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nfsd4: teach encoders to handle reserve_space failures
[deliverable/linux.git] / fs / nfsd / nfs4xdr.c
1 /*
2 * Server-side XDR for NFSv4
3 *
4 * Copyright (c) 2002 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <andros@umich.edu>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 * TODO: Neil Brown made the following observation: We currently
36 * initially reserve NFSD_BUFSIZE space on the transmit queue and
37 * never release any of that until the request is complete.
38 * It would be good to calculate a new maximum response size while
39 * decoding the COMPOUND, and call svc_reserve with this number
40 * at the end of nfs4svc_decode_compoundargs.
41 */
42
43 #include <linux/slab.h>
44 #include <linux/namei.h>
45 #include <linux/statfs.h>
46 #include <linux/utsname.h>
47 #include <linux/pagemap.h>
48 #include <linux/sunrpc/svcauth_gss.h>
49
50 #include "idmap.h"
51 #include "acl.h"
52 #include "xdr4.h"
53 #include "vfs.h"
54 #include "state.h"
55 #include "cache.h"
56 #include "netns.h"
57
58 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
59 #include <linux/security.h>
60 #endif
61
62
63 #define NFSDDBG_FACILITY NFSDDBG_XDR
64
65 /*
66 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
67 * directory in order to indicate to the client that a filesystem boundary is present
68 * We use a fixed fsid for a referral
69 */
70 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
71 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
72
73 static __be32
74 check_filename(char *str, int len)
75 {
76 int i;
77
78 if (len == 0)
79 return nfserr_inval;
80 if (isdotent(str, len))
81 return nfserr_badname;
82 for (i = 0; i < len; i++)
83 if (str[i] == '/')
84 return nfserr_badname;
85 return 0;
86 }
87
88 #define DECODE_HEAD \
89 __be32 *p; \
90 __be32 status
91 #define DECODE_TAIL \
92 status = 0; \
93 out: \
94 return status; \
95 xdr_error: \
96 dprintk("NFSD: xdr error (%s:%d)\n", \
97 __FILE__, __LINE__); \
98 status = nfserr_bad_xdr; \
99 goto out
100
101 #define READ32(x) (x) = ntohl(*p++)
102 #define READ64(x) do { \
103 (x) = (u64)ntohl(*p++) << 32; \
104 (x) |= ntohl(*p++); \
105 } while (0)
106 #define READMEM(x,nbytes) do { \
107 x = (char *)p; \
108 p += XDR_QUADLEN(nbytes); \
109 } while (0)
110 #define SAVEMEM(x,nbytes) do { \
111 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
112 savemem(argp, p, nbytes) : \
113 (char *)p)) { \
114 dprintk("NFSD: xdr error (%s:%d)\n", \
115 __FILE__, __LINE__); \
116 goto xdr_error; \
117 } \
118 p += XDR_QUADLEN(nbytes); \
119 } while (0)
120 #define COPYMEM(x,nbytes) do { \
121 memcpy((x), p, nbytes); \
122 p += XDR_QUADLEN(nbytes); \
123 } while (0)
124
125 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
126 #define READ_BUF(nbytes) do { \
127 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
128 p = argp->p; \
129 argp->p += XDR_QUADLEN(nbytes); \
130 } else if (!(p = read_buf(argp, nbytes))) { \
131 dprintk("NFSD: xdr error (%s:%d)\n", \
132 __FILE__, __LINE__); \
133 goto xdr_error; \
134 } \
135 } while (0)
136
137 static void next_decode_page(struct nfsd4_compoundargs *argp)
138 {
139 argp->p = page_address(argp->pagelist[0]);
140 argp->pagelist++;
141 if (argp->pagelen < PAGE_SIZE) {
142 argp->end = argp->p + (argp->pagelen>>2);
143 argp->pagelen = 0;
144 } else {
145 argp->end = argp->p + (PAGE_SIZE>>2);
146 argp->pagelen -= PAGE_SIZE;
147 }
148 }
149
150 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
151 {
152 /* We want more bytes than seem to be available.
153 * Maybe we need a new page, maybe we have just run out
154 */
155 unsigned int avail = (char *)argp->end - (char *)argp->p;
156 __be32 *p;
157 if (avail + argp->pagelen < nbytes)
158 return NULL;
159 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
160 return NULL;
161 /* ok, we can do it with the current plus the next page */
162 if (nbytes <= sizeof(argp->tmp))
163 p = argp->tmp;
164 else {
165 kfree(argp->tmpp);
166 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
167 if (!p)
168 return NULL;
169
170 }
171 /*
172 * The following memcpy is safe because read_buf is always
173 * called with nbytes > avail, and the two cases above both
174 * guarantee p points to at least nbytes bytes.
175 */
176 memcpy(p, argp->p, avail);
177 next_decode_page(argp);
178 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
179 argp->p += XDR_QUADLEN(nbytes - avail);
180 return p;
181 }
182
183 static int zero_clientid(clientid_t *clid)
184 {
185 return (clid->cl_boot == 0) && (clid->cl_id == 0);
186 }
187
188 /**
189 * defer_free - mark an allocation as deferred freed
190 * @argp: NFSv4 compound argument structure to be freed with
191 * @release: release callback to free @p, typically kfree()
192 * @p: pointer to be freed
193 *
194 * Marks @p to be freed when processing the compound operation
195 * described in @argp finishes.
196 */
197 static int
198 defer_free(struct nfsd4_compoundargs *argp,
199 void (*release)(const void *), void *p)
200 {
201 struct tmpbuf *tb;
202
203 tb = kmalloc(sizeof(*tb), GFP_KERNEL);
204 if (!tb)
205 return -ENOMEM;
206 tb->buf = p;
207 tb->release = release;
208 tb->next = argp->to_free;
209 argp->to_free = tb;
210 return 0;
211 }
212
213 /**
214 * savemem - duplicate a chunk of memory for later processing
215 * @argp: NFSv4 compound argument structure to be freed with
216 * @p: pointer to be duplicated
217 * @nbytes: length to be duplicated
218 *
219 * Returns a pointer to a copy of @nbytes bytes of memory at @p
220 * that are preserved until processing of the NFSv4 compound
221 * operation described by @argp finishes.
222 */
223 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
224 {
225 if (p == argp->tmp) {
226 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
227 if (!p)
228 return NULL;
229 } else {
230 BUG_ON(p != argp->tmpp);
231 argp->tmpp = NULL;
232 }
233 if (defer_free(argp, kfree, p)) {
234 kfree(p);
235 return NULL;
236 } else
237 return (char *)p;
238 }
239
240 static __be32
241 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
242 {
243 u32 bmlen;
244 DECODE_HEAD;
245
246 bmval[0] = 0;
247 bmval[1] = 0;
248 bmval[2] = 0;
249
250 READ_BUF(4);
251 READ32(bmlen);
252 if (bmlen > 1000)
253 goto xdr_error;
254
255 READ_BUF(bmlen << 2);
256 if (bmlen > 0)
257 READ32(bmval[0]);
258 if (bmlen > 1)
259 READ32(bmval[1]);
260 if (bmlen > 2)
261 READ32(bmval[2]);
262
263 DECODE_TAIL;
264 }
265
266 static __be32
267 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
268 struct iattr *iattr, struct nfs4_acl **acl,
269 struct xdr_netobj *label)
270 {
271 int expected_len, len = 0;
272 u32 dummy32;
273 char *buf;
274
275 DECODE_HEAD;
276 iattr->ia_valid = 0;
277 if ((status = nfsd4_decode_bitmap(argp, bmval)))
278 return status;
279
280 READ_BUF(4);
281 READ32(expected_len);
282
283 if (bmval[0] & FATTR4_WORD0_SIZE) {
284 READ_BUF(8);
285 len += 8;
286 READ64(iattr->ia_size);
287 iattr->ia_valid |= ATTR_SIZE;
288 }
289 if (bmval[0] & FATTR4_WORD0_ACL) {
290 u32 nace;
291 struct nfs4_ace *ace;
292
293 READ_BUF(4); len += 4;
294 READ32(nace);
295
296 if (nace > NFS4_ACL_MAX)
297 return nfserr_fbig;
298
299 *acl = nfs4_acl_new(nace);
300 if (*acl == NULL)
301 return nfserr_jukebox;
302
303 defer_free(argp, kfree, *acl);
304
305 (*acl)->naces = nace;
306 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
307 READ_BUF(16); len += 16;
308 READ32(ace->type);
309 READ32(ace->flag);
310 READ32(ace->access_mask);
311 READ32(dummy32);
312 READ_BUF(dummy32);
313 len += XDR_QUADLEN(dummy32) << 2;
314 READMEM(buf, dummy32);
315 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
316 status = nfs_ok;
317 if (ace->whotype != NFS4_ACL_WHO_NAMED)
318 ;
319 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
320 status = nfsd_map_name_to_gid(argp->rqstp,
321 buf, dummy32, &ace->who_gid);
322 else
323 status = nfsd_map_name_to_uid(argp->rqstp,
324 buf, dummy32, &ace->who_uid);
325 if (status)
326 return status;
327 }
328 } else
329 *acl = NULL;
330 if (bmval[1] & FATTR4_WORD1_MODE) {
331 READ_BUF(4);
332 len += 4;
333 READ32(iattr->ia_mode);
334 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
335 iattr->ia_valid |= ATTR_MODE;
336 }
337 if (bmval[1] & FATTR4_WORD1_OWNER) {
338 READ_BUF(4);
339 len += 4;
340 READ32(dummy32);
341 READ_BUF(dummy32);
342 len += (XDR_QUADLEN(dummy32) << 2);
343 READMEM(buf, dummy32);
344 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
345 return status;
346 iattr->ia_valid |= ATTR_UID;
347 }
348 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
349 READ_BUF(4);
350 len += 4;
351 READ32(dummy32);
352 READ_BUF(dummy32);
353 len += (XDR_QUADLEN(dummy32) << 2);
354 READMEM(buf, dummy32);
355 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
356 return status;
357 iattr->ia_valid |= ATTR_GID;
358 }
359 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
360 READ_BUF(4);
361 len += 4;
362 READ32(dummy32);
363 switch (dummy32) {
364 case NFS4_SET_TO_CLIENT_TIME:
365 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
366 all 32 bits of 'nseconds'. */
367 READ_BUF(12);
368 len += 12;
369 READ64(iattr->ia_atime.tv_sec);
370 READ32(iattr->ia_atime.tv_nsec);
371 if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
372 return nfserr_inval;
373 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
374 break;
375 case NFS4_SET_TO_SERVER_TIME:
376 iattr->ia_valid |= ATTR_ATIME;
377 break;
378 default:
379 goto xdr_error;
380 }
381 }
382 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
383 READ_BUF(4);
384 len += 4;
385 READ32(dummy32);
386 switch (dummy32) {
387 case NFS4_SET_TO_CLIENT_TIME:
388 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
389 all 32 bits of 'nseconds'. */
390 READ_BUF(12);
391 len += 12;
392 READ64(iattr->ia_mtime.tv_sec);
393 READ32(iattr->ia_mtime.tv_nsec);
394 if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
395 return nfserr_inval;
396 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
397 break;
398 case NFS4_SET_TO_SERVER_TIME:
399 iattr->ia_valid |= ATTR_MTIME;
400 break;
401 default:
402 goto xdr_error;
403 }
404 }
405
406 label->len = 0;
407 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
408 if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
409 READ_BUF(4);
410 len += 4;
411 READ32(dummy32); /* lfs: we don't use it */
412 READ_BUF(4);
413 len += 4;
414 READ32(dummy32); /* pi: we don't use it either */
415 READ_BUF(4);
416 len += 4;
417 READ32(dummy32);
418 READ_BUF(dummy32);
419 if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
420 return nfserr_badlabel;
421 len += (XDR_QUADLEN(dummy32) << 2);
422 READMEM(buf, dummy32);
423 label->data = kzalloc(dummy32 + 1, GFP_KERNEL);
424 if (!label->data)
425 return nfserr_jukebox;
426 label->len = dummy32;
427 defer_free(argp, kfree, label->data);
428 memcpy(label->data, buf, dummy32);
429 }
430 #endif
431
432 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
433 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
434 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
435 READ_BUF(expected_len - len);
436 else if (len != expected_len)
437 goto xdr_error;
438
439 DECODE_TAIL;
440 }
441
442 static __be32
443 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
444 {
445 DECODE_HEAD;
446
447 READ_BUF(sizeof(stateid_t));
448 READ32(sid->si_generation);
449 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
450
451 DECODE_TAIL;
452 }
453
454 static __be32
455 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
456 {
457 DECODE_HEAD;
458
459 READ_BUF(4);
460 READ32(access->ac_req_access);
461
462 DECODE_TAIL;
463 }
464
465 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
466 {
467 DECODE_HEAD;
468 u32 dummy, uid, gid;
469 char *machine_name;
470 int i;
471 int nr_secflavs;
472
473 /* callback_sec_params4 */
474 READ_BUF(4);
475 READ32(nr_secflavs);
476 if (nr_secflavs)
477 cbs->flavor = (u32)(-1);
478 else
479 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
480 cbs->flavor = 0;
481 for (i = 0; i < nr_secflavs; ++i) {
482 READ_BUF(4);
483 READ32(dummy);
484 switch (dummy) {
485 case RPC_AUTH_NULL:
486 /* Nothing to read */
487 if (cbs->flavor == (u32)(-1))
488 cbs->flavor = RPC_AUTH_NULL;
489 break;
490 case RPC_AUTH_UNIX:
491 READ_BUF(8);
492 /* stamp */
493 READ32(dummy);
494
495 /* machine name */
496 READ32(dummy);
497 READ_BUF(dummy);
498 SAVEMEM(machine_name, dummy);
499
500 /* uid, gid */
501 READ_BUF(8);
502 READ32(uid);
503 READ32(gid);
504
505 /* more gids */
506 READ_BUF(4);
507 READ32(dummy);
508 READ_BUF(dummy * 4);
509 if (cbs->flavor == (u32)(-1)) {
510 kuid_t kuid = make_kuid(&init_user_ns, uid);
511 kgid_t kgid = make_kgid(&init_user_ns, gid);
512 if (uid_valid(kuid) && gid_valid(kgid)) {
513 cbs->uid = kuid;
514 cbs->gid = kgid;
515 cbs->flavor = RPC_AUTH_UNIX;
516 } else {
517 dprintk("RPC_AUTH_UNIX with invalid"
518 "uid or gid ignoring!\n");
519 }
520 }
521 break;
522 case RPC_AUTH_GSS:
523 dprintk("RPC_AUTH_GSS callback secflavor "
524 "not supported!\n");
525 READ_BUF(8);
526 /* gcbp_service */
527 READ32(dummy);
528 /* gcbp_handle_from_server */
529 READ32(dummy);
530 READ_BUF(dummy);
531 p += XDR_QUADLEN(dummy);
532 /* gcbp_handle_from_client */
533 READ_BUF(4);
534 READ32(dummy);
535 READ_BUF(dummy);
536 break;
537 default:
538 dprintk("Illegal callback secflavor\n");
539 return nfserr_inval;
540 }
541 }
542 DECODE_TAIL;
543 }
544
545 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
546 {
547 DECODE_HEAD;
548
549 READ_BUF(4);
550 READ32(bc->bc_cb_program);
551 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
552
553 DECODE_TAIL;
554 }
555
556 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
557 {
558 DECODE_HEAD;
559
560 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
561 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
562 READ32(bcts->dir);
563 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
