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sunrpc: fix error path in module_init
[linux-2.6.git] / fs / nfsd / nfs3xdr.c
blob43fb360784b7ef5a3cb6233d936c9387e594460c
1 /*
2 * linux/fs/nfsd/nfs3xdr.c
3 *
4 * XDR support for nfsd/protocol version 3.
5 *
6 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
7 *
8 * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
9 */
10
11 #include <linux/types.h>
12 #include <linux/time.h>
13 #include <linux/nfs3.h>
14 #include <linux/list.h>
15 #include <linux/spinlock.h>
16 #include <linux/dcache.h>
17 #include <linux/namei.h>
18 #include <linux/mm.h>
19 #include <linux/vfs.h>
20 #include <linux/sunrpc/xdr.h>
21 #include <linux/sunrpc/svc.h>
22 #include <linux/nfsd/nfsd.h>
23 #include <linux/nfsd/xdr3.h>
24
25 #define NFSDDBG_FACILITY NFSDDBG_XDR
26
27
28 /*
29 * Mapping of S_IF* types to NFS file types
30 */
31 static u32 nfs3_ftypes[] = {
32 NF3NON, NF3FIFO, NF3CHR, NF3BAD,
33 NF3DIR, NF3BAD, NF3BLK, NF3BAD,
34 NF3REG, NF3BAD, NF3LNK, NF3BAD,
35 NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
36 };
37
38 /*
39 * XDR functions for basic NFS types
40 */
41 static __be32 *
42 encode_time3(__be32 *p, struct timespec *time)
43 {
44 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
45 return p;
46 }
47
48 static __be32 *
49 decode_time3(__be32 *p, struct timespec *time)
50 {
51 time->tv_sec = ntohl(*p++);
52 time->tv_nsec = ntohl(*p++);
53 return p;
54 }
55
56 static __be32 *
57 decode_fh(__be32 *p, struct svc_fh *fhp)
58 {
59 unsigned int size;
60 fh_init(fhp, NFS3_FHSIZE);
61 size = ntohl(*p++);
62 if (size > NFS3_FHSIZE)
63 return NULL;
64
65 memcpy(&fhp->fh_handle.fh_base, p, size);
66 fhp->fh_handle.fh_size = size;
67 return p + XDR_QUADLEN(size);
68 }
69
70 /* Helper function for NFSv3 ACL code */
71 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
72 {
73 return decode_fh(p, fhp);
74 }
75
76 static __be32 *
77 encode_fh(__be32 *p, struct svc_fh *fhp)
78 {
79 unsigned int size = fhp->fh_handle.fh_size;
80 *p++ = htonl(size);
81 if (size) p[XDR_QUADLEN(size)-1]=0;
82 memcpy(p, &fhp->fh_handle.fh_base, size);
83 return p + XDR_QUADLEN(size);
84 }
85
86 /*
87 * Decode a file name and make sure that the path contains
88 * no slashes or null bytes.
89 */
90 static __be32 *
91 decode_filename(__be32 *p, char **namp, int *lenp)
92 {
93 char *name;
94 int i;
95
96 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
97 for (i = 0, name = *namp; i < *lenp; i++, name++) {
98 if (*name == '\0' || *name == '/')
99 return NULL;
100 }
101 }
102
103 return p;
104 }
105
106 static __be32 *
107 decode_sattr3(__be32 *p, struct iattr *iap)
108 {
109 u32 tmp;
110
111 iap->ia_valid = 0;
112
113 if (*p++) {
114 iap->ia_valid |= ATTR_MODE;
115 iap->ia_mode = ntohl(*p++);
116 }
117 if (*p++) {
118 iap->ia_valid |= ATTR_UID;
119 iap->ia_uid = ntohl(*p++);
120 }
121 if (*p++) {
122 iap->ia_valid |= ATTR_GID;
123 iap->ia_gid = ntohl(*p++);
124 }
125 if (*p++) {
126 u64 newsize;
127
128 iap->ia_valid |= ATTR_SIZE;
129 p = xdr_decode_hyper(p, &newsize);
130 if (newsize <= NFS_OFFSET_MAX)
131 iap->ia_size = newsize;
132 else
133 iap->ia_size = NFS_OFFSET_MAX;
134 }
135 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
136 iap->ia_valid |= ATTR_ATIME;
