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NFSD: Replace READ* macros in nfsd4_decode_offload_status()
[linux-block.git] / fs / nfsd / nfs4xdr.c
CommitLineData
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
FL		 44#include <linux/xattr.h>
45#include <uapi/linux/xattr.h>
9a74af21 46
2ca72e17
BF		 47#include "idmap.h"
48#include "acl.h"
9a74af21 49#include "xdr4.h"
0a3adade 50#include "vfs.h"
17456804 51#include "state.h"
1091006c 52#include "cache.h"
3d733711 53#include "netns.h"
9cf514cc 54#include "pnfs.h"
5c4583b2 55#include "filecache.h"
2ca72e17 56
08281341
CL		 57#include "trace.h"
58
18032ca0
DQ		 59#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
60#include <linux/security.h>
61#endif
62
63
1da177e4
LT		 64#define NFSDDBG_FACILITY NFSDDBG_XDR
65
5cf23dbb 66const u32 nfsd_suppattrs[3][3] = {
916d2d84
BF		 67 {NFSD4_SUPPORTED_ATTRS_WORD0,
68 NFSD4_SUPPORTED_ATTRS_WORD1,
69 NFSD4_SUPPORTED_ATTRS_WORD2},
70
71 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
72 NFSD4_1_SUPPORTED_ATTRS_WORD1,
73 NFSD4_1_SUPPORTED_ATTRS_WORD2},
74
75 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
76 NFSD4_1_SUPPORTED_ATTRS_WORD1,
77 NFSD4_2_SUPPORTED_ATTRS_WORD2},
78};
79
42ca0993
BF		 80/*
81 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
82 * directory in order to indicate to the client that a filesystem boundary is present
83 * We use a fixed fsid for a referral
84 */
85#define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
86#define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
87
b37ad28b 88static __be32
a36b1725 89check_filename(char *str, int len)
1da177e4
LT		 90{
91 int i;
92
93 if (len == 0)
94 return nfserr_inval;
000dfa18
CL		 95 if (len > NFS4_MAXNAMLEN)
96 return nfserr_nametoolong;
1da177e4 97 if (isdotent(str, len))
a36b1725 98 return nfserr_badname;
1da177e4
LT		 99 for (i = 0; i < len; i++)
100 if (str[i] == '/')
a36b1725 101 return nfserr_badname;
1da177e4
LT		 102 return 0;
103}
104
1da177e4 105#define DECODE_HEAD \
2ebbc012 106 __be32 *p; \
b37ad28b 107 __be32 status
1da177e4
LT		 108#define DECODE_TAIL \
109 status = 0; \
110out: \
111 return status; \
112xdr_error: \
817cb9d4
CL		 113 dprintk("NFSD: xdr error (%s:%d)\n", \
114 __FILE__, __LINE__); \
1da177e4
LT		 115 status = nfserr_bad_xdr; \
116 goto out
117
1da177e4
LT		 118#define READMEM(x,nbytes) do { \
119 x = (char *)p; \
120 p += XDR_QUADLEN(nbytes); \
121} while (0)
122#define SAVEMEM(x,nbytes) do { \
123 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
124 savemem(argp, p, nbytes) : \
125 (char *)p)) { \
817cb9d4
CL		 126 dprintk("NFSD: xdr error (%s:%d)\n", \
127 __FILE__, __LINE__); \
1da177e4
LT		 128 goto xdr_error; \
129 } \
130 p += XDR_QUADLEN(nbytes); \
131} while (0)
132#define COPYMEM(x,nbytes) do { \
133 memcpy((x), p, nbytes); \
134 p += XDR_QUADLEN(nbytes); \
135} while (0)
c1346a12
CL		 136#define READ_BUF(nbytes) \
137 do { \
138 p = xdr_inline_decode(argp->xdr,\
139 nbytes); \
140 if (!p) \
141 goto xdr_error; \
142 } while (0)
2b86e3aa 143
60adfc50
AA		 144static int zero_clientid(clientid_t *clid)
145{
146 return (clid->cl_boot == 0) && (clid->cl_id == 0);
147}
148
2d8498db 149/**
d5e23383 150 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
ce043ac8 151 * @argp: NFSv4 compound argument structure
ed992753 152 * @len: length of buffer to allocate
2d8498db 153 *
ed992753
TM		 154 * Allocates a buffer of size @len to be freed when processing the compound
155 * operation described in @argp finishes.
2d8498db 156 */
d5e23383
BF		 157static void *
158svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
1da177e4 159{
d5e23383 160 struct svcxdr_tmpbuf *tb;
1da177e4 161
d5e23383 162 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
1da177e4 163 if (!tb)
d5e23383 164 return NULL;
1da177e4
LT		 165 tb->next = argp->to_free;
166 argp->to_free = tb;
d5e23383 167 return tb->buf;
1da177e4
LT		 168}
169
29c353b3
BF		 170/*
171 * For xdr strings that need to be passed to other kernel api's
172 * as null-terminated strings.
173 *
174 * Note null-terminating in place usually isn't safe since the
175 * buffer might end on a page boundary.
176 */
177static char *
178svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
179{
d5e23383 180 char *p = svcxdr_tmpalloc(argp, len + 1);
29c353b3
BF		 181
182 if (!p)
183 return NULL;
184 memcpy(p, buf, len);
185 p[len] = '\0';
29c353b3 186 return p;
1da177e4
LT		 187}
188
2d8498db
CH		 189/**
190 * savemem - duplicate a chunk of memory for later processing
191 * @argp: NFSv4 compound argument structure to be freed with
192 * @p: pointer to be duplicated
193 * @nbytes: length to be duplicated
194 *
195 * Returns a pointer to a copy of @nbytes bytes of memory at @p
196 * that are preserved until processing of the NFSv4 compound
197 * operation described by @argp finishes.
198 */
2ebbc012 199static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
1da177e4 200{
d5e23383
BF		 201 void *ret;
202
203 ret = svcxdr_tmpalloc(argp, nbytes);
204 if (!ret)
1da177e4 205 return NULL;
d5e23383
BF		 206 memcpy(ret, p, nbytes);
207 return ret;
1da177e4
LT		 208}
209
5dcbfabb
CL		 210
211/*
212 * NFSv4 basic data type decoders
213 */
214
1a994408
CL		 215/*
216 * This helper handles variable-length opaques which belong to protocol
217 * elements that this implementation does not support.
218 */
219static __be32
220nfsd4_decode_ignored_string(struct nfsd4_compoundargs *argp, u32 maxlen)
221{
222 u32 len;
223
224 if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
225 return nfserr_bad_xdr;
226 if (maxlen && len > maxlen)
227 return nfserr_bad_xdr;
228 if (!xdr_inline_decode(argp->xdr, len))
229 return nfserr_bad_xdr;
230
231 return nfs_ok;
232}
233
5dcbfabb
CL		 234static __be32
235nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
236{
237 __be32 *p;
238 u32 len;
239
240 if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
241 return nfserr_bad_xdr;
242 if (len == 0 || len > NFS4_OPAQUE_LIMIT)
243 return nfserr_bad_xdr;
244 p = xdr_inline_decode(argp->xdr, len);
245 if (!p)
246 return nfserr_bad_xdr;
247 o->data = svcxdr_tmpalloc(argp, len);
248 if (!o->data)
249 return nfserr_jukebox;
250 o->len = len;
251 memcpy(o->data, p, len);
252
253 return nfs_ok;
254}
255
000dfa18
CL		 256static __be32
257nfsd4_decode_component4(struct nfsd4_compoundargs *argp, char **namp, u32 *lenp)
258{
259 __be32 *p, status;
260
261 if (xdr_stream_decode_u32(argp->xdr, lenp) < 0)
262 return nfserr_bad_xdr;
263 p = xdr_inline_decode(argp->xdr, *lenp);
264 if (!p)
265 return nfserr_bad_xdr;
266 status = check_filename((char *)p, *lenp);
267 if (status)
268 return status;
269 *namp = svcxdr_tmpalloc(argp, *lenp);
270 if (!*namp)
271 return nfserr_jukebox;
272 memcpy(*namp, p, *lenp);
273
274 return nfs_ok;
275}
276
1c3eff7e
CL		 277static __be32
278nfsd4_decode_nfstime4(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
279{
280 __be32 *p;
281
282 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 3);
283 if (!p)
284 return nfserr_bad_xdr;
285 p = xdr_decode_hyper(p, &tv->tv_sec);
286 tv->tv_nsec = be32_to_cpup(p++);
287 if (tv->tv_nsec >= (u32)1000000000)
288 return nfserr_inval;
289 return nfs_ok;
290}
291
796dd1c6
CL		 292static __be32
293nfsd4_decode_verifier4(struct nfsd4_compoundargs *argp, nfs4_verifier *verf)
294{
295 __be32 *p;
296
297 p = xdr_inline_decode(argp->xdr, NFS4_VERIFIER_SIZE);
298 if (!p)
299 return nfserr_bad_xdr;
300 memcpy(verf->data, p, sizeof(verf->data));
301 return nfs_ok;
302}
303
d1c263a0
CL		 304/**
305 * nfsd4_decode_bitmap4 - Decode an NFSv4 bitmap4
306 * @argp: NFSv4 compound argument structure
307 * @bmval: pointer to an array of u32's to decode into
308 * @bmlen: size of the @bmval array
309 *
310 * The server needs to return nfs_ok rather than nfserr_bad_xdr when
311 * encountering bitmaps containing bits it does not recognize. This
312 * includes bits in bitmap words past WORDn, where WORDn is the last
313 * bitmap WORD the implementation currently supports. Thus we are
314 * careful here to simply ignore bits in bitmap words that this
315 * implementation has yet to support explicitly.
316 *
317 * Return values:
318 * %nfs_ok: @bmval populated successfully
319 * %nfserr_bad_xdr: the encoded bitmap was invalid
320 */
321static __be32
322nfsd4_decode_bitmap4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen)
323{
324 u32 i, count;
325 __be32 *p;
326
327 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
328 return nfserr_bad_xdr;
329 /* request sanity */
330 if (count > 1000)
331 return nfserr_bad_xdr;
332 p = xdr_inline_decode(argp->xdr, count << 2);
333 if (!p)
334 return nfserr_bad_xdr;
335 i = 0;
336 while (i < count)
337 bmval[i++] = be32_to_cpup(p++);
338 while (i < bmlen)
339 bmval[i++] = 0;
340
341 return nfs_ok;
342}
343
c941a968
CL		 344static __be32
345nfsd4_decode_nfsace4(struct nfsd4_compoundargs *argp, struct nfs4_ace *ace)
346{
347 __be32 *p, status;
348 u32 length;
349
350 if (xdr_stream_decode_u32(argp->xdr, &ace->type) < 0)
351 return nfserr_bad_xdr;
352 if (xdr_stream_decode_u32(argp->xdr, &ace->flag) < 0)
353 return nfserr_bad_xdr;
354 if (xdr_stream_decode_u32(argp->xdr, &ace->access_mask) < 0)
355 return nfserr_bad_xdr;
356
357 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
358 return nfserr_bad_xdr;
359 p = xdr_inline_decode(argp->xdr, length);
360 if (!p)
361 return nfserr_bad_xdr;
362 ace->whotype = nfs4_acl_get_whotype((char *)p, length);
363 if (ace->whotype != NFS4_ACL_WHO_NAMED)
364 status = nfs_ok;
365 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
366 status = nfsd_map_name_to_gid(argp->rqstp,
367 (char *)p, length, &ace->who_gid);
368 else
369 status = nfsd_map_name_to_uid(argp->rqstp,
370 (char *)p, length, &ace->who_uid);
371
372 return status;
373}
374
375/* A counted array of nfsace4's */
376static noinline __be32
377nfsd4_decode_acl(struct nfsd4_compoundargs *argp, struct nfs4_acl **acl)
378{
379 struct nfs4_ace *ace;
380 __be32 status;
381 u32 count;
382
383 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
384 return nfserr_bad_xdr;
385
386 if (count > xdr_stream_remaining(argp->xdr) / 20)
387 /*
388 * Even with 4-byte names there wouldn't be
389 * space for that many aces; something fishy is
390 * going on:
391 */
392 return nfserr_fbig;
393
394 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(count));
395 if (*acl == NULL)
396 return nfserr_jukebox;
397
398 (*acl)->naces = count;
399 for (ace = (*acl)->aces; ace < (*acl)->aces + count; ace++) {
400 status = nfsd4_decode_nfsace4(argp, ace);
401 if (status)
402 return status;
403 }
404
405 return nfs_ok;
406}
407
dabe9182
CL		 408static noinline __be32
409nfsd4_decode_security_label(struct nfsd4_compoundargs *argp,
410 struct xdr_netobj *label)
411{
412 u32 lfs, pi, length;
413 __be32 *p;
414
415 if (xdr_stream_decode_u32(argp->xdr, &lfs) < 0)
416 return nfserr_bad_xdr;
417 if (xdr_stream_decode_u32(argp->xdr, &pi) < 0)
418 return nfserr_bad_xdr;
419
420 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
421 return nfserr_bad_xdr;
422 if (length > NFS4_MAXLABELLEN)
423 return nfserr_badlabel;
424 p = xdr_inline_decode(argp->xdr, length);
425 if (!p)
426 return nfserr_bad_xdr;
427 label->len = length;
428 label->data = svcxdr_dupstr(argp, p, length);
429 if (!label->data)
430 return nfserr_jukebox;
431
432 return nfs_ok;
433}
434
b37ad28b 435static __be32
d1c263a0
CL		 436nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen,
437 struct iattr *iattr, struct nfs4_acl **acl,
438 struct xdr_netobj *label, int *umask)
1da177e4 439{
081d53fe
CL		 440 unsigned int starting_pos;
441 u32 attrlist4_count;
d1c263a0 442 __be32 *p, status;
1da177e4 443
1da177e4 444 iattr->ia_valid = 0;
d1c263a0
CL		 445 status = nfsd4_decode_bitmap4(argp, bmval, bmlen);
446 if (status)
447 return nfserr_bad_xdr;
1da177e4 448
e864c189
BF		 449 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
450 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
451 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
452 if (nfsd_attrs_supported(argp->minorversion, bmval))
453 return nfserr_inval;
454 return nfserr_attrnotsupp;
455 }
456
081d53fe
CL		 457 if (xdr_stream_decode_u32(argp->xdr, &attrlist4_count) < 0)
458 return nfserr_bad_xdr;
459 starting_pos = xdr_stream_pos(argp->xdr);
1da177e4
LT		 460
461 if (bmval[0] & FATTR4_WORD0_SIZE) {
2ac1b9b2
CL		 462 u64 size;
463
464 if (xdr_stream_decode_u64(argp->xdr, &size) < 0)
465 return nfserr_bad_xdr;
466 iattr->ia_size = size;
1da177e4
LT		 467 iattr->ia_valid |= ATTR_SIZE;
468 }
469 if (bmval[0] & FATTR4_WORD0_ACL) {
c941a968
CL		 470 status = nfsd4_decode_acl(argp, acl);
471 if (status)
472 return status;
1da177e4
LT		 473 } else
474 *acl = NULL;
475 if (bmval[1] & FATTR4_WORD1_MODE) {
1c8f0ad7
CL		 476 u32 mode;
477
478 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
479 return nfserr_bad_xdr;
480 iattr->ia_mode = mode;
1da177e4
LT		 481 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
482 iattr->ia_valid |= ATTR_MODE;
483 }
484 if (bmval[1] & FATTR4_WORD1_OWNER) {
9853a5ac
CL		 485 u32 length;
486
487 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
488 return nfserr_bad_xdr;
489 p = xdr_inline_decode(argp->xdr, length);
490 if (!p)
491 return nfserr_bad_xdr;
492 status = nfsd_map_name_to_uid(argp->rqstp, (char *)p, length,
493 &iattr->ia_uid);
494 if (status)
47c85291 495 return status;
1da177e4
LT		 496 iattr->ia_valid |= ATTR_UID;
497 }
498 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
393c31dd
CL		 499 u32 length;
500
501 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
502 return nfserr_bad_xdr;
503 p = xdr_inline_decode(argp->xdr, length);
504 if (!p)
505 return nfserr_bad_xdr;
506 status = nfsd_map_name_to_gid(argp->rqstp, (char *)p, length,
507 &iattr->ia_gid);
508 if (status)
47c85291 509 return status;
1da177e4
LT		 510 iattr->ia_valid |= ATTR_GID;
511 }
512 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
1c3eff7e
CL		 513 u32 set_it;
514
515 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
516 return nfserr_bad_xdr;
517 switch (set_it) {
1da177e4 518 case NFS4_SET_TO_CLIENT_TIME:
1c3eff7e 519 status = nfsd4_decode_nfstime4(argp, &iattr->ia_atime);
4c94e13e
CH		 520 if (status)
521 return status;
1da177e4
LT		 522 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
523 break;
524 case NFS4_SET_TO_SERVER_TIME:
525 iattr->ia_valid |= ATTR_ATIME;
526 break;
527 default:
1c3eff7e 528 return nfserr_bad_xdr;
1da177e4
LT		 529 }
530 }
1da177e4 531 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
1c3eff7e
CL		 532 u32 set_it;
533
534 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
535 return nfserr_bad_xdr;
536 switch (set_it) {
1da177e4 537 case NFS4_SET_TO_CLIENT_TIME:
1c3eff7e 538 status = nfsd4_decode_nfstime4(argp, &iattr->ia_mtime);
4c94e13e
CH		 539 if (status)
540 return status;
1da177e4
LT		 541 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
542 break;
543 case NFS4_SET_TO_SERVER_TIME:
544 iattr->ia_valid |= ATTR_MTIME;
545 break;
546 default:
1c3eff7e 547 return nfserr_bad_xdr;
1da177e4
LT		 548 }
549 }
18032ca0 550 label->len = 0;
2285ae76
AB		 551 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
552 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
dabe9182
CL		 553 status = nfsd4_decode_security_label(argp, label);
554 if (status)
555 return status;
18032ca0 556 }
47057abd 557 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
66f0476c
CL		 558 u32 mode, mask;
559
47057abd 560 if (!umask)
66f0476c
CL		 561 return nfserr_bad_xdr;
562 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
563 return nfserr_bad_xdr;
564 iattr->ia_mode = mode & (S_IFMT | S_IALLUGO);
565 if (xdr_stream_decode_u32(argp->xdr, &mask) < 0)
566 return nfserr_bad_xdr;
567 *umask = mask & S_IRWXUGO;
47057abd
AG		 568 iattr->ia_valid |= ATTR_MODE;
569 }
081d53fe
CL		 570
571 /* request sanity: did attrlist4 contain the expected number of words? */
572 if (attrlist4_count != xdr_stream_pos(argp->xdr) - starting_pos)
573 return nfserr_bad_xdr;
1da177e4 574
d1c263a0 575 return nfs_ok;
1da177e4
LT		 576}
577
e31a1b66
BH		 578static __be32
579nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
580{
581 DECODE_HEAD;
582
583 READ_BUF(sizeof(stateid_t));
06553991 584 sid->si_generation = be32_to_cpup(p++);
e31a1b66
BH		 585 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
586
587 DECODE_TAIL;
588}
589
d3d2f381
CL		 590static __be32
591nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid)
592{
593 __be32 *p;
594
595 p = xdr_inline_decode(argp->xdr, NFS4_STATEID_SIZE);
596 if (!p)
597 return nfserr_bad_xdr;
598 sid->si_generation = be32_to_cpup(p++);
599 memcpy(&sid->si_opaque, p, sizeof(sid->si_opaque));
600 return nfs_ok;
601}
602
144e8269
CL		 603static __be32
604nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp, clientid_t *clientid)
605{
606 __be32 *p;
607
608 p = xdr_inline_decode(argp->xdr, sizeof(__be64));
609 if (!p)
610 return nfserr_bad_xdr;
611 memcpy(clientid, p, sizeof(*clientid));
612 return nfs_ok;
613}
614
615static __be32
616nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp,
617 clientid_t *clientid, struct xdr_netobj *owner)
618{
619 __be32 status;
620
621 status = nfsd4_decode_clientid4(argp, clientid);
622 if (status)
623 return status;
624 return nfsd4_decode_opaque(argp, owner);
625}
626
04495971
CL		 627#ifdef CONFIG_NFSD_PNFS
628static __be32
629nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp,
630 struct nfsd4_deviceid *devid)
631{
632 __be32 *p;
633
634 p = xdr_inline_decode(argp->xdr, NFS4_DEVICEID4_SIZE);
635 if (!p)
636 return nfserr_bad_xdr;
637 memcpy(devid, p, sizeof(*devid));
638 return nfs_ok;
639}
5185980d
CL		 640
641static __be32
642nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs *argp,
643 struct nfsd4_layoutcommit *lcp)
644{
645 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_layout_type) < 0)
646 return nfserr_bad_xdr;
647 if (lcp->lc_layout_type < LAYOUT_NFSV4_1_FILES)
648 return nfserr_bad_xdr;
649 if (lcp->lc_layout_type >= LAYOUT_TYPE_MAX)
650 return nfserr_bad_xdr;
651
652 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_up_len) < 0)
653 return nfserr_bad_xdr;
654 if (lcp->lc_up_len > 0) {
655 lcp->lc_up_layout = xdr_inline_decode(argp->xdr, lcp->lc_up_len);
656 if (!lcp->lc_up_layout)
657 return nfserr_bad_xdr;
658 }
659
660 return nfs_ok;
661}
662
645fcad3
CL		 663static __be32
664nfsd4_decode_layoutreturn4(struct nfsd4_compoundargs *argp,
665 struct nfsd4_layoutreturn *lrp)
666{
667 __be32 status;
668
669 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_return_type) < 0)
670 return nfserr_bad_xdr;
671 switch (lrp->lr_return_type) {
672 case RETURN_FILE:
673 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.offset) < 0)
674 return nfserr_bad_xdr;
675 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.length) < 0)
676 return nfserr_bad_xdr;
677 status = nfsd4_decode_stateid4(argp, &lrp->lr_sid);
678 if (status)
679 return status;
680 if (xdr_stream_decode_u32(argp->xdr, &lrp->lrf_body_len) < 0)
681 return nfserr_bad_xdr;
682 if (lrp->lrf_body_len > 0) {
683 lrp->lrf_body = xdr_inline_decode(argp->xdr, lrp->lrf_body_len);
684 if (!lrp->lrf_body)
685 return nfserr_bad_xdr;
686 }
687 break;
688 case RETURN_FSID:
689 case RETURN_ALL:
690 lrp->lr_seg.offset = 0;
691 lrp->lr_seg.length = NFS4_MAX_UINT64;
692 break;
693 default:
694 return nfserr_bad_xdr;
695 }
696
697 return nfs_ok;
698}
699
04495971
CL		 700#endif /* CONFIG_NFSD_PNFS */
701
571e0451
CL		 702static __be32
703nfsd4_decode_sessionid4(struct nfsd4_compoundargs *argp,
704 struct nfs4_sessionid *sessionid)
705{
706 __be32 *p;
707
708 p = xdr_inline_decode(argp->xdr, NFS4_MAX_SESSIONID_LEN);
709 if (!p)
710 return nfserr_bad_xdr;
711 memcpy(sessionid->data, p, sizeof(sessionid->data));
712 return nfs_ok;
713}
714
1a994408
CL		 715/* Defined in Appendix A of RFC 5531 */
716static __be32
717nfsd4_decode_authsys_parms(struct nfsd4_compoundargs *argp,
718 struct nfsd4_cb_sec *cbs)
acb2887e 719{
1a994408
CL		 720 u32 stamp, gidcount, uid, gid;
721 __be32 *p, status;
722
723 if (xdr_stream_decode_u32(argp->xdr, &stamp) < 0)
724 return nfserr_bad_xdr;
725 /* machine name */
726 status = nfsd4_decode_ignored_string(argp, 255);
727 if (status)
728 return status;
729 if (xdr_stream_decode_u32(argp->xdr, &uid) < 0)
730 return nfserr_bad_xdr;
731 if (xdr_stream_decode_u32(argp->xdr, &gid) < 0)
732 return nfserr_bad_xdr;
733 if (xdr_stream_decode_u32(argp->xdr, &gidcount) < 0)
734 return nfserr_bad_xdr;
735 if (gidcount > 16)
736 return nfserr_bad_xdr;
737 p = xdr_inline_decode(argp->xdr, gidcount << 2);
738 if (!p)
739 return nfserr_bad_xdr;
740 if (cbs->flavor == (u32)(-1)) {
741 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
742
743 kuid_t kuid = make_kuid(userns, uid);
744 kgid_t kgid = make_kgid(userns, gid);
745 if (uid_valid(kuid) && gid_valid(kgid)) {
746 cbs->uid = kuid;
747 cbs->gid = kgid;
748 cbs->flavor = RPC_AUTH_UNIX;
749 } else {
750 dprintk("RPC_AUTH_UNIX with invalid uid or gid, ignoring!\n");
751 }
752 }
753
754 return nfs_ok;
755}
756
757static __be32
758nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs *argp,
759 struct nfsd4_cb_sec *cbs)
760{
761 __be32 status;
762 u32 service;
763
764 dprintk("RPC_AUTH_GSS callback secflavor not supported!\n");
765
766 if (xdr_stream_decode_u32(argp->xdr, &service) < 0)
767 return nfserr_bad_xdr;
768 if (service < RPC_GSS_SVC_NONE || service > RPC_GSS_SVC_PRIVACY)
769 return nfserr_bad_xdr;
770 /* gcbp_handle_from_server */
771 status = nfsd4_decode_ignored_string(argp, 0);
772 if (status)
773 return status;
774 /* gcbp_handle_from_client */
775 status = nfsd4_decode_ignored_string(argp, 0);
776 if (status)
777 return status;
778
779 return nfs_ok;
780}
781
782/* a counted array of callback_sec_parms4 items */
783static __be32
784nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
785{
786 u32 i, secflavor, nr_secflavs;
787 __be32 status;
acb2887e
BF		 788
789 /* callback_sec_params4 */
1a994408
CL		 790 if (xdr_stream_decode_u32(argp->xdr, &nr_secflavs) < 0)
791 return nfserr_bad_xdr;
57569a70
BF		 792 if (nr_secflavs)
793 cbs->flavor = (u32)(-1);
794 else
795 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
796 cbs->flavor = 0;
1a994408 797
acb2887e 798 for (i = 0; i < nr_secflavs; ++i) {
1a994408
CL		 799 if (xdr_stream_decode_u32(argp->xdr, &secflavor) < 0)
800 return nfserr_bad_xdr;
801 switch (secflavor) {
acb2887e 802 case RPC_AUTH_NULL:
1a994408 803 /* void */
12fc3e92
BF		 804 if (cbs->flavor == (u32)(-1))
805 cbs->flavor = RPC_AUTH_NULL;
acb2887e
BF		 806 break;
807 case RPC_AUTH_UNIX:
1a994408
CL		 808 status = nfsd4_decode_authsys_parms(argp, cbs);
809 if (status)
810 return status;
acb2887e
BF		 811 break;
812 case RPC_AUTH_GSS:
1a994408
CL		 813 status = nfsd4_decode_gss_cb_handles4(argp, cbs);
814 if (status)
815 return status;
acb2887e
BF		 816 break;
817 default:
acb2887e
BF		 818 return nfserr_inval;
819 }
820 }
1a994408
CL		 821
822 return nfs_ok;
acb2887e
BF		 823}
824
1a994408 825
d169a6a9
CL		 826/*
827 * NFSv4 operation argument decoders
828 */
829
830static __be32
831nfsd4_decode_access(struct nfsd4_compoundargs *argp,
832 struct nfsd4_access *access)
833{
834 if (xdr_stream_decode_u32(argp->xdr, &access->ac_req_access) < 0)
835 return nfserr_bad_xdr;
836 return nfs_ok;
837}
838
b37ad28b 839static __be32
