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initial commit with v2.6.9
[linux-2.6.9-moxart.git] / fs / nfsd / nfs3xdr.c
blobf3fbef66ec0f9ba91c53b90104739d5a47efd7e8
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 static inline u32 *
75 encode_fh(u32 *p, struct svc_fh *fhp)
76 {
77 unsigned int size = fhp->fh_handle.fh_size;
78 *p++ = htonl(size);
79 if (size) p[XDR_QUADLEN(size)-1]=0;
80 memcpy(p, &fhp->fh_handle.fh_base, size);
81 return p + XDR_QUADLEN(size);
82 }
83
84 /*
85 * Decode a file name and make sure that the path contains
86 * no slashes or null bytes.
87 */
88 static inline u32 *
89 decode_filename(u32 *p, char **namp, int *lenp)
90 {
91 char *name;
92 int i;
93
94 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
95 for (i = 0, name = *namp; i < *lenp; i++, name++) {
96 if (*name == '\0' || *name == '/')
97 return NULL;
98 }
99 }
100
101 return p;
102 }
103
104 static inline u32 *
105 decode_pathname(u32 *p, char **namp, int *lenp)
106 {
107 char *name;
108 int i;
109
110 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXPATHLEN)) != NULL) {
111 for (i = 0, name = *namp; i < *lenp; i++, name++) {
112 if (*name == '\0')
113 return NULL;
114 }
115 }
116
117 return p;
118 }
119
120 static inline u32 *
121 decode_sattr3(u32 *p, struct iattr *iap)
122 {
123 u32 tmp;
124
125 iap->ia_valid = 0;
126
127 if (*p++) {
128 iap->ia_valid |= ATTR_MODE;
129 iap->ia_mode = ntohl(*p++);
130 }
131 if (*p++) {
132 iap->ia_valid |= ATTR_UID;
133 iap->ia_uid = ntohl(*p++);
134 }
135 if (*p++) {
136 iap->ia_valid |= ATTR_GID;
137 iap->ia_gid = ntohl(*p++);
138 }
139 if (*p++) {
140 u64 newsize;
141
142 iap->ia_valid |= ATTR_SIZE;
143 p = xdr_decode_hyper(p, &newsize);
144 if (newsize <= NFS_OFFSET_MAX)
145 iap->ia_size = newsize;
146 else
147 iap->ia_size = NFS_OFFSET_MAX;
148 }
149 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
150 iap->ia_valid |= ATTR_ATIME;
151 } else if (tmp == 2) { /* set to client time */
152 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
153 iap->ia_atime.tv_sec = ntohl(*p++);
154 iap->ia_atime.tv_nsec = ntohl(*p++);
155 }
156 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
157 iap->ia_valid |= ATTR_MTIME;
158 } else if (tmp == 2) { /* set to client time */
159 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
160 iap->ia_mtime.tv_sec = ntohl(*p++);
161 iap->ia_mtime.tv_nsec = ntohl(*p++);
162 }
163 return p;
164 }
165
166 static inline u32 *
167 encode_fattr3(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
168 {
169 struct vfsmount *mnt = fhp->fh_export->ex_mnt;
170 struct dentry *dentry = fhp->fh_dentry;
171 struct kstat stat;
172 struct timespec time;
173
174 vfs_getattr(mnt, dentry, &stat);
175
176 *p++ = htonl(nfs3_ftypes[(stat.mode & S_IFMT) >> 12]);
177 *p++ = htonl((u32) stat.mode);
178 *p++ = htonl((u32) stat.nlink);
179 *p++ = htonl((u32) nfsd_ruid(rqstp, stat.uid));
180 *p++ = htonl((u32) nfsd_rgid(rqstp, stat.gid));
181 if (S_ISLNK(stat.mode) && stat.size > NFS3_MAXPATHLEN) {
182 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
183 } else {
184 p = xdr_encode_hyper(p, (u64) stat.size);
185 }
186 p = xdr_encode_hyper(p, ((u64)stat.blocks) << 9);
187 *p++ = htonl((u32) MAJOR(stat.rdev));
188 *p++ = htonl((u32) MINOR(stat.rdev));
189 if (is_fsid(fhp, rqstp->rq_reffh))
190 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
191 else
192 p = xdr_encode_hyper(p, (u64) huge_encode_dev(stat.dev));