137 } else if (tmp == 2) { /* set to client time */
138 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
139 iap->ia_atime.tv_sec = ntohl(*p++);
140 iap->ia_atime.tv_nsec = ntohl(*p++);
141 }
142 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
143 iap->ia_valid |= ATTR_MTIME;
144 } else if (tmp == 2) { /* set to client time */
145 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
146 iap->ia_mtime.tv_sec = ntohl(*p++);
147 iap->ia_mtime.tv_nsec = ntohl(*p++);
148 }
149 return p;
150 }
151
152 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
153 {
154 u64 f;
155 switch(fsid_source(fhp)) {
156 default:
157 case FSIDSOURCE_DEV:
158 p = xdr_encode_hyper(p, (u64)huge_encode_dev
159 (fhp->fh_dentry->d_inode->i_sb->s_dev));
160 break;
161 case FSIDSOURCE_FSID:
162 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
163 break;
164 case FSIDSOURCE_UUID:
165 f = ((u64*)fhp->fh_export->ex_uuid)[0];
166 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
167 p = xdr_encode_hyper(p, f);
168 break;
169 }
170 return p;
171 }
172
173 static __be32 *
174 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
175 struct kstat *stat)
176 {
177 struct dentry *dentry = fhp->fh_dentry;
178 struct timespec time;
179
180 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
181 *p++ = htonl((u32) stat->mode);
182 *p++ = htonl((u32) stat->nlink);
183 *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
184 *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
185 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
186 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
187 } else {
188 p = xdr_encode_hyper(p, (u64) stat->size);
189 }
190 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
191 *p++ = htonl((u32) MAJOR(stat->rdev));
192 *p++ = htonl((u32) MINOR(stat->rdev));
193 p = encode_fsid(p, fhp);
194 p = xdr_encode_hyper(p, (u64) stat->ino);
195 p = encode_time3(p, &stat->atime);
196 lease_get_mtime(dentry->d_inode, &time);
197 p = encode_time3(p, &time);
198 p = encode_time3(p, &stat->ctime);
199
200 return p;
201 }
202
203 static __be32 *
204 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
205 {
206 struct inode *inode = fhp->fh_dentry->d_inode;
207
208 /* Attributes to follow */
209 *p++ = xdr_one;
210
211 *p++ = htonl(nfs3_ftypes[(fhp->fh_post_mode & S_IFMT) >> 12]);
212 *p++ = htonl((u32) fhp->fh_post_mode);
213 *p++ = htonl((u32) fhp->fh_post_nlink);
214 *p++ = htonl((u32) nfsd_ruid(rqstp, fhp->fh_post_uid));
215 *p++ = htonl((u32) nfsd_rgid(rqstp, fhp->fh_post_gid));
216 if (S_ISLNK(fhp->fh_post_mode) && fhp->fh_post_size > NFS3_MAXPATHLEN) {
217 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
218 } else {
219 p = xdr_encode_hyper(p, (u64) fhp->fh_post_size);
220 }
221 p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9);
222 *p++ = fhp->fh_post_rdev[0];
223 *p++ = fhp->fh_post_rdev[1];
224 p = encode_fsid(p, fhp);
225 p = xdr_encode_hyper(p, (u64) inode->i_ino);
226 p = encode_time3(p, &fhp->fh_post_atime);
227 p = encode_time3(p, &fhp->fh_post_mtime);
228 p = encode_time3(p, &fhp->fh_post_ctime);
229
230 return p;
231 }
232
233 /*
234 * Encode post-operation attributes.
235 * The inode may be NULL if the call failed because of a stale file
236 * handle. In this case, no attributes are returned.
