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Merge tag 'v4.5-rockchip-clkfixes1' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.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 /*
61 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
62 * directory in order to indicate to the client that a filesystem boundary is present
63 * We use a fixed fsid for a referral
64 */
65 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
66 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
67
68 static __be32
69 check_filename(char *str, int len)
70 {
71 int i;
72
73 if (len == 0)
74 return nfserr_inval;
75 if (isdotent(str, len))
76 return nfserr_badname;
77 for (i = 0; i < len; i++)
78 if (str[i] == '/')
79 return nfserr_badname;
80 return 0;
81 }
82
83 #define DECODE_HEAD \
84 __be32 *p; \
85 __be32 status
86 #define DECODE_TAIL \
87 status = 0; \
88 out: \
89 return status; \
90 xdr_error: \
91 dprintk("NFSD: xdr error (%s:%d)\n", \
92 __FILE__, __LINE__); \
93 status = nfserr_bad_xdr; \
94 goto out
95
96 #define READMEM(x,nbytes) do { \
97 x = (char *)p; \
98 p += XDR_QUADLEN(nbytes); \
99 } while (0)
100 #define SAVEMEM(x,nbytes) do { \
101 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
102 savemem(argp, p, nbytes) : \
103 (char *)p)) { \
104 dprintk("NFSD: xdr error (%s:%d)\n", \
105 __FILE__, __LINE__); \
106 goto xdr_error; \
107 } \
108 p += XDR_QUADLEN(nbytes); \
109 } while (0)
110 #define COPYMEM(x,nbytes) do { \
111 memcpy((x), p, nbytes); \
112 p += XDR_QUADLEN(nbytes); \
113 } while (0)
114
115 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
116 #define READ_BUF(nbytes) do { \
117 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
118 p = argp->p; \
119 argp->p += XDR_QUADLEN(nbytes); \
120 } else if (!(p = read_buf(argp, nbytes))) { \
121 dprintk("NFSD: xdr error (%s:%d)\n", \
122 __FILE__, __LINE__); \
123 goto xdr_error; \
124 } \
125 } while (0)
126
127 static void next_decode_page(struct nfsd4_compoundargs *argp)
128 {
129 argp->p = page_address(argp->pagelist[0]);
130 argp->pagelist++;
131 if (argp->pagelen < PAGE_SIZE) {
132 argp->end = argp->p + (argp->pagelen>>2);
133 argp->pagelen = 0;
134 } else {
135 argp->end = argp->p + (PAGE_SIZE>>2);
136 argp->pagelen -= PAGE_SIZE;
137 }
138 }
139
140 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
141 {
142 /* We want more bytes than seem to be available.
143 * Maybe we need a new page, maybe we have just run out
144 */
145 unsigned int avail = (char *)argp->end - (char *)argp->p;
146 __be32 *p;
147 if (avail + argp->pagelen < nbytes)
148 return NULL;
149 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
150 return NULL;
151 /* ok, we can do it with the current plus the next page */
152 if (nbytes <= sizeof(argp->tmp))
153 p = argp->tmp;
154 else {
155 kfree(argp->tmpp);
156 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
157 if (!p)
158 return NULL;
159
160 }
161 /*
162 * The following memcpy is safe because read_buf is always
163 * called with nbytes > avail, and the two cases above both
164 * guarantee p points to at least nbytes bytes.
165 */
166 memcpy(p, argp->p, avail);
167 next_decode_page(argp);
168 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
169 argp->p += XDR_QUADLEN(nbytes - avail);
170 return p;
171 }
172
173 static int zero_clientid(clientid_t *clid)
174 {
175 return (clid->cl_boot == 0) && (clid->cl_id == 0);
176 }
177
178 /**
179 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
180 * @argp: NFSv4 compound argument structure
181 * @p: pointer to be freed (with kfree())
182 *
183 * Marks @p to be freed when processing the compound operation
184 * described in @argp finishes.
185 */
186 static void *
187 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
188 {
189 struct svcxdr_tmpbuf *tb;
190
191 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
192 if (!tb)
193 return NULL;
194 tb->next = argp->to_free;
195 argp->to_free = tb;
196 return tb->buf;
197 }
198
199 /*
200 * For xdr strings that need to be passed to other kernel api's
201 * as null-terminated strings.
202 *
203 * Note null-terminating in place usually isn't safe since the
204 * buffer might end on a page boundary.
205 */
206 static char *
207 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
208 {
209 char *p = svcxdr_tmpalloc(argp, len + 1);
210
211 if (!p)
212 return NULL;
213 memcpy(p, buf, len);
214 p[len] = '\0';
215 return p;
216 }
217
218 /**
219 * savemem - duplicate a chunk of memory for later processing
220 * @argp: NFSv4 compound argument structure to be freed with
221 * @p: pointer to be duplicated
222 * @nbytes: length to be duplicated
223 *
224 * Returns a pointer to a copy of @nbytes bytes of memory at @p
225 * that are preserved until processing of the NFSv4 compound
226 * operation described by @argp finishes.
227 */
228 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
229 {
230 void *ret;
231
232 ret = svcxdr_tmpalloc(argp, nbytes);
233 if (!ret)
234 return NULL;
235 memcpy(ret, p, nbytes);
236 return ret;
237 }
238
239 /*
240 * We require the high 32 bits of 'seconds' to be 0, and
241 * we ignore all 32 bits of 'nseconds'.
242 */
243 static __be32
244 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
245 {
246 DECODE_HEAD;
247 u64 sec;
248
249 READ_BUF(12);
250 p = xdr_decode_hyper(p, &sec);
251 tv->tv_sec = sec;
252 tv->tv_nsec = be32_to_cpup(p++);
253 if (tv->tv_nsec >= (u32)1000000000)
254 return nfserr_inval;
255
256 DECODE_TAIL;
257 }
258
259 static __be32
260 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
261 {
262 u32 bmlen;
263 DECODE_HEAD;
264
265 bmval[0] = 0;
266 bmval[1] = 0;
267 bmval[2] = 0;
268
269 READ_BUF(4);
270 bmlen = be32_to_cpup(p++);
271 if (bmlen > 1000)
272 goto xdr_error;
273
274 READ_BUF(bmlen << 2);
275 if (bmlen > 0)
276 bmval[0] = be32_to_cpup(p++);
277 if (bmlen > 1)
278 bmval[1] = be32_to_cpup(p++);
279 if (bmlen > 2)
280 bmval[2] = be32_to_cpup(p++);
281
282 DECODE_TAIL;
283 }
284
285 static __be32
286 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
287 struct iattr *iattr, struct nfs4_acl **acl,
288 struct xdr_netobj *label)
289 {
290 int expected_len, len = 0;
291 u32 dummy32;
292 char *buf;
293
294 DECODE_HEAD;
295 iattr->ia_valid = 0;
296 if ((status = nfsd4_decode_bitmap(argp, bmval)))
297 return status;
298
299 READ_BUF(4);
300 expected_len = be32_to_cpup(p++);
301
302 if (bmval[0] & FATTR4_WORD0_SIZE) {
303 READ_BUF(8);
304 len += 8;
305 p = xdr_decode_hyper(p, &iattr->ia_size);
306 iattr->ia_valid |= ATTR_SIZE;
307 }
308 if (bmval[0] & FATTR4_WORD0_ACL) {
309 u32 nace;
310 struct nfs4_ace *ace;
311
312 READ_BUF(4); len += 4;
313 nace = be32_to_cpup(p++);
314
315 if (nace > NFS4_ACL_MAX)
316 return nfserr_fbig;
317
318 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
319 if (*acl == NULL)
320 return nfserr_jukebox;
321
322 (*acl)->naces = nace;
323 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
324 READ_BUF(16); len += 16;
325 ace->type = be32_to_cpup(p++);
326 ace->flag = be32_to_cpup(p++);
327 ace->access_mask = be32_to_cpup(p++);
328 dummy32 = be32_to_cpup(p++);
329 READ_BUF(dummy32);
330 len += XDR_QUADLEN(dummy32) << 2;
331 READMEM(buf, dummy32);
332 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
333 status = nfs_ok;
334 if (ace->whotype != NFS4_ACL_WHO_NAMED)
335 ;
336 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
337 status = nfsd_map_name_to_gid(argp->rqstp,
338 buf, dummy32, &ace->who_gid);
339 else
340 status = nfsd_map_name_to_uid(argp->rqstp,
341 buf, dummy32, &ace->who_uid);
342 if (status)
343 return status;
344 }
345 } else
346 *acl = NULL;
347 if (bmval[1] & FATTR4_WORD1_MODE) {
348 READ_BUF(4);
349 len += 4;
350 iattr->ia_mode = be32_to_cpup(p++);
351 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
352 iattr->ia_valid |= ATTR_MODE;
353 }
354 if (bmval[1] & FATTR4_WORD1_OWNER) {
355 READ_BUF(4);
356 len += 4;
357 dummy32 = be32_to_cpup(p++);
358 READ_BUF(dummy32);
359 len += (XDR_QUADLEN(dummy32) << 2);
360 READMEM(buf, dummy32);
361 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
362 return status;
363 iattr->ia_valid |= ATTR_UID;
364 }
365 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
366 READ_BUF(4);
367 len += 4;
368 dummy32 = be32_to_cpup(p++);
369 READ_BUF(dummy32);
370 len += (XDR_QUADLEN(dummy32) << 2);
371 READMEM(buf, dummy32);
372 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
373 return status;
374 iattr->ia_valid |= ATTR_GID;
375 }
376 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
377 READ_BUF(4);
378 len += 4;
379 dummy32 = be32_to_cpup(p++);
380 switch (dummy32) {
381 case NFS4_SET_TO_CLIENT_TIME:
382 len += 12;
383 status = nfsd4_decode_time(argp, &iattr->ia_atime);
384 if (status)
385 return status;
386 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
387 break;
388 case NFS4_SET_TO_SERVER_TIME:
389 iattr->ia_valid |= ATTR_ATIME;
390 break;
391 default:
392 goto xdr_error;
393 }
394 }
395 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
396 READ_BUF(4);
397 len += 4;
398 dummy32 = be32_to_cpup(p++);
399 switch (dummy32) {
400 case NFS4_SET_TO_CLIENT_TIME:
401 len += 12;
402 status = nfsd4_decode_time(argp, &iattr->ia_mtime);
403 if (status)
404 return status;
405 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
406 break;
407 case NFS4_SET_TO_SERVER_TIME:
408 iattr->ia_valid |= ATTR_MTIME;
409 break;
410 default:
411 goto xdr_error;
412 }
413 }
414
415 label->len = 0;
416 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
417 if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
418 READ_BUF(4);
419 len += 4;
420 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
421 READ_BUF(4);
422 len += 4;
423 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
424 READ_BUF(4);
425 len += 4;
426 dummy32 = be32_to_cpup(p++);
427 READ_BUF(dummy32);
428 if (dummy32 > NFS4_MAXLABELLEN)
429 return nfserr_badlabel;
430 len += (XDR_QUADLEN(dummy32) << 2);
431 READMEM(buf, dummy32);
432 label->len = dummy32;
433 label->data = svcxdr_dupstr(argp, buf, dummy32);
434 if (!label->data)
435 return nfserr_jukebox;
436 }
437 #endif
438
439 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
440 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
441 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
442 READ_BUF(expected_len - len);
443 else if (len != expected_len)
444 goto xdr_error;
445
446 DECODE_TAIL;
447 }
448
449 static __be32
450 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
451 {
452 DECODE_HEAD;
453
454 READ_BUF(sizeof(stateid_t));
455 sid->si_generation = be32_to_cpup(p++);
456 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
457
458 DECODE_TAIL;
459 }
460
461 static __be32
462 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
463 {
464 DECODE_HEAD;
465
466 READ_BUF(4);
467 access->ac_req_access = be32_to_cpup(p++);
468
469 DECODE_TAIL;
470 }
471
472 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
473 {
474 DECODE_HEAD;
475 u32 dummy, uid, gid;
476 char *machine_name;
477 int i;
478 int nr_secflavs;
479
480 /* callback_sec_params4 */
481 READ_BUF(4);
482 nr_secflavs = be32_to_cpup(p++);
483 if (nr_secflavs)
484 cbs->flavor = (u32)(-1);
485 else
486 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
487 cbs->flavor = 0;
488 for (i = 0; i < nr_secflavs; ++i) {
489 READ_BUF(4);
490 dummy = be32_to_cpup(p++);
491 switch (dummy) {
492 case RPC_AUTH_NULL:
493 /* Nothing to read */
494 if (cbs->flavor == (u32)(-1))
495 cbs->flavor = RPC_AUTH_NULL;
496 break;
497 case RPC_AUTH_UNIX:
498 READ_BUF(8);
499 /* stamp */
500 dummy = be32_to_cpup(p++);
501
502 /* machine name */
503 dummy = be32_to_cpup(p++);
504 READ_BUF(dummy);
505 SAVEMEM(machine_name, dummy);
506
507 /* uid, gid */
508 READ_BUF(8);
509 uid = be32_to_cpup(p++);
510 gid = be32_to_cpup(p++);
511
512 /* more gids */
513 READ_BUF(4);
514 dummy = be32_to_cpup(p++);
515 READ_BUF(dummy * 4);
516 if (cbs->flavor == (u32)(-1)) {
517 kuid_t kuid = make_kuid(&init_user_ns, uid);
518 kgid_t kgid = make_kgid(&init_user_ns, gid);
519 if (uid_valid(kuid) && gid_valid(kgid)) {
520 cbs->uid = kuid;
521 cbs->gid = kgid;
522 cbs->flavor = RPC_AUTH_UNIX;
523 } else {
524 dprintk("RPC_AUTH_UNIX with invalid"
525 "uid or gid ignoring!\n");
526 }
527 }
528 break;
529 case RPC_AUTH_GSS:
530 dprintk("RPC_AUTH_GSS callback secflavor "
531 "not supported!\n");
532 READ_BUF(8);
533 /* gcbp_service */
534 dummy = be32_to_cpup(p++);
535 /* gcbp_handle_from_server */
536 dummy = be32_to_cpup(p++);
537 READ_BUF(dummy);
538 p += XDR_QUADLEN(dummy);
539 /* gcbp_handle_from_client */
540 READ_BUF(4);
541 dummy = be32_to_cpup(p++);
542 READ_BUF(dummy);
543 break;
544 default:
545 dprintk("Illegal callback secflavor\n");
546 return nfserr_inval;
547 }
548 }
549 DECODE_TAIL;
550 }
551
552 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
553 {
554 DECODE_HEAD;
555
556 READ_BUF(4);
557 bc->bc_cb_program = be32_to_cpup(p++);
558 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
559
560 DECODE_TAIL;
561 }
562
563 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
564 {
565 DECODE_HEAD;
566
567 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
568 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
569 bcts->dir = be32_to_cpup(p++);
570 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
571 * could help us figure out we should be using it. */
572 DECODE_TAIL;
573 }
574
575 static __be32
576 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
577 {
578 DECODE_HEAD;
579
580 READ_BUF(4);
