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 * @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: stable/10/sys/nfsclient/nfs_vnops.c 276500 2015-01-01 10:44:20Z kib $");
37
38 /*
39 * vnode op calls for Sun NFS version 2 and 3
40 */
41
42 #include "opt_inet.h"
43 #include "opt_kdtrace.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 <nfs/nfsproto.h>
71 #include <nfsclient/nfs.h>
72 #include <nfsclient/nfsnode.h>
73 #include <nfsclient/nfsmount.h>
74 #include <nfs/nfs_kdtrace.h>
75 #include <nfs/nfs_lock.h>
76 #include <nfs/xdr_subs.h>
77 #include <nfsclient/nfsm_subs.h>
78
79 #include <net/if.h>
80 #include <netinet/in.h>
81 #include <netinet/in_var.h>
82
83 #include <machine/stdarg.h>
84
85 #ifdef KDTRACE_HOOKS
86 #include <sys/dtrace_bsd.h>
87
88 dtrace_nfsclient_accesscache_flush_probe_func_t
89 dtrace_nfsclient_accesscache_flush_done_probe;
90 uint32_t nfsclient_accesscache_flush_done_id;
91
92 dtrace_nfsclient_accesscache_get_probe_func_t
93 dtrace_nfsclient_accesscache_get_hit_probe,
94 dtrace_nfsclient_accesscache_get_miss_probe;
95 uint32_t nfsclient_accesscache_get_hit_id;
96 uint32_t nfsclient_accesscache_get_miss_id;
97
98 dtrace_nfsclient_accesscache_load_probe_func_t
99 dtrace_nfsclient_accesscache_load_done_probe;
100 uint32_t nfsclient_accesscache_load_done_id;
101 #endif /* !KDTRACE_HOOKS */
102
103 /* Defs */
104 #define TRUE 1
105 #define FALSE 0
106
107 /*
108 * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
109 * calls are not in getblk() and brelse() so that they would not be necessary
110 * here.
111 */
112 #ifndef B_VMIO
113 #define vfs_busy_pages(bp, f)
114 #endif
115
116 static vop_read_t nfsfifo_read;
117 static vop_write_t nfsfifo_write;
118 static vop_close_t nfsfifo_close;
119 static int nfs_flush(struct vnode *, int, int);
120 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *);
121 static vop_lookup_t nfs_lookup;
122 static vop_create_t nfs_create;
123 static vop_mknod_t nfs_mknod;
124 static vop_open_t nfs_open;
125 static vop_close_t nfs_close;
126 static vop_access_t nfs_access;
127 static vop_getattr_t nfs_getattr;
128 static vop_setattr_t nfs_setattr;
129 static vop_read_t nfs_read;
130 static vop_fsync_t nfs_fsync;
131 static vop_remove_t nfs_remove;
132 static vop_link_t nfs_link;
133 static vop_rename_t nfs_rename;
134 static vop_mkdir_t nfs_mkdir;
135 static vop_rmdir_t nfs_rmdir;
136 static vop_symlink_t nfs_symlink;
137 static vop_readdir_t nfs_readdir;
138 static vop_strategy_t nfs_strategy;
139 static int nfs_lookitup(struct vnode *, const char *, int,
140 struct ucred *, struct thread *, struct nfsnode **);
141 static int nfs_sillyrename(struct vnode *, struct vnode *,
142 struct componentname *);
143 static vop_access_t nfsspec_access;
144 static vop_readlink_t nfs_readlink;
145 static vop_print_t nfs_print;
146 static vop_advlock_t nfs_advlock;
147 static vop_advlockasync_t nfs_advlockasync;
148
149 /*
150 * Global vfs data structures for nfs
151 */
152 struct vop_vector nfs_vnodeops = {
153 .vop_default = &default_vnodeops,
154 .vop_access = nfs_access,
155 .vop_advlock = nfs_advlock,
156 .vop_advlockasync = nfs_advlockasync,
157 .vop_close = nfs_close,
158 .vop_create = nfs_create,
159 .vop_fsync = nfs_fsync,
160 .vop_getattr = nfs_getattr,
161 .vop_getpages = nfs_getpages,
162 .vop_putpages = nfs_putpages,
163 .vop_inactive = nfs_inactive,
164 .vop_link = nfs_link,
165 .vop_lookup = nfs_lookup,
166 .vop_mkdir = nfs_mkdir,
167 .vop_mknod = nfs_mknod,
168 .vop_open = nfs_open,
169 .vop_print = nfs_print,
170 .vop_read = nfs_read,
171 .vop_readdir = nfs_readdir,
172 .vop_readlink = nfs_readlink,
173 .vop_reclaim = nfs_reclaim,
174 .vop_remove = nfs_remove,
175 .vop_rename = nfs_rename,
176 .vop_rmdir = nfs_rmdir,
177 .vop_setattr = nfs_setattr,
178 .vop_strategy = nfs_strategy,
179 .vop_symlink = nfs_symlink,
180 .vop_write = nfs_write,
181 };
182
183 struct vop_vector nfs_fifoops = {
184 .vop_default = &fifo_specops,
185 .vop_access = nfsspec_access,
186 .vop_close = nfsfifo_close,
187 .vop_fsync = nfs_fsync,
188 .vop_getattr = nfs_getattr,
189 .vop_inactive = nfs_inactive,
190 .vop_print = nfs_print,
191 .vop_read = nfsfifo_read,
192 .vop_reclaim = nfs_reclaim,
193 .vop_setattr = nfs_setattr,
194 .vop_write = nfsfifo_write,
195 };
196
197 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
198 struct componentname *cnp, struct vattr *vap);
199 static int nfs_removerpc(struct vnode *dvp, const char *name, int namelen,
200 struct ucred *cred, struct thread *td);
201 static int nfs_renamerpc(struct vnode *fdvp, const char *fnameptr,
202 int fnamelen, struct vnode *tdvp,
203 const char *tnameptr, int tnamelen,
204 struct ucred *cred, struct thread *td);
205 static int nfs_renameit(struct vnode *sdvp, struct componentname *scnp,
206 struct sillyrename *sp);
207
208 /*
209 * Global variables
210 */
211 struct mtx nfs_iod_mtx;
212 enum nfsiod_state nfs_iodwant[NFS_MAXASYNCDAEMON];
213 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON];
214 int nfs_numasync = 0;
215 #define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1))
216
217 SYSCTL_DECL(_vfs_oldnfs);
218
219 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
220 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
221 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
222
223 static int nfs_prime_access_cache = 0;
224 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
225 &nfs_prime_access_cache, 0,
226 "Prime NFS ACCESS cache when fetching attributes");
227
228 static int nfsv3_commit_on_close = 0;
229 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW,
230 &nfsv3_commit_on_close, 0, "write+commit on close, else only write");
231
232 static int nfs_clean_pages_on_close = 1;
233 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
234 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
235
236 int nfs_directio_enable = 0;
237 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
238 &nfs_directio_enable, 0, "Enable NFS directio");
239
240 /*
241 * This sysctl allows other processes to mmap a file that has been opened
242 * O_DIRECT by a process. In general, having processes mmap the file while
243 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow
244 * this by default to prevent DoS attacks - to prevent a malicious user from
245 * opening up files O_DIRECT preventing other users from mmap'ing these
246 * files. "Protected" environments where stricter consistency guarantees are
247 * required can disable this knob. The process that opened the file O_DIRECT
248 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
249 * meaningful.
250 */
251 int nfs_directio_allow_mmap = 1;
252 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
253 &nfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
254
255 #if 0
256 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, access_cache_hits, CTLFLAG_RD,
257 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
258
259 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, access_cache_misses, CTLFLAG_RD,
260 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
261 #endif
262
263 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \
264 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \
265 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP)
266
267 /*
268 * SMP Locking Note :
269 * The list of locks after the description of the lock is the ordering
270 * of other locks acquired with the lock held.
271 * np->n_mtx : Protects the fields in the nfsnode.
272 VM Object Lock
273 VI_MTX (acquired indirectly)
274 * nmp->nm_mtx : Protects the fields in the nfsmount.
275 rep->r_mtx
276 * nfs_iod_mtx : Global lock, protects shared nfsiod state.
277 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
278 nmp->nm_mtx
279 rep->r_mtx
280 * rep->r_mtx : Protects the fields in an nfsreq.
281 */
282
283 static int
nfs3_access_otw(struct vnode * vp,int wmode,struct thread * td,struct ucred * cred,uint32_t * retmode)284 nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td,
285 struct ucred *cred, uint32_t *retmode)
286 {
287 const int v3 = 1;
288 u_int32_t *tl;
289 int error = 0, attrflag, i, lrupos;
290
291 struct mbuf *mreq, *mrep, *md, *mb;
292 caddr_t bpos, dpos;
293 u_int32_t rmode;
294 struct nfsnode *np = VTONFS(vp);
295
296 nfsstats.rpccnt[NFSPROC_ACCESS]++;
297 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED, M_WAITOK, MT_DATA, 0);
298 mb = mreq;
299 bpos = mtod(mb, caddr_t);
300 nfsm_fhtom(vp, v3);
301 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
302 *tl = txdr_unsigned(wmode);
303 nfsm_request(vp, NFSPROC_ACCESS, td, cred);
304 nfsm_postop_attr(vp, attrflag);
305 if (!error) {
306 lrupos = 0;
307 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
308 rmode = fxdr_unsigned(u_int32_t, *tl);
309 mtx_lock(&np->n_mtx);
310 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
311 if (np->n_accesscache[i].uid == cred->cr_uid) {
312 np->n_accesscache[i].mode = rmode;
313 np->n_accesscache[i].stamp = time_second;
314 break;
315 }
316 if (i > 0 && np->n_accesscache[i].stamp <
317 np->n_accesscache[lrupos].stamp)
318 lrupos = i;
319 }
320 if (i == NFS_ACCESSCACHESIZE) {
321 np->n_accesscache[lrupos].uid = cred->cr_uid;
322 np->n_accesscache[lrupos].mode = rmode;
323 np->n_accesscache[lrupos].stamp = time_second;
324 }
325 mtx_unlock(&np->n_mtx);
326 if (retmode != NULL)
327 *retmode = rmode;
328 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0);
329 }
330 m_freem(mrep);
331 nfsmout:
332 #ifdef KDTRACE_HOOKS
333 if (error) {
334 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0,
335 error);
336 }
337 #endif
338 return (error);
339 }
340
341 /*
342 * nfs access vnode op.
343 * For nfs version 2, just return ok. File accesses may fail later.
344 * For nfs version 3, use the access rpc to check accessibility. If file modes
345 * are changed on the server, accesses might still fail later.
346 */
347 static int
nfs_access(struct vop_access_args * ap)348 nfs_access(struct vop_access_args *ap)
349 {
350 struct vnode *vp = ap->a_vp;
351 int error = 0, i, gotahit;
352 u_int32_t mode, rmode, wmode;
353 int v3 = NFS_ISV3(vp);
354 struct nfsnode *np = VTONFS(vp);
355
356 /*
357 * Disallow write attempts on filesystems mounted read-only;
358 * unless the file is a socket, fifo, or a block or character
359 * device resident on the filesystem.
360 */
361 if ((ap->a_accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
362 switch (vp->v_type) {
363 case VREG:
364 case VDIR:
365 case VLNK:
366 return (EROFS);
367 default:
368 break;
369 }
370 }
371 /*
372 * For nfs v3, check to see if we have done this recently, and if
373 * so return our cached result instead of making an ACCESS call.
374 * If not, do an access rpc, otherwise you are stuck emulating
375 * ufs_access() locally using the vattr. This may not be correct,
376 * since the server may apply other access criteria such as
377 * client uid-->server uid mapping that we do not know about.
378 */
379 if (v3) {
380 if (ap->a_accmode & VREAD)
381 mode = NFSV3ACCESS_READ;
382 else
383 mode = 0;
384 if (vp->v_type != VDIR) {
385 if (ap->a_accmode & VWRITE)
386 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND);
387 if (ap->a_accmode & VEXEC)
388 mode |= NFSV3ACCESS_EXECUTE;
389 } else {
390 if (ap->a_accmode & VWRITE)
391 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND |
392 NFSV3ACCESS_DELETE);
393 if (ap->a_accmode & VEXEC)
394 mode |= NFSV3ACCESS_LOOKUP;
395 }
396 /* XXX safety belt, only make blanket request if caching */
397 if (nfsaccess_cache_timeout > 0) {
398 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY |
399 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE |
400 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP;
401 } else {
402 wmode = mode;
403 }
404
405 /*
406 * Does our cached result allow us to give a definite yes to
407 * this request?
408 */
409 gotahit = 0;
410 mtx_lock(&np->n_mtx);
411 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
412 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
413 if (time_second < (np->n_accesscache[i].stamp +
414 nfsaccess_cache_timeout) &&
415 (np->n_accesscache[i].mode & mode) == mode) {
416 nfsstats.accesscache_hits++;
417 gotahit = 1;
418 }
419 break;
420 }
421 }
422 mtx_unlock(&np->n_mtx);
423 #ifdef KDTRACE_HOOKS
424 if (gotahit)
425 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp,
426 ap->a_cred->cr_uid, mode);
427 else
428 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp,
429 ap->a_cred->cr_uid, mode);
430 #endif
431 if (gotahit == 0) {
432 /*
433 * Either a no, or a don't know. Go to the wire.
434 */
435 nfsstats.accesscache_misses++;
436 error = nfs3_access_otw(vp, wmode, ap->a_td, ap->a_cred,
437 &rmode);
438 if (!error) {
439 if ((rmode & mode) != mode)
440 error = EACCES;
441 }
442 }
443 return (error);
444 } else {
445 if ((error = nfsspec_access(ap)) != 0) {
446 return (error);
447 }
448 /*
449 * Attempt to prevent a mapped root from accessing a file
450 * which it shouldn't. We try to read a byte from the file
451 * if the user is root and the file is not zero length.
452 * After calling nfsspec_access, we should have the correct
453 * file size cached.
454 */
455 mtx_lock(&np->n_mtx);
456 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
457 && VTONFS(vp)->n_size > 0) {
458 struct iovec aiov;
459 struct uio auio;
460 char buf[1];
461
462 mtx_unlock(&np->n_mtx);
463 aiov.iov_base = buf;
464 aiov.iov_len = 1;
465 auio.uio_iov = &aiov;
466 auio.uio_iovcnt = 1;
467 auio.uio_offset = 0;
468 auio.uio_resid = 1;
469 auio.uio_segflg = UIO_SYSSPACE;
470 auio.uio_rw = UIO_READ;
471 auio.uio_td = ap->a_td;
472
473 if (vp->v_type == VREG)
474 error = nfs_readrpc(vp, &auio, ap->a_cred);
475 else if (vp->v_type == VDIR) {
476 char* bp;
477 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
478 aiov.iov_base = bp;
479 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
480 error = nfs_readdirrpc(vp, &auio, ap->a_cred);
481 free(bp, M_TEMP);
482 } else if (vp->v_type == VLNK)
483 error = nfs_readlinkrpc(vp, &auio, ap->a_cred);
484 else
485 error = EACCES;
486 } else
487 mtx_unlock(&np->n_mtx);
488 return (error);
489 }
490 }
491
492 int nfs_otw_getattr_avoid = 0;
493
494 /*
495 * nfs open vnode op
496 * Check to see if the type is ok
497 * and that deletion is not in progress.
498 * For paged in text files, you will need to flush the page cache
499 * if consistency is lost.
