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[mirror_ubuntu-artful-kernel.git] / fs / nfsd / nfs3xdr.c
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_sattr3(u32 *p, struct iattr *iap)
106 {
107 u32 tmp;
108
109 iap->ia_valid = 0;
110
111 if (*p++) {
112 iap->ia_valid |= ATTR_MODE;
113 iap->ia_mode = ntohl(*p++);
114 }
115 if (*p++) {
116 iap->ia_valid |= ATTR_UID;
117 iap->ia_uid = ntohl(*p++);
118 }
119 if (*p++) {
120 iap->ia_valid |= ATTR_GID;
121 iap->ia_gid = ntohl(*p++);
122 }
123 if (*p++) {
124 u64 newsize;
125
126 iap->ia_valid |= ATTR_SIZE;
127 p = xdr_decode_hyper(p, &newsize);
128 if (newsize <= NFS_OFFSET_MAX)
129 iap->ia_size = newsize;
130 else
131 iap->ia_size = NFS_OFFSET_MAX;
132 }
133 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
134 iap->ia_valid |= ATTR_ATIME;
135 } else if (tmp == 2) { /* set to client time */
136 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
137 iap->ia_atime.tv_sec = ntohl(*p++);
138 iap->ia_atime.tv_nsec = ntohl(*p++);
139 }
140 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
141 iap->ia_valid |= ATTR_MTIME;
142 } else if (tmp == 2) { /* set to client time */
143 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
144 iap->ia_mtime.tv_sec = ntohl(*p++);
145 iap->ia_mtime.tv_nsec = ntohl(*p++);
146 }
147 return p;
148 }
149
150 static inline u32 *
151 encode_fattr3(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
152 {
153 struct vfsmount *mnt = fhp->fh_export->ex_mnt;
154 struct dentry *dentry = fhp->fh_dentry;
155 struct kstat stat;
156 struct timespec time;
157
158 vfs_getattr(mnt, dentry, &stat);
159
160 *p++ = htonl(nfs3_ftypes[(stat.mode & S_IFMT) >> 12]);
161 *p++ = htonl((u32) stat.mode);
162 *p++ = htonl((u32) stat.nlink);
163 *p++ = htonl((u32) nfsd_ruid(rqstp, stat.uid));
164 *p++ = htonl((u32) nfsd_rgid(rqstp, stat.gid));
165 if (S_ISLNK(stat.mode) && stat.size > NFS3_MAXPATHLEN) {
166 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
167 } else {
168 p = xdr_encode_hyper(p, (u64) stat.size);
169 }
170 p = xdr_encode_hyper(p, ((u64)stat.blocks) << 9);
171 *p++ = htonl((u32) MAJOR(stat.rdev));
172 *p++ = htonl((u32) MINOR(stat.rdev));
173 if (is_fsid(fhp, rqstp->rq_reffh))
174 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
175 else
176 p = xdr_encode_hyper(p, (u64) huge_encode_dev(stat.dev));
177 p = xdr_encode_hyper(p, (u64) stat.ino);
178 p = encode_time3(p, &stat.atime);
179 lease_get_mtime(dentry->d_inode, &time);
180 p = encode_time3(p, &time);
181 p = encode_time3(p, &stat.ctime);
182
183 return p;
184 }
185
186 static inline u32 *
187 encode_saved_post_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
188 {
189 struct inode *inode = fhp->fh_dentry->d_inode;
190
191 /* Attributes to follow */
192 *p++ = xdr_one;
193
194 *p++ = htonl(nfs3_ftypes[(fhp->fh_post_mode & S_IFMT) >> 12]);
195 *p++ = htonl((u32) fhp->fh_post_mode);
196 *p++ = htonl((u32) fhp->fh_post_nlink);
197 *p++ = htonl((u32) nfsd_ruid(rqstp, fhp->fh_post_uid));
198 *p++ = htonl((u32) nfsd_rgid(rqstp, fhp->fh_post_gid));
199 if (S_ISLNK(fhp->fh_post_mode) && fhp->fh_post_size > NFS3_MAXPATHLEN) {
200 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
201 } else {
202 p = xdr_encode_hyper(p, (u64) fhp->fh_post_size);
203 }
204 p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9);
205 *p++ = fhp->fh_post_rdev[0];
206 *p++ = fhp->fh_post_rdev[1];
207 if (is_fsid(fhp, rqstp->rq_reffh))
208 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
209 else
210 p = xdr_encode_hyper(p, (u64)huge_encode_dev(inode->i_sb->s_dev));
211 p = xdr_encode_hyper(p, (u64) inode->i_ino);
212 p = encode_time3(p, &fhp->fh_post_atime);
213 p = encode_time3(p, &fhp->fh_post_mtime);
214 p = encode_time3(p, &fhp->fh_post_ctime);
215
216 return p;
217 }
218
219 /*
220 * Encode post-operation attributes.
