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Merge tag 'mtd/fixes-for-5.2-final' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6/linux-2.6-arm.git] / fs / nfsd / nfs4xdr.c
blob52c4f6daa649a5f4cdf8562c27457efea712fdbe
1 /*
2 * Server-side XDR for NFSv4
3 *
4 * Copyright (c) 2002 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <andros@umich.edu>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include <linux/file.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/statfs.h>
40 #include <linux/utsname.h>
41 #include <linux/pagemap.h>
42 #include <linux/sunrpc/svcauth_gss.h>
43
44 #include "idmap.h"
45 #include "acl.h"
46 #include "xdr4.h"
47 #include "vfs.h"
48 #include "state.h"
49 #include "cache.h"
50 #include "netns.h"
51 #include "pnfs.h"
52
53 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
54 #include <linux/security.h>
55 #endif
56
57
58 #define NFSDDBG_FACILITY NFSDDBG_XDR
59
60 const u32 nfsd_suppattrs[3][3] = {
61 {NFSD4_SUPPORTED_ATTRS_WORD0,
62 NFSD4_SUPPORTED_ATTRS_WORD1,
63 NFSD4_SUPPORTED_ATTRS_WORD2},
64
65 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
66 NFSD4_1_SUPPORTED_ATTRS_WORD1,
67 NFSD4_1_SUPPORTED_ATTRS_WORD2},
68
69 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
70 NFSD4_1_SUPPORTED_ATTRS_WORD1,
71 NFSD4_2_SUPPORTED_ATTRS_WORD2},
72 };
73
74 /*
75 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
76 * directory in order to indicate to the client that a filesystem boundary is present
77 * We use a fixed fsid for a referral
78 */
79 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
80 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
81
82 static __be32
83 check_filename(char *str, int len)
84 {
85 int i;
86
87 if (len == 0)
88 return nfserr_inval;
89 if (isdotent(str, len))
90 return nfserr_badname;
91 for (i = 0; i < len; i++)
92 if (str[i] == '/')
93 return nfserr_badname;
94 return 0;
95 }
96
97 #define DECODE_HEAD \
98 __be32 *p; \
99 __be32 status
100 #define DECODE_TAIL \
101 status = 0; \
102 out: \
103 return status; \
104 xdr_error: \
105 dprintk("NFSD: xdr error (%s:%d)\n", \
106 __FILE__, __LINE__); \
107 status = nfserr_bad_xdr; \
108 goto out
109
110 #define READMEM(x,nbytes) do { \
111 x = (char *)p; \
112 p += XDR_QUADLEN(nbytes); \
113 } while (0)
114 #define SAVEMEM(x,nbytes) do { \
115 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
116 savemem(argp, p, nbytes) : \
117 (char *)p)) { \
118 dprintk("NFSD: xdr error (%s:%d)\n", \
119 __FILE__, __LINE__); \
120 goto xdr_error; \
121 } \
122 p += XDR_QUADLEN(nbytes); \
123 } while (0)
124 #define COPYMEM(x,nbytes) do { \
125 memcpy((x), p, nbytes); \
126 p += XDR_QUADLEN(nbytes); \
127 } while (0)
128
129 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
130 #define READ_BUF(nbytes) do { \
131 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
132 p = argp->p; \
133 argp->p += XDR_QUADLEN(nbytes); \
134 } else if (!(p = read_buf(argp, nbytes))) { \
135 dprintk("NFSD: xdr error (%s:%d)\n", \
136 __FILE__, __LINE__); \
137 goto xdr_error; \
138 } \
139 } while (0)
140
141 static void next_decode_page(struct nfsd4_compoundargs *argp)
142 {
143 argp->p = page_address(argp->pagelist[0]);
144 argp->pagelist++;
145 if (argp->pagelen < PAGE_SIZE) {
146 argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
147 argp->pagelen = 0;
148 } else {
149 argp->end = argp->p + (PAGE_SIZE>>2);
150 argp->pagelen -= PAGE_SIZE;
151 }
152 }
153
154 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
155 {
156 /* We want more bytes than seem to be available.
157 * Maybe we need a new page, maybe we have just run out
158 */
159 unsigned int avail = (char *)argp->end - (char *)argp->p;
160 __be32 *p;
161
162 if (argp->pagelen == 0) {
163 struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
164
165 if (!argp->tail) {
166 argp->tail = true;
167 avail = vec->iov_len;
168 argp->p = vec->iov_base;
169 argp->end = vec->iov_base + avail;
170 }
171
172 if (avail < nbytes)
173 return NULL;
174
175 p = argp->p;
176 argp->p += XDR_QUADLEN(nbytes);
177 return p;
178 }
179
180 if (avail + argp->pagelen < nbytes)
181 return NULL;
182 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
183 return NULL;
184 /* ok, we can do it with the current plus the next page */
185 if (nbytes <= sizeof(argp->tmp))
186 p = argp->tmp;
187 else {
188 kfree(argp->tmpp);
189 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
190 if (!p)
191 return NULL;
192
193 }
194 /*
195 * The following memcpy is safe because read_buf is always
196 * called with nbytes > avail, and the two cases above both
197 * guarantee p points to at least nbytes bytes.
198 */
199 memcpy(p, argp->p, avail);
200 next_decode_page(argp);
201 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
202 argp->p += XDR_QUADLEN(nbytes - avail);
203 return p;
204 }
205
206 static int zero_clientid(clientid_t *clid)
207 {
208 return (clid->cl_boot == 0) && (clid->cl_id == 0);
209 }
210
211 /**
212 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
213 * @argp: NFSv4 compound argument structure
214 * @p: pointer to be freed (with kfree())
215 *
216 * Marks @p to be freed when processing the compound operation
217 * described in @argp finishes.
218 */
219 static void *
220 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
221 {
222 struct svcxdr_tmpbuf *tb;
223
224 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
225 if (!tb)
226 return NULL;
227 tb->next = argp->to_free;
228 argp->to_free = tb;
229 return tb->buf;
230 }
231
232 /*
233 * For xdr strings that need to be passed to other kernel api's
234 * as null-terminated strings.
235 *
236 * Note null-terminating in place usually isn't safe since the
237 * buffer might end on a page boundary.
238 */
239 static char *
240 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
241 {
242 char *p = svcxdr_tmpalloc(argp, len + 1);
243
244 if (!p)
245 return NULL;
246 memcpy(p, buf, len);
247 p[len] = '\0';
248 return p;
249 }
250
251 /**
252 * savemem - duplicate a chunk of memory for later processing
253 * @argp: NFSv4 compound argument structure to be freed with
254 * @p: pointer to be duplicated
255 * @nbytes: length to be duplicated
256 *
257 * Returns a pointer to a copy of @nbytes bytes of memory at @p
258 * that are preserved until processing of the NFSv4 compound
259 * operation described by @argp finishes.
260 */
261 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
262 {
263 void *ret;
264
265 ret = svcxdr_tmpalloc(argp, nbytes);
266 if (!ret)
267 return NULL;
268 memcpy(ret, p, nbytes);
269 return ret;
270 }
271
272 /*
273 * We require the high 32 bits of 'seconds' to be 0, and
274 * we ignore all 32 bits of 'nseconds'.
275 */
276 static __be32
277 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
278 {
279 DECODE_HEAD;
280 u64 sec;
281
282 READ_BUF(12);
283 p = xdr_decode_hyper(p, &sec);
284 tv->tv_sec = sec;
285 tv->tv_nsec = be32_to_cpup(p++);
286 if (tv->tv_nsec >= (u32)1000000000)
287 return nfserr_inval;
288
289 DECODE_TAIL;
290 }
291
292 static __be32
293 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
294 {
295 u32 bmlen;
296 DECODE_HEAD;
297
298 bmval[0] = 0;
299 bmval[1] = 0;
300 bmval[2] = 0;
301
302 READ_BUF(4);
303 bmlen = be32_to_cpup(p++);
304 if (bmlen > 1000)
305 goto xdr_error;
306
307 READ_BUF(bmlen << 2);
308 if (bmlen > 0)
309 bmval[0] = be32_to_cpup(p++);
310 if (bmlen > 1)
311 bmval[1] = be32_to_cpup(p++);
312 if (bmlen > 2)
313 bmval[2] = be32_to_cpup(p++);
314
315 DECODE_TAIL;
316 }
317
318 static __be32
319 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
320 struct iattr *iattr, struct nfs4_acl **acl,
321 struct xdr_netobj *label, int *umask)
322 {
323 struct timespec ts;
324 int expected_len, len = 0;
325 u32 dummy32;
326 char *buf;
327
328 DECODE_HEAD;
329 iattr->ia_valid = 0;
330 if ((status = nfsd4_decode_bitmap(argp, bmval)))
331 return status;
332
333 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
334 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
335 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
336 if (nfsd_attrs_supported(argp->minorversion, bmval))
337 return nfserr_inval;
338 return nfserr_attrnotsupp;
339 }
340
341 READ_BUF(4);
342 expected_len = be32_to_cpup(p++);
343
344 if (bmval[0] & FATTR4_WORD0_SIZE) {
345 READ_BUF(8);
346 len += 8;
347 p = xdr_decode_hyper(p, &iattr->ia_size);
348 iattr->ia_valid |= ATTR_SIZE;
349 }
350 if (bmval[0] & FATTR4_WORD0_ACL) {
351 u32 nace;
352 struct nfs4_ace *ace;
353
354 READ_BUF(4); len += 4;
355 nace = be32_to_cpup(p++);
356
357 if (nace > NFS4_ACL_MAX)
358 return nfserr_fbig;
359
360 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
361 if (*acl == NULL)
362 return nfserr_jukebox;
363
364 (*acl)->naces = nace;
365 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
366 READ_BUF(16); len += 16;
367 ace->type = be32_to_cpup(p++);
368 ace->flag = be32_to_cpup(p++);
369 ace->access_mask = be32_to_cpup(p++);
370 dummy32 = be32_to_cpup(p++);
371 READ_BUF(dummy32);
372 len += XDR_QUADLEN(dummy32) << 2;
373 READMEM(buf, dummy32);
374 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
375 status = nfs_ok;
376 if (ace->whotype != NFS4_ACL_WHO_NAMED)
377 ;
378 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
379 status = nfsd_map_name_to_gid(argp->rqstp,
380 buf, dummy32, &ace->who_gid);
381 else
382 status = nfsd_map_name_to_uid(argp->rqstp,
383 buf, dummy32, &ace->who_uid);
384 if (status)
385 return status;
386 }
387 } else
388 *acl = NULL;
389 if (bmval[1] & FATTR4_WORD1_MODE) {
390 READ_BUF(4);
391 len += 4;
392 iattr->ia_mode = be32_to_cpup(p++);
393 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
394 iattr->ia_valid |= ATTR_MODE;
395 }
396 if (bmval[1] & FATTR4_WORD1_OWNER) {
397 READ_BUF(4);
398 len += 4;
399 dummy32 = be32_to_cpup(p++);
400 READ_BUF(dummy32);
401 len += (XDR_QUADLEN(dummy32) << 2);
402 READMEM(buf, dummy32);
403 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
404 return status;
405 iattr->ia_valid |= ATTR_UID;
406 }
407 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
408 READ_BUF(4);
409 len += 4;
410 dummy32 = be32_to_cpup(p++);
411 READ_BUF(dummy32);
412 len += (XDR_QUADLEN(dummy32) << 2);
413 READMEM(buf, dummy32);
414 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
415 return status;
416 iattr->ia_valid |= ATTR_GID;
417 }
418 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
419 READ_BUF(4);
420 len += 4;
421 dummy32 = be32_to_cpup(p++);
422 switch (dummy32) {
423 case NFS4_SET_TO_CLIENT_TIME:
424 len += 12;
425 status = nfsd4_decode_time(argp, &ts);
426 iattr->ia_atime = timespec_to_timespec64(ts);
427 if (status)
428 return status;
429 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
430 break;
431 case NFS4_SET_TO_SERVER_TIME:
432 iattr->ia_valid |= ATTR_ATIME;
433 break;
434 default:
435 goto xdr_error;
436 }
437 }
438 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
439 READ_BUF(4);
440 len += 4;
441 dummy32 = be32_to_cpup(p++);
442 switch (dummy32) {
443 case NFS4_SET_TO_CLIENT_TIME:
444 len += 12;
445 status = nfsd4_decode_time(argp, &ts);
446 iattr->ia_mtime = timespec_to_timespec64(ts);
447 if (status)
448 return status;
449 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
450 break;
451 case NFS4_SET_TO_SERVER_TIME:
452 iattr->ia_valid |= ATTR_MTIME;
453 break;
454 default:
455 goto xdr_error;
456 }
457 }
458
459 label->len = 0;
460 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
461 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
462 READ_BUF(4);
463 len += 4;
464 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
465 READ_BUF(4);
466 len += 4;
467 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
468 READ_BUF(4);
469 len += 4;
470 dummy32 = be32_to_cpup(p++);
471 READ_BUF(dummy32);
472 if (dummy32 > NFS4_MAXLABELLEN)
473 return nfserr_badlabel;
474 len += (XDR_QUADLEN(dummy32) << 2);
475 READMEM(buf, dummy32);
476 label->len = dummy32;
477 label->data = svcxdr_dupstr(argp, buf, dummy32);
478 if (!label->data)
479 return nfserr_jukebox;
480 }
481 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
482 if (!umask)
483 goto xdr_error;
484 READ_BUF(8);
485 len += 8;
486 dummy32 = be32_to_cpup(p++);
487 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
488 dummy32 = be32_to_cpup(p++);
489 *umask = dummy32 & S_IRWXUGO;
490 iattr->ia_valid |= ATTR_MODE;
491 }
492 if (len != expected_len)
493 goto xdr_error;
494
495 DECODE_TAIL;
496 }
497
498 static __be32
499 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
500 {
501 DECODE_HEAD;
502
503 READ_BUF(sizeof(stateid_t));
504 sid->si_generation = be32_to_cpup(p++);
505 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
506
507 DECODE_TAIL;
508 }
509
510 static __be32
511 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
512 {
513 DECODE_HEAD;
514
515 READ_BUF(4);
516 access->ac_req_access = be32_to_cpup(p++);
517
518 DECODE_TAIL;
519 }
520
521 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
522 {
523 DECODE_HEAD;
524 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
525 u32 dummy, uid, gid;
526 char *machine_name;
527 int i;
528 int nr_secflavs;
529
530 /* callback_sec_params4 */
531 READ_BUF(4);
532 nr_secflavs = be32_to_cpup(p++);
533 if (nr_secflavs)
534 cbs->flavor = (u32)(-1);
535 else
536 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
537 cbs->flavor = 0;
538 for (i = 0; i < nr_secflavs; ++i) {
539 READ_BUF(4);
540 dummy = be32_to_cpup(p++);
541 switch (dummy) {
542 case RPC_AUTH_NULL:
543 /* Nothing to read */
544 if (cbs->flavor == (u32)(-1))
545 cbs->flavor = RPC_AUTH_NULL;
546 break;
547 case RPC_AUTH_UNIX:
548 READ_BUF(8);
549 /* stamp */
550 dummy = be32_to_cpup(p++);
551
552 /* machine name */
553 dummy = be32_to_cpup(p++);
554 READ_BUF(dummy);
555 SAVEMEM(machine_name, dummy);
556
557 /* uid, gid */
558 READ_BUF(8);
559 uid = be32_to_cpup(p++);
560 gid = be32_to_cpup(p++);
561
562 /* more gids */
563 READ_BUF(4);
564 dummy = be32_to_cpup(p++);
565 READ_BUF(dummy * 4);
566 if (cbs->flavor == (u32)(-1)) {
567 kuid_t kuid = make_kuid(userns, uid);
568 kgid_t kgid = make_kgid(userns, gid);
569 if (uid_valid(kuid) && gid_valid(kgid)) {
570 cbs->uid = kuid;
571 cbs->gid = kgid;
572 cbs->flavor = RPC_AUTH_UNIX;