193 p = xdr_encode_hyper(p, (u64) stat.ino);
194 p = encode_time3(p, &stat.atime);
195 lease_get_mtime(dentry->d_inode, &time);
196 p = encode_time3(p, &time);
197 p = encode_time3(p, &stat.ctime);
198
199 return p;
200 }
201
202 static inline u32 *
203 encode_saved_post_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
204 {
205 struct inode *inode = fhp->fh_dentry->d_inode;
206
207 /* Attributes to follow */
208 *p++ = xdr_one;
209
210 *p++ = htonl(nfs3_ftypes[(fhp->fh_post_mode & S_IFMT) >> 12]);
211 *p++ = htonl((u32) fhp->fh_post_mode);
212 *p++ = htonl((u32) fhp->fh_post_nlink);
213 *p++ = htonl((u32) nfsd_ruid(rqstp, fhp->fh_post_uid));
214 *p++ = htonl((u32) nfsd_rgid(rqstp, fhp->fh_post_gid));
215 if (S_ISLNK(fhp->fh_post_mode) && fhp->fh_post_size > NFS3_MAXPATHLEN) {
216 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
217 } else {
218 p = xdr_encode_hyper(p, (u64) fhp->fh_post_size);
219 }
220 p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9);
221 *p++ = fhp->fh_post_rdev[0];
222 *p++ = fhp->fh_post_rdev[1];
223 if (is_fsid(fhp, rqstp->rq_reffh))
224 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
225 else
226 p = xdr_encode_hyper(p, (u64)huge_encode_dev(inode->i_sb->s_dev));
227 p = xdr_encode_hyper(p, (u64) inode->i_ino);
228 p = encode_time3(p, &fhp->fh_post_atime);
229 p = encode_time3(p, &fhp->fh_post_mtime);
230 p = encode_time3(p, &fhp->fh_post_ctime);
231
232 return p;
233 }
234
235 /*
236 * Encode post-operation attributes.
237 * The inode may be NULL if the call failed because of a stale file
238 * handle. In this case, no attributes are returned.
239 */
240 static u32 *
241 encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
242 {
243 struct dentry *dentry = fhp->fh_dentry;
244 if (dentry && dentry->d_inode != NULL) {
245 *p++ = xdr_one; /* attributes follow */
246 return encode_fattr3(rqstp, p, fhp);
247 }
248 *p++ = xdr_zero;
249 return p;
250 }
251
252 /*
253 * Enocde weak cache consistency data
254 */
255 static u32 *
256 encode_wcc_data(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
257 {
258 struct dentry *dentry = fhp->fh_dentry;
259
260 if (dentry && dentry->d_inode && fhp->fh_post_saved) {
261 if (fhp->fh_pre_saved) {
262 *p++ = xdr_one;
263 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
264 p = encode_time3(p, &fhp->fh_pre_mtime);
265 p = encode_time3(p, &fhp->fh_pre_ctime);
266 } else {
267 *p++ = xdr_zero;
268 }
269 return encode_saved_post_attr(rqstp, p, fhp);
270 }
271 /* no pre- or post-attrs */
272 *p++ = xdr_zero;
273 return encode_post_op_attr(rqstp, p, fhp);
274 }
275
276
277 /*
278 * XDR decode functions
279 */
280 int
281 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct nfsd_fhandle *args)
282 {
283 if (!(p = decode_fh(p, &args->fh)))
284 return 0;
285 return xdr_argsize_check(rqstp, p);
286 }
287
288 int
289 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p,
290 struct nfsd3_sattrargs *args)
291 {
292 if (!(p = decode_fh(p, &args->fh))
293 || !(p = decode_sattr3(p, &args->attrs)))
294 return 0;
295
296 if ((args->check_guard = ntohl(*p++)) != 0) {
297 struct timespec time;
298 p = decode_time3(p, &time);
299 args->guardtime = time.tv_sec;
300 }
301
302 return xdr_argsize_check(rqstp, p);
303 }
304
305 int
306 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, u32 *p,
307 struct nfsd3_diropargs *args)
308 {
309 if (!(p = decode_fh(p, &args->fh))
