1 /*
2 * fs/nfsd/nfs4proc.c
3 *
4 * Server-side procedures for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Note: some routines in this file are just trivial wrappers
38 * (e.g. nfsd4_lookup()) defined solely for the sake of consistent
39 * naming. Since all such routines have been declared "inline",
40 * there shouldn't be any associated overhead. At some point in
41 * the future, I might inline these "by hand" to clean up a
42 * little.
43 */
44
45 #include <linux/param.h>
46 #include <linux/major.h>
47 #include <linux/slab.h>
48
49 #include <linux/sunrpc/svc.h>
50 #include <linux/nfsd/nfsd.h>
51 #include <linux/nfsd/cache.h>
52 #include <linux/nfs4.h>
53 #include <linux/nfsd/state.h>
54 #include <linux/nfsd/xdr4.h>
55 #include <linux/nfs4_acl.h>
56
57 #define NFSDDBG_FACILITY NFSDDBG_PROC
58
59 static inline void
60 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
61 {
62 fh_put(dst);
63 dget(src->fh_dentry);
64 if (src->fh_export)
65 cache_get(&src->fh_export->h);
66 *dst = *src;
67 }
68
69 static int
70 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
71 {
72 int accmode, status;
73
74 if (open->op_truncate &&
75 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
76 return nfserr_inval;
77
78 accmode = MAY_NOP;
79 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
80 accmode = MAY_READ;
81 if (open->op_share_deny & NFS4_SHARE_ACCESS_WRITE)
82 accmode |= (MAY_WRITE | MAY_TRUNC);
83 accmode |= MAY_OWNER_OVERRIDE;
84
85 status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
86
87 return status;
88 }
89
90 static int
91 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
92 {
93 struct svc_fh resfh;
94 int status;
95
96 fh_init(&resfh, NFS4_FHSIZE);
97 open->op_truncate = 0;
98
99 if (open->op_create) {
100 /*
101 * Note: create modes (UNCHECKED,GUARDED...) are the same
102 * in NFSv4 as in v3.
103 */
104 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
105 open->op_fname.len, &open->op_iattr,
106 &resfh, open->op_createmode,
107 (u32 *)open->op_verf.data, &open->op_truncate);
108 }
109 else {
110 status = nfsd_lookup(rqstp, current_fh,
111 open->op_fname.data, open->op_fname.len, &resfh);
112 fh_unlock(current_fh);
113 }
114
115 if (!status) {
116 set_change_info(&open->op_cinfo, current_fh);
117
118 /* set reply cache */
119 fh_dup2(current_fh, &resfh);
120 /* XXXJBF: keep a saved svc_fh struct instead?? */
121 open->op_stateowner->so_replay.rp_openfh_len =
122 resfh.fh_handle.fh_size;
123 memcpy(open->op_stateowner->so_replay.rp_openfh,
124 &resfh.fh_handle.fh_base,
125 resfh.fh_handle.fh_size);
126
127 status = do_open_permission(rqstp, current_fh, open);
128 }
129
130 fh_put(&resfh);
131 return status;
132 }
133
134 static int
135 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
136 {
137 int status;
138
139 /* Only reclaims from previously confirmed clients are valid */
140 if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
141 return status;
142
143 /* We don't know the target directory, and therefore can not
144 * set the change info
145 */
146
147 memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
148
149 /* set replay cache */
150 open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size;
151 memcpy(open->op_stateowner->so_replay.rp_openfh,
152 ¤t_fh->fh_handle.fh_base,
153 current_fh->fh_handle.fh_size);
154
155 open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
156 !open->op_iattr.ia_size;
157
158 status = do_open_permission(rqstp, current_fh, open);
159
160 return status;
161 }
162
163
164 static inline int
165 nfsd4_open(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
166 {
167 int status;
168 dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
169 (int)open->op_fname.len, open->op_fname.data,
170 open->op_stateowner);
171
172 if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
173 return nfserr_grace;
174
175 if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
176 return nfserr_no_grace;
177
178 /* This check required by spec. */
179 if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
180 return nfserr_inval;
181
182 nfs4_lock_state();
183
184 /* check seqid for replay. set nfs4_owner */
185 status = nfsd4_process_open1(open);
186 if (status == NFSERR_REPLAY_ME) {
187 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
188 fh_put(current_fh);
189 current_fh->fh_handle.fh_size = rp->rp_openfh_len;
190 memcpy(¤t_fh->fh_handle.fh_base, rp->rp_openfh,
191 rp->rp_openfh_len);
192 status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
193 if (status)
194 dprintk("nfsd4_open: replay failed"
195 " restoring previous filehandle\n");
196 else
197 status = NFSERR_REPLAY_ME;
198 }
199 if (status)
200 goto out;
201 if (open->op_claim_type == NFS4_OPEN_CLAIM_NULL) {
202 /*
203 * This block of code will (1) set CURRENT_FH to the file being opened,
204 * creating it if necessary, (2) set open->op_cinfo,
205 * (3) set open->op_truncate if the file is to be truncated
206 * after opening, (4) do permission checking.