581 close->cl_seqid = be32_to_cpup(p++);
582 return nfsd4_decode_stateid(argp, &close->cl_stateid);
583
584 DECODE_TAIL;
585 }
586
587
588 static __be32
589 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
590 {
591 DECODE_HEAD;
592
593 READ_BUF(12);
594 p = xdr_decode_hyper(p, &commit->co_offset);
595 commit->co_count = be32_to_cpup(p++);
596
597 DECODE_TAIL;
598 }
599
600 static __be32
601 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
602 {
603 DECODE_HEAD;
604
605 READ_BUF(4);
606 create->cr_type = be32_to_cpup(p++);
607 switch (create->cr_type) {
608 case NF4LNK:
609 READ_BUF(4);
610 create->cr_datalen = be32_to_cpup(p++);
611 READ_BUF(create->cr_datalen);
612 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
613 if (!create->cr_data)
614 return nfserr_jukebox;
615 break;
616 case NF4BLK:
617 case NF4CHR:
618 READ_BUF(8);
619 create->cr_specdata1 = be32_to_cpup(p++);
620 create->cr_specdata2 = be32_to_cpup(p++);
621 break;
622 case NF4SOCK:
623 case NF4FIFO:
624 case NF4DIR:
625 default:
626 break;
627 }
628
629 READ_BUF(4);
630 create->cr_namelen = be32_to_cpup(p++);
631 READ_BUF(create->cr_namelen);
632 SAVEMEM(create->cr_name, create->cr_namelen);
633 if ((status = check_filename(create->cr_name, create->cr_namelen)))
634 return status;
635
636 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
637 &create->cr_acl, &create->cr_label);
638 if (status)
639 goto out;
640
641 DECODE_TAIL;
642 }
643
644 static inline __be32
645 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
646 {
647 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
648 }
649
650 static inline __be32
651 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
652 {
653 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
654 }
655
656 static __be32
657 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
658 {
659 DECODE_HEAD;
660
661 READ_BUF(4);
662 link->li_namelen = be32_to_cpup(p++);
663 READ_BUF(link->li_namelen);
664 SAVEMEM(link->li_name, link->li_namelen);
665 if ((status = check_filename(link->li_name, link->li_namelen)))
666 return status;
667
668 DECODE_TAIL;
669 }
670
671 static __be32
672 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
673 {
674 DECODE_HEAD;
675
676 /*
677 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
678 */
679 READ_BUF(28);
680 lock->lk_type = be32_to_cpup(p++);
681 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
682 goto xdr_error;
683 lock->lk_reclaim = be32_to_cpup(p++);
684 p = xdr_decode_hyper(p, &lock->lk_offset);
685 p = xdr_decode_hyper(p, &lock->lk_length);
686 lock->lk_is_new = be32_to_cpup(p++);
687
688 if (lock->lk_is_new) {
689 READ_BUF(4);
690 lock->lk_new_open_seqid = be32_to_cpup(p++);
691 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
692 if (status)
693 return status;
694 READ_BUF(8 + sizeof(clientid_t));
695 lock->lk_new_lock_seqid = be32_to_cpup(p++);
696 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
697 lock->lk_new_owner.len = be32_to_cpup(p++);
698 READ_BUF(lock->lk_new_owner.len);
699 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
700 } else {
701 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
702 if (status)
703 return status;
704 READ_BUF(4);
705 lock->lk_old_lock_seqid = be32_to_cpup(p++);
706 }
707
708 DECODE_TAIL;
709 }
710
711 static __be32
712 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
713 {
714 DECODE_HEAD;
715
716 READ_BUF(32);
717 lockt->lt_type = be32_to_cpup(p++);
718 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
719 goto xdr_error;
720 p = xdr_decode_hyper(p, &lockt->lt_offset);
721 p = xdr_decode_hyper(p, &lockt->lt_length);
722 COPYMEM(&lockt->lt_clientid, 8);
723 lockt->lt_owner.len = be32_to_cpup(p++);
724 READ_BUF(lockt->lt_owner.len);
725 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
726
727 DECODE_TAIL;
728 }
729
730 static __be32
731 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
732 {
733 DECODE_HEAD;
734
735 READ_BUF(8);
736 locku->lu_type = be32_to_cpup(p++);
737 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
738 goto xdr_error;
739 locku->lu_seqid = be32_to_cpup(p++);
740 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
741 if (status)
742 return status;
743 READ_BUF(16);
744 p = xdr_decode_hyper(p, &locku->lu_offset);
745 p = xdr_decode_hyper(p, &locku->lu_length);
746
747 DECODE_TAIL;
748 }
749
750 static __be32
751 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
752 {
753 DECODE_HEAD;
754
755 READ_BUF(4);
756 lookup->lo_len = be32_to_cpup(p++);
757 READ_BUF(lookup->lo_len);
758 SAVEMEM(lookup->lo_name, lookup->lo_len);
759 if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
760 return status;
761
762 DECODE_TAIL;
763 }
764
765 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
766 {
767 __be32 *p;
768 u32 w;
769
770 READ_BUF(4);
771 w = be32_to_cpup(p++);
772 *share_access = w & NFS4_SHARE_ACCESS_MASK;
773 *deleg_want = w & NFS4_SHARE_WANT_MASK;
774 if (deleg_when)
775 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
776
777 switch (w & NFS4_SHARE_ACCESS_MASK) {
778 case NFS4_SHARE_ACCESS_READ:
779 case NFS4_SHARE_ACCESS_WRITE:
780 case NFS4_SHARE_ACCESS_BOTH:
781 break;
782 default:
783 return nfserr_bad_xdr;
784 }
785 w &= ~NFS4_SHARE_ACCESS_MASK;
786 if (!w)
787 return nfs_ok;
788 if (!argp->minorversion)
789 return nfserr_bad_xdr;
790 switch (w & NFS4_SHARE_WANT_MASK) {
791 case NFS4_SHARE_WANT_NO_PREFERENCE:
792 case NFS4_SHARE_WANT_READ_DELEG:
793 case NFS4_SHARE_WANT_WRITE_DELEG:
794 case NFS4_SHARE_WANT_ANY_DELEG:
795 case NFS4_SHARE_WANT_NO_DELEG:
796 case NFS4_SHARE_WANT_CANCEL:
797 break;
798 default:
799 return nfserr_bad_xdr;
800 }
801 w &= ~NFS4_SHARE_WANT_MASK;
802 if (!w)
803 return nfs_ok;
804
805 if (!deleg_when) /* open_downgrade */
806 return nfserr_inval;
807 switch (w) {
808 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
809 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
810 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
811 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
812 return nfs_ok;
813 }
814 xdr_error:
815 return nfserr_bad_xdr;
816 }
817
818 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
819 {
820 __be32 *p;
821
822 READ_BUF(4);
823 *x = be32_to_cpup(p++);
824 /* Note: unlinke access bits, deny bits may be zero. */
825 if (*x & ~NFS4_SHARE_DENY_BOTH)
826 return nfserr_bad_xdr;
827 return nfs_ok;
828 xdr_error:
829 return nfserr_bad_xdr;
830 }
831
832 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
833 {
834 __be32 *p;
835
836 READ_BUF(4);
837 o->len = be32_to_cpup(p++);
838
839 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
840 return nfserr_bad_xdr;
841
842 READ_BUF(o->len);
843 SAVEMEM(o->data, o->len);
844 return nfs_ok;
845 xdr_error:
846 return nfserr_bad_xdr;
847 }
848
849 static __be32
850 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
851 {
852 DECODE_HEAD;
853 u32 dummy;
854
855 memset(open->op_bmval, 0, sizeof(open->op_bmval));
856 open->op_iattr.ia_valid = 0;
857 open->op_openowner = NULL;
858
859 open->op_xdr_error = 0;
860 /* seqid, share_access, share_deny, clientid, ownerlen */
861 READ_BUF(4);
862 open->op_seqid = be32_to_cpup(p++);
863 /* decode, yet ignore deleg_when until supported */
864 status = nfsd4_decode_share_access(argp, &open->op_share_access,
865 &open->op_deleg_want, &dummy);
866 if (status)
867 goto xdr_error;
868 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
869 if (status)
870 goto xdr_error;
871 READ_BUF(sizeof(clientid_t));
872 COPYMEM(&open->op_clientid, sizeof(clientid_t));
873 status = nfsd4_decode_opaque(argp, &open->op_owner);
874 if (status)
875 goto xdr_error;
876 READ_BUF(4);
877 open->op_create = be32_to_cpup(p++);
878 switch (open->op_create) {
879 case NFS4_OPEN_NOCREATE:
880 break;
881 case NFS4_OPEN_CREATE:
882 READ_BUF(4);
883 open->op_createmode = be32_to_cpup(p++);
884 switch (open->op_createmode) {
885 case NFS4_CREATE_UNCHECKED:
886 case NFS4_CREATE_GUARDED:
887 status = nfsd4_decode_fattr(argp, open->op_bmval,
888 &open->op_iattr, &open->op_acl, &open->op_label);
889 if (status)
890 goto out;
891 break;
892 case NFS4_CREATE_EXCLUSIVE:
893 READ_BUF(NFS4_VERIFIER_SIZE);
894 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
895 break;
896 case NFS4_CREATE_EXCLUSIVE4_1:
897 if (argp->minorversion < 1)
898 goto xdr_error;
899 READ_BUF(NFS4_VERIFIER_SIZE);
900 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
901 status = nfsd4_decode_fattr(argp, open->op_bmval,
902 &open->op_iattr, &open->op_acl, &open->op_label);
903 if (status)
904 goto out;
905 break;
906 default:
907 goto xdr_error;
908 }
909 break;
910 default:
911 goto xdr_error;
912 }
913
914 /* open_claim */
915 READ_BUF(4);
916 open->op_claim_type = be32_to_cpup(p++);
917 switch (open->op_claim_type) {
918 case NFS4_OPEN_CLAIM_NULL:
919 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
920 READ_BUF(4);
921 open->op_fname.len = be32_to_cpup(p++);
922 READ_BUF(open->op_fname.len);
923 SAVEMEM(open->op_fname.data, open->op_fname.len);
924 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
925 return status;
926 break;
927 case NFS4_OPEN_CLAIM_PREVIOUS:
928 READ_BUF(4);
929 open->op_delegate_type = be32_to_cpup(p++);
930 break;
931 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
932 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
933 if (status)
934 return status;
935 READ_BUF(4);
936 open->op_fname.len = be32_to_cpup(p++);
937 READ_BUF(open->op_fname.len);
938 SAVEMEM(open->op_fname.data, open->op_fname.len);
939 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
940 return status;
941 break;
942 case NFS4_OPEN_CLAIM_FH:
943 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
944 if (argp->minorversion < 1)
945 goto xdr_error;
946 /* void */
947 break;
948 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
949 if (argp->minorversion < 1)
950 goto xdr_error;
951 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
952 if (status)
953 return status;
954 break;
955 default:
956 goto xdr_error;
957 }
958
959 DECODE_TAIL;
960 }
961
962 static __be32
963 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
964 {
965 DECODE_HEAD;
966
967 if (argp->minorversion >= 1)
968 return nfserr_notsupp;
969
970 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
971 if (status)
972 return status;
973 READ_BUF(4);
974 open_conf->oc_seqid = be32_to_cpup(p++);
975
976 DECODE_TAIL;
977 }
978
979 static __be32
980 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
981 {
982 DECODE_HEAD;
983
984 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
985 if (status)
986 return status;
987 READ_BUF(4);
988 open_down->od_seqid = be32_to_cpup(p++);
989 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
990 &open_down->od_deleg_want, NULL);
991 if (status)
992 return status;
993 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
994 if (status)
995 return status;
996 DECODE_TAIL;
997 }
998
999 static __be32
1000 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1001 {
1002 DECODE_HEAD;
1003
1004 READ_BUF(4);
1005 putfh->pf_fhlen = be32_to_cpup(p++);
1006 if (putfh->pf_fhlen > NFS4_FHSIZE)
1007 goto xdr_error;
1008 READ_BUF(putfh->pf_fhlen);
1009 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1010
1011 DECODE_TAIL;
1012 }
1013
1014 static __be32
1015 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1016 {
1017 if (argp->minorversion == 0)
1018 return nfs_ok;
1019 return nfserr_notsupp;
1020 }
1021
1022 static __be32
1023 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1024 {
1025 DECODE_HEAD;
1026
1027 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1028 if (status)
1029 return status;
1030 READ_BUF(12);
1031 p = xdr_decode_hyper(p, &read->rd_offset);
1032 read->rd_length = be32_to_cpup(p++);
1033
1034 DECODE_TAIL;
1035 }
1036
1037 static __be32
1038 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1039 {
1040 DECODE_HEAD;
1041
1042 READ_BUF(24);
1043 p = xdr_decode_hyper(p, &readdir->rd_cookie);
1044 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1045 readdir->rd_dircount = be32_to_cpup(p++);
1046 readdir->rd_maxcount = be32_to_cpup(p++);
1047 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1048 goto out;
1049
1050 DECODE_TAIL;
1051 }
1052
1053 static __be32
1054 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1055 {
1056 DECODE_HEAD;
1057
1058 READ_BUF(4);
1059 remove->rm_namelen = be32_to_cpup(p++);
1060 READ_BUF(remove->rm_namelen);
1061 SAVEMEM(remove->rm_name, remove->rm_namelen);
1062 if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1063 return status;
1064
1065 DECODE_TAIL;
1066 }
1067
1068 static __be32
1069 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1070 {
1071 DECODE_HEAD;
1072
1073 READ_BUF(4);
1074 rename->rn_snamelen = be32_to_cpup(p++);
1075 READ_BUF(rename->rn_snamelen + 4);
1076 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1077 rename->rn_tnamelen = be32_to_cpup(p++);
1078 READ_BUF(rename->rn_tnamelen);
1079 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1080 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1081 return status;
1082 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1083 return status;
1084
1085 DECODE_TAIL;
1086 }
1087
1088 static __be32
1089 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1090 {
1091 DECODE_HEAD;
1092
1093 if (argp->minorversion >= 1)
1094 return nfserr_notsupp;
1095
1096 READ_BUF(sizeof(clientid_t));
1097 COPYMEM(clientid, sizeof(clientid_t));
1098
1099 DECODE_TAIL;
1100 }
1101
1102 static __be32
