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Merge 4.19-rc7 into tty-next
[linux/fpc-iii.git] / fs / nfsd / nfs4xdr.c
blob418fa9c78186b6b6f5d36ced347d1255ce2505fe
1 /*
2 * Server-side XDR for NFSv4
3 *
4 * Copyright (c) 2002 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <andros@umich.edu>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include <linux/file.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/statfs.h>
40 #include <linux/utsname.h>
41 #include <linux/pagemap.h>
42 #include <linux/sunrpc/svcauth_gss.h>
43
44 #include "idmap.h"
45 #include "acl.h"
46 #include "xdr4.h"
47 #include "vfs.h"
48 #include "state.h"
49 #include "cache.h"
50 #include "netns.h"
51 #include "pnfs.h"
52
53 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
54 #include <linux/security.h>
55 #endif
56
57
58 #define NFSDDBG_FACILITY NFSDDBG_XDR
59
60 const u32 nfsd_suppattrs[3][3] = {
61 {NFSD4_SUPPORTED_ATTRS_WORD0,
62 NFSD4_SUPPORTED_ATTRS_WORD1,
63 NFSD4_SUPPORTED_ATTRS_WORD2},
64
65 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
66 NFSD4_1_SUPPORTED_ATTRS_WORD1,
67 NFSD4_1_SUPPORTED_ATTRS_WORD2},
68
69 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
70 NFSD4_1_SUPPORTED_ATTRS_WORD1,
71 NFSD4_2_SUPPORTED_ATTRS_WORD2},
72 };
73
74 /*
75 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
76 * directory in order to indicate to the client that a filesystem boundary is present
77 * We use a fixed fsid for a referral
78 */
79 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
80 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
81
82 static __be32
83 check_filename(char *str, int len)
84 {
85 int i;
86
87 if (len == 0)
88 return nfserr_inval;
89 if (isdotent(str, len))
90 return nfserr_badname;
91 for (i = 0; i < len; i++)
92 if (str[i] == '/')
93 return nfserr_badname;
94 return 0;
95 }
96
97 #define DECODE_HEAD \
98 __be32 *p; \
99 __be32 status
100 #define DECODE_TAIL \
101 status = 0; \
102 out: \
103 return status; \
104 xdr_error: \
105 dprintk("NFSD: xdr error (%s:%d)\n", \
106 __FILE__, __LINE__); \
107 status = nfserr_bad_xdr; \
108 goto out
109
110 #define READMEM(x,nbytes) do { \
111 x = (char *)p; \
112 p += XDR_QUADLEN(nbytes); \
113 } while (0)
114 #define SAVEMEM(x,nbytes) do { \
115 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
116 savemem(argp, p, nbytes) : \
117 (char *)p)) { \
118 dprintk("NFSD: xdr error (%s:%d)\n", \
119 __FILE__, __LINE__); \
120 goto xdr_error; \
121 } \
122 p += XDR_QUADLEN(nbytes); \
123 } while (0)
124 #define COPYMEM(x,nbytes) do { \
125 memcpy((x), p, nbytes); \
126 p += XDR_QUADLEN(nbytes); \
127 } while (0)
128
129 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
130 #define READ_BUF(nbytes) do { \
131 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
132 p = argp->p; \
133 argp->p += XDR_QUADLEN(nbytes); \
134 } else if (!(p = read_buf(argp, nbytes))) { \
135 dprintk("NFSD: xdr error (%s:%d)\n", \
136 __FILE__, __LINE__); \
137 goto xdr_error; \
138 } \
139 } while (0)
140
141 static void next_decode_page(struct nfsd4_compoundargs *argp)
142 {
143 argp->p = page_address(argp->pagelist[0]);
144 argp->pagelist++;
145 if (argp->pagelen < PAGE_SIZE) {
146 argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
147 argp->pagelen = 0;
148 } else {
149 argp->end = argp->p + (PAGE_SIZE>>2);
150 argp->pagelen -= PAGE_SIZE;
151 }
152 }
153
154 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
155 {
156 /* We want more bytes than seem to be available.
157 * Maybe we need a new page, maybe we have just run out
158 */
159 unsigned int avail = (char *)argp->end - (char *)argp->p;
160 __be32 *p;
161
162 if (argp->pagelen == 0) {
163 struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
164
165 if (!argp->tail) {
166 argp->tail = true;
167 avail = vec->iov_len;
168 argp->p = vec->iov_base;
169 argp->end = vec->iov_base + avail;
170 }
171
172 if (avail < nbytes)
173 return NULL;
174
175 p = argp->p;
176 argp->p += XDR_QUADLEN(nbytes);
177 return p;
178 }
179
180 if (avail + argp->pagelen < nbytes)
181 return NULL;
182 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
183 return NULL;
184 /* ok, we can do it with the current plus the next page */
185 if (nbytes <= sizeof(argp->tmp))
186 p = argp->tmp;
187 else {
188 kfree(argp->tmpp);
189 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
190 if (!p)
191 return NULL;
192
193 }
194 /*
195 * The following memcpy is safe because read_buf is always
196 * called with nbytes > avail, and the two cases above both
197 * guarantee p points to at least nbytes bytes.
198 */
199 memcpy(p, argp->p, avail);
200 next_decode_page(argp);
201 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
202 argp->p += XDR_QUADLEN(nbytes - avail);
203 return p;
204 }
205
206 static int zero_clientid(clientid_t *clid)
207 {
208 return (clid->cl_boot == 0) && (clid->cl_id == 0);
209 }
210
211 /**
212 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
213 * @argp: NFSv4 compound argument structure
214 * @p: pointer to be freed (with kfree())
215 *
216 * Marks @p to be freed when processing the compound operation
217 * described in @argp finishes.
218 */
219 static void *
220 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
221 {
222 struct svcxdr_tmpbuf *tb;
223
224 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
225 if (!tb)
226 return NULL;
227 tb->next = argp->to_free;
228 argp->to_free = tb;
229 return tb->buf;
230 }
231
232 /*
233 * For xdr strings that need to be passed to other kernel api's
234 * as null-terminated strings.
235 *
236 * Note null-terminating in place usually isn't safe since the
237 * buffer might end on a page boundary.
238 */
239 static char *
240 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
241 {
242 char *p = svcxdr_tmpalloc(argp, len + 1);
243
244 if (!p)
245 return NULL;
246 memcpy(p, buf, len);
247 p[len] = '\0';
248 return p;
249 }
250
251 /**
252 * savemem - duplicate a chunk of memory for later processing
253 * @argp: NFSv4 compound argument structure to be freed with
254 * @p: pointer to be duplicated
255 * @nbytes: length to be duplicated
256 *
257 * Returns a pointer to a copy of @nbytes bytes of memory at @p
258 * that are preserved until processing of the NFSv4 compound
259 * operation described by @argp finishes.
260 */
261 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
262 {
263 void *ret;
264
265 ret = svcxdr_tmpalloc(argp, nbytes);
266 if (!ret)
267 return NULL;
268 memcpy(ret, p, nbytes);
269 return ret;
270 }
271
272 /*
273 * We require the high 32 bits of 'seconds' to be 0, and
274 * we ignore all 32 bits of 'nseconds'.
275 */
276 static __be32
277 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
278 {
279 DECODE_HEAD;
280 u64 sec;
281
282 READ_BUF(12);
283 p = xdr_decode_hyper(p, &sec);
284 tv->tv_sec = sec;
285 tv->tv_nsec = be32_to_cpup(p++);
286 if (tv->tv_nsec >= (u32)1000000000)
287 return nfserr_inval;
288
289 DECODE_TAIL;
290 }
291
292 static __be32
293 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
294 {
295 u32 bmlen;
296 DECODE_HEAD;
297
298 bmval[0] = 0;
299 bmval[1] = 0;
300 bmval[2] = 0;
301
302 READ_BUF(4);
303 bmlen = be32_to_cpup(p++);
304 if (bmlen > 1000)
305 goto xdr_error;
306
307 READ_BUF(bmlen << 2);
308 if (bmlen > 0)
309 bmval[0] = be32_to_cpup(p++);
310 if (bmlen > 1)
311 bmval[1] = be32_to_cpup(p++);
312 if (bmlen > 2)
313 bmval[2] = be32_to_cpup(p++);
314
315 DECODE_TAIL;
316 }
317
318 static __be32
319 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
320 struct iattr *iattr, struct nfs4_acl **acl,
321 struct xdr_netobj *label, int *umask)
322 {
323 struct timespec ts;
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, &ts);
426 iattr->ia_atime = timespec_to_timespec64(ts);
427 if (status)
428 return status;
429 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
430 break;
431 case NFS4_SET_TO_SERVER_TIME:
432 iattr->ia_valid |= ATTR_ATIME;
433 break;
434 default:
435 goto xdr_error;
436 }
437 }
438 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
439 READ_BUF(4);
440 len += 4;
441 dummy32 = be32_to_cpup(p++);
442 switch (dummy32) {
443 case NFS4_SET_TO_CLIENT_TIME:
444 len += 12;
445 status = nfsd4_decode_time(argp, &ts);
446 iattr->ia_mtime = timespec_to_timespec64(ts);
447 if (status)
448 return status;
449 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
450 break;
451 case NFS4_SET_TO_SERVER_TIME:
452 iattr->ia_valid |= ATTR_MTIME;
453 break;
454 default:
455 goto xdr_error;
456 }
457 }
458
459 label->len = 0;
460 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
461 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
462 READ_BUF(4);
463 len += 4;
464 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
465 READ_BUF(4);
466 len += 4;
467 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
468 READ_BUF(4);
469 len += 4;
470 dummy32 = be32_to_cpup(p++);
471 READ_BUF(dummy32);
472 if (dummy32 > NFS4_MAXLABELLEN)
473 return nfserr_badlabel;
474 len += (XDR_QUADLEN(dummy32) << 2);
475 READMEM(buf, dummy32);
476 label->len = dummy32;
477 label->data = svcxdr_dupstr(argp, buf, dummy32);
478 if (!label->data)
479 return nfserr_jukebox;
480 }
481 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
482 if (!umask)
483 goto xdr_error;
484 READ_BUF(8);
485 len += 8;
486 dummy32 = be32_to_cpup(p++);
487 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
488 dummy32 = be32_to_cpup(p++);
489 *umask = dummy32 & S_IRWXUGO;
490 iattr->ia_valid |= ATTR_MODE;
491 }
492 if (len != expected_len)
493 goto xdr_error;
494
495 DECODE_TAIL;
496 }
497
498 static __be32
499 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
500 {
501 DECODE_HEAD;
502
503 READ_BUF(sizeof(stateid_t));
504 sid->si_generation = be32_to_cpup(p++);
505 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
506
507 DECODE_TAIL;
508 }
509
510 static __be32
511 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
512 {
513 DECODE_HEAD;
514
515 READ_BUF(4);
516 access->ac_req_access = be32_to_cpup(p++);
517
518 DECODE_TAIL;
519 }
520
521 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
522 {
523 DECODE_HEAD;
524 u32 dummy, uid, gid;
525 char *machine_name;
526 int i;
527 int nr_secflavs;
528
529 /* callback_sec_params4 */
530 READ_BUF(4);
531 nr_secflavs = be32_to_cpup(p++);
532 if (nr_secflavs)
533 cbs->flavor = (u32)(-1);
534 else
535 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
536 cbs->flavor = 0;
537 for (i = 0; i < nr_secflavs; ++i) {
538 READ_BUF(4);
539 dummy = be32_to_cpup(p++);
540 switch (dummy) {
541 case RPC_AUTH_NULL:
542 /* Nothing to read */
543 if (cbs->flavor == (u32)(-1))
544 cbs->flavor = RPC_AUTH_NULL;
545 break;
546 case RPC_AUTH_UNIX:
547 READ_BUF(8);
548 /* stamp */
549 dummy = be32_to_cpup(p++);
550
551 /* machine name */
552 dummy = be32_to_cpup(p++);
553 READ_BUF(dummy);
554 SAVEMEM(machine_name, dummy);
555
556 /* uid, gid */
557 READ_BUF(8);
558 uid = be32_to_cpup(p++);
559 gid = be32_to_cpup(p++);
560
561 /* more gids */
562 READ_BUF(4);
563 dummy = be32_to_cpup(p++);
564 READ_BUF(dummy * 4);
565 if (cbs->flavor == (u32)(-1)) {
566 kuid_t kuid = make_kuid(&init_user_ns, uid);
567 kgid_t kgid = make_kgid(&init_user_ns, gid);
568 if (uid_valid(kuid) && gid_valid(kgid)) {
569 cbs->uid = kuid;
570 cbs->gid = kgid;
571 cbs->flavor = RPC_AUTH_UNIX;
572 } else {
573 dprintk("RPC_AUTH_UNIX with invalid"
574 "uid or gid ignoring!\n");
575 }
576 }
577 break;
578 case RPC_AUTH_GSS:
579 dprintk("RPC_AUTH_GSS callback secflavor "
580 "not supported!\n");
581 READ_BUF(8);
582 /* gcbp_service */
583 dummy = be32_to_cpup(p++);
584 /* gcbp_handle_from_server */
585 dummy = be32_to_cpup(p++);
586 READ_BUF(dummy);
587 p += XDR_QUADLEN(dummy);
588 /* gcbp_handle_from_client */
589 READ_BUF(4);
590 dummy = be32_to_cpup(p++);
591 READ_BUF(dummy);
592 break;
593 default:
594 dprintk("Illegal callback secflavor\n");
595 return nfserr_inval;
596 }
597 }
598 DECODE_TAIL;
599 }
600
601 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
602 {
603 DECODE_HEAD;
604
605 READ_BUF(4);
606 bc->bc_cb_program = be32_to_cpup(p++);
607 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
608
609 DECODE_TAIL;
610 }
611
612 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
613 {
614 DECODE_HEAD;
615
616 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
617 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
618 bcts->dir = be32_to_cpup(p++);
619 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
620 * could help us figure out we should be using it. */
621 DECODE_TAIL;
622 }
623
624 static __be32
625 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
626 {
627 DECODE_HEAD;
628
629 READ_BUF(4);
630 close->cl_seqid = be32_to_cpup(p++);
631 return nfsd4_decode_stateid(argp, &close->cl_stateid);
632
633 DECODE_TAIL;
634 }
635
636
637 static __be32
638 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
639 {
640 DECODE_HEAD;
641
642 READ_BUF(12);
643 p = xdr_decode_hyper(p, &commit->co_offset);
644 commit->co_count = be32_to_cpup(p++);
645
646 DECODE_TAIL;
647 }
648
649 static __be32
650 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
651 {
652 DECODE_HEAD;
653
654 READ_BUF(4);
655 create->cr_type = be32_to_cpup(p++);
656 switch (create->cr_type) {
657 case NF4LNK:
658 READ_BUF(4);
659 create->cr_datalen = be32_to_cpup(p++);
660 READ_BUF(create->cr_datalen);
661 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
662 if (!create->cr_data)
663 return nfserr_jukebox;
664 break;
665 case NF4BLK:
666 case NF4CHR:
667 READ_BUF(8);
668 create->cr_specdata1 = be32_to_cpup(p++);
669 create->cr_specdata2 = be32_to_cpup(p++);
670 break;
671 case NF4SOCK:
672 case NF4FIFO:
673 case NF4DIR:
674 default:
675 break;
676 }
677
678 READ_BUF(4);
679 create->cr_namelen = be32_to_cpup(p++);
680 READ_BUF(create->cr_namelen);
681 SAVEMEM(create->cr_name, create->cr_namelen);
682 if ((status = check_filename(create->cr_name, create->cr_namelen)))
683 return status;
684
685 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
686 &create->cr_acl, &create->cr_label,
687 &create->cr_umask);
688 if (status)
689 goto out;
690
691 DECODE_TAIL;
692 }
693
694 static inline __be32
695 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
696 {
697 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
698 }
699
700 static inline __be32
701 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
702 {
703 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
704 }
705
706 static __be32
707 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
708 {
709 DECODE_HEAD;
710
711 READ_BUF(4);
712 link->li_namelen = be32_to_cpup(p++);
713 READ_BUF(link->li_namelen);
714 SAVEMEM(link->li_name, link->li_namelen);
715 if ((status = check_filename(link->li_name, link->li_namelen)))
716 return status;
717
718 DECODE_TAIL;
719 }
720
721 static __be32
722 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
723 {
724 DECODE_HEAD;
725
726 /*
727 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
728 */
729 READ_BUF(28);
730 lock->lk_type = be32_to_cpup(p++);
731 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
732 goto xdr_error;
733 lock->lk_reclaim = be32_to_cpup(p++);
734 p = xdr_decode_hyper(p, &lock->lk_offset);
735 p = xdr_decode_hyper(p, &lock->lk_length);
736 lock->lk_is_new = be32_to_cpup(p++);
737
738 if (lock->lk_is_new) {
739 READ_BUF(4);
740 lock->lk_new_open_seqid = be32_to_cpup(p++);
741 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
742 if (status)
743 return status;
744 READ_BUF(8 + sizeof(clientid_t));
745 lock->lk_new_lock_seqid = be32_to_cpup(p++);
746 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
747 lock->lk_new_owner.len = be32_to_cpup(p++);
748 READ_BUF(lock->lk_new_owner.len);
749 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
750 } else {
751 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
752 if (status)
753 return status;
754 READ_BUF(4);
755 lock->lk_old_lock_seqid = be32_to_cpup(p++);
756 }
757
758 DECODE_TAIL;
759 }
760
761 static __be32
762 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
763 {
764 DECODE_HEAD;
765
766 READ_BUF(32);
767 lockt->lt_type = be32_to_cpup(p++);
768 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
769 goto xdr_error;
770 p = xdr_decode_hyper(p, &lockt->lt_offset);
771 p = xdr_decode_hyper(p, &lockt->lt_length);
772 COPYMEM(&lockt->lt_clientid, 8);
