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[ARM] 3192/1: Remove gpio_isr_line_clear() API from IXP4xx
[linux-2.6.git] / fs / nfsd / nfs3xdr.c
blob9147b8524d05262bd9f28b77c0e7636854367f09
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 < hdr ||
370 rqstp->rq_arg.len - hdr < len)
371 return 0;
372
373 args->vec[0].iov_base = (void*)p;
374 args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
375
376 if (len > NFSSVC_MAXBLKSIZE)
377 len = NFSSVC_MAXBLKSIZE;
378 v= 0;
379 while (len > args->vec[v].iov_len) {
380 len -= args->vec[v].iov_len;
381 v++;
382 args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]);
383 args->vec[v].iov_len = PAGE_SIZE;
384 }
385 args->vec[v].iov_len = len;
386 args->vlen = v+1;
387
388 return args->count == args->len && args->vec[0].iov_len > 0;
389 }
390
391 int
392 nfs3svc_decode_createargs(struct svc_rqst *rqstp, u32 *p,
393 struct nfsd3_createargs *args)
394 {
395 if (!(p = decode_fh(p, &args->fh))
396 || !(p = decode_filename(p, &args->name, &args->len)))
397 return 0;
398
399 switch (args->createmode = ntohl(*p++)) {
400 case NFS3_CREATE_UNCHECKED:
401 case NFS3_CREATE_GUARDED:
402 if (!(p = decode_sattr3(p, &args->attrs)))
403 return 0;
404 break;
405 case NFS3_CREATE_EXCLUSIVE:
406 args->verf = p;
407 p += 2;
408 break;
409 default:
410 return 0;
411 }
412
413 return xdr_argsize_check(rqstp, p);
414 }
415 int
416 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, u32 *p,
417 struct nfsd3_createargs *args)
418 {
419 if (!(p = decode_fh(p, &args->fh))
420 || !(p = decode_filename(p, &args->name, &args->len))
421 || !(p = decode_sattr3(p, &args->attrs)))
422 return 0;
423
424 return xdr_argsize_check(rqstp, p);
425 }
426
427 int
428 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p,
429 struct nfsd3_symlinkargs *args)
430 {
431 unsigned int len;
432 int avail;
433 char *old, *new;
434 struct kvec *vec;
435
436 if (!(p = decode_fh(p, &args->ffh))
437 || !(p = decode_filename(p, &args->fname, &args->flen))
438 || !(p = decode_sattr3(p, &args->attrs))
439 )
440 return 0;
441 /* now decode the pathname, which might be larger than the first page.
442 * As we have to check for nul's anyway, we copy it into a new page
443 * This page appears in the rq_res.pages list, but as pages_len is always
444 * 0, it won't get in the way
445 */
446 svc_take_page(rqstp);
447 len = ntohl(*p++);
448 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
449 return 0;
450 args->tname = new = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
451 args->tlen = len;
452 /* first copy and check from the first page */
453 old = (char*)p;
454 vec = &rqstp->rq_arg.head[0];
455 avail = vec->iov_len - (old - (char*)vec->iov_base);
456 while (len && avail && *old) {
457 *new++ = *old++;
458 len--;
459 avail--;
460 }
461 /* now copy next page if there is one */
462 if (len && !avail && rqstp->rq_arg.page_len) {
463 avail = rqstp->rq_arg.page_len;
464 if (avail > PAGE_SIZE) avail = PAGE_SIZE;
465 old = page_address(rqstp->rq_arg.pages[0]);
466 }
467 while (len && avail && *old) {
468 *new++ = *old++;
469 len--;
470 avail--;
471 }
472 *new = '\0';
473 if (len)
474 return 0;
475
476 return 1;
477 }
478
479 int
