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[mirror_ubuntu-hirsute-kernel.git] / fs / nfsd / nfs4xdr.c
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 #include "filecache.h"
53
54 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
55 #include <linux/security.h>
56 #endif
57
58
59 #define NFSDDBG_FACILITY NFSDDBG_XDR
60
61 const u32 nfsd_suppattrs[3][3] = {
62 {NFSD4_SUPPORTED_ATTRS_WORD0,
63 NFSD4_SUPPORTED_ATTRS_WORD1,
64 NFSD4_SUPPORTED_ATTRS_WORD2},
65
66 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
67 NFSD4_1_SUPPORTED_ATTRS_WORD1,
68 NFSD4_1_SUPPORTED_ATTRS_WORD2},
69
70 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
71 NFSD4_1_SUPPORTED_ATTRS_WORD1,
72 NFSD4_2_SUPPORTED_ATTRS_WORD2},
73 };
74
75 /*
76 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
77 * directory in order to indicate to the client that a filesystem boundary is present
78 * We use a fixed fsid for a referral
79 */
80 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
81 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
82
83 static __be32
84 check_filename(char *str, int len)
85 {
86 int i;
87
88 if (len == 0)
89 return nfserr_inval;
90 if (isdotent(str, len))
91 return nfserr_badname;
92 for (i = 0; i < len; i++)
93 if (str[i] == '/')
94 return nfserr_badname;
95 return 0;
96 }
97
98 #define DECODE_HEAD \
99 __be32 *p; \
100 __be32 status
101 #define DECODE_TAIL \
102 status = 0; \
103 out: \
104 return status; \
105 xdr_error: \
106 dprintk("NFSD: xdr error (%s:%d)\n", \
107 __FILE__, __LINE__); \
108 status = nfserr_bad_xdr; \
109 goto out
110
111 #define READMEM(x,nbytes) do { \
112 x = (char *)p; \
113 p += XDR_QUADLEN(nbytes); \
114 } while (0)
115 #define SAVEMEM(x,nbytes) do { \
116 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
117 savemem(argp, p, nbytes) : \
118 (char *)p)) { \
119 dprintk("NFSD: xdr error (%s:%d)\n", \
120 __FILE__, __LINE__); \
121 goto xdr_error; \
122 } \
123 p += XDR_QUADLEN(nbytes); \
124 } while (0)
125 #define COPYMEM(x,nbytes) do { \
126 memcpy((x), p, nbytes); \
127 p += XDR_QUADLEN(nbytes); \
128 } while (0)
129
130 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
131 #define READ_BUF(nbytes) do { \
132 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
133 p = argp->p; \
134 argp->p += XDR_QUADLEN(nbytes); \
135 } else if (!(p = read_buf(argp, nbytes))) { \
136 dprintk("NFSD: xdr error (%s:%d)\n", \
137 __FILE__, __LINE__); \
138 goto xdr_error; \
139 } \
140 } while (0)
141
142 static void next_decode_page(struct nfsd4_compoundargs *argp)
143 {
144 argp->p = page_address(argp->pagelist[0]);
145 argp->pagelist++;
146 if (argp->pagelen < PAGE_SIZE) {
147 argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
148 argp->pagelen = 0;
149 } else {
150 argp->end = argp->p + (PAGE_SIZE>>2);
151 argp->pagelen -= PAGE_SIZE;
152 }
153 }
154
155 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
156 {
157 /* We want more bytes than seem to be available.
158 * Maybe we need a new page, maybe we have just run out
159 */
160 unsigned int avail = (char *)argp->end - (char *)argp->p;
161 __be32 *p;
162
163 if (argp->pagelen == 0) {
164 struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
165
166 if (!argp->tail) {
167 argp->tail = true;
168 avail = vec->iov_len;
169 argp->p = vec->iov_base;
170 argp->end = vec->iov_base + avail;
171 }
172
173 if (avail < nbytes)
174 return NULL;
175
176 p = argp->p;
177 argp->p += XDR_QUADLEN(nbytes);
178 return p;
179 }
180
181 if (avail + argp->pagelen < nbytes)
182 return NULL;
183 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
184 return NULL;
185 /* ok, we can do it with the current plus the next page */
186 if (nbytes <= sizeof(argp->tmp))
187 p = argp->tmp;
188 else {
189 kfree(argp->tmpp);
190 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
191 if (!p)
192 return NULL;
193
194 }
195 /*
196 * The following memcpy is safe because read_buf is always
197 * called with nbytes > avail, and the two cases above both
198 * guarantee p points to at least nbytes bytes.
199 */
200 memcpy(p, argp->p, avail);
201 next_decode_page(argp);
202 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
203 argp->p += XDR_QUADLEN(nbytes - avail);
204 return p;
205 }
206
207 static unsigned int compoundargs_bytes_left(struct nfsd4_compoundargs *argp)
208 {
209 unsigned int this = (char *)argp->end - (char *)argp->p;
210
211 return this + argp->pagelen;
212 }
213
214 static int zero_clientid(clientid_t *clid)
215 {
216 return (clid->cl_boot == 0) && (clid->cl_id == 0);
217 }
218
219 /**
220 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
221 * @argp: NFSv4 compound argument structure
222 * @len: length of buffer to allocate
223 *
224 * Allocates a buffer of size @len to be freed when processing the compound
225 * operation described in @argp finishes.
226 */
227 static void *
228 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
229 {
230 struct svcxdr_tmpbuf *tb;
231
232 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
233 if (!tb)
234 return NULL;
235 tb->next = argp->to_free;
236 argp->to_free = tb;
237 return tb->buf;
238 }
239
240 /*
241 * For xdr strings that need to be passed to other kernel api's
242 * as null-terminated strings.
243 *
244 * Note null-terminating in place usually isn't safe since the
245 * buffer might end on a page boundary.
246 */
247 static char *
248 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
249 {
250 char *p = svcxdr_tmpalloc(argp, len + 1);
251
252 if (!p)
253 return NULL;
254 memcpy(p, buf, len);
255 p[len] = '\0';
256 return p;
257 }
258
259 /**
260 * savemem - duplicate a chunk of memory for later processing
261 * @argp: NFSv4 compound argument structure to be freed with
262 * @p: pointer to be duplicated
263 * @nbytes: length to be duplicated
264 *
265 * Returns a pointer to a copy of @nbytes bytes of memory at @p
266 * that are preserved until processing of the NFSv4 compound
267 * operation described by @argp finishes.
268 */
269 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
270 {
271 void *ret;
272
273 ret = svcxdr_tmpalloc(argp, nbytes);
274 if (!ret)
275 return NULL;
276 memcpy(ret, p, nbytes);
277 return ret;
278 }
279
280 static __be32
281 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
282 {
283 DECODE_HEAD;
284
285 READ_BUF(12);
286 p = xdr_decode_hyper(p, &tv->tv_sec);
287 tv->tv_nsec = be32_to_cpup(p++);
288 if (tv->tv_nsec >= (u32)1000000000)
289 return nfserr_inval;
290
291 DECODE_TAIL;
292 }
293
294 static __be32
295 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
296 {
297 u32 bmlen;
298 DECODE_HEAD;
299
300 bmval[0] = 0;
301 bmval[1] = 0;
302 bmval[2] = 0;
303
304 READ_BUF(4);
305 bmlen = be32_to_cpup(p++);
306 if (bmlen > 1000)
307 goto xdr_error;
308
309 READ_BUF(bmlen << 2);
310 if (bmlen > 0)
311 bmval[0] = be32_to_cpup(p++);
312 if (bmlen > 1)
313 bmval[1] = be32_to_cpup(p++);
314 if (bmlen > 2)
315 bmval[2] = be32_to_cpup(p++);
316
317 DECODE_TAIL;
318 }
319
320 static __be32
321 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
322 struct iattr *iattr, struct nfs4_acl **acl,
323 struct xdr_netobj *label, int *umask)
324 {
325 int expected_len, len = 0;
326 u32 dummy32;
327 char *buf;
328
329 DECODE_HEAD;
330 iattr->ia_valid = 0;
331 if ((status = nfsd4_decode_bitmap(argp, bmval)))
332 return status;
333
334 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
335 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
336 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
337 if (nfsd_attrs_supported(argp->minorversion, bmval))
338 return nfserr_inval;
339 return nfserr_attrnotsupp;
340 }
341
342 READ_BUF(4);
343 expected_len = be32_to_cpup(p++);
344
345 if (bmval[0] & FATTR4_WORD0_SIZE) {
346 READ_BUF(8);
347 len += 8;
348 p = xdr_decode_hyper(p, &iattr->ia_size);
349 iattr->ia_valid |= ATTR_SIZE;
350 }
351 if (bmval[0] & FATTR4_WORD0_ACL) {
352 u32 nace;
353 struct nfs4_ace *ace;
354
355 READ_BUF(4); len += 4;
356 nace = be32_to_cpup(p++);
357
358 if (nace > compoundargs_bytes_left(argp)/20)
359 /*
360 * Even with 4-byte names there wouldn't be
361 * space for that many aces; something fishy is
362 * going on:
363 */
364 return nfserr_fbig;
365
366 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
367 if (*acl == NULL)
368 return nfserr_jukebox;
369
370 (*acl)->naces = nace;
371 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
372 READ_BUF(16); len += 16;
373 ace->type = be32_to_cpup(p++);
374 ace->flag = be32_to_cpup(p++);
375 ace->access_mask = be32_to_cpup(p++);
376 dummy32 = be32_to_cpup(p++);
377 READ_BUF(dummy32);
378 len += XDR_QUADLEN(dummy32) << 2;
379 READMEM(buf, dummy32);
380 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
381 status = nfs_ok;
382 if (ace->whotype != NFS4_ACL_WHO_NAMED)
383 ;
384 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
385 status = nfsd_map_name_to_gid(argp->rqstp,
386 buf, dummy32, &ace->who_gid);
387 else
388 status = nfsd_map_name_to_uid(argp->rqstp,
389 buf, dummy32, &ace->who_uid);
390 if (status)
391 return status;
392 }
393 } else
394 *acl = NULL;
395 if (bmval[1] & FATTR4_WORD1_MODE) {
396 READ_BUF(4);
397 len += 4;
398 iattr->ia_mode = be32_to_cpup(p++);
399 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
400 iattr->ia_valid |= ATTR_MODE;
401 }
402 if (bmval[1] & FATTR4_WORD1_OWNER) {
403 READ_BUF(4);
404 len += 4;
405 dummy32 = be32_to_cpup(p++);
406 READ_BUF(dummy32);
407 len += (XDR_QUADLEN(dummy32) << 2);
408 READMEM(buf, dummy32);
409 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
410 return status;
411 iattr->ia_valid |= ATTR_UID;
412 }
413 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
414 READ_BUF(4);
415 len += 4;
416 dummy32 = be32_to_cpup(p++);
417 READ_BUF(dummy32);
418 len += (XDR_QUADLEN(dummy32) << 2);
419 READMEM(buf, dummy32);
420 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
421 return status;
422 iattr->ia_valid |= ATTR_GID;
423 }
424 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
425 READ_BUF(4);
426 len += 4;
427 dummy32 = be32_to_cpup(p++);
428 switch (dummy32) {
429 case NFS4_SET_TO_CLIENT_TIME:
430 len += 12;
431 status = nfsd4_decode_time(argp, &iattr->ia_atime);
432 if (status)
433 return status;
434 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
435 break;
436 case NFS4_SET_TO_SERVER_TIME:
437 iattr->ia_valid |= ATTR_ATIME;
438 break;
439 default:
440 goto xdr_error;
441 }
442 }
443 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
444 READ_BUF(4);
445 len += 4;
446 dummy32 = be32_to_cpup(p++);
447 switch (dummy32) {
448 case NFS4_SET_TO_CLIENT_TIME:
449 len += 12;
450 status = nfsd4_decode_time(argp, &iattr->ia_mtime);
451 if (status)
452 return status;
453 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
454 break;
455 case NFS4_SET_TO_SERVER_TIME:
456 iattr->ia_valid |= ATTR_MTIME;
457 break;
458 default:
459 goto xdr_error;
460 }
461 }
462
463 label->len = 0;
464 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
465 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
466 READ_BUF(4);
467 len += 4;
468 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
469 READ_BUF(4);
470 len += 4;
471 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
472 READ_BUF(4);
473 len += 4;
474 dummy32 = be32_to_cpup(p++);
475 READ_BUF(dummy32);
476 if (dummy32 > NFS4_MAXLABELLEN)
477 return nfserr_badlabel;
478 len += (XDR_QUADLEN(dummy32) << 2);
479 READMEM(buf, dummy32);
480 label->len = dummy32;
481 label->data = svcxdr_dupstr(argp, buf, dummy32);
482 if (!label->data)
483 return nfserr_jukebox;
484 }
485 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
486 if (!umask)
487 goto xdr_error;
488 READ_BUF(8);
489 len += 8;
490 dummy32 = be32_to_cpup(p++);
491 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
492 dummy32 = be32_to_cpup(p++);
493 *umask = dummy32 & S_IRWXUGO;
494 iattr->ia_valid |= ATTR_MODE;
495 }
496 if (len != expected_len)
497 goto xdr_error;
498
499 DECODE_TAIL;
500 }
501
502 static __be32
503 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
504 {
505 DECODE_HEAD;
506
507 READ_BUF(sizeof(stateid_t));
508 sid->si_generation = be32_to_cpup(p++);
509 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
510
511 DECODE_TAIL;
512 }
513
514 static __be32
515 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
516 {
517 DECODE_HEAD;
518
519 READ_BUF(4);
520 access->ac_req_access = be32_to_cpup(p++);
521
522 DECODE_TAIL;
523 }
524
525 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
526 {
527 DECODE_HEAD;
528 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
529 u32 dummy, uid, gid;
530 char *machine_name;
531 int i;
532 int nr_secflavs;
533
534 /* callback_sec_params4 */
535 READ_BUF(4);
536 nr_secflavs = be32_to_cpup(p++);
537 if (nr_secflavs)
538 cbs->flavor = (u32)(-1);
539 else
540 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
541 cbs->flavor = 0;
542 for (i = 0; i < nr_secflavs; ++i) {
543 READ_BUF(4);
544 dummy = be32_to_cpup(p++);
545 switch (dummy) {
546 case RPC_AUTH_NULL:
547 /* Nothing to read */
548 if (cbs->flavor == (u32)(-1))
549 cbs->flavor = RPC_AUTH_NULL;
550 break;
551 case RPC_AUTH_UNIX:
552 READ_BUF(8);
553 /* stamp */
554 dummy = be32_to_cpup(p++);
555
556 /* machine name */
557 dummy = be32_to_cpup(p++);
558 READ_BUF(dummy);
559 SAVEMEM(machine_name, dummy);
560
561 /* uid, gid */
562 READ_BUF(8);
563 uid = be32_to_cpup(p++);
564 gid = be32_to_cpup(p++);
565
566 /* more gids */
567 READ_BUF(4);
568 dummy = be32_to_cpup(p++);
569 READ_BUF(dummy * 4);
570 if (cbs->flavor == (u32)(-1)) {
571 kuid_t kuid = make_kuid(userns, uid);
572 kgid_t kgid = make_kgid(userns, gid);
573 if (uid_valid(kuid) && gid_valid(kgid)) {
574 cbs->uid = kuid;
575 cbs->gid = kgid;
576 cbs->flavor = RPC_AUTH_UNIX;
577 } else {
578 dprintk("RPC_AUTH_UNIX with invalid"
579 "uid or gid ignoring!\n");
580 }
581 }
582 break;
583 case RPC_AUTH_GSS:
584 dprintk("RPC_AUTH_GSS callback secflavor "
585 "not supported!\n");
586 READ_BUF(8);
587 /* gcbp_service */
588 dummy = be32_to_cpup(p++);
