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thinkpad-acpi: R52 brightness_mode has been confirmed
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfsd / nfs4xdr.c
blob0df5a9e0bd07befd44d5467e47b6e0c47682b39c
1 /*
2 * fs/nfs/nfs4xdr.c
3 *
4 * Server-side XDR 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 * TODO: Neil Brown made the following observation: We currently
38 * initially reserve NFSD_BUFSIZE space on the transmit queue and
39 * never release any of that until the request is complete.
40 * It would be good to calculate a new maximum response size while
41 * decoding the COMPOUND, and call svc_reserve with this number
42 * at the end of nfs4svc_decode_compoundargs.
43 */
44
45 #include <linux/param.h>
46 #include <linux/smp.h>
47 #include <linux/fs.h>
48 #include <linux/namei.h>
49 #include <linux/vfs.h>
50 #include <linux/sunrpc/xdr.h>
51 #include <linux/sunrpc/svc.h>
52 #include <linux/sunrpc/clnt.h>
53 #include <linux/nfsd/nfsd.h>
54 #include <linux/nfsd/state.h>
55 #include <linux/nfsd/xdr4.h>
56 #include <linux/nfsd_idmap.h>
57 #include <linux/nfs4.h>
58 #include <linux/nfs4_acl.h>
59 #include <linux/sunrpc/gss_api.h>
60 #include <linux/sunrpc/svcauth_gss.h>
61
62 #define NFSDDBG_FACILITY NFSDDBG_XDR
63
64 /*
65 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
66 * directory in order to indicate to the client that a filesystem boundary is present
67 * We use a fixed fsid for a referral
68 */
69 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
70 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
71
72 static __be32
73 check_filename(char *str, int len, __be32 err)
74 {
75 int i;
76
77 if (len == 0)
78 return nfserr_inval;
79 if (isdotent(str, len))
80 return err;
81 for (i = 0; i < len; i++)
82 if (str[i] == '/')
83 return err;
84 return 0;
85 }
86
87 /*
88 * START OF "GENERIC" DECODE ROUTINES.
89 * These may look a little ugly since they are imported from a "generic"
90 * set of XDR encode/decode routines which are intended to be shared by
91 * all of our NFSv4 implementations (OpenBSD, MacOS X...).
92 *
93 * If the pain of reading these is too great, it should be a straightforward
94 * task to translate them into Linux-specific versions which are more
95 * consistent with the style used in NFSv2/v3...
96 */
97 #define DECODE_HEAD \
98 __be32 *p; \
99 __be32 status
100 #define DECODE_TAIL \
101 status = 0; \
102 out: \
103 return status; \
104 xdr_error: \
105 dprintk("NFSD: xdr error (%s:%d)\n", \
106 __FILE__, __LINE__); \
107 status = nfserr_bad_xdr; \
108 goto out
109
110 #define READ32(x) (x) = ntohl(*p++)
111 #define READ64(x) do { \
112 (x) = (u64)ntohl(*p++) << 32; \
113 (x) |= ntohl(*p++); \
114 } while (0)
115 #define READTIME(x) do { \
116 p++; \
117 (x) = ntohl(*p++); \
118 p++; \
119 } while (0)
120 #define READMEM(x,nbytes) do { \
121 x = (char *)p; \
122 p += XDR_QUADLEN(nbytes); \
123 } while (0)
124 #define SAVEMEM(x,nbytes) do { \
125 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
126 savemem(argp, p, nbytes) : \
127 (char *)p)) { \
128 dprintk("NFSD: xdr error (%s:%d)\n", \
129 __FILE__, __LINE__); \
130 goto xdr_error; \
131 } \
132 p += XDR_QUADLEN(nbytes); \
133 } while (0)
134 #define COPYMEM(x,nbytes) do { \
135 memcpy((x), p, nbytes); \
136 p += XDR_QUADLEN(nbytes); \
137 } while (0)
138
139 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
140 #define READ_BUF(nbytes) do { \
141 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
142 p = argp->p; \
143 argp->p += XDR_QUADLEN(nbytes); \
144 } else if (!(p = read_buf(argp, nbytes))) { \
145 dprintk("NFSD: xdr error (%s:%d)\n", \
146 __FILE__, __LINE__); \
147 goto xdr_error; \
148 } \
149 } while (0)
150
151 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
152 {
153 /* We want more bytes than seem to be available.
154 * Maybe we need a new page, maybe we have just run out
155 */
156 unsigned int avail = (char *)argp->end - (char *)argp->p;
157 __be32 *p;
158 if (avail + argp->pagelen < nbytes)
159 return NULL;
160 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
161 return NULL;
162 /* ok, we can do it with the current plus the next page */
163 if (nbytes <= sizeof(argp->tmp))
164 p = argp->tmp;
165 else {
166 kfree(argp->tmpp);
167 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
168 if (!p)
169 return NULL;
170
171 }
172 /*
173 * The following memcpy is safe because read_buf is always
174 * called with nbytes > avail, and the two cases above both
175 * guarantee p points to at least nbytes bytes.
176 */
177 memcpy(p, argp->p, avail);
178 /* step to next page */
179 argp->p = page_address(argp->pagelist[0]);
180 argp->pagelist++;
181 if (argp->pagelen < PAGE_SIZE) {
182 argp->end = argp->p + (argp->pagelen>>2);
183 argp->pagelen = 0;
184 } else {
185 argp->end = argp->p + (PAGE_SIZE>>2);
186 argp->pagelen -= PAGE_SIZE;
187 }
188 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
189 argp->p += XDR_QUADLEN(nbytes - avail);
190 return p;
191 }
192
193 static int
194 defer_free(struct nfsd4_compoundargs *argp,
195 void (*release)(const void *), void *p)
196 {
197 struct tmpbuf *tb;
198
199 tb = kmalloc(sizeof(*tb), GFP_KERNEL);
200 if (!tb)
201 return -ENOMEM;
202 tb->buf = p;
203 tb->release = release;
204 tb->next = argp->to_free;
205 argp->to_free = tb;
206 return 0;
207 }
208
209 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
210 {
211 if (p == argp->tmp) {
212 p = kmalloc(nbytes, GFP_KERNEL);
213 if (!p)
214 return NULL;
215 memcpy(p, argp->tmp, nbytes);
216 } else {
217 BUG_ON(p != argp->tmpp);
218 argp->tmpp = NULL;
219 }
220 if (defer_free(argp, kfree, p)) {
221 kfree(p);
222 return NULL;
223 } else
224 return (char *)p;
225 }
226
227 static __be32
228 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
229 {
230 u32 bmlen;
231 DECODE_HEAD;
232
233 bmval[0] = 0;
234 bmval[1] = 0;
235
236 READ_BUF(4);
237 READ32(bmlen);
238 if (bmlen > 1000)
239 goto xdr_error;
240
241 READ_BUF(bmlen << 2);
242 if (bmlen > 0)
243 READ32(bmval[0]);
244 if (bmlen > 1)
245 READ32(bmval[1]);
246
247 DECODE_TAIL;
248 }
249
250 static __be32
251 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
252 struct nfs4_acl **acl)
253 {
254 int expected_len, len = 0;
255 u32 dummy32;
256 char *buf;
257 int host_err;
258
259 DECODE_HEAD;
260 iattr->ia_valid = 0;
261 if ((status = nfsd4_decode_bitmap(argp, bmval)))
262 return status;
263
264 /*
265 * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
266 * read-only attributes return ERR_INVAL.