773 lockt->lt_owner.len = be32_to_cpup(p++);
774 READ_BUF(lockt->lt_owner.len);
775 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
776
777 DECODE_TAIL;
778 }
779
780 static __be32
781 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
782 {
783 DECODE_HEAD;
784
785 READ_BUF(8);
786 locku->lu_type = be32_to_cpup(p++);
787 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
788 goto xdr_error;
789 locku->lu_seqid = be32_to_cpup(p++);
790 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
791 if (status)
792 return status;
793 READ_BUF(16);
794 p = xdr_decode_hyper(p, &locku->lu_offset);
795 p = xdr_decode_hyper(p, &locku->lu_length);
796
797 DECODE_TAIL;
798 }
799
800 static __be32
801 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
802 {
803 DECODE_HEAD;
804
805 READ_BUF(4);
806 lookup->lo_len = be32_to_cpup(p++);
807 READ_BUF(lookup->lo_len);
808 SAVEMEM(lookup->lo_name, lookup->lo_len);
809 if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
810 return status;
811
812 DECODE_TAIL;
813 }
814
815 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
816 {
817 __be32 *p;
818 u32 w;
819
820 READ_BUF(4);
821 w = be32_to_cpup(p++);
822 *share_access = w & NFS4_SHARE_ACCESS_MASK;
823 *deleg_want = w & NFS4_SHARE_WANT_MASK;
824 if (deleg_when)
825 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
826
827 switch (w & NFS4_SHARE_ACCESS_MASK) {
828 case NFS4_SHARE_ACCESS_READ:
829 case NFS4_SHARE_ACCESS_WRITE:
830 case NFS4_SHARE_ACCESS_BOTH:
831 break;
832 default:
833 return nfserr_bad_xdr;
834 }
835 w &= ~NFS4_SHARE_ACCESS_MASK;
836 if (!w)
837 return nfs_ok;
838 if (!argp->minorversion)
839 return nfserr_bad_xdr;
840 switch (w & NFS4_SHARE_WANT_MASK) {
841 case NFS4_SHARE_WANT_NO_PREFERENCE:
842 case NFS4_SHARE_WANT_READ_DELEG:
843 case NFS4_SHARE_WANT_WRITE_DELEG:
844 case NFS4_SHARE_WANT_ANY_DELEG:
845 case NFS4_SHARE_WANT_NO_DELEG:
846 case NFS4_SHARE_WANT_CANCEL:
847 break;
848 default:
849 return nfserr_bad_xdr;
850 }
851 w &= ~NFS4_SHARE_WANT_MASK;
852 if (!w)
853 return nfs_ok;
854
855 if (!deleg_when) /* open_downgrade */
856 return nfserr_inval;
857 switch (w) {
858 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
859 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
860 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
861 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
862 return nfs_ok;
863 }
864 xdr_error:
865 return nfserr_bad_xdr;
866 }
867
868 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
869 {
870 __be32 *p;
871
872 READ_BUF(4);
873 *x = be32_to_cpup(p++);
874 /* Note: unlinke access bits, deny bits may be zero. */
875 if (*x & ~NFS4_SHARE_DENY_BOTH)
876 return nfserr_bad_xdr;
877 return nfs_ok;
878 xdr_error:
879 return nfserr_bad_xdr;
880 }
881
882 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
883 {
884 __be32 *p;
885
886 READ_BUF(4);
887 o->len = be32_to_cpup(p++);
888
889 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
890 return nfserr_bad_xdr;
891
892 READ_BUF(o->len);
893 SAVEMEM(o->data, o->len);
894 return nfs_ok;
895 xdr_error:
896 return nfserr_bad_xdr;
897 }
898
899 static __be32
900 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
901 {
902 DECODE_HEAD;
903 u32 dummy;
904
905 memset(open->op_bmval, 0, sizeof(open->op_bmval));
906 open->op_iattr.ia_valid = 0;
907 open->op_openowner = NULL;
908
909 open->op_xdr_error = 0;
910 /* seqid, share_access, share_deny, clientid, ownerlen */
911 READ_BUF(4);
912 open->op_seqid = be32_to_cpup(p++);
913 /* decode, yet ignore deleg_when until supported */
914 status = nfsd4_decode_share_access(argp, &open->op_share_access,
915 &open->op_deleg_want, &dummy);
916 if (status)
917 goto xdr_error;
918 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
919 if (status)
920 goto xdr_error;
921 READ_BUF(sizeof(clientid_t));
922 COPYMEM(&open->op_clientid, sizeof(clientid_t));
923 status = nfsd4_decode_opaque(argp, &open->op_owner);
924 if (status)
925 goto xdr_error;
926 READ_BUF(4);
927 open->op_create = be32_to_cpup(p++);
928 switch (open->op_create) {
929 case NFS4_OPEN_NOCREATE:
930 break;
931 case NFS4_OPEN_CREATE:
932 READ_BUF(4);
933 open->op_createmode = be32_to_cpup(p++);
934 switch (open->op_createmode) {
935 case NFS4_CREATE_UNCHECKED:
936 case NFS4_CREATE_GUARDED:
937 status = nfsd4_decode_fattr(argp, open->op_bmval,
938 &open->op_iattr, &open->op_acl, &open->op_label,
939 &open->op_umask);
940 if (status)
941 goto out;
942 break;
943 case NFS4_CREATE_EXCLUSIVE:
944 READ_BUF(NFS4_VERIFIER_SIZE);
945 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
946 break;
947 case NFS4_CREATE_EXCLUSIVE4_1:
948 if (argp->minorversion < 1)
949 goto xdr_error;
950 READ_BUF(NFS4_VERIFIER_SIZE);
951 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
952 status = nfsd4_decode_fattr(argp, open->op_bmval,
953 &open->op_iattr, &open->op_acl, &open->op_label,
954 &open->op_umask);
955 if (status)
956 goto out;
957 break;
958 default:
959 goto xdr_error;
960 }
961 break;
962 default:
963 goto xdr_error;
964 }
965
966 /* open_claim */
967 READ_BUF(4);
968 open->op_claim_type = be32_to_cpup(p++);
969 switch (open->op_claim_type) {
970 case NFS4_OPEN_CLAIM_NULL:
971 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
972 READ_BUF(4);
973 open->op_fname.len = be32_to_cpup(p++);
974 READ_BUF(open->op_fname.len);
975 SAVEMEM(open->op_fname.data, open->op_fname.len);
976 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
977 return status;
978 break;
979 case NFS4_OPEN_CLAIM_PREVIOUS:
980 READ_BUF(4);
981 open->op_delegate_type = be32_to_cpup(p++);
982 break;
983 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
984 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
985 if (status)
986 return status;
987 READ_BUF(4);
988 open->op_fname.len = be32_to_cpup(p++);
989 READ_BUF(open->op_fname.len);
990 SAVEMEM(open->op_fname.data, open->op_fname.len);
991 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
992 return status;
993 break;
994 case NFS4_OPEN_CLAIM_FH:
995 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
996 if (argp->minorversion < 1)
997 goto xdr_error;
998 /* void */
999 break;
1000 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1001 if (argp->minorversion < 1)
1002 goto xdr_error;
1003 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1004 if (status)
1005 return status;
1006 break;
1007 default:
1008 goto xdr_error;
1009 }
1010
1011 DECODE_TAIL;
1012 }
1013
1014 static __be32
1015 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1016 {
1017 DECODE_HEAD;
1018
1019 if (argp->minorversion >= 1)
1020 return nfserr_notsupp;
1021
1022 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1023 if (status)
1024 return status;
1025 READ_BUF(4);
1026 open_conf->oc_seqid = be32_to_cpup(p++);
1027
1028 DECODE_TAIL;
1029 }
1030
1031 static __be32
1032 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1033 {
1034 DECODE_HEAD;
1035
1036 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1037 if (status)
1038 return status;
1039 READ_BUF(4);
1040 open_down->od_seqid = be32_to_cpup(p++);
1041 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1042 &open_down->od_deleg_want, NULL);
1043 if (status)
1044 return status;
1045 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1046 if (status)
1047 return status;
1048 DECODE_TAIL;
1049 }
1050
1051 static __be32
1052 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1053 {
1054 DECODE_HEAD;
1055
1056 READ_BUF(4);
1057 putfh->pf_fhlen = be32_to_cpup(p++);
1058 if (putfh->pf_fhlen > NFS4_FHSIZE)
1059 goto xdr_error;
1060 READ_BUF(putfh->pf_fhlen);
1061 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1062
1063 DECODE_TAIL;
1064 }
1065
1066 static __be32
1067 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1068 {
1069 if (argp->minorversion == 0)
1070 return nfs_ok;
1071 return nfserr_notsupp;
1072 }
1073
1074 static __be32
1075 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1076 {
1077 DECODE_HEAD;
1078
1079 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1080 if (status)
1081 return status;
1082 READ_BUF(12);
1083 p = xdr_decode_hyper(p, &read->rd_offset);
1084 read->rd_length = be32_to_cpup(p++);
1085
1086 DECODE_TAIL;
1087 }
1088
1089 static __be32
1090 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1091 {
1092 DECODE_HEAD;
1093
1094 READ_BUF(24);
1095 p = xdr_decode_hyper(p, &readdir->rd_cookie);
1096 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1097 readdir->rd_dircount = be32_to_cpup(p++);
1098 readdir->rd_maxcount = be32_to_cpup(p++);
1099 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1100 goto out;
1101
1102 DECODE_TAIL;
1103 }
1104
1105 static __be32
1106 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1107 {
1108 DECODE_HEAD;
1109
1110 READ_BUF(4);
1111 remove->rm_namelen = be32_to_cpup(p++);
1112 READ_BUF(remove->rm_namelen);
1113 SAVEMEM(remove->rm_name, remove->rm_namelen);
1114 if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1115 return status;
1116
1117 DECODE_TAIL;
1118 }
1119
1120 static __be32
1121 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1122 {
1123 DECODE_HEAD;
1124
1125 READ_BUF(4);
1126 rename->rn_snamelen = be32_to_cpup(p++);
1127 READ_BUF(rename->rn_snamelen);
1128 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1129 READ_BUF(4);
1130 rename->rn_tnamelen = be32_to_cpup(p++);
1131 READ_BUF(rename->rn_tnamelen);
1132 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1133 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1134 return status;
1135 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1136 return status;
1137
1138 DECODE_TAIL;
1139 }
1140
1141 static __be32
1142 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1143 {
1144 DECODE_HEAD;
1145
1146 if (argp->minorversion >= 1)
1147 return nfserr_notsupp;
1148
1149 READ_BUF(sizeof(clientid_t));
1150 COPYMEM(clientid, sizeof(clientid_t));
1151
1152 DECODE_TAIL;
1153 }
1154
1155 static __be32
1156 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1157 struct nfsd4_secinfo *secinfo)
1158 {
1159 DECODE_HEAD;
1160
1161 READ_BUF(4);
1162 secinfo->si_namelen = be32_to_cpup(p++);
1163 READ_BUF(secinfo->si_namelen);
1164 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1165 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1166 if (status)
1167 return status;
1168 DECODE_TAIL;
1169 }
1170
1171 static __be32
1172 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1173 struct nfsd4_secinfo_no_name *sin)
1174 {
1175 DECODE_HEAD;
1176
1177 READ_BUF(4);
1178 sin->sin_style = be32_to_cpup(p++);
1179 DECODE_TAIL;
1180 }
1181
1182 static __be32
1183 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1184 {
1185 __be32 status;
1186
1187 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1188 if (status)
1189 return status;
1190 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1191 &setattr->sa_acl, &setattr->sa_label, NULL);
1192 }
1193
1194 static __be32
1195 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1196 {
1197 DECODE_HEAD;
1198
1199 if (argp->minorversion >= 1)
1200 return nfserr_notsupp;
1201
1202 READ_BUF(NFS4_VERIFIER_SIZE);
1203 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1204
1205 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1206 if (status)
1207 return nfserr_bad_xdr;
1208 READ_BUF(8);
1209 setclientid->se_callback_prog = be32_to_cpup(p++);
1210 setclientid->se_callback_netid_len = be32_to_cpup(p++);
1211 READ_BUF(setclientid->se_callback_netid_len);
1212 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1213 READ_BUF(4);
1214 setclientid->se_callback_addr_len = be32_to_cpup(p++);
1215
1216 READ_BUF(setclientid->se_callback_addr_len);
1217 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1218 READ_BUF(4);
1219 setclientid->se_callback_ident = be32_to_cpup(p++);
1220
1221 DECODE_TAIL;
1222 }
1223
1224 static __be32
1225 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1226 {
1227 DECODE_HEAD;
1228
1229 if (argp->minorversion >= 1)
1230 return nfserr_notsupp;
1231
1232 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1233 COPYMEM(&scd_c->sc_clientid, 8);
1234 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1235
1236 DECODE_TAIL;
1237 }
1238
1239 /* Also used for NVERIFY */
1240 static __be32
1241 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1242 {
1243 DECODE_HEAD;
1244
1245 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1246 goto out;
1247
1248 /* For convenience's sake, we compare raw xdr'd attributes in
1249 * nfsd4_proc_verify */
1250
1251 READ_BUF(4);
1252 verify->ve_attrlen = be32_to_cpup(p++);
1253 READ_BUF(verify->ve_attrlen);
1254 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1255
1256 DECODE_TAIL;
1257 }
1258
1259 static __be32
1260 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1261 {
1262 int avail;
1263 int len;
1264 DECODE_HEAD;
1265
1266 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1267 if (status)
1268 return status;
1269 READ_BUF(16);
1270 p = xdr_decode_hyper(p, &write->wr_offset);
1271 write->wr_stable_how = be32_to_cpup(p++);
1272 if (write->wr_stable_how > NFS_FILE_SYNC)
1273 goto xdr_error;
1274 write->wr_buflen = be32_to_cpup(p++);
1275
1276 /* Sorry .. no magic macros for this.. *
1277 * READ_BUF(write->wr_buflen);
1278 * SAVEMEM(write->wr_buf, write->wr_buflen);
1279 */
1280 avail = (char*)argp->end - (char*)argp->p;
1281 if (avail + argp->pagelen < write->wr_buflen) {
1282 dprintk("NFSD: xdr error (%s:%d)\n",
1283 __FILE__, __LINE__);
1284 goto xdr_error;
1285 }
1286 write->wr_head.iov_base = p;
1287 write->wr_head.iov_len = avail;
1288 write->wr_pagelist = argp->pagelist;
1289
1290 len = XDR_QUADLEN(write->wr_buflen) << 2;
1291 if (len >= avail) {
1292 int pages;
1293
1294 len -= avail;
1295
1296 pages = len >> PAGE_SHIFT;
1297 argp->pagelist += pages;
1298 argp->pagelen -= pages * PAGE_SIZE;
1299 len -= pages * PAGE_SIZE;
1300
1301 next_decode_page(argp);
1302 }
1303 argp->p += XDR_QUADLEN(len);
1304
1305 DECODE_TAIL;
1306 }
1307
1308 static __be32
1309 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1310 {
1311 DECODE_HEAD;
1312
1313 if (argp->minorversion >= 1)
1314 return nfserr_notsupp;
1315
1316 READ_BUF(12);
1317 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1318 rlockowner->rl_owner.len = be32_to_cpup(p++);
1319 READ_BUF(rlockowner->rl_owner.len);
1320 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1321
1322 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1323 return nfserr_inval;
1324 DECODE_TAIL;
1325 }
1326
1327 static __be32
1328 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1329 struct nfsd4_exchange_id *exid)
1330 {
1331 int dummy, tmp;
1332 DECODE_HEAD;
1333
1334 READ_BUF(NFS4_VERIFIER_SIZE);
1335 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1336
1337 status = nfsd4_decode_opaque(argp, &exid->clname);
1338 if (status)
1339 return nfserr_bad_xdr;
1340
1341 READ_BUF(4);
1342 exid->flags = be32_to_cpup(p++);
1343
1344 /* Ignore state_protect4_a */
1345 READ_BUF(4);
1346 exid->spa_how = be32_to_cpup(p++);
1347 switch (exid->spa_how) {
1348 case SP4_NONE:
1349 break;
1350 case SP4_MACH_CRED:
1351 /* spo_must_enforce */
1352 status = nfsd4_decode_bitmap(argp,
1353 exid->spo_must_enforce);
1354 if (status)
1355 goto out;
1356 /* spo_must_allow */
1357 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1358 if (status)
1359 goto out;
1360 break;
1361 case SP4_SSV:
1362 /* ssp_ops */
1363 READ_BUF(4);
1364 dummy = be32_to_cpup(p++);
1365 READ_BUF(dummy * 4);
1366 p += dummy;
1367
1368 READ_BUF(4);
1369 dummy = be32_to_cpup(p++);
1370 READ_BUF(dummy * 4);
1371 p += dummy;
1372
1373 /* ssp_hash_algs<> */
1374 READ_BUF(4);
1375 tmp = be32_to_cpup(p++);
1376 while (tmp--) {
1377 READ_BUF(4);
1378 dummy = be32_to_cpup(p++);
1379 READ_BUF(dummy);
1380 p += XDR_QUADLEN(dummy);
1381 }
1382
1383 /* ssp_encr_algs<> */
1384 READ_BUF(4);
1385 tmp = be32_to_cpup(p++);
1386 while (tmp--) {
1387 READ_BUF(4);
1388 dummy = be32_to_cpup(p++);
1389 READ_BUF(dummy);
1390 p += XDR_QUADLEN(dummy);
1391 }
1392
1393 /* ignore ssp_window and ssp_num_gss_handles: */
1394 READ_BUF(8);
1395 break;
1396 default:
1397 goto xdr_error;
1398 }
1399
1400 /* Ignore Implementation ID */
1401 READ_BUF(4); /* nfs_impl_id4 array length */
1402 dummy = be32_to_cpup(p++);
1403
1404 if (dummy > 1)
1405 goto xdr_error;
1406
1407 if (dummy == 1) {
