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/10.0/sys/fs/nfsclient/nfs_clvnops.c 252072 2013-06-21 22:26:18Z rmacklem $");
37
38 /*
39 * vnode op calls for Sun NFS version 2, 3 and 4
40 */
41
42 #include "opt_kdtrace.h"
43 #include "opt_inet.h"
44
45 #include <sys/param.h>
46 #include <sys/kernel.h>
47 #include <sys/systm.h>
48 #include <sys/resourcevar.h>
49 #include <sys/proc.h>
50 #include <sys/mount.h>
51 #include <sys/bio.h>
52 #include <sys/buf.h>
53 #include <sys/jail.h>
54 #include <sys/malloc.h>
55 #include <sys/mbuf.h>
56 #include <sys/namei.h>
57 #include <sys/socket.h>
58 #include <sys/vnode.h>
59 #include <sys/dirent.h>
60 #include <sys/fcntl.h>
61 #include <sys/lockf.h>
62 #include <sys/stat.h>
63 #include <sys/sysctl.h>
64 #include <sys/signalvar.h>
65
66 #include <vm/vm.h>
67 #include <vm/vm_extern.h>
68 #include <vm/vm_object.h>
69
70 #include <fs/nfs/nfsport.h>
71 #include <fs/nfsclient/nfsnode.h>
72 #include <fs/nfsclient/nfsmount.h>
73 #include <fs/nfsclient/nfs.h>
74 #include <fs/nfsclient/nfs_kdtrace.h>
75
76 #include <net/if.h>
77 #include <netinet/in.h>
78 #include <netinet/in_var.h>
79
80 #include <nfs/nfs_lock.h>
81
82 #ifdef KDTRACE_HOOKS
83 #include <sys/dtrace_bsd.h>
84
85 dtrace_nfsclient_accesscache_flush_probe_func_t
86 dtrace_nfscl_accesscache_flush_done_probe;
87 uint32_t nfscl_accesscache_flush_done_id;
88
89 dtrace_nfsclient_accesscache_get_probe_func_t
90 dtrace_nfscl_accesscache_get_hit_probe,
91 dtrace_nfscl_accesscache_get_miss_probe;
92 uint32_t nfscl_accesscache_get_hit_id;
93 uint32_t nfscl_accesscache_get_miss_id;
94
95 dtrace_nfsclient_accesscache_load_probe_func_t
96 dtrace_nfscl_accesscache_load_done_probe;
97 uint32_t nfscl_accesscache_load_done_id;
98 #endif /* !KDTRACE_HOOKS */
99
100 /* Defs */
101 #define TRUE 1
102 #define FALSE 0
103
104 extern struct nfsstats newnfsstats;
105 extern int nfsrv_useacl;
106 extern int nfscl_debuglevel;
107 MALLOC_DECLARE(M_NEWNFSREQ);
108
109 /*
110 * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
111 * calls are not in getblk() and brelse() so that they would not be necessary
112 * here.
113 */
114 #ifndef B_VMIO
115 #define vfs_busy_pages(bp, f)
116 #endif
117
118 static vop_read_t nfsfifo_read;
119 static vop_write_t nfsfifo_write;
120 static vop_close_t nfsfifo_close;
121 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
122 struct thread *);
123 static vop_lookup_t nfs_lookup;
124 static vop_create_t nfs_create;
125 static vop_mknod_t nfs_mknod;
126 static vop_open_t nfs_open;
127 static vop_pathconf_t nfs_pathconf;
128 static vop_close_t nfs_close;
129 static vop_access_t nfs_access;
130 static vop_getattr_t nfs_getattr;
131 static vop_setattr_t nfs_setattr;
132 static vop_read_t nfs_read;
133 static vop_fsync_t nfs_fsync;
134 static vop_remove_t nfs_remove;
135 static vop_link_t nfs_link;
136 static vop_rename_t nfs_rename;
137 static vop_mkdir_t nfs_mkdir;
138 static vop_rmdir_t nfs_rmdir;
139 static vop_symlink_t nfs_symlink;
140 static vop_readdir_t nfs_readdir;
141 static vop_strategy_t nfs_strategy;
142 static 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 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva,
773 NULL);
774 if (!ret) {
775 np->n_change = nfsva.na_filerev;
776 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
777 NULL, 0, 0);
778 }
779 }
780
781 /*
782 * and do the close.
783 */
784 ret = nfsrpc_close(vp, 0, ap->a_td);
785 if (!error && ret)
786 error = ret;
787 if (error)
788 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
789 (gid_t)0);
790 }
791 if (newnfs_directio_enable)
792 KASSERT((np->n_directio_asyncwr == 0),
793 ("nfs_close: dirty unflushed (%d) directio buffers\n",
794 np->n_directio_asyncwr));
795 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
796 mtx_lock(&np->n_mtx);
797 KASSERT((np->n_directio_opens > 0),
798 ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
799 np->n_directio_opens--;
800 if (np->n_directio_opens == 0)
801 np->n_flag &= ~NNONCACHE;
802 mtx_unlock(&np->n_mtx);
803 }
804 if (localcred)
805 NFSFREECRED(cred);
806 return (error);
807 }
808
809 /*
810 * nfs getattr call from vfs.
811 */
812 static int
813 nfs_getattr(struct vop_getattr_args *ap)
814 {
815 struct vnode *vp = ap->a_vp;
816 struct thread *td = curthread; /* XXX */
817 struct nfsnode *np = VTONFS(vp);
818 int error = 0;
819 struct nfsvattr nfsva;
820 struct vattr *vap = ap->a_vap;
821 struct vattr vattr;
822
823 /*
824 * Update local times for special files.
825 */
826 mtx_lock(&np->n_mtx);
827 if (np->n_flag & (NACC | NUPD))
828 np->n_flag |= NCHG;
829 mtx_unlock(&np->n_mtx);
830 /*
831 * First look in the cache.
832 */
833 if (ncl_getattrcache(vp, &vattr) == 0) {
834 vap->va_type = vattr.va_type;
835 vap->va_mode = vattr.va_mode;
836 vap->va_nlink = vattr.va_nlink;
837 vap->va_uid = vattr.va_uid;
838 vap->va_gid = vattr.va_gid;
839 vap->va_fsid = vattr.va_fsid;
840 vap->va_fileid = vattr.va_fileid;
841 vap->va_size = vattr.va_size;
842 vap->va_blocksize = vattr.va_blocksize;
843 vap->va_atime = vattr.va_atime;
844 vap->va_mtime = vattr.va_mtime;
845 vap->va_ctime = vattr.va_ctime;
846 vap->va_gen = vattr.va_gen;
847 vap->va_flags = vattr.va_flags;
848 vap->va_rdev = vattr.va_rdev;
849 vap->va_bytes = vattr.va_bytes;
850 vap->va_filerev = vattr.va_filerev;
851 /*
852 * Get the local modify time for the case of a write
853 * delegation.
854 */
855 nfscl_deleggetmodtime(vp, &vap->va_mtime);
856 return (0);
857 }
858
859 if (NFS_ISV34(vp) && nfs_prime_access_cache &&
860 nfsaccess_cache_timeout > 0) {
861 NFSINCRGLOBAL(newnfsstats.accesscache_misses);
862 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
863 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
864 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
865 return (0);
866 }
867 }
868 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL);
869 if (!error)
870 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0);
871 if (!error) {
872 /*
873 * Get the local modify time for the case of a write
874 * delegation.
875 */
876 nfscl_deleggetmodtime(vp, &vap->va_mtime);
877 } else if (NFS_ISV4(vp)) {
878 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
879 }
880 return (error);
881 }
882
883 /*
884 * nfs setattr call.
885 */
886 static int
887 nfs_setattr(struct vop_setattr_args *ap)
888 {
889 struct vnode *vp = ap->a_vp;
890 struct nfsnode *np = VTONFS(vp);
891 struct thread *td = curthread; /* XXX */
892 struct vattr *vap = ap->a_vap;
893 int error = 0;
894 u_quad_t tsize;
895
896 #ifndef nolint
897 tsize = (u_quad_t)0;
898 #endif
899
900 /*
901 * Setting of flags and marking of atimes are not supported.
902 */
903 if (vap->va_flags != VNOVAL)
904 return (EOPNOTSUPP);
905
906 /*
907 * Disallow write attempts if the filesystem is mounted read-only.
908 */
909 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
910 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
911 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
912 (vp->v_mount->mnt_flag & MNT_RDONLY))
913 return (EROFS);
914 if (vap->va_size != VNOVAL) {
915 switch (vp->v_type) {
916 case VDIR:
917 return (EISDIR);
918 case VCHR:
919 case VBLK:
920 case VSOCK:
921 case VFIFO:
922 if (vap->va_mtime.tv_sec == VNOVAL &&
923 vap->va_atime.tv_sec == VNOVAL &&
924 vap->va_mode == (mode_t)VNOVAL &&
925 vap->va_uid == (uid_t)VNOVAL &&
926 vap->va_gid == (gid_t)VNOVAL)
927 return (0);
928 vap->va_size = VNOVAL;
929 break;
930 default:
931 /*
932 * Disallow write attempts if the filesystem is
933 * mounted read-only.
934 */
935 if (vp->v_mount->mnt_flag & MNT_RDONLY)
936 return (EROFS);
937 /*
938 * We run vnode_pager_setsize() early (why?),
939 * we must set np->n_size now to avoid vinvalbuf
940 * V_SAVE races that might setsize a lower
941 * value.
942 */
943 mtx_lock(&np->n_mtx);
944 tsize = np->n_size;
945 mtx_unlock(&np->n_mtx);
946 error = ncl_meta_setsize(vp, ap->a_cred, td,
947 vap->va_size);
948 mtx_lock(&np->n_mtx);
949 if (np->n_flag & NMODIFIED) {
950 tsize = np->n_size;
951 mtx_unlock(&np->n_mtx);
952 if (vap->va_size == 0)
953 error = ncl_vinvalbuf(vp, 0, td, 1);
954 else
955 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
956 if (error) {
957 vnode_pager_setsize(vp, tsize);
958 return (error);
959 }
960 /*
961 * Call nfscl_delegmodtime() to set the modify time
962 * locally, as required.
963 */
964 nfscl_delegmodtime(vp);
965 } else
966 mtx_unlock(&np->n_mtx);
967 /*
968 * np->n_size has already been set to vap->va_size
969 * in ncl_meta_setsize(). We must set it again since
970 * nfs_loadattrcache() could be called through
971 * ncl_meta_setsize() and could modify np->n_size.
972 */
973 mtx_lock(&np->n_mtx);
974 np->n_vattr.na_size = np->n_size = vap->va_size;
975 mtx_unlock(&np->n_mtx);
976 };
977 } else {
978 mtx_lock(&np->n_mtx);
979 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) &&
980 (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
981 mtx_unlock(&np->n_mtx);
982 if ((error = ncl_vinvalbuf(vp, V_SAVE, td, 1)) != 0 &&
983 (error == EINTR || error == EIO))
984 return (error);
985 } else
986 mtx_unlock(&np->n_mtx);
987 }
988 error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
989 if (error && vap->va_size != VNOVAL) {
990 mtx_lock(&np->n_mtx);
991 np->n_size = np->n_vattr.na_size = tsize;
992 vnode_pager_setsize(vp, tsize);
993 mtx_unlock(&np->n_mtx);
994 }
995 return (error);
996 }
997
998 /*
999 * Do an nfs setattr rpc.