267 */
268 if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
269 return nfserr_attrnotsupp;
270 if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
271 return nfserr_inval;
272
273 READ_BUF(4);
274 READ32(expected_len);
275
276 if (bmval[0] & FATTR4_WORD0_SIZE) {
277 READ_BUF(8);
278 len += 8;
279 READ64(iattr->ia_size);
280 iattr->ia_valid |= ATTR_SIZE;
281 }
282 if (bmval[0] & FATTR4_WORD0_ACL) {
283 int nace;
284 struct nfs4_ace *ace;
285
286 READ_BUF(4); len += 4;
287 READ32(nace);
288
289 if (nace > NFS4_ACL_MAX)
290 return nfserr_resource;
291
292 *acl = nfs4_acl_new(nace);
293 if (*acl == NULL) {
294 host_err = -ENOMEM;
295 goto out_nfserr;
296 }
297 defer_free(argp, kfree, *acl);
298
299 (*acl)->naces = nace;
300 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
301 READ_BUF(16); len += 16;
302 READ32(ace->type);
303 READ32(ace->flag);
304 READ32(ace->access_mask);
305 READ32(dummy32);
306 READ_BUF(dummy32);
307 len += XDR_QUADLEN(dummy32) << 2;
308 READMEM(buf, dummy32);
309 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
310 host_err = 0;
311 if (ace->whotype != NFS4_ACL_WHO_NAMED)
312 ace->who = 0;
313 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
314 host_err = nfsd_map_name_to_gid(argp->rqstp,
315 buf, dummy32, &ace->who);
316 else
317 host_err = nfsd_map_name_to_uid(argp->rqstp,
318 buf, dummy32, &ace->who);
319 if (host_err)
320 goto out_nfserr;
321 }
322 } else
323 *acl = NULL;
324 if (bmval[1] & FATTR4_WORD1_MODE) {
325 READ_BUF(4);
326 len += 4;
327 READ32(iattr->ia_mode);
328 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
329 iattr->ia_valid |= ATTR_MODE;
330 }
331 if (bmval[1] & FATTR4_WORD1_OWNER) {
332 READ_BUF(4);
333 len += 4;
334 READ32(dummy32);
335 READ_BUF(dummy32);
336 len += (XDR_QUADLEN(dummy32) << 2);
337 READMEM(buf, dummy32);
338 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
339 return status;
340 iattr->ia_valid |= ATTR_UID;
341 }
342 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
343 READ_BUF(4);
344 len += 4;
345 READ32(dummy32);
346 READ_BUF(dummy32);
347 len += (XDR_QUADLEN(dummy32) << 2);
348 READMEM(buf, dummy32);
349 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
350 return status;
351 iattr->ia_valid |= ATTR_GID;
352 }
353 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
354 READ_BUF(4);
355 len += 4;
356 READ32(dummy32);
357 switch (dummy32) {
358 case NFS4_SET_TO_CLIENT_TIME:
359 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
360 all 32 bits of 'nseconds'. */
361 READ_BUF(12);
362 len += 12;
363 READ32(dummy32);
364 if (dummy32)
365 return nfserr_inval;
366 READ32(iattr->ia_atime.tv_sec);
367 READ32(iattr->ia_atime.tv_nsec);
368 if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
369 return nfserr_inval;
370 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
371 break;
372 case NFS4_SET_TO_SERVER_TIME:
373 iattr->ia_valid |= ATTR_ATIME;
374 break;
375 default:
376 goto xdr_error;
377 }
378 }
379 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
380 READ_BUF(4);
381 len += 4;
382 READ32(dummy32);
383 switch (dummy32) {
384 case NFS4_SET_TO_CLIENT_TIME:
385 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
386 all 32 bits of 'nseconds'. */
387 READ_BUF(12);
388 len += 12;
389 READ32(dummy32);
390 if (dummy32)
391 return nfserr_inval;
392 READ32(iattr->ia_mtime.tv_sec);
393 READ32(iattr->ia_mtime.tv_nsec);
394 if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
395 return nfserr_inval;
396 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
397 break;
398 case NFS4_SET_TO_SERVER_TIME:
399 iattr->ia_valid |= ATTR_MTIME;
400 break;
401 default:
402 goto xdr_error;
403 }
404 }
405 if (len != expected_len)
406 goto xdr_error;
407
408 DECODE_TAIL;
409
410 out_nfserr:
411 status = nfserrno(host_err);
412 goto out;
413 }
414
415 static __be32
416 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
417 {
418 DECODE_HEAD;
419
420 READ_BUF(4);
421 READ32(access->ac_req_access);
422
423 DECODE_TAIL;
424 }
425
426 static __be32
427 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
428 {
429 DECODE_HEAD;
430
431 close->cl_stateowner = NULL;
432 READ_BUF(4 + sizeof(stateid_t));
433 READ32(close->cl_seqid);
434 READ32(close->cl_stateid.si_generation);
435 COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
436
437 DECODE_TAIL;
438 }
439
440
441 static __be32
442 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
443 {
444 DECODE_HEAD;
445
446 READ_BUF(12);
447 READ64(commit->co_offset);
448 READ32(commit->co_count);
449
450 DECODE_TAIL;
451 }
452
453 static __be32
454 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
455 {
456 DECODE_HEAD;
457
458 READ_BUF(4);
459 READ32(create->cr_type);
460 switch (create->cr_type) {
461 case NF4LNK:
462 READ_BUF(4);
463 READ32(create->cr_linklen);
464 READ_BUF(create->cr_linklen);
465 SAVEMEM(create->cr_linkname, create->cr_linklen);
466 break;
467 case NF4BLK:
468 case NF4CHR:
469 READ_BUF(8);
470 READ32(create->cr_specdata1);
471 READ32(create->cr_specdata2);
472 break;
473 case NF4SOCK:
474 case NF4FIFO:
475 case NF4DIR:
476 default:
477 break;
478 }
479
480 READ_BUF(4);
481 READ32(create->cr_namelen);
482 READ_BUF(create->cr_namelen);
483 SAVEMEM(create->cr_name, create->cr_namelen);
484 if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
485 return status;
486
487 if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
488 goto out;
489
490 DECODE_TAIL;
491 }
492
493 static inline __be32
494 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
495 {
496 DECODE_HEAD;
497
498 READ_BUF(sizeof(stateid_t));
499 READ32(dr->dr_stateid.si_generation);
500 COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
501
502 DECODE_TAIL;
503 }
504
505 static inline __be32
506 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
507 {
508 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
509 }
510
511 static __be32
512 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
513 {
514 DECODE_HEAD;
515
516 READ_BUF(4);
517 READ32(link->li_namelen);
518 READ_BUF(link->li_namelen);
519 SAVEMEM(link->li_name, link->li_namelen);
520 if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
521 return status;
522
523 DECODE_TAIL;
524 }
525
526 static __be32
527 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
528 {
529 DECODE_HEAD;
530
531 lock->lk_replay_owner = NULL;
532 /*
533 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
534 */
535 READ_BUF(28);
536 READ32(lock->lk_type);
537 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
538 goto xdr_error;
539 READ32(lock->lk_reclaim);
540 READ64(lock->lk_offset);
541 READ64(lock->lk_length);
542 READ32(lock->lk_is_new);
543
544 if (lock->lk_is_new) {
545 READ_BUF(36);
546 READ32(lock->lk_new_open_seqid);
547 READ32(lock->lk_new_open_stateid.si_generation);
548
549 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
550 READ32(lock->lk_new_lock_seqid);
551 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
552 READ32(lock->lk_new_owner.len);
553 READ_BUF(lock->lk_new_owner.len);
554 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
555 } else {
556 READ_BUF(20);
557 READ32(lock->lk_old_lock_stateid.si_generation);
558 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
559 READ32(lock->lk_old_lock_seqid);
560 }
561
562 DECODE_TAIL;
563 }
564
565 static __be32
566 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
567 {
568 DECODE_HEAD;
569
570 READ_BUF(32);
571 READ32(lockt->lt_type);
572 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
573 goto xdr_error;
574 READ64(lockt->lt_offset);
575 READ64(lockt->lt_length);
576 COPYMEM(&lockt->lt_clientid, 8);
577 READ32(lockt->lt_owner.len);
578 READ_BUF(lockt->lt_owner.len);
579 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
580
581 DECODE_TAIL;
582 }
583
584 static __be32
585 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
586 {
587 DECODE_HEAD;
588
589 locku->lu_stateowner = NULL;
590 READ_BUF(24 + sizeof(stateid_t));
591 READ32(locku->lu_type);
592 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
593 goto xdr_error;
594 READ32(locku->lu_seqid);
595 READ32(locku->lu_stateid.si_generation);
596 COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
597 READ64(locku->lu_offset);
598 READ64(locku->lu_length);
599
600 DECODE_TAIL;
601 }
602
603 static __be32
604 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
605 {
606 DECODE_HEAD;
607
608 READ_BUF(4);
609 READ32(lookup->lo_len);
610 READ_BUF(lookup->lo_len);
611 SAVEMEM(lookup->lo_name, lookup->lo_len);
612 if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
613 return status;
614
615 DECODE_TAIL;
616 }
617
618 static __be32
619 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
620 {
621 DECODE_HEAD;
622
623 memset(open->op_bmval, 0, sizeof(open->op_bmval));
624 open->op_iattr.ia_valid = 0;
625 open->op_stateowner = NULL;
626
627 /* seqid, share_access, share_deny, clientid, ownerlen */
628 READ_BUF(16 + sizeof(clientid_t));
629 READ32(open->op_seqid);
630 READ32(open->op_share_access);
631 READ32(open->op_share_deny);
632 COPYMEM(&open->op_clientid, sizeof(clientid_t));
633 READ32(open->op_owner.len);
634
635 /* owner, open_flag */
636 READ_BUF(open->op_owner.len + 4);
637 SAVEMEM(open->op_owner.data, open->op_owner.len);
638 READ32(open->op_create);
639 switch (open->op_create) {
640 case NFS4_OPEN_NOCREATE:
641 break;
642 case NFS4_OPEN_CREATE:
643 READ_BUF(4);
644 READ32(open->op_createmode);
645 switch (open->op_createmode) {
646 case NFS4_CREATE_UNCHECKED:
647 case NFS4_CREATE_GUARDED:
648 if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
649 goto out;
650 break;
651 case NFS4_CREATE_EXCLUSIVE:
652 READ_BUF(8);
653 COPYMEM(open->op_verf.data, 8);
654 break;
655 default:
656 goto xdr_error;
657 }
658 break;
659 default:
660 goto xdr_error;
661 }
662
663 /* open_claim */
664 READ_BUF(4);
665 READ32(open->op_claim_type);
666 switch (open->op_claim_type) {
667 case NFS4_OPEN_CLAIM_NULL:
668 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
669 READ_BUF(4);
670 READ32(open->op_fname.len);
671 READ_BUF(open->op_fname.len);
672 SAVEMEM(open->op_fname.data, open->op_fname.len);
673 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
674 return status;
675 break;
676 case NFS4_OPEN_CLAIM_PREVIOUS:
677 READ_BUF(4);
678 READ32(open->op_delegate_type);
679 break;
680 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
681 READ_BUF(sizeof(stateid_t) + 4);
682 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
683 READ32(open->op_fname.len);
684 READ_BUF(open->op_fname.len);
685 SAVEMEM(open->op_fname.data, open->op_fname.len);
686 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
687 return status;
688 break;
689 default:
690 goto xdr_error;
691 }
692
693 DECODE_TAIL;
694 }
695
696 static __be32
697 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
698 {
699 DECODE_HEAD;
700
701 open_conf->oc_stateowner = NULL;
702 READ_BUF(4 + sizeof(stateid_t));
703 READ32(open_conf->oc_req_stateid.si_generation);
704 COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
705 READ32(open_conf->oc_seqid);
706
707 DECODE_TAIL;
708 }
709
710 static __be32
711 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
712 {
713 DECODE_HEAD;
714
715 open_down->od_stateowner = NULL;
716 READ_BUF(12 + sizeof(stateid_t));