564 * could help us figure out we should be using it. */
565 DECODE_TAIL;
566 }
567
568 static __be32
569 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
570 {
571 DECODE_HEAD;
572
573 READ_BUF(4);
574 READ32(close->cl_seqid);
575 return nfsd4_decode_stateid(argp, &close->cl_stateid);
576
577 DECODE_TAIL;
578 }
579
580
581 static __be32
582 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
583 {
584 DECODE_HEAD;
585
586 READ_BUF(12);
587 READ64(commit->co_offset);
588 READ32(commit->co_count);
589
590 DECODE_TAIL;
591 }
592
593 static __be32
594 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
595 {
596 DECODE_HEAD;
597
598 READ_BUF(4);
599 READ32(create->cr_type);
600 switch (create->cr_type) {
601 case NF4LNK:
602 READ_BUF(4);
603 READ32(create->cr_linklen);
604 READ_BUF(create->cr_linklen);
605 SAVEMEM(create->cr_linkname, create->cr_linklen);
606 break;
607 case NF4BLK:
608 case NF4CHR:
609 READ_BUF(8);
610 READ32(create->cr_specdata1);
611 READ32(create->cr_specdata2);
612 break;
613 case NF4SOCK:
614 case NF4FIFO:
615 case NF4DIR:
616 default:
617 break;
618 }
619
620 READ_BUF(4);
621 READ32(create->cr_namelen);
622 READ_BUF(create->cr_namelen);
623 SAVEMEM(create->cr_name, create->cr_namelen);
624 if ((status = check_filename(create->cr_name, create->cr_namelen)))
625 return status;
626
627 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
628 &create->cr_acl, &create->cr_label);
629 if (status)
630 goto out;
631
632 DECODE_TAIL;
633 }
634
635 static inline __be32
636 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
637 {
638 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
639 }
640
641 static inline __be32
642 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
643 {
644 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
645 }
646
647 static __be32
648 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
649 {
650 DECODE_HEAD;
651
652 READ_BUF(4);
653 READ32(link->li_namelen);
654 READ_BUF(link->li_namelen);
655 SAVEMEM(link->li_name, link->li_namelen);
656 if ((status = check_filename(link->li_name, link->li_namelen)))
657 return status;
658
659 DECODE_TAIL;
660 }
661
662 static __be32
663 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
664 {
665 DECODE_HEAD;
666
667 /*
668 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
669 */
670 READ_BUF(28);
671 READ32(lock->lk_type);
672 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
673 goto xdr_error;
674 READ32(lock->lk_reclaim);
675 READ64(lock->lk_offset);
676 READ64(lock->lk_length);
677 READ32(lock->lk_is_new);
678
679 if (lock->lk_is_new) {
680 READ_BUF(4);
681 READ32(lock->lk_new_open_seqid);
682 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
683 if (status)
684 return status;
685 READ_BUF(8 + sizeof(clientid_t));
686 READ32(lock->lk_new_lock_seqid);
687 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
688 READ32(lock->lk_new_owner.len);
689 READ_BUF(lock->lk_new_owner.len);
690 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
691 } else {
692 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
693 if (status)
694 return status;
695 READ_BUF(4);
696 READ32(lock->lk_old_lock_seqid);
697 }
698
699 DECODE_TAIL;
700 }
701
702 static __be32
703 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
704 {
705 DECODE_HEAD;
706
707 READ_BUF(32);
708 READ32(lockt->lt_type);
709 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
710 goto xdr_error;
711 READ64(lockt->lt_offset);
712 READ64(lockt->lt_length);
713 COPYMEM(&lockt->lt_clientid, 8);
714 READ32(lockt->lt_owner.len);
715 READ_BUF(lockt->lt_owner.len);
716 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
717
718 DECODE_TAIL;
719 }
720
721 static __be32
722 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
723 {
724 DECODE_HEAD;
725
726 READ_BUF(8);
727 READ32(locku->lu_type);
728 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
729 goto xdr_error;
730 READ32(locku->lu_seqid);
731 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
732 if (status)
733 return status;
734 READ_BUF(16);
735 READ64(locku->lu_offset);
736 READ64(locku->lu_length);
737
738 DECODE_TAIL;
739 }
740
741 static __be32
742 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
743 {
744 DECODE_HEAD;
745
746 READ_BUF(4);
747 READ32(lookup->lo_len);
748 READ_BUF(lookup->lo_len);
749 SAVEMEM(lookup->lo_name, lookup->lo_len);
750 if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
751 return status;
752
753 DECODE_TAIL;
754 }
755
756 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
757 {
758 __be32 *p;
759 u32 w;
760
761 READ_BUF(4);
762 READ32(w);
763 *share_access = w & NFS4_SHARE_ACCESS_MASK;
764 *deleg_want = w & NFS4_SHARE_WANT_MASK;
765 if (deleg_when)
766 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
767
768 switch (w & NFS4_SHARE_ACCESS_MASK) {
769 case NFS4_SHARE_ACCESS_READ:
770 case NFS4_SHARE_ACCESS_WRITE:
771 case NFS4_SHARE_ACCESS_BOTH:
772 break;
773 default:
774 return nfserr_bad_xdr;
775 }
776 w &= ~NFS4_SHARE_ACCESS_MASK;
777 if (!w)
778 return nfs_ok;
779 if (!argp->minorversion)
780 return nfserr_bad_xdr;
781 switch (w & NFS4_SHARE_WANT_MASK) {
782 case NFS4_SHARE_WANT_NO_PREFERENCE:
783 case NFS4_SHARE_WANT_READ_DELEG:
784 case NFS4_SHARE_WANT_WRITE_DELEG:
785 case NFS4_SHARE_WANT_ANY_DELEG:
786 case NFS4_SHARE_WANT_NO_DELEG:
787 case NFS4_SHARE_WANT_CANCEL:
788 break;
789 default:
790 return nfserr_bad_xdr;
791 }
792 w &= ~NFS4_SHARE_WANT_MASK;
793 if (!w)
794 return nfs_ok;
795
796 if (!deleg_when) /* open_downgrade */
797 return nfserr_inval;
798 switch (w) {
799 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
800 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
801 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
802 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
803 return nfs_ok;
804 }
805 xdr_error:
806 return nfserr_bad_xdr;
807 }
808
809 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
810 {
811 __be32 *p;
812
813 READ_BUF(4);
814 READ32(*x);
815 /* Note: unlinke access bits, deny bits may be zero. */
816 if (*x & ~NFS4_SHARE_DENY_BOTH)
817 return nfserr_bad_xdr;
818 return nfs_ok;
819 xdr_error:
820 return nfserr_bad_xdr;
821 }
822
823 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
824 {
825 __be32 *p;
826
827 READ_BUF(4);
828 READ32(o->len);
829
830 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
831 return nfserr_bad_xdr;
832
833 READ_BUF(o->len);
834 SAVEMEM(o->data, o->len);
835 return nfs_ok;
836 xdr_error:
837 return nfserr_bad_xdr;
838 }
839
840 static __be32
841 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
842 {
843 DECODE_HEAD;
844 u32 dummy;
845
846 memset(open->op_bmval, 0, sizeof(open->op_bmval));
847 open->op_iattr.ia_valid = 0;
848 open->op_openowner = NULL;
849
850 open->op_xdr_error = 0;
851 /* seqid, share_access, share_deny, clientid, ownerlen */
852 READ_BUF(4);
853 READ32(open->op_seqid);
854 /* decode, yet ignore deleg_when until supported */
855 status = nfsd4_decode_share_access(argp, &open->op_share_access,
856 &open->op_deleg_want, &dummy);
857 if (status)
858 goto xdr_error;
859 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
860 if (status)
861 goto xdr_error;
862 READ_BUF(sizeof(clientid_t));
863 COPYMEM(&open->op_clientid, sizeof(clientid_t));
864 status = nfsd4_decode_opaque(argp, &open->op_owner);
865 if (status)
866 goto xdr_error;
867 READ_BUF(4);
868 READ32(open->op_create);
869 switch (open->op_create) {
870 case NFS4_OPEN_NOCREATE:
871 break;
872 case NFS4_OPEN_CREATE:
873 READ_BUF(4);
874 READ32(open->op_createmode);
875 switch (open->op_createmode) {
876 case NFS4_CREATE_UNCHECKED:
877 case NFS4_CREATE_GUARDED:
878 status = nfsd4_decode_fattr(argp, open->op_bmval,
879 &open->op_iattr, &open->op_acl, &open->op_label);
880 if (status)
881 goto out;
882 break;
883 case NFS4_CREATE_EXCLUSIVE:
884 READ_BUF(NFS4_VERIFIER_SIZE);
885 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
886 break;
887 case NFS4_CREATE_EXCLUSIVE4_1:
888 if (argp->minorversion < 1)
889 goto xdr_error;
890 READ_BUF(NFS4_VERIFIER_SIZE);
891 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
892 status = nfsd4_decode_fattr(argp, open->op_bmval,
893 &open->op_iattr, &open->op_acl, &open->op_label);
894 if (status)
895 goto out;
896 break;
897 default:
898 goto xdr_error;
899 }
900 break;
901 default:
902 goto xdr_error;
903 }
904
905 /* open_claim */
906 READ_BUF(4);
907 READ32(open->op_claim_type);
908 switch (open->op_claim_type) {
909 case NFS4_OPEN_CLAIM_NULL:
910 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
911 READ_BUF(4);
912 READ32(open->op_fname.len);
913 READ_BUF(open->op_fname.len);
914 SAVEMEM(open->op_fname.data, open->op_fname.len);
915 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
916 return status;
917 break;
918 case NFS4_OPEN_CLAIM_PREVIOUS:
919 READ_BUF(4);
920 READ32(open->op_delegate_type);
921 break;
922 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
923 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
924 if (status)
925 return status;
926 READ_BUF(4);
927 READ32(open->op_fname.len);
928 READ_BUF(open->op_fname.len);
929 SAVEMEM(open->op_fname.data, open->op_fname.len);
930 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
931 return status;
932 break;
933 case NFS4_OPEN_CLAIM_FH:
934 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
935 if (argp->minorversion < 1)
936 goto xdr_error;
937 /* void */
938 break;
939 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
940 if (argp->minorversion < 1)
941 goto xdr_error;
942 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
943 if (status)
944 return status;
945 break;
946 default:
947 goto xdr_error;
948 }
949
950 DECODE_TAIL;
951 }
952
953 static __be32
954 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
955 {
956 DECODE_HEAD;
957
958 if (argp->minorversion >= 1)
959 return nfserr_notsupp;
960
961 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
962 if (status)
963 return status;
964 READ_BUF(4);
965 READ32(open_conf->oc_seqid);
966
967 DECODE_TAIL;
968 }
969
970 static __be32
971 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
972 {
973 DECODE_HEAD;
974
975 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
976 if (status)
977 return status;
978 READ_BUF(4);
979 READ32(open_down->od_seqid);
980 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
981 &open_down->od_deleg_want, NULL);
982 if (status)
983 return status;
984 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
985 if (status)
986 return status;
987 DECODE_TAIL;
988 }
989
990 static __be32
991 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
992 {
993 DECODE_HEAD;
994
995 READ_BUF(4);
996 READ32(putfh->pf_fhlen);
997 if (putfh->pf_fhlen > NFS4_FHSIZE)
998 goto xdr_error;
999 READ_BUF(putfh->pf_fhlen);
1000 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1001
1002 DECODE_TAIL;
1003 }
1004
1005 static __be32
1006 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1007 {
1008 if (argp->minorversion == 0)
1009 return nfs_ok;
1010 return nfserr_notsupp;
1011 }
1012
1013 static __be32
1014 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1015 {
1016 DECODE_HEAD;
1017
1018 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1019 if (status)
1020 return status;
1021 READ_BUF(12);
1022 READ64(read->rd_offset);
1023 READ32(read->rd_length);
1024
1025 DECODE_TAIL;
1026 }
1027
1028 static __be32
1029 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1030 {
1031 DECODE_HEAD;
1032
1033 READ_BUF(24);
1034 READ64(readdir->rd_cookie);
1035 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1036 READ32(readdir->rd_dircount); /* just in case you needed a useless field... */
1037 READ32(readdir->rd_maxcount);
1038 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1039 goto out;
1040
1041 DECODE_TAIL;
1042 }
1043
1044 static __be32
1045 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1046 {
1047 DECODE_HEAD;
1048
1049 READ_BUF(4);
1050 READ32(remove->rm_namelen);
1051 READ_BUF(remove->rm_namelen);
1052 SAVEMEM(remove->rm_name, remove->rm_namelen);
1053 if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1054 return status;
1055
1056 DECODE_TAIL;
1057 }
1058
1059 static __be32
1060 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1061 {
1062 DECODE_HEAD;
1063
1064 READ_BUF(4);
1065 READ32(rename->rn_snamelen);
1066 READ_BUF(rename->rn_snamelen + 4);
1067 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1068 READ32(rename->rn_tnamelen);
1069 READ_BUF(rename->rn_tnamelen);
1070 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1071 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1072 return status;
1073 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1074 return status;
1075
1076 DECODE_TAIL;
1077 }
1078
1079 static __be32
1080 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1081 {
1082 DECODE_HEAD;
1083
1084 if (argp->minorversion >= 1)
1085 return nfserr_notsupp;
1086
1087 READ_BUF(sizeof(clientid_t));
1088 COPYMEM(clientid, sizeof(clientid_t));
1089
1090 DECODE_TAIL;
1091 }
1092
1093 static __be32
1094 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1095 struct nfsd4_secinfo *secinfo)
1096 {
1097 DECODE_HEAD;
1098
1099 READ_BUF(4);
1100 READ32(secinfo->si_namelen);
1101 READ_BUF(secinfo->si_namelen);
1102 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1103 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1104 if (status)
1105 return status;
1106 DECODE_TAIL;
1107 }
1108
1109 static __be32
1110 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1111 struct nfsd4_secinfo_no_name *sin)
1112 {
1113 DECODE_HEAD;
1114
1115 READ_BUF(4);
1116 READ32(sin->sin_style);
1117 DECODE_TAIL;
1118 }
1119
1120 static __be32
1121 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1122 {
1123 __be32 status;
1124
1125 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1126 if (status)
1127 return status;
