) {
2820 uio.uio_offset = offset;
2821 uio.uio_resid = cnt;
2822 error = nfscl_doiods(vp, &uio, NULL, NULL,
2823 NFSV4OPEN_ACCESSWRITE, 1, cred, td);
2824 if (error != 0) {
2825 NFSLOCKNODE(np);
2826 np->n_flag &= ~NDSCOMMIT;
2827 NFSUNLOCKNODE(np);
2828 }
2829 }
2830 if (error != 0) {
2831 mtx_lock(&nmp->nm_mtx);
2832 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
2833 mtx_unlock(&nmp->nm_mtx);
2834 return (0);
2835 }
2836 mtx_unlock(&nmp->nm_mtx);
2837 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva,
2838 &attrflag, NULL);
2839 }
2840 if (attrflag != 0)
2841 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL,
2842 0, 1);
2843 if (error != 0 && NFS_ISV4(vp))
2844 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2845 return (error);
2846 }
2847
2848 /*
2849 * Strategy routine.
2850 * For async requests when nfsiod(s) are running, queue the request by
2851 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
2852 * request.
2853 */
2854 static int
nfs_strategy(struct vop_strategy_args * ap)2855 nfs_strategy(struct vop_strategy_args *ap)
2856 {
2857 struct buf *bp;
2858 struct vnode *vp;
2859 struct ucred *cr;
2860
2861 bp = ap->a_bp;
2862 vp = ap->a_vp;
2863 KASSERT(bp->b_vp == vp, ("missing b_getvp"));
2864 KASSERT(!(bp->b_flags & B_DONE),
2865 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
2866
2867 if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno)
2868 bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize /
2869 DEV_BSIZE);
2870 if (bp->b_iocmd == BIO_READ)
2871 cr = bp->b_rcred;
2872 else
2873 cr = bp->b_wcred;
2874
2875 /*
2876 * If the op is asynchronous and an i/o daemon is waiting
2877 * queue the request, wake it up and wait for completion
2878 * otherwise just do it ourselves.
2879 */
2880 if ((bp->b_flags & B_ASYNC) == 0 ||
2881 ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread))
2882 (void) ncl_doio(vp, bp, cr, curthread, 1);
2883 return (0);
2884 }
2885
2886 /*
2887 * fsync vnode op. Just call ncl_flush() with commit == 1.
2888 */
2889 /* ARGSUSED */
2890 static int
nfs_fsync(struct vop_fsync_args * ap)2891 nfs_fsync(struct vop_fsync_args *ap)
2892 {
2893
2894 if (ap->a_vp->v_type != VREG) {
2895 /*
2896 * For NFS, metadata is changed synchronously on the server,
2897 * so there is nothing to flush. Also, ncl_flush() clears
2898 * the NMODIFIED flag and that shouldn't be done here for
2899 * directories.
2900 */
2901 return (0);
2902 }
2903 return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0));
2904 }
2905
2906 /*
2907 * Flush all the blocks associated with a vnode.
2908 * Walk through the buffer pool and push any dirty pages
2909 * associated with the vnode.
2910 * If the called_from_renewthread argument is TRUE, it has been called
2911 * from the NFSv4 renew thread and, as such, cannot block indefinitely
2912 * waiting for a buffer write to complete.
2913 */
2914 int
ncl_flush(struct vnode * vp,int waitfor,struct thread * td,int commit,int called_from_renewthread)2915 ncl_flush(struct vnode *vp, int waitfor, struct thread *td,
2916 int commit, int called_from_renewthread)
2917 {
2918 struct nfsnode *np = VTONFS(vp);
2919 struct buf *bp;
2920 int i;
2921 struct buf *nbp;
2922 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2923 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
2924 int passone = 1, trycnt = 0;
2925 u_quad_t off, endoff, toff;
2926 struct ucred* wcred = NULL;
2927 struct buf **bvec = NULL;
2928 struct bufobj *bo;
2929 #ifndef NFS_COMMITBVECSIZ
2930 #define NFS_COMMITBVECSIZ 20
2931 #endif
2932 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
2933 u_int bvecsize = 0, bveccount;
2934 struct timespec ts;
2935
2936 if (called_from_renewthread != 0)
2937 slptimeo = hz;
2938 if (nmp->nm_flag & NFSMNT_INT)
2939 slpflag = PCATCH;
2940 if (!commit)
2941 passone = 0;
2942 bo = &vp->v_bufobj;
2943 /*
2944 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
2945 * server, but has not been committed to stable storage on the server
2946 * yet. On the first pass, the byte range is worked out and the commit
2947 * rpc is done. On the second pass, bwrite() is called to do the
2948 * job.
2949 */
2950 again:
2951 off = (u_quad_t)-1;
2952 endoff = 0;
2953 bvecpos = 0;
2954 if (NFS_ISV34(vp) && commit) {
2955 if (bvec != NULL && bvec != bvec_on_stack)
2956 free(bvec, M_TEMP);
2957 /*
2958 * Count up how many buffers waiting for a commit.
2959 */
2960 bveccount = 0;
2961 BO_LOCK(bo);
2962 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2963 if (!BUF_ISLOCKED(bp) &&
2964 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
2965 == (B_DELWRI | B_NEEDCOMMIT))
2966 bveccount++;
2967 }
2968 /*
2969 * Allocate space to remember the list of bufs to commit. It is
2970 * important to use M_NOWAIT here to avoid a race with nfs_write.
2971 * If we can't get memory (for whatever reason), we will end up
2972 * committing the buffers one-by-one in the loop below.
2973 */
2974 if (bveccount > NFS_COMMITBVECSIZ) {
2975 /*
2976 * Release the vnode interlock to avoid a lock
2977 * order reversal.
2978 */
2979 BO_UNLOCK(bo);
2980 bvec = (struct buf **)
2981 malloc(bveccount * sizeof(struct buf *),
2982 M_TEMP, M_NOWAIT);
2983 BO_LOCK(bo);
2984 if (bvec == NULL) {
2985 bvec = bvec_on_stack;
2986 bvecsize = NFS_COMMITBVECSIZ;
2987 } else
2988 bvecsize = bveccount;
2989 } else {
2990 bvec = bvec_on_stack;
2991 bvecsize = NFS_COMMITBVECSIZ;
2992 }
2993 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2994 if (bvecpos >= bvecsize)
2995 break;
2996 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2997 nbp = TAILQ_NEXT(bp, b_bobufs);
2998 continue;
2999 }
3000 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
3001 (B_DELWRI | B_NEEDCOMMIT)) {
3002 BUF_UNLOCK(bp);
3003 nbp = TAILQ_NEXT(bp, b_bobufs);
3004 continue;
3005 }
3006 BO_UNLOCK(bo);
3007 bremfree(bp);
3008 /*
3009 * Work out if all buffers are using the same cred
3010 * so we can deal with them all with one commit.
3011 *
3012 * NOTE: we are not clearing B_DONE here, so we have
3013 * to do it later on in this routine if we intend to
3014 * initiate I/O on the bp.
3015 *
3016 * Note: to avoid loopback deadlocks, we do not
3017 * assign b_runningbufspace.