1da177e4
LT		 840nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
841{
d3d2f381
CL		 842 if (xdr_stream_decode_u32(argp->xdr, &close->cl_seqid) < 0)
843 return nfserr_bad_xdr;
844 return nfsd4_decode_stateid4(argp, &close->cl_stateid);
1da177e4
LT		 845}
846
847
b37ad28b 848static __be32
1da177e4
LT		 849nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
850{
cbd9abb3
CL		 851 if (xdr_stream_decode_u64(argp->xdr, &commit->co_offset) < 0)
852 return nfserr_bad_xdr;
853 if (xdr_stream_decode_u32(argp->xdr, &commit->co_count) < 0)
854 return nfserr_bad_xdr;
855 return nfs_ok;
1da177e4
LT		 856}
857
b37ad28b 858static __be32
1da177e4
LT		 859nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
860{
000dfa18 861 __be32 *p, status;
1da177e4 862
000dfa18
CL		 863 if (xdr_stream_decode_u32(argp->xdr, &create->cr_type) < 0)
864 return nfserr_bad_xdr;
1da177e4
LT		 865 switch (create->cr_type) {
866 case NF4LNK:
000dfa18
CL		 867 if (xdr_stream_decode_u32(argp->xdr, &create->cr_datalen) < 0)
868 return nfserr_bad_xdr;
869 p = xdr_inline_decode(argp->xdr, create->cr_datalen);
870 if (!p)
871 return nfserr_bad_xdr;
29c353b3 872 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
7fb84306 873 if (!create->cr_data)
76f47128 874 return nfserr_jukebox;
1da177e4
LT		 875 break;
876 case NF4BLK:
877 case NF4CHR:
000dfa18
CL		 878 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata1) < 0)
879 return nfserr_bad_xdr;
880 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata2) < 0)
881 return nfserr_bad_xdr;
1da177e4
LT		 882 break;
883 case NF4SOCK:
884 case NF4FIFO:
885 case NF4DIR:
886 default:
887 break;
888 }
000dfa18
CL		 889 status = nfsd4_decode_component4(argp, &create->cr_name,
890 &create->cr_namelen);
891 if (status)
1da177e4 892 return status;
d1c263a0
CL		 893 status = nfsd4_decode_fattr4(argp, create->cr_bmval,
894 ARRAY_SIZE(create->cr_bmval),
895 &create->cr_iattr, &create->cr_acl,
896 &create->cr_label, &create->cr_umask);
c0d6fc8a 897 if (status)
000dfa18 898 return status;
1da177e4 899
000dfa18 900 return nfs_ok;
1da177e4
LT		 901}
902
b37ad28b 903static inline __be32
1da177e4
LT		 904nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
905{
95e6482c 906 return nfsd4_decode_stateid4(argp, &dr->dr_stateid);
1da177e4
LT		 907}
908
b37ad28b 909static inline __be32
1da177e4
LT		 910nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
911{
f759eff2
CL		 912 return nfsd4_decode_bitmap4(argp, getattr->ga_bmval,
913 ARRAY_SIZE(getattr->ga_bmval));
1da177e4
LT		 914}
915
b37ad28b 916static __be32
1da177e4
LT		 917nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
918{
5c505d12 919 return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen);
1da177e4
LT		 920}
921
8918cc0d
CL		 922static __be32
923nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp,
924 struct nfsd4_lock *lock)
925{
926 __be32 status;
927
928 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0)
929 return nfserr_bad_xdr;
930 status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid);
931 if (status)
932 return status;
933 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0)
934 return nfserr_bad_xdr;
935 return nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid,
936 &lock->lk_new_owner);
937}
938
939static __be32
940nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp,
941 struct nfsd4_lock *lock)
942{
943 __be32 status;
944
945 status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid);
946 if (status)
947 return status;
948 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0)
949 return nfserr_bad_xdr;
950
951 return nfs_ok;
952}
953
954static __be32
955nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
956{
957 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_is_new) < 0)
958 return nfserr_bad_xdr;
959 if (lock->lk_is_new)
960 return nfsd4_decode_open_to_lock_owner4(argp, lock);
961 return nfsd4_decode_exist_lock_owner4(argp, lock);
962}
963
b37ad28b 964static __be32
1da177e4
LT		 965nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
966{
7c59deed
CL		 967 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_type) < 0)
968 return nfserr_bad_xdr;
1da177e4 969 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
7c59deed
CL		 970 return nfserr_bad_xdr;
971 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_reclaim) < 0)
972 return nfserr_bad_xdr;
973 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_offset) < 0)
974 return nfserr_bad_xdr;
975 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_length) < 0)
976 return nfserr_bad_xdr;
977 return nfsd4_decode_locker4(argp, lock);
1da177e4
LT		 978}
979
b37ad28b 980static __be32
1da177e4
LT		 981nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
982{
0a146f04
CL		 983 if (xdr_stream_decode_u32(argp->xdr, &lockt->lt_type) < 0)
984 return nfserr_bad_xdr;
985 if ((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
986 return nfserr_bad_xdr;
987 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_offset) < 0)
988 return nfserr_bad_xdr;
989 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_length) < 0)
990 return nfserr_bad_xdr;
991 return nfsd4_decode_state_owner4(argp, &lockt->lt_clientid,
992 &lockt->lt_owner);
1da177e4
LT		 993}
994
b37ad28b 995static __be32
1da177e4
LT		 996nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
997{
ca9cf9fc 998 __be32 status;
1da177e4 999
ca9cf9fc
CL		 1000 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_type) < 0)
1001 return nfserr_bad_xdr;
1da177e4 1002 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
ca9cf9fc
CL		 1003 return nfserr_bad_xdr;
1004 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_seqid) < 0)
1005 return nfserr_bad_xdr;
1006 status = nfsd4_decode_stateid4(argp, &locku->lu_stateid);
e31a1b66
BH		 1007 if (status)
1008 return status;
ca9cf9fc
CL		 1009 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_offset) < 0)
1010 return nfserr_bad_xdr;
1011 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_length) < 0)
1012 return nfserr_bad_xdr;
1da177e4 1013
ca9cf9fc 1014 return nfs_ok;
1da177e4
LT		 1015}
1016
b37ad28b 1017static __be32
1da177e4
LT		 1018nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
1019{
3d5877e8 1020 return nfsd4_decode_component4(argp, &lookup->lo_name, &lookup->lo_len);
1da177e4
LT		 1021}
1022
bf33bab3
CL		 1023static __be32
1024nfsd4_decode_createhow4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
1025{
1026 __be32 status;
1027
1028 if (xdr_stream_decode_u32(argp->xdr, &open->op_createmode) < 0)
1029 return nfserr_bad_xdr;
1030 switch (open->op_createmode) {
1031 case NFS4_CREATE_UNCHECKED:
1032 case NFS4_CREATE_GUARDED:
1033 status = nfsd4_decode_fattr4(argp, open->op_bmval,
1034 ARRAY_SIZE(open->op_bmval),
1035 &open->op_iattr, &open->op_acl,
1036 &open->op_label, &open->op_umask);
1037 if (status)
1038 return status;
1039 break;
1040 case NFS4_CREATE_EXCLUSIVE:
1041 status = nfsd4_decode_verifier4(argp, &open->op_verf);
1042 if (status)
1043 return status;
1044 break;
1045 case NFS4_CREATE_EXCLUSIVE4_1:
1046 if (argp->minorversion < 1)
1047 return nfserr_bad_xdr;
1048 status = nfsd4_decode_verifier4(argp, &open->op_verf);
1049 if (status)
1050 return status;
1051 status = nfsd4_decode_fattr4(argp, open->op_bmval,
1052 ARRAY_SIZE(open->op_bmval),
1053 &open->op_iattr, &open->op_acl,
1054 &open->op_label, &open->op_umask);
1055 if (status)
1056 return status;
1057 break;
1058 default:
1059 return nfserr_bad_xdr;
1060 }
1061
1062 return nfs_ok;
1063}
1064
e6ec04b2
CL		 1065static __be32
1066nfsd4_decode_openflag4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
1067{
1068 __be32 status;
1069
1070 if (xdr_stream_decode_u32(argp->xdr, &open->op_create) < 0)
1071 return nfserr_bad_xdr;
1072 switch (open->op_create) {
1073 case NFS4_OPEN_NOCREATE:
1074 break;
1075 case NFS4_OPEN_CREATE:
1076 status = nfsd4_decode_createhow4(argp, open);
1077 if (status)
1078 return status;
1079 break;
1080 default:
1081 return nfserr_bad_xdr;
1082 }
1083
1084 return nfs_ok;
1085}
1086
2c8bd7e0 1087static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
04f9e664 1088{
04f9e664
BF		 1089 u32 w;
1090
9aa62f51
CL		 1091 if (xdr_stream_decode_u32(argp->xdr, &w) < 0)
1092 return nfserr_bad_xdr;
2c8bd7e0
BH		 1093 *share_access = w & NFS4_SHARE_ACCESS_MASK;
1094 *deleg_want = w & NFS4_SHARE_WANT_MASK;
1095 if (deleg_when)
1096 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
1097
04f9e664
BF		 1098 switch (w & NFS4_SHARE_ACCESS_MASK) {
1099 case NFS4_SHARE_ACCESS_READ:
1100 case NFS4_SHARE_ACCESS_WRITE:
1101 case NFS4_SHARE_ACCESS_BOTH:
1102 break;
1103 default:
1104 return nfserr_bad_xdr;
1105 }
fc0d14fe 1106 w &= ~NFS4_SHARE_ACCESS_MASK;
04f9e664
BF		 1107 if (!w)
1108 return nfs_ok;
1109 if (!argp->minorversion)
1110 return nfserr_bad_xdr;
1111 switch (w & NFS4_SHARE_WANT_MASK) {
1112 case NFS4_SHARE_WANT_NO_PREFERENCE:
1113 case NFS4_SHARE_WANT_READ_DELEG:
1114 case NFS4_SHARE_WANT_WRITE_DELEG:
1115 case NFS4_SHARE_WANT_ANY_DELEG:
1116 case NFS4_SHARE_WANT_NO_DELEG:
1117 case NFS4_SHARE_WANT_CANCEL:
1118 break;
1119 default:
1120 return nfserr_bad_xdr;
1121 }
92bac8c5 1122 w &= ~NFS4_SHARE_WANT_MASK;
04f9e664
BF		 1123 if (!w)
1124 return nfs_ok;
2c8bd7e0
BH		 1125
1126 if (!deleg_when) /* open_downgrade */
1127 return nfserr_inval;
04f9e664
BF		 1128 switch (w) {
1129 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
1130 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
c668fc6d
BH		 1131 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
1132 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
04f9e664
BF		 1133 return nfs_ok;
1134 }
04f9e664
BF		 1135 return nfserr_bad_xdr;
1136}
1137
1138static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
1139{
b07bebd9
CL		 1140 if (xdr_stream_decode_u32(argp->xdr, x) < 0)
1141 return nfserr_bad_xdr;
1142 /* Note: unlike access bits, deny bits may be zero. */
01cd4afa 1143 if (*x & ~NFS4_SHARE_DENY_BOTH)
04f9e664 1144 return nfserr_bad_xdr;
b07bebd9 1145
04f9e664 1146 return nfs_ok;
04f9e664
BF		 1147}
1148
1708e50b
CL		 1149static __be32
1150nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp,
1151 struct nfsd4_open *open)
1152{
1153 __be32 status;
1154
1155 if (xdr_stream_decode_u32(argp->xdr, &open->op_claim_type) < 0)
1156 return nfserr_bad_xdr;
1157 switch (open->op_claim_type) {
1158 case NFS4_OPEN_CLAIM_NULL:
1159 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1160 status = nfsd4_decode_component4(argp, &open->op_fname,
1161 &open->op_fnamelen);
1162 if (status)
1163 return status;
1164 break;
1165 case NFS4_OPEN_CLAIM_PREVIOUS:
1166 if (xdr_stream_decode_u32(argp->xdr, &open->op_delegate_type) < 0)
1167 return nfserr_bad_xdr;
1168 break;
1169 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1170 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1171 if (status)
1172 return status;
1173 status = nfsd4_decode_component4(argp, &open->op_fname,
1174 &open->op_fnamelen);
1175 if (status)
1176 return status;
1177 break;
1178 case NFS4_OPEN_CLAIM_FH:
1179 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1180 if (argp->minorversion < 1)
1181 return nfserr_bad_xdr;
1182 /* void */
1183 break;
1184 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1185 if (argp->minorversion < 1)
1186 return nfserr_bad_xdr;
1187 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1188 if (status)
1189 return status;
1190 break;
1191 default:
1192 return nfserr_bad_xdr;
1193 }
1194
1195 return nfs_ok;
1196}
1197
b37ad28b 1198static __be32
1da177e4
LT		 1199nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
1200{
61e5e0b3 1201 __be32 status;
2c8bd7e0 1202 u32 dummy;
1da177e4
LT		 1203
1204 memset(open->op_bmval, 0, sizeof(open->op_bmval));
1205 open->op_iattr.ia_valid = 0;
fe0750e5 1206 open->op_openowner = NULL;
1da177e4 1207
9d313b17 1208 open->op_xdr_error = 0;
61e5e0b3
CL		 1209 if (xdr_stream_decode_u32(argp->xdr, &open->op_seqid) < 0)
1210 return nfserr_bad_xdr;
1211 /* deleg_want is ignored */
2c8bd7e0
BH		 1212 status = nfsd4_decode_share_access(argp, &open->op_share_access,
1213 &open->op_deleg_want, &dummy);
04f9e664 1214 if (status)
61e5e0b3 1215 return status;
04f9e664
BF		 1216 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
1217 if (status)
61e5e0b3
CL		 1218 return status;
1219 status = nfsd4_decode_state_owner4(argp, &open->op_clientid,
1220 &open->op_owner);
a084daf5 1221 if (status)
61e5e0b3 1222 return status;
e6ec04b2
CL		 1223 status = nfsd4_decode_openflag4(argp, open);
1224 if (status)
1225 return status;
61e5e0b3 1226 return nfsd4_decode_open_claim4(argp, open);
1da177e4
LT		 1227}
1228
b37ad28b 1229static __be32
1da177e4
LT		 1230nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1231{
06bee693 1232 __be32 status;
e1a90ebd
AS		 1233
1234 if (argp->minorversion >= 1)
1235 return nfserr_notsupp;
1236
06bee693 1237 status = nfsd4_decode_stateid4(argp, &open_conf->oc_req_stateid);
e31a1b66
BH		 1238 if (status)
1239 return status;
06bee693
CL		 1240 if (xdr_stream_decode_u32(argp->xdr, &open_conf->oc_seqid) < 0)
1241 return nfserr_bad_xdr;
e1a90ebd 1242
06bee693 1243 return nfs_ok;
1da177e4
LT		 1244}
1245
b37ad28b 1246static __be32
1da177e4
LT		 1247nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1248{
dca71651
CL		 1249 __be32 status;
1250
1251 status = nfsd4_decode_stateid4(argp, &open_down->od_stateid);
e31a1b66
BH		 1252 if (status)
1253 return status;
dca71651
CL		 1254 if (xdr_stream_decode_u32(argp->xdr, &open_down->od_seqid) < 0)
1255 return nfserr_bad_xdr;
1256 /* deleg_want is ignored */
2c8bd7e0
BH		 1257 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1258 &open_down->od_deleg_want, NULL);
04f9e664
BF		 1259 if (status)
1260 return status;
dca71651 1261 return nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1da177e4
LT		 1262}
1263
b37ad28b 1264static __be32
1da177e4
LT		 1265nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1266{
a73bed98 1267 __be32 *p;
1da177e4 1268
a73bed98
CL		 1269 if (xdr_stream_decode_u32(argp->xdr, &putfh->pf_fhlen) < 0)
1270 return nfserr_bad_xdr;
1da177e4 1271 if (putfh->pf_fhlen > NFS4_FHSIZE)
a73bed98
CL		 1272 return nfserr_bad_xdr;
1273 p = xdr_inline_decode(argp->xdr, putfh->pf_fhlen);
1274 if (!p)
1275 return nfserr_bad_xdr;
1276 putfh->pf_fhval = svcxdr_tmpalloc(argp, putfh->pf_fhlen);
1277 if (!putfh->pf_fhval)
1278 return nfserr_jukebox;
1279 memcpy(putfh->pf_fhval, p, putfh->pf_fhlen);
1da177e4 1280
a73bed98 1281 return nfs_ok;
1da177e4
LT		 1282}
1283
e1a90ebd
AS		 1284static __be32
1285nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1286{
1287 if (argp->minorversion == 0)
1288 return nfs_ok;
1289 return nfserr_notsupp;
1290}
1291
b37ad28b 1292static __be32
1da177e4
LT		 1293nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1294{
3909c3bc 1295 __be32 status;
1da177e4 1296
3909c3bc 1297 status = nfsd4_decode_stateid4(argp, &read->rd_stateid);
e31a1b66
BH		 1298 if (status)
1299 return status;
3909c3bc
CL		 1300 if (xdr_stream_decode_u64(argp->xdr, &read->rd_offset) < 0)
1301 return nfserr_bad_xdr;
1302 if (xdr_stream_decode_u32(argp->xdr, &read->rd_length) < 0)
1303 return nfserr_bad_xdr;
1da177e4 1304
3909c3bc 1305 return nfs_ok;
1da177e4
LT		 1306}
1307
b37ad28b 1308static __be32
1da177e4
LT		 1309nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1310{
0dfaf2a3 1311 __be32 status;
1da177e4 1312
0dfaf2a3
CL		 1313 if (xdr_stream_decode_u64(argp->xdr, &readdir->rd_cookie) < 0)
1314 return nfserr_bad_xdr;
1315 status = nfsd4_decode_verifier4(argp, &readdir->rd_verf);
1316 if (status)
1317 return status;
1318 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_dircount) < 0)
1319 return nfserr_bad_xdr;
1320 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_maxcount) < 0)
1321 return nfserr_bad_xdr;
1322 if (xdr_stream_decode_uint32_array(argp->xdr, readdir->rd_bmval,
1323 ARRAY_SIZE(readdir->rd_bmval)) < 0)
1324 return nfserr_bad_xdr;
1da177e4 1325
0dfaf2a3 1326 return nfs_ok;
1da177e4
LT		 1327}
1328
b37ad28b 1329static __be32
1da177e4
LT		 1330nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1331{
b7f5fbf2 1332 return nfsd4_decode_component4(argp, &remove->rm_name, &remove->rm_namelen);
1da177e4
LT		 1333}
1334
b37ad28b 1335static __be32
1da177e4
LT		 1336nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1337{
ba881a0a 1338 __be32 status;
1da177e4 1339
ba881a0a
CL		 1340 status = nfsd4_decode_component4(argp, &rename->rn_sname, &rename->rn_snamelen);
1341 if (status)
1da177e4 1342 return status;
ba881a0a 1343 return nfsd4_decode_component4(argp, &rename->rn_tname, &rename->rn_tnamelen);
1da177e4
LT		 1344}
1345
b37ad28b 1346static __be32
1da177e4
LT		 1347nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1348{
d12f9045 1349 return nfsd4_decode_clientid4(argp, clientid);
1da177e4
LT		 1350}
1351
dcb488a3
AA		 1352static __be32
1353nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1354 struct nfsd4_secinfo *secinfo)
1355{
d0abdae5 1356 return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen);
dcb488a3
AA		 1357}
1358
b37ad28b 1359static __be32
1da177e4
LT		 1360nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1361{
e31a1b66 1362 __be32 status;
1da177e4 1363
44592fe9 1364 status = nfsd4_decode_stateid4(argp, &setattr->sa_stateid);
e31a1b66
BH		 1365 if (status)
1366 return status;
d1c263a0
CL		 1367 return nfsd4_decode_fattr4(argp, setattr->sa_bmval,
1368 ARRAY_SIZE(setattr->sa_bmval),
1369 &setattr->sa_iattr, &setattr->sa_acl,
1370 &setattr->sa_label, NULL);
1da177e4
LT		 1371}
1372
b37ad28b 1373static __be32
1da177e4
LT		 1374nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1375{
92fa6c08 1376 __be32 *p, status;
1da177e4 1377
e1a90ebd
AS		 1378 if (argp->minorversion >= 1)
1379 return nfserr_notsupp;
1380
92fa6c08
CL		 1381 status = nfsd4_decode_verifier4(argp, &setclientid->se_verf);
1382 if (status)
1383 return status;
a084daf5
BF		 1384 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1385 if (status)
92fa6c08
CL		 1386 return status;
1387 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_prog) < 0)
a084daf5 1388 return nfserr_bad_xdr;
92fa6c08
CL		 1389 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_netid_len) < 0)
1390 return nfserr_bad_xdr;
1391 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_netid_len);
1392 if (!p)
1393 return nfserr_bad_xdr;
1394 setclientid->se_callback_netid_val = svcxdr_tmpalloc(argp,
1395 setclientid->se_callback_netid_len);
1396 if (!setclientid->se_callback_netid_val)
1397 return nfserr_jukebox;
1398 memcpy(setclientid->se_callback_netid_val, p,
1399 setclientid->se_callback_netid_len);
1da177e4 1400
92fa6c08
CL		 1401 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_addr_len) < 0)
1402 return nfserr_bad_xdr;
1403 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_addr_len);
1404 if (!p)
1405 return nfserr_bad_xdr;
1406 setclientid->se_callback_addr_val = svcxdr_tmpalloc(argp,
1407 setclientid->se_callback_addr_len);
1408 if (!setclientid->se_callback_addr_val)
1409 return nfserr_jukebox;
1410 memcpy(setclientid->se_callback_addr_val, p,
1411 setclientid->se_callback_addr_len);
1412 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_ident) < 0)
1413 return nfserr_bad_xdr;
1da177e4 1414
92fa6c08 1415 return nfs_ok;
1da177e4
LT		 1416}
1417
b37ad28b 1418static __be32
1da177e4
LT		 1419nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1420{
d1ca5514 1421 __be32 status;
1da177e4 1422
e1a90ebd
AS		 1423 if (argp->minorversion >= 1)
1424 return nfserr_notsupp;
1425
d1ca5514
CL		 1426 status = nfsd4_decode_clientid4(argp, &scd_c->sc_clientid);
1427 if (status)
1428 return status;
1429 return nfsd4_decode_verifier4(argp, &scd_c->sc_confirm);
1da177e4
LT		 1430}
1431
1432/* Also used for NVERIFY */
b37ad28b 1433static __be32
1da177e4
LT		 1434nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1435{
67cd453e 1436 __be32 *p, status;
1da177e4 1437
67cd453e
CL		 1438 status = nfsd4_decode_bitmap4(argp, verify->ve_bmval,
1439 ARRAY_SIZE(verify->ve_bmval));
1440 if (status)
1441 return status;
1da177e4
LT		 1442
1443 /* For convenience's sake, we compare raw xdr'd attributes in
e5f95703
BF		 1444 * nfsd4_proc_verify */
1445
67cd453e
CL		 1446 if (xdr_stream_decode_u32(argp->xdr, &verify->ve_attrlen) < 0)
1447 return nfserr_bad_xdr;
1448 p = xdr_inline_decode(argp->xdr, verify->ve_attrlen);
1449 if (!p)
1450 return nfserr_bad_xdr;
1451 verify->ve_attrval = svcxdr_tmpalloc(argp, verify->ve_attrlen);
1452 if (!verify->ve_attrval)
1453 return nfserr_jukebox;
1454 memcpy(verify->ve_attrval, p, verify->ve_attrlen);
1da177e4 1455
67cd453e 1456 return nfs_ok;
1da177e4
LT		 1457}
1458
b37ad28b 1459static __be32
1da177e4
LT		 1460nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1461{
244e2bef 1462 __be32 status;
1da177e4 1463
244e2bef 1464 status = nfsd4_decode_stateid4(argp, &write->wr_stateid);
e31a1b66
BH		 1465 if (status)
1466 return status;
244e2bef
CL		 1467 if (xdr_stream_decode_u64(argp->xdr, &write->wr_offset) < 0)
1468 return nfserr_bad_xdr;
1469 if (xdr_stream_decode_u32(argp->xdr, &write->wr_stable_how) < 0)
1470 return nfserr_bad_xdr;
54bbb7d2 1471 if (write->wr_stable_how > NFS_FILE_SYNC)
244e2bef
CL		 1472 return nfserr_bad_xdr;
1473 if (xdr_stream_decode_u32(argp->xdr, &write->wr_buflen) < 0)
1474 return nfserr_bad_xdr;
c1346a12 1475 if (!xdr_stream_subsegment(argp->xdr, &write->wr_payload, write->wr_buflen))
244e2bef 1476 return nfserr_bad_xdr;
1da177e4 1477
244e2bef 1478 return nfs_ok;
1da177e4
LT		 1479}
1480
b37ad28b 1481static __be32
1da177e4
LT		 1482nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1483{
a4a80c15 1484 __be32 status;
1da177e4 1485
e1a90ebd
AS		 1486 if (argp->minorversion >= 1)
1487 return nfserr_notsupp;
1488
a4a80c15
CL		 1489 status = nfsd4_decode_state_owner4(argp, &rlockowner->rl_clientid,
1490 &rlockowner->rl_owner);
1491 if (status)
1492 return status;
1da177e4 1493
60adfc50
AA		 1494 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1495 return nfserr_inval;
a4a80c15
CL		 1496
1497 return nfs_ok;
1da177e4
LT		 1498}
1499
0f81d960
CL		 1500static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
1501{
1502 if (xdr_stream_decode_u32(argp->xdr, &bc->bc_cb_program) < 0)
1503 return nfserr_bad_xdr;
1504 return nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
1505}
1506
571e0451
CL		 1507static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
1508{
1509 u32 use_conn_in_rdma_mode;
1510 __be32 status;
1511
1512 status = nfsd4_decode_sessionid4(argp, &bcts->sessionid);
1513 if (status)
1514 return status;
1515 if (xdr_stream_decode_u32(argp->xdr, &bcts->dir) < 0)
1516 return nfserr_bad_xdr;
1517 if (xdr_stream_decode_u32(argp->xdr, &use_conn_in_rdma_mode) < 0)
1518 return nfserr_bad_xdr;
1519
1520 return nfs_ok;
1521}
1522
2548aa78
CL		 1523static __be32
1524nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp,
1525 struct nfsd4_exchange_id *exid)
1526{
1527 __be32 status;
1528
1529 status = nfsd4_decode_bitmap4(argp, exid->spo_must_enforce,
1530 ARRAY_SIZE(exid->spo_must_enforce));
1531 if (status)
1532 return nfserr_bad_xdr;
1533 status = nfsd4_decode_bitmap4(argp, exid->spo_must_allow,
1534 ARRAY_SIZE(exid->spo_must_allow));
1535 if (status)
1536 return nfserr_bad_xdr;
1537
1538 return nfs_ok;
1539}
1540
547bfeb4
CL		 1541/*
1542 * This implementation currently does not support SP4_SSV.
