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UBUNTU: [Config] arm64: snapdragon: DRM_MSM=m
[mirror_ubuntu-bionic-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
53 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
54 #include <linux/security.h>
55 #endif
56
57
58 #define NFSDDBG_FACILITY NFSDDBG_XDR
59
60 const u32 nfsd_suppattrs[3][3] = {
61 {NFSD4_SUPPORTED_ATTRS_WORD0,
62 NFSD4_SUPPORTED_ATTRS_WORD1,
63 NFSD4_SUPPORTED_ATTRS_WORD2},
64
65 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
66 NFSD4_1_SUPPORTED_ATTRS_WORD1,
67 NFSD4_1_SUPPORTED_ATTRS_WORD2},
68
69 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
70 NFSD4_1_SUPPORTED_ATTRS_WORD1,
71 NFSD4_2_SUPPORTED_ATTRS_WORD2},
72 };
73
74 /*
75 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
76 * directory in order to indicate to the client that a filesystem boundary is present
77 * We use a fixed fsid for a referral
78 */
79 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
80 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
81
82 static __be32
83 check_filename(char *str, int len)
84 {
85 int i;
86
87 if (len == 0)
88 return nfserr_inval;
89 if (isdotent(str, len))
90 return nfserr_badname;
91 for (i = 0; i < len; i++)
92 if (str[i] == '/')
93 return nfserr_badname;
94 return 0;
95 }
96
97 #define DECODE_HEAD \
98 __be32 *p; \
99 __be32 status
100 #define DECODE_TAIL \
101 status = 0; \
102 out: \
103 return status; \
104 xdr_error: \
105 dprintk("NFSD: xdr error (%s:%d)\n", \
106 __FILE__, __LINE__); \
107 status = nfserr_bad_xdr; \
108 goto out
109
110 #define READMEM(x,nbytes) do { \
111 x = (char *)p; \
112 p += XDR_QUADLEN(nbytes); \
113 } while (0)
114 #define SAVEMEM(x,nbytes) do { \
115 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
116 savemem(argp, p, nbytes) : \
117 (char *)p)) { \
118 dprintk("NFSD: xdr error (%s:%d)\n", \
119 __FILE__, __LINE__); \
120 goto xdr_error; \
121 } \
122 p += XDR_QUADLEN(nbytes); \
123 } while (0)
124 #define COPYMEM(x,nbytes) do { \
125 memcpy((x), p, nbytes); \
126 p += XDR_QUADLEN(nbytes); \
127 } while (0)
128
129 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
130 #define READ_BUF(nbytes) do { \
131 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
132 p = argp->p; \
133 argp->p += XDR_QUADLEN(nbytes); \
134 } else if (!(p = read_buf(argp, nbytes))) { \
135 dprintk("NFSD: xdr error (%s:%d)\n", \
136 __FILE__, __LINE__); \
137 goto xdr_error; \
138 } \
139 } while (0)
140
141 static void next_decode_page(struct nfsd4_compoundargs *argp)
142 {
143 argp->p = page_address(argp->pagelist[0]);
144 argp->pagelist++;
145 if (argp->pagelen < PAGE_SIZE) {
146 argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
147 argp->pagelen = 0;
148 } else {
149 argp->end = argp->p + (PAGE_SIZE>>2);
150 argp->pagelen -= PAGE_SIZE;
151 }
152 }
153
154 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
155 {
156 /* We want more bytes than seem to be available.
157 * Maybe we need a new page, maybe we have just run out
158 */
159 unsigned int avail = (char *)argp->end - (char *)argp->p;
160 __be32 *p;
161
162 if (argp->pagelen == 0) {
163 struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
164
165 if (!argp->tail) {
166 argp->tail = true;
167 avail = vec->iov_len;
168 argp->p = vec->iov_base;
169 argp->end = vec->iov_base + avail;
170 }
171
172 if (avail < nbytes)
173 return NULL;
174
175 p = argp->p;
176 argp->p += XDR_QUADLEN(nbytes);
177 return p;
178 }
179
180 if (avail + argp->pagelen < nbytes)
181 return NULL;
182 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
183 return NULL;
184 /* ok, we can do it with the current plus the next page */
185 if (nbytes <= sizeof(argp->tmp))
186 p = argp->tmp;
187 else {
188 kfree(argp->tmpp);
189 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
190 if (!p)
191 return NULL;
192
193 }
194 /*
195 * The following memcpy is safe because read_buf is always
196 * called with nbytes > avail, and the two cases above both
197 * guarantee p points to at least nbytes bytes.
198 */
199 memcpy(p, argp->p, avail);
200 next_decode_page(argp);
201 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
202 argp->p += XDR_QUADLEN(nbytes - avail);
203 return p;
204 }
205
206 static int zero_clientid(clientid_t *clid)
207 {
208 return (clid->cl_boot == 0) && (clid->cl_id == 0);
209 }
210
211 /**
212 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
213 * @argp: NFSv4 compound argument structure
214 * @p: pointer to be freed (with kfree())
215 *
216 * Marks @p to be freed when processing the compound operation
217 * described in @argp finishes.
218 */
219 static void *
220 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
221 {
222 struct svcxdr_tmpbuf *tb;
223
224 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
225 if (!tb)
226 return NULL;
227 tb->next = argp->to_free;
228 argp->to_free = tb;
229 return tb->buf;
230 }
231
232 /*
233 * For xdr strings that need to be passed to other kernel api's
234 * as null-terminated strings.
235 *
236 * Note null-terminating in place usually isn't safe since the
237 * buffer might end on a page boundary.
238 */
239 static char *
240 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
241 {
242 char *p = svcxdr_tmpalloc(argp, len + 1);
243
244 if (!p)
245 return NULL;
246 memcpy(p, buf, len);
247 p[len] = '\0';
248 return p;
249 }
250
251 /**
252 * savemem - duplicate a chunk of memory for later processing
253 * @argp: NFSv4 compound argument structure to be freed with
254 * @p: pointer to be duplicated
255 * @nbytes: length to be duplicated
256 *
257 * Returns a pointer to a copy of @nbytes bytes of memory at @p
258 * that are preserved until processing of the NFSv4 compound
259 * operation described by @argp finishes.
260 */
261 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
262 {
263 void *ret;
264
265 ret = svcxdr_tmpalloc(argp, nbytes);
266 if (!ret)
267 return NULL;
268 memcpy(ret, p, nbytes);
269 return ret;
270 }
271
272 /*
273 * We require the high 32 bits of 'seconds' to be 0, and
274 * we ignore all 32 bits of 'nseconds'.
275 */
276 static __be32
277 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
278 {
279 DECODE_HEAD;
280 u64 sec;
281
282 READ_BUF(12);
283 p = xdr_decode_hyper(p, &sec);
284 tv->tv_sec = sec;
285 tv->tv_nsec = be32_to_cpup(p++);
286 if (tv->tv_nsec >= (u32)1000000000)
287 return nfserr_inval;
288
289 DECODE_TAIL;
290 }
291
292 static __be32
293 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
294 {
295 u32 bmlen;
296 DECODE_HEAD;
297
298 bmval[0] = 0;
299 bmval[1] = 0;
300 bmval[2] = 0;
301
302 READ_BUF(4);
303 bmlen = be32_to_cpup(p++);
304 if (bmlen > 1000)
305 goto xdr_error;
306
307 READ_BUF(bmlen << 2);
308 if (bmlen > 0)
309 bmval[0] = be32_to_cpup(p++);
310 if (bmlen > 1)
311 bmval[1] = be32_to_cpup(p++);
312 if (bmlen > 2)
313 bmval[2] = be32_to_cpup(p++);
314
315 DECODE_TAIL;
316 }
317
318 static __be32
319 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
320 struct iattr *iattr, struct nfs4_acl **acl,
321 struct xdr_netobj *label, int *umask)
322 {
323 int expected_len, len = 0;
324 u32 dummy32;
325 char *buf;
326
327 DECODE_HEAD;
328 iattr->ia_valid = 0;
329 if ((status = nfsd4_decode_bitmap(argp, bmval)))
330 return status;
331
332 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
333 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
334 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
335 if (nfsd_attrs_supported(argp->minorversion, bmval))
336 return nfserr_inval;
337 return nfserr_attrnotsupp;
338 }
339
340 READ_BUF(4);
341 expected_len = be32_to_cpup(p++);
342
343 if (bmval[0] & FATTR4_WORD0_SIZE) {
344 READ_BUF(8);
345 len += 8;
346 p = xdr_decode_hyper(p, &iattr->ia_size);
347 iattr->ia_valid |= ATTR_SIZE;
348 }
349 if (bmval[0] & FATTR4_WORD0_ACL) {
350 u32 nace;
351 struct nfs4_ace *ace;
352
353 READ_BUF(4); len += 4;
354 nace = be32_to_cpup(p++);
355
356 if (nace > NFS4_ACL_MAX)
357 return nfserr_fbig;
358
359 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
360 if (*acl == NULL)
361 return nfserr_jukebox;
362
363 (*acl)->naces = nace;
364 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
365 READ_BUF(16); len += 16;
366 ace->type = be32_to_cpup(p++);
367 ace->flag = be32_to_cpup(p++);
368 ace->access_mask = be32_to_cpup(p++);
369 dummy32 = be32_to_cpup(p++);
370 READ_BUF(dummy32);
371 len += XDR_QUADLEN(dummy32) << 2;
372 READMEM(buf, dummy32);
373 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
374 status = nfs_ok;
375 if (ace->whotype != NFS4_ACL_WHO_NAMED)
376 ;
377 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
378 status = nfsd_map_name_to_gid(argp->rqstp,
379 buf, dummy32, &ace->who_gid);
380 else
381 status = nfsd_map_name_to_uid(argp->rqstp,
382 buf, dummy32, &ace->who_uid);
383 if (status)
384 return status;
385 }
386 } else
387 *acl = NULL;
388 if (bmval[1] & FATTR4_WORD1_MODE) {
389 READ_BUF(4);
390 len += 4;
391 iattr->ia_mode = be32_to_cpup(p++);
392 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
393 iattr->ia_valid |= ATTR_MODE;
394 }
395 if (bmval[1] & FATTR4_WORD1_OWNER) {
396 READ_BUF(4);
397 len += 4;
398 dummy32 = be32_to_cpup(p++);
399 READ_BUF(dummy32);
400 len += (XDR_QUADLEN(dummy32) << 2);
401 READMEM(buf, dummy32);
402 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
403 return status;
404 iattr->ia_valid |= ATTR_UID;
405 }
406 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
407 READ_BUF(4);
408 len += 4;
409 dummy32 = be32_to_cpup(p++);
410 READ_BUF(dummy32);
411 len += (XDR_QUADLEN(dummy32) << 2);
412 READMEM(buf, dummy32);
413 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
414 return status;
415 iattr->ia_valid |= ATTR_GID;
416 }
417 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
418 READ_BUF(4);
419 len += 4;
420 dummy32 = be32_to_cpup(p++);
421 switch (dummy32) {
422 case NFS4_SET_TO_CLIENT_TIME:
423 len += 12;
424 status = nfsd4_decode_time(argp, &iattr->ia_atime);
425 if (status)
426 return status;
427 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
428 break;
429 case NFS4_SET_TO_SERVER_TIME:
430 iattr->ia_valid |= ATTR_ATIME;
431 break;
432 default:
433 goto xdr_error;
434 }
435 }
436 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
437 READ_BUF(4);
438 len += 4;
439 dummy32 = be32_to_cpup(p++);
440 switch (dummy32) {
441 case NFS4_SET_TO_CLIENT_TIME:
442 len += 12;
443 status = nfsd4_decode_time(argp, &iattr->ia_mtime);
444 if (status)
445 return status;
446 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
447 break;
448 case NFS4_SET_TO_SERVER_TIME:
449 iattr->ia_valid |= ATTR_MTIME;
450 break;
451 default:
452 goto xdr_error;
453 }
454 }
455
456 label->len = 0;
457 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
458 if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
459 READ_BUF(4);
460 len += 4;
461 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
462 READ_BUF(4);
463 len += 4;
464 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
465 READ_BUF(4);
466 len += 4;
467 dummy32 = be32_to_cpup(p++);
468 READ_BUF(dummy32);
469 if (dummy32 > NFS4_MAXLABELLEN)
470 return nfserr_badlabel;
471 len += (XDR_QUADLEN(dummy32) << 2);
472 READMEM(buf, dummy32);
473 label->len = dummy32;
474 label->data = svcxdr_dupstr(argp, buf, dummy32);
475 if (!label->data)
476 return nfserr_jukebox;
477 }
478 #endif
479 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
480 if (!umask)
481 goto xdr_error;
482 READ_BUF(8);
483 len += 8;
484 dummy32 = be32_to_cpup(p++);
485 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
486 dummy32 = be32_to_cpup(p++);
487 *umask = dummy32 & S_IRWXUGO;
488 iattr->ia_valid |= ATTR_MODE;
489 }
490 if (len != expected_len)
491 goto xdr_error;
492
493 DECODE_TAIL;
494 }
495
496 static __be32
497 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
498 {
499 DECODE_HEAD;
500
501 READ_BUF(sizeof(stateid_t));
502 sid->si_generation = be32_to_cpup(p++);
503 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
504
505 DECODE_TAIL;
506 }
507
508 static __be32
509 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
510 {
511 DECODE_HEAD;
512
513 READ_BUF(4);
514 access->ac_req_access = be32_to_cpup(p++);
515
516 DECODE_TAIL;
517 }
518
519 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
520 {
521 DECODE_HEAD;
522 u32 dummy, uid, gid;
523 char *machine_name;
524 int i;
525 int nr_secflavs;
526
527 /* callback_sec_params4 */
528 READ_BUF(4);
529 nr_secflavs = be32_to_cpup(p++);
530 if (nr_secflavs)
531 cbs->flavor = (u32)(-1);
532 else
533 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
534 cbs->flavor = 0;
535 for (i = 0; i < nr_secflavs; ++i) {
536 READ_BUF(4);
537 dummy = be32_to_cpup(p++);
538 switch (dummy) {
539 case RPC_AUTH_NULL:
540 /* Nothing to read */
541 if (cbs->flavor == (u32)(-1))
542 cbs->flavor = RPC_AUTH_NULL;
543 break;
544 case RPC_AUTH_UNIX:
545 READ_BUF(8);
546 /* stamp */
547 dummy = be32_to_cpup(p++);
548
549 /* machine name */
550 dummy = be32_to_cpup(p++);
551 READ_BUF(dummy);
552 SAVEMEM(machine_name, dummy);
553
554 /* uid, gid */
555 READ_BUF(8);
556 uid = be32_to_cpup(p++);
557 gid = be32_to_cpup(p++);
558
559 /* more gids */
560 READ_BUF(4);
561 dummy = be32_to_cpup(p++);
562 READ_BUF(dummy * 4);
563 if (cbs->flavor == (u32)(-1)) {
564 kuid_t kuid = make_kuid(&init_user_ns, uid);
565 kgid_t kgid = make_kgid(&init_user_ns, gid);
566 if (uid_valid(kuid) && gid_valid(kgid)) {
567 cbs->uid = kuid;
568 cbs->gid = kgid;
569 cbs->flavor = RPC_AUTH_UNIX;
570 } else {
571 dprintk("RPC_AUTH_UNIX with invalid"
572 "uid or gid ignoring!\n");
573 }
574 }
575 break;
576 case RPC_AUTH_GSS:
577 dprintk("RPC_AUTH_GSS callback secflavor "
578 "not supported!\n");
579 READ_BUF(8);
580 /* gcbp_service */
581 dummy = be32_to_cpup(p++);
582 /* gcbp_handle_from_server */
583 dummy = be32_to_cpup(p++);
584 READ_BUF(dummy);
585 p += XDR_QUADLEN(dummy);
586 /* gcbp_handle_from_client */
587 READ_BUF(4);
588 dummy = be32_to_cpup(p++);
