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CommitLineData
1da177e4 1/*
1da177e4
LT
2 * XDR support for nfsd/protocol version 3.
3 *
4 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
5 *
6 * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
7 */
8
1da177e4 9#include <linux/namei.h>
b9c0ef85 10#include <linux/sunrpc/svc_xprt.h>
9a74af21 11#include "xdr3.h"
2e8138a2 12#include "auth.h"
b9c0ef85 13#include "netns.h"
3dadecce 14#include "vfs.h"
1da177e4
LT
15
16#define NFSDDBG_FACILITY NFSDDBG_XDR
17
1da177e4
LT
18
19/*
20 * Mapping of S_IF* types to NFS file types
21 */
22static u32 nfs3_ftypes[] = {
23 NF3NON, NF3FIFO, NF3CHR, NF3BAD,
24 NF3DIR, NF3BAD, NF3BLK, NF3BAD,
25 NF3REG, NF3BAD, NF3LNK, NF3BAD,
26 NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
27};
28
29/*
30 * XDR functions for basic NFS types
31 */
3ee6f61c 32static __be32 *
91f07168 33encode_time3(__be32 *p, struct timespec *time)
1da177e4
LT
34{
35 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
36 return p;
37}
38
3ee6f61c 39static __be32 *
91f07168 40decode_time3(__be32 *p, struct timespec *time)
1da177e4
LT
41{
42 time->tv_sec = ntohl(*p++);
43 time->tv_nsec = ntohl(*p++);
44 return p;
45}
46
3ee6f61c 47static __be32 *
91f07168 48decode_fh(__be32 *p, struct svc_fh *fhp)
1da177e4
LT
49{
50 unsigned int size;
51 fh_init(fhp, NFS3_FHSIZE);
52 size = ntohl(*p++);
53 if (size > NFS3_FHSIZE)
54 return NULL;
55
56 memcpy(&fhp->fh_handle.fh_base, p, size);
57 fhp->fh_handle.fh_size = size;
58 return p + XDR_QUADLEN(size);
59}
60
a257cdd0 61/* Helper function for NFSv3 ACL code */
91f07168 62__be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
a257cdd0
AG
63{
64 return decode_fh(p, fhp);
65}
66
3ee6f61c 67static __be32 *
91f07168 68encode_fh(__be32 *p, struct svc_fh *fhp)
1da177e4
LT
69{
70 unsigned int size = fhp->fh_handle.fh_size;
71 *p++ = htonl(size);
72 if (size) p[XDR_QUADLEN(size)-1]=0;
73 memcpy(p, &fhp->fh_handle.fh_base, size);
74 return p + XDR_QUADLEN(size);
75}
76
77/*
78 * Decode a file name and make sure that the path contains
79 * no slashes or null bytes.
80 */
3ee6f61c 81static __be32 *
ee1a95b3 82decode_filename(__be32 *p, char **namp, unsigned int *lenp)
1da177e4
LT
83{
84 char *name;
ee1a95b3 85 unsigned int i;
1da177e4
LT
86
87 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
88 for (i = 0, name = *namp; i < *lenp; i++, name++) {
89 if (*name == '\0' || *name == '/')
90 return NULL;
91 }
92 }
93
94 return p;
95}
96
3ee6f61c 97static __be32 *
91f07168 98decode_sattr3(__be32 *p, struct iattr *iap)
1da177e4
LT
99{
100 u32 tmp;
101
102 iap->ia_valid = 0;
103
104 if (*p++) {
105 iap->ia_valid |= ATTR_MODE;
106 iap->ia_mode = ntohl(*p++);
107 }
108 if (*p++) {
458878a7
EB
109 iap->ia_uid = make_kuid(&init_user_ns, ntohl(*p++));
110 if (uid_valid(iap->ia_uid))
111 iap->ia_valid |= ATTR_UID;
1da177e4
LT
112 }
113 if (*p++) {
458878a7
EB
114 iap->ia_gid = make_kgid(&init_user_ns, ntohl(*p++));
115 if (gid_valid(iap->ia_gid))
116 iap->ia_valid |= ATTR_GID;
1da177e4
LT
117 }
118 if (*p++) {
119 u64 newsize;
120
121 iap->ia_valid |= ATTR_SIZE;
122 p = xdr_decode_hyper(p, &newsize);
3c7aa15d 123 iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
1da177e4
LT
124 }
125 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
126 iap->ia_valid |= ATTR_ATIME;
127 } else if (tmp == 2) { /* set to client time */
128 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
129 iap->ia_atime.tv_sec = ntohl(*p++);
130 iap->ia_atime.tv_nsec = ntohl(*p++);
131 }
132 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
133 iap->ia_valid |= ATTR_MTIME;
134 } else if (tmp == 2) { /* set to client time */
135 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
136 iap->ia_mtime.tv_sec = ntohl(*p++);
137 iap->ia_mtime.tv_nsec = ntohl(*p++);
138 }
139 return p;
