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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / fs / nfsd / nfs4xdr.c
blob9df898ba648f73a14b1e42be47dbfddf189ec0a6
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
36 #include <linux/file.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/statfs.h>
40 #include <linux/utsname.h>
41 #include <linux/pagemap.h>
42 #include <linux/sunrpc/svcauth_gss.h>
43
44 #include "idmap.h"
45 #include "acl.h"
46 #include "xdr4.h"
47 #include "vfs.h"
48 #include "state.h"
49 #include "cache.h"
50 #include "netns.h"
51 #include "pnfs.h"
52
53 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
54 #include <linux/security.h>
55 #endif
56
57
58 #define NFSDDBG_FACILITY NFSDDBG_XDR
59
60 /*
61 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
62 * directory in order to indicate to the client that a filesystem boundary is present
63 * We use a fixed fsid for a referral
64 */
65 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
66 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
67
68 static __be32
69 check_filename(char *str, int len)
70 {
71 int i;
72
73 if (len == 0)
74 return nfserr_inval;
75 if (isdotent(str, len))
76 return nfserr_badname;
77 for (i = 0; i < len; i++)
78 if (str[i] == '/')
79 return nfserr_badname;
80 return 0;
81 }
82
83 #define DECODE_HEAD \
84 __be32 *p; \
85 __be32 status
86 #define DECODE_TAIL \
87 status = 0; \
88 out: \
89 return status; \
90 xdr_error: \
91 dprintk("NFSD: xdr error (%s:%d)\n", \
92 __FILE__, __LINE__); \
93 status = nfserr_bad_xdr; \
94 goto out
95
96 #define READMEM(x,nbytes) do { \
97 x = (char *)p; \
98 p += XDR_QUADLEN(nbytes); \
99 } while (0)
100 #define SAVEMEM(x,nbytes) do { \
101 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
102 savemem(argp, p, nbytes) : \
103 (char *)p)) { \
104 dprintk("NFSD: xdr error (%s:%d)\n", \
105 __FILE__, __LINE__); \
106 goto xdr_error; \
107 } \
108 p += XDR_QUADLEN(nbytes); \
109 } while (0)
110 #define COPYMEM(x,nbytes) do { \
111 memcpy((x), p, nbytes); \
112 p += XDR_QUADLEN(nbytes); \
113 } while (0)
114
115 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
116 #define READ_BUF(nbytes) do { \
117 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
118 p = argp->p; \
119 argp->p += XDR_QUADLEN(nbytes); \
120 } else if (!(p = read_buf(argp, nbytes))) { \
121 dprintk("NFSD: xdr error (%s:%d)\n", \
122 __FILE__, __LINE__); \
123 goto xdr_error; \
124 } \
125 } while (0)
126
127 static void next_decode_page(struct nfsd4_compoundargs *argp)
128 {
129 argp->p = page_address(argp->pagelist[0]);
130 argp->pagelist++;
131 if (argp->pagelen < PAGE_SIZE) {
132 argp->end = argp->p + (argp->pagelen>>2);
133 argp->pagelen = 0;
134 } else {
135 argp->end = argp->p + (PAGE_SIZE>>2);
136 argp->pagelen -= PAGE_SIZE;
137 }
138 }
139
140 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
141 {
142 /* We want more bytes than seem to be available.
143 * Maybe we need a new page, maybe we have just run out
144 */
145 unsigned int avail = (char *)argp->end - (char *)argp->p;
146 __be32 *p;
147 if (avail + argp->pagelen < nbytes)
148 return NULL;
149 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
150 return NULL;
151 /* ok, we can do it with the current plus the next page */
152 if (nbytes <= sizeof(argp->tmp))
153 p = argp->tmp;
154 else {
155 kfree(argp->tmpp);
156 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
157 if (!p)
158 return NULL;
159
160 }
161 /*
162 * The following memcpy is safe because read_buf is always
163 * called with nbytes > avail, and the two cases above both
164 * guarantee p points to at least nbytes bytes.
165 */
166 memcpy(p, argp->p, avail);
167 next_decode_page(argp);
168 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
169 argp->p += XDR_QUADLEN(nbytes - avail);
170 return p;
171 }
172
173 static int zero_clientid(clientid_t *clid)
174 {
175 return (clid->cl_boot == 0) && (clid->cl_id == 0);
176 }
177
178 /**
179 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
180 * @argp: NFSv4 compound argument structure
181 * @p: pointer to be freed (with kfree())
182 *
183 * Marks @p to be freed when processing the compound operation
184 * described in @argp finishes.
185 */
186 static void *
187 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
188 {
189 struct svcxdr_tmpbuf *tb;
190
191 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
192 if (!tb)
193 return NULL;
194 tb->next = argp->to_free;
195 argp->to_free = tb;
196 return tb->buf;
197 }
198
199 /*
200 * For xdr strings that need to be passed to other kernel api's
201 * as null-terminated strings.
202 *
203 * Note null-terminating in place usually isn't safe since the
204 * buffer might end on a page boundary.
205 */
206 static char *
207 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
208 {
209 char *p = svcxdr_tmpalloc(argp, len + 1);
210
211 if (!p)
212 return NULL;
213 memcpy(p, buf, len);
214 p[len] = '\0';
215 return p;
216 }
217
218 /**
219 * savemem - duplicate a chunk of memory for later processing
220 * @argp: NFSv4 compound argument structure to be freed with
221 * @p: pointer to be duplicated
222 * @nbytes: length to be duplicated
223 *
224 * Returns a pointer to a copy of @nbytes bytes of memory at @p
225 * that are preserved until processing of the NFSv4 compound
226 * operation described by @argp finishes.
227 */
228 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
229 {
230 void *ret;
231
232 ret = svcxdr_tmpalloc(argp, nbytes);
233 if (!ret)
234 return NULL;
235 memcpy(ret, p, nbytes);
236 return ret;
237 }
238
239 /*
240 * We require the high 32 bits of 'seconds' to be 0, and
241 * we ignore all 32 bits of 'nseconds'.
242 */
243 static __be32
244 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
245 {
246 DECODE_HEAD;
247 u64 sec;
248
249 READ_BUF(12);
250 p = xdr_decode_hyper(p, &sec);
251 tv->tv_sec = sec;
252 tv->tv_nsec = be32_to_cpup(p++);
253 if (tv->tv_nsec >= (u32)1000000000)
254 return nfserr_inval;
255
256 DECODE_TAIL;
257 }
258
259 static __be32
260 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
261 {
262 u32 bmlen;
263 DECODE_HEAD;
264
265 bmval[0] = 0;
266 bmval[1] = 0;
267 bmval[2] = 0;
268
269 READ_BUF(4);
270 bmlen = be32_to_cpup(p++);
271 if (bmlen > 1000)
272 goto xdr_error;
273
274 READ_BUF(bmlen << 2);
275 if (bmlen > 0)
276 bmval[0] = be32_to_cpup(p++);
277 if (bmlen > 1)
278 bmval[1] = be32_to_cpup(p++);
279 if (bmlen > 2)
280 bmval[2] = be32_to_cpup(p++);
281
282 DECODE_TAIL;
283 }
284
285 static __be32
286 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
287 struct iattr *iattr, struct nfs4_acl **acl,
288 struct xdr_netobj *label)
289 {
290 int expected_len, len = 0;
291 u32 dummy32;
292 char *buf;
293
294 DECODE_HEAD;
295 iattr->ia_valid = 0;
296 if ((status = nfsd4_decode_bitmap(argp, bmval)))
297 return status;
298
299 READ_BUF(4);
300 expected_len = be32_to_cpup(p++);
301
302 if (bmval[0] & FATTR4_WORD0_SIZE) {
303 READ_BUF(8);
304 len += 8;
305 p = xdr_decode_hyper(p, &iattr->ia_size);
306 iattr->ia_valid |= ATTR_SIZE;
307 }
308 if (bmval[0] & FATTR4_WORD0_ACL) {
309 u32 nace;
310 struct nfs4_ace *ace;
311
312 READ_BUF(4); len += 4;
313 nace = be32_to_cpup(p++);
314
315 if (nace > NFS4_ACL_MAX)
316 return nfserr_fbig;
317
318 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
319 if (*acl == NULL)
320 return nfserr_jukebox;
321
322 (*acl)->naces = nace;
323 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
324 READ_BUF(16); len += 16;
325 ace->type = be32_to_cpup(p++);
326 ace->flag = be32_to_cpup(p++);
327 ace->access_mask = be32_to_cpup(p++);
328 dummy32 = be32_to_cpup(p++);
329 READ_BUF(dummy32);
330 len += XDR_QUADLEN(dummy32) << 2;
331 READMEM(buf, dummy32);
332 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
333 status = nfs_ok;
334 if (ace->whotype != NFS4_ACL_WHO_NAMED)
335 ;
336 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
337 status = nfsd_map_name_to_gid(argp->rqstp,
338 buf, dummy32, &ace->who_gid);
339 else
340 status = nfsd_map_name_to_uid(argp->rqstp,
341 buf, dummy32, &ace->who_uid);
342 if (status)
343 return status;
344 }
345 } else
346 *acl = NULL;
347 if (bmval[1] & FATTR4_WORD1_MODE) {
348 READ_BUF(4);
349 len += 4;
350 iattr->ia_mode = be32_to_cpup(p++);
351 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
352 iattr->ia_valid |= ATTR_MODE;
353 }
354 if (bmval[1] & FATTR4_WORD1_OWNER) {
355 READ_BUF(4);
356 len += 4;
357 dummy32 = be32_to_cpup(p++);
358 READ_BUF(dummy32);
359 len += (XDR_QUADLEN(dummy32) << 2);
360 READMEM(buf, dummy32);
361 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
362 return status;
363 iattr->ia_valid |= ATTR_UID;
364 }
365 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
366 READ_BUF(4);
367 len += 4;
368 dummy32 = be32_to_cpup(p++);
369 READ_BUF(dummy32);
370 len += (XDR_QUADLEN(dummy32) << 2);
371 READMEM(buf, dummy32);
372 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
373 return status;
374 iattr->ia_valid |= ATTR_GID;
375 }
376 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
377 READ_BUF(4);
378 len += 4;
379 dummy32 = be32_to_cpup(p++);
380 switch (dummy32) {
381 case NFS4_SET_TO_CLIENT_TIME:
382 len += 12;
383 status = nfsd4_decode_time(argp, &iattr->ia_atime);
384 if (status)
385 return status;
386 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
387 break;
388 case NFS4_SET_TO_SERVER_TIME:
389 iattr->ia_valid |= ATTR_ATIME;
390 break;
391 default:
392 goto xdr_error;
393 }
394 }
395 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
396 READ_BUF(4);
397 len += 4;
398 dummy32 = be32_to_cpup(p++);
399 switch (dummy32) {
400 case NFS4_SET_TO_CLIENT_TIME:
401 len += 12;
402 status = nfsd4_decode_time(argp, &iattr->ia_mtime);
403 if (status)
404 return status;
405 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
406 break;
407 case NFS4_SET_TO_SERVER_TIME:
408 iattr->ia_valid |= ATTR_MTIME;
409 break;
410 default:
411 goto xdr_error;
412 }
413 }
414
415 label->len = 0;
416 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
417 if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
418 READ_BUF(4);
419 len += 4;
420 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
421 READ_BUF(4);
422 len += 4;
423 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
424 READ_BUF(4);
425 len += 4;
426 dummy32 = be32_to_cpup(p++);
427 READ_BUF(dummy32);
428 if (dummy32 > NFS4_MAXLABELLEN)
429 return nfserr_badlabel;
430 len += (XDR_QUADLEN(dummy32) << 2);
431 READMEM(buf, dummy32);
432 label->len = dummy32;
433 label->data = svcxdr_dupstr(argp, buf, dummy32);
434 if (!label->data)
435 return nfserr_jukebox;
436 }
437 #endif
438
439 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
440 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
441 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
442 READ_BUF(expected_len - len);
443 else if (len != expected_len)
444 goto xdr_error;
445
446 DECODE_TAIL;
447 }
448
449 static __be32
450 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
451 {
452 DECODE_HEAD;
453
454 READ_BUF(sizeof(stateid_t));
455 sid->si_generation = be32_to_cpup(p++);
456 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
457
458 DECODE_TAIL;
459 }
460
461 static __be32
462 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
463 {
464 DECODE_HEAD;
465
466 READ_BUF(4);
467 access->ac_req_access = be32_to_cpup(p++);
468
469 DECODE_TAIL;
470 }
471
472 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
473 {
474 DECODE_HEAD;
475 u32 dummy, uid, gid;
476 char *machine_name;
477 int i;
478 int nr_secflavs;
479
480 /* callback_sec_params4 */
481 READ_BUF(4);
482 nr_secflavs = be32_to_cpup(p++);
483 if (nr_secflavs)
484 cbs->flavor = (u32)(-1);
485 else
486 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
487 cbs->flavor = 0;
488 for (i = 0; i < nr_secflavs; ++i) {
489 READ_BUF(4);
490 dummy = be32_to_cpup(p++);
491 switch (dummy) {
492 case RPC_AUTH_NULL:
493 /* Nothing to read */
494 if (cbs->flavor == (u32)(-1))
495 cbs->flavor = RPC_AUTH_NULL;
496 break;
497 case RPC_AUTH_UNIX:
498 READ_BUF(8);
499 /* stamp */
500 dummy = be32_to_cpup(p++);
501
502 /* machine name */
503 dummy = be32_to_cpup(p++);
504 READ_BUF(dummy);
505 SAVEMEM(machine_name, dummy);
506
507 /* uid, gid */
508 READ_BUF(8);
509 uid = be32_to_cpup(p++);
510 gid = be32_to_cpup(p++);
511
512 /* more gids */
513 READ_BUF(4);
514 dummy = be32_to_cpup(p++);
515 READ_BUF(dummy * 4);
516 if (cbs->flavor == (u32)(-1)) {
517 kuid_t kuid = make_kuid(&init_user_ns, uid);
518 kgid_t kgid = make_kgid(&init_user_ns, gid);
519 if (uid_valid(kuid) && gid_valid(kgid)) {
520 cbs->uid = kuid;
521 cbs->gid = kgid;
522 cbs->flavor = RPC_AUTH_UNIX;
523 } else {
524 dprintk("RPC_AUTH_UNIX with invalid"
525 "uid or gid ignoring!\n");
526 }
527 }
528 break;
529 case RPC_AUTH_GSS:
530 dprintk("RPC_AUTH_GSS callback secflavor "
531 "not supported!\n");
532 READ_BUF(8);
533 /* gcbp_service */
534 dummy = be32_to_cpup(p++);
535 /* gcbp_handle_from_server */
536 dummy = be32_to_cpup(p++);
537 READ_BUF(dummy);
538 p += XDR_QUADLEN(dummy);
539 /* gcbp_handle_from_client */
540 READ_BUF(4);
541 dummy = be32_to_cpup(p++);
542 READ_BUF(dummy);
543 break;
544 default:
545 dprintk("Illegal callback secflavor\n");
546 return nfserr_inval;
547 }
548 }
549 DECODE_TAIL;
550 }
551
552 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
553 {
554 DECODE_HEAD;
555
556 READ_BUF(4);
557 bc->bc_cb_program = be32_to_cpup(p++);
558 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
559
560 DECODE_TAIL;
561 }
562
563 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
564 {
565 DECODE_HEAD;
566
567 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
