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Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
[linux/fpc-iii.git] / fs / nfsd / nfs4xdr.c
blob74c00bc92b9af6b01e95e55c119b90d61fbf9d34
1 /*
2 * Server-side XDR for NFSv4
3 *
4 * Copyright (c) 2002 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <andros@umich.edu>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 * TODO: Neil Brown made the following observation: We currently
36 * initially reserve NFSD_BUFSIZE space on the transmit queue and
37 * never release any of that until the request is complete.
38 * It would be good to calculate a new maximum response size while
39 * decoding the COMPOUND, and call svc_reserve with this number
40 * at the end of nfs4svc_decode_compoundargs.
41 */
42
43 #include <linux/slab.h>
44 #include <linux/namei.h>
45 #include <linux/statfs.h>
46 #include <linux/utsname.h>
47 #include <linux/pagemap.h>
48 #include <linux/sunrpc/svcauth_gss.h>
49
50 #include "idmap.h"
51 #include "acl.h"
52 #include "xdr4.h"
53 #include "vfs.h"
54 #include "state.h"
55 #include "cache.h"
56
57 #define NFSDDBG_FACILITY NFSDDBG_XDR
58
59 /*
60 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
61 * directory in order to indicate to the client that a filesystem boundary is present
62 * We use a fixed fsid for a referral
63 */
64 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
65 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
66
67 static __be32
68 check_filename(char *str, int len, __be32 err)
69 {
70 int i;
71
72 if (len == 0)
73 return nfserr_inval;
74 if (isdotent(str, len))
75 return err;
76 for (i = 0; i < len; i++)
77 if (str[i] == '/')
78 return err;
79 return 0;
80 }
81
82 #define DECODE_HEAD \
83 __be32 *p; \
84 __be32 status
85 #define DECODE_TAIL \
86 status = 0; \
87 out: \
88 return status; \
89 xdr_error: \
90 dprintk("NFSD: xdr error (%s:%d)\n", \
91 __FILE__, __LINE__); \
92 status = nfserr_bad_xdr; \
93 goto out
94
95 #define READ32(x) (x) = ntohl(*p++)
96 #define READ64(x) do { \
97 (x) = (u64)ntohl(*p++) << 32; \
98 (x) |= ntohl(*p++); \
99 } while (0)
100 #define READTIME(x) do { \
101 p++; \
102 (x) = ntohl(*p++); \
103 p++; \
104 } while (0)
105 #define READMEM(x,nbytes) do { \
106 x = (char *)p; \
107 p += XDR_QUADLEN(nbytes); \
108 } while (0)
109 #define SAVEMEM(x,nbytes) do { \
110 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
111 savemem(argp, p, nbytes) : \
112 (char *)p)) { \
113 dprintk("NFSD: xdr error (%s:%d)\n", \
114 __FILE__, __LINE__); \
115 goto xdr_error; \
116 } \
117 p += XDR_QUADLEN(nbytes); \
118 } while (0)
119 #define COPYMEM(x,nbytes) do { \
120 memcpy((x), p, nbytes); \
121 p += XDR_QUADLEN(nbytes); \
122 } while (0)
123
124 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
125 #define READ_BUF(nbytes) do { \
126 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
127 p = argp->p; \
128 argp->p += XDR_QUADLEN(nbytes); \
129 } else if (!(p = read_buf(argp, nbytes))) { \
130 dprintk("NFSD: xdr error (%s:%d)\n", \
131 __FILE__, __LINE__); \
132 goto xdr_error; \
133 } \
134 } while (0)
135
136 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
137 {
138 /* We want more bytes than seem to be available.
139 * Maybe we need a new page, maybe we have just run out
140 */
141 unsigned int avail = (char *)argp->end - (char *)argp->p;
142 __be32 *p;
143 if (avail + argp->pagelen < nbytes)
144 return NULL;
145 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
146 return NULL;
147 /* ok, we can do it with the current plus the next page */
148 if (nbytes <= sizeof(argp->tmp))
149 p = argp->tmp;
150 else {
151 kfree(argp->tmpp);
152 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
153 if (!p)
154 return NULL;
155
156 }
157 /*
158 * The following memcpy is safe because read_buf is always
159 * called with nbytes > avail, and the two cases above both
160 * guarantee p points to at least nbytes bytes.
161 */
162 memcpy(p, argp->p, avail);
163 /* step to next page */
164 argp->p = page_address(argp->pagelist[0]);
165 argp->pagelist++;
166 if (argp->pagelen < PAGE_SIZE) {
167 argp->end = argp->p + (argp->pagelen>>2);
168 argp->pagelen = 0;
169 } else {
170 argp->end = argp->p + (PAGE_SIZE>>2);
171 argp->pagelen -= PAGE_SIZE;
172 }
173 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
174 argp->p += XDR_QUADLEN(nbytes - avail);
175 return p;
176 }
177
178 static int zero_clientid(clientid_t *clid)
179 {
180 return (clid->cl_boot == 0) && (clid->cl_id == 0);
181 }
182
183 static int
184 defer_free(struct nfsd4_compoundargs *argp,
185 void (*release)(const void *), void *p)
186 {
187 struct tmpbuf *tb;
188
189 tb = kmalloc(sizeof(*tb), GFP_KERNEL);
190 if (!tb)
191 return -ENOMEM;
192 tb->buf = p;
193 tb->release = release;
194 tb->next = argp->to_free;
195 argp->to_free = tb;
196 return 0;
197 }
198
199 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
200 {
201 if (p == argp->tmp) {
202 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
203 if (!p)
204 return NULL;
205 } else {
206 BUG_ON(p != argp->tmpp);
207 argp->tmpp = NULL;
208 }
209 if (defer_free(argp, kfree, p)) {
210 kfree(p);
211 return NULL;
212 } else
213 return (char *)p;
214 }
215
216 static __be32
217 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
218 {
219 u32 bmlen;
220 DECODE_HEAD;
221
222 bmval[0] = 0;
223 bmval[1] = 0;
224 bmval[2] = 0;
225
226 READ_BUF(4);
227 READ32(bmlen);
228 if (bmlen > 1000)
229 goto xdr_error;
230
231 READ_BUF(bmlen << 2);
232 if (bmlen > 0)
233 READ32(bmval[0]);
234 if (bmlen > 1)
235 READ32(bmval[1]);
236 if (bmlen > 2)
237 READ32(bmval[2]);
238
239 DECODE_TAIL;
240 }
241
242 static __be32
243 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
244 struct iattr *iattr, struct nfs4_acl **acl)
245 {
246 int expected_len, len = 0;
247 u32 dummy32;
248 char *buf;
249 int host_err;
250
251 DECODE_HEAD;
252 iattr->ia_valid = 0;
253 if ((status = nfsd4_decode_bitmap(argp, bmval)))
254 return status;
255
256 READ_BUF(4);
257 READ32(expected_len);
258
259 if (bmval[0] & FATTR4_WORD0_SIZE) {
260 READ_BUF(8);
261 len += 8;
262 READ64(iattr->ia_size);
263 iattr->ia_valid |= ATTR_SIZE;
264 }
265 if (bmval[0] & FATTR4_WORD0_ACL) {
266 int nace;
267 struct nfs4_ace *ace;
268
269 READ_BUF(4); len += 4;
270 READ32(nace);
271
272 if (nace > NFS4_ACL_MAX)
273 return nfserr_resource;
274
275 *acl = nfs4_acl_new(nace);
276 if (*acl == NULL) {
277 host_err = -ENOMEM;
278 goto out_nfserr;
279 }
280 defer_free(argp, kfree, *acl);
281
282 (*acl)->naces = nace;
283 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
284 READ_BUF(16); len += 16;
285 READ32(ace->type);
286 READ32(ace->flag);
287 READ32(ace->access_mask);
288 READ32(dummy32);
289 READ_BUF(dummy32);
290 len += XDR_QUADLEN(dummy32) << 2;
291 READMEM(buf, dummy32);
292 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
293 status = nfs_ok;
294 if (ace->whotype != NFS4_ACL_WHO_NAMED)
295 ace->who = 0;
296 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
297 status = nfsd_map_name_to_gid(argp->rqstp,
298 buf, dummy32, &ace->who);
299 else
300 status = nfsd_map_name_to_uid(argp->rqstp,
301 buf, dummy32, &ace->who);
302 if (status)
303 return status;
304 }
305 } else
306 *acl = NULL;
307 if (bmval[1] & FATTR4_WORD1_MODE) {
308 READ_BUF(4);
309 len += 4;
310 READ32(iattr->ia_mode);
311 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
312 iattr->ia_valid |= ATTR_MODE;
313 }
314 if (bmval[1] & FATTR4_WORD1_OWNER) {
315 READ_BUF(4);
316 len += 4;
317 READ32(dummy32);
318 READ_BUF(dummy32);
319 len += (XDR_QUADLEN(dummy32) << 2);
320 READMEM(buf, dummy32);
321 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
322 return status;
323 iattr->ia_valid |= ATTR_UID;
324 }
325 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
326 READ_BUF(4);
327 len += 4;
328 READ32(dummy32);
329 READ_BUF(dummy32);
330 len += (XDR_QUADLEN(dummy32) << 2);
331 READMEM(buf, dummy32);
332 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
333 return status;
334 iattr->ia_valid |= ATTR_GID;
335 }
336 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
337 READ_BUF(4);
338 len += 4;
339 READ32(dummy32);
340 switch (dummy32) {
341 case NFS4_SET_TO_CLIENT_TIME:
342 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
343 all 32 bits of 'nseconds'. */
344 READ_BUF(12);
345 len += 12;
346 READ32(dummy32);
347 if (dummy32)
348 return nfserr_inval;
349 READ32(iattr->ia_atime.tv_sec);
350 READ32(iattr->ia_atime.tv_nsec);
351 if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
352 return nfserr_inval;
353 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
354 break;
355 case NFS4_SET_TO_SERVER_TIME:
356 iattr->ia_valid |= ATTR_ATIME;
357 break;
358 default:
359 goto xdr_error;
360 }
361 }
362 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
363 READ_BUF(4);
364 len += 4;
365 READ32(dummy32);
366 switch (dummy32) {
367 case NFS4_SET_TO_CLIENT_TIME:
368 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
369 all 32 bits of 'nseconds'. */
370 READ_BUF(12);
371 len += 12;
372 READ32(dummy32);
373 if (dummy32)
374 return nfserr_inval;
375 READ32(iattr->ia_mtime.tv_sec);
376 READ32(iattr->ia_mtime.tv_nsec);
377 if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
378 return nfserr_inval;
379 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
380 break;
381 case NFS4_SET_TO_SERVER_TIME:
382 iattr->ia_valid |= ATTR_MTIME;
383 break;
384 default:
385 goto xdr_error;
386 }
387 }
388 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
389 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
390 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
391 READ_BUF(expected_len - len);
392 else if (len != expected_len)
393 goto xdr_error;
394
395 DECODE_TAIL;
396
397 out_nfserr:
398 status = nfserrno(host_err);
399 goto out;
400 }
401
402 static __be32
403 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
404 {
405 DECODE_HEAD;
406
407 READ_BUF(sizeof(stateid_t));
408 READ32(sid->si_generation);
409 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
410
411 DECODE_TAIL;
412 }
413
414 static __be32
415 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
416 {
417 DECODE_HEAD;
418
419 READ_BUF(4);
420 READ32(access->ac_req_access);
421
422 DECODE_TAIL;
423 }
424
425 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
426 {
427 DECODE_HEAD;
428
429 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
430 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
431 READ32(bcts->dir);
432 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
433 * could help us figure out we should be using it. */
434 DECODE_TAIL;
435 }
436
437 static __be32
438 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
439 {
440 DECODE_HEAD;
441
442 READ_BUF(4);
443 READ32(close->cl_seqid);
444 return nfsd4_decode_stateid(argp, &close->cl_stateid);
445
446 DECODE_TAIL;
447 }
448
449
450 static __be32
451 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
452 {
453 DECODE_HEAD;
454
455 READ_BUF(12);
456 READ64(commit->co_offset);
457 READ32(commit->co_count);
458
459 DECODE_TAIL;
460 }
461
462 static __be32
463 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
464 {
465 DECODE_HEAD;
466
467 READ_BUF(4);
468 READ32(create->cr_type);
469 switch (create->cr_type) {
470 case NF4LNK:
471 READ_BUF(4);
472 READ32(create->cr_linklen);
473 READ_BUF(create->cr_linklen);
474 SAVEMEM(create->cr_linkname, create->cr_linklen);
475 break;
476 case NF4BLK:
477 case NF4CHR:
478 READ_BUF(8);
479 READ32(create->cr_specdata1);
480 READ32(create->cr_specdata2);
481 break;
482 case NF4SOCK:
483 case NF4FIFO:
484 case NF4DIR:
485 default:
486 break;
487 }
488
489 READ_BUF(4);
490 READ32(create->cr_namelen);
491 READ_BUF(create->cr_namelen);
492 SAVEMEM(create->cr_name, create->cr_namelen);
493 if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
494 return status;
495
496 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
497 &create->cr_acl);
498 if (status)
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 /*
537 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
538 */
539 READ_BUF(28);
540 READ32(lock->lk_type);
541 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
542 goto xdr_error;
543 READ32(lock->lk_reclaim);
544 READ64(lock->lk_offset);
545 READ64(lock->lk_length);
546 READ32(lock->lk_is_new);
547
548 if (lock->lk_is_new) {
549 READ_BUF(4);
550 READ32(lock->lk_new_open_seqid);
551 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
552 if (status)
553 return status;
554 READ_BUF(8 + sizeof(clientid_t));
555 READ32(lock->lk_new_lock_seqid);
556 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
557 READ32(lock->lk_new_owner.len);
558 READ_BUF(lock->lk_new_owner.len);
559 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
560 } else {
561 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
562 if (status)
563 return status;
564 READ_BUF(4);
565 READ32(lock->lk_old_lock_seqid);
566 }
567
568 DECODE_TAIL;
569 }
570
571 static __be32
572 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
573 {
574 DECODE_HEAD;
575
576 READ_BUF(32);
577 READ32(lockt->lt_type);
578 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
579 goto xdr_error;
580 READ64(lockt->lt_offset);
581 READ64(lockt->lt_length);
582 COPYMEM(&lockt->lt_clientid, 8);
583 READ32(lockt->lt_owner.len);
584 READ_BUF(lockt->lt_owner.len);
585 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
586
587 DECODE_TAIL;
588 }
589
590 static __be32
591 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
592 {
593 DECODE_HEAD;
594
595 READ_BUF(8);
596 READ32(locku->lu_type);
597 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
598 goto xdr_error;
599 READ32(locku->lu_seqid);