140}
141
af6a4e28
N
142static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
143{
144 u64 f;
145 switch(fsid_source(fhp)) {
146 default:
147 case FSIDSOURCE_DEV:
148 p = xdr_encode_hyper(p, (u64)huge_encode_dev
2b0143b5 149 (d_inode(fhp->fh_dentry)->i_sb->s_dev));
af6a4e28
N
150 break;
151 case FSIDSOURCE_FSID:
152 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
153 break;
154 case FSIDSOURCE_UUID:
155 f = ((u64*)fhp->fh_export->ex_uuid)[0];
156 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
157 p = xdr_encode_hyper(p, f);
158 break;
159 }
160 return p;
161}
162
3ee6f61c 163static __be32 *
91f07168 164encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
a334de28 165 struct kstat *stat)
1da177e4 166{
a334de28 167 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
6e14b46b 168 *p++ = htonl((u32) (stat->mode & S_IALLUGO));
a334de28 169 *p++ = htonl((u32) stat->nlink);
458878a7
EB
170 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
171 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
a334de28 172 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
1da177e4
LT
173 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
174 } else {
a334de28 175 p = xdr_encode_hyper(p, (u64) stat->size);
1da177e4 176 }
a334de28
DS
177 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
178 *p++ = htonl((u32) MAJOR(stat->rdev));
179 *p++ = htonl((u32) MINOR(stat->rdev));
af6a4e28 180 p = encode_fsid(p, fhp);
40ee5dc6 181 p = xdr_encode_hyper(p, stat->ino);
a334de28 182 p = encode_time3(p, &stat->atime);
40ee5dc6 183 p = encode_time3(p, &stat->mtime);
a334de28 184 p = encode_time3(p, &stat->ctime);
1da177e4
LT
185
186 return p;
187}
188
3ee6f61c 189static __be32 *
91f07168 190encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
1da177e4 191{
1da177e4
LT
192 /* Attributes to follow */
193 *p++ = xdr_one;
40ee5dc6 194 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
1da177e4
LT
195}
196
197/*
198 * Encode post-operation attributes.
199 * The inode may be NULL if the call failed because of a stale file
200 * handle. In this case, no attributes are returned.
201 */
91f07168
AV
202static __be32 *
203encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
1da177e4
LT
204{
205 struct dentry *dentry = fhp->fh_dentry;
2b0143b5 206 if (dentry && d_really_is_positive(dentry)) {
3dadecce 207 __be32 err;
a334de28
DS
208 struct kstat stat;
209
3dadecce 210 err = fh_getattr(fhp, &stat);
a334de28
DS
211 if (!err) {
212 *p++ = xdr_one; /* attributes follow */
2b0143b5 213 lease_get_mtime(d_inode(dentry), &stat.mtime);
a334de28
DS
214 return encode_fattr3(rqstp, p, fhp, &stat);
215 }
1da177e4
LT
216 }
217 *p++ = xdr_zero;
218 return p;
219}
220
a257cdd0 221/* Helper for NFSv3 ACLs */
91f07168
AV
222__be32 *
223nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
a257cdd0
AG
224{
225 return encode_post_op_attr(rqstp, p, fhp);
226}
227
1da177e4
LT
228/*
229 * Enocde weak cache consistency data
230 */
91f07168
AV
231static __be32 *
232encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
1da177e4
LT
233{
234 struct dentry *dentry = fhp->fh_dentry;
235
2b0143b5 236 if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
1da177e4
LT
237 if (fhp->fh_pre_saved) {
238 *p++ = xdr_one;
239 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
240 p = encode_time3(p, &fhp->fh_pre_mtime);
241 p = encode_time3(p, &fhp->fh_pre_ctime);
242 } else {
243 *p++ = xdr_zero;
244 }
245 return encode_saved_post_attr(rqstp, p, fhp);
246 }
247 /* no pre- or post-attrs */
248 *p++ = xdr_zero;
249 return encode_post_op_attr(rqstp, p, fhp);
250}
251
40ee5dc6
PS
252/*
253 * Fill in the post_op attr for the wcc data
254 */
255void fill_post_wcc(struct svc_fh *fhp)
256{
3dadecce 257 __be32 err;
40ee5dc6
PS
258
259 if (fhp->fh_post_saved)
