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[PATCH] w1: Added w1_reset_select_slave() - Resets the bus and then selects the slave by
[linux-2.6/verdex.git] / fs / nfsd / nfs3xdr.c
blobe0e134d6baba0013af5918f0dd0a4f9c3405b246
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 #ifdef NFSD_OPTIMIZE_SPACE
28 # define inline
29 #endif
30
31
32 /*
33 * Mapping of S_IF* types to NFS file types
34 */
35 static u32 nfs3_ftypes[] = {
36 NF3NON, NF3FIFO, NF3CHR, NF3BAD,
37 NF3DIR, NF3BAD, NF3BLK, NF3BAD,
38 NF3REG, NF3BAD, NF3LNK, NF3BAD,
39 NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
40 };
41
42 /*
43 * XDR functions for basic NFS types
44 */
45 static inline u32 *
46 encode_time3(u32 *p, struct timespec *time)
47 {
48 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
49 return p;
50 }
51
52 static inline u32 *
53 decode_time3(u32 *p, struct timespec *time)
54 {
55 time->tv_sec = ntohl(*p++);
56 time->tv_nsec = ntohl(*p++);
57 return p;
58 }
59
60 static inline u32 *
61 decode_fh(u32 *p, struct svc_fh *fhp)
62 {
63 unsigned int size;
64 fh_init(fhp, NFS3_FHSIZE);
65 size = ntohl(*p++);
66 if (size > NFS3_FHSIZE)
67 return NULL;
68
69 memcpy(&fhp->fh_handle.fh_base, p, size);
70 fhp->fh_handle.fh_size = size;
71 return p + XDR_QUADLEN(size);
72 }
73
74 /* Helper function for NFSv3 ACL code */
75 u32 *nfs3svc_decode_fh(u32 *p, struct svc_fh *fhp)
76 {
77 return decode_fh(p, fhp);
78 }
79
80 static inline u32 *
81 encode_fh(u32 *p, struct svc_fh *fhp)
82 {
83 unsigned int size = fhp->fh_handle.fh_size;
84 *p++ = htonl(size);
85 if (size) p[XDR_QUADLEN(size)-1]=0;
86 memcpy(p, &fhp->fh_handle.fh_base, size);
87 return p + XDR_QUADLEN(size);
88 }
89
90 /*
91 * Decode a file name and make sure that the path contains
92 * no slashes or null bytes.
93 */
94 static inline u32 *
95 decode_filename(u32 *p, char **namp, int *lenp)
96 {
97 char *name;
98 int i;
99
100 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
101 for (i = 0, name = *namp; i < *lenp; i++, name++) {
102 if (*name == '\0' || *name == '/')
103 return NULL;
104 }
105 }
106
107 return p;
108 }
109
110 static inline u32 *
111 decode_sattr3(u32 *p, struct iattr *iap)
112 {
113 u32 tmp;
114
115 iap->ia_valid = 0;
116
117 if (*p++) {
118 iap->ia_valid |= ATTR_MODE;
119 iap->ia_mode = ntohl(*p++);
120 }
121 if (*p++) {
122 iap->ia_valid |= ATTR_UID;
123 iap->ia_uid = ntohl(*p++);
124 }
125 if (*p++) {
126 iap->ia_valid |= ATTR_GID;
127 iap->ia_gid = ntohl(*p++);
128 }
129 if (*p++) {
130 u64 newsize;
131
132 iap->ia_valid |= ATTR_SIZE;
133 p = xdr_decode_hyper(p, &newsize);
134 if (newsize <= NFS_OFFSET_MAX)
135 iap->ia_size = newsize;
136 else
137 iap->ia_size = NFS_OFFSET_MAX;
138 }
139 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
140 iap->ia_valid |= ATTR_ATIME;
141 } else if (tmp == 2) { /* set to client time */
142 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
143 iap->ia_atime.tv_sec = ntohl(*p++);
144 iap->ia_atime.tv_nsec = ntohl(*p++);