589 READ_BUF(dummy);
590 break;
591 default:
592 dprintk("Illegal callback secflavor\n");
593 return nfserr_inval;
594 }
595 }
596 DECODE_TAIL;
597 }
598
599 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
600 {
601 DECODE_HEAD;
602
603 READ_BUF(4);
604 bc->bc_cb_program = be32_to_cpup(p++);
605 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
606
607 DECODE_TAIL;
608 }
609
610 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
611 {
612 DECODE_HEAD;
613
614 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
615 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
616 bcts->dir = be32_to_cpup(p++);
617 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
618 * could help us figure out we should be using it. */
619 DECODE_TAIL;
620 }
621
622 static __be32
623 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
624 {
625 DECODE_HEAD;
626
627 READ_BUF(4);
628 close->cl_seqid = be32_to_cpup(p++);
629 return nfsd4_decode_stateid(argp, &close->cl_stateid);
630
631 DECODE_TAIL;
632 }
633
634
635 static __be32
636 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
637 {
638 DECODE_HEAD;
639
640 READ_BUF(12);
641 p = xdr_decode_hyper(p, &commit->co_offset);
642 commit->co_count = be32_to_cpup(p++);
643
644 DECODE_TAIL;
645 }
646
647 static __be32
648 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
649 {
650 DECODE_HEAD;
651
652 READ_BUF(4);
653 create->cr_type = be32_to_cpup(p++);
654 switch (create->cr_type) {
655 case NF4LNK:
656 READ_BUF(4);
657 create->cr_datalen = be32_to_cpup(p++);
658 READ_BUF(create->cr_datalen);
659 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
660 if (!create->cr_data)
661 return nfserr_jukebox;
662 break;
663 case NF4BLK:
664 case NF4CHR:
665 READ_BUF(8);
666 create->cr_specdata1 = be32_to_cpup(p++);
667 create->cr_specdata2 = be32_to_cpup(p++);
668 break;
669 case NF4SOCK:
670 case NF4FIFO:
671 case NF4DIR:
672 default:
673 break;
674 }
675
676 READ_BUF(4);
677 create->cr_namelen = be32_to_cpup(p++);
678 READ_BUF(create->cr_namelen);
679 SAVEMEM(create->cr_name, create->cr_namelen);
680 if ((status = check_filename(create->cr_name, create->cr_namelen)))
681 return status;
682
683 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
684 &create->cr_acl, &create->cr_label,
685 &create->cr_umask);
686 if (status)
687 goto out;
688
689 DECODE_TAIL;
690 }
691
692 static inline __be32
693 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
694 {
695 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
696 }
697
698 static inline __be32
699 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
700 {
701 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
702 }
703
704 static __be32
705 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
706 {
707 DECODE_HEAD;
708
709 READ_BUF(4);
710 link->li_namelen = be32_to_cpup(p++);
711 READ_BUF(link->li_namelen);
712 SAVEMEM(link->li_name, link->li_namelen);
713 if ((status = check_filename(link->li_name, link->li_namelen)))
714 return status;
715
716 DECODE_TAIL;
717 }
718
719 static __be32
720 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
721 {
722 DECODE_HEAD;
723
724 /*
725 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
726 */
727 READ_BUF(28);
728 lock->lk_type = be32_to_cpup(p++);
729 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
730 goto xdr_error;
731 lock->lk_reclaim = be32_to_cpup(p++);
732 p = xdr_decode_hyper(p, &lock->lk_offset);
733 p = xdr_decode_hyper(p, &lock->lk_length);
734 lock->lk_is_new = be32_to_cpup(p++);
735
736 if (lock->lk_is_new) {
737 READ_BUF(4);
738 lock->lk_new_open_seqid = be32_to_cpup(p++);
739 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
740 if (status)
741 return status;
742 READ_BUF(8 + sizeof(clientid_t));
743 lock->lk_new_lock_seqid = be32_to_cpup(p++);
744 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
745 lock->lk_new_owner.len = be32_to_cpup(p++);
746 READ_BUF(lock->lk_new_owner.len);
747 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
748 } else {
749 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
750 if (status)
751 return status;
752 READ_BUF(4);
753 lock->lk_old_lock_seqid = be32_to_cpup(p++);
754 }
755
756 DECODE_TAIL;
757 }
758
759 static __be32
760 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
761 {
762 DECODE_HEAD;
763
764 READ_BUF(32);
765 lockt->lt_type = be32_to_cpup(p++);
766 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
767 goto xdr_error;
768 p = xdr_decode_hyper(p, &lockt->lt_offset);
769 p = xdr_decode_hyper(p, &lockt->lt_length);
770 COPYMEM(&lockt->lt_clientid, 8);
771 lockt->lt_owner.len = be32_to_cpup(p++);
772 READ_BUF(lockt->lt_owner.len);
773 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
774
775 DECODE_TAIL;
776 }
777
778 static __be32
779 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
780 {
781 DECODE_HEAD;
782
783 READ_BUF(8);
784 locku->lu_type = be32_to_cpup(p++);
785 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
786 goto xdr_error;
787 locku->lu_seqid = be32_to_cpup(p++);
788 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
789 if (status)
790 return status;
791 READ_BUF(16);
792 p = xdr_decode_hyper(p, &locku->lu_offset);
793 p = xdr_decode_hyper(p, &locku->lu_length);
794
795 DECODE_TAIL;
796 }
797
798 static __be32
799 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
800 {
801 DECODE_HEAD;
802
803 READ_BUF(4);
804 lookup->lo_len = be32_to_cpup(p++);
805 READ_BUF(lookup->lo_len);
806 SAVEMEM(lookup->lo_name, lookup->lo_len);
807 if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
808 return status;
809
810 DECODE_TAIL;
811 }
812
813 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
814 {
815 __be32 *p;
816 u32 w;
817
818 READ_BUF(4);
819 w = be32_to_cpup(p++);
820 *share_access = w & NFS4_SHARE_ACCESS_MASK;
821 *deleg_want = w & NFS4_SHARE_WANT_MASK;
822 if (deleg_when)
823 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
824
825 switch (w & NFS4_SHARE_ACCESS_MASK) {
826 case NFS4_SHARE_ACCESS_READ:
827 case NFS4_SHARE_ACCESS_WRITE:
828 case NFS4_SHARE_ACCESS_BOTH:
829 break;
830 default:
831 return nfserr_bad_xdr;
832 }
833 w &= ~NFS4_SHARE_ACCESS_MASK;
834 if (!w)
835 return nfs_ok;
836 if (!argp->minorversion)
837 return nfserr_bad_xdr;
838 switch (w & NFS4_SHARE_WANT_MASK) {
839 case NFS4_SHARE_WANT_NO_PREFERENCE:
840 case NFS4_SHARE_WANT_READ_DELEG:
841 case NFS4_SHARE_WANT_WRITE_DELEG:
842 case NFS4_SHARE_WANT_ANY_DELEG:
843 case NFS4_SHARE_WANT_NO_DELEG:
844 case NFS4_SHARE_WANT_CANCEL:
845 break;
846 default:
847 return nfserr_bad_xdr;
848 }
849 w &= ~NFS4_SHARE_WANT_MASK;
850 if (!w)
851 return nfs_ok;
852
853 if (!deleg_when) /* open_downgrade */
854 return nfserr_inval;
855 switch (w) {
856 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
857 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
858 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
859 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
860 return nfs_ok;
861 }
862 xdr_error:
863 return nfserr_bad_xdr;
864 }
865
866 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
867 {
868 __be32 *p;
869
870 READ_BUF(4);
871 *x = be32_to_cpup(p++);
872 /* Note: unlinke access bits, deny bits may be zero. */
873 if (*x & ~NFS4_SHARE_DENY_BOTH)
874 return nfserr_bad_xdr;
875 return nfs_ok;
876 xdr_error:
877 return nfserr_bad_xdr;
878 }
879
880 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
881 {
882 __be32 *p;
883
884 READ_BUF(4);
885 o->len = be32_to_cpup(p++);
886
887 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
888 return nfserr_bad_xdr;
889
890 READ_BUF(o->len);
891 SAVEMEM(o->data, o->len);
892 return nfs_ok;
893 xdr_error:
894 return nfserr_bad_xdr;
895 }
896
897 static __be32
898 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
899 {
900 DECODE_HEAD;
901 u32 dummy;
902
903 memset(open->op_bmval, 0, sizeof(open->op_bmval));
904 open->op_iattr.ia_valid = 0;
905 open->op_openowner = NULL;
906
907 open->op_xdr_error = 0;
908 /* seqid, share_access, share_deny, clientid, ownerlen */
909 READ_BUF(4);
910 open->op_seqid = be32_to_cpup(p++);
911 /* decode, yet ignore deleg_when until supported */
912 status = nfsd4_decode_share_access(argp, &open->op_share_access,
913 &open->op_deleg_want, &dummy);
914 if (status)
915 goto xdr_error;
916 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
917 if (status)
918 goto xdr_error;
919 READ_BUF(sizeof(clientid_t));
920 COPYMEM(&open->op_clientid, sizeof(clientid_t));
921 status = nfsd4_decode_opaque(argp, &open->op_owner);
922 if (status)
923 goto xdr_error;
924 READ_BUF(4);
925 open->op_create = be32_to_cpup(p++);
926 switch (open->op_create) {
927 case NFS4_OPEN_NOCREATE:
928 break;
929 case NFS4_OPEN_CREATE:
930 READ_BUF(4);
931 open->op_createmode = be32_to_cpup(p++);
932 switch (open->op_createmode) {
933 case NFS4_CREATE_UNCHECKED:
934 case NFS4_CREATE_GUARDED:
935 status = nfsd4_decode_fattr(argp, open->op_bmval,
936 &open->op_iattr, &open->op_acl, &open->op_label,
937 &open->op_umask);
938 if (status)
939 goto out;
940 break;
941 case NFS4_CREATE_EXCLUSIVE:
942 READ_BUF(NFS4_VERIFIER_SIZE);
943 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
944 break;
945 case NFS4_CREATE_EXCLUSIVE4_1:
946 if (argp->minorversion < 1)
947 goto xdr_error;
948 READ_BUF(NFS4_VERIFIER_SIZE);
949 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
950 status = nfsd4_decode_fattr(argp, open->op_bmval,
951 &open->op_iattr, &open->op_acl, &open->op_label,
952 &open->op_umask);
953 if (status)
954 goto out;
955 break;
956 default:
957 goto xdr_error;
958 }
959 break;
960 default:
961 goto xdr_error;
962 }
963
964 /* open_claim */
965 READ_BUF(4);
966 open->op_claim_type = be32_to_cpup(p++);
967 switch (open->op_claim_type) {
968 case NFS4_OPEN_CLAIM_NULL:
969 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
970 READ_BUF(4);
971 open->op_fname.len = be32_to_cpup(p++);
972 READ_BUF(open->op_fname.len);
973 SAVEMEM(open->op_fname.data, open->op_fname.len);
974 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
975 return status;
976 break;
977 case NFS4_OPEN_CLAIM_PREVIOUS:
978 READ_BUF(4);
979 open->op_delegate_type = be32_to_cpup(p++);
980 break;
981 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
982 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
983 if (status)
984 return status;
985 READ_BUF(4);
986 open->op_fname.len = be32_to_cpup(p++);
987 READ_BUF(open->op_fname.len);
988 SAVEMEM(open->op_fname.data, open->op_fname.len);
989 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
990 return status;
991 break;
992 case NFS4_OPEN_CLAIM_FH:
993 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
994 if (argp->minorversion < 1)
995 goto xdr_error;
996 /* void */
997 break;
998 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
999 if (argp->minorversion < 1)
1000 goto xdr_error;
1001 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1002 if (status)
1003 return status;
1004 break;
1005 default:
1006 goto xdr_error;
1007 }
1008
1009 DECODE_TAIL;
1010 }
1011
1012 static __be32
1013 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1014 {
1015 DECODE_HEAD;
1016
1017 if (argp->minorversion >= 1)
1018 return nfserr_notsupp;
1019
1020 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1021 if (status)
1022 return status;
1023 READ_BUF(4);
1024 open_conf->oc_seqid = be32_to_cpup(p++);
1025
1026 DECODE_TAIL;
1027 }
1028
1029 static __be32
1030 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1031 {
1032 DECODE_HEAD;
1033
1034 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1035 if (status)
1036 return status;
1037 READ_BUF(4);
1038 open_down->od_seqid = be32_to_cpup(p++);
1039 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1040 &open_down->od_deleg_want, NULL);
1041 if (status)
1042 return status;
1043 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1044 if (status)
1045 return status;
1046 DECODE_TAIL;
1047 }
1048
1049 static __be32
1050 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1051 {
1052 DECODE_HEAD;
1053
1054 READ_BUF(4);
1055 putfh->pf_fhlen = be32_to_cpup(p++);
1056 if (putfh->pf_fhlen > NFS4_FHSIZE)
1057 goto xdr_error;
1058 READ_BUF(putfh->pf_fhlen);
1059 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1060
1061 DECODE_TAIL;
1062 }
1063
1064 static __be32
1065 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1066 {
1067 if (argp->minorversion == 0)
1068 return nfs_ok;
1069 return nfserr_notsupp;
1070 }
1071
1072 static __be32
1073 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1074 {
1075 DECODE_HEAD;
1076
1077 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1078 if (status)
1079 return status;
1080 READ_BUF(12);
1081 p = xdr_decode_hyper(p, &read->rd_offset);
1082 read->rd_length = be32_to_cpup(p++);
1083
1084 DECODE_TAIL;
1085 }
1086
1087 static __be32
1088 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1089 {
1090 DECODE_HEAD;
1091
1092 READ_BUF(24);
1093 p = xdr_decode_hyper(p, &readdir->rd_cookie);
1094 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1095 readdir->rd_dircount = be32_to_cpup(p++);
1096 readdir->rd_maxcount = be32_to_cpup(p++);
1097 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1098 goto out;
1099
1100 DECODE_TAIL;
1101 }
1102
1103 static __be32
1104 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1105 {
1106 DECODE_HEAD;
1107
1108 READ_BUF(4);
1109 remove->rm_namelen = be32_to_cpup(p++);
1110 READ_BUF(remove->rm_namelen);
1111 SAVEMEM(remove->rm_name, remove->rm_namelen);
1112 if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1113 return status;
1114
1115 DECODE_TAIL;
1116 }
1117
1118 static __be32
1119 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1120 {
1121 DECODE_HEAD;
1122
1123 READ_BUF(4);
1124 rename->rn_snamelen = be32_to_cpup(p++);
1125 READ_BUF(rename->rn_snamelen);
1126 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1127 READ_BUF(4);
1128 rename->rn_tnamelen = be32_to_cpup(p++);
1129 READ_BUF(rename->rn_tnamelen);
