1 /*-
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * from nfs_vnops.c 8.16 (Berkeley) 5/27/95
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: stable/10/sys/fs/nfsclient/nfs_clvnops.c 340589 2018-11-18 23:48:15Z rmacklem $");
37
38 /*
39 * vnode op calls for Sun NFS version 2, 3 and 4
40 */
41
42 #include "opt_kdtrace.h"
43 #include "opt_inet.h"
44
45 #include <sys/param.h>
46 #include <sys/kernel.h>
47 #include <sys/systm.h>
48 #include <sys/resourcevar.h>
49 #include <sys/proc.h>
50 #include <sys/mount.h>
51 #include <sys/bio.h>
52 #include <sys/buf.h>
53 #include <sys/jail.h>
54 #include <sys/malloc.h>
55 #include <sys/mbuf.h>
56 #include <sys/namei.h>
57 #include <sys/socket.h>
58 #include <sys/vnode.h>
59 #include <sys/dirent.h>
60 #include <sys/fcntl.h>
61 #include <sys/lockf.h>
62 #include <sys/stat.h>
63 #include <sys/sysctl.h>
64 #include <sys/signalvar.h>
65
66 #include <vm/vm.h>
67 #include <vm/vm_extern.h>
68 #include <vm/vm_object.h>
69
70 #include <fs/nfs/nfsport.h>
71 #include <fs/nfsclient/nfsnode.h>
72 #include <fs/nfsclient/nfsmount.h>
73 #include <fs/nfsclient/nfs.h>
74 #include <fs/nfsclient/nfs_kdtrace.h>
75
76 #include <net/if.h>
77 #include <netinet/in.h>
78 #include <netinet/in_var.h>
79
80 #include <nfs/nfs_lock.h>
81
82 #ifdef KDTRACE_HOOKS
83 #include <sys/dtrace_bsd.h>
84
85 dtrace_nfsclient_accesscache_flush_probe_func_t
86 dtrace_nfscl_accesscache_flush_done_probe;
87 uint32_t nfscl_accesscache_flush_done_id;
88
89 dtrace_nfsclient_accesscache_get_probe_func_t
90 dtrace_nfscl_accesscache_get_hit_probe,
91 dtrace_nfscl_accesscache_get_miss_probe;
92 uint32_t nfscl_accesscache_get_hit_id;
93 uint32_t nfscl_accesscache_get_miss_id;
94
95 dtrace_nfsclient_accesscache_load_probe_func_t
96 dtrace_nfscl_accesscache_load_done_probe;
97 uint32_t nfscl_accesscache_load_done_id;
98 #endif /* !KDTRACE_HOOKS */
99
100 /* Defs */
101 #define TRUE 1
102 #define FALSE 0
103
104 extern struct nfsstats newnfsstats;
105 extern int nfsrv_useacl;
106 extern int nfscl_debuglevel;
107 MALLOC_DECLARE(M_NEWNFSREQ);
108
109 /*
110 * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
111 * calls are not in getblk() and brelse() so that they would not be necessary
112 * here.
113 */
114 #ifndef B_VMIO
115 #define vfs_busy_pages(bp, f)
116 #endif
117
118 static vop_read_t nfsfifo_read;
119 static vop_write_t nfsfifo_write;
120 static vop_close_t nfsfifo_close;
121 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
122 struct thread *);
123 static vop_lookup_t nfs_lookup;
124 static vop_create_t nfs_create;
125 static vop_mknod_t nfs_mknod;
126 static vop_open_t nfs_open;
127 static vop_pathconf_t nfs_pathconf;
128 static vop_close_t nfs_close;
129 static vop_access_t nfs_access;
130 static vop_getattr_t nfs_getattr;
131 static vop_setattr_t nfs_setattr;
132 static vop_read_t nfs_read;
133 static vop_fsync_t nfs_fsync;
134 static vop_remove_t nfs_remove;
135 static vop_link_t nfs_link;
136 static vop_rename_t nfs_rename;
137 static vop_mkdir_t nfs_mkdir;
138 static vop_rmdir_t nfs_rmdir;
139 static vop_symlink_t nfs_symlink;
140 static vop_readdir_t nfs_readdir;
141 static vop_strategy_t nfs_strategy;
142 static int nfs_lookitup(struct vnode *, char *, int,
143 struct ucred *, struct thread *, struct nfsnode **);
144 static int nfs_sillyrename(struct vnode *, struct vnode *,
145 struct componentname *);
146 static vop_access_t nfsspec_access;
147 static vop_readlink_t nfs_readlink;
148 static vop_print_t nfs_print;
149 static vop_advlock_t nfs_advlock;
150 static vop_advlockasync_t nfs_advlockasync;
151 static vop_getacl_t nfs_getacl;
152 static vop_setacl_t nfs_setacl;
153 static vop_set_text_t nfs_set_text;
154
155 /*
156 * Global vfs data structures for nfs
157 */
158 struct vop_vector newnfs_vnodeops = {
159 .vop_default = &default_vnodeops,
160 .vop_access = nfs_access,
161 .vop_advlock = nfs_advlock,
162 .vop_advlockasync = nfs_advlockasync,
163 .vop_close = nfs_close,
164 .vop_create = nfs_create,
165 .vop_fsync = nfs_fsync,
166 .vop_getattr = nfs_getattr,
167 .vop_getpages = ncl_getpages,
168 .vop_putpages = ncl_putpages,
169 .vop_inactive = ncl_inactive,
170 .vop_link = nfs_link,
171 .vop_lookup = nfs_lookup,
172 .vop_mkdir = nfs_mkdir,
173 .vop_mknod = nfs_mknod,
174 .vop_open = nfs_open,
175 .vop_pathconf = nfs_pathconf,
176 .vop_print = nfs_print,
177 .vop_read = nfs_read,
178 .vop_readdir = nfs_readdir,
179 .vop_readlink = nfs_readlink,
180 .vop_reclaim = ncl_reclaim,
181 .vop_remove = nfs_remove,
182 .vop_rename = nfs_rename,
183 .vop_rmdir = nfs_rmdir,
184 .vop_setattr = nfs_setattr,
185 .vop_strategy = nfs_strategy,
186 .vop_symlink = nfs_symlink,
187 .vop_write = ncl_write,
188 .vop_getacl = nfs_getacl,
189 .vop_setacl = nfs_setacl,
190 .vop_set_text = nfs_set_text,
191 };
192
193 struct vop_vector newnfs_fifoops = {
194 .vop_default = &fifo_specops,
195 .vop_access = nfsspec_access,
196 .vop_close = nfsfifo_close,
197 .vop_fsync = nfs_fsync,
198 .vop_getattr = nfs_getattr,
199 .vop_inactive = ncl_inactive,
200 .vop_print = nfs_print,
201 .vop_read = nfsfifo_read,
202 .vop_reclaim = ncl_reclaim,
203 .vop_setattr = nfs_setattr,
204 .vop_write = nfsfifo_write,
205 };
206
207 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
208 struct componentname *cnp, struct vattr *vap);
209 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
210 int namelen, struct ucred *cred, struct thread *td);
211 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp,
212 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp,
213 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td);
214 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp,
215 struct componentname *scnp, struct sillyrename *sp);
216
217 /*
218 * Global variables
219 */
220 #define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1))
221
222 SYSCTL_DECL(_vfs_nfs);
223
224 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
225 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
226 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
227
228 static int nfs_prime_access_cache = 0;
229 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
230 &nfs_prime_access_cache, 0,
231 "Prime NFS ACCESS cache when fetching attributes");
232
233 static int newnfs_commit_on_close = 0;
234 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW,
235 &newnfs_commit_on_close, 0, "write+commit on close, else only write");
236
237 static int nfs_clean_pages_on_close = 1;
238 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
239 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
240
241 int newnfs_directio_enable = 0;
242 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
243 &newnfs_directio_enable, 0, "Enable NFS directio");
244
245 int nfs_keep_dirty_on_error;
246 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW,
247 &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned");
248
249 /*
250 * This sysctl allows other processes to mmap a file that has been opened
251 * O_DIRECT by a process. In general, having processes mmap the file while
252 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow
253 * this by default to prevent DoS attacks - to prevent a malicious user from
254 * opening up files O_DIRECT preventing other users from mmap'ing these
255 * files. "Protected" environments where stricter consistency guarantees are
256 * required can disable this knob. The process that opened the file O_DIRECT
257 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
258 * meaningful.
259 */
260 int newnfs_directio_allow_mmap = 1;
261 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
262 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
263
264 #if 0
265 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD,
266 &newnfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
267
268 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD,
269 &newnfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
270 #endif
271
272 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \
273 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \
274 | NFSACCESS_DELETE | NFSACCESS_LOOKUP)
275
276 /*
277 * SMP Locking Note :
278 * The list of locks after the description of the lock is the ordering
279 * of other locks acquired with the lock held.
280 * np->n_mtx : Protects the fields in the nfsnode.
281 VM Object Lock
282 VI_MTX (acquired indirectly)
283 * nmp->nm_mtx : Protects the fields in the nfsmount.
284 rep->r_mtx
285 * ncl_iod_mutex : Global lock, protects shared nfsiod state.
286 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
287 nmp->nm_mtx
288 rep->r_mtx
289 * rep->r_mtx : Protects the fields in an nfsreq.
290 */
291
292 static int
nfs34_access_otw(struct vnode * vp,int wmode,struct thread * td,struct ucred * cred,u_int32_t * retmode)293 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td,
294 struct ucred *cred, u_int32_t *retmode)
295 {
296 int error = 0, attrflag, i, lrupos;
297 u_int32_t rmode;
298 struct nfsnode *np = VTONFS(vp);
299 struct nfsvattr nfsva;
300
301 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag,
302 &rmode, NULL);
303 if (attrflag)
304 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
305 if (!error) {
306 lrupos = 0;
307 mtx_lock(&np->n_mtx);
308 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
309 if (np->n_accesscache[i].uid == cred->cr_uid) {
310 np->n_accesscache[i].mode = rmode;
311 np->n_accesscache[i].stamp = time_second;
312 break;
313 }
314 if (i > 0 && np->n_accesscache[i].stamp <
315 np->n_accesscache[lrupos].stamp)
316 lrupos = i;
317 }
318 if (i == NFS_ACCESSCACHESIZE) {
319 np->n_accesscache[lrupos].uid = cred->cr_uid;
320 np->n_accesscache[lrupos].mode = rmode;
321 np->n_accesscache[lrupos].stamp = time_second;
322 }
323 mtx_unlock(&np->n_mtx);
324 if (retmode != NULL)
325 *retmode = rmode;
326 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0);
327 } else if (NFS_ISV4(vp)) {
328 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
329 }
330 #ifdef KDTRACE_HOOKS
331 if (error != 0)
332 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0,
333 error);
334 #endif
335 return (error);
336 }
337
338 /*
339 * nfs access vnode op.
340 * For nfs version 2, just return ok. File accesses may fail later.
341 * For nfs version 3, use the access rpc to check accessibility. If file modes
342 * are changed on the server, accesses might still fail later.
343 */
344 static int
nfs_access(struct vop_access_args * ap)345 nfs_access(struct vop_access_args *ap)
346 {
347 struct vnode *vp = ap->a_vp;
348 int error = 0, i, gotahit;
349 u_int32_t mode, wmode, rmode;
350 int v34 = NFS_ISV34(vp);
351 struct nfsnode *np = VTONFS(vp);
352
353 /*
354 * Disallow write attempts on filesystems mounted read-only;
355 * unless the file is a socket, fifo, or a block or character
356 * device resident on the filesystem.
357 */
358 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS |
359 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL |
360 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) {
361 switch (vp->v_type) {
362 case VREG:
363 case VDIR:
364 case VLNK:
365 return (EROFS);
366 default:
367 break;
368 }
369 }
370 /*
371 * For nfs v3 or v4, check to see if we have done this recently, and if
372 * so return our cached result instead of making an ACCESS call.
373 * If not, do an access rpc, otherwise you are stuck emulating
374 * ufs_access() locally using the vattr. This may not be correct,
375 * since the server may apply other access criteria such as
376 * client uid-->server uid mapping that we do not know about.
377 */
378 if (v34) {
379 if (ap->a_accmode & VREAD)
380 mode = NFSACCESS_READ;
381 else
382 mode = 0;
383 if (vp->v_type != VDIR) {
384 if (ap->a_accmode & VWRITE)
385 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
386 if (ap->a_accmode & VAPPEND)
387 mode |= NFSACCESS_EXTEND;
388 if (ap->a_accmode & VEXEC)
389 mode |= NFSACCESS_EXECUTE;
390 if (ap->a_accmode & VDELETE)
391 mode |= NFSACCESS_DELETE;
392 } else {
393 if (ap->a_accmode & VWRITE)
394 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
395 if (ap->a_accmode & VAPPEND)
396 mode |= NFSACCESS_EXTEND;
397 if (ap->a_accmode & VEXEC)
398 mode |= NFSACCESS_LOOKUP;
399 if (ap->a_accmode & VDELETE)
400 mode |= NFSACCESS_DELETE;
401 if (ap->a_accmode & VDELETE_CHILD)
402 mode |= NFSACCESS_MODIFY;
403 }
404 /* XXX safety belt, only make blanket request if caching */
405 if (nfsaccess_cache_timeout > 0) {
406 wmode = NFSACCESS_READ | NFSACCESS_MODIFY |
407 NFSACCESS_EXTEND | NFSACCESS_EXECUTE |
408 NFSACCESS_DELETE | NFSACCESS_LOOKUP;
409 } else {
410 wmode = mode;
411 }
412
413 /*
414 * Does our cached result allow us to give a definite yes to
415 * this request?
416 */
417 gotahit = 0;
418 mtx_lock(&np->n_mtx);
419 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
420 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
421 if (time_second < (np->n_accesscache[i].stamp
422 + nfsaccess_cache_timeout) &&
423 (np->n_accesscache[i].mode & mode) == mode) {
424 NFSINCRGLOBAL(newnfsstats.accesscache_hits);
425 gotahit = 1;
426 }
427 break;
428 }
429 }
430 mtx_unlock(&np->n_mtx);
431 #ifdef KDTRACE_HOOKS
432 if (gotahit != 0)
433 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp,
434 ap->a_cred->cr_uid, mode);
435 else
436 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp,
437 ap->a_cred->cr_uid, mode);
438 #endif
439 if (gotahit == 0) {
440 /*
441 * Either a no, or a don't know. Go to the wire.