310 || !(p = decode_filename(p, &args->name, &args->len)))
311 return 0;
312
313 return xdr_argsize_check(rqstp, p);
314 }
315
316 int
317 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, u32 *p,
318 struct nfsd3_accessargs *args)
319 {
320 if (!(p = decode_fh(p, &args->fh)))
321 return 0;
322 args->access = ntohl(*p++);
323
324 return xdr_argsize_check(rqstp, p);
325 }
326
327 int
328 nfs3svc_decode_readargs(struct svc_rqst *rqstp, u32 *p,
329 struct nfsd3_readargs *args)
330 {
331 unsigned int len;
332 int v,pn;
333
334 if (!(p = decode_fh(p, &args->fh))
335 || !(p = xdr_decode_hyper(p, &args->offset)))
336 return 0;
337
338 len = args->count = ntohl(*p++);
339
340 if (len > NFSSVC_MAXBLKSIZE)
341 len = NFSSVC_MAXBLKSIZE;
342
343 /* set up the kvec */
344 v=0;
345 while (len > 0) {
346 pn = rqstp->rq_resused;
347 svc_take_page(rqstp);
348 args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
349 args->vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
350 len -= args->vec[v].iov_len;
351 v++;
352 }
353 args->vlen = v;
354 return xdr_argsize_check(rqstp, p);
355 }
356
357 int
358 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, u32 *p,
359 struct nfsd3_writeargs *args)
360 {
361 unsigned int len, v, hdr;
362
363 if (!(p = decode_fh(p, &args->fh))
364 || !(p = xdr_decode_hyper(p, &args->offset)))
365 return 0;
366
367 args->count = ntohl(*p++);
368 args->stable = ntohl(*p++);
369 len = args->len = ntohl(*p++);
370
371 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
372 if (rqstp->rq_arg.len < len + hdr)
373 return 0;
374
375 args->vec[0].iov_base = (void*)p;
376 args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
377
378 if (len > NFSSVC_MAXBLKSIZE)
379 len = NFSSVC_MAXBLKSIZE;
380 v= 0;
381 while (len > args->vec[v].iov_len) {
382 len -= args->vec[v].iov_len;
383 v++;
384 args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]);
385 args->vec[v].iov_len = PAGE_SIZE;
386 }
387 args->vec[v].iov_len = len;
388 args->vlen = v+1;
389
390 return args->count == args->len && args->vec[0].iov_len > 0;
391 }
392
393 int
394 nfs3svc_decode_createargs(struct svc_rqst *rqstp, u32 *p,
395 struct nfsd3_createargs *args)
396 {
397 if (!(p = decode_fh(p, &args->fh))
398 || !(p = decode_filename(p, &args->name, &args->len)))
399 return 0;
400
401 switch (args->createmode = ntohl(*p++)) {
402 case NFS3_CREATE_UNCHECKED:
403 case NFS3_CREATE_GUARDED:
404 if (!(p = decode_sattr3(p, &args->attrs)))
405 return 0;
406 break;
407 case NFS3_CREATE_EXCLUSIVE:
408 args->verf = p;
409 p += 2;
410 break;
411 default:
412 return 0;
413 }
414
415 return xdr_argsize_check(rqstp, p);
416 }
417 int
418 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, u32 *p,
419 struct nfsd3_createargs *args)
420 {
421 if (!(p = decode_fh(p, &args->fh))
422 || !(p = decode_filename(p, &args->name, &args->len))
423 || !(p = decode_sattr3(p, &args->attrs)))
424 return 0;
425
426 return xdr_argsize_check(rqstp, p);
427 }
428
429 int
430 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p,
431 struct nfsd3_symlinkargs *args)
432 {
433 unsigned int len;
434 int avail;
435 char *old, *new;
436 struct kvec *vec;
437
438 if (!(p = decode_fh(p, &args->ffh))
439 || !(p = decode_filename(p, &args->fname, &args->flen))
440 || !(p = decode_sattr3(p, &args->attrs))
441 )
442 return 0;
443 /* now decode the pathname, which might be larger than the first page.
