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xattr: remove unused argument
[thirdparty/linux.git] / fs / nfsd / nfs4xdr.c
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1da177e4 1/*
1da177e4
LT		 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.
1da177e4
LT		 34 */
35
96bcad50 36#include <linux/file.h>
5a0e3ad6 37#include <linux/slab.h>
1da177e4 38#include <linux/namei.h>
341eb184 39#include <linux/statfs.h>
0733d213 40#include <linux/utsname.h>
17456804 41#include <linux/pagemap.h>
4796f457 42#include <linux/sunrpc/svcauth_gss.h>
84e1b21d 43#include <linux/sunrpc/addr.h>
23e50fe3 44#include <linux/xattr.h>
80e591ce
CL		 45#include <linux/vmalloc.h>
46
23e50fe3 47#include <uapi/linux/xattr.h>
9a74af21 48
2ca72e17
BF		 49#include "idmap.h"
50#include "acl.h"
9a74af21 51#include "xdr4.h"
0a3adade 52#include "vfs.h"
17456804 53#include "state.h"
1091006c 54#include "cache.h"
3d733711 55#include "netns.h"
9cf514cc 56#include "pnfs.h"
5c4583b2 57#include "filecache.h"
2ca72e17 58
08281341
CL		 59#include "trace.h"
60
18032ca0
DQ		 61#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
62#include <linux/security.h>
63#endif
64
65
1da177e4
LT		 66#define NFSDDBG_FACILITY NFSDDBG_XDR
67
5cf23dbb 68const u32 nfsd_suppattrs[3][3] = {
916d2d84
BF		 69 {NFSD4_SUPPORTED_ATTRS_WORD0,
70 NFSD4_SUPPORTED_ATTRS_WORD1,
71 NFSD4_SUPPORTED_ATTRS_WORD2},
72
73 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
74 NFSD4_1_SUPPORTED_ATTRS_WORD1,
75 NFSD4_1_SUPPORTED_ATTRS_WORD2},
76
77 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
78 NFSD4_1_SUPPORTED_ATTRS_WORD1,
79 NFSD4_2_SUPPORTED_ATTRS_WORD2},
80};
81
42ca0993
BF		 82/*
83 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
84 * directory in order to indicate to the client that a filesystem boundary is present
85 * We use a fixed fsid for a referral
86 */
87#define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
88#define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
89
b37ad28b 90static __be32
a36b1725 91check_filename(char *str, int len)
1da177e4
LT		 92{
93 int i;
94
95 if (len == 0)
96 return nfserr_inval;
000dfa18
CL		 97 if (len > NFS4_MAXNAMLEN)
98 return nfserr_nametoolong;
1da177e4 99 if (isdotent(str, len))
a36b1725 100 return nfserr_badname;
1da177e4
LT		 101 for (i = 0; i < len; i++)
102 if (str[i] == '/')
a36b1725 103 return nfserr_badname;
1da177e4
LT		 104 return 0;
105}
106
60adfc50
AA		 107static int zero_clientid(clientid_t *clid)
108{
109 return (clid->cl_boot == 0) && (clid->cl_id == 0);
110}
111
2d8498db 112/**
d5e23383 113 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
ce043ac8 114 * @argp: NFSv4 compound argument structure
ed992753 115 * @len: length of buffer to allocate
2d8498db 116 *
ed992753
TM		 117 * Allocates a buffer of size @len to be freed when processing the compound
118 * operation described in @argp finishes.
2d8498db 119 */
d5e23383
BF		 120static void *
121svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
1da177e4 122{
d5e23383 123 struct svcxdr_tmpbuf *tb;
1da177e4 124
d5e23383 125 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
1da177e4 126 if (!tb)
d5e23383 127 return NULL;
1da177e4
LT		 128 tb->next = argp->to_free;
129 argp->to_free = tb;
d5e23383 130 return tb->buf;
1da177e4
LT		 131}
132
29c353b3
BF		 133/*
134 * For xdr strings that need to be passed to other kernel api's
135 * as null-terminated strings.
136 *
137 * Note null-terminating in place usually isn't safe since the
138 * buffer might end on a page boundary.
139 */
140static char *
141svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
142{
d5e23383 143 char *p = svcxdr_tmpalloc(argp, len + 1);
29c353b3
BF		 144
145 if (!p)
146 return NULL;
147 memcpy(p, buf, len);
148 p[len] = '\0';
29c353b3 149 return p;
1da177e4
LT		 150}
151
7b723008
CL		 152static void *
153svcxdr_savemem(struct nfsd4_compoundargs *argp, __be32 *p, u32 len)
154{
155 __be32 *tmp;
156
157 /*
158 * The location of the decoded data item is stable,
159 * so @p is OK to use. This is the common case.
160 */
161 if (p != argp->xdr->scratch.iov_base)
162 return p;
163
164 tmp = svcxdr_tmpalloc(argp, len);
165 if (!tmp)
166 return NULL;
167 memcpy(tmp, p, len);
168 return tmp;
169}
170
5dcbfabb
CL		 171/*
172 * NFSv4 basic data type decoders
173 */
174
1a994408
CL		 175/*
176 * This helper handles variable-length opaques which belong to protocol
177 * elements that this implementation does not support.
178 */
179static __be32
180nfsd4_decode_ignored_string(struct nfsd4_compoundargs *argp, u32 maxlen)
181{
182 u32 len;
183
184 if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
185 return nfserr_bad_xdr;
186 if (maxlen && len > maxlen)
187 return nfserr_bad_xdr;
188 if (!xdr_inline_decode(argp->xdr, len))
189 return nfserr_bad_xdr;
190
191 return nfs_ok;
192}
193
5dcbfabb
CL		 194static __be32
195nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
196{
197 __be32 *p;
198 u32 len;
199
200 if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
201 return nfserr_bad_xdr;
202 if (len == 0 || len > NFS4_OPAQUE_LIMIT)
203 return nfserr_bad_xdr;
204 p = xdr_inline_decode(argp->xdr, len);
205 if (!p)
206 return nfserr_bad_xdr;
7b723008 207 o->data = svcxdr_savemem(argp, p, len);
5dcbfabb
CL		 208 if (!o->data)
209 return nfserr_jukebox;
210 o->len = len;
5dcbfabb
CL		 211
212 return nfs_ok;
213}
214
000dfa18
CL		 215static __be32
216nfsd4_decode_component4(struct nfsd4_compoundargs *argp, char **namp, u32 *lenp)
217{
218 __be32 *p, status;
219
220 if (xdr_stream_decode_u32(argp->xdr, lenp) < 0)
221 return nfserr_bad_xdr;
222 p = xdr_inline_decode(argp->xdr, *lenp);
223 if (!p)
224 return nfserr_bad_xdr;
225 status = check_filename((char *)p, *lenp);
226 if (status)
227 return status;
7b723008 228 *namp = svcxdr_savemem(argp, p, *lenp);
000dfa18
CL		 229 if (!*namp)
230 return nfserr_jukebox;
000dfa18
CL		 231
232 return nfs_ok;
233}
234
1c3eff7e
CL		 235static __be32
236nfsd4_decode_nfstime4(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
237{
238 __be32 *p;
239
240 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 3);
241 if (!p)
242 return nfserr_bad_xdr;
243 p = xdr_decode_hyper(p, &tv->tv_sec);
244 tv->tv_nsec = be32_to_cpup(p++);
245 if (tv->tv_nsec >= (u32)1000000000)
246 return nfserr_inval;
247 return nfs_ok;
248}
249
796dd1c6
CL		 250static __be32
251nfsd4_decode_verifier4(struct nfsd4_compoundargs *argp, nfs4_verifier *verf)
252{
253 __be32 *p;
254
255 p = xdr_inline_decode(argp->xdr, NFS4_VERIFIER_SIZE);
256 if (!p)
257 return nfserr_bad_xdr;
258 memcpy(verf->data, p, sizeof(verf->data));
259 return nfs_ok;
260}
261
d1c263a0
CL		 262/**
263 * nfsd4_decode_bitmap4 - Decode an NFSv4 bitmap4
264 * @argp: NFSv4 compound argument structure
265 * @bmval: pointer to an array of u32's to decode into
266 * @bmlen: size of the @bmval array
267 *
268 * The server needs to return nfs_ok rather than nfserr_bad_xdr when
269 * encountering bitmaps containing bits it does not recognize. This
270 * includes bits in bitmap words past WORDn, where WORDn is the last
271 * bitmap WORD the implementation currently supports. Thus we are
272 * careful here to simply ignore bits in bitmap words that this
273 * implementation has yet to support explicitly.
274 *
275 * Return values:
276 * %nfs_ok: @bmval populated successfully
277 * %nfserr_bad_xdr: the encoded bitmap was invalid
278 */
279static __be32
280nfsd4_decode_bitmap4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen)
281{
cd2e999c 282 ssize_t status;
d1c263a0 283
cd2e999c
CL		 284 status = xdr_stream_decode_uint32_array(argp->xdr, bmval, bmlen);
285 return status == -EBADMSG ? nfserr_bad_xdr : nfs_ok;
d1c263a0
CL		 286}
287
c941a968
CL		 288static __be32
289nfsd4_decode_nfsace4(struct nfsd4_compoundargs *argp, struct nfs4_ace *ace)
290{
291 __be32 *p, status;
292 u32 length;
293
294 if (xdr_stream_decode_u32(argp->xdr, &ace->type) < 0)
295 return nfserr_bad_xdr;
296 if (xdr_stream_decode_u32(argp->xdr, &ace->flag) < 0)
297 return nfserr_bad_xdr;
298 if (xdr_stream_decode_u32(argp->xdr, &ace->access_mask) < 0)
299 return nfserr_bad_xdr;
300
301 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
302 return nfserr_bad_xdr;
303 p = xdr_inline_decode(argp->xdr, length);
304 if (!p)
305 return nfserr_bad_xdr;
306 ace->whotype = nfs4_acl_get_whotype((char *)p, length);
307 if (ace->whotype != NFS4_ACL_WHO_NAMED)
308 status = nfs_ok;
309 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
310 status = nfsd_map_name_to_gid(argp->rqstp,
311 (char *)p, length, &ace->who_gid);
312 else
313 status = nfsd_map_name_to_uid(argp->rqstp,
314 (char *)p, length, &ace->who_uid);
315
316 return status;
317}
318
319/* A counted array of nfsace4's */
320static noinline __be32
321nfsd4_decode_acl(struct nfsd4_compoundargs *argp, struct nfs4_acl **acl)
322{
323 struct nfs4_ace *ace;
324 __be32 status;
325 u32 count;
326
327 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
328 return nfserr_bad_xdr;
329
330 if (count > xdr_stream_remaining(argp->xdr) / 20)
331 /*
332 * Even with 4-byte names there wouldn't be
333 * space for that many aces; something fishy is
334 * going on:
335 */
336 return nfserr_fbig;
337
338 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(count));
339 if (*acl == NULL)
340 return nfserr_jukebox;
341
342 (*acl)->naces = count;
343 for (ace = (*acl)->aces; ace < (*acl)->aces + count; ace++) {
344 status = nfsd4_decode_nfsace4(argp, ace);
345 if (status)
346 return status;
347 }
348
349 return nfs_ok;
350}
351
dabe9182
CL		 352static noinline __be32
353nfsd4_decode_security_label(struct nfsd4_compoundargs *argp,
354 struct xdr_netobj *label)
355{
356 u32 lfs, pi, length;
357 __be32 *p;
358
359 if (xdr_stream_decode_u32(argp->xdr, &lfs) < 0)
360 return nfserr_bad_xdr;
361 if (xdr_stream_decode_u32(argp->xdr, &pi) < 0)
362 return nfserr_bad_xdr;
363
364 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
365 return nfserr_bad_xdr;
366 if (length > NFS4_MAXLABELLEN)
367 return nfserr_badlabel;
368 p = xdr_inline_decode(argp->xdr, length);
369 if (!p)
370 return nfserr_bad_xdr;
371 label->len = length;
372 label->data = svcxdr_dupstr(argp, p, length);
373 if (!label->data)
374 return nfserr_jukebox;
375
376 return nfs_ok;
377}
378
b37ad28b 379static __be32
d1c263a0
CL		 380nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen,
381 struct iattr *iattr, struct nfs4_acl **acl,
382 struct xdr_netobj *label, int *umask)
1da177e4 383{
081d53fe
CL		 384 unsigned int starting_pos;
385 u32 attrlist4_count;
d1c263a0 386 __be32 *p, status;
1da177e4 387
1da177e4 388 iattr->ia_valid = 0;
d1c263a0
CL		 389 status = nfsd4_decode_bitmap4(argp, bmval, bmlen);
390 if (status)
391 return nfserr_bad_xdr;
1da177e4 392
e864c189
BF		 393 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
394 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
395 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
396 if (nfsd_attrs_supported(argp->minorversion, bmval))
397 return nfserr_inval;
398 return nfserr_attrnotsupp;
399 }
400
081d53fe
CL		 401 if (xdr_stream_decode_u32(argp->xdr, &attrlist4_count) < 0)
402 return nfserr_bad_xdr;
403 starting_pos = xdr_stream_pos(argp->xdr);
1da177e4
LT		 404
405 if (bmval[0] & FATTR4_WORD0_SIZE) {
2ac1b9b2
CL		 406 u64 size;
407
408 if (xdr_stream_decode_u64(argp->xdr, &size) < 0)
409 return nfserr_bad_xdr;
410 iattr->ia_size = size;
1da177e4
LT		 411 iattr->ia_valid |= ATTR_SIZE;
412 }
413 if (bmval[0] & FATTR4_WORD0_ACL) {
c941a968
CL		 414 status = nfsd4_decode_acl(argp, acl);
415 if (status)
416 return status;
1da177e4
LT		 417 } else
418 *acl = NULL;
419 if (bmval[1] & FATTR4_WORD1_MODE) {
1c8f0ad7
CL		 420 u32 mode;
421
422 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
423 return nfserr_bad_xdr;
424 iattr->ia_mode = mode;
1da177e4
LT		 425 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
426 iattr->ia_valid |= ATTR_MODE;
427 }
428 if (bmval[1] & FATTR4_WORD1_OWNER) {
9853a5ac
CL		 429 u32 length;
430
431 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
432 return nfserr_bad_xdr;
433 p = xdr_inline_decode(argp->xdr, length);
434 if (!p)
435 return nfserr_bad_xdr;
436 status = nfsd_map_name_to_uid(argp->rqstp, (char *)p, length,
437 &iattr->ia_uid);
438 if (status)
47c85291 439 return status;
1da177e4
LT		 440 iattr->ia_valid |= ATTR_UID;
441 }
442 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
393c31dd
CL		 443 u32 length;
444
445 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
446 return nfserr_bad_xdr;
447 p = xdr_inline_decode(argp->xdr, length);
448 if (!p)
449 return nfserr_bad_xdr;
450 status = nfsd_map_name_to_gid(argp->rqstp, (char *)p, length,
451 &iattr->ia_gid);
452 if (status)
47c85291 453 return status;
1da177e4
LT		 454 iattr->ia_valid |= ATTR_GID;
455 }
456 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
1c3eff7e
CL		 457 u32 set_it;
458
459 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
460 return nfserr_bad_xdr;
461 switch (set_it) {
1da177e4 462 case NFS4_SET_TO_CLIENT_TIME:
1c3eff7e 463 status = nfsd4_decode_nfstime4(argp, &iattr->ia_atime);
4c94e13e
CH		 464 if (status)
465 return status;
1da177e4
LT		 466 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
467 break;
468 case NFS4_SET_TO_SERVER_TIME:
469 iattr->ia_valid |= ATTR_ATIME;
470 break;
471 default:
1c3eff7e 472 return nfserr_bad_xdr;
1da177e4
LT		 473 }
474 }
5b2f3e07
CL		 475 if (bmval[1] & FATTR4_WORD1_TIME_CREATE) {
476 struct timespec64 ts;
477
478 /* No Linux filesystem supports setting this attribute. */
479 bmval[1] &= ~FATTR4_WORD1_TIME_CREATE;
480 status = nfsd4_decode_nfstime4(argp, &ts);
481 if (status)
482 return status;
483 }
1da177e4 484 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
1c3eff7e
CL		 485 u32 set_it;
486
487 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
488 return nfserr_bad_xdr;
489 switch (set_it) {
1da177e4 490 case NFS4_SET_TO_CLIENT_TIME:
1c3eff7e 491 status = nfsd4_decode_nfstime4(argp, &iattr->ia_mtime);
4c94e13e
CH		 492 if (status)
493 return status;
1da177e4
LT		 494 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
495 break;
496 case NFS4_SET_TO_SERVER_TIME:
497 iattr->ia_valid |= ATTR_MTIME;
498 break;
499 default:
1c3eff7e 500 return nfserr_bad_xdr;
1da177e4
LT		 501 }
502 }
18032ca0 503 label->len = 0;
2285ae76
AB		 504 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
505 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
dabe9182
CL		 506 status = nfsd4_decode_security_label(argp, label);
507 if (status)
508 return status;
18032ca0 509 }
47057abd 510 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
66f0476c
CL		 511 u32 mode, mask;
512
47057abd 513 if (!umask)
66f0476c
CL		 514 return nfserr_bad_xdr;
515 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
516 return nfserr_bad_xdr;
517 iattr->ia_mode = mode & (S_IFMT | S_IALLUGO);
518 if (xdr_stream_decode_u32(argp->xdr, &mask) < 0)
519 return nfserr_bad_xdr;
520 *umask = mask & S_IRWXUGO;
47057abd
AG		 521 iattr->ia_valid |= ATTR_MODE;
522 }
081d53fe
CL		 523
524 /* request sanity: did attrlist4 contain the expected number of words? */
525 if (attrlist4_count != xdr_stream_pos(argp->xdr) - starting_pos)
526 return nfserr_bad_xdr;
1da177e4 527
d1c263a0 528 return nfs_ok;
1da177e4
LT		 529}
530
d3d2f381
CL		 531static __be32
532nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid)
533{
534 __be32 *p;
535
536 p = xdr_inline_decode(argp->xdr, NFS4_STATEID_SIZE);
537 if (!p)
538 return nfserr_bad_xdr;
539 sid->si_generation = be32_to_cpup(p++);
540 memcpy(&sid->si_opaque, p, sizeof(sid->si_opaque));
541 return nfs_ok;
542}
543
144e8269
CL		 544static __be32
545nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp, clientid_t *clientid)
546{
547 __be32 *p;
548
549 p = xdr_inline_decode(argp->xdr, sizeof(__be64));
550 if (!p)
551 return nfserr_bad_xdr;
552 memcpy(clientid, p, sizeof(*clientid));
553 return nfs_ok;
554}
555
556static __be32
557nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp,
558 clientid_t *clientid, struct xdr_netobj *owner)
559{
560 __be32 status;
561
562 status = nfsd4_decode_clientid4(argp, clientid);
563 if (status)
564 return status;
565 return nfsd4_decode_opaque(argp, owner);
566}
567
04495971
CL		 568#ifdef CONFIG_NFSD_PNFS
569static __be32
570nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp,
571 struct nfsd4_deviceid *devid)
572{
573 __be32 *p;
574
575 p = xdr_inline_decode(argp->xdr, NFS4_DEVICEID4_SIZE);
576 if (!p)
577 return nfserr_bad_xdr;
578 memcpy(devid, p, sizeof(*devid));
579 return nfs_ok;
580}
5185980d
CL		 581
582static __be32
583nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs *argp,
584 struct nfsd4_layoutcommit *lcp)
585{
586 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_layout_type) < 0)
587 return nfserr_bad_xdr;
588 if (lcp->lc_layout_type < LAYOUT_NFSV4_1_FILES)
589 return nfserr_bad_xdr;
590 if (lcp->lc_layout_type >= LAYOUT_TYPE_MAX)
591 return nfserr_bad_xdr;
592
593 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_up_len) < 0)
594 return nfserr_bad_xdr;
595 if (lcp->lc_up_len > 0) {
596 lcp->lc_up_layout = xdr_inline_decode(argp->xdr, lcp->lc_up_len);
597 if (!lcp->lc_up_layout)
598 return nfserr_bad_xdr;
599 }
600
601 return nfs_ok;
602}
603
645fcad3
CL		 604static __be32
605nfsd4_decode_layoutreturn4(struct nfsd4_compoundargs *argp,
606 struct nfsd4_layoutreturn *lrp)
607{
608 __be32 status;
609
610 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_return_type) < 0)
611 return nfserr_bad_xdr;
612 switch (lrp->lr_return_type) {
613 case RETURN_FILE:
614 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.offset) < 0)
615 return nfserr_bad_xdr;
616 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.length) < 0)
617 return nfserr_bad_xdr;
618 status = nfsd4_decode_stateid4(argp, &lrp->lr_sid);
619 if (status)
620 return status;
621 if (xdr_stream_decode_u32(argp->xdr, &lrp->lrf_body_len) < 0)
622 return nfserr_bad_xdr;
623 if (lrp->lrf_body_len > 0) {
624 lrp->lrf_body = xdr_inline_decode(argp->xdr, lrp->lrf_body_len);
625 if (!lrp->lrf_body)
626 return nfserr_bad_xdr;
627 }
628 break;
629 case RETURN_FSID:
630 case RETURN_ALL:
631 lrp->lr_seg.offset = 0;
632 lrp->lr_seg.length = NFS4_MAX_UINT64;
633 break;
634 default:
635 return nfserr_bad_xdr;
636 }
637
638 return nfs_ok;
639}
640
04495971
CL		 641#endif /* CONFIG_NFSD_PNFS */
642
571e0451
CL		 643static __be32
644nfsd4_decode_sessionid4(struct nfsd4_compoundargs *argp,
645 struct nfs4_sessionid *sessionid)
646{
647 __be32 *p;
648
649 p = xdr_inline_decode(argp->xdr, NFS4_MAX_SESSIONID_LEN);
650 if (!p)
651 return nfserr_bad_xdr;
652 memcpy(sessionid->data, p, sizeof(sessionid->data));
653 return nfs_ok;
654}
655
1a994408
CL		 656/* Defined in Appendix A of RFC 5531 */
657static __be32
658nfsd4_decode_authsys_parms(struct nfsd4_compoundargs *argp,
659 struct nfsd4_cb_sec *cbs)
acb2887e 660{
1a994408
CL		 661 u32 stamp, gidcount, uid, gid;
662 __be32 *p, status;
663
664 if (xdr_stream_decode_u32(argp->xdr, &stamp) < 0)
665 return nfserr_bad_xdr;
666 /* machine name */
667 status = nfsd4_decode_ignored_string(argp, 255);
668 if (status)
669 return status;
670 if (xdr_stream_decode_u32(argp->xdr, &uid) < 0)
671 return nfserr_bad_xdr;
672 if (xdr_stream_decode_u32(argp->xdr, &gid) < 0)
673 return nfserr_bad_xdr;
674 if (xdr_stream_decode_u32(argp->xdr, &gidcount) < 0)
675 return nfserr_bad_xdr;
676 if (gidcount > 16)
677 return nfserr_bad_xdr;
678 p = xdr_inline_decode(argp->xdr, gidcount << 2);
679 if (!p)
680 return nfserr_bad_xdr;
681 if (cbs->flavor == (u32)(-1)) {
682 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
683
684 kuid_t kuid = make_kuid(userns, uid);
685 kgid_t kgid = make_kgid(userns, gid);
686 if (uid_valid(kuid) && gid_valid(kgid)) {
687 cbs->uid = kuid;
688 cbs->gid = kgid;
689 cbs->flavor = RPC_AUTH_UNIX;
690 } else {
691 dprintk("RPC_AUTH_UNIX with invalid uid or gid, ignoring!\n");
692 }
693 }
694
695 return nfs_ok;
696}
697
698static __be32
699nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs *argp,
700 struct nfsd4_cb_sec *cbs)
701{
702 __be32 status;
703 u32 service;
704
705 dprintk("RPC_AUTH_GSS callback secflavor not supported!\n");
706
707 if (xdr_stream_decode_u32(argp->xdr, &service) < 0)
708 return nfserr_bad_xdr;
709 if (service < RPC_GSS_SVC_NONE || service > RPC_GSS_SVC_PRIVACY)
710 return nfserr_bad_xdr;
711 /* gcbp_handle_from_server */
712 status = nfsd4_decode_ignored_string(argp, 0);
713 if (status)
714 return status;
715 /* gcbp_handle_from_client */
716 status = nfsd4_decode_ignored_string(argp, 0);
717 if (status)
718 return status;
719
720 return nfs_ok;
721}
722
723/* a counted array of callback_sec_parms4 items */
724static __be32
725nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
726{
727 u32 i, secflavor, nr_secflavs;
728 __be32 status;
acb2887e
BF		 729
730 /* callback_sec_params4 */
1a994408
CL		 731 if (xdr_stream_decode_u32(argp->xdr, &nr_secflavs) < 0)
732 return nfserr_bad_xdr;
57569a70
BF		 733 if (nr_secflavs)
734 cbs->flavor = (u32)(-1);
735 else
736 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
737 cbs->flavor = 0;
1a994408 738
acb2887e 739 for (i = 0; i < nr_secflavs; ++i) {
1a994408
CL		 740 if (xdr_stream_decode_u32(argp->xdr, &secflavor) < 0)
741 return nfserr_bad_xdr;
742 switch (secflavor) {
acb2887e 743 case RPC_AUTH_NULL:
1a994408 744 /* void */
12fc3e92
BF		 745 if (cbs->flavor == (u32)(-1))
746 cbs->flavor = RPC_AUTH_NULL;
acb2887e
BF		 747 break;
748 case RPC_AUTH_UNIX:
1a994408
CL		 749 status = nfsd4_decode_authsys_parms(argp, cbs);
750 if (status)
751 return status;
acb2887e
BF		 752 break;
753 case RPC_AUTH_GSS:
1a994408
CL		 754 status = nfsd4_decode_gss_cb_handles4(argp, cbs);
755 if (status)
756 return status;
acb2887e
BF		 757 break;
758 default:
acb2887e
BF		 759 return nfserr_inval;
760 }
761 }
1a994408
CL		 762
763 return nfs_ok;
acb2887e
BF		 764}
765
1a994408 766
d169a6a9
CL		 767/*
768 * NFSv4 operation argument decoders
769 */
770
771static __be32
772nfsd4_decode_access(struct nfsd4_compoundargs *argp,
e78e274e 773 union nfsd4_op_u *u)
d169a6a9 774{
e78e274e 775 struct nfsd4_access *access = &u->access;
d169a6a9
CL		 776 if (xdr_stream_decode_u32(argp->xdr, &access->ac_req_access) < 0)
777 return nfserr_bad_xdr;
778 return nfs_ok;
779}
780
b37ad28b 781static __be32
e78e274e 782nfsd4_decode_close(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 783{
e78e274e 784 struct nfsd4_close *close = &u->close;
d3d2f381
CL		 785 if (xdr_stream_decode_u32(argp->xdr, &close->cl_seqid) < 0)
786 return nfserr_bad_xdr;
787 return nfsd4_decode_stateid4(argp, &close->cl_stateid);
1da177e4
LT		 788}
789
790
b37ad28b 791static __be32
e78e274e 792nfsd4_decode_commit(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 793{
e78e274e 794 struct nfsd4_commit *commit = &u->commit;
cbd9abb3
CL		 795 if (xdr_stream_decode_u64(argp->xdr, &commit->co_offset) < 0)
796 return nfserr_bad_xdr;
797 if (xdr_stream_decode_u32(argp->xdr, &commit->co_count) < 0)
798 return nfserr_bad_xdr;
3fdc5464 799 memset(&commit->co_verf, 0, sizeof(commit->co_verf));
cbd9abb3 800 return nfs_ok;
1da177e4
LT		 801}
802
b37ad28b 803static __be32
e78e274e 804nfsd4_decode_create(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 805{
e78e274e 806 struct nfsd4_create *create = &u->create;
000dfa18 807 __be32 *p, status;
1da177e4 808
3fdc5464 809 memset(create, 0, sizeof(*create));
000dfa18
CL		 810 if (xdr_stream_decode_u32(argp->xdr, &create->cr_type) < 0)
811 return nfserr_bad_xdr;
1da177e4
LT		 812 switch (create->cr_type) {
813 case NF4LNK:
000dfa18
CL		 814 if (xdr_stream_decode_u32(argp->xdr, &create->cr_datalen) < 0)
815 return nfserr_bad_xdr;
816 p = xdr_inline_decode(argp->xdr, create->cr_datalen);
817 if (!p)
818 return nfserr_bad_xdr;
29c353b3 819 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
7fb84306 820 if (!create->cr_data)
76f47128 821 return nfserr_jukebox;
1da177e4
LT		 822 break;
823 case NF4BLK:
824 case NF4CHR:
000dfa18
CL		 825 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata1) < 0)
826 return nfserr_bad_xdr;
827 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata2) < 0)
828 return nfserr_bad_xdr;
1da177e4
LT		 829 break;
830 case NF4SOCK:
831 case NF4FIFO:
832 case NF4DIR:
833 default:
834 break;
835 }
000dfa18
