1 /*-
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * from nfs_vnops.c 8.16 (Berkeley) 5/27/95
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: releng/10.1/sys/fs/nfsclient/nfs_clvnops.c 269283 2014-07-30 03:56:17Z kib $");
37
38 /*
39 * vnode op calls for Sun NFS version 2, 3 and 4
40 */
41
42 #include "opt_kdtrace.h"
43 #include "opt_inet.h"
44
45 #include <sys/param.h>
46 #include <sys/kernel.h>
47 #include <sys/systm.h>
48 #include <sys/resourcevar.h>
49 #include <sys/proc.h>
50 #include <sys/mount.h>
51 #include <sys/bio.h>
52 #include <sys/buf.h>
53 #include <sys/jail.h>
54 #include <sys/malloc.h>
55 #include <sys/mbuf.h>
56 #include <sys/namei.h>
57 #include <sys/socket.h>
58 #include <sys/vnode.h>
59 #include <sys/dirent.h>
60 #include <sys/fcntl.h>
61 #include <sys/lockf.h>
62 #include <sys/stat.h>
63 #include <sys/sysctl.h>
64 #include <sys/signalvar.h>
65
66 #include <vm/vm.h>
67 #include <vm/vm_extern.h>
68 #include <vm/vm_object.h>
69
70 #include <fs/nfs/nfsport.h>
71 #include <fs/nfsclient/nfsnode.h>
72 #include <fs/nfsclient/nfsmount.h>
73 #include <fs/nfsclient/nfs.h>
74 #include <fs/nfsclient/nfs_kdtrace.h>
75
76 #include <net/if.h>
77 #include <netinet/in.h>
78 #include <netinet/in_var.h>
79
80 #include <nfs/nfs_lock.h>
81
82 #ifdef KDTRACE_HOOKS
83 #include <sys/dtrace_bsd.h>
84
85 dtrace_nfsclient_accesscache_flush_probe_func_t
86 dtrace_nfscl_accesscache_flush_done_probe;
87 uint32_t nfscl_accesscache_flush_done_id;
88
89 dtrace_nfsclient_accesscache_get_probe_func_t
90 dtrace_nfscl_accesscache_get_hit_probe,
91 dtrace_nfscl_accesscache_get_miss_probe;
92 uint32_t nfscl_accesscache_get_hit_id;
93 uint32_t nfscl_accesscache_get_miss_id;
94
95 dtrace_nfsclient_accesscache_load_probe_func_t
96 dtrace_nfscl_accesscache_load_done_probe;
97 uint32_t nfscl_accesscache_load_done_id;
98 #endif /* !KDTRACE_HOOKS */
99
100 /* Defs */
101 #define TRUE 1
102 #define FALSE 0
103
104 extern struct nfsstats newnfsstats;
105 extern int nfsrv_useacl;
106 extern int nfscl_debuglevel;
107 MALLOC_DECLARE(M_NEWNFSREQ);
108
109 /*
110 * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
111 * calls are not in getblk() and brelse() so that they would not be necessary
112 * here.
113 */
114 #ifndef B_VMIO
115 #define vfs_busy_pages(bp, f)
116 #endif
117
118 static vop_read_t nfsfifo_read;
119 static vop_write_t nfsfifo_write;
120 static vop_close_t nfsfifo_close;
121 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
122 struct thread *);
123 static vop_lookup_t nfs_lookup;
124 static vop_create_t nfs_create;
125 static vop_mknod_t nfs_mknod;
126 static vop_open_t nfs_open;
127 static vop_pathconf_t nfs_pathconf;
128 static vop_close_t nfs_close;
129 static vop_access_t nfs_access;
130 static vop_getattr_t nfs_getattr;
131 static vop_setattr_t nfs_setattr;
132 static vop_read_t nfs_read;
133 static vop_fsync_t nfs_fsync;
134 static vop_remove_t nfs_remove;
135 static vop_link_t nfs_link;
136 static vop_rename_t nfs_rename;
137 static vop_mkdir_t nfs_mkdir;
138 static vop_rmdir_t nfs_rmdir;
139 static vop_symlink_t nfs_symlink;
140 static vop_readdir_t nfs_readdir;
141 static vop_strategy_t nfs_strategy;
142 static vop_lock1_t nfs_lock1;
143 static int nfs_lookitup(struct vnode *, char *, int,
144 struct ucred *, struct thread *, struct nfsnode **);
145 static int nfs_sillyrename(struct vnode *, struct vnode *,
146 struct componentname *);
147 static vop_access_t nfsspec_access;
148 static vop_readlink_t nfs_readlink;
149 static vop_print_t nfs_print;
150 static vop_advlock_t nfs_advlock;
151 static vop_advlockasync_t nfs_advlockasync;
152 static vop_getacl_t nfs_getacl;
153 static vop_setacl_t nfs_setacl;
154
155 /*
156 * Global vfs data structures for nfs
157 */
158 struct vop_vector newnfs_vnodeops = {
159 .vop_default = &default_vnodeops,
160 .vop_access = nfs_access,
161 .vop_advlock = nfs_advlock,
162 .vop_advlockasync = nfs_advlockasync,
163 .vop_close = nfs_close,
164 .vop_create = nfs_create,
165 .vop_fsync = nfs_fsync,
166 .vop_getattr = nfs_getattr,
167 .vop_getpages = ncl_getpages,
168 .vop_putpages = ncl_putpages,
169 .vop_inactive = ncl_inactive,
170 .vop_link = nfs_link,
171 .vop_lock1 = nfs_lock1,
172 .vop_lookup = nfs_lookup,
173 .vop_mkdir = nfs_mkdir,
174 .vop_mknod = nfs_mknod,
175 .vop_open = nfs_open,
176 .vop_pathconf = nfs_pathconf,
177 .vop_print = nfs_print,
178 .vop_read = nfs_read,
179 .vop_readdir = nfs_readdir,
180 .vop_readlink = nfs_readlink,
181 .vop_reclaim = ncl_reclaim,
182 .vop_remove = nfs_remove,
183 .vop_rename = nfs_rename,
184 .vop_rmdir = nfs_rmdir,
185 .vop_setattr = nfs_setattr,
186 .vop_strategy = nfs_strategy,
187 .vop_symlink = nfs_symlink,
188 .vop_write = ncl_write,
189 .vop_getacl = nfs_getacl,
190 .vop_setacl = nfs_setacl,
191 };
192
193 struct vop_vector newnfs_fifoops = {
194 .vop_default = &fifo_specops,
195 .vop_access = nfsspec_access,
196 .vop_close = nfsfifo_close,
197 .vop_fsync = nfs_fsync,
198 .vop_getattr = nfs_getattr,
199 .vop_inactive = ncl_inactive,
200 .vop_print = nfs_print,
201 .vop_read = nfsfifo_read,
202 .vop_reclaim = ncl_reclaim,
203 .vop_setattr = nfs_setattr,
204 .vop_write = nfsfifo_write,
205 };
206
207 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
208 struct componentname *cnp, struct vattr *vap);
209 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
210 int namelen, struct ucred *cred, struct thread *td);
211 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp,
212 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp,
213 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td);
214 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp,
215 struct componentname *scnp, struct sillyrename *sp);
216
217 /*
218 * Global variables
219 */
220 #define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1))
221
222 SYSCTL_DECL(_vfs_nfs);
223
224 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
225 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
226 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
227
228 static int nfs_prime_access_cache = 0;
229 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
230 &nfs_prime_access_cache, 0,
231 "Prime NFS ACCESS cache when fetching attributes");
232
233 static int newnfs_commit_on_close = 0;
234 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW,
235 &newnfs_commit_on_close, 0, "write+commit on close, else only write");
236
237 static int nfs_clean_pages_on_close = 1;
238 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
239 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
240
241 int newnfs_directio_enable = 0;
242 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
243 &newnfs_directio_enable, 0, "Enable NFS directio");
244
245 int nfs_keep_dirty_on_error;
246 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW,
247 &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned");
248
249 /*
250 * This sysctl allows other processes to mmap a file that has been opened
251 * O_DIRECT by a process. In general, having processes mmap the file while
252 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow
253 * this by default to prevent DoS attacks - to prevent a malicious user from
254 * opening up files O_DIRECT preventing other users from mmap'ing these
255 * files. "Protected" environments where stricter consistency guarantees are
256 * required can disable this knob. The process that opened the file O_DIRECT
257 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
258 * meaningful.
259 */
260 int newnfs_directio_allow_mmap = 1;
261 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
262 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
263
264 #if 0
265 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD,
266 &newnfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
267
268 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD,
269 &newnfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
270 #endif
271
272 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \
273 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \
274 | NFSACCESS_DELETE | NFSACCESS_LOOKUP)
275
276 /*
277 * SMP Locking Note :
278 * The list of locks after the description of the lock is the ordering
279 * of other locks acquired with the lock held.
280 * np->n_mtx : Protects the fields in the nfsnode.
281 VM Object Lock
282 VI_MTX (acquired indirectly)
283 * nmp->nm_mtx : Protects the fields in the nfsmount.
284 rep->r_mtx
285 * ncl_iod_mutex : Global lock, protects shared nfsiod state.
286 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
287 nmp->nm_mtx
288 rep->r_mtx
289 * rep->r_mtx : Protects the fields in an nfsreq.
290 */
291
292 static int
293 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td,
294 struct ucred *cred, u_int32_t *retmode)
295 {
296 int error = 0, attrflag, i, lrupos;
297 u_int32_t rmode;
298 struct nfsnode *np = VTONFS(vp);
299 struct nfsvattr nfsva;
300
301 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag,
302 &rmode, NULL);
303 if (attrflag)
304 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
305 if (!error) {
306 lrupos = 0;
307 mtx_lock(&np->n_mtx);
308 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
309 if (np->n_accesscache[i].uid == cred->cr_uid) {
310 np->n_accesscache[i].mode = rmode;
311 np->n_accesscache[i].stamp = time_second;
312 break;
313 }
314 if (i > 0 && np->n_accesscache[i].stamp <
315 np->n_accesscache[lrupos].stamp)
316 lrupos = i;
317 }
318 if (i == NFS_ACCESSCACHESIZE) {
319 np->n_accesscache[lrupos].uid = cred->cr_uid;
320 np->n_accesscache[lrupos].mode = rmode;
321 np->n_accesscache[lrupos].stamp = time_second;
322 }
323 mtx_unlock(&np->n_mtx);
324 if (retmode != NULL)
325 *retmode = rmode;
326 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0);
327 } else if (NFS_ISV4(vp)) {
328 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
329 }
330 #ifdef KDTRACE_HOOKS
331 if (error != 0)
332 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0,
333 error);
334 #endif
335 return (error);
336 }
337
338 /*
339 * nfs access vnode op.
340 * For nfs version 2, just return ok. File accesses may fail later.
341 * For nfs version 3, use the access rpc to check accessibility. If file modes
342 * are changed on the server, accesses might still fail later.
343 */
344 static int
345 nfs_access(struct vop_access_args *ap)
346 {
347 struct vnode *vp = ap->a_vp;
348 int error = 0, i, gotahit;
349 u_int32_t mode, wmode, rmode;
350 int v34 = NFS_ISV34(vp);
351 struct nfsnode *np = VTONFS(vp);
352
353 /*
354 * Disallow write attempts on filesystems mounted read-only;
355 * unless the file is a socket, fifo, or a block or character
356 * device resident on the filesystem.
357 */
358 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS |
359 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL |
360 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) {
361 switch (vp->v_type) {
362 case VREG:
363 case VDIR:
364 case VLNK:
365 return (EROFS);
366 default:
367 break;
368 }
369 }
370 /*
371 * For nfs v3 or v4, check to see if we have done this recently, and if
372 * so return our cached result instead of making an ACCESS call.
373 * If not, do an access rpc, otherwise you are stuck emulating
374 * ufs_access() locally using the vattr. This may not be correct,
375 * since the server may apply other access criteria such as
376 * client uid-->server uid mapping that we do not know about.
377 */
378 if (v34) {
379 if (ap->a_accmode & VREAD)
380 mode = NFSACCESS_READ;
381 else
382 mode = 0;
383 if (vp->v_type != VDIR) {
384 if (ap->a_accmode & VWRITE)
385 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
386 if (ap->a_accmode & VAPPEND)
387 mode |= NFSACCESS_EXTEND;
388 if (ap->a_accmode & VEXEC)
389 mode |= NFSACCESS_EXECUTE;
390 if (ap->a_accmode & VDELETE)
391 mode |= NFSACCESS_DELETE;
392 } else {
393 if (ap->a_accmode & VWRITE)
394 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
395 if (ap->a_accmode & VAPPEND)
396 mode |= NFSACCESS_EXTEND;
397 if (ap->a_accmode & VEXEC)
398 mode |= NFSACCESS_LOOKUP;
399 if (ap->a_accmode & VDELETE)
400 mode |= NFSACCESS_DELETE;
401 if (ap->a_accmode & VDELETE_CHILD)
402 mode |= NFSACCESS_MODIFY;
403 }
404 /* XXX safety belt, only make blanket request if caching */
405 if (nfsaccess_cache_timeout > 0) {
406 wmode = NFSACCESS_READ | NFSACCESS_MODIFY |
407 NFSACCESS_EXTEND | NFSACCESS_EXECUTE |
408 NFSACCESS_DELETE | NFSACCESS_LOOKUP;
409 } else {
410 wmode = mode;
411 }
412
413 /*
414 * Does our cached result allow us to give a definite yes to
415 * this request?
416 */
417 gotahit = 0;
418 mtx_lock(&np->n_mtx);
419 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
420 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
421 if (time_second < (np->n_accesscache[i].stamp
422 + nfsaccess_cache_timeout) &&
423 (np->n_accesscache[i].mode & mode) == mode) {
424 NFSINCRGLOBAL(newnfsstats.accesscache_hits);
425 gotahit = 1;
426 }
427 break;
428 }
429 }
430 mtx_unlock(&np->n_mtx);
431 #ifdef KDTRACE_HOOKS
432 if (gotahit != 0)
433 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp,
434 ap->a_cred->cr_uid, mode);
435 else
436 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp,
437 ap->a_cred->cr_uid, mode);
438 #endif
439 if (gotahit == 0) {
440 /*
441 * Either a no, or a don't know. Go to the wire.