1000 */
1001 static int
1002 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
1003 struct thread *td)
1004 {
1005 struct nfsnode *np = VTONFS(vp);
1006 int error, ret, attrflag, i;
1007 struct nfsvattr nfsva;
1008
1009 if (NFS_ISV34(vp)) {
1010 mtx_lock(&np->n_mtx);
1011 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
1012 np->n_accesscache[i].stamp = 0;
1013 np->n_flag |= NDELEGMOD;
1014 mtx_unlock(&np->n_mtx);
1015 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
1016 }
1017 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag,
1018 NULL);
1019 if (attrflag) {
1020 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1021 if (ret && !error)
1022 error = ret;
1023 }
1024 if (error && NFS_ISV4(vp))
1025 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
1026 return (error);
1027 }
1028
1029 /*
1030 * nfs lookup call, one step at a time...
1031 * First look in cache
1032 * If not found, unlock the directory nfsnode and do the rpc
1033 */
1034 static int
1035 nfs_lookup(struct vop_lookup_args *ap)
1036 {
1037 struct componentname *cnp = ap->a_cnp;
1038 struct vnode *dvp = ap->a_dvp;
1039 struct vnode **vpp = ap->a_vpp;
1040 struct mount *mp = dvp->v_mount;
1041 int flags = cnp->cn_flags;
1042 struct vnode *newvp;
1043 struct nfsmount *nmp;
1044 struct nfsnode *np, *newnp;
1045 int error = 0, attrflag, dattrflag, ltype, ncticks;
1046 struct thread *td = cnp->cn_thread;
1047 struct nfsfh *nfhp;
1048 struct nfsvattr dnfsva, nfsva;
1049 struct vattr vattr;
1050 struct timespec nctime;
1051
1052 *vpp = NULLVP;
1053 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
1054 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
1055 return (EROFS);
1056 if (dvp->v_type != VDIR)
1057 return (ENOTDIR);
1058 nmp = VFSTONFS(mp);
1059 np = VTONFS(dvp);
1060
1061 /* For NFSv4, wait until any remove is done. */
1062 mtx_lock(&np->n_mtx);
1063 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
1064 np->n_flag |= NREMOVEWANT;
1065 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
1066 }
1067 mtx_unlock(&np->n_mtx);
1068
1069 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0)
1070 return (error);
1071 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks);
1072 if (error > 0 && error != ENOENT)
1073 return (error);
1074 if (error == -1) {
1075 /*
1076 * Lookups of "." are special and always return the
1077 * current directory. cache_lookup() already handles
1078 * associated locking bookkeeping, etc.
1079 */
1080 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
1081 /* XXX: Is this really correct? */
1082 if (cnp->cn_nameiop != LOOKUP &&
1083 (flags & ISLASTCN))
1084 cnp->cn_flags |= SAVENAME;
1085 return (0);
1086 }
1087
1088 /*
1089 * We only accept a positive hit in the cache if the
1090 * change time of the file matches our cached copy.
1091 * Otherwise, we discard the cache entry and fallback
1092 * to doing a lookup RPC. We also only trust cache
1093 * entries for less than nm_nametimeo seconds.
1094 *
1095 * To better handle stale file handles and attributes,
1096 * clear the attribute cache of this node if it is a
1097 * leaf component, part of an open() call, and not
1098 * locally modified before fetching the attributes.
1099 * This should allow stale file handles to be detected
1100 * here where we can fall back to a LOOKUP RPC to
1101 * recover rather than having nfs_open() detect the
1102 * stale file handle and failing open(2) with ESTALE.
1103 */
1104 newvp = *vpp;
1105 newnp = VTONFS(newvp);
1106 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
1107 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1108 !(newnp->n_flag & NMODIFIED)) {
1109 mtx_lock(&newnp->n_mtx);
1110 newnp->n_attrstamp = 0;
1111 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1112 mtx_unlock(&newnp->n_mtx);
1113 }
1114 if (nfscl_nodeleg(newvp, 0) == 0 ||
1115 ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) &&
1116 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
1117 timespeccmp(&vattr.va_ctime, &nctime, ==))) {
1118 NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
1119 if (cnp->cn_nameiop != LOOKUP &&
1120 (flags & ISLASTCN))
1121 cnp->cn_flags |= SAVENAME;
1122 return (0);
1123 }
1124 cache_purge(newvp);
1125 if (dvp != newvp)
1126 vput(newvp);
1127 else
1128 vrele(newvp);
1129 *vpp = NULLVP;
1130 } else if (error == ENOENT) {
1131 if (dvp->v_iflag & VI_DOOMED)
1132 return (ENOENT);
1133 /*
1134 * We only accept a negative hit in the cache if the
1135 * modification time of the parent directory matches
1136 * the cached copy in the name cache entry.
1137 * Otherwise, we discard all of the negative cache
1138 * entries for this directory. We also only trust
1139 * negative cache entries for up to nm_negnametimeo
1140 * seconds.
1141 */
1142 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) &&
1143 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
1144 timespeccmp(&vattr.va_mtime, &nctime, ==)) {
1145 NFSINCRGLOBAL(newnfsstats.lookupcache_hits);
1146 return (ENOENT);
1147 }
1148 cache_purge_negative(dvp);
1149 }
1150
1151 error = 0;
1152 newvp = NULLVP;
1153 NFSINCRGLOBAL(newnfsstats.lookupcache_misses);
1154 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1155 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1156 NULL);
1157 if (dattrflag)
1158 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1159 if (error) {
1160 if (newvp != NULLVP) {
1161 vput(newvp);
1162 *vpp = NULLVP;
1163 }
1164
1165 if (error != ENOENT) {
1166 if (NFS_ISV4(dvp))
1167 error = nfscl_maperr(td, error, (uid_t)0,
1168 (gid_t)0);
1169 return (error);
1170 }
1171
1172 /* The requested file was not found. */
1173 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
1174 (flags & ISLASTCN)) {
1175 /*
1176 * XXX: UFS does a full VOP_ACCESS(dvp,
1177 * VWRITE) here instead of just checking
1178 * MNT_RDONLY.
1179 */
1180 if (mp->mnt_flag & MNT_RDONLY)
1181 return (EROFS);
1182 cnp->cn_flags |= SAVENAME;
1183 return (EJUSTRETURN);
1184 }
1185
1186 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE &&
1187 dattrflag) {
1188 /*
1189 * Cache the modification time of the parent
1190 * directory from the post-op attributes in
1191 * the name cache entry. The negative cache
1192 * entry will be ignored once the directory
1193 * has changed. Don't bother adding the entry
1194 * if the directory has already changed.
1195 */
1196 mtx_lock(&np->n_mtx);
1197 if (timespeccmp(&np->n_vattr.na_mtime,
1198 &dnfsva.na_mtime, ==)) {
1199 mtx_unlock(&np->n_mtx);
1200 cache_enter_time(dvp, NULL, cnp,
1201 &dnfsva.na_mtime, NULL);
1202 } else
1203 mtx_unlock(&np->n_mtx);
1204 }
1205 return (ENOENT);
1206 }
1207
1208 /*
1209 * Handle RENAME case...
1210 */
1211 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
1212 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1213 FREE((caddr_t)nfhp, M_NFSFH);
1214 return (EISDIR);
1215 }
1216 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1217 LK_EXCLUSIVE);
1218 if (error)
1219 return (error);
1220 newvp = NFSTOV(np);
1221 if (attrflag)
1222 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1223 0, 1);
1224 *vpp = newvp;
1225 cnp->cn_flags |= SAVENAME;
1226 return (0);
1227 }
1228
1229 if (flags & ISDOTDOT) {
1230 ltype = NFSVOPISLOCKED(dvp);
1231 error = vfs_busy(mp, MBF_NOWAIT);
1232 if (error != 0) {
1233 vfs_ref(mp);
1234 NFSVOPUNLOCK(dvp, 0);
1235 error = vfs_busy(mp, 0);
1236 NFSVOPLOCK(dvp, ltype | LK_RETRY);
1237 vfs_rel(mp);
1238 if (error == 0 && (dvp->v_iflag & VI_DOOMED)) {
1239 vfs_unbusy(mp);
1240 error = ENOENT;
1241 }
1242 if (error != 0)
1243 return (error);
1244 }
1245 NFSVOPUNLOCK(dvp, 0);
1246 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1247 cnp->cn_lkflags);
1248 if (error == 0)
1249 newvp = NFSTOV(np);
1250 vfs_unbusy(mp);
1251 if (newvp != dvp)
1252 NFSVOPLOCK(dvp, ltype | LK_RETRY);
1253 if (dvp->v_iflag & VI_DOOMED) {
1254 if (error == 0) {
1255 if (newvp == dvp)
1256 vrele(newvp);
1257 else
1258 vput(newvp);
1259 }
1260 error = ENOENT;
1261 }
1262 if (error != 0)
1263 return (error);
1264 if (attrflag)
1265 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1266 0, 1);
1267 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1268 FREE((caddr_t)nfhp, M_NFSFH);
1269 VREF(dvp);
1270 newvp = dvp;
1271 if (attrflag)
1272 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1273 0, 1);
1274 } else {
1275 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL,
1276 cnp->cn_lkflags);
1277 if (error)
1278 return (error);
1279 newvp = NFSTOV(np);
1280 if (attrflag)
1281 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1282 0, 1);
1283 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) &&
1284 !(np->n_flag & NMODIFIED)) {
1285 /*
1286 * Flush the attribute cache when opening a
1287 * leaf node to ensure that fresh attributes
1288 * are fetched in nfs_open() since we did not
1289 * fetch attributes from the LOOKUP reply.
1290 */
1291 mtx_lock(&np->n_mtx);
1292 np->n_attrstamp = 0;
1293 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1294 mtx_unlock(&np->n_mtx);
1295 }
1296 }
1297 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
1298 cnp->cn_flags |= SAVENAME;
1299 if ((cnp->cn_flags & MAKEENTRY) &&
1300 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
1301 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
1302 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
1303 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime);
1304 *vpp = newvp;
1305 return (0);
1306 }
1307
1308 /*
1309 * nfs read call.
1310 * Just call ncl_bioread() to do the work.
1311 */
1312 static int
1313 nfs_read(struct vop_read_args *ap)
1314 {
1315 struct vnode *vp = ap->a_vp;
1316
1317 switch (vp->v_type) {
1318 case VREG:
1319 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
1320 case VDIR:
1321 return (EISDIR);
1322 default:
1323 return (EOPNOTSUPP);
1324 }
1325 }
1326
1327 /*
1328 * nfs readlink call
1329 */
1330 static int
1331 nfs_readlink(struct vop_readlink_args *ap)
1332 {
1333 struct vnode *vp = ap->a_vp;
1334
1335 if (vp->v_type != VLNK)
1336 return (EINVAL);
1337 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
1338 }
1339
1340 /*
1341 * Do a readlink rpc.
1342 * Called by ncl_doio() from below the buffer cache.
