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[PATCH] knfsd: Avoid excess stack usage in svc_tcp_recvfrom
[usb.git] / fs / nfsd / nfs4xdr.c
blobdf341956254eabc38fed4ce62f85e1e49e0c8ced
1 /*
2 * fs/nfs/nfs4xdr.c
3 *
4 * Server-side XDR for NFSv4
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * TODO: Neil Brown made the following observation: We currently
38 * initially reserve NFSD_BUFSIZE space on the transmit queue and
39 * never release any of that until the request is complete.
40 * It would be good to calculate a new maximum response size while
41 * decoding the COMPOUND, and call svc_reserve with this number
42 * at the end of nfs4svc_decode_compoundargs.
43 */
44
45 #include <linux/param.h>
46 #include <linux/smp.h>
47 #include <linux/smp_lock.h>
48 #include <linux/fs.h>
49 #include <linux/namei.h>
50 #include <linux/vfs.h>
51 #include <linux/sunrpc/xdr.h>
52 #include <linux/sunrpc/svc.h>
53 #include <linux/sunrpc/clnt.h>
54 #include <linux/nfsd/nfsd.h>
55 #include <linux/nfsd/state.h>
56 #include <linux/nfsd/xdr4.h>
57 #include <linux/nfsd_idmap.h>
58 #include <linux/nfs4.h>
59 #include <linux/nfs4_acl.h>
60
61 #define NFSDDBG_FACILITY NFSDDBG_XDR
62
63 static int
64 check_filename(char *str, int len, int err)
65 {
66 int i;
67
68 if (len == 0)
69 return nfserr_inval;
70 if (isdotent(str, len))
71 return err;
72 for (i = 0; i < len; i++)
73 if (str[i] == '/')
74 return err;
75 return 0;
76 }
77
78 /*
79 * START OF "GENERIC" DECODE ROUTINES.
80 * These may look a little ugly since they are imported from a "generic"
81 * set of XDR encode/decode routines which are intended to be shared by
82 * all of our NFSv4 implementations (OpenBSD, MacOS X...).
83 *
84 * If the pain of reading these is too great, it should be a straightforward
85 * task to translate them into Linux-specific versions which are more
86 * consistent with the style used in NFSv2/v3...
87 */
88 #define DECODE_HEAD \
89 u32 *p; \
90 int status
91 #define DECODE_TAIL \
92 status = 0; \
93 out: \
94 return status; \
95 xdr_error: \
96 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
97 status = nfserr_bad_xdr; \
98 goto out
99
100 #define READ32(x) (x) = ntohl(*p++)
101 #define READ64(x) do { \
102 (x) = (u64)ntohl(*p++) << 32; \
103 (x) |= ntohl(*p++); \
104 } while (0)
105 #define READTIME(x) do { \
106 p++; \
107 (x) = ntohl(*p++); \
108 p++; \
109 } while (0)
110 #define READMEM(x,nbytes) do { \
111 x = (char *)p; \
112 p += XDR_QUADLEN(nbytes); \
113 } while (0)
114 #define SAVEMEM(x,nbytes) do { \
115 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
116 savemem(argp, p, nbytes) : \
117 (char *)p)) { \
118 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
119 goto xdr_error; \
120 } \
121 p += XDR_QUADLEN(nbytes); \
122 } while (0)
123 #define COPYMEM(x,nbytes) do { \
124 memcpy((x), p, nbytes); \
125 p += XDR_QUADLEN(nbytes); \
126 } while (0)
127
128 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
129 #define READ_BUF(nbytes) do { \
130 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
131 p = argp->p; \
132 argp->p += XDR_QUADLEN(nbytes); \
133 } else if (!(p = read_buf(argp, nbytes))) { \
134 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
135 goto xdr_error; \
136 } \
137 } while (0)
138
139 static u32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
140 {
141 /* We want more bytes than seem to be available.
142 * Maybe we need a new page, maybe we have just run out
143 */
144 int avail = (char*)argp->end - (char*)argp->p;
145 u32 *p;
146 if (avail + argp->pagelen < nbytes)
147 return NULL;
148 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
149 return NULL;
150 /* ok, we can do it with the current plus the next page */
151 if (nbytes <= sizeof(argp->tmp))
152 p = argp->tmp;
153 else {
154 kfree(argp->tmpp);
155 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
156 if (!p)
157 return NULL;
158
159 }
160 memcpy(p, argp->p, avail);
161 /* step to next page */
162 argp->p = page_address(argp->pagelist[0]);
163 argp->pagelist++;
164 if (argp->pagelen < PAGE_SIZE) {
165 argp->end = p + (argp->pagelen>>2);
166 argp->pagelen = 0;
167 } else {
168 argp->end = p + (PAGE_SIZE>>2);
169 argp->pagelen -= PAGE_SIZE;
170 }
171 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
172 argp->p += XDR_QUADLEN(nbytes - avail);
173 return p;
174 }
175
176 static int
177 defer_free(struct nfsd4_compoundargs *argp,
178 void (*release)(const void *), void *p)
179 {
180 struct tmpbuf *tb;
181
182 tb = kmalloc(sizeof(*tb), GFP_KERNEL);
183 if (!tb)
184 return -ENOMEM;
185 tb->buf = p;
186 tb->release = release;
187 tb->next = argp->to_free;
188 argp->to_free = tb;
189 return 0;
190 }
191
192 static char *savemem(struct nfsd4_compoundargs *argp, u32 *p, int nbytes)
193 {
194 void *new = NULL;
195 if (p == argp->tmp) {
196 new = kmalloc(nbytes, GFP_KERNEL);
197 if (!new) return NULL;
198 p = new;
199 memcpy(p, argp->tmp, nbytes);
200 } else {
201 BUG_ON(p != argp->tmpp);
202 argp->tmpp = NULL;
203 }
204 if (defer_free(argp, kfree, p)) {
205 kfree(new);
206 return NULL;
207 } else
208 return (char *)p;
209 }
210
211
212 static int
213 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
214 {
215 u32 bmlen;
216 DECODE_HEAD;
217
218 bmval[0] = 0;
219 bmval[1] = 0;
220
221 READ_BUF(4);
222 READ32(bmlen);
223 if (bmlen > 1000)
224 goto xdr_error;
225
226 READ_BUF(bmlen << 2);
227 if (bmlen > 0)
228 READ32(bmval[0]);
229 if (bmlen > 1)
230 READ32(bmval[1]);
231
232 DECODE_TAIL;
233 }
234
235 static int
236 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, struct iattr *iattr,
237 struct nfs4_acl **acl)
238 {
239 int expected_len, len = 0;
240 u32 dummy32;
241 char *buf;
242
243 DECODE_HEAD;
244 iattr->ia_valid = 0;
245 if ((status = nfsd4_decode_bitmap(argp, bmval)))
246 return status;
247
248 /*
249 * According to spec, unsupported attributes return ERR_NOTSUPP;
250 * read-only attributes return ERR_INVAL.