600 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
601 if (status)
602 return status;
603 READ_BUF(16);
604 READ64(locku->lu_offset);
605 READ64(locku->lu_length);
606
607 DECODE_TAIL;
608 }
609
610 static __be32
611 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
612 {
613 DECODE_HEAD;
614
615 READ_BUF(4);
616 READ32(lookup->lo_len);
617 READ_BUF(lookup->lo_len);
618 SAVEMEM(lookup->lo_name, lookup->lo_len);
619 if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
620 return status;
621
622 DECODE_TAIL;
623 }
624
625 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
626 {
627 __be32 *p;
628 u32 w;
629
630 READ_BUF(4);
631 READ32(w);
632 *share_access = w & NFS4_SHARE_ACCESS_MASK;
633 *deleg_want = w & NFS4_SHARE_WANT_MASK;
634 if (deleg_when)
635 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
636
637 switch (w & NFS4_SHARE_ACCESS_MASK) {
638 case NFS4_SHARE_ACCESS_READ:
639 case NFS4_SHARE_ACCESS_WRITE:
640 case NFS4_SHARE_ACCESS_BOTH:
641 break;
642 default:
643 return nfserr_bad_xdr;
644 }
645 w &= ~NFS4_SHARE_ACCESS_MASK;
646 if (!w)
647 return nfs_ok;
648 if (!argp->minorversion)
649 return nfserr_bad_xdr;
650 switch (w & NFS4_SHARE_WANT_MASK) {
651 case NFS4_SHARE_WANT_NO_PREFERENCE:
652 case NFS4_SHARE_WANT_READ_DELEG:
653 case NFS4_SHARE_WANT_WRITE_DELEG:
654 case NFS4_SHARE_WANT_ANY_DELEG:
655 case NFS4_SHARE_WANT_NO_DELEG:
656 case NFS4_SHARE_WANT_CANCEL:
657 break;
658 default:
659 return nfserr_bad_xdr;
660 }
661 w &= ~NFS4_SHARE_WANT_MASK;
662 if (!w)
663 return nfs_ok;
664
665 if (!deleg_when) /* open_downgrade */
666 return nfserr_inval;
667 switch (w) {
668 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
669 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
670 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
671 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
672 return nfs_ok;
673 }
674 xdr_error:
675 return nfserr_bad_xdr;
676 }
677
678 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
679 {
680 __be32 *p;
681
682 READ_BUF(4);
683 READ32(*x);
684 /* Note: unlinke access bits, deny bits may be zero. */
685 if (*x & ~NFS4_SHARE_DENY_BOTH)
686 return nfserr_bad_xdr;
687 return nfs_ok;
688 xdr_error:
689 return nfserr_bad_xdr;
690 }
691
692 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
693 {
694 __be32 *p;
695
696 READ_BUF(4);
697 READ32(o->len);
698
699 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
700 return nfserr_bad_xdr;
701
702 READ_BUF(o->len);
703 SAVEMEM(o->data, o->len);
704 return nfs_ok;
705 xdr_error:
706 return nfserr_bad_xdr;
707 }
708
709 static __be32
710 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
711 {
712 DECODE_HEAD;
713 u32 dummy;
714
715 memset(open->op_bmval, 0, sizeof(open->op_bmval));
716 open->op_iattr.ia_valid = 0;
717 open->op_openowner = NULL;
718
719 /* seqid, share_access, share_deny, clientid, ownerlen */
720 READ_BUF(4);
721 READ32(open->op_seqid);
722 /* decode, yet ignore deleg_when until supported */
723 status = nfsd4_decode_share_access(argp, &open->op_share_access,
724 &open->op_deleg_want, &dummy);
725 if (status)
726 goto xdr_error;
727 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
728 if (status)
729 goto xdr_error;
730 READ_BUF(sizeof(clientid_t));
731 COPYMEM(&open->op_clientid, sizeof(clientid_t));
732 status = nfsd4_decode_opaque(argp, &open->op_owner);
733 if (status)
734 goto xdr_error;
735 READ_BUF(4);
736 READ32(open->op_create);
737 switch (open->op_create) {
738 case NFS4_OPEN_NOCREATE:
739 break;
740 case NFS4_OPEN_CREATE:
741 READ_BUF(4);
742 READ32(open->op_createmode);
743 switch (open->op_createmode) {
744 case NFS4_CREATE_UNCHECKED:
745 case NFS4_CREATE_GUARDED:
746 status = nfsd4_decode_fattr(argp, open->op_bmval,
747 &open->op_iattr, &open->op_acl);
748 if (status)
749 goto out;
750 break;
751 case NFS4_CREATE_EXCLUSIVE:
752 READ_BUF(NFS4_VERIFIER_SIZE);
753 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
754 break;
755 case NFS4_CREATE_EXCLUSIVE4_1:
756 if (argp->minorversion < 1)
757 goto xdr_error;
758 READ_BUF(NFS4_VERIFIER_SIZE);
759 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
760 status = nfsd4_decode_fattr(argp, open->op_bmval,
761 &open->op_iattr, &open->op_acl);
762 if (status)
763 goto out;
764 break;
765 default:
766 goto xdr_error;
767 }
768 break;
769 default:
770 goto xdr_error;
771 }
772
773 /* open_claim */
774 READ_BUF(4);
775 READ32(open->op_claim_type);
776 switch (open->op_claim_type) {
777 case NFS4_OPEN_CLAIM_NULL:
778 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
779 READ_BUF(4);
780 READ32(open->op_fname.len);
781 READ_BUF(open->op_fname.len);
782 SAVEMEM(open->op_fname.data, open->op_fname.len);
783 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
784 return status;
785 break;
786 case NFS4_OPEN_CLAIM_PREVIOUS:
787 READ_BUF(4);
788 READ32(open->op_delegate_type);
789 break;
790 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
791 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
792 if (status)
793 return status;
794 READ_BUF(4);
795 READ32(open->op_fname.len);
796 READ_BUF(open->op_fname.len);
797 SAVEMEM(open->op_fname.data, open->op_fname.len);
798 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
799 return status;
800 break;
801 case NFS4_OPEN_CLAIM_FH:
802 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
803 if (argp->minorversion < 1)
804 goto xdr_error;
805 /* void */
806 break;
807 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
808 if (argp->minorversion < 1)
809 goto xdr_error;
810 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
811 if (status)
812 return status;
813 break;
814 default:
815 goto xdr_error;
816 }
817
818 DECODE_TAIL;
819 }
820
821 static __be32
822 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
823 {
824 DECODE_HEAD;
825
826 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
827 if (status)
828 return status;
829 READ_BUF(4);
830 READ32(open_conf->oc_seqid);
831
832 DECODE_TAIL;
833 }
834
835 static __be32
836 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
837 {
838 DECODE_HEAD;
839
840 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
841 if (status)
842 return status;
843 READ_BUF(4);
844 READ32(open_down->od_seqid);
845 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
846 &open_down->od_deleg_want, NULL);
847 if (status)
848 return status;
849 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
850 if (status)
851 return status;
852 DECODE_TAIL;
853 }
854
855 static __be32
856 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
857 {
858 DECODE_HEAD;
859
860 READ_BUF(4);
861 READ32(putfh->pf_fhlen);
862 if (putfh->pf_fhlen > NFS4_FHSIZE)
863 goto xdr_error;
864 READ_BUF(putfh->pf_fhlen);
865 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
866
867 DECODE_TAIL;
868 }
869
870 static __be32
871 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
872 {
873 DECODE_HEAD;
874
875 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
876 if (status)
877 return status;
878 READ_BUF(12);
879 READ64(read->rd_offset);
880 READ32(read->rd_length);
881
882 DECODE_TAIL;
883 }
884
885 static __be32
886 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
887 {
888 DECODE_HEAD;
889
890 READ_BUF(24);
891 READ64(readdir->rd_cookie);
892 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
893 READ32(readdir->rd_dircount); /* just in case you needed a useless field... */
894 READ32(readdir->rd_maxcount);
895 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
896 goto out;
897
898 DECODE_TAIL;
899 }
900
901 static __be32
902 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
903 {
904 DECODE_HEAD;
905
906 READ_BUF(4);
907 READ32(remove->rm_namelen);
908 READ_BUF(remove->rm_namelen);
909 SAVEMEM(remove->rm_name, remove->rm_namelen);
910 if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
911 return status;
912
913 DECODE_TAIL;
914 }
915
916 static __be32
917 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
918 {
919 DECODE_HEAD;
920
921 READ_BUF(4);
922 READ32(rename->rn_snamelen);
923 READ_BUF(rename->rn_snamelen + 4);
924 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
925 READ32(rename->rn_tnamelen);
926 READ_BUF(rename->rn_tnamelen);
927 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
928 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
929 return status;
930 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
931 return status;
932
933 DECODE_TAIL;
934 }
935
936 static __be32
937 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
938 {
939 DECODE_HEAD;
940
941 READ_BUF(sizeof(clientid_t));
942 COPYMEM(clientid, sizeof(clientid_t));
943
944 DECODE_TAIL;
945 }
946
947 static __be32
948 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
949 struct nfsd4_secinfo *secinfo)
950 {
951 DECODE_HEAD;
952
953 READ_BUF(4);
954 READ32(secinfo->si_namelen);
955 READ_BUF(secinfo->si_namelen);
956 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
957 status = check_filename(secinfo->si_name, secinfo->si_namelen,
958 nfserr_noent);
959 if (status)
960 return status;
961 DECODE_TAIL;
962 }
963
964 static __be32
965 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
966 struct nfsd4_secinfo_no_name *sin)
967 {
968 DECODE_HEAD;
969
970 READ_BUF(4);
971 READ32(sin->sin_style);
972 DECODE_TAIL;
973 }
974
975 static __be32
976 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
977 {
978 __be32 status;
979
980 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
981 if (status)
982 return status;
983 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
984 &setattr->sa_acl);
985 }
986
987 static __be32
988 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
989 {
990 DECODE_HEAD;
991
992 READ_BUF(NFS4_VERIFIER_SIZE);
993 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
994
995 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
996 if (status)
997 return nfserr_bad_xdr;
998 READ_BUF(8);
999 READ32(setclientid->se_callback_prog);
1000 READ32(setclientid->se_callback_netid_len);
1001
1002 READ_BUF(setclientid->se_callback_netid_len + 4);
1003 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1004 READ32(setclientid->se_callback_addr_len);
1005
1006 READ_BUF(setclientid->se_callback_addr_len + 4);
1007 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1008 READ32(setclientid->se_callback_ident);
1009
1010 DECODE_TAIL;
1011 }
1012
1013 static __be32
1014 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1015 {
1016 DECODE_HEAD;
1017
1018 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1019 COPYMEM(&scd_c->sc_clientid, 8);
1020 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1021
1022 DECODE_TAIL;
1023 }
1024
1025 /* Also used for NVERIFY */
1026 static __be32
1027 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1028 {
1029 #if 0
1030 struct nfsd4_compoundargs save = {
1031 .p = argp->p,
1032 .end = argp->end,
1033 .rqstp = argp->rqstp,
1034 };
1035 u32 ve_bmval[2];
1036 struct iattr ve_iattr; /* request */
1037 struct nfs4_acl *ve_acl; /* request */
1038 #endif
1039 DECODE_HEAD;
1040
1041 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1042 goto out;
1043
1044 /* For convenience's sake, we compare raw xdr'd attributes in
1045 * nfsd4_proc_verify; however we still decode here just to return
1046 * correct error in case of bad xdr. */
1047 #if 0
1048 status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
1049 if (status == nfserr_inval) {
1050 status = nfserrno(status);
1051 goto out;
1052 }
1053 #endif
1054 READ_BUF(4);
1055 READ32(verify->ve_attrlen);
1056 READ_BUF(verify->ve_attrlen);
1057 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1058
1059 DECODE_TAIL;
1060 }
1061
1062 static __be32
1063 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1064 {
1065 int avail;
1066 int v;
1067 int len;
1068 DECODE_HEAD;
1069
1070 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1071 if (status)
1072 return status;
1073 READ_BUF(16);
1074 READ64(write->wr_offset);
1075 READ32(write->wr_stable_how);
1076 if (write->wr_stable_how > 2)
1077 goto xdr_error;
1078 READ32(write->wr_buflen);
1079
1080 /* Sorry .. no magic macros for this.. *
1081 * READ_BUF(write->wr_buflen);
1082 * SAVEMEM(write->wr_buf, write->wr_buflen);
1083 */
1084 avail = (char*)argp->end - (char*)argp->p;
1085 if (avail + argp->pagelen < write->wr_buflen) {
1086 dprintk("NFSD: xdr error (%s:%d)\n",
1087 __FILE__, __LINE__);
1088 goto xdr_error;
1089 }
1090 argp->rqstp->rq_vec[0].iov_base = p;
1091 argp->rqstp->rq_vec[0].iov_len = avail;
1092 v = 0;
1093 len = write->wr_buflen;
1094 while (len > argp->rqstp->rq_vec[v].iov_len) {
1095 len -= argp->rqstp->rq_vec[v].iov_len;
1096 v++;
1097 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
1098 argp->pagelist++;
1099 if (argp->pagelen >= PAGE_SIZE) {
1100 argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1101 argp->pagelen -= PAGE_SIZE;
1102 } else {
1103 argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
1104 argp->pagelen -= len;
1105 }
1106 }
1107 argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1108 argp->p = (__be32*) (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1109 argp->rqstp->rq_vec[v].iov_len = len;
1110 write->wr_vlen = v+1;
1111
1112 DECODE_TAIL;
1113 }
1114
1115 static __be32
1116 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1117 {
1118 DECODE_HEAD;
1119
1120 READ_BUF(12);
1121 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1122 READ32(rlockowner->rl_owner.len);
1123 READ_BUF(rlockowner->rl_owner.len);
1124 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1125
1126 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1127 return nfserr_inval;
1128 DECODE_TAIL;
1129 }
1130
1131 static __be32
