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Merge remote-tracking branches 'regulator/topic/rc5t619' and 'regulator/topic/stm32...
[mirror_ubuntu-eoan-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 + XDR_QUADLEN(argp->pagelen);
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 next_decode_page(argp);
1283 }
1284 argp->p += XDR_QUADLEN(len);
1285
1286 DECODE_TAIL;
1287 }
1288
1289 static __be32
1290 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1291 {
1292 DECODE_HEAD;
1293
1294 if (argp->minorversion >= 1)
1295 return nfserr_notsupp;
1296
1297 READ_BUF(12);
1298 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1299 rlockowner->rl_owner.len = be32_to_cpup(p++);
1300 READ_BUF(rlockowner->rl_owner.len);
1301 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1302
1303 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1304 return nfserr_inval;
1305 DECODE_TAIL;
1306 }
1307
1308 static __be32
1309 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1310 struct nfsd4_exchange_id *exid)
1311 {
1312 int dummy, tmp;
1313 DECODE_HEAD;
1314
1315 READ_BUF(NFS4_VERIFIER_SIZE);
1316 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1317
1318 status = nfsd4_decode_opaque(argp, &exid->clname);
1319 if (status)
1320 return nfserr_bad_xdr;
1321
1322 READ_BUF(4);
1323 exid->flags = be32_to_cpup(p++);
1324
1325 /* Ignore state_protect4_a */
1326 READ_BUF(4);
1327 exid->spa_how = be32_to_cpup(p++);
1328 switch (exid->spa_how) {
1329 case SP4_NONE:
1330 break;
1331 case SP4_MACH_CRED:
1332 /* spo_must_enforce */
1333 status = nfsd4_decode_bitmap(argp,
1334 exid->spo_must_enforce);
1335 if (status)
1336 goto out;
1337 /* spo_must_allow */
1338 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1339 if (status)
1340 goto out;
1341 break;
1342 case SP4_SSV:
1343 /* ssp_ops */
1344 READ_BUF(4);
1345 dummy = be32_to_cpup(p++);
1346 READ_BUF(dummy * 4);
1347 p += dummy;
1348
1349 READ_BUF(4);
1350 dummy = be32_to_cpup(p++);
1351 READ_BUF(dummy * 4);
1352 p += dummy;
1353
1354 /* ssp_hash_algs<> */
1355 READ_BUF(4);
1356 tmp = be32_to_cpup(p++);
1357 while (tmp--) {
1358 READ_BUF(4);
1359 dummy = be32_to_cpup(p++);
1360 READ_BUF(dummy);
1361 p += XDR_QUADLEN(dummy);
1362 }
1363
1364 /* ssp_encr_algs<> */
1365 READ_BUF(4);
1366 tmp = be32_to_cpup(p++);
1367 while (tmp--) {
1368 READ_BUF(4);
1369 dummy = be32_to_cpup(p++);
1370 READ_BUF(dummy);
1371 p += XDR_QUADLEN(dummy);
1372 }
1373
1374 /* ssp_window and ssp_num_gss_handles */
1375 READ_BUF(8);
1376 dummy = be32_to_cpup(p++);
1377 dummy = be32_to_cpup(p++);
1378 break;
1379 default:
1380 goto xdr_error;
1381 }
1382
1383 /* Ignore Implementation ID */
1384 READ_BUF(4); /* nfs_impl_id4 array length */
1385 dummy = be32_to_cpup(p++);
1386
1387 if (dummy > 1)
1388 goto xdr_error;
1389
1390 if (dummy == 1) {
1391 /* nii_domain */
1392 READ_BUF(4);
1393 dummy = be32_to_cpup(p++);
1394 READ_BUF(dummy);
1395 p += XDR_QUADLEN(dummy);
1396
1397 /* nii_name */
1398 READ_BUF(4);
1399 dummy = be32_to_cpup(p++);
1400 READ_BUF(dummy);
1401 p += XDR_QUADLEN(dummy);
1402
1403 /* nii_date */
1404 READ_BUF(12);
1405 p += 3;
1406 }
1407 DECODE_TAIL;
1408 }
1409
1410 static __be32
1411 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1412 struct nfsd4_create_session *sess)
1413 {
1414 DECODE_HEAD;
1415 u32 dummy;
1416
1417 READ_BUF(16);
1418 COPYMEM(&sess->clientid, 8);
1419 sess->seqid = be32_to_cpup(p++);
1420 sess->flags = be32_to_cpup(p++);
1421
1422 /* Fore channel attrs */
1423 READ_BUF(28);
1424 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1425 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1426 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1427 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1428 sess->fore_channel.maxops = be32_to_cpup(p++);
1429 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1430 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1431 if (sess->fore_channel.nr_rdma_attrs == 1) {
1432 READ_BUF(4);
1433 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1434 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1435 dprintk("Too many fore channel attr bitmaps!\n");
1436 goto xdr_error;
1437 }
1438
1439 /* Back channel attrs */
1440 READ_BUF(28);
1441 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1442 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1443 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1444 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1445 sess->back_channel.maxops = be32_to_cpup(p++);
1446 sess->back_channel.maxreqs = be32_to_cpup(p++);
1447 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1448 if (sess->back_channel.nr_rdma_attrs == 1) {
1449 READ_BUF(4);
1450 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1451 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1452 dprintk("Too many back channel attr bitmaps!\n");
1453 goto xdr_error;
1454 }
1455
1456 READ_BUF(4);
1457 sess->callback_prog = be32_to_cpup(p++);
1458 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1459 DECODE_TAIL;
1460 }
1461
1462 static __be32
1463 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1464 struct nfsd4_destroy_session *destroy_session)
1465 {
1466 DECODE_HEAD;
1467 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1468 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1469
1470 DECODE_TAIL;
1471 }
1472
1473 static __be32
1474 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1475 struct nfsd4_free_stateid *free_stateid)
1476 {
1477 DECODE_HEAD;
1478
1479 READ_BUF(sizeof(stateid_t));
1480 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1481 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1482
1483 DECODE_TAIL;
1484 }
1485
1486 static __be32
1487 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1488 struct nfsd4_sequence *seq)
1489 {
1490 DECODE_HEAD;
1491
1492 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1493 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1494 seq->seqid = be32_to_cpup(p++);
1495 seq->slotid = be32_to_cpup(p++);
1496 seq->maxslots = be32_to_cpup(p++);
1497 seq->cachethis = be32_to_cpup(p++);
1498
1499 DECODE_TAIL;
1500 }
1501
1502 static __be32
1503 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1504 {
1505 int i;
1506 __be32 *p, status;
1507 struct nfsd4_test_stateid_id *stateid;
1508
1509 READ_BUF(4);
1510 test_stateid->ts_num_ids = ntohl(*p++);
1511
1512 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1513
1514 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1515 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1516 if (!stateid) {
1517 status = nfserrno(-ENOMEM);
1518 goto out;
1519 }
1520
1521 INIT_LIST_HEAD(&stateid->ts_id_list);
1522 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1523
1524 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1525 if (status)
1526 goto out;
1527 }
1528
1529 status = 0;
1530 out:
1531 return status;
1532 xdr_error:
1533 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1534 status = nfserr_bad_xdr;
1535 goto out;
1536 }
1537
1538 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1539 {
1540 DECODE_HEAD;
1541
1542 READ_BUF(8);
1543 COPYMEM(&dc->clientid, 8);
1544
1545 DECODE_TAIL;
1546 }
1547
1548 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1549 {
1550 DECODE_HEAD;
1551
1552 READ_BUF(4);
1553 rc->rca_one_fs = be32_to_cpup(p++);
1554
1555 DECODE_TAIL;
1556 }
1557
1558 #ifdef CONFIG_NFSD_PNFS
1559 static __be32
1560 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1561 struct nfsd4_getdeviceinfo *gdev)
1562 {
1563 DECODE_HEAD;
1564 u32 num, i;
1565
1566 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1567 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1568 gdev->gd_layout_type = be32_to_cpup(p++);
1569 gdev->gd_maxcount = be32_to_cpup(p++);
1570 num = be32_to_cpup(p++);
1571 if (num) {
1572 READ_BUF(4 * num);
1573 gdev->gd_notify_types = be32_to_cpup(p++);
1574 for (i = 1; i < num; i++) {
1575 if (be32_to_cpup(p++)) {
1576 status = nfserr_inval;
1577 goto out;
1578 }
1579 }
1580 }
1581 DECODE_TAIL;
1582 }
1583
1584 static __be32
1585 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1586 struct nfsd4_layoutget *lgp)
1587 {
1588 DECODE_HEAD;
1589
1590 READ_BUF(36);
1591 lgp->lg_signal = be32_to_cpup(p++);
1592 lgp->lg_layout_type = be32_to_cpup(p++);
1593 lgp->lg_seg.iomode = be32_to_cpup(p++);
1594 p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1595 p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1596 p = xdr_decode_hyper(p, &lgp->lg_minlength);
1597
1598 status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1599 if (status)
1600 return status;
1601
1602 READ_BUF(4);
1603 lgp->lg_maxcount = be32_to_cpup(p++);
1604
1605 DECODE_TAIL;
1606 }
1607
1608 static __be32
1609 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1610 struct nfsd4_layoutcommit *lcp)
1611 {
1612 DECODE_HEAD;
1613 u32 timechange;
1614
1615 READ_BUF(20);
1616 p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1617 p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1618 lcp->lc_reclaim = be32_to_cpup(p++);
1619
1620 status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1621 if (status)
1622 return status;
1623
1624 READ_BUF(4);
1625 lcp->lc_newoffset = be32_to_cpup(p++);
1626 if (lcp->lc_newoffset) {
1627 READ_BUF(8);
1628 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1629 } else
1630 lcp->lc_last_wr = 0;
1631 READ_BUF(4);
1632 timechange = be32_to_cpup(p++);
1633 if (timechange) {
1634 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1635 if (status)
1636 return status;
1637 } else {
1638 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1639 }
1640 READ_BUF(8);
1641 lcp->lc_layout_type = be32_to_cpup(p++);
1642
1643 /*
1644 * Save the layout update in XDR format and let the layout driver deal
1645 * with it later.
