]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - fs/nfsd/nfs4xdr.c
projects / mirror_ubuntu-jammy-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'csky-for-linus-5.7-rc1' of git://github.com/c-sky/csky-linux
[mirror_ubuntu-jammy-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/file.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/statfs.h>
40 #include <linux/utsname.h>
41 #include <linux/pagemap.h>
42 #include <linux/sunrpc/svcauth_gss.h>
43 #include <linux/sunrpc/addr.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 #include "filecache.h"
54
55 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
56 #include <linux/security.h>
57 #endif
58
59
60 #define NFSDDBG_FACILITY NFSDDBG_XDR
61
62 const u32 nfsd_suppattrs[3][3] = {
63 {NFSD4_SUPPORTED_ATTRS_WORD0,
64 NFSD4_SUPPORTED_ATTRS_WORD1,
65 NFSD4_SUPPORTED_ATTRS_WORD2},
66
67 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
68 NFSD4_1_SUPPORTED_ATTRS_WORD1,
69 NFSD4_1_SUPPORTED_ATTRS_WORD2},
70
71 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
72 NFSD4_1_SUPPORTED_ATTRS_WORD1,
73 NFSD4_2_SUPPORTED_ATTRS_WORD2},
74 };
75
76 /*
77 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
78 * directory in order to indicate to the client that a filesystem boundary is present
79 * We use a fixed fsid for a referral
80 */
81 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
82 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
83
84 static __be32
85 check_filename(char *str, int len)
86 {
87 int i;
88
89 if (len == 0)
90 return nfserr_inval;
91 if (isdotent(str, len))
92 return nfserr_badname;
93 for (i = 0; i < len; i++)
94 if (str[i] == '/')
95 return nfserr_badname;
96 return 0;
97 }
98
99 #define DECODE_HEAD \
100 __be32 *p; \
101 __be32 status
102 #define DECODE_TAIL \
103 status = 0; \
104 out: \
105 return status; \
106 xdr_error: \
107 dprintk("NFSD: xdr error (%s:%d)\n", \
108 __FILE__, __LINE__); \
109 status = nfserr_bad_xdr; \
110 goto out
111
112 #define READMEM(x,nbytes) do { \
113 x = (char *)p; \
114 p += XDR_QUADLEN(nbytes); \
115 } while (0)
116 #define SAVEMEM(x,nbytes) do { \
117 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
118 savemem(argp, p, nbytes) : \
119 (char *)p)) { \
120 dprintk("NFSD: xdr error (%s:%d)\n", \
121 __FILE__, __LINE__); \
122 goto xdr_error; \
123 } \
124 p += XDR_QUADLEN(nbytes); \
125 } while (0)
126 #define COPYMEM(x,nbytes) do { \
127 memcpy((x), p, nbytes); \
128 p += XDR_QUADLEN(nbytes); \
129 } while (0)
130
131 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
132 #define READ_BUF(nbytes) do { \
133 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
134 p = argp->p; \
135 argp->p += XDR_QUADLEN(nbytes); \
136 } else if (!(p = read_buf(argp, nbytes))) { \
137 dprintk("NFSD: xdr error (%s:%d)\n", \
138 __FILE__, __LINE__); \
139 goto xdr_error; \
140 } \
141 } while (0)
142
143 static void next_decode_page(struct nfsd4_compoundargs *argp)
144 {
145 argp->p = page_address(argp->pagelist[0]);
146 argp->pagelist++;
147 if (argp->pagelen < PAGE_SIZE) {
148 argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
149 argp->pagelen = 0;
150 } else {
151 argp->end = argp->p + (PAGE_SIZE>>2);
152 argp->pagelen -= PAGE_SIZE;
153 }
154 }
155
156 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
157 {
158 /* We want more bytes than seem to be available.
159 * Maybe we need a new page, maybe we have just run out
160 */
161 unsigned int avail = (char *)argp->end - (char *)argp->p;
162 __be32 *p;
163
164 if (argp->pagelen == 0) {
165 struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
166
167 if (!argp->tail) {
168 argp->tail = true;
169 avail = vec->iov_len;
170 argp->p = vec->iov_base;
171 argp->end = vec->iov_base + avail;
172 }
173
174 if (avail < nbytes)
175 return NULL;
176
177 p = argp->p;
178 argp->p += XDR_QUADLEN(nbytes);
179 return p;
180 }
181
182 if (avail + argp->pagelen < nbytes)
183 return NULL;
184 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
185 return NULL;
186 /* ok, we can do it with the current plus the next page */
187 if (nbytes <= sizeof(argp->tmp))
188 p = argp->tmp;
189 else {
190 kfree(argp->tmpp);
191 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
192 if (!p)
193 return NULL;
194
195 }
196 /*
197 * The following memcpy is safe because read_buf is always
198 * called with nbytes > avail, and the two cases above both
199 * guarantee p points to at least nbytes bytes.
200 */
201 memcpy(p, argp->p, avail);
202 next_decode_page(argp);
203 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
204 argp->p += XDR_QUADLEN(nbytes - avail);
205 return p;
206 }
207
208 static unsigned int compoundargs_bytes_left(struct nfsd4_compoundargs *argp)
209 {
210 unsigned int this = (char *)argp->end - (char *)argp->p;
211
212 return this + argp->pagelen;
213 }
214
215 static int zero_clientid(clientid_t *clid)
216 {
217 return (clid->cl_boot == 0) && (clid->cl_id == 0);
218 }
219
220 /**
221 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
222 * @argp: NFSv4 compound argument structure
223 * @len: length of buffer to allocate
224 *
225 * Allocates a buffer of size @len to be freed when processing the compound
226 * operation described in @argp finishes.
227 */
228 static void *
229 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
230 {
231 struct svcxdr_tmpbuf *tb;
232
233 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
234 if (!tb)
235 return NULL;
236 tb->next = argp->to_free;
237 argp->to_free = tb;
238 return tb->buf;
239 }
240
241 /*
242 * For xdr strings that need to be passed to other kernel api's
243 * as null-terminated strings.
244 *
245 * Note null-terminating in place usually isn't safe since the
246 * buffer might end on a page boundary.
247 */
248 static char *
249 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
250 {
251 char *p = svcxdr_tmpalloc(argp, len + 1);
252
253 if (!p)
254 return NULL;
255 memcpy(p, buf, len);
256 p[len] = '\0';
257 return p;
258 }
259
260 /**
261 * savemem - duplicate a chunk of memory for later processing
262 * @argp: NFSv4 compound argument structure to be freed with
263 * @p: pointer to be duplicated
264 * @nbytes: length to be duplicated
265 *
266 * Returns a pointer to a copy of @nbytes bytes of memory at @p
267 * that are preserved until processing of the NFSv4 compound
268 * operation described by @argp finishes.
269 */
270 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
271 {
272 void *ret;
273
274 ret = svcxdr_tmpalloc(argp, nbytes);
275 if (!ret)
276 return NULL;
277 memcpy(ret, p, nbytes);
278 return ret;
279 }
280
281 static __be32
282 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
283 {
284 DECODE_HEAD;
285
286 READ_BUF(12);
287 p = xdr_decode_hyper(p, &tv->tv_sec);
288 tv->tv_nsec = be32_to_cpup(p++);
289 if (tv->tv_nsec >= (u32)1000000000)
290 return nfserr_inval;
291
292 DECODE_TAIL;
293 }
294
295 static __be32
296 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
297 {
298 u32 bmlen;
299 DECODE_HEAD;
300
301 bmval[0] = 0;
302 bmval[1] = 0;
303 bmval[2] = 0;
304
305 READ_BUF(4);
306 bmlen = be32_to_cpup(p++);
307 if (bmlen > 1000)
308 goto xdr_error;
309
310 READ_BUF(bmlen << 2);
311 if (bmlen > 0)
312 bmval[0] = be32_to_cpup(p++);
313 if (bmlen > 1)
314 bmval[1] = be32_to_cpup(p++);
315 if (bmlen > 2)
316 bmval[2] = be32_to_cpup(p++);
317
318 DECODE_TAIL;
319 }
320
321 static __be32
322 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
323 struct iattr *iattr, struct nfs4_acl **acl,
324 struct xdr_netobj *label, int *umask)
325 {
326 int expected_len, len = 0;
327 u32 dummy32;
328 char *buf;
329
330 DECODE_HEAD;
331 iattr->ia_valid = 0;
332 if ((status = nfsd4_decode_bitmap(argp, bmval)))
333 return status;
334
335 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
336 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
337 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
338 if (nfsd_attrs_supported(argp->minorversion, bmval))
339 return nfserr_inval;
340 return nfserr_attrnotsupp;
341 }
342
343 READ_BUF(4);
344 expected_len = be32_to_cpup(p++);
345
346 if (bmval[0] & FATTR4_WORD0_SIZE) {
347 READ_BUF(8);
348 len += 8;
349 p = xdr_decode_hyper(p, &iattr->ia_size);
350 iattr->ia_valid |= ATTR_SIZE;
351 }
352 if (bmval[0] & FATTR4_WORD0_ACL) {
353 u32 nace;
354 struct nfs4_ace *ace;
355
356 READ_BUF(4); len += 4;
357 nace = be32_to_cpup(p++);
358
359 if (nace > compoundargs_bytes_left(argp)/20)
360 /*
361 * Even with 4-byte names there wouldn't be
362 * space for that many aces; something fishy is
363 * going on:
364 */
365 return nfserr_fbig;
366
367 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
368 if (*acl == NULL)
369 return nfserr_jukebox;
370
371 (*acl)->naces = nace;
372 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
373 READ_BUF(16); len += 16;
374 ace->type = be32_to_cpup(p++);
375 ace->flag = be32_to_cpup(p++);
376 ace->access_mask = be32_to_cpup(p++);
377 dummy32 = be32_to_cpup(p++);
378 READ_BUF(dummy32);
379 len += XDR_QUADLEN(dummy32) << 2;
380 READMEM(buf, dummy32);
381 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
382 status = nfs_ok;
383 if (ace->whotype != NFS4_ACL_WHO_NAMED)
384 ;
385 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
386 status = nfsd_map_name_to_gid(argp->rqstp,
387 buf, dummy32, &ace->who_gid);
388 else
389 status = nfsd_map_name_to_uid(argp->rqstp,
390 buf, dummy32, &ace->who_uid);
391 if (status)
392 return status;
393 }
394 } else
395 *acl = NULL;
396 if (bmval[1] & FATTR4_WORD1_MODE) {
397 READ_BUF(4);
398 len += 4;
399 iattr->ia_mode = be32_to_cpup(p++);
400 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
401 iattr->ia_valid |= ATTR_MODE;
402 }
403 if (bmval[1] & FATTR4_WORD1_OWNER) {
404 READ_BUF(4);
405 len += 4;
406 dummy32 = be32_to_cpup(p++);
407 READ_BUF(dummy32);
408 len += (XDR_QUADLEN(dummy32) << 2);
409 READMEM(buf, dummy32);
410 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
411 return status;
412 iattr->ia_valid |= ATTR_UID;
413 }
414 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
415 READ_BUF(4);
416 len += 4;
417 dummy32 = be32_to_cpup(p++);
418 READ_BUF(dummy32);
419 len += (XDR_QUADLEN(dummy32) << 2);
420 READMEM(buf, dummy32);
421 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
422 return status;
423 iattr->ia_valid |= ATTR_GID;
424 }
425 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
426 READ_BUF(4);
427 len += 4;
428 dummy32 = be32_to_cpup(p++);
429 switch (dummy32) {
430 case NFS4_SET_TO_CLIENT_TIME:
431 len += 12;
432 status = nfsd4_decode_time(argp, &iattr->ia_atime);
433 if (status)
434 return status;
435 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
436 break;
437 case NFS4_SET_TO_SERVER_TIME:
438 iattr->ia_valid |= ATTR_ATIME;
439 break;
440 default:
441 goto xdr_error;
442 }
443 }
444 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
445 READ_BUF(4);
446 len += 4;
447 dummy32 = be32_to_cpup(p++);
448 switch (dummy32) {
449 case NFS4_SET_TO_CLIENT_TIME:
450 len += 12;
451 status = nfsd4_decode_time(argp, &iattr->ia_mtime);
452 if (status)
453 return status;
454 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
455 break;
456 case NFS4_SET_TO_SERVER_TIME:
457 iattr->ia_valid |= ATTR_MTIME;
458 break;
459 default:
460 goto xdr_error;
461 }
462 }
463
464 label->len = 0;
465 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
466 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
467 READ_BUF(4);
468 len += 4;
469 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
470 READ_BUF(4);
471 len += 4;
472 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
473 READ_BUF(4);
474 len += 4;
475 dummy32 = be32_to_cpup(p++);
476 READ_BUF(dummy32);
477 if (dummy32 > NFS4_MAXLABELLEN)
478 return nfserr_badlabel;
479 len += (XDR_QUADLEN(dummy32) << 2);
480 READMEM(buf, dummy32);
481 label->len = dummy32;
482 label->data = svcxdr_dupstr(argp, buf, dummy32);
483 if (!label->data)
484 return nfserr_jukebox;
485 }
486 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
487 if (!umask)
488 goto xdr_error;
489 READ_BUF(8);
490 len += 8;
491 dummy32 = be32_to_cpup(p++);
492 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
493 dummy32 = be32_to_cpup(p++);
494 *umask = dummy32 & S_IRWXUGO;
495 iattr->ia_valid |= ATTR_MODE;
496 }
497 if (len != expected_len)
498 goto xdr_error;
499
500 DECODE_TAIL;
501 }
502
503 static __be32
504 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
505 {
506 DECODE_HEAD;
507
508 READ_BUF(sizeof(stateid_t));
509 sid->si_generation = be32_to_cpup(p++);
510 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
511
512 DECODE_TAIL;
513 }
514
515 static __be32
516 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
517 {
518 DECODE_HEAD;
519
520 READ_BUF(4);
521 access->ac_req_access = be32_to_cpup(p++);
522
523 DECODE_TAIL;
524 }
525
526 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
527 {
528 DECODE_HEAD;
529 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
530 u32 dummy, uid, gid;
531 char *machine_name;
532 int i;
533 int nr_secflavs;
534
535 /* callback_sec_params4 */
536 READ_BUF(4);
537 nr_secflavs = be32_to_cpup(p++);
538 if (nr_secflavs)
539 cbs->flavor = (u32)(-1);
540 else
541 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
542 cbs->flavor = 0;
543 for (i = 0; i < nr_secflavs; ++i) {
544 READ_BUF(4);
545 dummy = be32_to_cpup(p++);
546 switch (dummy) {
547 case RPC_AUTH_NULL:
548 /* Nothing to read */
549 if (cbs->flavor == (u32)(-1))
550 cbs->flavor = RPC_AUTH_NULL;
551 break;
552 case RPC_AUTH_UNIX:
553 READ_BUF(8);
554 /* stamp */
555 dummy = be32_to_cpup(p++);
556
557 /* machine name */
558 dummy = be32_to_cpup(p++);
559 READ_BUF(dummy);
560 SAVEMEM(machine_name, dummy);
561
562 /* uid, gid */
563 READ_BUF(8);
564 uid = be32_to_cpup(p++);
565 gid = be32_to_cpup(p++);
566
567 /* more gids */
568 READ_BUF(4);
569 dummy = be32_to_cpup(p++);
570 READ_BUF(dummy * 4);
571 if (cbs->flavor == (u32)(-1)) {
572 kuid_t kuid = make_kuid(userns, uid);
573 kgid_t kgid = make_kgid(userns, gid);
574 if (uid_valid(kuid) && gid_valid(kgid)) {
575 cbs->uid = kuid;
576 cbs->gid = kgid;
577 cbs->flavor = RPC_AUTH_UNIX;
578 } else {
