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added 2.6.29.6 aldebaran kernel
[nao-ulib.git] / kernel / 2.6.29.6-aldebaran-rt / fs / nfsd / nfs4xdr.c
blob4c5fb99cdb0c25aea7aba225ceac87f45b3401f4
1 /*
2 * Server-side XDR for NFSv4
3 *
4 * Copyright (c) 2002 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <andros@umich.edu>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 * TODO: Neil Brown made the following observation: We currently
36 * initially reserve NFSD_BUFSIZE space on the transmit queue and
37 * never release any of that until the request is complete.
38 * It would be good to calculate a new maximum response size while
39 * decoding the COMPOUND, and call svc_reserve with this number
40 * at the end of nfs4svc_decode_compoundargs.
41 */
42
43 #include <linux/param.h>
44 #include <linux/smp.h>
45 #include <linux/fs.h>
46 #include <linux/namei.h>
47 #include <linux/vfs.h>
48 #include <linux/sunrpc/xdr.h>
49 #include <linux/sunrpc/svc.h>
50 #include <linux/sunrpc/clnt.h>
51 #include <linux/nfsd/nfsd.h>
52 #include <linux/nfsd/state.h>
53 #include <linux/nfsd/xdr4.h>
54 #include <linux/nfsd_idmap.h>
55 #include <linux/nfs4.h>
56 #include <linux/nfs4_acl.h>
57 #include <linux/sunrpc/gss_api.h>
58 #include <linux/sunrpc/svcauth_gss.h>
59
60 #define NFSDDBG_FACILITY NFSDDBG_XDR
61
62 /*
63 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
64 * directory in order to indicate to the client that a filesystem boundary is present
65 * We use a fixed fsid for a referral
66 */
67 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
68 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
69
70 static __be32
71 check_filename(char *str, int len, __be32 err)
72 {
73 int i;
74
75 if (len == 0)
76 return nfserr_inval;
77 if (isdotent(str, len))
78 return err;
79 for (i = 0; i < len; i++)
80 if (str[i] == '/')
81 return err;
82 return 0;
83 }
84
85 /*
86 * START OF "GENERIC" DECODE ROUTINES.
87 * These may look a little ugly since they are imported from a "generic"
88 * set of XDR encode/decode routines which are intended to be shared by
89 * all of our NFSv4 implementations (OpenBSD, MacOS X...).
90 *
91 * If the pain of reading these is too great, it should be a straightforward
92 * task to translate them into Linux-specific versions which are more
93 * consistent with the style used in NFSv2/v3...
94 */
95 #define DECODE_HEAD \
96 __be32 *p; \
97 __be32 status
98 #define DECODE_TAIL \
99 status = 0; \
100 out: \
101 return status; \
102 xdr_error: \
103 dprintk("NFSD: xdr error (%s:%d)\n", \
104 __FILE__, __LINE__); \
105 status = nfserr_bad_xdr; \
106 goto out
107
108 #define READ32(x) (x) = ntohl(*p++)
109 #define READ64(x) do { \
110 (x) = (u64)ntohl(*p++) << 32; \
111 (x) |= ntohl(*p++); \
112 } while (0)
113 #define READTIME(x) do { \
114 p++; \
115 (x) = ntohl(*p++); \
116 p++; \
117 } while (0)
118 #define READMEM(x,nbytes) do { \
119 x = (char *)p; \
120 p += XDR_QUADLEN(nbytes); \
121 } while (0)
122 #define SAVEMEM(x,nbytes) do { \
123 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
124 savemem(argp, p, nbytes) : \
125 (char *)p)) { \
126 dprintk("NFSD: xdr error (%s:%d)\n", \
127 __FILE__, __LINE__); \
128 goto xdr_error; \
129 } \
130 p += XDR_QUADLEN(nbytes); \
131 } while (0)
132 #define COPYMEM(x,nbytes) do { \
133 memcpy((x), p, nbytes); \
134 p += XDR_QUADLEN(nbytes); \
135 } while (0)
136
137 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
138 #define READ_BUF(nbytes) do { \
139 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
140 p = argp->p; \
141 argp->p += XDR_QUADLEN(nbytes); \
142 } else if (!(p = read_buf(argp, nbytes))) { \
143 dprintk("NFSD: xdr error (%s:%d)\n", \
144 __FILE__, __LINE__); \
145 goto xdr_error; \
146 } \
147 } while (0)
148
149 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
150 {
151 /* We want more bytes than seem to be available.
152 * Maybe we need a new page, maybe we have just run out
153 */
154 unsigned int avail = (char *)argp->end - (char *)argp->p;
155 __be32 *p;
156 if (avail + argp->pagelen < nbytes)
157 return NULL;
158 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
159 return NULL;
160 /* ok, we can do it with the current plus the next page */
161 if (nbytes <= sizeof(argp->tmp))
162 p = argp->tmp;
163 else {
164 kfree(argp->tmpp);
165 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
166 if (!p)
167 return NULL;
168
169 }
170 /*
171 * The following memcpy is safe because read_buf is always
172 * called with nbytes > avail, and the two cases above both
173 * guarantee p points to at least nbytes bytes.
174 */
175 memcpy(p, argp->p, avail);
176 /* step to next page */
177 argp->p = page_address(argp->pagelist[0]);
178 argp->pagelist++;
179 if (argp->pagelen < PAGE_SIZE) {
180 argp->end = p + (argp->pagelen>>2);
181 argp->pagelen = 0;
182 } else {
183 argp->end = p + (PAGE_SIZE>>2);
184 argp->pagelen -= PAGE_SIZE;
185 }
186 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
187 argp->p += XDR_QUADLEN(nbytes - avail);
188 return p;
189 }
190
191 static int
192 defer_free(struct nfsd4_compoundargs *argp,
193 void (*release)(const void *), void *p)
194 {
195 struct tmpbuf *tb;
196
197 tb = kmalloc(sizeof(*tb), GFP_KERNEL);
198 if (!tb)
199 return -ENOMEM;
200 tb->buf = p;
201 tb->release = release;
202 tb->next = argp->to_free;
203 argp->to_free = tb;
204 return 0;
205 }
206
207 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
208 {
209 if (p == argp->tmp) {
210 p = kmalloc(nbytes, GFP_KERNEL);
211 if (!p)
212 return NULL;
213 memcpy(p, argp->tmp, nbytes);
214 } else {
215 BUG_ON(p != argp->tmpp);
216 argp->tmpp = NULL;
217 }
218 if (defer_free(argp, kfree, p)) {
219 kfree(p);
220 return NULL;
221 } else
222 return (char *)p;
223 }
224
225 static __be32
226 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
227 {
228 u32 bmlen;
229 DECODE_HEAD;
230
231 bmval[0] = 0;
232 bmval[1] = 0;
233
234 READ_BUF(4);
235 READ32(bmlen);
236 if (bmlen > 1000)
237 goto xdr_error;
238
239 READ_BUF(bmlen << 2);
240 if (bmlen > 0)
241 READ32(bmval[0]);
242 if (bmlen > 1)
243 READ32(bmval[1]);
244
245 DECODE_TAIL;
246 }
247
248 static __be32
249 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
250 struct nfs4_acl **acl)
251 {
252 int expected_len, len = 0;
253 u32 dummy32;
254 char *buf;
255 int host_err;
256
257 DECODE_HEAD;
258 iattr->ia_valid = 0;
259 if ((status = nfsd4_decode_bitmap(argp, bmval)))
260 return status;
261
262 /*
263 * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
264 * read-only attributes return ERR_INVAL.
