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