500 */
501 /* ARGSUSED */
502 static int
nfs_open(struct vop_open_args * ap)503 nfs_open(struct vop_open_args *ap)
504 {
505 struct vnode *vp = ap->a_vp;
506 struct nfsnode *np = VTONFS(vp);
507 struct vattr vattr;
508 int error;
509 int fmode = ap->a_mode;
510 struct ucred *cred;
511
512 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
513 return (EOPNOTSUPP);
514
515 /*
516 * Get a valid lease. If cached data is stale, flush it.
517 */
518 mtx_lock(&np->n_mtx);
519 if (np->n_flag & NMODIFIED) {
520 mtx_unlock(&np->n_mtx);
521 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
522 if (error == EINTR || error == EIO)
523 return (error);
524 mtx_lock(&np->n_mtx);
525 np->n_attrstamp = 0;
526 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
527 if (vp->v_type == VDIR)
528 np->n_direofoffset = 0;
529 mtx_unlock(&np->n_mtx);
530 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
531 if (error)
532 return (error);
533 mtx_lock(&np->n_mtx);
534 np->n_mtime = vattr.va_mtime;
535 } else {
536 mtx_unlock(&np->n_mtx);
537 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
538 if (error)
539 return (error);
540 mtx_lock(&np->n_mtx);
541 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
542 if (vp->v_type == VDIR)
543 np->n_direofoffset = 0;
544 mtx_unlock(&np->n_mtx);
545 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
546 if (error == EINTR || error == EIO) {
547 return (error);
548 }
549 mtx_lock(&np->n_mtx);
550 np->n_mtime = vattr.va_mtime;
551 }
552 }
553 /*
554 * If the object has >= 1 O_DIRECT active opens, we disable caching.
555 */
556 if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
557 if (np->n_directio_opens == 0) {
558 mtx_unlock(&np->n_mtx);
559 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
560 if (error)
561 return (error);
562 mtx_lock(&np->n_mtx);
563 np->n_flag |= NNONCACHE;
564 }
565 np->n_directio_opens++;
566 }
567
568 /*
569 * If this is an open for writing, capture a reference to the
570 * credentials, so they can be used by nfs_putpages(). Using
571 * these write credentials is preferable to the credentials of
572 * whatever thread happens to be doing the VOP_PUTPAGES() since
573 * the write RPCs are less likely to fail with EACCES.
574 */
575 if ((fmode & FWRITE) != 0) {
576 cred = np->n_writecred;
577 np->n_writecred = crhold(ap->a_cred);
578 } else
579 cred = NULL;
580 mtx_unlock(&np->n_mtx);
581 if (cred != NULL)
582 crfree(cred);
583 vnode_create_vobject(vp, vattr.va_size, ap->a_td);
584 return (0);
585 }
586
587 /*
588 * nfs close vnode op
589 * What an NFS client should do upon close after writing is a debatable issue.
590 * Most NFS clients push delayed writes to the server upon close, basically for
591 * two reasons:
592 * 1 - So that any write errors may be reported back to the client process
593 * doing the close system call. By far the two most likely errors are
594 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
595 * 2 - To put a worst case upper bound on cache inconsistency between
596 * multiple clients for the file.
597 * There is also a consistency problem for Version 2 of the protocol w.r.t.
598 * not being able to tell if other clients are writing a file concurrently,
599 * since there is no way of knowing if the changed modify time in the reply
600 * is only due to the write for this client.
601 * (NFS Version 3 provides weak cache consistency data in the reply that
602 * should be sufficient to detect and handle this case.)
603 *
604 * The current code does the following:
605 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
606 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
607 * or commit them (this satisfies 1 and 2 except for the
608 * case where the server crashes after this close but
609 * before the commit RPC, which is felt to be "good
610 * enough". Changing the last argument to nfs_flush() to
611 * a 1 would force a commit operation, if it is felt a
612 * commit is necessary now.
613 */
614 /* ARGSUSED */
615 static int
nfs_close(struct vop_close_args * ap)616 nfs_close(struct vop_close_args *ap)
617 {
618 struct vnode *vp = ap->a_vp;
619 struct nfsnode *np = VTONFS(vp);
620 int error = 0;
621 int fmode = ap->a_fflag;
622
623 if (vp->v_type == VREG) {
624 /*
625 * Examine and clean dirty pages, regardless of NMODIFIED.
626 * This closes a major hole in close-to-open consistency.
627 * We want to push out all dirty pages (and buffers) on
628 * close, regardless of whether they were dirtied by
629 * mmap'ed writes or via write().
630 */
631 if (nfs_clean_pages_on_close && vp->v_object) {
632 VM_OBJECT_WLOCK(vp->v_object);
633 vm_object_page_clean(vp->v_object, 0, 0, 0);
634 VM_OBJECT_WUNLOCK(vp->v_object);
635 }
636 mtx_lock(&np->n_mtx);
637 if (np->n_flag & NMODIFIED) {
638 mtx_unlock(&np->n_mtx);
639 if (NFS_ISV3(vp)) {
640 /*
641 * Under NFSv3 we have dirty buffers to dispose of. We
642 * must flush them to the NFS server. We have the option
643 * of waiting all the way through the commit rpc or just
644 * waiting for the initial write. The default is to only
645 * wait through the initial write so the data is in the
646 * server's cache, which is roughly similar to the state
647 * a standard disk subsystem leaves the file in on close().
648 *
649 * We cannot clear the NMODIFIED bit in np->n_flag due to
650 * potential races with other processes, and certainly
651 * cannot clear it if we don't commit.
652 */
653 int cm = nfsv3_commit_on_close ? 1 : 0;
654 error = nfs_flush(vp, MNT_WAIT, cm);
655 /* np->n_flag &= ~NMODIFIED; */
656 } else
657 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
658 mtx_lock(&np->n_mtx);
659 }
660 if (np->n_flag & NWRITEERR) {
661 np->n_flag &= ~NWRITEERR;
662 error = np->n_error;
663 }
664 mtx_unlock(&np->n_mtx);
665 }
666 if (nfs_directio_enable)
667 KASSERT((np->n_directio_asyncwr == 0),
668 ("nfs_close: dirty unflushed (%d) directio buffers\n",
669 np->n_directio_asyncwr));
670 if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
671 mtx_lock(&np->n_mtx);
672 KASSERT((np->n_directio_opens > 0),
673 ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
674 np->n_directio_opens--;
675 if (np->n_directio_opens == 0)
676 np->n_flag &= ~NNONCACHE;
677 mtx_unlock(&np->n_mtx);
678 }
679 return (error);
680 }
681
682 /*
683 * nfs getattr call from vfs.
684 */
685 static int
nfs_getattr(struct vop_getattr_args * ap)686 nfs_getattr(struct vop_getattr_args *ap)
687 {
688 struct vnode *vp = ap->a_vp;
689 struct nfsnode *np = VTONFS(vp);
690 struct thread *td = curthread;
691 struct vattr *vap = ap->a_vap;
692 struct vattr vattr;
693 caddr_t bpos, dpos;
694 int error = 0;
695 struct mbuf *mreq, *mrep, *md, *mb;
696 int v3 = NFS_ISV3(vp);
697
698 /*
699 * Update local times for special files.
700 */
701 mtx_lock(&np->n_mtx);
702 if (np->n_flag & (NACC | NUPD))
703 np->n_flag |= NCHG;
704 mtx_unlock(&np->n_mtx);
705 /*
706 * First look in the cache.
707 */
708 if (nfs_getattrcache(vp, &vattr) == 0)
709 goto nfsmout;
710 if (v3 && nfs_prime_access_cache && nfsaccess_cache_timeout > 0) {
711 nfsstats.accesscache_misses++;
712 nfs3_access_otw(vp, NFSV3ACCESS_ALL, td, ap->a_cred, NULL);
713 if (nfs_getattrcache(vp, &vattr) == 0)
714 goto nfsmout;
715 }
716 nfsstats.rpccnt[NFSPROC_GETATTR]++;
717 mreq = m_get2(NFSX_FH(v3), M_WAITOK, MT_DATA, 0);
718 mb = mreq;
719 bpos = mtod(mb, caddr_t);
720 nfsm_fhtom(vp, v3);
721 nfsm_request(vp, NFSPROC_GETATTR, td, ap->a_cred);
722 if (!error) {
723 nfsm_loadattr(vp, &vattr);
724 }
725 m_freem(mrep);
726 nfsmout:
727 vap->va_type = vattr.va_type;
728 vap->va_mode = vattr.va_mode;
729 vap->va_nlink = vattr.va_nlink;
730 vap->va_uid = vattr.va_uid;
731 vap->va_gid = vattr.va_gid;
732 vap->va_fsid = vattr.va_fsid;
733 vap->va_fileid = vattr.va_fileid;
734 vap->va_size = vattr.va_size;
735 vap->va_blocksize = vattr.va_blocksize;
736 vap->va_atime = vattr.va_atime;
737 vap->va_mtime = vattr.va_mtime;
738 vap->va_ctime = vattr.va_ctime;
739 vap->va_gen = vattr.va_gen;
740 vap->va_flags = vattr.va_flags;
741 vap->va_rdev = vattr.va_rdev;
742 vap->va_bytes = vattr.va_bytes;
743 vap->va_filerev = vattr.va_filerev;
744
745 return (error);
746 }
747
748 /*
749 * nfs setattr call.
750 */
751 static int
nfs_setattr(struct vop_setattr_args * ap)752 nfs_setattr(struct vop_setattr_args *ap)
753 {
754 struct vnode *vp = ap->a_vp;
755 struct nfsnode *np = VTONFS(vp);
756 struct vattr *vap = ap->a_vap;
757 struct thread *td = curthread;
758 int error = 0;
759 u_quad_t tsize;
760
761 #ifndef nolint
762 tsize = (u_quad_t)0;
763 #endif
764
765 /*
766 * Setting of flags is not supported.
767 */
768 if (vap->va_flags != VNOVAL)
769 return (EOPNOTSUPP);
770
771 /*
772 * Disallow write attempts if the filesystem is mounted read-only.
773 */
774 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
775 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
776 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
777 (vp->v_mount->mnt_flag & MNT_RDONLY)) {
778 error = EROFS;
779 goto out;
780 }
781 if (vap->va_size != VNOVAL) {
782 switch (vp->v_type) {
783 case VDIR:
784 return (EISDIR);
785 case VCHR:
786 case VBLK:
787 case VSOCK:
788 case VFIFO:
789 if (vap->va_mtime.tv_sec == VNOVAL &&
790 vap->va_atime.tv_sec == VNOVAL &&
791 vap->va_mode == (mode_t)VNOVAL &&
792 vap->va_uid == (uid_t)VNOVAL &&
793 vap->va_gid == (gid_t)VNOVAL)
794 return (0);
795 vap->va_size = VNOVAL;
796 break;
797 default:
798 /*
799 * Disallow write attempts if the filesystem is
800 * mounted read-only.
801 */
802 if (vp->v_mount->mnt_flag & MNT_RDONLY)
803 return (EROFS);
804 /*
805 * We run vnode_pager_setsize() early (why?),
806 * we must set np->n_size now to avoid vinvalbuf
807 * V_SAVE races that might setsize a lower
808 * value.
809 */
810 mtx_lock(&np->n_mtx);
811 tsize = np->n_size;
812 mtx_unlock(&np->n_mtx);
813 error = nfs_meta_setsize(vp, ap->a_cred, td,
814 vap->va_size);
815 mtx_lock(&np->n_mtx);
816 if (np->n_flag & NMODIFIED) {
817 tsize = np->n_size;
818 mtx_unlock(&np->n_mtx);
819 if (vap->va_size == 0)
820 error = nfs_vinvalbuf(vp, 0, td, 1);
821 else
822 error = nfs_vinvalbuf(vp, V_SAVE, td, 1);
823 if (error) {
824 vnode_pager_setsize(vp, tsize);
825 goto out;
826 }
827 } else
828 mtx_unlock(&np->n_mtx);
829 /*
830 * np->n_size has already been set to vap->va_size
831 * in nfs_meta_setsize(). We must set it again since
832 * nfs_loadattrcache() could be called through
833 * nfs_meta_setsize() and could modify np->n_size.
834 */
835 mtx_lock(&np->n_mtx);
836 np->n_vattr.va_size = np->n_size = vap->va_size;
837 mtx_unlock(&np->n_mtx);
838 };
839 } else {
840 mtx_lock(&np->n_mtx);
841 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) &&
842 (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
843 mtx_unlock(&np->n_mtx);
844 if ((error = nfs_vinvalbuf(vp, V_SAVE, td, 1)) != 0 &&
845 (error == EINTR || error == EIO))
846 return error;
847 } else
848 mtx_unlock(&np->n_mtx);
849 }
850 error = nfs_setattrrpc(vp, vap, ap->a_cred);
851 if (error && vap->va_size != VNOVAL) {
852 mtx_lock(&np->n_mtx);
853 np->n_size = np->n_vattr.va_size = tsize;
854 vnode_pager_setsize(vp, tsize);
855 mtx_unlock(&np->n_mtx);
856 }
857 out:
858 return (error);
859 }
860
861 /*
862 * Do an nfs setattr rpc.
863 */
864 static int
nfs_setattrrpc(struct vnode * vp,struct vattr * vap,struct ucred * cred)865 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred)
866 {
867 struct nfsv2_sattr *sp;
868 struct nfsnode *np = VTONFS(vp);
869 caddr_t bpos, dpos;
870 u_int32_t *tl;
871 int error = 0, i, wccflag = NFSV3_WCCRATTR;
872 struct mbuf *mreq, *mrep, *md, *mb;
873 int v3 = NFS_ISV3(vp);
874
875 nfsstats.rpccnt[NFSPROC_SETATTR]++;
876 mreq = m_get2(NFSX_FH(v3) + NFSX_SATTR(v3), M_WAITOK, MT_DATA, 0);
877 mb = mreq;
878 bpos = mtod(mb, caddr_t);
879 nfsm_fhtom(vp, v3);
880 if (v3) {
881 nfsm_v3attrbuild(vap, TRUE);
882 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
883 *tl = nfs_false;
884 } else {
885 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
886 if (vap->va_mode == (mode_t)VNOVAL)
887 sp->sa_mode = nfs_xdrneg1;
888 else
889 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode);
890 if (vap->va_uid == (uid_t)VNOVAL)
891 sp->sa_uid = nfs_xdrneg1;
892 else
893 sp->sa_uid = txdr_unsigned(vap->va_uid);
894 if (vap->va_gid == (gid_t)VNOVAL)
895 sp->sa_gid = nfs_xdrneg1;
896 else
897 sp->sa_gid = txdr_unsigned(vap->va_gid);
898 sp->sa_size = txdr_unsigned(vap->va_size);
899 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
900 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
901 }
902 nfsm_request(vp, NFSPROC_SETATTR, curthread, cred);
903 if (v3) {
904 mtx_lock(&np->n_mtx);
905 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
906 np->n_accesscache[i].stamp = 0;
907 mtx_unlock(&np->n_mtx);
908 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
909 nfsm_wcc_data(vp, wccflag);
910 } else
911 nfsm_loadattr(vp, NULL);
912 m_freem(mrep);
913 nfsmout:
914 return (error);
915 }
916
917 /*
918 * nfs lookup call, one step at a time...
