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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / fs / nfsd / nfs3xdr.c
blob43f46cd9edea84e18040381a2647a54ca59debb0
1 /*
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
9 #include <linux/namei.h>
10 #include "xdr3.h"
11 #include "auth.h"
12
13 #define NFSDDBG_FACILITY NFSDDBG_XDR
14
15
16 /*
17 * Mapping of S_IF* types to NFS file types
18 */
19 static u32 nfs3_ftypes[] = {
20 NF3NON, NF3FIFO, NF3CHR, NF3BAD,
21 NF3DIR, NF3BAD, NF3BLK, NF3BAD,
22 NF3REG, NF3BAD, NF3LNK, NF3BAD,
23 NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
24 };
25
26 /*
27 * XDR functions for basic NFS types
28 */
29 static __be32 *
30 encode_time3(__be32 *p, struct timespec *time)
31 {
32 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
33 return p;
34 }
35
36 static __be32 *
37 decode_time3(__be32 *p, struct timespec *time)
38 {
39 time->tv_sec = ntohl(*p++);
40 time->tv_nsec = ntohl(*p++);
41 return p;
42 }
43
44 static __be32 *
45 decode_fh(__be32 *p, struct svc_fh *fhp)
46 {
47 unsigned int size;
48 fh_init(fhp, NFS3_FHSIZE);
49 size = ntohl(*p++);
50 if (size > NFS3_FHSIZE)
51 return NULL;
52
53 memcpy(&fhp->fh_handle.fh_base, p, size);
54 fhp->fh_handle.fh_size = size;
55 return p + XDR_QUADLEN(size);
56 }
57
58 /* Helper function for NFSv3 ACL code */
59 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
60 {
61 return decode_fh(p, fhp);
62 }
63
64 static __be32 *
65 encode_fh(__be32 *p, struct svc_fh *fhp)
66 {
67 unsigned int size = fhp->fh_handle.fh_size;
68 *p++ = htonl(size);
69 if (size) p[XDR_QUADLEN(size)-1]=0;
70 memcpy(p, &fhp->fh_handle.fh_base, size);
71 return p + XDR_QUADLEN(size);
72 }
73
74 /*
75 * Decode a file name and make sure that the path contains
76 * no slashes or null bytes.
77 */
78 static __be32 *
79 decode_filename(__be32 *p, char **namp, unsigned int *lenp)
80 {
81 char *name;
82 unsigned int i;
83
84 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
85 for (i = 0, name = *namp; i < *lenp; i++, name++) {
86 if (*name == '\0' || *name == '/')
87 return NULL;
88 }
89 }
90
91 return p;
92 }
93
94 static __be32 *
95 decode_sattr3(__be32 *p, struct iattr *iap)
96 {
97 u32 tmp;
98
99 iap->ia_valid = 0;
100
101 if (*p++) {
102 iap->ia_valid |= ATTR_MODE;
103 iap->ia_mode = ntohl(*p++);
104 }
105 if (*p++) {
106 iap->ia_valid |= ATTR_UID;
107 iap->ia_uid = ntohl(*p++);
108 }
109 if (*p++) {
110 iap->ia_valid |= ATTR_GID;
111 iap->ia_gid = ntohl(*p++);
112 }
113 if (*p++) {
114 u64 newsize;
115
116 iap->ia_valid |= ATTR_SIZE;
117 p = xdr_decode_hyper(p, &newsize);
118 if (newsize <= NFS_OFFSET_MAX)
119 iap->ia_size = newsize;
120 else
121 iap->ia_size = NFS_OFFSET_MAX;
122 }
123 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
124 iap->ia_valid |= ATTR_ATIME;
125 } else if (tmp == 2) { /* set to client time */
126 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
127 iap->ia_atime.tv_sec = ntohl(*p++);
128 iap->ia_atime.tv_nsec = ntohl(*p++);
129 }
130 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
131 iap->ia_valid |= ATTR_MTIME;
132 } else if (tmp == 2) { /* set to client time */
133 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
134 iap->ia_mtime.tv_sec = ntohl(*p++);
135 iap->ia_mtime.tv_nsec = ntohl(*p++);
136 }
137 return p;
138 }
139
140 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
141 {
142 u64 f;
143 switch(fsid_source(fhp)) {
144 default:
145 case FSIDSOURCE_DEV:
146 p = xdr_encode_hyper(p, (u64)huge_encode_dev
147 (fhp->fh_dentry->d_inode->i_sb->s_dev));
148 break;
149 case FSIDSOURCE_FSID:
150 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
151 break;
152 case FSIDSOURCE_UUID:
153 f = ((u64*)fhp->fh_export->ex_uuid)[0];
154 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
155 p = xdr_encode_hyper(p, f);
156 break;
157 }
158 return p;
159 }
160
161 static __be32 *
162 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