717 READ32(open_down->od_stateid.si_generation);
718 COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
719 READ32(open_down->od_seqid);
720 READ32(open_down->od_share_access);
721 READ32(open_down->od_share_deny);
722
723 DECODE_TAIL;
724 }
725
726 static __be32
727 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
728 {
729 DECODE_HEAD;
730
731 READ_BUF(4);
732 READ32(putfh->pf_fhlen);
733 if (putfh->pf_fhlen > NFS4_FHSIZE)
734 goto xdr_error;
735 READ_BUF(putfh->pf_fhlen);
736 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
737
738 DECODE_TAIL;
739 }
740
741 static __be32
742 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
743 {
744 DECODE_HEAD;
745
746 READ_BUF(sizeof(stateid_t) + 12);
747 READ32(read->rd_stateid.si_generation);
748 COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
749 READ64(read->rd_offset);
750 READ32(read->rd_length);
751
752 DECODE_TAIL;
753 }
754
755 static __be32
756 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
757 {
758 DECODE_HEAD;
759
760 READ_BUF(24);
761 READ64(readdir->rd_cookie);
762 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
763 READ32(readdir->rd_dircount); /* just in case you needed a useless field... */
764 READ32(readdir->rd_maxcount);
765 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
766 goto out;
767
768 DECODE_TAIL;
769 }
770
771 static __be32
772 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
773 {
774 DECODE_HEAD;
775
776 READ_BUF(4);
777 READ32(remove->rm_namelen);
778 READ_BUF(remove->rm_namelen);
779 SAVEMEM(remove->rm_name, remove->rm_namelen);
780 if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
781 return status;
782
783 DECODE_TAIL;
784 }
785
786 static __be32
787 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
788 {
789 DECODE_HEAD;
790
791 READ_BUF(4);
792 READ32(rename->rn_snamelen);
793 READ_BUF(rename->rn_snamelen + 4);
794 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
795 READ32(rename->rn_tnamelen);
796 READ_BUF(rename->rn_tnamelen);
797 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
798 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
799 return status;
800 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
801 return status;
802
803 DECODE_TAIL;
804 }
805
806 static __be32
807 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
808 {
809 DECODE_HEAD;
810
811 READ_BUF(sizeof(clientid_t));
812 COPYMEM(clientid, sizeof(clientid_t));
813
814 DECODE_TAIL;
815 }
816
817 static __be32
818 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
819 struct nfsd4_secinfo *secinfo)
820 {
821 DECODE_HEAD;
822
823 READ_BUF(4);
824 READ32(secinfo->si_namelen);
825 READ_BUF(secinfo->si_namelen);
826 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
827 status = check_filename(secinfo->si_name, secinfo->si_namelen,
828 nfserr_noent);
829 if (status)
830 return status;
831 DECODE_TAIL;
832 }
833
834 static __be32
835 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
836 {
837 DECODE_HEAD;
838
839 READ_BUF(sizeof(stateid_t));
840 READ32(setattr->sa_stateid.si_generation);
841 COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
842 if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
843 goto out;
844
845 DECODE_TAIL;
846 }
847
848 static __be32
849 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
850 {
851 DECODE_HEAD;
852
853 READ_BUF(12);
854 COPYMEM(setclientid->se_verf.data, 8);
855 READ32(setclientid->se_namelen);
856
857 READ_BUF(setclientid->se_namelen + 8);
858 SAVEMEM(setclientid->se_name, setclientid->se_namelen);
859 READ32(setclientid->se_callback_prog);
860 READ32(setclientid->se_callback_netid_len);
861
862 READ_BUF(setclientid->se_callback_netid_len + 4);
863 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
864 READ32(setclientid->se_callback_addr_len);
865
866 READ_BUF(setclientid->se_callback_addr_len + 4);
867 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
868 READ32(setclientid->se_callback_ident);
869
870 DECODE_TAIL;
871 }
872
873 static __be32
874 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
875 {
876 DECODE_HEAD;
877
878 READ_BUF(8 + sizeof(nfs4_verifier));
879 COPYMEM(&scd_c->sc_clientid, 8);
880 COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
881
882 DECODE_TAIL;
883 }
884
885 /* Also used for NVERIFY */
886 static __be32
887 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
888 {
889 #if 0
890 struct nfsd4_compoundargs save = {
891 .p = argp->p,
892 .end = argp->end,
893 .rqstp = argp->rqstp,
894 };
895 u32 ve_bmval[2];
896 struct iattr ve_iattr; /* request */
897 struct nfs4_acl *ve_acl; /* request */
898 #endif
899 DECODE_HEAD;
900
901 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
902 goto out;
903
904 /* For convenience's sake, we compare raw xdr'd attributes in
905 * nfsd4_proc_verify; however we still decode here just to return
906 * correct error in case of bad xdr. */
907 #if 0
908 status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
909 if (status == nfserr_inval) {
910 status = nfserrno(status);
911 goto out;
912 }
913 #endif
914 READ_BUF(4);
915 READ32(verify->ve_attrlen);
916 READ_BUF(verify->ve_attrlen);
917 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
918
919 DECODE_TAIL;
920 }
921
922 static __be32
923 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
924 {
925 int avail;
926 int v;
927 int len;
928 DECODE_HEAD;
929
930 READ_BUF(sizeof(stateid_opaque_t) + 20);
931 READ32(write->wr_stateid.si_generation);
932 COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
933 READ64(write->wr_offset);
934 READ32(write->wr_stable_how);
935 if (write->wr_stable_how > 2)
936 goto xdr_error;
937 READ32(write->wr_buflen);
938
939 /* Sorry .. no magic macros for this.. *
940 * READ_BUF(write->wr_buflen);
941 * SAVEMEM(write->wr_buf, write->wr_buflen);
942 */
943 avail = (char*)argp->end - (char*)argp->p;
944 if (avail + argp->pagelen < write->wr_buflen) {
945 dprintk("NFSD: xdr error (%s:%d)\n",
946 __FILE__, __LINE__);
947 goto xdr_error;
948 }
949 argp->rqstp->rq_vec[0].iov_base = p;
950 argp->rqstp->rq_vec[0].iov_len = avail;
951 v = 0;
952 len = write->wr_buflen;
953 while (len > argp->rqstp->rq_vec[v].iov_len) {
954 len -= argp->rqstp->rq_vec[v].iov_len;
955 v++;
956 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
957 argp->pagelist++;
958 if (argp->pagelen >= PAGE_SIZE) {
959 argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
960 argp->pagelen -= PAGE_SIZE;
961 } else {
962 argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
963 argp->pagelen -= len;
964 }
965 }
966 argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
967 argp->p = (__be32*) (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
968 argp->rqstp->rq_vec[v].iov_len = len;
969 write->wr_vlen = v+1;
970
971 DECODE_TAIL;
972 }
973
974 static __be32
975 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
976 {
977 DECODE_HEAD;
978
979 READ_BUF(12);
980 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
981 READ32(rlockowner->rl_owner.len);
982 READ_BUF(rlockowner->rl_owner.len);
983 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
984
985 DECODE_TAIL;
986 }
987
988 static __be32
989 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
990 {
991 return nfs_ok;
992 }
993
994 static __be32
995 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
996 {
997 return nfserr_opnotsupp;
998 }
999
1000 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1001
1002 static nfsd4_dec nfsd4_dec_ops[] = {
1003 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1004 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1005 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1006 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1007 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1008 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1009 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1010 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1011 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1012 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1013 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1014 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1015 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1016 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1017 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1018 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1019 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1020 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1021 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1022 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1023 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_notsupp,
1024 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1025 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1026 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1027 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1028 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1029 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1030 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1031 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1032 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1033 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1034 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1035 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1036 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1037 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1038 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1039 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1040 };
1041
1042 struct nfsd4_minorversion_ops {
1043 nfsd4_dec *decoders;
1044 int nops;
1045 };
1046
1047 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1048 [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1049 };
1050
1051 static __be32
1052 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1053 {
1054 DECODE_HEAD;
1055 struct nfsd4_op *op;
1056 struct nfsd4_minorversion_ops *ops;
1057 int i;
1058
1059 /*
1060 * XXX: According to spec, we should check the tag
1061 * for UTF-8 compliance. I'm postponing this for
1062 * now because it seems that some clients do use
1063 * binary tags.
1064 */
1065 READ_BUF(4);
1066 READ32(argp->taglen);
1067 READ_BUF(argp->taglen + 8);
1068 SAVEMEM(argp->tag, argp->taglen);
1069 READ32(argp->minorversion);
1070 READ32(argp->opcnt);
1071
1072 if (argp->taglen > NFSD4_MAX_TAGLEN)
1073 goto xdr_error;
1074 if (argp->opcnt > 100)
1075 goto xdr_error;
1076
1077 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1078 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1079 if (!argp->ops) {
1080 argp->ops = argp->iops;
1081 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1082 goto xdr_error;
1083 }
1084 }
1085
1086 if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1087 argp->opcnt = 0;
1088
1089 ops = &nfsd4_minorversion[argp->minorversion];
1090 for (i = 0; i < argp->opcnt; i++) {
1091 op = &argp->ops[i];
1092 op->replay = NULL;
1093
1094 /*
1095 * We can't use READ_BUF() here because we need to handle
1096 * a missing opcode as an OP_WRITE + 1. So we need to check
1097 * to see if we're truly at the end of our buffer or if there
1098 * is another page we need to flip to.