579 dprintk("RPC_AUTH_UNIX with invalid"
580 "uid or gid ignoring!\n");
581 }
582 }
583 break;
584 case RPC_AUTH_GSS:
585 dprintk("RPC_AUTH_GSS callback secflavor "
586 "not supported!\n");
587 READ_BUF(8);
588 /* gcbp_service */
589 dummy = be32_to_cpup(p++);
590 /* gcbp_handle_from_server */
591 dummy = be32_to_cpup(p++);
592 READ_BUF(dummy);
593 p += XDR_QUADLEN(dummy);
594 /* gcbp_handle_from_client */
595 READ_BUF(4);
596 dummy = be32_to_cpup(p++);
597 READ_BUF(dummy);
598 break;
599 default:
600 dprintk("Illegal callback secflavor\n");
601 return nfserr_inval;
602 }
603 }
604 DECODE_TAIL;
605 }
606
607 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
608 {
609 DECODE_HEAD;
610
611 READ_BUF(4);
612 bc->bc_cb_program = be32_to_cpup(p++);
613 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
614
615 DECODE_TAIL;
616 }
617
618 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
619 {
620 DECODE_HEAD;
621
622 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
623 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
624 bcts->dir = be32_to_cpup(p++);
625 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
626 * could help us figure out we should be using it. */
627 DECODE_TAIL;
628 }
629
630 static __be32
631 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
632 {
633 DECODE_HEAD;
634
635 READ_BUF(4);
636 close->cl_seqid = be32_to_cpup(p++);
637 return nfsd4_decode_stateid(argp, &close->cl_stateid);
638
639 DECODE_TAIL;
640 }
641
642
643 static __be32
644 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
645 {
646 DECODE_HEAD;
647
648 READ_BUF(12);
649 p = xdr_decode_hyper(p, &commit->co_offset);
650 commit->co_count = be32_to_cpup(p++);
651
652 DECODE_TAIL;
653 }
654
655 static __be32
656 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
657 {
658 DECODE_HEAD;
659
660 READ_BUF(4);
661 create->cr_type = be32_to_cpup(p++);
662 switch (create->cr_type) {
663 case NF4LNK:
664 READ_BUF(4);
665 create->cr_datalen = be32_to_cpup(p++);
666 READ_BUF(create->cr_datalen);
667 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
668 if (!create->cr_data)
669 return nfserr_jukebox;
670 break;
671 case NF4BLK:
672 case NF4CHR:
673 READ_BUF(8);
674 create->cr_specdata1 = be32_to_cpup(p++);
675 create->cr_specdata2 = be32_to_cpup(p++);
676 break;
677 case NF4SOCK:
678 case NF4FIFO:
679 case NF4DIR:
680 default:
681 break;
682 }
683
684 READ_BUF(4);
685 create->cr_namelen = be32_to_cpup(p++);
686 READ_BUF(create->cr_namelen);
687 SAVEMEM(create->cr_name, create->cr_namelen);
688 if ((status = check_filename(create->cr_name, create->cr_namelen)))
689 return status;
690
691 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
692 &create->cr_acl, &create->cr_label,
693 &create->cr_umask);
694 if (status)
695 goto out;
696
697 DECODE_TAIL;
698 }
699
700 static inline __be32
701 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
702 {
703 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
704 }
705
706 static inline __be32
707 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
708 {
709 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
710 }
711
712 static __be32
713 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
714 {
715 DECODE_HEAD;
716
717 READ_BUF(4);
718 link->li_namelen = be32_to_cpup(p++);
719 READ_BUF(link->li_namelen);
720 SAVEMEM(link->li_name, link->li_namelen);
721 if ((status = check_filename(link->li_name, link->li_namelen)))
722 return status;
723
724 DECODE_TAIL;
725 }
726
727 static __be32
728 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
729 {
730 DECODE_HEAD;
731
732 /*
733 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
734 */
735 READ_BUF(28);
736 lock->lk_type = be32_to_cpup(p++);
737 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
738 goto xdr_error;
739 lock->lk_reclaim = be32_to_cpup(p++);
740 p = xdr_decode_hyper(p, &lock->lk_offset);
741 p = xdr_decode_hyper(p, &lock->lk_length);
742 lock->lk_is_new = be32_to_cpup(p++);
743
744 if (lock->lk_is_new) {
745 READ_BUF(4);
746 lock->lk_new_open_seqid = be32_to_cpup(p++);
747 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
748 if (status)
749 return status;
750 READ_BUF(8 + sizeof(clientid_t));
751 lock->lk_new_lock_seqid = be32_to_cpup(p++);
752 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
753 lock->lk_new_owner.len = be32_to_cpup(p++);
754 READ_BUF(lock->lk_new_owner.len);
755 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
756 } else {
757 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
758 if (status)
759 return status;
760 READ_BUF(4);
761 lock->lk_old_lock_seqid = be32_to_cpup(p++);
762 }
763
764 DECODE_TAIL;
765 }
766
767 static __be32
768 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
769 {
770 DECODE_HEAD;
771
772 READ_BUF(32);
773 lockt->lt_type = be32_to_cpup(p++);
774 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
775 goto xdr_error;
776 p = xdr_decode_hyper(p, &lockt->lt_offset);
777 p = xdr_decode_hyper(p, &lockt->lt_length);
778 COPYMEM(&lockt->lt_clientid, 8);
779 lockt->lt_owner.len = be32_to_cpup(p++);
780 READ_BUF(lockt->lt_owner.len);
781 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
782
783 DECODE_TAIL;
784 }
785
786 static __be32
787 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
788 {
789 DECODE_HEAD;
790
791 READ_BUF(8);
792 locku->lu_type = be32_to_cpup(p++);
793 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
794 goto xdr_error;
795 locku->lu_seqid = be32_to_cpup(p++);
796 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
797 if (status)
798 return status;
799 READ_BUF(16);
800 p = xdr_decode_hyper(p, &locku->lu_offset);
801 p = xdr_decode_hyper(p, &locku->lu_length);
802
803 DECODE_TAIL;
804 }
805
806 static __be32
807 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
808 {
809 DECODE_HEAD;
810
811 READ_BUF(4);
812 lookup->lo_len = be32_to_cpup(p++);
813 READ_BUF(lookup->lo_len);
814 SAVEMEM(lookup->lo_name, lookup->lo_len);
815 if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
816 return status;
817
818 DECODE_TAIL;
819 }
820
821 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
822 {
823 __be32 *p;
824 u32 w;
825
826 READ_BUF(4);
827 w = be32_to_cpup(p++);
828 *share_access = w & NFS4_SHARE_ACCESS_MASK;
829 *deleg_want = w & NFS4_SHARE_WANT_MASK;
830 if (deleg_when)
831 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
832
833 switch (w & NFS4_SHARE_ACCESS_MASK) {
834 case NFS4_SHARE_ACCESS_READ:
835 case NFS4_SHARE_ACCESS_WRITE:
836 case NFS4_SHARE_ACCESS_BOTH:
837 break;
838 default:
839 return nfserr_bad_xdr;
840 }
841 w &= ~NFS4_SHARE_ACCESS_MASK;
842 if (!w)
843 return nfs_ok;
844 if (!argp->minorversion)
845 return nfserr_bad_xdr;
846 switch (w & NFS4_SHARE_WANT_MASK) {
847 case NFS4_SHARE_WANT_NO_PREFERENCE:
848 case NFS4_SHARE_WANT_READ_DELEG:
849 case NFS4_SHARE_WANT_WRITE_DELEG:
850 case NFS4_SHARE_WANT_ANY_DELEG:
851 case NFS4_SHARE_WANT_NO_DELEG:
852 case NFS4_SHARE_WANT_CANCEL:
853 break;
854 default:
855 return nfserr_bad_xdr;
856 }
857 w &= ~NFS4_SHARE_WANT_MASK;
858 if (!w)
859 return nfs_ok;
860
861 if (!deleg_when) /* open_downgrade */
862 return nfserr_inval;
863 switch (w) {
864 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
865 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
866 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
867 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
868 return nfs_ok;
869 }
870 xdr_error:
871 return nfserr_bad_xdr;
872 }
873
874 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
875 {
876 __be32 *p;
877
878 READ_BUF(4);
879 *x = be32_to_cpup(p++);
880 /* Note: unlinke access bits, deny bits may be zero. */
881 if (*x & ~NFS4_SHARE_DENY_BOTH)
882 return nfserr_bad_xdr;
883 return nfs_ok;
884 xdr_error:
885 return nfserr_bad_xdr;
886 }
887
888 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
889 {
890 __be32 *p;
891
892 READ_BUF(4);
893 o->len = be32_to_cpup(p++);
894
895 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
896 return nfserr_bad_xdr;
897
898 READ_BUF(o->len);
899 SAVEMEM(o->data, o->len);
900 return nfs_ok;
901 xdr_error:
902 return nfserr_bad_xdr;
903 }
904
905 static __be32
906 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
907 {
908 DECODE_HEAD;
909 u32 dummy;
910
911 memset(open->op_bmval, 0, sizeof(open->op_bmval));
912 open->op_iattr.ia_valid = 0;
913 open->op_openowner = NULL;
914
915 open->op_xdr_error = 0;
916 /* seqid, share_access, share_deny, clientid, ownerlen */
917 READ_BUF(4);
918 open->op_seqid = be32_to_cpup(p++);
919 /* decode, yet ignore deleg_when until supported */
920 status = nfsd4_decode_share_access(argp, &open->op_share_access,
921 &open->op_deleg_want, &dummy);
922 if (status)
923 goto xdr_error;
924 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
925 if (status)
926 goto xdr_error;
927 READ_BUF(sizeof(clientid_t));
928 COPYMEM(&open->op_clientid, sizeof(clientid_t));
929 status = nfsd4_decode_opaque(argp, &open->op_owner);
930 if (status)
931 goto xdr_error;
932 READ_BUF(4);
933 open->op_create = be32_to_cpup(p++);
934 switch (open->op_create) {
935 case NFS4_OPEN_NOCREATE:
936 break;
937 case NFS4_OPEN_CREATE:
938 READ_BUF(4);
939 open->op_createmode = be32_to_cpup(p++);
940 switch (open->op_createmode) {
941 case NFS4_CREATE_UNCHECKED:
942 case NFS4_CREATE_GUARDED:
943 status = nfsd4_decode_fattr(argp, open->op_bmval,
944 &open->op_iattr, &open->op_acl, &open->op_label,
945 &open->op_umask);
946 if (status)
947 goto out;
948 break;
949 case NFS4_CREATE_EXCLUSIVE:
950 READ_BUF(NFS4_VERIFIER_SIZE);
951 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
952 break;
953 case NFS4_CREATE_EXCLUSIVE4_1:
954 if (argp->minorversion < 1)
955 goto xdr_error;
956 READ_BUF(NFS4_VERIFIER_SIZE);
957 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
958 status = nfsd4_decode_fattr(argp, open->op_bmval,
959 &open->op_iattr, &open->op_acl, &open->op_label,
960 &open->op_umask);
961 if (status)
962 goto out;
963 break;
964 default:
965 goto xdr_error;
966 }
967 break;
968 default:
969 goto xdr_error;
970 }
971
972 /* open_claim */
973 READ_BUF(4);
974 open->op_claim_type = be32_to_cpup(p++);
975 switch (open->op_claim_type) {
976 case NFS4_OPEN_CLAIM_NULL:
977 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
978 READ_BUF(4);
979 open->op_fname.len = be32_to_cpup(p++);
980 READ_BUF(open->op_fname.len);
981 SAVEMEM(open->op_fname.data, open->op_fname.len);
982 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
983 return status;
984 break;
985 case NFS4_OPEN_CLAIM_PREVIOUS:
986 READ_BUF(4);
987 open->op_delegate_type = be32_to_cpup(p++);
988 break;
989 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
990 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
991 if (status)
992 return status;
993 READ_BUF(4);
994 open->op_fname.len = be32_to_cpup(p++);
995 READ_BUF(open->op_fname.len);
996 SAVEMEM(open->op_fname.data, open->op_fname.len);
997 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
998 return status;
999 break;
1000 case NFS4_OPEN_CLAIM_FH:
1001 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1002 if (argp->minorversion < 1)
1003 goto xdr_error;
1004 /* void */
1005 break;
1006 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1007 if (argp->minorversion < 1)
1008 goto xdr_error;
1009 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1010 if (status)
1011 return status;
1012 break;
1013 default:
1014 goto xdr_error;
1015 }
1016
1017 DECODE_TAIL;
1018 }
1019
1020 static __be32
1021 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1022 {
1023 DECODE_HEAD;
1024
1025 if (argp->minorversion >= 1)
1026 return nfserr_notsupp;
1027
1028 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1029 if (status)
1030 return status;
1031 READ_BUF(4);
1032 open_conf->oc_seqid = be32_to_cpup(p++);
1033
1034 DECODE_TAIL;
1035 }
1036
1037 static __be32
1038 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1039 {
1040 DECODE_HEAD;
1041
1042 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1043 if (status)
1044 return status;
1045 READ_BUF(4);
1046 open_down->od_seqid = be32_to_cpup(p++);
1047 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1048 &open_down->od_deleg_want, NULL);
1049 if (status)
1050 return status;
1051 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1052 if (status)
1053 return status;
1054 DECODE_TAIL;
1055 }
1056
1057 static __be32
1058 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1059 {
1060 DECODE_HEAD;
1061
1062 READ_BUF(4);
1063 putfh->pf_fhlen = be32_to_cpup(p++);
1064 if (putfh->pf_fhlen > NFS4_FHSIZE)
1065 goto xdr_error;
1066 READ_BUF(putfh->pf_fhlen);
1067 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1068
1069 DECODE_TAIL;
1070 }
1071
1072 static __be32
1073 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1074 {
1075 if (argp->minorversion == 0)
1076 return nfs_ok;
1077 return nfserr_notsupp;
1078 }
1079
1080 static __be32
1081 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1082 {
1083 DECODE_HEAD;
1084
1085 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1086 if (status)
1087 return status;
1088 READ_BUF(12);
1089 p = xdr_decode_hyper(p, &read->rd_offset);
1090 read->rd_length = be32_to_cpup(p++);
1091
1092 DECODE_TAIL;
1093 }
1094
1095 static __be32
1096 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1097 {
1098 DECODE_HEAD;
1099
1100 READ_BUF(24);
1101 p = xdr_decode_hyper(p, &readdir->rd_cookie);
1102 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1103 readdir->rd_dircount = be32_to_cpup(p++);
1104 readdir->rd_maxcount = be32_to_cpup(p++);
1105 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1106 goto out;
1107
1108 DECODE_TAIL;
1109 }
1110
1111 static __be32
1112 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1113 {
1114 DECODE_HEAD;
1115
1116 READ_BUF(4);
1117 remove->rm_namelen = be32_to_cpup(p++);
1118 READ_BUF(remove->rm_namelen);
1119 SAVEMEM(remove->rm_name, remove->rm_namelen);
1120 if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1121 return status;
1122
1123 DECODE_TAIL;
1124 }
1125
1126 static __be32
1127 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1128 {
1129 DECODE_HEAD;
1130
1131 READ_BUF(4);