163 struct kstat *stat)
164 {
165 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
166 *p++ = htonl((u32) stat->mode);
167 *p++ = htonl((u32) stat->nlink);
168 *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
169 *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
170 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
171 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
172 } else {
173 p = xdr_encode_hyper(p, (u64) stat->size);
174 }
175 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
176 *p++ = htonl((u32) MAJOR(stat->rdev));
177 *p++ = htonl((u32) MINOR(stat->rdev));
178 p = encode_fsid(p, fhp);
179 p = xdr_encode_hyper(p, stat->ino);
180 p = encode_time3(p, &stat->atime);
181 p = encode_time3(p, &stat->mtime);
182 p = encode_time3(p, &stat->ctime);
183
184 return p;
185 }
186
187 static __be32 *
188 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
189 {
190 /* Attributes to follow */
191 *p++ = xdr_one;
192 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
193 }
194
195 /*
196 * Encode post-operation attributes.
197 * The inode may be NULL if the call failed because of a stale file
198 * handle. In this case, no attributes are returned.
199 */
200 static __be32 *
201 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
202 {
203 struct dentry *dentry = fhp->fh_dentry;
204 if (dentry && dentry->d_inode) {
205 int err;
206 struct kstat stat;
207
208 err = vfs_getattr(fhp->fh_export->ex_path.mnt, dentry, &stat);
209 if (!err) {
210 *p++ = xdr_one; /* attributes follow */
211 lease_get_mtime(dentry->d_inode, &stat.mtime);
212 return encode_fattr3(rqstp, p, fhp, &stat);
213 }
214 }
215 *p++ = xdr_zero;
216 return p;
217 }
218
219 /* Helper for NFSv3 ACLs */
220 __be32 *
221 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
222 {
223 return encode_post_op_attr(rqstp, p, fhp);
224 }
225
226 /*
227 * Enocde weak cache consistency data
228 */
229 static __be32 *
230 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
231 {
232 struct dentry *dentry = fhp->fh_dentry;
233
234 if (dentry && dentry->d_inode && fhp->fh_post_saved) {
235 if (fhp->fh_pre_saved) {
236 *p++ = xdr_one;
237 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
238 p = encode_time3(p, &fhp->fh_pre_mtime);
239 p = encode_time3(p, &fhp->fh_pre_ctime);
240 } else {
241 *p++ = xdr_zero;
242 }
243 return encode_saved_post_attr(rqstp, p, fhp);
244 }
245 /* no pre- or post-attrs */
246 *p++ = xdr_zero;
247 return encode_post_op_attr(rqstp, p, fhp);
248 }
249
250 /*
251 * Fill in the post_op attr for the wcc data
252 */
253 void fill_post_wcc(struct svc_fh *fhp)
254 {
255 int err;
256
257 if (fhp->fh_post_saved)
258 printk("nfsd: inode locked twice during operation.\n");
259
260 err = vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry,
261 &fhp->fh_post_attr);
262 fhp->fh_post_change = fhp->fh_dentry->d_inode->i_version;
263 if (err) {
264 fhp->fh_post_saved = 0;
265 /* Grab the ctime anyway - set_change_info might use it */
266 fhp->fh_post_attr.ctime = fhp->fh_dentry->d_inode->i_ctime;
267 } else
268 fhp->fh_post_saved = 1;
269 }
270
271 /*
272 * XDR decode functions
273 */
274 int
275 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
276 {
277 if (!(p = decode_fh(p, &args->fh)))
278 return 0;
279 return xdr_argsize_check(rqstp, p);
280 }
281
282 int
283 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
284 struct nfsd3_sattrargs *args)
285 {
286 if (!(p = decode_fh(p, &args->fh)))
287 return 0;
288 p = decode_sattr3(p, &args->attrs);
289
290 if ((args->check_guard = ntohl(*p++)) != 0) {
291 struct timespec time;
292 p = decode_time3(p, &time);
293 args->guardtime = time.tv_sec;
294 }
295
296 return xdr_argsize_check(rqstp, p);
297 }
298
299 int
300 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
301 struct nfsd3_diropargs *args)
302 {
303 if (!(p = decode_fh(p, &args->fh))
304 || !(p = decode_filename(p, &args->name, &args->len)))
305 return 0;
306