589 /* gcbp_handle_from_server */
590 dummy = be32_to_cpup(p++);
591 READ_BUF(dummy);
592 p += XDR_QUADLEN(dummy);
593 /* gcbp_handle_from_client */
594 READ_BUF(4);
595 dummy = be32_to_cpup(p++);
596 READ_BUF(dummy);
597 break;
598 default:
599 dprintk("Illegal callback secflavor\n");
600 return nfserr_inval;
601 }
602 }
603 DECODE_TAIL;
604 }
605
606 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
607 {
608 DECODE_HEAD;
609
610 READ_BUF(4);
611 bc->bc_cb_program = be32_to_cpup(p++);
612 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
613
614 DECODE_TAIL;
615 }
616
617 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
618 {
619 DECODE_HEAD;
620
621 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
622 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
623 bcts->dir = be32_to_cpup(p++);
624 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
625 * could help us figure out we should be using it. */
626 DECODE_TAIL;
627 }
628
629 static __be32
630 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
631 {
632 DECODE_HEAD;
633
634 READ_BUF(4);
635 close->cl_seqid = be32_to_cpup(p++);
636 return nfsd4_decode_stateid(argp, &close->cl_stateid);
637
638 DECODE_TAIL;
639 }
640
641
642 static __be32
643 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
644 {
645 DECODE_HEAD;
646
647 READ_BUF(12);
648 p = xdr_decode_hyper(p, &commit->co_offset);
649 commit->co_count = be32_to_cpup(p++);
650
651 DECODE_TAIL;
652 }
653
654 static __be32
655 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
656 {
657 DECODE_HEAD;
658
659 READ_BUF(4);
660 create->cr_type = be32_to_cpup(p++);
661 switch (create->cr_type) {
662 case NF4LNK:
663 READ_BUF(4);
664 create->cr_datalen = be32_to_cpup(p++);
665 READ_BUF(create->cr_datalen);
666 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
667 if (!create->cr_data)
668 return nfserr_jukebox;
669 break;
670 case NF4BLK:
671 case NF4CHR:
672 READ_BUF(8);
673 create->cr_specdata1 = be32_to_cpup(p++);
674 create->cr_specdata2 = be32_to_cpup(p++);
675 break;
676 case NF4SOCK:
677 case NF4FIFO:
678 case NF4DIR:
679 default:
680 break;
681 }
682
683 READ_BUF(4);
684 create->cr_namelen = be32_to_cpup(p++);
685 READ_BUF(create->cr_namelen);
686 SAVEMEM(create->cr_name, create->cr_namelen);
687 if ((status = check_filename(create->cr_name, create->cr_namelen)))
688 return status;
689
690 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
691 &create->cr_acl, &create->cr_label,
692 &create->cr_umask);
693 if (status)
694 goto out;
695
696 DECODE_TAIL;
697 }
698
699 static inline __be32
700 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
701 {
702 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
703 }
704
705 static inline __be32
706 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
707 {
708 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
709 }
710
711 static __be32
712 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
713 {
714 DECODE_HEAD;
715
716 READ_BUF(4);
717 link->li_namelen = be32_to_cpup(p++);
718 READ_BUF(link->li_namelen);
719 SAVEMEM(link->li_name, link->li_namelen);
720 if ((status = check_filename(link->li_name, link->li_namelen)))
721 return status;
722
723 DECODE_TAIL;
724 }
725
726 static __be32
727 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
728 {
729 DECODE_HEAD;
730
731 /*
732 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
733 */
734 READ_BUF(28);
735 lock->lk_type = be32_to_cpup(p++);
736 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
737 goto xdr_error;
738 lock->lk_reclaim = be32_to_cpup(p++);
739 p = xdr_decode_hyper(p, &lock->lk_offset);
740 p = xdr_decode_hyper(p, &lock->lk_length);
741 lock->lk_is_new = be32_to_cpup(p++);
742
743 if (lock->lk_is_new) {
744 READ_BUF(4);
745 lock->lk_new_open_seqid = be32_to_cpup(p++);
746 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
747 if (status)
748 return status;
749 READ_BUF(8 + sizeof(clientid_t));
750 lock->lk_new_lock_seqid = be32_to_cpup(p++);
751 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
752 lock->lk_new_owner.len = be32_to_cpup(p++);
753 READ_BUF(lock->lk_new_owner.len);
754 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
755 } else {
756 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
757 if (status)
758 return status;
759 READ_BUF(4);
760 lock->lk_old_lock_seqid = be32_to_cpup(p++);
761 }
762
763 DECODE_TAIL;
764 }
765
766 static __be32
767 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
768 {
769 DECODE_HEAD;
770
771 READ_BUF(32);
772 lockt->lt_type = be32_to_cpup(p++);
773 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
774 goto xdr_error;
775 p = xdr_decode_hyper(p, &lockt->lt_offset);
776 p = xdr_decode_hyper(p, &lockt->lt_length);
777 COPYMEM(&lockt->lt_clientid, 8);
778 lockt->lt_owner.len = be32_to_cpup(p++);
779 READ_BUF(lockt->lt_owner.len);
780 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
781
782 DECODE_TAIL;
783 }
784
785 static __be32
786 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
787 {
788 DECODE_HEAD;
789
790 READ_BUF(8);
791 locku->lu_type = be32_to_cpup(p++);
792 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
793 goto xdr_error;
794 locku->lu_seqid = be32_to_cpup(p++);
795 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
796 if (status)
797 return status;
798 READ_BUF(16);
799 p = xdr_decode_hyper(p, &locku->lu_offset);
800 p = xdr_decode_hyper(p, &locku->lu_length);
801
802 DECODE_TAIL;
803 }
804
805 static __be32
806 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
807 {
808 DECODE_HEAD;
809
810 READ_BUF(4);
811 lookup->lo_len = be32_to_cpup(p++);
812 READ_BUF(lookup->lo_len);
813 SAVEMEM(lookup->lo_name, lookup->lo_len);
814 if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
815 return status;
816
817 DECODE_TAIL;
818 }
819
820 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
821 {
822 __be32 *p;
823 u32 w;
824
825 READ_BUF(4);
826 w = be32_to_cpup(p++);
827 *share_access = w & NFS4_SHARE_ACCESS_MASK;
828 *deleg_want = w & NFS4_SHARE_WANT_MASK;
829 if (deleg_when)
830 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
831
832 switch (w & NFS4_SHARE_ACCESS_MASK) {
833 case NFS4_SHARE_ACCESS_READ:
834 case NFS4_SHARE_ACCESS_WRITE:
835 case NFS4_SHARE_ACCESS_BOTH:
836 break;
837 default:
838 return nfserr_bad_xdr;
839 }
840 w &= ~NFS4_SHARE_ACCESS_MASK;
841 if (!w)
842 return nfs_ok;
843 if (!argp->minorversion)
844 return nfserr_bad_xdr;
845 switch (w & NFS4_SHARE_WANT_MASK) {
846 case NFS4_SHARE_WANT_NO_PREFERENCE:
847 case NFS4_SHARE_WANT_READ_DELEG:
848 case NFS4_SHARE_WANT_WRITE_DELEG:
849 case NFS4_SHARE_WANT_ANY_DELEG:
850 case NFS4_SHARE_WANT_NO_DELEG:
851 case NFS4_SHARE_WANT_CANCEL:
852 break;
853 default:
854 return nfserr_bad_xdr;
855 }
856 w &= ~NFS4_SHARE_WANT_MASK;
857 if (!w)
858 return nfs_ok;
859
860 if (!deleg_when) /* open_downgrade */
861 return nfserr_inval;
862 switch (w) {
863 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
864 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
865 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
866 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
867 return nfs_ok;
868 }
869 xdr_error:
870 return nfserr_bad_xdr;
871 }
872
873 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
874 {
875 __be32 *p;
876
877 READ_BUF(4);
878 *x = be32_to_cpup(p++);
879 /* Note: unlinke access bits, deny bits may be zero. */
880 if (*x & ~NFS4_SHARE_DENY_BOTH)
881 return nfserr_bad_xdr;
882 return nfs_ok;
883 xdr_error:
884 return nfserr_bad_xdr;
885 }
886
887 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
888 {
889 __be32 *p;
890
891 READ_BUF(4);
892 o->len = be32_to_cpup(p++);
893
894 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
895 return nfserr_bad_xdr;
896
897 READ_BUF(o->len);
898 SAVEMEM(o->data, o->len);
899 return nfs_ok;
900 xdr_error:
901 return nfserr_bad_xdr;
902 }
903
904 static __be32
905 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
906 {
907 DECODE_HEAD;
908 u32 dummy;
909
910 memset(open->op_bmval, 0, sizeof(open->op_bmval));
911 open->op_iattr.ia_valid = 0;
912 open->op_openowner = NULL;
913
914 open->op_xdr_error = 0;
915 /* seqid, share_access, share_deny, clientid, ownerlen */
916 READ_BUF(4);
917 open->op_seqid = be32_to_cpup(p++);
918 /* decode, yet ignore deleg_when until supported */
919 status = nfsd4_decode_share_access(argp, &open->op_share_access,
920 &open->op_deleg_want, &dummy);
921 if (status)
922 goto xdr_error;
923 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
924 if (status)
925 goto xdr_error;
926 READ_BUF(sizeof(clientid_t));
927 COPYMEM(&open->op_clientid, sizeof(clientid_t));
928 status = nfsd4_decode_opaque(argp, &open->op_owner);
929 if (status)
930 goto xdr_error;
931 READ_BUF(4);
932 open->op_create = be32_to_cpup(p++);
933 switch (open->op_create) {
934 case NFS4_OPEN_NOCREATE:
935 break;
936 case NFS4_OPEN_CREATE:
937 READ_BUF(4);
938 open->op_createmode = be32_to_cpup(p++);
939 switch (open->op_createmode) {
940 case NFS4_CREATE_UNCHECKED:
941 case NFS4_CREATE_GUARDED:
942 status = nfsd4_decode_fattr(argp, open->op_bmval,
943 &open->op_iattr, &open->op_acl, &open->op_label,
944 &open->op_umask);
945 if (status)
946 goto out;
947 break;
948 case NFS4_CREATE_EXCLUSIVE:
949 READ_BUF(NFS4_VERIFIER_SIZE);
950 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
951 break;
952 case NFS4_CREATE_EXCLUSIVE4_1:
953 if (argp->minorversion < 1)
954 goto xdr_error;
955 READ_BUF(NFS4_VERIFIER_SIZE);
956 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
957 status = nfsd4_decode_fattr(argp, open->op_bmval,
958 &open->op_iattr, &open->op_acl, &open->op_label,
959 &open->op_umask);
960 if (status)
961 goto out;
962 break;
963 default:
964 goto xdr_error;
965 }
966 break;
967 default:
968 goto xdr_error;
969 }
970
971 /* open_claim */
972 READ_BUF(4);
973 open->op_claim_type = be32_to_cpup(p++);
974 switch (open->op_claim_type) {
975 case NFS4_OPEN_CLAIM_NULL:
976 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
977 READ_BUF(4);
978 open->op_fname.len = be32_to_cpup(p++);
979 READ_BUF(open->op_fname.len);
980 SAVEMEM(open->op_fname.data, open->op_fname.len);
981 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
982 return status;
983 break;
984 case NFS4_OPEN_CLAIM_PREVIOUS:
985 READ_BUF(4);
986 open->op_delegate_type = be32_to_cpup(p++);
987 break;
988 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
989 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
990 if (status)
991 return status;
992 READ_BUF(4);
993 open->op_fname.len = be32_to_cpup(p++);
994 READ_BUF(open->op_fname.len);
995 SAVEMEM(open->op_fname.data, open->op_fname.len);
996 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
997 return status;
998 break;
999 case NFS4_OPEN_CLAIM_FH:
1000 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1001 if (argp->minorversion < 1)
1002 goto xdr_error;
1003 /* void */
1004 break;
1005 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1006 if (argp->minorversion < 1)
1007 goto xdr_error;
1008 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1009 if (status)
1010 return status;
1011 break;
1012 default:
1013 goto xdr_error;
1014 }
1015
1016 DECODE_TAIL;
1017 }
1018
1019 static __be32
1020 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1021 {
1022 DECODE_HEAD;
1023
1024 if (argp->minorversion >= 1)
1025 return nfserr_notsupp;
1026
1027 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1028 if (status)
1029 return status;
1030 READ_BUF(4);
1031 open_conf->oc_seqid = be32_to_cpup(p++);
1032
1033 DECODE_TAIL;
1034 }
1035
1036 static __be32
1037 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1038 {
1039 DECODE_HEAD;
1040
1041 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1042 if (status)
1043 return status;
1044 READ_BUF(4);
1045 open_down->od_seqid = be32_to_cpup(p++);
1046 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1047 &open_down->od_deleg_want, NULL);
1048 if (status)
1049 return status;
1050 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1051 if (status)
1052 return status;
1053 DECODE_TAIL;
1054 }
1055
1056 static __be32
1057 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1058 {
1059 DECODE_HEAD;
1060
1061 READ_BUF(4);
1062 putfh->pf_fhlen = be32_to_cpup(p++);
1063 if (putfh->pf_fhlen > NFS4_FHSIZE)
1064 goto xdr_error;
1065 READ_BUF(putfh->pf_fhlen);
1066 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1067
1068 DECODE_TAIL;
1069 }
1070
1071 static __be32
1072 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1073 {
1074 if (argp->minorversion == 0)
1075 return nfs_ok;
1076 return nfserr_notsupp;
1077 }
1078
1079 static __be32
1080 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1081 {
1082 DECODE_HEAD;
1083
1084 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1085 if (status)
1086 return status;
1087 READ_BUF(12);
1088 p = xdr_decode_hyper(p, &read->rd_offset);
1089 read->rd_length = be32_to_cpup(p++);
1090
1091 DECODE_TAIL;
1092 }
1093
1094 static __be32
1095 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1096 {
1097 DECODE_HEAD;
1098
1099 READ_BUF(24);
1100 p = xdr_decode_hyper(p, &readdir->rd_cookie);
1101 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1102 readdir->rd_dircount = be32_to_cpup(p++);
1103 readdir->rd_maxcount = be32_to_cpup(p++);
1104 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1105 goto out;
1106
1107 DECODE_TAIL;
1108 }
1109
1110 static __be32
1111 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1112 {
1113 DECODE_HEAD;
1114
1115 READ_BUF(4);
1116 remove->rm_namelen = be32_to_cpup(p++);
1117 READ_BUF(remove->rm_namelen);
1118 SAVEMEM(remove->rm_name, remove->rm_namelen);
1119 if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1120 return status;
1121
1122 DECODE_TAIL;
1123 }
1124
1125 static __be32
1126 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1127 {
1128 DECODE_HEAD;
1129
1130 READ_BUF(4);
1131 rename->rn_snamelen = be32_to_cpup(p++);
1132 READ_BUF(rename->rn_snamelen);
1133 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1134 READ_BUF(4);