1128 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1129 &setattr->sa_acl, &setattr->sa_label);
1130 }
1131
1132 static __be32
1133 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1134 {
1135 DECODE_HEAD;
1136
1137 if (argp->minorversion >= 1)
1138 return nfserr_notsupp;
1139
1140 READ_BUF(NFS4_VERIFIER_SIZE);
1141 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1142
1143 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1144 if (status)
1145 return nfserr_bad_xdr;
1146 READ_BUF(8);
1147 READ32(setclientid->se_callback_prog);
1148 READ32(setclientid->se_callback_netid_len);
1149
1150 READ_BUF(setclientid->se_callback_netid_len + 4);
1151 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1152 READ32(setclientid->se_callback_addr_len);
1153
1154 READ_BUF(setclientid->se_callback_addr_len + 4);
1155 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1156 READ32(setclientid->se_callback_ident);
1157
1158 DECODE_TAIL;
1159 }
1160
1161 static __be32
1162 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1163 {
1164 DECODE_HEAD;
1165
1166 if (argp->minorversion >= 1)
1167 return nfserr_notsupp;
1168
1169 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1170 COPYMEM(&scd_c->sc_clientid, 8);
1171 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1172
1173 DECODE_TAIL;
1174 }
1175
1176 /* Also used for NVERIFY */
1177 static __be32
1178 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1179 {
1180 DECODE_HEAD;
1181
1182 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1183 goto out;
1184
1185 /* For convenience's sake, we compare raw xdr'd attributes in
1186 * nfsd4_proc_verify */
1187
1188 READ_BUF(4);
1189 READ32(verify->ve_attrlen);
1190 READ_BUF(verify->ve_attrlen);
1191 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1192
1193 DECODE_TAIL;
1194 }
1195
1196 static __be32
1197 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1198 {
1199 int avail;
1200 int len;
1201 DECODE_HEAD;
1202
1203 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1204 if (status)
1205 return status;
1206 READ_BUF(16);
1207 READ64(write->wr_offset);
1208 READ32(write->wr_stable_how);
1209 if (write->wr_stable_how > 2)
1210 goto xdr_error;
1211 READ32(write->wr_buflen);
1212
1213 /* Sorry .. no magic macros for this.. *
1214 * READ_BUF(write->wr_buflen);
1215 * SAVEMEM(write->wr_buf, write->wr_buflen);
1216 */
1217 avail = (char*)argp->end - (char*)argp->p;
1218 if (avail + argp->pagelen < write->wr_buflen) {
1219 dprintk("NFSD: xdr error (%s:%d)\n",
1220 __FILE__, __LINE__);
1221 goto xdr_error;
1222 }
1223 write->wr_head.iov_base = p;
1224 write->wr_head.iov_len = avail;
1225 write->wr_pagelist = argp->pagelist;
1226
1227 len = XDR_QUADLEN(write->wr_buflen) << 2;
1228 if (len >= avail) {
1229 int pages;
1230
1231 len -= avail;
1232
1233 pages = len >> PAGE_SHIFT;
1234 argp->pagelist += pages;
1235 argp->pagelen -= pages * PAGE_SIZE;
1236 len -= pages * PAGE_SIZE;
1237
1238 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1239 argp->pagelist++;
1240 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1241 }
1242 argp->p += XDR_QUADLEN(len);
1243
1244 DECODE_TAIL;
1245 }
1246
1247 static __be32
1248 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1249 {
1250 DECODE_HEAD;
1251
1252 if (argp->minorversion >= 1)
1253 return nfserr_notsupp;
1254
1255 READ_BUF(12);
1256 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1257 READ32(rlockowner->rl_owner.len);
1258 READ_BUF(rlockowner->rl_owner.len);
1259 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1260
1261 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1262 return nfserr_inval;
1263 DECODE_TAIL;
1264 }
1265
1266 static __be32
1267 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1268 struct nfsd4_exchange_id *exid)
1269 {
1270 int dummy, tmp;
1271 DECODE_HEAD;
1272
1273 READ_BUF(NFS4_VERIFIER_SIZE);
1274 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1275
1276 status = nfsd4_decode_opaque(argp, &exid->clname);
1277 if (status)
1278 return nfserr_bad_xdr;
1279
1280 READ_BUF(4);
1281 READ32(exid->flags);
1282
1283 /* Ignore state_protect4_a */
1284 READ_BUF(4);
1285 READ32(exid->spa_how);
1286 switch (exid->spa_how) {
1287 case SP4_NONE:
1288 break;
1289 case SP4_MACH_CRED:
1290 /* spo_must_enforce */
1291 READ_BUF(4);
1292 READ32(dummy);
1293 READ_BUF(dummy * 4);
1294 p += dummy;
1295
1296 /* spo_must_allow */
1297 READ_BUF(4);
1298 READ32(dummy);
1299 READ_BUF(dummy * 4);
1300 p += dummy;
1301 break;
1302 case SP4_SSV:
1303 /* ssp_ops */
1304 READ_BUF(4);
1305 READ32(dummy);
1306 READ_BUF(dummy * 4);
1307 p += dummy;
1308
1309 READ_BUF(4);
1310 READ32(dummy);
1311 READ_BUF(dummy * 4);
1312 p += dummy;
1313
1314 /* ssp_hash_algs<> */
1315 READ_BUF(4);
1316 READ32(tmp);
1317 while (tmp--) {
1318 READ_BUF(4);
1319 READ32(dummy);
1320 READ_BUF(dummy);
1321 p += XDR_QUADLEN(dummy);
1322 }
1323
1324 /* ssp_encr_algs<> */
1325 READ_BUF(4);
1326 READ32(tmp);
1327 while (tmp--) {
1328 READ_BUF(4);
1329 READ32(dummy);
1330 READ_BUF(dummy);
1331 p += XDR_QUADLEN(dummy);
1332 }
1333
1334 /* ssp_window and ssp_num_gss_handles */
1335 READ_BUF(8);
1336 READ32(dummy);
1337 READ32(dummy);
1338 break;
1339 default:
1340 goto xdr_error;
1341 }
1342
1343 /* Ignore Implementation ID */
1344 READ_BUF(4); /* nfs_impl_id4 array length */
1345 READ32(dummy);
1346
1347 if (dummy > 1)
1348 goto xdr_error;
1349
1350 if (dummy == 1) {
1351 /* nii_domain */
1352 READ_BUF(4);
1353 READ32(dummy);
1354 READ_BUF(dummy);
1355 p += XDR_QUADLEN(dummy);
1356
1357 /* nii_name */
1358 READ_BUF(4);
1359 READ32(dummy);
1360 READ_BUF(dummy);
1361 p += XDR_QUADLEN(dummy);
1362
1363 /* nii_date */
1364 READ_BUF(12);
1365 p += 3;
1366 }
1367 DECODE_TAIL;
1368 }
1369
1370 static __be32
1371 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1372 struct nfsd4_create_session *sess)
1373 {
1374 DECODE_HEAD;
1375 u32 dummy;
1376
1377 READ_BUF(16);
1378 COPYMEM(&sess->clientid, 8);
1379 READ32(sess->seqid);
1380 READ32(sess->flags);
1381
1382 /* Fore channel attrs */
1383 READ_BUF(28);
1384 READ32(dummy); /* headerpadsz is always 0 */
1385 READ32(sess->fore_channel.maxreq_sz);
1386 READ32(sess->fore_channel.maxresp_sz);
1387 READ32(sess->fore_channel.maxresp_cached);
1388 READ32(sess->fore_channel.maxops);
1389 READ32(sess->fore_channel.maxreqs);
1390 READ32(sess->fore_channel.nr_rdma_attrs);
1391 if (sess->fore_channel.nr_rdma_attrs == 1) {
1392 READ_BUF(4);
1393 READ32(sess->fore_channel.rdma_attrs);
1394 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1395 dprintk("Too many fore channel attr bitmaps!\n");
1396 goto xdr_error;
1397 }
1398
1399 /* Back channel attrs */
1400 READ_BUF(28);
1401 READ32(dummy); /* headerpadsz is always 0 */
1402 READ32(sess->back_channel.maxreq_sz);
1403 READ32(sess->back_channel.maxresp_sz);
1404 READ32(sess->back_channel.maxresp_cached);
1405 READ32(sess->back_channel.maxops);
1406 READ32(sess->back_channel.maxreqs);
1407 READ32(sess->back_channel.nr_rdma_attrs);
1408 if (sess->back_channel.nr_rdma_attrs == 1) {
1409 READ_BUF(4);
1410 READ32(sess->back_channel.rdma_attrs);
1411 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1412 dprintk("Too many back channel attr bitmaps!\n");
1413 goto xdr_error;
1414 }
1415
1416 READ_BUF(4);
1417 READ32(sess->callback_prog);
1418 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1419 DECODE_TAIL;
1420 }
1421
1422 static __be32
1423 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1424 struct nfsd4_destroy_session *destroy_session)
1425 {
1426 DECODE_HEAD;
1427 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1428 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1429
1430 DECODE_TAIL;
1431 }
1432
1433 static __be32
1434 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1435 struct nfsd4_free_stateid *free_stateid)
1436 {
1437 DECODE_HEAD;
1438
1439 READ_BUF(sizeof(stateid_t));
1440 READ32(free_stateid->fr_stateid.si_generation);
1441 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1442
1443 DECODE_TAIL;
1444 }
1445
1446 static __be32
1447 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1448 struct nfsd4_sequence *seq)
1449 {
1450 DECODE_HEAD;
1451
1452 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1453 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1454 READ32(seq->seqid);
1455 READ32(seq->slotid);
1456 READ32(seq->maxslots);
1457 READ32(seq->cachethis);
1458
1459 DECODE_TAIL;
1460 }
1461
1462 static __be32
1463 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1464 {
1465 int i;
1466 __be32 *p, status;
1467 struct nfsd4_test_stateid_id *stateid;
1468
1469 READ_BUF(4);
1470 test_stateid->ts_num_ids = ntohl(*p++);
1471
1472 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1473
1474 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1475 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1476 if (!stateid) {
1477 status = nfserrno(-ENOMEM);
1478 goto out;
1479 }
1480
1481 defer_free(argp, kfree, stateid);
1482 INIT_LIST_HEAD(&stateid->ts_id_list);
1483 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1484
1485 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1486 if (status)
1487 goto out;
1488 }
1489
1490 status = 0;
1491 out:
1492 return status;
1493 xdr_error:
1494 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1495 status = nfserr_bad_xdr;
1496 goto out;
1497 }
1498
1499 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1500 {
1501 DECODE_HEAD;
1502
1503 READ_BUF(8);
1504 COPYMEM(&dc->clientid, 8);
1505
1506 DECODE_TAIL;
1507 }
1508
1509 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1510 {
1511 DECODE_HEAD;
1512
1513 READ_BUF(4);
1514 READ32(rc->rca_one_fs);
1515
1516 DECODE_TAIL;
1517 }
1518
1519 static __be32
1520 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1521 {
1522 return nfs_ok;
1523 }
1524
1525 static __be32
1526 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1527 {
1528 return nfserr_notsupp;
1529 }
1530
1531 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1532
1533 static nfsd4_dec nfsd4_dec_ops[] = {
1534 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1535 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1536 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1537 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1538 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1539 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1540 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1541 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1542 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1543 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1544 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1545 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1546 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1547 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1548 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1549 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1550 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1551 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1552 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1553 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1554 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1555 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1556 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1557 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1558 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1559 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1560 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1561 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1562 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1563 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1564 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1565 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1566 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1567 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1568 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1569 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1570 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1571
1572 /* new operations for NFSv4.1 */
1573 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1574 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1575 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1576 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1577 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1578 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1579 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1580 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1581 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1582 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1583 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1584 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1585 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1586 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1587 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1588 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1589 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1590 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1591 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1592 };
1593
1594 static inline bool
1595 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1596 {
1597 if (op->opnum < FIRST_NFS4_OP)
1598 return false;
1599 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1600 return false;
1601 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1602 return false;
1603 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1604 return false;
1605 return true;
1606 }
1607
1608 /*
1609 * Return a rough estimate of the maximum possible reply size. Note the
1610 * estimate includes rpc headers so is meant to be passed to
1611 * svc_reserve, not svc_reserve_auth.