307 return xdr_argsize_check(rqstp, p);
308 }
309
310 int
311 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
312 struct nfsd3_accessargs *args)
313 {
314 if (!(p = decode_fh(p, &args->fh)))
315 return 0;
316 args->access = ntohl(*p++);
317
318 return xdr_argsize_check(rqstp, p);
319 }
320
321 int
322 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
323 struct nfsd3_readargs *args)
324 {
325 unsigned int len;
326 int v,pn;
327 u32 max_blocksize = svc_max_payload(rqstp);
328
329 if (!(p = decode_fh(p, &args->fh)))
330 return 0;
331 p = xdr_decode_hyper(p, &args->offset);
332
333 len = args->count = ntohl(*p++);
334
335 if (len > max_blocksize)
336 len = max_blocksize;
337
338 /* set up the kvec */
339 v=0;
340 while (len > 0) {
341 pn = rqstp->rq_resused++;
342 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
343 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
344 len -= rqstp->rq_vec[v].iov_len;
345 v++;
346 }
347 args->vlen = v;
348 return xdr_argsize_check(rqstp, p);
349 }
350
351 int
352 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
353 struct nfsd3_writeargs *args)
354 {
355 unsigned int len, v, hdr, dlen;
356 u32 max_blocksize = svc_max_payload(rqstp);
357
358 if (!(p = decode_fh(p, &args->fh)))
359 return 0;
360 p = xdr_decode_hyper(p, &args->offset);
361
362 args->count = ntohl(*p++);
363 args->stable = ntohl(*p++);
364 len = args->len = ntohl(*p++);
365 /*
366 * The count must equal the amount of data passed.
367 */
368 if (args->count != args->len)
369 return 0;
370
371 /*
372 * Check to make sure that we got the right number of
373 * bytes.
374 */
375 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
376 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
377 - hdr;
378 /*
379 * Round the length of the data which was specified up to
380 * the next multiple of XDR units and then compare that
381 * against the length which was actually received.
382 * Note that when RPCSEC/GSS (for example) is used, the
383 * data buffer can be padded so dlen might be larger
384 * than required. It must never be smaller.
385 */
386 if (dlen < XDR_QUADLEN(len)*4)
387 return 0;
388
389 if (args->count > max_blocksize) {
390 args->count = max_blocksize;
391 len = args->len = max_blocksize;
392 }
393 rqstp->rq_vec[0].iov_base = (void*)p;
394 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
395 v = 0;
396 while (len > rqstp->rq_vec[v].iov_len) {
397 len -= rqstp->rq_vec[v].iov_len;
398 v++;
399 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
400 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
401 }
402 rqstp->rq_vec[v].iov_len = len;
403 args->vlen = v + 1;
404 return 1;
405 }
406
407 int
408 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
409 struct nfsd3_createargs *args)
410 {
411 if (!(p = decode_fh(p, &args->fh))
412 || !(p = decode_filename(p, &args->name, &args->len)))
413 return 0;
414
415 switch (args->createmode = ntohl(*p++)) {
416 case NFS3_CREATE_UNCHECKED:
417 case NFS3_CREATE_GUARDED:
418 p = decode_sattr3(p, &args->attrs);
419 break;
420 case NFS3_CREATE_EXCLUSIVE:
421 args->verf = p;
422 p += 2;
423 break;
424 default:
425 return 0;
426 }
427
428 return xdr_argsize_check(rqstp, p);
429 }
430 int
431 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
432 struct nfsd3_createargs *args)
433 {
434 if (!(p = decode_fh(p, &args->fh)) ||
435 !(p = decode_filename(p, &args->name, &args->len)))
436 return 0;
437 p = decode_sattr3(p, &args->attrs);
438
439 return xdr_argsize_check(rqstp, p);
440 }
441
442 int
443 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
444 struct nfsd3_symlinkargs *args)
445 {
446 unsigned int len, avail;
447 char *old, *new;
448 struct kvec *vec;
449
450 if (!(p = decode_fh(p, &args->ffh)) ||
451 !(p = decode_filename(p, &args->fname, &args->flen))
452 )
453 return 0;
454 p = decode_sattr3(p, &args->attrs);
455
456 /* now decode the pathname, which might be larger than the first page.