1543 * This decoder simply skips over these arguments.
1544 */
1545static noinline __be32
1546nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp,
1547 struct nfsd4_exchange_id *exid)
1548{
1549 u32 count, window, num_gss_handles;
1550 __be32 status;
1551
1552 /* ssp_ops */
1553 status = nfsd4_decode_state_protect_ops(argp, exid);
1554 if (status)
1555 return status;
1556
1557 /* ssp_hash_algs<> */
1558 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1559 return nfserr_bad_xdr;
1560 while (count--) {
1561 status = nfsd4_decode_ignored_string(argp, 0);
1562 if (status)
1563 return status;
1564 }
1565
1566 /* ssp_encr_algs<> */
1567 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1568 return nfserr_bad_xdr;
1569 while (count--) {
1570 status = nfsd4_decode_ignored_string(argp, 0);
1571 if (status)
1572 return status;
1573 }
1574
1575 if (xdr_stream_decode_u32(argp->xdr, &window) < 0)
1576 return nfserr_bad_xdr;
1577 if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0)
1578 return nfserr_bad_xdr;
1579
1580 return nfs_ok;
1581}
1582
2db134eb 1583static __be32
523ec6ed
CL		 1584nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp,
1585 struct nfsd4_exchange_id *exid)
2db134eb 1586{
523ec6ed 1587 __be32 status;
0733d213 1588
523ec6ed 1589 if (xdr_stream_decode_u32(argp->xdr, &exid->spa_how) < 0)
a084daf5 1590 return nfserr_bad_xdr;
0733d213
AA		 1591 switch (exid->spa_how) {
1592 case SP4_NONE:
1593 break;
1594 case SP4_MACH_CRED:
2548aa78 1595 status = nfsd4_decode_state_protect_ops(argp, exid);
ed941643 1596 if (status)
2548aa78 1597 return status;
0733d213
AA		 1598 break;
1599 case SP4_SSV:
547bfeb4 1600 status = nfsd4_decode_ssv_sp_parms(argp, exid);
2548aa78
CL		 1601 if (status)
1602 return status;
0733d213
AA		 1603 break;
1604 default:
523ec6ed 1605 return nfserr_bad_xdr;
0733d213
AA		 1606 }
1607
523ec6ed
CL		 1608 return nfs_ok;
1609}
1610
10ff8422
CL		 1611static __be32
1612nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp,
1613 struct nfsd4_exchange_id *exid)
1614{
1615 __be32 status;
1616 u32 count;
1617
1618 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1619 return nfserr_bad_xdr;
1620 switch (count) {
1621 case 0:
1622 break;
1623 case 1:
1624 /* Note that RFC 8881 places no length limit on
1625 * nii_domain, but this implementation permits no
1626 * more than NFS4_OPAQUE_LIMIT bytes */
1627 status = nfsd4_decode_opaque(argp, &exid->nii_domain);
1628 if (status)
1629 return status;
1630 /* Note that RFC 8881 places no length limit on
1631 * nii_name, but this implementation permits no
1632 * more than NFS4_OPAQUE_LIMIT bytes */
1633 status = nfsd4_decode_opaque(argp, &exid->nii_name);
1634 if (status)
1635 return status;
1636 status = nfsd4_decode_nfstime4(argp, &exid->nii_time);
1637 if (status)
1638 return status;
1639 break;
1640 default:
1641 return nfserr_bad_xdr;
1642 }
1643
1644 return nfs_ok;
1645}
1646
523ec6ed
CL		 1647static __be32
1648nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1649 struct nfsd4_exchange_id *exid)
1650{
10ff8422 1651 __be32 status;
523ec6ed
CL		 1652
1653 status = nfsd4_decode_verifier4(argp, &exid->verifier);
1654 if (status)
1655 return status;
1656 status = nfsd4_decode_opaque(argp, &exid->clname);
1657 if (status)
1658 return status;
1659 if (xdr_stream_decode_u32(argp->xdr, &exid->flags) < 0)
1660 return nfserr_bad_xdr;
1661 status = nfsd4_decode_state_protect4_a(argp, exid);
1662 if (status)
1663 return status;
10ff8422 1664 return nfsd4_decode_nfs_impl_id4(argp, exid);
2db134eb
AA		 1665}
1666
3a3f1fba
CL		 1667static __be32
1668nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp,
1669 struct nfsd4_channel_attrs *ca)
1670{
1671 __be32 *p;
1672
1673 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7);
1674 if (!p)
1675 return nfserr_bad_xdr;
1676
1677 /* headerpadsz is ignored */
1678 p++;
1679 ca->maxreq_sz = be32_to_cpup(p++);
1680 ca->maxresp_sz = be32_to_cpup(p++);
1681 ca->maxresp_cached = be32_to_cpup(p++);
1682 ca->maxops = be32_to_cpup(p++);
1683 ca->maxreqs = be32_to_cpup(p++);
1684 ca->nr_rdma_attrs = be32_to_cpup(p);
1685 switch (ca->nr_rdma_attrs) {
1686 case 0:
1687 break;
1688 case 1:
1689 if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0)
1690 return nfserr_bad_xdr;
1691 break;
1692 default:
1693 return nfserr_bad_xdr;
1694 }
1695
1696 return nfs_ok;
1697}
1698
2db134eb
AA		 1699static __be32
1700nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1701 struct nfsd4_create_session *sess)
1702{
81243e3f 1703 __be32 status;
ec6b5d7b 1704
81243e3f
CL		 1705 status = nfsd4_decode_clientid4(argp, &sess->clientid);
1706 if (status)
1707 return status;
1708 if (xdr_stream_decode_u32(argp->xdr, &sess->seqid) < 0)
1709 return nfserr_bad_xdr;
1710 if (xdr_stream_decode_u32(argp->xdr, &sess->flags) < 0)
1711 return nfserr_bad_xdr;
3a3f1fba
CL		 1712 status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel);
1713 if (status)
1714 return status;
1715 status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel);
81243e3f
CL		 1716 if (status)
1717 return status;
1718 if (xdr_stream_decode_u32(argp->xdr, &sess->callback_prog) < 0)
1719 return nfserr_bad_xdr;
1720 status = nfsd4_decode_cb_sec(argp, &sess->cb_sec);
3a3f1fba
CL		 1721 if (status)
1722 return status;
ec6b5d7b 1723
81243e3f 1724 return nfs_ok;
2db134eb
AA		 1725}
1726
1727static __be32
1728nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1729 struct nfsd4_destroy_session *destroy_session)
1730{
94e254af 1731 return nfsd4_decode_sessionid4(argp, &destroy_session->sessionid);
2db134eb
AA		 1732}
1733
e1ca12df
BS		 1734static __be32
1735nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1736 struct nfsd4_free_stateid *free_stateid)
1737{
aec387d5 1738 return nfsd4_decode_stateid4(argp, &free_stateid->fr_stateid);
e1ca12df
BS		 1739}
1740
9cf514cc
CH		 1741#ifdef CONFIG_NFSD_PNFS
1742static __be32
1743nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1744 struct nfsd4_getdeviceinfo *gdev)
1745{
04495971
CL		 1746 __be32 status;
1747
1748 status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid);
1749 if (status)
1750 return status;
1751 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0)
1752 return nfserr_bad_xdr;
1753 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0)
1754 return nfserr_bad_xdr;
1755 if (xdr_stream_decode_uint32_array(argp->xdr,
1756 &gdev->gd_notify_types, 1) < 0)
1757 return nfserr_bad_xdr;
1758
1759 return nfs_ok;
9cf514cc
CH		 1760}
1761
5185980d
CL		 1762static __be32
1763nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1764 struct nfsd4_layoutcommit *lcp)
1765{
1766 __be32 *p, status;
1767
1768 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0)
1769 return nfserr_bad_xdr;
1770 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0)
1771 return nfserr_bad_xdr;
1772 if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0)
1773 return nfserr_bad_xdr;
1774 status = nfsd4_decode_stateid4(argp, &lcp->lc_sid);
1775 if (status)
1776 return status;
1777 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0)
1778 return nfserr_bad_xdr;
1779 if (lcp->lc_newoffset) {
1780 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0)
1781 return nfserr_bad_xdr;
1782 } else
1783 lcp->lc_last_wr = 0;
1784 p = xdr_inline_decode(argp->xdr, XDR_UNIT);
1785 if (!p)
1786 return nfserr_bad_xdr;
1787 if (xdr_item_is_present(p)) {
1788 status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime);
1789 if (status)
1790 return status;
1791 } else {
1792 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1793 }
1794 return nfsd4_decode_layoutupdate4(argp, lcp);
1795}
1796
9cf514cc
CH		 1797static __be32
1798nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1799 struct nfsd4_layoutget *lgp)
1800{
c8e88e3a 1801 __be32 status;
db59c0ef 1802
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,
1826 struct nfsd4_layoutreturn *lrp)
1827{
645fcad3
CL		 1828 if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0)
1829 return nfserr_bad_xdr;
1830 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0)
1831 return nfserr_bad_xdr;
1832 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0)
1833 return nfserr_bad_xdr;
1834 return nfsd4_decode_layoutreturn4(argp, lrp);
9cf514cc
CH		 1835}
1836#endif /* CONFIG_NFSD_PNFS */
1837
53d70873
CL		 1838static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1839 struct nfsd4_secinfo_no_name *sin)
1840{
1841 if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0)
1842 return nfserr_bad_xdr;
1843 return nfs_ok;
1844}
1845
cf907b11
CL		 1846static __be32
1847nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1848 struct nfsd4_sequence *seq)
1849{
1850 __be32 *p, status;
1851
1852 status = nfsd4_decode_sessionid4(argp, &seq->sessionid);
1853 if (status)
1854 return status;
1855 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4);
1856 if (!p)
1857 return nfserr_bad_xdr;
1858 seq->seqid = be32_to_cpup(p++);
1859 seq->slotid = be32_to_cpup(p++);
1860 seq->maxslots = be32_to_cpup(p++);
1861 seq->cachethis = be32_to_cpup(p);
1862
1863 return nfs_ok;
1864}
1865
b7a0c8f6
CL		 1866static __be32
1867nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1868{
1869 struct nfsd4_test_stateid_id *stateid;
1870 __be32 status;
1871 u32 i;
1872
1873 if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0)
1874 return nfserr_bad_xdr;
1875
1876 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1877 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1878 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1879 if (!stateid)
1880 return nfserrno(-ENOMEM); /* XXX: not jukebox? */
1881 INIT_LIST_HEAD(&stateid->ts_id_list);
1882 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1883 status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid);
1884 if (status)
1885 return status;
1886 }
1887
1888 return nfs_ok;
1889}
1890
c95f2ec3
CL		 1891static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp,
1892 struct nfsd4_destroy_clientid *dc)
1893{
1894 return nfsd4_decode_clientid4(argp, &dc->clientid);
1895}
1896
0d646784
CL		 1897static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp,
1898 struct nfsd4_reclaim_complete *rc)
1899{
1900 if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0)
1901 return nfserr_bad_xdr;
1902 return nfs_ok;
1903}
1904
95d871f0
AS		 1905static __be32
1906nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1907 struct nfsd4_fallocate *fallocate)
1908{
6aef27aa 1909 __be32 status;
95d871f0 1910
6aef27aa 1911 status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid);
95d871f0
AS		 1912 if (status)
1913 return status;
6aef27aa
CL		 1914 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0)
1915 return nfserr_bad_xdr;
1916 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0)
1917 return nfserr_bad_xdr;
95d871f0 1918
6aef27aa 1919 return nfs_ok;
95d871f0
AS		 1920}
1921
ffa0160a
CH		 1922static __be32
1923nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1924{
1925 DECODE_HEAD;
1926
1927 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1928 if (status)
1929 return status;
1930 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1931 if (status)
1932 return status;
1933
1934 READ_BUF(8 + 8 + 8);
1935 p = xdr_decode_hyper(p, &clone->cl_src_pos);
1936 p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1937 p = xdr_decode_hyper(p, &clone->cl_count);
1938 DECODE_TAIL;
1939}
1940
84e1b21d
OK		 1941static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
1942 struct nl4_server *ns)
1943{
84e1b21d 1944 struct nfs42_netaddr *naddr;
f49e4b4d 1945 __be32 *p;
84e1b21d 1946
f49e4b4d
CL		 1947 if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0)
1948 return nfserr_bad_xdr;
84e1b21d
OK		 1949
1950 /* currently support for 1 inter-server source server */
1951 switch (ns->nl4_type) {
1952 case NL4_NETADDR:
1953 naddr = &ns->u.nl4_addr;
1954
f49e4b4d
CL		 1955 if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0)
1956 return nfserr_bad_xdr;
84e1b21d 1957 if (naddr->netid_len > RPCBIND_MAXNETIDLEN)
f49e4b4d 1958 return nfserr_bad_xdr;
84e1b21d 1959
f49e4b4d
CL		 1960 p = xdr_inline_decode(argp->xdr, naddr->netid_len);
1961 if (!p)
1962 return nfserr_bad_xdr;
1963 memcpy(naddr->netid, p, naddr->netid_len);
84e1b21d 1964
f49e4b4d
CL		 1965 if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0)
1966 return nfserr_bad_xdr;
84e1b21d 1967 if (naddr->addr_len > RPCBIND_MAXUADDRLEN)
f49e4b4d 1968 return nfserr_bad_xdr;
84e1b21d 1969
f49e4b4d
CL		 1970 p = xdr_inline_decode(argp->xdr, naddr->addr_len);
1971 if (!p)
1972 return nfserr_bad_xdr;
1973 memcpy(naddr->addr, p, naddr->addr_len);
84e1b21d
OK		 1974 break;
1975 default:
f49e4b4d 1976 return nfserr_bad_xdr;
84e1b21d 1977 }
f49e4b4d
CL		 1978
1979 return nfs_ok;
84e1b21d
OK		 1980}
1981
29ae7f9d
AS		 1982static __be32
1983nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1984{
84e1b21d 1985 struct nl4_server *ns_dummy;
e8febea7
CL		 1986 u32 consecutive, i, count;
1987 __be32 status;
29ae7f9d 1988
e8febea7 1989 status = nfsd4_decode_stateid4(argp, &copy->cp_src_stateid);
29ae7f9d
AS		 1990 if (status)
1991 return status;
e8febea7 1992 status = nfsd4_decode_stateid4(argp, &copy->cp_dst_stateid);
29ae7f9d
AS		 1993 if (status)
1994 return status;
e8febea7
CL		 1995 if (xdr_stream_decode_u64(argp->xdr, &copy->cp_src_pos) < 0)
1996 return nfserr_bad_xdr;
1997 if (xdr_stream_decode_u64(argp->xdr, &copy->cp_dst_pos) < 0)
1998 return nfserr_bad_xdr;
1999 if (xdr_stream_decode_u64(argp->xdr, &copy->cp_count) < 0)
2000 return nfserr_bad_xdr;
2001 /* ca_consecutive: we always do consecutive copies */
2002 if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0)
2003 return nfserr_bad_xdr;
2004 if (xdr_stream_decode_u32(argp->xdr, &copy->cp_synchronous) < 0)
2005 return nfserr_bad_xdr;
29ae7f9d 2006
e8febea7
CL		 2007 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
2008 return nfserr_bad_xdr;
84e1b21d
OK		 2009 copy->cp_intra = false;
2010 if (count == 0) { /* intra-server copy */
2011 copy->cp_intra = true;
e8febea7 2012 return nfs_ok;
84e1b21d
OK		 2013 }
2014
e8febea7 2015 /* decode all the supplied server addresses but use only the first */
84e1b21d
OK		 2016 status = nfsd4_decode_nl4_server(argp, &copy->cp_src);
2017 if (status)
2018 return status;
2019
2020 ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL);
2021 if (ns_dummy == NULL)
e8febea7 2022 return nfserrno(-ENOMEM); /* XXX: jukebox? */
84e1b21d
OK		 2023 for (i = 0; i < count - 1; i++) {
2024 status = nfsd4_decode_nl4_server(argp, ns_dummy);
2025 if (status) {
2026 kfree(ns_dummy);
2027 return status;
2028 }
2029 }
2030 kfree(ns_dummy);
29ae7f9d 2031
e8febea7 2032 return nfs_ok;
29ae7f9d
AS		 2033}
2034
51911868
OK		 2035static __be32
2036nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp,
2037 struct nfsd4_copy_notify *cn)
2038{
5aff7d08 2039 __be32 status;
51911868 2040
f9a953fb 2041 status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid);
51911868
OK		 2042 if (status)
2043 return status;
2044 return nfsd4_decode_nl4_server(argp, &cn->cpn_dst);
2045}
2046
f9a953fb
CL		 2047static __be32
2048nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
2049 struct nfsd4_offload_status *os)
2050{
2846bb05 2051 return nfsd4_decode_stateid4(argp, &os->stateid);
f9a953fb
CL		 2052}
2053
24bab491
AS		 2054static __be32
2055nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
2056{
2057 DECODE_HEAD;
2058
2059 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
2060 if (status)
2061 return status;
2062
2063 READ_BUF(8 + 4);
2064 p = xdr_decode_hyper(p, &seek->seek_offset);
2065 seek->seek_whence = be32_to_cpup(p);
2066
2067 DECODE_TAIL;
2068}
2069
23e50fe3
FL		 2070/*
2071 * XDR data that is more than PAGE_SIZE in size is normally part of a
2072 * read or write. However, the size of extended attributes is limited
2073 * by the maximum request size, and then further limited by the underlying
2074 * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX
2075 * is 64k). Since there is no kvec- or page-based interface to xattrs,
2076 * and we're not dealing with contiguous pages, we need to do some copying.
2077 */
2078
2079/*
c1346a12 2080 * Decode data into buffer.
23e50fe3
FL		 2081 */
2082static __be32
c1346a12
CL		 2083nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr,
2084 char **bufp, u32 buflen)
23e50fe3 2085{
c1346a12
CL		 2086 struct page **pages = xdr->pages;
2087 struct kvec *head = xdr->head;
23e50fe3
FL		 2088 char *tmp, *dp;
2089 u32 len;
2090
2091 if (buflen <= head->iov_len) {
2092 /*
2093 * We're in luck, the head has enough space. Just return
2094 * the head, no need for copying.
2095 */
2096 *bufp = head->iov_base;
2097 return 0;
2098 }
2099
2100 tmp = svcxdr_tmpalloc(argp, buflen);
2101 if (tmp == NULL)
2102 return nfserr_jukebox;
2103
2104 dp = tmp;
2105 memcpy(dp, head->iov_base, head->iov_len);
2106 buflen -= head->iov_len;
2107 dp += head->iov_len;
2108
2109 while (buflen > 0) {
2110 len = min_t(u32, buflen, PAGE_SIZE);
2111 memcpy(dp, page_address(*pages), len);
2112
2113 buflen -= len;
2114 dp += len;
2115 pages++;
2116 }
2117
2118 *bufp = tmp;
2119 return 0;
2120}
2121
2122/*
2123 * Get a user extended attribute name from the XDR buffer.
2124 * It will not have the "user." prefix, so prepend it.
2125 * Lastly, check for nul characters in the name.
2126 */
2127static __be32
2128nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep)
2129{
2130 DECODE_HEAD;
2131 char *name, *sp, *dp;
2132 u32 namelen, cnt;
2133
2134 READ_BUF(4);
2135 namelen = be32_to_cpup(p++);
2136
2137 if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN))
2138 return nfserr_nametoolong;
2139
2140 if (namelen == 0)
2141 goto xdr_error;
2142
2143 READ_BUF(namelen);
2144
2145 name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1);
2146 if (!name)
2147 return nfserr_jukebox;
2148
2149 memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
2150
2151 /*
2152 * Copy the extended attribute name over while checking for 0
2153 * characters.
2154 */
2155 sp = (char *)p;
2156 dp = name + XATTR_USER_PREFIX_LEN;
2157 cnt = namelen;
2158
2159 while (cnt-- > 0) {
2160 if (*sp == '\0')
2161 goto xdr_error;
2162 *dp++ = *sp++;
2163 }
2164 *dp = '\0';
2165
2166 *namep = name;
2167
2168 DECODE_TAIL;
2169}
2170
2171/*
2172 * A GETXATTR op request comes without a length specifier. We just set the
2173 * maximum length for the reply based on XATTR_SIZE_MAX and the maximum
2174 * channel reply size. nfsd_getxattr will probe the length of the xattr,
2175 * check it against getxa_len, and allocate + return the value.