260 printk("nfsd: inode locked twice during operation.\n");
261
3dadecce 262 err = fh_getattr(fhp, &fhp->fh_post_attr);
2b0143b5 263 fhp->fh_post_change = d_inode(fhp->fh_dentry)->i_version;
c1ac3ffc 264 if (err) {
40ee5dc6 265 fhp->fh_post_saved = 0;
c1ac3ffc 266 /* Grab the ctime anyway - set_change_info might use it */
2b0143b5 267 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
c1ac3ffc 268 } else
40ee5dc6
PS
269 fhp->fh_post_saved = 1;
270}
1da177e4
LT
271
272/*
273 * XDR decode functions
274 */
275int
91f07168 276nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
1da177e4 277{
d40aa337
BT
278 p = decode_fh(p, &args->fh);
279 if (!p)
1da177e4
LT
280 return 0;
281 return xdr_argsize_check(rqstp, p);
282}
283
284int
91f07168 285nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
286 struct nfsd3_sattrargs *args)
287{
d40aa337
BT
288 p = decode_fh(p, &args->fh);
289 if (!p)
1da177e4 290 return 0;
072f62ed 291 p = decode_sattr3(p, &args->attrs);
1da177e4
LT
292
293 if ((args->check_guard = ntohl(*p++)) != 0) {
294 struct timespec time;
295 p = decode_time3(p, &time);
296 args->guardtime = time.tv_sec;
297 }
298
299 return xdr_argsize_check(rqstp, p);
300}
301
302int
91f07168 303nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
304 struct nfsd3_diropargs *args)
305{
306 if (!(p = decode_fh(p, &args->fh))
307 || !(p = decode_filename(p, &args->name, &args->len)))
308 return 0;
309
310 return xdr_argsize_check(rqstp, p);
311}
312
313int
91f07168 314nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
315 struct nfsd3_accessargs *args)
316{
d40aa337
BT
317 p = decode_fh(p, &args->fh);
318 if (!p)
1da177e4
LT
319 return 0;
320 args->access = ntohl(*p++);
321
322 return xdr_argsize_check(rqstp, p);
323}
324
325int
91f07168 326nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
327 struct nfsd3_readargs *args)
328{
329 unsigned int len;
afc59400 330 int v;
7adae489 331 u32 max_blocksize = svc_max_payload(rqstp);
1da177e4 332
d40aa337
BT
333 p = decode_fh(p, &args->fh);
334 if (!p)
1da177e4 335 return 0;
072f62ed 336 p = xdr_decode_hyper(p, &args->offset);
1da177e4 337
3c7aa15d
KM
338 args->count = ntohl(*p++);
339 len = min(args->count, max_blocksize);
1da177e4
LT
340
341 /* set up the kvec */
342 v=0;
343 while (len > 0) {
afc59400
BF
344 struct page *p = *(rqstp->rq_next_page++);
345
346 rqstp->rq_vec[v].iov_base = page_address(p);
3c7aa15d 347 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
3cc03b16 348 len -= rqstp->rq_vec[v].iov_len;
1da177e4
LT
349 v++;
350 }
351 args->vlen = v;
352 return xdr_argsize_check(rqstp, p);
353}
354
355int
91f07168 356nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
357 struct nfsd3_writeargs *args)
358{
f34b9568 359 unsigned int len, v, hdr, dlen;
7adae489 360 u32 max_blocksize = svc_max_payload(rqstp);
1da177e4 361
d40aa337
BT
362 p = decode_fh(p, &args->fh);
363 if (!p)
1da177e4 364 return 0;
072f62ed 365 p = xdr_decode_hyper(p, &args->offset);
1da177e4
LT
366
367 args->count = ntohl(*p++);
368 args->stable = ntohl(*p++);
369 len = args->len = ntohl(*p++);
f34b9568
PS
370 /*
371 * The count must equal the amount of data passed.
372 */
373 if (args->count != args->len)
374 return 0;
1da177e4 375
f34b9568
PS
376 /*
377 * Check to make sure that we got the right number of
378 * bytes.
f34b9568 379 */
1da177e4 380 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
072f62ed
N
381 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
382 - hdr;
f34b9568
PS
383 /*
384 * Round the length of the data which was specified up to
385 * the next multiple of XDR units and then compare that
386 * against the length which was actually received.
ba67a39e
N
387 * Note that when RPCSEC/GSS (for example) is used, the
388 * data buffer can be padded so dlen might be larger
389 * than required. It must never be smaller.
