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ext4: Invert the locking order of page_lock and transaction start
[linux-2.6/x86.git] / fs / nfsd / nfs4proc.c
blobc309c881bd4e4e7a88500ad4c757d8c378216d99
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
38 #include <linux/param.h>
39 #include <linux/major.h>
40 #include <linux/slab.h>
41 #include <linux/file.h>
42
43 #include <linux/sunrpc/svc.h>
44 #include <linux/nfsd/nfsd.h>
45 #include <linux/nfsd/cache.h>
46 #include <linux/nfs4.h>
47 #include <linux/nfsd/state.h>
48 #include <linux/nfsd/xdr4.h>
49 #include <linux/nfs4_acl.h>
50 #include <linux/sunrpc/gss_api.h>
51
52 #define NFSDDBG_FACILITY NFSDDBG_PROC
53
54 static inline void
55 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
56 {
57 fh_put(dst);
58 dget(src->fh_dentry);
59 if (src->fh_export)
60 cache_get(&src->fh_export->h);
61 *dst = *src;
62 }
63
64 static __be32
65 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
66 {
67 __be32 status;
68
69 if (open->op_truncate &&
70 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
71 return nfserr_inval;
72
73 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
74 accmode |= MAY_READ;
75 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
76 accmode |= (MAY_WRITE | MAY_TRUNC);
77 if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
78 accmode |= MAY_WRITE;
79
80 status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
81
82 return status;
83 }
84
85 static __be32
86 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
87 {
88 struct svc_fh resfh;
89 __be32 status;
90 int created = 0;
91
92 fh_init(&resfh, NFS4_FHSIZE);
93 open->op_truncate = 0;
94
95 if (open->op_create) {
96 /*
97 * Note: create modes (UNCHECKED,GUARDED...) are the same
98 * in NFSv4 as in v3.
99 */
100 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
101 open->op_fname.len, &open->op_iattr,
102 &resfh, open->op_createmode,
103 (u32 *)open->op_verf.data,
104 &open->op_truncate, &created);
105
106 /* If we ever decide to use different attrs to store the
107 * verifier in nfsd_create_v3, then we'll need to change this
108 */
109 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
110 open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
111 FATTR4_WORD1_TIME_MODIFY);
112 } else {
113 status = nfsd_lookup(rqstp, current_fh,
114 open->op_fname.data, open->op_fname.len, &resfh);
115 fh_unlock(current_fh);
116 }
117 if (status)
118 goto out;
119
120 set_change_info(&open->op_cinfo, current_fh);
121
122 /* set reply cache */
123 fh_dup2(current_fh, &resfh);
124 open->op_stateowner->so_replay.rp_openfh_len = resfh.fh_handle.fh_size;
125 memcpy(open->op_stateowner->so_replay.rp_openfh,
126 &resfh.fh_handle.fh_base, resfh.fh_handle.fh_size);
127
128 if (!created)
129 status = do_open_permission(rqstp, current_fh, open, MAY_NOP);
130
131 out:
132 fh_put(&resfh);
133 return status;
134 }
135
136 static __be32
137 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
138 {
139 __be32 status;
140
141 /* Only reclaims from previously confirmed clients are valid */
142 if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
143 return status;
144
145 /* We don't know the target directory, and therefore can not
146 * set the change info
147 */
148
149 memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
150
151 /* set replay cache */
152 open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size;
153 memcpy(open->op_stateowner->so_replay.rp_openfh,
154 &current_fh->fh_handle.fh_base,
155 current_fh->fh_handle.fh_size);
156
157 open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
158 (open->op_iattr.ia_size == 0);
159
160 status = do_open_permission(rqstp, current_fh, open, MAY_OWNER_OVERRIDE);
161
162 return status;
163 }
164
165
166 static __be32
167 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
168 struct nfsd4_open *open)
169 {
170 __be32 status;
171 dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
172 (int)open->op_fname.len, open->op_fname.data,
173 open->op_stateowner);
174
175 /* This check required by spec. */
176 if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
177 return nfserr_inval;
178
179 nfs4_lock_state();
180
181 /* check seqid for replay. set nfs4_owner */
182 status = nfsd4_process_open1(open);
183 if (status == nfserr_replay_me) {