568 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
569 bcts->dir = be32_to_cpup(p++);
570 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
571 * could help us figure out we should be using it. */
572 DECODE_TAIL;
573 }
574
575 static __be32
576 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
577 {
578 DECODE_HEAD;
579
580 READ_BUF(4);
581 close->cl_seqid = be32_to_cpup(p++);
582 return nfsd4_decode_stateid(argp, &close->cl_stateid);
583
584 DECODE_TAIL;
585 }
586
587
588 static __be32
589 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
590 {
591 DECODE_HEAD;
592
593 READ_BUF(12);
594 p = xdr_decode_hyper(p, &commit->co_offset);
595 commit->co_count = be32_to_cpup(p++);
596
597 DECODE_TAIL;
598 }
599
600 static __be32
601 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
602 {
603 DECODE_HEAD;
604
605 READ_BUF(4);
606 create->cr_type = be32_to_cpup(p++);
607 switch (create->cr_type) {
608 case NF4LNK:
609 READ_BUF(4);
610 create->cr_datalen = be32_to_cpup(p++);
611 READ_BUF(create->cr_datalen);
612 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
613 if (!create->cr_data)
614 return nfserr_jukebox;
615 break;
616 case NF4BLK:
617 case NF4CHR:
618 READ_BUF(8);
619 create->cr_specdata1 = be32_to_cpup(p++);
620 create->cr_specdata2 = be32_to_cpup(p++);
621 break;
622 case NF4SOCK:
623 case NF4FIFO:
624 case NF4DIR:
625 default:
626 break;
627 }
628
629 READ_BUF(4);
630 create->cr_namelen = be32_to_cpup(p++);
631 READ_BUF(create->cr_namelen);
632 SAVEMEM(create->cr_name, create->cr_namelen);
633 if ((status = check_filename(create->cr_name, create->cr_namelen)))
634 return status;
635
636 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
637 &create->cr_acl, &create->cr_label);
638 if (status)
639 goto out;
640
641 DECODE_TAIL;
642 }
643
644 static inline __be32
645 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
646 {
647 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
648 }
649
650 static inline __be32
651 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
652 {
653 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
654 }
655
656 static __be32
657 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
658 {
659 DECODE_HEAD;
660
661 READ_BUF(4);
662 link->li_namelen = be32_to_cpup(p++);
663 READ_BUF(link->li_namelen);
664 SAVEMEM(link->li_name, link->li_namelen);
665 if ((status = check_filename(link->li_name, link->li_namelen)))
666 return status;
667
668 DECODE_TAIL;
669 }
670
671 static __be32
672 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
673 {
674 DECODE_HEAD;
675
676 /*
677 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
678 */
679 READ_BUF(28);
680 lock->lk_type = be32_to_cpup(p++);
681 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
682 goto xdr_error;
683 lock->lk_reclaim = be32_to_cpup(p++);
684 p = xdr_decode_hyper(p, &lock->lk_offset);
685 p = xdr_decode_hyper(p, &lock->lk_length);
686 lock->lk_is_new = be32_to_cpup(p++);
687
688 if (lock->lk_is_new) {
689 READ_BUF(4);
690 lock->lk_new_open_seqid = be32_to_cpup(p++);
691 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
692 if (status)
693 return status;
694 READ_BUF(8 + sizeof(clientid_t));
695 lock->lk_new_lock_seqid = be32_to_cpup(p++);
696 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
697 lock->lk_new_owner.len = be32_to_cpup(p++);
698 READ_BUF(lock->lk_new_owner.len);
699 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
700 } else {
701 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
702 if (status)
703 return status;
704 READ_BUF(4);
705 lock->lk_old_lock_seqid = be32_to_cpup(p++);
706 }
707
708 DECODE_TAIL;
709 }
710
711 static __be32
712 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
713 {
714 DECODE_HEAD;
715
716 READ_BUF(32);
717 lockt->lt_type = be32_to_cpup(p++);
718 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
719 goto xdr_error;
720 p = xdr_decode_hyper(p, &lockt->lt_offset);
721 p = xdr_decode_hyper(p, &lockt->lt_length);
722 COPYMEM(&lockt->lt_clientid, 8);
723 lockt->lt_owner.len = be32_to_cpup(p++);
724 READ_BUF(lockt->lt_owner.len);
725 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
726
727 DECODE_TAIL;
728 }
729
730 static __be32
731 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
732 {
733 DECODE_HEAD;
734
735 READ_BUF(8);
736 locku->lu_type = be32_to_cpup(p++);
737 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
738 goto xdr_error;
739 locku->lu_seqid = be32_to_cpup(p++);
740 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
741 if (status)
742 return status;
743 READ_BUF(16);
744 p = xdr_decode_hyper(p, &locku->lu_offset);
745 p = xdr_decode_hyper(p, &locku->lu_length);
746
747 DECODE_TAIL;
748 }
749
750 static __be32
751 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
752 {
753 DECODE_HEAD;
754
755 READ_BUF(4);
756 lookup->lo_len = be32_to_cpup(p++);
757 READ_BUF(lookup->lo_len);
758 SAVEMEM(lookup->lo_name, lookup->lo_len);
759 if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
760 return status;
761
762 DECODE_TAIL;
763 }
764
765 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
766 {
767 __be32 *p;
768 u32 w;
769
770 READ_BUF(4);
771 w = be32_to_cpup(p++);
772 *share_access = w & NFS4_SHARE_ACCESS_MASK;
773 *deleg_want = w & NFS4_SHARE_WANT_MASK;
774 if (deleg_when)
775 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
776
777 switch (w & NFS4_SHARE_ACCESS_MASK) {
778 case NFS4_SHARE_ACCESS_READ:
779 case NFS4_SHARE_ACCESS_WRITE:
780 case NFS4_SHARE_ACCESS_BOTH:
781 break;
782 default:
783 return nfserr_bad_xdr;
784 }
785 w &= ~NFS4_SHARE_ACCESS_MASK;
786 if (!w)
787 return nfs_ok;
788 if (!argp->minorversion)
789 return nfserr_bad_xdr;
790 switch (w & NFS4_SHARE_WANT_MASK) {
791 case NFS4_SHARE_WANT_NO_PREFERENCE:
792 case NFS4_SHARE_WANT_READ_DELEG:
793 case NFS4_SHARE_WANT_WRITE_DELEG:
794 case NFS4_SHARE_WANT_ANY_DELEG:
795 case NFS4_SHARE_WANT_NO_DELEG:
796 case NFS4_SHARE_WANT_CANCEL:
797 break;
798 default:
799 return nfserr_bad_xdr;
800 }
801 w &= ~NFS4_SHARE_WANT_MASK;
802 if (!w)
803 return nfs_ok;
804
805 if (!deleg_when) /* open_downgrade */
806 return nfserr_inval;
807 switch (w) {
808 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
809 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
810 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
811 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
812 return nfs_ok;
813 }
814 xdr_error:
815 return nfserr_bad_xdr;
816 }
817
818 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
819 {
820 __be32 *p;
821
822 READ_BUF(4);
823 *x = be32_to_cpup(p++);
824 /* Note: unlinke access bits, deny bits may be zero. */
825 if (*x & ~NFS4_SHARE_DENY_BOTH)
826 return nfserr_bad_xdr;
827 return nfs_ok;
828 xdr_error:
829 return nfserr_bad_xdr;
830 }
831
832 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
833 {
834 __be32 *p;
835
836 READ_BUF(4);
837 o->len = be32_to_cpup(p++);
838
839 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
840 return nfserr_bad_xdr;
841
842 READ_BUF(o->len);
843 SAVEMEM(o->data, o->len);
844 return nfs_ok;
845 xdr_error:
846 return nfserr_bad_xdr;
847 }
848
849 static __be32
850 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
851 {
852 DECODE_HEAD;
853 u32 dummy;
854
855 memset(open->op_bmval, 0, sizeof(open->op_bmval));
856 open->op_iattr.ia_valid = 0;
857 open->op_openowner = NULL;
858
859 open->op_xdr_error = 0;
860 /* seqid, share_access, share_deny, clientid, ownerlen */
861 READ_BUF(4);
862 open->op_seqid = be32_to_cpup(p++);
863 /* decode, yet ignore deleg_when until supported */
864 status = nfsd4_decode_share_access(argp, &open->op_share_access,
865 &open->op_deleg_want, &dummy);
866 if (status)
867 goto xdr_error;
868 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
869 if (status)
870 goto xdr_error;
871 READ_BUF(sizeof(clientid_t));
872 COPYMEM(&open->op_clientid, sizeof(clientid_t));
873 status = nfsd4_decode_opaque(argp, &open->op_owner);
874 if (status)
875 goto xdr_error;
876 READ_BUF(4);
877 open->op_create = be32_to_cpup(p++);
878 switch (open->op_create) {
879 case NFS4_OPEN_NOCREATE:
880 break;
881 case NFS4_OPEN_CREATE:
882 READ_BUF(4);
883 open->op_createmode = be32_to_cpup(p++);
884 switch (open->op_createmode) {
885 case NFS4_CREATE_UNCHECKED:
886 case NFS4_CREATE_GUARDED:
887 status = nfsd4_decode_fattr(argp, open->op_bmval,
888 &open->op_iattr, &open->op_acl, &open->op_label);
889 if (status)
890 goto out;
891 break;
892 case NFS4_CREATE_EXCLUSIVE:
893 READ_BUF(NFS4_VERIFIER_SIZE);
894 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
895 break;
896 case NFS4_CREATE_EXCLUSIVE4_1:
897 if (argp->minorversion < 1)
898 goto xdr_error;
899 READ_BUF(NFS4_VERIFIER_SIZE);
900 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
901 status = nfsd4_decode_fattr(argp, open->op_bmval,
902 &open->op_iattr, &open->op_acl, &open->op_label);
903 if (status)
904 goto out;
905 break;
906 default:
907 goto xdr_error;
908 }
909 break;
910 default:
911 goto xdr_error;
912 }
913
914 /* open_claim */
915 READ_BUF(4);
916 open->op_claim_type = be32_to_cpup(p++);
917 switch (open->op_claim_type) {
918 case NFS4_OPEN_CLAIM_NULL:
919 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
920 READ_BUF(4);
921 open->op_fname.len = be32_to_cpup(p++);
922 READ_BUF(open->op_fname.len);
923 SAVEMEM(open->op_fname.data, open->op_fname.len);
924 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
925 return status;
926 break;
927 case NFS4_OPEN_CLAIM_PREVIOUS:
928 READ_BUF(4);
929 open->op_delegate_type = be32_to_cpup(p++);
930 break;
931 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
932 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
933 if (status)
934 return status;
935 READ_BUF(4);
936 open->op_fname.len = be32_to_cpup(p++);
937 READ_BUF(open->op_fname.len);
938 SAVEMEM(open->op_fname.data, open->op_fname.len);
939 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
940 return status;
941 break;
942 case NFS4_OPEN_CLAIM_FH:
943 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
944 if (argp->minorversion < 1)
945 goto xdr_error;
946 /* void */
947 break;
948 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
949 if (argp->minorversion < 1)
950 goto xdr_error;
951 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
952 if (status)
953 return status;
954 break;
955 default:
956 goto xdr_error;
957 }
958
959 DECODE_TAIL;
960 }
961
962 static __be32
963 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
964 {
965 DECODE_HEAD;
966
967 if (argp->minorversion >= 1)
968 return nfserr_notsupp;
969
970 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
971 if (status)
972 return status;
973 READ_BUF(4);
974 open_conf->oc_seqid = be32_to_cpup(p++);
975
976 DECODE_TAIL;
977 }
978
979 static __be32
980 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
981 {
982 DECODE_HEAD;
983
984 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
985 if (status)
986 return status;
987 READ_BUF(4);
988 open_down->od_seqid = be32_to_cpup(p++);
989 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
990 &open_down->od_deleg_want, NULL);
991 if (status)
992 return status;
993 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
994 if (status)
995 return status;
996 DECODE_TAIL;
997 }
998
999 static __be32
1000 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1001 {
1002 DECODE_HEAD;
1003
1004 READ_BUF(4);
1005 putfh->pf_fhlen = be32_to_cpup(p++);
1006 if (putfh->pf_fhlen > NFS4_FHSIZE)
1007 goto xdr_error;
1008 READ_BUF(putfh->pf_fhlen);
1009 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1010
1011 DECODE_TAIL;
1012 }
1013
1014 static __be32
1015 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1016 {
1017 if (argp->minorversion == 0)
1018 return nfs_ok;
1019 return nfserr_notsupp;
1020 }
1021
1022 static __be32
1023 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1024 {
1025 DECODE_HEAD;
1026
1027 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1028 if (status)
1029 return status;
1030 READ_BUF(12);
1031 p = xdr_decode_hyper(p, &read->rd_offset);
1032 read->rd_length = be32_to_cpup(p++);
1033
1034 DECODE_TAIL;
1035 }
1036
1037 static __be32
1038 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1039 {
1040 DECODE_HEAD;
1041
1042 READ_BUF(24);
1043 p = xdr_decode_hyper(p, &readdir->rd_cookie);
1044 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1045 readdir->rd_dircount = be32_to_cpup(p++);
1046 readdir->rd_maxcount = be32_to_cpup(p++);
1047 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1048 goto out;
1049
1050 DECODE_TAIL;
1051 }
1052
1053 static __be32
1054 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1055 {
1056 DECODE_HEAD;
1057
1058 READ_BUF(4);
1059 remove->rm_namelen = be32_to_cpup(p++);
1060 READ_BUF(remove->rm_namelen);
1061 SAVEMEM(remove->rm_name, remove->rm_namelen);
1062 if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1063 return status;
1064
1065 DECODE_TAIL;
1066 }
1067
1068 static __be32
1069 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1070 {
1071 DECODE_HEAD;
1072
1073 READ_BUF(4);
1074 rename->rn_snamelen = be32_to_cpup(p++);
1075 READ_BUF(rename->rn_snamelen);
1076 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1077 READ_BUF(4);
1078 rename->rn_tnamelen = be32_to_cpup(p++);
1079 READ_BUF(rename->rn_tnamelen);
1080 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1081 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1082 return status;
1083 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1084 return status;
1085
1086 DECODE_TAIL;
1087 }
1088
1089 static __be32
1090 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1091 {
1092 DECODE_HEAD;
1093
1094 if (argp->minorversion >= 1)
