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Linux 2.6.17.7
[linux/fpc-iii.git] / fs / nfsd / nfs3xdr.c
blob243d94b9653a4efcf9804a0820a27bf676d16557
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 struct kstat *stat)
159 {
160 struct dentry *dentry = fhp->fh_dentry;
161 struct timespec time;
162
163 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
164 *p++ = htonl((u32) stat->mode);
165 *p++ = htonl((u32) stat->nlink);
166 *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
167 *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
168 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
169 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
170 } else {
171 p = xdr_encode_hyper(p, (u64) stat->size);
172 }
173 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
174 *p++ = htonl((u32) MAJOR(stat->rdev));
175 *p++ = htonl((u32) MINOR(stat->rdev));
176 if (is_fsid(fhp, rqstp->rq_reffh))
177 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
178 else
179 p = xdr_encode_hyper(p, (u64) huge_encode_dev(stat->dev));
180 p = xdr_encode_hyper(p, (u64) stat->ino);
181 p = encode_time3(p, &stat->atime);
182 lease_get_mtime(dentry->d_inode, &time);
183 p = encode_time3(p, &time);
184 p = encode_time3(p, &stat->ctime);
185
186 return p;
187 }
188
189 static inline u32 *
190 encode_saved_post_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
191 {
192 struct inode *inode = fhp->fh_dentry->d_inode;
193
194 /* Attributes to follow */
195 *p++ = xdr_one;
196
197 *p++ = htonl(nfs3_ftypes[(fhp->fh_post_mode & S_IFMT) >> 12]);
198 *p++ = htonl((u32) fhp->fh_post_mode);
199 *p++ = htonl((u32) fhp->fh_post_nlink);
200 *p++ = htonl((u32) nfsd_ruid(rqstp, fhp->fh_post_uid));
201 *p++ = htonl((u32) nfsd_rgid(rqstp, fhp->fh_post_gid));
202 if (S_ISLNK(fhp->fh_post_mode) && fhp->fh_post_size > NFS3_MAXPATHLEN) {
203 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
204 } else {
205 p = xdr_encode_hyper(p, (u64) fhp->fh_post_size);
206 }
207 p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9);
208 *p++ = fhp->fh_post_rdev[0];
209 *p++ = fhp->fh_post_rdev[1];
210 if (is_fsid(fhp, rqstp->rq_reffh))
211 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
212 else
213 p = xdr_encode_hyper(p, (u64)huge_encode_dev(inode->i_sb->s_dev));
214 p = xdr_encode_hyper(p, (u64) inode->i_ino);
215 p = encode_time3(p, &fhp->fh_post_atime);
216 p = encode_time3(p, &fhp->fh_post_mtime);
217 p = encode_time3(p, &fhp->fh_post_ctime);
218
219 return p;
220 }
221
222 /*
223 * Encode post-operation attributes.
224 * The inode may be NULL if the call failed because of a stale file
225 * handle. In this case, no attributes are returned.
226 */
227 static u32 *
228 encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
229 {
230 struct dentry *dentry = fhp->fh_dentry;
231 if (dentry && dentry->d_inode != NULL) {
232 int err;
233 struct kstat stat;
234
235 err = vfs_getattr(fhp->fh_export->ex_mnt, dentry, &stat);
236 if (!err) {
237 *p++ = xdr_one; /* attributes follow */
238 return encode_fattr3(rqstp, p, fhp, &stat);
239 }
240 }
241 *p++ = xdr_zero;
242 return p;
243 }
244
245 /* Helper for NFSv3 ACLs */
246 u32 *
247 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
248 {
249 return encode_post_op_attr(rqstp, p, fhp);
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 < hdr ||
373 rqstp->rq_arg.len - hdr < len)
374 return 0;
375
376 args->vec[0].iov_base = (void*)p;
377 args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
378
379 if (len > NFSSVC_MAXBLKSIZE)
380 len = NFSSVC_MAXBLKSIZE;
381 v= 0;
382 while (len > args->vec[v].iov_len) {
383 len -= args->vec[v].iov_len;
384 v++;
385 args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]);
386 args->vec[v].iov_len = PAGE_SIZE;
387 }
388 args->vec[v].iov_len = len;
389 args->vlen = v+1;
390
391 return args->count == args->len && args->vec[0].iov_len > 0;
392 }
393
394 int
395 nfs3svc_decode_createargs(struct svc_rqst *rqstp, u32 *p,