1408 /* nii_domain */
1409 READ_BUF(4);
1410 dummy = be32_to_cpup(p++);
1411 READ_BUF(dummy);
1412 p += XDR_QUADLEN(dummy);
1413
1414 /* nii_name */
1415 READ_BUF(4);
1416 dummy = be32_to_cpup(p++);
1417 READ_BUF(dummy);
1418 p += XDR_QUADLEN(dummy);
1419
1420 /* nii_date */
1421 READ_BUF(12);
1422 p += 3;
1423 }
1424 DECODE_TAIL;
1425 }
1426
1427 static __be32
1428 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1429 struct nfsd4_create_session *sess)
1430 {
1431 DECODE_HEAD;
1432 u32 dummy;
1433
1434 READ_BUF(16);
1435 COPYMEM(&sess->clientid, 8);
1436 sess->seqid = be32_to_cpup(p++);
1437 sess->flags = be32_to_cpup(p++);
1438
1439 /* Fore channel attrs */
1440 READ_BUF(28);
1441 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1442 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1443 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1444 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1445 sess->fore_channel.maxops = be32_to_cpup(p++);
1446 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1447 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1448 if (sess->fore_channel.nr_rdma_attrs == 1) {
1449 READ_BUF(4);
1450 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1451 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1452 dprintk("Too many fore channel attr bitmaps!\n");
1453 goto xdr_error;
1454 }
1455
1456 /* Back channel attrs */
1457 READ_BUF(28);
1458 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1459 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1460 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1461 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1462 sess->back_channel.maxops = be32_to_cpup(p++);
1463 sess->back_channel.maxreqs = be32_to_cpup(p++);
1464 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1465 if (sess->back_channel.nr_rdma_attrs == 1) {
1466 READ_BUF(4);
1467 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1468 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1469 dprintk("Too many back channel attr bitmaps!\n");
1470 goto xdr_error;
1471 }
1472
1473 READ_BUF(4);
1474 sess->callback_prog = be32_to_cpup(p++);
1475 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1476 DECODE_TAIL;
1477 }
1478
1479 static __be32
1480 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1481 struct nfsd4_destroy_session *destroy_session)
1482 {
1483 DECODE_HEAD;
1484 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1485 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1486
1487 DECODE_TAIL;
1488 }
1489
1490 static __be32
1491 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1492 struct nfsd4_free_stateid *free_stateid)
1493 {
1494 DECODE_HEAD;
1495
1496 READ_BUF(sizeof(stateid_t));
1497 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1498 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1499
1500 DECODE_TAIL;
1501 }
1502
1503 static __be32
1504 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1505 struct nfsd4_sequence *seq)
1506 {
1507 DECODE_HEAD;
1508
1509 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1510 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1511 seq->seqid = be32_to_cpup(p++);
1512 seq->slotid = be32_to_cpup(p++);
1513 seq->maxslots = be32_to_cpup(p++);
1514 seq->cachethis = be32_to_cpup(p++);
1515
1516 DECODE_TAIL;
1517 }
1518
1519 static __be32
1520 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1521 {
1522 int i;
1523 __be32 *p, status;
1524 struct nfsd4_test_stateid_id *stateid;
1525
1526 READ_BUF(4);
1527 test_stateid->ts_num_ids = ntohl(*p++);
1528
1529 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1530
1531 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1532 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1533 if (!stateid) {
1534 status = nfserrno(-ENOMEM);
1535 goto out;
1536 }
1537
1538 INIT_LIST_HEAD(&stateid->ts_id_list);
1539 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1540
1541 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1542 if (status)
1543 goto out;
1544 }
1545
1546 status = 0;
1547 out:
1548 return status;
1549 xdr_error:
1550 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1551 status = nfserr_bad_xdr;
1552 goto out;
1553 }
1554
1555 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1556 {
1557 DECODE_HEAD;
1558
1559 READ_BUF(8);
1560 COPYMEM(&dc->clientid, 8);
1561
1562 DECODE_TAIL;
1563 }
1564
1565 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1566 {
1567 DECODE_HEAD;
1568
1569 READ_BUF(4);
1570 rc->rca_one_fs = be32_to_cpup(p++);
1571
1572 DECODE_TAIL;
1573 }
1574
1575 #ifdef CONFIG_NFSD_PNFS
1576 static __be32
1577 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1578 struct nfsd4_getdeviceinfo *gdev)
1579 {
1580 DECODE_HEAD;
1581 u32 num, i;
1582
1583 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1584 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1585 gdev->gd_layout_type = be32_to_cpup(p++);
1586 gdev->gd_maxcount = be32_to_cpup(p++);
1587 num = be32_to_cpup(p++);
1588 if (num) {
1589 if (num > 1000)
1590 goto xdr_error;
1591 READ_BUF(4 * num);
1592 gdev->gd_notify_types = be32_to_cpup(p++);
1593 for (i = 1; i < num; i++) {
1594 if (be32_to_cpup(p++)) {
1595 status = nfserr_inval;
1596 goto out;
1597 }
1598 }
1599 }
1600 DECODE_TAIL;
1601 }
1602
1603 static __be32
1604 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1605 struct nfsd4_layoutget *lgp)
1606 {
1607 DECODE_HEAD;
1608
1609 READ_BUF(36);
1610 lgp->lg_signal = be32_to_cpup(p++);
1611 lgp->lg_layout_type = be32_to_cpup(p++);
1612 lgp->lg_seg.iomode = be32_to_cpup(p++);
1613 p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1614 p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1615 p = xdr_decode_hyper(p, &lgp->lg_minlength);
1616
1617 status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1618 if (status)
1619 return status;
1620
1621 READ_BUF(4);
1622 lgp->lg_maxcount = be32_to_cpup(p++);
1623
1624 DECODE_TAIL;
1625 }
1626
1627 static __be32
1628 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1629 struct nfsd4_layoutcommit *lcp)
1630 {
1631 DECODE_HEAD;
1632 u32 timechange;
1633
1634 READ_BUF(20);
1635 p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1636 p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1637 lcp->lc_reclaim = be32_to_cpup(p++);
1638
1639 status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1640 if (status)
1641 return status;
1642
1643 READ_BUF(4);
1644 lcp->lc_newoffset = be32_to_cpup(p++);
1645 if (lcp->lc_newoffset) {
1646 READ_BUF(8);
1647 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1648 } else
1649 lcp->lc_last_wr = 0;
1650 READ_BUF(4);
1651 timechange = be32_to_cpup(p++);
1652 if (timechange) {
1653 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1654 if (status)
1655 return status;
1656 } else {
1657 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1658 }
1659 READ_BUF(8);
1660 lcp->lc_layout_type = be32_to_cpup(p++);
1661
1662 /*
1663 * Save the layout update in XDR format and let the layout driver deal
1664 * with it later.
1665 */
1666 lcp->lc_up_len = be32_to_cpup(p++);
1667 if (lcp->lc_up_len > 0) {
1668 READ_BUF(lcp->lc_up_len);
1669 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1670 }
1671
1672 DECODE_TAIL;
1673 }
1674
1675 static __be32
1676 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1677 struct nfsd4_layoutreturn *lrp)
1678 {
1679 DECODE_HEAD;
1680
1681 READ_BUF(16);
1682 lrp->lr_reclaim = be32_to_cpup(p++);
1683 lrp->lr_layout_type = be32_to_cpup(p++);
1684 lrp->lr_seg.iomode = be32_to_cpup(p++);
1685 lrp->lr_return_type = be32_to_cpup(p++);
1686 if (lrp->lr_return_type == RETURN_FILE) {
1687 READ_BUF(16);
1688 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1689 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1690
1691 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1692 if (status)
1693 return status;
1694
1695 READ_BUF(4);
1696 lrp->lrf_body_len = be32_to_cpup(p++);
1697 if (lrp->lrf_body_len > 0) {
1698 READ_BUF(lrp->lrf_body_len);
1699 READMEM(lrp->lrf_body, lrp->lrf_body_len);
1700 }
1701 } else {
1702 lrp->lr_seg.offset = 0;
1703 lrp->lr_seg.length = NFS4_MAX_UINT64;
1704 }
1705
1706 DECODE_TAIL;
1707 }
1708 #endif /* CONFIG_NFSD_PNFS */
1709
1710 static __be32
1711 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1712 struct nfsd4_fallocate *fallocate)
1713 {
1714 DECODE_HEAD;
1715
1716 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1717 if (status)
1718 return status;
1719
1720 READ_BUF(16);
1721 p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1722 xdr_decode_hyper(p, &fallocate->falloc_length);
1723
1724 DECODE_TAIL;
1725 }
1726
1727 static __be32
1728 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1729 {
1730 DECODE_HEAD;
1731
1732 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1733 if (status)
1734 return status;
1735 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1736 if (status)
1737 return status;
1738
1739 READ_BUF(8 + 8 + 8);
1740 p = xdr_decode_hyper(p, &clone->cl_src_pos);
1741 p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1742 p = xdr_decode_hyper(p, &clone->cl_count);
1743 DECODE_TAIL;
1744 }
1745
1746 static __be32
1747 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1748 {
1749 DECODE_HEAD;
1750 unsigned int tmp;
1751
1752 status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1753 if (status)
1754 return status;
1755 status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1756 if (status)
1757 return status;
1758
1759 READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1760 p = xdr_decode_hyper(p, &copy->cp_src_pos);
1761 p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1762 p = xdr_decode_hyper(p, &copy->cp_count);
1763 p++; /* ca_consecutive: we always do consecutive copies */
1764 copy->cp_synchronous = be32_to_cpup(p++);
1765 tmp = be32_to_cpup(p); /* Source server list not supported */
1766
1767 DECODE_TAIL;
1768 }
1769
1770 static __be32
1771 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1772 {
1773 DECODE_HEAD;
1774
1775 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1776 if (status)
1777 return status;
1778
1779 READ_BUF(8 + 4);
1780 p = xdr_decode_hyper(p, &seek->seek_offset);
1781 seek->seek_whence = be32_to_cpup(p);
1782
1783 DECODE_TAIL;
1784 }
1785
1786 static __be32
1787 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1788 {
1789 return nfs_ok;
1790 }
1791
1792 static __be32
1793 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1794 {
1795 return nfserr_notsupp;
1796 }
1797
1798 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1799
1800 static const nfsd4_dec nfsd4_dec_ops[] = {
1801 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1802 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1803 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1804 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1805 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1806 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1807 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1808 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1809 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1810 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1811 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1812 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1813 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1814 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1815 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1816 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1817 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1818 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1819 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1820 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1821 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1822 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1823 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1824 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1825 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1826 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1827 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1828 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1829 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1830 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1831 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1832 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1833 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1834 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1835 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1836 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1837 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1838
1839 /* new operations for NFSv4.1 */
1840 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1841 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1842 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1843 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1844 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1845 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1846 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1847 #ifdef CONFIG_NFSD_PNFS
1848 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1849 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1850 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit,
1851 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget,
1852 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn,
1853 #else
1854 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1855 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1856 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1857 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1858 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1859 #endif
1860 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1861 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1862 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1863 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1864 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1865 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1866 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1867
1868 /* new operations for NFSv4.2 */
1869 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1870 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy,
1871 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
1872 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1873 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
1874 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
1875 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
1876 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp,
1877 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1878 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1879 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
1880 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
1881 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone,
1882 };
1883
1884 static inline bool
1885 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1886 {
1887 if (op->opnum < FIRST_NFS4_OP)
1888 return false;
1889 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1890 return false;
1891 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1892 return false;
1893 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1894 return false;
1895 return true;
1896 }
1897
1898 static __be32
1899 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1900 {
1901 DECODE_HEAD;
1902 struct nfsd4_op *op;
1903 bool cachethis = false;
1904 int auth_slack= argp->rqstp->rq_auth_slack;
1905 int max_reply = auth_slack + 8; /* opcnt, status */
1906 int readcount = 0;
1907 int readbytes = 0;
1908 int i;
1909
1910 READ_BUF(4);
1911 argp->taglen = be32_to_cpup(p++);
1912 READ_BUF(argp->taglen);
1913 SAVEMEM(argp->tag, argp->taglen);
1914 READ_BUF(8);
1915 argp->minorversion = be32_to_cpup(p++);
1916 argp->opcnt = be32_to_cpup(p++);
1917 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1918
1919 if (argp->taglen > NFSD4_MAX_TAGLEN)
1920 goto xdr_error;
1921 /*
1922 * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
1923 * here, so we return success at the xdr level so that
1924 * nfsd4_proc can handle this is an NFS-level error.