919 * First look in cache
920 * If not found, unlock the directory nfsnode and do the rpc
921 */
922 static int
nfs_lookup(struct vop_lookup_args * ap)923 nfs_lookup(struct vop_lookup_args *ap)
924 {
925 struct componentname *cnp = ap->a_cnp;
926 struct vnode *dvp = ap->a_dvp;
927 struct vnode **vpp = ap->a_vpp;
928 struct mount *mp = dvp->v_mount;
929 struct vattr dvattr, vattr;
930 struct timespec nctime;
931 int flags = cnp->cn_flags;
932 struct vnode *newvp;
933 struct nfsmount *nmp;
934 caddr_t bpos, dpos;
935 struct mbuf *mreq, *mrep, *md, *mb;
936 long len;
937 nfsfh_t *fhp;
938 struct nfsnode *np, *newnp;
939 int error = 0, attrflag, dattrflag, fhsize, ltype, ncticks;
940 int v3 = NFS_ISV3(dvp);
941 struct thread *td = cnp->cn_thread;
942
943 *vpp = NULLVP;
944 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
945 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
946 return (EROFS);
947 if (dvp->v_type != VDIR)
948 return (ENOTDIR);
949 nmp = VFSTONFS(mp);
950 np = VTONFS(dvp);
951 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) {
952 *vpp = NULLVP;
953 return (error);
954 }
955 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks);
956 if (error > 0 && error != ENOENT)
957 return (error);
958 if (error == -1) {
959 /*
960 * Lookups of "." are special and always return the
961 * current directory. cache_lookup() already handles
962 * associated locking bookkeeping, etc.
963 */
964 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
965 /* XXX: Is this really correct? */
966 if (cnp->cn_nameiop != LOOKUP &&
967 (flags & ISLASTCN))
968 cnp->cn_flags |= SAVENAME;
969 return (0);
970 }
971
972 /*
973 * We only accept a positive hit in the cache if the
974 * change time of the file matches our cached copy.
975 * Otherwise, we discard the cache entry and fallback
976 * to doing a lookup RPC. We also only trust cache
977 * entries for less than nm_nametimeo seconds.
978 *
979 * To better handle stale file handles and attributes,
980 * clear the attribute cache of this node if it is a
981 * leaf component, part of an open() call, and not
982 * locally modified before fetching the attributes.
983 * This should allow stale file handles to be detected
984 * here where we can fall back to a LOOKUP RPC to
985 * recover rather than having nfs_open() detect the
986 * stale file handle and failing open(2) with ESTALE.
987 */
988 newvp = *vpp;
989 newnp = VTONFS(newvp);
990 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
991 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
992 !(newnp->n_flag & NMODIFIED)) {
993 mtx_lock(&newnp->n_mtx);
994 newnp->n_attrstamp = 0;
995 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
996 mtx_unlock(&newnp->n_mtx);
997 }
998 if ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
999 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
1000 timespeccmp(&vattr.va_ctime, &nctime, ==)) {
1001 nfsstats.lookupcache_hits++;
1002 if (cnp->cn_nameiop != LOOKUP &&
1003 (flags & ISLASTCN))
1004 cnp->cn_flags |= SAVENAME;
1005 return (0);
1006 }
1007 cache_purge(newvp);
1008 if (dvp != newvp)
1009 vput(newvp);
1010 else
1011 vrele(newvp);
1012 *vpp = NULLVP;
1013 } else if (error == ENOENT) {
1014 if (dvp->v_iflag & VI_DOOMED)
1015 return (ENOENT);
1016 /*
1017 * We only accept a negative hit in the cache if the
1018 * modification time of the parent directory matches
1019 * the cached copy in the name cache entry.
1020 * Otherwise, we discard all of the negative cache
1021 * entries for this directory. We also only trust
1022 * negative cache entries for up to nm_negnametimeo
1023 * seconds.
1024 */
1025 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
1026 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
1027 timespeccmp(&vattr.va_mtime, &nctime, ==)) {
1028 nfsstats.lookupcache_hits++;
1029 return (ENOENT);
1030 }
1031 cache_purge_negative(dvp);
1032 }
1033
1034 attrflag = dattrflag = 0;
1035 error = 0;
1036 newvp = NULLVP;
1037 nfsstats.lookupcache_misses++;
1038 nfsstats.rpccnt[NFSPROC_LOOKUP]++;
1039 len = cnp->cn_namelen;
1040 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len), M_WAITOK,
1041 MT_DATA, 0);
1042 mb = mreq;
1043 bpos = mtod(mb, caddr_t);
1044 nfsm_fhtom(dvp, v3);
1045 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
1046 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_thread, cnp->cn_cred);
1047 if (error) {
1048 if (v3) {
1049 nfsm_postop_attr_va(dvp, dattrflag, &vattr);
1050 m_freem(mrep);
1051 }
1052 goto nfsmout;
1053 }
1054 nfsm_getfh(fhp, fhsize, v3);
1055
1056 /*
1057 * Handle RENAME case...
1058 */
1059 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
1060 if (NFS_CMPFH(np, fhp, fhsize)) {
1061 m_freem(mrep);
1062 return (EISDIR);
1063 }
1064 error = nfs_nget(mp, fhp, fhsize, &np, LK_EXCLUSIVE);
1065 if (error) {
1066 m_freem(mrep);
1067 return (error);
1068 }
1069 newvp = NFSTOV(np);
1070 if (v3) {
1071 nfsm_postop_attr(newvp, attrflag);
1072 nfsm_postop_attr(dvp, attrflag);
1073 } else
1074 nfsm_loadattr(newvp, NULL);
1075 *vpp = newvp;
1076 m_freem(mrep);
1077 cnp->cn_flags |= SAVENAME;
1078 return (0);
1079 }
1080
1081 if (flags & ISDOTDOT) {
1082 ltype = VOP_ISLOCKED(dvp);
1083 error = vfs_busy(mp, MBF_NOWAIT);
1084 if (error != 0) {
1085 vfs_ref(mp);
1086 VOP_UNLOCK(dvp, 0);
1087 error = vfs_busy(mp, 0);
1088 vn_lock(dvp, ltype | LK_RETRY);
1089 vfs_rel(mp);
1090 if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
1091 vfs_unbusy(mp);
1092 error = ENOENT;
1093 }
1094 if (error != 0) {
1095 m_freem(mrep);
1096 return (error);
1097 }
1098 }
1099 VOP_UNLOCK(dvp, 0);
1100 error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags);
1101 if (error == 0)
1102 newvp = NFSTOV(np);
1103 vfs_unbusy(mp);
1104 if (newvp != dvp)
1105 vn_lock(dvp, ltype | LK_RETRY);
1106 if (dvp->v_iflag & VI_DOOMED) {
1107 if (error == 0) {
1108 if (newvp == dvp)
1109 vrele(newvp);
1110 else
1111 vput(newvp);
1112 }
1113 error = ENOENT;
1114 }
1115 if (error) {
1116 m_freem(mrep);
1117 return (error);
1118 }
1119 } else if (NFS_CMPFH(np, fhp, fhsize)) {
1120 VREF(dvp);
1121 newvp = dvp;
1122 } else {
1123 error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags);
1124 if (error) {
1125 m_freem(mrep);
1126 return (error);
1127 }
1128 newvp = NFSTOV(np);
1129
1130 /*
1131 * Flush the attribute cache when opening a leaf node
1132 * to ensure that fresh attributes are fetched in
1133 * nfs_open() if we are unable to fetch attributes
1134 * from the LOOKUP reply.
1135 */
1136 if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1137 !(np->n_flag & NMODIFIED)) {
1138 mtx_lock(&np->n_mtx);
1139 np->n_attrstamp = 0;
1140 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1141 mtx_unlock(&np->n_mtx);
1142 }
1143 }
1144 if (v3) {
1145 nfsm_postop_attr_va(newvp, attrflag, &vattr);
1146 nfsm_postop_attr_va(dvp, dattrflag, &dvattr);
1147 } else {
1148 nfsm_loadattr(newvp, &vattr);
1149 attrflag = 1;
1150 }
1151 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
1152 cnp->cn_flags |= SAVENAME;
1153 if ((cnp->cn_flags & MAKEENTRY) &&
1154 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
1155 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
1156 cache_enter_time(dvp, newvp, cnp, &vattr.va_ctime,
1157 newvp->v_type != VDIR ? NULL : &dvattr.va_ctime);
1158 *vpp = newvp;
1159 m_freem(mrep);
1160 nfsmout:
1161 if (error) {
1162 if (newvp != NULLVP) {
1163 vput(newvp);
1164 *vpp = NULLVP;
1165 }
1166
1167 if (error != ENOENT)
1168 goto done;
1169
1170 /* The requested file was not found. */
1171 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
1172 (flags & ISLASTCN)) {
1173 /*
1174 * XXX: UFS does a full VOP_ACCESS(dvp,
1175 * VWRITE) here instead of just checking
1176 * MNT_RDONLY.
1177 */
1178 if (mp->mnt_flag & MNT_RDONLY)
1179 return (EROFS);
1180 cnp->cn_flags |= SAVENAME;
1181 return (EJUSTRETURN);
1182 }
1183
1184 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) {
1185 /*
1186 * Cache the modification time of the parent
1187 * directory from the post-op attributes in
1188 * the name cache entry. The negative cache
1189 * entry will be ignored once the directory
1190 * has changed. Don't bother adding the entry
1191 * if the directory has already changed.
1192 */
1193 mtx_lock(&np->n_mtx);
1194 if (timespeccmp(&np->n_vattr.va_mtime,
1195 &vattr.va_mtime, ==)) {
1196 mtx_unlock(&np->n_mtx);
1197 cache_enter_time(dvp, NULL, cnp,
1198 &vattr.va_mtime, NULL);
1199 } else
1200 mtx_unlock(&np->n_mtx);
1201 }
1202 return (ENOENT);
1203 }
1204 done:
1205 return (error);
1206 }
1207
1208 /*
1209 * nfs read call.
1210 * Just call nfs_bioread() to do the work.
1211 */
1212 static int
nfs_read(struct vop_read_args * ap)1213 nfs_read(struct vop_read_args *ap)
1214 {
1215 struct vnode *vp = ap->a_vp;
1216
1217 switch (vp->v_type) {
1218 case VREG:
1219 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
1220 case VDIR:
1221 return (EISDIR);
1222 default:
1223 return (EOPNOTSUPP);
1224 }
1225 }
1226
1227 /*
1228 * nfs readlink call
1229 */
1230 static int
nfs_readlink(struct vop_readlink_args * ap)1231 nfs_readlink(struct vop_readlink_args *ap)
1232 {
1233 struct vnode *vp = ap->a_vp;
1234
1235 if (vp->v_type != VLNK)
1236 return (EINVAL);
1237 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred));
1238 }
1239
1240 /*
1241 * Do a readlink rpc.
1242 * Called by nfs_doio() from below the buffer cache.
1243 */
1244 int
nfs_readlinkrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred)1245 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1246 {
1247 caddr_t bpos, dpos;
1248 int error = 0, len, attrflag;
1249 struct mbuf *mreq, *mrep, *md, *mb;
1250 int v3 = NFS_ISV3(vp);
1251
1252 nfsstats.rpccnt[NFSPROC_READLINK]++;
1253 mreq = m_get2(NFSX_FH(v3), M_WAITOK, MT_DATA, 0);
1254 mb = mreq;
1255 bpos = mtod(mb, caddr_t);
1256 nfsm_fhtom(vp, v3);
1257 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred);
1258 if (v3)
1259 nfsm_postop_attr(vp, attrflag);
1260 if (!error) {
1261 nfsm_strsiz(len, NFS_MAXPATHLEN);
1262 if (len == NFS_MAXPATHLEN) {
1263 struct nfsnode *np = VTONFS(vp);
1264 mtx_lock(&np->n_mtx);
1265 if (np->n_size && np->n_size < NFS_MAXPATHLEN)
1266 len = np->n_size;
1267 mtx_unlock(&np->n_mtx);
1268 }
1269 nfsm_mtouio(uiop, len);
1270 }
1271 m_freem(mrep);
1272 nfsmout:
1273 return (error);
1274 }
1275
1276 /*
1277 * nfs read rpc call
1278 * Ditto above
1279 */
1280 int
nfs_readrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred)1281 nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1282 {
1283 u_int32_t *tl;
1284 caddr_t bpos, dpos;
1285 struct mbuf *mreq, *mrep, *md, *mb;
1286 struct nfsmount *nmp;
1287 off_t end;
1288 int error = 0, len, retlen, tsiz, eof, attrflag;
1289 int v3 = NFS_ISV3(vp);
1290 int rsize;
1291
1292 #ifndef nolint
1293 eof = 0;
1294 #endif
1295 nmp = VFSTONFS(vp->v_mount);
1296 tsiz = uiop->uio_resid;
1297 mtx_lock(&nmp->nm_mtx);
1298 end = uiop->uio_offset + tsiz;
1299 if (end > nmp->nm_maxfilesize || end < uiop->uio_offset) {
1300 mtx_unlock(&nmp->nm_mtx);
1301 return (EFBIG);
1302 }
1303 rsize = nmp->nm_rsize;
1304 mtx_unlock(&nmp->nm_mtx);
1305 while (tsiz > 0) {
1306 nfsstats.rpccnt[NFSPROC_READ]++;
1307 len = (tsiz > rsize) ? rsize : tsiz;
1308 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED * 3, M_WAITOK,
1309 MT_DATA, 0);
1310 mb = mreq;
1311 bpos = mtod(mb, caddr_t);
1312 nfsm_fhtom(vp, v3);
1313 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED * 3);
1314 if (v3) {
1315 txdr_hyper(uiop->uio_offset, tl);
1316 *(tl + 2) = txdr_unsigned(len);
1317 } else {
1318 *tl++ = txdr_unsigned(uiop->uio_offset);
1319 *tl++ = txdr_unsigned(len);
1320 *tl = 0;
1321 }
1322 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, cred);
1323 if (v3) {
1324 nfsm_postop_attr(vp, attrflag);
1325 if (error) {
1326 m_freem(mrep);
1327 goto nfsmout;
1328 }
1329 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED);
1330 eof = fxdr_unsigned(int, *(tl + 1));
1331 } else {
1332 nfsm_loadattr(vp, NULL);
1333 }
1334 nfsm_strsiz(retlen, rsize);
1335 nfsm_mtouio(uiop, retlen);
1336 m_freem(mrep);
1337 tsiz -= retlen;
1338 if (v3) {
1339 if (eof || retlen == 0) {
1340 tsiz = 0;
1341 }
1342 } else if (retlen < len) {
1343 tsiz = 0;
1344 }
1345 }
1346 nfsmout:
1347 return (error);
1348 }
1349
1350 /*
1351 * nfs write call
1352 */
1353 int
nfs_writerpc(struct vnode * vp,struct uio * uiop,struct ucred * cred,int * iomode,int * must_commit)1354 nfs_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
1355 int *iomode, int *must_commit)
1356 {
1357 u_int32_t *tl;
1358 int32_t backup;
1359 caddr_t bpos, dpos;
1360 struct mbuf *mreq, *mrep, *md, *mb;
1361 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
1362 off_t end;
1363 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit;
1364 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC;
1365 int wsize;
1366
1367 KASSERT(uiop->uio_iovcnt == 1, ("nfs: writerpc iovcnt > 1"));
1368 *must_commit = 0;
1369 tsiz = uiop->uio_resid;
1370 mtx_lock(&nmp->nm_mtx);
1371 end = uiop->uio_offset + tsiz;
1372 if (end > nmp->nm_maxfilesize || end < uiop->uio_offset) {
1373 mtx_unlock(&nmp->nm_mtx);
1374 return (EFBIG);
1375 }
1376 wsize = nmp->nm_wsize;
1377 mtx_unlock(&nmp->nm_mtx);
1378 while (tsiz > 0) {
1379 nfsstats.rpccnt[NFSPROC_WRITE]++;
1380 len = (tsiz > wsize) ? wsize : tsiz;
1381 mreq = m_get2(NFSX_FH(v3) + 5 * NFSX_UNSIGNED, M_WAITOK,
1382 MT_DATA, 0);
1383 mb = mreq;
1384 bpos = mtod(mb, caddr_t);
1385 nfsm_fhtom(vp, v3);
1386 if (v3) {
1387 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED);
1388 txdr_hyper(uiop->uio_offset, tl);
1389 tl += 2;
1390 *tl++ = txdr_unsigned(len);
1391 *tl++ = txdr_unsigned(*iomode);
1392 *tl = txdr_unsigned(len);
1393 } else {
1394 u_int32_t x;
1395
1396 tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED);
1397 /* Set both "begin" and "current" to non-garbage. */
1398 x = txdr_unsigned((u_int32_t)uiop->uio_offset);
1399 *tl++ = x; /* "begin offset" */
1400 *tl++ = x; /* "current offset" */
1401 x = txdr_unsigned(len);
1402 *tl++ = x; /* total to this offset */
1403 *tl = x; /* size of this write */
1404 }
1405 nfsm_uiotom(uiop, len);
1406 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, cred);
1407 if (v3) {
1408 wccflag = NFSV3_WCCCHK;
1409 nfsm_wcc_data(vp, wccflag);
1410 if (!error) {
1411 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED
1412 + NFSX_V3WRITEVERF);
1413 rlen = fxdr_unsigned(int, *tl++);
1414 if (rlen == 0) {
1415 error = NFSERR_IO;
1416 m_freem(mrep);
1417 break;
1418 } else if (rlen < len) {
1419 backup = len - rlen;
1420 uiop->uio_iov->iov_base =
1421 (char *)uiop->uio_iov->iov_base -
1422 backup;
1423 uiop->uio_iov->iov_len += backup;
1424 uiop->uio_offset -= backup;
1425 uiop->uio_resid += backup;
1426 len = rlen;
1427 }
1428 commit = fxdr_unsigned(int, *tl++);
1429
1430 /*
1431 * Return the lowest committment level
1432 * obtained by any of the RPCs.
