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rt2x00: Optimize get_duration / get_duration_res
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfsd / nfs4xdr.c
blobafcdf4b76843a7219e50c66d3d3dba4dde5ae514
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 = p + (argp->pagelen>>2);
183 argp->pagelen = 0;
184 } else {
185 argp->end = 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 ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
339 goto out_nfserr;
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 ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
350 goto out_nfserr;
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_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
417 {
418 DECODE_HEAD;
419
420 READ_BUF(sizeof(stateid_t));
421 READ32(sid->si_generation);
422 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
423
424 DECODE_TAIL;
425 }
426
427 static __be32
428 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
429 {
430 DECODE_HEAD;
431
432 READ_BUF(4);
433 READ32(access->ac_req_access);
434
435 DECODE_TAIL;
436 }
437
438 static __be32
439 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
440 {
441 DECODE_HEAD;
442
443 close->cl_stateowner = NULL;
444 READ_BUF(4);
445 READ32(close->cl_seqid);
446 return nfsd4_decode_stateid(argp, &close->cl_stateid);
447
448 DECODE_TAIL;
449 }
450
451
452 static __be32
453 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
454 {
455 DECODE_HEAD;
456
457 READ_BUF(12);
458 READ64(commit->co_offset);
459 READ32(commit->co_count);
460
461 DECODE_TAIL;
462 }
463
464 static __be32
465 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
466 {
467 DECODE_HEAD;
468
469 READ_BUF(4);
470 READ32(create->cr_type);
471 switch (create->cr_type) {
472 case NF4LNK:
473 READ_BUF(4);
474 READ32(create->cr_linklen);
475 READ_BUF(create->cr_linklen);
476 SAVEMEM(create->cr_linkname, create->cr_linklen);
477 break;
478 case NF4BLK:
479 case NF4CHR:
480 READ_BUF(8);
481 READ32(create->cr_specdata1);
482 READ32(create->cr_specdata2);
483 break;
484 case NF4SOCK:
485 case NF4FIFO:
486 case NF4DIR:
487 default:
488 break;
489 }
490
491 READ_BUF(4);
492 READ32(create->cr_namelen);
493 READ_BUF(create->cr_namelen);
494 SAVEMEM(create->cr_name, create->cr_namelen);
495 if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
496 return status;
497
498 if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
499 goto out;
500
501 DECODE_TAIL;
502 }
503
504 static inline __be32
505 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
506 {
507 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
508 }
509
510 static inline __be32
511 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
512 {
513 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
514 }
515
516 static __be32
517 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
518 {
519 DECODE_HEAD;
520
521 READ_BUF(4);
522 READ32(link->li_namelen);
523 READ_BUF(link->li_namelen);
524 SAVEMEM(link->li_name, link->li_namelen);
525 if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
526 return status;
527
528 DECODE_TAIL;
529 }
530
531 static __be32
532 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
533 {
534 DECODE_HEAD;
535
536 lock->lk_replay_owner = NULL;
537 /*
538 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
539 */
540 READ_BUF(28);
541 READ32(lock->lk_type);
542 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
543 goto xdr_error;
544 READ32(lock->lk_reclaim);
545 READ64(lock->lk_offset);
546 READ64(lock->lk_length);
547 READ32(lock->lk_is_new);
548
549 if (lock->lk_is_new) {
550 READ_BUF(4);
551 READ32(lock->lk_new_open_seqid);
552 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
553 if (status)
554 return status;
555 READ_BUF(8 + sizeof(clientid_t));
556 READ32(lock->lk_new_lock_seqid);
557 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
558 READ32(lock->lk_new_owner.len);
559 READ_BUF(lock->lk_new_owner.len);
560 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
561 } else {
562 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
563 if (status)
564 return status;
565 READ_BUF(4);
566 READ32(lock->lk_old_lock_seqid);
567 }
568
569 DECODE_TAIL;
570 }
571
572 static __be32
573 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
574 {
575 DECODE_HEAD;
576
577 READ_BUF(32);
578 READ32(lockt->lt_type);
579 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
580 goto xdr_error;
581 READ64(lockt->lt_offset);
582 READ64(lockt->lt_length);
583 COPYMEM(&lockt->lt_clientid, 8);
584 READ32(lockt->lt_owner.len);
585 READ_BUF(lockt->lt_owner.len);
586 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
587
588 DECODE_TAIL;
589 }
590
591 static __be32
592 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
593 {
594 DECODE_HEAD;
595
596 locku->lu_stateowner = NULL;
597 READ_BUF(8);
598 READ32(locku->lu_type);
599 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
600 goto xdr_error;
601 READ32(locku->lu_seqid);
602 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
603 if (status)
604 return status;
605 READ_BUF(16);
606 READ64(locku->lu_offset);
607 READ64(locku->lu_length);
608
609 DECODE_TAIL;
610 }
611
612 static __be32
613 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
614 {
615 DECODE_HEAD;
616
617 READ_BUF(4);
618 READ32(lookup->lo_len);
619 READ_BUF(lookup->lo_len);
620 SAVEMEM(lookup->lo_name, lookup->lo_len);
621 if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
622 return status;
623
624 DECODE_TAIL;
625 }
626
627 static __be32
628 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
629 {
630 DECODE_HEAD;
631
632 memset(open->op_bmval, 0, sizeof(open->op_bmval));
633 open->op_iattr.ia_valid = 0;
634 open->op_stateowner = NULL;
635
636 /* seqid, share_access, share_deny, clientid, ownerlen */
637 READ_BUF(16 + sizeof(clientid_t));
638 READ32(open->op_seqid);
639 READ32(open->op_share_access);
640 READ32(open->op_share_deny);
641 COPYMEM(&open->op_clientid, sizeof(clientid_t));
642 READ32(open->op_owner.len);
643
644 /* owner, open_flag */
645 READ_BUF(open->op_owner.len + 4);
646 SAVEMEM(open->op_owner.data, open->op_owner.len);
647 READ32(open->op_create);
648 switch (open->op_create) {
649 case NFS4_OPEN_NOCREATE:
650 break;
651 case NFS4_OPEN_CREATE:
652 READ_BUF(4);
653 READ32(open->op_createmode);
654 switch (open->op_createmode) {
655 case NFS4_CREATE_UNCHECKED:
656 case NFS4_CREATE_GUARDED:
657 if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
658 goto out;
659 break;
660 case NFS4_CREATE_EXCLUSIVE:
661 READ_BUF(8);
662 COPYMEM(open->op_verf.data, 8);
663 break;
664 default:
665 goto xdr_error;
666 }
667 break;
668 default:
669 goto xdr_error;
670 }
671
672 /* open_claim */
673 READ_BUF(4);
674 READ32(open->op_claim_type);
675 switch (open->op_claim_type) {
676 case NFS4_OPEN_CLAIM_NULL:
677 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
678 READ_BUF(4);
679 READ32(open->op_fname.len);
680 READ_BUF(open->op_fname.len);
681 SAVEMEM(open->op_fname.data, open->op_fname.len);
682 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
683 return status;
684 break;
685 case NFS4_OPEN_CLAIM_PREVIOUS:
686 READ_BUF(4);
687 READ32(open->op_delegate_type);
688 break;
689 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
690 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
691 if (status)
692 return status;
693 READ_BUF(4);
694 READ32(open->op_fname.len);
695 READ_BUF(open->op_fname.len);
696 SAVEMEM(open->op_fname.data, open->op_fname.len);
697 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
698 return status;
699 break;
700 default:
701 goto xdr_error;
702 }
703
704 DECODE_TAIL;
705 }
706
707 static __be32
708 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
709 {
710 DECODE_HEAD;
711
712 open_conf->oc_stateowner = NULL;
713 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
714 if (status)
715 return status;
716 READ_BUF(4);
717 READ32(open_conf->oc_seqid);
718
719 DECODE_TAIL;
720 }
721
722 static __be32
723 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
724 {
725 DECODE_HEAD;
726
727 open_down->od_stateowner = NULL;
728 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
729 if (status)
730 return status;
731 READ_BUF(12);
732 READ32(open_down->od_seqid);
733 READ32(open_down->od_share_access);
734 READ32(open_down->od_share_deny);
735
736 DECODE_TAIL;
737 }
738
739 static __be32
740 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
741 {
742 DECODE_HEAD;
743
744 READ_BUF(4);
745 READ32(putfh->pf_fhlen);
746 if (putfh->pf_fhlen > NFS4_FHSIZE)
747 goto xdr_error;
748 READ_BUF(putfh->pf_fhlen);
749 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
750
751 DECODE_TAIL;
752 }
753
754 static __be32
755 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
756 {
757 DECODE_HEAD;
758
759 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
760 if (status)
761 return status;
762 READ_BUF(12);
763 READ64(read->rd_offset);
764 READ32(read->rd_length);
765
766 DECODE_TAIL;
767 }
768
769 static __be32
770 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
771 {
772 DECODE_HEAD;
773
774 READ_BUF(24);