f34b9568 390 */
ba67a39e 391 if (dlen < XDR_QUADLEN(len)*4)
1da177e4
LT
392 return 0;
393
f34b9568
PS
394 if (args->count > max_blocksize) {
395 args->count = max_blocksize;
396 len = args->len = max_blocksize;
397 }
3cc03b16
N
398 rqstp->rq_vec[0].iov_base = (void*)p;
399 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
f34b9568 400 v = 0;
3cc03b16
N
401 while (len > rqstp->rq_vec[v].iov_len) {
402 len -= rqstp->rq_vec[v].iov_len;
1da177e4 403 v++;
3cc03b16
N
404 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
405 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1da177e4 406 }
3cc03b16 407 rqstp->rq_vec[v].iov_len = len;
f34b9568
PS
408 args->vlen = v + 1;
409 return 1;
1da177e4
LT
410}
411
412int
91f07168 413nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
414 struct nfsd3_createargs *args)
415{
416 if (!(p = decode_fh(p, &args->fh))
417 || !(p = decode_filename(p, &args->name, &args->len)))
418 return 0;
419
420 switch (args->createmode = ntohl(*p++)) {
421 case NFS3_CREATE_UNCHECKED:
422 case NFS3_CREATE_GUARDED:
072f62ed 423 p = decode_sattr3(p, &args->attrs);
1da177e4
LT
424 break;
425 case NFS3_CREATE_EXCLUSIVE:
426 args->verf = p;
427 p += 2;
428 break;
429 default:
430 return 0;
431 }
432
433 return xdr_argsize_check(rqstp, p);
434}
435int
91f07168 436nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
437 struct nfsd3_createargs *args)
438{
072f62ed
N
439 if (!(p = decode_fh(p, &args->fh)) ||
440 !(p = decode_filename(p, &args->name, &args->len)))
1da177e4 441 return 0;
072f62ed 442 p = decode_sattr3(p, &args->attrs);
1da177e4
LT
443
444 return xdr_argsize_check(rqstp, p);
445}
446
447int
91f07168 448nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
449 struct nfsd3_symlinkargs *args)
450{
a628f667 451 unsigned int len, avail;
1da177e4
LT
452 char *old, *new;
453 struct kvec *vec;
454
072f62ed
N
455 if (!(p = decode_fh(p, &args->ffh)) ||
456 !(p = decode_filename(p, &args->fname, &args->flen))
1da177e4
LT
457 )
458 return 0;
072f62ed
N
459 p = decode_sattr3(p, &args->attrs);
460
1da177e4
LT
461 /* now decode the pathname, which might be larger than the first page.
462 * As we have to check for nul's anyway, we copy it into a new page
463 * This page appears in the rq_res.pages list, but as pages_len is always
464 * 0, it won't get in the way
465 */
1da177e4
LT
466 len = ntohl(*p++);
467 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
468 return 0;
afc59400 469 args->tname = new = page_address(*(rqstp->rq_next_page++));
1da177e4
LT
470 args->tlen = len;
471 /* first copy and check from the first page */
472 old = (char*)p;
473 vec = &rqstp->rq_arg.head[0];
474 avail = vec->iov_len - (old - (char*)vec->iov_base);
475 while (len && avail && *old) {
476 *new++ = *old++;
477 len--;
478 avail--;
479 }
480 /* now copy next page if there is one */
481 if (len && !avail && rqstp->rq_arg.page_len) {
3c7aa15d 482 avail = min_t(unsigned int, rqstp->rq_arg.page_len, PAGE_SIZE);
1da177e4
LT
483 old = page_address(rqstp->rq_arg.pages[0]);
484 }
485 while (len && avail && *old) {
486 *new++ = *old++;
487 len--;
488 avail--;
489 }
490 *new = '\0';
491 if (len)
492 return 0;
493
494 return 1;
495}
496
497int
91f07168 498nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
499 struct nfsd3_mknodargs *args)
500{
501 if (!(p = decode_fh(p, &args->fh))
502 || !(p = decode_filename(p, &args->name, &args->len)))
503 return 0;
504
505 args->ftype = ntohl(*p++);
506
507 if (args->ftype == NF3BLK || args->ftype == NF3CHR
072f62ed
N
508 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
509 p = decode_sattr3(p, &args->attrs);
1da177e4
LT
510
511 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
512 args->major = ntohl(*p++);
513 args->minor = ntohl(*p++);
514 }
515
516 return xdr_argsize_check(rqstp, p);
517}
518
519int
91f07168 520nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
521 struct nfsd3_renameargs *args)
522{
523 if (!(p = decode_fh(p, &args->ffh))
524 || !(p = decode_filename(p, &args->fname, &args->flen))
525 || !(p = decode_fh(p, &args->tfh))
526 || !(p = decode_filename(p, &args->tname, &args->tlen)))
527 return 0;
528
529 return xdr_argsize_check(rqstp, p);
530}
531
532int
91f07168 533nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
534 struct nfsd3_readlinkargs *args)
535{
d40aa337
BT
536 p = decode_fh(p, &args->fh);
537 if (!p)
1da177e4 538 return 0;
afc59400 539 args->buffer = page_address(*(rqstp->rq_next_page++));
1da177e4
LT
540
541 return xdr_argsize_check(rqstp, p);
542}
543
544int
91f07168 545nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