1132 rename->rn_snamelen = be32_to_cpup(p++);
1133 READ_BUF(rename->rn_snamelen);
1134 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1135 READ_BUF(4);
1136 rename->rn_tnamelen = be32_to_cpup(p++);
1137 READ_BUF(rename->rn_tnamelen);
1138 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1139 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1140 return status;
1141 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1142 return status;
1143
1144 DECODE_TAIL;
1145 }
1146
1147 static __be32
1148 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1149 {
1150 DECODE_HEAD;
1151
1152 if (argp->minorversion >= 1)
1153 return nfserr_notsupp;
1154
1155 READ_BUF(sizeof(clientid_t));
1156 COPYMEM(clientid, sizeof(clientid_t));
1157
1158 DECODE_TAIL;
1159 }
1160
1161 static __be32
1162 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1163 struct nfsd4_secinfo *secinfo)
1164 {
1165 DECODE_HEAD;
1166
1167 READ_BUF(4);
1168 secinfo->si_namelen = be32_to_cpup(p++);
1169 READ_BUF(secinfo->si_namelen);
1170 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1171 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1172 if (status)
1173 return status;
1174 DECODE_TAIL;
1175 }
1176
1177 static __be32
1178 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1179 struct nfsd4_secinfo_no_name *sin)
1180 {
1181 DECODE_HEAD;
1182
1183 READ_BUF(4);
1184 sin->sin_style = be32_to_cpup(p++);
1185 DECODE_TAIL;
1186 }
1187
1188 static __be32
1189 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1190 {
1191 __be32 status;
1192
1193 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1194 if (status)
1195 return status;
1196 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1197 &setattr->sa_acl, &setattr->sa_label, NULL);
1198 }
1199
1200 static __be32
1201 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1202 {
1203 DECODE_HEAD;
1204
1205 if (argp->minorversion >= 1)
1206 return nfserr_notsupp;
1207
1208 READ_BUF(NFS4_VERIFIER_SIZE);
1209 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1210
1211 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1212 if (status)
1213 return nfserr_bad_xdr;
1214 READ_BUF(8);
1215 setclientid->se_callback_prog = be32_to_cpup(p++);
1216 setclientid->se_callback_netid_len = be32_to_cpup(p++);
1217 READ_BUF(setclientid->se_callback_netid_len);
1218 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1219 READ_BUF(4);
1220 setclientid->se_callback_addr_len = be32_to_cpup(p++);
1221
1222 READ_BUF(setclientid->se_callback_addr_len);
1223 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1224 READ_BUF(4);
1225 setclientid->se_callback_ident = be32_to_cpup(p++);
1226
1227 DECODE_TAIL;
1228 }
1229
1230 static __be32
1231 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1232 {
1233 DECODE_HEAD;
1234
1235 if (argp->minorversion >= 1)
1236 return nfserr_notsupp;
1237
1238 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1239 COPYMEM(&scd_c->sc_clientid, 8);
1240 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1241
1242 DECODE_TAIL;
1243 }
1244
1245 /* Also used for NVERIFY */
1246 static __be32
1247 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1248 {
1249 DECODE_HEAD;
1250
1251 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1252 goto out;
1253
1254 /* For convenience's sake, we compare raw xdr'd attributes in
1255 * nfsd4_proc_verify */
1256
1257 READ_BUF(4);
1258 verify->ve_attrlen = be32_to_cpup(p++);
1259 READ_BUF(verify->ve_attrlen);
1260 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1261
1262 DECODE_TAIL;
1263 }
1264
1265 static __be32
1266 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1267 {
1268 int avail;
1269 int len;
1270 DECODE_HEAD;
1271
1272 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1273 if (status)
1274 return status;
1275 READ_BUF(16);
1276 p = xdr_decode_hyper(p, &write->wr_offset);
1277 write->wr_stable_how = be32_to_cpup(p++);
1278 if (write->wr_stable_how > NFS_FILE_SYNC)
1279 goto xdr_error;
1280 write->wr_buflen = be32_to_cpup(p++);
1281
1282 /* Sorry .. no magic macros for this.. *
1283 * READ_BUF(write->wr_buflen);
1284 * SAVEMEM(write->wr_buf, write->wr_buflen);
1285 */
1286 avail = (char*)argp->end - (char*)argp->p;
1287 if (avail + argp->pagelen < write->wr_buflen) {
1288 dprintk("NFSD: xdr error (%s:%d)\n",
1289 __FILE__, __LINE__);
1290 goto xdr_error;
1291 }
1292 write->wr_head.iov_base = p;
1293 write->wr_head.iov_len = avail;
1294 write->wr_pagelist = argp->pagelist;
1295
1296 len = XDR_QUADLEN(write->wr_buflen) << 2;
1297 if (len >= avail) {
1298 int pages;
1299
1300 len -= avail;
1301
1302 pages = len >> PAGE_SHIFT;
1303 argp->pagelist += pages;
1304 argp->pagelen -= pages * PAGE_SIZE;
1305 len -= pages * PAGE_SIZE;
1306
1307 next_decode_page(argp);
1308 }
1309 argp->p += XDR_QUADLEN(len);
1310
1311 DECODE_TAIL;
1312 }
1313
1314 static __be32
1315 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1316 {
1317 DECODE_HEAD;
1318
1319 if (argp->minorversion >= 1)
1320 return nfserr_notsupp;
1321
1322 READ_BUF(12);
1323 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1324 rlockowner->rl_owner.len = be32_to_cpup(p++);
1325 READ_BUF(rlockowner->rl_owner.len);
1326 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1327
1328 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1329 return nfserr_inval;
1330 DECODE_TAIL;
1331 }
1332
1333 static __be32
1334 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1335 struct nfsd4_exchange_id *exid)
1336 {
1337 int dummy, tmp;
1338 DECODE_HEAD;
1339
1340 READ_BUF(NFS4_VERIFIER_SIZE);
1341 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1342
1343 status = nfsd4_decode_opaque(argp, &exid->clname);
1344 if (status)
1345 return nfserr_bad_xdr;
1346
1347 READ_BUF(4);
1348 exid->flags = be32_to_cpup(p++);
1349
1350 /* Ignore state_protect4_a */
1351 READ_BUF(4);
1352 exid->spa_how = be32_to_cpup(p++);
1353 switch (exid->spa_how) {
1354 case SP4_NONE:
1355 break;
1356 case SP4_MACH_CRED:
1357 /* spo_must_enforce */
1358 status = nfsd4_decode_bitmap(argp,
1359 exid->spo_must_enforce);
1360 if (status)
1361 goto out;
1362 /* spo_must_allow */
1363 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1364 if (status)
1365 goto out;
1366 break;
1367 case SP4_SSV:
1368 /* ssp_ops */
1369 READ_BUF(4);
1370 dummy = be32_to_cpup(p++);
1371 READ_BUF(dummy * 4);
1372 p += dummy;
1373
1374 READ_BUF(4);
1375 dummy = be32_to_cpup(p++);
1376 READ_BUF(dummy * 4);
1377 p += dummy;
1378
1379 /* ssp_hash_algs<> */
1380 READ_BUF(4);
1381 tmp = be32_to_cpup(p++);
1382 while (tmp--) {
1383 READ_BUF(4);
1384 dummy = be32_to_cpup(p++);
1385 READ_BUF(dummy);
1386 p += XDR_QUADLEN(dummy);
1387 }
1388
1389 /* ssp_encr_algs<> */
1390 READ_BUF(4);
1391 tmp = be32_to_cpup(p++);
1392 while (tmp--) {
1393 READ_BUF(4);
1394 dummy = be32_to_cpup(p++);
1395 READ_BUF(dummy);
1396 p += XDR_QUADLEN(dummy);
1397 }
1398
1399 /* ignore ssp_window and ssp_num_gss_handles: */
1400 READ_BUF(8);
1401 break;
1402 default:
1403 goto xdr_error;
1404 }
1405
1406 READ_BUF(4); /* nfs_impl_id4 array length */
1407 dummy = be32_to_cpup(p++);
1408
1409 if (dummy > 1)
1410 goto xdr_error;
1411
1412 if (dummy == 1) {
1413 status = nfsd4_decode_opaque(argp, &exid->nii_domain);
1414 if (status)
1415 goto xdr_error;
1416
1417 /* nii_name */
1418 status = nfsd4_decode_opaque(argp, &exid->nii_name);
1419 if (status)
1420 goto xdr_error;
1421
1422 /* nii_date */
1423 status = nfsd4_decode_time(argp, &exid->nii_time);
1424 if (status)
1425 goto xdr_error;
1426 }
1427 DECODE_TAIL;
1428 }
1429
1430 static __be32
1431 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1432 struct nfsd4_create_session *sess)
1433 {
1434 DECODE_HEAD;
1435
1436 READ_BUF(16);
1437 COPYMEM(&sess->clientid, 8);
1438 sess->seqid = be32_to_cpup(p++);
1439 sess->flags = be32_to_cpup(p++);
1440
1441 /* Fore channel attrs */
1442 READ_BUF(28);
1443 p++; /* headerpadsz is always 0 */
1444 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1445 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1446 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1447 sess->fore_channel.maxops = be32_to_cpup(p++);
1448 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1449 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1450 if (sess->fore_channel.nr_rdma_attrs == 1) {
1451 READ_BUF(4);
1452 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1453 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1454 dprintk("Too many fore channel attr bitmaps!\n");
1455 goto xdr_error;
1456 }
1457
1458 /* Back channel attrs */
1459 READ_BUF(28);
1460 p++; /* headerpadsz is always 0 */
1461 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1462 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1463 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1464 sess->back_channel.maxops = be32_to_cpup(p++);
1465 sess->back_channel.maxreqs = be32_to_cpup(p++);
1466 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1467 if (sess->back_channel.nr_rdma_attrs == 1) {
1468 READ_BUF(4);
1469 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1470 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1471 dprintk("Too many back channel attr bitmaps!\n");
1472 goto xdr_error;
1473 }
1474
1475 READ_BUF(4);
1476 sess->callback_prog = be32_to_cpup(p++);
1477 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1478 DECODE_TAIL;
1479 }
1480
1481 static __be32
1482 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1483 struct nfsd4_destroy_session *destroy_session)
1484 {
1485 DECODE_HEAD;
1486 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1487 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1488
1489 DECODE_TAIL;
1490 }
1491
1492 static __be32
1493 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1494 struct nfsd4_free_stateid *free_stateid)
1495 {
1496 DECODE_HEAD;
1497
1498 READ_BUF(sizeof(stateid_t));
1499 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1500 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1501
1502 DECODE_TAIL;
1503 }
1504
1505 static __be32
1506 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1507 struct nfsd4_sequence *seq)
1508 {
1509 DECODE_HEAD;
1510
1511 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1512 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1513 seq->seqid = be32_to_cpup(p++);
1514 seq->slotid = be32_to_cpup(p++);
1515 seq->maxslots = be32_to_cpup(p++);
1516 seq->cachethis = be32_to_cpup(p++);
1517
1518 DECODE_TAIL;
1519 }
1520
1521 static __be32
1522 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1523 {
1524 int i;
1525 __be32 *p, status;
1526 struct nfsd4_test_stateid_id *stateid;
1527
1528 READ_BUF(4);
1529 test_stateid->ts_num_ids = ntohl(*p++);
1530
1531 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1532
1533 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1534 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1535 if (!stateid) {
1536 status = nfserrno(-ENOMEM);
1537 goto out;
1538 }
1539
1540 INIT_LIST_HEAD(&stateid->ts_id_list);
1541 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1542
1543 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1544 if (status)
1545 goto out;
1546 }
1547
1548 status = 0;
1549 out:
1550 return status;
1551 xdr_error:
1552 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1553 status = nfserr_bad_xdr;
1554 goto out;
1555 }
1556
1557 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1558 {
1559 DECODE_HEAD;
1560
1561 READ_BUF(8);
1562 COPYMEM(&dc->clientid, 8);
1563
1564 DECODE_TAIL;
1565 }
1566
1567 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1568 {
1569 DECODE_HEAD;
1570
1571 READ_BUF(4);
1572 rc->rca_one_fs = be32_to_cpup(p++);
1573
1574 DECODE_TAIL;
1575 }
1576
1577 #ifdef CONFIG_NFSD_PNFS
1578 static __be32
1579 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1580 struct nfsd4_getdeviceinfo *gdev)
1581 {
1582 DECODE_HEAD;
1583 u32 num, i;
1584
1585 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1586 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1587 gdev->gd_layout_type = be32_to_cpup(p++);
1588 gdev->gd_maxcount = be32_to_cpup(p++);
1589 num = be32_to_cpup(p++);
1590 if (num) {
1591 if (num > 1000)
1592 goto xdr_error;
1593 READ_BUF(4 * num);
1594 gdev->gd_notify_types = be32_to_cpup(p++);
1595 for (i = 1; i < num; i++) {
1596 if (be32_to_cpup(p++)) {
1597 status = nfserr_inval;
1598 goto out;
1599 }
1600 }
1601 }
1602 DECODE_TAIL;
1603 }
1604
1605 static __be32
1606 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1607 struct nfsd4_layoutget *lgp)
1608 {
1609 DECODE_HEAD;
1610
1611 READ_BUF(36);
1612 lgp->lg_signal = be32_to_cpup(p++);
1613 lgp->lg_layout_type = be32_to_cpup(p++);
1614 lgp->lg_seg.iomode = be32_to_cpup(p++);
1615 p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1616 p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1617 p = xdr_decode_hyper(p, &lgp->lg_minlength);
1618
1619 status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1620 if (status)
1621 return status;
1622
1623 READ_BUF(4);
1624 lgp->lg_maxcount = be32_to_cpup(p++);
1625
1626 DECODE_TAIL;
1627 }
1628
1629 static __be32
1630 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1631 struct nfsd4_layoutcommit *lcp)
1632 {
1633 DECODE_HEAD;
1634 u32 timechange;
1635
1636 READ_BUF(20);
1637 p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1638 p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1639 lcp->lc_reclaim = be32_to_cpup(p++);
1640
1641 status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1642 if (status)
1643 return status;
1644
1645 READ_BUF(4);
1646 lcp->lc_newoffset = be32_to_cpup(p++);
1647 if (lcp->lc_newoffset) {
1648 READ_BUF(8);
1649 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1650 } else
1651 lcp->lc_last_wr = 0;
1652 READ_BUF(4);
1653 timechange = be32_to_cpup(p++);
1654 if (timechange) {
1655 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1656 if (status)
1657 return status;
1658 } else {
1659 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1660 }
1661 READ_BUF(8);
1662 lcp->lc_layout_type = be32_to_cpup(p++);
1663
1664 /*
1665 * Save the layout update in XDR format and let the layout driver deal
1666 * with it later.