442 */
443 NFSINCRGLOBAL(newnfsstats.accesscache_misses);
444 error = nfs34_access_otw(vp, wmode, ap->a_td,
445 ap->a_cred, &rmode);
446 if (!error &&
447 (rmode & mode) != mode)
448 error = EACCES;
449 }
450 return (error);
451 } else {
452 if ((error = nfsspec_access(ap)) != 0) {
453 return (error);
454 }
455 /*
456 * Attempt to prevent a mapped root from accessing a file
457 * which it shouldn't. We try to read a byte from the file
458 * if the user is root and the file is not zero length.
459 * After calling nfsspec_access, we should have the correct
460 * file size cached.
461 */
462 mtx_lock(&np->n_mtx);
463 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
464 && VTONFS(vp)->n_size > 0) {
465 struct iovec aiov;
466 struct uio auio;
467 char buf[1];
468
469 mtx_unlock(&np->n_mtx);
470 aiov.iov_base = buf;
471 aiov.iov_len = 1;
472 auio.uio_iov = &aiov;
473 auio.uio_iovcnt = 1;
474 auio.uio_offset = 0;
475 auio.uio_resid = 1;
476 auio.uio_segflg = UIO_SYSSPACE;
477 auio.uio_rw = UIO_READ;
478 auio.uio_td = ap->a_td;
479
480 if (vp->v_type == VREG)
481 error = ncl_readrpc(vp, &auio, ap->a_cred);
482 else if (vp->v_type == VDIR) {
483 char* bp;
484 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
485 aiov.iov_base = bp;
486 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
487 error = ncl_readdirrpc(vp, &auio, ap->a_cred,
488 ap->a_td);
489 free(bp, M_TEMP);
490 } else if (vp->v_type == VLNK)
491 error = ncl_readlinkrpc(vp, &auio, ap->a_cred);
492 else
493 error = EACCES;
494 } else
495 mtx_unlock(&np->n_mtx);
496 return (error);
497 }
498 }
499
500
501 /*
502 * nfs open vnode op
503 * Check to see if the type is ok
504 * and that deletion is not in progress.
505 * For paged in text files, you will need to flush the page cache
506 * if consistency is lost.
507 */
508 /* ARGSUSED */
509 static int
510 nfs_open(struct vop_open_args *ap)
511 {
512 struct vnode *vp = ap->a_vp;
513 struct nfsnode *np = VTONFS(vp);
514 struct vattr vattr;
515 int error;
516 int fmode = ap->a_mode;
517 struct ucred *cred;
518
519 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
520 return (EOPNOTSUPP);
521
522 /*
523 * For NFSv4, we need to do the Open Op before cache validation,
524 * so that we conform to RFC3530 Sec. 9.3.1.
525 */
526 if (NFS_ISV4(vp)) {
527 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);
528 if (error) {
529 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
530 (gid_t)0);
531 return (error);
532 }
533 }
534
535 /*
536 * Now, if this Open will be doing reading, re-validate/flush the
537 * cache, so that Close/Open coherency is maintained.
538 */
539 mtx_lock(&np->n_mtx);
540 if (np->n_flag & NMODIFIED) {
541 mtx_unlock(&np->n_mtx);
542 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
543 if (error == EINTR || error == EIO) {
544 if (NFS_ISV4(vp))
545 (void) nfsrpc_close(vp, 0, ap->a_td);
546 return (error);
547 }
548 mtx_lock(&np->n_mtx);
549 np->n_attrstamp = 0;
550 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
551 if (vp->v_type == VDIR)
552 np->n_direofoffset = 0;
553 mtx_unlock(&np->n_mtx);
554 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
555 if (error) {
556 if (NFS_ISV4(vp))
557 (void) nfsrpc_close(vp, 0, ap->a_td);
558 return (error);
559 }
560 mtx_lock(&np->n_mtx);
561 np->n_mtime = vattr.va_mtime;
562 if (NFS_ISV4(vp))
563 np->n_change = vattr.va_filerev;
564 } else {
565 mtx_unlock(&np->n_mtx);
566 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
567 if (error) {
568 if (NFS_ISV4(vp))
569 (void) nfsrpc_close(vp, 0, ap->a_td);
570 return (error);
571 }
572 mtx_lock(&np->n_mtx);
573 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) ||
574 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
575 if (vp->v_type == VDIR)
576 np->n_direofoffset = 0;
577 mtx_unlock(&np->n_mtx);
578 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
579 if (error == EINTR || error == EIO) {
580 if (NFS_ISV4(vp))
581 (void) nfsrpc_close(vp, 0, ap->a_td);
582 return (error);
583 }
584 mtx_lock(&np->n_mtx);
585 np->n_mtime = vattr.va_mtime;
586 if (NFS_ISV4(vp))
587 np->n_change = vattr.va_filerev;
588 }
589 }
590
591 /*
592 * If the object has >= 1 O_DIRECT active opens, we disable caching.
593 */
594 if (newnfs_directio_enable && (fmode & O_DIRECT) &&
595 (vp->v_type == VREG)) {
596 if (np->n_directio_opens == 0) {
597 mtx_unlock(&np->n_mtx);
598 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
599 if (error) {
600 if (NFS_ISV4(vp))
601 (void) nfsrpc_close(vp, 0, ap->a_td);
602 return (error);
603 }
604 mtx_lock(&np->n_mtx);
605 np->n_flag |= NNONCACHE;
606 }
607 np->n_directio_opens++;
608 }
609
610 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */
611 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0)
612 np->n_flag |= NWRITEOPENED;
613
614 /*
615 * If this is an open for writing, capture a reference to the
616 * credentials, so they can be used by ncl_putpages(). Using
617 * these write credentials is preferable to the credentials of
618 * whatever thread happens to be doing the VOP_PUTPAGES() since
619 * the write RPCs are less likely to fail with EACCES.
620 */
621 if ((fmode & FWRITE) != 0) {
622 cred = np->n_writecred;
623 np->n_writecred = crhold(ap->a_cred);
624 } else
625 cred = NULL;
626 mtx_unlock(&np->n_mtx);
627
628 if (cred != NULL)
629 crfree(cred);
630 vnode_create_vobject(vp, vattr.va_size, ap->a_td);
631 return (0);
632 }
633
634 /*
635 * nfs close vnode op
636 * What an NFS client should do upon close after writing is a debatable issue.
637 * Most NFS clients push delayed writes to the server upon close, basically for
638 * two reasons:
639 * 1 - So that any write errors may be reported back to the client process
640 * doing the close system call. By far the two most likely errors are
641 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
642 * 2 - To put a worst case upper bound on cache inconsistency between
643 * multiple clients for the file.
644 * There is also a consistency problem for Version 2 of the protocol w.r.t.
645 * not being able to tell if other clients are writing a file concurrently,
646 * since there is no way of knowing if the changed modify time in the reply
647 * is only due to the write for this client.
648 * (NFS Version 3 provides weak cache consistency data in the reply that
649 * should be sufficient to detect and handle this case.)
650 *
651 * The current code does the following:
652 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
653 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
654 * or commit them (this satisfies 1 and 2 except for the
655 * case where the server crashes after this close but
656 * before the commit RPC, which is felt to be "good
657 * enough". Changing the last argument to ncl_flush() to
658 * a 1 would force a commit operation, if it is felt a
659 * commit is necessary now.
660 * for NFS Version 4 - flush the dirty buffers and commit them, if
661 * nfscl_mustflush() says this is necessary.
662 * It is necessary if there is no write delegation held,
663 * in order to satisfy open/close coherency.
664 * If the file isn't cached on local stable storage,
665 * it may be necessary in order to detect "out of space"
666 * errors from the server, if the write delegation
667 * issued by the server doesn't allow the file to grow.
668 */
669 /* ARGSUSED */
670 static int
671 nfs_close(struct vop_close_args *ap)
672 {
673 struct vnode *vp = ap->a_vp;
674 struct nfsnode *np = VTONFS(vp);
675 struct nfsvattr nfsva;
676 struct ucred *cred;
677 int error = 0, ret, localcred = 0;
678 int fmode = ap->a_fflag;
679
680 if ((vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF))
681 return (0);
682 /*
683 * During shutdown, a_cred isn't valid, so just use root.
684 */
685 if (ap->a_cred == NOCRED) {
686 cred = newnfs_getcred();
687 localcred = 1;
688 } else {
689 cred = ap->a_cred;
690 }
691 if (vp->v_type == VREG) {
692 /*
693 * Examine and clean dirty pages, regardless of NMODIFIED.
694 * This closes a major hole in close-to-open consistency.
695 * We want to push out all dirty pages (and buffers) on
696 * close, regardless of whether they were dirtied by
697 * mmap'ed writes or via write().
698 */
699 if (nfs_clean_pages_on_close && vp->v_object) {
700 VM_OBJECT_WLOCK(vp->v_object);
701 vm_object_page_clean(vp->v_object, 0, 0, 0);
702 VM_OBJECT_WUNLOCK(vp->v_object);
703 }
704 mtx_lock(&np->n_mtx);
705 if (np->n_flag & NMODIFIED) {
706 mtx_unlock(&np->n_mtx);
707 if (NFS_ISV3(vp)) {
708 /*
709 * Under NFSv3 we have dirty buffers to dispose of. We
710 * must flush them to the NFS server. We have the option
711 * of waiting all the way through the commit rpc or just
712 * waiting for the initial write. The default is to only
713 * wait through the initial write so the data is in the
714 * server's cache, which is roughly similar to the state
715 * a standard disk subsystem leaves the file in on close().
716 *
717 * We cannot clear the NMODIFIED bit in np->n_flag due to
718 * potential races with other processes, and certainly
719 * cannot clear it if we don't commit.
720 * These races occur when there is no longer the old
721 * traditional vnode locking implemented for Vnode Ops.
722 */
723 int cm = newnfs_commit_on_close ? 1 : 0;
724 error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td, cm, 0);
725 /* np->n_flag &= ~NMODIFIED; */
726 } else if (NFS_ISV4(vp)) {
727 if (nfscl_mustflush(vp) != 0) {
728 int cm = newnfs_commit_on_close ? 1 : 0;
729 error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td,
730 cm, 0);
731 /*
732 * as above w.r.t races when clearing
733 * NMODIFIED.
734 * np->n_flag &= ~NMODIFIED;
735 */
736 }
737 } else
738 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
739 mtx_lock(&np->n_mtx);
740 }
741 /*
742 * Invalidate the attribute cache in all cases.
743 * An open is going to fetch fresh attrs any way, other procs
744 * on this node that have file open will be forced to do an
745 * otw attr fetch, but this is safe.
746 * --> A user found that their RPC count dropped by 20% when
747 * this was commented out and I can't see any requirement
748 * for it, so I've disabled it when negative lookups are
749 * enabled. (What does this have to do with negative lookup
750 * caching? Well nothing, except it was reported by the
751 * same user that needed negative lookup caching and I wanted
752 * there to be a way to disable it to see if it
753 * is the cause of some caching/coherency issue that might
754 * crop up.)
755 */
756 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) {
757 np->n_attrstamp = 0;
758 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
759 }
760 if (np->n_flag & NWRITEERR) {
761 np->n_flag &= ~NWRITEERR;
762 error = np->n_error;
763 }
764 mtx_unlock(&np->n_mtx);
765 }
766
767 if (NFS_ISV4(vp)) {
768 /*
769 * Get attributes so "change" is up to date.
770 */
771 if (error == 0 && nfscl_mustflush(vp) != 0 &&
772 vp->v_type == VREG &&
773 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) {
774 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
775 NULL);
776 if (!ret) {
777 np->n_change = nfsva.na_filerev;
778 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
779 NULL, 0, 0);
780 }
781 }
782
783 /*
784 * and do the close.
785 */
786 ret = nfsrpc_close(vp, 0, ap->a_td);
787 if (!error && ret)
788 error = ret;
789 if (error)
790 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
791 (gid_t)0);
792 }
793 if (newnfs_directio_enable)
794 KASSERT((np->n_directio_asyncwr == 0),
795 ("nfs_close: dirty unflushed (%d) directio buffers\n",
796 np->n_directio_asyncwr));
797 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
798 mtx_lock(&np->n_mtx);
799 KASSERT((np->n_directio_opens > 0),
800 ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
801 np->n_directio_opens--;
802 if (np->n_directio_opens == 0)
803 np->n_flag &= ~NNONCACHE;
804 mtx_unlock(&np->n_mtx);
805 }
806 if (localcred)
807 NFSFREECRED(cred);
808 return (error);
809 }
810
811 /*
812 * nfs getattr call from vfs.
813 */
814 static int
815 nfs_getattr(struct vop_getattr_args *ap)
816 {
817 struct vnode *vp = ap->a_vp;
818 struct thread *td = curthread; /* XXX */
819 struct nfsnode *np = VTONFS(vp);
820 int error = 0;
821 struct nfsvattr nfsva;
822 struct vattr *vap = ap->a_vap;
823 struct vattr vattr;
824
825 /*
826 * Update local times for special files.
827 */
828 mtx_lock(&np->n_mtx);
829 if (np->n_flag & (NACC | NUPD))
830 np->n_flag |= NCHG;
831 mtx_unlock(&np->n_mtx);
832 /*
833 * First look in the cache.
834 */
835 if (ncl_getattrcache(vp, &vattr) == 0) {
836 vap->va_type = vattr.va_type;
837 vap->va_mode = vattr.va_mode;
838 vap->va_nlink = vattr.va_nlink;
839 vap->va_uid = vattr.va_uid;
840 vap->va_gid = vattr.va_gid;
841 vap->va_fsid = vattr.va_fsid;
842 vap->va_fileid = vattr.va_fileid;
843 vap->va_size = vattr.va_size;
844 vap->va_blocksize = vattr.va_blocksize;
845 vap->va_atime = vattr.va_atime;
846 vap->va_mtime = vattr.va_mtime;
847 vap->va_ctime = vattr.va_ctime;
848 vap->va_gen = vattr.va_gen;
849 vap->va_flags = vattr.va_flags;
850 vap->va_rdev = vattr.va_rdev;
851 vap->va_bytes = vattr.va_bytes;
852 vap->va_filerev = vattr.va_filerev;
853 /*
854 * Get the local modify time for the case of a write
855 * delegation.
