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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / fs / nfsd / nfs4xdr.c
blobe502fd16246b8130d17e3f3eef72d8e0879e4596
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/fs_struct.h>
37 #include <linux/file.h>
38 #include <linux/slab.h>
39 #include <linux/namei.h>
40 #include <linux/statfs.h>
41 #include <linux/utsname.h>
42 #include <linux/pagemap.h>
43 #include <linux/sunrpc/svcauth_gss.h>
44
45 #include "idmap.h"
46 #include "acl.h"
47 #include "xdr4.h"
48 #include "vfs.h"
49 #include "state.h"
50 #include "cache.h"
51 #include "netns.h"
52 #include "pnfs.h"
53
54 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
55 #include <linux/security.h>
56 #endif
57
58
59 #define NFSDDBG_FACILITY NFSDDBG_XDR
60
61 const u32 nfsd_suppattrs[3][3] = {
62 {NFSD4_SUPPORTED_ATTRS_WORD0,
63 NFSD4_SUPPORTED_ATTRS_WORD1,
64 NFSD4_SUPPORTED_ATTRS_WORD2},
65
66 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
67 NFSD4_1_SUPPORTED_ATTRS_WORD1,
68 NFSD4_1_SUPPORTED_ATTRS_WORD2},
69
70 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
71 NFSD4_1_SUPPORTED_ATTRS_WORD1,
72 NFSD4_2_SUPPORTED_ATTRS_WORD2},
73 };
74
75 /*
76 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
77 * directory in order to indicate to the client that a filesystem boundary is present
78 * We use a fixed fsid for a referral
79 */
80 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
81 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
82
83 static __be32
84 check_filename(char *str, int len)
85 {
86 int i;
87
88 if (len == 0)
89 return nfserr_inval;
90 if (isdotent(str, len))
91 return nfserr_badname;
92 for (i = 0; i < len; i++)
93 if (str[i] == '/')
94 return nfserr_badname;
95 return 0;
96 }
97
98 #define DECODE_HEAD \
99 __be32 *p; \
100 __be32 status
101 #define DECODE_TAIL \
102 status = 0; \
103 out: \
104 return status; \
105 xdr_error: \
106 dprintk("NFSD: xdr error (%s:%d)\n", \
107 __FILE__, __LINE__); \
108 status = nfserr_bad_xdr; \
109 goto out
110
111 #define READMEM(x,nbytes) do { \
112 x = (char *)p; \
113 p += XDR_QUADLEN(nbytes); \
114 } while (0)
115 #define SAVEMEM(x,nbytes) do { \
116 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
117 savemem(argp, p, nbytes) : \
118 (char *)p)) { \
119 dprintk("NFSD: xdr error (%s:%d)\n", \
120 __FILE__, __LINE__); \
121 goto xdr_error; \
122 } \
123 p += XDR_QUADLEN(nbytes); \
124 } while (0)
125 #define COPYMEM(x,nbytes) do { \
126 memcpy((x), p, nbytes); \
127 p += XDR_QUADLEN(nbytes); \
128 } while (0)
129
130 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
131 #define READ_BUF(nbytes) do { \
132 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
133 p = argp->p; \
134 argp->p += XDR_QUADLEN(nbytes); \
135 } else if (!(p = read_buf(argp, nbytes))) { \
136 dprintk("NFSD: xdr error (%s:%d)\n", \
137 __FILE__, __LINE__); \
138 goto xdr_error; \
139 } \
140 } while (0)
141
142 static void next_decode_page(struct nfsd4_compoundargs *argp)
143 {
144 argp->p = page_address(argp->pagelist[0]);
145 argp->pagelist++;
146 if (argp->pagelen < PAGE_SIZE) {
147 argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
148 argp->pagelen = 0;
149 } else {
150 argp->end = argp->p + (PAGE_SIZE>>2);
151 argp->pagelen -= PAGE_SIZE;
152 }
153 }
154
155 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
156 {
157 /* We want more bytes than seem to be available.
158 * Maybe we need a new page, maybe we have just run out
159 */
160 unsigned int avail = (char *)argp->end - (char *)argp->p;
161 __be32 *p;
162
163 if (argp->pagelen == 0) {
164 struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
165
166 if (!argp->tail) {
167 argp->tail = true;
168 avail = vec->iov_len;
169 argp->p = vec->iov_base;
170 argp->end = vec->iov_base + avail;
171 }
172
173 if (avail < nbytes)
174 return NULL;
175
176 p = argp->p;
177 argp->p += XDR_QUADLEN(nbytes);
178 return p;
179 }
180
181 if (avail + argp->pagelen < nbytes)
182 return NULL;
183 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
184 return NULL;
185 /* ok, we can do it with the current plus the next page */
186 if (nbytes <= sizeof(argp->tmp))
187 p = argp->tmp;
188 else {
189 kfree(argp->tmpp);
190 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
191 if (!p)
192 return NULL;
193
194 }
195 /*
196 * The following memcpy is safe because read_buf is always
197 * called with nbytes > avail, and the two cases above both
198 * guarantee p points to at least nbytes bytes.
199 */
200 memcpy(p, argp->p, avail);
201 next_decode_page(argp);
202 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
203 argp->p += XDR_QUADLEN(nbytes - avail);
204 return p;
205 }
206
207 static int zero_clientid(clientid_t *clid)
208 {
209 return (clid->cl_boot == 0) && (clid->cl_id == 0);
210 }
211
212 /**
213 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
214 * @argp: NFSv4 compound argument structure
215 * @p: pointer to be freed (with kfree())
216 *
217 * Marks @p to be freed when processing the compound operation
218 * described in @argp finishes.
219 */
220 static void *
221 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
222 {
223 struct svcxdr_tmpbuf *tb;
224
225 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
226 if (!tb)
227 return NULL;
228 tb->next = argp->to_free;
229 argp->to_free = tb;
230 return tb->buf;
231 }
232
233 /*
234 * For xdr strings that need to be passed to other kernel api's
235 * as null-terminated strings.
236 *
237 * Note null-terminating in place usually isn't safe since the
238 * buffer might end on a page boundary.
239 */
240 static char *
241 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
242 {
243 char *p = svcxdr_tmpalloc(argp, len + 1);
244
245 if (!p)
246 return NULL;
247 memcpy(p, buf, len);
248 p[len] = '\0';
249 return p;
250 }
251
252 /**
253 * savemem - duplicate a chunk of memory for later processing
254 * @argp: NFSv4 compound argument structure to be freed with
255 * @p: pointer to be duplicated
256 * @nbytes: length to be duplicated
257 *
258 * Returns a pointer to a copy of @nbytes bytes of memory at @p
259 * that are preserved until processing of the NFSv4 compound
260 * operation described by @argp finishes.
261 */
262 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
263 {
264 void *ret;
265
266 ret = svcxdr_tmpalloc(argp, nbytes);
267 if (!ret)
268 return NULL;
269 memcpy(ret, p, nbytes);
270 return ret;
271 }
272
273 /*
274 * We require the high 32 bits of 'seconds' to be 0, and
275 * we ignore all 32 bits of 'nseconds'.
276 */
277 static __be32
278 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
279 {
280 DECODE_HEAD;
281 u64 sec;
282
283 READ_BUF(12);
284 p = xdr_decode_hyper(p, &sec);
285 tv->tv_sec = sec;
286 tv->tv_nsec = be32_to_cpup(p++);
287 if (tv->tv_nsec >= (u32)1000000000)
288 return nfserr_inval;
289
290 DECODE_TAIL;
291 }
292
293 static __be32
294 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
295 {
296 u32 bmlen;
297 DECODE_HEAD;
298
299 bmval[0] = 0;
300 bmval[1] = 0;
301 bmval[2] = 0;
302
303 READ_BUF(4);
304 bmlen = be32_to_cpup(p++);
305 if (bmlen > 1000)
306 goto xdr_error;
307
308 READ_BUF(bmlen << 2);
309 if (bmlen > 0)
310 bmval[0] = be32_to_cpup(p++);
311 if (bmlen > 1)
312 bmval[1] = be32_to_cpup(p++);
313 if (bmlen > 2)
314 bmval[2] = be32_to_cpup(p++);
315
316 DECODE_TAIL;
317 }
318
319 static __be32
320 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
321 struct iattr *iattr, struct nfs4_acl **acl,
322 struct xdr_netobj *label, int *umask)
323 {
324 int expected_len, len = 0;
325 u32 dummy32;
326 char *buf;
327
328 DECODE_HEAD;
329 iattr->ia_valid = 0;
330 if ((status = nfsd4_decode_bitmap(argp, bmval)))
331 return status;
332
333 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
334 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
335 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
336 if (nfsd_attrs_supported(argp->minorversion, bmval))
337 return nfserr_inval;
338 return nfserr_attrnotsupp;
339 }
340
341 READ_BUF(4);
342 expected_len = be32_to_cpup(p++);
343
344 if (bmval[0] & FATTR4_WORD0_SIZE) {
345 READ_BUF(8);
346 len += 8;
347 p = xdr_decode_hyper(p, &iattr->ia_size);
348 iattr->ia_valid |= ATTR_SIZE;
349 }
350 if (bmval[0] & FATTR4_WORD0_ACL) {
351 u32 nace;
352 struct nfs4_ace *ace;
353
354 READ_BUF(4); len += 4;
355 nace = be32_to_cpup(p++);
356
357 if (nace > NFS4_ACL_MAX)
358 return nfserr_fbig;
359
360 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
361 if (*acl == NULL)
362 return nfserr_jukebox;
363
364 (*acl)->naces = nace;
365 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
366 READ_BUF(16); len += 16;
367 ace->type = be32_to_cpup(p++);
368 ace->flag = be32_to_cpup(p++);
369 ace->access_mask = be32_to_cpup(p++);
370 dummy32 = be32_to_cpup(p++);
371 READ_BUF(dummy32);
372 len += XDR_QUADLEN(dummy32) << 2;
373 READMEM(buf, dummy32);
374 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
375 status = nfs_ok;
376 if (ace->whotype != NFS4_ACL_WHO_NAMED)
377 ;
378 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
379 status = nfsd_map_name_to_gid(argp->rqstp,
380 buf, dummy32, &ace->who_gid);
381 else
382 status = nfsd_map_name_to_uid(argp->rqstp,
383 buf, dummy32, &ace->who_uid);
384 if (status)
385 return status;
386 }
387 } else
388 *acl = NULL;
389 if (bmval[1] & FATTR4_WORD1_MODE) {
390 READ_BUF(4);
391 len += 4;
392 iattr->ia_mode = be32_to_cpup(p++);
393 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
394 iattr->ia_valid |= ATTR_MODE;
395 }
396 if (bmval[1] & FATTR4_WORD1_OWNER) {
397 READ_BUF(4);
398 len += 4;
399 dummy32 = be32_to_cpup(p++);
400 READ_BUF(dummy32);
401 len += (XDR_QUADLEN(dummy32) << 2);
402 READMEM(buf, dummy32);
403 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
404 return status;
405 iattr->ia_valid |= ATTR_UID;
406 }
407 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
408 READ_BUF(4);
409 len += 4;
410 dummy32 = be32_to_cpup(p++);
411 READ_BUF(dummy32);
412 len += (XDR_QUADLEN(dummy32) << 2);
413 READMEM(buf, dummy32);
414 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
415 return status;
416 iattr->ia_valid |= ATTR_GID;
417 }
418 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
419 READ_BUF(4);
420 len += 4;
421 dummy32 = be32_to_cpup(p++);
422 switch (dummy32) {
423 case NFS4_SET_TO_CLIENT_TIME:
424 len += 12;
425 status = nfsd4_decode_time(argp, &iattr->ia_atime);
426 if (status)
427 return status;
428 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
429 break;
430 case NFS4_SET_TO_SERVER_TIME:
431 iattr->ia_valid |= ATTR_ATIME;
432 break;
433 default:
434 goto xdr_error;
435 }
436 }
437 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
438 READ_BUF(4);
439 len += 4;
440 dummy32 = be32_to_cpup(p++);
441 switch (dummy32) {
442 case NFS4_SET_TO_CLIENT_TIME:
443 len += 12;
444 status = nfsd4_decode_time(argp, &iattr->ia_mtime);
445 if (status)
446 return status;
447 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
448 break;
449 case NFS4_SET_TO_SERVER_TIME:
450 iattr->ia_valid |= ATTR_MTIME;
451 break;
452 default:
453 goto xdr_error;
454 }
455 }
456
457 label->len = 0;
458 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
459 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
460 READ_BUF(4);
461 len += 4;
462 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
463 READ_BUF(4);
464 len += 4;
465 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
466 READ_BUF(4);
467 len += 4;
468 dummy32 = be32_to_cpup(p++);
469 READ_BUF(dummy32);
470 if (dummy32 > NFS4_MAXLABELLEN)
471 return nfserr_badlabel;
472 len += (XDR_QUADLEN(dummy32) << 2);
473 READMEM(buf, dummy32);
474 label->len = dummy32;
475 label->data = svcxdr_dupstr(argp, buf, dummy32);
476 if (!label->data)
477 return nfserr_jukebox;
478 }
479 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
480 if (!umask)
481 goto xdr_error;
482 READ_BUF(8);
483 len += 8;
484 dummy32 = be32_to_cpup(p++);
485 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
486 dummy32 = be32_to_cpup(p++);
487 *umask = dummy32 & S_IRWXUGO;
488 iattr->ia_valid |= ATTR_MODE;
489 }
490 if (len != expected_len)
491 goto xdr_error;
492
493 DECODE_TAIL;
494 }
495
496 static __be32
497 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
498 {
499 DECODE_HEAD;
500
501 READ_BUF(sizeof(stateid_t));
502 sid->si_generation = be32_to_cpup(p++);
503 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
504
505 DECODE_TAIL;
506 }
507
508 static __be32
509 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
510 {
511 DECODE_HEAD;
512
513 READ_BUF(4);
514 access->ac_req_access = be32_to_cpup(p++);
515
516 DECODE_TAIL;
517 }
518
519 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
520 {
521 DECODE_HEAD;
522 u32 dummy, uid, gid;
523 char *machine_name;
524 int i;
525 int nr_secflavs;
526
527 /* callback_sec_params4 */
528 READ_BUF(4);
529 nr_secflavs = be32_to_cpup(p++);
530 if (nr_secflavs)
531 cbs->flavor = (u32)(-1);
532 else
533 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
534 cbs->flavor = 0;
535 for (i = 0; i < nr_secflavs; ++i) {
536 READ_BUF(4);
537 dummy = be32_to_cpup(p++);
538 switch (dummy) {
539 case RPC_AUTH_NULL:
540 /* Nothing to read */
541 if (cbs->flavor == (u32)(-1))
542 cbs->flavor = RPC_AUTH_NULL;
543 break;
544 case RPC_AUTH_UNIX:
545 READ_BUF(8);
546 /* stamp */
547 dummy = be32_to_cpup(p++);
548
549 /* machine name */
550 dummy = be32_to_cpup(p++);
551 READ_BUF(dummy);
552 SAVEMEM(machine_name, dummy);
553
554 /* uid, gid */
555 READ_BUF(8);
556 uid = be32_to_cpup(p++);
557 gid = be32_to_cpup(p++);
558
559 /* more gids */
560 READ_BUF(4);
561 dummy = be32_to_cpup(p++);
562 READ_BUF(dummy * 4);
563 if (cbs->flavor == (u32)(-1)) {
564 kuid_t kuid = make_kuid(&init_user_ns, uid);
565 kgid_t kgid = make_kgid(&init_user_ns, gid);
566 if (uid_valid(kuid) && gid_valid(kgid)) {
567 cbs->uid = kuid;
568 cbs->gid = kgid;
569 cbs->flavor = RPC_AUTH_UNIX;
570 } else {
571 dprintk("RPC_AUTH_UNIX with invalid"
572 "uid or gid ignoring!\n");
573 }
574 }
575 break;
576 case RPC_AUTH_GSS:
577 dprintk("RPC_AUTH_GSS callback secflavor "
578 "not supported!\n");