251 */
252 if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
253 return nfserr_attrnotsupp;
254 if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
255 return nfserr_inval;
256
257 READ_BUF(4);
258 READ32(expected_len);
259
260 if (bmval[0] & FATTR4_WORD0_SIZE) {
261 READ_BUF(8);
262 len += 8;
263 READ64(iattr->ia_size);
264 iattr->ia_valid |= ATTR_SIZE;
265 }
266 if (bmval[0] & FATTR4_WORD0_ACL) {
267 int nace, i;
268 struct nfs4_ace ace;
269
270 READ_BUF(4); len += 4;
271 READ32(nace);
272
273 *acl = nfs4_acl_new();
274 if (*acl == NULL) {
275 status = -ENOMEM;
276 goto out_nfserr;
277 }
278 defer_free(argp, (void (*)(const void *))nfs4_acl_free, *acl);
279
280 for (i = 0; i < nace; i++) {
281 READ_BUF(16); len += 16;
282 READ32(ace.type);
283 READ32(ace.flag);
284 READ32(ace.access_mask);
285 READ32(dummy32);
286 READ_BUF(dummy32);
287 len += XDR_QUADLEN(dummy32) << 2;
288 READMEM(buf, dummy32);
289 ace.whotype = nfs4_acl_get_whotype(buf, dummy32);
290 status = 0;
291 if (ace.whotype != NFS4_ACL_WHO_NAMED)
292 ace.who = 0;
293 else if (ace.flag & NFS4_ACE_IDENTIFIER_GROUP)
294 status = nfsd_map_name_to_gid(argp->rqstp,
295 buf, dummy32, &ace.who);
296 else
297 status = nfsd_map_name_to_uid(argp->rqstp,
298 buf, dummy32, &ace.who);
299 if (status)
300 goto out_nfserr;
301 status = nfs4_acl_add_ace(*acl, ace.type, ace.flag,
302 ace.access_mask, ace.whotype, ace.who);
303 if (status)
304 goto out_nfserr;
305 }
306 } else
307 *acl = NULL;
308 if (bmval[1] & FATTR4_WORD1_MODE) {
309 READ_BUF(4);
310 len += 4;
311 READ32(iattr->ia_mode);
312 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
313 iattr->ia_valid |= ATTR_MODE;
314 }
315 if (bmval[1] & FATTR4_WORD1_OWNER) {
316 READ_BUF(4);
317 len += 4;
318 READ32(dummy32);
319 READ_BUF(dummy32);
320 len += (XDR_QUADLEN(dummy32) << 2);
321 READMEM(buf, dummy32);
322 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
323 goto out_nfserr;
324 iattr->ia_valid |= ATTR_UID;
325 }
326 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
327 READ_BUF(4);
328 len += 4;
329 READ32(dummy32);
330 READ_BUF(dummy32);
331 len += (XDR_QUADLEN(dummy32) << 2);
332 READMEM(buf, dummy32);
333 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
334 goto out_nfserr;
335 iattr->ia_valid |= ATTR_GID;
336 }
337 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
338 READ_BUF(4);
339 len += 4;
340 READ32(dummy32);
341 switch (dummy32) {
342 case NFS4_SET_TO_CLIENT_TIME:
343 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
344 all 32 bits of 'nseconds'. */
345 READ_BUF(12);
346 len += 12;
347 READ32(dummy32);
348 if (dummy32)
349 return nfserr_inval;
350 READ32(iattr->ia_atime.tv_sec);
351 READ32(iattr->ia_atime.tv_nsec);
352 if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
353 return nfserr_inval;
354 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
355 break;
356 case NFS4_SET_TO_SERVER_TIME:
357 iattr->ia_valid |= ATTR_ATIME;
358 break;
359 default:
360 goto xdr_error;
361 }
362 }
363 if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
364 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
365 all 32 bits of 'nseconds'. */
366 READ_BUF(12);
367 len += 12;
368 READ32(dummy32);
369 if (dummy32)
370 return nfserr_inval;
371 READ32(iattr->ia_ctime.tv_sec);
372 READ32(iattr->ia_ctime.tv_nsec);
373 if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
374 return nfserr_inval;
375 iattr->ia_valid |= ATTR_CTIME;
376 }
377 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
378 READ_BUF(4);
379 len += 4;
380 READ32(dummy32);
381 switch (dummy32) {
382 case NFS4_SET_TO_CLIENT_TIME:
383 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
384 all 32 bits of 'nseconds'. */
385 READ_BUF(12);
386 len += 12;
387 READ32(dummy32);
388 if (dummy32)
389 return nfserr_inval;
390 READ32(iattr->ia_mtime.tv_sec);
391 READ32(iattr->ia_mtime.tv_nsec);
392 if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
393 return nfserr_inval;
394 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
395 break;
396 case NFS4_SET_TO_SERVER_TIME:
397 iattr->ia_valid |= ATTR_MTIME;
398 break;
399 default:
400 goto xdr_error;
401 }
402 }
403 if (len != expected_len)
404 goto xdr_error;
405
406 DECODE_TAIL;
407
408 out_nfserr:
409 status = nfserrno(status);
410 goto out;
411 }
412
413 static int
414 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
415 {
416 DECODE_HEAD;
417
418 READ_BUF(4);
419 READ32(access->ac_req_access);
420
421 DECODE_TAIL;
422 }
423
424 static int
425 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
426 {
427 DECODE_HEAD;
428
429 close->cl_stateowner = NULL;
430 READ_BUF(4 + sizeof(stateid_t));
431 READ32(close->cl_seqid);
432 READ32(close->cl_stateid.si_generation);
433 COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
434
435 DECODE_TAIL;
436 }
437
438
439 static int
440 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
441 {
442 DECODE_HEAD;
443
444 READ_BUF(12);
445 READ64(commit->co_offset);
446 READ32(commit->co_count);
447
448 DECODE_TAIL;
449 }
450
451 static int
452 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
453 {
454 DECODE_HEAD;
455
456 READ_BUF(4);
457 READ32(create->cr_type);
458 switch (create->cr_type) {
459 case NF4LNK:
460 READ_BUF(4);
461 READ32(create->cr_linklen);
462 READ_BUF(create->cr_linklen);
463 SAVEMEM(create->cr_linkname, create->cr_linklen);
464 break;
465 case NF4BLK:
466 case NF4CHR:
467 READ_BUF(8);
468 READ32(create->cr_specdata1);
469 READ32(create->cr_specdata2);
470 break;
471 case NF4SOCK:
472 case NF4FIFO:
473 case NF4DIR:
474 default:
475 break;
476 }
477
478 READ_BUF(4);
479 READ32(create->cr_namelen);
480 READ_BUF(create->cr_namelen);
481 SAVEMEM(create->cr_name, create->cr_namelen);
482 if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
483 return status;
484
485 if ((status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, &create->cr_acl)))
486 goto out;
487
488 DECODE_TAIL;
489 }
490
491 static inline int
492 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
493 {
494 DECODE_HEAD;
495
496 READ_BUF(sizeof(stateid_t));
497 READ32(dr->dr_stateid.si_generation);
498 COPYMEM(&dr->dr_stateid.si_opaque, sizeof(stateid_opaque_t));
499
500 DECODE_TAIL;
501 }
502
503 static inline int
504 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
505 {
506 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
507 }
508
509 static int
510 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
511 {
512 DECODE_HEAD;
513
514 READ_BUF(4);
515 READ32(link->li_namelen);
516 READ_BUF(link->li_namelen);
517 SAVEMEM(link->li_name, link->li_namelen);
518 if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
519 return status;
520
521 DECODE_TAIL;
522 }
523
524 static int
525 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
526 {
527 DECODE_HEAD;
528
529 lock->lk_replay_owner = NULL;
530 /*
531 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
532 */
533 READ_BUF(28);
534 READ32(lock->lk_type);
535 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
536 goto xdr_error;
537 READ32(lock->lk_reclaim);
538 READ64(lock->lk_offset);
539 READ64(lock->lk_length);
540 READ32(lock->lk_is_new);
541
542 if (lock->lk_is_new) {
543 READ_BUF(36);
544 READ32(lock->lk_new_open_seqid);
545 READ32(lock->lk_new_open_stateid.si_generation);
546
547 COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
548 READ32(lock->lk_new_lock_seqid);
549 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
550 READ32(lock->lk_new_owner.len);
551 READ_BUF(lock->lk_new_owner.len);
552 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
553 } else {
554 READ_BUF(20);
555 READ32(lock->lk_old_lock_stateid.si_generation);
556 COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
557 READ32(lock->lk_old_lock_seqid);
558 }
559
560 DECODE_TAIL;
561 }
562
563 static int
564 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
565 {
566 DECODE_HEAD;
567
568 READ_BUF(32);
569 READ32(lockt->lt_type);
570 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
571 goto xdr_error;
572 READ64(lockt->lt_offset);
573 READ64(lockt->lt_length);
574 COPYMEM(&lockt->lt_clientid, 8);
575 READ32(lockt->lt_owner.len);
576 READ_BUF(lockt->lt_owner.len);
577 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
578
579 DECODE_TAIL;
580 }
581
582 static int
583 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
584 {
585 DECODE_HEAD;
586
587 locku->lu_stateowner = NULL;
588 READ_BUF(24 + sizeof(stateid_t));
589 READ32(locku->lu_type);
590 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
591 goto xdr_error;
592 READ32(locku->lu_seqid);
593 READ32(locku->lu_stateid.si_generation);
594 COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
595 READ64(locku->lu_offset);
596 READ64(locku->lu_length);
597
598 DECODE_TAIL;
599 }
600
601 static int
602 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
603 {
604 DECODE_HEAD;
605
606 READ_BUF(4);
607 READ32(lookup->lo_len);
608 READ_BUF(lookup->lo_len);
609 SAVEMEM(lookup->lo_name, lookup->lo_len);
610 if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
611 return status;
612
613 DECODE_TAIL;
614 }
615
616 static int
617 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
618 {
619 DECODE_HEAD;
620
621 memset(open->op_bmval, 0, sizeof(open->op_bmval));
622 open->op_iattr.ia_valid = 0;
623 open->op_stateowner = NULL;
624
625 /* seqid, share_access, share_deny, clientid, ownerlen */
626 READ_BUF(16 + sizeof(clientid_t));
627 READ32(open->op_seqid);
628 READ32(open->op_share_access);
629 READ32(open->op_share_deny);
630 COPYMEM(&open->op_clientid, sizeof(clientid_t));
631 READ32(open->op_owner.len);
632
633 /* owner, open_flag */
634 READ_BUF(open->op_owner.len + 4);
635 SAVEMEM(open->op_owner.data, open->op_owner.len);
636 READ32(open->op_create);
637 switch (open->op_create) {
638 case NFS4_OPEN_NOCREATE:
639 break;
640 case NFS4_OPEN_CREATE:
641 READ_BUF(4);
642 READ32(open->op_createmode);
643 switch (open->op_createmode) {
644 case NFS4_CREATE_UNCHECKED:
645 case NFS4_CREATE_GUARDED:
646 if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
647 goto out;
648 break;
649 case NFS4_CREATE_EXCLUSIVE:
650 READ_BUF(8);
651 COPYMEM(open->op_verf.data, 8);
652 break;
653 default:
654 goto xdr_error;
655 }
656 break;
657 default:
658 goto xdr_error;
659 }
660
661 /* open_claim */
662 READ_BUF(4);
663 READ32(open->op_claim_type);
664 switch (open->op_claim_type) {
665 case NFS4_OPEN_CLAIM_NULL:
666 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
667 READ_BUF(4);
668 READ32(open->op_fname.len);
669 READ_BUF(open->op_fname.len);
670 SAVEMEM(open->op_fname.data, open->op_fname.len);
671 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
672 return status;
673 break;
674 case NFS4_OPEN_CLAIM_PREVIOUS:
675 READ_BUF(4);
676 READ32(open->op_delegate_type);
677 break;
678 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
679 READ_BUF(sizeof(stateid_t) + 4);
680 COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
681 READ32(open->op_fname.len);
682 READ_BUF(open->op_fname.len);
683 SAVEMEM(open->op_fname.data, open->op_fname.len);
684 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
685 return status;
686 break;
687 default:
688 goto xdr_error;
689 }
690
691 DECODE_TAIL;
692 }
693
694 static int
695 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
696 {
697 DECODE_HEAD;
698
699 open_conf->oc_stateowner = NULL;
700 READ_BUF(4 + sizeof(stateid_t));
701 READ32(open_conf->oc_req_stateid.si_generation);
702 COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
703 READ32(open_conf->oc_seqid);
704
705 DECODE_TAIL;
706 }
707
708 static int
709 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
710 {
711 DECODE_HEAD;
712
713 open_down->od_stateowner = NULL;
714 READ_BUF(12 + sizeof(stateid_t));
715 READ32(open_down->od_stateid.si_generation);
716 COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
717 READ32(open_down->od_seqid);
718 READ32(open_down->od_share_access);
719 READ32(open_down->od_share_deny);
720
721 DECODE_TAIL;
722 }
723
724 static int
725 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
726 {
727 DECODE_HEAD;
728
729 READ_BUF(4);
730 READ32(putfh->pf_fhlen);
731 if (putfh->pf_fhlen > NFS4_FHSIZE)
732 goto xdr_error;
733 READ_BUF(putfh->pf_fhlen);
734 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
735
736 DECODE_TAIL;
737 }
738
739 static int
740 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
741 {
742 DECODE_HEAD;
743
744 READ_BUF(sizeof(stateid_t) + 12);
745 READ32(read->rd_stateid.si_generation);
746 COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
747 READ64(read->rd_offset);
748 READ32(read->rd_length);
749
750 DECODE_TAIL;
751 }
752
753 static int
754 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
755 {
756 DECODE_HEAD;
757
758 READ_BUF(24);
759 READ64(readdir->rd_cookie);
760 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
761 READ32(readdir->rd_dircount); /* just in case you needed a useless field... */
762 READ32(readdir->rd_maxcount);
763 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
764 goto out;
765
766 DECODE_TAIL;
767 }
768
769 static int
770 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
771 {
772 DECODE_HEAD;
773
774 READ_BUF(4);
775 READ32(remove->rm_namelen);
776 READ_BUF(remove->rm_namelen);
777 SAVEMEM(remove->rm_name, remove->rm_namelen);
778 if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
779 return status;
780
781 DECODE_TAIL;
782 }
783
784 static int
785 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
786 {
787 DECODE_HEAD;
788
789 READ_BUF(4);
790 READ32(rename->rn_snamelen);
791 READ_BUF(rename->rn_snamelen + 4);
792 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
793 READ32(rename->rn_tnamelen);
794 READ_BUF(rename->rn_tnamelen);
795 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
796 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
797 return status;
798 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
799 return status;
800
801 DECODE_TAIL;
802 }
803
804 static int
805 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
806 {
807 DECODE_HEAD;
808
809 READ_BUF(sizeof(clientid_t));
810 COPYMEM(clientid, sizeof(clientid_t));
811
812 DECODE_TAIL;
813 }
814
815 static int
816 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
817 {
818 DECODE_HEAD;
819
820 READ_BUF(sizeof(stateid_t));
821 READ32(setattr->sa_stateid.si_generation);
822 COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
823 if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
824 goto out;
825
826 DECODE_TAIL;
827 }
828
829 static int
830 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
831 {
832 DECODE_HEAD;
833
834 READ_BUF(12);
835 COPYMEM(setclientid->se_verf.data, 8);
836 READ32(setclientid->se_namelen);
837
838 READ_BUF(setclientid->se_namelen + 8);
839 SAVEMEM(setclientid->se_name, setclientid->se_namelen);
840 READ32(setclientid->se_callback_prog);
841 READ32(setclientid->se_callback_netid_len);
842
843 READ_BUF(setclientid->se_callback_netid_len + 4);
844 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
845 READ32(setclientid->se_callback_addr_len);
846
847 READ_BUF(setclientid->se_callback_addr_len + 4);
848 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
849 READ32(setclientid->se_callback_ident);
850
851 DECODE_TAIL;
852 }
853
854 static int
855 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
856 {
857 DECODE_HEAD;
858
859 READ_BUF(8 + sizeof(nfs4_verifier));
860 COPYMEM(&scd_c->sc_clientid, 8);
861 COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
862
863 DECODE_TAIL;
864 }
865
866 /* Also used for NVERIFY */
867 static int
868 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
869 {
870 #if 0
871 struct nfsd4_compoundargs save = {
872 .p = argp->p,
873 .end = argp->end,
874 .rqstp = argp->rqstp,
875 };
876 u32 ve_bmval[2];
877 struct iattr ve_iattr; /* request */
878 struct nfs4_acl *ve_acl; /* request */
879 #endif
880 DECODE_HEAD;
881
882 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
883 goto out;
884
885 /* For convenience's sake, we compare raw xdr'd attributes in
886 * nfsd4_proc_verify; however we still decode here just to return
887 * correct error in case of bad xdr. */
888 #if 0
889 status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
890 if (status == nfserr_inval) {
891 status = nfserrno(status);
892 goto out;
893 }
894 #endif
895 READ_BUF(4);
896 READ32(verify->ve_attrlen);
897 READ_BUF(verify->ve_attrlen);
898 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
899
900 DECODE_TAIL;
901 }
902
903 static int
904 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
905 {
906 int avail;
907 int v;
908 int len;
909 DECODE_HEAD;
910
911 READ_BUF(sizeof(stateid_opaque_t) + 20);
912 READ32(write->wr_stateid.si_generation);
913 COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
914 READ64(write->wr_offset);
915 READ32(write->wr_stable_how);
916 if (write->wr_stable_how > 2)
917 goto xdr_error;
918 READ32(write->wr_buflen);
919
920 /* Sorry .. no magic macros for this.. *
921 * READ_BUF(write->wr_buflen);
922 * SAVEMEM(write->wr_buf, write->wr_buflen);
923 */
924 avail = (char*)argp->end - (char*)argp->p;
925 if (avail + argp->pagelen < write->wr_buflen) {
926 printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__);
927 goto xdr_error;
928 }
929 argp->rqstp->rq_vec[0].iov_base = p;
930 argp->rqstp->rq_vec[0].iov_len = avail;
931 v = 0;
932 len = write->wr_buflen;
933 while (len > argp->rqstp->rq_vec[v].iov_len) {
934 len -= argp->rqstp->rq_vec[v].iov_len;
935 v++;
936 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
937 argp->pagelist++;
938 if (argp->pagelen >= PAGE_SIZE) {
939 argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
940 argp->pagelen -= PAGE_SIZE;
941 } else {
942 argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
943 argp->pagelen -= len;
944 }
945 }
946 argp->end = (u32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
947 argp->p = (u32*) (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
948 argp->rqstp->rq_vec[v].iov_len = len;
949 write->wr_vlen = v+1;
950
951 DECODE_TAIL;
952 }
953
954 static int
955 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
956 {
957 DECODE_HEAD;
958
959 READ_BUF(12);
960 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
961 READ32(rlockowner->rl_owner.len);
962 READ_BUF(rlockowner->rl_owner.len);
963 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
964
965 DECODE_TAIL;
966 }
967
968 static int
969 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
970 {
971 DECODE_HEAD;
972 struct nfsd4_op *op;
973 int i;
974
975 /*
976 * XXX: According to spec, we should check the tag
977 * for UTF-8 compliance. I'm postponing this for
978 * now because it seems that some clients do use
979 * binary tags.
980 */
981 READ_BUF(4);
982 READ32(argp->taglen);
983 READ_BUF(argp->taglen + 8);
984 SAVEMEM(argp->tag, argp->taglen);
985 READ32(argp->minorversion);
986 READ32(argp->opcnt);
987
988 if (argp->taglen > NFSD4_MAX_TAGLEN)
989 goto xdr_error;
990 if (argp->opcnt > 100)
991 goto xdr_error;
992
993 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
994 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
995 if (!argp->ops) {
996 argp->ops = argp->iops;
997 printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
998 goto xdr_error;
999 }
1000 }
1001
1002 for (i = 0; i < argp->opcnt; i++) {
1003 op = &argp->ops[i];
1004 op->replay = NULL;
1005
1006 /*
1007 * We can't use READ_BUF() here because we need to handle
1008 * a missing opcode as an OP_WRITE + 1. So we need to check
1009 * to see if we're truly at the end of our buffer or if there
1010 * is another page we need to flip to.