265 */
266 if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
267 return nfserr_attrnotsupp;
268 if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
269 return nfserr_inval;
270
271 READ_BUF(4);
272 READ32(expected_len);
273
274 if (bmval[0] & FATTR4_WORD0_SIZE) {
275 READ_BUF(8);
276 len += 8;
277 READ64(iattr->ia_size);
278 iattr->ia_valid |= ATTR_SIZE;
279 }
280 if (bmval[0] & FATTR4_WORD0_ACL) {
281 int nace;
282 struct nfs4_ace *ace;
283
284 READ_BUF(4); len += 4;
285 READ32(nace);
286
287 if (nace > NFS4_ACL_MAX)
288 return nfserr_resource;
289
290 *acl = nfs4_acl_new(nace);
291 if (*acl == NULL) {
292 host_err = -ENOMEM;
293 goto out_nfserr;
294 }
295 defer_free(argp, kfree, *acl);
296
297 (*acl)->naces = nace;
298 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
299 READ_BUF(16); len += 16;
300 READ32(ace->type);
301 READ32(ace->flag);
302 READ32(ace->access_mask);
303 READ32(dummy32);
304 READ_BUF(dummy32);
305 len += XDR_QUADLEN(dummy32) << 2;
306 READMEM(buf, dummy32);
307 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
308 host_err = 0;
309 if (ace->whotype != NFS4_ACL_WHO_NAMED)
310 ace->who = 0;
311 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
312 host_err = nfsd_map_name_to_gid(argp->rqstp,
313 buf, dummy32, &ace->who);
314 else
315 host_err = nfsd_map_name_to_uid(argp->rqstp,
316 buf, dummy32, &ace->who);
317 if (host_err)
318 goto out_nfserr;
319 }
320 } else
321 *acl = NULL;
322 if (bmval[1] & FATTR4_WORD1_MODE) {
323 READ_BUF(4);
324 len += 4;
325 READ32(iattr->ia_mode);
326 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
327 iattr->ia_valid |= ATTR_MODE;
328 }
329 if (bmval[1] & FATTR4_WORD1_OWNER) {
330 READ_BUF(4);
331 len += 4;
332 READ32(dummy32);
333 READ_BUF(dummy32);
334 len += (XDR_QUADLEN(dummy32) << 2);
335 READMEM(buf, dummy32);
336 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
337 goto out_nfserr;
338 iattr->ia_valid |= ATTR_UID;
339 }
340 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
341 READ_BUF(4);
342 len += 4;
343 READ32(dummy32);
344 READ_BUF(dummy32);
345 len += (XDR_QUADLEN(dummy32) << 2);
346 READMEM(buf, dummy32);
347 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
348 goto out_nfserr;
349 iattr->ia_valid |= ATTR_GID;
350 }
351 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
352 READ_BUF(4);
353 len += 4;
354 READ32(dummy32);
355 switch (dummy32) {
356 case NFS4_SET_TO_CLIENT_TIME:
357 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
358 all 32 bits of 'nseconds'. */
359 READ_BUF(12);
360 len += 12;
361 READ32(dummy32);
362 if (dummy32)
363 return nfserr_inval;
364 READ32(iattr->ia_atime.tv_sec);
365 READ32(iattr->ia_atime.tv_nsec);
366 if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
367 return nfserr_inval;
368 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
369 break;
370 case NFS4_SET_TO_SERVER_TIME:
371 iattr->ia_valid |= ATTR_ATIME;
372 break;
373 default:
374 goto xdr_error;
375 }
376 }
377 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
378 READ_BUF(4);
379 len += 4;
380 READ32(dummy32);
381 switch (dummy32) {
382 case NFS4_SET_TO_CLIENT_TIME:
383 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
384 all 32 bits of 'nseconds'. */
385 READ_BUF(12);
386 len += 12;
387 READ32(dummy32);
388 if (dummy32)
389 return nfserr_inval;
390 READ32(iattr->ia_mtime.tv_sec);
391 READ32(iattr->ia_mtime.tv_nsec);
392 if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
393 return nfserr_inval;
394 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
395 break;
396 case NFS4_SET_TO_SERVER_TIME:
397 iattr->ia_valid |= ATTR_MTIME;
398 break;
399 default:
400 goto xdr_error;
401 }
402 }
403 if (len != expected_len)
404 goto xdr_error;
405
406 DECODE_TAIL;
407
408 out_nfserr:
409 status = nfserrno(host_err);
410 goto out;
411 }
412
413 static __be32
414 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
415 {
416 DECODE_HEAD;
417
418 READ_BUF(sizeof(stateid_t));
419 READ32(sid->si_generation);
420 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
421
422 DECODE_TAIL;
423 }
424
425 static __be32
426 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
427 {
428 DECODE_HEAD;
429
430 READ_BUF(4);
431 READ32(access->ac_req_access);
432
433 DECODE_TAIL;
434 }
435
436 static __be32
437 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
438 {
439 DECODE_HEAD;
440
441 close->cl_stateowner = NULL;
442 READ_BUF(4);
443 READ32(close->cl_seqid);
444 return nfsd4_decode_stateid(argp, &close->cl_stateid);
445
446 DECODE_TAIL;
447 }
448
449
450 static __be32
451 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
452 {
453 DECODE_HEAD;
454
455 READ_BUF(12);
456 READ64(commit->co_offset);
457 READ32(commit->co_count);
458
459 DECODE_TAIL;
460 }
461
462 static __be32
463 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
464 {
465 DECODE_HEAD;
466
467 READ_BUF(4);
468 READ32(create->cr_type);
469 switch (create->cr_type) {
470 case NF4LNK:
471 READ_BUF(4);
472 READ32(create->cr_linklen);
473 READ_BUF(create->cr_linklen);
474 SAVEMEM(create->cr_linkname, create->cr_linklen);
475 break;
476 case NF4BLK:
477 case NF4CHR:
478 READ_BUF(8);
479 READ32(create->cr_specdata1);
480 READ32(create->cr_specdata2);
481 break;
482 case NF4SOCK:
483 case NF4FIFO:
484 case NF4DIR:
485 default:
486 break;
487 }
488
489 READ_BUF(4);
490 READ32(create->cr_namelen);
491 READ_BUF(create->cr_namelen);
492 SAVEMEM(create->cr_name, create->cr_namelen);
493 if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
494 return status;
495
496 if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
497 goto out;
498
499 DECODE_TAIL;
500 }
501
502 static inline __be32
503 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
504 {
505 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
506 }
507
508 static inline __be32
509 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
510 {
511 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
512 }
513
514 static __be32
515 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
516 {
517 DECODE_HEAD;
518
519 READ_BUF(4);
520 READ32(link->li_namelen);
521 READ_BUF(link->li_namelen);
522 SAVEMEM(link->li_name, link->li_namelen);
523 if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
524 return status;
525
526 DECODE_TAIL;
527 }
528
529 static __be32
530 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
531 {
532 DECODE_HEAD;
533
534 lock->lk_replay_owner = NULL;
535 /*
536 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
537 */
538 READ_BUF(28);
539 READ32(lock->lk_type);
540 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
541 goto xdr_error;
542 READ32(lock->lk_reclaim);
543 READ64(lock->lk_offset);
544 READ64(lock->lk_length);
545 READ32(lock->lk_is_new);
546
547 if (lock->lk_is_new) {
548 READ_BUF(4);
549 READ32(lock->lk_new_open_seqid);
550 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
551 if (status)
552 return status;
553 READ_BUF(8 + sizeof(clientid_t));
554 READ32(lock->lk_new_lock_seqid);
555 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
556 READ32(lock->lk_new_owner.len);
557 READ_BUF(lock->lk_new_owner.len);
558 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
559 } else {
560 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
561 if (status)
562 return status;
563 READ_BUF(4);
564 READ32(lock->lk_old_lock_seqid);
565 }
566
567 DECODE_TAIL;
568 }
569
570 static __be32
571 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
572 {
573 DECODE_HEAD;
574
575 READ_BUF(32);
576 READ32(lockt->lt_type);
577 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
578 goto xdr_error;
579 READ64(lockt->lt_offset);
580 READ64(lockt->lt_length);
581 COPYMEM(&lockt->lt_clientid, 8);
582 READ32(lockt->lt_owner.len);
583 READ_BUF(lockt->lt_owner.len);
584 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
585
586 DECODE_TAIL;
587 }
588
589 static __be32
590 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
591 {
592 DECODE_HEAD;
593
594 locku->lu_stateowner = NULL;
595 READ_BUF(8);
596 READ32(locku->lu_type);
597 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
598 goto xdr_error;
599 READ32(locku->lu_seqid);
600 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
601 if (status)
602 return status;
603 READ_BUF(16);
604 READ64(locku->lu_offset);
605 READ64(locku->lu_length);
606
607 DECODE_TAIL;
608 }
609
610 static __be32
611 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
612 {
613 DECODE_HEAD;
614
615 READ_BUF(4);
616 READ32(lookup->lo_len);
617 READ_BUF(lookup->lo_len);
618 SAVEMEM(lookup->lo_name, lookup->lo_len);
619 if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
620 return status;
621
622 DECODE_TAIL;
623 }
624
625 static __be32
626 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
627 {
628 DECODE_HEAD;
629
630 memset(open->op_bmval, 0, sizeof(open->op_bmval));
631 open->op_iattr.ia_valid = 0;
632 open->op_stateowner = NULL;
633
634 /* seqid, share_access, share_deny, clientid, ownerlen */
635 READ_BUF(16 + sizeof(clientid_t));
636 READ32(open->op_seqid);
637 READ32(open->op_share_access);
638 READ32(open->op_share_deny);
639 COPYMEM(&open->op_clientid, sizeof(clientid_t));
640 READ32(open->op_owner.len);
641
642 /* owner, open_flag */
643 READ_BUF(open->op_owner.len + 4);
644 SAVEMEM(open->op_owner.data, open->op_owner.len);
645 READ32(open->op_create);
646 switch (open->op_create) {
647 case NFS4_OPEN_NOCREATE:
648 break;
649 case NFS4_OPEN_CREATE:
650 READ_BUF(4);
651 READ32(open->op_createmode);
652 switch (open->op_createmode) {
653 case NFS4_CREATE_UNCHECKED:
654 case NFS4_CREATE_GUARDED:
655 if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
656 goto out;
657 break;
658 case NFS4_CREATE_EXCLUSIVE:
659 READ_BUF(8);
660 COPYMEM(open->op_verf.data, 8);
661 break;
662 default:
663 goto xdr_error;
664 }
665 break;
666 default:
667 goto xdr_error;
668 }
669
670 /* open_claim */
671 READ_BUF(4);
672 READ32(open->op_claim_type);
673 switch (open->op_claim_type) {
674 case NFS4_OPEN_CLAIM_NULL:
675 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
676 READ_BUF(4);
677 READ32(open->op_fname.len);
678 READ_BUF(open->op_fname.len);
679 SAVEMEM(open->op_fname.data, open->op_fname.len);
680 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
681 return status;
682 break;
683 case NFS4_OPEN_CLAIM_PREVIOUS:
684 READ_BUF(4);
685 READ32(open->op_delegate_type);
686 break;
687 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
688 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
689 if (status)
690 return status;
691 READ_BUF(4);
692 READ32(open->op_fname.len);
693 READ_BUF(open->op_fname.len);
694 SAVEMEM(open->op_fname.data, open->op_fname.len);
695 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
696 return status;
697 break;
698 default:
699 goto xdr_error;
700 }
701
702 DECODE_TAIL;
703 }
704
705 static __be32
706 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
707 {
708 DECODE_HEAD;
709
710 open_conf->oc_stateowner = NULL;
711 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
712 if (status)
713 return status;
714 READ_BUF(4);
715 READ32(open_conf->oc_seqid);
716
717 DECODE_TAIL;
718 }
719
720 static __be32
721 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
722 {
723 DECODE_HEAD;