237 */
238 static __be32 *
239 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
240 {
241 struct dentry *dentry = fhp->fh_dentry;
242 if (dentry && dentry->d_inode != NULL) {
243 int err;
244 struct kstat stat;
245
246 err = vfs_getattr(fhp->fh_export->ex_mnt, dentry, &stat);
247 if (!err) {
248 *p++ = xdr_one; /* attributes follow */
249 return encode_fattr3(rqstp, p, fhp, &stat);
250 }
251 }
252 *p++ = xdr_zero;
253 return p;
254 }
255
256 /* Helper for NFSv3 ACLs */
257 __be32 *
258 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
259 {
260 return encode_post_op_attr(rqstp, p, fhp);
261 }
262
263 /*
264 * Enocde weak cache consistency data
265 */
266 static __be32 *
267 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
268 {
269 struct dentry *dentry = fhp->fh_dentry;
270
271 if (dentry && dentry->d_inode && fhp->fh_post_saved) {
272 if (fhp->fh_pre_saved) {
273 *p++ = xdr_one;
274 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
275 p = encode_time3(p, &fhp->fh_pre_mtime);
276 p = encode_time3(p, &fhp->fh_pre_ctime);
277 } else {
278 *p++ = xdr_zero;
279 }
280 return encode_saved_post_attr(rqstp, p, fhp);
281 }
282 /* no pre- or post-attrs */
283 *p++ = xdr_zero;
284 return encode_post_op_attr(rqstp, p, fhp);
285 }
286
287
288 /*
289 * XDR decode functions
290 */
291 int
292 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
293 {
294 if (!(p = decode_fh(p, &args->fh)))
295 return 0;
296 return xdr_argsize_check(rqstp, p);
297 }
298
299 int
300 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
301 struct nfsd3_sattrargs *args)
302 {
303 if (!(p = decode_fh(p, &args->fh))
304 || !(p = decode_sattr3(p, &args->attrs)))
305 return 0;
306
307 if ((args->check_guard = ntohl(*p++)) != 0) {
308 struct timespec time;
309 p = decode_time3(p, &time);
310 args->guardtime = time.tv_sec;
311 }
312
313 return xdr_argsize_check(rqstp, p);
314 }
315
316 int
317 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
318 struct nfsd3_diropargs *args)
319 {
320 if (!(p = decode_fh(p, &args->fh))
321 || !(p = decode_filename(p, &args->name, &args->len)))
322 return 0;
323
324 return xdr_argsize_check(rqstp, p);
325 }
326
327 int
328 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
329 struct nfsd3_accessargs *args)
330 {
331 if (!(p = decode_fh(p, &args->fh)))
332 return 0;
333 args->access = ntohl(*p++);
334
335 return xdr_argsize_check(rqstp, p);
336 }
337
338 int
339 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
340 struct nfsd3_readargs *args)
341 {
342 unsigned int len;
343 int v,pn;
344 u32 max_blocksize = svc_max_payload(rqstp);
345
346 if (!(p = decode_fh(p, &args->fh))
347 || !(p = xdr_decode_hyper(p, &args->offset)))
348 return 0;
349
350 len = args->count = ntohl(*p++);
351
352 if (len > max_blocksize)
353 len = max_blocksize;
354
355 /* set up the kvec */
356 v=0;
357 while (len > 0) {
358 pn = rqstp->rq_resused++;
359 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
360 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
361 len -= rqstp->rq_vec[v].iov_len;
362 v++;
363 }
364 args->vlen = v;
365 return xdr_argsize_check(rqstp, p);
366 }
367
368 int
369 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
370 struct nfsd3_writeargs *args)
371 {
372 unsigned int len, v, hdr, dlen;
373 u32 max_blocksize = svc_max_payload(rqstp);
374
375 if (!(p = decode_fh(p, &args->fh))
376 || !(p = xdr_decode_hyper(p, &args->offset)))
377 return 0;
378
379 args->count = ntohl(*p++);
380 args->stable = ntohl(*p++);
381 len = args->len = ntohl(*p++);
382 /*
383 * The count must equal the amount of data passed.
384 */
385 if (args->count != args->len)
386 return 0;
387
388 /*
389 * Check to make sure that we got the right number of
390 * bytes.
391 *
392 * If more than one page was used, then compute the length
393 * of the data in the request as the total size of the
394 * request minus the transport protocol headers minus the
395 * RPC protocol headers minus the NFS protocol fields
396 * already consumed. If the request fits into a single
397 * page, then compete the length of the data as the size
398 * of the NFS portion of the request minus the NFS
399 * protocol fields already consumed.
400 */
401 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
402 if (rqstp->rq_respages != rqstp->rq_pages + 1) {
403 dlen = rqstp->rq_arg.len -
404 (PAGE_SIZE - rqstp->rq_arg.head[0].iov_len) - hdr;
405 } else {
406 dlen = rqstp->rq_arg.head[0].iov_len - hdr;
407 }
408 /*
409 * Round the length of the data which was specified up to
410 * the next multiple of XDR units and then compare that
411 * against the length which was actually received.