442 */
443 NFSINCRGLOBAL(newnfsstats.accesscache_misses);
444 error = nfs34_access_otw(vp, wmode, ap->a_td,
445 ap->a_cred, &rmode);
446 if (!error &&
447 (rmode & mode) != mode)
448 error = EACCES;
449 }
450 return (error);
451 } else {
452 if ((error = nfsspec_access(ap)) != 0) {
453 return (error);
454 }
455 /*
456 * Attempt to prevent a mapped root from accessing a file
457 * which it shouldn't. We try to read a byte from the file
458 * if the user is root and the file is not zero length.
459 * After calling nfsspec_access, we should have the correct
460 * file size cached.
461 */
462 mtx_lock(&np->n_mtx);
463 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
464 && VTONFS(vp)->n_size > 0) {
465 struct iovec aiov;
466 struct uio auio;
467 char buf[1];
468
469 mtx_unlock(&np->n_mtx);
470 aiov.iov_base = buf;
471 aiov.iov_len = 1;
472 auio.uio_iov = &aiov;
473 auio.uio_iovcnt = 1;
474 auio.uio_offset = 0;
475 auio.uio_resid = 1;
476 auio.uio_segflg = UIO_SYSSPACE;
477 auio.uio_rw = UIO_READ;
478 auio.uio_td = ap->a_td;
479
480 if (vp->v_type == VREG)
481 error = ncl_readrpc(vp, &auio, ap->a_cred);
482 else if (vp->v_type == VDIR) {
483 char* bp;
484 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
485 aiov.iov_base = bp;
486 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
487 error = ncl_readdirrpc(vp, &auio, ap->a_cred,
488 ap->a_td);
489 free(bp, M_TEMP);
490 } else if (vp->v_type == VLNK)
491 error = ncl_readlinkrpc(vp, &auio, ap->a_cred);
492 else
493 error = EACCES;
494 } else
495 mtx_unlock(&np->n_mtx);
496 return (error);
497 }
498 }
499
500
501 /*
502 * nfs open vnode op
503 * Check to see if the type is ok
504 * and that deletion is not in progress.
505 * For paged in text files, you will need to flush the page cache
506 * if consistency is lost.
507 */
508 /* ARGSUSED */
509 static int
nfs_open(struct vop_open_args * ap)510 nfs_open(struct vop_open_args *ap)
511 {
512 struct vnode *vp = ap->a_vp;
513 struct nfsnode *np = VTONFS(vp);
514 struct vattr vattr;
515 int error;
516 int fmode = ap->a_mode;
517 struct ucred *cred;
518
519 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
520 return (EOPNOTSUPP);
521
522 /*
523 * For NFSv4, we need to do the Open Op before cache validation,
524 * so that we conform to RFC3530 Sec. 9.3.1.
525 */
526 if (NFS_ISV4(vp)) {
527 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);
528 if (error) {
529 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
530 (gid_t)0);
531 return (error);
532 }
533 }
534
535 /*
536 * Now, if this Open will be doing reading, re-validate/flush the
537 * cache, so that Close/Open coherency is maintained.
538 */
539 mtx_lock(&np->n_mtx);
540 if (np->n_flag & NMODIFIED) {
541 mtx_unlock(&np->n_mtx);
542 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
543 if (error == EINTR || error == EIO) {
544 if (NFS_ISV4(vp))
545 (void) nfsrpc_close(vp, 0, ap->a_td);
546 return (error);
547 }
548 mtx_lock(&np->n_mtx);
549 np->n_attrstamp = 0;
550 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
551 if (vp->v_type == VDIR)
552 np->n_direofoffset = 0;
553 mtx_unlock(&np->n_mtx);
554 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
555 if (error) {
556 if (NFS_ISV4(vp))
557 (void) nfsrpc_close(vp, 0, ap->a_td);
558 return (error);
559 }
560 mtx_lock(&np->n_mtx);
561 np->n_mtime = vattr.va_mtime;
562 if (NFS_ISV4(vp))
563 np->n_change = vattr.va_filerev;
564 } else {
565 mtx_unlock(&np->n_mtx);
566 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
567 if (error) {
568 if (NFS_ISV4(vp))
569 (void) nfsrpc_close(vp, 0, ap->a_td);
570 return (error);
571 }
572 mtx_lock(&np->n_mtx);
573 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) ||
574 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
575 if (vp->v_type == VDIR)
576 np->n_direofoffset = 0;
577 mtx_unlock(&np->n_mtx);
578 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
579 if (error == EINTR || error == EIO) {
580 if (NFS_ISV4(vp))
581 (void) nfsrpc_close(vp, 0, ap->a_td);
582 return (error);
583 }
584 mtx_lock(&np->n_mtx);
585 np->n_mtime = vattr.va_mtime;
586 if (NFS_ISV4(vp))
587 np->n_change = vattr.va_filerev;
588 }
589 }
590
591 /*
592 * If the object has >= 1 O_DIRECT active opens, we disable caching.
593 */
594 if (newnfs_directio_enable && (fmode & O_DIRECT) &&
595 (vp->v_type == VREG)) {
596 if (np->n_directio_opens == 0) {
597 mtx_unlock(&np->n_mtx);
598 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
599 if (error) {
600 if (NFS_ISV4(vp))
601 (void) nfsrpc_close(vp, 0, ap->a_td);
602 return (error);
603 }
604 mtx_lock(&np->n_mtx);
605 np->n_flag |= NNONCACHE;
606 }
607 np->n_directio_opens++;
608 }
609
610 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */
611 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0)
612 np->n_flag |= NWRITEOPENED;
613
614 /*
615 * If this is an open for writing, capture a reference to the
616 * credentials, so they can be used by ncl_putpages(). Using
617 * these write credentials is preferable to the credentials of
618 * whatever thread happens to be doing the VOP_PUTPAGES() since
619 * the write RPCs are less likely to fail with EACCES.
620 */
621 if ((fmode & FWRITE) != 0) {
622 cred = np->n_writecred;
623 np->n_writecred = crhold(ap->a_cred);
624 } else
625 cred = NULL;
626 mtx_unlock(&np->n_mtx);
627
628 if (cred != NULL)
629 crfree(cred);
630 vnode_create_vobject(vp, vattr.va_size, ap->a_td);
631 return (0);
632 }
633
634 /*
635 * nfs close vnode op
636 * What an NFS client should do upon close after writing is a debatable issue.
637 * Most NFS clients push delayed writes to the server upon close, basically for
638 * two reasons:
639 * 1 - So that any write errors may be reported back to the client process
640 * doing the close system call. By far the two most likely errors are
641 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
642 * 2 - To put a worst case upper bound on cache inconsistency between
643 * multiple clients for the file.
644 * There is also a consistency problem for Version 2 of the protocol w.r.t.
645 * not being able to tell if other clients are writing a file concurrently,
646 * since there is no way of knowing if the changed modify time in the reply
647 * is only due to the write for this client.
648 * (NFS Version 3 provides weak cache consistency data in the reply that
649 * should be sufficient to detect and handle this case.)
650 *
651 * The current code does the following:
652 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
653 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
654 * or commit them (this satisfies 1 and 2 except for the
655 * case where the server crashes after this close but
656 * before the commit RPC, which is felt to be "good
657 * enough". Changing the last argument to ncl_flush() to
658 * a 1 would force a commit operation, if it is felt a
659 * commit is necessary now.
660 * for NFS Version 4 - flush the dirty buffers and commit them, if
661 * nfscl_mustflush() says this is necessary.
662 * It is necessary if there is no write delegation held,
663 * in order to satisfy open/close coherency.
664 * If the file isn't cached on local stable storage,
665 * it may be necessary in order to detect "out of space"
666 * errors from the server, if the write delegation
667 * issued by the server doesn't allow the file to grow.
668 */
669 /* ARGSUSED */
670 static int
nfs_close(struct vop_close_args * ap)671 nfs_close(struct vop_close_args *ap)
672 {
673 struct vnode *vp = ap->a_vp;
674 struct nfsnode *np = VTONFS(vp);
675 struct nfsvattr nfsva;
676 struct ucred *cred;
677 int error = 0, ret, localcred = 0;
678 int fmode = ap->a_fflag;
679
680 if ((vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF))
681 return (0);
682 /*
683 * During shutdown, a_cred isn't valid, so just use root.
684 */
685 if (ap->a_cred == NOCRED) {
686 cred = newnfs_getcred();
687 localcred = 1;
688 } else {
689 cred = ap->a_cred;
690 }
691 if (vp->v_type == VREG) {
692 /*
693 * Examine and clean dirty pages, regardless of NMODIFIED.
694 * This closes a major hole in close-to-open consistency.
695 * We want to push out all dirty pages (and buffers) on
696 * close, regardless of whether they were dirtied by
697 * mmap'ed writes or via write().
698 */
699 if (nfs_clean_pages_on_close && vp->v_object) {
700 VM_OBJECT_WLOCK(vp->v_object);
701 vm_object_page_clean(vp->v_object, 0, 0, 0);
702 VM_OBJECT_WUNLOCK(vp->v_object);
703 }
704 mtx_lock(&np->n_mtx);
705 if (np->n_flag & NMODIFIED) {
706 mtx_unlock(&np->n_mtx);
707 if (NFS_ISV3(vp)) {
708 /*
709 * Under NFSv3 we have dirty buffers to dispose of. We
710 * must flush them to the NFS server. We have the option
711 * of waiting all the way through the commit rpc or just
712 * waiting for the initial write. The default is to only
713 * wait through the initial write so the data is in the
714 * server's cache, which is roughly similar to the state
715 * a standard disk subsystem leaves the file in on close().
716 *
717 * We cannot clear the NMODIFIED bit in np->n_flag due to
718 * potential races with other processes, and certainly
719 * cannot clear it if we don't commit.
720 * These races occur when there is no longer the old
721 * traditional vnode locking implemented for Vnode Ops.
722 */
723 int cm = newnfs_commit_on_close ? 1 : 0;
724 error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0);
725 /* np->n_flag &= ~NMODIFIED; */
726 } else if (NFS_ISV4(vp)) {
727 if (nfscl_mustflush(vp) != 0) {
728 int cm = newnfs_commit_on_close ? 1 : 0;
729 error = ncl_flush(vp, MNT_WAIT, ap->a_td,
730 cm, 0);
731 /*
732 * as above w.r.t races when clearing
733 * NMODIFIED.
734 * np->n_flag &= ~NMODIFIED;
735 */
736 }
737 } else
738 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
739 mtx_lock(&np->n_mtx);
740 }
741 /*
742 * Invalidate the attribute cache in all cases.
743 * An open is going to fetch fresh attrs any way, other procs
744 * on this node that have file open will be forced to do an
745 * otw attr fetch, but this is safe.
746 * --> A user found that their RPC count dropped by 20% when
747 * this was commented out and I can't see any requirement
748 * for it, so I've disabled it when negative lookups are
749 * enabled. (What does this have to do with negative lookup
750 * caching? Well nothing, except it was reported by the
751 * same user that needed negative lookup caching and I wanted
752 * there to be a way to disable it to see if it
753 * is the cause of some caching/coherency issue that might
754 * crop up.)
755 */
756 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) {
757 np->n_attrstamp = 0;
758 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
759 }
760 if (np->n_flag & NWRITEERR) {
761 np->n_flag &= ~NWRITEERR;
762 error = np->n_error;
763 }
764 mtx_unlock(&np->n_mtx);
765 }
766
767 if (NFS_ISV4(vp)) {
768 /*
769 * Get attributes so "change" is up to date.
770 */
771 if (error == 0 && nfscl_mustflush(vp) != 0 &&
772 vp->v_type == VREG &&
773 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) {
774 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
775 NULL);
776 if (!ret) {
777 np->n_change = nfsva.na_filerev;
778 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
779 NULL, 0, 0);
780 }
781 }
782
783 /*
784 * and do the close.
785 */
786 ret = nfsrpc_close(vp, 0, ap->a_td);
787 if (!error && ret)
788 error = ret;
789 if (error)
790 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
791 (gid_t)0);
792 }
793 if (newnfs_directio_enable)
794 KASSERT((np->n_directio_asyncwr == 0),
795 ("nfs_close: dirty unflushed (%d) directio buffers\n",
796 np->n_directio_asyncwr));
797 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
798 mtx_lock(&np->n_mtx);
799 KASSERT((np->n_directio_opens > 0),
800 ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
801 np->n_directio_opens--;
802 if (np->n_directio_opens == 0)
803 np->n_flag &= ~NNONCACHE;
804 mtx_unlock(&np->n_mtx);
805 }
806 if (localcred)
807 NFSFREECRED(cred);
808 return (error);
809 }
810
811 /*
812 * nfs getattr call from vfs.
813 */
814 static int
nfs_getattr(struct vop_getattr_args * ap)815 nfs_getattr(struct vop_getattr_args *ap)
816 {
817 struct vnode *vp = ap->a_vp;
818 struct thread *td = curthread; /* XXX */
819 struct nfsnode *np = VTONFS(vp);
820 int error = 0;
821 struct nfsvattr nfsva;
822 struct vattr *vap = ap->a_vap;
823 struct vattr vattr;
824
825 /*
826 * Update local times for special files.
827 */
828 mtx_lock(&np->n_mtx);
829 if (np->n_flag & (NACC | NUPD))
830 np->n_flag |= NCHG;
831 mtx_unlock(&np->n_mtx);
832 /*
833 * First look in the cache.
834 */
835 if (ncl_getattrcache(vp, &vattr) == 0) {
836 vap->va_type = vattr.va_type;
837 vap->va_mode = vattr.va_mode;
838 vap->va_nlink = vattr.va_nlink;
839 vap->va_uid = vattr.va_uid;
840 vap->va_gid = vattr.va_gid;
841 vap->va_fsid = vattr.va_fsid;
842 vap->va_fileid = vattr.va_fileid;
843 vap->va_size = vattr.va_size;
844 vap->va_blocksize = vattr.va_blocksize;
845 vap->va_atime = vattr.va_atime;
846 vap->va_mtime = vattr.va_mtime;
847 vap->va_ctime = vattr.va_ctime;
848 vap->va_gen = vattr.va_gen;
849 vap->va_flags = vattr.va_flags;
850 vap->va_rdev = vattr.va_rdev;
851 vap->va_bytes = vattr.va_bytes;
852 vap->va_filerev = vattr.va_filerev;
853 /*
854 * Get the local modify time for the case of a write
855 * delegation.
856 */
857 nfscl_deleggetmodtime(vp, &vap->va_mtime);
858 return (0);
859 }
860
861 if (NFS_ISV34(vp) && nfs_prime_access_cache &&
862 nfsaccess_cache_timeout > 0) {
863 NFSINCRGLOBAL(newnfsstats.accesscache_misses);
864 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
865 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
866 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
867 return (0);
868 }
869 }
870 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
871 if (!error)
872 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0);
873 if (!error) {
874 /*
875 * Get the local modify time for the case of a write
876 * delegation.