1646 */
1647 lcp->lc_up_len = be32_to_cpup(p++);
1648 if (lcp->lc_up_len > 0) {
1649 READ_BUF(lcp->lc_up_len);
1650 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1651 }
1652
1653 DECODE_TAIL;
1654 }
1655
1656 static __be32
1657 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1658 struct nfsd4_layoutreturn *lrp)
1659 {
1660 DECODE_HEAD;
1661
1662 READ_BUF(16);
1663 lrp->lr_reclaim = be32_to_cpup(p++);
1664 lrp->lr_layout_type = be32_to_cpup(p++);
1665 lrp->lr_seg.iomode = be32_to_cpup(p++);
1666 lrp->lr_return_type = be32_to_cpup(p++);
1667 if (lrp->lr_return_type == RETURN_FILE) {
1668 READ_BUF(16);
1669 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1670 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1671
1672 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1673 if (status)
1674 return status;
1675
1676 READ_BUF(4);
1677 lrp->lrf_body_len = be32_to_cpup(p++);
1678 if (lrp->lrf_body_len > 0) {
1679 READ_BUF(lrp->lrf_body_len);
1680 READMEM(lrp->lrf_body, lrp->lrf_body_len);
1681 }
1682 } else {
1683 lrp->lr_seg.offset = 0;
1684 lrp->lr_seg.length = NFS4_MAX_UINT64;
1685 }
1686
1687 DECODE_TAIL;
1688 }
1689 #endif /* CONFIG_NFSD_PNFS */
1690
1691 static __be32
1692 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1693 struct nfsd4_fallocate *fallocate)
1694 {
1695 DECODE_HEAD;
1696
1697 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1698 if (status)
1699 return status;
1700
1701 READ_BUF(16);
1702 p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1703 xdr_decode_hyper(p, &fallocate->falloc_length);
1704
1705 DECODE_TAIL;
1706 }
1707
1708 static __be32
1709 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1710 {
1711 DECODE_HEAD;
1712
1713 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1714 if (status)
1715 return status;
1716 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1717 if (status)
1718 return status;
1719
1720 READ_BUF(8 + 8 + 8);
1721 p = xdr_decode_hyper(p, &clone->cl_src_pos);
1722 p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1723 p = xdr_decode_hyper(p, &clone->cl_count);
1724 DECODE_TAIL;
1725 }
1726
1727 static __be32
1728 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1729 {
1730 DECODE_HEAD;
1731 unsigned int tmp;
1732
1733 status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1734 if (status)
1735 return status;
1736 status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1737 if (status)
1738 return status;
1739
1740 READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1741 p = xdr_decode_hyper(p, &copy->cp_src_pos);
1742 p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1743 p = xdr_decode_hyper(p, &copy->cp_count);
1744 copy->cp_consecutive = be32_to_cpup(p++);
1745 copy->cp_synchronous = be32_to_cpup(p++);
1746 tmp = be32_to_cpup(p); /* Source server list not supported */
1747
1748 DECODE_TAIL;
1749 }
1750
1751 static __be32
1752 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1753 {
1754 DECODE_HEAD;
1755
1756 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1757 if (status)
1758 return status;
1759
1760 READ_BUF(8 + 4);
1761 p = xdr_decode_hyper(p, &seek->seek_offset);
1762 seek->seek_whence = be32_to_cpup(p);
1763
1764 DECODE_TAIL;
1765 }
1766
1767 static __be32
1768 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1769 {
1770 return nfs_ok;
1771 }
1772
1773 static __be32
1774 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1775 {
1776 return nfserr_notsupp;
1777 }
1778
1779 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1780
1781 static nfsd4_dec nfsd4_dec_ops[] = {
1782 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1783 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1784 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1785 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1786 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1787 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1788 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1789 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1790 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1791 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1792 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1793 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1794 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1795 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1796 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1797 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1798 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1799 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1800 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1801 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1802 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1803 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1804 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1805 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1806 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1807 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1808 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1809 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1810 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1811 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1812 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1813 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1814 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1815 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1816 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1817 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1818 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1819
1820 /* new operations for NFSv4.1 */
1821 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1822 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1823 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1824 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1825 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1826 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1827 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1828 #ifdef CONFIG_NFSD_PNFS
1829 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1830 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1831 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit,
1832 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget,
1833 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn,
1834 #else
1835 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1836 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1837 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1838 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1839 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1840 #endif
1841 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1842 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1843 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1844 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1845 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1846 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1847 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1848
1849 /* new operations for NFSv4.2 */
1850 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1851 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy,
1852 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
1853 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1854 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
1855 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
1856 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
1857 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp,
1858 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1859 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1860 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
1861 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
1862 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone,
1863 };
1864
1865 static inline bool
1866 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1867 {
1868 if (op->opnum < FIRST_NFS4_OP)
1869 return false;
1870 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1871 return false;
1872 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1873 return false;
1874 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1875 return false;
1876 return true;
1877 }
1878
1879 static __be32
1880 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1881 {
1882 DECODE_HEAD;
1883 struct nfsd4_op *op;
1884 bool cachethis = false;
1885 int auth_slack= argp->rqstp->rq_auth_slack;
1886 int max_reply = auth_slack + 8; /* opcnt, status */
1887 int readcount = 0;
1888 int readbytes = 0;
1889 int i;
1890
1891 READ_BUF(4);
1892 argp->taglen = be32_to_cpup(p++);
1893 READ_BUF(argp->taglen);
1894 SAVEMEM(argp->tag, argp->taglen);
1895 READ_BUF(8);
1896 argp->minorversion = be32_to_cpup(p++);
1897 argp->opcnt = be32_to_cpup(p++);
1898 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1899
1900 if (argp->taglen > NFSD4_MAX_TAGLEN)
1901 goto xdr_error;
1902 if (argp->opcnt > 100)
1903 goto xdr_error;
1904
1905 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1906 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1907 if (!argp->ops) {
1908 argp->ops = argp->iops;
1909 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1910 goto xdr_error;
1911 }
1912 }
1913
1914 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1915 argp->opcnt = 0;
1916
1917 for (i = 0; i < argp->opcnt; i++) {
1918 op = &argp->ops[i];
1919 op->replay = NULL;
1920
1921 READ_BUF(4);
1922 op->opnum = be32_to_cpup(p++);
1923
1924 if (nfsd4_opnum_in_range(argp, op))
1925 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1926 else {
1927 op->opnum = OP_ILLEGAL;
1928 op->status = nfserr_op_illegal;
1929 }
1930 /*
1931 * We'll try to cache the result in the DRC if any one
1932 * op in the compound wants to be cached:
1933 */
1934 cachethis |= nfsd4_cache_this_op(op);
1935
1936 if (op->opnum == OP_READ) {
1937 readcount++;
1938 readbytes += nfsd4_max_reply(argp->rqstp, op);
1939 } else
1940 max_reply += nfsd4_max_reply(argp->rqstp, op);
1941 /*
1942 * OP_LOCK and OP_LOCKT may return a conflicting lock.
1943 * (Special case because it will just skip encoding this
1944 * if it runs out of xdr buffer space, and it is the only
1945 * operation that behaves this way.)
1946 */
1947 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1948 max_reply += NFS4_OPAQUE_LIMIT;
1949
1950 if (op->status) {
1951 argp->opcnt = i+1;
1952 break;
1953 }
1954 }
1955 /* Sessions make the DRC unnecessary: */
1956 if (argp->minorversion)
1957 cachethis = false;
1958 svc_reserve(argp->rqstp, max_reply + readbytes);
1959 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1960
1961 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1962 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1963
1964 DECODE_TAIL;
1965 }
1966
1967 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
1968 struct svc_export *exp)
1969 {
1970 if (exp->ex_flags & NFSEXP_V4ROOT) {
1971 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
1972 *p++ = 0;
1973 } else if (IS_I_VERSION(inode)) {
1974 p = xdr_encode_hyper(p, nfsd4_change_attribute(inode));
1975 } else {
1976 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1977 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1978 }
1979 return p;
1980 }
1981
1982 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1983 {
1984 *p++ = cpu_to_be32(c->atomic);
1985 if (c->change_supported) {
1986 p = xdr_encode_hyper(p, c->before_change);
1987 p = xdr_encode_hyper(p, c->after_change);
1988 } else {
1989 *p++ = cpu_to_be32(c->before_ctime_sec);
1990 *p++ = cpu_to_be32(c->before_ctime_nsec);
1991 *p++ = cpu_to_be32(c->after_ctime_sec);
1992 *p++ = cpu_to_be32(c->after_ctime_nsec);
1993 }
1994 return p;
1995 }
1996
1997 /* Encode as an array of strings the string given with components
1998 * separated @sep, escaped with esc_enter and esc_exit.
1999 */
2000 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2001 char *components, char esc_enter,
2002 char esc_exit)
2003 {
2004 __be32 *p;
2005 __be32 pathlen;
2006 int pathlen_offset;
2007 int strlen, count=0;
2008 char *str, *end, *next;
2009
2010 dprintk("nfsd4_encode_components(%s)\n", components);
2011
2012 pathlen_offset = xdr->buf->len;
2013 p = xdr_reserve_space(xdr, 4);
2014 if (!p)
2015 return nfserr_resource;
2016 p++; /* We will fill this in with @count later */
2017
2018 end = str = components;
2019 while (*end) {
2020 bool found_esc = false;
2021
2022 /* try to parse as esc_start, ..., esc_end, sep */
2023 if (*str == esc_enter) {
2024 for (; *end && (*end != esc_exit); end++)
2025 /* find esc_exit or end of string */;
2026 next = end + 1;
2027 if (*end && (!*next || *next == sep)) {
2028 str++;
2029 found_esc = true;
2030 }
2031 }
2032
2033 if (!found_esc)
2034 for (; *end && (*end != sep); end++)
2035 /* find sep or end of string */;
2036
2037 strlen = end - str;
2038 if (strlen) {
2039 p = xdr_reserve_space(xdr, strlen + 4);
2040 if (!p)
2041 return nfserr_resource;
2042 p = xdr_encode_opaque(p, str, strlen);
2043 count++;
2044 }
2045 else
2046 end++;
2047 if (found_esc)
2048 end = next;
2049
2050 str = end;
2051 }
2052 pathlen = htonl(count);
2053 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2054 return 0;
2055 }
2056
2057 /* Encode as an array of strings the string given with components
2058 * separated @sep.
2059 */
2060 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2061 char *components)
2062 {
2063 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2064 }
2065
2066 /*
2067 * encode a location element of a fs_locations structure
2068 */
2069 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2070 struct nfsd4_fs_location *location)
2071 {
2072 __be32 status;
2073
2074 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2075 '[', ']');
2076 if (status)
2077 return status;
2078 status = nfsd4_encode_components(xdr, '/', location->path);
2079 if (status)
2080 return status;
2081 return 0;
2082 }
2083
2084 /*
2085 * Encode a path in RFC3530 'pathname4' format
2086 */
2087 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2088 const struct path *root,
2089 const struct path *path)
2090 {
2091 struct path cur = *path;
2092 __be32 *p;
2093 struct dentry **components = NULL;
2094 unsigned int ncomponents = 0;
2095 __be32 err = nfserr_jukebox;
2096
2097 dprintk("nfsd4_encode_components(");
2098
2099 path_get(&cur);
2100 /* First walk the path up to the nfsd root, and store the
2101 * dentries/path components in an array.