1433 */
1434 if (committed == NFSV3WRITE_FILESYNC)
1435 committed = commit;
1436 else if (committed == NFSV3WRITE_DATASYNC &&
1437 commit == NFSV3WRITE_UNSTABLE)
1438 committed = commit;
1439 mtx_lock(&nmp->nm_mtx);
1440 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){
1441 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
1442 NFSX_V3WRITEVERF);
1443 nmp->nm_state |= NFSSTA_HASWRITEVERF;
1444 } else if (bcmp((caddr_t)tl,
1445 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) {
1446 *must_commit = 1;
1447 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
1448 NFSX_V3WRITEVERF);
1449 }
1450 mtx_unlock(&nmp->nm_mtx);
1451 }
1452 } else {
1453 nfsm_loadattr(vp, NULL);
1454 }
1455 if (wccflag) {
1456 mtx_lock(&(VTONFS(vp))->n_mtx);
1457 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime;
1458 mtx_unlock(&(VTONFS(vp))->n_mtx);
1459 }
1460 m_freem(mrep);
1461 if (error)
1462 break;
1463 tsiz -= len;
1464 }
1465 nfsmout:
1466 if (DOINGASYNC(vp))
1467 committed = NFSV3WRITE_FILESYNC;
1468 *iomode = committed;
1469 if (error)
1470 uiop->uio_resid = tsiz;
1471 return (error);
1472 }
1473
1474 /*
1475 * nfs mknod rpc
1476 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
1477 * mode set to specify the file type and the size field for rdev.
1478 */
1479 static int
nfs_mknodrpc(struct vnode * dvp,struct vnode ** vpp,struct componentname * cnp,struct vattr * vap)1480 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
1481 struct vattr *vap)
1482 {
1483 struct nfsv2_sattr *sp;
1484 u_int32_t *tl;
1485 struct vnode *newvp = NULL;
1486 struct nfsnode *np = NULL;
1487 struct vattr vattr;
1488 caddr_t bpos, dpos;
1489 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0;
1490 struct mbuf *mreq, *mrep, *md, *mb;
1491 u_int32_t rdev;
1492 int v3 = NFS_ISV3(dvp);
1493
1494 if (vap->va_type == VCHR || vap->va_type == VBLK)
1495 rdev = txdr_unsigned(vap->va_rdev);
1496 else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
1497 rdev = nfs_xdrneg1;
1498 else {
1499 return (EOPNOTSUPP);
1500 }
1501 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
1502 return (error);
1503 nfsstats.rpccnt[NFSPROC_MKNOD]++;
1504 mreq = m_get2(NFSX_FH(v3) + 4 * NFSX_UNSIGNED +
1505 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3), M_WAITOK, MT_DATA, 0);
1506 mb = mreq;
1507 bpos = mtod(mb, caddr_t);
1508 nfsm_fhtom(dvp, v3);
1509 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
1510 if (v3) {
1511 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
1512 *tl++ = vtonfsv3_type(vap->va_type);
1513 nfsm_v3attrbuild(vap, FALSE);
1514 if (vap->va_type == VCHR || vap->va_type == VBLK) {
1515 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
1516 *tl++ = txdr_unsigned(major(vap->va_rdev));
1517 *tl = txdr_unsigned(minor(vap->va_rdev));
1518 }
1519 } else {
1520 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
1521 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
1522 sp->sa_uid = nfs_xdrneg1;
1523 sp->sa_gid = nfs_xdrneg1;
1524 sp->sa_size = rdev;
1525 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
1526 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
1527 }
1528 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_thread, cnp->cn_cred);
1529 if (!error) {
1530 nfsm_mtofh(dvp, newvp, v3, gotvp);
1531 if (!gotvp) {
1532 if (newvp) {
1533 vput(newvp);
1534 newvp = NULL;
1535 }
1536 error = nfs_lookitup(dvp, cnp->cn_nameptr,
1537 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np);
1538 if (!error)
1539 newvp = NFSTOV(np);
1540 }
1541 }
1542 if (v3)
1543 nfsm_wcc_data(dvp, wccflag);
1544 m_freem(mrep);
1545 nfsmout:
1546 if (error) {
1547 if (newvp)
1548 vput(newvp);
1549 } else {
1550 *vpp = newvp;
1551 }
1552 mtx_lock(&(VTONFS(dvp))->n_mtx);
1553 VTONFS(dvp)->n_flag |= NMODIFIED;
1554 if (!wccflag) {
1555 VTONFS(dvp)->n_attrstamp = 0;
1556 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1557 }
1558 mtx_unlock(&(VTONFS(dvp))->n_mtx);
1559 return (error);
1560 }
1561
1562 /*
1563 * nfs mknod vop
1564 * just call nfs_mknodrpc() to do the work.
1565 */
1566 /* ARGSUSED */
1567 static int
nfs_mknod(struct vop_mknod_args * ap)1568 nfs_mknod(struct vop_mknod_args *ap)
1569 {
1570 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
1571 }
1572
1573 static u_long create_verf;
1574 /*
1575 * nfs file create call
1576 */
1577 static int
nfs_create(struct vop_create_args * ap)1578 nfs_create(struct vop_create_args *ap)
1579 {
1580 struct vnode *dvp = ap->a_dvp;
1581 struct vattr *vap = ap->a_vap;
1582 struct componentname *cnp = ap->a_cnp;
1583 struct nfsv2_sattr *sp;
1584 u_int32_t *tl;
1585 struct nfsnode *np = NULL;
1586 struct vnode *newvp = NULL;
1587 caddr_t bpos, dpos;
1588 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0;
1589 struct mbuf *mreq, *mrep, *md, *mb;
1590 struct vattr vattr;
1591 int v3 = NFS_ISV3(dvp);
1592
1593 /*
1594 * Oops, not for me..
1595 */
1596 if (vap->va_type == VSOCK) {
1597 error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap);
1598 return (error);
1599 }
1600
1601 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) {
1602 return (error);
1603 }
1604 if (vap->va_vaflags & VA_EXCLUSIVE)
1605 fmode |= O_EXCL;
1606 again:
1607 nfsstats.rpccnt[NFSPROC_CREATE]++;
1608 mreq = m_get2(NFSX_FH(v3) + 2 * NFSX_UNSIGNED +
1609 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3), M_WAITOK, MT_DATA, 0);
1610 mb = mreq;
1611 bpos = mtod(mb, caddr_t);
1612 nfsm_fhtom(dvp, v3);
1613 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
1614 if (v3) {
1615 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
1616 if (fmode & O_EXCL) {
1617 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE);
1618 tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF);
1619 #ifdef INET
1620 CURVNET_SET(CRED_TO_VNET(cnp->cn_cred));
1621 IN_IFADDR_RLOCK();
1622 if (!TAILQ_EMPTY(&V_in_ifaddrhead))
1623 *tl++ = IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr.s_addr;
1624 else
1625 #endif
1626 *tl++ = create_verf;
1627 #ifdef INET
1628 IN_IFADDR_RUNLOCK();
1629 CURVNET_RESTORE();
1630 #endif
1631 *tl = ++create_verf;
1632 } else {
1633 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED);
1634 nfsm_v3attrbuild(vap, FALSE);
1635 }
1636 } else {
1637 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
1638 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
1639 sp->sa_uid = nfs_xdrneg1;
1640 sp->sa_gid = nfs_xdrneg1;
1641 sp->sa_size = 0;
1642 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
1643 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
1644 }
1645 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_thread, cnp->cn_cred);
1646 if (!error) {
1647 nfsm_mtofh(dvp, newvp, v3, gotvp);
1648 if (!gotvp) {
1649 if (newvp) {
1650 vput(newvp);
1651 newvp = NULL;
1652 }
1653 error = nfs_lookitup(dvp, cnp->cn_nameptr,
1654 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np);
1655 if (!error)
1656 newvp = NFSTOV(np);
1657 }
1658 }
1659 if (v3)
1660 nfsm_wcc_data(dvp, wccflag);
1661 m_freem(mrep);
1662 nfsmout:
1663 if (error) {
1664 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) {
1665 fmode &= ~O_EXCL;
1666 goto again;
1667 }
1668 if (newvp)
1669 vput(newvp);
1670 } else if (v3 && (fmode & O_EXCL)) {
1671 /*
1672 * We are normally called with only a partially initialized
1673 * VAP. Since the NFSv3 spec says that server may use the
1674 * file attributes to store the verifier, the spec requires
1675 * us to do a SETATTR RPC. FreeBSD servers store the verifier
1676 * in atime, but we can't really assume that all servers will
1677 * so we ensure that our SETATTR sets both atime and mtime.
1678 */
1679 if (vap->va_mtime.tv_sec == VNOVAL)
1680 vfs_timestamp(&vap->va_mtime);
1681 if (vap->va_atime.tv_sec == VNOVAL)
1682 vap->va_atime = vap->va_mtime;
1683 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred);
1684 if (error)
1685 vput(newvp);
1686 }
1687 if (!error) {
1688 *ap->a_vpp = newvp;
1689 }
1690 mtx_lock(&(VTONFS(dvp))->n_mtx);
1691 VTONFS(dvp)->n_flag |= NMODIFIED;
1692 if (!wccflag) {
1693 VTONFS(dvp)->n_attrstamp = 0;
1694 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1695 }
1696 mtx_unlock(&(VTONFS(dvp))->n_mtx);
1697 return (error);
1698 }
1699
1700 /*
1701 * nfs file remove call
1702 * To try and make nfs semantics closer to ufs semantics, a file that has
1703 * other processes using the vnode is renamed instead of removed and then
1704 * removed later on the last close.
1705 * - If v_usecount > 1
1706 * If a rename is not already in the works
1707 * call nfs_sillyrename() to set it up
1708 * else
1709 * do the remove rpc
1710 */
1711 static int
nfs_remove(struct vop_remove_args * ap)1712 nfs_remove(struct vop_remove_args *ap)
1713 {
1714 struct vnode *vp = ap->a_vp;
1715 struct vnode *dvp = ap->a_dvp;
1716 struct componentname *cnp = ap->a_cnp;
1717 struct nfsnode *np = VTONFS(vp);
1718 int error = 0;
1719 struct vattr vattr;
1720
1721 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
1722 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
1723 if (vp->v_type == VDIR)
1724 error = EPERM;
1725 else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
1726 !VOP_GETATTR(vp, &vattr, cnp->cn_cred) && vattr.va_nlink > 1)) {
1727 /*
1728 * Purge the name cache so that the chance of a lookup for
1729 * the name succeeding while the remove is in progress is
1730 * minimized. Without node locking it can still happen, such
1731 * that an I/O op returns ESTALE, but since you get this if
1732 * another host removes the file..
1733 */
1734 cache_purge(vp);
1735 /*
1736 * throw away biocache buffers, mainly to avoid
1737 * unnecessary delayed writes later.
1738 */
1739 error = nfs_vinvalbuf(vp, 0, cnp->cn_thread, 1);
1740 /* Do the rpc */
1741 if (error != EINTR && error != EIO)
1742 error = nfs_removerpc(dvp, cnp->cn_nameptr,
1743 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
1744 /*
1745 * Kludge City: If the first reply to the remove rpc is lost..
1746 * the reply to the retransmitted request will be ENOENT
1747 * since the file was in fact removed
1748 * Therefore, we cheat and return success.
1749 */
1750 if (error == ENOENT)
1751 error = 0;
1752 } else if (!np->n_sillyrename)
1753 error = nfs_sillyrename(dvp, vp, cnp);
1754 mtx_lock(&np->n_mtx);
1755 np->n_attrstamp = 0;
1756 mtx_unlock(&np->n_mtx);
1757 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1758 return (error);
1759 }
1760
1761 /*
1762 * nfs file remove rpc called from nfs_inactive
1763 */
1764 int
nfs_removeit(struct sillyrename * sp)1765 nfs_removeit(struct sillyrename *sp)
1766 {
1767 /*
1768 * Make sure that the directory vnode is still valid.
1769 * XXX we should lock sp->s_dvp here.
1770 */
1771 if (sp->s_dvp->v_type == VBAD)
1772 return (0);
1773 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred,
1774 NULL));
1775 }
1776
1777 /*
1778 * Nfs remove rpc, called from nfs_remove() and nfs_removeit().