724
725 open_down->od_stateowner = NULL;
726 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
727 if (status)
728 return status;
729 READ_BUF(12);
730 READ32(open_down->od_seqid);
731 READ32(open_down->od_share_access);
732 READ32(open_down->od_share_deny);
733
734 DECODE_TAIL;
735 }
736
737 static __be32
738 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
739 {
740 DECODE_HEAD;
741
742 READ_BUF(4);
743 READ32(putfh->pf_fhlen);
744 if (putfh->pf_fhlen > NFS4_FHSIZE)
745 goto xdr_error;
746 READ_BUF(putfh->pf_fhlen);
747 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
748
749 DECODE_TAIL;
750 }
751
752 static __be32
753 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
754 {
755 DECODE_HEAD;
756
757 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
758 if (status)
759 return status;
760 READ_BUF(12);
761 READ64(read->rd_offset);
762 READ32(read->rd_length);
763
764 DECODE_TAIL;
765 }
766
767 static __be32
768 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
769 {
770 DECODE_HEAD;
771
772 READ_BUF(24);
773 READ64(readdir->rd_cookie);
774 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
775 READ32(readdir->rd_dircount); /* just in case you needed a useless field... */
776 READ32(readdir->rd_maxcount);
777 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
778 goto out;
779
780 DECODE_TAIL;
781 }
782
783 static __be32
784 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
785 {
786 DECODE_HEAD;
787
788 READ_BUF(4);
789 READ32(remove->rm_namelen);
790 READ_BUF(remove->rm_namelen);
791 SAVEMEM(remove->rm_name, remove->rm_namelen);
792 if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
793 return status;
794
795 DECODE_TAIL;
796 }
797
798 static __be32
799 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
800 {
801 DECODE_HEAD;
802
803 READ_BUF(4);
804 READ32(rename->rn_snamelen);
805 READ_BUF(rename->rn_snamelen + 4);
806 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
807 READ32(rename->rn_tnamelen);
808 READ_BUF(rename->rn_tnamelen);
809 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
810 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
811 return status;
812 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
813 return status;
814
815 DECODE_TAIL;
816 }
817
818 static __be32
819 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
820 {
821 DECODE_HEAD;
822
823 READ_BUF(sizeof(clientid_t));
824 COPYMEM(clientid, sizeof(clientid_t));
825
826 DECODE_TAIL;
827 }
828
829 static __be32
830 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
831 struct nfsd4_secinfo *secinfo)
832 {
833 DECODE_HEAD;
834
835 READ_BUF(4);
836 READ32(secinfo->si_namelen);
837 READ_BUF(secinfo->si_namelen);
838 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
839 status = check_filename(secinfo->si_name, secinfo->si_namelen,
840 nfserr_noent);
841 if (status)
842 return status;
843 DECODE_TAIL;
844 }
845
846 static __be32
847 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
848 {
849 __be32 status;
850
851 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
852 if (status)
853 return status;
854 return nfsd4_decode_fattr(argp, setattr->sa_bmval,
855 &setattr->sa_iattr, &setattr->sa_acl);
856 }
857
858 static __be32
859 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
860 {
861 DECODE_HEAD;
862
863 READ_BUF(12);
864 COPYMEM(setclientid->se_verf.data, 8);
865 READ32(setclientid->se_namelen);
866
867 READ_BUF(setclientid->se_namelen + 8);
868 SAVEMEM(setclientid->se_name, setclientid->se_namelen);
869 READ32(setclientid->se_callback_prog);
870 READ32(setclientid->se_callback_netid_len);
871
872 READ_BUF(setclientid->se_callback_netid_len + 4);
873 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
874 READ32(setclientid->se_callback_addr_len);
875
876 READ_BUF(setclientid->se_callback_addr_len + 4);
877 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
878 READ32(setclientid->se_callback_ident);
879
880 DECODE_TAIL;
881 }
882
883 static __be32
884 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
885 {
886 DECODE_HEAD;
887
888 READ_BUF(8 + sizeof(nfs4_verifier));
889 COPYMEM(&scd_c->sc_clientid, 8);
890 COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
891
892 DECODE_TAIL;
893 }
894
895 /* Also used for NVERIFY */
896 static __be32
897 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
898 {
899 #if 0
900 struct nfsd4_compoundargs save = {
901 .p = argp->p,
902 .end = argp->end,
903 .rqstp = argp->rqstp,
904 };
905 u32 ve_bmval[2];
906 struct iattr ve_iattr; /* request */
907 struct nfs4_acl *ve_acl; /* request */
908 #endif
909 DECODE_HEAD;
910
911 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
912 goto out;
913
914 /* For convenience's sake, we compare raw xdr'd attributes in
915 * nfsd4_proc_verify; however we still decode here just to return
916 * correct error in case of bad xdr. */
917 #if 0
918 status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
919 if (status == nfserr_inval) {
920 status = nfserrno(status);
921 goto out;
922 }
923 #endif
924 READ_BUF(4);
925 READ32(verify->ve_attrlen);
926 READ_BUF(verify->ve_attrlen);
927 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
928
929 DECODE_TAIL;
930 }
931
932 static __be32
933 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
934 {
935 int avail;
936 int v;
937 int len;
938 DECODE_HEAD;
939
940 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
941 if (status)
942 return status;
943 READ_BUF(16);
944 READ64(write->wr_offset);
945 READ32(write->wr_stable_how);
946 if (write->wr_stable_how > 2)
947 goto xdr_error;
948 READ32(write->wr_buflen);
949
950 /* Sorry .. no magic macros for this.. *
951 * READ_BUF(write->wr_buflen);
952 * SAVEMEM(write->wr_buf, write->wr_buflen);
953 */
954 avail = (char*)argp->end - (char*)argp->p;
955 if (avail + argp->pagelen < write->wr_buflen) {
956 dprintk("NFSD: xdr error (%s:%d)\n",
957 __FILE__, __LINE__);
958 goto xdr_error;
959 }
960 argp->rqstp->rq_vec[0].iov_base = p;
961 argp->rqstp->rq_vec[0].iov_len = avail;
962 v = 0;
963 len = write->wr_buflen;
964 while (len > argp->rqstp->rq_vec[v].iov_len) {
965 len -= argp->rqstp->rq_vec[v].iov_len;
966 v++;
967 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
968 argp->pagelist++;
969 if (argp->pagelen >= PAGE_SIZE) {
970 argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
971 argp->pagelen -= PAGE_SIZE;
972 } else {
973 argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
974 argp->pagelen -= len;
975 }
976 }
977 argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
978 argp->p = (__be32*) (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
979 argp->rqstp->rq_vec[v].iov_len = len;
980 write->wr_vlen = v+1;
981
982 DECODE_TAIL;
983 }
984
985 static __be32
986 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
987 {
988 DECODE_HEAD;
989
990 READ_BUF(12);
991 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
992 READ32(rlockowner->rl_owner.len);
993 READ_BUF(rlockowner->rl_owner.len);
994 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
995
996 DECODE_TAIL;
997 }
998
999 static __be32
1000 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1001 {
1002 return nfs_ok;
1003 }
1004
1005 static __be32
1006 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1007 {
1008 return nfserr_opnotsupp;
1009 }
1010
1011 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1012
1013 static nfsd4_dec nfsd4_dec_ops[] = {
1014 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1015 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1016 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1017 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1018 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1019 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1020 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1021 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1022 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1023 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1024 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1025 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1026 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1027 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1028 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1029 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1030 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1031 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1032 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1033 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1034 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_notsupp,
1035 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1036 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1037 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1038 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1039 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1040 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1041 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1042 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1043 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1044 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1045 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1046 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1047 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1048 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1049 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1050 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1051 };
1052
1053 struct nfsd4_minorversion_ops {
1054 nfsd4_dec *decoders;
1055 int nops;
1056 };
1057
1058 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1059 [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1060 };
1061
1062 static __be32
1063 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1064 {
1065 DECODE_HEAD;
1066 struct nfsd4_op *op;
1067 struct nfsd4_minorversion_ops *ops;
1068 int i;
1069
1070 /*
1071 * XXX: According to spec, we should check the tag
1072 * for UTF-8 compliance. I'm postponing this for
1073 * now because it seems that some clients do use
1074 * binary tags.
1075 */
1076 READ_BUF(4);
1077 READ32(argp->taglen);
1078 READ_BUF(argp->taglen + 8);
1079 SAVEMEM(argp->tag, argp->taglen);
1080 READ32(argp->minorversion);
1081 READ32(argp->opcnt);
1082
1083 if (argp->taglen > NFSD4_MAX_TAGLEN)
1084 goto xdr_error;
1085 if (argp->opcnt > 100)
1086 goto xdr_error;
1087
1088 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1089 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1090 if (!argp->ops) {
1091 argp->ops = argp->iops;
1092 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1093 goto xdr_error;
1094 }
1095 }
1096
1097 if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1098 argp->opcnt = 0;
1099
1100 ops = &nfsd4_minorversion[argp->minorversion];
1101 for (i = 0; i < argp->opcnt; i++) {
1102 op = &argp->ops[i];
1103 op->replay = NULL;
1104
1105 /*
1106 * We can't use READ_BUF() here because we need to handle
1107 * a missing opcode as an OP_WRITE + 1. So we need to check
1108 * to see if we're truly at the end of our buffer or if there
1109 * is another page we need to flip to.