1132 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1133 struct nfsd4_exchange_id *exid)
1134 {
1135 int dummy, tmp;
1136 DECODE_HEAD;
1137
1138 READ_BUF(NFS4_VERIFIER_SIZE);
1139 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1140
1141 status = nfsd4_decode_opaque(argp, &exid->clname);
1142 if (status)
1143 return nfserr_bad_xdr;
1144
1145 READ_BUF(4);
1146 READ32(exid->flags);
1147
1148 /* Ignore state_protect4_a */
1149 READ_BUF(4);
1150 READ32(exid->spa_how);
1151 switch (exid->spa_how) {
1152 case SP4_NONE:
1153 break;
1154 case SP4_MACH_CRED:
1155 /* spo_must_enforce */
1156 READ_BUF(4);
1157 READ32(dummy);
1158 READ_BUF(dummy * 4);
1159 p += dummy;
1160
1161 /* spo_must_allow */
1162 READ_BUF(4);
1163 READ32(dummy);
1164 READ_BUF(dummy * 4);
1165 p += dummy;
1166 break;
1167 case SP4_SSV:
1168 /* ssp_ops */
1169 READ_BUF(4);
1170 READ32(dummy);
1171 READ_BUF(dummy * 4);
1172 p += dummy;
1173
1174 READ_BUF(4);
1175 READ32(dummy);
1176 READ_BUF(dummy * 4);
1177 p += dummy;
1178
1179 /* ssp_hash_algs<> */
1180 READ_BUF(4);
1181 READ32(tmp);
1182 while (tmp--) {
1183 READ_BUF(4);
1184 READ32(dummy);
1185 READ_BUF(dummy);
1186 p += XDR_QUADLEN(dummy);
1187 }
1188
1189 /* ssp_encr_algs<> */
1190 READ_BUF(4);
1191 READ32(tmp);
1192 while (tmp--) {
1193 READ_BUF(4);
1194 READ32(dummy);
1195 READ_BUF(dummy);
1196 p += XDR_QUADLEN(dummy);
1197 }
1198
1199 /* ssp_window and ssp_num_gss_handles */
1200 READ_BUF(8);
1201 READ32(dummy);
1202 READ32(dummy);
1203 break;
1204 default:
1205 goto xdr_error;
1206 }
1207
1208 /* Ignore Implementation ID */
1209 READ_BUF(4); /* nfs_impl_id4 array length */
1210 READ32(dummy);
1211
1212 if (dummy > 1)
1213 goto xdr_error;
1214
1215 if (dummy == 1) {
1216 /* nii_domain */
1217 READ_BUF(4);
1218 READ32(dummy);
1219 READ_BUF(dummy);
1220 p += XDR_QUADLEN(dummy);
1221
1222 /* nii_name */
1223 READ_BUF(4);
1224 READ32(dummy);
1225 READ_BUF(dummy);
1226 p += XDR_QUADLEN(dummy);
1227
1228 /* nii_date */
1229 READ_BUF(12);
1230 p += 3;
1231 }
1232 DECODE_TAIL;
1233 }
1234
1235 static __be32
1236 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1237 struct nfsd4_create_session *sess)
1238 {
1239 DECODE_HEAD;
1240
1241 u32 dummy;
1242 char *machine_name;
1243 int i;
1244 int nr_secflavs;
1245
1246 READ_BUF(16);
1247 COPYMEM(&sess->clientid, 8);
1248 READ32(sess->seqid);
1249 READ32(sess->flags);
1250
1251 /* Fore channel attrs */
1252 READ_BUF(28);
1253 READ32(dummy); /* headerpadsz is always 0 */
1254 READ32(sess->fore_channel.maxreq_sz);
1255 READ32(sess->fore_channel.maxresp_sz);
1256 READ32(sess->fore_channel.maxresp_cached);
1257 READ32(sess->fore_channel.maxops);
1258 READ32(sess->fore_channel.maxreqs);
1259 READ32(sess->fore_channel.nr_rdma_attrs);
1260 if (sess->fore_channel.nr_rdma_attrs == 1) {
1261 READ_BUF(4);
1262 READ32(sess->fore_channel.rdma_attrs);
1263 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1264 dprintk("Too many fore channel attr bitmaps!\n");
1265 goto xdr_error;
1266 }
1267
1268 /* Back channel attrs */
1269 READ_BUF(28);
1270 READ32(dummy); /* headerpadsz is always 0 */
1271 READ32(sess->back_channel.maxreq_sz);
1272 READ32(sess->back_channel.maxresp_sz);
1273 READ32(sess->back_channel.maxresp_cached);
1274 READ32(sess->back_channel.maxops);
1275 READ32(sess->back_channel.maxreqs);
1276 READ32(sess->back_channel.nr_rdma_attrs);
1277 if (sess->back_channel.nr_rdma_attrs == 1) {
1278 READ_BUF(4);
1279 READ32(sess->back_channel.rdma_attrs);
1280 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1281 dprintk("Too many back channel attr bitmaps!\n");
1282 goto xdr_error;
1283 }
1284
1285 READ_BUF(8);
1286 READ32(sess->callback_prog);
1287
1288 /* callback_sec_params4 */
1289 READ32(nr_secflavs);
1290 for (i = 0; i < nr_secflavs; ++i) {
1291 READ_BUF(4);
1292 READ32(dummy);
1293 switch (dummy) {
1294 case RPC_AUTH_NULL:
1295 /* Nothing to read */
1296 break;
1297 case RPC_AUTH_UNIX:
1298 READ_BUF(8);
1299 /* stamp */
1300 READ32(dummy);
1301
1302 /* machine name */
1303 READ32(dummy);
1304 READ_BUF(dummy);
1305 SAVEMEM(machine_name, dummy);
1306
1307 /* uid, gid */
1308 READ_BUF(8);
1309 READ32(sess->uid);
1310 READ32(sess->gid);
1311
1312 /* more gids */
1313 READ_BUF(4);
1314 READ32(dummy);
1315 READ_BUF(dummy * 4);
1316 break;
1317 case RPC_AUTH_GSS:
1318 dprintk("RPC_AUTH_GSS callback secflavor "
1319 "not supported!\n");
1320 READ_BUF(8);
1321 /* gcbp_service */
1322 READ32(dummy);
1323 /* gcbp_handle_from_server */
1324 READ32(dummy);
1325 READ_BUF(dummy);
1326 p += XDR_QUADLEN(dummy);
1327 /* gcbp_handle_from_client */
1328 READ_BUF(4);
1329 READ32(dummy);
1330 READ_BUF(dummy);
1331 break;
1332 default:
1333 dprintk("Illegal callback secflavor\n");
1334 return nfserr_inval;
1335 }
1336 }
1337 DECODE_TAIL;
1338 }
1339
1340 static __be32
1341 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1342 struct nfsd4_destroy_session *destroy_session)
1343 {
1344 DECODE_HEAD;
1345 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1346 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1347
1348 DECODE_TAIL;
1349 }
1350
1351 static __be32
1352 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1353 struct nfsd4_free_stateid *free_stateid)
1354 {
1355 DECODE_HEAD;
1356
1357 READ_BUF(sizeof(stateid_t));
1358 READ32(free_stateid->fr_stateid.si_generation);
1359 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1360
1361 DECODE_TAIL;
1362 }
1363
1364 static __be32
1365 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1366 struct nfsd4_sequence *seq)
1367 {
1368 DECODE_HEAD;
1369
1370 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1371 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1372 READ32(seq->seqid);
1373 READ32(seq->slotid);
1374 READ32(seq->maxslots);
1375 READ32(seq->cachethis);
1376
1377 DECODE_TAIL;
1378 }
1379
1380 static __be32
1381 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1382 {
1383 int i;
1384 __be32 *p, status;
1385 struct nfsd4_test_stateid_id *stateid;
1386
1387 READ_BUF(4);
1388 test_stateid->ts_num_ids = ntohl(*p++);
1389
1390 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1391
1392 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1393 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1394 if (!stateid) {
1395 status = nfserrno(-ENOMEM);
1396 goto out;
1397 }
1398
1399 defer_free(argp, kfree, stateid);
1400 INIT_LIST_HEAD(&stateid->ts_id_list);
1401 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1402
1403 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1404 if (status)
1405 goto out;
1406 }
1407
1408 status = 0;
1409 out:
1410 return status;
1411 xdr_error:
1412 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1413 status = nfserr_bad_xdr;
1414 goto out;
1415 }
1416
1417 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1418 {
1419 DECODE_HEAD;
1420
1421 READ_BUF(8);
1422 COPYMEM(&dc->clientid, 8);
1423
1424 DECODE_TAIL;
1425 }
1426
1427 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1428 {
1429 DECODE_HEAD;
1430
1431 READ_BUF(4);
1432 READ32(rc->rca_one_fs);
1433
1434 DECODE_TAIL;
1435 }
1436
1437 static __be32
1438 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1439 {
1440 return nfs_ok;
1441 }
1442
1443 static __be32
1444 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1445 {
1446 return nfserr_notsupp;
1447 }
1448
1449 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1450
1451 static nfsd4_dec nfsd4_dec_ops[] = {
1452 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1453 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1454 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1455 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1456 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1457 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1458 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1459 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1460 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1461 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1462 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1463 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1464 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1465 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1466 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1467 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1468 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1469 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1470 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1471 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1472 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_noop,
1473 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1474 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1475 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1476 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1477 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1478 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1479 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1480 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1481 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1482 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1483 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1484 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1485 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1486 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1487 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1488 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1489 };
1490
1491 static nfsd4_dec nfsd41_dec_ops[] = {
1492 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1493 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1494 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1495 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1496 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1497 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1498 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1499 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1500 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1501 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1502 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1503 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1504 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1505 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1506 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1507 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1508 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1509 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_notsupp,
1510 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1511 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1512 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_notsupp,
1513 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1514 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1515 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1516 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1517 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1518 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1519 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_notsupp,
1520 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1521 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1522 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1523 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1524 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_notsupp,
1525 [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1526 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1527 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1528 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_notsupp,
1529
1530 /* new operations for NFSv4.1 */
1531 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_notsupp,
1532 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1533 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1534 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1535 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1536 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1537 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1538 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1539 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1540 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1541 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1542 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1543 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1544 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1545 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1546 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1547 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1548 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1549 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1550 };
1551
1552 struct nfsd4_minorversion_ops {
1553 nfsd4_dec *decoders;
1554 int nops;
1555 };
1556
1557 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1558 [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1559 [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1560 };
1561
1562 static __be32
1563 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1564 {
1565 DECODE_HEAD;
1566 struct nfsd4_op *op;
1567 struct nfsd4_minorversion_ops *ops;
1568 bool cachethis = false;
1569 int i;
1570
1571 /*
1572 * XXX: According to spec, we should check the tag
1573 * for UTF-8 compliance. I'm postponing this for
1574 * now because it seems that some clients do use
1575 * binary tags.