877 */
878 nfscl_deleggetmodtime(vp, &vap->va_mtime);
879 } else if (NFS_ISV4(vp)) {
880 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
881 }
882 return (error);
883 }
884
885 /*
886 * nfs setattr call.
887 */
888 static int
nfs_setattr(struct vop_setattr_args * ap)889 nfs_setattr(struct vop_setattr_args *ap)
890 {
891 struct vnode *vp = ap->a_vp;
892 struct nfsnode *np = VTONFS(vp);
893 struct thread *td = curthread; /* XXX */
894 struct vattr *vap = ap->a_vap;
895 int error = 0;
896 u_quad_t tsize;
897
898 #ifndef nolint
899 tsize = (u_quad_t)0;
900 #endif
901
902 /*
903 * Setting of flags and marking of atimes are not supported.
904 */
905 if (vap->va_flags != VNOVAL)
906 return (EOPNOTSUPP);
907
908 /*
909 * Disallow write attempts if the filesystem is mounted read-only.
910 */
911 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
912 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
913 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
914 (vp->v_mount->mnt_flag & MNT_RDONLY))
915 return (EROFS);
916 if (vap->va_size != VNOVAL) {
917 switch (vp->v_type) {
918 case VDIR:
919 return (EISDIR);
920 case VCHR:
921 case VBLK:
922 case VSOCK:
923 case VFIFO:
924 if (vap->va_mtime.tv_sec == VNOVAL &&
925 vap->va_atime.tv_sec == VNOVAL &&
926 vap->va_mode == (mode_t)VNOVAL &&
927 vap->va_uid == (uid_t)VNOVAL &&
928 vap->va_gid == (gid_t)VNOVAL)
929 return (0);
930 vap->va_size = VNOVAL;
931 break;
932 default:
933 /*
934 * Disallow write attempts if the filesystem is
935 * mounted read-only.
936 */
937 if (vp->v_mount->mnt_flag & MNT_RDONLY)
938 return (EROFS);
939 /*
940 * We run vnode_pager_setsize() early (why?),
941 * we must set np->n_size now to avoid vinvalbuf
942 * V_SAVE races that might setsize a lower
943 * value.
944 */
945 mtx_lock(&np->n_mtx);
946 tsize = np->n_size;
947 mtx_unlock(&np->n_mtx);
948 error = ncl_meta_setsize(vp, ap->a_cred, td,
949 vap->va_size);
950 mtx_lock(&np->n_mtx);
951 if (np->n_flag & NMODIFIED) {
952 tsize = np->n_size;
953 mtx_unlock(&np->n_mtx);
954 if (vap->va_size == 0)
955 error = ncl_vinvalbuf(vp, 0, td, 1);
956 else
957 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
958 if (error) {
959 vnode_pager_setsize(vp, tsize);
960 return (error);
961 }
962 /*
963 * Call nfscl_delegmodtime() to set the modify time
964 * locally, as required.
965 */
966 nfscl_delegmodtime(vp);
967 } else
968 mtx_unlock(&np->n_mtx);
969 /*
970 * np->n_size has already been set to vap->va_size
971 * in ncl_meta_setsize(). We must set it again since
972 * nfs_loadattrcache() could be called through
973 * ncl_meta_setsize() and could modify np->n_size.
974 */
975 mtx_lock(&np->n_mtx);
976 np->n_vattr.na_size = np->n_size = vap->va_size;
977 mtx_unlock(&np->n_mtx);
978 };
979 } else {
980 mtx_lock(&np->n_mtx);
981 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) &&
982 (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
983 mtx_unlock(&np->n_mtx);
984 if ((error = ncl_vinvalbuf(vp, V_SAVE, td, 1)) != 0 &&
985 (error == EINTR || error == EIO))
986 return (error);
987 } else
988 mtx_unlock(&np->n_mtx);
989 }
990 error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
991 if (error && vap->va_size != VNOVAL) {
992 mtx_lock(&np->n_mtx);
993 np->n_size = np->n_vattr.na_size = tsize;
994 vnode_pager_setsize(vp, tsize);
995 mtx_unlock(&np->n_mtx);
996 }
997 return (error);
998 }
999
1000 /*
1001 * Do an nfs setattr rpc.
1002 */
1003 static int
nfs_setattrrpc(struct vnode * vp,struct vattr * vap,struct ucred * cred,struct thread * td)1004 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
1005 struct thread *td)
1006 {
1007 struct nfsnode *np = VTONFS(vp);
1008 int error, ret, attrflag, i;
1009 struct nfsvattr nfsva;
1010
1011 if (NFS_ISV34(vp)) {
1012 mtx_lock(&np->n_mtx);
1013 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
1014 np->n_accesscache[i].stamp = 0;
1015 np->n_flag |= NDELEGMOD;
1016 mtx_unlock(&np->n_mtx);
1017 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
1018 }
1019 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
1020 NULL);
1021 if (attrflag) {
1022 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1023 if (ret && !error)
1024 error = ret;
1025 }
1026 if (error && NFS_ISV4(vp))
1027 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
1028 return (error);
1029 }
1030
1031 /*
1032 * nfs lookup call, one step at a time...
1033 * First look in cache
1034 * If not found, unlock the directory nfsnode and do the rpc
1035 */
1036 static int
nfs_lookup(struct vop_lookup_args * ap)1037 nfs_lookup(struct vop_lookup_args *ap)
1038 {
1039 struct componentname *cnp = ap->a_cnp;
1040 struct vnode *dvp = ap->a_dvp;
1041 struct vnode **vpp = ap->a_vpp;
1042 struct mount *mp = dvp->v_mount;
1043 int flags = cnp->cn_flags;
1044 struct vnode *newvp;
1045 struct nfsmount *nmp;
1046 struct nfsnode *np, *newnp;
1047 int error = 0, attrflag, dattrflag, ltype, ncticks;
1048 struct thread *td = cnp->cn_thread;
1049 struct nfsfh *nfhp;
1050 struct nfsvattr dnfsva, nfsva;
1051 struct vattr vattr;
1052 struct timespec nctime;
1053
1054 *vpp = NULLVP;
1055 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
1056 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
1057 return (EROFS);
1058 if (dvp->v_type != VDIR)
1059 return (ENOTDIR);
1060 nmp = VFSTONFS(mp);
1061 np = VTONFS(dvp);
1062
1063 /* For NFSv4, wait until any remove is done. */
1064 mtx_lock(&np->n_mtx);
1065 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
1066 np->n_flag |= NREMOVEWANT;
1067 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
1068 }
1069 mtx_unlock(&np->n_mtx);
1070
1071 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0)
1072 return (error);
1073 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks);
1074 if (error > 0 && error != ENOENT)
1075 return (error);
1076 if (error == -1) {
1077 /*
1078 * Lookups of "." are special and always return the
1079 * current directory. cache_lookup() already handles
1080 * associated locking bookkeeping, etc.
1081 */
1082 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
1083 /* XXX: Is this really correct? */
1084 if (cnp->cn_nameiop != LOOKUP &&
1085 (flags & ISLASTCN))
1086 cnp->cn_flags |= SAVENAME;
1087 return (0);
1088 }
1089
1090 /*
1091 * We only accept a positive hit in the cache if the
1092 * change time of the file matches our cached copy.
1093 * Otherwise, we discard the cache entry and fallback
1094 * to doing a lookup RPC. We also only trust cache
1095 * entries for less than nm_nametimeo seconds.
1096 *
1097 * To better handle stale file handles and attributes,
1098 * clear the attribute cache of this node if it is a
1099 * leaf component, part of an open() call, and not
1100 * locally modified before fetching the attributes.
1101 * This should allow stale file handles to be detected
1102 * here where we can fall back to a LOOKUP RPC to
1103 * recover rather than having nfs_open() detect the
1104 * stale file handle and failing open(2) with ESTALE.
1105 */
1106 newvp = *vpp;
1107 newnp = VTONFS(newvp);
1108 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
1109 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1110 !(newnp->n_flag & NMODIFIED)) {
1111 mtx_lock(&newnp->n_mtx);
1112 newnp->n_attrstamp = 0;
1113 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1114 mtx_unlock(&newnp->n_mtx);
1115 }
1116 if (nfscl_nodeleg(newvp, 0) == 0 ||
1117 ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
1118 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
1119 timespeccmp(&vattr.va_ctime, &nctime, ==))) {
1120 NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
1121 if (cnp->cn_nameiop != LOOKUP &&
1122 (flags & ISLASTCN))
1123 cnp->cn_flags |= SAVENAME;
1124 return (0);
1125 }
1126 cache_purge(newvp);
1127 if (dvp != newvp)
1128 vput(newvp);
1129 else
1130 vrele(newvp);
1131 *vpp = NULLVP;
1132 } else if (error == ENOENT) {
1133 if (dvp->v_iflag & VI_DOOMED)
1134 return (ENOENT);
1135 /*
1136 * We only accept a negative hit in the cache if the
1137 * modification time of the parent directory matches
1138 * the cached copy in the name cache entry.
1139 * Otherwise, we discard all of the negative cache
1140 * entries for this directory. We also only trust
1141 * negative cache entries for up to nm_negnametimeo
1142 * seconds.
1143 */
1144 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
1145 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
1146 timespeccmp(&vattr.va_mtime, &nctime, ==)) {
1147 NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
1148 return (ENOENT);
1149 }
1150 cache_purge_negative(dvp);
1151 }
1152
1153 error = 0;
1154 newvp = NULLVP;
1155 NFSINCRGLOBAL(newnfsstats.lookupcache_misses);
1156 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1157 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1158 NULL);
1159 if (dattrflag)
1160 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1161 if (error) {
1162 if (newvp != NULLVP) {
1163 vput(newvp);
1164 *vpp = NULLVP;
1165 }
1166
1167 if (error != ENOENT) {
1168 if (NFS_ISV4(dvp))
1169 error = nfscl_maperr(td, error, (uid_t)0,
1170 (gid_t)0);
1171 return (error);
1172 }
1173
1174 /* The requested file was not found. */
1175 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
1176 (flags & ISLASTCN)) {
1177 /*
1178 * XXX: UFS does a full VOP_ACCESS(dvp,
1179 * VWRITE) here instead of just checking
1180 * MNT_RDONLY.
1181 */
1182 if (mp->mnt_flag & MNT_RDONLY)
1183 return (EROFS);
1184 cnp->cn_flags |= SAVENAME;
1185 return (EJUSTRETURN);
1186 }
1187
1188 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) {
1189 /*
1190 * Cache the modification time of the parent
1191 * directory from the post-op attributes in
1192 * the name cache entry. The negative cache
1193 * entry will be ignored once the directory
1194 * has changed. Don't bother adding the entry
1195 * if the directory has already changed.
1196 */
1197 mtx_lock(&np->n_mtx);
1198 if (timespeccmp(&np->n_vattr.na_mtime,
1199 &dnfsva.na_mtime, ==)) {
1200 mtx_unlock(&np->n_mtx);
1201 cache_enter_time(dvp, NULL, cnp,
1202 &dnfsva.na_mtime, NULL);
1203 } else
1204 mtx_unlock(&np->n_mtx);
1205 }
1206 return (ENOENT);
1207 }
1208
1209 /*
1210 * Handle RENAME case...
1211 */
1212 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
1213 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1214 FREE((caddr_t)nfhp, M_NFSFH);
1215 return (EISDIR);
1216 }
1217 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1218 LK_EXCLUSIVE);
1219 if (error)
1220 return (error);
1221 newvp = NFSTOV(np);
1222 if (attrflag)
1223 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1224 0, 1);
1225 *vpp = newvp;
1226 cnp->cn_flags |= SAVENAME;
1227 return (0);
1228 }
1229
1230 if (flags & ISDOTDOT) {
1231 ltype = NFSVOPISLOCKED(dvp);
1232 error = vfs_busy(mp, MBF_NOWAIT);
1233 if (error != 0) {
1234 vfs_ref(mp);
1235 NFSVOPUNLOCK(dvp, 0);
1236 error = vfs_busy(mp, 0);
1237 NFSVOPLOCK(dvp, ltype | LK_RETRY);
1238 vfs_rel(mp);
1239 if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
1240 vfs_unbusy(mp);
1241 error = ENOENT;
1242 }
1243 if (error != 0)
1244 return (error);
1245 }
1246 NFSVOPUNLOCK(dvp, 0);
1247 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1248 cnp->cn_lkflags);
1249 if (error == 0)
1250 newvp = NFSTOV(np);
1251 vfs_unbusy(mp);
1252 if (newvp != dvp)
1253 NFSVOPLOCK(dvp, ltype | LK_RETRY);
1254 if (dvp->v_iflag & VI_DOOMED) {
1255 if (error == 0) {
1256 if (newvp == dvp)
1257 vrele(newvp);
1258 else
1259 vput(newvp);
1260 }
1261 error = ENOENT;
1262 }
1263 if (error != 0)
1264 return (error);
1265 if (attrflag)
1266 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1267 0, 1);
1268 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1269 FREE((caddr_t)nfhp, M_NFSFH);
1270 VREF(dvp);
1271 newvp = dvp;
1272 if (attrflag)
1273 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1274 0, 1);
1275 } else {
1276 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1277 cnp->cn_lkflags);
1278 if (error)
1279 return (error);
1280 newvp = NFSTOV(np);
1281 if (attrflag)
1282 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1283 0, 1);
1284 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1285 !(np->n_flag & NMODIFIED)) {
1286 /*
1287 * Flush the attribute cache when opening a
1288 * leaf node to ensure that fresh attributes
1289 * are fetched in nfs_open() since we did not
1290 * fetch attributes from the LOOKUP reply.
1291 */
1292 mtx_lock(&np->n_mtx);
1293 np->n_attrstamp = 0;
1294 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1295 mtx_unlock(&np->n_mtx);
1296 }
1297 }
1298 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
1299 cnp->cn_flags |= SAVENAME;
1300 if ((cnp->cn_flags & MAKEENTRY) &&
1301 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
1302 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
1303 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
1304 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime);
1305 *vpp = newvp;
1306 return (0);
1307 }
1308
1309 /*
1310 * nfs read call.
1311 * Just call ncl_bioread() to do the work.
1312 */
1313 static int
nfs_read(struct vop_read_args * ap)1314 nfs_read(struct vop_read_args *ap)
1315 {
1316 struct vnode *vp = ap->a_vp;
1317
1318 switch (vp->v_type) {
1319 case VREG:
1320 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
1321 case VDIR:
1322 return (EISDIR);
1323 default:
1324 return (EOPNOTSUPP);
1325 }
1326 }
1327
1328 /*
1329 * nfs readlink call
1330 */
1331 static int
nfs_readlink(struct vop_readlink_args * ap)1332 nfs_readlink(struct vop_readlink_args *ap)
1333 {
1334 struct vnode *vp = ap->a_vp;
1335
1336 if (vp->v_type != VLNK)
1337 return (EINVAL);
1338 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
1339 }
1340
1341 /*
1342 * Do a readlink rpc.