775 READ64(readdir->rd_cookie);
776 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
777 READ32(readdir->rd_dircount); /* just in case you needed a useless field... */
778 READ32(readdir->rd_maxcount);
779 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
780 goto out;
781
782 DECODE_TAIL;
783 }
784
785 static __be32
786 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
787 {
788 DECODE_HEAD;
789
790 READ_BUF(4);
791 READ32(remove->rm_namelen);
792 READ_BUF(remove->rm_namelen);
793 SAVEMEM(remove->rm_name, remove->rm_namelen);
794 if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
795 return status;
796
797 DECODE_TAIL;
798 }
799
800 static __be32
801 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
802 {
803 DECODE_HEAD;
804
805 READ_BUF(4);
806 READ32(rename->rn_snamelen);
807 READ_BUF(rename->rn_snamelen + 4);
808 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
809 READ32(rename->rn_tnamelen);
810 READ_BUF(rename->rn_tnamelen);
811 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
812 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
813 return status;
814 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
815 return status;
816
817 DECODE_TAIL;
818 }
819
820 static __be32
821 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
822 {
823 DECODE_HEAD;
824
825 READ_BUF(sizeof(clientid_t));
826 COPYMEM(clientid, sizeof(clientid_t));
827
828 DECODE_TAIL;
829 }
830
831 static __be32
832 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
833 struct nfsd4_secinfo *secinfo)
834 {
835 DECODE_HEAD;
836
837 READ_BUF(4);
838 READ32(secinfo->si_namelen);
839 READ_BUF(secinfo->si_namelen);
840 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
841 status = check_filename(secinfo->si_name, secinfo->si_namelen,
842 nfserr_noent);
843 if (status)
844 return status;
845 DECODE_TAIL;
846 }
847
848 static __be32
849 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
850 {
851 __be32 status;
852
853 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
854 if (status)
855 return status;
856 return nfsd4_decode_fattr(argp, setattr->sa_bmval,
857 &setattr->sa_iattr, &setattr->sa_acl);
858 }
859
860 static __be32
861 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
862 {
863 DECODE_HEAD;
864
865 READ_BUF(12);
866 COPYMEM(setclientid->se_verf.data, 8);
867 READ32(setclientid->se_namelen);
868
869 READ_BUF(setclientid->se_namelen + 8);
870 SAVEMEM(setclientid->se_name, setclientid->se_namelen);
871 READ32(setclientid->se_callback_prog);
872 READ32(setclientid->se_callback_netid_len);
873
874 READ_BUF(setclientid->se_callback_netid_len + 4);
875 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
876 READ32(setclientid->se_callback_addr_len);
877
878 READ_BUF(setclientid->se_callback_addr_len + 4);
879 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
880 READ32(setclientid->se_callback_ident);
881
882 DECODE_TAIL;
883 }
884
885 static __be32
886 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
887 {
888 DECODE_HEAD;
889
890 READ_BUF(8 + sizeof(nfs4_verifier));
891 COPYMEM(&scd_c->sc_clientid, 8);
892 COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
893
894 DECODE_TAIL;
895 }
896
897 /* Also used for NVERIFY */
898 static __be32
899 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
900 {
901 #if 0
902 struct nfsd4_compoundargs save = {
903 .p = argp->p,
904 .end = argp->end,
905 .rqstp = argp->rqstp,
906 };
907 u32 ve_bmval[2];
908 struct iattr ve_iattr; /* request */
909 struct nfs4_acl *ve_acl; /* request */
910 #endif
911 DECODE_HEAD;
912
913 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
914 goto out;
915
916 /* For convenience's sake, we compare raw xdr'd attributes in
917 * nfsd4_proc_verify; however we still decode here just to return
918 * correct error in case of bad xdr. */
919 #if 0
920 status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
921 if (status == nfserr_inval) {
922 status = nfserrno(status);
923 goto out;
924 }
925 #endif
926 READ_BUF(4);
927 READ32(verify->ve_attrlen);
928 READ_BUF(verify->ve_attrlen);
929 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
930
931 DECODE_TAIL;
932 }
933
934 static __be32
935 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
936 {
937 int avail;
938 int v;
939 int len;
940 DECODE_HEAD;
941
942 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
943 if (status)
944 return status;
945 READ_BUF(16);
946 READ64(write->wr_offset);
947 READ32(write->wr_stable_how);
948 if (write->wr_stable_how > 2)
949 goto xdr_error;
950 READ32(write->wr_buflen);
951
952 /* Sorry .. no magic macros for this.. *
953 * READ_BUF(write->wr_buflen);
954 * SAVEMEM(write->wr_buf, write->wr_buflen);
955 */
956 avail = (char*)argp->end - (char*)argp->p;
957 if (avail + argp->pagelen < write->wr_buflen) {
958 dprintk("NFSD: xdr error (%s:%d)\n",
959 __FILE__, __LINE__);
960 goto xdr_error;
961 }
962 argp->rqstp->rq_vec[0].iov_base = p;
963 argp->rqstp->rq_vec[0].iov_len = avail;
964 v = 0;
965 len = write->wr_buflen;
966 while (len > argp->rqstp->rq_vec[v].iov_len) {
967 len -= argp->rqstp->rq_vec[v].iov_len;
968 v++;
969 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
970 argp->pagelist++;
971 if (argp->pagelen >= PAGE_SIZE) {
972 argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
973 argp->pagelen -= PAGE_SIZE;
974 } else {
975 argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
976 argp->pagelen -= len;
977 }
978 }
979 argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
980 argp->p = (__be32*) (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
981 argp->rqstp->rq_vec[v].iov_len = len;
982 write->wr_vlen = v+1;
983
984 DECODE_TAIL;
985 }
986
987 static __be32
988 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
989 {
990 DECODE_HEAD;
991
992 READ_BUF(12);
993 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
994 READ32(rlockowner->rl_owner.len);
995 READ_BUF(rlockowner->rl_owner.len);
996 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
997
998 DECODE_TAIL;
999 }
1000
1001 static __be32
1002 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1003 {
1004 return nfs_ok;
1005 }
1006
1007 static __be32
1008 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1009 {
1010 return nfserr_opnotsupp;
1011 }
1012
1013 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1014
1015 static nfsd4_dec nfsd4_dec_ops[] = {
1016 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1017 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1018 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1019 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1020 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1021 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1022 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1023 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1024 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1025 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1026 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1027 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1028 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1029 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1030 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1031 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1032 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1033 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1034 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1035 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1036 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_notsupp,
1037 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1038 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1039 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1040 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1041 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1042 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1043 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1044 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1045 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1046 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1047 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1048 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1049 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1050 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1051 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1052 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1053 };
1054
1055 struct nfsd4_minorversion_ops {
1056 nfsd4_dec *decoders;
1057 int nops;
1058 };
1059
1060 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1061 [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1062 };
1063
1064 static __be32
1065 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1066 {
1067 DECODE_HEAD;
1068 struct nfsd4_op *op;
1069 struct nfsd4_minorversion_ops *ops;
1070 int i;
1071
1072 /*
1073 * XXX: According to spec, we should check the tag
1074 * for UTF-8 compliance. I'm postponing this for
1075 * now because it seems that some clients do use
1076 * binary tags.