3018 */
3019 if (wcred == NULL)
3020 wcred = bp->b_wcred;
3021 else if (wcred != bp->b_wcred)
3022 wcred = NOCRED;
3023 vfs_busy_pages(bp, 0);
3024
3025 BO_LOCK(bo);
3026 /*
3027 * bp is protected by being locked, but nbp is not
3028 * and vfs_busy_pages() may sleep. We have to
3029 * recalculate nbp.
3030 */
3031 nbp = TAILQ_NEXT(bp, b_bobufs);
3032
3033 /*
3034 * A list of these buffers is kept so that the
3035 * second loop knows which buffers have actually
3036 * been committed. This is necessary, since there
3037 * may be a race between the commit rpc and new
3038 * uncommitted writes on the file.
3039 */
3040 bvec[bvecpos++] = bp;
3041 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
3042 bp->b_dirtyoff;
3043 if (toff < off)
3044 off = toff;
3045 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
3046 if (toff > endoff)
3047 endoff = toff;
3048 }
3049 BO_UNLOCK(bo);
3050 }
3051 if (bvecpos > 0) {
3052 /*
3053 * Commit data on the server, as required.
3054 * If all bufs are using the same wcred, then use that with
3055 * one call for all of them, otherwise commit each one
3056 * separately.
3057 */
3058 if (wcred != NOCRED)
3059 retv = ncl_commit(vp, off, (int)(endoff - off),
3060 wcred, td);
3061 else {
3062 retv = 0;
3063 for (i = 0; i < bvecpos; i++) {
3064 off_t off, size;
3065 bp = bvec[i];
3066 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
3067 bp->b_dirtyoff;
3068 size = (u_quad_t)(bp->b_dirtyend
3069 - bp->b_dirtyoff);
3070 retv = ncl_commit(vp, off, (int)size,
3071 bp->b_wcred, td);
3072 if (retv) break;
3073 }
3074 }
3075
3076 if (retv == NFSERR_STALEWRITEVERF)
3077 ncl_clearcommit(vp->v_mount);
3078
3079 /*
3080 * Now, either mark the blocks I/O done or mark the
3081 * blocks dirty, depending on whether the commit
3082 * succeeded.
3083 */
3084 for (i = 0; i < bvecpos; i++) {
3085 bp = bvec[i];
3086 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
3087 if (!NFSCL_FORCEDISM(vp->v_mount) && retv) {
3088 /*
3089 * Error, leave B_DELWRI intact
3090 */
3091 vfs_unbusy_pages(bp);
3092 brelse(bp);
3093 } else {
3094 /*
3095 * Success, remove B_DELWRI ( bundirty() ).
3096 *
3097 * b_dirtyoff/b_dirtyend seem to be NFS
3098 * specific. We should probably move that
3099 * into bundirty(). XXX
3100 */
3101 bufobj_wref(bo);
3102 bp->b_flags |= B_ASYNC;
3103 bundirty(bp);
3104 bp->b_flags &= ~B_DONE;
3105 bp->b_ioflags &= ~BIO_ERROR;
3106 bp->b_dirtyoff = bp->b_dirtyend = 0;
3107 bufdone(bp);
3108 }
3109 }
3110 }
3111
3112 /*
3113 * Start/do any write(s) that are required.
3114 */
3115 loop:
3116 BO_LOCK(bo);
3117 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
3118 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
3119 if (waitfor != MNT_WAIT || passone)
3120 continue;
3121
3122 error = BUF_TIMELOCK(bp,
3123 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
3124 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo);
3125 if (error == 0) {
3126 BUF_UNLOCK(bp);
3127 goto loop;
3128 }
3129 if (error == ENOLCK) {
3130 error = 0;
3131 goto loop;
3132 }
3133 if (called_from_renewthread != 0) {
3134 /*
3135 * Return EIO so the flush will be retried
3136 * later.
3137 */
3138 error = EIO;
3139 goto done;
3140 }
3141 if (newnfs_sigintr(nmp, td)) {
3142 error = EINTR;
3143 goto done;
3144 }
3145 if (slpflag == PCATCH) {
3146 slpflag = 0;
3147 slptimeo = 2 * hz;
3148 }
3149 goto loop;
3150 }
3151 if ((bp->b_flags & B_DELWRI) == 0)
3152 panic("nfs_fsync: not dirty");
3153 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
3154 BUF_UNLOCK(bp);
3155 continue;
3156 }
3157 BO_UNLOCK(bo);
3158 bremfree(bp);
3159 bp->b_flags |= B_ASYNC;
3160 bwrite(bp);
3161 if (newnfs_sigintr(nmp, td)) {
3162 error = EINTR;
3163 goto done;
3164 }
3165 goto loop;
3166 }
3167 if (passone) {
3168 passone = 0;
3169 BO_UNLOCK(bo);
3170 goto again;
3171 }
3172 if (waitfor == MNT_WAIT) {
3173 while (bo->bo_numoutput) {
3174 error = bufobj_wwait(bo, slpflag, slptimeo);
3175 if (error) {
3176 BO_UNLOCK(bo);
3177 if (called_from_renewthread != 0) {
3178 /*
3179 * Return EIO so that the flush will be
3180 * retried later.
3181 */
3182 error = EIO;
3183 goto done;
3184 }
3185 error = newnfs_sigintr(nmp, td);
3186 if (error)
3187 goto done;
3188 if (slpflag == PCATCH) {
3189 slpflag = 0;
3190 slptimeo = 2 * hz;
3191 }
3192 BO_LOCK(bo);
3193 }
3194 }
3195 if (bo->bo_dirty.bv_cnt != 0 && commit) {
3196 BO_UNLOCK(bo);
3197 goto loop;
3198 }
3199 /*
3200 * Wait for all the async IO requests to drain
3201 */
3202 BO_UNLOCK(bo);
3203 } else
3204 BO_UNLOCK(bo);
3205 if (NFSHASPNFS(nmp)) {
3206 nfscl_layoutcommit(vp, td);
3207 /*
3208 * Invalidate the attribute cache, since writes to a DS
3209 * won't update the size attribute.
3210 */
3211 NFSLOCKNODE(np);
3212 np->n_attrstamp = 0;
3213 } else
3214 NFSLOCKNODE(np);
3215 if (np->n_flag & NWRITEERR) {
3216 error = np->n_error;
3217 np->n_flag &= ~NWRITEERR;
3218 }
3219 if (commit && bo->bo_dirty.bv_cnt == 0 &&
3220 bo->bo_numoutput == 0)
3221 np->n_flag &= ~NMODIFIED;
3222 NFSUNLOCKNODE(np);
3223 done:
3224 if (bvec != NULL && bvec != bvec_on_stack)
3225 free(bvec, M_TEMP);
3226 if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
3227 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0)) {
3228 if (trycnt++ < 5) {
3229 /* try, try again... */
3230 passone = 1;
3231 wcred = NULL;
3232 bvec = NULL;
3233 bvecsize = 0;
3234 goto again;
3235 }
3236 vn_printf(vp, "ncl_flush failed");
3237 error = called_from_renewthread != 0 ? EIO : EBUSY;
3238 }
3239 if (error == 0) {
3240 nanouptime(&ts);
3241 NFSLOCKNODE(np);
3242 np->n_localmodtime = ts;
3243 NFSUNLOCKNODE(np);
3244 }
3245 return (error);
3246 }
3247
3248 /*
3249 * NFS advisory byte-level locks.