1130 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1131 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1132 return status;
1133 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1134 return status;
1135
1136 DECODE_TAIL;
1137 }
1138
1139 static __be32
1140 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1141 {
1142 DECODE_HEAD;
1143
1144 if (argp->minorversion >= 1)
1145 return nfserr_notsupp;
1146
1147 READ_BUF(sizeof(clientid_t));
1148 COPYMEM(clientid, sizeof(clientid_t));
1149
1150 DECODE_TAIL;
1151 }
1152
1153 static __be32
1154 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1155 struct nfsd4_secinfo *secinfo)
1156 {
1157 DECODE_HEAD;
1158
1159 READ_BUF(4);
1160 secinfo->si_namelen = be32_to_cpup(p++);
1161 READ_BUF(secinfo->si_namelen);
1162 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1163 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1164 if (status)
1165 return status;
1166 DECODE_TAIL;
1167 }
1168
1169 static __be32
1170 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1171 struct nfsd4_secinfo_no_name *sin)
1172 {
1173 DECODE_HEAD;
1174
1175 READ_BUF(4);
1176 sin->sin_style = be32_to_cpup(p++);
1177 DECODE_TAIL;
1178 }
1179
1180 static __be32
1181 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1182 {
1183 __be32 status;
1184
1185 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1186 if (status)
1187 return status;
1188 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1189 &setattr->sa_acl, &setattr->sa_label, NULL);
1190 }
1191
1192 static __be32
1193 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1194 {
1195 DECODE_HEAD;
1196
1197 if (argp->minorversion >= 1)
1198 return nfserr_notsupp;
1199
1200 READ_BUF(NFS4_VERIFIER_SIZE);
1201 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1202
1203 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1204 if (status)
1205 return nfserr_bad_xdr;
1206 READ_BUF(8);
1207 setclientid->se_callback_prog = be32_to_cpup(p++);
1208 setclientid->se_callback_netid_len = be32_to_cpup(p++);
1209 READ_BUF(setclientid->se_callback_netid_len);
1210 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1211 READ_BUF(4);
1212 setclientid->se_callback_addr_len = be32_to_cpup(p++);
1213
1214 READ_BUF(setclientid->se_callback_addr_len);
1215 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1216 READ_BUF(4);
1217 setclientid->se_callback_ident = be32_to_cpup(p++);
1218
1219 DECODE_TAIL;
1220 }
1221
1222 static __be32
1223 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1224 {
1225 DECODE_HEAD;
1226
1227 if (argp->minorversion >= 1)
1228 return nfserr_notsupp;
1229
1230 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1231 COPYMEM(&scd_c->sc_clientid, 8);
1232 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1233
1234 DECODE_TAIL;
1235 }
1236
1237 /* Also used for NVERIFY */
1238 static __be32
1239 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1240 {
1241 DECODE_HEAD;
1242
1243 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1244 goto out;
1245
1246 /* For convenience's sake, we compare raw xdr'd attributes in
1247 * nfsd4_proc_verify */
1248
1249 READ_BUF(4);
1250 verify->ve_attrlen = be32_to_cpup(p++);
1251 READ_BUF(verify->ve_attrlen);
1252 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1253
1254 DECODE_TAIL;
1255 }
1256
1257 static __be32
1258 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1259 {
1260 int avail;
1261 int len;
1262 DECODE_HEAD;
1263
1264 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1265 if (status)
1266 return status;
1267 READ_BUF(16);
1268 p = xdr_decode_hyper(p, &write->wr_offset);
1269 write->wr_stable_how = be32_to_cpup(p++);
1270 if (write->wr_stable_how > NFS_FILE_SYNC)
1271 goto xdr_error;
1272 write->wr_buflen = be32_to_cpup(p++);
1273
1274 /* Sorry .. no magic macros for this.. *
1275 * READ_BUF(write->wr_buflen);
1276 * SAVEMEM(write->wr_buf, write->wr_buflen);
1277 */
1278 avail = (char*)argp->end - (char*)argp->p;
1279 if (avail + argp->pagelen < write->wr_buflen) {
1280 dprintk("NFSD: xdr error (%s:%d)\n",
1281 __FILE__, __LINE__);
1282 goto xdr_error;
1283 }
1284 write->wr_head.iov_base = p;
1285 write->wr_head.iov_len = avail;
1286 write->wr_pagelist = argp->pagelist;
1287
1288 len = XDR_QUADLEN(write->wr_buflen) << 2;
1289 if (len >= avail) {
1290 int pages;
1291
1292 len -= avail;
1293
1294 pages = len >> PAGE_SHIFT;
1295 argp->pagelist += pages;
1296 argp->pagelen -= pages * PAGE_SIZE;
1297 len -= pages * PAGE_SIZE;
1298
1299 next_decode_page(argp);
1300 }
1301 argp->p += XDR_QUADLEN(len);
1302
1303 DECODE_TAIL;
1304 }
1305
1306 static __be32
1307 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1308 {
1309 DECODE_HEAD;
1310
1311 if (argp->minorversion >= 1)
1312 return nfserr_notsupp;
1313
1314 READ_BUF(12);
1315 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1316 rlockowner->rl_owner.len = be32_to_cpup(p++);
1317 READ_BUF(rlockowner->rl_owner.len);
1318 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1319
1320 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1321 return nfserr_inval;
1322 DECODE_TAIL;
1323 }
1324
1325 static __be32
1326 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1327 struct nfsd4_exchange_id *exid)
1328 {
1329 int dummy, tmp;
1330 DECODE_HEAD;
1331
1332 READ_BUF(NFS4_VERIFIER_SIZE);
1333 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1334
1335 status = nfsd4_decode_opaque(argp, &exid->clname);
1336 if (status)
1337 return nfserr_bad_xdr;
1338
1339 READ_BUF(4);
1340 exid->flags = be32_to_cpup(p++);
1341
1342 /* Ignore state_protect4_a */
1343 READ_BUF(4);
1344 exid->spa_how = be32_to_cpup(p++);
1345 switch (exid->spa_how) {
1346 case SP4_NONE:
1347 break;
1348 case SP4_MACH_CRED:
1349 /* spo_must_enforce */
1350 status = nfsd4_decode_bitmap(argp,
1351 exid->spo_must_enforce);
1352 if (status)
1353 goto out;
1354 /* spo_must_allow */
1355 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1356 if (status)
1357 goto out;
1358 break;
1359 case SP4_SSV:
1360 /* ssp_ops */
1361 READ_BUF(4);
1362 dummy = be32_to_cpup(p++);
1363 READ_BUF(dummy * 4);
1364 p += dummy;
1365
1366 READ_BUF(4);
1367 dummy = be32_to_cpup(p++);
1368 READ_BUF(dummy * 4);
1369 p += dummy;
1370
1371 /* ssp_hash_algs<> */
1372 READ_BUF(4);
1373 tmp = be32_to_cpup(p++);
1374 while (tmp--) {
1375 READ_BUF(4);
1376 dummy = be32_to_cpup(p++);
1377 READ_BUF(dummy);
1378 p += XDR_QUADLEN(dummy);
1379 }
1380
1381 /* ssp_encr_algs<> */
1382 READ_BUF(4);
1383 tmp = be32_to_cpup(p++);
1384 while (tmp--) {
1385 READ_BUF(4);
1386 dummy = be32_to_cpup(p++);
1387 READ_BUF(dummy);
1388 p += XDR_QUADLEN(dummy);
1389 }
1390
1391 /* ssp_window and ssp_num_gss_handles */
1392 READ_BUF(8);
1393 dummy = be32_to_cpup(p++);
1394 dummy = be32_to_cpup(p++);
1395 break;
1396 default:
1397 goto xdr_error;
1398 }
1399
1400 /* Ignore Implementation ID */
1401 READ_BUF(4); /* nfs_impl_id4 array length */
1402 dummy = be32_to_cpup(p++);
1403
1404 if (dummy > 1)
1405 goto xdr_error;
1406
1407 if (dummy == 1) {
1408 /* nii_domain */
1409 READ_BUF(4);
1410 dummy = be32_to_cpup(p++);
1411 READ_BUF(dummy);
1412 p += XDR_QUADLEN(dummy);
1413
1414 /* nii_name */
1415 READ_BUF(4);
1416 dummy = be32_to_cpup(p++);
1417 READ_BUF(dummy);
1418 p += XDR_QUADLEN(dummy);
1419
1420 /* nii_date */
1421 READ_BUF(12);
1422 p += 3;
1423 }
1424 DECODE_TAIL;
1425 }
1426
1427 static __be32
1428 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1429 struct nfsd4_create_session *sess)
1430 {
1431 DECODE_HEAD;
1432 u32 dummy;
1433
1434 READ_BUF(16);
1435 COPYMEM(&sess->clientid, 8);
1436 sess->seqid = be32_to_cpup(p++);
1437 sess->flags = be32_to_cpup(p++);
1438
1439 /* Fore channel attrs */
1440 READ_BUF(28);
1441 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1442 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1443 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1444 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1445 sess->fore_channel.maxops = be32_to_cpup(p++);
1446 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1447 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1448 if (sess->fore_channel.nr_rdma_attrs == 1) {
1449 READ_BUF(4);
1450 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1451 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1452 dprintk("Too many fore channel attr bitmaps!\n");
1453 goto xdr_error;
1454 }
1455
1456 /* Back channel attrs */
1457 READ_BUF(28);
1458 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1459 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1460 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1461 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1462 sess->back_channel.maxops = be32_to_cpup(p++);
1463 sess->back_channel.maxreqs = be32_to_cpup(p++);
1464 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1465 if (sess->back_channel.nr_rdma_attrs == 1) {
1466 READ_BUF(4);
1467 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1468 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1469 dprintk("Too many back channel attr bitmaps!\n");
1470 goto xdr_error;
1471 }
1472
1473 READ_BUF(4);
1474 sess->callback_prog = be32_to_cpup(p++);
1475 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1476 DECODE_TAIL;
1477 }
1478
1479 static __be32
1480 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1481 struct nfsd4_destroy_session *destroy_session)
1482 {
1483 DECODE_HEAD;
1484 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1485 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1486
1487 DECODE_TAIL;
1488 }
1489
1490 static __be32
1491 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1492 struct nfsd4_free_stateid *free_stateid)
1493 {
1494 DECODE_HEAD;
1495
1496 READ_BUF(sizeof(stateid_t));
1497 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1498 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1499
1500 DECODE_TAIL;
1501 }
1502
1503 static __be32
1504 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1505 struct nfsd4_sequence *seq)
1506 {
1507 DECODE_HEAD;
1508
1509 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1510 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1511 seq->seqid = be32_to_cpup(p++);
1512 seq->slotid = be32_to_cpup(p++);
1513 seq->maxslots = be32_to_cpup(p++);
1514 seq->cachethis = be32_to_cpup(p++);
1515
1516 DECODE_TAIL;
1517 }
1518
1519 static __be32
1520 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1521 {
1522 int i;
1523 __be32 *p, status;
1524 struct nfsd4_test_stateid_id *stateid;
1525
1526 READ_BUF(4);
1527 test_stateid->ts_num_ids = ntohl(*p++);
1528
1529 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1530
1531 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1532 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1533 if (!stateid) {
1534 status = nfserrno(-ENOMEM);
1535 goto out;
1536 }
1537
1538 INIT_LIST_HEAD(&stateid->ts_id_list);
1539 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1540
1541 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1542 if (status)
1543 goto out;
1544 }
1545
1546 status = 0;
1547 out:
1548 return status;
1549 xdr_error:
1550 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1551 status = nfserr_bad_xdr;
1552 goto out;
1553 }
1554
1555 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1556 {
1557 DECODE_HEAD;
1558
1559 READ_BUF(8);
1560 COPYMEM(&dc->clientid, 8);
1561
1562 DECODE_TAIL;
1563 }
1564
1565 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1566 {
1567 DECODE_HEAD;
1568
1569 READ_BUF(4);
1570 rc->rca_one_fs = be32_to_cpup(p++);
1571
1572 DECODE_TAIL;
1573 }
1574
1575 #ifdef CONFIG_NFSD_PNFS
1576 static __be32
1577 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1578 struct nfsd4_getdeviceinfo *gdev)
1579 {
1580 DECODE_HEAD;
1581 u32 num, i;
1582
1583 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1584 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1585 gdev->gd_layout_type = be32_to_cpup(p++);
1586 gdev->gd_maxcount = be32_to_cpup(p++);
1587 num = be32_to_cpup(p++);
1588 if (num) {
1589 READ_BUF(4 * num);
1590 gdev->gd_notify_types = be32_to_cpup(p++);
1591 for (i = 1; i < num; i++) {
1592 if (be32_to_cpup(p++)) {
1593 status = nfserr_inval;
1594 goto out;
1595 }
1596 }
1597 }
1598 DECODE_TAIL;
1599 }
1600
1601 static __be32
1602 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1603 struct nfsd4_layoutget *lgp)
1604 {
1605 DECODE_HEAD;
1606
1607 READ_BUF(36);
1608 lgp->lg_signal = be32_to_cpup(p++);
1609 lgp->lg_layout_type = be32_to_cpup(p++);
1610 lgp->lg_seg.iomode = be32_to_cpup(p++);
1611 p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1612 p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1613 p = xdr_decode_hyper(p, &lgp->lg_minlength);
1614
1615 status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1616 if (status)
1617 return status;
1618
1619 READ_BUF(4);
1620 lgp->lg_maxcount = be32_to_cpup(p++);
1621
1622 DECODE_TAIL;
1623 }
1624
1625 static __be32
1626 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1627 struct nfsd4_layoutcommit *lcp)
1628 {
1629 DECODE_HEAD;
1630 u32 timechange;
1631
1632 READ_BUF(20);
1633 p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1634 p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1635 lcp->lc_reclaim = be32_to_cpup(p++);
1636
1637 status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1638 if (status)
1639 return status;
1640
1641 READ_BUF(4);
1642 lcp->lc_newoffset = be32_to_cpup(p++);
1643 if (lcp->lc_newoffset) {
1644 READ_BUF(8);
1645 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1646 } else
1647 lcp->lc_last_wr = 0;
1648 READ_BUF(4);
1649 timechange = be32_to_cpup(p++);
1650 if (timechange) {
1651 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1652 if (status)
1653 return status;
1654 } else {
1655 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1656 }
1657 READ_BUF(8);
1658 lcp->lc_layout_type = be32_to_cpup(p++);
1659
1660 /*
1661 * Save the layout update in XDR format and let the layout driver deal
1662 * with it later.