1135 rename->rn_tnamelen = be32_to_cpup(p++);
1136 READ_BUF(rename->rn_tnamelen);
1137 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1138 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1139 return status;
1140 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1141 return status;
1142
1143 DECODE_TAIL;
1144 }
1145
1146 static __be32
1147 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1148 {
1149 DECODE_HEAD;
1150
1151 if (argp->minorversion >= 1)
1152 return nfserr_notsupp;
1153
1154 READ_BUF(sizeof(clientid_t));
1155 COPYMEM(clientid, sizeof(clientid_t));
1156
1157 DECODE_TAIL;
1158 }
1159
1160 static __be32
1161 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1162 struct nfsd4_secinfo *secinfo)
1163 {
1164 DECODE_HEAD;
1165
1166 READ_BUF(4);
1167 secinfo->si_namelen = be32_to_cpup(p++);
1168 READ_BUF(secinfo->si_namelen);
1169 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1170 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1171 if (status)
1172 return status;
1173 DECODE_TAIL;
1174 }
1175
1176 static __be32
1177 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1178 struct nfsd4_secinfo_no_name *sin)
1179 {
1180 DECODE_HEAD;
1181
1182 READ_BUF(4);
1183 sin->sin_style = be32_to_cpup(p++);
1184 DECODE_TAIL;
1185 }
1186
1187 static __be32
1188 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1189 {
1190 __be32 status;
1191
1192 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1193 if (status)
1194 return status;
1195 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1196 &setattr->sa_acl, &setattr->sa_label, NULL);
1197 }
1198
1199 static __be32
1200 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1201 {
1202 DECODE_HEAD;
1203
1204 if (argp->minorversion >= 1)
1205 return nfserr_notsupp;
1206
1207 READ_BUF(NFS4_VERIFIER_SIZE);
1208 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1209
1210 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1211 if (status)
1212 return nfserr_bad_xdr;
1213 READ_BUF(8);
1214 setclientid->se_callback_prog = be32_to_cpup(p++);
1215 setclientid->se_callback_netid_len = be32_to_cpup(p++);
1216 READ_BUF(setclientid->se_callback_netid_len);
1217 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1218 READ_BUF(4);
1219 setclientid->se_callback_addr_len = be32_to_cpup(p++);
1220
1221 READ_BUF(setclientid->se_callback_addr_len);
1222 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1223 READ_BUF(4);
1224 setclientid->se_callback_ident = be32_to_cpup(p++);
1225
1226 DECODE_TAIL;
1227 }
1228
1229 static __be32
1230 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1231 {
1232 DECODE_HEAD;
1233
1234 if (argp->minorversion >= 1)
1235 return nfserr_notsupp;
1236
1237 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1238 COPYMEM(&scd_c->sc_clientid, 8);
1239 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1240
1241 DECODE_TAIL;
1242 }
1243
1244 /* Also used for NVERIFY */
1245 static __be32
1246 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1247 {
1248 DECODE_HEAD;
1249
1250 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1251 goto out;
1252
1253 /* For convenience's sake, we compare raw xdr'd attributes in
1254 * nfsd4_proc_verify */
1255
1256 READ_BUF(4);
1257 verify->ve_attrlen = be32_to_cpup(p++);
1258 READ_BUF(verify->ve_attrlen);
1259 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1260
1261 DECODE_TAIL;
1262 }
1263
1264 static __be32
1265 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1266 {
1267 int avail;
1268 int len;
1269 DECODE_HEAD;
1270
1271 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1272 if (status)
1273 return status;
1274 READ_BUF(16);
1275 p = xdr_decode_hyper(p, &write->wr_offset);
1276 write->wr_stable_how = be32_to_cpup(p++);
1277 if (write->wr_stable_how > NFS_FILE_SYNC)
1278 goto xdr_error;
1279 write->wr_buflen = be32_to_cpup(p++);
1280
1281 /* Sorry .. no magic macros for this.. *
1282 * READ_BUF(write->wr_buflen);
1283 * SAVEMEM(write->wr_buf, write->wr_buflen);
1284 */
1285 avail = (char*)argp->end - (char*)argp->p;
1286 if (avail + argp->pagelen < write->wr_buflen) {
1287 dprintk("NFSD: xdr error (%s:%d)\n",
1288 __FILE__, __LINE__);
1289 goto xdr_error;
1290 }
1291 write->wr_head.iov_base = p;
1292 write->wr_head.iov_len = avail;
1293 write->wr_pagelist = argp->pagelist;
1294
1295 len = XDR_QUADLEN(write->wr_buflen) << 2;
1296 if (len >= avail) {
1297 int pages;
1298
1299 len -= avail;
1300
1301 pages = len >> PAGE_SHIFT;
1302 argp->pagelist += pages;
1303 argp->pagelen -= pages * PAGE_SIZE;
1304 len -= pages * PAGE_SIZE;
1305
1306 next_decode_page(argp);
1307 }
1308 argp->p += XDR_QUADLEN(len);
1309
1310 DECODE_TAIL;
1311 }
1312
1313 static __be32
1314 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1315 {
1316 DECODE_HEAD;
1317
1318 if (argp->minorversion >= 1)
1319 return nfserr_notsupp;
1320
1321 READ_BUF(12);
1322 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1323 rlockowner->rl_owner.len = be32_to_cpup(p++);
1324 READ_BUF(rlockowner->rl_owner.len);
1325 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1326
1327 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1328 return nfserr_inval;
1329 DECODE_TAIL;
1330 }
1331
1332 static __be32
1333 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1334 struct nfsd4_exchange_id *exid)
1335 {
1336 int dummy, tmp;
1337 DECODE_HEAD;
1338
1339 READ_BUF(NFS4_VERIFIER_SIZE);
1340 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1341
1342 status = nfsd4_decode_opaque(argp, &exid->clname);
1343 if (status)
1344 return nfserr_bad_xdr;
1345
1346 READ_BUF(4);
1347 exid->flags = be32_to_cpup(p++);
1348
1349 /* Ignore state_protect4_a */
1350 READ_BUF(4);
1351 exid->spa_how = be32_to_cpup(p++);
1352 switch (exid->spa_how) {
1353 case SP4_NONE:
1354 break;
1355 case SP4_MACH_CRED:
1356 /* spo_must_enforce */
1357 status = nfsd4_decode_bitmap(argp,
1358 exid->spo_must_enforce);
1359 if (status)
1360 goto out;
1361 /* spo_must_allow */
1362 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1363 if (status)
1364 goto out;
1365 break;
1366 case SP4_SSV:
1367 /* ssp_ops */
1368 READ_BUF(4);
1369 dummy = be32_to_cpup(p++);
1370 READ_BUF(dummy * 4);
1371 p += dummy;
1372
1373 READ_BUF(4);
1374 dummy = be32_to_cpup(p++);
1375 READ_BUF(dummy * 4);
1376 p += dummy;
1377
1378 /* ssp_hash_algs<> */
1379 READ_BUF(4);
1380 tmp = be32_to_cpup(p++);
1381 while (tmp--) {
1382 READ_BUF(4);
1383 dummy = be32_to_cpup(p++);
1384 READ_BUF(dummy);
1385 p += XDR_QUADLEN(dummy);
1386 }
1387
1388 /* ssp_encr_algs<> */
1389 READ_BUF(4);
1390 tmp = be32_to_cpup(p++);
1391 while (tmp--) {
1392 READ_BUF(4);
1393 dummy = be32_to_cpup(p++);
1394 READ_BUF(dummy);
1395 p += XDR_QUADLEN(dummy);
1396 }
1397
1398 /* ignore ssp_window and ssp_num_gss_handles: */
1399 READ_BUF(8);
1400 break;
1401 default:
1402 goto xdr_error;
1403 }
1404
1405 READ_BUF(4); /* nfs_impl_id4 array length */
1406 dummy = be32_to_cpup(p++);
1407
1408 if (dummy > 1)
1409 goto xdr_error;
1410
1411 if (dummy == 1) {
1412 status = nfsd4_decode_opaque(argp, &exid->nii_domain);
1413 if (status)
1414 goto xdr_error;
1415
1416 /* nii_name */
1417 status = nfsd4_decode_opaque(argp, &exid->nii_name);
1418 if (status)
1419 goto xdr_error;
1420
1421 /* nii_date */
1422 status = nfsd4_decode_time(argp, &exid->nii_time);
1423 if (status)
1424 goto xdr_error;
1425 }
1426 DECODE_TAIL;
1427 }
1428
1429 static __be32
1430 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1431 struct nfsd4_create_session *sess)
1432 {
1433 DECODE_HEAD;
1434
1435 READ_BUF(16);
1436 COPYMEM(&sess->clientid, 8);
1437 sess->seqid = be32_to_cpup(p++);
1438 sess->flags = be32_to_cpup(p++);
1439
1440 /* Fore channel attrs */
1441 READ_BUF(28);
1442 p++; /* headerpadsz is always 0 */
1443 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1444 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1445 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1446 sess->fore_channel.maxops = be32_to_cpup(p++);
1447 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1448 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1449 if (sess->fore_channel.nr_rdma_attrs == 1) {
1450 READ_BUF(4);
1451 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1452 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1453 dprintk("Too many fore channel attr bitmaps!\n");
1454 goto xdr_error;
1455 }
1456
1457 /* Back channel attrs */
1458 READ_BUF(28);
1459 p++; /* headerpadsz is always 0 */
1460 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1461 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1462 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1463 sess->back_channel.maxops = be32_to_cpup(p++);
1464 sess->back_channel.maxreqs = be32_to_cpup(p++);
1465 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1466 if (sess->back_channel.nr_rdma_attrs == 1) {
1467 READ_BUF(4);
1468 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1469 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1470 dprintk("Too many back channel attr bitmaps!\n");
1471 goto xdr_error;
1472 }
1473
1474 READ_BUF(4);
1475 sess->callback_prog = be32_to_cpup(p++);
1476 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1477 DECODE_TAIL;
1478 }
1479
1480 static __be32
1481 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1482 struct nfsd4_destroy_session *destroy_session)
1483 {
1484 DECODE_HEAD;
1485 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1486 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1487
1488 DECODE_TAIL;
1489 }
1490
1491 static __be32
1492 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1493 struct nfsd4_free_stateid *free_stateid)
1494 {
1495 DECODE_HEAD;
1496
1497 READ_BUF(sizeof(stateid_t));
1498 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1499 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1500
1501 DECODE_TAIL;
1502 }
1503
1504 static __be32
1505 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1506 struct nfsd4_sequence *seq)
1507 {
1508 DECODE_HEAD;
1509
1510 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1511 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1512 seq->seqid = be32_to_cpup(p++);
1513 seq->slotid = be32_to_cpup(p++);
1514 seq->maxslots = be32_to_cpup(p++);
1515 seq->cachethis = be32_to_cpup(p++);
1516
1517 DECODE_TAIL;
1518 }
1519
1520 static __be32
1521 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1522 {
1523 int i;
1524 __be32 *p, status;
1525 struct nfsd4_test_stateid_id *stateid;
1526
1527 READ_BUF(4);
1528 test_stateid->ts_num_ids = ntohl(*p++);
1529
1530 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1531
1532 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1533 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1534 if (!stateid) {
1535 status = nfserrno(-ENOMEM);
1536 goto out;
1537 }
1538
1539 INIT_LIST_HEAD(&stateid->ts_id_list);
1540 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1541
1542 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1543 if (status)
1544 goto out;
1545 }
1546
1547 status = 0;
1548 out:
1549 return status;
1550 xdr_error:
1551 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1552 status = nfserr_bad_xdr;
1553 goto out;
1554 }
1555
1556 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1557 {
1558 DECODE_HEAD;
1559
1560 READ_BUF(8);
1561 COPYMEM(&dc->clientid, 8);
1562
1563 DECODE_TAIL;
1564 }
1565
1566 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1567 {
1568 DECODE_HEAD;
1569
1570 READ_BUF(4);
1571 rc->rca_one_fs = be32_to_cpup(p++);
1572
1573 DECODE_TAIL;
1574 }
1575
1576 #ifdef CONFIG_NFSD_PNFS
1577 static __be32
1578 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1579 struct nfsd4_getdeviceinfo *gdev)
1580 {
1581 DECODE_HEAD;
1582 u32 num, i;
1583
1584 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1585 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1586 gdev->gd_layout_type = be32_to_cpup(p++);
1587 gdev->gd_maxcount = be32_to_cpup(p++);
1588 num = be32_to_cpup(p++);
1589 if (num) {
1590 if (num > 1000)
1591 goto xdr_error;
1592 READ_BUF(4 * num);
1593 gdev->gd_notify_types = be32_to_cpup(p++);
1594 for (i = 1; i < num; i++) {
1595 if (be32_to_cpup(p++)) {
1596 status = nfserr_inval;
1597 goto out;
1598 }
1599 }
1600 }
1601 DECODE_TAIL;
1602 }
1603
1604 static __be32
1605 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1606 struct nfsd4_layoutget *lgp)
1607 {
1608 DECODE_HEAD;
1609
1610 READ_BUF(36);
1611 lgp->lg_signal = be32_to_cpup(p++);
1612 lgp->lg_layout_type = be32_to_cpup(p++);
1613 lgp->lg_seg.iomode = be32_to_cpup(p++);
1614 p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1615 p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1616 p = xdr_decode_hyper(p, &lgp->lg_minlength);
1617
1618 status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1619 if (status)
1620 return status;
1621
1622 READ_BUF(4);
1623 lgp->lg_maxcount = be32_to_cpup(p++);
1624
1625 DECODE_TAIL;
1626 }
1627
1628 static __be32
1629 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1630 struct nfsd4_layoutcommit *lcp)
1631 {
1632 DECODE_HEAD;
1633 u32 timechange;
1634
1635 READ_BUF(20);
1636 p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1637 p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1638 lcp->lc_reclaim = be32_to_cpup(p++);
1639
1640 status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1641 if (status)
1642 return status;
1643
1644 READ_BUF(4);
1645 lcp->lc_newoffset = be32_to_cpup(p++);
1646 if (lcp->lc_newoffset) {
1647 READ_BUF(8);
1648 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1649 } else
1650 lcp->lc_last_wr = 0;
1651 READ_BUF(4);
1652 timechange = be32_to_cpup(p++);
1653 if (timechange) {
1654 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1655 if (status)
1656 return status;
1657 } else {
1658 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1659 }
1660 READ_BUF(8);
1661 lcp->lc_layout_type = be32_to_cpup(p++);
1662
1663 /*
1664 * Save the layout update in XDR format and let the layout driver deal
1665 * with it later.