579 READ_BUF(8);
580 /* gcbp_service */
581 dummy = be32_to_cpup(p++);
582 /* gcbp_handle_from_server */
583 dummy = be32_to_cpup(p++);
584 READ_BUF(dummy);
585 p += XDR_QUADLEN(dummy);
586 /* gcbp_handle_from_client */
587 READ_BUF(4);
588 dummy = be32_to_cpup(p++);
589 READ_BUF(dummy);
590 break;
591 default:
592 dprintk("Illegal callback secflavor\n");
593 return nfserr_inval;
594 }
595 }
596 DECODE_TAIL;
597 }
598
599 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
600 {
601 DECODE_HEAD;
602
603 READ_BUF(4);
604 bc->bc_cb_program = be32_to_cpup(p++);
605 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
606
607 DECODE_TAIL;
608 }
609
610 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
611 {
612 DECODE_HEAD;
613
614 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
615 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
616 bcts->dir = be32_to_cpup(p++);
617 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
618 * could help us figure out we should be using it. */
619 DECODE_TAIL;
620 }
621
622 static __be32
623 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
624 {
625 DECODE_HEAD;
626
627 READ_BUF(4);
628 close->cl_seqid = be32_to_cpup(p++);
629 return nfsd4_decode_stateid(argp, &close->cl_stateid);
630
631 DECODE_TAIL;
632 }
633
634
635 static __be32
636 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
637 {
638 DECODE_HEAD;
639
640 READ_BUF(12);
641 p = xdr_decode_hyper(p, &commit->co_offset);
642 commit->co_count = be32_to_cpup(p++);
643
644 DECODE_TAIL;
645 }
646
647 static __be32
648 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
649 {
650 DECODE_HEAD;
651
652 READ_BUF(4);
653 create->cr_type = be32_to_cpup(p++);
654 switch (create->cr_type) {
655 case NF4LNK:
656 READ_BUF(4);
657 create->cr_datalen = be32_to_cpup(p++);
658 READ_BUF(create->cr_datalen);
659 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
660 if (!create->cr_data)
661 return nfserr_jukebox;
662 break;
663 case NF4BLK:
664 case NF4CHR:
665 READ_BUF(8);
666 create->cr_specdata1 = be32_to_cpup(p++);
667 create->cr_specdata2 = be32_to_cpup(p++);
668 break;
669 case NF4SOCK:
670 case NF4FIFO:
671 case NF4DIR:
672 default:
673 break;
674 }
675
676 READ_BUF(4);
677 create->cr_namelen = be32_to_cpup(p++);
678 READ_BUF(create->cr_namelen);
679 SAVEMEM(create->cr_name, create->cr_namelen);
680 if ((status = check_filename(create->cr_name, create->cr_namelen)))
681 return status;
682
683 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
684 &create->cr_acl, &create->cr_label,
685 &current->fs->umask);
686 if (status)
687 goto out;
688
689 DECODE_TAIL;
690 }
691
692 static inline __be32
693 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
694 {
695 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
696 }
697
698 static inline __be32
699 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
700 {
701 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
702 }
703
704 static __be32
705 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
706 {
707 DECODE_HEAD;
708
709 READ_BUF(4);
710 link->li_namelen = be32_to_cpup(p++);
711 READ_BUF(link->li_namelen);
712 SAVEMEM(link->li_name, link->li_namelen);
713 if ((status = check_filename(link->li_name, link->li_namelen)))
714 return status;
715
716 DECODE_TAIL;
717 }
718
719 static __be32
720 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
721 {
722 DECODE_HEAD;
723
724 /*
725 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
726 */
727 READ_BUF(28);
728 lock->lk_type = be32_to_cpup(p++);
729 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
730 goto xdr_error;
731 lock->lk_reclaim = be32_to_cpup(p++);
732 p = xdr_decode_hyper(p, &lock->lk_offset);
733 p = xdr_decode_hyper(p, &lock->lk_length);
734 lock->lk_is_new = be32_to_cpup(p++);
735
736 if (lock->lk_is_new) {
737 READ_BUF(4);
738 lock->lk_new_open_seqid = be32_to_cpup(p++);
739 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
740 if (status)
741 return status;
742 READ_BUF(8 + sizeof(clientid_t));
743 lock->lk_new_lock_seqid = be32_to_cpup(p++);
744 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
745 lock->lk_new_owner.len = be32_to_cpup(p++);
746 READ_BUF(lock->lk_new_owner.len);
747 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
748 } else {
749 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
750 if (status)
751 return status;
752 READ_BUF(4);
753 lock->lk_old_lock_seqid = be32_to_cpup(p++);
754 }
755
756 DECODE_TAIL;
757 }
758
759 static __be32
760 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
761 {
762 DECODE_HEAD;
763
764 READ_BUF(32);
765 lockt->lt_type = be32_to_cpup(p++);
766 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
767 goto xdr_error;
768 p = xdr_decode_hyper(p, &lockt->lt_offset);
769 p = xdr_decode_hyper(p, &lockt->lt_length);
770 COPYMEM(&lockt->lt_clientid, 8);
771 lockt->lt_owner.len = be32_to_cpup(p++);
772 READ_BUF(lockt->lt_owner.len);
773 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
774
775 DECODE_TAIL;
776 }
777
778 static __be32
779 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
780 {
781 DECODE_HEAD;
782
783 READ_BUF(8);
784 locku->lu_type = be32_to_cpup(p++);
785 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
786 goto xdr_error;
787 locku->lu_seqid = be32_to_cpup(p++);
788 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
789 if (status)
790 return status;
791 READ_BUF(16);
792 p = xdr_decode_hyper(p, &locku->lu_offset);
793 p = xdr_decode_hyper(p, &locku->lu_length);
794
795 DECODE_TAIL;
796 }
797
798 static __be32
799 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
800 {
801 DECODE_HEAD;
802
803 READ_BUF(4);
804 lookup->lo_len = be32_to_cpup(p++);
805 READ_BUF(lookup->lo_len);
806 SAVEMEM(lookup->lo_name, lookup->lo_len);
807 if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
808 return status;
809
810 DECODE_TAIL;
811 }
812
813 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
814 {
815 __be32 *p;
816 u32 w;
817
818 READ_BUF(4);
819 w = be32_to_cpup(p++);
820 *share_access = w & NFS4_SHARE_ACCESS_MASK;
821 *deleg_want = w & NFS4_SHARE_WANT_MASK;
822 if (deleg_when)
823 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
824
825 switch (w & NFS4_SHARE_ACCESS_MASK) {
826 case NFS4_SHARE_ACCESS_READ:
827 case NFS4_SHARE_ACCESS_WRITE:
828 case NFS4_SHARE_ACCESS_BOTH:
829 break;
830 default:
831 return nfserr_bad_xdr;
832 }
833 w &= ~NFS4_SHARE_ACCESS_MASK;
834 if (!w)
835 return nfs_ok;
836 if (!argp->minorversion)
837 return nfserr_bad_xdr;
838 switch (w & NFS4_SHARE_WANT_MASK) {
839 case NFS4_SHARE_WANT_NO_PREFERENCE:
840 case NFS4_SHARE_WANT_READ_DELEG:
841 case NFS4_SHARE_WANT_WRITE_DELEG:
842 case NFS4_SHARE_WANT_ANY_DELEG:
843 case NFS4_SHARE_WANT_NO_DELEG:
844 case NFS4_SHARE_WANT_CANCEL:
845 break;
846 default:
847 return nfserr_bad_xdr;
848 }
849 w &= ~NFS4_SHARE_WANT_MASK;
850 if (!w)
851 return nfs_ok;
852
853 if (!deleg_when) /* open_downgrade */
854 return nfserr_inval;
855 switch (w) {
856 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
857 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
858 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
859 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
860 return nfs_ok;
861 }
862 xdr_error:
863 return nfserr_bad_xdr;
864 }
865
866 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
867 {
868 __be32 *p;
869
870 READ_BUF(4);
871 *x = be32_to_cpup(p++);
872 /* Note: unlinke access bits, deny bits may be zero. */
873 if (*x & ~NFS4_SHARE_DENY_BOTH)
874 return nfserr_bad_xdr;
875 return nfs_ok;
876 xdr_error:
877 return nfserr_bad_xdr;
878 }
879
880 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
881 {
882 __be32 *p;
883
884 READ_BUF(4);
885 o->len = be32_to_cpup(p++);
886
887 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
888 return nfserr_bad_xdr;
889
890 READ_BUF(o->len);
891 SAVEMEM(o->data, o->len);
892 return nfs_ok;
893 xdr_error:
894 return nfserr_bad_xdr;
895 }
896
897 static __be32
898 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
899 {
900 DECODE_HEAD;
901 u32 dummy;
902
903 memset(open->op_bmval, 0, sizeof(open->op_bmval));
904 open->op_iattr.ia_valid = 0;
905 open->op_openowner = NULL;
906
907 open->op_xdr_error = 0;
908 /* seqid, share_access, share_deny, clientid, ownerlen */
909 READ_BUF(4);
910 open->op_seqid = be32_to_cpup(p++);
911 /* decode, yet ignore deleg_when until supported */
912 status = nfsd4_decode_share_access(argp, &open->op_share_access,
913 &open->op_deleg_want, &dummy);
914 if (status)
915 goto xdr_error;
916 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
917 if (status)
918 goto xdr_error;
919 READ_BUF(sizeof(clientid_t));
920 COPYMEM(&open->op_clientid, sizeof(clientid_t));
921 status = nfsd4_decode_opaque(argp, &open->op_owner);
922 if (status)
923 goto xdr_error;
924 READ_BUF(4);
925 open->op_create = be32_to_cpup(p++);
926 switch (open->op_create) {
927 case NFS4_OPEN_NOCREATE:
928 break;
929 case NFS4_OPEN_CREATE:
930 current->fs->umask = 0;
931 READ_BUF(4);
932 open->op_createmode = be32_to_cpup(p++);
933 switch (open->op_createmode) {
934 case NFS4_CREATE_UNCHECKED:
935 case NFS4_CREATE_GUARDED:
936 status = nfsd4_decode_fattr(argp, open->op_bmval,
937 &open->op_iattr, &open->op_acl, &open->op_label,
938 &current->fs->umask);
939 if (status)
940 goto out;
941 break;
942 case NFS4_CREATE_EXCLUSIVE:
943 READ_BUF(NFS4_VERIFIER_SIZE);
944 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
945 break;
946 case NFS4_CREATE_EXCLUSIVE4_1:
947 if (argp->minorversion < 1)
948 goto xdr_error;
949 READ_BUF(NFS4_VERIFIER_SIZE);
950 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
951 status = nfsd4_decode_fattr(argp, open->op_bmval,
952 &open->op_iattr, &open->op_acl, &open->op_label,
953 &current->fs->umask);
954 if (status)
955 goto out;
956 break;
957 default:
958 goto xdr_error;
959 }
960 break;
961 default:
962 goto xdr_error;
963 }
964
965 /* open_claim */
966 READ_BUF(4);
967 open->op_claim_type = be32_to_cpup(p++);
968 switch (open->op_claim_type) {
969 case NFS4_OPEN_CLAIM_NULL:
970 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
971 READ_BUF(4);
972 open->op_fname.len = be32_to_cpup(p++);
973 READ_BUF(open->op_fname.len);
974 SAVEMEM(open->op_fname.data, open->op_fname.len);
975 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
976 return status;
977 break;
978 case NFS4_OPEN_CLAIM_PREVIOUS:
979 READ_BUF(4);
980 open->op_delegate_type = be32_to_cpup(p++);
981 break;
982 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
983 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
984 if (status)
985 return status;
986 READ_BUF(4);
987 open->op_fname.len = be32_to_cpup(p++);
988 READ_BUF(open->op_fname.len);
989 SAVEMEM(open->op_fname.data, open->op_fname.len);
990 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
991 return status;
992 break;
993 case NFS4_OPEN_CLAIM_FH:
994 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
995 if (argp->minorversion < 1)
996 goto xdr_error;
997 /* void */
998 break;
999 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1000 if (argp->minorversion < 1)
1001 goto xdr_error;
1002 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1003 if (status)
1004 return status;
1005 break;
1006 default:
1007 goto xdr_error;
1008 }
1009
1010 DECODE_TAIL;
1011 }
1012
1013 static __be32
1014 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1015 {
1016 DECODE_HEAD;
1017
1018 if (argp->minorversion >= 1)
1019 return nfserr_notsupp;
1020
1021 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1022 if (status)
1023 return status;
1024 READ_BUF(4);
1025 open_conf->oc_seqid = be32_to_cpup(p++);
1026
1027 DECODE_TAIL;
1028 }
1029
1030 static __be32
1031 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1032 {
1033 DECODE_HEAD;
1034
1035 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1036 if (status)
1037 return status;
1038 READ_BUF(4);
1039 open_down->od_seqid = be32_to_cpup(p++);
1040 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1041 &open_down->od_deleg_want, NULL);
1042 if (status)
1043 return status;
1044 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1045 if (status)
1046 return status;
1047 DECODE_TAIL;
1048 }
1049
1050 static __be32
1051 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1052 {
1053 DECODE_HEAD;
1054
1055 READ_BUF(4);
1056 putfh->pf_fhlen = be32_to_cpup(p++);
1057 if (putfh->pf_fhlen > NFS4_FHSIZE)
1058 goto xdr_error;
1059 READ_BUF(putfh->pf_fhlen);
1060 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1061
1062 DECODE_TAIL;
1063 }
1064
1065 static __be32
1066 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1067 {
1068 if (argp->minorversion == 0)
1069 return nfs_ok;
1070 return nfserr_notsupp;
1071 }
1072
1073 static __be32
1074 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1075 {
1076 DECODE_HEAD;
1077
1078 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1079 if (status)
1080 return status;
1081 READ_BUF(12);
1082 p = xdr_decode_hyper(p, &read->rd_offset);
1083 read->rd_length = be32_to_cpup(p++);
1084
1085 DECODE_TAIL;
1086 }
1087
1088 static __be32
1089 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1090 {
1091 DECODE_HEAD;
1092
1093 READ_BUF(24);
1094 p = xdr_decode_hyper(p, &readdir->rd_cookie);
1095 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1096 readdir->rd_dircount = be32_to_cpup(p++);
1097 readdir->rd_maxcount = be32_to_cpup(p++);
1098 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1099 goto out;
1100
1101 DECODE_TAIL;
1102 }
1103
1104 static __be32
1105 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1106 {
1107 DECODE_HEAD;
1108
1109 READ_BUF(4);
1110 remove->rm_namelen = be32_to_cpup(p++);
1111 READ_BUF(remove->rm_namelen);
1112 SAVEMEM(remove->rm_name, remove->rm_namelen);
1113 if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1114 return status;
1115
1116 DECODE_TAIL;
1117 }
1118
1119 static __be32
1120 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1121 {
1122 DECODE_HEAD;
1123
1124 READ_BUF(4);
1125 rename->rn_snamelen = be32_to_cpup(p++);
1126 READ_BUF(rename->rn_snamelen);