573 } else {
574 dprintk("RPC_AUTH_UNIX with invalid"
575 "uid or gid ignoring!\n");
576 }
577 }
578 break;
579 case RPC_AUTH_GSS:
580 dprintk("RPC_AUTH_GSS callback secflavor "
581 "not supported!\n");
582 READ_BUF(8);
583 /* gcbp_service */
584 dummy = be32_to_cpup(p++);
585 /* gcbp_handle_from_server */
586 dummy = be32_to_cpup(p++);
587 READ_BUF(dummy);
588 p += XDR_QUADLEN(dummy);
589 /* gcbp_handle_from_client */
590 READ_BUF(4);
591 dummy = be32_to_cpup(p++);
592 READ_BUF(dummy);
593 break;
594 default:
595 dprintk("Illegal callback secflavor\n");
596 return nfserr_inval;
597 }
598 }
599 DECODE_TAIL;
600 }
601
602 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
603 {
604 DECODE_HEAD;
605
606 READ_BUF(4);
607 bc->bc_cb_program = be32_to_cpup(p++);
608 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
609
610 DECODE_TAIL;
611 }
612
613 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
614 {
615 DECODE_HEAD;
616
617 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
618 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
619 bcts->dir = be32_to_cpup(p++);
620 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
621 * could help us figure out we should be using it. */
622 DECODE_TAIL;
623 }
624
625 static __be32
626 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
627 {
628 DECODE_HEAD;
629
630 READ_BUF(4);
631 close->cl_seqid = be32_to_cpup(p++);
632 return nfsd4_decode_stateid(argp, &close->cl_stateid);
633
634 DECODE_TAIL;
635 }
636
637
638 static __be32
639 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
640 {
641 DECODE_HEAD;
642
643 READ_BUF(12);
644 p = xdr_decode_hyper(p, &commit->co_offset);
645 commit->co_count = be32_to_cpup(p++);
646
647 DECODE_TAIL;
648 }
649
650 static __be32
651 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
652 {
653 DECODE_HEAD;
654
655 READ_BUF(4);
656 create->cr_type = be32_to_cpup(p++);
657 switch (create->cr_type) {
658 case NF4LNK:
659 READ_BUF(4);
660 create->cr_datalen = be32_to_cpup(p++);
661 READ_BUF(create->cr_datalen);
662 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
663 if (!create->cr_data)
664 return nfserr_jukebox;
665 break;
666 case NF4BLK:
667 case NF4CHR:
668 READ_BUF(8);
669 create->cr_specdata1 = be32_to_cpup(p++);
670 create->cr_specdata2 = be32_to_cpup(p++);
671 break;
672 case NF4SOCK:
673 case NF4FIFO:
674 case NF4DIR:
675 default:
676 break;
677 }
678
679 READ_BUF(4);
680 create->cr_namelen = be32_to_cpup(p++);
681 READ_BUF(create->cr_namelen);
682 SAVEMEM(create->cr_name, create->cr_namelen);
683 if ((status = check_filename(create->cr_name, create->cr_namelen)))
684 return status;
685
686 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
687 &create->cr_acl, &create->cr_label,
688 &create->cr_umask);
689 if (status)
690 goto out;
691
692 DECODE_TAIL;
693 }
694
695 static inline __be32
696 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
697 {
698 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
699 }
700
701 static inline __be32
702 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
703 {
704 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
705 }
706
707 static __be32
708 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
709 {
710 DECODE_HEAD;
711
712 READ_BUF(4);
713 link->li_namelen = be32_to_cpup(p++);
714 READ_BUF(link->li_namelen);
715 SAVEMEM(link->li_name, link->li_namelen);
716 if ((status = check_filename(link->li_name, link->li_namelen)))
717 return status;
718
719 DECODE_TAIL;
720 }
721
722 static __be32
723 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
724 {
725 DECODE_HEAD;
726
727 /*
728 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
729 */
730 READ_BUF(28);
731 lock->lk_type = be32_to_cpup(p++);
732 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
733 goto xdr_error;
734 lock->lk_reclaim = be32_to_cpup(p++);
735 p = xdr_decode_hyper(p, &lock->lk_offset);
736 p = xdr_decode_hyper(p, &lock->lk_length);
737 lock->lk_is_new = be32_to_cpup(p++);
738
739 if (lock->lk_is_new) {
740 READ_BUF(4);
741 lock->lk_new_open_seqid = be32_to_cpup(p++);
742 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
743 if (status)
744 return status;
745 READ_BUF(8 + sizeof(clientid_t));
746 lock->lk_new_lock_seqid = be32_to_cpup(p++);
747 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
748 lock->lk_new_owner.len = be32_to_cpup(p++);
749 READ_BUF(lock->lk_new_owner.len);
750 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
751 } else {
752 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
753 if (status)
754 return status;
755 READ_BUF(4);
756 lock->lk_old_lock_seqid = be32_to_cpup(p++);
757 }
758
759 DECODE_TAIL;
760 }
761
762 static __be32
763 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
764 {
765 DECODE_HEAD;
766
767 READ_BUF(32);
768 lockt->lt_type = be32_to_cpup(p++);
769 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
770 goto xdr_error;
771 p = xdr_decode_hyper(p, &lockt->lt_offset);
772 p = xdr_decode_hyper(p, &lockt->lt_length);
773 COPYMEM(&lockt->lt_clientid, 8);
774 lockt->lt_owner.len = be32_to_cpup(p++);
775 READ_BUF(lockt->lt_owner.len);
776 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
777
778 DECODE_TAIL;
779 }
780
781 static __be32
782 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
783 {
784 DECODE_HEAD;
785
786 READ_BUF(8);
787 locku->lu_type = be32_to_cpup(p++);
788 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
789 goto xdr_error;
790 locku->lu_seqid = be32_to_cpup(p++);
791 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
792 if (status)
793 return status;
794 READ_BUF(16);
795 p = xdr_decode_hyper(p, &locku->lu_offset);
796 p = xdr_decode_hyper(p, &locku->lu_length);
797
798 DECODE_TAIL;
799 }
800
801 static __be32
802 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
803 {
804 DECODE_HEAD;
805
806 READ_BUF(4);
807 lookup->lo_len = be32_to_cpup(p++);
808 READ_BUF(lookup->lo_len);
809 SAVEMEM(lookup->lo_name, lookup->lo_len);
810 if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
811 return status;
812
813 DECODE_TAIL;
814 }
815
816 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
817 {
818 __be32 *p;
819 u32 w;
820
821 READ_BUF(4);
822 w = be32_to_cpup(p++);
823 *share_access = w & NFS4_SHARE_ACCESS_MASK;
824 *deleg_want = w & NFS4_SHARE_WANT_MASK;
825 if (deleg_when)
826 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
827
828 switch (w & NFS4_SHARE_ACCESS_MASK) {
829 case NFS4_SHARE_ACCESS_READ:
830 case NFS4_SHARE_ACCESS_WRITE:
831 case NFS4_SHARE_ACCESS_BOTH:
832 break;
833 default:
834 return nfserr_bad_xdr;
835 }
836 w &= ~NFS4_SHARE_ACCESS_MASK;
837 if (!w)
838 return nfs_ok;
839 if (!argp->minorversion)
840 return nfserr_bad_xdr;
841 switch (w & NFS4_SHARE_WANT_MASK) {
842 case NFS4_SHARE_WANT_NO_PREFERENCE:
843 case NFS4_SHARE_WANT_READ_DELEG:
844 case NFS4_SHARE_WANT_WRITE_DELEG:
845 case NFS4_SHARE_WANT_ANY_DELEG:
846 case NFS4_SHARE_WANT_NO_DELEG:
847 case NFS4_SHARE_WANT_CANCEL:
848 break;
849 default:
850 return nfserr_bad_xdr;
851 }
852 w &= ~NFS4_SHARE_WANT_MASK;
853 if (!w)
854 return nfs_ok;
855
856 if (!deleg_when) /* open_downgrade */
857 return nfserr_inval;
858 switch (w) {
859 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
860 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
861 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
862 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
863 return nfs_ok;
864 }
865 xdr_error:
866 return nfserr_bad_xdr;
867 }
868
869 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
870 {
871 __be32 *p;
872
873 READ_BUF(4);
874 *x = be32_to_cpup(p++);
875 /* Note: unlinke access bits, deny bits may be zero. */
876 if (*x & ~NFS4_SHARE_DENY_BOTH)
877 return nfserr_bad_xdr;
878 return nfs_ok;
879 xdr_error:
880 return nfserr_bad_xdr;
881 }
882
883 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
884 {
885 __be32 *p;
886
887 READ_BUF(4);
888 o->len = be32_to_cpup(p++);
889
890 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
891 return nfserr_bad_xdr;
892
893 READ_BUF(o->len);
894 SAVEMEM(o->data, o->len);
895 return nfs_ok;
896 xdr_error:
897 return nfserr_bad_xdr;
898 }
899
900 static __be32
901 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
902 {
903 DECODE_HEAD;
904 u32 dummy;
905
906 memset(open->op_bmval, 0, sizeof(open->op_bmval));
907 open->op_iattr.ia_valid = 0;
908 open->op_openowner = NULL;
909
910 open->op_xdr_error = 0;
911 /* seqid, share_access, share_deny, clientid, ownerlen */
912 READ_BUF(4);
913 open->op_seqid = be32_to_cpup(p++);
914 /* decode, yet ignore deleg_when until supported */
915 status = nfsd4_decode_share_access(argp, &open->op_share_access,
916 &open->op_deleg_want, &dummy);
917 if (status)
918 goto xdr_error;
919 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
920 if (status)
921 goto xdr_error;
922 READ_BUF(sizeof(clientid_t));
923 COPYMEM(&open->op_clientid, sizeof(clientid_t));
924 status = nfsd4_decode_opaque(argp, &open->op_owner);
925 if (status)
926 goto xdr_error;
927 READ_BUF(4);
928 open->op_create = be32_to_cpup(p++);
929 switch (open->op_create) {
930 case NFS4_OPEN_NOCREATE:
931 break;
932 case NFS4_OPEN_CREATE:
933 READ_BUF(4);
934 open->op_createmode = be32_to_cpup(p++);
935 switch (open->op_createmode) {
936 case NFS4_CREATE_UNCHECKED:
937 case NFS4_CREATE_GUARDED:
938 status = nfsd4_decode_fattr(argp, open->op_bmval,
939 &open->op_iattr, &open->op_acl, &open->op_label,
940 &open->op_umask);
941 if (status)
942 goto out;
943 break;
944 case NFS4_CREATE_EXCLUSIVE:
945 READ_BUF(NFS4_VERIFIER_SIZE);
946 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
947 break;
948 case NFS4_CREATE_EXCLUSIVE4_1:
949 if (argp->minorversion < 1)
950 goto xdr_error;
951 READ_BUF(NFS4_VERIFIER_SIZE);
952 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
953 status = nfsd4_decode_fattr(argp, open->op_bmval,
954 &open->op_iattr, &open->op_acl, &open->op_label,
955 &open->op_umask);
956 if (status)
957 goto out;
958 break;
959 default:
960 goto xdr_error;
961 }
962 break;
963 default:
964 goto xdr_error;
965 }
966
967 /* open_claim */
968 READ_BUF(4);
969 open->op_claim_type = be32_to_cpup(p++);
970 switch (open->op_claim_type) {
971 case NFS4_OPEN_CLAIM_NULL:
972 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
973 READ_BUF(4);
974 open->op_fname.len = be32_to_cpup(p++);
975 READ_BUF(open->op_fname.len);
976 SAVEMEM(open->op_fname.data, open->op_fname.len);
977 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
978 return status;
979 break;
980 case NFS4_OPEN_CLAIM_PREVIOUS:
981 READ_BUF(4);
982 open->op_delegate_type = be32_to_cpup(p++);
983 break;
984 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
985 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
986 if (status)
987 return status;
988 READ_BUF(4);
989 open->op_fname.len = be32_to_cpup(p++);
990 READ_BUF(open->op_fname.len);
991 SAVEMEM(open->op_fname.data, open->op_fname.len);
992 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
993 return status;
994 break;
995 case NFS4_OPEN_CLAIM_FH:
996 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
997 if (argp->minorversion < 1)
998 goto xdr_error;
999 /* void */
1000 break;
1001 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1002 if (argp->minorversion < 1)
1003 goto xdr_error;
1004 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1005 if (status)
1006 return status;
1007 break;
1008 default:
1009 goto xdr_error;
1010 }
1011
1012 DECODE_TAIL;
1013 }
1014
1015 static __be32
1016 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1017 {
1018 DECODE_HEAD;
1019
1020 if (argp->minorversion >= 1)
1021 return nfserr_notsupp;
1022
1023 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1024 if (status)
1025 return status;
1026 READ_BUF(4);
1027 open_conf->oc_seqid = be32_to_cpup(p++);
1028
1029 DECODE_TAIL;
1030 }
1031
1032 static __be32
1033 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1034 {
1035 DECODE_HEAD;
1036
1037 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1038 if (status)
1039 return status;
1040 READ_BUF(4);
1041 open_down->od_seqid = be32_to_cpup(p++);
1042 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1043 &open_down->od_deleg_want, NULL);
1044 if (status)
1045 return status;
1046 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1047 if (status)
1048 return status;
1049 DECODE_TAIL;
1050 }
1051
1052 static __be32
1053 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1054 {
1055 DECODE_HEAD;
1056
1057 READ_BUF(4);
1058 putfh->pf_fhlen = be32_to_cpup(p++);
1059 if (putfh->pf_fhlen > NFS4_FHSIZE)
1060 goto xdr_error;
1061 READ_BUF(putfh->pf_fhlen);
1062 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1063
1064 DECODE_TAIL;
1065 }
1066
1067 static __be32
1068 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1069 {
1070 if (argp->minorversion == 0)
1071 return nfs_ok;
1072 return nfserr_notsupp;
1073 }
1074
1075 static __be32
1076 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1077 {
1078 DECODE_HEAD;
1079
1080 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1081 if (status)
1082 return status;
1083 READ_BUF(12);
1084 p = xdr_decode_hyper(p, &read->rd_offset);
1085 read->rd_length = be32_to_cpup(p++);
1086
1087 DECODE_TAIL;
1088 }
1089
1090 static __be32
1091 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1092 {
1093 DECODE_HEAD;
1094
1095 READ_BUF(24);
1096 p = xdr_decode_hyper(p, &readdir->rd_cookie);
1097 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1098 readdir->rd_dircount = be32_to_cpup(p++);
1099 readdir->rd_maxcount = be32_to_cpup(p++);
1100 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1101 goto out;
1102
1103 DECODE_TAIL;
1104 }
1105
1106 static __be32
1107 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1108 {
1109 DECODE_HEAD;
1110
1111 READ_BUF(4);
1112 remove->rm_namelen = be32_to_cpup(p++);
1113 READ_BUF(remove->rm_namelen);
1114 SAVEMEM(remove->rm_name, remove->rm_namelen);
1115 if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1116 return status;
1117
1118 DECODE_TAIL;
1119 }
1120
1121 static __be32
1122 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1123 {
1124 DECODE_HEAD;
1125
1126 READ_BUF(4);