1666 */
1667 lcp->lc_up_len = be32_to_cpup(p++);
1668 if (lcp->lc_up_len > 0) {
1669 READ_BUF(lcp->lc_up_len);
1670 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1671 }
1672
1673 DECODE_TAIL;
1674 }
1675
1676 static __be32
1677 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1678 struct nfsd4_layoutreturn *lrp)
1679 {
1680 DECODE_HEAD;
1681
1682 READ_BUF(16);
1683 lrp->lr_reclaim = be32_to_cpup(p++);
1684 lrp->lr_layout_type = be32_to_cpup(p++);
1685 lrp->lr_seg.iomode = be32_to_cpup(p++);
1686 lrp->lr_return_type = be32_to_cpup(p++);
1687 if (lrp->lr_return_type == RETURN_FILE) {
1688 READ_BUF(16);
1689 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1690 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1691
1692 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1693 if (status)
1694 return status;
1695
1696 READ_BUF(4);
1697 lrp->lrf_body_len = be32_to_cpup(p++);
1698 if (lrp->lrf_body_len > 0) {
1699 READ_BUF(lrp->lrf_body_len);
1700 READMEM(lrp->lrf_body, lrp->lrf_body_len);
1701 }
1702 } else {
1703 lrp->lr_seg.offset = 0;
1704 lrp->lr_seg.length = NFS4_MAX_UINT64;
1705 }
1706
1707 DECODE_TAIL;
1708 }
1709 #endif /* CONFIG_NFSD_PNFS */
1710
1711 static __be32
1712 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1713 struct nfsd4_fallocate *fallocate)
1714 {
1715 DECODE_HEAD;
1716
1717 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1718 if (status)
1719 return status;
1720
1721 READ_BUF(16);
1722 p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1723 xdr_decode_hyper(p, &fallocate->falloc_length);
1724
1725 DECODE_TAIL;
1726 }
1727
1728 static __be32
1729 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1730 {
1731 DECODE_HEAD;
1732
1733 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1734 if (status)
1735 return status;
1736 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1737 if (status)
1738 return status;
1739
1740 READ_BUF(8 + 8 + 8);
1741 p = xdr_decode_hyper(p, &clone->cl_src_pos);
1742 p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1743 p = xdr_decode_hyper(p, &clone->cl_count);
1744 DECODE_TAIL;
1745 }
1746
1747 static __be32
1748 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1749 {
1750 DECODE_HEAD;
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_offload_status(struct nfsd4_compoundargs *argp,
1772 struct nfsd4_offload_status *os)
1773 {
1774 return nfsd4_decode_stateid(argp, &os->stateid);
1775 }
1776
1777 static __be32
1778 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1779 {
1780 DECODE_HEAD;
1781
1782 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1783 if (status)
1784 return status;
1785
1786 READ_BUF(8 + 4);
1787 p = xdr_decode_hyper(p, &seek->seek_offset);
1788 seek->seek_whence = be32_to_cpup(p);
1789
1790 DECODE_TAIL;
1791 }
1792
1793 static __be32
1794 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1795 {
1796 return nfs_ok;
1797 }
1798
1799 static __be32
1800 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1801 {
1802 return nfserr_notsupp;
1803 }
1804
1805 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1806
1807 static const nfsd4_dec nfsd4_dec_ops[] = {
1808 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1809 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1810 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1811 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1812 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1813 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1814 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1815 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1816 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1817 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1818 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1819 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1820 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1821 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1822 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1823 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1824 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1825 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1826 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1827 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1828 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1829 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1830 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1831 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1832 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1833 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1834 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1835 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1836 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1837 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1838 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1839 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1840 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1841 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1842 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1843 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1844 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1845
1846 /* new operations for NFSv4.1 */
1847 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1848 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1849 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1850 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1851 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1852 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1853 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1854 #ifdef CONFIG_NFSD_PNFS
1855 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1856 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1857 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit,
1858 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget,
1859 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn,
1860 #else
1861 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1862 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1863 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1864 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1865 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1866 #endif
1867 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1868 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1869 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1870 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1871 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1872 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1873 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1874
1875 /* new operations for NFSv4.2 */
1876 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1877 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy,
1878 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
1879 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1880 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
1881 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
1882 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
1883 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_offload_status,
1884 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_offload_status,
1885 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1886 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
1887 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
1888 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone,
1889 };
1890
1891 static inline bool
1892 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1893 {
1894 if (op->opnum < FIRST_NFS4_OP)
1895 return false;
1896 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1897 return false;
1898 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1899 return false;
1900 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1901 return false;
1902 return true;
1903 }
1904
1905 static __be32
1906 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1907 {
1908 DECODE_HEAD;
1909 struct nfsd4_op *op;
1910 bool cachethis = false;
1911 int auth_slack= argp->rqstp->rq_auth_slack;
1912 int max_reply = auth_slack + 8; /* opcnt, status */
1913 int readcount = 0;
1914 int readbytes = 0;
1915 int i;
1916
1917 READ_BUF(4);
1918 argp->taglen = be32_to_cpup(p++);
1919 READ_BUF(argp->taglen);
1920 SAVEMEM(argp->tag, argp->taglen);
1921 READ_BUF(8);
1922 argp->minorversion = be32_to_cpup(p++);
1923 argp->opcnt = be32_to_cpup(p++);
1924 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1925
1926 if (argp->taglen > NFSD4_MAX_TAGLEN)
1927 goto xdr_error;
1928 /*
1929 * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
1930 * here, so we return success at the xdr level so that
1931 * nfsd4_proc can handle this is an NFS-level error.
1932 */
1933 if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1934 return 0;
1935
1936 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1937 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1938 if (!argp->ops) {
1939 argp->ops = argp->iops;
1940 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1941 goto xdr_error;
1942 }
1943 }
1944
1945 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1946 argp->opcnt = 0;
1947
1948 for (i = 0; i < argp->opcnt; i++) {
1949 op = &argp->ops[i];
1950 op->replay = NULL;
1951
1952 READ_BUF(4);
1953 op->opnum = be32_to_cpup(p++);
1954
1955 if (nfsd4_opnum_in_range(argp, op))
1956 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1957 else {
1958 op->opnum = OP_ILLEGAL;
1959 op->status = nfserr_op_illegal;
1960 }
1961 op->opdesc = OPDESC(op);
1962 /*
1963 * We'll try to cache the result in the DRC if any one
1964 * op in the compound wants to be cached:
1965 */
1966 cachethis |= nfsd4_cache_this_op(op);
1967
1968 if (op->opnum == OP_READ) {
1969 readcount++;
1970 readbytes += nfsd4_max_reply(argp->rqstp, op);
1971 } else
1972 max_reply += nfsd4_max_reply(argp->rqstp, op);
1973 /*
1974 * OP_LOCK and OP_LOCKT may return a conflicting lock.
1975 * (Special case because it will just skip encoding this
1976 * if it runs out of xdr buffer space, and it is the only
1977 * operation that behaves this way.)
1978 */
1979 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1980 max_reply += NFS4_OPAQUE_LIMIT;
1981
1982 if (op->status) {
1983 argp->opcnt = i+1;
1984 break;
1985 }
1986 }
1987 /* Sessions make the DRC unnecessary: */
1988 if (argp->minorversion)
1989 cachethis = false;
1990 svc_reserve(argp->rqstp, max_reply + readbytes);
1991 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1992
1993 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1994 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1995
1996 DECODE_TAIL;
1997 }
1998
1999 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
2000 struct svc_export *exp)
2001 {
2002 if (exp->ex_flags & NFSEXP_V4ROOT) {
2003 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
2004 *p++ = 0;
2005 } else if (IS_I_VERSION(inode)) {
2006 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2007 } else {
2008 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2009 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2010 }
2011 return p;
2012 }
2013
2014 /*
2015 * ctime (in NFSv4, time_metadata) is not writeable, and the client
2016 * doesn't really care what resolution could theoretically be stored by
2017 * the filesystem.
2018 *
2019 * The client cares how close together changes can be while still
2020 * guaranteeing ctime changes. For most filesystems (which have
2021 * timestamps with nanosecond fields) that is limited by the resolution
2022 * of the time returned from current_time() (which I'm assuming to be
2023 * 1/HZ).
2024 */
2025 static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2026 {
2027 struct timespec ts;
2028 u32 ns;
2029
2030 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2031 ts = ns_to_timespec(ns);
2032
2033 p = xdr_encode_hyper(p, ts.tv_sec);
2034 *p++ = cpu_to_be32(ts.tv_nsec);
2035
2036 return p;
2037 }
2038
2039 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2040 {
2041 *p++ = cpu_to_be32(c->atomic);
2042 if (c->change_supported) {
2043 p = xdr_encode_hyper(p, c->before_change);
2044 p = xdr_encode_hyper(p, c->after_change);
2045 } else {
2046 *p++ = cpu_to_be32(c->before_ctime_sec);
2047 *p++ = cpu_to_be32(c->before_ctime_nsec);
2048 *p++ = cpu_to_be32(c->after_ctime_sec);
2049 *p++ = cpu_to_be32(c->after_ctime_nsec);
2050 }
2051 return p;
2052 }
2053
2054 /* Encode as an array of strings the string given with components
2055 * separated @sep, escaped with esc_enter and esc_exit.
2056 */
2057 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2058 char *components, char esc_enter,
2059 char esc_exit)
2060 {
2061 __be32 *p;
2062 __be32 pathlen;
2063 int pathlen_offset;
2064 int strlen, count=0;
2065 char *str, *end, *next;
2066
2067 dprintk("nfsd4_encode_components(%s)\n", components);
2068
2069 pathlen_offset = xdr->buf->len;
2070 p = xdr_reserve_space(xdr, 4);
2071 if (!p)
2072 return nfserr_resource;
2073 p++; /* We will fill this in with @count later */
2074
2075 end = str = components;
2076 while (*end) {
2077 bool found_esc = false;
2078
2079 /* try to parse as esc_start, ..., esc_end, sep */
2080 if (*str == esc_enter) {
2081 for (; *end && (*end != esc_exit); end++)
2082 /* find esc_exit or end of string */;
2083 next = end + 1;
2084 if (*end && (!*next || *next == sep)) {
2085 str++;
2086 found_esc = true;
2087 }
2088 }
2089
2090 if (!found_esc)
2091 for (; *end && (*end != sep); end++)
2092 /* find sep or end of string */;
2093
2094 strlen = end - str;
2095 if (strlen) {
2096 p = xdr_reserve_space(xdr, strlen + 4);
2097 if (!p)
2098 return nfserr_resource;
2099 p = xdr_encode_opaque(p, str, strlen);
2100 count++;
2101 }
2102 else
2103 end++;
2104 if (found_esc)
2105 end = next;
2106
2107 str = end;
2108 }
2109 pathlen = htonl(count);
2110 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2111 return 0;
2112 }
2113
2114 /* Encode as an array of strings the string given with components
2115 * separated @sep.
2116 */
2117 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2118 char *components)
2119 {
2120 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2121 }
2122
2123 /*
2124 * encode a location element of a fs_locations structure
2125 */
2126 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2127 struct nfsd4_fs_location *location)
2128 {
2129 __be32 status;
2130
2131 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2132 '[', ']');
2133 if (status)
2134 return status;
2135 status = nfsd4_encode_components(xdr, '/', location->path);
2136 if (status)
2137 return status;
2138 return 0;
2139 }
2140
2141 /*
2142 * Encode a path in RFC3530 'pathname4' format
2143 */
2144 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2145 const struct path *root,
2146 const struct path *path)
2147 {
2148 struct path cur = *path;
2149 __be32 *p;
2150 struct dentry **components = NULL;
2151 unsigned int ncomponents = 0;
2152 __be32 err = nfserr_jukebox;
2153
2154 dprintk("nfsd4_encode_components(");
2155
2156 path_get(&cur);
2157 /* First walk the path up to the nfsd root, and store the
2158 * dentries/path components in an array.
2159 */
2160 for (;;) {
2161 if (path_equal(&cur, root))
2162 break;
2163 if (cur.dentry == cur.mnt->mnt_root) {
2164 if (follow_up(&cur))
2165 continue;
2166 goto out_free;
2167 }
2168 if ((ncomponents & 15) == 0) {
2169 struct dentry **new;
2170 new = krealloc(components,
2171 sizeof(*new) * (ncomponents + 16),
2172 GFP_KERNEL);
2173 if (!new)
2174 goto out_free;
2175 components = new;
2176 }
2177 components[ncomponents++] = cur.dentry;
2178 cur.dentry = dget_parent(cur.dentry);
2179 }
2180 err = nfserr_resource;
2181 p = xdr_reserve_space(xdr, 4);
2182 if (!p)
2183 goto out_free;
2184 *p++ = cpu_to_be32(ncomponents);
2185
2186 while (ncomponents) {
2187 struct dentry *dentry = components[ncomponents - 1];
2188 unsigned int len;
2189
2190 spin_lock(&dentry->d_lock);
2191 len = dentry->d_name.len;
2192 p = xdr_reserve_space(xdr, len + 4);
2193 if (!p) {
2194 spin_unlock(&dentry->d_lock);
2195 goto out_free;
2196 }
2197 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2198 dprintk("/%pd", dentry);
2199 spin_unlock(&dentry->d_lock);
2200 dput(dentry);
2201 ncomponents--;
2202 }
2203
2204 err = 0;
2205 out_free:
2206 dprintk(")\n");
2207 while (ncomponents)
2208 dput(components[--ncomponents]);
2209 kfree(components);
2210 path_put(&cur);
2211 return err;
2212 }
2213
2214 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2215 struct svc_rqst *rqstp, const struct path *path)
2216 {
2217 struct svc_export *exp_ps;
2218 __be32 res;
2219
2220 exp_ps = rqst_find_fsidzero_export(rqstp);
2221 if (IS_ERR(exp_ps))
2222 return nfserrno(PTR_ERR(exp_ps));
2223 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2224 exp_put(exp_ps);
2225 return res;
2226 }
2227
2228 /*
2229 * encode a fs_locations structure
2230 */
2231 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2232 struct svc_rqst *rqstp, struct svc_export *exp)
2233 {
2234 __be32 status;
2235 int i;
2236 __be32 *p;
2237 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2238
2239 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2240 if (status)
2241 return status;
2242 p = xdr_reserve_space(xdr, 4);
2243 if (!p)
2244 return nfserr_resource;
2245 *p++ = cpu_to_be32(fslocs->locations_count);
2246 for (i=0; i<fslocs->locations_count; i++) {
2247 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2248 if (status)
2249 return status;
2250 }
2251 return 0;
2252 }
2253
2254 static u32 nfs4_file_type(umode_t mode)
2255 {
2256 switch (mode & S_IFMT) {
2257 case S_IFIFO: return NF4FIFO;
2258 case S_IFCHR: return NF4CHR;
2259 case S_IFDIR: return NF4DIR;
2260 case S_IFBLK: return NF4BLK;
2261 case S_IFLNK: return NF4LNK;
2262 case S_IFREG: return NF4REG;
2263 case S_IFSOCK: return NF4SOCK;
2264 default: return NF4BAD;
2265 };
2266 }
2267
2268 static inline __be32
2269 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2270 struct nfs4_ace *ace)
2271 {
2272 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2273 return nfs4_acl_write_who(xdr, ace->whotype);
2274 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2275 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2276 else
2277 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2278 }
2279
2280 static inline __be32
2281 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2282 {
2283 __be32 *p;
2284 unsigned long i = hweight_long(layout_types);
2285
2286 p = xdr_reserve_space(xdr, 4 + 4 * i);
2287 if (!p)
2288 return nfserr_resource;
2289
2290 *p++ = cpu_to_be32(i);
2291
2292 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2293 if (layout_types & (1 << i))
2294 *p++ = cpu_to_be32(i);
2295
2296 return 0;
2297 }
2298
2299 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2300 FATTR4_WORD0_RDATTR_ERROR)
2301 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2302 #define WORD2_ABSENT_FS_ATTRS 0
2303
2304 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2305 static inline __be32
2306 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2307 void *context, int len)
2308 {
2309 __be32 *p;
2310
2311 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2312 if (!p)
2313 return nfserr_resource;
2314
2315 /*
2316 * For now we use a 0 here to indicate the null translation; in
2317 * the future we may place a call to translation code here.
2318 */
2319 *p++ = cpu_to_be32(0); /* lfs */
2320 *p++ = cpu_to_be32(0); /* pi */
2321 p = xdr_encode_opaque(p, context, len);
2322 return 0;
2323 }
2324 #else
2325 static inline __be32
2326 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2327 void *context, int len)
2328 { return 0; }
2329 #endif
2330
2331 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2332 {
2333 /* As per referral draft: */
2334 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2335 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2336 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2337 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2338 *rdattr_err = NFSERR_MOVED;
2339 else
2340 return nfserr_moved;
2341 }
2342 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2343 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2344 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2345 return 0;
2346 }
2347
2348
2349 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2350 {
2351 struct path path = exp->ex_path;
2352 int err;
2353
2354 path_get(&path);
2355 while (follow_up(&path)) {
2356 if (path.dentry != path.mnt->mnt_root)
2357 break;
2358 }
2359 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2360 path_put(&path);
2361 return err;
2362 }
2363
2364 static __be32
2365 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2366 {
2367 __be32 *p;
2368
2369 if (bmval2) {
2370 p = xdr_reserve_space(xdr, 16);
2371 if (!p)
2372 goto out_resource;
2373 *p++ = cpu_to_be32(3);
2374 *p++ = cpu_to_be32(bmval0);
2375 *p++ = cpu_to_be32(bmval1);
2376 *p++ = cpu_to_be32(bmval2);
2377 } else if (bmval1) {
2378 p = xdr_reserve_space(xdr, 12);
2379 if (!p)
2380 goto out_resource;
2381 *p++ = cpu_to_be32(2);
2382 *p++ = cpu_to_be32(bmval0);
2383 *p++ = cpu_to_be32(bmval1);
2384 } else {
2385 p = xdr_reserve_space(xdr, 8);
2386 if (!p)
2387 goto out_resource;
2388 *p++ = cpu_to_be32(1);
2389 *p++ = cpu_to_be32(bmval0);
2390 }
2391
2392 return 0;
2393 out_resource:
2394 return nfserr_resource;
2395 }
2396
2397 /*
2398 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2399 * ourselves.