480 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, u32 *p,
481 struct nfsd3_mknodargs *args)
482 {
483 if (!(p = decode_fh(p, &args->fh))
484 || !(p = decode_filename(p, &args->name, &args->len)))
485 return 0;
486
487 args->ftype = ntohl(*p++);
488
489 if (args->ftype == NF3BLK || args->ftype == NF3CHR
490 || args->ftype == NF3SOCK || args->ftype == NF3FIFO) {
491 if (!(p = decode_sattr3(p, &args->attrs)))
492 return 0;
493 }
494
495 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
496 args->major = ntohl(*p++);
497 args->minor = ntohl(*p++);
498 }
499
500 return xdr_argsize_check(rqstp, p);
501 }
502
503 int
504 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, u32 *p,
505 struct nfsd3_renameargs *args)
506 {
507 if (!(p = decode_fh(p, &args->ffh))
508 || !(p = decode_filename(p, &args->fname, &args->flen))
509 || !(p = decode_fh(p, &args->tfh))
510 || !(p = decode_filename(p, &args->tname, &args->tlen)))
511 return 0;
512
513 return xdr_argsize_check(rqstp, p);
514 }
515
516 int
517 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p,
518 struct nfsd3_readlinkargs *args)
519 {
520 if (!(p = decode_fh(p, &args->fh)))
521 return 0;
522 svc_take_page(rqstp);
523 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
524
525 return xdr_argsize_check(rqstp, p);
526 }
527
528 int
529 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, u32 *p,
530 struct nfsd3_linkargs *args)
531 {
532 if (!(p = decode_fh(p, &args->ffh))
533 || !(p = decode_fh(p, &args->tfh))
534 || !(p = decode_filename(p, &args->tname, &args->tlen)))
535 return 0;
536
537 return xdr_argsize_check(rqstp, p);
538 }
539
540 int
541 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p,
542 struct nfsd3_readdirargs *args)
543 {
544 if (!(p = decode_fh(p, &args->fh)))
545 return 0;
546 p = xdr_decode_hyper(p, &args->cookie);
547 args->verf = p; p += 2;
548 args->dircount = ~0;
549 args->count = ntohl(*p++);
550
551 if (args->count > PAGE_SIZE)
552 args->count = PAGE_SIZE;
553
554 svc_take_page(rqstp);
555 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
556
557 return xdr_argsize_check(rqstp, p);
558 }
559
560 int
561 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p,
562 struct nfsd3_readdirargs *args)
563 {
564 int len, pn;
565
566 if (!(p = decode_fh(p, &args->fh)))
567 return 0;
568 p = xdr_decode_hyper(p, &args->cookie);
569 args->verf = p; p += 2;
570 args->dircount = ntohl(*p++);
571 args->count = ntohl(*p++);
572
573 len = (args->count > NFSSVC_MAXBLKSIZE) ? NFSSVC_MAXBLKSIZE :
574 args->count;
575 args->count = len;
576
577 while (len > 0) {
578 pn = rqstp->rq_resused;
579 svc_take_page(rqstp);
580 if (!args->buffer)
581 args->buffer = page_address(rqstp->rq_respages[pn]);
582 len -= PAGE_SIZE;
583 }
584
585 return xdr_argsize_check(rqstp, p);
586 }
587
588 int
589 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, u32 *p,
590 struct nfsd3_commitargs *args)
591 {
592 if (!(p = decode_fh(p, &args->fh)))
593 return 0;
594 p = xdr_decode_hyper(p, &args->offset);
595 args->count = ntohl(*p++);
596
597 return xdr_argsize_check(rqstp, p);
598 }
599
600 /*
601 * XDR encode functions
602 */
603 /*
604 * There must be an encoding function for void results so svc_process
605 * will work properly.