221 * The inode may be NULL if the call failed because of a stale file
222 * handle. In this case, no attributes are returned.
223 */
224 static u32 *
225 encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
226 {
227 struct dentry *dentry = fhp->fh_dentry;
228 if (dentry && dentry->d_inode != NULL) {
229 *p++ = xdr_one; /* attributes follow */
230 return encode_fattr3(rqstp, p, fhp);
231 }
232 *p++ = xdr_zero;
233 return p;
234 }
235
236 /*
237 * Enocde weak cache consistency data
238 */
239 static u32 *
240 encode_wcc_data(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
241 {
242 struct dentry *dentry = fhp->fh_dentry;
243
244 if (dentry && dentry->d_inode && fhp->fh_post_saved) {
245 if (fhp->fh_pre_saved) {
246 *p++ = xdr_one;
247 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
248 p = encode_time3(p, &fhp->fh_pre_mtime);
249 p = encode_time3(p, &fhp->fh_pre_ctime);
250 } else {
251 *p++ = xdr_zero;
252 }
253 return encode_saved_post_attr(rqstp, p, fhp);
254 }
255 /* no pre- or post-attrs */
256 *p++ = xdr_zero;
257 return encode_post_op_attr(rqstp, p, fhp);
258 }
259
260
261 /*
262 * XDR decode functions
263 */
264 int
265 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct nfsd_fhandle *args)
266 {
267 if (!(p = decode_fh(p, &args->fh)))
268 return 0;
269 return xdr_argsize_check(rqstp, p);
270 }
271
272 int
273 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p,
274 struct nfsd3_sattrargs *args)
275 {
276 if (!(p = decode_fh(p, &args->fh))
277 || !(p = decode_sattr3(p, &args->attrs)))
278 return 0;
279
280 if ((args->check_guard = ntohl(*p++)) != 0) {
281 struct timespec time;
282 p = decode_time3(p, &time);
283 args->guardtime = time.tv_sec;
284 }
285
286 return xdr_argsize_check(rqstp, p);
287 }
288
289 int
290 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, u32 *p,
291 struct nfsd3_diropargs *args)
292 {
293 if (!(p = decode_fh(p, &args->fh))
294 || !(p = decode_filename(p, &args->name, &args->len)))
295 return 0;
296
297 return xdr_argsize_check(rqstp, p);
298 }
299
300 int
301 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, u32 *p,
302 struct nfsd3_accessargs *args)
303 {
304 if (!(p = decode_fh(p, &args->fh)))
305 return 0;
306 args->access = ntohl(*p++);
307
308 return xdr_argsize_check(rqstp, p);
309 }
310
311 int
312 nfs3svc_decode_readargs(struct svc_rqst *rqstp, u32 *p,
313 struct nfsd3_readargs *args)
314 {
315 unsigned int len;
316 int v,pn;
317
318 if (!(p = decode_fh(p, &args->fh))
319 || !(p = xdr_decode_hyper(p, &args->offset)))
320 return 0;
321
322 len = args->count = ntohl(*p++);
323
324 if (len > NFSSVC_MAXBLKSIZE)
325 len = NFSSVC_MAXBLKSIZE;
326
327 /* set up the kvec */
328 v=0;
329 while (len > 0) {
330 pn = rqstp->rq_resused;
331 svc_take_page(rqstp);
332 args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
333 args->vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
334 len -= args->vec[v].iov_len;
335 v++;
336 }
337 args->vlen = v;
338 return xdr_argsize_check(rqstp, p);
339 }
340
341 int
342 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, u32 *p,
343 struct nfsd3_writeargs *args)
344 {
345 unsigned int len, v, hdr;
346
347 if (!(p = decode_fh(p, &args->fh))
348 || !(p = xdr_decode_hyper(p, &args->offset)))
349 return 0;
350
351 args->count = ntohl(*p++);
352 args->stable = ntohl(*p++);
353 len = args->len = ntohl(*p++);
354
355 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
356 if (rqstp->rq_arg.len < len + hdr)
357 return 0;
358
359 args->vec[0].iov_base = (void*)p;
360 args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
361
362 if (len > NFSSVC_MAXBLKSIZE)
363 len = NFSSVC_MAXBLKSIZE;
364 v= 0;
365 while (len > args->vec[v].iov_len) {
366 len -= args->vec[v].iov_len;
367 v++;
368 args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]);
369 args->vec[v].iov_len = PAGE_SIZE;
370 }
371 args->vec[v].iov_len = len;
372 args->vlen = v+1;
373