1077 */
1078 READ_BUF(4);
1079 READ32(argp->taglen);
1080 READ_BUF(argp->taglen + 8);
1081 SAVEMEM(argp->tag, argp->taglen);
1082 READ32(argp->minorversion);
1083 READ32(argp->opcnt);
1084
1085 if (argp->taglen > NFSD4_MAX_TAGLEN)
1086 goto xdr_error;
1087 if (argp->opcnt > 100)
1088 goto xdr_error;
1089
1090 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1091 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1092 if (!argp->ops) {
1093 argp->ops = argp->iops;
1094 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1095 goto xdr_error;
1096 }
1097 }
1098
1099 if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1100 argp->opcnt = 0;
1101
1102 ops = &nfsd4_minorversion[argp->minorversion];
1103 for (i = 0; i < argp->opcnt; i++) {
1104 op = &argp->ops[i];
1105 op->replay = NULL;
1106
1107 /*
1108 * We can't use READ_BUF() here because we need to handle
1109 * a missing opcode as an OP_WRITE + 1. So we need to check
1110 * to see if we're truly at the end of our buffer or if there
1111 * is another page we need to flip to.
1112 */
1113
1114 if (argp->p == argp->end) {
1115 if (argp->pagelen < 4) {
1116 /* There isn't an opcode still on the wire */
1117 op->opnum = OP_WRITE + 1;
1118 op->status = nfserr_bad_xdr;
1119 argp->opcnt = i+1;
1120 break;
1121 }
1122
1123 /*
1124 * False alarm. We just hit a page boundary, but there
1125 * is still data available. Move pointer across page
1126 * boundary. *snip from READ_BUF*
1127 */
1128 argp->p = page_address(argp->pagelist[0]);
1129 argp->pagelist++;
1130 if (argp->pagelen < PAGE_SIZE) {
1131 argp->end = p + (argp->pagelen>>2);
1132 argp->pagelen = 0;
1133 } else {
1134 argp->end = p + (PAGE_SIZE>>2);
1135 argp->pagelen -= PAGE_SIZE;
1136 }
1137 }
1138 op->opnum = ntohl(*argp->p++);
1139
1140 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1141 op->status = ops->decoders[op->opnum](argp, &op->u);
1142 else {
1143 op->opnum = OP_ILLEGAL;
1144 op->status = nfserr_op_illegal;
1145 }
1146
1147 if (op->status) {
1148 argp->opcnt = i+1;
1149 break;
1150 }
1151 }
1152
1153 DECODE_TAIL;
1154 }
1155 /*
1156 * END OF "GENERIC" DECODE ROUTINES.
1157 */
1158
1159 /*
1160 * START OF "GENERIC" ENCODE ROUTINES.
1161 * These may look a little ugly since they are imported from a "generic"
1162 * set of XDR encode/decode routines which are intended to be shared by
1163 * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1164 *
1165 * If the pain of reading these is too great, it should be a straightforward
1166 * task to translate them into Linux-specific versions which are more
1167 * consistent with the style used in NFSv2/v3...
1168 */
1169 #define ENCODE_HEAD __be32 *p
1170
1171 #define WRITE32(n) *p++ = htonl(n)
1172 #define WRITE64(n) do { \
1173 *p++ = htonl((u32)((n) >> 32)); \
1174 *p++ = htonl((u32)(n)); \
1175 } while (0)
1176 #define WRITEMEM(ptr,nbytes) do { if (nbytes > 0) { \
1177 *(p + XDR_QUADLEN(nbytes) -1) = 0; \
1178 memcpy(p, ptr, nbytes); \
1179 p += XDR_QUADLEN(nbytes); \
1180 }} while (0)
1181 #define WRITECINFO(c) do { \
1182 *p++ = htonl(c.atomic); \
1183 *p++ = htonl(c.before_ctime_sec); \
1184 *p++ = htonl(c.before_ctime_nsec); \
1185 *p++ = htonl(c.after_ctime_sec); \
1186 *p++ = htonl(c.after_ctime_nsec); \
1187 } while (0)
1188
1189 #define RESERVE_SPACE(nbytes) do { \
1190 p = resp->p; \
1191 BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end); \
1192 } while (0)
1193 #define ADJUST_ARGS() resp->p = p
1194
1195 /*
1196 * Header routine to setup seqid operation replay cache
1197 */
1198 #define ENCODE_SEQID_OP_HEAD \
1199 __be32 *save; \
1200 \
1201 save = resp->p;
1202
1203 /*
1204 * Routine for encoding the result of a "seqid-mutating" NFSv4 operation. This
1205 * is where sequence id's are incremented, and the replay cache is filled.
1206 * Note that we increment sequence id's here, at the last moment, so we're sure
1207 * we know whether the error to be returned is a sequence id mutating error.
1208 */
1209
1210 #define ENCODE_SEQID_OP_TAIL(stateowner) do { \
1211 if (seqid_mutating_err(nfserr) && stateowner) { \
1212 stateowner->so_seqid++; \
1213 stateowner->so_replay.rp_status = nfserr; \
1214 stateowner->so_replay.rp_buflen = \
1215 (((char *)(resp)->p - (char *)save)); \
1216 memcpy(stateowner->so_replay.rp_buf, save, \
1217 stateowner->so_replay.rp_buflen); \
1218 } } while (0);
1219
1220 /* Encode as an array of strings the string given with components
1221 * seperated @sep.
1222 */
1223 static __be32 nfsd4_encode_components(char sep, char *components,
1224 __be32 **pp, int *buflen)
1225 {
1226 __be32 *p = *pp;
1227 __be32 *countp = p;
1228 int strlen, count=0;
1229 char *str, *end;
1230
1231 dprintk("nfsd4_encode_components(%s)\n", components);
1232 if ((*buflen -= 4) < 0)
1233 return nfserr_resource;
1234 WRITE32(0); /* We will fill this in with @count later */
1235 end = str = components;
1236 while (*end) {
1237 for (; *end && (*end != sep); end++)
1238 ; /* Point to end of component */
1239 strlen = end - str;
1240 if (strlen) {
1241 if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1242 return nfserr_resource;
1243 WRITE32(strlen);
1244 WRITEMEM(str, strlen);
1245 count++;
1246 }
1247 else
1248 end++;
1249 str = end;
1250 }
1251 *pp = p;
1252 p = countp;
1253 WRITE32(count);
1254 return 0;
1255 }
1256
1257 /*
1258 * encode a location element of a fs_locations structure
1259 */
1260 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1261 __be32 **pp, int *buflen)
1262 {
1263 __be32 status;
1264 __be32 *p = *pp;
1265
1266 status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1267 if (status)
1268 return status;
1269 status = nfsd4_encode_components('/', location->path, &p, buflen);
1270 if (status)
1271 return status;
1272 *pp = p;
1273 return 0;
1274 }
1275
1276 /*
1277 * Return the path to an export point in the pseudo filesystem namespace
1278 * Returned string is safe to use as long as the caller holds a reference
1279 * to @exp.