1779 */
1780 static int
nfs_removerpc(struct vnode * dvp,const char * name,int namelen,struct ucred * cred,struct thread * td)1781 nfs_removerpc(struct vnode *dvp, const char *name, int namelen,
1782 struct ucred *cred, struct thread *td)
1783 {
1784 caddr_t bpos, dpos;
1785 int error = 0, wccflag = NFSV3_WCCRATTR;
1786 struct mbuf *mreq, *mrep, *md, *mb;
1787 int v3 = NFS_ISV3(dvp);
1788
1789 nfsstats.rpccnt[NFSPROC_REMOVE]++;
1790 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen),
1791 M_WAITOK, MT_DATA, 0);
1792 mb = mreq;
1793 bpos = mtod(mb, caddr_t);
1794 nfsm_fhtom(dvp, v3);
1795 nfsm_strtom(name, namelen, NFS_MAXNAMLEN);
1796 nfsm_request(dvp, NFSPROC_REMOVE, td, cred);
1797 if (v3)
1798 nfsm_wcc_data(dvp, wccflag);
1799 m_freem(mrep);
1800 nfsmout:
1801 mtx_lock(&(VTONFS(dvp))->n_mtx);
1802 VTONFS(dvp)->n_flag |= NMODIFIED;
1803 if (!wccflag) {
1804 VTONFS(dvp)->n_attrstamp = 0;
1805 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1806 }
1807 mtx_unlock(&(VTONFS(dvp))->n_mtx);
1808 return (error);
1809 }
1810
1811 /*
1812 * nfs file rename call
1813 */
1814 static int
nfs_rename(struct vop_rename_args * ap)1815 nfs_rename(struct vop_rename_args *ap)
1816 {
1817 struct vnode *fvp = ap->a_fvp;
1818 struct vnode *tvp = ap->a_tvp;
1819 struct vnode *fdvp = ap->a_fdvp;
1820 struct vnode *tdvp = ap->a_tdvp;
1821 struct componentname *tcnp = ap->a_tcnp;
1822 struct componentname *fcnp = ap->a_fcnp;
1823 int error;
1824
1825 KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
1826 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
1827 /* Check for cross-device rename */
1828 if ((fvp->v_mount != tdvp->v_mount) ||
1829 (tvp && (fvp->v_mount != tvp->v_mount))) {
1830 error = EXDEV;
1831 goto out;
1832 }
1833
1834 if (fvp == tvp) {
1835 nfs_printf("nfs_rename: fvp == tvp (can't happen)\n");
1836 error = 0;
1837 goto out;
1838 }
1839 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
1840 goto out;
1841
1842 /*
1843 * We have to flush B_DELWRI data prior to renaming
1844 * the file. If we don't, the delayed-write buffers
1845 * can be flushed out later after the file has gone stale
1846 * under NFSV3. NFSV2 does not have this problem because
1847 * ( as far as I can tell ) it flushes dirty buffers more
1848 * often.
1849 *
1850 * Skip the rename operation if the fsync fails, this can happen
1851 * due to the server's volume being full, when we pushed out data
1852 * that was written back to our cache earlier. Not checking for
1853 * this condition can result in potential (silent) data loss.
1854 */
1855 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
1856 VOP_UNLOCK(fvp, 0);
1857 if (!error && tvp)
1858 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
1859 if (error)
1860 goto out;
1861
1862 /*
1863 * If the tvp exists and is in use, sillyrename it before doing the
1864 * rename of the new file over it.
1865 * XXX Can't sillyrename a directory.
1866 */
1867 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
1868 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
1869 vput(tvp);
1870 tvp = NULL;
1871 }
1872
1873 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen,
1874 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
1875 tcnp->cn_thread);
1876
1877 if (fvp->v_type == VDIR) {
1878 if (tvp != NULL && tvp->v_type == VDIR)
1879 cache_purge(tdvp);
1880 cache_purge(fdvp);
1881 }
1882
1883 out:
1884 if (tdvp == tvp)
1885 vrele(tdvp);
1886 else
1887 vput(tdvp);
1888 if (tvp)
1889 vput(tvp);
1890 vrele(fdvp);
1891 vrele(fvp);
1892 /*
1893 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
1894 */
1895 if (error == ENOENT)
1896 error = 0;
1897 return (error);
1898 }
1899
1900 /*
1901 * nfs file rename rpc called from nfs_remove() above
1902 */
1903 static int
nfs_renameit(struct vnode * sdvp,struct componentname * scnp,struct sillyrename * sp)1904 nfs_renameit(struct vnode *sdvp, struct componentname *scnp,
1905 struct sillyrename *sp)
1906 {
1907
1908 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp,
1909 sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread));
1910 }
1911
1912 /*
1913 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
1914 */
1915 static int
nfs_renamerpc(struct vnode * fdvp,const char * fnameptr,int fnamelen,struct vnode * tdvp,const char * tnameptr,int tnamelen,struct ucred * cred,struct thread * td)1916 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen,
1917 struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred,
1918 struct thread *td)
1919 {
1920 caddr_t bpos, dpos;
1921 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR;
1922 struct mbuf *mreq, *mrep, *md, *mb;
1923 int v3 = NFS_ISV3(fdvp);
1924
1925 nfsstats.rpccnt[NFSPROC_RENAME]++;
1926 mreq = m_get2((NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) +
1927 nfsm_rndup(tnamelen), M_WAITOK, MT_DATA, 0);
1928 mb = mreq;
1929 bpos = mtod(mb, caddr_t);
1930 nfsm_fhtom(fdvp, v3);
1931 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN);
1932 nfsm_fhtom(tdvp, v3);
1933 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN);
1934 nfsm_request(fdvp, NFSPROC_RENAME, td, cred);
1935 if (v3) {
1936 nfsm_wcc_data(fdvp, fwccflag);
1937 nfsm_wcc_data(tdvp, twccflag);
1938 }
1939 m_freem(mrep);
1940 nfsmout:
1941 mtx_lock(&(VTONFS(fdvp))->n_mtx);
1942 VTONFS(fdvp)->n_flag |= NMODIFIED;
1943 mtx_unlock(&(VTONFS(fdvp))->n_mtx);
1944 mtx_lock(&(VTONFS(tdvp))->n_mtx);
1945 VTONFS(tdvp)->n_flag |= NMODIFIED;
1946 mtx_unlock(&(VTONFS(tdvp))->n_mtx);
1947 if (!fwccflag) {
1948 VTONFS(fdvp)->n_attrstamp = 0;
1949 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
1950 }
1951 if (!twccflag) {
1952 VTONFS(tdvp)->n_attrstamp = 0;
1953 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
1954 }
1955 return (error);
1956 }
1957
1958 /*
1959 * nfs hard link create call
1960 */
1961 static int
nfs_link(struct vop_link_args * ap)1962 nfs_link(struct vop_link_args *ap)
1963 {
1964 struct vnode *vp = ap->a_vp;
1965 struct vnode *tdvp = ap->a_tdvp;
1966 struct componentname *cnp = ap->a_cnp;
1967 caddr_t bpos, dpos;
1968 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0;
1969 struct mbuf *mreq, *mrep, *md, *mb;
1970 int v3;
1971
1972 if (vp->v_mount != tdvp->v_mount) {
1973 return (EXDEV);
1974 }
1975
1976 /*
1977 * Push all writes to the server, so that the attribute cache
1978 * doesn't get "out of sync" with the server.
1979 * XXX There should be a better way!
1980 */
1981 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
1982
1983 v3 = NFS_ISV3(vp);
1984 nfsstats.rpccnt[NFSPROC_LINK]++;
1985 mreq = m_get2(NFSX_FH(v3)*2 + NFSX_UNSIGNED +
1986 nfsm_rndup(cnp->cn_namelen), M_WAITOK, MT_DATA, 0);
1987 mb = mreq;
1988 bpos = mtod(mb, caddr_t);
1989 nfsm_fhtom(vp, v3);
1990 nfsm_fhtom(tdvp, v3);
1991 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
1992 nfsm_request(vp, NFSPROC_LINK, cnp->cn_thread, cnp->cn_cred);
1993 if (v3) {
1994 nfsm_postop_attr(vp, attrflag);
1995 nfsm_wcc_data(tdvp, wccflag);
1996 }
1997 m_freem(mrep);
1998 nfsmout:
1999 mtx_lock(&(VTONFS(tdvp))->n_mtx);
2000 VTONFS(tdvp)->n_flag |= NMODIFIED;
2001 mtx_unlock(&(VTONFS(tdvp))->n_mtx);
2002 if (!attrflag) {
2003 VTONFS(vp)->n_attrstamp = 0;
2004 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
2005 }
2006 if (!wccflag) {
2007 VTONFS(tdvp)->n_attrstamp = 0;
2008 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
2009 }
2010 return (error);
2011 }
2012
2013 /*
2014 * nfs symbolic link create call
2015 */
2016 static int
nfs_symlink(struct vop_symlink_args * ap)2017 nfs_symlink(struct vop_symlink_args *ap)
2018 {
2019 struct vnode *dvp = ap->a_dvp;
2020 struct vattr *vap = ap->a_vap;
2021 struct componentname *cnp = ap->a_cnp;
2022 struct nfsv2_sattr *sp;
2023 caddr_t bpos, dpos;
2024 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp;
2025 struct mbuf *mreq, *mrep, *md, *mb;
2026 struct vnode *newvp = NULL;
2027 int v3 = NFS_ISV3(dvp);
2028
2029 nfsstats.rpccnt[NFSPROC_SYMLINK]++;
2030 slen = strlen(ap->a_target);
2031 mreq = m_get2(NFSX_FH(v3) + 2*NFSX_UNSIGNED +
2032 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3),
2033 M_WAITOK, MT_DATA, 0);
2034 mb = mreq;
2035 bpos = mtod(mb, caddr_t);
2036 nfsm_fhtom(dvp, v3);
2037 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
2038 if (v3) {
2039 nfsm_v3attrbuild(vap, FALSE);
2040 }
2041 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN);
2042 if (!v3) {
2043 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
2044 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode);
2045 sp->sa_uid = nfs_xdrneg1;
2046 sp->sa_gid = nfs_xdrneg1;
2047 sp->sa_size = nfs_xdrneg1;
2048 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
2049 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
2050 }
2051
2052 /*
2053 * Issue the NFS request and get the rpc response.
2054 *
2055 * Only NFSv3 responses returning an error of 0 actually return
2056 * a file handle that can be converted into newvp without having
2057 * to do an extra lookup rpc.
2058 */
2059 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_thread, cnp->cn_cred);
2060 if (v3) {
2061 if (error == 0)
2062 nfsm_mtofh(dvp, newvp, v3, gotvp);
2063 nfsm_wcc_data(dvp, wccflag);
2064 }
2065
2066 /*
2067 * out code jumps -> here, mrep is also freed.
2068 */
2069
2070 m_freem(mrep);
2071 nfsmout:
2072
2073 /*
2074 * If we do not have an error and we could not extract the newvp from
2075 * the response due to the request being NFSv2, we have to do a
2076 * lookup in order to obtain a newvp to return.
2077 */
2078 if (error == 0 && newvp == NULL) {
2079 struct nfsnode *np = NULL;
2080
2081 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2082 cnp->cn_cred, cnp->cn_thread, &np);
2083 if (!error)
2084 newvp = NFSTOV(np);
2085 }
2086 if (error) {
2087 if (newvp)
2088 vput(newvp);
2089 } else {
2090 *ap->a_vpp = newvp;
2091 }
2092 mtx_lock(&(VTONFS(dvp))->n_mtx);
2093 VTONFS(dvp)->n_flag |= NMODIFIED;
2094 mtx_unlock(&(VTONFS(dvp))->n_mtx);
2095 if (!wccflag) {
2096 VTONFS(dvp)->n_attrstamp = 0;
2097 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2098 }
2099 return (error);
2100 }
2101
2102 /*
2103 * nfs make dir call
2104 */
2105 static int
nfs_mkdir(struct vop_mkdir_args * ap)2106 nfs_mkdir(struct vop_mkdir_args *ap)
2107 {
2108 struct vnode *dvp = ap->a_dvp;
2109 struct vattr *vap = ap->a_vap;
2110 struct componentname *cnp = ap->a_cnp;
2111 struct nfsv2_sattr *sp;
2112 int len;
2113 struct nfsnode *np = NULL;
2114 struct vnode *newvp = NULL;
2115 caddr_t bpos, dpos;
2116 int error = 0, wccflag = NFSV3_WCCRATTR;
2117 int gotvp = 0;
2118 struct mbuf *mreq, *mrep, *md, *mb;
2119 struct vattr vattr;
2120 int v3 = NFS_ISV3(dvp);
2121
2122 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
2123 return (error);
2124 len = cnp->cn_namelen;
2125 nfsstats.rpccnt[NFSPROC_MKDIR]++;
2126 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) +
2127 NFSX_SATTR(v3), M_WAITOK, MT_DATA, 0);
2128 mb = mreq;
2129 bpos = mtod(mb, caddr_t);
2130 nfsm_fhtom(dvp, v3);
2131 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
2132 if (v3) {
2133 nfsm_v3attrbuild(vap, FALSE);
2134 } else {
2135 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
2136 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode);
2137 sp->sa_uid = nfs_xdrneg1;
2138 sp->sa_gid = nfs_xdrneg1;
2139 sp->sa_size = nfs_xdrneg1;
2140 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
2141 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
2142 }
2143 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_thread, cnp->cn_cred);
2144 if (!error)
2145 nfsm_mtofh(dvp, newvp, v3, gotvp);
2146 if (v3)
2147 nfsm_wcc_data(dvp, wccflag);
2148 m_freem(mrep);
2149 nfsmout:
2150 mtx_lock(&(VTONFS(dvp))->n_mtx);
2151 VTONFS(dvp)->n_flag |= NMODIFIED;
2152 mtx_unlock(&(VTONFS(dvp))->n_mtx);
2153 if (!wccflag) {
2154 VTONFS(dvp)->n_attrstamp = 0;
2155 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2156 }
2157 if (error == 0 && newvp == NULL) {
2158 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred,
2159 cnp->cn_thread, &np);
2160 if (!error) {
2161 newvp = NFSTOV(np);
2162 if (newvp->v_type != VDIR)
2163 error = EEXIST;
2164 }
2165 }
2166 if (error) {
2167 if (newvp)
2168 vput(newvp);
2169 } else
2170 *ap->a_vpp = newvp;
2171 return (error);
2172 }
2173
2174 /*
2175 * nfs remove directory call
2176 */
2177 static int
nfs_rmdir(struct vop_rmdir_args * ap)2178 nfs_rmdir(struct vop_rmdir_args *ap)
2179 {
2180 struct vnode *vp = ap->a_vp;
2181 struct vnode *dvp = ap->a_dvp;
2182 struct componentname *cnp = ap->a_cnp;
2183 caddr_t bpos, dpos;
2184 int error = 0, wccflag = NFSV3_WCCRATTR;
2185 struct mbuf *mreq, *mrep, *md, *mb;
2186 int v3 = NFS_ISV3(dvp);
2187
2188 if (dvp == vp)
2189 return (EINVAL);
2190 nfsstats.rpccnt[NFSPROC_RMDIR]++;
2191 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED +
2192 nfsm_rndup(cnp->cn_namelen), M_WAITOK, MT_DATA, 0);
2193 mb = mreq;
2194 bpos = mtod(mb, caddr_t);
2195 nfsm_fhtom(dvp, v3);
2196 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
2197 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred);
2198 if (v3)
2199 nfsm_wcc_data(dvp, wccflag);
2200 m_freem(mrep);
2201 nfsmout:
2202 mtx_lock(&(VTONFS(dvp))->n_mtx);
2203 VTONFS(dvp)->n_flag |= NMODIFIED;
2204 mtx_unlock(&(VTONFS(dvp))->n_mtx);
2205 if (!wccflag) {
2206 VTONFS(dvp)->n_attrstamp = 0;
2207 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2208 }
2209 cache_purge(dvp);
2210 cache_purge(vp);
2211 /*
2212 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
2213 */
2214 if (error == ENOENT)
2215 error = 0;
2216 return (error);
2217 }
2218
2219 /*
2220 * nfs readdir call
2221 */
2222 static int
nfs_readdir(struct vop_readdir_args * ap)2223 nfs_readdir(struct vop_readdir_args *ap)
2224 {
2225 struct vnode *vp = ap->a_vp;
2226 struct nfsnode *np = VTONFS(vp);
2227 struct uio *uio = ap->a_uio;
2228 int tresid, error = 0;
2229 struct vattr vattr;
2230
2231 if (vp->v_type != VDIR)
2232 return(EPERM);
2233
2234 /*
2235 * First, check for hit on the EOF offset cache
2236 */
2237 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
2238 (np->n_flag & NMODIFIED) == 0) {
2239 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
2240 mtx_lock(&np->n_mtx);
2241 if (!NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
2242 mtx_unlock(&np->n_mtx);
2243 nfsstats.direofcache_hits++;
2244 goto out;
2245 } else
2246 mtx_unlock(&np->n_mtx);
2247 }
2248 }
2249
2250 /*
2251 * Call nfs_bioread() to do the real work.