1127 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1128 READ_BUF(4);
1129 rename->rn_tnamelen = be32_to_cpup(p++);
1130 READ_BUF(rename->rn_tnamelen);
1131 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1132 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1133 return status;
1134 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1135 return status;
1136
1137 DECODE_TAIL;
1138 }
1139
1140 static __be32
1141 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1142 {
1143 DECODE_HEAD;
1144
1145 if (argp->minorversion >= 1)
1146 return nfserr_notsupp;
1147
1148 READ_BUF(sizeof(clientid_t));
1149 COPYMEM(clientid, sizeof(clientid_t));
1150
1151 DECODE_TAIL;
1152 }
1153
1154 static __be32
1155 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1156 struct nfsd4_secinfo *secinfo)
1157 {
1158 DECODE_HEAD;
1159
1160 READ_BUF(4);
1161 secinfo->si_namelen = be32_to_cpup(p++);
1162 READ_BUF(secinfo->si_namelen);
1163 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1164 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1165 if (status)
1166 return status;
1167 DECODE_TAIL;
1168 }
1169
1170 static __be32
1171 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1172 struct nfsd4_secinfo_no_name *sin)
1173 {
1174 DECODE_HEAD;
1175
1176 READ_BUF(4);
1177 sin->sin_style = be32_to_cpup(p++);
1178 DECODE_TAIL;
1179 }
1180
1181 static __be32
1182 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1183 {
1184 __be32 status;
1185
1186 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1187 if (status)
1188 return status;
1189 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1190 &setattr->sa_acl, &setattr->sa_label, NULL);
1191 }
1192
1193 static __be32
1194 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1195 {
1196 DECODE_HEAD;
1197
1198 if (argp->minorversion >= 1)
1199 return nfserr_notsupp;
1200
1201 READ_BUF(NFS4_VERIFIER_SIZE);
1202 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1203
1204 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1205 if (status)
1206 return nfserr_bad_xdr;
1207 READ_BUF(8);
1208 setclientid->se_callback_prog = be32_to_cpup(p++);
1209 setclientid->se_callback_netid_len = be32_to_cpup(p++);
1210 READ_BUF(setclientid->se_callback_netid_len);
1211 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1212 READ_BUF(4);
1213 setclientid->se_callback_addr_len = be32_to_cpup(p++);
1214
1215 READ_BUF(setclientid->se_callback_addr_len);
1216 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1217 READ_BUF(4);
1218 setclientid->se_callback_ident = be32_to_cpup(p++);
1219
1220 DECODE_TAIL;
1221 }
1222
1223 static __be32
1224 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1225 {
1226 DECODE_HEAD;
1227
1228 if (argp->minorversion >= 1)
1229 return nfserr_notsupp;
1230
1231 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1232 COPYMEM(&scd_c->sc_clientid, 8);
1233 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1234
1235 DECODE_TAIL;
1236 }
1237
1238 /* Also used for NVERIFY */
1239 static __be32
1240 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1241 {
1242 DECODE_HEAD;
1243
1244 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1245 goto out;
1246
1247 /* For convenience's sake, we compare raw xdr'd attributes in
1248 * nfsd4_proc_verify */
1249
1250 READ_BUF(4);
1251 verify->ve_attrlen = be32_to_cpup(p++);
1252 READ_BUF(verify->ve_attrlen);
1253 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1254
1255 DECODE_TAIL;
1256 }
1257
1258 static __be32
1259 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1260 {
1261 int avail;
1262 int len;
1263 DECODE_HEAD;
1264
1265 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1266 if (status)
1267 return status;
1268 READ_BUF(16);
1269 p = xdr_decode_hyper(p, &write->wr_offset);
1270 write->wr_stable_how = be32_to_cpup(p++);
1271 if (write->wr_stable_how > NFS_FILE_SYNC)
1272 goto xdr_error;
1273 write->wr_buflen = be32_to_cpup(p++);
1274
1275 /* Sorry .. no magic macros for this.. *
1276 * READ_BUF(write->wr_buflen);
1277 * SAVEMEM(write->wr_buf, write->wr_buflen);
1278 */
1279 avail = (char*)argp->end - (char*)argp->p;
1280 if (avail + argp->pagelen < write->wr_buflen) {
1281 dprintk("NFSD: xdr error (%s:%d)\n",
1282 __FILE__, __LINE__);
1283 goto xdr_error;
1284 }
1285 write->wr_head.iov_base = p;
1286 write->wr_head.iov_len = avail;
1287 write->wr_pagelist = argp->pagelist;
1288
1289 len = XDR_QUADLEN(write->wr_buflen) << 2;
1290 if (len >= avail) {
1291 int pages;
1292
1293 len -= avail;
1294
1295 pages = len >> PAGE_SHIFT;
1296 argp->pagelist += pages;
1297 argp->pagelen -= pages * PAGE_SIZE;
1298 len -= pages * PAGE_SIZE;
1299
1300 next_decode_page(argp);
1301 }
1302 argp->p += XDR_QUADLEN(len);
1303
1304 DECODE_TAIL;
1305 }
1306
1307 static __be32
1308 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1309 {
1310 DECODE_HEAD;
1311
1312 if (argp->minorversion >= 1)
1313 return nfserr_notsupp;
1314
1315 READ_BUF(12);
1316 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1317 rlockowner->rl_owner.len = be32_to_cpup(p++);
1318 READ_BUF(rlockowner->rl_owner.len);
1319 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1320
1321 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1322 return nfserr_inval;
1323 DECODE_TAIL;
1324 }
1325
1326 static __be32
1327 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1328 struct nfsd4_exchange_id *exid)
1329 {
1330 int dummy, tmp;
1331 DECODE_HEAD;
1332
1333 READ_BUF(NFS4_VERIFIER_SIZE);
1334 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1335
1336 status = nfsd4_decode_opaque(argp, &exid->clname);
1337 if (status)
1338 return nfserr_bad_xdr;
1339
1340 READ_BUF(4);
1341 exid->flags = be32_to_cpup(p++);
1342
1343 /* Ignore state_protect4_a */
1344 READ_BUF(4);
1345 exid->spa_how = be32_to_cpup(p++);
1346 switch (exid->spa_how) {
1347 case SP4_NONE:
1348 break;
1349 case SP4_MACH_CRED:
1350 /* spo_must_enforce */
1351 status = nfsd4_decode_bitmap(argp,
1352 exid->spo_must_enforce);
1353 if (status)
1354 goto out;
1355 /* spo_must_allow */
1356 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1357 if (status)
1358 goto out;
1359 break;
1360 case SP4_SSV:
1361 /* ssp_ops */
1362 READ_BUF(4);
1363 dummy = be32_to_cpup(p++);
1364 READ_BUF(dummy * 4);
1365 p += dummy;
1366
1367 READ_BUF(4);
1368 dummy = be32_to_cpup(p++);
1369 READ_BUF(dummy * 4);
1370 p += dummy;
1371
1372 /* ssp_hash_algs<> */
1373 READ_BUF(4);
1374 tmp = be32_to_cpup(p++);
1375 while (tmp--) {
1376 READ_BUF(4);
1377 dummy = be32_to_cpup(p++);
1378 READ_BUF(dummy);
1379 p += XDR_QUADLEN(dummy);
1380 }
1381
1382 /* ssp_encr_algs<> */
1383 READ_BUF(4);
1384 tmp = be32_to_cpup(p++);
1385 while (tmp--) {
1386 READ_BUF(4);
1387 dummy = be32_to_cpup(p++);
1388 READ_BUF(dummy);
1389 p += XDR_QUADLEN(dummy);
1390 }
1391
1392 /* ssp_window and ssp_num_gss_handles */
1393 READ_BUF(8);
1394 dummy = be32_to_cpup(p++);
1395 dummy = be32_to_cpup(p++);
1396 break;
1397 default:
1398 goto xdr_error;
1399 }
1400
1401 /* Ignore Implementation ID */
1402 READ_BUF(4); /* nfs_impl_id4 array length */
1403 dummy = be32_to_cpup(p++);
1404
1405 if (dummy > 1)
1406 goto xdr_error;
1407
1408 if (dummy == 1) {
1409 /* nii_domain */
1410 READ_BUF(4);
1411 dummy = be32_to_cpup(p++);
1412 READ_BUF(dummy);
1413 p += XDR_QUADLEN(dummy);
1414
1415 /* nii_name */
1416 READ_BUF(4);
1417 dummy = be32_to_cpup(p++);
1418 READ_BUF(dummy);
1419 p += XDR_QUADLEN(dummy);
1420
1421 /* nii_date */
1422 READ_BUF(12);
1423 p += 3;
1424 }
1425 DECODE_TAIL;
1426 }
1427
1428 static __be32
1429 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1430 struct nfsd4_create_session *sess)
1431 {
1432 DECODE_HEAD;
1433 u32 dummy;
1434
1435 READ_BUF(16);
1436 COPYMEM(&sess->clientid, 8);
1437 sess->seqid = be32_to_cpup(p++);
1438 sess->flags = be32_to_cpup(p++);
1439
1440 /* Fore channel attrs */
1441 READ_BUF(28);
1442 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1443 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1444 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1445 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1446 sess->fore_channel.maxops = be32_to_cpup(p++);
1447 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1448 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1449 if (sess->fore_channel.nr_rdma_attrs == 1) {
1450 READ_BUF(4);
1451 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1452 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1453 dprintk("Too many fore channel attr bitmaps!\n");
1454 goto xdr_error;
1455 }
1456
1457 /* Back channel attrs */
1458 READ_BUF(28);
1459 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1460 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1461 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1462 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1463 sess->back_channel.maxops = be32_to_cpup(p++);
1464 sess->back_channel.maxreqs = be32_to_cpup(p++);
1465 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1466 if (sess->back_channel.nr_rdma_attrs == 1) {
1467 READ_BUF(4);
1468 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1469 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1470 dprintk("Too many back channel attr bitmaps!\n");
1471 goto xdr_error;
1472 }
1473
1474 READ_BUF(4);
1475 sess->callback_prog = be32_to_cpup(p++);
1476 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1477 DECODE_TAIL;
1478 }
1479
1480 static __be32
1481 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1482 struct nfsd4_destroy_session *destroy_session)
1483 {
1484 DECODE_HEAD;
1485 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1486 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1487
1488 DECODE_TAIL;
1489 }
1490
1491 static __be32
1492 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1493 struct nfsd4_free_stateid *free_stateid)
1494 {
1495 DECODE_HEAD;
1496
1497 READ_BUF(sizeof(stateid_t));
1498 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1499 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1500
1501 DECODE_TAIL;
1502 }
1503
1504 static __be32
1505 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1506 struct nfsd4_sequence *seq)
1507 {
1508 DECODE_HEAD;
1509
1510 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1511 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1512 seq->seqid = be32_to_cpup(p++);
1513 seq->slotid = be32_to_cpup(p++);
1514 seq->maxslots = be32_to_cpup(p++);
1515 seq->cachethis = be32_to_cpup(p++);
1516
1517 DECODE_TAIL;
1518 }
1519
1520 static __be32
1521 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1522 {
1523 int i;
1524 __be32 *p, status;
1525 struct nfsd4_test_stateid_id *stateid;
1526
1527 READ_BUF(4);
1528 test_stateid->ts_num_ids = ntohl(*p++);
1529
1530 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1531
1532 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1533 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1534 if (!stateid) {
1535 status = nfserrno(-ENOMEM);
1536 goto out;
1537 }
1538
1539 INIT_LIST_HEAD(&stateid->ts_id_list);
1540 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1541
1542 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1543 if (status)
1544 goto out;
1545 }
1546
1547 status = 0;
1548 out:
1549 return status;
1550 xdr_error:
1551 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1552 status = nfserr_bad_xdr;
1553 goto out;
1554 }
1555
1556 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1557 {
1558 DECODE_HEAD;
1559
1560 READ_BUF(8);
1561 COPYMEM(&dc->clientid, 8);
1562
1563 DECODE_TAIL;
1564 }
1565
1566 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1567 {
1568 DECODE_HEAD;
1569
1570 READ_BUF(4);
1571 rc->rca_one_fs = be32_to_cpup(p++);
1572
1573 DECODE_TAIL;
1574 }
1575
1576 #ifdef CONFIG_NFSD_PNFS
1577 static __be32
1578 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1579 struct nfsd4_getdeviceinfo *gdev)
1580 {
1581 DECODE_HEAD;
1582 u32 num, i;
1583
1584 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1585 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1586 gdev->gd_layout_type = be32_to_cpup(p++);
1587 gdev->gd_maxcount = be32_to_cpup(p++);
1588 num = be32_to_cpup(p++);
1589 if (num) {
1590 READ_BUF(4 * num);
1591 gdev->gd_notify_types = be32_to_cpup(p++);
1592 for (i = 1; i < num; i++) {
1593 if (be32_to_cpup(p++)) {
1594 status = nfserr_inval;
1595 goto out;
1596 }
1597 }
1598 }
1599 DECODE_TAIL;
1600 }
1601
1602 static __be32
1603 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1604 struct nfsd4_layoutget *lgp)
1605 {
1606 DECODE_HEAD;
1607
1608 READ_BUF(36);
1609 lgp->lg_signal = be32_to_cpup(p++);
1610 lgp->lg_layout_type = be32_to_cpup(p++);
1611 lgp->lg_seg.iomode = be32_to_cpup(p++);
1612 p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1613 p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1614 p = xdr_decode_hyper(p, &lgp->lg_minlength);
1615
1616 status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1617 if (status)
1618 return status;
1619
1620 READ_BUF(4);
1621 lgp->lg_maxcount = be32_to_cpup(p++);
1622
1623 DECODE_TAIL;
1624 }
1625
1626 static __be32
1627 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1628 struct nfsd4_layoutcommit *lcp)
1629 {
1630 DECODE_HEAD;
1631 u32 timechange;
1632
1633 READ_BUF(20);
1634 p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1635 p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1636 lcp->lc_reclaim = be32_to_cpup(p++);
1637
1638 status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1639 if (status)
1640 return status;
1641
1642 READ_BUF(4);
1643 lcp->lc_newoffset = be32_to_cpup(p++);
1644 if (lcp->lc_newoffset) {
1645 READ_BUF(8);
1646 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1647 } else
1648 lcp->lc_last_wr = 0;
1649 READ_BUF(4);
1650 timechange = be32_to_cpup(p++);
1651 if (timechange) {
1652 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1653 if (status)
1654 return status;
1655 } else {
1656 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1657 }
1658 READ_BUF(8);
1659 lcp->lc_layout_type = be32_to_cpup(p++);
1660
1661 /*
1662 * Save the layout update in XDR format and let the layout driver deal
1663 * with it later.