856 */
857 nfscl_deleggetmodtime(vp, &vap->va_mtime);
858 return (0);
859 }
860
861 if (NFS_ISV34(vp) && nfs_prime_access_cache &&
862 nfsaccess_cache_timeout > 0) {
863 NFSINCRGLOBAL(newnfsstats.accesscache_misses);
864 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
865 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
866 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
867 return (0);
868 }
869 }
870 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
871 if (!error)
872 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0);
873 if (!error) {
874 /*
875 * Get the local modify time for the case of a write
876 * delegation.
877 */
878 nfscl_deleggetmodtime(vp, &vap->va_mtime);
879 } else if (NFS_ISV4(vp)) {
880 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
881 }
882 return (error);
883 }
884
885 /*
886 * nfs setattr call.
887 */
888 static int
889 nfs_setattr(struct vop_setattr_args *ap)
890 {
891 struct vnode *vp = ap->a_vp;
892 struct nfsnode *np = VTONFS(vp);
893 struct thread *td = curthread; /* XXX */
894 struct vattr *vap = ap->a_vap;
895 int error = 0;
896 u_quad_t tsize;
897
898 #ifndef nolint
899 tsize = (u_quad_t)0;
900 #endif
901
902 /*
903 * Setting of flags and marking of atimes are not supported.
904 */
905 if (vap->va_flags != VNOVAL)
906 return (EOPNOTSUPP);
907
908 /*
909 * Disallow write attempts if the filesystem is mounted read-only.
910 */
911 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
912 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
913 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
914 (vp->v_mount->mnt_flag & MNT_RDONLY))
915 return (EROFS);
916 if (vap->va_size != VNOVAL) {
917 switch (vp->v_type) {
918 case VDIR:
919 return (EISDIR);
920 case VCHR:
921 case VBLK:
922 case VSOCK:
923 case VFIFO:
924 if (vap->va_mtime.tv_sec == VNOVAL &&
925 vap->va_atime.tv_sec == VNOVAL &&
926 vap->va_mode == (mode_t)VNOVAL &&
927 vap->va_uid == (uid_t)VNOVAL &&
928 vap->va_gid == (gid_t)VNOVAL)
929 return (0);
930 vap->va_size = VNOVAL;
931 break;
932 default:
933 /*
934 * Disallow write attempts if the filesystem is
935 * mounted read-only.
936 */
937 if (vp->v_mount->mnt_flag & MNT_RDONLY)
938 return (EROFS);
939 /*
940 * We run vnode_pager_setsize() early (why?),
941 * we must set np->n_size now to avoid vinvalbuf
942 * V_SAVE races that might setsize a lower
943 * value.
944 */
945 mtx_lock(&np->n_mtx);
946 tsize = np->n_size;
947 mtx_unlock(&np->n_mtx);
948 error = ncl_meta_setsize(vp, ap->a_cred, td,
949 vap->va_size);
950 mtx_lock(&np->n_mtx);
951 if (np->n_flag & NMODIFIED) {
952 tsize = np->n_size;
953 mtx_unlock(&np->n_mtx);
954 if (vap->va_size == 0)
955 error = ncl_vinvalbuf(vp, 0, td, 1);
956 else
957 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
958 if (error) {
959 vnode_pager_setsize(vp, tsize);
960 return (error);
961 }
962 /*
963 * Call nfscl_delegmodtime() to set the modify time
964 * locally, as required.
965 */
966 nfscl_delegmodtime(vp);
967 } else
968 mtx_unlock(&np->n_mtx);
969 /*
970 * np->n_size has already been set to vap->va_size
971 * in ncl_meta_setsize(). We must set it again since
972 * nfs_loadattrcache() could be called through
973 * ncl_meta_setsize() and could modify np->n_size.
974 */
975 mtx_lock(&np->n_mtx);
976 np->n_vattr.na_size = np->n_size = vap->va_size;
977 mtx_unlock(&np->n_mtx);
978 };
979 } else {
980 mtx_lock(&np->n_mtx);
981 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) &&
982 (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
983 mtx_unlock(&np->n_mtx);
984 if ((error = ncl_vinvalbuf(vp, V_SAVE, td, 1)) != 0 &&
985 (error == EINTR || error == EIO))
986 return (error);
987 } else
988 mtx_unlock(&np->n_mtx);
989 }
990 error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
991 if (error && vap->va_size != VNOVAL) {
992 mtx_lock(&np->n_mtx);
993 np->n_size = np->n_vattr.na_size = tsize;
994 vnode_pager_setsize(vp, tsize);
995 mtx_unlock(&np->n_mtx);
996 }
997 return (error);
998 }
999
1000 /*
1001 * Do an nfs setattr rpc.
1002 */
1003 static int
1004 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
1005 struct thread *td)
1006 {
1007 struct nfsnode *np = VTONFS(vp);
1008 int error, ret, attrflag, i;
1009 struct nfsvattr nfsva;
1010
1011 if (NFS_ISV34(vp)) {
1012 mtx_lock(&np->n_mtx);
1013 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
1014 np->n_accesscache[i].stamp = 0;
1015 np->n_flag |= NDELEGMOD;
1016 mtx_unlock(&np->n_mtx);
1017 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
1018 }
1019 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
1020 NULL);
1021 if (attrflag) {
1022 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1023 if (ret && !error)
1024 error = ret;
1025 }
1026 if (error && NFS_ISV4(vp))
1027 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
1028 return (error);
1029 }
1030
1031 /*
1032 * nfs lookup call, one step at a time...
1033 * First look in cache
1034 * If not found, unlock the directory nfsnode and do the rpc
1035 */
1036 static int
1037 nfs_lookup(struct vop_lookup_args *ap)
1038 {
1039 struct componentname *cnp = ap->a_cnp;
1040 struct vnode *dvp = ap->a_dvp;
1041 struct vnode **vpp = ap->a_vpp;
1042 struct mount *mp = dvp->v_mount;
1043 int flags = cnp->cn_flags;
1044 struct vnode *newvp;
1045 struct nfsmount *nmp;
1046 struct nfsnode *np, *newnp;
1047 int error = 0, attrflag, dattrflag, ltype, ncticks;
1048 struct thread *td = cnp->cn_thread;
1049 struct nfsfh *nfhp;
1050 struct nfsvattr dnfsva, nfsva;
1051 struct vattr vattr;
1052 struct timespec nctime;
1053
1054 *vpp = NULLVP;
1055 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
1056 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
1057 return (EROFS);
1058 if (dvp->v_type != VDIR)
1059 return (ENOTDIR);
1060 nmp = VFSTONFS(mp);
1061 np = VTONFS(dvp);
1062
1063 /* For NFSv4, wait until any remove is done. */
1064 mtx_lock(&np->n_mtx);
1065 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
1066 np->n_flag |= NREMOVEWANT;
1067 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
1068 }
1069 mtx_unlock(&np->n_mtx);
1070
1071 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0)
1072 return (error);
1073 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks);
1074 if (error > 0 && error != ENOENT)
1075 return (error);
1076 if (error == -1) {
1077 /*
1078 * Lookups of "." are special and always return the
1079 * current directory. cache_lookup() already handles
1080 * associated locking bookkeeping, etc.
1081 */
1082 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
1083 /* XXX: Is this really correct? */
1084 if (cnp->cn_nameiop != LOOKUP &&
1085 (flags & ISLASTCN))
1086 cnp->cn_flags |= SAVENAME;
1087 return (0);
1088 }
1089
1090 /*
1091 * We only accept a positive hit in the cache if the
1092 * change time of the file matches our cached copy.
1093 * Otherwise, we discard the cache entry and fallback
1094 * to doing a lookup RPC. We also only trust cache
1095 * entries for less than nm_nametimeo seconds.
1096 *
1097 * To better handle stale file handles and attributes,
1098 * clear the attribute cache of this node if it is a
1099 * leaf component, part of an open() call, and not
1100 * locally modified before fetching the attributes.
1101 * This should allow stale file handles to be detected
1102 * here where we can fall back to a LOOKUP RPC to
1103 * recover rather than having nfs_open() detect the
1104 * stale file handle and failing open(2) with ESTALE.
1105 */
1106 newvp = *vpp;
1107 newnp = VTONFS(newvp);
1108 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
1109 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1110 !(newnp->n_flag & NMODIFIED)) {
1111 mtx_lock(&newnp->n_mtx);
1112 newnp->n_attrstamp = 0;
1113 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1114 mtx_unlock(&newnp->n_mtx);
1115 }
1116 if (nfscl_nodeleg(newvp, 0) == 0 ||
1117 ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
1118 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
1119 timespeccmp(&vattr.va_ctime, &nctime, ==))) {
1120 NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
1121 if (cnp->cn_nameiop != LOOKUP &&
1122 (flags & ISLASTCN))
1123 cnp->cn_flags |= SAVENAME;
1124 return (0);
1125 }
1126 cache_purge(newvp);
1127 if (dvp != newvp)
1128 vput(newvp);
1129 else
1130 vrele(newvp);
1131 *vpp = NULLVP;
1132 } else if (error == ENOENT) {
1133 if (dvp->v_iflag & VI_DOOMED)
1134 return (ENOENT);
1135 /*
1136 * We only accept a negative hit in the cache if the
1137 * modification time of the parent directory matches
1138 * the cached copy in the name cache entry.
1139 * Otherwise, we discard all of the negative cache
1140 * entries for this directory. We also only trust
1141 * negative cache entries for up to nm_negnametimeo
1142 * seconds.
1143 */
1144 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
1145 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
1146 timespeccmp(&vattr.va_mtime, &nctime, ==)) {
1147 NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
1148 return (ENOENT);
1149 }
1150 cache_purge_negative(dvp);
1151 }
1152
1153 error = 0;
1154 newvp = NULLVP;
1155 NFSINCRGLOBAL(newnfsstats.lookupcache_misses);
1156 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1157 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1158 NULL);
1159 if (dattrflag)
1160 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1161 if (error) {
1162 if (newvp != NULLVP) {
1163 vput(newvp);
1164 *vpp = NULLVP;
1165 }
1166
1167 if (error != ENOENT) {
1168 if (NFS_ISV4(dvp))
1169 error = nfscl_maperr(td, error, (uid_t)0,
1170 (gid_t)0);
1171 return (error);
1172 }
1173
1174 /* The requested file was not found. */
1175 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
1176 (flags & ISLASTCN)) {
1177 /*
1178 * XXX: UFS does a full VOP_ACCESS(dvp,
1179 * VWRITE) here instead of just checking
1180 * MNT_RDONLY.
1181 */
1182 if (mp->mnt_flag & MNT_RDONLY)
1183 return (EROFS);
1184 cnp->cn_flags |= SAVENAME;
1185 return (EJUSTRETURN);
1186 }
1187
1188 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE &&
1189 dattrflag) {
1190 /*
1191 * Cache the modification time of the parent
1192 * directory from the post-op attributes in
1193 * the name cache entry. The negative cache
1194 * entry will be ignored once the directory
1195 * has changed. Don't bother adding the entry
1196 * if the directory has already changed.
1197 */
1198 mtx_lock(&np->n_mtx);
1199 if (timespeccmp(&np->n_vattr.na_mtime,
1200 &dnfsva.na_mtime, ==)) {
1201 mtx_unlock(&np->n_mtx);
1202 cache_enter_time(dvp, NULL, cnp,
1203 &dnfsva.na_mtime, NULL);
1204 } else
1205 mtx_unlock(&np->n_mtx);
1206 }
1207 return (ENOENT);
1208 }
1209
1210 /*
1211 * Handle RENAME case...
1212 */
1213 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
1214 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1215 FREE((caddr_t)nfhp, M_NFSFH);
1216 return (EISDIR);
1217 }
1218 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1219 LK_EXCLUSIVE);
1220 if (error)
1221 return (error);
1222 newvp = NFSTOV(np);
1223 if (attrflag)
1224 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1225 0, 1);
1226 *vpp = newvp;
1227 cnp->cn_flags |= SAVENAME;
1228 return (0);
1229 }
1230
1231 if (flags & ISDOTDOT) {
1232 ltype = NFSVOPISLOCKED(dvp);
1233 error = vfs_busy(mp, MBF_NOWAIT);
1234 if (error != 0) {
1235 vfs_ref(mp);
1236 NFSVOPUNLOCK(dvp, 0);
1237 error = vfs_busy(mp, 0);
1238 NFSVOPLOCK(dvp, ltype | LK_RETRY);
1239 vfs_rel(mp);
1240 if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
1241 vfs_unbusy(mp);
1242 error = ENOENT;
1243 }
1244 if (error != 0)
1245 return (error);
1246 }
1247 NFSVOPUNLOCK(dvp, 0);
1248 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1249 cnp->cn_lkflags);
1250 if (error == 0)
1251 newvp = NFSTOV(np);
1252 vfs_unbusy(mp);
1253 if (newvp != dvp)
1254 NFSVOPLOCK(dvp, ltype | LK_RETRY);
1255 if (dvp->v_iflag & VI_DOOMED) {
1256 if (error == 0) {
1257 if (newvp == dvp)
1258 vrele(newvp);
1259 else
1260 vput(newvp);
1261 }
1262 error = ENOENT;
1263 }
1264 if (error != 0)
1265 return (error);
1266 if (attrflag)
1267 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1268 0, 1);
1269 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1270 FREE((caddr_t)nfhp, M_NFSFH);
1271 VREF(dvp);
1272 newvp = dvp;
1273 if (attrflag)
1274 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1275 0, 1);
1276 } else {
1277 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1278 cnp->cn_lkflags);
1279 if (error)
1280 return (error);
1281 newvp = NFSTOV(np);
1282 if (attrflag)
1283 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1284 0, 1);
1285 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1286 !(np->n_flag & NMODIFIED)) {
1287 /*
1288 * Flush the attribute cache when opening a
1289 * leaf node to ensure that fresh attributes
1290 * are fetched in nfs_open() since we did not
1291 * fetch attributes from the LOOKUP reply.
