?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
powerpc/pseries: Failure on removing device node
[linux/fpc-iii.git] / fs / nfsd / nfs4xdr.c
blobf9821ce6658a4b09006e7d51d575319658753501
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 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
185 * @argp: NFSv4 compound argument structure
186 * @p: pointer to be freed (with kfree())
187 *
188 * Marks @p to be freed when processing the compound operation
189 * described in @argp finishes.
190 */
191 static void *
192 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
193 {
194 struct svcxdr_tmpbuf *tb;
195
196 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
197 if (!tb)
198 return NULL;
199 tb->next = argp->to_free;
200 argp->to_free = tb;
201 return tb->buf;
202 }
203
204 /*
205 * For xdr strings that need to be passed to other kernel api's
206 * as null-terminated strings.
207 *
208 * Note null-terminating in place usually isn't safe since the
209 * buffer might end on a page boundary.
210 */
211 static char *
212 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
213 {
214 char *p = svcxdr_tmpalloc(argp, len + 1);
215
216 if (!p)
217 return NULL;
218 memcpy(p, buf, len);
219 p[len] = '\0';
220 return p;
221 }
222
223 /**
224 * savemem - duplicate a chunk of memory for later processing
225 * @argp: NFSv4 compound argument structure to be freed with
226 * @p: pointer to be duplicated
227 * @nbytes: length to be duplicated
228 *
229 * Returns a pointer to a copy of @nbytes bytes of memory at @p
230 * that are preserved until processing of the NFSv4 compound
231 * operation described by @argp finishes.
232 */
233 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
234 {
235 void *ret;
236
237 ret = svcxdr_tmpalloc(argp, nbytes);
238 if (!ret)
239 return NULL;
240 memcpy(ret, p, nbytes);
241 return ret;
242 }
243
244 static __be32
245 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
246 {
247 u32 bmlen;
248 DECODE_HEAD;
249
250 bmval[0] = 0;
251 bmval[1] = 0;
252 bmval[2] = 0;
253
254 READ_BUF(4);
255 bmlen = be32_to_cpup(p++);
256 if (bmlen > 1000)
257 goto xdr_error;
258
259 READ_BUF(bmlen << 2);
260 if (bmlen > 0)
261 bmval[0] = be32_to_cpup(p++);
262 if (bmlen > 1)
263 bmval[1] = be32_to_cpup(p++);
264 if (bmlen > 2)
265 bmval[2] = be32_to_cpup(p++);
266
267 DECODE_TAIL;
268 }
269
270 static __be32
271 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
272 struct iattr *iattr, struct nfs4_acl **acl,
273 struct xdr_netobj *label)
274 {
275 int expected_len, len = 0;
276 u32 dummy32;
277 u64 sec;
278 char *buf;
279
280 DECODE_HEAD;
281 iattr->ia_valid = 0;
282 if ((status = nfsd4_decode_bitmap(argp, bmval)))
283 return status;
284
285 READ_BUF(4);
286 expected_len = be32_to_cpup(p++);
287
288 if (bmval[0] & FATTR4_WORD0_SIZE) {
289 READ_BUF(8);
290 len += 8;
291 p = xdr_decode_hyper(p, &iattr->ia_size);
292 iattr->ia_valid |= ATTR_SIZE;
293 }
294 if (bmval[0] & FATTR4_WORD0_ACL) {
295 u32 nace;
296 struct nfs4_ace *ace;
297
298 READ_BUF(4); len += 4;
299 nace = be32_to_cpup(p++);
300
301 if (nace > NFS4_ACL_MAX)
302 return nfserr_fbig;
303
304 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
305 if (*acl == NULL)
306 return nfserr_jukebox;
307
308 (*acl)->naces = nace;
309 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
310 READ_BUF(16); len += 16;
311 ace->type = be32_to_cpup(p++);
312 ace->flag = be32_to_cpup(p++);
313 ace->access_mask = be32_to_cpup(p++);
314 dummy32 = be32_to_cpup(p++);
315 READ_BUF(dummy32);
316 len += XDR_QUADLEN(dummy32) << 2;
317 READMEM(buf, dummy32);
318 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
319 status = nfs_ok;
320 if (ace->whotype != NFS4_ACL_WHO_NAMED)
321 ;
322 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
323 status = nfsd_map_name_to_gid(argp->rqstp,
324 buf, dummy32, &ace->who_gid);
325 else
326 status = nfsd_map_name_to_uid(argp->rqstp,
327 buf, dummy32, &ace->who_uid);
328 if (status)
329 return status;
330 }
331 } else
332 *acl = NULL;
333 if (bmval[1] & FATTR4_WORD1_MODE) {
334 READ_BUF(4);
335 len += 4;
336 iattr->ia_mode = be32_to_cpup(p++);
337 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
338 iattr->ia_valid |= ATTR_MODE;
339 }
340 if (bmval[1] & FATTR4_WORD1_OWNER) {
341 READ_BUF(4);
342 len += 4;
343 dummy32 = be32_to_cpup(p++);
344 READ_BUF(dummy32);
345 len += (XDR_QUADLEN(dummy32) << 2);
346 READMEM(buf, dummy32);
347 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
348 return status;
349 iattr->ia_valid |= ATTR_UID;
350 }
351 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
352 READ_BUF(4);
353 len += 4;
354 dummy32 = be32_to_cpup(p++);
355 READ_BUF(dummy32);
356 len += (XDR_QUADLEN(dummy32) << 2);
357 READMEM(buf, dummy32);
358 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
359 return status;
360 iattr->ia_valid |= ATTR_GID;
361 }
362 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
363 READ_BUF(4);
364 len += 4;
365 dummy32 = be32_to_cpup(p++);
366 switch (dummy32) {
367 case NFS4_SET_TO_CLIENT_TIME:
368 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
369 all 32 bits of 'nseconds'. */
370 READ_BUF(12);
371 len += 12;
372 p = xdr_decode_hyper(p, &sec);
373 iattr->ia_atime.tv_sec = (time_t)sec;
374 iattr->ia_atime.tv_nsec = be32_to_cpup(p++);
375 if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
376 return nfserr_inval;
377 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
378 break;
379 case NFS4_SET_TO_SERVER_TIME:
380 iattr->ia_valid |= ATTR_ATIME;
381 break;
382 default:
383 goto xdr_error;
384 }
385 }
386 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
387 READ_BUF(4);
388 len += 4;
389 dummy32 = be32_to_cpup(p++);
390 switch (dummy32) {
391 case NFS4_SET_TO_CLIENT_TIME:
392 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
393 all 32 bits of 'nseconds'. */
394 READ_BUF(12);
395 len += 12;
396 p = xdr_decode_hyper(p, &sec);
397 iattr->ia_mtime.tv_sec = sec;
398 iattr->ia_mtime.tv_nsec = be32_to_cpup(p++);
399 if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
400 return nfserr_inval;
401 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
402 break;
403 case NFS4_SET_TO_SERVER_TIME:
404 iattr->ia_valid |= ATTR_MTIME;
405 break;
406 default:
407 goto xdr_error;
408 }
409 }
410
411 label->len = 0;
412 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
413 if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
414 READ_BUF(4);
415 len += 4;
416 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
417 READ_BUF(4);
418 len += 4;
419 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
420 READ_BUF(4);
421 len += 4;
422 dummy32 = be32_to_cpup(p++);
423 READ_BUF(dummy32);
424 if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
425 return nfserr_badlabel;
426 len += (XDR_QUADLEN(dummy32) << 2);
427 READMEM(buf, dummy32);
428 label->len = dummy32;
429 label->data = svcxdr_dupstr(argp, buf, dummy32);
430 if (!label->data)
431 return nfserr_jukebox;
432 }
433 #endif
434
435 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
436 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
437 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
438 READ_BUF(expected_len - len);
439 else if (len != expected_len)
440 goto xdr_error;
441
442 DECODE_TAIL;
443 }
444
445 static __be32
446 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
447 {
448 DECODE_HEAD;
449
450 READ_BUF(sizeof(stateid_t));
451 sid->si_generation = be32_to_cpup(p++);
452 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
453
454 DECODE_TAIL;
455 }
456
457 static __be32
458 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
459 {
460 DECODE_HEAD;
461
462 READ_BUF(4);
463 access->ac_req_access = be32_to_cpup(p++);
464
465 DECODE_TAIL;
466 }
467
468 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
469 {
470 DECODE_HEAD;
471 u32 dummy, uid, gid;
472 char *machine_name;
473 int i;
474 int nr_secflavs;
475
476 /* callback_sec_params4 */
477 READ_BUF(4);
478 nr_secflavs = be32_to_cpup(p++);
479 if (nr_secflavs)
480 cbs->flavor = (u32)(-1);
481 else
482 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
483 cbs->flavor = 0;
484 for (i = 0; i < nr_secflavs; ++i) {
485 READ_BUF(4);
486 dummy = be32_to_cpup(p++);
487 switch (dummy) {
488 case RPC_AUTH_NULL:
489 /* Nothing to read */
490 if (cbs->flavor == (u32)(-1))
491 cbs->flavor = RPC_AUTH_NULL;
492 break;
493 case RPC_AUTH_UNIX:
494 READ_BUF(8);
495 /* stamp */
496 dummy = be32_to_cpup(p++);
497
498 /* machine name */
499 dummy = be32_to_cpup(p++);
500 READ_BUF(dummy);
501 SAVEMEM(machine_name, dummy);
502
503 /* uid, gid */
504 READ_BUF(8);
505 uid = be32_to_cpup(p++);
506 gid = be32_to_cpup(p++);
507
508 /* more gids */
509 READ_BUF(4);
510 dummy = be32_to_cpup(p++);
511 READ_BUF(dummy * 4);
512 if (cbs->flavor == (u32)(-1)) {
513 kuid_t kuid = make_kuid(&init_user_ns, uid);
514 kgid_t kgid = make_kgid(&init_user_ns, gid);
515 if (uid_valid(kuid) && gid_valid(kgid)) {
516 cbs->uid = kuid;
517 cbs->gid = kgid;
518 cbs->flavor = RPC_AUTH_UNIX;
519 } else {
520 dprintk("RPC_AUTH_UNIX with invalid"
521 "uid or gid ignoring!\n");
522 }
523 }
524 break;
525 case RPC_AUTH_GSS:
526 dprintk("RPC_AUTH_GSS callback secflavor "
527 "not supported!\n");
528 READ_BUF(8);
529 /* gcbp_service */
530 dummy = be32_to_cpup(p++);
531 /* gcbp_handle_from_server */
532 dummy = be32_to_cpup(p++);
533 READ_BUF(dummy);
534 p += XDR_QUADLEN(dummy);
535 /* gcbp_handle_from_client */
536 READ_BUF(4);
537 dummy = be32_to_cpup(p++);
538 READ_BUF(dummy);
539 break;
540 default:
541 dprintk("Illegal callback secflavor\n");
542 return nfserr_inval;
543 }
544 }
545 DECODE_TAIL;
546 }
547
548 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
549 {
550 DECODE_HEAD;
551
552 READ_BUF(4);
553 bc->bc_cb_program = be32_to_cpup(p++);
554 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
555
556 DECODE_TAIL;
557 }
558
559 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
560 {
561 DECODE_HEAD;
562
563 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
564 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
565 bcts->dir = be32_to_cpup(p++);
566 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
567 * could help us figure out we should be using it. */
568 DECODE_TAIL;
569 }
570
571 static __be32
572 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
573 {
574 DECODE_HEAD;
575
576 READ_BUF(4);
577 close->cl_seqid = be32_to_cpup(p++);
578 return nfsd4_decode_stateid(argp, &close->cl_stateid);
579
580 DECODE_TAIL;
581 }
582
583
584 static __be32
585 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
586 {
587 DECODE_HEAD;
588
589 READ_BUF(12);
590 p = xdr_decode_hyper(p, &commit->co_offset);
591 commit->co_count = be32_to_cpup(p++);
592
593 DECODE_TAIL;
594 }
595
596 static __be32
597 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
598 {
599 DECODE_HEAD;
600
601 READ_BUF(4);
602 create->cr_type = be32_to_cpup(p++);
603 switch (create->cr_type) {
604 case NF4LNK:
605 READ_BUF(4);
606 create->cr_datalen = be32_to_cpup(p++);
607 READ_BUF(create->cr_datalen);
608 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
609 if (!create->cr_data)
610 return nfserr_jukebox;
611 break;
612 case NF4BLK:
613 case NF4CHR:
614 READ_BUF(8);
615 create->cr_specdata1 = be32_to_cpup(p++);
616 create->cr_specdata2 = be32_to_cpup(p++);
617 break;
618 case NF4SOCK:
619 case NF4FIFO:
620 case NF4DIR:
621 default:
622 break;
623 }
624
625 READ_BUF(4);
626 create->cr_namelen = be32_to_cpup(p++);
627 READ_BUF(create->cr_namelen);
628 SAVEMEM(create->cr_name, create->cr_namelen);
629 if ((status = check_filename(create->cr_name, create->cr_namelen)))
630 return status;
631
632 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
633 &create->cr_acl, &create->cr_label);
634 if (status)
635 goto out;
636
637 DECODE_TAIL;
638 }
639
640 static inline __be32
641 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
642 {
643 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
644 }
645
646 static inline __be32
647 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
648 {
649 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
650 }
651
652 static __be32
653 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
654 {
655 DECODE_HEAD;
656
657 READ_BUF(4);
658 link->li_namelen = be32_to_cpup(p++);
659 READ_BUF(link->li_namelen);
660 SAVEMEM(link->li_name, link->li_namelen);
661 if ((status = check_filename(link->li_name, link->li_namelen)))
662 return status;
663
664 DECODE_TAIL;
665 }
666
667 static __be32
668 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
669 {
670 DECODE_HEAD;
671
672 /*
673 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
674 */
675 READ_BUF(28);
676 lock->lk_type = be32_to_cpup(p++);
677 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
678 goto xdr_error;
679 lock->lk_reclaim = be32_to_cpup(p++);
680 p = xdr_decode_hyper(p, &lock->lk_offset);
681 p = xdr_decode_hyper(p, &lock->lk_length);
682 lock->lk_is_new = be32_to_cpup(p++);
683
684 if (lock->lk_is_new) {
685 READ_BUF(4);
686 lock->lk_new_open_seqid = be32_to_cpup(p++);
687 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
688 if (status)
689 return status;
690 READ_BUF(8 + sizeof(clientid_t));
691 lock->lk_new_lock_seqid = be32_to_cpup(p++);
692 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
693 lock->lk_new_owner.len = be32_to_cpup(p++);
694 READ_BUF(lock->lk_new_owner.len);
695 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
696 } else {
697 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
698 if (status)
699 return status;
700 READ_BUF(4);
701 lock->lk_old_lock_seqid = be32_to_cpup(p++);
702 }
703
704 DECODE_TAIL;
705 }
706
707 static __be32
708 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
709 {
710 DECODE_HEAD;
711
712 READ_BUF(32);
713 lockt->lt_type = be32_to_cpup(p++);
714 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
715 goto xdr_error;
716 p = xdr_decode_hyper(p, &lockt->lt_offset);
717 p = xdr_decode_hyper(p, &lockt->lt_length);
718 COPYMEM(&lockt->lt_clientid, 8);