546 struct nfsd3_linkargs *args)
547{
548 if (!(p = decode_fh(p, &args->ffh))
549 || !(p = decode_fh(p, &args->tfh))
550 || !(p = decode_filename(p, &args->tname, &args->tlen)))
551 return 0;
552
553 return xdr_argsize_check(rqstp, p);
554}
555
556int
91f07168 557nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
558 struct nfsd3_readdirargs *args)
559{
d40aa337
BT
560 p = decode_fh(p, &args->fh);
561 if (!p)
1da177e4
LT
562 return 0;
563 p = xdr_decode_hyper(p, &args->cookie);
564 args->verf = p; p += 2;
565 args->dircount = ~0;
566 args->count = ntohl(*p++);
3c7aa15d 567 args->count = min_t(u32, args->count, PAGE_SIZE);
afc59400 568 args->buffer = page_address(*(rqstp->rq_next_page++));
1da177e4
LT
569
570 return xdr_argsize_check(rqstp, p);
571}
572
573int
91f07168 574nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
575 struct nfsd3_readdirargs *args)
576{
afc59400 577 int len;
7adae489 578 u32 max_blocksize = svc_max_payload(rqstp);
1da177e4 579
d40aa337
BT
580 p = decode_fh(p, &args->fh);
581 if (!p)
1da177e4
LT
582 return 0;
583 p = xdr_decode_hyper(p, &args->cookie);
584 args->verf = p; p += 2;
585 args->dircount = ntohl(*p++);
586 args->count = ntohl(*p++);
587
3c7aa15d 588 len = args->count = min(args->count, max_blocksize);
1da177e4 589 while (len > 0) {
afc59400 590 struct page *p = *(rqstp->rq_next_page++);
1da177e4 591 if (!args->buffer)
afc59400 592 args->buffer = page_address(p);
1da177e4
LT
593 len -= PAGE_SIZE;
594 }
595
596 return xdr_argsize_check(rqstp, p);
597}
598
599int
91f07168 600nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
601 struct nfsd3_commitargs *args)
602{
d40aa337
BT
603 p = decode_fh(p, &args->fh);
604 if (!p)
1da177e4
LT
605 return 0;
606 p = xdr_decode_hyper(p, &args->offset);
607 args->count = ntohl(*p++);
608
609 return xdr_argsize_check(rqstp, p);
610}
611
612/*
613 * XDR encode functions
614 */
615/*
616 * There must be an encoding function for void results so svc_process
617 * will work properly.
618 */
619int
91f07168 620nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
1da177e4
LT
621{
622 return xdr_ressize_check(rqstp, p);
623}
624
625/* GETATTR */
626int
91f07168 627nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
628 struct nfsd3_attrstat *resp)
629{
40ee5dc6 630 if (resp->status == 0) {
2b0143b5 631 lease_get_mtime(d_inode(resp->fh.fh_dentry),
40ee5dc6 632 &resp->stat.mtime);
a334de28 633 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
40ee5dc6 634 }
1da177e4
LT
635 return xdr_ressize_check(rqstp, p);
636}
637
638/* SETATTR, REMOVE, RMDIR */
639int
91f07168 640nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
641 struct nfsd3_attrstat *resp)
642{
643 p = encode_wcc_data(rqstp, p, &resp->fh);
644 return xdr_ressize_check(rqstp, p);
645}
646
647/* LOOKUP */
648int
91f07168 649nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
650 struct nfsd3_diropres *resp)
651{
652 if (resp->status == 0) {
653 p = encode_fh(p, &resp->fh);
654 p = encode_post_op_attr(rqstp, p, &resp->fh);
655 }
656 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
657 return xdr_ressize_check(rqstp, p);
658}
659
660/* ACCESS */
661int
91f07168 662nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
663 struct nfsd3_accessres *resp)
664{
665 p = encode_post_op_attr(rqstp, p, &resp->fh);
666 if (resp->status == 0)
667 *p++ = htonl(resp->access);
668 return xdr_ressize_check(rqstp, p);
669}
670
671/* READLINK */
672int
91f07168 673nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
674 struct nfsd3_readlinkres *resp)
675{
676 p = encode_post_op_attr(rqstp, p, &resp->fh);
677 if (resp->status == 0) {
678 *p++ = htonl(resp->len);
679 xdr_ressize_check(rqstp, p);
680 rqstp->rq_res.page_len = resp->len;
681 if (resp->len & 3) {
682 /* need to pad the tail */
1da177e4
LT
683 rqstp->rq_res.tail[0].iov_base = p;
684 *p = 0;
685 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
686 }
687 return 1;
688 } else
689 return xdr_ressize_check(rqstp, p);
690}
691
692/* READ */
693int
91f07168 694nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
695 struct nfsd3_readres *resp)
696{
697 p = encode_post_op_attr(rqstp, p, &resp->fh);
698 if (resp->status == 0) {
699 *p++ = htonl(resp->count);
700 *p++ = htonl(resp->eof);
701 *p++ = htonl(resp->count); /* xdr opaque count */
702 xdr_ressize_check(rqstp, p);
25985edc 703 /* now update rqstp->rq_res to reflect data as well */
1da177e4
LT
704 rqstp->rq_res.page_len = resp->count;
705 if (resp->count & 3) {
706 /* need to pad the tail */
1da177e4
LT
707 rqstp->rq_res.tail[0].iov_base = p;