396 struct nfsd3_createargs *args)
397 {
398 if (!(p = decode_fh(p, &args->fh))
399 || !(p = decode_filename(p, &args->name, &args->len)))
400 return 0;
401
402 switch (args->createmode = ntohl(*p++)) {
403 case NFS3_CREATE_UNCHECKED:
404 case NFS3_CREATE_GUARDED:
405 if (!(p = decode_sattr3(p, &args->attrs)))
406 return 0;
407 break;
408 case NFS3_CREATE_EXCLUSIVE:
409 args->verf = p;
410 p += 2;
411 break;
412 default:
413 return 0;
414 }
415
416 return xdr_argsize_check(rqstp, p);
417 }
418 int
419 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, u32 *p,
420 struct nfsd3_createargs *args)
421 {
422 if (!(p = decode_fh(p, &args->fh))
423 || !(p = decode_filename(p, &args->name, &args->len))
424 || !(p = decode_sattr3(p, &args->attrs)))
425 return 0;
426
427 return xdr_argsize_check(rqstp, p);
428 }
429
430 int
431 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p,
432 struct nfsd3_symlinkargs *args)
433 {
434 unsigned int len;
435 int avail;
436 char *old, *new;
437 struct kvec *vec;
438
439 if (!(p = decode_fh(p, &args->ffh))
440 || !(p = decode_filename(p, &args->fname, &args->flen))
441 || !(p = decode_sattr3(p, &args->attrs))
442 )
443 return 0;
444 /* now decode the pathname, which might be larger than the first page.
445 * As we have to check for nul's anyway, we copy it into a new page
446 * This page appears in the rq_res.pages list, but as pages_len is always
447 * 0, it won't get in the way
448 */
449 svc_take_page(rqstp);
450 len = ntohl(*p++);
451 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
452 return 0;
453 args->tname = new = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
454 args->tlen = len;
455 /* first copy and check from the first page */
456 old = (char*)p;
457 vec = &rqstp->rq_arg.head[0];
458 avail = vec->iov_len - (old - (char*)vec->iov_base);
459 while (len && avail && *old) {
460 *new++ = *old++;
461 len--;
462 avail--;
463 }
464 /* now copy next page if there is one */
465 if (len && !avail && rqstp->rq_arg.page_len) {
466 avail = rqstp->rq_arg.page_len;
467 if (avail > PAGE_SIZE) avail = PAGE_SIZE;
468 old = page_address(rqstp->rq_arg.pages[0]);
469 }
470 while (len && avail && *old) {
471 *new++ = *old++;
472 len--;
473 avail--;
474 }
475 *new = '\0';
476 if (len)
477 return 0;
478
479 return 1;
480 }
481
482 int
483 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, u32 *p,
484 struct nfsd3_mknodargs *args)
485 {
486 if (!(p = decode_fh(p, &args->fh))
487 || !(p = decode_filename(p, &args->name, &args->len)))
488 return 0;
489
490 args->ftype = ntohl(*p++);
491
492 if (args->ftype == NF3BLK || args->ftype == NF3CHR
493 || args->ftype == NF3SOCK || args->ftype == NF3FIFO) {
494 if (!(p = decode_sattr3(p, &args->attrs)))
495 return 0;
496 }
497
498 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
499 args->major = ntohl(*p++);
500 args->minor = ntohl(*p++);
501 }
502
503 return xdr_argsize_check(rqstp, p);
504 }
505
506 int
507 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, u32 *p,
508 struct nfsd3_renameargs *args)
509 {
510 if (!(p = decode_fh(p, &args->ffh))
511 || !(p = decode_filename(p, &args->fname, &args->flen))
512 || !(p = decode_fh(p, &args->tfh))
513 || !(p = decode_filename(p, &args->tname, &args->tlen)))
514 return 0;
515
516 return xdr_argsize_check(rqstp, p);
517 }
518
519 int
520 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p,
521 struct nfsd3_readlinkargs *args)
522 {
523 if (!(p = decode_fh(p, &args->fh)))
524 return 0;
525 svc_take_page(rqstp);
526 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
527
528 return xdr_argsize_check(rqstp, p);
529 }
530
531 int
532 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, u32 *p,
533 struct nfsd3_linkargs *args)
534 {
535 if (!(p = decode_fh(p, &args->ffh))
536 || !(p = decode_fh(p, &args->tfh))
537 || !(p = decode_filename(p, &args->tname, &args->tlen)))
538 return 0;
539
540 return xdr_argsize_check(rqstp, p);