1667 */
1668 lcp->lc_up_len = be32_to_cpup(p++);
1669 if (lcp->lc_up_len > 0) {
1670 READ_BUF(lcp->lc_up_len);
1671 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1672 }
1673
1674 DECODE_TAIL;
1675 }
1676
1677 static __be32
1678 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1679 struct nfsd4_layoutreturn *lrp)
1680 {
1681 DECODE_HEAD;
1682
1683 READ_BUF(16);
1684 lrp->lr_reclaim = be32_to_cpup(p++);
1685 lrp->lr_layout_type = be32_to_cpup(p++);
1686 lrp->lr_seg.iomode = be32_to_cpup(p++);
1687 lrp->lr_return_type = be32_to_cpup(p++);
1688 if (lrp->lr_return_type == RETURN_FILE) {
1689 READ_BUF(16);
1690 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1691 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1692
1693 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1694 if (status)
1695 return status;
1696
1697 READ_BUF(4);
1698 lrp->lrf_body_len = be32_to_cpup(p++);
1699 if (lrp->lrf_body_len > 0) {
1700 READ_BUF(lrp->lrf_body_len);
1701 READMEM(lrp->lrf_body, lrp->lrf_body_len);
1702 }
1703 } else {
1704 lrp->lr_seg.offset = 0;
1705 lrp->lr_seg.length = NFS4_MAX_UINT64;
1706 }
1707
1708 DECODE_TAIL;
1709 }
1710 #endif /* CONFIG_NFSD_PNFS */
1711
1712 static __be32
1713 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1714 struct nfsd4_fallocate *fallocate)
1715 {
1716 DECODE_HEAD;
1717
1718 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1719 if (status)
1720 return status;
1721
1722 READ_BUF(16);
1723 p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1724 xdr_decode_hyper(p, &fallocate->falloc_length);
1725
1726 DECODE_TAIL;
1727 }
1728
1729 static __be32
1730 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1731 {
1732 DECODE_HEAD;
1733
1734 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1735 if (status)
1736 return status;
1737 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1738 if (status)
1739 return status;
1740
1741 READ_BUF(8 + 8 + 8);
1742 p = xdr_decode_hyper(p, &clone->cl_src_pos);
1743 p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1744 p = xdr_decode_hyper(p, &clone->cl_count);
1745 DECODE_TAIL;
1746 }
1747
1748 static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
1749 struct nl4_server *ns)
1750 {
1751 DECODE_HEAD;
1752 struct nfs42_netaddr *naddr;
1753
1754 READ_BUF(4);
1755 ns->nl4_type = be32_to_cpup(p++);
1756
1757 /* currently support for 1 inter-server source server */
1758 switch (ns->nl4_type) {
1759 case NL4_NETADDR:
1760 naddr = &ns->u.nl4_addr;
1761
1762 READ_BUF(4);
1763 naddr->netid_len = be32_to_cpup(p++);
1764 if (naddr->netid_len > RPCBIND_MAXNETIDLEN)
1765 goto xdr_error;
1766
1767 READ_BUF(naddr->netid_len + 4); /* 4 for uaddr len */
1768 COPYMEM(naddr->netid, naddr->netid_len);
1769
1770 naddr->addr_len = be32_to_cpup(p++);
1771 if (naddr->addr_len > RPCBIND_MAXUADDRLEN)
1772 goto xdr_error;
1773
1774 READ_BUF(naddr->addr_len);
1775 COPYMEM(naddr->addr, naddr->addr_len);
1776 break;
1777 default:
1778 goto xdr_error;
1779 }
1780 DECODE_TAIL;
1781 }
1782
1783 static __be32
1784 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1785 {
1786 DECODE_HEAD;
1787 struct nl4_server *ns_dummy;
1788 int i, count;
1789
1790 status = nfsd4_decode_stateid(argp, &copy->cp_src_stateid);
1791 if (status)
1792 return status;
1793 status = nfsd4_decode_stateid(argp, &copy->cp_dst_stateid);
1794 if (status)
1795 return status;
1796
1797 READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1798 p = xdr_decode_hyper(p, &copy->cp_src_pos);
1799 p = xdr_decode_hyper(p, &copy->cp_dst_pos);
1800 p = xdr_decode_hyper(p, &copy->cp_count);
1801 p++; /* ca_consecutive: we always do consecutive copies */
1802 copy->cp_synchronous = be32_to_cpup(p++);
1803
1804 count = be32_to_cpup(p++);
1805
1806 copy->cp_intra = false;
1807 if (count == 0) { /* intra-server copy */
1808 copy->cp_intra = true;
1809 goto intra;
1810 }
1811
1812 /* decode all the supplied server addresses but use first */
1813 status = nfsd4_decode_nl4_server(argp, &copy->cp_src);
1814 if (status)
1815 return status;
1816
1817 ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL);
1818 if (ns_dummy == NULL)
1819 return nfserrno(-ENOMEM);
1820 for (i = 0; i < count - 1; i++) {
1821 status = nfsd4_decode_nl4_server(argp, ns_dummy);
1822 if (status) {
1823 kfree(ns_dummy);
1824 return status;
1825 }
1826 }
1827 kfree(ns_dummy);
1828 intra:
1829
1830 DECODE_TAIL;
1831 }
1832
1833 static __be32
1834 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
1835 struct nfsd4_offload_status *os)
1836 {
1837 return nfsd4_decode_stateid(argp, &os->stateid);
1838 }
1839
1840 static __be32
1841 nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp,
1842 struct nfsd4_copy_notify *cn)
1843 {
1844 int status;
1845
1846 status = nfsd4_decode_stateid(argp, &cn->cpn_src_stateid);
1847 if (status)
1848 return status;
1849 return nfsd4_decode_nl4_server(argp, &cn->cpn_dst);
1850 }
1851
1852 static __be32
1853 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1854 {
1855 DECODE_HEAD;
1856
1857 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1858 if (status)
1859 return status;
1860
1861 READ_BUF(8 + 4);
1862 p = xdr_decode_hyper(p, &seek->seek_offset);
1863 seek->seek_whence = be32_to_cpup(p);
1864
1865 DECODE_TAIL;
1866 }
1867
1868 static __be32
1869 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1870 {
1871 return nfs_ok;
1872 }
1873
1874 static __be32
1875 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1876 {
1877 return nfserr_notsupp;
1878 }
1879
1880 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1881
1882 static const nfsd4_dec nfsd4_dec_ops[] = {
1883 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1884 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1885 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1886 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1887 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1888 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1889 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1890 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1891 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1892 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1893 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1894 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1895 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1896 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1897 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1898 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1899 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1900 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1901 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1902 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1903 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1904 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1905 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1906 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1907 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1908 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1909 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1910 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1911 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1912 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1913 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1914 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1915 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1916 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1917 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1918 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1919 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1920
1921 /* new operations for NFSv4.1 */
1922 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1923 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1924 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1925 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1926 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1927 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1928 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1929 #ifdef CONFIG_NFSD_PNFS
1930 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1931 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1932 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit,
1933 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget,
1934 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn,
1935 #else
1936 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1937 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1938 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1939 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1940 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1941 #endif
1942 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1943 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1944 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1945 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1946 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1947 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1948 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1949
1950 /* new operations for NFSv4.2 */
1951 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1952 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy,
1953 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_copy_notify,
1954 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1955 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
1956 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
1957 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
1958 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_offload_status,
1959 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_offload_status,
1960 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1961 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
1962 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
1963 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone,
1964 };
1965
1966 static inline bool
1967 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1968 {
1969 if (op->opnum < FIRST_NFS4_OP)
1970 return false;
1971 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1972 return false;
1973 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1974 return false;
1975 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1976 return false;
1977 return true;
1978 }
1979
1980 static __be32
1981 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1982 {
1983 DECODE_HEAD;
1984 struct nfsd4_op *op;
1985 bool cachethis = false;
1986 int auth_slack= argp->rqstp->rq_auth_slack;
1987 int max_reply = auth_slack + 8; /* opcnt, status */
1988 int readcount = 0;
1989 int readbytes = 0;
1990 int i;
1991
1992 READ_BUF(4);
1993 argp->taglen = be32_to_cpup(p++);
1994 READ_BUF(argp->taglen);
1995 SAVEMEM(argp->tag, argp->taglen);
1996 READ_BUF(8);
1997 argp->minorversion = be32_to_cpup(p++);
1998 argp->opcnt = be32_to_cpup(p++);
1999 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
2000
2001 if (argp->taglen > NFSD4_MAX_TAGLEN)
2002 goto xdr_error;
2003 /*
2004 * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
2005 * here, so we return success at the xdr level so that
2006 * nfsd4_proc can handle this is an NFS-level error.
2007 */
2008 if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
2009 return 0;
2010
2011 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
2012 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
2013 if (!argp->ops) {
2014 argp->ops = argp->iops;
2015 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
2016 goto xdr_error;
2017 }
2018 }
2019
2020 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
2021 argp->opcnt = 0;
2022
2023 for (i = 0; i < argp->opcnt; i++) {
2024 op = &argp->ops[i];
2025 op->replay = NULL;
2026
2027 READ_BUF(4);
2028 op->opnum = be32_to_cpup(p++);
2029
2030 if (nfsd4_opnum_in_range(argp, op))
2031 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
2032 else {
2033 op->opnum = OP_ILLEGAL;
2034 op->status = nfserr_op_illegal;
2035 }
2036 op->opdesc = OPDESC(op);
2037 /*
2038 * We'll try to cache the result in the DRC if any one
2039 * op in the compound wants to be cached:
2040 */
2041 cachethis |= nfsd4_cache_this_op(op);
2042
2043 if (op->opnum == OP_READ) {
2044 readcount++;
2045 readbytes += nfsd4_max_reply(argp->rqstp, op);
2046 } else
2047 max_reply += nfsd4_max_reply(argp->rqstp, op);
2048 /*
2049 * OP_LOCK and OP_LOCKT may return a conflicting lock.
2050 * (Special case because it will just skip encoding this
2051 * if it runs out of xdr buffer space, and it is the only
2052 * operation that behaves this way.)
2053 */
2054 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
2055 max_reply += NFS4_OPAQUE_LIMIT;
2056
2057 if (op->status) {
2058 argp->opcnt = i+1;
2059 break;
2060 }
2061 }
2062 /* Sessions make the DRC unnecessary: */
2063 if (argp->minorversion)
2064 cachethis = false;
2065 svc_reserve(argp->rqstp, max_reply + readbytes);
2066 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
2067
2068 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
2069 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
2070
2071 DECODE_TAIL;
2072 }
2073
2074 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
2075 struct svc_export *exp)
2076 {
2077 if (exp->ex_flags & NFSEXP_V4ROOT) {
2078 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
2079 *p++ = 0;
2080 } else if (IS_I_VERSION(inode)) {
2081 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2082 } else {
2083 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2084 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2085 }
2086 return p;
2087 }
2088
2089 /*
2090 * ctime (in NFSv4, time_metadata) is not writeable, and the client
2091 * doesn't really care what resolution could theoretically be stored by
2092 * the filesystem.
2093 *
2094 * The client cares how close together changes can be while still
2095 * guaranteeing ctime changes. For most filesystems (which have
2096 * timestamps with nanosecond fields) that is limited by the resolution
2097 * of the time returned from current_time() (which I'm assuming to be
2098 * 1/HZ).
2099 */
2100 static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2101 {
2102 struct timespec64 ts;
2103 u32 ns;
2104
2105 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2106 ts = ns_to_timespec64(ns);
2107
2108 p = xdr_encode_hyper(p, ts.tv_sec);
2109 *p++ = cpu_to_be32(ts.tv_nsec);
2110
2111 return p;
2112 }
2113
2114 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2115 {
2116 *p++ = cpu_to_be32(c->atomic);
2117 if (c->change_supported) {
2118 p = xdr_encode_hyper(p, c->before_change);
2119 p = xdr_encode_hyper(p, c->after_change);
2120 } else {
2121 *p++ = cpu_to_be32(c->before_ctime_sec);
2122 *p++ = cpu_to_be32(c->before_ctime_nsec);
2123 *p++ = cpu_to_be32(c->after_ctime_sec);
2124 *p++ = cpu_to_be32(c->after_ctime_nsec);
2125 }
2126 return p;
2127 }
2128
2129 /* Encode as an array of strings the string given with components
2130 * separated @sep, escaped with esc_enter and esc_exit.
2131 */
2132 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2133 char *components, char esc_enter,
2134 char esc_exit)
2135 {
2136 __be32 *p;
2137 __be32 pathlen;
2138 int pathlen_offset;
2139 int strlen, count=0;
2140 char *str, *end, *next;
2141
2142 dprintk("nfsd4_encode_components(%s)\n", components);
2143
2144 pathlen_offset = xdr->buf->len;
2145 p = xdr_reserve_space(xdr, 4);
2146 if (!p)
2147 return nfserr_resource;
2148 p++; /* We will fill this in with @count later */
2149
2150 end = str = components;
2151 while (*end) {
2152 bool found_esc = false;
2153
2154 /* try to parse as esc_start, ..., esc_end, sep */
2155 if (*str == esc_enter) {
2156 for (; *end && (*end != esc_exit); end++)
2157 /* find esc_exit or end of string */;
2158 next = end + 1;
2159 if (*end && (!*next || *next == sep)) {
2160 str++;
2161 found_esc = true;
2162 }
2163 }
2164
2165 if (!found_esc)
2166 for (; *end && (*end != sep); end++)
2167 /* find sep or end of string */;
2168
2169 strlen = end - str;
2170 if (strlen) {
2171 p = xdr_reserve_space(xdr, strlen + 4);
2172 if (!p)
2173 return nfserr_resource;
2174 p = xdr_encode_opaque(p, str, strlen);
2175 count++;
2176 }
2177 else
2178 end++;
2179 if (found_esc)
2180 end = next;
2181
2182 str = end;
2183 }
2184 pathlen = htonl(count);
2185 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2186 return 0;
2187 }
2188
2189 /* Encode as an array of strings the string given with components
2190 * separated @sep.
2191 */
2192 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2193 char *components)
2194 {
2195 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2196 }
2197
2198 /*
2199 * encode a location element of a fs_locations structure
2200 */
2201 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2202 struct nfsd4_fs_location *location)
2203 {
2204 __be32 status;
2205
2206 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2207 '[', ']');
2208 if (status)
2209 return status;
2210 status = nfsd4_encode_components(xdr, '/', location->path);
2211 if (status)
2212 return status;
2213 return 0;
2214 }
2215
2216 /*
2217 * Encode a path in RFC3530 'pathname4' format
2218 */
2219 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2220 const struct path *root,
2221 const struct path *path)
2222 {
2223 struct path cur = *path;
2224 __be32 *p;
2225 struct dentry **components = NULL;
2226 unsigned int ncomponents = 0;
2227 __be32 err = nfserr_jukebox;
2228
2229 dprintk("nfsd4_encode_components(");
2230
2231 path_get(&cur);
2232 /* First walk the path up to the nfsd root, and store the
2233 * dentries/path components in an array.
2234 */
2235 for (;;) {
2236 if (path_equal(&cur, root))
2237 break;
2238 if (cur.dentry == cur.mnt->mnt_root) {
2239 if (follow_up(&cur))
2240 continue;
2241 goto out_free;
2242 }
2243 if ((ncomponents & 15) == 0) {
2244 struct dentry **new;
2245 new = krealloc(components,
2246 sizeof(*new) * (ncomponents + 16),
2247 GFP_KERNEL);
2248 if (!new)
2249 goto out_free;
2250 components = new;
2251 }
2252 components[ncomponents++] = cur.dentry;
2253 cur.dentry = dget_parent(cur.dentry);
2254 }
2255 err = nfserr_resource;
2256 p = xdr_reserve_space(xdr, 4);
2257 if (!p)
2258 goto out_free;
2259 *p++ = cpu_to_be32(ncomponents);
2260
2261 while (ncomponents) {
2262 struct dentry *dentry = components[ncomponents - 1];
2263 unsigned int len;
2264
2265 spin_lock(&dentry->d_lock);
2266 len = dentry->d_name.len;
2267 p = xdr_reserve_space(xdr, len + 4);
2268 if (!p) {
2269 spin_unlock(&dentry->d_lock);
2270 goto out_free;
2271 }
2272 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2273 dprintk("/%pd", dentry);
2274 spin_unlock(&dentry->d_lock);
2275 dput(dentry);
2276 ncomponents--;
2277 }
2278
2279 err = 0;
2280 out_free:
2281 dprintk(")\n");
2282 while (ncomponents)
2283 dput(components[--ncomponents]);
2284 kfree(components);
2285 path_put(&cur);
2286 return err;
2287 }
2288
2289 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2290 struct svc_rqst *rqstp, const struct path *path)
2291 {
2292 struct svc_export *exp_ps;
2293 __be32 res;
2294
2295 exp_ps = rqst_find_fsidzero_export(rqstp);
2296 if (IS_ERR(exp_ps))
2297 return nfserrno(PTR_ERR(exp_ps));
2298 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2299 exp_put(exp_ps);
2300 return res;
2301 }
2302
2303 /*
2304 * encode a fs_locations structure
2305 */
2306 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2307 struct svc_rqst *rqstp, struct svc_export *exp)
2308 {
2309 __be32 status;
2310 int i;
2311 __be32 *p;
2312 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2313
2314 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2315 if (status)
2316 return status;
2317 p = xdr_reserve_space(xdr, 4);
2318 if (!p)
2319 return nfserr_resource;
2320 *p++ = cpu_to_be32(fslocs->locations_count);
2321 for (i=0; i<fslocs->locations_count; i++) {
2322 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2323 if (status)
2324 return status;
2325 }
2326 return 0;
2327 }
2328
2329 static u32 nfs4_file_type(umode_t mode)
2330 {
2331 switch (mode & S_IFMT) {
2332 case S_IFIFO: return NF4FIFO;
2333 case S_IFCHR: return NF4CHR;
2334 case S_IFDIR: return NF4DIR;
2335 case S_IFBLK: return NF4BLK;
2336 case S_IFLNK: return NF4LNK;
2337 case S_IFREG: return NF4REG;
2338 case S_IFSOCK: return NF4SOCK;
2339 default: return NF4BAD;
2340 };
2341 }
2342
2343 static inline __be32
2344 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2345 struct nfs4_ace *ace)
2346 {
2347 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2348 return nfs4_acl_write_who(xdr, ace->whotype);
2349 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2350 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2351 else
2352 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2353 }
2354
2355 static inline __be32
2356 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2357 {
2358 __be32 *p;
2359 unsigned long i = hweight_long(layout_types);
2360
2361 p = xdr_reserve_space(xdr, 4 + 4 * i);
2362 if (!p)
2363 return nfserr_resource;
2364
2365 *p++ = cpu_to_be32(i);
2366
2367 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2368 if (layout_types & (1 << i))
2369 *p++ = cpu_to_be32(i);
2370
2371 return 0;
2372 }
2373
2374 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2375 FATTR4_WORD0_RDATTR_ERROR)
2376 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2377 #define WORD2_ABSENT_FS_ATTRS 0
2378
2379 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2380 static inline __be32
2381 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2382 void *context, int len)
2383 {
2384 __be32 *p;
2385
2386 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2387 if (!p)
2388 return nfserr_resource;
2389
2390 /*
2391 * For now we use a 0 here to indicate the null translation; in
2392 * the future we may place a call to translation code here.
2393 */
2394 *p++ = cpu_to_be32(0); /* lfs */
2395 *p++ = cpu_to_be32(0); /* pi */
2396 p = xdr_encode_opaque(p, context, len);
2397 return 0;
2398 }
2399 #else
2400 static inline __be32
2401 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2402 void *context, int len)
2403 { return 0; }
2404 #endif
2405
2406 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2407 {
2408 /* As per referral draft: */
2409 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2410 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2411 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2412 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2413 *rdattr_err = NFSERR_MOVED;
2414 else
2415 return nfserr_moved;
2416 }
2417 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2418 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2419 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2420 return 0;
2421 }
2422
2423
2424 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2425 {
2426 struct path path = exp->ex_path;
2427 int err;
2428
2429 path_get(&path);
2430 while (follow_up(&path)) {
2431 if (path.dentry != path.mnt->mnt_root)
2432 break;
2433 }
2434 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2435 path_put(&path);
2436 return err;
2437 }
2438
2439 static __be32
2440 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2441 {
2442 __be32 *p;
2443
2444 if (bmval2) {
2445 p = xdr_reserve_space(xdr, 16);
2446 if (!p)
2447 goto out_resource;
2448 *p++ = cpu_to_be32(3);
2449 *p++ = cpu_to_be32(bmval0);
2450 *p++ = cpu_to_be32(bmval1);
2451 *p++ = cpu_to_be32(bmval2);
2452 } else if (bmval1) {
2453 p = xdr_reserve_space(xdr, 12);
2454 if (!p)
2455 goto out_resource;
2456 *p++ = cpu_to_be32(2);
2457 *p++ = cpu_to_be32(bmval0);
2458 *p++ = cpu_to_be32(bmval1);
2459 } else {
2460 p = xdr_reserve_space(xdr, 8);
2461 if (!p)
2462 goto out_resource;
2463 *p++ = cpu_to_be32(1);
2464 *p++ = cpu_to_be32(bmval0);
2465 }
2466
2467 return 0;
2468 out_resource:
2469 return nfserr_resource;
2470 }
2471
2472 /*
2473 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2474 * ourselves.