1280 */
1281 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1282 {
1283 struct svc_fh tmp_fh;
1284 char *path, *rootpath;
1285
1286 fh_init(&tmp_fh, NFS4_FHSIZE);
1287 *stat = exp_pseudoroot(rqstp, &tmp_fh);
1288 if (*stat)
1289 return NULL;
1290 rootpath = tmp_fh.fh_export->ex_pathname;
1291
1292 path = exp->ex_pathname;
1293
1294 if (strncmp(path, rootpath, strlen(rootpath))) {
1295 dprintk("nfsd: fs_locations failed;"
1296 "%s is not contained in %s\n", path, rootpath);
1297 *stat = nfserr_notsupp;
1298 return NULL;
1299 }
1300
1301 return path + strlen(rootpath);
1302 }
1303
1304 /*
1305 * encode a fs_locations structure
1306 */
1307 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1308 struct svc_export *exp,
1309 __be32 **pp, int *buflen)
1310 {
1311 __be32 status;
1312 int i;
1313 __be32 *p = *pp;
1314 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1315 char *root = nfsd4_path(rqstp, exp, &status);
1316
1317 if (status)
1318 return status;
1319 status = nfsd4_encode_components('/', root, &p, buflen);
1320 if (status)
1321 return status;
1322 if ((*buflen -= 4) < 0)
1323 return nfserr_resource;
1324 WRITE32(fslocs->locations_count);
1325 for (i=0; i<fslocs->locations_count; i++) {
1326 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1327 &p, buflen);
1328 if (status)
1329 return status;
1330 }
1331 *pp = p;
1332 return 0;
1333 }
1334
1335 static u32 nfs4_ftypes[16] = {
1336 NF4BAD, NF4FIFO, NF4CHR, NF4BAD,
1337 NF4DIR, NF4BAD, NF4BLK, NF4BAD,
1338 NF4REG, NF4BAD, NF4LNK, NF4BAD,
1339 NF4SOCK, NF4BAD, NF4LNK, NF4BAD,
1340 };
1341
1342 static __be32
1343 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1344 __be32 **p, int *buflen)
1345 {
1346 int status;
1347
1348 if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1349 return nfserr_resource;
1350 if (whotype != NFS4_ACL_WHO_NAMED)
1351 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1352 else if (group)
1353 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1354 else
1355 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1356 if (status < 0)
1357 return nfserrno(status);
1358 *p = xdr_encode_opaque(*p, NULL, status);
1359 *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1360 BUG_ON(*buflen < 0);
1361 return 0;
1362 }
1363
1364 static inline __be32
1365 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1366 {
1367 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1368 }
1369
1370 static inline __be32
1371 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1372 {
1373 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1374 }
1375
1376 static inline __be32
1377 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1378 __be32 **p, int *buflen)
1379 {
1380 return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1381 }
1382
1383 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1384 FATTR4_WORD0_RDATTR_ERROR)
1385 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1386
1387 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1388 {
1389 /* As per referral draft: */
1390 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1391 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1392 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1393 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1394 *rdattr_err = NFSERR_MOVED;
1395 else
1396 return nfserr_moved;
1397 }
1398 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1399 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1400 return 0;
1401 }
1402
1403 /*
1404 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1405 * ourselves.
1406 *
1407 * @countp is the buffer size in _words_; upon successful return this becomes
1408 * replaced with the number of words written.
1409 */
1410 __be32
1411 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1412 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1413 struct svc_rqst *rqstp, int ignore_crossmnt)
1414 {
1415 u32 bmval0 = bmval[0];
1416 u32 bmval1 = bmval[1];
1417 struct kstat stat;
1418 struct svc_fh tempfh;
1419 struct kstatfs statfs;
1420 int buflen = *countp << 2;
1421 __be32 *attrlenp;
1422 u32 dummy;
1423 u64 dummy64;
1424 u32 rdattr_err = 0;
1425 __be32 *p = buffer;
1426 __be32 status;
1427 int err;
1428 int aclsupport = 0;
1429 struct nfs4_acl *acl = NULL;
1430
1431 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1432 BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1433 BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1434
1435 if (exp->ex_fslocs.migrated) {
1436 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1437 if (status)
1438 goto out;
1439 }
1440
1441 err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1442 if (err)
1443 goto out_nfserr;
1444 if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1445 FATTR4_WORD0_MAXNAME)) ||
1446 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1447 FATTR4_WORD1_SPACE_TOTAL))) {
1448 err = vfs_statfs(dentry, &statfs);
1449 if (err)
1450 goto out_nfserr;
1451 }
1452 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1453 fh_init(&tempfh, NFS4_FHSIZE);
1454 status = fh_compose(&tempfh, exp, dentry, NULL);
1455 if (status)
1456 goto out;
1457 fhp = &tempfh;
1458 }
1459 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1460 | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1461 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1462 aclsupport = (err == 0);
1463 if (bmval0 & FATTR4_WORD0_ACL) {
1464 if (err == -EOPNOTSUPP)
1465 bmval0 &= ~FATTR4_WORD0_ACL;
1466 else if (err == -EINVAL) {
1467 status = nfserr_attrnotsupp;
1468 goto out;
1469 } else if (err != 0)
1470 goto out_nfserr;
1471 }
1472 }
1473 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1474 if (exp->ex_fslocs.locations == NULL) {
1475 bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1476 }
1477 }
1478 if ((buflen -= 16) < 0)
1479 goto out_resource;
1480
1481 WRITE32(2);
1482 WRITE32(bmval0);
1483 WRITE32(bmval1);
1484 attrlenp = p++; /* to be backfilled later */
1485
1486 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1487 u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
1488 if ((buflen -= 12) < 0)
1489 goto out_resource;
1490 if (!aclsupport)
1491 word0 &= ~FATTR4_WORD0_ACL;
1492 if (!exp->ex_fslocs.locations)
1493 word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
1494 WRITE32(2);
1495 WRITE32(word0);
1496 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1497 }
1498 if (bmval0 & FATTR4_WORD0_TYPE) {
1499 if ((buflen -= 4) < 0)
1500 goto out_resource;
1501 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1502 if (dummy == NF4BAD)
1503 goto out_serverfault;
1504 WRITE32(dummy);
1505 }
1506 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1507 if ((buflen -= 4) < 0)
1508 goto out_resource;
1509 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1510 WRITE32(NFS4_FH_PERSISTENT);
1511 else
1512 WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1513 }
1514 if (bmval0 & FATTR4_WORD0_CHANGE) {
1515 /*
1516 * Note: This _must_ be consistent with the scheme for writing
1517 * change_info, so any changes made here must be reflected there
1518 * as well. (See xdr4.h:set_change_info() and the WRITECINFO()
1519 * macro above.)
1520 */
1521 if ((buflen -= 8) < 0)
1522 goto out_resource;
1523 WRITE32(stat.ctime.tv_sec);
1524 WRITE32(stat.ctime.tv_nsec);
1525 }
1526 if (bmval0 & FATTR4_WORD0_SIZE) {
1527 if ((buflen -= 8) < 0)
1528 goto out_resource;
1529 WRITE64(stat.size);
1530 }
1531 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1532 if ((buflen -= 4) < 0)
1533 goto out_resource;
1534 WRITE32(1);
1535 }
1536 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1537 if ((buflen -= 4) < 0)
1538 goto out_resource;
1539 WRITE32(1);
1540 }
1541 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1542 if ((buflen -= 4) < 0)
1543 goto out_resource;
1544 WRITE32(0);
1545 }
1546 if (bmval0 & FATTR4_WORD0_FSID) {
1547 if ((buflen -= 16) < 0)
1548 goto out_resource;
1549 if (exp->ex_fslocs.migrated) {
1550 WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1551 WRITE64(NFS4_REFERRAL_FSID_MINOR);
1552 } else switch(fsid_source(fhp)) {
1553 case FSIDSOURCE_FSID:
1554 WRITE64((u64)exp->ex_fsid);
1555 WRITE64((u64)0);
1556 break;
1557 case FSIDSOURCE_DEV:
1558 WRITE32(0);
1559 WRITE32(MAJOR(stat.dev));
1560 WRITE32(0);
1561 WRITE32(MINOR(stat.dev));
1562 break;
1563 case FSIDSOURCE_UUID:
1564 WRITEMEM(exp->ex_uuid, 16);
1565 break;
1566 }
1567 }
1568 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1569 if ((buflen -= 4) < 0)
1570 goto out_resource;
1571 WRITE32(0);
1572 }
1573 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1574 if ((buflen -= 4) < 0)
1575 goto out_resource;
1576 WRITE32(NFSD_LEASE_TIME);
1577 }
1578 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1579 if ((buflen -= 4) < 0)
1580 goto out_resource;
1581 WRITE32(rdattr_err);
1582 }
1583 if (bmval0 & FATTR4_WORD0_ACL) {
1584 struct nfs4_ace *ace;
1585
1586 if (acl == NULL) {
1587 if ((buflen -= 4) < 0)
1588 goto out_resource;
1589
1590 WRITE32(0);
1591 goto out_acl;
1592 }
1593 if ((buflen -= 4) < 0)
1594 goto out_resource;
1595 WRITE32(acl->naces);
1596
1597 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1598 if ((buflen -= 4*3) < 0)
1599 goto out_resource;
1600 WRITE32(ace->type);
1601 WRITE32(ace->flag);
1602 WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1603 status = nfsd4_encode_aclname(rqstp, ace->whotype,
1604 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1605 &p, &buflen);
1606 if (status == nfserr_resource)
1607 goto out_resource;
1608 if (status)
1609 goto out;
1610 }
1611 }
1612 out_acl:
1613 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1614 if ((buflen -= 4) < 0)
1615 goto out_resource;