3250 */
3251 static int
nfs_advlock(struct vop_advlock_args * ap)3252 nfs_advlock(struct vop_advlock_args *ap)
3253 {
3254 struct vnode *vp = ap->a_vp;
3255 struct ucred *cred;
3256 struct nfsnode *np = VTONFS(ap->a_vp);
3257 struct proc *p = (struct proc *)ap->a_id;
3258 struct thread *td = curthread; /* XXX */
3259 struct vattr va;
3260 int ret, error;
3261 u_quad_t size;
3262 struct nfsmount *nmp;
3263
3264 error = NFSVOPLOCK(vp, LK_SHARED);
3265 if (error != 0)
3266 return (EBADF);
3267 nmp = VFSTONFS(vp->v_mount);
3268 if (!NFS_ISV4(vp) || (nmp->nm_flag & NFSMNT_NOLOCKD) != 0) {
3269 if ((nmp->nm_flag & NFSMNT_NOLOCKD) != 0) {
3270 size = np->n_size;
3271 NFSVOPUNLOCK(vp);
3272 error = lf_advlock(ap, &(vp->v_lockf), size);
3273 } else {
3274 if (nfs_advlock_p != NULL)
3275 error = nfs_advlock_p(ap);
3276 else {
3277 NFSVOPUNLOCK(vp);
3278 error = ENOLCK;
3279 }
3280 }
3281 if (error == 0 && ap->a_op == F_SETLK) {
3282 error = NFSVOPLOCK(vp, LK_SHARED);
3283 if (error == 0) {
3284 /* Mark that a file lock has been acquired. */
3285 NFSLOCKNODE(np);
3286 np->n_flag |= NHASBEENLOCKED;
3287 NFSUNLOCKNODE(np);
3288 NFSVOPUNLOCK(vp);
3289 }
3290 }
3291 return (error);
3292 } else if ((ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
3293 if (vp->v_type != VREG) {
3294 error = EINVAL;
3295 goto out;
3296 }
3297 if ((ap->a_flags & F_POSIX) != 0)
3298 cred = p->p_ucred;
3299 else
3300 cred = td->td_ucred;
3301 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
3302 if (VN_IS_DOOMED(vp)) {
3303 error = EBADF;
3304 goto out;
3305 }
3306
3307 /*
3308 * If this is unlocking a write locked region, flush and
3309 * commit them before unlocking. This is required by
3310 * RFC3530 Sec. 9.3.2.
3311 */
3312 if (ap->a_op == F_UNLCK &&
3313 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
3314 ap->a_flags))
3315 (void) ncl_flush(vp, MNT_WAIT, td, 1, 0);
3316
3317 /*
3318 * Mark NFS node as might have acquired a lock.
3319 * This is separate from NHASBEENLOCKED, because it must
3320 * be done before the nfsrpc_advlock() call, which might
3321 * add a nfscllock structure to the client state.
3322 * It is used to check for the case where a nfscllock
3323 * state structure cannot exist for the file.
3324 * Only done for "oneopenown" NFSv4.1/4.2 mounts.
3325 */
3326 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp)) {
3327 NFSLOCKNODE(np);
3328 np->n_flag |= NMIGHTBELOCKED;
3329 NFSUNLOCKNODE(np);
3330 }
3331
3332 /*
3333 * Loop around doing the lock op, while a blocking lock
3334 * must wait for the lock op to succeed.
3335 */
3336 do {
3337 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
3338 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
3339 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3340 ap->a_op == F_SETLK) {
3341 NFSVOPUNLOCK(vp);
3342 error = nfs_catnap(PZERO | PCATCH, ret,
3343 "ncladvl");
3344 if (error)
3345 return (EINTR);
3346 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
3347 if (VN_IS_DOOMED(vp)) {
3348 error = EBADF;
3349 goto out;
3350 }
3351 }
3352 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3353 ap->a_op == F_SETLK);
3354 if (ret == NFSERR_DENIED) {
3355 error = EAGAIN;
3356 goto out;
3357 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
3358 error = ret;
3359 goto out;
3360 } else if (ret != 0) {
3361 error = EACCES;
3362 goto out;
3363 }
3364
3365 /*
3366 * Now, if we just got a lock, invalidate data in the buffer
3367 * cache, as required, so that the coherency conforms with
3368 * RFC3530 Sec. 9.3.2.
3369 */
3370 if (ap->a_op == F_SETLK) {
3371 if ((np->n_flag & NMODIFIED) == 0) {
3372 np->n_attrstamp = 0;
3373 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3374 ret = VOP_GETATTR(vp, &va, cred);
3375 }
3376 if ((np->n_flag & NMODIFIED) || ret ||
3377 np->n_change != va.va_filerev) {
3378 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
3379 np->n_attrstamp = 0;
3380 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3381 ret = VOP_GETATTR(vp, &va, cred);
3382 if (!ret) {
3383 np->n_mtime = va.va_mtime;
3384 np->n_change = va.va_filerev;
3385 }
3386 }
3387 /* Mark that a file lock has been acquired. */
3388 NFSLOCKNODE(np);
3389 np->n_flag |= NHASBEENLOCKED;
3390 NFSUNLOCKNODE(np);
3391 }
3392 } else
3393 error = EOPNOTSUPP;
3394 out:
3395 NFSVOPUNLOCK(vp);
3396 return (error);
3397 }
3398
3399 /*
3400 * NFS advisory byte-level locks.
3401 */
3402 static int
nfs_advlockasync(struct vop_advlockasync_args * ap)3403 nfs_advlockasync(struct vop_advlockasync_args *ap)
3404 {
3405 struct vnode *vp = ap->a_vp;
3406 u_quad_t size;
3407 int error;
3408
3409 error = NFSVOPLOCK(vp, LK_SHARED);
3410 if (error)
3411 return (error);
3412 if (NFS_ISV4(vp)) {
3413 NFSVOPUNLOCK(vp);
3414 return (EOPNOTSUPP);
3415 }
3416 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
3417 size = VTONFS(vp)->n_size;
3418 NFSVOPUNLOCK(vp);
3419 error = lf_advlockasync(ap, &(vp->v_lockf), size);
3420 } else {
3421 NFSVOPUNLOCK(vp);
3422 error = EOPNOTSUPP;
3423 }
3424 return (error);
3425 }
3426
3427 /*
3428 * Print out the contents of an nfsnode.
3429 */
3430 static int
nfs_print(struct vop_print_args * ap)3431 nfs_print(struct vop_print_args *ap)
3432 {
3433 struct vnode *vp = ap->a_vp;
3434 struct nfsnode *np = VTONFS(vp);
3435
3436 printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid,
3437 (uintmax_t)np->n_vattr.na_fsid);
3438 if (vp->v_type == VFIFO)
3439 fifo_printinfo(vp);
3440 printf("\n");
3441 return (0);
3442 }
3443
3444 /*
3445 * nfs special file access vnode op.