1110 */
1111
1112 if (argp->p == argp->end) {
1113 if (argp->pagelen < 4) {
1114 /* There isn't an opcode still on the wire */
1115 op->opnum = OP_WRITE + 1;
1116 op->status = nfserr_bad_xdr;
1117 argp->opcnt = i+1;
1118 break;
1119 }
1120
1121 /*
1122 * False alarm. We just hit a page boundary, but there
1123 * is still data available. Move pointer across page
1124 * boundary. *snip from READ_BUF*
1125 */
1126 argp->p = page_address(argp->pagelist[0]);
1127 argp->pagelist++;
1128 if (argp->pagelen < PAGE_SIZE) {
1129 argp->end = p + (argp->pagelen>>2);
1130 argp->pagelen = 0;
1131 } else {
1132 argp->end = p + (PAGE_SIZE>>2);
1133 argp->pagelen -= PAGE_SIZE;
1134 }
1135 }
1136 op->opnum = ntohl(*argp->p++);
1137
1138 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1139 op->status = ops->decoders[op->opnum](argp, &op->u);
1140 else {
1141 op->opnum = OP_ILLEGAL;
1142 op->status = nfserr_op_illegal;
1143 }
1144
1145 if (op->status) {
1146 argp->opcnt = i+1;
1147 break;
1148 }
1149 }
1150
1151 DECODE_TAIL;
1152 }
1153 /*
1154 * END OF "GENERIC" DECODE ROUTINES.
1155 */
1156
1157 /*
1158 * START OF "GENERIC" ENCODE ROUTINES.
1159 * These may look a little ugly since they are imported from a "generic"
1160 * set of XDR encode/decode routines which are intended to be shared by
1161 * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1162 *
1163 * If the pain of reading these is too great, it should be a straightforward
1164 * task to translate them into Linux-specific versions which are more
1165 * consistent with the style used in NFSv2/v3...
1166 */
1167 #define ENCODE_HEAD __be32 *p
1168
1169 #define WRITE32(n) *p++ = htonl(n)
1170 #define WRITE64(n) do { \
1171 *p++ = htonl((u32)((n) >> 32)); \
1172 *p++ = htonl((u32)(n)); \
1173 } while (0)
1174 #define WRITEMEM(ptr,nbytes) do { if (nbytes > 0) { \
1175 *(p + XDR_QUADLEN(nbytes) -1) = 0; \
1176 memcpy(p, ptr, nbytes); \
1177 p += XDR_QUADLEN(nbytes); \
1178 }} while (0)
1179 #define WRITECINFO(c) do { \
1180 *p++ = htonl(c.atomic); \
1181 *p++ = htonl(c.before_ctime_sec); \
1182 *p++ = htonl(c.before_ctime_nsec); \
1183 *p++ = htonl(c.after_ctime_sec); \
1184 *p++ = htonl(c.after_ctime_nsec); \
1185 } while (0)
1186
1187 #define RESERVE_SPACE(nbytes) do { \
1188 p = resp->p; \
1189 BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end); \
1190 } while (0)
1191 #define ADJUST_ARGS() resp->p = p
1192
1193 /*
1194 * Header routine to setup seqid operation replay cache
1195 */
1196 #define ENCODE_SEQID_OP_HEAD \
1197 __be32 *save; \
1198 \
1199 save = resp->p;
1200
1201 /*
1202 * Routine for encoding the result of a "seqid-mutating" NFSv4 operation. This
1203 * is where sequence id's are incremented, and the replay cache is filled.
1204 * Note that we increment sequence id's here, at the last moment, so we're sure
1205 * we know whether the error to be returned is a sequence id mutating error.
1206 */
1207
1208 #define ENCODE_SEQID_OP_TAIL(stateowner) do { \
1209 if (seqid_mutating_err(nfserr) && stateowner) { \
1210 stateowner->so_seqid++; \
1211 stateowner->so_replay.rp_status = nfserr; \
1212 stateowner->so_replay.rp_buflen = \
1213 (((char *)(resp)->p - (char *)save)); \
1214 memcpy(stateowner->so_replay.rp_buf, save, \
1215 stateowner->so_replay.rp_buflen); \
1216 } } while (0);
1217
1218 /* Encode as an array of strings the string given with components
1219 * seperated @sep.
1220 */
1221 static __be32 nfsd4_encode_components(char sep, char *components,
1222 __be32 **pp, int *buflen)
1223 {
1224 __be32 *p = *pp;
1225 __be32 *countp = p;
1226 int strlen, count=0;
1227 char *str, *end;
1228
1229 dprintk("nfsd4_encode_components(%s)\n", components);
1230 if ((*buflen -= 4) < 0)
1231 return nfserr_resource;
1232 WRITE32(0); /* We will fill this in with @count later */
1233 end = str = components;
1234 while (*end) {
1235 for (; *end && (*end != sep); end++)
1236 ; /* Point to end of component */
1237 strlen = end - str;
1238 if (strlen) {
1239 if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1240 return nfserr_resource;
1241 WRITE32(strlen);
1242 WRITEMEM(str, strlen);
1243 count++;
1244 }
1245 else
1246 end++;
1247 str = end;
1248 }
1249 *pp = p;
1250 p = countp;
1251 WRITE32(count);
1252 return 0;
1253 }
1254
1255 /*
1256 * encode a location element of a fs_locations structure
1257 */
1258 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1259 __be32 **pp, int *buflen)
1260 {
1261 __be32 status;
1262 __be32 *p = *pp;
1263
1264 status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1265 if (status)
1266 return status;
1267 status = nfsd4_encode_components('/', location->path, &p, buflen);
1268 if (status)
1269 return status;
1270 *pp = p;
1271 return 0;
1272 }
1273
1274 /*
1275 * Return the path to an export point in the pseudo filesystem namespace
1276 * Returned string is safe to use as long as the caller holds a reference
1277 * to @exp.
1278 */
1279 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1280 {
1281 struct svc_fh tmp_fh;
1282 char *path, *rootpath;
1283
1284 fh_init(&tmp_fh, NFS4_FHSIZE);
1285 *stat = exp_pseudoroot(rqstp, &tmp_fh);
1286 if (*stat)
1287 return NULL;
1288 rootpath = tmp_fh.fh_export->ex_pathname;
1289
1290 path = exp->ex_pathname;
1291
1292 if (strncmp(path, rootpath, strlen(rootpath))) {
1293 dprintk("nfsd: fs_locations failed;"
1294 "%s is not contained in %s\n", path, rootpath);
1295 *stat = nfserr_notsupp;
1296 return NULL;
1297 }
1298
1299 return path + strlen(rootpath);
1300 }
1301
1302 /*
1303 * encode a fs_locations structure
1304 */
1305 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1306 struct svc_export *exp,
1307 __be32 **pp, int *buflen)
1308 {
1309 __be32 status;
1310 int i;
1311 __be32 *p = *pp;
1312 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1313 char *root = nfsd4_path(rqstp, exp, &status);
1314
1315 if (status)
1316 return status;
1317 status = nfsd4_encode_components('/', root, &p, buflen);
1318 if (status)
1319 return status;
1320 if ((*buflen -= 4) < 0)
1321 return nfserr_resource;
1322 WRITE32(fslocs->locations_count);
1323 for (i=0; i<fslocs->locations_count; i++) {
1324 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1325 &p, buflen);
1326 if (status)
1327 return status;
1328 }
1329 *pp = p;
1330 return 0;
1331 }
1332
1333 static u32 nfs4_ftypes[16] = {
1334 NF4BAD, NF4FIFO, NF4CHR, NF4BAD,
1335 NF4DIR, NF4BAD, NF4BLK, NF4BAD,
1336 NF4REG, NF4BAD, NF4LNK, NF4BAD,
1337 NF4SOCK, NF4BAD, NF4LNK, NF4BAD,
1338 };
1339
1340 static __be32
1341 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1342 __be32 **p, int *buflen)
1343 {
1344 int status;
1345
1346 if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1347 return nfserr_resource;
1348 if (whotype != NFS4_ACL_WHO_NAMED)
1349 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1350 else if (group)
1351 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1352 else
1353 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1354 if (status < 0)
1355 return nfserrno(status);
1356 *p = xdr_encode_opaque(*p, NULL, status);
1357 *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1358 BUG_ON(*buflen < 0);
1359 return 0;
1360 }
1361
1362 static inline __be32
1363 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1364 {
1365 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1366 }
1367
1368 static inline __be32
1369 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1370 {
1371 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1372 }
1373
1374 static inline __be32
1375 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1376 __be32 **p, int *buflen)
1377 {
1378 return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1379 }
1380
1381 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1382 FATTR4_WORD0_RDATTR_ERROR)
1383 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1384
1385 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1386 {
1387 /* As per referral draft: */
1388 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1389 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1390 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1391 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1392 *rdattr_err = NFSERR_MOVED;
1393 else
1394 return nfserr_moved;
1395 }
1396 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1397 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1398 return 0;
1399 }
1400
1401 /*
1402 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1403 * ourselves.
1404 *
1405 * @countp is the buffer size in _words_; upon successful return this becomes
1406 * replaced with the number of words written.