1099 */
1100
1101 if (argp->p == argp->end) {
1102 if (argp->pagelen < 4) {
1103 /* There isn't an opcode still on the wire */
1104 op->opnum = OP_WRITE + 1;
1105 op->status = nfserr_bad_xdr;
1106 argp->opcnt = i+1;
1107 break;
1108 }
1109
1110 /*
1111 * False alarm. We just hit a page boundary, but there
1112 * is still data available. Move pointer across page
1113 * boundary. *snip from READ_BUF*
1114 */
1115 argp->p = page_address(argp->pagelist[0]);
1116 argp->pagelist++;
1117 if (argp->pagelen < PAGE_SIZE) {
1118 argp->end = argp->p + (argp->pagelen>>2);
1119 argp->pagelen = 0;
1120 } else {
1121 argp->end = argp->p + (PAGE_SIZE>>2);
1122 argp->pagelen -= PAGE_SIZE;
1123 }
1124 }
1125 op->opnum = ntohl(*argp->p++);
1126
1127 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1128 op->status = ops->decoders[op->opnum](argp, &op->u);
1129 else {
1130 op->opnum = OP_ILLEGAL;
1131 op->status = nfserr_op_illegal;
1132 }
1133
1134 if (op->status) {
1135 argp->opcnt = i+1;
1136 break;
1137 }
1138 }
1139
1140 DECODE_TAIL;
1141 }
1142 /*
1143 * END OF "GENERIC" DECODE ROUTINES.
1144 */
1145
1146 /*
1147 * START OF "GENERIC" ENCODE ROUTINES.
1148 * These may look a little ugly since they are imported from a "generic"
1149 * set of XDR encode/decode routines which are intended to be shared by
1150 * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1151 *
1152 * If the pain of reading these is too great, it should be a straightforward
1153 * task to translate them into Linux-specific versions which are more
1154 * consistent with the style used in NFSv2/v3...
1155 */
1156 #define ENCODE_HEAD __be32 *p
1157
1158 #define WRITE32(n) *p++ = htonl(n)
1159 #define WRITE64(n) do { \
1160 *p++ = htonl((u32)((n) >> 32)); \
1161 *p++ = htonl((u32)(n)); \
1162 } while (0)
1163 #define WRITEMEM(ptr,nbytes) do { if (nbytes > 0) { \
1164 *(p + XDR_QUADLEN(nbytes) -1) = 0; \
1165 memcpy(p, ptr, nbytes); \
1166 p += XDR_QUADLEN(nbytes); \
1167 }} while (0)
1168 #define WRITECINFO(c) do { \
1169 *p++ = htonl(c.atomic); \
1170 *p++ = htonl(c.before_ctime_sec); \
1171 *p++ = htonl(c.before_ctime_nsec); \
1172 *p++ = htonl(c.after_ctime_sec); \
1173 *p++ = htonl(c.after_ctime_nsec); \
1174 } while (0)
1175
1176 #define RESERVE_SPACE(nbytes) do { \
1177 p = resp->p; \
1178 BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end); \
1179 } while (0)
1180 #define ADJUST_ARGS() resp->p = p
1181
1182 /*
1183 * Header routine to setup seqid operation replay cache
1184 */
1185 #define ENCODE_SEQID_OP_HEAD \
1186 __be32 *p; \
1187 __be32 *save; \
1188 \
1189 save = resp->p;
1190
1191 /*
1192 * Routine for encoding the result of a "seqid-mutating" NFSv4 operation. This
1193 * is where sequence id's are incremented, and the replay cache is filled.
1194 * Note that we increment sequence id's here, at the last moment, so we're sure
1195 * we know whether the error to be returned is a sequence id mutating error.
1196 */
1197
1198 #define ENCODE_SEQID_OP_TAIL(stateowner) do { \
1199 if (seqid_mutating_err(nfserr) && stateowner) { \
1200 stateowner->so_seqid++; \
1201 stateowner->so_replay.rp_status = nfserr; \
1202 stateowner->so_replay.rp_buflen = \
1203 (((char *)(resp)->p - (char *)save)); \
1204 memcpy(stateowner->so_replay.rp_buf, save, \
1205 stateowner->so_replay.rp_buflen); \
1206 } } while (0);
1207
1208 /* Encode as an array of strings the string given with components
1209 * seperated @sep.
1210 */
1211 static __be32 nfsd4_encode_components(char sep, char *components,
1212 __be32 **pp, int *buflen)
1213 {
1214 __be32 *p = *pp;
1215 __be32 *countp = p;
1216 int strlen, count=0;
1217 char *str, *end;
1218
1219 dprintk("nfsd4_encode_components(%s)\n", components);
1220 if ((*buflen -= 4) < 0)
1221 return nfserr_resource;
1222 WRITE32(0); /* We will fill this in with @count later */
1223 end = str = components;
1224 while (*end) {
1225 for (; *end && (*end != sep); end++)
1226 ; /* Point to end of component */
1227 strlen = end - str;
1228 if (strlen) {
1229 if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1230 return nfserr_resource;
1231 WRITE32(strlen);
1232 WRITEMEM(str, strlen);
1233 count++;
1234 }
1235 else
1236 end++;
1237 str = end;
1238 }
1239 *pp = p;
1240 p = countp;
1241 WRITE32(count);
1242 return 0;
1243 }
1244
1245 /*
1246 * encode a location element of a fs_locations structure
1247 */
1248 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1249 __be32 **pp, int *buflen)
1250 {
1251 __be32 status;
1252 __be32 *p = *pp;
1253
1254 status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1255 if (status)
1256 return status;
1257 status = nfsd4_encode_components('/', location->path, &p, buflen);
1258 if (status)
1259 return status;
1260 *pp = p;
1261 return 0;
1262 }
1263
1264 /*
1265 * Return the path to an export point in the pseudo filesystem namespace
1266 * Returned string is safe to use as long as the caller holds a reference
1267 * to @exp.
1268 */
1269 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1270 {
1271 struct svc_fh tmp_fh;
1272 char *path, *rootpath;
1273
1274 fh_init(&tmp_fh, NFS4_FHSIZE);
1275 *stat = exp_pseudoroot(rqstp, &tmp_fh);
1276 if (*stat)
1277 return NULL;
1278 rootpath = tmp_fh.fh_export->ex_pathname;
1279
1280 path = exp->ex_pathname;
1281
1282 if (strncmp(path, rootpath, strlen(rootpath))) {
1283 dprintk("nfsd: fs_locations failed;"
1284 "%s is not contained in %s\n", path, rootpath);
1285 *stat = nfserr_notsupp;
1286 return NULL;
1287 }
1288
1289 return path + strlen(rootpath);
1290 }
1291
1292 /*
1293 * encode a fs_locations structure
1294 */
1295 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1296 struct svc_export *exp,
1297 __be32 **pp, int *buflen)
1298 {
1299 __be32 status;
1300 int i;
1301 __be32 *p = *pp;
1302 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1303 char *root = nfsd4_path(rqstp, exp, &status);
1304
1305 if (status)
1306 return status;
1307 status = nfsd4_encode_components('/', root, &p, buflen);
1308 if (status)
1309 return status;
1310 if ((*buflen -= 4) < 0)
1311 return nfserr_resource;
1312 WRITE32(fslocs->locations_count);
1313 for (i=0; i<fslocs->locations_count; i++) {
1314 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1315 &p, buflen);
1316 if (status)
1317 return status;
1318 }
1319 *pp = p;
1320 return 0;
1321 }
1322
1323 static u32 nfs4_ftypes[16] = {
1324 NF4BAD, NF4FIFO, NF4CHR, NF4BAD,
1325 NF4DIR, NF4BAD, NF4BLK, NF4BAD,
1326 NF4REG, NF4BAD, NF4LNK, NF4BAD,
1327 NF4SOCK, NF4BAD, NF4LNK, NF4BAD,
1328 };
1329
1330 static __be32
1331 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1332 __be32 **p, int *buflen)
1333 {
1334 int status;
1335
1336 if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1337 return nfserr_resource;
1338 if (whotype != NFS4_ACL_WHO_NAMED)
1339 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1340 else if (group)
1341 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1342 else
1343 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1344 if (status < 0)
1345 return nfserrno(status);
1346 *p = xdr_encode_opaque(*p, NULL, status);
1347 *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1348 BUG_ON(*buflen < 0);
1349 return 0;
1350 }
1351
1352 static inline __be32
1353 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1354 {
1355 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1356 }
1357
1358 static inline __be32
1359 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1360 {
1361 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1362 }
1363
1364 static inline __be32
1365 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1366 __be32 **p, int *buflen)
1367 {
1368 return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1369 }
1370
1371 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1372 FATTR4_WORD0_RDATTR_ERROR)
1373 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1374
1375 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1376 {
1377 /* As per referral draft: */
1378 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1379 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1380 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1381 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1382 *rdattr_err = NFSERR_MOVED;
1383 else
1384 return nfserr_moved;
1385 }
1386 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1387 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1388 return 0;
1389 }
1390
1391 /*
1392 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1393 * ourselves.
1394 *
1395 * @countp is the buffer size in _words_; upon successful return this becomes
1396 * replaced with the number of words written.
