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 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95
37 */
38
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD: releng/5.1/sys/nfsclient/nfs_vnops.c 115041 2003-05-15 21:12:08Z rwatson $");
41
42 /*
43 * vnode op calls for Sun NFS version 2 and 3
44 */
45
46 #include "opt_inet.h"
47
48 #include <sys/param.h>
49 #include <sys/kernel.h>
50 #include <sys/systm.h>
51 #include <sys/resourcevar.h>
52 #include <sys/proc.h>
53 #include <sys/mount.h>
54 #include <sys/bio.h>
55 #include <sys/buf.h>
56 #include <sys/malloc.h>
57 #include <sys/mbuf.h>
58 #include <sys/namei.h>
59 #include <sys/socket.h>
60 #include <sys/vnode.h>
61 #include <sys/dirent.h>
62 #include <sys/fcntl.h>
63 #include <sys/lockf.h>
64 #include <sys/stat.h>
65 #include <sys/sysctl.h>
66
67 #include <vm/vm.h>
68 #include <vm/vm_extern.h>
69
70 #include <fs/fifofs/fifo.h>
71
72 #include <nfs/rpcv2.h>
73 #include <nfs/nfsproto.h>
74 #include <nfsclient/nfs.h>
75 #include <nfsclient/nfsnode.h>
76 #include <nfsclient/nfsmount.h>
77 #include <nfsclient/nfs_lock.h>
78 #include <nfs/xdr_subs.h>
79 #include <nfsclient/nfsm_subs.h>
80
81 #include <net/if.h>
82 #include <netinet/in.h>
83 #include <netinet/in_var.h>
84
85 /* Defs */
86 #define TRUE 1
87 #define FALSE 0
88
89 /*
90 * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these
91 * calls are not in getblk() and brelse() so that they would not be necessary
92 * here.
93 */
94 #ifndef B_VMIO
95 #define vfs_busy_pages(bp, f)
96 #endif
97
98 static int nfsspec_read(struct vop_read_args *);
99 static int nfsspec_write(struct vop_write_args *);
100 static int nfsfifo_read(struct vop_read_args *);
101 static int nfsfifo_write(struct vop_write_args *);
102 static int nfsspec_close(struct vop_close_args *);
103 static int nfsfifo_close(struct vop_close_args *);
104 static int nfs_flush(struct vnode *, struct ucred *, int, struct thread *,
105 int);
106 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
107 struct thread *);
108 static int nfs_lookup(struct vop_lookup_args *);
109 static int nfs_create(struct vop_create_args *);
110 static int nfs_mknod(struct vop_mknod_args *);
111 static int nfs_open(struct vop_open_args *);
112 static int nfs_close(struct vop_close_args *);
113 static int nfs_access(struct vop_access_args *);
114 static int nfs_getattr(struct vop_getattr_args *);
115 static int nfs_setattr(struct vop_setattr_args *);
116 static int nfs_read(struct vop_read_args *);
117 static int nfs_fsync(struct vop_fsync_args *);
118 static int nfs_remove(struct vop_remove_args *);
119 static int nfs_link(struct vop_link_args *);
120 static int nfs_rename(struct vop_rename_args *);
121 static int nfs_mkdir(struct vop_mkdir_args *);
122 static int nfs_rmdir(struct vop_rmdir_args *);
123 static int nfs_symlink(struct vop_symlink_args *);
124 static int nfs_readdir(struct vop_readdir_args *);
125 static int nfs_strategy(struct vop_strategy_args *);
126 static int nfs_lookitup(struct vnode *, const char *, int,
127 struct ucred *, struct thread *, struct nfsnode **);
128 static int nfs_sillyrename(struct vnode *, struct vnode *,
129 struct componentname *);
130 static int nfsspec_access(struct vop_access_args *);
131 static int nfs_readlink(struct vop_readlink_args *);
132 static int nfs_print(struct vop_print_args *);
133 static int nfs_advlock(struct vop_advlock_args *);
134
135 /*
136 * Global vfs data structures for nfs
137 */
138 vop_t **nfsv2_vnodeop_p;
139 static struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = {
140 { &vop_default_desc, (vop_t *) vop_defaultop },
141 { &vop_access_desc, (vop_t *) nfs_access },
142 { &vop_advlock_desc, (vop_t *) nfs_advlock },
143 { &vop_close_desc, (vop_t *) nfs_close },
144 { &vop_create_desc, (vop_t *) nfs_create },
145 { &vop_fsync_desc, (vop_t *) nfs_fsync },
146 { &vop_getattr_desc, (vop_t *) nfs_getattr },
147 { &vop_getpages_desc, (vop_t *) nfs_getpages },
148 { &vop_putpages_desc, (vop_t *) nfs_putpages },
149 { &vop_inactive_desc, (vop_t *) nfs_inactive },
150 { &vop_lease_desc, (vop_t *) vop_null },
151 { &vop_link_desc, (vop_t *) nfs_link },
152 { &vop_lock_desc, (vop_t *) vop_sharedlock },
153 { &vop_lookup_desc, (vop_t *) nfs_lookup },
154 { &vop_mkdir_desc, (vop_t *) nfs_mkdir },
155 { &vop_mknod_desc, (vop_t *) nfs_mknod },
156 { &vop_open_desc, (vop_t *) nfs_open },
157 { &vop_print_desc, (vop_t *) nfs_print },
158 { &vop_read_desc, (vop_t *) nfs_read },
159 { &vop_readdir_desc, (vop_t *) nfs_readdir },
160 { &vop_readlink_desc, (vop_t *) nfs_readlink },
161 { &vop_reclaim_desc, (vop_t *) nfs_reclaim },
162 { &vop_remove_desc, (vop_t *) nfs_remove },
163 { &vop_rename_desc, (vop_t *) nfs_rename },
164 { &vop_rmdir_desc, (vop_t *) nfs_rmdir },
165 { &vop_setattr_desc, (vop_t *) nfs_setattr },
166 { &vop_strategy_desc, (vop_t *) nfs_strategy },
167 { &vop_symlink_desc, (vop_t *) nfs_symlink },
168 { &vop_write_desc, (vop_t *) nfs_write },
169 { NULL, NULL }
170 };
171 static struct vnodeopv_desc nfsv2_vnodeop_opv_desc =
172 { &nfsv2_vnodeop_p, nfsv2_vnodeop_entries };
173 VNODEOP_SET(nfsv2_vnodeop_opv_desc);
174
175 /*
176 * Special device vnode ops
177 */
178 vop_t **spec_nfsv2nodeop_p;
179 static struct vnodeopv_entry_desc nfsv2_specop_entries[] = {
180 { &vop_default_desc, (vop_t *) spec_vnoperate },
181 { &vop_access_desc, (vop_t *) nfsspec_access },
182 { &vop_close_desc, (vop_t *) nfsspec_close },
183 { &vop_fsync_desc, (vop_t *) nfs_fsync },
184 { &vop_getattr_desc, (vop_t *) nfs_getattr },
185 { &vop_inactive_desc, (vop_t *) nfs_inactive },
186 { &vop_lock_desc, (vop_t *) vop_sharedlock },
187 { &vop_print_desc, (vop_t *) nfs_print },
188 { &vop_read_desc, (vop_t *) nfsspec_read },
189 { &vop_reclaim_desc, (vop_t *) nfs_reclaim },
190 { &vop_setattr_desc, (vop_t *) nfs_setattr },
191 { &vop_write_desc, (vop_t *) nfsspec_write },
192 { NULL, NULL }
193 };
194 static struct vnodeopv_desc spec_nfsv2nodeop_opv_desc =
195 { &spec_nfsv2nodeop_p, nfsv2_specop_entries };
196 VNODEOP_SET(spec_nfsv2nodeop_opv_desc);
197
198 vop_t **fifo_nfsv2nodeop_p;
199 static struct vnodeopv_entry_desc nfsv2_fifoop_entries[] = {
200 { &vop_default_desc, (vop_t *) fifo_vnoperate },
201 { &vop_access_desc, (vop_t *) nfsspec_access },
202 { &vop_close_desc, (vop_t *) nfsfifo_close },
203 { &vop_fsync_desc, (vop_t *) nfs_fsync },
204 { &vop_getattr_desc, (vop_t *) nfs_getattr },
205 { &vop_inactive_desc, (vop_t *) nfs_inactive },
206 { &vop_lock_desc, (vop_t *) vop_sharedlock },
207 { &vop_print_desc, (vop_t *) nfs_print },
208 { &vop_read_desc, (vop_t *) nfsfifo_read },
209 { &vop_reclaim_desc, (vop_t *) nfs_reclaim },
210 { &vop_setattr_desc, (vop_t *) nfs_setattr },
211 { &vop_write_desc, (vop_t *) nfsfifo_write },
212 { NULL, NULL }
213 };
214 static struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc =
215 { &fifo_nfsv2nodeop_p, nfsv2_fifoop_entries };
216 VNODEOP_SET(fifo_nfsv2nodeop_opv_desc);
217
218 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
219 struct componentname *cnp, struct vattr *vap);
220 static int nfs_removerpc(struct vnode *dvp, const char *name, int namelen,
221 struct ucred *cred, struct thread *td);
222 static int nfs_renamerpc(struct vnode *fdvp, const char *fnameptr,
223 int fnamelen, struct vnode *tdvp,
224 const char *tnameptr, int tnamelen,
225 struct ucred *cred, struct thread *td);
226 static int nfs_renameit(struct vnode *sdvp, struct componentname *scnp,
227 struct sillyrename *sp);
228
229 /*
230 * Global variables
231 */
232 struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON];
233 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON];
234 int nfs_numasync = 0;
235 #define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1))
236
237 SYSCTL_DECL(_vfs_nfs);
238
239 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
240 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
241 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
242
243 static int nfsv3_commit_on_close = 0;
244 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW,
245 &nfsv3_commit_on_close, 0, "write+commit on close, else only write");
246 #if 0
247 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD,
248 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
249
250 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD,
251 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count");
252 #endif
253
254 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \
255 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \
256 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP)
257 static int
258 nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td,
259 struct ucred *cred)
260 {
261 const int v3 = 1;
262 u_int32_t *tl;
263 int error = 0, attrflag;
264
265 struct mbuf *mreq, *mrep, *md, *mb;
266 caddr_t bpos, dpos;
267 u_int32_t rmode;
268 struct nfsnode *np = VTONFS(vp);
269
270 nfsstats.rpccnt[NFSPROC_ACCESS]++;
271 mreq = nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED);
272 mb = mreq;
273 bpos = mtod(mb, caddr_t);
274 nfsm_fhtom(vp, v3);
275 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
276 *tl = txdr_unsigned(wmode);
277 nfsm_request(vp, NFSPROC_ACCESS, td, cred);
278 nfsm_postop_attr(vp, attrflag);
279 if (!error) {
280 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
281 rmode = fxdr_unsigned(u_int32_t, *tl);
282 np->n_mode = rmode;
283 np->n_modeuid = cred->cr_uid;
284 np->n_modestamp = time_second;
285 }
286 m_freem(mrep);
287 nfsmout:
288 return error;
289 }
290
291 /*
292 * nfs access vnode op.
293 * For nfs version 2, just return ok. File accesses may fail later.
294 * For nfs version 3, use the access rpc to check accessibility. If file modes
295 * are changed on the server, accesses might still fail later.
296 */
297 static int
298 nfs_access(struct vop_access_args *ap)
299 {
300 struct vnode *vp = ap->a_vp;
301 int error = 0;
302 u_int32_t mode, wmode;
303 int v3 = NFS_ISV3(vp);
304 struct nfsnode *np = VTONFS(vp);
305
306 /*
307 * Disallow write attempts on filesystems mounted read-only;
308 * unless the file is a socket, fifo, or a block or character
309 * device resident on the filesystem.
310 */
311 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
312 switch (vp->v_type) {
313 case VREG:
314 case VDIR:
315 case VLNK:
316 return (EROFS);
317 default:
318 break;
319 }
320 }
321 /*
322 * For nfs v3, check to see if we have done this recently, and if
323 * so return our cached result instead of making an ACCESS call.
324 * If not, do an access rpc, otherwise you are stuck emulating
325 * ufs_access() locally using the vattr. This may not be correct,
326 * since the server may apply other access criteria such as
327 * client uid-->server uid mapping that we do not know about.
328 */
329 if (v3) {
330 if (ap->a_mode & VREAD)
331 mode = NFSV3ACCESS_READ;
332 else
333 mode = 0;
334 if (vp->v_type != VDIR) {
335 if (ap->a_mode & VWRITE)
336 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND);
337 if (ap->a_mode & VEXEC)
338 mode |= NFSV3ACCESS_EXECUTE;
339 } else {
340 if (ap->a_mode & VWRITE)
341 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND |
342 NFSV3ACCESS_DELETE);
343 if (ap->a_mode & VEXEC)
344 mode |= NFSV3ACCESS_LOOKUP;
345 }
346 /* XXX safety belt, only make blanket request if caching */
347 if (nfsaccess_cache_timeout > 0) {
348 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY |
349 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE |
350 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP;
351 } else {
352 wmode = mode;
353 }
354
355 /*
356 * Does our cached result allow us to give a definite yes to
357 * this request?
358 */
359 if ((time_second < (np->n_modestamp + nfsaccess_cache_timeout)) &&
360 (ap->a_cred->cr_uid == np->n_modeuid) &&
361 ((np->n_mode & mode) == mode)) {
362 nfsstats.accesscache_hits++;
363 } else {
364 /*
365 * Either a no, or a don't know. Go to the wire.