719 lockt->lt_owner.len = be32_to_cpup(p++);
720 READ_BUF(lockt->lt_owner.len);
721 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
722
723 DECODE_TAIL;
724 }
725
726 static __be32
727 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
728 {
729 DECODE_HEAD;
730
731 READ_BUF(8);
732 locku->lu_type = be32_to_cpup(p++);
733 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
734 goto xdr_error;
735 locku->lu_seqid = be32_to_cpup(p++);
736 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
737 if (status)
738 return status;
739 READ_BUF(16);
740 p = xdr_decode_hyper(p, &locku->lu_offset);
741 p = xdr_decode_hyper(p, &locku->lu_length);
742
743 DECODE_TAIL;
744 }
745
746 static __be32
747 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
748 {
749 DECODE_HEAD;
750
751 READ_BUF(4);
752 lookup->lo_len = be32_to_cpup(p++);
753 READ_BUF(lookup->lo_len);
754 SAVEMEM(lookup->lo_name, lookup->lo_len);
755 if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
756 return status;
757
758 DECODE_TAIL;
759 }
760
761 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
762 {
763 __be32 *p;
764 u32 w;
765
766 READ_BUF(4);
767 w = be32_to_cpup(p++);
768 *share_access = w & NFS4_SHARE_ACCESS_MASK;
769 *deleg_want = w & NFS4_SHARE_WANT_MASK;
770 if (deleg_when)
771 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
772
773 switch (w & NFS4_SHARE_ACCESS_MASK) {
774 case NFS4_SHARE_ACCESS_READ:
775 case NFS4_SHARE_ACCESS_WRITE:
776 case NFS4_SHARE_ACCESS_BOTH:
777 break;
778 default:
779 return nfserr_bad_xdr;
780 }
781 w &= ~NFS4_SHARE_ACCESS_MASK;
782 if (!w)
783 return nfs_ok;
784 if (!argp->minorversion)
785 return nfserr_bad_xdr;
786 switch (w & NFS4_SHARE_WANT_MASK) {
787 case NFS4_SHARE_WANT_NO_PREFERENCE:
788 case NFS4_SHARE_WANT_READ_DELEG:
789 case NFS4_SHARE_WANT_WRITE_DELEG:
790 case NFS4_SHARE_WANT_ANY_DELEG:
791 case NFS4_SHARE_WANT_NO_DELEG:
792 case NFS4_SHARE_WANT_CANCEL:
793 break;
794 default:
795 return nfserr_bad_xdr;
796 }
797 w &= ~NFS4_SHARE_WANT_MASK;
798 if (!w)
799 return nfs_ok;
800
801 if (!deleg_when) /* open_downgrade */
802 return nfserr_inval;
803 switch (w) {
804 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
805 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
806 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
807 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
808 return nfs_ok;
809 }
810 xdr_error:
811 return nfserr_bad_xdr;
812 }
813
814 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
815 {
816 __be32 *p;
817
818 READ_BUF(4);
819 *x = be32_to_cpup(p++);
820 /* Note: unlinke access bits, deny bits may be zero. */
821 if (*x & ~NFS4_SHARE_DENY_BOTH)
822 return nfserr_bad_xdr;
823 return nfs_ok;
824 xdr_error:
825 return nfserr_bad_xdr;
826 }
827
828 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
829 {
830 __be32 *p;
831
832 READ_BUF(4);
833 o->len = be32_to_cpup(p++);
834
835 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
836 return nfserr_bad_xdr;
837
838 READ_BUF(o->len);
839 SAVEMEM(o->data, o->len);
840 return nfs_ok;
841 xdr_error:
842 return nfserr_bad_xdr;
843 }
844
845 static __be32
846 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
847 {
848 DECODE_HEAD;
849 u32 dummy;
850
851 memset(open->op_bmval, 0, sizeof(open->op_bmval));
852 open->op_iattr.ia_valid = 0;
853 open->op_openowner = NULL;
854
855 open->op_xdr_error = 0;
856 /* seqid, share_access, share_deny, clientid, ownerlen */
857 READ_BUF(4);
858 open->op_seqid = be32_to_cpup(p++);
859 /* decode, yet ignore deleg_when until supported */
860 status = nfsd4_decode_share_access(argp, &open->op_share_access,
861 &open->op_deleg_want, &dummy);
862 if (status)
863 goto xdr_error;
864 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
865 if (status)
866 goto xdr_error;
867 READ_BUF(sizeof(clientid_t));
868 COPYMEM(&open->op_clientid, sizeof(clientid_t));
869 status = nfsd4_decode_opaque(argp, &open->op_owner);
870 if (status)
871 goto xdr_error;
872 READ_BUF(4);
873 open->op_create = be32_to_cpup(p++);
874 switch (open->op_create) {
875 case NFS4_OPEN_NOCREATE:
876 break;
877 case NFS4_OPEN_CREATE:
878 READ_BUF(4);
879 open->op_createmode = be32_to_cpup(p++);
880 switch (open->op_createmode) {
881 case NFS4_CREATE_UNCHECKED:
882 case NFS4_CREATE_GUARDED:
883 status = nfsd4_decode_fattr(argp, open->op_bmval,
884 &open->op_iattr, &open->op_acl, &open->op_label);
885 if (status)
886 goto out;
887 break;
888 case NFS4_CREATE_EXCLUSIVE:
889 READ_BUF(NFS4_VERIFIER_SIZE);
890 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
891 break;
892 case NFS4_CREATE_EXCLUSIVE4_1:
893 if (argp->minorversion < 1)
894 goto xdr_error;
895 READ_BUF(NFS4_VERIFIER_SIZE);
896 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
897 status = nfsd4_decode_fattr(argp, open->op_bmval,
898 &open->op_iattr, &open->op_acl, &open->op_label);
899 if (status)
900 goto out;
901 break;
902 default:
903 goto xdr_error;
904 }
905 break;
906 default:
907 goto xdr_error;
908 }
909
910 /* open_claim */
911 READ_BUF(4);
912 open->op_claim_type = be32_to_cpup(p++);
913 switch (open->op_claim_type) {
914 case NFS4_OPEN_CLAIM_NULL:
915 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
916 READ_BUF(4);
917 open->op_fname.len = be32_to_cpup(p++);
918 READ_BUF(open->op_fname.len);
919 SAVEMEM(open->op_fname.data, open->op_fname.len);
920 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
921 return status;
922 break;
923 case NFS4_OPEN_CLAIM_PREVIOUS:
924 READ_BUF(4);
925 open->op_delegate_type = be32_to_cpup(p++);
926 break;
927 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
928 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
929 if (status)
930 return status;
931 READ_BUF(4);
932 open->op_fname.len = be32_to_cpup(p++);
933 READ_BUF(open->op_fname.len);
934 SAVEMEM(open->op_fname.data, open->op_fname.len);
935 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
936 return status;
937 break;
938 case NFS4_OPEN_CLAIM_FH:
939 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
940 if (argp->minorversion < 1)
941 goto xdr_error;
942 /* void */
943 break;
944 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
945 if (argp->minorversion < 1)
946 goto xdr_error;
947 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
948 if (status)
949 return status;
950 break;
951 default:
952 goto xdr_error;
953 }
954
955 DECODE_TAIL;
956 }
957
958 static __be32
959 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
960 {
961 DECODE_HEAD;
962
963 if (argp->minorversion >= 1)
964 return nfserr_notsupp;
965
966 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
967 if (status)
968 return status;
969 READ_BUF(4);
970 open_conf->oc_seqid = be32_to_cpup(p++);
971
972 DECODE_TAIL;
973 }
974
975 static __be32
976 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
977 {
978 DECODE_HEAD;
979
980 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
981 if (status)
982 return status;
983 READ_BUF(4);
984 open_down->od_seqid = be32_to_cpup(p++);
985 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
986 &open_down->od_deleg_want, NULL);
987 if (status)
988 return status;
989 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
990 if (status)
991 return status;
992 DECODE_TAIL;
993 }
994
995 static __be32
996 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
997 {
998 DECODE_HEAD;
999
1000 READ_BUF(4);
1001 putfh->pf_fhlen = be32_to_cpup(p++);
1002 if (putfh->pf_fhlen > NFS4_FHSIZE)
1003 goto xdr_error;
1004 READ_BUF(putfh->pf_fhlen);
1005 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1006
1007 DECODE_TAIL;
1008 }
1009
1010 static __be32
1011 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1012 {
1013 if (argp->minorversion == 0)
1014 return nfs_ok;
1015 return nfserr_notsupp;
1016 }
1017
1018 static __be32
1019 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1020 {
1021 DECODE_HEAD;
1022
1023 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1024 if (status)
1025 return status;
1026 READ_BUF(12);
1027 p = xdr_decode_hyper(p, &read->rd_offset);
1028 read->rd_length = be32_to_cpup(p++);
1029
1030 DECODE_TAIL;
1031 }
1032
1033 static __be32
1034 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1035 {
1036 DECODE_HEAD;
1037
1038 READ_BUF(24);
1039 p = xdr_decode_hyper(p, &readdir->rd_cookie);
1040 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1041 readdir->rd_dircount = be32_to_cpup(p++);
1042 readdir->rd_maxcount = be32_to_cpup(p++);
1043 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1044 goto out;
1045
1046 DECODE_TAIL;
1047 }
1048
1049 static __be32
1050 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1051 {
1052 DECODE_HEAD;
1053
1054 READ_BUF(4);
1055 remove->rm_namelen = be32_to_cpup(p++);
1056 READ_BUF(remove->rm_namelen);
1057 SAVEMEM(remove->rm_name, remove->rm_namelen);
1058 if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1059 return status;
1060
1061 DECODE_TAIL;
1062 }
1063
1064 static __be32
1065 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1066 {
1067 DECODE_HEAD;
1068
1069 READ_BUF(4);
1070 rename->rn_snamelen = be32_to_cpup(p++);
1071 READ_BUF(rename->rn_snamelen + 4);
1072 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1073 rename->rn_tnamelen = be32_to_cpup(p++);
1074 READ_BUF(rename->rn_tnamelen);
1075 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1076 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1077 return status;
1078 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1079 return status;
1080
1081 DECODE_TAIL;
1082 }
1083
1084 static __be32
1085 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1086 {
1087 DECODE_HEAD;
1088
1089 if (argp->minorversion >= 1)
1090 return nfserr_notsupp;
1091
1092 READ_BUF(sizeof(clientid_t));
1093 COPYMEM(clientid, sizeof(clientid_t));
1094
1095 DECODE_TAIL;
1096 }
1097
1098 static __be32
1099 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1100 struct nfsd4_secinfo *secinfo)
1101 {
1102 DECODE_HEAD;
1103
1104 READ_BUF(4);
1105 secinfo->si_namelen = be32_to_cpup(p++);
1106 READ_BUF(secinfo->si_namelen);
1107 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1108 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1109 if (status)
1110 return status;
1111 DECODE_TAIL;
1112 }
1113
1114 static __be32
1115 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1116 struct nfsd4_secinfo_no_name *sin)
1117 {
1118 DECODE_HEAD;
1119
1120 READ_BUF(4);
1121 sin->sin_style = be32_to_cpup(p++);
1122 DECODE_TAIL;
1123 }
1124
1125 static __be32
1126 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1127 {
1128 __be32 status;
1129
1130 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1131 if (status)
1132 return status;
1133 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1134 &setattr->sa_acl, &setattr->sa_label);
1135 }
1136
1137 static __be32
1138 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1139 {
1140 DECODE_HEAD;
1141
1142 if (argp->minorversion >= 1)
1143 return nfserr_notsupp;
1144
1145 READ_BUF(NFS4_VERIFIER_SIZE);
1146 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1147
1148 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1149 if (status)
1150 return nfserr_bad_xdr;
1151 READ_BUF(8);
1152 setclientid->se_callback_prog = be32_to_cpup(p++);
1153 setclientid->se_callback_netid_len = be32_to_cpup(p++);
1154
1155 READ_BUF(setclientid->se_callback_netid_len + 4);
1156 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1157 setclientid->se_callback_addr_len = be32_to_cpup(p++);
1158
1159 READ_BUF(setclientid->se_callback_addr_len + 4);
1160 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1161 setclientid->se_callback_ident = be32_to_cpup(p++);
1162
1163 DECODE_TAIL;
1164 }
1165
1166 static __be32
1167 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1168 {
1169 DECODE_HEAD;
1170
1171 if (argp->minorversion >= 1)
1172 return nfserr_notsupp;
1173
1174 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1175 COPYMEM(&scd_c->sc_clientid, 8);
1176 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1177
1178 DECODE_TAIL;
1179 }
1180
1181 /* Also used for NVERIFY */
1182 static __be32
1183 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1184 {
1185 DECODE_HEAD;
1186
1187 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1188 goto out;
1189
1190 /* For convenience's sake, we compare raw xdr'd attributes in
1191 * nfsd4_proc_verify */
1192
1193 READ_BUF(4);
1194 verify->ve_attrlen = be32_to_cpup(p++);
1195 READ_BUF(verify->ve_attrlen);
1196 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1197
1198 DECODE_TAIL;
1199 }
1200
1201 static __be32
1202 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1203 {
1204 int avail;
1205 int len;
1206 DECODE_HEAD;
1207
1208 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1209 if (status)
1210 return status;
1211 READ_BUF(16);
1212 p = xdr_decode_hyper(p, &write->wr_offset);
1213 write->wr_stable_how = be32_to_cpup(p++);
1214 if (write->wr_stable_how > 2)
1215 goto xdr_error;
1216 write->wr_buflen = be32_to_cpup(p++);
1217
1218 /* Sorry .. no magic macros for this.. *
1219 * READ_BUF(write->wr_buflen);
1220 * SAVEMEM(write->wr_buf, write->wr_buflen);
1221 */
1222 avail = (char*)argp->end - (char*)argp->p;
1223 if (avail + argp->pagelen < write->wr_buflen) {
1224 dprintk("NFSD: xdr error (%s:%d)\n",
1225 __FILE__, __LINE__);
1226 goto xdr_error;
1227 }
1228 write->wr_head.iov_base = p;
1229 write->wr_head.iov_len = avail;
1230 write->wr_pagelist = argp->pagelist;
1231
1232 len = XDR_QUADLEN(write->wr_buflen) << 2;
1233 if (len >= avail) {
1234 int pages;
1235
1236 len -= avail;
1237
1238 pages = len >> PAGE_SHIFT;
1239 argp->pagelist += pages;
1240 argp->pagelen -= pages * PAGE_SIZE;
1241 len -= pages * PAGE_SIZE;
1242
1243 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1244 argp->pagelist++;
1245 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1246 }
1247 argp->p += XDR_QUADLEN(len);
1248
1249 DECODE_TAIL;
1250 }
1251
1252 static __be32
1253 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1254 {