1397 */
1398 __be32
1399 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1400 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1401 struct svc_rqst *rqstp, int ignore_crossmnt)
1402 {
1403 u32 bmval0 = bmval[0];
1404 u32 bmval1 = bmval[1];
1405 struct kstat stat;
1406 struct svc_fh tempfh;
1407 struct kstatfs statfs;
1408 int buflen = *countp << 2;
1409 __be32 *attrlenp;
1410 u32 dummy;
1411 u64 dummy64;
1412 u32 rdattr_err = 0;
1413 __be32 *p = buffer;
1414 __be32 status;
1415 int err;
1416 int aclsupport = 0;
1417 struct nfs4_acl *acl = NULL;
1418
1419 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1420 BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1421 BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1422
1423 if (exp->ex_fslocs.migrated) {
1424 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1425 if (status)
1426 goto out;
1427 }
1428
1429 err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1430 if (err)
1431 goto out_nfserr;
1432 if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1433 FATTR4_WORD0_MAXNAME)) ||
1434 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1435 FATTR4_WORD1_SPACE_TOTAL))) {
1436 err = vfs_statfs(dentry, &statfs);
1437 if (err)
1438 goto out_nfserr;
1439 }
1440 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1441 fh_init(&tempfh, NFS4_FHSIZE);
1442 status = fh_compose(&tempfh, exp, dentry, NULL);
1443 if (status)
1444 goto out;
1445 fhp = &tempfh;
1446 }
1447 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1448 | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1449 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1450 aclsupport = (err == 0);
1451 if (bmval0 & FATTR4_WORD0_ACL) {
1452 if (err == -EOPNOTSUPP)
1453 bmval0 &= ~FATTR4_WORD0_ACL;
1454 else if (err == -EINVAL) {
1455 status = nfserr_attrnotsupp;
1456 goto out;
1457 } else if (err != 0)
1458 goto out_nfserr;
1459 }
1460 }
1461 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1462 if (exp->ex_fslocs.locations == NULL) {
1463 bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1464 }
1465 }
1466 if ((buflen -= 16) < 0)
1467 goto out_resource;
1468
1469 WRITE32(2);
1470 WRITE32(bmval0);
1471 WRITE32(bmval1);
1472 attrlenp = p++; /* to be backfilled later */
1473
1474 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1475 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1476 if ((buflen -= 12) < 0)
1477 goto out_resource;
1478 if (!aclsupport)
1479 word0 &= ~FATTR4_WORD0_ACL;
1480 if (!exp->ex_fslocs.locations)
1481 word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1482 WRITE32(2);
1483 WRITE32(word0);
1484 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1485 }
1486 if (bmval0 & FATTR4_WORD0_TYPE) {
1487 if ((buflen -= 4) < 0)
1488 goto out_resource;
1489 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1490 if (dummy == NF4BAD)
1491 goto out_serverfault;
1492 WRITE32(dummy);
1493 }
1494 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1495 if ((buflen -= 4) < 0)
1496 goto out_resource;
1497 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1498 WRITE32(NFS4_FH_PERSISTENT);
1499 else
1500 WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1501 }
1502 if (bmval0 & FATTR4_WORD0_CHANGE) {
1503 /*
1504 * Note: This _must_ be consistent with the scheme for writing
1505 * change_info, so any changes made here must be reflected there
1506 * as well. (See xdr4.h:set_change_info() and the WRITECINFO()
1507 * macro above.)
1508 */
1509 if ((buflen -= 8) < 0)
1510 goto out_resource;
1511 WRITE32(stat.ctime.tv_sec);
1512 WRITE32(stat.ctime.tv_nsec);
1513 }
1514 if (bmval0 & FATTR4_WORD0_SIZE) {
1515 if ((buflen -= 8) < 0)
1516 goto out_resource;
1517 WRITE64(stat.size);
1518 }
1519 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1520 if ((buflen -= 4) < 0)
1521 goto out_resource;
1522 WRITE32(1);
1523 }
1524 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1525 if ((buflen -= 4) < 0)
1526 goto out_resource;
1527 WRITE32(1);
1528 }
1529 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1530 if ((buflen -= 4) < 0)
1531 goto out_resource;
1532 WRITE32(0);
1533 }
1534 if (bmval0 & FATTR4_WORD0_FSID) {
1535 if ((buflen -= 16) < 0)
1536 goto out_resource;
1537 if (exp->ex_fslocs.migrated) {
1538 WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1539 WRITE64(NFS4_REFERRAL_FSID_MINOR);
1540 } else switch(fsid_source(fhp)) {
1541 case FSIDSOURCE_FSID:
1542 WRITE64((u64)exp->ex_fsid);
1543 WRITE64((u64)0);
1544 break;
1545 case FSIDSOURCE_DEV:
1546 WRITE32(0);
1547 WRITE32(MAJOR(stat.dev));
1548 WRITE32(0);
1549 WRITE32(MINOR(stat.dev));
1550 break;
1551 case FSIDSOURCE_UUID:
1552 WRITEMEM(exp->ex_uuid, 16);
1553 break;
1554 }
1555 }
1556 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1557 if ((buflen -= 4) < 0)
1558 goto out_resource;
1559 WRITE32(0);
1560 }
1561 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1562 if ((buflen -= 4) < 0)
1563 goto out_resource;
1564 WRITE32(NFSD_LEASE_TIME);
1565 }
1566 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1567 if ((buflen -= 4) < 0)
1568 goto out_resource;
1569 WRITE32(rdattr_err);
1570 }
1571 if (bmval0 & FATTR4_WORD0_ACL) {
1572 struct nfs4_ace *ace;
1573
1574 if (acl == NULL) {
1575 if ((buflen -= 4) < 0)
1576 goto out_resource;
1577
1578 WRITE32(0);
1579 goto out_acl;
1580 }
1581 if ((buflen -= 4) < 0)
1582 goto out_resource;
1583 WRITE32(acl->naces);
1584
1585 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1586 if ((buflen -= 4*3) < 0)
1587 goto out_resource;
1588 WRITE32(ace->type);
1589 WRITE32(ace->flag);
1590 WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1591 status = nfsd4_encode_aclname(rqstp, ace->whotype,
1592 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1593 &p, &buflen);
1594 if (status == nfserr_resource)
1595 goto out_resource;
1596 if (status)
1597 goto out;
1598 }
1599 }
1600 out_acl:
1601 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1602 if ((buflen -= 4) < 0)
1603 goto out_resource;
1604 WRITE32(aclsupport ?
1605 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1606 }
1607 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1608 if ((buflen -= 4) < 0)
1609 goto out_resource;
1610 WRITE32(1);
1611 }
1612 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1613 if ((buflen -= 4) < 0)
1614 goto out_resource;
1615 WRITE32(1);
1616 }
1617 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1618 if ((buflen -= 4) < 0)
1619 goto out_resource;
1620 WRITE32(1);
1621 }
1622 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1623 if ((buflen -= 4) < 0)
1624 goto out_resource;
1625 WRITE32(1);
1626 }
1627 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1628 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1629 if (buflen < 0)
1630 goto out_resource;
1631 WRITE32(fhp->fh_handle.fh_size);
1632 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1633 }
1634 if (bmval0 & FATTR4_WORD0_FILEID) {
1635 if ((buflen -= 8) < 0)
1636 goto out_resource;
1637 WRITE64(stat.ino);
1638 }
1639 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1640 if ((buflen -= 8) < 0)
1641 goto out_resource;
1642 WRITE64((u64) statfs.f_ffree);
1643 }
1644 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1645 if ((buflen -= 8) < 0)
1646 goto out_resource;
1647 WRITE64((u64) statfs.f_ffree);
1648 }
1649 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1650 if ((buflen -= 8) < 0)
1651 goto out_resource;
1652 WRITE64((u64) statfs.f_files);
1653 }
1654 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1655 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1656 if (status == nfserr_resource)
1657 goto out_resource;
1658 if (status)
1659 goto out;
1660 }
1661 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1662 if ((buflen -= 4) < 0)
1663 goto out_resource;
1664 WRITE32(1);
1665 }
1666 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1667 if ((buflen -= 8) < 0)
1668 goto out_resource;
1669 WRITE64(~(u64)0);
1670 }
1671 if (bmval0 & FATTR4_WORD0_MAXLINK) {
1672 if ((buflen -= 4) < 0)
1673 goto out_resource;
1674 WRITE32(255);
1675 }
1676 if (bmval0 & FATTR4_WORD0_MAXNAME) {
1677 if ((buflen -= 4) < 0)
1678 goto out_resource;
1679 WRITE32(statfs.f_namelen);
1680 }
1681 if (bmval0 & FATTR4_WORD0_MAXREAD) {
1682 if ((buflen -= 8) < 0)
1683 goto out_resource;
1684 WRITE64((u64) svc_max_payload(rqstp));
1685 }
1686 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1687 if ((buflen -= 8) < 0)
1688 goto out_resource;
1689 WRITE64((u64) svc_max_payload(rqstp));
1690 }
1691 if (bmval1 & FATTR4_WORD1_MODE) {
1692 if ((buflen -= 4) < 0)
1693 goto out_resource;
1694 WRITE32(stat.mode & S_IALLUGO);
1695 }
1696 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1697 if ((buflen -= 4) < 0)
1698 goto out_resource;
1699 WRITE32(1);
1700 }
1701 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1702 if ((buflen -= 4) < 0)
1703 goto out_resource;
1704 WRITE32(stat.nlink);
1705 }
1706 if (bmval1 & FATTR4_WORD1_OWNER) {
1707 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1708 if (status == nfserr_resource)
1709 goto out_resource;
1710 if (status)
1711 goto out;
1712 }
1713 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1714 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1715 if (status == nfserr_resource)
1716 goto out_resource;
1717 if (status)
1718 goto out;
1719 }
1720 if (bmval1 & FATTR4_WORD1_RAWDEV) {
1721 if ((buflen -= 8) < 0)
1722 goto out_resource;
1723 WRITE32((u32) MAJOR(stat.rdev));
1724 WRITE32((u32) MINOR(stat.rdev));
1725 }
1726 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1727 if ((buflen -= 8) < 0)
1728 goto out_resource;
1729 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1730 WRITE64(dummy64);
1731 }
1732 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1733 if ((buflen -= 8) < 0)
1734 goto out_resource;
1735 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1736 WRITE64(dummy64);
1737 }
1738 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1739 if ((buflen -= 8) < 0)
1740 goto out_resource;
1741 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1742 WRITE64(dummy64);
1743 }
1744 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1745 if ((buflen -= 8) < 0)
1746 goto out_resource;
1747 dummy64 = (u64)stat.blocks << 9;
1748 WRITE64(dummy64);
1749 }
1750 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1751 if ((buflen -= 12) < 0)
1752 goto out_resource;
1753 WRITE32(0);
1754 WRITE32(stat.atime.tv_sec);
1755 WRITE32(stat.atime.tv_nsec);
1756 }
1757 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1758 if ((buflen -= 12) < 0)
1759 goto out_resource;
1760 WRITE32(0);
1761 WRITE32(1);
1762 WRITE32(0);
1763 }
1764 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1765 if ((buflen -= 12) < 0)
1766 goto out_resource;
1767 WRITE32(0);
1768 WRITE32(stat.ctime.tv_sec);
1769 WRITE32(stat.ctime.tv_nsec);
1770 }
1771 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1772 if ((buflen -= 12) < 0)
1773 goto out_resource;
1774 WRITE32(0);
1775 WRITE32(stat.mtime.tv_sec);
1776 WRITE32(stat.mtime.tv_nsec);
1777 }
1778 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1779 if ((buflen -= 8) < 0)
1780 goto out_resource;
1781 /*
1782 * Get parent's attributes if not ignoring crossmount
1783 * and this is the root of a cross-mounted filesystem.