145 }
146 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
147 iap->ia_valid |= ATTR_MTIME;
148 } else if (tmp == 2) { /* set to client time */
149 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
150 iap->ia_mtime.tv_sec = ntohl(*p++);
151 iap->ia_mtime.tv_nsec = ntohl(*p++);
152 }
153 return p;
154 }
155
156 static inline u32 *
157 encode_fattr3(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
158 {
159 struct vfsmount *mnt = fhp->fh_export->ex_mnt;
160 struct dentry *dentry = fhp->fh_dentry;
161 struct kstat stat;
162 struct timespec time;
163
164 vfs_getattr(mnt, dentry, &stat);
165
166 *p++ = htonl(nfs3_ftypes[(stat.mode & S_IFMT) >> 12]);
167 *p++ = htonl((u32) stat.mode);
168 *p++ = htonl((u32) stat.nlink);
169 *p++ = htonl((u32) nfsd_ruid(rqstp, stat.uid));
170 *p++ = htonl((u32) nfsd_rgid(rqstp, stat.gid));
171 if (S_ISLNK(stat.mode) && stat.size > NFS3_MAXPATHLEN) {
172 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
173 } else {
174 p = xdr_encode_hyper(p, (u64) stat.size);
175 }
176 p = xdr_encode_hyper(p, ((u64)stat.blocks) << 9);
177 *p++ = htonl((u32) MAJOR(stat.rdev));
178 *p++ = htonl((u32) MINOR(stat.rdev));
179 if (is_fsid(fhp, rqstp->rq_reffh))
180 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
181 else
182 p = xdr_encode_hyper(p, (u64) huge_encode_dev(stat.dev));
183 p = xdr_encode_hyper(p, (u64) stat.ino);
184 p = encode_time3(p, &stat.atime);
185 lease_get_mtime(dentry->d_inode, &time);
186 p = encode_time3(p, &time);
187 p = encode_time3(p, &stat.ctime);
188
189 return p;
190 }
191
192 static inline u32 *
193 encode_saved_post_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
194 {
195 struct inode *inode = fhp->fh_dentry->d_inode;
196
197 /* Attributes to follow */
198 *p++ = xdr_one;
199
200 *p++ = htonl(nfs3_ftypes[(fhp->fh_post_mode & S_IFMT) >> 12]);
201 *p++ = htonl((u32) fhp->fh_post_mode);
202 *p++ = htonl((u32) fhp->fh_post_nlink);
203 *p++ = htonl((u32) nfsd_ruid(rqstp, fhp->fh_post_uid));
204 *p++ = htonl((u32) nfsd_rgid(rqstp, fhp->fh_post_gid));
205 if (S_ISLNK(fhp->fh_post_mode) && fhp->fh_post_size > NFS3_MAXPATHLEN) {
206 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
207 } else {
208 p = xdr_encode_hyper(p, (u64) fhp->fh_post_size);
209 }
210 p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9);
211 *p++ = fhp->fh_post_rdev[0];
212 *p++ = fhp->fh_post_rdev[1];
213 if (is_fsid(fhp, rqstp->rq_reffh))
214 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
215 else
216 p = xdr_encode_hyper(p, (u64)huge_encode_dev(inode->i_sb->s_dev));
217 p = xdr_encode_hyper(p, (u64) inode->i_ino);
218 p = encode_time3(p, &fhp->fh_post_atime);
219 p = encode_time3(p, &fhp->fh_post_mtime);
220 p = encode_time3(p, &fhp->fh_post_ctime);
221
222 return p;
223 }
224
225 /*
226 * Encode post-operation attributes.
227 * The inode may be NULL if the call failed because of a stale file
228 * handle. In this case, no attributes are returned.