1292 */
1293 mtx_lock(&np->n_mtx);
1294 np->n_attrstamp = 0;
1295 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1296 mtx_unlock(&np->n_mtx);
1297 }
1298 }
1299 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
1300 cnp->cn_flags |= SAVENAME;
1301 if ((cnp->cn_flags & MAKEENTRY) &&
1302 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
1303 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
1304 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
1305 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime);
1306 *vpp = newvp;
1307 return (0);
1308 }
1309
1310 /*
1311 * nfs read call.
1312 * Just call ncl_bioread() to do the work.
1313 */
1314 static int
1315 nfs_read(struct vop_read_args *ap)
1316 {
1317 struct vnode *vp = ap->a_vp;
1318
1319 switch (vp->v_type) {
1320 case VREG:
1321 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
1322 case VDIR:
1323 return (EISDIR);
1324 default:
1325 return (EOPNOTSUPP);
1326 }
1327 }
1328
1329 /*
1330 * nfs readlink call
1331 */
1332 static int
1333 nfs_readlink(struct vop_readlink_args *ap)
1334 {
1335 struct vnode *vp = ap->a_vp;
1336
1337 if (vp->v_type != VLNK)
1338 return (EINVAL);
1339 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
1340 }
1341
1342 /*
1343 * Do a readlink rpc.
1344 * Called by ncl_doio() from below the buffer cache.
1345 */
1346 int
1347 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1348 {
1349 int error, ret, attrflag;
1350 struct nfsvattr nfsva;
1351
1352 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
1353 &attrflag, NULL);
1354 if (attrflag) {
1355 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1356 if (ret && !error)
1357 error = ret;
1358 }
1359 if (error && NFS_ISV4(vp))
1360 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1361 return (error);
1362 }
1363
1364 /*
1365 * nfs read rpc call
1366 * Ditto above
1367 */
1368 int
1369 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1370 {
1371 int error, ret, attrflag;
1372 struct nfsvattr nfsva;
1373 struct nfsmount *nmp;
1374
1375 nmp = VFSTONFS(vnode_mount(vp));
1376 error = EIO;
1377 attrflag = 0;
1378 if (NFSHASPNFS(nmp))
1379 error = nfscl_doiods(vp, uiop, NULL, NULL,
1380 NFSV4OPEN_ACCESSREAD, cred, uiop->uio_td);
1381 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error);
1382 if (error != 0)
1383 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva,
1384 &attrflag, NULL);
1385 if (attrflag) {
1386 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1387 if (ret && !error)
1388 error = ret;
1389 }
1390 if (error && NFS_ISV4(vp))
1391 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1392 return (error);
1393 }
1394
1395 /*
1396 * nfs write call
1397 */
1398 int
1399 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
1400 int *iomode, int *must_commit, int called_from_strategy)
1401 {
1402 struct nfsvattr nfsva;
1403 int error, attrflag, ret;
1404 struct nfsmount *nmp;
1405
1406 nmp = VFSTONFS(vnode_mount(vp));
1407 error = EIO;
1408 attrflag = 0;
1409 if (NFSHASPNFS(nmp))
1410 error = nfscl_doiods(vp, uiop, iomode, must_commit,
1411 NFSV4OPEN_ACCESSWRITE, cred, uiop->uio_td);
1412 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error);
1413 if (error != 0)
1414 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
1415 uiop->uio_td, &nfsva, &attrflag, NULL,
1416 called_from_strategy);
1417 if (attrflag) {
1418 if (VTONFS(vp)->n_flag & ND_NFSV4)
1419 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1,
1420 1);
1421 else
1422 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
1423 1);
1424 if (ret && !error)
1425 error = ret;
1426 }
1427 if (DOINGASYNC(vp))
1428 *iomode = NFSWRITE_FILESYNC;
1429 if (error && NFS_ISV4(vp))
1430 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1431 return (error);
1432 }
1433
1434 /*
1435 * nfs mknod rpc
1436 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
1437 * mode set to specify the file type and the size field for rdev.
1438 */
1439 static int
1440 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
1441 struct vattr *vap)
1442 {
1443 struct nfsvattr nfsva, dnfsva;
1444 struct vnode *newvp = NULL;
1445 struct nfsnode *np = NULL, *dnp;
1446 struct nfsfh *nfhp;
1447 struct vattr vattr;
1448 int error = 0, attrflag, dattrflag;
1449 u_int32_t rdev;
1450
1451 if (vap->va_type == VCHR || vap->va_type == VBLK)
1452 rdev = vap->va_rdev;
1453 else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
1454 rdev = 0xffffffff;
1455 else
1456 return (EOPNOTSUPP);
1457 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1458 return (error);
1459 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
1460 rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva,
1461 &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
1462 if (!error) {
1463 if (!nfhp)
1464 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1465 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
1466 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1467 NULL);
1468 if (nfhp)
1469 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1470 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
1471 }
1472 if (dattrflag)
1473 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1474 if (!error) {
1475 newvp = NFSTOV(np);
1476 if (attrflag != 0) {
1477 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1478 0, 1);
1479 if (error != 0)
1480 vput(newvp);
1481 }
1482 }
1483 if (!error) {
1484 *vpp = newvp;
1485 } else if (NFS_ISV4(dvp)) {
1486 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
1487 vap->va_gid);
1488 }
1489 dnp = VTONFS(dvp);
1490 mtx_lock(&dnp->n_mtx);
1491 dnp->n_flag |= NMODIFIED;
1492 if (!dattrflag) {
1493 dnp->n_attrstamp = 0;
1494 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1495 }
1496 mtx_unlock(&dnp->n_mtx);
1497 return (error);
1498 }
1499
1500 /*
1501 * nfs mknod vop
1502 * just call nfs_mknodrpc() to do the work.
1503 */
1504 /* ARGSUSED */
1505 static int
1506 nfs_mknod(struct vop_mknod_args *ap)
1507 {
1508 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
1509 }
1510
1511 static struct mtx nfs_cverf_mtx;
1512 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex",
1513 MTX_DEF);
1514
1515 static nfsquad_t
1516 nfs_get_cverf(void)
1517 {
1518 static nfsquad_t cverf;
1519 nfsquad_t ret;
1520 static int cverf_initialized = 0;
1521
1522 mtx_lock(&nfs_cverf_mtx);
1523 if (cverf_initialized == 0) {
1524 cverf.lval[0] = arc4random();
1525 cverf.lval[1] = arc4random();
1526 cverf_initialized = 1;
1527 } else
1528 cverf.qval++;
1529 ret = cverf;
1530 mtx_unlock(&nfs_cverf_mtx);
1531
1532 return (ret);
1533 }
1534
1535 /*
1536 * nfs file create call
1537 */
1538 static int
1539 nfs_create(struct vop_create_args *ap)
1540 {
1541 struct vnode *dvp = ap->a_dvp;
1542 struct vattr *vap = ap->a_vap;
1543 struct componentname *cnp = ap->a_cnp;
1544 struct nfsnode *np = NULL, *dnp;
1545 struct vnode *newvp = NULL;
1546 struct nfsmount *nmp;
1547 struct nfsvattr dnfsva, nfsva;
1548 struct nfsfh *nfhp;
1549 nfsquad_t cverf;
1550 int error = 0, attrflag, dattrflag, fmode = 0;
1551 struct vattr vattr;
1552
1553 /*
1554 * Oops, not for me..
1555 */
1556 if (vap->va_type == VSOCK)
1557 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
1558
1559 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1560 return (error);
1561 if (vap->va_vaflags & VA_EXCLUSIVE)
1562 fmode |= O_EXCL;
1563 dnp = VTONFS(dvp);
1564 nmp = VFSTONFS(vnode_mount(dvp));
1565 again:
1566 /* For NFSv4, wait until any remove is done. */
1567 mtx_lock(&dnp->n_mtx);
1568 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
1569 dnp->n_flag |= NREMOVEWANT;
1570 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
1571 }
1572 mtx_unlock(&dnp->n_mtx);
1573
1574 cverf = nfs_get_cverf();
1575 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1576 vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva,
1577 &nfhp, &attrflag, &dattrflag, NULL);
1578 if (!error) {
1579 if (nfhp == NULL)
1580 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1581 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
1582 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1583 NULL);
1584 if (nfhp != NULL)
1585 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1586 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
1587 }
1588 if (dattrflag)
1589 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1590 if (!error) {
1591 newvp = NFSTOV(np);
1592 if (attrflag == 0)
1593 error = nfsrpc_getattr(newvp, cnp->cn_cred,
1594 cnp->cn_thread, &nfsva, NULL);
1595 if (error == 0)
1596 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1597 0, 1);
1598 }
1599 if (error) {
1600 if (newvp != NULL) {
1601 vput(newvp);
1602 newvp = NULL;
1603 }
1604 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
1605 error == NFSERR_NOTSUPP) {
1606 fmode &= ~O_EXCL;
1607 goto again;
1608 }
1609 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
1610 if (nfscl_checksattr(vap, &nfsva)) {
1611 /*
1612 * We are normally called with only a partially
1613 * initialized VAP. Since the NFSv3 spec says that
1614 * the server may use the file attributes to
1615 * store the verifier, the spec requires us to do a
1616 * SETATTR RPC. FreeBSD servers store the verifier in
1617 * atime, but we can't really assume that all servers
1618 * will so we ensure that our SETATTR sets both atime
1619 * and mtime.
1620 */
1621 if (vap->va_mtime.tv_sec == VNOVAL)
1622 vfs_timestamp(&vap->va_mtime);
1623 if (vap->va_atime.tv_sec == VNOVAL)
1624 vap->va_atime = vap->va_mtime;
1625 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
1626 cnp->cn_thread, &nfsva, &attrflag, NULL);
1627 if (error && (vap->va_uid != (uid_t)VNOVAL ||
1628 vap->va_gid != (gid_t)VNOVAL)) {
1629 /* try again without setting uid/gid */
1630 vap->va_uid = (uid_t)VNOVAL;
1631 vap->va_gid = (uid_t)VNOVAL;
1632 error = nfsrpc_setattr(newvp, vap, NULL,
1633 cnp->cn_cred, cnp->cn_thread, &nfsva,
1634 &attrflag, NULL);
1635 }
1636 if (attrflag)
1637 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
1638 NULL, 0, 1);
1639 if (error != 0)
1640 vput(newvp);
1641 }
1642 }
1643 if (!error) {
1644 if ((cnp->cn_flags & MAKEENTRY) && attrflag)
1645 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
1646 NULL);
1647 *ap->a_vpp = newvp;
1648 } else if (NFS_ISV4(dvp)) {
1649 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
1650 vap->va_gid);
1651 }
1652 mtx_lock(&dnp->n_mtx);
1653 dnp->n_flag |= NMODIFIED;
1654 if (!dattrflag) {
1655 dnp->n_attrstamp = 0;
1656 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1657 }
1658 mtx_unlock(&dnp->n_mtx);
1659 return (error);
1660 }
1661
1662 /*
1663 * nfs file remove call
1664 * To try and make nfs semantics closer to ufs semantics, a file that has
1665 * other processes using the vnode is renamed instead of removed and then
1666 * removed later on the last close.
1667 * - If v_usecount > 1
1668 * If a rename is not already in the works
1669 * call nfs_sillyrename() to set it up
1670 * else
1671 * do the remove rpc
1672 */
1673 static int
1674 nfs_remove(struct vop_remove_args *ap)
1675 {
1676 struct vnode *vp = ap->a_vp;
1677 struct vnode *dvp = ap->a_dvp;
1678 struct componentname *cnp = ap->a_cnp;
1679 struct nfsnode *np = VTONFS(vp);
1680 int error = 0;
1681 struct vattr vattr;
1682
1683 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
1684 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
1685 if (vp->v_type == VDIR)
1686 error = EPERM;
1687 else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
1688 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
1689 vattr.va_nlink > 1)) {
1690 /*
1691 * Purge the name cache so that the chance of a lookup for
1692 * the name succeeding while the remove is in progress is
1693 * minimized. Without node locking it can still happen, such
1694 * that an I/O op returns ESTALE, but since you get this if
1695 * another host removes the file..
1696 */
1697 cache_purge(vp);
1698 /*
1699 * throw away biocache buffers, mainly to avoid
1700 * unnecessary delayed writes later.
1701 */
1702 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1);
1703 /* Do the rpc */
1704 if (error != EINTR && error != EIO)
1705 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
1706 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
1707 /*
1708 * Kludge City: If the first reply to the remove rpc is lost..
1709 * the reply to the retransmitted request will be ENOENT
1710 * since the file was in fact removed
1711 * Therefore, we cheat and return success.
1712 */
1713 if (error == ENOENT)
1714 error = 0;
1715 } else if (!np->n_sillyrename)
1716 error = nfs_sillyrename(dvp, vp, cnp);
1717 mtx_lock(&np->n_mtx);
1718 np->n_attrstamp = 0;
1719 mtx_unlock(&np->n_mtx);
1720 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1721 return (error);
1722 }
1723
1724 /*
1725 * nfs file remove rpc called from nfs_inactive
1726 */
1727 int
1728 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
1729 {
1730 /*
1731 * Make sure that the directory vnode is still valid.
1732 * XXX we should lock sp->s_dvp here.