1343 */
1344 int
1345 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1346 {
1347 int error, ret, attrflag;
1348 struct nfsvattr nfsva;
1349
1350 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
1351 &attrflag, NULL);
1352 if (attrflag) {
1353 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1354 if (ret && !error)
1355 error = ret;
1356 }
1357 if (error && NFS_ISV4(vp))
1358 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1359 return (error);
1360 }
1361
1362 /*
1363 * nfs read rpc call
1364 * Ditto above
1365 */
1366 int
1367 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1368 {
1369 int error, ret, attrflag;
1370 struct nfsvattr nfsva;
1371 struct nfsmount *nmp;
1372
1373 nmp = VFSTONFS(vnode_mount(vp));
1374 error = EIO;
1375 attrflag = 0;
1376 if (NFSHASPNFS(nmp))
1377 error = nfscl_doiods(vp, uiop, NULL, NULL,
1378 NFSV4OPEN_ACCESSREAD, cred, uiop->uio_td);
1379 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error);
1380 if (error != 0)
1381 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva,
1382 &attrflag, NULL);
1383 if (attrflag) {
1384 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
1385 if (ret && !error)
1386 error = ret;
1387 }
1388 if (error && NFS_ISV4(vp))
1389 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1390 return (error);
1391 }
1392
1393 /*
1394 * nfs write call
1395 */
1396 int
1397 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
1398 int *iomode, int *must_commit, int called_from_strategy)
1399 {
1400 struct nfsvattr nfsva;
1401 int error, attrflag, ret;
1402 struct nfsmount *nmp;
1403
1404 nmp = VFSTONFS(vnode_mount(vp));
1405 error = EIO;
1406 attrflag = 0;
1407 if (NFSHASPNFS(nmp))
1408 error = nfscl_doiods(vp, uiop, iomode, must_commit,
1409 NFSV4OPEN_ACCESSWRITE, cred, uiop->uio_td);
1410 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error);
1411 if (error != 0)
1412 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
1413 uiop->uio_td, &nfsva, &attrflag, NULL,
1414 called_from_strategy);
1415 if (attrflag) {
1416 if (VTONFS(vp)->n_flag & ND_NFSV4)
1417 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1,
1418 1);
1419 else
1420 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
1421 1);
1422 if (ret && !error)
1423 error = ret;
1424 }
1425 if (DOINGASYNC(vp))
1426 *iomode = NFSWRITE_FILESYNC;
1427 if (error && NFS_ISV4(vp))
1428 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1429 return (error);
1430 }
1431
1432 /*
1433 * nfs mknod rpc
1434 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
1435 * mode set to specify the file type and the size field for rdev.
1436 */
1437 static int
1438 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
1439 struct vattr *vap)
1440 {
1441 struct nfsvattr nfsva, dnfsva;
1442 struct vnode *newvp = NULL;
1443 struct nfsnode *np = NULL, *dnp;
1444 struct nfsfh *nfhp;
1445 struct vattr vattr;
1446 int error = 0, attrflag, dattrflag;
1447 u_int32_t rdev;
1448
1449 if (vap->va_type == VCHR || vap->va_type == VBLK)
1450 rdev = vap->va_rdev;
1451 else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
1452 rdev = 0xffffffff;
1453 else
1454 return (EOPNOTSUPP);
1455 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1456 return (error);
1457 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
1458 rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva,
1459 &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
1460 if (!error) {
1461 if (!nfhp)
1462 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1463 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
1464 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1465 NULL);
1466 if (nfhp)
1467 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1468 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
1469 }
1470 if (dattrflag)
1471 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1472 if (!error) {
1473 newvp = NFSTOV(np);
1474 if (attrflag != 0) {
1475 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1476 0, 1);
1477 if (error != 0)
1478 vput(newvp);
1479 }
1480 }
1481 if (!error) {
1482 *vpp = newvp;
1483 } else if (NFS_ISV4(dvp)) {
1484 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
1485 vap->va_gid);
1486 }
1487 dnp = VTONFS(dvp);
1488 mtx_lock(&dnp->n_mtx);
1489 dnp->n_flag |= NMODIFIED;
1490 if (!dattrflag) {
1491 dnp->n_attrstamp = 0;
1492 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1493 }
1494 mtx_unlock(&dnp->n_mtx);
1495 return (error);
1496 }
1497
1498 /*
1499 * nfs mknod vop
1500 * just call nfs_mknodrpc() to do the work.
1501 */
1502 /* ARGSUSED */
1503 static int
1504 nfs_mknod(struct vop_mknod_args *ap)
1505 {
1506 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
1507 }
1508
1509 static struct mtx nfs_cverf_mtx;
1510 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex",
1511 MTX_DEF);
1512
1513 static nfsquad_t
1514 nfs_get_cverf(void)
1515 {
1516 static nfsquad_t cverf;
1517 nfsquad_t ret;
1518 static int cverf_initialized = 0;
1519
1520 mtx_lock(&nfs_cverf_mtx);
1521 if (cverf_initialized == 0) {
1522 cverf.lval[0] = arc4random();
1523 cverf.lval[1] = arc4random();
1524 cverf_initialized = 1;
1525 } else
1526 cverf.qval++;
1527 ret = cverf;
1528 mtx_unlock(&nfs_cverf_mtx);
1529
1530 return (ret);
1531 }
1532
1533 /*
1534 * nfs file create call
1535 */
1536 static int
1537 nfs_create(struct vop_create_args *ap)
1538 {
1539 struct vnode *dvp = ap->a_dvp;
1540 struct vattr *vap = ap->a_vap;
1541 struct componentname *cnp = ap->a_cnp;
1542 struct nfsnode *np = NULL, *dnp;
1543 struct vnode *newvp = NULL;
1544 struct nfsmount *nmp;
1545 struct nfsvattr dnfsva, nfsva;
1546 struct nfsfh *nfhp;
1547 nfsquad_t cverf;
1548 int error = 0, attrflag, dattrflag, fmode = 0;
1549 struct vattr vattr;
1550
1551 /*
1552 * Oops, not for me..
1553 */
1554 if (vap->va_type == VSOCK)
1555 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
1556
1557 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1558 return (error);
1559 if (vap->va_vaflags & VA_EXCLUSIVE)
1560 fmode |= O_EXCL;
1561 dnp = VTONFS(dvp);
1562 nmp = VFSTONFS(vnode_mount(dvp));
1563 again:
1564 /* For NFSv4, wait until any remove is done. */
1565 mtx_lock(&dnp->n_mtx);
1566 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
1567 dnp->n_flag |= NREMOVEWANT;
1568 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
1569 }
1570 mtx_unlock(&dnp->n_mtx);
1571
1572 cverf = nfs_get_cverf();
1573 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1574 vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva,
1575 &nfhp, &attrflag, &dattrflag, NULL);
1576 if (!error) {
1577 if (nfhp == NULL)
1578 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1579 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread,
1580 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1581 NULL);
1582 if (nfhp != NULL)
1583 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1584 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE);
1585 }
1586 if (dattrflag)
1587 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1588 if (!error) {
1589 newvp = NFSTOV(np);
1590 if (attrflag == 0)
1591 error = nfsrpc_getattr(newvp, cnp->cn_cred,
1592 cnp->cn_thread, &nfsva, NULL);
1593 if (error == 0)
1594 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
1595 0, 1);
1596 }
1597 if (error) {
1598 if (newvp != NULL) {
1599 vput(newvp);
1600 newvp = NULL;
1601 }
1602 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
1603 error == NFSERR_NOTSUPP) {
1604 fmode &= ~O_EXCL;
1605 goto again;
1606 }
1607 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
1608 if (nfscl_checksattr(vap, &nfsva)) {
1609 /*
1610 * We are normally called with only a partially
1611 * initialized VAP. Since the NFSv3 spec says that
1612 * the server may use the file attributes to
1613 * store the verifier, the spec requires us to do a
1614 * SETATTR RPC. FreeBSD servers store the verifier in
1615 * atime, but we can't really assume that all servers
1616 * will so we ensure that our SETATTR sets both atime
1617 * and mtime.
1618 */
1619 if (vap->va_mtime.tv_sec == VNOVAL)
1620 vfs_timestamp(&vap->va_mtime);
1621 if (vap->va_atime.tv_sec == VNOVAL)
1622 vap->va_atime = vap->va_mtime;
1623 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
1624 cnp->cn_thread, &nfsva, &attrflag, NULL);
1625 if (error && (vap->va_uid != (uid_t)VNOVAL ||
1626 vap->va_gid != (gid_t)VNOVAL)) {
1627 /* try again without setting uid/gid */
1628 vap->va_uid = (uid_t)VNOVAL;
1629 vap->va_gid = (uid_t)VNOVAL;
1630 error = nfsrpc_setattr(newvp, vap, NULL,
1631 cnp->cn_cred, cnp->cn_thread, &nfsva,
1632 &attrflag, NULL);
1633 }
1634 if (attrflag)
1635 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
1636 NULL, 0, 1);
1637 if (error != 0)
1638 vput(newvp);
1639 }
1640 }
1641 if (!error) {
1642 if ((cnp->cn_flags & MAKEENTRY) && attrflag)
1643 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
1644 NULL);
1645 *ap->a_vpp = newvp;
1646 } else if (NFS_ISV4(dvp)) {
1647 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid,
1648 vap->va_gid);
1649 }
1650 mtx_lock(&dnp->n_mtx);
1651 dnp->n_flag |= NMODIFIED;
1652 if (!dattrflag) {
1653 dnp->n_attrstamp = 0;
1654 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1655 }
1656 mtx_unlock(&dnp->n_mtx);
1657 return (error);
1658 }
1659
1660 /*
1661 * nfs file remove call
1662 * To try and make nfs semantics closer to ufs semantics, a file that has
1663 * other processes using the vnode is renamed instead of removed and then
1664 * removed later on the last close.
1665 * - If v_usecount > 1
1666 * If a rename is not already in the works
1667 * call nfs_sillyrename() to set it up
1668 * else
1669 * do the remove rpc
1670 */
1671 static int
1672 nfs_remove(struct vop_remove_args *ap)
1673 {
1674 struct vnode *vp = ap->a_vp;
1675 struct vnode *dvp = ap->a_dvp;
1676 struct componentname *cnp = ap->a_cnp;
1677 struct nfsnode *np = VTONFS(vp);
1678 int error = 0;
1679 struct vattr vattr;
1680
1681 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name"));
1682 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
1683 if (vp->v_type == VDIR)
1684 error = EPERM;
1685 else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
1686 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
1687 vattr.va_nlink > 1)) {
1688 /*
1689 * Purge the name cache so that the chance of a lookup for
1690 * the name succeeding while the remove is in progress is
1691 * minimized. Without node locking it can still happen, such
1692 * that an I/O op returns ESTALE, but since you get this if
1693 * another host removes the file..
1694 */
1695 cache_purge(vp);
1696 /*
1697 * throw away biocache buffers, mainly to avoid
1698 * unnecessary delayed writes later.
1699 */
1700 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1);
1701 /* Do the rpc */
1702 if (error != EINTR && error != EIO)
1703 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
1704 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
1705 /*
1706 * Kludge City: If the first reply to the remove rpc is lost..
1707 * the reply to the retransmitted request will be ENOENT
1708 * since the file was in fact removed
1709 * Therefore, we cheat and return success.
1710 */
1711 if (error == ENOENT)
1712 error = 0;
1713 } else if (!np->n_sillyrename)
1714 error = nfs_sillyrename(dvp, vp, cnp);
1715 mtx_lock(&np->n_mtx);
1716 np->n_attrstamp = 0;
1717 mtx_unlock(&np->n_mtx);
1718 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1719 return (error);
1720 }
1721
1722 /*
1723 * nfs file remove rpc called from nfs_inactive
1724 */
1725 int
1726 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
1727 {
1728 /*
1729 * Make sure that the directory vnode is still valid.
1730 * XXX we should lock sp->s_dvp here.