366 */
367 nfsstats.accesscache_misses++;
368 error = nfs3_access_otw(vp, wmode, ap->a_td,ap->a_cred);
369 if (!error) {
370 if ((np->n_mode & mode) != mode) {
371 error = EACCES;
372 }
373 }
374 }
375 return (error);
376 } else {
377 if ((error = nfsspec_access(ap)) != 0)
378 return (error);
379
380 /*
381 * Attempt to prevent a mapped root from accessing a file
382 * which it shouldn't. We try to read a byte from the file
383 * if the user is root and the file is not zero length.
384 * After calling nfsspec_access, we should have the correct
385 * file size cached.
386 */
387 if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD)
388 && VTONFS(vp)->n_size > 0) {
389 struct iovec aiov;
390 struct uio auio;
391 char buf[1];
392
393 aiov.iov_base = buf;
394 aiov.iov_len = 1;
395 auio.uio_iov = &aiov;
396 auio.uio_iovcnt = 1;
397 auio.uio_offset = 0;
398 auio.uio_resid = 1;
399 auio.uio_segflg = UIO_SYSSPACE;
400 auio.uio_rw = UIO_READ;
401 auio.uio_td = ap->a_td;
402
403 if (vp->v_type == VREG)
404 error = nfs_readrpc(vp, &auio, ap->a_cred);
405 else if (vp->v_type == VDIR) {
406 char* bp;
407 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
408 aiov.iov_base = bp;
409 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
410 error = nfs_readdirrpc(vp, &auio, ap->a_cred);
411 free(bp, M_TEMP);
412 } else if (vp->v_type == VLNK)
413 error = nfs_readlinkrpc(vp, &auio, ap->a_cred);
414 else
415 error = EACCES;
416 }
417 return (error);
418 }
419 }
420
421 /*
422 * nfs open vnode op
423 * Check to see if the type is ok
424 * and that deletion is not in progress.
425 * For paged in text files, you will need to flush the page cache
426 * if consistency is lost.
427 */
428 /* ARGSUSED */
429 static int
430 nfs_open(struct vop_open_args *ap)
431 {
432 struct vnode *vp = ap->a_vp;
433 struct nfsnode *np = VTONFS(vp);
434 struct vattr vattr;
435 int error;
436
437 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) {
438 #ifdef DIAGNOSTIC
439 printf("open eacces vtyp=%d\n", vp->v_type);
440 #endif
441 return (EACCES);
442 }
443 /*
444 * Get a valid lease. If cached data is stale, flush it.
445 */
446 if (np->n_flag & NMODIFIED) {
447 if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred,
448 ap->a_td, 1)) == EINTR)
449 return (error);
450 np->n_attrstamp = 0;
451 if (vp->v_type == VDIR)
452 np->n_direofoffset = 0;
453 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td);
454 if (error)
455 return (error);
456 np->n_mtime = vattr.va_mtime.tv_sec;
457 } else {
458 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td);
459 if (error)
460 return (error);
461 if (np->n_mtime != vattr.va_mtime.tv_sec) {
462 if (vp->v_type == VDIR)
463 np->n_direofoffset = 0;
464 if ((error = nfs_vinvalbuf(vp, V_SAVE,
465 ap->a_cred, ap->a_td, 1)) == EINTR)
466 return (error);
467 np->n_mtime = vattr.va_mtime.tv_sec;
468 }
469 }
470 np->n_attrstamp = 0; /* For Open/Close consistency */
471 return (0);
472 }
473
474 /*
475 * nfs close vnode op
476 * What an NFS client should do upon close after writing is a debatable issue.
477 * Most NFS clients push delayed writes to the server upon close, basically for
478 * two reasons:
479 * 1 - So that any write errors may be reported back to the client process
480 * doing the close system call. By far the two most likely errors are
481 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
482 * 2 - To put a worst case upper bound on cache inconsistency between
483 * multiple clients for the file.
484 * There is also a consistency problem for Version 2 of the protocol w.r.t.
485 * not being able to tell if other clients are writing a file concurrently,
486 * since there is no way of knowing if the changed modify time in the reply
487 * is only due to the write for this client.
488 * (NFS Version 3 provides weak cache consistency data in the reply that
489 * should be sufficient to detect and handle this case.)
490 *
491 * The current code does the following:
492 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
493 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
494 * or commit them (this satisfies 1 and 2 except for the
495 * case where the server crashes after this close but
496 * before the commit RPC, which is felt to be "good
497 * enough". Changing the last argument to nfs_flush() to
498 * a 1 would force a commit operation, if it is felt a
499 * commit is necessary now.
500 */
501 /* ARGSUSED */
502 static int
503 nfs_close(struct vop_close_args *ap)
504 {
505 struct vnode *vp = ap->a_vp;
506 struct nfsnode *np = VTONFS(vp);
507 int error = 0;
508
509 if (vp->v_type == VREG) {
510 if (np->n_flag & NMODIFIED) {
511 if (NFS_ISV3(vp)) {
512 /*
513 * Under NFSv3 we have dirty buffers to dispose of. We
514 * must flush them to the NFS server. We have the option
515 * of waiting all the way through the commit rpc or just
516 * waiting for the initial write. The default is to only
517 * wait through the initial write so the data is in the
518 * server's cache, which is roughly similar to the state
519 * a standard disk subsystem leaves the file in on close().
520 *
521 * We cannot clear the NMODIFIED bit in np->n_flag due to
522 * potential races with other processes, and certainly
523 * cannot clear it if we don't commit.
524 */
525 int cm = nfsv3_commit_on_close ? 1 : 0;
526 error = nfs_flush(vp, ap->a_cred, MNT_WAIT, ap->a_td, cm);
527 /* np->n_flag &= ~NMODIFIED; */
528 } else {
529 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, ap->a_td);
530 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_td, 1);
531 VOP_UNLOCK(vp, 0, ap->a_td);
532 }
533 np->n_attrstamp = 0;
534 }
535 if (np->n_flag & NWRITEERR) {
536 np->n_flag &= ~NWRITEERR;
537 error = np->n_error;
538 }
539 }
540 return (error);
541 }
542
543 /*
544 * nfs getattr call from vfs.
545 */
546 static int
547 nfs_getattr(struct vop_getattr_args *ap)
548 {
549 struct vnode *vp = ap->a_vp;
550 struct nfsnode *np = VTONFS(vp);
551 caddr_t bpos, dpos;
552 int error = 0;
553 struct mbuf *mreq, *mrep, *md, *mb;
554 int v3 = NFS_ISV3(vp);
555
556 /*
557 * Update local times for special files.
558 */
559 if (np->n_flag & (NACC | NUPD))
560 np->n_flag |= NCHG;
561 /*
562 * First look in the cache.
563 */
564 if (nfs_getattrcache(vp, ap->a_vap) == 0)
565 return (0);
566
567 if (v3 && nfsaccess_cache_timeout > 0) {
568 nfsstats.accesscache_misses++;
569 nfs3_access_otw(vp, NFSV3ACCESS_ALL, ap->a_td, ap->a_cred);
570 if (nfs_getattrcache(vp, ap->a_vap) == 0)
571 return (0);
572 }
573
574 nfsstats.rpccnt[NFSPROC_GETATTR]++;
575 mreq = nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3));
576 mb = mreq;
577 bpos = mtod(mb, caddr_t);
578 nfsm_fhtom(vp, v3);
579 nfsm_request(vp, NFSPROC_GETATTR, ap->a_td, ap->a_cred);
580 if (!error) {
581 nfsm_loadattr(vp, ap->a_vap);
582 }
583 m_freem(mrep);
584 nfsmout:
585 return (error);
586 }
587
588 /*
589 * nfs setattr call.
590 */
591 static int
592 nfs_setattr(struct vop_setattr_args *ap)
593 {
594 struct vnode *vp = ap->a_vp;
595 struct nfsnode *np = VTONFS(vp);
596 struct vattr *vap = ap->a_vap;
597 int error = 0;
598 u_quad_t tsize;
599
600 #ifndef nolint
601 tsize = (u_quad_t)0;
602 #endif
603
604 /*
605 * Setting of flags is not supported.
606 */
607 if (vap->va_flags != VNOVAL)
608 return (EOPNOTSUPP);
609
610 /*
611 * Disallow write attempts if the filesystem is mounted read-only.
612 */
613 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
614 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
615 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) &&
616 (vp->v_mount->mnt_flag & MNT_RDONLY))
617 return (EROFS);
618 if (vap->va_size != VNOVAL) {
619 switch (vp->v_type) {
620 case VDIR:
621 return (EISDIR);
622 case VCHR:
623 case VBLK:
624 case VSOCK:
625 case VFIFO:
626 if (vap->va_mtime.tv_sec == VNOVAL &&
627 vap->va_atime.tv_sec == VNOVAL &&
628 vap->va_mode == (mode_t)VNOVAL &&
629 vap->va_uid == (uid_t)VNOVAL &&
630 vap->va_gid == (gid_t)VNOVAL)
631 return (0);
632 vap->va_size = VNOVAL;
633 break;
634 default:
635 /*
636 * Disallow write attempts if the filesystem is
637 * mounted read-only.
638 */
639 if (vp->v_mount->mnt_flag & MNT_RDONLY)
640 return (EROFS);
641
642 /*
643 * We run vnode_pager_setsize() early (why?),
644 * we must set np->n_size now to avoid vinvalbuf
645 * V_SAVE races that might setsize a lower
646 * value.
647 */
648
649 tsize = np->n_size;
650 error = nfs_meta_setsize(vp, ap->a_cred,
651 ap->a_td, vap->va_size);
652
653 if (np->n_flag & NMODIFIED) {
654 if (vap->va_size == 0)
655 error = nfs_vinvalbuf(vp, 0,
656 ap->a_cred, ap->a_td, 1);
657 else
658 error = nfs_vinvalbuf(vp, V_SAVE,
659 ap->a_cred, ap->a_td, 1);
660 if (error) {
661 vnode_pager_setsize(vp, np->n_size);
662 return (error);
663 }
664 }
665 np->n_vattr.va_size = vap->va_size;
666 };
667 } else if ((vap->va_mtime.tv_sec != VNOVAL ||
668 vap->va_atime.tv_sec != VNOVAL) && (np->n_flag & NMODIFIED) &&
669 vp->v_type == VREG &&
670 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred,
671 ap->a_td, 1)) == EINTR)
672 return (error);
673 error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_td);
674 if (error && vap->va_size != VNOVAL) {
675 np->n_size = np->n_vattr.va_size = tsize;
676 vnode_pager_setsize(vp, np->n_size);
677 }
678 return (error);
679 }
680
681 /*
682 * Do an nfs setattr rpc.
683 */
684 static int
685 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
686 struct thread *td)
687 {
688 struct nfsv2_sattr *sp;
689 caddr_t bpos, dpos;
690 u_int32_t *tl;
691 int error = 0, wccflag = NFSV3_WCCRATTR;
692 struct mbuf *mreq, *mrep, *md, *mb;
693 int v3 = NFS_ISV3(vp);
694
695 nfsstats.rpccnt[NFSPROC_SETATTR]++;
696 mreq = nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3));
697 mb = mreq;
698 bpos = mtod(mb, caddr_t);
699 nfsm_fhtom(vp, v3);
700 if (v3) {
701 nfsm_v3attrbuild(vap, TRUE);
702 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
703 *tl = nfs_false;
704 } else {
705 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
706 if (vap->va_mode == (mode_t)VNOVAL)
707 sp->sa_mode = nfs_xdrneg1;
708 else
709 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode);
710 if (vap->va_uid == (uid_t)VNOVAL)
711 sp->sa_uid = nfs_xdrneg1;
712 else
713 sp->sa_uid = txdr_unsigned(vap->va_uid);
714 if (vap->va_gid == (gid_t)VNOVAL)
715 sp->sa_gid = nfs_xdrneg1;
716 else
717 sp->sa_gid = txdr_unsigned(vap->va_gid);
718 sp->sa_size = txdr_unsigned(vap->va_size);
719 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
720 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
721 }
722 nfsm_request(vp, NFSPROC_SETATTR, td, cred);
723 if (v3) {
724 nfsm_wcc_data(vp, wccflag);
725 } else
726 nfsm_loadattr(vp, NULL);
727 m_freem(mrep);
728 nfsmout:
729 return (error);
730 }
731
732 /*
733 * nfs lookup call, one step at a time...