1733 */
1734 if (sp->s_dvp->v_type == VBAD)
1735 return (0);
1736 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
1737 sp->s_cred, NULL));
1738 }
1739
1740 /*
1741 * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
1742 */
1743 static int
1744 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
1745 int namelen, struct ucred *cred, struct thread *td)
1746 {
1747 struct nfsvattr dnfsva;
1748 struct nfsnode *dnp = VTONFS(dvp);
1749 int error = 0, dattrflag;
1750
1751 mtx_lock(&dnp->n_mtx);
1752 dnp->n_flag |= NREMOVEINPROG;
1753 mtx_unlock(&dnp->n_mtx);
1754 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
1755 &dattrflag, NULL);
1756 mtx_lock(&dnp->n_mtx);
1757 if ((dnp->n_flag & NREMOVEWANT)) {
1758 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
1759 mtx_unlock(&dnp->n_mtx);
1760 wakeup((caddr_t)dnp);
1761 } else {
1762 dnp->n_flag &= ~NREMOVEINPROG;
1763 mtx_unlock(&dnp->n_mtx);
1764 }
1765 if (dattrflag)
1766 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1767 mtx_lock(&dnp->n_mtx);
1768 dnp->n_flag |= NMODIFIED;
1769 if (!dattrflag) {
1770 dnp->n_attrstamp = 0;
1771 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1772 }
1773 mtx_unlock(&dnp->n_mtx);
1774 if (error && NFS_ISV4(dvp))
1775 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1776 return (error);
1777 }
1778
1779 /*
1780 * nfs file rename call
1781 */
1782 static int
1783 nfs_rename(struct vop_rename_args *ap)
1784 {
1785 struct vnode *fvp = ap->a_fvp;
1786 struct vnode *tvp = ap->a_tvp;
1787 struct vnode *fdvp = ap->a_fdvp;
1788 struct vnode *tdvp = ap->a_tdvp;
1789 struct componentname *tcnp = ap->a_tcnp;
1790 struct componentname *fcnp = ap->a_fcnp;
1791 struct nfsnode *fnp = VTONFS(ap->a_fvp);
1792 struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
1793 struct nfsv4node *newv4 = NULL;
1794 int error;
1795
1796 KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
1797 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
1798 /* Check for cross-device rename */
1799 if ((fvp->v_mount != tdvp->v_mount) ||
1800 (tvp && (fvp->v_mount != tvp->v_mount))) {
1801 error = EXDEV;
1802 goto out;
1803 }
1804
1805 if (fvp == tvp) {
1806 ncl_printf("nfs_rename: fvp == tvp (can't happen)\n");
1807 error = 0;
1808 goto out;
1809 }
1810 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
1811 goto out;
1812
1813 /*
1814 * We have to flush B_DELWRI data prior to renaming
1815 * the file. If we don't, the delayed-write buffers
1816 * can be flushed out later after the file has gone stale
1817 * under NFSV3. NFSV2 does not have this problem because
1818 * ( as far as I can tell ) it flushes dirty buffers more
1819 * often.
1820 *
1821 * Skip the rename operation if the fsync fails, this can happen
1822 * due to the server's volume being full, when we pushed out data
1823 * that was written back to our cache earlier. Not checking for
1824 * this condition can result in potential (silent) data loss.
1825 */
1826 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
1827 NFSVOPUNLOCK(fvp, 0);
1828 if (!error && tvp)
1829 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
1830 if (error)
1831 goto out;
1832
1833 /*
1834 * If the tvp exists and is in use, sillyrename it before doing the
1835 * rename of the new file over it.
1836 * XXX Can't sillyrename a directory.
1837 */
1838 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
1839 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
1840 vput(tvp);
1841 tvp = NULL;
1842 }
1843
1844 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
1845 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
1846 tcnp->cn_thread);
1847
1848 if (error == 0 && NFS_ISV4(tdvp)) {
1849 /*
1850 * For NFSv4, check to see if it is the same name and
1851 * replace the name, if it is different.
1852 */
1853 MALLOC(newv4, struct nfsv4node *,
1854 sizeof (struct nfsv4node) +
1855 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
1856 M_NFSV4NODE, M_WAITOK);
1857 mtx_lock(&tdnp->n_mtx);
1858 mtx_lock(&fnp->n_mtx);
1859 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
1860 (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
1861 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
1862 tcnp->cn_namelen) ||
1863 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
1864 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
1865 tdnp->n_fhp->nfh_len))) {
1866 #ifdef notdef
1867 { char nnn[100]; int nnnl;
1868 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
1869 bcopy(tcnp->cn_nameptr, nnn, nnnl);
1870 nnn[nnnl] = '\0';
1871 printf("ren replace=%s\n",nnn);
1872 }
1873 #endif
1874 FREE((caddr_t)fnp->n_v4, M_NFSV4NODE);
1875 fnp->n_v4 = newv4;
1876 newv4 = NULL;
1877 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
1878 fnp->n_v4->n4_namelen = tcnp->cn_namelen;
1879 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
1880 tdnp->n_fhp->nfh_len);
1881 NFSBCOPY(tcnp->cn_nameptr,
1882 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
1883 }
1884 mtx_unlock(&tdnp->n_mtx);
1885 mtx_unlock(&fnp->n_mtx);
1886 if (newv4 != NULL)
1887 FREE((caddr_t)newv4, M_NFSV4NODE);
1888 }
1889
1890 if (fvp->v_type == VDIR) {
1891 if (tvp != NULL && tvp->v_type == VDIR)
1892 cache_purge(tdvp);
1893 cache_purge(fdvp);
1894 }
1895
1896 out:
1897 if (tdvp == tvp)
1898 vrele(tdvp);
1899 else
1900 vput(tdvp);
1901 if (tvp)
1902 vput(tvp);
1903 vrele(fdvp);
1904 vrele(fvp);
1905 /*
1906 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
1907 */
1908 if (error == ENOENT)
1909 error = 0;
1910 return (error);
1911 }
1912
1913 /*
1914 * nfs file rename rpc called from nfs_remove() above
1915 */
1916 static int
1917 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
1918 struct sillyrename *sp)
1919 {
1920
1921 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
1922 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
1923 scnp->cn_thread));
1924 }
1925
1926 /*
1927 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
1928 */
1929 static int
1930 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
1931 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
1932 int tnamelen, struct ucred *cred, struct thread *td)
1933 {
1934 struct nfsvattr fnfsva, tnfsva;
1935 struct nfsnode *fdnp = VTONFS(fdvp);
1936 struct nfsnode *tdnp = VTONFS(tdvp);
1937 int error = 0, fattrflag, tattrflag;
1938
1939 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
1940 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
1941 &tattrflag, NULL, NULL);
1942 mtx_lock(&fdnp->n_mtx);
1943 fdnp->n_flag |= NMODIFIED;
1944 if (fattrflag != 0) {
1945 mtx_unlock(&fdnp->n_mtx);
1946 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1);
1947 } else {
1948 fdnp->n_attrstamp = 0;
1949 mtx_unlock(&fdnp->n_mtx);
1950 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
1951 }
1952 mtx_lock(&tdnp->n_mtx);
1953 tdnp->n_flag |= NMODIFIED;
1954 if (tattrflag != 0) {
1955 mtx_unlock(&tdnp->n_mtx);
1956 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1);
1957 } else {
1958 tdnp->n_attrstamp = 0;
1959 mtx_unlock(&tdnp->n_mtx);
1960 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
1961 }
1962 if (error && NFS_ISV4(fdvp))
1963 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1964 return (error);
1965 }
1966
1967 /*
1968 * nfs hard link create call
1969 */
1970 static int
1971 nfs_link(struct vop_link_args *ap)
1972 {
1973 struct vnode *vp = ap->a_vp;
1974 struct vnode *tdvp = ap->a_tdvp;
1975 struct componentname *cnp = ap->a_cnp;
1976 struct nfsnode *np, *tdnp;
1977 struct nfsvattr nfsva, dnfsva;
1978 int error = 0, attrflag, dattrflag;
1979
1980 /*
1981 * Push all writes to the server, so that the attribute cache
1982 * doesn't get "out of sync" with the server.
1983 * XXX There should be a better way!
1984 */
1985 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
1986
1987 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
1988 cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag,
1989 &dattrflag, NULL);
1990 tdnp = VTONFS(tdvp);
1991 mtx_lock(&tdnp->n_mtx);
1992 tdnp->n_flag |= NMODIFIED;
1993 if (dattrflag != 0) {
1994 mtx_unlock(&tdnp->n_mtx);
1995 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1);
1996 } else {
1997 tdnp->n_attrstamp = 0;
1998 mtx_unlock(&tdnp->n_mtx);
1999 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
2000 }
2001 if (attrflag)
2002 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2003 else {
2004 np = VTONFS(vp);
2005 mtx_lock(&np->n_mtx);
2006 np->n_attrstamp = 0;
2007 mtx_unlock(&np->n_mtx);
2008 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
2009 }
2010 /*
2011 * If negative lookup caching is enabled, I might as well
2012 * add an entry for this node. Not necessary for correctness,
2013 * but if negative caching is enabled, then the system
2014 * must care about lookup caching hit rate, so...
2015 */
2016 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
2017 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2018 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL);
2019 }
2020 if (error && NFS_ISV4(vp))
2021 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
2022 (gid_t)0);
2023 return (error);
2024 }
2025
2026 /*
2027 * nfs symbolic link create call
2028 */
2029 static int
2030 nfs_symlink(struct vop_symlink_args *ap)
2031 {
2032 struct vnode *dvp = ap->a_dvp;
2033 struct vattr *vap = ap->a_vap;
2034 struct componentname *cnp = ap->a_cnp;
2035 struct nfsvattr nfsva, dnfsva;
2036 struct nfsfh *nfhp;
2037 struct nfsnode *np = NULL, *dnp;
2038 struct vnode *newvp = NULL;
2039 int error = 0, attrflag, dattrflag, ret;
2040
2041 vap->va_type = VLNK;
2042 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2043 ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva,
2044 &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
2045 if (nfhp) {
2046 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
2047 &np, NULL, LK_EXCLUSIVE);
2048 if (!ret)
2049 newvp = NFSTOV(np);
2050 else if (!error)
2051 error = ret;
2052 }
2053 if (newvp != NULL) {
2054 if (attrflag)
2055 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
2056 0, 1);
2057 } else if (!error) {
2058 /*
2059 * If we do not have an error and we could not extract the
2060 * newvp from the response due to the request being NFSv2, we
2061 * have to do a lookup in order to obtain a newvp to return.
2062 */
2063 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2064 cnp->cn_cred, cnp->cn_thread, &np);
2065 if (!error)
2066 newvp = NFSTOV(np);
2067 }
2068 if (error) {
2069 if (newvp)
2070 vput(newvp);
2071 if (NFS_ISV4(dvp))
2072 error = nfscl_maperr(cnp->cn_thread, error,
2073 vap->va_uid, vap->va_gid);
2074 } else {
2075 *ap->a_vpp = newvp;
2076 }
2077
2078 dnp = VTONFS(dvp);
2079 mtx_lock(&dnp->n_mtx);
2080 dnp->n_flag |= NMODIFIED;
2081 if (dattrflag != 0) {
2082 mtx_unlock(&dnp->n_mtx);
2083 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2084 } else {
2085 dnp->n_attrstamp = 0;
2086 mtx_unlock(&dnp->n_mtx);
2087 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2088 }
2089 /*
2090 * If negative lookup caching is enabled, I might as well
2091 * add an entry for this node. Not necessary for correctness,
2092 * but if negative caching is enabled, then the system
2093 * must care about lookup caching hit rate, so...
2094 */
2095 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2096 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2097 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, NULL);
2098 }
2099 return (error);
2100 }
2101
2102 /*
2103 * nfs make dir call
2104 */
2105 static int
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 nfsnode *np = NULL, *dnp;
2112 struct vnode *newvp = NULL;
2113 struct vattr vattr;
2114 struct nfsfh *nfhp;
2115 struct nfsvattr nfsva, dnfsva;
2116 int error = 0, attrflag, dattrflag, ret;
2117
2118 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
2119 return (error);
2120 vap->va_type = VDIR;
2121 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2122 vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp,
2123 &attrflag, &dattrflag, NULL);
2124 dnp = VTONFS(dvp);
2125 mtx_lock(&dnp->n_mtx);
2126 dnp->n_flag |= NMODIFIED;
2127 if (dattrflag != 0) {
2128 mtx_unlock(&dnp->n_mtx);
2129 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2130 } else {
2131 dnp->n_attrstamp = 0;
2132 mtx_unlock(&dnp->n_mtx);
2133 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2134 }
2135 if (nfhp) {
2136 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
2137 &np, NULL, LK_EXCLUSIVE);
2138 if (!ret) {
2139 newvp = NFSTOV(np);
2140 if (attrflag)
2141 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
2142 NULL, 0, 1);
2143 } else if (!error)
2144 error = ret;
2145 }
2146 if (!error && newvp == NULL) {
2147 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2148 cnp->cn_cred, cnp->cn_thread, &np);
2149 if (!error) {
2150 newvp = NFSTOV(np);
2151 if (newvp->v_type != VDIR)
2152 error = EEXIST;
2153 }
2154 }
2155 if (error) {
2156 if (newvp)
2157 vput(newvp);
2158 if (NFS_ISV4(dvp))
2159 error = nfscl_maperr(cnp->cn_thread, error,
2160 vap->va_uid, vap->va_gid);
2161 } else {
2162 /*
2163 * If negative lookup caching is enabled, I might as well
2164 * add an entry for this node. Not necessary for correctness,
2165 * but if negative caching is enabled, then the system
2166 * must care about lookup caching hit rate, so...
2167 */
2168 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2169 (cnp->cn_flags & MAKEENTRY) &&
2170 attrflag != 0 && dattrflag != 0)
2171 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
2172 &dnfsva.na_ctime);
2173 *ap->a_vpp = newvp;
2174 }
2175 return (error);
2176 }
2177
2178 /*
2179 * nfs remove directory call
2180 */
2181 static int
2182 nfs_rmdir(struct vop_rmdir_args *ap)
2183 {
2184 struct vnode *vp = ap->a_vp;
2185 struct vnode *dvp = ap->a_dvp;
2186 struct componentname *cnp = ap->a_cnp;
2187 struct nfsnode *dnp;
2188 struct nfsvattr dnfsva;
2189 int error, dattrflag;
2190
2191 if (dvp == vp)
2192 return (EINVAL);
2193 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2194 cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL);
2195 dnp = VTONFS(dvp);
2196 mtx_lock(&dnp->n_mtx);
2197 dnp->n_flag |= NMODIFIED;
2198 if (dattrflag != 0) {
2199 mtx_unlock(&dnp->n_mtx);
2200 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2201 } else {
2202 dnp->n_attrstamp = 0;
2203 mtx_unlock(&dnp->n_mtx);
2204 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2205 }
2206
2207 cache_purge(dvp);
2208 cache_purge(vp);
2209 if (error && NFS_ISV4(dvp))
2210 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
2211 (gid_t)0);
2212 /*
2213 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
2214 */
2215 if (error == ENOENT)
2216 error = 0;
2217 return (error);
2218 }
2219
2220 /*
2221 * nfs readdir call
2222 */
2223 static int
2224 nfs_readdir(struct vop_readdir_args *ap)
2225 {
2226 struct vnode *vp = ap->a_vp;
2227 struct nfsnode *np = VTONFS(vp);
2228 struct uio *uio = ap->a_uio;
2229 ssize_t tresid;
2230 int error = 0;
2231 struct vattr vattr;
2232
2233 if (ap->a_eofflag != NULL)
2234 *ap->a_eofflag = 0;
2235 if (vp->v_type != VDIR)
2236 return(EPERM);
2237
2238 /*
2239 * First, check for hit on the EOF offset cache
2240 */
2241 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
2242 (np->n_flag & NMODIFIED) == 0) {
2243 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
2244 mtx_lock(&np->n_mtx);
2245 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
2246 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
2247 mtx_unlock(&np->n_mtx);
2248 NFSINCRGLOBAL(newnfsstats.direofcache_hits);
2249 if (ap->a_eofflag != NULL)
2250 *ap->a_eofflag = 1;
2251 return (0);
2252 } else
2253 mtx_unlock(&np->n_mtx);
2254 }
2255 }
2256
2257 /*
2258 * Call ncl_bioread() to do the real work.