207 */
208 status = do_open_lookup(rqstp, current_fh, open);
209 if (status)
210 goto out;
211 } else if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
212 /*
213 * The CURRENT_FH is already set to the file being opened. This
214 * block of code will (1) set open->op_cinfo, (2) set
215 * open->op_truncate if the file is to be truncated after opening,
216 * (3) do permission checking.
217 */
218 status = do_open_fhandle(rqstp, current_fh, open);
219 if (status)
220 goto out;
221 } else {
222 printk("NFSD: unsupported OPEN claim type\n");
223 status = nfserr_inval;
224 goto out;
225 }
226 /*
227 * nfsd4_process_open2() does the actual opening of the file. If
228 * successful, it (1) truncates the file if open->op_truncate was
229 * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
230 */
231 status = nfsd4_process_open2(rqstp, current_fh, open);
232 out:
233 if (open->op_stateowner)
234 nfs4_get_stateowner(open->op_stateowner);
235 nfs4_unlock_state();
236 return status;
237 }
238
239 /*
240 * filehandle-manipulating ops.
241 */
242 static inline int
243 nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh)
244 {
245 if (!current_fh->fh_dentry)
246 return nfserr_nofilehandle;
247
248 *getfh = current_fh;
249 return nfs_ok;
250 }
251
252 static inline int
253 nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh)
254 {
255 fh_put(current_fh);
256 current_fh->fh_handle.fh_size = putfh->pf_fhlen;
257 memcpy(¤t_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen);
258 return fh_verify(rqstp, current_fh, 0, MAY_NOP);
259 }
260
261 static inline int
262 nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh)
263 {
264 int status;
265
266 fh_put(current_fh);
267 status = exp_pseudoroot(rqstp->rq_client, current_fh,
268 &rqstp->rq_chandle);
269 if (!status)
270 status = nfserrno(nfsd_setuser(rqstp, current_fh->fh_export));
271 return status;
272 }
273
274 static inline int
275 nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
276 {
277 if (!save_fh->fh_dentry)
278 return nfserr_restorefh;
279
280 fh_dup2(current_fh, save_fh);
281 return nfs_ok;
282 }
283
284 static inline int
285 nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
286 {
287 if (!current_fh->fh_dentry)
288 return nfserr_nofilehandle;
289
290 fh_dup2(save_fh, current_fh);
291 return nfs_ok;
292 }
293
294 /*
295 * misc nfsv4 ops
296 */
297 static inline int
298 nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access)
299 {
300 if (access->ac_req_access & ~NFS3_ACCESS_FULL)
301 return nfserr_inval;
302
303 access->ac_resp_access = access->ac_req_access;
304 return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported);
305 }
306
307 static inline int
308 nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit)
309 {
310 int status;
311
312 u32 *p = (u32 *)commit->co_verf.data;
313 *p++ = nfssvc_boot.tv_sec;
314 *p++ = nfssvc_boot.tv_usec;
315
316 status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count);
317 if (status == nfserr_symlink)
318 status = nfserr_inval;
319 return status;
320 }
321
322 static int
323 nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create)
324 {
325 struct svc_fh resfh;
326 int status;
327 dev_t rdev;
328
329 fh_init(&resfh, NFS4_FHSIZE);
330
331 status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE);
332 if (status == nfserr_symlink)
333 status = nfserr_notdir;
334 if (status)
335 return status;
336
337 switch (create->cr_type) {
338 case NF4LNK:
339 /* ugh! we have to null-terminate the linktext, or
340 * vfs_symlink() will choke. it is always safe to
341 * null-terminate by brute force, since at worst we
342 * will overwrite the first byte of the create namelen
343 * in the XDR buffer, which has already been extracted
344 * during XDR decode.