1925 */
1926 if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1927 return 0;
1928
1929 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1930 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1931 if (!argp->ops) {
1932 argp->ops = argp->iops;
1933 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1934 goto xdr_error;
1935 }
1936 }
1937
1938 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1939 argp->opcnt = 0;
1940
1941 for (i = 0; i < argp->opcnt; i++) {
1942 op = &argp->ops[i];
1943 op->replay = NULL;
1944
1945 READ_BUF(4);
1946 op->opnum = be32_to_cpup(p++);
1947
1948 if (nfsd4_opnum_in_range(argp, op))
1949 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1950 else {
1951 op->opnum = OP_ILLEGAL;
1952 op->status = nfserr_op_illegal;
1953 }
1954 op->opdesc = OPDESC(op);
1955 /*
1956 * We'll try to cache the result in the DRC if any one
1957 * op in the compound wants to be cached:
1958 */
1959 cachethis |= nfsd4_cache_this_op(op);
1960
1961 if (op->opnum == OP_READ) {
1962 readcount++;
1963 readbytes += nfsd4_max_reply(argp->rqstp, op);
1964 } else
1965 max_reply += nfsd4_max_reply(argp->rqstp, op);
1966 /*
1967 * OP_LOCK and OP_LOCKT may return a conflicting lock.
1968 * (Special case because it will just skip encoding this
1969 * if it runs out of xdr buffer space, and it is the only
1970 * operation that behaves this way.)
1971 */
1972 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1973 max_reply += NFS4_OPAQUE_LIMIT;
1974
1975 if (op->status) {
1976 argp->opcnt = i+1;
1977 break;
1978 }
1979 }
1980 /* Sessions make the DRC unnecessary: */
1981 if (argp->minorversion)
1982 cachethis = false;
1983 svc_reserve(argp->rqstp, max_reply + readbytes);
1984 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1985
1986 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1987 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1988
1989 DECODE_TAIL;
1990 }
1991
1992 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
1993 struct svc_export *exp)
1994 {
1995 if (exp->ex_flags & NFSEXP_V4ROOT) {
1996 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
1997 *p++ = 0;
1998 } else if (IS_I_VERSION(inode)) {
1999 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2000 } else {
2001 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2002 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2003 }
2004 return p;
2005 }
2006
2007 /*
2008 * ctime (in NFSv4, time_metadata) is not writeable, and the client
2009 * doesn't really care what resolution could theoretically be stored by
2010 * the filesystem.
2011 *
2012 * The client cares how close together changes can be while still
2013 * guaranteeing ctime changes. For most filesystems (which have
2014 * timestamps with nanosecond fields) that is limited by the resolution
2015 * of the time returned from current_time() (which I'm assuming to be
2016 * 1/HZ).
2017 */
2018 static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2019 {
2020 struct timespec ts;
2021 u32 ns;
2022
2023 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2024 ts = ns_to_timespec(ns);
2025
2026 p = xdr_encode_hyper(p, ts.tv_sec);
2027 *p++ = cpu_to_be32(ts.tv_nsec);
2028
2029 return p;
2030 }
2031
2032 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2033 {
2034 *p++ = cpu_to_be32(c->atomic);
2035 if (c->change_supported) {
2036 p = xdr_encode_hyper(p, c->before_change);
2037 p = xdr_encode_hyper(p, c->after_change);
2038 } else {
2039 *p++ = cpu_to_be32(c->before_ctime_sec);
2040 *p++ = cpu_to_be32(c->before_ctime_nsec);
2041 *p++ = cpu_to_be32(c->after_ctime_sec);
2042 *p++ = cpu_to_be32(c->after_ctime_nsec);
2043 }
2044 return p;
2045 }
2046
2047 /* Encode as an array of strings the string given with components
2048 * separated @sep, escaped with esc_enter and esc_exit.
2049 */
2050 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2051 char *components, char esc_enter,
2052 char esc_exit)
2053 {
2054 __be32 *p;
2055 __be32 pathlen;
2056 int pathlen_offset;
2057 int strlen, count=0;
2058 char *str, *end, *next;
2059
2060 dprintk("nfsd4_encode_components(%s)\n", components);
2061
2062 pathlen_offset = xdr->buf->len;
2063 p = xdr_reserve_space(xdr, 4);
2064 if (!p)
2065 return nfserr_resource;
2066 p++; /* We will fill this in with @count later */
2067
2068 end = str = components;
2069 while (*end) {
2070 bool found_esc = false;
2071
2072 /* try to parse as esc_start, ..., esc_end, sep */
2073 if (*str == esc_enter) {
2074 for (; *end && (*end != esc_exit); end++)
2075 /* find esc_exit or end of string */;
2076 next = end + 1;
2077 if (*end && (!*next || *next == sep)) {
2078 str++;
2079 found_esc = true;
2080 }
2081 }
2082
2083 if (!found_esc)
2084 for (; *end && (*end != sep); end++)
2085 /* find sep or end of string */;
2086
2087 strlen = end - str;
2088 if (strlen) {
2089 p = xdr_reserve_space(xdr, strlen + 4);
2090 if (!p)
2091 return nfserr_resource;
2092 p = xdr_encode_opaque(p, str, strlen);
2093 count++;
2094 }
2095 else
2096 end++;
2097 if (found_esc)
2098 end = next;
2099
2100 str = end;
2101 }
2102 pathlen = htonl(count);
2103 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2104 return 0;
2105 }
2106
2107 /* Encode as an array of strings the string given with components
2108 * separated @sep.
2109 */
2110 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2111 char *components)
2112 {
2113 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2114 }
2115
2116 /*
2117 * encode a location element of a fs_locations structure
2118 */
2119 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2120 struct nfsd4_fs_location *location)
2121 {
2122 __be32 status;
2123
2124 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2125 '[', ']');
2126 if (status)
2127 return status;
2128 status = nfsd4_encode_components(xdr, '/', location->path);
2129 if (status)
2130 return status;
2131 return 0;
2132 }
2133
2134 /*
2135 * Encode a path in RFC3530 'pathname4' format
2136 */
2137 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2138 const struct path *root,
2139 const struct path *path)
2140 {
2141 struct path cur = *path;
2142 __be32 *p;
2143 struct dentry **components = NULL;
2144 unsigned int ncomponents = 0;
2145 __be32 err = nfserr_jukebox;
2146
2147 dprintk("nfsd4_encode_components(");
2148
2149 path_get(&cur);
2150 /* First walk the path up to the nfsd root, and store the
2151 * dentries/path components in an array.
2152 */
2153 for (;;) {
2154 if (path_equal(&cur, root))
2155 break;
2156 if (cur.dentry == cur.mnt->mnt_root) {
2157 if (follow_up(&cur))
2158 continue;
2159 goto out_free;
2160 }
2161 if ((ncomponents & 15) == 0) {
2162 struct dentry **new;
2163 new = krealloc(components,
2164 sizeof(*new) * (ncomponents + 16),
2165 GFP_KERNEL);
2166 if (!new)
2167 goto out_free;
2168 components = new;
2169 }
2170 components[ncomponents++] = cur.dentry;
2171 cur.dentry = dget_parent(cur.dentry);
2172 }
2173 err = nfserr_resource;
2174 p = xdr_reserve_space(xdr, 4);
2175 if (!p)
2176 goto out_free;
2177 *p++ = cpu_to_be32(ncomponents);
2178
2179 while (ncomponents) {
2180 struct dentry *dentry = components[ncomponents - 1];
2181 unsigned int len;
2182
2183 spin_lock(&dentry->d_lock);
2184 len = dentry->d_name.len;
2185 p = xdr_reserve_space(xdr, len + 4);
2186 if (!p) {
2187 spin_unlock(&dentry->d_lock);
2188 goto out_free;
2189 }
2190 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2191 dprintk("/%pd", dentry);
2192 spin_unlock(&dentry->d_lock);
2193 dput(dentry);
2194 ncomponents--;
2195 }
2196
2197 err = 0;
2198 out_free:
2199 dprintk(")\n");
2200 while (ncomponents)
2201 dput(components[--ncomponents]);
2202 kfree(components);
2203 path_put(&cur);
2204 return err;
2205 }
2206
2207 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2208 struct svc_rqst *rqstp, const struct path *path)
2209 {
2210 struct svc_export *exp_ps;
2211 __be32 res;
2212
2213 exp_ps = rqst_find_fsidzero_export(rqstp);
2214 if (IS_ERR(exp_ps))
2215 return nfserrno(PTR_ERR(exp_ps));
2216 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2217 exp_put(exp_ps);
2218 return res;
2219 }
2220
2221 /*
2222 * encode a fs_locations structure
2223 */
2224 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2225 struct svc_rqst *rqstp, struct svc_export *exp)
2226 {
2227 __be32 status;
2228 int i;
2229 __be32 *p;
2230 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2231
2232 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2233 if (status)
2234 return status;
2235 p = xdr_reserve_space(xdr, 4);
2236 if (!p)
2237 return nfserr_resource;
2238 *p++ = cpu_to_be32(fslocs->locations_count);
2239 for (i=0; i<fslocs->locations_count; i++) {
2240 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2241 if (status)
2242 return status;
2243 }
2244 return 0;
2245 }
2246
2247 static u32 nfs4_file_type(umode_t mode)
2248 {
2249 switch (mode & S_IFMT) {
2250 case S_IFIFO: return NF4FIFO;
2251 case S_IFCHR: return NF4CHR;
2252 case S_IFDIR: return NF4DIR;
2253 case S_IFBLK: return NF4BLK;
2254 case S_IFLNK: return NF4LNK;
2255 case S_IFREG: return NF4REG;
2256 case S_IFSOCK: return NF4SOCK;
2257 default: return NF4BAD;
2258 };
2259 }
2260
2261 static inline __be32
2262 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2263 struct nfs4_ace *ace)
2264 {
2265 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2266 return nfs4_acl_write_who(xdr, ace->whotype);
2267 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2268 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2269 else
2270 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2271 }
2272
2273 static inline __be32
2274 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2275 {
2276 __be32 *p;
2277 unsigned long i = hweight_long(layout_types);
2278
2279 p = xdr_reserve_space(xdr, 4 + 4 * i);
2280 if (!p)
2281 return nfserr_resource;
2282
2283 *p++ = cpu_to_be32(i);
2284
2285 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2286 if (layout_types & (1 << i))
2287 *p++ = cpu_to_be32(i);
2288
2289 return 0;
2290 }
2291
2292 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2293 FATTR4_WORD0_RDATTR_ERROR)
2294 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2295 #define WORD2_ABSENT_FS_ATTRS 0
2296
2297 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2298 static inline __be32
2299 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2300 void *context, int len)
2301 {
2302 __be32 *p;
2303
2304 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2305 if (!p)
2306 return nfserr_resource;
2307
2308 /*
2309 * For now we use a 0 here to indicate the null translation; in
2310 * the future we may place a call to translation code here.
2311 */
2312 *p++ = cpu_to_be32(0); /* lfs */
2313 *p++ = cpu_to_be32(0); /* pi */
2314 p = xdr_encode_opaque(p, context, len);
2315 return 0;
2316 }
2317 #else
2318 static inline __be32
2319 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2320 void *context, int len)
2321 { return 0; }
2322 #endif
2323
2324 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2325 {
2326 /* As per referral draft: */
2327 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2328 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2329 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2330 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2331 *rdattr_err = NFSERR_MOVED;
2332 else
2333 return nfserr_moved;
2334 }
2335 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2336 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2337 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2338 return 0;
2339 }
2340
2341
2342 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2343 {
2344 struct path path = exp->ex_path;
2345 int err;
2346
2347 path_get(&path);
2348 while (follow_up(&path)) {
2349 if (path.dentry != path.mnt->mnt_root)
2350 break;
2351 }
2352 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2353 path_put(&path);
2354 return err;
2355 }
2356
2357 static __be32
2358 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2359 {
2360 __be32 *p;
2361
2362 if (bmval2) {
2363 p = xdr_reserve_space(xdr, 16);
2364 if (!p)
2365 goto out_resource;
2366 *p++ = cpu_to_be32(3);
2367 *p++ = cpu_to_be32(bmval0);
2368 *p++ = cpu_to_be32(bmval1);
2369 *p++ = cpu_to_be32(bmval2);
2370 } else if (bmval1) {
2371 p = xdr_reserve_space(xdr, 12);
2372 if (!p)
2373 goto out_resource;
2374 *p++ = cpu_to_be32(2);
2375 *p++ = cpu_to_be32(bmval0);
2376 *p++ = cpu_to_be32(bmval1);
2377 } else {
2378 p = xdr_reserve_space(xdr, 8);
2379 if (!p)
2380 goto out_resource;
2381 *p++ = cpu_to_be32(1);
2382 *p++ = cpu_to_be32(bmval0);
2383 }
2384
2385 return 0;
2386 out_resource:
2387 return nfserr_resource;
2388 }
2389
2390 /*
2391 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2392 * ourselves.