1616 WRITE32(aclsupport ?
1617 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1618 }
1619 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1620 if ((buflen -= 4) < 0)
1621 goto out_resource;
1622 WRITE32(1);
1623 }
1624 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1625 if ((buflen -= 4) < 0)
1626 goto out_resource;
1627 WRITE32(1);
1628 }
1629 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1630 if ((buflen -= 4) < 0)
1631 goto out_resource;
1632 WRITE32(1);
1633 }
1634 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1635 if ((buflen -= 4) < 0)
1636 goto out_resource;
1637 WRITE32(1);
1638 }
1639 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1640 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1641 if (buflen < 0)
1642 goto out_resource;
1643 WRITE32(fhp->fh_handle.fh_size);
1644 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1645 }
1646 if (bmval0 & FATTR4_WORD0_FILEID) {
1647 if ((buflen -= 8) < 0)
1648 goto out_resource;
1649 WRITE64(stat.ino);
1650 }
1651 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1652 if ((buflen -= 8) < 0)
1653 goto out_resource;
1654 WRITE64((u64) statfs.f_ffree);
1655 }
1656 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1657 if ((buflen -= 8) < 0)
1658 goto out_resource;
1659 WRITE64((u64) statfs.f_ffree);
1660 }
1661 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1662 if ((buflen -= 8) < 0)
1663 goto out_resource;
1664 WRITE64((u64) statfs.f_files);
1665 }
1666 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1667 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1668 if (status == nfserr_resource)
1669 goto out_resource;
1670 if (status)
1671 goto out;
1672 }
1673 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1674 if ((buflen -= 4) < 0)
1675 goto out_resource;
1676 WRITE32(1);
1677 }
1678 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1679 if ((buflen -= 8) < 0)
1680 goto out_resource;
1681 WRITE64(~(u64)0);
1682 }
1683 if (bmval0 & FATTR4_WORD0_MAXLINK) {
1684 if ((buflen -= 4) < 0)
1685 goto out_resource;
1686 WRITE32(255);
1687 }
1688 if (bmval0 & FATTR4_WORD0_MAXNAME) {
1689 if ((buflen -= 4) < 0)
1690 goto out_resource;
1691 WRITE32(statfs.f_namelen);
1692 }
1693 if (bmval0 & FATTR4_WORD0_MAXREAD) {
1694 if ((buflen -= 8) < 0)
1695 goto out_resource;
1696 WRITE64((u64) svc_max_payload(rqstp));
1697 }
1698 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1699 if ((buflen -= 8) < 0)
1700 goto out_resource;
1701 WRITE64((u64) svc_max_payload(rqstp));
1702 }
1703 if (bmval1 & FATTR4_WORD1_MODE) {
1704 if ((buflen -= 4) < 0)
1705 goto out_resource;
1706 WRITE32(stat.mode & S_IALLUGO);
1707 }
1708 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1709 if ((buflen -= 4) < 0)
1710 goto out_resource;
1711 WRITE32(1);
1712 }
1713 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1714 if ((buflen -= 4) < 0)
1715 goto out_resource;
1716 WRITE32(stat.nlink);
1717 }
1718 if (bmval1 & FATTR4_WORD1_OWNER) {
1719 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1720 if (status == nfserr_resource)
1721 goto out_resource;
1722 if (status)
1723 goto out;
1724 }
1725 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1726 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1727 if (status == nfserr_resource)
1728 goto out_resource;
1729 if (status)
1730 goto out;
1731 }
1732 if (bmval1 & FATTR4_WORD1_RAWDEV) {
1733 if ((buflen -= 8) < 0)
1734 goto out_resource;
1735 WRITE32((u32) MAJOR(stat.rdev));
1736 WRITE32((u32) MINOR(stat.rdev));
1737 }
1738 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1739 if ((buflen -= 8) < 0)
1740 goto out_resource;
1741 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1742 WRITE64(dummy64);
1743 }
1744 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1745 if ((buflen -= 8) < 0)
1746 goto out_resource;
1747 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1748 WRITE64(dummy64);
1749 }
1750 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1751 if ((buflen -= 8) < 0)
1752 goto out_resource;
1753 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1754 WRITE64(dummy64);
1755 }
1756 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1757 if ((buflen -= 8) < 0)
1758 goto out_resource;
1759 dummy64 = (u64)stat.blocks << 9;
1760 WRITE64(dummy64);
1761 }
1762 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1763 if ((buflen -= 12) < 0)
1764 goto out_resource;
1765 WRITE32(0);
1766 WRITE32(stat.atime.tv_sec);
1767 WRITE32(stat.atime.tv_nsec);
1768 }
1769 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1770 if ((buflen -= 12) < 0)
1771 goto out_resource;
1772 WRITE32(0);
1773 WRITE32(1);
1774 WRITE32(0);
1775 }
1776 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1777 if ((buflen -= 12) < 0)
1778 goto out_resource;
1779 WRITE32(0);
1780 WRITE32(stat.ctime.tv_sec);
1781 WRITE32(stat.ctime.tv_nsec);
1782 }
1783 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1784 if ((buflen -= 12) < 0)
1785 goto out_resource;
1786 WRITE32(0);
1787 WRITE32(stat.mtime.tv_sec);
1788 WRITE32(stat.mtime.tv_nsec);
1789 }
1790 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1791 if ((buflen -= 8) < 0)
1792 goto out_resource;
1793 /*
1794 * Get parent's attributes if not ignoring crossmount
1795 * and this is the root of a cross-mounted filesystem.
1796 */
1797 if (ignore_crossmnt == 0 &&
1798 exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
1799 err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
1800 exp->ex_path.mnt->mnt_mountpoint, &stat);
1801 if (err)
1802 goto out_nfserr;
1803 }
1804 WRITE64(stat.ino);
1805 }
1806 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1807 *countp = p - buffer;
1808 status = nfs_ok;
1809
1810 out:
1811 kfree(acl);
1812 if (fhp == &tempfh)
1813 fh_put(&tempfh);
1814 return status;
1815 out_nfserr:
1816 status = nfserrno(err);
1817 goto out;
1818 out_resource:
1819 *countp = 0;
1820 status = nfserr_resource;
1821 goto out;
1822 out_serverfault:
1823 status = nfserr_serverfault;
1824 goto out;
1825 }
1826
1827 static inline int attributes_need_mount(u32 *bmval)
1828 {
1829 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
1830 return 1;
1831 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
1832 return 1;
1833 return 0;
1834 }
1835
1836 static __be32
1837 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1838 const char *name, int namlen, __be32 *p, int *buflen)
1839 {
1840 struct svc_export *exp = cd->rd_fhp->fh_export;
1841 struct dentry *dentry;
1842 __be32 nfserr;
1843 int ignore_crossmnt = 0;
1844
1845 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1846 if (IS_ERR(dentry))
1847 return nfserrno(PTR_ERR(dentry));
1848
1849 exp_get(exp);
1850 /*
1851 * In the case of a mountpoint, the client may be asking for
1852 * attributes that are only properties of the underlying filesystem
1853 * as opposed to the cross-mounted file system. In such a case,
1854 * we will not follow the cross mount and will fill the attribtutes
1855 * directly from the mountpoint dentry.