1255 DECODE_HEAD;
1256
1257 if (argp->minorversion >= 1)
1258 return nfserr_notsupp;
1259
1260 READ_BUF(12);
1261 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1262 rlockowner->rl_owner.len = be32_to_cpup(p++);
1263 READ_BUF(rlockowner->rl_owner.len);
1264 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1265
1266 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1267 return nfserr_inval;
1268 DECODE_TAIL;
1269 }
1270
1271 static __be32
1272 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1273 struct nfsd4_exchange_id *exid)
1274 {
1275 int dummy, tmp;
1276 DECODE_HEAD;
1277
1278 READ_BUF(NFS4_VERIFIER_SIZE);
1279 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1280
1281 status = nfsd4_decode_opaque(argp, &exid->clname);
1282 if (status)
1283 return nfserr_bad_xdr;
1284
1285 READ_BUF(4);
1286 exid->flags = be32_to_cpup(p++);
1287
1288 /* Ignore state_protect4_a */
1289 READ_BUF(4);
1290 exid->spa_how = be32_to_cpup(p++);
1291 switch (exid->spa_how) {
1292 case SP4_NONE:
1293 break;
1294 case SP4_MACH_CRED:
1295 /* spo_must_enforce */
1296 READ_BUF(4);
1297 dummy = be32_to_cpup(p++);
1298 READ_BUF(dummy * 4);
1299 p += dummy;
1300
1301 /* spo_must_allow */
1302 READ_BUF(4);
1303 dummy = be32_to_cpup(p++);
1304 READ_BUF(dummy * 4);
1305 p += dummy;
1306 break;
1307 case SP4_SSV:
1308 /* ssp_ops */
1309 READ_BUF(4);
1310 dummy = be32_to_cpup(p++);
1311 READ_BUF(dummy * 4);
1312 p += dummy;
1313
1314 READ_BUF(4);
1315 dummy = be32_to_cpup(p++);
1316 READ_BUF(dummy * 4);
1317 p += dummy;
1318
1319 /* ssp_hash_algs<> */
1320 READ_BUF(4);
1321 tmp = be32_to_cpup(p++);
1322 while (tmp--) {
1323 READ_BUF(4);
1324 dummy = be32_to_cpup(p++);
1325 READ_BUF(dummy);
1326 p += XDR_QUADLEN(dummy);
1327 }
1328
1329 /* ssp_encr_algs<> */
1330 READ_BUF(4);
1331 tmp = be32_to_cpup(p++);
1332 while (tmp--) {
1333 READ_BUF(4);
1334 dummy = be32_to_cpup(p++);
1335 READ_BUF(dummy);
1336 p += XDR_QUADLEN(dummy);
1337 }
1338
1339 /* ssp_window and ssp_num_gss_handles */
1340 READ_BUF(8);
1341 dummy = be32_to_cpup(p++);
1342 dummy = be32_to_cpup(p++);
1343 break;
1344 default:
1345 goto xdr_error;
1346 }
1347
1348 /* Ignore Implementation ID */
1349 READ_BUF(4); /* nfs_impl_id4 array length */
1350 dummy = be32_to_cpup(p++);
1351
1352 if (dummy > 1)
1353 goto xdr_error;
1354
1355 if (dummy == 1) {
1356 /* nii_domain */
1357 READ_BUF(4);
1358 dummy = be32_to_cpup(p++);
1359 READ_BUF(dummy);
1360 p += XDR_QUADLEN(dummy);
1361
1362 /* nii_name */
1363 READ_BUF(4);
1364 dummy = be32_to_cpup(p++);
1365 READ_BUF(dummy);
1366 p += XDR_QUADLEN(dummy);
1367
1368 /* nii_date */
1369 READ_BUF(12);
1370 p += 3;
1371 }
1372 DECODE_TAIL;
1373 }
1374
1375 static __be32
1376 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1377 struct nfsd4_create_session *sess)
1378 {
1379 DECODE_HEAD;
1380 u32 dummy;
1381
1382 READ_BUF(16);
1383 COPYMEM(&sess->clientid, 8);
1384 sess->seqid = be32_to_cpup(p++);
1385 sess->flags = be32_to_cpup(p++);
1386
1387 /* Fore channel attrs */
1388 READ_BUF(28);
1389 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1390 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1391 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1392 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1393 sess->fore_channel.maxops = be32_to_cpup(p++);
1394 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1395 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1396 if (sess->fore_channel.nr_rdma_attrs == 1) {
1397 READ_BUF(4);
1398 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1399 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1400 dprintk("Too many fore channel attr bitmaps!\n");
1401 goto xdr_error;
1402 }
1403
1404 /* Back channel attrs */
1405 READ_BUF(28);
1406 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1407 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1408 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1409 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1410 sess->back_channel.maxops = be32_to_cpup(p++);
1411 sess->back_channel.maxreqs = be32_to_cpup(p++);
1412 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1413 if (sess->back_channel.nr_rdma_attrs == 1) {
1414 READ_BUF(4);
1415 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1416 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1417 dprintk("Too many back channel attr bitmaps!\n");
1418 goto xdr_error;
1419 }
1420
1421 READ_BUF(4);
1422 sess->callback_prog = be32_to_cpup(p++);
1423 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1424 DECODE_TAIL;
1425 }
1426
1427 static __be32
1428 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1429 struct nfsd4_destroy_session *destroy_session)
1430 {
1431 DECODE_HEAD;
1432 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1433 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1434
1435 DECODE_TAIL;
1436 }
1437
1438 static __be32
1439 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1440 struct nfsd4_free_stateid *free_stateid)
1441 {
1442 DECODE_HEAD;
1443
1444 READ_BUF(sizeof(stateid_t));
1445 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1446 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1447
1448 DECODE_TAIL;
1449 }
1450
1451 static __be32
1452 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1453 struct nfsd4_sequence *seq)
1454 {
1455 DECODE_HEAD;
1456
1457 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1458 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1459 seq->seqid = be32_to_cpup(p++);
1460 seq->slotid = be32_to_cpup(p++);
1461 seq->maxslots = be32_to_cpup(p++);
1462 seq->cachethis = be32_to_cpup(p++);
1463
1464 DECODE_TAIL;
1465 }
1466
1467 static __be32
1468 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1469 {
1470 int i;
1471 __be32 *p, status;
1472 struct nfsd4_test_stateid_id *stateid;
1473
1474 READ_BUF(4);
1475 test_stateid->ts_num_ids = ntohl(*p++);
1476
1477 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1478
1479 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1480 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1481 if (!stateid) {
1482 status = nfserrno(-ENOMEM);
1483 goto out;
1484 }
1485
1486 INIT_LIST_HEAD(&stateid->ts_id_list);
1487 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1488
1489 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1490 if (status)
1491 goto out;
1492 }
1493
1494 status = 0;
1495 out:
1496 return status;
1497 xdr_error:
1498 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1499 status = nfserr_bad_xdr;
1500 goto out;
1501 }
1502
1503 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1504 {
1505 DECODE_HEAD;
1506
1507 READ_BUF(8);
1508 COPYMEM(&dc->clientid, 8);
1509
1510 DECODE_TAIL;
1511 }
1512
1513 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1514 {
1515 DECODE_HEAD;
1516
1517 READ_BUF(4);
1518 rc->rca_one_fs = be32_to_cpup(p++);
1519
1520 DECODE_TAIL;
1521 }
1522
1523 static __be32
1524 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1525 {
1526 return nfs_ok;
1527 }
1528
1529 static __be32
1530 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1531 {
1532 return nfserr_notsupp;
1533 }
1534
1535 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1536
1537 static nfsd4_dec nfsd4_dec_ops[] = {
1538 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1539 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1540 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1541 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1542 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1543 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1544 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1545 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1546 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1547 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1548 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1549 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1550 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1551 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1552 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1553 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1554 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1555 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1556 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1557 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1558 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1559 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1560 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1561 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1562 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1563 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1564 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1565 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1566 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1567 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1568 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1569 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1570 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1571 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1572 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1573 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1574 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1575
1576 /* new operations for NFSv4.1 */
1577 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1578 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1579 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1580 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1581 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1582 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1583 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1584 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1585 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1586 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1587 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1588 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1589 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1590 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1591 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1592 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1593 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1594 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1595 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1596 };
1597
1598 static inline bool
1599 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1600 {
1601 if (op->opnum < FIRST_NFS4_OP)
1602 return false;
1603 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1604 return false;
1605 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1606 return false;
1607 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1608 return false;
1609 return true;
1610 }
1611
1612 static __be32
1613 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1614 {
1615 DECODE_HEAD;
1616 struct nfsd4_op *op;
1617 bool cachethis = false;
1618 int auth_slack= argp->rqstp->rq_auth_slack;
1619 int max_reply = auth_slack + 8; /* opcnt, status */
1620 int readcount = 0;
1621 int readbytes = 0;
1622 int i;
1623
1624 READ_BUF(4);
1625 argp->taglen = be32_to_cpup(p++);
1626 READ_BUF(argp->taglen + 8);
1627 SAVEMEM(argp->tag, argp->taglen);
1628 argp->minorversion = be32_to_cpup(p++);
1629 argp->opcnt = be32_to_cpup(p++);
1630 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1631
1632 if (argp->taglen > NFSD4_MAX_TAGLEN)
1633 goto xdr_error;
1634 if (argp->opcnt > 100)
1635 goto xdr_error;
1636
1637 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1638 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1639 if (!argp->ops) {
1640 argp->ops = argp->iops;
1641 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1642 goto xdr_error;
1643 }
1644 }
1645
1646 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1647 argp->opcnt = 0;
1648
1649 for (i = 0; i < argp->opcnt; i++) {
1650 op = &argp->ops[i];
1651 op->replay = NULL;
1652
1653 READ_BUF(4);
1654 op->opnum = be32_to_cpup(p++);
1655
1656 if (nfsd4_opnum_in_range(argp, op))
1657 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1658 else {
1659 op->opnum = OP_ILLEGAL;
1660 op->status = nfserr_op_illegal;
1661 }
1662 /*
1663 * We'll try to cache the result in the DRC if any one
1664 * op in the compound wants to be cached:
1665 */
1666 cachethis |= nfsd4_cache_this_op(op);
1667
1668 if (op->opnum == OP_READ) {
1669 readcount++;
1670 readbytes += nfsd4_max_reply(argp->rqstp, op);
1671 } else
1672 max_reply += nfsd4_max_reply(argp->rqstp, op);
1673
1674 if (op->status) {
1675 argp->opcnt = i+1;
1676 break;
1677 }
1678 }
1679 /* Sessions make the DRC unnecessary: */
1680 if (argp->minorversion)
1681 cachethis = false;
1682 svc_reserve(argp->rqstp, max_reply + readbytes);
1683 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1684
1685 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1686 argp->rqstp->rq_splice_ok = false;
1687
1688 DECODE_TAIL;
1689 }
1690
1691 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1692 {
1693 if (IS_I_VERSION(inode)) {
1694 p = xdr_encode_hyper(p, inode->i_version);
1695 } else {
1696 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1697 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1698 }
1699 return p;
1700 }
1701
1702 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1703 {
1704 *p++ = cpu_to_be32(c->atomic);
1705 if (c->change_supported) {
1706 p = xdr_encode_hyper(p, c->before_change);
1707 p = xdr_encode_hyper(p, c->after_change);
1708 } else {
1709 *p++ = cpu_to_be32(c->before_ctime_sec);
1710 *p++ = cpu_to_be32(c->before_ctime_nsec);
1711 *p++ = cpu_to_be32(c->after_ctime_sec);
1712 *p++ = cpu_to_be32(c->after_ctime_nsec);
1713 }
1714 return p;
1715 }
1716
1717 /* Encode as an array of strings the string given with components
1718 * separated @sep, escaped with esc_enter and esc_exit.