CL		 836 status = nfsd4_decode_component4(argp, &create->cr_name,
837 &create->cr_namelen);
838 if (status)
1da177e4 839 return status;
d1c263a0
CL		 840 status = nfsd4_decode_fattr4(argp, create->cr_bmval,
841 ARRAY_SIZE(create->cr_bmval),
842 &create->cr_iattr, &create->cr_acl,
843 &create->cr_label, &create->cr_umask);
c0d6fc8a 844 if (status)
000dfa18 845 return status;
1da177e4 846
000dfa18 847 return nfs_ok;
1da177e4
LT		 848}
849
b37ad28b 850static inline __be32
e78e274e 851nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 852{
e78e274e 853 struct nfsd4_delegreturn *dr = &u->delegreturn;
95e6482c 854 return nfsd4_decode_stateid4(argp, &dr->dr_stateid);
1da177e4
LT		 855}
856
b37ad28b 857static inline __be32
e78e274e 858nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 859{
e78e274e 860 struct nfsd4_getattr *getattr = &u->getattr;
3fdc5464 861 memset(getattr, 0, sizeof(*getattr));
f759eff2
CL		 862 return nfsd4_decode_bitmap4(argp, getattr->ga_bmval,
863 ARRAY_SIZE(getattr->ga_bmval));
1da177e4
LT		 864}
865
b37ad28b 866static __be32
e78e274e 867nfsd4_decode_link(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 868{
e78e274e 869 struct nfsd4_link *link = &u->link;
3fdc5464 870 memset(link, 0, sizeof(*link));
5c505d12 871 return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen);
1da177e4
LT		 872}
873
8918cc0d
CL		 874static __be32
875nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp,
876 struct nfsd4_lock *lock)
877{
878 __be32 status;
879
880 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0)
881 return nfserr_bad_xdr;
882 status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid);
883 if (status)
884 return status;
885 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0)
886 return nfserr_bad_xdr;
887 return nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid,
888 &lock->lk_new_owner);
889}
890
891static __be32
892nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp,
893 struct nfsd4_lock *lock)
894{
895 __be32 status;
896
897 status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid);
898 if (status)
899 return status;
900 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0)
901 return nfserr_bad_xdr;
902
903 return nfs_ok;
904}
905
906static __be32
907nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
908{
909 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_is_new) < 0)
910 return nfserr_bad_xdr;
911 if (lock->lk_is_new)
912 return nfsd4_decode_open_to_lock_owner4(argp, lock);
913 return nfsd4_decode_exist_lock_owner4(argp, lock);
914}
915
b37ad28b 916static __be32
e78e274e 917nfsd4_decode_lock(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 918{
e78e274e 919 struct nfsd4_lock *lock = &u->lock;
3fdc5464 920 memset(lock, 0, sizeof(*lock));
7c59deed
CL		 921 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_type) < 0)
922 return nfserr_bad_xdr;
1da177e4 923 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
7c59deed
CL		 924 return nfserr_bad_xdr;
925 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_reclaim) < 0)
926 return nfserr_bad_xdr;
927 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_offset) < 0)
928 return nfserr_bad_xdr;
929 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_length) < 0)
930 return nfserr_bad_xdr;
931 return nfsd4_decode_locker4(argp, lock);
1da177e4
LT		 932}
933
b37ad28b 934static __be32
e78e274e 935nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 936{
e78e274e 937 struct nfsd4_lockt *lockt = &u->lockt;
3fdc5464 938 memset(lockt, 0, sizeof(*lockt));
0a146f04
CL		 939 if (xdr_stream_decode_u32(argp->xdr, &lockt->lt_type) < 0)
940 return nfserr_bad_xdr;
941 if ((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
942 return nfserr_bad_xdr;
943 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_offset) < 0)
944 return nfserr_bad_xdr;
945 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_length) < 0)
946 return nfserr_bad_xdr;
947 return nfsd4_decode_state_owner4(argp, &lockt->lt_clientid,
948 &lockt->lt_owner);
1da177e4
LT		 949}
950
b37ad28b 951static __be32
e78e274e 952nfsd4_decode_locku(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 953{
e78e274e 954 struct nfsd4_locku *locku = &u->locku;
ca9cf9fc 955 __be32 status;
1da177e4 956
ca9cf9fc
CL		 957 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_type) < 0)
958 return nfserr_bad_xdr;
1da177e4 959 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
ca9cf9fc
CL		 960 return nfserr_bad_xdr;
961 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_seqid) < 0)
962 return nfserr_bad_xdr;
963 status = nfsd4_decode_stateid4(argp, &locku->lu_stateid);
e31a1b66
BH		 964 if (status)
965 return status;
ca9cf9fc
CL		 966 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_offset) < 0)
967 return nfserr_bad_xdr;
968 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_length) < 0)
969 return nfserr_bad_xdr;
1da177e4 970
ca9cf9fc 971 return nfs_ok;
1da177e4
LT		 972}
973
b37ad28b 974static __be32
e78e274e 975nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 976{
e78e274e 977 struct nfsd4_lookup *lookup = &u->lookup;
3d5877e8 978 return nfsd4_decode_component4(argp, &lookup->lo_name, &lookup->lo_len);
1da177e4
LT		 979}
980
bf33bab3
CL		 981static __be32
982nfsd4_decode_createhow4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
983{
984 __be32 status;
985
986 if (xdr_stream_decode_u32(argp->xdr, &open->op_createmode) < 0)
987 return nfserr_bad_xdr;
988 switch (open->op_createmode) {
989 case NFS4_CREATE_UNCHECKED:
990 case NFS4_CREATE_GUARDED:
991 status = nfsd4_decode_fattr4(argp, open->op_bmval,
992 ARRAY_SIZE(open->op_bmval),
993 &open->op_iattr, &open->op_acl,
994 &open->op_label, &open->op_umask);
995 if (status)
996 return status;
997 break;
998 case NFS4_CREATE_EXCLUSIVE:
999 status = nfsd4_decode_verifier4(argp, &open->op_verf);
1000 if (status)
1001 return status;
1002 break;
1003 case NFS4_CREATE_EXCLUSIVE4_1:
1004 if (argp->minorversion < 1)
1005 return nfserr_bad_xdr;
1006 status = nfsd4_decode_verifier4(argp, &open->op_verf);
1007 if (status)
1008 return status;
1009 status = nfsd4_decode_fattr4(argp, open->op_bmval,
1010 ARRAY_SIZE(open->op_bmval),
1011 &open->op_iattr, &open->op_acl,
1012 &open->op_label, &open->op_umask);
1013 if (status)
1014 return status;
1015 break;
1016 default:
1017 return nfserr_bad_xdr;
1018 }
1019
1020 return nfs_ok;
1021}
1022
e6ec04b2
CL		 1023static __be32
1024nfsd4_decode_openflag4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
1025{
1026 __be32 status;
1027
1028 if (xdr_stream_decode_u32(argp->xdr, &open->op_create) < 0)
1029 return nfserr_bad_xdr;
1030 switch (open->op_create) {
1031 case NFS4_OPEN_NOCREATE:
1032 break;
1033 case NFS4_OPEN_CREATE:
1034 status = nfsd4_decode_createhow4(argp, open);
1035 if (status)
1036 return status;
1037 break;
1038 default:
1039 return nfserr_bad_xdr;
1040 }
1041
1042 return nfs_ok;
1043}
1044
2c8bd7e0 1045static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
04f9e664 1046{
04f9e664
BF		 1047 u32 w;
1048
9aa62f51
CL		 1049 if (xdr_stream_decode_u32(argp->xdr, &w) < 0)
1050 return nfserr_bad_xdr;
2c8bd7e0
BH		 1051 *share_access = w & NFS4_SHARE_ACCESS_MASK;
1052 *deleg_want = w & NFS4_SHARE_WANT_MASK;
1053 if (deleg_when)
1054 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
1055
04f9e664
BF		 1056 switch (w & NFS4_SHARE_ACCESS_MASK) {
1057 case NFS4_SHARE_ACCESS_READ:
1058 case NFS4_SHARE_ACCESS_WRITE:
1059 case NFS4_SHARE_ACCESS_BOTH:
1060 break;
1061 default:
1062 return nfserr_bad_xdr;
1063 }
fc0d14fe 1064 w &= ~NFS4_SHARE_ACCESS_MASK;
04f9e664
BF		 1065 if (!w)
1066 return nfs_ok;
1067 if (!argp->minorversion)
1068 return nfserr_bad_xdr;
1069 switch (w & NFS4_SHARE_WANT_MASK) {
1070 case NFS4_SHARE_WANT_NO_PREFERENCE:
1071 case NFS4_SHARE_WANT_READ_DELEG:
1072 case NFS4_SHARE_WANT_WRITE_DELEG:
1073 case NFS4_SHARE_WANT_ANY_DELEG:
1074 case NFS4_SHARE_WANT_NO_DELEG:
1075 case NFS4_SHARE_WANT_CANCEL:
1076 break;
1077 default:
1078 return nfserr_bad_xdr;
1079 }
92bac8c5 1080 w &= ~NFS4_SHARE_WANT_MASK;
04f9e664
BF		 1081 if (!w)
1082 return nfs_ok;
2c8bd7e0
BH		 1083
1084 if (!deleg_when) /* open_downgrade */
1085 return nfserr_inval;
04f9e664
BF		 1086 switch (w) {
1087 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
1088 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
c668fc6d
BH		 1089 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
1090 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
04f9e664
BF		 1091 return nfs_ok;
1092 }
04f9e664
BF		 1093 return nfserr_bad_xdr;
1094}
1095
1096static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
1097{
b07bebd9
CL		 1098 if (xdr_stream_decode_u32(argp->xdr, x) < 0)
1099 return nfserr_bad_xdr;
1100 /* Note: unlike access bits, deny bits may be zero. */
01cd4afa 1101 if (*x & ~NFS4_SHARE_DENY_BOTH)
04f9e664 1102 return nfserr_bad_xdr;
b07bebd9 1103
04f9e664 1104 return nfs_ok;
04f9e664
BF		 1105}
1106
1708e50b
CL		 1107static __be32
1108nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp,
1109 struct nfsd4_open *open)
1110{
1111 __be32 status;
1112
1113 if (xdr_stream_decode_u32(argp->xdr, &open->op_claim_type) < 0)
1114 return nfserr_bad_xdr;
1115 switch (open->op_claim_type) {
1116 case NFS4_OPEN_CLAIM_NULL:
1117 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1118 status = nfsd4_decode_component4(argp, &open->op_fname,
1119 &open->op_fnamelen);
1120 if (status)
1121 return status;
1122 break;
1123 case NFS4_OPEN_CLAIM_PREVIOUS:
1124 if (xdr_stream_decode_u32(argp->xdr, &open->op_delegate_type) < 0)
1125 return nfserr_bad_xdr;
1126 break;
1127 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1128 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1129 if (status)
1130 return status;
1131 status = nfsd4_decode_component4(argp, &open->op_fname,
1132 &open->op_fnamelen);
1133 if (status)
1134 return status;
1135 break;
1136 case NFS4_OPEN_CLAIM_FH:
1137 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1138 if (argp->minorversion < 1)
1139 return nfserr_bad_xdr;
1140 /* void */
1141 break;
1142 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1143 if (argp->minorversion < 1)
1144 return nfserr_bad_xdr;
1145 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1146 if (status)
1147 return status;
1148 break;
1149 default:
1150 return nfserr_bad_xdr;
1151 }
1152
1153 return nfs_ok;
1154}
1155
b37ad28b 1156static __be32
e78e274e 1157nfsd4_decode_open(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 1158{
e78e274e 1159 struct nfsd4_open *open = &u->open;
61e5e0b3 1160 __be32 status;
2c8bd7e0 1161 u32 dummy;
1da177e4 1162
3fdc5464 1163 memset(open, 0, sizeof(*open));
1da177e4 1164
61e5e0b3
CL		 1165 if (xdr_stream_decode_u32(argp->xdr, &open->op_seqid) < 0)
1166 return nfserr_bad_xdr;
1167 /* deleg_want is ignored */
2c8bd7e0
BH		 1168 status = nfsd4_decode_share_access(argp, &open->op_share_access,
1169 &open->op_deleg_want, &dummy);
04f9e664 1170 if (status)
61e5e0b3 1171 return status;
04f9e664
BF		 1172 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
1173 if (status)
61e5e0b3
CL		 1174 return status;
1175 status = nfsd4_decode_state_owner4(argp, &open->op_clientid,
1176 &open->op_owner);
a084daf5 1177 if (status)
61e5e0b3 1178 return status;
e6ec04b2
CL		 1179 status = nfsd4_decode_openflag4(argp, open);
1180 if (status)
1181 return status;
61e5e0b3 1182 return nfsd4_decode_open_claim4(argp, open);
1da177e4
LT		 1183}
1184
b37ad28b 1185static __be32
e78e274e
KC		 1186nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp,
1187 union nfsd4_op_u *u)
1da177e4 1188{
e78e274e 1189 struct nfsd4_open_confirm *open_conf = &u->open_confirm;
06bee693 1190 __be32 status;
e1a90ebd
AS		 1191
1192 if (argp->minorversion >= 1)
1193 return nfserr_notsupp;
1194
06bee693 1195 status = nfsd4_decode_stateid4(argp, &open_conf->oc_req_stateid);
e31a1b66
BH		 1196 if (status)
1197 return status;
06bee693
CL		 1198 if (xdr_stream_decode_u32(argp->xdr, &open_conf->oc_seqid) < 0)
1199 return nfserr_bad_xdr;
e1a90ebd 1200
3fdc5464
CL		 1201 memset(&open_conf->oc_resp_stateid, 0,
1202 sizeof(open_conf->oc_resp_stateid));
06bee693 1203 return nfs_ok;
1da177e4
LT		 1204}
1205
b37ad28b 1206static __be32
e78e274e
KC		 1207nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp,
1208 union nfsd4_op_u *u)
1da177e4 1209{
e78e274e 1210 struct nfsd4_open_downgrade *open_down = &u->open_downgrade;
dca71651
CL		 1211 __be32 status;
1212
3fdc5464 1213 memset(open_down, 0, sizeof(*open_down));
dca71651 1214 status = nfsd4_decode_stateid4(argp, &open_down->od_stateid);
e31a1b66
BH		 1215 if (status)
1216 return status;
dca71651
CL		 1217 if (xdr_stream_decode_u32(argp->xdr, &open_down->od_seqid) < 0)
1218 return nfserr_bad_xdr;
1219 /* deleg_want is ignored */
2c8bd7e0
BH		 1220 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1221 &open_down->od_deleg_want, NULL);
04f9e664
BF		 1222 if (status)
1223 return status;
dca71651 1224 return nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1da177e4
LT		 1225}
1226
b37ad28b 1227static __be32
e78e274e 1228nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 1229{
e78e274e 1230 struct nfsd4_putfh *putfh = &u->putfh;
a73bed98 1231 __be32 *p;
1da177e4 1232
a73bed98
CL		 1233 if (xdr_stream_decode_u32(argp->xdr, &putfh->pf_fhlen) < 0)
1234 return nfserr_bad_xdr;
1da177e4 1235 if (putfh->pf_fhlen > NFS4_FHSIZE)
a73bed98
CL		 1236 return nfserr_bad_xdr;
1237 p = xdr_inline_decode(argp->xdr, putfh->pf_fhlen);
1238 if (!p)
1239 return nfserr_bad_xdr;
7b723008 1240 putfh->pf_fhval = svcxdr_savemem(argp, p, putfh->pf_fhlen);
a73bed98
CL		 1241 if (!putfh->pf_fhval)
1242 return nfserr_jukebox;
1da177e4 1243
3fdc5464 1244 putfh->no_verify = false;
a73bed98 1245 return nfs_ok;
1da177e4
LT		 1246}
1247
e1a90ebd 1248static __be32
e78e274e 1249nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
e1a90ebd
AS		 1250{
1251 if (argp->minorversion == 0)
1252 return nfs_ok;
1253 return nfserr_notsupp;
1254}
1255
b37ad28b 1256static __be32
e78e274e 1257nfsd4_decode_read(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 1258{
e78e274e 1259 struct nfsd4_read *read = &u->read;
3909c3bc 1260 __be32 status;
1da177e4 1261
3fdc5464 1262 memset(read, 0, sizeof(*read));
3909c3bc 1263 status = nfsd4_decode_stateid4(argp, &read->rd_stateid);
e31a1b66
BH		 1264 if (status)
1265 return status;
3909c3bc
CL		 1266 if (xdr_stream_decode_u64(argp->xdr, &read->rd_offset) < 0)
1267 return nfserr_bad_xdr;
1268 if (xdr_stream_decode_u32(argp->xdr, &read->rd_length) < 0)
1269 return nfserr_bad_xdr;
1da177e4 1270
3909c3bc 1271 return nfs_ok;
1da177e4
LT		 1272}
1273
b37ad28b 1274static __be32
e78e274e 1275nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 1276{
e78e274e 1277 struct nfsd4_readdir *readdir = &u->readdir;
0dfaf2a3 1278 __be32 status;
1da177e4 1279
3fdc5464 1280 memset(readdir, 0, sizeof(*readdir));
0dfaf2a3
CL		 1281 if (xdr_stream_decode_u64(argp->xdr, &readdir->rd_cookie) < 0)
1282 return nfserr_bad_xdr;
1283 status = nfsd4_decode_verifier4(argp, &readdir->rd_verf);
1284 if (status)
1285 return status;
1286 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_dircount) < 0)
1287 return nfserr_bad_xdr;
1288 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_maxcount) < 0)
1289 return nfserr_bad_xdr;
1290 if (xdr_stream_decode_uint32_array(argp->xdr, readdir->rd_bmval,
1291 ARRAY_SIZE(readdir->rd_bmval)) < 0)
1292 return nfserr_bad_xdr;
1da177e4 1293
0dfaf2a3 1294 return nfs_ok;
1da177e4
LT		 1295}
1296
b37ad28b 1297static __be32
e78e274e 1298nfsd4_decode_remove(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 1299{
e78e274e 1300 struct nfsd4_remove *remove = &u->remove;
3fdc5464 1301 memset(&remove->rm_cinfo, 0, sizeof(remove->rm_cinfo));
b7f5fbf2 1302 return nfsd4_decode_component4(argp, &remove->rm_name, &remove->rm_namelen);
1da177e4
LT		 1303}
1304
b37ad28b 1305static __be32
e78e274e 1306nfsd4_decode_rename(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 1307{
e78e274e 1308 struct nfsd4_rename *rename = &u->rename;
ba881a0a 1309 __be32 status;
1da177e4 1310
3fdc5464 1311 memset(rename, 0, sizeof(*rename));
ba881a0a
CL		 1312 status = nfsd4_decode_component4(argp, &rename->rn_sname, &rename->rn_snamelen);
1313 if (status)
1da177e4 1314 return status;
ba881a0a 1315 return nfsd4_decode_component4(argp, &rename->rn_tname, &rename->rn_tnamelen);
1da177e4
LT		 1316}
1317
b37ad28b 1318static __be32
e78e274e 1319nfsd4_decode_renew(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 1320{
e78e274e 1321 clientid_t *clientid = &u->renew;
d12f9045 1322 return nfsd4_decode_clientid4(argp, clientid);
1da177e4
LT		 1323}
1324
dcb488a3
AA		 1325static __be32
1326nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
e78e274e 1327 union nfsd4_op_u *u)
dcb488a3 1328{
e78e274e 1329 struct nfsd4_secinfo *secinfo = &u->secinfo;
3fdc5464 1330 secinfo->si_exp = NULL;
d0abdae5 1331 return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen);
dcb488a3
AA		 1332}
1333
b37ad28b 1334static __be32
e78e274e 1335nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 1336{
e78e274e 1337 struct nfsd4_setattr *setattr = &u->setattr;
e31a1b66 1338 __be32 status;
1da177e4 1339
3fdc5464 1340 memset(setattr, 0, sizeof(*setattr));
44592fe9 1341 status = nfsd4_decode_stateid4(argp, &setattr->sa_stateid);
e31a1b66
BH		 1342 if (status)
1343 return status;
d1c263a0
CL		 1344 return nfsd4_decode_fattr4(argp, setattr->sa_bmval,
1345 ARRAY_SIZE(setattr->sa_bmval),
1346 &setattr->sa_iattr, &setattr->sa_acl,
1347 &setattr->sa_label, NULL);
1da177e4
LT		 1348}
1349
b37ad28b 1350static __be32
e78e274e 1351nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 1352{
e78e274e 1353 struct nfsd4_setclientid *setclientid = &u->setclientid;
92fa6c08 1354 __be32 *p, status;
1da177e4 1355
3fdc5464
CL		 1356 memset(setclientid, 0, sizeof(*setclientid));
1357
e1a90ebd
AS		 1358 if (argp->minorversion >= 1)
1359 return nfserr_notsupp;
1360
92fa6c08
CL		 1361 status = nfsd4_decode_verifier4(argp, &setclientid->se_verf);
1362 if (status)
1363 return status;
a084daf5
BF		 1364 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1365 if (status)
92fa6c08
CL		 1366 return status;
1367 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_prog) < 0)
a084daf5 1368 return nfserr_bad_xdr;
92fa6c08
CL		 1369 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_netid_len) < 0)
1370 return nfserr_bad_xdr;
1371 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_netid_len);
1372 if (!p)
1373 return nfserr_bad_xdr;
7b723008 1374 setclientid->se_callback_netid_val = svcxdr_savemem(argp, p,
92fa6c08
CL		 1375 setclientid->se_callback_netid_len);
1376 if (!setclientid->se_callback_netid_val)
1377 return nfserr_jukebox;
1da177e4 1378
92fa6c08
CL		 1379 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_addr_len) < 0)
1380 return nfserr_bad_xdr;
1381 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_addr_len);
1382 if (!p)
1383 return nfserr_bad_xdr;
7b723008 1384 setclientid->se_callback_addr_val = svcxdr_savemem(argp, p,
92fa6c08
CL		 1385 setclientid->se_callback_addr_len);
1386 if (!setclientid->se_callback_addr_val)
1387 return nfserr_jukebox;
92fa6c08
CL		 1388 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_ident) < 0)
1389 return nfserr_bad_xdr;
1da177e4 1390
92fa6c08 1391 return nfs_ok;
1da177e4
LT		 1392}
1393
b37ad28b 1394static __be32
e78e274e
KC		 1395nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp,
1396 union nfsd4_op_u *u)
1da177e4 1397{
e78e274e 1398 struct nfsd4_setclientid_confirm *scd_c = &u->setclientid_confirm;
d1ca5514 1399 __be32 status;
1da177e4 1400
e1a90ebd
AS		 1401 if (argp->minorversion >= 1)
1402 return nfserr_notsupp;
1403
d1ca5514
CL		 1404 status = nfsd4_decode_clientid4(argp, &scd_c->sc_clientid);
1405 if (status)
1406 return status;
1407 return nfsd4_decode_verifier4(argp, &scd_c->sc_confirm);
1da177e4
LT		 1408}
1409
1410/* Also used for NVERIFY */
b37ad28b 1411static __be32
e78e274e 1412nfsd4_decode_verify(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 1413{
e78e274e 1414 struct nfsd4_verify *verify = &u->verify;
67cd453e 1415 __be32 *p, status;
1da177e4 1416
3fdc5464
CL		 1417 memset(verify, 0, sizeof(*verify));
1418
67cd453e
CL		 1419 status = nfsd4_decode_bitmap4(argp, verify->ve_bmval,
1420 ARRAY_SIZE(verify->ve_bmval));
1421 if (status)
1422 return status;
1da177e4
LT		 1423
1424 /* For convenience's sake, we compare raw xdr'd attributes in
e5f95703
BF		 1425 * nfsd4_proc_verify */
1426
67cd453e
CL		 1427 if (xdr_stream_decode_u32(argp->xdr, &verify->ve_attrlen) < 0)
1428 return nfserr_bad_xdr;
1429 p = xdr_inline_decode(argp->xdr, verify->ve_attrlen);
1430 if (!p)
1431 return nfserr_bad_xdr;
7b723008 1432 verify->ve_attrval = svcxdr_savemem(argp, p, verify->ve_attrlen);
67cd453e
CL		 1433 if (!verify->ve_attrval)
1434 return nfserr_jukebox;
1da177e4 1435
67cd453e 1436 return nfs_ok;
1da177e4
LT		 1437}
1438
b37ad28b 1439static __be32
e78e274e 1440nfsd4_decode_write(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1da177e4 1441{
e78e274e 1442 struct nfsd4_write *write = &u->write;
244e2bef 1443 __be32 status;
1da177e4 1444
244e2bef 1445 status = nfsd4_decode_stateid4(argp, &write->wr_stateid);
e31a1b66
BH		 1446 if (status)
1447 return status;
244e2bef
CL		 1448 if (xdr_stream_decode_u64(argp->xdr, &write->wr_offset) < 0)
1449 return nfserr_bad_xdr;
1450 if (xdr_stream_decode_u32(argp->xdr, &write->wr_stable_how) < 0)
1451 return nfserr_bad_xdr;
54bbb7d2 1452 if (write->wr_stable_how > NFS_FILE_SYNC)
244e2bef
CL		 1453 return nfserr_bad_xdr;
1454 if (xdr_stream_decode_u32(argp->xdr, &write->wr_buflen) < 0)
1455 return nfserr_bad_xdr;
c1346a12 1456 if (!xdr_stream_subsegment(argp->xdr, &write->wr_payload, write->wr_buflen))
244e2bef 1457 return nfserr_bad_xdr;
1da177e4 1458
3fdc5464
CL		 1459 write->wr_bytes_written = 0;
1460 write->wr_how_written = 0;
1461 memset(&write->wr_verifier, 0, sizeof(write->wr_verifier));
244e2bef 1462 return nfs_ok;
1da177e4
LT		 1463}
1464
b37ad28b 1465static __be32
e78e274e
KC		 1466nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp,
1467 union nfsd4_op_u *u)
1da177e4 1468{
e78e274e 1469 struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
a4a80c15 1470 __be32 status;
1da177e4 1471
e1a90ebd
AS		 1472 if (argp->minorversion >= 1)
1473 return nfserr_notsupp;
1474
a4a80c15
CL		 1475 status = nfsd4_decode_state_owner4(argp, &rlockowner->rl_clientid,
1476 &rlockowner->rl_owner);
1477 if (status)
1478 return status;
1da177e4 1479
60adfc50
AA		 1480 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1481 return nfserr_inval;
a4a80c15
CL		 1482
1483 return nfs_ok;
1da177e4
LT		 1484}
1485
e78e274e
KC		 1486static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp,
1487 union nfsd4_op_u *u)
0f81d960 1488{
e78e274e 1489 struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
3fdc5464 1490 memset(bc, 0, sizeof(*bc));
0f81d960
CL		 1491 if (xdr_stream_decode_u32(argp->xdr, &bc->bc_cb_program) < 0)
1492 return nfserr_bad_xdr;
1493 return nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
1494}
1495
e78e274e
KC		 1496static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp,
1497 union nfsd4_op_u *u)
571e0451 1498{
e78e274e 1499 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
571e0451
CL		 1500 u32 use_conn_in_rdma_mode;
1501 __be32 status;
1502
3fdc5464 1503 memset(bcts, 0, sizeof(*bcts));
571e0451
CL		 1504 status = nfsd4_decode_sessionid4(argp, &bcts->sessionid);
1505 if (status)
1506 return status;
1507 if (xdr_stream_decode_u32(argp->xdr, &bcts->dir) < 0)
1508 return nfserr_bad_xdr;
1509 if (xdr_stream_decode_u32(argp->xdr, &use_conn_in_rdma_mode) < 0)
1510 return nfserr_bad_xdr;
1511
1512 return nfs_ok;
1513}
1514
2548aa78
CL		 1515static __be32
1516nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp,
1517 struct nfsd4_exchange_id *exid)
1518{
1519 __be32 status;
1520
1521 status = nfsd4_decode_bitmap4(argp, exid->spo_must_enforce,
1522 ARRAY_SIZE(exid->spo_must_enforce));
1523 if (status)
1524 return nfserr_bad_xdr;
1525 status = nfsd4_decode_bitmap4(argp, exid->spo_must_allow,
1526 ARRAY_SIZE(exid->spo_must_allow));
1527 if (status)
1528 return nfserr_bad_xdr;
1529
1530 return nfs_ok;
1531}
1532
547bfeb4
CL		 1533/*
1534 * This implementation currently does not support SP4_SSV.