457 * As we have to check for nul's anyway, we copy it into a new page
458 * This page appears in the rq_res.pages list, but as pages_len is always
459 * 0, it won't get in the way
460 */
461 len = ntohl(*p++);
462 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
463 return 0;
464 args->tname = new =
465 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
466 args->tlen = len;
467 /* first copy and check from the first page */
468 old = (char*)p;
469 vec = &rqstp->rq_arg.head[0];
470 avail = vec->iov_len - (old - (char*)vec->iov_base);
471 while (len && avail && *old) {
472 *new++ = *old++;
473 len--;
474 avail--;
475 }
476 /* now copy next page if there is one */
477 if (len && !avail && rqstp->rq_arg.page_len) {
478 avail = rqstp->rq_arg.page_len;
479 if (avail > PAGE_SIZE)
480 avail = PAGE_SIZE;
481 old = page_address(rqstp->rq_arg.pages[0]);
482 }
483 while (len && avail && *old) {
484 *new++ = *old++;
485 len--;
486 avail--;
487 }
488 *new = '\0';
489 if (len)
490 return 0;
491
492 return 1;
493 }
494
495 int
496 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
497 struct nfsd3_mknodargs *args)
498 {
499 if (!(p = decode_fh(p, &args->fh))
500 || !(p = decode_filename(p, &args->name, &args->len)))
501 return 0;
502
503 args->ftype = ntohl(*p++);
504
505 if (args->ftype == NF3BLK || args->ftype == NF3CHR
506 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
507 p = decode_sattr3(p, &args->attrs);
508
509 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
510 args->major = ntohl(*p++);
511 args->minor = ntohl(*p++);
512 }
513
514 return xdr_argsize_check(rqstp, p);
515 }
516
517 int
518 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
519 struct nfsd3_renameargs *args)
520 {
521 if (!(p = decode_fh(p, &args->ffh))
522 || !(p = decode_filename(p, &args->fname, &args->flen))
523 || !(p = decode_fh(p, &args->tfh))
524 || !(p = decode_filename(p, &args->tname, &args->tlen)))
525 return 0;
526
527 return xdr_argsize_check(rqstp, p);
528 }
529
530 int
531 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
532 struct nfsd3_readlinkargs *args)
533 {
534 if (!(p = decode_fh(p, &args->fh)))
535 return 0;
536 args->buffer =
537 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
538
539 return xdr_argsize_check(rqstp, p);
540 }
541
542 int
543 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
544 struct nfsd3_linkargs *args)
545 {
546 if (!(p = decode_fh(p, &args->ffh))
547 || !(p = decode_fh(p, &args->tfh))
548 || !(p = decode_filename(p, &args->tname, &args->tlen)))
549 return 0;
550
551 return xdr_argsize_check(rqstp, p);
552 }
553
554 int
555 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
556 struct nfsd3_readdirargs *args)
557 {
558 if (!(p = decode_fh(p, &args->fh)))
559 return 0;
560 p = xdr_decode_hyper(p, &args->cookie);
561 args->verf = p; p += 2;
562 args->dircount = ~0;
563 args->count = ntohl(*p++);
564
565 if (args->count > PAGE_SIZE)
566 args->count = PAGE_SIZE;
567
568 args->buffer =
569 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
570
571 return xdr_argsize_check(rqstp, p);
572 }
573
574 int
575 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
576 struct nfsd3_readdirargs *args)
577 {
578 int len, pn;
579 u32 max_blocksize = svc_max_payload(rqstp);
580
581 if (!(p = decode_fh(p, &args->fh)))
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
588 len = (args->count > max_blocksize) ? max_blocksize :
589 args->count;
590 args->count = len;
591
592 while (len > 0) {
593 pn = rqstp->rq_resused++;
594 if (!args->buffer)
595 args->buffer = page_address(rqstp->rq_respages[pn]);
596 len -= PAGE_SIZE;
597 }
598
599 return xdr_argsize_check(rqstp, p);
600 }
601
602 int
603 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
604 struct nfsd3_commitargs *args)
605 {
606 if (!(p = decode_fh(p, &args->fh)))
607 return 0;
608 p = xdr_decode_hyper(p, &args->offset);
609 args->count = ntohl(*p++);
610
611 return xdr_argsize_check(rqstp, p);
612 }
613
614 /*
615 * XDR encode functions
616 */
617 /*
618 * There must be an encoding function for void results so svc_process
619 * will work properly.