2102 */
2103 for (;;) {
2104 if (path_equal(&cur, root))
2105 break;
2106 if (cur.dentry == cur.mnt->mnt_root) {
2107 if (follow_up(&cur))
2108 continue;
2109 goto out_free;
2110 }
2111 if ((ncomponents & 15) == 0) {
2112 struct dentry **new;
2113 new = krealloc(components,
2114 sizeof(*new) * (ncomponents + 16),
2115 GFP_KERNEL);
2116 if (!new)
2117 goto out_free;
2118 components = new;
2119 }
2120 components[ncomponents++] = cur.dentry;
2121 cur.dentry = dget_parent(cur.dentry);
2122 }
2123 err = nfserr_resource;
2124 p = xdr_reserve_space(xdr, 4);
2125 if (!p)
2126 goto out_free;
2127 *p++ = cpu_to_be32(ncomponents);
2128
2129 while (ncomponents) {
2130 struct dentry *dentry = components[ncomponents - 1];
2131 unsigned int len;
2132
2133 spin_lock(&dentry->d_lock);
2134 len = dentry->d_name.len;
2135 p = xdr_reserve_space(xdr, len + 4);
2136 if (!p) {
2137 spin_unlock(&dentry->d_lock);
2138 goto out_free;
2139 }
2140 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2141 dprintk("/%pd", dentry);
2142 spin_unlock(&dentry->d_lock);
2143 dput(dentry);
2144 ncomponents--;
2145 }
2146
2147 err = 0;
2148 out_free:
2149 dprintk(")\n");
2150 while (ncomponents)
2151 dput(components[--ncomponents]);
2152 kfree(components);
2153 path_put(&cur);
2154 return err;
2155 }
2156
2157 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2158 struct svc_rqst *rqstp, const struct path *path)
2159 {
2160 struct svc_export *exp_ps;
2161 __be32 res;
2162
2163 exp_ps = rqst_find_fsidzero_export(rqstp);
2164 if (IS_ERR(exp_ps))
2165 return nfserrno(PTR_ERR(exp_ps));
2166 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2167 exp_put(exp_ps);
2168 return res;
2169 }
2170
2171 /*
2172 * encode a fs_locations structure
2173 */
2174 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2175 struct svc_rqst *rqstp, struct svc_export *exp)
2176 {
2177 __be32 status;
2178 int i;
2179 __be32 *p;
2180 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2181
2182 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2183 if (status)
2184 return status;
2185 p = xdr_reserve_space(xdr, 4);
2186 if (!p)
2187 return nfserr_resource;
2188 *p++ = cpu_to_be32(fslocs->locations_count);
2189 for (i=0; i<fslocs->locations_count; i++) {
2190 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2191 if (status)
2192 return status;
2193 }
2194 return 0;
2195 }
2196
2197 static u32 nfs4_file_type(umode_t mode)
2198 {
2199 switch (mode & S_IFMT) {
2200 case S_IFIFO: return NF4FIFO;
2201 case S_IFCHR: return NF4CHR;
2202 case S_IFDIR: return NF4DIR;
2203 case S_IFBLK: return NF4BLK;
2204 case S_IFLNK: return NF4LNK;
2205 case S_IFREG: return NF4REG;
2206 case S_IFSOCK: return NF4SOCK;
2207 default: return NF4BAD;
2208 };
2209 }
2210
2211 static inline __be32
2212 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2213 struct nfs4_ace *ace)
2214 {
2215 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2216 return nfs4_acl_write_who(xdr, ace->whotype);
2217 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2218 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2219 else
2220 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2221 }
2222
2223 static inline __be32
2224 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2225 {
2226 __be32 *p;
2227 unsigned long i = hweight_long(layout_types);
2228
2229 p = xdr_reserve_space(xdr, 4 + 4 * i);
2230 if (!p)
2231 return nfserr_resource;
2232
2233 *p++ = cpu_to_be32(i);
2234
2235 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2236 if (layout_types & (1 << i))
2237 *p++ = cpu_to_be32(i);
2238
2239 return 0;
2240 }
2241
2242 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2243 FATTR4_WORD0_RDATTR_ERROR)
2244 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2245 #define WORD2_ABSENT_FS_ATTRS 0
2246
2247 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2248 static inline __be32
2249 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2250 void *context, int len)
2251 {
2252 __be32 *p;
2253
2254 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2255 if (!p)
2256 return nfserr_resource;
2257
2258 /*
2259 * For now we use a 0 here to indicate the null translation; in
2260 * the future we may place a call to translation code here.
2261 */
2262 *p++ = cpu_to_be32(0); /* lfs */
2263 *p++ = cpu_to_be32(0); /* pi */
2264 p = xdr_encode_opaque(p, context, len);
2265 return 0;
2266 }
2267 #else
2268 static inline __be32
2269 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2270 void *context, int len)
2271 { return 0; }
2272 #endif
2273
2274 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2275 {
2276 /* As per referral draft: */
2277 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2278 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2279 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2280 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2281 *rdattr_err = NFSERR_MOVED;
2282 else
2283 return nfserr_moved;
2284 }
2285 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2286 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2287 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2288 return 0;
2289 }
2290
2291
2292 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2293 {
2294 struct path path = exp->ex_path;
2295 int err;
2296
2297 path_get(&path);
2298 while (follow_up(&path)) {
2299 if (path.dentry != path.mnt->mnt_root)
2300 break;
2301 }
2302 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2303 path_put(&path);
2304 return err;
2305 }
2306
2307 static __be32
2308 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2309 {
2310 __be32 *p;
2311
2312 if (bmval2) {
2313 p = xdr_reserve_space(xdr, 16);
2314 if (!p)
2315 goto out_resource;
2316 *p++ = cpu_to_be32(3);
2317 *p++ = cpu_to_be32(bmval0);
2318 *p++ = cpu_to_be32(bmval1);
2319 *p++ = cpu_to_be32(bmval2);
2320 } else if (bmval1) {
2321 p = xdr_reserve_space(xdr, 12);
2322 if (!p)
2323 goto out_resource;
2324 *p++ = cpu_to_be32(2);
2325 *p++ = cpu_to_be32(bmval0);
2326 *p++ = cpu_to_be32(bmval1);
2327 } else {
2328 p = xdr_reserve_space(xdr, 8);
2329 if (!p)
2330 goto out_resource;
2331 *p++ = cpu_to_be32(1);
2332 *p++ = cpu_to_be32(bmval0);
2333 }
2334
2335 return 0;
2336 out_resource:
2337 return nfserr_resource;
2338 }
2339
2340 /*
2341 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2342 * ourselves.
2343 */
2344 static __be32
2345 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2346 struct svc_export *exp,
2347 struct dentry *dentry, u32 *bmval,
2348 struct svc_rqst *rqstp, int ignore_crossmnt)
2349 {
2350 u32 bmval0 = bmval[0];
2351 u32 bmval1 = bmval[1];
2352 u32 bmval2 = bmval[2];
2353 struct kstat stat;
2354 struct svc_fh *tempfh = NULL;
2355 struct kstatfs statfs;
2356 __be32 *p;
2357 int starting_len = xdr->buf->len;
2358 int attrlen_offset;
2359 __be32 attrlen;
2360 u32 dummy;
2361 u64 dummy64;
2362 u32 rdattr_err = 0;
2363 __be32 status;
2364 int err;
2365 struct nfs4_acl *acl = NULL;
2366 void *context = NULL;
2367 int contextlen;
2368 bool contextsupport = false;
2369 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2370 u32 minorversion = resp->cstate.minorversion;
2371 struct path path = {
2372 .mnt = exp->ex_path.mnt,
2373 .dentry = dentry,
2374 };
2375 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2376
2377 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2378 BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2379
2380 if (exp->ex_fslocs.migrated) {
2381 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2382 if (status)
2383 goto out;
2384 }
2385
2386 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2387 if (err)
2388 goto out_nfserr;
2389 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2390 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2391 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2392 FATTR4_WORD1_SPACE_TOTAL))) {
2393 err = vfs_statfs(&path, &statfs);
2394 if (err)
2395 goto out_nfserr;
2396 }
2397 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2398 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2399 status = nfserr_jukebox;
2400 if (!tempfh)
2401 goto out;
2402 fh_init(tempfh, NFS4_FHSIZE);
2403 status = fh_compose(tempfh, exp, dentry, NULL);
2404 if (status)
2405 goto out;
2406 fhp = tempfh;
2407 }
2408 if (bmval0 & FATTR4_WORD0_ACL) {
2409 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2410 if (err == -EOPNOTSUPP)
2411 bmval0 &= ~FATTR4_WORD0_ACL;
2412 else if (err == -EINVAL) {
2413 status = nfserr_attrnotsupp;
2414 goto out;
2415 } else if (err != 0)
2416 goto out_nfserr;
2417 }
2418
2419 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2420 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2421 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2422 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2423 err = security_inode_getsecctx(d_inode(dentry),
2424 &context, &contextlen);
2425 else
2426 err = -EOPNOTSUPP;
2427 contextsupport = (err == 0);
2428 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2429 if (err == -EOPNOTSUPP)
2430 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2431 else if (err)
2432 goto out_nfserr;
2433 }
2434 }
2435 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2436
2437 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2438 if (status)
2439 goto out;
2440
2441 attrlen_offset = xdr->buf->len;
2442 p = xdr_reserve_space(xdr, 4);
2443 if (!p)
2444 goto out_resource;
2445 p++; /* to be backfilled later */
2446
2447 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2448 u32 supp[3];
2449
2450 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2451
2452 if (!IS_POSIXACL(dentry->d_inode))
2453 supp[0] &= ~FATTR4_WORD0_ACL;
2454 if (!contextsupport)
2455 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2456 if (!supp[2]) {
2457 p = xdr_reserve_space(xdr, 12);
2458 if (!p)
2459 goto out_resource;
2460 *p++ = cpu_to_be32(2);
2461 *p++ = cpu_to_be32(supp[0]);
2462 *p++ = cpu_to_be32(supp[1]);
2463 } else {
2464 p = xdr_reserve_space(xdr, 16);
2465 if (!p)
2466 goto out_resource;
2467 *p++ = cpu_to_be32(3);
2468 *p++ = cpu_to_be32(supp[0]);
2469 *p++ = cpu_to_be32(supp[1]);
2470 *p++ = cpu_to_be32(supp[2]);
2471 }
2472 }
2473 if (bmval0 & FATTR4_WORD0_TYPE) {
2474 p = xdr_reserve_space(xdr, 4);
2475 if (!p)
2476 goto out_resource;
2477 dummy = nfs4_file_type(stat.mode);
2478 if (dummy == NF4BAD) {
2479 status = nfserr_serverfault;
2480 goto out;
2481 }
2482 *p++ = cpu_to_be32(dummy);
2483 }
2484 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2485 p = xdr_reserve_space(xdr, 4);
2486 if (!p)
2487 goto out_resource;
2488 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2489 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2490 else
2491 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2492 NFS4_FH_VOL_RENAME);
2493 }
2494 if (bmval0 & FATTR4_WORD0_CHANGE) {
2495 p = xdr_reserve_space(xdr, 8);
2496 if (!p)
2497 goto out_resource;
2498 p = encode_change(p, &stat, d_inode(dentry), exp);
2499 }
2500 if (bmval0 & FATTR4_WORD0_SIZE) {
2501 p = xdr_reserve_space(xdr, 8);
2502 if (!p)
2503 goto out_resource;
2504 p = xdr_encode_hyper(p, stat.size);
2505 }
2506 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2507 p = xdr_reserve_space(xdr, 4);
2508 if (!p)
2509 goto out_resource;
2510 *p++ = cpu_to_be32(1);
2511 }
2512 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2513 p = xdr_reserve_space(xdr, 4);
2514 if (!p)
2515 goto out_resource;
2516 *p++ = cpu_to_be32(1);
2517 }
2518 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2519 p = xdr_reserve_space(xdr, 4);
2520 if (!p)
2521 goto out_resource;
2522 *p++ = cpu_to_be32(0);
2523 }
2524 if (bmval0 & FATTR4_WORD0_FSID) {
2525 p = xdr_reserve_space(xdr, 16);
2526 if (!p)
2527 goto out_resource;
2528 if (exp->ex_fslocs.migrated) {
2529 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2530 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2531 } else switch(fsid_source(fhp)) {
2532 case FSIDSOURCE_FSID:
2533 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2534 p = xdr_encode_hyper(p, (u64)0);
2535 break;
2536 case FSIDSOURCE_DEV:
2537 *p++ = cpu_to_be32(0);
2538 *p++ = cpu_to_be32(MAJOR(stat.dev));
2539 *p++ = cpu_to_be32(0);
2540 *p++ = cpu_to_be32(MINOR(stat.dev));
2541 break;
2542 case FSIDSOURCE_UUID:
2543 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2544 EX_UUID_LEN);
2545 break;
2546 }
2547 }
2548 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2549 p = xdr_reserve_space(xdr, 4);
2550 if (!p)
2551 goto out_resource;
2552 *p++ = cpu_to_be32(0);
2553 }
2554 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2555 p = xdr_reserve_space(xdr, 4);
2556 if (!p)
2557 goto out_resource;
2558 *p++ = cpu_to_be32(nn->nfsd4_lease);
2559 }
2560 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2561 p = xdr_reserve_space(xdr, 4);
2562 if (!p)
2563 goto out_resource;
2564 *p++ = cpu_to_be32(rdattr_err);
2565 }
2566 if (bmval0 & FATTR4_WORD0_ACL) {
2567 struct nfs4_ace *ace;
2568
2569 if (acl == NULL) {
2570 p = xdr_reserve_space(xdr, 4);
2571 if (!p)
2572 goto out_resource;
2573
2574 *p++ = cpu_to_be32(0);
2575 goto out_acl;
2576 }
2577 p = xdr_reserve_space(xdr, 4);
2578 if (!p)
2579 goto out_resource;
2580 *p++ = cpu_to_be32(acl->naces);
2581
2582 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2583 p = xdr_reserve_space(xdr, 4*3);
2584 if (!p)
2585 goto out_resource;
2586 *p++ = cpu_to_be32(ace->type);
2587 *p++ = cpu_to_be32(ace->flag);
2588 *p++ = cpu_to_be32(ace->access_mask &
2589 NFS4_ACE_MASK_ALL);
2590 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2591 if (status)
2592 goto out;
2593 }
2594 }
2595 out_acl:
2596 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2597 p = xdr_reserve_space(xdr, 4);
2598 if (!p)
2599 goto out_resource;
2600 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2601 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2602 }
2603 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2604 p = xdr_reserve_space(xdr, 4);
2605 if (!p)
2606 goto out_resource;
2607 *p++ = cpu_to_be32(1);
2608 }
2609 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2610 p = xdr_reserve_space(xdr, 4);
2611 if (!p)
2612 goto out_resource;
2613 *p++ = cpu_to_be32(0);
2614 }
2615 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2616 p = xdr_reserve_space(xdr, 4);
2617 if (!p)
2618 goto out_resource;
2619 *p++ = cpu_to_be32(1);
2620 }
2621 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2622 p = xdr_reserve_space(xdr, 4);
2623 if (!p)
2624 goto out_resource;
2625 *p++ = cpu_to_be32(1);
2626 }
2627 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2628 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2629 if (!p)
2630 goto out_resource;
2631 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2632 fhp->fh_handle.fh_size);
2633 }
2634 if (bmval0 & FATTR4_WORD0_FILEID) {
2635 p = xdr_reserve_space(xdr, 8);
2636 if (!p)
2637 goto out_resource;
2638 p = xdr_encode_hyper(p, stat.ino);
2639 }
2640 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2641 p = xdr_reserve_space(xdr, 8);
2642 if (!p)
2643 goto out_resource;
2644 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2645 }
2646 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2647 p = xdr_reserve_space(xdr, 8);
2648 if (!p)
2649 goto out_resource;
2650 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2651 }
2652 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2653 p = xdr_reserve_space(xdr, 8);
2654 if (!p)
2655 goto out_resource;
2656 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2657 }
2658 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2659 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2660 if (status)
2661 goto out;
2662 }
2663 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2664 p = xdr_reserve_space(xdr, 4);
2665 if (!p)
2666 goto out_resource;
2667 *p++ = cpu_to_be32(1);
2668 }
2669 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2670 p = xdr_reserve_space(xdr, 8);
2671 if (!p)
2672 goto out_resource;
2673 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2674 }
2675 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2676 p = xdr_reserve_space(xdr, 4);
2677 if (!p)
2678 goto out_resource;
2679 *p++ = cpu_to_be32(255);
2680 }
2681 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2682 p = xdr_reserve_space(xdr, 4);
2683 if (!p)
2684 goto out_resource;
2685 *p++ = cpu_to_be32(statfs.f_namelen);
2686 }
2687 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2688 p = xdr_reserve_space(xdr, 8);
2689 if (!p)
2690 goto out_resource;
2691 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2692 }
2693 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2694 p = xdr_reserve_space(xdr, 8);
2695 if (!p)
2696 goto out_resource;
2697 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2698 }
2699 if (bmval1 & FATTR4_WORD1_MODE) {
2700 p = xdr_reserve_space(xdr, 4);
2701 if (!p)
2702 goto out_resource;
2703 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2704 }
2705 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2706 p = xdr_reserve_space(xdr, 4);
2707 if (!p)
2708 goto out_resource;
2709 *p++ = cpu_to_be32(1);
2710 }
2711 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2712 p = xdr_reserve_space(xdr, 4);
2713 if (!p)
2714 goto out_resource;
2715 *p++ = cpu_to_be32(stat.nlink);
2716 }
2717 if (bmval1 & FATTR4_WORD1_OWNER) {
2718 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2719 if (status)
2720 goto out;
2721 }
2722 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2723 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2724 if (status)
2725 goto out;
2726 }
2727 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2728 p = xdr_reserve_space(xdr, 8);
2729 if (!p)
2730 goto out_resource;
2731 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2732 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2733 }
2734 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2735 p = xdr_reserve_space(xdr, 8);
2736 if (!p)
2737 goto out_resource;
2738 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2739 p = xdr_encode_hyper(p, dummy64);
2740 }
2741 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2742 p = xdr_reserve_space(xdr, 8);
2743 if (!p)
2744 goto out_resource;
2745 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2746 p = xdr_encode_hyper(p, dummy64);
2747 }
2748 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2749 p = xdr_reserve_space(xdr, 8);
2750 if (!p)
2751 goto out_resource;
2752 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2753 p = xdr_encode_hyper(p, dummy64);
2754 }
2755 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2756 p = xdr_reserve_space(xdr, 8);
2757 if (!p)
2758 goto out_resource;
2759 dummy64 = (u64)stat.blocks << 9;
2760 p = xdr_encode_hyper(p, dummy64);
2761 }
2762 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2763 p = xdr_reserve_space(xdr, 12);
2764 if (!p)
2765 goto out_resource;
2766 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2767 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2768 }
2769 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2770 p = xdr_reserve_space(xdr, 12);
2771 if (!p)
2772 goto out_resource;
2773 *p++ = cpu_to_be32(0);
2774 *p++ = cpu_to_be32(1);
2775 *p++ = cpu_to_be32(0);
2776 }
2777 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2778 p = xdr_reserve_space(xdr, 12);
2779 if (!p)
2780 goto out_resource;
2781 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2782 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2783 }
2784 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2785 p = xdr_reserve_space(xdr, 12);
2786 if (!p)
2787 goto out_resource;
2788 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2789 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2790 }
2791 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2792 struct kstat parent_stat;
2793 u64 ino = stat.ino;
2794
2795 p = xdr_reserve_space(xdr, 8);
2796 if (!p)
2797 goto out_resource;
2798 /*
2799 * Get parent's attributes if not ignoring crossmount
2800 * and this is the root of a cross-mounted filesystem.
2801 */
2802 if (ignore_crossmnt == 0 &&
2803 dentry == exp->ex_path.mnt->mnt_root) {
2804 err = get_parent_attributes(exp, &parent_stat);
2805 if (err)
2806 goto out_nfserr;
2807 ino = parent_stat.ino;
2808 }
2809 p = xdr_encode_hyper(p, ino);
2810 }
2811 #ifdef CONFIG_NFSD_PNFS
2812 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2813 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2814 if (status)
2815 goto out;
2816 }
2817
2818 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2819 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2820 if (status)
2821 goto out;
2822 }
2823
2824 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2825 p = xdr_reserve_space(xdr, 4);
2826 if (!p)
2827 goto out_resource;
2828 *p++ = cpu_to_be32(stat.blksize);
2829 }
2830 #endif /* CONFIG_NFSD_PNFS */
2831 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2832 u32 supp[3];
2833
2834 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2835 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2836 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2837 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2838
2839 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2840 if (status)
2841 goto out;
2842 }
2843
2844 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2845 status = nfsd4_encode_security_label(xdr, rqstp, context,
2846 contextlen);
2847 if (status)
2848 goto out;
2849 }
2850
2851 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2852 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2853 status = nfs_ok;
2854
2855 out:
2856 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2857 if (context)
2858 security_release_secctx(context, contextlen);
2859 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2860 kfree(acl);
2861 if (tempfh) {
2862 fh_put(tempfh);
2863 kfree(tempfh);
2864 }
2865 if (status)
2866 xdr_truncate_encode(xdr, starting_len);
2867 return status;
2868 out_nfserr:
2869 status = nfserrno(err);
2870 goto out;
2871 out_resource:
2872 status = nfserr_resource;
2873 goto out;
2874 }
2875
2876 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2877 struct xdr_buf *buf, __be32 *p, int bytes)
2878 {
2879 xdr->scratch.iov_len = 0;
2880 memset(buf, 0, sizeof(struct xdr_buf));
2881 buf->head[0].iov_base = p;
2882 buf->head[0].iov_len = 0;
2883 buf->len = 0;
2884 xdr->buf = buf;
2885 xdr->iov = buf->head;
2886 xdr->p = p;
2887 xdr->end = (void *)p + bytes;
2888 buf->buflen = bytes;
2889 }
2890
2891 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2892 struct svc_fh *fhp, struct svc_export *exp,
2893 struct dentry *dentry, u32 *bmval,
2894 struct svc_rqst *rqstp, int ignore_crossmnt)
2895 {
2896 struct xdr_buf dummy;
2897 struct xdr_stream xdr;
2898 __be32 ret;
2899
2900 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2901 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2902 ignore_crossmnt);
2903 *p = xdr.p;
2904 return ret;
2905 }
2906
2907 static inline int attributes_need_mount(u32 *bmval)
2908 {
2909 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2910 return 1;
2911 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2912 return 1;
2913 return 0;
2914 }
2915
2916 static __be32
2917 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2918 const char *name, int namlen)
2919 {
2920 struct svc_export *exp = cd->rd_fhp->fh_export;
2921 struct dentry *dentry;
2922 __be32 nfserr;
2923 int ignore_crossmnt = 0;
2924
2925 dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2926 if (IS_ERR(dentry))
2927 return nfserrno(PTR_ERR(dentry));
2928 if (d_really_is_negative(dentry)) {
2929 /*
2930 * we're not holding the i_mutex here, so there's
2931 * a window where this directory entry could have gone
2932 * away.
2933 */
2934 dput(dentry);
2935 return nfserr_noent;
2936 }
2937
2938 exp_get(exp);
2939 /*
2940 * In the case of a mountpoint, the client may be asking for
2941 * attributes that are only properties of the underlying filesystem
2942 * as opposed to the cross-mounted file system. In such a case,
2943 * we will not follow the cross mount and will fill the attribtutes
2944 * directly from the mountpoint dentry.
2945 */
2946 if (nfsd_mountpoint(dentry, exp)) {
2947 int err;
2948
2949 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2950 && !attributes_need_mount(cd->rd_bmval)) {
2951 ignore_crossmnt = 1;
2952 goto out_encode;
2953 }
2954 /*
2955 * Why the heck aren't we just using nfsd_lookup??
2956 * Different "."/".." handling? Something else?
2957 * At least, add a comment here to explain....