734 * First look in cache
735 * If not found, unlock the directory nfsnode and do the rpc
736 */
737 static int
738 nfs_lookup(struct vop_lookup_args *ap)
739 {
740 struct componentname *cnp = ap->a_cnp;
741 struct vnode *dvp = ap->a_dvp;
742 struct vnode **vpp = ap->a_vpp;
743 int flags = cnp->cn_flags;
744 struct vnode *newvp;
745 struct nfsmount *nmp;
746 caddr_t bpos, dpos;
747 struct mbuf *mreq, *mrep, *md, *mb;
748 long len;
749 nfsfh_t *fhp;
750 struct nfsnode *np;
751 int lockparent, wantparent, error = 0, attrflag, fhsize;
752 int v3 = NFS_ISV3(dvp);
753 struct thread *td = cnp->cn_thread;
754
755 *vpp = NULLVP;
756 cnp->cn_flags &= ~PDIRUNLOCK;
757 if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) &&
758 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
759 return (EROFS);
760 if (dvp->v_type != VDIR)
761 return (ENOTDIR);
762 lockparent = flags & LOCKPARENT;
763 wantparent = flags & (LOCKPARENT|WANTPARENT);
764 nmp = VFSTONFS(dvp->v_mount);
765 np = VTONFS(dvp);
766 if ((error = cache_lookup(dvp, vpp, cnp)) && error != ENOENT) {
767 struct vattr vattr;
768 int vpid;
769
770 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) {
771 *vpp = NULLVP;
772 return (error);
773 }
774
775 vhold(*vpp);
776 newvp = *vpp;
777 vpid = newvp->v_id;
778 /*
779 * See the comment starting `Step through' in ufs/ufs_lookup.c
780 * for an explanation of the locking protocol
781 */
782 if (dvp == newvp) {
783 VREF(newvp);
784 error = 0;
785 } else if (flags & ISDOTDOT) {
786 VOP_UNLOCK(dvp, 0, td);
787 cnp->cn_flags |= PDIRUNLOCK;
788 error = vget(newvp, LK_EXCLUSIVE, td);
789 if (!error && lockparent && (flags & ISLASTCN)) {
790 error = vn_lock(dvp, LK_EXCLUSIVE, td);
791 if (error == 0)
792 cnp->cn_flags &= ~PDIRUNLOCK;
793 }
794 } else {
795 error = vget(newvp, LK_EXCLUSIVE, td);
796 if (!lockparent || error || !(flags & ISLASTCN)) {
797 VOP_UNLOCK(dvp, 0, td);
798 cnp->cn_flags |= PDIRUNLOCK;
799 }
800 }
801 if (!error) {
802 if (vpid == newvp->v_id) {
803 if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, td)
804 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) {
805 nfsstats.lookupcache_hits++;
806 if (cnp->cn_nameiop != LOOKUP &&
807 (flags & ISLASTCN))
808 cnp->cn_flags |= SAVENAME;
809 vdrop(newvp);
810 return (0);
811 }
812 cache_purge(newvp);
813 }
814 vput(newvp);
815 if (lockparent && dvp != newvp && (flags & ISLASTCN))
816 VOP_UNLOCK(dvp, 0, td);
817 }
818 vdrop(newvp);
819 error = vn_lock(dvp, LK_EXCLUSIVE, td);
820 *vpp = NULLVP;
821 if (error) {
822 cnp->cn_flags |= PDIRUNLOCK;
823 return (error);
824 }
825 cnp->cn_flags &= ~PDIRUNLOCK;
826 }
827 error = 0;
828 newvp = NULLVP;
829 nfsstats.lookupcache_misses++;
830 nfsstats.rpccnt[NFSPROC_LOOKUP]++;
831 len = cnp->cn_namelen;
832 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP,
833 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
834 mb = mreq;
835 bpos = mtod(mb, caddr_t);
836 nfsm_fhtom(dvp, v3);
837 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
838 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_thread, cnp->cn_cred);
839 if (error) {
840 nfsm_postop_attr(dvp, attrflag);
841 m_freem(mrep);
842 goto nfsmout;
843 }
844 nfsm_getfh(fhp, fhsize, v3);
845
846 /*
847 * Handle RENAME case...
848 */
849 if (cnp->cn_nameiop == RENAME && wantparent && (flags & ISLASTCN)) {
850 if (NFS_CMPFH(np, fhp, fhsize)) {
851 m_freem(mrep);
852 return (EISDIR);
853 }
854 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
855 if (error) {
856 m_freem(mrep);
857 return (error);
858 }
859 newvp = NFSTOV(np);
860 if (v3) {
861 nfsm_postop_attr(newvp, attrflag);
862 nfsm_postop_attr(dvp, attrflag);
863 } else
864 nfsm_loadattr(newvp, NULL);
865 *vpp = newvp;
866 m_freem(mrep);
867 cnp->cn_flags |= SAVENAME;
868 if (!lockparent) {
869 VOP_UNLOCK(dvp, 0, td);
870 cnp->cn_flags |= PDIRUNLOCK;
871 }
872 return (0);
873 }
874
875 if (flags & ISDOTDOT) {
876 VOP_UNLOCK(dvp, 0, td);
877 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
878 if (error) {
879 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
880 return (error);
881 }
882 newvp = NFSTOV(np);
883 if (lockparent && (flags & ISLASTCN)) {
884 error = vn_lock(dvp, LK_EXCLUSIVE, td);
885 if (error) {
886 cnp->cn_flags |= PDIRUNLOCK;
887 vput(newvp);
888 return (error);
889 }
890 } else
891 cnp->cn_flags |= PDIRUNLOCK;
892 } else if (NFS_CMPFH(np, fhp, fhsize)) {
893 VREF(dvp);
894 newvp = dvp;
895 } else {
896 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
897 if (error) {
898 m_freem(mrep);
899 return (error);
900 }
901 if (!lockparent || !(flags & ISLASTCN)) {
902 cnp->cn_flags |= PDIRUNLOCK;
903 VOP_UNLOCK(dvp, 0, td);
904 }
905 newvp = NFSTOV(np);
906 }
907 if (v3) {
908 nfsm_postop_attr(newvp, attrflag);
909 nfsm_postop_attr(dvp, attrflag);
910 } else
911 nfsm_loadattr(newvp, NULL);
912 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
913 cnp->cn_flags |= SAVENAME;
914 if ((cnp->cn_flags & MAKEENTRY) &&
915 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) {
916 np->n_ctime = np->n_vattr.va_ctime.tv_sec;
917 cache_enter(dvp, newvp, cnp);
918 }
919 *vpp = newvp;
920 m_freem(mrep);
921 nfsmout:
922 if (error) {
923 if (newvp != NULLVP) {
924 vrele(newvp);
925 *vpp = NULLVP;
926 }
927 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
928 (flags & ISLASTCN) && error == ENOENT) {
929 if (!lockparent) {
930 VOP_UNLOCK(dvp, 0, td);
931 cnp->cn_flags |= PDIRUNLOCK;
932 }
933 if (dvp->v_mount->mnt_flag & MNT_RDONLY)
934 error = EROFS;
935 else
936 error = EJUSTRETURN;
937 }
938 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
939 cnp->cn_flags |= SAVENAME;
940 }
941 return (error);
942 }
943
944 /*
945 * nfs read call.
946 * Just call nfs_bioread() to do the work.
947 */
948 static int
949 nfs_read(struct vop_read_args *ap)
950 {
951 struct vnode *vp = ap->a_vp;
952
953 if (vp->v_type != VREG)
954 return (EPERM);
955 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
956 }
957
958 /*
959 * nfs readlink call
960 */
961 static int
962 nfs_readlink(struct vop_readlink_args *ap)
963 {
964 struct vnode *vp = ap->a_vp;
965
966 if (vp->v_type != VLNK)
967 return (EINVAL);
968 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred));
969 }
970
971 /*
972 * Do a readlink rpc.
973 * Called by nfs_doio() from below the buffer cache.
974 */
975 int
976 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
977 {
978 caddr_t bpos, dpos;
979 int error = 0, len, attrflag;
980 struct mbuf *mreq, *mrep, *md, *mb;
981 int v3 = NFS_ISV3(vp);
982
983 nfsstats.rpccnt[NFSPROC_READLINK]++;
984 mreq = nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3));
985 mb = mreq;
986 bpos = mtod(mb, caddr_t);
987 nfsm_fhtom(vp, v3);
988 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred);
989 if (v3)
990 nfsm_postop_attr(vp, attrflag);
991 if (!error) {
992 nfsm_strsiz(len, NFS_MAXPATHLEN);
993 if (len == NFS_MAXPATHLEN) {
994 struct nfsnode *np = VTONFS(vp);
995 if (np->n_size && np->n_size < NFS_MAXPATHLEN)
996 len = np->n_size;
997 }
998 nfsm_mtouio(uiop, len);
999 }
1000 m_freem(mrep);
1001 nfsmout:
1002 return (error);
1003 }
1004
1005 /*
1006 * nfs read rpc call
1007 * Ditto above
1008 */
1009 int
1010 nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1011 {
1012 u_int32_t *tl;
1013 caddr_t bpos, dpos;
1014 struct mbuf *mreq, *mrep, *md, *mb;
1015 struct nfsmount *nmp;
1016 int error = 0, len, retlen, tsiz, eof, attrflag;
1017 int v3 = NFS_ISV3(vp);
1018
1019 #ifndef nolint
1020 eof = 0;
1021 #endif
1022 nmp = VFSTONFS(vp->v_mount);
1023 tsiz = uiop->uio_resid;
1024 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
1025 return (EFBIG);
1026 while (tsiz > 0) {
1027 nfsstats.rpccnt[NFSPROC_READ]++;
1028 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz;
1029 mreq = nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3);
1030 mb = mreq;
1031 bpos = mtod(mb, caddr_t);
1032 nfsm_fhtom(vp, v3);
1033 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED * 3);
1034 if (v3) {
1035 txdr_hyper(uiop->uio_offset, tl);
1036 *(tl + 2) = txdr_unsigned(len);
1037 } else {
1038 *tl++ = txdr_unsigned(uiop->uio_offset);
1039 *tl++ = txdr_unsigned(len);
1040 *tl = 0;
1041 }
1042 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, cred);
1043 if (v3) {
1044 nfsm_postop_attr(vp, attrflag);
1045 if (error) {
1046 m_freem(mrep);
1047 goto nfsmout;
1048 }
1049 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED);
1050 eof = fxdr_unsigned(int, *(tl + 1));
1051 } else
1052 nfsm_loadattr(vp, NULL);
1053 nfsm_strsiz(retlen, nmp->nm_rsize);
1054 nfsm_mtouio(uiop, retlen);
1055 m_freem(mrep);
1056 tsiz -= retlen;
1057 if (v3) {
1058 if (eof || retlen == 0) {
1059 tsiz = 0;
1060 }
1061 } else if (retlen < len) {
1062 tsiz = 0;
1063 }
1064 }
1065 nfsmout:
1066 return (error);
1067 }
1068
1069 /*
1070 * nfs write call
1071 */
1072 int
1073 nfs_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
1074 int *iomode, int *must_commit)
1075 {
1076 u_int32_t *tl;
1077 int32_t backup;
1078 caddr_t bpos, dpos;
1079 struct mbuf *mreq, *mrep, *md, *mb;
1080 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
1081 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit;
1082 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC;
1083
1084 #ifndef DIAGNOSTIC
1085 if (uiop->uio_iovcnt != 1)
1086 panic("nfs: writerpc iovcnt > 1");
1087 #endif
1088 *must_commit = 0;
1089 tsiz = uiop->uio_resid;
1090 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
1091 return (EFBIG);
1092 while (tsiz > 0) {
1093 nfsstats.rpccnt[NFSPROC_WRITE]++;
1094 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz;
1095 mreq = nfsm_reqhead(vp, NFSPROC_WRITE,
1096 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len));
1097 mb = mreq;
1098 bpos = mtod(mb, caddr_t);
1099 nfsm_fhtom(vp, v3);
1100 if (v3) {
1101 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED);
1102 txdr_hyper(uiop->uio_offset, tl);
1103 tl += 2;
1104 *tl++ = txdr_unsigned(len);
1105 *tl++ = txdr_unsigned(*iomode);
1106 *tl = txdr_unsigned(len);
1107 } else {
1108 u_int32_t x;
1109
1110 tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED);
1111 /* Set both "begin" and "current" to non-garbage. */
1112 x = txdr_unsigned((u_int32_t)uiop->uio_offset);
1113 *tl++ = x; /* "begin offset" */
1114 *tl++ = x; /* "current offset" */
1115 x = txdr_unsigned(len);
1116 *tl++ = x; /* total to this offset */
1117 *tl = x; /* size of this write */
1118 }
1119 nfsm_uiotom(uiop, len);
1120 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, cred);
1121 if (v3) {
1122 wccflag = NFSV3_WCCCHK;
1123 nfsm_wcc_data(vp, wccflag);
1124 if (!error) {
1125 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED
1126 + NFSX_V3WRITEVERF);
1127 rlen = fxdr_unsigned(int, *tl++);
1128 if (rlen == 0) {
1129 error = NFSERR_IO;
1130 m_freem(mrep);
1131 break;
1132 } else if (rlen < len) {
1133 backup = len - rlen;
1134 uiop->uio_iov->iov_base =
1135 (char *)uiop->uio_iov->iov_base -
1136 backup;
1137 uiop->uio_iov->iov_len += backup;
1138 uiop->uio_offset -= backup;
1139 uiop->uio_resid += backup;
1140 len = rlen;
1141 }
1142 commit = fxdr_unsigned(int, *tl++);
1143
1144 /*
1145 * Return the lowest committment level
1146 * obtained by any of the RPCs.
1147 */
1148 if (committed == NFSV3WRITE_FILESYNC)
1149 committed = commit;
1150 else if (committed == NFSV3WRITE_DATASYNC &&
1151 commit == NFSV3WRITE_UNSTABLE)
1152 committed = commit;
1153 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){
1154 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
1155 NFSX_V3WRITEVERF);
1156 nmp->nm_state |= NFSSTA_HASWRITEVERF;
1157 } else if (bcmp((caddr_t)tl,
1158 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) {
1159 *must_commit = 1;
1160 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
1161 NFSX_V3WRITEVERF);
1162 }
1163 }
1164 } else
1165 nfsm_loadattr(vp, NULL);
1166 if (wccflag)
1167 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime.tv_sec;
1168 m_freem(mrep);
1169 if (error)
1170 break;
1171 tsiz -= len;
1172 }
1173 nfsmout:
1174 if (vp->v_mount->mnt_flag & MNT_ASYNC)
1175 committed = NFSV3WRITE_FILESYNC;
1176 *iomode = committed;
1177 if (error)
1178 uiop->uio_resid = tsiz;
1179 return (error);
1180 }
1181
1182 /*
1183 * nfs mknod rpc
1184 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
1185 * mode set to specify the file type and the size field for rdev.