1663 */
1664 lcp->lc_up_len = be32_to_cpup(p++);
1665 if (lcp->lc_up_len > 0) {
1666 READ_BUF(lcp->lc_up_len);
1667 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1668 }
1669
1670 DECODE_TAIL;
1671 }
1672
1673 static __be32
1674 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1675 struct nfsd4_layoutreturn *lrp)
1676 {
1677 DECODE_HEAD;
1678
1679 READ_BUF(16);
1680 lrp->lr_reclaim = be32_to_cpup(p++);
1681 lrp->lr_layout_type = be32_to_cpup(p++);
1682 lrp->lr_seg.iomode = be32_to_cpup(p++);
1683 lrp->lr_return_type = be32_to_cpup(p++);
1684 if (lrp->lr_return_type == RETURN_FILE) {
1685 READ_BUF(16);
1686 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1687 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1688
1689 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1690 if (status)
1691 return status;
1692
1693 READ_BUF(4);
1694 lrp->lrf_body_len = be32_to_cpup(p++);
1695 if (lrp->lrf_body_len > 0) {
1696 READ_BUF(lrp->lrf_body_len);
1697 READMEM(lrp->lrf_body, lrp->lrf_body_len);
1698 }
1699 } else {
1700 lrp->lr_seg.offset = 0;
1701 lrp->lr_seg.length = NFS4_MAX_UINT64;
1702 }
1703
1704 DECODE_TAIL;
1705 }
1706 #endif /* CONFIG_NFSD_PNFS */
1707
1708 static __be32
1709 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1710 struct nfsd4_fallocate *fallocate)
1711 {
1712 DECODE_HEAD;
1713
1714 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1715 if (status)
1716 return status;
1717
1718 READ_BUF(16);
1719 p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1720 xdr_decode_hyper(p, &fallocate->falloc_length);
1721
1722 DECODE_TAIL;
1723 }
1724
1725 static __be32
1726 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1727 {
1728 DECODE_HEAD;
1729
1730 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1731 if (status)
1732 return status;
1733 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1734 if (status)
1735 return status;
1736
1737 READ_BUF(8 + 8 + 8);
1738 p = xdr_decode_hyper(p, &clone->cl_src_pos);
1739 p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1740 p = xdr_decode_hyper(p, &clone->cl_count);
1741 DECODE_TAIL;
1742 }
1743
1744 static __be32
1745 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1746 {
1747 DECODE_HEAD;
1748 unsigned int tmp;
1749
1750 status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1751 if (status)
1752 return status;
1753 status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1754 if (status)
1755 return status;
1756
1757 READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1758 p = xdr_decode_hyper(p, &copy->cp_src_pos);
1759 p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1760 p = xdr_decode_hyper(p, &copy->cp_count);
1761 copy->cp_consecutive = be32_to_cpup(p++);
1762 copy->cp_synchronous = be32_to_cpup(p++);
1763 tmp = be32_to_cpup(p); /* Source server list not supported */
1764
1765 DECODE_TAIL;
1766 }
1767
1768 static __be32
1769 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1770 {
1771 DECODE_HEAD;
1772
1773 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1774 if (status)
1775 return status;
1776
1777 READ_BUF(8 + 4);
1778 p = xdr_decode_hyper(p, &seek->seek_offset);
1779 seek->seek_whence = be32_to_cpup(p);
1780
1781 DECODE_TAIL;
1782 }
1783
1784 static __be32
1785 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1786 {
1787 return nfs_ok;
1788 }
1789
1790 static __be32
1791 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1792 {
1793 return nfserr_notsupp;
1794 }
1795
1796 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1797
1798 static const nfsd4_dec nfsd4_dec_ops[] = {
1799 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1800 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1801 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1802 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1803 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1804 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1805 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1806 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1807 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1808 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1809 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1810 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1811 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1812 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1813 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1814 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1815 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1816 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1817 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1818 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1819 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1820 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1821 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1822 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1823 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1824 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1825 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1826 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1827 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1828 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1829 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1830 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1831 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1832 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1833 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1834 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1835 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1836
1837 /* new operations for NFSv4.1 */
1838 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1839 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1840 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1841 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1842 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1843 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1844 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1845 #ifdef CONFIG_NFSD_PNFS
1846 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1847 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1848 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit,
1849 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget,
1850 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn,
1851 #else
1852 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1853 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1854 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1855 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1856 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1857 #endif
1858 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1859 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1860 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1861 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1862 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1863 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1864 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1865
1866 /* new operations for NFSv4.2 */
1867 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1868 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy,
1869 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
1870 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1871 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
1872 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
1873 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
1874 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp,
1875 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1876 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1877 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
1878 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
1879 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone,
1880 };
1881
1882 static inline bool
1883 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1884 {
1885 if (op->opnum < FIRST_NFS4_OP)
1886 return false;
1887 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1888 return false;
1889 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1890 return false;
1891 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1892 return false;
1893 return true;
1894 }
1895
1896 static __be32
1897 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1898 {
1899 DECODE_HEAD;
1900 struct nfsd4_op *op;
1901 bool cachethis = false;
1902 int auth_slack= argp->rqstp->rq_auth_slack;
1903 int max_reply = auth_slack + 8; /* opcnt, status */
1904 int readcount = 0;
1905 int readbytes = 0;
1906 int i;
1907
1908 READ_BUF(4);
1909 argp->taglen = be32_to_cpup(p++);
1910 READ_BUF(argp->taglen);
1911 SAVEMEM(argp->tag, argp->taglen);
1912 READ_BUF(8);
1913 argp->minorversion = be32_to_cpup(p++);
1914 argp->opcnt = be32_to_cpup(p++);
1915 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1916
1917 if (argp->taglen > NFSD4_MAX_TAGLEN)
1918 goto xdr_error;
1919 if (argp->opcnt > 100)
1920 goto xdr_error;
1921
1922 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1923 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1924 if (!argp->ops) {
1925 argp->ops = argp->iops;
1926 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1927 goto xdr_error;
1928 }
1929 }
1930
1931 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1932 argp->opcnt = 0;
1933
1934 for (i = 0; i < argp->opcnt; i++) {
1935 op = &argp->ops[i];
1936 op->replay = NULL;
1937
1938 READ_BUF(4);
1939 op->opnum = be32_to_cpup(p++);
1940
1941 if (nfsd4_opnum_in_range(argp, op))
1942 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1943 else {
1944 op->opnum = OP_ILLEGAL;
1945 op->status = nfserr_op_illegal;
1946 }
1947 op->opdesc = OPDESC(op);
1948 /*
1949 * We'll try to cache the result in the DRC if any one
1950 * op in the compound wants to be cached:
1951 */
1952 cachethis |= nfsd4_cache_this_op(op);
1953
1954 if (op->opnum == OP_READ) {
1955 readcount++;
1956 readbytes += nfsd4_max_reply(argp->rqstp, op);
1957 } else
1958 max_reply += nfsd4_max_reply(argp->rqstp, op);
1959 /*
1960 * OP_LOCK and OP_LOCKT may return a conflicting lock.
1961 * (Special case because it will just skip encoding this
1962 * if it runs out of xdr buffer space, and it is the only
1963 * operation that behaves this way.)
1964 */
1965 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1966 max_reply += NFS4_OPAQUE_LIMIT;
1967
1968 if (op->status) {
1969 argp->opcnt = i+1;
1970 break;
1971 }
1972 }
1973 /* Sessions make the DRC unnecessary: */
1974 if (argp->minorversion)
1975 cachethis = false;
1976 svc_reserve(argp->rqstp, max_reply + readbytes);
1977 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1978
1979 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1980 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1981
1982 DECODE_TAIL;
1983 }
1984
1985 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
1986 struct svc_export *exp)
1987 {
1988 if (exp->ex_flags & NFSEXP_V4ROOT) {
1989 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
1990 *p++ = 0;
1991 } else if (IS_I_VERSION(inode)) {
1992 p = xdr_encode_hyper(p, nfsd4_change_attribute(inode));
1993 } else {
1994 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1995 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1996 }
1997 return p;
1998 }
1999
2000 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2001 {
2002 *p++ = cpu_to_be32(c->atomic);
2003 if (c->change_supported) {
2004 p = xdr_encode_hyper(p, c->before_change);
2005 p = xdr_encode_hyper(p, c->after_change);
2006 } else {
2007 *p++ = cpu_to_be32(c->before_ctime_sec);
2008 *p++ = cpu_to_be32(c->before_ctime_nsec);
2009 *p++ = cpu_to_be32(c->after_ctime_sec);
2010 *p++ = cpu_to_be32(c->after_ctime_nsec);
2011 }
2012 return p;
2013 }
2014
2015 /* Encode as an array of strings the string given with components
2016 * separated @sep, escaped with esc_enter and esc_exit.
2017 */
2018 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2019 char *components, char esc_enter,
2020 char esc_exit)
2021 {
2022 __be32 *p;
2023 __be32 pathlen;
2024 int pathlen_offset;
2025 int strlen, count=0;
2026 char *str, *end, *next;
2027
2028 dprintk("nfsd4_encode_components(%s)\n", components);
2029
2030 pathlen_offset = xdr->buf->len;
2031 p = xdr_reserve_space(xdr, 4);
2032 if (!p)
2033 return nfserr_resource;
2034 p++; /* We will fill this in with @count later */
2035
2036 end = str = components;
2037 while (*end) {
2038 bool found_esc = false;
2039
2040 /* try to parse as esc_start, ..., esc_end, sep */
2041 if (*str == esc_enter) {
2042 for (; *end && (*end != esc_exit); end++)
2043 /* find esc_exit or end of string */;
2044 next = end + 1;
2045 if (*end && (!*next || *next == sep)) {
2046 str++;
2047 found_esc = true;
2048 }
2049 }
2050
2051 if (!found_esc)
2052 for (; *end && (*end != sep); end++)
2053 /* find sep or end of string */;
2054
2055 strlen = end - str;
2056 if (strlen) {
2057 p = xdr_reserve_space(xdr, strlen + 4);
2058 if (!p)
2059 return nfserr_resource;
2060 p = xdr_encode_opaque(p, str, strlen);
2061 count++;
2062 }
2063 else
2064 end++;
2065 if (found_esc)
2066 end = next;
2067
2068 str = end;
2069 }
2070 pathlen = htonl(count);
2071 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2072 return 0;
2073 }
2074
2075 /* Encode as an array of strings the string given with components
2076 * separated @sep.
2077 */
2078 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2079 char *components)
2080 {
2081 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2082 }
2083
2084 /*
2085 * encode a location element of a fs_locations structure
2086 */
2087 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2088 struct nfsd4_fs_location *location)
2089 {
2090 __be32 status;
2091
2092 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2093 '[', ']');
2094 if (status)
2095 return status;
2096 status = nfsd4_encode_components(xdr, '/', location->path);
2097 if (status)
2098 return status;
2099 return 0;
2100 }
2101
2102 /*
2103 * Encode a path in RFC3530 'pathname4' format
2104 */
2105 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2106 const struct path *root,
2107 const struct path *path)
2108 {
2109 struct path cur = *path;
2110 __be32 *p;
2111 struct dentry **components = NULL;
2112 unsigned int ncomponents = 0;
2113 __be32 err = nfserr_jukebox;
2114
2115 dprintk("nfsd4_encode_components(");
2116
2117 path_get(&cur);
2118 /* First walk the path up to the nfsd root, and store the
2119 * dentries/path components in an array.
2120 */
2121 for (;;) {
2122 if (path_equal(&cur, root))
2123 break;
2124 if (cur.dentry == cur.mnt->mnt_root) {
2125 if (follow_up(&cur))
2126 continue;
2127 goto out_free;
2128 }
2129 if ((ncomponents & 15) == 0) {
2130 struct dentry **new;
2131 new = krealloc(components,
2132 sizeof(*new) * (ncomponents + 16),
2133 GFP_KERNEL);
2134 if (!new)
2135 goto out_free;
2136 components = new;
2137 }
2138 components[ncomponents++] = cur.dentry;
2139 cur.dentry = dget_parent(cur.dentry);
2140 }
2141 err = nfserr_resource;
2142 p = xdr_reserve_space(xdr, 4);
2143 if (!p)
2144 goto out_free;
2145 *p++ = cpu_to_be32(ncomponents);
2146
2147 while (ncomponents) {
2148 struct dentry *dentry = components[ncomponents - 1];
2149 unsigned int len;
2150
2151 spin_lock(&dentry->d_lock);
2152 len = dentry->d_name.len;
2153 p = xdr_reserve_space(xdr, len + 4);
2154 if (!p) {
2155 spin_unlock(&dentry->d_lock);
2156 goto out_free;
2157 }
2158 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2159 dprintk("/%pd", dentry);
2160 spin_unlock(&dentry->d_lock);
2161 dput(dentry);
2162 ncomponents--;
2163 }
2164
2165 err = 0;
2166 out_free:
2167 dprintk(")\n");
2168 while (ncomponents)
2169 dput(components[--ncomponents]);
2170 kfree(components);
2171 path_put(&cur);
2172 return err;
2173 }
2174
2175 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2176 struct svc_rqst *rqstp, const struct path *path)
2177 {
2178 struct svc_export *exp_ps;
2179 __be32 res;
2180
2181 exp_ps = rqst_find_fsidzero_export(rqstp);
2182 if (IS_ERR(exp_ps))
2183 return nfserrno(PTR_ERR(exp_ps));
2184 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2185 exp_put(exp_ps);
2186 return res;
2187 }
2188
2189 /*
2190 * encode a fs_locations structure
2191 */
2192 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2193 struct svc_rqst *rqstp, struct svc_export *exp)
2194 {
2195 __be32 status;
2196 int i;
2197 __be32 *p;
2198 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2199
2200 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2201 if (status)
2202 return status;
2203 p = xdr_reserve_space(xdr, 4);
2204 if (!p)
2205 return nfserr_resource;
2206 *p++ = cpu_to_be32(fslocs->locations_count);
2207 for (i=0; i<fslocs->locations_count; i++) {
2208 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2209 if (status)
2210 return status;
2211 }
2212 return 0;
2213 }
2214
2215 static u32 nfs4_file_type(umode_t mode)
2216 {
2217 switch (mode & S_IFMT) {
2218 case S_IFIFO: return NF4FIFO;
2219 case S_IFCHR: return NF4CHR;
2220 case S_IFDIR: return NF4DIR;
2221 case S_IFBLK: return NF4BLK;
2222 case S_IFLNK: return NF4LNK;
2223 case S_IFREG: return NF4REG;
2224 case S_IFSOCK: return NF4SOCK;
2225 default: return NF4BAD;
2226 };
2227 }
2228
2229 static inline __be32
2230 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2231 struct nfs4_ace *ace)
2232 {
2233 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2234 return nfs4_acl_write_who(xdr, ace->whotype);
2235 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2236 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2237 else
2238 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2239 }
2240
2241 static inline __be32
2242 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2243 {
2244 __be32 *p;
2245 unsigned long i = hweight_long(layout_types);
2246
2247 p = xdr_reserve_space(xdr, 4 + 4 * i);
2248 if (!p)
2249 return nfserr_resource;
2250
2251 *p++ = cpu_to_be32(i);
2252
2253 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2254 if (layout_types & (1 << i))
2255 *p++ = cpu_to_be32(i);
2256
2257 return 0;
2258 }
2259
2260 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2261 FATTR4_WORD0_RDATTR_ERROR)
2262 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2263 #define WORD2_ABSENT_FS_ATTRS 0
2264
2265 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2266 static inline __be32
2267 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2268 void *context, int len)
2269 {
2270 __be32 *p;
2271
2272 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2273 if (!p)
2274 return nfserr_resource;
2275
2276 /*
2277 * For now we use a 0 here to indicate the null translation; in
2278 * the future we may place a call to translation code here.
2279 */
2280 *p++ = cpu_to_be32(0); /* lfs */
2281 *p++ = cpu_to_be32(0); /* pi */
2282 p = xdr_encode_opaque(p, context, len);
2283 return 0;
2284 }
2285 #else
2286 static inline __be32
2287 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2288 void *context, int len)
2289 { return 0; }
2290 #endif
2291
2292 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2293 {
2294 /* As per referral draft: */
2295 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2296 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2297 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2298 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2299 *rdattr_err = NFSERR_MOVED;
2300 else
2301 return nfserr_moved;
2302 }
2303 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2304 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2305 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2306 return 0;
2307 }
2308
2309
2310 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2311 {
2312 struct path path = exp->ex_path;
2313 int err;
2314
2315 path_get(&path);
2316 while (follow_up(&path)) {
2317 if (path.dentry != path.mnt->mnt_root)
2318 break;
2319 }
2320 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2321 path_put(&path);
2322 return err;
2323 }
2324
2325 static __be32
2326 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2327 {
2328 __be32 *p;
2329
2330 if (bmval2) {
2331 p = xdr_reserve_space(xdr, 16);
2332 if (!p)
2333 goto out_resource;
2334 *p++ = cpu_to_be32(3);
2335 *p++ = cpu_to_be32(bmval0);
2336 *p++ = cpu_to_be32(bmval1);
2337 *p++ = cpu_to_be32(bmval2);
2338 } else if (bmval1) {
2339 p = xdr_reserve_space(xdr, 12);
2340 if (!p)
2341 goto out_resource;
2342 *p++ = cpu_to_be32(2);
2343 *p++ = cpu_to_be32(bmval0);
2344 *p++ = cpu_to_be32(bmval1);
2345 } else {
2346 p = xdr_reserve_space(xdr, 8);
2347 if (!p)
2348 goto out_resource;
2349 *p++ = cpu_to_be32(1);
2350 *p++ = cpu_to_be32(bmval0);
2351 }
2352
2353 return 0;
2354 out_resource:
2355 return nfserr_resource;
2356 }
2357
2358 /*
2359 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2360 * ourselves.