1343 * Called by ncl_doio() from below the buffer cache.
1344 */
1345 int
ncl_readlinkrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred)1346 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1347 {
1348 int error, ret, attrflag;
1349 struct nfsvattr nfsva;
1350
1351 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
1352 &attrflag, NULL);
1353 if (attrflag) {
1354 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1355 if (ret && !error)
1356 error = ret;
1357 }
1358 if (error && NFS_ISV4(vp))
1359 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1360 return (error);
1361 }
1362
1363 /*
1364 * nfs read rpc call
1365 * Ditto above
1366 */
1367 int
ncl_readrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred)1368 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1369 {
1370 int error, ret, attrflag;
1371 struct nfsvattr nfsva;
1372 struct nfsmount *nmp;
1373
1374 nmp = VFSTONFS(vnode_mount(vp));
1375 error = EIO;
1376 attrflag = 0;
1377 if (NFSHASPNFS(nmp))
1378 error = nfscl_doiods(vp, uiop, NULL, NULL,
1379 NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td);
1380 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error);
1381 if (error != 0)
1382 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva,
1383 &attrflag, NULL);
1384 if (attrflag) {
1385 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1386 if (ret && !error)
1387 error = ret;
1388 }
1389 if (error && NFS_ISV4(vp))
1390 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1391 return (error);
1392 }
1393
1394 /*
1395 * nfs write call
1396 */
1397 int
ncl_writerpc(struct vnode * vp,struct uio * uiop,struct ucred * cred,int * iomode,int * must_commit,int called_from_strategy)1398 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
1399 int *iomode, int *must_commit, int called_from_strategy)
1400 {
1401 struct nfsvattr nfsva;
1402 int error, attrflag, ret;
1403 struct nfsmount *nmp;
1404
1405 nmp = VFSTONFS(vnode_mount(vp));
1406 error = EIO;
1407 attrflag = 0;
1408 if (NFSHASPNFS(nmp))
1409 error = nfscl_doiods(vp, uiop, iomode, must_commit,
1410 NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td);
1411 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error);
1412 if (error != 0)
1413 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
1414 uiop->uio_td, &nfsva, &attrflag, NULL,
1415 called_from_strategy);
1416 if (attrflag) {
1417 if (VTONFS(vp)->n_flag & ND_NFSV4)
1418 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1,
1419 1);
1420 else
1421 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
1422 1);
1423 if (ret && !error)
1424 error = ret;
1425 }
1426 if (DOINGASYNC(vp))
1427 *iomode = NFSWRITE_FILESYNC;
1428 if (error && NFS_ISV4(vp))
1429 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1430 return (error);
1431 }
1432
1433 /*
1434 * nfs mknod rpc
1435 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
1436 * mode set to specify the file type and the size field for rdev.
1437 */
1438 static int
nfs_mknodrpc(struct vnode * dvp,struct vnode ** vpp,struct componentname * cnp,struct vattr * vap)1439 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
1440 struct vattr *vap)
1441 {
1442 struct nfsvattr nfsva, dnfsva;
1443 struct vnode *newvp = NULL;
1444 struct nfsnode *np = NULL, *dnp;
1445 struct nfsfh *nfhp;
1446 struct vattr vattr;
1447 int error = 0, attrflag, dattrflag;
1448 u_int32_t rdev;
1449
1450 if (vap->va_type == VCHR || vap->va_type == VBLK)
1451 rdev = vap->va_rdev;
1452 else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
1453 rdev = 0xffffffff;
1454 else
1455 return (EOPNOTSUPP);
1456 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1457 return (error);
1458 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
1459 rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva,
1460 &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
1461 if (!error) {
1462 if (!nfhp)
1463 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1464 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
1465 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1466 NULL);
1467 if (nfhp)
1468 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1469 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
1470 }
1471 if (dattrflag)
1472 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1473 if (!error) {
1474 newvp = NFSTOV(np);
1475 if (attrflag != 0) {
1476 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1477 0, 1);
1478 if (error != 0)
1479 vput(newvp);
1480 }
1481 }
1482 if (!error) {
1483 *vpp = newvp;
1484 } else if (NFS_ISV4(dvp)) {
1485 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
1486 vap->va_gid);
1487 }
1488 dnp = VTONFS(dvp);
1489 mtx_lock(&dnp->n_mtx);
1490 dnp->n_flag |= NMODIFIED;
1491 if (!dattrflag) {
1492 dnp->n_attrstamp = 0;
1493 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1494 }
1495 mtx_unlock(&dnp->n_mtx);
1496 return (error);
1497 }
1498
1499 /*
1500 * nfs mknod vop
1501 * just call nfs_mknodrpc() to do the work.
1502 */
1503 /* ARGSUSED */
1504 static int
nfs_mknod(struct vop_mknod_args * ap)1505 nfs_mknod(struct vop_mknod_args *ap)
1506 {
1507 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
1508 }
1509
1510 static struct mtx nfs_cverf_mtx;
1511 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex",
1512 MTX_DEF);
1513
1514 static nfsquad_t
nfs_get_cverf(void)1515 nfs_get_cverf(void)
1516 {
1517 static nfsquad_t cverf;
1518 nfsquad_t ret;
1519 static int cverf_initialized = 0;
1520
1521 mtx_lock(&nfs_cverf_mtx);
1522 if (cverf_initialized == 0) {
1523 cverf.lval[0] = arc4random();
1524 cverf.lval[1] = arc4random();
1525 cverf_initialized = 1;
1526 } else
1527 cverf.qval++;
1528 ret = cverf;
1529 mtx_unlock(&nfs_cverf_mtx);
1530
1531 return (ret);
1532 }
1533
1534 /*
1535 * nfs file create call
1536 */
1537 static int
nfs_create(struct vop_create_args * ap)1538 nfs_create(struct vop_create_args *ap)
1539 {
1540 struct vnode *dvp = ap->a_dvp;
1541 struct vattr *vap = ap->a_vap;
1542 struct componentname *cnp = ap->a_cnp;
1543 struct nfsnode *np = NULL, *dnp;
1544 struct vnode *newvp = NULL;
1545 struct nfsmount *nmp;
1546 struct nfsvattr dnfsva, nfsva;
1547 struct nfsfh *nfhp;
1548 nfsquad_t cverf;
1549 int error = 0, attrflag, dattrflag, fmode = 0;
1550 struct vattr vattr;
1551
1552 /*
1553 * Oops, not for me..
1554 */
1555 if (vap->va_type == VSOCK)
1556 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
1557
1558 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1559 return (error);
1560 if (vap->va_vaflags & VA_EXCLUSIVE)
1561 fmode |= O_EXCL;
1562 dnp = VTONFS(dvp);
1563 nmp = VFSTONFS(vnode_mount(dvp));
1564 again:
1565 /* For NFSv4, wait until any remove is done. */
1566 mtx_lock(&dnp->n_mtx);
1567 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
1568 dnp->n_flag |= NREMOVEWANT;
1569 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
1570 }
1571 mtx_unlock(&dnp->n_mtx);
1572
1573 cverf = nfs_get_cverf();
1574 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1575 vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva,
1576 &nfhp, &attrflag, &dattrflag, NULL);
1577 if (!error) {
1578 if (nfhp == NULL)
1579 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1580 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
1581 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1582 NULL);
1583 if (nfhp != NULL)
1584 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1585 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
1586 }
1587 if (dattrflag)
1588 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1589 if (!error) {
1590 newvp = NFSTOV(np);
1591 if (attrflag == 0)
1592 error = nfsrpc_getattr(newvp, cnp->cn_cred,
1593 cnp->cn_thread, &nfsva, NULL);
1594 if (error == 0)
1595 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1596 0, 1);
1597 }
1598 if (error) {
1599 if (newvp != NULL) {
1600 vput(newvp);
1601 newvp = NULL;
1602 }
1603 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
1604 error == NFSERR_NOTSUPP) {
1605 fmode &= ~O_EXCL;
1606 goto again;
1607 }
1608 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
1609 if (nfscl_checksattr(vap, &nfsva)) {
1610 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
1611 cnp->cn_thread, &nfsva, &attrflag, NULL);
1612 if (error && (vap->va_uid != (uid_t)VNOVAL ||
1613 vap->va_gid != (gid_t)VNOVAL)) {
1614 /* try again without setting uid/gid */
1615 vap->va_uid = (uid_t)VNOVAL;
1616 vap->va_gid = (uid_t)VNOVAL;
1617 error = nfsrpc_setattr(newvp, vap, NULL,
1618 cnp->cn_cred, cnp->cn_thread, &nfsva,
1619 &attrflag, NULL);
1620 }
1621 if (attrflag)
1622 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
1623 NULL, 0, 1);
1624 if (error != 0)
1625 vput(newvp);
1626 }
1627 }
1628 if (!error) {
1629 if ((cnp->cn_flags & MAKEENTRY) && attrflag)
1630 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
1631 NULL);
1632 *ap->a_vpp = newvp;
1633 } else if (NFS_ISV4(dvp)) {
1634 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
1635 vap->va_gid);
1636 }
1637 mtx_lock(&dnp->n_mtx);
1638 dnp->n_flag |= NMODIFIED;
1639 if (!dattrflag) {
1640 dnp->n_attrstamp = 0;
1641 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1642 }
1643 mtx_unlock(&dnp->n_mtx);
1644 return (error);
1645 }
1646
1647 /*
1648 * nfs file remove call
1649 * To try and make nfs semantics closer to ufs semantics, a file that has
1650 * other processes using the vnode is renamed instead of removed and then
1651 * removed later on the last close.
1652 * - If v_usecount > 1
1653 * If a rename is not already in the works
1654 * call nfs_sillyrename() to set it up
1655 * else
1656 * do the remove rpc
1657 */
1658 static int
nfs_remove(struct vop_remove_args * ap)1659 nfs_remove(struct vop_remove_args *ap)
1660 {
1661 struct vnode *vp = ap->a_vp;
1662 struct vnode *dvp = ap->a_dvp;
1663 struct componentname *cnp = ap->a_cnp;
1664 struct nfsnode *np = VTONFS(vp);
1665 int error = 0;
1666 struct vattr vattr;
1667
1668 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
1669 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
1670 if (vp->v_type == VDIR)
1671 error = EPERM;
1672 else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
1673 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
1674 vattr.va_nlink > 1)) {
1675 /*
1676 * Purge the name cache so that the chance of a lookup for
1677 * the name succeeding while the remove is in progress is
1678 * minimized. Without node locking it can still happen, such
1679 * that an I/O op returns ESTALE, but since you get this if
1680 * another host removes the file..
1681 */
1682 cache_purge(vp);
1683 /*
1684 * throw away biocache buffers, mainly to avoid
1685 * unnecessary delayed writes later.
1686 */
1687 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1);
1688 /* Do the rpc */
1689 if (error != EINTR && error != EIO)
1690 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
1691 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
1692 /*
1693 * Kludge City: If the first reply to the remove rpc is lost..
1694 * the reply to the retransmitted request will be ENOENT
1695 * since the file was in fact removed
1696 * Therefore, we cheat and return success.
1697 */
1698 if (error == ENOENT)
1699 error = 0;
1700 } else if (!np->n_sillyrename)
1701 error = nfs_sillyrename(dvp, vp, cnp);
1702 mtx_lock(&np->n_mtx);
1703 np->n_attrstamp = 0;
1704 mtx_unlock(&np->n_mtx);
1705 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1706 return (error);
1707 }
1708
1709 /*
1710 * nfs file remove rpc called from nfs_inactive
1711 */
1712 int
ncl_removeit(struct sillyrename * sp,struct vnode * vp)1713 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
1714 {
1715 /*
1716 * Make sure that the directory vnode is still valid.
1717 * XXX we should lock sp->s_dvp here.
1718 */
1719 if (sp->s_dvp->v_type == VBAD)
1720 return (0);
1721 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
1722 sp->s_cred, NULL));
1723 }
1724
1725 /*
1726 * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
1727 */
1728 static int
nfs_removerpc(struct vnode * dvp,struct vnode * vp,char * name,int namelen,struct ucred * cred,struct thread * td)1729 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
1730 int namelen, struct ucred *cred, struct thread *td)
1731 {
1732 struct nfsvattr dnfsva;
1733 struct nfsnode *dnp = VTONFS(dvp);
1734 int error = 0, dattrflag;
1735
1736 mtx_lock(&dnp->n_mtx);
1737 dnp->n_flag |= NREMOVEINPROG;
1738 mtx_unlock(&dnp->n_mtx);
1739 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
1740 &dattrflag, NULL);
1741 mtx_lock(&dnp->n_mtx);
1742 if ((dnp->n_flag & NREMOVEWANT)) {
1743 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
1744 mtx_unlock(&dnp->n_mtx);
1745 wakeup((caddr_t)dnp);
1746 } else {
1747 dnp->n_flag &= ~NREMOVEINPROG;
1748 mtx_unlock(&dnp->n_mtx);
1749 }
1750 if (dattrflag)
1751 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1752 mtx_lock(&dnp->n_mtx);
1753 dnp->n_flag |= NMODIFIED;
1754 if (!dattrflag) {
1755 dnp->n_attrstamp = 0;
1756 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1757 }
1758 mtx_unlock(&dnp->n_mtx);
1759 if (error && NFS_ISV4(dvp))
1760 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1761 return (error);
1762 }
1763
1764 /*
1765 * nfs file rename call
1766 */
1767 static int
nfs_rename(struct vop_rename_args * ap)1768 nfs_rename(struct vop_rename_args *ap)
1769 {
1770 struct vnode *fvp = ap->a_fvp;
1771 struct vnode *tvp = ap->a_tvp;
1772 struct vnode *fdvp = ap->a_fdvp;
1773 struct vnode *tdvp = ap->a_tdvp;
1774 struct componentname *tcnp = ap->a_tcnp;
1775 struct componentname *fcnp = ap->a_fcnp;
1776 struct nfsnode *fnp = VTONFS(ap->a_fvp);
1777 struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
1778 struct nfsv4node *newv4 = NULL;
1779 int error;
1780
1781 KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
1782 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
1783 /* Check for cross-device rename */
1784 if ((fvp->v_mount != tdvp->v_mount) ||
1785 (tvp && (fvp->v_mount != tvp->v_mount))) {
1786 error = EXDEV;
1787 goto out;
1788 }
1789
1790 if (fvp == tvp) {
1791 printf("nfs_rename: fvp == tvp (can't happen)\n");
1792 error = 0;
1793 goto out;
1794 }
1795 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
1796 goto out;
1797
1798 /*
1799 * We have to flush B_DELWRI data prior to renaming
1800 * the file. If we don't, the delayed-write buffers
1801 * can be flushed out later after the file has gone stale
1802 * under NFSV3. NFSV2 does not have this problem because
1803 * ( as far as I can tell ) it flushes dirty buffers more
1804 * often.