184 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
185 fh_put(&cstate->current_fh);
186 cstate->current_fh.fh_handle.fh_size = rp->rp_openfh_len;
187 memcpy(&cstate->current_fh.fh_handle.fh_base, rp->rp_openfh,
188 rp->rp_openfh_len);
189 status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
190 if (status)
191 dprintk("nfsd4_open: replay failed"
192 " restoring previous filehandle\n");
193 else
194 status = nfserr_replay_me;
195 }
196 if (status)
197 goto out;
198
199 /* Openowner is now set, so sequence id will get bumped. Now we need
200 * these checks before we do any creates: */
201 status = nfserr_grace;
202 if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
203 goto out;
204 status = nfserr_no_grace;
205 if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
206 goto out;
207
208 switch (open->op_claim_type) {
209 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
210 status = nfserr_inval;
211 if (open->op_create)
212 goto out;
213 /* fall through */
214 case NFS4_OPEN_CLAIM_NULL:
215 /*
216 * (1) set CURRENT_FH to the file being opened,
217 * creating it if necessary, (2) set open->op_cinfo,
218 * (3) set open->op_truncate if the file is to be
219 * truncated after opening, (4) do permission checking.
220 */
221 status = do_open_lookup(rqstp, &cstate->current_fh,
222 open);
223 if (status)
224 goto out;
225 break;
226 case NFS4_OPEN_CLAIM_PREVIOUS:
227 open->op_stateowner->so_confirmed = 1;
228 /*
229 * The CURRENT_FH is already set to the file being
230 * opened. (1) set open->op_cinfo, (2) set
231 * open->op_truncate if the file is to be truncated
232 * after opening, (3) do permission checking.
233 */
234 status = do_open_fhandle(rqstp, &cstate->current_fh,
235 open);
236 if (status)
237 goto out;
238 break;
239 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
240 open->op_stateowner->so_confirmed = 1;
241 dprintk("NFSD: unsupported OPEN claim type %d\n",
242 open->op_claim_type);
243 status = nfserr_notsupp;
244 goto out;
245 default:
246 dprintk("NFSD: Invalid OPEN claim type %d\n",
247 open->op_claim_type);
248 status = nfserr_inval;
249 goto out;
250 }
251 /*
252 * nfsd4_process_open2() does the actual opening of the file. If
253 * successful, it (1) truncates the file if open->op_truncate was
254 * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
255 */
256 status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
257 out:
258 if (open->op_stateowner) {
259 nfs4_get_stateowner(open->op_stateowner);
260 cstate->replay_owner = open->op_stateowner;
261 }
262 nfs4_unlock_state();
263 return status;
264 }
265
266 /*
267 * filehandle-manipulating ops.
268 */
269 static __be32
270 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
271 struct svc_fh **getfh)
272 {
273 if (!cstate->current_fh.fh_dentry)
274 return nfserr_nofilehandle;
275
276 *getfh = &cstate->current_fh;
277 return nfs_ok;
278 }
279
280 static __be32
281 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
282 struct nfsd4_putfh *putfh)
283 {
284 fh_put(&cstate->current_fh);
285 cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
286 memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
287 putfh->pf_fhlen);
288 return fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
289 }
290
291 static __be32
292 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
293 void *arg)
294 {
295 __be32 status;
296
297 fh_put(&cstate->current_fh);
298 status = exp_pseudoroot(rqstp, &cstate->current_fh);
299 return status;
300 }
301
302 static __be32
303 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
304 void *arg)
305 {
306 if (!cstate->save_fh.fh_dentry)
307 return nfserr_restorefh;
308
309 fh_dup2(&cstate->current_fh, &cstate->save_fh);
310 return nfs_ok;
311 }
312
313 static __be32
314 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
315 void *arg)
316 {
317 if (!cstate->current_fh.fh_dentry)
318 return nfserr_nofilehandle;
319
320 fh_dup2(&cstate->save_fh, &cstate->current_fh);
321 return nfs_ok;
322 }
323
324 /*
325 * misc nfsv4 ops
326 */
327 static __be32
328 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
329 struct nfsd4_access *access)
330 {
331 if (access->ac_req_access & ~NFS3_ACCESS_FULL)
332 return nfserr_inval;
333
334 access->ac_resp_access = access->ac_req_access;
335 return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