444 * As we have to check for nul's anyway, we copy it into a new page
445 * This page appears in the rq_res.pages list, but as pages_len is always
446 * 0, it won't get in the way
447 */
448 svc_take_page(rqstp);
449 len = ntohl(*p++);
450 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
451 return 0;
452 args->tname = new = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
453 args->tlen = len;
454 /* first copy and check from the first page */
455 old = (char*)p;
456 vec = &rqstp->rq_arg.head[0];
457 avail = vec->iov_len - (old - (char*)vec->iov_base);
458 while (len && avail && *old) {
459 *new++ = *old++;
460 len--;
461 avail--;
462 }
463 /* now copy next page if there is one */
464 if (len && !avail && rqstp->rq_arg.page_len) {
465 avail = rqstp->rq_arg.page_len;
466 if (avail > PAGE_SIZE) avail = PAGE_SIZE;
467 old = page_address(rqstp->rq_arg.pages[0]);
468 }
469 while (len && avail && *old) {
470 *new++ = *old++;
471 len--;
472 avail--;
473 }
474 *new = '\0';
475 if (len)
476 return 0;
477
478 return 1;
479 }
480
481 int
482 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, u32 *p,
483 struct nfsd3_mknodargs *args)
484 {
485 if (!(p = decode_fh(p, &args->fh))
486 || !(p = decode_filename(p, &args->name, &args->len)))
487 return 0;
488
489 args->ftype = ntohl(*p++);
490
491 if (args->ftype == NF3BLK || args->ftype == NF3CHR
492 || args->ftype == NF3SOCK || args->ftype == NF3FIFO) {
493 if (!(p = decode_sattr3(p, &args->attrs)))
494 return 0;
495 }
496
497 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
498 args->major = ntohl(*p++);
499 args->minor = ntohl(*p++);
500 }
501
502 return xdr_argsize_check(rqstp, p);
503 }
504
505 int
506 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, u32 *p,
507 struct nfsd3_renameargs *args)
508 {
509 if (!(p = decode_fh(p, &args->ffh))
510 || !(p = decode_filename(p, &args->fname, &args->flen))
511 || !(p = decode_fh(p, &args->tfh))
512 || !(p = decode_filename(p, &args->tname, &args->tlen)))
513 return 0;
514
515 return xdr_argsize_check(rqstp, p);
516 }
517
518 int
519 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p,
520 struct nfsd3_readlinkargs *args)
521 {
522 if (!(p = decode_fh(p, &args->fh)))
523 return 0;
524 svc_take_page(rqstp);
525 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
526
527 return xdr_argsize_check(rqstp, p);
528 }
529
530 int
531 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, u32 *p,
532 struct nfsd3_linkargs *args)
533 {
534 if (!(p = decode_fh(p, &args->ffh))
535 || !(p = decode_fh(p, &args->tfh))
536 || !(p = decode_filename(p, &args->tname, &args->tlen)))
537 return 0;
538
539 return xdr_argsize_check(rqstp, p);
540 }
541
542 int
543 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p,
544 struct nfsd3_readdirargs *args)
545 {
546 if (!(p = decode_fh(p, &args->fh)))
547 return 0;
548 p = xdr_decode_hyper(p, &args->cookie);
549 args->verf = p; p += 2;
550 args->dircount = ~0;
551 args->count = ntohl(*p++);
552
553 if (args->count > PAGE_SIZE)
554 args->count = PAGE_SIZE;
555
556 svc_take_page(rqstp);
557 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
558
559 return xdr_argsize_check(rqstp, p);
560 }
561
562 int
563 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p,
564 struct nfsd3_readdirargs *args)
565 {
566 int len, pn;
567
568 if (!(p = decode_fh(p, &args->fh)))
569 return 0;
570 p = xdr_decode_hyper(p, &args->cookie);
571 args->verf = p; p += 2;
572 args->dircount = ntohl(*p++);
573 args->count = ntohl(*p++);
574
575 len = (args->count > NFSSVC_MAXBLKSIZE) ? NFSSVC_MAXBLKSIZE :
576 args->count;
577 args->count = len;
578
579 while (len > 0) {
580 pn = rqstp->rq_resused;
581 svc_take_page(rqstp);
582 if (!args->buffer)
583 args->buffer = page_address(rqstp->rq_respages[pn]);
584 len -= PAGE_SIZE;
585 }
586
587 return xdr_argsize_check(rqstp, p);
588 }
589
590 int
591 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, u32 *p,
592 struct nfsd3_commitargs *args)
593 {
594 if (!(p = decode_fh(p, &args->fh)))
595 return 0;
596 p = xdr_decode_hyper(p, &args->offset);
597 args->count = ntohl(*p++);
598
599 return xdr_argsize_check(rqstp, p);
600 }
601
602 /*
603 * XDR encode functions
604 */
605 /*
606 * There must be an encoding function for void results so svc_process
607 * will work properly.