1535 * This decoder simply skips over these arguments.
1536 */
1537static noinline __be32
1538nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp,
1539 struct nfsd4_exchange_id *exid)
1540{
1541 u32 count, window, num_gss_handles;
1542 __be32 status;
1543
1544 /* ssp_ops */
1545 status = nfsd4_decode_state_protect_ops(argp, exid);
1546 if (status)
1547 return status;
1548
1549 /* ssp_hash_algs<> */
1550 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1551 return nfserr_bad_xdr;
1552 while (count--) {
1553 status = nfsd4_decode_ignored_string(argp, 0);
1554 if (status)
1555 return status;
1556 }
1557
1558 /* ssp_encr_algs<> */
1559 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1560 return nfserr_bad_xdr;
1561 while (count--) {
1562 status = nfsd4_decode_ignored_string(argp, 0);
1563 if (status)
1564 return status;
1565 }
1566
1567 if (xdr_stream_decode_u32(argp->xdr, &window) < 0)
1568 return nfserr_bad_xdr;
1569 if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0)
1570 return nfserr_bad_xdr;
1571
1572 return nfs_ok;
1573}
1574
2db134eb 1575static __be32
523ec6ed
CL		 1576nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp,
1577 struct nfsd4_exchange_id *exid)
2db134eb 1578{
523ec6ed 1579 __be32 status;
0733d213 1580
523ec6ed 1581 if (xdr_stream_decode_u32(argp->xdr, &exid->spa_how) < 0)
a084daf5 1582 return nfserr_bad_xdr;
0733d213
AA		 1583 switch (exid->spa_how) {
1584 case SP4_NONE:
1585 break;
1586 case SP4_MACH_CRED:
2548aa78 1587 status = nfsd4_decode_state_protect_ops(argp, exid);
ed941643 1588 if (status)
2548aa78 1589 return status;
0733d213
AA		 1590 break;
1591 case SP4_SSV:
547bfeb4 1592 status = nfsd4_decode_ssv_sp_parms(argp, exid);
2548aa78
CL		 1593 if (status)
1594 return status;
0733d213
AA		 1595 break;
1596 default:
523ec6ed 1597 return nfserr_bad_xdr;
0733d213
AA		 1598 }
1599
523ec6ed
CL		 1600 return nfs_ok;
1601}
1602
10ff8422
CL		 1603static __be32
1604nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp,
1605 struct nfsd4_exchange_id *exid)
1606{
1607 __be32 status;
1608 u32 count;
1609
1610 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1611 return nfserr_bad_xdr;
1612 switch (count) {
1613 case 0:
1614 break;
1615 case 1:
1616 /* Note that RFC 8881 places no length limit on
1617 * nii_domain, but this implementation permits no
1618 * more than NFS4_OPAQUE_LIMIT bytes */
1619 status = nfsd4_decode_opaque(argp, &exid->nii_domain);
1620 if (status)
1621 return status;
1622 /* Note that RFC 8881 places no length limit on
1623 * nii_name, but this implementation permits no
1624 * more than NFS4_OPAQUE_LIMIT bytes */
1625 status = nfsd4_decode_opaque(argp, &exid->nii_name);
1626 if (status)
1627 return status;
1628 status = nfsd4_decode_nfstime4(argp, &exid->nii_time);
1629 if (status)
1630 return status;
1631 break;
1632 default:
1633 return nfserr_bad_xdr;
1634 }
1635
1636 return nfs_ok;
1637}
1638
523ec6ed
CL		 1639static __be32
1640nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
e78e274e 1641 union nfsd4_op_u *u)
523ec6ed 1642{
e78e274e 1643 struct nfsd4_exchange_id *exid = &u->exchange_id;
10ff8422 1644 __be32 status;
523ec6ed 1645
3fdc5464 1646 memset(exid, 0, sizeof(*exid));
523ec6ed
CL		 1647 status = nfsd4_decode_verifier4(argp, &exid->verifier);
1648 if (status)
1649 return status;
1650 status = nfsd4_decode_opaque(argp, &exid->clname);
1651 if (status)
1652 return status;
1653 if (xdr_stream_decode_u32(argp->xdr, &exid->flags) < 0)
1654 return nfserr_bad_xdr;
1655 status = nfsd4_decode_state_protect4_a(argp, exid);
1656 if (status)
1657 return status;
10ff8422 1658 return nfsd4_decode_nfs_impl_id4(argp, exid);
2db134eb
AA		 1659}
1660
3a3f1fba
CL		 1661static __be32
1662nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp,
1663 struct nfsd4_channel_attrs *ca)
1664{
1665 __be32 *p;
1666
1667 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7);
1668 if (!p)
1669 return nfserr_bad_xdr;
1670
1671 /* headerpadsz is ignored */
1672 p++;
1673 ca->maxreq_sz = be32_to_cpup(p++);
1674 ca->maxresp_sz = be32_to_cpup(p++);
1675 ca->maxresp_cached = be32_to_cpup(p++);
1676 ca->maxops = be32_to_cpup(p++);
1677 ca->maxreqs = be32_to_cpup(p++);
1678 ca->nr_rdma_attrs = be32_to_cpup(p);
1679 switch (ca->nr_rdma_attrs) {
1680 case 0:
1681 break;
1682 case 1:
1683 if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0)
1684 return nfserr_bad_xdr;
1685 break;
1686 default:
1687 return nfserr_bad_xdr;
1688 }
1689
1690 return nfs_ok;
1691}
1692
2db134eb
AA		 1693static __be32
1694nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
e78e274e 1695 union nfsd4_op_u *u)
2db134eb 1696{
e78e274e 1697 struct nfsd4_create_session *sess = &u->create_session;
81243e3f 1698 __be32 status;
ec6b5d7b 1699
3fdc5464 1700 memset(sess, 0, sizeof(*sess));
81243e3f
CL		 1701 status = nfsd4_decode_clientid4(argp, &sess->clientid);
1702 if (status)
1703 return status;
1704 if (xdr_stream_decode_u32(argp->xdr, &sess->seqid) < 0)
1705 return nfserr_bad_xdr;
1706 if (xdr_stream_decode_u32(argp->xdr, &sess->flags) < 0)
1707 return nfserr_bad_xdr;
3a3f1fba
CL		 1708 status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel);
1709 if (status)
1710 return status;
1711 status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel);
81243e3f
CL		 1712 if (status)
1713 return status;
1714 if (xdr_stream_decode_u32(argp->xdr, &sess->callback_prog) < 0)
1715 return nfserr_bad_xdr;
3fdc5464 1716 return nfsd4_decode_cb_sec(argp, &sess->cb_sec);
2db134eb
AA		 1717}
1718
1719static __be32
1720nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
e78e274e 1721 union nfsd4_op_u *u)
2db134eb 1722{
e78e274e 1723 struct nfsd4_destroy_session *destroy_session = &u->destroy_session;
94e254af 1724 return nfsd4_decode_sessionid4(argp, &destroy_session->sessionid);
2db134eb
AA		 1725}
1726
e1ca12df
BS		 1727static __be32
1728nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
e78e274e 1729 union nfsd4_op_u *u)
e1ca12df 1730{
e78e274e 1731 struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
aec387d5 1732 return nfsd4_decode_stateid4(argp, &free_stateid->fr_stateid);
e1ca12df
BS		 1733}
1734
9cf514cc
CH		 1735#ifdef CONFIG_NFSD_PNFS
1736static __be32
1737nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
e78e274e 1738 union nfsd4_op_u *u)
9cf514cc 1739{
e78e274e 1740 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
04495971
CL		 1741 __be32 status;
1742
3fdc5464 1743 memset(gdev, 0, sizeof(*gdev));
04495971
CL		 1744 status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid);
1745 if (status)
1746 return status;
1747 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0)
1748 return nfserr_bad_xdr;
1749 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0)
1750 return nfserr_bad_xdr;
1751 if (xdr_stream_decode_uint32_array(argp->xdr,
1752 &gdev->gd_notify_types, 1) < 0)
1753 return nfserr_bad_xdr;
1754
1755 return nfs_ok;
9cf514cc
CH		 1756}
1757
5185980d
CL		 1758static __be32
1759nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
e78e274e 1760 union nfsd4_op_u *u)
5185980d 1761{
e78e274e 1762 struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
5185980d
CL		 1763 __be32 *p, status;
1764
3fdc5464 1765 memset(lcp, 0, sizeof(*lcp));
5185980d
CL		 1766 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0)
1767 return nfserr_bad_xdr;
1768 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0)
1769 return nfserr_bad_xdr;
1770 if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0)
1771 return nfserr_bad_xdr;
1772 status = nfsd4_decode_stateid4(argp, &lcp->lc_sid);
1773 if (status)
1774 return status;
1775 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0)
1776 return nfserr_bad_xdr;
1777 if (lcp->lc_newoffset) {
1778 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0)
1779 return nfserr_bad_xdr;
1780 } else
1781 lcp->lc_last_wr = 0;
1782 p = xdr_inline_decode(argp->xdr, XDR_UNIT);
1783 if (!p)
1784 return nfserr_bad_xdr;
1785 if (xdr_item_is_present(p)) {
1786 status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime);
1787 if (status)
1788 return status;
1789 } else {
1790 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1791 }
1792 return nfsd4_decode_layoutupdate4(argp, lcp);
1793}
1794
9cf514cc
CH		 1795static __be32
1796nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
e78e274e 1797 union nfsd4_op_u *u)
9cf514cc 1798{
e78e274e 1799 struct nfsd4_layoutget *lgp = &u->layoutget;
c8e88e3a 1800 __be32 status;
db59c0ef 1801
3fdc5464 1802 memset(lgp, 0, sizeof(*lgp));
c8e88e3a
CL		 1803 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_signal) < 0)
1804 return nfserr_bad_xdr;
1805 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_layout_type) < 0)
1806 return nfserr_bad_xdr;
1807 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_seg.iomode) < 0)
1808 return nfserr_bad_xdr;
1809 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.offset) < 0)
1810 return nfserr_bad_xdr;
1811 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.length) < 0)
1812 return nfserr_bad_xdr;
1813 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_minlength) < 0)
1814 return nfserr_bad_xdr;
1815 status = nfsd4_decode_stateid4(argp, &lgp->lg_sid);
db59c0ef
KM		 1816 if (status)
1817 return status;
c8e88e3a
CL		 1818 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_maxcount) < 0)
1819 return nfserr_bad_xdr;
db59c0ef 1820
c8e88e3a 1821 return nfs_ok;
9cf514cc
CH		 1822}
1823
9cf514cc
CH		 1824static __be32
1825nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
e78e274e 1826 union nfsd4_op_u *u)
9cf514cc 1827{
e78e274e 1828 struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
3fdc5464 1829 memset(lrp, 0, sizeof(*lrp));
645fcad3
CL		 1830 if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0)
1831 return nfserr_bad_xdr;
1832 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0)
1833 return nfserr_bad_xdr;
1834 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0)
1835 return nfserr_bad_xdr;
1836 return nfsd4_decode_layoutreturn4(argp, lrp);
9cf514cc
CH		 1837}
1838#endif /* CONFIG_NFSD_PNFS */
1839
53d70873 1840static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
e78e274e 1841 union nfsd4_op_u *u)
53d70873 1842{
e78e274e 1843 struct nfsd4_secinfo_no_name *sin = &u->secinfo_no_name;
53d70873
CL		 1844 if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0)
1845 return nfserr_bad_xdr;
3fdc5464
CL		 1846
1847 sin->sin_exp = NULL;
53d70873
CL		 1848 return nfs_ok;
1849}
1850
cf907b11
CL		 1851static __be32
1852nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
e78e274e 1853 union nfsd4_op_u *u)
cf907b11 1854{
e78e274e 1855 struct nfsd4_sequence *seq = &u->sequence;
cf907b11
CL		 1856 __be32 *p, status;
1857
1858 status = nfsd4_decode_sessionid4(argp, &seq->sessionid);
1859 if (status)
1860 return status;
1861 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4);
1862 if (!p)
1863 return nfserr_bad_xdr;
1864 seq->seqid = be32_to_cpup(p++);
1865 seq->slotid = be32_to_cpup(p++);
1866 seq->maxslots = be32_to_cpup(p++);
1867 seq->cachethis = be32_to_cpup(p);
1868
3fdc5464 1869 seq->status_flags = 0;
cf907b11
CL		 1870 return nfs_ok;
1871}
1872
b7a0c8f6 1873static __be32
e78e274e
KC		 1874nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp,
1875 union nfsd4_op_u *u)
b7a0c8f6 1876{
e78e274e 1877 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
b7a0c8f6
CL		 1878 struct nfsd4_test_stateid_id *stateid;
1879 __be32 status;
1880 u32 i;
1881
3fdc5464 1882 memset(test_stateid, 0, sizeof(*test_stateid));
b7a0c8f6
CL		 1883 if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0)
1884 return nfserr_bad_xdr;
1885
1886 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1887 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1888 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1889 if (!stateid)
bb4d8427 1890 return nfserr_jukebox;
b7a0c8f6
CL		 1891 INIT_LIST_HEAD(&stateid->ts_id_list);
1892 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1893 status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid);
1894 if (status)
1895 return status;
1896 }
1897
1898 return nfs_ok;
1899}
1900
c95f2ec3 1901static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp,
e78e274e 1902 union nfsd4_op_u *u)
c95f2ec3 1903{
e78e274e 1904 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
c95f2ec3
CL		 1905 return nfsd4_decode_clientid4(argp, &dc->clientid);
1906}
1907
0d646784 1908static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp,
e78e274e 1909 union nfsd4_op_u *u)
0d646784 1910{
e78e274e 1911 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
0d646784
CL		 1912 if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0)
1913 return nfserr_bad_xdr;
1914 return nfs_ok;
1915}
1916
95d871f0
AS		 1917static __be32
1918nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
e78e274e 1919 union nfsd4_op_u *u)
95d871f0 1920{
e78e274e 1921 struct nfsd4_fallocate *fallocate = &u->allocate;
6aef27aa 1922 __be32 status;
95d871f0 1923
6aef27aa 1924 status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid);
95d871f0
AS		 1925 if (status)
1926 return status;
6aef27aa
CL		 1927 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0)
1928 return nfserr_bad_xdr;
1929 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0)
1930 return nfserr_bad_xdr;
95d871f0 1931
6aef27aa 1932 return nfs_ok;
95d871f0
AS		 1933}
1934
84e1b21d
OK		 1935static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
1936 struct nl4_server *ns)
1937{
84e1b21d 1938 struct nfs42_netaddr *naddr;
f49e4b4d 1939 __be32 *p;
84e1b21d 1940
f49e4b4d
CL		 1941 if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0)
1942 return nfserr_bad_xdr;
84e1b21d
OK		 1943
1944 /* currently support for 1 inter-server source server */
1945 switch (ns->nl4_type) {
1946 case NL4_NETADDR:
1947 naddr = &ns->u.nl4_addr;
1948
f49e4b4d
CL		 1949 if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0)
1950 return nfserr_bad_xdr;
84e1b21d 1951 if (naddr->netid_len > RPCBIND_MAXNETIDLEN)
f49e4b4d 1952 return nfserr_bad_xdr;
84e1b21d 1953
f49e4b4d
CL		 1954 p = xdr_inline_decode(argp->xdr, naddr->netid_len);
1955 if (!p)
1956 return nfserr_bad_xdr;
1957 memcpy(naddr->netid, p, naddr->netid_len);
84e1b21d 1958
f49e4b4d
CL		 1959 if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0)
1960 return nfserr_bad_xdr;
84e1b21d 1961 if (naddr->addr_len > RPCBIND_MAXUADDRLEN)
f49e4b4d 1962 return nfserr_bad_xdr;
84e1b21d 1963
f49e4b4d
CL		 1964 p = xdr_inline_decode(argp->xdr, naddr->addr_len);
1965 if (!p)
1966 return nfserr_bad_xdr;
1967 memcpy(naddr->addr, p, naddr->addr_len);
84e1b21d
OK		 1968 break;
1969 default:
f49e4b4d 1970 return nfserr_bad_xdr;
84e1b21d 1971 }
f49e4b4d
CL		 1972
1973 return nfs_ok;
84e1b21d
OK		 1974}
1975
29ae7f9d 1976static __be32
e78e274e 1977nfsd4_decode_copy(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
29ae7f9d 1978{
e78e274e 1979 struct nfsd4_copy *copy = &u->copy;
1913cdf5 1980 u32 consecutive, i, count, sync;
84e1b21d 1981 struct nl4_server *ns_dummy;
e8febea7 1982 __be32 status;
29ae7f9d 1983
3fdc5464 1984 memset(copy, 0, sizeof(*copy));
e8febea7 1985 status = nfsd4_decode_stateid4(argp, &copy->cp_src_stateid);
29ae7f9d
AS		 1986 if (status)
1987 return status;
e8febea7 1988 status = nfsd4_decode_stateid4(argp, &copy->cp_dst_stateid);
29ae7f9d
AS		 1989 if (status)
1990 return status;
e8febea7
CL		 1991 if (xdr_stream_decode_u64(argp->xdr, &copy->cp_src_pos) < 0)
1992 return nfserr_bad_xdr;
1993 if (xdr_stream_decode_u64(argp->xdr, &copy->cp_dst_pos) < 0)
1994 return nfserr_bad_xdr;
1995 if (xdr_stream_decode_u64(argp->xdr, &copy->cp_count) < 0)
1996 return nfserr_bad_xdr;
1997 /* ca_consecutive: we always do consecutive copies */
1998 if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0)
1999 return nfserr_bad_xdr;
1913cdf5 2000 if (xdr_stream_decode_bool(argp->xdr, &sync) < 0)
e8febea7 2001 return nfserr_bad_xdr;
1913cdf5 2002 nfsd4_copy_set_sync(copy, sync);
29ae7f9d 2003
e8febea7
CL		 2004 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
2005 return nfserr_bad_xdr;
87689df6
CL		 2006 copy->cp_src = svcxdr_tmpalloc(argp, sizeof(*copy->cp_src));
2007 if (copy->cp_src == NULL)
2008 return nfserr_jukebox;
84e1b21d 2009 if (count == 0) { /* intra-server copy */
1913cdf5 2010 __set_bit(NFSD4_COPY_F_INTRA, &copy->cp_flags);
e8febea7 2011 return nfs_ok;
84e1b21d
OK		 2012 }
2013
e8febea7 2014 /* decode all the supplied server addresses but use only the first */
87689df6 2015 status = nfsd4_decode_nl4_server(argp, copy->cp_src);
84e1b21d
OK		 2016 if (status)
2017 return status;
2018
2019 ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL);
2020 if (ns_dummy == NULL)
bb4d8427 2021 return nfserr_jukebox;
84e1b21d
OK		 2022 for (i = 0; i < count - 1; i++) {
2023 status = nfsd4_decode_nl4_server(argp, ns_dummy);
2024 if (status) {
2025 kfree(ns_dummy);
2026 return status;
2027 }
2028 }
2029 kfree(ns_dummy);
29ae7f9d 2030
e8febea7 2031 return nfs_ok;
29ae7f9d
AS		 2032}
2033
51911868
OK		 2034static __be32
2035nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp,
e78e274e 2036 union nfsd4_op_u *u)
51911868 2037{
e78e274e 2038 struct nfsd4_copy_notify *cn = &u->copy_notify;
5aff7d08 2039 __be32 status;
51911868 2040
3fdc5464 2041 memset(cn, 0, sizeof(*cn));
09426ef2
CL		 2042 cn->cpn_src = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_src));
2043 if (cn->cpn_src == NULL)
2044 return nfserr_jukebox;
2045 cn->cpn_dst = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_dst));
2046 if (cn->cpn_dst == NULL)
2047 return nfserr_jukebox;
2048
f9a953fb 2049 status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid);
51911868
OK		 2050 if (status)
2051 return status;
09426ef2 2052 return nfsd4_decode_nl4_server(argp, cn->cpn_dst);
51911868
OK		 2053}
2054
f9a953fb
CL		 2055static __be32
2056nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
e78e274e 2057 union nfsd4_op_u *u)
f9a953fb 2058{
e78e274e 2059 struct nfsd4_offload_status *os = &u->offload_status;
3fdc5464
CL		 2060 os->count = 0;
2061 os->status = 0;
2846bb05 2062 return nfsd4_decode_stateid4(argp, &os->stateid);
f9a953fb
CL		 2063}
2064
24bab491 2065static __be32
e78e274e 2066nfsd4_decode_seek(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
24bab491 2067{
e78e274e 2068 struct nfsd4_seek *seek = &u->seek;
9d32b412 2069 __be32 status;
24bab491 2070
9d32b412 2071 status = nfsd4_decode_stateid4(argp, &seek->seek_stateid);
24bab491
AS		 2072 if (status)
2073 return status;
9d32b412
CL		 2074 if (xdr_stream_decode_u64(argp->xdr, &seek->seek_offset) < 0)
2075 return nfserr_bad_xdr;
2076 if (xdr_stream_decode_u32(argp->xdr, &seek->seek_whence) < 0)
2077 return nfserr_bad_xdr;
24bab491 2078
3fdc5464
CL		 2079 seek->seek_eof = 0;
2080 seek->seek_pos = 0;
9d32b412 2081 return nfs_ok;
24bab491
AS		 2082}
2083
3dfd0b0e 2084static __be32
e78e274e 2085nfsd4_decode_clone(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
3dfd0b0e 2086{
e78e274e 2087 struct nfsd4_clone *clone = &u->clone;
3dfd0b0e
CL		 2088 __be32 status;
2089
2090 status = nfsd4_decode_stateid4(argp, &clone->cl_src_stateid);
2091 if (status)
2092 return status;
2093 status = nfsd4_decode_stateid4(argp, &clone->cl_dst_stateid);
2094 if (status)
2095 return status;
2096 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_src_pos) < 0)
2097 return nfserr_bad_xdr;
2098 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_dst_pos) < 0)
2099 return nfserr_bad_xdr;
2100 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_count) < 0)
2101 return nfserr_bad_xdr;
2102
2103 return nfs_ok;
2104}
2105
23e50fe3
FL		 2106/*
2107 * XDR data that is more than PAGE_SIZE in size is normally part of a
2108 * read or write. However, the size of extended attributes is limited
2109 * by the maximum request size, and then further limited by the underlying
2110 * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX
2111 * is 64k). Since there is no kvec- or page-based interface to xattrs,
2112 * and we're not dealing with contiguous pages, we need to do some copying.
2113 */
2114
2115/*
c1346a12 2116 * Decode data into buffer.
23e50fe3
FL		 2117 */
2118static __be32
c1346a12
CL		 2119nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr,
2120 char **bufp, u32 buflen)
23e50fe3 2121{
c1346a12
CL		 2122 struct page **pages = xdr->pages;
2123 struct kvec *head = xdr->head;
23e50fe3
FL		 2124 char *tmp, *dp;
2125 u32 len;
2126
2127 if (buflen <= head->iov_len) {
2128 /*
2129 * We're in luck, the head has enough space. Just return
2130 * the head, no need for copying.
2131 */
2132 *bufp = head->iov_base;
2133 return 0;
2134 }
2135
2136 tmp = svcxdr_tmpalloc(argp, buflen);
2137 if (tmp == NULL)
2138 return nfserr_jukebox;
2139
2140 dp = tmp;
2141 memcpy(dp, head->iov_base, head->iov_len);
2142 buflen -= head->iov_len;
2143 dp += head->iov_len;
2144
2145 while (buflen > 0) {
2146 len = min_t(u32, buflen, PAGE_SIZE);
2147 memcpy(dp, page_address(*pages), len);
2148
2149 buflen -= len;
2150 dp += len;
2151 pages++;
2152 }
2153
2154 *bufp = tmp;
2155 return 0;
2156}
2157
2158/*
2159 * Get a user extended attribute name from the XDR buffer.
2160 * It will not have the "user." prefix, so prepend it.
2161 * Lastly, check for nul characters in the name.
2162 */
2163static __be32
2164nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep)
2165{
23e50fe3
FL		 2166 char *name, *sp, *dp;
2167 u32 namelen, cnt;
830c7150 2168 __be32 *p;
23e50fe3 2169
830c7150
CL		 2170 if (xdr_stream_decode_u32(argp->xdr, &namelen) < 0)
2171 return nfserr_bad_xdr;
23e50fe3
FL		 2172 if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN))
2173 return nfserr_nametoolong;
23e50fe3 2174 if (namelen == 0)
830c7150
CL		 2175 return nfserr_bad_xdr;
2176 p = xdr_inline_decode(argp->xdr, namelen);
2177 if (!p)
2178 return nfserr_bad_xdr;
23e50fe3
FL		 2179 name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1);
2180 if (!name)
2181 return nfserr_jukebox;
23e50fe3
FL		 2182 memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
2183
2184 /*
2185 * Copy the extended attribute name over while checking for 0
2186 * characters.
2187 */
2188 sp = (char *)p;
2189 dp = name + XATTR_USER_PREFIX_LEN;
2190 cnt = namelen;
2191
2192 while (cnt-- > 0) {
2193 if (*sp == '\0')
830c7150 2194 return nfserr_bad_xdr;
23e50fe3
FL		 2195 *dp++ = *sp++;
2196 }
2197 *dp = '\0';
2198
2199 *namep = name;
2200
830c7150 2201 return nfs_ok;
23e50fe3
FL		 2202}
2203
2204/*
2205 * A GETXATTR op request comes without a length specifier. We just set the
2206 * maximum length for the reply based on XATTR_SIZE_MAX and the maximum
2207 * channel reply size. nfsd_getxattr will probe the length of the xattr,
2208 * check it against getxa_len, and allocate + return the value.