412 */
413 if (dlen != ((len + 3) & ~0x3))
414 return 0;
415
416 if (args->count > max_blocksize) {
417 args->count = max_blocksize;
418 len = args->len = max_blocksize;
419 }
420 rqstp->rq_vec[0].iov_base = (void*)p;
421 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
422 v = 0;
423 while (len > rqstp->rq_vec[v].iov_len) {
424 len -= rqstp->rq_vec[v].iov_len;
425 v++;
426 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
427 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
428 }
429 rqstp->rq_vec[v].iov_len = len;
430 args->vlen = v + 1;
431 return 1;
432 }
433
434 int
435 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
436 struct nfsd3_createargs *args)
437 {
438 if (!(p = decode_fh(p, &args->fh))
439 || !(p = decode_filename(p, &args->name, &args->len)))
440 return 0;
441
442 switch (args->createmode = ntohl(*p++)) {
443 case NFS3_CREATE_UNCHECKED:
444 case NFS3_CREATE_GUARDED:
445 if (!(p = decode_sattr3(p, &args->attrs)))
446 return 0;
447 break;
448 case NFS3_CREATE_EXCLUSIVE:
449 args->verf = p;
450 p += 2;
451 break;
452 default:
453 return 0;
454 }
455
456 return xdr_argsize_check(rqstp, p);
457 }
458 int
459 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
460 struct nfsd3_createargs *args)
461 {
462 if (!(p = decode_fh(p, &args->fh))
463 || !(p = decode_filename(p, &args->name, &args->len))
464 || !(p = decode_sattr3(p, &args->attrs)))
465 return 0;
466
467 return xdr_argsize_check(rqstp, p);
468 }
469
470 int
471 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
472 struct nfsd3_symlinkargs *args)
473 {
474 unsigned int len;
475 int avail;
476 char *old, *new;
477 struct kvec *vec;
478
479 if (!(p = decode_fh(p, &args->ffh))
480 || !(p = decode_filename(p, &args->fname, &args->flen))
481 || !(p = decode_sattr3(p, &args->attrs))
482 )
483 return 0;
484 /* now decode the pathname, which might be larger than the first page.
485 * As we have to check for nul's anyway, we copy it into a new page
486 * This page appears in the rq_res.pages list, but as pages_len is always
487 * 0, it won't get in the way
488 */
489 len = ntohl(*p++);
490 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
491 return 0;
492 args->tname = new =
493 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
494 args->tlen = len;
495 /* first copy and check from the first page */
496 old = (char*)p;
497 vec = &rqstp->rq_arg.head[0];
498 avail = vec->iov_len - (old - (char*)vec->iov_base);
499 while (len && avail && *old) {
500 *new++ = *old++;
501 len--;
502 avail--;
503 }
504 /* now copy next page if there is one */
505 if (len && !avail && rqstp->rq_arg.page_len) {
506 avail = rqstp->rq_arg.page_len;
507 if (avail > PAGE_SIZE) avail = PAGE_SIZE;
508 old = page_address(rqstp->rq_arg.pages[0]);
509 }
510 while (len && avail && *old) {
511 *new++ = *old++;
512 len--;
513 avail--;
514 }
515 *new = '\0';
516 if (len)
517 return 0;
518
519 return 1;
520 }
521
522 int
523 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
524 struct nfsd3_mknodargs *args)
525 {
526 if (!(p = decode_fh(p, &args->fh))
527 || !(p = decode_filename(p, &args->name, &args->len)))
528 return 0;
529
530 args->ftype = ntohl(*p++);
531
532 if (args->ftype == NF3BLK || args->ftype == NF3CHR
533 || args->ftype == NF3SOCK || args->ftype == NF3FIFO) {
534 if (!(p = decode_sattr3(p, &args->attrs)))
535 return 0;
536 }
537
538 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
539 args->major = ntohl(*p++);
540 args->minor = ntohl(*p++);
541 }
542
543 return xdr_argsize_check(rqstp, p);
544 }
545
546 int
547 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
548 struct nfsd3_renameargs *args)
549 {
550 if (!(p = decode_fh(p, &args->ffh))
551 || !(p = decode_filename(p, &args->fname, &args->flen))
552 || !(p = decode_fh(p, &args->tfh))
553 || !(p = decode_filename(p, &args->tname, &args->tlen)))
554 return 0;
555
556 return xdr_argsize_check(rqstp, p);
557 }
558
559 int
560 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
561 struct nfsd3_readlinkargs *args)
562 {
563 if (!(p = decode_fh(p, &args->fh)))
564 return 0;
565 args->buffer =