345 */
346 create->cr_linkname[create->cr_linklen] = 0;
347
348 status = nfsd_symlink(rqstp, current_fh, create->cr_name,
349 create->cr_namelen, create->cr_linkname,
350 create->cr_linklen, &resfh, &create->cr_iattr);
351 break;
352
353 case NF4BLK:
354 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
355 if (MAJOR(rdev) != create->cr_specdata1 ||
356 MINOR(rdev) != create->cr_specdata2)
357 return nfserr_inval;
358 status = nfsd_create(rqstp, current_fh, create->cr_name,
359 create->cr_namelen, &create->cr_iattr,
360 S_IFBLK, rdev, &resfh);
361 break;
362
363 case NF4CHR:
364 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
365 if (MAJOR(rdev) != create->cr_specdata1 ||
366 MINOR(rdev) != create->cr_specdata2)
367 return nfserr_inval;
368 status = nfsd_create(rqstp, current_fh, create->cr_name,
369 create->cr_namelen, &create->cr_iattr,
370 S_IFCHR, rdev, &resfh);
371 break;
372
373 case NF4SOCK:
374 status = nfsd_create(rqstp, current_fh, create->cr_name,
375 create->cr_namelen, &create->cr_iattr,
376 S_IFSOCK, 0, &resfh);
377 break;
378
379 case NF4FIFO:
380 status = nfsd_create(rqstp, current_fh, create->cr_name,
381 create->cr_namelen, &create->cr_iattr,
382 S_IFIFO, 0, &resfh);
383 break;
384
385 case NF4DIR:
386 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
387 status = nfsd_create(rqstp, current_fh, create->cr_name,
388 create->cr_namelen, &create->cr_iattr,
389 S_IFDIR, 0, &resfh);
390 break;
391
392 default:
393 status = nfserr_badtype;
394 }
395
396 if (!status) {
397 fh_unlock(current_fh);
398 set_change_info(&create->cr_cinfo, current_fh);
399 fh_dup2(current_fh, &resfh);
400 }
401
402 fh_put(&resfh);
403 return status;
404 }
405
406 static inline int
407 nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr)
408 {
409 int status;
410
411 status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
412 if (status)
413 return status;
414
415 if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
416 return nfserr_inval;
417
418 getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
419 getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
420
421 getattr->ga_fhp = current_fh;
422 return nfs_ok;
423 }
424
425 static inline int
426 nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh,
427 struct svc_fh *save_fh, struct nfsd4_link *link)
428 {
429 int status = nfserr_nofilehandle;
430
431 if (!save_fh->fh_dentry)
432 return status;
433 status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh);
434 if (!status)
435 set_change_info(&link->li_cinfo, current_fh);
436 return status;
437 }
438
439 static int
440 nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh)
441 {
442 struct svc_fh tmp_fh;
443 int ret;
444
445 fh_init(&tmp_fh, NFS4_FHSIZE);
446 if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh,
447 &rqstp->rq_chandle)) != 0)
448 return ret;
449 if (tmp_fh.fh_dentry == current_fh->fh_dentry) {
450 fh_put(&tmp_fh);
451 return nfserr_noent;
452 }
453 fh_put(&tmp_fh);
454 return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh);
455 }
456
457 static inline int
458 nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup)
459 {
460 return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh);
461 }
462
463 static inline int
464 nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read)
465 {
466 int status;
467
468 /* no need to check permission - this will be done in nfsd_read() */
469 if (nfs4_in_grace())
470 return nfserr_grace;
471
472 if (read->rd_offset >= OFFSET_MAX)
473 return nfserr_inval;
474
475 nfs4_lock_state();
476 status = nfs_ok;
477 /* For stateid -1, we don't check share reservations. */
478 if (ONE_STATEID(&read->rd_stateid)) {
479 dprintk("NFSD: nfsd4_read: -1 stateid...\n");
480 goto out;
481 }
482 /*
483 * For stateid 0, the client doesn't have to have the file open, but
484 * we still check for share reservation conflicts.