1576 */
1577 READ_BUF(4);
1578 READ32(argp->taglen);
1579 READ_BUF(argp->taglen + 8);
1580 SAVEMEM(argp->tag, argp->taglen);
1581 READ32(argp->minorversion);
1582 READ32(argp->opcnt);
1583
1584 if (argp->taglen > NFSD4_MAX_TAGLEN)
1585 goto xdr_error;
1586 if (argp->opcnt > 100)
1587 goto xdr_error;
1588
1589 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1590 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1591 if (!argp->ops) {
1592 argp->ops = argp->iops;
1593 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1594 goto xdr_error;
1595 }
1596 }
1597
1598 if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1599 argp->opcnt = 0;
1600
1601 ops = &nfsd4_minorversion[argp->minorversion];
1602 for (i = 0; i < argp->opcnt; i++) {
1603 op = &argp->ops[i];
1604 op->replay = NULL;
1605
1606 /*
1607 * We can't use READ_BUF() here because we need to handle
1608 * a missing opcode as an OP_WRITE + 1. So we need to check
1609 * to see if we're truly at the end of our buffer or if there
1610 * is another page we need to flip to.
1611 */
1612
1613 if (argp->p == argp->end) {
1614 if (argp->pagelen < 4) {
1615 /* There isn't an opcode still on the wire */
1616 op->opnum = OP_WRITE + 1;
1617 op->status = nfserr_bad_xdr;
1618 argp->opcnt = i+1;
1619 break;
1620 }
1621
1622 /*
1623 * False alarm. We just hit a page boundary, but there
1624 * is still data available. Move pointer across page
1625 * boundary. *snip from READ_BUF*
1626 */
1627 argp->p = page_address(argp->pagelist[0]);
1628 argp->pagelist++;
1629 if (argp->pagelen < PAGE_SIZE) {
1630 argp->end = argp->p + (argp->pagelen>>2);
1631 argp->pagelen = 0;
1632 } else {
1633 argp->end = argp->p + (PAGE_SIZE>>2);
1634 argp->pagelen -= PAGE_SIZE;
1635 }
1636 }
1637 op->opnum = ntohl(*argp->p++);
1638
1639 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1640 op->status = ops->decoders[op->opnum](argp, &op->u);
1641 else {
1642 op->opnum = OP_ILLEGAL;
1643 op->status = nfserr_op_illegal;
1644 }
1645
1646 if (op->status) {
1647 argp->opcnt = i+1;
1648 break;
1649 }
1650 /*
1651 * We'll try to cache the result in the DRC if any one
1652 * op in the compound wants to be cached:
1653 */
1654 cachethis |= nfsd4_cache_this_op(op);
1655 }
1656 /* Sessions make the DRC unnecessary: */
1657 if (argp->minorversion)
1658 cachethis = false;
1659 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1660
1661 DECODE_TAIL;
1662 }
1663
1664 #define WRITE32(n) *p++ = htonl(n)
1665 #define WRITE64(n) do { \
1666 *p++ = htonl((u32)((n) >> 32)); \
1667 *p++ = htonl((u32)(n)); \
1668 } while (0)
1669 #define WRITEMEM(ptr,nbytes) do { if (nbytes > 0) { \
1670 *(p + XDR_QUADLEN(nbytes) -1) = 0; \
1671 memcpy(p, ptr, nbytes); \
1672 p += XDR_QUADLEN(nbytes); \
1673 }} while (0)
1674
1675 static void write32(__be32 **p, u32 n)
1676 {
1677 *(*p)++ = n;
1678 }
1679
1680 static void write64(__be32 **p, u64 n)
1681 {
1682 write32(p, (u32)(n >> 32));
1683 write32(p, (u32)n);
1684 }
1685
1686 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1687 {
1688 if (IS_I_VERSION(inode)) {
1689 write64(p, inode->i_version);
1690 } else {
1691 write32(p, stat->ctime.tv_sec);
1692 write32(p, stat->ctime.tv_nsec);
1693 }
1694 }
1695
1696 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1697 {
1698 write32(p, c->atomic);
1699 if (c->change_supported) {
1700 write64(p, c->before_change);
1701 write64(p, c->after_change);
1702 } else {
1703 write32(p, c->before_ctime_sec);
1704 write32(p, c->before_ctime_nsec);
1705 write32(p, c->after_ctime_sec);
1706 write32(p, c->after_ctime_nsec);
1707 }
1708 }
1709
1710 #define RESERVE_SPACE(nbytes) do { \
1711 p = resp->p; \
1712 BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end); \
1713 } while (0)
1714 #define ADJUST_ARGS() resp->p = p
1715
1716 /*
1717 * Header routine to setup seqid operation replay cache
1718 */
1719 #define ENCODE_SEQID_OP_HEAD \
1720 __be32 *save; \
1721 \
1722 save = resp->p;
1723
1724 /*
1725 * Routine for encoding the result of a "seqid-mutating" NFSv4 operation. This
1726 * is where sequence id's are incremented, and the replay cache is filled.
1727 * Note that we increment sequence id's here, at the last moment, so we're sure
1728 * we know whether the error to be returned is a sequence id mutating error.
1729 */
1730
1731 static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, __be32 nfserr)
1732 {
1733 struct nfs4_stateowner *stateowner = resp->cstate.replay_owner;
1734
1735 if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {
1736 stateowner->so_seqid++;
1737 stateowner->so_replay.rp_status = nfserr;
1738 stateowner->so_replay.rp_buflen =
1739 (char *)resp->p - (char *)save;
1740 memcpy(stateowner->so_replay.rp_buf, save,
1741 stateowner->so_replay.rp_buflen);
1742 nfsd4_purge_closed_stateid(stateowner);
1743 }
1744 }
1745
1746 /* Encode as an array of strings the string given with components
1747 * separated @sep.
1748 */
1749 static __be32 nfsd4_encode_components(char sep, char *components,
1750 __be32 **pp, int *buflen)
1751 {
1752 __be32 *p = *pp;
1753 __be32 *countp = p;
1754 int strlen, count=0;
1755 char *str, *end;
1756
1757 dprintk("nfsd4_encode_components(%s)\n", components);
1758 if ((*buflen -= 4) < 0)
1759 return nfserr_resource;
1760 WRITE32(0); /* We will fill this in with @count later */
1761 end = str = components;
1762 while (*end) {
1763 for (; *end && (*end != sep); end++)
1764 ; /* Point to end of component */
1765 strlen = end - str;
1766 if (strlen) {
1767 if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1768 return nfserr_resource;
1769 WRITE32(strlen);
1770 WRITEMEM(str, strlen);
1771 count++;
1772 }
1773 else
1774 end++;
1775 str = end;
1776 }
1777 *pp = p;
1778 p = countp;
1779 WRITE32(count);
1780 return 0;
1781 }
1782
1783 /*
1784 * encode a location element of a fs_locations structure
1785 */
1786 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1787 __be32 **pp, int *buflen)
1788 {
1789 __be32 status;
1790 __be32 *p = *pp;
1791
1792 status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1793 if (status)
1794 return status;
1795 status = nfsd4_encode_components('/', location->path, &p, buflen);
1796 if (status)
1797 return status;
1798 *pp = p;
1799 return 0;
1800 }
1801
1802 /*
1803 * Encode a path in RFC3530 'pathname4' format
1804 */
1805 static __be32 nfsd4_encode_path(const struct path *root,
1806 const struct path *path, __be32 **pp, int *buflen)
1807 {
1808 struct path cur = {
1809 .mnt = path->mnt,
1810 .dentry = path->dentry,
1811 };
1812 __be32 *p = *pp;
1813 struct dentry **components = NULL;
1814 unsigned int ncomponents = 0;
1815 __be32 err = nfserr_jukebox;
1816
1817 dprintk("nfsd4_encode_components(");
1818
1819 path_get(&cur);
1820 /* First walk the path up to the nfsd root, and store the
1821 * dentries/path components in an array.
1822 */
1823 for (;;) {
1824 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1825 break;
1826 if (cur.dentry == cur.mnt->mnt_root) {
1827 if (follow_up(&cur))
1828 continue;
1829 goto out_free;
1830 }
1831 if ((ncomponents & 15) == 0) {
1832 struct dentry **new;
1833 new = krealloc(components,
1834 sizeof(*new) * (ncomponents + 16),
1835 GFP_KERNEL);
1836 if (!new)
1837 goto out_free;
1838 components = new;
1839 }
1840 components[ncomponents++] = cur.dentry;
1841 cur.dentry = dget_parent(cur.dentry);
1842 }
1843
1844 *buflen -= 4;
1845 if (*buflen < 0)
1846 goto out_free;
1847 WRITE32(ncomponents);
1848
1849 while (ncomponents) {
1850 struct dentry *dentry = components[ncomponents - 1];
1851 unsigned int len = dentry->d_name.len;
1852
1853 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1854 if (*buflen < 0)
1855 goto out_free;
1856 WRITE32(len);
1857 WRITEMEM(dentry->d_name.name, len);
1858 dprintk("/%s", dentry->d_name.name);
1859 dput(dentry);
1860 ncomponents--;
1861 }
1862
1863 *pp = p;
1864 err = 0;
1865 out_free:
1866 dprintk(")\n");
1867 while (ncomponents)
1868 dput(components[--ncomponents]);
1869 kfree(components);
1870 path_put(&cur);
1871 return err;
1872 }
1873
1874 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1875 const struct path *path, __be32 **pp, int *buflen)
1876 {
1877 struct svc_export *exp_ps;
1878 __be32 res;
1879
1880 exp_ps = rqst_find_fsidzero_export(rqstp);
1881 if (IS_ERR(exp_ps))
1882 return nfserrno(PTR_ERR(exp_ps));
1883 res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1884 exp_put(exp_ps);
1885 return res;
1886 }
1887
1888 /*
1889 * encode a fs_locations structure
1890 */
1891 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1892 struct svc_export *exp,
1893 __be32 **pp, int *buflen)
1894 {
1895 __be32 status;
1896 int i;
1897 __be32 *p = *pp;
1898 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1899
1900 status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1901 if (status)
1902 return status;
1903 if ((*buflen -= 4) < 0)
1904 return nfserr_resource;
1905 WRITE32(fslocs->locations_count);
1906 for (i=0; i<fslocs->locations_count; i++) {
1907 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1908 &p, buflen);
1909 if (status)
1910 return status;
1911 }
1912 *pp = p;
1913 return 0;
1914 }
1915
1916 static u32 nfs4_file_type(umode_t mode)
1917 {
1918 switch (mode & S_IFMT) {
1919 case S_IFIFO: return NF4FIFO;
1920 case S_IFCHR: return NF4CHR;
1921 case S_IFDIR: return NF4DIR;
1922 case S_IFBLK: return NF4BLK;
1923 case S_IFLNK: return NF4LNK;
1924 case S_IFREG: return NF4REG;
1925 case S_IFSOCK: return NF4SOCK;
1926 default: return NF4BAD;
1927 };
1928 }
1929
1930 static __be32
1931 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1932 __be32 **p, int *buflen)
1933 {
1934 int status;
1935
1936 if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1937 return nfserr_resource;
1938 if (whotype != NFS4_ACL_WHO_NAMED)
1939 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1940 else if (group)
1941 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1942 else
1943 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1944 if (status < 0)
1945 return nfserrno(status);
1946 *p = xdr_encode_opaque(*p, NULL, status);
1947 *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1948 BUG_ON(*buflen < 0);
1949 return 0;
1950 }
1951
1952 static inline __be32
1953 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1954 {
1955 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1956 }
1957
1958 static inline __be32
1959 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1960 {
1961 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1962 }
1963
1964 static inline __be32
1965 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1966 __be32 **p, int *buflen)
1967 {
1968 return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1969 }
1970
1971 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1972 FATTR4_WORD0_RDATTR_ERROR)
1973 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1974
1975 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1976 {
1977 /* As per referral draft: */
1978 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1979 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1980 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1981 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1982 *rdattr_err = NFSERR_MOVED;
1983 else
1984 return nfserr_moved;
1985 }
1986 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1987 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1988 return 0;
1989 }
1990
1991 /*
1992 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1993 * ourselves.