1731 */
1732 if (sp->s_dvp->v_type == VBAD)
1733 return (0);
1734 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
1735 sp->s_cred, NULL));
1736 }
1737
1738 /*
1739 * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
1740 */
1741 static int
1742 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
1743 int namelen, struct ucred *cred, struct thread *td)
1744 {
1745 struct nfsvattr dnfsva;
1746 struct nfsnode *dnp = VTONFS(dvp);
1747 int error = 0, dattrflag;
1748
1749 mtx_lock(&dnp->n_mtx);
1750 dnp->n_flag |= NREMOVEINPROG;
1751 mtx_unlock(&dnp->n_mtx);
1752 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva,
1753 &dattrflag, NULL);
1754 mtx_lock(&dnp->n_mtx);
1755 if ((dnp->n_flag & NREMOVEWANT)) {
1756 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
1757 mtx_unlock(&dnp->n_mtx);
1758 wakeup((caddr_t)dnp);
1759 } else {
1760 dnp->n_flag &= ~NREMOVEINPROG;
1761 mtx_unlock(&dnp->n_mtx);
1762 }
1763 if (dattrflag)
1764 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
1765 mtx_lock(&dnp->n_mtx);
1766 dnp->n_flag |= NMODIFIED;
1767 if (!dattrflag) {
1768 dnp->n_attrstamp = 0;
1769 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1770 }
1771 mtx_unlock(&dnp->n_mtx);
1772 if (error && NFS_ISV4(dvp))
1773 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1774 return (error);
1775 }
1776
1777 /*
1778 * nfs file rename call
1779 */
1780 static int
1781 nfs_rename(struct vop_rename_args *ap)
1782 {
1783 struct vnode *fvp = ap->a_fvp;
1784 struct vnode *tvp = ap->a_tvp;
1785 struct vnode *fdvp = ap->a_fdvp;
1786 struct vnode *tdvp = ap->a_tdvp;
1787 struct componentname *tcnp = ap->a_tcnp;
1788 struct componentname *fcnp = ap->a_fcnp;
1789 struct nfsnode *fnp = VTONFS(ap->a_fvp);
1790 struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
1791 struct nfsv4node *newv4 = NULL;
1792 int error;
1793
1794 KASSERT((tcnp->cn_flags & HASBUF) != 0 &&
1795 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name"));
1796 /* Check for cross-device rename */
1797 if ((fvp->v_mount != tdvp->v_mount) ||
1798 (tvp && (fvp->v_mount != tvp->v_mount))) {
1799 error = EXDEV;
1800 goto out;
1801 }
1802
1803 if (fvp == tvp) {
1804 ncl_printf("nfs_rename: fvp == tvp (can't happen)\n");
1805 error = 0;
1806 goto out;
1807 }
1808 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
1809 goto out;
1810
1811 /*
1812 * We have to flush B_DELWRI data prior to renaming
1813 * the file. If we don't, the delayed-write buffers
1814 * can be flushed out later after the file has gone stale
1815 * under NFSV3. NFSV2 does not have this problem because
1816 * ( as far as I can tell ) it flushes dirty buffers more
1817 * often.
1818 *
1819 * Skip the rename operation if the fsync fails, this can happen
1820 * due to the server's volume being full, when we pushed out data
1821 * that was written back to our cache earlier. Not checking for
1822 * this condition can result in potential (silent) data loss.
1823 */
1824 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread);
1825 NFSVOPUNLOCK(fvp, 0);
1826 if (!error && tvp)
1827 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
1828 if (error)
1829 goto out;
1830
1831 /*
1832 * If the tvp exists and is in use, sillyrename it before doing the
1833 * rename of the new file over it.
1834 * XXX Can't sillyrename a directory.
1835 */
1836 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
1837 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
1838 vput(tvp);
1839 tvp = NULL;
1840 }
1841
1842 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
1843 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
1844 tcnp->cn_thread);
1845
1846 if (error == 0 && NFS_ISV4(tdvp)) {
1847 /*
1848 * For NFSv4, check to see if it is the same name and
1849 * replace the name, if it is different.
1850 */
1851 MALLOC(newv4, struct nfsv4node *,
1852 sizeof (struct nfsv4node) +
1853 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
1854 M_NFSV4NODE, M_WAITOK);
1855 mtx_lock(&tdnp->n_mtx);
1856 mtx_lock(&fnp->n_mtx);
1857 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
1858 (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
1859 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
1860 tcnp->cn_namelen) ||
1861 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
1862 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
1863 tdnp->n_fhp->nfh_len))) {
1864 #ifdef notdef
1865 { char nnn[100]; int nnnl;
1866 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99;
1867 bcopy(tcnp->cn_nameptr, nnn, nnnl);
1868 nnn[nnnl] = '\0';
1869 printf("ren replace=%s\n",nnn);
1870 }
1871 #endif
1872 FREE((caddr_t)fnp->n_v4, M_NFSV4NODE);
1873 fnp->n_v4 = newv4;
1874 newv4 = NULL;
1875 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
1876 fnp->n_v4->n4_namelen = tcnp->cn_namelen;
1877 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
1878 tdnp->n_fhp->nfh_len);
1879 NFSBCOPY(tcnp->cn_nameptr,
1880 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
1881 }
1882 mtx_unlock(&tdnp->n_mtx);
1883 mtx_unlock(&fnp->n_mtx);
1884 if (newv4 != NULL)
1885 FREE((caddr_t)newv4, M_NFSV4NODE);
1886 }
1887
1888 if (fvp->v_type == VDIR) {
1889 if (tvp != NULL && tvp->v_type == VDIR)
1890 cache_purge(tdvp);
1891 cache_purge(fdvp);
1892 }
1893
1894 out:
1895 if (tdvp == tvp)
1896 vrele(tdvp);
1897 else
1898 vput(tdvp);
1899 if (tvp)
1900 vput(tvp);
1901 vrele(fdvp);
1902 vrele(fvp);
1903 /*
1904 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
1905 */
1906 if (error == ENOENT)
1907 error = 0;
1908 return (error);
1909 }
1910
1911 /*
1912 * nfs file rename rpc called from nfs_remove() above
1913 */
1914 static int
1915 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
1916 struct sillyrename *sp)
1917 {
1918
1919 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
1920 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred,
1921 scnp->cn_thread));
1922 }
1923
1924 /*
1925 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
1926 */
1927 static int
1928 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
1929 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
1930 int tnamelen, struct ucred *cred, struct thread *td)
1931 {
1932 struct nfsvattr fnfsva, tnfsva;
1933 struct nfsnode *fdnp = VTONFS(fdvp);
1934 struct nfsnode *tdnp = VTONFS(tdvp);
1935 int error = 0, fattrflag, tattrflag;
1936
1937 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
1938 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag,
1939 &tattrflag, NULL, NULL);
1940 mtx_lock(&fdnp->n_mtx);
1941 fdnp->n_flag |= NMODIFIED;
1942 if (fattrflag != 0) {
1943 mtx_unlock(&fdnp->n_mtx);
1944 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1);
1945 } else {
1946 fdnp->n_attrstamp = 0;
1947 mtx_unlock(&fdnp->n_mtx);
1948 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
1949 }
1950 mtx_lock(&tdnp->n_mtx);
1951 tdnp->n_flag |= NMODIFIED;
1952 if (tattrflag != 0) {
1953 mtx_unlock(&tdnp->n_mtx);
1954 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1);
1955 } else {
1956 tdnp->n_attrstamp = 0;
1957 mtx_unlock(&tdnp->n_mtx);
1958 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
1959 }
1960 if (error && NFS_ISV4(fdvp))
1961 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1962 return (error);
1963 }
1964
1965 /*
1966 * nfs hard link create call
1967 */
1968 static int
1969 nfs_link(struct vop_link_args *ap)
1970 {
1971 struct vnode *vp = ap->a_vp;
1972 struct vnode *tdvp = ap->a_tdvp;
1973 struct componentname *cnp = ap->a_cnp;
1974 struct nfsnode *np, *tdnp;
1975 struct nfsvattr nfsva, dnfsva;
1976 int error = 0, attrflag, dattrflag;
1977
1978 if (vp->v_mount != tdvp->v_mount) {
1979 return (EXDEV);
1980 }
1981
1982 /*
1983 * Push all writes to the server, so that the attribute cache
1984 * doesn't get "out of sync" with the server.
1985 * XXX There should be a better way!
1986 */
1987 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread);
1988
1989 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
1990 cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag,
1991 &dattrflag, NULL);
1992 tdnp = VTONFS(tdvp);
1993 mtx_lock(&tdnp->n_mtx);
1994 tdnp->n_flag |= NMODIFIED;
1995 if (dattrflag != 0) {
1996 mtx_unlock(&tdnp->n_mtx);
1997 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1);
1998 } else {
1999 tdnp->n_attrstamp = 0;
2000 mtx_unlock(&tdnp->n_mtx);
2001 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
2002 }
2003 if (attrflag)
2004 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2005 else {
2006 np = VTONFS(vp);
2007 mtx_lock(&np->n_mtx);
2008 np->n_attrstamp = 0;
2009 mtx_unlock(&np->n_mtx);
2010 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
2011 }
2012 /*
2013 * If negative lookup caching is enabled, I might as well
2014 * add an entry for this node. Not necessary for correctness,
2015 * but if negative caching is enabled, then the system
2016 * must care about lookup caching hit rate, so...
2017 */
2018 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
2019 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2020 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL);
2021 }
2022 if (error && NFS_ISV4(vp))
2023 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
2024 (gid_t)0);
2025 return (error);
2026 }
2027
2028 /*
2029 * nfs symbolic link create call
2030 */
2031 static int
2032 nfs_symlink(struct vop_symlink_args *ap)
2033 {
2034 struct vnode *dvp = ap->a_dvp;
2035 struct vattr *vap = ap->a_vap;
2036 struct componentname *cnp = ap->a_cnp;
2037 struct nfsvattr nfsva, dnfsva;
2038 struct nfsfh *nfhp;
2039 struct nfsnode *np = NULL, *dnp;
2040 struct vnode *newvp = NULL;
2041 int error = 0, attrflag, dattrflag, ret;
2042
2043 vap->va_type = VLNK;
2044 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2045 ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva,
2046 &nfsva, &nfhp, &attrflag, &dattrflag, NULL);
2047 if (nfhp) {
2048 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
2049 &np, NULL, LK_EXCLUSIVE);
2050 if (!ret)
2051 newvp = NFSTOV(np);
2052 else if (!error)
2053 error = ret;
2054 }
2055 if (newvp != NULL) {
2056 if (attrflag)
2057 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
2058 0, 1);
2059 } else if (!error) {
2060 /*
2061 * If we do not have an error and we could not extract the
2062 * newvp from the response due to the request being NFSv2, we
2063 * have to do a lookup in order to obtain a newvp to return.
2064 */
2065 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2066 cnp->cn_cred, cnp->cn_thread, &np);
2067 if (!error)
2068 newvp = NFSTOV(np);
2069 }
2070 if (error) {
2071 if (newvp)
2072 vput(newvp);
2073 if (NFS_ISV4(dvp))
2074 error = nfscl_maperr(cnp->cn_thread, error,
2075 vap->va_uid, vap->va_gid);
2076 } else {
2077 *ap->a_vpp = newvp;
2078 }
2079
2080 dnp = VTONFS(dvp);
2081 mtx_lock(&dnp->n_mtx);
2082 dnp->n_flag |= NMODIFIED;
2083 if (dattrflag != 0) {
2084 mtx_unlock(&dnp->n_mtx);
2085 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2086 } else {
2087 dnp->n_attrstamp = 0;
2088 mtx_unlock(&dnp->n_mtx);
2089 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2090 }
2091 /*
2092 * If negative lookup caching is enabled, I might as well
2093 * add an entry for this node. Not necessary for correctness,
2094 * but if negative caching is enabled, then the system
2095 * must care about lookup caching hit rate, so...
