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Merge tag 'boards-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[mirror_ubuntu-artful-kernel.git] / fs / nfsd / nfs4xdr.c
1 /*
2 * Server-side XDR for NFSv4
3 *
4 * Copyright (c) 2002 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <andros@umich.edu>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 * 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 READMEM(x,nbytes) do { \
102 x = (char *)p; \
103 p += XDR_QUADLEN(nbytes); \
104 } while (0)
105 #define SAVEMEM(x,nbytes) do { \
106 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
107 savemem(argp, p, nbytes) : \
108 (char *)p)) { \
109 dprintk("NFSD: xdr error (%s:%d)\n", \
110 __FILE__, __LINE__); \
111 goto xdr_error; \
112 } \
113 p += XDR_QUADLEN(nbytes); \
114 } while (0)
115 #define COPYMEM(x,nbytes) do { \
116 memcpy((x), p, nbytes); \
117 p += XDR_QUADLEN(nbytes); \
118 } while (0)
119
120 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
121 #define READ_BUF(nbytes) do { \
122 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
123 p = argp->p; \
124 argp->p += XDR_QUADLEN(nbytes); \
125 } else if (!(p = read_buf(argp, nbytes))) { \
126 dprintk("NFSD: xdr error (%s:%d)\n", \
127 __FILE__, __LINE__); \
128 goto xdr_error; \
129 } \
130 } while (0)
131
132 static void next_decode_page(struct nfsd4_compoundargs *argp)
133 {
134 argp->p = page_address(argp->pagelist[0]);
135 argp->pagelist++;
136 if (argp->pagelen < PAGE_SIZE) {
137 argp->end = argp->p + (argp->pagelen>>2);
138 argp->pagelen = 0;
139 } else {
140 argp->end = argp->p + (PAGE_SIZE>>2);
141 argp->pagelen -= PAGE_SIZE;
142 }
143 }
144
145 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
146 {
147 /* We want more bytes than seem to be available.
148 * Maybe we need a new page, maybe we have just run out
149 */
150 unsigned int avail = (char *)argp->end - (char *)argp->p;
151 __be32 *p;
152 if (avail + argp->pagelen < nbytes)
153 return NULL;
154 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
155 return NULL;
156 /* ok, we can do it with the current plus the next page */
157 if (nbytes <= sizeof(argp->tmp))
158 p = argp->tmp;
159 else {
160 kfree(argp->tmpp);
161 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
162 if (!p)
163 return NULL;
164
165 }
166 /*
167 * The following memcpy is safe because read_buf is always
168 * called with nbytes > avail, and the two cases above both
169 * guarantee p points to at least nbytes bytes.
170 */
171 memcpy(p, argp->p, avail);
172 next_decode_page(argp);
173 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
174 argp->p += XDR_QUADLEN(nbytes - avail);
175 return p;
176 }
177
178 static int zero_clientid(clientid_t *clid)
179 {
180 return (clid->cl_boot == 0) && (clid->cl_id == 0);
181 }
182
183 /**
184 * defer_free - mark an allocation as deferred freed
185 * @argp: NFSv4 compound argument structure to be freed with
186 * @release: release callback to free @p, typically kfree()
187 * @p: pointer to be freed
188 *
189 * Marks @p to be freed when processing the compound operation
190 * described in @argp finishes.
191 */
192 static int
193 defer_free(struct nfsd4_compoundargs *argp,
194 void (*release)(const void *), void *p)
195 {
196 struct tmpbuf *tb;
197
198 tb = kmalloc(sizeof(*tb), GFP_KERNEL);
199 if (!tb)
200 return -ENOMEM;
201 tb->buf = p;
202 tb->release = release;
203 tb->next = argp->to_free;
204 argp->to_free = tb;
205 return 0;
206 }
207
208 /**
209 * savemem - duplicate a chunk of memory for later processing
210 * @argp: NFSv4 compound argument structure to be freed with
211 * @p: pointer to be duplicated
212 * @nbytes: length to be duplicated
213 *
214 * Returns a pointer to a copy of @nbytes bytes of memory at @p
215 * that are preserved until processing of the NFSv4 compound
216 * operation described by @argp finishes.
217 */
218 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
219 {
220 if (p == argp->tmp) {
221 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
222 if (!p)
223 return NULL;
224 } else {
225 BUG_ON(p != argp->tmpp);
226 argp->tmpp = NULL;
227 }
228 if (defer_free(argp, kfree, p)) {
229 kfree(p);
230 return NULL;
231 } else
232 return (char *)p;
233 }
234
235 static __be32
236 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
237 {
238 u32 bmlen;
239 DECODE_HEAD;
240
241 bmval[0] = 0;
242 bmval[1] = 0;
243 bmval[2] = 0;
244
245 READ_BUF(4);
246 bmlen = be32_to_cpup(p++);
247 if (bmlen > 1000)
248 goto xdr_error;
249
250 READ_BUF(bmlen << 2);
251 if (bmlen > 0)
252 bmval[0] = be32_to_cpup(p++);
253 if (bmlen > 1)
254 bmval[1] = be32_to_cpup(p++);
255 if (bmlen > 2)
256 bmval[2] = be32_to_cpup(p++);
257
258 DECODE_TAIL;
259 }
260
261 static __be32
262 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
263 struct iattr *iattr, struct nfs4_acl **acl,
264 struct xdr_netobj *label)
265 {
266 int expected_len, len = 0;
267 u32 dummy32;
268 u64 sec;
269 char *buf;
270
271 DECODE_HEAD;
272 iattr->ia_valid = 0;
273 if ((status = nfsd4_decode_bitmap(argp, bmval)))
274 return status;
275
276 READ_BUF(4);
277 expected_len = be32_to_cpup(p++);
278
279 if (bmval[0] & FATTR4_WORD0_SIZE) {
280 READ_BUF(8);
281 len += 8;
282 p = xdr_decode_hyper(p, &iattr->ia_size);
283 iattr->ia_valid |= ATTR_SIZE;
284 }
285 if (bmval[0] & FATTR4_WORD0_ACL) {
286 u32 nace;
287 struct nfs4_ace *ace;
288
289 READ_BUF(4); len += 4;
290 nace = be32_to_cpup(p++);
291
292 if (nace > NFS4_ACL_MAX)
293 return nfserr_fbig;
294
295 *acl = nfs4_acl_new(nace);
296 if (*acl == NULL)
297 return nfserr_jukebox;
298
299 defer_free(argp, kfree, *acl);
300
301 (*acl)->naces = nace;
302 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
303 READ_BUF(16); len += 16;
304 ace->type = be32_to_cpup(p++);
305 ace->flag = be32_to_cpup(p++);
306 ace->access_mask = be32_to_cpup(p++);
307 dummy32 = be32_to_cpup(p++);
308 READ_BUF(dummy32);
309 len += XDR_QUADLEN(dummy32) << 2;
310 READMEM(buf, dummy32);
311 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
312 status = nfs_ok;
313 if (ace->whotype != NFS4_ACL_WHO_NAMED)
314 ;
315 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
316 status = nfsd_map_name_to_gid(argp->rqstp,
317 buf, dummy32, &ace->who_gid);
318 else
319 status = nfsd_map_name_to_uid(argp->rqstp,
320 buf, dummy32, &ace->who_uid);
321 if (status)
322 return status;
323 }
324 } else
325 *acl = NULL;
326 if (bmval[1] & FATTR4_WORD1_MODE) {
327 READ_BUF(4);
328 len += 4;
329 iattr->ia_mode = be32_to_cpup(p++);
330 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
331 iattr->ia_valid |= ATTR_MODE;
332 }
333 if (bmval[1] & FATTR4_WORD1_OWNER) {
334 READ_BUF(4);
335 len += 4;
336 dummy32 = be32_to_cpup(p++);
337 READ_BUF(dummy32);
338 len += (XDR_QUADLEN(dummy32) << 2);
339 READMEM(buf, dummy32);
340 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
341 return status;
342 iattr->ia_valid |= ATTR_UID;
343 }
344 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
345 READ_BUF(4);
346 len += 4;
347 dummy32 = be32_to_cpup(p++);
348 READ_BUF(dummy32);
349 len += (XDR_QUADLEN(dummy32) << 2);
350 READMEM(buf, dummy32);
351 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
352 return status;
353 iattr->ia_valid |= ATTR_GID;
354 }
355 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
356 READ_BUF(4);
357 len += 4;
358 dummy32 = be32_to_cpup(p++);
359 switch (dummy32) {
360 case NFS4_SET_TO_CLIENT_TIME:
361 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
362 all 32 bits of 'nseconds'. */
363 READ_BUF(12);
364 len += 12;
365 p = xdr_decode_hyper(p, &sec);
366 iattr->ia_atime.tv_sec = (time_t)sec;
367 iattr->ia_atime.tv_nsec = be32_to_cpup(p++);
368 if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
369 return nfserr_inval;
370 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
371 break;
372 case NFS4_SET_TO_SERVER_TIME:
373 iattr->ia_valid |= ATTR_ATIME;
374 break;
375 default:
376 goto xdr_error;
377 }
378 }
379 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
380 READ_BUF(4);
381 len += 4;
382 dummy32 = be32_to_cpup(p++);
383 switch (dummy32) {
384 case NFS4_SET_TO_CLIENT_TIME:
385 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
386 all 32 bits of 'nseconds'. */
387 READ_BUF(12);
388 len += 12;
389 p = xdr_decode_hyper(p, &sec);
390 iattr->ia_mtime.tv_sec = sec;
391 iattr->ia_mtime.tv_nsec = be32_to_cpup(p++);
392 if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
393 return nfserr_inval;
394 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
395 break;
396 case NFS4_SET_TO_SERVER_TIME:
397 iattr->ia_valid |= ATTR_MTIME;
398 break;
399 default:
400 goto xdr_error;
401 }
402 }
403
404 label->len = 0;
405 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
406 if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
407 READ_BUF(4);
408 len += 4;
409 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
410 READ_BUF(4);
411 len += 4;
412 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
413 READ_BUF(4);
414 len += 4;
415 dummy32 = be32_to_cpup(p++);
416 READ_BUF(dummy32);
417 if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
418 return nfserr_badlabel;
419 len += (XDR_QUADLEN(dummy32) << 2);
420 READMEM(buf, dummy32);
421 label->data = kzalloc(dummy32 + 1, GFP_KERNEL);
422 if (!label->data)
423 return nfserr_jukebox;
424 label->len = dummy32;
425 defer_free(argp, kfree, label->data);
426 memcpy(label->data, buf, dummy32);
427 }
428 #endif
429
430 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
431 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
432 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
433 READ_BUF(expected_len - len);
434 else if (len != expected_len)
435 goto xdr_error;
436
437 DECODE_TAIL;
438 }
439
440 static __be32
441 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
442 {
443 DECODE_HEAD;
444
445 READ_BUF(sizeof(stateid_t));
446 sid->si_generation = be32_to_cpup(p++);
447 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
448
449 DECODE_TAIL;
450 }
451
452 static __be32
453 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
454 {
455 DECODE_HEAD;
456
457 READ_BUF(4);
458 access->ac_req_access = be32_to_cpup(p++);
459
460 DECODE_TAIL;
461 }
462
463 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
464 {
465 DECODE_HEAD;
466 u32 dummy, uid, gid;
467 char *machine_name;
468 int i;
469 int nr_secflavs;
470
471 /* callback_sec_params4 */
472 READ_BUF(4);
473 nr_secflavs = be32_to_cpup(p++);
474 if (nr_secflavs)
475 cbs->flavor = (u32)(-1);
476 else
477 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
478 cbs->flavor = 0;
479 for (i = 0; i < nr_secflavs; ++i) {
480 READ_BUF(4);
481 dummy = be32_to_cpup(p++);
482 switch (dummy) {
483 case RPC_AUTH_NULL:
484 /* Nothing to read */
485 if (cbs->flavor == (u32)(-1))
486 cbs->flavor = RPC_AUTH_NULL;
487 break;
488 case RPC_AUTH_UNIX:
489 READ_BUF(8);
490 /* stamp */
491 dummy = be32_to_cpup(p++);
492
493 /* machine name */
494 dummy = be32_to_cpup(p++);
495 READ_BUF(dummy);
496 SAVEMEM(machine_name, dummy);
497
498 /* uid, gid */
499 READ_BUF(8);
500 uid = be32_to_cpup(p++);
501 gid = be32_to_cpup(p++);
502
503 /* more gids */
504 READ_BUF(4);
505 dummy = be32_to_cpup(p++);
506 READ_BUF(dummy * 4);
507 if (cbs->flavor == (u32)(-1)) {
508 kuid_t kuid = make_kuid(&init_user_ns, uid);
509 kgid_t kgid = make_kgid(&init_user_ns, gid);
510 if (uid_valid(kuid) && gid_valid(kgid)) {
511 cbs->uid = kuid;
512 cbs->gid = kgid;
513 cbs->flavor = RPC_AUTH_UNIX;
514 } else {
515 dprintk("RPC_AUTH_UNIX with invalid"
516 "uid or gid ignoring!\n");
517 }
518 }
519 break;
520 case RPC_AUTH_GSS:
521 dprintk("RPC_AUTH_GSS callback secflavor "
522 "not supported!\n");
523 READ_BUF(8);
524 /* gcbp_service */
525 dummy = be32_to_cpup(p++);
526 /* gcbp_handle_from_server */
527 dummy = be32_to_cpup(p++);
528 READ_BUF(dummy);
529 p += XDR_QUADLEN(dummy);
530 /* gcbp_handle_from_client */
531 READ_BUF(4);
532 dummy = be32_to_cpup(p++);
533 READ_BUF(dummy);
534 break;
535 default:
536 dprintk("Illegal callback secflavor\n");
537 return nfserr_inval;
538 }
539 }
540 DECODE_TAIL;
541 }
542
543 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
544 {
545 DECODE_HEAD;
546
547 READ_BUF(4);
548 bc->bc_cb_program = be32_to_cpup(p++);
549 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
550
551 DECODE_TAIL;
552 }
553
554 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
555 {
556 DECODE_HEAD;
557
558 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
559 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
560 bcts->dir = be32_to_cpup(p++);
561 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
562 * could help us figure out we should be using it. */
563 DECODE_TAIL;
564 }
565
566 static __be32
567 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
568 {
569 DECODE_HEAD;
570
571 READ_BUF(4);
572 close->cl_seqid = be32_to_cpup(p++);
573 return nfsd4_decode_stateid(argp, &close->cl_stateid);
574
575 DECODE_TAIL;
576 }
577
578
579 static __be32
580 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
581 {
582 DECODE_HEAD;
583
584 READ_BUF(12);
585 p = xdr_decode_hyper(p, &commit->co_offset);
586 commit->co_count = be32_to_cpup(p++);
587
588 DECODE_TAIL;
589 }
590
591 static __be32
592 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
593 {
594 DECODE_HEAD;
595
596 READ_BUF(4);
597 create->cr_type = be32_to_cpup(p++);
598 switch (create->cr_type) {
599 case NF4LNK:
600 READ_BUF(4);
601 create->cr_linklen = be32_to_cpup(p++);
602 READ_BUF(create->cr_linklen);
603 /*
604 * The VFS will want a null-terminated string, and
605 * null-terminating in place isn't safe since this might
606 * end on a page boundary:
607 */
608 create->cr_linkname =
609 kmalloc(create->cr_linklen + 1, GFP_KERNEL);
610 if (!create->cr_linkname)
611 return nfserr_jukebox;
612 memcpy(create->cr_linkname, p, create->cr_linklen);
613 create->cr_linkname[create->cr_linklen] = '\0';
614 defer_free(argp, kfree, create->cr_linkname);
615 break;
616 case NF4BLK:
617 case NF4CHR:
618 READ_BUF(8);
619 create->cr_specdata1 = be32_to_cpup(p++);
620 create->cr_specdata2 = be32_to_cpup(p++);
621 break;
622 case NF4SOCK:
623 case NF4FIFO:
624 case NF4DIR:
625 default:
626 break;
627 }
628
629 READ_BUF(4);
630 create->cr_namelen = be32_to_cpup(p++);
631 READ_BUF(create->cr_namelen);
632 SAVEMEM(create->cr_name, create->cr_namelen);
633 if ((status = check_filename(create->cr_name, create->cr_namelen)))
634 return status;
635
636 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
637 &create->cr_acl, &create->cr_label);
638 if (status)
639 goto out;
640
641 DECODE_TAIL;
642 }
643
644 static inline __be32
645 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
646 {
647 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
648 }
649
650 static inline __be32
651 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
652 {
653 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
654 }
655
656 static __be32