1805 *
1806 * Skip the rename operation if the fsync fails, this can happen
1807 * due to the server's volume being full, when we pushed out data
1808 * that was written back to our cache earlier. Not checking for
1809 * this condition can result in potential (silent) data loss.
1810 */
1811 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
1812 NFSVOPUNLOCK(fvp, 0);
1813 if (!error && tvp)
1814 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
1815 if (error)
1816 goto out;
1817
1818 /*
1819 * If the tvp exists and is in use, sillyrename it before doing the
1820 * rename of the new file over it.
1821 * XXX Can't sillyrename a directory.
1822 */
1823 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
1824 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
1825 vput(tvp);
1826 tvp = NULL;
1827 }
1828
1829 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
1830 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
1831 tcnp->cn_thread);
1832
1833 if (error == 0 && NFS_ISV4(tdvp)) {
1834 /*
1835 * For NFSv4, check to see if it is the same name and
1836 * replace the name, if it is different.
1837 */
1838 MALLOC(newv4, struct nfsv4node *,
1839 sizeof (struct nfsv4node) +
1840 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
1841 M_NFSV4NODE, M_WAITOK);
1842 mtx_lock(&tdnp->n_mtx);
1843 mtx_lock(&fnp->n_mtx);
1844 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
1845 (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
1846 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
1847 tcnp->cn_namelen) ||
1848 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
1849 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
1850 tdnp->n_fhp->nfh_len))) {
1851 #ifdef notdef
1852 { char nnn[100]; int nnnl;
1853 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
1854 bcopy(tcnp->cn_nameptr, nnn, nnnl);
1855 nnn[nnnl] = '\0';
1856 printf("ren replace=%s\n",nnn);
1857 }
1858 #endif
1859 FREE((caddr_t)fnp->n_v4, M_NFSV4NODE);
1860 fnp->n_v4 = newv4;
1861 newv4 = NULL;
1862 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
1863 fnp->n_v4->n4_namelen = tcnp->cn_namelen;
1864 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
1865 tdnp->n_fhp->nfh_len);
1866 NFSBCOPY(tcnp->cn_nameptr,
1867 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
1868 }
1869 mtx_unlock(&tdnp->n_mtx);
1870 mtx_unlock(&fnp->n_mtx);
1871 if (newv4 != NULL)
1872 FREE((caddr_t)newv4, M_NFSV4NODE);
1873 }
1874
1875 if (fvp->v_type == VDIR) {
1876 if (tvp != NULL && tvp->v_type == VDIR)
1877 cache_purge(tdvp);
1878 cache_purge(fdvp);
1879 }
1880
1881 out:
1882 if (tdvp == tvp)
1883 vrele(tdvp);
1884 else
1885 vput(tdvp);
1886 if (tvp)
1887 vput(tvp);
1888 vrele(fdvp);
1889 vrele(fvp);
1890 /*
1891 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
1892 */
1893 if (error == ENOENT)
1894 error = 0;
1895 return (error);
1896 }
1897
1898 /*
1899 * nfs file rename rpc called from nfs_remove() above
1900 */
1901 static int
nfs_renameit(struct vnode * sdvp,struct vnode * svp,struct componentname * scnp,struct sillyrename * sp)1902 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
1903 struct sillyrename *sp)
1904 {
1905
1906 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
1907 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
1908 scnp->cn_thread));
1909 }
1910
1911 /*
1912 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
1913 */
1914 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)1915 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
1916 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
1917 int tnamelen, struct ucred *cred, struct thread *td)
1918 {
1919 struct nfsvattr fnfsva, tnfsva;
1920 struct nfsnode *fdnp = VTONFS(fdvp);
1921 struct nfsnode *tdnp = VTONFS(tdvp);
1922 int error = 0, fattrflag, tattrflag;
1923
1924 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
1925 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
1926 &tattrflag, NULL, NULL);
1927 mtx_lock(&fdnp->n_mtx);
1928 fdnp->n_flag |= NMODIFIED;
1929 if (fattrflag != 0) {
1930 mtx_unlock(&fdnp->n_mtx);
1931 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1);
1932 } else {
1933 fdnp->n_attrstamp = 0;
1934 mtx_unlock(&fdnp->n_mtx);
1935 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
1936 }
1937 mtx_lock(&tdnp->n_mtx);
1938 tdnp->n_flag |= NMODIFIED;
1939 if (tattrflag != 0) {
1940 mtx_unlock(&tdnp->n_mtx);
1941 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1);
1942 } else {
1943 tdnp->n_attrstamp = 0;
1944 mtx_unlock(&tdnp->n_mtx);
1945 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
1946 }
1947 if (error && NFS_ISV4(fdvp))
1948 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1949 return (error);
1950 }
1951
1952 /*
1953 * nfs hard link create call
1954 */
1955 static int
nfs_link(struct vop_link_args * ap)1956 nfs_link(struct vop_link_args *ap)
1957 {
1958 struct vnode *vp = ap->a_vp;
1959 struct vnode *tdvp = ap->a_tdvp;
1960 struct componentname *cnp = ap->a_cnp;
1961 struct nfsnode *np, *tdnp;
1962 struct nfsvattr nfsva, dnfsva;
1963 int error = 0, attrflag, dattrflag;
1964
1965 /*
1966 * Push all writes to the server, so that the attribute cache
1967 * doesn't get "out of sync" with the server.
1968 * XXX There should be a better way!
1969 */
1970 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
1971
1972 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
1973 cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag,
1974 &dattrflag, NULL);
1975 tdnp = VTONFS(tdvp);
1976 mtx_lock(&tdnp->n_mtx);
1977 tdnp->n_flag |= NMODIFIED;
1978 if (dattrflag != 0) {
1979 mtx_unlock(&tdnp->n_mtx);
1980 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1);
1981 } else {
1982 tdnp->n_attrstamp = 0;
1983 mtx_unlock(&tdnp->n_mtx);
1984 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
1985 }
1986 if (attrflag)
1987 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1988 else {
1989 np = VTONFS(vp);
1990 mtx_lock(&np->n_mtx);
1991 np->n_attrstamp = 0;
1992 mtx_unlock(&np->n_mtx);
1993 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1994 }
1995 /*
1996 * If negative lookup caching is enabled, I might as well
1997 * add an entry for this node. Not necessary for correctness,
1998 * but if negative caching is enabled, then the system
1999 * must care about lookup caching hit rate, so...
2000 */
2001 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
2002 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2003 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL);
2004 }
2005 if (error && NFS_ISV4(vp))
2006 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
2007 (gid_t)0);
2008 return (error);
2009 }
2010
2011 /*
2012 * nfs symbolic link create call
2013 */
2014 static int
nfs_symlink(struct vop_symlink_args * ap)2015 nfs_symlink(struct vop_symlink_args *ap)
2016 {
2017 struct vnode *dvp = ap->a_dvp;
2018 struct vattr *vap = ap->a_vap;
2019 struct componentname *cnp = ap->a_cnp;
2020 struct nfsvattr nfsva, dnfsva;
2021 struct nfsfh *nfhp;
2022 struct nfsnode *np = NULL, *dnp;
2023 struct vnode *newvp = NULL;
2024 int error = 0, attrflag, dattrflag, ret;
2025
2026 vap->va_type = VLNK;
2027 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2028 ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva,
2029 &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
2030 if (nfhp) {
2031 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
2032 &np, NULL, LK_EXCLUSIVE);
2033 if (!ret)
2034 newvp = NFSTOV(np);
2035 else if (!error)
2036 error = ret;
2037 }
2038 if (newvp != NULL) {
2039 if (attrflag)
2040 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
2041 0, 1);
2042 } else if (!error) {
2043 /*
2044 * If we do not have an error and we could not extract the
2045 * newvp from the response due to the request being NFSv2, we
2046 * have to do a lookup in order to obtain a newvp to return.
2047 */
2048 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2049 cnp->cn_cred, cnp->cn_thread, &np);
2050 if (!error)
2051 newvp = NFSTOV(np);
2052 }
2053 if (error) {
2054 if (newvp)
2055 vput(newvp);
2056 if (NFS_ISV4(dvp))
2057 error = nfscl_maperr(cnp->cn_thread, error,
2058 vap->va_uid, vap->va_gid);
2059 } else {
2060 *ap->a_vpp = newvp;
2061 }
2062
2063 dnp = VTONFS(dvp);
2064 mtx_lock(&dnp->n_mtx);
2065 dnp->n_flag |= NMODIFIED;
2066 if (dattrflag != 0) {
2067 mtx_unlock(&dnp->n_mtx);
2068 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2069 } else {
2070 dnp->n_attrstamp = 0;
2071 mtx_unlock(&dnp->n_mtx);
2072 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2073 }
2074 /*
2075 * If negative lookup caching is enabled, I might as well
2076 * add an entry for this node. Not necessary for correctness,
2077 * but if negative caching is enabled, then the system
2078 * must care about lookup caching hit rate, so...
2079 */
2080 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2081 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2082 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, NULL);
2083 }
2084 return (error);
2085 }
2086
2087 /*
2088 * nfs make dir call
2089 */
2090 static int
nfs_mkdir(struct vop_mkdir_args * ap)2091 nfs_mkdir(struct vop_mkdir_args *ap)
2092 {
2093 struct vnode *dvp = ap->a_dvp;
2094 struct vattr *vap = ap->a_vap;
2095 struct componentname *cnp = ap->a_cnp;
2096 struct nfsnode *np = NULL, *dnp;
2097 struct vnode *newvp = NULL;
2098 struct vattr vattr;
2099 struct nfsfh *nfhp;
2100 struct nfsvattr nfsva, dnfsva;
2101 int error = 0, attrflag, dattrflag, ret;
2102
2103 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
2104 return (error);
2105 vap->va_type = VDIR;
2106 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2107 vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp,
2108 &attrflag, &dattrflag, NULL);
2109 dnp = VTONFS(dvp);
2110 mtx_lock(&dnp->n_mtx);
2111 dnp->n_flag |= NMODIFIED;
2112 if (dattrflag != 0) {
2113 mtx_unlock(&dnp->n_mtx);
2114 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2115 } else {
2116 dnp->n_attrstamp = 0;
2117 mtx_unlock(&dnp->n_mtx);
2118 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2119 }
2120 if (nfhp) {
2121 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
2122 &np, NULL, LK_EXCLUSIVE);
2123 if (!ret) {
2124 newvp = NFSTOV(np);
2125 if (attrflag)
2126 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
2127 NULL, 0, 1);
2128 } else if (!error)
2129 error = ret;
2130 }
2131 if (!error && newvp == NULL) {
2132 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2133 cnp->cn_cred, cnp->cn_thread, &np);
2134 if (!error) {
2135 newvp = NFSTOV(np);
2136 if (newvp->v_type != VDIR)
2137 error = EEXIST;
2138 }
2139 }
2140 if (error) {
2141 if (newvp)
2142 vput(newvp);
2143 if (NFS_ISV4(dvp))
2144 error = nfscl_maperr(cnp->cn_thread, error,
2145 vap->va_uid, vap->va_gid);
2146 } else {
2147 /*
2148 * If negative lookup caching is enabled, I might as well
2149 * add an entry for this node. Not necessary for correctness,
2150 * but if negative caching is enabled, then the system
2151 * must care about lookup caching hit rate, so...
2152 */
2153 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2154 (cnp->cn_flags & MAKEENTRY) &&
2155 attrflag != 0 && dattrflag != 0)
2156 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
2157 &dnfsva.na_ctime);
2158 *ap->a_vpp = newvp;
2159 }
2160 return (error);
2161 }
2162
2163 /*
2164 * nfs remove directory call
2165 */
2166 static int
nfs_rmdir(struct vop_rmdir_args * ap)2167 nfs_rmdir(struct vop_rmdir_args *ap)
2168 {
2169 struct vnode *vp = ap->a_vp;
2170 struct vnode *dvp = ap->a_dvp;
2171 struct componentname *cnp = ap->a_cnp;
2172 struct nfsnode *dnp;
2173 struct nfsvattr dnfsva;
2174 int error, dattrflag;
2175
2176 if (dvp == vp)
2177 return (EINVAL);
2178 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2179 cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL);
2180 dnp = VTONFS(dvp);
2181 mtx_lock(&dnp->n_mtx);
2182 dnp->n_flag |= NMODIFIED;
2183 if (dattrflag != 0) {
2184 mtx_unlock(&dnp->n_mtx);
2185 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2186 } else {
2187 dnp->n_attrstamp = 0;
2188 mtx_unlock(&dnp->n_mtx);
2189 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2190 }
2191
2192 cache_purge(dvp);
2193 cache_purge(vp);
2194 if (error && NFS_ISV4(dvp))
2195 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
2196 (gid_t)0);
2197 /*
2198 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
2199 */
2200 if (error == ENOENT)
2201 error = 0;
2202 return (error);
2203 }
2204
2205 /*
2206 * nfs readdir call
2207 */
2208 static int
nfs_readdir(struct vop_readdir_args * ap)2209 nfs_readdir(struct vop_readdir_args *ap)
2210 {
2211 struct vnode *vp = ap->a_vp;
2212 struct nfsnode *np = VTONFS(vp);
2213 struct uio *uio = ap->a_uio;
2214 ssize_t tresid, left;
2215 int error = 0;
2216 struct vattr vattr;
2217
2218 if (ap->a_eofflag != NULL)
2219 *ap->a_eofflag = 0;
2220 if (vp->v_type != VDIR)
2221 return(EPERM);
2222
2223 /*
2224 * First, check for hit on the EOF offset cache
2225 */
2226 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
2227 (np->n_flag & NMODIFIED) == 0) {
2228 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
2229 mtx_lock(&np->n_mtx);
2230 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
2231 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
2232 mtx_unlock(&np->n_mtx);
2233 NFSINCRGLOBAL(newnfsstats.direofcache_hits);
2234 if (ap->a_eofflag != NULL)
2235 *ap->a_eofflag = 1;
2236 return (0);
2237 } else
2238 mtx_unlock(&np->n_mtx);
2239 }
2240 }
2241
2242 /*
2243 * NFS always guarantees that directory entries don't straddle
2244 * DIRBLKSIZ boundaries. As such, we need to limit the size
2245 * to an exact multiple of DIRBLKSIZ, to avoid copying a partial
2246 * directory entry.