566 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
567
568 return xdr_argsize_check(rqstp, p);
569 }
570
571 int
572 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
573 struct nfsd3_linkargs *args)
574 {
575 if (!(p = decode_fh(p, &args->ffh))
576 || !(p = decode_fh(p, &args->tfh))
577 || !(p = decode_filename(p, &args->tname, &args->tlen)))
578 return 0;
579
580 return xdr_argsize_check(rqstp, p);
581 }
582
583 int
584 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
585 struct nfsd3_readdirargs *args)
586 {
587 if (!(p = decode_fh(p, &args->fh)))
588 return 0;
589 p = xdr_decode_hyper(p, &args->cookie);
590 args->verf = p; p += 2;
591 args->dircount = ~0;
592 args->count = ntohl(*p++);
593
594 if (args->count > PAGE_SIZE)
595 args->count = PAGE_SIZE;
596
597 args->buffer =
598 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
599
600 return xdr_argsize_check(rqstp, p);
601 }
602
603 int
604 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
605 struct nfsd3_readdirargs *args)
606 {
607 int len, pn;
608 u32 max_blocksize = svc_max_payload(rqstp);
609
610 if (!(p = decode_fh(p, &args->fh)))
611 return 0;
612 p = xdr_decode_hyper(p, &args->cookie);
613 args->verf = p; p += 2;
614 args->dircount = ntohl(*p++);
615 args->count = ntohl(*p++);
616
617 len = (args->count > max_blocksize) ? max_blocksize :
618 args->count;
619 args->count = len;
620
621 while (len > 0) {
622 pn = rqstp->rq_resused++;
623 if (!args->buffer)
624 args->buffer = page_address(rqstp->rq_respages[pn]);
625 len -= PAGE_SIZE;
626 }
627
628 return xdr_argsize_check(rqstp, p);
629 }
630
631 int
632 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
633 struct nfsd3_commitargs *args)
634 {
635 if (!(p = decode_fh(p, &args->fh)))
636 return 0;
637 p = xdr_decode_hyper(p, &args->offset);
638 args->count = ntohl(*p++);
639
640 return xdr_argsize_check(rqstp, p);
641 }
642
643 /*
644 * XDR encode functions
645 */
646 /*
647 * There must be an encoding function for void results so svc_process
648 * will work properly.
649 */
650 int
651 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
652 {
653 return xdr_ressize_check(rqstp, p);
654 }
655
656 /* GETATTR */
657 int
658 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
659 struct nfsd3_attrstat *resp)
660 {
661 if (resp->status == 0)
662 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
663 return xdr_ressize_check(rqstp, p);
664 }
665
666 /* SETATTR, REMOVE, RMDIR */
667 int
668 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
669 struct nfsd3_attrstat *resp)
670 {
671 p = encode_wcc_data(rqstp, p, &resp->fh);
672 return xdr_ressize_check(rqstp, p);
673 }
674
675 /* LOOKUP */
676 int
677 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
678 struct nfsd3_diropres *resp)
679 {
680 if (resp->status == 0) {
681 p = encode_fh(p, &resp->fh);
682 p = encode_post_op_attr(rqstp, p, &resp->fh);
683 }
684 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
685 return xdr_ressize_check(rqstp, p);
686 }
687
688 /* ACCESS */
689 int
690 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
691 struct nfsd3_accessres *resp)
692 {
693 p = encode_post_op_attr(rqstp, p, &resp->fh);
694 if (resp->status == 0)
695 *p++ = htonl(resp->access);
696 return xdr_ressize_check(rqstp, p);
697 }
698
699 /* READLINK */
700 int
701 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
702 struct nfsd3_readlinkres *resp)
703 {
704 p = encode_post_op_attr(rqstp, p, &resp->fh);
705 if (resp->status == 0) {
706 *p++ = htonl(resp->len);
707 xdr_ressize_check(rqstp, p);
708 rqstp->rq_res.page_len = resp->len;
709 if (resp->len & 3) {
710 /* need to pad the tail */
711 rqstp->rq_res.tail[0].iov_base = p;
712 *p = 0;
713 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
714 }
715 return 1;
716 } else
717 return xdr_ressize_check(rqstp, p);
718 }
719
720 /* READ */
721 int
722 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
723 struct nfsd3_readres *resp)
724 {
725 p = encode_post_op_attr(rqstp, p, &resp->fh);
726 if (resp->status == 0) {
727 *p++ = htonl(resp->count);
728 *p++ = htonl(resp->eof);