1994 *
1995 * @countp is the buffer size in _words_; upon successful return this becomes
1996 * replaced with the number of words written.
1997 */
1998 __be32
1999 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2000 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
2001 struct svc_rqst *rqstp, int ignore_crossmnt)
2002 {
2003 u32 bmval0 = bmval[0];
2004 u32 bmval1 = bmval[1];
2005 u32 bmval2 = bmval[2];
2006 struct kstat stat;
2007 struct svc_fh tempfh;
2008 struct kstatfs statfs;
2009 int buflen = *countp << 2;
2010 __be32 *attrlenp;
2011 u32 dummy;
2012 u64 dummy64;
2013 u32 rdattr_err = 0;
2014 __be32 *p = buffer;
2015 __be32 status;
2016 int err;
2017 int aclsupport = 0;
2018 struct nfs4_acl *acl = NULL;
2019 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2020 u32 minorversion = resp->cstate.minorversion;
2021 struct path path = {
2022 .mnt = exp->ex_path.mnt,
2023 .dentry = dentry,
2024 };
2025
2026 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2027 BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2028 BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2029 BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2030
2031 if (exp->ex_fslocs.migrated) {
2032 BUG_ON(bmval[2]);
2033 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2034 if (status)
2035 goto out;
2036 }
2037
2038 err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
2039 if (err)
2040 goto out_nfserr;
2041 if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2042 FATTR4_WORD0_MAXNAME)) ||
2043 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2044 FATTR4_WORD1_SPACE_TOTAL))) {
2045 err = vfs_statfs(&path, &statfs);
2046 if (err)
2047 goto out_nfserr;
2048 }
2049 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2050 fh_init(&tempfh, NFS4_FHSIZE);
2051 status = fh_compose(&tempfh, exp, dentry, NULL);
2052 if (status)
2053 goto out;
2054 fhp = &tempfh;
2055 }
2056 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2057 | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2058 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2059 aclsupport = (err == 0);
2060 if (bmval0 & FATTR4_WORD0_ACL) {
2061 if (err == -EOPNOTSUPP)
2062 bmval0 &= ~FATTR4_WORD0_ACL;
2063 else if (err == -EINVAL) {
2064 status = nfserr_attrnotsupp;
2065 goto out;
2066 } else if (err != 0)
2067 goto out_nfserr;
2068 }
2069 }
2070
2071 if (bmval2) {
2072 if ((buflen -= 16) < 0)
2073 goto out_resource;
2074 WRITE32(3);
2075 WRITE32(bmval0);
2076 WRITE32(bmval1);
2077 WRITE32(bmval2);
2078 } else if (bmval1) {
2079 if ((buflen -= 12) < 0)
2080 goto out_resource;
2081 WRITE32(2);
2082 WRITE32(bmval0);
2083 WRITE32(bmval1);
2084 } else {
2085 if ((buflen -= 8) < 0)
2086 goto out_resource;
2087 WRITE32(1);
2088 WRITE32(bmval0);
2089 }
2090 attrlenp = p++; /* to be backfilled later */
2091
2092 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2093 u32 word0 = nfsd_suppattrs0(minorversion);
2094 u32 word1 = nfsd_suppattrs1(minorversion);
2095 u32 word2 = nfsd_suppattrs2(minorversion);
2096
2097 if (!aclsupport)
2098 word0 &= ~FATTR4_WORD0_ACL;
2099 if (!word2) {
2100 if ((buflen -= 12) < 0)
2101 goto out_resource;
2102 WRITE32(2);
2103 WRITE32(word0);
2104 WRITE32(word1);
2105 } else {
2106 if ((buflen -= 16) < 0)
2107 goto out_resource;
2108 WRITE32(3);
2109 WRITE32(word0);
2110 WRITE32(word1);
2111 WRITE32(word2);
2112 }
2113 }
2114 if (bmval0 & FATTR4_WORD0_TYPE) {
2115 if ((buflen -= 4) < 0)
2116 goto out_resource;
2117 dummy = nfs4_file_type(stat.mode);
2118 if (dummy == NF4BAD)
2119 goto out_serverfault;
2120 WRITE32(dummy);
2121 }
2122 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2123 if ((buflen -= 4) < 0)
2124 goto out_resource;
2125 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2126 WRITE32(NFS4_FH_PERSISTENT);
2127 else
2128 WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2129 }
2130 if (bmval0 & FATTR4_WORD0_CHANGE) {
2131 if ((buflen -= 8) < 0)
2132 goto out_resource;
2133 write_change(&p, &stat, dentry->d_inode);
2134 }
2135 if (bmval0 & FATTR4_WORD0_SIZE) {
2136 if ((buflen -= 8) < 0)
2137 goto out_resource;
2138 WRITE64(stat.size);
2139 }
2140 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2141 if ((buflen -= 4) < 0)
2142 goto out_resource;
2143 WRITE32(1);
2144 }
2145 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2146 if ((buflen -= 4) < 0)
2147 goto out_resource;
2148 WRITE32(1);
2149 }
2150 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2151 if ((buflen -= 4) < 0)
2152 goto out_resource;
2153 WRITE32(0);
2154 }
2155 if (bmval0 & FATTR4_WORD0_FSID) {
2156 if ((buflen -= 16) < 0)
2157 goto out_resource;
2158 if (exp->ex_fslocs.migrated) {
2159 WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2160 WRITE64(NFS4_REFERRAL_FSID_MINOR);
2161 } else switch(fsid_source(fhp)) {
2162 case FSIDSOURCE_FSID:
2163 WRITE64((u64)exp->ex_fsid);
2164 WRITE64((u64)0);
2165 break;
2166 case FSIDSOURCE_DEV:
2167 WRITE32(0);
2168 WRITE32(MAJOR(stat.dev));
2169 WRITE32(0);
2170 WRITE32(MINOR(stat.dev));
2171 break;
2172 case FSIDSOURCE_UUID:
2173 WRITEMEM(exp->ex_uuid, 16);
2174 break;
2175 }
2176 }
2177 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2178 if ((buflen -= 4) < 0)
2179 goto out_resource;
2180 WRITE32(0);
2181 }
2182 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2183 if ((buflen -= 4) < 0)
2184 goto out_resource;
2185 WRITE32(nfsd4_lease);
2186 }
2187 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2188 if ((buflen -= 4) < 0)
2189 goto out_resource;
2190 WRITE32(rdattr_err);
2191 }
2192 if (bmval0 & FATTR4_WORD0_ACL) {
2193 struct nfs4_ace *ace;
2194
2195 if (acl == NULL) {
2196 if ((buflen -= 4) < 0)
2197 goto out_resource;
2198
2199 WRITE32(0);
2200 goto out_acl;
2201 }
2202 if ((buflen -= 4) < 0)
2203 goto out_resource;
2204 WRITE32(acl->naces);
2205
2206 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2207 if ((buflen -= 4*3) < 0)
2208 goto out_resource;
2209 WRITE32(ace->type);
2210 WRITE32(ace->flag);
2211 WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2212 status = nfsd4_encode_aclname(rqstp, ace->whotype,
2213 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
2214 &p, &buflen);
2215 if (status == nfserr_resource)
2216 goto out_resource;
2217 if (status)
2218 goto out;
2219 }
2220 }
2221 out_acl:
2222 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2223 if ((buflen -= 4) < 0)
2224 goto out_resource;
2225 WRITE32(aclsupport ?
2226 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2227 }
2228 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2229 if ((buflen -= 4) < 0)
2230 goto out_resource;
2231 WRITE32(1);
2232 }
2233 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2234 if ((buflen -= 4) < 0)
2235 goto out_resource;
2236 WRITE32(1);
2237 }
2238 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2239 if ((buflen -= 4) < 0)
2240 goto out_resource;
2241 WRITE32(1);
2242 }
2243 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2244 if ((buflen -= 4) < 0)
2245 goto out_resource;
2246 WRITE32(1);
2247 }
2248 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2249 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2250 if (buflen < 0)
2251 goto out_resource;
2252 WRITE32(fhp->fh_handle.fh_size);
2253 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2254 }
2255 if (bmval0 & FATTR4_WORD0_FILEID) {
2256 if ((buflen -= 8) < 0)
2257 goto out_resource;
2258 WRITE64(stat.ino);
2259 }
2260 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2261 if ((buflen -= 8) < 0)
2262 goto out_resource;
2263 WRITE64((u64) statfs.f_ffree);
2264 }
2265 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2266 if ((buflen -= 8) < 0)
2267 goto out_resource;
2268 WRITE64((u64) statfs.f_ffree);
2269 }
2270 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2271 if ((buflen -= 8) < 0)
2272 goto out_resource;
2273 WRITE64((u64) statfs.f_files);
2274 }
2275 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2276 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2277 if (status == nfserr_resource)
2278 goto out_resource;
2279 if (status)
2280 goto out;
2281 }
2282 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2283 if ((buflen -= 4) < 0)
2284 goto out_resource;
2285 WRITE32(1);
2286 }
2287 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2288 if ((buflen -= 8) < 0)
2289 goto out_resource;
2290 WRITE64(~(u64)0);
2291 }
2292 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2293 if ((buflen -= 4) < 0)
2294 goto out_resource;
2295 WRITE32(255);
2296 }
2297 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2298 if ((buflen -= 4) < 0)
2299 goto out_resource;
2300 WRITE32(statfs.f_namelen);
2301 }
2302 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2303 if ((buflen -= 8) < 0)
2304 goto out_resource;
2305 WRITE64((u64) svc_max_payload(rqstp));
2306 }
2307 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2308 if ((buflen -= 8) < 0)
2309 goto out_resource;
2310 WRITE64((u64) svc_max_payload(rqstp));
2311 }
2312 if (bmval1 & FATTR4_WORD1_MODE) {
2313 if ((buflen -= 4) < 0)
2314 goto out_resource;
2315 WRITE32(stat.mode & S_IALLUGO);
2316 }
2317 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2318 if ((buflen -= 4) < 0)
2319 goto out_resource;
2320 WRITE32(1);
2321 }
2322 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2323 if ((buflen -= 4) < 0)
2324 goto out_resource;
2325 WRITE32(stat.nlink);
2326 }
2327 if (bmval1 & FATTR4_WORD1_OWNER) {
2328 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2329 if (status == nfserr_resource)
2330 goto out_resource;
2331 if (status)
2332 goto out;
2333 }
2334 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2335 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2336 if (status == nfserr_resource)
2337 goto out_resource;
2338 if (status)
2339 goto out;
2340 }
2341 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2342 if ((buflen -= 8) < 0)
2343 goto out_resource;
2344 WRITE32((u32) MAJOR(stat.rdev));
2345 WRITE32((u32) MINOR(stat.rdev));
2346 }
2347 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2348 if ((buflen -= 8) < 0)
2349 goto out_resource;
2350 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2351 WRITE64(dummy64);
2352 }
2353 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2354 if ((buflen -= 8) < 0)
2355 goto out_resource;
2356 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2357 WRITE64(dummy64);
2358 }
2359 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2360 if ((buflen -= 8) < 0)
2361 goto out_resource;
2362 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2363 WRITE64(dummy64);
2364 }
2365 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2366 if ((buflen -= 8) < 0)
2367 goto out_resource;
2368 dummy64 = (u64)stat.blocks << 9;
2369 WRITE64(dummy64);
2370 }
2371 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2372 if ((buflen -= 12) < 0)
2373 goto out_resource;
2374 WRITE32(0);
2375 WRITE32(stat.atime.tv_sec);
2376 WRITE32(stat.atime.tv_nsec);
2377 }
2378 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2379 if ((buflen -= 12) < 0)
2380 goto out_resource;
2381 WRITE32(0);
2382 WRITE32(1);
2383 WRITE32(0);
2384 }
2385 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2386 if ((buflen -= 12) < 0)
2387 goto out_resource;
2388 WRITE32(0);
2389 WRITE32(stat.ctime.tv_sec);
2390 WRITE32(stat.ctime.tv_nsec);
2391 }
2392 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2393 if ((buflen -= 12) < 0)
2394 goto out_resource;
2395 WRITE32(0);
2396 WRITE32(stat.mtime.tv_sec);
2397 WRITE32(stat.mtime.tv_nsec);
2398 }
2399 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2400 if ((buflen -= 8) < 0)
2401 goto out_resource;
2402 /*
2403 * Get parent's attributes if not ignoring crossmount
2404 * and this is the root of a cross-mounted filesystem.