620 */
621 int
622 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
623 {
624 return xdr_ressize_check(rqstp, p);
625 }
626
627 /* GETATTR */
628 int
629 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
630 struct nfsd3_attrstat *resp)
631 {
632 if (resp->status == 0) {
633 lease_get_mtime(resp->fh.fh_dentry->d_inode,
634 &resp->stat.mtime);
635 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
636 }
637 return xdr_ressize_check(rqstp, p);
638 }
639
640 /* SETATTR, REMOVE, RMDIR */
641 int
642 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
643 struct nfsd3_attrstat *resp)
644 {
645 p = encode_wcc_data(rqstp, p, &resp->fh);
646 return xdr_ressize_check(rqstp, p);
647 }
648
649 /* LOOKUP */
650 int
651 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
652 struct nfsd3_diropres *resp)
653 {
654 if (resp->status == 0) {
655 p = encode_fh(p, &resp->fh);
656 p = encode_post_op_attr(rqstp, p, &resp->fh);
657 }
658 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
659 return xdr_ressize_check(rqstp, p);
660 }
661
662 /* ACCESS */
663 int
664 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
665 struct nfsd3_accessres *resp)
666 {
667 p = encode_post_op_attr(rqstp, p, &resp->fh);
668 if (resp->status == 0)
669 *p++ = htonl(resp->access);
670 return xdr_ressize_check(rqstp, p);
671 }
672
673 /* READLINK */
674 int
675 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
676 struct nfsd3_readlinkres *resp)
677 {
678 p = encode_post_op_attr(rqstp, p, &resp->fh);
679 if (resp->status == 0) {
680 *p++ = htonl(resp->len);
681 xdr_ressize_check(rqstp, p);
682 rqstp->rq_res.page_len = resp->len;
683 if (resp->len & 3) {
684 /* need to pad the tail */
685 rqstp->rq_res.tail[0].iov_base = p;
686 *p = 0;
687 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
688 }
689 return 1;
690 } else
691 return xdr_ressize_check(rqstp, p);
692 }
693
694 /* READ */
695 int
696 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
697 struct nfsd3_readres *resp)
698 {
699 p = encode_post_op_attr(rqstp, p, &resp->fh);
700 if (resp->status == 0) {
701 *p++ = htonl(resp->count);
702 *p++ = htonl(resp->eof);
703 *p++ = htonl(resp->count); /* xdr opaque count */
704 xdr_ressize_check(rqstp, p);
705 /* now update rqstp->rq_res to reflect data as well */
706 rqstp->rq_res.page_len = resp->count;
707 if (resp->count & 3) {
708 /* need to pad the tail */
709 rqstp->rq_res.tail[0].iov_base = p;
710 *p = 0;
711 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
712 }
713 return 1;
714 } else
715 return xdr_ressize_check(rqstp, p);
716 }
717
718 /* WRITE */
719 int
720 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
721 struct nfsd3_writeres *resp)
722 {
723 p = encode_wcc_data(rqstp, p, &resp->fh);
724 if (resp->status == 0) {
725 *p++ = htonl(resp->count);
726 *p++ = htonl(resp->committed);
727 *p++ = htonl(nfssvc_boot.tv_sec);
728 *p++ = htonl(nfssvc_boot.tv_usec);
729 }
730 return xdr_ressize_check(rqstp, p);
731 }
732
733 /* CREATE, MKDIR, SYMLINK, MKNOD */
734 int
735 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
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 */
748 int
749 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
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 */
758 int
759 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
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 */
768 int
769 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
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. */
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
792 static __be32 *
793 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
794 int namlen, u64 ino)
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
806 static __be32
807 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
808 const char *name, int namlen)
809 {
810 struct svc_export *exp;
811 struct dentry *dparent, *dchild;
812 __be32 rv = nfserr_noent;
813
814 dparent = cd->fh.fh_dentry;
815 exp = cd->fh.fh_export;
816
817 if (isdotent(name, namlen)) {
818 if (namlen == 2) {
819 dchild = dget_parent(dparent);
820 /* filesystem root - cannot return filehandle for ".." */
821 if (dchild == dparent)
822 goto out;
823 } else
824 dchild = dget(dparent);
825 } else
826 dchild = lookup_one_len(name, dparent, namlen);
827 if (IS_ERR(dchild))
828 return rv;
829 if (d_mountpoint(dchild))
830 goto out;
831 if (!dchild->d_inode)
832 goto out;
833 rv = fh_compose(fhp, exp, dchild, &cd->fh);
834 out:
835 dput(dchild);
836 return rv;
837 }
838
839 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen)
840 {
841 struct svc_fh fh;
842 __be32 err;
843
844 fh_init(&fh, NFS3_FHSIZE);
845 err = compose_entry_fh(cd, &fh, name, namlen);
846 if (err) {
847 *p++ = 0;
848 *p++ = 0;
849 goto out;
850 }
851 p = encode_post_op_attr(cd->rqstp, p, &fh);
852 *p++ = xdr_one; /* yes, a file handle follows */
853 p = encode_fh(p, &fh);
854 out:
855 fh_put(&fh);
856 return p;
857 }
858
859 /*
860 * Encode a directory entry. This one works for both normal readdir
861 * and readdirplus.