1719 */
1720 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1721 char *components, char esc_enter,
1722 char esc_exit)
1723 {
1724 __be32 *p;
1725 __be32 pathlen;
1726 int pathlen_offset;
1727 int strlen, count=0;
1728 char *str, *end, *next;
1729
1730 dprintk("nfsd4_encode_components(%s)\n", components);
1731
1732 pathlen_offset = xdr->buf->len;
1733 p = xdr_reserve_space(xdr, 4);
1734 if (!p)
1735 return nfserr_resource;
1736 p++; /* We will fill this in with @count later */
1737
1738 end = str = components;
1739 while (*end) {
1740 bool found_esc = false;
1741
1742 /* try to parse as esc_start, ..., esc_end, sep */
1743 if (*str == esc_enter) {
1744 for (; *end && (*end != esc_exit); end++)
1745 /* find esc_exit or end of string */;
1746 next = end + 1;
1747 if (*end && (!*next || *next == sep)) {
1748 str++;
1749 found_esc = true;
1750 }
1751 }
1752
1753 if (!found_esc)
1754 for (; *end && (*end != sep); end++)
1755 /* find sep or end of string */;
1756
1757 strlen = end - str;
1758 if (strlen) {
1759 p = xdr_reserve_space(xdr, strlen + 4);
1760 if (!p)
1761 return nfserr_resource;
1762 p = xdr_encode_opaque(p, str, strlen);
1763 count++;
1764 }
1765 else
1766 end++;
1767 str = end;
1768 }
1769 pathlen = htonl(xdr->buf->len - pathlen_offset);
1770 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1771 return 0;
1772 }
1773
1774 /* Encode as an array of strings the string given with components
1775 * separated @sep.
1776 */
1777 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1778 char *components)
1779 {
1780 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1781 }
1782
1783 /*
1784 * encode a location element of a fs_locations structure
1785 */
1786 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1787 struct nfsd4_fs_location *location)
1788 {
1789 __be32 status;
1790
1791 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1792 '[', ']');
1793 if (status)
1794 return status;
1795 status = nfsd4_encode_components(xdr, '/', location->path);
1796 if (status)
1797 return status;
1798 return 0;
1799 }
1800
1801 /*
1802 * Encode a path in RFC3530 'pathname4' format
1803 */
1804 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
1805 const struct path *root,
1806 const struct path *path)
1807 {
1808 struct path cur = *path;
1809 __be32 *p;
1810 struct dentry **components = NULL;
1811 unsigned int ncomponents = 0;
1812 __be32 err = nfserr_jukebox;
1813
1814 dprintk("nfsd4_encode_components(");
1815
1816 path_get(&cur);
1817 /* First walk the path up to the nfsd root, and store the
1818 * dentries/path components in an array.
1819 */
1820 for (;;) {
1821 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1822 break;
1823 if (cur.dentry == cur.mnt->mnt_root) {
1824 if (follow_up(&cur))
1825 continue;
1826 goto out_free;
1827 }
1828 if ((ncomponents & 15) == 0) {
1829 struct dentry **new;
1830 new = krealloc(components,
1831 sizeof(*new) * (ncomponents + 16),
1832 GFP_KERNEL);
1833 if (!new)
1834 goto out_free;
1835 components = new;
1836 }
1837 components[ncomponents++] = cur.dentry;
1838 cur.dentry = dget_parent(cur.dentry);
1839 }
1840 err = nfserr_resource;
1841 p = xdr_reserve_space(xdr, 4);
1842 if (!p)
1843 goto out_free;
1844 *p++ = cpu_to_be32(ncomponents);
1845
1846 while (ncomponents) {
1847 struct dentry *dentry = components[ncomponents - 1];
1848 unsigned int len;
1849
1850 spin_lock(&dentry->d_lock);
1851 len = dentry->d_name.len;
1852 p = xdr_reserve_space(xdr, len + 4);
1853 if (!p) {
1854 spin_unlock(&dentry->d_lock);
1855 goto out_free;
1856 }
1857 p = xdr_encode_opaque(p, dentry->d_name.name, len);
1858 dprintk("/%s", dentry->d_name.name);
1859 spin_unlock(&dentry->d_lock);
1860 dput(dentry);
1861 ncomponents--;
1862 }
1863
1864 err = 0;
1865 out_free:
1866 dprintk(")\n");
1867 while (ncomponents)
1868 dput(components[--ncomponents]);
1869 kfree(components);
1870 path_put(&cur);
1871 return err;
1872 }
1873
1874 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
1875 struct svc_rqst *rqstp, const struct path *path)
1876 {
1877 struct svc_export *exp_ps;
1878 __be32 res;
1879
1880 exp_ps = rqst_find_fsidzero_export(rqstp);
1881 if (IS_ERR(exp_ps))
1882 return nfserrno(PTR_ERR(exp_ps));
1883 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
1884 exp_put(exp_ps);
1885 return res;
1886 }
1887
1888 /*
1889 * encode a fs_locations structure
1890 */
1891 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
1892 struct svc_rqst *rqstp, struct svc_export *exp)
1893 {
1894 __be32 status;
1895 int i;
1896 __be32 *p;
1897 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1898
1899 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1900 if (status)
1901 return status;
1902 p = xdr_reserve_space(xdr, 4);
1903 if (!p)
1904 return nfserr_resource;
1905 *p++ = cpu_to_be32(fslocs->locations_count);
1906 for (i=0; i<fslocs->locations_count; i++) {
1907 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1908 if (status)
1909 return status;
1910 }
1911 return 0;
1912 }
1913
1914 static u32 nfs4_file_type(umode_t mode)
1915 {
1916 switch (mode & S_IFMT) {
1917 case S_IFIFO: return NF4FIFO;
1918 case S_IFCHR: return NF4CHR;
1919 case S_IFDIR: return NF4DIR;
1920 case S_IFBLK: return NF4BLK;
1921 case S_IFLNK: return NF4LNK;
1922 case S_IFREG: return NF4REG;
1923 case S_IFSOCK: return NF4SOCK;
1924 default: return NF4BAD;
1925 };
1926 }
1927
1928 static inline __be32
1929 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1930 struct nfs4_ace *ace)
1931 {
1932 if (ace->whotype != NFS4_ACL_WHO_NAMED)
1933 return nfs4_acl_write_who(xdr, ace->whotype);
1934 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1935 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1936 else
1937 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1938 }
1939
1940 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1941 FATTR4_WORD0_RDATTR_ERROR)
1942 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1943
1944 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1945 static inline __be32
1946 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1947 void *context, int len)
1948 {
1949 __be32 *p;
1950
1951 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
1952 if (!p)
1953 return nfserr_resource;
1954
1955 /*
1956 * For now we use a 0 here to indicate the null translation; in
1957 * the future we may place a call to translation code here.
1958 */
1959 *p++ = cpu_to_be32(0); /* lfs */
1960 *p++ = cpu_to_be32(0); /* pi */
1961 p = xdr_encode_opaque(p, context, len);
1962 return 0;
1963 }
1964 #else
1965 static inline __be32
1966 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1967 void *context, int len)
1968 { return 0; }
1969 #endif
1970
1971 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1972 {
1973 /* As per referral draft: */
1974 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1975 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1976 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1977 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1978 *rdattr_err = NFSERR_MOVED;
1979 else
1980 return nfserr_moved;
1981 }
1982 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1983 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1984 return 0;
1985 }
1986
1987
1988 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
1989 {
1990 struct path path = exp->ex_path;
1991 int err;
1992
1993 path_get(&path);
1994 while (follow_up(&path)) {
1995 if (path.dentry != path.mnt->mnt_root)
1996 break;
1997 }
1998 err = vfs_getattr(&path, stat);
1999 path_put(&path);
2000 return err;
2001 }
2002
2003 /*
2004 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2005 * ourselves.
2006 */
2007 static __be32
2008 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2009 struct svc_export *exp,
2010 struct dentry *dentry, u32 *bmval,
2011 struct svc_rqst *rqstp, int ignore_crossmnt)
2012 {
2013 u32 bmval0 = bmval[0];
2014 u32 bmval1 = bmval[1];
2015 u32 bmval2 = bmval[2];
2016 struct kstat stat;
2017 struct svc_fh *tempfh = NULL;
2018 struct kstatfs statfs;
2019 __be32 *p;
2020 int starting_len = xdr->buf->len;
2021 int attrlen_offset;
2022 __be32 attrlen;
2023 u32 dummy;
2024 u64 dummy64;
2025 u32 rdattr_err = 0;
2026 __be32 status;
2027 int err;
2028 int aclsupport = 0;
2029 struct nfs4_acl *acl = NULL;
2030 void *context = NULL;
2031 int contextlen;
2032 bool contextsupport = false;
2033 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2034 u32 minorversion = resp->cstate.minorversion;
2035 struct path path = {
2036 .mnt = exp->ex_path.mnt,
2037 .dentry = dentry,
2038 };
2039 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2040
2041 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2042 BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2043 BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2044 BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2045
2046 if (exp->ex_fslocs.migrated) {
2047 BUG_ON(bmval[2]);
2048 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2049 if (status)
2050 goto out;
2051 }
2052
2053 err = vfs_getattr(&path, &stat);
2054 if (err)
2055 goto out_nfserr;
2056 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2057 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2058 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2059 FATTR4_WORD1_SPACE_TOTAL))) {
2060 err = vfs_statfs(&path, &statfs);
2061 if (err)
2062 goto out_nfserr;
2063 }
2064 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2065 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2066 status = nfserr_jukebox;
2067 if (!tempfh)
2068 goto out;
2069 fh_init(tempfh, NFS4_FHSIZE);
2070 status = fh_compose(tempfh, exp, dentry, NULL);
2071 if (status)
2072 goto out;
2073 fhp = tempfh;
2074 }
2075 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2076 | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2077 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2078 aclsupport = (err == 0);
2079 if (bmval0 & FATTR4_WORD0_ACL) {
2080 if (err == -EOPNOTSUPP)
2081 bmval0 &= ~FATTR4_WORD0_ACL;
2082 else if (err == -EINVAL) {
2083 status = nfserr_attrnotsupp;
2084 goto out;
2085 } else if (err != 0)
2086 goto out_nfserr;
2087 }
2088 }
2089
2090 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2091 if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2092 bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2093 err = security_inode_getsecctx(dentry->d_inode,
2094 &context, &contextlen);
2095 contextsupport = (err == 0);
2096 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2097 if (err == -EOPNOTSUPP)
2098 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2099 else if (err)
2100 goto out_nfserr;
2101 }
2102 }
2103 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2104
2105 if (bmval2) {
2106 p = xdr_reserve_space(xdr, 16);
2107 if (!p)
2108 goto out_resource;
2109 *p++ = cpu_to_be32(3);
2110 *p++ = cpu_to_be32(bmval0);
2111 *p++ = cpu_to_be32(bmval1);
2112 *p++ = cpu_to_be32(bmval2);
2113 } else if (bmval1) {
2114 p = xdr_reserve_space(xdr, 12);
2115 if (!p)
2116 goto out_resource;
2117 *p++ = cpu_to_be32(2);
2118 *p++ = cpu_to_be32(bmval0);
2119 *p++ = cpu_to_be32(bmval1);
2120 } else {
2121 p = xdr_reserve_space(xdr, 8);
2122 if (!p)
2123 goto out_resource;
2124 *p++ = cpu_to_be32(1);
2125 *p++ = cpu_to_be32(bmval0);
2126 }
2127
2128 attrlen_offset = xdr->buf->len;
2129 p = xdr_reserve_space(xdr, 4);
2130 if (!p)
2131 goto out_resource;
2132 p++; /* to be backfilled later */
2133
2134 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2135 u32 word0 = nfsd_suppattrs0(minorversion);
2136 u32 word1 = nfsd_suppattrs1(minorversion);
2137 u32 word2 = nfsd_suppattrs2(minorversion);
2138
2139 if (!aclsupport)
2140 word0 &= ~FATTR4_WORD0_ACL;
2141 if (!contextsupport)
2142 word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2143 if (!word2) {
2144 p = xdr_reserve_space(xdr, 12);
2145 if (!p)
2146 goto out_resource;
2147 *p++ = cpu_to_be32(2);
2148 *p++ = cpu_to_be32(word0);
2149 *p++ = cpu_to_be32(word1);
2150 } else {
2151 p = xdr_reserve_space(xdr, 16);
2152 if (!p)
2153 goto out_resource;
2154 *p++ = cpu_to_be32(3);
2155 *p++ = cpu_to_be32(word0);
2156 *p++ = cpu_to_be32(word1);
2157 *p++ = cpu_to_be32(word2);
2158 }
2159 }
2160 if (bmval0 & FATTR4_WORD0_TYPE) {
2161 p = xdr_reserve_space(xdr, 4);
2162 if (!p)
2163 goto out_resource;
2164 dummy = nfs4_file_type(stat.mode);
2165 if (dummy == NF4BAD) {
2166 status = nfserr_serverfault;
2167 goto out;
2168 }
2169 *p++ = cpu_to_be32(dummy);
2170 }
2171 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2172 p = xdr_reserve_space(xdr, 4);
2173 if (!p)
2174 goto out_resource;
2175 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2176 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2177 else