336 &access->ac_supported);
337 }
338
339 static __be32
340 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
341 struct nfsd4_commit *commit)
342 {
343 __be32 status;
344
345 u32 *p = (u32 *)commit->co_verf.data;
346 *p++ = nfssvc_boot.tv_sec;
347 *p++ = nfssvc_boot.tv_usec;
348
349 status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
350 commit->co_count);
351 if (status == nfserr_symlink)
352 status = nfserr_inval;
353 return status;
354 }
355
356 static __be32
357 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
358 struct nfsd4_create *create)
359 {
360 struct svc_fh resfh;
361 __be32 status;
362 dev_t rdev;
363
364 fh_init(&resfh, NFS4_FHSIZE);
365
366 status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, MAY_CREATE);
367 if (status == nfserr_symlink)
368 status = nfserr_notdir;
369 if (status)
370 return status;
371
372 switch (create->cr_type) {
373 case NF4LNK:
374 /* ugh! we have to null-terminate the linktext, or
375 * vfs_symlink() will choke. it is always safe to
376 * null-terminate by brute force, since at worst we
377 * will overwrite the first byte of the create namelen
378 * in the XDR buffer, which has already been extracted
379 * during XDR decode.
380 */
381 create->cr_linkname[create->cr_linklen] = 0;
382
383 status = nfsd_symlink(rqstp, &cstate->current_fh,
384 create->cr_name, create->cr_namelen,
385 create->cr_linkname, create->cr_linklen,
386 &resfh, &create->cr_iattr);
387 break;
388
389 case NF4BLK:
390 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
391 if (MAJOR(rdev) != create->cr_specdata1 ||
392 MINOR(rdev) != create->cr_specdata2)
393 return nfserr_inval;
394 status = nfsd_create(rqstp, &cstate->current_fh,
395 create->cr_name, create->cr_namelen,
396 &create->cr_iattr, S_IFBLK, rdev, &resfh);
397 break;
398
399 case NF4CHR:
400 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
401 if (MAJOR(rdev) != create->cr_specdata1 ||
402 MINOR(rdev) != create->cr_specdata2)
403 return nfserr_inval;
404 status = nfsd_create(rqstp, &cstate->current_fh,
405 create->cr_name, create->cr_namelen,
406 &create->cr_iattr,S_IFCHR, rdev, &resfh);
407 break;
408
409 case NF4SOCK:
410 status = nfsd_create(rqstp, &cstate->current_fh,
411 create->cr_name, create->cr_namelen,
412 &create->cr_iattr, S_IFSOCK, 0, &resfh);
413 break;
414
415 case NF4FIFO:
416 status = nfsd_create(rqstp, &cstate->current_fh,
417 create->cr_name, create->cr_namelen,
418 &create->cr_iattr, S_IFIFO, 0, &resfh);
419 break;
420
421 case NF4DIR:
422 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
423 status = nfsd_create(rqstp, &cstate->current_fh,
424 create->cr_name, create->cr_namelen,
425 &create->cr_iattr, S_IFDIR, 0, &resfh);
426 break;
427
428 default:
429 status = nfserr_badtype;
430 }
431
432 if (!status) {
433 fh_unlock(&cstate->current_fh);
434 set_change_info(&create->cr_cinfo, &cstate->current_fh);
435 fh_dup2(&cstate->current_fh, &resfh);
436 }
437
438 fh_put(&resfh);
439 return status;
440 }
441
442 static __be32
443 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
444 struct nfsd4_getattr *getattr)
445 {
446 __be32 status;
447
448 status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
449 if (status)
450 return status;
451
452 if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
453 return nfserr_inval;
454
455 getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
456 getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
457
458 getattr->ga_fhp = &cstate->current_fh;
459 return nfs_ok;
460 }
461
462 static __be32
463 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
464 struct nfsd4_link *link)
465 {
466 __be32 status = nfserr_nofilehandle;
467
468 if (!cstate->save_fh.fh_dentry)
469 return status;
470 status = nfsd_link(rqstp, &cstate->current_fh,
471 link->li_name, link->li_namelen, &cstate->save_fh);
472 if (!status)
473 set_change_info(&link->li_cinfo, &cstate->current_fh);
474 return status;
475 }
476
477 static __be32
478 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
479 void *arg)
480 {
481 struct svc_fh tmp_fh;
482 __be32 ret;
483
484 fh_init(&tmp_fh, NFS4_FHSIZE);
485 ret = exp_pseudoroot(rqstp, &tmp_fh);
486 if (ret)
487 return ret;
488 if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
489 fh_put(&tmp_fh);
490 return nfserr_noent;
491 }