1103 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1104 struct nfsd4_secinfo *secinfo)
1105 {
1106 DECODE_HEAD;
1107
1108 READ_BUF(4);
1109 secinfo->si_namelen = be32_to_cpup(p++);
1110 READ_BUF(secinfo->si_namelen);
1111 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1112 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1113 if (status)
1114 return status;
1115 DECODE_TAIL;
1116 }
1117
1118 static __be32
1119 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1120 struct nfsd4_secinfo_no_name *sin)
1121 {
1122 DECODE_HEAD;
1123
1124 READ_BUF(4);
1125 sin->sin_style = be32_to_cpup(p++);
1126 DECODE_TAIL;
1127 }
1128
1129 static __be32
1130 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1131 {
1132 __be32 status;
1133
1134 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1135 if (status)
1136 return status;
1137 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1138 &setattr->sa_acl, &setattr->sa_label);
1139 }
1140
1141 static __be32
1142 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1143 {
1144 DECODE_HEAD;
1145
1146 if (argp->minorversion >= 1)
1147 return nfserr_notsupp;
1148
1149 READ_BUF(NFS4_VERIFIER_SIZE);
1150 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1151
1152 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1153 if (status)
1154 return nfserr_bad_xdr;
1155 READ_BUF(8);
1156 setclientid->se_callback_prog = be32_to_cpup(p++);
1157 setclientid->se_callback_netid_len = be32_to_cpup(p++);
1158
1159 READ_BUF(setclientid->se_callback_netid_len + 4);
1160 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1161 setclientid->se_callback_addr_len = be32_to_cpup(p++);
1162
1163 READ_BUF(setclientid->se_callback_addr_len + 4);
1164 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1165 setclientid->se_callback_ident = be32_to_cpup(p++);
1166
1167 DECODE_TAIL;
1168 }
1169
1170 static __be32
1171 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1172 {
1173 DECODE_HEAD;
1174
1175 if (argp->minorversion >= 1)
1176 return nfserr_notsupp;
1177
1178 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1179 COPYMEM(&scd_c->sc_clientid, 8);
1180 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1181
1182 DECODE_TAIL;
1183 }
1184
1185 /* Also used for NVERIFY */
1186 static __be32
1187 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1188 {
1189 DECODE_HEAD;
1190
1191 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1192 goto out;
1193
1194 /* For convenience's sake, we compare raw xdr'd attributes in
1195 * nfsd4_proc_verify */
1196
1197 READ_BUF(4);
1198 verify->ve_attrlen = be32_to_cpup(p++);
1199 READ_BUF(verify->ve_attrlen);
1200 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1201
1202 DECODE_TAIL;
1203 }
1204
1205 static __be32
1206 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1207 {
1208 int avail;
1209 int len;
1210 DECODE_HEAD;
1211
1212 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1213 if (status)
1214 return status;
1215 READ_BUF(16);
1216 p = xdr_decode_hyper(p, &write->wr_offset);
1217 write->wr_stable_how = be32_to_cpup(p++);
1218 if (write->wr_stable_how > 2)
1219 goto xdr_error;
1220 write->wr_buflen = be32_to_cpup(p++);
1221
1222 /* Sorry .. no magic macros for this.. *
1223 * READ_BUF(write->wr_buflen);
1224 * SAVEMEM(write->wr_buf, write->wr_buflen);
1225 */
1226 avail = (char*)argp->end - (char*)argp->p;
1227 if (avail + argp->pagelen < write->wr_buflen) {
1228 dprintk("NFSD: xdr error (%s:%d)\n",
1229 __FILE__, __LINE__);
1230 goto xdr_error;
1231 }
1232 write->wr_head.iov_base = p;
1233 write->wr_head.iov_len = avail;
1234 write->wr_pagelist = argp->pagelist;
1235
1236 len = XDR_QUADLEN(write->wr_buflen) << 2;
1237 if (len >= avail) {
1238 int pages;
1239
1240 len -= avail;
1241
1242 pages = len >> PAGE_SHIFT;
1243 argp->pagelist += pages;
1244 argp->pagelen -= pages * PAGE_SIZE;
1245 len -= pages * PAGE_SIZE;
1246
1247 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1248 argp->pagelist++;
1249 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1250 }
1251 argp->p += XDR_QUADLEN(len);
1252
1253 DECODE_TAIL;
1254 }
1255
1256 static __be32
1257 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1258 {
1259 DECODE_HEAD;
1260
1261 if (argp->minorversion >= 1)
1262 return nfserr_notsupp;
1263
1264 READ_BUF(12);
1265 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1266 rlockowner->rl_owner.len = be32_to_cpup(p++);
1267 READ_BUF(rlockowner->rl_owner.len);
1268 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1269
1270 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1271 return nfserr_inval;
1272 DECODE_TAIL;
1273 }
1274
1275 static __be32
1276 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1277 struct nfsd4_exchange_id *exid)
1278 {
1279 int dummy, tmp;
1280 DECODE_HEAD;
1281
1282 READ_BUF(NFS4_VERIFIER_SIZE);
1283 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1284
1285 status = nfsd4_decode_opaque(argp, &exid->clname);
1286 if (status)
1287 return nfserr_bad_xdr;
1288
1289 READ_BUF(4);
1290 exid->flags = be32_to_cpup(p++);
1291
1292 /* Ignore state_protect4_a */
1293 READ_BUF(4);
1294 exid->spa_how = be32_to_cpup(p++);
1295 switch (exid->spa_how) {
1296 case SP4_NONE:
1297 break;
1298 case SP4_MACH_CRED:
1299 /* spo_must_enforce */
1300 READ_BUF(4);
1301 dummy = be32_to_cpup(p++);
1302 READ_BUF(dummy * 4);
1303 p += dummy;
1304
1305 /* spo_must_allow */
1306 READ_BUF(4);
1307 dummy = be32_to_cpup(p++);
1308 READ_BUF(dummy * 4);
1309 p += dummy;
1310 break;
1311 case SP4_SSV:
1312 /* ssp_ops */
1313 READ_BUF(4);
1314 dummy = be32_to_cpup(p++);
1315 READ_BUF(dummy * 4);
1316 p += dummy;
1317
1318 READ_BUF(4);
1319 dummy = be32_to_cpup(p++);
1320 READ_BUF(dummy * 4);
1321 p += dummy;
1322
1323 /* ssp_hash_algs<> */
1324 READ_BUF(4);
1325 tmp = be32_to_cpup(p++);
1326 while (tmp--) {
1327 READ_BUF(4);
1328 dummy = be32_to_cpup(p++);
1329 READ_BUF(dummy);
1330 p += XDR_QUADLEN(dummy);
1331 }
1332
1333 /* ssp_encr_algs<> */
1334 READ_BUF(4);
1335 tmp = be32_to_cpup(p++);
1336 while (tmp--) {
1337 READ_BUF(4);
1338 dummy = be32_to_cpup(p++);
1339 READ_BUF(dummy);
1340 p += XDR_QUADLEN(dummy);
1341 }
1342
1343 /* ssp_window and ssp_num_gss_handles */
1344 READ_BUF(8);
1345 dummy = be32_to_cpup(p++);
1346 dummy = be32_to_cpup(p++);
1347 break;
1348 default:
1349 goto xdr_error;
1350 }
1351
1352 /* Ignore Implementation ID */
1353 READ_BUF(4); /* nfs_impl_id4 array length */
1354 dummy = be32_to_cpup(p++);
1355
1356 if (dummy > 1)
1357 goto xdr_error;
1358
1359 if (dummy == 1) {
1360 /* nii_domain */
1361 READ_BUF(4);
1362 dummy = be32_to_cpup(p++);
1363 READ_BUF(dummy);
1364 p += XDR_QUADLEN(dummy);
1365
1366 /* nii_name */
1367 READ_BUF(4);
1368 dummy = be32_to_cpup(p++);
1369 READ_BUF(dummy);
1370 p += XDR_QUADLEN(dummy);
1371
1372 /* nii_date */
1373 READ_BUF(12);
1374 p += 3;
1375 }
1376 DECODE_TAIL;
1377 }
1378
1379 static __be32
1380 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1381 struct nfsd4_create_session *sess)
1382 {
1383 DECODE_HEAD;
1384 u32 dummy;
1385
1386 READ_BUF(16);
1387 COPYMEM(&sess->clientid, 8);
1388 sess->seqid = be32_to_cpup(p++);
1389 sess->flags = be32_to_cpup(p++);
1390
1391 /* Fore channel attrs */
1392 READ_BUF(28);
1393 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1394 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1395 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1396 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1397 sess->fore_channel.maxops = be32_to_cpup(p++);
1398 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1399 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1400 if (sess->fore_channel.nr_rdma_attrs == 1) {
1401 READ_BUF(4);
1402 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1403 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1404 dprintk("Too many fore channel attr bitmaps!\n");
1405 goto xdr_error;
1406 }
1407
1408 /* Back channel attrs */
1409 READ_BUF(28);
1410 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1411 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1412 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1413 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1414 sess->back_channel.maxops = be32_to_cpup(p++);
1415 sess->back_channel.maxreqs = be32_to_cpup(p++);
1416 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1417 if (sess->back_channel.nr_rdma_attrs == 1) {
1418 READ_BUF(4);
1419 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1420 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1421 dprintk("Too many back channel attr bitmaps!\n");
1422 goto xdr_error;
1423 }
1424
1425 READ_BUF(4);
1426 sess->callback_prog = be32_to_cpup(p++);
1427 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1428 DECODE_TAIL;
1429 }
1430
1431 static __be32
1432 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1433 struct nfsd4_destroy_session *destroy_session)
1434 {
1435 DECODE_HEAD;
1436 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1437 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1438
1439 DECODE_TAIL;
1440 }
1441
1442 static __be32
1443 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1444 struct nfsd4_free_stateid *free_stateid)
1445 {
1446 DECODE_HEAD;
1447
1448 READ_BUF(sizeof(stateid_t));
1449 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1450 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1451
1452 DECODE_TAIL;
1453 }
1454
1455 static __be32
1456 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1457 struct nfsd4_sequence *seq)
1458 {
1459 DECODE_HEAD;
1460
1461 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1462 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1463 seq->seqid = be32_to_cpup(p++);
1464 seq->slotid = be32_to_cpup(p++);
1465 seq->maxslots = be32_to_cpup(p++);
1466 seq->cachethis = be32_to_cpup(p++);
1467
1468 DECODE_TAIL;
1469 }
1470
1471 static __be32
1472 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1473 {
1474 int i;
1475 __be32 *p, status;
1476 struct nfsd4_test_stateid_id *stateid;
1477
1478 READ_BUF(4);
1479 test_stateid->ts_num_ids = ntohl(*p++);
1480
1481 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1482
1483 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1484 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1485 if (!stateid) {
1486 status = nfserrno(-ENOMEM);
1487 goto out;
1488 }
1489
1490 INIT_LIST_HEAD(&stateid->ts_id_list);
1491 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1492
1493 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1494 if (status)
1495 goto out;
1496 }
1497
1498 status = 0;
1499 out:
1500 return status;
1501 xdr_error:
1502 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1503 status = nfserr_bad_xdr;
1504 goto out;
1505 }
1506
1507 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1508 {
1509 DECODE_HEAD;
1510
1511 READ_BUF(8);
1512 COPYMEM(&dc->clientid, 8);
1513
1514 DECODE_TAIL;
1515 }
1516
1517 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1518 {
1519 DECODE_HEAD;
1520
1521 READ_BUF(4);
1522 rc->rca_one_fs = be32_to_cpup(p++);
1523
1524 DECODE_TAIL;
1525 }
1526
1527 #ifdef CONFIG_NFSD_PNFS
1528 static __be32
1529 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1530 struct nfsd4_getdeviceinfo *gdev)
1531 {
1532 DECODE_HEAD;
1533 u32 num, i;
1534
1535 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1536 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1537 gdev->gd_layout_type = be32_to_cpup(p++);
1538 gdev->gd_maxcount = be32_to_cpup(p++);
1539 num = be32_to_cpup(p++);
1540 if (num) {
1541 READ_BUF(4 * num);
1542 gdev->gd_notify_types = be32_to_cpup(p++);
1543 for (i = 1; i < num; i++) {
1544 if (be32_to_cpup(p++)) {
1545 status = nfserr_inval;
1546 goto out;
1547 }
1548 }
1549 }
1550 DECODE_TAIL;
1551 }
1552
1553 static __be32
1554 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1555 struct nfsd4_layoutget *lgp)
1556 {
1557 DECODE_HEAD;
1558
1559 READ_BUF(36);
1560 lgp->lg_signal = be32_to_cpup(p++);
1561 lgp->lg_layout_type = be32_to_cpup(p++);
1562 lgp->lg_seg.iomode = be32_to_cpup(p++);
1563 p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1564 p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1565 p = xdr_decode_hyper(p, &lgp->lg_minlength);
1566
1567 status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1568 if (status)
1569 return status;
1570
1571 READ_BUF(4);
1572 lgp->lg_maxcount = be32_to_cpup(p++);
1573
1574 DECODE_TAIL;
1575 }
1576
1577 static __be32
1578 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1579 struct nfsd4_layoutcommit *lcp)
1580 {
1581 DECODE_HEAD;
1582 u32 timechange;
1583
1584 READ_BUF(20);
1585 p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1586 p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1587 lcp->lc_reclaim = be32_to_cpup(p++);
1588
1589 status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1590 if (status)
1591 return status;
1592
1593 READ_BUF(4);
1594 lcp->lc_newoffset = be32_to_cpup(p++);
1595 if (lcp->lc_newoffset) {
1596 READ_BUF(8);
1597 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1598 } else
1599 lcp->lc_last_wr = 0;
1600 READ_BUF(4);
1601 timechange = be32_to_cpup(p++);
1602 if (timechange) {
1603 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1604 if (status)
1605 return status;
1606 } else {
1607 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1608 }
1609 READ_BUF(8);
1610 lcp->lc_layout_type = be32_to_cpup(p++);
1611
1612 /*
1613 * Save the layout update in XDR format and let the layout driver deal
1614 * with it later.