862 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
863 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
864 *
865 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
866 * file handle.
867 */
868
869 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
870 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
871 static int
872 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
873 loff_t offset, u64 ino, unsigned int d_type, int plus)
874 {
875 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
876 common);
877 __be32 *p = cd->buffer;
878 caddr_t curr_page_addr = NULL;
879 int pn; /* current page number */
880 int slen; /* string (name) length */
881 int elen; /* estimated entry length in words */
882 int num_entry_words = 0; /* actual number of words */
883
884 if (cd->offset) {
885 u64 offset64 = offset;
886
887 if (unlikely(cd->offset1)) {
888 /* we ended up with offset on a page boundary */
889 *cd->offset = htonl(offset64 >> 32);
890 *cd->offset1 = htonl(offset64 & 0xffffffff);
891 cd->offset1 = NULL;
892 } else {
893 xdr_encode_hyper(cd->offset, offset64);
894 }
895 }
896
897 /*
898 dprintk("encode_entry(%.*s @%ld%s)\n",
899 namlen, name, (long) offset, plus? " plus" : "");
900 */
901
902 /* truncate filename if too long */
903 if (namlen > NFS3_MAXNAMLEN)
904 namlen = NFS3_MAXNAMLEN;
905
906 slen = XDR_QUADLEN(namlen);
907 elen = slen + NFS3_ENTRY_BAGGAGE
908 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
909
910 if (cd->buflen < elen) {
911 cd->common.err = nfserr_toosmall;
912 return -EINVAL;
913 }
914
915 /* determine which page in rq_respages[] we are currently filling */
916 for (pn=1; pn < cd->rqstp->rq_resused; pn++) {
917 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
918
919 if (((caddr_t)cd->buffer >= curr_page_addr) &&
920 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
921 break;
922 }
923
924 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
925 /* encode entry in current page */
926
927 p = encode_entry_baggage(cd, p, name, namlen, ino);
928
929 if (plus)
930 p = encode_entryplus_baggage(cd, p, name, namlen);
931 num_entry_words = p - cd->buffer;
932 } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
933 /* temporarily encode entry into next page, then move back to
934 * current and next page in rq_respages[] */
935 __be32 *p1, *tmp;
936 int len1, len2;
937
938 /* grab next page for temporary storage of entry */
939 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
940
941 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
942
943 if (plus)
944 p1 = encode_entryplus_baggage(cd, p1, name, namlen);
945
946 /* determine entry word length and lengths to go in pages */
947 num_entry_words = p1 - tmp;
948 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
949 if ((num_entry_words << 2) < len1) {
950 /* the actual number of words in the entry is less
951 * than elen and can still fit in the current page
952 */
953 memmove(p, tmp, num_entry_words << 2);
954 p += num_entry_words;
955
956 /* update offset */
957 cd->offset = cd->buffer + (cd->offset - tmp);
958 } else {
959 unsigned int offset_r = (cd->offset - tmp) << 2;
960
961 /* update pointer to offset location.