3446 * Essentially just get vattr and then imitate iaccess() since the device is
3447 * local to the client.
3448 */
3449 static int
nfsspec_access(struct vop_access_args * ap)3450 nfsspec_access(struct vop_access_args *ap)
3451 {
3452 struct vattr *vap;
3453 struct ucred *cred = ap->a_cred;
3454 struct vnode *vp = ap->a_vp;
3455 accmode_t accmode = ap->a_accmode;
3456 struct vattr vattr;
3457 int error;
3458
3459 /*
3460 * Disallow write attempts on filesystems mounted read-only;
3461 * unless the file is a socket, fifo, or a block or character
3462 * device resident on the filesystem.
3463 */
3464 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
3465 switch (vp->v_type) {
3466 case VREG:
3467 case VDIR:
3468 case VLNK:
3469 return (EROFS);
3470 default:
3471 break;
3472 }
3473 }
3474 vap = &vattr;
3475 error = VOP_GETATTR(vp, vap, cred);
3476 if (error)
3477 goto out;
3478 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
3479 accmode, cred);
3480 out:
3481 return error;
3482 }
3483
3484 /*
3485 * Read wrapper for fifos.
3486 */
3487 static int
nfsfifo_read(struct vop_read_args * ap)3488 nfsfifo_read(struct vop_read_args *ap)
3489 {
3490 struct nfsnode *np = VTONFS(ap->a_vp);
3491 int error;
3492
3493 /*
3494 * Set access flag.
3495 */
3496 NFSLOCKNODE(np);
3497 np->n_flag |= NACC;
3498 vfs_timestamp(&np->n_atim);
3499 NFSUNLOCKNODE(np);
3500 error = fifo_specops.vop_read(ap);
3501 return error;
3502 }
3503
3504 /*
3505 * Write wrapper for fifos.
3506 */
3507 static int
nfsfifo_write(struct vop_write_args * ap)3508 nfsfifo_write(struct vop_write_args *ap)
3509 {
3510 struct nfsnode *np = VTONFS(ap->a_vp);
3511
3512 /*
3513 * Set update flag.
3514 */
3515 NFSLOCKNODE(np);
3516 np->n_flag |= NUPD;
3517 vfs_timestamp(&np->n_mtim);
3518 NFSUNLOCKNODE(np);
3519 return(fifo_specops.vop_write(ap));
3520 }
3521
3522 /*
3523 * Close wrapper for fifos.
3524 *
3525 * Update the times on the nfsnode then do fifo close.
3526 */
3527 static int
nfsfifo_close(struct vop_close_args * ap)3528 nfsfifo_close(struct vop_close_args *ap)
3529 {
3530 struct vnode *vp = ap->a_vp;
3531 struct nfsnode *np = VTONFS(vp);
3532 struct vattr vattr;
3533 struct timespec ts;
3534
3535 NFSLOCKNODE(np);
3536 if (np->n_flag & (NACC | NUPD)) {
3537 vfs_timestamp(&ts);
3538 if (np->n_flag & NACC)
3539 np->n_atim = ts;
3540 if (np->n_flag & NUPD)
3541 np->n_mtim = ts;
3542 np->n_flag |= NCHG;
3543 if (vrefcnt(vp) == 1 &&
3544 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
3545 VATTR_NULL(&vattr);
3546 if (np->n_flag & NACC)
3547 vattr.va_atime = np->n_atim;
3548 if (np->n_flag & NUPD)
3549 vattr.va_mtime = np->n_mtim;
3550 NFSUNLOCKNODE(np);
3551 (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
3552 goto out;
3553 }
3554 }
3555 NFSUNLOCKNODE(np);
3556 out:
3557 return (fifo_specops.vop_close(ap));
3558 }
3559
3560 static int
nfs_getacl(struct vop_getacl_args * ap)3561 nfs_getacl(struct vop_getacl_args *ap)
3562 {
3563 int error;
3564
3565 if (ap->a_type != ACL_TYPE_NFS4)
3566 return (EOPNOTSUPP);
3567 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
3568 NULL);
3569 if (error > NFSERR_STALE) {
3570 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3571 error = EPERM;
3572 }
3573 return (error);
3574 }
3575
3576 static int
nfs_setacl(struct vop_setacl_args * ap)3577 nfs_setacl(struct vop_setacl_args *ap)
3578 {
3579 int error;
3580
3581 if (ap->a_type != ACL_TYPE_NFS4)
3582 return (EOPNOTSUPP);
3583 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
3584 NULL);
3585 if (error > NFSERR_STALE) {
3586 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3587 error = EPERM;
3588 }
3589 return (error);
3590 }
3591
3592 /*
3593 * VOP_ADVISE for NFS.
3594 * Just return 0 for any errors, since it is just a hint.
3595 */
3596 static int
nfs_advise(struct vop_advise_args * ap)3597 nfs_advise(struct vop_advise_args *ap)
3598 {
3599 struct thread *td = curthread;
3600 struct nfsmount *nmp;
3601 uint64_t len;
3602 int error;
3603
3604 /*
3605 * First do vop_stdadvise() to handle the buffer cache.
3606 */
3607 error = vop_stdadvise(ap);
3608 if (error != 0)
3609 return (error);
3610 if (ap->a_start < 0 || ap->a_end < 0)
3611 return (0);
3612 if (ap->a_end == OFF_MAX)
3613 len = 0;
3614 else if (ap->a_end < ap->a_start)
3615 return (0);
3616 else
3617 len = ap->a_end - ap->a_start + 1;
3618 nmp = VFSTONFS(ap->a_vp->v_mount);
3619 mtx_lock(&nmp->nm_mtx);
3620 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
3621 (NFSHASPNFS(nmp) && (nmp->nm_privflag & NFSMNTP_IOADVISETHRUMDS) ==
3622 0) || (nmp->nm_privflag & NFSMNTP_NOADVISE) != 0) {
3623 mtx_unlock(&nmp->nm_mtx);
3624 return (0);
3625 }
3626 mtx_unlock(&nmp->nm_mtx);
3627 error = nfsrpc_advise(ap->a_vp, ap->a_start, len, ap->a_advice,
3628 td->td_ucred, td);
3629 if (error == NFSERR_NOTSUPP) {
3630 mtx_lock(&nmp->nm_mtx);
3631 nmp->nm_privflag |= NFSMNTP_NOADVISE;
3632 mtx_unlock(&nmp->nm_mtx);
3633 }
3634 return (0);
3635 }
3636
3637 /*
3638 * nfs allocate call
3639 */
3640 static int
nfs_allocate(struct vop_allocate_args * ap)3641 nfs_allocate(struct vop_allocate_args *ap)
3642 {
3643 struct vnode *vp = ap->a_vp;
3644 struct thread *td = curthread;
3645 struct nfsvattr nfsva;
3646 struct nfsmount *nmp;
3647 struct nfsnode *np;
3648 off_t alen;
3649 int attrflag, error, ret;
3650 struct timespec ts;
3651 struct uio io;
3652
3653 attrflag = 0;
3654 nmp = VFSTONFS(vp->v_mount);
3655 np = VTONFS(vp);
3656 mtx_lock(&nmp->nm_mtx);
3657 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION &&
3658 (nmp->nm_privflag & NFSMNTP_NOALLOCATE) == 0) {
3659 mtx_unlock(&nmp->nm_mtx);
3660 alen = *ap->a_len;
3661 if ((uint64_t)alen > nfs_maxalloclen)
3662 alen = nfs_maxalloclen;
3663
3664 /* Check the file size limit. */
3665 io.uio_offset = *ap->a_offset;
3666 io.uio_resid = alen;
3667 error = vn_rlimit_fsize(vp, &io, td);
3668
3669 /*
3670 * Flush first to ensure that the allocate adds to the
3671 * file's allocation on the server.