1612 *
1613 * Also note the current compound encoding permits only one operation to
1614 * use pages beyond the first one, so the maximum possible length is the
1615 * maximum over these values, not the sum.
1616 */
1617 static int nfsd4_max_reply(u32 opnum)
1618 {
1619 switch (opnum) {
1620 case OP_READLINK:
1621 case OP_READDIR:
1622 /*
1623 * Both of these ops take a single page for data and put
1624 * the head and tail in another page:
1625 */
1626 return 2 * PAGE_SIZE;
1627 case OP_READ:
1628 return INT_MAX;
1629 default:
1630 return PAGE_SIZE;
1631 }
1632 }
1633
1634 static __be32
1635 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1636 {
1637 DECODE_HEAD;
1638 struct nfsd4_op *op;
1639 bool cachethis = false;
1640 int max_reply = PAGE_SIZE;
1641 int i;
1642
1643 READ_BUF(4);
1644 READ32(argp->taglen);
1645 READ_BUF(argp->taglen + 8);
1646 SAVEMEM(argp->tag, argp->taglen);
1647 READ32(argp->minorversion);
1648 READ32(argp->opcnt);
1649
1650 if (argp->taglen > NFSD4_MAX_TAGLEN)
1651 goto xdr_error;
1652 if (argp->opcnt > 100)
1653 goto xdr_error;
1654
1655 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1656 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1657 if (!argp->ops) {
1658 argp->ops = argp->iops;
1659 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1660 goto xdr_error;
1661 }
1662 }
1663
1664 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1665 argp->opcnt = 0;
1666
1667 for (i = 0; i < argp->opcnt; i++) {
1668 op = &argp->ops[i];
1669 op->replay = NULL;
1670
1671 READ_BUF(4);
1672 READ32(op->opnum);
1673
1674 if (nfsd4_opnum_in_range(argp, op))
1675 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1676 else {
1677 op->opnum = OP_ILLEGAL;
1678 op->status = nfserr_op_illegal;
1679 }
1680 /*
1681 * We'll try to cache the result in the DRC if any one
1682 * op in the compound wants to be cached:
1683 */
1684 cachethis |= nfsd4_cache_this_op(op);
1685
1686 max_reply = max(max_reply, nfsd4_max_reply(op->opnum));
1687
1688 if (op->status) {
1689 argp->opcnt = i+1;
1690 break;
1691 }
1692 }
1693 /* Sessions make the DRC unnecessary: */
1694 if (argp->minorversion)
1695 cachethis = false;
1696 if (max_reply != INT_MAX)
1697 svc_reserve(argp->rqstp, max_reply);
1698 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1699
1700 DECODE_TAIL;
1701 }
1702
1703 #define WRITE32(n) *p++ = htonl(n)
1704 #define WRITE64(n) do { \
1705 *p++ = htonl((u32)((n) >> 32)); \
1706 *p++ = htonl((u32)(n)); \
1707 } while (0)
1708 #define WRITEMEM(ptr,nbytes) do { if (nbytes > 0) { \
1709 *(p + XDR_QUADLEN(nbytes) -1) = 0; \
1710 memcpy(p, ptr, nbytes); \
1711 p += XDR_QUADLEN(nbytes); \
1712 }} while (0)
1713
1714 static void write32(__be32 **p, u32 n)
1715 {
1716 *(*p)++ = htonl(n);
1717 }
1718
1719 static void write64(__be32 **p, u64 n)
1720 {
1721 write32(p, (n >> 32));
1722 write32(p, (u32)n);
1723 }
1724
1725 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1726 {
1727 if (IS_I_VERSION(inode)) {
1728 write64(p, inode->i_version);
1729 } else {
1730 write32(p, stat->ctime.tv_sec);
1731 write32(p, stat->ctime.tv_nsec);
1732 }
1733 }
1734
1735 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1736 {
1737 write32(p, c->atomic);
1738 if (c->change_supported) {
1739 write64(p, c->before_change);
1740 write64(p, c->after_change);
1741 } else {
1742 write32(p, c->before_ctime_sec);
1743 write32(p, c->before_ctime_nsec);
1744 write32(p, c->after_ctime_sec);
1745 write32(p, c->after_ctime_nsec);
1746 }
1747 }
1748
1749 /* Encode as an array of strings the string given with components
1750 * separated @sep, escaped with esc_enter and esc_exit.
1751 */
1752 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1753 char *components, char esc_enter,
1754 char esc_exit)
1755 {
1756 __be32 *p;
1757 __be32 pathlen;
1758 int pathlen_offset;
1759 int strlen, count=0;
1760 char *str, *end, *next;
1761
1762 dprintk("nfsd4_encode_components(%s)\n", components);
1763
1764 pathlen_offset = xdr->buf->len;
1765 p = xdr_reserve_space(xdr, 4);
1766 if (!p)
1767 return nfserr_resource;
1768 p++; /* We will fill this in with @count later */
1769
1770 end = str = components;
1771 while (*end) {
1772 bool found_esc = false;
1773
1774 /* try to parse as esc_start, ..., esc_end, sep */
1775 if (*str == esc_enter) {
1776 for (; *end && (*end != esc_exit); end++)
1777 /* find esc_exit or end of string */;
1778 next = end + 1;
1779 if (*end && (!*next || *next == sep)) {
1780 str++;
1781 found_esc = true;
1782 }
1783 }
1784
1785 if (!found_esc)
1786 for (; *end && (*end != sep); end++)
1787 /* find sep or end of string */;
1788
1789 strlen = end - str;
1790 if (strlen) {
1791 p = xdr_reserve_space(xdr, strlen + 4);
1792 if (!p)
1793 return nfserr_resource;
1794 WRITE32(strlen);
1795 WRITEMEM(str, strlen);
1796 count++;
1797 }
1798 else
1799 end++;
1800 str = end;
1801 }
1802 pathlen = htonl(xdr->buf->len - pathlen_offset);
1803 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1804 return 0;
1805 }
1806
1807 /* Encode as an array of strings the string given with components
1808 * separated @sep.
1809 */
1810 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1811 char *components)
1812 {
1813 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1814 }
1815
1816 /*
1817 * encode a location element of a fs_locations structure
1818 */
1819 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1820 struct nfsd4_fs_location *location)
1821 {
1822 __be32 status;
1823
1824 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1825 '[', ']');
1826 if (status)
1827 return status;
1828 status = nfsd4_encode_components(xdr, '/', location->path);
1829 if (status)
1830 return status;
1831 return 0;
1832 }
1833
1834 /*
1835 * Encode a path in RFC3530 'pathname4' format
1836 */
1837 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
1838 const struct path *root,
1839 const struct path *path)
1840 {
1841 struct path cur = *path;
1842 __be32 *p;
1843 struct dentry **components = NULL;
1844 unsigned int ncomponents = 0;
1845 __be32 err = nfserr_jukebox;
1846
1847 dprintk("nfsd4_encode_components(");
1848
1849 path_get(&cur);
1850 /* First walk the path up to the nfsd root, and store the
1851 * dentries/path components in an array.
1852 */
1853 for (;;) {
1854 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1855 break;
1856 if (cur.dentry == cur.mnt->mnt_root) {
1857 if (follow_up(&cur))
1858 continue;
1859 goto out_free;
1860 }
1861 if ((ncomponents & 15) == 0) {
1862 struct dentry **new;
1863 new = krealloc(components,
1864 sizeof(*new) * (ncomponents + 16),
1865 GFP_KERNEL);
1866 if (!new)
1867 goto out_free;
1868 components = new;
1869 }
1870 components[ncomponents++] = cur.dentry;
1871 cur.dentry = dget_parent(cur.dentry);
1872 }
1873 err = nfserr_resource;
1874 p = xdr_reserve_space(xdr, 4);
1875 if (!p)
1876 goto out_free;
1877 WRITE32(ncomponents);
1878
1879 while (ncomponents) {
1880 struct dentry *dentry = components[ncomponents - 1];
1881 unsigned int len;
1882
1883 spin_lock(&dentry->d_lock);
1884 len = dentry->d_name.len;
1885 p = xdr_reserve_space(xdr, len + 4);
1886 if (!p) {
1887 spin_unlock(&dentry->d_lock);
1888 goto out_free;
1889 }
1890 WRITE32(len);
1891 WRITEMEM(dentry->d_name.name, len);
1892 dprintk("/%s", dentry->d_name.name);
1893 spin_unlock(&dentry->d_lock);
1894 dput(dentry);
1895 ncomponents--;
1896 }
1897
1898 err = 0;
1899 out_free:
1900 dprintk(")\n");
1901 while (ncomponents)
1902 dput(components[--ncomponents]);
1903 kfree(components);
1904 path_put(&cur);
1905 return err;
1906 }
1907
1908 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
1909 struct svc_rqst *rqstp, const struct path *path)
1910 {
1911 struct svc_export *exp_ps;
1912 __be32 res;
1913
1914 exp_ps = rqst_find_fsidzero_export(rqstp);
1915 if (IS_ERR(exp_ps))
1916 return nfserrno(PTR_ERR(exp_ps));
1917 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
1918 exp_put(exp_ps);
1919 return res;
1920 }
1921
1922 /*
1923 * encode a fs_locations structure
1924 */
1925 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
1926 struct svc_rqst *rqstp, struct svc_export *exp)
1927 {
1928 __be32 status;
1929 int i;
1930 __be32 *p;
1931 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1932
1933 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1934 if (status)
1935 return status;
1936 p = xdr_reserve_space(xdr, 4);
1937 if (!p)
1938 return nfserr_resource;
1939 WRITE32(fslocs->locations_count);
1940 for (i=0; i<fslocs->locations_count; i++) {
1941 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1942 if (status)
1943 return status;
1944 }
1945 return 0;
1946 }
1947
1948 static u32 nfs4_file_type(umode_t mode)
1949 {
1950 switch (mode & S_IFMT) {
1951 case S_IFIFO: return NF4FIFO;
1952 case S_IFCHR: return NF4CHR;
1953 case S_IFDIR: return NF4DIR;
1954 case S_IFBLK: return NF4BLK;
1955 case S_IFLNK: return NF4LNK;
1956 case S_IFREG: return NF4REG;
1957 case S_IFSOCK: return NF4SOCK;
1958 default: return NF4BAD;
1959 };
1960 }
1961
1962 static inline __be32
1963 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1964 struct nfs4_ace *ace)
1965 {
1966 if (ace->whotype != NFS4_ACL_WHO_NAMED)
1967 return nfs4_acl_write_who(xdr, ace->whotype);
1968 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1969 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1970 else
1971 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1972 }
1973
1974 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1975 FATTR4_WORD0_RDATTR_ERROR)
1976 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1977
1978 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1979 static inline __be32
1980 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1981 void *context, int len)
1982 {
1983 __be32 *p;
1984
1985 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
1986 if (!p)
1987 return nfserr_resource;
1988
1989 /*
1990 * For now we use a 0 here to indicate the null translation; in
1991 * the future we may place a call to translation code here.
1992 */
1993 WRITE32(0); /* lfs */
1994 WRITE32(0); /* pi */
1995 p = xdr_encode_opaque(p, context, len);
1996 return 0;
1997 }
1998 #else
1999 static inline __be32
2000 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2001 void *context, int len)
2002 { return 0; }
2003 #endif
2004
2005 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2006 {
2007 /* As per referral draft: */
2008 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2009 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2010 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2011 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2012 *rdattr_err = NFSERR_MOVED;
2013 else
2014 return nfserr_moved;
2015 }
2016 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2017 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2018 return 0;
2019 }
2020
2021
2022 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2023 {
2024 struct path path = exp->ex_path;
2025 int err;
2026
2027 path_get(&path);
2028 while (follow_up(&path)) {
2029 if (path.dentry != path.mnt->mnt_root)
2030 break;
2031 }
2032 err = vfs_getattr(&path, stat);
2033 path_put(&path);
2034 return err;
2035 }
2036
2037 /*
2038 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2039 * ourselves.