2209 */
2210static __be32
2211nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp,
e78e274e 2212 union nfsd4_op_u *u)
23e50fe3 2213{
e78e274e 2214 struct nfsd4_getxattr *getxattr = &u->getxattr;
23e50fe3
FL		 2215 __be32 status;
2216 u32 maxcount;
2217
3fdc5464 2218 memset(getxattr, 0, sizeof(*getxattr));
23e50fe3
FL		 2219 status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name);
2220 if (status)
2221 return status;
2222
2223 maxcount = svc_max_payload(argp->rqstp);
2224 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2225
2226 getxattr->getxa_len = maxcount;
3fdc5464 2227 return nfs_ok;
23e50fe3
FL		 2228}
2229
2230static __be32
2231nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp,
e78e274e 2232 union nfsd4_op_u *u)
23e50fe3 2233{
e78e274e 2234 struct nfsd4_setxattr *setxattr = &u->setxattr;
23e50fe3 2235 u32 flags, maxcount, size;
403366a7 2236 __be32 status;
23e50fe3 2237
3fdc5464
CL		 2238 memset(setxattr, 0, sizeof(*setxattr));
2239
403366a7
CL		 2240 if (xdr_stream_decode_u32(argp->xdr, &flags) < 0)
2241 return nfserr_bad_xdr;
23e50fe3
FL		 2242
2243 if (flags > SETXATTR4_REPLACE)
2244 return nfserr_inval;
2245 setxattr->setxa_flags = flags;
2246
2247 status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name);
2248 if (status)
2249 return status;
2250
2251 maxcount = svc_max_payload(argp->rqstp);
2252 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2253
403366a7
CL		 2254 if (xdr_stream_decode_u32(argp->xdr, &size) < 0)
2255 return nfserr_bad_xdr;
23e50fe3
FL		 2256 if (size > maxcount)
2257 return nfserr_xattr2big;
2258
2259 setxattr->setxa_len = size;
2260 if (size > 0) {
c1346a12 2261 struct xdr_buf payload;
23e50fe3 2262
c1346a12 2263 if (!xdr_stream_subsegment(argp->xdr, &payload, size))
403366a7 2264 return nfserr_bad_xdr;
c1346a12
CL		 2265 status = nfsd4_vbuf_from_vector(argp, &payload,
2266 &setxattr->setxa_buf, size);
23e50fe3
FL		 2267 }
2268
403366a7 2269 return nfs_ok;
23e50fe3
FL		 2270}
2271
2272static __be32
2273nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp,
e78e274e 2274 union nfsd4_op_u *u)
23e50fe3 2275{
e78e274e 2276 struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
23e50fe3
FL		 2277 u32 maxcount;
2278
3fdc5464
CL		 2279 memset(listxattrs, 0, sizeof(*listxattrs));
2280
2212036c
CL		 2281 if (xdr_stream_decode_u64(argp->xdr, &listxattrs->lsxa_cookie) < 0)
2282 return nfserr_bad_xdr;
23e50fe3
FL		 2283
2284 /*
2285 * If the cookie is too large to have even one user.x attribute
2286 * plus trailing '\0' left in a maximum size buffer, it's invalid.
2287 */
2288 if (listxattrs->lsxa_cookie >=
2289 (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2)))
2290 return nfserr_badcookie;
2291
2212036c
CL		 2292 if (xdr_stream_decode_u32(argp->xdr, &maxcount) < 0)
2293 return nfserr_bad_xdr;
23e50fe3
FL		 2294 if (maxcount < 8)
2295 /* Always need at least 2 words (length and one character) */
2296 return nfserr_inval;
2297
2298 maxcount = min(maxcount, svc_max_payload(argp->rqstp));
2299 listxattrs->lsxa_maxcount = maxcount;
2300
2212036c 2301 return nfs_ok;
23e50fe3
FL		 2302}
2303
2304static __be32
2305nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp,
e78e274e 2306 union nfsd4_op_u *u)
23e50fe3 2307{
e78e274e 2308 struct nfsd4_removexattr *removexattr = &u->removexattr;
3fdc5464 2309 memset(removexattr, 0, sizeof(*removexattr));
23e50fe3
FL		 2310 return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name);
2311}
2312
347e0ad9 2313static __be32
e78e274e 2314nfsd4_decode_noop(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
347e0ad9
BH		 2315{
2316 return nfs_ok;
2317}
2318
3c375c6f 2319static __be32
e78e274e 2320nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
3c375c6f 2321{
1e685ec2 2322 return nfserr_notsupp;
3c375c6f
BH		 2323}
2324
e78e274e 2325typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u);
347e0ad9 2326
c1df609d 2327static const nfsd4_dec nfsd4_dec_ops[] = {
e78e274e
KC		 2328 [OP_ACCESS] = nfsd4_decode_access,
2329 [OP_CLOSE] = nfsd4_decode_close,
2330 [OP_COMMIT] = nfsd4_decode_commit,
2331 [OP_CREATE] = nfsd4_decode_create,
2332 [OP_DELEGPURGE] = nfsd4_decode_notsupp,
2333 [OP_DELEGRETURN] = nfsd4_decode_delegreturn,
2334 [OP_GETATTR] = nfsd4_decode_getattr,
2335 [OP_GETFH] = nfsd4_decode_noop,
2336 [OP_LINK] = nfsd4_decode_link,
2337 [OP_LOCK] = nfsd4_decode_lock,
2338 [OP_LOCKT] = nfsd4_decode_lockt,
2339 [OP_LOCKU] = nfsd4_decode_locku,
2340 [OP_LOOKUP] = nfsd4_decode_lookup,
2341 [OP_LOOKUPP] = nfsd4_decode_noop,
2342 [OP_NVERIFY] = nfsd4_decode_verify,
2343 [OP_OPEN] = nfsd4_decode_open,
2344 [OP_OPENATTR] = nfsd4_decode_notsupp,
2345 [OP_OPEN_CONFIRM] = nfsd4_decode_open_confirm,
2346 [OP_OPEN_DOWNGRADE] = nfsd4_decode_open_downgrade,
2347 [OP_PUTFH] = nfsd4_decode_putfh,
2348 [OP_PUTPUBFH] = nfsd4_decode_putpubfh,
2349 [OP_PUTROOTFH] = nfsd4_decode_noop,
2350 [OP_READ] = nfsd4_decode_read,
2351 [OP_READDIR] = nfsd4_decode_readdir,
2352 [OP_READLINK] = nfsd4_decode_noop,
2353 [OP_REMOVE] = nfsd4_decode_remove,
2354 [OP_RENAME] = nfsd4_decode_rename,
2355 [OP_RENEW] = nfsd4_decode_renew,
2356 [OP_RESTOREFH] = nfsd4_decode_noop,
2357 [OP_SAVEFH] = nfsd4_decode_noop,
2358 [OP_SECINFO] = nfsd4_decode_secinfo,
2359 [OP_SETATTR] = nfsd4_decode_setattr,
2360 [OP_SETCLIENTID] = nfsd4_decode_setclientid,
2361 [OP_SETCLIENTID_CONFIRM] = nfsd4_decode_setclientid_confirm,
2362 [OP_VERIFY] = nfsd4_decode_verify,
2363 [OP_WRITE] = nfsd4_decode_write,
2364 [OP_RELEASE_LOCKOWNER] = nfsd4_decode_release_lockowner,
2db134eb
AA		 2365
2366 /* new operations for NFSv4.1 */
e78e274e
KC		 2367 [OP_BACKCHANNEL_CTL] = nfsd4_decode_backchannel_ctl,
2368 [OP_BIND_CONN_TO_SESSION] = nfsd4_decode_bind_conn_to_session,
2369 [OP_EXCHANGE_ID] = nfsd4_decode_exchange_id,
2370 [OP_CREATE_SESSION] = nfsd4_decode_create_session,
2371 [OP_DESTROY_SESSION] = nfsd4_decode_destroy_session,
2372 [OP_FREE_STATEID] = nfsd4_decode_free_stateid,
2373 [OP_GET_DIR_DELEGATION] = nfsd4_decode_notsupp,
9cf514cc 2374#ifdef CONFIG_NFSD_PNFS
e78e274e
KC		 2375 [OP_GETDEVICEINFO] = nfsd4_decode_getdeviceinfo,
2376 [OP_GETDEVICELIST] = nfsd4_decode_notsupp,
2377 [OP_LAYOUTCOMMIT] = nfsd4_decode_layoutcommit,
2378 [OP_LAYOUTGET] = nfsd4_decode_layoutget,
2379 [OP_LAYOUTRETURN] = nfsd4_decode_layoutreturn,
9cf514cc 2380#else
e78e274e
KC		 2381 [OP_GETDEVICEINFO] = nfsd4_decode_notsupp,
2382 [OP_GETDEVICELIST] = nfsd4_decode_notsupp,
2383 [OP_LAYOUTCOMMIT] = nfsd4_decode_notsupp,
2384 [OP_LAYOUTGET] = nfsd4_decode_notsupp,
2385 [OP_LAYOUTRETURN] = nfsd4_decode_notsupp,
9cf514cc 2386#endif
e78e274e
KC		 2387 [OP_SECINFO_NO_NAME] = nfsd4_decode_secinfo_no_name,
2388 [OP_SEQUENCE] = nfsd4_decode_sequence,
2389 [OP_SET_SSV] = nfsd4_decode_notsupp,
2390 [OP_TEST_STATEID] = nfsd4_decode_test_stateid,
2391 [OP_WANT_DELEGATION] = nfsd4_decode_notsupp,
2392 [OP_DESTROY_CLIENTID] = nfsd4_decode_destroy_clientid,
2393 [OP_RECLAIM_COMPLETE] = nfsd4_decode_reclaim_complete,
87a15a80
AS		 2394
2395 /* new operations for NFSv4.2 */
e78e274e
KC		 2396 [OP_ALLOCATE] = nfsd4_decode_fallocate,
2397 [OP_COPY] = nfsd4_decode_copy,
2398 [OP_COPY_NOTIFY] = nfsd4_decode_copy_notify,
2399 [OP_DEALLOCATE] = nfsd4_decode_fallocate,
2400 [OP_IO_ADVISE] = nfsd4_decode_notsupp,
2401 [OP_LAYOUTERROR] = nfsd4_decode_notsupp,
2402 [OP_LAYOUTSTATS] = nfsd4_decode_notsupp,
2403 [OP_OFFLOAD_CANCEL] = nfsd4_decode_offload_status,
2404 [OP_OFFLOAD_STATUS] = nfsd4_decode_offload_status,
2405 [OP_READ_PLUS] = nfsd4_decode_read,
2406 [OP_SEEK] = nfsd4_decode_seek,
2407 [OP_WRITE_SAME] = nfsd4_decode_notsupp,
2408 [OP_CLONE] = nfsd4_decode_clone,
23e50fe3 2409 /* RFC 8276 extended atributes operations */
e78e274e
KC		 2410 [OP_GETXATTR] = nfsd4_decode_getxattr,
2411 [OP_SETXATTR] = nfsd4_decode_setxattr,
2412 [OP_LISTXATTRS] = nfsd4_decode_listxattrs,
2413 [OP_REMOVEXATTR] = nfsd4_decode_removexattr,
2db134eb
AA		 2414};
2415
e1a90ebd
AS		 2416static inline bool
2417nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
2418{
8217d146 2419 if (op->opnum < FIRST_NFS4_OP)
e1a90ebd 2420 return false;
8217d146 2421 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
e1a90ebd 2422 return false;
8217d146
AS		 2423 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
2424 return false;
2425 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
e1a90ebd
AS		 2426 return false;
2427 return true;
2428}
f2feb96b 2429
c44b31c2 2430static bool
1da177e4
LT		 2431nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
2432{
1da177e4 2433 struct nfsd4_op *op;
1091006c 2434 bool cachethis = false;
a5cddc88
BF		 2435 int auth_slack= argp->rqstp->rq_auth_slack;
2436 int max_reply = auth_slack + 8; /* opcnt, status */
b0e35fda
BF		 2437 int readcount = 0;
2438 int readbytes = 0;
d9b74bda 2439 __be32 *p;
1da177e4
LT		 2440 int i;
2441
d9b74bda 2442 if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0)
c44b31c2 2443 return false;
d9b74bda
CL		 2444 max_reply += XDR_UNIT;
2445 argp->tag = NULL;
2446 if (unlikely(argp->taglen)) {
2447 if (argp->taglen > NFSD4_MAX_TAGLEN)
c44b31c2 2448 return false;
d9b74bda
CL		 2449 p = xdr_inline_decode(argp->xdr, argp->taglen);
2450 if (!p)
c44b31c2 2451 return false;
7b723008 2452 argp->tag = svcxdr_savemem(argp, p, argp->taglen);
d9b74bda 2453 if (!argp->tag)
c44b31c2 2454 return false;
d9b74bda
CL		 2455 max_reply += xdr_align_size(argp->taglen);
2456 }
2457
2458 if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0)
c44b31c2 2459 return false;
7518a3dc 2460 if (xdr_stream_decode_u32(argp->xdr, &argp->client_opcnt) < 0)
c44b31c2 2461 return false;
7518a3dc
CL		 2462 argp->opcnt = min_t(u32, argp->client_opcnt,
2463 NFSD_MAX_OPS_PER_COMPOUND);
1da177e4 2464
e8c96f8c 2465 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
80e591ce 2466 argp->ops = vcalloc(argp->opcnt, sizeof(*argp->ops));
1da177e4
LT		 2467 if (!argp->ops) {
2468 argp->ops = argp->iops;
c44b31c2 2469 return false;
1da177e4
LT		 2470 }
2471 }
2472
e1a90ebd 2473 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
30cff1ff
BH		 2474 argp->opcnt = 0;
2475
1da177e4
LT		 2476 for (i = 0; i < argp->opcnt; i++) {
2477 op = &argp->ops[i];
2478 op->replay = NULL;
2479
3a237b4a 2480 if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0)
c44b31c2 2481 return false;
08281341 2482 if (nfsd4_opnum_in_range(argp, op)) {
e1a90ebd 2483 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
08281341
CL		 2484 if (op->status != nfs_ok)
2485 trace_nfsd_compound_decode_err(argp->rqstp,
2486 argp->opcnt, i,
2487 op->opnum,
2488 op->status);
2489 } else {
1da177e4
LT		 2490 op->opnum = OP_ILLEGAL;
2491 op->status = nfserr_op_illegal;
1da177e4 2492 }
f4f9ef4a 2493 op->opdesc = OPDESC(op);
1091006c
BF		 2494 /*
2495 * We'll try to cache the result in the DRC if any one
2496 * op in the compound wants to be cached:
2497 */
2498 cachethis |= nfsd4_cache_this_op(op);
6ff40dec 2499
528b8493 2500 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) {
b0e35fda
BF		 2501 readcount++;
2502 readbytes += nfsd4_max_reply(argp->rqstp, op);
2503 } else
2504 max_reply += nfsd4_max_reply(argp->rqstp, op);
f7b43d0c 2505 /*
7323f0d2
KM		 2506 * OP_LOCK and OP_LOCKT may return a conflicting lock.
2507 * (Special case because it will just skip encoding this
2508 * if it runs out of xdr buffer space, and it is the only
2509 * operation that behaves this way.)
f7b43d0c 2510 */
7323f0d2 2511 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
f7b43d0c 2512 max_reply += NFS4_OPAQUE_LIMIT;
e372ba60
BF		 2513
2514 if (op->status) {
2515 argp->opcnt = i+1;
2516 break;
2517 }
1da177e4 2518 }
1091006c
BF		 2519 /* Sessions make the DRC unnecessary: */
2520 if (argp->minorversion)
2521 cachethis = false;
b0e35fda 2522 svc_reserve(argp->rqstp, max_reply + readbytes);
1091006c 2523 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1da177e4 2524
a5cddc88 2525 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
7827c81f 2526 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
b0e35fda 2527
c44b31c2 2528 return true;
1da177e4 2529}
1da177e4 2530
b8800921
N		 2531static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
2532 struct svc_export *exp)
c654b8a9 2533{
b8800921
N		 2534 if (exp->ex_flags & NFSEXP_V4ROOT) {
2535 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
2536 *p++ = 0;
70b87f77 2537 } else
39ca1bf6 2538 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
d05d5744 2539 return p;
c654b8a9
BF		 2540}
2541
16945141
BF		 2542/*
2543 * ctime (in NFSv4, time_metadata) is not writeable, and the client
2544 * doesn't really care what resolution could theoretically be stored by
2545 * the filesystem.
2546 *
2547 * The client cares how close together changes can be while still
2548 * guaranteeing ctime changes. For most filesystems (which have
2549 * timestamps with nanosecond fields) that is limited by the resolution
2550 * of the time returned from current_time() (which I'm assuming to be
2551 * 1/HZ).
2552 */
2553static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2554{
e4598e38 2555 struct timespec64 ts;
16945141
BF		 2556 u32 ns;
2557
2558 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
e4598e38 2559 ts = ns_to_timespec64(ns);
16945141
BF		 2560
2561 p = xdr_encode_hyper(p, ts.tv_sec);
2562 *p++ = cpu_to_be32(ts.tv_nsec);
2563
2564 return p;
2565}
2566
d05d5744 2567static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
c654b8a9 2568{
d05d5744 2569 *p++ = cpu_to_be32(c->atomic);
b2140338
BF		 2570 p = xdr_encode_hyper(p, c->before_change);
2571 p = xdr_encode_hyper(p, c->after_change);
d05d5744 2572 return p;
c654b8a9 2573}
1da177e4 2574
81c3f413 2575/* Encode as an array of strings the string given with components
e7a0444a 2576 * separated @sep, escaped with esc_enter and esc_exit.
81c3f413 2577 */
ddd1ea56
BF		 2578static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2579 char *components, char esc_enter,
2580 char esc_exit)
81c3f413 2581{
ddd1ea56 2582 __be32 *p;
082d4bd7
BF		 2583 __be32 pathlen;
2584 int pathlen_offset;
81c3f413 2585 int strlen, count=0;
e7a0444a 2586 char *str, *end, *next;
81c3f413
BF		 2587
2588 dprintk("nfsd4_encode_components(%s)\n", components);
082d4bd7
BF		 2589
2590 pathlen_offset = xdr->buf->len;
ddd1ea56
BF		 2591 p = xdr_reserve_space(xdr, 4);
2592 if (!p)
81c3f413 2593 return nfserr_resource;
082d4bd7
BF		 2594 p++; /* We will fill this in with @count later */
2595
81c3f413
BF		 2596 end = str = components;
2597 while (*end) {
e7a0444a
WAA		 2598 bool found_esc = false;
2599
2600 /* try to parse as esc_start, ..., esc_end, sep */
2601 if (*str == esc_enter) {
2602 for (; *end && (*end != esc_exit); end++)
2603 /* find esc_exit or end of string */;
2604 next = end + 1;
2605 if (*end && (!*next || *next == sep)) {
2606 str++;
2607 found_esc = true;
2608 }
2609 }
2610
2611 if (!found_esc)
2612 for (; *end && (*end != sep); end++)
2613 /* find sep or end of string */;
2614
81c3f413
BF		 2615 strlen = end - str;
2616 if (strlen) {
ddd1ea56
BF		 2617 p = xdr_reserve_space(xdr, strlen + 4);
2618 if (!p)
81c3f413 2619 return nfserr_resource;
0c0c267b 2620 p = xdr_encode_opaque(p, str, strlen);
81c3f413
BF		 2621 count++;
2622 }
2623 else
2624 end++;
5a64e569
BC		 2625 if (found_esc)
2626 end = next;
2627
81c3f413
BF		 2628 str = end;
2629 }
bf7491f1 2630 pathlen = htonl(count);
082d4bd7 2631 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
81c3f413
BF		 2632 return 0;
2633}
2634
e7a0444a
WAA		 2635/* Encode as an array of strings the string given with components
2636 * separated @sep.
2637 */
ddd1ea56
BF		 2638static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2639 char *components)
e7a0444a 2640{
ddd1ea56 2641 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
e7a0444a
WAA		 2642}
2643
81c3f413
BF		 2644/*
2645 * encode a location element of a fs_locations structure
2646 */
ddd1ea56
BF		 2647static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2648 struct nfsd4_fs_location *location)
81c3f413 2649{
b37ad28b 2650 __be32 status;
81c3f413 2651
ddd1ea56 2652 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
e7a0444a 2653 '[', ']');
81c3f413
BF		 2654 if (status)
2655 return status;
ddd1ea56 2656 status = nfsd4_encode_components(xdr, '/', location->path);
81c3f413
BF		 2657 if (status)
2658 return status;
81c3f413
BF		 2659 return 0;
2660}
2661
2662/*
ed748aac 2663 * Encode a path in RFC3530 'pathname4' format
81c3f413 2664 */
ddd1ea56
BF		 2665static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2666 const struct path *root,
2667 const struct path *path)
81c3f413 2668{
301f0268 2669 struct path cur = *path;
ddd1ea56 2670 __be32 *p;
ed748aac
TM		 2671 struct dentry **components = NULL;
2672 unsigned int ncomponents = 0;
2673 __be32 err = nfserr_jukebox;
81c3f413 2674
ed748aac 2675 dprintk("nfsd4_encode_components(");
81c3f413 2676
ed748aac
TM		 2677 path_get(&cur);
2678 /* First walk the path up to the nfsd root, and store the
2679 * dentries/path components in an array.
2680 */
2681 for (;;) {
b77a4b2e 2682 if (path_equal(&cur, root))
ed748aac
TM		 2683 break;
2684 if (cur.dentry == cur.mnt->mnt_root) {
2685 if (follow_up(&cur))
2686 continue;
2687 goto out_free;
2688 }
2689 if ((ncomponents & 15) == 0) {
2690 struct dentry **new;
2691 new = krealloc(components,
2692 sizeof(*new) * (ncomponents + 16),
2693 GFP_KERNEL);
2694 if (!new)
2695 goto out_free;
2696 components = new;
2697 }
2698 components[ncomponents++] = cur.dentry;
2699 cur.dentry = dget_parent(cur.dentry);
2700 }
ddd1ea56
BF		 2701 err = nfserr_resource;
2702 p = xdr_reserve_space(xdr, 4);
2703 if (!p)
ed748aac 2704 goto out_free;
c373b0a4 2705 *p++ = cpu_to_be32(ncomponents);
ed748aac
TM		 2706
2707 while (ncomponents) {
2708 struct dentry *dentry = components[ncomponents - 1];
301f0268 2709 unsigned int len;
ed748aac 2710
301f0268
AV		 2711 spin_lock(&dentry->d_lock);
2712 len = dentry->d_name.len;
ddd1ea56
BF		 2713 p = xdr_reserve_space(xdr, len + 4);
2714 if (!p) {
301f0268 2715 spin_unlock(&dentry->d_lock);
ed748aac 2716 goto out_free;
301f0268 2717 }
0c0c267b 2718 p = xdr_encode_opaque(p, dentry->d_name.name, len);
a455589f 2719 dprintk("/%pd", dentry);
301f0268 2720 spin_unlock(&dentry->d_lock);
ed748aac
TM		 2721 dput(dentry);
2722 ncomponents--;
81c3f413 2723 }
ed748aac 2724
ed748aac
TM		 2725 err = 0;
2726out_free:
2727 dprintk(")\n");
2728 while (ncomponents)
2729 dput(components[--ncomponents]);
2730 kfree(components);
2731 path_put(&cur);
2732 return err;
2733}
2734
ddd1ea56
BF		 2735static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2736 struct svc_rqst *rqstp, const struct path *path)
ed748aac
TM		 2737{
2738 struct svc_export *exp_ps;
2739 __be32 res;
2740
2741 exp_ps = rqst_find_fsidzero_export(rqstp);
2742 if (IS_ERR(exp_ps))
2743 return nfserrno(PTR_ERR(exp_ps));
ddd1ea56 2744 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
ed748aac
TM		 2745 exp_put(exp_ps);
2746 return res;
81c3f413
BF		 2747}
2748
2749/*
2750 * encode a fs_locations structure
2751 */
ddd1ea56
BF		 2752static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2753 struct svc_rqst *rqstp, struct svc_export *exp)
81c3f413 2754{
b37ad28b 2755 __be32 status;
cc45f017 2756 int i;
ddd1ea56 2757 __be32 *p;
81c3f413 2758 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
81c3f413 2759
ddd1ea56 2760 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
81c3f413
BF		 2761 if (status)
2762 return status;
ddd1ea56
BF		 2763 p = xdr_reserve_space(xdr, 4);
2764 if (!p)
81c3f413 2765 return nfserr_resource;
c373b0a4 2766 *p++ = cpu_to_be32(fslocs->locations_count);
81c3f413 2767 for (i=0; i<fslocs->locations_count; i++) {
ddd1ea56 2768 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
81c3f413
BF		 2769 if (status)
2770 return status;
2771 }
81c3f413
BF		 2772 return 0;
2773}
1da177e4 2774
3d2544b1
BF		 2775static u32 nfs4_file_type(umode_t mode)
2776{
2777 switch (mode & S_IFMT) {
2778 case S_IFIFO: return NF4FIFO;
2779 case S_IFCHR: return NF4CHR;
2780 case S_IFDIR: return NF4DIR;
2781 case S_IFBLK: return NF4BLK;
2782 case S_IFLNK: return NF4LNK;
2783 case S_IFREG: return NF4REG;
2784 case S_IFSOCK: return NF4SOCK;
2785 default: return NF4BAD;
25fef48b 2786 }
3d2544b1 2787}
1da177e4 2788
b37ad28b 2789static inline __be32
ddd1ea56
BF		 2790nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2791 struct nfs4_ace *ace)
1da177e4 2792{
3554116d 2793 if (ace->whotype != NFS4_ACL_WHO_NAMED)
ddd1ea56 2794 return nfs4_acl_write_who(xdr, ace->whotype);
3554116d 2795 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
ddd1ea56 2796 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
3554116d 2797 else
ddd1ea56 2798 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1da177e4
LT		 2799}
2800
6896f15a 2801static inline __be32
8a4c3926 2802nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
6896f15a 2803{
8a4c3926
JL		 2804 __be32 *p;
2805 unsigned long i = hweight_long(layout_types);
6896f15a 2806
8a4c3926
JL		 2807 p = xdr_reserve_space(xdr, 4 + 4 * i);
2808 if (!p)
2809 return nfserr_resource;
2810
2811 *p++ = cpu_to_be32(i);
2812
2813 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2814 if (layout_types & (1 << i))
2815 *p++ = cpu_to_be32(i);
6896f15a
KM		 2816
2817 return 0;
2818}
2819
42ca0993
BF		 2820#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2821 FATTR4_WORD0_RDATTR_ERROR)
2822#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
c2227a39 2823#define WORD2_ABSENT_FS_ATTRS 0
42ca0993 2824
18032ca0
DQ		 2825#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2826static inline __be32
ddd1ea56
BF		 2827nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2828 void *context, int len)
18032ca0 2829{
ddd1ea56 2830 __be32 *p;
18032ca0 2831
ddd1ea56
BF		 2832 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2833 if (!p)
18032ca0
DQ		 2834 return nfserr_resource;
2835
2836 /*
2837 * For now we use a 0 here to indicate the null translation; in
2838 * the future we may place a call to translation code here.