485 */
486 if (ZERO_STATEID(&read->rd_stateid)) {
487 dprintk("NFSD: nfsd4_read: zero stateid...\n");
488 if ((status = nfs4_share_conflict(current_fh, NFS4_SHARE_DENY_READ))) {
489 dprintk("NFSD: nfsd4_read: conflicting share reservation!\n");
490 goto out;
491 }
492 status = nfs_ok;
493 goto out;
494 }
495 /* check stateid */
496 if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid,
497 CHECK_FH | RD_STATE))) {
498 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
499 goto out;
500 }
501 status = nfs_ok;
502 out:
503 nfs4_unlock_state();
504 read->rd_rqstp = rqstp;
505 read->rd_fhp = current_fh;
506 return status;
507 }
508
509 static inline int
510 nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir)
511 {
512 u64 cookie = readdir->rd_cookie;
513 static const nfs4_verifier zeroverf;
514
515 /* no need to check permission - this will be done in nfsd_readdir() */
516
517 if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
518 return nfserr_inval;
519
520 readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
521 readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
522
523 if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
524 (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
525 return nfserr_bad_cookie;
526
527 readdir->rd_rqstp = rqstp;
528 readdir->rd_fhp = current_fh;
529 return nfs_ok;
530 }
531
532 static inline int
533 nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink)
534 {
535 readlink->rl_rqstp = rqstp;
536 readlink->rl_fhp = current_fh;
537 return nfs_ok;
538 }
539
540 static inline int
541 nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove)
542 {
543 int status;
544
545 status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen);
546 if (status == nfserr_symlink)
547 return nfserr_notdir;
548 if (!status) {
549 fh_unlock(current_fh);
550 set_change_info(&remove->rm_cinfo, current_fh);
551 }
552 return status;
553 }
554
555 static inline int
556 nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh,
557 struct svc_fh *save_fh, struct nfsd4_rename *rename)
558 {
559 int status = nfserr_nofilehandle;
560
561 if (!save_fh->fh_dentry)
562 return status;
563 status = nfsd_rename(rqstp, save_fh, rename->rn_sname,
564 rename->rn_snamelen, current_fh,
565 rename->rn_tname, rename->rn_tnamelen);
566
567 /* the underlying filesystem returns different error's than required
568 * by NFSv4. both save_fh and current_fh have been verified.. */
569 if (status == nfserr_isdir)
570 status = nfserr_exist;
571 else if ((status == nfserr_notdir) &&
572 (S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) &&
573 S_ISDIR(current_fh->fh_dentry->d_inode->i_mode)))
574 status = nfserr_exist;
575 else if (status == nfserr_symlink)
576 status = nfserr_notdir;
577
578 if (!status) {
579 set_change_info(&rename->rn_sinfo, current_fh);
580 set_change_info(&rename->rn_tinfo, save_fh);
581 }
582 return status;
583 }
584
585 static inline int
586 nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr)
587 {
588 int status = nfs_ok;
589
590 if (nfs4_in_grace())
591 return nfserr_grace;
592
593 if (!current_fh->fh_dentry)
594 return nfserr_nofilehandle;
595
596 status = nfs_ok;
597 if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
598
599 status = nfserr_bad_stateid;
600 if (ZERO_STATEID(&setattr->sa_stateid) || ONE_STATEID(&setattr->sa_stateid)) {
601 dprintk("NFSD: nfsd4_setattr: magic stateid!\n");
602 goto out;
603 }
604
605 nfs4_lock_state();
606 if ((status = nfs4_preprocess_stateid_op(current_fh,
607 &setattr->sa_stateid,
608 CHECK_FH | WR_STATE))) {
609 dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
610 goto out_unlock;
611 }
612 nfs4_unlock_state();
613 }
614 status = nfs_ok;
615 if (setattr->sa_acl != NULL)
616 status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl);
617 if (status)
618 goto out;
619 status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr,
620 0, (time_t)0);
621 out:
622 return status;
623 out_unlock:
624 nfs4_unlock_state();
625 return status;
626 }
627
628 static inline int
629 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write)
630 {
631 stateid_t *stateid = &write->wr_stateid;
632 u32 *p;
633 int status = nfs_ok;
634