3672 */
3673 if (error == 0) {
3674 vnode_pager_clean_sync(vp);
3675 error = ncl_flush(vp, MNT_WAIT, td, 1, 0);
3676 }
3677 if (error == 0)
3678 error = nfsrpc_allocate(vp, *ap->a_offset, alen,
3679 &nfsva, &attrflag, ap->a_cred, td, NULL);
3680 if (error == 0) {
3681 *ap->a_offset += alen;
3682 *ap->a_len -= alen;
3683 nanouptime(&ts);
3684 NFSLOCKNODE(np);
3685 np->n_localmodtime = ts;
3686 NFSUNLOCKNODE(np);
3687 } else if (error == NFSERR_NOTSUPP) {
3688 mtx_lock(&nmp->nm_mtx);
3689 nmp->nm_privflag |= NFSMNTP_NOALLOCATE;
3690 mtx_unlock(&nmp->nm_mtx);
3691 error = EINVAL;
3692 }
3693 } else {
3694 mtx_unlock(&nmp->nm_mtx);
3695 error = EINVAL;
3696 }
3697 if (attrflag != 0) {
3698 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
3699 if (error == 0 && ret != 0)
3700 error = ret;
3701 }
3702 if (error != 0)
3703 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
3704 return (error);
3705 }
3706
3707 /*
3708 * nfs copy_file_range call
3709 */
3710 static int
nfs_copy_file_range(struct vop_copy_file_range_args * ap)3711 nfs_copy_file_range(struct vop_copy_file_range_args *ap)
3712 {
3713 struct vnode *invp = ap->a_invp;
3714 struct vnode *outvp = ap->a_outvp;
3715 struct mount *mp;
3716 vm_object_t invp_obj;
3717 struct nfsvattr innfsva, outnfsva;
3718 struct vattr *vap;
3719 struct uio io;
3720 struct nfsmount *nmp;
3721 size_t len, len2;
3722 ssize_t r;
3723 int error, inattrflag, outattrflag, ret, ret2, invp_lock;
3724 off_t inoff, outoff;
3725 bool consecutive, must_commit, tryoutcred;
3726
3727 /* NFSv4.2 Copy is not permitted for infile == outfile. */
3728 if (invp == outvp) {
3729 generic_copy:
3730 return (ENOSYS);
3731 }
3732
3733 invp_lock = LK_SHARED;
3734 relock:
3735
3736 /* Lock both vnodes, avoiding risk of deadlock. */
3737 do {
3738 mp = NULL;
3739 error = vn_start_write(outvp, &mp, V_WAIT);
3740 if (error == 0) {
3741 error = vn_lock(outvp, LK_EXCLUSIVE);
3742 if (error == 0) {
3743 error = vn_lock(invp, invp_lock | LK_NOWAIT);
3744 if (error == 0)
3745 break;
3746 VOP_UNLOCK(outvp);
3747 if (mp != NULL)
3748 vn_finished_write(mp);
3749 mp = NULL;
3750 error = vn_lock(invp, invp_lock);
3751 if (error == 0)
3752 VOP_UNLOCK(invp);
3753 }
3754 }
3755 if (mp != NULL)
3756 vn_finished_write(mp);
3757 } while (error == 0);
3758 if (error != 0)
3759 return (error);
3760
3761 /*
3762 * More reasons to avoid nfs copy: not NFSv4.2, or explicitly
3763 * disabled.
3764 */
3765 nmp = VFSTONFS(invp->v_mount);
3766 mtx_lock(&nmp->nm_mtx);
3767 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
3768 (nmp->nm_privflag & NFSMNTP_NOCOPY) != 0) {
3769 mtx_unlock(&nmp->nm_mtx);
3770 VOP_UNLOCK(invp);
3771 VOP_UNLOCK(outvp);
3772 if (mp != NULL)
3773 vn_finished_write(mp);
3774 goto generic_copy;
3775 }
3776 mtx_unlock(&nmp->nm_mtx);
3777
3778 /*
3779 * Do the vn_rlimit_fsize() check. Should this be above the VOP layer?
3780 */
3781 io.uio_offset = *ap->a_outoffp;
3782 io.uio_resid = *ap->a_lenp;
3783 error = vn_rlimit_fsizex(outvp, &io, 0, &r, ap->a_fsizetd);
3784 *ap->a_lenp = io.uio_resid;
3785 /*
3786 * No need to call vn_rlimit_fsizex_res before return, since the uio is
3787 * local.
3788 */
3789
3790 /*
3791 * Flush the input file so that the data is up to date before
3792 * the copy. Flush writes for the output file so that they
3793 * do not overwrite the data copied to the output file by the Copy.
3794 * Set the commit argument for both flushes so that the data is on
3795 * stable storage before the Copy RPC. This is done in case the
3796 * server reboots during the Copy and needs to be redone.
3797 */
3798 if (error == 0) {
3799 invp_obj = invp->v_object;
3800 if (invp_obj != NULL && vm_object_mightbedirty(invp_obj)) {
3801 if (invp_lock != LK_EXCLUSIVE) {
3802 invp_lock = LK_EXCLUSIVE;
3803 VOP_UNLOCK(invp);
3804 VOP_UNLOCK(outvp);
3805 if (mp != NULL)
3806 vn_finished_write(mp);
3807 goto relock;
3808 }
3809 vnode_pager_clean_sync(invp);
3810 }
3811 error = ncl_flush(invp, MNT_WAIT, curthread, 1, 0);
3812 }
3813 if (error == 0)
3814 error = ncl_vinvalbuf(outvp, V_SAVE, curthread, 0);
3815
3816 /* Do the actual NFSv4.2 RPC. */
3817 ret = ret2 = 0;
3818 len = *ap->a_lenp;
3819 mtx_lock(&nmp->nm_mtx);
3820 if ((nmp->nm_privflag & NFSMNTP_NOCONSECUTIVE) == 0)
3821 consecutive = true;
3822 else
3823 consecutive = false;
3824 mtx_unlock(&nmp->nm_mtx);
3825 inoff = *ap->a_inoffp;
3826 outoff = *ap->a_outoffp;
3827 tryoutcred = true;
3828 must_commit = false;
3829 if (error == 0) {
3830 vap = &VTONFS(invp)->n_vattr.na_vattr;
3831 error = VOP_GETATTR(invp, vap, ap->a_incred);
3832 if (error == 0) {
3833 /*
3834 * Clip "len" at va_size so that RFC compliant servers
3835 * will not reply NFSERR_INVAL.