2393 */
2394 static __be32
2395 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2396 struct svc_export *exp,
2397 struct dentry *dentry, u32 *bmval,
2398 struct svc_rqst *rqstp, int ignore_crossmnt)
2399 {
2400 u32 bmval0 = bmval[0];
2401 u32 bmval1 = bmval[1];
2402 u32 bmval2 = bmval[2];
2403 struct kstat stat;
2404 struct svc_fh *tempfh = NULL;
2405 struct kstatfs statfs;
2406 __be32 *p;
2407 int starting_len = xdr->buf->len;
2408 int attrlen_offset;
2409 __be32 attrlen;
2410 u32 dummy;
2411 u64 dummy64;
2412 u32 rdattr_err = 0;
2413 __be32 status;
2414 int err;
2415 struct nfs4_acl *acl = NULL;
2416 void *context = NULL;
2417 int contextlen;
2418 bool contextsupport = false;
2419 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2420 u32 minorversion = resp->cstate.minorversion;
2421 struct path path = {
2422 .mnt = exp->ex_path.mnt,
2423 .dentry = dentry,
2424 };
2425 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2426
2427 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2428 BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2429
2430 if (exp->ex_fslocs.migrated) {
2431 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2432 if (status)
2433 goto out;
2434 }
2435
2436 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2437 if (err)
2438 goto out_nfserr;
2439 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2440 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2441 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2442 FATTR4_WORD1_SPACE_TOTAL))) {
2443 err = vfs_statfs(&path, &statfs);
2444 if (err)
2445 goto out_nfserr;
2446 }
2447 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2448 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2449 status = nfserr_jukebox;
2450 if (!tempfh)
2451 goto out;
2452 fh_init(tempfh, NFS4_FHSIZE);
2453 status = fh_compose(tempfh, exp, dentry, NULL);
2454 if (status)
2455 goto out;
2456 fhp = tempfh;
2457 }
2458 if (bmval0 & FATTR4_WORD0_ACL) {
2459 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2460 if (err == -EOPNOTSUPP)
2461 bmval0 &= ~FATTR4_WORD0_ACL;
2462 else if (err == -EINVAL) {
2463 status = nfserr_attrnotsupp;
2464 goto out;
2465 } else if (err != 0)
2466 goto out_nfserr;
2467 }
2468
2469 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2470 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2471 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2472 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2473 err = security_inode_getsecctx(d_inode(dentry),
2474 &context, &contextlen);
2475 else
2476 err = -EOPNOTSUPP;
2477 contextsupport = (err == 0);
2478 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2479 if (err == -EOPNOTSUPP)
2480 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2481 else if (err)
2482 goto out_nfserr;
2483 }
2484 }
2485 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2486
2487 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2488 if (status)
2489 goto out;
2490
2491 attrlen_offset = xdr->buf->len;
2492 p = xdr_reserve_space(xdr, 4);
2493 if (!p)
2494 goto out_resource;
2495 p++; /* to be backfilled later */
2496
2497 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2498 u32 supp[3];
2499
2500 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2501
2502 if (!IS_POSIXACL(dentry->d_inode))
2503 supp[0] &= ~FATTR4_WORD0_ACL;
2504 if (!contextsupport)
2505 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2506 if (!supp[2]) {
2507 p = xdr_reserve_space(xdr, 12);
2508 if (!p)
2509 goto out_resource;
2510 *p++ = cpu_to_be32(2);
2511 *p++ = cpu_to_be32(supp[0]);
2512 *p++ = cpu_to_be32(supp[1]);
2513 } else {
2514 p = xdr_reserve_space(xdr, 16);
2515 if (!p)
2516 goto out_resource;
2517 *p++ = cpu_to_be32(3);
2518 *p++ = cpu_to_be32(supp[0]);
2519 *p++ = cpu_to_be32(supp[1]);
2520 *p++ = cpu_to_be32(supp[2]);
2521 }
2522 }
2523 if (bmval0 & FATTR4_WORD0_TYPE) {
2524 p = xdr_reserve_space(xdr, 4);
2525 if (!p)
2526 goto out_resource;
2527 dummy = nfs4_file_type(stat.mode);
2528 if (dummy == NF4BAD) {
2529 status = nfserr_serverfault;
2530 goto out;
2531 }
2532 *p++ = cpu_to_be32(dummy);
2533 }
2534 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2535 p = xdr_reserve_space(xdr, 4);
2536 if (!p)
2537 goto out_resource;
2538 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2539 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2540 else
2541 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2542 NFS4_FH_VOL_RENAME);
2543 }
2544 if (bmval0 & FATTR4_WORD0_CHANGE) {
2545 p = xdr_reserve_space(xdr, 8);
2546 if (!p)
2547 goto out_resource;
2548 p = encode_change(p, &stat, d_inode(dentry), exp);
2549 }
2550 if (bmval0 & FATTR4_WORD0_SIZE) {
2551 p = xdr_reserve_space(xdr, 8);
2552 if (!p)
2553 goto out_resource;
2554 p = xdr_encode_hyper(p, stat.size);
2555 }
2556 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2557 p = xdr_reserve_space(xdr, 4);
2558 if (!p)
2559 goto out_resource;
2560 *p++ = cpu_to_be32(1);
2561 }
2562 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2563 p = xdr_reserve_space(xdr, 4);
2564 if (!p)
2565 goto out_resource;
2566 *p++ = cpu_to_be32(1);
2567 }
2568 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2569 p = xdr_reserve_space(xdr, 4);
2570 if (!p)
2571 goto out_resource;
2572 *p++ = cpu_to_be32(0);
2573 }
2574 if (bmval0 & FATTR4_WORD0_FSID) {
2575 p = xdr_reserve_space(xdr, 16);
2576 if (!p)
2577 goto out_resource;
2578 if (exp->ex_fslocs.migrated) {
2579 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2580 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2581 } else switch(fsid_source(fhp)) {
2582 case FSIDSOURCE_FSID:
2583 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2584 p = xdr_encode_hyper(p, (u64)0);
2585 break;
2586 case FSIDSOURCE_DEV:
2587 *p++ = cpu_to_be32(0);
2588 *p++ = cpu_to_be32(MAJOR(stat.dev));
2589 *p++ = cpu_to_be32(0);
2590 *p++ = cpu_to_be32(MINOR(stat.dev));
2591 break;
2592 case FSIDSOURCE_UUID:
2593 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2594 EX_UUID_LEN);
2595 break;
2596 }
2597 }
2598 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2599 p = xdr_reserve_space(xdr, 4);
2600 if (!p)
2601 goto out_resource;
2602 *p++ = cpu_to_be32(0);
2603 }
2604 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2605 p = xdr_reserve_space(xdr, 4);
2606 if (!p)
2607 goto out_resource;
2608 *p++ = cpu_to_be32(nn->nfsd4_lease);
2609 }
2610 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2611 p = xdr_reserve_space(xdr, 4);
2612 if (!p)
2613 goto out_resource;
2614 *p++ = cpu_to_be32(rdattr_err);
2615 }
2616 if (bmval0 & FATTR4_WORD0_ACL) {
2617 struct nfs4_ace *ace;
2618
2619 if (acl == NULL) {
2620 p = xdr_reserve_space(xdr, 4);
2621 if (!p)
2622 goto out_resource;
2623
2624 *p++ = cpu_to_be32(0);
2625 goto out_acl;
2626 }
2627 p = xdr_reserve_space(xdr, 4);
2628 if (!p)
2629 goto out_resource;
2630 *p++ = cpu_to_be32(acl->naces);
2631
2632 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2633 p = xdr_reserve_space(xdr, 4*3);
2634 if (!p)
2635 goto out_resource;
2636 *p++ = cpu_to_be32(ace->type);
2637 *p++ = cpu_to_be32(ace->flag);
2638 *p++ = cpu_to_be32(ace->access_mask &
2639 NFS4_ACE_MASK_ALL);
2640 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2641 if (status)
2642 goto out;
2643 }
2644 }
2645 out_acl:
2646 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2647 p = xdr_reserve_space(xdr, 4);
2648 if (!p)
2649 goto out_resource;
2650 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2651 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2652 }
2653 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2654 p = xdr_reserve_space(xdr, 4);
2655 if (!p)
2656 goto out_resource;
2657 *p++ = cpu_to_be32(1);
2658 }
2659 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2660 p = xdr_reserve_space(xdr, 4);
2661 if (!p)
2662 goto out_resource;
2663 *p++ = cpu_to_be32(0);
2664 }
2665 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2666 p = xdr_reserve_space(xdr, 4);
2667 if (!p)
2668 goto out_resource;
2669 *p++ = cpu_to_be32(1);
2670 }
2671 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2672 p = xdr_reserve_space(xdr, 4);
2673 if (!p)
2674 goto out_resource;
2675 *p++ = cpu_to_be32(1);
2676 }
2677 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2678 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2679 if (!p)
2680 goto out_resource;
2681 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2682 fhp->fh_handle.fh_size);
2683 }
2684 if (bmval0 & FATTR4_WORD0_FILEID) {
2685 p = xdr_reserve_space(xdr, 8);
2686 if (!p)
2687 goto out_resource;
2688 p = xdr_encode_hyper(p, stat.ino);
2689 }
2690 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2691 p = xdr_reserve_space(xdr, 8);
2692 if (!p)
2693 goto out_resource;
2694 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2695 }
2696 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2697 p = xdr_reserve_space(xdr, 8);
2698 if (!p)
2699 goto out_resource;
2700 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2701 }
2702 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2703 p = xdr_reserve_space(xdr, 8);
2704 if (!p)
2705 goto out_resource;
2706 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2707 }
2708 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2709 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2710 if (status)
2711 goto out;
2712 }
2713 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2714 p = xdr_reserve_space(xdr, 4);
2715 if (!p)
2716 goto out_resource;
2717 *p++ = cpu_to_be32(1);
2718 }
2719 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2720 p = xdr_reserve_space(xdr, 8);
2721 if (!p)
2722 goto out_resource;
2723 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2724 }
2725 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2726 p = xdr_reserve_space(xdr, 4);
2727 if (!p)
2728 goto out_resource;
2729 *p++ = cpu_to_be32(255);
2730 }
2731 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2732 p = xdr_reserve_space(xdr, 4);
2733 if (!p)
2734 goto out_resource;
2735 *p++ = cpu_to_be32(statfs.f_namelen);
2736 }
2737 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2738 p = xdr_reserve_space(xdr, 8);
2739 if (!p)
2740 goto out_resource;
2741 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2742 }
2743 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2744 p = xdr_reserve_space(xdr, 8);
2745 if (!p)
2746 goto out_resource;
2747 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2748 }
2749 if (bmval1 & FATTR4_WORD1_MODE) {
2750 p = xdr_reserve_space(xdr, 4);
2751 if (!p)
2752 goto out_resource;
2753 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2754 }
2755 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2756 p = xdr_reserve_space(xdr, 4);
2757 if (!p)
2758 goto out_resource;
2759 *p++ = cpu_to_be32(1);
2760 }
2761 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2762 p = xdr_reserve_space(xdr, 4);
2763 if (!p)
2764 goto out_resource;
2765 *p++ = cpu_to_be32(stat.nlink);
2766 }
2767 if (bmval1 & FATTR4_WORD1_OWNER) {
2768 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2769 if (status)
2770 goto out;
2771 }
2772 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2773 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2774 if (status)
2775 goto out;
2776 }
2777 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2778 p = xdr_reserve_space(xdr, 8);
2779 if (!p)
2780 goto out_resource;
2781 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2782 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2783 }
2784 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2785 p = xdr_reserve_space(xdr, 8);
2786 if (!p)
2787 goto out_resource;
2788 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2789 p = xdr_encode_hyper(p, dummy64);
2790 }
2791 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2792 p = xdr_reserve_space(xdr, 8);
2793 if (!p)
2794 goto out_resource;
2795 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2796 p = xdr_encode_hyper(p, dummy64);
2797 }
2798 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2799 p = xdr_reserve_space(xdr, 8);
2800 if (!p)
2801 goto out_resource;
2802 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2803 p = xdr_encode_hyper(p, dummy64);
2804 }
2805 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2806 p = xdr_reserve_space(xdr, 8);
2807 if (!p)
2808 goto out_resource;
2809 dummy64 = (u64)stat.blocks << 9;
2810 p = xdr_encode_hyper(p, dummy64);
2811 }
2812 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2813 p = xdr_reserve_space(xdr, 12);
2814 if (!p)
2815 goto out_resource;
2816 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2817 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2818 }
2819 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2820 p = xdr_reserve_space(xdr, 12);
2821 if (!p)
2822 goto out_resource;
2823 p = encode_time_delta(p, d_inode(dentry));
2824 }
2825 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2826 p = xdr_reserve_space(xdr, 12);
2827 if (!p)
2828 goto out_resource;
2829 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2830 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2831 }
2832 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2833 p = xdr_reserve_space(xdr, 12);
2834 if (!p)
2835 goto out_resource;
2836 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2837 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2838 }
2839 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2840 struct kstat parent_stat;
2841 u64 ino = stat.ino;
2842
2843 p = xdr_reserve_space(xdr, 8);
2844 if (!p)
2845 goto out_resource;
2846 /*
2847 * Get parent's attributes if not ignoring crossmount
2848 * and this is the root of a cross-mounted filesystem.
2849 */
2850 if (ignore_crossmnt == 0 &&
2851 dentry == exp->ex_path.mnt->mnt_root) {
2852 err = get_parent_attributes(exp, &parent_stat);
2853 if (err)
2854 goto out_nfserr;
2855 ino = parent_stat.ino;
2856 }
2857 p = xdr_encode_hyper(p, ino);
2858 }
2859 #ifdef CONFIG_NFSD_PNFS
2860 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2861 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2862 if (status)
2863 goto out;
2864 }
2865
2866 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2867 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2868 if (status)
2869 goto out;
2870 }
2871
2872 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2873 p = xdr_reserve_space(xdr, 4);
2874 if (!p)
2875 goto out_resource;
2876 *p++ = cpu_to_be32(stat.blksize);
2877 }
2878 #endif /* CONFIG_NFSD_PNFS */
2879 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2880 u32 supp[3];
2881
2882 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2883 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2884 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2885 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2886
2887 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2888 if (status)
2889 goto out;
2890 }
2891
2892 if (bmval2 & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
2893 p = xdr_reserve_space(xdr, 4);
2894 if (!p)
2895 goto out_resource;
2896 if (IS_I_VERSION(d_inode(dentry)))
2897 *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR);
2898 else
2899 *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_TIME_METADATA);
2900 }
2901
2902 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2903 status = nfsd4_encode_security_label(xdr, rqstp, context,
2904 contextlen);
2905 if (status)
2906 goto out;
2907 }
2908
2909 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2910 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2911 status = nfs_ok;
2912
2913 out:
2914 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2915 if (context)
2916 security_release_secctx(context, contextlen);
2917 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2918 kfree(acl);
2919 if (tempfh) {
2920 fh_put(tempfh);
2921 kfree(tempfh);
2922 }
2923 if (status)
2924 xdr_truncate_encode(xdr, starting_len);
2925 return status;
2926 out_nfserr:
2927 status = nfserrno(err);
2928 goto out;
2929 out_resource:
2930 status = nfserr_resource;
2931 goto out;
2932 }
2933
2934 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2935 struct xdr_buf *buf, __be32 *p, int bytes)
2936 {
2937 xdr->scratch.iov_len = 0;
2938 memset(buf, 0, sizeof(struct xdr_buf));
2939 buf->head[0].iov_base = p;
2940 buf->head[0].iov_len = 0;
2941 buf->len = 0;
2942 xdr->buf = buf;
2943 xdr->iov = buf->head;
2944 xdr->p = p;
2945 xdr->end = (void *)p + bytes;
2946 buf->buflen = bytes;
2947 }
2948
2949 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2950 struct svc_fh *fhp, struct svc_export *exp,
2951 struct dentry *dentry, u32 *bmval,
2952 struct svc_rqst *rqstp, int ignore_crossmnt)
2953 {
2954 struct xdr_buf dummy;
2955 struct xdr_stream xdr;
2956 __be32 ret;
2957
2958 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2959 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2960 ignore_crossmnt);
2961 *p = xdr.p;
2962 return ret;
2963 }
2964
2965 static inline int attributes_need_mount(u32 *bmval)
2966 {
2967 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2968 return 1;
2969 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2970 return 1;
2971 return 0;
2972 }
2973
2974 static __be32
2975 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2976 const char *name, int namlen)
2977 {
2978 struct svc_export *exp = cd->rd_fhp->fh_export;
2979 struct dentry *dentry;
2980 __be32 nfserr;
2981 int ignore_crossmnt = 0;
2982
2983 dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2984 if (IS_ERR(dentry))
2985 return nfserrno(PTR_ERR(dentry));
2986 if (d_really_is_negative(dentry)) {
2987 /*
2988 * we're not holding the i_mutex here, so there's
2989 * a window where this directory entry could have gone
2990 * away.