2400 */
2401 static __be32
2402 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2403 struct svc_export *exp,
2404 struct dentry *dentry, u32 *bmval,
2405 struct svc_rqst *rqstp, int ignore_crossmnt)
2406 {
2407 u32 bmval0 = bmval[0];
2408 u32 bmval1 = bmval[1];
2409 u32 bmval2 = bmval[2];
2410 struct kstat stat;
2411 struct svc_fh *tempfh = NULL;
2412 struct kstatfs statfs;
2413 __be32 *p;
2414 int starting_len = xdr->buf->len;
2415 int attrlen_offset;
2416 __be32 attrlen;
2417 u32 dummy;
2418 u64 dummy64;
2419 u32 rdattr_err = 0;
2420 __be32 status;
2421 int err;
2422 struct nfs4_acl *acl = NULL;
2423 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2424 void *context = NULL;
2425 int contextlen;
2426 #endif
2427 bool contextsupport = false;
2428 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2429 u32 minorversion = resp->cstate.minorversion;
2430 struct path path = {
2431 .mnt = exp->ex_path.mnt,
2432 .dentry = dentry,
2433 };
2434 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2435
2436 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2437 BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2438
2439 if (exp->ex_fslocs.migrated) {
2440 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2441 if (status)
2442 goto out;
2443 }
2444
2445 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2446 if (err)
2447 goto out_nfserr;
2448 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2449 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2450 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2451 FATTR4_WORD1_SPACE_TOTAL))) {
2452 err = vfs_statfs(&path, &statfs);
2453 if (err)
2454 goto out_nfserr;
2455 }
2456 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2457 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2458 status = nfserr_jukebox;
2459 if (!tempfh)
2460 goto out;
2461 fh_init(tempfh, NFS4_FHSIZE);
2462 status = fh_compose(tempfh, exp, dentry, NULL);
2463 if (status)
2464 goto out;
2465 fhp = tempfh;
2466 }
2467 if (bmval0 & FATTR4_WORD0_ACL) {
2468 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2469 if (err == -EOPNOTSUPP)
2470 bmval0 &= ~FATTR4_WORD0_ACL;
2471 else if (err == -EINVAL) {
2472 status = nfserr_attrnotsupp;
2473 goto out;
2474 } else if (err != 0)
2475 goto out_nfserr;
2476 }
2477
2478 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2479 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2480 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2481 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2482 err = security_inode_getsecctx(d_inode(dentry),
2483 &context, &contextlen);
2484 else
2485 err = -EOPNOTSUPP;
2486 contextsupport = (err == 0);
2487 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2488 if (err == -EOPNOTSUPP)
2489 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2490 else if (err)
2491 goto out_nfserr;
2492 }
2493 }
2494 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2495
2496 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2497 if (status)
2498 goto out;
2499
2500 attrlen_offset = xdr->buf->len;
2501 p = xdr_reserve_space(xdr, 4);
2502 if (!p)
2503 goto out_resource;
2504 p++; /* to be backfilled later */
2505
2506 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2507 u32 supp[3];
2508
2509 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2510
2511 if (!IS_POSIXACL(dentry->d_inode))
2512 supp[0] &= ~FATTR4_WORD0_ACL;
2513 if (!contextsupport)
2514 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2515 if (!supp[2]) {
2516 p = xdr_reserve_space(xdr, 12);
2517 if (!p)
2518 goto out_resource;
2519 *p++ = cpu_to_be32(2);
2520 *p++ = cpu_to_be32(supp[0]);
2521 *p++ = cpu_to_be32(supp[1]);
2522 } else {
2523 p = xdr_reserve_space(xdr, 16);
2524 if (!p)
2525 goto out_resource;
2526 *p++ = cpu_to_be32(3);
2527 *p++ = cpu_to_be32(supp[0]);
2528 *p++ = cpu_to_be32(supp[1]);
2529 *p++ = cpu_to_be32(supp[2]);
2530 }
2531 }
2532 if (bmval0 & FATTR4_WORD0_TYPE) {
2533 p = xdr_reserve_space(xdr, 4);
2534 if (!p)
2535 goto out_resource;
2536 dummy = nfs4_file_type(stat.mode);
2537 if (dummy == NF4BAD) {
2538 status = nfserr_serverfault;
2539 goto out;
2540 }
2541 *p++ = cpu_to_be32(dummy);
2542 }
2543 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2544 p = xdr_reserve_space(xdr, 4);
2545 if (!p)
2546 goto out_resource;
2547 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2548 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2549 else
2550 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2551 NFS4_FH_VOL_RENAME);
2552 }
2553 if (bmval0 & FATTR4_WORD0_CHANGE) {
2554 p = xdr_reserve_space(xdr, 8);
2555 if (!p)
2556 goto out_resource;
2557 p = encode_change(p, &stat, d_inode(dentry), exp);
2558 }
2559 if (bmval0 & FATTR4_WORD0_SIZE) {
2560 p = xdr_reserve_space(xdr, 8);
2561 if (!p)
2562 goto out_resource;
2563 p = xdr_encode_hyper(p, stat.size);
2564 }
2565 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2566 p = xdr_reserve_space(xdr, 4);
2567 if (!p)
2568 goto out_resource;
2569 *p++ = cpu_to_be32(1);
2570 }
2571 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2572 p = xdr_reserve_space(xdr, 4);
2573 if (!p)
2574 goto out_resource;
2575 *p++ = cpu_to_be32(1);
2576 }
2577 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2578 p = xdr_reserve_space(xdr, 4);
2579 if (!p)
2580 goto out_resource;
2581 *p++ = cpu_to_be32(0);
2582 }
2583 if (bmval0 & FATTR4_WORD0_FSID) {
2584 p = xdr_reserve_space(xdr, 16);
2585 if (!p)
2586 goto out_resource;
2587 if (exp->ex_fslocs.migrated) {
2588 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2589 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2590 } else switch(fsid_source(fhp)) {
2591 case FSIDSOURCE_FSID:
2592 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2593 p = xdr_encode_hyper(p, (u64)0);
2594 break;
2595 case FSIDSOURCE_DEV:
2596 *p++ = cpu_to_be32(0);
2597 *p++ = cpu_to_be32(MAJOR(stat.dev));
2598 *p++ = cpu_to_be32(0);
2599 *p++ = cpu_to_be32(MINOR(stat.dev));
2600 break;
2601 case FSIDSOURCE_UUID:
2602 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2603 EX_UUID_LEN);
2604 break;
2605 }
2606 }
2607 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2608 p = xdr_reserve_space(xdr, 4);
2609 if (!p)
2610 goto out_resource;
2611 *p++ = cpu_to_be32(0);
2612 }
2613 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2614 p = xdr_reserve_space(xdr, 4);
2615 if (!p)
2616 goto out_resource;
2617 *p++ = cpu_to_be32(nn->nfsd4_lease);
2618 }
2619 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2620 p = xdr_reserve_space(xdr, 4);
2621 if (!p)
2622 goto out_resource;
2623 *p++ = cpu_to_be32(rdattr_err);
2624 }
2625 if (bmval0 & FATTR4_WORD0_ACL) {
2626 struct nfs4_ace *ace;
2627
2628 if (acl == NULL) {
2629 p = xdr_reserve_space(xdr, 4);
2630 if (!p)
2631 goto out_resource;
2632
2633 *p++ = cpu_to_be32(0);
2634 goto out_acl;
2635 }
2636 p = xdr_reserve_space(xdr, 4);
2637 if (!p)
2638 goto out_resource;
2639 *p++ = cpu_to_be32(acl->naces);
2640
2641 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2642 p = xdr_reserve_space(xdr, 4*3);
2643 if (!p)
2644 goto out_resource;
2645 *p++ = cpu_to_be32(ace->type);
2646 *p++ = cpu_to_be32(ace->flag);
2647 *p++ = cpu_to_be32(ace->access_mask &
2648 NFS4_ACE_MASK_ALL);
2649 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2650 if (status)
2651 goto out;
2652 }
2653 }
2654 out_acl:
2655 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2656 p = xdr_reserve_space(xdr, 4);
2657 if (!p)
2658 goto out_resource;
2659 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2660 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2661 }
2662 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2663 p = xdr_reserve_space(xdr, 4);
2664 if (!p)
2665 goto out_resource;
2666 *p++ = cpu_to_be32(1);
2667 }
2668 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2669 p = xdr_reserve_space(xdr, 4);
2670 if (!p)
2671 goto out_resource;
2672 *p++ = cpu_to_be32(0);
2673 }
2674 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2675 p = xdr_reserve_space(xdr, 4);
2676 if (!p)
2677 goto out_resource;
2678 *p++ = cpu_to_be32(1);
2679 }
2680 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2681 p = xdr_reserve_space(xdr, 4);
2682 if (!p)
2683 goto out_resource;
2684 *p++ = cpu_to_be32(1);
2685 }
2686 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2687 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2688 if (!p)
2689 goto out_resource;
2690 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2691 fhp->fh_handle.fh_size);
2692 }
2693 if (bmval0 & FATTR4_WORD0_FILEID) {
2694 p = xdr_reserve_space(xdr, 8);
2695 if (!p)
2696 goto out_resource;
2697 p = xdr_encode_hyper(p, stat.ino);
2698 }
2699 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2700 p = xdr_reserve_space(xdr, 8);
2701 if (!p)
2702 goto out_resource;
2703 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2704 }
2705 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2706 p = xdr_reserve_space(xdr, 8);
2707 if (!p)
2708 goto out_resource;
2709 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2710 }
2711 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2712 p = xdr_reserve_space(xdr, 8);
2713 if (!p)
2714 goto out_resource;
2715 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2716 }
2717 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2718 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2719 if (status)
2720 goto out;
2721 }
2722 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2723 p = xdr_reserve_space(xdr, 4);
2724 if (!p)
2725 goto out_resource;
2726 *p++ = cpu_to_be32(1);
2727 }
2728 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2729 p = xdr_reserve_space(xdr, 8);
2730 if (!p)
2731 goto out_resource;
2732 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2733 }
2734 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2735 p = xdr_reserve_space(xdr, 4);
2736 if (!p)
2737 goto out_resource;
2738 *p++ = cpu_to_be32(255);
2739 }
2740 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2741 p = xdr_reserve_space(xdr, 4);
2742 if (!p)
2743 goto out_resource;
2744 *p++ = cpu_to_be32(statfs.f_namelen);
2745 }
2746 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2747 p = xdr_reserve_space(xdr, 8);
2748 if (!p)
2749 goto out_resource;
2750 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2751 }
2752 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2753 p = xdr_reserve_space(xdr, 8);
2754 if (!p)
2755 goto out_resource;
2756 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2757 }
2758 if (bmval1 & FATTR4_WORD1_MODE) {
2759 p = xdr_reserve_space(xdr, 4);
2760 if (!p)
2761 goto out_resource;
2762 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2763 }
2764 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2765 p = xdr_reserve_space(xdr, 4);
2766 if (!p)
2767 goto out_resource;
2768 *p++ = cpu_to_be32(1);
2769 }
2770 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2771 p = xdr_reserve_space(xdr, 4);
2772 if (!p)
2773 goto out_resource;
2774 *p++ = cpu_to_be32(stat.nlink);
2775 }
2776 if (bmval1 & FATTR4_WORD1_OWNER) {
2777 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2778 if (status)
2779 goto out;
2780 }
2781 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2782 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2783 if (status)
2784 goto out;
2785 }
2786 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2787 p = xdr_reserve_space(xdr, 8);
2788 if (!p)
2789 goto out_resource;
2790 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2791 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2792 }
2793 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2794 p = xdr_reserve_space(xdr, 8);
2795 if (!p)
2796 goto out_resource;
2797 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2798 p = xdr_encode_hyper(p, dummy64);
2799 }
2800 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2801 p = xdr_reserve_space(xdr, 8);
2802 if (!p)
2803 goto out_resource;
2804 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2805 p = xdr_encode_hyper(p, dummy64);
2806 }
2807 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2808 p = xdr_reserve_space(xdr, 8);
2809 if (!p)
2810 goto out_resource;
2811 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2812 p = xdr_encode_hyper(p, dummy64);
2813 }
2814 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2815 p = xdr_reserve_space(xdr, 8);
2816 if (!p)
2817 goto out_resource;
2818 dummy64 = (u64)stat.blocks << 9;
2819 p = xdr_encode_hyper(p, dummy64);
2820 }
2821 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2822 p = xdr_reserve_space(xdr, 12);
2823 if (!p)
2824 goto out_resource;
2825 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2826 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2827 }
2828 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2829 p = xdr_reserve_space(xdr, 12);
2830 if (!p)
2831 goto out_resource;
2832 p = encode_time_delta(p, d_inode(dentry));
2833 }
2834 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2835 p = xdr_reserve_space(xdr, 12);
2836 if (!p)
2837 goto out_resource;
2838 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2839 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2840 }
2841 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2842 p = xdr_reserve_space(xdr, 12);
2843 if (!p)
2844 goto out_resource;
2845 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2846 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2847 }
2848 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2849 struct kstat parent_stat;
2850 u64 ino = stat.ino;
2851
2852 p = xdr_reserve_space(xdr, 8);
2853 if (!p)
2854 goto out_resource;
2855 /*
2856 * Get parent's attributes if not ignoring crossmount
2857 * and this is the root of a cross-mounted filesystem.