962 * This is a 64bit quantity, so we need to
963 * deal with 3 cases:
964 * - entirely in first page
965 * - entirely in second page
966 * - 4 bytes in each page
967 */
968 if (offset_r + 8 <= len1) {
969 cd->offset = p + (cd->offset - tmp);
970 } else if (offset_r >= len1) {
971 cd->offset -= len1 >> 2;
972 } else {
973 /* sitting on the fence */
974 BUG_ON(offset_r != len1 - 4);
975 cd->offset = p + (cd->offset - tmp);
976 cd->offset1 = tmp;
977 }
978
979 len2 = (num_entry_words << 2) - len1;
980
981 /* move from temp page to current and next pages */
982 memmove(p, tmp, len1);
983 memmove(tmp, (caddr_t)tmp+len1, len2);
984
985 p = tmp + (len2 >> 2);
986 }
987 }
988 else {
989 cd->common.err = nfserr_toosmall;
990 return -EINVAL;
991 }
992
993 cd->buflen -= num_entry_words;
994 cd->buffer = p;
995 cd->common.err = nfs_ok;
996 return 0;
997
998 }
999
1000 int
1001 nfs3svc_encode_entry(void *cd, const char *name,
1002 int namlen, loff_t offset, u64 ino, unsigned int d_type)
1003 {
1004 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1005 }
1006
1007 int
1008 nfs3svc_encode_entry_plus(void *cd, const char *name,
1009 int namlen, loff_t offset, u64 ino,
1010 unsigned int d_type)
1011 {
1012 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1013 }
1014
1015 /* FSSTAT */
1016 int
1017 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1018 struct nfsd3_fsstatres *resp)
1019 {
1020 struct kstatfs *s = &resp->stats;
1021 u64 bs = s->f_bsize;
1022
1023 *p++ = xdr_zero; /* no post_op_attr */
1024
1025 if (resp->status == 0) {
1026 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1027 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1028 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1029 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1030 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1031 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1032 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1033 }
1034 return xdr_ressize_check(rqstp, p);
1035 }
1036
1037 /* FSINFO */
1038 int
1039 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1040 struct nfsd3_fsinfores *resp)
1041 {
1042 *p++ = xdr_zero; /* no post_op_attr */
1043
1044 if (resp->status == 0) {
1045 *p++ = htonl(resp->f_rtmax);
1046 *p++ = htonl(resp->f_rtpref);
1047 *p++ = htonl(resp->f_rtmult);
1048 *p++ = htonl(resp->f_wtmax);
1049 *p++ = htonl(resp->f_wtpref);
1050 *p++ = htonl(resp->f_wtmult);
1051 *p++ = htonl(resp->f_dtpref);
1052 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1053 *p++ = xdr_one;
1054 *p++ = xdr_zero;
1055 *p++ = htonl(resp->f_properties);
1056 }
1057
1058 return xdr_ressize_check(rqstp, p);
1059 }
1060
1061 /* PATHCONF */
1062 int
1063 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1064 struct nfsd3_pathconfres *resp)
1065 {
1066 *p++ = xdr_zero; /* no post_op_attr */
1067
1068 if (resp->status == 0) {
1069 *p++ = htonl(resp->p_link_max);
1070 *p++ = htonl(resp->p_name_max);
1071 *p++ = htonl(resp->p_no_trunc);
1072 *p++ = htonl(resp->p_chown_restricted);
1073 *p++ = htonl(resp->p_case_insensitive);
1074 *p++ = htonl(resp->p_case_preserving);
1075 }
1076
1077 return xdr_ressize_check(rqstp, p);
1078 }
1079
1080 /* COMMIT */
1081 int
1082 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1083 struct nfsd3_commitres *resp)
1084 {
1085 p = encode_wcc_data(rqstp, p, &resp->fh);
1086 /* Write verifier */
1087 if (resp->status == 0) {
1088 *p++ = htonl(nfssvc_boot.tv_sec);
1089 *p++ = htonl(nfssvc_boot.tv_usec);
1090 }
1091 return xdr_ressize_check(rqstp, p);
1092 }
1093
1094 /*
1095 * XDR release functions
1096 */
1097 int
1098 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1099 struct nfsd3_attrstat *resp)
1100 {
1101 fh_put(&resp->fh);
1102 return 1;
1103 }
1104
1105 int
1106 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
1107 struct nfsd3_fhandle_pair *resp)
1108 {
1109 fh_put(&resp->fh1);
1110 fh_put(&resp->fh2);
1111 return 1;
1112 }