2475 */
2476 static __be32
2477 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2478 struct svc_export *exp,
2479 struct dentry *dentry, u32 *bmval,
2480 struct svc_rqst *rqstp, int ignore_crossmnt)
2481 {
2482 u32 bmval0 = bmval[0];
2483 u32 bmval1 = bmval[1];
2484 u32 bmval2 = bmval[2];
2485 struct kstat stat;
2486 struct svc_fh *tempfh = NULL;
2487 struct kstatfs statfs;
2488 __be32 *p;
2489 int starting_len = xdr->buf->len;
2490 int attrlen_offset;
2491 __be32 attrlen;
2492 u32 dummy;
2493 u64 dummy64;
2494 u32 rdattr_err = 0;
2495 __be32 status;
2496 int err;
2497 struct nfs4_acl *acl = NULL;
2498 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2499 void *context = NULL;
2500 int contextlen;
2501 #endif
2502 bool contextsupport = false;
2503 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2504 u32 minorversion = resp->cstate.minorversion;
2505 struct path path = {
2506 .mnt = exp->ex_path.mnt,
2507 .dentry = dentry,
2508 };
2509 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2510
2511 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2512 BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2513
2514 if (exp->ex_fslocs.migrated) {
2515 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2516 if (status)
2517 goto out;
2518 }
2519
2520 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2521 if (err)
2522 goto out_nfserr;
2523 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2524 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2525 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2526 FATTR4_WORD1_SPACE_TOTAL))) {
2527 err = vfs_statfs(&path, &statfs);
2528 if (err)
2529 goto out_nfserr;
2530 }
2531 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2532 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2533 status = nfserr_jukebox;
2534 if (!tempfh)
2535 goto out;
2536 fh_init(tempfh, NFS4_FHSIZE);
2537 status = fh_compose(tempfh, exp, dentry, NULL);
2538 if (status)
2539 goto out;
2540 fhp = tempfh;
2541 }
2542 if (bmval0 & FATTR4_WORD0_ACL) {
2543 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2544 if (err == -EOPNOTSUPP)
2545 bmval0 &= ~FATTR4_WORD0_ACL;
2546 else if (err == -EINVAL) {
2547 status = nfserr_attrnotsupp;
2548 goto out;
2549 } else if (err != 0)
2550 goto out_nfserr;
2551 }
2552
2553 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2554 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2555 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2556 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2557 err = security_inode_getsecctx(d_inode(dentry),
2558 &context, &contextlen);
2559 else
2560 err = -EOPNOTSUPP;
2561 contextsupport = (err == 0);
2562 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2563 if (err == -EOPNOTSUPP)
2564 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2565 else if (err)
2566 goto out_nfserr;
2567 }
2568 }
2569 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2570
2571 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2572 if (status)
2573 goto out;
2574
2575 attrlen_offset = xdr->buf->len;
2576 p = xdr_reserve_space(xdr, 4);
2577 if (!p)
2578 goto out_resource;
2579 p++; /* to be backfilled later */
2580
2581 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2582 u32 supp[3];
2583
2584 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2585
2586 if (!IS_POSIXACL(dentry->d_inode))
2587 supp[0] &= ~FATTR4_WORD0_ACL;
2588 if (!contextsupport)
2589 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2590 if (!supp[2]) {
2591 p = xdr_reserve_space(xdr, 12);
2592 if (!p)
2593 goto out_resource;
2594 *p++ = cpu_to_be32(2);
2595 *p++ = cpu_to_be32(supp[0]);
2596 *p++ = cpu_to_be32(supp[1]);
2597 } else {
2598 p = xdr_reserve_space(xdr, 16);
2599 if (!p)
2600 goto out_resource;
2601 *p++ = cpu_to_be32(3);
2602 *p++ = cpu_to_be32(supp[0]);
2603 *p++ = cpu_to_be32(supp[1]);
2604 *p++ = cpu_to_be32(supp[2]);
2605 }
2606 }
2607 if (bmval0 & FATTR4_WORD0_TYPE) {
2608 p = xdr_reserve_space(xdr, 4);
2609 if (!p)
2610 goto out_resource;
2611 dummy = nfs4_file_type(stat.mode);
2612 if (dummy == NF4BAD) {
2613 status = nfserr_serverfault;
2614 goto out;
2615 }
2616 *p++ = cpu_to_be32(dummy);
2617 }
2618 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2619 p = xdr_reserve_space(xdr, 4);
2620 if (!p)
2621 goto out_resource;
2622 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2623 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2624 else
2625 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2626 NFS4_FH_VOL_RENAME);
2627 }
2628 if (bmval0 & FATTR4_WORD0_CHANGE) {
2629 p = xdr_reserve_space(xdr, 8);
2630 if (!p)
2631 goto out_resource;
2632 p = encode_change(p, &stat, d_inode(dentry), exp);
2633 }
2634 if (bmval0 & FATTR4_WORD0_SIZE) {
2635 p = xdr_reserve_space(xdr, 8);
2636 if (!p)
2637 goto out_resource;
2638 p = xdr_encode_hyper(p, stat.size);
2639 }
2640 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2641 p = xdr_reserve_space(xdr, 4);
2642 if (!p)
2643 goto out_resource;
2644 *p++ = cpu_to_be32(1);
2645 }
2646 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2647 p = xdr_reserve_space(xdr, 4);
2648 if (!p)
2649 goto out_resource;
2650 *p++ = cpu_to_be32(1);
2651 }
2652 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2653 p = xdr_reserve_space(xdr, 4);
2654 if (!p)
2655 goto out_resource;
2656 *p++ = cpu_to_be32(0);
2657 }
2658 if (bmval0 & FATTR4_WORD0_FSID) {
2659 p = xdr_reserve_space(xdr, 16);
2660 if (!p)
2661 goto out_resource;
2662 if (exp->ex_fslocs.migrated) {
2663 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2664 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2665 } else switch(fsid_source(fhp)) {
2666 case FSIDSOURCE_FSID:
2667 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2668 p = xdr_encode_hyper(p, (u64)0);
2669 break;
2670 case FSIDSOURCE_DEV:
2671 *p++ = cpu_to_be32(0);
2672 *p++ = cpu_to_be32(MAJOR(stat.dev));
2673 *p++ = cpu_to_be32(0);
2674 *p++ = cpu_to_be32(MINOR(stat.dev));
2675 break;
2676 case FSIDSOURCE_UUID:
2677 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2678 EX_UUID_LEN);
2679 break;
2680 }
2681 }
2682 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2683 p = xdr_reserve_space(xdr, 4);
2684 if (!p)
2685 goto out_resource;
2686 *p++ = cpu_to_be32(0);
2687 }
2688 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2689 p = xdr_reserve_space(xdr, 4);
2690 if (!p)
2691 goto out_resource;
2692 *p++ = cpu_to_be32(nn->nfsd4_lease);
2693 }
2694 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2695 p = xdr_reserve_space(xdr, 4);
2696 if (!p)
2697 goto out_resource;
2698 *p++ = cpu_to_be32(rdattr_err);
2699 }
2700 if (bmval0 & FATTR4_WORD0_ACL) {
2701 struct nfs4_ace *ace;
2702
2703 if (acl == NULL) {
2704 p = xdr_reserve_space(xdr, 4);
2705 if (!p)
2706 goto out_resource;
2707
2708 *p++ = cpu_to_be32(0);
2709 goto out_acl;
2710 }
2711 p = xdr_reserve_space(xdr, 4);
2712 if (!p)
2713 goto out_resource;
2714 *p++ = cpu_to_be32(acl->naces);
2715
2716 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2717 p = xdr_reserve_space(xdr, 4*3);
2718 if (!p)
2719 goto out_resource;
2720 *p++ = cpu_to_be32(ace->type);
2721 *p++ = cpu_to_be32(ace->flag);
2722 *p++ = cpu_to_be32(ace->access_mask &
2723 NFS4_ACE_MASK_ALL);
2724 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2725 if (status)
2726 goto out;
2727 }
2728 }
2729 out_acl:
2730 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2731 p = xdr_reserve_space(xdr, 4);
2732 if (!p)
2733 goto out_resource;
2734 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2735 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2736 }
2737 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2738 p = xdr_reserve_space(xdr, 4);
2739 if (!p)
2740 goto out_resource;
2741 *p++ = cpu_to_be32(1);
2742 }
2743 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2744 p = xdr_reserve_space(xdr, 4);
2745 if (!p)
2746 goto out_resource;
2747 *p++ = cpu_to_be32(0);
2748 }
2749 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2750 p = xdr_reserve_space(xdr, 4);
2751 if (!p)
2752 goto out_resource;
2753 *p++ = cpu_to_be32(1);
2754 }
2755 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2756 p = xdr_reserve_space(xdr, 4);
2757 if (!p)
2758 goto out_resource;
2759 *p++ = cpu_to_be32(1);
2760 }
2761 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2762 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2763 if (!p)
2764 goto out_resource;
2765 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2766 fhp->fh_handle.fh_size);
2767 }
2768 if (bmval0 & FATTR4_WORD0_FILEID) {
2769 p = xdr_reserve_space(xdr, 8);
2770 if (!p)
2771 goto out_resource;
2772 p = xdr_encode_hyper(p, stat.ino);
2773 }
2774 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2775 p = xdr_reserve_space(xdr, 8);
2776 if (!p)
2777 goto out_resource;
2778 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2779 }
2780 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2781 p = xdr_reserve_space(xdr, 8);
2782 if (!p)
2783 goto out_resource;
2784 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2785 }
2786 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2787 p = xdr_reserve_space(xdr, 8);
2788 if (!p)
2789 goto out_resource;
2790 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2791 }
2792 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2793 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2794 if (status)
2795 goto out;
2796 }
2797 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2798 p = xdr_reserve_space(xdr, 4);
2799 if (!p)
2800 goto out_resource;
2801 *p++ = cpu_to_be32(1);
2802 }
2803 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2804 p = xdr_reserve_space(xdr, 8);
2805 if (!p)
2806 goto out_resource;
2807 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2808 }
2809 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2810 p = xdr_reserve_space(xdr, 4);
2811 if (!p)
2812 goto out_resource;
2813 *p++ = cpu_to_be32(255);
2814 }
2815 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2816 p = xdr_reserve_space(xdr, 4);
2817 if (!p)
2818 goto out_resource;
2819 *p++ = cpu_to_be32(statfs.f_namelen);
2820 }
2821 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2822 p = xdr_reserve_space(xdr, 8);
2823 if (!p)
2824 goto out_resource;
2825 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2826 }
2827 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2828 p = xdr_reserve_space(xdr, 8);
2829 if (!p)
2830 goto out_resource;
2831 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2832 }
2833 if (bmval1 & FATTR4_WORD1_MODE) {
2834 p = xdr_reserve_space(xdr, 4);
2835 if (!p)
2836 goto out_resource;
2837 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2838 }
2839 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2840 p = xdr_reserve_space(xdr, 4);
2841 if (!p)
2842 goto out_resource;
2843 *p++ = cpu_to_be32(1);
2844 }
2845 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2846 p = xdr_reserve_space(xdr, 4);
2847 if (!p)
2848 goto out_resource;
2849 *p++ = cpu_to_be32(stat.nlink);
2850 }
2851 if (bmval1 & FATTR4_WORD1_OWNER) {
2852 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2853 if (status)
2854 goto out;
2855 }
2856 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2857 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2858 if (status)
2859 goto out;
2860 }
2861 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2862 p = xdr_reserve_space(xdr, 8);
2863 if (!p)
2864 goto out_resource;
2865 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2866 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2867 }
2868 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2869 p = xdr_reserve_space(xdr, 8);
2870 if (!p)
2871 goto out_resource;
2872 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2873 p = xdr_encode_hyper(p, dummy64);
2874 }
2875 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2876 p = xdr_reserve_space(xdr, 8);
2877 if (!p)
2878 goto out_resource;
2879 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2880 p = xdr_encode_hyper(p, dummy64);
2881 }
2882 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2883 p = xdr_reserve_space(xdr, 8);
2884 if (!p)
2885 goto out_resource;
2886 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2887 p = xdr_encode_hyper(p, dummy64);
2888 }
2889 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2890 p = xdr_reserve_space(xdr, 8);
2891 if (!p)
2892 goto out_resource;
2893 dummy64 = (u64)stat.blocks << 9;
2894 p = xdr_encode_hyper(p, dummy64);
2895 }
2896 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2897 p = xdr_reserve_space(xdr, 12);
2898 if (!p)
2899 goto out_resource;
2900 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2901 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2902 }
2903 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2904 p = xdr_reserve_space(xdr, 12);
2905 if (!p)
2906 goto out_resource;
2907 p = encode_time_delta(p, d_inode(dentry));
2908 }
2909 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2910 p = xdr_reserve_space(xdr, 12);
2911 if (!p)
2912 goto out_resource;
2913 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2914 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2915 }
2916 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2917 p = xdr_reserve_space(xdr, 12);
2918 if (!p)
2919 goto out_resource;
2920 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2921 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2922 }
2923 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2924 struct kstat parent_stat;
2925 u64 ino = stat.ino;
2926
2927 p = xdr_reserve_space(xdr, 8);
2928 if (!p)
2929 goto out_resource;
2930 /*
2931 * Get parent's attributes if not ignoring crossmount
2932 * and this is the root of a cross-mounted filesystem.
2933 */
2934 if (ignore_crossmnt == 0 &&
2935 dentry == exp->ex_path.mnt->mnt_root) {
2936 err = get_parent_attributes(exp, &parent_stat);
2937 if (err)
2938 goto out_nfserr;
2939 ino = parent_stat.ino;
2940 }
2941 p = xdr_encode_hyper(p, ino);
2942 }
2943 #ifdef CONFIG_NFSD_PNFS
2944 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2945 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2946 if (status)
2947 goto out;
2948 }
2949
2950 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2951 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2952 if (status)
2953 goto out;
2954 }
2955
2956 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2957 p = xdr_reserve_space(xdr, 4);
2958 if (!p)
2959 goto out_resource;
2960 *p++ = cpu_to_be32(stat.blksize);
2961 }
2962 #endif /* CONFIG_NFSD_PNFS */
2963 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2964 u32 supp[3];
2965
2966 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2967 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2968 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2969 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2970
2971 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2972 if (status)
2973 goto out;
2974 }
2975
2976 if (bmval2 & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
2977 p = xdr_reserve_space(xdr, 4);
2978 if (!p)
2979 goto out_resource;
2980 if (IS_I_VERSION(d_inode(dentry)))
2981 *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR);
2982 else
2983 *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_TIME_METADATA);
2984 }
2985
2986 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2987 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2988 status = nfsd4_encode_security_label(xdr, rqstp, context,
2989 contextlen);
2990 if (status)
2991 goto out;
2992 }
2993 #endif
2994
2995 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2996 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2997 status = nfs_ok;
2998
2999 out:
3000 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3001 if (context)
3002 security_release_secctx(context, contextlen);
3003 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3004 kfree(acl);
3005 if (tempfh) {
3006 fh_put(tempfh);
3007 kfree(tempfh);
3008 }
3009 if (status)
3010 xdr_truncate_encode(xdr, starting_len);
3011 return status;
3012 out_nfserr:
3013 status = nfserrno(err);
3014 goto out;
3015 out_resource:
3016 status = nfserr_resource;
3017 goto out;
3018 }
3019
3020 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3021 struct xdr_buf *buf, __be32 *p, int bytes)
3022 {
3023 xdr->scratch.iov_len = 0;
3024 memset(buf, 0, sizeof(struct xdr_buf));
3025 buf->head[0].iov_base = p;
3026 buf->head[0].iov_len = 0;
3027 buf->len = 0;
3028 xdr->buf = buf;
3029 xdr->iov = buf->head;
3030 xdr->p = p;
3031 xdr->end = (void *)p + bytes;
3032 buf->buflen = bytes;
3033 }
3034
3035 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3036 struct svc_fh *fhp, struct svc_export *exp,
3037 struct dentry *dentry, u32 *bmval,
3038 struct svc_rqst *rqstp, int ignore_crossmnt)
3039 {
3040 struct xdr_buf dummy;
3041 struct xdr_stream xdr;
3042 __be32 ret;
3043
3044 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
3045 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
3046 ignore_crossmnt);
3047 *p = xdr.p;
3048 return ret;
3049 }
3050
3051 static inline int attributes_need_mount(u32 *bmval)
3052 {
3053 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3054 return 1;
3055 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3056 return 1;
3057 return 0;
3058 }
3059
3060 static __be32
3061 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
3062 const char *name, int namlen)
3063 {
3064 struct svc_export *exp = cd->rd_fhp->fh_export;
3065 struct dentry *dentry;
3066 __be32 nfserr;
3067 int ignore_crossmnt = 0;
3068
3069 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
3070 if (IS_ERR(dentry))
3071 return nfserrno(PTR_ERR(dentry));
3072
3073 exp_get(exp);
3074 /*
3075 * In the case of a mountpoint, the client may be asking for
3076 * attributes that are only properties of the underlying filesystem
3077 * as opposed to the cross-mounted file system. In such a case,
3078 * we will not follow the cross mount and will fill the attribtutes
3079 * directly from the mountpoint dentry.