2252 */
2253 tresid = uio->uio_resid;
2254 error = nfs_bioread(vp, uio, 0, ap->a_cred);
2255
2256 if (!error && uio->uio_resid == tresid) {
2257 nfsstats.direofcache_misses++;
2258 }
2259 out:
2260 return (error);
2261 }
2262
2263 /*
2264 * Readdir rpc call.
2265 * Called from below the buffer cache by nfs_doio().
2266 */
2267 int
nfs_readdirrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred)2268 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
2269 {
2270 int len, left;
2271 struct dirent *dp = NULL;
2272 u_int32_t *tl;
2273 caddr_t cp;
2274 nfsuint64 *cookiep;
2275 caddr_t bpos, dpos;
2276 struct mbuf *mreq, *mrep, *md, *mb;
2277 nfsuint64 cookie;
2278 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2279 struct nfsnode *dnp = VTONFS(vp);
2280 u_quad_t fileno;
2281 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1;
2282 int attrflag;
2283 int v3 = NFS_ISV3(vp);
2284
2285 KASSERT(uiop->uio_iovcnt == 1 &&
2286 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2287 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2288 ("nfs readdirrpc bad uio"));
2289
2290 /*
2291 * If there is no cookie, assume directory was stale.
2292 */
2293 nfs_dircookie_lock(dnp);
2294 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
2295 if (cookiep) {
2296 cookie = *cookiep;
2297 nfs_dircookie_unlock(dnp);
2298 } else {
2299 nfs_dircookie_unlock(dnp);
2300 return (NFSERR_BAD_COOKIE);
2301 }
2302
2303 /*
2304 * Loop around doing readdir rpc's of size nm_readdirsize
2305 * truncated to a multiple of DIRBLKSIZ.
2306 * The stopping criteria is EOF or buffer full.
2307 */
2308 while (more_dirs && bigenough) {
2309 nfsstats.rpccnt[NFSPROC_READDIR]++;
2310 mreq = m_get2(NFSX_FH(v3) + NFSX_READDIR(v3), M_WAITOK,
2311 MT_DATA, 0);
2312 mb = mreq;
2313 bpos = mtod(mb, caddr_t);
2314 nfsm_fhtom(vp, v3);
2315 if (v3) {
2316 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED);
2317 *tl++ = cookie.nfsuquad[0];
2318 *tl++ = cookie.nfsuquad[1];
2319 mtx_lock(&dnp->n_mtx);
2320 *tl++ = dnp->n_cookieverf.nfsuquad[0];
2321 *tl++ = dnp->n_cookieverf.nfsuquad[1];
2322 mtx_unlock(&dnp->n_mtx);
2323 } else {
2324 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
2325 *tl++ = cookie.nfsuquad[0];
2326 }
2327 *tl = txdr_unsigned(nmp->nm_readdirsize);
2328 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred);
2329 if (v3) {
2330 nfsm_postop_attr(vp, attrflag);
2331 if (!error) {
2332 tl = nfsm_dissect(u_int32_t *,
2333 2 * NFSX_UNSIGNED);
2334 mtx_lock(&dnp->n_mtx);
2335 dnp->n_cookieverf.nfsuquad[0] = *tl++;
2336 dnp->n_cookieverf.nfsuquad[1] = *tl;
2337 mtx_unlock(&dnp->n_mtx);
2338 } else {
2339 m_freem(mrep);
2340 goto nfsmout;
2341 }
2342 }
2343 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
2344 more_dirs = fxdr_unsigned(int, *tl);
2345
2346 /* loop thru the dir entries, doctoring them to 4bsd form */
2347 while (more_dirs && bigenough) {
2348 if (v3) {
2349 tl = nfsm_dissect(u_int32_t *,
2350 3 * NFSX_UNSIGNED);
2351 fileno = fxdr_hyper(tl);
2352 len = fxdr_unsigned(int, *(tl + 2));
2353 } else {
2354 tl = nfsm_dissect(u_int32_t *,
2355 2 * NFSX_UNSIGNED);
2356 fileno = fxdr_unsigned(u_quad_t, *tl++);
2357 len = fxdr_unsigned(int, *tl);
2358 }
2359 if (len <= 0 || len > NFS_MAXNAMLEN) {
2360 error = EBADRPC;
2361 m_freem(mrep);
2362 goto nfsmout;
2363 }
2364 tlen = nfsm_rndup(len);
2365 if (tlen == len)
2366 tlen += 4; /* To ensure null termination */
2367 left = DIRBLKSIZ - blksiz;
2368 if ((tlen + DIRHDSIZ) > left) {
2369 dp->d_reclen += left;
2370 uiop->uio_iov->iov_base =
2371 (char *)uiop->uio_iov->iov_base + left;
2372 uiop->uio_iov->iov_len -= left;
2373 uiop->uio_offset += left;
2374 uiop->uio_resid -= left;
2375 blksiz = 0;
2376 }
2377 if ((tlen + DIRHDSIZ) > uiop->uio_resid)
2378 bigenough = 0;
2379 if (bigenough) {
2380 dp = (struct dirent *)uiop->uio_iov->iov_base;
2381 dp->d_fileno = (int)fileno;
2382 dp->d_namlen = len;
2383 dp->d_reclen = tlen + DIRHDSIZ;
2384 dp->d_type = DT_UNKNOWN;
2385 blksiz += dp->d_reclen;
2386 if (blksiz == DIRBLKSIZ)
2387 blksiz = 0;
2388 uiop->uio_offset += DIRHDSIZ;
2389 uiop->uio_resid -= DIRHDSIZ;
2390 uiop->uio_iov->iov_base =
2391 (char *)uiop->uio_iov->iov_base + DIRHDSIZ;
2392 uiop->uio_iov->iov_len -= DIRHDSIZ;
2393 nfsm_mtouio(uiop, len);
2394 cp = uiop->uio_iov->iov_base;
2395 tlen -= len;
2396 *cp = '\0'; /* null terminate */
2397 uiop->uio_iov->iov_base =
2398 (char *)uiop->uio_iov->iov_base + tlen;
2399 uiop->uio_iov->iov_len -= tlen;
2400 uiop->uio_offset += tlen;
2401 uiop->uio_resid -= tlen;
2402 } else
2403 nfsm_adv(nfsm_rndup(len));
2404 if (v3) {
2405 tl = nfsm_dissect(u_int32_t *,
2406 3 * NFSX_UNSIGNED);
2407 } else {
2408 tl = nfsm_dissect(u_int32_t *,
2409 2 * NFSX_UNSIGNED);
2410 }
2411 if (bigenough) {
2412 cookie.nfsuquad[0] = *tl++;
2413 if (v3)
2414 cookie.nfsuquad[1] = *tl++;
2415 } else if (v3)
2416 tl += 2;
2417 else
2418 tl++;
2419 more_dirs = fxdr_unsigned(int, *tl);
2420 }
2421 /*
2422 * If at end of rpc data, get the eof boolean
2423 */
2424 if (!more_dirs) {
2425 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
2426 more_dirs = (fxdr_unsigned(int, *tl) == 0);
2427 }
2428 m_freem(mrep);
2429 }
2430 /*
2431 * Fill last record, iff any, out to a multiple of DIRBLKSIZ
2432 * by increasing d_reclen for the last record.
2433 */
2434 if (blksiz > 0) {
2435 left = DIRBLKSIZ - blksiz;
2436 dp->d_reclen += left;
2437 uiop->uio_iov->iov_base =
2438 (char *)uiop->uio_iov->iov_base + left;
2439 uiop->uio_iov->iov_len -= left;
2440 uiop->uio_offset += left;
2441 uiop->uio_resid -= left;
2442 }
2443
2444 /*
2445 * We are now either at the end of the directory or have filled the
2446 * block.
2447 */
2448 if (bigenough)
2449 dnp->n_direofoffset = uiop->uio_offset;
2450 else {
2451 if (uiop->uio_resid > 0)
2452 nfs_printf("EEK! readdirrpc resid > 0\n");
2453 nfs_dircookie_lock(dnp);
2454 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
2455 *cookiep = cookie;
2456 nfs_dircookie_unlock(dnp);
2457 }
2458 nfsmout:
2459 return (error);
2460 }
2461
2462 /*
2463 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc().
2464 */
2465 int
nfs_readdirplusrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred)2466 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
2467 {
2468 int len, left;
2469 struct dirent *dp;
2470 u_int32_t *tl;
2471 caddr_t cp;
2472 struct vnode *newvp;
2473 nfsuint64 *cookiep;
2474 caddr_t bpos, dpos, dpossav1, dpossav2;
2475 struct mbuf *mreq, *mrep, *md, *mb, *mdsav1, *mdsav2;
2476 struct nameidata nami, *ndp = &nami;
2477 struct componentname *cnp = &ndp->ni_cnd;
2478 nfsuint64 cookie;
2479 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2480 struct nfsnode *dnp = VTONFS(vp), *np;
2481 struct vattr vattr, dvattr;
2482 nfsfh_t *fhp;
2483 u_quad_t fileno;
2484 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i;
2485 int attrflag, dattrflag, fhsize;
2486
2487 #ifndef nolint
2488 dp = NULL;
2489 #endif
2490 KASSERT(uiop->uio_iovcnt == 1 &&
2491 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2492 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2493 ("nfs readdirplusrpc bad uio"));
2494 ndp->ni_dvp = vp;
2495 newvp = NULLVP;
2496
2497 /*
2498 * If there is no cookie, assume directory was stale.
2499 */
2500 nfs_dircookie_lock(dnp);
2501 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
2502 if (cookiep) {
2503 cookie = *cookiep;
2504 nfs_dircookie_unlock(dnp);
2505 } else {
2506 nfs_dircookie_unlock(dnp);
2507 return (NFSERR_BAD_COOKIE);
2508 }
2509 /*
2510 * Loop around doing readdir rpc's of size nm_readdirsize
2511 * truncated to a multiple of DIRBLKSIZ.
2512 * The stopping criteria is EOF or buffer full.
2513 */
2514 while (more_dirs && bigenough) {
2515 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++;
2516 mreq = m_get2(NFSX_FH(1) + 6 * NFSX_UNSIGNED, M_WAITOK,
2517 MT_DATA, 0);
2518 mb = mreq;
2519 bpos = mtod(mb, caddr_t);
2520 nfsm_fhtom(vp, 1);
2521 tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED);
2522 *tl++ = cookie.nfsuquad[0];
2523 *tl++ = cookie.nfsuquad[1];
2524 mtx_lock(&dnp->n_mtx);
2525 *tl++ = dnp->n_cookieverf.nfsuquad[0];
2526 *tl++ = dnp->n_cookieverf.nfsuquad[1];
2527 mtx_unlock(&dnp->n_mtx);
2528 *tl++ = txdr_unsigned(nmp->nm_readdirsize);
2529 *tl = txdr_unsigned(nmp->nm_rsize);
2530 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred);
2531 nfsm_postop_attr_va(vp, dattrflag, &dvattr);
2532 if (error) {
2533 m_freem(mrep);
2534 goto nfsmout;
2535 }
2536 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
2537 mtx_lock(&dnp->n_mtx);
2538 dnp->n_cookieverf.nfsuquad[0] = *tl++;
2539 dnp->n_cookieverf.nfsuquad[1] = *tl++;
2540 mtx_unlock(&dnp->n_mtx);
2541 more_dirs = fxdr_unsigned(int, *tl);
2542
2543 /* loop thru the dir entries, doctoring them to 4bsd form */
2544 while (more_dirs && bigenough) {
2545 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
2546 fileno = fxdr_hyper(tl);
2547 len = fxdr_unsigned(int, *(tl + 2));
2548 if (len <= 0 || len > NFS_MAXNAMLEN) {
2549 error = EBADRPC;
2550 m_freem(mrep);
2551 goto nfsmout;
2552 }
2553 tlen = nfsm_rndup(len);
2554 if (tlen == len)
2555 tlen += 4; /* To ensure null termination*/
2556 left = DIRBLKSIZ - blksiz;
2557 if ((tlen + DIRHDSIZ) > left) {
2558 dp->d_reclen += left;
2559 uiop->uio_iov->iov_base =
2560 (char *)uiop->uio_iov->iov_base + left;
2561 uiop->uio_iov->iov_len -= left;
2562 uiop->uio_offset += left;
2563 uiop->uio_resid -= left;
2564 blksiz = 0;
2565 }
2566 if ((tlen + DIRHDSIZ) > uiop->uio_resid)
2567 bigenough = 0;
2568 if (bigenough) {
2569 dp = (struct dirent *)uiop->uio_iov->iov_base;
2570 dp->d_fileno = (int)fileno;
2571 dp->d_namlen = len;
2572 dp->d_reclen = tlen + DIRHDSIZ;
2573 dp->d_type = DT_UNKNOWN;
2574 blksiz += dp->d_reclen;
2575 if (blksiz == DIRBLKSIZ)
2576 blksiz = 0;
2577 uiop->uio_offset += DIRHDSIZ;
2578 uiop->uio_resid -= DIRHDSIZ;
2579 uiop->uio_iov->iov_base =
2580 (char *)uiop->uio_iov->iov_base + DIRHDSIZ;
2581 uiop->uio_iov->iov_len -= DIRHDSIZ;
2582 cnp->cn_nameptr = uiop->uio_iov->iov_base;
2583 cnp->cn_namelen = len;
2584 nfsm_mtouio(uiop, len);
2585 cp = uiop->uio_iov->iov_base;
2586 tlen -= len;
2587 *cp = '\0';
2588 uiop->uio_iov->iov_base =
2589 (char *)uiop->uio_iov->iov_base + tlen;
2590 uiop->uio_iov->iov_len -= tlen;
2591 uiop->uio_offset += tlen;
2592 uiop->uio_resid -= tlen;
2593 } else
2594 nfsm_adv(nfsm_rndup(len));
2595 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
2596 if (bigenough) {
2597 cookie.nfsuquad[0] = *tl++;
2598 cookie.nfsuquad[1] = *tl++;
2599 } else
2600 tl += 2;
2601
2602 /*
2603 * Since the attributes are before the file handle
2604 * (sigh), we must skip over the attributes and then
2605 * come back and get them.
2606 */
2607 attrflag = fxdr_unsigned(int, *tl);
2608 if (attrflag) {
2609 dpossav1 = dpos;
2610 mdsav1 = md;
2611 nfsm_adv(NFSX_V3FATTR);
2612 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
2613 doit = fxdr_unsigned(int, *tl);
2614 /*
2615 * Skip loading the attrs for "..". There's a
2616 * race between loading the attrs here and
2617 * lookups that look for the directory currently
2618 * being read (in the parent). We try to acquire
2619 * the exclusive lock on ".." here, owning the
2620 * lock on the directory being read. Lookup will
2621 * hold the lock on ".." and try to acquire the
2622 * lock on the directory being read.