1784 */
1785 if (ignore_crossmnt == 0 &&
1786 exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
1787 err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
1788 exp->ex_path.mnt->mnt_mountpoint, &stat);
1789 if (err)
1790 goto out_nfserr;
1791 }
1792 WRITE64(stat.ino);
1793 }
1794 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1795 *countp = p - buffer;
1796 status = nfs_ok;
1797
1798 out:
1799 kfree(acl);
1800 if (fhp == &tempfh)
1801 fh_put(&tempfh);
1802 return status;
1803 out_nfserr:
1804 status = nfserrno(err);
1805 goto out;
1806 out_resource:
1807 *countp = 0;
1808 status = nfserr_resource;
1809 goto out;
1810 out_serverfault:
1811 status = nfserr_serverfault;
1812 goto out;
1813 }
1814
1815 static inline int attributes_need_mount(u32 *bmval)
1816 {
1817 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
1818 return 1;
1819 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
1820 return 1;
1821 return 0;
1822 }
1823
1824 static __be32
1825 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1826 const char *name, int namlen, __be32 *p, int *buflen)
1827 {
1828 struct svc_export *exp = cd->rd_fhp->fh_export;
1829 struct dentry *dentry;
1830 __be32 nfserr;
1831 int ignore_crossmnt = 0;
1832
1833 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1834 if (IS_ERR(dentry))
1835 return nfserrno(PTR_ERR(dentry));
1836 if (!dentry->d_inode) {
1837 /*
1838 * nfsd_buffered_readdir drops the i_mutex between
1839 * readdir and calling this callback, leaving a window
1840 * where this directory entry could have gone away.
1841 */
1842 dput(dentry);
1843 return nfserr_noent;
1844 }
1845
1846 exp_get(exp);
1847 /*
1848 * In the case of a mountpoint, the client may be asking for
1849 * attributes that are only properties of the underlying filesystem
1850 * as opposed to the cross-mounted file system. In such a case,
1851 * we will not follow the cross mount and will fill the attribtutes
1852 * directly from the mountpoint dentry.
1853 */
1854 if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
1855 ignore_crossmnt = 1;
1856 else if (d_mountpoint(dentry)) {
1857 int err;
1858
1859 /*
1860 * Why the heck aren't we just using nfsd_lookup??
1861 * Different "."/".." handling? Something else?
1862 * At least, add a comment here to explain....
1863 */
1864 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1865 if (err) {
1866 nfserr = nfserrno(err);
1867 goto out_put;
1868 }
1869 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
1870 if (nfserr)
1871 goto out_put;
1872
1873 }
1874 nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1875 cd->rd_rqstp, ignore_crossmnt);
1876 out_put:
1877 dput(dentry);
1878 exp_put(exp);
1879 return nfserr;
1880 }
1881
1882 static __be32 *
1883 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1884 {
1885 __be32 *attrlenp;
1886
1887 if (buflen < 6)
1888 return NULL;
1889 *p++ = htonl(2);
1890 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1891 *p++ = htonl(0); /* bmval1 */
1892
1893 attrlenp = p++;
1894 *p++ = nfserr; /* no htonl */
1895 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1896 return p;
1897 }
1898
1899 static int
1900 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1901 loff_t offset, u64 ino, unsigned int d_type)
1902 {
1903 struct readdir_cd *ccd = ccdv;
1904 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1905 int buflen;
1906 __be32 *p = cd->buffer;
1907 __be32 *cookiep;
1908 __be32 nfserr = nfserr_toosmall;
1909
1910 /* In nfsv4, "." and ".." never make it onto the wire.. */
1911 if (name && isdotent(name, namlen)) {
1912 cd->common.err = nfs_ok;
1913 return 0;
1914 }
1915
1916 if (cd->offset)
1917 xdr_encode_hyper(cd->offset, (u64) offset);
1918
1919 buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1920 if (buflen < 0)
1921 goto fail;
1922
1923 *p++ = xdr_one; /* mark entry present */
1924 cookiep = p;
1925 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
1926 p = xdr_encode_array(p, name, namlen); /* name length & name */
1927
1928 nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1929 switch (nfserr) {
1930 case nfs_ok:
1931 p += buflen;
1932 break;
1933 case nfserr_resource:
1934 nfserr = nfserr_toosmall;
1935 goto fail;
1936 case nfserr_dropit:
1937 goto fail;
1938 case nfserr_noent:
1939 goto skip_entry;
1940 default:
1941 /*
1942 * If the client requested the RDATTR_ERROR attribute,
1943 * we stuff the error code into this attribute
1944 * and continue. If this attribute was not requested,
1945 * then in accordance with the spec, we fail the
1946 * entire READDIR operation(!)
1947 */
1948 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1949 goto fail;
1950 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1951 if (p == NULL) {
1952 nfserr = nfserr_toosmall;
1953 goto fail;
1954 }
1955 }
1956 cd->buflen -= (p - cd->buffer);
1957 cd->buffer = p;
1958 cd->offset = cookiep;
1959 skip_entry:
1960 cd->common.err = nfs_ok;
1961 return 0;
1962 fail:
1963 cd->common.err = nfserr;
1964 return -EINVAL;
1965 }
1966
1967 static __be32
1968 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1969 {
1970 ENCODE_HEAD;
1971
1972 if (!nfserr) {
1973 RESERVE_SPACE(8);
1974 WRITE32(access->ac_supported);
1975 WRITE32(access->ac_resp_access);
1976 ADJUST_ARGS();
1977 }
1978 return nfserr;
1979 }
1980
1981 static __be32
1982 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
1983 {
1984 ENCODE_SEQID_OP_HEAD;
1985
1986 if (!nfserr) {
1987 RESERVE_SPACE(sizeof(stateid_t));
1988 WRITE32(close->cl_stateid.si_generation);
1989 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1990 ADJUST_ARGS();
1991 }
1992 ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1993 return nfserr;
1994 }
1995
1996
1997 static __be32
1998 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
1999 {
2000 ENCODE_HEAD;
2001
2002 if (!nfserr) {
2003 RESERVE_SPACE(8);
2004 WRITEMEM(commit->co_verf.data, 8);
2005 ADJUST_ARGS();
2006 }
2007 return nfserr;
2008 }
2009
2010 static __be32
2011 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2012 {
2013 ENCODE_HEAD;
2014
2015 if (!nfserr) {
2016 RESERVE_SPACE(32);
2017 WRITECINFO(create->cr_cinfo);
2018 WRITE32(2);
2019 WRITE32(create->cr_bmval[0]);
2020 WRITE32(create->cr_bmval[1]);
2021 ADJUST_ARGS();
2022 }
2023 return nfserr;
2024 }
2025
2026 static __be32
2027 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2028 {
2029 struct svc_fh *fhp = getattr->ga_fhp;
2030 int buflen;
2031
2032 if (nfserr)
2033 return nfserr;
2034
2035 buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2036 nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2037 resp->p, &buflen, getattr->ga_bmval,
2038 resp->rqstp, 0);
2039 if (!nfserr)
2040 resp->p += buflen;
2041 return nfserr;
2042 }
2043
2044 static __be32
2045 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2046 {
2047 struct svc_fh *fhp = *fhpp;
2048 unsigned int len;
2049 ENCODE_HEAD;
2050
2051 if (!nfserr) {
2052 len = fhp->fh_handle.fh_size;
2053 RESERVE_SPACE(len + 4);
2054 WRITE32(len);
2055 WRITEMEM(&fhp->fh_handle.fh_base, len);
2056 ADJUST_ARGS();
2057 }
2058 return nfserr;
2059 }
2060
2061 /*
2062 * Including all fields other than the name, a LOCK4denied structure requires
2063 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2064 */
2065 static void
2066 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2067 {
2068 ENCODE_HEAD;
2069
2070 RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2071 WRITE64(ld->ld_start);
2072 WRITE64(ld->ld_length);
2073 WRITE32(ld->ld_type);
2074 if (ld->ld_sop) {
2075 WRITEMEM(&ld->ld_clientid, 8);
2076 WRITE32(ld->ld_sop->so_owner.len);
2077 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2078 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2079 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
2080 WRITE64((u64)0); /* clientid */