2176 */
2177static __be32
2178nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp,
2179 struct nfsd4_getxattr *getxattr)
2180{
2181 __be32 status;
2182 u32 maxcount;
2183
2184 status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name);
2185 if (status)
2186 return status;
2187
2188 maxcount = svc_max_payload(argp->rqstp);
2189 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2190
2191 getxattr->getxa_len = maxcount;
2192
2193 return status;
2194}
2195
2196static __be32
2197nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp,
2198 struct nfsd4_setxattr *setxattr)
2199{
2200 DECODE_HEAD;
2201 u32 flags, maxcount, size;
23e50fe3
FL		 2202
2203 READ_BUF(4);
2204 flags = be32_to_cpup(p++);
2205
2206 if (flags > SETXATTR4_REPLACE)
2207 return nfserr_inval;
2208 setxattr->setxa_flags = flags;
2209
2210 status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name);
2211 if (status)
2212 return status;
2213
2214 maxcount = svc_max_payload(argp->rqstp);
2215 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2216
2217 READ_BUF(4);
2218 size = be32_to_cpup(p++);
2219 if (size > maxcount)
2220 return nfserr_xattr2big;
2221
2222 setxattr->setxa_len = size;
2223 if (size > 0) {
c1346a12 2224 struct xdr_buf payload;
23e50fe3 2225
c1346a12
CL		 2226 if (!xdr_stream_subsegment(argp->xdr, &payload, size))
2227 goto xdr_error;
2228 status = nfsd4_vbuf_from_vector(argp, &payload,
2229 &setxattr->setxa_buf, size);
23e50fe3
FL		 2230 }
2231
2232 DECODE_TAIL;
2233}
2234
2235static __be32
2236nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp,
2237 struct nfsd4_listxattrs *listxattrs)
2238{
2239 DECODE_HEAD;
2240 u32 maxcount;
2241
2242 READ_BUF(12);
2243 p = xdr_decode_hyper(p, &listxattrs->lsxa_cookie);
2244
2245 /*
2246 * If the cookie is too large to have even one user.x attribute
2247 * plus trailing '\0' left in a maximum size buffer, it's invalid.
2248 */
2249 if (listxattrs->lsxa_cookie >=
2250 (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2)))
2251 return nfserr_badcookie;
2252
2253 maxcount = be32_to_cpup(p++);
2254 if (maxcount < 8)
2255 /* Always need at least 2 words (length and one character) */
2256 return nfserr_inval;
2257
2258 maxcount = min(maxcount, svc_max_payload(argp->rqstp));
2259 listxattrs->lsxa_maxcount = maxcount;
2260
2261 DECODE_TAIL;
2262}
2263
2264static __be32
2265nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp,
2266 struct nfsd4_removexattr *removexattr)
2267{
2268 return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name);
2269}
2270
347e0ad9
BH		 2271static __be32
2272nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
2273{
2274 return nfs_ok;
2275}
2276
3c375c6f
BH		 2277static __be32
2278nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
2279{
1e685ec2 2280 return nfserr_notsupp;
3c375c6f
BH		 2281}
2282
347e0ad9
BH		 2283typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
2284
c1df609d 2285static const nfsd4_dec nfsd4_dec_ops[] = {
ad1060c8
BF		 2286 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
2287 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
2288 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
2289 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
2290 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
2291 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
2292 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
2293 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
2294 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
2295 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
2296 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
2297 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
2298 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
2299 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
2300 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
2301 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
2302 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
2303 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
2304 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
2305 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
e1a90ebd 2306 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
ad1060c8
BF		 2307 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
2308 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
2309 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
2310 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
2311 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
2312 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
2313 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
2314 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
2315 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
2316 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
2317 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
2318 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
2319 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
2320 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
2321 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
2322 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
2db134eb
AA		 2323
2324 /* new operations for NFSv4.1 */
cb73a9f4 2325 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1d1bc8f2 2326 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
9064caae
RD		 2327 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
2328 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
2329 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
e1ca12df 2330 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
9064caae 2331 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
9cf514cc
CH		 2332#ifdef CONFIG_NFSD_PNFS
2333 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
2334 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
2335 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit,
2336 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget,
2337 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn,
2338#else
9064caae
RD		 2339 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
2340 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
2341 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
2342 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
2343 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
9cf514cc 2344#endif
04f4ad16 2345 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
9064caae
RD		 2346 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
2347 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
17456804 2348 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
9064caae 2349 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
345c2842 2350 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
4dc6ec00 2351 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
87a15a80
AS		 2352
2353 /* new operations for NFSv4.2 */
95d871f0 2354 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
29ae7f9d 2355 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy,
51911868 2356 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_copy_notify,
b0cb9085 2357 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
87a15a80
AS		 2358 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
2359 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
2360 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
885e2bf3 2361 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_offload_status,
6308bc98 2362 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_offload_status,
528b8493 2363 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_read,
24bab491 2364 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
87a15a80 2365 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
ffa0160a 2366 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone,
23e50fe3
FL		 2367 /* RFC 8276 extended atributes operations */
2368 [OP_GETXATTR] = (nfsd4_dec)nfsd4_decode_getxattr,
2369 [OP_SETXATTR] = (nfsd4_dec)nfsd4_decode_setxattr,
2370 [OP_LISTXATTRS] = (nfsd4_dec)nfsd4_decode_listxattrs,
2371 [OP_REMOVEXATTR] = (nfsd4_dec)nfsd4_decode_removexattr,
2db134eb
AA		 2372};
2373
e1a90ebd
AS		 2374static inline bool
2375nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
2376{
8217d146 2377 if (op->opnum < FIRST_NFS4_OP)
e1a90ebd 2378 return false;
8217d146 2379 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
e1a90ebd 2380 return false;
8217d146
AS		 2381 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
2382 return false;
2383 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
e1a90ebd
AS		 2384 return false;
2385 return true;
2386}
f2feb96b 2387
b37ad28b 2388static __be32
1da177e4
LT		 2389nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
2390{
2391 DECODE_HEAD;
2392 struct nfsd4_op *op;
1091006c 2393 bool cachethis = false;
a5cddc88
BF		 2394 int auth_slack= argp->rqstp->rq_auth_slack;
2395 int max_reply = auth_slack + 8; /* opcnt, status */
b0e35fda
BF		 2396 int readcount = 0;
2397 int readbytes = 0;
1da177e4
LT		 2398 int i;
2399
1da177e4 2400 READ_BUF(4);
06553991 2401 argp->taglen = be32_to_cpup(p++);
4aed9c46 2402 READ_BUF(argp->taglen);
1da177e4 2403 SAVEMEM(argp->tag, argp->taglen);
4aed9c46 2404 READ_BUF(8);
06553991
BF		 2405 argp->minorversion = be32_to_cpup(p++);
2406 argp->opcnt = be32_to_cpup(p++);
4f0cefbf 2407 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1da177e4
LT		 2408
2409 if (argp->taglen > NFSD4_MAX_TAGLEN)
2410 goto xdr_error;
0078117c
BF		 2411 /*
2412 * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
2413 * here, so we return success at the xdr level so that
2414 * nfsd4_proc can handle this is an NFS-level error.
2415 */
2416 if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
2417 return 0;
1da177e4 2418
e8c96f8c 2419 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
5d6031ca 2420 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1da177e4
LT		 2421 if (!argp->ops) {
2422 argp->ops = argp->iops;
817cb9d4 2423 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1da177e4
LT		 2424 goto xdr_error;
2425 }
2426 }
2427
e1a90ebd 2428 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
30cff1ff
BH		 2429 argp->opcnt = 0;
2430
1da177e4
LT		 2431 for (i = 0; i < argp->opcnt; i++) {
2432 op = &argp->ops[i];
2433 op->replay = NULL;
2434
8a61b18c 2435 READ_BUF(4);
06553991 2436 op->opnum = be32_to_cpup(p++);
1da177e4 2437
08281341 2438 if (nfsd4_opnum_in_range(argp, op)) {
e1a90ebd 2439 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
08281341
CL		 2440 if (op->status != nfs_ok)
2441 trace_nfsd_compound_decode_err(argp->rqstp,
2442 argp->opcnt, i,
2443 op->opnum,
2444 op->status);
2445 } else {
1da177e4
LT		 2446 op->opnum = OP_ILLEGAL;
2447 op->status = nfserr_op_illegal;
1da177e4 2448 }
f4f9ef4a 2449 op->opdesc = OPDESC(op);
1091006c
BF		 2450 /*
2451 * We'll try to cache the result in the DRC if any one
2452 * op in the compound wants to be cached:
2453 */
2454 cachethis |= nfsd4_cache_this_op(op);
6ff40dec 2455
528b8493 2456 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) {
b0e35fda
BF		 2457 readcount++;
2458 readbytes += nfsd4_max_reply(argp->rqstp, op);
2459 } else
2460 max_reply += nfsd4_max_reply(argp->rqstp, op);
f7b43d0c 2461 /*
7323f0d2
KM		 2462 * OP_LOCK and OP_LOCKT may return a conflicting lock.
2463 * (Special case because it will just skip encoding this
2464 * if it runs out of xdr buffer space, and it is the only
2465 * operation that behaves this way.)
f7b43d0c 2466 */
7323f0d2 2467 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
f7b43d0c 2468 max_reply += NFS4_OPAQUE_LIMIT;
e372ba60
BF		 2469
2470 if (op->status) {
2471 argp->opcnt = i+1;
2472 break;
2473 }
1da177e4 2474 }
1091006c
BF		 2475 /* Sessions make the DRC unnecessary: */
2476 if (argp->minorversion)
2477 cachethis = false;
b0e35fda 2478 svc_reserve(argp->rqstp, max_reply + readbytes);
1091006c 2479 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1da177e4 2480
a5cddc88 2481 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
779fb0f3 2482 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
b0e35fda 2483
1da177e4
LT		 2484 DECODE_TAIL;
2485}
1da177e4 2486
b8800921
N		 2487static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
2488 struct svc_export *exp)
c654b8a9 2489{
b8800921
N		 2490 if (exp->ex_flags & NFSEXP_V4ROOT) {
2491 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
2492 *p++ = 0;
2493 } else if (IS_I_VERSION(inode)) {
39ca1bf6 2494 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
c654b8a9 2495 } else {
d05d5744
BF		 2496 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2497 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
c654b8a9 2498 }
d05d5744 2499 return p;
c654b8a9
BF		 2500}
2501
16945141
BF		 2502/*
2503 * ctime (in NFSv4, time_metadata) is not writeable, and the client
2504 * doesn't really care what resolution could theoretically be stored by
2505 * the filesystem.
2506 *
2507 * The client cares how close together changes can be while still
2508 * guaranteeing ctime changes. For most filesystems (which have
2509 * timestamps with nanosecond fields) that is limited by the resolution
2510 * of the time returned from current_time() (which I'm assuming to be
2511 * 1/HZ).
2512 */
2513static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2514{
e4598e38 2515 struct timespec64 ts;
16945141
BF		 2516 u32 ns;
2517
2518 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
e4598e38 2519 ts = ns_to_timespec64(ns);
16945141
BF		 2520
2521 p = xdr_encode_hyper(p, ts.tv_sec);
2522 *p++ = cpu_to_be32(ts.tv_nsec);
2523
2524 return p;
2525}
2526
d05d5744 2527static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
c654b8a9 2528{
d05d5744 2529 *p++ = cpu_to_be32(c->atomic);
c654b8a9 2530 if (c->change_supported) {
d05d5744
BF		 2531 p = xdr_encode_hyper(p, c->before_change);
2532 p = xdr_encode_hyper(p, c->after_change);
c654b8a9 2533 } else {
d05d5744
BF		 2534 *p++ = cpu_to_be32(c->before_ctime_sec);
2535 *p++ = cpu_to_be32(c->before_ctime_nsec);
2536 *p++ = cpu_to_be32(c->after_ctime_sec);
2537 *p++ = cpu_to_be32(c->after_ctime_nsec);
c654b8a9 2538 }
d05d5744 2539 return p;
c654b8a9 2540}
1da177e4 2541
81c3f413 2542/* Encode as an array of strings the string given with components
e7a0444a 2543 * separated @sep, escaped with esc_enter and esc_exit.
81c3f413 2544 */
ddd1ea56
BF		 2545static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2546 char *components, char esc_enter,
2547 char esc_exit)
81c3f413 2548{
ddd1ea56 2549 __be32 *p;
082d4bd7
BF		 2550 __be32 pathlen;
2551 int pathlen_offset;
81c3f413 2552 int strlen, count=0;
e7a0444a 2553 char *str, *end, *next;
81c3f413
BF		 2554
2555 dprintk("nfsd4_encode_components(%s)\n", components);
082d4bd7
BF		 2556
2557 pathlen_offset = xdr->buf->len;
ddd1ea56
BF		 2558 p = xdr_reserve_space(xdr, 4);
2559 if (!p)
81c3f413 2560 return nfserr_resource;
082d4bd7
BF		 2561 p++; /* We will fill this in with @count later */
2562
81c3f413
BF		 2563 end = str = components;
2564 while (*end) {
e7a0444a
WAA		 2565 bool found_esc = false;
2566
2567 /* try to parse as esc_start, ..., esc_end, sep */
2568 if (*str == esc_enter) {
2569 for (; *end && (*end != esc_exit); end++)
2570 /* find esc_exit or end of string */;
2571 next = end + 1;
2572 if (*end && (!*next || *next == sep)) {
2573 str++;
2574 found_esc = true;
2575 }
2576 }
2577
2578 if (!found_esc)
2579 for (; *end && (*end != sep); end++)
2580 /* find sep or end of string */;
2581
81c3f413
BF		 2582 strlen = end - str;
2583 if (strlen) {
ddd1ea56
BF		 2584 p = xdr_reserve_space(xdr, strlen + 4);
2585 if (!p)
81c3f413 2586 return nfserr_resource;
0c0c267b 2587 p = xdr_encode_opaque(p, str, strlen);
81c3f413
BF		 2588 count++;
2589 }
2590 else
2591 end++;
5a64e569
BC		 2592 if (found_esc)
2593 end = next;
2594
81c3f413
BF		 2595 str = end;
2596 }
bf7491f1 2597 pathlen = htonl(count);
082d4bd7 2598 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
81c3f413
BF		 2599 return 0;
2600}
2601
e7a0444a
WAA		 2602/* Encode as an array of strings the string given with components
2603 * separated @sep.
2604 */
ddd1ea56
BF		 2605static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2606 char *components)
e7a0444a 2607{
ddd1ea56 2608 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
e7a0444a
WAA		 2609}
2610
81c3f413
BF		 2611/*
2612 * encode a location element of a fs_locations structure
2613 */
ddd1ea56
BF		 2614static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2615 struct nfsd4_fs_location *location)
81c3f413 2616{
b37ad28b 2617 __be32 status;
81c3f413 2618
ddd1ea56 2619 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
e7a0444a 2620 '[', ']');
81c3f413
BF		 2621 if (status)
2622 return status;
ddd1ea56 2623 status = nfsd4_encode_components(xdr, '/', location->path);
81c3f413
BF		 2624 if (status)
2625 return status;
81c3f413
BF		 2626 return 0;
2627}
2628
2629/*
ed748aac 2630 * Encode a path in RFC3530 'pathname4' format
81c3f413 2631 */
ddd1ea56
BF		 2632static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2633 const struct path *root,
2634 const struct path *path)
81c3f413 2635{
301f0268 2636 struct path cur = *path;
ddd1ea56 2637 __be32 *p;
ed748aac
TM		 2638 struct dentry **components = NULL;
2639 unsigned int ncomponents = 0;
2640 __be32 err = nfserr_jukebox;
81c3f413 2641
ed748aac 2642 dprintk("nfsd4_encode_components(");
81c3f413 2643
ed748aac
TM		 2644 path_get(&cur);
2645 /* First walk the path up to the nfsd root, and store the
2646 * dentries/path components in an array.
2647 */
2648 for (;;) {
b77a4b2e 2649 if (path_equal(&cur, root))
ed748aac
TM		 2650 break;
2651 if (cur.dentry == cur.mnt->mnt_root) {
2652 if (follow_up(&cur))
2653 continue;
2654 goto out_free;
2655 }
2656 if ((ncomponents & 15) == 0) {
2657 struct dentry **new;
2658 new = krealloc(components,
2659 sizeof(*new) * (ncomponents + 16),
2660 GFP_KERNEL);
2661 if (!new)
2662 goto out_free;
2663 components = new;
2664 }
2665 components[ncomponents++] = cur.dentry;
2666 cur.dentry = dget_parent(cur.dentry);
2667 }
ddd1ea56
BF		 2668 err = nfserr_resource;
2669 p = xdr_reserve_space(xdr, 4);
2670 if (!p)
ed748aac 2671 goto out_free;
c373b0a4 2672 *p++ = cpu_to_be32(ncomponents);
ed748aac
TM		 2673
2674 while (ncomponents) {
2675 struct dentry *dentry = components[ncomponents - 1];
301f0268 2676 unsigned int len;
ed748aac 2677
301f0268
AV		 2678 spin_lock(&dentry->d_lock);
2679 len = dentry->d_name.len;
ddd1ea56
BF		 2680 p = xdr_reserve_space(xdr, len + 4);
2681 if (!p) {
301f0268 2682 spin_unlock(&dentry->d_lock);
ed748aac 2683 goto out_free;
301f0268 2684 }
0c0c267b 2685 p = xdr_encode_opaque(p, dentry->d_name.name, len);
a455589f 2686 dprintk("/%pd", dentry);
301f0268 2687 spin_unlock(&dentry->d_lock);
ed748aac
TM		 2688 dput(dentry);
2689 ncomponents--;
81c3f413 2690 }
ed748aac 2691
ed748aac
TM		 2692 err = 0;
2693out_free:
2694 dprintk(")\n");
2695 while (ncomponents)
2696 dput(components[--ncomponents]);
2697 kfree(components);
2698 path_put(&cur);
2699 return err;
2700}
2701
ddd1ea56
BF		 2702static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2703 struct svc_rqst *rqstp, const struct path *path)
ed748aac
TM		 2704{
2705 struct svc_export *exp_ps;
2706 __be32 res;
2707
2708 exp_ps = rqst_find_fsidzero_export(rqstp);
2709 if (IS_ERR(exp_ps))
2710 return nfserrno(PTR_ERR(exp_ps));
ddd1ea56 2711 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
ed748aac
TM		 2712 exp_put(exp_ps);
2713 return res;
81c3f413
BF		 2714}
2715
2716/*
2717 * encode a fs_locations structure
2718 */
ddd1ea56
BF		 2719static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2720 struct svc_rqst *rqstp, struct svc_export *exp)
81c3f413 2721{
b37ad28b 2722 __be32 status;
cc45f017 2723 int i;
ddd1ea56 2724 __be32 *p;
81c3f413 2725 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
81c3f413 2726
ddd1ea56 2727 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
81c3f413
BF		 2728 if (status)
2729 return status;
ddd1ea56
BF		 2730 p = xdr_reserve_space(xdr, 4);
2731 if (!p)
81c3f413 2732 return nfserr_resource;
c373b0a4 2733 *p++ = cpu_to_be32(fslocs->locations_count);
81c3f413 2734 for (i=0; i<fslocs->locations_count; i++) {
ddd1ea56 2735 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
81c3f413
BF		 2736 if (status)
2737 return status;
2738 }
81c3f413
BF		 2739 return 0;
2740}
1da177e4 2741
3d2544b1
BF		 2742static u32 nfs4_file_type(umode_t mode)
2743{
2744 switch (mode & S_IFMT) {
2745 case S_IFIFO: return NF4FIFO;
2746 case S_IFCHR: return NF4CHR;
2747 case S_IFDIR: return NF4DIR;
2748 case S_IFBLK: return NF4BLK;
2749 case S_IFLNK: return NF4LNK;
2750 case S_IFREG: return NF4REG;
2751 case S_IFSOCK: return NF4SOCK;
2752 default: return NF4BAD;
25fef48b 2753 }
3d2544b1 2754}
1da177e4 2755
b37ad28b 2756static inline __be32
ddd1ea56
BF		 2757nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2758 struct nfs4_ace *ace)
1da177e4 2759{
3554116d 2760 if (ace->whotype != NFS4_ACL_WHO_NAMED)
ddd1ea56 2761 return nfs4_acl_write_who(xdr, ace->whotype);
3554116d 2762 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
ddd1ea56 2763 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
3554116d 2764 else
ddd1ea56 2765 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1da177e4
LT		 2766}
2767
6896f15a 2768static inline __be32
8a4c3926 2769nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
6896f15a 2770{
8a4c3926
JL		 2771 __be32 *p;
2772 unsigned long i = hweight_long(layout_types);
6896f15a 2773
8a4c3926
JL		 2774 p = xdr_reserve_space(xdr, 4 + 4 * i);
2775 if (!p)
2776 return nfserr_resource;
2777
2778 *p++ = cpu_to_be32(i);
2779
2780 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2781 if (layout_types & (1 << i))
2782 *p++ = cpu_to_be32(i);
6896f15a
KM		 2783
2784 return 0;
2785}
2786
42ca0993
BF		 2787#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2788 FATTR4_WORD0_RDATTR_ERROR)
2789#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
c2227a39 2790#define WORD2_ABSENT_FS_ATTRS 0
42ca0993 2791
18032ca0
DQ		 2792#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2793static inline __be32
ddd1ea56
BF		 2794nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2795 void *context, int len)
18032ca0 2796{
ddd1ea56 2797 __be32 *p;
18032ca0 2798
ddd1ea56
BF		 2799 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2800 if (!p)
18032ca0
DQ		 2801 return nfserr_resource;
2802
2803 /*
2804 * For now we use a 0 here to indicate the null translation; in
2805 * the future we may place a call to translation code here.
2806 */
c373b0a4
BF		 2807 *p++ = cpu_to_be32(0); /* lfs */
2808 *p++ = cpu_to_be32(0); /* pi */
18032ca0 2809 p = xdr_encode_opaque(p, context, len);
18032ca0
DQ		 2810 return 0;
2811}
2812#else
2813static inline __be32
ddd1ea56
BF		 2814nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2815 void *context, int len)
18032ca0
DQ		 2816{ return 0; }
2817#endif
2818
c2227a39 2819static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
42ca0993
BF		 2820{
2821 /* As per referral draft: */
2822 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2823 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2824 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2825 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2826 *rdattr_err = NFSERR_MOVED;
2827 else
2828 return nfserr_moved;
2829 }
2830 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2831 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
c2227a39 2832 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
42ca0993
BF		 2833 return 0;
2834}
1da177e4 2835
ae7095a7
BF		 2836
2837static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2838{
2839 struct path path = exp->ex_path;
2840 int err;
2841
2842 path_get(&path);
2843 while (follow_up(&path)) {
2844 if (path.dentry != path.mnt->mnt_root)
2845 break;
2846 }
a528d35e 2847 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
ae7095a7
BF		 2848 path_put(&path);
2849 return err;
2850}
2851
75976de6
KM		 2852static __be32
2853nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2854{
2855 __be32 *p;
2856
2857 if (bmval2) {
2858 p = xdr_reserve_space(xdr, 16);
2859 if (!p)
2860 goto out_resource;
2861 *p++ = cpu_to_be32(3);
2862 *p++ = cpu_to_be32(bmval0);
2863 *p++ = cpu_to_be32(bmval1);
2864 *p++ = cpu_to_be32(bmval2);
2865 } else if (bmval1) {
2866 p = xdr_reserve_space(xdr, 12);
2867 if (!p)
2868 goto out_resource;
2869 *p++ = cpu_to_be32(2);
2870 *p++ = cpu_to_be32(bmval0);
2871 *p++ = cpu_to_be32(bmval1);
2872 } else {
2873 p = xdr_reserve_space(xdr, 8);
2874 if (!p)
2875 goto out_resource;
2876 *p++ = cpu_to_be32(1);
2877 *p++ = cpu_to_be32(bmval0);
2878 }
2879
2880 return 0;
2881out_resource:
2882 return nfserr_resource;
2883}
2884
1da177e4
LT		 2885/*
2886 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2887 * ourselves.