1615 */
1616 lcp->lc_up_len = be32_to_cpup(p++);
1617 if (lcp->lc_up_len > 0) {
1618 READ_BUF(lcp->lc_up_len);
1619 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1620 }
1621
1622 DECODE_TAIL;
1623 }
1624
1625 static __be32
1626 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1627 struct nfsd4_layoutreturn *lrp)
1628 {
1629 DECODE_HEAD;
1630
1631 READ_BUF(16);
1632 lrp->lr_reclaim = be32_to_cpup(p++);
1633 lrp->lr_layout_type = be32_to_cpup(p++);
1634 lrp->lr_seg.iomode = be32_to_cpup(p++);
1635 lrp->lr_return_type = be32_to_cpup(p++);
1636 if (lrp->lr_return_type == RETURN_FILE) {
1637 READ_BUF(16);
1638 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1639 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1640
1641 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1642 if (status)
1643 return status;
1644
1645 READ_BUF(4);
1646 lrp->lrf_body_len = be32_to_cpup(p++);
1647 if (lrp->lrf_body_len > 0) {
1648 READ_BUF(lrp->lrf_body_len);
1649 READMEM(lrp->lrf_body, lrp->lrf_body_len);
1650 }
1651 } else {
1652 lrp->lr_seg.offset = 0;
1653 lrp->lr_seg.length = NFS4_MAX_UINT64;
1654 }
1655
1656 DECODE_TAIL;
1657 }
1658 #endif /* CONFIG_NFSD_PNFS */
1659
1660 static __be32
1661 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1662 struct nfsd4_fallocate *fallocate)
1663 {
1664 DECODE_HEAD;
1665
1666 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1667 if (status)
1668 return status;
1669
1670 READ_BUF(16);
1671 p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1672 xdr_decode_hyper(p, &fallocate->falloc_length);
1673
1674 DECODE_TAIL;
1675 }
1676
1677 static __be32
1678 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1679 {
1680 DECODE_HEAD;
1681
1682 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1683 if (status)
1684 return status;
1685 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1686 if (status)
1687 return status;
1688
1689 READ_BUF(8 + 8 + 8);
1690 p = xdr_decode_hyper(p, &clone->cl_src_pos);
1691 p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1692 p = xdr_decode_hyper(p, &clone->cl_count);
1693 DECODE_TAIL;
1694 }
1695
1696 static __be32
1697 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1698 {
1699 DECODE_HEAD;
1700
1701 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1702 if (status)
1703 return status;
1704
1705 READ_BUF(8 + 4);
1706 p = xdr_decode_hyper(p, &seek->seek_offset);
1707 seek->seek_whence = be32_to_cpup(p);
1708
1709 DECODE_TAIL;
1710 }
1711
1712 static __be32
1713 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1714 {
1715 return nfs_ok;
1716 }
1717
1718 static __be32
1719 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1720 {
1721 return nfserr_notsupp;
1722 }
1723
1724 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1725
1726 static nfsd4_dec nfsd4_dec_ops[] = {
1727 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1728 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1729 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1730 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1731 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1732 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1733 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1734 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1735 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1736 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1737 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1738 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1739 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1740 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1741 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1742 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1743 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1744 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1745 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1746 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1747 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1748 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1749 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1750 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1751 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1752 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1753 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1754 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1755 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1756 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1757 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1758 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1759 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1760 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1761 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1762 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1763 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1764
1765 /* new operations for NFSv4.1 */
1766 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1767 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1768 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1769 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1770 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1771 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1772 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1773 #ifdef CONFIG_NFSD_PNFS
1774 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1775 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1776 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit,
1777 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget,
1778 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn,
1779 #else
1780 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1781 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1782 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1783 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1784 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1785 #endif
1786 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1787 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1788 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1789 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1790 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1791 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1792 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1793
1794 /* new operations for NFSv4.2 */
1795 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1796 [OP_COPY] = (nfsd4_dec)nfsd4_decode_notsupp,
1797 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
1798 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1799 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
1800 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
1801 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
1802 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp,
1803 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1804 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1805 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
1806 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
1807 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone,
1808 };
1809
1810 static inline bool
1811 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1812 {
1813 if (op->opnum < FIRST_NFS4_OP)
1814 return false;
1815 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1816 return false;
1817 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1818 return false;
1819 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1820 return false;
1821 return true;
1822 }
1823
1824 static __be32
1825 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1826 {
1827 DECODE_HEAD;
1828 struct nfsd4_op *op;
1829 bool cachethis = false;
1830 int auth_slack= argp->rqstp->rq_auth_slack;
1831 int max_reply = auth_slack + 8; /* opcnt, status */
1832 int readcount = 0;
1833 int readbytes = 0;
1834 int i;
1835
1836 READ_BUF(4);
1837 argp->taglen = be32_to_cpup(p++);
1838 READ_BUF(argp->taglen + 8);
1839 SAVEMEM(argp->tag, argp->taglen);
1840 argp->minorversion = be32_to_cpup(p++);
1841 argp->opcnt = be32_to_cpup(p++);
1842 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1843
1844 if (argp->taglen > NFSD4_MAX_TAGLEN)
1845 goto xdr_error;
1846 if (argp->opcnt > 100)
1847 goto xdr_error;
1848
1849 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1850 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1851 if (!argp->ops) {
1852 argp->ops = argp->iops;
1853 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1854 goto xdr_error;
1855 }
1856 }
1857
1858 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1859 argp->opcnt = 0;
1860
1861 for (i = 0; i < argp->opcnt; i++) {
1862 op = &argp->ops[i];
1863 op->replay = NULL;
1864
1865 READ_BUF(4);
1866 op->opnum = be32_to_cpup(p++);
1867
1868 if (nfsd4_opnum_in_range(argp, op))
1869 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1870 else {
1871 op->opnum = OP_ILLEGAL;
1872 op->status = nfserr_op_illegal;
1873 }
1874 /*
1875 * We'll try to cache the result in the DRC if any one
1876 * op in the compound wants to be cached:
1877 */
1878 cachethis |= nfsd4_cache_this_op(op);
1879
1880 if (op->opnum == OP_READ) {
1881 readcount++;
1882 readbytes += nfsd4_max_reply(argp->rqstp, op);
1883 } else
1884 max_reply += nfsd4_max_reply(argp->rqstp, op);
1885 /*
1886 * OP_LOCK may return a conflicting lock. (Special case
1887 * because it will just skip encoding this if it runs
1888 * out of xdr buffer space, and it is the only operation
1889 * that behaves this way.)
1890 */
1891 if (op->opnum == OP_LOCK)
1892 max_reply += NFS4_OPAQUE_LIMIT;
1893
1894 if (op->status) {
1895 argp->opcnt = i+1;
1896 break;
1897 }
1898 }
1899 /* Sessions make the DRC unnecessary: */
1900 if (argp->minorversion)
1901 cachethis = false;
1902 svc_reserve(argp->rqstp, max_reply + readbytes);
1903 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1904
1905 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1906 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1907
1908 DECODE_TAIL;
1909 }
1910
1911 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1912 {
1913 if (IS_I_VERSION(inode)) {
1914 p = xdr_encode_hyper(p, inode->i_version);
1915 } else {
1916 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1917 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1918 }
1919 return p;
1920 }
1921
1922 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1923 {
1924 *p++ = cpu_to_be32(c->atomic);
1925 if (c->change_supported) {
1926 p = xdr_encode_hyper(p, c->before_change);
1927 p = xdr_encode_hyper(p, c->after_change);
1928 } else {
1929 *p++ = cpu_to_be32(c->before_ctime_sec);
1930 *p++ = cpu_to_be32(c->before_ctime_nsec);
1931 *p++ = cpu_to_be32(c->after_ctime_sec);
1932 *p++ = cpu_to_be32(c->after_ctime_nsec);
1933 }
1934 return p;
1935 }
1936
1937 /* Encode as an array of strings the string given with components
1938 * separated @sep, escaped with esc_enter and esc_exit.
1939 */
1940 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1941 char *components, char esc_enter,
1942 char esc_exit)
1943 {
1944 __be32 *p;
1945 __be32 pathlen;
1946 int pathlen_offset;
1947 int strlen, count=0;
1948 char *str, *end, *next;
1949
1950 dprintk("nfsd4_encode_components(%s)\n", components);
1951
1952 pathlen_offset = xdr->buf->len;
1953 p = xdr_reserve_space(xdr, 4);
1954 if (!p)
1955 return nfserr_resource;
1956 p++; /* We will fill this in with @count later */
1957
1958 end = str = components;
1959 while (*end) {
1960 bool found_esc = false;
1961
1962 /* try to parse as esc_start, ..., esc_end, sep */
1963 if (*str == esc_enter) {
1964 for (; *end && (*end != esc_exit); end++)
1965 /* find esc_exit or end of string */;
1966 next = end + 1;
1967 if (*end && (!*next || *next == sep)) {
1968 str++;
1969 found_esc = true;
1970 }
1971 }
1972
1973 if (!found_esc)
1974 for (; *end && (*end != sep); end++)
1975 /* find sep or end of string */;
1976
1977 strlen = end - str;
1978 if (strlen) {
1979 p = xdr_reserve_space(xdr, strlen + 4);
1980 if (!p)
1981 return nfserr_resource;
1982 p = xdr_encode_opaque(p, str, strlen);
1983 count++;
1984 }
1985 else
1986 end++;
1987 if (found_esc)
1988 end = next;
1989
1990 str = end;
1991 }
1992 pathlen = htonl(count);
1993 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1994 return 0;
1995 }
1996
1997 /* Encode as an array of strings the string given with components
1998 * separated @sep.
1999 */
2000 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2001 char *components)
2002 {
2003 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2004 }
2005
2006 /*
2007 * encode a location element of a fs_locations structure
2008 */
2009 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2010 struct nfsd4_fs_location *location)
2011 {
2012 __be32 status;
2013
2014 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2015 '[', ']');
2016 if (status)
2017 return status;
2018 status = nfsd4_encode_components(xdr, '/', location->path);
2019 if (status)
2020 return status;
2021 return 0;
2022 }
2023
2024 /*
2025 * Encode a path in RFC3530 'pathname4' format
2026 */
2027 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2028 const struct path *root,
2029 const struct path *path)
2030 {
2031 struct path cur = *path;
2032 __be32 *p;
2033 struct dentry **components = NULL;
2034 unsigned int ncomponents = 0;
2035 __be32 err = nfserr_jukebox;
2036
2037 dprintk("nfsd4_encode_components(");
2038
2039 path_get(&cur);
2040 /* First walk the path up to the nfsd root, and store the
2041 * dentries/path components in an array.
2042 */
2043 for (;;) {
2044 if (path_equal(&cur, root))
2045 break;
2046 if (cur.dentry == cur.mnt->mnt_root) {
2047 if (follow_up(&cur))
2048 continue;
2049 goto out_free;
2050 }
2051 if ((ncomponents & 15) == 0) {
2052 struct dentry **new;
2053 new = krealloc(components,
2054 sizeof(*new) * (ncomponents + 16),
2055 GFP_KERNEL);
2056 if (!new)
2057 goto out_free;
2058 components = new;
2059 }
2060 components[ncomponents++] = cur.dentry;
2061 cur.dentry = dget_parent(cur.dentry);
2062 }
2063 err = nfserr_resource;
2064 p = xdr_reserve_space(xdr, 4);
2065 if (!p)
2066 goto out_free;
2067 *p++ = cpu_to_be32(ncomponents);
2068
2069 while (ncomponents) {
2070 struct dentry *dentry = components[ncomponents - 1];
2071 unsigned int len;
2072
2073 spin_lock(&dentry->d_lock);
2074 len = dentry->d_name.len;
2075 p = xdr_reserve_space(xdr, len + 4);
2076 if (!p) {
2077 spin_unlock(&dentry->d_lock);
2078 goto out_free;
2079 }
2080 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2081 dprintk("/%pd", dentry);
2082 spin_unlock(&dentry->d_lock);
2083 dput(dentry);
2084 ncomponents--;
2085 }
2086
2087 err = 0;
2088 out_free:
2089 dprintk(")\n");
2090 while (ncomponents)
2091 dput(components[--ncomponents]);
2092 kfree(components);
2093 path_put(&cur);
2094 return err;
2095 }
2096
2097 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2098 struct svc_rqst *rqstp, const struct path *path)
2099 {
2100 struct svc_export *exp_ps;
2101 __be32 res;
2102
2103 exp_ps = rqst_find_fsidzero_export(rqstp);
2104 if (IS_ERR(exp_ps))
2105 return nfserrno(PTR_ERR(exp_ps));
2106 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2107 exp_put(exp_ps);
2108 return res;
2109 }
2110
2111 /*
2112 * encode a fs_locations structure
2113 */
2114 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2115 struct svc_rqst *rqstp, struct svc_export *exp)
2116 {
2117 __be32 status;
2118 int i;
2119 __be32 *p;
2120 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2121
2122 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2123 if (status)
2124 return status;
2125 p = xdr_reserve_space(xdr, 4);
2126 if (!p)
2127 return nfserr_resource;
2128 *p++ = cpu_to_be32(fslocs->locations_count);
2129 for (i=0; i<fslocs->locations_count; i++) {
2130 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2131 if (status)
2132 return status;
2133 }
2134 return 0;
2135 }
2136
2137 static u32 nfs4_file_type(umode_t mode)
2138 {
2139 switch (mode & S_IFMT) {
2140 case S_IFIFO: return NF4FIFO;
2141 case S_IFCHR: return NF4CHR;
2142 case S_IFDIR: return NF4DIR;
2143 case S_IFBLK: return NF4BLK;
2144 case S_IFLNK: return NF4LNK;
2145 case S_IFREG: return NF4REG;
2146 case S_IFSOCK: return NF4SOCK;
2147 default: return NF4BAD;
2148 };
2149 }
2150
2151 static inline __be32
2152 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2153 struct nfs4_ace *ace)
2154 {
2155 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2156 return nfs4_acl_write_who(xdr, ace->whotype);
2157 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2158 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2159 else
2160 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2161 }
2162
2163 static inline __be32
2164 nfsd4_encode_layout_type(struct xdr_stream *xdr, enum pnfs_layouttype layout_type)
2165 {
2166 __be32 *p;
2167
2168 if (layout_type) {
2169 p = xdr_reserve_space(xdr, 8);
2170 if (!p)
2171 return nfserr_resource;
2172 *p++ = cpu_to_be32(1);
2173 *p++ = cpu_to_be32(layout_type);
2174 } else {
2175 p = xdr_reserve_space(xdr, 4);
2176 if (!p)
2177 return nfserr_resource;
2178 *p++ = cpu_to_be32(0);
2179 }
2180
2181 return 0;
2182 }
2183
2184 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2185 FATTR4_WORD0_RDATTR_ERROR)
2186 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2187 #define WORD2_ABSENT_FS_ATTRS 0
2188
2189 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2190 static inline __be32
2191 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2192 void *context, int len)
2193 {
2194 __be32 *p;
2195
2196 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2197 if (!p)
2198 return nfserr_resource;
2199
2200 /*
2201 * For now we use a 0 here to indicate the null translation; in
2202 * the future we may place a call to translation code here.
2203 */
2204 *p++ = cpu_to_be32(0); /* lfs */
2205 *p++ = cpu_to_be32(0); /* pi */
2206 p = xdr_encode_opaque(p, context, len);
2207 return 0;
2208 }
2209 #else
2210 static inline __be32
2211 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2212 void *context, int len)
2213 { return 0; }
2214 #endif
2215
2216 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2217 {
2218 /* As per referral draft: */
2219 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2220 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2221 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2222 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2223 *rdattr_err = NFSERR_MOVED;
2224 else
2225 return nfserr_moved;
2226 }
2227 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2228 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2229 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2230 return 0;
2231 }
2232
2233
2234 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2235 {
2236 struct path path = exp->ex_path;
2237 int err;
2238
2239 path_get(&path);
2240 while (follow_up(&path)) {
2241 if (path.dentry != path.mnt->mnt_root)
2242 break;
2243 }
2244 err = vfs_getattr(&path, stat);
2245 path_put(&path);
2246 return err;
2247 }
2248
2249 static __be32
2250 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2251 {
2252 __be32 *p;
2253
2254 if (bmval2) {
2255 p = xdr_reserve_space(xdr, 16);
2256 if (!p)
2257 goto out_resource;
2258 *p++ = cpu_to_be32(3);
2259 *p++ = cpu_to_be32(bmval0);
2260 *p++ = cpu_to_be32(bmval1);
2261 *p++ = cpu_to_be32(bmval2);
2262 } else if (bmval1) {
2263 p = xdr_reserve_space(xdr, 12);
2264 if (!p)
2265 goto out_resource;
2266 *p++ = cpu_to_be32(2);
2267 *p++ = cpu_to_be32(bmval0);
2268 *p++ = cpu_to_be32(bmval1);
2269 } else {
2270 p = xdr_reserve_space(xdr, 8);
2271 if (!p)
2272 goto out_resource;
2273 *p++ = cpu_to_be32(1);
2274 *p++ = cpu_to_be32(bmval0);
2275 }
2276
2277 return 0;
2278 out_resource:
2279 return nfserr_resource;
2280 }
2281
2282 /*
2283 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2284 * ourselves.