2958 */
2959 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2960 if (err) {
2961 nfserr = nfserrno(err);
2962 goto out_put;
2963 }
2964 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2965 if (nfserr)
2966 goto out_put;
2967
2968 }
2969 out_encode:
2970 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2971 cd->rd_rqstp, ignore_crossmnt);
2972 out_put:
2973 dput(dentry);
2974 exp_put(exp);
2975 return nfserr;
2976 }
2977
2978 static __be32 *
2979 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2980 {
2981 __be32 *p;
2982
2983 p = xdr_reserve_space(xdr, 20);
2984 if (!p)
2985 return NULL;
2986 *p++ = htonl(2);
2987 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2988 *p++ = htonl(0); /* bmval1 */
2989
2990 *p++ = htonl(4); /* attribute length */
2991 *p++ = nfserr; /* no htonl */
2992 return p;
2993 }
2994
2995 static int
2996 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2997 loff_t offset, u64 ino, unsigned int d_type)
2998 {
2999 struct readdir_cd *ccd = ccdv;
3000 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3001 struct xdr_stream *xdr = cd->xdr;
3002 int start_offset = xdr->buf->len;
3003 int cookie_offset;
3004 u32 name_and_cookie;
3005 int entry_bytes;
3006 __be32 nfserr = nfserr_toosmall;
3007 __be64 wire_offset;
3008 __be32 *p;
3009
3010 /* In nfsv4, "." and ".." never make it onto the wire.. */
3011 if (name && isdotent(name, namlen)) {
3012 cd->common.err = nfs_ok;
3013 return 0;
3014 }
3015
3016 if (cd->cookie_offset) {
3017 wire_offset = cpu_to_be64(offset);
3018 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3019 &wire_offset, 8);
3020 }
3021
3022 p = xdr_reserve_space(xdr, 4);
3023 if (!p)
3024 goto fail;
3025 *p++ = xdr_one; /* mark entry present */
3026 cookie_offset = xdr->buf->len;
3027 p = xdr_reserve_space(xdr, 3*4 + namlen);
3028 if (!p)
3029 goto fail;
3030 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
3031 p = xdr_encode_array(p, name, namlen); /* name length & name */
3032
3033 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3034 switch (nfserr) {
3035 case nfs_ok:
3036 break;
3037 case nfserr_resource:
3038 nfserr = nfserr_toosmall;
3039 goto fail;
3040 case nfserr_noent:
3041 xdr_truncate_encode(xdr, start_offset);
3042 goto skip_entry;
3043 default:
3044 /*
3045 * If the client requested the RDATTR_ERROR attribute,
3046 * we stuff the error code into this attribute
3047 * and continue. If this attribute was not requested,
3048 * then in accordance with the spec, we fail the
3049 * entire READDIR operation(!)
3050 */
3051 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3052 goto fail;
3053 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3054 if (p == NULL) {
3055 nfserr = nfserr_toosmall;
3056 goto fail;
3057 }
3058 }
3059 nfserr = nfserr_toosmall;
3060 entry_bytes = xdr->buf->len - start_offset;
3061 if (entry_bytes > cd->rd_maxcount)
3062 goto fail;
3063 cd->rd_maxcount -= entry_bytes;
3064 /*
3065 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3066 * let's always let through the first entry, at least:
3067 */
3068 if (!cd->rd_dircount)
3069 goto fail;
3070 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3071 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3072 goto fail;
3073 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3074
3075 cd->cookie_offset = cookie_offset;
3076 skip_entry:
3077 cd->common.err = nfs_ok;
3078 return 0;
3079 fail:
3080 xdr_truncate_encode(xdr, start_offset);
3081 cd->common.err = nfserr;
3082 return -EINVAL;
3083 }
3084
3085 static __be32
3086 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3087 {
3088 __be32 *p;
3089
3090 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3091 if (!p)
3092 return nfserr_resource;
3093 *p++ = cpu_to_be32(sid->si_generation);
3094 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3095 sizeof(stateid_opaque_t));
3096 return 0;
3097 }
3098
3099 static __be32
3100 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3101 {
3102 struct xdr_stream *xdr = &resp->xdr;
3103 __be32 *p;
3104
3105 if (!nfserr) {
3106 p = xdr_reserve_space(xdr, 8);
3107 if (!p)
3108 return nfserr_resource;
3109 *p++ = cpu_to_be32(access->ac_supported);
3110 *p++ = cpu_to_be32(access->ac_resp_access);
3111 }
3112 return nfserr;
3113 }
3114
3115 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3116 {
3117 struct xdr_stream *xdr = &resp->xdr;
3118 __be32 *p;
3119
3120 if (!nfserr) {
3121 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3122 if (!p)
3123 return nfserr_resource;
3124 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3125 NFS4_MAX_SESSIONID_LEN);
3126 *p++ = cpu_to_be32(bcts->dir);
3127 /* Upshifting from TCP to RDMA is not supported */
3128 *p++ = cpu_to_be32(0);
3129 }
3130 return nfserr;
3131 }
3132
3133 static __be32
3134 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3135 {
3136 struct xdr_stream *xdr = &resp->xdr;
3137
3138 if (!nfserr)
3139 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3140
3141 return nfserr;
3142 }
3143
3144
3145 static __be32
3146 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3147 {
3148 struct xdr_stream *xdr = &resp->xdr;
3149 __be32 *p;
3150
3151 if (!nfserr) {
3152 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3153 if (!p)
3154 return nfserr_resource;
3155 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3156 NFS4_VERIFIER_SIZE);
3157 }
3158 return nfserr;
3159 }
3160
3161 static __be32
3162 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3163 {
3164 struct xdr_stream *xdr = &resp->xdr;
3165 __be32 *p;
3166
3167 if (!nfserr) {
3168 p = xdr_reserve_space(xdr, 20);
3169 if (!p)
3170 return nfserr_resource;
3171 encode_cinfo(p, &create->cr_cinfo);
3172 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3173 create->cr_bmval[1], create->cr_bmval[2]);
3174 }
3175 return nfserr;
3176 }
3177
3178 static __be32
3179 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3180 {
3181 struct svc_fh *fhp = getattr->ga_fhp;
3182 struct xdr_stream *xdr = &resp->xdr;
3183
3184 if (nfserr)
3185 return nfserr;
3186
3187 nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3188 getattr->ga_bmval,
3189 resp->rqstp, 0);
3190 return nfserr;
3191 }
3192
3193 static __be32
3194 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3195 {
3196 struct xdr_stream *xdr = &resp->xdr;
3197 struct svc_fh *fhp = *fhpp;
3198 unsigned int len;
3199 __be32 *p;
3200
3201 if (!nfserr) {
3202 len = fhp->fh_handle.fh_size;
3203 p = xdr_reserve_space(xdr, len + 4);
3204 if (!p)
3205 return nfserr_resource;
3206 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3207 }
3208 return nfserr;
3209 }
3210
3211 /*
3212 * Including all fields other than the name, a LOCK4denied structure requires
3213 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3214 */
3215 static __be32
3216 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3217 {
3218 struct xdr_netobj *conf = &ld->ld_owner;
3219 __be32 *p;
3220
3221 again:
3222 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3223 if (!p) {
3224 /*
3225 * Don't fail to return the result just because we can't
3226 * return the conflicting open:
3227 */
3228 if (conf->len) {
3229 kfree(conf->data);
3230 conf->len = 0;
3231 conf->data = NULL;
3232 goto again;
3233 }
3234 return nfserr_resource;
3235 }
3236 p = xdr_encode_hyper(p, ld->ld_start);
3237 p = xdr_encode_hyper(p, ld->ld_length);
3238 *p++ = cpu_to_be32(ld->ld_type);
3239 if (conf->len) {
3240 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3241 p = xdr_encode_opaque(p, conf->data, conf->len);
3242 kfree(conf->data);
3243 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
3244 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3245 *p++ = cpu_to_be32(0); /* length of owner name */
3246 }
3247 return nfserr_denied;
3248 }
3249
3250 static __be32
3251 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3252 {
3253 struct xdr_stream *xdr = &resp->xdr;
3254
3255 if (!nfserr)
3256 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3257 else if (nfserr == nfserr_denied)
3258 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3259
3260 return nfserr;
3261 }
3262
3263 static __be32
3264 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3265 {
3266 struct xdr_stream *xdr = &resp->xdr;
3267
3268 if (nfserr == nfserr_denied)
3269 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3270 return nfserr;
3271 }
3272
3273 static __be32
3274 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3275 {
3276 struct xdr_stream *xdr = &resp->xdr;
3277
3278 if (!nfserr)
3279 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3280
3281 return nfserr;
3282 }
3283
3284
3285 static __be32
3286 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3287 {
3288 struct xdr_stream *xdr = &resp->xdr;
3289 __be32 *p;
3290
3291 if (!nfserr) {
3292 p = xdr_reserve_space(xdr, 20);
3293 if (!p)
3294 return nfserr_resource;
3295 p = encode_cinfo(p, &link->li_cinfo);
3296 }
3297 return nfserr;
3298 }
3299
3300
3301 static __be32
3302 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3303 {
3304 struct xdr_stream *xdr = &resp->xdr;
3305 __be32 *p;
3306
3307 if (nfserr)
3308 goto out;
3309
3310 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3311 if (nfserr)
3312 goto out;
3313 p = xdr_reserve_space(xdr, 24);
3314 if (!p)
3315 return nfserr_resource;
3316 p = encode_cinfo(p, &open->op_cinfo);
3317 *p++ = cpu_to_be32(open->op_rflags);
3318
3319 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3320 open->op_bmval[2]);
3321 if (nfserr)
3322 goto out;
3323
3324 p = xdr_reserve_space(xdr, 4);
3325 if (!p)
3326 return nfserr_resource;
3327
3328 *p++ = cpu_to_be32(open->op_delegate_type);
3329 switch (open->op_delegate_type) {
3330 case NFS4_OPEN_DELEGATE_NONE:
3331 break;
3332 case NFS4_OPEN_DELEGATE_READ:
3333 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3334 if (nfserr)
3335 return nfserr;
3336 p = xdr_reserve_space(xdr, 20);
3337 if (!p)
3338 return nfserr_resource;
3339 *p++ = cpu_to_be32(open->op_recall);
3340
3341 /*
3342 * TODO: ACE's in delegations
3343 */
3344 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3345 *p++ = cpu_to_be32(0);
3346 *p++ = cpu_to_be32(0);
3347 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3348 break;
3349 case NFS4_OPEN_DELEGATE_WRITE:
3350 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3351 if (nfserr)
3352 return nfserr;
3353 p = xdr_reserve_space(xdr, 32);
3354 if (!p)
3355 return nfserr_resource;
3356 *p++ = cpu_to_be32(0);
3357
3358 /*
3359 * TODO: space_limit's in delegations
3360 */
3361 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3362 *p++ = cpu_to_be32(~(u32)0);
3363 *p++ = cpu_to_be32(~(u32)0);
3364
3365 /*
3366 * TODO: ACE's in delegations
3367 */
3368 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3369 *p++ = cpu_to_be32(0);
3370 *p++ = cpu_to_be32(0);
3371 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3372 break;
3373 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3374 switch (open->op_why_no_deleg) {
3375 case WND4_CONTENTION:
3376 case WND4_RESOURCE:
3377 p = xdr_reserve_space(xdr, 8);
3378 if (!p)
3379 return nfserr_resource;
3380 *p++ = cpu_to_be32(open->op_why_no_deleg);
3381 /* deleg signaling not supported yet: */
3382 *p++ = cpu_to_be32(0);
3383 break;
3384 default:
3385 p = xdr_reserve_space(xdr, 4);
3386 if (!p)
3387 return nfserr_resource;
3388 *p++ = cpu_to_be32(open->op_why_no_deleg);
3389 }
3390 break;
3391 default:
3392 BUG();
3393 }
3394 /* XXX save filehandle here */
3395 out:
3396 return nfserr;
3397 }
3398
3399 static __be32
3400 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3401 {
3402 struct xdr_stream *xdr = &resp->xdr;
3403
3404 if (!nfserr)
3405 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3406
3407 return nfserr;
3408 }
3409
3410 static __be32
3411 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3412 {
3413 struct xdr_stream *xdr = &resp->xdr;
3414
3415 if (!nfserr)
3416 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3417
3418 return nfserr;
3419 }
3420
3421 static __be32 nfsd4_encode_splice_read(
3422 struct nfsd4_compoundres *resp,