229 */
230 static u32 *
231 encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
232 {
233 struct dentry *dentry = fhp->fh_dentry;
234 if (dentry && dentry->d_inode != NULL) {
235 *p++ = xdr_one; /* attributes follow */
236 return encode_fattr3(rqstp, p, fhp);
237 }
238 *p++ = xdr_zero;
239 return p;
240 }
241
242 /* Helper for NFSv3 ACLs */
243 u32 *
244 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
245 {
246 return encode_post_op_attr(rqstp, p, fhp);
247 }
248
249 /*
250 * Enocde weak cache consistency data
251 */
252 static u32 *
253 encode_wcc_data(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
254 {
255 struct dentry *dentry = fhp->fh_dentry;
256
257 if (dentry && dentry->d_inode && fhp->fh_post_saved) {
258 if (fhp->fh_pre_saved) {
259 *p++ = xdr_one;
260 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
261 p = encode_time3(p, &fhp->fh_pre_mtime);
262 p = encode_time3(p, &fhp->fh_pre_ctime);
263 } else {
264 *p++ = xdr_zero;
265 }
266 return encode_saved_post_attr(rqstp, p, fhp);
267 }
268 /* no pre- or post-attrs */
269 *p++ = xdr_zero;
270 return encode_post_op_attr(rqstp, p, fhp);
271 }
272
273
274 /*
275 * XDR decode functions
276 */
277 int
278 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct nfsd_fhandle *args)
279 {
280 if (!(p = decode_fh(p, &args->fh)))
281 return 0;
282 return xdr_argsize_check(rqstp, p);
283 }
284
285 int
286 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p,
287 struct nfsd3_sattrargs *args)
288 {
289 if (!(p = decode_fh(p, &args->fh))
290 || !(p = decode_sattr3(p, &args->attrs)))
291 return 0;
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
302 int
303 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, u32 *p,
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
313 int
314 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, u32 *p,
315 struct nfsd3_accessargs *args)
316 {
317 if (!(p = decode_fh(p, &args->fh)))
318 return 0;
319 args->access = ntohl(*p++);
320
321 return xdr_argsize_check(rqstp, p);
322 }
323
324 int
325 nfs3svc_decode_readargs(struct svc_rqst *rqstp, u32 *p,
326 struct nfsd3_readargs *args)
327 {
328 unsigned int len;
329 int v,pn;
330
331 if (!(p = decode_fh(p, &args->fh))
332 || !(p = xdr_decode_hyper(p, &args->offset)))
333 return 0;
334
335 len = args->count = ntohl(*p++);
336
337 if (len > NFSSVC_MAXBLKSIZE)
338 len = NFSSVC_MAXBLKSIZE;
339
340 /* set up the kvec */
341 v=0;
342 while (len > 0) {
343 pn = rqstp->rq_resused;
344 svc_take_page(rqstp);
345 args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
346 args->vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
347 len -= args->vec[v].iov_len;
348 v++;
349 }
350 args->vlen = v;
351 return xdr_argsize_check(rqstp, p);
352 }
353
354 int
355 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, u32 *p,
356 struct nfsd3_writeargs *args)
357 {
358 unsigned int len, v, hdr;
359
360 if (!(p = decode_fh(p, &args->fh))
361 || !(p = xdr_decode_hyper(p, &args->offset)))
362 return 0;
363
364 args->count = ntohl(*p++);
365 args->stable = ntohl(*p++);
366 len = args->len = ntohl(*p++);
367
368 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
369 if (rqstp->rq_arg.len < len + hdr)
370 return 0;
371
372 args->vec[0].iov_base = (void*)p;
373 args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
374
375 if (len > NFSSVC_MAXBLKSIZE)
376 len = NFSSVC_MAXBLKSIZE;
377 v= 0;
378 while (len > args->vec[v].iov_len) {
379 len -= args->vec[v].iov_len;
380 v++;
381 args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]);
382 args->vec[v].iov_len = PAGE_SIZE;
383 }
384 args->vec[v].iov_len = len;
385 args->vlen = v+1;
386
387 return args->count == args->len && args->vec[0].iov_len > 0;
388 }
389
390 int
391 nfs3svc_decode_createargs(struct svc_rqst *rqstp, u32 *p,
392 struct nfsd3_createargs *args)
393 {
394 if (!(p = decode_fh(p, &args->fh))
395 || !(p = decode_filename(p, &args->name, &args->len)))
396 return 0;
397
398 switch (args->createmode = ntohl(*p++)) {
399 case NFS3_CREATE_UNCHECKED:
400 case NFS3_CREATE_GUARDED:
401 if (!(p = decode_sattr3(p, &args->attrs)))
402 return 0;
403 break;
404 case NFS3_CREATE_EXCLUSIVE:
405 args->verf = p;
406 p += 2;
407 break;
408 default:
409 return 0;
410 }
411
412 return xdr_argsize_check(rqstp, p);
413 }
414 int
415 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, u32 *p,
416 struct nfsd3_createargs *args)
417 {
418 if (!(p = decode_fh(p, &args->fh))
419 || !(p = decode_filename(p, &args->name, &args->len))
420 || !(p = decode_sattr3(p, &args->attrs)))
421 return 0;
422
423 return xdr_argsize_check(rqstp, p);
424 }
425
426 int
427 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p,
428 struct nfsd3_symlinkargs *args)
429 {
430 unsigned int len;
431 int avail;
432 char *old, *new;
433 struct kvec *vec;
434
435 if (!(p = decode_fh(p, &args->ffh))
436 || !(p = decode_filename(p, &args->fname, &args->flen))
437 || !(p = decode_sattr3(p, &args->attrs))
438 )
439 return 0;
440 /* now decode the pathname, which might be larger than the first page.