3080 */
3081 if (nfsd_mountpoint(dentry, exp)) {
3082 int err;
3083
3084 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3085 && !attributes_need_mount(cd->rd_bmval)) {
3086 ignore_crossmnt = 1;
3087 goto out_encode;
3088 }
3089 /*
3090 * Why the heck aren't we just using nfsd_lookup??
3091 * Different "."/".." handling? Something else?
3092 * At least, add a comment here to explain....
3093 */
3094 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3095 if (err) {
3096 nfserr = nfserrno(err);
3097 goto out_put;
3098 }
3099 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3100 if (nfserr)
3101 goto out_put;
3102
3103 }
3104 out_encode:
3105 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3106 cd->rd_rqstp, ignore_crossmnt);
3107 out_put:
3108 dput(dentry);
3109 exp_put(exp);
3110 return nfserr;
3111 }
3112
3113 static __be32 *
3114 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3115 {
3116 __be32 *p;
3117
3118 p = xdr_reserve_space(xdr, 20);
3119 if (!p)
3120 return NULL;
3121 *p++ = htonl(2);
3122 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3123 *p++ = htonl(0); /* bmval1 */
3124
3125 *p++ = htonl(4); /* attribute length */
3126 *p++ = nfserr; /* no htonl */
3127 return p;
3128 }
3129
3130 static int
3131 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3132 loff_t offset, u64 ino, unsigned int d_type)
3133 {
3134 struct readdir_cd *ccd = ccdv;
3135 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3136 struct xdr_stream *xdr = cd->xdr;
3137 int start_offset = xdr->buf->len;
3138 int cookie_offset;
3139 u32 name_and_cookie;
3140 int entry_bytes;
3141 __be32 nfserr = nfserr_toosmall;
3142 __be64 wire_offset;
3143 __be32 *p;
3144
3145 /* In nfsv4, "." and ".." never make it onto the wire.. */
3146 if (name && isdotent(name, namlen)) {
3147 cd->common.err = nfs_ok;
3148 return 0;
3149 }
3150
3151 if (cd->cookie_offset) {
3152 wire_offset = cpu_to_be64(offset);
3153 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3154 &wire_offset, 8);
3155 }
3156
3157 p = xdr_reserve_space(xdr, 4);
3158 if (!p)
3159 goto fail;
3160 *p++ = xdr_one; /* mark entry present */
3161 cookie_offset = xdr->buf->len;
3162 p = xdr_reserve_space(xdr, 3*4 + namlen);
3163 if (!p)
3164 goto fail;
3165 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
3166 p = xdr_encode_array(p, name, namlen); /* name length & name */
3167
3168 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3169 switch (nfserr) {
3170 case nfs_ok:
3171 break;
3172 case nfserr_resource:
3173 nfserr = nfserr_toosmall;
3174 goto fail;
3175 case nfserr_noent:
3176 xdr_truncate_encode(xdr, start_offset);
3177 goto skip_entry;
3178 default:
3179 /*
3180 * If the client requested the RDATTR_ERROR attribute,
3181 * we stuff the error code into this attribute
3182 * and continue. If this attribute was not requested,
3183 * then in accordance with the spec, we fail the
3184 * entire READDIR operation(!)
3185 */
3186 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3187 goto fail;
3188 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3189 if (p == NULL) {
3190 nfserr = nfserr_toosmall;
3191 goto fail;
3192 }
3193 }
3194 nfserr = nfserr_toosmall;
3195 entry_bytes = xdr->buf->len - start_offset;
3196 if (entry_bytes > cd->rd_maxcount)
3197 goto fail;
3198 cd->rd_maxcount -= entry_bytes;
3199 /*
3200 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3201 * let's always let through the first entry, at least:
3202 */
3203 if (!cd->rd_dircount)
3204 goto fail;
3205 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3206 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3207 goto fail;
3208 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3209
3210 cd->cookie_offset = cookie_offset;
3211 skip_entry:
3212 cd->common.err = nfs_ok;
3213 return 0;
3214 fail:
3215 xdr_truncate_encode(xdr, start_offset);
3216 cd->common.err = nfserr;
3217 return -EINVAL;
3218 }
3219
3220 static __be32
3221 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3222 {
3223 __be32 *p;
3224
3225 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3226 if (!p)
3227 return nfserr_resource;
3228 *p++ = cpu_to_be32(sid->si_generation);
3229 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3230 sizeof(stateid_opaque_t));
3231 return 0;
3232 }
3233
3234 static __be32
3235 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3236 {
3237 struct xdr_stream *xdr = &resp->xdr;
3238 __be32 *p;
3239
3240 p = xdr_reserve_space(xdr, 8);
3241 if (!p)
3242 return nfserr_resource;
3243 *p++ = cpu_to_be32(access->ac_supported);
3244 *p++ = cpu_to_be32(access->ac_resp_access);
3245 return 0;
3246 }
3247
3248 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3249 {
3250 struct xdr_stream *xdr = &resp->xdr;
3251 __be32 *p;
3252
3253 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3254 if (!p)
3255 return nfserr_resource;
3256 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3257 NFS4_MAX_SESSIONID_LEN);
3258 *p++ = cpu_to_be32(bcts->dir);
3259 /* Upshifting from TCP to RDMA is not supported */
3260 *p++ = cpu_to_be32(0);
3261 return 0;
3262 }
3263
3264 static __be32
3265 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3266 {
3267 struct xdr_stream *xdr = &resp->xdr;
3268
3269 return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3270 }
3271
3272
3273 static __be32
3274 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3275 {
3276 struct xdr_stream *xdr = &resp->xdr;
3277 __be32 *p;
3278
3279 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3280 if (!p)
3281 return nfserr_resource;
3282 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3283 NFS4_VERIFIER_SIZE);
3284 return 0;
3285 }
3286
3287 static __be32
3288 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3289 {
3290 struct xdr_stream *xdr = &resp->xdr;
3291 __be32 *p;
3292
3293 p = xdr_reserve_space(xdr, 20);
3294 if (!p)
3295 return nfserr_resource;
3296 encode_cinfo(p, &create->cr_cinfo);
3297 return nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3298 create->cr_bmval[1], create->cr_bmval[2]);
3299 }
3300
3301 static __be32
3302 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3303 {
3304 struct svc_fh *fhp = getattr->ga_fhp;
3305 struct xdr_stream *xdr = &resp->xdr;
3306
3307 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3308 getattr->ga_bmval, resp->rqstp, 0);
3309 }
3310
3311 static __be32
3312 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3313 {
3314 struct xdr_stream *xdr = &resp->xdr;
3315 struct svc_fh *fhp = *fhpp;
3316 unsigned int len;
3317 __be32 *p;
3318
3319 len = fhp->fh_handle.fh_size;
3320 p = xdr_reserve_space(xdr, len + 4);
3321 if (!p)
3322 return nfserr_resource;
3323 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3324 return 0;
3325 }
3326
3327 /*
3328 * Including all fields other than the name, a LOCK4denied structure requires
3329 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3330 */
3331 static __be32
3332 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3333 {
3334 struct xdr_netobj *conf = &ld->ld_owner;
3335 __be32 *p;
3336
3337 again:
3338 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3339 if (!p) {
3340 /*
3341 * Don't fail to return the result just because we can't
3342 * return the conflicting open:
3343 */
3344 if (conf->len) {
3345 kfree(conf->data);
3346 conf->len = 0;
3347 conf->data = NULL;
3348 goto again;
3349 }
3350 return nfserr_resource;
3351 }
3352 p = xdr_encode_hyper(p, ld->ld_start);
3353 p = xdr_encode_hyper(p, ld->ld_length);
3354 *p++ = cpu_to_be32(ld->ld_type);
3355 if (conf->len) {
3356 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3357 p = xdr_encode_opaque(p, conf->data, conf->len);
3358 kfree(conf->data);
3359 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
3360 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3361 *p++ = cpu_to_be32(0); /* length of owner name */
3362 }
3363 return nfserr_denied;
3364 }
3365
3366 static __be32
3367 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3368 {
3369 struct xdr_stream *xdr = &resp->xdr;
3370
3371 if (!nfserr)
3372 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3373 else if (nfserr == nfserr_denied)
3374 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3375
3376 return nfserr;
3377 }
3378
3379 static __be32
3380 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3381 {
3382 struct xdr_stream *xdr = &resp->xdr;
3383
3384 if (nfserr == nfserr_denied)
3385 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3386 return nfserr;
3387 }
3388
3389 static __be32
3390 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3391 {
3392 struct xdr_stream *xdr = &resp->xdr;
3393
3394 return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3395 }
3396
3397
3398 static __be32
3399 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3400 {
3401 struct xdr_stream *xdr = &resp->xdr;
3402 __be32 *p;
3403
3404 p = xdr_reserve_space(xdr, 20);
3405 if (!p)
3406 return nfserr_resource;
3407 p = encode_cinfo(p, &link->li_cinfo);
3408 return 0;
3409 }
3410
3411
3412 static __be32
3413 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3414 {
3415 struct xdr_stream *xdr = &resp->xdr;
3416 __be32 *p;
3417
3418 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3419 if (nfserr)
3420 return nfserr;
3421 p = xdr_reserve_space(xdr, 24);
3422 if (!p)
3423 return nfserr_resource;
3424 p = encode_cinfo(p, &open->op_cinfo);
3425 *p++ = cpu_to_be32(open->op_rflags);
3426
3427 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3428 open->op_bmval[2]);
3429 if (nfserr)
3430 return nfserr;
3431
3432 p = xdr_reserve_space(xdr, 4);
3433 if (!p)
3434 return nfserr_resource;
3435
3436 *p++ = cpu_to_be32(open->op_delegate_type);
3437 switch (open->op_delegate_type) {
3438 case NFS4_OPEN_DELEGATE_NONE:
3439 break;
3440 case NFS4_OPEN_DELEGATE_READ:
3441 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3442 if (nfserr)
3443 return nfserr;
3444 p = xdr_reserve_space(xdr, 20);
3445 if (!p)
3446 return nfserr_resource;
3447 *p++ = cpu_to_be32(open->op_recall);
3448
3449 /*
3450 * TODO: ACE's in delegations
3451 */
3452 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3453 *p++ = cpu_to_be32(0);
3454 *p++ = cpu_to_be32(0);
3455 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3456 break;
3457 case NFS4_OPEN_DELEGATE_WRITE:
3458 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3459 if (nfserr)
3460 return nfserr;
3461 p = xdr_reserve_space(xdr, 32);
3462 if (!p)
3463 return nfserr_resource;
3464 *p++ = cpu_to_be32(0);
3465
3466 /*
3467 * TODO: space_limit's in delegations
3468 */
3469 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3470 *p++ = cpu_to_be32(~(u32)0);
3471 *p++ = cpu_to_be32(~(u32)0);
3472
3473 /*
3474 * TODO: ACE's in delegations
3475 */
3476 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3477 *p++ = cpu_to_be32(0);
3478 *p++ = cpu_to_be32(0);
3479 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3480 break;
3481 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3482 switch (open->op_why_no_deleg) {
3483 case WND4_CONTENTION:
3484 case WND4_RESOURCE:
3485 p = xdr_reserve_space(xdr, 8);
3486 if (!p)
3487 return nfserr_resource;
3488 *p++ = cpu_to_be32(open->op_why_no_deleg);
3489 /* deleg signaling not supported yet: */
3490 *p++ = cpu_to_be32(0);
3491 break;
3492 default:
3493 p = xdr_reserve_space(xdr, 4);
3494 if (!p)
3495 return nfserr_resource;
3496 *p++ = cpu_to_be32(open->op_why_no_deleg);
3497 }
3498 break;
3499 default:
3500 BUG();
3501 }
3502 /* XXX save filehandle here */
3503 return 0;
3504 }
3505
3506 static __be32
3507 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3508 {
3509 struct xdr_stream *xdr = &resp->xdr;
3510
3511 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3512 }
3513
3514 static __be32
3515 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3516 {
3517 struct xdr_stream *xdr = &resp->xdr;
3518
3519 return nfsd4_encode_stateid(xdr, &od->od_stateid);
3520 }
3521
3522 static __be32 nfsd4_encode_splice_read(
3523 struct nfsd4_compoundres *resp,
3524 struct nfsd4_read *read,
3525 struct file *file, unsigned long maxcount)
3526 {
3527 struct xdr_stream *xdr = &resp->xdr;
3528 struct xdr_buf *buf = xdr->buf;
3529 u32 eof;
3530 int space_left;
3531 __be32 nfserr;
3532 __be32 *p = xdr->p - 2;
3533
3534 /* Make sure there will be room for padding if needed */
3535 if (xdr->end - xdr->p < 1)
3536 return nfserr_resource;
3537
3538 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3539 file, read->rd_offset, &maxcount, &eof);
3540 read->rd_length = maxcount;
3541 if (nfserr) {
3542 /*
3543 * nfsd_splice_actor may have already messed with the
3544 * page length; reset it so as not to confuse
3545 * xdr_truncate_encode:
3546 */
3547 buf->page_len = 0;
3548 return nfserr;
3549 }
3550
3551 *(p++) = htonl(eof);
3552 *(p++) = htonl(maxcount);
3553
3554 buf->page_len = maxcount;
3555 buf->len += maxcount;
3556 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3557 / PAGE_SIZE;
3558
3559 /* Use rest of head for padding and remaining ops: */
3560 buf->tail[0].iov_base = xdr->p;
3561 buf->tail[0].iov_len = 0;
3562 xdr->iov = buf->tail;
3563 if (maxcount&3) {
3564 int pad = 4 - (maxcount&3);
3565
3566 *(xdr->p++) = 0;
3567
3568 buf->tail[0].iov_base += maxcount&3;
3569 buf->tail[0].iov_len = pad;
3570 buf->len += pad;
3571 }
3572
3573 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3574 buf->buflen - buf->len);
3575 buf->buflen = buf->len + space_left;
3576 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3577
3578 return 0;
3579 }
3580
3581 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3582 struct nfsd4_read *read,
3583 struct file *file, unsigned long maxcount)
3584 {
3585 struct xdr_stream *xdr = &resp->xdr;
3586 u32 eof;
3587 int v;
3588 int starting_len = xdr->buf->len - 8;
3589 long len;
3590 int thislen;
3591 __be32 nfserr;
3592 __be32 tmp;
3593 __be32 *p;
3594 int pad;
3595
3596 /*
3597 * svcrdma requires every READ payload to start somewhere
3598 * in xdr->pages.