1da177e4 2888 */
da2ebce6 2889static __be32
d5184658
BF		 2890nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2891 struct svc_export *exp,
2892 struct dentry *dentry, u32 *bmval,
406a7ea9 2893 struct svc_rqst *rqstp, int ignore_crossmnt)
1da177e4
LT		 2894{
2895 u32 bmval0 = bmval[0];
2896 u32 bmval1 = bmval[1];
7e705706 2897 u32 bmval2 = bmval[2];
1da177e4 2898 struct kstat stat;
d50e6136 2899 struct svc_fh *tempfh = NULL;
1da177e4 2900 struct kstatfs statfs;
ddd1ea56 2901 __be32 *p;
1fcea5b2 2902 int starting_len = xdr->buf->len;
082d4bd7
BF		 2903 int attrlen_offset;
2904 __be32 attrlen;
1da177e4
LT		 2905 u32 dummy;
2906 u64 dummy64;
42ca0993 2907 u32 rdattr_err = 0;
b37ad28b 2908 __be32 status;
b8dd7b9a 2909 int err;
1da177e4 2910 struct nfs4_acl *acl = NULL;
0ab88ca4 2911#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
18032ca0
DQ		 2912 void *context = NULL;
2913 int contextlen;
0ab88ca4 2914#endif
18032ca0 2915 bool contextsupport = false;
7e705706
AA		 2916 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2917 u32 minorversion = resp->cstate.minorversion;
ebabe9a9
CH		 2918 struct path path = {
2919 .mnt = exp->ex_path.mnt,
2920 .dentry = dentry,
2921 };
3d733711 2922 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1da177e4
LT		 2923
2924 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
916d2d84 2925 BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
1da177e4 2926
42ca0993 2927 if (exp->ex_fslocs.migrated) {
c2227a39 2928 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
42ca0993
BF		 2929 if (status)
2930 goto out;
2931 }
2932
a528d35e 2933 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
b8dd7b9a 2934 if (err)
1da177e4 2935 goto out_nfserr;
12337901
CH		 2936 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2937 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
1da177e4
LT		 2938 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2939 FATTR4_WORD1_SPACE_TOTAL))) {
ebabe9a9 2940 err = vfs_statfs(&path, &statfs);
b8dd7b9a 2941 if (err)
1da177e4
LT		 2942 goto out_nfserr;
2943 }
2944 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
d50e6136
BF		 2945 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2946 status = nfserr_jukebox;
2947 if (!tempfh)
2948 goto out;
2949 fh_init(tempfh, NFS4_FHSIZE);
2950 status = fh_compose(tempfh, exp, dentry, NULL);
1da177e4
LT		 2951 if (status)
2952 goto out;
d50e6136 2953 fhp = tempfh;
1da177e4 2954 }
0c9d65e7 2955 if (bmval0 & FATTR4_WORD0_ACL) {
b8dd7b9a 2956 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
0c9d65e7
AG		 2957 if (err == -EOPNOTSUPP)
2958 bmval0 &= ~FATTR4_WORD0_ACL;
2959 else if (err == -EINVAL) {
2960 status = nfserr_attrnotsupp;
2961 goto out;
2962 } else if (err != 0)
2963 goto out_nfserr;
1da177e4 2964 }
1da177e4 2965
18032ca0 2966#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
c2227a39
KM		 2967 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2968 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
32ddd944
BF		 2969 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2970 err = security_inode_getsecctx(d_inode(dentry),
18032ca0 2971 &context, &contextlen);
32ddd944
BF		 2972 else
2973 err = -EOPNOTSUPP;
18032ca0
DQ		 2974 contextsupport = (err == 0);
2975 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2976 if (err == -EOPNOTSUPP)
2977 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2978 else if (err)
2979 goto out_nfserr;
2980 }
2981 }
2982#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2983
75976de6
KM		 2984 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2985 if (status)
2986 goto out;
082d4bd7
BF		 2987
2988 attrlen_offset = xdr->buf->len;
ddd1ea56
BF		 2989 p = xdr_reserve_space(xdr, 4);
2990 if (!p)
2991 goto out_resource;
082d4bd7 2992 p++; /* to be backfilled later */
1da177e4
LT		 2993
2994 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
dcd20869
BF		 2995 u32 supp[3];
2996
2997 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
7e705706 2998
0c9d65e7 2999 if (!IS_POSIXACL(dentry->d_inode))
916d2d84 3000 supp[0] &= ~FATTR4_WORD0_ACL;
18032ca0 3001 if (!contextsupport)
916d2d84
BF		 3002 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3003 if (!supp[2]) {
ddd1ea56
BF		 3004 p = xdr_reserve_space(xdr, 12);
3005 if (!p)
2b44f1ba 3006 goto out_resource;
c373b0a4 3007 *p++ = cpu_to_be32(2);
916d2d84
BF		 3008 *p++ = cpu_to_be32(supp[0]);
3009 *p++ = cpu_to_be32(supp[1]);
7e705706 3010 } else {
ddd1ea56
BF		 3011 p = xdr_reserve_space(xdr, 16);
3012 if (!p)
2b44f1ba 3013 goto out_resource;
c373b0a4 3014 *p++ = cpu_to_be32(3);
916d2d84
BF		 3015 *p++ = cpu_to_be32(supp[0]);
3016 *p++ = cpu_to_be32(supp[1]);
3017 *p++ = cpu_to_be32(supp[2]);
7e705706 3018 }
1da177e4
LT		 3019 }
3020 if (bmval0 & FATTR4_WORD0_TYPE) {
ddd1ea56
BF		 3021 p = xdr_reserve_space(xdr, 4);
3022 if (!p)
1da177e4 3023 goto out_resource;
3d2544b1 3024 dummy = nfs4_file_type(stat.mode);
6b6d8137
BF		 3025 if (dummy == NF4BAD) {
3026 status = nfserr_serverfault;
3027 goto out;
3028 }
c373b0a4 3029 *p++ = cpu_to_be32(dummy);
1da177e4
LT		 3030 }
3031 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
ddd1ea56
BF		 3032 p = xdr_reserve_space(xdr, 4);
3033 if (!p)
1da177e4 3034 goto out_resource;
49640001 3035 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
c373b0a4 3036 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
49640001 3037 else
c373b0a4
BF		 3038 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
3039 NFS4_FH_VOL_RENAME);
1da177e4
LT		 3040 }
3041 if (bmval0 & FATTR4_WORD0_CHANGE) {
ddd1ea56
BF		 3042 p = xdr_reserve_space(xdr, 8);
3043 if (!p)
1da177e4 3044 goto out_resource;
b8800921 3045 p = encode_change(p, &stat, d_inode(dentry), exp);
1da177e4
LT		 3046 }
3047 if (bmval0 & FATTR4_WORD0_SIZE) {
ddd1ea56
BF		 3048 p = xdr_reserve_space(xdr, 8);
3049 if (!p)
1da177e4 3050 goto out_resource;
b64c7f3b 3051 p = xdr_encode_hyper(p, stat.size);
1da177e4
LT		 3052 }
3053 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
ddd1ea56
BF		 3054 p = xdr_reserve_space(xdr, 4);
3055 if (!p)
1da177e4 3056 goto out_resource;
c373b0a4 3057 *p++ = cpu_to_be32(1);
1da177e4
LT		 3058 }
3059 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
ddd1ea56
BF		 3060 p = xdr_reserve_space(xdr, 4);
3061 if (!p)
1da177e4 3062 goto out_resource;
c373b0a4 3063 *p++ = cpu_to_be32(1);
1da177e4
LT		 3064 }
3065 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
ddd1ea56
BF		 3066 p = xdr_reserve_space(xdr, 4);
3067 if (!p)
1da177e4 3068 goto out_resource;
c373b0a4 3069 *p++ = cpu_to_be32(0);
1da177e4
LT		 3070 }
3071 if (bmval0 & FATTR4_WORD0_FSID) {
ddd1ea56
BF		 3072 p = xdr_reserve_space(xdr, 16);
3073 if (!p)
1da177e4 3074 goto out_resource;
42ca0993 3075 if (exp->ex_fslocs.migrated) {
b64c7f3b
BF		 3076 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
3077 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
af6a4e28
N		 3078 } else switch(fsid_source(fhp)) {
3079 case FSIDSOURCE_FSID:
b64c7f3b
BF		 3080 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
3081 p = xdr_encode_hyper(p, (u64)0);
af6a4e28
N		 3082 break;
3083 case FSIDSOURCE_DEV:
c373b0a4
BF		 3084 *p++ = cpu_to_be32(0);
3085 *p++ = cpu_to_be32(MAJOR(stat.dev));
3086 *p++ = cpu_to_be32(0);
3087 *p++ = cpu_to_be32(MINOR(stat.dev));
af6a4e28
N		 3088 break;
3089 case FSIDSOURCE_UUID:
94eb3689
KM		 3090 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
3091 EX_UUID_LEN);
af6a4e28 3092 break;
1da177e4
LT		 3093 }
3094 }
3095 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
ddd1ea56
BF		 3096 p = xdr_reserve_space(xdr, 4);
3097 if (!p)
1da177e4 3098 goto out_resource;
c373b0a4 3099 *p++ = cpu_to_be32(0);
1da177e4
LT		 3100 }
3101 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
ddd1ea56
BF		 3102 p = xdr_reserve_space(xdr, 4);
3103 if (!p)
1da177e4 3104 goto out_resource;
c373b0a4 3105 *p++ = cpu_to_be32(nn->nfsd4_lease);
1da177e4
LT		 3106 }
3107 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
ddd1ea56
BF		 3108 p = xdr_reserve_space(xdr, 4);
3109 if (!p)
1da177e4 3110 goto out_resource;
c373b0a4 3111 *p++ = cpu_to_be32(rdattr_err);
1da177e4
LT		 3112 }
3113 if (bmval0 & FATTR4_WORD0_ACL) {
3114 struct nfs4_ace *ace;
1da177e4
LT		 3115
3116 if (acl == NULL) {
ddd1ea56
BF		 3117 p = xdr_reserve_space(xdr, 4);
3118 if (!p)
1da177e4
LT		 3119 goto out_resource;
3120
c373b0a4 3121 *p++ = cpu_to_be32(0);
1da177e4
LT		 3122 goto out_acl;
3123 }
ddd1ea56
BF		 3124 p = xdr_reserve_space(xdr, 4);
3125 if (!p)
1da177e4 3126 goto out_resource;
c373b0a4 3127 *p++ = cpu_to_be32(acl->naces);
1da177e4 3128
28e05dd8 3129 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
ddd1ea56
BF		 3130 p = xdr_reserve_space(xdr, 4*3);
3131 if (!p)
1da177e4 3132 goto out_resource;
c373b0a4
BF		 3133 *p++ = cpu_to_be32(ace->type);
3134 *p++ = cpu_to_be32(ace->flag);
3135 *p++ = cpu_to_be32(ace->access_mask &
3136 NFS4_ACE_MASK_ALL);
ddd1ea56 3137 status = nfsd4_encode_aclname(xdr, rqstp, ace);
1da177e4
LT		 3138 if (status)
3139 goto out;
3140 }
3141 }
3142out_acl:
3143 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
ddd1ea56
BF		 3144 p = xdr_reserve_space(xdr, 4);
3145 if (!p)
1da177e4 3146 goto out_resource;
0c9d65e7 3147 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
1da177e4
LT		 3148 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
3149 }
3150 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
ddd1ea56
BF		 3151 p = xdr_reserve_space(xdr, 4);
3152 if (!p)
1da177e4 3153 goto out_resource;
c373b0a4 3154 *p++ = cpu_to_be32(1);
1da177e4
LT		 3155 }
3156 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
ddd1ea56
BF		 3157 p = xdr_reserve_space(xdr, 4);
3158 if (!p)
1da177e4 3159 goto out_resource;
c373b0a4 3160 *p++ = cpu_to_be32(0);
1da177e4
LT		 3161 }
3162 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
ddd1ea56
BF		 3163 p = xdr_reserve_space(xdr, 4);
3164 if (!p)
1da177e4 3165 goto out_resource;
c373b0a4 3166 *p++ = cpu_to_be32(1);
1da177e4
LT		 3167 }
3168 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
ddd1ea56
BF		 3169 p = xdr_reserve_space(xdr, 4);
3170 if (!p)
1da177e4 3171 goto out_resource;
c373b0a4 3172 *p++ = cpu_to_be32(1);
1da177e4
LT		 3173 }
3174 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
ddd1ea56
BF		 3175 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
3176 if (!p)
1da177e4 3177 goto out_resource;
0c0c267b
BF		 3178 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
3179 fhp->fh_handle.fh_size);
1da177e4
LT		 3180 }
3181 if (bmval0 & FATTR4_WORD0_FILEID) {
ddd1ea56
BF		 3182 p = xdr_reserve_space(xdr, 8);
3183 if (!p)
1da177e4 3184 goto out_resource;
b64c7f3b 3185 p = xdr_encode_hyper(p, stat.ino);
1da177e4
LT		 3186 }
3187 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
ddd1ea56
BF		 3188 p = xdr_reserve_space(xdr, 8);
3189 if (!p)
1da177e4 3190 goto out_resource;
b64c7f3b 3191 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
1da177e4
LT		 3192 }
3193 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
ddd1ea56
BF		 3194 p = xdr_reserve_space(xdr, 8);
3195 if (!p)
1da177e4 3196 goto out_resource;
b64c7f3b 3197 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
1da177e4
LT		 3198 }
3199 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
ddd1ea56
BF		 3200 p = xdr_reserve_space(xdr, 8);
3201 if (!p)
1da177e4 3202 goto out_resource;
b64c7f3b 3203 p = xdr_encode_hyper(p, (u64) statfs.f_files);
1da177e4 3204 }
81c3f413 3205 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
ddd1ea56 3206 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
81c3f413
BF		 3207 if (status)
3208 goto out;
3209 }
1da177e4 3210 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
ddd1ea56
BF		 3211 p = xdr_reserve_space(xdr, 4);
3212 if (!p)
1da177e4 3213 goto out_resource;
c373b0a4 3214 *p++ = cpu_to_be32(1);
1da177e4
LT		 3215 }
3216 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
ddd1ea56
BF		 3217 p = xdr_reserve_space(xdr, 8);
3218 if (!p)
1da177e4 3219 goto out_resource;
b64c7f3b 3220 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
1da177e4
LT		 3221 }
3222 if (bmval0 & FATTR4_WORD0_MAXLINK) {
ddd1ea56
BF		 3223 p = xdr_reserve_space(xdr, 4);
3224 if (!p)
1da177e4 3225 goto out_resource;
c373b0a4 3226 *p++ = cpu_to_be32(255);
1da177e4
LT		 3227 }
3228 if (bmval0 & FATTR4_WORD0_MAXNAME) {
ddd1ea56
BF		 3229 p = xdr_reserve_space(xdr, 4);
3230 if (!p)
1da177e4 3231 goto out_resource;
c373b0a4 3232 *p++ = cpu_to_be32(statfs.f_namelen);
1da177e4
LT		 3233 }
3234 if (bmval0 & FATTR4_WORD0_MAXREAD) {
ddd1ea56
BF		 3235 p = xdr_reserve_space(xdr, 8);
3236 if (!p)
1da177e4 3237 goto out_resource;
b64c7f3b 3238 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
1da177e4
LT		 3239 }
3240 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
ddd1ea56
BF		 3241 p = xdr_reserve_space(xdr, 8);
3242 if (!p)
1da177e4 3243 goto out_resource;
b64c7f3b 3244 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
1da177e4
LT		 3245 }
3246 if (bmval1 & FATTR4_WORD1_MODE) {
ddd1ea56
BF		 3247 p = xdr_reserve_space(xdr, 4);
3248 if (!p)
1da177e4 3249 goto out_resource;
c373b0a4 3250 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
1da177e4
LT		 3251 }
3252 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
ddd1ea56
BF		 3253 p = xdr_reserve_space(xdr, 4);
3254 if (!p)
1da177e4 3255 goto out_resource;
c373b0a4 3256 *p++ = cpu_to_be32(1);
1da177e4
LT		 3257 }
3258 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
ddd1ea56
BF		 3259 p = xdr_reserve_space(xdr, 4);
3260 if (!p)
1da177e4 3261 goto out_resource;
c373b0a4 3262 *p++ = cpu_to_be32(stat.nlink);
1da177e4
LT		 3263 }
3264 if (bmval1 & FATTR4_WORD1_OWNER) {
ddd1ea56 3265 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
1da177e4
LT		 3266 if (status)
3267 goto out;
3268 }
3269 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
ddd1ea56 3270 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
1da177e4
LT		 3271 if (status)
3272 goto out;
3273 }
3274 if (bmval1 & FATTR4_WORD1_RAWDEV) {
ddd1ea56
BF		 3275 p = xdr_reserve_space(xdr, 8);
3276 if (!p)
1da177e4 3277 goto out_resource;
c373b0a4
BF		 3278 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
3279 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
1da177e4
LT		 3280 }
3281 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
ddd1ea56
BF		 3282 p = xdr_reserve_space(xdr, 8);
3283 if (!p)
1da177e4
LT		 3284 goto out_resource;
3285 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
b64c7f3b 3286 p = xdr_encode_hyper(p, dummy64);
1da177e4
LT		 3287 }
3288 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
ddd1ea56
BF		 3289 p = xdr_reserve_space(xdr, 8);
3290 if (!p)
1da177e4
LT		 3291 goto out_resource;
3292 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
b64c7f3b 3293 p = xdr_encode_hyper(p, dummy64);
1da177e4
LT		 3294 }
3295 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
ddd1ea56
BF		 3296 p = xdr_reserve_space(xdr, 8);
3297 if (!p)
1da177e4
LT		 3298 goto out_resource;
3299 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
b64c7f3b 3300 p = xdr_encode_hyper(p, dummy64);
1da177e4
LT		 3301 }
3302 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
ddd1ea56
BF		 3303 p = xdr_reserve_space(xdr, 8);
3304 if (!p)
1da177e4
LT		 3305 goto out_resource;
3306 dummy64 = (u64)stat.blocks << 9;
b64c7f3b 3307 p = xdr_encode_hyper(p, dummy64);
1da177e4
LT		 3308 }
3309 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
ddd1ea56
BF		 3310 p = xdr_reserve_space(xdr, 12);
3311 if (!p)
1da177e4 3312 goto out_resource;
b64c7f3b 3313 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
c373b0a4 3314 *p++ = cpu_to_be32(stat.atime.tv_nsec);
1da177e4
LT		 3315 }
3316 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
ddd1ea56
BF		 3317 p = xdr_reserve_space(xdr, 12);
3318 if (!p)
1da177e4 3319 goto out_resource;
16945141 3320 p = encode_time_delta(p, d_inode(dentry));
1da177e4
LT		 3321 }
3322 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
ddd1ea56
BF		 3323 p = xdr_reserve_space(xdr, 12);
3324 if (!p)
1da177e4 3325 goto out_resource;
b64c7f3b 3326 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
c373b0a4 3327 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
1da177e4
LT		 3328 }
3329 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
ddd1ea56
BF		 3330 p = xdr_reserve_space(xdr, 12);
3331 if (!p)
1da177e4 3332 goto out_resource;
b64c7f3b 3333 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
c373b0a4 3334 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
1da177e4
LT		 3335 }
3336 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
0a2050d7
KM		 3337 struct kstat parent_stat;
3338 u64 ino = stat.ino;
3339
ddd1ea56
BF		 3340 p = xdr_reserve_space(xdr, 8);
3341 if (!p)
1da177e4 3342 goto out_resource;
406a7ea9
FF		 3343 /*
3344 * Get parent's attributes if not ignoring crossmount
3345 * and this is the root of a cross-mounted filesystem.
3346 */
3347 if (ignore_crossmnt == 0 &&
0a2050d7
KM		 3348 dentry == exp->ex_path.mnt->mnt_root) {
3349 err = get_parent_attributes(exp, &parent_stat);
3350 if (err)
3351 goto out_nfserr;
3352 ino = parent_stat.ino;
3353 }
3354 p = xdr_encode_hyper(p, ino);
1da177e4 3355 }
9cf514cc 3356#ifdef CONFIG_NFSD_PNFS
6896f15a 3357 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
8a4c3926 3358 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
6896f15a
KM		 3359 if (status)
3360 goto out;
3361 }
3362
3363 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
8a4c3926 3364 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
6896f15a
KM		 3365 if (status)
3366 goto out;
9cf514cc
CH		 3367 }
3368
3369 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
3370 p = xdr_reserve_space(xdr, 4);
3371 if (!p)
3372 goto out_resource;
3373 *p++ = cpu_to_be32(stat.blksize);
3374 }
3375#endif /* CONFIG_NFSD_PNFS */
8c18f205 3376 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
b26b78cb
TM		 3377 u32 supp[3];
3378
3379 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
3380 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
3381 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
3382 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
3383
3384 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
75976de6
KM		 3385 if (status)
3386 goto out;
8c18f205 3387 }
7e705706 3388
a8585763
BF		 3389 if (bmval2 & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
3390 p = xdr_reserve_space(xdr, 4);
3391 if (!p)
3392 goto out_resource;
3393 if (IS_I_VERSION(d_inode(dentry)))
3394 *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR);
3395 else
3396 *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_TIME_METADATA);
3397 }
3398
0ab88ca4 3399#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
7d580722
KM		 3400 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
3401 status = nfsd4_encode_security_label(xdr, rqstp, context,
3402 contextlen);
3403 if (status)
3404 goto out;
3405 }
0ab88ca4 3406#endif
7d580722 3407
0e885e84
FL		 3408 if (bmval2 & FATTR4_WORD2_XATTR_SUPPORT) {
3409 p = xdr_reserve_space(xdr, 4);
3410 if (!p)
3411 goto out_resource;
3412 err = xattr_supported_namespace(d_inode(dentry),
3413 XATTR_USER_PREFIX);
3414 *p++ = cpu_to_be32(err == 0);
3415 }
3416
082d4bd7
BF		 3417 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
3418 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
1da177e4
LT		 3419 status = nfs_ok;
3420
3421out:
ba4e55bb 3422#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
18032ca0
DQ		 3423 if (context)
3424 security_release_secctx(context, contextlen);
ba4e55bb 3425#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
28e05dd8 3426 kfree(acl);
18df11d0 3427 if (tempfh) {
d50e6136 3428 fh_put(tempfh);
18df11d0
YZ		 3429 kfree(tempfh);
3430 }
1fcea5b2
BF		 3431 if (status)
3432 xdr_truncate_encode(xdr, starting_len);
1da177e4
LT		 3433 return status;
3434out_nfserr:
b8dd7b9a 3435 status = nfserrno(err);
1da177e4
LT		 3436 goto out;
3437out_resource:
1da177e4
LT		 3438 status = nfserr_resource;
3439 goto out;
1da177e4
LT		 3440}
3441
2825a7f9
BF		 3442static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3443 struct xdr_buf *buf, __be32 *p, int bytes)
3444{
3445 xdr->scratch.iov_len = 0;
3446 memset(buf, 0, sizeof(struct xdr_buf));
3447 buf->head[0].iov_base = p;
3448 buf->head[0].iov_len = 0;
3449 buf->len = 0;
3450 xdr->buf = buf;
3451 xdr->iov = buf->head;
3452 xdr->p = p;
3453 xdr->end = (void *)p + bytes;
3454 buf->buflen = bytes;
3455}
3456
d5184658
BF		 3457__be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3458 struct svc_fh *fhp, struct svc_export *exp,
3459 struct dentry *dentry, u32 *bmval,
3460 struct svc_rqst *rqstp, int ignore_crossmnt)
3461{
2825a7f9 3462 struct xdr_buf dummy;
d5184658
BF		 3463 struct xdr_stream xdr;
3464 __be32 ret;
3465
2825a7f9 3466 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
d5184658
BF		 3467 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
3468 ignore_crossmnt);
3469 *p = xdr.p;
3470 return ret;
3471}
3472
c0ce6ec8
BF		 3473static inline int attributes_need_mount(u32 *bmval)
3474{
3475 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3476 return 1;
3477 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3478 return 1;
3479 return 0;
3480}
3481
b37ad28b 3482static __be32
561f0ed4
BF		 3483nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
3484 const char *name, int namlen)
1da177e4
LT		 3485{
3486 struct svc_export *exp = cd->rd_fhp->fh_export;
3487 struct dentry *dentry;
b37ad28b 3488 __be32 nfserr;
406a7ea9 3489 int ignore_crossmnt = 0;
1da177e4 3490
6c2d4798 3491 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
1da177e4
LT		 3492 if (IS_ERR(dentry))
3493 return nfserrno(PTR_ERR(dentry));
3494
3495 exp_get(exp);
406a7ea9
FF		 3496 /*
3497 * In the case of a mountpoint, the client may be asking for
3498 * attributes that are only properties of the underlying filesystem
3499 * as opposed to the cross-mounted file system. In such a case,
3500 * we will not follow the cross mount and will fill the attribtutes
3501 * directly from the mountpoint dentry.
3502 */
3227fa41 3503 if (nfsd_mountpoint(dentry, exp)) {
021d3a72
BF		 3504 int err;
3505
3227fa41
BF		 3506 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3507 && !attributes_need_mount(cd->rd_bmval)) {
3508 ignore_crossmnt = 1;
3509 goto out_encode;
3510 }
dcb488a3
AA		 3511 /*
3512 * Why the heck aren't we just using nfsd_lookup??
3513 * Different "."/".." handling? Something else?
3514 * At least, add a comment here to explain....