2361 */
2362 static __be32
2363 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2364 struct svc_export *exp,
2365 struct dentry *dentry, u32 *bmval,
2366 struct svc_rqst *rqstp, int ignore_crossmnt)
2367 {
2368 u32 bmval0 = bmval[0];
2369 u32 bmval1 = bmval[1];
2370 u32 bmval2 = bmval[2];
2371 struct kstat stat;
2372 struct svc_fh *tempfh = NULL;
2373 struct kstatfs statfs;
2374 __be32 *p;
2375 int starting_len = xdr->buf->len;
2376 int attrlen_offset;
2377 __be32 attrlen;
2378 u32 dummy;
2379 u64 dummy64;
2380 u32 rdattr_err = 0;
2381 __be32 status;
2382 int err;
2383 struct nfs4_acl *acl = NULL;
2384 void *context = NULL;
2385 int contextlen;
2386 bool contextsupport = false;
2387 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2388 u32 minorversion = resp->cstate.minorversion;
2389 struct path path = {
2390 .mnt = exp->ex_path.mnt,
2391 .dentry = dentry,
2392 };
2393 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2394
2395 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2396 BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2397
2398 if (exp->ex_fslocs.migrated) {
2399 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2400 if (status)
2401 goto out;
2402 }
2403
2404 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2405 if (err)
2406 goto out_nfserr;
2407 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2408 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2409 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2410 FATTR4_WORD1_SPACE_TOTAL))) {
2411 err = vfs_statfs(&path, &statfs);
2412 if (err)
2413 goto out_nfserr;
2414 }
2415 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2416 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2417 status = nfserr_jukebox;
2418 if (!tempfh)
2419 goto out;
2420 fh_init(tempfh, NFS4_FHSIZE);
2421 status = fh_compose(tempfh, exp, dentry, NULL);
2422 if (status)
2423 goto out;
2424 fhp = tempfh;
2425 }
2426 if (bmval0 & FATTR4_WORD0_ACL) {
2427 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2428 if (err == -EOPNOTSUPP)
2429 bmval0 &= ~FATTR4_WORD0_ACL;
2430 else if (err == -EINVAL) {
2431 status = nfserr_attrnotsupp;
2432 goto out;
2433 } else if (err != 0)
2434 goto out_nfserr;
2435 }
2436
2437 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2438 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2439 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2440 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2441 err = security_inode_getsecctx(d_inode(dentry),
2442 &context, &contextlen);
2443 else
2444 err = -EOPNOTSUPP;
2445 contextsupport = (err == 0);
2446 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2447 if (err == -EOPNOTSUPP)
2448 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2449 else if (err)
2450 goto out_nfserr;
2451 }
2452 }
2453 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2454
2455 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2456 if (status)
2457 goto out;
2458
2459 attrlen_offset = xdr->buf->len;
2460 p = xdr_reserve_space(xdr, 4);
2461 if (!p)
2462 goto out_resource;
2463 p++; /* to be backfilled later */
2464
2465 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2466 u32 supp[3];
2467
2468 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2469
2470 if (!IS_POSIXACL(dentry->d_inode))
2471 supp[0] &= ~FATTR4_WORD0_ACL;
2472 if (!contextsupport)
2473 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2474 if (!supp[2]) {
2475 p = xdr_reserve_space(xdr, 12);
2476 if (!p)
2477 goto out_resource;
2478 *p++ = cpu_to_be32(2);
2479 *p++ = cpu_to_be32(supp[0]);
2480 *p++ = cpu_to_be32(supp[1]);
2481 } else {
2482 p = xdr_reserve_space(xdr, 16);
2483 if (!p)
2484 goto out_resource;
2485 *p++ = cpu_to_be32(3);
2486 *p++ = cpu_to_be32(supp[0]);
2487 *p++ = cpu_to_be32(supp[1]);
2488 *p++ = cpu_to_be32(supp[2]);
2489 }
2490 }
2491 if (bmval0 & FATTR4_WORD0_TYPE) {
2492 p = xdr_reserve_space(xdr, 4);
2493 if (!p)
2494 goto out_resource;
2495 dummy = nfs4_file_type(stat.mode);
2496 if (dummy == NF4BAD) {
2497 status = nfserr_serverfault;
2498 goto out;
2499 }
2500 *p++ = cpu_to_be32(dummy);
2501 }
2502 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2503 p = xdr_reserve_space(xdr, 4);
2504 if (!p)
2505 goto out_resource;
2506 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2507 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2508 else
2509 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2510 NFS4_FH_VOL_RENAME);
2511 }
2512 if (bmval0 & FATTR4_WORD0_CHANGE) {
2513 p = xdr_reserve_space(xdr, 8);
2514 if (!p)
2515 goto out_resource;
2516 p = encode_change(p, &stat, d_inode(dentry), exp);
2517 }
2518 if (bmval0 & FATTR4_WORD0_SIZE) {
2519 p = xdr_reserve_space(xdr, 8);
2520 if (!p)
2521 goto out_resource;
2522 p = xdr_encode_hyper(p, stat.size);
2523 }
2524 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2525 p = xdr_reserve_space(xdr, 4);
2526 if (!p)
2527 goto out_resource;
2528 *p++ = cpu_to_be32(1);
2529 }
2530 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2531 p = xdr_reserve_space(xdr, 4);
2532 if (!p)
2533 goto out_resource;
2534 *p++ = cpu_to_be32(1);
2535 }
2536 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2537 p = xdr_reserve_space(xdr, 4);
2538 if (!p)
2539 goto out_resource;
2540 *p++ = cpu_to_be32(0);
2541 }
2542 if (bmval0 & FATTR4_WORD0_FSID) {
2543 p = xdr_reserve_space(xdr, 16);
2544 if (!p)
2545 goto out_resource;
2546 if (exp->ex_fslocs.migrated) {
2547 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2548 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2549 } else switch(fsid_source(fhp)) {
2550 case FSIDSOURCE_FSID:
2551 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2552 p = xdr_encode_hyper(p, (u64)0);
2553 break;
2554 case FSIDSOURCE_DEV:
2555 *p++ = cpu_to_be32(0);
2556 *p++ = cpu_to_be32(MAJOR(stat.dev));
2557 *p++ = cpu_to_be32(0);
2558 *p++ = cpu_to_be32(MINOR(stat.dev));
2559 break;
2560 case FSIDSOURCE_UUID:
2561 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2562 EX_UUID_LEN);
2563 break;
2564 }
2565 }
2566 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2567 p = xdr_reserve_space(xdr, 4);
2568 if (!p)
2569 goto out_resource;
2570 *p++ = cpu_to_be32(0);
2571 }
2572 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2573 p = xdr_reserve_space(xdr, 4);
2574 if (!p)
2575 goto out_resource;
2576 *p++ = cpu_to_be32(nn->nfsd4_lease);
2577 }
2578 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2579 p = xdr_reserve_space(xdr, 4);
2580 if (!p)
2581 goto out_resource;
2582 *p++ = cpu_to_be32(rdattr_err);
2583 }
2584 if (bmval0 & FATTR4_WORD0_ACL) {
2585 struct nfs4_ace *ace;
2586
2587 if (acl == NULL) {
2588 p = xdr_reserve_space(xdr, 4);
2589 if (!p)
2590 goto out_resource;
2591
2592 *p++ = cpu_to_be32(0);
2593 goto out_acl;
2594 }
2595 p = xdr_reserve_space(xdr, 4);
2596 if (!p)
2597 goto out_resource;
2598 *p++ = cpu_to_be32(acl->naces);
2599
2600 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2601 p = xdr_reserve_space(xdr, 4*3);
2602 if (!p)
2603 goto out_resource;
2604 *p++ = cpu_to_be32(ace->type);
2605 *p++ = cpu_to_be32(ace->flag);
2606 *p++ = cpu_to_be32(ace->access_mask &
2607 NFS4_ACE_MASK_ALL);
2608 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2609 if (status)
2610 goto out;
2611 }
2612 }
2613 out_acl:
2614 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2615 p = xdr_reserve_space(xdr, 4);
2616 if (!p)
2617 goto out_resource;
2618 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2619 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2620 }
2621 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2622 p = xdr_reserve_space(xdr, 4);
2623 if (!p)
2624 goto out_resource;
2625 *p++ = cpu_to_be32(1);
2626 }
2627 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2628 p = xdr_reserve_space(xdr, 4);
2629 if (!p)
2630 goto out_resource;
2631 *p++ = cpu_to_be32(0);
2632 }
2633 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2634 p = xdr_reserve_space(xdr, 4);
2635 if (!p)
2636 goto out_resource;
2637 *p++ = cpu_to_be32(1);
2638 }
2639 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2640 p = xdr_reserve_space(xdr, 4);
2641 if (!p)
2642 goto out_resource;
2643 *p++ = cpu_to_be32(1);
2644 }
2645 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2646 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2647 if (!p)
2648 goto out_resource;
2649 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2650 fhp->fh_handle.fh_size);
2651 }
2652 if (bmval0 & FATTR4_WORD0_FILEID) {
2653 p = xdr_reserve_space(xdr, 8);
2654 if (!p)
2655 goto out_resource;
2656 p = xdr_encode_hyper(p, stat.ino);
2657 }
2658 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2659 p = xdr_reserve_space(xdr, 8);
2660 if (!p)
2661 goto out_resource;
2662 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2663 }
2664 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2665 p = xdr_reserve_space(xdr, 8);
2666 if (!p)
2667 goto out_resource;
2668 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2669 }
2670 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2671 p = xdr_reserve_space(xdr, 8);
2672 if (!p)
2673 goto out_resource;
2674 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2675 }
2676 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2677 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2678 if (status)
2679 goto out;
2680 }
2681 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2682 p = xdr_reserve_space(xdr, 4);
2683 if (!p)
2684 goto out_resource;
2685 *p++ = cpu_to_be32(1);
2686 }
2687 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2688 p = xdr_reserve_space(xdr, 8);
2689 if (!p)
2690 goto out_resource;
2691 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2692 }
2693 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2694 p = xdr_reserve_space(xdr, 4);
2695 if (!p)
2696 goto out_resource;
2697 *p++ = cpu_to_be32(255);
2698 }
2699 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2700 p = xdr_reserve_space(xdr, 4);
2701 if (!p)
2702 goto out_resource;
2703 *p++ = cpu_to_be32(statfs.f_namelen);
2704 }
2705 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2706 p = xdr_reserve_space(xdr, 8);
2707 if (!p)
2708 goto out_resource;
2709 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2710 }
2711 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2712 p = xdr_reserve_space(xdr, 8);
2713 if (!p)
2714 goto out_resource;
2715 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2716 }
2717 if (bmval1 & FATTR4_WORD1_MODE) {
2718 p = xdr_reserve_space(xdr, 4);
2719 if (!p)
2720 goto out_resource;
2721 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2722 }
2723 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2724 p = xdr_reserve_space(xdr, 4);
2725 if (!p)
2726 goto out_resource;
2727 *p++ = cpu_to_be32(1);
2728 }
2729 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2730 p = xdr_reserve_space(xdr, 4);
2731 if (!p)
2732 goto out_resource;
2733 *p++ = cpu_to_be32(stat.nlink);
2734 }
2735 if (bmval1 & FATTR4_WORD1_OWNER) {
2736 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2737 if (status)
2738 goto out;
2739 }
2740 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2741 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2742 if (status)
2743 goto out;
2744 }
2745 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2746 p = xdr_reserve_space(xdr, 8);
2747 if (!p)
2748 goto out_resource;
2749 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2750 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2751 }
2752 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2753 p = xdr_reserve_space(xdr, 8);
2754 if (!p)
2755 goto out_resource;
2756 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2757 p = xdr_encode_hyper(p, dummy64);
2758 }
2759 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2760 p = xdr_reserve_space(xdr, 8);
2761 if (!p)
2762 goto out_resource;
2763 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2764 p = xdr_encode_hyper(p, dummy64);
2765 }
2766 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2767 p = xdr_reserve_space(xdr, 8);
2768 if (!p)
2769 goto out_resource;
2770 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2771 p = xdr_encode_hyper(p, dummy64);
2772 }
2773 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2774 p = xdr_reserve_space(xdr, 8);
2775 if (!p)
2776 goto out_resource;
2777 dummy64 = (u64)stat.blocks << 9;
2778 p = xdr_encode_hyper(p, dummy64);
2779 }
2780 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2781 p = xdr_reserve_space(xdr, 12);
2782 if (!p)
2783 goto out_resource;
2784 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2785 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2786 }
2787 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2788 p = xdr_reserve_space(xdr, 12);
2789 if (!p)
2790 goto out_resource;
2791 *p++ = cpu_to_be32(0);
2792 *p++ = cpu_to_be32(1);
2793 *p++ = cpu_to_be32(0);
2794 }
2795 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2796 p = xdr_reserve_space(xdr, 12);
2797 if (!p)
2798 goto out_resource;
2799 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2800 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2801 }
2802 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2803 p = xdr_reserve_space(xdr, 12);
2804 if (!p)
2805 goto out_resource;
2806 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2807 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2808 }
2809 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2810 struct kstat parent_stat;
2811 u64 ino = stat.ino;
2812
2813 p = xdr_reserve_space(xdr, 8);
2814 if (!p)
2815 goto out_resource;
2816 /*
2817 * Get parent's attributes if not ignoring crossmount
2818 * and this is the root of a cross-mounted filesystem.