492 fh_put(&tmp_fh);
493 return nfsd_lookup(rqstp, &cstate->current_fh,
494 "..", 2, &cstate->current_fh);
495 }
496
497 static __be32
498 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
499 struct nfsd4_lookup *lookup)
500 {
501 return nfsd_lookup(rqstp, &cstate->current_fh,
502 lookup->lo_name, lookup->lo_len,
503 &cstate->current_fh);
504 }
505
506 static __be32
507 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
508 struct nfsd4_read *read)
509 {
510 __be32 status;
511
512 /* no need to check permission - this will be done in nfsd_read() */
513
514 read->rd_filp = NULL;
515 if (read->rd_offset >= OFFSET_MAX)
516 return nfserr_inval;
517
518 nfs4_lock_state();
519 /* check stateid */
520 if ((status = nfs4_preprocess_stateid_op(&cstate->current_fh,
521 &read->rd_stateid,
522 CHECK_FH | RD_STATE, &read->rd_filp))) {
523 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
524 goto out;
525 }
526 if (read->rd_filp)
527 get_file(read->rd_filp);
528 status = nfs_ok;
529 out:
530 nfs4_unlock_state();
531 read->rd_rqstp = rqstp;
532 read->rd_fhp = &cstate->current_fh;
533 return status;
534 }
535
536 static __be32
537 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
538 struct nfsd4_readdir *readdir)
539 {
540 u64 cookie = readdir->rd_cookie;
541 static const nfs4_verifier zeroverf;
542
543 /* no need to check permission - this will be done in nfsd_readdir() */
544
545 if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
546 return nfserr_inval;
547
548 readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
549 readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
550
551 if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
552 (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
553 return nfserr_bad_cookie;
554
555 readdir->rd_rqstp = rqstp;
556 readdir->rd_fhp = &cstate->current_fh;
557 return nfs_ok;
558 }
559
560 static __be32
561 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
562 struct nfsd4_readlink *readlink)
563 {
564 readlink->rl_rqstp = rqstp;
565 readlink->rl_fhp = &cstate->current_fh;
566 return nfs_ok;
567 }
568
569 static __be32
570 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
571 struct nfsd4_remove *remove)
572 {
573 __be32 status;
574
575 if (nfs4_in_grace())
576 return nfserr_grace;
577 status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
578 remove->rm_name, remove->rm_namelen);
579 if (status == nfserr_symlink)
580 return nfserr_notdir;
581 if (!status) {
582 fh_unlock(&cstate->current_fh);
583 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
584 }
585 return status;
586 }
587
588 static __be32
589 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
590 struct nfsd4_rename *rename)
591 {
592 __be32 status = nfserr_nofilehandle;
593
594 if (!cstate->save_fh.fh_dentry)
595 return status;
596 if (nfs4_in_grace() && !(cstate->save_fh.fh_export->ex_flags
597 & NFSEXP_NOSUBTREECHECK))
598 return nfserr_grace;
599 status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
600 rename->rn_snamelen, &cstate->current_fh,
601 rename->rn_tname, rename->rn_tnamelen);
602
603 /* the underlying filesystem returns different error's than required
604 * by NFSv4. both save_fh and current_fh have been verified.. */
605 if (status == nfserr_isdir)
606 status = nfserr_exist;
607 else if ((status == nfserr_notdir) &&
608 (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
609 S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
610 status = nfserr_exist;
611 else if (status == nfserr_symlink)
612 status = nfserr_notdir;
613
614 if (!status) {
615 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
616 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
617 }
618 return status;
619 }
620
621 static __be32
622 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
623 struct nfsd4_secinfo *secinfo)
624 {
625 struct svc_fh resfh;
626 struct svc_export *exp;
627 struct dentry *dentry;
628 __be32 err;
629
630 fh_init(&resfh, NFS4_FHSIZE);
631 err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
632 secinfo->si_name, secinfo->si_namelen,
633 &exp, &dentry);
634 if (err)
635 return err;
636 if (dentry->d_inode == NULL) {
637 exp_put(exp);
638 err = nfserr_noent;
639 } else
640 secinfo->si_exp = exp;
641 dput(dentry);
642 return err;
643 }
644
645 static __be32