1127 rename->rn_snamelen = be32_to_cpup(p++);
1128 READ_BUF(rename->rn_snamelen);
1129 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1130 READ_BUF(4);
1131 rename->rn_tnamelen = be32_to_cpup(p++);
1132 READ_BUF(rename->rn_tnamelen);
1133 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1134 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1135 return status;
1136 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1137 return status;
1138
1139 DECODE_TAIL;
1140 }
1141
1142 static __be32
1143 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1144 {
1145 DECODE_HEAD;
1146
1147 if (argp->minorversion >= 1)
1148 return nfserr_notsupp;
1149
1150 READ_BUF(sizeof(clientid_t));
1151 COPYMEM(clientid, sizeof(clientid_t));
1152
1153 DECODE_TAIL;
1154 }
1155
1156 static __be32
1157 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1158 struct nfsd4_secinfo *secinfo)
1159 {
1160 DECODE_HEAD;
1161
1162 READ_BUF(4);
1163 secinfo->si_namelen = be32_to_cpup(p++);
1164 READ_BUF(secinfo->si_namelen);
1165 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1166 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1167 if (status)
1168 return status;
1169 DECODE_TAIL;
1170 }
1171
1172 static __be32
1173 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1174 struct nfsd4_secinfo_no_name *sin)
1175 {
1176 DECODE_HEAD;
1177
1178 READ_BUF(4);
1179 sin->sin_style = be32_to_cpup(p++);
1180 DECODE_TAIL;
1181 }
1182
1183 static __be32
1184 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1185 {
1186 __be32 status;
1187
1188 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1189 if (status)
1190 return status;
1191 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1192 &setattr->sa_acl, &setattr->sa_label, NULL);
1193 }
1194
1195 static __be32
1196 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1197 {
1198 DECODE_HEAD;
1199
1200 if (argp->minorversion >= 1)
1201 return nfserr_notsupp;
1202
1203 READ_BUF(NFS4_VERIFIER_SIZE);
1204 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1205
1206 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1207 if (status)
1208 return nfserr_bad_xdr;
1209 READ_BUF(8);
1210 setclientid->se_callback_prog = be32_to_cpup(p++);
1211 setclientid->se_callback_netid_len = be32_to_cpup(p++);
1212 READ_BUF(setclientid->se_callback_netid_len);
1213 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1214 READ_BUF(4);
1215 setclientid->se_callback_addr_len = be32_to_cpup(p++);
1216
1217 READ_BUF(setclientid->se_callback_addr_len);
1218 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1219 READ_BUF(4);
1220 setclientid->se_callback_ident = be32_to_cpup(p++);
1221
1222 DECODE_TAIL;
1223 }
1224
1225 static __be32
1226 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1227 {
1228 DECODE_HEAD;
1229
1230 if (argp->minorversion >= 1)
1231 return nfserr_notsupp;
1232
1233 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1234 COPYMEM(&scd_c->sc_clientid, 8);
1235 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1236
1237 DECODE_TAIL;
1238 }
1239
1240 /* Also used for NVERIFY */
1241 static __be32
1242 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1243 {
1244 DECODE_HEAD;
1245
1246 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1247 goto out;
1248
1249 /* For convenience's sake, we compare raw xdr'd attributes in
1250 * nfsd4_proc_verify */
1251
1252 READ_BUF(4);
1253 verify->ve_attrlen = be32_to_cpup(p++);
1254 READ_BUF(verify->ve_attrlen);
1255 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1256
1257 DECODE_TAIL;
1258 }
1259
1260 static __be32
1261 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1262 {
1263 int avail;
1264 int len;
1265 DECODE_HEAD;
1266
1267 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1268 if (status)
1269 return status;
1270 READ_BUF(16);
1271 p = xdr_decode_hyper(p, &write->wr_offset);
1272 write->wr_stable_how = be32_to_cpup(p++);
1273 if (write->wr_stable_how > NFS_FILE_SYNC)
1274 goto xdr_error;
1275 write->wr_buflen = be32_to_cpup(p++);
1276
1277 /* Sorry .. no magic macros for this.. *
1278 * READ_BUF(write->wr_buflen);
1279 * SAVEMEM(write->wr_buf, write->wr_buflen);
1280 */
1281 avail = (char*)argp->end - (char*)argp->p;
1282 if (avail + argp->pagelen < write->wr_buflen) {
1283 dprintk("NFSD: xdr error (%s:%d)\n",
1284 __FILE__, __LINE__);
1285 goto xdr_error;
1286 }
1287 write->wr_head.iov_base = p;
1288 write->wr_head.iov_len = avail;
1289 write->wr_pagelist = argp->pagelist;
1290
1291 len = XDR_QUADLEN(write->wr_buflen) << 2;
1292 if (len >= avail) {
1293 int pages;
1294
1295 len -= avail;
1296
1297 pages = len >> PAGE_SHIFT;
1298 argp->pagelist += pages;
1299 argp->pagelen -= pages * PAGE_SIZE;
1300 len -= pages * PAGE_SIZE;
1301
1302 next_decode_page(argp);
1303 }
1304 argp->p += XDR_QUADLEN(len);
1305
1306 DECODE_TAIL;
1307 }
1308
1309 static __be32
1310 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1311 {
1312 DECODE_HEAD;
1313
1314 if (argp->minorversion >= 1)
1315 return nfserr_notsupp;
1316
1317 READ_BUF(12);
1318 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1319 rlockowner->rl_owner.len = be32_to_cpup(p++);
1320 READ_BUF(rlockowner->rl_owner.len);
1321 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1322
1323 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1324 return nfserr_inval;
1325 DECODE_TAIL;
1326 }
1327
1328 static __be32
1329 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1330 struct nfsd4_exchange_id *exid)
1331 {
1332 int dummy, tmp;
1333 DECODE_HEAD;
1334
1335 READ_BUF(NFS4_VERIFIER_SIZE);
1336 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1337
1338 status = nfsd4_decode_opaque(argp, &exid->clname);
1339 if (status)
1340 return nfserr_bad_xdr;
1341
1342 READ_BUF(4);
1343 exid->flags = be32_to_cpup(p++);
1344
1345 /* Ignore state_protect4_a */
1346 READ_BUF(4);
1347 exid->spa_how = be32_to_cpup(p++);
1348 switch (exid->spa_how) {
1349 case SP4_NONE:
1350 break;
1351 case SP4_MACH_CRED:
1352 /* spo_must_enforce */
1353 status = nfsd4_decode_bitmap(argp,
1354 exid->spo_must_enforce);
1355 if (status)
1356 goto out;
1357 /* spo_must_allow */
1358 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1359 if (status)
1360 goto out;
1361 break;
1362 case SP4_SSV:
1363 /* ssp_ops */
1364 READ_BUF(4);
1365 dummy = be32_to_cpup(p++);
1366 READ_BUF(dummy * 4);
1367 p += dummy;
1368
1369 READ_BUF(4);
1370 dummy = be32_to_cpup(p++);
1371 READ_BUF(dummy * 4);
1372 p += dummy;
1373
1374 /* ssp_hash_algs<> */
1375 READ_BUF(4);
1376 tmp = be32_to_cpup(p++);
1377 while (tmp--) {
1378 READ_BUF(4);
1379 dummy = be32_to_cpup(p++);
1380 READ_BUF(dummy);
1381 p += XDR_QUADLEN(dummy);
1382 }
1383
1384 /* ssp_encr_algs<> */
1385 READ_BUF(4);
1386 tmp = be32_to_cpup(p++);
1387 while (tmp--) {
1388 READ_BUF(4);
1389 dummy = be32_to_cpup(p++);
1390 READ_BUF(dummy);
1391 p += XDR_QUADLEN(dummy);
1392 }
1393
1394 /* ignore ssp_window and ssp_num_gss_handles: */
1395 READ_BUF(8);
1396 break;
1397 default:
1398 goto xdr_error;
1399 }
1400
1401 /* Ignore Implementation ID */
1402 READ_BUF(4); /* nfs_impl_id4 array length */
1403 dummy = be32_to_cpup(p++);
1404
1405 if (dummy > 1)
1406 goto xdr_error;
1407
1408 if (dummy == 1) {
1409 /* nii_domain */
1410 READ_BUF(4);
1411 dummy = be32_to_cpup(p++);
1412 READ_BUF(dummy);
1413 p += XDR_QUADLEN(dummy);
1414
1415 /* nii_name */
1416 READ_BUF(4);
1417 dummy = be32_to_cpup(p++);
1418 READ_BUF(dummy);
1419 p += XDR_QUADLEN(dummy);
1420
1421 /* nii_date */
1422 READ_BUF(12);
1423 p += 3;
1424 }
1425 DECODE_TAIL;
1426 }
1427
1428 static __be32
1429 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1430 struct nfsd4_create_session *sess)
1431 {
1432 DECODE_HEAD;
1433 u32 dummy;
1434
1435 READ_BUF(16);
1436 COPYMEM(&sess->clientid, 8);
1437 sess->seqid = be32_to_cpup(p++);
1438 sess->flags = be32_to_cpup(p++);
1439
1440 /* Fore channel attrs */
1441 READ_BUF(28);
1442 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1443 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1444 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1445 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1446 sess->fore_channel.maxops = be32_to_cpup(p++);
1447 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1448 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1449 if (sess->fore_channel.nr_rdma_attrs == 1) {
1450 READ_BUF(4);
1451 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1452 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1453 dprintk("Too many fore channel attr bitmaps!\n");
1454 goto xdr_error;
1455 }
1456
1457 /* Back channel attrs */
1458 READ_BUF(28);
1459 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1460 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1461 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1462 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1463 sess->back_channel.maxops = be32_to_cpup(p++);
1464 sess->back_channel.maxreqs = be32_to_cpup(p++);
1465 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1466 if (sess->back_channel.nr_rdma_attrs == 1) {
1467 READ_BUF(4);
1468 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1469 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1470 dprintk("Too many back channel attr bitmaps!\n");
1471 goto xdr_error;
1472 }
1473
1474 READ_BUF(4);
1475 sess->callback_prog = be32_to_cpup(p++);
1476 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1477 DECODE_TAIL;
1478 }
1479
1480 static __be32
1481 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1482 struct nfsd4_destroy_session *destroy_session)
1483 {
1484 DECODE_HEAD;
1485 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1486 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1487
1488 DECODE_TAIL;
1489 }
1490
1491 static __be32
1492 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1493 struct nfsd4_free_stateid *free_stateid)
1494 {
1495 DECODE_HEAD;
1496
1497 READ_BUF(sizeof(stateid_t));
1498 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1499 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1500
1501 DECODE_TAIL;
1502 }
1503
1504 static __be32
1505 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1506 struct nfsd4_sequence *seq)
1507 {
1508 DECODE_HEAD;
1509
1510 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1511 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1512 seq->seqid = be32_to_cpup(p++);
1513 seq->slotid = be32_to_cpup(p++);
1514 seq->maxslots = be32_to_cpup(p++);
1515 seq->cachethis = be32_to_cpup(p++);
1516
1517 DECODE_TAIL;
1518 }
1519
1520 static __be32
1521 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1522 {
1523 int i;
1524 __be32 *p, status;
1525 struct nfsd4_test_stateid_id *stateid;
1526
1527 READ_BUF(4);
1528 test_stateid->ts_num_ids = ntohl(*p++);
1529
1530 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1531
1532 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1533 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1534 if (!stateid) {
1535 status = nfserrno(-ENOMEM);
1536 goto out;
1537 }
1538
1539 INIT_LIST_HEAD(&stateid->ts_id_list);
1540 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1541
1542 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1543 if (status)
1544 goto out;
1545 }
1546
1547 status = 0;
1548 out:
1549 return status;
1550 xdr_error:
1551 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1552 status = nfserr_bad_xdr;
1553 goto out;
1554 }
1555
1556 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1557 {
1558 DECODE_HEAD;
1559
1560 READ_BUF(8);
1561 COPYMEM(&dc->clientid, 8);
1562
1563 DECODE_TAIL;
1564 }
1565
1566 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1567 {
1568 DECODE_HEAD;
1569
1570 READ_BUF(4);
1571 rc->rca_one_fs = be32_to_cpup(p++);
1572
1573 DECODE_TAIL;
1574 }
1575
1576 #ifdef CONFIG_NFSD_PNFS
1577 static __be32
1578 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1579 struct nfsd4_getdeviceinfo *gdev)
1580 {
1581 DECODE_HEAD;
1582 u32 num, i;
1583
1584 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1585 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1586 gdev->gd_layout_type = be32_to_cpup(p++);
1587 gdev->gd_maxcount = be32_to_cpup(p++);
1588 num = be32_to_cpup(p++);
1589 if (num) {
1590 if (num > 1000)
1591 goto xdr_error;
1592 READ_BUF(4 * num);
1593 gdev->gd_notify_types = be32_to_cpup(p++);
1594 for (i = 1; i < num; i++) {
1595 if (be32_to_cpup(p++)) {
1596 status = nfserr_inval;
1597 goto out;
1598 }
1599 }
1600 }
1601 DECODE_TAIL;
1602 }
1603
1604 static __be32
1605 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1606 struct nfsd4_layoutget *lgp)
1607 {
1608 DECODE_HEAD;
1609
1610 READ_BUF(36);
1611 lgp->lg_signal = be32_to_cpup(p++);
1612 lgp->lg_layout_type = be32_to_cpup(p++);
1613 lgp->lg_seg.iomode = be32_to_cpup(p++);
1614 p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1615 p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1616 p = xdr_decode_hyper(p, &lgp->lg_minlength);
1617
1618 status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1619 if (status)
1620 return status;
1621
1622 READ_BUF(4);
1623 lgp->lg_maxcount = be32_to_cpup(p++);
1624
1625 DECODE_TAIL;
1626 }
1627
1628 static __be32
1629 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1630 struct nfsd4_layoutcommit *lcp)
1631 {
1632 DECODE_HEAD;
1633 u32 timechange;
1634
1635 READ_BUF(20);
1636 p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1637 p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1638 lcp->lc_reclaim = be32_to_cpup(p++);
1639
1640 status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1641 if (status)
1642 return status;
1643
1644 READ_BUF(4);
1645 lcp->lc_newoffset = be32_to_cpup(p++);
1646 if (lcp->lc_newoffset) {
1647 READ_BUF(8);
1648 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1649 } else
1650 lcp->lc_last_wr = 0;
1651 READ_BUF(4);
1652 timechange = be32_to_cpup(p++);
1653 if (timechange) {
1654 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1655 if (status)
1656 return status;
1657 } else {
1658 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1659 }
1660 READ_BUF(8);
1661 lcp->lc_layout_type = be32_to_cpup(p++);
1662
1663 /*
1664 * Save the layout update in XDR format and let the layout driver deal
1665 * with it later.