1664 */
1665 lcp->lc_up_len = be32_to_cpup(p++);
1666 if (lcp->lc_up_len > 0) {
1667 READ_BUF(lcp->lc_up_len);
1668 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1669 }
1670
1671 DECODE_TAIL;
1672 }
1673
1674 static __be32
1675 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1676 struct nfsd4_layoutreturn *lrp)
1677 {
1678 DECODE_HEAD;
1679
1680 READ_BUF(16);
1681 lrp->lr_reclaim = be32_to_cpup(p++);
1682 lrp->lr_layout_type = be32_to_cpup(p++);
1683 lrp->lr_seg.iomode = be32_to_cpup(p++);
1684 lrp->lr_return_type = be32_to_cpup(p++);
1685 if (lrp->lr_return_type == RETURN_FILE) {
1686 READ_BUF(16);
1687 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1688 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1689
1690 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1691 if (status)
1692 return status;
1693
1694 READ_BUF(4);
1695 lrp->lrf_body_len = be32_to_cpup(p++);
1696 if (lrp->lrf_body_len > 0) {
1697 READ_BUF(lrp->lrf_body_len);
1698 READMEM(lrp->lrf_body, lrp->lrf_body_len);
1699 }
1700 } else {
1701 lrp->lr_seg.offset = 0;
1702 lrp->lr_seg.length = NFS4_MAX_UINT64;
1703 }
1704
1705 DECODE_TAIL;
1706 }
1707 #endif /* CONFIG_NFSD_PNFS */
1708
1709 static __be32
1710 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1711 struct nfsd4_fallocate *fallocate)
1712 {
1713 DECODE_HEAD;
1714
1715 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1716 if (status)
1717 return status;
1718
1719 READ_BUF(16);
1720 p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1721 xdr_decode_hyper(p, &fallocate->falloc_length);
1722
1723 DECODE_TAIL;
1724 }
1725
1726 static __be32
1727 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1728 {
1729 DECODE_HEAD;
1730
1731 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1732 if (status)
1733 return status;
1734 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1735 if (status)
1736 return status;
1737
1738 READ_BUF(8 + 8 + 8);
1739 p = xdr_decode_hyper(p, &clone->cl_src_pos);
1740 p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1741 p = xdr_decode_hyper(p, &clone->cl_count);
1742 DECODE_TAIL;
1743 }
1744
1745 static __be32
1746 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1747 {
1748 DECODE_HEAD;
1749 unsigned int tmp;
1750
1751 status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1752 if (status)
1753 return status;
1754 status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1755 if (status)
1756 return status;
1757
1758 READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1759 p = xdr_decode_hyper(p, &copy->cp_src_pos);
1760 p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1761 p = xdr_decode_hyper(p, &copy->cp_count);
1762 copy->cp_consecutive = be32_to_cpup(p++);
1763 copy->cp_synchronous = be32_to_cpup(p++);
1764 tmp = be32_to_cpup(p); /* Source server list not supported */
1765
1766 DECODE_TAIL;
1767 }
1768
1769 static __be32
1770 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1771 {
1772 DECODE_HEAD;
1773
1774 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1775 if (status)
1776 return status;
1777
1778 READ_BUF(8 + 4);
1779 p = xdr_decode_hyper(p, &seek->seek_offset);
1780 seek->seek_whence = be32_to_cpup(p);
1781
1782 DECODE_TAIL;
1783 }
1784
1785 static __be32
1786 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1787 {
1788 return nfs_ok;
1789 }
1790
1791 static __be32
1792 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1793 {
1794 return nfserr_notsupp;
1795 }
1796
1797 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1798
1799 static const nfsd4_dec nfsd4_dec_ops[] = {
1800 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1801 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1802 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1803 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1804 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1805 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1806 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1807 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1808 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1809 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1810 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1811 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1812 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1813 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1814 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1815 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1816 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1817 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1818 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1819 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1820 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1821 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1822 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1823 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1824 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1825 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1826 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1827 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1828 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1829 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1830 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1831 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1832 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1833 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1834 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1835 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1836 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1837
1838 /* new operations for NFSv4.1 */
1839 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1840 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1841 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1842 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1843 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1844 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1845 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1846 #ifdef CONFIG_NFSD_PNFS
1847 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1848 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1849 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit,
1850 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget,
1851 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn,
1852 #else
1853 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1854 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1855 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1856 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1857 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1858 #endif
1859 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1860 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1861 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1862 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1863 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1864 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1865 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1866
1867 /* new operations for NFSv4.2 */
1868 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1869 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy,
1870 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
1871 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1872 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
1873 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
1874 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
1875 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp,
1876 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1877 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1878 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
1879 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
1880 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone,
1881 };
1882
1883 static inline bool
1884 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1885 {
1886 if (op->opnum < FIRST_NFS4_OP)
1887 return false;
1888 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1889 return false;
1890 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1891 return false;
1892 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1893 return false;
1894 return true;
1895 }
1896
1897 static __be32
1898 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1899 {
1900 DECODE_HEAD;
1901 struct nfsd4_op *op;
1902 bool cachethis = false;
1903 int auth_slack= argp->rqstp->rq_auth_slack;
1904 int max_reply = auth_slack + 8; /* opcnt, status */
1905 int readcount = 0;
1906 int readbytes = 0;
1907 int i;
1908
1909 READ_BUF(4);
1910 argp->taglen = be32_to_cpup(p++);
1911 READ_BUF(argp->taglen);
1912 SAVEMEM(argp->tag, argp->taglen);
1913 READ_BUF(8);
1914 argp->minorversion = be32_to_cpup(p++);
1915 argp->opcnt = be32_to_cpup(p++);
1916 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1917
1918 if (argp->taglen > NFSD4_MAX_TAGLEN)
1919 goto xdr_error;
1920 /*
1921 * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
1922 * here, so we return success at the xdr level so that
1923 * nfsd4_proc can handle this is an NFS-level error.
1924 */
1925 if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1926 return 0;
1927
1928 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1929 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1930 if (!argp->ops) {
1931 argp->ops = argp->iops;
1932 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1933 goto xdr_error;
1934 }
1935 }
1936
1937 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1938 argp->opcnt = 0;
1939
1940 for (i = 0; i < argp->opcnt; i++) {
1941 op = &argp->ops[i];
1942 op->replay = NULL;
1943
1944 READ_BUF(4);
1945 op->opnum = be32_to_cpup(p++);
1946
1947 if (nfsd4_opnum_in_range(argp, op))
1948 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1949 else {
1950 op->opnum = OP_ILLEGAL;
1951 op->status = nfserr_op_illegal;
1952 }
1953 op->opdesc = OPDESC(op);
1954 /*
1955 * We'll try to cache the result in the DRC if any one
1956 * op in the compound wants to be cached:
1957 */
1958 cachethis |= nfsd4_cache_this_op(op);
1959
1960 if (op->opnum == OP_READ) {
1961 readcount++;
1962 readbytes += nfsd4_max_reply(argp->rqstp, op);
1963 } else
1964 max_reply += nfsd4_max_reply(argp->rqstp, op);
1965 /*
1966 * OP_LOCK and OP_LOCKT may return a conflicting lock.
1967 * (Special case because it will just skip encoding this
1968 * if it runs out of xdr buffer space, and it is the only
1969 * operation that behaves this way.)
1970 */
1971 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1972 max_reply += NFS4_OPAQUE_LIMIT;
1973
1974 if (op->status) {
1975 argp->opcnt = i+1;
1976 break;
1977 }
1978 }
1979 /* Sessions make the DRC unnecessary: */
1980 if (argp->minorversion)
1981 cachethis = false;
1982 svc_reserve(argp->rqstp, max_reply + readbytes);
1983 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1984
1985 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1986 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1987
1988 DECODE_TAIL;
1989 }
1990
1991 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
1992 struct svc_export *exp)
1993 {
1994 if (exp->ex_flags & NFSEXP_V4ROOT) {
1995 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
1996 *p++ = 0;
1997 } else if (IS_I_VERSION(inode)) {
1998 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
1999 } else {
2000 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2001 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2002 }
2003 return p;
2004 }
2005
2006 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2007 {
2008 *p++ = cpu_to_be32(c->atomic);
2009 if (c->change_supported) {
2010 p = xdr_encode_hyper(p, c->before_change);
2011 p = xdr_encode_hyper(p, c->after_change);
2012 } else {
2013 *p++ = cpu_to_be32(c->before_ctime_sec);
2014 *p++ = cpu_to_be32(c->before_ctime_nsec);
2015 *p++ = cpu_to_be32(c->after_ctime_sec);
2016 *p++ = cpu_to_be32(c->after_ctime_nsec);
2017 }
2018 return p;
2019 }
2020
2021 /* Encode as an array of strings the string given with components
2022 * separated @sep, escaped with esc_enter and esc_exit.
2023 */
2024 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2025 char *components, char esc_enter,
2026 char esc_exit)
2027 {
2028 __be32 *p;
2029 __be32 pathlen;
2030 int pathlen_offset;
2031 int strlen, count=0;
2032 char *str, *end, *next;
2033
2034 dprintk("nfsd4_encode_components(%s)\n", components);
2035
2036 pathlen_offset = xdr->buf->len;
2037 p = xdr_reserve_space(xdr, 4);
2038 if (!p)
2039 return nfserr_resource;
2040 p++; /* We will fill this in with @count later */
2041
2042 end = str = components;
2043 while (*end) {
2044 bool found_esc = false;
2045
2046 /* try to parse as esc_start, ..., esc_end, sep */
2047 if (*str == esc_enter) {
2048 for (; *end && (*end != esc_exit); end++)
2049 /* find esc_exit or end of string */;
2050 next = end + 1;
2051 if (*end && (!*next || *next == sep)) {
2052 str++;
2053 found_esc = true;
2054 }
2055 }
2056
2057 if (!found_esc)
2058 for (; *end && (*end != sep); end++)
2059 /* find sep or end of string */;
2060
2061 strlen = end - str;
2062 if (strlen) {
2063 p = xdr_reserve_space(xdr, strlen + 4);
2064 if (!p)
2065 return nfserr_resource;
2066 p = xdr_encode_opaque(p, str, strlen);
2067 count++;
2068 }
2069 else
2070 end++;
2071 if (found_esc)
2072 end = next;
2073
2074 str = end;
2075 }
2076 pathlen = htonl(count);
2077 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2078 return 0;
2079 }
2080
2081 /* Encode as an array of strings the string given with components
2082 * separated @sep.
2083 */
2084 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2085 char *components)
2086 {
2087 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2088 }
2089
2090 /*
2091 * encode a location element of a fs_locations structure
2092 */
2093 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2094 struct nfsd4_fs_location *location)
2095 {
2096 __be32 status;
2097
2098 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2099 '[', ']');
2100 if (status)
2101 return status;
2102 status = nfsd4_encode_components(xdr, '/', location->path);
2103 if (status)
2104 return status;
2105 return 0;
2106 }
2107
2108 /*
2109 * Encode a path in RFC3530 'pathname4' format
2110 */
2111 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2112 const struct path *root,
2113 const struct path *path)
2114 {
2115 struct path cur = *path;
2116 __be32 *p;
2117 struct dentry **components = NULL;
2118 unsigned int ncomponents = 0;
2119 __be32 err = nfserr_jukebox;
2120
2121 dprintk("nfsd4_encode_components(");
2122
2123 path_get(&cur);
2124 /* First walk the path up to the nfsd root, and store the
2125 * dentries/path components in an array.
2126 */
2127 for (;;) {
2128 if (path_equal(&cur, root))
2129 break;
2130 if (cur.dentry == cur.mnt->mnt_root) {
2131 if (follow_up(&cur))
2132 continue;
2133 goto out_free;
2134 }
2135 if ((ncomponents & 15) == 0) {
2136 struct dentry **new;
2137 new = krealloc(components,
2138 sizeof(*new) * (ncomponents + 16),
2139 GFP_KERNEL);
2140 if (!new)
2141 goto out_free;
2142 components = new;
2143 }
2144 components[ncomponents++] = cur.dentry;
2145 cur.dentry = dget_parent(cur.dentry);
2146 }
2147 err = nfserr_resource;
2148 p = xdr_reserve_space(xdr, 4);
2149 if (!p)
2150 goto out_free;
2151 *p++ = cpu_to_be32(ncomponents);
2152
2153 while (ncomponents) {
2154 struct dentry *dentry = components[ncomponents - 1];
2155 unsigned int len;
2156
2157 spin_lock(&dentry->d_lock);
2158 len = dentry->d_name.len;
2159 p = xdr_reserve_space(xdr, len + 4);
2160 if (!p) {
2161 spin_unlock(&dentry->d_lock);
2162 goto out_free;
2163 }
2164 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2165 dprintk("/%pd", dentry);
2166 spin_unlock(&dentry->d_lock);
2167 dput(dentry);
2168 ncomponents--;
2169 }
2170
2171 err = 0;
2172 out_free:
2173 dprintk(")\n");
2174 while (ncomponents)
2175 dput(components[--ncomponents]);
2176 kfree(components);
2177 path_put(&cur);
2178 return err;
2179 }
2180
2181 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2182 struct svc_rqst *rqstp, const struct path *path)
2183 {
2184 struct svc_export *exp_ps;
2185 __be32 res;
2186
2187 exp_ps = rqst_find_fsidzero_export(rqstp);
2188 if (IS_ERR(exp_ps))
2189 return nfserrno(PTR_ERR(exp_ps));
2190 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2191 exp_put(exp_ps);
2192 return res;
2193 }
2194
2195 /*
2196 * encode a fs_locations structure
2197 */
2198 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2199 struct svc_rqst *rqstp, struct svc_export *exp)
2200 {
2201 __be32 status;
2202 int i;
2203 __be32 *p;
2204 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2205
2206 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2207 if (status)
2208 return status;
2209 p = xdr_reserve_space(xdr, 4);
2210 if (!p)
2211 return nfserr_resource;
2212 *p++ = cpu_to_be32(fslocs->locations_count);
2213 for (i=0; i<fslocs->locations_count; i++) {
2214 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2215 if (status)
2216 return status;
2217 }
2218 return 0;
2219 }
2220
2221 static u32 nfs4_file_type(umode_t mode)
2222 {
2223 switch (mode & S_IFMT) {
2224 case S_IFIFO: return NF4FIFO;
2225 case S_IFCHR: return NF4CHR;
2226 case S_IFDIR: return NF4DIR;
2227 case S_IFBLK: return NF4BLK;
2228 case S_IFLNK: return NF4LNK;
2229 case S_IFREG: return NF4REG;
2230 case S_IFSOCK: return NF4SOCK;
2231 default: return NF4BAD;
2232 };
2233 }
2234
2235 static inline __be32
2236 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2237 struct nfs4_ace *ace)
2238 {
2239 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2240 return nfs4_acl_write_who(xdr, ace->whotype);
2241 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2242 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2243 else
2244 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2245 }
2246
2247 static inline __be32
2248 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2249 {
2250 __be32 *p;
2251 unsigned long i = hweight_long(layout_types);
2252
2253 p = xdr_reserve_space(xdr, 4 + 4 * i);
2254 if (!p)
2255 return nfserr_resource;
2256
2257 *p++ = cpu_to_be32(i);
2258
2259 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2260 if (layout_types & (1 << i))
2261 *p++ = cpu_to_be32(i);
2262
2263 return 0;
2264 }
2265
2266 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2267 FATTR4_WORD0_RDATTR_ERROR)
2268 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2269 #define WORD2_ABSENT_FS_ATTRS 0
2270
2271 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2272 static inline __be32
2273 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2274 void *context, int len)
2275 {
2276 __be32 *p;
2277
2278 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2279 if (!p)
2280 return nfserr_resource;
2281
2282 /*
2283 * For now we use a 0 here to indicate the null translation; in
2284 * the future we may place a call to translation code here.