2858 */
2859 if (ignore_crossmnt == 0 &&
2860 dentry == exp->ex_path.mnt->mnt_root) {
2861 err = get_parent_attributes(exp, &parent_stat);
2862 if (err)
2863 goto out_nfserr;
2864 ino = parent_stat.ino;
2865 }
2866 p = xdr_encode_hyper(p, ino);
2867 }
2868 #ifdef CONFIG_NFSD_PNFS
2869 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2870 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2871 if (status)
2872 goto out;
2873 }
2874
2875 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2876 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2877 if (status)
2878 goto out;
2879 }
2880
2881 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2882 p = xdr_reserve_space(xdr, 4);
2883 if (!p)
2884 goto out_resource;
2885 *p++ = cpu_to_be32(stat.blksize);
2886 }
2887 #endif /* CONFIG_NFSD_PNFS */
2888 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2889 u32 supp[3];
2890
2891 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2892 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2893 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2894 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2895
2896 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2897 if (status)
2898 goto out;
2899 }
2900
2901 if (bmval2 & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
2902 p = xdr_reserve_space(xdr, 4);
2903 if (!p)
2904 goto out_resource;
2905 if (IS_I_VERSION(d_inode(dentry)))
2906 *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR);
2907 else
2908 *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_TIME_METADATA);
2909 }
2910
2911 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2912 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2913 status = nfsd4_encode_security_label(xdr, rqstp, context,
2914 contextlen);
2915 if (status)
2916 goto out;
2917 }
2918 #endif
2919
2920 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2921 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2922 status = nfs_ok;
2923
2924 out:
2925 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2926 if (context)
2927 security_release_secctx(context, contextlen);
2928 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2929 kfree(acl);
2930 if (tempfh) {
2931 fh_put(tempfh);
2932 kfree(tempfh);
2933 }
2934 if (status)
2935 xdr_truncate_encode(xdr, starting_len);
2936 return status;
2937 out_nfserr:
2938 status = nfserrno(err);
2939 goto out;
2940 out_resource:
2941 status = nfserr_resource;
2942 goto out;
2943 }
2944
2945 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2946 struct xdr_buf *buf, __be32 *p, int bytes)
2947 {
2948 xdr->scratch.iov_len = 0;
2949 memset(buf, 0, sizeof(struct xdr_buf));
2950 buf->head[0].iov_base = p;
2951 buf->head[0].iov_len = 0;
2952 buf->len = 0;
2953 xdr->buf = buf;
2954 xdr->iov = buf->head;
2955 xdr->p = p;
2956 xdr->end = (void *)p + bytes;
2957 buf->buflen = bytes;
2958 }
2959
2960 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2961 struct svc_fh *fhp, struct svc_export *exp,
2962 struct dentry *dentry, u32 *bmval,
2963 struct svc_rqst *rqstp, int ignore_crossmnt)
2964 {
2965 struct xdr_buf dummy;
2966 struct xdr_stream xdr;
2967 __be32 ret;
2968
2969 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2970 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2971 ignore_crossmnt);
2972 *p = xdr.p;
2973 return ret;
2974 }
2975
2976 static inline int attributes_need_mount(u32 *bmval)
2977 {
2978 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2979 return 1;
2980 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2981 return 1;
2982 return 0;
2983 }
2984
2985 static __be32
2986 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2987 const char *name, int namlen)
2988 {
2989 struct svc_export *exp = cd->rd_fhp->fh_export;
2990 struct dentry *dentry;
2991 __be32 nfserr;
2992 int ignore_crossmnt = 0;
2993
2994 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2995 if (IS_ERR(dentry))
2996 return nfserrno(PTR_ERR(dentry));
2997
2998 exp_get(exp);
2999 /*
3000 * In the case of a mountpoint, the client may be asking for
3001 * attributes that are only properties of the underlying filesystem
3002 * as opposed to the cross-mounted file system. In such a case,
3003 * we will not follow the cross mount and will fill the attribtutes
3004 * directly from the mountpoint dentry.
3005 */
3006 if (nfsd_mountpoint(dentry, exp)) {
3007 int err;
3008
3009 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3010 && !attributes_need_mount(cd->rd_bmval)) {
3011 ignore_crossmnt = 1;
3012 goto out_encode;
3013 }
3014 /*
3015 * Why the heck aren't we just using nfsd_lookup??
3016 * Different "."/".." handling? Something else?
3017 * At least, add a comment here to explain....
3018 */
3019 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3020 if (err) {
3021 nfserr = nfserrno(err);
3022 goto out_put;
3023 }
3024 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3025 if (nfserr)
3026 goto out_put;
3027
3028 }
3029 out_encode:
3030 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3031 cd->rd_rqstp, ignore_crossmnt);
3032 out_put:
3033 dput(dentry);
3034 exp_put(exp);
3035 return nfserr;
3036 }
3037
3038 static __be32 *
3039 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3040 {
3041 __be32 *p;
3042
3043 p = xdr_reserve_space(xdr, 20);
3044 if (!p)
3045 return NULL;
3046 *p++ = htonl(2);
3047 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3048 *p++ = htonl(0); /* bmval1 */
3049
3050 *p++ = htonl(4); /* attribute length */
3051 *p++ = nfserr; /* no htonl */
3052 return p;
3053 }
3054
3055 static int
3056 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3057 loff_t offset, u64 ino, unsigned int d_type)
3058 {
3059 struct readdir_cd *ccd = ccdv;
3060 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3061 struct xdr_stream *xdr = cd->xdr;
3062 int start_offset = xdr->buf->len;
3063 int cookie_offset;
3064 u32 name_and_cookie;
3065 int entry_bytes;
3066 __be32 nfserr = nfserr_toosmall;
3067 __be64 wire_offset;
3068 __be32 *p;
3069
3070 /* In nfsv4, "." and ".." never make it onto the wire.. */
3071 if (name && isdotent(name, namlen)) {
3072 cd->common.err = nfs_ok;
3073 return 0;
3074 }
3075
3076 if (cd->cookie_offset) {
3077 wire_offset = cpu_to_be64(offset);
3078 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3079 &wire_offset, 8);
3080 }
3081
3082 p = xdr_reserve_space(xdr, 4);
3083 if (!p)
3084 goto fail;
3085 *p++ = xdr_one; /* mark entry present */
3086 cookie_offset = xdr->buf->len;
3087 p = xdr_reserve_space(xdr, 3*4 + namlen);
3088 if (!p)
3089 goto fail;
3090 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
3091 p = xdr_encode_array(p, name, namlen); /* name length & name */
3092
3093 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3094 switch (nfserr) {
3095 case nfs_ok:
3096 break;
3097 case nfserr_resource:
3098 nfserr = nfserr_toosmall;
3099 goto fail;
3100 case nfserr_noent:
3101 xdr_truncate_encode(xdr, start_offset);
3102 goto skip_entry;
3103 default:
3104 /*
3105 * If the client requested the RDATTR_ERROR attribute,
3106 * we stuff the error code into this attribute
3107 * and continue. If this attribute was not requested,
3108 * then in accordance with the spec, we fail the
3109 * entire READDIR operation(!)
3110 */
3111 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3112 goto fail;
3113 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3114 if (p == NULL) {
3115 nfserr = nfserr_toosmall;
3116 goto fail;
3117 }
3118 }
3119 nfserr = nfserr_toosmall;
3120 entry_bytes = xdr->buf->len - start_offset;
3121 if (entry_bytes > cd->rd_maxcount)
3122 goto fail;
3123 cd->rd_maxcount -= entry_bytes;
3124 /*
3125 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3126 * let's always let through the first entry, at least:
3127 */
3128 if (!cd->rd_dircount)
3129 goto fail;
3130 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3131 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3132 goto fail;
3133 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3134
3135 cd->cookie_offset = cookie_offset;
3136 skip_entry:
3137 cd->common.err = nfs_ok;
3138 return 0;
3139 fail:
3140 xdr_truncate_encode(xdr, start_offset);
3141 cd->common.err = nfserr;
3142 return -EINVAL;
3143 }
3144
3145 static __be32
3146 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3147 {
3148 __be32 *p;
3149
3150 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3151 if (!p)
3152 return nfserr_resource;
3153 *p++ = cpu_to_be32(sid->si_generation);
3154 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3155 sizeof(stateid_opaque_t));
3156 return 0;
3157 }
3158
3159 static __be32
3160 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3161 {
3162 struct xdr_stream *xdr = &resp->xdr;
3163 __be32 *p;
3164
3165 p = xdr_reserve_space(xdr, 8);
3166 if (!p)
3167 return nfserr_resource;
3168 *p++ = cpu_to_be32(access->ac_supported);
3169 *p++ = cpu_to_be32(access->ac_resp_access);
3170 return 0;
3171 }
3172
3173 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3174 {
3175 struct xdr_stream *xdr = &resp->xdr;
3176 __be32 *p;
3177
3178 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3179 if (!p)
3180 return nfserr_resource;
3181 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3182 NFS4_MAX_SESSIONID_LEN);
3183 *p++ = cpu_to_be32(bcts->dir);
3184 /* Upshifting from TCP to RDMA is not supported */
3185 *p++ = cpu_to_be32(0);
3186 return 0;
3187 }
3188
3189 static __be32
3190 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3191 {
3192 struct xdr_stream *xdr = &resp->xdr;
3193
3194 return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3195 }
3196
3197
3198 static __be32
3199 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3200 {
3201 struct xdr_stream *xdr = &resp->xdr;
3202 __be32 *p;
3203
3204 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3205 if (!p)
3206 return nfserr_resource;
3207 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3208 NFS4_VERIFIER_SIZE);
3209 return 0;
3210 }
3211
3212 static __be32
3213 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3214 {
3215 struct xdr_stream *xdr = &resp->xdr;
3216 __be32 *p;
3217
3218 p = xdr_reserve_space(xdr, 20);
3219 if (!p)
3220 return nfserr_resource;
3221 encode_cinfo(p, &create->cr_cinfo);
3222 return nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3223 create->cr_bmval[1], create->cr_bmval[2]);
3224 }
3225
3226 static __be32
3227 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3228 {
3229 struct svc_fh *fhp = getattr->ga_fhp;
3230 struct xdr_stream *xdr = &resp->xdr;
3231
3232 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3233 getattr->ga_bmval, resp->rqstp, 0);
3234 }
3235
3236 static __be32
3237 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3238 {
3239 struct xdr_stream *xdr = &resp->xdr;
3240 struct svc_fh *fhp = *fhpp;
3241 unsigned int len;
3242 __be32 *p;
3243
3244 len = fhp->fh_handle.fh_size;
3245 p = xdr_reserve_space(xdr, len + 4);
3246 if (!p)
3247 return nfserr_resource;
3248 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3249 return 0;
3250 }
3251
3252 /*
3253 * Including all fields other than the name, a LOCK4denied structure requires
3254 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3255 */
3256 static __be32
3257 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3258 {
3259 struct xdr_netobj *conf = &ld->ld_owner;
3260 __be32 *p;
3261
3262 again:
3263 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3264 if (!p) {
3265 /*
3266 * Don't fail to return the result just because we can't
3267 * return the conflicting open:
3268 */
3269 if (conf->len) {
3270 kfree(conf->data);
3271 conf->len = 0;
3272 conf->data = NULL;
3273 goto again;
3274 }
3275 return nfserr_resource;
3276 }
3277 p = xdr_encode_hyper(p, ld->ld_start);
3278 p = xdr_encode_hyper(p, ld->ld_length);
3279 *p++ = cpu_to_be32(ld->ld_type);
3280 if (conf->len) {
3281 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3282 p = xdr_encode_opaque(p, conf->data, conf->len);
3283 kfree(conf->data);
3284 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
3285 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3286 *p++ = cpu_to_be32(0); /* length of owner name */
3287 }
3288 return nfserr_denied;
3289 }
3290
3291 static __be32
3292 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3293 {
3294 struct xdr_stream *xdr = &resp->xdr;
3295
3296 if (!nfserr)
3297 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3298 else if (nfserr == nfserr_denied)
3299 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3300
3301 return nfserr;
3302 }
3303
3304 static __be32
3305 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3306 {
3307 struct xdr_stream *xdr = &resp->xdr;
3308
3309 if (nfserr == nfserr_denied)
3310 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3311 return nfserr;
3312 }
3313
3314 static __be32
3315 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3316 {
3317 struct xdr_stream *xdr = &resp->xdr;
3318
3319 return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3320 }
3321
3322
3323 static __be32
3324 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3325 {
3326 struct xdr_stream *xdr = &resp->xdr;
3327 __be32 *p;
3328
3329 p = xdr_reserve_space(xdr, 20);
3330 if (!p)
3331 return nfserr_resource;
3332 p = encode_cinfo(p, &link->li_cinfo);
3333 return 0;
3334 }
3335
3336
3337 static __be32
3338 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3339 {
3340 struct xdr_stream *xdr = &resp->xdr;
3341 __be32 *p;
3342
3343 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3344 if (nfserr)
3345 return nfserr;
3346 p = xdr_reserve_space(xdr, 24);
3347 if (!p)
3348 return nfserr_resource;
3349 p = encode_cinfo(p, &open->op_cinfo);
3350 *p++ = cpu_to_be32(open->op_rflags);
3351
3352 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3353 open->op_bmval[2]);
3354 if (nfserr)
3355 return nfserr;
3356
3357 p = xdr_reserve_space(xdr, 4);
3358 if (!p)
3359 return nfserr_resource;
3360
3361 *p++ = cpu_to_be32(open->op_delegate_type);
3362 switch (open->op_delegate_type) {
3363 case NFS4_OPEN_DELEGATE_NONE:
3364 break;
3365 case NFS4_OPEN_DELEGATE_READ:
3366 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3367 if (nfserr)
3368 return nfserr;
3369 p = xdr_reserve_space(xdr, 20);
3370 if (!p)
3371 return nfserr_resource;
3372 *p++ = cpu_to_be32(open->op_recall);
3373
3374 /*
3375 * TODO: ACE's in delegations
3376 */
3377 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3378 *p++ = cpu_to_be32(0);
3379 *p++ = cpu_to_be32(0);
3380 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3381 break;
3382 case NFS4_OPEN_DELEGATE_WRITE:
3383 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3384 if (nfserr)
3385 return nfserr;
3386 p = xdr_reserve_space(xdr, 32);
3387 if (!p)
3388 return nfserr_resource;
3389 *p++ = cpu_to_be32(0);
3390
3391 /*
3392 * TODO: space_limit's in delegations
3393 */
3394 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3395 *p++ = cpu_to_be32(~(u32)0);
3396 *p++ = cpu_to_be32(~(u32)0);
3397
3398 /*
3399 * TODO: ACE's in delegations
3400 */
3401 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3402 *p++ = cpu_to_be32(0);
3403 *p++ = cpu_to_be32(0);
3404 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3405 break;
3406 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3407 switch (open->op_why_no_deleg) {
3408 case WND4_CONTENTION:
3409 case WND4_RESOURCE:
3410 p = xdr_reserve_space(xdr, 8);
3411 if (!p)
3412 return nfserr_resource;
3413 *p++ = cpu_to_be32(open->op_why_no_deleg);
3414 /* deleg signaling not supported yet: */
3415 *p++ = cpu_to_be32(0);
3416 break;
3417 default:
3418 p = xdr_reserve_space(xdr, 4);
3419 if (!p)
3420 return nfserr_resource;
3421 *p++ = cpu_to_be32(open->op_why_no_deleg);
3422 }
3423 break;
3424 default:
3425 BUG();
3426 }
3427 /* XXX save filehandle here */
3428 return 0;
3429 }
3430
3431 static __be32
3432 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3433 {
3434 struct xdr_stream *xdr = &resp->xdr;
3435
3436 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3437 }
3438
3439 static __be32
3440 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3441 {
3442 struct xdr_stream *xdr = &resp->xdr;
3443
3444 return nfsd4_encode_stateid(xdr, &od->od_stateid);
3445 }
3446
3447 static __be32 nfsd4_encode_splice_read(
3448 struct nfsd4_compoundres *resp,
3449 struct nfsd4_read *read,
3450 struct file *file, unsigned long maxcount)
3451 {
3452 struct xdr_stream *xdr = &resp->xdr;
3453 struct xdr_buf *buf = xdr->buf;
3454 u32 eof;
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 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3464 file, read->rd_offset, &maxcount, &eof);
3465 read->rd_length = maxcount;
3466 if (nfserr) {
3467 /*
3468 * nfsd_splice_actor may have already messed with the
3469 * page length; reset it so as not to confuse
3470 * xdr_truncate_encode:
3471 */
3472 buf->page_len = 0;
3473 return nfserr;
3474 }
3475
3476 *(p++) = htonl(eof);
3477 *(p++) = htonl(maxcount);
3478
3479 buf->page_len = maxcount;
3480 buf->len += maxcount;
3481 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3482 / PAGE_SIZE;
3483
3484 /* Use rest of head for padding and remaining ops: */
3485 buf->tail[0].iov_base = xdr->p;
3486 buf->tail[0].iov_len = 0;
3487 xdr->iov = buf->tail;
3488 if (maxcount&3) {
3489 int pad = 4 - (maxcount&3);
3490
3491 *(xdr->p++) = 0;
3492
3493 buf->tail[0].iov_base += maxcount&3;
3494 buf->tail[0].iov_len = pad;
3495 buf->len += pad;
3496 }
3497
3498 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3499 buf->buflen - buf->len);
3500 buf->buflen = buf->len + space_left;
3501 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3502
3503 return 0;
3504 }
3505
3506 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3507 struct nfsd4_read *read,
3508 struct file *file, unsigned long maxcount)
3509 {
3510 struct xdr_stream *xdr = &resp->xdr;
3511 u32 eof;
3512 int v;
3513 int starting_len = xdr->buf->len - 8;
3514 long len;
3515 int thislen;
3516 __be32 nfserr;
3517 __be32 tmp;
3518 __be32 *p;
3519 u32 zzz = 0;
3520 int pad;
3521
3522 len = maxcount;
3523 v = 0;
3524
3525 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3526 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3527 WARN_ON_ONCE(!p);
3528 resp->rqstp->rq_vec[v].iov_base = p;
3529 resp->rqstp->rq_vec[v].iov_len = thislen;
3530 v++;
3531 len -= thislen;
3532
3533 while (len) {
3534 thislen = min_t(long, len, PAGE_SIZE);
3535 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3536 WARN_ON_ONCE(!p);
3537 resp->rqstp->rq_vec[v].iov_base = p;
3538 resp->rqstp->rq_vec[v].iov_len = thislen;
3539 v++;
3540 len -= thislen;
3541 }
3542 read->rd_vlen = v;
3543
3544 len = maxcount;
3545 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3546 resp->rqstp->rq_vec, read->rd_vlen, &maxcount,
3547 &eof);
3548 read->rd_length = maxcount;
3549 if (nfserr)
3550 return nfserr;
3551 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3552
3553 tmp = htonl(eof);
3554 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3555 tmp = htonl(maxcount);
3556 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3557
3558 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3559 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3560 &zzz, pad);
3561 return 0;
3562
3563 }
3564
3565 static __be32
3566 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3567 struct nfsd4_read *read)
3568 {
3569 unsigned long maxcount;
3570 struct xdr_stream *xdr = &resp->xdr;
3571 struct file *file;
3572 int starting_len = xdr->buf->len;
3573 __be32 *p;
3574
3575 if (nfserr)
3576 return nfserr;
3577 file = read->rd_nf->nf_file;
3578
3579 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3580 if (!p) {
3581 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3582 return nfserr_resource;
3583 }
3584 if (resp->xdr.buf->page_len &&
3585 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3586 WARN_ON_ONCE(1);
3587 return nfserr_resource;
3588 }
3589 xdr_commit_encode(xdr);
3590
3591 maxcount = svc_max_payload(resp->rqstp);
3592 maxcount = min_t(unsigned long, maxcount,
3593 (xdr->buf->buflen - xdr->buf->len));
3594 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3595
3596 if (file->f_op->splice_read &&
3597 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3598 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3599 else
3600 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3601
3602 if (nfserr)
3603 xdr_truncate_encode(xdr, starting_len);
3604
3605 return nfserr;
3606 }
3607
3608 static __be32
3609 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3610 {
3611 int maxcount;
3612 __be32 wire_count;
3613 int zero = 0;
3614 struct xdr_stream *xdr = &resp->xdr;
3615 int length_offset = xdr->buf->len;
3616 __be32 *p;
3617
3618 p = xdr_reserve_space(xdr, 4);
3619 if (!p)
3620 return nfserr_resource;
3621 maxcount = PAGE_SIZE;
3622
3623 p = xdr_reserve_space(xdr, maxcount);
3624 if (!p)
3625 return nfserr_resource;
3626 /*
3627 * XXX: By default, vfs_readlink() will truncate symlinks if they
3628 * would overflow the buffer. Is this kosher in NFSv4? If not, one
3629 * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3630 * that truncation occurred, and return NFS4ERR_RESOURCE.