1011 */
1012
1013 if (argp->p == argp->end) {
1014 if (argp->pagelen < 4) {
1015 /* There isn't an opcode still on the wire */
1016 op->opnum = OP_WRITE + 1;
1017 op->status = nfserr_bad_xdr;
1018 argp->opcnt = i+1;
1019 break;
1020 }
1021
1022 /*
1023 * False alarm. We just hit a page boundary, but there
1024 * is still data available. Move pointer across page
1025 * boundary. *snip from READ_BUF*
1026 */
1027 argp->p = page_address(argp->pagelist[0]);
1028 argp->pagelist++;
1029 if (argp->pagelen < PAGE_SIZE) {
1030 argp->end = p + (argp->pagelen>>2);
1031 argp->pagelen = 0;
1032 } else {
1033 argp->end = p + (PAGE_SIZE>>2);
1034 argp->pagelen -= PAGE_SIZE;
1035 }
1036 }
1037 op->opnum = ntohl(*argp->p++);
1038
1039 switch (op->opnum) {
1040 case 2: /* Reserved operation */
1041 op->opnum = OP_ILLEGAL;
1042 if (argp->minorversion == 0)
1043 op->status = nfserr_op_illegal;
1044 else
1045 op->status = nfserr_minor_vers_mismatch;
1046 break;
1047 case OP_ACCESS:
1048 op->status = nfsd4_decode_access(argp, &op->u.access);
1049 break;
1050 case OP_CLOSE:
1051 op->status = nfsd4_decode_close(argp, &op->u.close);
1052 break;
1053 case OP_COMMIT:
1054 op->status = nfsd4_decode_commit(argp, &op->u.commit);
1055 break;
1056 case OP_CREATE:
1057 op->status = nfsd4_decode_create(argp, &op->u.create);
1058 break;
1059 case OP_DELEGRETURN:
1060 op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
1061 break;
1062 case OP_GETATTR:
1063 op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
1064 break;
1065 case OP_GETFH:
1066 op->status = nfs_ok;
1067 break;
1068 case OP_LINK:
1069 op->status = nfsd4_decode_link(argp, &op->u.link);
1070 break;
1071 case OP_LOCK:
1072 op->status = nfsd4_decode_lock(argp, &op->u.lock);
1073 break;
1074 case OP_LOCKT:
1075 op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
1076 break;
1077 case OP_LOCKU:
1078 op->status = nfsd4_decode_locku(argp, &op->u.locku);
1079 break;
1080 case OP_LOOKUP:
1081 op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
1082 break;
1083 case OP_LOOKUPP:
1084 op->status = nfs_ok;
1085 break;
1086 case OP_NVERIFY:
1087 op->status = nfsd4_decode_verify(argp, &op->u.nverify);
1088 break;
1089 case OP_OPEN:
1090 op->status = nfsd4_decode_open(argp, &op->u.open);
1091 break;
1092 case OP_OPEN_CONFIRM:
1093 op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
1094 break;
1095 case OP_OPEN_DOWNGRADE:
1096 op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
1097 break;
1098 case OP_PUTFH:
1099 op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
1100 break;
1101 case OP_PUTROOTFH:
1102 op->status = nfs_ok;
1103 break;
1104 case OP_READ:
1105 op->status = nfsd4_decode_read(argp, &op->u.read);
1106 break;
1107 case OP_READDIR:
1108 op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
1109 break;
1110 case OP_READLINK:
1111 op->status = nfs_ok;
1112 break;
1113 case OP_REMOVE:
1114 op->status = nfsd4_decode_remove(argp, &op->u.remove);
1115 break;
1116 case OP_RENAME:
1117 op->status = nfsd4_decode_rename(argp, &op->u.rename);
1118 break;
1119 case OP_RESTOREFH:
1120 op->status = nfs_ok;
1121 break;
1122 case OP_RENEW:
1123 op->status = nfsd4_decode_renew(argp, &op->u.renew);
1124 break;
1125 case OP_SAVEFH:
1126 op->status = nfs_ok;
1127 break;
1128 case OP_SETATTR:
1129 op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
1130 break;
1131 case OP_SETCLIENTID:
1132 op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
1133 break;
1134 case OP_SETCLIENTID_CONFIRM:
1135 op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
1136 break;
1137 case OP_VERIFY:
1138 op->status = nfsd4_decode_verify(argp, &op->u.verify);
1139 break;
1140 case OP_WRITE:
1141 op->status = nfsd4_decode_write(argp, &op->u.write);
1142 break;
1143 case OP_RELEASE_LOCKOWNER:
1144 op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
1145 break;
1146 default:
1147 op->opnum = OP_ILLEGAL;
1148 op->status = nfserr_op_illegal;
1149 break;
1150 }
1151
1152 if (op->status) {
1153 argp->opcnt = i+1;
1154 break;
1155 }
1156 }
1157
1158 DECODE_TAIL;
1159 }
1160 /*
1161 * END OF "GENERIC" DECODE ROUTINES.
1162 */
1163
1164 /*
1165 * START OF "GENERIC" ENCODE ROUTINES.
1166 * These may look a little ugly since they are imported from a "generic"
1167 * set of XDR encode/decode routines which are intended to be shared by
1168 * all of our NFSv4 implementations (OpenBSD, MacOS X...).
1169 *
1170 * If the pain of reading these is too great, it should be a straightforward
1171 * task to translate them into Linux-specific versions which are more
1172 * consistent with the style used in NFSv2/v3...
1173 */
1174 #define ENCODE_HEAD u32 *p
1175
1176 #define WRITE32(n) *p++ = htonl(n)
1177 #define WRITE64(n) do { \
1178 *p++ = htonl((u32)((n) >> 32)); \
1179 *p++ = htonl((u32)(n)); \
1180 } while (0)
1181 #define WRITEMEM(ptr,nbytes) do { \
1182 *(p + XDR_QUADLEN(nbytes) -1) = 0; \
1183 memcpy(p, ptr, nbytes); \
1184 p += XDR_QUADLEN(nbytes); \
1185 } while (0)
1186 #define WRITECINFO(c) do { \
1187 *p++ = htonl(c.atomic); \
1188 *p++ = htonl(c.before_ctime_sec); \
1189 *p++ = htonl(c.before_ctime_nsec); \
1190 *p++ = htonl(c.after_ctime_sec); \
1191 *p++ = htonl(c.after_ctime_nsec); \
1192 } while (0)
1193
1194 #define RESERVE_SPACE(nbytes) do { \
1195 p = resp->p; \
1196 BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end); \
1197 } while (0)
1198 #define ADJUST_ARGS() resp->p = p
1199
1200 /*
1201 * Header routine to setup seqid operation replay cache
1202 */
1203 #define ENCODE_SEQID_OP_HEAD \
1204 u32 *p; \
1205 u32 *save; \
1206 \
1207 save = resp->p;
1208
1209 /*
1210 * Routine for encoding the result of a "seqid-mutating" NFSv4 operation. This
1211 * is where sequence id's are incremented, and the replay cache is filled.
1212 * Note that we increment sequence id's here, at the last moment, so we're sure
1213 * we know whether the error to be returned is a sequence id mutating error.
1214 */
1215
1216 #define ENCODE_SEQID_OP_TAIL(stateowner) do { \
1217 if (seqid_mutating_err(nfserr) && stateowner) { \
1218 stateowner->so_seqid++; \
1219 stateowner->so_replay.rp_status = nfserr; \
1220 stateowner->so_replay.rp_buflen = \
1221 (((char *)(resp)->p - (char *)save)); \
1222 memcpy(stateowner->so_replay.rp_buf, save, \
1223 stateowner->so_replay.rp_buflen); \
1224 } } while (0);
1225
1226
1227 static u32 nfs4_ftypes[16] = {
1228 NF4BAD, NF4FIFO, NF4CHR, NF4BAD,
1229 NF4DIR, NF4BAD, NF4BLK, NF4BAD,
1230 NF4REG, NF4BAD, NF4LNK, NF4BAD,
1231 NF4SOCK, NF4BAD, NF4LNK, NF4BAD,
1232 };
1233
1234 static int
1235 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1236 u32 **p, int *buflen)
1237 {
1238 int status;
1239
1240 if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1241 return nfserr_resource;
1242 if (whotype != NFS4_ACL_WHO_NAMED)
1243 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1244 else if (group)
1245 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1246 else
1247 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1248 if (status < 0)
1249 return nfserrno(status);
1250 *p = xdr_encode_opaque(*p, NULL, status);
1251 *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1252 BUG_ON(*buflen < 0);
1253 return 0;
1254 }
1255
1256 static inline int
1257 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, u32 **p, int *buflen)
1258 {
1259 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1260 }
1261
1262 static inline int
1263 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, u32 **p, int *buflen)
1264 {
1265 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1266 }
1267
1268 static inline int
1269 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1270 u32 **p, int *buflen)
1271 {
1272 return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1273 }
1274
1275
1276 /*
1277 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1278 * ourselves.
1279 *
1280 * @countp is the buffer size in _words_; upon successful return this becomes
1281 * replaced with the number of words written.