708 *p = 0;
709 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
710 }
711 return 1;
712 } else
713 return xdr_ressize_check(rqstp, p);
714}
715
716/* WRITE */
717int
91f07168 718nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
719 struct nfsd3_writeres *resp)
720{
b9c0ef85
SK
721 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
722
1da177e4
LT
723 p = encode_wcc_data(rqstp, p, &resp->fh);
724 if (resp->status == 0) {
725 *p++ = htonl(resp->count);
726 *p++ = htonl(resp->committed);
b9c0ef85
SK
727 *p++ = htonl(nn->nfssvc_boot.tv_sec);
728 *p++ = htonl(nn->nfssvc_boot.tv_usec);
1da177e4
LT
729 }
730 return xdr_ressize_check(rqstp, p);
731}
732
733/* CREATE, MKDIR, SYMLINK, MKNOD */
734int
91f07168 735nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
736 struct nfsd3_diropres *resp)
737{
738 if (resp->status == 0) {
739 *p++ = xdr_one;
740 p = encode_fh(p, &resp->fh);
741 p = encode_post_op_attr(rqstp, p, &resp->fh);
742 }
743 p = encode_wcc_data(rqstp, p, &resp->dirfh);
744 return xdr_ressize_check(rqstp, p);
745}
746
747/* RENAME */
748int
91f07168 749nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
750 struct nfsd3_renameres *resp)
751{
752 p = encode_wcc_data(rqstp, p, &resp->ffh);
753 p = encode_wcc_data(rqstp, p, &resp->tfh);
754 return xdr_ressize_check(rqstp, p);
755}
756
757/* LINK */
758int
91f07168 759nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
760 struct nfsd3_linkres *resp)
761{
762 p = encode_post_op_attr(rqstp, p, &resp->fh);
763 p = encode_wcc_data(rqstp, p, &resp->tfh);
764 return xdr_ressize_check(rqstp, p);
765}
766
767/* READDIR */
768int
91f07168 769nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
770 struct nfsd3_readdirres *resp)
771{
772 p = encode_post_op_attr(rqstp, p, &resp->fh);
773
774 if (resp->status == 0) {
775 /* stupid readdir cookie */
776 memcpy(p, resp->verf, 8); p += 2;
777 xdr_ressize_check(rqstp, p);
778 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
779 return 1; /*No room for trailer */
780 rqstp->rq_res.page_len = (resp->count) << 2;
781
782 /* add the 'tail' to the end of the 'head' page - page 0. */
1da177e4
LT
783 rqstp->rq_res.tail[0].iov_base = p;
784 *p++ = 0; /* no more entries */
785 *p++ = htonl(resp->common.err == nfserr_eof);
786 rqstp->rq_res.tail[0].iov_len = 2<<2;
787 return 1;
788 } else
789 return xdr_ressize_check(rqstp, p);
790}
791
3ee6f61c 792static __be32 *
91f07168 793encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
40ee5dc6 794 int namlen, u64 ino)
1da177e4
LT
795{
796 *p++ = xdr_one; /* mark entry present */
797 p = xdr_encode_hyper(p, ino); /* file id */
798 p = xdr_encode_array(p, name, namlen);/* name length & name */
799
800 cd->offset = p; /* remember pointer */
801 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
802
803 return p;
804}
805
efe39651 806static __be32
1da177e4 807compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
43b0e7ea 808 const char *name, int namlen, u64 ino)
1da177e4
LT
809{
810 struct svc_export *exp;
811 struct dentry *dparent, *dchild;
efe39651 812 __be32 rv = nfserr_noent;
1da177e4
LT
813
814 dparent = cd->fh.fh_dentry;
815 exp = cd->fh.fh_export;
816
1da177e4
LT
817 if (isdotent(name, namlen)) {
818 if (namlen == 2) {
819 dchild = dget_parent(dparent);
efe39651
AV
820 /* filesystem root - cannot return filehandle for ".." */
821 if (dchild == dparent)
822 goto out;
1da177e4
LT
823 } else
824 dchild = dget(dparent);
825 } else
826 dchild = lookup_one_len(name, dparent, namlen);
827 if (IS_ERR(dchild))
efe39651 828 return rv;
8177e6d6
BF
829 if (d_mountpoint(dchild))
830 goto out;
2b0143b5 831 if (d_really_is_negative(dchild))
8177e6d6 832 goto out;
43b0e7ea
N
833 if (dchild->d_inode->i_ino != ino)
834 goto out;
efe39651 835 rv = fh_compose(fhp, exp, dchild, &cd->fh);
8177e6d6 836out:
1da177e4
LT
837 dput(dchild);
838 return rv;
839}
840
43b0e7ea 841static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
8177e6d6 842{
068c34c0 843 struct svc_fh *fh = &cd->scratch;
efe39651 844 __be32 err;
8177e6d6 845
068c34c0 846 fh_init(fh, NFS3_FHSIZE);
43b0e7ea 847 err = compose_entry_fh(cd, fh, name, namlen, ino);
8177e6d6
BF
848 if (err) {
849 *p++ = 0;
850 *p++ = 0;
aed100fa 851 goto out;
8177e6d6 852 }
068c34c0 853 p = encode_post_op_attr(cd->rqstp, p, fh);
8177e6d6 854 *p++ = xdr_one; /* yes, a file handle follows */
068c34c0 855 p = encode_fh(p, fh);
aed100fa 856out:
068c34c0 857 fh_put(fh);
8177e6d6
BF
858 return p;
859}
860
1da177e4
LT
861/*
862 * Encode a directory entry. This one works for both normal readdir
863 * and readdirplus.