646 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
647 struct nfsd4_setattr *setattr)
648 {
649 __be32 status = nfs_ok;
650
651 if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
652 nfs4_lock_state();
653 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
654 &setattr->sa_stateid, CHECK_FH | WR_STATE, NULL);
655 nfs4_unlock_state();
656 if (status) {
657 dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
658 return status;
659 }
660 }
661 status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
662 if (status)
663 return status;
664 status = nfs_ok;
665 if (setattr->sa_acl != NULL)
666 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
667 setattr->sa_acl);
668 if (status)
669 goto out;
670 status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
671 0, (time_t)0);
672 out:
673 mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
674 return status;
675 }
676
677 static __be32
678 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
679 struct nfsd4_write *write)
680 {
681 stateid_t *stateid = &write->wr_stateid;
682 struct file *filp = NULL;
683 u32 *p;
684 __be32 status = nfs_ok;
685
686 /* no need to check permission - this will be done in nfsd_write() */
687
688 if (write->wr_offset >= OFFSET_MAX)
689 return nfserr_inval;
690
691 nfs4_lock_state();
692 status = nfs4_preprocess_stateid_op(&cstate->current_fh, stateid,
693 CHECK_FH | WR_STATE, &filp);
694 if (filp)
695 get_file(filp);
696 nfs4_unlock_state();
697
698 if (status) {
699 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
700 return status;
701 }
702
703 write->wr_bytes_written = write->wr_buflen;
704 write->wr_how_written = write->wr_stable_how;
705 p = (u32 *)write->wr_verifier.data;
706 *p++ = nfssvc_boot.tv_sec;
707 *p++ = nfssvc_boot.tv_usec;
708
709 status = nfsd_write(rqstp, &cstate->current_fh, filp,
710 write->wr_offset, rqstp->rq_vec, write->wr_vlen,
711 write->wr_buflen, &write->wr_how_written);
712 if (filp)
713 fput(filp);
714
715 if (status == nfserr_symlink)
716 status = nfserr_inval;
717 return status;
718 }
719
720 /* This routine never returns NFS_OK! If there are no other errors, it
721 * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
722 * attributes matched. VERIFY is implemented by mapping NFSERR_SAME
723 * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
724 */
725 static __be32
726 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
727 struct nfsd4_verify *verify)
728 {
729 __be32 *buf, *p;
730 int count;
731 __be32 status;
732
733 status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
734 if (status)
735 return status;
736
737 if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
738 || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
739 return nfserr_attrnotsupp;
740 if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
741 || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
742 return nfserr_inval;
743 if (verify->ve_attrlen & 3)
744 return nfserr_inval;
745
746 /* count in words:
747 * bitmap_len(1) + bitmap(2) + attr_len(1) = 4
748 */
749 count = 4 + (verify->ve_attrlen >> 2);
750 buf = kmalloc(count << 2, GFP_KERNEL);
751 if (!buf)
752 return nfserr_resource;
753
754 status = nfsd4_encode_fattr(&cstate->current_fh,
755 cstate->current_fh.fh_export,
756 cstate->current_fh.fh_dentry, buf,
757 &count, verify->ve_bmval,
758 rqstp, 0);
759
760 /* this means that nfsd4_encode_fattr() ran out of space */
761 if (status == nfserr_resource && count == 0)
762 status = nfserr_not_same;
763 if (status)
764 goto out_kfree;
765
766 p = buf + 3;
767 status = nfserr_not_same;
768 if (ntohl(*p++) != verify->ve_attrlen)
769 goto out_kfree;
770 if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
771 status = nfserr_same;
772
773 out_kfree:
774 kfree(buf);
775 return status;
776 }
777
778 static __be32
779 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
780 struct nfsd4_verify *verify)
781 {
782 __be32 status;
783
784 status = _nfsd4_verify(rqstp, cstate, verify);
785 return status == nfserr_not_same ? nfs_ok : status;
786 }
787
788 static __be32
789 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
790 struct nfsd4_verify *verify)
791 {
792 __be32 status;
793
794 status = _nfsd4_verify(rqstp, cstate, verify);
795 return status == nfserr_same ? nfs_ok : status;
796 }
797
798 /*
799 * NULL call.