2285 */
2286 *p++ = cpu_to_be32(0); /* lfs */
2287 *p++ = cpu_to_be32(0); /* pi */
2288 p = xdr_encode_opaque(p, context, len);
2289 return 0;
2290 }
2291 #else
2292 static inline __be32
2293 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2294 void *context, int len)
2295 { return 0; }
2296 #endif
2297
2298 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2299 {
2300 /* As per referral draft: */
2301 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2302 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2303 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2304 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2305 *rdattr_err = NFSERR_MOVED;
2306 else
2307 return nfserr_moved;
2308 }
2309 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2310 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2311 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2312 return 0;
2313 }
2314
2315
2316 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2317 {
2318 struct path path = exp->ex_path;
2319 int err;
2320
2321 path_get(&path);
2322 while (follow_up(&path)) {
2323 if (path.dentry != path.mnt->mnt_root)
2324 break;
2325 }
2326 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2327 path_put(&path);
2328 return err;
2329 }
2330
2331 static __be32
2332 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2333 {
2334 __be32 *p;
2335
2336 if (bmval2) {
2337 p = xdr_reserve_space(xdr, 16);
2338 if (!p)
2339 goto out_resource;
2340 *p++ = cpu_to_be32(3);
2341 *p++ = cpu_to_be32(bmval0);
2342 *p++ = cpu_to_be32(bmval1);
2343 *p++ = cpu_to_be32(bmval2);
2344 } else if (bmval1) {
2345 p = xdr_reserve_space(xdr, 12);
2346 if (!p)
2347 goto out_resource;
2348 *p++ = cpu_to_be32(2);
2349 *p++ = cpu_to_be32(bmval0);
2350 *p++ = cpu_to_be32(bmval1);
2351 } else {
2352 p = xdr_reserve_space(xdr, 8);
2353 if (!p)
2354 goto out_resource;
2355 *p++ = cpu_to_be32(1);
2356 *p++ = cpu_to_be32(bmval0);
2357 }
2358
2359 return 0;
2360 out_resource:
2361 return nfserr_resource;
2362 }
2363
2364 /*
2365 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2366 * ourselves.
2367 */
2368 static __be32
2369 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2370 struct svc_export *exp,
2371 struct dentry *dentry, u32 *bmval,
2372 struct svc_rqst *rqstp, int ignore_crossmnt)
2373 {
2374 u32 bmval0 = bmval[0];
2375 u32 bmval1 = bmval[1];
2376 u32 bmval2 = bmval[2];
2377 struct kstat stat;
2378 struct svc_fh *tempfh = NULL;
2379 struct kstatfs statfs;
2380 __be32 *p;
2381 int starting_len = xdr->buf->len;
2382 int attrlen_offset;
2383 __be32 attrlen;
2384 u32 dummy;
2385 u64 dummy64;
2386 u32 rdattr_err = 0;
2387 __be32 status;
2388 int err;
2389 struct nfs4_acl *acl = NULL;
2390 void *context = NULL;
2391 int contextlen;
2392 bool contextsupport = false;
2393 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2394 u32 minorversion = resp->cstate.minorversion;
2395 struct path path = {
2396 .mnt = exp->ex_path.mnt,
2397 .dentry = dentry,
2398 };
2399 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2400
2401 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2402 BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2403
2404 if (exp->ex_fslocs.migrated) {
2405 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2406 if (status)
2407 goto out;
2408 }
2409
2410 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2411 if (err)
2412 goto out_nfserr;
2413 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2414 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2415 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2416 FATTR4_WORD1_SPACE_TOTAL))) {
2417 err = vfs_statfs(&path, &statfs);
2418 if (err)
2419 goto out_nfserr;
2420 }
2421 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2422 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2423 status = nfserr_jukebox;
2424 if (!tempfh)
2425 goto out;
2426 fh_init(tempfh, NFS4_FHSIZE);
2427 status = fh_compose(tempfh, exp, dentry, NULL);
2428 if (status)
2429 goto out;
2430 fhp = tempfh;
2431 }
2432 if (bmval0 & FATTR4_WORD0_ACL) {
2433 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2434 if (err == -EOPNOTSUPP)
2435 bmval0 &= ~FATTR4_WORD0_ACL;
2436 else if (err == -EINVAL) {
2437 status = nfserr_attrnotsupp;
2438 goto out;
2439 } else if (err != 0)
2440 goto out_nfserr;
2441 }
2442
2443 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2444 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2445 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2446 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2447 err = security_inode_getsecctx(d_inode(dentry),
2448 &context, &contextlen);
2449 else
2450 err = -EOPNOTSUPP;
2451 contextsupport = (err == 0);
2452 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2453 if (err == -EOPNOTSUPP)
2454 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2455 else if (err)
2456 goto out_nfserr;
2457 }
2458 }
2459 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2460
2461 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2462 if (status)
2463 goto out;
2464
2465 attrlen_offset = xdr->buf->len;
2466 p = xdr_reserve_space(xdr, 4);
2467 if (!p)
2468 goto out_resource;
2469 p++; /* to be backfilled later */
2470
2471 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2472 u32 supp[3];
2473
2474 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2475
2476 if (!IS_POSIXACL(dentry->d_inode))
2477 supp[0] &= ~FATTR4_WORD0_ACL;
2478 if (!contextsupport)
2479 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2480 if (!supp[2]) {
2481 p = xdr_reserve_space(xdr, 12);
2482 if (!p)
2483 goto out_resource;
2484 *p++ = cpu_to_be32(2);
2485 *p++ = cpu_to_be32(supp[0]);
2486 *p++ = cpu_to_be32(supp[1]);
2487 } else {
2488 p = xdr_reserve_space(xdr, 16);
2489 if (!p)
2490 goto out_resource;
2491 *p++ = cpu_to_be32(3);
2492 *p++ = cpu_to_be32(supp[0]);
2493 *p++ = cpu_to_be32(supp[1]);
2494 *p++ = cpu_to_be32(supp[2]);
2495 }
2496 }
2497 if (bmval0 & FATTR4_WORD0_TYPE) {
2498 p = xdr_reserve_space(xdr, 4);
2499 if (!p)
2500 goto out_resource;
2501 dummy = nfs4_file_type(stat.mode);
2502 if (dummy == NF4BAD) {
2503 status = nfserr_serverfault;
2504 goto out;
2505 }
2506 *p++ = cpu_to_be32(dummy);
2507 }
2508 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2509 p = xdr_reserve_space(xdr, 4);
2510 if (!p)
2511 goto out_resource;
2512 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2513 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2514 else
2515 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2516 NFS4_FH_VOL_RENAME);
2517 }
2518 if (bmval0 & FATTR4_WORD0_CHANGE) {
2519 p = xdr_reserve_space(xdr, 8);
2520 if (!p)
2521 goto out_resource;
2522 p = encode_change(p, &stat, d_inode(dentry), exp);
2523 }
2524 if (bmval0 & FATTR4_WORD0_SIZE) {
2525 p = xdr_reserve_space(xdr, 8);
2526 if (!p)
2527 goto out_resource;
2528 p = xdr_encode_hyper(p, stat.size);
2529 }
2530 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2531 p = xdr_reserve_space(xdr, 4);
2532 if (!p)
2533 goto out_resource;
2534 *p++ = cpu_to_be32(1);
2535 }
2536 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2537 p = xdr_reserve_space(xdr, 4);
2538 if (!p)
2539 goto out_resource;
2540 *p++ = cpu_to_be32(1);
2541 }
2542 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2543 p = xdr_reserve_space(xdr, 4);
2544 if (!p)
2545 goto out_resource;
2546 *p++ = cpu_to_be32(0);
2547 }
2548 if (bmval0 & FATTR4_WORD0_FSID) {
2549 p = xdr_reserve_space(xdr, 16);
2550 if (!p)
2551 goto out_resource;
2552 if (exp->ex_fslocs.migrated) {
2553 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2554 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2555 } else switch(fsid_source(fhp)) {
2556 case FSIDSOURCE_FSID:
2557 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2558 p = xdr_encode_hyper(p, (u64)0);
2559 break;
2560 case FSIDSOURCE_DEV:
2561 *p++ = cpu_to_be32(0);
2562 *p++ = cpu_to_be32(MAJOR(stat.dev));
2563 *p++ = cpu_to_be32(0);
2564 *p++ = cpu_to_be32(MINOR(stat.dev));
2565 break;
2566 case FSIDSOURCE_UUID:
2567 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2568 EX_UUID_LEN);
2569 break;
2570 }
2571 }
2572 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2573 p = xdr_reserve_space(xdr, 4);
2574 if (!p)
2575 goto out_resource;
2576 *p++ = cpu_to_be32(0);
2577 }
2578 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2579 p = xdr_reserve_space(xdr, 4);
2580 if (!p)
2581 goto out_resource;
2582 *p++ = cpu_to_be32(nn->nfsd4_lease);
2583 }
2584 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2585 p = xdr_reserve_space(xdr, 4);
2586 if (!p)
2587 goto out_resource;
2588 *p++ = cpu_to_be32(rdattr_err);
2589 }
2590 if (bmval0 & FATTR4_WORD0_ACL) {
2591 struct nfs4_ace *ace;
2592
2593 if (acl == NULL) {
2594 p = xdr_reserve_space(xdr, 4);
2595 if (!p)
2596 goto out_resource;
2597
2598 *p++ = cpu_to_be32(0);
2599 goto out_acl;
2600 }
2601 p = xdr_reserve_space(xdr, 4);
2602 if (!p)
2603 goto out_resource;
2604 *p++ = cpu_to_be32(acl->naces);
2605
2606 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2607 p = xdr_reserve_space(xdr, 4*3);
2608 if (!p)
2609 goto out_resource;
2610 *p++ = cpu_to_be32(ace->type);
2611 *p++ = cpu_to_be32(ace->flag);
2612 *p++ = cpu_to_be32(ace->access_mask &
2613 NFS4_ACE_MASK_ALL);
2614 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2615 if (status)
2616 goto out;
2617 }
2618 }
2619 out_acl:
2620 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2621 p = xdr_reserve_space(xdr, 4);
2622 if (!p)
2623 goto out_resource;
2624 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2625 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2626 }
2627 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2628 p = xdr_reserve_space(xdr, 4);
2629 if (!p)
2630 goto out_resource;
2631 *p++ = cpu_to_be32(1);
2632 }
2633 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2634 p = xdr_reserve_space(xdr, 4);
2635 if (!p)
2636 goto out_resource;
2637 *p++ = cpu_to_be32(0);
2638 }
2639 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2640 p = xdr_reserve_space(xdr, 4);
2641 if (!p)
2642 goto out_resource;
2643 *p++ = cpu_to_be32(1);
2644 }
2645 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2646 p = xdr_reserve_space(xdr, 4);
2647 if (!p)
2648 goto out_resource;
2649 *p++ = cpu_to_be32(1);
2650 }
2651 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2652 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2653 if (!p)
2654 goto out_resource;
2655 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2656 fhp->fh_handle.fh_size);
2657 }
2658 if (bmval0 & FATTR4_WORD0_FILEID) {
2659 p = xdr_reserve_space(xdr, 8);
2660 if (!p)
2661 goto out_resource;
2662 p = xdr_encode_hyper(p, stat.ino);
2663 }
2664 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2665 p = xdr_reserve_space(xdr, 8);
2666 if (!p)
2667 goto out_resource;
2668 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2669 }
2670 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2671 p = xdr_reserve_space(xdr, 8);
2672 if (!p)
2673 goto out_resource;
2674 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2675 }
2676 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2677 p = xdr_reserve_space(xdr, 8);
2678 if (!p)
2679 goto out_resource;
2680 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2681 }
2682 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2683 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2684 if (status)
2685 goto out;
2686 }
2687 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2688 p = xdr_reserve_space(xdr, 4);
2689 if (!p)
2690 goto out_resource;
2691 *p++ = cpu_to_be32(1);
2692 }
2693 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2694 p = xdr_reserve_space(xdr, 8);
2695 if (!p)
2696 goto out_resource;
2697 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2698 }
2699 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2700 p = xdr_reserve_space(xdr, 4);
2701 if (!p)
2702 goto out_resource;
2703 *p++ = cpu_to_be32(255);
2704 }
2705 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2706 p = xdr_reserve_space(xdr, 4);
2707 if (!p)
2708 goto out_resource;
2709 *p++ = cpu_to_be32(statfs.f_namelen);
2710 }
2711 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2712 p = xdr_reserve_space(xdr, 8);
2713 if (!p)
2714 goto out_resource;
2715 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2716 }
2717 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2718 p = xdr_reserve_space(xdr, 8);
2719 if (!p)
2720 goto out_resource;
2721 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2722 }
2723 if (bmval1 & FATTR4_WORD1_MODE) {
2724 p = xdr_reserve_space(xdr, 4);
2725 if (!p)
2726 goto out_resource;
2727 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2728 }
2729 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2730 p = xdr_reserve_space(xdr, 4);
2731 if (!p)
2732 goto out_resource;
2733 *p++ = cpu_to_be32(1);
2734 }
2735 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2736 p = xdr_reserve_space(xdr, 4);
2737 if (!p)
2738 goto out_resource;
2739 *p++ = cpu_to_be32(stat.nlink);
2740 }
2741 if (bmval1 & FATTR4_WORD1_OWNER) {
2742 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2743 if (status)
2744 goto out;
2745 }
2746 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2747 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2748 if (status)
2749 goto out;
2750 }
2751 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2752 p = xdr_reserve_space(xdr, 8);
2753 if (!p)
2754 goto out_resource;
2755 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2756 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2757 }
2758 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2759 p = xdr_reserve_space(xdr, 8);
2760 if (!p)
2761 goto out_resource;
2762 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2763 p = xdr_encode_hyper(p, dummy64);
2764 }
2765 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2766 p = xdr_reserve_space(xdr, 8);
2767 if (!p)
2768 goto out_resource;
2769 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2770 p = xdr_encode_hyper(p, dummy64);
2771 }
2772 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2773 p = xdr_reserve_space(xdr, 8);
2774 if (!p)
2775 goto out_resource;
2776 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2777 p = xdr_encode_hyper(p, dummy64);
2778 }
2779 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2780 p = xdr_reserve_space(xdr, 8);
2781 if (!p)
2782 goto out_resource;
2783 dummy64 = (u64)stat.blocks << 9;
2784 p = xdr_encode_hyper(p, dummy64);
2785 }
2786 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2787 p = xdr_reserve_space(xdr, 12);
2788 if (!p)
2789 goto out_resource;
2790 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2791 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2792 }
2793 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2794 p = xdr_reserve_space(xdr, 12);
2795 if (!p)
2796 goto out_resource;
2797 *p++ = cpu_to_be32(0);
2798 *p++ = cpu_to_be32(1);
2799 *p++ = cpu_to_be32(0);
2800 }
2801 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2802 p = xdr_reserve_space(xdr, 12);
2803 if (!p)
2804 goto out_resource;
2805 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2806 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2807 }
2808 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2809 p = xdr_reserve_space(xdr, 12);
2810 if (!p)
2811 goto out_resource;
2812 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2813 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2814 }
2815 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2816 struct kstat parent_stat;
2817 u64 ino = stat.ino;
2818
2819 p = xdr_reserve_space(xdr, 8);
2820 if (!p)
2821 goto out_resource;
2822 /*
2823 * Get parent's attributes if not ignoring crossmount
2824 * and this is the root of a cross-mounted filesystem.