1856 */
1857 if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
1858 ignore_crossmnt = 1;
1859 else if (d_mountpoint(dentry)) {
1860 int err;
1861
1862 /*
1863 * Why the heck aren't we just using nfsd_lookup??
1864 * Different "."/".." handling? Something else?
1865 * At least, add a comment here to explain....
1866 */
1867 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
1868 if (err) {
1869 nfserr = nfserrno(err);
1870 goto out_put;
1871 }
1872 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
1873 if (nfserr)
1874 goto out_put;
1875
1876 }
1877 nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1878 cd->rd_rqstp, ignore_crossmnt);
1879 out_put:
1880 dput(dentry);
1881 exp_put(exp);
1882 return nfserr;
1883 }
1884
1885 static __be32 *
1886 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
1887 {
1888 __be32 *attrlenp;
1889
1890 if (buflen < 6)
1891 return NULL;
1892 *p++ = htonl(2);
1893 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1894 *p++ = htonl(0); /* bmval1 */
1895
1896 attrlenp = p++;
1897 *p++ = nfserr; /* no htonl */
1898 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1899 return p;
1900 }
1901
1902 static int
1903 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
1904 loff_t offset, u64 ino, unsigned int d_type)
1905 {
1906 struct readdir_cd *ccd = ccdv;
1907 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1908 int buflen;
1909 __be32 *p = cd->buffer;
1910 __be32 nfserr = nfserr_toosmall;
1911
1912 /* In nfsv4, "." and ".." never make it onto the wire.. */
1913 if (name && isdotent(name, namlen)) {
1914 cd->common.err = nfs_ok;
1915 return 0;
1916 }
1917
1918 if (cd->offset)
1919 xdr_encode_hyper(cd->offset, (u64) offset);
1920
1921 buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1922 if (buflen < 0)
1923 goto fail;
1924
1925 *p++ = xdr_one; /* mark entry present */
1926 cd->offset = p; /* remember pointer */
1927 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
1928 p = xdr_encode_array(p, name, namlen); /* name length & name */
1929
1930 nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1931 switch (nfserr) {
1932 case nfs_ok:
1933 p += buflen;
1934 break;
1935 case nfserr_resource:
1936 nfserr = nfserr_toosmall;
1937 goto fail;
1938 case nfserr_dropit:
1939 goto fail;
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->common.err = nfs_ok;
1959 return 0;
1960 fail:
1961 cd->common.err = nfserr;
1962 return -EINVAL;
1963 }
1964
1965 static void
1966 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
1967 {
1968 ENCODE_HEAD;
1969
1970 RESERVE_SPACE(sizeof(stateid_t));
1971 WRITE32(sid->si_generation);
1972 WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
1973 ADJUST_ARGS();
1974 }
1975
1976 static __be32
1977 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1978 {
1979 ENCODE_HEAD;
1980
1981 if (!nfserr) {
1982 RESERVE_SPACE(8);
1983 WRITE32(access->ac_supported);
1984 WRITE32(access->ac_resp_access);
1985 ADJUST_ARGS();
1986 }
1987 return nfserr;
1988 }
1989
1990 static __be32
1991 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
1992 {
1993 ENCODE_SEQID_OP_HEAD;
1994
1995 if (!nfserr)
1996 nfsd4_encode_stateid(resp, &close->cl_stateid);
1997
1998 ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1999 return nfserr;
2000 }
2001
2002
2003 static __be32
2004 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2005 {
2006 ENCODE_HEAD;
2007
2008 if (!nfserr) {
2009 RESERVE_SPACE(8);
2010 WRITEMEM(commit->co_verf.data, 8);
2011 ADJUST_ARGS();
2012 }
2013 return nfserr;
2014 }
2015
2016 static __be32
2017 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2018 {
2019 ENCODE_HEAD;
2020
2021 if (!nfserr) {
2022 RESERVE_SPACE(32);
2023 WRITECINFO(create->cr_cinfo);
2024 WRITE32(2);
2025 WRITE32(create->cr_bmval[0]);
2026 WRITE32(create->cr_bmval[1]);
2027 ADJUST_ARGS();
2028 }
2029 return nfserr;
2030 }
2031
2032 static __be32
2033 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2034 {
2035 struct svc_fh *fhp = getattr->ga_fhp;
2036 int buflen;
2037
2038 if (nfserr)
2039 return nfserr;
2040
2041 buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2042 nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2043 resp->p, &buflen, getattr->ga_bmval,
2044 resp->rqstp, 0);
2045 if (!nfserr)
2046 resp->p += buflen;
2047 return nfserr;
2048 }
2049
2050 static __be32
2051 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2052 {
2053 struct svc_fh *fhp = *fhpp;
2054 unsigned int len;
2055 ENCODE_HEAD;
2056
2057 if (!nfserr) {
2058 len = fhp->fh_handle.fh_size;
2059 RESERVE_SPACE(len + 4);
2060 WRITE32(len);
2061 WRITEMEM(&fhp->fh_handle.fh_base, len);
2062 ADJUST_ARGS();
2063 }
2064 return nfserr;
2065 }
2066
2067 /*
2068 * Including all fields other than the name, a LOCK4denied structure requires
2069 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2070 */
2071 static void
2072 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2073 {
2074 ENCODE_HEAD;
2075
2076 RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2077 WRITE64(ld->ld_start);
2078 WRITE64(ld->ld_length);
2079 WRITE32(ld->ld_type);
2080 if (ld->ld_sop) {
2081 WRITEMEM(&ld->ld_clientid, 8);
2082 WRITE32(ld->ld_sop->so_owner.len);
2083 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2084 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2085 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
2086 WRITE64((u64)0); /* clientid */
2087 WRITE32(0); /* length of owner name */
2088 }
2089 ADJUST_ARGS();
2090 }
2091
2092 static __be32
2093 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2094 {
2095 ENCODE_SEQID_OP_HEAD;
2096
2097 if (!nfserr)
2098 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2099 else if (nfserr == nfserr_denied)
2100 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2101
2102 ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2103 return nfserr;
2104 }
2105
2106 static __be32
2107 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2108 {
2109 if (nfserr == nfserr_denied)
2110 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2111 return nfserr;
2112 }
2113
2114 static __be32
2115 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2116 {
2117 ENCODE_SEQID_OP_HEAD;
2118
2119 if (!nfserr)
2120 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2121
2122 ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2123 return nfserr;