2839 */
c373b0a4
BF		 2840 *p++ = cpu_to_be32(0); /* lfs */
2841 *p++ = cpu_to_be32(0); /* pi */
18032ca0 2842 p = xdr_encode_opaque(p, context, len);
18032ca0
DQ		 2843 return 0;
2844}
2845#else
2846static inline __be32
ddd1ea56
BF		 2847nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2848 void *context, int len)
18032ca0
DQ		 2849{ return 0; }
2850#endif
2851
c2227a39 2852static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
42ca0993
BF		 2853{
2854 /* As per referral draft: */
2855 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2856 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2857 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2858 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2859 *rdattr_err = NFSERR_MOVED;
2860 else
2861 return nfserr_moved;
2862 }
2863 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2864 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
c2227a39 2865 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
42ca0993
BF		 2866 return 0;
2867}
1da177e4 2868
ae7095a7 2869
6106d911 2870static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino)
ae7095a7
BF		 2871{
2872 struct path path = exp->ex_path;
6106d911 2873 struct kstat stat;
ae7095a7
BF		 2874 int err;
2875
2876 path_get(&path);
2877 while (follow_up(&path)) {
2878 if (path.dentry != path.mnt->mnt_root)
2879 break;
2880 }
6106d911 2881 err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT);
ae7095a7 2882 path_put(&path);
6106d911
JL		 2883 if (!err)
2884 *pino = stat.ino;
ae7095a7
BF		 2885 return err;
2886}
2887
75976de6
KM		 2888static __be32
2889nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2890{
2891 __be32 *p;
2892
2893 if (bmval2) {
2894 p = xdr_reserve_space(xdr, 16);
2895 if (!p)
2896 goto out_resource;
2897 *p++ = cpu_to_be32(3);
2898 *p++ = cpu_to_be32(bmval0);
2899 *p++ = cpu_to_be32(bmval1);
2900 *p++ = cpu_to_be32(bmval2);
2901 } else if (bmval1) {
2902 p = xdr_reserve_space(xdr, 12);
2903 if (!p)
2904 goto out_resource;
2905 *p++ = cpu_to_be32(2);
2906 *p++ = cpu_to_be32(bmval0);
2907 *p++ = cpu_to_be32(bmval1);
2908 } else {
2909 p = xdr_reserve_space(xdr, 8);
2910 if (!p)
2911 goto out_resource;
2912 *p++ = cpu_to_be32(1);
2913 *p++ = cpu_to_be32(bmval0);
2914 }
2915
2916 return 0;
2917out_resource:
2918 return nfserr_resource;
2919}
2920
1da177e4
LT		 2921/*
2922 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2923 * ourselves.
1da177e4 2924 */
da2ebce6 2925static __be32
d5184658
BF		 2926nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2927 struct svc_export *exp,
2928 struct dentry *dentry, u32 *bmval,
406a7ea9 2929 struct svc_rqst *rqstp, int ignore_crossmnt)
1da177e4
LT		 2930{
2931 u32 bmval0 = bmval[0];
2932 u32 bmval1 = bmval[1];
7e705706 2933 u32 bmval2 = bmval[2];
1da177e4 2934 struct kstat stat;
d50e6136 2935 struct svc_fh *tempfh = NULL;
1da177e4 2936 struct kstatfs statfs;
ab04de60 2937 __be32 *p, *attrlen_p;
1fcea5b2 2938 int starting_len = xdr->buf->len;
082d4bd7 2939 int attrlen_offset;
1da177e4
LT		 2940 u32 dummy;
2941 u64 dummy64;
42ca0993 2942 u32 rdattr_err = 0;
b37ad28b 2943 __be32 status;
b8dd7b9a 2944 int err;
1da177e4 2945 struct nfs4_acl *acl = NULL;
0ab88ca4 2946#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
18032ca0
DQ		 2947 void *context = NULL;
2948 int contextlen;
0ab88ca4 2949#endif
18032ca0 2950 bool contextsupport = false;
7e705706
AA		 2951 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2952 u32 minorversion = resp->cstate.minorversion;
ebabe9a9
CH		 2953 struct path path = {
2954 .mnt = exp->ex_path.mnt,
2955 .dentry = dentry,
2956 };
3d733711 2957 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1da177e4
LT		 2958
2959 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
916d2d84 2960 BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
1da177e4 2961
42ca0993 2962 if (exp->ex_fslocs.migrated) {
c2227a39 2963 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
42ca0993
BF		 2964 if (status)
2965 goto out;
2966 }
2967
638e3e7d
JL		 2968 err = vfs_getattr(&path, &stat,
2969 STATX_BASIC_STATS | STATX_BTIME | STATX_CHANGE_COOKIE,
2970 AT_STATX_SYNC_AS_STAT);
b8dd7b9a 2971 if (err)
1da177e4 2972 goto out_nfserr;
e377a3e6
OV		 2973 if (!(stat.result_mask & STATX_BTIME))
2974 /* underlying FS does not offer btime so we can't share it */
2975 bmval1 &= ~FATTR4_WORD1_TIME_CREATE;
12337901
CH		 2976 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2977 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
1da177e4
LT		 2978 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2979 FATTR4_WORD1_SPACE_TOTAL))) {
ebabe9a9 2980 err = vfs_statfs(&path, &statfs);
b8dd7b9a 2981 if (err)
1da177e4
LT		 2982 goto out_nfserr;
2983 }
2984 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
d50e6136
BF		 2985 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2986 status = nfserr_jukebox;
2987 if (!tempfh)
2988 goto out;
2989 fh_init(tempfh, NFS4_FHSIZE);
2990 status = fh_compose(tempfh, exp, dentry, NULL);
1da177e4
LT		 2991 if (status)
2992 goto out;
d50e6136 2993 fhp = tempfh;
1da177e4 2994 }
0c9d65e7 2995 if (bmval0 & FATTR4_WORD0_ACL) {
b8dd7b9a 2996 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
0c9d65e7
AG		 2997 if (err == -EOPNOTSUPP)
2998 bmval0 &= ~FATTR4_WORD0_ACL;
2999 else if (err == -EINVAL) {
3000 status = nfserr_attrnotsupp;
3001 goto out;
3002 } else if (err != 0)
3003 goto out_nfserr;
1da177e4 3004 }
1da177e4 3005
18032ca0 3006#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
c2227a39
KM		 3007 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
3008 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
32ddd944
BF		 3009 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
3010 err = security_inode_getsecctx(d_inode(dentry),
18032ca0 3011 &context, &contextlen);
32ddd944
BF		 3012 else
3013 err = -EOPNOTSUPP;
18032ca0
DQ		 3014 contextsupport = (err == 0);
3015 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
3016 if (err == -EOPNOTSUPP)
3017 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
3018 else if (err)
3019 goto out_nfserr;
3020 }
3021 }
3022#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3023
75976de6
KM		 3024 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
3025 if (status)
3026 goto out;
082d4bd7
BF		 3027
3028 attrlen_offset = xdr->buf->len;
ab04de60
CL		 3029 attrlen_p = xdr_reserve_space(xdr, XDR_UNIT);
3030 if (!attrlen_p)
ddd1ea56 3031 goto out_resource;
1da177e4
LT		 3032
3033 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
dcd20869
BF		 3034 u32 supp[3];
3035
3036 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
7e705706 3037
0c9d65e7 3038 if (!IS_POSIXACL(dentry->d_inode))
916d2d84 3039 supp[0] &= ~FATTR4_WORD0_ACL;
18032ca0 3040 if (!contextsupport)
916d2d84
BF		 3041 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3042 if (!supp[2]) {
ddd1ea56
BF		 3043 p = xdr_reserve_space(xdr, 12);
3044 if (!p)
2b44f1ba 3045 goto out_resource;
c373b0a4 3046 *p++ = cpu_to_be32(2);
916d2d84
BF		 3047 *p++ = cpu_to_be32(supp[0]);
3048 *p++ = cpu_to_be32(supp[1]);
7e705706 3049 } else {
ddd1ea56
BF		 3050 p = xdr_reserve_space(xdr, 16);
3051 if (!p)
2b44f1ba 3052 goto out_resource;
c373b0a4 3053 *p++ = cpu_to_be32(3);
916d2d84
BF		 3054 *p++ = cpu_to_be32(supp[0]);
3055 *p++ = cpu_to_be32(supp[1]);
3056 *p++ = cpu_to_be32(supp[2]);
7e705706 3057 }
1da177e4
LT		 3058 }
3059 if (bmval0 & FATTR4_WORD0_TYPE) {
ddd1ea56
BF		 3060 p = xdr_reserve_space(xdr, 4);
3061 if (!p)
1da177e4 3062 goto out_resource;
3d2544b1 3063 dummy = nfs4_file_type(stat.mode);
6b6d8137
BF		 3064 if (dummy == NF4BAD) {
3065 status = nfserr_serverfault;
3066 goto out;
3067 }
c373b0a4 3068 *p++ = cpu_to_be32(dummy);
1da177e4
LT		 3069 }
3070 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
ddd1ea56
BF		 3071 p = xdr_reserve_space(xdr, 4);
3072 if (!p)
1da177e4 3073 goto out_resource;
49640001 3074 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
c373b0a4 3075 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
49640001 3076 else
c373b0a4
BF		 3077 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
3078 NFS4_FH_VOL_RENAME);
1da177e4
LT		 3079 }
3080 if (bmval0 & FATTR4_WORD0_CHANGE) {
ddd1ea56
BF		 3081 p = xdr_reserve_space(xdr, 8);
3082 if (!p)
1da177e4 3083 goto out_resource;
b8800921 3084 p = encode_change(p, &stat, d_inode(dentry), exp);
1da177e4
LT		 3085 }
3086 if (bmval0 & FATTR4_WORD0_SIZE) {
ddd1ea56
BF		 3087 p = xdr_reserve_space(xdr, 8);
3088 if (!p)
1da177e4 3089 goto out_resource;
b64c7f3b 3090 p = xdr_encode_hyper(p, stat.size);
1da177e4
LT		 3091 }
3092 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
ddd1ea56
BF		 3093 p = xdr_reserve_space(xdr, 4);
3094 if (!p)
1da177e4 3095 goto out_resource;
c373b0a4 3096 *p++ = cpu_to_be32(1);
1da177e4
LT		 3097 }
3098 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
ddd1ea56
BF		 3099 p = xdr_reserve_space(xdr, 4);
3100 if (!p)
1da177e4 3101 goto out_resource;
c373b0a4 3102 *p++ = cpu_to_be32(1);
1da177e4
LT		 3103 }
3104 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
ddd1ea56
BF		 3105 p = xdr_reserve_space(xdr, 4);
3106 if (!p)
1da177e4 3107 goto out_resource;
c373b0a4 3108 *p++ = cpu_to_be32(0);
1da177e4
LT		 3109 }
3110 if (bmval0 & FATTR4_WORD0_FSID) {
ddd1ea56
BF		 3111 p = xdr_reserve_space(xdr, 16);
3112 if (!p)
1da177e4 3113 goto out_resource;
42ca0993 3114 if (exp->ex_fslocs.migrated) {
b64c7f3b
BF		 3115 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
3116 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
af6a4e28
N		 3117 } else switch(fsid_source(fhp)) {
3118 case FSIDSOURCE_FSID:
b64c7f3b
BF		 3119 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
3120 p = xdr_encode_hyper(p, (u64)0);
af6a4e28
N		 3121 break;
3122 case FSIDSOURCE_DEV:
c373b0a4
BF		 3123 *p++ = cpu_to_be32(0);
3124 *p++ = cpu_to_be32(MAJOR(stat.dev));
3125 *p++ = cpu_to_be32(0);
3126 *p++ = cpu_to_be32(MINOR(stat.dev));
af6a4e28
N		 3127 break;
3128 case FSIDSOURCE_UUID:
94eb3689
KM		 3129 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
3130 EX_UUID_LEN);
af6a4e28 3131 break;
1da177e4
LT		 3132 }
3133 }
3134 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
ddd1ea56
BF		 3135 p = xdr_reserve_space(xdr, 4);
3136 if (!p)
1da177e4 3137 goto out_resource;
c373b0a4 3138 *p++ = cpu_to_be32(0);
1da177e4
LT		 3139 }
3140 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
ddd1ea56
BF		 3141 p = xdr_reserve_space(xdr, 4);
3142 if (!p)
1da177e4 3143 goto out_resource;
c373b0a4 3144 *p++ = cpu_to_be32(nn->nfsd4_lease);
1da177e4
LT		 3145 }
3146 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
ddd1ea56
BF		 3147 p = xdr_reserve_space(xdr, 4);
3148 if (!p)
1da177e4 3149 goto out_resource;
c373b0a4 3150 *p++ = cpu_to_be32(rdattr_err);
1da177e4
LT		 3151 }
3152 if (bmval0 & FATTR4_WORD0_ACL) {
3153 struct nfs4_ace *ace;
1da177e4
LT		 3154
3155 if (acl == NULL) {
ddd1ea56
BF		 3156 p = xdr_reserve_space(xdr, 4);
3157 if (!p)
1da177e4
LT		 3158 goto out_resource;
3159
c373b0a4 3160 *p++ = cpu_to_be32(0);
1da177e4
LT		 3161 goto out_acl;
3162 }
ddd1ea56
BF		 3163 p = xdr_reserve_space(xdr, 4);
3164 if (!p)
1da177e4 3165 goto out_resource;
c373b0a4 3166 *p++ = cpu_to_be32(acl->naces);
1da177e4 3167
28e05dd8 3168 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
ddd1ea56
BF		 3169 p = xdr_reserve_space(xdr, 4*3);
3170 if (!p)
1da177e4 3171 goto out_resource;
c373b0a4
BF		 3172 *p++ = cpu_to_be32(ace->type);
3173 *p++ = cpu_to_be32(ace->flag);
3174 *p++ = cpu_to_be32(ace->access_mask &
3175 NFS4_ACE_MASK_ALL);
ddd1ea56 3176 status = nfsd4_encode_aclname(xdr, rqstp, ace);
1da177e4
LT		 3177 if (status)
3178 goto out;
3179 }
3180 }
3181out_acl:
3182 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
ddd1ea56
BF		 3183 p = xdr_reserve_space(xdr, 4);
3184 if (!p)
1da177e4 3185 goto out_resource;
0c9d65e7 3186 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
1da177e4
LT		 3187 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
3188 }
3189 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
ddd1ea56
BF		 3190 p = xdr_reserve_space(xdr, 4);
3191 if (!p)
1da177e4 3192 goto out_resource;
c373b0a4 3193 *p++ = cpu_to_be32(1);
1da177e4
LT		 3194 }
3195 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
ddd1ea56
BF		 3196 p = xdr_reserve_space(xdr, 4);
3197 if (!p)
1da177e4 3198 goto out_resource;
c373b0a4 3199 *p++ = cpu_to_be32(0);
1da177e4
LT		 3200 }
3201 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
ddd1ea56
BF		 3202 p = xdr_reserve_space(xdr, 4);
3203 if (!p)
1da177e4 3204 goto out_resource;
c373b0a4 3205 *p++ = cpu_to_be32(1);
1da177e4
LT		 3206 }
3207 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
ddd1ea56
BF		 3208 p = xdr_reserve_space(xdr, 4);
3209 if (!p)
1da177e4 3210 goto out_resource;
c373b0a4 3211 *p++ = cpu_to_be32(1);
1da177e4
LT		 3212 }
3213 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
ddd1ea56
BF		 3214 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
3215 if (!p)
1da177e4 3216 goto out_resource;
d8b26071 3217 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw,
0c0c267b 3218 fhp->fh_handle.fh_size);
1da177e4
LT		 3219 }
3220 if (bmval0 & FATTR4_WORD0_FILEID) {
ddd1ea56
BF		 3221 p = xdr_reserve_space(xdr, 8);
3222 if (!p)
1da177e4 3223 goto out_resource;
b64c7f3b 3224 p = xdr_encode_hyper(p, stat.ino);
1da177e4
LT		 3225 }
3226 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
ddd1ea56
BF		 3227 p = xdr_reserve_space(xdr, 8);
3228 if (!p)
1da177e4 3229 goto out_resource;
b64c7f3b 3230 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
1da177e4
LT		 3231 }
3232 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
ddd1ea56
BF		 3233 p = xdr_reserve_space(xdr, 8);
3234 if (!p)
1da177e4 3235 goto out_resource;
b64c7f3b 3236 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
1da177e4
LT		 3237 }
3238 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
ddd1ea56
BF		 3239 p = xdr_reserve_space(xdr, 8);
3240 if (!p)
1da177e4 3241 goto out_resource;
b64c7f3b 3242 p = xdr_encode_hyper(p, (u64) statfs.f_files);
1da177e4 3243 }
81c3f413 3244 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
ddd1ea56 3245 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
81c3f413
BF		 3246 if (status)
3247 goto out;
3248 }
1da177e4 3249 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
ddd1ea56
BF		 3250 p = xdr_reserve_space(xdr, 4);
3251 if (!p)
1da177e4 3252 goto out_resource;
c373b0a4 3253 *p++ = cpu_to_be32(1);
1da177e4
LT		 3254 }
3255 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
ddd1ea56
BF		 3256 p = xdr_reserve_space(xdr, 8);
3257 if (!p)
1da177e4 3258 goto out_resource;
b64c7f3b 3259 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
1da177e4
LT		 3260 }
3261 if (bmval0 & FATTR4_WORD0_MAXLINK) {
ddd1ea56
BF		 3262 p = xdr_reserve_space(xdr, 4);
3263 if (!p)
1da177e4 3264 goto out_resource;
c373b0a4 3265 *p++ = cpu_to_be32(255);
1da177e4
LT		 3266 }
3267 if (bmval0 & FATTR4_WORD0_MAXNAME) {
ddd1ea56
BF		 3268 p = xdr_reserve_space(xdr, 4);
3269 if (!p)
1da177e4 3270 goto out_resource;
c373b0a4 3271 *p++ = cpu_to_be32(statfs.f_namelen);
1da177e4
LT		 3272 }
3273 if (bmval0 & FATTR4_WORD0_MAXREAD) {
ddd1ea56
BF		 3274 p = xdr_reserve_space(xdr, 8);
3275 if (!p)
1da177e4 3276 goto out_resource;
b64c7f3b 3277 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
1da177e4
LT		 3278 }
3279 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
ddd1ea56
BF		 3280 p = xdr_reserve_space(xdr, 8);
3281 if (!p)
1da177e4 3282 goto out_resource;
b64c7f3b 3283 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
1da177e4
LT		 3284 }
3285 if (bmval1 & FATTR4_WORD1_MODE) {
ddd1ea56
BF		 3286 p = xdr_reserve_space(xdr, 4);
3287 if (!p)
1da177e4 3288 goto out_resource;
c373b0a4 3289 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
1da177e4
LT		 3290 }
3291 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
ddd1ea56
BF		 3292 p = xdr_reserve_space(xdr, 4);
3293 if (!p)
1da177e4 3294 goto out_resource;
c373b0a4 3295 *p++ = cpu_to_be32(1);
1da177e4
LT		 3296 }
3297 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
ddd1ea56
BF		 3298 p = xdr_reserve_space(xdr, 4);
3299 if (!p)
1da177e4 3300 goto out_resource;
c373b0a4 3301 *p++ = cpu_to_be32(stat.nlink);
1da177e4
LT		 3302 }
3303 if (bmval1 & FATTR4_WORD1_OWNER) {
ddd1ea56 3304 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
1da177e4
LT		 3305 if (status)
3306 goto out;
3307 }
3308 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
ddd1ea56 3309 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
1da177e4
LT		 3310 if (status)
3311 goto out;
3312 }
3313 if (bmval1 & FATTR4_WORD1_RAWDEV) {
ddd1ea56
BF		 3314 p = xdr_reserve_space(xdr, 8);
3315 if (!p)
1da177e4 3316 goto out_resource;
c373b0a4
BF		 3317 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
3318 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
1da177e4
LT		 3319 }
3320 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
ddd1ea56
BF		 3321 p = xdr_reserve_space(xdr, 8);
3322 if (!p)
1da177e4
LT		 3323 goto out_resource;
3324 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
b64c7f3b 3325 p = xdr_encode_hyper(p, dummy64);
1da177e4
LT		 3326 }
3327 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
ddd1ea56
BF		 3328 p = xdr_reserve_space(xdr, 8);
3329 if (!p)
1da177e4
LT		 3330 goto out_resource;
3331 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
b64c7f3b 3332 p = xdr_encode_hyper(p, dummy64);
1da177e4
LT		 3333 }
3334 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
ddd1ea56
BF		 3335 p = xdr_reserve_space(xdr, 8);
3336 if (!p)
1da177e4
LT		 3337 goto out_resource;
3338 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
b64c7f3b 3339 p = xdr_encode_hyper(p, dummy64);
1da177e4
LT		 3340 }
3341 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
ddd1ea56
BF		 3342 p = xdr_reserve_space(xdr, 8);
3343 if (!p)
1da177e4
LT		 3344 goto out_resource;
3345 dummy64 = (u64)stat.blocks << 9;
b64c7f3b 3346 p = xdr_encode_hyper(p, dummy64);
1da177e4
LT		 3347 }
3348 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
ddd1ea56
BF		 3349 p = xdr_reserve_space(xdr, 12);
3350 if (!p)
1da177e4 3351 goto out_resource;
b64c7f3b 3352 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
c373b0a4 3353 *p++ = cpu_to_be32(stat.atime.tv_nsec);
1da177e4
LT		 3354 }
3355 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
ddd1ea56
BF		 3356 p = xdr_reserve_space(xdr, 12);
3357 if (!p)
1da177e4 3358 goto out_resource;
16945141 3359 p = encode_time_delta(p, d_inode(dentry));
1da177e4
LT		 3360 }
3361 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
ddd1ea56
BF		 3362 p = xdr_reserve_space(xdr, 12);
3363 if (!p)
1da177e4 3364 goto out_resource;
b64c7f3b 3365 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
c373b0a4 3366 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
1da177e4
LT		 3367 }
3368 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
ddd1ea56
BF		 3369 p = xdr_reserve_space(xdr, 12);
3370 if (!p)
1da177e4 3371 goto out_resource;
b64c7f3b 3372 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
c373b0a4 3373 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
1da177e4 3374 }
e377a3e6
OV		 3375 if (bmval1 & FATTR4_WORD1_TIME_CREATE) {
3376 p = xdr_reserve_space(xdr, 12);
3377 if (!p)
3378 goto out_resource;
3379 p = xdr_encode_hyper(p, (s64)stat.btime.tv_sec);
3380 *p++ = cpu_to_be32(stat.btime.tv_nsec);
3381 }
1da177e4 3382 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
0a2050d7
KM		 3383 u64 ino = stat.ino;
3384
ddd1ea56
BF		 3385 p = xdr_reserve_space(xdr, 8);
3386 if (!p)
1da177e4 3387 goto out_resource;
406a7ea9 3388 /*
6106d911
JL		 3389 * Get ino of mountpoint in parent filesystem, if not ignoring
3390 * crossmount and this is the root of a cross-mounted
3391 * filesystem.
406a7ea9
FF		 3392 */
3393 if (ignore_crossmnt == 0 &&
0a2050d7 3394 dentry == exp->ex_path.mnt->mnt_root) {
6106d911 3395 err = nfsd4_get_mounted_on_ino(exp, &ino);
0a2050d7
KM		 3396 if (err)
3397 goto out_nfserr;
0a2050d7
KM		 3398 }
3399 p = xdr_encode_hyper(p, ino);
1da177e4 3400 }
9cf514cc 3401#ifdef CONFIG_NFSD_PNFS
6896f15a 3402 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
8a4c3926 3403 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
6896f15a
KM		 3404 if (status)
3405 goto out;
3406 }
3407
3408 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
8a4c3926 3409 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
6896f15a
KM		 3410 if (status)
3411 goto out;
9cf514cc
CH		 3412 }
3413
3414 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
3415 p = xdr_reserve_space(xdr, 4);
3416 if (!p)
3417 goto out_resource;
3418 *p++ = cpu_to_be32(stat.blksize);
3419 }
3420#endif /* CONFIG_NFSD_PNFS */
8c18f205 3421 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
b26b78cb
TM		 3422 u32 supp[3];
3423
3424 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
3425 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
3426 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
3427 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
3428
3429 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
75976de6
KM		 3430 if (status)
3431 goto out;
8c18f205 3432 }
7e705706 3433
0ab88ca4 3434#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
7d580722
KM		 3435 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
3436 status = nfsd4_encode_security_label(xdr, rqstp, context,
3437 contextlen);
3438 if (status)
3439 goto out;
3440 }
0ab88ca4 3441#endif
7d580722 3442
0e885e84
FL		 3443 if (bmval2 & FATTR4_WORD2_XATTR_SUPPORT) {
3444 p = xdr_reserve_space(xdr, 4);
3445 if (!p)
3446 goto out_resource;
831be973 3447 err = xattr_supports_user_prefix(d_inode(dentry));
0e885e84
FL		 3448 *p++ = cpu_to_be32(err == 0);
3449 }
3450
ab04de60 3451 *attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT);
1da177e4
LT		 3452 status = nfs_ok;
3453
3454out:
ba4e55bb 3455#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
18032ca0
DQ		 3456 if (context)
3457 security_release_secctx(context, contextlen);
ba4e55bb 3458#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
28e05dd8 3459 kfree(acl);
18df11d0 3460 if (tempfh) {
d50e6136 3461 fh_put(tempfh);
18df11d0
YZ		 3462 kfree(tempfh);
3463 }
1fcea5b2
BF		 3464 if (status)
3465 xdr_truncate_encode(xdr, starting_len);
1da177e4
LT		 3466 return status;
3467out_nfserr:
b8dd7b9a 3468 status = nfserrno(err);
1da177e4
LT		 3469 goto out;
3470out_resource:
1da177e4
LT		 3471 status = nfserr_resource;
3472 goto out;
1da177e4
LT		 3473}
3474
2825a7f9
BF		 3475static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3476 struct xdr_buf *buf, __be32 *p, int bytes)
3477{
3478 xdr->scratch.iov_len = 0;
3479 memset(buf, 0, sizeof(struct xdr_buf));
3480 buf->head[0].iov_base = p;
3481 buf->head[0].iov_len = 0;
3482 buf->len = 0;
3483 xdr->buf = buf;
3484 xdr->iov = buf->head;
3485 xdr->p = p;
3486 xdr->end = (void *)p + bytes;
3487 buf->buflen = bytes;
3488}
3489
d5184658
BF		 3490__be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3491 struct svc_fh *fhp, struct svc_export *exp,
3492 struct dentry *dentry, u32 *bmval,
3493 struct svc_rqst *rqstp, int ignore_crossmnt)
3494{
2825a7f9 3495 struct xdr_buf dummy;
d5184658
BF		 3496 struct xdr_stream xdr;
3497 __be32 ret;
3498
2825a7f9 3499 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
d5184658
BF		 3500 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
3501 ignore_crossmnt);
3502 *p = xdr.p;
3503 return ret;
3504}
3505
c0ce6ec8
BF		 3506static inline int attributes_need_mount(u32 *bmval)
3507{
3508 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3509 return 1;
3510 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3511 return 1;
3512 return 0;
3513}
3514
b37ad28b 3515static __be32
561f0ed4
BF		 3516nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
3517 const char *name, int namlen)
1da177e4
LT		 3518{
3519 struct svc_export *exp = cd->rd_fhp->fh_export;
3520 struct dentry *dentry;
b37ad28b 3521 __be32 nfserr;
406a7ea9 3522 int ignore_crossmnt = 0;
1da177e4 3523
6c2d4798 3524 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
1da177e4
LT		 3525 if (IS_ERR(dentry))
3526 return nfserrno(PTR_ERR(dentry));
3527
3528 exp_get(exp);
406a7ea9
FF		 3529 /*
3530 * In the case of a mountpoint, the client may be asking for
3531 * attributes that are only properties of the underlying filesystem
3532 * as opposed to the cross-mounted file system. In such a case,
3533 * we will not follow the cross mount and will fill the attribtutes
3534 * directly from the mountpoint dentry.