1666 */
1667 lcp->lc_up_len = be32_to_cpup(p++);
1668 if (lcp->lc_up_len > 0) {
1669 READ_BUF(lcp->lc_up_len);
1670 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1671 }
1672
1673 DECODE_TAIL;
1674 }
1675
1676 static __be32
1677 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1678 struct nfsd4_layoutreturn *lrp)
1679 {
1680 DECODE_HEAD;
1681
1682 READ_BUF(16);
1683 lrp->lr_reclaim = be32_to_cpup(p++);
1684 lrp->lr_layout_type = be32_to_cpup(p++);
1685 lrp->lr_seg.iomode = be32_to_cpup(p++);
1686 lrp->lr_return_type = be32_to_cpup(p++);
1687 if (lrp->lr_return_type == RETURN_FILE) {
1688 READ_BUF(16);
1689 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1690 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1691
1692 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1693 if (status)
1694 return status;
1695
1696 READ_BUF(4);
1697 lrp->lrf_body_len = be32_to_cpup(p++);
1698 if (lrp->lrf_body_len > 0) {
1699 READ_BUF(lrp->lrf_body_len);
1700 READMEM(lrp->lrf_body, lrp->lrf_body_len);
1701 }
1702 } else {
1703 lrp->lr_seg.offset = 0;
1704 lrp->lr_seg.length = NFS4_MAX_UINT64;
1705 }
1706
1707 DECODE_TAIL;
1708 }
1709 #endif /* CONFIG_NFSD_PNFS */
1710
1711 static __be32
1712 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1713 struct nfsd4_fallocate *fallocate)
1714 {
1715 DECODE_HEAD;
1716
1717 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1718 if (status)
1719 return status;
1720
1721 READ_BUF(16);
1722 p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1723 xdr_decode_hyper(p, &fallocate->falloc_length);
1724
1725 DECODE_TAIL;
1726 }
1727
1728 static __be32
1729 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1730 {
1731 DECODE_HEAD;
1732
1733 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1734 if (status)
1735 return status;
1736 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1737 if (status)
1738 return status;
1739
1740 READ_BUF(8 + 8 + 8);
1741 p = xdr_decode_hyper(p, &clone->cl_src_pos);
1742 p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1743 p = xdr_decode_hyper(p, &clone->cl_count);
1744 DECODE_TAIL;
1745 }
1746
1747 static __be32
1748 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1749 {
1750 DECODE_HEAD;
1751 unsigned int tmp;
1752
1753 status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1754 if (status)
1755 return status;
1756 status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1757 if (status)
1758 return status;
1759
1760 READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1761 p = xdr_decode_hyper(p, &copy->cp_src_pos);
1762 p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1763 p = xdr_decode_hyper(p, &copy->cp_count);
1764 p++; /* ca_consecutive: we always do consecutive copies */
1765 copy->cp_synchronous = be32_to_cpup(p++);
1766 tmp = be32_to_cpup(p); /* Source server list not supported */
1767
1768 DECODE_TAIL;
1769 }
1770
1771 static __be32
1772 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
1773 struct nfsd4_offload_status *os)
1774 {
1775 return nfsd4_decode_stateid(argp, &os->stateid);
1776 }
1777
1778 static __be32
1779 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1780 {
1781 DECODE_HEAD;
1782
1783 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1784 if (status)
1785 return status;
1786
1787 READ_BUF(8 + 4);
1788 p = xdr_decode_hyper(p, &seek->seek_offset);
1789 seek->seek_whence = be32_to_cpup(p);
1790
1791 DECODE_TAIL;
1792 }
1793
1794 static __be32
1795 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1796 {
1797 return nfs_ok;
1798 }
1799
1800 static __be32
1801 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1802 {
1803 return nfserr_notsupp;
1804 }
1805
1806 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1807
1808 static const nfsd4_dec nfsd4_dec_ops[] = {
1809 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1810 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1811 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1812 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1813 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1814 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1815 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1816 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1817 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1818 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1819 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1820 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1821 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1822 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1823 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1824 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1825 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1826 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1827 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1828 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1829 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1830 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1831 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1832 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1833 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1834 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1835 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1836 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1837 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1838 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1839 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1840 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1841 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1842 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1843 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1844 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1845 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1846
1847 /* new operations for NFSv4.1 */
1848 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1849 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1850 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1851 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1852 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1853 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1854 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1855 #ifdef CONFIG_NFSD_PNFS
1856 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1857 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1858 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit,
1859 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget,
1860 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn,
1861 #else
1862 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1863 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1864 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1865 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1866 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1867 #endif
1868 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1869 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1870 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1871 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1872 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1873 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1874 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1875
1876 /* new operations for NFSv4.2 */
1877 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1878 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy,
1879 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
1880 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1881 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
1882 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
1883 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
1884 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_offload_status,
1885 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_offload_status,
1886 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1887 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
1888 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
1889 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone,
1890 };
1891
1892 static inline bool
1893 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1894 {
1895 if (op->opnum < FIRST_NFS4_OP)
1896 return false;
1897 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1898 return false;
1899 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1900 return false;
1901 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1902 return false;
1903 return true;
1904 }
1905
1906 static __be32
1907 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1908 {
1909 DECODE_HEAD;
1910 struct nfsd4_op *op;
1911 bool cachethis = false;
1912 int auth_slack= argp->rqstp->rq_auth_slack;
1913 int max_reply = auth_slack + 8; /* opcnt, status */
1914 int readcount = 0;
1915 int readbytes = 0;
1916 int i;
1917
1918 READ_BUF(4);
1919 argp->taglen = be32_to_cpup(p++);
1920 READ_BUF(argp->taglen);
1921 SAVEMEM(argp->tag, argp->taglen);
1922 READ_BUF(8);
1923 argp->minorversion = be32_to_cpup(p++);
1924 argp->opcnt = be32_to_cpup(p++);
1925 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1926
1927 if (argp->taglen > NFSD4_MAX_TAGLEN)
1928 goto xdr_error;
1929 /*
1930 * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
1931 * here, so we return success at the xdr level so that
1932 * nfsd4_proc can handle this is an NFS-level error.
1933 */
1934 if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1935 return 0;
1936
1937 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1938 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1939 if (!argp->ops) {
1940 argp->ops = argp->iops;
1941 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1942 goto xdr_error;
1943 }
1944 }
1945
1946 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1947 argp->opcnt = 0;
1948
1949 for (i = 0; i < argp->opcnt; i++) {
1950 op = &argp->ops[i];
1951 op->replay = NULL;
1952
1953 READ_BUF(4);
1954 op->opnum = be32_to_cpup(p++);
1955
1956 if (nfsd4_opnum_in_range(argp, op))
1957 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1958 else {
1959 op->opnum = OP_ILLEGAL;
1960 op->status = nfserr_op_illegal;
1961 }
1962 op->opdesc = OPDESC(op);
1963 /*
1964 * We'll try to cache the result in the DRC if any one
1965 * op in the compound wants to be cached:
1966 */
1967 cachethis |= nfsd4_cache_this_op(op);
1968
1969 if (op->opnum == OP_READ) {
1970 readcount++;
1971 readbytes += nfsd4_max_reply(argp->rqstp, op);
1972 } else
1973 max_reply += nfsd4_max_reply(argp->rqstp, op);
1974 /*
1975 * OP_LOCK and OP_LOCKT may return a conflicting lock.
1976 * (Special case because it will just skip encoding this
1977 * if it runs out of xdr buffer space, and it is the only
1978 * operation that behaves this way.)
1979 */
1980 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1981 max_reply += NFS4_OPAQUE_LIMIT;
1982
1983 if (op->status) {
1984 argp->opcnt = i+1;
1985 break;
1986 }
1987 }
1988 /* Sessions make the DRC unnecessary: */
1989 if (argp->minorversion)
1990 cachethis = false;
1991 svc_reserve(argp->rqstp, max_reply + readbytes);
1992 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1993
1994 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1995 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1996
1997 DECODE_TAIL;
1998 }
1999
2000 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
2001 struct svc_export *exp)
2002 {
2003 if (exp->ex_flags & NFSEXP_V4ROOT) {
2004 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
2005 *p++ = 0;
2006 } else if (IS_I_VERSION(inode)) {
2007 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2008 } else {
2009 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2010 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2011 }
2012 return p;
2013 }
2014
2015 /*
2016 * ctime (in NFSv4, time_metadata) is not writeable, and the client
2017 * doesn't really care what resolution could theoretically be stored by
2018 * the filesystem.
2019 *
2020 * The client cares how close together changes can be while still
2021 * guaranteeing ctime changes. For most filesystems (which have
2022 * timestamps with nanosecond fields) that is limited by the resolution
2023 * of the time returned from current_time() (which I'm assuming to be
2024 * 1/HZ).
2025 */
2026 static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2027 {
2028 struct timespec ts;
2029 u32 ns;
2030
2031 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2032 ts = ns_to_timespec(ns);
2033
2034 p = xdr_encode_hyper(p, ts.tv_sec);
2035 *p++ = cpu_to_be32(ts.tv_nsec);
2036
2037 return p;
2038 }
2039
2040 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2041 {
2042 *p++ = cpu_to_be32(c->atomic);
2043 if (c->change_supported) {
2044 p = xdr_encode_hyper(p, c->before_change);
2045 p = xdr_encode_hyper(p, c->after_change);
2046 } else {
2047 *p++ = cpu_to_be32(c->before_ctime_sec);
2048 *p++ = cpu_to_be32(c->before_ctime_nsec);
2049 *p++ = cpu_to_be32(c->after_ctime_sec);
2050 *p++ = cpu_to_be32(c->after_ctime_nsec);
2051 }
2052 return p;
2053 }
2054
2055 /* Encode as an array of strings the string given with components
2056 * separated @sep, escaped with esc_enter and esc_exit.
2057 */
2058 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2059 char *components, char esc_enter,
2060 char esc_exit)
2061 {
2062 __be32 *p;
2063 __be32 pathlen;
2064 int pathlen_offset;
2065 int strlen, count=0;
2066 char *str, *end, *next;
2067
2068 dprintk("nfsd4_encode_components(%s)\n", components);
2069
2070 pathlen_offset = xdr->buf->len;
2071 p = xdr_reserve_space(xdr, 4);
2072 if (!p)
2073 return nfserr_resource;
2074 p++; /* We will fill this in with @count later */
2075
2076 end = str = components;
2077 while (*end) {
2078 bool found_esc = false;
2079
2080 /* try to parse as esc_start, ..., esc_end, sep */
2081 if (*str == esc_enter) {
2082 for (; *end && (*end != esc_exit); end++)
2083 /* find esc_exit or end of string */;
2084 next = end + 1;
2085 if (*end && (!*next || *next == sep)) {
2086 str++;
2087 found_esc = true;
2088 }
2089 }
2090
2091 if (!found_esc)
2092 for (; *end && (*end != sep); end++)
2093 /* find sep or end of string */;
2094
2095 strlen = end - str;
2096 if (strlen) {
2097 p = xdr_reserve_space(xdr, strlen + 4);
2098 if (!p)
2099 return nfserr_resource;
2100 p = xdr_encode_opaque(p, str, strlen);
2101 count++;
2102 }
2103 else
2104 end++;
2105 if (found_esc)
2106 end = next;
2107
2108 str = end;
2109 }
2110 pathlen = htonl(count);
2111 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2112 return 0;
2113 }
2114
2115 /* Encode as an array of strings the string given with components
2116 * separated @sep.
2117 */
2118 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2119 char *components)
2120 {
2121 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2122 }
2123
2124 /*
2125 * encode a location element of a fs_locations structure
2126 */
2127 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2128 struct nfsd4_fs_location *location)
2129 {
2130 __be32 status;
2131
2132 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2133 '[', ']');
2134 if (status)
2135 return status;
2136 status = nfsd4_encode_components(xdr, '/', location->path);
2137 if (status)
2138 return status;
2139 return 0;
2140 }
2141
2142 /*
2143 * Encode a path in RFC3530 'pathname4' format
2144 */
2145 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2146 const struct path *root,
2147 const struct path *path)
2148 {
2149 struct path cur = *path;
2150 __be32 *p;
2151 struct dentry **components = NULL;
2152 unsigned int ncomponents = 0;
2153 __be32 err = nfserr_jukebox;
2154
2155 dprintk("nfsd4_encode_components(");
2156
2157 path_get(&cur);
2158 /* First walk the path up to the nfsd root, and store the
2159 * dentries/path components in an array.
2160 */
2161 for (;;) {
2162 if (path_equal(&cur, root))
2163 break;
2164 if (cur.dentry == cur.mnt->mnt_root) {
2165 if (follow_up(&cur))
2166 continue;
2167 goto out_free;
2168 }
2169 if ((ncomponents & 15) == 0) {
2170 struct dentry **new;
2171 new = krealloc(components,
2172 sizeof(*new) * (ncomponents + 16),
2173 GFP_KERNEL);
2174 if (!new)
2175 goto out_free;
2176 components = new;
2177 }
2178 components[ncomponents++] = cur.dentry;
2179 cur.dentry = dget_parent(cur.dentry);
2180 }
2181 err = nfserr_resource;
2182 p = xdr_reserve_space(xdr, 4);
2183 if (!p)
2184 goto out_free;
2185 *p++ = cpu_to_be32(ncomponents);
2186
2187 while (ncomponents) {
2188 struct dentry *dentry = components[ncomponents - 1];
2189 unsigned int len;
2190
2191 spin_lock(&dentry->d_lock);
2192 len = dentry->d_name.len;
2193 p = xdr_reserve_space(xdr, len + 4);
2194 if (!p) {
2195 spin_unlock(&dentry->d_lock);
2196 goto out_free;
2197 }
2198 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2199 dprintk("/%pd", dentry);
2200 spin_unlock(&dentry->d_lock);
2201 dput(dentry);
2202 ncomponents--;
2203 }
2204
2205 err = 0;
2206 out_free:
2207 dprintk(")\n");
2208 while (ncomponents)
2209 dput(components[--ncomponents]);
2210 kfree(components);
2211 path_put(&cur);
2212 return err;
2213 }
2214
2215 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2216 struct svc_rqst *rqstp, const struct path *path)
2217 {
2218 struct svc_export *exp_ps;
2219 __be32 res;
2220
2221 exp_ps = rqst_find_fsidzero_export(rqstp);
2222 if (IS_ERR(exp_ps))
2223 return nfserrno(PTR_ERR(exp_ps));
2224 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2225 exp_put(exp_ps);
2226 return res;
2227 }
2228
2229 /*
2230 * encode a fs_locations structure
2231 */
2232 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2233 struct svc_rqst *rqstp, struct svc_export *exp)
2234 {
2235 __be32 status;
2236 int i;
2237 __be32 *p;
2238 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2239
2240 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2241 if (status)
2242 return status;
2243 p = xdr_reserve_space(xdr, 4);
2244 if (!p)
2245 return nfserr_resource;
2246 *p++ = cpu_to_be32(fslocs->locations_count);
2247 for (i=0; i<fslocs->locations_count; i++) {
2248 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2249 if (status)
2250 return status;
2251 }
2252 return 0;
2253 }
2254
2255 static u32 nfs4_file_type(umode_t mode)
2256 {
2257 switch (mode & S_IFMT) {
2258 case S_IFIFO: return NF4FIFO;
2259 case S_IFCHR: return NF4CHR;
2260 case S_IFDIR: return NF4DIR;
2261 case S_IFBLK: return NF4BLK;
2262 case S_IFLNK: return NF4LNK;
2263 case S_IFREG: return NF4REG;
2264 case S_IFSOCK: return NF4SOCK;
2265 default: return NF4BAD;
2266 };
2267 }
2268
2269 static inline __be32
2270 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2271 struct nfs4_ace *ace)
2272 {
2273 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2274 return nfs4_acl_write_who(xdr, ace->whotype);
2275 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2276 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2277 else
2278 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2279 }
2280
2281 static inline __be32
2282 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2283 {
2284 __be32 *p;
2285 unsigned long i = hweight_long(layout_types);
2286
2287 p = xdr_reserve_space(xdr, 4 + 4 * i);
2288 if (!p)
2289 return nfserr_resource;
2290
2291 *p++ = cpu_to_be32(i);
2292
2293 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2294 if (layout_types & (1 << i))
2295 *p++ = cpu_to_be32(i);
2296
2297 return 0;
2298 }
2299
2300 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2301 FATTR4_WORD0_RDATTR_ERROR)
2302 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2303 #define WORD2_ABSENT_FS_ATTRS 0
2304
2305 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2306 static inline __be32
2307 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2308 void *context, int len)
2309 {
2310 __be32 *p;
2311
2312 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2313 if (!p)
2314 return nfserr_resource;
2315
2316 /*
2317 * For now we use a 0 here to indicate the null translation; in
2318 * the future we may place a call to translation code here.
2319 */
2320 *p++ = cpu_to_be32(0); /* lfs */
2321 *p++ = cpu_to_be32(0); /* pi */
2322 p = xdr_encode_opaque(p, context, len);
2323 return 0;
2324 }
2325 #else
2326 static inline __be32
2327 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2328 void *context, int len)
2329 { return 0; }
2330 #endif
2331
2332 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2333 {
2334 /* As per referral draft: */
2335 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2336 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2337 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2338 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2339 *rdattr_err = NFSERR_MOVED;
2340 else
2341 return nfserr_moved;
2342 }
2343 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2344 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2345 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2346 return 0;
2347 }
2348
2349
2350 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2351 {
2352 struct path path = exp->ex_path;
2353 int err;
2354
2355 path_get(&path);
2356 while (follow_up(&path)) {
2357 if (path.dentry != path.mnt->mnt_root)
2358 break;
2359 }
2360 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2361 path_put(&path);
2362 return err;
2363 }
2364
2365 static __be32
2366 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2367 {
2368 __be32 *p;
2369
2370 if (bmval2) {
2371 p = xdr_reserve_space(xdr, 16);
2372 if (!p)
2373 goto out_resource;
2374 *p++ = cpu_to_be32(3);
2375 *p++ = cpu_to_be32(bmval0);
2376 *p++ = cpu_to_be32(bmval1);
2377 *p++ = cpu_to_be32(bmval2);
2378 } else if (bmval1) {
2379 p = xdr_reserve_space(xdr, 12);
2380 if (!p)
2381 goto out_resource;
2382 *p++ = cpu_to_be32(2);
2383 *p++ = cpu_to_be32(bmval0);
2384 *p++ = cpu_to_be32(bmval1);
2385 } else {
2386 p = xdr_reserve_space(xdr, 8);
2387 if (!p)
2388 goto out_resource;
2389 *p++ = cpu_to_be32(1);
2390 *p++ = cpu_to_be32(bmval0);
2391 }
2392
2393 return 0;
2394 out_resource:
2395 return nfserr_resource;
2396 }
2397
2398 /*
2399 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2400 * ourselves.