2096 */
2097 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2098 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2099 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, NULL);
2100 }
2101 return (error);
2102 }
2103
2104 /*
2105 * nfs make dir call
2106 */
2107 static int
2108 nfs_mkdir(struct vop_mkdir_args *ap)
2109 {
2110 struct vnode *dvp = ap->a_dvp;
2111 struct vattr *vap = ap->a_vap;
2112 struct componentname *cnp = ap->a_cnp;
2113 struct nfsnode *np = NULL, *dnp;
2114 struct vnode *newvp = NULL;
2115 struct vattr vattr;
2116 struct nfsfh *nfhp;
2117 struct nfsvattr nfsva, dnfsva;
2118 int error = 0, attrflag, dattrflag, ret;
2119
2120 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
2121 return (error);
2122 vap->va_type = VDIR;
2123 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2124 vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp,
2125 &attrflag, &dattrflag, NULL);
2126 dnp = VTONFS(dvp);
2127 mtx_lock(&dnp->n_mtx);
2128 dnp->n_flag |= NMODIFIED;
2129 if (dattrflag != 0) {
2130 mtx_unlock(&dnp->n_mtx);
2131 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2132 } else {
2133 dnp->n_attrstamp = 0;
2134 mtx_unlock(&dnp->n_mtx);
2135 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2136 }
2137 if (nfhp) {
2138 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread,
2139 &np, NULL, LK_EXCLUSIVE);
2140 if (!ret) {
2141 newvp = NFSTOV(np);
2142 if (attrflag)
2143 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
2144 NULL, 0, 1);
2145 } else if (!error)
2146 error = ret;
2147 }
2148 if (!error && newvp == NULL) {
2149 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2150 cnp->cn_cred, cnp->cn_thread, &np);
2151 if (!error) {
2152 newvp = NFSTOV(np);
2153 if (newvp->v_type != VDIR)
2154 error = EEXIST;
2155 }
2156 }
2157 if (error) {
2158 if (newvp)
2159 vput(newvp);
2160 if (NFS_ISV4(dvp))
2161 error = nfscl_maperr(cnp->cn_thread, error,
2162 vap->va_uid, vap->va_gid);
2163 } else {
2164 /*
2165 * If negative lookup caching is enabled, I might as well
2166 * add an entry for this node. Not necessary for correctness,
2167 * but if negative caching is enabled, then the system
2168 * must care about lookup caching hit rate, so...
2169 */
2170 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2171 (cnp->cn_flags & MAKEENTRY) &&
2172 attrflag != 0 && dattrflag != 0)
2173 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
2174 &dnfsva.na_ctime);
2175 *ap->a_vpp = newvp;
2176 }
2177 return (error);
2178 }
2179
2180 /*
2181 * nfs remove directory call
2182 */
2183 static int
2184 nfs_rmdir(struct vop_rmdir_args *ap)
2185 {
2186 struct vnode *vp = ap->a_vp;
2187 struct vnode *dvp = ap->a_dvp;
2188 struct componentname *cnp = ap->a_cnp;
2189 struct nfsnode *dnp;
2190 struct nfsvattr dnfsva;
2191 int error, dattrflag;
2192
2193 if (dvp == vp)
2194 return (EINVAL);
2195 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2196 cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL);
2197 dnp = VTONFS(dvp);
2198 mtx_lock(&dnp->n_mtx);
2199 dnp->n_flag |= NMODIFIED;
2200 if (dattrflag != 0) {
2201 mtx_unlock(&dnp->n_mtx);
2202 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2203 } else {
2204 dnp->n_attrstamp = 0;
2205 mtx_unlock(&dnp->n_mtx);
2206 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2207 }
2208
2209 cache_purge(dvp);
2210 cache_purge(vp);
2211 if (error && NFS_ISV4(dvp))
2212 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0,
2213 (gid_t)0);
2214 /*
2215 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
2216 */
2217 if (error == ENOENT)
2218 error = 0;
2219 return (error);
2220 }
2221
2222 /*
2223 * nfs readdir call
2224 */
2225 static int
2226 nfs_readdir(struct vop_readdir_args *ap)
2227 {
2228 struct vnode *vp = ap->a_vp;
2229 struct nfsnode *np = VTONFS(vp);
2230 struct uio *uio = ap->a_uio;
2231 ssize_t tresid;
2232 int error = 0;
2233 struct vattr vattr;
2234
2235 if (ap->a_eofflag != NULL)
2236 *ap->a_eofflag = 0;
2237 if (vp->v_type != VDIR)
2238 return(EPERM);
2239
2240 /*
2241 * First, check for hit on the EOF offset cache
2242 */
2243 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
2244 (np->n_flag & NMODIFIED) == 0) {
2245 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
2246 mtx_lock(&np->n_mtx);
2247 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
2248 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
2249 mtx_unlock(&np->n_mtx);
2250 NFSINCRGLOBAL(newnfsstats.direofcache_hits);
2251 if (ap->a_eofflag != NULL)
2252 *ap->a_eofflag = 1;
2253 return (0);
2254 } else
2255 mtx_unlock(&np->n_mtx);
2256 }
2257 }
2258
2259 /*
2260 * Call ncl_bioread() to do the real work.
2261 */
2262 tresid = uio->uio_resid;
2263 error = ncl_bioread(vp, uio, 0, ap->a_cred);
2264
2265 if (!error && uio->uio_resid == tresid) {
2266 NFSINCRGLOBAL(newnfsstats.direofcache_misses);
2267 if (ap->a_eofflag != NULL)
2268 *ap->a_eofflag = 1;
2269 }
2270 return (error);
2271 }
2272
2273 /*
2274 * Readdir rpc call.
2275 * Called from below the buffer cache by ncl_doio().
2276 */
2277 int
2278 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2279 struct thread *td)
2280 {
2281 struct nfsvattr nfsva;
2282 nfsuint64 *cookiep, cookie;
2283 struct nfsnode *dnp = VTONFS(vp);
2284 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2285 int error = 0, eof, attrflag;
2286
2287 KASSERT(uiop->uio_iovcnt == 1 &&
2288 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2289 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2290 ("nfs readdirrpc bad uio"));
2291
2292 /*
2293 * If there is no cookie, assume directory was stale.
2294 */
2295 ncl_dircookie_lock(dnp);
2296 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2297 if (cookiep) {
2298 cookie = *cookiep;
2299 ncl_dircookie_unlock(dnp);
2300 } else {
2301 ncl_dircookie_unlock(dnp);
2302 return (NFSERR_BAD_COOKIE);
2303 }
2304
2305 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2306 (void)ncl_fsinfo(nmp, vp, cred, td);
2307
2308 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
2309 &attrflag, &eof, NULL);
2310 if (attrflag)
2311 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2312
2313 if (!error) {
2314 /*
2315 * We are now either at the end of the directory or have filled
2316 * the block.
2317 */
2318 if (eof)
2319 dnp->n_direofoffset = uiop->uio_offset;
2320 else {
2321 if (uiop->uio_resid > 0)
2322 ncl_printf("EEK! readdirrpc resid > 0\n");
2323 ncl_dircookie_lock(dnp);
2324 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2325 *cookiep = cookie;
2326 ncl_dircookie_unlock(dnp);
2327 }
2328 } else if (NFS_ISV4(vp)) {
2329 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2330 }
2331 return (error);
2332 }
2333
2334 /*
2335 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
2336 */
2337 int
2338 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2339 struct thread *td)
2340 {
2341 struct nfsvattr nfsva;
2342 nfsuint64 *cookiep, cookie;
2343 struct nfsnode *dnp = VTONFS(vp);
2344 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2345 int error = 0, attrflag, eof;
2346
2347 KASSERT(uiop->uio_iovcnt == 1 &&
2348 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2349 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2350 ("nfs readdirplusrpc bad uio"));
2351
2352 /*
2353 * If there is no cookie, assume directory was stale.
2354 */
2355 ncl_dircookie_lock(dnp);
2356 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2357 if (cookiep) {
2358 cookie = *cookiep;
2359 ncl_dircookie_unlock(dnp);
2360 } else {
2361 ncl_dircookie_unlock(dnp);
2362 return (NFSERR_BAD_COOKIE);
2363 }
2364
2365 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2366 (void)ncl_fsinfo(nmp, vp, cred, td);
2367 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
2368 &attrflag, &eof, NULL);
2369 if (attrflag)
2370 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1);
2371
2372 if (!error) {
2373 /*
2374 * We are now either at end of the directory or have filled the
2375 * the block.
2376 */
2377 if (eof)
2378 dnp->n_direofoffset = uiop->uio_offset;
2379 else {
2380 if (uiop->uio_resid > 0)
2381 ncl_printf("EEK! readdirplusrpc resid > 0\n");
2382 ncl_dircookie_lock(dnp);
2383 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2384 *cookiep = cookie;
2385 ncl_dircookie_unlock(dnp);
2386 }
2387 } else if (NFS_ISV4(vp)) {
2388 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2389 }
2390 return (error);
2391 }
2392
2393 /*
2394 * Silly rename. To make the NFS filesystem that is stateless look a little
2395 * more like the "ufs" a remove of an active vnode is translated to a rename
2396 * to a funny looking filename that is removed by nfs_inactive on the
2397 * nfsnode. There is the potential for another process on a different client
2398 * to create the same funny name between the nfs_lookitup() fails and the
2399 * nfs_rename() completes, but...
2400 */
2401 static int
2402 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
2403 {
2404 struct sillyrename *sp;
2405 struct nfsnode *np;
2406 int error;
2407 short pid;
2408 unsigned int lticks;
2409
2410 cache_purge(dvp);
2411 np = VTONFS(vp);
2412 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
2413 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
2414 M_NEWNFSREQ, M_WAITOK);
2415 sp->s_cred = crhold(cnp->cn_cred);
2416 sp->s_dvp = dvp;
2417 VREF(dvp);
2418
2419 /*
2420 * Fudge together a funny name.
2421 * Changing the format of the funny name to accomodate more
2422 * sillynames per directory.
2423 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is
2424 * CPU ticks since boot.
2425 */
2426 pid = cnp->cn_thread->td_proc->p_pid;
2427 lticks = (unsigned int)ticks;
2428 for ( ; ; ) {
2429 sp->s_namlen = sprintf(sp->s_name,
2430 ".nfs.%08x.%04x4.4", lticks,
2431 pid);
2432 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2433 cnp->cn_thread, NULL))
2434 break;
2435 lticks++;
2436 }
2437 error = nfs_renameit(dvp, vp, cnp, sp);
2438 if (error)
2439 goto bad;
2440 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2441 cnp->cn_thread, &np);
2442 np->n_sillyrename = sp;
2443 return (0);
2444 bad:
2445 vrele(sp->s_dvp);
2446 crfree(sp->s_cred);
2447 free((caddr_t)sp, M_NEWNFSREQ);
2448 return (error);
2449 }
2450
2451 /*
2452 * Look up a file name and optionally either update the file handle or
2453 * allocate an nfsnode, depending on the value of npp.
2454 * npp == NULL --> just do the lookup
2455 * *npp == NULL --> allocate a new nfsnode and make sure attributes are
2456 * handled too
2457 * *npp != NULL --> update the file handle in the vnode
2458 */
2459 static int
2460 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
2461 struct thread *td, struct nfsnode **npp)
2462 {
2463 struct vnode *newvp = NULL, *vp;
2464 struct nfsnode *np, *dnp = VTONFS(dvp);
2465 struct nfsfh *nfhp, *onfhp;
2466 struct nfsvattr nfsva, dnfsva;
2467 struct componentname cn;
2468 int error = 0, attrflag, dattrflag;
2469 u_int hash;
2470
2471 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
2472 &nfhp, &attrflag, &dattrflag, NULL);
2473 if (dattrflag)
2474 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1);
2475 if (npp && !error) {
2476 if (*npp != NULL) {
2477 np = *npp;
2478 vp = NFSTOV(np);
2479 /*
2480 * For NFSv4, check to see if it is the same name and
2481 * replace the name, if it is different.