3535 */
3227fa41 3536 if (nfsd_mountpoint(dentry, exp)) {
021d3a72
BF		 3537 int err;
3538
3227fa41
BF		 3539 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3540 && !attributes_need_mount(cd->rd_bmval)) {
3541 ignore_crossmnt = 1;
3542 goto out_encode;
3543 }
dcb488a3
AA		 3544 /*
3545 * Why the heck aren't we just using nfsd_lookup??
3546 * Different "."/".." handling? Something else?
3547 * At least, add a comment here to explain....
3548 */
021d3a72
BF		 3549 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3550 if (err) {
3551 nfserr = nfserrno(err);
1da177e4
LT		 3552 goto out_put;
3553 }
dcb488a3
AA		 3554 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3555 if (nfserr)
3556 goto out_put;
1da177e4
LT		 3557
3558 }
3227fa41 3559out_encode:
561f0ed4 3560 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
406a7ea9 3561 cd->rd_rqstp, ignore_crossmnt);
1da177e4
LT		 3562out_put:
3563 dput(dentry);
3564 exp_put(exp);
3565 return nfserr;
3566}
3567
2ebbc012 3568static __be32 *
561f0ed4 3569nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
1da177e4 3570{
561f0ed4
BF		 3571 __be32 *p;
3572
c3a45617 3573 p = xdr_reserve_space(xdr, 20);
561f0ed4 3574 if (!p)
1da177e4
LT		 3575 return NULL;
3576 *p++ = htonl(2);
3577 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3578 *p++ = htonl(0); /* bmval1 */
3579
87915c64 3580 *p++ = htonl(4); /* attribute length */
1da177e4 3581 *p++ = nfserr; /* no htonl */
1da177e4
LT		 3582 return p;
3583}
3584
3585static int
a0ad13ef
N		 3586nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3587 loff_t offset, u64 ino, unsigned int d_type)
1da177e4 3588{
a0ad13ef 3589 struct readdir_cd *ccd = ccdv;
1da177e4 3590 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
561f0ed4
BF		 3591 struct xdr_stream *xdr = cd->xdr;
3592 int start_offset = xdr->buf->len;
3593 int cookie_offset;
aee37764 3594 u32 name_and_cookie;
561f0ed4 3595 int entry_bytes;
b37ad28b 3596 __be32 nfserr = nfserr_toosmall;
561f0ed4
BF		 3597 __be64 wire_offset;
3598 __be32 *p;
1da177e4
LT		 3599
3600 /* In nfsv4, "." and ".." never make it onto the wire.. */
3601 if (name && isdotent(name, namlen)) {
3602 cd->common.err = nfs_ok;
3603 return 0;
3604 }
3605
561f0ed4
BF		 3606 if (cd->cookie_offset) {
3607 wire_offset = cpu_to_be64(offset);
3608 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3609 &wire_offset, 8);
3610 }
1da177e4 3611
561f0ed4
BF		 3612 p = xdr_reserve_space(xdr, 4);
3613 if (!p)
1da177e4 3614 goto fail;
1da177e4 3615 *p++ = xdr_one; /* mark entry present */
561f0ed4
BF		 3616 cookie_offset = xdr->buf->len;
3617 p = xdr_reserve_space(xdr, 3*4 + namlen);
3618 if (!p)
3619 goto fail;
c306d737 3620 p = xdr_encode_hyper(p, OFFSET_MAX); /* offset of next entry */
1da177e4
LT		 3621 p = xdr_encode_array(p, name, namlen); /* name length & name */
3622
561f0ed4 3623 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
1da177e4
LT		 3624 switch (nfserr) {
3625 case nfs_ok:
1da177e4
LT		 3626 break;
3627 case nfserr_resource:
3628 nfserr = nfserr_toosmall;
3629 goto fail;
b2c0cea6 3630 case nfserr_noent:
f41c5ad2 3631 xdr_truncate_encode(xdr, start_offset);
b2c0cea6 3632 goto skip_entry;
cad85337
JL		 3633 case nfserr_jukebox:
3634 /*
3635 * The pseudoroot should only display dentries that lead to
3636 * exports. If we get EJUKEBOX here, then we can't tell whether
3637 * this entry should be included. Just fail the whole READDIR
3638 * with NFS4ERR_DELAY in that case, and hope that the situation
3639 * will resolve itself by the client's next attempt.
3640 */
3641 if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT)
3642 goto fail;
3643 fallthrough;
1da177e4
LT		 3644 default:
3645 /*
3646 * If the client requested the RDATTR_ERROR attribute,
3647 * we stuff the error code into this attribute
3648 * and continue. If this attribute was not requested,
3649 * then in accordance with the spec, we fail the
3650 * entire READDIR operation(!)
3651 */
3652 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3653 goto fail;
561f0ed4 3654 p = nfsd4_encode_rdattr_error(xdr, nfserr);
34081efc
FI		 3655 if (p == NULL) {
3656 nfserr = nfserr_toosmall;
1da177e4 3657 goto fail;
34081efc 3658 }
1da177e4 3659 }
561f0ed4
BF		 3660 nfserr = nfserr_toosmall;
3661 entry_bytes = xdr->buf->len - start_offset;
3662 if (entry_bytes > cd->rd_maxcount)
3663 goto fail;
3664 cd->rd_maxcount -= entry_bytes;
aee37764 3665 /*
f2e717d6
TM		 3666 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and
3667 * notes that it could be zero. If it is zero, then the server
3668 * should enforce only the rd_maxcount value.
aee37764 3669 */
f2e717d6
TM		 3670 if (cd->rd_dircount) {
3671 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3672 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3673 goto fail;
3674 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3675 if (!cd->rd_dircount)
3676 cd->rd_maxcount = 0;
3677 }
0ec016e3 3678
561f0ed4 3679 cd->cookie_offset = cookie_offset;
b2c0cea6 3680skip_entry:
1da177e4
LT		 3681 cd->common.err = nfs_ok;
3682 return 0;
3683fail:
561f0ed4 3684 xdr_truncate_encode(xdr, start_offset);
1da177e4
LT		 3685 cd->common.err = nfserr;
3686 return -EINVAL;
3687}
3688
d0a381dd
BF		 3689static __be32
3690nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
e2f282b9 3691{
bc749ca4 3692 __be32 *p;
e2f282b9 3693
d0a381dd
BF		 3694 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3695 if (!p)
3696 return nfserr_resource;
c373b0a4 3697 *p++ = cpu_to_be32(sid->si_generation);
0c0c267b
BF		 3698 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3699 sizeof(stateid_opaque_t));
d0a381dd 3700 return 0;
e2f282b9
BH		 3701}
3702
695e12f8 3703static __be32
e78e274e
KC		 3704nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr,
3705 union nfsd4_op_u *u)
1da177e4 3706{
e78e274e 3707 struct nfsd4_access *access = &u->access;
bddfdbcd 3708 struct xdr_stream *xdr = resp->xdr;
bc749ca4 3709 __be32 *p;
1da177e4 3710
bac966d6
BF		 3711 p = xdr_reserve_space(xdr, 8);
3712 if (!p)
3713 return nfserr_resource;
3714 *p++ = cpu_to_be32(access->ac_supported);
3715 *p++ = cpu_to_be32(access->ac_resp_access);
3716 return 0;
1da177e4
LT		 3717}
3718
e78e274e
KC		 3719static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3720 union nfsd4_op_u *u)
1d1bc8f2 3721{
e78e274e 3722 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
bddfdbcd 3723 struct xdr_stream *xdr = resp->xdr;
1d1bc8f2
BF		 3724 __be32 *p;
3725
bac966d6
BF		 3726 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3727 if (!p)
3728 return nfserr_resource;
3729 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3730 NFS4_MAX_SESSIONID_LEN);
3731 *p++ = cpu_to_be32(bcts->dir);
3732 /* Upshifting from TCP to RDMA is not supported */
3733 *p++ = cpu_to_be32(0);
3734 return 0;
1d1bc8f2
BF		 3735}
3736
695e12f8 3737static __be32
e78e274e
KC		 3738nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr,
3739 union nfsd4_op_u *u)
1da177e4 3740{
e78e274e 3741 struct nfsd4_close *close = &u->close;
bddfdbcd 3742 struct xdr_stream *xdr = resp->xdr;
d0a381dd 3743
bac966d6 3744 return nfsd4_encode_stateid(xdr, &close->cl_stateid);
1da177e4
LT		 3745}
3746
3747
695e12f8 3748static __be32
e78e274e
KC		 3749nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr,
3750 union nfsd4_op_u *u)
1da177e4 3751{
e78e274e 3752 struct nfsd4_commit *commit = &u->commit;
bddfdbcd 3753 struct xdr_stream *xdr = resp->xdr;
bc749ca4 3754 __be32 *p;
1da177e4 3755
bac966d6
BF		 3756 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3757 if (!p)
3758 return nfserr_resource;
3759 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
0c0c267b 3760 NFS4_VERIFIER_SIZE);
bac966d6 3761 return 0;
1da177e4
LT		 3762}
3763
695e12f8 3764static __be32
e78e274e
KC		 3765nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr,
3766 union nfsd4_op_u *u)
1da177e4 3767{
e78e274e 3768 struct nfsd4_create *create = &u->create;
bddfdbcd 3769 struct xdr_stream *xdr = resp->xdr;
bc749ca4 3770 __be32 *p;
1da177e4 3771
bac966d6
BF		 3772 p = xdr_reserve_space(xdr, 20);
3773 if (!p)
3774 return nfserr_resource;
3775 encode_cinfo(p, &create->cr_cinfo);
b96811cd 3776 return nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
bac966d6 3777 create->cr_bmval[1], create->cr_bmval[2]);
1da177e4
LT		 3778}
3779
b37ad28b 3780static __be32
e78e274e
KC		 3781nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr,
3782 union nfsd4_op_u *u)
1da177e4 3783{
e78e274e 3784 struct nfsd4_getattr *getattr = &u->getattr;
1da177e4 3785 struct svc_fh *fhp = getattr->ga_fhp;
bddfdbcd 3786 struct xdr_stream *xdr = resp->xdr;
1da177e4 3787
bac966d6
BF		 3788 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3789 getattr->ga_bmval, resp->rqstp, 0);
1da177e4
LT		 3790}
3791
695e12f8 3792static __be32
e78e274e
KC		 3793nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr,
3794 union nfsd4_op_u *u)
1da177e4 3795{
e78e274e 3796 struct svc_fh **fhpp = &u->getfh;
bddfdbcd 3797 struct xdr_stream *xdr = resp->xdr;
695e12f8 3798 struct svc_fh *fhp = *fhpp;
1da177e4 3799 unsigned int len;
bc749ca4 3800 __be32 *p;
1da177e4 3801
bac966d6
BF		 3802 len = fhp->fh_handle.fh_size;
3803 p = xdr_reserve_space(xdr, len + 4);
3804 if (!p)
3805 return nfserr_resource;
d8b26071 3806 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, len);
bac966d6 3807 return 0;
1da177e4
LT		 3808}
3809
3810/*
3811* Including all fields other than the name, a LOCK4denied structure requires
3812* 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3813*/
d0a381dd
BF		 3814static __be32
3815nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
1da177e4 3816{
7c13f344 3817 struct xdr_netobj *conf = &ld->ld_owner;
bc749ca4 3818 __be32 *p;
1da177e4 3819
8c7424cf 3820again:
d0a381dd 3821 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
8c7424cf
BF		 3822 if (!p) {
3823 /*
3824 * Don't fail to return the result just because we can't
3825 * return the conflicting open:
3826 */
3827 if (conf->len) {
f98bac5a 3828 kfree(conf->data);
8c7424cf
BF		 3829 conf->len = 0;
3830 conf->data = NULL;
3831 goto again;
3832 }
d0a381dd 3833 return nfserr_resource;
8c7424cf 3834 }
b64c7f3b
BF		 3835 p = xdr_encode_hyper(p, ld->ld_start);
3836 p = xdr_encode_hyper(p, ld->ld_length);
c373b0a4 3837 *p++ = cpu_to_be32(ld->ld_type);
7c13f344 3838 if (conf->len) {
0c0c267b
BF		 3839 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3840 p = xdr_encode_opaque(p, conf->data, conf->len);
f98bac5a 3841 kfree(conf->data);
1da177e4 3842 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
b64c7f3b 3843 p = xdr_encode_hyper(p, (u64)0); /* clientid */
c373b0a4 3844 *p++ = cpu_to_be32(0); /* length of owner name */
1da177e4 3845 }
d0a381dd 3846 return nfserr_denied;
1da177e4
LT		 3847}
3848
695e12f8 3849static __be32
e78e274e
KC		 3850nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr,
3851 union nfsd4_op_u *u)
1da177e4 3852{
e78e274e 3853 struct nfsd4_lock *lock = &u->lock;
bddfdbcd 3854 struct xdr_stream *xdr = resp->xdr;
d0a381dd 3855
e2f282b9 3856 if (!nfserr)
d0a381dd 3857 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
e2f282b9 3858 else if (nfserr == nfserr_denied)
d0a381dd 3859 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
f98bac5a 3860
695e12f8 3861 return nfserr;
1da177e4
LT		 3862}
3863
695e12f8 3864static __be32
e78e274e
KC		 3865nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr,
3866 union nfsd4_op_u *u)
1da177e4 3867{
e78e274e 3868 struct nfsd4_lockt *lockt = &u->lockt;
bddfdbcd 3869 struct xdr_stream *xdr = resp->xdr;
d0a381dd 3870
1da177e4 3871 if (nfserr == nfserr_denied)
d0a381dd 3872 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
695e12f8 3873 return nfserr;
1da177e4
LT		 3874}
3875
695e12f8 3876static __be32
e78e274e
KC		 3877nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr,
3878 union nfsd4_op_u *u)
1da177e4 3879{
e78e274e 3880 struct nfsd4_locku *locku = &u->locku;
bddfdbcd 3881 struct xdr_stream *xdr = resp->xdr;
d0a381dd 3882
bac966d6 3883 return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
1da177e4
LT		 3884}
3885
3886
695e12f8 3887static __be32
e78e274e
KC		 3888nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr,
3889 union nfsd4_op_u *u)
1da177e4 3890{
e78e274e 3891 struct nfsd4_link *link = &u->link;
bddfdbcd 3892 struct xdr_stream *xdr = resp->xdr;
bc749ca4 3893 __be32 *p;
1da177e4 3894
bac966d6
BF		 3895 p = xdr_reserve_space(xdr, 20);
3896 if (!p)
3897 return nfserr_resource;
3898 p = encode_cinfo(p, &link->li_cinfo);
3899 return 0;
1da177e4
LT		 3900}
3901
3902
695e12f8 3903static __be32
e78e274e
KC		 3904nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr,
3905 union nfsd4_op_u *u)
1da177e4 3906{
e78e274e 3907 struct nfsd4_open *open = &u->open;
bddfdbcd 3908 struct xdr_stream *xdr = resp->xdr;
bc749ca4 3909 __be32 *p;
1da177e4 3910
d0a381dd
BF		 3911 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3912 if (nfserr)
bac966d6 3913 return nfserr;
75976de6 3914 p = xdr_reserve_space(xdr, 24);
d0a381dd
BF		 3915 if (!p)
3916 return nfserr_resource;
d05d5744 3917 p = encode_cinfo(p, &open->op_cinfo);
c373b0a4 3918 *p++ = cpu_to_be32(open->op_rflags);
1da177e4 3919
75976de6
KM		 3920 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3921 open->op_bmval[2]);
3922 if (nfserr)
bac966d6 3923 return nfserr;
75976de6
KM		 3924
3925 p = xdr_reserve_space(xdr, 4);
3926 if (!p)
3927 return nfserr_resource;
3928
3929 *p++ = cpu_to_be32(open->op_delegate_type);
1da177e4
LT		 3930 switch (open->op_delegate_type) {
3931 case NFS4_OPEN_DELEGATE_NONE:
3932 break;
3933 case NFS4_OPEN_DELEGATE_READ:
d0a381dd
BF		 3934 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3935 if (nfserr)
3936 return nfserr;
3937 p = xdr_reserve_space(xdr, 20);
3938 if (!p)
3939 return nfserr_resource;
c373b0a4 3940 *p++ = cpu_to_be32(open->op_recall);
1da177e4
LT		 3941
3942 /*
3943 * TODO: ACE's in delegations
3944 */
c373b0a4
BF		 3945 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3946 *p++ = cpu_to_be32(0);
3947 *p++ = cpu_to_be32(0);
3948 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
1da177e4
LT		 3949 break;
3950 case NFS4_OPEN_DELEGATE_WRITE:
d0a381dd
BF		 3951 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3952 if (nfserr)
3953 return nfserr;
3954 p = xdr_reserve_space(xdr, 32);
3955 if (!p)
3956 return nfserr_resource;
c373b0a4 3957 *p++ = cpu_to_be32(0);
1da177e4
LT		 3958
3959 /*
3960 * TODO: space_limit's in delegations
3961 */
c373b0a4
BF		 3962 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3963 *p++ = cpu_to_be32(~(u32)0);
3964 *p++ = cpu_to_be32(~(u32)0);
1da177e4
LT		 3965
3966 /*
3967 * TODO: ACE's in delegations
3968 */
c373b0a4
BF		 3969 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3970 *p++ = cpu_to_be32(0);
3971 *p++ = cpu_to_be32(0);
3972 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
1da177e4 3973 break;
d24433cd
BH		 3974 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3975 switch (open->op_why_no_deleg) {
3976 case WND4_CONTENTION:
3977 case WND4_RESOURCE:
d0a381dd
BF		 3978 p = xdr_reserve_space(xdr, 8);
3979 if (!p)
3980 return nfserr_resource;
c373b0a4
BF		 3981 *p++ = cpu_to_be32(open->op_why_no_deleg);
3982 /* deleg signaling not supported yet: */
3983 *p++ = cpu_to_be32(0);
d24433cd
BH		 3984 break;
3985 default:
d0a381dd
BF		 3986 p = xdr_reserve_space(xdr, 4);
3987 if (!p)
3988 return nfserr_resource;
c373b0a4 3989 *p++ = cpu_to_be32(open->op_why_no_deleg);
d24433cd 3990 }
d24433cd 3991 break;
1da177e4
LT		 3992 default:
3993 BUG();
3994 }
3995 /* XXX save filehandle here */
bac966d6 3996 return 0;
1da177e4
LT		 3997}
3998
695e12f8 3999static __be32
e78e274e
KC		 4000nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr,
4001 union nfsd4_op_u *u)
1da177e4 4002{
e78e274e 4003 struct nfsd4_open_confirm *oc = &u->open_confirm;
bddfdbcd 4004 struct xdr_stream *xdr = resp->xdr;
d0a381dd 4005
bac966d6 4006 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
1da177e4
LT		 4007}
4008
695e12f8 4009static __be32
e78e274e
KC		 4010nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr,
4011 union nfsd4_op_u *u)
1da177e4 4012{
e78e274e 4013 struct nfsd4_open_downgrade *od = &u->open_downgrade;
bddfdbcd 4014 struct xdr_stream *xdr = resp->xdr;
d0a381dd 4015
bac966d6 4016 return nfsd4_encode_stateid(xdr, &od->od_stateid);
1da177e4
LT		 4017}
4018
dc97618d
BF		 4019static __be32 nfsd4_encode_splice_read(
4020 struct nfsd4_compoundres *resp,
4021 struct nfsd4_read *read,
4022 struct file *file, unsigned long maxcount)
1da177e4 4023{
bddfdbcd 4024 struct xdr_stream *xdr = resp->xdr;
34a78b48 4025 struct xdr_buf *buf = xdr->buf;
76e5492b 4026 int status, space_left;
dc97618d 4027 __be32 nfserr;
1da177e4 4028
d5d5c304
KM		 4029 /* Make sure there will be room for padding if needed */
4030 if (xdr->end - xdr->p < 1)
d0a381dd 4031 return nfserr_resource;
dc97618d 4032
87c5942e 4033 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
24c7fb85
CL		 4034 file, read->rd_offset, &maxcount,
4035 &read->rd_eof);
87c5942e 4036 read->rd_length = maxcount;
76e5492b
CL		 4037 if (nfserr)
4038 goto out_err;
4039 status = svc_encode_result_payload(read->rd_rqstp,
4040 buf->head[0].iov_len, maxcount);
4041 if (status) {
4042 nfserr = nfserrno(status);
4043 goto out_err;
b0e35fda 4044 }
1da177e4 4045
34a78b48
BF		 4046 buf->page_len = maxcount;
4047 buf->len += maxcount;
15b23ef5
BF		 4048 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
4049 / PAGE_SIZE;
dc97618d
BF		 4050
4051 /* Use rest of head for padding and remaining ops: */
34a78b48
BF		 4052 buf->tail[0].iov_base = xdr->p;
4053 buf->tail[0].iov_len = 0;
fec25fa4 4054 xdr->iov = buf->tail;
dc97618d 4055 if (maxcount&3) {
fec25fa4
BF		 4056 int pad = 4 - (maxcount&3);
4057
4058 *(xdr->p++) = 0;
4059
34a78b48 4060 buf->tail[0].iov_base += maxcount&3;
fec25fa4
BF		 4061 buf->tail[0].iov_len = pad;
4062 buf->len += pad;
b0e35fda 4063 }
2825a7f9 4064
dc97618d 4065 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
34a78b48
BF		 4066 buf->buflen - buf->len);
4067 buf->buflen = buf->len + space_left;
dc97618d
BF		 4068 xdr->end = (__be32 *)((void *)xdr->end + space_left);
4069
4070 return 0;
76e5492b
CL		 4071
4072out_err:
4073 /*
4074 * nfsd_splice_actor may have already messed with the
4075 * page length; reset it so as not to confuse
4076 * xdr_truncate_encode in our caller.
4077 */
4078 buf->page_len = 0;
4079 return nfserr;
dc97618d
BF		 4080}
4081
4082static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
4083 struct nfsd4_read *read,
4084 struct file *file, unsigned long maxcount)
4085{
bddfdbcd 4086 struct xdr_stream *xdr = resp->xdr;
071ae99f 4087 unsigned int starting_len = xdr->buf->len;
5e64d85c 4088 __be32 zero = xdr_zero;
dc97618d 4089 __be32 nfserr;
1da177e4 4090
403217f3
AS		 4091 read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, maxcount);
4092 if (read->rd_vlen < 0)
4093 return nfserr_resource;
1da177e4 4094
87c5942e 4095 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
83a63072 4096 resp->rqstp->rq_vec, read->rd_vlen, &maxcount,
24c7fb85 4097 &read->rd_eof);
87c5942e 4098 read->rd_length = maxcount;
dc97618d 4099 if (nfserr)
1da177e4 4100 return nfserr;
071ae99f 4101 if (svc_encode_result_payload(resp->rqstp, starting_len, maxcount))
41205539 4102 return nfserr_io;
071ae99f 4103 xdr_truncate_encode(xdr, starting_len + xdr_align_size(maxcount));
dc97618d 4104
5e64d85c
CL		 4105 write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero,
4106 xdr_pad_size(maxcount));
4107 return nfs_ok;
dc97618d
BF		 4108}
4109
4110static __be32
4111nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 4112 union nfsd4_op_u *u)
dc97618d 4113{
e78e274e 4114 struct nfsd4_read *read = &u->read;
c738b218 4115 bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags);
dc97618d 4116 unsigned long maxcount;
bddfdbcd 4117 struct xdr_stream *xdr = resp->xdr;
5c4583b2 4118 struct file *file;
dc97618d 4119 int starting_len = xdr->buf->len;
dc97618d 4120 __be32 *p;
dc97618d 4121
5c4583b2
JL		 4122 if (nfserr)
4123 return nfserr;
4124 file = read->rd_nf->nf_file;
4125
dc97618d
BF		 4126 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
4127 if (!p) {
c738b218 4128 WARN_ON_ONCE(splice_ok);
bac966d6 4129 return nfserr_resource;
dc97618d 4130 }
c738b218 4131 if (resp->xdr->buf->page_len && splice_ok) {
b0420980 4132 WARN_ON_ONCE(1);
06981d56 4133 return nfserr_serverfault;
dc97618d 4134 }
dc97618d
BF		 4135 xdr_commit_encode(xdr);
4136
0cb4d23a 4137 maxcount = min_t(unsigned long, read->rd_length,
68e8bb03 4138 (xdr->buf->buflen - xdr->buf->len));
dc97618d 4139
c738b218 4140 if (file->f_op->splice_read && splice_ok)
96bcad50 4141 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
dc97618d 4142 else
96bcad50 4143 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
28d5bc46 4144 if (nfserr) {
dc97618d 4145 xdr_truncate_encode(xdr, starting_len);
28d5bc46
CL		 4146 return nfserr;
4147 }
96bcad50 4148
28d5bc46
CL		 4149 p = xdr_encode_bool(p, read->rd_eof);
4150 *p = cpu_to_be32(read->rd_length);
4151 return nfs_ok;
1da177e4
LT		 4152}
4153
b37ad28b 4154static __be32
e78e274e
KC		 4155nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr,
4156 union nfsd4_op_u *u)
1da177e4 4157{
e78e274e 4158 struct nfsd4_readlink *readlink = &u->readlink;
99b002a1 4159 __be32 *p, *maxcount_p, zero = xdr_zero;
bddfdbcd 4160 struct xdr_stream *xdr = resp->xdr;
1fcea5b2 4161 int length_offset = xdr->buf->len;
99b002a1 4162 int maxcount, status;
1da177e4 4163
99b002a1
CL		 4164 maxcount_p = xdr_reserve_space(xdr, XDR_UNIT);
4165 if (!maxcount_p)
2825a7f9 4166 return nfserr_resource;
1da177e4 4167 maxcount = PAGE_SIZE;
d0a381dd 4168
476a7b1f
BF		 4169 p = xdr_reserve_space(xdr, maxcount);
4170 if (!p)
4e21ac4b 4171 return nfserr_resource;
1da177e4 4172 /*
fd4a0edf
MS		 4173 * XXX: By default, vfs_readlink() will truncate symlinks if they
4174 * would overflow the buffer. Is this kosher in NFSv4? If not, one
4175 * easy fix is: if vfs_readlink() precisely fills the buffer, assume
4176 * that truncation occurred, and return NFS4ERR_RESOURCE.