441 * As we have to check for nul's anyway, we copy it into a new page
442 * This page appears in the rq_res.pages list, but as pages_len is always
443 * 0, it won't get in the way
444 */
445 svc_take_page(rqstp);
446 len = ntohl(*p++);
447 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
448 return 0;
449 args->tname = new = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
450 args->tlen = len;
451 /* first copy and check from the first page */
452 old = (char*)p;
453 vec = &rqstp->rq_arg.head[0];
454 avail = vec->iov_len - (old - (char*)vec->iov_base);
455 while (len && avail && *old) {
456 *new++ = *old++;
457 len--;
458 avail--;
459 }
460 /* now copy next page if there is one */
461 if (len && !avail && rqstp->rq_arg.page_len) {
462 avail = rqstp->rq_arg.page_len;
463 if (avail > PAGE_SIZE) avail = PAGE_SIZE;
464 old = page_address(rqstp->rq_arg.pages[0]);
465 }
466 while (len && avail && *old) {
467 *new++ = *old++;
468 len--;
469 avail--;
470 }
471 *new = '\0';
472 if (len)
473 return 0;
474
475 return 1;
476 }
477
478 int
479 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, u32 *p,
480 struct nfsd3_mknodargs *args)
481 {
482 if (!(p = decode_fh(p, &args->fh))
483 || !(p = decode_filename(p, &args->name, &args->len)))
484 return 0;
485
486 args->ftype = ntohl(*p++);
487
488 if (args->ftype == NF3BLK || args->ftype == NF3CHR
489 || args->ftype == NF3SOCK || args->ftype == NF3FIFO) {
490 if (!(p = decode_sattr3(p, &args->attrs)))
491 return 0;
492 }
493
494 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
495 args->major = ntohl(*p++);
496 args->minor = ntohl(*p++);
497 }
498
499 return xdr_argsize_check(rqstp, p);
500 }
501
502 int
503 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, u32 *p,
504 struct nfsd3_renameargs *args)
505 {
506 if (!(p = decode_fh(p, &args->ffh))
507 || !(p = decode_filename(p, &args->fname, &args->flen))
508 || !(p = decode_fh(p, &args->tfh))
509 || !(p = decode_filename(p, &args->tname, &args->tlen)))
510 return 0;
511
512 return xdr_argsize_check(rqstp, p);
513 }
514
515 int
516 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p,
517 struct nfsd3_readlinkargs *args)
518 {
519 if (!(p = decode_fh(p, &args->fh)))
520 return 0;
521 svc_take_page(rqstp);
522 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
523
524 return xdr_argsize_check(rqstp, p);
525 }
526
527 int
528 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, u32 *p,
529 struct nfsd3_linkargs *args)
530 {
531 if (!(p = decode_fh(p, &args->ffh))
532 || !(p = decode_fh(p, &args->tfh))
533 || !(p = decode_filename(p, &args->tname, &args->tlen)))
534 return 0;
535
536 return xdr_argsize_check(rqstp, p);
537 }
538
539 int
540 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p,
541 struct nfsd3_readdirargs *args)
542 {
543 if (!(p = decode_fh(p, &args->fh)))
544 return 0;
545 p = xdr_decode_hyper(p, &args->cookie);
546 args->verf = p; p += 2;
547 args->dircount = ~0;
548 args->count = ntohl(*p++);
549
550 if (args->count > PAGE_SIZE)
551 args->count = PAGE_SIZE;
552
553 svc_take_page(rqstp);
554 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
555
556 return xdr_argsize_check(rqstp, p);
557 }
558
559 int
560 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p,
561 struct nfsd3_readdirargs *args)
562 {
563 int len, pn;
564
565 if (!(p = decode_fh(p, &args->fh)))
566 return 0;
567 p = xdr_decode_hyper(p, &args->cookie);
568 args->verf = p; p += 2;
569 args->dircount = ntohl(*p++);
570 args->count = ntohl(*p++);
571
572 len = (args->count > NFSSVC_MAXBLKSIZE) ? NFSSVC_MAXBLKSIZE :
573 args->count;
574 args->count = len;
575
576 while (len > 0) {
577 pn = rqstp->rq_resused;
578 svc_take_page(rqstp);
579 if (!args->buffer)
580 args->buffer = page_address(rqstp->rq_respages[pn]);
581 len -= PAGE_SIZE;
582 }
583
584 return xdr_argsize_check(rqstp, p);
585 }
586
587 int
588 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, u32 *p,
589 struct nfsd3_commitargs *args)
590 {
591 if (!(p = decode_fh(p, &args->fh)))
592 return 0;
593 p = xdr_decode_hyper(p, &args->offset);
594 args->count = ntohl(*p++);
595
596 return xdr_argsize_check(rqstp, p);
597 }
598
599 /*
600 * XDR encode functions
601 */
602 /*
603 * There must be an encoding function for void results so svc_process
604 * will work properly.