864 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
865 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
866 *
867 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
868 * file handle.
869 */
870
871#define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
872#define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
873static int
598b9a56 874encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
40ee5dc6 875 loff_t offset, u64 ino, unsigned int d_type, int plus)
1da177e4
LT
876{
877 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
878 common);
91f07168 879 __be32 *p = cd->buffer;
1da177e4 880 caddr_t curr_page_addr = NULL;
afc59400 881 struct page ** page;
1da177e4
LT
882 int slen; /* string (name) length */
883 int elen; /* estimated entry length in words */
884 int num_entry_words = 0; /* actual number of words */
885
886 if (cd->offset) {
887 u64 offset64 = offset;
888
889 if (unlikely(cd->offset1)) {
890 /* we ended up with offset on a page boundary */
891 *cd->offset = htonl(offset64 >> 32);
892 *cd->offset1 = htonl(offset64 & 0xffffffff);
893 cd->offset1 = NULL;
894 } else {
598b9a56 895 xdr_encode_hyper(cd->offset, offset64);
1da177e4
LT
896 }
897 }
898
899 /*
900 dprintk("encode_entry(%.*s @%ld%s)\n",
901 namlen, name, (long) offset, plus? " plus" : "");
902 */
903
904 /* truncate filename if too long */
3c7aa15d 905 namlen = min(namlen, NFS3_MAXNAMLEN);
1da177e4
LT
906
907 slen = XDR_QUADLEN(namlen);
908 elen = slen + NFS3_ENTRY_BAGGAGE
909 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
910
911 if (cd->buflen < elen) {
912 cd->common.err = nfserr_toosmall;
913 return -EINVAL;
914 }
915
916 /* determine which page in rq_respages[] we are currently filling */
afc59400
BF
917 for (page = cd->rqstp->rq_respages + 1;
918 page < cd->rqstp->rq_next_page; page++) {
919 curr_page_addr = page_address(*page);
1da177e4
LT
920
921 if (((caddr_t)cd->buffer >= curr_page_addr) &&
922 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
923 break;
924 }
925
926 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
927 /* encode entry in current page */
928
929 p = encode_entry_baggage(cd, p, name, namlen, ino);
930
8177e6d6 931 if (plus)
43b0e7ea 932 p = encode_entryplus_baggage(cd, p, name, namlen, ino);
1da177e4 933 num_entry_words = p - cd->buffer;
afc59400 934 } else if (*(page+1) != NULL) {
1da177e4
LT
935 /* temporarily encode entry into next page, then move back to
936 * current and next page in rq_respages[] */
91f07168 937 __be32 *p1, *tmp;
1da177e4
LT
938 int len1, len2;
939
940 /* grab next page for temporary storage of entry */
afc59400 941 p1 = tmp = page_address(*(page+1));
1da177e4
LT
942
943 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
944
8177e6d6 945 if (plus)
43b0e7ea 946 p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
1da177e4
LT
947
948 /* determine entry word length and lengths to go in pages */
949 num_entry_words = p1 - tmp;
950 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
951 if ((num_entry_words << 2) < len1) {
952 /* the actual number of words in the entry is less
953 * than elen and can still fit in the current page
954 */
955 memmove(p, tmp, num_entry_words << 2);
956 p += num_entry_words;
957
958 /* update offset */
959 cd->offset = cd->buffer + (cd->offset - tmp);
960 } else {
961 unsigned int offset_r = (cd->offset - tmp) << 2;
962
963 /* update pointer to offset location.