2247 */
2248 left = uio->uio_resid % DIRBLKSIZ;
2249 if (left == uio->uio_resid)
2250 return (EINVAL);
2251 uio->uio_resid -= left;
2252
2253 /*
2254 * Call ncl_bioread() to do the real work.
2255 */
2256 tresid = uio->uio_resid;
2257 error = ncl_bioread(vp, uio, 0, ap->a_cred);
2258
2259 if (!error && uio->uio_resid == tresid) {
2260 NFSINCRGLOBAL(newnfsstats.direofcache_misses);
2261 if (ap->a_eofflag != NULL)
2262 *ap->a_eofflag = 1;
2263 }
2264
2265 /* Add the partial DIRBLKSIZ (left) back in. */
2266 uio->uio_resid += left;
2267 return (error);
2268 }
2269
2270 /*
2271 * Readdir rpc call.
2272 * Called from below the buffer cache by ncl_doio().
2273 */
2274 int
ncl_readdirrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred,struct thread * td)2275 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2276 struct thread *td)
2277 {
2278 struct nfsvattr nfsva;
2279 nfsuint64 *cookiep, cookie;
2280 struct nfsnode *dnp = VTONFS(vp);
2281 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2282 int error = 0, eof, attrflag;
2283
2284 KASSERT(uiop->uio_iovcnt == 1 &&
2285 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2286 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2287 ("nfs readdirrpc bad uio"));
2288
2289 /*
2290 * If there is no cookie, assume directory was stale.
2291 */
2292 ncl_dircookie_lock(dnp);
2293 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2294 if (cookiep) {
2295 cookie = *cookiep;
2296 ncl_dircookie_unlock(dnp);
2297 } else {
2298 ncl_dircookie_unlock(dnp);
2299 return (NFSERR_BAD_COOKIE);
2300 }
2301
2302 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2303 (void)ncl_fsinfo(nmp, vp, cred, td);
2304
2305 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
2306 &attrflag, &eof, NULL);
2307 if (attrflag)
2308 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2309
2310 if (!error) {
2311 /*
2312 * We are now either at the end of the directory or have filled
2313 * the block.
2314 */
2315 if (eof)
2316 dnp->n_direofoffset = uiop->uio_offset;
2317 else {
2318 if (uiop->uio_resid > 0)
2319 printf("EEK! readdirrpc resid > 0\n");
2320 ncl_dircookie_lock(dnp);
2321 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2322 *cookiep = cookie;
2323 ncl_dircookie_unlock(dnp);
2324 }
2325 } else if (NFS_ISV4(vp)) {
2326 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2327 }
2328 return (error);
2329 }
2330
2331 /*
2332 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
2333 */
2334 int
ncl_readdirplusrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred,struct thread * td)2335 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2336 struct thread *td)
2337 {
2338 struct nfsvattr nfsva;
2339 nfsuint64 *cookiep, cookie;
2340 struct nfsnode *dnp = VTONFS(vp);
2341 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2342 int error = 0, attrflag, eof;
2343
2344 KASSERT(uiop->uio_iovcnt == 1 &&
2345 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2346 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2347 ("nfs readdirplusrpc bad uio"));
2348
2349 /*
2350 * If there is no cookie, assume directory was stale.
2351 */
2352 ncl_dircookie_lock(dnp);
2353 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2354 if (cookiep) {
2355 cookie = *cookiep;
2356 ncl_dircookie_unlock(dnp);
2357 } else {
2358 ncl_dircookie_unlock(dnp);
2359 return (NFSERR_BAD_COOKIE);
2360 }
2361
2362 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2363 (void)ncl_fsinfo(nmp, vp, cred, td);
2364 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
2365 &attrflag, &eof, NULL);
2366 if (attrflag)
2367 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2368
2369 if (!error) {
2370 /*
2371 * We are now either at end of the directory or have filled the
2372 * the block.
2373 */
2374 if (eof)
2375 dnp->n_direofoffset = uiop->uio_offset;
2376 else {
2377 if (uiop->uio_resid > 0)
2378 printf("EEK! readdirplusrpc resid > 0\n");
2379 ncl_dircookie_lock(dnp);
2380 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2381 *cookiep = cookie;
2382 ncl_dircookie_unlock(dnp);
2383 }
2384 } else if (NFS_ISV4(vp)) {
2385 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2386 }
2387 return (error);
2388 }
2389
2390 /*
2391 * Silly rename. To make the NFS filesystem that is stateless look a little
2392 * more like the "ufs" a remove of an active vnode is translated to a rename
2393 * to a funny looking filename that is removed by nfs_inactive on the
2394 * nfsnode. There is the potential for another process on a different client
2395 * to create the same funny name between the nfs_lookitup() fails and the
2396 * nfs_rename() completes, but...
2397 */
2398 static int
nfs_sillyrename(struct vnode * dvp,struct vnode * vp,struct componentname * cnp)2399 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
2400 {
2401 struct sillyrename *sp;
2402 struct nfsnode *np;
2403 int error;
2404 short pid;
2405 unsigned int lticks;
2406
2407 cache_purge(dvp);
2408 np = VTONFS(vp);
2409 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
2410 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
2411 M_NEWNFSREQ, M_WAITOK);
2412 sp->s_cred = crhold(cnp->cn_cred);
2413 sp->s_dvp = dvp;
2414 VREF(dvp);
2415
2416 /*
2417 * Fudge together a funny name.
2418 * Changing the format of the funny name to accomodate more
2419 * sillynames per directory.
2420 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is
2421 * CPU ticks since boot.
2422 */
2423 pid = cnp->cn_thread->td_proc->p_pid;
2424 lticks = (unsigned int)ticks;
2425 for ( ; ; ) {
2426 sp->s_namlen = sprintf(sp->s_name,
2427 ".nfs.%08x.%04x4.4", lticks,
2428 pid);
2429 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2430 cnp->cn_thread, NULL))
2431 break;
2432 lticks++;
2433 }
2434 error = nfs_renameit(dvp, vp, cnp, sp);
2435 if (error)
2436 goto bad;
2437 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2438 cnp->cn_thread, &np);
2439 np->n_sillyrename = sp;
2440 return (0);
2441 bad:
2442 vrele(sp->s_dvp);
2443 crfree(sp->s_cred);
2444 free((caddr_t)sp, M_NEWNFSREQ);
2445 return (error);
2446 }
2447
2448 /*
2449 * Look up a file name and optionally either update the file handle or
2450 * allocate an nfsnode, depending on the value of npp.
2451 * npp == NULL --> just do the lookup
2452 * *npp == NULL --> allocate a new nfsnode and make sure attributes are
2453 * handled too
2454 * *npp != NULL --> update the file handle in the vnode
2455 */
2456 static int
nfs_lookitup(struct vnode * dvp,char * name,int len,struct ucred * cred,struct thread * td,struct nfsnode ** npp)2457 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
2458 struct thread *td, struct nfsnode **npp)
2459 {
2460 struct vnode *newvp = NULL, *vp;
2461 struct nfsnode *np, *dnp = VTONFS(dvp);
2462 struct nfsfh *nfhp, *onfhp;
2463 struct nfsvattr nfsva, dnfsva;
2464 struct componentname cn;
2465 int error = 0, attrflag, dattrflag;
2466 u_int hash;
2467
2468 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
2469 &nfhp, &attrflag, &dattrflag, NULL);
2470 if (dattrflag)
2471 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2472 if (npp && !error) {
2473 if (*npp != NULL) {
2474 np = *npp;
2475 vp = NFSTOV(np);
2476 /*
2477 * For NFSv4, check to see if it is the same name and
2478 * replace the name, if it is different.
2479 */
2480 if (np->n_v4 != NULL && nfsva.na_type == VREG &&
2481 (np->n_v4->n4_namelen != len ||
2482 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
2483 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
2484 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2485 dnp->n_fhp->nfh_len))) {
2486 #ifdef notdef
2487 { char nnn[100]; int nnnl;
2488 nnnl = (len < 100) ? len : 99;
2489 bcopy(name, nnn, nnnl);
2490 nnn[nnnl] = '\0';
2491 printf("replace=%s\n",nnn);
2492 }
2493 #endif
2494 FREE((caddr_t)np->n_v4, M_NFSV4NODE);
2495 MALLOC(np->n_v4, struct nfsv4node *,
2496 sizeof (struct nfsv4node) +
2497 dnp->n_fhp->nfh_len + len - 1,
2498 M_NFSV4NODE, M_WAITOK);
2499 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
2500 np->n_v4->n4_namelen = len;
2501 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2502 dnp->n_fhp->nfh_len);
2503 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
2504 }
2505 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
2506 FNV1_32_INIT);
2507 onfhp = np->n_fhp;
2508 /*
2509 * Rehash node for new file handle.
2510 */
2511 vfs_hash_rehash(vp, hash);
2512 np->n_fhp = nfhp;
2513 if (onfhp != NULL)
2514 FREE((caddr_t)onfhp, M_NFSFH);
2515 newvp = NFSTOV(np);
2516 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
2517 FREE((caddr_t)nfhp, M_NFSFH);
2518 VREF(dvp);
2519 newvp = dvp;
2520 } else {
2521 cn.cn_nameptr = name;
2522 cn.cn_namelen = len;
2523 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
2524 &np, NULL, LK_EXCLUSIVE);
2525 if (error)
2526 return (error);
2527 newvp = NFSTOV(np);
2528 }
2529 if (!attrflag && *npp == NULL) {
2530 if (newvp == dvp)
2531 vrele(newvp);
2532 else
2533 vput(newvp);
2534 return (ENOENT);
2535 }
2536 if (attrflag)
2537 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
2538 0, 1);
2539 }
2540 if (npp && *npp == NULL) {
2541 if (error) {
2542 if (newvp) {
2543 if (newvp == dvp)
2544 vrele(newvp);
2545 else
2546 vput(newvp);
2547 }
2548 } else
2549 *npp = np;
2550 }
2551 if (error && NFS_ISV4(dvp))
2552 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2553 return (error);
2554 }
2555
2556 /*
2557 * Nfs Version 3 and 4 commit rpc
2558 */
2559 int
ncl_commit(struct vnode * vp,u_quad_t offset,int cnt,struct ucred * cred,struct thread * td)2560 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
2561 struct thread *td)
2562 {
2563 struct nfsvattr nfsva;
2564 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2565 struct nfsnode *np;
2566 struct uio uio;
2567 int error, attrflag;
2568
2569 np = VTONFS(vp);
2570 error = EIO;
2571 attrflag = 0;
2572 if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) {
2573 uio.uio_offset = offset;
2574 uio.uio_resid = cnt;
2575 error = nfscl_doiods(vp, &uio, NULL, NULL,
2576 NFSV4OPEN_ACCESSWRITE, 1, cred, td);
2577 if (error != 0) {
2578 mtx_lock(&np->n_mtx);
2579 np->n_flag &= ~NDSCOMMIT;
2580 mtx_unlock(&np->n_mtx);
2581 }
2582 }
2583 if (error != 0) {
2584 mtx_lock(&nmp->nm_mtx);
2585 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
2586 mtx_unlock(&nmp->nm_mtx);
2587 return (0);
2588 }
2589 mtx_unlock(&nmp->nm_mtx);
2590 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva,
2591 &attrflag, NULL);
2592 }
2593 if (attrflag != 0)
2594 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL,
2595 0, 1);
2596 if (error != 0 && NFS_ISV4(vp))
2597 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2598 return (error);
2599 }
2600
2601 /*
2602 * Strategy routine.
2603 * For async requests when nfsiod(s) are running, queue the request by
2604 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
2605 * request.
2606 */
2607 static int
nfs_strategy(struct vop_strategy_args * ap)2608 nfs_strategy(struct vop_strategy_args *ap)
2609 {
2610 struct buf *bp = ap->a_bp;
2611 struct ucred *cr;
2612
2613 KASSERT(!(bp->b_flags & B_DONE),
2614 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
2615 BUF_ASSERT_HELD(bp);
2616
2617 if (bp->b_iocmd == BIO_READ)
2618 cr = bp->b_rcred;
2619 else
2620 cr = bp->b_wcred;
2621
2622 /*
2623 * If the op is asynchronous and an i/o daemon is waiting
2624 * queue the request, wake it up and wait for completion
2625 * otherwise just do it ourselves.
2626 */
2627 if ((bp->b_flags & B_ASYNC) == 0 ||
2628 ncl_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
2629 (void) ncl_doio(ap->a_vp, bp, cr, curthread, 1);
2630 return (0);
2631 }
2632
2633 /*
2634 * fsync vnode op. Just call ncl_flush() with commit == 1.
2635 */
2636 /* ARGSUSED */
2637 static int
nfs_fsync(struct vop_fsync_args * ap)2638 nfs_fsync(struct vop_fsync_args *ap)
2639 {
2640
2641 if (ap->a_vp->v_type != VREG) {
2642 /*
2643 * For NFS, metadata is changed synchronously on the server,
2644 * so there is nothing to flush. Also, ncl_flush() clears
2645 * the NMODIFIED flag and that shouldn't be done here for
2646 * directories.
2647 */
2648 return (0);
2649 }
2650 return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0));
2651 }
2652
2653 /*
2654 * Flush all the blocks associated with a vnode.
2655 * Walk through the buffer pool and push any dirty pages
2656 * associated with the vnode.
2657 * If the called_from_renewthread argument is TRUE, it has been called
2658 * from the NFSv4 renew thread and, as such, cannot block indefinitely
2659 * waiting for a buffer write to complete.
2660 */
2661 int
ncl_flush(struct vnode * vp,int waitfor,struct thread * td,int commit,int called_from_renewthread)2662 ncl_flush(struct vnode *vp, int waitfor, struct thread *td,
2663 int commit, int called_from_renewthread)
2664 {
2665 struct nfsnode *np = VTONFS(vp);
2666 struct buf *bp;
2667 int i;
2668 struct buf *nbp;
2669 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2670 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
2671 int passone = 1, trycnt = 0;
2672 u_quad_t off, endoff, toff;
2673 struct ucred* wcred = NULL;
2674 struct buf **bvec = NULL;
2675 struct bufobj *bo;
2676 #ifndef NFS_COMMITBVECSIZ
2677 #define NFS_COMMITBVECSIZ 20
2678 #endif
2679 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
2680 int bvecsize = 0, bveccount;
2681
2682 if (called_from_renewthread != 0)
2683 slptimeo = hz;
2684 if (nmp->nm_flag & NFSMNT_INT)
2685 slpflag = PCATCH;
2686 if (!commit)
2687 passone = 0;
2688 bo = &vp->v_bufobj;
2689 /*
2690 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
2691 * server, but has not been committed to stable storage on the server
2692 * yet. On the first pass, the byte range is worked out and the commit
2693 * rpc is done. On the second pass, ncl_writebp() is called to do the
2694 * job.