2285 */
2286 static __be32
2287 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2288 struct svc_export *exp,
2289 struct dentry *dentry, u32 *bmval,
2290 struct svc_rqst *rqstp, int ignore_crossmnt)
2291 {
2292 u32 bmval0 = bmval[0];
2293 u32 bmval1 = bmval[1];
2294 u32 bmval2 = bmval[2];
2295 struct kstat stat;
2296 struct svc_fh *tempfh = NULL;
2297 struct kstatfs statfs;
2298 __be32 *p;
2299 int starting_len = xdr->buf->len;
2300 int attrlen_offset;
2301 __be32 attrlen;
2302 u32 dummy;
2303 u64 dummy64;
2304 u32 rdattr_err = 0;
2305 __be32 status;
2306 int err;
2307 struct nfs4_acl *acl = NULL;
2308 void *context = NULL;
2309 int contextlen;
2310 bool contextsupport = false;
2311 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2312 u32 minorversion = resp->cstate.minorversion;
2313 struct path path = {
2314 .mnt = exp->ex_path.mnt,
2315 .dentry = dentry,
2316 };
2317 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2318
2319 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2320 BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2321 BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2322 BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2323
2324 if (exp->ex_fslocs.migrated) {
2325 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2326 if (status)
2327 goto out;
2328 }
2329
2330 err = vfs_getattr(&path, &stat);
2331 if (err)
2332 goto out_nfserr;
2333 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2334 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2335 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2336 FATTR4_WORD1_SPACE_TOTAL))) {
2337 err = vfs_statfs(&path, &statfs);
2338 if (err)
2339 goto out_nfserr;
2340 }
2341 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2342 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2343 status = nfserr_jukebox;
2344 if (!tempfh)
2345 goto out;
2346 fh_init(tempfh, NFS4_FHSIZE);
2347 status = fh_compose(tempfh, exp, dentry, NULL);
2348 if (status)
2349 goto out;
2350 fhp = tempfh;
2351 }
2352 if (bmval0 & FATTR4_WORD0_ACL) {
2353 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2354 if (err == -EOPNOTSUPP)
2355 bmval0 &= ~FATTR4_WORD0_ACL;
2356 else if (err == -EINVAL) {
2357 status = nfserr_attrnotsupp;
2358 goto out;
2359 } else if (err != 0)
2360 goto out_nfserr;
2361 }
2362
2363 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2364 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2365 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2366 err = security_inode_getsecctx(d_inode(dentry),
2367 &context, &contextlen);
2368 contextsupport = (err == 0);
2369 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2370 if (err == -EOPNOTSUPP)
2371 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2372 else if (err)
2373 goto out_nfserr;
2374 }
2375 }
2376 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2377
2378 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2379 if (status)
2380 goto out;
2381
2382 attrlen_offset = xdr->buf->len;
2383 p = xdr_reserve_space(xdr, 4);
2384 if (!p)
2385 goto out_resource;
2386 p++; /* to be backfilled later */
2387
2388 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2389 u32 word0 = nfsd_suppattrs0(minorversion);
2390 u32 word1 = nfsd_suppattrs1(minorversion);
2391 u32 word2 = nfsd_suppattrs2(minorversion);
2392
2393 if (!IS_POSIXACL(dentry->d_inode))
2394 word0 &= ~FATTR4_WORD0_ACL;
2395 if (!contextsupport)
2396 word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2397 if (!word2) {
2398 p = xdr_reserve_space(xdr, 12);
2399 if (!p)
2400 goto out_resource;
2401 *p++ = cpu_to_be32(2);
2402 *p++ = cpu_to_be32(word0);
2403 *p++ = cpu_to_be32(word1);
2404 } else {
2405 p = xdr_reserve_space(xdr, 16);
2406 if (!p)
2407 goto out_resource;
2408 *p++ = cpu_to_be32(3);
2409 *p++ = cpu_to_be32(word0);
2410 *p++ = cpu_to_be32(word1);
2411 *p++ = cpu_to_be32(word2);
2412 }
2413 }
2414 if (bmval0 & FATTR4_WORD0_TYPE) {
2415 p = xdr_reserve_space(xdr, 4);
2416 if (!p)
2417 goto out_resource;
2418 dummy = nfs4_file_type(stat.mode);
2419 if (dummy == NF4BAD) {
2420 status = nfserr_serverfault;
2421 goto out;
2422 }
2423 *p++ = cpu_to_be32(dummy);
2424 }
2425 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2426 p = xdr_reserve_space(xdr, 4);
2427 if (!p)
2428 goto out_resource;
2429 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2430 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2431 else
2432 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2433 NFS4_FH_VOL_RENAME);
2434 }
2435 if (bmval0 & FATTR4_WORD0_CHANGE) {
2436 p = xdr_reserve_space(xdr, 8);
2437 if (!p)
2438 goto out_resource;
2439 p = encode_change(p, &stat, d_inode(dentry));
2440 }
2441 if (bmval0 & FATTR4_WORD0_SIZE) {
2442 p = xdr_reserve_space(xdr, 8);
2443 if (!p)
2444 goto out_resource;
2445 p = xdr_encode_hyper(p, stat.size);
2446 }
2447 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2448 p = xdr_reserve_space(xdr, 4);
2449 if (!p)
2450 goto out_resource;
2451 *p++ = cpu_to_be32(1);
2452 }
2453 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2454 p = xdr_reserve_space(xdr, 4);
2455 if (!p)
2456 goto out_resource;
2457 *p++ = cpu_to_be32(1);
2458 }
2459 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2460 p = xdr_reserve_space(xdr, 4);
2461 if (!p)
2462 goto out_resource;
2463 *p++ = cpu_to_be32(0);
2464 }
2465 if (bmval0 & FATTR4_WORD0_FSID) {
2466 p = xdr_reserve_space(xdr, 16);
2467 if (!p)
2468 goto out_resource;
2469 if (exp->ex_fslocs.migrated) {
2470 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2471 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2472 } else switch(fsid_source(fhp)) {
2473 case FSIDSOURCE_FSID:
2474 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2475 p = xdr_encode_hyper(p, (u64)0);
2476 break;
2477 case FSIDSOURCE_DEV:
2478 *p++ = cpu_to_be32(0);
2479 *p++ = cpu_to_be32(MAJOR(stat.dev));
2480 *p++ = cpu_to_be32(0);
2481 *p++ = cpu_to_be32(MINOR(stat.dev));
2482 break;
2483 case FSIDSOURCE_UUID:
2484 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2485 EX_UUID_LEN);
2486 break;
2487 }
2488 }
2489 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2490 p = xdr_reserve_space(xdr, 4);
2491 if (!p)
2492 goto out_resource;
2493 *p++ = cpu_to_be32(0);
2494 }
2495 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2496 p = xdr_reserve_space(xdr, 4);
2497 if (!p)
2498 goto out_resource;
2499 *p++ = cpu_to_be32(nn->nfsd4_lease);
2500 }
2501 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2502 p = xdr_reserve_space(xdr, 4);
2503 if (!p)
2504 goto out_resource;
2505 *p++ = cpu_to_be32(rdattr_err);
2506 }
2507 if (bmval0 & FATTR4_WORD0_ACL) {
2508 struct nfs4_ace *ace;
2509
2510 if (acl == NULL) {
2511 p = xdr_reserve_space(xdr, 4);
2512 if (!p)
2513 goto out_resource;
2514
2515 *p++ = cpu_to_be32(0);
2516 goto out_acl;
2517 }
2518 p = xdr_reserve_space(xdr, 4);
2519 if (!p)
2520 goto out_resource;
2521 *p++ = cpu_to_be32(acl->naces);
2522
2523 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2524 p = xdr_reserve_space(xdr, 4*3);
2525 if (!p)
2526 goto out_resource;
2527 *p++ = cpu_to_be32(ace->type);
2528 *p++ = cpu_to_be32(ace->flag);
2529 *p++ = cpu_to_be32(ace->access_mask &
2530 NFS4_ACE_MASK_ALL);
2531 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2532 if (status)
2533 goto out;
2534 }
2535 }
2536 out_acl:
2537 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2538 p = xdr_reserve_space(xdr, 4);
2539 if (!p)
2540 goto out_resource;
2541 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2542 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2543 }
2544 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2545 p = xdr_reserve_space(xdr, 4);
2546 if (!p)
2547 goto out_resource;
2548 *p++ = cpu_to_be32(1);
2549 }
2550 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2551 p = xdr_reserve_space(xdr, 4);
2552 if (!p)
2553 goto out_resource;
2554 *p++ = cpu_to_be32(0);
2555 }
2556 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2557 p = xdr_reserve_space(xdr, 4);
2558 if (!p)
2559 goto out_resource;
2560 *p++ = cpu_to_be32(1);
2561 }
2562 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2563 p = xdr_reserve_space(xdr, 4);
2564 if (!p)
2565 goto out_resource;
2566 *p++ = cpu_to_be32(1);
2567 }
2568 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2569 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2570 if (!p)
2571 goto out_resource;
2572 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2573 fhp->fh_handle.fh_size);
2574 }
2575 if (bmval0 & FATTR4_WORD0_FILEID) {
2576 p = xdr_reserve_space(xdr, 8);
2577 if (!p)
2578 goto out_resource;
2579 p = xdr_encode_hyper(p, stat.ino);
2580 }
2581 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2582 p = xdr_reserve_space(xdr, 8);
2583 if (!p)
2584 goto out_resource;
2585 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2586 }
2587 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2588 p = xdr_reserve_space(xdr, 8);
2589 if (!p)
2590 goto out_resource;
2591 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2592 }
2593 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2594 p = xdr_reserve_space(xdr, 8);
2595 if (!p)
2596 goto out_resource;
2597 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2598 }
2599 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2600 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2601 if (status)
2602 goto out;
2603 }
2604 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2605 p = xdr_reserve_space(xdr, 4);
2606 if (!p)
2607 goto out_resource;
2608 *p++ = cpu_to_be32(1);
2609 }
2610 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2611 p = xdr_reserve_space(xdr, 8);
2612 if (!p)
2613 goto out_resource;
2614 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2615 }
2616 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2617 p = xdr_reserve_space(xdr, 4);
2618 if (!p)
2619 goto out_resource;
2620 *p++ = cpu_to_be32(255);
2621 }
2622 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2623 p = xdr_reserve_space(xdr, 4);
2624 if (!p)
2625 goto out_resource;
2626 *p++ = cpu_to_be32(statfs.f_namelen);
2627 }
2628 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2629 p = xdr_reserve_space(xdr, 8);
2630 if (!p)
2631 goto out_resource;
2632 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2633 }
2634 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2635 p = xdr_reserve_space(xdr, 8);
2636 if (!p)
2637 goto out_resource;
2638 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2639 }
2640 if (bmval1 & FATTR4_WORD1_MODE) {
2641 p = xdr_reserve_space(xdr, 4);
2642 if (!p)
2643 goto out_resource;
2644 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2645 }
2646 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2647 p = xdr_reserve_space(xdr, 4);
2648 if (!p)
2649 goto out_resource;
2650 *p++ = cpu_to_be32(1);
2651 }
2652 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2653 p = xdr_reserve_space(xdr, 4);
2654 if (!p)
2655 goto out_resource;
2656 *p++ = cpu_to_be32(stat.nlink);
2657 }
2658 if (bmval1 & FATTR4_WORD1_OWNER) {
2659 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2660 if (status)
2661 goto out;
2662 }
2663 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2664 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2665 if (status)
2666 goto out;
2667 }
2668 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2669 p = xdr_reserve_space(xdr, 8);
2670 if (!p)
2671 goto out_resource;
2672 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2673 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2674 }
2675 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2676 p = xdr_reserve_space(xdr, 8);
2677 if (!p)
2678 goto out_resource;
2679 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2680 p = xdr_encode_hyper(p, dummy64);
2681 }
2682 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2683 p = xdr_reserve_space(xdr, 8);
2684 if (!p)
2685 goto out_resource;
2686 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2687 p = xdr_encode_hyper(p, dummy64);
2688 }
2689 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2690 p = xdr_reserve_space(xdr, 8);
2691 if (!p)
2692 goto out_resource;
2693 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2694 p = xdr_encode_hyper(p, dummy64);
2695 }
2696 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2697 p = xdr_reserve_space(xdr, 8);
2698 if (!p)
2699 goto out_resource;
2700 dummy64 = (u64)stat.blocks << 9;
2701 p = xdr_encode_hyper(p, dummy64);
2702 }
2703 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2704 p = xdr_reserve_space(xdr, 12);
2705 if (!p)
2706 goto out_resource;
2707 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2708 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2709 }
2710 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2711 p = xdr_reserve_space(xdr, 12);
2712 if (!p)
2713 goto out_resource;
2714 *p++ = cpu_to_be32(0);
2715 *p++ = cpu_to_be32(1);
2716 *p++ = cpu_to_be32(0);
2717 }
2718 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2719 p = xdr_reserve_space(xdr, 12);
2720 if (!p)
2721 goto out_resource;
2722 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2723 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2724 }
2725 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2726 p = xdr_reserve_space(xdr, 12);
2727 if (!p)
2728 goto out_resource;
2729 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2730 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2731 }
2732 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2733 struct kstat parent_stat;
2734 u64 ino = stat.ino;
2735
2736 p = xdr_reserve_space(xdr, 8);
2737 if (!p)
2738 goto out_resource;
2739 /*
2740 * Get parent's attributes if not ignoring crossmount
2741 * and this is the root of a cross-mounted filesystem.
2742 */
2743 if (ignore_crossmnt == 0 &&
2744 dentry == exp->ex_path.mnt->mnt_root) {
2745 err = get_parent_attributes(exp, &parent_stat);
2746 if (err)
2747 goto out_nfserr;
2748 ino = parent_stat.ino;
2749 }
2750 p = xdr_encode_hyper(p, ino);
2751 }
2752 #ifdef CONFIG_NFSD_PNFS
2753 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2754 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2755 if (status)
2756 goto out;
2757 }
2758
2759 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2760 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2761 if (status)
2762 goto out;
2763 }
2764
2765 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2766 p = xdr_reserve_space(xdr, 4);
2767 if (!p)
2768 goto out_resource;
2769 *p++ = cpu_to_be32(stat.blksize);
2770 }
2771 #endif /* CONFIG_NFSD_PNFS */
2772 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2773 status = nfsd4_encode_bitmap(xdr, NFSD_SUPPATTR_EXCLCREAT_WORD0,
2774 NFSD_SUPPATTR_EXCLCREAT_WORD1,
2775 NFSD_SUPPATTR_EXCLCREAT_WORD2);
2776 if (status)
2777 goto out;
2778 }
2779
2780 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2781 status = nfsd4_encode_security_label(xdr, rqstp, context,
2782 contextlen);
2783 if (status)
2784 goto out;
2785 }
2786
2787 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2788 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2789 status = nfs_ok;
2790
2791 out:
2792 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2793 if (context)
2794 security_release_secctx(context, contextlen);
2795 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2796 kfree(acl);
2797 if (tempfh) {
2798 fh_put(tempfh);
2799 kfree(tempfh);
2800 }
2801 if (status)
2802 xdr_truncate_encode(xdr, starting_len);
2803 return status;
2804 out_nfserr:
2805 status = nfserrno(err);
2806 goto out;
2807 out_resource:
2808 status = nfserr_resource;
2809 goto out;
2810 }
2811
2812 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2813 struct xdr_buf *buf, __be32 *p, int bytes)
2814 {
2815 xdr->scratch.iov_len = 0;
2816 memset(buf, 0, sizeof(struct xdr_buf));
2817 buf->head[0].iov_base = p;
2818 buf->head[0].iov_len = 0;
2819 buf->len = 0;
2820 xdr->buf = buf;
2821 xdr->iov = buf->head;
2822 xdr->p = p;
2823 xdr->end = (void *)p + bytes;
2824 buf->buflen = bytes;
2825 }
2826
2827 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2828 struct svc_fh *fhp, struct svc_export *exp,
2829 struct dentry *dentry, u32 *bmval,
2830 struct svc_rqst *rqstp, int ignore_crossmnt)
2831 {
2832 struct xdr_buf dummy;
2833 struct xdr_stream xdr;
2834 __be32 ret;
2835
2836 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2837 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2838 ignore_crossmnt);
2839 *p = xdr.p;
2840 return ret;
2841 }
2842
2843 static inline int attributes_need_mount(u32 *bmval)
2844 {
2845 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2846 return 1;
2847 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2848 return 1;
2849 return 0;
2850 }
2851
2852 static __be32
2853 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2854 const char *name, int namlen)
2855 {
2856 struct svc_export *exp = cd->rd_fhp->fh_export;
2857 struct dentry *dentry;
2858 __be32 nfserr;
2859 int ignore_crossmnt = 0;
2860
2861 dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2862 if (IS_ERR(dentry))
2863 return nfserrno(PTR_ERR(dentry));
2864 if (d_really_is_negative(dentry)) {
2865 /*
2866 * we're not holding the i_mutex here, so there's
2867 * a window where this directory entry could have gone
2868 * away.