1282 */
1283 int
1284 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1285 struct dentry *dentry, u32 *buffer, int *countp, u32 *bmval,
1286 struct svc_rqst *rqstp)
1287 {
1288 u32 bmval0 = bmval[0];
1289 u32 bmval1 = bmval[1];
1290 struct kstat stat;
1291 struct svc_fh tempfh;
1292 struct kstatfs statfs;
1293 int buflen = *countp << 2;
1294 u32 *attrlenp;
1295 u32 dummy;
1296 u64 dummy64;
1297 u32 *p = buffer;
1298 int status;
1299 int aclsupport = 0;
1300 struct nfs4_acl *acl = NULL;
1301
1302 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1303 BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
1304 BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);
1305
1306 status = vfs_getattr(exp->ex_mnt, dentry, &stat);
1307 if (status)
1308 goto out_nfserr;
1309 if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
1310 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1311 FATTR4_WORD1_SPACE_TOTAL))) {
1312 status = vfs_statfs(dentry, &statfs);
1313 if (status)
1314 goto out_nfserr;
1315 }
1316 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1317 fh_init(&tempfh, NFS4_FHSIZE);
1318 status = fh_compose(&tempfh, exp, dentry, NULL);
1319 if (status)
1320 goto out;
1321 fhp = &tempfh;
1322 }
1323 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1324 | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1325 status = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1326 aclsupport = (status == 0);
1327 if (bmval0 & FATTR4_WORD0_ACL) {
1328 if (status == -EOPNOTSUPP)
1329 bmval0 &= ~FATTR4_WORD0_ACL;
1330 else if (status == -EINVAL) {
1331 status = nfserr_attrnotsupp;
1332 goto out;
1333 } else if (status != 0)
1334 goto out_nfserr;
1335 }
1336 }
1337 if ((buflen -= 16) < 0)
1338 goto out_resource;
1339
1340 WRITE32(2);
1341 WRITE32(bmval0);
1342 WRITE32(bmval1);
1343 attrlenp = p++; /* to be backfilled later */
1344
1345 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1346 if ((buflen -= 12) < 0)
1347 goto out_resource;
1348 WRITE32(2);
1349 WRITE32(aclsupport ?
1350 NFSD_SUPPORTED_ATTRS_WORD0 :
1351 NFSD_SUPPORTED_ATTRS_WORD0 & ~FATTR4_WORD0_ACL);
1352 WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
1353 }
1354 if (bmval0 & FATTR4_WORD0_TYPE) {
1355 if ((buflen -= 4) < 0)
1356 goto out_resource;
1357 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1358 if (dummy == NF4BAD)
1359 goto out_serverfault;
1360 WRITE32(dummy);
1361 }
1362 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1363 if ((buflen -= 4) < 0)
1364 goto out_resource;
1365 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1366 WRITE32(NFS4_FH_PERSISTENT);
1367 else
1368 WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1369 }
1370 if (bmval0 & FATTR4_WORD0_CHANGE) {
1371 /*
1372 * Note: This _must_ be consistent with the scheme for writing
1373 * change_info, so any changes made here must be reflected there
1374 * as well. (See xdr4.h:set_change_info() and the WRITECINFO()
1375 * macro above.)
1376 */
1377 if ((buflen -= 8) < 0)
1378 goto out_resource;
1379 WRITE32(stat.ctime.tv_sec);
1380 WRITE32(stat.ctime.tv_nsec);
1381 }
1382 if (bmval0 & FATTR4_WORD0_SIZE) {
1383 if ((buflen -= 8) < 0)
1384 goto out_resource;
1385 WRITE64(stat.size);
1386 }
1387 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1388 if ((buflen -= 4) < 0)
1389 goto out_resource;
1390 WRITE32(1);
1391 }
1392 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1393 if ((buflen -= 4) < 0)
1394 goto out_resource;
1395 WRITE32(1);
1396 }
1397 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1398 if ((buflen -= 4) < 0)
1399 goto out_resource;
1400 WRITE32(0);
1401 }
1402 if (bmval0 & FATTR4_WORD0_FSID) {
1403 if ((buflen -= 16) < 0)
1404 goto out_resource;
1405 if (is_fsid(fhp, rqstp->rq_reffh)) {
1406 WRITE64((u64)exp->ex_fsid);
1407 WRITE64((u64)0);
1408 } else {
1409 WRITE32(0);
1410 WRITE32(MAJOR(stat.dev));
1411 WRITE32(0);
1412 WRITE32(MINOR(stat.dev));
1413 }
1414 }
1415 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1416 if ((buflen -= 4) < 0)
1417 goto out_resource;
1418 WRITE32(0);
1419 }
1420 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1421 if ((buflen -= 4) < 0)
1422 goto out_resource;
1423 WRITE32(NFSD_LEASE_TIME);
1424 }
1425 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1426 if ((buflen -= 4) < 0)
1427 goto out_resource;
1428 WRITE32(0);
1429 }
1430 if (bmval0 & FATTR4_WORD0_ACL) {
1431 struct nfs4_ace *ace;
1432 struct list_head *h;
1433
1434 if (acl == NULL) {
1435 if ((buflen -= 4) < 0)
1436 goto out_resource;
1437
1438 WRITE32(0);
1439 goto out_acl;
1440 }
1441 if ((buflen -= 4) < 0)
1442 goto out_resource;
1443 WRITE32(acl->naces);
1444
1445 list_for_each(h, &acl->ace_head) {
1446 ace = list_entry(h, struct nfs4_ace, l_ace);
1447
1448 if ((buflen -= 4*3) < 0)
1449 goto out_resource;
1450 WRITE32(ace->type);
1451 WRITE32(ace->flag);
1452 WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1453 status = nfsd4_encode_aclname(rqstp, ace->whotype,
1454 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1455 &p, &buflen);
1456 if (status == nfserr_resource)
1457 goto out_resource;
1458 if (status)
1459 goto out;
1460 }
1461 }
1462 out_acl:
1463 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1464 if ((buflen -= 4) < 0)
1465 goto out_resource;
1466 WRITE32(aclsupport ?
1467 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1468 }
1469 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1470 if ((buflen -= 4) < 0)
1471 goto out_resource;
1472 WRITE32(1);
1473 }
1474 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1475 if ((buflen -= 4) < 0)
1476 goto out_resource;
1477 WRITE32(1);
1478 }
1479 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1480 if ((buflen -= 4) < 0)
1481 goto out_resource;
1482 WRITE32(1);
1483 }
1484 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1485 if ((buflen -= 4) < 0)
1486 goto out_resource;
1487 WRITE32(1);
1488 }
1489 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1490 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1491 if (buflen < 0)
1492 goto out_resource;
1493 WRITE32(fhp->fh_handle.fh_size);
1494 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1495 }
1496 if (bmval0 & FATTR4_WORD0_FILEID) {
1497 if ((buflen -= 8) < 0)
1498 goto out_resource;
1499 WRITE64((u64) stat.ino);
1500 }
1501 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1502 if ((buflen -= 8) < 0)
1503 goto out_resource;
1504 WRITE64((u64) statfs.f_ffree);
1505 }
1506 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1507 if ((buflen -= 8) < 0)
1508 goto out_resource;
1509 WRITE64((u64) statfs.f_ffree);
1510 }
1511 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1512 if ((buflen -= 8) < 0)
1513 goto out_resource;
1514 WRITE64((u64) statfs.f_files);
1515 }
1516 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
1517 if ((buflen -= 4) < 0)
1518 goto out_resource;
1519 WRITE32(1);
1520 }
1521 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
1522 if ((buflen -= 8) < 0)
1523 goto out_resource;
1524 WRITE64(~(u64)0);
1525 }
1526 if (bmval0 & FATTR4_WORD0_MAXLINK) {
1527 if ((buflen -= 4) < 0)
1528 goto out_resource;
1529 WRITE32(255);
1530 }
1531 if (bmval0 & FATTR4_WORD0_MAXNAME) {
1532 if ((buflen -= 4) < 0)
1533 goto out_resource;
1534 WRITE32(~(u32) 0);
1535 }
1536 if (bmval0 & FATTR4_WORD0_MAXREAD) {
1537 if ((buflen -= 8) < 0)
1538 goto out_resource;
1539 WRITE64((u64) NFSSVC_MAXBLKSIZE);
1540 }
1541 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
1542 if ((buflen -= 8) < 0)
1543 goto out_resource;
1544 WRITE64((u64) NFSSVC_MAXBLKSIZE);
1545 }
1546 if (bmval1 & FATTR4_WORD1_MODE) {
1547 if ((buflen -= 4) < 0)
1548 goto out_resource;
1549 WRITE32(stat.mode & S_IALLUGO);
1550 }
1551 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
1552 if ((buflen -= 4) < 0)
1553 goto out_resource;
1554 WRITE32(1);
1555 }
1556 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
1557 if ((buflen -= 4) < 0)
1558 goto out_resource;
1559 WRITE32(stat.nlink);
1560 }
1561 if (bmval1 & FATTR4_WORD1_OWNER) {
1562 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
1563 if (status == nfserr_resource)
1564 goto out_resource;
1565 if (status)
1566 goto out;
1567 }
1568 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
1569 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