800 */
801 static __be32
802 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
803 {
804 return nfs_ok;
805 }
806
807 static inline void nfsd4_increment_op_stats(u32 opnum)
808 {
809 if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
810 nfsdstats.nfs4_opcount[opnum]++;
811 }
812
813 static void cstate_free(struct nfsd4_compound_state *cstate)
814 {
815 if (cstate == NULL)
816 return;
817 fh_put(&cstate->current_fh);
818 fh_put(&cstate->save_fh);
819 BUG_ON(cstate->replay_owner);
820 kfree(cstate);
821 }
822
823 static struct nfsd4_compound_state *cstate_alloc(void)
824 {
825 struct nfsd4_compound_state *cstate;
826
827 cstate = kmalloc(sizeof(struct nfsd4_compound_state), GFP_KERNEL);
828 if (cstate == NULL)
829 return NULL;
830 fh_init(&cstate->current_fh, NFS4_FHSIZE);
831 fh_init(&cstate->save_fh, NFS4_FHSIZE);
832 cstate->replay_owner = NULL;
833 return cstate;
834 }
835
836 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
837 void *);
838
839 struct nfsd4_operation {
840 nfsd4op_func op_func;
841 u32 op_flags;
842 /* Most ops require a valid current filehandle; a few don't: */
843 #define ALLOWED_WITHOUT_FH 1
844 /* GETATTR and ops not listed as returning NFS4ERR_MOVED: */
845 #define ALLOWED_ON_ABSENT_FS 2
846 };
847
848 static struct nfsd4_operation nfsd4_ops[];
849
850 /*
851 * COMPOUND call.
852 */
853 static __be32
854 nfsd4_proc_compound(struct svc_rqst *rqstp,
855 struct nfsd4_compoundargs *args,
856 struct nfsd4_compoundres *resp)
857 {
858 struct nfsd4_op *op;
859 struct nfsd4_operation *opdesc;
860 struct nfsd4_compound_state *cstate = NULL;
861 int slack_bytes;
862 __be32 status;
863
864 status = nfserr_resource;
865 cstate = cstate_alloc();
866 if (cstate == NULL)
867 goto out;
868
869 resp->xbuf = &rqstp->rq_res;
870 resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
871 resp->tagp = resp->p;
872 /* reserve space for: taglen, tag, and opcnt */
873 resp->p += 2 + XDR_QUADLEN(args->taglen);
874 resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
875 resp->taglen = args->taglen;
876 resp->tag = args->tag;
877 resp->opcnt = 0;
878 resp->rqstp = rqstp;
879
880 /*
881 * According to RFC3010, this takes precedence over all other errors.
882 */
883 status = nfserr_minor_vers_mismatch;
884 if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
885 goto out;
886
887 status = nfs_ok;
888 while (!status && resp->opcnt < args->opcnt) {
889 op = &args->ops[resp->opcnt++];
890
891 dprintk("nfsv4 compound op #%d: %d\n", resp->opcnt, op->opnum);
892
893 /*
894 * The XDR decode routines may have pre-set op->status;
895 * for example, if there is a miscellaneous XDR error
896 * it will be set to nfserr_bad_xdr.