541 }
542
543 int
544 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p,
545 struct nfsd3_readdirargs *args)
546 {
547 if (!(p = decode_fh(p, &args->fh)))
548 return 0;
549 p = xdr_decode_hyper(p, &args->cookie);
550 args->verf = p; p += 2;
551 args->dircount = ~0;
552 args->count = ntohl(*p++);
553
554 if (args->count > PAGE_SIZE)
555 args->count = PAGE_SIZE;
556
557 svc_take_page(rqstp);
558 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
559
560 return xdr_argsize_check(rqstp, p);
561 }
562
563 int
564 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p,
565 struct nfsd3_readdirargs *args)
566 {
567 int len, pn;
568
569 if (!(p = decode_fh(p, &args->fh)))
570 return 0;
571 p = xdr_decode_hyper(p, &args->cookie);
572 args->verf = p; p += 2;
573 args->dircount = ntohl(*p++);
574 args->count = ntohl(*p++);
575
576 len = (args->count > NFSSVC_MAXBLKSIZE) ? NFSSVC_MAXBLKSIZE :
577 args->count;
578 args->count = len;
579
580 while (len > 0) {
581 pn = rqstp->rq_resused;
582 svc_take_page(rqstp);
583 if (!args->buffer)
584 args->buffer = page_address(rqstp->rq_respages[pn]);
585 len -= PAGE_SIZE;
586 }
587
588 return xdr_argsize_check(rqstp, p);
589 }
590
591 int
592 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, u32 *p,
593 struct nfsd3_commitargs *args)
594 {
595 if (!(p = decode_fh(p, &args->fh)))
596 return 0;
597 p = xdr_decode_hyper(p, &args->offset);
598 args->count = ntohl(*p++);
599
600 return xdr_argsize_check(rqstp, p);
601 }
602
603 /*
604 * XDR encode functions
605 */
606 /*
607 * There must be an encoding function for void results so svc_process
608 * will work properly.
609 */
610 int
611 nfs3svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
612 {
613 return xdr_ressize_check(rqstp, p);
614 }
615
616 /* GETATTR */
617 int
618 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
619 struct nfsd3_attrstat *resp)
620 {
621 if (resp->status == 0)
622 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
623 return xdr_ressize_check(rqstp, p);
624 }
625
626 /* SETATTR, REMOVE, RMDIR */
627 int
628 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, u32 *p,
629 struct nfsd3_attrstat *resp)
630 {
631 p = encode_wcc_data(rqstp, p, &resp->fh);
632 return xdr_ressize_check(rqstp, p);
633 }
634
635 /* LOOKUP */
636 int
637 nfs3svc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
638 struct nfsd3_diropres *resp)
639 {
640 if (resp->status == 0) {
641 p = encode_fh(p, &resp->fh);
642 p = encode_post_op_attr(rqstp, p, &resp->fh);
643 }
644 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
645 return xdr_ressize_check(rqstp, p);
646 }
647
648 /* ACCESS */
649 int
650 nfs3svc_encode_accessres(struct svc_rqst *rqstp, u32 *p,
651 struct nfsd3_accessres *resp)
652 {
653 p = encode_post_op_attr(rqstp, p, &resp->fh);
654 if (resp->status == 0)
655 *p++ = htonl(resp->access);
656 return xdr_ressize_check(rqstp, p);
657 }
658
659 /* READLINK */
660 int
661 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p,
662 struct nfsd3_readlinkres *resp)
663 {
664 p = encode_post_op_attr(rqstp, p, &resp->fh);
665 if (resp->status == 0) {
666 *p++ = htonl(resp->len);
667 xdr_ressize_check(rqstp, p);
668 rqstp->rq_res.page_len = resp->len;
669 if (resp->len & 3) {
670 /* need to pad the tail */
671 rqstp->rq_restailpage = 0;
672 rqstp->rq_res.tail[0].iov_base = p;
673 *p = 0;
674 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
675 }
676 return 1;
677 } else
678 return xdr_ressize_check(rqstp, p);
679 }
680
681 /* READ */
682 int
683 nfs3svc_encode_readres(struct svc_rqst *rqstp, u32 *p,
684 struct nfsd3_readres *resp)
685 {
686 p = encode_post_op_attr(rqstp, p, &resp->fh);
687 if (resp->status == 0) {
688 *p++ = htonl(resp->count);
689 *p++ = htonl(resp->eof);
690 *p++ = htonl(resp->count); /* xdr opaque count */
691 xdr_ressize_check(rqstp, p);
692 /* now update rqstp->rq_res to reflect data aswell */
693 rqstp->rq_res.page_len = resp->count;