2819 */
2820 if (ignore_crossmnt == 0 &&
2821 dentry == exp->ex_path.mnt->mnt_root) {
2822 err = get_parent_attributes(exp, &parent_stat);
2823 if (err)
2824 goto out_nfserr;
2825 ino = parent_stat.ino;
2826 }
2827 p = xdr_encode_hyper(p, ino);
2828 }
2829 #ifdef CONFIG_NFSD_PNFS
2830 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2831 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2832 if (status)
2833 goto out;
2834 }
2835
2836 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2837 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2838 if (status)
2839 goto out;
2840 }
2841
2842 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2843 p = xdr_reserve_space(xdr, 4);
2844 if (!p)
2845 goto out_resource;
2846 *p++ = cpu_to_be32(stat.blksize);
2847 }
2848 #endif /* CONFIG_NFSD_PNFS */
2849 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2850 u32 supp[3];
2851
2852 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2853 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2854 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2855 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2856
2857 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2858 if (status)
2859 goto out;
2860 }
2861
2862 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2863 status = nfsd4_encode_security_label(xdr, rqstp, context,
2864 contextlen);
2865 if (status)
2866 goto out;
2867 }
2868
2869 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2870 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2871 status = nfs_ok;
2872
2873 out:
2874 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2875 if (context)
2876 security_release_secctx(context, contextlen);
2877 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2878 kfree(acl);
2879 if (tempfh) {
2880 fh_put(tempfh);
2881 kfree(tempfh);
2882 }
2883 if (status)
2884 xdr_truncate_encode(xdr, starting_len);
2885 return status;
2886 out_nfserr:
2887 status = nfserrno(err);
2888 goto out;
2889 out_resource:
2890 status = nfserr_resource;
2891 goto out;
2892 }
2893
2894 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2895 struct xdr_buf *buf, __be32 *p, int bytes)
2896 {
2897 xdr->scratch.iov_len = 0;
2898 memset(buf, 0, sizeof(struct xdr_buf));
2899 buf->head[0].iov_base = p;
2900 buf->head[0].iov_len = 0;
2901 buf->len = 0;
2902 xdr->buf = buf;
2903 xdr->iov = buf->head;
2904 xdr->p = p;
2905 xdr->end = (void *)p + bytes;
2906 buf->buflen = bytes;
2907 }
2908
2909 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2910 struct svc_fh *fhp, struct svc_export *exp,
2911 struct dentry *dentry, u32 *bmval,
2912 struct svc_rqst *rqstp, int ignore_crossmnt)
2913 {
2914 struct xdr_buf dummy;
2915 struct xdr_stream xdr;
2916 __be32 ret;
2917
2918 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2919 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2920 ignore_crossmnt);
2921 *p = xdr.p;
2922 return ret;
2923 }
2924
2925 static inline int attributes_need_mount(u32 *bmval)
2926 {
2927 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2928 return 1;
2929 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2930 return 1;
2931 return 0;
2932 }
2933
2934 static __be32
2935 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2936 const char *name, int namlen)
2937 {
2938 struct svc_export *exp = cd->rd_fhp->fh_export;
2939 struct dentry *dentry;
2940 __be32 nfserr;
2941 int ignore_crossmnt = 0;
2942
2943 dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2944 if (IS_ERR(dentry))
2945 return nfserrno(PTR_ERR(dentry));
2946 if (d_really_is_negative(dentry)) {
2947 /*
2948 * we're not holding the i_mutex here, so there's
2949 * a window where this directory entry could have gone
2950 * away.
2951 */
2952 dput(dentry);
2953 return nfserr_noent;
2954 }
2955
2956 exp_get(exp);
2957 /*
2958 * In the case of a mountpoint, the client may be asking for
2959 * attributes that are only properties of the underlying filesystem
2960 * as opposed to the cross-mounted file system. In such a case,
2961 * we will not follow the cross mount and will fill the attribtutes
2962 * directly from the mountpoint dentry.
2963 */
2964 if (nfsd_mountpoint(dentry, exp)) {
2965 int err;
2966
2967 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2968 && !attributes_need_mount(cd->rd_bmval)) {
2969 ignore_crossmnt = 1;
2970 goto out_encode;
2971 }
2972 /*
2973 * Why the heck aren't we just using nfsd_lookup??
2974 * Different "."/".." handling? Something else?
2975 * At least, add a comment here to explain....
2976 */
2977 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2978 if (err) {
2979 nfserr = nfserrno(err);
2980 goto out_put;
2981 }
2982 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2983 if (nfserr)
2984 goto out_put;
2985
2986 }
2987 out_encode:
2988 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2989 cd->rd_rqstp, ignore_crossmnt);
2990 out_put:
2991 dput(dentry);
2992 exp_put(exp);
2993 return nfserr;
2994 }
2995
2996 static __be32 *
2997 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2998 {
2999 __be32 *p;
3000
3001 p = xdr_reserve_space(xdr, 20);
3002 if (!p)
3003 return NULL;
3004 *p++ = htonl(2);
3005 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3006 *p++ = htonl(0); /* bmval1 */
3007
3008 *p++ = htonl(4); /* attribute length */
3009 *p++ = nfserr; /* no htonl */
3010 return p;
3011 }
3012
3013 static int
3014 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3015 loff_t offset, u64 ino, unsigned int d_type)
3016 {
3017 struct readdir_cd *ccd = ccdv;
3018 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3019 struct xdr_stream *xdr = cd->xdr;
3020 int start_offset = xdr->buf->len;
3021 int cookie_offset;
3022 u32 name_and_cookie;
3023 int entry_bytes;
3024 __be32 nfserr = nfserr_toosmall;
3025 __be64 wire_offset;
3026 __be32 *p;
3027
3028 /* In nfsv4, "." and ".." never make it onto the wire.. */
3029 if (name && isdotent(name, namlen)) {
3030 cd->common.err = nfs_ok;
3031 return 0;
3032 }
3033
3034 if (cd->cookie_offset) {
3035 wire_offset = cpu_to_be64(offset);
3036 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3037 &wire_offset, 8);
3038 }
3039
3040 p = xdr_reserve_space(xdr, 4);
3041 if (!p)
3042 goto fail;
3043 *p++ = xdr_one; /* mark entry present */
3044 cookie_offset = xdr->buf->len;
3045 p = xdr_reserve_space(xdr, 3*4 + namlen);
3046 if (!p)
3047 goto fail;
3048 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
3049 p = xdr_encode_array(p, name, namlen); /* name length & name */
3050
3051 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3052 switch (nfserr) {
3053 case nfs_ok:
3054 break;
3055 case nfserr_resource:
3056 nfserr = nfserr_toosmall;
3057 goto fail;
3058 case nfserr_noent:
3059 xdr_truncate_encode(xdr, start_offset);
3060 goto skip_entry;
3061 default:
3062 /*
3063 * If the client requested the RDATTR_ERROR attribute,
3064 * we stuff the error code into this attribute
3065 * and continue. If this attribute was not requested,
3066 * then in accordance with the spec, we fail the
3067 * entire READDIR operation(!)
3068 */
3069 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3070 goto fail;
3071 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3072 if (p == NULL) {
3073 nfserr = nfserr_toosmall;
3074 goto fail;
3075 }
3076 }
3077 nfserr = nfserr_toosmall;
3078 entry_bytes = xdr->buf->len - start_offset;
3079 if (entry_bytes > cd->rd_maxcount)
3080 goto fail;
3081 cd->rd_maxcount -= entry_bytes;
3082 /*
3083 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3084 * let's always let through the first entry, at least:
3085 */
3086 if (!cd->rd_dircount)
3087 goto fail;
3088 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3089 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3090 goto fail;
3091 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3092
3093 cd->cookie_offset = cookie_offset;
3094 skip_entry:
3095 cd->common.err = nfs_ok;
3096 return 0;
3097 fail:
3098 xdr_truncate_encode(xdr, start_offset);
3099 cd->common.err = nfserr;
3100 return -EINVAL;
3101 }
3102
3103 static __be32
3104 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3105 {
3106 __be32 *p;
3107
3108 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3109 if (!p)
3110 return nfserr_resource;
3111 *p++ = cpu_to_be32(sid->si_generation);
3112 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3113 sizeof(stateid_opaque_t));
3114 return 0;
3115 }
3116
3117 static __be32
3118 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3119 {
3120 struct xdr_stream *xdr = &resp->xdr;
3121 __be32 *p;
3122
3123 p = xdr_reserve_space(xdr, 8);
3124 if (!p)
3125 return nfserr_resource;
3126 *p++ = cpu_to_be32(access->ac_supported);
3127 *p++ = cpu_to_be32(access->ac_resp_access);
3128 return 0;
3129 }
3130
3131 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3132 {
3133 struct xdr_stream *xdr = &resp->xdr;
3134 __be32 *p;
3135
3136 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3137 if (!p)
3138 return nfserr_resource;
3139 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3140 NFS4_MAX_SESSIONID_LEN);
3141 *p++ = cpu_to_be32(bcts->dir);
3142 /* Upshifting from TCP to RDMA is not supported */
3143 *p++ = cpu_to_be32(0);
3144 return 0;
3145 }
3146
3147 static __be32
3148 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3149 {
3150 struct xdr_stream *xdr = &resp->xdr;
3151
3152 return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3153 }
3154
3155
3156 static __be32
3157 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3158 {
3159 struct xdr_stream *xdr = &resp->xdr;
3160 __be32 *p;
3161
3162 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3163 if (!p)
3164 return nfserr_resource;
3165 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3166 NFS4_VERIFIER_SIZE);
3167 return 0;
3168 }
3169
3170 static __be32
3171 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3172 {
3173 struct xdr_stream *xdr = &resp->xdr;
3174 __be32 *p;
3175
3176 p = xdr_reserve_space(xdr, 20);
3177 if (!p)
3178 return nfserr_resource;
3179 encode_cinfo(p, &create->cr_cinfo);
3180 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3181 create->cr_bmval[1], create->cr_bmval[2]);
3182 return 0;
3183 }
3184
3185 static __be32
3186 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3187 {
3188 struct svc_fh *fhp = getattr->ga_fhp;
3189 struct xdr_stream *xdr = &resp->xdr;
3190
3191 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3192 getattr->ga_bmval, resp->rqstp, 0);
3193 }
3194
3195 static __be32
3196 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3197 {
3198 struct xdr_stream *xdr = &resp->xdr;
3199 struct svc_fh *fhp = *fhpp;
3200 unsigned int len;
3201 __be32 *p;
3202
3203 len = fhp->fh_handle.fh_size;
3204 p = xdr_reserve_space(xdr, len + 4);
3205 if (!p)
3206 return nfserr_resource;
3207 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3208 return 0;
3209 }
3210
3211 /*
3212 * Including all fields other than the name, a LOCK4denied structure requires
3213 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3214 */
3215 static __be32
3216 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3217 {
3218 struct xdr_netobj *conf = &ld->ld_owner;
3219 __be32 *p;
3220
3221 again:
3222 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3223 if (!p) {
3224 /*
3225 * Don't fail to return the result just because we can't
3226 * return the conflicting open:
3227 */
3228 if (conf->len) {
3229 kfree(conf->data);
3230 conf->len = 0;
3231 conf->data = NULL;
3232 goto again;
3233 }
3234 return nfserr_resource;
3235 }
3236 p = xdr_encode_hyper(p, ld->ld_start);
3237 p = xdr_encode_hyper(p, ld->ld_length);
3238 *p++ = cpu_to_be32(ld->ld_type);
3239 if (conf->len) {
3240 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3241 p = xdr_encode_opaque(p, conf->data, conf->len);
3242 kfree(conf->data);
3243 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
3244 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3245 *p++ = cpu_to_be32(0); /* length of owner name */
3246 }
3247 return nfserr_denied;
3248 }
3249
3250 static __be32
3251 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3252 {
3253 struct xdr_stream *xdr = &resp->xdr;
3254
3255 if (!nfserr)
3256 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3257 else if (nfserr == nfserr_denied)
3258 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3259
3260 return nfserr;
3261 }
3262
3263 static __be32
3264 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3265 {
3266 struct xdr_stream *xdr = &resp->xdr;
3267
3268 if (nfserr == nfserr_denied)
3269 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3270 return nfserr;
3271 }
3272
3273 static __be32
3274 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3275 {
3276 struct xdr_stream *xdr = &resp->xdr;
3277
3278 return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3279 }
3280
3281
3282 static __be32
3283 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3284 {
3285 struct xdr_stream *xdr = &resp->xdr;
3286 __be32 *p;
3287
3288 p = xdr_reserve_space(xdr, 20);
3289 if (!p)
3290 return nfserr_resource;
3291 p = encode_cinfo(p, &link->li_cinfo);
3292 return 0;
3293 }
3294
3295
3296 static __be32
3297 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3298 {
3299 struct xdr_stream *xdr = &resp->xdr;
3300 __be32 *p;
3301
3302 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3303 if (nfserr)
3304 return nfserr;
3305 p = xdr_reserve_space(xdr, 24);
3306 if (!p)
3307 return nfserr_resource;
3308 p = encode_cinfo(p, &open->op_cinfo);
3309 *p++ = cpu_to_be32(open->op_rflags);
3310
3311 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3312 open->op_bmval[2]);
3313 if (nfserr)
3314 return nfserr;
3315
3316 p = xdr_reserve_space(xdr, 4);
3317 if (!p)
3318 return nfserr_resource;
3319
3320 *p++ = cpu_to_be32(open->op_delegate_type);
3321 switch (open->op_delegate_type) {
3322 case NFS4_OPEN_DELEGATE_NONE:
3323 break;
3324 case NFS4_OPEN_DELEGATE_READ:
3325 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3326 if (nfserr)
3327 return nfserr;
3328 p = xdr_reserve_space(xdr, 20);
3329 if (!p)
3330 return nfserr_resource;
3331 *p++ = cpu_to_be32(open->op_recall);
3332
3333 /*
3334 * TODO: ACE's in delegations
3335 */
3336 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3337 *p++ = cpu_to_be32(0);
3338 *p++ = cpu_to_be32(0);
3339 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3340 break;
3341 case NFS4_OPEN_DELEGATE_WRITE:
3342 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3343 if (nfserr)
3344 return nfserr;
3345 p = xdr_reserve_space(xdr, 32);
3346 if (!p)
3347 return nfserr_resource;
3348 *p++ = cpu_to_be32(0);
3349
3350 /*
3351 * TODO: space_limit's in delegations
3352 */
3353 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3354 *p++ = cpu_to_be32(~(u32)0);
3355 *p++ = cpu_to_be32(~(u32)0);
3356
3357 /*
3358 * TODO: ACE's in delegations
3359 */
3360 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3361 *p++ = cpu_to_be32(0);
3362 *p++ = cpu_to_be32(0);
3363 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3364 break;
3365 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3366 switch (open->op_why_no_deleg) {
3367 case WND4_CONTENTION:
3368 case WND4_RESOURCE:
3369 p = xdr_reserve_space(xdr, 8);
3370 if (!p)
3371 return nfserr_resource;
3372 *p++ = cpu_to_be32(open->op_why_no_deleg);
3373 /* deleg signaling not supported yet: */
3374 *p++ = cpu_to_be32(0);
3375 break;
3376 default:
3377 p = xdr_reserve_space(xdr, 4);
3378 if (!p)
3379 return nfserr_resource;
3380 *p++ = cpu_to_be32(open->op_why_no_deleg);
3381 }
3382 break;
3383 default:
3384 BUG();
3385 }
3386 /* XXX save filehandle here */
3387 return 0;
3388 }
3389
3390 static __be32
3391 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3392 {
3393 struct xdr_stream *xdr = &resp->xdr;
3394
3395 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3396 }
3397
3398 static __be32
3399 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3400 {
3401 struct xdr_stream *xdr = &resp->xdr;
3402
3403 return nfsd4_encode_stateid(xdr, &od->od_stateid);
3404 }
3405
3406 static __be32 nfsd4_encode_splice_read(
3407 struct nfsd4_compoundres *resp,
3408 struct nfsd4_read *read,
3409 struct file *file, unsigned long maxcount)
3410 {
3411 struct xdr_stream *xdr = &resp->xdr;
3412 struct xdr_buf *buf = xdr->buf;
3413 u32 eof;
3414 long len;
3415 int space_left;
3416 __be32 nfserr;
3417 __be32 *p = xdr->p - 2;
3418
3419 /* Make sure there will be room for padding if needed */
3420 if (xdr->end - xdr->p < 1)
3421 return nfserr_resource;
3422
3423 len = maxcount;
3424 nfserr = nfsd_splice_read(read->rd_rqstp, file,
3425 read->rd_offset, &maxcount);
3426 if (nfserr) {
3427 /*
3428 * nfsd_splice_actor may have already messed with the
3429 * page length; reset it so as not to confuse
3430 * xdr_truncate_encode:
3431 */
3432 buf->page_len = 0;
3433 return nfserr;
3434 }
3435
3436 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3437 d_inode(read->rd_fhp->fh_dentry)->i_size);
3438
3439 *(p++) = htonl(eof);
3440 *(p++) = htonl(maxcount);
3441
3442 buf->page_len = maxcount;
3443 buf->len += maxcount;
3444 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3445 / PAGE_SIZE;
3446
3447 /* Use rest of head for padding and remaining ops: */
3448 buf->tail[0].iov_base = xdr->p;
3449 buf->tail[0].iov_len = 0;
3450 xdr->iov = buf->tail;
3451 if (maxcount&3) {
3452 int pad = 4 - (maxcount&3);
3453
3454 *(xdr->p++) = 0;
3455
3456 buf->tail[0].iov_base += maxcount&3;
3457 buf->tail[0].iov_len = pad;
3458 buf->len += pad;
3459 }
3460
3461 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3462 buf->buflen - buf->len);
3463 buf->buflen = buf->len + space_left;
3464 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3465
3466 return 0;
3467 }
3468
3469 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3470 struct nfsd4_read *read,
3471 struct file *file, unsigned long maxcount)
3472 {
3473 struct xdr_stream *xdr = &resp->xdr;
3474 u32 eof;
3475 int v;
3476 int starting_len = xdr->buf->len - 8;
3477 long len;
3478 int thislen;
3479 __be32 nfserr;
3480 __be32 tmp;
3481 __be32 *p;
3482 u32 zzz = 0;
3483 int pad;
3484
3485 len = maxcount;
3486 v = 0;
3487
3488 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3489 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3490 WARN_ON_ONCE(!p);
3491 resp->rqstp->rq_vec[v].iov_base = p;
3492 resp->rqstp->rq_vec[v].iov_len = thislen;
3493 v++;
3494 len -= thislen;
3495
3496 while (len) {
3497 thislen = min_t(long, len, PAGE_SIZE);
3498 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3499 WARN_ON_ONCE(!p);
3500 resp->rqstp->rq_vec[v].iov_base = p;
3501 resp->rqstp->rq_vec[v].iov_len = thislen;
3502 v++;
3503 len -= thislen;
3504 }
3505 read->rd_vlen = v;
3506
3507 len = maxcount;
3508 nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3509 read->rd_vlen, &maxcount);
3510 if (nfserr)
3511 return nfserr;
3512 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3513
3514 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3515 d_inode(read->rd_fhp->fh_dentry)->i_size);
3516
3517 tmp = htonl(eof);
3518 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3519 tmp = htonl(maxcount);
3520 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3521
3522 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3523 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3524 &zzz, pad);
3525 return 0;
3526
3527 }
3528
3529 static __be32
3530 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3531 struct nfsd4_read *read)
3532 {
3533 unsigned long maxcount;
3534 struct xdr_stream *xdr = &resp->xdr;
3535 struct file *file = read->rd_filp;
3536 int starting_len = xdr->buf->len;
3537 struct raparms *ra = NULL;
3538 __be32 *p;
3539
3540 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3541 if (!p) {
3542 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3543 return nfserr_resource;
3544 }
3545 if (resp->xdr.buf->page_len &&
3546 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3547 WARN_ON_ONCE(1);
3548 return nfserr_resource;
3549 }
3550 xdr_commit_encode(xdr);
3551
3552 maxcount = svc_max_payload(resp->rqstp);
3553 maxcount = min_t(unsigned long, maxcount,
3554 (xdr->buf->buflen - xdr->buf->len));
3555 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3556
3557 if (read->rd_tmp_file)
3558 ra = nfsd_init_raparms(file);
3559
3560 if (file->f_op->splice_read &&
3561 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3562 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3563 else
3564 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3565
3566 if (ra)
3567 nfsd_put_raparams(file, ra);
3568
3569 if (nfserr)
3570 xdr_truncate_encode(xdr, starting_len);
3571
3572 return nfserr;
3573 }
3574
3575 static __be32
3576 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3577 {
3578 int maxcount;
3579 __be32 wire_count;
3580 int zero = 0;
3581 struct xdr_stream *xdr = &resp->xdr;
3582 int length_offset = xdr->buf->len;
3583 __be32 *p;
3584
3585 p = xdr_reserve_space(xdr, 4);
3586 if (!p)
3587 return nfserr_resource;
3588 maxcount = PAGE_SIZE;
3589
3590 p = xdr_reserve_space(xdr, maxcount);
3591 if (!p)
3592 return nfserr_resource;
3593 /*
3594 * XXX: By default, vfs_readlink() will truncate symlinks if they
3595 * would overflow the buffer. Is this kosher in NFSv4? If not, one
3596 * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3597 * that truncation occurred, and return NFS4ERR_RESOURCE.