2825 */
2826 if (ignore_crossmnt == 0 &&
2827 dentry == exp->ex_path.mnt->mnt_root) {
2828 err = get_parent_attributes(exp, &parent_stat);
2829 if (err)
2830 goto out_nfserr;
2831 ino = parent_stat.ino;
2832 }
2833 p = xdr_encode_hyper(p, ino);
2834 }
2835 #ifdef CONFIG_NFSD_PNFS
2836 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2837 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2838 if (status)
2839 goto out;
2840 }
2841
2842 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2843 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2844 if (status)
2845 goto out;
2846 }
2847
2848 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2849 p = xdr_reserve_space(xdr, 4);
2850 if (!p)
2851 goto out_resource;
2852 *p++ = cpu_to_be32(stat.blksize);
2853 }
2854 #endif /* CONFIG_NFSD_PNFS */
2855 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2856 u32 supp[3];
2857
2858 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2859 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2860 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2861 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2862
2863 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2864 if (status)
2865 goto out;
2866 }
2867
2868 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2869 status = nfsd4_encode_security_label(xdr, rqstp, context,
2870 contextlen);
2871 if (status)
2872 goto out;
2873 }
2874
2875 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2876 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2877 status = nfs_ok;
2878
2879 out:
2880 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2881 if (context)
2882 security_release_secctx(context, contextlen);
2883 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2884 kfree(acl);
2885 if (tempfh) {
2886 fh_put(tempfh);
2887 kfree(tempfh);
2888 }
2889 if (status)
2890 xdr_truncate_encode(xdr, starting_len);
2891 return status;
2892 out_nfserr:
2893 status = nfserrno(err);
2894 goto out;
2895 out_resource:
2896 status = nfserr_resource;
2897 goto out;
2898 }
2899
2900 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2901 struct xdr_buf *buf, __be32 *p, int bytes)
2902 {
2903 xdr->scratch.iov_len = 0;
2904 memset(buf, 0, sizeof(struct xdr_buf));
2905 buf->head[0].iov_base = p;
2906 buf->head[0].iov_len = 0;
2907 buf->len = 0;
2908 xdr->buf = buf;
2909 xdr->iov = buf->head;
2910 xdr->p = p;
2911 xdr->end = (void *)p + bytes;
2912 buf->buflen = bytes;
2913 }
2914
2915 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2916 struct svc_fh *fhp, struct svc_export *exp,
2917 struct dentry *dentry, u32 *bmval,
2918 struct svc_rqst *rqstp, int ignore_crossmnt)
2919 {
2920 struct xdr_buf dummy;
2921 struct xdr_stream xdr;
2922 __be32 ret;
2923
2924 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2925 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2926 ignore_crossmnt);
2927 *p = xdr.p;
2928 return ret;
2929 }
2930
2931 static inline int attributes_need_mount(u32 *bmval)
2932 {
2933 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2934 return 1;
2935 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2936 return 1;
2937 return 0;
2938 }
2939
2940 static __be32
2941 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2942 const char *name, int namlen)
2943 {
2944 struct svc_export *exp = cd->rd_fhp->fh_export;
2945 struct dentry *dentry;
2946 __be32 nfserr;
2947 int ignore_crossmnt = 0;
2948
2949 dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2950 if (IS_ERR(dentry))
2951 return nfserrno(PTR_ERR(dentry));
2952 if (d_really_is_negative(dentry)) {
2953 /*
2954 * we're not holding the i_mutex here, so there's
2955 * a window where this directory entry could have gone
2956 * away.
2957 */
2958 dput(dentry);
2959 return nfserr_noent;
2960 }
2961
2962 exp_get(exp);
2963 /*
2964 * In the case of a mountpoint, the client may be asking for
2965 * attributes that are only properties of the underlying filesystem
2966 * as opposed to the cross-mounted file system. In such a case,
2967 * we will not follow the cross mount and will fill the attribtutes
2968 * directly from the mountpoint dentry.
2969 */
2970 if (nfsd_mountpoint(dentry, exp)) {
2971 int err;
2972
2973 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2974 && !attributes_need_mount(cd->rd_bmval)) {
2975 ignore_crossmnt = 1;
2976 goto out_encode;
2977 }
2978 /*
2979 * Why the heck aren't we just using nfsd_lookup??
2980 * Different "."/".." handling? Something else?
2981 * At least, add a comment here to explain....
2982 */
2983 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2984 if (err) {
2985 nfserr = nfserrno(err);
2986 goto out_put;
2987 }
2988 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2989 if (nfserr)
2990 goto out_put;
2991
2992 }
2993 out_encode:
2994 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2995 cd->rd_rqstp, ignore_crossmnt);
2996 out_put:
2997 dput(dentry);
2998 exp_put(exp);
2999 return nfserr;
3000 }
3001
3002 static __be32 *
3003 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3004 {
3005 __be32 *p;
3006
3007 p = xdr_reserve_space(xdr, 20);
3008 if (!p)
3009 return NULL;
3010 *p++ = htonl(2);
3011 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3012 *p++ = htonl(0); /* bmval1 */
3013
3014 *p++ = htonl(4); /* attribute length */
3015 *p++ = nfserr; /* no htonl */
3016 return p;
3017 }
3018
3019 static int
3020 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3021 loff_t offset, u64 ino, unsigned int d_type)
3022 {
3023 struct readdir_cd *ccd = ccdv;
3024 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3025 struct xdr_stream *xdr = cd->xdr;
3026 int start_offset = xdr->buf->len;
3027 int cookie_offset;
3028 u32 name_and_cookie;
3029 int entry_bytes;
3030 __be32 nfserr = nfserr_toosmall;
3031 __be64 wire_offset;
3032 __be32 *p;
3033
3034 /* In nfsv4, "." and ".." never make it onto the wire.. */
3035 if (name && isdotent(name, namlen)) {
3036 cd->common.err = nfs_ok;
3037 return 0;
3038 }
3039
3040 if (cd->cookie_offset) {
3041 wire_offset = cpu_to_be64(offset);
3042 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3043 &wire_offset, 8);
3044 }
3045
3046 p = xdr_reserve_space(xdr, 4);
3047 if (!p)
3048 goto fail;
3049 *p++ = xdr_one; /* mark entry present */
3050 cookie_offset = xdr->buf->len;
3051 p = xdr_reserve_space(xdr, 3*4 + namlen);
3052 if (!p)
3053 goto fail;
3054 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
3055 p = xdr_encode_array(p, name, namlen); /* name length & name */
3056
3057 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3058 switch (nfserr) {
3059 case nfs_ok:
3060 break;
3061 case nfserr_resource:
3062 nfserr = nfserr_toosmall;
3063 goto fail;
3064 case nfserr_noent:
3065 xdr_truncate_encode(xdr, start_offset);
3066 goto skip_entry;
3067 default:
3068 /*
3069 * If the client requested the RDATTR_ERROR attribute,
3070 * we stuff the error code into this attribute
3071 * and continue. If this attribute was not requested,
3072 * then in accordance with the spec, we fail the
3073 * entire READDIR operation(!)
3074 */
3075 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3076 goto fail;
3077 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3078 if (p == NULL) {
3079 nfserr = nfserr_toosmall;
3080 goto fail;
3081 }
3082 }
3083 nfserr = nfserr_toosmall;
3084 entry_bytes = xdr->buf->len - start_offset;
3085 if (entry_bytes > cd->rd_maxcount)
3086 goto fail;
3087 cd->rd_maxcount -= entry_bytes;
3088 /*
3089 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3090 * let's always let through the first entry, at least:
3091 */
3092 if (!cd->rd_dircount)
3093 goto fail;
3094 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3095 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3096 goto fail;
3097 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3098
3099 cd->cookie_offset = cookie_offset;
3100 skip_entry:
3101 cd->common.err = nfs_ok;
3102 return 0;
3103 fail:
3104 xdr_truncate_encode(xdr, start_offset);
3105 cd->common.err = nfserr;
3106 return -EINVAL;
3107 }
3108
3109 static __be32
3110 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3111 {
3112 __be32 *p;
3113
3114 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3115 if (!p)
3116 return nfserr_resource;
3117 *p++ = cpu_to_be32(sid->si_generation);
3118 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3119 sizeof(stateid_opaque_t));
3120 return 0;
3121 }
3122
3123 static __be32
3124 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3125 {
3126 struct xdr_stream *xdr = &resp->xdr;
3127 __be32 *p;
3128
3129 p = xdr_reserve_space(xdr, 8);
3130 if (!p)
3131 return nfserr_resource;
3132 *p++ = cpu_to_be32(access->ac_supported);
3133 *p++ = cpu_to_be32(access->ac_resp_access);
3134 return 0;
3135 }
3136
3137 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3138 {
3139 struct xdr_stream *xdr = &resp->xdr;
3140 __be32 *p;
3141
3142 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3143 if (!p)
3144 return nfserr_resource;
3145 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3146 NFS4_MAX_SESSIONID_LEN);
3147 *p++ = cpu_to_be32(bcts->dir);
3148 /* Upshifting from TCP to RDMA is not supported */
3149 *p++ = cpu_to_be32(0);
3150 return 0;
3151 }
3152
3153 static __be32
3154 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3155 {
3156 struct xdr_stream *xdr = &resp->xdr;
3157
3158 return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3159 }
3160
3161
3162 static __be32
3163 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3164 {
3165 struct xdr_stream *xdr = &resp->xdr;
3166 __be32 *p;
3167
3168 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3169 if (!p)
3170 return nfserr_resource;
3171 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3172 NFS4_VERIFIER_SIZE);
3173 return 0;
3174 }
3175
3176 static __be32
3177 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3178 {
3179 struct xdr_stream *xdr = &resp->xdr;
3180 __be32 *p;
3181
3182 p = xdr_reserve_space(xdr, 20);
3183 if (!p)
3184 return nfserr_resource;
3185 encode_cinfo(p, &create->cr_cinfo);
3186 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3187 create->cr_bmval[1], create->cr_bmval[2]);
3188 return 0;
3189 }
3190
3191 static __be32
3192 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3193 {
3194 struct svc_fh *fhp = getattr->ga_fhp;
3195 struct xdr_stream *xdr = &resp->xdr;
3196
3197 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3198 getattr->ga_bmval, resp->rqstp, 0);
3199 }
3200
3201 static __be32
3202 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3203 {
3204 struct xdr_stream *xdr = &resp->xdr;
3205 struct svc_fh *fhp = *fhpp;
3206 unsigned int len;
3207 __be32 *p;
3208
3209 len = fhp->fh_handle.fh_size;
3210 p = xdr_reserve_space(xdr, len + 4);
3211 if (!p)
3212 return nfserr_resource;
3213 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3214 return 0;
3215 }
3216
3217 /*
3218 * Including all fields other than the name, a LOCK4denied structure requires
3219 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3220 */
3221 static __be32
3222 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3223 {
3224 struct xdr_netobj *conf = &ld->ld_owner;
3225 __be32 *p;
3226
3227 again:
3228 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3229 if (!p) {
3230 /*
3231 * Don't fail to return the result just because we can't
3232 * return the conflicting open:
3233 */
3234 if (conf->len) {
3235 kfree(conf->data);
3236 conf->len = 0;
3237 conf->data = NULL;
3238 goto again;
3239 }
3240 return nfserr_resource;
3241 }
3242 p = xdr_encode_hyper(p, ld->ld_start);
3243 p = xdr_encode_hyper(p, ld->ld_length);
3244 *p++ = cpu_to_be32(ld->ld_type);
3245 if (conf->len) {
3246 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3247 p = xdr_encode_opaque(p, conf->data, conf->len);
3248 kfree(conf->data);
3249 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
3250 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3251 *p++ = cpu_to_be32(0); /* length of owner name */
3252 }
3253 return nfserr_denied;
3254 }
3255
3256 static __be32
3257 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3258 {
3259 struct xdr_stream *xdr = &resp->xdr;
3260
3261 if (!nfserr)
3262 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3263 else if (nfserr == nfserr_denied)
3264 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3265
3266 return nfserr;
3267 }
3268
3269 static __be32
3270 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3271 {
3272 struct xdr_stream *xdr = &resp->xdr;
3273
3274 if (nfserr == nfserr_denied)
3275 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3276 return nfserr;
3277 }
3278
3279 static __be32
3280 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3281 {
3282 struct xdr_stream *xdr = &resp->xdr;
3283
3284 return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3285 }
3286
3287
3288 static __be32
3289 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3290 {
3291 struct xdr_stream *xdr = &resp->xdr;
3292 __be32 *p;
3293
3294 p = xdr_reserve_space(xdr, 20);
3295 if (!p)
3296 return nfserr_resource;
3297 p = encode_cinfo(p, &link->li_cinfo);
3298 return 0;
3299 }
3300
3301
3302 static __be32
3303 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3304 {
3305 struct xdr_stream *xdr = &resp->xdr;
3306 __be32 *p;
3307
3308 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3309 if (nfserr)
3310 return nfserr;
3311 p = xdr_reserve_space(xdr, 24);
3312 if (!p)
3313 return nfserr_resource;
3314 p = encode_cinfo(p, &open->op_cinfo);
3315 *p++ = cpu_to_be32(open->op_rflags);
3316
3317 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3318 open->op_bmval[2]);
3319 if (nfserr)
3320 return nfserr;
3321
3322 p = xdr_reserve_space(xdr, 4);
3323 if (!p)
3324 return nfserr_resource;
3325
3326 *p++ = cpu_to_be32(open->op_delegate_type);
3327 switch (open->op_delegate_type) {
3328 case NFS4_OPEN_DELEGATE_NONE:
3329 break;
3330 case NFS4_OPEN_DELEGATE_READ:
3331 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3332 if (nfserr)
3333 return nfserr;
3334 p = xdr_reserve_space(xdr, 20);
3335 if (!p)
3336 return nfserr_resource;
3337 *p++ = cpu_to_be32(open->op_recall);
3338
3339 /*
3340 * TODO: ACE's in delegations
3341 */
3342 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3343 *p++ = cpu_to_be32(0);
3344 *p++ = cpu_to_be32(0);
3345 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3346 break;
3347 case NFS4_OPEN_DELEGATE_WRITE:
3348 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3349 if (nfserr)
3350 return nfserr;
3351 p = xdr_reserve_space(xdr, 32);
3352 if (!p)
3353 return nfserr_resource;
3354 *p++ = cpu_to_be32(0);
3355
3356 /*
3357 * TODO: space_limit's in delegations
3358 */
3359 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3360 *p++ = cpu_to_be32(~(u32)0);
3361 *p++ = cpu_to_be32(~(u32)0);
3362
3363 /*
3364 * TODO: ACE's in delegations
3365 */
3366 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3367 *p++ = cpu_to_be32(0);
3368 *p++ = cpu_to_be32(0);
3369 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3370 break;
3371 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3372 switch (open->op_why_no_deleg) {
3373 case WND4_CONTENTION:
3374 case WND4_RESOURCE:
3375 p = xdr_reserve_space(xdr, 8);
3376 if (!p)
3377 return nfserr_resource;
3378 *p++ = cpu_to_be32(open->op_why_no_deleg);
3379 /* deleg signaling not supported yet: */
3380 *p++ = cpu_to_be32(0);
3381 break;
3382 default:
3383 p = xdr_reserve_space(xdr, 4);
3384 if (!p)
3385 return nfserr_resource;
3386 *p++ = cpu_to_be32(open->op_why_no_deleg);
3387 }
3388 break;
3389 default:
3390 BUG();
3391 }
3392 /* XXX save filehandle here */
3393 return 0;
3394 }
3395
3396 static __be32
3397 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3398 {
3399 struct xdr_stream *xdr = &resp->xdr;
3400
3401 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3402 }
3403
3404 static __be32
3405 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3406 {
3407 struct xdr_stream *xdr = &resp->xdr;
3408
3409 return nfsd4_encode_stateid(xdr, &od->od_stateid);
3410 }
3411
3412 static __be32 nfsd4_encode_splice_read(
3413 struct nfsd4_compoundres *resp,
3414 struct nfsd4_read *read,
3415 struct file *file, unsigned long maxcount)
3416 {
3417 struct xdr_stream *xdr = &resp->xdr;
3418 struct xdr_buf *buf = xdr->buf;
3419 u32 eof;
3420 long len;
3421 int space_left;
3422 __be32 nfserr;
3423 __be32 *p = xdr->p - 2;
3424
3425 /* Make sure there will be room for padding if needed */
3426 if (xdr->end - xdr->p < 1)
3427 return nfserr_resource;
3428
3429 len = maxcount;
3430 nfserr = nfsd_splice_read(read->rd_rqstp, file,
3431 read->rd_offset, &maxcount);
3432 if (nfserr) {
3433 /*
3434 * nfsd_splice_actor may have already messed with the
3435 * page length; reset it so as not to confuse
3436 * xdr_truncate_encode:
3437 */
3438 buf->page_len = 0;
3439 return nfserr;
3440 }
3441
3442 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3443 d_inode(read->rd_fhp->fh_dentry)->i_size);
3444
3445 *(p++) = htonl(eof);
3446 *(p++) = htonl(maxcount);
3447
3448 buf->page_len = maxcount;
3449 buf->len += maxcount;
3450 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3451 / PAGE_SIZE;
3452
3453 /* Use rest of head for padding and remaining ops: */
3454 buf->tail[0].iov_base = xdr->p;
3455 buf->tail[0].iov_len = 0;
3456 xdr->iov = buf->tail;
3457 if (maxcount&3) {
3458 int pad = 4 - (maxcount&3);
3459
3460 *(xdr->p++) = 0;
3461
3462 buf->tail[0].iov_base += maxcount&3;
3463 buf->tail[0].iov_len = pad;
3464 buf->len += pad;
3465 }
3466
3467 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3468 buf->buflen - buf->len);
3469 buf->buflen = buf->len + space_left;