1407 */
1408 __be32
1409 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1410 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1411 struct svc_rqst *rqstp, int ignore_crossmnt)
1412 {
1413 u32 bmval0 = bmval[0];
1414 u32 bmval1 = bmval[1];
1415 struct kstat stat;
1416 struct svc_fh tempfh;
1417 struct kstatfs statfs;
1418 int buflen = *countp << 2;
1419 __be32 *attrlenp;
1420 u32 dummy;
1421 u64 dummy64;
1422 u32 rdattr_err = 0;
1423 __be32 *p = buffer;
1424 __be32 status;
1425 int err;
1426 int aclsupport = 0;
1427 struct nfs4_acl *acl = NULL;
1428
1429 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1430 BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1431 BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1432
1433 if (exp->ex_fslocs.migrated) {
1434 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1435 if (status)
1436 goto out;
1437 }
1438
1439 err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1440 if (err)
1441 goto out_nfserr;
1442 if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1443 FATTR4_WORD0_MAXNAME)) ||
1444 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1445 FATTR4_WORD1_SPACE_TOTAL))) {
1446 err = vfs_statfs(dentry, &statfs);
1447 if (err)
1448 goto out_nfserr;
1449 }
1450 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1451 fh_init(&tempfh, NFS4_FHSIZE);
1452 status = fh_compose(&tempfh, exp, dentry, NULL);
1453 if (status)
1454 goto out;
1455 fhp = &tempfh;
1456 }
1457 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1458 | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1459 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1460 aclsupport = (err == 0);
1461 if (bmval0 & FATTR4_WORD0_ACL) {
1462 if (err == -EOPNOTSUPP)
1463 bmval0 &= ~FATTR4_WORD0_ACL;
1464 else if (err == -EINVAL) {
1465 status = nfserr_attrnotsupp;
1466 goto out;
1467 } else if (err != 0)
1468 goto out_nfserr;
1469 }
1470 }
1471 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1472 if (exp->ex_fslocs.locations == NULL) {
1473 bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1474 }
1475 }
1476 if ((buflen -= 16) < 0)
1477 goto out_resource;
1478
1479 WRITE32(2);
1480 WRITE32(bmval0);
1481 WRITE32(bmval1);
1482 attrlenp = p++; /* to be backfilled later */
1483
1484 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1485 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1486 if ((buflen -= 12) < 0)
1487 goto out_resource;
1488 if (!aclsupport)
1489 word0 &= ~FATTR4_WORD0_ACL;
1490 if (!exp->ex_fslocs.locations)
1491 word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1492 WRITE32(2);
1493 WRITE32(word0);
1494 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1495 }
1496 if (bmval0 & FATTR4_WORD0_TYPE) {
1497 if ((buflen -= 4) < 0)
1498 goto out_resource;
1499 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1500 if (dummy == NF4BAD)
1501 goto out_serverfault;
1502 WRITE32(dummy);
1503 }
1504 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1505 if ((buflen -= 4) < 0)
1506 goto out_resource;
1507 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1508 WRITE32(NFS4_FH_PERSISTENT);
1509 else
1510 WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1511 }
1512 if (bmval0 & FATTR4_WORD0_CHANGE) {
1513 /*
1514 * Note: This _must_ be consistent with the scheme for writing
1515 * change_info, so any changes made here must be reflected there
1516 * as well. (See xdr4.h:set_change_info() and the WRITECINFO()
1517 * macro above.)
1518 */
1519 if ((buflen -= 8) < 0)
1520 goto out_resource;
1521 WRITE32(stat.ctime.tv_sec);
1522 WRITE32(stat.ctime.tv_nsec);
1523 }
1524 if (bmval0 & FATTR4_WORD0_SIZE) {
1525 if ((buflen -= 8) < 0)
1526 goto out_resource;
1527 WRITE64(stat.size);
1528 }
1529 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1530 if ((buflen -= 4) < 0)
1531 goto out_resource;
1532 WRITE32(1);
1533 }
1534 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1535 if ((buflen -= 4) < 0)
1536 goto out_resource;
1537 WRITE32(1);
1538 }
1539 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1540 if ((buflen -= 4) < 0)
1541 goto out_resource;
1542 WRITE32(0);
1543 }
1544 if (bmval0 & FATTR4_WORD0_FSID) {
1545 if ((buflen -= 16) < 0)
1546 goto out_resource;
1547 if (exp->ex_fslocs.migrated) {
1548 WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1549 WRITE64(NFS4_REFERRAL_FSID_MINOR);
1550 } else switch(fsid_source(fhp)) {
1551 case FSIDSOURCE_FSID:
1552 WRITE64((u64)exp->ex_fsid);
1553 WRITE64((u64)0);
1554 break;
1555 case FSIDSOURCE_DEV:
1556 WRITE32(0);
1557 WRITE32(MAJOR(stat.dev));
1558 WRITE32(0);
1559 WRITE32(MINOR(stat.dev));
1560 break;
1561 case FSIDSOURCE_UUID:
1562 WRITEMEM(exp->ex_uuid, 16);
1563 break;
1564 }
1565 }
1566 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1567 if ((buflen -= 4) < 0)
1568 goto out_resource;
1569 WRITE32(0);
1570 }
1571 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1572 if ((buflen -= 4) < 0)
1573 goto out_resource;
1574 WRITE32(NFSD_LEASE_TIME);
1575 }
1576 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1577 if ((buflen -= 4) < 0)
1578 goto out_resource;
1579 WRITE32(rdattr_err);
1580 }
1581 if (bmval0 & FATTR4_WORD0_ACL) {
1582 struct nfs4_ace *ace;
1583
1584 if (acl == NULL) {
1585 if ((buflen -= 4) < 0)
1586 goto out_resource;
1587
1588 WRITE32(0);
1589 goto out_acl;
1590 }
1591 if ((buflen -= 4) < 0)
1592 goto out_resource;
1593 WRITE32(acl->naces);
1594
1595 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1596 if ((buflen -= 4*3) < 0)
1597 goto out_resource;
1598 WRITE32(ace->type);
1599 WRITE32(ace->flag);
1600 WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1601 status = nfsd4_encode_aclname(rqstp, ace->whotype,
1602 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1603 &p, &buflen);
1604 if (status == nfserr_resource)
1605 goto out_resource;
1606 if (status)
1607 goto out;
1608 }
1609 }
1610 out_acl:
1611 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1612 if ((buflen -= 4) < 0)
1613 goto out_resource;
1614 WRITE32(aclsupport ?
1615 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1616 }
1617 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1618 if ((buflen -= 4) < 0)
1619 goto out_resource;
1620 WRITE32(1);
1621 }
1622 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1623 if ((buflen -= 4) < 0)
1624 goto out_resource;
1625 WRITE32(1);
1626 }
1627 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1628 if ((buflen -= 4) < 0)
1629 goto out_resource;
1630 WRITE32(1);
1631 }
1632 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1633 if ((buflen -= 4) < 0)
1634 goto out_resource;
1635 WRITE32(1);
1636 }
1637 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1638 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1639 if (buflen < 0)
1640 goto out_resource;
1641 WRITE32(fhp->fh_handle.fh_size);
1642 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1643 }
1644 if (bmval0 & FATTR4_WORD0_FILEID) {
1645 if ((buflen -= 8) < 0)
1646 goto out_resource;
1647 WRITE64(stat.ino);
1648 }
1649 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1650 if ((buflen -= 8) < 0)
1651 goto out_resource;
1652 WRITE64((u64) statfs.f_ffree);
1653 }
1654 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1655 if ((buflen -= 8) < 0)
1656 goto out_resource;
1657 WRITE64((u64) statfs.f_ffree);
1658 }
1659 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1660 if ((buflen -= 8) < 0)
1661 goto out_resource;
1662 WRITE64((u64) statfs.f_files);
1663 }
1664 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1665 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1666 if (status == nfserr_resource)
1667 goto out_resource;
1668 if (status)
1669 goto out;
1670 }
1671 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1672 if ((buflen -= 4) < 0)
1673 goto out_resource;
1674 WRITE32(1);
1675 }
1676 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1677 if ((buflen -= 8) < 0)
1678 goto out_resource;
1679 WRITE64(~(u64)0);
1680 }
1681 if (bmval0 & FATTR4_WORD0_MAXLINK) {
1682 if ((buflen -= 4) < 0)
1683 goto out_resource;
1684 WRITE32(255);
1685 }
1686 if (bmval0 & FATTR4_WORD0_MAXNAME) {
1687 if ((buflen -= 4) < 0)
1688 goto out_resource;
1689 WRITE32(statfs.f_namelen);
1690 }
1691 if (bmval0 & FATTR4_WORD0_MAXREAD) {
1692 if ((buflen -= 8) < 0)
1693 goto out_resource;
1694 WRITE64((u64) svc_max_payload(rqstp));
1695 }
1696 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1697 if ((buflen -= 8) < 0)
1698 goto out_resource;
1699 WRITE64((u64) svc_max_payload(rqstp));
1700 }
1701 if (bmval1 & FATTR4_WORD1_MODE) {
1702 if ((buflen -= 4) < 0)
1703 goto out_resource;
1704 WRITE32(stat.mode & S_IALLUGO);
1705 }
1706 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1707 if ((buflen -= 4) < 0)
1708 goto out_resource;
1709 WRITE32(1);
1710 }
1711 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1712 if ((buflen -= 4) < 0)
1713 goto out_resource;
1714 WRITE32(stat.nlink);
1715 }
1716 if (bmval1 & FATTR4_WORD1_OWNER) {
1717 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1718 if (status == nfserr_resource)
1719 goto out_resource;
1720 if (status)
1721 goto out;
1722 }
1723 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1724 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1725 if (status == nfserr_resource)
1726 goto out_resource;
1727 if (status)
1728 goto out;
1729 }
1730 if (bmval1 & FATTR4_WORD1_RAWDEV) {
1731 if ((buflen -= 8) < 0)
1732 goto out_resource;
1733 WRITE32((u32) MAJOR(stat.rdev));
1734 WRITE32((u32) MINOR(stat.rdev));
1735 }
1736 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1737 if ((buflen -= 8) < 0)
1738 goto out_resource;
1739 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1740 WRITE64(dummy64);
1741 }
1742 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1743 if ((buflen -= 8) < 0)
1744 goto out_resource;
1745 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1746 WRITE64(dummy64);
1747 }
1748 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1749 if ((buflen -= 8) < 0)
1750 goto out_resource;
1751 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1752 WRITE64(dummy64);
1753 }
1754 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1755 if ((buflen -= 8) < 0)
1756 goto out_resource;
1757 dummy64 = (u64)stat.blocks << 9;
1758 WRITE64(dummy64);
1759 }
1760 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1761 if ((buflen -= 12) < 0)
1762 goto out_resource;
1763 WRITE32(0);
1764 WRITE32(stat.atime.tv_sec);
1765 WRITE32(stat.atime.tv_nsec);
1766 }
1767 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1768 if ((buflen -= 12) < 0)
1769 goto out_resource;
1770 WRITE32(0);
1771 WRITE32(1);
1772 WRITE32(0);
1773 }
1774 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1775 if ((buflen -= 12) < 0)
1776 goto out_resource;
1777 WRITE32(0);
1778 WRITE32(stat.ctime.tv_sec);
1779 WRITE32(stat.ctime.tv_nsec);
1780 }
1781 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1782 if ((buflen -= 12) < 0)
1783 goto out_resource;
1784 WRITE32(0);
1785 WRITE32(stat.mtime.tv_sec);
1786 WRITE32(stat.mtime.tv_nsec);
1787 }
1788 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1789 if ((buflen -= 8) < 0)
1790 goto out_resource;
1791 /*
1792 * Get parent's attributes if not ignoring crossmount
1793 * and this is the root of a cross-mounted filesystem.