2869 */
2870 dput(dentry);
2871 return nfserr_noent;
2872 }
2873
2874 exp_get(exp);
2875 /*
2876 * In the case of a mountpoint, the client may be asking for
2877 * attributes that are only properties of the underlying filesystem
2878 * as opposed to the cross-mounted file system. In such a case,
2879 * we will not follow the cross mount and will fill the attribtutes
2880 * directly from the mountpoint dentry.
2881 */
2882 if (nfsd_mountpoint(dentry, exp)) {
2883 int err;
2884
2885 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2886 && !attributes_need_mount(cd->rd_bmval)) {
2887 ignore_crossmnt = 1;
2888 goto out_encode;
2889 }
2890 /*
2891 * Why the heck aren't we just using nfsd_lookup??
2892 * Different "."/".." handling? Something else?
2893 * At least, add a comment here to explain....
2894 */
2895 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2896 if (err) {
2897 nfserr = nfserrno(err);
2898 goto out_put;
2899 }
2900 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2901 if (nfserr)
2902 goto out_put;
2903
2904 }
2905 out_encode:
2906 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2907 cd->rd_rqstp, ignore_crossmnt);
2908 out_put:
2909 dput(dentry);
2910 exp_put(exp);
2911 return nfserr;
2912 }
2913
2914 static __be32 *
2915 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2916 {
2917 __be32 *p;
2918
2919 p = xdr_reserve_space(xdr, 20);
2920 if (!p)
2921 return NULL;
2922 *p++ = htonl(2);
2923 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2924 *p++ = htonl(0); /* bmval1 */
2925
2926 *p++ = htonl(4); /* attribute length */
2927 *p++ = nfserr; /* no htonl */
2928 return p;
2929 }
2930
2931 static int
2932 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2933 loff_t offset, u64 ino, unsigned int d_type)
2934 {
2935 struct readdir_cd *ccd = ccdv;
2936 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2937 struct xdr_stream *xdr = cd->xdr;
2938 int start_offset = xdr->buf->len;
2939 int cookie_offset;
2940 u32 name_and_cookie;
2941 int entry_bytes;
2942 __be32 nfserr = nfserr_toosmall;
2943 __be64 wire_offset;
2944 __be32 *p;
2945
2946 /* In nfsv4, "." and ".." never make it onto the wire.. */
2947 if (name && isdotent(name, namlen)) {
2948 cd->common.err = nfs_ok;
2949 return 0;
2950 }
2951
2952 if (cd->cookie_offset) {
2953 wire_offset = cpu_to_be64(offset);
2954 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2955 &wire_offset, 8);
2956 }
2957
2958 p = xdr_reserve_space(xdr, 4);
2959 if (!p)
2960 goto fail;
2961 *p++ = xdr_one; /* mark entry present */
2962 cookie_offset = xdr->buf->len;
2963 p = xdr_reserve_space(xdr, 3*4 + namlen);
2964 if (!p)
2965 goto fail;
2966 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
2967 p = xdr_encode_array(p, name, namlen); /* name length & name */
2968
2969 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2970 switch (nfserr) {
2971 case nfs_ok:
2972 break;
2973 case nfserr_resource:
2974 nfserr = nfserr_toosmall;
2975 goto fail;
2976 case nfserr_noent:
2977 xdr_truncate_encode(xdr, start_offset);
2978 goto skip_entry;
2979 default:
2980 /*
2981 * If the client requested the RDATTR_ERROR attribute,
2982 * we stuff the error code into this attribute
2983 * and continue. If this attribute was not requested,
2984 * then in accordance with the spec, we fail the
2985 * entire READDIR operation(!)
2986 */
2987 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2988 goto fail;
2989 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2990 if (p == NULL) {
2991 nfserr = nfserr_toosmall;
2992 goto fail;
2993 }
2994 }
2995 nfserr = nfserr_toosmall;
2996 entry_bytes = xdr->buf->len - start_offset;
2997 if (entry_bytes > cd->rd_maxcount)
2998 goto fail;
2999 cd->rd_maxcount -= entry_bytes;
3000 /*
3001 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3002 * let's always let through the first entry, at least:
3003 */
3004 if (!cd->rd_dircount)
3005 goto fail;
3006 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3007 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3008 goto fail;
3009 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3010
3011 cd->cookie_offset = cookie_offset;
3012 skip_entry:
3013 cd->common.err = nfs_ok;
3014 return 0;
3015 fail:
3016 xdr_truncate_encode(xdr, start_offset);
3017 cd->common.err = nfserr;
3018 return -EINVAL;
3019 }
3020
3021 static __be32
3022 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3023 {
3024 __be32 *p;
3025
3026 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3027 if (!p)
3028 return nfserr_resource;
3029 *p++ = cpu_to_be32(sid->si_generation);
3030 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3031 sizeof(stateid_opaque_t));
3032 return 0;
3033 }
3034
3035 static __be32
3036 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3037 {
3038 struct xdr_stream *xdr = &resp->xdr;
3039 __be32 *p;
3040
3041 if (!nfserr) {
3042 p = xdr_reserve_space(xdr, 8);
3043 if (!p)
3044 return nfserr_resource;
3045 *p++ = cpu_to_be32(access->ac_supported);
3046 *p++ = cpu_to_be32(access->ac_resp_access);
3047 }
3048 return nfserr;
3049 }
3050
3051 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3052 {
3053 struct xdr_stream *xdr = &resp->xdr;
3054 __be32 *p;
3055
3056 if (!nfserr) {
3057 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3058 if (!p)
3059 return nfserr_resource;
3060 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3061 NFS4_MAX_SESSIONID_LEN);
3062 *p++ = cpu_to_be32(bcts->dir);
3063 /* Sorry, we do not yet support RDMA over 4.1: */
3064 *p++ = cpu_to_be32(0);
3065 }
3066 return nfserr;
3067 }
3068
3069 static __be32
3070 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3071 {
3072 struct xdr_stream *xdr = &resp->xdr;
3073
3074 if (!nfserr)
3075 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3076
3077 return nfserr;
3078 }
3079
3080
3081 static __be32
3082 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3083 {
3084 struct xdr_stream *xdr = &resp->xdr;
3085 __be32 *p;
3086
3087 if (!nfserr) {
3088 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3089 if (!p)
3090 return nfserr_resource;
3091 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3092 NFS4_VERIFIER_SIZE);
3093 }
3094 return nfserr;
3095 }
3096
3097 static __be32
3098 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3099 {
3100 struct xdr_stream *xdr = &resp->xdr;
3101 __be32 *p;
3102
3103 if (!nfserr) {
3104 p = xdr_reserve_space(xdr, 20);
3105 if (!p)
3106 return nfserr_resource;
3107 encode_cinfo(p, &create->cr_cinfo);
3108 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3109 create->cr_bmval[1], create->cr_bmval[2]);
3110 }
3111 return nfserr;
3112 }
3113
3114 static __be32
3115 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3116 {
3117 struct svc_fh *fhp = getattr->ga_fhp;
3118 struct xdr_stream *xdr = &resp->xdr;
3119
3120 if (nfserr)
3121 return nfserr;
3122
3123 nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3124 getattr->ga_bmval,
3125 resp->rqstp, 0);
3126 return nfserr;
3127 }
3128
3129 static __be32
3130 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3131 {
3132 struct xdr_stream *xdr = &resp->xdr;
3133 struct svc_fh *fhp = *fhpp;
3134 unsigned int len;
3135 __be32 *p;
3136
3137 if (!nfserr) {
3138 len = fhp->fh_handle.fh_size;
3139 p = xdr_reserve_space(xdr, len + 4);
3140 if (!p)
3141 return nfserr_resource;
3142 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3143 }
3144 return nfserr;
3145 }
3146
3147 /*
3148 * Including all fields other than the name, a LOCK4denied structure requires
3149 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3150 */
3151 static __be32
3152 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3153 {
3154 struct xdr_netobj *conf = &ld->ld_owner;
3155 __be32 *p;
3156
3157 again:
3158 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3159 if (!p) {
3160 /*
3161 * Don't fail to return the result just because we can't
3162 * return the conflicting open:
3163 */
3164 if (conf->len) {
3165 kfree(conf->data);
3166 conf->len = 0;
3167 conf->data = NULL;
3168 goto again;
3169 }
3170 return nfserr_resource;
3171 }
3172 p = xdr_encode_hyper(p, ld->ld_start);
3173 p = xdr_encode_hyper(p, ld->ld_length);
3174 *p++ = cpu_to_be32(ld->ld_type);
3175 if (conf->len) {
3176 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3177 p = xdr_encode_opaque(p, conf->data, conf->len);
3178 kfree(conf->data);
3179 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
3180 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3181 *p++ = cpu_to_be32(0); /* length of owner name */
3182 }
3183 return nfserr_denied;
3184 }
3185
3186 static __be32
3187 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3188 {
3189 struct xdr_stream *xdr = &resp->xdr;
3190
3191 if (!nfserr)
3192 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3193 else if (nfserr == nfserr_denied)
3194 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3195
3196 return nfserr;
3197 }
3198
3199 static __be32
3200 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3201 {
3202 struct xdr_stream *xdr = &resp->xdr;
3203
3204 if (nfserr == nfserr_denied)
3205 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3206 return nfserr;
3207 }
3208
3209 static __be32
3210 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3211 {
3212 struct xdr_stream *xdr = &resp->xdr;
3213
3214 if (!nfserr)
3215 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3216
3217 return nfserr;
3218 }
3219
3220
3221 static __be32
3222 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3223 {
3224 struct xdr_stream *xdr = &resp->xdr;
3225 __be32 *p;
3226
3227 if (!nfserr) {
3228 p = xdr_reserve_space(xdr, 20);
3229 if (!p)
3230 return nfserr_resource;
3231 p = encode_cinfo(p, &link->li_cinfo);
3232 }
3233 return nfserr;
3234 }
3235
3236
3237 static __be32
3238 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3239 {
3240 struct xdr_stream *xdr = &resp->xdr;
3241 __be32 *p;
3242
3243 if (nfserr)
3244 goto out;
3245
3246 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3247 if (nfserr)
3248 goto out;
3249 p = xdr_reserve_space(xdr, 24);
3250 if (!p)
3251 return nfserr_resource;
3252 p = encode_cinfo(p, &open->op_cinfo);
3253 *p++ = cpu_to_be32(open->op_rflags);
3254
3255 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3256 open->op_bmval[2]);
3257 if (nfserr)
3258 goto out;
3259
3260 p = xdr_reserve_space(xdr, 4);
3261 if (!p)
3262 return nfserr_resource;
3263
3264 *p++ = cpu_to_be32(open->op_delegate_type);
3265 switch (open->op_delegate_type) {
3266 case NFS4_OPEN_DELEGATE_NONE:
3267 break;
3268 case NFS4_OPEN_DELEGATE_READ:
3269 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3270 if (nfserr)
3271 return nfserr;
3272 p = xdr_reserve_space(xdr, 20);
3273 if (!p)
3274 return nfserr_resource;
3275 *p++ = cpu_to_be32(open->op_recall);
3276
3277 /*
3278 * TODO: ACE's in delegations
3279 */
3280 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3281 *p++ = cpu_to_be32(0);
3282 *p++ = cpu_to_be32(0);
3283 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3284 break;
3285 case NFS4_OPEN_DELEGATE_WRITE:
3286 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3287 if (nfserr)
3288 return nfserr;
3289 p = xdr_reserve_space(xdr, 32);
3290 if (!p)
3291 return nfserr_resource;
3292 *p++ = cpu_to_be32(0);
3293
3294 /*
3295 * TODO: space_limit's in delegations
3296 */
3297 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3298 *p++ = cpu_to_be32(~(u32)0);
3299 *p++ = cpu_to_be32(~(u32)0);
3300
3301 /*
3302 * TODO: ACE's in delegations
3303 */
3304 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3305 *p++ = cpu_to_be32(0);
3306 *p++ = cpu_to_be32(0);
3307 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3308 break;
3309 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3310 switch (open->op_why_no_deleg) {
3311 case WND4_CONTENTION:
3312 case WND4_RESOURCE:
3313 p = xdr_reserve_space(xdr, 8);
3314 if (!p)
3315 return nfserr_resource;
3316 *p++ = cpu_to_be32(open->op_why_no_deleg);
3317 /* deleg signaling not supported yet: */
3318 *p++ = cpu_to_be32(0);
3319 break;
3320 default:
3321 p = xdr_reserve_space(xdr, 4);
3322 if (!p)
3323 return nfserr_resource;
3324 *p++ = cpu_to_be32(open->op_why_no_deleg);
3325 }
3326 break;
3327 default:
3328 BUG();
3329 }
3330 /* XXX save filehandle here */
3331 out:
3332 return nfserr;
3333 }
3334
3335 static __be32
3336 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3337 {
3338 struct xdr_stream *xdr = &resp->xdr;
3339
3340 if (!nfserr)
3341 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3342
3343 return nfserr;
3344 }
3345
3346 static __be32
3347 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3348 {
3349 struct xdr_stream *xdr = &resp->xdr;
3350
3351 if (!nfserr)
3352 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3353
3354 return nfserr;
3355 }
3356
3357 static __be32 nfsd4_encode_splice_read(
3358 struct nfsd4_compoundres *resp,
3359 struct nfsd4_read *read,
3360 struct file *file, unsigned long maxcount)
3361 {
3362 struct xdr_stream *xdr = &resp->xdr;
3363 struct xdr_buf *buf = xdr->buf;
3364 u32 eof;
3365 int space_left;
3366 __be32 nfserr;
3367 __be32 *p = xdr->p - 2;
3368
3369 /* Make sure there will be room for padding if needed */
3370 if (xdr->end - xdr->p < 1)
3371 return nfserr_resource;
3372
3373 nfserr = nfsd_splice_read(read->rd_rqstp, file,
3374 read->rd_offset, &maxcount);
3375 if (nfserr) {
3376 /*
3377 * nfsd_splice_actor may have already messed with the
3378 * page length; reset it so as not to confuse
3379 * xdr_truncate_encode:
3380 */
3381 buf->page_len = 0;
3382 return nfserr;
3383 }
3384
3385 eof = (read->rd_offset + maxcount >=
3386 d_inode(read->rd_fhp->fh_dentry)->i_size);
3387
3388 *(p++) = htonl(eof);
3389 *(p++) = htonl(maxcount);
3390
3391 buf->page_len = maxcount;
3392 buf->len += maxcount;
3393 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3394 / PAGE_SIZE;
3395
3396 /* Use rest of head for padding and remaining ops: */
3397 buf->tail[0].iov_base = xdr->p;
3398 buf->tail[0].iov_len = 0;
3399 xdr->iov = buf->tail;
3400 if (maxcount&3) {
3401 int pad = 4 - (maxcount&3);
3402
3403 *(xdr->p++) = 0;
3404
3405 buf->tail[0].iov_base += maxcount&3;
3406 buf->tail[0].iov_len = pad;
3407 buf->len += pad;
3408 }
3409
3410 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3411 buf->buflen - buf->len);
3412 buf->buflen = buf->len + space_left;
3413 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3414
3415 return 0;
3416 }
3417
3418 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3419 struct nfsd4_read *read,
3420 struct file *file, unsigned long maxcount)
3421 {
3422 struct xdr_stream *xdr = &resp->xdr;
3423 u32 eof;
3424 int v;
3425 int starting_len = xdr->buf->len - 8;
3426 long len;
3427 int thislen;
3428 __be32 nfserr;
3429 __be32 tmp;
3430 __be32 *p;
3431 u32 zzz = 0;
3432 int pad;
3433
3434 len = maxcount;
3435 v = 0;
3436
3437 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3438 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3439 WARN_ON_ONCE(!p);
3440 resp->rqstp->rq_vec[v].iov_base = p;
3441 resp->rqstp->rq_vec[v].iov_len = thislen;
3442 v++;
3443 len -= thislen;
3444
3445 while (len) {
3446 thislen = min_t(long, len, PAGE_SIZE);
3447 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3448 WARN_ON_ONCE(!p);
3449 resp->rqstp->rq_vec[v].iov_base = p;
3450 resp->rqstp->rq_vec[v].iov_len = thislen;
3451 v++;
3452 len -= thislen;
3453 }
3454 read->rd_vlen = v;
3455
3456 nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3457 read->rd_vlen, &maxcount);
3458 if (nfserr)
3459 return nfserr;
3460 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3461
3462 eof = (read->rd_offset + maxcount >=
3463 d_inode(read->rd_fhp->fh_dentry)->i_size);
3464
3465 tmp = htonl(eof);
3466 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3467 tmp = htonl(maxcount);
3468 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3469
3470 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3471 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3472 &zzz, pad);
3473 return 0;
3474
3475 }
3476
3477 static __be32
3478 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3479 struct nfsd4_read *read)
3480 {
3481 unsigned long maxcount;
3482 struct xdr_stream *xdr = &resp->xdr;
3483 struct file *file = read->rd_filp;
3484 int starting_len = xdr->buf->len;
3485 struct raparms *ra = NULL;
3486 __be32 *p;
3487
3488 if (nfserr)
3489 goto out;
3490
3491 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3492 if (!p) {