1095 return nfserr_notsupp;
1096
1097 READ_BUF(sizeof(clientid_t));
1098 COPYMEM(clientid, sizeof(clientid_t));
1099
1100 DECODE_TAIL;
1101 }
1102
1103 static __be32
1104 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1105 struct nfsd4_secinfo *secinfo)
1106 {
1107 DECODE_HEAD;
1108
1109 READ_BUF(4);
1110 secinfo->si_namelen = be32_to_cpup(p++);
1111 READ_BUF(secinfo->si_namelen);
1112 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1113 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1114 if (status)
1115 return status;
1116 DECODE_TAIL;
1117 }
1118
1119 static __be32
1120 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1121 struct nfsd4_secinfo_no_name *sin)
1122 {
1123 DECODE_HEAD;
1124
1125 READ_BUF(4);
1126 sin->sin_style = be32_to_cpup(p++);
1127 DECODE_TAIL;
1128 }
1129
1130 static __be32
1131 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1132 {
1133 __be32 status;
1134
1135 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1136 if (status)
1137 return status;
1138 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1139 &setattr->sa_acl, &setattr->sa_label);
1140 }
1141
1142 static __be32
1143 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1144 {
1145 DECODE_HEAD;
1146
1147 if (argp->minorversion >= 1)
1148 return nfserr_notsupp;
1149
1150 READ_BUF(NFS4_VERIFIER_SIZE);
1151 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1152
1153 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1154 if (status)
1155 return nfserr_bad_xdr;
1156 READ_BUF(8);
1157 setclientid->se_callback_prog = be32_to_cpup(p++);
1158 setclientid->se_callback_netid_len = be32_to_cpup(p++);
1159 READ_BUF(setclientid->se_callback_netid_len);
1160 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1161 READ_BUF(4);
1162 setclientid->se_callback_addr_len = be32_to_cpup(p++);
1163
1164 READ_BUF(setclientid->se_callback_addr_len);
1165 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1166 READ_BUF(4);
1167 setclientid->se_callback_ident = be32_to_cpup(p++);
1168
1169 DECODE_TAIL;
1170 }
1171
1172 static __be32
1173 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1174 {
1175 DECODE_HEAD;
1176
1177 if (argp->minorversion >= 1)
1178 return nfserr_notsupp;
1179
1180 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1181 COPYMEM(&scd_c->sc_clientid, 8);
1182 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1183
1184 DECODE_TAIL;
1185 }
1186
1187 /* Also used for NVERIFY */
1188 static __be32
1189 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1190 {
1191 DECODE_HEAD;
1192
1193 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1194 goto out;
1195
1196 /* For convenience's sake, we compare raw xdr'd attributes in
1197 * nfsd4_proc_verify */
1198
1199 READ_BUF(4);
1200 verify->ve_attrlen = be32_to_cpup(p++);
1201 READ_BUF(verify->ve_attrlen);
1202 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1203
1204 DECODE_TAIL;
1205 }
1206
1207 static __be32
1208 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1209 {
1210 int avail;
1211 int len;
1212 DECODE_HEAD;
1213
1214 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1215 if (status)
1216 return status;
1217 READ_BUF(16);
1218 p = xdr_decode_hyper(p, &write->wr_offset);
1219 write->wr_stable_how = be32_to_cpup(p++);
1220 if (write->wr_stable_how > 2)
1221 goto xdr_error;
1222 write->wr_buflen = be32_to_cpup(p++);
1223
1224 /* Sorry .. no magic macros for this.. *
1225 * READ_BUF(write->wr_buflen);
1226 * SAVEMEM(write->wr_buf, write->wr_buflen);
1227 */
1228 avail = (char*)argp->end - (char*)argp->p;
1229 if (avail + argp->pagelen < write->wr_buflen) {
1230 dprintk("NFSD: xdr error (%s:%d)\n",
1231 __FILE__, __LINE__);
1232 goto xdr_error;
1233 }
1234 write->wr_head.iov_base = p;
1235 write->wr_head.iov_len = avail;
1236 write->wr_pagelist = argp->pagelist;
1237
1238 len = XDR_QUADLEN(write->wr_buflen) << 2;
1239 if (len >= avail) {
1240 int pages;
1241
1242 len -= avail;
1243
1244 pages = len >> PAGE_SHIFT;
1245 argp->pagelist += pages;
1246 argp->pagelen -= pages * PAGE_SIZE;
1247 len -= pages * PAGE_SIZE;
1248
1249 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1250 argp->pagelist++;
1251 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1252 }
1253 argp->p += XDR_QUADLEN(len);
1254
1255 DECODE_TAIL;
1256 }
1257
1258 static __be32
1259 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1260 {
1261 DECODE_HEAD;
1262
1263 if (argp->minorversion >= 1)
1264 return nfserr_notsupp;
1265
1266 READ_BUF(12);
1267 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1268 rlockowner->rl_owner.len = be32_to_cpup(p++);
1269 READ_BUF(rlockowner->rl_owner.len);
1270 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1271
1272 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1273 return nfserr_inval;
1274 DECODE_TAIL;
1275 }
1276
1277 static __be32
1278 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1279 struct nfsd4_exchange_id *exid)
1280 {
1281 int dummy, tmp;
1282 DECODE_HEAD;
1283
1284 READ_BUF(NFS4_VERIFIER_SIZE);
1285 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1286
1287 status = nfsd4_decode_opaque(argp, &exid->clname);
1288 if (status)
1289 return nfserr_bad_xdr;
1290
1291 READ_BUF(4);
1292 exid->flags = be32_to_cpup(p++);
1293
1294 /* Ignore state_protect4_a */
1295 READ_BUF(4);
1296 exid->spa_how = be32_to_cpup(p++);
1297 switch (exid->spa_how) {
1298 case SP4_NONE:
1299 break;
1300 case SP4_MACH_CRED:
1301 /* spo_must_enforce */
1302 READ_BUF(4);
1303 dummy = be32_to_cpup(p++);
1304 READ_BUF(dummy * 4);
1305 p += dummy;
1306
1307 /* spo_must_allow */
1308 READ_BUF(4);
1309 dummy = be32_to_cpup(p++);
1310 READ_BUF(dummy * 4);
1311 p += dummy;
1312 break;
1313 case SP4_SSV:
1314 /* ssp_ops */
1315 READ_BUF(4);
1316 dummy = be32_to_cpup(p++);
1317 READ_BUF(dummy * 4);
1318 p += dummy;
1319
1320 READ_BUF(4);
1321 dummy = be32_to_cpup(p++);
1322 READ_BUF(dummy * 4);
1323 p += dummy;
1324
1325 /* ssp_hash_algs<> */
1326 READ_BUF(4);
1327 tmp = be32_to_cpup(p++);
1328 while (tmp--) {
1329 READ_BUF(4);
1330 dummy = be32_to_cpup(p++);
1331 READ_BUF(dummy);
1332 p += XDR_QUADLEN(dummy);
1333 }
1334
1335 /* ssp_encr_algs<> */
1336 READ_BUF(4);
1337 tmp = be32_to_cpup(p++);
1338 while (tmp--) {
1339 READ_BUF(4);
1340 dummy = be32_to_cpup(p++);
1341 READ_BUF(dummy);
1342 p += XDR_QUADLEN(dummy);
1343 }
1344
1345 /* ssp_window and ssp_num_gss_handles */
1346 READ_BUF(8);
1347 dummy = be32_to_cpup(p++);
1348 dummy = be32_to_cpup(p++);
1349 break;
1350 default:
1351 goto xdr_error;
1352 }
1353
1354 /* Ignore Implementation ID */
1355 READ_BUF(4); /* nfs_impl_id4 array length */
1356 dummy = be32_to_cpup(p++);
1357
1358 if (dummy > 1)
1359 goto xdr_error;
1360
1361 if (dummy == 1) {
1362 /* nii_domain */
1363 READ_BUF(4);
1364 dummy = be32_to_cpup(p++);
1365 READ_BUF(dummy);
1366 p += XDR_QUADLEN(dummy);
1367
1368 /* nii_name */
1369 READ_BUF(4);
1370 dummy = be32_to_cpup(p++);
1371 READ_BUF(dummy);
1372 p += XDR_QUADLEN(dummy);
1373
1374 /* nii_date */
1375 READ_BUF(12);
1376 p += 3;
1377 }
1378 DECODE_TAIL;
1379 }
1380
1381 static __be32
1382 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1383 struct nfsd4_create_session *sess)
1384 {
1385 DECODE_HEAD;
1386 u32 dummy;
1387
1388 READ_BUF(16);
1389 COPYMEM(&sess->clientid, 8);
1390 sess->seqid = be32_to_cpup(p++);
1391 sess->flags = be32_to_cpup(p++);
1392
1393 /* Fore channel attrs */
1394 READ_BUF(28);
1395 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1396 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1397 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1398 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1399 sess->fore_channel.maxops = be32_to_cpup(p++);
1400 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1401 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1402 if (sess->fore_channel.nr_rdma_attrs == 1) {
1403 READ_BUF(4);
1404 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1405 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1406 dprintk("Too many fore channel attr bitmaps!\n");
1407 goto xdr_error;
1408 }
1409
1410 /* Back channel attrs */
1411 READ_BUF(28);
1412 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1413 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1414 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1415 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1416 sess->back_channel.maxops = be32_to_cpup(p++);
1417 sess->back_channel.maxreqs = be32_to_cpup(p++);
1418 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1419 if (sess->back_channel.nr_rdma_attrs == 1) {
1420 READ_BUF(4);
1421 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1422 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1423 dprintk("Too many back channel attr bitmaps!\n");
1424 goto xdr_error;
1425 }
1426
1427 READ_BUF(4);
1428 sess->callback_prog = be32_to_cpup(p++);
1429 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1430 DECODE_TAIL;
1431 }
1432
1433 static __be32
1434 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1435 struct nfsd4_destroy_session *destroy_session)
1436 {
1437 DECODE_HEAD;
1438 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1439 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1440
1441 DECODE_TAIL;
1442 }
1443
1444 static __be32
1445 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1446 struct nfsd4_free_stateid *free_stateid)
1447 {
1448 DECODE_HEAD;
1449
1450 READ_BUF(sizeof(stateid_t));
1451 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1452 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1453
1454 DECODE_TAIL;
1455 }
1456
1457 static __be32
1458 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1459 struct nfsd4_sequence *seq)
1460 {
1461 DECODE_HEAD;
1462
1463 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1464 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1465 seq->seqid = be32_to_cpup(p++);
1466 seq->slotid = be32_to_cpup(p++);
1467 seq->maxslots = be32_to_cpup(p++);
1468 seq->cachethis = be32_to_cpup(p++);
1469
1470 DECODE_TAIL;
1471 }
1472
1473 static __be32
1474 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1475 {
1476 int i;
1477 __be32 *p, status;
1478 struct nfsd4_test_stateid_id *stateid;
1479
1480 READ_BUF(4);
1481 test_stateid->ts_num_ids = ntohl(*p++);
1482
1483 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1484
1485 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1486 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1487 if (!stateid) {
1488 status = nfserrno(-ENOMEM);
1489 goto out;
1490 }
1491
1492 INIT_LIST_HEAD(&stateid->ts_id_list);
1493 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1494
1495 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1496 if (status)
1497 goto out;
1498 }
1499
1500 status = 0;
1501 out:
1502 return status;
1503 xdr_error:
1504 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1505 status = nfserr_bad_xdr;
1506 goto out;
1507 }
1508
1509 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1510 {
1511 DECODE_HEAD;
1512
1513 READ_BUF(8);
1514 COPYMEM(&dc->clientid, 8);
1515
1516 DECODE_TAIL;
1517 }
1518
1519 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1520 {
1521 DECODE_HEAD;
1522
1523 READ_BUF(4);
1524 rc->rca_one_fs = be32_to_cpup(p++);
1525
1526 DECODE_TAIL;
1527 }
1528
1529 #ifdef CONFIG_NFSD_PNFS
1530 static __be32
1531 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1532 struct nfsd4_getdeviceinfo *gdev)
1533 {
1534 DECODE_HEAD;
1535 u32 num, i;
1536
1537 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1538 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1539 gdev->gd_layout_type = be32_to_cpup(p++);
1540 gdev->gd_maxcount = be32_to_cpup(p++);
1541 num = be32_to_cpup(p++);
1542 if (num) {
1543 READ_BUF(4 * num);
1544 gdev->gd_notify_types = be32_to_cpup(p++);
1545 for (i = 1; i < num; i++) {
1546 if (be32_to_cpup(p++)) {
1547 status = nfserr_inval;
1548 goto out;
1549 }
1550 }
1551 }
1552 DECODE_TAIL;
1553 }
1554
1555 static __be32
1556 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1557 struct nfsd4_layoutget *lgp)
1558 {
1559 DECODE_HEAD;
1560
1561 READ_BUF(36);
1562 lgp->lg_signal = be32_to_cpup(p++);
1563 lgp->lg_layout_type = be32_to_cpup(p++);
1564 lgp->lg_seg.iomode = be32_to_cpup(p++);
1565 p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1566 p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1567 p = xdr_decode_hyper(p, &lgp->lg_minlength);
1568
1569 status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1570 if (status)
1571 return status;
1572
1573 READ_BUF(4);
1574 lgp->lg_maxcount = be32_to_cpup(p++);
1575
1576 DECODE_TAIL;
1577 }
1578
1579 static __be32
1580 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1581 struct nfsd4_layoutcommit *lcp)
1582 {
1583 DECODE_HEAD;
1584 u32 timechange;
1585
1586 READ_BUF(20);
1587 p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1588 p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1589 lcp->lc_reclaim = be32_to_cpup(p++);
1590
1591 status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1592 if (status)
1593 return status;
1594
1595 READ_BUF(4);
1596 lcp->lc_newoffset = be32_to_cpup(p++);
1597 if (lcp->lc_newoffset) {
1598 READ_BUF(8);
1599 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1600 } else
1601 lcp->lc_last_wr = 0;
1602 READ_BUF(4);
1603 timechange = be32_to_cpup(p++);
1604 if (timechange) {
1605 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1606 if (status)
1607 return status;
1608 } else {
1609 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1610 }
1611 READ_BUF(8);
1612 lcp->lc_layout_type = be32_to_cpup(p++);
1613
1614 /*
1615 * Save the layout update in XDR format and let the layout driver deal
1616 * with it later.