3515 */
021d3a72
BF		 3516 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3517 if (err) {
3518 nfserr = nfserrno(err);
1da177e4
LT		 3519 goto out_put;
3520 }
dcb488a3
AA		 3521 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3522 if (nfserr)
3523 goto out_put;
1da177e4
LT		 3524
3525 }
3227fa41 3526out_encode:
561f0ed4 3527 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
406a7ea9 3528 cd->rd_rqstp, ignore_crossmnt);
1da177e4
LT		 3529out_put:
3530 dput(dentry);
3531 exp_put(exp);
3532 return nfserr;
3533}
3534
2ebbc012 3535static __be32 *
561f0ed4 3536nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
1da177e4 3537{
561f0ed4
BF		 3538 __be32 *p;
3539
c3a45617 3540 p = xdr_reserve_space(xdr, 20);
561f0ed4 3541 if (!p)
1da177e4
LT		 3542 return NULL;
3543 *p++ = htonl(2);
3544 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3545 *p++ = htonl(0); /* bmval1 */
3546
87915c64 3547 *p++ = htonl(4); /* attribute length */
1da177e4 3548 *p++ = nfserr; /* no htonl */
1da177e4
LT		 3549 return p;
3550}
3551
3552static int
a0ad13ef
N		 3553nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3554 loff_t offset, u64 ino, unsigned int d_type)
1da177e4 3555{
a0ad13ef 3556 struct readdir_cd *ccd = ccdv;
1da177e4 3557 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
561f0ed4
BF		 3558 struct xdr_stream *xdr = cd->xdr;
3559 int start_offset = xdr->buf->len;
3560 int cookie_offset;
aee37764 3561 u32 name_and_cookie;
561f0ed4 3562 int entry_bytes;
b37ad28b 3563 __be32 nfserr = nfserr_toosmall;
561f0ed4
BF		 3564 __be64 wire_offset;
3565 __be32 *p;
1da177e4
LT		 3566
3567 /* In nfsv4, "." and ".." never make it onto the wire.. */
3568 if (name && isdotent(name, namlen)) {
3569 cd->common.err = nfs_ok;
3570 return 0;
3571 }
3572
561f0ed4
BF		 3573 if (cd->cookie_offset) {
3574 wire_offset = cpu_to_be64(offset);
3575 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3576 &wire_offset, 8);
3577 }
1da177e4 3578
561f0ed4
BF		 3579 p = xdr_reserve_space(xdr, 4);
3580 if (!p)
1da177e4 3581 goto fail;
1da177e4 3582 *p++ = xdr_one; /* mark entry present */
561f0ed4
BF		 3583 cookie_offset = xdr->buf->len;
3584 p = xdr_reserve_space(xdr, 3*4 + namlen);
3585 if (!p)
3586 goto fail;
1da177e4
LT		 3587 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
3588 p = xdr_encode_array(p, name, namlen); /* name length & name */
3589
561f0ed4 3590 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
1da177e4
LT		 3591 switch (nfserr) {
3592 case nfs_ok:
1da177e4
LT		 3593 break;
3594 case nfserr_resource:
3595 nfserr = nfserr_toosmall;
3596 goto fail;
b2c0cea6 3597 case nfserr_noent:
f41c5ad2 3598 xdr_truncate_encode(xdr, start_offset);
b2c0cea6 3599 goto skip_entry;
1da177e4
LT		 3600 default:
3601 /*
3602 * If the client requested the RDATTR_ERROR attribute,
3603 * we stuff the error code into this attribute
3604 * and continue. If this attribute was not requested,
3605 * then in accordance with the spec, we fail the
3606 * entire READDIR operation(!)
3607 */
3608 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3609 goto fail;
561f0ed4 3610 p = nfsd4_encode_rdattr_error(xdr, nfserr);
34081efc
FI		 3611 if (p == NULL) {
3612 nfserr = nfserr_toosmall;
1da177e4 3613 goto fail;
34081efc 3614 }
1da177e4 3615 }
561f0ed4
BF		 3616 nfserr = nfserr_toosmall;
3617 entry_bytes = xdr->buf->len - start_offset;
3618 if (entry_bytes > cd->rd_maxcount)
3619 goto fail;
3620 cd->rd_maxcount -= entry_bytes;
aee37764
BF		 3621 /*
3622 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3623 * let's always let through the first entry, at least:
3624 */
0ec016e3
BF		 3625 if (!cd->rd_dircount)
3626 goto fail;
3627 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
aee37764
BF		 3628 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3629 goto fail;
3630 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
0ec016e3 3631
561f0ed4 3632 cd->cookie_offset = cookie_offset;
b2c0cea6 3633skip_entry:
1da177e4
LT		 3634 cd->common.err = nfs_ok;
3635 return 0;
3636fail:
561f0ed4 3637 xdr_truncate_encode(xdr, start_offset);
1da177e4
LT		 3638 cd->common.err = nfserr;
3639 return -EINVAL;
3640}
3641
d0a381dd
BF		 3642static __be32
3643nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
e2f282b9 3644{
bc749ca4 3645 __be32 *p;
e2f282b9 3646
d0a381dd
BF		 3647 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3648 if (!p)
3649 return nfserr_resource;
c373b0a4 3650 *p++ = cpu_to_be32(sid->si_generation);
0c0c267b
BF		 3651 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3652 sizeof(stateid_opaque_t));
d0a381dd 3653 return 0;
e2f282b9
BH		 3654}
3655
695e12f8 3656static __be32
b37ad28b 3657nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
1da177e4 3658{
d0a381dd 3659 struct xdr_stream *xdr = &resp->xdr;
bc749ca4 3660 __be32 *p;
1da177e4 3661
bac966d6
BF		 3662 p = xdr_reserve_space(xdr, 8);
3663 if (!p)
3664 return nfserr_resource;
3665 *p++ = cpu_to_be32(access->ac_supported);
3666 *p++ = cpu_to_be32(access->ac_resp_access);
3667 return 0;
1da177e4
LT		 3668}
3669
1d1bc8f2
BF		 3670static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3671{
d0a381dd 3672 struct xdr_stream *xdr = &resp->xdr;
1d1bc8f2
BF		 3673 __be32 *p;
3674
bac966d6
BF		 3675 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3676 if (!p)
3677 return nfserr_resource;
3678 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3679 NFS4_MAX_SESSIONID_LEN);
3680 *p++ = cpu_to_be32(bcts->dir);
3681 /* Upshifting from TCP to RDMA is not supported */
3682 *p++ = cpu_to_be32(0);
3683 return 0;
1d1bc8f2
BF		 3684}
3685
695e12f8 3686static __be32
b37ad28b 3687nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
1da177e4 3688{
d0a381dd
BF		 3689 struct xdr_stream *xdr = &resp->xdr;
3690
bac966d6 3691 return nfsd4_encode_stateid(xdr, &close->cl_stateid);
1da177e4
LT		 3692}
3693
3694
695e12f8 3695static __be32
b37ad28b 3696nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
1da177e4 3697{
d0a381dd 3698 struct xdr_stream *xdr = &resp->xdr;
bc749ca4 3699 __be32 *p;
1da177e4 3700
bac966d6
BF		 3701 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3702 if (!p)
3703 return nfserr_resource;
3704 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
0c0c267b 3705 NFS4_VERIFIER_SIZE);
bac966d6 3706 return 0;
1da177e4
LT		 3707}
3708
695e12f8 3709static __be32
b37ad28b 3710nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
1da177e4 3711{
d0a381dd 3712 struct xdr_stream *xdr = &resp->xdr;
bc749ca4 3713 __be32 *p;
1da177e4 3714
bac966d6
BF		 3715 p = xdr_reserve_space(xdr, 20);
3716 if (!p)
3717 return nfserr_resource;
3718 encode_cinfo(p, &create->cr_cinfo);
b96811cd 3719 return nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
bac966d6 3720 create->cr_bmval[1], create->cr_bmval[2]);
1da177e4
LT		 3721}
3722
b37ad28b
AV		 3723static __be32
3724nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
1da177e4
LT		 3725{
3726 struct svc_fh *fhp = getattr->ga_fhp;
d5184658 3727 struct xdr_stream *xdr = &resp->xdr;
1da177e4 3728
bac966d6
BF		 3729 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3730 getattr->ga_bmval, resp->rqstp, 0);
1da177e4
LT		 3731}
3732
695e12f8
BH		 3733static __be32
3734nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
1da177e4 3735{
d0a381dd 3736 struct xdr_stream *xdr = &resp->xdr;
695e12f8 3737 struct svc_fh *fhp = *fhpp;
1da177e4 3738 unsigned int len;
bc749ca4 3739 __be32 *p;
1da177e4 3740
bac966d6
BF		 3741 len = fhp->fh_handle.fh_size;
3742 p = xdr_reserve_space(xdr, len + 4);
3743 if (!p)
3744 return nfserr_resource;
3745 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3746 return 0;
1da177e4
LT		 3747}
3748
3749/*
3750* Including all fields other than the name, a LOCK4denied structure requires
3751* 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3752*/
d0a381dd
BF		 3753static __be32
3754nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
1da177e4 3755{
7c13f344 3756 struct xdr_netobj *conf = &ld->ld_owner;
bc749ca4 3757 __be32 *p;
1da177e4 3758
8c7424cf 3759again:
d0a381dd 3760 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
8c7424cf
BF		 3761 if (!p) {
3762 /*
3763 * Don't fail to return the result just because we can't
3764 * return the conflicting open:
3765 */
3766 if (conf->len) {
f98bac5a 3767 kfree(conf->data);
8c7424cf
BF		 3768 conf->len = 0;
3769 conf->data = NULL;
3770 goto again;
3771 }
d0a381dd 3772 return nfserr_resource;
8c7424cf 3773 }
b64c7f3b
BF		 3774 p = xdr_encode_hyper(p, ld->ld_start);
3775 p = xdr_encode_hyper(p, ld->ld_length);
c373b0a4 3776 *p++ = cpu_to_be32(ld->ld_type);
7c13f344 3777 if (conf->len) {
0c0c267b
BF		 3778 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3779 p = xdr_encode_opaque(p, conf->data, conf->len);
f98bac5a 3780 kfree(conf->data);
1da177e4 3781 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
b64c7f3b 3782 p = xdr_encode_hyper(p, (u64)0); /* clientid */
c373b0a4 3783 *p++ = cpu_to_be32(0); /* length of owner name */
1da177e4 3784 }
d0a381dd 3785 return nfserr_denied;
1da177e4
LT		 3786}
3787
695e12f8 3788static __be32
b37ad28b 3789nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
1da177e4 3790{
d0a381dd
BF		 3791 struct xdr_stream *xdr = &resp->xdr;
3792
e2f282b9 3793 if (!nfserr)
d0a381dd 3794 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
e2f282b9 3795 else if (nfserr == nfserr_denied)
d0a381dd 3796 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
f98bac5a 3797
695e12f8 3798 return nfserr;
1da177e4
LT		 3799}
3800
695e12f8 3801static __be32
b37ad28b 3802nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
1da177e4 3803{
d0a381dd
BF		 3804 struct xdr_stream *xdr = &resp->xdr;
3805
1da177e4 3806 if (nfserr == nfserr_denied)
d0a381dd 3807 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
695e12f8 3808 return nfserr;
1da177e4
LT		 3809}
3810
695e12f8 3811static __be32
b37ad28b 3812nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
1da177e4 3813{
d0a381dd
BF		 3814 struct xdr_stream *xdr = &resp->xdr;
3815
bac966d6 3816 return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
1da177e4
LT		 3817}
3818
3819
695e12f8 3820static __be32
b37ad28b 3821nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
1da177e4 3822{
d0a381dd 3823 struct xdr_stream *xdr = &resp->xdr;
bc749ca4 3824 __be32 *p;
1da177e4 3825
bac966d6
BF		 3826 p = xdr_reserve_space(xdr, 20);
3827 if (!p)
3828 return nfserr_resource;
3829 p = encode_cinfo(p, &link->li_cinfo);
3830 return 0;
1da177e4
LT		 3831}
3832
3833
695e12f8 3834static __be32
b37ad28b 3835nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
1da177e4 3836{
d0a381dd 3837 struct xdr_stream *xdr = &resp->xdr;
bc749ca4 3838 __be32 *p;
1da177e4 3839
d0a381dd
BF		 3840 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3841 if (nfserr)
bac966d6 3842 return nfserr;
75976de6 3843 p = xdr_reserve_space(xdr, 24);
d0a381dd
BF		 3844 if (!p)
3845 return nfserr_resource;
d05d5744 3846 p = encode_cinfo(p, &open->op_cinfo);
c373b0a4 3847 *p++ = cpu_to_be32(open->op_rflags);
1da177e4 3848
75976de6
KM		 3849 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3850 open->op_bmval[2]);
3851 if (nfserr)
bac966d6 3852 return nfserr;
75976de6
KM		 3853
3854 p = xdr_reserve_space(xdr, 4);
3855 if (!p)
3856 return nfserr_resource;
3857
3858 *p++ = cpu_to_be32(open->op_delegate_type);
1da177e4
LT		 3859 switch (open->op_delegate_type) {
3860 case NFS4_OPEN_DELEGATE_NONE:
3861 break;
3862 case NFS4_OPEN_DELEGATE_READ:
d0a381dd
BF		 3863 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3864 if (nfserr)
3865 return nfserr;
3866 p = xdr_reserve_space(xdr, 20);
3867 if (!p)
3868 return nfserr_resource;
c373b0a4 3869 *p++ = cpu_to_be32(open->op_recall);
1da177e4
LT		 3870
3871 /*
3872 * TODO: ACE's in delegations
3873 */
c373b0a4
BF		 3874 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3875 *p++ = cpu_to_be32(0);
3876 *p++ = cpu_to_be32(0);
3877 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
1da177e4
LT		 3878 break;
3879 case NFS4_OPEN_DELEGATE_WRITE:
d0a381dd
BF		 3880 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3881 if (nfserr)
3882 return nfserr;
3883 p = xdr_reserve_space(xdr, 32);
3884 if (!p)
3885 return nfserr_resource;
c373b0a4 3886 *p++ = cpu_to_be32(0);
1da177e4
LT		 3887
3888 /*
3889 * TODO: space_limit's in delegations
3890 */
c373b0a4
BF		 3891 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3892 *p++ = cpu_to_be32(~(u32)0);
3893 *p++ = cpu_to_be32(~(u32)0);
1da177e4
LT		 3894
3895 /*
3896 * TODO: ACE's in delegations
3897 */
c373b0a4
BF		 3898 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3899 *p++ = cpu_to_be32(0);
3900 *p++ = cpu_to_be32(0);
3901 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
1da177e4 3902 break;
d24433cd
BH		 3903 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3904 switch (open->op_why_no_deleg) {
3905 case WND4_CONTENTION:
3906 case WND4_RESOURCE:
d0a381dd
BF		 3907 p = xdr_reserve_space(xdr, 8);
3908 if (!p)
3909 return nfserr_resource;
c373b0a4
BF		 3910 *p++ = cpu_to_be32(open->op_why_no_deleg);
3911 /* deleg signaling not supported yet: */
3912 *p++ = cpu_to_be32(0);
d24433cd
BH		 3913 break;
3914 default:
d0a381dd
BF		 3915 p = xdr_reserve_space(xdr, 4);
3916 if (!p)
3917 return nfserr_resource;
c373b0a4 3918 *p++ = cpu_to_be32(open->op_why_no_deleg);
d24433cd 3919 }
d24433cd 3920 break;
1da177e4
LT		 3921 default:
3922 BUG();
3923 }
3924 /* XXX save filehandle here */
bac966d6 3925 return 0;
1da177e4
LT		 3926}
3927
695e12f8 3928static __be32
b37ad28b 3929nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
1da177e4 3930{
d0a381dd
BF		 3931 struct xdr_stream *xdr = &resp->xdr;
3932
bac966d6 3933 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
1da177e4
LT		 3934}
3935
695e12f8 3936static __be32
b37ad28b 3937nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
1da177e4 3938{
d0a381dd
BF		 3939 struct xdr_stream *xdr = &resp->xdr;
3940
bac966d6 3941 return nfsd4_encode_stateid(xdr, &od->od_stateid);
1da177e4
LT		 3942}
3943
dc97618d
BF		 3944static __be32 nfsd4_encode_splice_read(
3945 struct nfsd4_compoundres *resp,
3946 struct nfsd4_read *read,
3947 struct file *file, unsigned long maxcount)
1da177e4 3948{
ddd1ea56 3949 struct xdr_stream *xdr = &resp->xdr;
34a78b48 3950 struct xdr_buf *buf = xdr->buf;
76e5492b 3951 int status, space_left;
dc97618d 3952 u32 eof;
dc97618d 3953 __be32 nfserr;
fec25fa4 3954 __be32 *p = xdr->p - 2;
1da177e4 3955
d5d5c304
KM		 3956 /* Make sure there will be room for padding if needed */
3957 if (xdr->end - xdr->p < 1)
d0a381dd 3958 return nfserr_resource;
dc97618d 3959
87c5942e 3960 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
83a63072 3961 file, read->rd_offset, &maxcount, &eof);
87c5942e 3962 read->rd_length = maxcount;
76e5492b
CL		 3963 if (nfserr)
3964 goto out_err;
3965 status = svc_encode_result_payload(read->rd_rqstp,
3966 buf->head[0].iov_len, maxcount);
3967 if (status) {
3968 nfserr = nfserrno(status);
3969 goto out_err;
b0e35fda 3970 }
1da177e4 3971
fec25fa4
BF		 3972 *(p++) = htonl(eof);
3973 *(p++) = htonl(maxcount);
dc97618d 3974
34a78b48
BF		 3975 buf->page_len = maxcount;
3976 buf->len += maxcount;
15b23ef5
BF		 3977 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3978 / PAGE_SIZE;
dc97618d
BF		 3979
3980 /* Use rest of head for padding and remaining ops: */
34a78b48
BF		 3981 buf->tail[0].iov_base = xdr->p;
3982 buf->tail[0].iov_len = 0;
fec25fa4 3983 xdr->iov = buf->tail;
dc97618d 3984 if (maxcount&3) {
fec25fa4
BF		 3985 int pad = 4 - (maxcount&3);
3986
3987 *(xdr->p++) = 0;
3988
34a78b48 3989 buf->tail[0].iov_base += maxcount&3;
fec25fa4
BF		 3990 buf->tail[0].iov_len = pad;
3991 buf->len += pad;
b0e35fda 3992 }
2825a7f9 3993
dc97618d 3994 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
34a78b48
BF		 3995 buf->buflen - buf->len);
3996 buf->buflen = buf->len + space_left;
dc97618d
BF		 3997 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3998
3999 return 0;
76e5492b
CL		 4000
4001out_err:
4002 /*
4003 * nfsd_splice_actor may have already messed with the
4004 * page length; reset it so as not to confuse
4005 * xdr_truncate_encode in our caller.
4006 */
4007 buf->page_len = 0;
4008 return nfserr;
dc97618d
BF		 4009}
4010
4011static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
4012 struct nfsd4_read *read,
4013 struct file *file, unsigned long maxcount)
4014{
4015 struct xdr_stream *xdr = &resp->xdr;
4016 u32 eof;
dc97618d 4017 int starting_len = xdr->buf->len - 8;
dc97618d
BF		 4018 __be32 nfserr;
4019 __be32 tmp;
b0420980 4020 int pad;
1da177e4 4021
403217f3
AS		 4022 read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, maxcount);
4023 if (read->rd_vlen < 0)
4024 return nfserr_resource;
1da177e4 4025
87c5942e 4026 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
83a63072
TM		 4027 resp->rqstp->rq_vec, read->rd_vlen, &maxcount,
4028 &eof);
87c5942e 4029 read->rd_length = maxcount;
dc97618d 4030 if (nfserr)
1da177e4 4031 return nfserr;
03493bca 4032 if (svc_encode_result_payload(resp->rqstp, starting_len + 8, maxcount))
41205539 4033 return nfserr_io;
7dcf4ab9 4034 xdr_truncate_encode(xdr, starting_len + 8 + xdr_align_size(maxcount));
dc97618d 4035
dc97618d
BF		 4036 tmp = htonl(eof);
4037 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
4038 tmp = htonl(maxcount);
4039 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
4040
7dcf4ab9 4041 tmp = xdr_zero;
b0420980
BF		 4042 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
4043 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
7dcf4ab9 4044 &tmp, pad);
1da177e4 4045 return 0;
dc97618d
BF		 4046
4047}
4048
4049static __be32
4050nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
4051 struct nfsd4_read *read)
4052{
4053 unsigned long maxcount;
4054 struct xdr_stream *xdr = &resp->xdr;
5c4583b2 4055 struct file *file;
dc97618d 4056 int starting_len = xdr->buf->len;
dc97618d 4057 __be32 *p;
dc97618d 4058
5c4583b2
JL		 4059 if (nfserr)
4060 return nfserr;
4061 file = read->rd_nf->nf_file;
4062
dc97618d
BF		 4063 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
4064 if (!p) {
779fb0f3 4065 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
bac966d6 4066 return nfserr_resource;
dc97618d 4067 }
68e8bb03
CH		 4068 if (resp->xdr.buf->page_len &&
4069 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
b0420980 4070 WARN_ON_ONCE(1);
bac966d6 4071 return nfserr_resource;
dc97618d 4072 }
dc97618d
BF		 4073 xdr_commit_encode(xdr);
4074
4075 maxcount = svc_max_payload(resp->rqstp);
68e8bb03
CH		 4076 maxcount = min_t(unsigned long, maxcount,
4077 (xdr->buf->buflen - xdr->buf->len));
3c7aa15d 4078 maxcount = min_t(unsigned long, maxcount, read->rd_length);
dc97618d 4079
68e8bb03
CH		 4080 if (file->f_op->splice_read &&
4081 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
96bcad50 4082 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
dc97618d 4083 else
96bcad50 4084 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
dc97618d 4085
96bcad50 4086 if (nfserr)
dc97618d 4087 xdr_truncate_encode(xdr, starting_len);
96bcad50 4088
96bcad50 4089 return nfserr;
1da177e4
LT		 4090}
4091
b37ad28b
AV		 4092static __be32
4093nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
1da177e4
LT		 4094{
4095 int maxcount;
476a7b1f
BF		 4096 __be32 wire_count;
4097 int zero = 0;
ddd1ea56 4098 struct xdr_stream *xdr = &resp->xdr;
1fcea5b2 4099 int length_offset = xdr->buf->len;
76e5492b 4100 int status;
bc749ca4 4101 __be32 *p;
1da177e4 4102
2825a7f9
BF		 4103 p = xdr_reserve_space(xdr, 4);
4104 if (!p)
4105 return nfserr_resource;
1da177e4 4106 maxcount = PAGE_SIZE;
d0a381dd 4107
476a7b1f
BF		 4108 p = xdr_reserve_space(xdr, maxcount);
4109 if (!p)
4e21ac4b 4110 return nfserr_resource;
1da177e4 4111 /*
fd4a0edf
MS		 4112 * XXX: By default, vfs_readlink() will truncate symlinks if they
4113 * would overflow the buffer. Is this kosher in NFSv4? If not, one
4114 * easy fix is: if vfs_readlink() precisely fills the buffer, assume
4115 * that truncation occurred, and return NFS4ERR_RESOURCE.