605 */
606 int
607 nfs3svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
608 {
609 return xdr_ressize_check(rqstp, p);
610 }
611
612 /* GETATTR */
613 int
614 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
615 struct nfsd3_attrstat *resp)
616 {
617 if (resp->status == 0)
618 p = encode_fattr3(rqstp, p, &resp->fh);
619 return xdr_ressize_check(rqstp, p);
620 }
621
622 /* SETATTR, REMOVE, RMDIR */
623 int
624 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, u32 *p,
625 struct nfsd3_attrstat *resp)
626 {
627 p = encode_wcc_data(rqstp, p, &resp->fh);
628 return xdr_ressize_check(rqstp, p);
629 }
630
631 /* LOOKUP */
632 int
633 nfs3svc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
634 struct nfsd3_diropres *resp)
635 {
636 if (resp->status == 0) {
637 p = encode_fh(p, &resp->fh);
638 p = encode_post_op_attr(rqstp, p, &resp->fh);
639 }
640 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
641 return xdr_ressize_check(rqstp, p);
642 }
643
644 /* ACCESS */
645 int
646 nfs3svc_encode_accessres(struct svc_rqst *rqstp, u32 *p,
647 struct nfsd3_accessres *resp)
648 {
649 p = encode_post_op_attr(rqstp, p, &resp->fh);
650 if (resp->status == 0)
651 *p++ = htonl(resp->access);
652 return xdr_ressize_check(rqstp, p);
653 }
654
655 /* READLINK */
656 int
657 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p,
658 struct nfsd3_readlinkres *resp)
659 {
660 p = encode_post_op_attr(rqstp, p, &resp->fh);
661 if (resp->status == 0) {
662 *p++ = htonl(resp->len);
663 xdr_ressize_check(rqstp, p);
664 rqstp->rq_res.page_len = resp->len;
665 if (resp->len & 3) {
666 /* need to pad the tail */
667 rqstp->rq_restailpage = 0;
668 rqstp->rq_res.tail[0].iov_base = p;
669 *p = 0;
670 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
671 }
672 return 1;
673 } else
674 return xdr_ressize_check(rqstp, p);
675 }
676
677 /* READ */
678 int
679 nfs3svc_encode_readres(struct svc_rqst *rqstp, u32 *p,
680 struct nfsd3_readres *resp)
681 {
682 p = encode_post_op_attr(rqstp, p, &resp->fh);
683 if (resp->status == 0) {
684 *p++ = htonl(resp->count);
685 *p++ = htonl(resp->eof);
686 *p++ = htonl(resp->count); /* xdr opaque count */
687 xdr_ressize_check(rqstp, p);
688 /* now update rqstp->rq_res to reflect data aswell */
689 rqstp->rq_res.page_len = resp->count;
690 if (resp->count & 3) {
691 /* need to pad the tail */
692 rqstp->rq_restailpage = 0;
693 rqstp->rq_res.tail[0].iov_base = p;
694 *p = 0;
695 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
696 }
697 return 1;
698 } else
699 return xdr_ressize_check(rqstp, p);
700 }
701
702 /* WRITE */
703 int
704 nfs3svc_encode_writeres(struct svc_rqst *rqstp, u32 *p,
705 struct nfsd3_writeres *resp)
706 {
707 p = encode_wcc_data(rqstp, p, &resp->fh);
708 if (resp->status == 0) {
709 *p++ = htonl(resp->count);
710 *p++ = htonl(resp->committed);
711 *p++ = htonl(nfssvc_boot.tv_sec);
712 *p++ = htonl(nfssvc_boot.tv_usec);
713 }
714 return xdr_ressize_check(rqstp, p);
715 }
716
717 /* CREATE, MKDIR, SYMLINK, MKNOD */
718 int
719 nfs3svc_encode_createres(struct svc_rqst *rqstp, u32 *p,
720 struct nfsd3_diropres *resp)
721 {
722 if (resp->status == 0) {
723 *p++ = xdr_one;