1da177e4 4177 */
476a7b1f
BF		 4178 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
4179 (char *)p, &maxcount);
1da177e4 4180 if (nfserr == nfserr_isdir)
d3f627c8 4181 nfserr = nfserr_inval;
76e5492b
CL		 4182 if (nfserr)
4183 goto out_err;
4184 status = svc_encode_result_payload(readlink->rl_rqstp, length_offset,
4185 maxcount);
4186 if (status) {
4187 nfserr = nfserrno(status);
4188 goto out_err;
d3f627c8 4189 }
99b002a1
CL		 4190 *maxcount_p = cpu_to_be32(maxcount);
4191 xdr_truncate_encode(xdr, length_offset + 4 + xdr_align_size(maxcount));
4192 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero,
4193 xdr_pad_size(maxcount));
4194 return nfs_ok;
76e5492b
CL		 4195
4196out_err:
4197 xdr_truncate_encode(xdr, length_offset);
4198 return nfserr;
1da177e4
LT		 4199}
4200
b37ad28b 4201static __be32
e78e274e
KC		 4202nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr,
4203 union nfsd4_op_u *u)
1da177e4 4204{
e78e274e 4205 struct nfsd4_readdir *readdir = &u->readdir;
1da177e4 4206 int maxcount;
561f0ed4 4207 int bytes_left;
1da177e4 4208 loff_t offset;
561f0ed4 4209 __be64 wire_offset;
bddfdbcd 4210 struct xdr_stream *xdr = resp->xdr;
1fcea5b2 4211 int starting_len = xdr->buf->len;
bc749ca4 4212 __be32 *p;
1da177e4 4213
d0a381dd
BF		 4214 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
4215 if (!p)
4216 return nfserr_resource;
1da177e4
LT		 4217
4218 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
c373b0a4
BF		 4219 *p++ = cpu_to_be32(0);
4220 *p++ = cpu_to_be32(0);
bddfdbcd
CL		 4221 xdr->buf->head[0].iov_len = (char *)xdr->p -
4222 (char *)xdr->buf->head[0].iov_base;
1da177e4
LT		 4223
4224 /*
561f0ed4
BF		 4225 * Number of bytes left for directory entries allowing for the
4226 * final 8 bytes of the readdir and a following failed op:
4227 */
4228 bytes_left = xdr->buf->buflen - xdr->buf->len
4229 - COMPOUND_ERR_SLACK_SPACE - 8;
4230 if (bytes_left < 0) {
4231 nfserr = nfserr_resource;
4232 goto err_no_verf;
4233 }
9c2ece6e
SM		 4234 maxcount = svc_max_payload(resp->rqstp);
4235 maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
561f0ed4
BF		 4236 /*
4237 * Note the rfc defines rd_maxcount as the size of the
4238 * READDIR4resok structure, which includes the verifier above
4239 * and the 8 bytes encoded at the end of this function:
1da177e4 4240 */
561f0ed4
BF		 4241 if (maxcount < 16) {
4242 nfserr = nfserr_toosmall;
1da177e4
LT		 4243 goto err_no_verf;
4244 }
561f0ed4 4245 maxcount = min_t(int, maxcount-16, bytes_left);
1da177e4 4246
aee37764
BF		 4247 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
4248 if (!readdir->rd_dircount)
9c2ece6e 4249 readdir->rd_dircount = svc_max_payload(resp->rqstp);
aee37764 4250
561f0ed4
BF		 4251 readdir->xdr = xdr;
4252 readdir->rd_maxcount = maxcount;
1da177e4 4253 readdir->common.err = 0;
561f0ed4 4254 readdir->cookie_offset = 0;
1da177e4
LT		 4255
4256 offset = readdir->rd_cookie;
4257 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
4258 &offset,
4259 &readdir->common, nfsd4_encode_dirent);
4260 if (nfserr == nfs_ok &&
4261 readdir->common.err == nfserr_toosmall &&
561f0ed4
BF		 4262 xdr->buf->len == starting_len + 8) {
4263 /* nothing encoded; which limit did we hit?: */
4264 if (maxcount - 16 < bytes_left)
4265 /* It was the fault of rd_maxcount: */
4266 nfserr = nfserr_toosmall;
4267 else
4268 /* We ran out of buffer space: */
4269 nfserr = nfserr_resource;
4270 }
1da177e4
LT		 4271 if (nfserr)
4272 goto err_no_verf;
4273
561f0ed4
BF		 4274 if (readdir->cookie_offset) {
4275 wire_offset = cpu_to_be64(offset);
4276 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
4277 &wire_offset, 8);
4278 }
1da177e4 4279
561f0ed4
BF		 4280 p = xdr_reserve_space(xdr, 8);
4281 if (!p) {
4282 WARN_ON_ONCE(1);
4283 goto err_no_verf;
4284 }
1da177e4
LT		 4285 *p++ = 0; /* no more entries */
4286 *p++ = htonl(readdir->common.err == nfserr_eof);
1da177e4
LT		 4287
4288 return 0;
4289err_no_verf:
1fcea5b2 4290 xdr_truncate_encode(xdr, starting_len);
1da177e4
LT		 4291 return nfserr;
4292}
4293
695e12f8 4294static __be32
e78e274e
KC		 4295nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr,
4296 union nfsd4_op_u *u)
1da177e4 4297{
e78e274e 4298 struct nfsd4_remove *remove = &u->remove;
bddfdbcd 4299 struct xdr_stream *xdr = resp->xdr;
bc749ca4 4300 __be32 *p;
1da177e4 4301
bac966d6
BF		 4302 p = xdr_reserve_space(xdr, 20);
4303 if (!p)
4304 return nfserr_resource;
4305 p = encode_cinfo(p, &remove->rm_cinfo);
4306 return 0;
1da177e4
LT		 4307}
4308
695e12f8 4309static __be32
e78e274e
KC		 4310nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr,
4311 union nfsd4_op_u *u)
1da177e4 4312{
e78e274e 4313 struct nfsd4_rename *rename = &u->rename;
bddfdbcd 4314 struct xdr_stream *xdr = resp->xdr;
bc749ca4 4315 __be32 *p;
1da177e4 4316
bac966d6
BF		 4317 p = xdr_reserve_space(xdr, 40);
4318 if (!p)
4319 return nfserr_resource;
4320 p = encode_cinfo(p, &rename->rn_sinfo);
4321 p = encode_cinfo(p, &rename->rn_tinfo);
4322 return 0;
1da177e4
LT		 4323}
4324
695e12f8 4325static __be32
bac966d6 4326nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
dcb488a3 4327{
676e4ebd 4328 u32 i, nflavs, supported;
4796f457
BF		 4329 struct exp_flavor_info *flavs;
4330 struct exp_flavor_info def_flavs[2];
676e4ebd
CL		 4331 __be32 *p, *flavorsp;
4332 static bool report = true;
dcb488a3 4333
4796f457
BF		 4334 if (exp->ex_nflavors) {
4335 flavs = exp->ex_flavors;
4336 nflavs = exp->ex_nflavors;
4337 } else { /* Handling of some defaults in absence of real secinfo: */
4338 flavs = def_flavs;
4339 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
4340 nflavs = 2;
4341 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
4342 flavs[1].pseudoflavor = RPC_AUTH_NULL;
4343 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
4344 nflavs = 1;
4345 flavs[0].pseudoflavor
4346 = svcauth_gss_flavor(exp->ex_client);
4347 } else {
4348 nflavs = 1;
4349 flavs[0].pseudoflavor
4350 = exp->ex_client->flavour->flavour;
4351 }
4352 }
4353
676e4ebd 4354 supported = 0;
d0a381dd
BF		 4355 p = xdr_reserve_space(xdr, 4);
4356 if (!p)
bac966d6 4357 return nfserr_resource;
676e4ebd 4358 flavorsp = p++; /* to be backfilled later */
676e4ebd 4359
4796f457 4360 for (i = 0; i < nflavs; i++) {
676e4ebd 4361 rpc_authflavor_t pf = flavs[i].pseudoflavor;
a77c806f 4362 struct rpcsec_gss_info info;
dcb488a3 4363
676e4ebd
CL		 4364 if (rpcauth_get_gssinfo(pf, &info) == 0) {
4365 supported++;
d0a381dd
BF		 4366 p = xdr_reserve_space(xdr, 4 + 4 +
4367 XDR_LEN(info.oid.len) + 4 + 4);
4368 if (!p)
bac966d6 4369 return nfserr_resource;
c373b0a4 4370 *p++ = cpu_to_be32(RPC_AUTH_GSS);
0c0c267b 4371 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
c373b0a4
BF		 4372 *p++ = cpu_to_be32(info.qop);
4373 *p++ = cpu_to_be32(info.service);
676e4ebd
CL		 4374 } else if (pf < RPC_AUTH_MAXFLAVOR) {
4375 supported++;
d0a381dd
BF		 4376 p = xdr_reserve_space(xdr, 4);
4377 if (!p)
bac966d6 4378 return nfserr_resource;
c373b0a4 4379 *p++ = cpu_to_be32(pf);
676e4ebd
CL		 4380 } else {
4381 if (report)
4382 pr_warn("NFS: SECINFO: security flavor %u "
4383 "is not supported\n", pf);
dcb488a3
AA		 4384 }
4385 }
a77c806f 4386
676e4ebd
CL		 4387 if (nflavs != supported)
4388 report = false;
4389 *flavorsp = htonl(supported);
bac966d6 4390 return 0;
dcb488a3
AA		 4391}
4392
22b6dee8
MJ		 4393static __be32
4394nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 4395 union nfsd4_op_u *u)
22b6dee8 4396{
e78e274e 4397 struct nfsd4_secinfo *secinfo = &u->secinfo;
bddfdbcd 4398 struct xdr_stream *xdr = resp->xdr;
d0a381dd 4399
bac966d6 4400 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
22b6dee8
MJ		 4401}
4402
4403static __be32
4404nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 4405 union nfsd4_op_u *u)
22b6dee8 4406{
e78e274e 4407 struct nfsd4_secinfo_no_name *secinfo = &u->secinfo_no_name;
bddfdbcd 4408 struct xdr_stream *xdr = resp->xdr;
d0a381dd 4409
bac966d6 4410 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
22b6dee8
MJ		 4411}
4412
1da177e4
LT		 4413/*
4414 * The SETATTR encode routine is special -- it always encodes a bitmap,
4415 * regardless of the error status.
4416 */
695e12f8 4417static __be32
e78e274e
KC		 4418nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4419 union nfsd4_op_u *u)
1da177e4 4420{
e78e274e 4421 struct nfsd4_setattr *setattr = &u->setattr;
bddfdbcd 4422 struct xdr_stream *xdr = resp->xdr;
bc749ca4 4423 __be32 *p;
1da177e4 4424
d0a381dd
BF		 4425 p = xdr_reserve_space(xdr, 16);
4426 if (!p)
4427 return nfserr_resource;
1da177e4 4428 if (nfserr) {
c373b0a4
BF		 4429 *p++ = cpu_to_be32(3);
4430 *p++ = cpu_to_be32(0);
4431 *p++ = cpu_to_be32(0);
4432 *p++ = cpu_to_be32(0);
1da177e4
LT		 4433 }
4434 else {
c373b0a4
BF		 4435 *p++ = cpu_to_be32(3);
4436 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
4437 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
4438 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
1da177e4 4439 }
695e12f8 4440 return nfserr;
1da177e4
LT		 4441}
4442
695e12f8 4443static __be32
e78e274e
KC		 4444nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr,
4445 union nfsd4_op_u *u)
1da177e4 4446{
e78e274e 4447 struct nfsd4_setclientid *scd = &u->setclientid;
bddfdbcd 4448 struct xdr_stream *xdr = resp->xdr;
bc749ca4 4449 __be32 *p;
1da177e4
LT		 4450
4451 if (!nfserr) {
d0a381dd
BF		 4452 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
4453 if (!p)
4454 return nfserr_resource;
0c0c267b
BF		 4455 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
4456 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
4457 NFS4_VERIFIER_SIZE);
1da177e4
LT		 4458 }
4459 else if (nfserr == nfserr_clid_inuse) {
d0a381dd
BF		 4460 p = xdr_reserve_space(xdr, 8);
4461 if (!p)
4462 return nfserr_resource;
c373b0a4
BF		 4463 *p++ = cpu_to_be32(0);
4464 *p++ = cpu_to_be32(0);
1da177e4 4465 }
695e12f8 4466 return nfserr;
1da177e4
LT		 4467}
4468
695e12f8 4469static __be32
e78e274e
KC		 4470nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr,
4471 union nfsd4_op_u *u)
1da177e4 4472{
e78e274e 4473 struct nfsd4_write *write = &u->write;
bddfdbcd 4474 struct xdr_stream *xdr = resp->xdr;
bc749ca4 4475 __be32 *p;
1da177e4 4476
bac966d6
BF		 4477 p = xdr_reserve_space(xdr, 16);
4478 if (!p)
4479 return nfserr_resource;
4480 *p++ = cpu_to_be32(write->wr_bytes_written);
4481 *p++ = cpu_to_be32(write->wr_how_written);
4482 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4483 NFS4_VERIFIER_SIZE);
4484 return 0;
1da177e4
LT		 4485}
4486
2db134eb 4487static __be32
57b7b43b 4488nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 4489 union nfsd4_op_u *u)
2db134eb 4490{
e78e274e 4491 struct nfsd4_exchange_id *exid = &u->exchange_id;
bddfdbcd 4492 struct xdr_stream *xdr = resp->xdr;
bc749ca4 4493 __be32 *p;
0733d213
AA		 4494 char *major_id;
4495 char *server_scope;
4496 int major_id_sz;
4497 int server_scope_sz;
4498 uint64_t minor_id = 0;
7627d7dc 4499 struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
0733d213 4500
7627d7dc
SM		 4501 major_id = nn->nfsd_name;
4502 major_id_sz = strlen(nn->nfsd_name);
4503 server_scope = nn->nfsd_name;
4504 server_scope_sz = strlen(nn->nfsd_name);
0733d213 4505
d0a381dd 4506 p = xdr_reserve_space(xdr,
0733d213
AA		 4507 8 /* eir_clientid */ +
4508 4 /* eir_sequenceid */ +
4509 4 /* eir_flags */ +
a8bb84bc 4510 4 /* spr_how */);
d0a381dd
BF		 4511 if (!p)
4512 return nfserr_resource;
0733d213 4513
0c0c267b 4514 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
c373b0a4
BF		 4515 *p++ = cpu_to_be32(exid->seqid);
4516 *p++ = cpu_to_be32(exid->flags);
0733d213 4517
c373b0a4 4518 *p++ = cpu_to_be32(exid->spa_how);
a8bb84bc 4519
57266a6e
BF		 4520 switch (exid->spa_how) {
4521 case SP4_NONE:
4522 break;
4523 case SP4_MACH_CRED:
4524 /* spo_must_enforce bitmap: */
bac966d6 4525 nfserr = nfsd4_encode_bitmap(xdr,
ed941643
AE		 4526 exid->spo_must_enforce[0],
4527 exid->spo_must_enforce[1],
4528 exid->spo_must_enforce[2]);
bac966d6
BF		 4529 if (nfserr)
4530 return nfserr;
ed941643 4531 /* spo_must_allow bitmap: */
bac966d6 4532 nfserr = nfsd4_encode_bitmap(xdr,
ed941643
AE		 4533 exid->spo_must_allow[0],
4534 exid->spo_must_allow[1],
4535 exid->spo_must_allow[2]);
bac966d6
BF		 4536 if (nfserr)
4537 return nfserr;
57266a6e
BF		 4538 break;
4539 default:
4540 WARN_ON_ONCE(1);
4541 }
0733d213 4542
d0a381dd 4543 p = xdr_reserve_space(xdr,
a8bb84bc
KM		 4544 8 /* so_minor_id */ +
4545 4 /* so_major_id.len */ +
4546 (XDR_QUADLEN(major_id_sz) * 4) +
4547 4 /* eir_server_scope.len */ +
4548 (XDR_QUADLEN(server_scope_sz) * 4) +
4549 4 /* eir_server_impl_id.count (0) */);
d0a381dd
BF		 4550 if (!p)
4551 return nfserr_resource;
a8bb84bc 4552
0733d213 4553 /* The server_owner struct */
b64c7f3b 4554 p = xdr_encode_hyper(p, minor_id); /* Minor id */
0733d213 4555 /* major id */
0c0c267b 4556 p = xdr_encode_opaque(p, major_id, major_id_sz);
0733d213
AA		 4557
4558 /* Server scope */
0c0c267b 4559 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
0733d213
AA		 4560
4561 /* Implementation id */
c373b0a4 4562 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
0733d213 4563 return 0;
2db134eb
AA		 4564}
4565
4566static __be32
57b7b43b 4567nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 4568 union nfsd4_op_u *u)
2db134eb 4569{
e78e274e 4570 struct nfsd4_create_session *sess = &u->create_session;
bddfdbcd 4571 struct xdr_stream *xdr = resp->xdr;
bc749ca4 4572 __be32 *p;
ec6b5d7b 4573
d0a381dd
BF		 4574 p = xdr_reserve_space(xdr, 24);
4575 if (!p)
4576 return nfserr_resource;
0c0c267b
BF		 4577 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4578 NFS4_MAX_SESSIONID_LEN);
c373b0a4
BF		 4579 *p++ = cpu_to_be32(sess->seqid);
4580 *p++ = cpu_to_be32(sess->flags);
ec6b5d7b 4581
d0a381dd
BF		 4582 p = xdr_reserve_space(xdr, 28);
4583 if (!p)
4584 return nfserr_resource;
c373b0a4
BF		 4585 *p++ = cpu_to_be32(0); /* headerpadsz */
4586 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4587 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4588 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4589 *p++ = cpu_to_be32(sess->fore_channel.maxops);
4590 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4591 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
ec6b5d7b
AA		 4592
4593 if (sess->fore_channel.nr_rdma_attrs) {
d0a381dd
BF		 4594 p = xdr_reserve_space(xdr, 4);
4595 if (!p)
4596 return nfserr_resource;
c373b0a4 4597 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
ec6b5d7b
AA		 4598 }
4599
d0a381dd
BF		 4600 p = xdr_reserve_space(xdr, 28);
4601 if (!p)
4602 return nfserr_resource;
c373b0a4
BF		 4603 *p++ = cpu_to_be32(0); /* headerpadsz */
4604 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4605 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4606 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4607 *p++ = cpu_to_be32(sess->back_channel.maxops);
4608 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4609 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
ec6b5d7b
AA		 4610
4611 if (sess->back_channel.nr_rdma_attrs) {
d0a381dd
BF		 4612 p = xdr_reserve_space(xdr, 4);
4613 if (!p)
4614 return nfserr_resource;
c373b0a4 4615 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
ec6b5d7b
AA		 4616 }
4617 return 0;
2db134eb
AA		 4618}
4619
c47d832b 4620static __be32
57b7b43b 4621nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 4622 union nfsd4_op_u *u)
2db134eb 4623{
e78e274e 4624 struct nfsd4_sequence *seq = &u->sequence;
bddfdbcd 4625 struct xdr_stream *xdr = resp->xdr;
bc749ca4 4626 __be32 *p;
b85d4c01 4627
d0a381dd
BF		 4628 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4629 if (!p)
4630 return nfserr_resource;
0c0c267b
BF		 4631 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4632 NFS4_MAX_SESSIONID_LEN);
c373b0a4
BF		 4633 *p++ = cpu_to_be32(seq->seqid);
4634 *p++ = cpu_to_be32(seq->slotid);
b7d7ca35 4635 /* Note slotid's are numbered from zero: */
c373b0a4
BF		 4636 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4637 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4638 *p++ = cpu_to_be32(seq->status_flags);
b85d4c01 4639
f5236013 4640 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
b85d4c01 4641 return 0;
2db134eb
AA		 4642}
4643
2355c596 4644static __be32
57b7b43b 4645nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 4646 union nfsd4_op_u *u)
17456804 4647{
e78e274e 4648 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
bddfdbcd 4649 struct xdr_stream *xdr = resp->xdr;
03cfb420 4650 struct nfsd4_test_stateid_id *stateid, *next;
17456804 4651 __be32 *p;
17456804 4652
d0a381dd
BF		 4653 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4654 if (!p)
4655 return nfserr_resource;
17456804 4656 *p++ = htonl(test_stateid->ts_num_ids);
17456804 4657
03cfb420 4658 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
02f5fde5 4659 *p++ = stateid->ts_id_status;
17456804 4660 }
17456804 4661
bac966d6 4662 return 0;
17456804
BS		 4663}
4664
9cf514cc
CH		 4665#ifdef CONFIG_NFSD_PNFS
4666static __be32
4667nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 4668 union nfsd4_op_u *u)
9cf514cc 4669{
e78e274e 4670 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
bddfdbcd 4671 struct xdr_stream *xdr = resp->xdr;
f961e3f2 4672 const struct nfsd4_layout_ops *ops;
9cf514cc
CH		 4673 u32 starting_len = xdr->buf->len, needed_len;
4674 __be32 *p;
4675
9cf514cc
CH		 4676 p = xdr_reserve_space(xdr, 4);
4677 if (!p)
bac966d6 4678 return nfserr_resource;
9cf514cc
CH		 4679
4680 *p++ = cpu_to_be32(gdev->gd_layout_type);
4681
4682 /* If maxcount is 0 then just update notifications */
4683 if (gdev->gd_maxcount != 0) {
f961e3f2 4684 ops = nfsd4_layout_ops[gdev->gd_layout_type];
9cf514cc
CH		 4685 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4686 if (nfserr) {
4687 /*
4688 * We don't bother to burden the layout drivers with
4689 * enforcing gd_maxcount, just tell the client to
4690 * come back with a bigger buffer if it's not enough.
4691 */
4692 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4693 goto toosmall;
bac966d6 4694 return nfserr;
9cf514cc
CH		 4695 }
4696 }
4697
9cf514cc
CH		 4698 if (gdev->gd_notify_types) {
4699 p = xdr_reserve_space(xdr, 4 + 4);
4700 if (!p)
bac966d6 4701 return nfserr_resource;
9cf514cc
CH		 4702 *p++ = cpu_to_be32(1); /* bitmap length */
4703 *p++ = cpu_to_be32(gdev->gd_notify_types);
4704 } else {
4705 p = xdr_reserve_space(xdr, 4);
4706 if (!p)
bac966d6 4707 return nfserr_resource;
9cf514cc
CH		 4708 *p++ = 0;
4709 }
4710
bac966d6 4711 return 0;
9cf514cc
CH		 4712toosmall:
4713 dprintk("%s: maxcount too small\n", __func__);
4714 needed_len = xdr->buf->len + 4 /* notifications */;
4715 xdr_truncate_encode(xdr, starting_len);
4716 p = xdr_reserve_space(xdr, 4);
bac966d6
BF		 4717 if (!p)
4718 return nfserr_resource;
4719 *p++ = cpu_to_be32(needed_len);
4720 return nfserr_toosmall;
9cf514cc
CH		 4721}
4722
4723static __be32
4724nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 4725 union nfsd4_op_u *u)
9cf514cc 4726{
e78e274e 4727 struct nfsd4_layoutget *lgp = &u->layoutget;
bddfdbcd 4728 struct xdr_stream *xdr = resp->xdr;
f961e3f2 4729 const struct nfsd4_layout_ops *ops;
9cf514cc
CH		 4730 __be32 *p;
4731
9cf514cc
CH		 4732 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4733 if (!p)
bac966d6 4734 return nfserr_resource;
9cf514cc
CH		 4735
4736 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4737 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4738 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4739 sizeof(stateid_opaque_t));
4740
4741 *p++ = cpu_to_be32(1); /* we always return a single layout */
4742 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4743 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4744 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4745 *p++ = cpu_to_be32(lgp->lg_layout_type);
4746
f961e3f2 4747 ops = nfsd4_layout_ops[lgp->lg_layout_type];
bac966d6 4748 return ops->encode_layoutget(xdr, lgp);
9cf514cc
CH		 4749}
4750
4751static __be32
4752nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 4753 union nfsd4_op_u *u)
9cf514cc 4754{
e78e274e 4755 struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
bddfdbcd 4756 struct xdr_stream *xdr = resp->xdr;
9cf514cc
CH		 4757 __be32 *p;
4758
9cf514cc
CH		 4759 p = xdr_reserve_space(xdr, 4);
4760 if (!p)
4761 return nfserr_resource;
4762 *p++ = cpu_to_be32(lcp->lc_size_chg);
4763 if (lcp->lc_size_chg) {
4764 p = xdr_reserve_space(xdr, 8);
4765 if (!p)
4766 return nfserr_resource;
4767 p = xdr_encode_hyper(p, lcp->lc_newsize);
4768 }
4769
bac966d6 4770 return 0;
9cf514cc
CH		 4771}
4772
4773static __be32
4774nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 4775 union nfsd4_op_u *u)
9cf514cc 4776{
e78e274e 4777 struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
bddfdbcd 4778 struct xdr_stream *xdr = resp->xdr;
9cf514cc
CH		 4779 __be32 *p;
4780
9cf514cc
CH		 4781 p = xdr_reserve_space(xdr, 4);
4782 if (!p)
4783 return nfserr_resource;
4784 *p++ = cpu_to_be32(lrp->lrs_present);
4785 if (lrp->lrs_present)
376675da 4786 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
bac966d6 4787 return 0;
9cf514cc
CH		 4788}
4789#endif /* CONFIG_NFSD_PNFS */
4790
29ae7f9d 4791static __be32
e0639dc5
OK		 4792nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
4793 struct nfsd42_write_res *write, bool sync)
29ae7f9d
AS		 4794{
4795 __be32 *p;
bddfdbcd 4796 p = xdr_reserve_space(resp->xdr, 4);
e0639dc5
OK		 4797 if (!p)
4798 return nfserr_resource;
29ae7f9d 4799
e0639dc5
OK		 4800 if (sync)
4801 *p++ = cpu_to_be32(0);
4802 else {
4803 __be32 nfserr;
4804 *p++ = cpu_to_be32(1);
bddfdbcd 4805 nfserr = nfsd4_encode_stateid(resp->xdr, &write->cb_stateid);
e0639dc5
OK		 4806 if (nfserr)
4807 return nfserr;
4808 }
bddfdbcd 4809 p = xdr_reserve_space(resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
29ae7f9d
AS		 4810 if (!p)
4811 return nfserr_resource;
4812
29ae7f9d
AS		 4813 p = xdr_encode_hyper(p, write->wr_bytes_written);
4814 *p++ = cpu_to_be32(write->wr_stable_how);
4815 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4816 NFS4_VERIFIER_SIZE);
4817 return nfs_ok;
4818}
4819
51911868
OK		 4820static __be32
4821nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns)
4822{
bddfdbcd 4823 struct xdr_stream *xdr = resp->xdr;
51911868
OK		 4824 struct nfs42_netaddr *addr;
4825 __be32 *p;
4826
4827 p = xdr_reserve_space(xdr, 4);
4828 *p++ = cpu_to_be32(ns->nl4_type);
4829
4830 switch (ns->nl4_type) {
4831 case NL4_NETADDR:
4832 addr = &ns->u.nl4_addr;
4833
4834 /* netid_len, netid, uaddr_len, uaddr (port included
4835 * in RPCBIND_MAXUADDRLEN)
4836 */
4837 p = xdr_reserve_space(xdr,
4838 4 /* netid len */ +
4839 (XDR_QUADLEN(addr->netid_len) * 4) +
4840 4 /* uaddr len */ +
4841 (XDR_QUADLEN(addr->addr_len) * 4));
4842 if (!p)
4843 return nfserr_resource;
4844
4845 *p++ = cpu_to_be32(addr->netid_len);
4846 p = xdr_encode_opaque_fixed(p, addr->netid,
4847 addr->netid_len);
4848 *p++ = cpu_to_be32(addr->addr_len);
4849 p = xdr_encode_opaque_fixed(p, addr->addr,
4850 addr->addr_len);
4851 break;
4852 default:
4853 WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR);
4854 return nfserr_inval;
4855 }
4856
4857 return 0;
4858}
4859
29ae7f9d
AS		 4860static __be32
4861nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 4862 union nfsd4_op_u *u)
29ae7f9d 4863{
e78e274e 4864 struct nfsd4_copy *copy = &u->copy;
29ae7f9d
AS		 4865 __be32 *p;
4866
e0639dc5 4867 nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
1913cdf5 4868 nfsd4_copy_is_sync(copy));
bac966d6
BF		 4869 if (nfserr)
4870 return nfserr;
29ae7f9d 4871
bddfdbcd 4872 p = xdr_reserve_space(resp->xdr, 4 + 4);
edcc8452 4873 *p++ = xdr_one; /* cr_consecutive */
1913cdf5 4874 *p = nfsd4_copy_is_sync(copy) ? xdr_one : xdr_zero;
bac966d6 4875 return 0;
29ae7f9d
AS		 4876}
4877
6308bc98
OK		 4878static __be32
4879nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 4880 union nfsd4_op_u *u)
6308bc98 4881{
e78e274e 4882 struct nfsd4_offload_status *os = &u->offload_status;
bddfdbcd 4883 struct xdr_stream *xdr = resp->xdr;
6308bc98
OK		 4884 __be32 *p;
4885
4886 p = xdr_reserve_space(xdr, 8 + 4);
4887 if (!p)
4888 return nfserr_resource;
4889 p = xdr_encode_hyper(p, os->count);
4890 *p++ = cpu_to_be32(0);
528b8493
AS		 4891 return nfserr;
4892}
4893
4894static __be32
4895nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
eeadcb75 4896 struct nfsd4_read *read)
528b8493 4897{
eeadcb75 4898 bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags);
528b8493 4899 struct file *file = read->rd_nf->nf_file;
eeadcb75
AS		 4900 struct xdr_stream *xdr = resp->xdr;
4901 unsigned long maxcount;
4902 __be32 nfserr, *p;
528b8493
AS		 4903
4904 /* Content type, offset, byte count */
4905 p = xdr_reserve_space(xdr, 4 + 8 + 4);
4906 if (!p)
eeadcb75
AS		 4907 return nfserr_io;
4908 if (resp->xdr->buf->page_len && splice_ok) {
4909 WARN_ON_ONCE(splice_ok);
4910 return nfserr_serverfault;
4911 }
528b8493 4912
eeadcb75
AS		 4913 maxcount = min_t(unsigned long, read->rd_length,
4914 (xdr->buf->buflen - xdr->buf->len));
528b8493 4915
eeadcb75
AS		 4916 if (file->f_op->splice_read && splice_ok)
4917 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4918 else
4919 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
528b8493
AS		 4920 if (nfserr)
4921 return nfserr;
278765ea 4922
eeadcb75 4923 *p++ = cpu_to_be32(NFS4_CONTENT_DATA);
1e37d0e5 4924 p = xdr_encode_hyper(p, read->rd_offset);
eeadcb75 4925 *p = cpu_to_be32(read->rd_length);
2db27992 4926
2db27992
AS		 4927 return nfs_ok;
4928}
4929
528b8493
AS		 4930static __be32
4931nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 4932 union nfsd4_op_u *u)
528b8493 4933{
e78e274e 4934 struct nfsd4_read *read = &u->read;
eeadcb75 4935 struct file *file = read->rd_nf->nf_file;
bddfdbcd 4936 struct xdr_stream *xdr = resp->xdr;
528b8493 4937 int starting_len = xdr->buf->len;
eeadcb75
AS		 4938 u32 segments = 0;
4939 __be32 *p;
528b8493
AS		 4940
4941 if (nfserr)
4942 return nfserr;
528b8493
AS		 4943
4944 /* eof flag, segment count */
4945 p = xdr_reserve_space(xdr, 4 + 4);
4946 if (!p)
eeadcb75 4947 return nfserr_io;
528b8493
AS		 4948 xdr_commit_encode(xdr);
4949
eeadcb75
AS		 4950 read->rd_eof = read->rd_offset >= i_size_read(file_inode(file));
4951 if (read->rd_eof)
2db27992
AS		 4952 goto out;
4953
eeadcb75
AS		 4954 nfserr = nfsd4_encode_read_plus_data(resp, read);
4955 if (nfserr) {
528b8493 4956 xdr_truncate_encode(xdr, starting_len);
eeadcb75 4957 return nfserr;
528b8493 4958 }
6308bc98 4959
eeadcb75
AS		 4960 segments++;
4961
4962out:
4963 p = xdr_encode_bool(p, read->rd_eof);
4964 *p = cpu_to_be32(segments);
6308bc98
OK		 4965 return nfserr;
4966}
4967
51911868
OK		 4968static __be32
4969nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 4970 union nfsd4_op_u *u)
51911868 4971{
e78e274e 4972 struct nfsd4_copy_notify *cn = &u->copy_notify;
bddfdbcd 4973 struct xdr_stream *xdr = resp->xdr;
51911868
OK		 4974 __be32 *p;
4975
4976 if (nfserr)
4977 return nfserr;
4978
4979 /* 8 sec, 4 nsec */
4980 p = xdr_reserve_space(xdr, 12);
4981 if (!p)
4982 return nfserr_resource;
4983
4984 /* cnr_lease_time */
4985 p = xdr_encode_hyper(p, cn->cpn_sec);
4986 *p++ = cpu_to_be32(cn->cpn_nsec);
4987
4988 /* cnr_stateid */
4989 nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid);
4990 if (nfserr)
4991 return nfserr;
4992
4993 /* cnr_src.nl_nsvr */
4994 p = xdr_reserve_space(xdr, 4);
4995 if (!p)
4996 return nfserr_resource;
4997
4998 *p++ = cpu_to_be32(1);
4999
09426ef2
CL		 5000 nfserr = nfsd42_encode_nl4_server(resp, cn->cpn_src);
5001 return nfserr;
51911868
OK		 5002}
5003
24bab491
AS		 5004static __be32
5005nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 5006 union nfsd4_op_u *u)
24bab491 5007{
e78e274e 5008 struct nfsd4_seek *seek = &u->seek;
24bab491
AS		 5009 __be32 *p;
5010
bddfdbcd 5011 p = xdr_reserve_space(resp->xdr, 4 + 8);
24bab491
AS		 5012 *p++ = cpu_to_be32(seek->seek_eof);
5013 p = xdr_encode_hyper(p, seek->seek_pos);
5014
bac966d6 5015 return 0;
24bab491
AS		 5016}
5017
695e12f8 5018static __be32
e78e274e
KC		 5019nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr,
5020 union nfsd4_op_u *p)
695e12f8
BH		 5021{
5022 return nfserr;
5023}
5024
23e50fe3
FL		 5025/*
5026 * Encode kmalloc-ed buffer in to XDR stream.