3598 */
3599 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3600 (char *)p, &maxcount);
3601 if (nfserr == nfserr_isdir)
3602 nfserr = nfserr_inval;
3603 if (nfserr) {
3604 xdr_truncate_encode(xdr, length_offset);
3605 return nfserr;
3606 }
3607
3608 wire_count = htonl(maxcount);
3609 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3610 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3611 if (maxcount & 3)
3612 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3613 &zero, 4 - (maxcount&3));
3614 return 0;
3615 }
3616
3617 static __be32
3618 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3619 {
3620 int maxcount;
3621 int bytes_left;
3622 loff_t offset;
3623 __be64 wire_offset;
3624 struct xdr_stream *xdr = &resp->xdr;
3625 int starting_len = xdr->buf->len;
3626 __be32 *p;
3627
3628 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3629 if (!p)
3630 return nfserr_resource;
3631
3632 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3633 *p++ = cpu_to_be32(0);
3634 *p++ = cpu_to_be32(0);
3635 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3636 - (char *)resp->xdr.buf->head[0].iov_base;
3637
3638 /*
3639 * Number of bytes left for directory entries allowing for the
3640 * final 8 bytes of the readdir and a following failed op:
3641 */
3642 bytes_left = xdr->buf->buflen - xdr->buf->len
3643 - COMPOUND_ERR_SLACK_SPACE - 8;
3644 if (bytes_left < 0) {
3645 nfserr = nfserr_resource;
3646 goto err_no_verf;
3647 }
3648 maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3649 /*
3650 * Note the rfc defines rd_maxcount as the size of the
3651 * READDIR4resok structure, which includes the verifier above
3652 * and the 8 bytes encoded at the end of this function:
3653 */
3654 if (maxcount < 16) {
3655 nfserr = nfserr_toosmall;
3656 goto err_no_verf;
3657 }
3658 maxcount = min_t(int, maxcount-16, bytes_left);
3659
3660 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3661 if (!readdir->rd_dircount)
3662 readdir->rd_dircount = INT_MAX;
3663
3664 readdir->xdr = xdr;
3665 readdir->rd_maxcount = maxcount;
3666 readdir->common.err = 0;
3667 readdir->cookie_offset = 0;
3668
3669 offset = readdir->rd_cookie;
3670 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3671 &offset,
3672 &readdir->common, nfsd4_encode_dirent);
3673 if (nfserr == nfs_ok &&
3674 readdir->common.err == nfserr_toosmall &&
3675 xdr->buf->len == starting_len + 8) {
3676 /* nothing encoded; which limit did we hit?: */
3677 if (maxcount - 16 < bytes_left)
3678 /* It was the fault of rd_maxcount: */
3679 nfserr = nfserr_toosmall;
3680 else
3681 /* We ran out of buffer space: */
3682 nfserr = nfserr_resource;
3683 }
3684 if (nfserr)
3685 goto err_no_verf;
3686
3687 if (readdir->cookie_offset) {
3688 wire_offset = cpu_to_be64(offset);
3689 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3690 &wire_offset, 8);
3691 }
3692
3693 p = xdr_reserve_space(xdr, 8);
3694 if (!p) {
3695 WARN_ON_ONCE(1);
3696 goto err_no_verf;
3697 }
3698 *p++ = 0; /* no more entries */
3699 *p++ = htonl(readdir->common.err == nfserr_eof);
3700
3701 return 0;
3702 err_no_verf:
3703 xdr_truncate_encode(xdr, starting_len);
3704 return nfserr;
3705 }
3706
3707 static __be32
3708 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3709 {
3710 struct xdr_stream *xdr = &resp->xdr;
3711 __be32 *p;
3712
3713 p = xdr_reserve_space(xdr, 20);
3714 if (!p)
3715 return nfserr_resource;
3716 p = encode_cinfo(p, &remove->rm_cinfo);
3717 return 0;
3718 }
3719
3720 static __be32
3721 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3722 {
3723 struct xdr_stream *xdr = &resp->xdr;
3724 __be32 *p;
3725
3726 p = xdr_reserve_space(xdr, 40);
3727 if (!p)
3728 return nfserr_resource;
3729 p = encode_cinfo(p, &rename->rn_sinfo);
3730 p = encode_cinfo(p, &rename->rn_tinfo);
3731 return 0;
3732 }
3733
3734 static __be32
3735 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
3736 {
3737 u32 i, nflavs, supported;
3738 struct exp_flavor_info *flavs;
3739 struct exp_flavor_info def_flavs[2];
3740 __be32 *p, *flavorsp;
3741 static bool report = true;
3742
3743 if (exp->ex_nflavors) {
3744 flavs = exp->ex_flavors;
3745 nflavs = exp->ex_nflavors;
3746 } else { /* Handling of some defaults in absence of real secinfo: */
3747 flavs = def_flavs;
3748 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3749 nflavs = 2;
3750 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3751 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3752 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3753 nflavs = 1;
3754 flavs[0].pseudoflavor
3755 = svcauth_gss_flavor(exp->ex_client);
3756 } else {
3757 nflavs = 1;
3758 flavs[0].pseudoflavor
3759 = exp->ex_client->flavour->flavour;
3760 }
3761 }
3762
3763 supported = 0;
3764 p = xdr_reserve_space(xdr, 4);
3765 if (!p)
3766 return nfserr_resource;
3767 flavorsp = p++; /* to be backfilled later */
3768
3769 for (i = 0; i < nflavs; i++) {
3770 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3771 struct rpcsec_gss_info info;
3772
3773 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3774 supported++;
3775 p = xdr_reserve_space(xdr, 4 + 4 +
3776 XDR_LEN(info.oid.len) + 4 + 4);
3777 if (!p)
3778 return nfserr_resource;
3779 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3780 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3781 *p++ = cpu_to_be32(info.qop);
3782 *p++ = cpu_to_be32(info.service);
3783 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3784 supported++;
3785 p = xdr_reserve_space(xdr, 4);
3786 if (!p)
3787 return nfserr_resource;
3788 *p++ = cpu_to_be32(pf);
3789 } else {
3790 if (report)
3791 pr_warn("NFS: SECINFO: security flavor %u "
3792 "is not supported\n", pf);
3793 }
3794 }
3795
3796 if (nflavs != supported)
3797 report = false;
3798 *flavorsp = htonl(supported);
3799 return 0;
3800 }
3801
3802 static __be32
3803 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3804 struct nfsd4_secinfo *secinfo)
3805 {
3806 struct xdr_stream *xdr = &resp->xdr;
3807
3808 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
3809 }
3810
3811 static __be32
3812 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3813 struct nfsd4_secinfo_no_name *secinfo)
3814 {
3815 struct xdr_stream *xdr = &resp->xdr;
3816
3817 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
3818 }
3819
3820 /*
3821 * The SETATTR encode routine is special -- it always encodes a bitmap,
3822 * regardless of the error status.
3823 */
3824 static __be32
3825 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3826 {
3827 struct xdr_stream *xdr = &resp->xdr;
3828 __be32 *p;
3829
3830 p = xdr_reserve_space(xdr, 16);
3831 if (!p)
3832 return nfserr_resource;
3833 if (nfserr) {
3834 *p++ = cpu_to_be32(3);
3835 *p++ = cpu_to_be32(0);
3836 *p++ = cpu_to_be32(0);
3837 *p++ = cpu_to_be32(0);
3838 }
3839 else {
3840 *p++ = cpu_to_be32(3);
3841 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3842 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3843 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3844 }
3845 return nfserr;
3846 }
3847
3848 static __be32
3849 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3850 {
3851 struct xdr_stream *xdr = &resp->xdr;
3852 __be32 *p;
3853
3854 if (!nfserr) {
3855 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3856 if (!p)
3857 return nfserr_resource;
3858 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3859 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3860 NFS4_VERIFIER_SIZE);
3861 }
3862 else if (nfserr == nfserr_clid_inuse) {
3863 p = xdr_reserve_space(xdr, 8);
3864 if (!p)
3865 return nfserr_resource;
3866 *p++ = cpu_to_be32(0);
3867 *p++ = cpu_to_be32(0);
3868 }
3869 return nfserr;
3870 }
3871
3872 static __be32
3873 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3874 {
3875 struct xdr_stream *xdr = &resp->xdr;
3876 __be32 *p;
3877
3878 p = xdr_reserve_space(xdr, 16);
3879 if (!p)
3880 return nfserr_resource;
3881 *p++ = cpu_to_be32(write->wr_bytes_written);
3882 *p++ = cpu_to_be32(write->wr_how_written);
3883 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3884 NFS4_VERIFIER_SIZE);
3885 return 0;
3886 }
3887
3888 static __be32
3889 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3890 struct nfsd4_exchange_id *exid)
3891 {
3892 struct xdr_stream *xdr = &resp->xdr;
3893 __be32 *p;
3894 char *major_id;
3895 char *server_scope;
3896 int major_id_sz;
3897 int server_scope_sz;
3898 uint64_t minor_id = 0;
3899
3900 major_id = utsname()->nodename;
3901 major_id_sz = strlen(major_id);
3902 server_scope = utsname()->nodename;
3903 server_scope_sz = strlen(server_scope);
3904
3905 p = xdr_reserve_space(xdr,
3906 8 /* eir_clientid */ +
3907 4 /* eir_sequenceid */ +
3908 4 /* eir_flags */ +
3909 4 /* spr_how */);
3910 if (!p)
3911 return nfserr_resource;
3912
3913 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3914 *p++ = cpu_to_be32(exid->seqid);
3915 *p++ = cpu_to_be32(exid->flags);
3916
3917 *p++ = cpu_to_be32(exid->spa_how);
3918
3919 switch (exid->spa_how) {
3920 case SP4_NONE:
3921 break;
3922 case SP4_MACH_CRED:
3923 /* spo_must_enforce bitmap: */
3924 nfserr = nfsd4_encode_bitmap(xdr,
3925 exid->spo_must_enforce[0],
3926 exid->spo_must_enforce[1],
3927 exid->spo_must_enforce[2]);
3928 if (nfserr)
3929 return nfserr;
3930 /* spo_must_allow bitmap: */
3931 nfserr = nfsd4_encode_bitmap(xdr,
3932 exid->spo_must_allow[0],
3933 exid->spo_must_allow[1],
3934 exid->spo_must_allow[2]);
3935 if (nfserr)
3936 return nfserr;
3937 break;
3938 default:
3939 WARN_ON_ONCE(1);
3940 }
3941
3942 p = xdr_reserve_space(xdr,
3943 8 /* so_minor_id */ +
3944 4 /* so_major_id.len */ +
3945 (XDR_QUADLEN(major_id_sz) * 4) +
3946 4 /* eir_server_scope.len */ +
3947 (XDR_QUADLEN(server_scope_sz) * 4) +
3948 4 /* eir_server_impl_id.count (0) */);
3949 if (!p)
3950 return nfserr_resource;
3951
3952 /* The server_owner struct */
3953 p = xdr_encode_hyper(p, minor_id); /* Minor id */
3954 /* major id */
3955 p = xdr_encode_opaque(p, major_id, major_id_sz);
3956
3957 /* Server scope */
3958 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3959
3960 /* Implementation id */
3961 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
3962 return 0;
3963 }
3964
3965 static __be32
3966 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3967 struct nfsd4_create_session *sess)
3968 {
3969 struct xdr_stream *xdr = &resp->xdr;
3970 __be32 *p;
3971
3972 p = xdr_reserve_space(xdr, 24);
3973 if (!p)
3974 return nfserr_resource;
3975 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3976 NFS4_MAX_SESSIONID_LEN);
3977 *p++ = cpu_to_be32(sess->seqid);
3978 *p++ = cpu_to_be32(sess->flags);
3979
3980 p = xdr_reserve_space(xdr, 28);
3981 if (!p)
3982 return nfserr_resource;
3983 *p++ = cpu_to_be32(0); /* headerpadsz */
3984 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3985 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3986 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3987 *p++ = cpu_to_be32(sess->fore_channel.maxops);
3988 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3989 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3990
3991 if (sess->fore_channel.nr_rdma_attrs) {
3992 p = xdr_reserve_space(xdr, 4);
3993 if (!p)
3994 return nfserr_resource;
3995 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3996 }
3997
3998 p = xdr_reserve_space(xdr, 28);
3999 if (!p)
4000 return nfserr_resource;
4001 *p++ = cpu_to_be32(0); /* headerpadsz */
4002 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4003 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4004 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4005 *p++ = cpu_to_be32(sess->back_channel.maxops);
4006 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4007 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4008
4009 if (sess->back_channel.nr_rdma_attrs) {
4010 p = xdr_reserve_space(xdr, 4);
4011 if (!p)
4012 return nfserr_resource;
4013 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4014 }
4015 return 0;
4016 }
4017
4018 static __be32
4019 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4020 struct nfsd4_sequence *seq)
4021 {
4022 struct xdr_stream *xdr = &resp->xdr;
4023 __be32 *p;
4024
4025 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4026 if (!p)
4027 return nfserr_resource;
4028 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4029 NFS4_MAX_SESSIONID_LEN);
4030 *p++ = cpu_to_be32(seq->seqid);
4031 *p++ = cpu_to_be32(seq->slotid);
4032 /* Note slotid's are numbered from zero: */
4033 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4034 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4035 *p++ = cpu_to_be32(seq->status_flags);
4036
4037 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4038 return 0;
4039 }
4040
4041 static __be32
4042 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4043 struct nfsd4_test_stateid *test_stateid)
4044 {
4045 struct xdr_stream *xdr = &resp->xdr;
4046 struct nfsd4_test_stateid_id *stateid, *next;
4047 __be32 *p;
4048
4049 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4050 if (!p)
4051 return nfserr_resource;
4052 *p++ = htonl(test_stateid->ts_num_ids);
4053
4054 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4055 *p++ = stateid->ts_id_status;
4056 }
4057
4058 return 0;
4059 }
4060
4061 #ifdef CONFIG_NFSD_PNFS
4062 static __be32
4063 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4064 struct nfsd4_getdeviceinfo *gdev)
4065 {
4066 struct xdr_stream *xdr = &resp->xdr;
4067 const struct nfsd4_layout_ops *ops;
4068 u32 starting_len = xdr->buf->len, needed_len;
4069 __be32 *p;
4070
4071 p = xdr_reserve_space(xdr, 4);
4072 if (!p)
4073 return nfserr_resource;
4074
4075 *p++ = cpu_to_be32(gdev->gd_layout_type);
4076
4077 /* If maxcount is 0 then just update notifications */
4078 if (gdev->gd_maxcount != 0) {
4079 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4080 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4081 if (nfserr) {
4082 /*
4083 * We don't bother to burden the layout drivers with
4084 * enforcing gd_maxcount, just tell the client to
4085 * come back with a bigger buffer if it's not enough.