724 p = encode_fh(p, &resp->fh);
725 p = encode_post_op_attr(rqstp, p, &resp->fh);
726 }
727 p = encode_wcc_data(rqstp, p, &resp->dirfh);
728 return xdr_ressize_check(rqstp, p);
729 }
730
731 /* RENAME */
732 int
733 nfs3svc_encode_renameres(struct svc_rqst *rqstp, u32 *p,
734 struct nfsd3_renameres *resp)
735 {
736 p = encode_wcc_data(rqstp, p, &resp->ffh);
737 p = encode_wcc_data(rqstp, p, &resp->tfh);
738 return xdr_ressize_check(rqstp, p);
739 }
740
741 /* LINK */
742 int
743 nfs3svc_encode_linkres(struct svc_rqst *rqstp, u32 *p,
744 struct nfsd3_linkres *resp)
745 {
746 p = encode_post_op_attr(rqstp, p, &resp->fh);
747 p = encode_wcc_data(rqstp, p, &resp->tfh);
748 return xdr_ressize_check(rqstp, p);
749 }
750
751 /* READDIR */
752 int
753 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
754 struct nfsd3_readdirres *resp)
755 {
756 p = encode_post_op_attr(rqstp, p, &resp->fh);
757
758 if (resp->status == 0) {
759 /* stupid readdir cookie */
760 memcpy(p, resp->verf, 8); p += 2;
761 xdr_ressize_check(rqstp, p);
762 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
763 return 1; /*No room for trailer */
764 rqstp->rq_res.page_len = (resp->count) << 2;
765
766 /* add the 'tail' to the end of the 'head' page - page 0. */
767 rqstp->rq_restailpage = 0;
768 rqstp->rq_res.tail[0].iov_base = p;
769 *p++ = 0; /* no more entries */
770 *p++ = htonl(resp->common.err == nfserr_eof);
771 rqstp->rq_res.tail[0].iov_len = 2<<2;
772 return 1;
773 } else
774 return xdr_ressize_check(rqstp, p);
775 }
776
777 static inline u32 *
778 encode_entry_baggage(struct nfsd3_readdirres *cd, u32 *p, const char *name,
779 int namlen, ino_t ino)
780 {
781 *p++ = xdr_one; /* mark entry present */
782 p = xdr_encode_hyper(p, ino); /* file id */
783 p = xdr_encode_array(p, name, namlen);/* name length & name */
784
785 cd->offset = p; /* remember pointer */
786 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
787
788 return p;
789 }
790
791 static inline u32 *
792 encode_entryplus_baggage(struct nfsd3_readdirres *cd, u32 *p,
793 struct svc_fh *fhp)
794 {
795 p = encode_post_op_attr(cd->rqstp, p, fhp);
796 *p++ = xdr_one; /* yes, a file handle follows */
797 p = encode_fh(p, fhp);
798 fh_put(fhp);
799 return p;
800 }
801
802 static int
803 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
804 const char *name, int namlen)
805 {
806 struct svc_export *exp;
807 struct dentry *dparent, *dchild;
808 int rv = 0;
809
810 dparent = cd->fh.fh_dentry;
811 exp = cd->fh.fh_export;
812
813 fh_init(fhp, NFS3_FHSIZE);
814 if (isdotent(name, namlen)) {
815 if (namlen == 2) {
816 dchild = dget_parent(dparent);
817 if (dchild == dparent) {
818 /* filesystem root - cannot return filehandle for ".." */
819 dput(dchild);
820 return 1;
821 }
822 } else
823 dchild = dget(dparent);
824 } else
825 dchild = lookup_one_len(name, dparent, namlen);
826 if (IS_ERR(dchild))
827 return 1;
828 if (d_mountpoint(dchild) ||
829 fh_compose(fhp, exp, dchild, &cd->fh) != 0 ||
830 !dchild->d_inode)
831 rv = 1;
832 dput(dchild);
833 return rv;
834 }
835
836 /*
837 * Encode a directory entry. This one works for both normal readdir
838 * and readdirplus.