657 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
658 {
659 DECODE_HEAD;
660
661 READ_BUF(4);
662 link->li_namelen = be32_to_cpup(p++);
663 READ_BUF(link->li_namelen);
664 SAVEMEM(link->li_name, link->li_namelen);
665 if ((status = check_filename(link->li_name, link->li_namelen)))
666 return status;
667
668 DECODE_TAIL;
669 }
670
671 static __be32
672 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
673 {
674 DECODE_HEAD;
675
676 /*
677 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
678 */
679 READ_BUF(28);
680 lock->lk_type = be32_to_cpup(p++);
681 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
682 goto xdr_error;
683 lock->lk_reclaim = be32_to_cpup(p++);
684 p = xdr_decode_hyper(p, &lock->lk_offset);
685 p = xdr_decode_hyper(p, &lock->lk_length);
686 lock->lk_is_new = be32_to_cpup(p++);
687
688 if (lock->lk_is_new) {
689 READ_BUF(4);
690 lock->lk_new_open_seqid = be32_to_cpup(p++);
691 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
692 if (status)
693 return status;
694 READ_BUF(8 + sizeof(clientid_t));
695 lock->lk_new_lock_seqid = be32_to_cpup(p++);
696 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
697 lock->lk_new_owner.len = be32_to_cpup(p++);
698 READ_BUF(lock->lk_new_owner.len);
699 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
700 } else {
701 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
702 if (status)
703 return status;
704 READ_BUF(4);
705 lock->lk_old_lock_seqid = be32_to_cpup(p++);
706 }
707
708 DECODE_TAIL;
709 }
710
711 static __be32
712 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
713 {
714 DECODE_HEAD;
715
716 READ_BUF(32);
717 lockt->lt_type = be32_to_cpup(p++);
718 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
719 goto xdr_error;
720 p = xdr_decode_hyper(p, &lockt->lt_offset);
721 p = xdr_decode_hyper(p, &lockt->lt_length);
722 COPYMEM(&lockt->lt_clientid, 8);
723 lockt->lt_owner.len = be32_to_cpup(p++);
724 READ_BUF(lockt->lt_owner.len);
725 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
726
727 DECODE_TAIL;
728 }
729
730 static __be32
731 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
732 {
733 DECODE_HEAD;
734
735 READ_BUF(8);
736 locku->lu_type = be32_to_cpup(p++);
737 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
738 goto xdr_error;
739 locku->lu_seqid = be32_to_cpup(p++);
740 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
741 if (status)
742 return status;
743 READ_BUF(16);
744 p = xdr_decode_hyper(p, &locku->lu_offset);
745 p = xdr_decode_hyper(p, &locku->lu_length);
746
747 DECODE_TAIL;
748 }
749
750 static __be32
751 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
752 {
753 DECODE_HEAD;
754
755 READ_BUF(4);
756 lookup->lo_len = be32_to_cpup(p++);
757 READ_BUF(lookup->lo_len);
758 SAVEMEM(lookup->lo_name, lookup->lo_len);
759 if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
760 return status;
761
762 DECODE_TAIL;
763 }
764
765 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
766 {
767 __be32 *p;
768 u32 w;
769
770 READ_BUF(4);
771 w = be32_to_cpup(p++);
772 *share_access = w & NFS4_SHARE_ACCESS_MASK;
773 *deleg_want = w & NFS4_SHARE_WANT_MASK;
774 if (deleg_when)
775 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
776
777 switch (w & NFS4_SHARE_ACCESS_MASK) {
778 case NFS4_SHARE_ACCESS_READ:
779 case NFS4_SHARE_ACCESS_WRITE:
780 case NFS4_SHARE_ACCESS_BOTH:
781 break;
782 default:
783 return nfserr_bad_xdr;
784 }
785 w &= ~NFS4_SHARE_ACCESS_MASK;
786 if (!w)
787 return nfs_ok;
788 if (!argp->minorversion)
789 return nfserr_bad_xdr;
790 switch (w & NFS4_SHARE_WANT_MASK) {
791 case NFS4_SHARE_WANT_NO_PREFERENCE:
792 case NFS4_SHARE_WANT_READ_DELEG:
793 case NFS4_SHARE_WANT_WRITE_DELEG:
794 case NFS4_SHARE_WANT_ANY_DELEG:
795 case NFS4_SHARE_WANT_NO_DELEG:
796 case NFS4_SHARE_WANT_CANCEL:
797 break;
798 default:
799 return nfserr_bad_xdr;
800 }
801 w &= ~NFS4_SHARE_WANT_MASK;
802 if (!w)
803 return nfs_ok;
804
805 if (!deleg_when) /* open_downgrade */
806 return nfserr_inval;
807 switch (w) {
808 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
809 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
810 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
811 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
812 return nfs_ok;
813 }
814 xdr_error:
815 return nfserr_bad_xdr;
816 }
817
818 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
819 {
820 __be32 *p;
821
822 READ_BUF(4);
823 *x = be32_to_cpup(p++);
824 /* Note: unlinke access bits, deny bits may be zero. */
825 if (*x & ~NFS4_SHARE_DENY_BOTH)
826 return nfserr_bad_xdr;
827 return nfs_ok;
828 xdr_error:
829 return nfserr_bad_xdr;
830 }
831
832 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
833 {
834 __be32 *p;
835
836 READ_BUF(4);
837 o->len = be32_to_cpup(p++);
838
839 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
840 return nfserr_bad_xdr;
841
842 READ_BUF(o->len);
843 SAVEMEM(o->data, o->len);
844 return nfs_ok;
845 xdr_error:
846 return nfserr_bad_xdr;
847 }
848
849 static __be32
850 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
851 {
852 DECODE_HEAD;
853 u32 dummy;
854
855 memset(open->op_bmval, 0, sizeof(open->op_bmval));
856 open->op_iattr.ia_valid = 0;
857 open->op_openowner = NULL;
858
859 open->op_xdr_error = 0;
860 /* seqid, share_access, share_deny, clientid, ownerlen */
861 READ_BUF(4);
862 open->op_seqid = be32_to_cpup(p++);
863 /* decode, yet ignore deleg_when until supported */
864 status = nfsd4_decode_share_access(argp, &open->op_share_access,
865 &open->op_deleg_want, &dummy);
866 if (status)
867 goto xdr_error;
868 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
869 if (status)
870 goto xdr_error;
871 READ_BUF(sizeof(clientid_t));
872 COPYMEM(&open->op_clientid, sizeof(clientid_t));
873 status = nfsd4_decode_opaque(argp, &open->op_owner);
874 if (status)
875 goto xdr_error;
876 READ_BUF(4);
877 open->op_create = be32_to_cpup(p++);
878 switch (open->op_create) {
879 case NFS4_OPEN_NOCREATE:
880 break;
881 case NFS4_OPEN_CREATE:
882 READ_BUF(4);
883 open->op_createmode = be32_to_cpup(p++);
884 switch (open->op_createmode) {
885 case NFS4_CREATE_UNCHECKED:
886 case NFS4_CREATE_GUARDED:
887 status = nfsd4_decode_fattr(argp, open->op_bmval,
888 &open->op_iattr, &open->op_acl, &open->op_label);
889 if (status)
890 goto out;
891 break;
892 case NFS4_CREATE_EXCLUSIVE:
893 READ_BUF(NFS4_VERIFIER_SIZE);
894 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
895 break;
896 case NFS4_CREATE_EXCLUSIVE4_1:
897 if (argp->minorversion < 1)
898 goto xdr_error;
899 READ_BUF(NFS4_VERIFIER_SIZE);
900 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
901 status = nfsd4_decode_fattr(argp, open->op_bmval,
902 &open->op_iattr, &open->op_acl, &open->op_label);
903 if (status)
904 goto out;
905 break;
906 default:
907 goto xdr_error;
908 }
909 break;
910 default:
911 goto xdr_error;
912 }
913
914 /* open_claim */
915 READ_BUF(4);
916 open->op_claim_type = be32_to_cpup(p++);
917 switch (open->op_claim_type) {
918 case NFS4_OPEN_CLAIM_NULL:
919 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
920 READ_BUF(4);
921 open->op_fname.len = be32_to_cpup(p++);
922 READ_BUF(open->op_fname.len);
923 SAVEMEM(open->op_fname.data, open->op_fname.len);
924 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
925 return status;
926 break;
927 case NFS4_OPEN_CLAIM_PREVIOUS:
928 READ_BUF(4);
929 open->op_delegate_type = be32_to_cpup(p++);
930 break;
931 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
932 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
933 if (status)
934 return status;
935 READ_BUF(4);
936 open->op_fname.len = be32_to_cpup(p++);
937 READ_BUF(open->op_fname.len);
938 SAVEMEM(open->op_fname.data, open->op_fname.len);
939 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
940 return status;
941 break;
942 case NFS4_OPEN_CLAIM_FH:
943 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
944 if (argp->minorversion < 1)
945 goto xdr_error;
946 /* void */
947 break;
948 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
949 if (argp->minorversion < 1)
950 goto xdr_error;
951 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
952 if (status)
953 return status;
954 break;
955 default:
956 goto xdr_error;
957 }
958
959 DECODE_TAIL;
960 }
961
962 static __be32
963 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
964 {
965 DECODE_HEAD;
966
967 if (argp->minorversion >= 1)
968 return nfserr_notsupp;
969
970 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
971 if (status)
972 return status;
973 READ_BUF(4);
974 open_conf->oc_seqid = be32_to_cpup(p++);
975
976 DECODE_TAIL;
977 }
978
979 static __be32
980 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
981 {
982 DECODE_HEAD;
983
984 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
985 if (status)
986 return status;
987 READ_BUF(4);
988 open_down->od_seqid = be32_to_cpup(p++);
989 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
990 &open_down->od_deleg_want, NULL);
991 if (status)
992 return status;
993 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
994 if (status)
995 return status;
996 DECODE_TAIL;
997 }
998
999 static __be32
1000 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1001 {
1002 DECODE_HEAD;
1003
1004 READ_BUF(4);
1005 putfh->pf_fhlen = be32_to_cpup(p++);
1006 if (putfh->pf_fhlen > NFS4_FHSIZE)
1007 goto xdr_error;
1008 READ_BUF(putfh->pf_fhlen);
1009 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1010
1011 DECODE_TAIL;
1012 }
1013
1014 static __be32
1015 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1016 {
1017 if (argp->minorversion == 0)
1018 return nfs_ok;
1019 return nfserr_notsupp;
1020 }
1021
1022 static __be32
1023 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1024 {
1025 DECODE_HEAD;
1026
1027 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1028 if (status)
1029 return status;
1030 READ_BUF(12);
1031 p = xdr_decode_hyper(p, &read->rd_offset);
1032 read->rd_length = be32_to_cpup(p++);
1033
1034 DECODE_TAIL;
1035 }
1036
1037 static __be32
1038 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1039 {
1040 DECODE_HEAD;
1041
1042 READ_BUF(24);
1043 p = xdr_decode_hyper(p, &readdir->rd_cookie);
1044 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1045 readdir->rd_dircount = be32_to_cpup(p++);
1046 readdir->rd_maxcount = be32_to_cpup(p++);
1047 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1048 goto out;
1049
1050 DECODE_TAIL;
1051 }
1052
1053 static __be32
1054 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1055 {
1056 DECODE_HEAD;
1057
1058 READ_BUF(4);
1059 remove->rm_namelen = be32_to_cpup(p++);
1060 READ_BUF(remove->rm_namelen);
1061 SAVEMEM(remove->rm_name, remove->rm_namelen);
1062 if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1063 return status;
1064
1065 DECODE_TAIL;
1066 }
1067
1068 static __be32
1069 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1070 {
1071 DECODE_HEAD;
1072
1073 READ_BUF(4);
1074 rename->rn_snamelen = be32_to_cpup(p++);
1075 READ_BUF(rename->rn_snamelen + 4);
1076 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1077 rename->rn_tnamelen = be32_to_cpup(p++);
1078 READ_BUF(rename->rn_tnamelen);
1079 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1080 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1081 return status;
1082 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1083 return status;
1084
1085 DECODE_TAIL;
1086 }
1087
1088 static __be32
1089 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1090 {
1091 DECODE_HEAD;
1092
1093 if (argp->minorversion >= 1)
1094 return nfserr_notsupp;
1095
1096 READ_BUF(sizeof(clientid_t));
1097 COPYMEM(clientid, sizeof(clientid_t));
1098
1099 DECODE_TAIL;
1100 }
1101
1102 static __be32
1103 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1104 struct nfsd4_secinfo *secinfo)
1105 {
1106 DECODE_HEAD;
1107
1108 READ_BUF(4);
1109 secinfo->si_namelen = be32_to_cpup(p++);
1110 READ_BUF(secinfo->si_namelen);
1111 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1112 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1113 if (status)
1114 return status;
1115 DECODE_TAIL;
1116 }
1117
1118 static __be32
1119 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1120 struct nfsd4_secinfo_no_name *sin)
1121 {
1122 DECODE_HEAD;
1123
1124 READ_BUF(4);
1125 sin->sin_style = be32_to_cpup(p++);
1126 DECODE_TAIL;
1127 }
1128
1129 static __be32
1130 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1131 {
1132 __be32 status;
1133
1134 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1135 if (status)
1136 return status;
1137 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1138 &setattr->sa_acl, &setattr->sa_label);
1139 }
1140
1141 static __be32
1142 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1143 {
1144 DECODE_HEAD;
1145
1146 if (argp->minorversion >= 1)
1147 return nfserr_notsupp;
1148
1149 READ_BUF(NFS4_VERIFIER_SIZE);
1150 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1151
1152 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1153 if (status)
1154 return nfserr_bad_xdr;
1155 READ_BUF(8);
1156 setclientid->se_callback_prog = be32_to_cpup(p++);
1157 setclientid->se_callback_netid_len = be32_to_cpup(p++);
1158
1159 READ_BUF(setclientid->se_callback_netid_len + 4);
1160 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1161 setclientid->se_callback_addr_len = be32_to_cpup(p++);
1162
1163 READ_BUF(setclientid->se_callback_addr_len + 4);
1164 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1165 setclientid->se_callback_ident = be32_to_cpup(p++);
1166
1167 DECODE_TAIL;
1168 }
1169
1170 static __be32
1171 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1172 {
1173 DECODE_HEAD;
1174
1175 if (argp->minorversion >= 1)
1176 return nfserr_notsupp;
1177
1178 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1179 COPYMEM(&scd_c->sc_clientid, 8);
1180 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1181
1182 DECODE_TAIL;
1183 }
1184
1185 /* Also used for NVERIFY */
1186 static __be32
1187 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1188 {
1189 DECODE_HEAD;
1190
1191 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1192 goto out;
1193
1194 /* For convenience's sake, we compare raw xdr'd attributes in
1195 * nfsd4_proc_verify */
1196
1197 READ_BUF(4);
1198 verify->ve_attrlen = be32_to_cpup(p++);
1199 READ_BUF(verify->ve_attrlen);
1200 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1201
1202 DECODE_TAIL;
1203 }
1204
1205 static __be32
1206 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1207 {
1208 int avail;
1209 int len;
1210 DECODE_HEAD;
1211
1212 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1213 if (status)
1214 return status;
1215 READ_BUF(16);
1216 p = xdr_decode_hyper(p, &write->wr_offset);
1217 write->wr_stable_how = be32_to_cpup(p++);
1218 if (write->wr_stable_how > 2)
1219 goto xdr_error;
1220 write->wr_buflen = be32_to_cpup(p++);
1221
1222 /* Sorry .. no magic macros for this.. *
1223 * READ_BUF(write->wr_buflen);