2401 */
2402 static __be32
2403 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2404 struct svc_export *exp,
2405 struct dentry *dentry, u32 *bmval,
2406 struct svc_rqst *rqstp, int ignore_crossmnt)
2407 {
2408 u32 bmval0 = bmval[0];
2409 u32 bmval1 = bmval[1];
2410 u32 bmval2 = bmval[2];
2411 struct kstat stat;
2412 struct svc_fh *tempfh = NULL;
2413 struct kstatfs statfs;
2414 __be32 *p;
2415 int starting_len = xdr->buf->len;
2416 int attrlen_offset;
2417 __be32 attrlen;
2418 u32 dummy;
2419 u64 dummy64;
2420 u32 rdattr_err = 0;
2421 __be32 status;
2422 int err;
2423 struct nfs4_acl *acl = NULL;
2424 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2425 void *context = NULL;
2426 int contextlen;
2427 #endif
2428 bool contextsupport = false;
2429 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2430 u32 minorversion = resp->cstate.minorversion;
2431 struct path path = {
2432 .mnt = exp->ex_path.mnt,
2433 .dentry = dentry,
2434 };
2435 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2436
2437 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2438 BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2439
2440 if (exp->ex_fslocs.migrated) {
2441 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2442 if (status)
2443 goto out;
2444 }
2445
2446 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2447 if (err)
2448 goto out_nfserr;
2449 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2450 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2451 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2452 FATTR4_WORD1_SPACE_TOTAL))) {
2453 err = vfs_statfs(&path, &statfs);
2454 if (err)
2455 goto out_nfserr;
2456 }
2457 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2458 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2459 status = nfserr_jukebox;
2460 if (!tempfh)
2461 goto out;
2462 fh_init(tempfh, NFS4_FHSIZE);
2463 status = fh_compose(tempfh, exp, dentry, NULL);
2464 if (status)
2465 goto out;
2466 fhp = tempfh;
2467 }
2468 if (bmval0 & FATTR4_WORD0_ACL) {
2469 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2470 if (err == -EOPNOTSUPP)
2471 bmval0 &= ~FATTR4_WORD0_ACL;
2472 else if (err == -EINVAL) {
2473 status = nfserr_attrnotsupp;
2474 goto out;
2475 } else if (err != 0)
2476 goto out_nfserr;
2477 }
2478
2479 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2480 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2481 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2482 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2483 err = security_inode_getsecctx(d_inode(dentry),
2484 &context, &contextlen);
2485 else
2486 err = -EOPNOTSUPP;
2487 contextsupport = (err == 0);
2488 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2489 if (err == -EOPNOTSUPP)
2490 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2491 else if (err)
2492 goto out_nfserr;
2493 }
2494 }
2495 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2496
2497 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2498 if (status)
2499 goto out;
2500
2501 attrlen_offset = xdr->buf->len;
2502 p = xdr_reserve_space(xdr, 4);
2503 if (!p)
2504 goto out_resource;
2505 p++; /* to be backfilled later */
2506
2507 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2508 u32 supp[3];
2509
2510 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2511
2512 if (!IS_POSIXACL(dentry->d_inode))
2513 supp[0] &= ~FATTR4_WORD0_ACL;
2514 if (!contextsupport)
2515 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2516 if (!supp[2]) {
2517 p = xdr_reserve_space(xdr, 12);
2518 if (!p)
2519 goto out_resource;
2520 *p++ = cpu_to_be32(2);
2521 *p++ = cpu_to_be32(supp[0]);
2522 *p++ = cpu_to_be32(supp[1]);
2523 } else {
2524 p = xdr_reserve_space(xdr, 16);
2525 if (!p)
2526 goto out_resource;
2527 *p++ = cpu_to_be32(3);
2528 *p++ = cpu_to_be32(supp[0]);
2529 *p++ = cpu_to_be32(supp[1]);
2530 *p++ = cpu_to_be32(supp[2]);
2531 }
2532 }
2533 if (bmval0 & FATTR4_WORD0_TYPE) {
2534 p = xdr_reserve_space(xdr, 4);
2535 if (!p)
2536 goto out_resource;
2537 dummy = nfs4_file_type(stat.mode);
2538 if (dummy == NF4BAD) {
2539 status = nfserr_serverfault;
2540 goto out;
2541 }
2542 *p++ = cpu_to_be32(dummy);
2543 }
2544 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2545 p = xdr_reserve_space(xdr, 4);
2546 if (!p)
2547 goto out_resource;
2548 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2549 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2550 else
2551 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2552 NFS4_FH_VOL_RENAME);
2553 }
2554 if (bmval0 & FATTR4_WORD0_CHANGE) {
2555 p = xdr_reserve_space(xdr, 8);
2556 if (!p)
2557 goto out_resource;
2558 p = encode_change(p, &stat, d_inode(dentry), exp);
2559 }
2560 if (bmval0 & FATTR4_WORD0_SIZE) {
2561 p = xdr_reserve_space(xdr, 8);
2562 if (!p)
2563 goto out_resource;
2564 p = xdr_encode_hyper(p, stat.size);
2565 }
2566 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2567 p = xdr_reserve_space(xdr, 4);
2568 if (!p)
2569 goto out_resource;
2570 *p++ = cpu_to_be32(1);
2571 }
2572 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2573 p = xdr_reserve_space(xdr, 4);
2574 if (!p)
2575 goto out_resource;
2576 *p++ = cpu_to_be32(1);
2577 }
2578 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2579 p = xdr_reserve_space(xdr, 4);
2580 if (!p)
2581 goto out_resource;
2582 *p++ = cpu_to_be32(0);
2583 }
2584 if (bmval0 & FATTR4_WORD0_FSID) {
2585 p = xdr_reserve_space(xdr, 16);
2586 if (!p)
2587 goto out_resource;
2588 if (exp->ex_fslocs.migrated) {
2589 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2590 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2591 } else switch(fsid_source(fhp)) {
2592 case FSIDSOURCE_FSID:
2593 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2594 p = xdr_encode_hyper(p, (u64)0);
2595 break;
2596 case FSIDSOURCE_DEV:
2597 *p++ = cpu_to_be32(0);
2598 *p++ = cpu_to_be32(MAJOR(stat.dev));
2599 *p++ = cpu_to_be32(0);
2600 *p++ = cpu_to_be32(MINOR(stat.dev));
2601 break;
2602 case FSIDSOURCE_UUID:
2603 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2604 EX_UUID_LEN);
2605 break;
2606 }
2607 }
2608 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2609 p = xdr_reserve_space(xdr, 4);
2610 if (!p)
2611 goto out_resource;
2612 *p++ = cpu_to_be32(0);
2613 }
2614 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2615 p = xdr_reserve_space(xdr, 4);
2616 if (!p)
2617 goto out_resource;
2618 *p++ = cpu_to_be32(nn->nfsd4_lease);
2619 }
2620 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2621 p = xdr_reserve_space(xdr, 4);
2622 if (!p)
2623 goto out_resource;
2624 *p++ = cpu_to_be32(rdattr_err);
2625 }
2626 if (bmval0 & FATTR4_WORD0_ACL) {
2627 struct nfs4_ace *ace;
2628
2629 if (acl == NULL) {
2630 p = xdr_reserve_space(xdr, 4);
2631 if (!p)
2632 goto out_resource;
2633
2634 *p++ = cpu_to_be32(0);
2635 goto out_acl;
2636 }
2637 p = xdr_reserve_space(xdr, 4);
2638 if (!p)
2639 goto out_resource;
2640 *p++ = cpu_to_be32(acl->naces);
2641
2642 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2643 p = xdr_reserve_space(xdr, 4*3);
2644 if (!p)
2645 goto out_resource;
2646 *p++ = cpu_to_be32(ace->type);
2647 *p++ = cpu_to_be32(ace->flag);
2648 *p++ = cpu_to_be32(ace->access_mask &
2649 NFS4_ACE_MASK_ALL);
2650 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2651 if (status)
2652 goto out;
2653 }
2654 }
2655 out_acl:
2656 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2657 p = xdr_reserve_space(xdr, 4);
2658 if (!p)
2659 goto out_resource;
2660 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2661 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2662 }
2663 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2664 p = xdr_reserve_space(xdr, 4);
2665 if (!p)
2666 goto out_resource;
2667 *p++ = cpu_to_be32(1);
2668 }
2669 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2670 p = xdr_reserve_space(xdr, 4);
2671 if (!p)
2672 goto out_resource;
2673 *p++ = cpu_to_be32(0);
2674 }
2675 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2676 p = xdr_reserve_space(xdr, 4);
2677 if (!p)
2678 goto out_resource;
2679 *p++ = cpu_to_be32(1);
2680 }
2681 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2682 p = xdr_reserve_space(xdr, 4);
2683 if (!p)
2684 goto out_resource;
2685 *p++ = cpu_to_be32(1);
2686 }
2687 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2688 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2689 if (!p)
2690 goto out_resource;
2691 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2692 fhp->fh_handle.fh_size);
2693 }
2694 if (bmval0 & FATTR4_WORD0_FILEID) {
2695 p = xdr_reserve_space(xdr, 8);
2696 if (!p)
2697 goto out_resource;
2698 p = xdr_encode_hyper(p, stat.ino);
2699 }
2700 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2701 p = xdr_reserve_space(xdr, 8);
2702 if (!p)
2703 goto out_resource;
2704 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2705 }
2706 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2707 p = xdr_reserve_space(xdr, 8);
2708 if (!p)
2709 goto out_resource;
2710 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2711 }
2712 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2713 p = xdr_reserve_space(xdr, 8);
2714 if (!p)
2715 goto out_resource;
2716 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2717 }
2718 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2719 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2720 if (status)
2721 goto out;
2722 }
2723 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2724 p = xdr_reserve_space(xdr, 4);
2725 if (!p)
2726 goto out_resource;
2727 *p++ = cpu_to_be32(1);
2728 }
2729 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2730 p = xdr_reserve_space(xdr, 8);
2731 if (!p)
2732 goto out_resource;
2733 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2734 }
2735 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2736 p = xdr_reserve_space(xdr, 4);
2737 if (!p)
2738 goto out_resource;
2739 *p++ = cpu_to_be32(255);
2740 }
2741 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2742 p = xdr_reserve_space(xdr, 4);
2743 if (!p)
2744 goto out_resource;
2745 *p++ = cpu_to_be32(statfs.f_namelen);
2746 }
2747 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2748 p = xdr_reserve_space(xdr, 8);
2749 if (!p)
2750 goto out_resource;
2751 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2752 }
2753 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2754 p = xdr_reserve_space(xdr, 8);
2755 if (!p)
2756 goto out_resource;
2757 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2758 }
2759 if (bmval1 & FATTR4_WORD1_MODE) {
2760 p = xdr_reserve_space(xdr, 4);
2761 if (!p)
2762 goto out_resource;
2763 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2764 }
2765 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2766 p = xdr_reserve_space(xdr, 4);
2767 if (!p)
2768 goto out_resource;
2769 *p++ = cpu_to_be32(1);
2770 }
2771 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2772 p = xdr_reserve_space(xdr, 4);
2773 if (!p)
2774 goto out_resource;
2775 *p++ = cpu_to_be32(stat.nlink);
2776 }
2777 if (bmval1 & FATTR4_WORD1_OWNER) {
2778 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2779 if (status)
2780 goto out;
2781 }
2782 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2783 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2784 if (status)
2785 goto out;
2786 }
2787 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2788 p = xdr_reserve_space(xdr, 8);
2789 if (!p)
2790 goto out_resource;
2791 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2792 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2793 }
2794 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2795 p = xdr_reserve_space(xdr, 8);
2796 if (!p)
2797 goto out_resource;
2798 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2799 p = xdr_encode_hyper(p, dummy64);
2800 }
2801 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2802 p = xdr_reserve_space(xdr, 8);
2803 if (!p)
2804 goto out_resource;
2805 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2806 p = xdr_encode_hyper(p, dummy64);
2807 }
2808 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2809 p = xdr_reserve_space(xdr, 8);
2810 if (!p)
2811 goto out_resource;
2812 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2813 p = xdr_encode_hyper(p, dummy64);
2814 }
2815 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2816 p = xdr_reserve_space(xdr, 8);
2817 if (!p)
2818 goto out_resource;
2819 dummy64 = (u64)stat.blocks << 9;
2820 p = xdr_encode_hyper(p, dummy64);
2821 }
2822 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2823 p = xdr_reserve_space(xdr, 12);
2824 if (!p)
2825 goto out_resource;
2826 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2827 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2828 }
2829 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2830 p = xdr_reserve_space(xdr, 12);
2831 if (!p)
2832 goto out_resource;
2833 p = encode_time_delta(p, d_inode(dentry));
2834 }
2835 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2836 p = xdr_reserve_space(xdr, 12);
2837 if (!p)
2838 goto out_resource;
2839 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2840 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2841 }
2842 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2843 p = xdr_reserve_space(xdr, 12);
2844 if (!p)
2845 goto out_resource;
2846 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2847 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2848 }
2849 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2850 struct kstat parent_stat;
2851 u64 ino = stat.ino;
2852
2853 p = xdr_reserve_space(xdr, 8);
2854 if (!p)
2855 goto out_resource;
2856 /*
2857 * Get parent's attributes if not ignoring crossmount
2858 * and this is the root of a cross-mounted filesystem.