2991 */
2992 dput(dentry);
2993 return nfserr_noent;
2994 }
2995
2996 exp_get(exp);
2997 /*
2998 * In the case of a mountpoint, the client may be asking for
2999 * attributes that are only properties of the underlying filesystem
3000 * as opposed to the cross-mounted file system. In such a case,
3001 * we will not follow the cross mount and will fill the attribtutes
3002 * directly from the mountpoint dentry.
3003 */
3004 if (nfsd_mountpoint(dentry, exp)) {
3005 int err;
3006
3007 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3008 && !attributes_need_mount(cd->rd_bmval)) {
3009 ignore_crossmnt = 1;
3010 goto out_encode;
3011 }
3012 /*
3013 * Why the heck aren't we just using nfsd_lookup??
3014 * Different "."/".." handling? Something else?
3015 * At least, add a comment here to explain....
3016 */
3017 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3018 if (err) {
3019 nfserr = nfserrno(err);
3020 goto out_put;
3021 }
3022 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3023 if (nfserr)
3024 goto out_put;
3025
3026 }
3027 out_encode:
3028 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3029 cd->rd_rqstp, ignore_crossmnt);
3030 out_put:
3031 dput(dentry);
3032 exp_put(exp);
3033 return nfserr;
3034 }
3035
3036 static __be32 *
3037 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3038 {
3039 __be32 *p;
3040
3041 p = xdr_reserve_space(xdr, 20);
3042 if (!p)
3043 return NULL;
3044 *p++ = htonl(2);
3045 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3046 *p++ = htonl(0); /* bmval1 */
3047
3048 *p++ = htonl(4); /* attribute length */
3049 *p++ = nfserr; /* no htonl */
3050 return p;
3051 }
3052
3053 static int
3054 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3055 loff_t offset, u64 ino, unsigned int d_type)
3056 {
3057 struct readdir_cd *ccd = ccdv;
3058 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3059 struct xdr_stream *xdr = cd->xdr;
3060 int start_offset = xdr->buf->len;
3061 int cookie_offset;
3062 u32 name_and_cookie;
3063 int entry_bytes;
3064 __be32 nfserr = nfserr_toosmall;
3065 __be64 wire_offset;
3066 __be32 *p;
3067
3068 /* In nfsv4, "." and ".." never make it onto the wire.. */
3069 if (name && isdotent(name, namlen)) {
3070 cd->common.err = nfs_ok;
3071 return 0;
3072 }
3073
3074 if (cd->cookie_offset) {
3075 wire_offset = cpu_to_be64(offset);
3076 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3077 &wire_offset, 8);
3078 }
3079
3080 p = xdr_reserve_space(xdr, 4);
3081 if (!p)
3082 goto fail;
3083 *p++ = xdr_one; /* mark entry present */
3084 cookie_offset = xdr->buf->len;
3085 p = xdr_reserve_space(xdr, 3*4 + namlen);
3086 if (!p)
3087 goto fail;
3088 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
3089 p = xdr_encode_array(p, name, namlen); /* name length & name */
3090
3091 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3092 switch (nfserr) {
3093 case nfs_ok:
3094 break;
3095 case nfserr_resource:
3096 nfserr = nfserr_toosmall;
3097 goto fail;
3098 case nfserr_noent:
3099 xdr_truncate_encode(xdr, start_offset);
3100 goto skip_entry;
3101 default:
3102 /*
3103 * If the client requested the RDATTR_ERROR attribute,
3104 * we stuff the error code into this attribute
3105 * and continue. If this attribute was not requested,
3106 * then in accordance with the spec, we fail the
3107 * entire READDIR operation(!)
3108 */
3109 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3110 goto fail;
3111 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3112 if (p == NULL) {
3113 nfserr = nfserr_toosmall;
3114 goto fail;
3115 }
3116 }
3117 nfserr = nfserr_toosmall;
3118 entry_bytes = xdr->buf->len - start_offset;
3119 if (entry_bytes > cd->rd_maxcount)
3120 goto fail;
3121 cd->rd_maxcount -= entry_bytes;
3122 /*
3123 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3124 * let's always let through the first entry, at least:
3125 */
3126 if (!cd->rd_dircount)
3127 goto fail;
3128 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3129 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3130 goto fail;
3131 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3132
3133 cd->cookie_offset = cookie_offset;
3134 skip_entry:
3135 cd->common.err = nfs_ok;
3136 return 0;
3137 fail:
3138 xdr_truncate_encode(xdr, start_offset);
3139 cd->common.err = nfserr;
3140 return -EINVAL;
3141 }
3142
3143 static __be32
3144 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3145 {
3146 __be32 *p;
3147
3148 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3149 if (!p)
3150 return nfserr_resource;
3151 *p++ = cpu_to_be32(sid->si_generation);
3152 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3153 sizeof(stateid_opaque_t));
3154 return 0;
3155 }
3156
3157 static __be32
3158 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3159 {
3160 struct xdr_stream *xdr = &resp->xdr;
3161 __be32 *p;
3162
3163 p = xdr_reserve_space(xdr, 8);
3164 if (!p)
3165 return nfserr_resource;
3166 *p++ = cpu_to_be32(access->ac_supported);
3167 *p++ = cpu_to_be32(access->ac_resp_access);
3168 return 0;
3169 }
3170
3171 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3172 {
3173 struct xdr_stream *xdr = &resp->xdr;
3174 __be32 *p;
3175
3176 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3177 if (!p)
3178 return nfserr_resource;
3179 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3180 NFS4_MAX_SESSIONID_LEN);
3181 *p++ = cpu_to_be32(bcts->dir);
3182 /* Upshifting from TCP to RDMA is not supported */
3183 *p++ = cpu_to_be32(0);
3184 return 0;
3185 }
3186
3187 static __be32
3188 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3189 {
3190 struct xdr_stream *xdr = &resp->xdr;
3191
3192 return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3193 }
3194
3195
3196 static __be32
3197 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3198 {
3199 struct xdr_stream *xdr = &resp->xdr;
3200 __be32 *p;
3201
3202 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3203 if (!p)
3204 return nfserr_resource;
3205 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3206 NFS4_VERIFIER_SIZE);
3207 return 0;
3208 }
3209
3210 static __be32
3211 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3212 {
3213 struct xdr_stream *xdr = &resp->xdr;
3214 __be32 *p;
3215
3216 p = xdr_reserve_space(xdr, 20);
3217 if (!p)
3218 return nfserr_resource;
3219 encode_cinfo(p, &create->cr_cinfo);
3220 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3221 create->cr_bmval[1], create->cr_bmval[2]);
3222 return 0;
3223 }
3224
3225 static __be32
3226 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3227 {
3228 struct svc_fh *fhp = getattr->ga_fhp;
3229 struct xdr_stream *xdr = &resp->xdr;
3230
3231 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3232 getattr->ga_bmval, resp->rqstp, 0);
3233 }
3234
3235 static __be32
3236 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3237 {
3238 struct xdr_stream *xdr = &resp->xdr;
3239 struct svc_fh *fhp = *fhpp;
3240 unsigned int len;
3241 __be32 *p;
3242
3243 len = fhp->fh_handle.fh_size;
3244 p = xdr_reserve_space(xdr, len + 4);
3245 if (!p)
3246 return nfserr_resource;
3247 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3248 return 0;
3249 }
3250
3251 /*
3252 * Including all fields other than the name, a LOCK4denied structure requires
3253 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3254 */
3255 static __be32
3256 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3257 {
3258 struct xdr_netobj *conf = &ld->ld_owner;
3259 __be32 *p;
3260
3261 again:
3262 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3263 if (!p) {
3264 /*
3265 * Don't fail to return the result just because we can't
3266 * return the conflicting open:
3267 */
3268 if (conf->len) {
3269 kfree(conf->data);
3270 conf->len = 0;
3271 conf->data = NULL;
3272 goto again;
3273 }
3274 return nfserr_resource;
3275 }
3276 p = xdr_encode_hyper(p, ld->ld_start);
3277 p = xdr_encode_hyper(p, ld->ld_length);
3278 *p++ = cpu_to_be32(ld->ld_type);
3279 if (conf->len) {
3280 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3281 p = xdr_encode_opaque(p, conf->data, conf->len);
3282 kfree(conf->data);
3283 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
3284 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3285 *p++ = cpu_to_be32(0); /* length of owner name */
3286 }
3287 return nfserr_denied;
3288 }
3289
3290 static __be32
3291 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3292 {
3293 struct xdr_stream *xdr = &resp->xdr;
3294
3295 if (!nfserr)
3296 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3297 else if (nfserr == nfserr_denied)
3298 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3299
3300 return nfserr;
3301 }
3302
3303 static __be32
3304 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3305 {
3306 struct xdr_stream *xdr = &resp->xdr;
3307
3308 if (nfserr == nfserr_denied)
3309 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3310 return nfserr;
3311 }
3312
3313 static __be32
3314 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3315 {
3316 struct xdr_stream *xdr = &resp->xdr;
3317
3318 return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3319 }
3320
3321
3322 static __be32
3323 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3324 {
3325 struct xdr_stream *xdr = &resp->xdr;
3326 __be32 *p;
3327
3328 p = xdr_reserve_space(xdr, 20);
3329 if (!p)
3330 return nfserr_resource;
3331 p = encode_cinfo(p, &link->li_cinfo);
3332 return 0;
3333 }
3334
3335
3336 static __be32
3337 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3338 {
3339 struct xdr_stream *xdr = &resp->xdr;
3340 __be32 *p;
3341
3342 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3343 if (nfserr)
3344 return nfserr;
3345 p = xdr_reserve_space(xdr, 24);
3346 if (!p)
3347 return nfserr_resource;
3348 p = encode_cinfo(p, &open->op_cinfo);
3349 *p++ = cpu_to_be32(open->op_rflags);
3350
3351 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3352 open->op_bmval[2]);
3353 if (nfserr)
3354 return nfserr;
3355
3356 p = xdr_reserve_space(xdr, 4);
3357 if (!p)
3358 return nfserr_resource;
3359
3360 *p++ = cpu_to_be32(open->op_delegate_type);
3361 switch (open->op_delegate_type) {
3362 case NFS4_OPEN_DELEGATE_NONE:
3363 break;
3364 case NFS4_OPEN_DELEGATE_READ:
3365 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3366 if (nfserr)
3367 return nfserr;
3368 p = xdr_reserve_space(xdr, 20);
3369 if (!p)
3370 return nfserr_resource;
3371 *p++ = cpu_to_be32(open->op_recall);
3372
3373 /*
3374 * TODO: ACE's in delegations
3375 */
3376 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3377 *p++ = cpu_to_be32(0);
3378 *p++ = cpu_to_be32(0);
3379 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3380 break;
3381 case NFS4_OPEN_DELEGATE_WRITE:
3382 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3383 if (nfserr)
3384 return nfserr;
3385 p = xdr_reserve_space(xdr, 32);
3386 if (!p)
3387 return nfserr_resource;
3388 *p++ = cpu_to_be32(0);
3389
3390 /*
3391 * TODO: space_limit's in delegations
3392 */
3393 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3394 *p++ = cpu_to_be32(~(u32)0);
3395 *p++ = cpu_to_be32(~(u32)0);
3396
3397 /*
3398 * TODO: ACE's in delegations
3399 */
3400 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3401 *p++ = cpu_to_be32(0);
3402 *p++ = cpu_to_be32(0);
3403 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3404 break;
3405 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3406 switch (open->op_why_no_deleg) {
3407 case WND4_CONTENTION:
3408 case WND4_RESOURCE:
3409 p = xdr_reserve_space(xdr, 8);
3410 if (!p)
3411 return nfserr_resource;
3412 *p++ = cpu_to_be32(open->op_why_no_deleg);
3413 /* deleg signaling not supported yet: */
3414 *p++ = cpu_to_be32(0);
3415 break;
3416 default:
3417 p = xdr_reserve_space(xdr, 4);
3418 if (!p)
3419 return nfserr_resource;
3420 *p++ = cpu_to_be32(open->op_why_no_deleg);
3421 }
3422 break;
3423 default:
3424 BUG();
3425 }
3426 /* XXX save filehandle here */
3427 return 0;
3428 }
3429
3430 static __be32
3431 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3432 {
3433 struct xdr_stream *xdr = &resp->xdr;
3434
3435 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3436 }
3437
3438 static __be32
3439 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3440 {
3441 struct xdr_stream *xdr = &resp->xdr;
3442
3443 return nfsd4_encode_stateid(xdr, &od->od_stateid);
3444 }
3445
3446 static __be32 nfsd4_encode_splice_read(
3447 struct nfsd4_compoundres *resp,
3448 struct nfsd4_read *read,
3449 struct file *file, unsigned long maxcount)
3450 {
3451 struct xdr_stream *xdr = &resp->xdr;
3452 struct xdr_buf *buf = xdr->buf;
3453 u32 eof;
3454 long len;
3455 int space_left;
3456 __be32 nfserr;
3457 __be32 *p = xdr->p - 2;
3458
3459 /* Make sure there will be room for padding if needed */
3460 if (xdr->end - xdr->p < 1)
3461 return nfserr_resource;
3462
3463 len = maxcount;
3464 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3465 file, read->rd_offset, &maxcount);
3466 read->rd_length = maxcount;
3467 if (nfserr) {
3468 /*
3469 * nfsd_splice_actor may have already messed with the
3470 * page length; reset it so as not to confuse
3471 * xdr_truncate_encode:
3472 */
3473 buf->page_len = 0;
3474 return nfserr;
3475 }
3476
3477 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3478 d_inode(read->rd_fhp->fh_dentry)->i_size);
3479
3480 *(p++) = htonl(eof);
3481 *(p++) = htonl(maxcount);
3482
3483 buf->page_len = maxcount;
3484 buf->len += maxcount;
3485 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3486 / PAGE_SIZE;
3487
3488 /* Use rest of head for padding and remaining ops: */
3489 buf->tail[0].iov_base = xdr->p;
3490 buf->tail[0].iov_len = 0;
3491 xdr->iov = buf->tail;
3492 if (maxcount&3) {
3493 int pad = 4 - (maxcount&3);
3494
3495 *(xdr->p++) = 0;
3496
3497 buf->tail[0].iov_base += maxcount&3;
3498 buf->tail[0].iov_len = pad;
3499 buf->len += pad;
3500 }
3501
3502 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3503 buf->buflen - buf->len);
3504 buf->buflen = buf->len + space_left;
3505 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3506
3507 return 0;
3508 }
3509
3510 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3511 struct nfsd4_read *read,
3512 struct file *file, unsigned long maxcount)
3513 {
3514 struct xdr_stream *xdr = &resp->xdr;
3515 u32 eof;
3516 int v;
3517 int starting_len = xdr->buf->len - 8;
3518 long len;
3519 int thislen;
3520 __be32 nfserr;
3521 __be32 tmp;
3522 __be32 *p;
3523 u32 zzz = 0;
3524 int pad;
3525
3526 len = maxcount;
3527 v = 0;
3528
3529 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3530 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3531 WARN_ON_ONCE(!p);
3532 resp->rqstp->rq_vec[v].iov_base = p;
3533 resp->rqstp->rq_vec[v].iov_len = thislen;
3534 v++;
3535 len -= thislen;
3536
3537 while (len) {
3538 thislen = min_t(long, len, PAGE_SIZE);
3539 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3540 WARN_ON_ONCE(!p);
3541 resp->rqstp->rq_vec[v].iov_base = p;
3542 resp->rqstp->rq_vec[v].iov_len = thislen;
3543 v++;
3544 len -= thislen;
3545 }
3546 read->rd_vlen = v;
3547
3548 len = maxcount;
3549 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3550 resp->rqstp->rq_vec, read->rd_vlen, &maxcount);
3551 read->rd_length = maxcount;
3552 if (nfserr)
3553 return nfserr;
3554 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3555
3556 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3557 d_inode(read->rd_fhp->fh_dentry)->i_size);
3558
3559 tmp = htonl(eof);
3560 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3561 tmp = htonl(maxcount);
3562 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3563
3564 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3565 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3566 &zzz, pad);
3567 return 0;
3568
3569 }
3570
3571 static __be32
3572 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3573 struct nfsd4_read *read)
3574 {
3575 unsigned long maxcount;
3576 struct xdr_stream *xdr = &resp->xdr;
3577 struct file *file = read->rd_filp;
3578 int starting_len = xdr->buf->len;
3579 struct raparms *ra = NULL;
3580 __be32 *p;
3581
3582 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3583 if (!p) {
3584 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3585 return nfserr_resource;
3586 }
3587 if (resp->xdr.buf->page_len &&
3588 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3589 WARN_ON_ONCE(1);
3590 return nfserr_resource;
3591 }
3592 xdr_commit_encode(xdr);
3593
3594 maxcount = svc_max_payload(resp->rqstp);
3595 maxcount = min_t(unsigned long, maxcount,
3596 (xdr->buf->buflen - xdr->buf->len));
3597 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3598
3599 if (read->rd_tmp_file)
3600 ra = nfsd_init_raparms(file);
3601
3602 if (file->f_op->splice_read &&
3603 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3604 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3605 else
3606 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3607
3608 if (ra)
3609 nfsd_put_raparams(file, ra);
3610
3611 if (nfserr)
3612 xdr_truncate_encode(xdr, starting_len);
3613
3614 return nfserr;
3615 }
3616
3617 static __be32
3618 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3619 {
3620 int maxcount;
3621 __be32 wire_count;
3622 int zero = 0;
3623 struct xdr_stream *xdr = &resp->xdr;
3624 int length_offset = xdr->buf->len;
3625 __be32 *p;
3626
3627 p = xdr_reserve_space(xdr, 4);
3628 if (!p)
3629 return nfserr_resource;
3630 maxcount = PAGE_SIZE;
3631
3632 p = xdr_reserve_space(xdr, maxcount);
3633 if (!p)
3634 return nfserr_resource;
3635 /*
3636 * XXX: By default, vfs_readlink() will truncate symlinks if they
3637 * would overflow the buffer. Is this kosher in NFSv4? If not, one
3638 * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3639 * that truncation occurred, and return NFS4ERR_RESOURCE.