1224 * SAVEMEM(write->wr_buf, write->wr_buflen);
1225 */
1226 avail = (char*)argp->end - (char*)argp->p;
1227 if (avail + argp->pagelen < write->wr_buflen) {
1228 dprintk("NFSD: xdr error (%s:%d)\n",
1229 __FILE__, __LINE__);
1230 goto xdr_error;
1231 }
1232 write->wr_head.iov_base = p;
1233 write->wr_head.iov_len = avail;
1234 write->wr_pagelist = argp->pagelist;
1235
1236 len = XDR_QUADLEN(write->wr_buflen) << 2;
1237 if (len >= avail) {
1238 int pages;
1239
1240 len -= avail;
1241
1242 pages = len >> PAGE_SHIFT;
1243 argp->pagelist += pages;
1244 argp->pagelen -= pages * PAGE_SIZE;
1245 len -= pages * PAGE_SIZE;
1246
1247 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1248 argp->pagelist++;
1249 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1250 }
1251 argp->p += XDR_QUADLEN(len);
1252
1253 DECODE_TAIL;
1254 }
1255
1256 static __be32
1257 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1258 {
1259 DECODE_HEAD;
1260
1261 if (argp->minorversion >= 1)
1262 return nfserr_notsupp;
1263
1264 READ_BUF(12);
1265 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1266 rlockowner->rl_owner.len = be32_to_cpup(p++);
1267 READ_BUF(rlockowner->rl_owner.len);
1268 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1269
1270 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1271 return nfserr_inval;
1272 DECODE_TAIL;
1273 }
1274
1275 static __be32
1276 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1277 struct nfsd4_exchange_id *exid)
1278 {
1279 int dummy, tmp;
1280 DECODE_HEAD;
1281
1282 READ_BUF(NFS4_VERIFIER_SIZE);
1283 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1284
1285 status = nfsd4_decode_opaque(argp, &exid->clname);
1286 if (status)
1287 return nfserr_bad_xdr;
1288
1289 READ_BUF(4);
1290 exid->flags = be32_to_cpup(p++);
1291
1292 /* Ignore state_protect4_a */
1293 READ_BUF(4);
1294 exid->spa_how = be32_to_cpup(p++);
1295 switch (exid->spa_how) {
1296 case SP4_NONE:
1297 break;
1298 case SP4_MACH_CRED:
1299 /* spo_must_enforce */
1300 READ_BUF(4);
1301 dummy = be32_to_cpup(p++);
1302 READ_BUF(dummy * 4);
1303 p += dummy;
1304
1305 /* spo_must_allow */
1306 READ_BUF(4);
1307 dummy = be32_to_cpup(p++);
1308 READ_BUF(dummy * 4);
1309 p += dummy;
1310 break;
1311 case SP4_SSV:
1312 /* ssp_ops */
1313 READ_BUF(4);
1314 dummy = be32_to_cpup(p++);
1315 READ_BUF(dummy * 4);
1316 p += dummy;
1317
1318 READ_BUF(4);
1319 dummy = be32_to_cpup(p++);
1320 READ_BUF(dummy * 4);
1321 p += dummy;
1322
1323 /* ssp_hash_algs<> */
1324 READ_BUF(4);
1325 tmp = be32_to_cpup(p++);
1326 while (tmp--) {
1327 READ_BUF(4);
1328 dummy = be32_to_cpup(p++);
1329 READ_BUF(dummy);
1330 p += XDR_QUADLEN(dummy);
1331 }
1332
1333 /* ssp_encr_algs<> */
1334 READ_BUF(4);
1335 tmp = be32_to_cpup(p++);
1336 while (tmp--) {
1337 READ_BUF(4);
1338 dummy = be32_to_cpup(p++);
1339 READ_BUF(dummy);
1340 p += XDR_QUADLEN(dummy);
1341 }
1342
1343 /* ssp_window and ssp_num_gss_handles */
1344 READ_BUF(8);
1345 dummy = be32_to_cpup(p++);
1346 dummy = be32_to_cpup(p++);
1347 break;
1348 default:
1349 goto xdr_error;
1350 }
1351
1352 /* Ignore Implementation ID */
1353 READ_BUF(4); /* nfs_impl_id4 array length */
1354 dummy = be32_to_cpup(p++);
1355
1356 if (dummy > 1)
1357 goto xdr_error;
1358
1359 if (dummy == 1) {
1360 /* nii_domain */
1361 READ_BUF(4);
1362 dummy = be32_to_cpup(p++);
1363 READ_BUF(dummy);
1364 p += XDR_QUADLEN(dummy);
1365
1366 /* nii_name */
1367 READ_BUF(4);
1368 dummy = be32_to_cpup(p++);
1369 READ_BUF(dummy);
1370 p += XDR_QUADLEN(dummy);
1371
1372 /* nii_date */
1373 READ_BUF(12);
1374 p += 3;
1375 }
1376 DECODE_TAIL;
1377 }
1378
1379 static __be32
1380 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1381 struct nfsd4_create_session *sess)
1382 {
1383 DECODE_HEAD;
1384 u32 dummy;
1385
1386 READ_BUF(16);
1387 COPYMEM(&sess->clientid, 8);
1388 sess->seqid = be32_to_cpup(p++);
1389 sess->flags = be32_to_cpup(p++);
1390
1391 /* Fore channel attrs */
1392 READ_BUF(28);
1393 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1394 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1395 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1396 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1397 sess->fore_channel.maxops = be32_to_cpup(p++);
1398 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1399 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1400 if (sess->fore_channel.nr_rdma_attrs == 1) {
1401 READ_BUF(4);
1402 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1403 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1404 dprintk("Too many fore channel attr bitmaps!\n");
1405 goto xdr_error;
1406 }
1407
1408 /* Back channel attrs */
1409 READ_BUF(28);
1410 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1411 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1412 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1413 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1414 sess->back_channel.maxops = be32_to_cpup(p++);
1415 sess->back_channel.maxreqs = be32_to_cpup(p++);
1416 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1417 if (sess->back_channel.nr_rdma_attrs == 1) {
1418 READ_BUF(4);
1419 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1420 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1421 dprintk("Too many back channel attr bitmaps!\n");
1422 goto xdr_error;
1423 }
1424
1425 READ_BUF(4);
1426 sess->callback_prog = be32_to_cpup(p++);
1427 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1428 DECODE_TAIL;
1429 }
1430
1431 static __be32
1432 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1433 struct nfsd4_destroy_session *destroy_session)
1434 {
1435 DECODE_HEAD;
1436 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1437 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1438
1439 DECODE_TAIL;
1440 }
1441
1442 static __be32
1443 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1444 struct nfsd4_free_stateid *free_stateid)
1445 {
1446 DECODE_HEAD;
1447
1448 READ_BUF(sizeof(stateid_t));
1449 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1450 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1451
1452 DECODE_TAIL;
1453 }
1454
1455 static __be32
1456 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1457 struct nfsd4_sequence *seq)
1458 {
1459 DECODE_HEAD;
1460
1461 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1462 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1463 seq->seqid = be32_to_cpup(p++);
1464 seq->slotid = be32_to_cpup(p++);
1465 seq->maxslots = be32_to_cpup(p++);
1466 seq->cachethis = be32_to_cpup(p++);
1467
1468 DECODE_TAIL;
1469 }
1470
1471 static __be32
1472 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1473 {
1474 int i;
1475 __be32 *p, status;
1476 struct nfsd4_test_stateid_id *stateid;
1477
1478 READ_BUF(4);
1479 test_stateid->ts_num_ids = ntohl(*p++);
1480
1481 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1482
1483 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1484 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1485 if (!stateid) {
1486 status = nfserrno(-ENOMEM);
1487 goto out;
1488 }
1489
1490 defer_free(argp, kfree, stateid);
1491 INIT_LIST_HEAD(&stateid->ts_id_list);
1492 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1493
1494 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1495 if (status)
1496 goto out;
1497 }
1498
1499 status = 0;
1500 out:
1501 return status;
1502 xdr_error:
1503 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1504 status = nfserr_bad_xdr;
1505 goto out;
1506 }
1507
1508 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1509 {
1510 DECODE_HEAD;
1511
1512 READ_BUF(8);
1513 COPYMEM(&dc->clientid, 8);
1514
1515 DECODE_TAIL;
1516 }
1517
1518 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1519 {
1520 DECODE_HEAD;
1521
1522 READ_BUF(4);
1523 rc->rca_one_fs = be32_to_cpup(p++);
1524
1525 DECODE_TAIL;
1526 }
1527
1528 static __be32
1529 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1530 {
1531 return nfs_ok;
1532 }
1533
1534 static __be32
1535 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1536 {
1537 return nfserr_notsupp;
1538 }
1539
1540 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1541
1542 static nfsd4_dec nfsd4_dec_ops[] = {
1543 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1544 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1545 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1546 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1547 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1548 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1549 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1550 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1551 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1552 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1553 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1554 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1555 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1556 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1557 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1558 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1559 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1560 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1561 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1562 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1563 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1564 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1565 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1566 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1567 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1568 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1569 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1570 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1571 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1572 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1573 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1574 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1575 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1576 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1577 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1578 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1579 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1580
1581 /* new operations for NFSv4.1 */
1582 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1583 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1584 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1585 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1586 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1587 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1588 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1589 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1590 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1591 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1592 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1593 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1594 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1595 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1596 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1597 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1598 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1599 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1600 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1601 };
1602
1603 static inline bool
1604 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1605 {
1606 if (op->opnum < FIRST_NFS4_OP)
1607 return false;
1608 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1609 return false;
1610 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1611 return false;
1612 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1613 return false;
1614 return true;
1615 }
1616
1617 static __be32
1618 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1619 {
1620 DECODE_HEAD;
1621 struct nfsd4_op *op;
1622 bool cachethis = false;
1623 int auth_slack= argp->rqstp->rq_auth_slack;
1624 int max_reply = auth_slack + 8; /* opcnt, status */
1625 int readcount = 0;
1626 int readbytes = 0;
1627 int i;
1628
1629 READ_BUF(4);
1630 argp->taglen = be32_to_cpup(p++);
1631 READ_BUF(argp->taglen + 8);
1632 SAVEMEM(argp->tag, argp->taglen);
1633 argp->minorversion = be32_to_cpup(p++);
1634 argp->opcnt = be32_to_cpup(p++);
1635 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1636
1637 if (argp->taglen > NFSD4_MAX_TAGLEN)
1638 goto xdr_error;
1639 if (argp->opcnt > 100)
1640 goto xdr_error;
1641
1642 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1643 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1644 if (!argp->ops) {
1645 argp->ops = argp->iops;
1646 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1647 goto xdr_error;
1648 }
1649 }
1650
1651 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1652 argp->opcnt = 0;
1653
1654 for (i = 0; i < argp->opcnt; i++) {
1655 op = &argp->ops[i];
1656 op->replay = NULL;
1657
1658 READ_BUF(4);
1659 op->opnum = be32_to_cpup(p++);
1660
1661 if (nfsd4_opnum_in_range(argp, op))
1662 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1663 else {
1664 op->opnum = OP_ILLEGAL;
1665 op->status = nfserr_op_illegal;
1666 }
1667 /*
1668 * We'll try to cache the result in the DRC if any one
1669 * op in the compound wants to be cached:
1670 */
1671 cachethis |= nfsd4_cache_this_op(op);
1672
1673 if (op->opnum == OP_READ) {
1674 readcount++;
1675 readbytes += nfsd4_max_reply(argp->rqstp, op);
1676 } else
1677 max_reply += nfsd4_max_reply(argp->rqstp, op);
1678
1679 if (op->status) {
1680 argp->opcnt = i+1;
1681 break;
1682 }
1683 }
1684 /* Sessions make the DRC unnecessary: */
1685 if (argp->minorversion)
1686 cachethis = false;
1687 svc_reserve(argp->rqstp, max_reply + readbytes);
1688 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1689
1690 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1691 argp->rqstp->rq_splice_ok = false;
1692
1693 DECODE_TAIL;
1694 }
1695
1696 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1697 {
1698 if (IS_I_VERSION(inode)) {
1699 p = xdr_encode_hyper(p, inode->i_version);
1700 } else {
1701 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1702 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1703 }
1704 return p;
1705 }
1706
1707 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1708 {
1709 *p++ = cpu_to_be32(c->atomic);
1710 if (c->change_supported) {
1711 p = xdr_encode_hyper(p, c->before_change);
1712 p = xdr_encode_hyper(p, c->after_change);
1713 } else {
1714 *p++ = cpu_to_be32(c->before_ctime_sec);
1715 *p++ = cpu_to_be32(c->before_ctime_nsec);
1716 *p++ = cpu_to_be32(c->after_ctime_sec);
1717 *p++ = cpu_to_be32(c->after_ctime_nsec);
1718 }
1719 return p;
1720 }
1721
1722 /* Encode as an array of strings the string given with components
1723 * separated @sep, escaped with esc_enter and esc_exit.