2405 */
2406 if (ignore_crossmnt == 0 &&
2407 dentry == exp->ex_path.mnt->mnt_root) {
2408 struct path path = exp->ex_path;
2409 path_get(&path);
2410 while (follow_up(&path)) {
2411 if (path.dentry != path.mnt->mnt_root)
2412 break;
2413 }
2414 err = vfs_getattr(path.mnt, path.dentry, &stat);
2415 path_put(&path);
2416 if (err)
2417 goto out_nfserr;
2418 }
2419 WRITE64(stat.ino);
2420 }
2421 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2422 WRITE32(3);
2423 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2424 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2425 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2426 }
2427
2428 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2429 *countp = p - buffer;
2430 status = nfs_ok;
2431
2432 out:
2433 kfree(acl);
2434 if (fhp == &tempfh)
2435 fh_put(&tempfh);
2436 return status;
2437 out_nfserr:
2438 status = nfserrno(err);
2439 goto out;
2440 out_resource:
2441 *countp = 0;
2442 status = nfserr_resource;
2443 goto out;
2444 out_serverfault:
2445 status = nfserr_serverfault;
2446 goto out;
2447 }
2448
2449 static inline int attributes_need_mount(u32 *bmval)
2450 {
2451 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2452 return 1;
2453 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2454 return 1;
2455 return 0;
2456 }
2457
2458 static __be32
2459 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2460 const char *name, int namlen, __be32 *p, int *buflen)
2461 {
2462 struct svc_export *exp = cd->rd_fhp->fh_export;
2463 struct dentry *dentry;
2464 __be32 nfserr;
2465 int ignore_crossmnt = 0;
2466
2467 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2468 if (IS_ERR(dentry))
2469 return nfserrno(PTR_ERR(dentry));
2470 if (!dentry->d_inode) {
2471 /*
2472 * nfsd_buffered_readdir drops the i_mutex between
2473 * readdir and calling this callback, leaving a window
2474 * where this directory entry could have gone away.
2475 */
2476 dput(dentry);
2477 return nfserr_noent;
2478 }
2479
2480 exp_get(exp);
2481 /*
2482 * In the case of a mountpoint, the client may be asking for
2483 * attributes that are only properties of the underlying filesystem
2484 * as opposed to the cross-mounted file system. In such a case,
2485 * we will not follow the cross mount and will fill the attribtutes
2486 * directly from the mountpoint dentry.
2487 */
2488 if (nfsd_mountpoint(dentry, exp)) {
2489 int err;
2490
2491 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2492 && !attributes_need_mount(cd->rd_bmval)) {
2493 ignore_crossmnt = 1;
2494 goto out_encode;
2495 }
2496 /*
2497 * Why the heck aren't we just using nfsd_lookup??
2498 * Different "."/".." handling? Something else?
2499 * At least, add a comment here to explain....
2500 */
2501 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2502 if (err) {
2503 nfserr = nfserrno(err);
2504 goto out_put;
2505 }
2506 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2507 if (nfserr)
2508 goto out_put;
2509
2510 }
2511 out_encode:
2512 nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2513 cd->rd_rqstp, ignore_crossmnt);
2514 out_put:
2515 dput(dentry);
2516 exp_put(exp);
2517 return nfserr;
2518 }
2519
2520 static __be32 *
2521 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2522 {
2523 __be32 *attrlenp;
2524
2525 if (buflen < 6)
2526 return NULL;
2527 *p++ = htonl(2);
2528 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2529 *p++ = htonl(0); /* bmval1 */
2530
2531 attrlenp = p++;
2532 *p++ = nfserr; /* no htonl */
2533 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2534 return p;
2535 }
2536
2537 static int
2538 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2539 loff_t offset, u64 ino, unsigned int d_type)
2540 {
2541 struct readdir_cd *ccd = ccdv;
2542 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2543 int buflen;
2544 __be32 *p = cd->buffer;
2545 __be32 *cookiep;
2546 __be32 nfserr = nfserr_toosmall;
2547
2548 /* In nfsv4, "." and ".." never make it onto the wire.. */
2549 if (name && isdotent(name, namlen)) {
2550 cd->common.err = nfs_ok;
2551 return 0;
2552 }
2553
2554 if (cd->offset)
2555 xdr_encode_hyper(cd->offset, (u64) offset);
2556
2557 buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2558 if (buflen < 0)
2559 goto fail;
2560
2561 *p++ = xdr_one; /* mark entry present */
2562 cookiep = p;
2563 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
2564 p = xdr_encode_array(p, name, namlen); /* name length & name */
2565
2566 nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2567 switch (nfserr) {
2568 case nfs_ok:
2569 p += buflen;
2570 break;
2571 case nfserr_resource:
2572 nfserr = nfserr_toosmall;
2573 goto fail;
2574 case nfserr_noent:
2575 goto skip_entry;
2576 default:
2577 /*
2578 * If the client requested the RDATTR_ERROR attribute,
2579 * we stuff the error code into this attribute
2580 * and continue. If this attribute was not requested,
2581 * then in accordance with the spec, we fail the
2582 * entire READDIR operation(!)
2583 */
2584 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2585 goto fail;
2586 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2587 if (p == NULL) {
2588 nfserr = nfserr_toosmall;
2589 goto fail;
2590 }
2591 }
2592 cd->buflen -= (p - cd->buffer);
2593 cd->buffer = p;
2594 cd->offset = cookiep;
2595 skip_entry:
2596 cd->common.err = nfs_ok;
2597 return 0;
2598 fail:
2599 cd->common.err = nfserr;
2600 return -EINVAL;
2601 }
2602
2603 static void
2604 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2605 {
2606 __be32 *p;
2607
2608 RESERVE_SPACE(sizeof(stateid_t));
2609 WRITE32(sid->si_generation);
2610 WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2611 ADJUST_ARGS();
2612 }
2613
2614 static __be32
2615 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2616 {
2617 __be32 *p;
2618
2619 if (!nfserr) {
2620 RESERVE_SPACE(8);
2621 WRITE32(access->ac_supported);
2622 WRITE32(access->ac_resp_access);
2623 ADJUST_ARGS();
2624 }
2625 return nfserr;
2626 }
2627
2628 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2629 {
2630 __be32 *p;
2631
2632 if (!nfserr) {
2633 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2634 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2635 WRITE32(bcts->dir);
2636 /* XXX: ? */
2637 WRITE32(0);
2638 ADJUST_ARGS();
2639 }
2640 return nfserr;
2641 }
2642
2643 static __be32
2644 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2645 {
2646 ENCODE_SEQID_OP_HEAD;
2647
2648 if (!nfserr)
2649 nfsd4_encode_stateid(resp, &close->cl_stateid);
2650
2651 encode_seqid_op_tail(resp, save, nfserr);
2652 return nfserr;
2653 }
2654
2655
2656 static __be32
2657 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2658 {
2659 __be32 *p;
2660
2661 if (!nfserr) {
2662 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2663 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2664 ADJUST_ARGS();
2665 }
2666 return nfserr;
2667 }
2668
2669 static __be32
2670 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2671 {
2672 __be32 *p;
2673
2674 if (!nfserr) {
2675 RESERVE_SPACE(32);
2676 write_cinfo(&p, &create->cr_cinfo);
2677 WRITE32(2);
2678 WRITE32(create->cr_bmval[0]);
2679 WRITE32(create->cr_bmval[1]);
2680 ADJUST_ARGS();
2681 }
2682 return nfserr;
2683 }
2684
2685 static __be32
2686 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2687 {
2688 struct svc_fh *fhp = getattr->ga_fhp;
2689 int buflen;
2690
2691 if (nfserr)
2692 return nfserr;
2693
2694 buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2695 nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2696 resp->p, &buflen, getattr->ga_bmval,
2697 resp->rqstp, 0);
2698 if (!nfserr)
2699 resp->p += buflen;
2700 return nfserr;
2701 }
2702
2703 static __be32
2704 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2705 {
2706 struct svc_fh *fhp = *fhpp;
2707 unsigned int len;
2708 __be32 *p;
2709
2710 if (!nfserr) {
2711 len = fhp->fh_handle.fh_size;
2712 RESERVE_SPACE(len + 4);
2713 WRITE32(len);
2714 WRITEMEM(&fhp->fh_handle.fh_base, len);
2715 ADJUST_ARGS();
2716 }
2717 return nfserr;
2718 }
2719
2720 /*
2721 * Including all fields other than the name, a LOCK4denied structure requires
2722 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2723 */
2724 static void
2725 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2726 {
2727 struct xdr_netobj *conf = &ld->ld_owner;
2728 __be32 *p;
2729
2730 RESERVE_SPACE(32 + XDR_LEN(conf->len));
2731 WRITE64(ld->ld_start);
2732 WRITE64(ld->ld_length);
2733 WRITE32(ld->ld_type);
2734 if (conf->len) {
2735 WRITEMEM(&ld->ld_clientid, 8);
2736 WRITE32(conf->len);
2737 WRITEMEM(conf->data, conf->len);
2738 kfree(conf->data);
2739 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
2740 WRITE64((u64)0); /* clientid */
2741 WRITE32(0); /* length of owner name */
2742 }
2743 ADJUST_ARGS();
2744 }
2745
2746 static __be32
2747 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2748 {
2749 ENCODE_SEQID_OP_HEAD;
2750
2751 if (!nfserr)
2752 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2753 else if (nfserr == nfserr_denied)
2754 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2755
2756 encode_seqid_op_tail(resp, save, nfserr);
2757 return nfserr;
2758 }
2759
2760 static __be32
2761 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2762 {
2763 if (nfserr == nfserr_denied)
2764 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2765 return nfserr;
2766 }
2767
2768 static __be32
2769 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2770 {
2771 ENCODE_SEQID_OP_HEAD;
2772
2773 if (!nfserr)
2774 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2775
2776 encode_seqid_op_tail(resp, save, nfserr);
2777 return nfserr;
2778 }
2779
2780
2781 static __be32
2782 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2783 {
2784 __be32 *p;
2785
2786 if (!nfserr) {
2787 RESERVE_SPACE(20);
2788 write_cinfo(&p, &link->li_cinfo);
2789 ADJUST_ARGS();
2790 }
2791 return nfserr;
2792 }
2793
2794
2795 static __be32
2796 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2797 {
2798 __be32 *p;
2799 ENCODE_SEQID_OP_HEAD;
2800
2801 if (nfserr)
2802 goto out;
2803
2804 nfsd4_encode_stateid(resp, &open->op_stateid);
2805 RESERVE_SPACE(40);
2806 write_cinfo(&p, &open->op_cinfo);