1186 */
1187 static int
1188 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
1189 struct vattr *vap)
1190 {
1191 struct nfsv2_sattr *sp;
1192 u_int32_t *tl;
1193 struct vnode *newvp = NULL;
1194 struct nfsnode *np = NULL;
1195 struct vattr vattr;
1196 caddr_t bpos, dpos;
1197 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0;
1198 struct mbuf *mreq, *mrep, *md, *mb;
1199 u_int32_t rdev;
1200 int v3 = NFS_ISV3(dvp);
1201
1202 if (vap->va_type == VCHR || vap->va_type == VBLK)
1203 rdev = txdr_unsigned(vap->va_rdev);
1204 else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
1205 rdev = nfs_xdrneg1;
1206 else {
1207 return (EOPNOTSUPP);
1208 }
1209 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) {
1210 return (error);
1211 }
1212 nfsstats.rpccnt[NFSPROC_MKNOD]++;
1213 mreq = nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED +
1214 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
1215 mb = mreq;
1216 bpos = mtod(mb, caddr_t);
1217 nfsm_fhtom(dvp, v3);
1218 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
1219 if (v3) {
1220 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
1221 *tl++ = vtonfsv3_type(vap->va_type);
1222 nfsm_v3attrbuild(vap, FALSE);
1223 if (vap->va_type == VCHR || vap->va_type == VBLK) {
1224 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
1225 *tl++ = txdr_unsigned(umajor(vap->va_rdev));
1226 *tl = txdr_unsigned(uminor(vap->va_rdev));
1227 }
1228 } else {
1229 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
1230 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
1231 sp->sa_uid = nfs_xdrneg1;
1232 sp->sa_gid = nfs_xdrneg1;
1233 sp->sa_size = rdev;
1234 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
1235 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
1236 }
1237 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_thread, cnp->cn_cred);
1238 if (!error) {
1239 nfsm_mtofh(dvp, newvp, v3, gotvp);
1240 if (!gotvp) {
1241 if (newvp) {
1242 vput(newvp);
1243 newvp = NULL;
1244 }
1245 error = nfs_lookitup(dvp, cnp->cn_nameptr,
1246 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np);
1247 if (!error)
1248 newvp = NFSTOV(np);
1249 }
1250 }
1251 if (v3)
1252 nfsm_wcc_data(dvp, wccflag);
1253 m_freem(mrep);
1254 nfsmout:
1255 if (error) {
1256 if (newvp)
1257 vput(newvp);
1258 } else {
1259 if (cnp->cn_flags & MAKEENTRY)
1260 cache_enter(dvp, newvp, cnp);
1261 *vpp = newvp;
1262 }
1263 VTONFS(dvp)->n_flag |= NMODIFIED;
1264 if (!wccflag)
1265 VTONFS(dvp)->n_attrstamp = 0;
1266 return (error);
1267 }
1268
1269 /*
1270 * nfs mknod vop
1271 * just call nfs_mknodrpc() to do the work.
1272 */
1273 /* ARGSUSED */
1274 static int
1275 nfs_mknod(struct vop_mknod_args *ap)
1276 {
1277
1278 return nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap);
1279 }
1280
1281 static u_long create_verf;
1282 /*
1283 * nfs file create call
1284 */
1285 static int
1286 nfs_create(struct vop_create_args *ap)
1287 {
1288 struct vnode *dvp = ap->a_dvp;
1289 struct vattr *vap = ap->a_vap;
1290 struct componentname *cnp = ap->a_cnp;
1291 struct nfsv2_sattr *sp;
1292 u_int32_t *tl;
1293 struct nfsnode *np = NULL;
1294 struct vnode *newvp = NULL;
1295 caddr_t bpos, dpos;
1296 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0;
1297 struct mbuf *mreq, *mrep, *md, *mb;
1298 struct vattr vattr;
1299 int v3 = NFS_ISV3(dvp);
1300
1301 /*
1302 * Oops, not for me..
1303 */
1304 if (vap->va_type == VSOCK)
1305 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
1306
1307 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) {
1308 return (error);
1309 }
1310 if (vap->va_vaflags & VA_EXCLUSIVE)
1311 fmode |= O_EXCL;
1312 again:
1313 nfsstats.rpccnt[NFSPROC_CREATE]++;
1314 mreq = nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED +
1315 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
1316 mb = mreq;
1317 bpos = mtod(mb, caddr_t);
1318 nfsm_fhtom(dvp, v3);
1319 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
1320 if (v3) {
1321 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
1322 if (fmode & O_EXCL) {
1323 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE);
1324 tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF);
1325 #ifdef INET
1326 if (!TAILQ_EMPTY(&in_ifaddrhead))
1327 *tl++ = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr.s_addr;
1328 else
1329 #endif
1330 *tl++ = create_verf;
1331 *tl = ++create_verf;
1332 } else {
1333 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED);
1334 nfsm_v3attrbuild(vap, FALSE);
1335 }
1336 } else {
1337 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
1338 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
1339 sp->sa_uid = nfs_xdrneg1;
1340 sp->sa_gid = nfs_xdrneg1;
1341 sp->sa_size = 0;
1342 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
1343 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
1344 }
1345 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_thread, cnp->cn_cred);
1346 if (!error) {
1347 nfsm_mtofh(dvp, newvp, v3, gotvp);
1348 if (!gotvp) {
1349 if (newvp) {
1350 vput(newvp);
1351 newvp = NULL;
1352 }
1353 error = nfs_lookitup(dvp, cnp->cn_nameptr,
1354 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np);
1355 if (!error)
1356 newvp = NFSTOV(np);
1357 }
1358 }
1359 if (v3)
1360 nfsm_wcc_data(dvp, wccflag);
1361 m_freem(mrep);
1362 nfsmout:
1363 if (error) {
1364 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) {
1365 fmode &= ~O_EXCL;
1366 goto again;
1367 }
1368 if (newvp)
1369 vput(newvp);
1370 } else if (v3 && (fmode & O_EXCL)) {
1371 /*
1372 * We are normally called with only a partially initialized
1373 * VAP. Since the NFSv3 spec says that server may use the
1374 * file attributes to store the verifier, the spec requires
1375 * us to do a SETATTR RPC. FreeBSD servers store the verifier
1376 * in atime, but we can't really assume that all servers will
1377 * so we ensure that our SETATTR sets both atime and mtime.
1378 */
1379 if (vap->va_mtime.tv_sec == VNOVAL)
1380 vfs_timestamp(&vap->va_mtime);
1381 if (vap->va_atime.tv_sec == VNOVAL)
1382 vap->va_atime = vap->va_mtime;
1383 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_thread);
1384 }
1385 if (!error) {
1386 if (cnp->cn_flags & MAKEENTRY)
1387 cache_enter(dvp, newvp, cnp);
1388 *ap->a_vpp = newvp;
1389 }
1390 VTONFS(dvp)->n_flag |= NMODIFIED;
1391 if (!wccflag)
1392 VTONFS(dvp)->n_attrstamp = 0;
1393 return (error);
1394 }
1395
1396 /*
1397 * nfs file remove call
1398 * To try and make nfs semantics closer to ufs semantics, a file that has
1399 * other processes using the vnode is renamed instead of removed and then
1400 * removed later on the last close.
1401 * - If v_usecount > 1
1402 * If a rename is not already in the works
1403 * call nfs_sillyrename() to set it up
1404 * else
1405 * do the remove rpc
1406 */
1407 static int
1408 nfs_remove(struct vop_remove_args *ap)
1409 {
1410 struct vnode *vp = ap->a_vp;
1411 struct vnode *dvp = ap->a_dvp;
1412 struct componentname *cnp = ap->a_cnp;
1413 struct nfsnode *np = VTONFS(vp);
1414 int error = 0;
1415 struct vattr vattr;
1416
1417 #ifndef DIAGNOSTIC
1418 if ((cnp->cn_flags & HASBUF) == 0)
1419 panic("nfs_remove: no name");
1420 if (vrefcnt(vp) < 1)
1421 panic("nfs_remove: bad v_usecount");
1422 #endif
1423 if (vp->v_type == VDIR)
1424 error = EPERM;
1425 else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
1426 VOP_GETATTR(vp, &vattr, cnp->cn_cred, cnp->cn_thread) == 0 &&
1427 vattr.va_nlink > 1)) {
1428 /*
1429 * Purge the name cache so that the chance of a lookup for
1430 * the name succeeding while the remove is in progress is
1431 * minimized. Without node locking it can still happen, such
1432 * that an I/O op returns ESTALE, but since you get this if
1433 * another host removes the file..
1434 */
1435 cache_purge(vp);
1436 /*
1437 * throw away biocache buffers, mainly to avoid
1438 * unnecessary delayed writes later.
1439 */
1440 error = nfs_vinvalbuf(vp, 0, cnp->cn_cred, cnp->cn_thread, 1);
1441 /* Do the rpc */
1442 if (error != EINTR)
1443 error = nfs_removerpc(dvp, cnp->cn_nameptr,
1444 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
1445 /*
1446 * Kludge City: If the first reply to the remove rpc is lost..
1447 * the reply to the retransmitted request will be ENOENT
1448 * since the file was in fact removed
1449 * Therefore, we cheat and return success.
1450 */
1451 if (error == ENOENT)
1452 error = 0;
1453 } else if (!np->n_sillyrename)
1454 error = nfs_sillyrename(dvp, vp, cnp);
1455 np->n_attrstamp = 0;
1456 return (error);
1457 }
1458
1459 /*
1460 * nfs file remove rpc called from nfs_inactive
1461 */
1462 int
1463 nfs_removeit(struct sillyrename *sp)
1464 {
1465
1466 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred,
1467 NULL));
1468 }
1469
1470 /*
1471 * Nfs remove rpc, called from nfs_remove() and nfs_removeit().
1472 */
1473 static int
1474 nfs_removerpc(struct vnode *dvp, const char *name, int namelen,
1475 struct ucred *cred, struct thread *td)
1476 {
1477 caddr_t bpos, dpos;
1478 int error = 0, wccflag = NFSV3_WCCRATTR;
1479 struct mbuf *mreq, *mrep, *md, *mb;
1480 int v3 = NFS_ISV3(dvp);
1481
1482 nfsstats.rpccnt[NFSPROC_REMOVE]++;
1483 mreq = nfsm_reqhead(dvp, NFSPROC_REMOVE,
1484 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen));
1485 mb = mreq;
1486 bpos = mtod(mb, caddr_t);
1487 nfsm_fhtom(dvp, v3);
1488 nfsm_strtom(name, namelen, NFS_MAXNAMLEN);
1489 nfsm_request(dvp, NFSPROC_REMOVE, td, cred);
1490 if (v3)
1491 nfsm_wcc_data(dvp, wccflag);
1492 m_freem(mrep);
1493 nfsmout:
1494 VTONFS(dvp)->n_flag |= NMODIFIED;
1495 if (!wccflag)
1496 VTONFS(dvp)->n_attrstamp = 0;
1497 return (error);
1498 }
1499
1500 /*
1501 * nfs file rename call
1502 */
1503 static int
1504 nfs_rename(struct vop_rename_args *ap)
1505 {
1506 struct vnode *fvp = ap->a_fvp;
1507 struct vnode *tvp = ap->a_tvp;
1508 struct vnode *fdvp = ap->a_fdvp;
1509 struct vnode *tdvp = ap->a_tdvp;
1510 struct componentname *tcnp = ap->a_tcnp;
1511 struct componentname *fcnp = ap->a_fcnp;
1512 int error;
1513
1514 #ifndef DIAGNOSTIC
1515 if ((tcnp->cn_flags & HASBUF) == 0 ||
1516 (fcnp->cn_flags & HASBUF) == 0)
1517 panic("nfs_rename: no name");
1518 #endif
1519 /* Check for cross-device rename */
1520 if ((fvp->v_mount != tdvp->v_mount) ||
1521 (tvp && (fvp->v_mount != tvp->v_mount))) {
1522 error = EXDEV;
1523 goto out;
1524 }
1525
1526 if (fvp == tvp) {
1527 printf("nfs_rename: fvp == tvp (can't happen)\n");
1528 error = 0;
1529 goto out;
1530 }
1531 if ((error = vn_lock(fvp, LK_EXCLUSIVE, fcnp->cn_thread)) != 0)
1532 goto out;
1533
1534 /*
1535 * We have to flush B_DELWRI data prior to renaming
1536 * the file. If we don't, the delayed-write buffers
1537 * can be flushed out later after the file has gone stale
1538 * under NFSV3. NFSV2 does not have this problem because
1539 * ( as far as I can tell ) it flushes dirty buffers more
1540 * often.
1541 */
1542 VOP_FSYNC(fvp, fcnp->cn_cred, MNT_WAIT, fcnp->cn_thread);
1543 VOP_UNLOCK(fvp, 0, fcnp->cn_thread);
1544 if (tvp)
1545 VOP_FSYNC(tvp, tcnp->cn_cred, MNT_WAIT, tcnp->cn_thread);
1546
1547 /*
1548 * If the tvp exists and is in use, sillyrename it before doing the
1549 * rename of the new file over it.
1550 * XXX Can't sillyrename a directory.