3493 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3494 nfserr = nfserr_resource;
3495 goto out;
3496 }
3497 if (resp->xdr.buf->page_len &&
3498 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3499 WARN_ON_ONCE(1);
3500 nfserr = nfserr_resource;
3501 goto out;
3502 }
3503 xdr_commit_encode(xdr);
3504
3505 maxcount = svc_max_payload(resp->rqstp);
3506 maxcount = min_t(unsigned long, maxcount,
3507 (xdr->buf->buflen - xdr->buf->len));
3508 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3509
3510 if (read->rd_tmp_file)
3511 ra = nfsd_init_raparms(file);
3512
3513 if (file->f_op->splice_read &&
3514 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3515 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3516 else
3517 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3518
3519 if (ra)
3520 nfsd_put_raparams(file, ra);
3521
3522 if (nfserr)
3523 xdr_truncate_encode(xdr, starting_len);
3524
3525 out:
3526 if (file)
3527 fput(file);
3528 return nfserr;
3529 }
3530
3531 static __be32
3532 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3533 {
3534 int maxcount;
3535 __be32 wire_count;
3536 int zero = 0;
3537 struct xdr_stream *xdr = &resp->xdr;
3538 int length_offset = xdr->buf->len;
3539 __be32 *p;
3540
3541 if (nfserr)
3542 return nfserr;
3543
3544 p = xdr_reserve_space(xdr, 4);
3545 if (!p)
3546 return nfserr_resource;
3547 maxcount = PAGE_SIZE;
3548
3549 p = xdr_reserve_space(xdr, maxcount);
3550 if (!p)
3551 return nfserr_resource;
3552 /*
3553 * XXX: By default, the ->readlink() VFS op will truncate symlinks
3554 * if they would overflow the buffer. Is this kosher in NFSv4? If
3555 * not, one easy fix is: if ->readlink() precisely fills the buffer,
3556 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3557 */
3558 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3559 (char *)p, &maxcount);
3560 if (nfserr == nfserr_isdir)
3561 nfserr = nfserr_inval;
3562 if (nfserr) {
3563 xdr_truncate_encode(xdr, length_offset);
3564 return nfserr;
3565 }
3566
3567 wire_count = htonl(maxcount);
3568 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3569 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3570 if (maxcount & 3)
3571 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3572 &zero, 4 - (maxcount&3));
3573 return 0;
3574 }
3575
3576 static __be32
3577 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3578 {
3579 int maxcount;
3580 int bytes_left;
3581 loff_t offset;
3582 __be64 wire_offset;
3583 struct xdr_stream *xdr = &resp->xdr;
3584 int starting_len = xdr->buf->len;
3585 __be32 *p;
3586
3587 if (nfserr)
3588 return nfserr;
3589
3590 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3591 if (!p)
3592 return nfserr_resource;
3593
3594 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3595 *p++ = cpu_to_be32(0);
3596 *p++ = cpu_to_be32(0);
3597 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3598 - (char *)resp->xdr.buf->head[0].iov_base;
3599
3600 /*
3601 * Number of bytes left for directory entries allowing for the
3602 * final 8 bytes of the readdir and a following failed op:
3603 */
3604 bytes_left = xdr->buf->buflen - xdr->buf->len
3605 - COMPOUND_ERR_SLACK_SPACE - 8;
3606 if (bytes_left < 0) {
3607 nfserr = nfserr_resource;
3608 goto err_no_verf;
3609 }
3610 maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3611 /*
3612 * Note the rfc defines rd_maxcount as the size of the
3613 * READDIR4resok structure, which includes the verifier above
3614 * and the 8 bytes encoded at the end of this function:
3615 */
3616 if (maxcount < 16) {
3617 nfserr = nfserr_toosmall;
3618 goto err_no_verf;
3619 }
3620 maxcount = min_t(int, maxcount-16, bytes_left);
3621
3622 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3623 if (!readdir->rd_dircount)
3624 readdir->rd_dircount = INT_MAX;
3625
3626 readdir->xdr = xdr;
3627 readdir->rd_maxcount = maxcount;
3628 readdir->common.err = 0;
3629 readdir->cookie_offset = 0;
3630
3631 offset = readdir->rd_cookie;
3632 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3633 &offset,
3634 &readdir->common, nfsd4_encode_dirent);
3635 if (nfserr == nfs_ok &&
3636 readdir->common.err == nfserr_toosmall &&
3637 xdr->buf->len == starting_len + 8) {
3638 /* nothing encoded; which limit did we hit?: */
3639 if (maxcount - 16 < bytes_left)
3640 /* It was the fault of rd_maxcount: */
3641 nfserr = nfserr_toosmall;
3642 else
3643 /* We ran out of buffer space: */
3644 nfserr = nfserr_resource;
3645 }
3646 if (nfserr)
3647 goto err_no_verf;
3648
3649 if (readdir->cookie_offset) {
3650 wire_offset = cpu_to_be64(offset);
3651 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3652 &wire_offset, 8);
3653 }
3654
3655 p = xdr_reserve_space(xdr, 8);
3656 if (!p) {
3657 WARN_ON_ONCE(1);
3658 goto err_no_verf;
3659 }
3660 *p++ = 0; /* no more entries */
3661 *p++ = htonl(readdir->common.err == nfserr_eof);
3662
3663 return 0;
3664 err_no_verf:
3665 xdr_truncate_encode(xdr, starting_len);
3666 return nfserr;
3667 }
3668
3669 static __be32
3670 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3671 {
3672 struct xdr_stream *xdr = &resp->xdr;
3673 __be32 *p;
3674
3675 if (!nfserr) {
3676 p = xdr_reserve_space(xdr, 20);
3677 if (!p)
3678 return nfserr_resource;
3679 p = encode_cinfo(p, &remove->rm_cinfo);
3680 }
3681 return nfserr;
3682 }
3683
3684 static __be32
3685 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3686 {
3687 struct xdr_stream *xdr = &resp->xdr;
3688 __be32 *p;
3689
3690 if (!nfserr) {
3691 p = xdr_reserve_space(xdr, 40);
3692 if (!p)
3693 return nfserr_resource;
3694 p = encode_cinfo(p, &rename->rn_sinfo);
3695 p = encode_cinfo(p, &rename->rn_tinfo);
3696 }
3697 return nfserr;
3698 }
3699
3700 static __be32
3701 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3702 __be32 nfserr, struct svc_export *exp)
3703 {
3704 u32 i, nflavs, supported;
3705 struct exp_flavor_info *flavs;
3706 struct exp_flavor_info def_flavs[2];
3707 __be32 *p, *flavorsp;
3708 static bool report = true;
3709
3710 if (nfserr)
3711 goto out;
3712 nfserr = nfserr_resource;
3713 if (exp->ex_nflavors) {
3714 flavs = exp->ex_flavors;
3715 nflavs = exp->ex_nflavors;
3716 } else { /* Handling of some defaults in absence of real secinfo: */
3717 flavs = def_flavs;
3718 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3719 nflavs = 2;
3720 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3721 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3722 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3723 nflavs = 1;
3724 flavs[0].pseudoflavor
3725 = svcauth_gss_flavor(exp->ex_client);
3726 } else {
3727 nflavs = 1;
3728 flavs[0].pseudoflavor
3729 = exp->ex_client->flavour->flavour;
3730 }
3731 }
3732
3733 supported = 0;
3734 p = xdr_reserve_space(xdr, 4);
3735 if (!p)
3736 goto out;
3737 flavorsp = p++; /* to be backfilled later */
3738
3739 for (i = 0; i < nflavs; i++) {
3740 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3741 struct rpcsec_gss_info info;
3742
3743 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3744 supported++;
3745 p = xdr_reserve_space(xdr, 4 + 4 +
3746 XDR_LEN(info.oid.len) + 4 + 4);
3747 if (!p)
3748 goto out;
3749 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3750 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3751 *p++ = cpu_to_be32(info.qop);
3752 *p++ = cpu_to_be32(info.service);
3753 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3754 supported++;
3755 p = xdr_reserve_space(xdr, 4);
3756 if (!p)
3757 goto out;
3758 *p++ = cpu_to_be32(pf);
3759 } else {
3760 if (report)
3761 pr_warn("NFS: SECINFO: security flavor %u "
3762 "is not supported\n", pf);
3763 }
3764 }
3765
3766 if (nflavs != supported)
3767 report = false;
3768 *flavorsp = htonl(supported);
3769 nfserr = 0;
3770 out:
3771 if (exp)
3772 exp_put(exp);
3773 return nfserr;
3774 }
3775
3776 static __be32
3777 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3778 struct nfsd4_secinfo *secinfo)
3779 {
3780 struct xdr_stream *xdr = &resp->xdr;
3781
3782 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3783 }
3784
3785 static __be32
3786 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3787 struct nfsd4_secinfo_no_name *secinfo)
3788 {
3789 struct xdr_stream *xdr = &resp->xdr;
3790
3791 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3792 }
3793
3794 /*
3795 * The SETATTR encode routine is special -- it always encodes a bitmap,
3796 * regardless of the error status.
3797 */
3798 static __be32
3799 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3800 {
3801 struct xdr_stream *xdr = &resp->xdr;
3802 __be32 *p;
3803
3804 p = xdr_reserve_space(xdr, 16);
3805 if (!p)
3806 return nfserr_resource;
3807 if (nfserr) {
3808 *p++ = cpu_to_be32(3);
3809 *p++ = cpu_to_be32(0);
3810 *p++ = cpu_to_be32(0);
3811 *p++ = cpu_to_be32(0);
3812 }
3813 else {
3814 *p++ = cpu_to_be32(3);
3815 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3816 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3817 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3818 }
3819 return nfserr;
3820 }
3821
3822 static __be32
3823 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3824 {
3825 struct xdr_stream *xdr = &resp->xdr;
3826 __be32 *p;
3827
3828 if (!nfserr) {
3829 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3830 if (!p)
3831 return nfserr_resource;
3832 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3833 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3834 NFS4_VERIFIER_SIZE);
3835 }
3836 else if (nfserr == nfserr_clid_inuse) {
3837 p = xdr_reserve_space(xdr, 8);
3838 if (!p)
3839 return nfserr_resource;
3840 *p++ = cpu_to_be32(0);
3841 *p++ = cpu_to_be32(0);
3842 }
3843 return nfserr;
3844 }
3845
3846 static __be32
3847 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3848 {
3849 struct xdr_stream *xdr = &resp->xdr;
3850 __be32 *p;
3851
3852 if (!nfserr) {
3853 p = xdr_reserve_space(xdr, 16);
3854 if (!p)
3855 return nfserr_resource;
3856 *p++ = cpu_to_be32(write->wr_bytes_written);
3857 *p++ = cpu_to_be32(write->wr_how_written);
3858 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3859 NFS4_VERIFIER_SIZE);
3860 }
3861 return nfserr;
3862 }
3863
3864 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3865 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3866 1 << (OP_EXCHANGE_ID - 32) |
3867 1 << (OP_CREATE_SESSION - 32) |
3868 1 << (OP_DESTROY_SESSION - 32) |
3869 1 << (OP_DESTROY_CLIENTID - 32)
3870 };
3871
3872 static __be32
3873 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3874 struct nfsd4_exchange_id *exid)
3875 {
3876 struct xdr_stream *xdr = &resp->xdr;
3877 __be32 *p;
3878 char *major_id;
3879 char *server_scope;
3880 int major_id_sz;
3881 int server_scope_sz;
3882 uint64_t minor_id = 0;
3883
3884 if (nfserr)
3885 return nfserr;
3886
3887 major_id = utsname()->nodename;
3888 major_id_sz = strlen(major_id);
3889 server_scope = utsname()->nodename;
3890 server_scope_sz = strlen(server_scope);
3891
3892 p = xdr_reserve_space(xdr,
3893 8 /* eir_clientid */ +
3894 4 /* eir_sequenceid */ +
3895 4 /* eir_flags */ +
3896 4 /* spr_how */);
3897 if (!p)
3898 return nfserr_resource;
3899
3900 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3901 *p++ = cpu_to_be32(exid->seqid);
3902 *p++ = cpu_to_be32(exid->flags);
3903
3904 *p++ = cpu_to_be32(exid->spa_how);
3905
3906 switch (exid->spa_how) {
3907 case SP4_NONE:
3908 break;
3909 case SP4_MACH_CRED:
3910 /* spo_must_enforce, spo_must_allow */
3911 p = xdr_reserve_space(xdr, 16);
3912 if (!p)
3913 return nfserr_resource;
3914
3915 /* spo_must_enforce bitmap: */
3916 *p++ = cpu_to_be32(2);
3917 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3918 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3919 /* empty spo_must_allow bitmap: */
3920 *p++ = cpu_to_be32(0);
3921
3922 break;
3923 default:
3924 WARN_ON_ONCE(1);
3925 }
3926
3927 p = xdr_reserve_space(xdr,
3928 8 /* so_minor_id */ +
3929 4 /* so_major_id.len */ +
3930 (XDR_QUADLEN(major_id_sz) * 4) +
3931 4 /* eir_server_scope.len */ +
3932 (XDR_QUADLEN(server_scope_sz) * 4) +
3933 4 /* eir_server_impl_id.count (0) */);
3934 if (!p)
3935 return nfserr_resource;
3936
3937 /* The server_owner struct */
3938 p = xdr_encode_hyper(p, minor_id); /* Minor id */
3939 /* major id */
3940 p = xdr_encode_opaque(p, major_id, major_id_sz);
3941
3942 /* Server scope */
3943 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3944
3945 /* Implementation id */
3946 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
3947 return 0;
3948 }
3949
3950 static __be32
3951 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3952 struct nfsd4_create_session *sess)
3953 {
3954 struct xdr_stream *xdr = &resp->xdr;
3955 __be32 *p;
3956
3957 if (nfserr)
3958 return nfserr;
3959
3960 p = xdr_reserve_space(xdr, 24);
3961 if (!p)
3962 return nfserr_resource;
3963 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3964 NFS4_MAX_SESSIONID_LEN);
3965 *p++ = cpu_to_be32(sess->seqid);
3966 *p++ = cpu_to_be32(sess->flags);
3967
3968 p = xdr_reserve_space(xdr, 28);
3969 if (!p)
3970 return nfserr_resource;
3971 *p++ = cpu_to_be32(0); /* headerpadsz */
3972 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3973 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3974 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3975 *p++ = cpu_to_be32(sess->fore_channel.maxops);
3976 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3977 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3978
3979 if (sess->fore_channel.nr_rdma_attrs) {
3980 p = xdr_reserve_space(xdr, 4);
3981 if (!p)
3982 return nfserr_resource;
3983 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3984 }
3985
3986 p = xdr_reserve_space(xdr, 28);
3987 if (!p)
3988 return nfserr_resource;
3989 *p++ = cpu_to_be32(0); /* headerpadsz */
3990 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3991 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3992 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3993 *p++ = cpu_to_be32(sess->back_channel.maxops);
3994 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3995 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3996
3997 if (sess->back_channel.nr_rdma_attrs) {
3998 p = xdr_reserve_space(xdr, 4);
3999 if (!p)
4000 return nfserr_resource;
4001 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4002 }
4003 return 0;
4004 }
4005
4006 static __be32
4007 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4008 struct nfsd4_sequence *seq)
4009 {
4010 struct xdr_stream *xdr = &resp->xdr;
4011 __be32 *p;
4012
4013 if (nfserr)
4014 return nfserr;
4015
4016 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4017 if (!p)
4018 return nfserr_resource;
4019 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4020 NFS4_MAX_SESSIONID_LEN);
4021 *p++ = cpu_to_be32(seq->seqid);
4022 *p++ = cpu_to_be32(seq->slotid);
4023 /* Note slotid's are numbered from zero: */
4024 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4025 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4026 *p++ = cpu_to_be32(seq->status_flags);
4027
4028 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4029 return 0;
4030 }
4031
4032 static __be32
4033 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4034 struct nfsd4_test_stateid *test_stateid)
4035 {
4036 struct xdr_stream *xdr = &resp->xdr;
4037 struct nfsd4_test_stateid_id *stateid, *next;
4038 __be32 *p;
4039
4040 if (nfserr)
4041 return nfserr;
4042
4043 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4044 if (!p)
4045 return nfserr_resource;
4046 *p++ = htonl(test_stateid->ts_num_ids);
4047
4048 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4049 *p++ = stateid->ts_id_status;
4050 }
4051
4052 return nfserr;
4053 }
4054
4055 #ifdef CONFIG_NFSD_PNFS
4056 static __be32
4057 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4058 struct nfsd4_getdeviceinfo *gdev)
4059 {
4060 struct xdr_stream *xdr = &resp->xdr;
4061 const struct nfsd4_layout_ops *ops =
4062 nfsd4_layout_ops[gdev->gd_layout_type];
4063 u32 starting_len = xdr->buf->len, needed_len;
4064 __be32 *p;
4065
4066 dprintk("%s: err %d\n", __func__, nfserr);
4067 if (nfserr)
4068 goto out;
4069
4070 nfserr = nfserr_resource;
4071 p = xdr_reserve_space(xdr, 4);
4072 if (!p)
4073 goto out;
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 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4080 if (nfserr) {
4081 /*
4082 * We don't bother to burden the layout drivers with
4083 * enforcing gd_maxcount, just tell the client to
4084 * come back with a bigger buffer if it's not enough.