3423 struct nfsd4_read *read,
3424 struct file *file, unsigned long maxcount)
3425 {
3426 struct xdr_stream *xdr = &resp->xdr;
3427 struct xdr_buf *buf = xdr->buf;
3428 u32 eof;
3429 long len;
3430 int space_left;
3431 __be32 nfserr;
3432 __be32 *p = xdr->p - 2;
3433
3434 /* Make sure there will be room for padding if needed */
3435 if (xdr->end - xdr->p < 1)
3436 return nfserr_resource;
3437
3438 len = maxcount;
3439 nfserr = nfsd_splice_read(read->rd_rqstp, file,
3440 read->rd_offset, &maxcount);
3441 if (nfserr) {
3442 /*
3443 * nfsd_splice_actor may have already messed with the
3444 * page length; reset it so as not to confuse
3445 * xdr_truncate_encode:
3446 */
3447 buf->page_len = 0;
3448 return nfserr;
3449 }
3450
3451 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3452 d_inode(read->rd_fhp->fh_dentry)->i_size);
3453
3454 *(p++) = htonl(eof);
3455 *(p++) = htonl(maxcount);
3456
3457 buf->page_len = maxcount;
3458 buf->len += maxcount;
3459 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3460 / PAGE_SIZE;
3461
3462 /* Use rest of head for padding and remaining ops: */
3463 buf->tail[0].iov_base = xdr->p;
3464 buf->tail[0].iov_len = 0;
3465 xdr->iov = buf->tail;
3466 if (maxcount&3) {
3467 int pad = 4 - (maxcount&3);
3468
3469 *(xdr->p++) = 0;
3470
3471 buf->tail[0].iov_base += maxcount&3;
3472 buf->tail[0].iov_len = pad;
3473 buf->len += pad;
3474 }
3475
3476 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3477 buf->buflen - buf->len);
3478 buf->buflen = buf->len + space_left;
3479 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3480
3481 return 0;
3482 }
3483
3484 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3485 struct nfsd4_read *read,
3486 struct file *file, unsigned long maxcount)
3487 {
3488 struct xdr_stream *xdr = &resp->xdr;
3489 u32 eof;
3490 int v;
3491 int starting_len = xdr->buf->len - 8;
3492 long len;
3493 int thislen;
3494 __be32 nfserr;
3495 __be32 tmp;
3496 __be32 *p;
3497 u32 zzz = 0;
3498 int pad;
3499
3500 len = maxcount;
3501 v = 0;
3502
3503 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3504 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3505 WARN_ON_ONCE(!p);
3506 resp->rqstp->rq_vec[v].iov_base = p;
3507 resp->rqstp->rq_vec[v].iov_len = thislen;
3508 v++;
3509 len -= thislen;
3510
3511 while (len) {
3512 thislen = min_t(long, len, PAGE_SIZE);
3513 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3514 WARN_ON_ONCE(!p);
3515 resp->rqstp->rq_vec[v].iov_base = p;
3516 resp->rqstp->rq_vec[v].iov_len = thislen;
3517 v++;
3518 len -= thislen;
3519 }
3520 read->rd_vlen = v;
3521
3522 len = maxcount;
3523 nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3524 read->rd_vlen, &maxcount);
3525 if (nfserr)
3526 return nfserr;
3527 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3528
3529 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3530 d_inode(read->rd_fhp->fh_dentry)->i_size);
3531
3532 tmp = htonl(eof);
3533 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3534 tmp = htonl(maxcount);
3535 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3536
3537 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3538 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3539 &zzz, pad);
3540 return 0;
3541
3542 }
3543
3544 static __be32
3545 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3546 struct nfsd4_read *read)
3547 {
3548 unsigned long maxcount;
3549 struct xdr_stream *xdr = &resp->xdr;
3550 struct file *file = read->rd_filp;
3551 int starting_len = xdr->buf->len;
3552 struct raparms *ra = NULL;
3553 __be32 *p;
3554
3555 if (nfserr)
3556 goto out;
3557
3558 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3559 if (!p) {
3560 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3561 nfserr = nfserr_resource;
3562 goto out;
3563 }
3564 if (resp->xdr.buf->page_len &&
3565 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3566 WARN_ON_ONCE(1);
3567 nfserr = nfserr_resource;
3568 goto out;
3569 }
3570 xdr_commit_encode(xdr);
3571
3572 maxcount = svc_max_payload(resp->rqstp);
3573 maxcount = min_t(unsigned long, maxcount,
3574 (xdr->buf->buflen - xdr->buf->len));
3575 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3576
3577 if (read->rd_tmp_file)
3578 ra = nfsd_init_raparms(file);
3579
3580 if (file->f_op->splice_read &&
3581 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3582 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3583 else
3584 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3585
3586 if (ra)
3587 nfsd_put_raparams(file, ra);
3588
3589 if (nfserr)
3590 xdr_truncate_encode(xdr, starting_len);
3591
3592 out:
3593 if (file)
3594 fput(file);
3595 return nfserr;
3596 }
3597
3598 static __be32
3599 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3600 {
3601 int maxcount;
3602 __be32 wire_count;
3603 int zero = 0;
3604 struct xdr_stream *xdr = &resp->xdr;
3605 int length_offset = xdr->buf->len;
3606 __be32 *p;
3607
3608 if (nfserr)
3609 return nfserr;
3610
3611 p = xdr_reserve_space(xdr, 4);
3612 if (!p)
3613 return nfserr_resource;
3614 maxcount = PAGE_SIZE;
3615
3616 p = xdr_reserve_space(xdr, maxcount);
3617 if (!p)
3618 return nfserr_resource;
3619 /*
3620 * XXX: By default, vfs_readlink() will truncate symlinks if they
3621 * would overflow the buffer. Is this kosher in NFSv4? If not, one
3622 * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3623 * that truncation occurred, and return NFS4ERR_RESOURCE.
3624 */
3625 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3626 (char *)p, &maxcount);
3627 if (nfserr == nfserr_isdir)
3628 nfserr = nfserr_inval;
3629 if (nfserr) {
3630 xdr_truncate_encode(xdr, length_offset);
3631 return nfserr;
3632 }
3633
3634 wire_count = htonl(maxcount);
3635 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3636 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3637 if (maxcount & 3)
3638 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3639 &zero, 4 - (maxcount&3));
3640 return 0;
3641 }
3642
3643 static __be32
3644 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3645 {
3646 int maxcount;
3647 int bytes_left;
3648 loff_t offset;
3649 __be64 wire_offset;
3650 struct xdr_stream *xdr = &resp->xdr;
3651 int starting_len = xdr->buf->len;
3652 __be32 *p;
3653
3654 if (nfserr)
3655 return nfserr;
3656
3657 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3658 if (!p)
3659 return nfserr_resource;
3660
3661 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3662 *p++ = cpu_to_be32(0);
3663 *p++ = cpu_to_be32(0);
3664 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3665 - (char *)resp->xdr.buf->head[0].iov_base;
3666
3667 /*
3668 * Number of bytes left for directory entries allowing for the
3669 * final 8 bytes of the readdir and a following failed op:
3670 */
3671 bytes_left = xdr->buf->buflen - xdr->buf->len
3672 - COMPOUND_ERR_SLACK_SPACE - 8;
3673 if (bytes_left < 0) {
3674 nfserr = nfserr_resource;
3675 goto err_no_verf;
3676 }
3677 maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3678 /*
3679 * Note the rfc defines rd_maxcount as the size of the
3680 * READDIR4resok structure, which includes the verifier above
3681 * and the 8 bytes encoded at the end of this function:
3682 */
3683 if (maxcount < 16) {
3684 nfserr = nfserr_toosmall;
3685 goto err_no_verf;
3686 }
3687 maxcount = min_t(int, maxcount-16, bytes_left);
3688
3689 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3690 if (!readdir->rd_dircount)
3691 readdir->rd_dircount = INT_MAX;
3692
3693 readdir->xdr = xdr;
3694 readdir->rd_maxcount = maxcount;
3695 readdir->common.err = 0;
3696 readdir->cookie_offset = 0;
3697
3698 offset = readdir->rd_cookie;
3699 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3700 &offset,
3701 &readdir->common, nfsd4_encode_dirent);
3702 if (nfserr == nfs_ok &&
3703 readdir->common.err == nfserr_toosmall &&
3704 xdr->buf->len == starting_len + 8) {
3705 /* nothing encoded; which limit did we hit?: */
3706 if (maxcount - 16 < bytes_left)
3707 /* It was the fault of rd_maxcount: */
3708 nfserr = nfserr_toosmall;
3709 else
3710 /* We ran out of buffer space: */
3711 nfserr = nfserr_resource;
3712 }
3713 if (nfserr)
3714 goto err_no_verf;
3715
3716 if (readdir->cookie_offset) {
3717 wire_offset = cpu_to_be64(offset);
3718 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3719 &wire_offset, 8);
3720 }
3721
3722 p = xdr_reserve_space(xdr, 8);
3723 if (!p) {
3724 WARN_ON_ONCE(1);
3725 goto err_no_verf;
3726 }
3727 *p++ = 0; /* no more entries */
3728 *p++ = htonl(readdir->common.err == nfserr_eof);
3729
3730 return 0;
3731 err_no_verf:
3732 xdr_truncate_encode(xdr, starting_len);
3733 return nfserr;
3734 }
3735
3736 static __be32
3737 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3738 {
3739 struct xdr_stream *xdr = &resp->xdr;
3740 __be32 *p;
3741
3742 if (!nfserr) {
3743 p = xdr_reserve_space(xdr, 20);
3744 if (!p)
3745 return nfserr_resource;
3746 p = encode_cinfo(p, &remove->rm_cinfo);
3747 }
3748 return nfserr;
3749 }
3750
3751 static __be32
3752 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3753 {
3754 struct xdr_stream *xdr = &resp->xdr;
3755 __be32 *p;
3756
3757 if (!nfserr) {
3758 p = xdr_reserve_space(xdr, 40);
3759 if (!p)
3760 return nfserr_resource;
3761 p = encode_cinfo(p, &rename->rn_sinfo);
3762 p = encode_cinfo(p, &rename->rn_tinfo);
3763 }
3764 return nfserr;
3765 }
3766
3767 static __be32
3768 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3769 __be32 nfserr, struct svc_export *exp)
3770 {
3771 u32 i, nflavs, supported;
3772 struct exp_flavor_info *flavs;
3773 struct exp_flavor_info def_flavs[2];
3774 __be32 *p, *flavorsp;
3775 static bool report = true;
3776
3777 if (nfserr)
3778 goto out;
3779 nfserr = nfserr_resource;
3780 if (exp->ex_nflavors) {
3781 flavs = exp->ex_flavors;
3782 nflavs = exp->ex_nflavors;
3783 } else { /* Handling of some defaults in absence of real secinfo: */
3784 flavs = def_flavs;
3785 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3786 nflavs = 2;
3787 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3788 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3789 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3790 nflavs = 1;
3791 flavs[0].pseudoflavor
3792 = svcauth_gss_flavor(exp->ex_client);
3793 } else {
3794 nflavs = 1;
3795 flavs[0].pseudoflavor
3796 = exp->ex_client->flavour->flavour;
3797 }
3798 }
3799
3800 supported = 0;
3801 p = xdr_reserve_space(xdr, 4);
3802 if (!p)
3803 goto out;
3804 flavorsp = p++; /* to be backfilled later */
3805
3806 for (i = 0; i < nflavs; i++) {
3807 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3808 struct rpcsec_gss_info info;
3809
3810 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3811 supported++;
3812 p = xdr_reserve_space(xdr, 4 + 4 +
3813 XDR_LEN(info.oid.len) + 4 + 4);
3814 if (!p)
3815 goto out;
3816 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3817 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3818 *p++ = cpu_to_be32(info.qop);
3819 *p++ = cpu_to_be32(info.service);
3820 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3821 supported++;
3822 p = xdr_reserve_space(xdr, 4);
3823 if (!p)
3824 goto out;
3825 *p++ = cpu_to_be32(pf);
3826 } else {
3827 if (report)
3828 pr_warn("NFS: SECINFO: security flavor %u "
3829 "is not supported\n", pf);
3830 }
3831 }
3832
3833 if (nflavs != supported)
3834 report = false;
3835 *flavorsp = htonl(supported);
3836 nfserr = 0;
3837 out:
3838 if (exp)
3839 exp_put(exp);
3840 return nfserr;
3841 }
3842
3843 static __be32
3844 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3845 struct nfsd4_secinfo *secinfo)
3846 {
3847 struct xdr_stream *xdr = &resp->xdr;
3848
3849 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3850 }
3851
3852 static __be32
3853 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3854 struct nfsd4_secinfo_no_name *secinfo)
3855 {
3856 struct xdr_stream *xdr = &resp->xdr;
3857
3858 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3859 }
3860
3861 /*
3862 * The SETATTR encode routine is special -- it always encodes a bitmap,
3863 * regardless of the error status.