1617 */
1618 lcp->lc_up_len = be32_to_cpup(p++);
1619 if (lcp->lc_up_len > 0) {
1620 READ_BUF(lcp->lc_up_len);
1621 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1622 }
1623
1624 DECODE_TAIL;
1625 }
1626
1627 static __be32
1628 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1629 struct nfsd4_layoutreturn *lrp)
1630 {
1631 DECODE_HEAD;
1632
1633 READ_BUF(16);
1634 lrp->lr_reclaim = be32_to_cpup(p++);
1635 lrp->lr_layout_type = be32_to_cpup(p++);
1636 lrp->lr_seg.iomode = be32_to_cpup(p++);
1637 lrp->lr_return_type = be32_to_cpup(p++);
1638 if (lrp->lr_return_type == RETURN_FILE) {
1639 READ_BUF(16);
1640 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1641 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1642
1643 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1644 if (status)
1645 return status;
1646
1647 READ_BUF(4);
1648 lrp->lrf_body_len = be32_to_cpup(p++);
1649 if (lrp->lrf_body_len > 0) {
1650 READ_BUF(lrp->lrf_body_len);
1651 READMEM(lrp->lrf_body, lrp->lrf_body_len);
1652 }
1653 } else {
1654 lrp->lr_seg.offset = 0;
1655 lrp->lr_seg.length = NFS4_MAX_UINT64;
1656 }
1657
1658 DECODE_TAIL;
1659 }
1660 #endif /* CONFIG_NFSD_PNFS */
1661
1662 static __be32
1663 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1664 struct nfsd4_fallocate *fallocate)
1665 {
1666 DECODE_HEAD;
1667
1668 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1669 if (status)
1670 return status;
1671
1672 READ_BUF(16);
1673 p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1674 xdr_decode_hyper(p, &fallocate->falloc_length);
1675
1676 DECODE_TAIL;
1677 }
1678
1679 static __be32
1680 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1681 {
1682 DECODE_HEAD;
1683
1684 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1685 if (status)
1686 return status;
1687 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1688 if (status)
1689 return status;
1690
1691 READ_BUF(8 + 8 + 8);
1692 p = xdr_decode_hyper(p, &clone->cl_src_pos);
1693 p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1694 p = xdr_decode_hyper(p, &clone->cl_count);
1695 DECODE_TAIL;
1696 }
1697
1698 static __be32
1699 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1700 {
1701 DECODE_HEAD;
1702
1703 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1704 if (status)
1705 return status;
1706
1707 READ_BUF(8 + 4);
1708 p = xdr_decode_hyper(p, &seek->seek_offset);
1709 seek->seek_whence = be32_to_cpup(p);
1710
1711 DECODE_TAIL;
1712 }
1713
1714 static __be32
1715 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1716 {
1717 return nfs_ok;
1718 }
1719
1720 static __be32
1721 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1722 {
1723 return nfserr_notsupp;
1724 }
1725
1726 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1727
1728 static nfsd4_dec nfsd4_dec_ops[] = {
1729 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1730 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1731 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1732 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1733 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1734 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1735 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1736 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1737 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1738 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1739 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1740 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1741 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1742 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1743 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1744 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1745 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1746 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1747 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1748 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1749 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1750 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1751 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1752 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1753 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1754 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1755 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1756 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1757 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1758 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1759 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1760 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1761 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1762 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1763 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1764 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1765 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1766
1767 /* new operations for NFSv4.1 */
1768 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1769 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1770 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1771 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1772 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1773 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1774 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1775 #ifdef CONFIG_NFSD_PNFS
1776 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1777 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1778 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit,
1779 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget,
1780 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn,
1781 #else
1782 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1783 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1784 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1785 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1786 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1787 #endif
1788 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1789 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1790 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1791 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1792 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1793 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1794 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1795
1796 /* new operations for NFSv4.2 */
1797 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1798 [OP_COPY] = (nfsd4_dec)nfsd4_decode_notsupp,
1799 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
1800 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1801 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
1802 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
1803 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
1804 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp,
1805 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1806 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1807 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
1808 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
1809 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone,
1810 };
1811
1812 static inline bool
1813 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1814 {
1815 if (op->opnum < FIRST_NFS4_OP)
1816 return false;
1817 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1818 return false;
1819 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1820 return false;
1821 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1822 return false;
1823 return true;
1824 }
1825
1826 static __be32
1827 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1828 {
1829 DECODE_HEAD;
1830 struct nfsd4_op *op;
1831 bool cachethis = false;
1832 int auth_slack= argp->rqstp->rq_auth_slack;
1833 int max_reply = auth_slack + 8; /* opcnt, status */
1834 int readcount = 0;
1835 int readbytes = 0;
1836 int i;
1837
1838 READ_BUF(4);
1839 argp->taglen = be32_to_cpup(p++);
1840 READ_BUF(argp->taglen);
1841 SAVEMEM(argp->tag, argp->taglen);
1842 READ_BUF(8);
1843 argp->minorversion = be32_to_cpup(p++);
1844 argp->opcnt = be32_to_cpup(p++);
1845 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1846
1847 if (argp->taglen > NFSD4_MAX_TAGLEN)
1848 goto xdr_error;
1849 if (argp->opcnt > 100)
1850 goto xdr_error;
1851
1852 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1853 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1854 if (!argp->ops) {
1855 argp->ops = argp->iops;
1856 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1857 goto xdr_error;
1858 }
1859 }
1860
1861 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1862 argp->opcnt = 0;
1863
1864 for (i = 0; i < argp->opcnt; i++) {
1865 op = &argp->ops[i];
1866 op->replay = NULL;
1867
1868 READ_BUF(4);
1869 op->opnum = be32_to_cpup(p++);
1870
1871 if (nfsd4_opnum_in_range(argp, op))
1872 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1873 else {
1874 op->opnum = OP_ILLEGAL;
1875 op->status = nfserr_op_illegal;
1876 }
1877 /*
1878 * We'll try to cache the result in the DRC if any one
1879 * op in the compound wants to be cached:
1880 */
1881 cachethis |= nfsd4_cache_this_op(op);
1882
1883 if (op->opnum == OP_READ) {
1884 readcount++;
1885 readbytes += nfsd4_max_reply(argp->rqstp, op);
1886 } else
1887 max_reply += nfsd4_max_reply(argp->rqstp, op);
1888 /*
1889 * OP_LOCK may return a conflicting lock. (Special case
1890 * because it will just skip encoding this if it runs
1891 * out of xdr buffer space, and it is the only operation
1892 * that behaves this way.)
1893 */
1894 if (op->opnum == OP_LOCK)
1895 max_reply += NFS4_OPAQUE_LIMIT;
1896
1897 if (op->status) {
1898 argp->opcnt = i+1;
1899 break;
1900 }
1901 }
1902 /* Sessions make the DRC unnecessary: */
1903 if (argp->minorversion)
1904 cachethis = false;
1905 svc_reserve(argp->rqstp, max_reply + readbytes);
1906 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1907
1908 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1909 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1910
1911 DECODE_TAIL;
1912 }
1913
1914 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1915 {
1916 if (IS_I_VERSION(inode)) {
1917 p = xdr_encode_hyper(p, inode->i_version);
1918 } else {
1919 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1920 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1921 }
1922 return p;
1923 }
1924
1925 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1926 {
1927 *p++ = cpu_to_be32(c->atomic);
1928 if (c->change_supported) {
1929 p = xdr_encode_hyper(p, c->before_change);
1930 p = xdr_encode_hyper(p, c->after_change);
1931 } else {
1932 *p++ = cpu_to_be32(c->before_ctime_sec);
1933 *p++ = cpu_to_be32(c->before_ctime_nsec);
1934 *p++ = cpu_to_be32(c->after_ctime_sec);
1935 *p++ = cpu_to_be32(c->after_ctime_nsec);
1936 }
1937 return p;
1938 }
1939
1940 /* Encode as an array of strings the string given with components
1941 * separated @sep, escaped with esc_enter and esc_exit.
1942 */
1943 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1944 char *components, char esc_enter,
1945 char esc_exit)
1946 {
1947 __be32 *p;
1948 __be32 pathlen;
1949 int pathlen_offset;
1950 int strlen, count=0;
1951 char *str, *end, *next;
1952
1953 dprintk("nfsd4_encode_components(%s)\n", components);
1954
1955 pathlen_offset = xdr->buf->len;
1956 p = xdr_reserve_space(xdr, 4);
1957 if (!p)
1958 return nfserr_resource;
1959 p++; /* We will fill this in with @count later */
1960
1961 end = str = components;
1962 while (*end) {
1963 bool found_esc = false;
1964
1965 /* try to parse as esc_start, ..., esc_end, sep */
1966 if (*str == esc_enter) {
1967 for (; *end && (*end != esc_exit); end++)
1968 /* find esc_exit or end of string */;
1969 next = end + 1;
1970 if (*end && (!*next || *next == sep)) {
1971 str++;
1972 found_esc = true;
1973 }
1974 }
1975
1976 if (!found_esc)
1977 for (; *end && (*end != sep); end++)
1978 /* find sep or end of string */;
1979
1980 strlen = end - str;
1981 if (strlen) {
1982 p = xdr_reserve_space(xdr, strlen + 4);
1983 if (!p)
1984 return nfserr_resource;
1985 p = xdr_encode_opaque(p, str, strlen);
1986 count++;
1987 }
1988 else
1989 end++;
1990 if (found_esc)
1991 end = next;
1992
1993 str = end;
1994 }
1995 pathlen = htonl(count);
1996 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1997 return 0;
1998 }
1999
2000 /* Encode as an array of strings the string given with components
2001 * separated @sep.
2002 */
2003 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2004 char *components)
2005 {
2006 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2007 }
2008
2009 /*
2010 * encode a location element of a fs_locations structure
2011 */
2012 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2013 struct nfsd4_fs_location *location)
2014 {
2015 __be32 status;
2016
2017 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2018 '[', ']');
2019 if (status)
2020 return status;
2021 status = nfsd4_encode_components(xdr, '/', location->path);
2022 if (status)
2023 return status;
2024 return 0;
2025 }
2026
2027 /*
2028 * Encode a path in RFC3530 'pathname4' format
2029 */
2030 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2031 const struct path *root,
2032 const struct path *path)
2033 {
2034 struct path cur = *path;
2035 __be32 *p;
2036 struct dentry **components = NULL;
2037 unsigned int ncomponents = 0;
2038 __be32 err = nfserr_jukebox;
2039
2040 dprintk("nfsd4_encode_components(");
2041
2042 path_get(&cur);
2043 /* First walk the path up to the nfsd root, and store the
2044 * dentries/path components in an array.
2045 */
2046 for (;;) {
2047 if (path_equal(&cur, root))
2048 break;
2049 if (cur.dentry == cur.mnt->mnt_root) {
2050 if (follow_up(&cur))
2051 continue;
2052 goto out_free;
2053 }
2054 if ((ncomponents & 15) == 0) {
2055 struct dentry **new;
2056 new = krealloc(components,
2057 sizeof(*new) * (ncomponents + 16),
2058 GFP_KERNEL);
2059 if (!new)
2060 goto out_free;
2061 components = new;
2062 }
2063 components[ncomponents++] = cur.dentry;
2064 cur.dentry = dget_parent(cur.dentry);
2065 }
2066 err = nfserr_resource;
2067 p = xdr_reserve_space(xdr, 4);
2068 if (!p)
2069 goto out_free;
2070 *p++ = cpu_to_be32(ncomponents);
2071
2072 while (ncomponents) {
2073 struct dentry *dentry = components[ncomponents - 1];
2074 unsigned int len;
2075
2076 spin_lock(&dentry->d_lock);
2077 len = dentry->d_name.len;
2078 p = xdr_reserve_space(xdr, len + 4);
2079 if (!p) {
2080 spin_unlock(&dentry->d_lock);
2081 goto out_free;
2082 }
2083 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2084 dprintk("/%pd", dentry);
2085 spin_unlock(&dentry->d_lock);
2086 dput(dentry);
2087 ncomponents--;
2088 }
2089
2090 err = 0;
2091 out_free:
2092 dprintk(")\n");
2093 while (ncomponents)
2094 dput(components[--ncomponents]);
2095 kfree(components);
2096 path_put(&cur);
2097 return err;
2098 }
2099
2100 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2101 struct svc_rqst *rqstp, const struct path *path)
2102 {
2103 struct svc_export *exp_ps;
2104 __be32 res;
2105
2106 exp_ps = rqst_find_fsidzero_export(rqstp);
2107 if (IS_ERR(exp_ps))
2108 return nfserrno(PTR_ERR(exp_ps));
2109 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2110 exp_put(exp_ps);
2111 return res;
2112 }
2113
2114 /*
2115 * encode a fs_locations structure
2116 */
2117 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2118 struct svc_rqst *rqstp, struct svc_export *exp)
2119 {
2120 __be32 status;
2121 int i;
2122 __be32 *p;
2123 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2124
2125 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2126 if (status)
2127 return status;
2128 p = xdr_reserve_space(xdr, 4);
2129 if (!p)
2130 return nfserr_resource;
2131 *p++ = cpu_to_be32(fslocs->locations_count);
2132 for (i=0; i<fslocs->locations_count; i++) {
2133 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2134 if (status)
2135 return status;
2136 }
2137 return 0;
2138 }
2139
2140 static u32 nfs4_file_type(umode_t mode)
2141 {
2142 switch (mode & S_IFMT) {
2143 case S_IFIFO: return NF4FIFO;
2144 case S_IFCHR: return NF4CHR;
2145 case S_IFDIR: return NF4DIR;
2146 case S_IFBLK: return NF4BLK;
2147 case S_IFLNK: return NF4LNK;
2148 case S_IFREG: return NF4REG;
2149 case S_IFSOCK: return NF4SOCK;
2150 default: return NF4BAD;
2151 };
2152 }
2153
2154 static inline __be32
2155 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2156 struct nfs4_ace *ace)
2157 {
2158 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2159 return nfs4_acl_write_who(xdr, ace->whotype);
2160 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2161 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2162 else
2163 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2164 }
2165
2166 static inline __be32
2167 nfsd4_encode_layout_type(struct xdr_stream *xdr, enum pnfs_layouttype layout_type)
2168 {
2169 __be32 *p;
2170
2171 if (layout_type) {
2172 p = xdr_reserve_space(xdr, 8);
2173 if (!p)
2174 return nfserr_resource;
2175 *p++ = cpu_to_be32(1);
2176 *p++ = cpu_to_be32(layout_type);
2177 } else {
2178 p = xdr_reserve_space(xdr, 4);
2179 if (!p)
2180 return nfserr_resource;
2181 *p++ = cpu_to_be32(0);
2182 }
2183
2184 return 0;
2185 }
2186
2187 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2188 FATTR4_WORD0_RDATTR_ERROR)
2189 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2190 #define WORD2_ABSENT_FS_ATTRS 0
2191
2192 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2193 static inline __be32
2194 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2195 void *context, int len)
2196 {
2197 __be32 *p;
2198
2199 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2200 if (!p)
2201 return nfserr_resource;
2202
2203 /*
2204 * For now we use a 0 here to indicate the null translation; in
2205 * the future we may place a call to translation code here.
2206 */
2207 *p++ = cpu_to_be32(0); /* lfs */
2208 *p++ = cpu_to_be32(0); /* pi */
2209 p = xdr_encode_opaque(p, context, len);
2210 return 0;
2211 }
2212 #else
2213 static inline __be32
2214 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2215 void *context, int len)
2216 { return 0; }
2217 #endif
2218
2219 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2220 {
2221 /* As per referral draft: */
2222 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2223 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2224 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2225 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2226 *rdattr_err = NFSERR_MOVED;
2227 else
2228 return nfserr_moved;
2229 }
2230 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2231 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2232 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2233 return 0;
2234 }
2235
2236
2237 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2238 {
2239 struct path path = exp->ex_path;
2240 int err;
2241
2242 path_get(&path);
2243 while (follow_up(&path)) {
2244 if (path.dentry != path.mnt->mnt_root)
2245 break;
2246 }
2247 err = vfs_getattr(&path, stat);
2248 path_put(&path);
2249 return err;
2250 }
2251
2252 static __be32
2253 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2254 {
2255 __be32 *p;
2256
2257 if (bmval2) {
2258 p = xdr_reserve_space(xdr, 16);
2259 if (!p)
2260 goto out_resource;
2261 *p++ = cpu_to_be32(3);
2262 *p++ = cpu_to_be32(bmval0);
2263 *p++ = cpu_to_be32(bmval1);
2264 *p++ = cpu_to_be32(bmval2);
2265 } else if (bmval1) {
2266 p = xdr_reserve_space(xdr, 12);
2267 if (!p)
2268 goto out_resource;
2269 *p++ = cpu_to_be32(2);
2270 *p++ = cpu_to_be32(bmval0);
2271 *p++ = cpu_to_be32(bmval1);
2272 } else {
2273 p = xdr_reserve_space(xdr, 8);
2274 if (!p)
2275 goto out_resource;
2276 *p++ = cpu_to_be32(1);
2277 *p++ = cpu_to_be32(bmval0);
2278 }
2279
2280 return 0;
2281 out_resource:
2282 return nfserr_resource;
2283 }
2284
2285 /*
2286 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2287 * ourselves.