839 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
840 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
841 *
842 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
843 * file handle.
844 */
845
846 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
847 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
848 static int
849 encode_entry(struct readdir_cd *ccd, const char *name,
850 int namlen, off_t offset, ino_t ino, unsigned int d_type, int plus)
851 {
852 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
853 common);
854 u32 *p = cd->buffer;
855 caddr_t curr_page_addr = NULL;
856 int pn; /* current page number */
857 int slen; /* string (name) length */
858 int elen; /* estimated entry length in words */
859 int num_entry_words = 0; /* actual number of words */
860
861 if (cd->offset) {
862 u64 offset64 = offset;
863
864 if (unlikely(cd->offset1)) {
865 /* we ended up with offset on a page boundary */
866 *cd->offset = htonl(offset64 >> 32);
867 *cd->offset1 = htonl(offset64 & 0xffffffff);
868 cd->offset1 = NULL;
869 } else {
870 xdr_encode_hyper(cd->offset, (u64) offset);
871 }
872 }
873
874 /*
875 dprintk("encode_entry(%.*s @%ld%s)\n",
876 namlen, name, (long) offset, plus? " plus" : "");
877 */
878
879 /* truncate filename if too long */
880 if (namlen > NFS3_MAXNAMLEN)
881 namlen = NFS3_MAXNAMLEN;
882
883 slen = XDR_QUADLEN(namlen);
884 elen = slen + NFS3_ENTRY_BAGGAGE
885 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
886
887 if (cd->buflen < elen) {
888 cd->common.err = nfserr_toosmall;
889 return -EINVAL;
890 }
891
892 /* determine which page in rq_respages[] we are currently filling */
893 for (pn=1; pn < cd->rqstp->rq_resused; pn++) {
894 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
895
896 if (((caddr_t)cd->buffer >= curr_page_addr) &&
897 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
898 break;
899 }
900
901 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
902 /* encode entry in current page */
903
904 p = encode_entry_baggage(cd, p, name, namlen, ino);
905
906 /* throw in readdirplus baggage */
907 if (plus) {
908 struct svc_fh fh;
909
910 if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
911 *p++ = 0;
912 *p++ = 0;
913 } else
914 p = encode_entryplus_baggage(cd, p, &fh);
915 }
916 num_entry_words = p - cd->buffer;
917 } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
918 /* temporarily encode entry into next page, then move back to
919 * current and next page in rq_respages[] */
920 u32 *p1, *tmp;
921 int len1, len2;
922
923 /* grab next page for temporary storage of entry */
924 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
925
926 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
927
928 /* throw in readdirplus baggage */
929 if (plus) {
930 struct svc_fh fh;
931
932 if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
933 /* zero out the filehandle */
934 *p1++ = 0;
935 *p1++ = 0;
936 } else
937 p1 = encode_entryplus_baggage(cd, p1, &fh);
938 }
939
940 /* determine entry word length and lengths to go in pages */
941 num_entry_words = p1 - tmp;
942 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
943 if ((num_entry_words << 2) < len1) {
944 /* the actual number of words in the entry is less
945 * than elen and can still fit in the current page
946 */
947 memmove(p, tmp, num_entry_words << 2);
948 p += num_entry_words;
949
950 /* update offset */
951 cd->offset = cd->buffer + (cd->offset - tmp);
952 } else {
953 unsigned int offset_r = (cd->offset - tmp) << 2;
954
955 /* update pointer to offset location.