3599 */
3600 if (xdr->iov == xdr->buf->head) {
3601 xdr->iov = NULL;
3602 xdr->end = xdr->p;
3603 }
3604
3605 len = maxcount;
3606 v = 0;
3607 while (len) {
3608 thislen = min_t(long, len, PAGE_SIZE);
3609 p = xdr_reserve_space(xdr, thislen);
3610 WARN_ON_ONCE(!p);
3611 resp->rqstp->rq_vec[v].iov_base = p;
3612 resp->rqstp->rq_vec[v].iov_len = thislen;
3613 v++;
3614 len -= thislen;
3615 }
3616 read->rd_vlen = v;
3617
3618 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3619 resp->rqstp->rq_vec, read->rd_vlen, &maxcount,
3620 &eof);
3621 read->rd_length = maxcount;
3622 if (nfserr)
3623 return nfserr;
3624 if (svc_encode_read_payload(resp->rqstp, starting_len + 8, maxcount))
3625 return nfserr_io;
3626 xdr_truncate_encode(xdr, starting_len + 8 + xdr_align_size(maxcount));
3627
3628 tmp = htonl(eof);
3629 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3630 tmp = htonl(maxcount);
3631 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3632
3633 tmp = xdr_zero;
3634 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3635 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3636 &tmp, pad);
3637 return 0;
3638
3639 }
3640
3641 static __be32
3642 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3643 struct nfsd4_read *read)
3644 {
3645 unsigned long maxcount;
3646 struct xdr_stream *xdr = &resp->xdr;
3647 struct file *file;
3648 int starting_len = xdr->buf->len;
3649 __be32 *p;
3650
3651 if (nfserr)
3652 return nfserr;
3653 file = read->rd_nf->nf_file;
3654
3655 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3656 if (!p) {
3657 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3658 return nfserr_resource;
3659 }
3660 if (resp->xdr.buf->page_len &&
3661 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3662 WARN_ON_ONCE(1);
3663 return nfserr_resource;
3664 }
3665 xdr_commit_encode(xdr);
3666
3667 maxcount = svc_max_payload(resp->rqstp);
3668 maxcount = min_t(unsigned long, maxcount,
3669 (xdr->buf->buflen - xdr->buf->len));
3670 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3671
3672 if (file->f_op->splice_read &&
3673 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3674 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3675 else
3676 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3677
3678 if (nfserr)
3679 xdr_truncate_encode(xdr, starting_len);
3680
3681 return nfserr;
3682 }
3683
3684 static __be32
3685 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3686 {
3687 int maxcount;
3688 __be32 wire_count;
3689 int zero = 0;
3690 struct xdr_stream *xdr = &resp->xdr;
3691 int length_offset = xdr->buf->len;
3692 __be32 *p;
3693
3694 p = xdr_reserve_space(xdr, 4);
3695 if (!p)
3696 return nfserr_resource;
3697 maxcount = PAGE_SIZE;
3698
3699 p = xdr_reserve_space(xdr, maxcount);
3700 if (!p)
3701 return nfserr_resource;
3702 /*
3703 * XXX: By default, vfs_readlink() will truncate symlinks if they
3704 * would overflow the buffer. Is this kosher in NFSv4? If not, one
3705 * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3706 * that truncation occurred, and return NFS4ERR_RESOURCE.
3707 */
3708 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3709 (char *)p, &maxcount);
3710 if (nfserr == nfserr_isdir)
3711 nfserr = nfserr_inval;
3712 if (nfserr) {
3713 xdr_truncate_encode(xdr, length_offset);
3714 return nfserr;
3715 }
3716
3717 wire_count = htonl(maxcount);
3718 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3719 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3720 if (maxcount & 3)
3721 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3722 &zero, 4 - (maxcount&3));
3723 return 0;
3724 }
3725
3726 static __be32
3727 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3728 {
3729 int maxcount;
3730 int bytes_left;
3731 loff_t offset;
3732 __be64 wire_offset;
3733 struct xdr_stream *xdr = &resp->xdr;
3734 int starting_len = xdr->buf->len;
3735 __be32 *p;
3736
3737 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3738 if (!p)
3739 return nfserr_resource;
3740
3741 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3742 *p++ = cpu_to_be32(0);
3743 *p++ = cpu_to_be32(0);
3744 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3745 - (char *)resp->xdr.buf->head[0].iov_base;
3746
3747 /*
3748 * Number of bytes left for directory entries allowing for the
3749 * final 8 bytes of the readdir and a following failed op:
3750 */
3751 bytes_left = xdr->buf->buflen - xdr->buf->len
3752 - COMPOUND_ERR_SLACK_SPACE - 8;
3753 if (bytes_left < 0) {
3754 nfserr = nfserr_resource;
3755 goto err_no_verf;
3756 }
3757 maxcount = svc_max_payload(resp->rqstp);
3758 maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3759 /*
3760 * Note the rfc defines rd_maxcount as the size of the
3761 * READDIR4resok structure, which includes the verifier above
3762 * and the 8 bytes encoded at the end of this function:
3763 */
3764 if (maxcount < 16) {
3765 nfserr = nfserr_toosmall;
3766 goto err_no_verf;
3767 }
3768 maxcount = min_t(int, maxcount-16, bytes_left);
3769
3770 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3771 if (!readdir->rd_dircount)
3772 readdir->rd_dircount = svc_max_payload(resp->rqstp);
3773
3774 readdir->xdr = xdr;
3775 readdir->rd_maxcount = maxcount;
3776 readdir->common.err = 0;
3777 readdir->cookie_offset = 0;
3778
3779 offset = readdir->rd_cookie;
3780 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3781 &offset,
3782 &readdir->common, nfsd4_encode_dirent);
3783 if (nfserr == nfs_ok &&
3784 readdir->common.err == nfserr_toosmall &&
3785 xdr->buf->len == starting_len + 8) {
3786 /* nothing encoded; which limit did we hit?: */
3787 if (maxcount - 16 < bytes_left)
3788 /* It was the fault of rd_maxcount: */
3789 nfserr = nfserr_toosmall;
3790 else
3791 /* We ran out of buffer space: */
3792 nfserr = nfserr_resource;
3793 }
3794 if (nfserr)
3795 goto err_no_verf;
3796
3797 if (readdir->cookie_offset) {
3798 wire_offset = cpu_to_be64(offset);
3799 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3800 &wire_offset, 8);
3801 }
3802
3803 p = xdr_reserve_space(xdr, 8);
3804 if (!p) {
3805 WARN_ON_ONCE(1);
3806 goto err_no_verf;
3807 }
3808 *p++ = 0; /* no more entries */
3809 *p++ = htonl(readdir->common.err == nfserr_eof);
3810
3811 return 0;
3812 err_no_verf:
3813 xdr_truncate_encode(xdr, starting_len);
3814 return nfserr;
3815 }
3816
3817 static __be32
3818 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3819 {
3820 struct xdr_stream *xdr = &resp->xdr;
3821 __be32 *p;
3822
3823 p = xdr_reserve_space(xdr, 20);
3824 if (!p)
3825 return nfserr_resource;
3826 p = encode_cinfo(p, &remove->rm_cinfo);
3827 return 0;
3828 }
3829
3830 static __be32
3831 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3832 {
3833 struct xdr_stream *xdr = &resp->xdr;
3834 __be32 *p;
3835
3836 p = xdr_reserve_space(xdr, 40);
3837 if (!p)
3838 return nfserr_resource;
3839 p = encode_cinfo(p, &rename->rn_sinfo);
3840 p = encode_cinfo(p, &rename->rn_tinfo);
3841 return 0;
3842 }
3843
3844 static __be32
3845 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
3846 {
3847 u32 i, nflavs, supported;
3848 struct exp_flavor_info *flavs;
3849 struct exp_flavor_info def_flavs[2];
3850 __be32 *p, *flavorsp;
3851 static bool report = true;
3852
3853 if (exp->ex_nflavors) {
3854 flavs = exp->ex_flavors;
3855 nflavs = exp->ex_nflavors;
3856 } else { /* Handling of some defaults in absence of real secinfo: */
3857 flavs = def_flavs;
3858 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3859 nflavs = 2;
3860 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3861 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3862 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3863 nflavs = 1;
3864 flavs[0].pseudoflavor
3865 = svcauth_gss_flavor(exp->ex_client);
3866 } else {
3867 nflavs = 1;
3868 flavs[0].pseudoflavor
3869 = exp->ex_client->flavour->flavour;
3870 }
3871 }
3872
3873 supported = 0;
3874 p = xdr_reserve_space(xdr, 4);
3875 if (!p)
3876 return nfserr_resource;
3877 flavorsp = p++; /* to be backfilled later */
3878
3879 for (i = 0; i < nflavs; i++) {
3880 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3881 struct rpcsec_gss_info info;
3882
3883 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3884 supported++;
3885 p = xdr_reserve_space(xdr, 4 + 4 +
3886 XDR_LEN(info.oid.len) + 4 + 4);
3887 if (!p)
3888 return nfserr_resource;
3889 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3890 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3891 *p++ = cpu_to_be32(info.qop);
3892 *p++ = cpu_to_be32(info.service);
3893 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3894 supported++;
3895 p = xdr_reserve_space(xdr, 4);
3896 if (!p)
3897 return nfserr_resource;
3898 *p++ = cpu_to_be32(pf);
3899 } else {
3900 if (report)
3901 pr_warn("NFS: SECINFO: security flavor %u "
3902 "is not supported\n", pf);
3903 }
3904 }
3905
3906 if (nflavs != supported)
3907 report = false;
3908 *flavorsp = htonl(supported);
3909 return 0;
3910 }
3911
3912 static __be32
3913 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3914 struct nfsd4_secinfo *secinfo)
3915 {
3916 struct xdr_stream *xdr = &resp->xdr;
3917
3918 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
3919 }
3920
3921 static __be32
3922 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3923 struct nfsd4_secinfo_no_name *secinfo)
3924 {
3925 struct xdr_stream *xdr = &resp->xdr;
3926
3927 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
3928 }
3929
3930 /*
3931 * The SETATTR encode routine is special -- it always encodes a bitmap,
3932 * regardless of the error status.
3933 */
3934 static __be32
3935 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3936 {
3937 struct xdr_stream *xdr = &resp->xdr;
3938 __be32 *p;
3939
3940 p = xdr_reserve_space(xdr, 16);
3941 if (!p)
3942 return nfserr_resource;
3943 if (nfserr) {
3944 *p++ = cpu_to_be32(3);
3945 *p++ = cpu_to_be32(0);
3946 *p++ = cpu_to_be32(0);
3947 *p++ = cpu_to_be32(0);
3948 }
3949 else {
3950 *p++ = cpu_to_be32(3);
3951 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3952 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3953 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3954 }
3955 return nfserr;
3956 }
3957
3958 static __be32
3959 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3960 {
3961 struct xdr_stream *xdr = &resp->xdr;
3962 __be32 *p;
3963
3964 if (!nfserr) {
3965 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3966 if (!p)
3967 return nfserr_resource;
3968 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3969 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3970 NFS4_VERIFIER_SIZE);
3971 }
3972 else if (nfserr == nfserr_clid_inuse) {
3973 p = xdr_reserve_space(xdr, 8);
3974 if (!p)
3975 return nfserr_resource;
3976 *p++ = cpu_to_be32(0);
3977 *p++ = cpu_to_be32(0);
3978 }
3979 return nfserr;
3980 }
3981
3982 static __be32
3983 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3984 {
3985 struct xdr_stream *xdr = &resp->xdr;
3986 __be32 *p;
3987
3988 p = xdr_reserve_space(xdr, 16);
3989 if (!p)
3990 return nfserr_resource;
3991 *p++ = cpu_to_be32(write->wr_bytes_written);
3992 *p++ = cpu_to_be32(write->wr_how_written);
3993 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3994 NFS4_VERIFIER_SIZE);
3995 return 0;
3996 }
3997
3998 static __be32
3999 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
4000 struct nfsd4_exchange_id *exid)
4001 {
4002 struct xdr_stream *xdr = &resp->xdr;
4003 __be32 *p;
4004 char *major_id;
4005 char *server_scope;
4006 int major_id_sz;
4007 int server_scope_sz;
4008 uint64_t minor_id = 0;
4009 struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
4010
4011 major_id = nn->nfsd_name;
4012 major_id_sz = strlen(nn->nfsd_name);
4013 server_scope = nn->nfsd_name;
4014 server_scope_sz = strlen(nn->nfsd_name);
4015
4016 p = xdr_reserve_space(xdr,
4017 8 /* eir_clientid */ +
4018 4 /* eir_sequenceid */ +
4019 4 /* eir_flags */ +
4020 4 /* spr_how */);
4021 if (!p)
4022 return nfserr_resource;
4023
4024 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
4025 *p++ = cpu_to_be32(exid->seqid);
4026 *p++ = cpu_to_be32(exid->flags);
4027
4028 *p++ = cpu_to_be32(exid->spa_how);
4029
4030 switch (exid->spa_how) {
4031 case SP4_NONE:
4032 break;
4033 case SP4_MACH_CRED:
4034 /* spo_must_enforce bitmap: */
4035 nfserr = nfsd4_encode_bitmap(xdr,
4036 exid->spo_must_enforce[0],
4037 exid->spo_must_enforce[1],
4038 exid->spo_must_enforce[2]);
4039 if (nfserr)
4040 return nfserr;
4041 /* spo_must_allow bitmap: */
4042 nfserr = nfsd4_encode_bitmap(xdr,
4043 exid->spo_must_allow[0],
4044 exid->spo_must_allow[1],
4045 exid->spo_must_allow[2]);
4046 if (nfserr)
4047 return nfserr;
4048 break;
4049 default:
4050 WARN_ON_ONCE(1);
4051 }
4052
4053 p = xdr_reserve_space(xdr,
4054 8 /* so_minor_id */ +
4055 4 /* so_major_id.len */ +
4056 (XDR_QUADLEN(major_id_sz) * 4) +
4057 4 /* eir_server_scope.len */ +
4058 (XDR_QUADLEN(server_scope_sz) * 4) +
4059 4 /* eir_server_impl_id.count (0) */);
4060 if (!p)
4061 return nfserr_resource;
4062
4063 /* The server_owner struct */
4064 p = xdr_encode_hyper(p, minor_id); /* Minor id */
4065 /* major id */
4066 p = xdr_encode_opaque(p, major_id, major_id_sz);
4067
4068 /* Server scope */
4069 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4070
4071 /* Implementation id */
4072 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
4073 return 0;
4074 }
4075
4076 static __be32
4077 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4078 struct nfsd4_create_session *sess)
4079 {
4080 struct xdr_stream *xdr = &resp->xdr;
4081 __be32 *p;
4082
4083 p = xdr_reserve_space(xdr, 24);
4084 if (!p)
4085 return nfserr_resource;
4086 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4087 NFS4_MAX_SESSIONID_LEN);
4088 *p++ = cpu_to_be32(sess->seqid);
4089 *p++ = cpu_to_be32(sess->flags);
4090
4091 p = xdr_reserve_space(xdr, 28);
4092 if (!p)
4093 return nfserr_resource;
4094 *p++ = cpu_to_be32(0); /* headerpadsz */
4095 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4096 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4097 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4098 *p++ = cpu_to_be32(sess->fore_channel.maxops);
4099 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4100 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4101
4102 if (sess->fore_channel.nr_rdma_attrs) {
4103 p = xdr_reserve_space(xdr, 4);
4104 if (!p)
4105 return nfserr_resource;
4106 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4107 }
4108
4109 p = xdr_reserve_space(xdr, 28);
4110 if (!p)
4111 return nfserr_resource;
4112 *p++ = cpu_to_be32(0); /* headerpadsz */
4113 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4114 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4115 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4116 *p++ = cpu_to_be32(sess->back_channel.maxops);
4117 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4118 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4119
4120 if (sess->back_channel.nr_rdma_attrs) {
4121 p = xdr_reserve_space(xdr, 4);
4122 if (!p)
4123 return nfserr_resource;
4124 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4125 }
4126 return 0;
4127 }
4128
4129 static __be32
4130 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4131 struct nfsd4_sequence *seq)
4132 {
4133 struct xdr_stream *xdr = &resp->xdr;
4134 __be32 *p;
4135
4136 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4137 if (!p)
4138 return nfserr_resource;
4139 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4140 NFS4_MAX_SESSIONID_LEN);
4141 *p++ = cpu_to_be32(seq->seqid);
4142 *p++ = cpu_to_be32(seq->slotid);
4143 /* Note slotid's are numbered from zero: */
4144 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4145 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4146 *p++ = cpu_to_be32(seq->status_flags);
4147
4148 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4149 return 0;
4150 }
4151
4152 static __be32
4153 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4154 struct nfsd4_test_stateid *test_stateid)
4155 {
4156 struct xdr_stream *xdr = &resp->xdr;
4157 struct nfsd4_test_stateid_id *stateid, *next;
4158 __be32 *p;
4159
4160 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4161 if (!p)
4162 return nfserr_resource;
4163 *p++ = htonl(test_stateid->ts_num_ids);
4164
4165 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4166 *p++ = stateid->ts_id_status;
4167 }
4168
4169 return 0;
4170 }
4171
4172 #ifdef CONFIG_NFSD_PNFS
4173 static __be32
4174 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4175 struct nfsd4_getdeviceinfo *gdev)
4176 {
4177 struct xdr_stream *xdr = &resp->xdr;
4178 const struct nfsd4_layout_ops *ops;
4179 u32 starting_len = xdr->buf->len, needed_len;
4180 __be32 *p;
4181
4182 p = xdr_reserve_space(xdr, 4);
4183 if (!p)
4184 return nfserr_resource;
4185
4186 *p++ = cpu_to_be32(gdev->gd_layout_type);
4187
4188 /* If maxcount is 0 then just update notifications */
4189 if (gdev->gd_maxcount != 0) {
4190 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4191 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4192 if (nfserr) {
4193 /*
4194 * We don't bother to burden the layout drivers with
4195 * enforcing gd_maxcount, just tell the client to
4196 * come back with a bigger buffer if it's not enough.