1794 */
1795 if (ignore_crossmnt == 0 &&
1796 exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
1797 err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
1798 exp->ex_path.mnt->mnt_mountpoint, &stat);
1799 if (err)
1800 goto out_nfserr;
1801 }
1802 WRITE64(stat.ino);
1803 }
1804 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1805 *countp = p - buffer;
1806 status = nfs_ok;
1807
1808 out:
1809 kfree(acl);
1810 if (fhp == &tempfh)
1811 fh_put(&tempfh);
1812 return status;
1813 out_nfserr:
1814 status = nfserrno(err);
1815 goto out;
1816 out_resource:
1817 *countp = 0;
1818 status = nfserr_resource;
1819 goto out;
1820 out_serverfault:
1821 status = nfserr_serverfault;
1822 goto out;
1823 }
1824
1825 static inline int attributes_need_mount(u32 *bmval)
1826 {
1827 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
1828 return 1;
1829 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
1830 return 1;
1831 return 0;
1832 }
1833
1834 static __be32
1835 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1836 const char *name, int namlen, __be32 *p, int *buflen)
1837 {
1838 struct svc_export *exp = cd->rd_fhp->fh_export;
1839 struct dentry *dentry;
1840 __be32 nfserr;
1841 int ignore_crossmnt = 0;
1842
1843 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1844 if (IS_ERR(dentry))
1845 return nfserrno(PTR_ERR(dentry));
1846 if (!dentry->d_inode) {
1847 /*
1848 * nfsd_buffered_readdir drops the i_mutex between
1849 * readdir and calling this callback, leaving a window
1850 * where this directory entry could have gone away.
1851 */
1852 dput(dentry);
1853 return nfserr_noent;
1854 }
1855
1856 exp_get(exp);
1857 /*
1858 * In the case of a mountpoint, the client may be asking for
1859 * attributes that are only properties of the underlying filesystem
1860 * as opposed to the cross-mounted file system. In such a case,
1861 * we will not follow the cross mount and will fill the attribtutes
1862 * directly from the mountpoint dentry.
1863 */
1864 if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
1865 ignore_crossmnt = 1;
1866 else if (d_mountpoint(dentry)) {
1867 int err;
1868
1869 /*
1870 * Why the heck aren't we just using nfsd_lookup??
1871 * Different "."/".." handling? Something else?
1872 * At least, add a comment here to explain....
1873 */
1874 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1875 if (err) {
1876 nfserr = nfserrno(err);
1877 goto out_put;
1878 }
1879 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
1880 if (nfserr)
1881 goto out_put;
1882
1883 }
1884 nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1885 cd->rd_rqstp, ignore_crossmnt);
1886 out_put:
1887 dput(dentry);
1888 exp_put(exp);
1889 return nfserr;
1890 }
1891
1892 static __be32 *
1893 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1894 {
1895 __be32 *attrlenp;
1896
1897 if (buflen < 6)
1898 return NULL;
1899 *p++ = htonl(2);
1900 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1901 *p++ = htonl(0); /* bmval1 */
1902
1903 attrlenp = p++;
1904 *p++ = nfserr; /* no htonl */
1905 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1906 return p;
1907 }
1908
1909 static int
1910 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1911 loff_t offset, u64 ino, unsigned int d_type)
1912 {
1913 struct readdir_cd *ccd = ccdv;
1914 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1915 int buflen;
1916 __be32 *p = cd->buffer;
1917 __be32 *cookiep;
1918 __be32 nfserr = nfserr_toosmall;
1919
1920 /* In nfsv4, "." and ".." never make it onto the wire.. */
1921 if (name && isdotent(name, namlen)) {
1922 cd->common.err = nfs_ok;
1923 return 0;
1924 }
1925
1926 if (cd->offset)
1927 xdr_encode_hyper(cd->offset, (u64) offset);
1928
1929 buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1930 if (buflen < 0)
1931 goto fail;
1932
1933 *p++ = xdr_one; /* mark entry present */
1934 cookiep = p;
1935 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
1936 p = xdr_encode_array(p, name, namlen); /* name length & name */
1937
1938 nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1939 switch (nfserr) {
1940 case nfs_ok:
1941 p += buflen;
1942 break;
1943 case nfserr_resource:
1944 nfserr = nfserr_toosmall;
1945 goto fail;
1946 case nfserr_dropit:
1947 goto fail;
1948 case nfserr_noent:
1949 goto skip_entry;
1950 default:
1951 /*
1952 * If the client requested the RDATTR_ERROR attribute,
1953 * we stuff the error code into this attribute
1954 * and continue. If this attribute was not requested,
1955 * then in accordance with the spec, we fail the
1956 * entire READDIR operation(!)
1957 */
1958 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1959 goto fail;
1960 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1961 if (p == NULL) {
1962 nfserr = nfserr_toosmall;
1963 goto fail;
1964 }
1965 }
1966 cd->buflen -= (p - cd->buffer);
1967 cd->buffer = p;
1968 cd->offset = cookiep;
1969 skip_entry:
1970 cd->common.err = nfs_ok;
1971 return 0;
1972 fail:
1973 cd->common.err = nfserr;
1974 return -EINVAL;
1975 }
1976
1977 static void
1978 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
1979 {
1980 ENCODE_HEAD;
1981
1982 RESERVE_SPACE(sizeof(stateid_t));
1983 WRITE32(sid->si_generation);
1984 WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
1985 ADJUST_ARGS();
1986 }
1987
1988 static __be32
1989 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1990 {
1991 ENCODE_HEAD;
1992
1993 if (!nfserr) {
1994 RESERVE_SPACE(8);
1995 WRITE32(access->ac_supported);
1996 WRITE32(access->ac_resp_access);
1997 ADJUST_ARGS();
1998 }
1999 return nfserr;
2000 }
2001
2002 static __be32
2003 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2004 {
2005 ENCODE_SEQID_OP_HEAD;
2006
2007 if (!nfserr)
2008 nfsd4_encode_stateid(resp, &close->cl_stateid);
2009
2010 ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2011 return nfserr;
2012 }
2013
2014
2015 static __be32
2016 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2017 {
2018 ENCODE_HEAD;
2019
2020 if (!nfserr) {
2021 RESERVE_SPACE(8);
2022 WRITEMEM(commit->co_verf.data, 8);
2023 ADJUST_ARGS();
2024 }
2025 return nfserr;
2026 }
2027
2028 static __be32
2029 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2030 {
2031 ENCODE_HEAD;
2032
2033 if (!nfserr) {
2034 RESERVE_SPACE(32);
2035 WRITECINFO(create->cr_cinfo);
2036 WRITE32(2);
2037 WRITE32(create->cr_bmval[0]);
2038 WRITE32(create->cr_bmval[1]);
2039 ADJUST_ARGS();
2040 }
2041 return nfserr;
2042 }
2043
2044 static __be32
2045 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2046 {
2047 struct svc_fh *fhp = getattr->ga_fhp;
2048 int buflen;
2049
2050 if (nfserr)
2051 return nfserr;
2052
2053 buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2054 nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2055 resp->p, &buflen, getattr->ga_bmval,
2056 resp->rqstp, 0);
2057 if (!nfserr)
2058 resp->p += buflen;
2059 return nfserr;
2060 }
2061
2062 static __be32
2063 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2064 {
2065 struct svc_fh *fhp = *fhpp;
2066 unsigned int len;
2067 ENCODE_HEAD;
2068
2069 if (!nfserr) {
2070 len = fhp->fh_handle.fh_size;
2071 RESERVE_SPACE(len + 4);
2072 WRITE32(len);
2073 WRITEMEM(&fhp->fh_handle.fh_base, len);
2074 ADJUST_ARGS();
2075 }
2076 return nfserr;
2077 }
2078
2079 /*
2080 * Including all fields other than the name, a LOCK4denied structure requires
2081 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2082 */
2083 static void
2084 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2085 {
2086 ENCODE_HEAD;
2087
2088 RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2089 WRITE64(ld->ld_start);