2040 */
2041 __be32
2042 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2043 struct svc_export *exp,
2044 struct dentry *dentry, u32 *bmval,
2045 struct svc_rqst *rqstp, int ignore_crossmnt)
2046 {
2047 u32 bmval0 = bmval[0];
2048 u32 bmval1 = bmval[1];
2049 u32 bmval2 = bmval[2];
2050 struct kstat stat;
2051 struct svc_fh *tempfh = NULL;
2052 struct kstatfs statfs;
2053 __be32 *p;
2054 int starting_len = xdr->buf->len;
2055 int attrlen_offset;
2056 __be32 attrlen;
2057 u32 dummy;
2058 u64 dummy64;
2059 u32 rdattr_err = 0;
2060 __be32 status;
2061 int err;
2062 int aclsupport = 0;
2063 struct nfs4_acl *acl = NULL;
2064 void *context = NULL;
2065 int contextlen;
2066 bool contextsupport = false;
2067 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2068 u32 minorversion = resp->cstate.minorversion;
2069 struct path path = {
2070 .mnt = exp->ex_path.mnt,
2071 .dentry = dentry,
2072 };
2073 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2074
2075 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2076 BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2077 BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2078 BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2079
2080 if (exp->ex_fslocs.migrated) {
2081 BUG_ON(bmval[2]);
2082 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2083 if (status)
2084 goto out;
2085 }
2086
2087 err = vfs_getattr(&path, &stat);
2088 if (err)
2089 goto out_nfserr;
2090 if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2091 FATTR4_WORD0_MAXNAME)) ||
2092 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2093 FATTR4_WORD1_SPACE_TOTAL))) {
2094 err = vfs_statfs(&path, &statfs);
2095 if (err)
2096 goto out_nfserr;
2097 }
2098 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2099 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2100 status = nfserr_jukebox;
2101 if (!tempfh)
2102 goto out;
2103 fh_init(tempfh, NFS4_FHSIZE);
2104 status = fh_compose(tempfh, exp, dentry, NULL);
2105 if (status)
2106 goto out;
2107 fhp = tempfh;
2108 }
2109 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2110 | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2111 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2112 aclsupport = (err == 0);
2113 if (bmval0 & FATTR4_WORD0_ACL) {
2114 if (err == -EOPNOTSUPP)
2115 bmval0 &= ~FATTR4_WORD0_ACL;
2116 else if (err == -EINVAL) {
2117 status = nfserr_attrnotsupp;
2118 goto out;
2119 } else if (err != 0)
2120 goto out_nfserr;
2121 }
2122 }
2123
2124 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2125 if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2126 bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2127 err = security_inode_getsecctx(dentry->d_inode,
2128 &context, &contextlen);
2129 contextsupport = (err == 0);
2130 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2131 if (err == -EOPNOTSUPP)
2132 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2133 else if (err)
2134 goto out_nfserr;
2135 }
2136 }
2137 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2138
2139 if (bmval2) {
2140 p = xdr_reserve_space(xdr, 16);
2141 if (!p)
2142 goto out_resource;
2143 WRITE32(3);
2144 WRITE32(bmval0);
2145 WRITE32(bmval1);
2146 WRITE32(bmval2);
2147 } else if (bmval1) {
2148 p = xdr_reserve_space(xdr, 12);
2149 if (!p)
2150 goto out_resource;
2151 WRITE32(2);
2152 WRITE32(bmval0);
2153 WRITE32(bmval1);
2154 } else {
2155 p = xdr_reserve_space(xdr, 8);
2156 if (!p)
2157 goto out_resource;
2158 WRITE32(1);
2159 WRITE32(bmval0);
2160 }
2161
2162 attrlen_offset = xdr->buf->len;
2163 p = xdr_reserve_space(xdr, 4);
2164 if (!p)
2165 goto out_resource;
2166 p++; /* to be backfilled later */
2167
2168 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2169 u32 word0 = nfsd_suppattrs0(minorversion);
2170 u32 word1 = nfsd_suppattrs1(minorversion);
2171 u32 word2 = nfsd_suppattrs2(minorversion);
2172
2173 if (!aclsupport)
2174 word0 &= ~FATTR4_WORD0_ACL;
2175 if (!contextsupport)
2176 word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2177 if (!word2) {
2178 p = xdr_reserve_space(xdr, 12);
2179 if (!p)
2180 goto out_resource;
2181 WRITE32(2);
2182 WRITE32(word0);
2183 WRITE32(word1);
2184 } else {
2185 p = xdr_reserve_space(xdr, 16);
2186 if (!p)
2187 goto out_resource;
2188 WRITE32(3);
2189 WRITE32(word0);
2190 WRITE32(word1);
2191 WRITE32(word2);
2192 }
2193 }
2194 if (bmval0 & FATTR4_WORD0_TYPE) {
2195 p = xdr_reserve_space(xdr, 4);
2196 if (!p)
2197 goto out_resource;
2198 dummy = nfs4_file_type(stat.mode);
2199 if (dummy == NF4BAD) {
2200 status = nfserr_serverfault;
2201 goto out;
2202 }
2203 WRITE32(dummy);
2204 }
2205 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2206 p = xdr_reserve_space(xdr, 4);
2207 if (!p)
2208 goto out_resource;
2209 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2210 WRITE32(NFS4_FH_PERSISTENT);
2211 else
2212 WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2213 }
2214 if (bmval0 & FATTR4_WORD0_CHANGE) {
2215 p = xdr_reserve_space(xdr, 8);
2216 if (!p)
2217 goto out_resource;
2218 write_change(&p, &stat, dentry->d_inode);
2219 }
2220 if (bmval0 & FATTR4_WORD0_SIZE) {
2221 p = xdr_reserve_space(xdr, 8);
2222 if (!p)
2223 goto out_resource;
2224 WRITE64(stat.size);
2225 }
2226 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2227 p = xdr_reserve_space(xdr, 4);
2228 if (!p)
2229 goto out_resource;
2230 WRITE32(1);
2231 }
2232 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2233 p = xdr_reserve_space(xdr, 4);
2234 if (!p)
2235 goto out_resource;
2236 WRITE32(1);
2237 }
2238 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2239 p = xdr_reserve_space(xdr, 4);
2240 if (!p)
2241 goto out_resource;
2242 WRITE32(0);
2243 }
2244 if (bmval0 & FATTR4_WORD0_FSID) {
2245 p = xdr_reserve_space(xdr, 16);
2246 if (!p)
2247 goto out_resource;
2248 if (exp->ex_fslocs.migrated) {
2249 WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2250 WRITE64(NFS4_REFERRAL_FSID_MINOR);
2251 } else switch(fsid_source(fhp)) {
2252 case FSIDSOURCE_FSID:
2253 WRITE64((u64)exp->ex_fsid);
2254 WRITE64((u64)0);
2255 break;
2256 case FSIDSOURCE_DEV:
2257 WRITE32(0);
2258 WRITE32(MAJOR(stat.dev));
2259 WRITE32(0);
2260 WRITE32(MINOR(stat.dev));
2261 break;
2262 case FSIDSOURCE_UUID:
2263 WRITEMEM(exp->ex_uuid, 16);
2264 break;
2265 }
2266 }
2267 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2268 p = xdr_reserve_space(xdr, 4);
2269 if (!p)
2270 goto out_resource;
2271 WRITE32(0);
2272 }
2273 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2274 p = xdr_reserve_space(xdr, 4);
2275 if (!p)
2276 goto out_resource;
2277 WRITE32(nn->nfsd4_lease);
2278 }
2279 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2280 p = xdr_reserve_space(xdr, 4);
2281 if (!p)
2282 goto out_resource;
2283 WRITE32(rdattr_err);
2284 }
2285 if (bmval0 & FATTR4_WORD0_ACL) {
2286 struct nfs4_ace *ace;
2287
2288 if (acl == NULL) {
2289 p = xdr_reserve_space(xdr, 4);
2290 if (!p)
2291 goto out_resource;
2292
2293 WRITE32(0);
2294 goto out_acl;
2295 }
2296 p = xdr_reserve_space(xdr, 4);
2297 if (!p)
2298 goto out_resource;
2299 WRITE32(acl->naces);
2300
2301 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2302 p = xdr_reserve_space(xdr, 4*3);
2303 if (!p)
2304 goto out_resource;
2305 WRITE32(ace->type);
2306 WRITE32(ace->flag);
2307 WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2308 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2309 if (status)
2310 goto out;
2311 }
2312 }
2313 out_acl:
2314 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2315 p = xdr_reserve_space(xdr, 4);
2316 if (!p)
2317 goto out_resource;
2318 WRITE32(aclsupport ?
2319 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2320 }
2321 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2322 p = xdr_reserve_space(xdr, 4);
2323 if (!p)
2324 goto out_resource;
2325 WRITE32(1);
2326 }
2327 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2328 p = xdr_reserve_space(xdr, 4);
2329 if (!p)
2330 goto out_resource;
2331 WRITE32(0);
2332 }
2333 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2334 p = xdr_reserve_space(xdr, 4);
2335 if (!p)
2336 goto out_resource;
2337 WRITE32(1);
2338 }
2339 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2340 p = xdr_reserve_space(xdr, 4);
2341 if (!p)
2342 goto out_resource;
2343 WRITE32(1);
2344 }
2345 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2346 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2347 if (!p)
2348 goto out_resource;
2349 WRITE32(fhp->fh_handle.fh_size);
2350 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2351 }
2352 if (bmval0 & FATTR4_WORD0_FILEID) {
2353 p = xdr_reserve_space(xdr, 8);
2354 if (!p)
2355 goto out_resource;
2356 WRITE64(stat.ino);
2357 }
2358 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2359 p = xdr_reserve_space(xdr, 8);
2360 if (!p)
2361 goto out_resource;
2362 WRITE64((u64) statfs.f_ffree);
2363 }
2364 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2365 p = xdr_reserve_space(xdr, 8);
2366 if (!p)
2367 goto out_resource;
2368 WRITE64((u64) statfs.f_ffree);
2369 }
2370 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2371 p = xdr_reserve_space(xdr, 8);
2372 if (!p)
2373 goto out_resource;
2374 WRITE64((u64) statfs.f_files);
2375 }
2376 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2377 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2378 if (status)
2379 goto out;
2380 }
2381 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2382 p = xdr_reserve_space(xdr, 4);
2383 if (!p)
2384 goto out_resource;
2385 WRITE32(1);
2386 }
2387 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2388 p = xdr_reserve_space(xdr, 8);
2389 if (!p)
2390 goto out_resource;
2391 WRITE64(exp->ex_path.mnt->mnt_sb->s_maxbytes);
2392 }
2393 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2394 p = xdr_reserve_space(xdr, 4);
2395 if (!p)
2396 goto out_resource;
2397 WRITE32(255);
2398 }
2399 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2400 p = xdr_reserve_space(xdr, 4);
2401 if (!p)
2402 goto out_resource;
2403 WRITE32(statfs.f_namelen);
2404 }
2405 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2406 p = xdr_reserve_space(xdr, 8);
2407 if (!p)
2408 goto out_resource;
2409 WRITE64((u64) svc_max_payload(rqstp));
2410 }
2411 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2412 p = xdr_reserve_space(xdr, 8);
2413 if (!p)
2414 goto out_resource;
2415 WRITE64((u64) svc_max_payload(rqstp));
2416 }
2417 if (bmval1 & FATTR4_WORD1_MODE) {
2418 p = xdr_reserve_space(xdr, 4);
2419 if (!p)
2420 goto out_resource;
2421 WRITE32(stat.mode & S_IALLUGO);
2422 }
2423 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2424 p = xdr_reserve_space(xdr, 4);
2425 if (!p)
2426 goto out_resource;
2427 WRITE32(1);
2428 }
2429 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2430 p = xdr_reserve_space(xdr, 4);
2431 if (!p)
2432 goto out_resource;
2433 WRITE32(stat.nlink);
2434 }
2435 if (bmval1 & FATTR4_WORD1_OWNER) {
2436 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2437 if (status)
2438 goto out;
2439 }
2440 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2441 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2442 if (status)
2443 goto out;
2444 }
2445 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2446 p = xdr_reserve_space(xdr, 8);
2447 if (!p)
2448 goto out_resource;
2449 WRITE32((u32) MAJOR(stat.rdev));
2450 WRITE32((u32) MINOR(stat.rdev));
2451 }
2452 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2453 p = xdr_reserve_space(xdr, 8);
2454 if (!p)
2455 goto out_resource;
2456 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2457 WRITE64(dummy64);
2458 }
2459 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2460 p = xdr_reserve_space(xdr, 8);
2461 if (!p)
2462 goto out_resource;
2463 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2464 WRITE64(dummy64);
2465 }
2466 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2467 p = xdr_reserve_space(xdr, 8);
2468 if (!p)
2469 goto out_resource;
2470 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2471 WRITE64(dummy64);
2472 }
2473 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2474 p = xdr_reserve_space(xdr, 8);
2475 if (!p)
2476 goto out_resource;
2477 dummy64 = (u64)stat.blocks << 9;
2478 WRITE64(dummy64);
2479 }
2480 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2481 p = xdr_reserve_space(xdr, 12);
2482 if (!p)
2483 goto out_resource;
2484 WRITE64((s64)stat.atime.tv_sec);
2485 WRITE32(stat.atime.tv_nsec);
2486 }
2487 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2488 p = xdr_reserve_space(xdr, 12);
2489 if (!p)
2490 goto out_resource;
2491 WRITE32(0);
2492 WRITE32(1);
2493 WRITE32(0);
2494 }
2495 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2496 p = xdr_reserve_space(xdr, 12);
2497 if (!p)
2498 goto out_resource;
2499 WRITE64((s64)stat.ctime.tv_sec);
2500 WRITE32(stat.ctime.tv_nsec);
2501 }
2502 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2503 p = xdr_reserve_space(xdr, 12);
2504 if (!p)
2505 goto out_resource;
2506 WRITE64((s64)stat.mtime.tv_sec);
2507 WRITE32(stat.mtime.tv_nsec);
2508 }
2509 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2510 p = xdr_reserve_space(xdr, 8);
2511 if (!p)
2512 goto out_resource;
2513 /*
2514 * Get parent's attributes if not ignoring crossmount
2515 * and this is the root of a cross-mounted filesystem.