1724 */
1725 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1726 char *components, char esc_enter,
1727 char esc_exit)
1728 {
1729 __be32 *p;
1730 __be32 pathlen;
1731 int pathlen_offset;
1732 int strlen, count=0;
1733 char *str, *end, *next;
1734
1735 dprintk("nfsd4_encode_components(%s)\n", components);
1736
1737 pathlen_offset = xdr->buf->len;
1738 p = xdr_reserve_space(xdr, 4);
1739 if (!p)
1740 return nfserr_resource;
1741 p++; /* We will fill this in with @count later */
1742
1743 end = str = components;
1744 while (*end) {
1745 bool found_esc = false;
1746
1747 /* try to parse as esc_start, ..., esc_end, sep */
1748 if (*str == esc_enter) {
1749 for (; *end && (*end != esc_exit); end++)
1750 /* find esc_exit or end of string */;
1751 next = end + 1;
1752 if (*end && (!*next || *next == sep)) {
1753 str++;
1754 found_esc = true;
1755 }
1756 }
1757
1758 if (!found_esc)
1759 for (; *end && (*end != sep); end++)
1760 /* find sep or end of string */;
1761
1762 strlen = end - str;
1763 if (strlen) {
1764 p = xdr_reserve_space(xdr, strlen + 4);
1765 if (!p)
1766 return nfserr_resource;
1767 p = xdr_encode_opaque(p, str, strlen);
1768 count++;
1769 }
1770 else
1771 end++;
1772 str = end;
1773 }
1774 pathlen = htonl(xdr->buf->len - pathlen_offset);
1775 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1776 return 0;
1777 }
1778
1779 /* Encode as an array of strings the string given with components
1780 * separated @sep.
1781 */
1782 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1783 char *components)
1784 {
1785 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1786 }
1787
1788 /*
1789 * encode a location element of a fs_locations structure
1790 */
1791 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1792 struct nfsd4_fs_location *location)
1793 {
1794 __be32 status;
1795
1796 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1797 '[', ']');
1798 if (status)
1799 return status;
1800 status = nfsd4_encode_components(xdr, '/', location->path);
1801 if (status)
1802 return status;
1803 return 0;
1804 }
1805
1806 /*
1807 * Encode a path in RFC3530 'pathname4' format
1808 */
1809 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
1810 const struct path *root,
1811 const struct path *path)
1812 {
1813 struct path cur = *path;
1814 __be32 *p;
1815 struct dentry **components = NULL;
1816 unsigned int ncomponents = 0;
1817 __be32 err = nfserr_jukebox;
1818
1819 dprintk("nfsd4_encode_components(");
1820
1821 path_get(&cur);
1822 /* First walk the path up to the nfsd root, and store the
1823 * dentries/path components in an array.
1824 */
1825 for (;;) {
1826 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1827 break;
1828 if (cur.dentry == cur.mnt->mnt_root) {
1829 if (follow_up(&cur))
1830 continue;
1831 goto out_free;
1832 }
1833 if ((ncomponents & 15) == 0) {
1834 struct dentry **new;
1835 new = krealloc(components,
1836 sizeof(*new) * (ncomponents + 16),
1837 GFP_KERNEL);
1838 if (!new)
1839 goto out_free;
1840 components = new;
1841 }
1842 components[ncomponents++] = cur.dentry;
1843 cur.dentry = dget_parent(cur.dentry);
1844 }
1845 err = nfserr_resource;
1846 p = xdr_reserve_space(xdr, 4);
1847 if (!p)
1848 goto out_free;
1849 *p++ = cpu_to_be32(ncomponents);
1850
1851 while (ncomponents) {
1852 struct dentry *dentry = components[ncomponents - 1];
1853 unsigned int len;
1854
1855 spin_lock(&dentry->d_lock);
1856 len = dentry->d_name.len;
1857 p = xdr_reserve_space(xdr, len + 4);
1858 if (!p) {
1859 spin_unlock(&dentry->d_lock);
1860 goto out_free;
1861 }
1862 p = xdr_encode_opaque(p, dentry->d_name.name, len);
1863 dprintk("/%s", dentry->d_name.name);
1864 spin_unlock(&dentry->d_lock);
1865 dput(dentry);
1866 ncomponents--;
1867 }
1868
1869 err = 0;
1870 out_free:
1871 dprintk(")\n");
1872 while (ncomponents)
1873 dput(components[--ncomponents]);
1874 kfree(components);
1875 path_put(&cur);
1876 return err;
1877 }
1878
1879 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
1880 struct svc_rqst *rqstp, const struct path *path)
1881 {
1882 struct svc_export *exp_ps;
1883 __be32 res;
1884
1885 exp_ps = rqst_find_fsidzero_export(rqstp);
1886 if (IS_ERR(exp_ps))
1887 return nfserrno(PTR_ERR(exp_ps));
1888 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
1889 exp_put(exp_ps);
1890 return res;
1891 }
1892
1893 /*
1894 * encode a fs_locations structure
1895 */
1896 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
1897 struct svc_rqst *rqstp, struct svc_export *exp)
1898 {
1899 __be32 status;
1900 int i;
1901 __be32 *p;
1902 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1903
1904 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1905 if (status)
1906 return status;
1907 p = xdr_reserve_space(xdr, 4);
1908 if (!p)
1909 return nfserr_resource;
1910 *p++ = cpu_to_be32(fslocs->locations_count);
1911 for (i=0; i<fslocs->locations_count; i++) {
1912 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1913 if (status)
1914 return status;
1915 }
1916 return 0;
1917 }
1918
1919 static u32 nfs4_file_type(umode_t mode)
1920 {
1921 switch (mode & S_IFMT) {
1922 case S_IFIFO: return NF4FIFO;
1923 case S_IFCHR: return NF4CHR;
1924 case S_IFDIR: return NF4DIR;
1925 case S_IFBLK: return NF4BLK;
1926 case S_IFLNK: return NF4LNK;
1927 case S_IFREG: return NF4REG;
1928 case S_IFSOCK: return NF4SOCK;
1929 default: return NF4BAD;
1930 };
1931 }
1932
1933 static inline __be32
1934 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1935 struct nfs4_ace *ace)
1936 {
1937 if (ace->whotype != NFS4_ACL_WHO_NAMED)
1938 return nfs4_acl_write_who(xdr, ace->whotype);
1939 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1940 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1941 else
1942 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1943 }
1944
1945 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1946 FATTR4_WORD0_RDATTR_ERROR)
1947 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1948
1949 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1950 static inline __be32
1951 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1952 void *context, int len)
1953 {
1954 __be32 *p;
1955
1956 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
1957 if (!p)
1958 return nfserr_resource;
1959
1960 /*
1961 * For now we use a 0 here to indicate the null translation; in
1962 * the future we may place a call to translation code here.
1963 */
1964 *p++ = cpu_to_be32(0); /* lfs */
1965 *p++ = cpu_to_be32(0); /* pi */
1966 p = xdr_encode_opaque(p, context, len);
1967 return 0;
1968 }
1969 #else
1970 static inline __be32
1971 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1972 void *context, int len)
1973 { return 0; }
1974 #endif
1975
1976 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1977 {
1978 /* As per referral draft: */
1979 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1980 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1981 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1982 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1983 *rdattr_err = NFSERR_MOVED;
1984 else
1985 return nfserr_moved;
1986 }
1987 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1988 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1989 return 0;
1990 }
1991
1992
1993 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
1994 {
1995 struct path path = exp->ex_path;
1996 int err;
1997
1998 path_get(&path);
1999 while (follow_up(&path)) {
2000 if (path.dentry != path.mnt->mnt_root)
2001 break;
2002 }
2003 err = vfs_getattr(&path, stat);
2004 path_put(&path);
2005 return err;
2006 }
2007
2008 /*
2009 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2010 * ourselves.