2695 */
2696 again:
2697 off = (u_quad_t)-1;
2698 endoff = 0;
2699 bvecpos = 0;
2700 if (NFS_ISV34(vp) && commit) {
2701 if (bvec != NULL && bvec != bvec_on_stack)
2702 free(bvec, M_TEMP);
2703 /*
2704 * Count up how many buffers waiting for a commit.
2705 */
2706 bveccount = 0;
2707 BO_LOCK(bo);
2708 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2709 if (!BUF_ISLOCKED(bp) &&
2710 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
2711 == (B_DELWRI | B_NEEDCOMMIT))
2712 bveccount++;
2713 }
2714 /*
2715 * Allocate space to remember the list of bufs to commit. It is
2716 * important to use M_NOWAIT here to avoid a race with nfs_write.
2717 * If we can't get memory (for whatever reason), we will end up
2718 * committing the buffers one-by-one in the loop below.
2719 */
2720 if (bveccount > NFS_COMMITBVECSIZ) {
2721 /*
2722 * Release the vnode interlock to avoid a lock
2723 * order reversal.
2724 */
2725 BO_UNLOCK(bo);
2726 bvec = (struct buf **)
2727 malloc(bveccount * sizeof(struct buf *),
2728 M_TEMP, M_NOWAIT);
2729 BO_LOCK(bo);
2730 if (bvec == NULL) {
2731 bvec = bvec_on_stack;
2732 bvecsize = NFS_COMMITBVECSIZ;
2733 } else
2734 bvecsize = bveccount;
2735 } else {
2736 bvec = bvec_on_stack;
2737 bvecsize = NFS_COMMITBVECSIZ;
2738 }
2739 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2740 if (bvecpos >= bvecsize)
2741 break;
2742 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2743 nbp = TAILQ_NEXT(bp, b_bobufs);
2744 continue;
2745 }
2746 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
2747 (B_DELWRI | B_NEEDCOMMIT)) {
2748 BUF_UNLOCK(bp);
2749 nbp = TAILQ_NEXT(bp, b_bobufs);
2750 continue;
2751 }
2752 BO_UNLOCK(bo);
2753 bremfree(bp);
2754 /*
2755 * Work out if all buffers are using the same cred
2756 * so we can deal with them all with one commit.
2757 *
2758 * NOTE: we are not clearing B_DONE here, so we have
2759 * to do it later on in this routine if we intend to
2760 * initiate I/O on the bp.
2761 *
2762 * Note: to avoid loopback deadlocks, we do not
2763 * assign b_runningbufspace.
2764 */
2765 if (wcred == NULL)
2766 wcred = bp->b_wcred;
2767 else if (wcred != bp->b_wcred)
2768 wcred = NOCRED;
2769 vfs_busy_pages(bp, 1);
2770
2771 BO_LOCK(bo);
2772 /*
2773 * bp is protected by being locked, but nbp is not
2774 * and vfs_busy_pages() may sleep. We have to
2775 * recalculate nbp.
2776 */
2777 nbp = TAILQ_NEXT(bp, b_bobufs);
2778
2779 /*
2780 * A list of these buffers is kept so that the
2781 * second loop knows which buffers have actually
2782 * been committed. This is necessary, since there
2783 * may be a race between the commit rpc and new
2784 * uncommitted writes on the file.
2785 */
2786 bvec[bvecpos++] = bp;
2787 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
2788 bp->b_dirtyoff;
2789 if (toff < off)
2790 off = toff;
2791 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
2792 if (toff > endoff)
2793 endoff = toff;
2794 }
2795 BO_UNLOCK(bo);
2796 }
2797 if (bvecpos > 0) {
2798 /*
2799 * Commit data on the server, as required.
2800 * If all bufs are using the same wcred, then use that with
2801 * one call for all of them, otherwise commit each one
2802 * separately.
2803 */
2804 if (wcred != NOCRED)
2805 retv = ncl_commit(vp, off, (int)(endoff - off),
2806 wcred, td);
2807 else {
2808 retv = 0;
2809 for (i = 0; i < bvecpos; i++) {
2810 off_t off, size;
2811 bp = bvec[i];
2812 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
2813 bp->b_dirtyoff;
2814 size = (u_quad_t)(bp->b_dirtyend
2815 - bp->b_dirtyoff);
2816 retv = ncl_commit(vp, off, (int)size,
2817 bp->b_wcred, td);
2818 if (retv) break;
2819 }
2820 }
2821
2822 if (retv == NFSERR_STALEWRITEVERF)
2823 ncl_clearcommit(vp->v_mount);
2824
2825 /*
2826 * Now, either mark the blocks I/O done or mark the
2827 * blocks dirty, depending on whether the commit
2828 * succeeded.
2829 */
2830 for (i = 0; i < bvecpos; i++) {
2831 bp = bvec[i];
2832 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
2833 if (retv) {
2834 /*
2835 * Error, leave B_DELWRI intact
2836 */
2837 vfs_unbusy_pages(bp);
2838 brelse(bp);
2839 } else {
2840 /*
2841 * Success, remove B_DELWRI ( bundirty() ).
2842 *
2843 * b_dirtyoff/b_dirtyend seem to be NFS
2844 * specific. We should probably move that
2845 * into bundirty(). XXX
2846 */
2847 bufobj_wref(bo);
2848 bp->b_flags |= B_ASYNC;
2849 bundirty(bp);
2850 bp->b_flags &= ~B_DONE;
2851 bp->b_ioflags &= ~BIO_ERROR;
2852 bp->b_dirtyoff = bp->b_dirtyend = 0;
2853 bufdone(bp);
2854 }
2855 }
2856 }
2857
2858 /*
2859 * Start/do any write(s) that are required.
2860 */
2861 loop:
2862 BO_LOCK(bo);
2863 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2864 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2865 if (waitfor != MNT_WAIT || passone)
2866 continue;
2867
2868 error = BUF_TIMELOCK(bp,
2869 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
2870 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo);
2871 if (error == 0) {
2872 BUF_UNLOCK(bp);
2873 goto loop;
2874 }
2875 if (error == ENOLCK) {
2876 error = 0;
2877 goto loop;
2878 }
2879 if (called_from_renewthread != 0) {
2880 /*
2881 * Return EIO so the flush will be retried
2882 * later.
2883 */
2884 error = EIO;
2885 goto done;
2886 }
2887 if (newnfs_sigintr(nmp, td)) {
2888 error = EINTR;
2889 goto done;
2890 }
2891 if (slpflag == PCATCH) {
2892 slpflag = 0;
2893 slptimeo = 2 * hz;
2894 }
2895 goto loop;
2896 }
2897 if ((bp->b_flags & B_DELWRI) == 0)
2898 panic("nfs_fsync: not dirty");
2899 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
2900 BUF_UNLOCK(bp);
2901 continue;
2902 }
2903 BO_UNLOCK(bo);
2904 bremfree(bp);
2905 if (passone || !commit)
2906 bp->b_flags |= B_ASYNC;
2907 else
2908 bp->b_flags |= B_ASYNC;
2909 bwrite(bp);
2910 if (newnfs_sigintr(nmp, td)) {
2911 error = EINTR;
2912 goto done;
2913 }
2914 goto loop;
2915 }
2916 if (passone) {
2917 passone = 0;
2918 BO_UNLOCK(bo);
2919 goto again;
2920 }
2921 if (waitfor == MNT_WAIT) {
2922 while (bo->bo_numoutput) {
2923 error = bufobj_wwait(bo, slpflag, slptimeo);
2924 if (error) {
2925 BO_UNLOCK(bo);
2926 if (called_from_renewthread != 0) {
2927 /*
2928 * Return EIO so that the flush will be
2929 * retried later.
2930 */
2931 error = EIO;
2932 goto done;
2933 }
2934 error = newnfs_sigintr(nmp, td);
2935 if (error)
2936 goto done;
2937 if (slpflag == PCATCH) {
2938 slpflag = 0;
2939 slptimeo = 2 * hz;
2940 }
2941 BO_LOCK(bo);
2942 }
2943 }
2944 if (bo->bo_dirty.bv_cnt != 0 && commit) {
2945 BO_UNLOCK(bo);
2946 goto loop;
2947 }
2948 /*
2949 * Wait for all the async IO requests to drain
2950 */
2951 BO_UNLOCK(bo);
2952 mtx_lock(&np->n_mtx);
2953 while (np->n_directio_asyncwr > 0) {
2954 np->n_flag |= NFSYNCWAIT;
2955 error = newnfs_msleep(td, &np->n_directio_asyncwr,
2956 &np->n_mtx, slpflag | (PRIBIO + 1),
2957 "nfsfsync", 0);
2958 if (error) {
2959 if (newnfs_sigintr(nmp, td)) {
2960 mtx_unlock(&np->n_mtx);
2961 error = EINTR;
2962 goto done;
2963 }
2964 }
2965 }
2966 mtx_unlock(&np->n_mtx);
2967 } else
2968 BO_UNLOCK(bo);
2969 if (NFSHASPNFS(nmp)) {
2970 nfscl_layoutcommit(vp, td);
2971 /*
2972 * Invalidate the attribute cache, since writes to a DS
2973 * won't update the size attribute.
2974 */
2975 mtx_lock(&np->n_mtx);
2976 np->n_attrstamp = 0;
2977 } else
2978 mtx_lock(&np->n_mtx);
2979 if (np->n_flag & NWRITEERR) {
2980 error = np->n_error;
2981 np->n_flag &= ~NWRITEERR;
2982 }
2983 if (commit && bo->bo_dirty.bv_cnt == 0 &&
2984 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
2985 np->n_flag &= ~NMODIFIED;
2986 mtx_unlock(&np->n_mtx);
2987 done:
2988 if (bvec != NULL && bvec != bvec_on_stack)
2989 free(bvec, M_TEMP);
2990 if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
2991 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 ||
2992 np->n_directio_asyncwr != 0)) {
2993 if (trycnt++ < 5) {
2994 /* try, try again... */
2995 passone = 1;
2996 wcred = NULL;
2997 bvec = NULL;
2998 bvecsize = 0;
2999 goto again;
3000 }
3001 vn_printf(vp, "ncl_flush failed");
3002 error = called_from_renewthread != 0 ? EIO : EBUSY;
3003 }
3004 return (error);
3005 }
3006
3007 /*
3008 * NFS advisory byte-level locks.
3009 */
3010 static int
nfs_advlock(struct vop_advlock_args * ap)3011 nfs_advlock(struct vop_advlock_args *ap)
3012 {
3013 struct vnode *vp = ap->a_vp;
3014 struct ucred *cred;
3015 struct nfsnode *np = VTONFS(ap->a_vp);
3016 struct proc *p = (struct proc *)ap->a_id;
3017 struct thread *td = curthread; /* XXX */
3018 struct vattr va;
3019 int ret, error = EOPNOTSUPP;
3020 u_quad_t size;
3021
3022 ret = NFSVOPLOCK(vp, LK_SHARED);
3023 if (ret != 0)
3024 return (EBADF);
3025 if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
3026 if (vp->v_type != VREG) {
3027 NFSVOPUNLOCK(vp, 0);
3028 return (EINVAL);
3029 }
3030 if ((ap->a_flags & F_POSIX) != 0)
3031 cred = p->p_ucred;
3032 else
3033 cred = td->td_ucred;
3034 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
3035 if (vp->v_iflag & VI_DOOMED) {
3036 NFSVOPUNLOCK(vp, 0);
3037 return (EBADF);
3038 }
3039
3040 /*
3041 * If this is unlocking a write locked region, flush and
3042 * commit them before unlocking. This is required by
3043 * RFC3530 Sec. 9.3.2.
3044 */
3045 if (ap->a_op == F_UNLCK &&
3046 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
3047 ap->a_flags))
3048 (void) ncl_flush(vp, MNT_WAIT, td, 1, 0);
3049
3050 /*
3051 * Loop around doing the lock op, while a blocking lock
3052 * must wait for the lock op to succeed.
3053 */
3054 do {
3055 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
3056 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
3057 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3058 ap->a_op == F_SETLK) {
3059 NFSVOPUNLOCK(vp, 0);
3060 error = nfs_catnap(PZERO | PCATCH, ret,
3061 "ncladvl");
3062 if (error)
3063 return (EINTR);
3064 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
3065 if (vp->v_iflag & VI_DOOMED) {
3066 NFSVOPUNLOCK(vp, 0);
3067 return (EBADF);
3068 }
3069 }
3070 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3071 ap->a_op == F_SETLK);
3072 if (ret == NFSERR_DENIED) {
3073 NFSVOPUNLOCK(vp, 0);
3074 return (EAGAIN);
3075 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
3076 NFSVOPUNLOCK(vp, 0);
3077 return (ret);
3078 } else if (ret != 0) {
3079 NFSVOPUNLOCK(vp, 0);
3080 return (EACCES);
3081 }
3082
3083 /*
3084 * Now, if we just got a lock, invalidate data in the buffer
3085 * cache, as required, so that the coherency conforms with
3086 * RFC3530 Sec. 9.3.2.
3087 */
3088 if (ap->a_op == F_SETLK) {
3089 if ((np->n_flag & NMODIFIED) == 0) {
3090 np->n_attrstamp = 0;
3091 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3092 ret = VOP_GETATTR(vp, &va, cred);
3093 }
3094 if ((np->n_flag & NMODIFIED) || ret ||
3095 np->n_change != va.va_filerev) {
3096 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
3097 np->n_attrstamp = 0;
3098 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3099 ret = VOP_GETATTR(vp, &va, cred);
3100 if (!ret) {
3101 np->n_mtime = va.va_mtime;
3102 np->n_change = va.va_filerev;
3103 }
3104 }
3105 /* Mark that a file lock has been acquired. */
3106 mtx_lock(&np->n_mtx);
3107 np->n_flag |= NHASBEENLOCKED;
3108 mtx_unlock(&np->n_mtx);
3109 }
3110 NFSVOPUNLOCK(vp, 0);
3111 return (0);
3112 } else if (!NFS_ISV4(vp)) {
3113 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
3114 size = VTONFS(vp)->n_size;
3115 NFSVOPUNLOCK(vp, 0);
3116 error = lf_advlock(ap, &(vp->v_lockf), size);
3117 } else {
3118 if (nfs_advlock_p != NULL)
3119 error = nfs_advlock_p(ap);
3120 else {
3121 NFSVOPUNLOCK(vp, 0);
3122 error = ENOLCK;
3123 }
3124 }
3125 if (error == 0 && ap->a_op == F_SETLK) {
3126 error = NFSVOPLOCK(vp, LK_SHARED);
3127 if (error == 0) {
3128 /* Mark that a file lock has been acquired. */
3129 mtx_lock(&np->n_mtx);
3130 np->n_flag |= NHASBEENLOCKED;
3131 mtx_unlock(&np->n_mtx);
3132 NFSVOPUNLOCK(vp, 0);
3133 }
3134 }
3135 } else
3136 NFSVOPUNLOCK(vp, 0);
3137 return (error);
3138 }
3139
3140 /*
3141 * NFS advisory byte-level locks.