3864 */
3865 static __be32
3866 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3867 {
3868 struct xdr_stream *xdr = &resp->xdr;
3869 __be32 *p;
3870
3871 p = xdr_reserve_space(xdr, 16);
3872 if (!p)
3873 return nfserr_resource;
3874 if (nfserr) {
3875 *p++ = cpu_to_be32(3);
3876 *p++ = cpu_to_be32(0);
3877 *p++ = cpu_to_be32(0);
3878 *p++ = cpu_to_be32(0);
3879 }
3880 else {
3881 *p++ = cpu_to_be32(3);
3882 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3883 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3884 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3885 }
3886 return nfserr;
3887 }
3888
3889 static __be32
3890 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3891 {
3892 struct xdr_stream *xdr = &resp->xdr;
3893 __be32 *p;
3894
3895 if (!nfserr) {
3896 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3897 if (!p)
3898 return nfserr_resource;
3899 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3900 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3901 NFS4_VERIFIER_SIZE);
3902 }
3903 else if (nfserr == nfserr_clid_inuse) {
3904 p = xdr_reserve_space(xdr, 8);
3905 if (!p)
3906 return nfserr_resource;
3907 *p++ = cpu_to_be32(0);
3908 *p++ = cpu_to_be32(0);
3909 }
3910 return nfserr;
3911 }
3912
3913 static __be32
3914 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3915 {
3916 struct xdr_stream *xdr = &resp->xdr;
3917 __be32 *p;
3918
3919 if (!nfserr) {
3920 p = xdr_reserve_space(xdr, 16);
3921 if (!p)
3922 return nfserr_resource;
3923 *p++ = cpu_to_be32(write->wr_bytes_written);
3924 *p++ = cpu_to_be32(write->wr_how_written);
3925 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3926 NFS4_VERIFIER_SIZE);
3927 }
3928 return nfserr;
3929 }
3930
3931 static __be32
3932 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3933 struct nfsd4_exchange_id *exid)
3934 {
3935 struct xdr_stream *xdr = &resp->xdr;
3936 __be32 *p;
3937 char *major_id;
3938 char *server_scope;
3939 int major_id_sz;
3940 int server_scope_sz;
3941 int status = 0;
3942 uint64_t minor_id = 0;
3943
3944 if (nfserr)
3945 return nfserr;
3946
3947 major_id = utsname()->nodename;
3948 major_id_sz = strlen(major_id);
3949 server_scope = utsname()->nodename;
3950 server_scope_sz = strlen(server_scope);
3951
3952 p = xdr_reserve_space(xdr,
3953 8 /* eir_clientid */ +
3954 4 /* eir_sequenceid */ +
3955 4 /* eir_flags */ +
3956 4 /* spr_how */);
3957 if (!p)
3958 return nfserr_resource;
3959
3960 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3961 *p++ = cpu_to_be32(exid->seqid);
3962 *p++ = cpu_to_be32(exid->flags);
3963
3964 *p++ = cpu_to_be32(exid->spa_how);
3965
3966 switch (exid->spa_how) {
3967 case SP4_NONE:
3968 break;
3969 case SP4_MACH_CRED:
3970 /* spo_must_enforce bitmap: */
3971 status = nfsd4_encode_bitmap(xdr,
3972 exid->spo_must_enforce[0],
3973 exid->spo_must_enforce[1],
3974 exid->spo_must_enforce[2]);
3975 if (status)
3976 goto out;
3977 /* spo_must_allow bitmap: */
3978 status = nfsd4_encode_bitmap(xdr,
3979 exid->spo_must_allow[0],
3980 exid->spo_must_allow[1],
3981 exid->spo_must_allow[2]);
3982 if (status)
3983 goto out;
3984 break;
3985 default:
3986 WARN_ON_ONCE(1);
3987 }
3988
3989 p = xdr_reserve_space(xdr,
3990 8 /* so_minor_id */ +
3991 4 /* so_major_id.len */ +
3992 (XDR_QUADLEN(major_id_sz) * 4) +
3993 4 /* eir_server_scope.len */ +
3994 (XDR_QUADLEN(server_scope_sz) * 4) +
3995 4 /* eir_server_impl_id.count (0) */);
3996 if (!p)
3997 return nfserr_resource;
3998
3999 /* The server_owner struct */
4000 p = xdr_encode_hyper(p, minor_id); /* Minor id */
4001 /* major id */
4002 p = xdr_encode_opaque(p, major_id, major_id_sz);
4003
4004 /* Server scope */
4005 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4006
4007 /* Implementation id */
4008 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
4009 return 0;
4010 out:
4011 return status;
4012 }
4013
4014 static __be32
4015 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4016 struct nfsd4_create_session *sess)
4017 {
4018 struct xdr_stream *xdr = &resp->xdr;
4019 __be32 *p;
4020
4021 if (nfserr)
4022 return nfserr;
4023
4024 p = xdr_reserve_space(xdr, 24);
4025 if (!p)
4026 return nfserr_resource;
4027 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4028 NFS4_MAX_SESSIONID_LEN);
4029 *p++ = cpu_to_be32(sess->seqid);
4030 *p++ = cpu_to_be32(sess->flags);
4031
4032 p = xdr_reserve_space(xdr, 28);
4033 if (!p)
4034 return nfserr_resource;
4035 *p++ = cpu_to_be32(0); /* headerpadsz */
4036 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4037 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4038 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4039 *p++ = cpu_to_be32(sess->fore_channel.maxops);
4040 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4041 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4042
4043 if (sess->fore_channel.nr_rdma_attrs) {
4044 p = xdr_reserve_space(xdr, 4);
4045 if (!p)
4046 return nfserr_resource;
4047 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4048 }
4049
4050 p = xdr_reserve_space(xdr, 28);
4051 if (!p)
4052 return nfserr_resource;
4053 *p++ = cpu_to_be32(0); /* headerpadsz */
4054 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4055 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4056 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4057 *p++ = cpu_to_be32(sess->back_channel.maxops);
4058 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4059 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4060
4061 if (sess->back_channel.nr_rdma_attrs) {
4062 p = xdr_reserve_space(xdr, 4);
4063 if (!p)
4064 return nfserr_resource;
4065 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4066 }
4067 return 0;
4068 }
4069
4070 static __be32
4071 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4072 struct nfsd4_sequence *seq)
4073 {
4074 struct xdr_stream *xdr = &resp->xdr;
4075 __be32 *p;
4076
4077 if (nfserr)
4078 return nfserr;
4079
4080 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4081 if (!p)
4082 return nfserr_resource;
4083 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4084 NFS4_MAX_SESSIONID_LEN);
4085 *p++ = cpu_to_be32(seq->seqid);
4086 *p++ = cpu_to_be32(seq->slotid);
4087 /* Note slotid's are numbered from zero: */
4088 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4089 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4090 *p++ = cpu_to_be32(seq->status_flags);
4091
4092 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4093 return 0;
4094 }
4095
4096 static __be32
4097 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4098 struct nfsd4_test_stateid *test_stateid)
4099 {
4100 struct xdr_stream *xdr = &resp->xdr;
4101 struct nfsd4_test_stateid_id *stateid, *next;
4102 __be32 *p;
4103
4104 if (nfserr)
4105 return nfserr;
4106
4107 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4108 if (!p)
4109 return nfserr_resource;
4110 *p++ = htonl(test_stateid->ts_num_ids);
4111
4112 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4113 *p++ = stateid->ts_id_status;
4114 }
4115
4116 return nfserr;
4117 }
4118
4119 #ifdef CONFIG_NFSD_PNFS
4120 static __be32
4121 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4122 struct nfsd4_getdeviceinfo *gdev)
4123 {
4124 struct xdr_stream *xdr = &resp->xdr;
4125 const struct nfsd4_layout_ops *ops;
4126 u32 starting_len = xdr->buf->len, needed_len;
4127 __be32 *p;
4128
4129 dprintk("%s: err %d\n", __func__, be32_to_cpu(nfserr));
4130 if (nfserr)
4131 goto out;
4132
4133 nfserr = nfserr_resource;
4134 p = xdr_reserve_space(xdr, 4);
4135 if (!p)
4136 goto out;
4137
4138 *p++ = cpu_to_be32(gdev->gd_layout_type);
4139
4140 /* If maxcount is 0 then just update notifications */
4141 if (gdev->gd_maxcount != 0) {
4142 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4143 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4144 if (nfserr) {
4145 /*
4146 * We don't bother to burden the layout drivers with
4147 * enforcing gd_maxcount, just tell the client to
4148 * come back with a bigger buffer if it's not enough.