1570 if (status == nfserr_resource)
1571 goto out_resource;
1572 if (status)
1573 goto out;
1574 }
1575 if (bmval1 & FATTR4_WORD1_RAWDEV) {
1576 if ((buflen -= 8) < 0)
1577 goto out_resource;
1578 WRITE32((u32) MAJOR(stat.rdev));
1579 WRITE32((u32) MINOR(stat.rdev));
1580 }
1581 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
1582 if ((buflen -= 8) < 0)
1583 goto out_resource;
1584 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
1585 WRITE64(dummy64);
1586 }
1587 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
1588 if ((buflen -= 8) < 0)
1589 goto out_resource;
1590 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
1591 WRITE64(dummy64);
1592 }
1593 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
1594 if ((buflen -= 8) < 0)
1595 goto out_resource;
1596 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
1597 WRITE64(dummy64);
1598 }
1599 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
1600 if ((buflen -= 8) < 0)
1601 goto out_resource;
1602 dummy64 = (u64)stat.blocks << 9;
1603 WRITE64(dummy64);
1604 }
1605 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
1606 if ((buflen -= 12) < 0)
1607 goto out_resource;
1608 WRITE32(0);
1609 WRITE32(stat.atime.tv_sec);
1610 WRITE32(stat.atime.tv_nsec);
1611 }
1612 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
1613 if ((buflen -= 12) < 0)
1614 goto out_resource;
1615 WRITE32(0);
1616 WRITE32(1);
1617 WRITE32(0);
1618 }
1619 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
1620 if ((buflen -= 12) < 0)
1621 goto out_resource;
1622 WRITE32(0);
1623 WRITE32(stat.ctime.tv_sec);
1624 WRITE32(stat.ctime.tv_nsec);
1625 }
1626 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
1627 if ((buflen -= 12) < 0)
1628 goto out_resource;
1629 WRITE32(0);
1630 WRITE32(stat.mtime.tv_sec);
1631 WRITE32(stat.mtime.tv_nsec);
1632 }
1633 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
1634 struct dentry *mnt_pnt, *mnt_root;
1635
1636 if ((buflen -= 8) < 0)
1637 goto out_resource;
1638 mnt_root = exp->ex_mnt->mnt_root;
1639 if (mnt_root->d_inode == dentry->d_inode) {
1640 mnt_pnt = exp->ex_mnt->mnt_mountpoint;
1641 WRITE64((u64) mnt_pnt->d_inode->i_ino);
1642 } else
1643 WRITE64((u64) stat.ino);
1644 }
1645 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1646 *countp = p - buffer;
1647 status = nfs_ok;
1648
1649 out:
1650 nfs4_acl_free(acl);
1651 if (fhp == &tempfh)
1652 fh_put(&tempfh);
1653 return status;
1654 out_nfserr:
1655 status = nfserrno(status);
1656 goto out;
1657 out_resource:
1658 *countp = 0;
1659 status = nfserr_resource;
1660 goto out;
1661 out_serverfault:
1662 status = nfserr_serverfault;
1663 goto out;
1664 }
1665
1666 static int
1667 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
1668 const char *name, int namlen, u32 *p, int *buflen)
1669 {
1670 struct svc_export *exp = cd->rd_fhp->fh_export;
1671 struct dentry *dentry;
1672 int nfserr;
1673
1674 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
1675 if (IS_ERR(dentry))
1676 return nfserrno(PTR_ERR(dentry));
1677
1678 exp_get(exp);
1679 if (d_mountpoint(dentry)) {
1680 if (nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp)) {
1681 /*
1682 * -EAGAIN is the only error returned from
1683 * nfsd_cross_mnt() and it indicates that an
1684 * up-call has been initiated to fill in the export
1685 * options on exp. When the answer comes back,
1686 * this call will be retried.
1687 */
1688 nfserr = nfserr_dropit;
1689 goto out_put;
1690 }
1691
1692 }
1693 nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1694 cd->rd_rqstp);
1695 out_put:
1696 dput(dentry);
1697 exp_put(exp);
1698 return nfserr;
1699 }
1700
1701 static u32 *
1702 nfsd4_encode_rdattr_error(u32 *p, int buflen, int nfserr)
1703 {
1704 u32 *attrlenp;
1705
1706 if (buflen < 6)
1707 return NULL;
1708 *p++ = htonl(2);
1709 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
1710 *p++ = htonl(0); /* bmval1 */
1711
1712 attrlenp = p++;
1713 *p++ = nfserr; /* no htonl */
1714 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
1715 return p;
1716 }
1717
1718 static int
1719 nfsd4_encode_dirent(struct readdir_cd *ccd, const char *name, int namlen,
1720 loff_t offset, ino_t ino, unsigned int d_type)
1721 {
1722 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
1723 int buflen;
1724 u32 *p = cd->buffer;
1725 int nfserr = nfserr_toosmall;
1726
1727 /* In nfsv4, "." and ".." never make it onto the wire.. */
1728 if (name && isdotent(name, namlen)) {
1729 cd->common.err = nfs_ok;
1730 return 0;
1731 }
1732
1733 if (cd->offset)
1734 xdr_encode_hyper(cd->offset, (u64) offset);
1735
1736 buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
1737 if (buflen < 0)
1738 goto fail;
1739
1740 *p++ = xdr_one; /* mark entry present */
1741 cd->offset = p; /* remember pointer */
1742 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
1743 p = xdr_encode_array(p, name, namlen); /* name length & name */
1744
1745 nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
1746 switch (nfserr) {
1747 case nfs_ok:
1748 p += buflen;
1749 break;
1750 case nfserr_resource:
1751 nfserr = nfserr_toosmall;
1752 goto fail;
1753 case nfserr_dropit:
1754 goto fail;
1755 default:
1756 /*
1757 * If the client requested the RDATTR_ERROR attribute,
1758 * we stuff the error code into this attribute
1759 * and continue. If this attribute was not requested,
1760 * then in accordance with the spec, we fail the
1761 * entire READDIR operation(!)
1762 */
1763 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
1764 goto fail;
1765 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1766 if (p == NULL) {
1767 nfserr = nfserr_toosmall;
1768 goto fail;
1769 }
1770 }
1771 cd->buflen -= (p - cd->buffer);
1772 cd->buffer = p;
1773 cd->common.err = nfs_ok;
1774 return 0;
1775 fail:
1776 cd->common.err = nfserr;
1777 return -EINVAL;
1778 }
1779
1780 static void
1781 nfsd4_encode_access(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_access *access)
1782 {
1783 ENCODE_HEAD;
1784
1785 if (!nfserr) {
1786 RESERVE_SPACE(8);
1787 WRITE32(access->ac_supported);
1788 WRITE32(access->ac_resp_access);
1789 ADJUST_ARGS();
1790 }
1791 }
1792
1793 static void
1794 nfsd4_encode_close(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_close *close)
1795 {
1796 ENCODE_SEQID_OP_HEAD;
1797
1798 if (!nfserr) {
1799 RESERVE_SPACE(sizeof(stateid_t));
1800 WRITE32(close->cl_stateid.si_generation);
1801 WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
1802 ADJUST_ARGS();
1803 }
1804 ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
1805 }
1806
1807
1808 static void
1809 nfsd4_encode_commit(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_commit *commit)
1810 {
1811 ENCODE_HEAD;
1812
1813 if (!nfserr) {
1814 RESERVE_SPACE(8);
1815 WRITEMEM(commit->co_verf.data, 8);
1816 ADJUST_ARGS();
1817 }
1818 }
1819
1820 static void
1821 nfsd4_encode_create(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_create *create)
1822 {
1823 ENCODE_HEAD;
1824
1825 if (!nfserr) {
1826 RESERVE_SPACE(32);
1827 WRITECINFO(create->cr_cinfo);
1828 WRITE32(2);
1829 WRITE32(create->cr_bmval[0]);
1830 WRITE32(create->cr_bmval[1]);
1831 ADJUST_ARGS();
1832 }
1833 }
1834
1835 static int
1836 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_getattr *getattr)
1837 {
1838 struct svc_fh *fhp = getattr->ga_fhp;
1839 int buflen;
1840
1841 if (nfserr)
1842 return nfserr;
1843
1844 buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
1845 nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
1846 resp->p, &buflen, getattr->ga_bmval,
1847 resp->rqstp);
1848
1849 if (!nfserr)
1850 resp->p += buflen;
1851 return nfserr;
1852 }
1853
1854 static void
1855 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, int nfserr, struct svc_fh *fhp)
1856 {
1857 unsigned int len;
1858 ENCODE_HEAD;
1859
1860 if (!nfserr) {
1861 len = fhp->fh_handle.fh_size;
1862 RESERVE_SPACE(len + 4);
1863 WRITE32(len);
1864 WRITEMEM(&fhp->fh_handle.fh_base, len);
1865 ADJUST_ARGS();
1866 }
1867 }
1868
1869 /*
1870 * Including all fields other than the name, a LOCK4denied structure requires
1871 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
1872 */
1873 static void
1874 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
1875 {
1876 ENCODE_HEAD;
1877
1878 RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