897 */
898 if (op->status)
899 goto encode_op;
900
901 /* We must be able to encode a successful response to
902 * this operation, with enough room left over to encode a
903 * failed response to the next operation. If we don't
904 * have enough room, fail with ERR_RESOURCE.
905 */
906 slack_bytes = (char *)resp->end - (char *)resp->p;
907 if (slack_bytes < COMPOUND_SLACK_SPACE
908 + COMPOUND_ERR_SLACK_SPACE) {
909 BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
910 op->status = nfserr_resource;
911 goto encode_op;
912 }
913
914 opdesc = &nfsd4_ops[op->opnum];
915
916 if (!cstate->current_fh.fh_dentry) {
917 if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
918 op->status = nfserr_nofilehandle;
919 goto encode_op;
920 }
921 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
922 !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
923 op->status = nfserr_moved;
924 goto encode_op;
925 }
926
927 if (opdesc->op_func)
928 op->status = opdesc->op_func(rqstp, cstate, &op->u);
929 else
930 BUG_ON(op->status == nfs_ok);
931
932 encode_op:
933 if (op->status == nfserr_replay_me) {
934 op->replay = &cstate->replay_owner->so_replay;
935 nfsd4_encode_replay(resp, op);
936 status = op->status = op->replay->rp_status;
937 } else {
938 nfsd4_encode_operation(resp, op);
939 status = op->status;
940 }
941 if (cstate->replay_owner) {
942 nfs4_put_stateowner(cstate->replay_owner);
943 cstate->replay_owner = NULL;
944 }
945 /* XXX Ugh, we need to get rid of this kind of special case: */
946 if (op->opnum == OP_READ && op->u.read.rd_filp)
947 fput(op->u.read.rd_filp);
948
949 nfsd4_increment_op_stats(op->opnum);
950 }
951
952 out:
953 nfsd4_release_compoundargs(args);
954 cstate_free(cstate);
955 return status;
956 }
957
958 static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = {
959 [OP_ACCESS] = {
960 .op_func = (nfsd4op_func)nfsd4_access,
961 },
962 [OP_CLOSE] = {
963 .op_func = (nfsd4op_func)nfsd4_close,
964 },
965 [OP_COMMIT] = {
966 .op_func = (nfsd4op_func)nfsd4_commit,
967 },
968 [OP_CREATE] = {
969 .op_func = (nfsd4op_func)nfsd4_create,
970 },
971 [OP_DELEGRETURN] = {
972 .op_func = (nfsd4op_func)nfsd4_delegreturn,
973 },
974 [OP_GETATTR] = {
975 .op_func = (nfsd4op_func)nfsd4_getattr,
976 .op_flags = ALLOWED_ON_ABSENT_FS,
977 },
978 [OP_GETFH] = {
979 .op_func = (nfsd4op_func)nfsd4_getfh,
980 },
981 [OP_LINK] = {
982 .op_func = (nfsd4op_func)nfsd4_link,
983 },
984 [OP_LOCK] = {
985 .op_func = (nfsd4op_func)nfsd4_lock,
986 },
987 [OP_LOCKT] = {
988 .op_func = (nfsd4op_func)nfsd4_lockt,
989 },
990 [OP_LOCKU] = {
991 .op_func = (nfsd4op_func)nfsd4_locku,
992 },
993 [OP_LOOKUP] = {
994 .op_func = (nfsd4op_func)nfsd4_lookup,
995 },
996 [OP_LOOKUPP] = {
997 .op_func = (nfsd4op_func)nfsd4_lookupp,
998 },
999 [OP_NVERIFY] = {
1000 .op_func = (nfsd4op_func)nfsd4_nverify,
1001 },
1002 [OP_OPEN] = {
1003 .op_func = (nfsd4op_func)nfsd4_open,
1004 },
1005 [OP_OPEN_CONFIRM] = {
1006 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1007 },
1008 [OP_OPEN_DOWNGRADE] = {
1009 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1010 },
1011 [OP_PUTFH] = {
1012 .op_func = (nfsd4op_func)nfsd4_putfh,
1013 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1014 },
1015 [OP_PUTPUBFH] = {
1016 /* unsupported; just for future reference: */