2859 */
2860 if (ignore_crossmnt == 0 &&
2861 dentry == exp->ex_path.mnt->mnt_root) {
2862 err = get_parent_attributes(exp, &parent_stat);
2863 if (err)
2864 goto out_nfserr;
2865 ino = parent_stat.ino;
2866 }
2867 p = xdr_encode_hyper(p, ino);
2868 }
2869 #ifdef CONFIG_NFSD_PNFS
2870 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2871 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2872 if (status)
2873 goto out;
2874 }
2875
2876 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2877 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2878 if (status)
2879 goto out;
2880 }
2881
2882 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2883 p = xdr_reserve_space(xdr, 4);
2884 if (!p)
2885 goto out_resource;
2886 *p++ = cpu_to_be32(stat.blksize);
2887 }
2888 #endif /* CONFIG_NFSD_PNFS */
2889 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2890 u32 supp[3];
2891
2892 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2893 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2894 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2895 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2896
2897 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2898 if (status)
2899 goto out;
2900 }
2901
2902 if (bmval2 & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
2903 p = xdr_reserve_space(xdr, 4);
2904 if (!p)
2905 goto out_resource;
2906 if (IS_I_VERSION(d_inode(dentry)))
2907 *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR);
2908 else
2909 *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_TIME_METADATA);
2910 }
2911
2912 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2913 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2914 status = nfsd4_encode_security_label(xdr, rqstp, context,
2915 contextlen);
2916 if (status)
2917 goto out;
2918 }
2919 #endif
2920
2921 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2922 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2923 status = nfs_ok;
2924
2925 out:
2926 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2927 if (context)
2928 security_release_secctx(context, contextlen);
2929 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2930 kfree(acl);
2931 if (tempfh) {
2932 fh_put(tempfh);
2933 kfree(tempfh);
2934 }
2935 if (status)
2936 xdr_truncate_encode(xdr, starting_len);
2937 return status;
2938 out_nfserr:
2939 status = nfserrno(err);
2940 goto out;
2941 out_resource:
2942 status = nfserr_resource;
2943 goto out;
2944 }
2945
2946 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2947 struct xdr_buf *buf, __be32 *p, int bytes)
2948 {
2949 xdr->scratch.iov_len = 0;
2950 memset(buf, 0, sizeof(struct xdr_buf));
2951 buf->head[0].iov_base = p;
2952 buf->head[0].iov_len = 0;
2953 buf->len = 0;
2954 xdr->buf = buf;
2955 xdr->iov = buf->head;
2956 xdr->p = p;
2957 xdr->end = (void *)p + bytes;
2958 buf->buflen = bytes;
2959 }
2960
2961 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2962 struct svc_fh *fhp, struct svc_export *exp,
2963 struct dentry *dentry, u32 *bmval,
2964 struct svc_rqst *rqstp, int ignore_crossmnt)
2965 {
2966 struct xdr_buf dummy;
2967 struct xdr_stream xdr;
2968 __be32 ret;
2969
2970 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2971 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2972 ignore_crossmnt);
2973 *p = xdr.p;
2974 return ret;
2975 }
2976
2977 static inline int attributes_need_mount(u32 *bmval)
2978 {
2979 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2980 return 1;
2981 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2982 return 1;
2983 return 0;
2984 }
2985
2986 static __be32
2987 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2988 const char *name, int namlen)
2989 {
2990 struct svc_export *exp = cd->rd_fhp->fh_export;
2991 struct dentry *dentry;
2992 __be32 nfserr;
2993 int ignore_crossmnt = 0;
2994
2995 dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2996 if (IS_ERR(dentry))
2997 return nfserrno(PTR_ERR(dentry));
2998 if (d_really_is_negative(dentry)) {
2999 /*
3000 * we're not holding the i_mutex here, so there's
3001 * a window where this directory entry could have gone
3002 * away.
3003 */
3004 dput(dentry);
3005 return nfserr_noent;
3006 }
3007
3008 exp_get(exp);
3009 /*
3010 * In the case of a mountpoint, the client may be asking for
3011 * attributes that are only properties of the underlying filesystem
3012 * as opposed to the cross-mounted file system. In such a case,
3013 * we will not follow the cross mount and will fill the attribtutes
3014 * directly from the mountpoint dentry.
3015 */
3016 if (nfsd_mountpoint(dentry, exp)) {
3017 int err;
3018
3019 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3020 && !attributes_need_mount(cd->rd_bmval)) {
3021 ignore_crossmnt = 1;
3022 goto out_encode;
3023 }
3024 /*
3025 * Why the heck aren't we just using nfsd_lookup??
3026 * Different "."/".." handling? Something else?
3027 * At least, add a comment here to explain....
3028 */
3029 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3030 if (err) {
3031 nfserr = nfserrno(err);
3032 goto out_put;
3033 }
3034 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3035 if (nfserr)
3036 goto out_put;
3037
3038 }
3039 out_encode:
3040 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3041 cd->rd_rqstp, ignore_crossmnt);
3042 out_put:
3043 dput(dentry);
3044 exp_put(exp);
3045 return nfserr;
3046 }
3047
3048 static __be32 *
3049 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3050 {
3051 __be32 *p;
3052
3053 p = xdr_reserve_space(xdr, 20);
3054 if (!p)
3055 return NULL;
3056 *p++ = htonl(2);
3057 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3058 *p++ = htonl(0); /* bmval1 */
3059
3060 *p++ = htonl(4); /* attribute length */
3061 *p++ = nfserr; /* no htonl */
3062 return p;
3063 }
3064
3065 static int
3066 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3067 loff_t offset, u64 ino, unsigned int d_type)
3068 {
3069 struct readdir_cd *ccd = ccdv;
3070 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3071 struct xdr_stream *xdr = cd->xdr;
3072 int start_offset = xdr->buf->len;
3073 int cookie_offset;
3074 u32 name_and_cookie;
3075 int entry_bytes;
3076 __be32 nfserr = nfserr_toosmall;
3077 __be64 wire_offset;
3078 __be32 *p;
3079
3080 /* In nfsv4, "." and ".." never make it onto the wire.. */
3081 if (name && isdotent(name, namlen)) {
3082 cd->common.err = nfs_ok;
3083 return 0;
3084 }
3085
3086 if (cd->cookie_offset) {
3087 wire_offset = cpu_to_be64(offset);
3088 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3089 &wire_offset, 8);
3090 }
3091
3092 p = xdr_reserve_space(xdr, 4);
3093 if (!p)
3094 goto fail;
3095 *p++ = xdr_one; /* mark entry present */
3096 cookie_offset = xdr->buf->len;
3097 p = xdr_reserve_space(xdr, 3*4 + namlen);
3098 if (!p)
3099 goto fail;
3100 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
3101 p = xdr_encode_array(p, name, namlen); /* name length & name */
3102
3103 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3104 switch (nfserr) {
3105 case nfs_ok:
3106 break;
3107 case nfserr_resource:
3108 nfserr = nfserr_toosmall;
3109 goto fail;
3110 case nfserr_noent:
3111 xdr_truncate_encode(xdr, start_offset);
3112 goto skip_entry;
3113 default:
3114 /*
3115 * If the client requested the RDATTR_ERROR attribute,
3116 * we stuff the error code into this attribute
3117 * and continue. If this attribute was not requested,
3118 * then in accordance with the spec, we fail the
3119 * entire READDIR operation(!)
3120 */
3121 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3122 goto fail;
3123 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3124 if (p == NULL) {
3125 nfserr = nfserr_toosmall;
3126 goto fail;
3127 }
3128 }
3129 nfserr = nfserr_toosmall;
3130 entry_bytes = xdr->buf->len - start_offset;
3131 if (entry_bytes > cd->rd_maxcount)
3132 goto fail;
3133 cd->rd_maxcount -= entry_bytes;
3134 /*
3135 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3136 * let's always let through the first entry, at least:
3137 */
3138 if (!cd->rd_dircount)
3139 goto fail;
3140 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3141 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3142 goto fail;
3143 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3144
3145 cd->cookie_offset = cookie_offset;
3146 skip_entry:
3147 cd->common.err = nfs_ok;
3148 return 0;
3149 fail:
3150 xdr_truncate_encode(xdr, start_offset);
3151 cd->common.err = nfserr;
3152 return -EINVAL;
3153 }
3154
3155 static __be32
3156 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3157 {
3158 __be32 *p;
3159
3160 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3161 if (!p)
3162 return nfserr_resource;
3163 *p++ = cpu_to_be32(sid->si_generation);
3164 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3165 sizeof(stateid_opaque_t));
3166 return 0;
3167 }
3168
3169 static __be32
3170 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3171 {
3172 struct xdr_stream *xdr = &resp->xdr;
3173 __be32 *p;
3174
3175 p = xdr_reserve_space(xdr, 8);
3176 if (!p)
3177 return nfserr_resource;
3178 *p++ = cpu_to_be32(access->ac_supported);
3179 *p++ = cpu_to_be32(access->ac_resp_access);
3180 return 0;
3181 }
3182
3183 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3184 {
3185 struct xdr_stream *xdr = &resp->xdr;
3186 __be32 *p;
3187
3188 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3189 if (!p)
3190 return nfserr_resource;
3191 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3192 NFS4_MAX_SESSIONID_LEN);
3193 *p++ = cpu_to_be32(bcts->dir);
3194 /* Upshifting from TCP to RDMA is not supported */
3195 *p++ = cpu_to_be32(0);
3196 return 0;
3197 }
3198
3199 static __be32
3200 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3201 {
3202 struct xdr_stream *xdr = &resp->xdr;
3203
3204 return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3205 }
3206
3207
3208 static __be32
3209 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3210 {
3211 struct xdr_stream *xdr = &resp->xdr;
3212 __be32 *p;
3213
3214 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3215 if (!p)
3216 return nfserr_resource;
3217 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3218 NFS4_VERIFIER_SIZE);
3219 return 0;
3220 }
3221
3222 static __be32
3223 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3224 {
3225 struct xdr_stream *xdr = &resp->xdr;
3226 __be32 *p;
3227
3228 p = xdr_reserve_space(xdr, 20);
3229 if (!p)
3230 return nfserr_resource;
3231 encode_cinfo(p, &create->cr_cinfo);
3232 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3233 create->cr_bmval[1], create->cr_bmval[2]);
3234 return 0;
3235 }
3236
3237 static __be32
3238 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3239 {
3240 struct svc_fh *fhp = getattr->ga_fhp;
3241 struct xdr_stream *xdr = &resp->xdr;
3242
3243 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3244 getattr->ga_bmval, resp->rqstp, 0);
3245 }
3246
3247 static __be32
3248 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3249 {
3250 struct xdr_stream *xdr = &resp->xdr;
3251 struct svc_fh *fhp = *fhpp;
3252 unsigned int len;
3253 __be32 *p;
3254
3255 len = fhp->fh_handle.fh_size;
3256 p = xdr_reserve_space(xdr, len + 4);
3257 if (!p)
3258 return nfserr_resource;
3259 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3260 return 0;
3261 }
3262
3263 /*
3264 * Including all fields other than the name, a LOCK4denied structure requires
3265 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3266 */
3267 static __be32
3268 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3269 {
3270 struct xdr_netobj *conf = &ld->ld_owner;
3271 __be32 *p;
3272
3273 again:
3274 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3275 if (!p) {
3276 /*
3277 * Don't fail to return the result just because we can't
3278 * return the conflicting open:
3279 */
3280 if (conf->len) {
3281 kfree(conf->data);
3282 conf->len = 0;
3283 conf->data = NULL;
3284 goto again;
3285 }
3286 return nfserr_resource;
3287 }
3288 p = xdr_encode_hyper(p, ld->ld_start);
3289 p = xdr_encode_hyper(p, ld->ld_length);
3290 *p++ = cpu_to_be32(ld->ld_type);
3291 if (conf->len) {
3292 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3293 p = xdr_encode_opaque(p, conf->data, conf->len);
3294 kfree(conf->data);
3295 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
3296 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3297 *p++ = cpu_to_be32(0); /* length of owner name */
3298 }
3299 return nfserr_denied;
3300 }
3301
3302 static __be32
3303 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3304 {
3305 struct xdr_stream *xdr = &resp->xdr;
3306
3307 if (!nfserr)
3308 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3309 else if (nfserr == nfserr_denied)
3310 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3311
3312 return nfserr;
3313 }
3314
3315 static __be32
3316 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3317 {
3318 struct xdr_stream *xdr = &resp->xdr;
3319
3320 if (nfserr == nfserr_denied)
3321 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3322 return nfserr;
3323 }
3324
3325 static __be32
3326 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3327 {
3328 struct xdr_stream *xdr = &resp->xdr;
3329
3330 return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3331 }
3332
3333
3334 static __be32
3335 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3336 {
3337 struct xdr_stream *xdr = &resp->xdr;
3338 __be32 *p;
3339
3340 p = xdr_reserve_space(xdr, 20);
3341 if (!p)
3342 return nfserr_resource;
3343 p = encode_cinfo(p, &link->li_cinfo);
3344 return 0;
3345 }
3346
3347
3348 static __be32
3349 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3350 {
3351 struct xdr_stream *xdr = &resp->xdr;
3352 __be32 *p;
3353
3354 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3355 if (nfserr)
3356 return nfserr;
3357 p = xdr_reserve_space(xdr, 24);
3358 if (!p)
3359 return nfserr_resource;
3360 p = encode_cinfo(p, &open->op_cinfo);
3361 *p++ = cpu_to_be32(open->op_rflags);
3362
3363 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3364 open->op_bmval[2]);
3365 if (nfserr)
3366 return nfserr;
3367
3368 p = xdr_reserve_space(xdr, 4);
3369 if (!p)
3370 return nfserr_resource;
3371
3372 *p++ = cpu_to_be32(open->op_delegate_type);
3373 switch (open->op_delegate_type) {
3374 case NFS4_OPEN_DELEGATE_NONE:
3375 break;
3376 case NFS4_OPEN_DELEGATE_READ:
3377 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3378 if (nfserr)
3379 return nfserr;
3380 p = xdr_reserve_space(xdr, 20);
3381 if (!p)
3382 return nfserr_resource;
3383 *p++ = cpu_to_be32(open->op_recall);
3384
3385 /*
3386 * TODO: ACE's in delegations
3387 */
3388 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3389 *p++ = cpu_to_be32(0);
3390 *p++ = cpu_to_be32(0);
3391 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3392 break;
3393 case NFS4_OPEN_DELEGATE_WRITE:
3394 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3395 if (nfserr)
3396 return nfserr;
3397 p = xdr_reserve_space(xdr, 32);
3398 if (!p)
3399 return nfserr_resource;
3400 *p++ = cpu_to_be32(0);
3401
3402 /*
3403 * TODO: space_limit's in delegations
3404 */
3405 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3406 *p++ = cpu_to_be32(~(u32)0);
3407 *p++ = cpu_to_be32(~(u32)0);
3408
3409 /*
3410 * TODO: ACE's in delegations
3411 */
3412 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3413 *p++ = cpu_to_be32(0);
3414 *p++ = cpu_to_be32(0);
3415 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3416 break;
3417 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3418 switch (open->op_why_no_deleg) {
3419 case WND4_CONTENTION:
3420 case WND4_RESOURCE:
3421 p = xdr_reserve_space(xdr, 8);
3422 if (!p)
3423 return nfserr_resource;
3424 *p++ = cpu_to_be32(open->op_why_no_deleg);
3425 /* deleg signaling not supported yet: */
3426 *p++ = cpu_to_be32(0);
3427 break;
3428 default:
3429 p = xdr_reserve_space(xdr, 4);
3430 if (!p)
3431 return nfserr_resource;
3432 *p++ = cpu_to_be32(open->op_why_no_deleg);
3433 }
3434 break;
3435 default:
3436 BUG();
3437 }
3438 /* XXX save filehandle here */
3439 return 0;
3440 }
3441
3442 static __be32
3443 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3444 {
3445 struct xdr_stream *xdr = &resp->xdr;
3446
3447 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3448 }
3449
3450 static __be32
3451 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3452 {
3453 struct xdr_stream *xdr = &resp->xdr;
3454
3455 return nfsd4_encode_stateid(xdr, &od->od_stateid);
3456 }
3457
3458 static __be32 nfsd4_encode_splice_read(
3459 struct nfsd4_compoundres *resp,
3460 struct nfsd4_read *read,
3461 struct file *file, unsigned long maxcount)
3462 {
3463 struct xdr_stream *xdr = &resp->xdr;
3464 struct xdr_buf *buf = xdr->buf;
3465 u32 eof;
3466 long len;
3467 int space_left;
3468 __be32 nfserr;
3469 __be32 *p = xdr->p - 2;
3470
3471 /* Make sure there will be room for padding if needed */
3472 if (xdr->end - xdr->p < 1)
3473 return nfserr_resource;
3474
3475 len = maxcount;
3476 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3477 file, read->rd_offset, &maxcount);
3478 read->rd_length = maxcount;
3479 if (nfserr) {
3480 /*
3481 * nfsd_splice_actor may have already messed with the
3482 * page length; reset it so as not to confuse
3483 * xdr_truncate_encode:
3484 */
3485 buf->page_len = 0;
3486 return nfserr;
3487 }
3488
3489 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3490 d_inode(read->rd_fhp->fh_dentry)->i_size);
3491
3492 *(p++) = htonl(eof);
3493 *(p++) = htonl(maxcount);
3494
3495 buf->page_len = maxcount;
3496 buf->len += maxcount;
3497 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3498 / PAGE_SIZE;
3499
3500 /* Use rest of head for padding and remaining ops: */
3501 buf->tail[0].iov_base = xdr->p;
3502 buf->tail[0].iov_len = 0;
3503 xdr->iov = buf->tail;
3504 if (maxcount&3) {
3505 int pad = 4 - (maxcount&3);
3506
3507 *(xdr->p++) = 0;
3508
3509 buf->tail[0].iov_base += maxcount&3;
3510 buf->tail[0].iov_len = pad;
3511 buf->len += pad;
3512 }
3513
3514 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3515 buf->buflen - buf->len);
3516 buf->buflen = buf->len + space_left;
3517 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3518
3519 return 0;
3520 }
3521
3522 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3523 struct nfsd4_read *read,
3524 struct file *file, unsigned long maxcount)
3525 {
3526 struct xdr_stream *xdr = &resp->xdr;
3527 u32 eof;
3528 int v;
3529 int starting_len = xdr->buf->len - 8;
3530 long len;
3531 int thislen;
3532 __be32 nfserr;
3533 __be32 tmp;
3534 __be32 *p;
3535 u32 zzz = 0;
3536 int pad;
3537
3538 len = maxcount;
3539 v = 0;
3540
3541 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3542 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3543 WARN_ON_ONCE(!p);
3544 resp->rqstp->rq_vec[v].iov_base = p;
3545 resp->rqstp->rq_vec[v].iov_len = thislen;
3546 v++;
3547 len -= thislen;
3548
3549 while (len) {
3550 thislen = min_t(long, len, PAGE_SIZE);
3551 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3552 WARN_ON_ONCE(!p);
3553 resp->rqstp->rq_vec[v].iov_base = p;
3554 resp->rqstp->rq_vec[v].iov_len = thislen;
3555 v++;
3556 len -= thislen;
3557 }
3558 read->rd_vlen = v;
3559
3560 len = maxcount;
3561 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3562 resp->rqstp->rq_vec, read->rd_vlen, &maxcount);
3563 read->rd_length = maxcount;
3564 if (nfserr)
3565 return nfserr;
3566 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3567
3568 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3569 d_inode(read->rd_fhp->fh_dentry)->i_size);
3570
3571 tmp = htonl(eof);
3572 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3573 tmp = htonl(maxcount);
3574 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3575
3576 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3577 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3578 &zzz, pad);
3579 return 0;
3580
3581 }
3582
3583 static __be32
3584 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3585 struct nfsd4_read *read)
3586 {
3587 unsigned long maxcount;
3588 struct xdr_stream *xdr = &resp->xdr;
3589 struct file *file = read->rd_filp;
3590 int starting_len = xdr->buf->len;
3591 struct raparms *ra = NULL;
3592 __be32 *p;
3593
3594 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3595 if (!p) {
3596 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3597 return nfserr_resource;
3598 }
3599 if (resp->xdr.buf->page_len &&
3600 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3601 WARN_ON_ONCE(1);
3602 return nfserr_resource;
3603 }
3604 xdr_commit_encode(xdr);
3605
3606 maxcount = svc_max_payload(resp->rqstp);
3607 maxcount = min_t(unsigned long, maxcount,
3608 (xdr->buf->buflen - xdr->buf->len));
3609 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3610
3611 if (read->rd_tmp_file)
3612 ra = nfsd_init_raparms(file);
3613
3614 if (file->f_op->splice_read &&
3615 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3616 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3617 else
3618 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3619
3620 if (ra)
3621 nfsd_put_raparams(file, ra);
3622
3623 if (nfserr)
3624 xdr_truncate_encode(xdr, starting_len);
3625
3626 return nfserr;
3627 }
3628
3629 static __be32
3630 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3631 {
3632 int maxcount;
3633 __be32 wire_count;
3634 int zero = 0;
3635 struct xdr_stream *xdr = &resp->xdr;
3636 int length_offset = xdr->buf->len;
3637 __be32 *p;
3638
3639 p = xdr_reserve_space(xdr, 4);
3640 if (!p)
3641 return nfserr_resource;
3642 maxcount = PAGE_SIZE;
3643
3644 p = xdr_reserve_space(xdr, maxcount);
3645 if (!p)
3646 return nfserr_resource;
3647 /*
3648 * XXX: By default, vfs_readlink() will truncate symlinks if they
3649 * would overflow the buffer. Is this kosher in NFSv4? If not, one
3650 * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3651 * that truncation occurred, and return NFS4ERR_RESOURCE.