964 * This is a 64bit quantity, so we need to
965 * deal with 3 cases:
966 * - entirely in first page
967 * - entirely in second page
968 * - 4 bytes in each page
969 */
970 if (offset_r + 8 <= len1) {
971 cd->offset = p + (cd->offset - tmp);
972 } else if (offset_r >= len1) {
973 cd->offset -= len1 >> 2;
974 } else {
975 /* sitting on the fence */
976 BUG_ON(offset_r != len1 - 4);
977 cd->offset = p + (cd->offset - tmp);
978 cd->offset1 = tmp;
979 }
980
981 len2 = (num_entry_words << 2) - len1;
982
983 /* move from temp page to current and next pages */
984 memmove(p, tmp, len1);
985 memmove(tmp, (caddr_t)tmp+len1, len2);
986
987 p = tmp + (len2 >> 2);
988 }
989 }
990 else {
991 cd->common.err = nfserr_toosmall;
992 return -EINVAL;
993 }
994
995 cd->buflen -= num_entry_words;
996 cd->buffer = p;
997 cd->common.err = nfs_ok;
998 return 0;
999
1000}
1001
1002int
a0ad13ef
N
1003nfs3svc_encode_entry(void *cd, const char *name,
1004 int namlen, loff_t offset, u64 ino, unsigned int d_type)
1da177e4
LT
1005{
1006 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1007}
1008
1009int
a0ad13ef
N
1010nfs3svc_encode_entry_plus(void *cd, const char *name,
1011 int namlen, loff_t offset, u64 ino,
1012 unsigned int d_type)
1da177e4
LT
1013{
1014 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1015}
1016
1017/* FSSTAT */
1018int
91f07168 1019nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
1020 struct nfsd3_fsstatres *resp)
1021{
1022 struct kstatfs *s = &resp->stats;
1023 u64 bs = s->f_bsize;
1024
1025 *p++ = xdr_zero; /* no post_op_attr */
1026
1027 if (resp->status == 0) {
1028 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1029 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1030 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1031 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1032 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1033 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1034 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1035 }
1036 return xdr_ressize_check(rqstp, p);
1037}
1038
1039/* FSINFO */
1040int
91f07168 1041nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
1042 struct nfsd3_fsinfores *resp)
1043{
1044 *p++ = xdr_zero; /* no post_op_attr */
1045
1046 if (resp->status == 0) {
1047 *p++ = htonl(resp->f_rtmax);
1048 *p++ = htonl(resp->f_rtpref);
1049 *p++ = htonl(resp->f_rtmult);
1050 *p++ = htonl(resp->f_wtmax);
1051 *p++ = htonl(resp->f_wtpref);
1052 *p++ = htonl(resp->f_wtmult);
1053 *p++ = htonl(resp->f_dtpref);
1054 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1055 *p++ = xdr_one;
1056 *p++ = xdr_zero;
1057 *p++ = htonl(resp->f_properties);
1058 }
1059
1060 return xdr_ressize_check(rqstp, p);
1061}
1062
1063/* PATHCONF */
1064int
91f07168 1065nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
1066 struct nfsd3_pathconfres *resp)
1067{
1068 *p++ = xdr_zero; /* no post_op_attr */
1069
1070 if (resp->status == 0) {
1071 *p++ = htonl(resp->p_link_max);
1072 *p++ = htonl(resp->p_name_max);
1073 *p++ = htonl(resp->p_no_trunc);
1074 *p++ = htonl(resp->p_chown_restricted);
1075 *p++ = htonl(resp->p_case_insensitive);
1076 *p++ = htonl(resp->p_case_preserving);
1077 }
1078
1079 return xdr_ressize_check(rqstp, p);
1080}
1081
1082/* COMMIT */
1083int
91f07168 1084nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
1085 struct nfsd3_commitres *resp)
1086{
b9c0ef85
SK
1087 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1088
1da177e4
LT
1089 p = encode_wcc_data(rqstp, p, &resp->fh);
1090 /* Write verifier */
1091 if (resp->status == 0) {
b9c0ef85
SK
1092 *p++ = htonl(nn->nfssvc_boot.tv_sec);
1093 *p++ = htonl(nn->nfssvc_boot.tv_usec);
1da177e4
LT
1094 }
1095 return xdr_ressize_check(rqstp, p);
1096}
1097
1098/*
1099 * XDR release functions
1100 */
1101int
91f07168 1102nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
1103 struct nfsd3_attrstat *resp)
1104{
1105 fh_put(&resp->fh);
1106 return 1;
1107}
1108
1109int
91f07168 1110nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
1da177e4
LT
1111 struct nfsd3_fhandle_pair *resp)
1112{
1113 fh_put(&resp->fh1);
1114 fh_put(&resp->fh2);
1115 return 1;
1116}