2178 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2179 NFS4_FH_VOL_RENAME);
2180 }
2181 if (bmval0 & FATTR4_WORD0_CHANGE) {
2182 p = xdr_reserve_space(xdr, 8);
2183 if (!p)
2184 goto out_resource;
2185 p = encode_change(p, &stat, dentry->d_inode);
2186 }
2187 if (bmval0 & FATTR4_WORD0_SIZE) {
2188 p = xdr_reserve_space(xdr, 8);
2189 if (!p)
2190 goto out_resource;
2191 p = xdr_encode_hyper(p, stat.size);
2192 }
2193 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2194 p = xdr_reserve_space(xdr, 4);
2195 if (!p)
2196 goto out_resource;
2197 *p++ = cpu_to_be32(1);
2198 }
2199 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2200 p = xdr_reserve_space(xdr, 4);
2201 if (!p)
2202 goto out_resource;
2203 *p++ = cpu_to_be32(1);
2204 }
2205 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2206 p = xdr_reserve_space(xdr, 4);
2207 if (!p)
2208 goto out_resource;
2209 *p++ = cpu_to_be32(0);
2210 }
2211 if (bmval0 & FATTR4_WORD0_FSID) {
2212 p = xdr_reserve_space(xdr, 16);
2213 if (!p)
2214 goto out_resource;
2215 if (exp->ex_fslocs.migrated) {
2216 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2217 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2218 } else switch(fsid_source(fhp)) {
2219 case FSIDSOURCE_FSID:
2220 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2221 p = xdr_encode_hyper(p, (u64)0);
2222 break;
2223 case FSIDSOURCE_DEV:
2224 *p++ = cpu_to_be32(0);
2225 *p++ = cpu_to_be32(MAJOR(stat.dev));
2226 *p++ = cpu_to_be32(0);
2227 *p++ = cpu_to_be32(MINOR(stat.dev));
2228 break;
2229 case FSIDSOURCE_UUID:
2230 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2231 EX_UUID_LEN);
2232 break;
2233 }
2234 }
2235 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2236 p = xdr_reserve_space(xdr, 4);
2237 if (!p)
2238 goto out_resource;
2239 *p++ = cpu_to_be32(0);
2240 }
2241 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2242 p = xdr_reserve_space(xdr, 4);
2243 if (!p)
2244 goto out_resource;
2245 *p++ = cpu_to_be32(nn->nfsd4_lease);
2246 }
2247 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2248 p = xdr_reserve_space(xdr, 4);
2249 if (!p)
2250 goto out_resource;
2251 *p++ = cpu_to_be32(rdattr_err);
2252 }
2253 if (bmval0 & FATTR4_WORD0_ACL) {
2254 struct nfs4_ace *ace;
2255
2256 if (acl == NULL) {
2257 p = xdr_reserve_space(xdr, 4);
2258 if (!p)
2259 goto out_resource;
2260
2261 *p++ = cpu_to_be32(0);
2262 goto out_acl;
2263 }
2264 p = xdr_reserve_space(xdr, 4);
2265 if (!p)
2266 goto out_resource;
2267 *p++ = cpu_to_be32(acl->naces);
2268
2269 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2270 p = xdr_reserve_space(xdr, 4*3);
2271 if (!p)
2272 goto out_resource;
2273 *p++ = cpu_to_be32(ace->type);
2274 *p++ = cpu_to_be32(ace->flag);
2275 *p++ = cpu_to_be32(ace->access_mask &
2276 NFS4_ACE_MASK_ALL);
2277 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2278 if (status)
2279 goto out;
2280 }
2281 }
2282 out_acl:
2283 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2284 p = xdr_reserve_space(xdr, 4);
2285 if (!p)
2286 goto out_resource;
2287 *p++ = cpu_to_be32(aclsupport ?
2288 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2289 }
2290 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2291 p = xdr_reserve_space(xdr, 4);
2292 if (!p)
2293 goto out_resource;
2294 *p++ = cpu_to_be32(1);
2295 }
2296 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2297 p = xdr_reserve_space(xdr, 4);
2298 if (!p)
2299 goto out_resource;
2300 *p++ = cpu_to_be32(0);
2301 }
2302 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2303 p = xdr_reserve_space(xdr, 4);
2304 if (!p)
2305 goto out_resource;
2306 *p++ = cpu_to_be32(1);
2307 }
2308 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2309 p = xdr_reserve_space(xdr, 4);
2310 if (!p)
2311 goto out_resource;
2312 *p++ = cpu_to_be32(1);
2313 }
2314 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2315 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2316 if (!p)
2317 goto out_resource;
2318 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2319 fhp->fh_handle.fh_size);
2320 }
2321 if (bmval0 & FATTR4_WORD0_FILEID) {
2322 p = xdr_reserve_space(xdr, 8);
2323 if (!p)
2324 goto out_resource;
2325 p = xdr_encode_hyper(p, stat.ino);
2326 }
2327 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2328 p = xdr_reserve_space(xdr, 8);
2329 if (!p)
2330 goto out_resource;
2331 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2332 }
2333 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2334 p = xdr_reserve_space(xdr, 8);
2335 if (!p)
2336 goto out_resource;
2337 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2338 }
2339 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2340 p = xdr_reserve_space(xdr, 8);
2341 if (!p)
2342 goto out_resource;
2343 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2344 }
2345 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2346 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2347 if (status)
2348 goto out;
2349 }
2350 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2351 p = xdr_reserve_space(xdr, 4);
2352 if (!p)
2353 goto out_resource;
2354 *p++ = cpu_to_be32(1);
2355 }
2356 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2357 p = xdr_reserve_space(xdr, 8);
2358 if (!p)
2359 goto out_resource;
2360 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2361 }
2362 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2363 p = xdr_reserve_space(xdr, 4);
2364 if (!p)
2365 goto out_resource;
2366 *p++ = cpu_to_be32(255);
2367 }
2368 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2369 p = xdr_reserve_space(xdr, 4);
2370 if (!p)
2371 goto out_resource;
2372 *p++ = cpu_to_be32(statfs.f_namelen);
2373 }
2374 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2375 p = xdr_reserve_space(xdr, 8);
2376 if (!p)
2377 goto out_resource;
2378 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2379 }
2380 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2381 p = xdr_reserve_space(xdr, 8);
2382 if (!p)
2383 goto out_resource;
2384 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2385 }
2386 if (bmval1 & FATTR4_WORD1_MODE) {
2387 p = xdr_reserve_space(xdr, 4);
2388 if (!p)
2389 goto out_resource;
2390 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2391 }
2392 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2393 p = xdr_reserve_space(xdr, 4);
2394 if (!p)
2395 goto out_resource;
2396 *p++ = cpu_to_be32(1);
2397 }
2398 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2399 p = xdr_reserve_space(xdr, 4);
2400 if (!p)
2401 goto out_resource;
2402 *p++ = cpu_to_be32(stat.nlink);
2403 }
2404 if (bmval1 & FATTR4_WORD1_OWNER) {
2405 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2406 if (status)
2407 goto out;
2408 }
2409 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2410 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2411 if (status)
2412 goto out;
2413 }
2414 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2415 p = xdr_reserve_space(xdr, 8);
2416 if (!p)
2417 goto out_resource;
2418 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2419 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2420 }
2421 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2422 p = xdr_reserve_space(xdr, 8);
2423 if (!p)
2424 goto out_resource;
2425 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2426 p = xdr_encode_hyper(p, dummy64);
2427 }
2428 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2429 p = xdr_reserve_space(xdr, 8);
2430 if (!p)
2431 goto out_resource;
2432 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2433 p = xdr_encode_hyper(p, dummy64);
2434 }
2435 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2436 p = xdr_reserve_space(xdr, 8);
2437 if (!p)
2438 goto out_resource;
2439 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2440 p = xdr_encode_hyper(p, dummy64);
2441 }
2442 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2443 p = xdr_reserve_space(xdr, 8);
2444 if (!p)
2445 goto out_resource;
2446 dummy64 = (u64)stat.blocks << 9;
2447 p = xdr_encode_hyper(p, dummy64);
2448 }
2449 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2450 p = xdr_reserve_space(xdr, 12);
2451 if (!p)
2452 goto out_resource;
2453 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2454 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2455 }
2456 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2457 p = xdr_reserve_space(xdr, 12);
2458 if (!p)
2459 goto out_resource;
2460 *p++ = cpu_to_be32(0);
2461 *p++ = cpu_to_be32(1);
2462 *p++ = cpu_to_be32(0);
2463 }
2464 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2465 p = xdr_reserve_space(xdr, 12);
2466 if (!p)
2467 goto out_resource;
2468 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2469 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2470 }
2471 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2472 p = xdr_reserve_space(xdr, 12);
2473 if (!p)
2474 goto out_resource;
2475 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2476 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2477 }
2478 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2479 p = xdr_reserve_space(xdr, 8);
2480 if (!p)
2481 goto out_resource;
2482 /*
2483 * Get parent's attributes if not ignoring crossmount
2484 * and this is the root of a cross-mounted filesystem.
2485 */
2486 if (ignore_crossmnt == 0 &&
2487 dentry == exp->ex_path.mnt->mnt_root)
2488 get_parent_attributes(exp, &stat);
2489 p = xdr_encode_hyper(p, stat.ino);
2490 }
2491 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2492 status = nfsd4_encode_security_label(xdr, rqstp, context,
2493 contextlen);
2494 if (status)
2495 goto out;
2496 }
2497 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2498 p = xdr_reserve_space(xdr, 16);
2499 if (!p)
2500 goto out_resource;
2501 *p++ = cpu_to_be32(3);
2502 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2503 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2504 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2505 }
2506
2507 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2508 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2509 status = nfs_ok;
2510
2511 out:
2512 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2513 if (context)
2514 security_release_secctx(context, contextlen);
2515 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2516 kfree(acl);
2517 if (tempfh) {
2518 fh_put(tempfh);
2519 kfree(tempfh);
2520 }
2521 if (status)
2522 xdr_truncate_encode(xdr, starting_len);
2523 return status;
2524 out_nfserr:
2525 status = nfserrno(err);
2526 goto out;
2527 out_resource:
2528 status = nfserr_resource;
2529 goto out;
2530 }
2531
2532 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2533 struct xdr_buf *buf, __be32 *p, int bytes)
2534 {
2535 xdr->scratch.iov_len = 0;
2536 memset(buf, 0, sizeof(struct xdr_buf));
2537 buf->head[0].iov_base = p;
2538 buf->head[0].iov_len = 0;
2539 buf->len = 0;
2540 xdr->buf = buf;
2541 xdr->iov = buf->head;
2542 xdr->p = p;
2543 xdr->end = (void *)p + bytes;
2544 buf->buflen = bytes;
2545 }
2546
2547 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2548 struct svc_fh *fhp, struct svc_export *exp,
2549 struct dentry *dentry, u32 *bmval,
2550 struct svc_rqst *rqstp, int ignore_crossmnt)
2551 {
2552 struct xdr_buf dummy;
2553 struct xdr_stream xdr;
2554 __be32 ret;
2555
2556 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2557 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2558 ignore_crossmnt);
2559 *p = xdr.p;
2560 return ret;
2561 }
2562
2563 static inline int attributes_need_mount(u32 *bmval)
2564 {
2565 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2566 return 1;
2567 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2568 return 1;
2569 return 0;
2570 }
2571
2572 static __be32
2573 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2574 const char *name, int namlen)
2575 {
2576 struct svc_export *exp = cd->rd_fhp->fh_export;
2577 struct dentry *dentry;
2578 __be32 nfserr;
2579 int ignore_crossmnt = 0;
2580
2581 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2582 if (IS_ERR(dentry))
2583 return nfserrno(PTR_ERR(dentry));
2584 if (!dentry->d_inode) {
2585 /*
2586 * nfsd_buffered_readdir drops the i_mutex between
2587 * readdir and calling this callback, leaving a window
2588 * where this directory entry could have gone away.
2589 */
2590 dput(dentry);
2591 return nfserr_noent;
2592 }
2593
2594 exp_get(exp);
2595 /*
2596 * In the case of a mountpoint, the client may be asking for
2597 * attributes that are only properties of the underlying filesystem
2598 * as opposed to the cross-mounted file system. In such a case,
2599 * we will not follow the cross mount and will fill the attribtutes
2600 * directly from the mountpoint dentry.