3652 */
3653 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3654 (char *)p, &maxcount);
3655 if (nfserr == nfserr_isdir)
3656 nfserr = nfserr_inval;
3657 if (nfserr) {
3658 xdr_truncate_encode(xdr, length_offset);
3659 return nfserr;
3660 }
3661
3662 wire_count = htonl(maxcount);
3663 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3664 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3665 if (maxcount & 3)
3666 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3667 &zero, 4 - (maxcount&3));
3668 return 0;
3669 }
3670
3671 static __be32
3672 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3673 {
3674 int maxcount;
3675 int bytes_left;
3676 loff_t offset;
3677 __be64 wire_offset;
3678 struct xdr_stream *xdr = &resp->xdr;
3679 int starting_len = xdr->buf->len;
3680 __be32 *p;
3681
3682 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3683 if (!p)
3684 return nfserr_resource;
3685
3686 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3687 *p++ = cpu_to_be32(0);
3688 *p++ = cpu_to_be32(0);
3689 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3690 - (char *)resp->xdr.buf->head[0].iov_base;
3691
3692 /*
3693 * Number of bytes left for directory entries allowing for the
3694 * final 8 bytes of the readdir and a following failed op:
3695 */
3696 bytes_left = xdr->buf->buflen - xdr->buf->len
3697 - COMPOUND_ERR_SLACK_SPACE - 8;
3698 if (bytes_left < 0) {
3699 nfserr = nfserr_resource;
3700 goto err_no_verf;
3701 }
3702 maxcount = svc_max_payload(resp->rqstp);
3703 maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3704 /*
3705 * Note the rfc defines rd_maxcount as the size of the
3706 * READDIR4resok structure, which includes the verifier above
3707 * and the 8 bytes encoded at the end of this function:
3708 */
3709 if (maxcount < 16) {
3710 nfserr = nfserr_toosmall;
3711 goto err_no_verf;
3712 }
3713 maxcount = min_t(int, maxcount-16, bytes_left);
3714
3715 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3716 if (!readdir->rd_dircount)
3717 readdir->rd_dircount = svc_max_payload(resp->rqstp);
3718
3719 readdir->xdr = xdr;
3720 readdir->rd_maxcount = maxcount;
3721 readdir->common.err = 0;
3722 readdir->cookie_offset = 0;
3723
3724 offset = readdir->rd_cookie;
3725 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3726 &offset,
3727 &readdir->common, nfsd4_encode_dirent);
3728 if (nfserr == nfs_ok &&
3729 readdir->common.err == nfserr_toosmall &&
3730 xdr->buf->len == starting_len + 8) {
3731 /* nothing encoded; which limit did we hit?: */
3732 if (maxcount - 16 < bytes_left)
3733 /* It was the fault of rd_maxcount: */
3734 nfserr = nfserr_toosmall;
3735 else
3736 /* We ran out of buffer space: */
3737 nfserr = nfserr_resource;
3738 }
3739 if (nfserr)
3740 goto err_no_verf;
3741
3742 if (readdir->cookie_offset) {
3743 wire_offset = cpu_to_be64(offset);
3744 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3745 &wire_offset, 8);
3746 }
3747
3748 p = xdr_reserve_space(xdr, 8);
3749 if (!p) {
3750 WARN_ON_ONCE(1);
3751 goto err_no_verf;
3752 }
3753 *p++ = 0; /* no more entries */
3754 *p++ = htonl(readdir->common.err == nfserr_eof);
3755
3756 return 0;
3757 err_no_verf:
3758 xdr_truncate_encode(xdr, starting_len);
3759 return nfserr;
3760 }
3761
3762 static __be32
3763 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3764 {
3765 struct xdr_stream *xdr = &resp->xdr;
3766 __be32 *p;
3767
3768 p = xdr_reserve_space(xdr, 20);
3769 if (!p)
3770 return nfserr_resource;
3771 p = encode_cinfo(p, &remove->rm_cinfo);
3772 return 0;
3773 }
3774
3775 static __be32
3776 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3777 {
3778 struct xdr_stream *xdr = &resp->xdr;
3779 __be32 *p;
3780
3781 p = xdr_reserve_space(xdr, 40);
3782 if (!p)
3783 return nfserr_resource;
3784 p = encode_cinfo(p, &rename->rn_sinfo);
3785 p = encode_cinfo(p, &rename->rn_tinfo);
3786 return 0;
3787 }
3788
3789 static __be32
3790 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
3791 {
3792 u32 i, nflavs, supported;
3793 struct exp_flavor_info *flavs;
3794 struct exp_flavor_info def_flavs[2];
3795 __be32 *p, *flavorsp;
3796 static bool report = true;
3797
3798 if (exp->ex_nflavors) {
3799 flavs = exp->ex_flavors;
3800 nflavs = exp->ex_nflavors;
3801 } else { /* Handling of some defaults in absence of real secinfo: */
3802 flavs = def_flavs;
3803 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3804 nflavs = 2;
3805 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3806 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3807 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3808 nflavs = 1;
3809 flavs[0].pseudoflavor
3810 = svcauth_gss_flavor(exp->ex_client);
3811 } else {
3812 nflavs = 1;
3813 flavs[0].pseudoflavor
3814 = exp->ex_client->flavour->flavour;
3815 }
3816 }
3817
3818 supported = 0;
3819 p = xdr_reserve_space(xdr, 4);
3820 if (!p)
3821 return nfserr_resource;
3822 flavorsp = p++; /* to be backfilled later */
3823
3824 for (i = 0; i < nflavs; i++) {
3825 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3826 struct rpcsec_gss_info info;
3827
3828 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3829 supported++;
3830 p = xdr_reserve_space(xdr, 4 + 4 +
3831 XDR_LEN(info.oid.len) + 4 + 4);
3832 if (!p)
3833 return nfserr_resource;
3834 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3835 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3836 *p++ = cpu_to_be32(info.qop);
3837 *p++ = cpu_to_be32(info.service);
3838 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3839 supported++;
3840 p = xdr_reserve_space(xdr, 4);
3841 if (!p)
3842 return nfserr_resource;
3843 *p++ = cpu_to_be32(pf);
3844 } else {
3845 if (report)
3846 pr_warn("NFS: SECINFO: security flavor %u "
3847 "is not supported\n", pf);
3848 }
3849 }
3850
3851 if (nflavs != supported)
3852 report = false;
3853 *flavorsp = htonl(supported);
3854 return 0;
3855 }
3856
3857 static __be32
3858 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3859 struct nfsd4_secinfo *secinfo)
3860 {
3861 struct xdr_stream *xdr = &resp->xdr;
3862
3863 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
3864 }
3865
3866 static __be32
3867 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3868 struct nfsd4_secinfo_no_name *secinfo)
3869 {
3870 struct xdr_stream *xdr = &resp->xdr;
3871
3872 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
3873 }
3874
3875 /*
3876 * The SETATTR encode routine is special -- it always encodes a bitmap,
3877 * regardless of the error status.
3878 */
3879 static __be32
3880 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3881 {
3882 struct xdr_stream *xdr = &resp->xdr;
3883 __be32 *p;
3884
3885 p = xdr_reserve_space(xdr, 16);
3886 if (!p)
3887 return nfserr_resource;
3888 if (nfserr) {
3889 *p++ = cpu_to_be32(3);
3890 *p++ = cpu_to_be32(0);
3891 *p++ = cpu_to_be32(0);
3892 *p++ = cpu_to_be32(0);
3893 }
3894 else {
3895 *p++ = cpu_to_be32(3);
3896 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3897 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3898 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3899 }
3900 return nfserr;
3901 }
3902
3903 static __be32
3904 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3905 {
3906 struct xdr_stream *xdr = &resp->xdr;
3907 __be32 *p;
3908
3909 if (!nfserr) {
3910 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3911 if (!p)
3912 return nfserr_resource;
3913 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3914 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3915 NFS4_VERIFIER_SIZE);
3916 }
3917 else if (nfserr == nfserr_clid_inuse) {
3918 p = xdr_reserve_space(xdr, 8);
3919 if (!p)
3920 return nfserr_resource;
3921 *p++ = cpu_to_be32(0);
3922 *p++ = cpu_to_be32(0);
3923 }
3924 return nfserr;
3925 }
3926
3927 static __be32
3928 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3929 {
3930 struct xdr_stream *xdr = &resp->xdr;
3931 __be32 *p;
3932
3933 p = xdr_reserve_space(xdr, 16);
3934 if (!p)
3935 return nfserr_resource;
3936 *p++ = cpu_to_be32(write->wr_bytes_written);
3937 *p++ = cpu_to_be32(write->wr_how_written);
3938 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3939 NFS4_VERIFIER_SIZE);
3940 return 0;
3941 }
3942
3943 static __be32
3944 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3945 struct nfsd4_exchange_id *exid)
3946 {
3947 struct xdr_stream *xdr = &resp->xdr;
3948 __be32 *p;
3949 char *major_id;
3950 char *server_scope;
3951 int major_id_sz;
3952 int server_scope_sz;
3953 uint64_t minor_id = 0;
3954
3955 major_id = utsname()->nodename;
3956 major_id_sz = strlen(major_id);
3957 server_scope = utsname()->nodename;
3958 server_scope_sz = strlen(server_scope);
3959
3960 p = xdr_reserve_space(xdr,
3961 8 /* eir_clientid */ +
3962 4 /* eir_sequenceid */ +
3963 4 /* eir_flags */ +
3964 4 /* spr_how */);
3965 if (!p)
3966 return nfserr_resource;
3967
3968 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3969 *p++ = cpu_to_be32(exid->seqid);
3970 *p++ = cpu_to_be32(exid->flags);
3971
3972 *p++ = cpu_to_be32(exid->spa_how);
3973
3974 switch (exid->spa_how) {
3975 case SP4_NONE:
3976 break;
3977 case SP4_MACH_CRED:
3978 /* spo_must_enforce bitmap: */
3979 nfserr = nfsd4_encode_bitmap(xdr,
3980 exid->spo_must_enforce[0],
3981 exid->spo_must_enforce[1],
3982 exid->spo_must_enforce[2]);
3983 if (nfserr)
3984 return nfserr;
3985 /* spo_must_allow bitmap: */
3986 nfserr = nfsd4_encode_bitmap(xdr,
3987 exid->spo_must_allow[0],
3988 exid->spo_must_allow[1],
3989 exid->spo_must_allow[2]);
3990 if (nfserr)
3991 return nfserr;
3992 break;
3993 default:
3994 WARN_ON_ONCE(1);
3995 }
3996
3997 p = xdr_reserve_space(xdr,
3998 8 /* so_minor_id */ +
3999 4 /* so_major_id.len */ +
4000 (XDR_QUADLEN(major_id_sz) * 4) +
4001 4 /* eir_server_scope.len */ +
4002 (XDR_QUADLEN(server_scope_sz) * 4) +
4003 4 /* eir_server_impl_id.count (0) */);
4004 if (!p)
4005 return nfserr_resource;
4006
4007 /* The server_owner struct */
4008 p = xdr_encode_hyper(p, minor_id); /* Minor id */
4009 /* major id */
4010 p = xdr_encode_opaque(p, major_id, major_id_sz);
4011
4012 /* Server scope */
4013 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4014
4015 /* Implementation id */
4016 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
4017 return 0;
4018 }
4019
4020 static __be32
4021 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4022 struct nfsd4_create_session *sess)
4023 {
4024 struct xdr_stream *xdr = &resp->xdr;
4025 __be32 *p;
4026
4027 p = xdr_reserve_space(xdr, 24);
4028 if (!p)
4029 return nfserr_resource;
4030 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4031 NFS4_MAX_SESSIONID_LEN);
4032 *p++ = cpu_to_be32(sess->seqid);
4033 *p++ = cpu_to_be32(sess->flags);
4034
4035 p = xdr_reserve_space(xdr, 28);
4036 if (!p)
4037 return nfserr_resource;
4038 *p++ = cpu_to_be32(0); /* headerpadsz */
4039 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4040 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4041 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4042 *p++ = cpu_to_be32(sess->fore_channel.maxops);
4043 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4044 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4045
4046 if (sess->fore_channel.nr_rdma_attrs) {
4047 p = xdr_reserve_space(xdr, 4);
4048 if (!p)
4049 return nfserr_resource;
4050 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4051 }
4052
4053 p = xdr_reserve_space(xdr, 28);
4054 if (!p)
4055 return nfserr_resource;
4056 *p++ = cpu_to_be32(0); /* headerpadsz */
4057 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4058 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4059 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4060 *p++ = cpu_to_be32(sess->back_channel.maxops);
4061 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4062 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4063
4064 if (sess->back_channel.nr_rdma_attrs) {
4065 p = xdr_reserve_space(xdr, 4);
4066 if (!p)
4067 return nfserr_resource;
4068 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4069 }
4070 return 0;
4071 }
4072
4073 static __be32
4074 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4075 struct nfsd4_sequence *seq)
4076 {
4077 struct xdr_stream *xdr = &resp->xdr;
4078 __be32 *p;
4079
4080 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4081 if (!p)
4082 return nfserr_resource;
4083 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4084 NFS4_MAX_SESSIONID_LEN);
4085 *p++ = cpu_to_be32(seq->seqid);
4086 *p++ = cpu_to_be32(seq->slotid);
4087 /* Note slotid's are numbered from zero: */
4088 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4089 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4090 *p++ = cpu_to_be32(seq->status_flags);
4091
4092 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4093 return 0;
4094 }
4095
4096 static __be32
4097 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4098 struct nfsd4_test_stateid *test_stateid)
4099 {
4100 struct xdr_stream *xdr = &resp->xdr;
4101 struct nfsd4_test_stateid_id *stateid, *next;
4102 __be32 *p;
4103
4104 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4105 if (!p)
4106 return nfserr_resource;
4107 *p++ = htonl(test_stateid->ts_num_ids);
4108
4109 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4110 *p++ = stateid->ts_id_status;
4111 }
4112
4113 return 0;
4114 }
4115
4116 #ifdef CONFIG_NFSD_PNFS
4117 static __be32
4118 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4119 struct nfsd4_getdeviceinfo *gdev)
4120 {
4121 struct xdr_stream *xdr = &resp->xdr;
4122 const struct nfsd4_layout_ops *ops;
4123 u32 starting_len = xdr->buf->len, needed_len;
4124 __be32 *p;
4125
4126 p = xdr_reserve_space(xdr, 4);
4127 if (!p)
4128 return nfserr_resource;
4129
4130 *p++ = cpu_to_be32(gdev->gd_layout_type);
4131
4132 /* If maxcount is 0 then just update notifications */
4133 if (gdev->gd_maxcount != 0) {
4134 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4135 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4136 if (nfserr) {
4137 /*
4138 * We don't bother to burden the layout drivers with
4139 * enforcing gd_maxcount, just tell the client to
4140 * come back with a bigger buffer if it's not enough.