2011 */
2012 static __be32
2013 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2014 struct svc_export *exp,
2015 struct dentry *dentry, u32 *bmval,
2016 struct svc_rqst *rqstp, int ignore_crossmnt)
2017 {
2018 u32 bmval0 = bmval[0];
2019 u32 bmval1 = bmval[1];
2020 u32 bmval2 = bmval[2];
2021 struct kstat stat;
2022 struct svc_fh *tempfh = NULL;
2023 struct kstatfs statfs;
2024 __be32 *p;
2025 int starting_len = xdr->buf->len;
2026 int attrlen_offset;
2027 __be32 attrlen;
2028 u32 dummy;
2029 u64 dummy64;
2030 u32 rdattr_err = 0;
2031 __be32 status;
2032 int err;
2033 int aclsupport = 0;
2034 struct nfs4_acl *acl = NULL;
2035 void *context = NULL;
2036 int contextlen;
2037 bool contextsupport = false;
2038 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2039 u32 minorversion = resp->cstate.minorversion;
2040 struct path path = {
2041 .mnt = exp->ex_path.mnt,
2042 .dentry = dentry,
2043 };
2044 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2045
2046 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2047 BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2048 BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2049 BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2050
2051 if (exp->ex_fslocs.migrated) {
2052 BUG_ON(bmval[2]);
2053 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2054 if (status)
2055 goto out;
2056 }
2057
2058 err = vfs_getattr(&path, &stat);
2059 if (err)
2060 goto out_nfserr;
2061 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2062 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2063 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2064 FATTR4_WORD1_SPACE_TOTAL))) {
2065 err = vfs_statfs(&path, &statfs);
2066 if (err)
2067 goto out_nfserr;
2068 }
2069 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2070 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2071 status = nfserr_jukebox;
2072 if (!tempfh)
2073 goto out;
2074 fh_init(tempfh, NFS4_FHSIZE);
2075 status = fh_compose(tempfh, exp, dentry, NULL);
2076 if (status)
2077 goto out;
2078 fhp = tempfh;
2079 }
2080 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2081 | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2082 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2083 aclsupport = (err == 0);
2084 if (bmval0 & FATTR4_WORD0_ACL) {
2085 if (err == -EOPNOTSUPP)
2086 bmval0 &= ~FATTR4_WORD0_ACL;
2087 else if (err == -EINVAL) {
2088 status = nfserr_attrnotsupp;
2089 goto out;
2090 } else if (err != 0)
2091 goto out_nfserr;
2092 }
2093 }
2094
2095 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2096 if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2097 bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2098 err = security_inode_getsecctx(dentry->d_inode,
2099 &context, &contextlen);
2100 contextsupport = (err == 0);
2101 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2102 if (err == -EOPNOTSUPP)
2103 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2104 else if (err)
2105 goto out_nfserr;
2106 }
2107 }
2108 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2109
2110 if (bmval2) {
2111 p = xdr_reserve_space(xdr, 16);
2112 if (!p)
2113 goto out_resource;
2114 *p++ = cpu_to_be32(3);
2115 *p++ = cpu_to_be32(bmval0);
2116 *p++ = cpu_to_be32(bmval1);
2117 *p++ = cpu_to_be32(bmval2);
2118 } else if (bmval1) {
2119 p = xdr_reserve_space(xdr, 12);
2120 if (!p)
2121 goto out_resource;
2122 *p++ = cpu_to_be32(2);
2123 *p++ = cpu_to_be32(bmval0);
2124 *p++ = cpu_to_be32(bmval1);
2125 } else {
2126 p = xdr_reserve_space(xdr, 8);
2127 if (!p)
2128 goto out_resource;
2129 *p++ = cpu_to_be32(1);
2130 *p++ = cpu_to_be32(bmval0);
2131 }
2132
2133 attrlen_offset = xdr->buf->len;
2134 p = xdr_reserve_space(xdr, 4);
2135 if (!p)
2136 goto out_resource;
2137 p++; /* to be backfilled later */
2138
2139 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2140 u32 word0 = nfsd_suppattrs0(minorversion);
2141 u32 word1 = nfsd_suppattrs1(minorversion);
2142 u32 word2 = nfsd_suppattrs2(minorversion);
2143
2144 if (!aclsupport)
2145 word0 &= ~FATTR4_WORD0_ACL;
2146 if (!contextsupport)
2147 word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2148 if (!word2) {
2149 p = xdr_reserve_space(xdr, 12);
2150 if (!p)
2151 goto out_resource;
2152 *p++ = cpu_to_be32(2);
2153 *p++ = cpu_to_be32(word0);
2154 *p++ = cpu_to_be32(word1);
2155 } else {
2156 p = xdr_reserve_space(xdr, 16);
2157 if (!p)
2158 goto out_resource;
2159 *p++ = cpu_to_be32(3);
2160 *p++ = cpu_to_be32(word0);
2161 *p++ = cpu_to_be32(word1);
2162 *p++ = cpu_to_be32(word2);
2163 }
2164 }
2165 if (bmval0 & FATTR4_WORD0_TYPE) {
2166 p = xdr_reserve_space(xdr, 4);
2167 if (!p)
2168 goto out_resource;
2169 dummy = nfs4_file_type(stat.mode);
2170 if (dummy == NF4BAD) {
2171 status = nfserr_serverfault;
2172 goto out;
2173 }
2174 *p++ = cpu_to_be32(dummy);
2175 }
2176 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2177 p = xdr_reserve_space(xdr, 4);
2178 if (!p)
2179 goto out_resource;
2180 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2181 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2182 else
2183 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2184 NFS4_FH_VOL_RENAME);
2185 }
2186 if (bmval0 & FATTR4_WORD0_CHANGE) {
2187 p = xdr_reserve_space(xdr, 8);
2188 if (!p)
2189 goto out_resource;
2190 p = encode_change(p, &stat, dentry->d_inode);
2191 }
2192 if (bmval0 & FATTR4_WORD0_SIZE) {
2193 p = xdr_reserve_space(xdr, 8);
2194 if (!p)
2195 goto out_resource;
2196 p = xdr_encode_hyper(p, stat.size);
2197 }
2198 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2199 p = xdr_reserve_space(xdr, 4);
2200 if (!p)
2201 goto out_resource;
2202 *p++ = cpu_to_be32(1);
2203 }
2204 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2205 p = xdr_reserve_space(xdr, 4);
2206 if (!p)
2207 goto out_resource;
2208 *p++ = cpu_to_be32(1);
2209 }
2210 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2211 p = xdr_reserve_space(xdr, 4);
2212 if (!p)
2213 goto out_resource;
2214 *p++ = cpu_to_be32(0);
2215 }
2216 if (bmval0 & FATTR4_WORD0_FSID) {
2217 p = xdr_reserve_space(xdr, 16);
2218 if (!p)
2219 goto out_resource;
2220 if (exp->ex_fslocs.migrated) {
2221 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2222 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2223 } else switch(fsid_source(fhp)) {
2224 case FSIDSOURCE_FSID:
2225 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2226 p = xdr_encode_hyper(p, (u64)0);
2227 break;
2228 case FSIDSOURCE_DEV:
2229 *p++ = cpu_to_be32(0);
2230 *p++ = cpu_to_be32(MAJOR(stat.dev));
2231 *p++ = cpu_to_be32(0);
2232 *p++ = cpu_to_be32(MINOR(stat.dev));
2233 break;
2234 case FSIDSOURCE_UUID:
2235 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2236 EX_UUID_LEN);
2237 break;
2238 }
2239 }
2240 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2241 p = xdr_reserve_space(xdr, 4);
2242 if (!p)
2243 goto out_resource;
2244 *p++ = cpu_to_be32(0);
2245 }
2246 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2247 p = xdr_reserve_space(xdr, 4);
2248 if (!p)
2249 goto out_resource;
2250 *p++ = cpu_to_be32(nn->nfsd4_lease);
2251 }
2252 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2253 p = xdr_reserve_space(xdr, 4);
2254 if (!p)
2255 goto out_resource;
2256 *p++ = cpu_to_be32(rdattr_err);
2257 }
2258 if (bmval0 & FATTR4_WORD0_ACL) {
2259 struct nfs4_ace *ace;
2260
2261 if (acl == NULL) {
2262 p = xdr_reserve_space(xdr, 4);
2263 if (!p)
2264 goto out_resource;
2265
2266 *p++ = cpu_to_be32(0);
2267 goto out_acl;
2268 }
2269 p = xdr_reserve_space(xdr, 4);
2270 if (!p)
2271 goto out_resource;
2272 *p++ = cpu_to_be32(acl->naces);
2273
2274 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2275 p = xdr_reserve_space(xdr, 4*3);
2276 if (!p)
2277 goto out_resource;
2278 *p++ = cpu_to_be32(ace->type);
2279 *p++ = cpu_to_be32(ace->flag);
2280 *p++ = cpu_to_be32(ace->access_mask &
2281 NFS4_ACE_MASK_ALL);
2282 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2283 if (status)
2284 goto out;
2285 }
2286 }
2287 out_acl:
2288 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2289 p = xdr_reserve_space(xdr, 4);
2290 if (!p)
2291 goto out_resource;
2292 *p++ = cpu_to_be32(aclsupport ?
2293 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2294 }
2295 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2296 p = xdr_reserve_space(xdr, 4);
2297 if (!p)
2298 goto out_resource;
2299 *p++ = cpu_to_be32(1);
2300 }
2301 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2302 p = xdr_reserve_space(xdr, 4);
2303 if (!p)
2304 goto out_resource;
2305 *p++ = cpu_to_be32(0);
2306 }
2307 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2308 p = xdr_reserve_space(xdr, 4);
2309 if (!p)
2310 goto out_resource;
2311 *p++ = cpu_to_be32(1);
2312 }
2313 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2314 p = xdr_reserve_space(xdr, 4);
2315 if (!p)
2316 goto out_resource;
2317 *p++ = cpu_to_be32(1);
2318 }
2319 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2320 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2321 if (!p)
2322 goto out_resource;
2323 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2324 fhp->fh_handle.fh_size);
2325 }
2326 if (bmval0 & FATTR4_WORD0_FILEID) {
2327 p = xdr_reserve_space(xdr, 8);
2328 if (!p)
2329 goto out_resource;
2330 p = xdr_encode_hyper(p, stat.ino);
2331 }
2332 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2333 p = xdr_reserve_space(xdr, 8);
2334 if (!p)
2335 goto out_resource;
2336 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2337 }
2338 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2339 p = xdr_reserve_space(xdr, 8);
2340 if (!p)
2341 goto out_resource;
2342 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2343 }
2344 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2345 p = xdr_reserve_space(xdr, 8);
2346 if (!p)
2347 goto out_resource;
2348 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2349 }
2350 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2351 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2352 if (status)
2353 goto out;
2354 }
2355 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2356 p = xdr_reserve_space(xdr, 4);
2357 if (!p)
2358 goto out_resource;
2359 *p++ = cpu_to_be32(1);
2360 }
2361 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2362 p = xdr_reserve_space(xdr, 8);
2363 if (!p)
2364 goto out_resource;
2365 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2366 }
2367 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2368 p = xdr_reserve_space(xdr, 4);
2369 if (!p)
2370 goto out_resource;
2371 *p++ = cpu_to_be32(255);
2372 }
2373 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2374 p = xdr_reserve_space(xdr, 4);
2375 if (!p)
2376 goto out_resource;
2377 *p++ = cpu_to_be32(statfs.f_namelen);
2378 }
2379 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2380 p = xdr_reserve_space(xdr, 8);
2381 if (!p)
2382 goto out_resource;
2383 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2384 }
2385 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2386 p = xdr_reserve_space(xdr, 8);
2387 if (!p)
2388 goto out_resource;
2389 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2390 }
2391 if (bmval1 & FATTR4_WORD1_MODE) {
2392 p = xdr_reserve_space(xdr, 4);
2393 if (!p)
2394 goto out_resource;
2395 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2396 }
2397 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2398 p = xdr_reserve_space(xdr, 4);
2399 if (!p)
2400 goto out_resource;
2401 *p++ = cpu_to_be32(1);
2402 }
2403 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2404 p = xdr_reserve_space(xdr, 4);
2405 if (!p)
2406 goto out_resource;
2407 *p++ = cpu_to_be32(stat.nlink);
2408 }
2409 if (bmval1 & FATTR4_WORD1_OWNER) {
2410 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2411 if (status)
2412 goto out;
2413 }
2414 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2415 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2416 if (status)
2417 goto out;
2418 }
2419 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2420 p = xdr_reserve_space(xdr, 8);
2421 if (!p)
2422 goto out_resource;
2423 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2424 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2425 }
2426 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2427 p = xdr_reserve_space(xdr, 8);
2428 if (!p)
2429 goto out_resource;
2430 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2431 p = xdr_encode_hyper(p, dummy64);
2432 }
2433 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2434 p = xdr_reserve_space(xdr, 8);
2435 if (!p)
2436 goto out_resource;
2437 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2438 p = xdr_encode_hyper(p, dummy64);
2439 }
2440 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2441 p = xdr_reserve_space(xdr, 8);
2442 if (!p)
2443 goto out_resource;
2444 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2445 p = xdr_encode_hyper(p, dummy64);
2446 }
2447 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2448 p = xdr_reserve_space(xdr, 8);
2449 if (!p)
2450 goto out_resource;
2451 dummy64 = (u64)stat.blocks << 9;
2452 p = xdr_encode_hyper(p, dummy64);
2453 }
2454 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2455 p = xdr_reserve_space(xdr, 12);
2456 if (!p)
2457 goto out_resource;
2458 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2459 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2460 }
2461 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2462 p = xdr_reserve_space(xdr, 12);
2463 if (!p)
2464 goto out_resource;
2465 *p++ = cpu_to_be32(0);
2466 *p++ = cpu_to_be32(1);
2467 *p++ = cpu_to_be32(0);
2468 }
2469 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2470 p = xdr_reserve_space(xdr, 12);
2471 if (!p)
2472 goto out_resource;
2473 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2474 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2475 }
2476 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2477 p = xdr_reserve_space(xdr, 12);
2478 if (!p)
2479 goto out_resource;
2480 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2481 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2482 }
2483 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2484 p = xdr_reserve_space(xdr, 8);
2485 if (!p)
2486 goto out_resource;
2487 /*
2488 * Get parent's attributes if not ignoring crossmount
2489 * and this is the root of a cross-mounted filesystem.
2490 */
2491 if (ignore_crossmnt == 0 &&
2492 dentry == exp->ex_path.mnt->mnt_root)
2493 get_parent_attributes(exp, &stat);
2494 p = xdr_encode_hyper(p, stat.ino);
2495 }
2496 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2497 status = nfsd4_encode_security_label(xdr, rqstp, context,
2498 contextlen);
2499 if (status)
2500 goto out;
2501 }
2502 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2503 p = xdr_reserve_space(xdr, 16);
2504 if (!p)
2505 goto out_resource;
2506 *p++ = cpu_to_be32(3);
2507 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2508 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2509 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2510 }
2511
2512 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2513 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2514 status = nfs_ok;
2515
2516 out:
2517 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2518 if (context)
2519 security_release_secctx(context, contextlen);
2520 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2521 kfree(acl);
2522 if (tempfh) {
2523 fh_put(tempfh);
2524 kfree(tempfh);
2525 }
2526 if (status)
2527 xdr_truncate_encode(xdr, starting_len);
2528 return status;
2529 out_nfserr:
2530 status = nfserrno(err);
2531 goto out;
2532 out_resource:
2533 status = nfserr_resource;
2534 goto out;
2535 }
2536
2537 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2538 struct xdr_buf *buf, __be32 *p, int bytes)
2539 {
2540 xdr->scratch.iov_len = 0;
2541 memset(buf, 0, sizeof(struct xdr_buf));
2542 buf->head[0].iov_base = p;
2543 buf->head[0].iov_len = 0;
2544 buf->len = 0;
2545 xdr->buf = buf;
2546 xdr->iov = buf->head;
2547 xdr->p = p;
2548 xdr->end = (void *)p + bytes;
2549 buf->buflen = bytes;
2550 }
2551
2552 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2553 struct svc_fh *fhp, struct svc_export *exp,
2554 struct dentry *dentry, u32 *bmval,
2555 struct svc_rqst *rqstp, int ignore_crossmnt)
2556 {
2557 struct xdr_buf dummy;
2558 struct xdr_stream xdr;
2559 __be32 ret;
2560
2561 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2562 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2563 ignore_crossmnt);
2564 *p = xdr.p;
2565 return ret;
2566 }
2567
2568 static inline int attributes_need_mount(u32 *bmval)
2569 {
2570 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2571 return 1;
2572 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2573 return 1;
2574 return 0;
2575 }
2576
2577 static __be32
2578 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2579 const char *name, int namlen)
2580 {
2581 struct svc_export *exp = cd->rd_fhp->fh_export;
2582 struct dentry *dentry;
2583 __be32 nfserr;
2584 int ignore_crossmnt = 0;
2585
2586 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2587 if (IS_ERR(dentry))
2588 return nfserrno(PTR_ERR(dentry));
2589 if (!dentry->d_inode) {
2590 /*
2591 * nfsd_buffered_readdir drops the i_mutex between
2592 * readdir and calling this callback, leaving a window
2593 * where this directory entry could have gone away.