3836 * Setting "len == 0" for the RPC would be preferred,
3837 * but some Linux servers do not support that.
3838 */
3839 if (inoff >= vap->va_size)
3840 *ap->a_lenp = len = 0;
3841 else if (inoff + len > vap->va_size)
3842 *ap->a_lenp = len = vap->va_size - inoff;
3843 } else
3844 error = 0;
3845 }
3846
3847 /*
3848 * len will be set to 0 upon a successful Copy RPC.
3849 * As such, this only loops when the Copy RPC needs to be retried.
3850 */
3851 while (len > 0 && error == 0) {
3852 inattrflag = outattrflag = 0;
3853 len2 = len;
3854 if (tryoutcred)
3855 error = nfsrpc_copy_file_range(invp, ap->a_inoffp,
3856 outvp, ap->a_outoffp, &len2, ap->a_flags,
3857 &inattrflag, &innfsva, &outattrflag, &outnfsva,
3858 ap->a_outcred, consecutive, &must_commit);
3859 else
3860 error = nfsrpc_copy_file_range(invp, ap->a_inoffp,
3861 outvp, ap->a_outoffp, &len2, ap->a_flags,
3862 &inattrflag, &innfsva, &outattrflag, &outnfsva,
3863 ap->a_incred, consecutive, &must_commit);
3864 if (inattrflag != 0)
3865 ret = nfscl_loadattrcache(&invp, &innfsva, NULL, NULL,
3866 0, 1);
3867 if (outattrflag != 0)
3868 ret2 = nfscl_loadattrcache(&outvp, &outnfsva, NULL,
3869 NULL, 1, 1);
3870 if (error == 0) {
3871 if (consecutive == false) {
3872 if (len2 == len) {
3873 mtx_lock(&nmp->nm_mtx);
3874 nmp->nm_privflag |=
3875 NFSMNTP_NOCONSECUTIVE;
3876 mtx_unlock(&nmp->nm_mtx);
3877 } else
3878 error = NFSERR_OFFLOADNOREQS;
3879 }
3880 *ap->a_lenp = len2;
3881 len = 0;
3882 if (len2 > 0 && must_commit && error == 0)
3883 error = ncl_commit(outvp, outoff, *ap->a_lenp,
3884 ap->a_outcred, curthread);
3885 if (error == 0 && ret != 0)
3886 error = ret;
3887 if (error == 0 && ret2 != 0)
3888 error = ret2;
3889 } else if (error == NFSERR_OFFLOADNOREQS && consecutive) {
3890 /*
3891 * Try consecutive == false, which is ok only if all
3892 * bytes are copied.
3893 * If only some bytes were copied when consecutive
3894 * is false, there is no way to know which bytes
3895 * still need to be written.
3896 */
3897 consecutive = false;
3898 error = 0;
3899 } else if (error == NFSERR_ACCES && tryoutcred) {
3900 /* Try again with incred. */
3901 tryoutcred = false;
3902 error = 0;
3903 }
3904 if (error == NFSERR_STALEWRITEVERF) {
3905 /*
3906 * Server rebooted, so do it all again.
3907 */
3908 *ap->a_inoffp = inoff;
3909 *ap->a_outoffp = outoff;
3910 len = *ap->a_lenp;
3911 must_commit = false;
3912 error = 0;
3913 }
3914 }
3915 VOP_UNLOCK(invp);
3916 VOP_UNLOCK(outvp);
3917 if (mp != NULL)
3918 vn_finished_write(mp);
3919 if (error == NFSERR_NOTSUPP || error == NFSERR_OFFLOADNOREQS ||
3920 error == NFSERR_ACCES) {
3921 /*
3922 * Unlike the NFSv4.2 Copy, vn_generic_copy_file_range() can
3923 * use a_incred for the read and a_outcred for the write, so
3924 * try this for NFSERR_ACCES failures for the Copy.
3925 * For NFSERR_NOTSUPP and NFSERR_OFFLOADNOREQS, the Copy can
3926 * never succeed, so disable it.
3927 */
3928 if (error != NFSERR_ACCES) {
3929 /* Can never do Copy on this mount. */
3930 mtx_lock(&nmp->nm_mtx);
3931 nmp->nm_privflag |= NFSMNTP_NOCOPY;
3932 mtx_unlock(&nmp->nm_mtx);
3933 }
3934 *ap->a_inoffp = inoff;
3935 *ap->a_outoffp = outoff;
3936 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp,
3937 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags,
3938 ap->a_incred, ap->a_outcred, ap->a_fsizetd);
3939 } else if (error != 0)
3940 *ap->a_lenp = 0;
3941
3942 if (error != 0)
3943 error = nfscl_maperr(curthread, error, (uid_t)0, (gid_t)0);
3944 return (error);
3945 }
3946
3947 /*
3948 * nfs ioctl call
3949 */
3950 static int
nfs_ioctl(struct vop_ioctl_args * ap)3951 nfs_ioctl(struct vop_ioctl_args *ap)
3952 {
3953 struct vnode *vp = ap->a_vp;
3954 struct nfsvattr nfsva;
3955 struct nfsmount *nmp;
3956 int attrflag, content, error, ret;
3957 bool eof = false; /* shut up compiler. */
3958
3959 /* Do the actual NFSv4.2 RPC. */
3960 switch (ap->a_command) {
3961 case FIOSEEKDATA:
3962 content = NFSV4CONTENT_DATA;
3963 break;
3964 case FIOSEEKHOLE:
3965 content = NFSV4CONTENT_HOLE;
3966 break;
3967 default:
3968 return (ENOTTY);
3969 }
3970
3971 error = vn_lock(vp, LK_EXCLUSIVE);
3972 if (error != 0)
3973 return (EBADF);
3974
3975 if (vp->v_type != VREG) {
3976 VOP_UNLOCK(vp);
3977 return (ENOTTY);
3978 }
3979 nmp = VFSTONFS(vp->v_mount);
3980 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION) {
3981 VOP_UNLOCK(vp);
3982 error = vop_stdioctl(ap);
3983 return (error);
3984 }
3985
3986 attrflag = 0;
3987 if (*((off_t *)ap->a_data) >= VTONFS(vp)->n_size)
3988 error = ENXIO;
3989 else {
3990 /*
3991 * Flush all writes, so that the server is up to date.
3992 * Although a Commit is not required, the commit argument
3993 * is set so that, for a pNFS File/Flexible File Layout
3994 * server, the LayoutCommit will be done to ensure the file
3995 * size is up to date on the Metadata Server.