729 *p++ = htonl(resp->count); /* xdr opaque count */
730 xdr_ressize_check(rqstp, p);
731 /* now update rqstp->rq_res to reflect data aswell */
732 rqstp->rq_res.page_len = resp->count;
733 if (resp->count & 3) {
734 /* need to pad the tail */
735 rqstp->rq_res.tail[0].iov_base = p;
736 *p = 0;
737 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
738 }
739 return 1;
740 } else
741 return xdr_ressize_check(rqstp, p);
742 }
743
744 /* WRITE */
745 int
746 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
747 struct nfsd3_writeres *resp)
748 {
749 p = encode_wcc_data(rqstp, p, &resp->fh);
750 if (resp->status == 0) {
751 *p++ = htonl(resp->count);
752 *p++ = htonl(resp->committed);
753 *p++ = htonl(nfssvc_boot.tv_sec);
754 *p++ = htonl(nfssvc_boot.tv_usec);
755 }
756 return xdr_ressize_check(rqstp, p);
757 }
758
759 /* CREATE, MKDIR, SYMLINK, MKNOD */
760 int
761 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
762 struct nfsd3_diropres *resp)
763 {
764 if (resp->status == 0) {
765 *p++ = xdr_one;
766 p = encode_fh(p, &resp->fh);
767 p = encode_post_op_attr(rqstp, p, &resp->fh);
768 }
769 p = encode_wcc_data(rqstp, p, &resp->dirfh);
770 return xdr_ressize_check(rqstp, p);
771 }
772
773 /* RENAME */
774 int
775 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
776 struct nfsd3_renameres *resp)
777 {
778 p = encode_wcc_data(rqstp, p, &resp->ffh);
779 p = encode_wcc_data(rqstp, p, &resp->tfh);
780 return xdr_ressize_check(rqstp, p);
781 }
782
783 /* LINK */
784 int
785 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
786 struct nfsd3_linkres *resp)
787 {
788 p = encode_post_op_attr(rqstp, p, &resp->fh);
789 p = encode_wcc_data(rqstp, p, &resp->tfh);
790 return xdr_ressize_check(rqstp, p);
791 }
792
793 /* READDIR */
794 int
795 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
796 struct nfsd3_readdirres *resp)
797 {
798 p = encode_post_op_attr(rqstp, p, &resp->fh);
799
800 if (resp->status == 0) {
801 /* stupid readdir cookie */
802 memcpy(p, resp->verf, 8); p += 2;
803 xdr_ressize_check(rqstp, p);
804 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
805 return 1; /*No room for trailer */
806 rqstp->rq_res.page_len = (resp->count) << 2;
807
808 /* add the 'tail' to the end of the 'head' page - page 0. */
809 rqstp->rq_res.tail[0].iov_base = p;
810 *p++ = 0; /* no more entries */
811 *p++ = htonl(resp->common.err == nfserr_eof);
812 rqstp->rq_res.tail[0].iov_len = 2<<2;
813 return 1;
814 } else
815 return xdr_ressize_check(rqstp, p);
816 }
817
818 static __be32 *
819 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
820 int namlen, ino_t ino)
821 {
822 *p++ = xdr_one; /* mark entry present */
823 p = xdr_encode_hyper(p, ino); /* file id */
824 p = xdr_encode_array(p, name, namlen);/* name length & name */
825
826 cd->offset = p; /* remember pointer */
827 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
828
829 return p;
830 }
831
832 static __be32 *
833 encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p,
834 struct svc_fh *fhp)
835 {
836 p = encode_post_op_attr(cd->rqstp, p, fhp);
837 *p++ = xdr_one; /* yes, a file handle follows */
838 p = encode_fh(p, fhp);
839 fh_put(fhp);
840 return p;
841 }
842
843 static int
844 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
845 const char *name, int namlen)
846 {
847 struct svc_export *exp;
848 struct dentry *dparent, *dchild;
849 int rv = 0;
850
851 dparent = cd->fh.fh_dentry;
852 exp = cd->fh.fh_export;
853
854 fh_init(fhp, NFS3_FHSIZE);
855 if (isdotent(name, namlen)) {
856 if (namlen == 2) {
857 dchild = dget_parent(dparent);
858 if (dchild == dparent) {
859 /* filesystem root - cannot return filehandle for ".." */
860 dput(dchild);
861 return 1;
862 }
863 } else
864 dchild = dget(dparent);
865 } else
866 dchild = lookup_one_len(name, dparent, namlen);
867 if (IS_ERR(dchild))
868 return 1;
869 if (d_mountpoint(dchild) ||
870 fh_compose(fhp, exp, dchild, &cd->fh) != 0 ||
871 !dchild->d_inode)
872 rv = 1;
873 dput(dchild);
874 return rv;
875 }
876
877 /*
878 * Encode a directory entry. This one works for both normal readdir
879 * and readdirplus.