4141 */
4142 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4143 goto toosmall;
4144 return nfserr;
4145 }
4146 }
4147
4148 if (gdev->gd_notify_types) {
4149 p = xdr_reserve_space(xdr, 4 + 4);
4150 if (!p)
4151 return nfserr_resource;
4152 *p++ = cpu_to_be32(1); /* bitmap length */
4153 *p++ = cpu_to_be32(gdev->gd_notify_types);
4154 } else {
4155 p = xdr_reserve_space(xdr, 4);
4156 if (!p)
4157 return nfserr_resource;
4158 *p++ = 0;
4159 }
4160
4161 return 0;
4162 toosmall:
4163 dprintk("%s: maxcount too small\n", __func__);
4164 needed_len = xdr->buf->len + 4 /* notifications */;
4165 xdr_truncate_encode(xdr, starting_len);
4166 p = xdr_reserve_space(xdr, 4);
4167 if (!p)
4168 return nfserr_resource;
4169 *p++ = cpu_to_be32(needed_len);
4170 return nfserr_toosmall;
4171 }
4172
4173 static __be32
4174 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4175 struct nfsd4_layoutget *lgp)
4176 {
4177 struct xdr_stream *xdr = &resp->xdr;
4178 const struct nfsd4_layout_ops *ops;
4179 __be32 *p;
4180
4181 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4182 if (!p)
4183 return nfserr_resource;
4184
4185 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4186 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4187 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4188 sizeof(stateid_opaque_t));
4189
4190 *p++ = cpu_to_be32(1); /* we always return a single layout */
4191 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4192 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4193 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4194 *p++ = cpu_to_be32(lgp->lg_layout_type);
4195
4196 ops = nfsd4_layout_ops[lgp->lg_layout_type];
4197 return ops->encode_layoutget(xdr, lgp);
4198 }
4199
4200 static __be32
4201 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4202 struct nfsd4_layoutcommit *lcp)
4203 {
4204 struct xdr_stream *xdr = &resp->xdr;
4205 __be32 *p;
4206
4207 p = xdr_reserve_space(xdr, 4);
4208 if (!p)
4209 return nfserr_resource;
4210 *p++ = cpu_to_be32(lcp->lc_size_chg);
4211 if (lcp->lc_size_chg) {
4212 p = xdr_reserve_space(xdr, 8);
4213 if (!p)
4214 return nfserr_resource;
4215 p = xdr_encode_hyper(p, lcp->lc_newsize);
4216 }
4217
4218 return 0;
4219 }
4220
4221 static __be32
4222 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4223 struct nfsd4_layoutreturn *lrp)
4224 {
4225 struct xdr_stream *xdr = &resp->xdr;
4226 __be32 *p;
4227
4228 p = xdr_reserve_space(xdr, 4);
4229 if (!p)
4230 return nfserr_resource;
4231 *p++ = cpu_to_be32(lrp->lrs_present);
4232 if (lrp->lrs_present)
4233 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4234 return 0;
4235 }
4236 #endif /* CONFIG_NFSD_PNFS */
4237
4238 static __be32
4239 nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
4240 struct nfsd42_write_res *write, bool sync)
4241 {
4242 __be32 *p;
4243 p = xdr_reserve_space(&resp->xdr, 4);
4244 if (!p)
4245 return nfserr_resource;
4246
4247 if (sync)
4248 *p++ = cpu_to_be32(0);
4249 else {
4250 __be32 nfserr;
4251 *p++ = cpu_to_be32(1);
4252 nfserr = nfsd4_encode_stateid(&resp->xdr, &write->cb_stateid);
4253 if (nfserr)
4254 return nfserr;
4255 }
4256 p = xdr_reserve_space(&resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
4257 if (!p)
4258 return nfserr_resource;
4259
4260 p = xdr_encode_hyper(p, write->wr_bytes_written);
4261 *p++ = cpu_to_be32(write->wr_stable_how);
4262 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4263 NFS4_VERIFIER_SIZE);
4264 return nfs_ok;
4265 }
4266
4267 static __be32
4268 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4269 struct nfsd4_copy *copy)
4270 {
4271 __be32 *p;
4272
4273 nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
4274 copy->cp_synchronous);
4275 if (nfserr)
4276 return nfserr;
4277
4278 p = xdr_reserve_space(&resp->xdr, 4 + 4);
4279 *p++ = xdr_one; /* cr_consecutive */
4280 *p++ = cpu_to_be32(copy->cp_synchronous);
4281 return 0;
4282 }
4283
4284 static __be32
4285 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
4286 struct nfsd4_offload_status *os)
4287 {
4288 struct xdr_stream *xdr = &resp->xdr;
4289 __be32 *p;
4290
4291 p = xdr_reserve_space(xdr, 8 + 4);
4292 if (!p)
4293 return nfserr_resource;
4294 p = xdr_encode_hyper(p, os->count);
4295 *p++ = cpu_to_be32(0);
4296
4297 return nfserr;
4298 }
4299
4300 static __be32
4301 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4302 struct nfsd4_seek *seek)
4303 {
4304 __be32 *p;
4305
4306 p = xdr_reserve_space(&resp->xdr, 4 + 8);
4307 *p++ = cpu_to_be32(seek->seek_eof);
4308 p = xdr_encode_hyper(p, seek->seek_pos);
4309
4310 return 0;
4311 }
4312
4313 static __be32
4314 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4315 {
4316 return nfserr;
4317 }
4318
4319 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4320
4321 /*
4322 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4323 * since we don't need to filter out obsolete ops as this is
4324 * done in the decoding phase.
4325 */
4326 static const nfsd4_enc nfsd4_enc_ops[] = {
4327 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
4328 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
4329 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
4330 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
4331 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
4332 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4333 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
4334 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
4335 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
4336 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
4337 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
4338 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
4339 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
4340 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
4341 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4342 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
4343 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
4344 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
4345 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
4346 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
4347 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
4348 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
4349 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
4350 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
4351 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
4352 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
4353 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
4354 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
4355 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
4356 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
4357 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
4358 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
4359 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
4360 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4361 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4362 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
4363 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
4364
4365 /* NFSv4.1 operations */
4366 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
4367 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4368 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
4369 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
4370 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
4371 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
4372 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4373 #ifdef CONFIG_NFSD_PNFS
4374 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4375 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4376 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit,
4377 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget,
4378 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn,
4379 #else
4380 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
4381 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4382 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
4383 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
4384 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4385 #endif
4386 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4387 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
4388 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
4389 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
4390 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4391 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
4392 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
4393
4394 /* NFSv4.2 operations */
4395 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4396 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy,
4397 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
4398 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4399 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
4400 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
4401 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
4402 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
4403 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_offload_status,
4404 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
4405 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
4406 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
4407 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop,
4408 };
4409
4410 /*
4411 * Calculate whether we still have space to encode repsize bytes.
4412 * There are two considerations:
4413 * - For NFS versions >=4.1, the size of the reply must stay within
4414 * session limits
4415 * - For all NFS versions, we must stay within limited preallocated
4416 * buffer space.
4417 *
4418 * This is called before the operation is processed, so can only provide
4419 * an upper estimate. For some nonidempotent operations (such as
4420 * getattr), it's not necessarily a problem if that estimate is wrong,
4421 * as we can fail it after processing without significant side effects.
4422 */
4423 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4424 {
4425 struct xdr_buf *buf = &resp->rqstp->rq_res;
4426 struct nfsd4_slot *slot = resp->cstate.slot;
4427
4428 if (buf->len + respsize <= buf->buflen)
4429 return nfs_ok;
4430 if (!nfsd4_has_session(&resp->cstate))
4431 return nfserr_resource;
4432 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4433 WARN_ON_ONCE(1);
4434 return nfserr_rep_too_big_to_cache;
4435 }
4436 return nfserr_rep_too_big;
4437 }
4438
4439 void
4440 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4441 {
4442 struct xdr_stream *xdr = &resp->xdr;
4443 struct nfs4_stateowner *so = resp->cstate.replay_owner;
4444 struct svc_rqst *rqstp = resp->rqstp;
4445 const struct nfsd4_operation *opdesc = op->opdesc;
4446 int post_err_offset;
4447 nfsd4_enc encoder;
4448 __be32 *p;
4449
4450 p = xdr_reserve_space(xdr, 8);
4451 if (!p) {
4452 WARN_ON_ONCE(1);
4453 return;
4454 }
4455 *p++ = cpu_to_be32(op->opnum);
4456 post_err_offset = xdr->buf->len;
4457
4458 if (op->opnum == OP_ILLEGAL)
4459 goto status;
4460 if (op->status && opdesc &&
4461 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
4462 goto status;
4463 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4464 !nfsd4_enc_ops[op->opnum]);
4465 encoder = nfsd4_enc_ops[op->opnum];
4466 op->status = encoder(resp, op->status, &op->u);
4467 if (opdesc && opdesc->op_release)
4468 opdesc->op_release(&op->u);
4469 xdr_commit_encode(xdr);
4470
4471 /* nfsd4_check_resp_size guarantees enough room for error status */
4472 if (!op->status) {
4473 int space_needed = 0;
4474 if (!nfsd4_last_compound_op(rqstp))
4475 space_needed = COMPOUND_ERR_SLACK_SPACE;
4476 op->status = nfsd4_check_resp_size(resp, space_needed);
4477 }
4478 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4479 struct nfsd4_slot *slot = resp->cstate.slot;
4480
4481 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4482 op->status = nfserr_rep_too_big_to_cache;
4483 else
4484 op->status = nfserr_rep_too_big;
4485 }
4486 if (op->status == nfserr_resource ||
4487 op->status == nfserr_rep_too_big ||
4488 op->status == nfserr_rep_too_big_to_cache) {
4489 /*
4490 * The operation may have already been encoded or
4491 * partially encoded. No op returns anything additional
4492 * in the case of one of these three errors, so we can
4493 * just truncate back to after the status. But it's a
4494 * bug if we had to do this on a non-idempotent op:
4495 */
4496 warn_on_nonidempotent_op(op);
4497 xdr_truncate_encode(xdr, post_err_offset);
4498 }
4499 if (so) {
4500 int len = xdr->buf->len - post_err_offset;
4501
4502 so->so_replay.rp_status = op->status;
4503 so->so_replay.rp_buflen = len;
4504 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4505 so->so_replay.rp_buf, len);
4506 }
4507 status:
4508 /* Note that op->status is already in network byte order: */
4509 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4510 }
4511
4512 /*
4513 * Encode the reply stored in the stateowner reply cache
4514 *
4515 * XDR note: do not encode rp->rp_buflen: the buffer contains the
4516 * previously sent already encoded operation.
4517 */
4518 void
4519 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4520 {
4521 __be32 *p;
4522 struct nfs4_replay *rp = op->replay;
4523
4524 BUG_ON(!rp);
4525
4526 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4527 if (!p) {
4528 WARN_ON_ONCE(1);
4529 return;
4530 }
4531 *p++ = cpu_to_be32(op->opnum);
4532 *p++ = rp->rp_status; /* already xdr'ed */
4533
4534 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4535 }
4536
4537 int
4538 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4539 {
4540 return xdr_ressize_check(rqstp, p);
4541 }
4542
4543 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4544 {
4545 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4546
4547 if (args->ops != args->iops) {
4548 kfree(args->ops);
4549 args->ops = args->iops;
4550 }
4551 kfree(args->tmpp);
4552 args->tmpp = NULL;
4553 while (args->to_free) {
4554 struct svcxdr_tmpbuf *tb = args->to_free;
4555 args->to_free = tb->next;
4556 kfree(tb);
4557 }
4558 }
4559
4560 int
4561 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4562 {
4563 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4564
4565 if (rqstp->rq_arg.head[0].iov_len % 4) {
4566 /* client is nuts */
4567 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4568 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4569 return 0;
4570 }
4571 args->p = p;
4572 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4573 args->pagelist = rqstp->rq_arg.pages;
4574 args->pagelen = rqstp->rq_arg.page_len;
4575 args->tail = false;
4576 args->tmpp = NULL;
4577 args->to_free = NULL;
4578 args->ops = args->iops;
4579 args->rqstp = rqstp;
4580
4581 return !nfsd4_decode_compound(args);
4582 }
4583
4584 int
4585 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4586 {
4587 /*
4588 * All that remains is to write the tag and operation count...
4589 */
4590 struct nfsd4_compoundres *resp = rqstp->rq_resp;
4591 struct xdr_buf *buf = resp->xdr.buf;
4592
4593 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4594 buf->tail[0].iov_len);
4595
4596 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4597
4598 p = resp->tagp;
4599 *p++ = htonl(resp->taglen);
4600 memcpy(p, resp->tag, resp->taglen);
4601 p += XDR_QUADLEN(resp->taglen);
4602 *p++ = htonl(resp->opcnt);
4603
4604 nfsd4_sequence_done(resp);
4605 return 1;
4606 }
4607
4608 /*
4609 * Local variables:
4610 * c-basic-offset: 8
4611 * End:
4612 */
Mirror of linux-2.6-arm at arm.linux.org.uk