4197 */
4198 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4199 goto toosmall;
4200 return nfserr;
4201 }
4202 }
4203
4204 if (gdev->gd_notify_types) {
4205 p = xdr_reserve_space(xdr, 4 + 4);
4206 if (!p)
4207 return nfserr_resource;
4208 *p++ = cpu_to_be32(1); /* bitmap length */
4209 *p++ = cpu_to_be32(gdev->gd_notify_types);
4210 } else {
4211 p = xdr_reserve_space(xdr, 4);
4212 if (!p)
4213 return nfserr_resource;
4214 *p++ = 0;
4215 }
4216
4217 return 0;
4218 toosmall:
4219 dprintk("%s: maxcount too small\n", __func__);
4220 needed_len = xdr->buf->len + 4 /* notifications */;
4221 xdr_truncate_encode(xdr, starting_len);
4222 p = xdr_reserve_space(xdr, 4);
4223 if (!p)
4224 return nfserr_resource;
4225 *p++ = cpu_to_be32(needed_len);
4226 return nfserr_toosmall;
4227 }
4228
4229 static __be32
4230 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4231 struct nfsd4_layoutget *lgp)
4232 {
4233 struct xdr_stream *xdr = &resp->xdr;
4234 const struct nfsd4_layout_ops *ops;
4235 __be32 *p;
4236
4237 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4238 if (!p)
4239 return nfserr_resource;
4240
4241 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4242 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4243 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4244 sizeof(stateid_opaque_t));
4245
4246 *p++ = cpu_to_be32(1); /* we always return a single layout */
4247 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4248 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4249 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4250 *p++ = cpu_to_be32(lgp->lg_layout_type);
4251
4252 ops = nfsd4_layout_ops[lgp->lg_layout_type];
4253 return ops->encode_layoutget(xdr, lgp);
4254 }
4255
4256 static __be32
4257 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4258 struct nfsd4_layoutcommit *lcp)
4259 {
4260 struct xdr_stream *xdr = &resp->xdr;
4261 __be32 *p;
4262
4263 p = xdr_reserve_space(xdr, 4);
4264 if (!p)
4265 return nfserr_resource;
4266 *p++ = cpu_to_be32(lcp->lc_size_chg);
4267 if (lcp->lc_size_chg) {
4268 p = xdr_reserve_space(xdr, 8);
4269 if (!p)
4270 return nfserr_resource;
4271 p = xdr_encode_hyper(p, lcp->lc_newsize);
4272 }
4273
4274 return 0;
4275 }
4276
4277 static __be32
4278 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4279 struct nfsd4_layoutreturn *lrp)
4280 {
4281 struct xdr_stream *xdr = &resp->xdr;
4282 __be32 *p;
4283
4284 p = xdr_reserve_space(xdr, 4);
4285 if (!p)
4286 return nfserr_resource;
4287 *p++ = cpu_to_be32(lrp->lrs_present);
4288 if (lrp->lrs_present)
4289 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4290 return 0;
4291 }
4292 #endif /* CONFIG_NFSD_PNFS */
4293
4294 static __be32
4295 nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
4296 struct nfsd42_write_res *write, bool sync)
4297 {
4298 __be32 *p;
4299 p = xdr_reserve_space(&resp->xdr, 4);
4300 if (!p)
4301 return nfserr_resource;
4302
4303 if (sync)
4304 *p++ = cpu_to_be32(0);
4305 else {
4306 __be32 nfserr;
4307 *p++ = cpu_to_be32(1);
4308 nfserr = nfsd4_encode_stateid(&resp->xdr, &write->cb_stateid);
4309 if (nfserr)
4310 return nfserr;
4311 }
4312 p = xdr_reserve_space(&resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
4313 if (!p)
4314 return nfserr_resource;
4315
4316 p = xdr_encode_hyper(p, write->wr_bytes_written);
4317 *p++ = cpu_to_be32(write->wr_stable_how);
4318 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4319 NFS4_VERIFIER_SIZE);
4320 return nfs_ok;
4321 }
4322
4323 static __be32
4324 nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns)
4325 {
4326 struct xdr_stream *xdr = &resp->xdr;
4327 struct nfs42_netaddr *addr;
4328 __be32 *p;
4329
4330 p = xdr_reserve_space(xdr, 4);
4331 *p++ = cpu_to_be32(ns->nl4_type);
4332
4333 switch (ns->nl4_type) {
4334 case NL4_NETADDR:
4335 addr = &ns->u.nl4_addr;
4336
4337 /* netid_len, netid, uaddr_len, uaddr (port included
4338 * in RPCBIND_MAXUADDRLEN)
4339 */
4340 p = xdr_reserve_space(xdr,
4341 4 /* netid len */ +
4342 (XDR_QUADLEN(addr->netid_len) * 4) +
4343 4 /* uaddr len */ +
4344 (XDR_QUADLEN(addr->addr_len) * 4));
4345 if (!p)
4346 return nfserr_resource;
4347
4348 *p++ = cpu_to_be32(addr->netid_len);
4349 p = xdr_encode_opaque_fixed(p, addr->netid,
4350 addr->netid_len);
4351 *p++ = cpu_to_be32(addr->addr_len);
4352 p = xdr_encode_opaque_fixed(p, addr->addr,
4353 addr->addr_len);
4354 break;
4355 default:
4356 WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR);
4357 return nfserr_inval;
4358 }
4359
4360 return 0;
4361 }
4362
4363 static __be32
4364 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4365 struct nfsd4_copy *copy)
4366 {
4367 __be32 *p;
4368
4369 nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
4370 copy->cp_synchronous);
4371 if (nfserr)
4372 return nfserr;
4373
4374 p = xdr_reserve_space(&resp->xdr, 4 + 4);
4375 *p++ = xdr_one; /* cr_consecutive */
4376 *p++ = cpu_to_be32(copy->cp_synchronous);
4377 return 0;
4378 }
4379
4380 static __be32
4381 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
4382 struct nfsd4_offload_status *os)
4383 {
4384 struct xdr_stream *xdr = &resp->xdr;
4385 __be32 *p;
4386
4387 p = xdr_reserve_space(xdr, 8 + 4);
4388 if (!p)
4389 return nfserr_resource;
4390 p = xdr_encode_hyper(p, os->count);
4391 *p++ = cpu_to_be32(0);
4392
4393 return nfserr;
4394 }
4395
4396 static __be32
4397 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
4398 struct nfsd4_copy_notify *cn)
4399 {
4400 struct xdr_stream *xdr = &resp->xdr;
4401 __be32 *p;
4402
4403 if (nfserr)
4404 return nfserr;
4405
4406 /* 8 sec, 4 nsec */
4407 p = xdr_reserve_space(xdr, 12);
4408 if (!p)
4409 return nfserr_resource;
4410
4411 /* cnr_lease_time */
4412 p = xdr_encode_hyper(p, cn->cpn_sec);
4413 *p++ = cpu_to_be32(cn->cpn_nsec);
4414
4415 /* cnr_stateid */
4416 nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid);
4417 if (nfserr)
4418 return nfserr;
4419
4420 /* cnr_src.nl_nsvr */
4421 p = xdr_reserve_space(xdr, 4);
4422 if (!p)
4423 return nfserr_resource;
4424
4425 *p++ = cpu_to_be32(1);
4426
4427 return nfsd42_encode_nl4_server(resp, &cn->cpn_src);
4428 }
4429
4430 static __be32
4431 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4432 struct nfsd4_seek *seek)
4433 {
4434 __be32 *p;
4435
4436 p = xdr_reserve_space(&resp->xdr, 4 + 8);
4437 *p++ = cpu_to_be32(seek->seek_eof);
4438 p = xdr_encode_hyper(p, seek->seek_pos);
4439
4440 return 0;
4441 }
4442
4443 static __be32
4444 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4445 {
4446 return nfserr;
4447 }
4448
4449 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4450
4451 /*
4452 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4453 * since we don't need to filter out obsolete ops as this is
4454 * done in the decoding phase.
4455 */
4456 static const nfsd4_enc nfsd4_enc_ops[] = {
4457 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
4458 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
4459 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
4460 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
4461 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
4462 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4463 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
4464 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
4465 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
4466 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
4467 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
4468 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
4469 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
4470 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
4471 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4472 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
4473 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
4474 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
4475 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
4476 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
4477 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
4478 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
4479 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
4480 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
4481 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
4482 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
4483 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
4484 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
4485 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
4486 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
4487 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
4488 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
4489 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
4490 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4491 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4492 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
4493 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
4494
4495 /* NFSv4.1 operations */
4496 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
4497 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4498 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
4499 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
4500 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
4501 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
4502 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4503 #ifdef CONFIG_NFSD_PNFS
4504 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4505 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4506 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit,
4507 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget,
4508 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn,
4509 #else
4510 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
4511 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4512 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
4513 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
4514 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4515 #endif
4516 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4517 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
4518 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
4519 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
4520 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4521 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
4522 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
4523
4524 /* NFSv4.2 operations */
4525 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4526 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy,
4527 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_copy_notify,
4528 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4529 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
4530 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
4531 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
4532 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
4533 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_offload_status,
4534 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
4535 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
4536 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
4537 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop,
4538 };
4539
4540 /*
4541 * Calculate whether we still have space to encode repsize bytes.
4542 * There are two considerations:
4543 * - For NFS versions >=4.1, the size of the reply must stay within
4544 * session limits
4545 * - For all NFS versions, we must stay within limited preallocated
4546 * buffer space.
4547 *
4548 * This is called before the operation is processed, so can only provide
4549 * an upper estimate. For some nonidempotent operations (such as
4550 * getattr), it's not necessarily a problem if that estimate is wrong,
4551 * as we can fail it after processing without significant side effects.
4552 */
4553 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4554 {
4555 struct xdr_buf *buf = &resp->rqstp->rq_res;
4556 struct nfsd4_slot *slot = resp->cstate.slot;
4557
4558 if (buf->len + respsize <= buf->buflen)
4559 return nfs_ok;
4560 if (!nfsd4_has_session(&resp->cstate))
4561 return nfserr_resource;
4562 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4563 WARN_ON_ONCE(1);
4564 return nfserr_rep_too_big_to_cache;
4565 }
4566 return nfserr_rep_too_big;
4567 }
4568
4569 void
4570 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4571 {
4572 struct xdr_stream *xdr = &resp->xdr;
4573 struct nfs4_stateowner *so = resp->cstate.replay_owner;
4574 struct svc_rqst *rqstp = resp->rqstp;
4575 const struct nfsd4_operation *opdesc = op->opdesc;
4576 int post_err_offset;
4577 nfsd4_enc encoder;
4578 __be32 *p;
4579
4580 p = xdr_reserve_space(xdr, 8);
4581 if (!p) {
4582 WARN_ON_ONCE(1);
4583 return;
4584 }
4585 *p++ = cpu_to_be32(op->opnum);
4586 post_err_offset = xdr->buf->len;
4587
4588 if (op->opnum == OP_ILLEGAL)
4589 goto status;
4590 if (op->status && opdesc &&
4591 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
4592 goto status;
4593 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4594 !nfsd4_enc_ops[op->opnum]);
4595 encoder = nfsd4_enc_ops[op->opnum];
4596 op->status = encoder(resp, op->status, &op->u);
4597 if (opdesc && opdesc->op_release)
4598 opdesc->op_release(&op->u);
4599 xdr_commit_encode(xdr);
4600
4601 /* nfsd4_check_resp_size guarantees enough room for error status */
4602 if (!op->status) {
4603 int space_needed = 0;
4604 if (!nfsd4_last_compound_op(rqstp))
4605 space_needed = COMPOUND_ERR_SLACK_SPACE;
4606 op->status = nfsd4_check_resp_size(resp, space_needed);
4607 }
4608 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4609 struct nfsd4_slot *slot = resp->cstate.slot;
4610
4611 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4612 op->status = nfserr_rep_too_big_to_cache;
4613 else
4614 op->status = nfserr_rep_too_big;
4615 }
4616 if (op->status == nfserr_resource ||
4617 op->status == nfserr_rep_too_big ||
4618 op->status == nfserr_rep_too_big_to_cache) {
4619 /*
4620 * The operation may have already been encoded or
4621 * partially encoded. No op returns anything additional
4622 * in the case of one of these three errors, so we can
4623 * just truncate back to after the status. But it's a
4624 * bug if we had to do this on a non-idempotent op:
4625 */
4626 warn_on_nonidempotent_op(op);
4627 xdr_truncate_encode(xdr, post_err_offset);
4628 }
4629 if (so) {
4630 int len = xdr->buf->len - post_err_offset;
4631
4632 so->so_replay.rp_status = op->status;
4633 so->so_replay.rp_buflen = len;
4634 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4635 so->so_replay.rp_buf, len);
4636 }
4637 status:
4638 /* Note that op->status is already in network byte order: */
4639 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4640 }
4641
4642 /*
4643 * Encode the reply stored in the stateowner reply cache
4644 *
4645 * XDR note: do not encode rp->rp_buflen: the buffer contains the
4646 * previously sent already encoded operation.
4647 */
4648 void
4649 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4650 {
4651 __be32 *p;
4652 struct nfs4_replay *rp = op->replay;
4653
4654 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4655 if (!p) {
4656 WARN_ON_ONCE(1);
4657 return;
4658 }
4659 *p++ = cpu_to_be32(op->opnum);
4660 *p++ = rp->rp_status; /* already xdr'ed */
4661
4662 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4663 }
4664
4665 int
4666 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4667 {
4668 return xdr_ressize_check(rqstp, p);
4669 }
4670
4671 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4672 {
4673 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4674
4675 if (args->ops != args->iops) {
4676 kfree(args->ops);
4677 args->ops = args->iops;
4678 }
4679 kfree(args->tmpp);
4680 args->tmpp = NULL;
4681 while (args->to_free) {
4682 struct svcxdr_tmpbuf *tb = args->to_free;
4683 args->to_free = tb->next;
4684 kfree(tb);
4685 }
4686 }
4687
4688 int
4689 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4690 {
4691 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4692
4693 if (rqstp->rq_arg.head[0].iov_len % 4) {
4694 /* client is nuts */
4695 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4696 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4697 return 0;
4698 }
4699 args->p = p;
4700 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4701 args->pagelist = rqstp->rq_arg.pages;
4702 args->pagelen = rqstp->rq_arg.page_len;
4703 args->tail = false;
4704 args->tmpp = NULL;
4705 args->to_free = NULL;
4706 args->ops = args->iops;
4707 args->rqstp = rqstp;
4708
4709 return !nfsd4_decode_compound(args);
4710 }
4711
4712 int
4713 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4714 {
4715 /*
4716 * All that remains is to write the tag and operation count...
4717 */
4718 struct nfsd4_compoundres *resp = rqstp->rq_resp;
4719 struct xdr_buf *buf = resp->xdr.buf;
4720
4721 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4722 buf->tail[0].iov_len);
4723
4724 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4725
4726 p = resp->tagp;
4727 *p++ = htonl(resp->taglen);
4728 memcpy(p, resp->tag, resp->taglen);
4729 p += XDR_QUADLEN(resp->taglen);
4730 *p++ = htonl(resp->opcnt);
4731
4732 nfsd4_sequence_done(resp);
4733 return 1;
4734 }
4735
4736 /*
4737 * Local variables:
4738 * c-basic-offset: 8
4739 * End:
4740 */
Ubuntu Jammy Linux kernel mirror