608 */
609 int
610 nfs3svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
611 {
612 return xdr_ressize_check(rqstp, p);
613 }
614
615 /* GETATTR */
616 int
617 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
618 struct nfsd3_attrstat *resp)
619 {
620 if (resp->status == 0)
621 p = encode_fattr3(rqstp, p, &resp->fh);
622 return xdr_ressize_check(rqstp, p);
623 }
624
625 /* SETATTR, REMOVE, RMDIR */
626 int
627 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, u32 *p,
628 struct nfsd3_attrstat *resp)
629 {
630 p = encode_wcc_data(rqstp, p, &resp->fh);
631 return xdr_ressize_check(rqstp, p);
632 }
633
634 /* LOOKUP */
635 int
636 nfs3svc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
637 struct nfsd3_diropres *resp)
638 {
639 if (resp->status == 0) {
640 p = encode_fh(p, &resp->fh);
641 p = encode_post_op_attr(rqstp, p, &resp->fh);
642 }
643 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
644 return xdr_ressize_check(rqstp, p);
645 }
646
647 /* ACCESS */
648 int
649 nfs3svc_encode_accessres(struct svc_rqst *rqstp, u32 *p,
650 struct nfsd3_accessres *resp)
651 {
652 p = encode_post_op_attr(rqstp, p, &resp->fh);
653 if (resp->status == 0)
654 *p++ = htonl(resp->access);
655 return xdr_ressize_check(rqstp, p);
656 }
657
658 /* READLINK */
659 int
660 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p,
661 struct nfsd3_readlinkres *resp)
662 {
663 p = encode_post_op_attr(rqstp, p, &resp->fh);
664 if (resp->status == 0) {
665 *p++ = htonl(resp->len);
666 xdr_ressize_check(rqstp, p);
667 rqstp->rq_res.page_len = resp->len;
668 if (resp->len & 3) {
669 /* need to pad the tail */
670 rqstp->rq_restailpage = 0;
671 rqstp->rq_res.tail[0].iov_base = p;
672 *p = 0;
673 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
674 }
675 return 1;
676 } else
677 return xdr_ressize_check(rqstp, p);
678 }
679
680 /* READ */
681 int
682 nfs3svc_encode_readres(struct svc_rqst *rqstp, u32 *p,
683 struct nfsd3_readres *resp)
684 {
685 p = encode_post_op_attr(rqstp, p, &resp->fh);
686 if (resp->status == 0) {
687 *p++ = htonl(resp->count);
688 *p++ = htonl(resp->eof);
689 *p++ = htonl(resp->count); /* xdr opaque count */
690 xdr_ressize_check(rqstp, p);
691 /* now update rqstp->rq_res to reflect data aswell */
692 rqstp->rq_res.page_len = resp->count;
693 if (resp->count & 3) {
694 /* need to pad the tail */
695 rqstp->rq_restailpage = 0;
696 rqstp->rq_res.tail[0].iov_base = p;
697 *p = 0;
698 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
699 }
700 return 1;
701 } else
702 return xdr_ressize_check(rqstp, p);
703 }
704
705 /* WRITE */
706 int
707 nfs3svc_encode_writeres(struct svc_rqst *rqstp, u32 *p,
708 struct nfsd3_writeres *resp)
709 {
710 p = encode_wcc_data(rqstp, p, &resp->fh);
711 if (resp->status == 0) {
712 *p++ = htonl(resp->count);
713 *p++ = htonl(resp->committed);
714 *p++ = htonl(nfssvc_boot.tv_sec);
715 *p++ = htonl(nfssvc_boot.tv_usec);
716 }
717 return xdr_ressize_check(rqstp, p);
718 }
719
720 /* CREATE, MKDIR, SYMLINK, MKNOD */
721 int
722 nfs3svc_encode_createres(struct svc_rqst *rqstp, u32 *p,
723 struct nfsd3_diropres *resp)