3631 */
3632 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3633 (char *)p, &maxcount);
3634 if (nfserr == nfserr_isdir)
3635 nfserr = nfserr_inval;
3636 if (nfserr) {
3637 xdr_truncate_encode(xdr, length_offset);
3638 return nfserr;
3639 }
3640
3641 wire_count = htonl(maxcount);
3642 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3643 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3644 if (maxcount & 3)
3645 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3646 &zero, 4 - (maxcount&3));
3647 return 0;
3648 }
3649
3650 static __be32
3651 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3652 {
3653 int maxcount;
3654 int bytes_left;
3655 loff_t offset;
3656 __be64 wire_offset;
3657 struct xdr_stream *xdr = &resp->xdr;
3658 int starting_len = xdr->buf->len;
3659 __be32 *p;
3660
3661 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3662 if (!p)
3663 return nfserr_resource;
3664
3665 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3666 *p++ = cpu_to_be32(0);
3667 *p++ = cpu_to_be32(0);
3668 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3669 - (char *)resp->xdr.buf->head[0].iov_base;
3670
3671 /*
3672 * Number of bytes left for directory entries allowing for the
3673 * final 8 bytes of the readdir and a following failed op:
3674 */
3675 bytes_left = xdr->buf->buflen - xdr->buf->len
3676 - COMPOUND_ERR_SLACK_SPACE - 8;
3677 if (bytes_left < 0) {
3678 nfserr = nfserr_resource;
3679 goto err_no_verf;
3680 }
3681 maxcount = svc_max_payload(resp->rqstp);
3682 maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3683 /*
3684 * Note the rfc defines rd_maxcount as the size of the
3685 * READDIR4resok structure, which includes the verifier above
3686 * and the 8 bytes encoded at the end of this function:
3687 */
3688 if (maxcount < 16) {
3689 nfserr = nfserr_toosmall;
3690 goto err_no_verf;
3691 }
3692 maxcount = min_t(int, maxcount-16, bytes_left);
3693
3694 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3695 if (!readdir->rd_dircount)
3696 readdir->rd_dircount = svc_max_payload(resp->rqstp);
3697
3698 readdir->xdr = xdr;
3699 readdir->rd_maxcount = maxcount;
3700 readdir->common.err = 0;
3701 readdir->cookie_offset = 0;
3702
3703 offset = readdir->rd_cookie;
3704 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3705 &offset,
3706 &readdir->common, nfsd4_encode_dirent);
3707 if (nfserr == nfs_ok &&
3708 readdir->common.err == nfserr_toosmall &&
3709 xdr->buf->len == starting_len + 8) {
3710 /* nothing encoded; which limit did we hit?: */
3711 if (maxcount - 16 < bytes_left)
3712 /* It was the fault of rd_maxcount: */
3713 nfserr = nfserr_toosmall;
3714 else
3715 /* We ran out of buffer space: */
3716 nfserr = nfserr_resource;
3717 }
3718 if (nfserr)
3719 goto err_no_verf;
3720
3721 if (readdir->cookie_offset) {
3722 wire_offset = cpu_to_be64(offset);
3723 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3724 &wire_offset, 8);
3725 }
3726
3727 p = xdr_reserve_space(xdr, 8);
3728 if (!p) {
3729 WARN_ON_ONCE(1);
3730 goto err_no_verf;
3731 }
3732 *p++ = 0; /* no more entries */
3733 *p++ = htonl(readdir->common.err == nfserr_eof);
3734
3735 return 0;
3736 err_no_verf:
3737 xdr_truncate_encode(xdr, starting_len);
3738 return nfserr;
3739 }
3740
3741 static __be32
3742 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3743 {
3744 struct xdr_stream *xdr = &resp->xdr;
3745 __be32 *p;
3746
3747 p = xdr_reserve_space(xdr, 20);
3748 if (!p)
3749 return nfserr_resource;
3750 p = encode_cinfo(p, &remove->rm_cinfo);
3751 return 0;
3752 }
3753
3754 static __be32
3755 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3756 {
3757 struct xdr_stream *xdr = &resp->xdr;
3758 __be32 *p;
3759
3760 p = xdr_reserve_space(xdr, 40);
3761 if (!p)
3762 return nfserr_resource;
3763 p = encode_cinfo(p, &rename->rn_sinfo);
3764 p = encode_cinfo(p, &rename->rn_tinfo);
3765 return 0;
3766 }
3767
3768 static __be32
3769 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
3770 {
3771 u32 i, nflavs, supported;
3772 struct exp_flavor_info *flavs;
3773 struct exp_flavor_info def_flavs[2];
3774 __be32 *p, *flavorsp;
3775 static bool report = true;
3776
3777 if (exp->ex_nflavors) {
3778 flavs = exp->ex_flavors;
3779 nflavs = exp->ex_nflavors;
3780 } else { /* Handling of some defaults in absence of real secinfo: */
3781 flavs = def_flavs;
3782 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3783 nflavs = 2;
3784 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3785 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3786 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3787 nflavs = 1;
3788 flavs[0].pseudoflavor
3789 = svcauth_gss_flavor(exp->ex_client);
3790 } else {
3791 nflavs = 1;
3792 flavs[0].pseudoflavor
3793 = exp->ex_client->flavour->flavour;
3794 }
3795 }
3796
3797 supported = 0;
3798 p = xdr_reserve_space(xdr, 4);
3799 if (!p)
3800 return nfserr_resource;
3801 flavorsp = p++; /* to be backfilled later */
3802
3803 for (i = 0; i < nflavs; i++) {
3804 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3805 struct rpcsec_gss_info info;
3806
3807 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3808 supported++;
3809 p = xdr_reserve_space(xdr, 4 + 4 +
3810 XDR_LEN(info.oid.len) + 4 + 4);
3811 if (!p)
3812 return nfserr_resource;
3813 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3814 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3815 *p++ = cpu_to_be32(info.qop);
3816 *p++ = cpu_to_be32(info.service);
3817 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3818 supported++;
3819 p = xdr_reserve_space(xdr, 4);
3820 if (!p)
3821 return nfserr_resource;
3822 *p++ = cpu_to_be32(pf);
3823 } else {
3824 if (report)
3825 pr_warn("NFS: SECINFO: security flavor %u "
3826 "is not supported\n", pf);
3827 }
3828 }
3829
3830 if (nflavs != supported)
3831 report = false;
3832 *flavorsp = htonl(supported);
3833 return 0;
3834 }
3835
3836 static __be32
3837 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3838 struct nfsd4_secinfo *secinfo)
3839 {
3840 struct xdr_stream *xdr = &resp->xdr;
3841
3842 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
3843 }
3844
3845 static __be32
3846 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3847 struct nfsd4_secinfo_no_name *secinfo)
3848 {
3849 struct xdr_stream *xdr = &resp->xdr;
3850
3851 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
3852 }
3853
3854 /*
3855 * The SETATTR encode routine is special -- it always encodes a bitmap,
3856 * regardless of the error status.
3857 */
3858 static __be32
3859 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3860 {
3861 struct xdr_stream *xdr = &resp->xdr;
3862 __be32 *p;
3863
3864 p = xdr_reserve_space(xdr, 16);
3865 if (!p)
3866 return nfserr_resource;
3867 if (nfserr) {
3868 *p++ = cpu_to_be32(3);
3869 *p++ = cpu_to_be32(0);
3870 *p++ = cpu_to_be32(0);
3871 *p++ = cpu_to_be32(0);
3872 }
3873 else {
3874 *p++ = cpu_to_be32(3);
3875 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3876 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3877 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3878 }
3879 return nfserr;
3880 }
3881
3882 static __be32
3883 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3884 {
3885 struct xdr_stream *xdr = &resp->xdr;
3886 __be32 *p;
3887
3888 if (!nfserr) {
3889 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3890 if (!p)
3891 return nfserr_resource;
3892 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3893 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3894 NFS4_VERIFIER_SIZE);
3895 }
3896 else if (nfserr == nfserr_clid_inuse) {
3897 p = xdr_reserve_space(xdr, 8);
3898 if (!p)
3899 return nfserr_resource;
3900 *p++ = cpu_to_be32(0);
3901 *p++ = cpu_to_be32(0);
3902 }
3903 return nfserr;
3904 }
3905
3906 static __be32
3907 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3908 {
3909 struct xdr_stream *xdr = &resp->xdr;
3910 __be32 *p;
3911
3912 p = xdr_reserve_space(xdr, 16);
3913 if (!p)
3914 return nfserr_resource;
3915 *p++ = cpu_to_be32(write->wr_bytes_written);
3916 *p++ = cpu_to_be32(write->wr_how_written);
3917 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3918 NFS4_VERIFIER_SIZE);
3919 return 0;
3920 }
3921
3922 static __be32
3923 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3924 struct nfsd4_exchange_id *exid)
3925 {
3926 struct xdr_stream *xdr = &resp->xdr;
3927 __be32 *p;
3928 char *major_id;
3929 char *server_scope;
3930 int major_id_sz;
3931 int server_scope_sz;
3932 uint64_t minor_id = 0;
3933
3934 major_id = utsname()->nodename;
3935 major_id_sz = strlen(major_id);
3936 server_scope = utsname()->nodename;
3937 server_scope_sz = strlen(server_scope);
3938
3939 p = xdr_reserve_space(xdr,
3940 8 /* eir_clientid */ +
3941 4 /* eir_sequenceid */ +
3942 4 /* eir_flags */ +
3943 4 /* spr_how */);
3944 if (!p)
3945 return nfserr_resource;
3946
3947 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3948 *p++ = cpu_to_be32(exid->seqid);
3949 *p++ = cpu_to_be32(exid->flags);
3950
3951 *p++ = cpu_to_be32(exid->spa_how);
3952
3953 switch (exid->spa_how) {
3954 case SP4_NONE:
3955 break;
3956 case SP4_MACH_CRED:
3957 /* spo_must_enforce bitmap: */
3958 nfserr = nfsd4_encode_bitmap(xdr,
3959 exid->spo_must_enforce[0],
3960 exid->spo_must_enforce[1],
3961 exid->spo_must_enforce[2]);
3962 if (nfserr)
3963 return nfserr;
3964 /* spo_must_allow bitmap: */
3965 nfserr = nfsd4_encode_bitmap(xdr,
3966 exid->spo_must_allow[0],
3967 exid->spo_must_allow[1],
3968 exid->spo_must_allow[2]);
3969 if (nfserr)
3970 return nfserr;
3971 break;
3972 default:
3973 WARN_ON_ONCE(1);
3974 }
3975
3976 p = xdr_reserve_space(xdr,
3977 8 /* so_minor_id */ +
3978 4 /* so_major_id.len */ +
3979 (XDR_QUADLEN(major_id_sz) * 4) +
3980 4 /* eir_server_scope.len */ +
3981 (XDR_QUADLEN(server_scope_sz) * 4) +
3982 4 /* eir_server_impl_id.count (0) */);
3983 if (!p)
3984 return nfserr_resource;
3985
3986 /* The server_owner struct */
3987 p = xdr_encode_hyper(p, minor_id); /* Minor id */
3988 /* major id */
3989 p = xdr_encode_opaque(p, major_id, major_id_sz);
3990
3991 /* Server scope */
3992 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3993
3994 /* Implementation id */
3995 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
3996 return 0;
3997 }
3998
3999 static __be32
4000 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4001 struct nfsd4_create_session *sess)
4002 {
4003 struct xdr_stream *xdr = &resp->xdr;
4004 __be32 *p;
4005
4006 p = xdr_reserve_space(xdr, 24);
4007 if (!p)
4008 return nfserr_resource;
4009 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4010 NFS4_MAX_SESSIONID_LEN);
4011 *p++ = cpu_to_be32(sess->seqid);
4012 *p++ = cpu_to_be32(sess->flags);
4013
4014 p = xdr_reserve_space(xdr, 28);
4015 if (!p)
4016 return nfserr_resource;
4017 *p++ = cpu_to_be32(0); /* headerpadsz */
4018 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4019 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4020 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4021 *p++ = cpu_to_be32(sess->fore_channel.maxops);
4022 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4023 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4024
4025 if (sess->fore_channel.nr_rdma_attrs) {
4026 p = xdr_reserve_space(xdr, 4);
4027 if (!p)
4028 return nfserr_resource;
4029 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4030 }
4031
4032 p = xdr_reserve_space(xdr, 28);
4033 if (!p)
4034 return nfserr_resource;
4035 *p++ = cpu_to_be32(0); /* headerpadsz */
4036 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4037 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4038 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4039 *p++ = cpu_to_be32(sess->back_channel.maxops);
4040 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4041 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4042
4043 if (sess->back_channel.nr_rdma_attrs) {
4044 p = xdr_reserve_space(xdr, 4);
4045 if (!p)
4046 return nfserr_resource;
4047 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4048 }
4049 return 0;
4050 }
4051
4052 static __be32
4053 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4054 struct nfsd4_sequence *seq)
4055 {
4056 struct xdr_stream *xdr = &resp->xdr;
4057 __be32 *p;
4058
4059 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4060 if (!p)
4061 return nfserr_resource;
4062 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4063 NFS4_MAX_SESSIONID_LEN);
4064 *p++ = cpu_to_be32(seq->seqid);
4065 *p++ = cpu_to_be32(seq->slotid);
4066 /* Note slotid's are numbered from zero: */
4067 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4068 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4069 *p++ = cpu_to_be32(seq->status_flags);
4070
4071 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4072 return 0;
4073 }
4074
4075 static __be32
4076 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4077 struct nfsd4_test_stateid *test_stateid)
4078 {
4079 struct xdr_stream *xdr = &resp->xdr;
4080 struct nfsd4_test_stateid_id *stateid, *next;
4081 __be32 *p;
4082
4083 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4084 if (!p)
4085 return nfserr_resource;
4086 *p++ = htonl(test_stateid->ts_num_ids);
4087
4088 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4089 *p++ = stateid->ts_id_status;
4090 }
4091
4092 return 0;
4093 }
4094
4095 #ifdef CONFIG_NFSD_PNFS
4096 static __be32
4097 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4098 struct nfsd4_getdeviceinfo *gdev)
4099 {
4100 struct xdr_stream *xdr = &resp->xdr;
4101 const struct nfsd4_layout_ops *ops;
4102 u32 starting_len = xdr->buf->len, needed_len;
4103 __be32 *p;
4104
4105 p = xdr_reserve_space(xdr, 4);
4106 if (!p)
4107 return nfserr_resource;
4108
4109 *p++ = cpu_to_be32(gdev->gd_layout_type);
4110
4111 /* If maxcount is 0 then just update notifications */
4112 if (gdev->gd_maxcount != 0) {
4113 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4114 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4115 if (nfserr) {
4116 /*
4117 * We don't bother to burden the layout drivers with
4118 * enforcing gd_maxcount, just tell the client to
4119 * come back with a bigger buffer if it's not enough.