606 */
607 int
608 nfs3svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
609 {
610 return xdr_ressize_check(rqstp, p);
611 }
612
613 /* GETATTR */
614 int
615 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
616 struct nfsd3_attrstat *resp)
617 {
618 if (resp->status == 0)
619 p = encode_fattr3(rqstp, p, &resp->fh);
620 return xdr_ressize_check(rqstp, p);
621 }
622
623 /* SETATTR, REMOVE, RMDIR */
624 int
625 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, u32 *p,
626 struct nfsd3_attrstat *resp)
627 {
628 p = encode_wcc_data(rqstp, p, &resp->fh);
629 return xdr_ressize_check(rqstp, p);
630 }
631
632 /* LOOKUP */
633 int
634 nfs3svc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
635 struct nfsd3_diropres *resp)
636 {
637 if (resp->status == 0) {
638 p = encode_fh(p, &resp->fh);
639 p = encode_post_op_attr(rqstp, p, &resp->fh);
640 }
641 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
642 return xdr_ressize_check(rqstp, p);
643 }
644
645 /* ACCESS */
646 int
647 nfs3svc_encode_accessres(struct svc_rqst *rqstp, u32 *p,
648 struct nfsd3_accessres *resp)
649 {
650 p = encode_post_op_attr(rqstp, p, &resp->fh);
651 if (resp->status == 0)
652 *p++ = htonl(resp->access);
653 return xdr_ressize_check(rqstp, p);
654 }
655
656 /* READLINK */
657 int
658 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p,
659 struct nfsd3_readlinkres *resp)
660 {
661 p = encode_post_op_attr(rqstp, p, &resp->fh);
662 if (resp->status == 0) {
663 *p++ = htonl(resp->len);
664 xdr_ressize_check(rqstp, p);
665 rqstp->rq_res.page_len = resp->len;
666 if (resp->len & 3) {
667 /* need to pad the tail */
668 rqstp->rq_restailpage = 0;
669 rqstp->rq_res.tail[0].iov_base = p;
670 *p = 0;
671 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
672 }
673 return 1;
674 } else
675 return xdr_ressize_check(rqstp, p);
676 }
677
678 /* READ */
679 int
680 nfs3svc_encode_readres(struct svc_rqst *rqstp, u32 *p,
681 struct nfsd3_readres *resp)
682 {
683 p = encode_post_op_attr(rqstp, p, &resp->fh);
684 if (resp->status == 0) {
685 *p++ = htonl(resp->count);
686 *p++ = htonl(resp->eof);
687 *p++ = htonl(resp->count); /* xdr opaque count */
688 xdr_ressize_check(rqstp, p);
689 /* now update rqstp->rq_res to reflect data aswell */
690 rqstp->rq_res.page_len = resp->count;
691 if (resp->count & 3) {
692 /* need to pad the tail */
693 rqstp->rq_restailpage = 0;
694 rqstp->rq_res.tail[0].iov_base = p;
695 *p = 0;
696 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
697 }
698 return 1;
699 } else
700 return xdr_ressize_check(rqstp, p);
701 }
702
703 /* WRITE */
704 int
705 nfs3svc_encode_writeres(struct svc_rqst *rqstp, u32 *p,
706 struct nfsd3_writeres *resp)
707 {
708 p = encode_wcc_data(rqstp, p, &resp->fh);
709 if (resp->status == 0) {
710 *p++ = htonl(resp->count);
711 *p++ = htonl(resp->committed);
712 *p++ = htonl(nfssvc_boot.tv_sec);
713 *p++ = htonl(nfssvc_boot.tv_usec);
714 }
715 return xdr_ressize_check(rqstp, p);
716 }
717
718 /* CREATE, MKDIR, SYMLINK, MKNOD */
719 int
720 nfs3svc_encode_createres(struct svc_rqst *rqstp, u32 *p,
721 struct nfsd3_diropres *resp)
722 {
723 if (resp->status == 0) {
724 *p++ = xdr_one;
725 p = encode_fh(p, &resp->fh);
726 p = encode_post_op_attr(rqstp, p, &resp->fh);
727 }