1da177e4 4116 */
476a7b1f
BF		 4117 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
4118 (char *)p, &maxcount);
1da177e4 4119 if (nfserr == nfserr_isdir)
d3f627c8 4120 nfserr = nfserr_inval;
76e5492b
CL		 4121 if (nfserr)
4122 goto out_err;
4123 status = svc_encode_result_payload(readlink->rl_rqstp, length_offset,
4124 maxcount);
4125 if (status) {
4126 nfserr = nfserrno(status);
4127 goto out_err;
d3f627c8 4128 }
1da177e4 4129
476a7b1f
BF		 4130 wire_count = htonl(maxcount);
4131 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
69bbd9c7 4132 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
476a7b1f
BF		 4133 if (maxcount & 3)
4134 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
4135 &zero, 4 - (maxcount&3));
1da177e4 4136 return 0;
76e5492b
CL		 4137
4138out_err:
4139 xdr_truncate_encode(xdr, length_offset);
4140 return nfserr;
1da177e4
LT		 4141}
4142
b37ad28b
AV		 4143static __be32
4144nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
1da177e4
LT		 4145{
4146 int maxcount;
561f0ed4 4147 int bytes_left;
1da177e4 4148 loff_t offset;
561f0ed4 4149 __be64 wire_offset;
ddd1ea56 4150 struct xdr_stream *xdr = &resp->xdr;
1fcea5b2 4151 int starting_len = xdr->buf->len;
bc749ca4 4152 __be32 *p;
1da177e4 4153
d0a381dd
BF		 4154 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
4155 if (!p)
4156 return nfserr_resource;
1da177e4
LT		 4157
4158 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
c373b0a4
BF		 4159 *p++ = cpu_to_be32(0);
4160 *p++ = cpu_to_be32(0);
4aea24b2
BF		 4161 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
4162 - (char *)resp->xdr.buf->head[0].iov_base;
1da177e4
LT		 4163
4164 /*
561f0ed4
BF		 4165 * Number of bytes left for directory entries allowing for the
4166 * final 8 bytes of the readdir and a following failed op:
4167 */
4168 bytes_left = xdr->buf->buflen - xdr->buf->len
4169 - COMPOUND_ERR_SLACK_SPACE - 8;
4170 if (bytes_left < 0) {
4171 nfserr = nfserr_resource;
4172 goto err_no_verf;
4173 }
9c2ece6e
SM		 4174 maxcount = svc_max_payload(resp->rqstp);
4175 maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
561f0ed4
BF		 4176 /*
4177 * Note the rfc defines rd_maxcount as the size of the
4178 * READDIR4resok structure, which includes the verifier above
4179 * and the 8 bytes encoded at the end of this function:
1da177e4 4180 */
561f0ed4
BF		 4181 if (maxcount < 16) {
4182 nfserr = nfserr_toosmall;
1da177e4
LT		 4183 goto err_no_verf;
4184 }
561f0ed4 4185 maxcount = min_t(int, maxcount-16, bytes_left);
1da177e4 4186
aee37764
BF		 4187 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
4188 if (!readdir->rd_dircount)
9c2ece6e 4189 readdir->rd_dircount = svc_max_payload(resp->rqstp);
aee37764 4190
561f0ed4
BF		 4191 readdir->xdr = xdr;
4192 readdir->rd_maxcount = maxcount;
1da177e4 4193 readdir->common.err = 0;
561f0ed4 4194 readdir->cookie_offset = 0;
1da177e4
LT		 4195
4196 offset = readdir->rd_cookie;
4197 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
4198 &offset,
4199 &readdir->common, nfsd4_encode_dirent);
4200 if (nfserr == nfs_ok &&
4201 readdir->common.err == nfserr_toosmall &&
561f0ed4
BF		 4202 xdr->buf->len == starting_len + 8) {
4203 /* nothing encoded; which limit did we hit?: */
4204 if (maxcount - 16 < bytes_left)
4205 /* It was the fault of rd_maxcount: */
4206 nfserr = nfserr_toosmall;
4207 else
4208 /* We ran out of buffer space: */
4209 nfserr = nfserr_resource;
4210 }
1da177e4
LT		 4211 if (nfserr)
4212 goto err_no_verf;
4213
561f0ed4
BF		 4214 if (readdir->cookie_offset) {
4215 wire_offset = cpu_to_be64(offset);
4216 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
4217 &wire_offset, 8);
4218 }
1da177e4 4219
561f0ed4
BF		 4220 p = xdr_reserve_space(xdr, 8);
4221 if (!p) {
4222 WARN_ON_ONCE(1);
4223 goto err_no_verf;
4224 }
1da177e4
LT		 4225 *p++ = 0; /* no more entries */
4226 *p++ = htonl(readdir->common.err == nfserr_eof);
1da177e4
LT		 4227
4228 return 0;
4229err_no_verf:
1fcea5b2 4230 xdr_truncate_encode(xdr, starting_len);
1da177e4
LT		 4231 return nfserr;
4232}
4233
695e12f8 4234static __be32
b37ad28b 4235nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
1da177e4 4236{
d0a381dd 4237 struct xdr_stream *xdr = &resp->xdr;
bc749ca4 4238 __be32 *p;
1da177e4 4239
bac966d6
BF		 4240 p = xdr_reserve_space(xdr, 20);
4241 if (!p)
4242 return nfserr_resource;
4243 p = encode_cinfo(p, &remove->rm_cinfo);
4244 return 0;
1da177e4
LT		 4245}
4246
695e12f8 4247static __be32
b37ad28b 4248nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
1da177e4 4249{
d0a381dd 4250 struct xdr_stream *xdr = &resp->xdr;
bc749ca4 4251 __be32 *p;
1da177e4 4252
bac966d6
BF		 4253 p = xdr_reserve_space(xdr, 40);
4254 if (!p)
4255 return nfserr_resource;
4256 p = encode_cinfo(p, &rename->rn_sinfo);
4257 p = encode_cinfo(p, &rename->rn_tinfo);
4258 return 0;
1da177e4
LT		 4259}
4260
695e12f8 4261static __be32
bac966d6 4262nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
dcb488a3 4263{
676e4ebd 4264 u32 i, nflavs, supported;
4796f457
BF		 4265 struct exp_flavor_info *flavs;
4266 struct exp_flavor_info def_flavs[2];
676e4ebd
CL		 4267 __be32 *p, *flavorsp;
4268 static bool report = true;
dcb488a3 4269
4796f457
BF		 4270 if (exp->ex_nflavors) {
4271 flavs = exp->ex_flavors;
4272 nflavs = exp->ex_nflavors;
4273 } else { /* Handling of some defaults in absence of real secinfo: */
4274 flavs = def_flavs;
4275 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
4276 nflavs = 2;
4277 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
4278 flavs[1].pseudoflavor = RPC_AUTH_NULL;
4279 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
4280 nflavs = 1;
4281 flavs[0].pseudoflavor
4282 = svcauth_gss_flavor(exp->ex_client);
4283 } else {
4284 nflavs = 1;
4285 flavs[0].pseudoflavor
4286 = exp->ex_client->flavour->flavour;
4287 }
4288 }
4289
676e4ebd 4290 supported = 0;
d0a381dd
BF		 4291 p = xdr_reserve_space(xdr, 4);
4292 if (!p)
bac966d6 4293 return nfserr_resource;
676e4ebd 4294 flavorsp = p++; /* to be backfilled later */
676e4ebd 4295
4796f457 4296 for (i = 0; i < nflavs; i++) {
676e4ebd 4297 rpc_authflavor_t pf = flavs[i].pseudoflavor;
a77c806f 4298 struct rpcsec_gss_info info;
dcb488a3 4299
676e4ebd
CL		 4300 if (rpcauth_get_gssinfo(pf, &info) == 0) {
4301 supported++;
d0a381dd
BF		 4302 p = xdr_reserve_space(xdr, 4 + 4 +
4303 XDR_LEN(info.oid.len) + 4 + 4);
4304 if (!p)
bac966d6 4305 return nfserr_resource;
c373b0a4 4306 *p++ = cpu_to_be32(RPC_AUTH_GSS);
0c0c267b 4307 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
c373b0a4
BF		 4308 *p++ = cpu_to_be32(info.qop);
4309 *p++ = cpu_to_be32(info.service);
676e4ebd
CL		 4310 } else if (pf < RPC_AUTH_MAXFLAVOR) {
4311 supported++;
d0a381dd
BF		 4312 p = xdr_reserve_space(xdr, 4);
4313 if (!p)
bac966d6 4314 return nfserr_resource;
c373b0a4 4315 *p++ = cpu_to_be32(pf);
676e4ebd
CL		 4316 } else {
4317 if (report)
4318 pr_warn("NFS: SECINFO: security flavor %u "
4319 "is not supported\n", pf);
dcb488a3
AA		 4320 }
4321 }
a77c806f 4322
676e4ebd
CL		 4323 if (nflavs != supported)
4324 report = false;
4325 *flavorsp = htonl(supported);
bac966d6 4326 return 0;
dcb488a3
AA		 4327}
4328
22b6dee8
MJ		 4329static __be32
4330nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4331 struct nfsd4_secinfo *secinfo)
4332{
d0a381dd
BF		 4333 struct xdr_stream *xdr = &resp->xdr;
4334
bac966d6 4335 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
22b6dee8
MJ		 4336}
4337
4338static __be32
4339nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
4340 struct nfsd4_secinfo_no_name *secinfo)
4341{
d0a381dd
BF		 4342 struct xdr_stream *xdr = &resp->xdr;
4343
bac966d6 4344 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
22b6dee8
MJ		 4345}
4346
1da177e4
LT		 4347/*
4348 * The SETATTR encode routine is special -- it always encodes a bitmap,
4349 * regardless of the error status.
4350 */
695e12f8 4351static __be32
b37ad28b 4352nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
1da177e4 4353{
d0a381dd 4354 struct xdr_stream *xdr = &resp->xdr;
bc749ca4 4355 __be32 *p;
1da177e4 4356
d0a381dd
BF		 4357 p = xdr_reserve_space(xdr, 16);
4358 if (!p)
4359 return nfserr_resource;
1da177e4 4360 if (nfserr) {
c373b0a4
BF		 4361 *p++ = cpu_to_be32(3);
4362 *p++ = cpu_to_be32(0);
4363 *p++ = cpu_to_be32(0);
4364 *p++ = cpu_to_be32(0);
1da177e4
LT		 4365 }
4366 else {
c373b0a4
BF		 4367 *p++ = cpu_to_be32(3);
4368 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
4369 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
4370 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
1da177e4 4371 }
695e12f8 4372 return nfserr;
1da177e4
LT		 4373}
4374
695e12f8 4375static __be32
b37ad28b 4376nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
1da177e4 4377{
d0a381dd 4378 struct xdr_stream *xdr = &resp->xdr;
bc749ca4 4379 __be32 *p;
1da177e4
LT		 4380
4381 if (!nfserr) {
d0a381dd
BF		 4382 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
4383 if (!p)
4384 return nfserr_resource;
0c0c267b
BF		 4385 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
4386 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
4387 NFS4_VERIFIER_SIZE);
1da177e4
LT		 4388 }
4389 else if (nfserr == nfserr_clid_inuse) {
d0a381dd
BF		 4390 p = xdr_reserve_space(xdr, 8);
4391 if (!p)
4392 return nfserr_resource;
c373b0a4
BF		 4393 *p++ = cpu_to_be32(0);
4394 *p++ = cpu_to_be32(0);
1da177e4 4395 }
695e12f8 4396 return nfserr;
1da177e4
LT		 4397}
4398
695e12f8 4399static __be32
b37ad28b 4400nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
1da177e4 4401{
d0a381dd 4402 struct xdr_stream *xdr = &resp->xdr;
bc749ca4 4403 __be32 *p;
1da177e4 4404
bac966d6
BF		 4405 p = xdr_reserve_space(xdr, 16);
4406 if (!p)
4407 return nfserr_resource;
4408 *p++ = cpu_to_be32(write->wr_bytes_written);
4409 *p++ = cpu_to_be32(write->wr_how_written);
4410 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4411 NFS4_VERIFIER_SIZE);
4412 return 0;
1da177e4
LT		 4413}
4414
2db134eb 4415static __be32
57b7b43b 4416nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
2db134eb
AA		 4417 struct nfsd4_exchange_id *exid)
4418{
d0a381dd 4419 struct xdr_stream *xdr = &resp->xdr;
bc749ca4 4420 __be32 *p;
0733d213
AA		 4421 char *major_id;
4422 char *server_scope;
4423 int major_id_sz;
4424 int server_scope_sz;
4425 uint64_t minor_id = 0;
7627d7dc 4426 struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
0733d213 4427
7627d7dc
SM		 4428 major_id = nn->nfsd_name;
4429 major_id_sz = strlen(nn->nfsd_name);
4430 server_scope = nn->nfsd_name;
4431 server_scope_sz = strlen(nn->nfsd_name);
0733d213 4432
d0a381dd 4433 p = xdr_reserve_space(xdr,
0733d213
AA		 4434 8 /* eir_clientid */ +
4435 4 /* eir_sequenceid */ +
4436 4 /* eir_flags */ +
a8bb84bc 4437 4 /* spr_how */);
d0a381dd
BF		 4438 if (!p)
4439 return nfserr_resource;
0733d213 4440
0c0c267b 4441 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
c373b0a4
BF		 4442 *p++ = cpu_to_be32(exid->seqid);
4443 *p++ = cpu_to_be32(exid->flags);
0733d213 4444
c373b0a4 4445 *p++ = cpu_to_be32(exid->spa_how);
a8bb84bc 4446
57266a6e
BF		 4447 switch (exid->spa_how) {
4448 case SP4_NONE:
4449 break;
4450 case SP4_MACH_CRED:
4451 /* spo_must_enforce bitmap: */
bac966d6 4452 nfserr = nfsd4_encode_bitmap(xdr,
ed941643
AE		 4453 exid->spo_must_enforce[0],
4454 exid->spo_must_enforce[1],
4455 exid->spo_must_enforce[2]);
bac966d6
BF		 4456 if (nfserr)
4457 return nfserr;
ed941643 4458 /* spo_must_allow bitmap: */
bac966d6 4459 nfserr = nfsd4_encode_bitmap(xdr,
ed941643
AE		 4460 exid->spo_must_allow[0],
4461 exid->spo_must_allow[1],
4462 exid->spo_must_allow[2]);
bac966d6
BF		 4463 if (nfserr)
4464 return nfserr;
57266a6e
BF		 4465 break;
4466 default:
4467 WARN_ON_ONCE(1);
4468 }
0733d213 4469
d0a381dd 4470 p = xdr_reserve_space(xdr,
a8bb84bc
KM		 4471 8 /* so_minor_id */ +
4472 4 /* so_major_id.len */ +
4473 (XDR_QUADLEN(major_id_sz) * 4) +
4474 4 /* eir_server_scope.len */ +
4475 (XDR_QUADLEN(server_scope_sz) * 4) +
4476 4 /* eir_server_impl_id.count (0) */);
d0a381dd
BF		 4477 if (!p)
4478 return nfserr_resource;
a8bb84bc 4479
0733d213 4480 /* The server_owner struct */
b64c7f3b 4481 p = xdr_encode_hyper(p, minor_id); /* Minor id */
0733d213 4482 /* major id */
0c0c267b 4483 p = xdr_encode_opaque(p, major_id, major_id_sz);
0733d213
AA		 4484
4485 /* Server scope */
0c0c267b 4486 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
0733d213
AA		 4487
4488 /* Implementation id */
c373b0a4 4489 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
0733d213 4490 return 0;
2db134eb
AA		 4491}
4492
4493static __be32
57b7b43b 4494nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
2db134eb
AA		 4495 struct nfsd4_create_session *sess)
4496{
d0a381dd 4497 struct xdr_stream *xdr = &resp->xdr;
bc749ca4 4498 __be32 *p;
ec6b5d7b 4499
d0a381dd
BF		 4500 p = xdr_reserve_space(xdr, 24);
4501 if (!p)
4502 return nfserr_resource;
0c0c267b
BF		 4503 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4504 NFS4_MAX_SESSIONID_LEN);
c373b0a4
BF		 4505 *p++ = cpu_to_be32(sess->seqid);
4506 *p++ = cpu_to_be32(sess->flags);
ec6b5d7b 4507
d0a381dd
BF		 4508 p = xdr_reserve_space(xdr, 28);
4509 if (!p)
4510 return nfserr_resource;
c373b0a4
BF		 4511 *p++ = cpu_to_be32(0); /* headerpadsz */
4512 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4513 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4514 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4515 *p++ = cpu_to_be32(sess->fore_channel.maxops);
4516 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4517 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
ec6b5d7b
AA		 4518
4519 if (sess->fore_channel.nr_rdma_attrs) {
d0a381dd
BF		 4520 p = xdr_reserve_space(xdr, 4);
4521 if (!p)
4522 return nfserr_resource;
c373b0a4 4523 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
ec6b5d7b
AA		 4524 }
4525
d0a381dd
BF		 4526 p = xdr_reserve_space(xdr, 28);
4527 if (!p)
4528 return nfserr_resource;
c373b0a4
BF		 4529 *p++ = cpu_to_be32(0); /* headerpadsz */
4530 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4531 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4532 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4533 *p++ = cpu_to_be32(sess->back_channel.maxops);
4534 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4535 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
ec6b5d7b
AA		 4536
4537 if (sess->back_channel.nr_rdma_attrs) {
d0a381dd
BF		 4538 p = xdr_reserve_space(xdr, 4);
4539 if (!p)
4540 return nfserr_resource;
c373b0a4 4541 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
ec6b5d7b
AA		 4542 }
4543 return 0;
2db134eb
AA		 4544}
4545
c47d832b 4546static __be32
57b7b43b 4547nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
2db134eb
AA		 4548 struct nfsd4_sequence *seq)
4549{
d0a381dd 4550 struct xdr_stream *xdr = &resp->xdr;
bc749ca4 4551 __be32 *p;
b85d4c01 4552
d0a381dd
BF		 4553 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4554 if (!p)
4555 return nfserr_resource;
0c0c267b
BF		 4556 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4557 NFS4_MAX_SESSIONID_LEN);
c373b0a4
BF		 4558 *p++ = cpu_to_be32(seq->seqid);
4559 *p++ = cpu_to_be32(seq->slotid);
b7d7ca35 4560 /* Note slotid's are numbered from zero: */
c373b0a4
BF		 4561 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4562 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4563 *p++ = cpu_to_be32(seq->status_flags);
b85d4c01 4564
f5236013 4565 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
b85d4c01 4566 return 0;
2db134eb
AA		 4567}
4568
2355c596 4569static __be32
57b7b43b 4570nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
17456804
BS		 4571 struct nfsd4_test_stateid *test_stateid)
4572{
d0a381dd 4573 struct xdr_stream *xdr = &resp->xdr;
03cfb420 4574 struct nfsd4_test_stateid_id *stateid, *next;
17456804 4575 __be32 *p;
17456804 4576
d0a381dd
BF		 4577 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4578 if (!p)
4579 return nfserr_resource;
17456804 4580 *p++ = htonl(test_stateid->ts_num_ids);
17456804 4581
03cfb420 4582 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
02f5fde5 4583 *p++ = stateid->ts_id_status;
17456804 4584 }
17456804 4585
bac966d6 4586 return 0;
17456804
BS		 4587}
4588
9cf514cc
CH		 4589#ifdef CONFIG_NFSD_PNFS
4590static __be32
4591nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4592 struct nfsd4_getdeviceinfo *gdev)
4593{
4594 struct xdr_stream *xdr = &resp->xdr;
f961e3f2 4595 const struct nfsd4_layout_ops *ops;
9cf514cc
CH		 4596 u32 starting_len = xdr->buf->len, needed_len;
4597 __be32 *p;
4598
9cf514cc
CH		 4599 p = xdr_reserve_space(xdr, 4);
4600 if (!p)
bac966d6 4601 return nfserr_resource;
9cf514cc
CH		 4602
4603 *p++ = cpu_to_be32(gdev->gd_layout_type);
4604
4605 /* If maxcount is 0 then just update notifications */
4606 if (gdev->gd_maxcount != 0) {
f961e3f2 4607 ops = nfsd4_layout_ops[gdev->gd_layout_type];
9cf514cc
CH		 4608 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4609 if (nfserr) {
4610 /*
4611 * We don't bother to burden the layout drivers with
4612 * enforcing gd_maxcount, just tell the client to
4613 * come back with a bigger buffer if it's not enough.