2516 */
2517 if (ignore_crossmnt == 0 &&
2518 dentry == exp->ex_path.mnt->mnt_root)
2519 get_parent_attributes(exp, &stat);
2520 WRITE64(stat.ino);
2521 }
2522 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2523 status = nfsd4_encode_security_label(xdr, rqstp, context,
2524 contextlen);
2525 if (status)
2526 goto out;
2527 }
2528 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2529 p = xdr_reserve_space(xdr, 16);
2530 if (!p)
2531 goto out_resource;
2532 WRITE32(3);
2533 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2534 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2535 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2536 }
2537
2538 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2539 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2540 status = nfs_ok;
2541
2542 out:
2543 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2544 if (context)
2545 security_release_secctx(context, contextlen);
2546 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2547 kfree(acl);
2548 if (tempfh) {
2549 fh_put(tempfh);
2550 kfree(tempfh);
2551 }
2552 if (status)
2553 xdr_truncate_encode(xdr, starting_len);
2554 return status;
2555 out_nfserr:
2556 status = nfserrno(err);
2557 goto out;
2558 out_resource:
2559 status = nfserr_resource;
2560 goto out;
2561 }
2562
2563 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2564 struct svc_fh *fhp, struct svc_export *exp,
2565 struct dentry *dentry, u32 *bmval,
2566 struct svc_rqst *rqstp, int ignore_crossmnt)
2567 {
2568 struct xdr_buf dummy = {
2569 .head[0] = {
2570 .iov_base = *p,
2571 },
2572 .buflen = words << 2,
2573 };
2574 struct xdr_stream xdr;
2575 __be32 ret;
2576
2577 xdr_init_encode(&xdr, &dummy, NULL);
2578 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2579 ignore_crossmnt);
2580 *p = xdr.p;
2581 return ret;
2582 }
2583
2584 static inline int attributes_need_mount(u32 *bmval)
2585 {
2586 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2587 return 1;
2588 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2589 return 1;
2590 return 0;
2591 }
2592
2593 static __be32
2594 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2595 const char *name, int namlen, __be32 **p, int buflen)
2596 {
2597 struct svc_export *exp = cd->rd_fhp->fh_export;
2598 struct dentry *dentry;
2599 __be32 nfserr;
2600 int ignore_crossmnt = 0;
2601
2602 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2603 if (IS_ERR(dentry))
2604 return nfserrno(PTR_ERR(dentry));
2605 if (!dentry->d_inode) {
2606 /*
2607 * nfsd_buffered_readdir drops the i_mutex between
2608 * readdir and calling this callback, leaving a window
2609 * where this directory entry could have gone away.
2610 */
2611 dput(dentry);
2612 return nfserr_noent;
2613 }
2614
2615 exp_get(exp);
2616 /*
2617 * In the case of a mountpoint, the client may be asking for
2618 * attributes that are only properties of the underlying filesystem
2619 * as opposed to the cross-mounted file system. In such a case,
2620 * we will not follow the cross mount and will fill the attribtutes
2621 * directly from the mountpoint dentry.
2622 */
2623 if (nfsd_mountpoint(dentry, exp)) {
2624 int err;
2625
2626 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2627 && !attributes_need_mount(cd->rd_bmval)) {
2628 ignore_crossmnt = 1;
2629 goto out_encode;
2630 }
2631 /*
2632 * Why the heck aren't we just using nfsd_lookup??
2633 * Different "."/".." handling? Something else?
2634 * At least, add a comment here to explain....
2635 */
2636 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2637 if (err) {
2638 nfserr = nfserrno(err);
2639 goto out_put;
2640 }
2641 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2642 if (nfserr)
2643 goto out_put;
2644
2645 }
2646 out_encode:
2647 nfserr = nfsd4_encode_fattr_to_buf(p, buflen, NULL, exp, dentry,
2648 cd->rd_bmval,
2649 cd->rd_rqstp, ignore_crossmnt);
2650 out_put:
2651 dput(dentry);
2652 exp_put(exp);
2653 return nfserr;
2654 }
2655
2656 static __be32 *
2657 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2658 {
2659 if (buflen < 6)
2660 return NULL;
2661 *p++ = htonl(2);
2662 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2663 *p++ = htonl(0); /* bmval1 */
2664
2665 *p++ = htonl(4); /* attribute length */
2666 *p++ = nfserr; /* no htonl */
2667 return p;
2668 }
2669
2670 static int
2671 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2672 loff_t offset, u64 ino, unsigned int d_type)
2673 {
2674 struct readdir_cd *ccd = ccdv;
2675 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2676 int buflen;
2677 __be32 *p = cd->buffer;
2678 __be32 *cookiep;
2679 __be32 nfserr = nfserr_toosmall;
2680
2681 /* In nfsv4, "." and ".." never make it onto the wire.. */
2682 if (name && isdotent(name, namlen)) {
2683 cd->common.err = nfs_ok;
2684 return 0;
2685 }
2686
2687 if (cd->offset)
2688 xdr_encode_hyper(cd->offset, (u64) offset);
2689
2690 buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2691 if (buflen < 0)
2692 goto fail;
2693
2694 *p++ = xdr_one; /* mark entry present */
2695 cookiep = p;
2696 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
2697 p = xdr_encode_array(p, name, namlen); /* name length & name */
2698
2699 nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, &p, buflen);
2700 switch (nfserr) {
2701 case nfs_ok:
2702 break;
2703 case nfserr_resource:
2704 nfserr = nfserr_toosmall;
2705 goto fail;
2706 case nfserr_noent:
2707 goto skip_entry;
2708 default:
2709 /*
2710 * If the client requested the RDATTR_ERROR attribute,
2711 * we stuff the error code into this attribute
2712 * and continue. If this attribute was not requested,
2713 * then in accordance with the spec, we fail the
2714 * entire READDIR operation(!)
2715 */
2716 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2717 goto fail;
2718 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2719 if (p == NULL) {
2720 nfserr = nfserr_toosmall;
2721 goto fail;
2722 }
2723 }
2724 cd->buflen -= (p - cd->buffer);
2725 cd->buffer = p;
2726 cd->offset = cookiep;
2727 skip_entry:
2728 cd->common.err = nfs_ok;
2729 return 0;
2730 fail:
2731 cd->common.err = nfserr;
2732 return -EINVAL;
2733 }
2734
2735 static __be32
2736 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2737 {
2738 __be32 *p;
2739
2740 p = xdr_reserve_space(xdr, sizeof(stateid_t));
2741 if (!p)
2742 return nfserr_resource;
2743 WRITE32(sid->si_generation);
2744 WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2745 return 0;
2746 }
2747
2748 static __be32
2749 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2750 {
2751 struct xdr_stream *xdr = &resp->xdr;
2752 __be32 *p;
2753
2754 if (!nfserr) {
2755 p = xdr_reserve_space(xdr, 8);
2756 if (!p)
2757 return nfserr_resource;
2758 WRITE32(access->ac_supported);
2759 WRITE32(access->ac_resp_access);
2760 }
2761 return nfserr;
2762 }
2763
2764 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2765 {
2766 struct xdr_stream *xdr = &resp->xdr;
2767 __be32 *p;
2768
2769 if (!nfserr) {
2770 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
2771 if (!p)
2772 return nfserr_resource;
2773 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2774 WRITE32(bcts->dir);
2775 /* Sorry, we do not yet support RDMA over 4.1: */
2776 WRITE32(0);
2777 }
2778 return nfserr;
2779 }
2780
2781 static __be32
2782 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2783 {
2784 struct xdr_stream *xdr = &resp->xdr;
2785
2786 if (!nfserr)
2787 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2788
2789 return nfserr;
2790 }
2791
2792
2793 static __be32
2794 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2795 {
2796 struct xdr_stream *xdr = &resp->xdr;
2797 __be32 *p;
2798
2799 if (!nfserr) {
2800 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
2801 if (!p)
2802 return nfserr_resource;
2803 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2804 }
2805 return nfserr;
2806 }
2807
2808 static __be32
2809 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2810 {
2811 struct xdr_stream *xdr = &resp->xdr;
2812 __be32 *p;
2813
2814 if (!nfserr) {
2815 p = xdr_reserve_space(xdr, 32);
2816 if (!p)
2817 return nfserr_resource;
2818 write_cinfo(&p, &create->cr_cinfo);
2819 WRITE32(2);
2820 WRITE32(create->cr_bmval[0]);
2821 WRITE32(create->cr_bmval[1]);
2822 }
2823 return nfserr;
2824 }
2825
2826 static __be32
2827 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2828 {
2829 struct svc_fh *fhp = getattr->ga_fhp;
2830 struct xdr_stream *xdr = &resp->xdr;
2831
2832 if (nfserr)
2833 return nfserr;
2834
2835 nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
2836 getattr->ga_bmval,
2837 resp->rqstp, 0);
2838 return nfserr;
2839 }
2840
2841 static __be32
2842 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2843 {
2844 struct xdr_stream *xdr = &resp->xdr;
2845 struct svc_fh *fhp = *fhpp;
2846 unsigned int len;
2847 __be32 *p;
2848
2849 if (!nfserr) {
2850 len = fhp->fh_handle.fh_size;
2851 p = xdr_reserve_space(xdr, len + 4);
2852 if (!p)
2853 return nfserr_resource;
2854 WRITE32(len);
2855 WRITEMEM(&fhp->fh_handle.fh_base, len);
2856 }
2857 return nfserr;
2858 }
2859
2860 /*
2861 * Including all fields other than the name, a LOCK4denied structure requires
2862 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2863 */
2864 static __be32
2865 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
2866 {
2867 struct xdr_netobj *conf = &ld->ld_owner;
2868 __be32 *p;
2869
2870 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2871 if (!p)
2872 return nfserr_resource;
2873 WRITE64(ld->ld_start);
2874 WRITE64(ld->ld_length);
2875 WRITE32(ld->ld_type);
2876 if (conf->len) {
2877 WRITEMEM(&ld->ld_clientid, 8);
2878 WRITE32(conf->len);
2879 WRITEMEM(conf->data, conf->len);
2880 kfree(conf->data);
2881 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
2882 WRITE64((u64)0); /* clientid */
2883 WRITE32(0); /* length of owner name */
2884 }
2885 return nfserr_denied;
2886 }
2887
2888 static __be32
2889 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2890 {
2891 struct xdr_stream *xdr = &resp->xdr;
2892
2893 if (!nfserr)
2894 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2895 else if (nfserr == nfserr_denied)
2896 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2897
2898 return nfserr;
2899 }
2900
2901 static __be32
2902 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2903 {
2904 struct xdr_stream *xdr = &resp->xdr;
2905
2906 if (nfserr == nfserr_denied)
2907 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2908 return nfserr;
2909 }
2910
2911 static __be32
2912 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2913 {
2914 struct xdr_stream *xdr = &resp->xdr;
2915
2916 if (!nfserr)
2917 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2918
2919 return nfserr;
2920 }
2921
2922
2923 static __be32
2924 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2925 {
2926 struct xdr_stream *xdr = &resp->xdr;
2927 __be32 *p;
2928
2929 if (!nfserr) {
2930 p = xdr_reserve_space(xdr, 20);
2931 if (!p)
2932 return nfserr_resource;
2933 write_cinfo(&p, &link->li_cinfo);
2934 }
2935 return nfserr;
2936 }
2937
2938
2939 static __be32
2940 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2941 {
2942 struct xdr_stream *xdr = &resp->xdr;
2943 __be32 *p;
2944
2945 if (nfserr)
2946 goto out;
2947
2948 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
2949 if (nfserr)
2950 goto out;
2951 p = xdr_reserve_space(xdr, 40);
2952 if (!p)
2953 return nfserr_resource;
2954 write_cinfo(&p, &open->op_cinfo);
2955 WRITE32(open->op_rflags);
2956 WRITE32(2);
2957 WRITE32(open->op_bmval[0]);
2958 WRITE32(open->op_bmval[1]);
2959 WRITE32(open->op_delegate_type);
2960
2961 switch (open->op_delegate_type) {
2962 case NFS4_OPEN_DELEGATE_NONE:
2963 break;
2964 case NFS4_OPEN_DELEGATE_READ:
2965 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
2966 if (nfserr)