635 if (nfs4_in_grace())
636 return nfserr_grace;
637
638 /* no need to check permission - this will be done in nfsd_write() */
639
640 if (write->wr_offset >= OFFSET_MAX)
641 return nfserr_inval;
642
643 nfs4_lock_state();
644 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
645 dprintk("NFSD: nfsd4_write: zero stateid...\n");
646 if ((status = nfs4_share_conflict(current_fh, NFS4_SHARE_DENY_WRITE))) {
647 dprintk("NFSD: nfsd4_write: conflicting share reservation!\n");
648 goto out;
649 }
650 goto zero_stateid;
651 }
652 if ((status = nfs4_preprocess_stateid_op(current_fh, stateid,
653 CHECK_FH | WR_STATE))) {
654 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
655 goto out;
656 }
657
658 zero_stateid:
659
660 nfs4_unlock_state();
661 write->wr_bytes_written = write->wr_buflen;
662 write->wr_how_written = write->wr_stable_how;
663 p = (u32 *)write->wr_verifier.data;
664 *p++ = nfssvc_boot.tv_sec;
665 *p++ = nfssvc_boot.tv_usec;
666
667 status = nfsd_write(rqstp, current_fh, write->wr_offset,
668 write->wr_vec, write->wr_vlen, write->wr_buflen,
669 &write->wr_how_written);
670 if (status == nfserr_symlink)
671 status = nfserr_inval;
672 return status;
673 out:
674 nfs4_unlock_state();
675 return status;
676 }
677
678 /* This routine never returns NFS_OK! If there are no other errors, it
679 * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
680 * attributes matched. VERIFY is implemented by mapping NFSERR_SAME
681 * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
682 */
683 static int
684 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify)
685 {
686 u32 *buf, *p;
687 int count;
688 int status;
689
690 status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
691 if (status)
692 return status;
693
694 if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
695 || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
696 return nfserr_attrnotsupp;
697 if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
698 || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
699 return nfserr_inval;
700 if (verify->ve_attrlen & 3)
701 return nfserr_inval;
702
703 /* count in words:
704 * bitmap_len(1) + bitmap(2) + attr_len(1) = 4
705 */
706 count = 4 + (verify->ve_attrlen >> 2);
707 buf = kmalloc(count << 2, GFP_KERNEL);
708 if (!buf)
709 return nfserr_resource;
710
711 status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
712 current_fh->fh_dentry, buf,
713 &count, verify->ve_bmval,
714 rqstp);
715
716 /* this means that nfsd4_encode_fattr() ran out of space */
717 if (status == nfserr_resource && count == 0)
718 status = nfserr_not_same;
719 if (status)
720 goto out_kfree;
721
722 p = buf + 3;
723 status = nfserr_not_same;
724 if (ntohl(*p++) != verify->ve_attrlen)
725 goto out_kfree;
726 if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
727 status = nfserr_same;
728
729 out_kfree:
730 kfree(buf);
731 return status;
732 }
733
734 /*
735 * NULL call.
736 */
737 static int
738 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
739 {
740 return nfs_ok;
741 }
742
743
744 /*
745 * COMPOUND call.
746 */
747 static int
748 nfsd4_proc_compound(struct svc_rqst *rqstp,
749 struct nfsd4_compoundargs *args,
750 struct nfsd4_compoundres *resp)
751 {
752 struct nfsd4_op *op;
753 struct svc_fh *current_fh = NULL;
754 struct svc_fh *save_fh = NULL;
755 struct nfs4_stateowner *replay_owner = NULL;
756 int slack_space; /* in words, not bytes! */
757 int status;
758
759 status = nfserr_resource;
760 current_fh = kmalloc(sizeof(*current_fh), GFP_KERNEL);
761 if (current_fh == NULL)
762 goto out;
763 fh_init(current_fh, NFS4_FHSIZE);
764 save_fh = kmalloc(sizeof(*save_fh), GFP_KERNEL);
765 if (save_fh == NULL)
766 goto out;
767 fh_init(save_fh, NFS4_FHSIZE);
768
769 resp->xbuf = &rqstp->rq_res;
770 resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
771 resp->tagp = resp->p;
772 /* reserve space for: taglen, tag, and opcnt */
773 resp->p += 2 + XDR_QUADLEN(args->taglen);
774 resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
775 resp->taglen = args->taglen;
776 resp->tag = args->tag;
777 resp->opcnt = 0;
778 resp->rqstp = rqstp;
779
780 /*
781 * According to RFC3010, this takes precedence over all other errors.