5027 */
b9a49237 5028static __be32
23e50fe3
FL		 5029nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
5030{
5031 u32 cplen;
5032 __be32 *p;
5033
5034 cplen = min_t(unsigned long, buflen,
5035 ((void *)xdr->end - (void *)xdr->p));
5036 p = xdr_reserve_space(xdr, cplen);
5037 if (!p)
5038 return nfserr_resource;
5039
5040 memcpy(p, buf, cplen);
5041 buf += cplen;
5042 buflen -= cplen;
5043
5044 while (buflen) {
5045 cplen = min_t(u32, buflen, PAGE_SIZE);
5046 p = xdr_reserve_space(xdr, cplen);
5047 if (!p)
5048 return nfserr_resource;
5049
5050 memcpy(p, buf, cplen);
5051
5052 if (cplen < PAGE_SIZE) {
5053 /*
5054 * We're done, with a length that wasn't page
5055 * aligned, so possibly not word aligned. Pad
5056 * any trailing bytes with 0.
5057 */
5058 xdr_encode_opaque_fixed(p, NULL, cplen);
5059 break;
5060 }
5061
5062 buflen -= PAGE_SIZE;
5063 buf += PAGE_SIZE;
5064 }
5065
5066 return 0;
5067}
5068
5069static __be32
5070nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 5071 union nfsd4_op_u *u)
23e50fe3 5072{
e78e274e 5073 struct nfsd4_getxattr *getxattr = &u->getxattr;
bddfdbcd 5074 struct xdr_stream *xdr = resp->xdr;
23e50fe3
FL		 5075 __be32 *p, err;
5076
5077 p = xdr_reserve_space(xdr, 4);
5078 if (!p)
5079 return nfserr_resource;
5080
5081 *p = cpu_to_be32(getxattr->getxa_len);
5082
5083 if (getxattr->getxa_len == 0)
5084 return 0;
5085
5086 err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf,
5087 getxattr->getxa_len);
5088
5089 kvfree(getxattr->getxa_buf);
5090
5091 return err;
5092}
5093
5094static __be32
5095nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 5096 union nfsd4_op_u *u)
23e50fe3 5097{
e78e274e 5098 struct nfsd4_setxattr *setxattr = &u->setxattr;
bddfdbcd 5099 struct xdr_stream *xdr = resp->xdr;
23e50fe3
FL		 5100 __be32 *p;
5101
5102 p = xdr_reserve_space(xdr, 20);
5103 if (!p)
5104 return nfserr_resource;
5105
5106 encode_cinfo(p, &setxattr->setxa_cinfo);
5107
5108 return 0;
5109}
5110
5111/*
5112 * See if there are cookie values that can be rejected outright.
5113 */
5114static __be32
5115nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
5116 u32 *offsetp)
5117{
5118 u64 cookie = listxattrs->lsxa_cookie;
5119
5120 /*
5121 * If the cookie is larger than the maximum number we can fit
5122 * in either the buffer we just got back from vfs_listxattr, or,
5123 * XDR-encoded, in the return buffer, it's invalid.
5124 */
5125 if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
5126 return nfserr_badcookie;
5127
5128 if (cookie > (listxattrs->lsxa_maxcount /
5129 (XDR_QUADLEN(XATTR_USER_PREFIX_LEN + 2) + 4)))
5130 return nfserr_badcookie;
5131
5132 *offsetp = (u32)cookie;
5133 return 0;
5134}
5135
5136static __be32
5137nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 5138 union nfsd4_op_u *u)
23e50fe3 5139{
e78e274e 5140 struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
bddfdbcd 5141 struct xdr_stream *xdr = resp->xdr;
23e50fe3
FL		 5142 u32 cookie_offset, count_offset, eof;
5143 u32 left, xdrleft, slen, count;
5144 u32 xdrlen, offset;
5145 u64 cookie;
5146 char *sp;
b9a49237 5147 __be32 status, tmp;
23e50fe3
FL		 5148 __be32 *p;
5149 u32 nuser;
5150
5151 eof = 1;
5152
5153 status = nfsd4_listxattr_validate_cookie(listxattrs, &offset);
5154 if (status)
5155 goto out;
5156
5157 /*
5158 * Reserve space for the cookie and the name array count. Record
5159 * the offsets to save them later.
5160 */
5161 cookie_offset = xdr->buf->len;
5162 count_offset = cookie_offset + 8;
5163 p = xdr_reserve_space(xdr, 12);
5164 if (!p) {
5165 status = nfserr_resource;
5166 goto out;
5167 }
5168
5169 count = 0;
5170 left = listxattrs->lsxa_len;
5171 sp = listxattrs->lsxa_buf;
5172 nuser = 0;
5173
5174 xdrleft = listxattrs->lsxa_maxcount;
5175
5176 while (left > 0 && xdrleft > 0) {
5177 slen = strlen(sp);
5178
5179 /*
4cce11fa 5180 * Check if this is a "user." attribute, skip it if not.
23e50fe3
FL		 5181 */
5182 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
5183 goto contloop;
5184
5185 slen -= XATTR_USER_PREFIX_LEN;
5186 xdrlen = 4 + ((slen + 3) & ~3);
5187 if (xdrlen > xdrleft) {
5188 if (count == 0) {
5189 /*
5190 * Can't even fit the first attribute name.
5191 */
5192 status = nfserr_toosmall;
5193 goto out;
5194 }
5195 eof = 0;
5196 goto wreof;
5197 }
5198
5199 left -= XATTR_USER_PREFIX_LEN;
5200 sp += XATTR_USER_PREFIX_LEN;
5201 if (nuser++ < offset)
5202 goto contloop;
5203
5204
5205 p = xdr_reserve_space(xdr, xdrlen);
5206 if (!p) {
5207 status = nfserr_resource;
5208 goto out;
5209 }
5210
e2a1840e 5211 xdr_encode_opaque(p, sp, slen);
23e50fe3
FL		 5212
5213 xdrleft -= xdrlen;
5214 count++;
5215contloop:
5216 sp += slen + 1;
5217 left -= slen + 1;
5218 }
5219
5220 /*
5221 * If there were user attributes to copy, but we didn't copy
5222 * any, the offset was too large (e.g. the cookie was invalid).
5223 */
5224 if (nuser > 0 && count == 0) {
5225 status = nfserr_badcookie;
5226 goto out;
5227 }
5228
5229wreof:
5230 p = xdr_reserve_space(xdr, 4);
5231 if (!p) {
5232 status = nfserr_resource;
5233 goto out;
5234 }
5235 *p = cpu_to_be32(eof);
5236
5237 cookie = offset + count;
5238
5239 write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &cookie, 8);
b9a49237
CL		 5240 tmp = cpu_to_be32(count);
5241 write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4);
23e50fe3
FL		 5242out:
5243 if (listxattrs->lsxa_len)
5244 kvfree(listxattrs->lsxa_buf);
5245 return status;
5246}
5247
5248static __be32
5249nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
e78e274e 5250 union nfsd4_op_u *u)
23e50fe3 5251{
e78e274e 5252 struct nfsd4_removexattr *removexattr = &u->removexattr;
bddfdbcd 5253 struct xdr_stream *xdr = resp->xdr;
23e50fe3
FL		 5254 __be32 *p;
5255
5256 p = xdr_reserve_space(xdr, 20);
5257 if (!p)
5258 return nfserr_resource;
5259
5260 p = encode_cinfo(p, &removexattr->rmxa_cinfo);
5261 return 0;
5262}
5263
e78e274e 5264typedef __be32(*nfsd4_enc)(struct nfsd4_compoundres *, __be32, union nfsd4_op_u *u);
695e12f8 5265
2db134eb
AA		 5266/*
5267 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
5268 * since we don't need to filter out obsolete ops as this is
5269 * done in the decoding phase.
5270 */
c1df609d 5271static const nfsd4_enc nfsd4_enc_ops[] = {
e78e274e
KC		 5272 [OP_ACCESS] = nfsd4_encode_access,
5273 [OP_CLOSE] = nfsd4_encode_close,
5274 [OP_COMMIT] = nfsd4_encode_commit,
5275 [OP_CREATE] = nfsd4_encode_create,
5276 [OP_DELEGPURGE] = nfsd4_encode_noop,
5277 [OP_DELEGRETURN] = nfsd4_encode_noop,
5278 [OP_GETATTR] = nfsd4_encode_getattr,
5279 [OP_GETFH] = nfsd4_encode_getfh,
5280 [OP_LINK] = nfsd4_encode_link,
5281 [OP_LOCK] = nfsd4_encode_lock,
5282 [OP_LOCKT] = nfsd4_encode_lockt,
5283 [OP_LOCKU] = nfsd4_encode_locku,
5284 [OP_LOOKUP] = nfsd4_encode_noop,
5285 [OP_LOOKUPP] = nfsd4_encode_noop,
5286 [OP_NVERIFY] = nfsd4_encode_noop,
5287 [OP_OPEN] = nfsd4_encode_open,
5288 [OP_OPENATTR] = nfsd4_encode_noop,
5289 [OP_OPEN_CONFIRM] = nfsd4_encode_open_confirm,
5290 [OP_OPEN_DOWNGRADE] = nfsd4_encode_open_downgrade,
5291 [OP_PUTFH] = nfsd4_encode_noop,
5292 [OP_PUTPUBFH] = nfsd4_encode_noop,
5293 [OP_PUTROOTFH] = nfsd4_encode_noop,
5294 [OP_READ] = nfsd4_encode_read,
5295 [OP_READDIR] = nfsd4_encode_readdir,
5296 [OP_READLINK] = nfsd4_encode_readlink,
5297 [OP_REMOVE] = nfsd4_encode_remove,
5298 [OP_RENAME] = nfsd4_encode_rename,
5299 [OP_RENEW] = nfsd4_encode_noop,
5300 [OP_RESTOREFH] = nfsd4_encode_noop,
5301 [OP_SAVEFH] = nfsd4_encode_noop,
5302 [OP_SECINFO] = nfsd4_encode_secinfo,
5303 [OP_SETATTR] = nfsd4_encode_setattr,
5304 [OP_SETCLIENTID] = nfsd4_encode_setclientid,
5305 [OP_SETCLIENTID_CONFIRM] = nfsd4_encode_noop,
5306 [OP_VERIFY] = nfsd4_encode_noop,
5307 [OP_WRITE] = nfsd4_encode_write,
5308 [OP_RELEASE_LOCKOWNER] = nfsd4_encode_noop,
2db134eb
AA		 5309
5310 /* NFSv4.1 operations */
e78e274e
KC		 5311 [OP_BACKCHANNEL_CTL] = nfsd4_encode_noop,
5312 [OP_BIND_CONN_TO_SESSION] = nfsd4_encode_bind_conn_to_session,
5313 [OP_EXCHANGE_ID] = nfsd4_encode_exchange_id,
5314 [OP_CREATE_SESSION] = nfsd4_encode_create_session,
5315 [OP_DESTROY_SESSION] = nfsd4_encode_noop,
5316 [OP_FREE_STATEID] = nfsd4_encode_noop,
5317 [OP_GET_DIR_DELEGATION] = nfsd4_encode_noop,
9cf514cc 5318#ifdef CONFIG_NFSD_PNFS
e78e274e
KC		 5319 [OP_GETDEVICEINFO] = nfsd4_encode_getdeviceinfo,
5320 [OP_GETDEVICELIST] = nfsd4_encode_noop,
5321 [OP_LAYOUTCOMMIT] = nfsd4_encode_layoutcommit,
5322 [OP_LAYOUTGET] = nfsd4_encode_layoutget,
5323 [OP_LAYOUTRETURN] = nfsd4_encode_layoutreturn,
9cf514cc 5324#else
e78e274e
KC		 5325 [OP_GETDEVICEINFO] = nfsd4_encode_noop,
5326 [OP_GETDEVICELIST] = nfsd4_encode_noop,
5327 [OP_LAYOUTCOMMIT] = nfsd4_encode_noop,
5328 [OP_LAYOUTGET] = nfsd4_encode_noop,
5329 [OP_LAYOUTRETURN] = nfsd4_encode_noop,
9cf514cc 5330#endif
e78e274e
KC		 5331 [OP_SECINFO_NO_NAME] = nfsd4_encode_secinfo_no_name,
5332 [OP_SEQUENCE] = nfsd4_encode_sequence,
5333 [OP_SET_SSV] = nfsd4_encode_noop,
5334 [OP_TEST_STATEID] = nfsd4_encode_test_stateid,
5335 [OP_WANT_DELEGATION] = nfsd4_encode_noop,
5336 [OP_DESTROY_CLIENTID] = nfsd4_encode_noop,
5337 [OP_RECLAIM_COMPLETE] = nfsd4_encode_noop,
87a15a80
AS		 5338
5339 /* NFSv4.2 operations */
e78e274e
KC		 5340 [OP_ALLOCATE] = nfsd4_encode_noop,
5341 [OP_COPY] = nfsd4_encode_copy,
5342 [OP_COPY_NOTIFY] = nfsd4_encode_copy_notify,
5343 [OP_DEALLOCATE] = nfsd4_encode_noop,
5344 [OP_IO_ADVISE] = nfsd4_encode_noop,
5345 [OP_LAYOUTERROR] = nfsd4_encode_noop,
5346 [OP_LAYOUTSTATS] = nfsd4_encode_noop,
5347 [OP_OFFLOAD_CANCEL] = nfsd4_encode_noop,
5348 [OP_OFFLOAD_STATUS] = nfsd4_encode_offload_status,
5349 [OP_READ_PLUS] = nfsd4_encode_read_plus,
5350 [OP_SEEK] = nfsd4_encode_seek,
5351 [OP_WRITE_SAME] = nfsd4_encode_noop,
5352 [OP_CLONE] = nfsd4_encode_noop,
23e50fe3
FL		 5353
5354 /* RFC 8276 extended atributes operations */
e78e274e
KC		 5355 [OP_GETXATTR] = nfsd4_encode_getxattr,
5356 [OP_SETXATTR] = nfsd4_encode_setxattr,
5357 [OP_LISTXATTRS] = nfsd4_encode_listxattrs,
5358 [OP_REMOVEXATTR] = nfsd4_encode_removexattr,
695e12f8
BH		 5359};
5360
496c262c 5361/*
a8095f7e
BF		 5362 * Calculate whether we still have space to encode repsize bytes.
5363 * There are two considerations:
5364 * - For NFS versions >=4.1, the size of the reply must stay within
5365 * session limits
5366 * - For all NFS versions, we must stay within limited preallocated
5367 * buffer space.
496c262c 5368 *
a8095f7e
BF		 5369 * This is called before the operation is processed, so can only provide
5370 * an upper estimate. For some nonidempotent operations (such as
5371 * getattr), it's not necessarily a problem if that estimate is wrong,
5372 * as we can fail it after processing without significant side effects.
496c262c 5373 */
a8095f7e 5374__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
496c262c 5375{
67492c99 5376 struct xdr_buf *buf = &resp->rqstp->rq_res;
47ee5298 5377 struct nfsd4_slot *slot = resp->cstate.slot;
496c262c 5378
47ee5298
BF		 5379 if (buf->len + respsize <= buf->buflen)
5380 return nfs_ok;
5381 if (!nfsd4_has_session(&resp->cstate))
ea8d7720 5382 return nfserr_resource;
47ee5298
BF		 5383 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
5384 WARN_ON_ONCE(1);
5385 return nfserr_rep_too_big_to_cache;
ea8d7720 5386 }
47ee5298 5387 return nfserr_rep_too_big;
496c262c
AA		 5388}
5389
1da177e4
LT		 5390void
5391nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
5392{
bddfdbcd 5393 struct xdr_stream *xdr = resp->xdr;
9411b1d4 5394 struct nfs4_stateowner *so = resp->cstate.replay_owner;
5f4ab945 5395 struct svc_rqst *rqstp = resp->rqstp;
34b1744c 5396 const struct nfsd4_operation *opdesc = op->opdesc;
082d4bd7 5397 int post_err_offset;
07d1f802 5398 nfsd4_enc encoder;
bc749ca4 5399 __be32 *p;
1da177e4 5400
d0a381dd
BF		 5401 p = xdr_reserve_space(xdr, 8);
5402 if (!p) {
5403 WARN_ON_ONCE(1);
5404 return;
5405 }
c373b0a4 5406 *p++ = cpu_to_be32(op->opnum);
082d4bd7 5407 post_err_offset = xdr->buf->len;
1da177e4 5408
695e12f8
BH		 5409 if (op->opnum == OP_ILLEGAL)
5410 goto status;
b7571e4c
BF		 5411 if (op->status && opdesc &&
5412 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
5413 goto status;
3a237b4a 5414 BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
695e12f8 5415 !nfsd4_enc_ops[op->opnum]);
07d1f802
BF		 5416 encoder = nfsd4_enc_ops[op->opnum];
5417 op->status = encoder(resp, op->status, &op->u);
08281341
CL		 5418 if (op->status)
5419 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status);
34b1744c
BF		 5420 if (opdesc && opdesc->op_release)
5421 opdesc->op_release(&op->u);
2825a7f9
BF		 5422 xdr_commit_encode(xdr);
5423
067e1ace 5424 /* nfsd4_check_resp_size guarantees enough room for error status */
5f4ab945
BF		 5425 if (!op->status) {
5426 int space_needed = 0;
5427 if (!nfsd4_last_compound_op(rqstp))
5428 space_needed = COMPOUND_ERR_SLACK_SPACE;
5429 op->status = nfsd4_check_resp_size(resp, space_needed);
5430 }
c8f13d97
BF		 5431 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
5432 struct nfsd4_slot *slot = resp->cstate.slot;
5433
5434 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
5435 op->status = nfserr_rep_too_big_to_cache;
5436 else
5437 op->status = nfserr_rep_too_big;
5438 }
07d1f802
BF		 5439 if (op->status == nfserr_resource ||
5440 op->status == nfserr_rep_too_big ||
5441 op->status == nfserr_rep_too_big_to_cache) {
5442 /*
5443 * The operation may have already been encoded or
5444 * partially encoded. No op returns anything additional
5445 * in the case of one of these three errors, so we can
5446 * just truncate back to after the status. But it's a
5447 * bug if we had to do this on a non-idempotent op:
5448 */
5449 warn_on_nonidempotent_op(op);
082d4bd7 5450 xdr_truncate_encode(xdr, post_err_offset);
07d1f802 5451 }
9411b1d4 5452 if (so) {
082d4bd7
BF		 5453 int len = xdr->buf->len - post_err_offset;
5454
9411b1d4 5455 so->so_replay.rp_status = op->status;
082d4bd7
BF		 5456 so->so_replay.rp_buflen = len;
5457 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
5458 so->so_replay.rp_buf, len);
9411b1d4 5459 }
695e12f8 5460status:
095a764b 5461 *p = op->status;
1da177e4
LT		 5462}
5463
5464/*
5465 * Encode the reply stored in the stateowner reply cache
5466 *
5467 * XDR note: do not encode rp->rp_buflen: the buffer contains the
5468 * previously sent already encoded operation.
1da177e4
LT		 5469 */
5470void
d0a381dd 5471nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
1da177e4 5472{
bc749ca4 5473 __be32 *p;
1da177e4
LT		 5474 struct nfs4_replay *rp = op->replay;
5475
d0a381dd
BF		 5476 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
5477 if (!p) {
5478 WARN_ON_ONCE(1);
5479 return;
5480 }
c373b0a4 5481 *p++ = cpu_to_be32(op->opnum);
1da177e4 5482 *p++ = rp->rp_status; /* already xdr'ed */
1da177e4 5483
0c0c267b 5484 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
1da177e4
LT		 5485}
5486
8537488b 5487void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
1da177e4 5488{
3e98abff
BF		 5489 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5490
1da177e4 5491 if (args->ops != args->iops) {
80e591ce 5492 vfree(args->ops);
1da177e4
LT		 5493 args->ops = args->iops;
5494 }
1da177e4 5495 while (args->to_free) {
d5e23383 5496 struct svcxdr_tmpbuf *tb = args->to_free;
1da177e4 5497 args->to_free = tb->next;
1da177e4
LT		 5498 kfree(tb);
5499 }
5500}
5501
c44b31c2 5502bool
16c66364 5503nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
1da177e4 5504{
026fec7e
CH		 5505 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5506
c1346a12 5507 /* svcxdr_tmp_alloc */
1da177e4 5508 args->to_free = NULL;
c1346a12 5509
16c66364 5510 args->xdr = xdr;
1da177e4
LT		 5511 args->ops = args->iops;
5512 args->rqstp = rqstp;
5513
d9b74bda 5514 return nfsd4_decode_compound(args);
1da177e4
LT		 5515}
5516
130e2054 5517bool
fda49441 5518nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
1da177e4 5519{
63f8de37 5520 struct nfsd4_compoundres *resp = rqstp->rq_resp;
fda49441 5521 __be32 *p;
6ac90391 5522
3b0ebb25
CL		 5523 /*
5524 * Send buffer space for the following items is reserved
5525 * at the top of nfsd4_proc_compound().
5526 */
5527 p = resp->statusp;
5528
5529 *p++ = resp->cstate.status;
cc028a10 5530
fda49441 5531 rqstp->rq_next_page = xdr->page_ptr + 1;
2825a7f9 5532
1da177e4
LT		 5533 *p++ = htonl(resp->taglen);
5534 memcpy(p, resp->tag, resp->taglen);
5535 p += XDR_QUADLEN(resp->taglen);
5536 *p++ = htonl(resp->opcnt);
5537
b607664e 5538 nfsd4_sequence_done(resp);
130e2054 5539 return true;
1da177e4 5540}
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