728 p = encode_wcc_data(rqstp, p, &resp->dirfh);
729 return xdr_ressize_check(rqstp, p);
730 }
731
732 /* RENAME */
733 int
734 nfs3svc_encode_renameres(struct svc_rqst *rqstp, u32 *p,
735 struct nfsd3_renameres *resp)
736 {
737 p = encode_wcc_data(rqstp, p, &resp->ffh);
738 p = encode_wcc_data(rqstp, p, &resp->tfh);
739 return xdr_ressize_check(rqstp, p);
740 }
741
742 /* LINK */
743 int
744 nfs3svc_encode_linkres(struct svc_rqst *rqstp, u32 *p,
745 struct nfsd3_linkres *resp)
746 {
747 p = encode_post_op_attr(rqstp, p, &resp->fh);
748 p = encode_wcc_data(rqstp, p, &resp->tfh);
749 return xdr_ressize_check(rqstp, p);
750 }
751
752 /* READDIR */
753 int
754 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
755 struct nfsd3_readdirres *resp)
756 {
757 p = encode_post_op_attr(rqstp, p, &resp->fh);
758
759 if (resp->status == 0) {
760 /* stupid readdir cookie */
761 memcpy(p, resp->verf, 8); p += 2;
762 xdr_ressize_check(rqstp, p);
763 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
764 return 1; /*No room for trailer */
765 rqstp->rq_res.page_len = (resp->count) << 2;
766
767 /* add the 'tail' to the end of the 'head' page - page 0. */
768 rqstp->rq_restailpage = 0;
769 rqstp->rq_res.tail[0].iov_base = p;
770 *p++ = 0; /* no more entries */
771 *p++ = htonl(resp->common.err == nfserr_eof);
772 rqstp->rq_res.tail[0].iov_len = 2<<2;
773 return 1;
774 } else
775 return xdr_ressize_check(rqstp, p);
776 }
777
778 static inline u32 *
779 encode_entry_baggage(struct nfsd3_readdirres *cd, u32 *p, const char *name,
780 int namlen, ino_t ino)
781 {
782 *p++ = xdr_one; /* mark entry present */
783 p = xdr_encode_hyper(p, ino); /* file id */
784 p = xdr_encode_array(p, name, namlen);/* name length & name */
785
786 cd->offset = p; /* remember pointer */
787 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
788
789 return p;
790 }
791
792 static inline u32 *
793 encode_entryplus_baggage(struct nfsd3_readdirres *cd, u32 *p,
794 struct svc_fh *fhp)
795 {
796 p = encode_post_op_attr(cd->rqstp, p, fhp);
797 *p++ = xdr_one; /* yes, a file handle follows */
798 p = encode_fh(p, fhp);
799 fh_put(fhp);
800 return p;
801 }
802
803 static int
804 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
805 const char *name, int namlen)
806 {
807 struct svc_export *exp;
808 struct dentry *dparent, *dchild;
809 int rv = 0;
810
811 dparent = cd->fh.fh_dentry;
812 exp = cd->fh.fh_export;
813
814 fh_init(fhp, NFS3_FHSIZE);
815 if (isdotent(name, namlen)) {
816 if (namlen == 2) {
817 dchild = dget_parent(dparent);
818 if (dchild == dparent) {
819 /* filesystem root - cannot return filehandle for ".." */
820 dput(dchild);
821 return 1;
822 }
823 } else
824 dchild = dget(dparent);
825 } else
826 dchild = lookup_one_len(name, dparent, namlen);
827 if (IS_ERR(dchild))
828 return 1;
829 if (d_mountpoint(dchild) ||
830 fh_compose(fhp, exp, dchild, &cd->fh) != 0 ||
831 !dchild->d_inode)
832 rv = 1;
833 dput(dchild);
834 return rv;
835 }
836
837 /*
838 * Encode a directory entry. This one works for both normal readdir
839 * and readdirplus.
840 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
841 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
842 *
843 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
844 * file handle.