694 if (resp->count & 3) {
695 /* need to pad the tail */
696 rqstp->rq_restailpage = 0;
697 rqstp->rq_res.tail[0].iov_base = p;
698 *p = 0;
699 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
700 }
701 return 1;
702 } else
703 return xdr_ressize_check(rqstp, p);
704 }
705
706 /* WRITE */
707 int
708 nfs3svc_encode_writeres(struct svc_rqst *rqstp, u32 *p,
709 struct nfsd3_writeres *resp)
710 {
711 p = encode_wcc_data(rqstp, p, &resp->fh);
712 if (resp->status == 0) {
713 *p++ = htonl(resp->count);
714 *p++ = htonl(resp->committed);
715 *p++ = htonl(nfssvc_boot.tv_sec);
716 *p++ = htonl(nfssvc_boot.tv_usec);
717 }
718 return xdr_ressize_check(rqstp, p);
719 }
720
721 /* CREATE, MKDIR, SYMLINK, MKNOD */
722 int
723 nfs3svc_encode_createres(struct svc_rqst *rqstp, u32 *p,
724 struct nfsd3_diropres *resp)
725 {
726 if (resp->status == 0) {
727 *p++ = xdr_one;
728 p = encode_fh(p, &resp->fh);
729 p = encode_post_op_attr(rqstp, p, &resp->fh);
730 }
731 p = encode_wcc_data(rqstp, p, &resp->dirfh);
732 return xdr_ressize_check(rqstp, p);
733 }
734
735 /* RENAME */
736 int
737 nfs3svc_encode_renameres(struct svc_rqst *rqstp, u32 *p,
738 struct nfsd3_renameres *resp)
739 {
740 p = encode_wcc_data(rqstp, p, &resp->ffh);
741 p = encode_wcc_data(rqstp, p, &resp->tfh);
742 return xdr_ressize_check(rqstp, p);
743 }
744
745 /* LINK */
746 int
747 nfs3svc_encode_linkres(struct svc_rqst *rqstp, u32 *p,
748 struct nfsd3_linkres *resp)
749 {
750 p = encode_post_op_attr(rqstp, p, &resp->fh);
751 p = encode_wcc_data(rqstp, p, &resp->tfh);
752 return xdr_ressize_check(rqstp, p);
753 }
754
755 /* READDIR */
756 int
757 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
758 struct nfsd3_readdirres *resp)
759 {
760 p = encode_post_op_attr(rqstp, p, &resp->fh);
761
762 if (resp->status == 0) {
763 /* stupid readdir cookie */
764 memcpy(p, resp->verf, 8); p += 2;
765 xdr_ressize_check(rqstp, p);
766 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
767 return 1; /*No room for trailer */
768 rqstp->rq_res.page_len = (resp->count) << 2;
769
770 /* add the 'tail' to the end of the 'head' page - page 0. */
771 rqstp->rq_restailpage = 0;
772 rqstp->rq_res.tail[0].iov_base = p;
773 *p++ = 0; /* no more entries */
774 *p++ = htonl(resp->common.err == nfserr_eof);
775 rqstp->rq_res.tail[0].iov_len = 2<<2;
776 return 1;
777 } else
778 return xdr_ressize_check(rqstp, p);
779 }
780
781 static inline u32 *
782 encode_entry_baggage(struct nfsd3_readdirres *cd, u32 *p, const char *name,
783 int namlen, ino_t ino)
784 {
785 *p++ = xdr_one; /* mark entry present */
786 p = xdr_encode_hyper(p, ino); /* file id */
787 p = xdr_encode_array(p, name, namlen);/* name length & name */
788
789 cd->offset = p; /* remember pointer */
790 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
791
792 return p;
793 }
794
795 static inline u32 *
796 encode_entryplus_baggage(struct nfsd3_readdirres *cd, u32 *p,
797 struct svc_fh *fhp)
798 {
799 p = encode_post_op_attr(cd->rqstp, p, fhp);
800 *p++ = xdr_one; /* yes, a file handle follows */
801 p = encode_fh(p, fhp);
802 fh_put(fhp);
803 return p;
804 }
805
806 static int
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 int rv = 0;
813
814 dparent = cd->fh.fh_dentry;
815 exp = cd->fh.fh_export;
816
817 fh_init(fhp, NFS3_FHSIZE);
818 if (isdotent(name, namlen)) {
819 if (namlen == 2) {
820 dchild = dget_parent(dparent);
821 if (dchild == dparent) {
822 /* filesystem root - cannot return filehandle for ".." */
823 dput(dchild);
824 return 1;
825 }
826 } else
827 dchild = dget(dparent);
828 } else
829 dchild = lookup_one_len(name, dparent, namlen);
830 if (IS_ERR(dchild))
831 return 1;
832 if (d_mountpoint(dchild) ||
833 fh_compose(fhp, exp, dchild, &cd->fh) != 0 ||
834 !dchild->d_inode)
835 rv = 1;
836 dput(dchild);
837 return rv;
838 }
839
840 /*
841 * Encode a directory entry. This one works for both normal readdir
842 * and readdirplus.