2259 */
2260 tresid = uio->uio_resid;
2261 error = ncl_bioread(vp, uio, 0, ap->a_cred);
2262
2263 if (!error && uio->uio_resid == tresid) {
2264 NFSINCRGLOBAL(newnfsstats.direofcache_misses);
2265 if (ap->a_eofflag != NULL)
2266 *ap->a_eofflag = 1;
2267 }
2268 return (error);
2269 }
2270
2271 /*
2272 * Readdir rpc call.
2273 * Called from below the buffer cache by ncl_doio().
2274 */
2275 int
2276 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2277 struct thread *td)
2278 {
2279 struct nfsvattr nfsva;
2280 nfsuint64 *cookiep, cookie;
2281 struct nfsnode *dnp = VTONFS(vp);
2282 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2283 int error = 0, eof, attrflag;
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 ncl_dircookie_lock(dnp);
2294 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2295 if (cookiep) {
2296 cookie = *cookiep;
2297 ncl_dircookie_unlock(dnp);
2298 } else {
2299 ncl_dircookie_unlock(dnp);
2300 return (NFSERR_BAD_COOKIE);
2301 }
2302
2303 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2304 (void)ncl_fsinfo(nmp, vp, cred, td);
2305
2306 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
2307 &attrflag, &eof, NULL);
2308 if (attrflag)
2309 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2310
2311 if (!error) {
2312 /*
2313 * We are now either at the end of the directory or have filled
2314 * the block.
2315 */
2316 if (eof)
2317 dnp->n_direofoffset = uiop->uio_offset;
2318 else {
2319 if (uiop->uio_resid > 0)
2320 ncl_printf("EEK! readdirrpc resid > 0\n");
2321 ncl_dircookie_lock(dnp);
2322 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2323 *cookiep = cookie;
2324 ncl_dircookie_unlock(dnp);
2325 }
2326 } else if (NFS_ISV4(vp)) {
2327 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2328 }
2329 return (error);
2330 }
2331
2332 /*
2333 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
2334 */
2335 int
2336 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2337 struct thread *td)
2338 {
2339 struct nfsvattr nfsva;
2340 nfsuint64 *cookiep, cookie;
2341 struct nfsnode *dnp = VTONFS(vp);
2342 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2343 int error = 0, attrflag, eof;
2344
2345 KASSERT(uiop->uio_iovcnt == 1 &&
2346 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2347 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2348 ("nfs readdirplusrpc bad uio"));
2349
2350 /*
2351 * If there is no cookie, assume directory was stale.
2352 */
2353 ncl_dircookie_lock(dnp);
2354 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2355 if (cookiep) {
2356 cookie = *cookiep;
2357 ncl_dircookie_unlock(dnp);
2358 } else {
2359 ncl_dircookie_unlock(dnp);
2360 return (NFSERR_BAD_COOKIE);
2361 }
2362
2363 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2364 (void)ncl_fsinfo(nmp, vp, cred, td);
2365 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
2366 &attrflag, &eof, NULL);
2367 if (attrflag)
2368 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2369
2370 if (!error) {
2371 /*
2372 * We are now either at end of the directory or have filled the
2373 * the block.
2374 */
2375 if (eof)
2376 dnp->n_direofoffset = uiop->uio_offset;
2377 else {
2378 if (uiop->uio_resid > 0)
2379 ncl_printf("EEK! readdirplusrpc resid > 0\n");
2380 ncl_dircookie_lock(dnp);
2381 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2382 *cookiep = cookie;
2383 ncl_dircookie_unlock(dnp);
2384 }
2385 } else if (NFS_ISV4(vp)) {
2386 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2387 }
2388 return (error);
2389 }
2390
2391 /*
2392 * Silly rename. To make the NFS filesystem that is stateless look a little
2393 * more like the "ufs" a remove of an active vnode is translated to a rename
2394 * to a funny looking filename that is removed by nfs_inactive on the
2395 * nfsnode. There is the potential for another process on a different client
2396 * to create the same funny name between the nfs_lookitup() fails and the
2397 * nfs_rename() completes, but...
2398 */
2399 static int
2400 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
2401 {
2402 struct sillyrename *sp;
2403 struct nfsnode *np;
2404 int error;
2405 short pid;
2406 unsigned int lticks;
2407
2408 cache_purge(dvp);
2409 np = VTONFS(vp);
2410 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
2411 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
2412 M_NEWNFSREQ, M_WAITOK);
2413 sp->s_cred = crhold(cnp->cn_cred);
2414 sp->s_dvp = dvp;
2415 VREF(dvp);
2416
2417 /*
2418 * Fudge together a funny name.
2419 * Changing the format of the funny name to accomodate more
2420 * sillynames per directory.
2421 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is
2422 * CPU ticks since boot.
2423 */
2424 pid = cnp->cn_thread->td_proc->p_pid;
2425 lticks = (unsigned int)ticks;
2426 for ( ; ; ) {
2427 sp->s_namlen = sprintf(sp->s_name,
2428 ".nfs.%08x.%04x4.4", lticks,
2429 pid);
2430 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2431 cnp->cn_thread, NULL))
2432 break;
2433 lticks++;
2434 }
2435 error = nfs_renameit(dvp, vp, cnp, sp);
2436 if (error)
2437 goto bad;
2438 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2439 cnp->cn_thread, &np);
2440 np->n_sillyrename = sp;
2441 return (0);
2442 bad:
2443 vrele(sp->s_dvp);
2444 crfree(sp->s_cred);
2445 free((caddr_t)sp, M_NEWNFSREQ);
2446 return (error);
2447 }
2448
2449 /*
2450 * Look up a file name and optionally either update the file handle or
2451 * allocate an nfsnode, depending on the value of npp.
2452 * npp == NULL --> just do the lookup
2453 * *npp == NULL --> allocate a new nfsnode and make sure attributes are
2454 * handled too
2455 * *npp != NULL --> update the file handle in the vnode
2456 */
2457 static int
2458 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
2459 struct thread *td, struct nfsnode **npp)
2460 {
2461 struct vnode *newvp = NULL, *vp;
2462 struct nfsnode *np, *dnp = VTONFS(dvp);
2463 struct nfsfh *nfhp, *onfhp;
2464 struct nfsvattr nfsva, dnfsva;
2465 struct componentname cn;
2466 int error = 0, attrflag, dattrflag;
2467 u_int hash;
2468
2469 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
2470 &nfhp, &attrflag, &dattrflag, NULL);
2471 if (dattrflag)
2472 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2473 if (npp && !error) {
2474 if (*npp != NULL) {
2475 np = *npp;
2476 vp = NFSTOV(np);
2477 /*
2478 * For NFSv4, check to see if it is the same name and
2479 * replace the name, if it is different.
2480 */
2481 if (np->n_v4 != NULL && nfsva.na_type == VREG &&
2482 (np->n_v4->n4_namelen != len ||
2483 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
2484 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
2485 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2486 dnp->n_fhp->nfh_len))) {
2487 #ifdef notdef
2488 { char nnn[100]; int nnnl;
2489 nnnl = (len < 100) ? len : 99;
2490 bcopy(name, nnn, nnnl);
2491 nnn[nnnl] = '\0';
2492 printf("replace=%s\n",nnn);
2493 }
2494 #endif
2495 FREE((caddr_t)np->n_v4, M_NFSV4NODE);
2496 MALLOC(np->n_v4, struct nfsv4node *,
2497 sizeof (struct nfsv4node) +
2498 dnp->n_fhp->nfh_len + len - 1,
2499 M_NFSV4NODE, M_WAITOK);
2500 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
2501 np->n_v4->n4_namelen = len;
2502 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2503 dnp->n_fhp->nfh_len);
2504 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
2505 }
2506 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
2507 FNV1_32_INIT);
2508 onfhp = np->n_fhp;
2509 /*
2510 * Rehash node for new file handle.
2511 */
2512 vfs_hash_rehash(vp, hash);
2513 np->n_fhp = nfhp;
2514 if (onfhp != NULL)
2515 FREE((caddr_t)onfhp, M_NFSFH);
2516 newvp = NFSTOV(np);
2517 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
2518 FREE((caddr_t)nfhp, M_NFSFH);
2519 VREF(dvp);
2520 newvp = dvp;
2521 } else {
2522 cn.cn_nameptr = name;
2523 cn.cn_namelen = len;
2524 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
2525 &np, NULL, LK_EXCLUSIVE);
2526 if (error)
2527 return (error);
2528 newvp = NFSTOV(np);
2529 }
2530 if (!attrflag && *npp == NULL) {
2531 if (newvp == dvp)
2532 vrele(newvp);
2533 else
2534 vput(newvp);
2535 return (ENOENT);
2536 }
2537 if (attrflag)
2538 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
2539 0, 1);
2540 }
2541 if (npp && *npp == NULL) {
2542 if (error) {
2543 if (newvp) {
2544 if (newvp == dvp)
2545 vrele(newvp);
2546 else
2547 vput(newvp);
2548 }
2549 } else
2550 *npp = np;
2551 }
2552 if (error && NFS_ISV4(dvp))
2553 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2554 return (error);
2555 }
2556
2557 /*
2558 * Nfs Version 3 and 4 commit rpc
2559 */
2560 int
2561 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
2562 struct thread *td)
2563 {
2564 struct nfsvattr nfsva;
2565 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2566 int error, attrflag;
2567
2568 mtx_lock(&nmp->nm_mtx);
2569 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
2570 mtx_unlock(&nmp->nm_mtx);
2571 return (0);
2572 }
2573 mtx_unlock(&nmp->nm_mtx);
2574 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva,
2575 &attrflag, NULL);
2576 if (attrflag != 0)
2577 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL,
2578 0, 1);
2579 if (error != 0 && NFS_ISV4(vp))
2580 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2581 return (error);
2582 }
2583
2584 /*
2585 * Strategy routine.
2586 * For async requests when nfsiod(s) are running, queue the request by
2587 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
2588 * request.
2589 */
2590 static int
2591 nfs_strategy(struct vop_strategy_args *ap)
2592 {
2593 struct buf *bp = ap->a_bp;
2594 struct ucred *cr;
2595
2596 KASSERT(!(bp->b_flags & B_DONE),
2597 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
2598 BUF_ASSERT_HELD(bp);
2599
2600 if (bp->b_iocmd == BIO_READ)
2601 cr = bp->b_rcred;
2602 else
2603 cr = bp->b_wcred;
2604
2605 /*
2606 * If the op is asynchronous and an i/o daemon is waiting
2607 * queue the request, wake it up and wait for completion
2608 * otherwise just do it ourselves.
2609 */
2610 if ((bp->b_flags & B_ASYNC) == 0 ||
2611 ncl_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
2612 (void) ncl_doio(ap->a_vp, bp, cr, curthread, 1);
2613 return (0);
2614 }
2615
2616 /*
2617 * fsync vnode op. Just call ncl_flush() with commit == 1.
2618 */
2619 /* ARGSUSED */
2620 static int
2621 nfs_fsync(struct vop_fsync_args *ap)
2622 {
2623
2624 if (ap->a_vp->v_type != VREG) {
2625 /*
2626 * For NFS, metadata is changed synchronously on the server,
2627 * so there is nothing to flush. Also, ncl_flush() clears
2628 * the NMODIFIED flag and that shouldn't be done here for
2629 * directories.
2630 */
2631 return (0);
2632 }
2633 return (ncl_flush(ap->a_vp, ap->a_waitfor, NULL, ap->a_td, 1, 0));
2634 }
2635
2636 /*
2637 * Flush all the blocks associated with a vnode.
2638 * Walk through the buffer pool and push any dirty pages
2639 * associated with the vnode.
2640 * If the called_from_renewthread argument is TRUE, it has been called
2641 * from the NFSv4 renew thread and, as such, cannot block indefinitely
2642 * waiting for a buffer write to complete.
2643 */
2644 int
2645 ncl_flush(struct vnode *vp, int waitfor, struct ucred *cred, struct thread *td,
2646 int commit, int called_from_renewthread)
2647 {
2648 struct nfsnode *np = VTONFS(vp);
2649 struct buf *bp;
2650 int i;
2651 struct buf *nbp;
2652 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2653 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
2654 int passone = 1, trycnt = 0;
2655 u_quad_t off, endoff, toff;
2656 struct ucred* wcred = NULL;
2657 struct buf **bvec = NULL;
2658 struct bufobj *bo;
2659 #ifndef NFS_COMMITBVECSIZ
2660 #define NFS_COMMITBVECSIZ 20
2661 #endif
2662 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
2663 int bvecsize = 0, bveccount;
2664
2665 if (called_from_renewthread != 0)
2666 slptimeo = hz;
2667 if (nmp->nm_flag & NFSMNT_INT)
2668 slpflag = PCATCH;
2669 if (!commit)
2670 passone = 0;
2671 bo = &vp->v_bufobj;
2672 /*
2673 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
2674 * server, but has not been committed to stable storage on the server
2675 * yet. On the first pass, the byte range is worked out and the commit
2676 * rpc is done. On the second pass, ncl_writebp() is called to do the
2677 * job.