880 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
881 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
882 *
883 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
884 * file handle.
885 */
886
887 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
888 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
889 static int
890 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
891 loff_t offset, ino_t ino, unsigned int d_type, int plus)
892 {
893 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
894 common);
895 __be32 *p = cd->buffer;
896 caddr_t curr_page_addr = NULL;
897 int pn; /* current page number */
898 int slen; /* string (name) length */
899 int elen; /* estimated entry length in words */
900 int num_entry_words = 0; /* actual number of words */
901
902 if (cd->offset) {
903 u64 offset64 = offset;
904
905 if (unlikely(cd->offset1)) {
906 /* we ended up with offset on a page boundary */
907 *cd->offset = htonl(offset64 >> 32);
908 *cd->offset1 = htonl(offset64 & 0xffffffff);
909 cd->offset1 = NULL;
910 } else {
911 xdr_encode_hyper(cd->offset, offset64);
912 }
913 }
914
915 /*
916 dprintk("encode_entry(%.*s @%ld%s)\n",
917 namlen, name, (long) offset, plus? " plus" : "");
918 */
919
920 /* truncate filename if too long */
921 if (namlen > NFS3_MAXNAMLEN)
922 namlen = NFS3_MAXNAMLEN;
923
924 slen = XDR_QUADLEN(namlen);
925 elen = slen + NFS3_ENTRY_BAGGAGE
926 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
927
928 if (cd->buflen < elen) {
929 cd->common.err = nfserr_toosmall;
930 return -EINVAL;
931 }
932
933 /* determine which page in rq_respages[] we are currently filling */
934 for (pn=1; pn < cd->rqstp->rq_resused; pn++) {
935 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
936
937 if (((caddr_t)cd->buffer >= curr_page_addr) &&
938 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
939 break;
940 }
941
942 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
943 /* encode entry in current page */
944
945 p = encode_entry_baggage(cd, p, name, namlen, ino);
946
947 /* throw in readdirplus baggage */
948 if (plus) {
949 struct svc_fh fh;
950
951 if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
952 *p++ = 0;
953 *p++ = 0;
954 } else
955 p = encode_entryplus_baggage(cd, p, &fh);
956 }
957 num_entry_words = p - cd->buffer;
958 } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
959 /* temporarily encode entry into next page, then move back to
960 * current and next page in rq_respages[] */
961 __be32 *p1, *tmp;
962 int len1, len2;
963
964 /* grab next page for temporary storage of entry */
965 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
966
967 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
968
969 /* throw in readdirplus baggage */
970 if (plus) {
971 struct svc_fh fh;
972
973 if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
974 /* zero out the filehandle */
975 *p1++ = 0;
976 *p1++ = 0;
977 } else
978 p1 = encode_entryplus_baggage(cd, p1, &fh);
979 }
980
981 /* determine entry word length and lengths to go in pages */
982 num_entry_words = p1 - tmp;
983 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
984 if ((num_entry_words << 2) < len1) {
985 /* the actual number of words in the entry is less
986 * than elen and can still fit in the current page
987 */
988 memmove(p, tmp, num_entry_words << 2);
989 p += num_entry_words;
990
991 /* update offset */
992 cd->offset = cd->buffer + (cd->offset - tmp);
993 } else {
994 unsigned int offset_r = (cd->offset - tmp) << 2;
995
996 /* update pointer to offset location.