724 {
725 if (resp->status == 0) {
726 *p++ = xdr_one;
727 p = encode_fh(p, &resp->fh);
728 p = encode_post_op_attr(rqstp, p, &resp->fh);
729 }
730 p = encode_wcc_data(rqstp, p, &resp->dirfh);
731 return xdr_ressize_check(rqstp, p);
732 }
733
734 /* RENAME */
735 int
736 nfs3svc_encode_renameres(struct svc_rqst *rqstp, u32 *p,
737 struct nfsd3_renameres *resp)
738 {
739 p = encode_wcc_data(rqstp, p, &resp->ffh);
740 p = encode_wcc_data(rqstp, p, &resp->tfh);
741 return xdr_ressize_check(rqstp, p);
742 }
743
744 /* LINK */
745 int
746 nfs3svc_encode_linkres(struct svc_rqst *rqstp, u32 *p,
747 struct nfsd3_linkres *resp)
748 {
749 p = encode_post_op_attr(rqstp, p, &resp->fh);
750 p = encode_wcc_data(rqstp, p, &resp->tfh);
751 return xdr_ressize_check(rqstp, p);
752 }
753
754 /* READDIR */
755 int
756 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
757 struct nfsd3_readdirres *resp)
758 {
759 p = encode_post_op_attr(rqstp, p, &resp->fh);
760
761 if (resp->status == 0) {
762 /* stupid readdir cookie */
763 memcpy(p, resp->verf, 8); p += 2;
764 xdr_ressize_check(rqstp, p);
765 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
766 return 1; /*No room for trailer */
767 rqstp->rq_res.page_len = (resp->count) << 2;
768
769 /* add the 'tail' to the end of the 'head' page - page 0. */
770 rqstp->rq_restailpage = 0;
771 rqstp->rq_res.tail[0].iov_base = p;
772 *p++ = 0; /* no more entries */
773 *p++ = htonl(resp->common.err == nfserr_eof);
774 rqstp->rq_res.tail[0].iov_len = 2<<2;
775 return 1;
776 } else
777 return xdr_ressize_check(rqstp, p);
778 }
779
780 static inline u32 *
781 encode_entry_baggage(struct nfsd3_readdirres *cd, u32 *p, const char *name,
782 int namlen, ino_t ino)
783 {
784 *p++ = xdr_one; /* mark entry present */
785 p = xdr_encode_hyper(p, ino); /* file id */
786 p = xdr_encode_array(p, name, namlen);/* name length & name */
787
788 cd->offset = p; /* remember pointer */
789 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
790
791 return p;
792 }
793
794 static inline u32 *
795 encode_entryplus_baggage(struct nfsd3_readdirres *cd, u32 *p,
796 struct svc_fh *fhp)
797 {
798 p = encode_post_op_attr(cd->rqstp, p, fhp);
799 *p++ = xdr_one; /* yes, a file handle follows */
800 p = encode_fh(p, fhp);
801 fh_put(fhp);
802 return p;
803 }
804
805 static int
806 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
807 const char *name, int namlen)
808 {
809 struct svc_export *exp;
810 struct dentry *dparent, *dchild;
811 int rv = 0;
812
813 dparent = cd->fh.fh_dentry;
814 exp = cd->fh.fh_export;
815
816 fh_init(fhp, NFS3_FHSIZE);
817 if (isdotent(name, namlen)) {
818 if (namlen == 2) {
819 dchild = dget_parent(dparent);
820 } else
821 dchild = dget(dparent);
822 } else
823 dchild = lookup_one_len(name, dparent, namlen);
824 if (IS_ERR(dchild))
825 return 1;
826 if (d_mountpoint(dchild) ||
827 fh_compose(fhp, exp, dchild, &cd->fh) != 0 ||
828 !dchild->d_inode)
829 rv = 1;
830 dput(dchild);
831 return rv;
832 }
833
834 /*
835 * Encode a directory entry. This one works for both normal readdir
836 * and readdirplus.