2601 */
2602 if (nfsd_mountpoint(dentry, exp)) {
2603 int err;
2604
2605 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2606 && !attributes_need_mount(cd->rd_bmval)) {
2607 ignore_crossmnt = 1;
2608 goto out_encode;
2609 }
2610 /*
2611 * Why the heck aren't we just using nfsd_lookup??
2612 * Different "."/".." handling? Something else?
2613 * At least, add a comment here to explain....
2614 */
2615 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2616 if (err) {
2617 nfserr = nfserrno(err);
2618 goto out_put;
2619 }
2620 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2621 if (nfserr)
2622 goto out_put;
2623
2624 }
2625 out_encode:
2626 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2627 cd->rd_rqstp, ignore_crossmnt);
2628 out_put:
2629 dput(dentry);
2630 exp_put(exp);
2631 return nfserr;
2632 }
2633
2634 static __be32 *
2635 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2636 {
2637 __be32 *p;
2638
2639 p = xdr_reserve_space(xdr, 20);
2640 if (!p)
2641 return NULL;
2642 *p++ = htonl(2);
2643 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2644 *p++ = htonl(0); /* bmval1 */
2645
2646 *p++ = htonl(4); /* attribute length */
2647 *p++ = nfserr; /* no htonl */
2648 return p;
2649 }
2650
2651 static int
2652 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2653 loff_t offset, u64 ino, unsigned int d_type)
2654 {
2655 struct readdir_cd *ccd = ccdv;
2656 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2657 struct xdr_stream *xdr = cd->xdr;
2658 int start_offset = xdr->buf->len;
2659 int cookie_offset;
2660 int entry_bytes;
2661 __be32 nfserr = nfserr_toosmall;
2662 __be64 wire_offset;
2663 __be32 *p;
2664
2665 /* In nfsv4, "." and ".." never make it onto the wire.. */
2666 if (name && isdotent(name, namlen)) {
2667 cd->common.err = nfs_ok;
2668 return 0;
2669 }
2670
2671 if (cd->cookie_offset) {
2672 wire_offset = cpu_to_be64(offset);
2673 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2674 &wire_offset, 8);
2675 }
2676
2677 p = xdr_reserve_space(xdr, 4);
2678 if (!p)
2679 goto fail;
2680 *p++ = xdr_one; /* mark entry present */
2681 cookie_offset = xdr->buf->len;
2682 p = xdr_reserve_space(xdr, 3*4 + namlen);
2683 if (!p)
2684 goto fail;
2685 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
2686 p = xdr_encode_array(p, name, namlen); /* name length & name */
2687
2688 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2689 switch (nfserr) {
2690 case nfs_ok:
2691 break;
2692 case nfserr_resource:
2693 nfserr = nfserr_toosmall;
2694 goto fail;
2695 case nfserr_noent:
2696 xdr_truncate_encode(xdr, start_offset);
2697 goto skip_entry;
2698 default:
2699 /*
2700 * If the client requested the RDATTR_ERROR attribute,
2701 * we stuff the error code into this attribute
2702 * and continue. If this attribute was not requested,
2703 * then in accordance with the spec, we fail the
2704 * entire READDIR operation(!)
2705 */
2706 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2707 goto fail;
2708 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2709 if (p == NULL) {
2710 nfserr = nfserr_toosmall;
2711 goto fail;
2712 }
2713 }
2714 nfserr = nfserr_toosmall;
2715 entry_bytes = xdr->buf->len - start_offset;
2716 if (entry_bytes > cd->rd_maxcount)
2717 goto fail;
2718 cd->rd_maxcount -= entry_bytes;
2719 if (!cd->rd_dircount)
2720 goto fail;
2721 cd->rd_dircount--;
2722 cd->cookie_offset = cookie_offset;
2723 skip_entry:
2724 cd->common.err = nfs_ok;
2725 return 0;
2726 fail:
2727 xdr_truncate_encode(xdr, start_offset);
2728 cd->common.err = nfserr;
2729 return -EINVAL;
2730 }
2731
2732 static __be32
2733 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2734 {
2735 __be32 *p;
2736
2737 p = xdr_reserve_space(xdr, sizeof(stateid_t));
2738 if (!p)
2739 return nfserr_resource;
2740 *p++ = cpu_to_be32(sid->si_generation);
2741 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
2742 sizeof(stateid_opaque_t));
2743 return 0;
2744 }
2745
2746 static __be32
2747 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2748 {
2749 struct xdr_stream *xdr = &resp->xdr;
2750 __be32 *p;
2751
2752 if (!nfserr) {
2753 p = xdr_reserve_space(xdr, 8);
2754 if (!p)
2755 return nfserr_resource;
2756 *p++ = cpu_to_be32(access->ac_supported);
2757 *p++ = cpu_to_be32(access->ac_resp_access);
2758 }
2759 return nfserr;
2760 }
2761
2762 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2763 {
2764 struct xdr_stream *xdr = &resp->xdr;
2765 __be32 *p;
2766
2767 if (!nfserr) {
2768 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
2769 if (!p)
2770 return nfserr_resource;
2771 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
2772 NFS4_MAX_SESSIONID_LEN);
2773 *p++ = cpu_to_be32(bcts->dir);
2774 /* Sorry, we do not yet support RDMA over 4.1: */
2775 *p++ = cpu_to_be32(0);
2776 }
2777 return nfserr;
2778 }
2779
2780 static __be32
2781 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2782 {
2783 struct xdr_stream *xdr = &resp->xdr;
2784
2785 if (!nfserr)
2786 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2787
2788 return nfserr;
2789 }
2790
2791
2792 static __be32
2793 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2794 {
2795 struct xdr_stream *xdr = &resp->xdr;
2796 __be32 *p;
2797
2798 if (!nfserr) {
2799 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
2800 if (!p)
2801 return nfserr_resource;
2802 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
2803 NFS4_VERIFIER_SIZE);
2804 }
2805 return nfserr;
2806 }
2807
2808 static __be32
2809 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2810 {
2811 struct xdr_stream *xdr = &resp->xdr;
2812 __be32 *p;
2813
2814 if (!nfserr) {
2815 p = xdr_reserve_space(xdr, 32);
2816 if (!p)
2817 return nfserr_resource;
2818 p = encode_cinfo(p, &create->cr_cinfo);
2819 *p++ = cpu_to_be32(2);
2820 *p++ = cpu_to_be32(create->cr_bmval[0]);
2821 *p++ = cpu_to_be32(create->cr_bmval[1]);
2822 }
2823 return nfserr;
2824 }
2825
2826 static __be32
2827 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2828 {
2829 struct svc_fh *fhp = getattr->ga_fhp;
2830 struct xdr_stream *xdr = &resp->xdr;
2831
2832 if (nfserr)
2833 return nfserr;
2834
2835 nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
2836 getattr->ga_bmval,
2837 resp->rqstp, 0);
2838 return nfserr;
2839 }
2840
2841 static __be32
2842 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2843 {
2844 struct xdr_stream *xdr = &resp->xdr;
2845 struct svc_fh *fhp = *fhpp;
2846 unsigned int len;
2847 __be32 *p;
2848
2849 if (!nfserr) {
2850 len = fhp->fh_handle.fh_size;
2851 p = xdr_reserve_space(xdr, len + 4);
2852 if (!p)
2853 return nfserr_resource;
2854 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
2855 }
2856 return nfserr;
2857 }
2858
2859 /*
2860 * Including all fields other than the name, a LOCK4denied structure requires
2861 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2862 */
2863 static __be32
2864 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
2865 {
2866 struct xdr_netobj *conf = &ld->ld_owner;
2867 __be32 *p;
2868
2869 again:
2870 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2871 if (!p) {
2872 /*
2873 * Don't fail to return the result just because we can't
2874 * return the conflicting open:
2875 */
2876 if (conf->len) {
2877 kfree(conf->data);
2878 conf->len = 0;
2879 conf->data = NULL;
2880 goto again;
2881 }
2882 return nfserr_resource;
2883 }
2884 p = xdr_encode_hyper(p, ld->ld_start);
2885 p = xdr_encode_hyper(p, ld->ld_length);
2886 *p++ = cpu_to_be32(ld->ld_type);
2887 if (conf->len) {
2888 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
2889 p = xdr_encode_opaque(p, conf->data, conf->len);
2890 kfree(conf->data);
2891 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
2892 p = xdr_encode_hyper(p, (u64)0); /* clientid */
2893 *p++ = cpu_to_be32(0); /* length of owner name */
2894 }
2895 return nfserr_denied;
2896 }
2897
2898 static __be32
2899 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2900 {
2901 struct xdr_stream *xdr = &resp->xdr;
2902
2903 if (!nfserr)
2904 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2905 else if (nfserr == nfserr_denied)
2906 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2907
2908 return nfserr;
2909 }
2910
2911 static __be32
2912 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2913 {
2914 struct xdr_stream *xdr = &resp->xdr;
2915
2916 if (nfserr == nfserr_denied)
2917 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2918 return nfserr;
2919 }
2920
2921 static __be32
2922 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2923 {
2924 struct xdr_stream *xdr = &resp->xdr;
2925
2926 if (!nfserr)
2927 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2928
2929 return nfserr;
2930 }
2931
2932
2933 static __be32
2934 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2935 {
2936 struct xdr_stream *xdr = &resp->xdr;
2937 __be32 *p;
2938
2939 if (!nfserr) {
2940 p = xdr_reserve_space(xdr, 20);
2941 if (!p)
2942 return nfserr_resource;
2943 p = encode_cinfo(p, &link->li_cinfo);
2944 }
2945 return nfserr;
2946 }
2947
2948
2949 static __be32
2950 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2951 {
2952 struct xdr_stream *xdr = &resp->xdr;
2953 __be32 *p;
2954
2955 if (nfserr)
2956 goto out;
2957
2958 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
2959 if (nfserr)
2960 goto out;
2961 p = xdr_reserve_space(xdr, 40);
2962 if (!p)
2963 return nfserr_resource;
2964 p = encode_cinfo(p, &open->op_cinfo);
2965 *p++ = cpu_to_be32(open->op_rflags);
2966 *p++ = cpu_to_be32(2);
2967 *p++ = cpu_to_be32(open->op_bmval[0]);
2968 *p++ = cpu_to_be32(open->op_bmval[1]);
2969 *p++ = cpu_to_be32(open->op_delegate_type);
2970
2971 switch (open->op_delegate_type) {
2972 case NFS4_OPEN_DELEGATE_NONE:
2973 break;
2974 case NFS4_OPEN_DELEGATE_READ:
2975 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
2976 if (nfserr)
2977 return nfserr;
2978 p = xdr_reserve_space(xdr, 20);
2979 if (!p)
2980 return nfserr_resource;
2981 *p++ = cpu_to_be32(open->op_recall);
2982
2983 /*
2984 * TODO: ACE's in delegations
2985 */
2986 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2987 *p++ = cpu_to_be32(0);
2988 *p++ = cpu_to_be32(0);
2989 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
2990 break;
2991 case NFS4_OPEN_DELEGATE_WRITE:
2992 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
2993 if (nfserr)
2994 return nfserr;
2995 p = xdr_reserve_space(xdr, 32);
2996 if (!p)
2997 return nfserr_resource;
2998 *p++ = cpu_to_be32(0);
2999
3000 /*
3001 * TODO: space_limit's in delegations
3002 */
3003 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3004 *p++ = cpu_to_be32(~(u32)0);
3005 *p++ = cpu_to_be32(~(u32)0);
3006
3007 /*
3008 * TODO: ACE's in delegations
3009 */
3010 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3011 *p++ = cpu_to_be32(0);
3012 *p++ = cpu_to_be32(0);
3013 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3014 break;
3015 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3016 switch (open->op_why_no_deleg) {
3017 case WND4_CONTENTION:
3018 case WND4_RESOURCE:
3019 p = xdr_reserve_space(xdr, 8);
3020 if (!p)
3021 return nfserr_resource;
3022 *p++ = cpu_to_be32(open->op_why_no_deleg);
3023 /* deleg signaling not supported yet: */
3024 *p++ = cpu_to_be32(0);
3025 break;
3026 default:
3027 p = xdr_reserve_space(xdr, 4);
3028 if (!p)
3029 return nfserr_resource;
3030 *p++ = cpu_to_be32(open->op_why_no_deleg);
3031 }
3032 break;
3033 default:
3034 BUG();
3035 }
3036 /* XXX save filehandle here */
3037 out:
3038 return nfserr;
3039 }
3040
3041 static __be32
3042 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3043 {
3044 struct xdr_stream *xdr = &resp->xdr;
3045
3046 if (!nfserr)
3047 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3048
3049 return nfserr;
3050 }
3051
3052 static __be32
3053 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3054 {
3055 struct xdr_stream *xdr = &resp->xdr;
3056
3057 if (!nfserr)
3058 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3059