2482 */
2483 if (np->n_v4 != NULL && nfsva.na_type == VREG &&
2484 (np->n_v4->n4_namelen != len ||
2485 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
2486 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
2487 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2488 dnp->n_fhp->nfh_len))) {
2489 #ifdef notdef
2490 { char nnn[100]; int nnnl;
2491 nnnl = (len < 100) ? len : 99;
2492 bcopy(name, nnn, nnnl);
2493 nnn[nnnl] = '\0';
2494 printf("replace=%s\n",nnn);
2495 }
2496 #endif
2497 FREE((caddr_t)np->n_v4, M_NFSV4NODE);
2498 MALLOC(np->n_v4, struct nfsv4node *,
2499 sizeof (struct nfsv4node) +
2500 dnp->n_fhp->nfh_len + len - 1,
2501 M_NFSV4NODE, M_WAITOK);
2502 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
2503 np->n_v4->n4_namelen = len;
2504 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2505 dnp->n_fhp->nfh_len);
2506 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
2507 }
2508 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
2509 FNV1_32_INIT);
2510 onfhp = np->n_fhp;
2511 /*
2512 * Rehash node for new file handle.
2513 */
2514 vfs_hash_rehash(vp, hash);
2515 np->n_fhp = nfhp;
2516 if (onfhp != NULL)
2517 FREE((caddr_t)onfhp, M_NFSFH);
2518 newvp = NFSTOV(np);
2519 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
2520 FREE((caddr_t)nfhp, M_NFSFH);
2521 VREF(dvp);
2522 newvp = dvp;
2523 } else {
2524 cn.cn_nameptr = name;
2525 cn.cn_namelen = len;
2526 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
2527 &np, NULL, LK_EXCLUSIVE);
2528 if (error)
2529 return (error);
2530 newvp = NFSTOV(np);
2531 }
2532 if (!attrflag && *npp == NULL) {
2533 if (newvp == dvp)
2534 vrele(newvp);
2535 else
2536 vput(newvp);
2537 return (ENOENT);
2538 }
2539 if (attrflag)
2540 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL,
2541 0, 1);
2542 }
2543 if (npp && *npp == NULL) {
2544 if (error) {
2545 if (newvp) {
2546 if (newvp == dvp)
2547 vrele(newvp);
2548 else
2549 vput(newvp);
2550 }
2551 } else
2552 *npp = np;
2553 }
2554 if (error && NFS_ISV4(dvp))
2555 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2556 return (error);
2557 }
2558
2559 /*
2560 * Nfs Version 3 and 4 commit rpc
2561 */
2562 int
2563 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
2564 struct thread *td)
2565 {
2566 struct nfsvattr nfsva;
2567 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2568 int error, attrflag;
2569
2570 mtx_lock(&nmp->nm_mtx);
2571 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
2572 mtx_unlock(&nmp->nm_mtx);
2573 return (0);
2574 }
2575 mtx_unlock(&nmp->nm_mtx);
2576 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva,
2577 &attrflag, NULL);
2578 if (attrflag != 0)
2579 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL,
2580 0, 1);
2581 if (error != 0 && NFS_ISV4(vp))
2582 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2583 return (error);
2584 }
2585
2586 /*
2587 * Strategy routine.
2588 * For async requests when nfsiod(s) are running, queue the request by
2589 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
2590 * request.
2591 */
2592 static int
2593 nfs_strategy(struct vop_strategy_args *ap)
2594 {
2595 struct buf *bp = ap->a_bp;
2596 struct ucred *cr;
2597
2598 KASSERT(!(bp->b_flags & B_DONE),
2599 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
2600 BUF_ASSERT_HELD(bp);
2601
2602 if (bp->b_iocmd == BIO_READ)
2603 cr = bp->b_rcred;
2604 else
2605 cr = bp->b_wcred;
2606
2607 /*
2608 * If the op is asynchronous and an i/o daemon is waiting
2609 * queue the request, wake it up and wait for completion
2610 * otherwise just do it ourselves.
2611 */
2612 if ((bp->b_flags & B_ASYNC) == 0 ||
2613 ncl_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
2614 (void) ncl_doio(ap->a_vp, bp, cr, curthread, 1);
2615 return (0);
2616 }
2617
2618 /*
2619 * fsync vnode op. Just call ncl_flush() with commit == 1.
2620 */
2621 /* ARGSUSED */
2622 static int
2623 nfs_fsync(struct vop_fsync_args *ap)
2624 {
2625
2626 if (ap->a_vp->v_type != VREG) {
2627 /*
2628 * For NFS, metadata is changed synchronously on the server,
2629 * so there is nothing to flush. Also, ncl_flush() clears
2630 * the NMODIFIED flag and that shouldn't be done here for
2631 * directories.
2632 */
2633 return (0);
2634 }
2635 return (ncl_flush(ap->a_vp, ap->a_waitfor, NULL, ap->a_td, 1, 0));
2636 }
2637
2638 /*
2639 * Flush all the blocks associated with a vnode.
2640 * Walk through the buffer pool and push any dirty pages
2641 * associated with the vnode.
2642 * If the called_from_renewthread argument is TRUE, it has been called
2643 * from the NFSv4 renew thread and, as such, cannot block indefinitely
2644 * waiting for a buffer write to complete.
2645 */
2646 int
2647 ncl_flush(struct vnode *vp, int waitfor, struct ucred *cred, struct thread *td,
2648 int commit, int called_from_renewthread)
2649 {
2650 struct nfsnode *np = VTONFS(vp);
2651 struct buf *bp;
2652 int i;
2653 struct buf *nbp;
2654 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2655 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
2656 int passone = 1, trycnt = 0;
2657 u_quad_t off, endoff, toff;
2658 struct ucred* wcred = NULL;
2659 struct buf **bvec = NULL;
2660 struct bufobj *bo;
2661 #ifndef NFS_COMMITBVECSIZ
2662 #define NFS_COMMITBVECSIZ 20
2663 #endif
2664 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
2665 int bvecsize = 0, bveccount;
2666
2667 if (called_from_renewthread != 0)
2668 slptimeo = hz;
2669 if (nmp->nm_flag & NFSMNT_INT)
2670 slpflag = PCATCH;
2671 if (!commit)
2672 passone = 0;
2673 bo = &vp->v_bufobj;
2674 /*
2675 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
2676 * server, but has not been committed to stable storage on the server
2677 * yet. On the first pass, the byte range is worked out and the commit
2678 * rpc is done. On the second pass, ncl_writebp() is called to do the
2679 * job.
2680 */
2681 again:
2682 off = (u_quad_t)-1;
2683 endoff = 0;
2684 bvecpos = 0;
2685 if (NFS_ISV34(vp) && commit) {
2686 if (bvec != NULL && bvec != bvec_on_stack)
2687 free(bvec, M_TEMP);
2688 /*
2689 * Count up how many buffers waiting for a commit.
2690 */
2691 bveccount = 0;
2692 BO_LOCK(bo);
2693 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2694 if (!BUF_ISLOCKED(bp) &&
2695 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
2696 == (B_DELWRI | B_NEEDCOMMIT))
2697 bveccount++;
2698 }
2699 /*
2700 * Allocate space to remember the list of bufs to commit. It is
2701 * important to use M_NOWAIT here to avoid a race with nfs_write.
2702 * If we can't get memory (for whatever reason), we will end up
2703 * committing the buffers one-by-one in the loop below.
2704 */
2705 if (bveccount > NFS_COMMITBVECSIZ) {
2706 /*
2707 * Release the vnode interlock to avoid a lock
2708 * order reversal.
2709 */
2710 BO_UNLOCK(bo);
2711 bvec = (struct buf **)
2712 malloc(bveccount * sizeof(struct buf *),
2713 M_TEMP, M_NOWAIT);
2714 BO_LOCK(bo);
2715 if (bvec == NULL) {
2716 bvec = bvec_on_stack;
2717 bvecsize = NFS_COMMITBVECSIZ;
2718 } else
2719 bvecsize = bveccount;
2720 } else {
2721 bvec = bvec_on_stack;
2722 bvecsize = NFS_COMMITBVECSIZ;
2723 }
2724 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2725 if (bvecpos >= bvecsize)
2726 break;
2727 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2728 nbp = TAILQ_NEXT(bp, b_bobufs);
2729 continue;
2730 }
2731 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
2732 (B_DELWRI | B_NEEDCOMMIT)) {
2733 BUF_UNLOCK(bp);
2734 nbp = TAILQ_NEXT(bp, b_bobufs);
2735 continue;
2736 }
2737 BO_UNLOCK(bo);
2738 bremfree(bp);
2739 /*
2740 * Work out if all buffers are using the same cred
2741 * so we can deal with them all with one commit.
2742 *
2743 * NOTE: we are not clearing B_DONE here, so we have
2744 * to do it later on in this routine if we intend to
2745 * initiate I/O on the bp.
2746 *
2747 * Note: to avoid loopback deadlocks, we do not
2748 * assign b_runningbufspace.
2749 */
2750 if (wcred == NULL)
2751 wcred = bp->b_wcred;
2752 else if (wcred != bp->b_wcred)
2753 wcred = NOCRED;
2754 vfs_busy_pages(bp, 1);
2755
2756 BO_LOCK(bo);
2757 /*
2758 * bp is protected by being locked, but nbp is not
2759 * and vfs_busy_pages() may sleep. We have to
2760 * recalculate nbp.
2761 */
2762 nbp = TAILQ_NEXT(bp, b_bobufs);
2763
2764 /*
2765 * A list of these buffers is kept so that the
2766 * second loop knows which buffers have actually
2767 * been committed. This is necessary, since there
2768 * may be a race between the commit rpc and new
2769 * uncommitted writes on the file.
2770 */
2771 bvec[bvecpos++] = bp;
2772 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
2773 bp->b_dirtyoff;
2774 if (toff < off)
2775 off = toff;
2776 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
2777 if (toff > endoff)
2778 endoff = toff;
2779 }
2780 BO_UNLOCK(bo);
2781 }
2782 if (bvecpos > 0) {
2783 /*
2784 * Commit data on the server, as required.
2785 * If all bufs are using the same wcred, then use that with
2786 * one call for all of them, otherwise commit each one
2787 * separately.
2788 */
2789 if (wcred != NOCRED)
2790 retv = ncl_commit(vp, off, (int)(endoff - off),
2791 wcred, td);
2792 else {
2793 retv = 0;
2794 for (i = 0; i < bvecpos; i++) {
2795 off_t off, size;
2796 bp = bvec[i];
2797 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
2798 bp->b_dirtyoff;
2799 size = (u_quad_t)(bp->b_dirtyend
2800 - bp->b_dirtyoff);
2801 retv = ncl_commit(vp, off, (int)size,
2802 bp->b_wcred, td);
2803 if (retv) break;
2804 }
2805 }
2806
2807 if (retv == NFSERR_STALEWRITEVERF)
2808 ncl_clearcommit(vp->v_mount);
2809
2810 /*
2811 * Now, either mark the blocks I/O done or mark the
2812 * blocks dirty, depending on whether the commit
2813 * succeeded.