1551 */
1552 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
1553 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
1554 vput(tvp);
1555 tvp = NULL;
1556 }
1557
1558 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen,
1559 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
1560 tcnp->cn_thread);
1561
1562 if (fvp->v_type == VDIR) {
1563 if (tvp != NULL && tvp->v_type == VDIR)
1564 cache_purge(tdvp);
1565 cache_purge(fdvp);
1566 }
1567
1568 out:
1569 if (tdvp == tvp)
1570 vrele(tdvp);
1571 else
1572 vput(tdvp);
1573 if (tvp)
1574 vput(tvp);
1575 vrele(fdvp);
1576 vrele(fvp);
1577 /*
1578 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
1579 */
1580 if (error == ENOENT)
1581 error = 0;
1582 return (error);
1583 }
1584
1585 /*
1586 * nfs file rename rpc called from nfs_remove() above
1587 */
1588 static int
1589 nfs_renameit(struct vnode *sdvp, struct componentname *scnp,
1590 struct sillyrename *sp)
1591 {
1592
1593 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp,
1594 sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread));
1595 }
1596
1597 /*
1598 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
1599 */
1600 static int
1601 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen,
1602 struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred,
1603 struct thread *td)
1604 {
1605 caddr_t bpos, dpos;
1606 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR;
1607 struct mbuf *mreq, *mrep, *md, *mb;
1608 int v3 = NFS_ISV3(fdvp);
1609
1610 nfsstats.rpccnt[NFSPROC_RENAME]++;
1611 mreq = nfsm_reqhead(fdvp, NFSPROC_RENAME,
1612 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) +
1613 nfsm_rndup(tnamelen));
1614 mb = mreq;
1615 bpos = mtod(mb, caddr_t);
1616 nfsm_fhtom(fdvp, v3);
1617 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN);
1618 nfsm_fhtom(tdvp, v3);
1619 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN);
1620 nfsm_request(fdvp, NFSPROC_RENAME, td, cred);
1621 if (v3) {
1622 nfsm_wcc_data(fdvp, fwccflag);
1623 nfsm_wcc_data(tdvp, twccflag);
1624 }
1625 m_freem(mrep);
1626 nfsmout:
1627 VTONFS(fdvp)->n_flag |= NMODIFIED;
1628 VTONFS(tdvp)->n_flag |= NMODIFIED;
1629 if (!fwccflag)
1630 VTONFS(fdvp)->n_attrstamp = 0;
1631 if (!twccflag)
1632 VTONFS(tdvp)->n_attrstamp = 0;
1633 return (error);
1634 }
1635
1636 /*
1637 * nfs hard link create call
1638 */
1639 static int
1640 nfs_link(struct vop_link_args *ap)
1641 {
1642 struct vnode *vp = ap->a_vp;
1643 struct vnode *tdvp = ap->a_tdvp;
1644 struct componentname *cnp = ap->a_cnp;
1645 caddr_t bpos, dpos;
1646 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0;
1647 struct mbuf *mreq, *mrep, *md, *mb;
1648 int v3;
1649
1650 if (vp->v_mount != tdvp->v_mount) {
1651 return (EXDEV);
1652 }
1653
1654 /*
1655 * Push all writes to the server, so that the attribute cache
1656 * doesn't get "out of sync" with the server.
1657 * XXX There should be a better way!
1658 */
1659 VOP_FSYNC(vp, cnp->cn_cred, MNT_WAIT, cnp->cn_thread);
1660
1661 v3 = NFS_ISV3(vp);
1662 nfsstats.rpccnt[NFSPROC_LINK]++;
1663 mreq = nfsm_reqhead(vp, NFSPROC_LINK,
1664 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
1665 mb = mreq;
1666 bpos = mtod(mb, caddr_t);
1667 nfsm_fhtom(vp, v3);
1668 nfsm_fhtom(tdvp, v3);
1669 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
1670 nfsm_request(vp, NFSPROC_LINK, cnp->cn_thread, cnp->cn_cred);
1671 if (v3) {
1672 nfsm_postop_attr(vp, attrflag);
1673 nfsm_wcc_data(tdvp, wccflag);
1674 }
1675 m_freem(mrep);
1676 nfsmout:
1677 VTONFS(tdvp)->n_flag |= NMODIFIED;
1678 if (!attrflag)
1679 VTONFS(vp)->n_attrstamp = 0;
1680 if (!wccflag)
1681 VTONFS(tdvp)->n_attrstamp = 0;
1682 /*
1683 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry.
1684 */
1685 if (error == EEXIST)
1686 error = 0;
1687 return (error);
1688 }
1689
1690 /*
1691 * nfs symbolic link create call
1692 */
1693 static int
1694 nfs_symlink(struct vop_symlink_args *ap)
1695 {
1696 struct vnode *dvp = ap->a_dvp;
1697 struct vattr *vap = ap->a_vap;
1698 struct componentname *cnp = ap->a_cnp;
1699 struct nfsv2_sattr *sp;
1700 caddr_t bpos, dpos;
1701 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp;
1702 struct mbuf *mreq, *mrep, *md, *mb;
1703 struct vnode *newvp = NULL;
1704 int v3 = NFS_ISV3(dvp);
1705
1706 nfsstats.rpccnt[NFSPROC_SYMLINK]++;
1707 slen = strlen(ap->a_target);
1708 mreq = nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED +
1709 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3));
1710 mb = mreq;
1711 bpos = mtod(mb, caddr_t);
1712 nfsm_fhtom(dvp, v3);
1713 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
1714 if (v3) {
1715 nfsm_v3attrbuild(vap, FALSE);
1716 }
1717 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN);
1718 if (!v3) {
1719 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
1720 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode);
1721 sp->sa_uid = nfs_xdrneg1;
1722 sp->sa_gid = nfs_xdrneg1;
1723 sp->sa_size = nfs_xdrneg1;
1724 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
1725 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
1726 }
1727
1728 /*
1729 * Issue the NFS request and get the rpc response.
1730 *
1731 * Only NFSv3 responses returning an error of 0 actually return
1732 * a file handle that can be converted into newvp without having
1733 * to do an extra lookup rpc.
1734 */
1735 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_thread, cnp->cn_cred);
1736 if (v3) {
1737 if (error == 0)
1738 nfsm_mtofh(dvp, newvp, v3, gotvp);
1739 nfsm_wcc_data(dvp, wccflag);
1740 }
1741
1742 /*
1743 * out code jumps -> here, mrep is also freed.
1744 */
1745
1746 m_freem(mrep);
1747 nfsmout:
1748
1749 /*
1750 * If we get an EEXIST error, silently convert it to no-error
1751 * in case of an NFS retry.
1752 */
1753 if (error == EEXIST)
1754 error = 0;
1755
1756 /*
1757 * If we do not have (or no longer have) an error, and we could
1758 * not extract the newvp from the response due to the request being
1759 * NFSv2 or the error being EEXIST. We have to do a lookup in order
1760 * to obtain a newvp to return.
1761 */
1762 if (error == 0 && newvp == NULL) {
1763 struct nfsnode *np = NULL;
1764
1765 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1766 cnp->cn_cred, cnp->cn_thread, &np);
1767 if (!error)
1768 newvp = NFSTOV(np);
1769 }
1770 if (error) {
1771 if (newvp)
1772 vput(newvp);
1773 } else {
1774 *ap->a_vpp = newvp;
1775 }
1776 VTONFS(dvp)->n_flag |= NMODIFIED;
1777 if (!wccflag)
1778 VTONFS(dvp)->n_attrstamp = 0;
1779 return (error);
1780 }
1781
1782 /*
1783 * nfs make dir call
1784 */
1785 static int
1786 nfs_mkdir(struct vop_mkdir_args *ap)
1787 {
1788 struct vnode *dvp = ap->a_dvp;
1789 struct vattr *vap = ap->a_vap;
1790 struct componentname *cnp = ap->a_cnp;
1791 struct nfsv2_sattr *sp;
1792 int len;
1793 struct nfsnode *np = NULL;
1794 struct vnode *newvp = NULL;
1795 caddr_t bpos, dpos;
1796 int error = 0, wccflag = NFSV3_WCCRATTR;
1797 int gotvp = 0;
1798 struct mbuf *mreq, *mrep, *md, *mb;
1799 struct vattr vattr;
1800 int v3 = NFS_ISV3(dvp);
1801
1802 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) {
1803 return (error);
1804 }
1805 len = cnp->cn_namelen;
1806 nfsstats.rpccnt[NFSPROC_MKDIR]++;
1807 mreq = nfsm_reqhead(dvp, NFSPROC_MKDIR,
1808 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3));
1809 mb = mreq;
1810 bpos = mtod(mb, caddr_t);
1811 nfsm_fhtom(dvp, v3);
1812 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
1813 if (v3) {
1814 nfsm_v3attrbuild(vap, FALSE);
1815 } else {
1816 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR);
1817 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode);
1818 sp->sa_uid = nfs_xdrneg1;
1819 sp->sa_gid = nfs_xdrneg1;
1820 sp->sa_size = nfs_xdrneg1;
1821 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
1822 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
1823 }
1824 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_thread, cnp->cn_cred);
1825 if (!error)
1826 nfsm_mtofh(dvp, newvp, v3, gotvp);
1827 if (v3)
1828 nfsm_wcc_data(dvp, wccflag);
1829 m_freem(mrep);
1830 nfsmout:
1831 VTONFS(dvp)->n_flag |= NMODIFIED;
1832 if (!wccflag)
1833 VTONFS(dvp)->n_attrstamp = 0;
1834 /*
1835 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry
1836 * if we can succeed in looking up the directory.
1837 */
1838 if (error == EEXIST || (!error && !gotvp)) {
1839 if (newvp) {
1840 vrele(newvp);
1841 newvp = NULL;
1842 }
1843 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred,
1844 cnp->cn_thread, &np);
1845 if (!error) {
1846 newvp = NFSTOV(np);
1847 if (newvp->v_type != VDIR)
1848 error = EEXIST;
1849 }
1850 }
1851 if (error) {
1852 if (newvp)
1853 vrele(newvp);
1854 } else
1855 *ap->a_vpp = newvp;
1856 return (error);
1857 }
1858
1859 /*
1860 * nfs remove directory call
1861 */
1862 static int
1863 nfs_rmdir(struct vop_rmdir_args *ap)
1864 {
1865 struct vnode *vp = ap->a_vp;
1866 struct vnode *dvp = ap->a_dvp;
1867 struct componentname *cnp = ap->a_cnp;
1868 caddr_t bpos, dpos;
1869 int error = 0, wccflag = NFSV3_WCCRATTR;
1870 struct mbuf *mreq, *mrep, *md, *mb;
1871 int v3 = NFS_ISV3(dvp);
1872
1873 if (dvp == vp)
1874 return (EINVAL);
1875 nfsstats.rpccnt[NFSPROC_RMDIR]++;
1876 mreq = nfsm_reqhead(dvp, NFSPROC_RMDIR,
1877 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
1878 mb = mreq;
1879 bpos = mtod(mb, caddr_t);
1880 nfsm_fhtom(dvp, v3);
1881 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
1882 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred);
1883 if (v3)
1884 nfsm_wcc_data(dvp, wccflag);
1885 m_freem(mrep);
1886 nfsmout:
1887 VTONFS(dvp)->n_flag |= NMODIFIED;
1888 if (!wccflag)
1889 VTONFS(dvp)->n_attrstamp = 0;
1890 cache_purge(dvp);
1891 cache_purge(vp);
1892 /*
1893 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
1894 */
1895 if (error == ENOENT)
1896 error = 0;
1897 return (error);
1898 }
1899
1900 /*
1901 * nfs readdir call
1902 */
1903 static int
1904 nfs_readdir(struct vop_readdir_args *ap)
1905 {
1906 struct vnode *vp = ap->a_vp;
1907 struct nfsnode *np = VTONFS(vp);
1908 struct uio *uio = ap->a_uio;
1909 int tresid, error;
1910 struct vattr vattr;
1911
1912 if (vp->v_type != VDIR)
1913 return (EPERM);
1914 /*
1915 * First, check for hit on the EOF offset cache
1916 */
1917 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
1918 (np->n_flag & NMODIFIED) == 0) {
1919 if (VOP_GETATTR(vp, &vattr, ap->a_cred, uio->uio_td) == 0 &&
1920 np->n_mtime == vattr.va_mtime.tv_sec) {
1921 nfsstats.direofcache_hits++;
1922 return (0);
1923 }
1924 }
1925
1926 /*
1927 * Call nfs_bioread() to do the real work.
1928 */
1929 tresid = uio->uio_resid;
1930 error = nfs_bioread(vp, uio, 0, ap->a_cred);
1931
1932 if (!error && uio->uio_resid == tresid)
1933 nfsstats.direofcache_misses++;
1934 return (error);
1935 }
1936
1937 /*
1938 * Readdir rpc call.
1939 * Called from below the buffer cache by nfs_doio().
1940 */
1941 int
1942 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1943 {
1944 int len, left;
1945 struct dirent *dp = NULL;
1946 u_int32_t *tl;
1947 caddr_t cp;
1948 nfsuint64 *cookiep;
1949 caddr_t bpos, dpos;
1950 struct mbuf *mreq, *mrep, *md, *mb;
1951 nfsuint64 cookie;
1952 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
1953 struct nfsnode *dnp = VTONFS(vp);
1954 u_quad_t fileno;
1955 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1;
1956 int attrflag;
1957 int v3 = NFS_ISV3(vp);
1958
1959 #ifndef DIAGNOSTIC
1960 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) ||
1961 (uiop->uio_resid & (DIRBLKSIZ - 1)))
1962 panic("nfs readdirrpc bad uio");
1963 #endif
1964
1965 /*
1966 * If there is no cookie, assume directory was stale.