1017 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1018 },
1019 [OP_PUTROOTFH] = {
1020 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1021 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1022 },
1023 [OP_READ] = {
1024 .op_func = (nfsd4op_func)nfsd4_read,
1025 },
1026 [OP_READDIR] = {
1027 .op_func = (nfsd4op_func)nfsd4_readdir,
1028 },
1029 [OP_READLINK] = {
1030 .op_func = (nfsd4op_func)nfsd4_readlink,
1031 },
1032 [OP_REMOVE] = {
1033 .op_func = (nfsd4op_func)nfsd4_remove,
1034 },
1035 [OP_RENAME] = {
1036 .op_func = (nfsd4op_func)nfsd4_rename,
1037 },
1038 [OP_RENEW] = {
1039 .op_func = (nfsd4op_func)nfsd4_renew,
1040 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1041 },
1042 [OP_RESTOREFH] = {
1043 .op_func = (nfsd4op_func)nfsd4_restorefh,
1044 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1045 },
1046 [OP_SAVEFH] = {
1047 .op_func = (nfsd4op_func)nfsd4_savefh,
1048 },
1049 [OP_SECINFO] = {
1050 .op_func = (nfsd4op_func)nfsd4_secinfo,
1051 },
1052 [OP_SETATTR] = {
1053 .op_func = (nfsd4op_func)nfsd4_setattr,
1054 },
1055 [OP_SETCLIENTID] = {
1056 .op_func = (nfsd4op_func)nfsd4_setclientid,
1057 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1058 },
1059 [OP_SETCLIENTID_CONFIRM] = {
1060 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1061 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1062 },
1063 [OP_VERIFY] = {
1064 .op_func = (nfsd4op_func)nfsd4_verify,
1065 },
1066 [OP_WRITE] = {
1067 .op_func = (nfsd4op_func)nfsd4_write,
1068 },
1069 [OP_RELEASE_LOCKOWNER] = {
1070 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1071 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1072 },
1073 };
1074
1075 #define nfs4svc_decode_voidargs NULL
1076 #define nfs4svc_release_void NULL
1077 #define nfsd4_voidres nfsd4_voidargs
1078 #define nfs4svc_release_compound NULL
1079 struct nfsd4_voidargs { int dummy; };
1080
1081 #define PROC(name, argt, rest, relt, cache, respsize) \
1082 { (svc_procfunc) nfsd4_proc_##name, \
1083 (kxdrproc_t) nfs4svc_decode_##argt##args, \
1084 (kxdrproc_t) nfs4svc_encode_##rest##res, \
1085 (kxdrproc_t) nfs4svc_release_##relt, \
1086 sizeof(struct nfsd4_##argt##args), \
1087 sizeof(struct nfsd4_##rest##res), \
1088 0, \
1089 cache, \
1090 respsize, \
1091 }
1092
1093 /*
1094 * TODO: At the present time, the NFSv4 server does not do XID caching
1095 * of requests. Implementing XID caching would not be a serious problem,
1096 * although it would require a mild change in interfaces since one
1097 * doesn't know whether an NFSv4 request is idempotent until after the
1098 * XDR decode. However, XID caching totally confuses pynfs (Peter
1099 * Astrand's regression testsuite for NFSv4 servers), which reuses
1100 * XID's liberally, so I've left it unimplemented until pynfs generates
1101 * better XID's.
1102 */
1103 static struct svc_procedure nfsd_procedures4[2] = {
1104 PROC(null, void, void, void, RC_NOCACHE, 1),
1105 PROC(compound, compound, compound, compound, RC_NOCACHE, NFSD_BUFSIZE/4)
1106 };
1107
1108 struct svc_version nfsd_version4 = {
1109 .vs_vers = 4,
1110 .vs_nproc = 2,
1111 .vs_proc = nfsd_procedures4,
1112 .vs_dispatch = nfsd_dispatch,
1113 .vs_xdrsize = NFS4_SVC_XDRSIZE,
1114 };
1115
1116 /*
1117 * Local variables:
1118 * c-basic-offset: 8
1119 * End:
1120 */
x86 "subsystem" repository