997 * This is a 64bit quantity, so we need to
998 * deal with 3 cases:
999 * - entirely in first page
1000 * - entirely in second page
1001 * - 4 bytes in each page
1002 */
1003 if (offset_r + 8 <= len1) {
1004 cd->offset = p + (cd->offset - tmp);
1005 } else if (offset_r >= len1) {
1006 cd->offset -= len1 >> 2;
1007 } else {
1008 /* sitting on the fence */
1009 BUG_ON(offset_r != len1 - 4);
1010 cd->offset = p + (cd->offset - tmp);
1011 cd->offset1 = tmp;
1012 }
1013
1014 len2 = (num_entry_words << 2) - len1;
1015
1016 /* move from temp page to current and next pages */
1017 memmove(p, tmp, len1);
1018 memmove(tmp, (caddr_t)tmp+len1, len2);
1019
1020 p = tmp + (len2 >> 2);
1021 }
1022 }
1023 else {
1024 cd->common.err = nfserr_toosmall;
1025 return -EINVAL;
1026 }
1027
1028 cd->buflen -= num_entry_words;
1029 cd->buffer = p;
1030 cd->common.err = nfs_ok;
1031 return 0;
1032
1033 }
1034
1035 int
1036 nfs3svc_encode_entry(void *cd, const char *name,
1037 int namlen, loff_t offset, u64 ino, unsigned int d_type)
1038 {
1039 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1040 }
1041
1042 int
1043 nfs3svc_encode_entry_plus(void *cd, const char *name,
1044 int namlen, loff_t offset, u64 ino,
1045 unsigned int d_type)
1046 {
1047 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1048 }
1049
1050 /* FSSTAT */
1051 int
1052 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1053 struct nfsd3_fsstatres *resp)
1054 {
1055 struct kstatfs *s = &resp->stats;
1056 u64 bs = s->f_bsize;
1057
1058 *p++ = xdr_zero; /* no post_op_attr */
1059
1060 if (resp->status == 0) {
1061 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1062 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1063 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1064 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1065 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1066 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1067 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1068 }
1069 return xdr_ressize_check(rqstp, p);
1070 }
1071
1072 /* FSINFO */
1073 int
1074 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1075 struct nfsd3_fsinfores *resp)
1076 {
1077 *p++ = xdr_zero; /* no post_op_attr */
1078
1079 if (resp->status == 0) {
1080 *p++ = htonl(resp->f_rtmax);
1081 *p++ = htonl(resp->f_rtpref);
1082 *p++ = htonl(resp->f_rtmult);
1083 *p++ = htonl(resp->f_wtmax);
1084 *p++ = htonl(resp->f_wtpref);
1085 *p++ = htonl(resp->f_wtmult);
1086 *p++ = htonl(resp->f_dtpref);
1087 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1088 *p++ = xdr_one;
1089 *p++ = xdr_zero;
1090 *p++ = htonl(resp->f_properties);
1091 }
1092
1093 return xdr_ressize_check(rqstp, p);
1094 }
1095
1096 /* PATHCONF */
1097 int
1098 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1099 struct nfsd3_pathconfres *resp)
1100 {
1101 *p++ = xdr_zero; /* no post_op_attr */
1102
1103 if (resp->status == 0) {
1104 *p++ = htonl(resp->p_link_max);
1105 *p++ = htonl(resp->p_name_max);
1106 *p++ = htonl(resp->p_no_trunc);
1107 *p++ = htonl(resp->p_chown_restricted);
1108 *p++ = htonl(resp->p_case_insensitive);
1109 *p++ = htonl(resp->p_case_preserving);
1110 }
1111
1112 return xdr_ressize_check(rqstp, p);
1113 }
1114
1115 /* COMMIT */
1116 int
1117 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1118 struct nfsd3_commitres *resp)
1119 {
1120 p = encode_wcc_data(rqstp, p, &resp->fh);
1121 /* Write verifier */
1122 if (resp->status == 0) {
1123 *p++ = htonl(nfssvc_boot.tv_sec);
1124 *p++ = htonl(nfssvc_boot.tv_usec);
1125 }
1126 return xdr_ressize_check(rqstp, p);
1127 }
1128
1129 /*
1130 * XDR release functions
1131 */
1132 int
1133 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1134 struct nfsd3_attrstat *resp)
1135 {
1136 fh_put(&resp->fh);
1137 return 1;
1138 }
1139
1140 int
1141 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
1142 struct nfsd3_fhandle_pair *resp)
1143 {
1144 fh_put(&resp->fh1);
1145 fh_put(&resp->fh2);
1146 return 1;
1147 }
Linus' kernel tree