2967 return nfserr;
2968 p = xdr_reserve_space(xdr, 20);
2969 if (!p)
2970 return nfserr_resource;
2971 WRITE32(open->op_recall);
2972
2973 /*
2974 * TODO: ACE's in delegations
2975 */
2976 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2977 WRITE32(0);
2978 WRITE32(0);
2979 WRITE32(0); /* XXX: is NULL principal ok? */
2980 break;
2981 case NFS4_OPEN_DELEGATE_WRITE:
2982 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
2983 if (nfserr)
2984 return nfserr;
2985 p = xdr_reserve_space(xdr, 32);
2986 if (!p)
2987 return nfserr_resource;
2988 WRITE32(0);
2989
2990 /*
2991 * TODO: space_limit's in delegations
2992 */
2993 WRITE32(NFS4_LIMIT_SIZE);
2994 WRITE32(~(u32)0);
2995 WRITE32(~(u32)0);
2996
2997 /*
2998 * TODO: ACE's in delegations
2999 */
3000 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3001 WRITE32(0);
3002 WRITE32(0);
3003 WRITE32(0); /* XXX: is NULL principal ok? */
3004 break;
3005 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3006 switch (open->op_why_no_deleg) {
3007 case WND4_CONTENTION:
3008 case WND4_RESOURCE:
3009 p = xdr_reserve_space(xdr, 8);
3010 if (!p)
3011 return nfserr_resource;
3012 WRITE32(open->op_why_no_deleg);
3013 WRITE32(0); /* deleg signaling not supported yet */
3014 break;
3015 default:
3016 p = xdr_reserve_space(xdr, 4);
3017 if (!p)
3018 return nfserr_resource;
3019 WRITE32(open->op_why_no_deleg);
3020 }
3021 break;
3022 default:
3023 BUG();
3024 }
3025 /* XXX save filehandle here */
3026 out:
3027 return nfserr;
3028 }
3029
3030 static __be32
3031 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3032 {
3033 struct xdr_stream *xdr = &resp->xdr;
3034
3035 if (!nfserr)
3036 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3037
3038 return nfserr;
3039 }
3040
3041 static __be32
3042 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3043 {
3044 struct xdr_stream *xdr = &resp->xdr;
3045
3046 if (!nfserr)
3047 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3048
3049 return nfserr;
3050 }
3051
3052 static __be32
3053 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3054 struct nfsd4_read *read)
3055 {
3056 u32 eof;
3057 int v;
3058 struct page *page;
3059 unsigned long maxcount;
3060 struct xdr_stream *xdr = &resp->xdr;
3061 int starting_len = xdr->buf->len;
3062 long len;
3063 __be32 *p;
3064
3065 if (nfserr)
3066 return nfserr;
3067 if (resp->xdr.buf->page_len)
3068 return nfserr_resource;
3069
3070 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3071 if (!p)
3072 return nfserr_resource;
3073
3074 maxcount = svc_max_payload(resp->rqstp);
3075 if (maxcount > read->rd_length)
3076 maxcount = read->rd_length;
3077
3078 len = maxcount;
3079 v = 0;
3080 while (len > 0) {
3081 page = *(resp->rqstp->rq_next_page);
3082 if (!page) { /* ran out of pages */
3083 maxcount -= len;
3084 break;
3085 }
3086 resp->rqstp->rq_vec[v].iov_base = page_address(page);
3087 resp->rqstp->rq_vec[v].iov_len =
3088 len < PAGE_SIZE ? len : PAGE_SIZE;
3089 resp->rqstp->rq_next_page++;
3090 v++;
3091 len -= PAGE_SIZE;
3092 }
3093 read->rd_vlen = v;
3094
3095 nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
3096 read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
3097 &maxcount);
3098
3099 if (nfserr) {
3100 /*
3101 * nfsd_splice_actor may have already messed with the
3102 * page length; reset it so as not to confuse
3103 * xdr_truncate_encode:
3104 */
3105 xdr->buf->page_len = 0;
3106 xdr_truncate_encode(xdr, starting_len);
3107 return nfserr;
3108 }
3109 eof = (read->rd_offset + maxcount >=
3110 read->rd_fhp->fh_dentry->d_inode->i_size);
3111
3112 WRITE32(eof);
3113 WRITE32(maxcount);
3114 WARN_ON_ONCE(resp->xdr.buf->head[0].iov_len != (char *)p
3115 - (char *)resp->xdr.buf->head[0].iov_base);
3116 resp->xdr.buf->page_len = maxcount;
3117 xdr->buf->len += maxcount;
3118 xdr->iov = xdr->buf->tail;
3119
3120 /* Use rest of head for padding and remaining ops: */
3121 resp->xdr.buf->tail[0].iov_base = p;
3122 resp->xdr.buf->tail[0].iov_len = 0;
3123 if (maxcount&3) {
3124 p = xdr_reserve_space(xdr, 4);
3125 if (!p)
3126 return nfserr_resource;
3127 WRITE32(0);
3128 resp->xdr.buf->tail[0].iov_base += maxcount&3;
3129 resp->xdr.buf->tail[0].iov_len = 4 - (maxcount&3);
3130 xdr->buf->len -= (maxcount&3);
3131 }
3132 return 0;
3133 }
3134
3135 static __be32
3136 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3137 {
3138 int maxcount;
3139 struct xdr_stream *xdr = &resp->xdr;
3140 char *page;
3141 int length_offset = xdr->buf->len;
3142 __be32 *p;
3143
3144 if (nfserr)
3145 return nfserr;
3146 if (resp->xdr.buf->page_len)
3147 return nfserr_resource;
3148 if (!*resp->rqstp->rq_next_page)
3149 return nfserr_resource;
3150
3151 page = page_address(*(resp->rqstp->rq_next_page++));
3152
3153 maxcount = PAGE_SIZE;
3154
3155 p = xdr_reserve_space(xdr, 4);
3156 if (!p)
3157 return nfserr_resource;
3158
3159 /*
3160 * XXX: By default, the ->readlink() VFS op will truncate symlinks
3161 * if they would overflow the buffer. Is this kosher in NFSv4? If
3162 * not, one easy fix is: if ->readlink() precisely fills the buffer,
3163 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3164 */
3165 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
3166 if (nfserr == nfserr_isdir)
3167 nfserr = nfserr_inval;
3168 if (nfserr) {
3169 xdr_truncate_encode(xdr, length_offset);
3170 return nfserr;
3171 }
3172
3173 WRITE32(maxcount);
3174 resp->xdr.buf->head[0].iov_len = (char *)p
3175 - (char *)resp->xdr.buf->head[0].iov_base;
3176 resp->xdr.buf->page_len = maxcount;
3177 xdr->buf->len += maxcount;
3178 xdr->iov = xdr->buf->tail;
3179
3180 /* Use rest of head for padding and remaining ops: */
3181 resp->xdr.buf->tail[0].iov_base = p;
3182 resp->xdr.buf->tail[0].iov_len = 0;
3183 if (maxcount&3) {
3184 p = xdr_reserve_space(xdr, 4);
3185 if (!p)
3186 return nfserr_resource;
3187 WRITE32(0);
3188 resp->xdr.buf->tail[0].iov_base += maxcount&3;
3189 resp->xdr.buf->tail[0].iov_len = 4 - (maxcount&3);
3190 }
3191 return 0;
3192 }
3193
3194 static __be32
3195 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3196 {
3197 int maxcount;
3198 loff_t offset;
3199 struct xdr_stream *xdr = &resp->xdr;
3200 int starting_len = xdr->buf->len;
3201 __be32 *page, *tailbase;
3202 __be32 *p;
3203
3204 if (nfserr)
3205 return nfserr;
3206 if (resp->xdr.buf->page_len)
3207 return nfserr_resource;
3208 if (!*resp->rqstp->rq_next_page)
3209 return nfserr_resource;
3210
3211 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3212 if (!p)
3213 return nfserr_resource;
3214
3215 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3216 WRITE32(0);
3217 WRITE32(0);
3218 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3219 - (char *)resp->xdr.buf->head[0].iov_base;
3220 tailbase = p;
3221
3222 maxcount = PAGE_SIZE;
3223 if (maxcount > readdir->rd_maxcount)
3224 maxcount = readdir->rd_maxcount;
3225
3226 /*
3227 * Convert from bytes to words, account for the two words already
3228 * written, make sure to leave two words at the end for the next
3229 * pointer and eof field.
3230 */
3231 maxcount = (maxcount >> 2) - 4;
3232 if (maxcount < 0) {
3233 nfserr = nfserr_toosmall;
3234 goto err_no_verf;
3235 }
3236
3237 page = page_address(*(resp->rqstp->rq_next_page++));
3238 readdir->common.err = 0;
3239 readdir->buflen = maxcount;
3240 readdir->buffer = page;
3241 readdir->offset = NULL;
3242
3243 offset = readdir->rd_cookie;
3244 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3245 &offset,
3246 &readdir->common, nfsd4_encode_dirent);
3247 if (nfserr == nfs_ok &&
3248 readdir->common.err == nfserr_toosmall &&
3249 readdir->buffer == page)
3250 nfserr = nfserr_toosmall;
3251 if (nfserr)
3252 goto err_no_verf;
3253
3254 if (readdir->offset)
3255 xdr_encode_hyper(readdir->offset, offset);
3256
3257 p = readdir->buffer;
3258 *p++ = 0; /* no more entries */
3259 *p++ = htonl(readdir->common.err == nfserr_eof);
3260 resp->xdr.buf->page_len = ((char *)p) -
3261 (char*)page_address(*(resp->rqstp->rq_next_page-1));
3262 xdr->buf->len += xdr->buf->page_len;
3263
3264 xdr->iov = xdr->buf->tail;
3265
3266 /* Use rest of head for padding and remaining ops: */
3267 resp->xdr.buf->tail[0].iov_base = tailbase;
3268 resp->xdr.buf->tail[0].iov_len = 0;
3269 resp->xdr.p = resp->xdr.buf->tail[0].iov_base;
3270 resp->xdr.end = resp->xdr.p +
3271 (PAGE_SIZE - resp->xdr.buf->head[0].iov_len)/4;
3272
3273 return 0;
3274 err_no_verf:
3275 xdr_truncate_encode(xdr, starting_len);
3276 return nfserr;
3277 }
3278
3279 static __be32
3280 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3281 {
3282 struct xdr_stream *xdr = &resp->xdr;
3283 __be32 *p;
3284
3285 if (!nfserr) {
3286 p = xdr_reserve_space(xdr, 20);
3287 if (!p)
3288 return nfserr_resource;
3289 write_cinfo(&p, &remove->rm_cinfo);
3290 }
3291 return nfserr;
3292 }
3293
3294 static __be32
3295 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3296 {
3297 struct xdr_stream *xdr = &resp->xdr;
3298 __be32 *p;
3299
3300 if (!nfserr) {
3301 p = xdr_reserve_space(xdr, 40);
3302 if (!p)
3303 return nfserr_resource;
3304 write_cinfo(&p, &rename->rn_sinfo);
3305 write_cinfo(&p, &rename->rn_tinfo);
3306 }
3307 return nfserr;
3308 }
3309
3310 static __be32
3311 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3312 __be32 nfserr, struct svc_export *exp)
3313 {
3314 u32 i, nflavs, supported;
3315 struct exp_flavor_info *flavs;
3316 struct exp_flavor_info def_flavs[2];
3317 __be32 *p, *flavorsp;
3318 static bool report = true;
3319
3320 if (nfserr)
3321 goto out;
3322 nfserr = nfserr_resource;
3323 if (exp->ex_nflavors) {
3324 flavs = exp->ex_flavors;
3325 nflavs = exp->ex_nflavors;
3326 } else { /* Handling of some defaults in absence of real secinfo: */
3327 flavs = def_flavs;
3328 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3329 nflavs = 2;
3330 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3331 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3332 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3333 nflavs = 1;
3334 flavs[0].pseudoflavor
3335 = svcauth_gss_flavor(exp->ex_client);
3336 } else {
3337 nflavs = 1;
3338 flavs[0].pseudoflavor
3339 = exp->ex_client->flavour->flavour;
3340 }
3341 }
3342
3343 supported = 0;
3344 p = xdr_reserve_space(xdr, 4);
3345 if (!p)
3346 goto out;
3347 flavorsp = p++; /* to be backfilled later */
3348
3349 for (i = 0; i < nflavs; i++) {
3350 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3351 struct rpcsec_gss_info info;
3352
3353 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3354 supported++;
3355 p = xdr_reserve_space(xdr, 4 + 4 +
3356 XDR_LEN(info.oid.len) + 4 + 4);
3357 if (!p)
3358 goto out;
3359 WRITE32(RPC_AUTH_GSS);
3360 WRITE32(info.oid.len);
3361 WRITEMEM(info.oid.data, info.oid.len);
3362 WRITE32(info.qop);
3363 WRITE32(info.service);
3364 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3365 supported++;
3366 p = xdr_reserve_space(xdr, 4);
3367 if (!p)
3368 goto out;
3369 WRITE32(pf);
3370 } else {
3371 if (report)
3372 pr_warn("NFS: SECINFO: security flavor %u "
3373 "is not supported\n", pf);
3374 }
3375 }
3376
3377 if (nflavs != supported)
3378 report = false;
3379 *flavorsp = htonl(supported);
3380 nfserr = 0;
3381 out:
3382 if (exp)
3383 exp_put(exp);
3384 return nfserr;
3385 }
3386
3387 static __be32
3388 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3389 struct nfsd4_secinfo *secinfo)
3390 {
3391 struct xdr_stream *xdr = &resp->xdr;
3392
3393 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3394 }
3395
3396 static __be32
3397 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3398 struct nfsd4_secinfo_no_name *secinfo)
3399 {
3400 struct xdr_stream *xdr = &resp->xdr;
3401
3402 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3403 }
3404
3405 /*
3406 * The SETATTR encode routine is special -- it always encodes a bitmap,
3407 * regardless of the error status.
