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