2288 */
2289 static __be32
2290 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2291 struct svc_export *exp,
2292 struct dentry *dentry, u32 *bmval,
2293 struct svc_rqst *rqstp, int ignore_crossmnt)
2294 {
2295 u32 bmval0 = bmval[0];
2296 u32 bmval1 = bmval[1];
2297 u32 bmval2 = bmval[2];
2298 struct kstat stat;
2299 struct svc_fh *tempfh = NULL;
2300 struct kstatfs statfs;
2301 __be32 *p;
2302 int starting_len = xdr->buf->len;
2303 int attrlen_offset;
2304 __be32 attrlen;
2305 u32 dummy;
2306 u64 dummy64;
2307 u32 rdattr_err = 0;
2308 __be32 status;
2309 int err;
2310 struct nfs4_acl *acl = NULL;
2311 void *context = NULL;
2312 int contextlen;
2313 bool contextsupport = false;
2314 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2315 u32 minorversion = resp->cstate.minorversion;
2316 struct path path = {
2317 .mnt = exp->ex_path.mnt,
2318 .dentry = dentry,
2319 };
2320 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2321
2322 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2323 BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2324 BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2325 BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2326
2327 if (exp->ex_fslocs.migrated) {
2328 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2329 if (status)
2330 goto out;
2331 }
2332
2333 err = vfs_getattr(&path, &stat);
2334 if (err)
2335 goto out_nfserr;
2336 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2337 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2338 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2339 FATTR4_WORD1_SPACE_TOTAL))) {
2340 err = vfs_statfs(&path, &statfs);
2341 if (err)
2342 goto out_nfserr;
2343 }
2344 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2345 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2346 status = nfserr_jukebox;
2347 if (!tempfh)
2348 goto out;
2349 fh_init(tempfh, NFS4_FHSIZE);
2350 status = fh_compose(tempfh, exp, dentry, NULL);
2351 if (status)
2352 goto out;
2353 fhp = tempfh;
2354 }
2355 if (bmval0 & FATTR4_WORD0_ACL) {
2356 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2357 if (err == -EOPNOTSUPP)
2358 bmval0 &= ~FATTR4_WORD0_ACL;
2359 else if (err == -EINVAL) {
2360 status = nfserr_attrnotsupp;
2361 goto out;
2362 } else if (err != 0)
2363 goto out_nfserr;
2364 }
2365
2366 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2367 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2368 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2369 err = security_inode_getsecctx(d_inode(dentry),
2370 &context, &contextlen);
2371 contextsupport = (err == 0);
2372 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2373 if (err == -EOPNOTSUPP)
2374 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2375 else if (err)
2376 goto out_nfserr;
2377 }
2378 }
2379 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2380
2381 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2382 if (status)
2383 goto out;
2384
2385 attrlen_offset = xdr->buf->len;
2386 p = xdr_reserve_space(xdr, 4);
2387 if (!p)
2388 goto out_resource;
2389 p++; /* to be backfilled later */
2390
2391 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2392 u32 word0 = nfsd_suppattrs0(minorversion);
2393 u32 word1 = nfsd_suppattrs1(minorversion);
2394 u32 word2 = nfsd_suppattrs2(minorversion);
2395
2396 if (!IS_POSIXACL(dentry->d_inode))
2397 word0 &= ~FATTR4_WORD0_ACL;
2398 if (!contextsupport)
2399 word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2400 if (!word2) {
2401 p = xdr_reserve_space(xdr, 12);
2402 if (!p)
2403 goto out_resource;
2404 *p++ = cpu_to_be32(2);
2405 *p++ = cpu_to_be32(word0);
2406 *p++ = cpu_to_be32(word1);
2407 } else {
2408 p = xdr_reserve_space(xdr, 16);
2409 if (!p)
2410 goto out_resource;
2411 *p++ = cpu_to_be32(3);
2412 *p++ = cpu_to_be32(word0);
2413 *p++ = cpu_to_be32(word1);
2414 *p++ = cpu_to_be32(word2);
2415 }
2416 }
2417 if (bmval0 & FATTR4_WORD0_TYPE) {
2418 p = xdr_reserve_space(xdr, 4);
2419 if (!p)
2420 goto out_resource;
2421 dummy = nfs4_file_type(stat.mode);
2422 if (dummy == NF4BAD) {
2423 status = nfserr_serverfault;
2424 goto out;
2425 }
2426 *p++ = cpu_to_be32(dummy);
2427 }
2428 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2429 p = xdr_reserve_space(xdr, 4);
2430 if (!p)
2431 goto out_resource;
2432 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2433 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2434 else
2435 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2436 NFS4_FH_VOL_RENAME);
2437 }
2438 if (bmval0 & FATTR4_WORD0_CHANGE) {
2439 p = xdr_reserve_space(xdr, 8);
2440 if (!p)
2441 goto out_resource;
2442 p = encode_change(p, &stat, d_inode(dentry));
2443 }
2444 if (bmval0 & FATTR4_WORD0_SIZE) {
2445 p = xdr_reserve_space(xdr, 8);
2446 if (!p)
2447 goto out_resource;
2448 p = xdr_encode_hyper(p, stat.size);
2449 }
2450 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2451 p = xdr_reserve_space(xdr, 4);
2452 if (!p)
2453 goto out_resource;
2454 *p++ = cpu_to_be32(1);
2455 }
2456 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2457 p = xdr_reserve_space(xdr, 4);
2458 if (!p)
2459 goto out_resource;
2460 *p++ = cpu_to_be32(1);
2461 }
2462 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2463 p = xdr_reserve_space(xdr, 4);
2464 if (!p)
2465 goto out_resource;
2466 *p++ = cpu_to_be32(0);
2467 }
2468 if (bmval0 & FATTR4_WORD0_FSID) {
2469 p = xdr_reserve_space(xdr, 16);
2470 if (!p)
2471 goto out_resource;
2472 if (exp->ex_fslocs.migrated) {
2473 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2474 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2475 } else switch(fsid_source(fhp)) {
2476 case FSIDSOURCE_FSID:
2477 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2478 p = xdr_encode_hyper(p, (u64)0);
2479 break;
2480 case FSIDSOURCE_DEV:
2481 *p++ = cpu_to_be32(0);
2482 *p++ = cpu_to_be32(MAJOR(stat.dev));
2483 *p++ = cpu_to_be32(0);
2484 *p++ = cpu_to_be32(MINOR(stat.dev));
2485 break;
2486 case FSIDSOURCE_UUID:
2487 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2488 EX_UUID_LEN);
2489 break;
2490 }
2491 }
2492 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2493 p = xdr_reserve_space(xdr, 4);
2494 if (!p)
2495 goto out_resource;
2496 *p++ = cpu_to_be32(0);
2497 }
2498 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2499 p = xdr_reserve_space(xdr, 4);
2500 if (!p)
2501 goto out_resource;
2502 *p++ = cpu_to_be32(nn->nfsd4_lease);
2503 }
2504 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2505 p = xdr_reserve_space(xdr, 4);
2506 if (!p)
2507 goto out_resource;
2508 *p++ = cpu_to_be32(rdattr_err);
2509 }
2510 if (bmval0 & FATTR4_WORD0_ACL) {
2511 struct nfs4_ace *ace;
2512
2513 if (acl == NULL) {
2514 p = xdr_reserve_space(xdr, 4);
2515 if (!p)
2516 goto out_resource;
2517
2518 *p++ = cpu_to_be32(0);
2519 goto out_acl;
2520 }
2521 p = xdr_reserve_space(xdr, 4);
2522 if (!p)
2523 goto out_resource;
2524 *p++ = cpu_to_be32(acl->naces);
2525
2526 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2527 p = xdr_reserve_space(xdr, 4*3);
2528 if (!p)
2529 goto out_resource;
2530 *p++ = cpu_to_be32(ace->type);
2531 *p++ = cpu_to_be32(ace->flag);
2532 *p++ = cpu_to_be32(ace->access_mask &
2533 NFS4_ACE_MASK_ALL);
2534 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2535 if (status)
2536 goto out;
2537 }
2538 }
2539 out_acl:
2540 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2541 p = xdr_reserve_space(xdr, 4);
2542 if (!p)
2543 goto out_resource;
2544 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2545 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2546 }
2547 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2548 p = xdr_reserve_space(xdr, 4);
2549 if (!p)
2550 goto out_resource;
2551 *p++ = cpu_to_be32(1);
2552 }
2553 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2554 p = xdr_reserve_space(xdr, 4);
2555 if (!p)
2556 goto out_resource;
2557 *p++ = cpu_to_be32(0);
2558 }
2559 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2560 p = xdr_reserve_space(xdr, 4);
2561 if (!p)
2562 goto out_resource;
2563 *p++ = cpu_to_be32(1);
2564 }
2565 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2566 p = xdr_reserve_space(xdr, 4);
2567 if (!p)
2568 goto out_resource;
2569 *p++ = cpu_to_be32(1);
2570 }
2571 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2572 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2573 if (!p)
2574 goto out_resource;
2575 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2576 fhp->fh_handle.fh_size);
2577 }
2578 if (bmval0 & FATTR4_WORD0_FILEID) {
2579 p = xdr_reserve_space(xdr, 8);
2580 if (!p)
2581 goto out_resource;
2582 p = xdr_encode_hyper(p, stat.ino);
2583 }
2584 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2585 p = xdr_reserve_space(xdr, 8);
2586 if (!p)
2587 goto out_resource;
2588 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2589 }
2590 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2591 p = xdr_reserve_space(xdr, 8);
2592 if (!p)
2593 goto out_resource;
2594 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2595 }
2596 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2597 p = xdr_reserve_space(xdr, 8);
2598 if (!p)
2599 goto out_resource;
2600 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2601 }
2602 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2603 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2604 if (status)
2605 goto out;
2606 }
2607 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2608 p = xdr_reserve_space(xdr, 4);
2609 if (!p)
2610 goto out_resource;
2611 *p++ = cpu_to_be32(1);
2612 }
2613 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2614 p = xdr_reserve_space(xdr, 8);
2615 if (!p)
2616 goto out_resource;
2617 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2618 }
2619 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2620 p = xdr_reserve_space(xdr, 4);
2621 if (!p)
2622 goto out_resource;
2623 *p++ = cpu_to_be32(255);
2624 }
2625 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2626 p = xdr_reserve_space(xdr, 4);
2627 if (!p)
2628 goto out_resource;
2629 *p++ = cpu_to_be32(statfs.f_namelen);
2630 }
2631 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2632 p = xdr_reserve_space(xdr, 8);
2633 if (!p)
2634 goto out_resource;
2635 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2636 }
2637 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2638 p = xdr_reserve_space(xdr, 8);
2639 if (!p)
2640 goto out_resource;
2641 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2642 }
2643 if (bmval1 & FATTR4_WORD1_MODE) {
2644 p = xdr_reserve_space(xdr, 4);
2645 if (!p)
2646 goto out_resource;
2647 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2648 }
2649 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2650 p = xdr_reserve_space(xdr, 4);
2651 if (!p)
2652 goto out_resource;
2653 *p++ = cpu_to_be32(1);
2654 }
2655 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2656 p = xdr_reserve_space(xdr, 4);
2657 if (!p)
2658 goto out_resource;
2659 *p++ = cpu_to_be32(stat.nlink);
2660 }
2661 if (bmval1 & FATTR4_WORD1_OWNER) {
2662 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2663 if (status)
2664 goto out;
2665 }
2666 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2667 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2668 if (status)
2669 goto out;
2670 }
2671 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2672 p = xdr_reserve_space(xdr, 8);
2673 if (!p)
2674 goto out_resource;
2675 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2676 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2677 }
2678 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2679 p = xdr_reserve_space(xdr, 8);
2680 if (!p)
2681 goto out_resource;
2682 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2683 p = xdr_encode_hyper(p, dummy64);
2684 }
2685 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2686 p = xdr_reserve_space(xdr, 8);
2687 if (!p)
2688 goto out_resource;
2689 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2690 p = xdr_encode_hyper(p, dummy64);
2691 }
2692 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2693 p = xdr_reserve_space(xdr, 8);
2694 if (!p)
2695 goto out_resource;
2696 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2697 p = xdr_encode_hyper(p, dummy64);
2698 }
2699 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2700 p = xdr_reserve_space(xdr, 8);
2701 if (!p)
2702 goto out_resource;
2703 dummy64 = (u64)stat.blocks << 9;
2704 p = xdr_encode_hyper(p, dummy64);
2705 }
2706 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2707 p = xdr_reserve_space(xdr, 12);
2708 if (!p)
2709 goto out_resource;
2710 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2711 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2712 }
2713 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2714 p = xdr_reserve_space(xdr, 12);
2715 if (!p)
2716 goto out_resource;
2717 *p++ = cpu_to_be32(0);
2718 *p++ = cpu_to_be32(1);
2719 *p++ = cpu_to_be32(0);
2720 }
2721 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2722 p = xdr_reserve_space(xdr, 12);
2723 if (!p)
2724 goto out_resource;
2725 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2726 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2727 }
2728 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2729 p = xdr_reserve_space(xdr, 12);
2730 if (!p)
2731 goto out_resource;
2732 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2733 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2734 }
2735 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2736 struct kstat parent_stat;
2737 u64 ino = stat.ino;
2738
2739 p = xdr_reserve_space(xdr, 8);
2740 if (!p)
2741 goto out_resource;
2742 /*
2743 * Get parent's attributes if not ignoring crossmount
2744 * and this is the root of a cross-mounted filesystem.
2745 */
2746 if (ignore_crossmnt == 0 &&
2747 dentry == exp->ex_path.mnt->mnt_root) {
2748 err = get_parent_attributes(exp, &parent_stat);
2749 if (err)
2750 goto out_nfserr;
2751 ino = parent_stat.ino;
2752 }
2753 p = xdr_encode_hyper(p, ino);
2754 }
2755 #ifdef CONFIG_NFSD_PNFS
2756 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2757 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2758 if (status)
2759 goto out;
2760 }
2761
2762 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2763 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2764 if (status)
2765 goto out;
2766 }
2767
2768 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2769 p = xdr_reserve_space(xdr, 4);
2770 if (!p)
2771 goto out_resource;
2772 *p++ = cpu_to_be32(stat.blksize);
2773 }
2774 #endif /* CONFIG_NFSD_PNFS */
2775 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2776 status = nfsd4_encode_bitmap(xdr, NFSD_SUPPATTR_EXCLCREAT_WORD0,
2777 NFSD_SUPPATTR_EXCLCREAT_WORD1,
2778 NFSD_SUPPATTR_EXCLCREAT_WORD2);
2779 if (status)
2780 goto out;
2781 }
2782
2783 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2784 status = nfsd4_encode_security_label(xdr, rqstp, context,
2785 contextlen);
2786 if (status)
2787 goto out;
2788 }
2789
2790 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2791 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2792 status = nfs_ok;
2793
2794 out:
2795 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2796 if (context)
2797 security_release_secctx(context, contextlen);
2798 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2799 kfree(acl);
2800 if (tempfh) {
2801 fh_put(tempfh);
2802 kfree(tempfh);
2803 }
2804 if (status)
2805 xdr_truncate_encode(xdr, starting_len);
2806 return status;
2807 out_nfserr:
2808 status = nfserrno(err);
2809 goto out;
2810 out_resource:
2811 status = nfserr_resource;
2812 goto out;
2813 }
2814
2815 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2816 struct xdr_buf *buf, __be32 *p, int bytes)
2817 {
2818 xdr->scratch.iov_len = 0;
2819 memset(buf, 0, sizeof(struct xdr_buf));
2820 buf->head[0].iov_base = p;
2821 buf->head[0].iov_len = 0;
2822 buf->len = 0;
2823 xdr->buf = buf;
2824 xdr->iov = buf->head;
2825 xdr->p = p;
2826 xdr->end = (void *)p + bytes;
2827 buf->buflen = bytes;
2828 }
2829
2830 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2831 struct svc_fh *fhp, struct svc_export *exp,
2832 struct dentry *dentry, u32 *bmval,
2833 struct svc_rqst *rqstp, int ignore_crossmnt)
2834 {
2835 struct xdr_buf dummy;
2836 struct xdr_stream xdr;
2837 __be32 ret;
2838
2839 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2840 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2841 ignore_crossmnt);
2842 *p = xdr.p;
2843 return ret;
2844 }
2845
2846 static inline int attributes_need_mount(u32 *bmval)
2847 {
2848 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2849 return 1;
2850 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2851 return 1;
2852 return 0;
2853 }
2854
2855 static __be32
2856 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2857 const char *name, int namlen)
2858 {
2859 struct svc_export *exp = cd->rd_fhp->fh_export;
2860 struct dentry *dentry;
2861 __be32 nfserr;
2862 int ignore_crossmnt = 0;
2863
2864 dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2865 if (IS_ERR(dentry))
2866 return nfserrno(PTR_ERR(dentry));
2867 if (d_really_is_negative(dentry)) {
2868 /*
2869 * we're not holding the i_mutex here, so there's
2870 * a window where this directory entry could have gone
2871 * away.