2623 *
2624 * There are other ways of fixing this, one would
2625 * be to do a trylock on the ".." vnode and skip
2626 * loading the attrs on ".." if it happens to be
2627 * locked by another process. But skipping the
2628 * attrload on ".." seems the easiest option.
2629 */
2630 if (strcmp(dp->d_name, "..") == 0) {
2631 doit = 0;
2632 /*
2633 * We've already skipped over the attrs,
2634 * skip over the filehandle. And store d_type
2635 * as VDIR.
2636 */
2637 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
2638 i = fxdr_unsigned(int, *tl);
2639 nfsm_adv(nfsm_rndup(i));
2640 dp->d_type = IFTODT(VTTOIF(VDIR));
2641 }
2642 if (doit) {
2643 nfsm_getfh(fhp, fhsize, 1);
2644 if (NFS_CMPFH(dnp, fhp, fhsize)) {
2645 VREF(vp);
2646 newvp = vp;
2647 np = dnp;
2648 } else {
2649 error = nfs_nget(vp->v_mount, fhp,
2650 fhsize, &np, LK_EXCLUSIVE);
2651 if (error)
2652 doit = 0;
2653 else
2654 newvp = NFSTOV(np);
2655 }
2656 }
2657 if (doit && bigenough) {
2658 dpossav2 = dpos;
2659 dpos = dpossav1;
2660 mdsav2 = md;
2661 md = mdsav1;
2662 nfsm_loadattr(newvp, &vattr);
2663 dpos = dpossav2;
2664 md = mdsav2;
2665 dp->d_type = IFTODT(VTTOIF(vattr.va_type));
2666 ndp->ni_vp = newvp;
2667 if (newvp->v_type != VDIR || dattrflag != 0)
2668 cache_enter_time(ndp->ni_dvp, ndp->ni_vp,
2669 cnp, &vattr.va_ctime,
2670 newvp->v_type != VDIR ? NULL :
2671 &dvattr.va_ctime);
2672 }
2673 } else {
2674 /* Just skip over the file handle */
2675 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
2676 i = fxdr_unsigned(int, *tl);
2677 if (i) {
2678 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
2679 fhsize = fxdr_unsigned(int, *tl);
2680 nfsm_adv(nfsm_rndup(fhsize));
2681 }
2682 }
2683 if (newvp != NULLVP) {
2684 if (newvp == vp)
2685 vrele(newvp);
2686 else
2687 vput(newvp);
2688 newvp = NULLVP;
2689 }
2690 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
2691 more_dirs = fxdr_unsigned(int, *tl);
2692 }
2693 /*
2694 * If at end of rpc data, get the eof boolean
2695 */
2696 if (!more_dirs) {
2697 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
2698 more_dirs = (fxdr_unsigned(int, *tl) == 0);
2699 }
2700 m_freem(mrep);
2701 }
2702 /*
2703 * Fill last record, iff any, out to a multiple of DIRBLKSIZ
2704 * by increasing d_reclen for the last record.
2705 */
2706 if (blksiz > 0) {
2707 left = DIRBLKSIZ - blksiz;
2708 dp->d_reclen += left;
2709 uiop->uio_iov->iov_base =
2710 (char *)uiop->uio_iov->iov_base + left;
2711 uiop->uio_iov->iov_len -= left;
2712 uiop->uio_offset += left;
2713 uiop->uio_resid -= left;
2714 }
2715
2716 /*
2717 * We are now either at the end of the directory or have filled the
2718 * block.
2719 */
2720 if (bigenough)
2721 dnp->n_direofoffset = uiop->uio_offset;
2722 else {
2723 if (uiop->uio_resid > 0)
2724 nfs_printf("EEK! readdirplusrpc resid > 0\n");
2725 nfs_dircookie_lock(dnp);
2726 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
2727 *cookiep = cookie;
2728 nfs_dircookie_unlock(dnp);
2729 }
2730 nfsmout:
2731 if (newvp != NULLVP) {
2732 if (newvp == vp)
2733 vrele(newvp);
2734 else
2735 vput(newvp);
2736 newvp = NULLVP;
2737 }
2738 return (error);
2739 }
2740
2741 /*
2742 * Silly rename. To make the NFS filesystem that is stateless look a little
2743 * more like the "ufs" a remove of an active vnode is translated to a rename
2744 * to a funny looking filename that is removed by nfs_inactive on the
2745 * nfsnode. There is the potential for another process on a different client
2746 * to create the same funny name between the nfs_lookitup() fails and the
2747 * nfs_rename() completes, but...
2748 */
2749 static int
nfs_sillyrename(struct vnode * dvp,struct vnode * vp,struct componentname * cnp)2750 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
2751 {
2752 struct sillyrename *sp;
2753 struct nfsnode *np;
2754 int error;
2755 short pid;
2756 unsigned int lticks;
2757
2758 cache_purge(dvp);
2759 np = VTONFS(vp);
2760 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
2761 sp = malloc(sizeof (struct sillyrename),
2762 M_NFSREQ, M_WAITOK);
2763 sp->s_cred = crhold(cnp->cn_cred);
2764 sp->s_dvp = dvp;
2765 sp->s_removeit = nfs_removeit;
2766 VREF(dvp);
2767
2768 /*
2769 * Fudge together a funny name.
2770 * Changing the format of the funny name to accomodate more
2771 * sillynames per directory.
2772 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is
2773 * CPU ticks since boot.
2774 */
2775 pid = cnp->cn_thread->td_proc->p_pid;
2776 lticks = (unsigned int)ticks;
2777 for ( ; ; ) {
2778 sp->s_namlen = sprintf(sp->s_name,
2779 ".nfs.%08x.%04x4.4", lticks,
2780 pid);
2781 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2782 cnp->cn_thread, NULL))
2783 break;
2784 lticks++;
2785 }
2786 error = nfs_renameit(dvp, cnp, sp);
2787 if (error)
2788 goto bad;
2789 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2790 cnp->cn_thread, &np);
2791 np->n_sillyrename = sp;
2792 return (0);
2793 bad:
2794 vrele(sp->s_dvp);
2795 crfree(sp->s_cred);
2796 free((caddr_t)sp, M_NFSREQ);
2797 return (error);
2798 }
2799
2800 /*
2801 * Look up a file name and optionally either update the file handle or
2802 * allocate an nfsnode, depending on the value of npp.
2803 * npp == NULL --> just do the lookup
2804 * *npp == NULL --> allocate a new nfsnode and make sure attributes are
2805 * handled too
2806 * *npp != NULL --> update the file handle in the vnode
2807 */
2808 static int
nfs_lookitup(struct vnode * dvp,const char * name,int len,struct ucred * cred,struct thread * td,struct nfsnode ** npp)2809 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred,
2810 struct thread *td, struct nfsnode **npp)
2811 {
2812 struct vnode *newvp = NULL;
2813 struct nfsnode *np, *dnp = VTONFS(dvp);
2814 caddr_t bpos, dpos;
2815 int error = 0, fhlen, attrflag;
2816 struct mbuf *mreq, *mrep, *md, *mb;
2817 nfsfh_t *nfhp;
2818 int v3 = NFS_ISV3(dvp);
2819
2820 nfsstats.rpccnt[NFSPROC_LOOKUP]++;
2821 mreq = m_get2(NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len),
2822 M_WAITOK, MT_DATA, 0);
2823 mb = mreq;
2824 bpos = mtod(mb, caddr_t);
2825 nfsm_fhtom(dvp, v3);
2826 nfsm_strtom(name, len, NFS_MAXNAMLEN);
2827 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred);
2828 if (npp && !error) {
2829 nfsm_getfh(nfhp, fhlen, v3);
2830 if (*npp) {
2831 np = *npp;
2832 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) {
2833 free((caddr_t)np->n_fhp, M_NFSBIGFH);
2834 np->n_fhp = &np->n_fh;
2835 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH)
2836 np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK);
2837 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen);
2838 np->n_fhsize = fhlen;
2839 newvp = NFSTOV(np);
2840 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) {
2841 VREF(dvp);
2842 newvp = dvp;
2843 } else {
2844 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np, LK_EXCLUSIVE);
2845 if (error) {
2846 m_freem(mrep);
2847 return (error);
2848 }
2849 newvp = NFSTOV(np);
2850 }
2851 if (v3) {
2852 nfsm_postop_attr(newvp, attrflag);
2853 if (!attrflag && *npp == NULL) {
2854 m_freem(mrep);
2855 if (newvp == dvp)
2856 vrele(newvp);
2857 else
2858 vput(newvp);
2859 return (ENOENT);
2860 }
2861 } else
2862 nfsm_loadattr(newvp, NULL);
2863 }
2864 m_freem(mrep);
2865 nfsmout:
2866 if (npp && *npp == NULL) {
2867 if (error) {
2868 if (newvp) {
2869 if (newvp == dvp)
2870 vrele(newvp);
2871 else
2872 vput(newvp);
2873 }
2874 } else
2875 *npp = np;
2876 }
2877 return (error);
2878 }
2879
2880 /*
2881 * Nfs Version 3 commit rpc
2882 */
2883 int
nfs_commit(struct vnode * vp,u_quad_t offset,int cnt,struct ucred * cred,struct thread * td)2884 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
2885 struct thread *td)
2886 {
2887 u_int32_t *tl;
2888 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2889 caddr_t bpos, dpos;
2890 int error = 0, wccflag = NFSV3_WCCRATTR;
2891 struct mbuf *mreq, *mrep, *md, *mb;
2892
2893 mtx_lock(&nmp->nm_mtx);
2894 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
2895 mtx_unlock(&nmp->nm_mtx);
2896 return (0);
2897 }
2898 mtx_unlock(&nmp->nm_mtx);
2899 nfsstats.rpccnt[NFSPROC_COMMIT]++;
2900 mreq = m_get2(NFSX_FH(1), M_WAITOK, MT_DATA, 0);
2901 mb = mreq;
2902 bpos = mtod(mb, caddr_t);
2903 nfsm_fhtom(vp, 1);
2904 tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED);
2905 txdr_hyper(offset, tl);
2906 tl += 2;
2907 *tl = txdr_unsigned(cnt);
2908 nfsm_request(vp, NFSPROC_COMMIT, td, cred);
2909 nfsm_wcc_data(vp, wccflag);
2910 if (!error) {
2911 tl = nfsm_dissect(u_int32_t *, NFSX_V3WRITEVERF);
2912 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl,
2913 NFSX_V3WRITEVERF)) {
2914 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
2915 NFSX_V3WRITEVERF);
2916 error = NFSERR_STALEWRITEVERF;
2917 }
2918 }
2919 m_freem(mrep);
2920 nfsmout:
2921 return (error);
2922 }
2923
2924 /*
2925 * Strategy routine.
2926 * For async requests when nfsiod(s) are running, queue the request by
2927 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the
2928 * request.
2929 */
2930 static int
nfs_strategy(struct vop_strategy_args * ap)2931 nfs_strategy(struct vop_strategy_args *ap)
2932 {
2933 struct buf *bp = ap->a_bp;
2934 struct ucred *cr;
2935
2936 KASSERT(!(bp->b_flags & B_DONE),
2937 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
2938 BUF_ASSERT_HELD(bp);
2939
2940 if (bp->b_iocmd == BIO_READ)
2941 cr = bp->b_rcred;
2942 else
2943 cr = bp->b_wcred;
2944
2945 /*
2946 * If the op is asynchronous and an i/o daemon is waiting
2947 * queue the request, wake it up and wait for completion
2948 * otherwise just do it ourselves.
2949 */
2950 if ((bp->b_flags & B_ASYNC) == 0 ||
2951 nfs_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
2952 (void)nfs_doio(ap->a_vp, bp, cr, curthread);
2953 return (0);
2954 }
2955
2956 /*
2957 * fsync vnode op. Just call nfs_flush() with commit == 1.
2958 */
2959 /* ARGSUSED */
2960 static int
nfs_fsync(struct vop_fsync_args * ap)2961 nfs_fsync(struct vop_fsync_args *ap)
2962 {
2963
2964 return (nfs_flush(ap->a_vp, ap->a_waitfor, 1));
2965 }
2966
2967 /*
2968 * Flush all the blocks associated with a vnode.
2969 * Walk through the buffer pool and push any dirty pages
2970 * associated with the vnode.
2971 */
2972 static int
nfs_flush(struct vnode * vp,int waitfor,int commit)2973 nfs_flush(struct vnode *vp, int waitfor, int commit)
2974 {
2975 struct nfsnode *np = VTONFS(vp);
2976 struct buf *bp;
2977 int i;
2978 struct buf *nbp;
2979 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2980 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
2981 int passone = 1;
2982 u_quad_t off, endoff, toff;
2983 struct ucred* wcred = NULL;
2984 struct buf **bvec = NULL;
2985 struct bufobj *bo;
2986 struct thread *td = curthread;
2987 #ifndef NFS_COMMITBVECSIZ
2988 #define NFS_COMMITBVECSIZ 20
2989 #endif
2990 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
2991 int bvecsize = 0, bveccount;
2992
2993 if (nmp->nm_flag & NFSMNT_INT)
2994 slpflag = PCATCH;
2995 if (!commit)
2996 passone = 0;
2997 bo = &vp->v_bufobj;
2998 /*
2999 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
3000 * server, but has not been committed to stable storage on the server
3001 * yet. On the first pass, the byte range is worked out and the commit
3002 * rpc is done. On the second pass, nfs_writebp() is called to do the
3003 * job.
3004 */
3005 again:
3006 off = (u_quad_t)-1;
3007 endoff = 0;
3008 bvecpos = 0;
3009 if (NFS_ISV3(vp) && commit) {
3010 if (bvec != NULL && bvec != bvec_on_stack)
3011 free(bvec, M_TEMP);
3012 /*
3013 * Count up how many buffers waiting for a commit.
3014 */
3015 bveccount = 0;
3016 BO_LOCK(bo);
3017 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
3018 if (!BUF_ISLOCKED(bp) &&
3019 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
3020 == (B_DELWRI | B_NEEDCOMMIT))
3021 bveccount++;
3022 }
3023 /*
3024 * Allocate space to remember the list of bufs to commit. It is
3025 * important to use M_NOWAIT here to avoid a race with nfs_write.
3026 * If we can't get memory (for whatever reason), we will end up
3027 * committing the buffers one-by-one in the loop below.
3028 */
3029 if (bveccount > NFS_COMMITBVECSIZ) {
3030 /*
3031 * Release the vnode interlock to avoid a lock
3032 * order reversal.
3033 */
3034 BO_UNLOCK(bo);
3035 bvec = (struct buf **)
3036 malloc(bveccount * sizeof(struct buf *),
3037 M_TEMP, M_NOWAIT);
3038 BO_LOCK(bo);
3039 if (bvec == NULL) {
3040 bvec = bvec_on_stack;
3041 bvecsize = NFS_COMMITBVECSIZ;
3042 } else
3043 bvecsize = bveccount;
3044 } else {
3045 bvec = bvec_on_stack;
3046 bvecsize = NFS_COMMITBVECSIZ;
3047 }
3048 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
3049 if (bvecpos >= bvecsize)
3050 break;
3051 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
3052 nbp = TAILQ_NEXT(bp, b_bobufs);
3053 continue;
3054 }
3055 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
3056 (B_DELWRI | B_NEEDCOMMIT)) {
3057 BUF_UNLOCK(bp);
3058 nbp = TAILQ_NEXT(bp, b_bobufs);
3059 continue;
3060 }
3061 BO_UNLOCK(bo);
3062 bremfree(bp);
3063 /*
3064 * Work out if all buffers are using the same cred
3065 * so we can deal with them all with one commit.