2090 WRITE64(ld->ld_length);
2091 WRITE32(ld->ld_type);
2092 if (ld->ld_sop) {
2093 WRITEMEM(&ld->ld_clientid, 8);
2094 WRITE32(ld->ld_sop->so_owner.len);
2095 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2096 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2097 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
2098 WRITE64((u64)0); /* clientid */
2099 WRITE32(0); /* length of owner name */
2100 }
2101 ADJUST_ARGS();
2102 }
2103
2104 static __be32
2105 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2106 {
2107 ENCODE_SEQID_OP_HEAD;
2108
2109 if (!nfserr)
2110 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2111 else if (nfserr == nfserr_denied)
2112 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2113
2114 ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2115 return nfserr;
2116 }
2117
2118 static __be32
2119 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2120 {
2121 if (nfserr == nfserr_denied)
2122 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2123 return nfserr;
2124 }
2125
2126 static __be32
2127 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2128 {
2129 ENCODE_SEQID_OP_HEAD;
2130
2131 if (!nfserr)
2132 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2133
2134 ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2135 return nfserr;
2136 }
2137
2138
2139 static __be32
2140 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2141 {
2142 ENCODE_HEAD;
2143
2144 if (!nfserr) {
2145 RESERVE_SPACE(20);
2146 WRITECINFO(link->li_cinfo);
2147 ADJUST_ARGS();
2148 }
2149 return nfserr;
2150 }
2151
2152
2153 static __be32
2154 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2155 {
2156 ENCODE_HEAD;
2157 ENCODE_SEQID_OP_HEAD;
2158
2159 if (nfserr)
2160 goto out;
2161
2162 nfsd4_encode_stateid(resp, &open->op_stateid);
2163 RESERVE_SPACE(40);
2164 WRITECINFO(open->op_cinfo);
2165 WRITE32(open->op_rflags);
2166 WRITE32(2);
2167 WRITE32(open->op_bmval[0]);
2168 WRITE32(open->op_bmval[1]);
2169 WRITE32(open->op_delegate_type);
2170 ADJUST_ARGS();
2171
2172 switch (open->op_delegate_type) {
2173 case NFS4_OPEN_DELEGATE_NONE:
2174 break;
2175 case NFS4_OPEN_DELEGATE_READ:
2176 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2177 RESERVE_SPACE(20);
2178 WRITE32(open->op_recall);
2179
2180 /*
2181 * TODO: ACE's in delegations
2182 */
2183 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2184 WRITE32(0);
2185 WRITE32(0);
2186 WRITE32(0); /* XXX: is NULL principal ok? */
2187 ADJUST_ARGS();
2188 break;
2189 case NFS4_OPEN_DELEGATE_WRITE:
2190 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2191 RESERVE_SPACE(32);
2192 WRITE32(0);
2193
2194 /*
2195 * TODO: space_limit's in delegations
2196 */
2197 WRITE32(NFS4_LIMIT_SIZE);
2198 WRITE32(~(u32)0);
2199 WRITE32(~(u32)0);
2200
2201 /*
2202 * TODO: ACE's in delegations
2203 */
2204 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2205 WRITE32(0);
2206 WRITE32(0);
2207 WRITE32(0); /* XXX: is NULL principal ok? */
2208 ADJUST_ARGS();
2209 break;
2210 default:
2211 BUG();
2212 }
2213 /* XXX save filehandle here */
2214 out:
2215 ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2216 return nfserr;
2217 }
2218
2219 static __be32
2220 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2221 {
2222 ENCODE_SEQID_OP_HEAD;
2223
2224 if (!nfserr)
2225 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2226
2227 ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2228 return nfserr;
2229 }
2230
2231 static __be32
2232 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2233 {
2234 ENCODE_SEQID_OP_HEAD;
2235
2236 if (!nfserr)
2237 nfsd4_encode_stateid(resp, &od->od_stateid);
2238
2239 ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2240 return nfserr;
2241 }
2242
2243 static __be32
2244 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2245 struct nfsd4_read *read)
2246 {
2247 u32 eof;
2248 int v, pn;
2249 unsigned long maxcount;
2250 long len;
2251 ENCODE_HEAD;
2252
2253 if (nfserr)
2254 return nfserr;
2255 if (resp->xbuf->page_len)
2256 return nfserr_resource;
2257
2258 RESERVE_SPACE(8); /* eof flag and byte count */
2259
2260 maxcount = svc_max_payload(resp->rqstp);
2261 if (maxcount > read->rd_length)
2262 maxcount = read->rd_length;
2263
2264 len = maxcount;
2265 v = 0;
2266 while (len > 0) {
2267 pn = resp->rqstp->rq_resused++;
2268 resp->rqstp->rq_vec[v].iov_base =
2269 page_address(resp->rqstp->rq_respages[pn]);
2270 resp->rqstp->rq_vec[v].iov_len =
2271 len < PAGE_SIZE ? len : PAGE_SIZE;
2272 v++;
2273 len -= PAGE_SIZE;
2274 }
2275 read->rd_vlen = v;
2276
2277 nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2278 read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2279 &maxcount);
2280
2281 if (nfserr == nfserr_symlink)
2282 nfserr = nfserr_inval;
2283 if (nfserr)
2284 return nfserr;
2285 eof = (read->rd_offset + maxcount >=
2286 read->rd_fhp->fh_dentry->d_inode->i_size);
2287
2288 WRITE32(eof);
2289 WRITE32(maxcount);
2290 ADJUST_ARGS();
2291 resp->xbuf->head[0].iov_len = (char*)p
2292 - (char*)resp->xbuf->head[0].iov_base;
2293 resp->xbuf->page_len = maxcount;
2294
2295 /* Use rest of head for padding and remaining ops: */
2296 resp->xbuf->tail[0].iov_base = p;
2297 resp->xbuf->tail[0].iov_len = 0;
2298 if (maxcount&3) {
2299 RESERVE_SPACE(4);
2300 WRITE32(0);
2301 resp->xbuf->tail[0].iov_base += maxcount&3;
2302 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2303 ADJUST_ARGS();
2304 }
2305 return 0;
2306 }
2307
2308 static __be32
2309 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2310 {
2311 int maxcount;
2312 char *page;
2313 ENCODE_HEAD;
2314
2315 if (nfserr)
2316 return nfserr;
2317 if (resp->xbuf->page_len)
2318 return nfserr_resource;
2319
2320 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2321
2322 maxcount = PAGE_SIZE;
2323 RESERVE_SPACE(4);
2324
2325 /*
2326 * XXX: By default, the ->readlink() VFS op will truncate symlinks
2327 * if they would overflow the buffer. Is this kosher in NFSv4? If
2328 * not, one easy fix is: if ->readlink() precisely fills the buffer,
2329 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2330 */
2331 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2332 if (nfserr == nfserr_isdir)
2333 return nfserr_inval;
2334 if (nfserr)
2335 return nfserr;
2336
2337 WRITE32(maxcount);
2338 ADJUST_ARGS();
2339 resp->xbuf->head[0].iov_len = (char*)p
2340 - (char*)resp->xbuf->head[0].iov_base;
2341 resp->xbuf->page_len = maxcount;
2342
2343 /* Use rest of head for padding and remaining ops: */
2344 resp->xbuf->tail[0].iov_base = p;
2345 resp->xbuf->tail[0].iov_len = 0;
2346 if (maxcount&3) {
2347 RESERVE_SPACE(4);
2348 WRITE32(0);
2349 resp->xbuf->tail[0].iov_base += maxcount&3;
2350 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2351 ADJUST_ARGS();
2352 }
2353 return 0;
2354 }
2355
2356 static __be32
2357 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2358 {
2359 int maxcount;
2360 loff_t offset;
2361 __be32 *page, *savep, *tailbase;
2362 ENCODE_HEAD;
2363
2364 if (nfserr)
2365 return nfserr;
2366 if (resp->xbuf->page_len)
2367 return nfserr_resource;
2368
2369 RESERVE_SPACE(8); /* verifier */
2370 savep = p;
2371
2372 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2373 WRITE32(0);
2374 WRITE32(0);
2375 ADJUST_ARGS();
2376 resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2377 tailbase = p;
2378
2379 maxcount = PAGE_SIZE;
2380 if (maxcount > readdir->rd_maxcount)
2381 maxcount = readdir->rd_maxcount;
2382
2383 /*
2384 * Convert from bytes to words, account for the two words already
2385 * written, make sure to leave two words at the end for the next
2386 * pointer and eof field.