2081 WRITE32(0); /* length of owner name */
2082 }
2083 ADJUST_ARGS();
2084 }
2085
2086 static __be32
2087 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2088 {
2089 ENCODE_SEQID_OP_HEAD;
2090
2091 if (!nfserr) {
2092 RESERVE_SPACE(4 + sizeof(stateid_t));
2093 WRITE32(lock->lk_resp_stateid.si_generation);
2094 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2095 ADJUST_ARGS();
2096 } else if (nfserr == nfserr_denied)
2097 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2098
2099 ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2100 return nfserr;
2101 }
2102
2103 static __be32
2104 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2105 {
2106 if (nfserr == nfserr_denied)
2107 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2108 return nfserr;
2109 }
2110
2111 static __be32
2112 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2113 {
2114 ENCODE_SEQID_OP_HEAD;
2115
2116 if (!nfserr) {
2117 RESERVE_SPACE(sizeof(stateid_t));
2118 WRITE32(locku->lu_stateid.si_generation);
2119 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
2120 ADJUST_ARGS();
2121 }
2122
2123 ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2124 return nfserr;
2125 }
2126
2127
2128 static __be32
2129 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2130 {
2131 ENCODE_HEAD;
2132
2133 if (!nfserr) {
2134 RESERVE_SPACE(20);
2135 WRITECINFO(link->li_cinfo);
2136 ADJUST_ARGS();
2137 }
2138 return nfserr;
2139 }
2140
2141
2142 static __be32
2143 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2144 {
2145 ENCODE_SEQID_OP_HEAD;
2146
2147 if (nfserr)
2148 goto out;
2149
2150 RESERVE_SPACE(36 + sizeof(stateid_t));
2151 WRITE32(open->op_stateid.si_generation);
2152 WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
2153 WRITECINFO(open->op_cinfo);
2154 WRITE32(open->op_rflags);
2155 WRITE32(2);
2156 WRITE32(open->op_bmval[0]);
2157 WRITE32(open->op_bmval[1]);
2158 WRITE32(open->op_delegate_type);
2159 ADJUST_ARGS();
2160
2161 switch (open->op_delegate_type) {
2162 case NFS4_OPEN_DELEGATE_NONE:
2163 break;
2164 case NFS4_OPEN_DELEGATE_READ:
2165 RESERVE_SPACE(20 + sizeof(stateid_t));
2166 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2167 WRITE32(open->op_recall);
2168
2169 /*
2170 * TODO: ACE's in delegations
2171 */
2172 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2173 WRITE32(0);
2174 WRITE32(0);
2175 WRITE32(0); /* XXX: is NULL principal ok? */
2176 ADJUST_ARGS();
2177 break;
2178 case NFS4_OPEN_DELEGATE_WRITE:
2179 RESERVE_SPACE(32 + sizeof(stateid_t));
2180 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2181 WRITE32(0);
2182
2183 /*
2184 * TODO: space_limit's in delegations
2185 */
2186 WRITE32(NFS4_LIMIT_SIZE);
2187 WRITE32(~(u32)0);
2188 WRITE32(~(u32)0);
2189
2190 /*
2191 * TODO: ACE's in delegations
2192 */
2193 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2194 WRITE32(0);
2195 WRITE32(0);
2196 WRITE32(0); /* XXX: is NULL principal ok? */
2197 ADJUST_ARGS();
2198 break;
2199 default:
2200 BUG();
2201 }
2202 /* XXX save filehandle here */
2203 out:
2204 ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2205 return nfserr;
2206 }
2207
2208 static __be32
2209 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2210 {
2211 ENCODE_SEQID_OP_HEAD;
2212
2213 if (!nfserr) {
2214 RESERVE_SPACE(sizeof(stateid_t));
2215 WRITE32(oc->oc_resp_stateid.si_generation);
2216 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2217 ADJUST_ARGS();
2218 }
2219
2220 ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2221 return nfserr;
2222 }
2223
2224 static __be32
2225 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2226 {
2227 ENCODE_SEQID_OP_HEAD;
2228
2229 if (!nfserr) {
2230 RESERVE_SPACE(sizeof(stateid_t));
2231 WRITE32(od->od_stateid.si_generation);
2232 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2233 ADJUST_ARGS();
2234 }
2235
2236 ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2237 return nfserr;
2238 }
2239
2240 static __be32
2241 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2242 struct nfsd4_read *read)
2243 {
2244 u32 eof;
2245 int v, pn;
2246 unsigned long maxcount;
2247 long len;
2248 ENCODE_HEAD;
2249
2250 if (nfserr)
2251 return nfserr;
2252 if (resp->xbuf->page_len)
2253 return nfserr_resource;
2254
2255 RESERVE_SPACE(8); /* eof flag and byte count */
2256
2257 maxcount = svc_max_payload(resp->rqstp);
2258 if (maxcount > read->rd_length)
2259 maxcount = read->rd_length;
2260
2261 len = maxcount;
2262 v = 0;
2263 while (len > 0) {
2264 pn = resp->rqstp->rq_resused++;
2265 resp->rqstp->rq_vec[v].iov_base =
2266 page_address(resp->rqstp->rq_respages[pn]);
2267 resp->rqstp->rq_vec[v].iov_len =
2268 len < PAGE_SIZE ? len : PAGE_SIZE;
2269 v++;
2270 len -= PAGE_SIZE;
2271 }
2272 read->rd_vlen = v;
2273
2274 nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2275 read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2276 &maxcount);
2277
2278 if (nfserr == nfserr_symlink)
2279 nfserr = nfserr_inval;
2280 if (nfserr)
2281 return nfserr;
2282 eof = (read->rd_offset + maxcount >=
2283 read->rd_fhp->fh_dentry->d_inode->i_size);
2284
2285 WRITE32(eof);
2286 WRITE32(maxcount);
2287 ADJUST_ARGS();
2288 resp->xbuf->head[0].iov_len = (char*)p
2289 - (char*)resp->xbuf->head[0].iov_base;
2290 resp->xbuf->page_len = maxcount;
2291
2292 /* Use rest of head for padding and remaining ops: */
2293 resp->xbuf->tail[0].iov_base = p;
2294 resp->xbuf->tail[0].iov_len = 0;
2295 if (maxcount&3) {
2296 RESERVE_SPACE(4);
2297 WRITE32(0);
2298 resp->xbuf->tail[0].iov_base += maxcount&3;
2299 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2300 ADJUST_ARGS();
2301 }
2302 return 0;
2303 }
2304
2305 static __be32
2306 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2307 {
2308 int maxcount;
2309 char *page;
2310 ENCODE_HEAD;
2311
2312 if (nfserr)
2313 return nfserr;
2314 if (resp->xbuf->page_len)
2315 return nfserr_resource;
2316
2317 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2318
2319 maxcount = PAGE_SIZE;
2320 RESERVE_SPACE(4);
2321
2322 /*
2323 * XXX: By default, the ->readlink() VFS op will truncate symlinks
2324 * if they would overflow the buffer. Is this kosher in NFSv4? If
2325 * not, one easy fix is: if ->readlink() precisely fills the buffer,
2326 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2327 */
2328 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2329 if (nfserr == nfserr_isdir)
2330 return nfserr_inval;
2331 if (nfserr)
2332 return nfserr;
2333
2334 WRITE32(maxcount);
2335 ADJUST_ARGS();
2336 resp->xbuf->head[0].iov_len = (char*)p
2337 - (char*)resp->xbuf->head[0].iov_base;
2338 resp->xbuf->page_len = maxcount;
2339
2340 /* Use rest of head for padding and remaining ops: */
2341 resp->xbuf->tail[0].iov_base = p;
2342 resp->xbuf->tail[0].iov_len = 0;
2343 if (maxcount&3) {
2344 RESERVE_SPACE(4);
2345 WRITE32(0);
2346 resp->xbuf->tail[0].iov_base += maxcount&3;
2347 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2348 ADJUST_ARGS();
2349 }
2350 return 0;
2351 }
2352
2353 static __be32
2354 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2355 {
2356 int maxcount;
2357 loff_t offset;
2358 __be32 *page, *savep, *tailbase;
2359 ENCODE_HEAD;
2360
2361 if (nfserr)
2362 return nfserr;
2363 if (resp->xbuf->page_len)
2364 return nfserr_resource;
2365
2366 RESERVE_SPACE(8); /* verifier */
2367 savep = p;
2368
2369 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2370 WRITE32(0);
2371 WRITE32(0);
2372 ADJUST_ARGS();
2373 resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2374 tailbase = p;
2375
2376 maxcount = PAGE_SIZE;
2377 if (maxcount > readdir->rd_maxcount)
2378 maxcount = readdir->rd_maxcount;
2379
2380 /*
2381 * Convert from bytes to words, account for the two words already
2382 * written, make sure to leave two words at the end for the next
2383 * pointer and eof field.