4120 */
4121 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4122 goto toosmall;
4123 return nfserr;
4124 }
4125 }
4126
4127 if (gdev->gd_notify_types) {
4128 p = xdr_reserve_space(xdr, 4 + 4);
4129 if (!p)
4130 return nfserr_resource;
4131 *p++ = cpu_to_be32(1); /* bitmap length */
4132 *p++ = cpu_to_be32(gdev->gd_notify_types);
4133 } else {
4134 p = xdr_reserve_space(xdr, 4);
4135 if (!p)
4136 return nfserr_resource;
4137 *p++ = 0;
4138 }
4139
4140 return 0;
4141 toosmall:
4142 dprintk("%s: maxcount too small\n", __func__);
4143 needed_len = xdr->buf->len + 4 /* notifications */;
4144 xdr_truncate_encode(xdr, starting_len);
4145 p = xdr_reserve_space(xdr, 4);
4146 if (!p)
4147 return nfserr_resource;
4148 *p++ = cpu_to_be32(needed_len);
4149 return nfserr_toosmall;
4150 }
4151
4152 static __be32
4153 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4154 struct nfsd4_layoutget *lgp)
4155 {
4156 struct xdr_stream *xdr = &resp->xdr;
4157 const struct nfsd4_layout_ops *ops;
4158 __be32 *p;
4159
4160 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4161 if (!p)
4162 return nfserr_resource;
4163
4164 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4165 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4166 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4167 sizeof(stateid_opaque_t));
4168
4169 *p++ = cpu_to_be32(1); /* we always return a single layout */
4170 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4171 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4172 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4173 *p++ = cpu_to_be32(lgp->lg_layout_type);
4174
4175 ops = nfsd4_layout_ops[lgp->lg_layout_type];
4176 return ops->encode_layoutget(xdr, lgp);
4177 }
4178
4179 static __be32
4180 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4181 struct nfsd4_layoutcommit *lcp)
4182 {
4183 struct xdr_stream *xdr = &resp->xdr;
4184 __be32 *p;
4185
4186 p = xdr_reserve_space(xdr, 4);
4187 if (!p)
4188 return nfserr_resource;
4189 *p++ = cpu_to_be32(lcp->lc_size_chg);
4190 if (lcp->lc_size_chg) {
4191 p = xdr_reserve_space(xdr, 8);
4192 if (!p)
4193 return nfserr_resource;
4194 p = xdr_encode_hyper(p, lcp->lc_newsize);
4195 }
4196
4197 return 0;
4198 }
4199
4200 static __be32
4201 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4202 struct nfsd4_layoutreturn *lrp)
4203 {
4204 struct xdr_stream *xdr = &resp->xdr;
4205 __be32 *p;
4206
4207 p = xdr_reserve_space(xdr, 4);
4208 if (!p)
4209 return nfserr_resource;
4210 *p++ = cpu_to_be32(lrp->lrs_present);
4211 if (lrp->lrs_present)
4212 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4213 return 0;
4214 }
4215 #endif /* CONFIG_NFSD_PNFS */
4216
4217 static __be32
4218 nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
4219 struct nfsd42_write_res *write, bool sync)
4220 {
4221 __be32 *p;
4222 p = xdr_reserve_space(&resp->xdr, 4);
4223 if (!p)
4224 return nfserr_resource;
4225
4226 if (sync)
4227 *p++ = cpu_to_be32(0);
4228 else {
4229 __be32 nfserr;
4230 *p++ = cpu_to_be32(1);
4231 nfserr = nfsd4_encode_stateid(&resp->xdr, &write->cb_stateid);
4232 if (nfserr)
4233 return nfserr;
4234 }
4235 p = xdr_reserve_space(&resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
4236 if (!p)
4237 return nfserr_resource;
4238
4239 p = xdr_encode_hyper(p, write->wr_bytes_written);
4240 *p++ = cpu_to_be32(write->wr_stable_how);
4241 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4242 NFS4_VERIFIER_SIZE);
4243 return nfs_ok;
4244 }
4245
4246 static __be32
4247 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4248 struct nfsd4_copy *copy)
4249 {
4250 __be32 *p;
4251
4252 nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
4253 copy->cp_synchronous);
4254 if (nfserr)
4255 return nfserr;
4256
4257 p = xdr_reserve_space(&resp->xdr, 4 + 4);
4258 *p++ = xdr_one; /* cr_consecutive */
4259 *p++ = cpu_to_be32(copy->cp_synchronous);
4260 return 0;
4261 }
4262
4263 static __be32
4264 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
4265 struct nfsd4_offload_status *os)
4266 {
4267 struct xdr_stream *xdr = &resp->xdr;
4268 __be32 *p;
4269
4270 p = xdr_reserve_space(xdr, 8 + 4);
4271 if (!p)
4272 return nfserr_resource;
4273 p = xdr_encode_hyper(p, os->count);
4274 *p++ = cpu_to_be32(0);
4275
4276 return nfserr;
4277 }
4278
4279 static __be32
4280 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4281 struct nfsd4_seek *seek)
4282 {
4283 __be32 *p;
4284
4285 p = xdr_reserve_space(&resp->xdr, 4 + 8);
4286 *p++ = cpu_to_be32(seek->seek_eof);
4287 p = xdr_encode_hyper(p, seek->seek_pos);
4288
4289 return 0;
4290 }
4291
4292 static __be32
4293 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4294 {
4295 return nfserr;
4296 }
4297
4298 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4299
4300 /*
4301 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4302 * since we don't need to filter out obsolete ops as this is
4303 * done in the decoding phase.
4304 */
4305 static const nfsd4_enc nfsd4_enc_ops[] = {
4306 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
4307 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
4308 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
4309 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
4310 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
4311 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4312 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
4313 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
4314 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
4315 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
4316 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
4317 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
4318 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
4319 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
4320 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4321 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
4322 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
4323 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
4324 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
4325 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
4326 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
4327 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
4328 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
4329 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
4330 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
4331 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
4332 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
4333 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
4334 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
4335 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
4336 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
4337 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
4338 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
4339 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4340 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4341 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
4342 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
4343
4344 /* NFSv4.1 operations */
4345 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
4346 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4347 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
4348 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
4349 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
4350 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
4351 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4352 #ifdef CONFIG_NFSD_PNFS
4353 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4354 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4355 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit,
4356 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget,
4357 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn,
4358 #else
4359 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
4360 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4361 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
4362 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
4363 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4364 #endif
4365 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4366 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
4367 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
4368 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
4369 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4370 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
4371 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
4372
4373 /* NFSv4.2 operations */
4374 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4375 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy,
4376 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
4377 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4378 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
4379 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
4380 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
4381 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
4382 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_offload_status,
4383 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
4384 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
4385 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
4386 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop,
4387 };
4388
4389 /*
4390 * Calculate whether we still have space to encode repsize bytes.
4391 * There are two considerations:
4392 * - For NFS versions >=4.1, the size of the reply must stay within
4393 * session limits
4394 * - For all NFS versions, we must stay within limited preallocated
4395 * buffer space.
4396 *
4397 * This is called before the operation is processed, so can only provide
4398 * an upper estimate. For some nonidempotent operations (such as
4399 * getattr), it's not necessarily a problem if that estimate is wrong,
4400 * as we can fail it after processing without significant side effects.
4401 */
4402 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4403 {
4404 struct xdr_buf *buf = &resp->rqstp->rq_res;
4405 struct nfsd4_slot *slot = resp->cstate.slot;
4406
4407 if (buf->len + respsize <= buf->buflen)
4408 return nfs_ok;
4409 if (!nfsd4_has_session(&resp->cstate))
4410 return nfserr_resource;
4411 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4412 WARN_ON_ONCE(1);
4413 return nfserr_rep_too_big_to_cache;
4414 }
4415 return nfserr_rep_too_big;
4416 }
4417
4418 void
4419 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4420 {
4421 struct xdr_stream *xdr = &resp->xdr;
4422 struct nfs4_stateowner *so = resp->cstate.replay_owner;
4423 struct svc_rqst *rqstp = resp->rqstp;
4424 const struct nfsd4_operation *opdesc = op->opdesc;
4425 int post_err_offset;
4426 nfsd4_enc encoder;
4427 __be32 *p;
4428
4429 p = xdr_reserve_space(xdr, 8);
4430 if (!p) {
4431 WARN_ON_ONCE(1);
4432 return;
4433 }
4434 *p++ = cpu_to_be32(op->opnum);
4435 post_err_offset = xdr->buf->len;
4436
4437 if (op->opnum == OP_ILLEGAL)
4438 goto status;
4439 if (op->status && opdesc &&
4440 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
4441 goto status;
4442 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4443 !nfsd4_enc_ops[op->opnum]);
4444 encoder = nfsd4_enc_ops[op->opnum];
4445 op->status = encoder(resp, op->status, &op->u);
4446 if (opdesc && opdesc->op_release)
4447 opdesc->op_release(&op->u);
4448 xdr_commit_encode(xdr);
4449
4450 /* nfsd4_check_resp_size guarantees enough room for error status */
4451 if (!op->status) {
4452 int space_needed = 0;
4453 if (!nfsd4_last_compound_op(rqstp))
4454 space_needed = COMPOUND_ERR_SLACK_SPACE;
4455 op->status = nfsd4_check_resp_size(resp, space_needed);
4456 }
4457 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4458 struct nfsd4_slot *slot = resp->cstate.slot;
4459
4460 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4461 op->status = nfserr_rep_too_big_to_cache;
4462 else
4463 op->status = nfserr_rep_too_big;
4464 }
4465 if (op->status == nfserr_resource ||
4466 op->status == nfserr_rep_too_big ||
4467 op->status == nfserr_rep_too_big_to_cache) {
4468 /*
4469 * The operation may have already been encoded or
4470 * partially encoded. No op returns anything additional
4471 * in the case of one of these three errors, so we can
4472 * just truncate back to after the status. But it's a
4473 * bug if we had to do this on a non-idempotent op:
4474 */
4475 warn_on_nonidempotent_op(op);
4476 xdr_truncate_encode(xdr, post_err_offset);
4477 }
4478 if (so) {
4479 int len = xdr->buf->len - post_err_offset;
4480
4481 so->so_replay.rp_status = op->status;
4482 so->so_replay.rp_buflen = len;
4483 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4484 so->so_replay.rp_buf, len);
4485 }
4486 status:
4487 /* Note that op->status is already in network byte order: */
4488 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4489 }
4490
4491 /*
4492 * Encode the reply stored in the stateowner reply cache
4493 *
4494 * XDR note: do not encode rp->rp_buflen: the buffer contains the
4495 * previously sent already encoded operation.
4496 */
4497 void
4498 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4499 {
4500 __be32 *p;
4501 struct nfs4_replay *rp = op->replay;
4502
4503 BUG_ON(!rp);
4504
4505 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4506 if (!p) {
4507 WARN_ON_ONCE(1);
4508 return;
4509 }
4510 *p++ = cpu_to_be32(op->opnum);
4511 *p++ = rp->rp_status; /* already xdr'ed */
4512
4513 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4514 }
4515
4516 int
4517 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4518 {
4519 return xdr_ressize_check(rqstp, p);
4520 }
4521
4522 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4523 {
4524 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4525
4526 if (args->ops != args->iops) {
4527 kfree(args->ops);
4528 args->ops = args->iops;
4529 }
4530 kfree(args->tmpp);
4531 args->tmpp = NULL;
4532 while (args->to_free) {
4533 struct svcxdr_tmpbuf *tb = args->to_free;
4534 args->to_free = tb->next;
4535 kfree(tb);
4536 }
4537 }
4538
4539 int
4540 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4541 {
4542 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4543
4544 if (rqstp->rq_arg.head[0].iov_len % 4) {
4545 /* client is nuts */
4546 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4547 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4548 return 0;
4549 }
4550 args->p = p;
4551 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4552 args->pagelist = rqstp->rq_arg.pages;
4553 args->pagelen = rqstp->rq_arg.page_len;
4554 args->tail = false;
4555 args->tmpp = NULL;
4556 args->to_free = NULL;
4557 args->ops = args->iops;
4558 args->rqstp = rqstp;
4559
4560 return !nfsd4_decode_compound(args);
4561 }
4562
4563 int
4564 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4565 {
4566 /*
4567 * All that remains is to write the tag and operation count...
4568 */
4569 struct nfsd4_compoundres *resp = rqstp->rq_resp;
4570 struct xdr_buf *buf = resp->xdr.buf;
4571
4572 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4573 buf->tail[0].iov_len);
4574
4575 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4576
4577 p = resp->tagp;
4578 *p++ = htonl(resp->taglen);
4579 memcpy(p, resp->tag, resp->taglen);
4580 p += XDR_QUADLEN(resp->taglen);
4581 *p++ = htonl(resp->opcnt);
4582
4583 nfsd4_sequence_done(resp);
4584 return 1;
4585 }
4586
4587 /*
4588 * Local variables:
4589 * c-basic-offset: 8
4590 * End:
4591 */
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