3066 *
3067 * NOTE: we are not clearing B_DONE here, so we have
3068 * to do it later on in this routine if we intend to
3069 * initiate I/O on the bp.
3070 *
3071 * Note: to avoid loopback deadlocks, we do not
3072 * assign b_runningbufspace.
3073 */
3074 if (wcred == NULL)
3075 wcred = bp->b_wcred;
3076 else if (wcred != bp->b_wcred)
3077 wcred = NOCRED;
3078 vfs_busy_pages(bp, 1);
3079
3080 BO_LOCK(bo);
3081 /*
3082 * bp is protected by being locked, but nbp is not
3083 * and vfs_busy_pages() may sleep. We have to
3084 * recalculate nbp.
3085 */
3086 nbp = TAILQ_NEXT(bp, b_bobufs);
3087
3088 /*
3089 * A list of these buffers is kept so that the
3090 * second loop knows which buffers have actually
3091 * been committed. This is necessary, since there
3092 * may be a race between the commit rpc and new
3093 * uncommitted writes on the file.
3094 */
3095 bvec[bvecpos++] = bp;
3096 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
3097 bp->b_dirtyoff;
3098 if (toff < off)
3099 off = toff;
3100 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
3101 if (toff > endoff)
3102 endoff = toff;
3103 }
3104 BO_UNLOCK(bo);
3105 }
3106 if (bvecpos > 0) {
3107 /*
3108 * Commit data on the server, as required.
3109 * If all bufs are using the same wcred, then use that with
3110 * one call for all of them, otherwise commit each one
3111 * separately.
3112 */
3113 if (wcred != NOCRED)
3114 retv = nfs_commit(vp, off, (int)(endoff - off),
3115 wcred, td);
3116 else {
3117 retv = 0;
3118 for (i = 0; i < bvecpos; i++) {
3119 off_t off, size;
3120 bp = bvec[i];
3121 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
3122 bp->b_dirtyoff;
3123 size = (u_quad_t)(bp->b_dirtyend
3124 - bp->b_dirtyoff);
3125 retv = nfs_commit(vp, off, (int)size,
3126 bp->b_wcred, td);
3127 if (retv) break;
3128 }
3129 }
3130
3131 if (retv == NFSERR_STALEWRITEVERF)
3132 nfs_clearcommit(vp->v_mount);
3133
3134 /*
3135 * Now, either mark the blocks I/O done or mark the
3136 * blocks dirty, depending on whether the commit
3137 * succeeded.
3138 */
3139 for (i = 0; i < bvecpos; i++) {
3140 bp = bvec[i];
3141 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
3142 if (retv) {
3143 /*
3144 * Error, leave B_DELWRI intact
3145 */
3146 vfs_unbusy_pages(bp);
3147 brelse(bp);
3148 } else {
3149 /*
3150 * Success, remove B_DELWRI ( bundirty() ).
3151 *
3152 * b_dirtyoff/b_dirtyend seem to be NFS
3153 * specific. We should probably move that
3154 * into bundirty(). XXX
3155 */
3156 bufobj_wref(bo);
3157 bp->b_flags |= B_ASYNC;
3158 bundirty(bp);
3159 bp->b_flags &= ~B_DONE;
3160 bp->b_ioflags &= ~BIO_ERROR;
3161 bp->b_dirtyoff = bp->b_dirtyend = 0;
3162 bufdone(bp);
3163 }
3164 }
3165 }
3166
3167 /*
3168 * Start/do any write(s) that are required.
3169 */
3170 loop:
3171 BO_LOCK(bo);
3172 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
3173 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
3174 if (waitfor != MNT_WAIT || passone)
3175 continue;
3176
3177 error = BUF_TIMELOCK(bp,
3178 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
3179 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo);
3180 if (error == 0) {
3181 BUF_UNLOCK(bp);
3182 goto loop;
3183 }
3184 if (error == ENOLCK) {
3185 error = 0;
3186 goto loop;
3187 }
3188 if (nfs_sigintr(nmp, td)) {
3189 error = EINTR;
3190 goto done;
3191 }
3192 if (slpflag == PCATCH) {
3193 slpflag = 0;
3194 slptimeo = 2 * hz;
3195 }
3196 goto loop;
3197 }
3198 if ((bp->b_flags & B_DELWRI) == 0)
3199 panic("nfs_fsync: not dirty");
3200 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
3201 BUF_UNLOCK(bp);
3202 continue;
3203 }
3204 BO_UNLOCK(bo);
3205 bremfree(bp);
3206 if (passone || !commit)
3207 bp->b_flags |= B_ASYNC;
3208 else
3209 bp->b_flags |= B_ASYNC;
3210 bwrite(bp);
3211 if (nfs_sigintr(nmp, td)) {
3212 error = EINTR;
3213 goto done;
3214 }
3215 goto loop;
3216 }
3217 if (passone) {
3218 passone = 0;
3219 BO_UNLOCK(bo);
3220 goto again;
3221 }
3222 if (waitfor == MNT_WAIT) {
3223 while (bo->bo_numoutput) {
3224 error = bufobj_wwait(bo, slpflag, slptimeo);
3225 if (error) {
3226 BO_UNLOCK(bo);
3227 error = nfs_sigintr(nmp, td);
3228 if (error)
3229 goto done;
3230 if (slpflag == PCATCH) {
3231 slpflag = 0;
3232 slptimeo = 2 * hz;
3233 }
3234 BO_LOCK(bo);
3235 }
3236 }
3237 if (bo->bo_dirty.bv_cnt != 0 && commit) {
3238 BO_UNLOCK(bo);
3239 goto loop;
3240 }
3241 /*
3242 * Wait for all the async IO requests to drain
3243 */
3244 BO_UNLOCK(bo);
3245 mtx_lock(&np->n_mtx);
3246 while (np->n_directio_asyncwr > 0) {
3247 np->n_flag |= NFSYNCWAIT;
3248 error = nfs_msleep(td, (caddr_t)&np->n_directio_asyncwr,
3249 &np->n_mtx, slpflag | (PRIBIO + 1),
3250 "nfsfsync", 0);
3251 if (error) {
3252 if (nfs_sigintr(nmp, td)) {
3253 mtx_unlock(&np->n_mtx);
3254 error = EINTR;
3255 goto done;
3256 }
3257 }
3258 }
3259 mtx_unlock(&np->n_mtx);
3260 } else
3261 BO_UNLOCK(bo);
3262 mtx_lock(&np->n_mtx);
3263 if (np->n_flag & NWRITEERR) {
3264 error = np->n_error;
3265 np->n_flag &= ~NWRITEERR;
3266 }
3267 if (commit && bo->bo_dirty.bv_cnt == 0 &&
3268 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
3269 np->n_flag &= ~NMODIFIED;
3270 mtx_unlock(&np->n_mtx);
3271 done:
3272 if (bvec != NULL && bvec != bvec_on_stack)
3273 free(bvec, M_TEMP);
3274 return (error);
3275 }
3276
3277 /*
3278 * NFS advisory byte-level locks.
3279 */
3280 static int
nfs_advlock(struct vop_advlock_args * ap)3281 nfs_advlock(struct vop_advlock_args *ap)
3282 {
3283 struct vnode *vp = ap->a_vp;
3284 u_quad_t size;
3285 int error;
3286
3287 error = vn_lock(vp, LK_SHARED);
3288 if (error)
3289 return (error);
3290 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
3291 size = VTONFS(vp)->n_size;
3292 VOP_UNLOCK(vp, 0);
3293 error = lf_advlock(ap, &(vp->v_lockf), size);
3294 } else {
3295 if (nfs_advlock_p)
3296 error = nfs_advlock_p(ap);
3297 else
3298 error = ENOLCK;
3299 }
3300
3301 return (error);
3302 }
3303
3304 /*
3305 * NFS advisory byte-level locks.
3306 */
3307 static int
nfs_advlockasync(struct vop_advlockasync_args * ap)3308 nfs_advlockasync(struct vop_advlockasync_args *ap)
3309 {
3310 struct vnode *vp = ap->a_vp;
3311 u_quad_t size;
3312 int error;
3313
3314 error = vn_lock(vp, LK_SHARED);
3315 if (error)
3316 return (error);
3317 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
3318 size = VTONFS(vp)->n_size;
3319 VOP_UNLOCK(vp, 0);
3320 error = lf_advlockasync(ap, &(vp->v_lockf), size);
3321 } else {
3322 VOP_UNLOCK(vp, 0);
3323 error = EOPNOTSUPP;
3324 }
3325 return (error);
3326 }
3327
3328 /*
3329 * Print out the contents of an nfsnode.
3330 */
3331 static int
nfs_print(struct vop_print_args * ap)3332 nfs_print(struct vop_print_args *ap)
3333 {
3334 struct vnode *vp = ap->a_vp;
3335 struct nfsnode *np = VTONFS(vp);
3336
3337 nfs_printf("\tfileid %ld fsid 0x%x",
3338 np->n_vattr.va_fileid, np->n_vattr.va_fsid);
3339 if (vp->v_type == VFIFO)
3340 fifo_printinfo(vp);
3341 printf("\n");
3342 return (0);
3343 }
3344
3345 /*
3346 * This is the "real" nfs::bwrite(struct buf*).
3347 * We set B_CACHE if this is a VMIO buffer.
3348 */
3349 int
nfs_writebp(struct buf * bp,int force __unused,struct thread * td)3350 nfs_writebp(struct buf *bp, int force __unused, struct thread *td)
3351 {
3352 int s;
3353 int oldflags = bp->b_flags;
3354 #if 0
3355 int retv = 1;
3356 off_t off;
3357 #endif
3358
3359 BUF_ASSERT_HELD(bp);
3360
3361 if (bp->b_flags & B_INVAL) {
3362 brelse(bp);
3363 return(0);
3364 }
3365
3366 bp->b_flags |= B_CACHE;
3367
3368 /*
3369 * Undirty the bp. We will redirty it later if the I/O fails.
3370 */
3371
3372 s = splbio();
3373 bundirty(bp);
3374 bp->b_flags &= ~B_DONE;
3375 bp->b_ioflags &= ~BIO_ERROR;
3376 bp->b_iocmd = BIO_WRITE;
3377
3378 bufobj_wref(bp->b_bufobj);
3379 curthread->td_ru.ru_oublock++;
3380 splx(s);
3381
3382 /*
3383 * Note: to avoid loopback deadlocks, we do not
3384 * assign b_runningbufspace.
3385 */
3386 vfs_busy_pages(bp, 1);
3387
3388 BUF_KERNPROC(bp);
3389 bp->b_iooffset = dbtob(bp->b_blkno);
3390 bstrategy(bp);
3391
3392 if( (oldflags & B_ASYNC) == 0) {
3393 int rtval = bufwait(bp);
3394
3395 if (oldflags & B_DELWRI) {
3396 s = splbio();
3397 reassignbuf(bp);
3398 splx(s);
3399 }
3400 brelse(bp);
3401 return (rtval);
3402 }
3403
3404 return (0);
3405 }
3406
3407 /*
3408 * nfs special file access vnode op.
3409 * Essentially just get vattr and then imitate iaccess() since the device is
3410 * local to the client.
3411 */
3412 static int
nfsspec_access(struct vop_access_args * ap)3413 nfsspec_access(struct vop_access_args *ap)
3414 {
3415 struct vattr *vap;
3416 struct ucred *cred = ap->a_cred;
3417 struct vnode *vp = ap->a_vp;
3418 accmode_t accmode = ap->a_accmode;
3419 struct vattr vattr;
3420 int error;
3421
3422 /*
3423 * Disallow write attempts on filesystems mounted read-only;
3424 * unless the file is a socket, fifo, or a block or character
3425 * device resident on the filesystem.
3426 */
3427 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
3428 switch (vp->v_type) {
3429 case VREG:
3430 case VDIR:
3431 case VLNK:
3432 return (EROFS);
3433 default:
3434 break;
3435 }
3436 }
3437 vap = &vattr;
3438 error = VOP_GETATTR(vp, vap, cred);
3439 if (error)
3440 goto out;
3441 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
3442 accmode, cred, NULL);
3443 out:
3444 return error;
3445 }
3446
3447 /*
3448 * Read wrapper for fifos.
3449 */
3450 static int
nfsfifo_read(struct vop_read_args * ap)3451 nfsfifo_read(struct vop_read_args *ap)
3452 {
3453 struct nfsnode *np = VTONFS(ap->a_vp);
3454 int error;
3455
3456 /*
3457 * Set access flag.
3458 */
3459 mtx_lock(&np->n_mtx);
3460 np->n_flag |= NACC;
3461 vfs_timestamp(&np->n_atim);
3462 mtx_unlock(&np->n_mtx);
3463 error = fifo_specops.vop_read(ap);
3464 return error;
3465 }
3466
3467 /*
3468 * Write wrapper for fifos.
3469 */
3470 static int
nfsfifo_write(struct vop_write_args * ap)3471 nfsfifo_write(struct vop_write_args *ap)
3472 {
3473 struct nfsnode *np = VTONFS(ap->a_vp);
3474
3475 /*
3476 * Set update flag.
3477 */
3478 mtx_lock(&np->n_mtx);
3479 np->n_flag |= NUPD;
3480 vfs_timestamp(&np->n_mtim);
3481 mtx_unlock(&np->n_mtx);
3482 return(fifo_specops.vop_write(ap));
3483 }
3484
3485 /*
3486 * Close wrapper for fifos.
3487 *
3488 * Update the times on the nfsnode then do fifo close.
3489 */
3490 static int
nfsfifo_close(struct vop_close_args * ap)3491 nfsfifo_close(struct vop_close_args *ap)
3492 {
3493 struct vnode *vp = ap->a_vp;
3494 struct nfsnode *np = VTONFS(vp);
3495 struct vattr vattr;
3496 struct timespec ts;
3497
3498 mtx_lock(&np->n_mtx);
3499 if (np->n_flag & (NACC | NUPD)) {
3500 vfs_timestamp(&ts);
3501 if (np->n_flag & NACC)
3502 np->n_atim = ts;
3503 if (np->n_flag & NUPD)
3504 np->n_mtim = ts;
3505 np->n_flag |= NCHG;
3506 if (vrefcnt(vp) == 1 &&
3507 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
3508 VATTR_NULL(&vattr);
3509 if (np->n_flag & NACC)
3510 vattr.va_atime = np->n_atim;
3511 if (np->n_flag & NUPD)
3512 vattr.va_mtime = np->n_mtim;
3513 mtx_unlock(&np->n_mtx);
3514 (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
3515 goto out;
3516 }
3517 }
3518 mtx_unlock(&np->n_mtx);
3519 out:
3520 return (fifo_specops.vop_close(ap));
3521 }
3522
3523 /*
3524 * Just call nfs_writebp() with the force argument set to 1.
3525 *
3526 * NOTE: B_DONE may or may not be set in a_bp on call.
3527 */
3528 static int
nfs_bwrite(struct buf * bp)3529 nfs_bwrite(struct buf *bp)
3530 {
3531
3532 return (nfs_writebp(bp, 1, curthread));
3533 }
3534
3535 struct buf_ops buf_ops_nfs = {
3536 .bop_name = "buf_ops_nfs",
3537 .bop_write = nfs_bwrite,
3538 .bop_strategy = bufstrategy,
3539 .bop_sync = bufsync,
3540 .bop_bdflush = bufbdflush,
3541 };
3542