2387 */
2388 maxcount = (maxcount >> 2) - 4;
2389 if (maxcount < 0) {
2390 nfserr = nfserr_toosmall;
2391 goto err_no_verf;
2392 }
2393
2394 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2395 readdir->common.err = 0;
2396 readdir->buflen = maxcount;
2397 readdir->buffer = page;
2398 readdir->offset = NULL;
2399
2400 offset = readdir->rd_cookie;
2401 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2402 &offset,
2403 &readdir->common, nfsd4_encode_dirent);
2404 if (nfserr == nfs_ok &&
2405 readdir->common.err == nfserr_toosmall &&
2406 readdir->buffer == page)
2407 nfserr = nfserr_toosmall;
2408 if (nfserr == nfserr_symlink)
2409 nfserr = nfserr_notdir;
2410 if (nfserr)
2411 goto err_no_verf;
2412
2413 if (readdir->offset)
2414 xdr_encode_hyper(readdir->offset, offset);
2415
2416 p = readdir->buffer;
2417 *p++ = 0; /* no more entries */
2418 *p++ = htonl(readdir->common.err == nfserr_eof);
2419 resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2420 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2421
2422 /* Use rest of head for padding and remaining ops: */
2423 resp->xbuf->tail[0].iov_base = tailbase;
2424 resp->xbuf->tail[0].iov_len = 0;
2425 resp->p = resp->xbuf->tail[0].iov_base;
2426 resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2427
2428 return 0;
2429 err_no_verf:
2430 p = savep;
2431 ADJUST_ARGS();
2432 return nfserr;
2433 }
2434
2435 static __be32
2436 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2437 {
2438 ENCODE_HEAD;
2439
2440 if (!nfserr) {
2441 RESERVE_SPACE(20);
2442 WRITECINFO(remove->rm_cinfo);
2443 ADJUST_ARGS();
2444 }
2445 return nfserr;
2446 }
2447
2448 static __be32
2449 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2450 {
2451 ENCODE_HEAD;
2452
2453 if (!nfserr) {
2454 RESERVE_SPACE(40);
2455 WRITECINFO(rename->rn_sinfo);
2456 WRITECINFO(rename->rn_tinfo);
2457 ADJUST_ARGS();
2458 }
2459 return nfserr;
2460 }
2461
2462 static __be32
2463 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2464 struct nfsd4_secinfo *secinfo)
2465 {
2466 int i = 0;
2467 struct svc_export *exp = secinfo->si_exp;
2468 u32 nflavs;
2469 struct exp_flavor_info *flavs;
2470 struct exp_flavor_info def_flavs[2];
2471 ENCODE_HEAD;
2472
2473 if (nfserr)
2474 goto out;
2475 if (exp->ex_nflavors) {
2476 flavs = exp->ex_flavors;
2477 nflavs = exp->ex_nflavors;
2478 } else { /* Handling of some defaults in absence of real secinfo: */
2479 flavs = def_flavs;
2480 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2481 nflavs = 2;
2482 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2483 flavs[1].pseudoflavor = RPC_AUTH_NULL;
2484 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2485 nflavs = 1;
2486 flavs[0].pseudoflavor
2487 = svcauth_gss_flavor(exp->ex_client);
2488 } else {
2489 nflavs = 1;
2490 flavs[0].pseudoflavor
2491 = exp->ex_client->flavour->flavour;
2492 }
2493 }
2494
2495 RESERVE_SPACE(4);
2496 WRITE32(nflavs);
2497 ADJUST_ARGS();
2498 for (i = 0; i < nflavs; i++) {
2499 u32 flav = flavs[i].pseudoflavor;
2500 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2501
2502 if (gm) {
2503 RESERVE_SPACE(4);
2504 WRITE32(RPC_AUTH_GSS);
2505 ADJUST_ARGS();
2506 RESERVE_SPACE(4 + gm->gm_oid.len);
2507 WRITE32(gm->gm_oid.len);
2508 WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2509 ADJUST_ARGS();
2510 RESERVE_SPACE(4);
2511 WRITE32(0); /* qop */
2512 ADJUST_ARGS();
2513 RESERVE_SPACE(4);
2514 WRITE32(gss_pseudoflavor_to_service(gm, flav));
2515 ADJUST_ARGS();
2516 gss_mech_put(gm);
2517 } else {
2518 RESERVE_SPACE(4);
2519 WRITE32(flav);
2520 ADJUST_ARGS();
2521 }
2522 }
2523 out:
2524 if (exp)
2525 exp_put(exp);
2526 return nfserr;
2527 }
2528
2529 /*
2530 * The SETATTR encode routine is special -- it always encodes a bitmap,
2531 * regardless of the error status.
2532 */
2533 static __be32
2534 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2535 {
2536 ENCODE_HEAD;
2537
2538 RESERVE_SPACE(12);
2539 if (nfserr) {
2540 WRITE32(2);
2541 WRITE32(0);
2542 WRITE32(0);
2543 }
2544 else {
2545 WRITE32(2);
2546 WRITE32(setattr->sa_bmval[0]);
2547 WRITE32(setattr->sa_bmval[1]);
2548 }
2549 ADJUST_ARGS();
2550 return nfserr;
2551 }
2552
2553 static __be32
2554 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2555 {
2556 ENCODE_HEAD;
2557
2558 if (!nfserr) {
2559 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2560 WRITEMEM(&scd->se_clientid, 8);
2561 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2562 ADJUST_ARGS();
2563 }
2564 else if (nfserr == nfserr_clid_inuse) {
2565 RESERVE_SPACE(8);
2566 WRITE32(0);
2567 WRITE32(0);
2568 ADJUST_ARGS();
2569 }
2570 return nfserr;
2571 }
2572
2573 static __be32
2574 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2575 {
2576 ENCODE_HEAD;
2577
2578 if (!nfserr) {
2579 RESERVE_SPACE(16);
2580 WRITE32(write->wr_bytes_written);
2581 WRITE32(write->wr_how_written);
2582 WRITEMEM(write->wr_verifier.data, 8);
2583 ADJUST_ARGS();
2584 }
2585 return nfserr;
2586 }
2587
2588 static __be32
2589 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
2590 {
2591 return nfserr;
2592 }
2593
2594 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
2595
2596 static nfsd4_enc nfsd4_enc_ops[] = {
2597 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
2598 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
2599 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
2600 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
2601 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
2602 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
2603 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
2604 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
2605 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
2606 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
2607 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
2608 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
2609 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
2610 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
2611 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
2612 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
2613 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
2614 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
2615 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
2616 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
2617 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
2618 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
2619 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
2620 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
2621 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
2622 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
2623 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
2624 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
2625 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
2626 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
2627 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
2628 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
2629 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
2630 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
2631 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
2632 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
2633 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
2634 };
2635
2636 void
2637 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2638 {
2639 __be32 *statp;
2640 ENCODE_HEAD;
2641
2642 RESERVE_SPACE(8);
2643 WRITE32(op->opnum);
2644 statp = p++; /* to be backfilled at the end */
2645 ADJUST_ARGS();
2646
2647 if (op->opnum == OP_ILLEGAL)
2648 goto status;
2649 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
2650 !nfsd4_enc_ops[op->opnum]);
2651 op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
2652 status:
2653 /*
2654 * Note: We write the status directly, instead of using WRITE32(),
2655 * since it is already in network byte order.
2656 */
2657 *statp = op->status;
2658 }
2659
2660 /*
2661 * Encode the reply stored in the stateowner reply cache
2662 *
2663 * XDR note: do not encode rp->rp_buflen: the buffer contains the
2664 * previously sent already encoded operation.
2665 *
2666 * called with nfs4_lock_state() held
2667 */
2668 void
2669 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2670 {
2671 ENCODE_HEAD;
2672 struct nfs4_replay *rp = op->replay;
2673
2674 BUG_ON(!rp);
2675
2676 RESERVE_SPACE(8);
2677 WRITE32(op->opnum);
2678 *p++ = rp->rp_status; /* already xdr'ed */
2679 ADJUST_ARGS();
2680
2681 RESERVE_SPACE(rp->rp_buflen);
2682 WRITEMEM(rp->rp_buf, rp->rp_buflen);
2683 ADJUST_ARGS();
2684 }
2685
2686 /*
2687 * END OF "GENERIC" ENCODE ROUTINES.
2688 */
2689
2690 int
2691 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2692 {
2693 return xdr_ressize_check(rqstp, p);
2694 }
2695
2696 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2697 {
2698 if (args->ops != args->iops) {
2699 kfree(args->ops);
2700 args->ops = args->iops;
2701 }
2702 kfree(args->tmpp);
2703 args->tmpp = NULL;
2704 while (args->to_free) {
2705 struct tmpbuf *tb = args->to_free;
2706 args->to_free = tb->next;
2707 tb->release(tb->buf);
2708 kfree(tb);
2709 }
2710 }
2711
2712 int
2713 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2714 {
2715 __be32 status;
2716
2717 args->p = p;
2718 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2719 args->pagelist = rqstp->rq_arg.pages;
2720 args->pagelen = rqstp->rq_arg.page_len;
2721 args->tmpp = NULL;
2722 args->to_free = NULL;
2723 args->ops = args->iops;
2724 args->rqstp = rqstp;
2725
2726 status = nfsd4_decode_compound(args);
2727 if (status) {
2728 nfsd4_release_compoundargs(args);
2729 }
2730 return !status;
2731 }
2732
2733 int
2734 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2735 {
2736 /*
2737 * All that remains is to write the tag and operation count...
2738 */
2739 struct kvec *iov;
2740 p = resp->tagp;
2741 *p++ = htonl(resp->taglen);
2742 memcpy(p, resp->tag, resp->taglen);
2743 p += XDR_QUADLEN(resp->taglen);
2744 *p++ = htonl(resp->opcnt);
2745
2746 if (rqstp->rq_res.page_len)
2747 iov = &rqstp->rq_res.tail[0];
2748 else
2749 iov = &rqstp->rq_res.head[0];
2750 iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2751 BUG_ON(iov->iov_len > PAGE_SIZE);
2752 return 1;
2753 }
2754
2755 /*
2756 * Local variables:
2757 * c-basic-offset: 8
2758 * End:
2759 */
Nao low-level kernelspace/userspace library that runs on our robots, Nao-Team HTWK