2124 }
2125
2126
2127 static __be32
2128 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2129 {
2130 ENCODE_HEAD;
2131
2132 if (!nfserr) {
2133 RESERVE_SPACE(20);
2134 WRITECINFO(link->li_cinfo);
2135 ADJUST_ARGS();
2136 }
2137 return nfserr;
2138 }
2139
2140
2141 static __be32
2142 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2143 {
2144 ENCODE_HEAD;
2145 ENCODE_SEQID_OP_HEAD;
2146
2147 if (nfserr)
2148 goto out;
2149
2150 nfsd4_encode_stateid(resp, &open->op_stateid);
2151 RESERVE_SPACE(40);
2152 WRITECINFO(open->op_cinfo);
2153 WRITE32(open->op_rflags);
2154 WRITE32(2);
2155 WRITE32(open->op_bmval[0]);
2156 WRITE32(open->op_bmval[1]);
2157 WRITE32(open->op_delegate_type);
2158 ADJUST_ARGS();
2159
2160 switch (open->op_delegate_type) {
2161 case NFS4_OPEN_DELEGATE_NONE:
2162 break;
2163 case NFS4_OPEN_DELEGATE_READ:
2164 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2165 RESERVE_SPACE(20);
2166 WRITE32(open->op_recall);
2167
2168 /*
2169 * TODO: ACE's in delegations
2170 */
2171 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2172 WRITE32(0);
2173 WRITE32(0);
2174 WRITE32(0); /* XXX: is NULL principal ok? */
2175 ADJUST_ARGS();
2176 break;
2177 case NFS4_OPEN_DELEGATE_WRITE:
2178 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2179 RESERVE_SPACE(32);
2180 WRITE32(0);
2181
2182 /*
2183 * TODO: space_limit's in delegations
2184 */
2185 WRITE32(NFS4_LIMIT_SIZE);
2186 WRITE32(~(u32)0);
2187 WRITE32(~(u32)0);
2188
2189 /*
2190 * TODO: ACE's in delegations
2191 */
2192 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2193 WRITE32(0);
2194 WRITE32(0);
2195 WRITE32(0); /* XXX: is NULL principal ok? */
2196 ADJUST_ARGS();
2197 break;
2198 default:
2199 BUG();
2200 }
2201 /* XXX save filehandle here */
2202 out:
2203 ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2204 return nfserr;
2205 }
2206
2207 static __be32
2208 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2209 {
2210 ENCODE_SEQID_OP_HEAD;
2211
2212 if (!nfserr)
2213 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2214
2215 ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2216 return nfserr;
2217 }
2218
2219 static __be32
2220 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2221 {
2222 ENCODE_SEQID_OP_HEAD;
2223
2224 if (!nfserr)
2225 nfsd4_encode_stateid(resp, &od->od_stateid);
2226
2227 ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2228 return nfserr;
2229 }
2230
2231 static __be32
2232 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2233 struct nfsd4_read *read)
2234 {
2235 u32 eof;
2236 int v, pn;
2237 unsigned long maxcount;
2238 long len;
2239 ENCODE_HEAD;
2240
2241 if (nfserr)
2242 return nfserr;
2243 if (resp->xbuf->page_len)
2244 return nfserr_resource;
2245
2246 RESERVE_SPACE(8); /* eof flag and byte count */
2247
2248 maxcount = svc_max_payload(resp->rqstp);
2249 if (maxcount > read->rd_length)
2250 maxcount = read->rd_length;
2251
2252 len = maxcount;
2253 v = 0;
2254 while (len > 0) {
2255 pn = resp->rqstp->rq_resused++;
2256 resp->rqstp->rq_vec[v].iov_base =
2257 page_address(resp->rqstp->rq_respages[pn]);
2258 resp->rqstp->rq_vec[v].iov_len =
2259 len < PAGE_SIZE ? len : PAGE_SIZE;
2260 v++;
2261 len -= PAGE_SIZE;
2262 }
2263 read->rd_vlen = v;
2264
2265 nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2266 read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2267 &maxcount);
2268
2269 if (nfserr == nfserr_symlink)
2270 nfserr = nfserr_inval;
2271 if (nfserr)
2272 return nfserr;
2273 eof = (read->rd_offset + maxcount >=
2274 read->rd_fhp->fh_dentry->d_inode->i_size);
2275
2276 WRITE32(eof);
2277 WRITE32(maxcount);
2278 ADJUST_ARGS();
2279 resp->xbuf->head[0].iov_len = (char*)p
2280 - (char*)resp->xbuf->head[0].iov_base;
2281 resp->xbuf->page_len = maxcount;
2282
2283 /* Use rest of head for padding and remaining ops: */
2284 resp->xbuf->tail[0].iov_base = p;
2285 resp->xbuf->tail[0].iov_len = 0;
2286 if (maxcount&3) {
2287 RESERVE_SPACE(4);
2288 WRITE32(0);
2289 resp->xbuf->tail[0].iov_base += maxcount&3;
2290 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2291 ADJUST_ARGS();
2292 }
2293 return 0;
2294 }
2295
2296 static __be32
2297 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2298 {
2299 int maxcount;
2300 char *page;
2301 ENCODE_HEAD;
2302
2303 if (nfserr)
2304 return nfserr;
2305 if (resp->xbuf->page_len)
2306 return nfserr_resource;
2307
2308 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2309
2310 maxcount = PAGE_SIZE;
2311 RESERVE_SPACE(4);
2312
2313 /*
2314 * XXX: By default, the ->readlink() VFS op will truncate symlinks
2315 * if they would overflow the buffer. Is this kosher in NFSv4? If
2316 * not, one easy fix is: if ->readlink() precisely fills the buffer,
2317 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2318 */
2319 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2320 if (nfserr == nfserr_isdir)
2321 return nfserr_inval;
2322 if (nfserr)
2323 return nfserr;
2324
2325 WRITE32(maxcount);
2326 ADJUST_ARGS();
2327 resp->xbuf->head[0].iov_len = (char*)p
2328 - (char*)resp->xbuf->head[0].iov_base;
2329 resp->xbuf->page_len = maxcount;
2330
2331 /* Use rest of head for padding and remaining ops: */
2332 resp->xbuf->tail[0].iov_base = p;
2333 resp->xbuf->tail[0].iov_len = 0;
2334 if (maxcount&3) {
2335 RESERVE_SPACE(4);
2336 WRITE32(0);
2337 resp->xbuf->tail[0].iov_base += maxcount&3;
2338 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2339 ADJUST_ARGS();
2340 }
2341 return 0;
2342 }
2343
2344 static __be32
2345 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2346 {
2347 int maxcount;
2348 loff_t offset;
2349 __be32 *page, *savep, *tailbase;
2350 ENCODE_HEAD;
2351
2352 if (nfserr)
2353 return nfserr;
2354 if (resp->xbuf->page_len)
2355 return nfserr_resource;
2356
2357 RESERVE_SPACE(8); /* verifier */
2358 savep = p;
2359
2360 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2361 WRITE32(0);
2362 WRITE32(0);
2363 ADJUST_ARGS();
2364 resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2365 tailbase = p;
2366
2367 maxcount = PAGE_SIZE;
2368 if (maxcount > readdir->rd_maxcount)
2369 maxcount = readdir->rd_maxcount;
2370
2371 /*
2372 * Convert from bytes to words, account for the two words already
2373 * written, make sure to leave two words at the end for the next
2374 * pointer and eof field.