3470 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3471
3472 return 0;
3473 }
3474
3475 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3476 struct nfsd4_read *read,
3477 struct file *file, unsigned long maxcount)
3478 {
3479 struct xdr_stream *xdr = &resp->xdr;
3480 u32 eof;
3481 int v;
3482 int starting_len = xdr->buf->len - 8;
3483 long len;
3484 int thislen;
3485 __be32 nfserr;
3486 __be32 tmp;
3487 __be32 *p;
3488 u32 zzz = 0;
3489 int pad;
3490
3491 len = maxcount;
3492 v = 0;
3493
3494 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3495 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3496 WARN_ON_ONCE(!p);
3497 resp->rqstp->rq_vec[v].iov_base = p;
3498 resp->rqstp->rq_vec[v].iov_len = thislen;
3499 v++;
3500 len -= thislen;
3501
3502 while (len) {
3503 thislen = min_t(long, len, PAGE_SIZE);
3504 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3505 WARN_ON_ONCE(!p);
3506 resp->rqstp->rq_vec[v].iov_base = p;
3507 resp->rqstp->rq_vec[v].iov_len = thislen;
3508 v++;
3509 len -= thislen;
3510 }
3511 read->rd_vlen = v;
3512
3513 len = maxcount;
3514 nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3515 read->rd_vlen, &maxcount);
3516 if (nfserr)
3517 return nfserr;
3518 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3519
3520 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3521 d_inode(read->rd_fhp->fh_dentry)->i_size);
3522
3523 tmp = htonl(eof);
3524 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3525 tmp = htonl(maxcount);
3526 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3527
3528 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3529 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3530 &zzz, pad);
3531 return 0;
3532
3533 }
3534
3535 static __be32
3536 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3537 struct nfsd4_read *read)
3538 {
3539 unsigned long maxcount;
3540 struct xdr_stream *xdr = &resp->xdr;
3541 struct file *file = read->rd_filp;
3542 int starting_len = xdr->buf->len;
3543 struct raparms *ra = NULL;
3544 __be32 *p;
3545
3546 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3547 if (!p) {
3548 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3549 return nfserr_resource;
3550 }
3551 if (resp->xdr.buf->page_len &&
3552 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3553 WARN_ON_ONCE(1);
3554 return nfserr_resource;
3555 }
3556 xdr_commit_encode(xdr);
3557
3558 maxcount = svc_max_payload(resp->rqstp);
3559 maxcount = min_t(unsigned long, maxcount,
3560 (xdr->buf->buflen - xdr->buf->len));
3561 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3562
3563 if (read->rd_tmp_file)
3564 ra = nfsd_init_raparms(file);
3565
3566 if (file->f_op->splice_read &&
3567 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3568 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3569 else
3570 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3571
3572 if (ra)
3573 nfsd_put_raparams(file, ra);
3574
3575 if (nfserr)
3576 xdr_truncate_encode(xdr, starting_len);
3577
3578 return nfserr;
3579 }
3580
3581 static __be32
3582 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3583 {
3584 int maxcount;
3585 __be32 wire_count;
3586 int zero = 0;
3587 struct xdr_stream *xdr = &resp->xdr;
3588 int length_offset = xdr->buf->len;
3589 __be32 *p;
3590
3591 p = xdr_reserve_space(xdr, 4);
3592 if (!p)
3593 return nfserr_resource;
3594 maxcount = PAGE_SIZE;
3595
3596 p = xdr_reserve_space(xdr, maxcount);
3597 if (!p)
3598 return nfserr_resource;
3599 /*
3600 * XXX: By default, vfs_readlink() will truncate symlinks if they
3601 * would overflow the buffer. Is this kosher in NFSv4? If not, one
3602 * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3603 * that truncation occurred, and return NFS4ERR_RESOURCE.
3604 */
3605 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3606 (char *)p, &maxcount);
3607 if (nfserr == nfserr_isdir)
3608 nfserr = nfserr_inval;
3609 if (nfserr) {
3610 xdr_truncate_encode(xdr, length_offset);
3611 return nfserr;
3612 }
3613
3614 wire_count = htonl(maxcount);
3615 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3616 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3617 if (maxcount & 3)
3618 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3619 &zero, 4 - (maxcount&3));
3620 return 0;
3621 }
3622
3623 static __be32
3624 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3625 {
3626 int maxcount;
3627 int bytes_left;
3628 loff_t offset;
3629 __be64 wire_offset;
3630 struct xdr_stream *xdr = &resp->xdr;
3631 int starting_len = xdr->buf->len;
3632 __be32 *p;
3633
3634 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3635 if (!p)
3636 return nfserr_resource;
3637
3638 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3639 *p++ = cpu_to_be32(0);
3640 *p++ = cpu_to_be32(0);
3641 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3642 - (char *)resp->xdr.buf->head[0].iov_base;
3643
3644 /*
3645 * Number of bytes left for directory entries allowing for the
3646 * final 8 bytes of the readdir and a following failed op:
3647 */
3648 bytes_left = xdr->buf->buflen - xdr->buf->len
3649 - COMPOUND_ERR_SLACK_SPACE - 8;
3650 if (bytes_left < 0) {
3651 nfserr = nfserr_resource;
3652 goto err_no_verf;
3653 }
3654 maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3655 /*
3656 * Note the rfc defines rd_maxcount as the size of the
3657 * READDIR4resok structure, which includes the verifier above
3658 * and the 8 bytes encoded at the end of this function:
3659 */
3660 if (maxcount < 16) {
3661 nfserr = nfserr_toosmall;
3662 goto err_no_verf;
3663 }
3664 maxcount = min_t(int, maxcount-16, bytes_left);
3665
3666 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3667 if (!readdir->rd_dircount)
3668 readdir->rd_dircount = INT_MAX;
3669
3670 readdir->xdr = xdr;
3671 readdir->rd_maxcount = maxcount;
3672 readdir->common.err = 0;
3673 readdir->cookie_offset = 0;
3674
3675 offset = readdir->rd_cookie;
3676 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3677 &offset,
3678 &readdir->common, nfsd4_encode_dirent);
3679 if (nfserr == nfs_ok &&
3680 readdir->common.err == nfserr_toosmall &&
3681 xdr->buf->len == starting_len + 8) {
3682 /* nothing encoded; which limit did we hit?: */
3683 if (maxcount - 16 < bytes_left)
3684 /* It was the fault of rd_maxcount: */
3685 nfserr = nfserr_toosmall;
3686 else
3687 /* We ran out of buffer space: */
3688 nfserr = nfserr_resource;
3689 }
3690 if (nfserr)
3691 goto err_no_verf;
3692
3693 if (readdir->cookie_offset) {
3694 wire_offset = cpu_to_be64(offset);
3695 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3696 &wire_offset, 8);
3697 }
3698
3699 p = xdr_reserve_space(xdr, 8);
3700 if (!p) {
3701 WARN_ON_ONCE(1);
3702 goto err_no_verf;
3703 }
3704 *p++ = 0; /* no more entries */
3705 *p++ = htonl(readdir->common.err == nfserr_eof);
3706
3707 return 0;
3708 err_no_verf:
3709 xdr_truncate_encode(xdr, starting_len);
3710 return nfserr;
3711 }
3712
3713 static __be32
3714 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3715 {
3716 struct xdr_stream *xdr = &resp->xdr;
3717 __be32 *p;
3718
3719 p = xdr_reserve_space(xdr, 20);
3720 if (!p)
3721 return nfserr_resource;
3722 p = encode_cinfo(p, &remove->rm_cinfo);
3723 return 0;
3724 }
3725
3726 static __be32
3727 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3728 {
3729 struct xdr_stream *xdr = &resp->xdr;
3730 __be32 *p;
3731
3732 p = xdr_reserve_space(xdr, 40);
3733 if (!p)
3734 return nfserr_resource;
3735 p = encode_cinfo(p, &rename->rn_sinfo);
3736 p = encode_cinfo(p, &rename->rn_tinfo);
3737 return 0;
3738 }
3739
3740 static __be32
3741 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
3742 {
3743 u32 i, nflavs, supported;
3744 struct exp_flavor_info *flavs;
3745 struct exp_flavor_info def_flavs[2];
3746 __be32 *p, *flavorsp;
3747 static bool report = true;
3748
3749 if (exp->ex_nflavors) {
3750 flavs = exp->ex_flavors;
3751 nflavs = exp->ex_nflavors;
3752 } else { /* Handling of some defaults in absence of real secinfo: */
3753 flavs = def_flavs;
3754 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3755 nflavs = 2;
3756 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3757 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3758 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3759 nflavs = 1;
3760 flavs[0].pseudoflavor
3761 = svcauth_gss_flavor(exp->ex_client);
3762 } else {
3763 nflavs = 1;
3764 flavs[0].pseudoflavor
3765 = exp->ex_client->flavour->flavour;
3766 }
3767 }
3768
3769 supported = 0;
3770 p = xdr_reserve_space(xdr, 4);
3771 if (!p)
3772 return nfserr_resource;
3773 flavorsp = p++; /* to be backfilled later */
3774
3775 for (i = 0; i < nflavs; i++) {
3776 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3777 struct rpcsec_gss_info info;
3778
3779 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3780 supported++;
3781 p = xdr_reserve_space(xdr, 4 + 4 +
3782 XDR_LEN(info.oid.len) + 4 + 4);
3783 if (!p)
3784 return nfserr_resource;
3785 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3786 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3787 *p++ = cpu_to_be32(info.qop);
3788 *p++ = cpu_to_be32(info.service);
3789 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3790 supported++;
3791 p = xdr_reserve_space(xdr, 4);
3792 if (!p)
3793 return nfserr_resource;
3794 *p++ = cpu_to_be32(pf);
3795 } else {
3796 if (report)
3797 pr_warn("NFS: SECINFO: security flavor %u "
3798 "is not supported\n", pf);
3799 }
3800 }
3801
3802 if (nflavs != supported)
3803 report = false;
3804 *flavorsp = htonl(supported);
3805 return 0;
3806 }
3807
3808 static __be32
3809 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3810 struct nfsd4_secinfo *secinfo)
3811 {
3812 struct xdr_stream *xdr = &resp->xdr;
3813
3814 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
3815 }
3816
3817 static __be32
3818 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3819 struct nfsd4_secinfo_no_name *secinfo)
3820 {
3821 struct xdr_stream *xdr = &resp->xdr;
3822
3823 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
3824 }
3825
3826 /*
3827 * The SETATTR encode routine is special -- it always encodes a bitmap,
3828 * regardless of the error status.
3829 */
3830 static __be32
3831 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3832 {
3833 struct xdr_stream *xdr = &resp->xdr;
3834 __be32 *p;
3835
3836 p = xdr_reserve_space(xdr, 16);
3837 if (!p)
3838 return nfserr_resource;
3839 if (nfserr) {
3840 *p++ = cpu_to_be32(3);
3841 *p++ = cpu_to_be32(0);
3842 *p++ = cpu_to_be32(0);
3843 *p++ = cpu_to_be32(0);
3844 }
3845 else {
3846 *p++ = cpu_to_be32(3);
3847 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3848 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3849 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3850 }
3851 return nfserr;
3852 }
3853
3854 static __be32
3855 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3856 {
3857 struct xdr_stream *xdr = &resp->xdr;
3858 __be32 *p;
3859
3860 if (!nfserr) {
3861 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3862 if (!p)
3863 return nfserr_resource;
3864 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3865 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3866 NFS4_VERIFIER_SIZE);
3867 }
3868 else if (nfserr == nfserr_clid_inuse) {
3869 p = xdr_reserve_space(xdr, 8);
3870 if (!p)
3871 return nfserr_resource;
3872 *p++ = cpu_to_be32(0);
3873 *p++ = cpu_to_be32(0);
3874 }
3875 return nfserr;
3876 }
3877
3878 static __be32
3879 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3880 {
3881 struct xdr_stream *xdr = &resp->xdr;
3882 __be32 *p;
3883
3884 p = xdr_reserve_space(xdr, 16);
3885 if (!p)
3886 return nfserr_resource;
3887 *p++ = cpu_to_be32(write->wr_bytes_written);
3888 *p++ = cpu_to_be32(write->wr_how_written);
3889 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3890 NFS4_VERIFIER_SIZE);
3891 return 0;
3892 }
3893
3894 static __be32
3895 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3896 struct nfsd4_exchange_id *exid)
3897 {
3898 struct xdr_stream *xdr = &resp->xdr;
3899 __be32 *p;
3900 char *major_id;
3901 char *server_scope;
3902 int major_id_sz;
3903 int server_scope_sz;
3904 uint64_t minor_id = 0;
3905
3906 major_id = utsname()->nodename;
3907 major_id_sz = strlen(major_id);
3908 server_scope = utsname()->nodename;
3909 server_scope_sz = strlen(server_scope);
3910
3911 p = xdr_reserve_space(xdr,
3912 8 /* eir_clientid */ +
3913 4 /* eir_sequenceid */ +
3914 4 /* eir_flags */ +
3915 4 /* spr_how */);
3916 if (!p)
3917 return nfserr_resource;
3918
3919 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3920 *p++ = cpu_to_be32(exid->seqid);
3921 *p++ = cpu_to_be32(exid->flags);
3922
3923 *p++ = cpu_to_be32(exid->spa_how);
3924
3925 switch (exid->spa_how) {
3926 case SP4_NONE:
3927 break;
3928 case SP4_MACH_CRED:
3929 /* spo_must_enforce bitmap: */
3930 nfserr = nfsd4_encode_bitmap(xdr,
3931 exid->spo_must_enforce[0],
3932 exid->spo_must_enforce[1],
3933 exid->spo_must_enforce[2]);
3934 if (nfserr)
3935 return nfserr;
3936 /* spo_must_allow bitmap: */
3937 nfserr = nfsd4_encode_bitmap(xdr,
3938 exid->spo_must_allow[0],
3939 exid->spo_must_allow[1],
3940 exid->spo_must_allow[2]);
3941 if (nfserr)
3942 return nfserr;
3943 break;
3944 default:
3945 WARN_ON_ONCE(1);
3946 }
3947
3948 p = xdr_reserve_space(xdr,
3949 8 /* so_minor_id */ +
3950 4 /* so_major_id.len */ +
3951 (XDR_QUADLEN(major_id_sz) * 4) +
3952 4 /* eir_server_scope.len */ +
3953 (XDR_QUADLEN(server_scope_sz) * 4) +
3954 4 /* eir_server_impl_id.count (0) */);
3955 if (!p)
3956 return nfserr_resource;
3957
3958 /* The server_owner struct */
3959 p = xdr_encode_hyper(p, minor_id); /* Minor id */
3960 /* major id */
3961 p = xdr_encode_opaque(p, major_id, major_id_sz);
3962
3963 /* Server scope */
3964 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3965
3966 /* Implementation id */
3967 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
3968 return 0;
3969 }
3970
3971 static __be32
3972 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3973 struct nfsd4_create_session *sess)
3974 {
3975 struct xdr_stream *xdr = &resp->xdr;
3976 __be32 *p;
3977
3978 p = xdr_reserve_space(xdr, 24);
3979 if (!p)
3980 return nfserr_resource;
3981 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3982 NFS4_MAX_SESSIONID_LEN);
3983 *p++ = cpu_to_be32(sess->seqid);
3984 *p++ = cpu_to_be32(sess->flags);
3985
3986 p = xdr_reserve_space(xdr, 28);
3987 if (!p)
3988 return nfserr_resource;
3989 *p++ = cpu_to_be32(0); /* headerpadsz */
3990 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3991 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3992 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3993 *p++ = cpu_to_be32(sess->fore_channel.maxops);
3994 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3995 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3996
3997 if (sess->fore_channel.nr_rdma_attrs) {
3998 p = xdr_reserve_space(xdr, 4);
3999 if (!p)
4000 return nfserr_resource;
4001 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4002 }
4003
4004 p = xdr_reserve_space(xdr, 28);
4005 if (!p)
4006 return nfserr_resource;
4007 *p++ = cpu_to_be32(0); /* headerpadsz */
4008 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4009 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4010 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4011 *p++ = cpu_to_be32(sess->back_channel.maxops);
4012 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4013 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4014
4015 if (sess->back_channel.nr_rdma_attrs) {
4016 p = xdr_reserve_space(xdr, 4);
4017 if (!p)
4018 return nfserr_resource;
4019 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4020 }
4021 return 0;
4022 }
4023
4024 static __be32
4025 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4026 struct nfsd4_sequence *seq)
4027 {
4028 struct xdr_stream *xdr = &resp->xdr;
4029 __be32 *p;
4030
4031 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4032 if (!p)
4033 return nfserr_resource;
4034 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4035 NFS4_MAX_SESSIONID_LEN);
4036 *p++ = cpu_to_be32(seq->seqid);
4037 *p++ = cpu_to_be32(seq->slotid);
4038 /* Note slotid's are numbered from zero: */
4039 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4040 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4041 *p++ = cpu_to_be32(seq->status_flags);
4042
4043 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4044 return 0;
4045 }
4046
4047 static __be32
4048 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4049 struct nfsd4_test_stateid *test_stateid)
4050 {
4051 struct xdr_stream *xdr = &resp->xdr;
4052 struct nfsd4_test_stateid_id *stateid, *next;
4053 __be32 *p;
4054
4055 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4056 if (!p)
4057 return nfserr_resource;
4058 *p++ = htonl(test_stateid->ts_num_ids);
4059
4060 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4061 *p++ = stateid->ts_id_status;
4062 }
4063
4064 return 0;
4065 }
4066
4067 #ifdef CONFIG_NFSD_PNFS
4068 static __be32
4069 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4070 struct nfsd4_getdeviceinfo *gdev)
4071 {
4072 struct xdr_stream *xdr = &resp->xdr;
4073 const struct nfsd4_layout_ops *ops;
4074 u32 starting_len = xdr->buf->len, needed_len;
4075 __be32 *p;
4076
4077 p = xdr_reserve_space(xdr, 4);
4078 if (!p)
4079 return nfserr_resource;
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 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4086 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4087 if (nfserr) {
4088 /*
4089 * We don't bother to burden the layout drivers with
4090 * enforcing gd_maxcount, just tell the client to
4091 * come back with a bigger buffer if it's not enough.