3142 */
3143 static int
nfs_advlockasync(struct vop_advlockasync_args * ap)3144 nfs_advlockasync(struct vop_advlockasync_args *ap)
3145 {
3146 struct vnode *vp = ap->a_vp;
3147 u_quad_t size;
3148 int error;
3149
3150 if (NFS_ISV4(vp))
3151 return (EOPNOTSUPP);
3152 error = NFSVOPLOCK(vp, LK_SHARED);
3153 if (error)
3154 return (error);
3155 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
3156 size = VTONFS(vp)->n_size;
3157 NFSVOPUNLOCK(vp, 0);
3158 error = lf_advlockasync(ap, &(vp->v_lockf), size);
3159 } else {
3160 NFSVOPUNLOCK(vp, 0);
3161 error = EOPNOTSUPP;
3162 }
3163 return (error);
3164 }
3165
3166 /*
3167 * Print out the contents of an nfsnode.
3168 */
3169 static int
nfs_print(struct vop_print_args * ap)3170 nfs_print(struct vop_print_args *ap)
3171 {
3172 struct vnode *vp = ap->a_vp;
3173 struct nfsnode *np = VTONFS(vp);
3174
3175 printf("\tfileid %ld fsid 0x%x", np->n_vattr.na_fileid,
3176 np->n_vattr.na_fsid);
3177 if (vp->v_type == VFIFO)
3178 fifo_printinfo(vp);
3179 printf("\n");
3180 return (0);
3181 }
3182
3183 /*
3184 * This is the "real" nfs::bwrite(struct buf*).
3185 * We set B_CACHE if this is a VMIO buffer.
3186 */
3187 int
ncl_writebp(struct buf * bp,int force __unused,struct thread * td)3188 ncl_writebp(struct buf *bp, int force __unused, struct thread *td)
3189 {
3190 int s;
3191 int oldflags = bp->b_flags;
3192 #if 0
3193 int retv = 1;
3194 off_t off;
3195 #endif
3196
3197 BUF_ASSERT_HELD(bp);
3198
3199 if (bp->b_flags & B_INVAL) {
3200 brelse(bp);
3201 return(0);
3202 }
3203
3204 bp->b_flags |= B_CACHE;
3205
3206 /*
3207 * Undirty the bp. We will redirty it later if the I/O fails.
3208 */
3209
3210 s = splbio();
3211 bundirty(bp);
3212 bp->b_flags &= ~B_DONE;
3213 bp->b_ioflags &= ~BIO_ERROR;
3214 bp->b_iocmd = BIO_WRITE;
3215
3216 bufobj_wref(bp->b_bufobj);
3217 curthread->td_ru.ru_oublock++;
3218 splx(s);
3219
3220 /*
3221 * Note: to avoid loopback deadlocks, we do not
3222 * assign b_runningbufspace.
3223 */
3224 vfs_busy_pages(bp, 1);
3225
3226 BUF_KERNPROC(bp);
3227 bp->b_iooffset = dbtob(bp->b_blkno);
3228 bstrategy(bp);
3229
3230 if( (oldflags & B_ASYNC) == 0) {
3231 int rtval = bufwait(bp);
3232
3233 if (oldflags & B_DELWRI) {
3234 s = splbio();
3235 reassignbuf(bp);
3236 splx(s);
3237 }
3238 brelse(bp);
3239 return (rtval);
3240 }
3241
3242 return (0);
3243 }
3244
3245 /*
3246 * nfs special file access vnode op.
3247 * Essentially just get vattr and then imitate iaccess() since the device is
3248 * local to the client.
3249 */
3250 static int
nfsspec_access(struct vop_access_args * ap)3251 nfsspec_access(struct vop_access_args *ap)
3252 {
3253 struct vattr *vap;
3254 struct ucred *cred = ap->a_cred;
3255 struct vnode *vp = ap->a_vp;
3256 accmode_t accmode = ap->a_accmode;
3257 struct vattr vattr;
3258 int error;
3259
3260 /*
3261 * Disallow write attempts on filesystems mounted read-only;
3262 * unless the file is a socket, fifo, or a block or character
3263 * device resident on the filesystem.
3264 */
3265 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
3266 switch (vp->v_type) {
3267 case VREG:
3268 case VDIR:
3269 case VLNK:
3270 return (EROFS);
3271 default:
3272 break;
3273 }
3274 }
3275 vap = &vattr;
3276 error = VOP_GETATTR(vp, vap, cred);
3277 if (error)
3278 goto out;
3279 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
3280 accmode, cred, NULL);
3281 out:
3282 return error;
3283 }
3284
3285 /*
3286 * Read wrapper for fifos.
3287 */
3288 static int
nfsfifo_read(struct vop_read_args * ap)3289 nfsfifo_read(struct vop_read_args *ap)
3290 {
3291 struct nfsnode *np = VTONFS(ap->a_vp);
3292 int error;
3293
3294 /*
3295 * Set access flag.
3296 */
3297 mtx_lock(&np->n_mtx);
3298 np->n_flag |= NACC;
3299 vfs_timestamp(&np->n_atim);
3300 mtx_unlock(&np->n_mtx);
3301 error = fifo_specops.vop_read(ap);
3302 return error;
3303 }
3304
3305 /*
3306 * Write wrapper for fifos.
3307 */
3308 static int
nfsfifo_write(struct vop_write_args * ap)3309 nfsfifo_write(struct vop_write_args *ap)
3310 {
3311 struct nfsnode *np = VTONFS(ap->a_vp);
3312
3313 /*
3314 * Set update flag.
3315 */
3316 mtx_lock(&np->n_mtx);
3317 np->n_flag |= NUPD;
3318 vfs_timestamp(&np->n_mtim);
3319 mtx_unlock(&np->n_mtx);
3320 return(fifo_specops.vop_write(ap));
3321 }
3322
3323 /*
3324 * Close wrapper for fifos.
3325 *
3326 * Update the times on the nfsnode then do fifo close.
3327 */
3328 static int
nfsfifo_close(struct vop_close_args * ap)3329 nfsfifo_close(struct vop_close_args *ap)
3330 {
3331 struct vnode *vp = ap->a_vp;
3332 struct nfsnode *np = VTONFS(vp);
3333 struct vattr vattr;
3334 struct timespec ts;
3335
3336 mtx_lock(&np->n_mtx);
3337 if (np->n_flag & (NACC | NUPD)) {
3338 vfs_timestamp(&ts);
3339 if (np->n_flag & NACC)
3340 np->n_atim = ts;
3341 if (np->n_flag & NUPD)
3342 np->n_mtim = ts;
3343 np->n_flag |= NCHG;
3344 if (vrefcnt(vp) == 1 &&
3345 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
3346 VATTR_NULL(&vattr);
3347 if (np->n_flag & NACC)
3348 vattr.va_atime = np->n_atim;
3349 if (np->n_flag & NUPD)
3350 vattr.va_mtime = np->n_mtim;
3351 mtx_unlock(&np->n_mtx);
3352 (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
3353 goto out;
3354 }
3355 }
3356 mtx_unlock(&np->n_mtx);
3357 out:
3358 return (fifo_specops.vop_close(ap));
3359 }
3360
3361 /*
3362 * Just call ncl_writebp() with the force argument set to 1.
3363 *
3364 * NOTE: B_DONE may or may not be set in a_bp on call.
3365 */
3366 static int
nfs_bwrite(struct buf * bp)3367 nfs_bwrite(struct buf *bp)
3368 {
3369
3370 return (ncl_writebp(bp, 1, curthread));
3371 }
3372
3373 struct buf_ops buf_ops_newnfs = {
3374 .bop_name = "buf_ops_nfs",
3375 .bop_write = nfs_bwrite,
3376 .bop_strategy = bufstrategy,
3377 .bop_sync = bufsync,
3378 .bop_bdflush = bufbdflush,
3379 };
3380
3381 static int
nfs_getacl(struct vop_getacl_args * ap)3382 nfs_getacl(struct vop_getacl_args *ap)
3383 {
3384 int error;
3385
3386 if (ap->a_type != ACL_TYPE_NFS4)
3387 return (EOPNOTSUPP);
3388 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
3389 NULL);
3390 if (error > NFSERR_STALE) {
3391 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3392 error = EPERM;
3393 }
3394 return (error);
3395 }
3396
3397 static int
nfs_setacl(struct vop_setacl_args * ap)3398 nfs_setacl(struct vop_setacl_args *ap)
3399 {
3400 int error;
3401
3402 if (ap->a_type != ACL_TYPE_NFS4)
3403 return (EOPNOTSUPP);
3404 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
3405 NULL);
3406 if (error > NFSERR_STALE) {
3407 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3408 error = EPERM;
3409 }
3410 return (error);
3411 }
3412
3413 static int
nfs_set_text(struct vop_set_text_args * ap)3414 nfs_set_text(struct vop_set_text_args *ap)
3415 {
3416 struct vnode *vp = ap->a_vp;
3417 struct nfsnode *np;
3418
3419 /*
3420 * If the text file has been mmap'd, flush any dirty pages to the
3421 * buffer cache and then...
3422 * Make sure all writes are pushed to the NFS server. If this is not
3423 * done, the modify time of the file can change while the text
3424 * file is being executed. This will cause the process that is
3425 * executing the text file to be terminated.
3426 */
3427 if (vp->v_object != NULL) {
3428 VM_OBJECT_WLOCK(vp->v_object);
3429 vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
3430 VM_OBJECT_WUNLOCK(vp->v_object);
3431 }
3432
3433 /* And, finally, make sure that n_mtime is up to date. */
3434 np = VTONFS(vp);
3435 mtx_lock(&np->n_mtx);
3436 np->n_mtime = np->n_vattr.na_mtime;
3437 mtx_unlock(&np->n_mtx);
3438
3439 vp->v_vflag |= VV_TEXT;
3440 return (0);
3441 }
3442
3443 /*
3444 * Return POSIX pathconf information applicable to nfs filesystems.
3445 */
3446 static int
nfs_pathconf(struct vop_pathconf_args * ap)3447 nfs_pathconf(struct vop_pathconf_args *ap)
3448 {
3449 struct nfsv3_pathconf pc;
3450 struct nfsvattr nfsva;
3451 struct vnode *vp = ap->a_vp;
3452 struct thread *td = curthread;
3453 int attrflag, error;
3454
3455 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX ||
3456 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
3457 ap->a_name == _PC_NO_TRUNC)) ||
3458 (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) {
3459 /*
3460 * Since only the above 4 a_names are returned by the NFSv3
3461 * Pathconf RPC, there is no point in doing it for others.
3462 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can
3463 * be used for _PC_NFS4_ACL as well.
3464 */
3465 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva,
3466 &attrflag, NULL);
3467 if (attrflag != 0)
3468 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
3469 1);
3470 if (error != 0)
3471 return (error);
3472 } else {
3473 /*
3474 * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
3475 * just fake them.
3476 */
3477 pc.pc_linkmax = LINK_MAX;
3478 pc.pc_namemax = NFS_MAXNAMLEN;
3479 pc.pc_notrunc = 1;
3480 pc.pc_chownrestricted = 1;
3481 pc.pc_caseinsensitive = 0;
3482 pc.pc_casepreserving = 1;
3483 error = 0;
3484 }
3485 switch (ap->a_name) {
3486 case _PC_LINK_MAX:
3487 *ap->a_retval = pc.pc_linkmax;
3488 break;
3489 case _PC_NAME_MAX:
3490 *ap->a_retval = pc.pc_namemax;
3491 break;
3492 case _PC_PATH_MAX:
3493 *ap->a_retval = PATH_MAX;
3494 break;
3495 case _PC_PIPE_BUF:
3496 *ap->a_retval = PIPE_BUF;
3497 break;
3498 case _PC_CHOWN_RESTRICTED:
3499 *ap->a_retval = pc.pc_chownrestricted;
3500 break;
3501 case _PC_NO_TRUNC:
3502 *ap->a_retval = pc.pc_notrunc;
3503 break;
3504 case _PC_ACL_EXTENDED:
3505 *ap->a_retval = 0;
3506 break;
3507 case _PC_ACL_NFS4:
3508 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
3509 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
3510 *ap->a_retval = 1;
3511 else
3512 *ap->a_retval = 0;
3513 break;
3514 case _PC_ACL_PATH_MAX:
3515 if (NFS_ISV4(vp))
3516 *ap->a_retval = ACL_MAX_ENTRIES;
3517 else
3518 *ap->a_retval = 3;
3519 break;
3520 case _PC_MAC_PRESENT:
3521 *ap->a_retval = 0;
3522 break;
3523 case _PC_ASYNC_IO:
3524 /* _PC_ASYNC_IO should have been handled by upper layers. */
3525 KASSERT(0, ("_PC_ASYNC_IO should not get here"));
3526 error = EINVAL;
3527 break;
3528 case _PC_PRIO_IO:
3529 *ap->a_retval = 0;
3530 break;
3531 case _PC_SYNC_IO:
3532 *ap->a_retval = 0;
3533 break;
3534 case _PC_ALLOC_SIZE_MIN:
3535 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
3536 break;
3537 case _PC_FILESIZEBITS:
3538 if (NFS_ISV34(vp))
3539 *ap->a_retval = 64;
3540 else
3541 *ap->a_retval = 32;
3542 break;
3543 case _PC_REC_INCR_XFER_SIZE:
3544 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
3545 break;
3546 case _PC_REC_MAX_XFER_SIZE:
3547 *ap->a_retval = -1; /* means ``unlimited'' */
3548 break;
3549 case _PC_REC_MIN_XFER_SIZE:
3550 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
3551 break;
3552 case _PC_REC_XFER_ALIGN:
3553 *ap->a_retval = PAGE_SIZE;
3554 break;
3555 case _PC_SYMLINK_MAX:
3556 *ap->a_retval = NFS_MAXPATHLEN;
3557 break;
3558
3559 default:
3560 error = EINVAL;
3561 break;
3562 }
3563 return (error);
3564 }
3565
3566