837 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
838 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
839 *
840 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
841 * file handle.
842 */
843
844 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
845 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
846 static int
847 encode_entry(struct readdir_cd *ccd, const char *name,
848 int namlen, off_t offset, ino_t ino, unsigned int d_type, int plus)
849 {
850 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
851 common);
852 u32 *p = cd->buffer;
853 caddr_t curr_page_addr = NULL;
854 int pn; /* current page number */
855 int slen; /* string (name) length */
856 int elen; /* estimated entry length in words */
857 int num_entry_words = 0; /* actual number of words */
858
859 if (cd->offset) {
860 u64 offset64 = offset;
861
862 if (unlikely(cd->offset1)) {
863 /* we ended up with offset on a page boundary */
864 *cd->offset = htonl(offset64 >> 32);
865 *cd->offset1 = htonl(offset64 & 0xffffffff);
866 cd->offset1 = NULL;
867 } else {
868 xdr_encode_hyper(cd->offset, (u64) offset);
869 }
870 }
871
872 /*
873 dprintk("encode_entry(%.*s @%ld%s)\n",
874 namlen, name, (long) offset, plus? " plus" : "");
875 */
876
877 /* truncate filename if too long */
878 if (namlen > NFS3_MAXNAMLEN)
879 namlen = NFS3_MAXNAMLEN;
880
881 slen = XDR_QUADLEN(namlen);
882 elen = slen + NFS3_ENTRY_BAGGAGE
883 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
884
885 if (cd->buflen < elen) {
886 cd->common.err = nfserr_toosmall;
887 return -EINVAL;
888 }
889
890 /* determine which page in rq_respages[] we are currently filling */
891 for (pn=1; pn < cd->rqstp->rq_resused; pn++) {
892 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
893
894 if (((caddr_t)cd->buffer >= curr_page_addr) &&
895 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
896 break;
897 }
898
899 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
900 /* encode entry in current page */
901
902 p = encode_entry_baggage(cd, p, name, namlen, ino);
903
904 /* throw in readdirplus baggage */
905 if (plus) {
906 struct svc_fh fh;
907
908 if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
909 *p++ = 0;
910 *p++ = 0;
911 } else
912 p = encode_entryplus_baggage(cd, p, &fh);
913 }
914 num_entry_words = p - cd->buffer;
915 } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
916 /* temporarily encode entry into next page, then move back to
917 * current and next page in rq_respages[] */
918 u32 *p1, *tmp;
919 int len1, len2;
920
921 /* grab next page for temporary storage of entry */
922 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
923
924 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
925
926 /* throw in readdirplus baggage */
927 if (plus) {
928 struct svc_fh fh;
929
930 if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
931 /* zero out the filehandle */
932 *p1++ = 0;
933 *p1++ = 0;
934 } else
935 p1 = encode_entryplus_baggage(cd, p1, &fh);
936 }
937
938 /* determine entry word length and lengths to go in pages */
939 num_entry_words = p1 - tmp;
940 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
941 if ((num_entry_words << 2) < len1) {
942 /* the actual number of words in the entry is less
943 * than elen and can still fit in the current page
944 */
945 memmove(p, tmp, num_entry_words << 2);
946 p += num_entry_words;
947
948 /* update offset */
949 cd->offset = cd->buffer + (cd->offset - tmp);
950 } else {
951 unsigned int offset_r = (cd->offset - tmp) << 2;
952
953 /* update pointer to offset location.