845 */
846
847 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
848 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
849 static int
850 encode_entry(struct readdir_cd *ccd, const char *name,
851 int namlen, off_t offset, ino_t ino, unsigned int d_type, int plus)
852 {
853 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
854 common);
855 u32 *p = cd->buffer;
856 caddr_t curr_page_addr = NULL;
857 int pn; /* current page number */
858 int slen; /* string (name) length */
859 int elen; /* estimated entry length in words */
860 int num_entry_words = 0; /* actual number of words */
861
862 if (cd->offset) {
863 u64 offset64 = offset;
864
865 if (unlikely(cd->offset1)) {
866 /* we ended up with offset on a page boundary */
867 *cd->offset = htonl(offset64 >> 32);
868 *cd->offset1 = htonl(offset64 & 0xffffffff);
869 cd->offset1 = NULL;
870 } else {
871 xdr_encode_hyper(cd->offset, (u64) offset);
872 }
873 }
874
875 /*
876 dprintk("encode_entry(%.*s @%ld%s)\n",
877 namlen, name, (long) offset, plus? " plus" : "");
878 */
879
880 /* truncate filename if too long */
881 if (namlen > NFS3_MAXNAMLEN)
882 namlen = NFS3_MAXNAMLEN;
883
884 slen = XDR_QUADLEN(namlen);
885 elen = slen + NFS3_ENTRY_BAGGAGE
886 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
887
888 if (cd->buflen < elen) {
889 cd->common.err = nfserr_toosmall;
890 return -EINVAL;
891 }
892
893 /* determine which page in rq_respages[] we are currently filling */
894 for (pn=1; pn < cd->rqstp->rq_resused; pn++) {
895 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
896
897 if (((caddr_t)cd->buffer >= curr_page_addr) &&
898 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
899 break;
900 }
901
902 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
903 /* encode entry in current page */
904
905 p = encode_entry_baggage(cd, p, name, namlen, ino);
906
907 /* throw in readdirplus baggage */
908 if (plus) {
909 struct svc_fh fh;
910
911 if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
912 *p++ = 0;
913 *p++ = 0;
914 } else
915 p = encode_entryplus_baggage(cd, p, &fh);
916 }
917 num_entry_words = p - cd->buffer;
918 } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
919 /* temporarily encode entry into next page, then move back to
920 * current and next page in rq_respages[] */
921 u32 *p1, *tmp;
922 int len1, len2;
923
924 /* grab next page for temporary storage of entry */
925 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
926
927 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
928
929 /* throw in readdirplus baggage */
930 if (plus) {
931 struct svc_fh fh;
932
933 if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
934 /* zero out the filehandle */
935 *p1++ = 0;
936 *p1++ = 0;
937 } else
938 p1 = encode_entryplus_baggage(cd, p1, &fh);
939 }
940
941 /* determine entry word length and lengths to go in pages */
942 num_entry_words = p1 - tmp;
943 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
944 if ((num_entry_words << 2) < len1) {
945 /* the actual number of words in the entry is less
946 * than elen and can still fit in the current page
947 */
948 memmove(p, tmp, num_entry_words << 2);
949 p += num_entry_words;
950
951 /* update offset */
952 cd->offset = cd->buffer + (cd->offset - tmp);
953 } else {
954 unsigned int offset_r = (cd->offset - tmp) << 2;
955
956 /* update pointer to offset location.