2594 */
2595 dput(dentry);
2596 return nfserr_noent;
2597 }
2598
2599 exp_get(exp);
2600 /*
2601 * In the case of a mountpoint, the client may be asking for
2602 * attributes that are only properties of the underlying filesystem
2603 * as opposed to the cross-mounted file system. In such a case,
2604 * we will not follow the cross mount and will fill the attribtutes
2605 * directly from the mountpoint dentry.
2606 */
2607 if (nfsd_mountpoint(dentry, exp)) {
2608 int err;
2609
2610 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2611 && !attributes_need_mount(cd->rd_bmval)) {
2612 ignore_crossmnt = 1;
2613 goto out_encode;
2614 }
2615 /*
2616 * Why the heck aren't we just using nfsd_lookup??
2617 * Different "."/".." handling? Something else?
2618 * At least, add a comment here to explain....
2619 */
2620 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2621 if (err) {
2622 nfserr = nfserrno(err);
2623 goto out_put;
2624 }
2625 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2626 if (nfserr)
2627 goto out_put;
2628
2629 }
2630 out_encode:
2631 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2632 cd->rd_rqstp, ignore_crossmnt);
2633 out_put:
2634 dput(dentry);
2635 exp_put(exp);
2636 return nfserr;
2637 }
2638
2639 static __be32 *
2640 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2641 {
2642 __be32 *p;
2643
2644 p = xdr_reserve_space(xdr, 20);
2645 if (!p)
2646 return NULL;
2647 *p++ = htonl(2);
2648 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2649 *p++ = htonl(0); /* bmval1 */
2650
2651 *p++ = htonl(4); /* attribute length */
2652 *p++ = nfserr; /* no htonl */
2653 return p;
2654 }
2655
2656 static int
2657 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2658 loff_t offset, u64 ino, unsigned int d_type)
2659 {
2660 struct readdir_cd *ccd = ccdv;
2661 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2662 struct xdr_stream *xdr = cd->xdr;
2663 int start_offset = xdr->buf->len;
2664 int cookie_offset;
2665 int entry_bytes;
2666 __be32 nfserr = nfserr_toosmall;
2667 __be64 wire_offset;
2668 __be32 *p;
2669
2670 /* In nfsv4, "." and ".." never make it onto the wire.. */
2671 if (name && isdotent(name, namlen)) {
2672 cd->common.err = nfs_ok;
2673 return 0;
2674 }
2675
2676 if (cd->cookie_offset) {
2677 wire_offset = cpu_to_be64(offset);
2678 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2679 &wire_offset, 8);
2680 }
2681
2682 p = xdr_reserve_space(xdr, 4);
2683 if (!p)
2684 goto fail;
2685 *p++ = xdr_one; /* mark entry present */
2686 cookie_offset = xdr->buf->len;
2687 p = xdr_reserve_space(xdr, 3*4 + namlen);
2688 if (!p)
2689 goto fail;
2690 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
2691 p = xdr_encode_array(p, name, namlen); /* name length & name */
2692
2693 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2694 switch (nfserr) {
2695 case nfs_ok:
2696 break;
2697 case nfserr_resource:
2698 nfserr = nfserr_toosmall;
2699 goto fail;
2700 case nfserr_noent:
2701 xdr_truncate_encode(xdr, start_offset);
2702 goto skip_entry;
2703 default:
2704 /*
2705 * If the client requested the RDATTR_ERROR attribute,
2706 * we stuff the error code into this attribute
2707 * and continue. If this attribute was not requested,
2708 * then in accordance with the spec, we fail the
2709 * entire READDIR operation(!)
2710 */
2711 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2712 goto fail;
2713 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2714 if (p == NULL) {
2715 nfserr = nfserr_toosmall;
2716 goto fail;
2717 }
2718 }
2719 nfserr = nfserr_toosmall;
2720 entry_bytes = xdr->buf->len - start_offset;
2721 if (entry_bytes > cd->rd_maxcount)
2722 goto fail;
2723 cd->rd_maxcount -= entry_bytes;
2724 if (!cd->rd_dircount)
2725 goto fail;
2726 cd->rd_dircount--;
2727 cd->cookie_offset = cookie_offset;
2728 skip_entry:
2729 cd->common.err = nfs_ok;
2730 return 0;
2731 fail:
2732 xdr_truncate_encode(xdr, start_offset);
2733 cd->common.err = nfserr;
2734 return -EINVAL;
2735 }
2736
2737 static __be32
2738 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2739 {
2740 __be32 *p;
2741
2742 p = xdr_reserve_space(xdr, sizeof(stateid_t));
2743 if (!p)
2744 return nfserr_resource;
2745 *p++ = cpu_to_be32(sid->si_generation);
2746 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
2747 sizeof(stateid_opaque_t));
2748 return 0;
2749 }
2750
2751 static __be32
2752 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2753 {
2754 struct xdr_stream *xdr = &resp->xdr;
2755 __be32 *p;
2756
2757 if (!nfserr) {
2758 p = xdr_reserve_space(xdr, 8);
2759 if (!p)
2760 return nfserr_resource;
2761 *p++ = cpu_to_be32(access->ac_supported);
2762 *p++ = cpu_to_be32(access->ac_resp_access);
2763 }
2764 return nfserr;
2765 }
2766
2767 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2768 {
2769 struct xdr_stream *xdr = &resp->xdr;
2770 __be32 *p;
2771
2772 if (!nfserr) {
2773 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
2774 if (!p)
2775 return nfserr_resource;
2776 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
2777 NFS4_MAX_SESSIONID_LEN);
2778 *p++ = cpu_to_be32(bcts->dir);
2779 /* Sorry, we do not yet support RDMA over 4.1: */
2780 *p++ = cpu_to_be32(0);
2781 }
2782 return nfserr;
2783 }
2784
2785 static __be32
2786 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2787 {
2788 struct xdr_stream *xdr = &resp->xdr;
2789
2790 if (!nfserr)
2791 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2792
2793 return nfserr;
2794 }
2795
2796
2797 static __be32
2798 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2799 {
2800 struct xdr_stream *xdr = &resp->xdr;
2801 __be32 *p;
2802
2803 if (!nfserr) {
2804 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
2805 if (!p)
2806 return nfserr_resource;
2807 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
2808 NFS4_VERIFIER_SIZE);
2809 }
2810 return nfserr;
2811 }
2812
2813 static __be32
2814 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2815 {
2816 struct xdr_stream *xdr = &resp->xdr;
2817 __be32 *p;
2818
2819 if (!nfserr) {
2820 p = xdr_reserve_space(xdr, 32);
2821 if (!p)
2822 return nfserr_resource;
2823 p = encode_cinfo(p, &create->cr_cinfo);
2824 *p++ = cpu_to_be32(2);
2825 *p++ = cpu_to_be32(create->cr_bmval[0]);
2826 *p++ = cpu_to_be32(create->cr_bmval[1]);
2827 }
2828 return nfserr;
2829 }
2830
2831 static __be32
2832 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2833 {
2834 struct svc_fh *fhp = getattr->ga_fhp;
2835 struct xdr_stream *xdr = &resp->xdr;
2836
2837 if (nfserr)
2838 return nfserr;
2839
2840 nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
2841 getattr->ga_bmval,
2842 resp->rqstp, 0);
2843 return nfserr;
2844 }
2845
2846 static __be32
2847 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2848 {
2849 struct xdr_stream *xdr = &resp->xdr;
2850 struct svc_fh *fhp = *fhpp;
2851 unsigned int len;
2852 __be32 *p;
2853
2854 if (!nfserr) {
2855 len = fhp->fh_handle.fh_size;
2856 p = xdr_reserve_space(xdr, len + 4);
2857 if (!p)
2858 return nfserr_resource;
2859 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
2860 }
2861 return nfserr;
2862 }
2863
2864 /*
2865 * Including all fields other than the name, a LOCK4denied structure requires
2866 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2867 */
2868 static __be32
2869 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
2870 {
2871 struct xdr_netobj *conf = &ld->ld_owner;
2872 __be32 *p;
2873
2874 again:
2875 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2876 if (!p) {
2877 /*
2878 * Don't fail to return the result just because we can't
2879 * return the conflicting open:
2880 */
2881 if (conf->len) {
2882 kfree(conf->data);
2883 conf->len = 0;
2884 conf->data = NULL;
2885 goto again;
2886 }
2887 return nfserr_resource;
2888 }
2889 p = xdr_encode_hyper(p, ld->ld_start);
2890 p = xdr_encode_hyper(p, ld->ld_length);
2891 *p++ = cpu_to_be32(ld->ld_type);
2892 if (conf->len) {
2893 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
2894 p = xdr_encode_opaque(p, conf->data, conf->len);
2895 kfree(conf->data);
2896 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
2897 p = xdr_encode_hyper(p, (u64)0); /* clientid */
2898 *p++ = cpu_to_be32(0); /* length of owner name */
2899 }
2900 return nfserr_denied;
2901 }
2902
2903 static __be32
2904 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2905 {
2906 struct xdr_stream *xdr = &resp->xdr;
2907
2908 if (!nfserr)
2909 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2910 else if (nfserr == nfserr_denied)
2911 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2912
2913 return nfserr;
2914 }
2915
2916 static __be32
2917 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2918 {
2919 struct xdr_stream *xdr = &resp->xdr;
2920
2921 if (nfserr == nfserr_denied)
2922 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2923 return nfserr;
2924 }
2925
2926 static __be32
2927 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2928 {
2929 struct xdr_stream *xdr = &resp->xdr;
2930
2931 if (!nfserr)
2932 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2933
2934 return nfserr;
2935 }
2936
2937
2938 static __be32
2939 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2940 {
2941 struct xdr_stream *xdr = &resp->xdr;
2942 __be32 *p;
2943
2944 if (!nfserr) {
2945 p = xdr_reserve_space(xdr, 20);
2946 if (!p)
2947 return nfserr_resource;
2948 p = encode_cinfo(p, &link->li_cinfo);
2949 }
2950 return nfserr;
2951 }
2952
2953
2954 static __be32
2955 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2956 {
2957 struct xdr_stream *xdr = &resp->xdr;
2958 __be32 *p;
2959
2960 if (nfserr)
2961 goto out;
2962
2963 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
2964 if (nfserr)
2965 goto out;
2966 p = xdr_reserve_space(xdr, 40);
2967 if (!p)
2968 return nfserr_resource;
2969 p = encode_cinfo(p, &open->op_cinfo);
2970 *p++ = cpu_to_be32(open->op_rflags);
2971 *p++ = cpu_to_be32(2);
2972 *p++ = cpu_to_be32(open->op_bmval[0]);
2973 *p++ = cpu_to_be32(open->op_bmval[1]);
2974 *p++ = cpu_to_be32(open->op_delegate_type);
2975
2976 switch (open->op_delegate_type) {
2977 case NFS4_OPEN_DELEGATE_NONE:
2978 break;
2979 case NFS4_OPEN_DELEGATE_READ:
2980 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
2981 if (nfserr)
2982 return nfserr;
2983 p = xdr_reserve_space(xdr, 20);
2984 if (!p)
2985 return nfserr_resource;
2986 *p++ = cpu_to_be32(open->op_recall);
2987
2988 /*
2989 * TODO: ACE's in delegations
2990 */
2991 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2992 *p++ = cpu_to_be32(0);
2993 *p++ = cpu_to_be32(0);
2994 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
2995 break;
2996 case NFS4_OPEN_DELEGATE_WRITE:
2997 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
2998 if (nfserr)
2999 return nfserr;
3000 p = xdr_reserve_space(xdr, 32);
3001 if (!p)
3002 return nfserr_resource;
3003 *p++ = cpu_to_be32(0);
3004
3005 /*
3006 * TODO: space_limit's in delegations
3007 */
3008 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3009 *p++ = cpu_to_be32(~(u32)0);
3010 *p++ = cpu_to_be32(~(u32)0);
3011
3012 /*
3013 * TODO: ACE's in delegations
3014 */
3015 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3016 *p++ = cpu_to_be32(0);
3017 *p++ = cpu_to_be32(0);
3018 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3019 break;
3020 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3021 switch (open->op_why_no_deleg) {
3022 case WND4_CONTENTION:
3023 case WND4_RESOURCE:
3024 p = xdr_reserve_space(xdr, 8);
3025 if (!p)
3026 return nfserr_resource;
3027 *p++ = cpu_to_be32(open->op_why_no_deleg);
3028 /* deleg signaling not supported yet: */
3029 *p++ = cpu_to_be32(0);
3030 break;
3031 default:
3032 p = xdr_reserve_space(xdr, 4);
3033 if (!p)
3034 return nfserr_resource;
3035 *p++ = cpu_to_be32(open->op_why_no_deleg);
3036 }
3037 break;
3038 default:
3039 BUG();
3040 }
3041 /* XXX save filehandle here */
3042 out:
3043 return nfserr;
3044 }
3045
3046 static __be32
3047 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3048 {
3049 struct xdr_stream *xdr = &resp->xdr;
3050
3051 if (!nfserr)
3052 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3053
3054 return nfserr;
3055 }
3056
3057 static __be32