3996 */
3997
3998 vnode_pager_clean_sync(vp);
3999 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 1, 0);
4000 if (error == 0)
4001 error = nfsrpc_seek(vp, (off_t *)ap->a_data, &eof,
4002 content, ap->a_cred, &nfsva, &attrflag);
4003 /* If at eof for FIOSEEKDATA, return ENXIO. */
4004 if (eof && error == 0 && content == NFSV4CONTENT_DATA)
4005 error = ENXIO;
4006 }
4007 if (attrflag != 0) {
4008 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
4009 if (error == 0 && ret != 0)
4010 error = ret;
4011 }
4012 NFSVOPUNLOCK(vp);
4013
4014 if (error != 0)
4015 error = ENXIO;
4016 return (error);
4017 }
4018
4019 /*
4020 * nfs getextattr call
4021 */
4022 static int
nfs_getextattr(struct vop_getextattr_args * ap)4023 nfs_getextattr(struct vop_getextattr_args *ap)
4024 {
4025 struct vnode *vp = ap->a_vp;
4026 struct nfsmount *nmp;
4027 struct ucred *cred;
4028 struct thread *td = ap->a_td;
4029 struct nfsvattr nfsva;
4030 ssize_t len;
4031 int attrflag, error, ret;
4032
4033 nmp = VFSTONFS(vp->v_mount);
4034 mtx_lock(&nmp->nm_mtx);
4035 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4036 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4037 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4038 mtx_unlock(&nmp->nm_mtx);
4039 return (EOPNOTSUPP);
4040 }
4041 mtx_unlock(&nmp->nm_mtx);
4042
4043 cred = ap->a_cred;
4044 if (cred == NULL)
4045 cred = td->td_ucred;
4046 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
4047 attrflag = 0;
4048 error = nfsrpc_getextattr(vp, ap->a_name, ap->a_uio, &len, &nfsva,
4049 &attrflag, cred, td);
4050 if (attrflag != 0) {
4051 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
4052 if (error == 0 && ret != 0)
4053 error = ret;
4054 }
4055 if (error == 0 && ap->a_size != NULL)
4056 *ap->a_size = len;
4057
4058 switch (error) {
4059 case NFSERR_NOTSUPP:
4060 case NFSERR_OPILLEGAL:
4061 mtx_lock(&nmp->nm_mtx);
4062 nmp->nm_privflag |= NFSMNTP_NOXATTR;
4063 mtx_unlock(&nmp->nm_mtx);
4064 error = EOPNOTSUPP;
4065 break;
4066 case NFSERR_NOXATTR:
4067 case NFSERR_XATTR2BIG:
4068 error = ENOATTR;
4069 break;
4070 default:
4071 error = nfscl_maperr(td, error, 0, 0);
4072 break;
4073 }
4074 return (error);
4075 }
4076
4077 /*
4078 * nfs setextattr call
4079 */
4080 static int
nfs_setextattr(struct vop_setextattr_args * ap)4081 nfs_setextattr(struct vop_setextattr_args *ap)
4082 {
4083 struct vnode *vp = ap->a_vp;
4084 struct nfsmount *nmp;
4085 struct ucred *cred;
4086 struct thread *td = ap->a_td;
4087 struct nfsvattr nfsva;
4088 int attrflag, error, ret;
4089
4090 nmp = VFSTONFS(vp->v_mount);
4091 mtx_lock(&nmp->nm_mtx);
4092 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4093 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4094 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4095 mtx_unlock(&nmp->nm_mtx);
4096 return (EOPNOTSUPP);
4097 }
4098 mtx_unlock(&nmp->nm_mtx);
4099
4100 if (ap->a_uio->uio_resid < 0)
4101 return (EINVAL);
4102 cred = ap->a_cred;
4103 if (cred == NULL)
4104 cred = td->td_ucred;
4105 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
4106 attrflag = 0;
4107 error = nfsrpc_setextattr(vp, ap->a_name, ap->a_uio, &nfsva,
4108 &attrflag, cred, td);
4109 if (attrflag != 0) {
4110 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
4111 if (error == 0 && ret != 0)
4112 error = ret;
4113 }
4114
4115 switch (error) {
4116 case NFSERR_NOTSUPP:
4117 case NFSERR_OPILLEGAL:
4118 mtx_lock(&nmp->nm_mtx);
4119 nmp->nm_privflag |= NFSMNTP_NOXATTR;
4120 mtx_unlock(&nmp->nm_mtx);
4121 error = EOPNOTSUPP;
4122 break;
4123 case NFSERR_NOXATTR:
4124 case NFSERR_XATTR2BIG:
4125 error = ENOATTR;
4126 break;
4127 default:
4128 error = nfscl_maperr(td, error, 0, 0);
4129 break;
4130 }
4131 return (error);
4132 }
4133
4134 /*
4135 * nfs listextattr call
4136 */
4137 static int
nfs_listextattr(struct vop_listextattr_args * ap)4138 nfs_listextattr(struct vop_listextattr_args *ap)
4139 {
4140 struct vnode *vp = ap->a_vp;
4141 struct nfsmount *nmp;
4142 struct ucred *cred;
4143 struct thread *td = ap->a_td;
4144 struct nfsvattr nfsva;
4145 size_t len, len2;
4146 uint64_t cookie;
4147 int attrflag, error, ret;
4148 bool eof;
4149
4150 nmp = VFSTONFS(vp->v_mount);
4151 mtx_lock(&nmp->nm_mtx);
4152 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4153 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4154 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4155 mtx_unlock(&nmp->nm_mtx);
4156 return (EOPNOTSUPP);
4157 }
4158 mtx_unlock(&nmp->nm_mtx);
4159
4160 cred = ap->a_cred;
4161 if (cred == NULL)
4162 cred = td->td_ucred;
4163
4164 /* Loop around doing List Extended Attribute RPCs. */
4165 eof = false;
4166 cookie = 0;
4167 len2 = 0;
4168 error = 0;
4169 while (!eof && error == 0) {
4170 len = nmp->nm_rsize;
4171 attrflag = 0;
4172 error = nfsrpc_listextattr(vp, &cookie, ap->a_uio, &len, &eof,
4173 &nfsva, &attrflag, cred, td);
4174 if (attrflag != 0) {
4175 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
4176 1);
4177 if (error == 0 && ret != 0)
4178 error = ret;
4179 }
4180 if (error == 0) {
4181 len2 += len;
4182 if (len2 > SSIZE_MAX)
4183 error = ENOATTR;
4184 }
4185 }
4186 if (error == 0 && ap->a_size != NULL)
4187 *ap->a_size = len2;
4188
4189 switch (error) {
4190 case NFSERR_NOTSUPP:
4191 case NFSERR_OPILLEGAL:
4192 mtx_lock(&nmp->nm_mtx);
4193 nmp->nm_privflag |= NFSMNTP_NOXATTR;
4194 mtx_unlock(&nmp->nm_mtx);
4195 error = EOPNOTSUPP;
4196 break;
4197 case NFSERR_NOXATTR:
4198 case NFSERR_XATTR2BIG:
4199 error = ENOATTR;
4200 break;
4201 default:
4202 error = nfscl_maperr(td, error, 0, 0);
4203 break;
4204 }
4205 return (error);
4206 }
4207
4208 /*
4209 * nfs setextattr call
4210 */
4211 static int
nfs_deleteextattr(struct vop_deleteextattr_args * ap)4212 nfs_deleteextattr(struct vop_deleteextattr_args *ap)
4213 {
4214 struct vnode *vp = ap->a_vp;
4215 struct nfsmount *nmp;
4216 struct nfsvattr nfsva;
4217 int attrflag, error, ret;
4218
4219 nmp = VFSTONFS(vp->v_mount);
4220 mtx_lock(&nmp->nm_mtx);
4221 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4222 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4223 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4224 mtx_unlock(&nmp->nm_mtx);
4225 return (EOPNOTSUPP);
4226 }
4227 mtx_unlock(&nmp->nm_mtx);
4228
4229 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
4230 attrflag = 0;
4231 error = nfsrpc_rmextattr(vp, ap->a_name, &nfsva, &attrflag, ap->a_cred,
4232 ap->a_td);
4233 if (attrflag != 0) {
4234 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
4235 if (error == 0 && ret != 0)
4236 error = ret;
4237 }
4238
4239 switch (error) {
4240 case NFSERR_NOTSUPP:
4241 case NFSERR_OPILLEGAL:
4242 mtx_lock(&nmp->nm_mtx);
4243 nmp->nm_privflag |= NFSMNTP_NOXATTR;
4244 mtx_unlock(&nmp->nm_mtx);
4245 error = EOPNOTSUPP;
4246 break;
4247 case NFSERR_NOXATTR:
4248 case NFSERR_XATTR2BIG:
4249 error = ENOATTR;
4250 break;
4251 default:
4252 error = nfscl_maperr(ap->a_td, error, 0, 0);
4253 break;
4254 }
4255 return (error);
4256 }
4257
4258 /*
4259 * Return POSIX pathconf information applicable to nfs filesystems.