1879 WRITE64(ld->ld_start);
1880 WRITE64(ld->ld_length);
1881 WRITE32(ld->ld_type);
1882 if (ld->ld_sop) {
1883 WRITEMEM(&ld->ld_clientid, 8);
1884 WRITE32(ld->ld_sop->so_owner.len);
1885 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
1886 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
1887 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
1888 WRITE64((u64)0); /* clientid */
1889 WRITE32(0); /* length of owner name */
1890 }
1891 ADJUST_ARGS();
1892 }
1893
1894 static void
1895 nfsd4_encode_lock(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lock *lock)
1896 {
1897 ENCODE_SEQID_OP_HEAD;
1898
1899 if (!nfserr) {
1900 RESERVE_SPACE(4 + sizeof(stateid_t));
1901 WRITE32(lock->lk_resp_stateid.si_generation);
1902 WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
1903 ADJUST_ARGS();
1904 } else if (nfserr == nfserr_denied)
1905 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
1906
1907 ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
1908 }
1909
1910 static void
1911 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lockt *lockt)
1912 {
1913 if (nfserr == nfserr_denied)
1914 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
1915 }
1916
1917 static void
1918 nfsd4_encode_locku(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_locku *locku)
1919 {
1920 ENCODE_SEQID_OP_HEAD;
1921
1922 if (!nfserr) {
1923 RESERVE_SPACE(sizeof(stateid_t));
1924 WRITE32(locku->lu_stateid.si_generation);
1925 WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
1926 ADJUST_ARGS();
1927 }
1928
1929 ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
1930 }
1931
1932
1933 static void
1934 nfsd4_encode_link(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_link *link)
1935 {
1936 ENCODE_HEAD;
1937
1938 if (!nfserr) {
1939 RESERVE_SPACE(20);
1940 WRITECINFO(link->li_cinfo);
1941 ADJUST_ARGS();
1942 }
1943 }
1944
1945
1946 static void
1947 nfsd4_encode_open(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open *open)
1948 {
1949 ENCODE_SEQID_OP_HEAD;
1950
1951 if (nfserr)
1952 goto out;
1953
1954 RESERVE_SPACE(36 + sizeof(stateid_t));
1955 WRITE32(open->op_stateid.si_generation);
1956 WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
1957 WRITECINFO(open->op_cinfo);
1958 WRITE32(open->op_rflags);
1959 WRITE32(2);
1960 WRITE32(open->op_bmval[0]);
1961 WRITE32(open->op_bmval[1]);
1962 WRITE32(open->op_delegate_type);
1963 ADJUST_ARGS();
1964
1965 switch (open->op_delegate_type) {
1966 case NFS4_OPEN_DELEGATE_NONE:
1967 break;
1968 case NFS4_OPEN_DELEGATE_READ:
1969 RESERVE_SPACE(20 + sizeof(stateid_t));
1970 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
1971 WRITE32(open->op_recall);
1972
1973 /*
1974 * TODO: ACE's in delegations
1975 */
1976 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
1977 WRITE32(0);
1978 WRITE32(0);
1979 WRITE32(0); /* XXX: is NULL principal ok? */
1980 ADJUST_ARGS();
1981 break;
1982 case NFS4_OPEN_DELEGATE_WRITE:
1983 RESERVE_SPACE(32 + sizeof(stateid_t));
1984 WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
1985 WRITE32(0);
1986
1987 /*
1988 * TODO: space_limit's in delegations
1989 */
1990 WRITE32(NFS4_LIMIT_SIZE);
1991 WRITE32(~(u32)0);
1992 WRITE32(~(u32)0);
1993
1994 /*
1995 * TODO: ACE's in delegations
1996 */
1997 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
1998 WRITE32(0);
1999 WRITE32(0);
2000 WRITE32(0); /* XXX: is NULL principal ok? */
2001 ADJUST_ARGS();
2002 break;
2003 default:
2004 BUG();
2005 }
2006 /* XXX save filehandle here */
2007 out:
2008 ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2009 }
2010
2011 static void
2012 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_confirm *oc)
2013 {
2014 ENCODE_SEQID_OP_HEAD;
2015
2016 if (!nfserr) {
2017 RESERVE_SPACE(sizeof(stateid_t));
2018 WRITE32(oc->oc_resp_stateid.si_generation);
2019 WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
2020 ADJUST_ARGS();
2021 }
2022
2023 ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2024 }
2025
2026 static void
2027 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_downgrade *od)
2028 {
2029 ENCODE_SEQID_OP_HEAD;
2030
2031 if (!nfserr) {
2032 RESERVE_SPACE(sizeof(stateid_t));
2033 WRITE32(od->od_stateid.si_generation);
2034 WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
2035 ADJUST_ARGS();
2036 }
2037
2038 ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2039 }
2040
2041 static int
2042 nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr,
2043 struct nfsd4_read *read)
2044 {
2045 u32 eof;
2046 int v, pn;
2047 unsigned long maxcount;
2048 long len;
2049 ENCODE_HEAD;
2050
2051 if (nfserr)
2052 return nfserr;
2053 if (resp->xbuf->page_len)
2054 return nfserr_resource;
2055
2056 RESERVE_SPACE(8); /* eof flag and byte count */
2057
2058 maxcount = NFSSVC_MAXBLKSIZE;
2059 if (maxcount > read->rd_length)
2060 maxcount = read->rd_length;
2061
2062 len = maxcount;
2063 v = 0;
2064 while (len > 0) {
2065 pn = resp->rqstp->rq_resused++;
2066 resp->rqstp->rq_vec[v].iov_base =
2067 page_address(resp->rqstp->rq_respages[pn]);
2068 resp->rqstp->rq_vec[v].iov_len =
2069 len < PAGE_SIZE ? len : PAGE_SIZE;
2070 v++;
2071 len -= PAGE_SIZE;
2072 }
2073 read->rd_vlen = v;
2074
2075 nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2076 read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2077 &maxcount);
2078
2079 if (nfserr == nfserr_symlink)
2080 nfserr = nfserr_inval;
2081 if (nfserr)
2082 return nfserr;
2083 eof = (read->rd_offset + maxcount >=
2084 read->rd_fhp->fh_dentry->d_inode->i_size);
2085
2086 WRITE32(eof);
2087 WRITE32(maxcount);
2088 ADJUST_ARGS();
2089 resp->xbuf->head[0].iov_len = (char*)p
2090 - (char*)resp->xbuf->head[0].iov_base;
2091 resp->xbuf->page_len = maxcount;
2092
2093 /* Use rest of head for padding and remaining ops: */
2094 resp->xbuf->tail[0].iov_base = p;
2095 resp->xbuf->tail[0].iov_len = 0;
2096 if (maxcount&3) {
2097 RESERVE_SPACE(4);
2098 WRITE32(0);
2099 resp->xbuf->tail[0].iov_base += maxcount&3;
2100 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2101 ADJUST_ARGS();
2102 }
2103 return 0;
2104 }
2105
2106 static int
2107 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readlink *readlink)
2108 {
2109 int maxcount;
2110 char *page;
2111 ENCODE_HEAD;
2112
2113 if (nfserr)
2114 return nfserr;
2115 if (resp->xbuf->page_len)
2116 return nfserr_resource;
2117
2118 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2119
2120 maxcount = PAGE_SIZE;
2121 RESERVE_SPACE(4);
2122
2123 /*
2124 * XXX: By default, the ->readlink() VFS op will truncate symlinks
2125 * if they would overflow the buffer. Is this kosher in NFSv4? If
2126 * not, one easy fix is: if ->readlink() precisely fills the buffer,
2127 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2128 */
2129 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2130 if (nfserr == nfserr_isdir)
2131 return nfserr_inval;
2132 if (nfserr)
2133 return nfserr;
2134
2135 WRITE32(maxcount);
2136 ADJUST_ARGS();
2137 resp->xbuf->head[0].iov_len = (char*)p
2138 - (char*)resp->xbuf->head[0].iov_base;
2139 resp->xbuf->page_len = maxcount;
2140
2141 /* Use rest of head for padding and remaining ops: */
2142 resp->xbuf->tail[0].iov_base = p;
2143 resp->xbuf->tail[0].iov_len = 0;
2144 if (maxcount&3) {
2145 RESERVE_SPACE(4);
2146 WRITE32(0);
2147 resp->xbuf->tail[0].iov_base += maxcount&3;
2148 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2149 ADJUST_ARGS();
2150 }
2151 return 0;
2152 }
2153
2154 static int
2155 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readdir *readdir)
2156 {
2157 int maxcount;
2158 loff_t offset;
2159 u32 *page, *savep, *tailbase;
2160 ENCODE_HEAD;
2161
2162 if (nfserr)
2163 return nfserr;
2164 if (resp->xbuf->page_len)
2165 return nfserr_resource;
2166
2167 RESERVE_SPACE(8); /* verifier */
2168 savep = p;
2169
2170 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2171 WRITE32(0);
2172 WRITE32(0);
2173 ADJUST_ARGS();
2174 resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2175 tailbase = p;
2176
2177 maxcount = PAGE_SIZE;
2178 if (maxcount > readdir->rd_maxcount)
2179 maxcount = readdir->rd_maxcount;
2180
2181 /*
2182 * Convert from bytes to words, account for the two words already
2183 * written, make sure to leave two words at the end for the next
2184 * pointer and eof field.