782 */
783 status = nfserr_minor_vers_mismatch;
784 if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
785 goto out;
786
787 status = nfs_ok;
788 while (!status && resp->opcnt < args->opcnt) {
789 op = &args->ops[resp->opcnt++];
790
791 /*
792 * The XDR decode routines may have pre-set op->status;
793 * for example, if there is a miscellaneous XDR error
794 * it will be set to nfserr_bad_xdr.
795 */
796 if (op->status)
797 goto encode_op;
798
799 /* We must be able to encode a successful response to
800 * this operation, with enough room left over to encode a
801 * failed response to the next operation. If we don't
802 * have enough room, fail with ERR_RESOURCE.
803 */
804 /* FIXME - is slack_space *really* words, or bytes??? - neilb */
805 slack_space = (char *)resp->end - (char *)resp->p;
806 if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) {
807 BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE);
808 op->status = nfserr_resource;
809 goto encode_op;
810 }
811
812 /* All operations except RENEW, SETCLIENTID, RESTOREFH
813 * SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH
814 * require a valid current filehandle
815 *
816 * SETATTR NOFILEHANDLE error handled in nfsd4_setattr
817 * due to required returned bitmap argument
818 */
819 if ((!current_fh->fh_dentry) &&
820 !((op->opnum == OP_PUTFH) || (op->opnum == OP_PUTROOTFH) ||
821 (op->opnum == OP_SETCLIENTID) ||
822 (op->opnum == OP_SETCLIENTID_CONFIRM) ||
823 (op->opnum == OP_RENEW) || (op->opnum == OP_RESTOREFH) ||
824 (op->opnum == OP_RELEASE_LOCKOWNER) ||
825 (op->opnum == OP_SETATTR))) {
826 op->status = nfserr_nofilehandle;
827 goto encode_op;
828 }
829 switch (op->opnum) {
830 case OP_ACCESS:
831 op->status = nfsd4_access(rqstp, current_fh, &op->u.access);
832 break;
833 case OP_CLOSE:
834 op->status = nfsd4_close(rqstp, current_fh, &op->u.close);
835 replay_owner = op->u.close.cl_stateowner;
836 break;
837 case OP_COMMIT:
838 op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit);
839 break;
840 case OP_CREATE:
841 op->status = nfsd4_create(rqstp, current_fh, &op->u.create);
842 break;
843 case OP_DELEGRETURN:
844 op->status = nfsd4_delegreturn(rqstp, current_fh, &op->u.delegreturn);
845 break;
846 case OP_GETATTR:
847 op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr);
848 break;
849 case OP_GETFH:
850 op->status = nfsd4_getfh(current_fh, &op->u.getfh);
851 break;
852 case OP_LINK:
853 op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link);
854 break;
855 case OP_LOCK:
856 op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock);
857 replay_owner = op->u.lock.lk_stateowner;
858 break;
859 case OP_LOCKT:
860 op->status = nfsd4_lockt(rqstp, current_fh, &op->u.lockt);
861 break;
862 case OP_LOCKU:
863 op->status = nfsd4_locku(rqstp, current_fh, &op->u.locku);
864 replay_owner = op->u.locku.lu_stateowner;
865 break;
866 case OP_LOOKUP:
867 op->status = nfsd4_lookup(rqstp, current_fh, &op->u.lookup);
868 break;
869 case OP_LOOKUPP:
870 op->status = nfsd4_lookupp(rqstp, current_fh);
871 break;
872 case OP_NVERIFY:
873 op->status = nfsd4_verify(rqstp, current_fh, &op->u.nverify);
874 if (op->status == nfserr_not_same)
875 op->status = nfs_ok;
876 break;
877 case OP_OPEN:
878 op->status = nfsd4_open(rqstp, current_fh, &op->u.open);
879 replay_owner = op->u.open.op_stateowner;
880 break;
881 case OP_OPEN_CONFIRM:
882 op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm);
883 replay_owner = op->u.open_confirm.oc_stateowner;
884 break;
885 case OP_OPEN_DOWNGRADE:
886 op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade);
887 replay_owner = op->u.open_downgrade.od_stateowner;
888 break;
889 case OP_PUTFH:
890 op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh);
891 break;
892 case OP_PUTROOTFH:
893 op->status = nfsd4_putrootfh(rqstp, current_fh);
894 break;
895 case OP_READ:
896 op->status = nfsd4_read(rqstp, current_fh, &op->u.read);
897 break;
898 case OP_READDIR:
899 op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir);
900 break;
901 case OP_READLINK:
902 op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink);
903 break;
904 case OP_REMOVE:
905 op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove);
906 break;
907 case OP_RENAME:
908 op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename);
909 break;
910 case OP_RENEW:
911 op->status = nfsd4_renew(&op->u.renew);
912 break;
913 case OP_RESTOREFH:
914 op->status = nfsd4_restorefh(current_fh, save_fh);
915 break;
916 case OP_SAVEFH:
917 op->status = nfsd4_savefh(current_fh, save_fh);
918 break;
919 case OP_SETATTR:
920 op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr);
921 break;
922 case OP_SETCLIENTID:
923 op->status = nfsd4_setclientid(rqstp, &op->u.setclientid);
924 break;
925 case OP_SETCLIENTID_CONFIRM:
926 op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm);
927 break;
928 case OP_VERIFY:
929 op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify);
930 if (op->status == nfserr_same)
931 op->status = nfs_ok;
932 break;
933 case OP_WRITE:
934 op->status = nfsd4_write(rqstp, current_fh, &op->u.write);
935 break;
936 case OP_RELEASE_LOCKOWNER:
937 op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner);
938 break;
939 default:
940 BUG_ON(op->status == nfs_ok);
941 break;
942 }
943
944 encode_op:
945 if (op->status == NFSERR_REPLAY_ME) {
946 op->replay = &replay_owner->so_replay;
947 nfsd4_encode_replay(resp, op);
948 status = op->status = op->replay->rp_status;
949 } else {
950 nfsd4_encode_operation(resp, op);
951 status = op->status;
952 }
953 if (replay_owner && (replay_owner != (void *)(-1))) {
954 nfs4_put_stateowner(replay_owner);
955 replay_owner = NULL;
956 }
957 }
958
959 out:
960 nfsd4_release_compoundargs(args);
961 if (current_fh)
962 fh_put(current_fh);
963 kfree(current_fh);
964 if (save_fh)
965 fh_put(save_fh);
966 kfree(save_fh);
967 return status;
968 }
969
970 #define nfs4svc_decode_voidargs NULL
971 #define nfs4svc_release_void NULL
972 #define nfsd4_voidres nfsd4_voidargs
973 #define nfs4svc_release_compound NULL
974 struct nfsd4_voidargs { int dummy; };
975
976 #define PROC(name, argt, rest, relt, cache, respsize) \
977 { (svc_procfunc) nfsd4_proc_##name, \
978 (kxdrproc_t) nfs4svc_decode_##argt##args, \
979 (kxdrproc_t) nfs4svc_encode_##rest##res, \
980 (kxdrproc_t) nfs4svc_release_##relt, \
981 sizeof(struct nfsd4_##argt##args), \
982 sizeof(struct nfsd4_##rest##res), \
983 0, \
984 cache, \
985 respsize, \
986 }
987
988 /*
989 * TODO: At the present time, the NFSv4 server does not do XID caching
990 * of requests. Implementing XID caching would not be a serious problem,
991 * although it would require a mild change in interfaces since one
992 * doesn't know whether an NFSv4 request is idempotent until after the
993 * XDR decode. However, XID caching totally confuses pynfs (Peter
994 * Astrand's regression testsuite for NFSv4 servers), which reuses
995 * XID's liberally, so I've left it unimplemented until pynfs generates
996 * better XID's.
997 */
998 static struct svc_procedure nfsd_procedures4[2] = {
999 PROC(null, void, void, void, RC_NOCACHE, 1),
1000 PROC(compound, compound, compound, compound, RC_NOCACHE, NFSD_BUFSIZE)
1001 };
1002
1003 struct svc_version nfsd_version4 = {
1004 .vs_vers = 4,
1005 .vs_nproc = 2,
1006 .vs_proc = nfsd_procedures4,
1007 .vs_dispatch = nfsd_dispatch,
1008 .vs_xdrsize = NFS4_SVC_XDRSIZE,
1009 };
1010
1011 /*
1012 * Local variables:
1013 * c-basic-offset: 8
1014 * End:
1015 */
1016
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