957 * This is a 64bit quantity, so we need to
958 * deal with 3 cases:
959 * - entirely in first page
960 * - entirely in second page
961 * - 4 bytes in each page
962 */
963 if (offset_r + 8 <= len1) {
964 cd->offset = p + (cd->offset - tmp);
965 } else if (offset_r >= len1) {
966 cd->offset -= len1 >> 2;
967 } else {
968 /* sitting on the fence */
969 BUG_ON(offset_r != len1 - 4);
970 cd->offset = p + (cd->offset - tmp);
971 cd->offset1 = tmp;
972 }
973
974 len2 = (num_entry_words << 2) - len1;
975
976 /* move from temp page to current and next pages */
977 memmove(p, tmp, len1);
978 memmove(tmp, (caddr_t)tmp+len1, len2);
979
980 p = tmp + (len2 >> 2);
981 }
982 }
983 else {
984 cd->common.err = nfserr_toosmall;
985 return -EINVAL;
986 }
987
988 cd->buflen -= num_entry_words;
989 cd->buffer = p;
990 cd->common.err = nfs_ok;
991 return 0;
992
993 }
994
995 int
996 nfs3svc_encode_entry(struct readdir_cd *cd, const char *name,
997 int namlen, loff_t offset, ino_t ino, unsigned int d_type)
998 {
999 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1000 }
1001
1002 int
1003 nfs3svc_encode_entry_plus(struct readdir_cd *cd, const char *name,
1004 int namlen, loff_t offset, ino_t ino, unsigned int d_type)
1005 {
1006 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1007 }
1008
1009 /* FSSTAT */
1010 int
1011 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, u32 *p,
1012 struct nfsd3_fsstatres *resp)
1013 {
1014 struct kstatfs *s = &resp->stats;
1015 u64 bs = s->f_bsize;
1016
1017 *p++ = xdr_zero; /* no post_op_attr */
1018
1019 if (resp->status == 0) {
1020 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1021 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1022 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1023 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1024 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1025 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1026 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1027 }
1028 return xdr_ressize_check(rqstp, p);
1029 }
1030
1031 /* FSINFO */
1032 int
1033 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, u32 *p,
1034 struct nfsd3_fsinfores *resp)
1035 {
1036 *p++ = xdr_zero; /* no post_op_attr */
1037
1038 if (resp->status == 0) {
1039 *p++ = htonl(resp->f_rtmax);
1040 *p++ = htonl(resp->f_rtpref);
1041 *p++ = htonl(resp->f_rtmult);
1042 *p++ = htonl(resp->f_wtmax);
1043 *p++ = htonl(resp->f_wtpref);
1044 *p++ = htonl(resp->f_wtmult);
1045 *p++ = htonl(resp->f_dtpref);
1046 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1047 *p++ = xdr_one;
1048 *p++ = xdr_zero;
1049 *p++ = htonl(resp->f_properties);
1050 }
1051
1052 return xdr_ressize_check(rqstp, p);
1053 }
1054
1055 /* PATHCONF */
1056 int
1057 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, u32 *p,
1058 struct nfsd3_pathconfres *resp)
1059 {
1060 *p++ = xdr_zero; /* no post_op_attr */
1061
1062 if (resp->status == 0) {
1063 *p++ = htonl(resp->p_link_max);
1064 *p++ = htonl(resp->p_name_max);
1065 *p++ = htonl(resp->p_no_trunc);
1066 *p++ = htonl(resp->p_chown_restricted);
1067 *p++ = htonl(resp->p_case_insensitive);
1068 *p++ = htonl(resp->p_case_preserving);
1069 }
1070
1071 return xdr_ressize_check(rqstp, p);
1072 }
1073
1074 /* COMMIT */
1075 int
1076 nfs3svc_encode_commitres(struct svc_rqst *rqstp, u32 *p,
1077 struct nfsd3_commitres *resp)
1078 {
1079 p = encode_wcc_data(rqstp, p, &resp->fh);
1080 /* Write verifier */
1081 if (resp->status == 0) {
1082 *p++ = htonl(nfssvc_boot.tv_sec);
1083 *p++ = htonl(nfssvc_boot.tv_usec);
1084 }
1085 return xdr_ressize_check(rqstp, p);
1086 }
1087
1088 /*
1089 * XDR release functions
1090 */
1091 int
1092 nfs3svc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
1093 struct nfsd3_attrstat *resp)
1094 {
1095 fh_put(&resp->fh);
1096 return 1;
1097 }
1098
1099 int
1100 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, u32 *p,
1101 struct nfsd3_fhandle_pair *resp)
1102 {
1103 fh_put(&resp->fh1);
1104 fh_put(&resp->fh2);
1105 return 1;
1106 }
Linus' kernel tree