3640 */
3641 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3642 (char *)p, &maxcount);
3643 if (nfserr == nfserr_isdir)
3644 nfserr = nfserr_inval;
3645 if (nfserr) {
3646 xdr_truncate_encode(xdr, length_offset);
3647 return nfserr;
3648 }
3649
3650 wire_count = htonl(maxcount);
3651 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3652 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3653 if (maxcount & 3)
3654 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3655 &zero, 4 - (maxcount&3));
3656 return 0;
3657 }
3658
3659 static __be32
3660 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3661 {
3662 int maxcount;
3663 int bytes_left;
3664 loff_t offset;
3665 __be64 wire_offset;
3666 struct xdr_stream *xdr = &resp->xdr;
3667 int starting_len = xdr->buf->len;
3668 __be32 *p;
3669
3670 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3671 if (!p)
3672 return nfserr_resource;
3673
3674 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3675 *p++ = cpu_to_be32(0);
3676 *p++ = cpu_to_be32(0);
3677 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3678 - (char *)resp->xdr.buf->head[0].iov_base;
3679
3680 /*
3681 * Number of bytes left for directory entries allowing for the
3682 * final 8 bytes of the readdir and a following failed op:
3683 */
3684 bytes_left = xdr->buf->buflen - xdr->buf->len
3685 - COMPOUND_ERR_SLACK_SPACE - 8;
3686 if (bytes_left < 0) {
3687 nfserr = nfserr_resource;
3688 goto err_no_verf;
3689 }
3690 maxcount = svc_max_payload(resp->rqstp);
3691 maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3692 /*
3693 * Note the rfc defines rd_maxcount as the size of the
3694 * READDIR4resok structure, which includes the verifier above
3695 * and the 8 bytes encoded at the end of this function:
3696 */
3697 if (maxcount < 16) {
3698 nfserr = nfserr_toosmall;
3699 goto err_no_verf;
3700 }
3701 maxcount = min_t(int, maxcount-16, bytes_left);
3702
3703 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3704 if (!readdir->rd_dircount)
3705 readdir->rd_dircount = svc_max_payload(resp->rqstp);
3706
3707 readdir->xdr = xdr;
3708 readdir->rd_maxcount = maxcount;
3709 readdir->common.err = 0;
3710 readdir->cookie_offset = 0;
3711
3712 offset = readdir->rd_cookie;
3713 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3714 &offset,
3715 &readdir->common, nfsd4_encode_dirent);
3716 if (nfserr == nfs_ok &&
3717 readdir->common.err == nfserr_toosmall &&
3718 xdr->buf->len == starting_len + 8) {
3719 /* nothing encoded; which limit did we hit?: */
3720 if (maxcount - 16 < bytes_left)
3721 /* It was the fault of rd_maxcount: */
3722 nfserr = nfserr_toosmall;
3723 else
3724 /* We ran out of buffer space: */
3725 nfserr = nfserr_resource;
3726 }
3727 if (nfserr)
3728 goto err_no_verf;
3729
3730 if (readdir->cookie_offset) {
3731 wire_offset = cpu_to_be64(offset);
3732 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3733 &wire_offset, 8);
3734 }
3735
3736 p = xdr_reserve_space(xdr, 8);
3737 if (!p) {
3738 WARN_ON_ONCE(1);
3739 goto err_no_verf;
3740 }
3741 *p++ = 0; /* no more entries */
3742 *p++ = htonl(readdir->common.err == nfserr_eof);
3743
3744 return 0;
3745 err_no_verf:
3746 xdr_truncate_encode(xdr, starting_len);
3747 return nfserr;
3748 }
3749
3750 static __be32
3751 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3752 {
3753 struct xdr_stream *xdr = &resp->xdr;
3754 __be32 *p;
3755
3756 p = xdr_reserve_space(xdr, 20);
3757 if (!p)
3758 return nfserr_resource;
3759 p = encode_cinfo(p, &remove->rm_cinfo);
3760 return 0;
3761 }
3762
3763 static __be32
3764 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3765 {
3766 struct xdr_stream *xdr = &resp->xdr;
3767 __be32 *p;
3768
3769 p = xdr_reserve_space(xdr, 40);
3770 if (!p)
3771 return nfserr_resource;
3772 p = encode_cinfo(p, &rename->rn_sinfo);
3773 p = encode_cinfo(p, &rename->rn_tinfo);
3774 return 0;
3775 }
3776
3777 static __be32
3778 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
3779 {
3780 u32 i, nflavs, supported;
3781 struct exp_flavor_info *flavs;
3782 struct exp_flavor_info def_flavs[2];
3783 __be32 *p, *flavorsp;
3784 static bool report = true;
3785
3786 if (exp->ex_nflavors) {
3787 flavs = exp->ex_flavors;
3788 nflavs = exp->ex_nflavors;
3789 } else { /* Handling of some defaults in absence of real secinfo: */
3790 flavs = def_flavs;
3791 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3792 nflavs = 2;
3793 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3794 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3795 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3796 nflavs = 1;
3797 flavs[0].pseudoflavor
3798 = svcauth_gss_flavor(exp->ex_client);
3799 } else {
3800 nflavs = 1;
3801 flavs[0].pseudoflavor
3802 = exp->ex_client->flavour->flavour;
3803 }
3804 }
3805
3806 supported = 0;
3807 p = xdr_reserve_space(xdr, 4);
3808 if (!p)
3809 return nfserr_resource;
3810 flavorsp = p++; /* to be backfilled later */
3811
3812 for (i = 0; i < nflavs; i++) {
3813 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3814 struct rpcsec_gss_info info;
3815
3816 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3817 supported++;
3818 p = xdr_reserve_space(xdr, 4 + 4 +
3819 XDR_LEN(info.oid.len) + 4 + 4);
3820 if (!p)
3821 return nfserr_resource;
3822 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3823 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3824 *p++ = cpu_to_be32(info.qop);
3825 *p++ = cpu_to_be32(info.service);
3826 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3827 supported++;
3828 p = xdr_reserve_space(xdr, 4);
3829 if (!p)
3830 return nfserr_resource;
3831 *p++ = cpu_to_be32(pf);
3832 } else {
3833 if (report)
3834 pr_warn("NFS: SECINFO: security flavor %u "
3835 "is not supported\n", pf);
3836 }
3837 }
3838
3839 if (nflavs != supported)
3840 report = false;
3841 *flavorsp = htonl(supported);
3842 return 0;
3843 }
3844
3845 static __be32
3846 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3847 struct nfsd4_secinfo *secinfo)
3848 {
3849 struct xdr_stream *xdr = &resp->xdr;
3850
3851 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
3852 }
3853
3854 static __be32
3855 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3856 struct nfsd4_secinfo_no_name *secinfo)
3857 {
3858 struct xdr_stream *xdr = &resp->xdr;
3859
3860 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
3861 }
3862
3863 /*
3864 * The SETATTR encode routine is special -- it always encodes a bitmap,
3865 * regardless of the error status.
3866 */
3867 static __be32
3868 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3869 {
3870 struct xdr_stream *xdr = &resp->xdr;
3871 __be32 *p;
3872
3873 p = xdr_reserve_space(xdr, 16);
3874 if (!p)
3875 return nfserr_resource;
3876 if (nfserr) {
3877 *p++ = cpu_to_be32(3);
3878 *p++ = cpu_to_be32(0);
3879 *p++ = cpu_to_be32(0);
3880 *p++ = cpu_to_be32(0);
3881 }
3882 else {
3883 *p++ = cpu_to_be32(3);
3884 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3885 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3886 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3887 }
3888 return nfserr;
3889 }
3890
3891 static __be32
3892 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3893 {
3894 struct xdr_stream *xdr = &resp->xdr;
3895 __be32 *p;
3896
3897 if (!nfserr) {
3898 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3899 if (!p)
3900 return nfserr_resource;
3901 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3902 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3903 NFS4_VERIFIER_SIZE);
3904 }
3905 else if (nfserr == nfserr_clid_inuse) {
3906 p = xdr_reserve_space(xdr, 8);
3907 if (!p)
3908 return nfserr_resource;
3909 *p++ = cpu_to_be32(0);
3910 *p++ = cpu_to_be32(0);
3911 }
3912 return nfserr;
3913 }
3914
3915 static __be32
3916 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3917 {
3918 struct xdr_stream *xdr = &resp->xdr;
3919 __be32 *p;
3920
3921 p = xdr_reserve_space(xdr, 16);
3922 if (!p)
3923 return nfserr_resource;
3924 *p++ = cpu_to_be32(write->wr_bytes_written);
3925 *p++ = cpu_to_be32(write->wr_how_written);
3926 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3927 NFS4_VERIFIER_SIZE);
3928 return 0;
3929 }
3930
3931 static __be32
3932 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3933 struct nfsd4_exchange_id *exid)
3934 {
3935 struct xdr_stream *xdr = &resp->xdr;
3936 __be32 *p;
3937 char *major_id;
3938 char *server_scope;
3939 int major_id_sz;
3940 int server_scope_sz;
3941 uint64_t minor_id = 0;
3942
3943 major_id = utsname()->nodename;
3944 major_id_sz = strlen(major_id);
3945 server_scope = utsname()->nodename;
3946 server_scope_sz = strlen(server_scope);
3947
3948 p = xdr_reserve_space(xdr,
3949 8 /* eir_clientid */ +
3950 4 /* eir_sequenceid */ +
3951 4 /* eir_flags */ +
3952 4 /* spr_how */);
3953 if (!p)
3954 return nfserr_resource;
3955
3956 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3957 *p++ = cpu_to_be32(exid->seqid);
3958 *p++ = cpu_to_be32(exid->flags);
3959
3960 *p++ = cpu_to_be32(exid->spa_how);
3961
3962 switch (exid->spa_how) {
3963 case SP4_NONE:
3964 break;
3965 case SP4_MACH_CRED:
3966 /* spo_must_enforce bitmap: */
3967 nfserr = nfsd4_encode_bitmap(xdr,
3968 exid->spo_must_enforce[0],
3969 exid->spo_must_enforce[1],
3970 exid->spo_must_enforce[2]);
3971 if (nfserr)
3972 return nfserr;
3973 /* spo_must_allow bitmap: */
3974 nfserr = nfsd4_encode_bitmap(xdr,
3975 exid->spo_must_allow[0],
3976 exid->spo_must_allow[1],
3977 exid->spo_must_allow[2]);
3978 if (nfserr)
3979 return nfserr;
3980 break;
3981 default:
3982 WARN_ON_ONCE(1);
3983 }
3984
3985 p = xdr_reserve_space(xdr,
3986 8 /* so_minor_id */ +
3987 4 /* so_major_id.len */ +
3988 (XDR_QUADLEN(major_id_sz) * 4) +
3989 4 /* eir_server_scope.len */ +
3990 (XDR_QUADLEN(server_scope_sz) * 4) +
3991 4 /* eir_server_impl_id.count (0) */);
3992 if (!p)
3993 return nfserr_resource;
3994
3995 /* The server_owner struct */
3996 p = xdr_encode_hyper(p, minor_id); /* Minor id */
3997 /* major id */
3998 p = xdr_encode_opaque(p, major_id, major_id_sz);
3999
4000 /* Server scope */
4001 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4002
4003 /* Implementation id */
4004 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
4005 return 0;
4006 }
4007
4008 static __be32
4009 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4010 struct nfsd4_create_session *sess)
4011 {
4012 struct xdr_stream *xdr = &resp->xdr;
4013 __be32 *p;
4014
4015 p = xdr_reserve_space(xdr, 24);
4016 if (!p)
4017 return nfserr_resource;
4018 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4019 NFS4_MAX_SESSIONID_LEN);
4020 *p++ = cpu_to_be32(sess->seqid);
4021 *p++ = cpu_to_be32(sess->flags);
4022
4023 p = xdr_reserve_space(xdr, 28);
4024 if (!p)
4025 return nfserr_resource;
4026 *p++ = cpu_to_be32(0); /* headerpadsz */
4027 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4028 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4029 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4030 *p++ = cpu_to_be32(sess->fore_channel.maxops);
4031 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4032 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4033
4034 if (sess->fore_channel.nr_rdma_attrs) {
4035 p = xdr_reserve_space(xdr, 4);
4036 if (!p)
4037 return nfserr_resource;
4038 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4039 }
4040
4041 p = xdr_reserve_space(xdr, 28);
4042 if (!p)
4043 return nfserr_resource;
4044 *p++ = cpu_to_be32(0); /* headerpadsz */
4045 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4046 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4047 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4048 *p++ = cpu_to_be32(sess->back_channel.maxops);
4049 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4050 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4051
4052 if (sess->back_channel.nr_rdma_attrs) {
4053 p = xdr_reserve_space(xdr, 4);
4054 if (!p)
4055 return nfserr_resource;
4056 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4057 }
4058 return 0;
4059 }
4060
4061 static __be32
4062 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4063 struct nfsd4_sequence *seq)
4064 {
4065 struct xdr_stream *xdr = &resp->xdr;
4066 __be32 *p;
4067
4068 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4069 if (!p)
4070 return nfserr_resource;
4071 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4072 NFS4_MAX_SESSIONID_LEN);
4073 *p++ = cpu_to_be32(seq->seqid);
4074 *p++ = cpu_to_be32(seq->slotid);
4075 /* Note slotid's are numbered from zero: */
4076 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4077 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4078 *p++ = cpu_to_be32(seq->status_flags);
4079
4080 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4081 return 0;
4082 }
4083
4084 static __be32
4085 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4086 struct nfsd4_test_stateid *test_stateid)
4087 {
4088 struct xdr_stream *xdr = &resp->xdr;
4089 struct nfsd4_test_stateid_id *stateid, *next;
4090 __be32 *p;
4091
4092 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4093 if (!p)
4094 return nfserr_resource;
4095 *p++ = htonl(test_stateid->ts_num_ids);
4096
4097 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4098 *p++ = stateid->ts_id_status;
4099 }
4100
4101 return 0;
4102 }
4103
4104 #ifdef CONFIG_NFSD_PNFS
4105 static __be32
4106 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4107 struct nfsd4_getdeviceinfo *gdev)
4108 {
4109 struct xdr_stream *xdr = &resp->xdr;
4110 const struct nfsd4_layout_ops *ops;
4111 u32 starting_len = xdr->buf->len, needed_len;
4112 __be32 *p;
4113
4114 p = xdr_reserve_space(xdr, 4);
4115 if (!p)
4116 return nfserr_resource;
4117
4118 *p++ = cpu_to_be32(gdev->gd_layout_type);
4119
4120 /* If maxcount is 0 then just update notifications */
4121 if (gdev->gd_maxcount != 0) {
4122 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4123 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4124 if (nfserr) {
4125 /*
4126 * We don't bother to burden the layout drivers with
4127 * enforcing gd_maxcount, just tell the client to
4128 * come back with a bigger buffer if it's not enough.