2872 */
2873 dput(dentry);
2874 return nfserr_noent;
2875 }
2876
2877 exp_get(exp);
2878 /*
2879 * In the case of a mountpoint, the client may be asking for
2880 * attributes that are only properties of the underlying filesystem
2881 * as opposed to the cross-mounted file system. In such a case,
2882 * we will not follow the cross mount and will fill the attribtutes
2883 * directly from the mountpoint dentry.
2884 */
2885 if (nfsd_mountpoint(dentry, exp)) {
2886 int err;
2887
2888 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2889 && !attributes_need_mount(cd->rd_bmval)) {
2890 ignore_crossmnt = 1;
2891 goto out_encode;
2892 }
2893 /*
2894 * Why the heck aren't we just using nfsd_lookup??
2895 * Different "."/".." handling? Something else?
2896 * At least, add a comment here to explain....
2897 */
2898 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2899 if (err) {
2900 nfserr = nfserrno(err);
2901 goto out_put;
2902 }
2903 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2904 if (nfserr)
2905 goto out_put;
2906
2907 }
2908 out_encode:
2909 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2910 cd->rd_rqstp, ignore_crossmnt);
2911 out_put:
2912 dput(dentry);
2913 exp_put(exp);
2914 return nfserr;
2915 }
2916
2917 static __be32 *
2918 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2919 {
2920 __be32 *p;
2921
2922 p = xdr_reserve_space(xdr, 20);
2923 if (!p)
2924 return NULL;
2925 *p++ = htonl(2);
2926 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2927 *p++ = htonl(0); /* bmval1 */
2928
2929 *p++ = htonl(4); /* attribute length */
2930 *p++ = nfserr; /* no htonl */
2931 return p;
2932 }
2933
2934 static int
2935 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2936 loff_t offset, u64 ino, unsigned int d_type)
2937 {
2938 struct readdir_cd *ccd = ccdv;
2939 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2940 struct xdr_stream *xdr = cd->xdr;
2941 int start_offset = xdr->buf->len;
2942 int cookie_offset;
2943 u32 name_and_cookie;
2944 int entry_bytes;
2945 __be32 nfserr = nfserr_toosmall;
2946 __be64 wire_offset;
2947 __be32 *p;
2948
2949 /* In nfsv4, "." and ".." never make it onto the wire.. */
2950 if (name && isdotent(name, namlen)) {
2951 cd->common.err = nfs_ok;
2952 return 0;
2953 }
2954
2955 if (cd->cookie_offset) {
2956 wire_offset = cpu_to_be64(offset);
2957 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2958 &wire_offset, 8);
2959 }
2960
2961 p = xdr_reserve_space(xdr, 4);
2962 if (!p)
2963 goto fail;
2964 *p++ = xdr_one; /* mark entry present */
2965 cookie_offset = xdr->buf->len;
2966 p = xdr_reserve_space(xdr, 3*4 + namlen);
2967 if (!p)
2968 goto fail;
2969 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
2970 p = xdr_encode_array(p, name, namlen); /* name length & name */
2971
2972 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2973 switch (nfserr) {
2974 case nfs_ok:
2975 break;
2976 case nfserr_resource:
2977 nfserr = nfserr_toosmall;
2978 goto fail;
2979 case nfserr_noent:
2980 xdr_truncate_encode(xdr, start_offset);
2981 goto skip_entry;
2982 default:
2983 /*
2984 * If the client requested the RDATTR_ERROR attribute,
2985 * we stuff the error code into this attribute
2986 * and continue. If this attribute was not requested,
2987 * then in accordance with the spec, we fail the
2988 * entire READDIR operation(!)
2989 */
2990 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2991 goto fail;
2992 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2993 if (p == NULL) {
2994 nfserr = nfserr_toosmall;
2995 goto fail;
2996 }
2997 }
2998 nfserr = nfserr_toosmall;
2999 entry_bytes = xdr->buf->len - start_offset;
3000 if (entry_bytes > cd->rd_maxcount)
3001 goto fail;
3002 cd->rd_maxcount -= entry_bytes;
3003 /*
3004 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3005 * let's always let through the first entry, at least:
3006 */
3007 if (!cd->rd_dircount)
3008 goto fail;
3009 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3010 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3011 goto fail;
3012 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3013
3014 cd->cookie_offset = cookie_offset;
3015 skip_entry:
3016 cd->common.err = nfs_ok;
3017 return 0;
3018 fail:
3019 xdr_truncate_encode(xdr, start_offset);
3020 cd->common.err = nfserr;
3021 return -EINVAL;
3022 }
3023
3024 static __be32
3025 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3026 {
3027 __be32 *p;
3028
3029 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3030 if (!p)
3031 return nfserr_resource;
3032 *p++ = cpu_to_be32(sid->si_generation);
3033 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3034 sizeof(stateid_opaque_t));
3035 return 0;
3036 }
3037
3038 static __be32
3039 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3040 {
3041 struct xdr_stream *xdr = &resp->xdr;
3042 __be32 *p;
3043
3044 if (!nfserr) {
3045 p = xdr_reserve_space(xdr, 8);
3046 if (!p)
3047 return nfserr_resource;
3048 *p++ = cpu_to_be32(access->ac_supported);
3049 *p++ = cpu_to_be32(access->ac_resp_access);
3050 }
3051 return nfserr;
3052 }
3053
3054 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3055 {
3056 struct xdr_stream *xdr = &resp->xdr;
3057 __be32 *p;
3058
3059 if (!nfserr) {
3060 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3061 if (!p)
3062 return nfserr_resource;
3063 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3064 NFS4_MAX_SESSIONID_LEN);
3065 *p++ = cpu_to_be32(bcts->dir);
3066 /* Upshifting from TCP to RDMA is not supported */
3067 *p++ = cpu_to_be32(0);
3068 }
3069 return nfserr;
3070 }
3071
3072 static __be32
3073 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3074 {
3075 struct xdr_stream *xdr = &resp->xdr;
3076
3077 if (!nfserr)
3078 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3079
3080 return nfserr;
3081 }
3082
3083
3084 static __be32
3085 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3086 {
3087 struct xdr_stream *xdr = &resp->xdr;
3088 __be32 *p;
3089
3090 if (!nfserr) {
3091 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3092 if (!p)
3093 return nfserr_resource;
3094 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3095 NFS4_VERIFIER_SIZE);
3096 }
3097 return nfserr;
3098 }
3099
3100 static __be32
3101 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3102 {
3103 struct xdr_stream *xdr = &resp->xdr;
3104 __be32 *p;
3105
3106 if (!nfserr) {
3107 p = xdr_reserve_space(xdr, 20);
3108 if (!p)
3109 return nfserr_resource;
3110 encode_cinfo(p, &create->cr_cinfo);
3111 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3112 create->cr_bmval[1], create->cr_bmval[2]);
3113 }
3114 return nfserr;
3115 }
3116
3117 static __be32
3118 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3119 {
3120 struct svc_fh *fhp = getattr->ga_fhp;
3121 struct xdr_stream *xdr = &resp->xdr;
3122
3123 if (nfserr)
3124 return nfserr;
3125
3126 nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3127 getattr->ga_bmval,
3128 resp->rqstp, 0);
3129 return nfserr;
3130 }
3131
3132 static __be32
3133 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3134 {
3135 struct xdr_stream *xdr = &resp->xdr;
3136 struct svc_fh *fhp = *fhpp;
3137 unsigned int len;
3138 __be32 *p;
3139
3140 if (!nfserr) {
3141 len = fhp->fh_handle.fh_size;
3142 p = xdr_reserve_space(xdr, len + 4);
3143 if (!p)
3144 return nfserr_resource;
3145 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3146 }
3147 return nfserr;
3148 }
3149
3150 /*
3151 * Including all fields other than the name, a LOCK4denied structure requires
3152 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3153 */
3154 static __be32
3155 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3156 {
3157 struct xdr_netobj *conf = &ld->ld_owner;
3158 __be32 *p;
3159
3160 again:
3161 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3162 if (!p) {
3163 /*
3164 * Don't fail to return the result just because we can't
3165 * return the conflicting open:
3166 */
3167 if (conf->len) {
3168 kfree(conf->data);
3169 conf->len = 0;
3170 conf->data = NULL;
3171 goto again;
3172 }
3173 return nfserr_resource;
3174 }
3175 p = xdr_encode_hyper(p, ld->ld_start);
3176 p = xdr_encode_hyper(p, ld->ld_length);
3177 *p++ = cpu_to_be32(ld->ld_type);
3178 if (conf->len) {
3179 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3180 p = xdr_encode_opaque(p, conf->data, conf->len);
3181 kfree(conf->data);
3182 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
3183 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3184 *p++ = cpu_to_be32(0); /* length of owner name */
3185 }
3186 return nfserr_denied;
3187 }
3188
3189 static __be32
3190 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3191 {
3192 struct xdr_stream *xdr = &resp->xdr;
3193
3194 if (!nfserr)
3195 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3196 else if (nfserr == nfserr_denied)
3197 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3198
3199 return nfserr;
3200 }
3201
3202 static __be32
3203 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3204 {
3205 struct xdr_stream *xdr = &resp->xdr;
3206
3207 if (nfserr == nfserr_denied)
3208 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3209 return nfserr;
3210 }
3211
3212 static __be32
3213 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3214 {
3215 struct xdr_stream *xdr = &resp->xdr;
3216
3217 if (!nfserr)
3218 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3219
3220 return nfserr;
3221 }
3222
3223
3224 static __be32
3225 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3226 {
3227 struct xdr_stream *xdr = &resp->xdr;
3228 __be32 *p;
3229
3230 if (!nfserr) {
3231 p = xdr_reserve_space(xdr, 20);
3232 if (!p)
3233 return nfserr_resource;
3234 p = encode_cinfo(p, &link->li_cinfo);
3235 }
3236 return nfserr;
3237 }
3238
3239
3240 static __be32
3241 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3242 {
3243 struct xdr_stream *xdr = &resp->xdr;
3244 __be32 *p;
3245
3246 if (nfserr)
3247 goto out;
3248
3249 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3250 if (nfserr)
3251 goto out;
3252 p = xdr_reserve_space(xdr, 24);
3253 if (!p)
3254 return nfserr_resource;
3255 p = encode_cinfo(p, &open->op_cinfo);
3256 *p++ = cpu_to_be32(open->op_rflags);
3257
3258 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3259 open->op_bmval[2]);
3260 if (nfserr)
3261 goto out;
3262
3263 p = xdr_reserve_space(xdr, 4);
3264 if (!p)
3265 return nfserr_resource;
3266
3267 *p++ = cpu_to_be32(open->op_delegate_type);
3268 switch (open->op_delegate_type) {
3269 case NFS4_OPEN_DELEGATE_NONE:
3270 break;
3271 case NFS4_OPEN_DELEGATE_READ:
3272 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3273 if (nfserr)
3274 return nfserr;
3275 p = xdr_reserve_space(xdr, 20);
3276 if (!p)
3277 return nfserr_resource;
3278 *p++ = cpu_to_be32(open->op_recall);
3279
3280 /*
3281 * TODO: ACE's in delegations
3282 */
3283 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3284 *p++ = cpu_to_be32(0);
3285 *p++ = cpu_to_be32(0);
3286 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3287 break;
3288 case NFS4_OPEN_DELEGATE_WRITE:
3289 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3290 if (nfserr)
3291 return nfserr;
3292 p = xdr_reserve_space(xdr, 32);
3293 if (!p)
3294 return nfserr_resource;
3295 *p++ = cpu_to_be32(0);
3296
3297 /*
3298 * TODO: space_limit's in delegations
3299 */
3300 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3301 *p++ = cpu_to_be32(~(u32)0);
3302 *p++ = cpu_to_be32(~(u32)0);
3303
3304 /*
3305 * TODO: ACE's in delegations
3306 */
3307 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3308 *p++ = cpu_to_be32(0);
3309 *p++ = cpu_to_be32(0);
3310 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3311 break;
3312 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3313 switch (open->op_why_no_deleg) {
3314 case WND4_CONTENTION:
3315 case WND4_RESOURCE:
3316 p = xdr_reserve_space(xdr, 8);
3317 if (!p)
3318 return nfserr_resource;
3319 *p++ = cpu_to_be32(open->op_why_no_deleg);
3320 /* deleg signaling not supported yet: */
3321 *p++ = cpu_to_be32(0);
3322 break;
3323 default:
3324 p = xdr_reserve_space(xdr, 4);
3325 if (!p)
3326 return nfserr_resource;
3327 *p++ = cpu_to_be32(open->op_why_no_deleg);
3328 }
3329 break;
3330 default:
3331 BUG();
3332 }
3333 /* XXX save filehandle here */
3334 out:
3335 return nfserr;
3336 }
3337
3338 static __be32
3339 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3340 {
3341 struct xdr_stream *xdr = &resp->xdr;
3342
3343 if (!nfserr)
3344 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3345
3346 return nfserr;
3347 }
3348
3349 static __be32
3350 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3351 {
3352 struct xdr_stream *xdr = &resp->xdr;
3353
3354 if (!nfserr)
3355 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3356
3357 return nfserr;
3358 }
3359
3360 static __be32 nfsd4_encode_splice_read(
3361 struct nfsd4_compoundres *resp,
3362 struct nfsd4_read *read,
3363 struct file *file, unsigned long maxcount)
3364 {
3365 struct xdr_stream *xdr = &resp->xdr;
3366 struct xdr_buf *buf = xdr->buf;
3367 u32 eof;
3368 long len;
3369 int space_left;
3370 __be32 nfserr;
3371 __be32 *p = xdr->p - 2;
3372
3373 /* Make sure there will be room for padding if needed */
3374 if (xdr->end - xdr->p < 1)
3375 return nfserr_resource;
3376
3377 len = maxcount;
3378 nfserr = nfsd_splice_read(read->rd_rqstp, file,
3379 read->rd_offset, &maxcount);
3380 if (nfserr) {
3381 /*
3382 * nfsd_splice_actor may have already messed with the
3383 * page length; reset it so as not to confuse
3384 * xdr_truncate_encode:
3385 */
3386 buf->page_len = 0;
3387 return nfserr;
3388 }
3389
3390 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3391 d_inode(read->rd_fhp->fh_dentry)->i_size);
3392
3393 *(p++) = htonl(eof);
3394 *(p++) = htonl(maxcount);
3395
3396 buf->page_len = maxcount;
3397 buf->len += maxcount;
3398 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3399 / PAGE_SIZE;
3400
3401 /* Use rest of head for padding and remaining ops: */
3402 buf->tail[0].iov_base = xdr->p;
3403 buf->tail[0].iov_len = 0;
3404 xdr->iov = buf->tail;
3405 if (maxcount&3) {
3406 int pad = 4 - (maxcount&3);
3407
3408 *(xdr->p++) = 0;
3409
3410 buf->tail[0].iov_base += maxcount&3;
3411 buf->tail[0].iov_len = pad;
3412 buf->len += pad;
3413 }
3414
3415 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3416 buf->buflen - buf->len);
3417 buf->buflen = buf->len + space_left;
3418 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3419
3420 return 0;
3421 }
3422
3423 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3424 struct nfsd4_read *read,
3425 struct file *file, unsigned long maxcount)
3426 {
3427 struct xdr_stream *xdr = &resp->xdr;
3428 u32 eof;
3429 int v;
3430 int starting_len = xdr->buf->len - 8;
3431 long len;
3432 int thislen;
3433 __be32 nfserr;
3434 __be32 tmp;
3435 __be32 *p;
3436 u32 zzz = 0;
3437 int pad;
3438
3439 len = maxcount;
3440 v = 0;
3441
3442 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3443 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3444 WARN_ON_ONCE(!p);
3445 resp->rqstp->rq_vec[v].iov_base = p;
3446 resp->rqstp->rq_vec[v].iov_len = thislen;
3447 v++;
3448 len -= thislen;
3449
3450 while (len) {
3451 thislen = min_t(long, len, PAGE_SIZE);
3452 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3453 WARN_ON_ONCE(!p);
3454 resp->rqstp->rq_vec[v].iov_base = p;
3455 resp->rqstp->rq_vec[v].iov_len = thislen;
3456 v++;
3457 len -= thislen;
3458 }
3459 read->rd_vlen = v;
3460
3461 len = maxcount;
3462 nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3463 read->rd_vlen, &maxcount);
3464 if (nfserr)
3465 return nfserr;
3466 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3467
3468 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3469 d_inode(read->rd_fhp->fh_dentry)->i_size);
3470
3471 tmp = htonl(eof);
3472 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3473 tmp = htonl(maxcount);
3474 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3475
3476 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3477 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3478 &zzz, pad);
3479 return 0;
3480
3481 }
3482
3483 static __be32
3484 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3485 struct nfsd4_read *read)
3486 {
3487 unsigned long maxcount;
3488 struct xdr_stream *xdr = &resp->xdr;
3489 struct file *file = read->rd_filp;
3490 int starting_len = xdr->buf->len;
3491 struct raparms *ra = NULL;
3492 __be32 *p;
3493
3494 if (nfserr)
3495 goto out;
3496
3497 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3498 if (!p) {