4149 */
4150 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4151 goto toosmall;
4152 goto out;
4153 }
4154 }
4155
4156 nfserr = nfserr_resource;
4157 if (gdev->gd_notify_types) {
4158 p = xdr_reserve_space(xdr, 4 + 4);
4159 if (!p)
4160 goto out;
4161 *p++ = cpu_to_be32(1); /* bitmap length */
4162 *p++ = cpu_to_be32(gdev->gd_notify_types);
4163 } else {
4164 p = xdr_reserve_space(xdr, 4);
4165 if (!p)
4166 goto out;
4167 *p++ = 0;
4168 }
4169
4170 nfserr = 0;
4171 out:
4172 kfree(gdev->gd_device);
4173 dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4174 return nfserr;
4175
4176 toosmall:
4177 dprintk("%s: maxcount too small\n", __func__);
4178 needed_len = xdr->buf->len + 4 /* notifications */;
4179 xdr_truncate_encode(xdr, starting_len);
4180 p = xdr_reserve_space(xdr, 4);
4181 if (!p) {
4182 nfserr = nfserr_resource;
4183 } else {
4184 *p++ = cpu_to_be32(needed_len);
4185 nfserr = nfserr_toosmall;
4186 }
4187 goto out;
4188 }
4189
4190 static __be32
4191 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4192 struct nfsd4_layoutget *lgp)
4193 {
4194 struct xdr_stream *xdr = &resp->xdr;
4195 const struct nfsd4_layout_ops *ops;
4196 __be32 *p;
4197
4198 dprintk("%s: err %d\n", __func__, nfserr);
4199 if (nfserr)
4200 goto out;
4201
4202 nfserr = nfserr_resource;
4203 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4204 if (!p)
4205 goto out;
4206
4207 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4208 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4209 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4210 sizeof(stateid_opaque_t));
4211
4212 *p++ = cpu_to_be32(1); /* we always return a single layout */
4213 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4214 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4215 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4216 *p++ = cpu_to_be32(lgp->lg_layout_type);
4217
4218 ops = nfsd4_layout_ops[lgp->lg_layout_type];
4219 nfserr = ops->encode_layoutget(xdr, lgp);
4220 out:
4221 kfree(lgp->lg_content);
4222 return nfserr;
4223 }
4224
4225 static __be32
4226 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4227 struct nfsd4_layoutcommit *lcp)
4228 {
4229 struct xdr_stream *xdr = &resp->xdr;
4230 __be32 *p;
4231
4232 if (nfserr)
4233 return nfserr;
4234
4235 p = xdr_reserve_space(xdr, 4);
4236 if (!p)
4237 return nfserr_resource;
4238 *p++ = cpu_to_be32(lcp->lc_size_chg);
4239 if (lcp->lc_size_chg) {
4240 p = xdr_reserve_space(xdr, 8);
4241 if (!p)
4242 return nfserr_resource;
4243 p = xdr_encode_hyper(p, lcp->lc_newsize);
4244 }
4245
4246 return nfs_ok;
4247 }
4248
4249 static __be32
4250 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4251 struct nfsd4_layoutreturn *lrp)
4252 {
4253 struct xdr_stream *xdr = &resp->xdr;
4254 __be32 *p;
4255
4256 if (nfserr)
4257 return nfserr;
4258
4259 p = xdr_reserve_space(xdr, 4);
4260 if (!p)
4261 return nfserr_resource;
4262 *p++ = cpu_to_be32(lrp->lrs_present);
4263 if (lrp->lrs_present)
4264 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4265 return nfs_ok;
4266 }
4267 #endif /* CONFIG_NFSD_PNFS */
4268
4269 static __be32
4270 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4271 {
4272 __be32 *p;
4273
4274 p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4275 if (!p)
4276 return nfserr_resource;
4277
4278 *p++ = cpu_to_be32(0);
4279 p = xdr_encode_hyper(p, write->wr_bytes_written);
4280 *p++ = cpu_to_be32(write->wr_stable_how);
4281 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4282 NFS4_VERIFIER_SIZE);
4283 return nfs_ok;
4284 }
4285
4286 static __be32
4287 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4288 struct nfsd4_copy *copy)
4289 {
4290 __be32 *p;
4291
4292 if (!nfserr) {
4293 nfserr = nfsd42_encode_write_res(resp, &copy->cp_res);
4294 if (nfserr)
4295 return nfserr;
4296
4297 p = xdr_reserve_space(&resp->xdr, 4 + 4);
4298 *p++ = cpu_to_be32(copy->cp_consecutive);
4299 *p++ = cpu_to_be32(copy->cp_synchronous);
4300 }
4301 return nfserr;
4302 }
4303
4304 static __be32
4305 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4306 struct nfsd4_seek *seek)
4307 {
4308 __be32 *p;
4309
4310 if (nfserr)
4311 return nfserr;
4312
4313 p = xdr_reserve_space(&resp->xdr, 4 + 8);
4314 *p++ = cpu_to_be32(seek->seek_eof);
4315 p = xdr_encode_hyper(p, seek->seek_pos);
4316
4317 return nfserr;
4318 }
4319
4320 static __be32
4321 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4322 {
4323 return nfserr;
4324 }
4325
4326 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4327
4328 /*
4329 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4330 * since we don't need to filter out obsolete ops as this is
4331 * done in the decoding phase.
4332 */
4333 static nfsd4_enc nfsd4_enc_ops[] = {
4334 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
4335 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
4336 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
4337 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
4338 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
4339 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4340 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
4341 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
4342 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
4343 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
4344 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
4345 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
4346 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
4347 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
4348 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4349 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
4350 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
4351 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
4352 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
4353 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
4354 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
4355 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
4356 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
4357 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
4358 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
4359 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
4360 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
4361 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
4362 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
4363 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
4364 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
4365 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
4366 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
4367 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4368 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4369 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
4370 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
4371
4372 /* NFSv4.1 operations */
4373 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
4374 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4375 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
4376 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
4377 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
4378 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
4379 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4380 #ifdef CONFIG_NFSD_PNFS
4381 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4382 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4383 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit,
4384 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget,
4385 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn,
4386 #else
4387 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
4388 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4389 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
4390 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
4391 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4392 #endif
4393 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4394 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
4395 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
4396 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
4397 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4398 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
4399 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
4400
4401 /* NFSv4.2 operations */
4402 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4403 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy,
4404 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
4405 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4406 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
4407 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
4408 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
4409 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
4410 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop,
4411 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
4412 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
4413 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
4414 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop,
4415 };
4416
4417 /*
4418 * Calculate whether we still have space to encode repsize bytes.
4419 * There are two considerations:
4420 * - For NFS versions >=4.1, the size of the reply must stay within
4421 * session limits
4422 * - For all NFS versions, we must stay within limited preallocated
4423 * buffer space.
4424 *
4425 * This is called before the operation is processed, so can only provide
4426 * an upper estimate. For some nonidempotent operations (such as
4427 * getattr), it's not necessarily a problem if that estimate is wrong,
4428 * as we can fail it after processing without significant side effects.
4429 */
4430 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4431 {
4432 struct xdr_buf *buf = &resp->rqstp->rq_res;
4433 struct nfsd4_slot *slot = resp->cstate.slot;
4434
4435 if (buf->len + respsize <= buf->buflen)
4436 return nfs_ok;
4437 if (!nfsd4_has_session(&resp->cstate))
4438 return nfserr_resource;
4439 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4440 WARN_ON_ONCE(1);
4441 return nfserr_rep_too_big_to_cache;
4442 }
4443 return nfserr_rep_too_big;
4444 }
4445
4446 void
4447 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4448 {
4449 struct xdr_stream *xdr = &resp->xdr;
4450 struct nfs4_stateowner *so = resp->cstate.replay_owner;
4451 struct svc_rqst *rqstp = resp->rqstp;
4452 int post_err_offset;
4453 nfsd4_enc encoder;
4454 __be32 *p;
4455
4456 p = xdr_reserve_space(xdr, 8);
4457 if (!p) {
4458 WARN_ON_ONCE(1);
4459 return;
4460 }
4461 *p++ = cpu_to_be32(op->opnum);
4462 post_err_offset = xdr->buf->len;
4463
4464 if (op->opnum == OP_ILLEGAL)
4465 goto status;
4466 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4467 !nfsd4_enc_ops[op->opnum]);
4468 encoder = nfsd4_enc_ops[op->opnum];
4469 op->status = encoder(resp, op->status, &op->u);
4470 xdr_commit_encode(xdr);
4471
4472 /* nfsd4_check_resp_size guarantees enough room for error status */
4473 if (!op->status) {
4474 int space_needed = 0;
4475 if (!nfsd4_last_compound_op(rqstp))
4476 space_needed = COMPOUND_ERR_SLACK_SPACE;
4477 op->status = nfsd4_check_resp_size(resp, space_needed);
4478 }
4479 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4480 struct nfsd4_slot *slot = resp->cstate.slot;
4481
4482 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4483 op->status = nfserr_rep_too_big_to_cache;
4484 else
4485 op->status = nfserr_rep_too_big;
4486 }
4487 if (op->status == nfserr_resource ||
4488 op->status == nfserr_rep_too_big ||
4489 op->status == nfserr_rep_too_big_to_cache) {
4490 /*
4491 * The operation may have already been encoded or
4492 * partially encoded. No op returns anything additional
4493 * in the case of one of these three errors, so we can
4494 * just truncate back to after the status. But it's a
4495 * bug if we had to do this on a non-idempotent op:
4496 */
4497 warn_on_nonidempotent_op(op);
4498 xdr_truncate_encode(xdr, post_err_offset);
4499 }
4500 if (so) {
4501 int len = xdr->buf->len - post_err_offset;
4502
4503 so->so_replay.rp_status = op->status;
4504 so->so_replay.rp_buflen = len;
4505 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4506 so->so_replay.rp_buf, len);
4507 }
4508 status:
4509 /* Note that op->status is already in network byte order: */
4510 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4511 }
4512
4513 /*
4514 * Encode the reply stored in the stateowner reply cache
4515 *
4516 * XDR note: do not encode rp->rp_buflen: the buffer contains the
4517 * previously sent already encoded operation.
4518 */
4519 void
4520 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4521 {
4522 __be32 *p;
4523 struct nfs4_replay *rp = op->replay;
4524
4525 BUG_ON(!rp);
4526
4527 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4528 if (!p) {
4529 WARN_ON_ONCE(1);
4530 return;
4531 }
4532 *p++ = cpu_to_be32(op->opnum);
4533 *p++ = rp->rp_status; /* already xdr'ed */
4534
4535 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4536 }
4537
4538 int
4539 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4540 {
4541 return xdr_ressize_check(rqstp, p);
4542 }
4543
4544 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4545 {
4546 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4547
4548 if (args->ops != args->iops) {
4549 kfree(args->ops);
4550 args->ops = args->iops;
4551 }
4552 kfree(args->tmpp);
4553 args->tmpp = NULL;
4554 while (args->to_free) {
4555 struct svcxdr_tmpbuf *tb = args->to_free;
4556 args->to_free = tb->next;
4557 kfree(tb);
4558 }
4559 }
4560
4561 int
4562 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4563 {
4564 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4565
4566 if (rqstp->rq_arg.head[0].iov_len % 4) {
4567 /* client is nuts */
4568 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4569 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4570 return 0;
4571 }
4572 args->p = p;
4573 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4574 args->pagelist = rqstp->rq_arg.pages;
4575 args->pagelen = rqstp->rq_arg.page_len;
4576 args->tmpp = NULL;
4577 args->to_free = NULL;
4578 args->ops = args->iops;
4579 args->rqstp = rqstp;
4580
4581 return !nfsd4_decode_compound(args);
4582 }
4583
4584 int
4585 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4586 {
4587 /*
4588 * All that remains is to write the tag and operation count...
4589 */
4590 struct nfsd4_compoundres *resp = rqstp->rq_resp;
4591 struct xdr_buf *buf = resp->xdr.buf;
4592
4593 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4594 buf->tail[0].iov_len);
4595
4596 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4597
4598 p = resp->tagp;
4599 *p++ = htonl(resp->taglen);
4600 memcpy(p, resp->tag, resp->taglen);
4601 p += XDR_QUADLEN(resp->taglen);
4602 *p++ = htonl(resp->opcnt);
4603
4604 nfsd4_sequence_done(resp);
4605 return 1;
4606 }
4607
4608 /*
4609 * Local variables:
4610 * c-basic-offset: 8
4611 * End:
4612 */
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