3408 */
3409 static __be32
3410 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3411 {
3412 struct xdr_stream *xdr = &resp->xdr;
3413 __be32 *p;
3414
3415 p = xdr_reserve_space(xdr, 16);
3416 if (!p)
3417 return nfserr_resource;
3418 if (nfserr) {
3419 WRITE32(3);
3420 WRITE32(0);
3421 WRITE32(0);
3422 WRITE32(0);
3423 }
3424 else {
3425 WRITE32(3);
3426 WRITE32(setattr->sa_bmval[0]);
3427 WRITE32(setattr->sa_bmval[1]);
3428 WRITE32(setattr->sa_bmval[2]);
3429 }
3430 return nfserr;
3431 }
3432
3433 static __be32
3434 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3435 {
3436 struct xdr_stream *xdr = &resp->xdr;
3437 __be32 *p;
3438
3439 if (!nfserr) {
3440 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3441 if (!p)
3442 return nfserr_resource;
3443 WRITEMEM(&scd->se_clientid, 8);
3444 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3445 }
3446 else if (nfserr == nfserr_clid_inuse) {
3447 p = xdr_reserve_space(xdr, 8);
3448 if (!p)
3449 return nfserr_resource;
3450 WRITE32(0);
3451 WRITE32(0);
3452 }
3453 return nfserr;
3454 }
3455
3456 static __be32
3457 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3458 {
3459 struct xdr_stream *xdr = &resp->xdr;
3460 __be32 *p;
3461
3462 if (!nfserr) {
3463 p = xdr_reserve_space(xdr, 16);
3464 if (!p)
3465 return nfserr_resource;
3466 WRITE32(write->wr_bytes_written);
3467 WRITE32(write->wr_how_written);
3468 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3469 }
3470 return nfserr;
3471 }
3472
3473 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3474 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3475 1 << (OP_EXCHANGE_ID - 32) |
3476 1 << (OP_CREATE_SESSION - 32) |
3477 1 << (OP_DESTROY_SESSION - 32) |
3478 1 << (OP_DESTROY_CLIENTID - 32)
3479 };
3480
3481 static __be32
3482 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3483 struct nfsd4_exchange_id *exid)
3484 {
3485 struct xdr_stream *xdr = &resp->xdr;
3486 __be32 *p;
3487 char *major_id;
3488 char *server_scope;
3489 int major_id_sz;
3490 int server_scope_sz;
3491 uint64_t minor_id = 0;
3492
3493 if (nfserr)
3494 return nfserr;
3495
3496 major_id = utsname()->nodename;
3497 major_id_sz = strlen(major_id);
3498 server_scope = utsname()->nodename;
3499 server_scope_sz = strlen(server_scope);
3500
3501 p = xdr_reserve_space(xdr,
3502 8 /* eir_clientid */ +
3503 4 /* eir_sequenceid */ +
3504 4 /* eir_flags */ +
3505 4 /* spr_how */);
3506 if (!p)
3507 return nfserr_resource;
3508
3509 WRITEMEM(&exid->clientid, 8);
3510 WRITE32(exid->seqid);
3511 WRITE32(exid->flags);
3512
3513 WRITE32(exid->spa_how);
3514
3515 switch (exid->spa_how) {
3516 case SP4_NONE:
3517 break;
3518 case SP4_MACH_CRED:
3519 /* spo_must_enforce, spo_must_allow */
3520 p = xdr_reserve_space(xdr, 16);
3521 if (!p)
3522 return nfserr_resource;
3523
3524 /* spo_must_enforce bitmap: */
3525 WRITE32(2);
3526 WRITE32(nfs4_minimal_spo_must_enforce[0]);
3527 WRITE32(nfs4_minimal_spo_must_enforce[1]);
3528 /* empty spo_must_allow bitmap: */
3529 WRITE32(0);
3530
3531 break;
3532 default:
3533 WARN_ON_ONCE(1);
3534 }
3535
3536 p = xdr_reserve_space(xdr,
3537 8 /* so_minor_id */ +
3538 4 /* so_major_id.len */ +
3539 (XDR_QUADLEN(major_id_sz) * 4) +
3540 4 /* eir_server_scope.len */ +
3541 (XDR_QUADLEN(server_scope_sz) * 4) +
3542 4 /* eir_server_impl_id.count (0) */);
3543 if (!p)
3544 return nfserr_resource;
3545
3546 /* The server_owner struct */
3547 WRITE64(minor_id); /* Minor id */
3548 /* major id */
3549 WRITE32(major_id_sz);
3550 WRITEMEM(major_id, major_id_sz);
3551
3552 /* Server scope */
3553 WRITE32(server_scope_sz);
3554 WRITEMEM(server_scope, server_scope_sz);
3555
3556 /* Implementation id */
3557 WRITE32(0); /* zero length nfs_impl_id4 array */
3558 return 0;
3559 }
3560
3561 static __be32
3562 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3563 struct nfsd4_create_session *sess)
3564 {
3565 struct xdr_stream *xdr = &resp->xdr;
3566 __be32 *p;
3567
3568 if (nfserr)
3569 return nfserr;
3570
3571 p = xdr_reserve_space(xdr, 24);
3572 if (!p)
3573 return nfserr_resource;
3574 WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3575 WRITE32(sess->seqid);
3576 WRITE32(sess->flags);
3577
3578 p = xdr_reserve_space(xdr, 28);
3579 if (!p)
3580 return nfserr_resource;
3581 WRITE32(0); /* headerpadsz */
3582 WRITE32(sess->fore_channel.maxreq_sz);
3583 WRITE32(sess->fore_channel.maxresp_sz);
3584 WRITE32(sess->fore_channel.maxresp_cached);
3585 WRITE32(sess->fore_channel.maxops);
3586 WRITE32(sess->fore_channel.maxreqs);
3587 WRITE32(sess->fore_channel.nr_rdma_attrs);
3588
3589 if (sess->fore_channel.nr_rdma_attrs) {
3590 p = xdr_reserve_space(xdr, 4);
3591 if (!p)
3592 return nfserr_resource;
3593 WRITE32(sess->fore_channel.rdma_attrs);
3594 }
3595
3596 p = xdr_reserve_space(xdr, 28);
3597 if (!p)
3598 return nfserr_resource;
3599 WRITE32(0); /* headerpadsz */
3600 WRITE32(sess->back_channel.maxreq_sz);
3601 WRITE32(sess->back_channel.maxresp_sz);
3602 WRITE32(sess->back_channel.maxresp_cached);
3603 WRITE32(sess->back_channel.maxops);
3604 WRITE32(sess->back_channel.maxreqs);
3605 WRITE32(sess->back_channel.nr_rdma_attrs);
3606
3607 if (sess->back_channel.nr_rdma_attrs) {
3608 p = xdr_reserve_space(xdr, 4);
3609 if (!p)
3610 return nfserr_resource;
3611 WRITE32(sess->back_channel.rdma_attrs);
3612 }
3613 return 0;
3614 }
3615
3616 static __be32
3617 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3618 struct nfsd4_sequence *seq)
3619 {
3620 struct xdr_stream *xdr = &resp->xdr;
3621 __be32 *p;
3622
3623 if (nfserr)
3624 return nfserr;
3625
3626 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3627 if (!p)
3628 return nfserr_resource;
3629 WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3630 WRITE32(seq->seqid);
3631 WRITE32(seq->slotid);
3632 /* Note slotid's are numbered from zero: */
3633 WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3634 WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3635 WRITE32(seq->status_flags);
3636
3637 resp->cstate.datap = p; /* DRC cache data pointer */
3638 return 0;
3639 }
3640
3641 static __be32
3642 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3643 struct nfsd4_test_stateid *test_stateid)
3644 {
3645 struct xdr_stream *xdr = &resp->xdr;
3646 struct nfsd4_test_stateid_id *stateid, *next;
3647 __be32 *p;
3648
3649 if (nfserr)
3650 return nfserr;
3651
3652 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3653 if (!p)
3654 return nfserr_resource;
3655 *p++ = htonl(test_stateid->ts_num_ids);
3656
3657 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3658 *p++ = stateid->ts_id_status;
3659 }
3660
3661 return nfserr;
3662 }
3663
3664 static __be32
3665 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3666 {
3667 return nfserr;
3668 }
3669
3670 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3671
3672 /*
3673 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3674 * since we don't need to filter out obsolete ops as this is
3675 * done in the decoding phase.
3676 */
3677 static nfsd4_enc nfsd4_enc_ops[] = {
3678 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
3679 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
3680 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
3681 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
3682 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
3683 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3684 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
3685 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
3686 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
3687 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
3688 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
3689 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
3690 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
3691 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
3692 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3693 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
3694 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
3695 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
3696 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
3697 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
3698 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
3699 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
3700 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
3701 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
3702 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
3703 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
3704 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
3705 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
3706 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
3707 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
3708 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
3709 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
3710 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
3711 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3712 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3713 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
3714 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
3715
3716 /* NFSv4.1 operations */
3717 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
3718 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3719 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
3720 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
3721 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3722 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
3723 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3724 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
3725 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
3726 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
3727 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
3728 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3729 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3730 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
3731 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
3732 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
3733 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3734 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
3735 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
3736 };
3737
3738 /*
3739 * Calculate the total amount of memory that the compound response has taken
3740 * after encoding the current operation with pad.
3741 *
3742 * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3743 * which was specified at nfsd4_operation, else pad is zero.
3744 *
3745 * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3746 *
3747 * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3748 * will be at least a page and will therefore hold the xdr_buf head.
3749 */
3750 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3751 {
3752 struct xdr_buf *xb = &resp->rqstp->rq_res;
3753 struct nfsd4_session *session = NULL;
3754 struct nfsd4_slot *slot = resp->cstate.slot;
3755 u32 length, tlen = 0;
3756
3757 if (!nfsd4_has_session(&resp->cstate))
3758 return 0;
3759
3760 session = resp->cstate.session;
3761
3762 if (xb->page_len == 0) {
3763 length = (char *)resp->xdr.p - (char *)xb->head[0].iov_base + pad;
3764 } else {
3765 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3766 tlen = (char *)resp->xdr.p - (char *)xb->tail[0].iov_base;
3767
3768 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3769 }
3770 dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3771 length, xb->page_len, tlen, pad);
3772
3773 if (length > session->se_fchannel.maxresp_sz)
3774 return nfserr_rep_too_big;
3775
3776 if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3777 length > session->se_fchannel.maxresp_cached)
3778 return nfserr_rep_too_big_to_cache;
3779
3780 return 0;
3781 }
3782
3783 void
3784 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3785 {
3786 struct xdr_stream *xdr = &resp->xdr;
3787 struct nfs4_stateowner *so = resp->cstate.replay_owner;
3788 struct svc_rqst *rqstp = resp->rqstp;
3789 int post_err_offset;
3790 nfsd4_enc encoder;
3791 __be32 *p;
3792
3793 p = xdr_reserve_space(xdr, 8);
3794 if (!p) {
3795 WARN_ON_ONCE(1);
3796 return;
3797 }
3798 WRITE32(op->opnum);
3799 post_err_offset = xdr->buf->len;
3800
3801 if (op->opnum == OP_ILLEGAL)
3802 goto status;
3803 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3804 !nfsd4_enc_ops[op->opnum]);
3805 encoder = nfsd4_enc_ops[op->opnum];
3806 op->status = encoder(resp, op->status, &op->u);
3807 /* nfsd4_check_resp_size guarantees enough room for error status */
3808 if (!op->status) {
3809 int space_needed = 0;
3810 if (!nfsd4_last_compound_op(rqstp))
3811 space_needed = COMPOUND_ERR_SLACK_SPACE;
3812 op->status = nfsd4_check_resp_size(resp, space_needed);
3813 }
3814 if (op->status == nfserr_resource ||
3815 op->status == nfserr_rep_too_big ||
3816 op->status == nfserr_rep_too_big_to_cache) {
3817 /*
3818 * The operation may have already been encoded or
3819 * partially encoded. No op returns anything additional
3820 * in the case of one of these three errors, so we can
3821 * just truncate back to after the status. But it's a
3822 * bug if we had to do this on a non-idempotent op:
3823 */
3824 warn_on_nonidempotent_op(op);
3825 xdr_truncate_encode(xdr, post_err_offset);
3826 }
3827 if (so) {
3828 int len = xdr->buf->len - post_err_offset;
3829
3830 so->so_replay.rp_status = op->status;
3831 so->so_replay.rp_buflen = len;
3832 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
3833 so->so_replay.rp_buf, len);
3834 }
3835 status:
3836 /* Note that op->status is already in network byte order: */
3837 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
3838 }
3839
3840 /*
3841 * Encode the reply stored in the stateowner reply cache
3842 *
3843 * XDR note: do not encode rp->rp_buflen: the buffer contains the
3844 * previously sent already encoded operation.
3845 *
3846 * called with nfs4_lock_state() held
3847 */
3848 void
3849 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
3850 {
3851 __be32 *p;
3852 struct nfs4_replay *rp = op->replay;
3853
3854 BUG_ON(!rp);
3855
3856 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
3857 if (!p) {
3858 WARN_ON_ONCE(1);
3859 return;
3860 }
3861 WRITE32(op->opnum);
3862 *p++ = rp->rp_status; /* already xdr'ed */
3863
3864 WRITEMEM(rp->rp_buf, rp->rp_buflen);
3865 }
3866
3867 int
3868 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3869 {
3870 return xdr_ressize_check(rqstp, p);
3871 }
3872
3873 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3874 {
3875 struct svc_rqst *rqstp = rq;
3876 struct nfsd4_compoundargs *args = rqstp->rq_argp;
3877
3878 if (args->ops != args->iops) {
3879 kfree(args->ops);
3880 args->ops = args->iops;
3881 }
3882 kfree(args->tmpp);
3883 args->tmpp = NULL;
3884 while (args->to_free) {
3885 struct tmpbuf *tb = args->to_free;
3886 args->to_free = tb->next;
3887 tb->release(tb->buf);
3888 kfree(tb);
3889 }
3890 return 1;
3891 }
3892
3893 int
3894 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3895 {
3896 if (rqstp->rq_arg.head[0].iov_len % 4) {
3897 /* client is nuts */
3898 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
3899 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
3900 return 0;
3901 }
3902 args->p = p;
3903 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3904 args->pagelist = rqstp->rq_arg.pages;
3905 args->pagelen = rqstp->rq_arg.page_len;
3906 args->tmpp = NULL;
3907 args->to_free = NULL;
3908 args->ops = args->iops;
3909 args->rqstp = rqstp;
3910
3911 return !nfsd4_decode_compound(args);
3912 }
3913
3914 int
3915 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3916 {
3917 /*
3918 * All that remains is to write the tag and operation count...
3919 */
3920 struct nfsd4_compound_state *cs = &resp->cstate;
3921 struct xdr_buf *buf = resp->xdr.buf;
3922
3923 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
3924 buf->tail[0].iov_len);
3925
3926 p = resp->tagp;
3927 *p++ = htonl(resp->taglen);
3928 memcpy(p, resp->tag, resp->taglen);
3929 p += XDR_QUADLEN(resp->taglen);
3930 *p++ = htonl(resp->opcnt);
3931
3932 if (nfsd4_has_session(cs)) {
3933 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3934 struct nfs4_client *clp = cs->session->se_client;
3935 if (cs->status != nfserr_replay_cache) {
3936 nfsd4_store_cache_entry(resp);
3937 cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3938 }
3939 /* Renew the clientid on success and on replay */
3940 spin_lock(&nn->client_lock);
3941 nfsd4_put_session(cs->session);
3942 spin_unlock(&nn->client_lock);
3943 put_client_renew(clp);
3944 }
3945 return 1;
3946 }
3947
3948 /*
3949 * Local variables:
3950 * c-basic-offset: 8
3951 * End:
3952 */
Linux kernel - Deliverables
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