1967 */
1968 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
1969 if (cookiep)
1970 cookie = *cookiep;
1971 else
1972 return (NFSERR_BAD_COOKIE);
1973 /*
1974 * Loop around doing readdir rpc's of size nm_readdirsize
1975 * truncated to a multiple of DIRBLKSIZ.
1976 * The stopping criteria is EOF or buffer full.
1977 */
1978 while (more_dirs && bigenough) {
1979 nfsstats.rpccnt[NFSPROC_READDIR]++;
1980 mreq = nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) +
1981 NFSX_READDIR(v3));
1982 mb = mreq;
1983 bpos = mtod(mb, caddr_t);
1984 nfsm_fhtom(vp, v3);
1985 if (v3) {
1986 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED);
1987 *tl++ = cookie.nfsuquad[0];
1988 *tl++ = cookie.nfsuquad[1];
1989 *tl++ = dnp->n_cookieverf.nfsuquad[0];
1990 *tl++ = dnp->n_cookieverf.nfsuquad[1];
1991 } else {
1992 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED);
1993 *tl++ = cookie.nfsuquad[0];
1994 }
1995 *tl = txdr_unsigned(nmp->nm_readdirsize);
1996 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred);
1997 if (v3) {
1998 nfsm_postop_attr(vp, attrflag);
1999 if (!error) {
2000 tl = nfsm_dissect(u_int32_t *,
2001 2 * NFSX_UNSIGNED);
2002 dnp->n_cookieverf.nfsuquad[0] = *tl++;
2003 dnp->n_cookieverf.nfsuquad[1] = *tl;
2004 } else {
2005 m_freem(mrep);
2006 goto nfsmout;
2007 }
2008 }
2009 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
2010 more_dirs = fxdr_unsigned(int, *tl);
2011
2012 /* loop thru the dir entries, doctoring them to 4bsd form */
2013 while (more_dirs && bigenough) {
2014 if (v3) {
2015 tl = nfsm_dissect(u_int32_t *,
2016 3 * NFSX_UNSIGNED);
2017 fileno = fxdr_hyper(tl);
2018 len = fxdr_unsigned(int, *(tl + 2));
2019 } else {
2020 tl = nfsm_dissect(u_int32_t *,
2021 2 * NFSX_UNSIGNED);
2022 fileno = fxdr_unsigned(u_quad_t, *tl++);
2023 len = fxdr_unsigned(int, *tl);
2024 }
2025 if (len <= 0 || len > NFS_MAXNAMLEN) {
2026 error = EBADRPC;
2027 m_freem(mrep);
2028 goto nfsmout;
2029 }
2030 tlen = nfsm_rndup(len);
2031 if (tlen == len)
2032 tlen += 4; /* To ensure null termination */
2033 left = DIRBLKSIZ - blksiz;
2034 if ((tlen + DIRHDSIZ) > left) {
2035 dp->d_reclen += left;
2036 uiop->uio_iov->iov_base =
2037 (char *)uiop->uio_iov->iov_base + left;
2038 uiop->uio_iov->iov_len -= left;
2039 uiop->uio_offset += left;
2040 uiop->uio_resid -= left;
2041 blksiz = 0;
2042 }
2043 if ((tlen + DIRHDSIZ) > uiop->uio_resid)
2044 bigenough = 0;
2045 if (bigenough) {
2046 dp = (struct dirent *)uiop->uio_iov->iov_base;
2047 dp->d_fileno = (int)fileno;
2048 dp->d_namlen = len;
2049 dp->d_reclen = tlen + DIRHDSIZ;
2050 dp->d_type = DT_UNKNOWN;
2051 blksiz += dp->d_reclen;
2052 if (blksiz == DIRBLKSIZ)
2053 blksiz = 0;
2054 uiop->uio_offset += DIRHDSIZ;
2055 uiop->uio_resid -= DIRHDSIZ;
2056 uiop->uio_iov->iov_base =
2057 (char *)uiop->uio_iov->iov_base + DIRHDSIZ;
2058 uiop->uio_iov->iov_len -= DIRHDSIZ;
2059 nfsm_mtouio(uiop, len);
2060 cp = uiop->uio_iov->iov_base;
2061 tlen -= len;
2062 *cp = '\0'; /* null terminate */
2063 uiop->uio_iov->iov_base =
2064 (char *)uiop->uio_iov->iov_base + tlen;
2065 uiop->uio_iov->iov_len -= tlen;
2066 uiop->uio_offset += tlen;
2067 uiop->uio_resid -= tlen;
2068 } else
2069 nfsm_adv(nfsm_rndup(len));
2070 if (v3) {
2071 tl = nfsm_dissect(u_int32_t *,
2072 3 * NFSX_UNSIGNED);
2073 } else {
2074 tl = nfsm_dissect(u_int32_t *,
2075 2 * NFSX_UNSIGNED);
2076 }
2077 if (bigenough) {
2078 cookie.nfsuquad[0] = *tl++;
2079 if (v3)
2080 cookie.nfsuquad[1] = *tl++;
2081 } else if (v3)
2082 tl += 2;
2083 else
2084 tl++;
2085 more_dirs = fxdr_unsigned(int, *tl);
2086 }
2087 /*
2088 * If at end of rpc data, get the eof boolean
2089 */
2090 if (!more_dirs) {
2091 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
2092 more_dirs = (fxdr_unsigned(int, *tl) == 0);
2093 }
2094 m_freem(mrep);
2095 }
2096 /*
2097 * Fill last record, iff any, out to a multiple of DIRBLKSIZ
2098 * by increasing d_reclen for the last record.
2099 */
2100 if (blksiz > 0) {
2101 left = DIRBLKSIZ - blksiz;
2102 dp->d_reclen += left;
2103 uiop->uio_iov->iov_base =
2104 (char *)uiop->uio_iov->iov_base + left;
2105 uiop->uio_iov->iov_len -= left;
2106 uiop->uio_offset += left;
2107 uiop->uio_resid -= left;
2108 }
2109
2110 /*
2111 * We are now either at the end of the directory or have filled the
2112 * block.
2113 */
2114 if (bigenough)
2115 dnp->n_direofoffset = uiop->uio_offset;
2116 else {
2117 if (uiop->uio_resid > 0)
2118 printf("EEK! readdirrpc resid > 0\n");
2119 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
2120 *cookiep = cookie;
2121 }
2122 nfsmout:
2123 return (error);
2124 }
2125
2126 /*
2127 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc().
2128 */
2129 int
2130 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
2131 {
2132 int len, left;
2133 struct dirent *dp;
2134 u_int32_t *tl;
2135 caddr_t cp;
2136 struct vnode *newvp;
2137 nfsuint64 *cookiep;
2138 caddr_t bpos, dpos, dpossav1, dpossav2;
2139 struct mbuf *mreq, *mrep, *md, *mb, *mdsav1, *mdsav2;
2140 struct nameidata nami, *ndp = &nami;
2141 struct componentname *cnp = &ndp->ni_cnd;
2142 nfsuint64 cookie;
2143 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2144 struct nfsnode *dnp = VTONFS(vp), *np;
2145 nfsfh_t *fhp;
2146 u_quad_t fileno;
2147 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i;
2148 int attrflag, fhsize;
2149
2150 #ifndef nolint
2151 dp = NULL;
2152 #endif
2153 #ifndef DIAGNOSTIC
2154 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) ||
2155 (uiop->uio_resid & (DIRBLKSIZ - 1)))
2156 panic("nfs readdirplusrpc bad uio");
2157 #endif
2158 ndp->ni_dvp = vp;
2159 newvp = NULLVP;
2160
2161 /*
2162 * If there is no cookie, assume directory was stale.
2163 */
2164 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0);
2165 if (cookiep)
2166 cookie = *cookiep;
2167 else
2168 return (NFSERR_BAD_COOKIE);
2169 /*
2170 * Loop around doing readdir rpc's of size nm_readdirsize
2171 * truncated to a multiple of DIRBLKSIZ.
2172 * The stopping criteria is EOF or buffer full.
2173 */
2174 while (more_dirs && bigenough) {
2175 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++;
2176 mreq = nfsm_reqhead(vp, NFSPROC_READDIRPLUS,
2177 NFSX_FH(1) + 6 * NFSX_UNSIGNED);
2178 mb = mreq;
2179 bpos = mtod(mb, caddr_t);
2180 nfsm_fhtom(vp, 1);
2181 tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED);
2182 *tl++ = cookie.nfsuquad[0];
2183 *tl++ = cookie.nfsuquad[1];
2184 *tl++ = dnp->n_cookieverf.nfsuquad[0];
2185 *tl++ = dnp->n_cookieverf.nfsuquad[1];
2186 *tl++ = txdr_unsigned(nmp->nm_readdirsize);
2187 *tl = txdr_unsigned(nmp->nm_rsize);
2188 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred);
2189 nfsm_postop_attr(vp, attrflag);
2190 if (error) {
2191 m_freem(mrep);
2192 goto nfsmout;
2193 }
2194 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
2195 dnp->n_cookieverf.nfsuquad[0] = *tl++;
2196 dnp->n_cookieverf.nfsuquad[1] = *tl++;
2197 more_dirs = fxdr_unsigned(int, *tl);
2198
2199 /* loop thru the dir entries, doctoring them to 4bsd form */
2200 while (more_dirs && bigenough) {
2201 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
2202 fileno = fxdr_hyper(tl);
2203 len = fxdr_unsigned(int, *(tl + 2));
2204 if (len <= 0 || len > NFS_MAXNAMLEN) {
2205 error = EBADRPC;
2206 m_freem(mrep);
2207 goto nfsmout;
2208 }
2209 tlen = nfsm_rndup(len);
2210 if (tlen == len)
2211 tlen += 4; /* To ensure null termination*/
2212 left = DIRBLKSIZ - blksiz;
2213 if ((tlen + DIRHDSIZ) > left) {
2214 dp->d_reclen += left;
2215 uiop->uio_iov->iov_base =
2216 (char *)uiop->uio_iov->iov_base + left;
2217 uiop->uio_iov->iov_len -= left;
2218 uiop->uio_offset += left;
2219 uiop->uio_resid -= left;
2220 blksiz = 0;
2221 }
2222 if ((tlen + DIRHDSIZ) > uiop->uio_resid)
2223 bigenough = 0;
2224 if (bigenough) {
2225 dp = (struct dirent *)uiop->uio_iov->iov_base;
2226 dp->d_fileno = (int)fileno;
2227 dp->d_namlen = len;
2228 dp->d_reclen = tlen + DIRHDSIZ;
2229 dp->d_type = DT_UNKNOWN;
2230 blksiz += dp->d_reclen;
2231 if (blksiz == DIRBLKSIZ)
2232 blksiz = 0;
2233 uiop->uio_offset += DIRHDSIZ;
2234 uiop->uio_resid -= DIRHDSIZ;
2235 uiop->uio_iov->iov_base =
2236 (char *)uiop->uio_iov->iov_base + DIRHDSIZ;
2237 uiop->uio_iov->iov_len -= DIRHDSIZ;
2238 cnp->cn_nameptr = uiop->uio_iov->iov_base;
2239 cnp->cn_namelen = len;
2240 nfsm_mtouio(uiop, len);
2241 cp = uiop->uio_iov->iov_base;
2242 tlen -= len;
2243 *cp = '\0';
2244 uiop->uio_iov->iov_base =
2245 (char *)uiop->uio_iov->iov_base + tlen;
2246 uiop->uio_iov->iov_len -= tlen;
2247 uiop->uio_offset += tlen;
2248 uiop->uio_resid -= tlen;
2249 } else
2250 nfsm_adv(nfsm_rndup(len));
2251 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
2252 if (bigenough) {
2253 cookie.nfsuquad[0] = *tl++;
2254 cookie.nfsuquad[1] = *tl++;
2255 } else
2256 tl += 2;
2257
2258 /*
2259 * Since the attributes are before the file handle
2260 * (sigh), we must skip over the attributes and then
2261 * come back and get them.
2262 */
2263 attrflag = fxdr_unsigned(int, *tl);
2264 if (attrflag) {
2265 dpossav1 = dpos;
2266 mdsav1 = md;
2267 nfsm_adv(NFSX_V3FATTR);
2268 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
2269 doit = fxdr_unsigned(int, *tl);
2270 if (doit) {
2271 nfsm_getfh(fhp, fhsize, 1);
2272 if (NFS_CMPFH(dnp, fhp, fhsize)) {
2273 VREF(vp);
2274 newvp = vp;
2275 np = dnp;
2276 } else {
2277 error = nfs_nget(vp->v_mount, fhp,
2278 fhsize, &np);
2279 if (error)
2280 doit = 0;
2281 else
2282 newvp = NFSTOV(np);
2283 }
2284 }
2285 if (doit && bigenough) {
2286 dpossav2 = dpos;
2287 dpos = dpossav1;
2288 mdsav2 = md;
2289 md = mdsav1;
2290 nfsm_loadattr(newvp, NULL);
2291 dpos = dpossav2;
2292 md = mdsav2;
2293 dp->d_type =
2294 IFTODT(VTTOIF(np->n_vattr.va_type));
2295 ndp->ni_vp = newvp;
2296 cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp);
2297 }
2298 } else {
2299 /* Just skip over the file handle */
2300 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
2301 i = fxdr_unsigned(int, *tl);
2302 nfsm_adv(nfsm_rndup(i));
2303 }
2304 if (newvp != NULLVP) {
2305 if (newvp == vp)
2306 vrele(newvp);
2307 else
2308 vput(newvp);
2309 newvp = NULLVP;
2310 }
2311 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
2312 more_dirs = fxdr_unsigned(int, *tl);
2313 }
2314 /*
2315 * If at end of rpc data, get the eof boolean
2316 */
2317 if (!more_dirs) {
2318 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
2319 more_dirs = (fxdr_unsigned(int, *tl) == 0);
2320 }
2321 m_freem(mrep);
2322 }
2323 /*
2324 * Fill last record, iff any, out to a multiple of DIRBLKSIZ
2325 * by increasing d_reclen for the last record.