3499 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3500 nfserr = nfserr_resource;
3501 goto out;
3502 }
3503 if (resp->xdr.buf->page_len &&
3504 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3505 WARN_ON_ONCE(1);
3506 nfserr = nfserr_resource;
3507 goto out;
3508 }
3509 xdr_commit_encode(xdr);
3510
3511 maxcount = svc_max_payload(resp->rqstp);
3512 maxcount = min_t(unsigned long, maxcount,
3513 (xdr->buf->buflen - xdr->buf->len));
3514 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3515
3516 if (read->rd_tmp_file)
3517 ra = nfsd_init_raparms(file);
3518
3519 if (file->f_op->splice_read &&
3520 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3521 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3522 else
3523 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3524
3525 if (ra)
3526 nfsd_put_raparams(file, ra);
3527
3528 if (nfserr)
3529 xdr_truncate_encode(xdr, starting_len);
3530
3531 out:
3532 if (file)
3533 fput(file);
3534 return nfserr;
3535 }
3536
3537 static __be32
3538 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3539 {
3540 int maxcount;
3541 __be32 wire_count;
3542 int zero = 0;
3543 struct xdr_stream *xdr = &resp->xdr;
3544 int length_offset = xdr->buf->len;
3545 __be32 *p;
3546
3547 if (nfserr)
3548 return nfserr;
3549
3550 p = xdr_reserve_space(xdr, 4);
3551 if (!p)
3552 return nfserr_resource;
3553 maxcount = PAGE_SIZE;
3554
3555 p = xdr_reserve_space(xdr, maxcount);
3556 if (!p)
3557 return nfserr_resource;
3558 /*
3559 * XXX: By default, the ->readlink() VFS op will truncate symlinks
3560 * if they would overflow the buffer. Is this kosher in NFSv4? If
3561 * not, one easy fix is: if ->readlink() precisely fills the buffer,
3562 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3563 */
3564 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3565 (char *)p, &maxcount);
3566 if (nfserr == nfserr_isdir)
3567 nfserr = nfserr_inval;
3568 if (nfserr) {
3569 xdr_truncate_encode(xdr, length_offset);
3570 return nfserr;
3571 }
3572
3573 wire_count = htonl(maxcount);
3574 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3575 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3576 if (maxcount & 3)
3577 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3578 &zero, 4 - (maxcount&3));
3579 return 0;
3580 }
3581
3582 static __be32
3583 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3584 {
3585 int maxcount;
3586 int bytes_left;
3587 loff_t offset;
3588 __be64 wire_offset;
3589 struct xdr_stream *xdr = &resp->xdr;
3590 int starting_len = xdr->buf->len;
3591 __be32 *p;
3592
3593 if (nfserr)
3594 return nfserr;
3595
3596 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3597 if (!p)
3598 return nfserr_resource;
3599
3600 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3601 *p++ = cpu_to_be32(0);
3602 *p++ = cpu_to_be32(0);
3603 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3604 - (char *)resp->xdr.buf->head[0].iov_base;
3605
3606 /*
3607 * Number of bytes left for directory entries allowing for the
3608 * final 8 bytes of the readdir and a following failed op:
3609 */
3610 bytes_left = xdr->buf->buflen - xdr->buf->len
3611 - COMPOUND_ERR_SLACK_SPACE - 8;
3612 if (bytes_left < 0) {
3613 nfserr = nfserr_resource;
3614 goto err_no_verf;
3615 }
3616 maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3617 /*
3618 * Note the rfc defines rd_maxcount as the size of the
3619 * READDIR4resok structure, which includes the verifier above
3620 * and the 8 bytes encoded at the end of this function:
3621 */
3622 if (maxcount < 16) {
3623 nfserr = nfserr_toosmall;
3624 goto err_no_verf;
3625 }
3626 maxcount = min_t(int, maxcount-16, bytes_left);
3627
3628 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3629 if (!readdir->rd_dircount)
3630 readdir->rd_dircount = INT_MAX;
3631
3632 readdir->xdr = xdr;
3633 readdir->rd_maxcount = maxcount;
3634 readdir->common.err = 0;
3635 readdir->cookie_offset = 0;
3636
3637 offset = readdir->rd_cookie;
3638 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3639 &offset,
3640 &readdir->common, nfsd4_encode_dirent);
3641 if (nfserr == nfs_ok &&
3642 readdir->common.err == nfserr_toosmall &&
3643 xdr->buf->len == starting_len + 8) {
3644 /* nothing encoded; which limit did we hit?: */
3645 if (maxcount - 16 < bytes_left)
3646 /* It was the fault of rd_maxcount: */
3647 nfserr = nfserr_toosmall;
3648 else
3649 /* We ran out of buffer space: */
3650 nfserr = nfserr_resource;
3651 }
3652 if (nfserr)
3653 goto err_no_verf;
3654
3655 if (readdir->cookie_offset) {
3656 wire_offset = cpu_to_be64(offset);
3657 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3658 &wire_offset, 8);
3659 }
3660
3661 p = xdr_reserve_space(xdr, 8);
3662 if (!p) {
3663 WARN_ON_ONCE(1);
3664 goto err_no_verf;
3665 }
3666 *p++ = 0; /* no more entries */
3667 *p++ = htonl(readdir->common.err == nfserr_eof);
3668
3669 return 0;
3670 err_no_verf:
3671 xdr_truncate_encode(xdr, starting_len);
3672 return nfserr;
3673 }
3674
3675 static __be32
3676 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3677 {
3678 struct xdr_stream *xdr = &resp->xdr;
3679 __be32 *p;
3680
3681 if (!nfserr) {
3682 p = xdr_reserve_space(xdr, 20);
3683 if (!p)
3684 return nfserr_resource;
3685 p = encode_cinfo(p, &remove->rm_cinfo);
3686 }
3687 return nfserr;
3688 }
3689
3690 static __be32
3691 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3692 {
3693 struct xdr_stream *xdr = &resp->xdr;
3694 __be32 *p;
3695
3696 if (!nfserr) {
3697 p = xdr_reserve_space(xdr, 40);
3698 if (!p)
3699 return nfserr_resource;
3700 p = encode_cinfo(p, &rename->rn_sinfo);
3701 p = encode_cinfo(p, &rename->rn_tinfo);
3702 }
3703 return nfserr;
3704 }
3705
3706 static __be32
3707 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3708 __be32 nfserr, struct svc_export *exp)
3709 {
3710 u32 i, nflavs, supported;
3711 struct exp_flavor_info *flavs;
3712 struct exp_flavor_info def_flavs[2];
3713 __be32 *p, *flavorsp;
3714 static bool report = true;
3715
3716 if (nfserr)
3717 goto out;
3718 nfserr = nfserr_resource;
3719 if (exp->ex_nflavors) {
3720 flavs = exp->ex_flavors;
3721 nflavs = exp->ex_nflavors;
3722 } else { /* Handling of some defaults in absence of real secinfo: */
3723 flavs = def_flavs;
3724 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3725 nflavs = 2;
3726 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3727 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3728 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3729 nflavs = 1;
3730 flavs[0].pseudoflavor
3731 = svcauth_gss_flavor(exp->ex_client);
3732 } else {
3733 nflavs = 1;
3734 flavs[0].pseudoflavor
3735 = exp->ex_client->flavour->flavour;
3736 }
3737 }
3738
3739 supported = 0;
3740 p = xdr_reserve_space(xdr, 4);
3741 if (!p)
3742 goto out;
3743 flavorsp = p++; /* to be backfilled later */
3744
3745 for (i = 0; i < nflavs; i++) {
3746 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3747 struct rpcsec_gss_info info;
3748
3749 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3750 supported++;
3751 p = xdr_reserve_space(xdr, 4 + 4 +
3752 XDR_LEN(info.oid.len) + 4 + 4);
3753 if (!p)
3754 goto out;
3755 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3756 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3757 *p++ = cpu_to_be32(info.qop);
3758 *p++ = cpu_to_be32(info.service);
3759 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3760 supported++;
3761 p = xdr_reserve_space(xdr, 4);
3762 if (!p)
3763 goto out;
3764 *p++ = cpu_to_be32(pf);
3765 } else {
3766 if (report)
3767 pr_warn("NFS: SECINFO: security flavor %u "
3768 "is not supported\n", pf);
3769 }
3770 }
3771
3772 if (nflavs != supported)
3773 report = false;
3774 *flavorsp = htonl(supported);
3775 nfserr = 0;
3776 out:
3777 if (exp)
3778 exp_put(exp);
3779 return nfserr;
3780 }
3781
3782 static __be32
3783 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3784 struct nfsd4_secinfo *secinfo)
3785 {
3786 struct xdr_stream *xdr = &resp->xdr;
3787
3788 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3789 }
3790
3791 static __be32
3792 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3793 struct nfsd4_secinfo_no_name *secinfo)
3794 {
3795 struct xdr_stream *xdr = &resp->xdr;
3796
3797 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3798 }
3799
3800 /*
3801 * The SETATTR encode routine is special -- it always encodes a bitmap,
3802 * regardless of the error status.
3803 */
3804 static __be32
3805 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3806 {
3807 struct xdr_stream *xdr = &resp->xdr;
3808 __be32 *p;
3809
3810 p = xdr_reserve_space(xdr, 16);
3811 if (!p)
3812 return nfserr_resource;
3813 if (nfserr) {
3814 *p++ = cpu_to_be32(3);
3815 *p++ = cpu_to_be32(0);
3816 *p++ = cpu_to_be32(0);
3817 *p++ = cpu_to_be32(0);
3818 }
3819 else {
3820 *p++ = cpu_to_be32(3);
3821 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3822 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3823 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3824 }
3825 return nfserr;
3826 }
3827
3828 static __be32
3829 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3830 {
3831 struct xdr_stream *xdr = &resp->xdr;
3832 __be32 *p;
3833
3834 if (!nfserr) {
3835 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3836 if (!p)
3837 return nfserr_resource;
3838 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3839 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3840 NFS4_VERIFIER_SIZE);
3841 }
3842 else if (nfserr == nfserr_clid_inuse) {
3843 p = xdr_reserve_space(xdr, 8);
3844 if (!p)
3845 return nfserr_resource;
3846 *p++ = cpu_to_be32(0);
3847 *p++ = cpu_to_be32(0);
3848 }
3849 return nfserr;
3850 }
3851
3852 static __be32
3853 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3854 {
3855 struct xdr_stream *xdr = &resp->xdr;
3856 __be32 *p;
3857
3858 if (!nfserr) {
3859 p = xdr_reserve_space(xdr, 16);
3860 if (!p)
3861 return nfserr_resource;
3862 *p++ = cpu_to_be32(write->wr_bytes_written);
3863 *p++ = cpu_to_be32(write->wr_how_written);
3864 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3865 NFS4_VERIFIER_SIZE);
3866 }
3867 return nfserr;
3868 }
3869
3870 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3871 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3872 1 << (OP_EXCHANGE_ID - 32) |
3873 1 << (OP_CREATE_SESSION - 32) |
3874 1 << (OP_DESTROY_SESSION - 32) |
3875 1 << (OP_DESTROY_CLIENTID - 32)
3876 };
3877
3878 static __be32
3879 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3880 struct nfsd4_exchange_id *exid)
3881 {
3882 struct xdr_stream *xdr = &resp->xdr;
3883 __be32 *p;
3884 char *major_id;
3885 char *server_scope;
3886 int major_id_sz;
3887 int server_scope_sz;
3888 uint64_t minor_id = 0;
3889
3890 if (nfserr)
3891 return nfserr;
3892
3893 major_id = utsname()->nodename;
3894 major_id_sz = strlen(major_id);
3895 server_scope = utsname()->nodename;
3896 server_scope_sz = strlen(server_scope);
3897
3898 p = xdr_reserve_space(xdr,
3899 8 /* eir_clientid */ +
3900 4 /* eir_sequenceid */ +
3901 4 /* eir_flags */ +
3902 4 /* spr_how */);
3903 if (!p)
3904 return nfserr_resource;
3905
3906 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3907 *p++ = cpu_to_be32(exid->seqid);
3908 *p++ = cpu_to_be32(exid->flags);
3909
3910 *p++ = cpu_to_be32(exid->spa_how);
3911
3912 switch (exid->spa_how) {
3913 case SP4_NONE:
3914 break;
3915 case SP4_MACH_CRED:
3916 /* spo_must_enforce, spo_must_allow */
3917 p = xdr_reserve_space(xdr, 16);
3918 if (!p)
3919 return nfserr_resource;
3920
3921 /* spo_must_enforce bitmap: */
3922 *p++ = cpu_to_be32(2);
3923 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3924 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3925 /* empty spo_must_allow bitmap: */
3926 *p++ = cpu_to_be32(0);
3927
3928 break;
3929 default:
3930 WARN_ON_ONCE(1);
3931 }
3932
3933 p = xdr_reserve_space(xdr,
3934 8 /* so_minor_id */ +
3935 4 /* so_major_id.len */ +
3936 (XDR_QUADLEN(major_id_sz) * 4) +
3937 4 /* eir_server_scope.len */ +
3938 (XDR_QUADLEN(server_scope_sz) * 4) +
3939 4 /* eir_server_impl_id.count (0) */);
3940 if (!p)
3941 return nfserr_resource;
3942
3943 /* The server_owner struct */
3944 p = xdr_encode_hyper(p, minor_id); /* Minor id */
3945 /* major id */
3946 p = xdr_encode_opaque(p, major_id, major_id_sz);
3947
3948 /* Server scope */
3949 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3950
3951 /* Implementation id */
3952 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
3953 return 0;
3954 }
3955
3956 static __be32
3957 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3958 struct nfsd4_create_session *sess)
3959 {
3960 struct xdr_stream *xdr = &resp->xdr;
3961 __be32 *p;
3962
3963 if (nfserr)
3964 return nfserr;
3965
3966 p = xdr_reserve_space(xdr, 24);
3967 if (!p)
3968 return nfserr_resource;
3969 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3970 NFS4_MAX_SESSIONID_LEN);
3971 *p++ = cpu_to_be32(sess->seqid);
3972 *p++ = cpu_to_be32(sess->flags);
3973
3974 p = xdr_reserve_space(xdr, 28);
3975 if (!p)
3976 return nfserr_resource;
3977 *p++ = cpu_to_be32(0); /* headerpadsz */
3978 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3979 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3980 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3981 *p++ = cpu_to_be32(sess->fore_channel.maxops);
3982 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3983 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3984
3985 if (sess->fore_channel.nr_rdma_attrs) {
3986 p = xdr_reserve_space(xdr, 4);
3987 if (!p)
3988 return nfserr_resource;
3989 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3990 }
3991
3992 p = xdr_reserve_space(xdr, 28);
3993 if (!p)
3994 return nfserr_resource;
3995 *p++ = cpu_to_be32(0); /* headerpadsz */
3996 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3997 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3998 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3999 *p++ = cpu_to_be32(sess->back_channel.maxops);
4000 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4001 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4002
4003 if (sess->back_channel.nr_rdma_attrs) {
4004 p = xdr_reserve_space(xdr, 4);
4005 if (!p)
4006 return nfserr_resource;
4007 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4008 }
4009 return 0;
4010 }
4011
4012 static __be32
4013 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4014 struct nfsd4_sequence *seq)
4015 {
4016 struct xdr_stream *xdr = &resp->xdr;
4017 __be32 *p;
4018
4019 if (nfserr)
4020 return nfserr;
4021
4022 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4023 if (!p)
4024 return nfserr_resource;
4025 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4026 NFS4_MAX_SESSIONID_LEN);
4027 *p++ = cpu_to_be32(seq->seqid);
4028 *p++ = cpu_to_be32(seq->slotid);
4029 /* Note slotid's are numbered from zero: */
4030 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4031 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4032 *p++ = cpu_to_be32(seq->status_flags);
4033
4034 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4035 return 0;
4036 }
4037
4038 static __be32
4039 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4040 struct nfsd4_test_stateid *test_stateid)
4041 {
4042 struct xdr_stream *xdr = &resp->xdr;
4043 struct nfsd4_test_stateid_id *stateid, *next;
4044 __be32 *p;
4045
4046 if (nfserr)
4047 return nfserr;
4048
4049 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4050 if (!p)
4051 return nfserr_resource;
4052 *p++ = htonl(test_stateid->ts_num_ids);
4053
4054 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4055 *p++ = stateid->ts_id_status;
4056 }
4057
4058 return nfserr;
4059 }
4060
4061 #ifdef CONFIG_NFSD_PNFS
4062 static __be32
4063 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4064 struct nfsd4_getdeviceinfo *gdev)
4065 {
4066 struct xdr_stream *xdr = &resp->xdr;
4067 const struct nfsd4_layout_ops *ops =
4068 nfsd4_layout_ops[gdev->gd_layout_type];
4069 u32 starting_len = xdr->buf->len, needed_len;
4070 __be32 *p;
4071
4072 dprintk("%s: err %d\n", __func__, nfserr);
4073 if (nfserr)
4074 goto out;
4075
4076 nfserr = nfserr_resource;
4077 p = xdr_reserve_space(xdr, 4);
4078 if (!p)
4079 goto out;
4080
4081 *p++ = cpu_to_be32(gdev->gd_layout_type);
4082
4083 /* If maxcount is 0 then just update notifications */
4084 if (gdev->gd_maxcount != 0) {
4085 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4086 if (nfserr) {
4087 /*
4088 * We don't bother to burden the layout drivers with
4089 * enforcing gd_maxcount, just tell the client to
4090 * come back with a bigger buffer if it's not enough.