2814 */
2815 for (i = 0; i < bvecpos; i++) {
2816 bp = bvec[i];
2817 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
2818 if (retv) {
2819 /*
2820 * Error, leave B_DELWRI intact
2821 */
2822 vfs_unbusy_pages(bp);
2823 brelse(bp);
2824 } else {
2825 /*
2826 * Success, remove B_DELWRI ( bundirty() ).
2827 *
2828 * b_dirtyoff/b_dirtyend seem to be NFS
2829 * specific. We should probably move that
2830 * into bundirty(). XXX
2831 */
2832 bufobj_wref(bo);
2833 bp->b_flags |= B_ASYNC;
2834 bundirty(bp);
2835 bp->b_flags &= ~B_DONE;
2836 bp->b_ioflags &= ~BIO_ERROR;
2837 bp->b_dirtyoff = bp->b_dirtyend = 0;
2838 bufdone(bp);
2839 }
2840 }
2841 }
2842
2843 /*
2844 * Start/do any write(s) that are required.
2845 */
2846 loop:
2847 BO_LOCK(bo);
2848 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2849 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2850 if (waitfor != MNT_WAIT || passone)
2851 continue;
2852
2853 error = BUF_TIMELOCK(bp,
2854 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
2855 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo);
2856 if (error == 0) {
2857 BUF_UNLOCK(bp);
2858 goto loop;
2859 }
2860 if (error == ENOLCK) {
2861 error = 0;
2862 goto loop;
2863 }
2864 if (called_from_renewthread != 0) {
2865 /*
2866 * Return EIO so the flush will be retried
2867 * later.
2868 */
2869 error = EIO;
2870 goto done;
2871 }
2872 if (newnfs_sigintr(nmp, td)) {
2873 error = EINTR;
2874 goto done;
2875 }
2876 if (slpflag == PCATCH) {
2877 slpflag = 0;
2878 slptimeo = 2 * hz;
2879 }
2880 goto loop;
2881 }
2882 if ((bp->b_flags & B_DELWRI) == 0)
2883 panic("nfs_fsync: not dirty");
2884 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
2885 BUF_UNLOCK(bp);
2886 continue;
2887 }
2888 BO_UNLOCK(bo);
2889 bremfree(bp);
2890 if (passone || !commit)
2891 bp->b_flags |= B_ASYNC;
2892 else
2893 bp->b_flags |= B_ASYNC;
2894 bwrite(bp);
2895 if (newnfs_sigintr(nmp, td)) {
2896 error = EINTR;
2897 goto done;
2898 }
2899 goto loop;
2900 }
2901 if (passone) {
2902 passone = 0;
2903 BO_UNLOCK(bo);
2904 goto again;
2905 }
2906 if (waitfor == MNT_WAIT) {
2907 while (bo->bo_numoutput) {
2908 error = bufobj_wwait(bo, slpflag, slptimeo);
2909 if (error) {
2910 BO_UNLOCK(bo);
2911 if (called_from_renewthread != 0) {
2912 /*
2913 * Return EIO so that the flush will be
2914 * retried later.
2915 */
2916 error = EIO;
2917 goto done;
2918 }
2919 error = newnfs_sigintr(nmp, td);
2920 if (error)
2921 goto done;
2922 if (slpflag == PCATCH) {
2923 slpflag = 0;
2924 slptimeo = 2 * hz;
2925 }
2926 BO_LOCK(bo);
2927 }
2928 }
2929 if (bo->bo_dirty.bv_cnt != 0 && commit) {
2930 BO_UNLOCK(bo);
2931 goto loop;
2932 }
2933 /*
2934 * Wait for all the async IO requests to drain
2935 */
2936 BO_UNLOCK(bo);
2937 mtx_lock(&np->n_mtx);
2938 while (np->n_directio_asyncwr > 0) {
2939 np->n_flag |= NFSYNCWAIT;
2940 error = newnfs_msleep(td, &np->n_directio_asyncwr,
2941 &np->n_mtx, slpflag | (PRIBIO + 1),
2942 "nfsfsync", 0);
2943 if (error) {
2944 if (newnfs_sigintr(nmp, td)) {
2945 mtx_unlock(&np->n_mtx);
2946 error = EINTR;
2947 goto done;
2948 }
2949 }
2950 }
2951 mtx_unlock(&np->n_mtx);
2952 } else
2953 BO_UNLOCK(bo);
2954 if (NFSHASPNFS(nmp)) {
2955 nfscl_layoutcommit(vp, td);
2956 /*
2957 * Invalidate the attribute cache, since writes to a DS
2958 * won't update the size attribute.
2959 */
2960 mtx_lock(&np->n_mtx);
2961 np->n_attrstamp = 0;
2962 } else
2963 mtx_lock(&np->n_mtx);
2964 if (np->n_flag & NWRITEERR) {
2965 error = np->n_error;
2966 np->n_flag &= ~NWRITEERR;
2967 }
2968 if (commit && bo->bo_dirty.bv_cnt == 0 &&
2969 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0)
2970 np->n_flag &= ~NMODIFIED;
2971 mtx_unlock(&np->n_mtx);
2972 done:
2973 if (bvec != NULL && bvec != bvec_on_stack)
2974 free(bvec, M_TEMP);
2975 if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
2976 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 ||
2977 np->n_directio_asyncwr != 0) && trycnt++ < 5) {
2978 /* try, try again... */
2979 passone = 1;
2980 wcred = NULL;
2981 bvec = NULL;
2982 bvecsize = 0;
2983 printf("try%d\n", trycnt);
2984 goto again;
2985 }
2986 return (error);
2987 }
2988
2989 /*
2990 * NFS advisory byte-level locks.
2991 */
2992 static int
2993 nfs_advlock(struct vop_advlock_args *ap)
2994 {
2995 struct vnode *vp = ap->a_vp;
2996 struct ucred *cred;
2997 struct nfsnode *np = VTONFS(ap->a_vp);
2998 struct proc *p = (struct proc *)ap->a_id;
2999 struct thread *td = curthread; /* XXX */
3000 struct vattr va;
3001 int ret, error = EOPNOTSUPP;
3002 u_quad_t size;
3003
3004 if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
3005 if (vp->v_type != VREG)
3006 return (EINVAL);
3007 if ((ap->a_flags & F_POSIX) != 0)
3008 cred = p->p_ucred;
3009 else
3010 cred = td->td_ucred;
3011 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
3012 if (vp->v_iflag & VI_DOOMED) {
3013 NFSVOPUNLOCK(vp, 0);
3014 return (EBADF);
3015 }
3016
3017 /*
3018 * If this is unlocking a write locked region, flush and
3019 * commit them before unlocking. This is required by
3020 * RFC3530 Sec. 9.3.2.
3021 */
3022 if (ap->a_op == F_UNLCK &&
3023 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
3024 ap->a_flags))
3025 (void) ncl_flush(vp, MNT_WAIT, cred, td, 1, 0);
3026
3027 /*
3028 * Loop around doing the lock op, while a blocking lock
3029 * must wait for the lock op to succeed.
3030 */
3031 do {
3032 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
3033 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
3034 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3035 ap->a_op == F_SETLK) {
3036 NFSVOPUNLOCK(vp, 0);
3037 error = nfs_catnap(PZERO | PCATCH, ret,
3038 "ncladvl");
3039 if (error)
3040 return (EINTR);
3041 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
3042 if (vp->v_iflag & VI_DOOMED) {
3043 NFSVOPUNLOCK(vp, 0);
3044 return (EBADF);
3045 }
3046 }
3047 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3048 ap->a_op == F_SETLK);
3049 if (ret == NFSERR_DENIED) {
3050 NFSVOPUNLOCK(vp, 0);
3051 return (EAGAIN);
3052 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
3053 NFSVOPUNLOCK(vp, 0);
3054 return (ret);
3055 } else if (ret != 0) {
3056 NFSVOPUNLOCK(vp, 0);
3057 return (EACCES);
3058 }
3059
3060 /*
3061 * Now, if we just got a lock, invalidate data in the buffer
3062 * cache, as required, so that the coherency conforms with
3063 * RFC3530 Sec. 9.3.2.
3064 */
3065 if (ap->a_op == F_SETLK) {
3066 if ((np->n_flag & NMODIFIED) == 0) {
3067 np->n_attrstamp = 0;
3068 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3069 ret = VOP_GETATTR(vp, &va, cred);
3070 }
3071 if ((np->n_flag & NMODIFIED) || ret ||
3072 np->n_change != va.va_filerev) {
3073 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
3074 np->n_attrstamp = 0;
3075 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3076 ret = VOP_GETATTR(vp, &va, cred);
3077 if (!ret) {
3078 np->n_mtime = va.va_mtime;
3079 np->n_change = va.va_filerev;
3080 }
3081 }
3082 }
3083 NFSVOPUNLOCK(vp, 0);
3084 return (0);
3085 } else if (!NFS_ISV4(vp)) {
3086 error = NFSVOPLOCK(vp, LK_SHARED);
3087 if (error)
3088 return (error);
3089 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
3090 size = VTONFS(vp)->n_size;
3091 NFSVOPUNLOCK(vp, 0);
3092 error = lf_advlock(ap, &(vp->v_lockf), size);
3093 } else {
3094 if (nfs_advlock_p != NULL)
3095 error = nfs_advlock_p(ap);
3096 else {
3097 NFSVOPUNLOCK(vp, 0);
3098 error = ENOLCK;
3099 }
3100 }
3101 }
3102 return (error);
3103 }
3104
3105 /*
3106 * NFS advisory byte-level locks.
3107 */
3108 static int
3109 nfs_advlockasync(struct vop_advlockasync_args *ap)
3110 {
3111 struct vnode *vp = ap->a_vp;
3112 u_quad_t size;
3113 int error;
3114
3115 if (NFS_ISV4(vp))
3116 return (EOPNOTSUPP);
3117 error = NFSVOPLOCK(vp, LK_SHARED);
3118 if (error)
3119 return (error);
3120 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
3121 size = VTONFS(vp)->n_size;
3122 NFSVOPUNLOCK(vp, 0);
3123 error = lf_advlockasync(ap, &(vp->v_lockf), size);
3124 } else {
3125 NFSVOPUNLOCK(vp, 0);
3126 error = EOPNOTSUPP;
3127 }
3128 return (error);
3129 }
3130
3131 /*
3132 * Print out the contents of an nfsnode.
3133 */
3134 static int
3135 nfs_print(struct vop_print_args *ap)
3136 {
3137 struct vnode *vp = ap->a_vp;
3138 struct nfsnode *np = VTONFS(vp);
3139
3140 ncl_printf("\tfileid %ld fsid 0x%x",
3141 np->n_vattr.na_fileid, np->n_vattr.na_fsid);
3142 if (vp->v_type == VFIFO)
3143 fifo_printinfo(vp);
3144 printf("\n");
3145 return (0);
3146 }
3147
3148 /*
3149 * This is the "real" nfs::bwrite(struct buf*).
3150 * We set B_CACHE if this is a VMIO buffer.
3151 */
3152 int
3153 ncl_writebp(struct buf *bp, int force __unused, struct thread *td)
3154 {
3155 int s;
3156 int oldflags = bp->b_flags;
3157 #if 0
3158 int retv = 1;
3159 off_t off;
3160 #endif
3161
3162 BUF_ASSERT_HELD(bp);
3163
3164 if (bp->b_flags & B_INVAL) {
3165 brelse(bp);
3166 return(0);
3167 }
3168
3169 bp->b_flags |= B_CACHE;
3170
3171 /*
3172 * Undirty the bp. We will redirty it later if the I/O fails.