4086 */
4087 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4088 goto toosmall;
4089 return nfserr;
4090 }
4091 }
4092
4093 if (gdev->gd_notify_types) {
4094 p = xdr_reserve_space(xdr, 4 + 4);
4095 if (!p)
4096 return nfserr_resource;
4097 *p++ = cpu_to_be32(1); /* bitmap length */
4098 *p++ = cpu_to_be32(gdev->gd_notify_types);
4099 } else {
4100 p = xdr_reserve_space(xdr, 4);
4101 if (!p)
4102 return nfserr_resource;
4103 *p++ = 0;
4104 }
4105
4106 return 0;
4107 toosmall:
4108 dprintk("%s: maxcount too small\n", __func__);
4109 needed_len = xdr->buf->len + 4 /* notifications */;
4110 xdr_truncate_encode(xdr, starting_len);
4111 p = xdr_reserve_space(xdr, 4);
4112 if (!p)
4113 return nfserr_resource;
4114 *p++ = cpu_to_be32(needed_len);
4115 return nfserr_toosmall;
4116 }
4117
4118 static __be32
4119 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4120 struct nfsd4_layoutget *lgp)
4121 {
4122 struct xdr_stream *xdr = &resp->xdr;
4123 const struct nfsd4_layout_ops *ops;
4124 __be32 *p;
4125
4126 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4127 if (!p)
4128 return nfserr_resource;
4129
4130 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4131 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4132 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4133 sizeof(stateid_opaque_t));
4134
4135 *p++ = cpu_to_be32(1); /* we always return a single layout */
4136 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4137 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4138 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4139 *p++ = cpu_to_be32(lgp->lg_layout_type);
4140
4141 ops = nfsd4_layout_ops[lgp->lg_layout_type];
4142 return ops->encode_layoutget(xdr, lgp);
4143 }
4144
4145 static __be32
4146 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4147 struct nfsd4_layoutcommit *lcp)
4148 {
4149 struct xdr_stream *xdr = &resp->xdr;
4150 __be32 *p;
4151
4152 p = xdr_reserve_space(xdr, 4);
4153 if (!p)
4154 return nfserr_resource;
4155 *p++ = cpu_to_be32(lcp->lc_size_chg);
4156 if (lcp->lc_size_chg) {
4157 p = xdr_reserve_space(xdr, 8);
4158 if (!p)
4159 return nfserr_resource;
4160 p = xdr_encode_hyper(p, lcp->lc_newsize);
4161 }
4162
4163 return 0;
4164 }
4165
4166 static __be32
4167 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4168 struct nfsd4_layoutreturn *lrp)
4169 {
4170 struct xdr_stream *xdr = &resp->xdr;
4171 __be32 *p;
4172
4173 p = xdr_reserve_space(xdr, 4);
4174 if (!p)
4175 return nfserr_resource;
4176 *p++ = cpu_to_be32(lrp->lrs_present);
4177 if (lrp->lrs_present)
4178 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4179 return 0;
4180 }
4181 #endif /* CONFIG_NFSD_PNFS */
4182
4183 static __be32
4184 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4185 {
4186 __be32 *p;
4187
4188 p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4189 if (!p)
4190 return nfserr_resource;
4191
4192 *p++ = cpu_to_be32(0);
4193 p = xdr_encode_hyper(p, write->wr_bytes_written);
4194 *p++ = cpu_to_be32(write->wr_stable_how);
4195 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4196 NFS4_VERIFIER_SIZE);
4197 return nfs_ok;
4198 }
4199
4200 static __be32
4201 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4202 struct nfsd4_copy *copy)
4203 {
4204 __be32 *p;
4205
4206 nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
4207 if (nfserr)
4208 return nfserr;
4209
4210 p = xdr_reserve_space(&resp->xdr, 4 + 4);
4211 *p++ = cpu_to_be32(copy->cp_consecutive);
4212 *p++ = cpu_to_be32(copy->cp_synchronous);
4213 return 0;
4214 }
4215
4216 static __be32
4217 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4218 struct nfsd4_seek *seek)
4219 {
4220 __be32 *p;
4221
4222 p = xdr_reserve_space(&resp->xdr, 4 + 8);
4223 *p++ = cpu_to_be32(seek->seek_eof);
4224 p = xdr_encode_hyper(p, seek->seek_pos);
4225
4226 return 0;
4227 }
4228
4229 static __be32
4230 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4231 {
4232 return nfserr;
4233 }
4234
4235 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4236
4237 /*
4238 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4239 * since we don't need to filter out obsolete ops as this is
4240 * done in the decoding phase.
4241 */
4242 static const nfsd4_enc nfsd4_enc_ops[] = {
4243 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
4244 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
4245 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
4246 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
4247 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
4248 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4249 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
4250 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
4251 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
4252 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
4253 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
4254 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
4255 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
4256 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
4257 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4258 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
4259 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
4260 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
4261 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
4262 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
4263 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
4264 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
4265 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
4266 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
4267 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
4268 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
4269 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
4270 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
4271 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
4272 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
4273 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
4274 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
4275 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
4276 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4277 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4278 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
4279 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
4280
4281 /* NFSv4.1 operations */
4282 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
4283 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4284 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
4285 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
4286 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
4287 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
4288 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4289 #ifdef CONFIG_NFSD_PNFS
4290 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4291 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4292 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit,
4293 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget,
4294 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn,
4295 #else
4296 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
4297 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4298 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
4299 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
4300 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4301 #endif
4302 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4303 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
4304 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
4305 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
4306 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4307 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
4308 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
4309
4310 /* NFSv4.2 operations */
4311 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4312 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy,
4313 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
4314 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4315 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
4316 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
4317 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
4318 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
4319 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop,
4320 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
4321 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
4322 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
4323 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop,
4324 };
4325
4326 /*
4327 * Calculate whether we still have space to encode repsize bytes.
4328 * There are two considerations:
4329 * - For NFS versions >=4.1, the size of the reply must stay within
4330 * session limits
4331 * - For all NFS versions, we must stay within limited preallocated
4332 * buffer space.
4333 *
4334 * This is called before the operation is processed, so can only provide
4335 * an upper estimate. For some nonidempotent operations (such as
4336 * getattr), it's not necessarily a problem if that estimate is wrong,
4337 * as we can fail it after processing without significant side effects.
4338 */
4339 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4340 {
4341 struct xdr_buf *buf = &resp->rqstp->rq_res;
4342 struct nfsd4_slot *slot = resp->cstate.slot;
4343
4344 if (buf->len + respsize <= buf->buflen)
4345 return nfs_ok;
4346 if (!nfsd4_has_session(&resp->cstate))
4347 return nfserr_resource;
4348 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4349 WARN_ON_ONCE(1);
4350 return nfserr_rep_too_big_to_cache;
4351 }
4352 return nfserr_rep_too_big;
4353 }
4354
4355 void
4356 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4357 {
4358 struct xdr_stream *xdr = &resp->xdr;
4359 struct nfs4_stateowner *so = resp->cstate.replay_owner;
4360 struct svc_rqst *rqstp = resp->rqstp;
4361 const struct nfsd4_operation *opdesc = op->opdesc;
4362 int post_err_offset;
4363 nfsd4_enc encoder;
4364 __be32 *p;
4365
4366 p = xdr_reserve_space(xdr, 8);
4367 if (!p) {
4368 WARN_ON_ONCE(1);
4369 return;
4370 }
4371 *p++ = cpu_to_be32(op->opnum);
4372 post_err_offset = xdr->buf->len;
4373
4374 if (op->opnum == OP_ILLEGAL)
4375 goto status;
4376 if (op->status && opdesc &&
4377 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
4378 goto status;
4379 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4380 !nfsd4_enc_ops[op->opnum]);
4381 encoder = nfsd4_enc_ops[op->opnum];
4382 op->status = encoder(resp, op->status, &op->u);
4383 if (opdesc && opdesc->op_release)
4384 opdesc->op_release(&op->u);
4385 xdr_commit_encode(xdr);
4386
4387 /* nfsd4_check_resp_size guarantees enough room for error status */
4388 if (!op->status) {
4389 int space_needed = 0;
4390 if (!nfsd4_last_compound_op(rqstp))
4391 space_needed = COMPOUND_ERR_SLACK_SPACE;
4392 op->status = nfsd4_check_resp_size(resp, space_needed);
4393 }
4394 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4395 struct nfsd4_slot *slot = resp->cstate.slot;
4396
4397 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4398 op->status = nfserr_rep_too_big_to_cache;
4399 else
4400 op->status = nfserr_rep_too_big;
4401 }
4402 if (op->status == nfserr_resource ||
4403 op->status == nfserr_rep_too_big ||
4404 op->status == nfserr_rep_too_big_to_cache) {
4405 /*
4406 * The operation may have already been encoded or
4407 * partially encoded. No op returns anything additional
4408 * in the case of one of these three errors, so we can
4409 * just truncate back to after the status. But it's a
4410 * bug if we had to do this on a non-idempotent op:
4411 */
4412 warn_on_nonidempotent_op(op);
4413 xdr_truncate_encode(xdr, post_err_offset);
4414 }
4415 if (so) {
4416 int len = xdr->buf->len - post_err_offset;
4417
4418 so->so_replay.rp_status = op->status;
4419 so->so_replay.rp_buflen = len;
4420 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4421 so->so_replay.rp_buf, len);
4422 }
4423 status:
4424 /* Note that op->status is already in network byte order: */
4425 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4426 }
4427
4428 /*
4429 * Encode the reply stored in the stateowner reply cache
4430 *
4431 * XDR note: do not encode rp->rp_buflen: the buffer contains the
4432 * previously sent already encoded operation.
4433 */
4434 void
4435 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4436 {
4437 __be32 *p;
4438 struct nfs4_replay *rp = op->replay;
4439
4440 BUG_ON(!rp);
4441
4442 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4443 if (!p) {
4444 WARN_ON_ONCE(1);
4445 return;
4446 }
4447 *p++ = cpu_to_be32(op->opnum);
4448 *p++ = rp->rp_status; /* already xdr'ed */
4449
4450 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4451 }
4452
4453 int
4454 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4455 {
4456 return xdr_ressize_check(rqstp, p);
4457 }
4458
4459 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4460 {
4461 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4462
4463 if (args->ops != args->iops) {
4464 kfree(args->ops);
4465 args->ops = args->iops;
4466 }
4467 kfree(args->tmpp);
4468 args->tmpp = NULL;
4469 while (args->to_free) {
4470 struct svcxdr_tmpbuf *tb = args->to_free;
4471 args->to_free = tb->next;
4472 kfree(tb);
4473 }
4474 }
4475
4476 int
4477 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4478 {
4479 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4480
4481 if (rqstp->rq_arg.head[0].iov_len % 4) {
4482 /* client is nuts */
4483 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4484 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4485 return 0;
4486 }
4487 args->p = p;
4488 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4489 args->pagelist = rqstp->rq_arg.pages;
4490 args->pagelen = rqstp->rq_arg.page_len;
4491 args->tail = false;
4492 args->tmpp = NULL;
4493 args->to_free = NULL;
4494 args->ops = args->iops;
4495 args->rqstp = rqstp;
4496
4497 return !nfsd4_decode_compound(args);
4498 }
4499
4500 int
4501 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4502 {
4503 /*
4504 * All that remains is to write the tag and operation count...
4505 */
4506 struct nfsd4_compoundres *resp = rqstp->rq_resp;
4507 struct xdr_buf *buf = resp->xdr.buf;
4508
4509 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4510 buf->tail[0].iov_len);
4511
4512 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4513
4514 p = resp->tagp;
4515 *p++ = htonl(resp->taglen);
4516 memcpy(p, resp->tag, resp->taglen);
4517 p += XDR_QUADLEN(resp->taglen);
4518 *p++ = htonl(resp->opcnt);
4519
4520 nfsd4_sequence_done(resp);
4521 return 1;
4522 }
4523
4524 /*
4525 * Local variables:
4526 * c-basic-offset: 8
4527 * End:
4528 */
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