4091 */
4092 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4093 goto toosmall;
4094 goto out;
4095 }
4096 }
4097
4098 nfserr = nfserr_resource;
4099 if (gdev->gd_notify_types) {
4100 p = xdr_reserve_space(xdr, 4 + 4);
4101 if (!p)
4102 goto out;
4103 *p++ = cpu_to_be32(1); /* bitmap length */
4104 *p++ = cpu_to_be32(gdev->gd_notify_types);
4105 } else {
4106 p = xdr_reserve_space(xdr, 4);
4107 if (!p)
4108 goto out;
4109 *p++ = 0;
4110 }
4111
4112 nfserr = 0;
4113 out:
4114 kfree(gdev->gd_device);
4115 dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4116 return nfserr;
4117
4118 toosmall:
4119 dprintk("%s: maxcount too small\n", __func__);
4120 needed_len = xdr->buf->len + 4 /* notifications */;
4121 xdr_truncate_encode(xdr, starting_len);
4122 p = xdr_reserve_space(xdr, 4);
4123 if (!p) {
4124 nfserr = nfserr_resource;
4125 } else {
4126 *p++ = cpu_to_be32(needed_len);
4127 nfserr = nfserr_toosmall;
4128 }
4129 goto out;
4130 }
4131
4132 static __be32
4133 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4134 struct nfsd4_layoutget *lgp)
4135 {
4136 struct xdr_stream *xdr = &resp->xdr;
4137 const struct nfsd4_layout_ops *ops =
4138 nfsd4_layout_ops[lgp->lg_layout_type];
4139 __be32 *p;
4140
4141 dprintk("%s: err %d\n", __func__, nfserr);
4142 if (nfserr)
4143 goto out;
4144
4145 nfserr = nfserr_resource;
4146 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4147 if (!p)
4148 goto out;
4149
4150 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4151 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4152 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4153 sizeof(stateid_opaque_t));
4154
4155 *p++ = cpu_to_be32(1); /* we always return a single layout */
4156 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4157 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4158 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4159 *p++ = cpu_to_be32(lgp->lg_layout_type);
4160
4161 nfserr = ops->encode_layoutget(xdr, lgp);
4162 out:
4163 kfree(lgp->lg_content);
4164 return nfserr;
4165 }
4166
4167 static __be32
4168 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4169 struct nfsd4_layoutcommit *lcp)
4170 {
4171 struct xdr_stream *xdr = &resp->xdr;
4172 __be32 *p;
4173
4174 if (nfserr)
4175 return nfserr;
4176
4177 p = xdr_reserve_space(xdr, 4);
4178 if (!p)
4179 return nfserr_resource;
4180 *p++ = cpu_to_be32(lcp->lc_size_chg);
4181 if (lcp->lc_size_chg) {
4182 p = xdr_reserve_space(xdr, 8);
4183 if (!p)
4184 return nfserr_resource;
4185 p = xdr_encode_hyper(p, lcp->lc_newsize);
4186 }
4187
4188 return nfs_ok;
4189 }
4190
4191 static __be32
4192 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4193 struct nfsd4_layoutreturn *lrp)
4194 {
4195 struct xdr_stream *xdr = &resp->xdr;
4196 __be32 *p;
4197
4198 if (nfserr)
4199 return nfserr;
4200
4201 p = xdr_reserve_space(xdr, 4);
4202 if (!p)
4203 return nfserr_resource;
4204 *p++ = cpu_to_be32(lrp->lrs_present);
4205 if (lrp->lrs_present)
4206 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4207 return nfs_ok;
4208 }
4209 #endif /* CONFIG_NFSD_PNFS */
4210
4211 static __be32
4212 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4213 struct nfsd4_seek *seek)
4214 {
4215 __be32 *p;
4216
4217 if (nfserr)
4218 return nfserr;
4219
4220 p = xdr_reserve_space(&resp->xdr, 4 + 8);
4221 *p++ = cpu_to_be32(seek->seek_eof);
4222 p = xdr_encode_hyper(p, seek->seek_pos);
4223
4224 return nfserr;
4225 }
4226
4227 static __be32
4228 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4229 {
4230 return nfserr;
4231 }
4232
4233 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4234
4235 /*
4236 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4237 * since we don't need to filter out obsolete ops as this is
4238 * done in the decoding phase.
4239 */
4240 static nfsd4_enc nfsd4_enc_ops[] = {
4241 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
4242 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
4243 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
4244 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
4245 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
4246 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4247 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
4248 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
4249 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
4250 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
4251 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
4252 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
4253 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
4254 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
4255 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4256 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
4257 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
4258 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
4259 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
4260 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
4261 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
4262 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
4263 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
4264 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
4265 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
4266 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
4267 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
4268 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
4269 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
4270 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
4271 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
4272 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
4273 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
4274 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4275 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4276 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
4277 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
4278
4279 /* NFSv4.1 operations */
4280 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
4281 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4282 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
4283 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
4284 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
4285 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
4286 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4287 #ifdef CONFIG_NFSD_PNFS
4288 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4289 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4290 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit,
4291 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget,
4292 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn,
4293 #else
4294 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
4295 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4296 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
4297 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
4298 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4299 #endif
4300 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4301 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
4302 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
4303 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
4304 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4305 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
4306 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
4307
4308 /* NFSv4.2 operations */
4309 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4310 [OP_COPY] = (nfsd4_enc)nfsd4_encode_noop,
4311 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
4312 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4313 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
4314 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
4315 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
4316 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
4317 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop,
4318 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
4319 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
4320 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
4321 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop,
4322 };
4323
4324 /*
4325 * Calculate whether we still have space to encode repsize bytes.
4326 * There are two considerations:
4327 * - For NFS versions >=4.1, the size of the reply must stay within
4328 * session limits
4329 * - For all NFS versions, we must stay within limited preallocated
4330 * buffer space.
4331 *
4332 * This is called before the operation is processed, so can only provide
4333 * an upper estimate. For some nonidempotent operations (such as
4334 * getattr), it's not necessarily a problem if that estimate is wrong,
4335 * as we can fail it after processing without significant side effects.
4336 */
4337 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4338 {
4339 struct xdr_buf *buf = &resp->rqstp->rq_res;
4340 struct nfsd4_slot *slot = resp->cstate.slot;
4341
4342 if (buf->len + respsize <= buf->buflen)
4343 return nfs_ok;
4344 if (!nfsd4_has_session(&resp->cstate))
4345 return nfserr_resource;
4346 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4347 WARN_ON_ONCE(1);
4348 return nfserr_rep_too_big_to_cache;
4349 }
4350 return nfserr_rep_too_big;
4351 }
4352
4353 void
4354 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4355 {
4356 struct xdr_stream *xdr = &resp->xdr;
4357 struct nfs4_stateowner *so = resp->cstate.replay_owner;
4358 struct svc_rqst *rqstp = resp->rqstp;
4359 int post_err_offset;
4360 nfsd4_enc encoder;
4361 __be32 *p;
4362
4363 p = xdr_reserve_space(xdr, 8);
4364 if (!p) {
4365 WARN_ON_ONCE(1);
4366 return;
4367 }
4368 *p++ = cpu_to_be32(op->opnum);
4369 post_err_offset = xdr->buf->len;
4370
4371 if (op->opnum == OP_ILLEGAL)
4372 goto status;
4373 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4374 !nfsd4_enc_ops[op->opnum]);
4375 encoder = nfsd4_enc_ops[op->opnum];
4376 op->status = encoder(resp, op->status, &op->u);
4377 xdr_commit_encode(xdr);
4378
4379 /* nfsd4_check_resp_size guarantees enough room for error status */
4380 if (!op->status) {
4381 int space_needed = 0;
4382 if (!nfsd4_last_compound_op(rqstp))
4383 space_needed = COMPOUND_ERR_SLACK_SPACE;
4384 op->status = nfsd4_check_resp_size(resp, space_needed);
4385 }
4386 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4387 struct nfsd4_slot *slot = resp->cstate.slot;
4388
4389 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4390 op->status = nfserr_rep_too_big_to_cache;
4391 else
4392 op->status = nfserr_rep_too_big;
4393 }
4394 if (op->status == nfserr_resource ||
4395 op->status == nfserr_rep_too_big ||
4396 op->status == nfserr_rep_too_big_to_cache) {
4397 /*
4398 * The operation may have already been encoded or
4399 * partially encoded. No op returns anything additional
4400 * in the case of one of these three errors, so we can
4401 * just truncate back to after the status. But it's a
4402 * bug if we had to do this on a non-idempotent op:
4403 */
4404 warn_on_nonidempotent_op(op);
4405 xdr_truncate_encode(xdr, post_err_offset);
4406 }
4407 if (so) {
4408 int len = xdr->buf->len - post_err_offset;
4409
4410 so->so_replay.rp_status = op->status;
4411 so->so_replay.rp_buflen = len;
4412 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4413 so->so_replay.rp_buf, len);
4414 }
4415 status:
4416 /* Note that op->status is already in network byte order: */
4417 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4418 }
4419
4420 /*
4421 * Encode the reply stored in the stateowner reply cache
4422 *
4423 * XDR note: do not encode rp->rp_buflen: the buffer contains the
4424 * previously sent already encoded operation.
4425 */
4426 void
4427 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4428 {
4429 __be32 *p;
4430 struct nfs4_replay *rp = op->replay;
4431
4432 BUG_ON(!rp);
4433
4434 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4435 if (!p) {
4436 WARN_ON_ONCE(1);
4437 return;
4438 }
4439 *p++ = cpu_to_be32(op->opnum);
4440 *p++ = rp->rp_status; /* already xdr'ed */
4441
4442 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4443 }
4444
4445 int
4446 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4447 {
4448 return xdr_ressize_check(rqstp, p);
4449 }
4450
4451 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4452 {
4453 struct svc_rqst *rqstp = rq;
4454 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4455
4456 if (args->ops != args->iops) {
4457 kfree(args->ops);
4458 args->ops = args->iops;
4459 }
4460 kfree(args->tmpp);
4461 args->tmpp = NULL;
4462 while (args->to_free) {
4463 struct svcxdr_tmpbuf *tb = args->to_free;
4464 args->to_free = tb->next;
4465 kfree(tb);
4466 }
4467 return 1;
4468 }
4469
4470 int
4471 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4472 {
4473 if (rqstp->rq_arg.head[0].iov_len % 4) {
4474 /* client is nuts */
4475 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4476 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4477 return 0;
4478 }
4479 args->p = p;
4480 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4481 args->pagelist = rqstp->rq_arg.pages;
4482 args->pagelen = rqstp->rq_arg.page_len;
4483 args->tmpp = NULL;
4484 args->to_free = NULL;
4485 args->ops = args->iops;
4486 args->rqstp = rqstp;
4487
4488 return !nfsd4_decode_compound(args);
4489 }
4490
4491 int
4492 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4493 {
4494 /*
4495 * All that remains is to write the tag and operation count...
4496 */
4497 struct xdr_buf *buf = resp->xdr.buf;
4498
4499 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4500 buf->tail[0].iov_len);
4501
4502 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4503
4504 p = resp->tagp;
4505 *p++ = htonl(resp->taglen);
4506 memcpy(p, resp->tag, resp->taglen);
4507 p += XDR_QUADLEN(resp->taglen);
4508 *p++ = htonl(resp->opcnt);
4509
4510 nfsd4_sequence_done(resp);
4511 return 1;
4512 }
4513
4514 /*
4515 * Local variables:
4516 * c-basic-offset: 8
4517 * End:
4518 */
Linux with added FPC-III support