2807 WRITE32(open->op_rflags);
2808 WRITE32(2);
2809 WRITE32(open->op_bmval[0]);
2810 WRITE32(open->op_bmval[1]);
2811 WRITE32(open->op_delegate_type);
2812 ADJUST_ARGS();
2813
2814 switch (open->op_delegate_type) {
2815 case NFS4_OPEN_DELEGATE_NONE:
2816 break;
2817 case NFS4_OPEN_DELEGATE_READ:
2818 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2819 RESERVE_SPACE(20);
2820 WRITE32(open->op_recall);
2821
2822 /*
2823 * TODO: ACE's in delegations
2824 */
2825 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2826 WRITE32(0);
2827 WRITE32(0);
2828 WRITE32(0); /* XXX: is NULL principal ok? */
2829 ADJUST_ARGS();
2830 break;
2831 case NFS4_OPEN_DELEGATE_WRITE:
2832 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2833 RESERVE_SPACE(32);
2834 WRITE32(0);
2835
2836 /*
2837 * TODO: space_limit's in delegations
2838 */
2839 WRITE32(NFS4_LIMIT_SIZE);
2840 WRITE32(~(u32)0);
2841 WRITE32(~(u32)0);
2842
2843 /*
2844 * TODO: ACE's in delegations
2845 */
2846 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2847 WRITE32(0);
2848 WRITE32(0);
2849 WRITE32(0); /* XXX: is NULL principal ok? */
2850 ADJUST_ARGS();
2851 break;
2852 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2853 switch (open->op_why_no_deleg) {
2854 case WND4_CONTENTION:
2855 case WND4_RESOURCE:
2856 RESERVE_SPACE(8);
2857 WRITE32(open->op_why_no_deleg);
2858 WRITE32(0); /* deleg signaling not supported yet */
2859 break;
2860 default:
2861 RESERVE_SPACE(4);
2862 WRITE32(open->op_why_no_deleg);
2863 }
2864 ADJUST_ARGS();
2865 break;
2866 default:
2867 BUG();
2868 }
2869 /* XXX save filehandle here */
2870 out:
2871 encode_seqid_op_tail(resp, save, nfserr);
2872 return nfserr;
2873 }
2874
2875 static __be32
2876 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2877 {
2878 ENCODE_SEQID_OP_HEAD;
2879
2880 if (!nfserr)
2881 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2882
2883 encode_seqid_op_tail(resp, save, nfserr);
2884 return nfserr;
2885 }
2886
2887 static __be32
2888 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2889 {
2890 ENCODE_SEQID_OP_HEAD;
2891
2892 if (!nfserr)
2893 nfsd4_encode_stateid(resp, &od->od_stateid);
2894
2895 encode_seqid_op_tail(resp, save, nfserr);
2896 return nfserr;
2897 }
2898
2899 static __be32
2900 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2901 struct nfsd4_read *read)
2902 {
2903 u32 eof;
2904 int v, pn;
2905 unsigned long maxcount;
2906 long len;
2907 __be32 *p;
2908
2909 if (nfserr)
2910 return nfserr;
2911 if (resp->xbuf->page_len)
2912 return nfserr_resource;
2913
2914 RESERVE_SPACE(8); /* eof flag and byte count */
2915
2916 maxcount = svc_max_payload(resp->rqstp);
2917 if (maxcount > read->rd_length)
2918 maxcount = read->rd_length;
2919
2920 len = maxcount;
2921 v = 0;
2922 while (len > 0) {
2923 pn = resp->rqstp->rq_resused++;
2924 resp->rqstp->rq_vec[v].iov_base =
2925 page_address(resp->rqstp->rq_respages[pn]);
2926 resp->rqstp->rq_vec[v].iov_len =
2927 len < PAGE_SIZE ? len : PAGE_SIZE;
2928 v++;
2929 len -= PAGE_SIZE;
2930 }
2931 read->rd_vlen = v;
2932
2933 nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2934 read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2935 &maxcount);
2936
2937 if (nfserr)
2938 return nfserr;
2939 eof = (read->rd_offset + maxcount >=
2940 read->rd_fhp->fh_dentry->d_inode->i_size);
2941
2942 WRITE32(eof);
2943 WRITE32(maxcount);
2944 ADJUST_ARGS();
2945 resp->xbuf->head[0].iov_len = (char*)p
2946 - (char*)resp->xbuf->head[0].iov_base;
2947 resp->xbuf->page_len = maxcount;
2948
2949 /* Use rest of head for padding and remaining ops: */
2950 resp->xbuf->tail[0].iov_base = p;
2951 resp->xbuf->tail[0].iov_len = 0;
2952 if (maxcount&3) {
2953 RESERVE_SPACE(4);
2954 WRITE32(0);
2955 resp->xbuf->tail[0].iov_base += maxcount&3;
2956 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2957 ADJUST_ARGS();
2958 }
2959 return 0;
2960 }
2961
2962 static __be32
2963 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2964 {
2965 int maxcount;
2966 char *page;
2967 __be32 *p;
2968
2969 if (nfserr)
2970 return nfserr;
2971 if (resp->xbuf->page_len)
2972 return nfserr_resource;
2973
2974 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2975
2976 maxcount = PAGE_SIZE;
2977 RESERVE_SPACE(4);
2978
2979 /*
2980 * XXX: By default, the ->readlink() VFS op will truncate symlinks
2981 * if they would overflow the buffer. Is this kosher in NFSv4? If
2982 * not, one easy fix is: if ->readlink() precisely fills the buffer,
2983 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2984 */
2985 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2986 if (nfserr == nfserr_isdir)
2987 return nfserr_inval;
2988 if (nfserr)
2989 return nfserr;
2990
2991 WRITE32(maxcount);
2992 ADJUST_ARGS();
2993 resp->xbuf->head[0].iov_len = (char*)p
2994 - (char*)resp->xbuf->head[0].iov_base;
2995 resp->xbuf->page_len = maxcount;
2996
2997 /* Use rest of head for padding and remaining ops: */
2998 resp->xbuf->tail[0].iov_base = p;
2999 resp->xbuf->tail[0].iov_len = 0;
3000 if (maxcount&3) {
3001 RESERVE_SPACE(4);
3002 WRITE32(0);
3003 resp->xbuf->tail[0].iov_base += maxcount&3;
3004 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3005 ADJUST_ARGS();
3006 }
3007 return 0;
3008 }
3009
3010 static __be32
3011 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3012 {
3013 int maxcount;
3014 loff_t offset;
3015 __be32 *page, *savep, *tailbase;
3016 __be32 *p;
3017
3018 if (nfserr)
3019 return nfserr;
3020 if (resp->xbuf->page_len)
3021 return nfserr_resource;
3022
3023 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3024 savep = p;
3025
3026 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3027 WRITE32(0);
3028 WRITE32(0);
3029 ADJUST_ARGS();
3030 resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3031 tailbase = p;
3032
3033 maxcount = PAGE_SIZE;
3034 if (maxcount > readdir->rd_maxcount)
3035 maxcount = readdir->rd_maxcount;
3036
3037 /*
3038 * Convert from bytes to words, account for the two words already
3039 * written, make sure to leave two words at the end for the next
3040 * pointer and eof field.
3041 */
3042 maxcount = (maxcount >> 2) - 4;
3043 if (maxcount < 0) {
3044 nfserr = nfserr_toosmall;
3045 goto err_no_verf;
3046 }
3047
3048 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3049 readdir->common.err = 0;
3050 readdir->buflen = maxcount;
3051 readdir->buffer = page;
3052 readdir->offset = NULL;
3053
3054 offset = readdir->rd_cookie;
3055 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3056 &offset,
3057 &readdir->common, nfsd4_encode_dirent);
3058 if (nfserr == nfs_ok &&
3059 readdir->common.err == nfserr_toosmall &&
3060 readdir->buffer == page)
3061 nfserr = nfserr_toosmall;
3062 if (nfserr)
3063 goto err_no_verf;
3064
3065 if (readdir->offset)
3066 xdr_encode_hyper(readdir->offset, offset);
3067
3068 p = readdir->buffer;
3069 *p++ = 0; /* no more entries */
3070 *p++ = htonl(readdir->common.err == nfserr_eof);
3071 resp->xbuf->page_len = ((char*)p) - (char*)page_address(
3072 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
3073
3074 /* Use rest of head for padding and remaining ops: */
3075 resp->xbuf->tail[0].iov_base = tailbase;
3076 resp->xbuf->tail[0].iov_len = 0;
3077 resp->p = resp->xbuf->tail[0].iov_base;
3078 resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3079
3080 return 0;
3081 err_no_verf:
3082 p = savep;
3083 ADJUST_ARGS();
3084 return nfserr;
3085 }
3086
3087 static __be32
3088 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3089 {
3090 __be32 *p;
3091
3092 if (!nfserr) {
3093 RESERVE_SPACE(20);
3094 write_cinfo(&p, &remove->rm_cinfo);
3095 ADJUST_ARGS();
3096 }
3097 return nfserr;
3098 }
3099
3100 static __be32
3101 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3102 {
3103 __be32 *p;
3104
3105 if (!nfserr) {
3106 RESERVE_SPACE(40);
3107 write_cinfo(&p, &rename->rn_sinfo);
3108 write_cinfo(&p, &rename->rn_tinfo);
3109 ADJUST_ARGS();
3110 }
3111 return nfserr;
3112 }
3113
3114 static __be32
3115 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3116 __be32 nfserr,struct svc_export *exp)
3117 {
3118 int i = 0;
3119 u32 nflavs;
3120 struct exp_flavor_info *flavs;
3121 struct exp_flavor_info def_flavs[2];
3122 __be32 *p;
3123
3124 if (nfserr)
3125 goto out;
3126 if (exp->ex_nflavors) {
3127 flavs = exp->ex_flavors;
3128 nflavs = exp->ex_nflavors;
3129 } else { /* Handling of some defaults in absence of real secinfo: */
3130 flavs = def_flavs;
3131 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3132 nflavs = 2;
3133 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3134 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3135 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3136 nflavs = 1;
3137 flavs[0].pseudoflavor
3138 = svcauth_gss_flavor(exp->ex_client);
3139 } else {
3140 nflavs = 1;
3141 flavs[0].pseudoflavor
3142 = exp->ex_client->flavour->flavour;
3143 }
3144 }
3145
3146 RESERVE_SPACE(4);
3147 WRITE32(nflavs);
3148 ADJUST_ARGS();
3149 for (i = 0; i < nflavs; i++) {
3150 u32 flav = flavs[i].pseudoflavor;
3151 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
3152
3153 if (gm) {
3154 RESERVE_SPACE(4);
3155 WRITE32(RPC_AUTH_GSS);
3156 ADJUST_ARGS();
3157 RESERVE_SPACE(4 + gm->gm_oid.len);
3158 WRITE32(gm->gm_oid.len);
3159 WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
3160 ADJUST_ARGS();
3161 RESERVE_SPACE(4);
3162 WRITE32(0); /* qop */
3163 ADJUST_ARGS();
3164 RESERVE_SPACE(4);
3165 WRITE32(gss_pseudoflavor_to_service(gm, flav));
3166 ADJUST_ARGS();
3167 gss_mech_put(gm);
3168 } else {
3169 RESERVE_SPACE(4);
3170 WRITE32(flav);
3171 ADJUST_ARGS();
3172 }
3173 }
3174 out:
3175 if (exp)
3176 exp_put(exp);
3177 return nfserr;
3178 }
3179
3180 static __be32
3181 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3182 struct nfsd4_secinfo *secinfo)
3183 {
3184 return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3185 }
3186
3187 static __be32
3188 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3189 struct nfsd4_secinfo_no_name *secinfo)
3190 {
3191 return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3192 }
3193
3194 /*
3195 * The SETATTR encode routine is special -- it always encodes a bitmap,
3196 * regardless of the error status.