4260 */
4261 static int
nfs_pathconf(struct vop_pathconf_args * ap)4262 nfs_pathconf(struct vop_pathconf_args *ap)
4263 {
4264 struct nfsv3_pathconf pc;
4265 struct nfsvattr nfsva;
4266 struct vnode *vp = ap->a_vp;
4267 struct nfsmount *nmp;
4268 struct thread *td = curthread;
4269 off_t off;
4270 bool eof;
4271 int attrflag, error;
4272
4273 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX ||
4274 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
4275 ap->a_name == _PC_NO_TRUNC)) ||
4276 (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) {
4277 /*
4278 * Since only the above 4 a_names are returned by the NFSv3
4279 * Pathconf RPC, there is no point in doing it for others.
4280 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can
4281 * be used for _PC_NFS4_ACL as well.
4282 */
4283 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva,
4284 &attrflag, NULL);
4285 if (attrflag != 0)
4286 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
4287 1);
4288 if (error != 0)
4289 return (error);
4290 } else {
4291 /*
4292 * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
4293 * just fake them.
4294 */
4295 pc.pc_linkmax = NFS_LINK_MAX;
4296 pc.pc_namemax = NFS_MAXNAMLEN;
4297 pc.pc_notrunc = 1;
4298 pc.pc_chownrestricted = 1;
4299 pc.pc_caseinsensitive = 0;
4300 pc.pc_casepreserving = 1;
4301 error = 0;
4302 }
4303 switch (ap->a_name) {
4304 case _PC_LINK_MAX:
4305 #ifdef _LP64
4306 *ap->a_retval = pc.pc_linkmax;
4307 #else
4308 *ap->a_retval = MIN(LONG_MAX, pc.pc_linkmax);
4309 #endif
4310 break;
4311 case _PC_NAME_MAX:
4312 *ap->a_retval = pc.pc_namemax;
4313 break;
4314 case _PC_PIPE_BUF:
4315 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO)
4316 *ap->a_retval = PIPE_BUF;
4317 else
4318 error = EINVAL;
4319 break;
4320 case _PC_CHOWN_RESTRICTED:
4321 *ap->a_retval = pc.pc_chownrestricted;
4322 break;
4323 case _PC_NO_TRUNC:
4324 *ap->a_retval = pc.pc_notrunc;
4325 break;
4326 case _PC_ACL_NFS4:
4327 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
4328 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
4329 *ap->a_retval = 1;
4330 else
4331 *ap->a_retval = 0;
4332 break;
4333 case _PC_ACL_PATH_MAX:
4334 if (NFS_ISV4(vp))
4335 *ap->a_retval = ACL_MAX_ENTRIES;
4336 else
4337 *ap->a_retval = 3;
4338 break;
4339 case _PC_PRIO_IO:
4340 *ap->a_retval = 0;
4341 break;
4342 case _PC_SYNC_IO:
4343 *ap->a_retval = 0;
4344 break;
4345 case _PC_ALLOC_SIZE_MIN:
4346 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
4347 break;
4348 case _PC_FILESIZEBITS:
4349 if (NFS_ISV34(vp))
4350 *ap->a_retval = 64;
4351 else
4352 *ap->a_retval = 32;
4353 break;
4354 case _PC_REC_INCR_XFER_SIZE:
4355 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
4356 break;
4357 case _PC_REC_MAX_XFER_SIZE:
4358 *ap->a_retval = -1; /* means ``unlimited'' */
4359 break;
4360 case _PC_REC_MIN_XFER_SIZE:
4361 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
4362 break;
4363 case _PC_REC_XFER_ALIGN:
4364 *ap->a_retval = PAGE_SIZE;
4365 break;
4366 case _PC_SYMLINK_MAX:
4367 *ap->a_retval = NFS_MAXPATHLEN;
4368 break;
4369 case _PC_MIN_HOLE_SIZE:
4370 /* Only some NFSv4.2 servers support Seek for Holes. */
4371 *ap->a_retval = 0;
4372 nmp = VFSTONFS(vp->v_mount);
4373 if (NFS_ISV4(vp) && nmp->nm_minorvers == NFSV42_MINORVERSION) {
4374 /*
4375 * NFSv4.2 doesn't have an attribute for hole size,
4376 * so all we can do is see if the Seek operation is
4377 * supported and then use f_iosize as a "best guess".
4378 */
4379 mtx_lock(&nmp->nm_mtx);
4380 if ((nmp->nm_privflag & NFSMNTP_SEEKTESTED) == 0) {
4381 mtx_unlock(&nmp->nm_mtx);
4382 off = 0;
4383 attrflag = 0;
4384 error = nfsrpc_seek(vp, &off, &eof,
4385 NFSV4CONTENT_HOLE, td->td_ucred, &nfsva,
4386 &attrflag);
4387 if (attrflag != 0)
4388 nfscl_loadattrcache(&vp, &nfsva,
4389 NULL, NULL, 0, 1);
4390 mtx_lock(&nmp->nm_mtx);
4391 if (error == NFSERR_NOTSUPP)
4392 nmp->nm_privflag |= NFSMNTP_SEEKTESTED;
4393 else
4394 nmp->nm_privflag |= NFSMNTP_SEEKTESTED |
4395 NFSMNTP_SEEK;
4396 error = 0;
4397 }
4398 if ((nmp->nm_privflag & NFSMNTP_SEEK) != 0)
4399 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
4400 mtx_unlock(&nmp->nm_mtx);
4401 }
4402 break;
4403
4404 default:
4405 error = vop_stdpathconf(ap);
4406 break;
4407 }
4408 return (error);
4409 }
4410