2375 */
2376 maxcount = (maxcount >> 2) - 4;
2377 if (maxcount < 0) {
2378 nfserr = nfserr_toosmall;
2379 goto err_no_verf;
2380 }
2381
2382 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2383 readdir->common.err = 0;
2384 readdir->buflen = maxcount;
2385 readdir->buffer = page;
2386 readdir->offset = NULL;
2387
2388 offset = readdir->rd_cookie;
2389 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2390 &offset,
2391 &readdir->common, nfsd4_encode_dirent);
2392 if (nfserr == nfs_ok &&
2393 readdir->common.err == nfserr_toosmall &&
2394 readdir->buffer == page)
2395 nfserr = nfserr_toosmall;
2396 if (nfserr == nfserr_symlink)
2397 nfserr = nfserr_notdir;
2398 if (nfserr)
2399 goto err_no_verf;
2400
2401 if (readdir->offset)
2402 xdr_encode_hyper(readdir->offset, offset);
2403
2404 p = readdir->buffer;
2405 *p++ = 0; /* no more entries */
2406 *p++ = htonl(readdir->common.err == nfserr_eof);
2407 resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2408 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2409
2410 /* Use rest of head for padding and remaining ops: */
2411 resp->xbuf->tail[0].iov_base = tailbase;
2412 resp->xbuf->tail[0].iov_len = 0;
2413 resp->p = resp->xbuf->tail[0].iov_base;
2414 resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2415
2416 return 0;
2417 err_no_verf:
2418 p = savep;
2419 ADJUST_ARGS();
2420 return nfserr;
2421 }
2422
2423 static __be32
2424 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2425 {
2426 ENCODE_HEAD;
2427
2428 if (!nfserr) {
2429 RESERVE_SPACE(20);
2430 WRITECINFO(remove->rm_cinfo);
2431 ADJUST_ARGS();
2432 }
2433 return nfserr;
2434 }
2435
2436 static __be32
2437 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2438 {
2439 ENCODE_HEAD;
2440
2441 if (!nfserr) {
2442 RESERVE_SPACE(40);
2443 WRITECINFO(rename->rn_sinfo);
2444 WRITECINFO(rename->rn_tinfo);
2445 ADJUST_ARGS();
2446 }
2447 return nfserr;
2448 }
2449
2450 static __be32
2451 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2452 struct nfsd4_secinfo *secinfo)
2453 {
2454 int i = 0;
2455 struct svc_export *exp = secinfo->si_exp;
2456 u32 nflavs;
2457 struct exp_flavor_info *flavs;
2458 struct exp_flavor_info def_flavs[2];
2459 ENCODE_HEAD;
2460
2461 if (nfserr)
2462 goto out;
2463 if (exp->ex_nflavors) {
2464 flavs = exp->ex_flavors;
2465 nflavs = exp->ex_nflavors;
2466 } else { /* Handling of some defaults in absence of real secinfo: */
2467 flavs = def_flavs;
2468 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2469 nflavs = 2;
2470 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2471 flavs[1].pseudoflavor = RPC_AUTH_NULL;
2472 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2473 nflavs = 1;
2474 flavs[0].pseudoflavor
2475 = svcauth_gss_flavor(exp->ex_client);
2476 } else {
2477 nflavs = 1;
2478 flavs[0].pseudoflavor
2479 = exp->ex_client->flavour->flavour;
2480 }
2481 }
2482
2483 RESERVE_SPACE(4);
2484 WRITE32(nflavs);
2485 ADJUST_ARGS();
2486 for (i = 0; i < nflavs; i++) {
2487 u32 flav = flavs[i].pseudoflavor;
2488 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2489
2490 if (gm) {
2491 RESERVE_SPACE(4);
2492 WRITE32(RPC_AUTH_GSS);
2493 ADJUST_ARGS();
2494 RESERVE_SPACE(4 + gm->gm_oid.len);
2495 WRITE32(gm->gm_oid.len);
2496 WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2497 ADJUST_ARGS();
2498 RESERVE_SPACE(4);
2499 WRITE32(0); /* qop */
2500 ADJUST_ARGS();
2501 RESERVE_SPACE(4);
2502 WRITE32(gss_pseudoflavor_to_service(gm, flav));
2503 ADJUST_ARGS();
2504 gss_mech_put(gm);
2505 } else {
2506 RESERVE_SPACE(4);
2507 WRITE32(flav);
2508 ADJUST_ARGS();
2509 }
2510 }
2511 out:
2512 if (exp)
2513 exp_put(exp);
2514 return nfserr;
2515 }
2516
2517 /*
2518 * The SETATTR encode routine is special -- it always encodes a bitmap,
2519 * regardless of the error status.
2520 */
2521 static __be32
2522 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2523 {
2524 ENCODE_HEAD;
2525
2526 RESERVE_SPACE(12);
2527 if (nfserr) {
2528 WRITE32(2);
2529 WRITE32(0);
2530 WRITE32(0);
2531 }
2532 else {
2533 WRITE32(2);
2534 WRITE32(setattr->sa_bmval[0]);
2535 WRITE32(setattr->sa_bmval[1]);
2536 }
2537 ADJUST_ARGS();
2538 return nfserr;
2539 }
2540
2541 static __be32
2542 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2543 {
2544 ENCODE_HEAD;
2545
2546 if (!nfserr) {
2547 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2548 WRITEMEM(&scd->se_clientid, 8);
2549 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2550 ADJUST_ARGS();
2551 }
2552 else if (nfserr == nfserr_clid_inuse) {
2553 RESERVE_SPACE(8);
2554 WRITE32(0);
2555 WRITE32(0);
2556 ADJUST_ARGS();
2557 }
2558 return nfserr;
2559 }
2560
2561 static __be32
2562 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2563 {
2564 ENCODE_HEAD;
2565
2566 if (!nfserr) {
2567 RESERVE_SPACE(16);
2568 WRITE32(write->wr_bytes_written);
2569 WRITE32(write->wr_how_written);
2570 WRITEMEM(write->wr_verifier.data, 8);
2571 ADJUST_ARGS();
2572 }
2573 return nfserr;
2574 }
2575
2576 static __be32
2577 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
2578 {
2579 return nfserr;
2580 }
2581
2582 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
2583
2584 static nfsd4_enc nfsd4_enc_ops[] = {
2585 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
2586 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
2587 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
2588 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
2589 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
2590 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
2591 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
2592 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
2593 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
2594 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
2595 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
2596 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
2597 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
2598 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
2599 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
2600 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
2601 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
2602 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
2603 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
2604 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
2605 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
2606 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
2607 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
2608 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
2609 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
2610 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
2611 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
2612 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
2613 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
2614 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
2615 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
2616 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
2617 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
2618 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
2619 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
2620 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
2621 };
2622
2623 void
2624 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2625 {
2626 __be32 *statp;
2627 ENCODE_HEAD;
2628
2629 RESERVE_SPACE(8);
2630 WRITE32(op->opnum);
2631 statp = p++; /* to be backfilled at the end */
2632 ADJUST_ARGS();
2633
2634 if (op->opnum == OP_ILLEGAL)
2635 goto status;
2636 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
2637 !nfsd4_enc_ops[op->opnum]);
2638 op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
2639 status:
2640 /*
2641 * Note: We write the status directly, instead of using WRITE32(),
2642 * since it is already in network byte order.
2643 */
2644 *statp = op->status;
2645 }
2646
2647 /*
2648 * Encode the reply stored in the stateowner reply cache
2649 *
2650 * XDR note: do not encode rp->rp_buflen: the buffer contains the
2651 * previously sent already encoded operation.
2652 *
2653 * called with nfs4_lock_state() held
2654 */
2655 void
2656 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2657 {
2658 ENCODE_HEAD;
2659 struct nfs4_replay *rp = op->replay;
2660
2661 BUG_ON(!rp);
2662
2663 RESERVE_SPACE(8);
2664 WRITE32(op->opnum);
2665 *p++ = rp->rp_status; /* already xdr'ed */
2666 ADJUST_ARGS();
2667
2668 RESERVE_SPACE(rp->rp_buflen);
2669 WRITEMEM(rp->rp_buf, rp->rp_buflen);
2670 ADJUST_ARGS();
2671 }
2672
2673 /*
2674 * END OF "GENERIC" ENCODE ROUTINES.
2675 */
2676
2677 int
2678 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
2679 {
2680 return xdr_ressize_check(rqstp, p);
2681 }
2682
2683 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2684 {
2685 if (args->ops != args->iops) {
2686 kfree(args->ops);
2687 args->ops = args->iops;
2688 }
2689 kfree(args->tmpp);
2690 args->tmpp = NULL;
2691 while (args->to_free) {
2692 struct tmpbuf *tb = args->to_free;
2693 args->to_free = tb->next;
2694 tb->release(tb->buf);
2695 kfree(tb);
2696 }
2697 }
2698
2699 int
2700 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
2701 {
2702 __be32 status;
2703
2704 args->p = p;
2705 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2706 args->pagelist = rqstp->rq_arg.pages;
2707 args->pagelen = rqstp->rq_arg.page_len;
2708 args->tmpp = NULL;
2709 args->to_free = NULL;
2710 args->ops = args->iops;
2711 args->rqstp = rqstp;
2712
2713 status = nfsd4_decode_compound(args);
2714 if (status) {
2715 nfsd4_release_compoundargs(args);
2716 }
2717 return !status;
2718 }
2719
2720 int
2721 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
2722 {
2723 /*
2724 * All that remains is to write the tag and operation count...
2725 */
2726 struct kvec *iov;
2727 p = resp->tagp;
2728 *p++ = htonl(resp->taglen);
2729 memcpy(p, resp->tag, resp->taglen);
2730 p += XDR_QUADLEN(resp->taglen);
2731 *p++ = htonl(resp->opcnt);
2732
2733 if (rqstp->rq_res.page_len)
2734 iov = &rqstp->rq_res.tail[0];
2735 else
2736 iov = &rqstp->rq_res.head[0];
2737 iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2738 BUG_ON(iov->iov_len > PAGE_SIZE);
2739 return 1;
2740 }
2741
2742 /*
2743 * Local variables:
2744 * c-basic-offset: 8
2745 * End:
2746 */
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