954 * This is a 64bit quantity, so we need to
955 * deal with 3 cases:
956 * - entirely in first page
957 * - entirely in second page
958 * - 4 bytes in each page
959 */
960 if (offset_r + 8 <= len1) {
961 cd->offset = p + (cd->offset - tmp);
962 } else if (offset_r >= len1) {
963 cd->offset -= len1 >> 2;
964 } else {
965 /* sitting on the fence */
966 BUG_ON(offset_r != len1 - 4);
967 cd->offset = p + (cd->offset - tmp);
968 cd->offset1 = tmp;
969 }
970
971 len2 = (num_entry_words << 2) - len1;
972
973 /* move from temp page to current and next pages */
974 memmove(p, tmp, len1);
975 memmove(tmp, (caddr_t)tmp+len1, len2);
976
977 p = tmp + (len2 >> 2);
978 }
979 }
980 else {
981 cd->common.err = nfserr_toosmall;
982 return -EINVAL;
983 }
984
985 cd->buflen -= num_entry_words;
986 cd->buffer = p;
987 cd->common.err = nfs_ok;
988 return 0;
989
990 }
991
992 int
993 nfs3svc_encode_entry(struct readdir_cd *cd, const char *name,
994 int namlen, loff_t offset, ino_t ino, unsigned int d_type)
995 {
996 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
997 }
998
999 int
1000 nfs3svc_encode_entry_plus(struct readdir_cd *cd, const char *name,
1001 int namlen, loff_t offset, ino_t ino, unsigned int d_type)
1002 {
1003 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1004 }
1005
1006 /* FSSTAT */
1007 int
1008 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, u32 *p,
1009 struct nfsd3_fsstatres *resp)
1010 {
1011 struct kstatfs *s = &resp->stats;
1012 u64 bs = s->f_bsize;
1013
1014 *p++ = xdr_zero; /* no post_op_attr */
1015
1016 if (resp->status == 0) {
1017 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1018 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1019 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1020 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1021 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1022 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1023 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1024 }
1025 return xdr_ressize_check(rqstp, p);
1026 }
1027
1028 /* FSINFO */
1029 int
1030 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, u32 *p,
1031 struct nfsd3_fsinfores *resp)
1032 {
1033 *p++ = xdr_zero; /* no post_op_attr */
1034
1035 if (resp->status == 0) {
1036 *p++ = htonl(resp->f_rtmax);
1037 *p++ = htonl(resp->f_rtpref);
1038 *p++ = htonl(resp->f_rtmult);
1039 *p++ = htonl(resp->f_wtmax);
1040 *p++ = htonl(resp->f_wtpref);
1041 *p++ = htonl(resp->f_wtmult);
1042 *p++ = htonl(resp->f_dtpref);
1043 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1044 *p++ = xdr_one;
1045 *p++ = xdr_zero;
1046 *p++ = htonl(resp->f_properties);
1047 }
1048
1049 return xdr_ressize_check(rqstp, p);
1050 }
1051
1052 /* PATHCONF */
1053 int
1054 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, u32 *p,
1055 struct nfsd3_pathconfres *resp)
1056 {
1057 *p++ = xdr_zero; /* no post_op_attr */
1058
1059 if (resp->status == 0) {
1060 *p++ = htonl(resp->p_link_max);
1061 *p++ = htonl(resp->p_name_max);
1062 *p++ = htonl(resp->p_no_trunc);
1063 *p++ = htonl(resp->p_chown_restricted);
1064 *p++ = htonl(resp->p_case_insensitive);
1065 *p++ = htonl(resp->p_case_preserving);
1066 }
1067
1068 return xdr_ressize_check(rqstp, p);
1069 }
1070
1071 /* COMMIT */
1072 int
1073 nfs3svc_encode_commitres(struct svc_rqst *rqstp, u32 *p,
1074 struct nfsd3_commitres *resp)
1075 {
1076 p = encode_wcc_data(rqstp, p, &resp->fh);
1077 /* Write verifier */
1078 if (resp->status == 0) {
1079 *p++ = htonl(nfssvc_boot.tv_sec);
1080 *p++ = htonl(nfssvc_boot.tv_usec);
1081 }
1082 return xdr_ressize_check(rqstp, p);
1083 }
1084
1085 /*
1086 * XDR release functions
1087 */
1088 int
1089 nfs3svc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
1090 struct nfsd3_attrstat *resp)
1091 {
1092 fh_put(&resp->fh);
1093 return 1;
1094 }
1095
1096 int
1097 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, u32 *p,
1098 struct nfsd3_fhandle_pair *resp)
1099 {
1100 fh_put(&resp->fh1);
1101 fh_put(&resp->fh2);
1102 return 1;
1103 }
MOXA 2.6.9 from sdlinux-moxaart.tgz