2326 */
2327 if (blksiz > 0) {
2328 left = DIRBLKSIZ - blksiz;
2329 dp->d_reclen += left;
2330 uiop->uio_iov->iov_base =
2331 (char *)uiop->uio_iov->iov_base + left;
2332 uiop->uio_iov->iov_len -= left;
2333 uiop->uio_offset += left;
2334 uiop->uio_resid -= left;
2335 }
2336
2337 /*
2338 * We are now either at the end of the directory or have filled the
2339 * block.
2340 */
2341 if (bigenough)
2342 dnp->n_direofoffset = uiop->uio_offset;
2343 else {
2344 if (uiop->uio_resid > 0)
2345 printf("EEK! readdirplusrpc resid > 0\n");
2346 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1);
2347 *cookiep = cookie;
2348 }
2349 nfsmout:
2350 if (newvp != NULLVP) {
2351 if (newvp == vp)
2352 vrele(newvp);
2353 else
2354 vput(newvp);
2355 newvp = NULLVP;
2356 }
2357 return (error);
2358 }
2359
2360 /*
2361 * Silly rename. To make the NFS filesystem that is stateless look a little
2362 * more like the "ufs" a remove of an active vnode is translated to a rename
2363 * to a funny looking filename that is removed by nfs_inactive on the
2364 * nfsnode. There is the potential for another process on a different client
2365 * to create the same funny name between the nfs_lookitup() fails and the
2366 * nfs_rename() completes, but...
2367 */
2368 static int
2369 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
2370 {
2371 struct sillyrename *sp;
2372 struct nfsnode *np;
2373 int error;
2374 short pid;
2375
2376 cache_purge(dvp);
2377 np = VTONFS(vp);
2378 #ifndef DIAGNOSTIC
2379 if (vp->v_type == VDIR)
2380 panic("nfs: sillyrename dir");
2381 #endif
2382 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename),
2383 M_NFSREQ, M_WAITOK);
2384 sp->s_cred = crhold(cnp->cn_cred);
2385 sp->s_dvp = dvp;
2386 VREF(dvp);
2387
2388 /* Fudge together a funny name */
2389 pid = cnp->cn_thread->td_proc->p_pid;
2390 sp->s_namlen = sprintf(sp->s_name, ".nfsA%04x4.4", pid);
2391
2392 /* Try lookitups until we get one that isn't there */
2393 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2394 cnp->cn_thread, NULL) == 0) {
2395 sp->s_name[4]++;
2396 if (sp->s_name[4] > 'z') {
2397 error = EINVAL;
2398 goto bad;
2399 }
2400 }
2401 error = nfs_renameit(dvp, cnp, sp);
2402 if (error)
2403 goto bad;
2404 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2405 cnp->cn_thread, &np);
2406 np->n_sillyrename = sp;
2407 return (0);
2408 bad:
2409 vrele(sp->s_dvp);
2410 crfree(sp->s_cred);
2411 free((caddr_t)sp, M_NFSREQ);
2412 return (error);
2413 }
2414
2415 /*
2416 * Look up a file name and optionally either update the file handle or
2417 * allocate an nfsnode, depending on the value of npp.
2418 * npp == NULL --> just do the lookup
2419 * *npp == NULL --> allocate a new nfsnode and make sure attributes are
2420 * handled too
2421 * *npp != NULL --> update the file handle in the vnode
2422 */
2423 static int
2424 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred,
2425 struct thread *td, struct nfsnode **npp)
2426 {
2427 struct vnode *newvp = NULL;
2428 struct nfsnode *np, *dnp = VTONFS(dvp);
2429 caddr_t bpos, dpos;
2430 int error = 0, fhlen, attrflag;
2431 struct mbuf *mreq, *mrep, *md, *mb;
2432 nfsfh_t *nfhp;
2433 int v3 = NFS_ISV3(dvp);
2434
2435 nfsstats.rpccnt[NFSPROC_LOOKUP]++;
2436 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP,
2437 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
2438 mb = mreq;
2439 bpos = mtod(mb, caddr_t);
2440 nfsm_fhtom(dvp, v3);
2441 nfsm_strtom(name, len, NFS_MAXNAMLEN);
2442 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred);
2443 if (npp && !error) {
2444 nfsm_getfh(nfhp, fhlen, v3);
2445 if (*npp) {
2446 np = *npp;
2447 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) {
2448 free((caddr_t)np->n_fhp, M_NFSBIGFH);
2449 np->n_fhp = &np->n_fh;
2450 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH)
2451 np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK);
2452 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen);
2453 np->n_fhsize = fhlen;
2454 newvp = NFSTOV(np);
2455 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) {
2456 VREF(dvp);
2457 newvp = dvp;
2458 } else {
2459 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np);
2460 if (error) {
2461 m_freem(mrep);
2462 return (error);
2463 }
2464 newvp = NFSTOV(np);
2465 }
2466 if (v3) {
2467 nfsm_postop_attr(newvp, attrflag);
2468 if (!attrflag && *npp == NULL) {
2469 m_freem(mrep);
2470 if (newvp == dvp)
2471 vrele(newvp);
2472 else
2473 vput(newvp);
2474 return (ENOENT);
2475 }
2476 } else
2477 nfsm_loadattr(newvp, NULL);
2478 }
2479 m_freem(mrep);
2480 nfsmout:
2481 if (npp && *npp == NULL) {
2482 if (error) {
2483 if (newvp) {
2484 if (newvp == dvp)
2485 vrele(newvp);
2486 else
2487 vput(newvp);
2488 }
2489 } else
2490 *npp = np;
2491 }
2492 return (error);
2493 }
2494
2495 /*
2496 * Nfs Version 3 commit rpc
2497 */
2498 int
2499 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
2500 struct thread *td)
2501 {
2502 u_int32_t *tl;
2503 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2504 caddr_t bpos, dpos;
2505 int error = 0, wccflag = NFSV3_WCCRATTR;
2506 struct mbuf *mreq, *mrep, *md, *mb;
2507
2508 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0)
2509 return (0);
2510 nfsstats.rpccnt[NFSPROC_COMMIT]++;
2511 mreq = nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1));
2512 mb = mreq;
2513 bpos = mtod(mb, caddr_t);
2514 nfsm_fhtom(vp, 1);
2515 tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED);
2516 txdr_hyper(offset, tl);
2517 tl += 2;
2518 *tl = txdr_unsigned(cnt);
2519 nfsm_request(vp, NFSPROC_COMMIT, td, cred);
2520 nfsm_wcc_data(vp, wccflag);
2521 if (!error) {
2522 tl = nfsm_dissect(u_int32_t *, NFSX_V3WRITEVERF);
2523 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl,
2524 NFSX_V3WRITEVERF)) {
2525 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf,
2526 NFSX_V3WRITEVERF);
2527 error = NFSERR_STALEWRITEVERF;
2528 }
2529 }
2530 m_freem(mrep);
2531 nfsmout:
2532 return (error);
2533 }
2534
2535 /*
2536 * Strategy routine.
2537 * For async requests when nfsiod(s) are running, queue the request by
2538 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the
2539 * request.
2540 */
2541 static int
2542 nfs_strategy(struct vop_strategy_args *ap)
2543 {
2544 struct buf *bp = ap->a_bp;
2545 struct ucred *cr;
2546 struct thread *td;
2547 int error = 0;
2548
2549 KASSERT(!(bp->b_flags & B_DONE), ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
2550 KASSERT(BUF_REFCNT(bp) > 0, ("nfs_strategy: buffer %p not locked", bp));
2551
2552 if (bp->b_flags & B_PHYS)
2553 panic("nfs physio");
2554
2555 if (bp->b_flags & B_ASYNC)
2556 td = NULL;
2557 else
2558 td = curthread; /* XXX */
2559
2560 if (bp->b_iocmd == BIO_READ)
2561 cr = bp->b_rcred;
2562 else
2563 cr = bp->b_wcred;
2564
2565 /*
2566 * If the op is asynchronous and an i/o daemon is waiting
2567 * queue the request, wake it up and wait for completion
2568 * otherwise just do it ourselves.
2569 */
2570 if ((bp->b_flags & B_ASYNC) == 0 ||
2571 nfs_asyncio(bp, NOCRED, td))
2572 error = nfs_doio(bp, cr, td);
2573 return (error);
2574 }
2575
2576 /*
2577 * fsync vnode op. Just call nfs_flush() with commit == 1.
2578 */
2579 /* ARGSUSED */
2580 static int
2581 nfs_fsync(struct vop_fsync_args *ap)
2582 {
2583
2584 return (nfs_flush(ap->a_vp, ap->a_cred, ap->a_waitfor, ap->a_td, 1));
2585 }
2586
2587 /*
2588 * Flush all the blocks associated with a vnode.
2589 * Walk through the buffer pool and push any dirty pages
2590 * associated with the vnode.
2591 */
2592 static int
2593 nfs_flush(struct vnode *vp, struct ucred *cred, int waitfor, struct thread *td,
2594 int commit)
2595 {
2596 struct nfsnode *np = VTONFS(vp);
2597 struct buf *bp;
2598 int i;
2599 struct buf *nbp;
2600 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2601 int s, error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
2602 int passone = 1;
2603 u_quad_t off, endoff, toff;
2604 struct ucred* wcred = NULL;
2605 struct buf **bvec = NULL;
2606 #ifndef NFS_COMMITBVECSIZ
2607 #define NFS_COMMITBVECSIZ 20
2608 #endif
2609 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
2610 int bvecsize = 0, bveccount;
2611
2612 if (nmp->nm_flag & NFSMNT_INT)
2613 slpflag = PCATCH;
2614 if (!commit)
2615 passone = 0;
2616 /*
2617 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
2618 * server, but nas not been committed to stable storage on the server
2619 * yet. On the first pass, the byte range is worked out and the commit
2620 * rpc is done. On the second pass, nfs_writebp() is called to do the
2621 * job.
2622 */
2623 again:
2624 off = (u_quad_t)-1;
2625 endoff = 0;
2626 bvecpos = 0;
2627 if (NFS_ISV3(vp) && commit) {
2628 s = splbio();
2629 if (bvec != NULL && bvec != bvec_on_stack)
2630 free(bvec, M_TEMP);
2631 /*
2632 * Count up how many buffers waiting for a commit.
2633 */
2634 bveccount = 0;
2635 VI_LOCK(vp);
2636 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
2637 nbp = TAILQ_NEXT(bp, b_vnbufs);
2638 if (BUF_REFCNT(bp) == 0 &&
2639 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
2640 == (B_DELWRI | B_NEEDCOMMIT))
2641 bveccount++;
2642 }
2643 /*
2644 * Allocate space to remember the list of bufs to commit. It is
2645 * important to use M_NOWAIT here to avoid a race with nfs_write.
2646 * If we can't get memory (for whatever reason), we will end up
2647 * committing the buffers one-by-one in the loop below.
2648 */
2649 if (bveccount > NFS_COMMITBVECSIZ) {
2650 /*
2651 * Release the vnode interlock to avoid a lock
2652 * order reversal.
2653 */
2654 VI_UNLOCK(vp);
2655 bvec = (struct buf **)
2656 malloc(bveccount * sizeof(struct buf *),
2657 M_TEMP, M_NOWAIT);
2658 VI_LOCK(vp);
2659 if (bvec == NULL) {
2660 bvec = bvec_on_stack;
2661 bvecsize = NFS_COMMITBVECSIZ;
2662 } else
2663 bvecsize = bveccount;
2664 } else {
2665 bvec = bvec_on_stack;
2666 bvecsize = NFS_COMMITBVECSIZ;
2667 }
2668 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
2669 if (bvecpos >= bvecsize)
2670 break;
2671 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2672 nbp = TAILQ_NEXT(bp, b_vnbufs);
2673 continue;
2674 }
2675 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
2676 (B_DELWRI | B_NEEDCOMMIT)) {
2677 BUF_UNLOCK(bp);
2678 nbp = TAILQ_NEXT(bp, b_vnbufs);
2679 continue;
2680 }
2681 VI_UNLOCK(vp);
2682 bremfree(bp);
2683 /*
2684 * Work out if all buffers are using the same cred
2685 * so we can deal with them all with one commit.
2686 *
2687 * NOTE: we are not clearing B_DONE here, so we have
2688 * to do it later on in this routine if we intend to
2689 * initiate I/O on the bp.
2690 *
2691 * Note: to avoid loopback deadlocks, we do not
2692 * assign b_runningbufspace.
2693 */
2694 if (wcred == NULL)
2695 wcred = bp->b_wcred;
2696 else if (wcred != bp->b_wcred)
2697 wcred = NOCRED;
2698 bp->b_flags |= B_WRITEINPROG;
2699 vfs_busy_pages(bp, 1);
2700
2701 VI_LOCK(vp);
2702 /*
2703 * bp is protected by being locked, but nbp is not
2704 * and vfs_busy_pages() may sleep. We have to
2705 * recalculate nbp.