4129 */
4130 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4131 goto toosmall;
4132 return nfserr;
4133 }
4134 }
4135
4136 if (gdev->gd_notify_types) {
4137 p = xdr_reserve_space(xdr, 4 + 4);
4138 if (!p)
4139 return nfserr_resource;
4140 *p++ = cpu_to_be32(1); /* bitmap length */
4141 *p++ = cpu_to_be32(gdev->gd_notify_types);
4142 } else {
4143 p = xdr_reserve_space(xdr, 4);
4144 if (!p)
4145 return nfserr_resource;
4146 *p++ = 0;
4147 }
4148
4149 return 0;
4150 toosmall:
4151 dprintk("%s: maxcount too small\n", __func__);
4152 needed_len = xdr->buf->len + 4 /* notifications */;
4153 xdr_truncate_encode(xdr, starting_len);
4154 p = xdr_reserve_space(xdr, 4);
4155 if (!p)
4156 return nfserr_resource;
4157 *p++ = cpu_to_be32(needed_len);
4158 return nfserr_toosmall;
4159 }
4160
4161 static __be32
4162 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4163 struct nfsd4_layoutget *lgp)
4164 {
4165 struct xdr_stream *xdr = &resp->xdr;
4166 const struct nfsd4_layout_ops *ops;
4167 __be32 *p;
4168
4169 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4170 if (!p)
4171 return nfserr_resource;
4172
4173 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4174 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4175 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4176 sizeof(stateid_opaque_t));
4177
4178 *p++ = cpu_to_be32(1); /* we always return a single layout */
4179 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4180 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4181 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4182 *p++ = cpu_to_be32(lgp->lg_layout_type);
4183
4184 ops = nfsd4_layout_ops[lgp->lg_layout_type];
4185 return ops->encode_layoutget(xdr, lgp);
4186 }
4187
4188 static __be32
4189 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4190 struct nfsd4_layoutcommit *lcp)
4191 {
4192 struct xdr_stream *xdr = &resp->xdr;
4193 __be32 *p;
4194
4195 p = xdr_reserve_space(xdr, 4);
4196 if (!p)
4197 return nfserr_resource;
4198 *p++ = cpu_to_be32(lcp->lc_size_chg);
4199 if (lcp->lc_size_chg) {
4200 p = xdr_reserve_space(xdr, 8);
4201 if (!p)
4202 return nfserr_resource;
4203 p = xdr_encode_hyper(p, lcp->lc_newsize);
4204 }
4205
4206 return 0;
4207 }
4208
4209 static __be32
4210 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4211 struct nfsd4_layoutreturn *lrp)
4212 {
4213 struct xdr_stream *xdr = &resp->xdr;
4214 __be32 *p;
4215
4216 p = xdr_reserve_space(xdr, 4);
4217 if (!p)
4218 return nfserr_resource;
4219 *p++ = cpu_to_be32(lrp->lrs_present);
4220 if (lrp->lrs_present)
4221 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4222 return 0;
4223 }
4224 #endif /* CONFIG_NFSD_PNFS */
4225
4226 static __be32
4227 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4228 {
4229 __be32 *p;
4230
4231 p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4232 if (!p)
4233 return nfserr_resource;
4234
4235 *p++ = cpu_to_be32(0);
4236 p = xdr_encode_hyper(p, write->wr_bytes_written);
4237 *p++ = cpu_to_be32(write->wr_stable_how);
4238 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4239 NFS4_VERIFIER_SIZE);
4240 return nfs_ok;
4241 }
4242
4243 static __be32
4244 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4245 struct nfsd4_copy *copy)
4246 {
4247 __be32 *p;
4248
4249 nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
4250 if (nfserr)
4251 return nfserr;
4252
4253 p = xdr_reserve_space(&resp->xdr, 4 + 4);
4254 *p++ = xdr_one; /* cr_consecutive */
4255 *p++ = cpu_to_be32(copy->cp_synchronous);
4256 return 0;
4257 }
4258
4259 static __be32
4260 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4261 struct nfsd4_seek *seek)
4262 {
4263 __be32 *p;
4264
4265 p = xdr_reserve_space(&resp->xdr, 4 + 8);
4266 *p++ = cpu_to_be32(seek->seek_eof);
4267 p = xdr_encode_hyper(p, seek->seek_pos);
4268
4269 return 0;
4270 }
4271
4272 static __be32
4273 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4274 {
4275 return nfserr;
4276 }
4277
4278 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4279
4280 /*
4281 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4282 * since we don't need to filter out obsolete ops as this is
4283 * done in the decoding phase.
4284 */
4285 static const nfsd4_enc nfsd4_enc_ops[] = {
4286 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
4287 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
4288 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
4289 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
4290 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
4291 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4292 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
4293 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
4294 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
4295 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
4296 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
4297 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
4298 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
4299 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
4300 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4301 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
4302 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
4303 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
4304 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
4305 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
4306 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
4307 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
4308 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
4309 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
4310 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
4311 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
4312 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
4313 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
4314 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
4315 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
4316 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
4317 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
4318 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
4319 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4320 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4321 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
4322 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
4323
4324 /* NFSv4.1 operations */
4325 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
4326 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4327 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
4328 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
4329 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
4330 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
4331 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4332 #ifdef CONFIG_NFSD_PNFS
4333 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4334 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4335 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit,
4336 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget,
4337 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn,
4338 #else
4339 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
4340 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4341 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
4342 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
4343 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4344 #endif
4345 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4346 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
4347 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
4348 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
4349 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4350 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
4351 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
4352
4353 /* NFSv4.2 operations */
4354 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4355 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy,
4356 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
4357 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4358 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
4359 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
4360 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
4361 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
4362 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop,
4363 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
4364 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
4365 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
4366 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop,
4367 };
4368
4369 /*
4370 * Calculate whether we still have space to encode repsize bytes.
4371 * There are two considerations:
4372 * - For NFS versions >=4.1, the size of the reply must stay within
4373 * session limits
4374 * - For all NFS versions, we must stay within limited preallocated
4375 * buffer space.
4376 *
4377 * This is called before the operation is processed, so can only provide
4378 * an upper estimate. For some nonidempotent operations (such as
4379 * getattr), it's not necessarily a problem if that estimate is wrong,
4380 * as we can fail it after processing without significant side effects.
4381 */
4382 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4383 {
4384 struct xdr_buf *buf = &resp->rqstp->rq_res;
4385 struct nfsd4_slot *slot = resp->cstate.slot;
4386
4387 if (buf->len + respsize <= buf->buflen)
4388 return nfs_ok;
4389 if (!nfsd4_has_session(&resp->cstate))
4390 return nfserr_resource;
4391 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4392 WARN_ON_ONCE(1);
4393 return nfserr_rep_too_big_to_cache;
4394 }
4395 return nfserr_rep_too_big;
4396 }
4397
4398 void
4399 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4400 {
4401 struct xdr_stream *xdr = &resp->xdr;
4402 struct nfs4_stateowner *so = resp->cstate.replay_owner;
4403 struct svc_rqst *rqstp = resp->rqstp;
4404 const struct nfsd4_operation *opdesc = op->opdesc;
4405 int post_err_offset;
4406 nfsd4_enc encoder;
4407 __be32 *p;
4408
4409 p = xdr_reserve_space(xdr, 8);
4410 if (!p) {
4411 WARN_ON_ONCE(1);
4412 return;
4413 }
4414 *p++ = cpu_to_be32(op->opnum);
4415 post_err_offset = xdr->buf->len;
4416
4417 if (op->opnum == OP_ILLEGAL)
4418 goto status;
4419 if (op->status && opdesc &&
4420 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
4421 goto status;
4422 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4423 !nfsd4_enc_ops[op->opnum]);
4424 encoder = nfsd4_enc_ops[op->opnum];
4425 op->status = encoder(resp, op->status, &op->u);
4426 if (opdesc && opdesc->op_release)
4427 opdesc->op_release(&op->u);
4428 xdr_commit_encode(xdr);
4429
4430 /* nfsd4_check_resp_size guarantees enough room for error status */
4431 if (!op->status) {
4432 int space_needed = 0;
4433 if (!nfsd4_last_compound_op(rqstp))
4434 space_needed = COMPOUND_ERR_SLACK_SPACE;
4435 op->status = nfsd4_check_resp_size(resp, space_needed);
4436 }
4437 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4438 struct nfsd4_slot *slot = resp->cstate.slot;
4439
4440 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4441 op->status = nfserr_rep_too_big_to_cache;
4442 else
4443 op->status = nfserr_rep_too_big;
4444 }
4445 if (op->status == nfserr_resource ||
4446 op->status == nfserr_rep_too_big ||
4447 op->status == nfserr_rep_too_big_to_cache) {
4448 /*
4449 * The operation may have already been encoded or
4450 * partially encoded. No op returns anything additional
4451 * in the case of one of these three errors, so we can
4452 * just truncate back to after the status. But it's a
4453 * bug if we had to do this on a non-idempotent op:
4454 */
4455 warn_on_nonidempotent_op(op);
4456 xdr_truncate_encode(xdr, post_err_offset);
4457 }
4458 if (so) {
4459 int len = xdr->buf->len - post_err_offset;
4460
4461 so->so_replay.rp_status = op->status;
4462 so->so_replay.rp_buflen = len;
4463 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4464 so->so_replay.rp_buf, len);
4465 }
4466 status:
4467 /* Note that op->status is already in network byte order: */
4468 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4469 }
4470
4471 /*
4472 * Encode the reply stored in the stateowner reply cache
4473 *
4474 * XDR note: do not encode rp->rp_buflen: the buffer contains the
4475 * previously sent already encoded operation.
4476 */
4477 void
4478 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4479 {
4480 __be32 *p;
4481 struct nfs4_replay *rp = op->replay;
4482
4483 BUG_ON(!rp);
4484
4485 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4486 if (!p) {
4487 WARN_ON_ONCE(1);
4488 return;
4489 }
4490 *p++ = cpu_to_be32(op->opnum);
4491 *p++ = rp->rp_status; /* already xdr'ed */
4492
4493 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4494 }
4495
4496 int
4497 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4498 {
4499 return xdr_ressize_check(rqstp, p);
4500 }
4501
4502 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4503 {
4504 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4505
4506 if (args->ops != args->iops) {
4507 kfree(args->ops);
4508 args->ops = args->iops;
4509 }
4510 kfree(args->tmpp);
4511 args->tmpp = NULL;
4512 while (args->to_free) {
4513 struct svcxdr_tmpbuf *tb = args->to_free;
4514 args->to_free = tb->next;
4515 kfree(tb);
4516 }
4517 }
4518
4519 int
4520 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4521 {
4522 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4523
4524 if (rqstp->rq_arg.head[0].iov_len % 4) {
4525 /* client is nuts */
4526 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4527 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4528 return 0;
4529 }
4530 args->p = p;
4531 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4532 args->pagelist = rqstp->rq_arg.pages;
4533 args->pagelen = rqstp->rq_arg.page_len;
4534 args->tail = false;
4535 args->tmpp = NULL;
4536 args->to_free = NULL;
4537 args->ops = args->iops;
4538 args->rqstp = rqstp;
4539
4540 return !nfsd4_decode_compound(args);
4541 }
4542
4543 int
4544 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4545 {
4546 /*
4547 * All that remains is to write the tag and operation count...
4548 */
4549 struct nfsd4_compoundres *resp = rqstp->rq_resp;
4550 struct xdr_buf *buf = resp->xdr.buf;
4551
4552 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4553 buf->tail[0].iov_len);
4554
4555 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4556
4557 p = resp->tagp;
4558 *p++ = htonl(resp->taglen);
4559 memcpy(p, resp->tag, resp->taglen);
4560 p += XDR_QUADLEN(resp->taglen);
4561 *p++ = htonl(resp->opcnt);
4562
4563 nfsd4_sequence_done(resp);
4564 return 1;
4565 }
4566
4567 /*
4568 * Local variables:
4569 * c-basic-offset: 8
4570 * End:
4571 */
Linux with added FPC-III support