3173 */
3174
3175 s = splbio();
3176 bundirty(bp);
3177 bp->b_flags &= ~B_DONE;
3178 bp->b_ioflags &= ~BIO_ERROR;
3179 bp->b_iocmd = BIO_WRITE;
3180
3181 bufobj_wref(bp->b_bufobj);
3182 curthread->td_ru.ru_oublock++;
3183 splx(s);
3184
3185 /*
3186 * Note: to avoid loopback deadlocks, we do not
3187 * assign b_runningbufspace.
3188 */
3189 vfs_busy_pages(bp, 1);
3190
3191 BUF_KERNPROC(bp);
3192 bp->b_iooffset = dbtob(bp->b_blkno);
3193 bstrategy(bp);
3194
3195 if( (oldflags & B_ASYNC) == 0) {
3196 int rtval = bufwait(bp);
3197
3198 if (oldflags & B_DELWRI) {
3199 s = splbio();
3200 reassignbuf(bp);
3201 splx(s);
3202 }
3203 brelse(bp);
3204 return (rtval);
3205 }
3206
3207 return (0);
3208 }
3209
3210 /*
3211 * nfs special file access vnode op.
3212 * Essentially just get vattr and then imitate iaccess() since the device is
3213 * local to the client.
3214 */
3215 static int
3216 nfsspec_access(struct vop_access_args *ap)
3217 {
3218 struct vattr *vap;
3219 struct ucred *cred = ap->a_cred;
3220 struct vnode *vp = ap->a_vp;
3221 accmode_t accmode = ap->a_accmode;
3222 struct vattr vattr;
3223 int error;
3224
3225 /*
3226 * Disallow write attempts on filesystems mounted read-only;
3227 * unless the file is a socket, fifo, or a block or character
3228 * device resident on the filesystem.
3229 */
3230 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
3231 switch (vp->v_type) {
3232 case VREG:
3233 case VDIR:
3234 case VLNK:
3235 return (EROFS);
3236 default:
3237 break;
3238 }
3239 }
3240 vap = &vattr;
3241 error = VOP_GETATTR(vp, vap, cred);
3242 if (error)
3243 goto out;
3244 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
3245 accmode, cred, NULL);
3246 out:
3247 return error;
3248 }
3249
3250 /*
3251 * Read wrapper for fifos.
3252 */
3253 static int
3254 nfsfifo_read(struct vop_read_args *ap)
3255 {
3256 struct nfsnode *np = VTONFS(ap->a_vp);
3257 int error;
3258
3259 /*
3260 * Set access flag.
3261 */
3262 mtx_lock(&np->n_mtx);
3263 np->n_flag |= NACC;
3264 vfs_timestamp(&np->n_atim);
3265 mtx_unlock(&np->n_mtx);
3266 error = fifo_specops.vop_read(ap);
3267 return error;
3268 }
3269
3270 /*
3271 * Write wrapper for fifos.
3272 */
3273 static int
3274 nfsfifo_write(struct vop_write_args *ap)
3275 {
3276 struct nfsnode *np = VTONFS(ap->a_vp);
3277
3278 /*
3279 * Set update flag.
3280 */
3281 mtx_lock(&np->n_mtx);
3282 np->n_flag |= NUPD;
3283 vfs_timestamp(&np->n_mtim);
3284 mtx_unlock(&np->n_mtx);
3285 return(fifo_specops.vop_write(ap));
3286 }
3287
3288 /*
3289 * Close wrapper for fifos.
3290 *
3291 * Update the times on the nfsnode then do fifo close.
3292 */
3293 static int
3294 nfsfifo_close(struct vop_close_args *ap)
3295 {
3296 struct vnode *vp = ap->a_vp;
3297 struct nfsnode *np = VTONFS(vp);
3298 struct vattr vattr;
3299 struct timespec ts;
3300
3301 mtx_lock(&np->n_mtx);
3302 if (np->n_flag & (NACC | NUPD)) {
3303 vfs_timestamp(&ts);
3304 if (np->n_flag & NACC)
3305 np->n_atim = ts;
3306 if (np->n_flag & NUPD)
3307 np->n_mtim = ts;
3308 np->n_flag |= NCHG;
3309 if (vrefcnt(vp) == 1 &&
3310 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
3311 VATTR_NULL(&vattr);
3312 if (np->n_flag & NACC)
3313 vattr.va_atime = np->n_atim;
3314 if (np->n_flag & NUPD)
3315 vattr.va_mtime = np->n_mtim;
3316 mtx_unlock(&np->n_mtx);
3317 (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
3318 goto out;
3319 }
3320 }
3321 mtx_unlock(&np->n_mtx);
3322 out:
3323 return (fifo_specops.vop_close(ap));
3324 }
3325
3326 /*
3327 * Just call ncl_writebp() with the force argument set to 1.
3328 *
3329 * NOTE: B_DONE may or may not be set in a_bp on call.
3330 */
3331 static int
3332 nfs_bwrite(struct buf *bp)
3333 {
3334
3335 return (ncl_writebp(bp, 1, curthread));
3336 }
3337
3338 struct buf_ops buf_ops_newnfs = {
3339 .bop_name = "buf_ops_nfs",
3340 .bop_write = nfs_bwrite,
3341 .bop_strategy = bufstrategy,
3342 .bop_sync = bufsync,
3343 .bop_bdflush = bufbdflush,
3344 };
3345
3346 /*
3347 * Cloned from vop_stdlock(), and then the ugly hack added.
3348 */
3349 static int
3350 nfs_lock1(struct vop_lock1_args *ap)
3351 {
3352 struct vnode *vp = ap->a_vp;
3353 int error = 0;
3354
3355 /*
3356 * Since vfs_hash_get() calls vget() and it will no longer work
3357 * for FreeBSD8 with flags == 0, I can only think of this horrible
3358 * hack to work around it. I call vfs_hash_get() with LK_EXCLOTHER
3359 * and then handle it here. All I want for this case is a v_usecount
3360 * on the vnode to use for recovery, while another thread might
3361 * hold a lock on the vnode. I have the other threads blocked, so
3362 * there isn't any race problem.
3363 */
3364 if ((ap->a_flags & LK_TYPE_MASK) == LK_EXCLOTHER) {
3365 if ((ap->a_flags & LK_INTERLOCK) == 0)
3366 panic("ncllock1");
3367 if ((vp->v_iflag & VI_DOOMED))
3368 error = ENOENT;
3369 VI_UNLOCK(vp);
3370 return (error);
3371 }
3372 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp),
3373 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file,
3374 ap->a_line));
3375 }
3376
3377 static int
3378 nfs_getacl(struct vop_getacl_args *ap)
3379 {
3380 int error;
3381
3382 if (ap->a_type != ACL_TYPE_NFS4)
3383 return (EOPNOTSUPP);
3384 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
3385 NULL);
3386 if (error > NFSERR_STALE) {
3387 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3388 error = EPERM;
3389 }
3390 return (error);
3391 }
3392
3393 static int
3394 nfs_setacl(struct vop_setacl_args *ap)
3395 {
3396 int error;
3397
3398 if (ap->a_type != ACL_TYPE_NFS4)
3399 return (EOPNOTSUPP);
3400 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp,
3401 NULL);
3402 if (error > NFSERR_STALE) {
3403 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3404 error = EPERM;
3405 }
3406 return (error);
3407 }
3408
3409 /*
3410 * Return POSIX pathconf information applicable to nfs filesystems.
3411 */
3412 static int
3413 nfs_pathconf(struct vop_pathconf_args *ap)
3414 {
3415 struct nfsv3_pathconf pc;
3416 struct nfsvattr nfsva;
3417 struct vnode *vp = ap->a_vp;
3418 struct thread *td = curthread;
3419 int attrflag, error;
3420
3421 if (NFS_ISV4(vp) || (NFS_ISV3(vp) && (ap->a_name == _PC_LINK_MAX ||
3422 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
3423 ap->a_name == _PC_NO_TRUNC))) {
3424 /*
3425 * Since only the above 4 a_names are returned by the NFSv3
3426 * Pathconf RPC, there is no point in doing it for others.
3427 */
3428 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva,
3429 &attrflag, NULL);
3430 if (attrflag != 0)
3431 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0,
3432 1);
3433 if (error != 0)
3434 return (error);
3435 } else {
3436 /*
3437 * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
3438 * just fake them.
3439 */
3440 pc.pc_linkmax = LINK_MAX;
3441 pc.pc_namemax = NFS_MAXNAMLEN;
3442 pc.pc_notrunc = 1;
3443 pc.pc_chownrestricted = 1;
3444 pc.pc_caseinsensitive = 0;
3445 pc.pc_casepreserving = 1;
3446 error = 0;
3447 }
3448 switch (ap->a_name) {
3449 case _PC_LINK_MAX:
3450 *ap->a_retval = pc.pc_linkmax;
3451 break;
3452 case _PC_NAME_MAX:
3453 *ap->a_retval = pc.pc_namemax;
3454 break;
3455 case _PC_PATH_MAX:
3456 *ap->a_retval = PATH_MAX;
3457 break;
3458 case _PC_PIPE_BUF:
3459 *ap->a_retval = PIPE_BUF;
3460 break;
3461 case _PC_CHOWN_RESTRICTED:
3462 *ap->a_retval = pc.pc_chownrestricted;
3463 break;
3464 case _PC_NO_TRUNC:
3465 *ap->a_retval = pc.pc_notrunc;
3466 break;
3467 case _PC_ACL_EXTENDED:
3468 *ap->a_retval = 0;
3469 break;
3470 case _PC_ACL_NFS4:
3471 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
3472 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
3473 *ap->a_retval = 1;
3474 else
3475 *ap->a_retval = 0;
3476 break;
3477 case _PC_ACL_PATH_MAX:
3478 if (NFS_ISV4(vp))
3479 *ap->a_retval = ACL_MAX_ENTRIES;
3480 else
3481 *ap->a_retval = 3;
3482 break;
3483 case _PC_MAC_PRESENT:
3484 *ap->a_retval = 0;
3485 break;
3486 case _PC_ASYNC_IO:
3487 /* _PC_ASYNC_IO should have been handled by upper layers. */
3488 KASSERT(0, ("_PC_ASYNC_IO should not get here"));
3489 error = EINVAL;
3490 break;
3491 case _PC_PRIO_IO:
3492 *ap->a_retval = 0;
3493 break;
3494 case _PC_SYNC_IO:
3495 *ap->a_retval = 0;
3496 break;
3497 case _PC_ALLOC_SIZE_MIN:
3498 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
3499 break;
3500 case _PC_FILESIZEBITS:
3501 if (NFS_ISV34(vp))
3502 *ap->a_retval = 64;
3503 else
3504 *ap->a_retval = 32;
3505 break;
3506 case _PC_REC_INCR_XFER_SIZE:
3507 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
3508 break;
3509 case _PC_REC_MAX_XFER_SIZE:
3510 *ap->a_retval = -1; /* means ``unlimited'' */
3511 break;
3512 case _PC_REC_MIN_XFER_SIZE:
3513 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
3514 break;
3515 case _PC_REC_XFER_ALIGN:
3516 *ap->a_retval = PAGE_SIZE;
3517 break;
3518 case _PC_SYMLINK_MAX:
3519 *ap->a_retval = NFS_MAXPATHLEN;
3520 break;
3521
3522 default:
3523 error = EINVAL;
3524 break;
3525 }
3526 return (error);
3527 }
3528
Cache object: c8bcf450b0b85b15688f0d96cb3398a6
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