3058 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3059 {
3060 struct xdr_stream *xdr = &resp->xdr;
3061
3062 if (!nfserr)
3063 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3064
3065 return nfserr;
3066 }
3067
3068 static __be32 nfsd4_encode_splice_read(
3069 struct nfsd4_compoundres *resp,
3070 struct nfsd4_read *read,
3071 struct file *file, unsigned long maxcount)
3072 {
3073 struct xdr_stream *xdr = &resp->xdr;
3074 struct xdr_buf *buf = xdr->buf;
3075 u32 eof;
3076 int space_left;
3077 __be32 nfserr;
3078 __be32 *p = xdr->p - 2;
3079
3080 /*
3081 * Don't inline pages unless we know there's room for eof,
3082 * count, and possible padding:
3083 */
3084 if (xdr->end - xdr->p < 3)
3085 return nfserr_resource;
3086
3087 nfserr = nfsd_splice_read(read->rd_rqstp, file,
3088 read->rd_offset, &maxcount);
3089 if (nfserr) {
3090 /*
3091 * nfsd_splice_actor may have already messed with the
3092 * page length; reset it so as not to confuse
3093 * xdr_truncate_encode:
3094 */
3095 buf->page_len = 0;
3096 return nfserr;
3097 }
3098
3099 eof = (read->rd_offset + maxcount >=
3100 read->rd_fhp->fh_dentry->d_inode->i_size);
3101
3102 *(p++) = htonl(eof);
3103 *(p++) = htonl(maxcount);
3104
3105 buf->page_len = maxcount;
3106 buf->len += maxcount;
3107 xdr->page_ptr += (maxcount + PAGE_SIZE - 1) / PAGE_SIZE;
3108
3109 /* Use rest of head for padding and remaining ops: */
3110 buf->tail[0].iov_base = xdr->p;
3111 buf->tail[0].iov_len = 0;
3112 xdr->iov = buf->tail;
3113 if (maxcount&3) {
3114 int pad = 4 - (maxcount&3);
3115
3116 *(xdr->p++) = 0;
3117
3118 buf->tail[0].iov_base += maxcount&3;
3119 buf->tail[0].iov_len = pad;
3120 buf->len += pad;
3121 }
3122
3123 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3124 buf->buflen - buf->len);
3125 buf->buflen = buf->len + space_left;
3126 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3127
3128 return 0;
3129 }
3130
3131 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3132 struct nfsd4_read *read,
3133 struct file *file, unsigned long maxcount)
3134 {
3135 struct xdr_stream *xdr = &resp->xdr;
3136 u32 eof;
3137 int v;
3138 int starting_len = xdr->buf->len - 8;
3139 long len;
3140 int thislen;
3141 __be32 nfserr;
3142 __be32 tmp;
3143 __be32 *p;
3144 u32 zzz = 0;
3145 int pad;
3146
3147 len = maxcount;
3148 v = 0;
3149
3150 thislen = (void *)xdr->end - (void *)xdr->p;
3151 if (len < thislen)
3152 thislen = len;
3153 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3154 WARN_ON_ONCE(!p);
3155 resp->rqstp->rq_vec[v].iov_base = p;
3156 resp->rqstp->rq_vec[v].iov_len = thislen;
3157 v++;
3158 len -= thislen;
3159
3160 while (len) {
3161 thislen = min_t(long, len, PAGE_SIZE);
3162 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3163 WARN_ON_ONCE(!p);
3164 resp->rqstp->rq_vec[v].iov_base = p;
3165 resp->rqstp->rq_vec[v].iov_len = thislen;
3166 v++;
3167 len -= thislen;
3168 }
3169 read->rd_vlen = v;
3170
3171 nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3172 read->rd_vlen, &maxcount);
3173 if (nfserr)
3174 return nfserr;
3175 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3176
3177 eof = (read->rd_offset + maxcount >=
3178 read->rd_fhp->fh_dentry->d_inode->i_size);
3179
3180 tmp = htonl(eof);
3181 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3182 tmp = htonl(maxcount);
3183 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3184
3185 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3186 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3187 &zzz, pad);
3188 return 0;
3189
3190 }
3191
3192 static __be32
3193 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3194 struct nfsd4_read *read)
3195 {
3196 unsigned long maxcount;
3197 struct xdr_stream *xdr = &resp->xdr;
3198 struct file *file = read->rd_filp;
3199 int starting_len = xdr->buf->len;
3200 struct raparms *ra;
3201 __be32 *p;
3202 __be32 err;
3203
3204 if (nfserr)
3205 return nfserr;
3206
3207 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3208 if (!p) {
3209 WARN_ON_ONCE(resp->rqstp->rq_splice_ok);
3210 return nfserr_resource;
3211 }
3212 if (resp->xdr.buf->page_len && resp->rqstp->rq_splice_ok) {
3213 WARN_ON_ONCE(1);
3214 return nfserr_resource;
3215 }
3216 xdr_commit_encode(xdr);
3217
3218 maxcount = svc_max_payload(resp->rqstp);
3219 if (maxcount > xdr->buf->buflen - xdr->buf->len)
3220 maxcount = xdr->buf->buflen - xdr->buf->len;
3221 if (maxcount > read->rd_length)
3222 maxcount = read->rd_length;
3223
3224 if (!read->rd_filp) {
3225 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
3226 &file, &ra);
3227 if (err)
3228 goto err_truncate;
3229 }
3230
3231 if (file->f_op->splice_read && resp->rqstp->rq_splice_ok)
3232 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
3233 else
3234 err = nfsd4_encode_readv(resp, read, file, maxcount);
3235
3236 if (!read->rd_filp)
3237 nfsd_put_tmp_read_open(file, ra);
3238
3239 err_truncate:
3240 if (err)
3241 xdr_truncate_encode(xdr, starting_len);
3242 return err;
3243 }
3244
3245 static __be32
3246 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3247 {
3248 int maxcount;
3249 __be32 wire_count;
3250 int zero = 0;
3251 struct xdr_stream *xdr = &resp->xdr;
3252 int length_offset = xdr->buf->len;
3253 __be32 *p;
3254
3255 if (nfserr)
3256 return nfserr;
3257
3258 p = xdr_reserve_space(xdr, 4);
3259 if (!p)
3260 return nfserr_resource;
3261 maxcount = PAGE_SIZE;
3262
3263 p = xdr_reserve_space(xdr, maxcount);
3264 if (!p)
3265 return nfserr_resource;
3266 /*
3267 * XXX: By default, the ->readlink() VFS op will truncate symlinks
3268 * if they would overflow the buffer. Is this kosher in NFSv4? If
3269 * not, one easy fix is: if ->readlink() precisely fills the buffer,
3270 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3271 */
3272 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3273 (char *)p, &maxcount);
3274 if (nfserr == nfserr_isdir)
3275 nfserr = nfserr_inval;
3276 if (nfserr) {
3277 xdr_truncate_encode(xdr, length_offset);
3278 return nfserr;
3279 }
3280
3281 wire_count = htonl(maxcount);
3282 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3283 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3284 if (maxcount & 3)
3285 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3286 &zero, 4 - (maxcount&3));
3287 return 0;
3288 }
3289
3290 static __be32
3291 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3292 {
3293 int maxcount;
3294 int bytes_left;
3295 loff_t offset;
3296 __be64 wire_offset;
3297 struct xdr_stream *xdr = &resp->xdr;
3298 int starting_len = xdr->buf->len;
3299 __be32 *p;
3300
3301 if (nfserr)
3302 return nfserr;
3303
3304 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3305 if (!p)
3306 return nfserr_resource;
3307
3308 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3309 *p++ = cpu_to_be32(0);
3310 *p++ = cpu_to_be32(0);
3311 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3312 - (char *)resp->xdr.buf->head[0].iov_base;
3313
3314 /*
3315 * Number of bytes left for directory entries allowing for the
3316 * final 8 bytes of the readdir and a following failed op:
3317 */
3318 bytes_left = xdr->buf->buflen - xdr->buf->len
3319 - COMPOUND_ERR_SLACK_SPACE - 8;
3320 if (bytes_left < 0) {
3321 nfserr = nfserr_resource;
3322 goto err_no_verf;
3323 }
3324 maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3325 /*
3326 * Note the rfc defines rd_maxcount as the size of the
3327 * READDIR4resok structure, which includes the verifier above
3328 * and the 8 bytes encoded at the end of this function:
3329 */
3330 if (maxcount < 16) {
3331 nfserr = nfserr_toosmall;
3332 goto err_no_verf;
3333 }
3334 maxcount = min_t(int, maxcount-16, bytes_left);
3335
3336 readdir->xdr = xdr;
3337 readdir->rd_maxcount = maxcount;
3338 readdir->common.err = 0;
3339 readdir->cookie_offset = 0;
3340
3341 offset = readdir->rd_cookie;
3342 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3343 &offset,
3344 &readdir->common, nfsd4_encode_dirent);
3345 if (nfserr == nfs_ok &&
3346 readdir->common.err == nfserr_toosmall &&
3347 xdr->buf->len == starting_len + 8) {
3348 /* nothing encoded; which limit did we hit?: */
3349 if (maxcount - 16 < bytes_left)
3350 /* It was the fault of rd_maxcount: */
3351 nfserr = nfserr_toosmall;
3352 else
3353 /* We ran out of buffer space: */
3354 nfserr = nfserr_resource;
3355 }
3356 if (nfserr)
3357 goto err_no_verf;
3358
3359 if (readdir->cookie_offset) {
3360 wire_offset = cpu_to_be64(offset);
3361 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3362 &wire_offset, 8);
3363 }
3364
3365 p = xdr_reserve_space(xdr, 8);
3366 if (!p) {
3367 WARN_ON_ONCE(1);
3368 goto err_no_verf;
3369 }
3370 *p++ = 0; /* no more entries */
3371 *p++ = htonl(readdir->common.err == nfserr_eof);
3372
3373 return 0;
3374 err_no_verf:
3375 xdr_truncate_encode(xdr, starting_len);
3376 return nfserr;
3377 }
3378
3379 static __be32
3380 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3381 {
3382 struct xdr_stream *xdr = &resp->xdr;
3383 __be32 *p;
3384
3385 if (!nfserr) {
3386 p = xdr_reserve_space(xdr, 20);
3387 if (!p)
3388 return nfserr_resource;
3389 p = encode_cinfo(p, &remove->rm_cinfo);
3390 }
3391 return nfserr;
3392 }
3393
3394 static __be32
3395 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3396 {
3397 struct xdr_stream *xdr = &resp->xdr;
3398 __be32 *p;
3399
3400 if (!nfserr) {
3401 p = xdr_reserve_space(xdr, 40);
3402 if (!p)
3403 return nfserr_resource;
3404 p = encode_cinfo(p, &rename->rn_sinfo);
3405 p = encode_cinfo(p, &rename->rn_tinfo);
3406 }
3407 return nfserr;
3408 }
3409
3410 static __be32
3411 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3412 __be32 nfserr, struct svc_export *exp)
3413 {
3414 u32 i, nflavs, supported;
3415 struct exp_flavor_info *flavs;
3416 struct exp_flavor_info def_flavs[2];
3417 __be32 *p, *flavorsp;
3418 static bool report = true;
3419
3420 if (nfserr)
3421 goto out;
3422 nfserr = nfserr_resource;
3423 if (exp->ex_nflavors) {
3424 flavs = exp->ex_flavors;
3425 nflavs = exp->ex_nflavors;
3426 } else { /* Handling of some defaults in absence of real secinfo: */
3427 flavs = def_flavs;
3428 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3429 nflavs = 2;
3430 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3431 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3432 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3433 nflavs = 1;
3434 flavs[0].pseudoflavor
3435 = svcauth_gss_flavor(exp->ex_client);
3436 } else {
3437 nflavs = 1;
3438 flavs[0].pseudoflavor
3439 = exp->ex_client->flavour->flavour;
3440 }
3441 }
3442
3443 supported = 0;
3444 p = xdr_reserve_space(xdr, 4);
3445 if (!p)
3446 goto out;
3447 flavorsp = p++; /* to be backfilled later */
3448
3449 for (i = 0; i < nflavs; i++) {
3450 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3451 struct rpcsec_gss_info info;
3452
3453 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3454 supported++;
3455 p = xdr_reserve_space(xdr, 4 + 4 +
3456 XDR_LEN(info.oid.len) + 4 + 4);
3457 if (!p)
3458 goto out;
3459 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3460 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3461 *p++ = cpu_to_be32(info.qop);
3462 *p++ = cpu_to_be32(info.service);
3463 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3464 supported++;
3465 p = xdr_reserve_space(xdr, 4);
3466 if (!p)
3467 goto out;
3468 *p++ = cpu_to_be32(pf);
3469 } else {
3470 if (report)
3471 pr_warn("NFS: SECINFO: security flavor %u "
3472 "is not supported\n", pf);
3473 }
3474 }
3475
3476 if (nflavs != supported)
3477 report = false;
3478 *flavorsp = htonl(supported);
3479 nfserr = 0;
3480 out:
3481 if (exp)
3482 exp_put(exp);
3483 return nfserr;
3484 }
3485
3486 static __be32
3487 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3488 struct nfsd4_secinfo *secinfo)
3489 {
3490 struct xdr_stream *xdr = &resp->xdr;
3491
3492 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3493 }
3494
3495 static __be32
3496 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3497 struct nfsd4_secinfo_no_name *secinfo)
3498 {
3499 struct xdr_stream *xdr = &resp->xdr;
3500
3501 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3502 }
3503
3504 /*
3505 * The SETATTR encode routine is special -- it always encodes a bitmap,
3506 * regardless of the error status.