3197 */
3198 static __be32
3199 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3200 {
3201 __be32 *p;
3202
3203 RESERVE_SPACE(12);
3204 if (nfserr) {
3205 WRITE32(2);
3206 WRITE32(0);
3207 WRITE32(0);
3208 }
3209 else {
3210 WRITE32(2);
3211 WRITE32(setattr->sa_bmval[0]);
3212 WRITE32(setattr->sa_bmval[1]);
3213 }
3214 ADJUST_ARGS();
3215 return nfserr;
3216 }
3217
3218 static __be32
3219 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3220 {
3221 __be32 *p;
3222
3223 if (!nfserr) {
3224 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3225 WRITEMEM(&scd->se_clientid, 8);
3226 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3227 ADJUST_ARGS();
3228 }
3229 else if (nfserr == nfserr_clid_inuse) {
3230 RESERVE_SPACE(8);
3231 WRITE32(0);
3232 WRITE32(0);
3233 ADJUST_ARGS();
3234 }
3235 return nfserr;
3236 }
3237
3238 static __be32
3239 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3240 {
3241 __be32 *p;
3242
3243 if (!nfserr) {
3244 RESERVE_SPACE(16);
3245 WRITE32(write->wr_bytes_written);
3246 WRITE32(write->wr_how_written);
3247 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3248 ADJUST_ARGS();
3249 }
3250 return nfserr;
3251 }
3252
3253 static __be32
3254 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
3255 struct nfsd4_exchange_id *exid)
3256 {
3257 __be32 *p;
3258 char *major_id;
3259 char *server_scope;
3260 int major_id_sz;
3261 int server_scope_sz;
3262 uint64_t minor_id = 0;
3263
3264 if (nfserr)
3265 return nfserr;
3266
3267 major_id = utsname()->nodename;
3268 major_id_sz = strlen(major_id);
3269 server_scope = utsname()->nodename;
3270 server_scope_sz = strlen(server_scope);
3271
3272 RESERVE_SPACE(
3273 8 /* eir_clientid */ +
3274 4 /* eir_sequenceid */ +
3275 4 /* eir_flags */ +
3276 4 /* spr_how (SP4_NONE) */ +
3277 8 /* so_minor_id */ +
3278 4 /* so_major_id.len */ +
3279 (XDR_QUADLEN(major_id_sz) * 4) +
3280 4 /* eir_server_scope.len */ +
3281 (XDR_QUADLEN(server_scope_sz) * 4) +
3282 4 /* eir_server_impl_id.count (0) */);
3283
3284 WRITEMEM(&exid->clientid, 8);
3285 WRITE32(exid->seqid);
3286 WRITE32(exid->flags);
3287
3288 /* state_protect4_r. Currently only support SP4_NONE */
3289 BUG_ON(exid->spa_how != SP4_NONE);
3290 WRITE32(exid->spa_how);
3291
3292 /* The server_owner struct */
3293 WRITE64(minor_id); /* Minor id */
3294 /* major id */
3295 WRITE32(major_id_sz);
3296 WRITEMEM(major_id, major_id_sz);
3297
3298 /* Server scope */
3299 WRITE32(server_scope_sz);
3300 WRITEMEM(server_scope, server_scope_sz);
3301
3302 /* Implementation id */
3303 WRITE32(0); /* zero length nfs_impl_id4 array */
3304 ADJUST_ARGS();
3305 return 0;
3306 }
3307
3308 static __be32
3309 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3310 struct nfsd4_create_session *sess)
3311 {
3312 __be32 *p;
3313
3314 if (nfserr)
3315 return nfserr;
3316
3317 RESERVE_SPACE(24);
3318 WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3319 WRITE32(sess->seqid);
3320 WRITE32(sess->flags);
3321 ADJUST_ARGS();
3322
3323 RESERVE_SPACE(28);
3324 WRITE32(0); /* headerpadsz */
3325 WRITE32(sess->fore_channel.maxreq_sz);
3326 WRITE32(sess->fore_channel.maxresp_sz);
3327 WRITE32(sess->fore_channel.maxresp_cached);
3328 WRITE32(sess->fore_channel.maxops);
3329 WRITE32(sess->fore_channel.maxreqs);
3330 WRITE32(sess->fore_channel.nr_rdma_attrs);
3331 ADJUST_ARGS();
3332
3333 if (sess->fore_channel.nr_rdma_attrs) {
3334 RESERVE_SPACE(4);
3335 WRITE32(sess->fore_channel.rdma_attrs);
3336 ADJUST_ARGS();
3337 }
3338
3339 RESERVE_SPACE(28);
3340 WRITE32(0); /* headerpadsz */
3341 WRITE32(sess->back_channel.maxreq_sz);
3342 WRITE32(sess->back_channel.maxresp_sz);
3343 WRITE32(sess->back_channel.maxresp_cached);
3344 WRITE32(sess->back_channel.maxops);
3345 WRITE32(sess->back_channel.maxreqs);
3346 WRITE32(sess->back_channel.nr_rdma_attrs);
3347 ADJUST_ARGS();
3348
3349 if (sess->back_channel.nr_rdma_attrs) {
3350 RESERVE_SPACE(4);
3351 WRITE32(sess->back_channel.rdma_attrs);
3352 ADJUST_ARGS();
3353 }
3354 return 0;
3355 }
3356
3357 static __be32
3358 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3359 struct nfsd4_destroy_session *destroy_session)
3360 {
3361 return nfserr;
3362 }
3363
3364 static __be32
3365 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, int nfserr,
3366 struct nfsd4_free_stateid *free_stateid)
3367 {
3368 __be32 *p;
3369
3370 if (nfserr)
3371 return nfserr;
3372
3373 RESERVE_SPACE(4);
3374 WRITE32(nfserr);
3375 ADJUST_ARGS();
3376 return nfserr;
3377 }
3378
3379 static __be32
3380 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3381 struct nfsd4_sequence *seq)
3382 {
3383 __be32 *p;
3384
3385 if (nfserr)
3386 return nfserr;
3387
3388 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3389 WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3390 WRITE32(seq->seqid);
3391 WRITE32(seq->slotid);
3392 /* Note slotid's are numbered from zero: */
3393 WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3394 WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3395 WRITE32(seq->status_flags);
3396
3397 ADJUST_ARGS();
3398 resp->cstate.datap = p; /* DRC cache data pointer */
3399 return 0;
3400 }
3401
3402 __be32
3403 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, int nfserr,
3404 struct nfsd4_test_stateid *test_stateid)
3405 {
3406 struct nfsd4_test_stateid_id *stateid, *next;
3407 __be32 *p;
3408
3409 RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3410 *p++ = htonl(test_stateid->ts_num_ids);
3411
3412 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3413 *p++ = stateid->ts_id_status;
3414 }
3415
3416 ADJUST_ARGS();
3417 return nfserr;
3418 }
3419
3420 static __be32
3421 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3422 {
3423 return nfserr;
3424 }
3425
3426 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3427
3428 /*
3429 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3430 * since we don't need to filter out obsolete ops as this is
3431 * done in the decoding phase.
3432 */
3433 static nfsd4_enc nfsd4_enc_ops[] = {
3434 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
3435 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
3436 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
3437 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
3438 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
3439 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3440 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
3441 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
3442 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
3443 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
3444 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
3445 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
3446 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
3447 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
3448 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3449 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
3450 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
3451 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
3452 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
3453 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
3454 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
3455 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
3456 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
3457 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
3458 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
3459 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
3460 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
3461 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
3462 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
3463 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
3464 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
3465 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
3466 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
3467 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3468 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3469 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
3470 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
3471
3472 /* NFSv4.1 operations */
3473 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
3474 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3475 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
3476 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
3477 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_destroy_session,
3478 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_free_stateid,
3479 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3480 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
3481 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
3482 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
3483 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
3484 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3485 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3486 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
3487 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
3488 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
3489 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3490 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
3491 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
3492 };
3493
3494 /*
3495 * Calculate the total amount of memory that the compound response has taken
3496 * after encoding the current operation with pad.
3497 *
3498 * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3499 * which was specified at nfsd4_operation, else pad is zero.
3500 *
3501 * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3502 *
3503 * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3504 * will be at least a page and will therefore hold the xdr_buf head.
3505 */
3506 int nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3507 {
3508 struct xdr_buf *xb = &resp->rqstp->rq_res;
3509 struct nfsd4_session *session = NULL;
3510 struct nfsd4_slot *slot = resp->cstate.slot;
3511 u32 length, tlen = 0;
3512
3513 if (!nfsd4_has_session(&resp->cstate))
3514 return 0;
3515
3516 session = resp->cstate.session;
3517 if (session == NULL)
3518 return 0;
3519
3520 if (xb->page_len == 0) {
3521 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3522 } else {
3523 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3524 tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3525
3526 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3527 }
3528 dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3529 length, xb->page_len, tlen, pad);
3530
3531 if (length > session->se_fchannel.maxresp_sz)
3532 return nfserr_rep_too_big;
3533
3534 if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3535 length > session->se_fchannel.maxresp_cached)
3536 return nfserr_rep_too_big_to_cache;
3537
3538 return 0;
3539 }
3540
3541 void
3542 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3543 {
3544 __be32 *statp;
3545 __be32 *p;
3546
3547 RESERVE_SPACE(8);
3548 WRITE32(op->opnum);
3549 statp = p++; /* to be backfilled at the end */
3550 ADJUST_ARGS();
3551
3552 if (op->opnum == OP_ILLEGAL)
3553 goto status;
3554 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3555 !nfsd4_enc_ops[op->opnum]);
3556 op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3557 /* nfsd4_check_drc_limit guarantees enough room for error status */
3558 if (!op->status)
3559 op->status = nfsd4_check_resp_size(resp, 0);
3560 status:
3561 /*
3562 * Note: We write the status directly, instead of using WRITE32(),
3563 * since it is already in network byte order.
3564 */
3565 *statp = op->status;
3566 }
3567
3568 /*
3569 * Encode the reply stored in the stateowner reply cache
3570 *
3571 * XDR note: do not encode rp->rp_buflen: the buffer contains the
3572 * previously sent already encoded operation.
3573 *
3574 * called with nfs4_lock_state() held
3575 */
3576 void
3577 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3578 {
3579 __be32 *p;
3580 struct nfs4_replay *rp = op->replay;
3581
3582 BUG_ON(!rp);
3583
3584 RESERVE_SPACE(8);
3585 WRITE32(op->opnum);
3586 *p++ = rp->rp_status; /* already xdr'ed */
3587 ADJUST_ARGS();
3588
3589 RESERVE_SPACE(rp->rp_buflen);
3590 WRITEMEM(rp->rp_buf, rp->rp_buflen);
3591 ADJUST_ARGS();
3592 }
3593
3594 int
3595 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3596 {
3597 return xdr_ressize_check(rqstp, p);
3598 }
3599
3600 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3601 {
3602 struct svc_rqst *rqstp = rq;
3603 struct nfsd4_compoundargs *args = rqstp->rq_argp;
3604
3605 if (args->ops != args->iops) {
3606 kfree(args->ops);
3607 args->ops = args->iops;
3608 }
3609 kfree(args->tmpp);
3610 args->tmpp = NULL;
3611 while (args->to_free) {
3612 struct tmpbuf *tb = args->to_free;
3613 args->to_free = tb->next;
3614 tb->release(tb->buf);
3615 kfree(tb);
3616 }
3617 return 1;
3618 }
3619
3620 int
3621 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3622 {
3623 args->p = p;
3624 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3625 args->pagelist = rqstp->rq_arg.pages;
3626 args->pagelen = rqstp->rq_arg.page_len;
3627 args->tmpp = NULL;
3628 args->to_free = NULL;
3629 args->ops = args->iops;
3630 args->rqstp = rqstp;
3631
3632 return !nfsd4_decode_compound(args);
3633 }
3634
3635 int
3636 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3637 {
3638 /*
3639 * All that remains is to write the tag and operation count...
3640 */
3641 struct nfsd4_compound_state *cs = &resp->cstate;
3642 struct kvec *iov;
3643 p = resp->tagp;
3644 *p++ = htonl(resp->taglen);
3645 memcpy(p, resp->tag, resp->taglen);
3646 p += XDR_QUADLEN(resp->taglen);
3647 *p++ = htonl(resp->opcnt);
3648
3649 if (rqstp->rq_res.page_len)
3650 iov = &rqstp->rq_res.tail[0];
3651 else
3652 iov = &rqstp->rq_res.head[0];
3653 iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3654 BUG_ON(iov->iov_len > PAGE_SIZE);
3655 if (nfsd4_has_session(cs)) {
3656 if (cs->status != nfserr_replay_cache) {
3657 nfsd4_store_cache_entry(resp);
3658 cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3659 }
3660 /* Renew the clientid on success and on replay */
3661 release_session_client(cs->session);
3662 nfsd4_put_session(cs->session);
3663 }
3664 return 1;
3665 }
3666
3667 /*
3668 * Local variables:
3669 * c-basic-offset: 8
3670 * End:
3671 */
Linux with added FPC-III support