4614 */
4615 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4616 goto toosmall;
bac966d6 4617 return nfserr;
9cf514cc
CH		 4618 }
4619 }
4620
9cf514cc
CH		 4621 if (gdev->gd_notify_types) {
4622 p = xdr_reserve_space(xdr, 4 + 4);
4623 if (!p)
bac966d6 4624 return nfserr_resource;
9cf514cc
CH		 4625 *p++ = cpu_to_be32(1); /* bitmap length */
4626 *p++ = cpu_to_be32(gdev->gd_notify_types);
4627 } else {
4628 p = xdr_reserve_space(xdr, 4);
4629 if (!p)
bac966d6 4630 return nfserr_resource;
9cf514cc
CH		 4631 *p++ = 0;
4632 }
4633
bac966d6 4634 return 0;
9cf514cc
CH		 4635toosmall:
4636 dprintk("%s: maxcount too small\n", __func__);
4637 needed_len = xdr->buf->len + 4 /* notifications */;
4638 xdr_truncate_encode(xdr, starting_len);
4639 p = xdr_reserve_space(xdr, 4);
bac966d6
BF		 4640 if (!p)
4641 return nfserr_resource;
4642 *p++ = cpu_to_be32(needed_len);
4643 return nfserr_toosmall;
9cf514cc
CH		 4644}
4645
4646static __be32
4647nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4648 struct nfsd4_layoutget *lgp)
4649{
4650 struct xdr_stream *xdr = &resp->xdr;
f961e3f2 4651 const struct nfsd4_layout_ops *ops;
9cf514cc
CH		 4652 __be32 *p;
4653
9cf514cc
CH		 4654 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4655 if (!p)
bac966d6 4656 return nfserr_resource;
9cf514cc
CH		 4657
4658 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4659 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4660 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4661 sizeof(stateid_opaque_t));
4662
4663 *p++ = cpu_to_be32(1); /* we always return a single layout */
4664 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4665 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4666 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4667 *p++ = cpu_to_be32(lgp->lg_layout_type);
4668
f961e3f2 4669 ops = nfsd4_layout_ops[lgp->lg_layout_type];
bac966d6 4670 return ops->encode_layoutget(xdr, lgp);
9cf514cc
CH		 4671}
4672
4673static __be32
4674nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4675 struct nfsd4_layoutcommit *lcp)
4676{
4677 struct xdr_stream *xdr = &resp->xdr;
4678 __be32 *p;
4679
9cf514cc
CH		 4680 p = xdr_reserve_space(xdr, 4);
4681 if (!p)
4682 return nfserr_resource;
4683 *p++ = cpu_to_be32(lcp->lc_size_chg);
4684 if (lcp->lc_size_chg) {
4685 p = xdr_reserve_space(xdr, 8);
4686 if (!p)
4687 return nfserr_resource;
4688 p = xdr_encode_hyper(p, lcp->lc_newsize);
4689 }
4690
bac966d6 4691 return 0;
9cf514cc
CH		 4692}
4693
4694static __be32
4695nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4696 struct nfsd4_layoutreturn *lrp)
4697{
4698 struct xdr_stream *xdr = &resp->xdr;
4699 __be32 *p;
4700
9cf514cc
CH		 4701 p = xdr_reserve_space(xdr, 4);
4702 if (!p)
4703 return nfserr_resource;
4704 *p++ = cpu_to_be32(lrp->lrs_present);
4705 if (lrp->lrs_present)
376675da 4706 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
bac966d6 4707 return 0;
9cf514cc
CH		 4708}
4709#endif /* CONFIG_NFSD_PNFS */
4710
29ae7f9d 4711static __be32
e0639dc5
OK		 4712nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
4713 struct nfsd42_write_res *write, bool sync)
29ae7f9d
AS		 4714{
4715 __be32 *p;
e0639dc5
OK		 4716 p = xdr_reserve_space(&resp->xdr, 4);
4717 if (!p)
4718 return nfserr_resource;
29ae7f9d 4719
e0639dc5
OK		 4720 if (sync)
4721 *p++ = cpu_to_be32(0);
4722 else {
4723 __be32 nfserr;
4724 *p++ = cpu_to_be32(1);
4725 nfserr = nfsd4_encode_stateid(&resp->xdr, &write->cb_stateid);
4726 if (nfserr)
4727 return nfserr;
4728 }
4729 p = xdr_reserve_space(&resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
29ae7f9d
AS		 4730 if (!p)
4731 return nfserr_resource;
4732
29ae7f9d
AS		 4733 p = xdr_encode_hyper(p, write->wr_bytes_written);
4734 *p++ = cpu_to_be32(write->wr_stable_how);
4735 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4736 NFS4_VERIFIER_SIZE);
4737 return nfs_ok;
4738}
4739
51911868
OK		 4740static __be32
4741nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns)
4742{
4743 struct xdr_stream *xdr = &resp->xdr;
4744 struct nfs42_netaddr *addr;
4745 __be32 *p;
4746
4747 p = xdr_reserve_space(xdr, 4);
4748 *p++ = cpu_to_be32(ns->nl4_type);
4749
4750 switch (ns->nl4_type) {
4751 case NL4_NETADDR:
4752 addr = &ns->u.nl4_addr;
4753
4754 /* netid_len, netid, uaddr_len, uaddr (port included
4755 * in RPCBIND_MAXUADDRLEN)
4756 */
4757 p = xdr_reserve_space(xdr,
4758 4 /* netid len */ +
4759 (XDR_QUADLEN(addr->netid_len) * 4) +
4760 4 /* uaddr len */ +
4761 (XDR_QUADLEN(addr->addr_len) * 4));
4762 if (!p)
4763 return nfserr_resource;
4764
4765 *p++ = cpu_to_be32(addr->netid_len);
4766 p = xdr_encode_opaque_fixed(p, addr->netid,
4767 addr->netid_len);
4768 *p++ = cpu_to_be32(addr->addr_len);
4769 p = xdr_encode_opaque_fixed(p, addr->addr,
4770 addr->addr_len);
4771 break;
4772 default:
4773 WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR);
4774 return nfserr_inval;
4775 }
4776
4777 return 0;
4778}
4779
29ae7f9d
AS		 4780static __be32
4781nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4782 struct nfsd4_copy *copy)
4783{
4784 __be32 *p;
4785
e0639dc5 4786 nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
e8febea7 4787 !!copy->cp_synchronous);
bac966d6
BF		 4788 if (nfserr)
4789 return nfserr;
29ae7f9d 4790
bac966d6 4791 p = xdr_reserve_space(&resp->xdr, 4 + 4);
edcc8452 4792 *p++ = xdr_one; /* cr_consecutive */
bac966d6
BF		 4793 *p++ = cpu_to_be32(copy->cp_synchronous);
4794 return 0;
29ae7f9d
AS		 4795}
4796
6308bc98
OK		 4797static __be32
4798nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
4799 struct nfsd4_offload_status *os)
4800{
4801 struct xdr_stream *xdr = &resp->xdr;
4802 __be32 *p;
4803
4804 p = xdr_reserve_space(xdr, 8 + 4);
4805 if (!p)
4806 return nfserr_resource;
4807 p = xdr_encode_hyper(p, os->count);
4808 *p++ = cpu_to_be32(0);
528b8493
AS		 4809 return nfserr;
4810}
4811
4812static __be32
4813nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
4814 struct nfsd4_read *read,
9f0b5792
AS		 4815 unsigned long *maxcount, u32 *eof,
4816 loff_t *pos)
528b8493
AS		 4817{
4818 struct xdr_stream *xdr = &resp->xdr;
4819 struct file *file = read->rd_nf->nf_file;
4820 int starting_len = xdr->buf->len;
9f0b5792 4821 loff_t hole_pos;
528b8493
AS		 4822 __be32 nfserr;
4823 __be32 *p, tmp;
4824 __be64 tmp64;
4825
9f0b5792 4826 hole_pos = pos ? *pos : vfs_llseek(file, read->rd_offset, SEEK_HOLE);
2db27992 4827 if (hole_pos > read->rd_offset)
278765ea
AS		 4828 *maxcount = min_t(unsigned long, *maxcount, hole_pos - read->rd_offset);
4829 *maxcount = min_t(unsigned long, *maxcount, (xdr->buf->buflen - xdr->buf->len));
528b8493
AS		 4830
4831 /* Content type, offset, byte count */
4832 p = xdr_reserve_space(xdr, 4 + 8 + 4);
4833 if (!p)
4834 return nfserr_resource;
4835
278765ea 4836 read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, *maxcount);
528b8493
AS		 4837 if (read->rd_vlen < 0)
4838 return nfserr_resource;
4839
4840 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
278765ea 4841 resp->rqstp->rq_vec, read->rd_vlen, maxcount, eof);
528b8493
AS		 4842 if (nfserr)
4843 return nfserr;
4844
4845 tmp = htonl(NFS4_CONTENT_DATA);
4846 write_bytes_to_xdr_buf(xdr->buf, starting_len, &tmp, 4);
4847 tmp64 = cpu_to_be64(read->rd_offset);
4848 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp64, 8);
278765ea 4849 tmp = htonl(*maxcount);
528b8493
AS		 4850 write_bytes_to_xdr_buf(xdr->buf, starting_len + 12, &tmp, 4);
4851 return nfs_ok;
4852}
4853
2db27992
AS		 4854static __be32
4855nfsd4_encode_read_plus_hole(struct nfsd4_compoundres *resp,
4856 struct nfsd4_read *read,
278765ea 4857 unsigned long *maxcount, u32 *eof)
2db27992
AS		 4858{
4859 struct file *file = read->rd_nf->nf_file;
278765ea 4860 loff_t data_pos = vfs_llseek(file, read->rd_offset, SEEK_DATA);
9f0b5792 4861 loff_t f_size = i_size_read(file_inode(file));
278765ea 4862 unsigned long count;
2db27992
AS		 4863 __be32 *p;
4864
278765ea 4865 if (data_pos == -ENXIO)
9f0b5792
AS		 4866 data_pos = f_size;
4867 else if (data_pos <= read->rd_offset || (data_pos < f_size && data_pos % PAGE_SIZE))
4868 return nfsd4_encode_read_plus_data(resp, read, maxcount, eof, &f_size);
278765ea
AS		 4869 count = data_pos - read->rd_offset;
4870
2db27992
AS		 4871 /* Content type, offset, byte count */
4872 p = xdr_reserve_space(&resp->xdr, 4 + 8 + 8);
4873 if (!p)
4874 return nfserr_resource;
4875
4876 *p++ = htonl(NFS4_CONTENT_HOLE);
4877 p = xdr_encode_hyper(p, read->rd_offset);
278765ea 4878 p = xdr_encode_hyper(p, count);
2db27992 4879
9f0b5792 4880 *eof = (read->rd_offset + count) >= f_size;
278765ea 4881 *maxcount = min_t(unsigned long, count, *maxcount);
2db27992
AS		 4882 return nfs_ok;
4883}
4884
528b8493
AS		 4885static __be32
4886nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
4887 struct nfsd4_read *read)
4888{
278765ea 4889 unsigned long maxcount, count;
528b8493
AS		 4890 struct xdr_stream *xdr = &resp->xdr;
4891 struct file *file;
4892 int starting_len = xdr->buf->len;
9f0b5792 4893 int last_segment = xdr->buf->len;
528b8493
AS		 4894 int segments = 0;
4895 __be32 *p, tmp;
9f0b5792 4896 bool is_data;
2db27992 4897 loff_t pos;
528b8493
AS		 4898 u32 eof;
4899
4900 if (nfserr)
4901 return nfserr;
4902 file = read->rd_nf->nf_file;
4903
4904 /* eof flag, segment count */
4905 p = xdr_reserve_space(xdr, 4 + 4);
4906 if (!p)
4907 return nfserr_resource;
4908 xdr_commit_encode(xdr);
4909
4910 maxcount = svc_max_payload(resp->rqstp);
4911 maxcount = min_t(unsigned long, maxcount,
4912 (xdr->buf->buflen - xdr->buf->len));
4913 maxcount = min_t(unsigned long, maxcount, read->rd_length);
278765ea 4914 count = maxcount;
528b8493
AS		 4915
4916 eof = read->rd_offset >= i_size_read(file_inode(file));
2db27992
AS		 4917 if (eof)
4918 goto out;
4919
9f0b5792
AS		 4920 pos = vfs_llseek(file, read->rd_offset, SEEK_HOLE);
4921 is_data = pos > read->rd_offset;
2db27992 4922
9f0b5792 4923 while (count > 0 && !eof) {
278765ea 4924 maxcount = count;
9f0b5792
AS		 4925 if (is_data)
4926 nfserr = nfsd4_encode_read_plus_data(resp, read, &maxcount, &eof,
4927 segments == 0 ? &pos : NULL);
4928 else
4929 nfserr = nfsd4_encode_read_plus_hole(resp, read, &maxcount, &eof);
278765ea
AS		 4930 if (nfserr)
4931 goto out;
4932 count -= maxcount;
4933 read->rd_offset += maxcount;
9f0b5792
AS		 4934 is_data = !is_data;
4935 last_segment = xdr->buf->len;
528b8493
AS		 4936 segments++;
4937 }
4938
2db27992 4939out:
278765ea 4940 if (nfserr && segments == 0)
528b8493
AS		 4941 xdr_truncate_encode(xdr, starting_len);
4942 else {
4943 tmp = htonl(eof);
4944 write_bytes_to_xdr_buf(xdr->buf, starting_len, &tmp, 4);
4945 tmp = htonl(segments);
4946 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
9f0b5792
AS		 4947 if (nfserr) {
4948 xdr_truncate_encode(xdr, last_segment);
4949 nfserr = nfs_ok;
4950 }
528b8493 4951 }
6308bc98
OK		 4952
4953 return nfserr;
4954}
4955
51911868
OK		 4956static __be32
4957nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
4958 struct nfsd4_copy_notify *cn)
4959{
4960 struct xdr_stream *xdr = &resp->xdr;
4961 __be32 *p;
4962
4963 if (nfserr)
4964 return nfserr;
4965
4966 /* 8 sec, 4 nsec */
4967 p = xdr_reserve_space(xdr, 12);
4968 if (!p)
4969 return nfserr_resource;
4970
4971 /* cnr_lease_time */
4972 p = xdr_encode_hyper(p, cn->cpn_sec);
4973 *p++ = cpu_to_be32(cn->cpn_nsec);
4974
4975 /* cnr_stateid */
4976 nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid);
4977 if (nfserr)
4978 return nfserr;
4979
4980 /* cnr_src.nl_nsvr */
4981 p = xdr_reserve_space(xdr, 4);
4982 if (!p)
4983 return nfserr_resource;
4984
4985 *p++ = cpu_to_be32(1);
4986
4987 return nfsd42_encode_nl4_server(resp, &cn->cpn_src);
4988}
4989
24bab491
AS		 4990static __be32
4991nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4992 struct nfsd4_seek *seek)
4993{
4994 __be32 *p;
4995
24bab491
AS		 4996 p = xdr_reserve_space(&resp->xdr, 4 + 8);
4997 *p++ = cpu_to_be32(seek->seek_eof);
4998 p = xdr_encode_hyper(p, seek->seek_pos);
4999
bac966d6 5000 return 0;
24bab491
AS		 5001}
5002
695e12f8
BH		 5003static __be32
5004nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
5005{
5006 return nfserr;
5007}
5008
23e50fe3
FL		 5009/*
5010 * Encode kmalloc-ed buffer in to XDR stream.
5011 */
b9a49237 5012static __be32
23e50fe3
FL		 5013nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
5014{
5015 u32 cplen;
5016 __be32 *p;
5017
5018 cplen = min_t(unsigned long, buflen,
5019 ((void *)xdr->end - (void *)xdr->p));
5020 p = xdr_reserve_space(xdr, cplen);
5021 if (!p)
5022 return nfserr_resource;
5023
5024 memcpy(p, buf, cplen);
5025 buf += cplen;
5026 buflen -= cplen;
5027
5028 while (buflen) {
5029 cplen = min_t(u32, buflen, PAGE_SIZE);
5030 p = xdr_reserve_space(xdr, cplen);
5031 if (!p)
5032 return nfserr_resource;
5033
5034 memcpy(p, buf, cplen);
5035
5036 if (cplen < PAGE_SIZE) {
5037 /*
5038 * We're done, with a length that wasn't page
5039 * aligned, so possibly not word aligned. Pad
5040 * any trailing bytes with 0.
5041 */
5042 xdr_encode_opaque_fixed(p, NULL, cplen);
5043 break;
5044 }
5045
5046 buflen -= PAGE_SIZE;
5047 buf += PAGE_SIZE;
5048 }
5049
5050 return 0;
5051}
5052
5053static __be32
5054nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5055 struct nfsd4_getxattr *getxattr)
5056{
5057 struct xdr_stream *xdr = &resp->xdr;
5058 __be32 *p, err;
5059
5060 p = xdr_reserve_space(xdr, 4);
5061 if (!p)
5062 return nfserr_resource;
5063
5064 *p = cpu_to_be32(getxattr->getxa_len);
5065
5066 if (getxattr->getxa_len == 0)
5067 return 0;
5068
5069 err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf,
5070 getxattr->getxa_len);
5071
5072 kvfree(getxattr->getxa_buf);
5073
5074 return err;
5075}
5076
5077static __be32
5078nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5079 struct nfsd4_setxattr *setxattr)
5080{
5081 struct xdr_stream *xdr = &resp->xdr;
5082 __be32 *p;
5083
5084 p = xdr_reserve_space(xdr, 20);
5085 if (!p)
5086 return nfserr_resource;
5087
5088 encode_cinfo(p, &setxattr->setxa_cinfo);
5089
5090 return 0;
5091}
5092
5093/*
5094 * See if there are cookie values that can be rejected outright.
5095 */
5096static __be32
5097nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
5098 u32 *offsetp)
5099{
5100 u64 cookie = listxattrs->lsxa_cookie;
5101
5102 /*
5103 * If the cookie is larger than the maximum number we can fit
5104 * in either the buffer we just got back from vfs_listxattr, or,
5105 * XDR-encoded, in the return buffer, it's invalid.
5106 */
5107 if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
5108 return nfserr_badcookie;
5109
5110 if (cookie > (listxattrs->lsxa_maxcount /
5111 (XDR_QUADLEN(XATTR_USER_PREFIX_LEN + 2) + 4)))
5112 return nfserr_badcookie;
5113
5114 *offsetp = (u32)cookie;
5115 return 0;
5116}
5117
5118static __be32
5119nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
5120 struct nfsd4_listxattrs *listxattrs)
5121{
5122 struct xdr_stream *xdr = &resp->xdr;
5123 u32 cookie_offset, count_offset, eof;
5124 u32 left, xdrleft, slen, count;
5125 u32 xdrlen, offset;
5126 u64 cookie;
5127 char *sp;
b9a49237 5128 __be32 status, tmp;
23e50fe3
FL		 5129 __be32 *p;
5130 u32 nuser;
5131
5132 eof = 1;
5133
5134 status = nfsd4_listxattr_validate_cookie(listxattrs, &offset);
5135 if (status)
5136 goto out;
5137
5138 /*
5139 * Reserve space for the cookie and the name array count. Record
5140 * the offsets to save them later.
5141 */
5142 cookie_offset = xdr->buf->len;
5143 count_offset = cookie_offset + 8;
5144 p = xdr_reserve_space(xdr, 12);
5145 if (!p) {
5146 status = nfserr_resource;
5147 goto out;
5148 }
5149
5150 count = 0;
5151 left = listxattrs->lsxa_len;
5152 sp = listxattrs->lsxa_buf;
5153 nuser = 0;
5154
5155 xdrleft = listxattrs->lsxa_maxcount;
5156
5157 while (left > 0 && xdrleft > 0) {
5158 slen = strlen(sp);
5159
5160 /*
4cce11fa 5161 * Check if this is a "user." attribute, skip it if not.
23e50fe3
FL		 5162 */
5163 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
5164 goto contloop;
5165
5166 slen -= XATTR_USER_PREFIX_LEN;
5167 xdrlen = 4 + ((slen + 3) & ~3);
5168 if (xdrlen > xdrleft) {
5169 if (count == 0) {
5170 /*
5171 * Can't even fit the first attribute name.
5172 */
5173 status = nfserr_toosmall;
5174 goto out;
5175 }
5176 eof = 0;
5177 goto wreof;
5178 }
5179
5180 left -= XATTR_USER_PREFIX_LEN;
5181 sp += XATTR_USER_PREFIX_LEN;
5182 if (nuser++ < offset)
5183 goto contloop;
5184
5185
5186 p = xdr_reserve_space(xdr, xdrlen);
5187 if (!p) {
5188 status = nfserr_resource;
5189 goto out;
5190 }
5191
e2a1840e 5192 xdr_encode_opaque(p, sp, slen);
23e50fe3
FL		 5193
5194 xdrleft -= xdrlen;
5195 count++;
5196contloop:
5197 sp += slen + 1;
5198 left -= slen + 1;
5199 }
5200
5201 /*
5202 * If there were user attributes to copy, but we didn't copy
5203 * any, the offset was too large (e.g. the cookie was invalid).
5204 */
5205 if (nuser > 0 && count == 0) {
5206 status = nfserr_badcookie;
5207 goto out;
5208 }
5209
5210wreof:
5211 p = xdr_reserve_space(xdr, 4);
5212 if (!p) {
5213 status = nfserr_resource;
5214 goto out;
5215 }
5216 *p = cpu_to_be32(eof);
5217
5218 cookie = offset + count;
5219
5220 write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &cookie, 8);
b9a49237
CL		 5221 tmp = cpu_to_be32(count);
5222 write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4);
23e50fe3
FL		 5223out:
5224 if (listxattrs->lsxa_len)
5225 kvfree(listxattrs->lsxa_buf);
5226 return status;
5227}
5228
5229static __be32
5230nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5231 struct nfsd4_removexattr *removexattr)
5232{
5233 struct xdr_stream *xdr = &resp->xdr;
5234 __be32 *p;
5235
5236 p = xdr_reserve_space(xdr, 20);
5237 if (!p)
5238 return nfserr_resource;
5239
5240 p = encode_cinfo(p, &removexattr->rmxa_cinfo);
5241 return 0;
5242}
5243
695e12f8
BH		 5244typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
5245
2db134eb
AA		 5246/*
5247 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
5248 * since we don't need to filter out obsolete ops as this is
5249 * done in the decoding phase.
5250 */
c1df609d 5251static const nfsd4_enc nfsd4_enc_ops[] = {
ad1060c8
BF		 5252 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
5253 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
5254 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
5255 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
5256 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
5257 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
5258 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
5259 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
5260 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
5261 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
5262 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
5263 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
5264 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
5265 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
5266 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
5267 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
84f09f46 5268 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
ad1060c8
BF		 5269 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
5270 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
5271 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
5272 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
5273 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
5274 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
5275 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
5276 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
5277 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
5278 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
5279 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
5280 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
5281 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
5282 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
5283 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
5284 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
5285 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
5286 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
5287 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
5288 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
2db134eb
AA		 5289
5290 /* NFSv4.1 operations */
5291 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
1d1bc8f2 5292 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
2db134eb
AA		 5293 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
5294 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
43212cc7
KM		 5295 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
5296 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
2db134eb 5297 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
9cf514cc
CH		 5298#ifdef CONFIG_NFSD_PNFS
5299 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
5300 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
5301 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit,
5302 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget,
5303 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn,
5304#else
2db134eb
AA		 5305 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
5306 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
5307 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
5308 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
5309 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
9cf514cc 5310#endif
22b6dee8 5311 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
2db134eb
AA		 5312 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
5313 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
17456804 5314 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
2db134eb
AA		 5315 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
5316 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
5317 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
87a15a80
AS		 5318
5319 /* NFSv4.2 operations */
5320 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
29ae7f9d 5321 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy,
51911868 5322 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_copy_notify,
87a15a80
AS		 5323 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
5324 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
5325 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
5326 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
5327 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
6308bc98 5328 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_offload_status,
528b8493 5329 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_read_plus,
24bab491 5330 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
87a15a80 5331 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
ffa0160a 5332 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop,
23e50fe3
FL		 5333
5334 /* RFC 8276 extended atributes operations */
5335 [OP_GETXATTR] = (nfsd4_enc)nfsd4_encode_getxattr,
5336 [OP_SETXATTR] = (nfsd4_enc)nfsd4_encode_setxattr,
5337 [OP_LISTXATTRS] = (nfsd4_enc)nfsd4_encode_listxattrs,
5338 [OP_REMOVEXATTR] = (nfsd4_enc)nfsd4_encode_removexattr,
695e12f8
BH		 5339};
5340
496c262c 5341/*
a8095f7e
BF		 5342 * Calculate whether we still have space to encode repsize bytes.
5343 * There are two considerations:
5344 * - For NFS versions >=4.1, the size of the reply must stay within
5345 * session limits
5346 * - For all NFS versions, we must stay within limited preallocated
5347 * buffer space.
496c262c 5348 *
a8095f7e
BF		 5349 * This is called before the operation is processed, so can only provide
5350 * an upper estimate. For some nonidempotent operations (such as
5351 * getattr), it's not necessarily a problem if that estimate is wrong,
5352 * as we can fail it after processing without significant side effects.
496c262c 5353 */
a8095f7e 5354__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
496c262c 5355{
67492c99 5356 struct xdr_buf *buf = &resp->rqstp->rq_res;
47ee5298 5357 struct nfsd4_slot *slot = resp->cstate.slot;
496c262c 5358
47ee5298
BF		 5359 if (buf->len + respsize <= buf->buflen)
5360 return nfs_ok;
5361 if (!nfsd4_has_session(&resp->cstate))
ea8d7720 5362 return nfserr_resource;
47ee5298
BF		 5363 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
5364 WARN_ON_ONCE(1);
5365 return nfserr_rep_too_big_to_cache;
ea8d7720 5366 }
47ee5298 5367 return nfserr_rep_too_big;
496c262c
AA		 5368}
5369
1da177e4
LT		 5370void
5371nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
5372{
082d4bd7 5373 struct xdr_stream *xdr = &resp->xdr;
9411b1d4 5374 struct nfs4_stateowner *so = resp->cstate.replay_owner;
5f4ab945 5375 struct svc_rqst *rqstp = resp->rqstp;
34b1744c 5376 const struct nfsd4_operation *opdesc = op->opdesc;
082d4bd7 5377 int post_err_offset;
07d1f802 5378 nfsd4_enc encoder;
bc749ca4 5379 __be32 *p;
1da177e4 5380
d0a381dd
BF		 5381 p = xdr_reserve_space(xdr, 8);
5382 if (!p) {
5383 WARN_ON_ONCE(1);
5384 return;
5385 }
c373b0a4 5386 *p++ = cpu_to_be32(op->opnum);
082d4bd7 5387 post_err_offset = xdr->buf->len;
1da177e4 5388
695e12f8
BH		 5389 if (op->opnum == OP_ILLEGAL)
5390 goto status;
b7571e4c
BF		 5391 if (op->status && opdesc &&
5392 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
5393 goto status;
695e12f8
BH		 5394 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
5395 !nfsd4_enc_ops[op->opnum]);
07d1f802
BF		 5396 encoder = nfsd4_enc_ops[op->opnum];
5397 op->status = encoder(resp, op->status, &op->u);
08281341
CL		 5398 if (op->status)
5399 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status);
34b1744c
BF		 5400 if (opdesc && opdesc->op_release)
5401 opdesc->op_release(&op->u);
2825a7f9
BF		 5402 xdr_commit_encode(xdr);
5403
067e1ace 5404 /* nfsd4_check_resp_size guarantees enough room for error status */
5f4ab945
BF		 5405 if (!op->status) {
5406 int space_needed = 0;
5407 if (!nfsd4_last_compound_op(rqstp))
5408 space_needed = COMPOUND_ERR_SLACK_SPACE;
5409 op->status = nfsd4_check_resp_size(resp, space_needed);
5410 }
c8f13d97
BF		 5411 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
5412 struct nfsd4_slot *slot = resp->cstate.slot;
5413
5414 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
5415 op->status = nfserr_rep_too_big_to_cache;
5416 else
5417 op->status = nfserr_rep_too_big;
5418 }
07d1f802
BF		 5419 if (op->status == nfserr_resource ||
5420 op->status == nfserr_rep_too_big ||
5421 op->status == nfserr_rep_too_big_to_cache) {
5422 /*
5423 * The operation may have already been encoded or
5424 * partially encoded. No op returns anything additional
5425 * in the case of one of these three errors, so we can
5426 * just truncate back to after the status. But it's a
5427 * bug if we had to do this on a non-idempotent op:
5428 */
5429 warn_on_nonidempotent_op(op);
082d4bd7 5430 xdr_truncate_encode(xdr, post_err_offset);
07d1f802 5431 }
9411b1d4 5432 if (so) {
082d4bd7
BF		 5433 int len = xdr->buf->len - post_err_offset;
5434
9411b1d4 5435 so->so_replay.rp_status = op->status;
082d4bd7
BF		 5436 so->so_replay.rp_buflen = len;
5437 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
5438 so->so_replay.rp_buf, len);
9411b1d4 5439 }
695e12f8 5440status:
082d4bd7
BF		 5441 /* Note that op->status is already in network byte order: */
5442 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
1da177e4
LT		 5443}
5444
5445/*
5446 * Encode the reply stored in the stateowner reply cache
5447 *
5448 * XDR note: do not encode rp->rp_buflen: the buffer contains the
5449 * previously sent already encoded operation.
1da177e4
LT		 5450 */
5451void
d0a381dd 5452nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
1da177e4 5453{
bc749ca4 5454 __be32 *p;
1da177e4
LT		 5455 struct nfs4_replay *rp = op->replay;
5456
d0a381dd
BF		 5457 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
5458 if (!p) {
5459 WARN_ON_ONCE(1);
5460 return;
5461 }
c373b0a4 5462 *p++ = cpu_to_be32(op->opnum);
1da177e4 5463 *p++ = rp->rp_status; /* already xdr'ed */
1da177e4 5464
0c0c267b 5465 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
1da177e4
LT		 5466}
5467
8537488b 5468void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
1da177e4 5469{
3e98abff
BF		 5470 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5471
1da177e4
LT		 5472 if (args->ops != args->iops) {
5473 kfree(args->ops);
5474 args->ops = args->iops;
5475 }
1da177e4 5476 while (args->to_free) {
d5e23383 5477 struct svcxdr_tmpbuf *tb = args->to_free;
1da177e4 5478 args->to_free = tb->next;
1da177e4
LT		 5479 kfree(tb);
5480 }
5481}
5482
5483int
026fec7e 5484nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
1da177e4 5485{
026fec7e
CH		 5486 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5487
c1346a12 5488 /* svcxdr_tmp_alloc */
1da177e4
LT		 5489 args->tmpp = NULL;
5490 args->to_free = NULL;
c1346a12
CL		 5491
5492 args->xdr = &rqstp->rq_arg_stream;
1da177e4
LT		 5493 args->ops = args->iops;
5494 args->rqstp = rqstp;
5495
3e98abff 5496 return !nfsd4_decode_compound(args);
1da177e4
LT		 5497}
5498
5499int
63f8de37 5500nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
1da177e4 5501{
63f8de37 5502 struct nfsd4_compoundres *resp = rqstp->rq_resp;
6ac90391
BF		 5503 struct xdr_buf *buf = resp->xdr.buf;
5504
5505 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
5506 buf->tail[0].iov_len);
dd97fdde 5507
cc028a10
CL		 5508 *p = resp->cstate.status;
5509
2825a7f9
BF		 5510 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
5511
1da177e4
LT		 5512 p = resp->tagp;
5513 *p++ = htonl(resp->taglen);
5514 memcpy(p, resp->tag, resp->taglen);
5515 p += XDR_QUADLEN(resp->taglen);
5516 *p++ = htonl(resp->opcnt);
5517
b607664e 5518 nfsd4_sequence_done(resp);
1da177e4
LT		 5519 return 1;
5520}
5521
5522/*
5523 * Local variables:
5524 * c-basic-offset: 8
5525 * End:
5526 */
Linux 6.x block layer and io_uring tree(s)