843 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
844 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
845 *
846 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
847 * file handle.
848 */
849
850 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
851 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
852 static int
853 encode_entry(struct readdir_cd *ccd, const char *name,
854 int namlen, off_t offset, ino_t ino, unsigned int d_type, int plus)
855 {
856 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
857 common);
858 u32 *p = cd->buffer;
859 caddr_t curr_page_addr = NULL;
860 int pn; /* current page number */
861 int slen; /* string (name) length */
862 int elen; /* estimated entry length in words */
863 int num_entry_words = 0; /* actual number of words */
864
865 if (cd->offset) {
866 u64 offset64 = offset;
867
868 if (unlikely(cd->offset1)) {
869 /* we ended up with offset on a page boundary */
870 *cd->offset = htonl(offset64 >> 32);
871 *cd->offset1 = htonl(offset64 & 0xffffffff);
872 cd->offset1 = NULL;
873 } else {
874 xdr_encode_hyper(cd->offset, (u64) offset);
875 }
876 }
877
878 /*
879 dprintk("encode_entry(%.*s @%ld%s)\n",
880 namlen, name, (long) offset, plus? " plus" : "");
881 */
882
883 /* truncate filename if too long */
884 if (namlen > NFS3_MAXNAMLEN)
885 namlen = NFS3_MAXNAMLEN;
886
887 slen = XDR_QUADLEN(namlen);
888 elen = slen + NFS3_ENTRY_BAGGAGE
889 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
890
891 if (cd->buflen < elen) {
892 cd->common.err = nfserr_toosmall;
893 return -EINVAL;
894 }
895
896 /* determine which page in rq_respages[] we are currently filling */
897 for (pn=1; pn < cd->rqstp->rq_resused; pn++) {
898 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
899
900 if (((caddr_t)cd->buffer >= curr_page_addr) &&
901 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
902 break;
903 }
904
905 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
906 /* encode entry in current page */
907
908 p = encode_entry_baggage(cd, p, name, namlen, ino);
909
910 /* throw in readdirplus baggage */
911 if (plus) {
912 struct svc_fh fh;
913
914 if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
915 *p++ = 0;
916 *p++ = 0;
917 } else
918 p = encode_entryplus_baggage(cd, p, &fh);
919 }
920 num_entry_words = p - cd->buffer;
921 } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
922 /* temporarily encode entry into next page, then move back to
923 * current and next page in rq_respages[] */
924 u32 *p1, *tmp;
925 int len1, len2;
926
927 /* grab next page for temporary storage of entry */
928 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
929
930 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
931
932 /* throw in readdirplus baggage */
933 if (plus) {
934 struct svc_fh fh;
935
936 if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
937 /* zero out the filehandle */
938 *p1++ = 0;
939 *p1++ = 0;
940 } else
941 p1 = encode_entryplus_baggage(cd, p1, &fh);
942 }
943
944 /* determine entry word length and lengths to go in pages */
945 num_entry_words = p1 - tmp;
946 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
947 if ((num_entry_words << 2) < len1) {
948 /* the actual number of words in the entry is less
949 * than elen and can still fit in the current page
950 */
951 memmove(p, tmp, num_entry_words << 2);
952 p += num_entry_words;
953
954 /* update offset */
955 cd->offset = cd->buffer + (cd->offset - tmp);
956 } else {
957 unsigned int offset_r = (cd->offset - tmp) << 2;
958
959 /* update pointer to offset location.