2678 */
2679 again:
2680 off = (u_quad_t)-1;
2681 endoff = 0;
2682 bvecpos = 0;
2683 if (NFS_ISV34(vp) && commit) {
2684 if (bvec != NULL && bvec != bvec_on_stack)
2685 free(bvec, M_TEMP);
2686 /*
2687 * Count up how many buffers waiting for a commit.
2688 */
2689 bveccount = 0;
2690 BO_LOCK(bo);
2691 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2692 if (!BUF_ISLOCKED(bp) &&
2693 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
2694 == (B_DELWRI | B_NEEDCOMMIT))
2695 bveccount++;
2696 }
2697 /*
2698 * Allocate space to remember the list of bufs to commit. It is
2699 * important to use M_NOWAIT here to avoid a race with nfs_write.
2700 * If we can't get memory (for whatever reason), we will end up
2701 * committing the buffers one-by-one in the loop below.
2702 */
2703 if (bveccount > NFS_COMMITBVECSIZ) {
2704 /*
2705 * Release the vnode interlock to avoid a lock
2706 * order reversal.
2707 */
2708 BO_UNLOCK(bo);
2709 bvec = (struct buf **)
2710 malloc(bveccount * sizeof(struct buf *),
2711 M_TEMP, M_NOWAIT);
2712 BO_LOCK(bo);
2713 if (bvec == NULL) {
2714 bvec = bvec_on_stack;
2715 bvecsize = NFS_COMMITBVECSIZ;
2716 } else
2717 bvecsize = bveccount;
2718 } else {
2719 bvec = bvec_on_stack;
2720 bvecsize = NFS_COMMITBVECSIZ;
2721 }
2722 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2723 if (bvecpos >= bvecsize)
2724 break;
2725 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2726 nbp = TAILQ_NEXT(bp, b_bobufs);
2727 continue;
2728 }
2729 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
2730 (B_DELWRI | B_NEEDCOMMIT)) {
2731 BUF_UNLOCK(bp);
2732 nbp = TAILQ_NEXT(bp, b_bobufs);
2733 continue;
2734 }
2735 BO_UNLOCK(bo);
2736 bremfree(bp);
2737 /*
2738 * Work out if all buffers are using the same cred
2739 * so we can deal with them all with one commit.
2740 *
2741 * NOTE: we are not clearing B_DONE here, so we have
2742 * to do it later on in this routine if we intend to
2743 * initiate I/O on the bp.
2744 *
2745 * Note: to avoid loopback deadlocks, we do not
2746 * assign b_runningbufspace.
2747 */
2748 if (wcred == NULL)
2749 wcred = bp->b_wcred;
2750 else if (wcred != bp->b_wcred)
2751 wcred = NOCRED;
2752 vfs_busy_pages(bp, 1);
2753
2754 BO_LOCK(bo);
2755 /*
2756 * bp is protected by being locked, but nbp is not
2757 * and vfs_busy_pages() may sleep. We have to
2758 * recalculate nbp.
2759 */
2760 nbp = TAILQ_NEXT(bp, b_bobufs);
2761
2762 /*
2763 * A list of these buffers is kept so that the
2764 * second loop knows which buffers have actually
2765 * been committed. This is necessary, since there
2766 * may be a race between the commit rpc and new
2767 * uncommitted writes on the file.
2768 */
2769 bvec[bvecpos++] = bp;
2770 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
2771 bp->b_dirtyoff;
2772 if (toff < off)
2773 off = toff;
2774 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
2775 if (toff > endoff)
2776 endoff = toff;
2777 }
2778 BO_UNLOCK(bo);
2779 }
2780 if (bvecpos > 0) {
2781 /*
2782 * Commit data on the server, as required.
2783 * If all bufs are using the same wcred, then use that with
2784 * one call for all of them, otherwise commit each one
2785 * separately.
2786 */
2787 if (wcred != NOCRED)
2788 retv = ncl_commit(vp, off, (int)(endoff - off),
2789 wcred, td);
2790 else {
2791 retv = 0;
2792 for (i = 0; i < bvecpos; i++) {
2793 off_t off, size;
2794 bp = bvec[i];
2795 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
2796 bp->b_dirtyoff;
2797 size = (u_quad_t)(bp->b_dirtyend
2798 - bp->b_dirtyoff);
2799 retv = ncl_commit(vp, off, (int)size,
2800 bp->b_wcred, td);
2801 if (retv) break;
2802 }
2803 }
2804
2805 if (retv == NFSERR_STALEWRITEVERF)
2806 ncl_clearcommit(vp->v_mount);
2807
2808 /*
2809 * Now, either mark the blocks I/O done or mark the
2810 * blocks dirty, depending on whether the commit
2811 * succeeded.
2812 */
2813 for (i = 0; i < bvecpos; i++) {
2814 bp = bvec[i];
2815 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
2816 if (retv) {
2817 /*
2818 * Error, leave B_DELWRI intact
2819 */
2820 vfs_unbusy_pages(bp);
2821 brelse(bp);
2822 } else {
2823 /*
2824 * Success, remove B_DELWRI ( bundirty() ).
2825 *
2826 * b_dirtyoff/b_dirtyend seem to be NFS
2827 * specific. We should probably move that
2828 * into bundirty(). XXX
2829 */
2830 bufobj_wref(bo);
2831 bp->b_flags |= B_ASYNC;
2832 bundirty(bp);
2833 bp->b_flags &= ~B_DONE;
2834 bp->b_ioflags &= ~BIO_ERROR;
2835 bp->b_dirtyoff = bp->b_dirtyend = 0;
2836 bufdone(bp);
2837 }
2838 }
2839 }
2840
2841 /*
2842 * Start/do any write(s) that are required.
2843 */
2844 loop:
2845 BO_LOCK(bo);
2846 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2847 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2848 if (waitfor != MNT_WAIT || passone)
2849 continue;
2850
2851 error = BUF_TIMELOCK(bp,
2852 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
2853 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo);
2854 if (error == 0) {
2855 BUF_UNLOCK(bp);
2856 goto loop;
2857 }
2858 if (error == ENOLCK) {
2859 error = 0;
2860 goto loop;
2861 }
2862 if (called_from_renewthread != 0) {
2863 /*
2864 * Return EIO so the flush will be retried
2865 * later.
2866 */
2867 error = EIO;
2868 goto done;
2869 }
2870 if (newnfs_sigintr(nmp, td)) {
2871 error = EINTR;
2872 goto done;
2873 }
2874 if (slpflag == PCATCH) {
2875 slpflag = 0;
2876 slptimeo = 2 * hz;
2877 }
2878 goto loop;
2879 }
2880 if ((bp->b_flags & B_DELWRI) == 0)
2881 panic("nfs_fsync: not dirty");
2882 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
2883 BUF_UNLOCK(bp);
2884 continue;
2885 }
2886 BO_UNLOCK(bo);
2887 bremfree(bp);
2888 if (passone || !commit)
2889 bp->b_flags |= B_ASYNC;
2890 else
2891 bp->b_flags |= B_ASYNC;
2892 bwrite(bp);
2893 if (newnfs_sigintr(nmp, td)) {
2894 error = EINTR;
2895 goto done;
2896 }
2897 goto loop;
2898 }
2899 if (passone) {
2900 passone = 0;
2901 BO_UNLOCK(bo);
2902 goto again;
2903 }
2904 if (waitfor == MNT_WAIT) {
2905 while (bo->bo_numoutput) {
2906 error = bufobj_wwait(bo, slpflag, slptimeo);
2907 if (error) {
2908 BO_UNLOCK(bo);
2909 if (called_from_renewthread != 0) {
2910 /*
2911 * Return EIO so that the flush will be
2912 * retried later.
2913 */
2914 error = EIO;
2915 goto done;
2916 }
2917 error = newnfs_sigintr(nmp, td);
2918 if (error)
2919 goto done;
2920 if (slpflag == PCATCH) {
2921 slpflag = 0;
2922 slptimeo = 2 * hz;
2923 }
2924 BO_LOCK(bo);
2925 }
2926 }
2927 if (bo->bo_dirty.bv_cnt != 0 && commit) {
2928 BO_UNLOCK(bo);
2929 goto loop;
2930 }
2931 /*
2932 * Wait for all the async IO requests to drain
2933 */
2934 BO_UNLOCK(bo);
2935 mtx_lock(&np->n_mtx);
2936 while (np->n_directio_asyncwr > 0) {
2937 np->n_flag |= NFSYNCWAIT;
2938 error = newnfs_msleep(td, &np->n_directio_asyncwr,
2939 &np->n_mtx, slpflag | (PRIBIO + 1),
2940 "nfsfsync", 0);
2941 if (error) {
2942 if (newnfs_sigintr(nmp, td)) {
2943 mtx_unlock(&np->n_mtx);
2944 error = EINTR;
2945 goto done;
2946 }
2947 }
2948 }
2949 mtx_unlock(&np->n_mtx);
2950 } else
2951 BO_UNLOCK(bo);
2952 if (NFSHASPNFS(nmp)) {
2953 nfscl_layoutcommit(vp, td);
2954 /*
2955 * Invalidate the attribute cache, since writes to a DS
2956 * won't update the size attribute.
2957 */
2958 mtx_lock(&np->n_mtx);
2959 np->n_attrstamp = 0;
2960 } else
2961 mtx_lock(&np->n_mtx);
2962 if (np->n_flag & NWRITEERR) {
2963 error = np->n_error;
2964 np->n_flag &= ~NWRITEERR;
2965 }
2966 if (commit && bo->bo_dirty.bv_cnt == 0 &&
2967 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
2968 np->n_flag &= ~NMODIFIED;
2969 mtx_unlock(&np->n_mtx);
2970 done:
2971 if (bvec != NULL && bvec != bvec_on_stack)
2972 free(bvec, M_TEMP);
2973 if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
2974 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 ||
2975 np->n_directio_asyncwr != 0) && trycnt++ < 5) {
2976 /* try, try again... */
2977 passone = 1;
2978 wcred = NULL;
2979 bvec = NULL;
2980 bvecsize = 0;
2981 printf("try%d\n", trycnt);
2982 goto again;
2983 }
2984 return (error);
2985 }
2986
2987 /*
2988 * NFS advisory byte-level locks.
2989 */
2990 static int
2991 nfs_advlock(struct vop_advlock_args *ap)
2992 {
2993 struct vnode *vp = ap->a_vp;
2994 struct ucred *cred;
2995 struct nfsnode *np = VTONFS(ap->a_vp);
2996 struct proc *p = (struct proc *)ap->a_id;
2997 struct thread *td = curthread; /* XXX */
2998 struct vattr va;
2999 int ret, error = EOPNOTSUPP;
3000 u_quad_t size;
3001
3002 if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
3003 if (vp->v_type != VREG)
3004 return (EINVAL);
3005 if ((ap->a_flags & F_POSIX) != 0)
3006 cred = p->p_ucred;
3007 else
3008 cred = td->td_ucred;
3009 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
3010 if (vp->v_iflag & VI_DOOMED) {
3011 NFSVOPUNLOCK(vp, 0);
3012 return (EBADF);
3013 }
3014
3015 /*
3016 * If this is unlocking a write locked region, flush and
3017 * commit them before unlocking. This is required by
3018 * RFC3530 Sec. 9.3.2.
3019 */
3020 if (ap->a_op == F_UNLCK &&
3021 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
3022 ap->a_flags))
3023 (void) ncl_flush(vp, MNT_WAIT, cred, td, 1, 0);
3024
3025 /*
3026 * Loop around doing the lock op, while a blocking lock
3027 * must wait for the lock op to succeed.
3028 */
3029 do {
3030 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
3031 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
3032 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3033 ap->a_op == F_SETLK) {
3034 NFSVOPUNLOCK(vp, 0);
3035 error = nfs_catnap(PZERO | PCATCH, ret,
3036 "ncladvl");
3037 if (error)
3038 return (EINTR);
3039 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
3040 if (vp->v_iflag & VI_DOOMED) {
3041 NFSVOPUNLOCK(vp, 0);
3042 return (EBADF);
3043 }
3044 }
3045 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3046 ap->a_op == F_SETLK);
3047 if (ret == NFSERR_DENIED) {
3048 NFSVOPUNLOCK(vp, 0);
3049 return (EAGAIN);
3050 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
3051 NFSVOPUNLOCK(vp, 0);
3052 return (ret);
3053 } else if (ret != 0) {
3054 NFSVOPUNLOCK(vp, 0);
3055 return (EACCES);
3056 }
3057
3058 /*
3059 * Now, if we just got a lock, invalidate data in the buffer
3060 * cache, as required, so that the coherency conforms with
3061 * RFC3530 Sec. 9.3.2.
3062 */
3063 if (ap->a_op == F_SETLK) {
3064 if ((np->n_flag & NMODIFIED) == 0) {
3065 np->n_attrstamp = 0;
3066 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3067 ret = VOP_GETATTR(vp, &va, cred);
3068 }
3069 if ((np->n_flag & NMODIFIED) || ret ||
3070 np->n_change != va.va_filerev) {
3071 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
3072 np->n_attrstamp = 0;
3073 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3074 ret = VOP_GETATTR(vp, &va, cred);
3075 if (!ret) {
3076 np->n_mtime = va.va_mtime;
3077 np->n_change = va.va_filerev;
3078 }
3079 }
3080 /* Mark that a file lock has been acquired. */
3081 mtx_lock(&np->n_mtx);
3082 np->n_flag |= NHASBEENLOCKED;
3083 mtx_unlock(&np->n_mtx);
3084 }
3085 NFSVOPUNLOCK(vp, 0);
3086 return (0);
3087 } else if (!NFS_ISV4(vp)) {
3088 error = NFSVOPLOCK(vp, LK_SHARED);
3089 if (error)
3090 return (error);
3091 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
3092 size = VTONFS(vp)->n_size;
3093 NFSVOPUNLOCK(vp, 0);
3094 error = lf_advlock(ap, &(vp->v_lockf), size);
3095 } else {
3096 if (nfs_advlock_p != NULL)
3097 error = nfs_advlock_p(ap);
3098 else {
3099 NFSVOPUNLOCK(vp, 0);
3100 error = ENOLCK;
3101 }
3102 }
3103 if (error == 0 && ap->a_op == F_SETLK) {
3104 /* Mark that a file lock has been acquired. */
3105 mtx_lock(&np->n_mtx);
3106 np->n_flag |= NHASBEENLOCKED;
3107 mtx_unlock(&np->n_mtx);
3108 }
3109 }
3110 return (error);
3111 }
3112
3113 /*
3114 * NFS advisory byte-level locks.