3507 */
3508 static __be32
3509 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3510 {
3511 struct xdr_stream *xdr = &resp->xdr;
3512 __be32 *p;
3513
3514 p = xdr_reserve_space(xdr, 16);
3515 if (!p)
3516 return nfserr_resource;
3517 if (nfserr) {
3518 *p++ = cpu_to_be32(3);
3519 *p++ = cpu_to_be32(0);
3520 *p++ = cpu_to_be32(0);
3521 *p++ = cpu_to_be32(0);
3522 }
3523 else {
3524 *p++ = cpu_to_be32(3);
3525 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3526 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3527 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3528 }
3529 return nfserr;
3530 }
3531
3532 static __be32
3533 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3534 {
3535 struct xdr_stream *xdr = &resp->xdr;
3536 __be32 *p;
3537
3538 if (!nfserr) {
3539 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3540 if (!p)
3541 return nfserr_resource;
3542 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3543 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3544 NFS4_VERIFIER_SIZE);
3545 }
3546 else if (nfserr == nfserr_clid_inuse) {
3547 p = xdr_reserve_space(xdr, 8);
3548 if (!p)
3549 return nfserr_resource;
3550 *p++ = cpu_to_be32(0);
3551 *p++ = cpu_to_be32(0);
3552 }
3553 return nfserr;
3554 }
3555
3556 static __be32
3557 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3558 {
3559 struct xdr_stream *xdr = &resp->xdr;
3560 __be32 *p;
3561
3562 if (!nfserr) {
3563 p = xdr_reserve_space(xdr, 16);
3564 if (!p)
3565 return nfserr_resource;
3566 *p++ = cpu_to_be32(write->wr_bytes_written);
3567 *p++ = cpu_to_be32(write->wr_how_written);
3568 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3569 NFS4_VERIFIER_SIZE);
3570 }
3571 return nfserr;
3572 }
3573
3574 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3575 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3576 1 << (OP_EXCHANGE_ID - 32) |
3577 1 << (OP_CREATE_SESSION - 32) |
3578 1 << (OP_DESTROY_SESSION - 32) |
3579 1 << (OP_DESTROY_CLIENTID - 32)
3580 };
3581
3582 static __be32
3583 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3584 struct nfsd4_exchange_id *exid)
3585 {
3586 struct xdr_stream *xdr = &resp->xdr;
3587 __be32 *p;
3588 char *major_id;
3589 char *server_scope;
3590 int major_id_sz;
3591 int server_scope_sz;
3592 uint64_t minor_id = 0;
3593
3594 if (nfserr)
3595 return nfserr;
3596
3597 major_id = utsname()->nodename;
3598 major_id_sz = strlen(major_id);
3599 server_scope = utsname()->nodename;
3600 server_scope_sz = strlen(server_scope);
3601
3602 p = xdr_reserve_space(xdr,
3603 8 /* eir_clientid */ +
3604 4 /* eir_sequenceid */ +
3605 4 /* eir_flags */ +
3606 4 /* spr_how */);
3607 if (!p)
3608 return nfserr_resource;
3609
3610 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3611 *p++ = cpu_to_be32(exid->seqid);
3612 *p++ = cpu_to_be32(exid->flags);
3613
3614 *p++ = cpu_to_be32(exid->spa_how);
3615
3616 switch (exid->spa_how) {
3617 case SP4_NONE:
3618 break;
3619 case SP4_MACH_CRED:
3620 /* spo_must_enforce, spo_must_allow */
3621 p = xdr_reserve_space(xdr, 16);
3622 if (!p)
3623 return nfserr_resource;
3624
3625 /* spo_must_enforce bitmap: */
3626 *p++ = cpu_to_be32(2);
3627 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3628 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3629 /* empty spo_must_allow bitmap: */
3630 *p++ = cpu_to_be32(0);
3631
3632 break;
3633 default:
3634 WARN_ON_ONCE(1);
3635 }
3636
3637 p = xdr_reserve_space(xdr,
3638 8 /* so_minor_id */ +
3639 4 /* so_major_id.len */ +
3640 (XDR_QUADLEN(major_id_sz) * 4) +
3641 4 /* eir_server_scope.len */ +
3642 (XDR_QUADLEN(server_scope_sz) * 4) +
3643 4 /* eir_server_impl_id.count (0) */);
3644 if (!p)
3645 return nfserr_resource;
3646
3647 /* The server_owner struct */
3648 p = xdr_encode_hyper(p, minor_id); /* Minor id */
3649 /* major id */
3650 p = xdr_encode_opaque(p, major_id, major_id_sz);
3651
3652 /* Server scope */
3653 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3654
3655 /* Implementation id */
3656 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
3657 return 0;
3658 }
3659
3660 static __be32
3661 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3662 struct nfsd4_create_session *sess)
3663 {
3664 struct xdr_stream *xdr = &resp->xdr;
3665 __be32 *p;
3666
3667 if (nfserr)
3668 return nfserr;
3669
3670 p = xdr_reserve_space(xdr, 24);
3671 if (!p)
3672 return nfserr_resource;
3673 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3674 NFS4_MAX_SESSIONID_LEN);
3675 *p++ = cpu_to_be32(sess->seqid);
3676 *p++ = cpu_to_be32(sess->flags);
3677
3678 p = xdr_reserve_space(xdr, 28);
3679 if (!p)
3680 return nfserr_resource;
3681 *p++ = cpu_to_be32(0); /* headerpadsz */
3682 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3683 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3684 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3685 *p++ = cpu_to_be32(sess->fore_channel.maxops);
3686 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3687 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3688
3689 if (sess->fore_channel.nr_rdma_attrs) {
3690 p = xdr_reserve_space(xdr, 4);
3691 if (!p)
3692 return nfserr_resource;
3693 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3694 }
3695
3696 p = xdr_reserve_space(xdr, 28);
3697 if (!p)
3698 return nfserr_resource;
3699 *p++ = cpu_to_be32(0); /* headerpadsz */
3700 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3701 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3702 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3703 *p++ = cpu_to_be32(sess->back_channel.maxops);
3704 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3705 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3706
3707 if (sess->back_channel.nr_rdma_attrs) {
3708 p = xdr_reserve_space(xdr, 4);
3709 if (!p)
3710 return nfserr_resource;
3711 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3712 }
3713 return 0;
3714 }
3715
3716 static __be32
3717 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3718 struct nfsd4_sequence *seq)
3719 {
3720 struct xdr_stream *xdr = &resp->xdr;
3721 __be32 *p;
3722
3723 if (nfserr)
3724 return nfserr;
3725
3726 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3727 if (!p)
3728 return nfserr_resource;
3729 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
3730 NFS4_MAX_SESSIONID_LEN);
3731 *p++ = cpu_to_be32(seq->seqid);
3732 *p++ = cpu_to_be32(seq->slotid);
3733 /* Note slotid's are numbered from zero: */
3734 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
3735 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
3736 *p++ = cpu_to_be32(seq->status_flags);
3737
3738 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3739 return 0;
3740 }
3741
3742 static __be32
3743 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3744 struct nfsd4_test_stateid *test_stateid)
3745 {
3746 struct xdr_stream *xdr = &resp->xdr;
3747 struct nfsd4_test_stateid_id *stateid, *next;
3748 __be32 *p;
3749
3750 if (nfserr)
3751 return nfserr;
3752
3753 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3754 if (!p)
3755 return nfserr_resource;
3756 *p++ = htonl(test_stateid->ts_num_ids);
3757
3758 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3759 *p++ = stateid->ts_id_status;
3760 }
3761
3762 return nfserr;
3763 }
3764
3765 static __be32
3766 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3767 {
3768 return nfserr;
3769 }
3770
3771 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3772
3773 /*
3774 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3775 * since we don't need to filter out obsolete ops as this is
3776 * done in the decoding phase.
3777 */
3778 static nfsd4_enc nfsd4_enc_ops[] = {
3779 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
3780 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
3781 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
3782 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
3783 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
3784 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3785 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
3786 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
3787 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
3788 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
3789 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
3790 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
3791 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
3792 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
3793 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3794 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
3795 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
3796 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
3797 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
3798 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
3799 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
3800 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
3801 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
3802 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
3803 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
3804 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
3805 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
3806 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
3807 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
3808 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
3809 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
3810 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
3811 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
3812 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3813 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3814 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
3815 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
3816
3817 /* NFSv4.1 operations */
3818 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
3819 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3820 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
3821 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
3822 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3823 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
3824 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3825 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
3826 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
3827 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
3828 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
3829 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3830 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3831 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
3832 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
3833 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
3834 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3835 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
3836 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
3837 };
3838
3839 /*
3840 * Calculate whether we still have space to encode repsize bytes.
3841 * There are two considerations:
3842 * - For NFS versions >=4.1, the size of the reply must stay within
3843 * session limits
3844 * - For all NFS versions, we must stay within limited preallocated
3845 * buffer space.
3846 *
3847 * This is called before the operation is processed, so can only provide
3848 * an upper estimate. For some nonidempotent operations (such as
3849 * getattr), it's not necessarily a problem if that estimate is wrong,
3850 * as we can fail it after processing without significant side effects.
3851 */
3852 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
3853 {
3854 struct xdr_buf *buf = &resp->rqstp->rq_res;
3855 struct nfsd4_slot *slot = resp->cstate.slot;
3856
3857 if (buf->len + respsize <= buf->buflen)
3858 return nfs_ok;
3859 if (!nfsd4_has_session(&resp->cstate))
3860 return nfserr_resource;
3861 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
3862 WARN_ON_ONCE(1);
3863 return nfserr_rep_too_big_to_cache;
3864 }
3865 return nfserr_rep_too_big;
3866 }
3867
3868 void
3869 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3870 {
3871 struct xdr_stream *xdr = &resp->xdr;
3872 struct nfs4_stateowner *so = resp->cstate.replay_owner;
3873 struct svc_rqst *rqstp = resp->rqstp;
3874 int post_err_offset;
3875 nfsd4_enc encoder;
3876 __be32 *p;
3877
3878 p = xdr_reserve_space(xdr, 8);
3879 if (!p) {
3880 WARN_ON_ONCE(1);
3881 return;
3882 }
3883 *p++ = cpu_to_be32(op->opnum);
3884 post_err_offset = xdr->buf->len;
3885
3886 if (op->opnum == OP_ILLEGAL)
3887 goto status;
3888 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3889 !nfsd4_enc_ops[op->opnum]);
3890 encoder = nfsd4_enc_ops[op->opnum];
3891 op->status = encoder(resp, op->status, &op->u);
3892 xdr_commit_encode(xdr);
3893
3894 /* nfsd4_check_resp_size guarantees enough room for error status */
3895 if (!op->status) {
3896 int space_needed = 0;
3897 if (!nfsd4_last_compound_op(rqstp))
3898 space_needed = COMPOUND_ERR_SLACK_SPACE;
3899 op->status = nfsd4_check_resp_size(resp, space_needed);
3900 }
3901 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
3902 struct nfsd4_slot *slot = resp->cstate.slot;
3903
3904 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
3905 op->status = nfserr_rep_too_big_to_cache;
3906 else
3907 op->status = nfserr_rep_too_big;
3908 }
3909 if (op->status == nfserr_resource ||
3910 op->status == nfserr_rep_too_big ||
3911 op->status == nfserr_rep_too_big_to_cache) {
3912 /*
3913 * The operation may have already been encoded or
3914 * partially encoded. No op returns anything additional
3915 * in the case of one of these three errors, so we can
3916 * just truncate back to after the status. But it's a
3917 * bug if we had to do this on a non-idempotent op:
3918 */
3919 warn_on_nonidempotent_op(op);
3920 xdr_truncate_encode(xdr, post_err_offset);
3921 }
3922 if (so) {
3923 int len = xdr->buf->len - post_err_offset;
3924
3925 so->so_replay.rp_status = op->status;
3926 so->so_replay.rp_buflen = len;
3927 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
3928 so->so_replay.rp_buf, len);
3929 }
3930 status:
3931 /* Note that op->status is already in network byte order: */
3932 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
3933 }
3934
3935 /*
3936 * Encode the reply stored in the stateowner reply cache
3937 *
3938 * XDR note: do not encode rp->rp_buflen: the buffer contains the
3939 * previously sent already encoded operation.
3940 *
3941 * called with nfs4_lock_state() held
3942 */
3943 void
3944 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
3945 {
3946 __be32 *p;
3947 struct nfs4_replay *rp = op->replay;
3948
3949 BUG_ON(!rp);
3950
3951 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
3952 if (!p) {
3953 WARN_ON_ONCE(1);
3954 return;
3955 }
3956 *p++ = cpu_to_be32(op->opnum);
3957 *p++ = rp->rp_status; /* already xdr'ed */
3958
3959 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
3960 }
3961
3962 int
3963 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3964 {
3965 return xdr_ressize_check(rqstp, p);
3966 }
3967
3968 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3969 {
3970 struct svc_rqst *rqstp = rq;
3971 struct nfsd4_compoundargs *args = rqstp->rq_argp;
3972
3973 if (args->ops != args->iops) {
3974 kfree(args->ops);
3975 args->ops = args->iops;
3976 }
3977 kfree(args->tmpp);
3978 args->tmpp = NULL;
3979 while (args->to_free) {
3980 struct tmpbuf *tb = args->to_free;
3981 args->to_free = tb->next;
3982 tb->release(tb->buf);
3983 kfree(tb);
3984 }
3985 return 1;
3986 }
3987
3988 int
3989 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3990 {
3991 if (rqstp->rq_arg.head[0].iov_len % 4) {
3992 /* client is nuts */
3993 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
3994 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
3995 return 0;
3996 }
3997 args->p = p;
3998 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3999 args->pagelist = rqstp->rq_arg.pages;
4000 args->pagelen = rqstp->rq_arg.page_len;
4001 args->tmpp = NULL;
4002 args->to_free = NULL;
4003 args->ops = args->iops;
4004 args->rqstp = rqstp;
4005
4006 return !nfsd4_decode_compound(args);
4007 }
4008
4009 int
4010 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4011 {
4012 /*
4013 * All that remains is to write the tag and operation count...
4014 */
4015 struct nfsd4_compound_state *cs = &resp->cstate;
4016 struct xdr_buf *buf = resp->xdr.buf;
4017
4018 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4019 buf->tail[0].iov_len);
4020
4021 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4022
4023 p = resp->tagp;
4024 *p++ = htonl(resp->taglen);
4025 memcpy(p, resp->tag, resp->taglen);
4026 p += XDR_QUADLEN(resp->taglen);
4027 *p++ = htonl(resp->opcnt);
4028
4029 if (nfsd4_has_session(cs)) {
4030 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4031 struct nfs4_client *clp = cs->session->se_client;
4032 if (cs->status != nfserr_replay_cache) {
4033 nfsd4_store_cache_entry(resp);
4034 cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
4035 }
4036 /* Renew the clientid on success and on replay */
4037 spin_lock(&nn->client_lock);
4038 nfsd4_put_session(cs->session);
4039 spin_unlock(&nn->client_lock);
4040 put_client_renew(clp);
4041 }
4042 return 1;
4043 }
4044
4045 /*
4046 * Local variables:
4047 * c-basic-offset: 8
4048 * End:
4049 */
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