960 * This is a 64bit quantity, so we need to
961 * deal with 3 cases:
962 * - entirely in first page
963 * - entirely in second page
964 * - 4 bytes in each page
965 */
966 if (offset_r + 8 <= len1) {
967 cd->offset = p + (cd->offset - tmp);
968 } else if (offset_r >= len1) {
969 cd->offset -= len1 >> 2;
970 } else {
971 /* sitting on the fence */
972 BUG_ON(offset_r != len1 - 4);
973 cd->offset = p + (cd->offset - tmp);
974 cd->offset1 = tmp;
975 }
976
977 len2 = (num_entry_words << 2) - len1;
978
979 /* move from temp page to current and next pages */
980 memmove(p, tmp, len1);
981 memmove(tmp, (caddr_t)tmp+len1, len2);
982
983 p = tmp + (len2 >> 2);
984 }
985 }
986 else {
987 cd->common.err = nfserr_toosmall;
988 return -EINVAL;
989 }
990
991 cd->buflen -= num_entry_words;
992 cd->buffer = p;
993 cd->common.err = nfs_ok;
994 return 0;
995
996 }
997
998 int
999 nfs3svc_encode_entry(struct readdir_cd *cd, const char *name,
1000 int namlen, loff_t offset, ino_t ino, unsigned int d_type)
1001 {
1002 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1003 }
1004
1005 int
1006 nfs3svc_encode_entry_plus(struct readdir_cd *cd, const char *name,
1007 int namlen, loff_t offset, ino_t ino, unsigned int d_type)
1008 {
1009 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1010 }
1011
1012 /* FSSTAT */
1013 int
1014 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, u32 *p,
1015 struct nfsd3_fsstatres *resp)
1016 {
1017 struct kstatfs *s = &resp->stats;
1018 u64 bs = s->f_bsize;
1019
1020 *p++ = xdr_zero; /* no post_op_attr */
1021
1022 if (resp->status == 0) {
1023 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1024 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1025 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1026 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1027 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1028 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1029 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1030 }
1031 return xdr_ressize_check(rqstp, p);
1032 }
1033
1034 /* FSINFO */
1035 int
1036 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, u32 *p,
1037 struct nfsd3_fsinfores *resp)
1038 {
1039 *p++ = xdr_zero; /* no post_op_attr */
1040
1041 if (resp->status == 0) {
1042 *p++ = htonl(resp->f_rtmax);
1043 *p++ = htonl(resp->f_rtpref);
1044 *p++ = htonl(resp->f_rtmult);
1045 *p++ = htonl(resp->f_wtmax);
1046 *p++ = htonl(resp->f_wtpref);
1047 *p++ = htonl(resp->f_wtmult);
1048 *p++ = htonl(resp->f_dtpref);
1049 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1050 *p++ = xdr_one;
1051 *p++ = xdr_zero;
1052 *p++ = htonl(resp->f_properties);
1053 }
1054
1055 return xdr_ressize_check(rqstp, p);
1056 }
1057
1058 /* PATHCONF */
1059 int
1060 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, u32 *p,
1061 struct nfsd3_pathconfres *resp)
1062 {
1063 *p++ = xdr_zero; /* no post_op_attr */
1064
1065 if (resp->status == 0) {
1066 *p++ = htonl(resp->p_link_max);
1067 *p++ = htonl(resp->p_name_max);
1068 *p++ = htonl(resp->p_no_trunc);
1069 *p++ = htonl(resp->p_chown_restricted);
1070 *p++ = htonl(resp->p_case_insensitive);
1071 *p++ = htonl(resp->p_case_preserving);
1072 }
1073
1074 return xdr_ressize_check(rqstp, p);
1075 }
1076
1077 /* COMMIT */
1078 int
1079 nfs3svc_encode_commitres(struct svc_rqst *rqstp, u32 *p,
1080 struct nfsd3_commitres *resp)
1081 {
1082 p = encode_wcc_data(rqstp, p, &resp->fh);
1083 /* Write verifier */
1084 if (resp->status == 0) {
1085 *p++ = htonl(nfssvc_boot.tv_sec);
1086 *p++ = htonl(nfssvc_boot.tv_usec);
1087 }
1088 return xdr_ressize_check(rqstp, p);
1089 }
1090
1091 /*
1092 * XDR release functions
1093 */
1094 int
1095 nfs3svc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
1096 struct nfsd3_attrstat *resp)
1097 {
1098 fh_put(&resp->fh);
1099 return 1;
1100 }
1101
1102 int
1103 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, u32 *p,
1104 struct nfsd3_fhandle_pair *resp)
1105 {
1106 fh_put(&resp->fh1);
1107 fh_put(&resp->fh2);
1108 return 1;
1109 }
Linux with added FPC-III support