3115 */
3116 static int
3117 nfs_advlockasync(struct vop_advlockasync_args *ap)
3118 {
3119 struct vnode *vp = ap->a_vp;
3120 u_quad_t size;
3121 int error;
3122
3123 if (NFS_ISV4(vp))
3124 return (EOPNOTSUPP);
3125 error = NFSVOPLOCK(vp, LK_SHARED);
3126 if (error)
3127 return (error);
3128 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
3129 size = VTONFS(vp)->n_size;
3130 NFSVOPUNLOCK(vp, 0);
3131 error = lf_advlockasync(ap, &(vp->v_lockf), size);
3132 } else {
3133 NFSVOPUNLOCK(vp, 0);
3134 error = EOPNOTSUPP;
3135 }
3136 return (error);
3137 }
3138
3139 /*
3140 * Print out the contents of an nfsnode.
3141 */
3142 static int
3143 nfs_print(struct vop_print_args *ap)
3144 {
3145 struct vnode *vp = ap->a_vp;
3146 struct nfsnode *np = VTONFS(vp);
3147
3148 ncl_printf("\tfileid %ld fsid 0x%x",
3149 np->n_vattr.na_fileid, np->n_vattr.na_fsid);
3150 if (vp->v_type == VFIFO)
3151 fifo_printinfo(vp);
3152 printf("\n");
3153 return (0);
3154 }
3155
3156 /*
3157 * This is the "real" nfs::bwrite(struct buf*).
3158 * We set B_CACHE if this is a VMIO buffer.
3159 */
3160 int
3161 ncl_writebp(struct buf *bp, int force __unused, struct thread *td)
3162 {
3163 int s;
3164 int oldflags = bp->b_flags;
3165 #if 0
3166 int retv = 1;
3167 off_t off;
3168 #endif
3169
3170 BUF_ASSERT_HELD(bp);
3171
3172 if (bp->b_flags & B_INVAL) {
3173 brelse(bp);
3174 return(0);
3175 }
3176
3177 bp->b_flags |= B_CACHE;
3178
3179 /*
3180 * Undirty the bp. We will redirty it later if the I/O fails.
3181 */
3182
3183 s = splbio();
3184 bundirty(bp);
3185 bp->b_flags &= ~B_DONE;
3186 bp->b_ioflags &= ~BIO_ERROR;
3187 bp->b_iocmd = BIO_WRITE;
3188
3189 bufobj_wref(bp->b_bufobj);
3190 curthread->td_ru.ru_oublock++;
3191 splx(s);
3192
3193 /*
3194 * Note: to avoid loopback deadlocks, we do not
3195 * assign b_runningbufspace.
3196 */
3197 vfs_busy_pages(bp, 1);
3198
3199 BUF_KERNPROC(bp);
3200 bp->b_iooffset = dbtob(bp->b_blkno);
3201 bstrategy(bp);
3202
3203 if( (oldflags & B_ASYNC) == 0) {
3204 int rtval = bufwait(bp);
3205
3206 if (oldflags & B_DELWRI) {
3207 s = splbio();
3208 reassignbuf(bp);
3209 splx(s);
3210 }
3211 brelse(bp);
3212 return (rtval);
3213 }
3214
3215 return (0);
3216 }
3217
3218 /*
3219 * nfs special file access vnode op.
3220 * Essentially just get vattr and then imitate iaccess() since the device is
3221 * local to the client.
3222 */
3223 static int
3224 nfsspec_access(struct vop_access_args *ap)
3225 {
3226 struct vattr *vap;
3227 struct ucred *cred = ap->a_cred;
3228 struct vnode *vp = ap->a_vp;
3229 accmode_t accmode = ap->a_accmode;
3230 struct vattr vattr;
3231 int error;
3232
3233 /*
3234 * Disallow write attempts on filesystems mounted read-only;
3235 * unless the file is a socket, fifo, or a block or character
3236 * device resident on the filesystem.
3237 */
3238 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
3239 switch (vp->v_type) {
3240 case VREG:
3241 case VDIR:
3242 case VLNK:
3243 return (EROFS);
3244 default:
3245 break;
3246 }
3247 }
3248 vap = &vattr;
3249 error = VOP_GETATTR(vp, vap, cred);
3250 if (error)
3251 goto out;
3252 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
3253 accmode, cred, NULL);
3254 out:
3255 return error;
3256 }
3257
3258 /*
3259 * Read wrapper for fifos.
3260 */
3261 static int
3262 nfsfifo_read(struct vop_read_args *ap)
3263 {
3264 struct nfsnode *np = VTONFS(ap->a_vp);
3265 int error;
3266
3267 /*
3268 * Set access flag.
3269 */
3270 mtx_lock(&np->n_mtx);
3271 np->n_flag |= NACC;
3272 vfs_timestamp(&np->n_atim);
3273 mtx_unlock(&np->n_mtx);
3274 error = fifo_specops.vop_read(ap);
3275 return error;
3276 }
3277
3278 /*
3279 * Write wrapper for fifos.
3280 */
3281 static int
3282 nfsfifo_write(struct vop_write_args *ap)
3283 {
3284 struct nfsnode *np = VTONFS(ap->a_vp);
3285
3286 /*
3287 * Set update flag.
3288 */
3289 mtx_lock(&np->n_mtx);
3290 np->n_flag |= NUPD;
3291 vfs_timestamp(&np->n_mtim);
3292 mtx_unlock(&np->n_mtx);
3293 return(fifo_specops.vop_write(ap));
3294 }
3295
3296 /*
3297 * Close wrapper for fifos.
3298 *
3299 * Update the times on the nfsnode then do fifo close.
3300 */
3301 static int
3302 nfsfifo_close(struct vop_close_args *ap)
3303 {
3304 struct vnode *vp = ap->a_vp;
3305 struct nfsnode *np = VTONFS(vp);
3306 struct vattr vattr;
3307 struct timespec ts;
3308
3309 mtx_lock(&np->n_mtx);
3310 if (np->n_flag & (NACC | NUPD)) {
3311 vfs_timestamp(&ts);
3312 if (np->n_flag & NACC)
3313 np->n_atim = ts;
3314 if (np->n_flag & NUPD)
3315 np->n_mtim = ts;
3316 np->n_flag |= NCHG;
3317 if (vrefcnt(vp) == 1 &&
3318 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
3319 VATTR_NULL(&vattr);
3320 if (np->n_flag & NACC)
3321 vattr.va_atime = np->n_atim;
3322 if (np->n_flag & NUPD)
3323 vattr.va_mtime = np->n_mtim;
3324 mtx_unlock(&np->n_mtx);
3325 (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
3326 goto out;
3327 }
3328 }
3329 mtx_unlock(&np->n_mtx);
3330 out:
3331 return (fifo_specops.vop_close(ap));
3332 }
3333
3334 /*
3335 * Just call ncl_writebp() with the force argument set to 1.
3336 *
3337 * NOTE: B_DONE may or may not be set in a_bp on call.
3338 */
3339 static int
3340 nfs_bwrite(struct buf *bp)
3341 {
3342
3343 return (ncl_writebp(bp, 1, curthread));
3344 }
3345
3346 struct buf_ops buf_ops_newnfs = {
3347 .bop_name = "buf_ops_nfs",
3348 .bop_write = nfs_bwrite,
3349 .bop_strategy = bufstrategy,
3350 .bop_sync = bufsync,
3351 .bop_bdflush = bufbdflush,
3352 };
3353
3354 /*
3355 * Cloned from vop_stdlock(), and then the ugly hack added.
3356 */
3357 static int
3358 nfs_lock1(struct vop_lock1_args *ap)
3359 {
3360 struct vnode *vp = ap->a_vp;
3361 int error = 0;
3362
3363 /*
3364 * Since vfs_hash_get() calls vget() and it will no longer work
3365 * for FreeBSD8 with flags == 0, I can only think of this horrible
3366 * hack to work around it. I call vfs_hash_get() with LK_EXCLOTHER
3367 * and then handle it here. All I want for this case is a v_usecount
3368 * on the vnode to use for recovery, while another thread might
3369 * hold a lock on the vnode. I have the other threads blocked, so
3370 * there isn't any race problem.
3371 */
3372 if ((ap->a_flags & LK_TYPE_MASK) == LK_EXCLOTHER) {
3373 if ((ap->a_flags & LK_INTERLOCK) == 0)
3374 panic("ncllock1");
3375 if ((vp->v_iflag & VI_DOOMED))
3376 error = ENOENT;
3377 VI_UNLOCK(vp);
3378 return (error);
3379 }
3380 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp),
3381 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file,
3382 ap->a_line));
3383 }
3384
3385 static int
3386 nfs_getacl(struct vop_getacl_args *ap)
3387 {
3388 int error;
3389
3390 if (ap->a_type != ACL_TYPE_NFS4)
3391 return (EOPNOTSUPP);
3392 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
3393 NULL);
3394 if (error > NFSERR_STALE) {
3395 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3396 error = EPERM;
3397 }
3398 return (error);
3399 }
3400
3401 static int
3402 nfs_setacl(struct vop_setacl_args *ap)
3403 {
3404 int error;
3405
3406 if (ap->a_type != ACL_TYPE_NFS4)
3407 return (EOPNOTSUPP);
3408 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
3409 NULL);
3410 if (error > NFSERR_STALE) {
3411 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3412 error = EPERM;
3413 }
3414 return (error);
3415 }
3416
3417 /*
3418 * Return POSIX pathconf information applicable to nfs filesystems.
3419 */
3420 static int
3421 nfs_pathconf(struct vop_pathconf_args *ap)
3422 {
3423 struct nfsv3_pathconf pc;
3424 struct nfsvattr nfsva;
3425 struct vnode *vp = ap->a_vp;
3426 struct thread *td = curthread;
3427 int attrflag, error;
3428
3429 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX ||
3430 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
3431 ap->a_name == _PC_NO_TRUNC)) ||
3432 (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) {
3433 /*
3434 * Since only the above 4 a_names are returned by the NFSv3
3435 * Pathconf RPC, there is no point in doing it for others.
3436 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can
3437 * be used for _PC_NFS4_ACL as well.
3438 */
3439 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva,
3440 &attrflag, NULL);
3441 if (attrflag != 0)
3442 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
3443 1);
3444 if (error != 0)
3445 return (error);
3446 } else {
3447 /*
3448 * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
3449 * just fake them.
3450 */
3451 pc.pc_linkmax = LINK_MAX;
3452 pc.pc_namemax = NFS_MAXNAMLEN;
3453 pc.pc_notrunc = 1;
3454 pc.pc_chownrestricted = 1;
3455 pc.pc_caseinsensitive = 0;
3456 pc.pc_casepreserving = 1;
3457 error = 0;
3458 }
3459 switch (ap->a_name) {
3460 case _PC_LINK_MAX:
3461 *ap->a_retval = pc.pc_linkmax;
3462 break;
3463 case _PC_NAME_MAX:
3464 *ap->a_retval = pc.pc_namemax;
3465 break;
3466 case _PC_PATH_MAX:
3467 *ap->a_retval = PATH_MAX;
3468 break;
3469 case _PC_PIPE_BUF:
3470 *ap->a_retval = PIPE_BUF;
3471 break;
3472 case _PC_CHOWN_RESTRICTED:
3473 *ap->a_retval = pc.pc_chownrestricted;
3474 break;
3475 case _PC_NO_TRUNC:
3476 *ap->a_retval = pc.pc_notrunc;
3477 break;
3478 case _PC_ACL_EXTENDED:
3479 *ap->a_retval = 0;
3480 break;
3481 case _PC_ACL_NFS4:
3482 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
3483 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
3484 *ap->a_retval = 1;
3485 else
3486 *ap->a_retval = 0;
3487 break;
3488 case _PC_ACL_PATH_MAX:
3489 if (NFS_ISV4(vp))
3490 *ap->a_retval = ACL_MAX_ENTRIES;
3491 else
3492 *ap->a_retval = 3;
3493 break;
3494 case _PC_MAC_PRESENT:
3495 *ap->a_retval = 0;
3496 break;
3497 case _PC_ASYNC_IO:
3498 /* _PC_ASYNC_IO should have been handled by upper layers. */
3499 KASSERT(0, ("_PC_ASYNC_IO should not get here"));
3500 error = EINVAL;
3501 break;
3502 case _PC_PRIO_IO:
3503 *ap->a_retval = 0;
3504 break;
3505 case _PC_SYNC_IO:
3506 *ap->a_retval = 0;
3507 break;
3508 case _PC_ALLOC_SIZE_MIN:
3509 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
3510 break;
3511 case _PC_FILESIZEBITS:
3512 if (NFS_ISV34(vp))
3513 *ap->a_retval = 64;
3514 else
3515 *ap->a_retval = 32;
3516 break;
3517 case _PC_REC_INCR_XFER_SIZE:
3518 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
3519 break;
3520 case _PC_REC_MAX_XFER_SIZE:
3521 *ap->a_retval = -1; /* means ``unlimited'' */
3522 break;
3523 case _PC_REC_MIN_XFER_SIZE:
3524 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
3525 break;
3526 case _PC_REC_XFER_ALIGN:
3527 *ap->a_retval = PAGE_SIZE;
3528 break;
3529 case _PC_SYMLINK_MAX:
3530 *ap->a_retval = NFS_MAXPATHLEN;
3531 break;
3532
3533 default:
3534 error = EINVAL;
3535 break;
3536 }
3537 return (error);
3538 }
3539
Cache object: 1273ec92185f4ed81dfa1f4983a206be
|