3060 return nfserr;
3061 }
3062
3063 static __be32 nfsd4_encode_splice_read(
3064 struct nfsd4_compoundres *resp,
3065 struct nfsd4_read *read,
3066 struct file *file, unsigned long maxcount)
3067 {
3068 struct xdr_stream *xdr = &resp->xdr;
3069 struct xdr_buf *buf = xdr->buf;
3070 u32 eof;
3071 int space_left;
3072 __be32 nfserr;
3073 __be32 *p = xdr->p - 2;
3074
3075 /* Make sure there will be room for padding if needed */
3076 if (xdr->end - xdr->p < 1)
3077 return nfserr_resource;
3078
3079 nfserr = nfsd_splice_read(read->rd_rqstp, file,
3080 read->rd_offset, &maxcount);
3081 if (nfserr) {
3082 /*
3083 * nfsd_splice_actor may have already messed with the
3084 * page length; reset it so as not to confuse
3085 * xdr_truncate_encode:
3086 */
3087 buf->page_len = 0;
3088 return nfserr;
3089 }
3090
3091 eof = (read->rd_offset + maxcount >=
3092 read->rd_fhp->fh_dentry->d_inode->i_size);
3093
3094 *(p++) = htonl(eof);
3095 *(p++) = htonl(maxcount);
3096
3097 buf->page_len = maxcount;
3098 buf->len += maxcount;
3099 xdr->page_ptr += (maxcount + PAGE_SIZE - 1) / PAGE_SIZE;
3100
3101 /* Use rest of head for padding and remaining ops: */
3102 buf->tail[0].iov_base = xdr->p;
3103 buf->tail[0].iov_len = 0;
3104 xdr->iov = buf->tail;
3105 if (maxcount&3) {
3106 int pad = 4 - (maxcount&3);
3107
3108 *(xdr->p++) = 0;
3109
3110 buf->tail[0].iov_base += maxcount&3;
3111 buf->tail[0].iov_len = pad;
3112 buf->len += pad;
3113 }
3114
3115 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3116 buf->buflen - buf->len);
3117 buf->buflen = buf->len + space_left;
3118 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3119
3120 return 0;
3121 }
3122
3123 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3124 struct nfsd4_read *read,
3125 struct file *file, unsigned long maxcount)
3126 {
3127 struct xdr_stream *xdr = &resp->xdr;
3128 u32 eof;
3129 int v;
3130 int starting_len = xdr->buf->len - 8;
3131 long len;
3132 int thislen;
3133 __be32 nfserr;
3134 __be32 tmp;
3135 __be32 *p;
3136 u32 zzz = 0;
3137 int pad;
3138
3139 len = maxcount;
3140 v = 0;
3141
3142 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3143 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3144 WARN_ON_ONCE(!p);
3145 resp->rqstp->rq_vec[v].iov_base = p;
3146 resp->rqstp->rq_vec[v].iov_len = thislen;
3147 v++;
3148 len -= thislen;
3149
3150 while (len) {
3151 thislen = min_t(long, len, PAGE_SIZE);
3152 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3153 WARN_ON_ONCE(!p);
3154 resp->rqstp->rq_vec[v].iov_base = p;
3155 resp->rqstp->rq_vec[v].iov_len = thislen;
3156 v++;
3157 len -= thislen;
3158 }
3159 read->rd_vlen = v;
3160
3161 nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3162 read->rd_vlen, &maxcount);
3163 if (nfserr)
3164 return nfserr;
3165 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3166
3167 eof = (read->rd_offset + maxcount >=
3168 read->rd_fhp->fh_dentry->d_inode->i_size);
3169
3170 tmp = htonl(eof);
3171 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3172 tmp = htonl(maxcount);
3173 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3174
3175 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3176 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3177 &zzz, pad);
3178 return 0;
3179
3180 }
3181
3182 static __be32
3183 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3184 struct nfsd4_read *read)
3185 {
3186 unsigned long maxcount;
3187 struct xdr_stream *xdr = &resp->xdr;
3188 struct file *file = read->rd_filp;
3189 int starting_len = xdr->buf->len;
3190 struct raparms *ra;
3191 __be32 *p;
3192 __be32 err;
3193
3194 if (nfserr)
3195 return nfserr;
3196
3197 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3198 if (!p) {
3199 WARN_ON_ONCE(resp->rqstp->rq_splice_ok);
3200 return nfserr_resource;
3201 }
3202 if (resp->xdr.buf->page_len && resp->rqstp->rq_splice_ok) {
3203 WARN_ON_ONCE(1);
3204 return nfserr_resource;
3205 }
3206 xdr_commit_encode(xdr);
3207
3208 maxcount = svc_max_payload(resp->rqstp);
3209 maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len));
3210 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3211
3212 if (!read->rd_filp) {
3213 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
3214 &file, &ra);
3215 if (err)
3216 goto err_truncate;
3217 }
3218
3219 if (file->f_op->splice_read && resp->rqstp->rq_splice_ok)
3220 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
3221 else
3222 err = nfsd4_encode_readv(resp, read, file, maxcount);
3223
3224 if (!read->rd_filp)
3225 nfsd_put_tmp_read_open(file, ra);
3226
3227 err_truncate:
3228 if (err)
3229 xdr_truncate_encode(xdr, starting_len);
3230 return err;
3231 }
3232
3233 static __be32
3234 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3235 {
3236 int maxcount;
3237 __be32 wire_count;
3238 int zero = 0;
3239 struct xdr_stream *xdr = &resp->xdr;
3240 int length_offset = xdr->buf->len;
3241 __be32 *p;
3242
3243 if (nfserr)
3244 return nfserr;
3245
3246 p = xdr_reserve_space(xdr, 4);
3247 if (!p)
3248 return nfserr_resource;
3249 maxcount = PAGE_SIZE;
3250
3251 p = xdr_reserve_space(xdr, maxcount);
3252 if (!p)
3253 return nfserr_resource;
3254 /*
3255 * XXX: By default, the ->readlink() VFS op will truncate symlinks
3256 * if they would overflow the buffer. Is this kosher in NFSv4? If
3257 * not, one easy fix is: if ->readlink() precisely fills the buffer,
3258 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3259 */
3260 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3261 (char *)p, &maxcount);
3262 if (nfserr == nfserr_isdir)
3263 nfserr = nfserr_inval;
3264 if (nfserr) {
3265 xdr_truncate_encode(xdr, length_offset);
3266 return nfserr;
3267 }
3268
3269 wire_count = htonl(maxcount);
3270 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3271 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3272 if (maxcount & 3)
3273 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3274 &zero, 4 - (maxcount&3));
3275 return 0;
3276 }
3277
3278 static __be32
3279 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3280 {
3281 int maxcount;
3282 int bytes_left;
3283 loff_t offset;
3284 __be64 wire_offset;
3285 struct xdr_stream *xdr = &resp->xdr;
3286 int starting_len = xdr->buf->len;
3287 __be32 *p;
3288
3289 if (nfserr)
3290 return nfserr;
3291
3292 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3293 if (!p)
3294 return nfserr_resource;
3295
3296 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3297 *p++ = cpu_to_be32(0);
3298 *p++ = cpu_to_be32(0);
3299 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3300 - (char *)resp->xdr.buf->head[0].iov_base;
3301
3302 /*
3303 * Number of bytes left for directory entries allowing for the
3304 * final 8 bytes of the readdir and a following failed op:
3305 */
3306 bytes_left = xdr->buf->buflen - xdr->buf->len
3307 - COMPOUND_ERR_SLACK_SPACE - 8;
3308 if (bytes_left < 0) {
3309 nfserr = nfserr_resource;
3310 goto err_no_verf;
3311 }
3312 maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3313 /*
3314 * Note the rfc defines rd_maxcount as the size of the
3315 * READDIR4resok structure, which includes the verifier above
3316 * and the 8 bytes encoded at the end of this function:
3317 */
3318 if (maxcount < 16) {
3319 nfserr = nfserr_toosmall;
3320 goto err_no_verf;
3321 }
3322 maxcount = min_t(int, maxcount-16, bytes_left);
3323
3324 readdir->xdr = xdr;
3325 readdir->rd_maxcount = maxcount;
3326 readdir->common.err = 0;
3327 readdir->cookie_offset = 0;
3328
3329 offset = readdir->rd_cookie;
3330 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3331 &offset,
3332 &readdir->common, nfsd4_encode_dirent);
3333 if (nfserr == nfs_ok &&
3334 readdir->common.err == nfserr_toosmall &&
3335 xdr->buf->len == starting_len + 8) {
3336 /* nothing encoded; which limit did we hit?: */
3337 if (maxcount - 16 < bytes_left)
3338 /* It was the fault of rd_maxcount: */
3339 nfserr = nfserr_toosmall;
3340 else
3341 /* We ran out of buffer space: */
3342 nfserr = nfserr_resource;
3343 }
3344 if (nfserr)
3345 goto err_no_verf;
3346
3347 if (readdir->cookie_offset) {
3348 wire_offset = cpu_to_be64(offset);
3349 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3350 &wire_offset, 8);
3351 }
3352
3353 p = xdr_reserve_space(xdr, 8);
3354 if (!p) {
3355 WARN_ON_ONCE(1);
3356 goto err_no_verf;
3357 }
3358 *p++ = 0; /* no more entries */
3359 *p++ = htonl(readdir->common.err == nfserr_eof);
3360
3361 return 0;
3362 err_no_verf:
3363 xdr_truncate_encode(xdr, starting_len);
3364 return nfserr;
3365 }
3366
3367 static __be32
3368 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3369 {
3370 struct xdr_stream *xdr = &resp->xdr;
3371 __be32 *p;
3372
3373 if (!nfserr) {
3374 p = xdr_reserve_space(xdr, 20);
3375 if (!p)
3376 return nfserr_resource;
3377 p = encode_cinfo(p, &remove->rm_cinfo);
3378 }
3379 return nfserr;
3380 }
3381
3382 static __be32
3383 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3384 {
3385 struct xdr_stream *xdr = &resp->xdr;
3386 __be32 *p;
3387
3388 if (!nfserr) {
3389 p = xdr_reserve_space(xdr, 40);
3390 if (!p)
3391 return nfserr_resource;
3392 p = encode_cinfo(p, &rename->rn_sinfo);
3393 p = encode_cinfo(p, &rename->rn_tinfo);
3394 }
3395 return nfserr;
3396 }
3397
3398 static __be32
3399 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3400 __be32 nfserr, struct svc_export *exp)
3401 {
3402 u32 i, nflavs, supported;
3403 struct exp_flavor_info *flavs;
3404 struct exp_flavor_info def_flavs[2];
3405 __be32 *p, *flavorsp;
3406 static bool report = true;
3407
3408 if (nfserr)
3409 goto out;
3410 nfserr = nfserr_resource;
3411 if (exp->ex_nflavors) {
3412 flavs = exp->ex_flavors;
3413 nflavs = exp->ex_nflavors;
3414 } else { /* Handling of some defaults in absence of real secinfo: */
3415 flavs = def_flavs;
3416 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3417 nflavs = 2;
3418 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3419 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3420 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3421 nflavs = 1;
3422 flavs[0].pseudoflavor
3423 = svcauth_gss_flavor(exp->ex_client);
3424 } else {
3425 nflavs = 1;
3426 flavs[0].pseudoflavor
3427 = exp->ex_client->flavour->flavour;
3428 }
3429 }
3430
3431 supported = 0;
3432 p = xdr_reserve_space(xdr, 4);
3433 if (!p)
3434 goto out;
3435 flavorsp = p++; /* to be backfilled later */
3436
3437 for (i = 0; i < nflavs; i++) {
3438 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3439 struct rpcsec_gss_info info;
3440
3441 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3442 supported++;
3443 p = xdr_reserve_space(xdr, 4 + 4 +
3444 XDR_LEN(info.oid.len) + 4 + 4);
3445 if (!p)
3446 goto out;
3447 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3448 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3449 *p++ = cpu_to_be32(info.qop);
3450 *p++ = cpu_to_be32(info.service);
3451 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3452 supported++;
3453 p = xdr_reserve_space(xdr, 4);
3454 if (!p)
3455 goto out;
3456 *p++ = cpu_to_be32(pf);
3457 } else {
3458 if (report)
3459 pr_warn("NFS: SECINFO: security flavor %u "
3460 "is not supported\n", pf);
3461 }
3462 }
3463
3464 if (nflavs != supported)
3465 report = false;
3466 *flavorsp = htonl(supported);
3467 nfserr = 0;
3468 out:
3469 if (exp)
3470 exp_put(exp);
3471 return nfserr;
3472 }
3473
3474 static __be32
3475 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3476 struct nfsd4_secinfo *secinfo)
3477 {
3478 struct xdr_stream *xdr = &resp->xdr;
3479
3480 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3481 }
3482
3483 static __be32
3484 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3485 struct nfsd4_secinfo_no_name *secinfo)
3486 {
3487 struct xdr_stream *xdr = &resp->xdr;
3488
3489 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3490 }
3491
3492 /*
3493 * The SETATTR encode routine is special -- it always encodes a bitmap,
3494 * regardless of the error status.