2384 */
2385 maxcount = (maxcount >> 2) - 4;
2386 if (maxcount < 0) {
2387 nfserr = nfserr_toosmall;
2388 goto err_no_verf;
2389 }
2390
2391 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2392 readdir->common.err = 0;
2393 readdir->buflen = maxcount;
2394 readdir->buffer = page;
2395 readdir->offset = NULL;
2396
2397 offset = readdir->rd_cookie;
2398 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2399 &offset,
2400 &readdir->common, nfsd4_encode_dirent);
2401 if (nfserr == nfs_ok &&
2402 readdir->common.err == nfserr_toosmall &&
2403 readdir->buffer == page)
2404 nfserr = nfserr_toosmall;
2405 if (nfserr == nfserr_symlink)
2406 nfserr = nfserr_notdir;
2407 if (nfserr)
2408 goto err_no_verf;
2409
2410 if (readdir->offset)
2411 xdr_encode_hyper(readdir->offset, offset);
2412
2413 p = readdir->buffer;
2414 *p++ = 0; /* no more entries */
2415 *p++ = htonl(readdir->common.err == nfserr_eof);
2416 resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2417 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2418
2419 /* Use rest of head for padding and remaining ops: */
2420 resp->xbuf->tail[0].iov_base = tailbase;
2421 resp->xbuf->tail[0].iov_len = 0;
2422 resp->p = resp->xbuf->tail[0].iov_base;
2423 resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2424
2425 return 0;
2426 err_no_verf:
2427 p = savep;
2428 ADJUST_ARGS();
2429 return nfserr;
2430 }
2431
2432 static __be32
2433 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2434 {
2435 ENCODE_HEAD;
2436
2437 if (!nfserr) {
2438 RESERVE_SPACE(20);
2439 WRITECINFO(remove->rm_cinfo);
2440 ADJUST_ARGS();
2441 }
2442 return nfserr;
2443 }
2444
2445 static __be32
2446 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2447 {
2448 ENCODE_HEAD;
2449
2450 if (!nfserr) {
2451 RESERVE_SPACE(40);
2452 WRITECINFO(rename->rn_sinfo);
2453 WRITECINFO(rename->rn_tinfo);
2454 ADJUST_ARGS();
2455 }
2456 return nfserr;
2457 }
2458
2459 static __be32
2460 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2461 struct nfsd4_secinfo *secinfo)
2462 {
2463 int i = 0;
2464 struct svc_export *exp = secinfo->si_exp;
2465 u32 nflavs;
2466 struct exp_flavor_info *flavs;
2467 struct exp_flavor_info def_flavs[2];
2468 ENCODE_HEAD;
2469
2470 if (nfserr)
2471 goto out;
2472 if (exp->ex_nflavors) {
2473 flavs = exp->ex_flavors;
2474 nflavs = exp->ex_nflavors;
2475 } else { /* Handling of some defaults in absence of real secinfo: */
2476 flavs = def_flavs;
2477 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2478 nflavs = 2;
2479 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2480 flavs[1].pseudoflavor = RPC_AUTH_NULL;
2481 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2482 nflavs = 1;
2483 flavs[0].pseudoflavor
2484 = svcauth_gss_flavor(exp->ex_client);
2485 } else {
2486 nflavs = 1;
2487 flavs[0].pseudoflavor
2488 = exp->ex_client->flavour->flavour;
2489 }
2490 }
2491
2492 RESERVE_SPACE(4);
2493 WRITE32(nflavs);
2494 ADJUST_ARGS();
2495 for (i = 0; i < nflavs; i++) {
2496 u32 flav = flavs[i].pseudoflavor;
2497 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2498
2499 if (gm) {
2500 RESERVE_SPACE(4);
2501 WRITE32(RPC_AUTH_GSS);
2502 ADJUST_ARGS();
2503 RESERVE_SPACE(4 + gm->gm_oid.len);
2504 WRITE32(gm->gm_oid.len);
2505 WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2506 ADJUST_ARGS();
2507 RESERVE_SPACE(4);
2508 WRITE32(0); /* qop */
2509 ADJUST_ARGS();
2510 RESERVE_SPACE(4);
2511 WRITE32(gss_pseudoflavor_to_service(gm, flav));
2512 ADJUST_ARGS();
2513 gss_mech_put(gm);
2514 } else {
2515 RESERVE_SPACE(4);
2516 WRITE32(flav);
2517 ADJUST_ARGS();
2518 }
2519 }
2520 out:
2521 if (exp)
2522 exp_put(exp);
2523 return nfserr;
2524 }
2525
2526 /*
2527 * The SETATTR encode routine is special -- it always encodes a bitmap,
2528 * regardless of the error status.
2529 */
2530 static __be32
2531 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2532 {
2533 ENCODE_HEAD;
2534
2535 RESERVE_SPACE(12);
2536 if (nfserr) {
2537 WRITE32(2);
2538 WRITE32(0);
2539 WRITE32(0);
2540 }
2541 else {
2542 WRITE32(2);
2543 WRITE32(setattr->sa_bmval[0]);
2544 WRITE32(setattr->sa_bmval[1]);
2545 }
2546 ADJUST_ARGS();
2547 return nfserr;
2548 }
2549
2550 static __be32
2551 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2552 {
2553 ENCODE_HEAD;
2554
2555 if (!nfserr) {
2556 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2557 WRITEMEM(&scd->se_clientid, 8);
2558 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2559 ADJUST_ARGS();
2560 }
2561 else if (nfserr == nfserr_clid_inuse) {
2562 RESERVE_SPACE(8);
2563 WRITE32(0);
2564 WRITE32(0);
2565 ADJUST_ARGS();
2566 }
2567 return nfserr;
2568 }
2569
2570 static __be32
2571 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2572 {
2573 ENCODE_HEAD;
2574
2575 if (!nfserr) {
2576 RESERVE_SPACE(16);
2577 WRITE32(write->wr_bytes_written);
2578 WRITE32(write->wr_how_written);
2579 WRITEMEM(write->wr_verifier.data, 8);
2580 ADJUST_ARGS();
2581 }
2582 return nfserr;
2583 }
2584
2585 static __be32
2586 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
2587 {
2588 return nfserr;
2589 }
2590
2591 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
2592
2593 static nfsd4_enc nfsd4_enc_ops[] = {
2594 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
2595 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
2596 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
2597 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
2598 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
2599 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
2600 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
2601 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
2602 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
2603 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
2604 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
2605 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
2606 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
2607 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
2608 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
2609 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
2610 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
2611 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
2612 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
2613 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
2614 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
2615 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
2616 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
2617 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
2618 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
2619 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
2620 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
2621 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
2622 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
2623 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
2624 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
2625 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
2626 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
2627 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
2628 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
2629 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
2630 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
2631 };
2632
2633 void
2634 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2635 {
2636 __be32 *statp;
2637 ENCODE_HEAD;
2638
2639 RESERVE_SPACE(8);
2640 WRITE32(op->opnum);
2641 statp = p++; /* to be backfilled at the end */
2642 ADJUST_ARGS();
2643
2644 if (op->opnum == OP_ILLEGAL)
2645 goto status;
2646 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
2647 !nfsd4_enc_ops[op->opnum]);
2648 op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
2649 status:
2650 /*
2651 * Note: We write the status directly, instead of using WRITE32(),
2652 * since it is already in network byte order.
2653 */
2654 *statp = op->status;
2655 }
2656
2657 /*
2658 * Encode the reply stored in the stateowner reply cache
2659 *
2660 * XDR note: do not encode rp->rp_buflen: the buffer contains the
2661 * previously sent already encoded operation.
2662 *
2663 * called with nfs4_lock_state() held
2664 */
2665 void
2666 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2667 {
2668 ENCODE_HEAD;
2669 struct nfs4_replay *rp = op->replay;
2670
2671 BUG_ON(!rp);
2672
2673 RESERVE_SPACE(8);
2674 WRITE32(op->opnum);
2675 *p++ = rp->rp_status; /* already xdr'ed */
2676 ADJUST_ARGS();
2677
2678 RESERVE_SPACE(rp->rp_buflen);
2679 WRITEMEM(rp->rp_buf, rp->rp_buflen);
2680 ADJUST_ARGS();
2681 }
2682
2683 /*
2684 * END OF "GENERIC" ENCODE ROUTINES.
2685 */
2686
2687 int
2688 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2689 {
2690 return xdr_ressize_check(rqstp, p);
2691 }
2692
2693 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2694 {
2695 if (args->ops != args->iops) {
2696 kfree(args->ops);
2697 args->ops = args->iops;
2698 }
2699 kfree(args->tmpp);
2700 args->tmpp = NULL;
2701 while (args->to_free) {
2702 struct tmpbuf *tb = args->to_free;
2703 args->to_free = tb->next;
2704 tb->release(tb->buf);
2705 kfree(tb);
2706 }
2707 }
2708
2709 int
2710 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2711 {
2712 __be32 status;
2713
2714 args->p = p;
2715 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2716 args->pagelist = rqstp->rq_arg.pages;
2717 args->pagelen = rqstp->rq_arg.page_len;
2718 args->tmpp = NULL;
2719 args->to_free = NULL;
2720 args->ops = args->iops;
2721 args->rqstp = rqstp;
2722
2723 status = nfsd4_decode_compound(args);
2724 if (status) {
2725 nfsd4_release_compoundargs(args);
2726 }
2727 return !status;
2728 }
2729
2730 int
2731 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2732 {
2733 /*
2734 * All that remains is to write the tag and operation count...
2735 */
2736 struct kvec *iov;
2737 p = resp->tagp;
2738 *p++ = htonl(resp->taglen);
2739 memcpy(p, resp->tag, resp->taglen);
2740 p += XDR_QUADLEN(resp->taglen);
2741 *p++ = htonl(resp->opcnt);
2742
2743 if (rqstp->rq_res.page_len)
2744 iov = &rqstp->rq_res.tail[0];
2745 else
2746 iov = &rqstp->rq_res.head[0];
2747 iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2748 BUG_ON(iov->iov_len > PAGE_SIZE);
2749 return 1;
2750 }
2751
2752 /*
2753 * Local variables:
2754 * c-basic-offset: 8
2755 * End:
2756 */
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