2706 */
2707 nbp = TAILQ_NEXT(bp, b_vnbufs);
2708
2709 /*
2710 * A list of these buffers is kept so that the
2711 * second loop knows which buffers have actually
2712 * been committed. This is necessary, since there
2713 * may be a race between the commit rpc and new
2714 * uncommitted writes on the file.
2715 */
2716 bvec[bvecpos++] = bp;
2717 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
2718 bp->b_dirtyoff;
2719 if (toff < off)
2720 off = toff;
2721 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
2722 if (toff > endoff)
2723 endoff = toff;
2724 }
2725 splx(s);
2726 VI_UNLOCK(vp);
2727 }
2728 if (bvecpos > 0) {
2729 /*
2730 * Commit data on the server, as required.
2731 * If all bufs are using the same wcred, then use that with
2732 * one call for all of them, otherwise commit each one
2733 * separately.
2734 */
2735 if (wcred != NOCRED)
2736 retv = nfs_commit(vp, off, (int)(endoff - off),
2737 wcred, td);
2738 else {
2739 retv = 0;
2740 for (i = 0; i < bvecpos; i++) {
2741 off_t off, size;
2742 bp = bvec[i];
2743 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
2744 bp->b_dirtyoff;
2745 size = (u_quad_t)(bp->b_dirtyend
2746 - bp->b_dirtyoff);
2747 retv = nfs_commit(vp, off, (int)size,
2748 bp->b_wcred, td);
2749 if (retv) break;
2750 }
2751 }
2752
2753 if (retv == NFSERR_STALEWRITEVERF)
2754 nfs_clearcommit(vp->v_mount);
2755
2756 /*
2757 * Now, either mark the blocks I/O done or mark the
2758 * blocks dirty, depending on whether the commit
2759 * succeeded.
2760 */
2761 for (i = 0; i < bvecpos; i++) {
2762 bp = bvec[i];
2763 bp->b_flags &= ~(B_NEEDCOMMIT | B_WRITEINPROG | B_CLUSTEROK);
2764 if (retv) {
2765 /*
2766 * Error, leave B_DELWRI intact
2767 */
2768 vfs_unbusy_pages(bp);
2769 brelse(bp);
2770 } else {
2771 /*
2772 * Success, remove B_DELWRI ( bundirty() ).
2773 *
2774 * b_dirtyoff/b_dirtyend seem to be NFS
2775 * specific. We should probably move that
2776 * into bundirty(). XXX
2777 */
2778 s = splbio();
2779 VI_LOCK(vp);
2780 vp->v_numoutput++;
2781 VI_UNLOCK(vp);
2782 bp->b_flags |= B_ASYNC;
2783 bundirty(bp);
2784 bp->b_flags &= ~B_DONE;
2785 bp->b_ioflags &= ~BIO_ERROR;
2786 bp->b_dirtyoff = bp->b_dirtyend = 0;
2787 splx(s);
2788 bufdone(bp);
2789 }
2790 }
2791 }
2792
2793 /*
2794 * Start/do any write(s) that are required.
2795 */
2796 loop:
2797 s = splbio();
2798 VI_LOCK(vp);
2799 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
2800 nbp = TAILQ_NEXT(bp, b_vnbufs);
2801 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2802 if (waitfor != MNT_WAIT || passone)
2803 continue;
2804
2805 error = BUF_TIMELOCK(bp,
2806 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
2807 VI_MTX(vp), "nfsfsync", slpflag, slptimeo);
2808 splx(s);
2809 if (error == 0)
2810 panic("nfs_fsync: inconsistent lock");
2811 if (error == ENOLCK)
2812 goto loop;
2813 if (nfs_sigintr(nmp, NULL, td)) {
2814 error = EINTR;
2815 goto done;
2816 }
2817 if (slpflag == PCATCH) {
2818 slpflag = 0;
2819 slptimeo = 2 * hz;
2820 }
2821 goto loop;
2822 }
2823 if ((bp->b_flags & B_DELWRI) == 0)
2824 panic("nfs_fsync: not dirty");
2825 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
2826 BUF_UNLOCK(bp);
2827 continue;
2828 }
2829 VI_UNLOCK(vp);
2830 bremfree(bp);
2831 if (passone || !commit)
2832 bp->b_flags |= B_ASYNC;
2833 else
2834 bp->b_flags |= B_ASYNC | B_WRITEINPROG;
2835 splx(s);
2836 BUF_WRITE(bp);
2837 goto loop;
2838 }
2839 splx(s);
2840 if (passone) {
2841 passone = 0;
2842 VI_UNLOCK(vp);
2843 goto again;
2844 }
2845 if (waitfor == MNT_WAIT) {
2846 while (vp->v_numoutput) {
2847 vp->v_iflag |= VI_BWAIT;
2848 error = msleep((caddr_t)&vp->v_numoutput, VI_MTX(vp),
2849 slpflag | (PRIBIO + 1), "nfsfsync", slptimeo);
2850 if (error) {
2851 VI_UNLOCK(vp);
2852 if (nfs_sigintr(nmp, NULL, td)) {
2853 error = EINTR;
2854 goto done;
2855 }
2856 if (slpflag == PCATCH) {
2857 slpflag = 0;
2858 slptimeo = 2 * hz;
2859 }
2860 VI_LOCK(vp);
2861 }
2862 }
2863 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd) && commit) {
2864 VI_UNLOCK(vp);
2865 goto loop;
2866 }
2867 }
2868 VI_UNLOCK(vp);
2869 if (np->n_flag & NWRITEERR) {
2870 error = np->n_error;
2871 np->n_flag &= ~NWRITEERR;
2872 }
2873 done:
2874 if (bvec != NULL && bvec != bvec_on_stack)
2875 free(bvec, M_TEMP);
2876 return (error);
2877 }
2878
2879 /*
2880 * NFS advisory byte-level locks.
2881 */
2882 static int
2883 nfs_advlock(struct vop_advlock_args *ap)
2884 {
2885
2886 if ((VFSTONFS(ap->a_vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
2887 struct nfsnode *np = VTONFS(ap->a_vp);
2888
2889 return (lf_advlock(ap, &(np->n_lockf), np->n_size));
2890 }
2891 return (nfs_dolock(ap));
2892 }
2893
2894 /*
2895 * Print out the contents of an nfsnode.
2896 */
2897 static int
2898 nfs_print(struct vop_print_args *ap)
2899 {
2900 struct vnode *vp = ap->a_vp;
2901 struct nfsnode *np = VTONFS(vp);
2902
2903 printf("\tfileid %ld fsid 0x%x",
2904 np->n_vattr.va_fileid, np->n_vattr.va_fsid);
2905 if (vp->v_type == VFIFO)
2906 fifo_printinfo(vp);
2907 printf("\n");
2908 return (0);
2909 }
2910
2911 /*
2912 * This is the "real" nfs::bwrite(struct buf*).
2913 * B_WRITEINPROG isn't set unless the force flag is one and it
2914 * handles the B_NEEDCOMMIT flag.
2915 * We set B_CACHE if this is a VMIO buffer.
2916 */
2917 int
2918 nfs_writebp(struct buf *bp, int force, struct thread *td)
2919 {
2920 int s;
2921 int oldflags = bp->b_flags;
2922 #if 0
2923 int retv = 1;
2924 off_t off;
2925 #endif
2926
2927 if (BUF_REFCNT(bp) == 0)
2928 panic("bwrite: buffer is not locked???");
2929
2930 if (bp->b_flags & B_INVAL) {
2931 brelse(bp);
2932 return(0);
2933 }
2934
2935 bp->b_flags |= B_CACHE;
2936
2937 /*
2938 * Undirty the bp. We will redirty it later if the I/O fails.
2939 */
2940
2941 s = splbio();
2942 bundirty(bp);
2943 bp->b_flags &= ~B_DONE;
2944 bp->b_ioflags &= ~BIO_ERROR;
2945 bp->b_iocmd = BIO_WRITE;
2946
2947 VI_LOCK(bp->b_vp);
2948 bp->b_vp->v_numoutput++;
2949 VI_UNLOCK(bp->b_vp);
2950 curthread->td_proc->p_stats->p_ru.ru_oublock++;
2951 splx(s);
2952
2953 /*
2954 * Note: to avoid loopback deadlocks, we do not
2955 * assign b_runningbufspace.
2956 */
2957 vfs_busy_pages(bp, 1);
2958
2959 if (force)
2960 bp->b_flags |= B_WRITEINPROG;
2961 BUF_KERNPROC(bp);
2962 VOP_STRATEGY(bp->b_vp, bp);
2963
2964 if( (oldflags & B_ASYNC) == 0) {
2965 int rtval = bufwait(bp);
2966
2967 if (oldflags & B_DELWRI) {
2968 s = splbio();
2969 reassignbuf(bp, bp->b_vp);
2970 splx(s);
2971 }
2972
2973 brelse(bp);
2974 return (rtval);
2975 }
2976
2977 return (0);
2978 }
2979
2980 /*
2981 * nfs special file access vnode op.
2982 * Essentially just get vattr and then imitate iaccess() since the device is
2983 * local to the client.
2984 */
2985 static int
2986 nfsspec_access(struct vop_access_args *ap)
2987 {
2988 struct vattr *vap;
2989 struct ucred *cred = ap->a_cred;
2990 struct vnode *vp = ap->a_vp;
2991 mode_t mode = ap->a_mode;
2992 struct vattr vattr;
2993 int error;
2994
2995 /*
2996 * Disallow write attempts on filesystems mounted read-only;
2997 * unless the file is a socket, fifo, or a block or character
2998 * device resident on the filesystem.
2999 */
3000 if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
3001 switch (vp->v_type) {
3002 case VREG:
3003 case VDIR:
3004 case VLNK:
3005 return (EROFS);
3006 default:
3007 break;
3008 }
3009 }
3010 vap = &vattr;
3011 error = VOP_GETATTR(vp, vap, cred, ap->a_td);
3012 if (error)
3013 return (error);
3014 return (vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
3015 mode, cred, NULL));
3016 }
3017
3018 /*
3019 * Read wrapper for special devices.
3020 */
3021 static int
3022 nfsspec_read(struct vop_read_args *ap)
3023 {
3024 struct nfsnode *np = VTONFS(ap->a_vp);
3025
3026 /*
3027 * Set access flag.
3028 */
3029 np->n_flag |= NACC;
3030 getnanotime(&np->n_atim);
3031 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap));
3032 }
3033
3034 /*
3035 * Write wrapper for special devices.
3036 */
3037 static int
3038 nfsspec_write(struct vop_write_args *ap)
3039 {
3040 struct nfsnode *np = VTONFS(ap->a_vp);
3041
3042 /*
3043 * Set update flag.
3044 */
3045 np->n_flag |= NUPD;
3046 getnanotime(&np->n_mtim);
3047 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap));
3048 }
3049
3050 /*
3051 * Close wrapper for special devices.
3052 *
3053 * Update the times on the nfsnode then do device close.
3054 */
3055 static int
3056 nfsspec_close(struct vop_close_args *ap)
3057 {
3058 struct vnode *vp = ap->a_vp;
3059 struct nfsnode *np = VTONFS(vp);
3060 struct vattr vattr;
3061
3062 if (np->n_flag & (NACC | NUPD)) {
3063 np->n_flag |= NCHG;
3064 if (vrefcnt(vp) == 1 &&
3065 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
3066 VATTR_NULL(&vattr);
3067 if (np->n_flag & NACC)
3068 vattr.va_atime = np->n_atim;
3069 if (np->n_flag & NUPD)
3070 vattr.va_mtime = np->n_mtim;
3071 (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_td);
3072 }
3073 }
3074 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap));
3075 }
3076
3077 /*
3078 * Read wrapper for fifos.
3079 */
3080 static int
3081 nfsfifo_read(struct vop_read_args *ap)
3082 {
3083 struct nfsnode *np = VTONFS(ap->a_vp);
3084
3085 /*
3086 * Set access flag.
3087 */
3088 np->n_flag |= NACC;
3089 getnanotime(&np->n_atim);
3090 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap));
3091 }
3092
3093 /*
3094 * Write wrapper for fifos.
3095 */
3096 static int
3097 nfsfifo_write(struct vop_write_args *ap)
3098 {
3099 struct nfsnode *np = VTONFS(ap->a_vp);
3100
3101 /*
3102 * Set update flag.
3103 */
3104 np->n_flag |= NUPD;
3105 getnanotime(&np->n_mtim);
3106 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap));
3107 }
3108
3109 /*
3110 * Close wrapper for fifos.
3111 *
3112 * Update the times on the nfsnode then do fifo close.
3113 */
3114 static int
3115 nfsfifo_close(struct vop_close_args *ap)
3116 {
3117 struct vnode *vp = ap->a_vp;
3118 struct nfsnode *np = VTONFS(vp);
3119 struct vattr vattr;
3120 struct timespec ts;
3121
3122 if (np->n_flag & (NACC | NUPD)) {
3123 getnanotime(&ts);
3124 if (np->n_flag & NACC)
3125 np->n_atim = ts;
3126 if (np->n_flag & NUPD)
3127 np->n_mtim = ts;
3128 np->n_flag |= NCHG;
3129 if (vrefcnt(vp) == 1 &&
3130 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
3131 VATTR_NULL(&vattr);
3132 if (np->n_flag & NACC)
3133 vattr.va_atime = np->n_atim;
3134 if (np->n_flag & NUPD)
3135 vattr.va_mtime = np->n_mtim;
3136 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, ap->a_td);
3137 (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_td);
3138 VOP_UNLOCK(vp, 0, ap->a_td);
3139 }
3140 }
3141 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap));
3142 }
3143
Cache object: 99f41d3489d3d40a1e46d5c781110b83
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