3495 */
3496 static __be32
3497 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3498 {
3499 struct xdr_stream *xdr = &resp->xdr;
3500 __be32 *p;
3501
3502 p = xdr_reserve_space(xdr, 16);
3503 if (!p)
3504 return nfserr_resource;
3505 if (nfserr) {
3506 *p++ = cpu_to_be32(3);
3507 *p++ = cpu_to_be32(0);
3508 *p++ = cpu_to_be32(0);
3509 *p++ = cpu_to_be32(0);
3510 }
3511 else {
3512 *p++ = cpu_to_be32(3);
3513 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3514 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3515 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3516 }
3517 return nfserr;
3518 }
3519
3520 static __be32
3521 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3522 {
3523 struct xdr_stream *xdr = &resp->xdr;
3524 __be32 *p;
3525
3526 if (!nfserr) {
3527 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3528 if (!p)
3529 return nfserr_resource;
3530 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3531 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3532 NFS4_VERIFIER_SIZE);
3533 }
3534 else if (nfserr == nfserr_clid_inuse) {
3535 p = xdr_reserve_space(xdr, 8);
3536 if (!p)
3537 return nfserr_resource;
3538 *p++ = cpu_to_be32(0);
3539 *p++ = cpu_to_be32(0);
3540 }
3541 return nfserr;
3542 }
3543
3544 static __be32
3545 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3546 {
3547 struct xdr_stream *xdr = &resp->xdr;
3548 __be32 *p;
3549
3550 if (!nfserr) {
3551 p = xdr_reserve_space(xdr, 16);
3552 if (!p)
3553 return nfserr_resource;
3554 *p++ = cpu_to_be32(write->wr_bytes_written);
3555 *p++ = cpu_to_be32(write->wr_how_written);
3556 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3557 NFS4_VERIFIER_SIZE);
3558 }
3559 return nfserr;
3560 }
3561
3562 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3563 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3564 1 << (OP_EXCHANGE_ID - 32) |
3565 1 << (OP_CREATE_SESSION - 32) |
3566 1 << (OP_DESTROY_SESSION - 32) |
3567 1 << (OP_DESTROY_CLIENTID - 32)
3568 };
3569
3570 static __be32
3571 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3572 struct nfsd4_exchange_id *exid)
3573 {
3574 struct xdr_stream *xdr = &resp->xdr;
3575 __be32 *p;
3576 char *major_id;
3577 char *server_scope;
3578 int major_id_sz;
3579 int server_scope_sz;
3580 uint64_t minor_id = 0;
3581
3582 if (nfserr)
3583 return nfserr;
3584
3585 major_id = utsname()->nodename;
3586 major_id_sz = strlen(major_id);
3587 server_scope = utsname()->nodename;
3588 server_scope_sz = strlen(server_scope);
3589
3590 p = xdr_reserve_space(xdr,
3591 8 /* eir_clientid */ +
3592 4 /* eir_sequenceid */ +
3593 4 /* eir_flags */ +
3594 4 /* spr_how */);
3595 if (!p)
3596 return nfserr_resource;
3597
3598 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3599 *p++ = cpu_to_be32(exid->seqid);
3600 *p++ = cpu_to_be32(exid->flags);
3601
3602 *p++ = cpu_to_be32(exid->spa_how);
3603
3604 switch (exid->spa_how) {
3605 case SP4_NONE:
3606 break;
3607 case SP4_MACH_CRED:
3608 /* spo_must_enforce, spo_must_allow */
3609 p = xdr_reserve_space(xdr, 16);
3610 if (!p)
3611 return nfserr_resource;
3612
3613 /* spo_must_enforce bitmap: */
3614 *p++ = cpu_to_be32(2);
3615 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3616 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3617 /* empty spo_must_allow bitmap: */
3618 *p++ = cpu_to_be32(0);
3619
3620 break;
3621 default:
3622 WARN_ON_ONCE(1);
3623 }
3624
3625 p = xdr_reserve_space(xdr,
3626 8 /* so_minor_id */ +
3627 4 /* so_major_id.len */ +
3628 (XDR_QUADLEN(major_id_sz) * 4) +
3629 4 /* eir_server_scope.len */ +
3630 (XDR_QUADLEN(server_scope_sz) * 4) +
3631 4 /* eir_server_impl_id.count (0) */);
3632 if (!p)
3633 return nfserr_resource;
3634
3635 /* The server_owner struct */
3636 p = xdr_encode_hyper(p, minor_id); /* Minor id */
3637 /* major id */
3638 p = xdr_encode_opaque(p, major_id, major_id_sz);
3639
3640 /* Server scope */
3641 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3642
3643 /* Implementation id */
3644 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
3645 return 0;
3646 }
3647
3648 static __be32
3649 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3650 struct nfsd4_create_session *sess)
3651 {
3652 struct xdr_stream *xdr = &resp->xdr;
3653 __be32 *p;
3654
3655 if (nfserr)
3656 return nfserr;
3657
3658 p = xdr_reserve_space(xdr, 24);
3659 if (!p)
3660 return nfserr_resource;
3661 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3662 NFS4_MAX_SESSIONID_LEN);
3663 *p++ = cpu_to_be32(sess->seqid);
3664 *p++ = cpu_to_be32(sess->flags);
3665
3666 p = xdr_reserve_space(xdr, 28);
3667 if (!p)
3668 return nfserr_resource;
3669 *p++ = cpu_to_be32(0); /* headerpadsz */
3670 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3671 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3672 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3673 *p++ = cpu_to_be32(sess->fore_channel.maxops);
3674 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3675 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3676
3677 if (sess->fore_channel.nr_rdma_attrs) {
3678 p = xdr_reserve_space(xdr, 4);
3679 if (!p)
3680 return nfserr_resource;
3681 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3682 }
3683
3684 p = xdr_reserve_space(xdr, 28);
3685 if (!p)
3686 return nfserr_resource;
3687 *p++ = cpu_to_be32(0); /* headerpadsz */
3688 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3689 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3690 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3691 *p++ = cpu_to_be32(sess->back_channel.maxops);
3692 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3693 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3694
3695 if (sess->back_channel.nr_rdma_attrs) {
3696 p = xdr_reserve_space(xdr, 4);
3697 if (!p)
3698 return nfserr_resource;
3699 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3700 }
3701 return 0;
3702 }
3703
3704 static __be32
3705 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3706 struct nfsd4_sequence *seq)
3707 {
3708 struct xdr_stream *xdr = &resp->xdr;
3709 __be32 *p;
3710
3711 if (nfserr)
3712 return nfserr;
3713
3714 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3715 if (!p)
3716 return nfserr_resource;
3717 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
3718 NFS4_MAX_SESSIONID_LEN);
3719 *p++ = cpu_to_be32(seq->seqid);
3720 *p++ = cpu_to_be32(seq->slotid);
3721 /* Note slotid's are numbered from zero: */
3722 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
3723 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
3724 *p++ = cpu_to_be32(seq->status_flags);
3725
3726 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3727 return 0;
3728 }
3729
3730 static __be32
3731 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3732 struct nfsd4_test_stateid *test_stateid)
3733 {
3734 struct xdr_stream *xdr = &resp->xdr;
3735 struct nfsd4_test_stateid_id *stateid, *next;
3736 __be32 *p;
3737
3738 if (nfserr)
3739 return nfserr;
3740
3741 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3742 if (!p)
3743 return nfserr_resource;
3744 *p++ = htonl(test_stateid->ts_num_ids);
3745
3746 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3747 *p++ = stateid->ts_id_status;
3748 }
3749
3750 return nfserr;
3751 }
3752
3753 static __be32
3754 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3755 {
3756 return nfserr;
3757 }
3758
3759 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3760
3761 /*
3762 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3763 * since we don't need to filter out obsolete ops as this is
3764 * done in the decoding phase.
3765 */
3766 static nfsd4_enc nfsd4_enc_ops[] = {
3767 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
3768 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
3769 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
3770 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
3771 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
3772 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3773 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
3774 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
3775 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
3776 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
3777 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
3778 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
3779 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
3780 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
3781 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3782 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
3783 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
3784 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
3785 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
3786 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
3787 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
3788 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
3789 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
3790 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
3791 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
3792 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
3793 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
3794 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
3795 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
3796 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
3797 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
3798 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
3799 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
3800 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3801 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3802 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
3803 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
3804
3805 /* NFSv4.1 operations */
3806 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
3807 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3808 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
3809 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
3810 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3811 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
3812 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3813 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
3814 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
3815 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
3816 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
3817 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3818 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3819 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
3820 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
3821 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
3822 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3823 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
3824 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
3825 };
3826
3827 /*
3828 * Calculate whether we still have space to encode repsize bytes.
3829 * There are two considerations:
3830 * - For NFS versions >=4.1, the size of the reply must stay within
3831 * session limits
3832 * - For all NFS versions, we must stay within limited preallocated
3833 * buffer space.
3834 *
3835 * This is called before the operation is processed, so can only provide
3836 * an upper estimate. For some nonidempotent operations (such as
3837 * getattr), it's not necessarily a problem if that estimate is wrong,
3838 * as we can fail it after processing without significant side effects.
3839 */
3840 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
3841 {
3842 struct xdr_buf *buf = &resp->rqstp->rq_res;
3843 struct nfsd4_slot *slot = resp->cstate.slot;
3844
3845 if (buf->len + respsize <= buf->buflen)
3846 return nfs_ok;
3847 if (!nfsd4_has_session(&resp->cstate))
3848 return nfserr_resource;
3849 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
3850 WARN_ON_ONCE(1);
3851 return nfserr_rep_too_big_to_cache;
3852 }
3853 return nfserr_rep_too_big;
3854 }
3855
3856 void
3857 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3858 {
3859 struct xdr_stream *xdr = &resp->xdr;
3860 struct nfs4_stateowner *so = resp->cstate.replay_owner;
3861 struct svc_rqst *rqstp = resp->rqstp;
3862 int post_err_offset;
3863 nfsd4_enc encoder;
3864 __be32 *p;
3865
3866 p = xdr_reserve_space(xdr, 8);
3867 if (!p) {
3868 WARN_ON_ONCE(1);
3869 return;
3870 }
3871 *p++ = cpu_to_be32(op->opnum);
3872 post_err_offset = xdr->buf->len;
3873
3874 if (op->opnum == OP_ILLEGAL)
3875 goto status;
3876 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3877 !nfsd4_enc_ops[op->opnum]);
3878 encoder = nfsd4_enc_ops[op->opnum];
3879 op->status = encoder(resp, op->status, &op->u);
3880 xdr_commit_encode(xdr);
3881
3882 /* nfsd4_check_resp_size guarantees enough room for error status */
3883 if (!op->status) {
3884 int space_needed = 0;
3885 if (!nfsd4_last_compound_op(rqstp))
3886 space_needed = COMPOUND_ERR_SLACK_SPACE;
3887 op->status = nfsd4_check_resp_size(resp, space_needed);
3888 }
3889 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
3890 struct nfsd4_slot *slot = resp->cstate.slot;
3891
3892 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
3893 op->status = nfserr_rep_too_big_to_cache;
3894 else
3895 op->status = nfserr_rep_too_big;
3896 }
3897 if (op->status == nfserr_resource ||
3898 op->status == nfserr_rep_too_big ||
3899 op->status == nfserr_rep_too_big_to_cache) {
3900 /*
3901 * The operation may have already been encoded or
3902 * partially encoded. No op returns anything additional
3903 * in the case of one of these three errors, so we can
3904 * just truncate back to after the status. But it's a
3905 * bug if we had to do this on a non-idempotent op:
3906 */
3907 warn_on_nonidempotent_op(op);
3908 xdr_truncate_encode(xdr, post_err_offset);
3909 }
3910 if (so) {
3911 int len = xdr->buf->len - post_err_offset;
3912
3913 so->so_replay.rp_status = op->status;
3914 so->so_replay.rp_buflen = len;
3915 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
3916 so->so_replay.rp_buf, len);
3917 }
3918 status:
3919 /* Note that op->status is already in network byte order: */
3920 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
3921 }
3922
3923 /*
3924 * Encode the reply stored in the stateowner reply cache
3925 *
3926 * XDR note: do not encode rp->rp_buflen: the buffer contains the
3927 * previously sent already encoded operation.
3928 */
3929 void
3930 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
3931 {
3932 __be32 *p;
3933 struct nfs4_replay *rp = op->replay;
3934
3935 BUG_ON(!rp);
3936
3937 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
3938 if (!p) {
3939 WARN_ON_ONCE(1);
3940 return;
3941 }
3942 *p++ = cpu_to_be32(op->opnum);
3943 *p++ = rp->rp_status; /* already xdr'ed */
3944
3945 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
3946 }
3947
3948 int
3949 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3950 {
3951 return xdr_ressize_check(rqstp, p);
3952 }
3953
3954 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3955 {
3956 struct svc_rqst *rqstp = rq;
3957 struct nfsd4_compoundargs *args = rqstp->rq_argp;
3958
3959 if (args->ops != args->iops) {
3960 kfree(args->ops);
3961 args->ops = args->iops;
3962 }
3963 kfree(args->tmpp);
3964 args->tmpp = NULL;
3965 while (args->to_free) {
3966 struct svcxdr_tmpbuf *tb = args->to_free;
3967 args->to_free = tb->next;
3968 kfree(tb);
3969 }
3970 return 1;
3971 }
3972
3973 int
3974 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3975 {
3976 if (rqstp->rq_arg.head[0].iov_len % 4) {
3977 /* client is nuts */
3978 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
3979 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
3980 return 0;
3981 }
3982 args->p = p;
3983 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3984 args->pagelist = rqstp->rq_arg.pages;
3985 args->pagelen = rqstp->rq_arg.page_len;
3986 args->tmpp = NULL;
3987 args->to_free = NULL;
3988 args->ops = args->iops;
3989 args->rqstp = rqstp;
3990
3991 return !nfsd4_decode_compound(args);
3992 }
3993
3994 int
3995 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3996 {
3997 /*
3998 * All that remains is to write the tag and operation count...
3999 */
4000 struct xdr_buf *buf = resp->xdr.buf;
4001
4002 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4003 buf->tail[0].iov_len);
4004
4005 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4006
4007 p = resp->tagp;
4008 *p++ = htonl(resp->taglen);
4009 memcpy(p, resp->tag, resp->taglen);
4010 p += XDR_QUADLEN(resp->taglen);
4011 *p++ = htonl(resp->opcnt);
4012
4013 nfsd4_sequence_done(resp);
4014 return 1;
4015 }
4016
4017 /*
4018 * Local variables:
4019 * c-basic-offset: 8
4020 * End:
4021 */
Linux with added FPC-III support