4092 */
4093 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4094 goto toosmall;
4095 return nfserr;
4096 }
4097 }
4098
4099 if (gdev->gd_notify_types) {
4100 p = xdr_reserve_space(xdr, 4 + 4);
4101 if (!p)
4102 return nfserr_resource;
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 return nfserr_resource;
4109 *p++ = 0;
4110 }
4111
4112 return 0;
4113 toosmall:
4114 dprintk("%s: maxcount too small\n", __func__);
4115 needed_len = xdr->buf->len + 4 /* notifications */;
4116 xdr_truncate_encode(xdr, starting_len);
4117 p = xdr_reserve_space(xdr, 4);
4118 if (!p)
4119 return nfserr_resource;
4120 *p++ = cpu_to_be32(needed_len);
4121 return nfserr_toosmall;
4122 }
4123
4124 static __be32
4125 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4126 struct nfsd4_layoutget *lgp)
4127 {
4128 struct xdr_stream *xdr = &resp->xdr;
4129 const struct nfsd4_layout_ops *ops;
4130 __be32 *p;
4131
4132 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4133 if (!p)
4134 return nfserr_resource;
4135
4136 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4137 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4138 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4139 sizeof(stateid_opaque_t));
4140
4141 *p++ = cpu_to_be32(1); /* we always return a single layout */
4142 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4143 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4144 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4145 *p++ = cpu_to_be32(lgp->lg_layout_type);
4146
4147 ops = nfsd4_layout_ops[lgp->lg_layout_type];
4148 return ops->encode_layoutget(xdr, lgp);
4149 }
4150
4151 static __be32
4152 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4153 struct nfsd4_layoutcommit *lcp)
4154 {
4155 struct xdr_stream *xdr = &resp->xdr;
4156 __be32 *p;
4157
4158 p = xdr_reserve_space(xdr, 4);
4159 if (!p)
4160 return nfserr_resource;
4161 *p++ = cpu_to_be32(lcp->lc_size_chg);
4162 if (lcp->lc_size_chg) {
4163 p = xdr_reserve_space(xdr, 8);
4164 if (!p)
4165 return nfserr_resource;
4166 p = xdr_encode_hyper(p, lcp->lc_newsize);
4167 }
4168
4169 return 0;
4170 }
4171
4172 static __be32
4173 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4174 struct nfsd4_layoutreturn *lrp)
4175 {
4176 struct xdr_stream *xdr = &resp->xdr;
4177 __be32 *p;
4178
4179 p = xdr_reserve_space(xdr, 4);
4180 if (!p)
4181 return nfserr_resource;
4182 *p++ = cpu_to_be32(lrp->lrs_present);
4183 if (lrp->lrs_present)
4184 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4185 return 0;
4186 }
4187 #endif /* CONFIG_NFSD_PNFS */
4188
4189 static __be32
4190 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4191 {
4192 __be32 *p;
4193
4194 p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4195 if (!p)
4196 return nfserr_resource;
4197
4198 *p++ = cpu_to_be32(0);
4199 p = xdr_encode_hyper(p, write->wr_bytes_written);
4200 *p++ = cpu_to_be32(write->wr_stable_how);
4201 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4202 NFS4_VERIFIER_SIZE);
4203 return nfs_ok;
4204 }
4205
4206 static __be32
4207 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4208 struct nfsd4_copy *copy)
4209 {
4210 __be32 *p;
4211
4212 nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
4213 if (nfserr)
4214 return nfserr;
4215
4216 p = xdr_reserve_space(&resp->xdr, 4 + 4);
4217 *p++ = cpu_to_be32(copy->cp_consecutive);
4218 *p++ = cpu_to_be32(copy->cp_synchronous);
4219 return 0;
4220 }
4221
4222 static __be32
4223 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4224 struct nfsd4_seek *seek)
4225 {
4226 __be32 *p;
4227
4228 p = xdr_reserve_space(&resp->xdr, 4 + 8);
4229 *p++ = cpu_to_be32(seek->seek_eof);
4230 p = xdr_encode_hyper(p, seek->seek_pos);
4231
4232 return 0;
4233 }
4234
4235 static __be32
4236 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4237 {
4238 return nfserr;
4239 }
4240
4241 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4242
4243 /*
4244 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4245 * since we don't need to filter out obsolete ops as this is
4246 * done in the decoding phase.
4247 */
4248 static const nfsd4_enc nfsd4_enc_ops[] = {
4249 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
4250 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
4251 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
4252 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
4253 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
4254 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4255 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
4256 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
4257 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
4258 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
4259 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
4260 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
4261 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
4262 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
4263 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4264 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
4265 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
4266 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
4267 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
4268 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
4269 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
4270 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
4271 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
4272 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
4273 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
4274 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
4275 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
4276 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
4277 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
4278 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
4279 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
4280 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
4281 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
4282 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4283 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4284 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
4285 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
4286
4287 /* NFSv4.1 operations */
4288 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
4289 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4290 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
4291 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
4292 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
4293 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
4294 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4295 #ifdef CONFIG_NFSD_PNFS
4296 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4297 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4298 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit,
4299 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget,
4300 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn,
4301 #else
4302 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
4303 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4304 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
4305 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
4306 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4307 #endif
4308 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4309 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
4310 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
4311 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
4312 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4313 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
4314 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
4315
4316 /* NFSv4.2 operations */
4317 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4318 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy,
4319 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
4320 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4321 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
4322 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
4323 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
4324 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
4325 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop,
4326 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
4327 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
4328 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
4329 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop,
4330 };
4331
4332 /*
4333 * Calculate whether we still have space to encode repsize bytes.
4334 * There are two considerations:
4335 * - For NFS versions >=4.1, the size of the reply must stay within
4336 * session limits
4337 * - For all NFS versions, we must stay within limited preallocated
4338 * buffer space.
4339 *
4340 * This is called before the operation is processed, so can only provide
4341 * an upper estimate. For some nonidempotent operations (such as
4342 * getattr), it's not necessarily a problem if that estimate is wrong,
4343 * as we can fail it after processing without significant side effects.
4344 */
4345 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4346 {
4347 struct xdr_buf *buf = &resp->rqstp->rq_res;
4348 struct nfsd4_slot *slot = resp->cstate.slot;
4349
4350 if (buf->len + respsize <= buf->buflen)
4351 return nfs_ok;
4352 if (!nfsd4_has_session(&resp->cstate))
4353 return nfserr_resource;
4354 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4355 WARN_ON_ONCE(1);
4356 return nfserr_rep_too_big_to_cache;
4357 }
4358 return nfserr_rep_too_big;
4359 }
4360
4361 void
4362 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4363 {
4364 struct xdr_stream *xdr = &resp->xdr;
4365 struct nfs4_stateowner *so = resp->cstate.replay_owner;
4366 struct svc_rqst *rqstp = resp->rqstp;
4367 const struct nfsd4_operation *opdesc = op->opdesc;
4368 int post_err_offset;
4369 nfsd4_enc encoder;
4370 __be32 *p;
4371
4372 p = xdr_reserve_space(xdr, 8);
4373 if (!p) {
4374 WARN_ON_ONCE(1);
4375 return;
4376 }
4377 *p++ = cpu_to_be32(op->opnum);
4378 post_err_offset = xdr->buf->len;
4379
4380 if (op->opnum == OP_ILLEGAL)
4381 goto status;
4382 if (op->status && opdesc &&
4383 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
4384 goto status;
4385 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4386 !nfsd4_enc_ops[op->opnum]);
4387 encoder = nfsd4_enc_ops[op->opnum];
4388 op->status = encoder(resp, op->status, &op->u);
4389 if (opdesc && opdesc->op_release)
4390 opdesc->op_release(&op->u);
4391 xdr_commit_encode(xdr);
4392
4393 /* nfsd4_check_resp_size guarantees enough room for error status */
4394 if (!op->status) {
4395 int space_needed = 0;
4396 if (!nfsd4_last_compound_op(rqstp))
4397 space_needed = COMPOUND_ERR_SLACK_SPACE;
4398 op->status = nfsd4_check_resp_size(resp, space_needed);
4399 }
4400 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4401 struct nfsd4_slot *slot = resp->cstate.slot;
4402
4403 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4404 op->status = nfserr_rep_too_big_to_cache;
4405 else
4406 op->status = nfserr_rep_too_big;
4407 }
4408 if (op->status == nfserr_resource ||
4409 op->status == nfserr_rep_too_big ||
4410 op->status == nfserr_rep_too_big_to_cache) {
4411 /*
4412 * The operation may have already been encoded or
4413 * partially encoded. No op returns anything additional
4414 * in the case of one of these three errors, so we can
4415 * just truncate back to after the status. But it's a
4416 * bug if we had to do this on a non-idempotent op:
4417 */
4418 warn_on_nonidempotent_op(op);
4419 xdr_truncate_encode(xdr, post_err_offset);
4420 }
4421 if (so) {
4422 int len = xdr->buf->len - post_err_offset;
4423
4424 so->so_replay.rp_status = op->status;
4425 so->so_replay.rp_buflen = len;
4426 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4427 so->so_replay.rp_buf, len);
4428 }
4429 status:
4430 /* Note that op->status is already in network byte order: */
4431 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4432 }
4433
4434 /*
4435 * Encode the reply stored in the stateowner reply cache
4436 *
4437 * XDR note: do not encode rp->rp_buflen: the buffer contains the
4438 * previously sent already encoded operation.
4439 */
4440 void
4441 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4442 {
4443 __be32 *p;
4444 struct nfs4_replay *rp = op->replay;
4445
4446 BUG_ON(!rp);
4447
4448 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4449 if (!p) {
4450 WARN_ON_ONCE(1);
4451 return;
4452 }
4453 *p++ = cpu_to_be32(op->opnum);
4454 *p++ = rp->rp_status; /* already xdr'ed */
4455
4456 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4457 }
4458
4459 int
4460 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4461 {
4462 return xdr_ressize_check(rqstp, p);
4463 }
4464
4465 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4466 {
4467 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4468
4469 if (args->ops != args->iops) {
4470 kfree(args->ops);
4471 args->ops = args->iops;
4472 }
4473 kfree(args->tmpp);
4474 args->tmpp = NULL;
4475 while (args->to_free) {
4476 struct svcxdr_tmpbuf *tb = args->to_free;
4477 args->to_free = tb->next;
4478 kfree(tb);
4479 }
4480 }
4481
4482 int
4483 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4484 {
4485 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4486
4487 if (rqstp->rq_arg.head[0].iov_len % 4) {
4488 /* client is nuts */
4489 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4490 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4491 return 0;
4492 }
4493 args->p = p;
4494 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4495 args->pagelist = rqstp->rq_arg.pages;
4496 args->pagelen = rqstp->rq_arg.page_len;
4497 args->tail = false;
4498 args->tmpp = NULL;
4499 args->to_free = NULL;
4500 args->ops = args->iops;
4501 args->rqstp = rqstp;
4502
4503 return !nfsd4_decode_compound(args);
4504 }
4505
4506 int
4507 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4508 {
4509 /*
4510 * All that remains is to write the tag and operation count...
4511 */
4512 struct nfsd4_compoundres *resp = rqstp->rq_resp;
4513 struct xdr_buf *buf = resp->xdr.buf;
4514
4515 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4516 buf->tail[0].iov_len);
4517
4518 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4519
4520 p = resp->tagp;
4521 *p++ = htonl(resp->taglen);
4522 memcpy(p, resp->tag, resp->taglen);
4523 p += XDR_QUADLEN(resp->taglen);
4524 *p++ = htonl(resp->opcnt);
4525
4526 nfsd4_sequence_done(resp);
4527 return 1;
4528 }
4529
4530 /*
4531 * Local variables:
4532 * c-basic-offset: 8
4533 * End:
4534 */
CRIS linux kernel tree