956 * This is a 64bit quantity, so we need to
957 * deal with 3 cases:
958 * - entirely in first page
959 * - entirely in second page
960 * - 4 bytes in each page
961 */
962 if (offset_r + 8 <= len1) {
963 cd->offset = p + (cd->offset - tmp);
964 } else if (offset_r >= len1) {
965 cd->offset -= len1 >> 2;
966 } else {
967 /* sitting on the fence */
968 BUG_ON(offset_r != len1 - 4);
969 cd->offset = p + (cd->offset - tmp);
970 cd->offset1 = tmp;
971 }
972
973 len2 = (num_entry_words << 2) - len1;
974
975 /* move from temp page to current and next pages */
976 memmove(p, tmp, len1);
977 memmove(tmp, (caddr_t)tmp+len1, len2);
978
979 p = tmp + (len2 >> 2);
980 }
981 }
982 else {
983 cd->common.err = nfserr_toosmall;
984 return -EINVAL;
985 }
986
987 cd->buflen -= num_entry_words;
988 cd->buffer = p;
989 cd->common.err = nfs_ok;
990 return 0;
991
992 }
993
994 int
995 nfs3svc_encode_entry(struct readdir_cd *cd, const char *name,
996 int namlen, loff_t offset, ino_t ino, unsigned int d_type)
997 {
998 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
999 }
1000
1001 int
1002 nfs3svc_encode_entry_plus(struct readdir_cd *cd, const char *name,
1003 int namlen, loff_t offset, ino_t ino, unsigned int d_type)
1004 {
1005 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1006 }
1007
1008 /* FSSTAT */
1009 int
1010 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, u32 *p,
1011 struct nfsd3_fsstatres *resp)
1012 {
1013 struct kstatfs *s = &resp->stats;
1014 u64 bs = s->f_bsize;
1015
1016 *p++ = xdr_zero; /* no post_op_attr */
1017
1018 if (resp->status == 0) {
1019 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1020 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1021 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1022 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1023 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1024 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1025 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1026 }
1027 return xdr_ressize_check(rqstp, p);
1028 }
1029
1030 /* FSINFO */
1031 int
1032 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, u32 *p,
1033 struct nfsd3_fsinfores *resp)
1034 {
1035 *p++ = xdr_zero; /* no post_op_attr */
1036
1037 if (resp->status == 0) {
1038 *p++ = htonl(resp->f_rtmax);
1039 *p++ = htonl(resp->f_rtpref);
1040 *p++ = htonl(resp->f_rtmult);
1041 *p++ = htonl(resp->f_wtmax);
1042 *p++ = htonl(resp->f_wtpref);
1043 *p++ = htonl(resp->f_wtmult);
1044 *p++ = htonl(resp->f_dtpref);
1045 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1046 *p++ = xdr_one;
1047 *p++ = xdr_zero;
1048 *p++ = htonl(resp->f_properties);
1049 }
1050
1051 return xdr_ressize_check(rqstp, p);
1052 }
1053
1054 /* PATHCONF */
1055 int
1056 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, u32 *p,
1057 struct nfsd3_pathconfres *resp)
1058 {
1059 *p++ = xdr_zero; /* no post_op_attr */
1060
1061 if (resp->status == 0) {
1062 *p++ = htonl(resp->p_link_max);
1063 *p++ = htonl(resp->p_name_max);
1064 *p++ = htonl(resp->p_no_trunc);
1065 *p++ = htonl(resp->p_chown_restricted);
1066 *p++ = htonl(resp->p_case_insensitive);
1067 *p++ = htonl(resp->p_case_preserving);
1068 }
1069
1070 return xdr_ressize_check(rqstp, p);
1071 }
1072
1073 /* COMMIT */
1074 int
1075 nfs3svc_encode_commitres(struct svc_rqst *rqstp, u32 *p,
1076 struct nfsd3_commitres *resp)
1077 {
1078 p = encode_wcc_data(rqstp, p, &resp->fh);
1079 /* Write verifier */
1080 if (resp->status == 0) {
1081 *p++ = htonl(nfssvc_boot.tv_sec);
1082 *p++ = htonl(nfssvc_boot.tv_usec);
1083 }
1084 return xdr_ressize_check(rqstp, p);
1085 }
1086
1087 /*
1088 * XDR release functions
1089 */
1090 int
1091 nfs3svc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
1092 struct nfsd3_attrstat *resp)
1093 {
1094 fh_put(&resp->fh);
1095 return 1;
1096 }
1097
1098 int
1099 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, u32 *p,
1100 struct nfsd3_fhandle_pair *resp)
1101 {
1102 fh_put(&resp->fh1);
1103 fh_put(&resp->fh2);
1104 return 1;
1105 }
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