4085 */
4086 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4087 goto toosmall;
4088 goto out;
4089 }
4090 }
4091
4092 nfserr = nfserr_resource;
4093 if (gdev->gd_notify_types) {
4094 p = xdr_reserve_space(xdr, 4 + 4);
4095 if (!p)
4096 goto out;
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 goto out;
4103 *p++ = 0;
4104 }
4105
4106 nfserr = 0;
4107 out:
4108 kfree(gdev->gd_device);
4109 dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4110 return nfserr;
4111
4112 toosmall:
4113 dprintk("%s: maxcount too small\n", __func__);
4114 needed_len = xdr->buf->len + 4 /* notifications */;
4115 xdr_truncate_encode(xdr, starting_len);
4116 p = xdr_reserve_space(xdr, 4);
4117 if (!p) {
4118 nfserr = nfserr_resource;
4119 } else {
4120 *p++ = cpu_to_be32(needed_len);
4121 nfserr = nfserr_toosmall;
4122 }
4123 goto out;
4124 }
4125
4126 static __be32
4127 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4128 struct nfsd4_layoutget *lgp)
4129 {
4130 struct xdr_stream *xdr = &resp->xdr;
4131 const struct nfsd4_layout_ops *ops =
4132 nfsd4_layout_ops[lgp->lg_layout_type];
4133 __be32 *p;
4134
4135 dprintk("%s: err %d\n", __func__, nfserr);
4136 if (nfserr)
4137 goto out;
4138
4139 nfserr = nfserr_resource;
4140 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4141 if (!p)
4142 goto out;
4143
4144 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4145 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4146 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4147 sizeof(stateid_opaque_t));
4148
4149 *p++ = cpu_to_be32(1); /* we always return a single layout */
4150 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4151 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4152 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4153 *p++ = cpu_to_be32(lgp->lg_layout_type);
4154
4155 nfserr = ops->encode_layoutget(xdr, lgp);
4156 out:
4157 kfree(lgp->lg_content);
4158 return nfserr;
4159 }
4160
4161 static __be32
4162 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4163 struct nfsd4_layoutcommit *lcp)
4164 {
4165 struct xdr_stream *xdr = &resp->xdr;
4166 __be32 *p;
4167
4168 if (nfserr)
4169 return nfserr;
4170
4171 p = xdr_reserve_space(xdr, 4);
4172 if (!p)
4173 return nfserr_resource;
4174 *p++ = cpu_to_be32(lcp->lc_size_chg);
4175 if (lcp->lc_size_chg) {
4176 p = xdr_reserve_space(xdr, 8);
4177 if (!p)
4178 return nfserr_resource;
4179 p = xdr_encode_hyper(p, lcp->lc_newsize);
4180 }
4181
4182 return nfs_ok;
4183 }
4184
4185 static __be32
4186 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4187 struct nfsd4_layoutreturn *lrp)
4188 {
4189 struct xdr_stream *xdr = &resp->xdr;
4190 __be32 *p;
4191
4192 if (nfserr)
4193 return nfserr;
4194
4195 p = xdr_reserve_space(xdr, 4);
4196 if (!p)
4197 return nfserr_resource;
4198 *p++ = cpu_to_be32(lrp->lrs_present);
4199 if (lrp->lrs_present)
4200 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4201 return nfs_ok;
4202 }
4203 #endif /* CONFIG_NFSD_PNFS */
4204
4205 static __be32
4206 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4207 struct nfsd4_seek *seek)
4208 {
4209 __be32 *p;
4210
4211 if (nfserr)
4212 return nfserr;
4213
4214 p = xdr_reserve_space(&resp->xdr, 4 + 8);
4215 *p++ = cpu_to_be32(seek->seek_eof);
4216 p = xdr_encode_hyper(p, seek->seek_pos);
4217
4218 return nfserr;
4219 }
4220
4221 static __be32
4222 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4223 {
4224 return nfserr;
4225 }
4226
4227 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4228
4229 /*
4230 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4231 * since we don't need to filter out obsolete ops as this is
4232 * done in the decoding phase.
4233 */
4234 static nfsd4_enc nfsd4_enc_ops[] = {
4235 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
4236 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
4237 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
4238 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
4239 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
4240 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4241 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
4242 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
4243 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
4244 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
4245 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
4246 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
4247 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
4248 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
4249 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4250 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
4251 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
4252 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
4253 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
4254 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
4255 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
4256 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
4257 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
4258 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
4259 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
4260 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
4261 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
4262 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
4263 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
4264 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
4265 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
4266 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
4267 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
4268 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4269 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4270 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
4271 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
4272
4273 /* NFSv4.1 operations */
4274 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
4275 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4276 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
4277 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
4278 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
4279 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
4280 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4281 #ifdef CONFIG_NFSD_PNFS
4282 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4283 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4284 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit,
4285 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget,
4286 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn,
4287 #else
4288 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
4289 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4290 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
4291 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
4292 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4293 #endif
4294 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4295 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
4296 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
4297 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
4298 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4299 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
4300 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
4301
4302 /* NFSv4.2 operations */
4303 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4304 [OP_COPY] = (nfsd4_enc)nfsd4_encode_noop,
4305 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
4306 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4307 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
4308 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
4309 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
4310 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
4311 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop,
4312 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
4313 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
4314 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
4315 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop,
4316 };
4317
4318 /*
4319 * Calculate whether we still have space to encode repsize bytes.
4320 * There are two considerations:
4321 * - For NFS versions >=4.1, the size of the reply must stay within
4322 * session limits
4323 * - For all NFS versions, we must stay within limited preallocated
4324 * buffer space.
4325 *
4326 * This is called before the operation is processed, so can only provide
4327 * an upper estimate. For some nonidempotent operations (such as
4328 * getattr), it's not necessarily a problem if that estimate is wrong,
4329 * as we can fail it after processing without significant side effects.
4330 */
4331 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4332 {
4333 struct xdr_buf *buf = &resp->rqstp->rq_res;
4334 struct nfsd4_slot *slot = resp->cstate.slot;
4335
4336 if (buf->len + respsize <= buf->buflen)
4337 return nfs_ok;
4338 if (!nfsd4_has_session(&resp->cstate))
4339 return nfserr_resource;
4340 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4341 WARN_ON_ONCE(1);
4342 return nfserr_rep_too_big_to_cache;
4343 }
4344 return nfserr_rep_too_big;
4345 }
4346
4347 void
4348 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4349 {
4350 struct xdr_stream *xdr = &resp->xdr;
4351 struct nfs4_stateowner *so = resp->cstate.replay_owner;
4352 struct svc_rqst *rqstp = resp->rqstp;
4353 int post_err_offset;
4354 nfsd4_enc encoder;
4355 __be32 *p;
4356
4357 p = xdr_reserve_space(xdr, 8);
4358 if (!p) {
4359 WARN_ON_ONCE(1);
4360 return;
4361 }
4362 *p++ = cpu_to_be32(op->opnum);
4363 post_err_offset = xdr->buf->len;
4364
4365 if (op->opnum == OP_ILLEGAL)
4366 goto status;
4367 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4368 !nfsd4_enc_ops[op->opnum]);
4369 encoder = nfsd4_enc_ops[op->opnum];
4370 op->status = encoder(resp, op->status, &op->u);
4371 xdr_commit_encode(xdr);
4372
4373 /* nfsd4_check_resp_size guarantees enough room for error status */
4374 if (!op->status) {
4375 int space_needed = 0;
4376 if (!nfsd4_last_compound_op(rqstp))
4377 space_needed = COMPOUND_ERR_SLACK_SPACE;
4378 op->status = nfsd4_check_resp_size(resp, space_needed);
4379 }
4380 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4381 struct nfsd4_slot *slot = resp->cstate.slot;
4382
4383 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4384 op->status = nfserr_rep_too_big_to_cache;
4385 else
4386 op->status = nfserr_rep_too_big;
4387 }
4388 if (op->status == nfserr_resource ||
4389 op->status == nfserr_rep_too_big ||
4390 op->status == nfserr_rep_too_big_to_cache) {
4391 /*
4392 * The operation may have already been encoded or
4393 * partially encoded. No op returns anything additional
4394 * in the case of one of these three errors, so we can
4395 * just truncate back to after the status. But it's a
4396 * bug if we had to do this on a non-idempotent op:
4397 */
4398 warn_on_nonidempotent_op(op);
4399 xdr_truncate_encode(xdr, post_err_offset);
4400 }
4401 if (so) {
4402 int len = xdr->buf->len - post_err_offset;
4403
4404 so->so_replay.rp_status = op->status;
4405 so->so_replay.rp_buflen = len;
4406 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4407 so->so_replay.rp_buf, len);
4408 }
4409 status:
4410 /* Note that op->status is already in network byte order: */
4411 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4412 }
4413
4414 /*
4415 * Encode the reply stored in the stateowner reply cache
4416 *
4417 * XDR note: do not encode rp->rp_buflen: the buffer contains the
4418 * previously sent already encoded operation.
4419 */
4420 void
4421 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4422 {
4423 __be32 *p;
4424 struct nfs4_replay *rp = op->replay;
4425
4426 BUG_ON(!rp);
4427
4428 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4429 if (!p) {
4430 WARN_ON_ONCE(1);
4431 return;
4432 }
4433 *p++ = cpu_to_be32(op->opnum);
4434 *p++ = rp->rp_status; /* already xdr'ed */
4435
4436 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4437 }
4438
4439 int
4440 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4441 {
4442 return xdr_ressize_check(rqstp, p);
4443 }
4444
4445 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4446 {
4447 struct svc_rqst *rqstp = rq;
4448 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4449
4450 if (args->ops != args->iops) {
4451 kfree(args->ops);
4452 args->ops = args->iops;
4453 }
4454 kfree(args->tmpp);
4455 args->tmpp = NULL;
4456 while (args->to_free) {
4457 struct svcxdr_tmpbuf *tb = args->to_free;
4458 args->to_free = tb->next;
4459 kfree(tb);
4460 }
4461 return 1;
4462 }
4463
4464 int
4465 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4466 {
4467 if (rqstp->rq_arg.head[0].iov_len % 4) {
4468 /* client is nuts */
4469 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4470 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4471 return 0;
4472 }
4473 args->p = p;
4474 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4475 args->pagelist = rqstp->rq_arg.pages;
4476 args->pagelen = rqstp->rq_arg.page_len;
4477 args->tmpp = NULL;
4478 args->to_free = NULL;
4479 args->ops = args->iops;
4480 args->rqstp = rqstp;
4481
4482 return !nfsd4_decode_compound(args);
4483 }
4484
4485 int
4486 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4487 {
4488 /*
4489 * All that remains is to write the tag and operation count...
4490 */
4491 struct xdr_buf *buf = resp->xdr.buf;
4492
4493 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4494 buf->tail[0].iov_len);
4495
4496 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4497
4498 p = resp->tagp;
4499 *p++ = htonl(resp->taglen);
4500 memcpy(p, resp->tag, resp->taglen);
4501 p += XDR_QUADLEN(resp->taglen);
4502 *p++ = htonl(resp->opcnt);
4503
4504 nfsd4_sequence_done(resp);
4505 return 1;
4506 }
4507
4508 /*
4509 * Local variables:
4510 * c-basic-offset: 8
4511 * End:
4512 */
Linux kernel - Deliverables
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