2185 */
2186 maxcount = (maxcount >> 2) - 4;
2187 if (maxcount < 0) {
2188 nfserr = nfserr_toosmall;
2189 goto err_no_verf;
2190 }
2191
2192 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2193 readdir->common.err = 0;
2194 readdir->buflen = maxcount;
2195 readdir->buffer = page;
2196 readdir->offset = NULL;
2197
2198 offset = readdir->rd_cookie;
2199 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2200 &offset,
2201 &readdir->common, nfsd4_encode_dirent);
2202 if (nfserr == nfs_ok &&
2203 readdir->common.err == nfserr_toosmall &&
2204 readdir->buffer == page)
2205 nfserr = nfserr_toosmall;
2206 if (nfserr == nfserr_symlink)
2207 nfserr = nfserr_notdir;
2208 if (nfserr)
2209 goto err_no_verf;
2210
2211 if (readdir->offset)
2212 xdr_encode_hyper(readdir->offset, offset);
2213
2214 p = readdir->buffer;
2215 *p++ = 0; /* no more entries */
2216 *p++ = htonl(readdir->common.err == nfserr_eof);
2217 resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2218 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2219
2220 /* Use rest of head for padding and remaining ops: */
2221 resp->xbuf->tail[0].iov_base = tailbase;
2222 resp->xbuf->tail[0].iov_len = 0;
2223 resp->p = resp->xbuf->tail[0].iov_base;
2224 resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2225
2226 return 0;
2227 err_no_verf:
2228 p = savep;
2229 ADJUST_ARGS();
2230 return nfserr;
2231 }
2232
2233 static void
2234 nfsd4_encode_remove(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_remove *remove)
2235 {
2236 ENCODE_HEAD;
2237
2238 if (!nfserr) {
2239 RESERVE_SPACE(20);
2240 WRITECINFO(remove->rm_cinfo);
2241 ADJUST_ARGS();
2242 }
2243 }
2244
2245 static void
2246 nfsd4_encode_rename(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_rename *rename)
2247 {
2248 ENCODE_HEAD;
2249
2250 if (!nfserr) {
2251 RESERVE_SPACE(40);
2252 WRITECINFO(rename->rn_sinfo);
2253 WRITECINFO(rename->rn_tinfo);
2254 ADJUST_ARGS();
2255 }
2256 }
2257
2258 /*
2259 * The SETATTR encode routine is special -- it always encodes a bitmap,
2260 * regardless of the error status.
2261 */
2262 static void
2263 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setattr *setattr)
2264 {
2265 ENCODE_HEAD;
2266
2267 RESERVE_SPACE(12);
2268 if (nfserr) {
2269 WRITE32(2);
2270 WRITE32(0);
2271 WRITE32(0);
2272 }
2273 else {
2274 WRITE32(2);
2275 WRITE32(setattr->sa_bmval[0]);
2276 WRITE32(setattr->sa_bmval[1]);
2277 }
2278 ADJUST_ARGS();
2279 }
2280
2281 static void
2282 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setclientid *scd)
2283 {
2284 ENCODE_HEAD;
2285
2286 if (!nfserr) {
2287 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2288 WRITEMEM(&scd->se_clientid, 8);
2289 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2290 ADJUST_ARGS();
2291 }
2292 else if (nfserr == nfserr_clid_inuse) {
2293 RESERVE_SPACE(8);
2294 WRITE32(0);
2295 WRITE32(0);
2296 ADJUST_ARGS();
2297 }
2298 }
2299
2300 static void
2301 nfsd4_encode_write(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_write *write)
2302 {
2303 ENCODE_HEAD;
2304
2305 if (!nfserr) {
2306 RESERVE_SPACE(16);
2307 WRITE32(write->wr_bytes_written);
2308 WRITE32(write->wr_how_written);
2309 WRITEMEM(write->wr_verifier.data, 8);
2310 ADJUST_ARGS();
2311 }
2312 }
2313
2314 void
2315 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2316 {
2317 u32 *statp;
2318 ENCODE_HEAD;
2319
2320 RESERVE_SPACE(8);
2321 WRITE32(op->opnum);
2322 statp = p++; /* to be backfilled at the end */
2323 ADJUST_ARGS();
2324
2325 switch (op->opnum) {
2326 case OP_ACCESS:
2327 nfsd4_encode_access(resp, op->status, &op->u.access);
2328 break;
2329 case OP_CLOSE:
2330 nfsd4_encode_close(resp, op->status, &op->u.close);
2331 break;
2332 case OP_COMMIT:
2333 nfsd4_encode_commit(resp, op->status, &op->u.commit);
2334 break;
2335 case OP_CREATE:
2336 nfsd4_encode_create(resp, op->status, &op->u.create);
2337 break;
2338 case OP_DELEGRETURN:
2339 break;
2340 case OP_GETATTR:
2341 op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
2342 break;
2343 case OP_GETFH:
2344 nfsd4_encode_getfh(resp, op->status, op->u.getfh);
2345 break;
2346 case OP_LINK:
2347 nfsd4_encode_link(resp, op->status, &op->u.link);
2348 break;
2349 case OP_LOCK:
2350 nfsd4_encode_lock(resp, op->status, &op->u.lock);
2351 break;
2352 case OP_LOCKT:
2353 nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
2354 break;
2355 case OP_LOCKU:
2356 nfsd4_encode_locku(resp, op->status, &op->u.locku);
2357 break;
2358 case OP_LOOKUP:
2359 break;
2360 case OP_LOOKUPP:
2361 break;
2362 case OP_NVERIFY:
2363 break;
2364 case OP_OPEN:
2365 nfsd4_encode_open(resp, op->status, &op->u.open);
2366 break;
2367 case OP_OPEN_CONFIRM:
2368 nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
2369 break;
2370 case OP_OPEN_DOWNGRADE:
2371 nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
2372 break;
2373 case OP_PUTFH:
2374 break;
2375 case OP_PUTROOTFH:
2376 break;
2377 case OP_READ:
2378 op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
2379 break;
2380 case OP_READDIR:
2381 op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
2382 break;
2383 case OP_READLINK:
2384 op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
2385 break;
2386 case OP_REMOVE:
2387 nfsd4_encode_remove(resp, op->status, &op->u.remove);
2388 break;
2389 case OP_RENAME:
2390 nfsd4_encode_rename(resp, op->status, &op->u.rename);
2391 break;
2392 case OP_RENEW:
2393 break;
2394 case OP_RESTOREFH:
2395 break;
2396 case OP_SAVEFH:
2397 break;
2398 case OP_SETATTR:
2399 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
2400 break;
2401 case OP_SETCLIENTID:
2402 nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
2403 break;
2404 case OP_SETCLIENTID_CONFIRM:
2405 break;
2406 case OP_VERIFY:
2407 break;
2408 case OP_WRITE:
2409 nfsd4_encode_write(resp, op->status, &op->u.write);
2410 break;
2411 case OP_RELEASE_LOCKOWNER:
2412 break;
2413 default:
2414 break;
2415 }
2416
2417 /*
2418 * Note: We write the status directly, instead of using WRITE32(),
2419 * since it is already in network byte order.
2420 */
2421 *statp = op->status;
2422 }
2423
2424 /*
2425 * Encode the reply stored in the stateowner reply cache
2426 *
2427 * XDR note: do not encode rp->rp_buflen: the buffer contains the
2428 * previously sent already encoded operation.
2429 *
2430 * called with nfs4_lock_state() held
2431 */
2432 void
2433 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
2434 {
2435 ENCODE_HEAD;
2436 struct nfs4_replay *rp = op->replay;
2437
2438 BUG_ON(!rp);
2439
2440 RESERVE_SPACE(8);
2441 WRITE32(op->opnum);
2442 *p++ = rp->rp_status; /* already xdr'ed */
2443 ADJUST_ARGS();
2444
2445 RESERVE_SPACE(rp->rp_buflen);
2446 WRITEMEM(rp->rp_buf, rp->rp_buflen);
2447 ADJUST_ARGS();
2448 }
2449
2450 /*
2451 * END OF "GENERIC" ENCODE ROUTINES.
2452 */
2453
2454 int
2455 nfs4svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
2456 {
2457 return xdr_ressize_check(rqstp, p);
2458 }
2459
2460 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
2461 {
2462 if (args->ops != args->iops) {
2463 kfree(args->ops);
2464 args->ops = args->iops;
2465 }
2466 kfree(args->tmpp);
2467 args->tmpp = NULL;
2468 while (args->to_free) {
2469 struct tmpbuf *tb = args->to_free;
2470 args->to_free = tb->next;
2471 tb->release(tb->buf);
2472 kfree(tb);
2473 }
2474 }
2475
2476 int
2477 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundargs *args)
2478 {
2479 int status;
2480
2481 args->p = p;
2482 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
2483 args->pagelist = rqstp->rq_arg.pages;
2484 args->pagelen = rqstp->rq_arg.page_len;
2485 args->tmpp = NULL;
2486 args->to_free = NULL;
2487 args->ops = args->iops;
2488 args->rqstp = rqstp;
2489
2490 status = nfsd4_decode_compound(args);
2491 if (status) {
2492 nfsd4_release_compoundargs(args);
2493 }
2494 return !status;
2495 }
2496
2497 int
2498 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundres *resp)
2499 {
2500 /*
2501 * All that remains is to write the tag and operation count...
2502 */
2503 struct kvec *iov;
2504 p = resp->tagp;
2505 *p++ = htonl(resp->taglen);
2506 memcpy(p, resp->tag, resp->taglen);
2507 p += XDR_QUADLEN(resp->taglen);
2508 *p++ = htonl(resp->opcnt);
2509
2510 if (rqstp->rq_res.page_len)
2511 iov = &rqstp->rq_res.tail[0];
2512 else
2513 iov = &rqstp->rq_res.head[0];
2514 iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
2515 BUG_ON(iov->iov_len > PAGE_SIZE);
2516 return 1;
2517 }
2518
2519 /*
2520 * Local variables:
2521 * c-basic-offset: 8
2522 * End:
2523 */
USB Experimental Work