374 return args->count == args->len && args->vec[0].iov_len > 0;
375 }
376
377 int
378 nfs3svc_decode_createargs(struct svc_rqst *rqstp, u32 *p,
379 struct nfsd3_createargs *args)
380 {
381 if (!(p = decode_fh(p, &args->fh))
382 || !(p = decode_filename(p, &args->name, &args->len)))
383 return 0;
384
385 switch (args->createmode = ntohl(*p++)) {
386 case NFS3_CREATE_UNCHECKED:
387 case NFS3_CREATE_GUARDED:
388 if (!(p = decode_sattr3(p, &args->attrs)))
389 return 0;
390 break;
391 case NFS3_CREATE_EXCLUSIVE:
392 args->verf = p;
393 p += 2;
394 break;
395 default:
396 return 0;
397 }
398
399 return xdr_argsize_check(rqstp, p);
400 }
401 int
402 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, u32 *p,
403 struct nfsd3_createargs *args)
404 {
405 if (!(p = decode_fh(p, &args->fh))
406 || !(p = decode_filename(p, &args->name, &args->len))
407 || !(p = decode_sattr3(p, &args->attrs)))
408 return 0;
409
410 return xdr_argsize_check(rqstp, p);
411 }
412
413 int
414 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p,
415 struct nfsd3_symlinkargs *args)
416 {
417 unsigned int len;
418 int avail;
419 char *old, *new;
420 struct kvec *vec;
421
422 if (!(p = decode_fh(p, &args->ffh))
423 || !(p = decode_filename(p, &args->fname, &args->flen))
424 || !(p = decode_sattr3(p, &args->attrs))
425 )
426 return 0;
427 /* now decode the pathname, which might be larger than the first page.
428 * As we have to check for nul's anyway, we copy it into a new page
429 * This page appears in the rq_res.pages list, but as pages_len is always
430 * 0, it won't get in the way
431 */
432 svc_take_page(rqstp);
433 len = ntohl(*p++);
434 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
435 return 0;
436 args->tname = new = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
437 args->tlen = len;
438 /* first copy and check from the first page */
439 old = (char*)p;
440 vec = &rqstp->rq_arg.head[0];
441 avail = vec->iov_len - (old - (char*)vec->iov_base);
442 while (len && avail && *old) {
443 *new++ = *old++;
444 len--;
445 avail--;
446 }
447 /* now copy next page if there is one */
448 if (len && !avail && rqstp->rq_arg.page_len) {
449 avail = rqstp->rq_arg.page_len;
450 if (avail > PAGE_SIZE) avail = PAGE_SIZE;
451 old = page_address(rqstp->rq_arg.pages[0]);
452 }
453 while (len && avail && *old) {
454 *new++ = *old++;
455 len--;
456 avail--;
457 }
458 *new = '\0';
459 if (len)
460 return 0;
461
462 return 1;
463 }
464
465 int
466 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, u32 *p,
467 struct nfsd3_mknodargs *args)
468 {
469 if (!(p = decode_fh(p, &args->fh))
470 || !(p = decode_filename(p, &args->name, &args->len)))
471 return 0;
472
473 args->ftype = ntohl(*p++);
474
475 if (args->ftype == NF3BLK || args->ftype == NF3CHR
476 || args->ftype == NF3SOCK || args->ftype == NF3FIFO) {
477 if (!(p = decode_sattr3(p, &args->attrs)))
478 return 0;
479 }
480
481 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
482 args->major = ntohl(*p++);
483 args->minor = ntohl(*p++);
484 }
485
486 return xdr_argsize_check(rqstp, p);
487 }
488
489 int
490 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, u32 *p,
491 struct nfsd3_renameargs *args)
492 {
493 if (!(p = decode_fh(p, &args->ffh))
494 || !(p = decode_filename(p, &args->fname, &args->flen))
495 || !(p = decode_fh(p, &args->tfh))
496 || !(p = decode_filename(p, &args->tname, &args->tlen)))
497 return 0;
498
499 return xdr_argsize_check(rqstp, p);
500 }
501
502 int
503 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p,
504 struct nfsd3_readlinkargs *args)
505 {
506 if (!(p = decode_fh(p, &args->fh)))
507 return 0;
508 svc_take_page(rqstp);
509 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
510
511 return xdr_argsize_check(rqstp, p);
512 }
513
514 int
515 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, u32 *p,
516 struct nfsd3_linkargs *args)
517 {
518 if (!(p = decode_fh(p, &args->ffh))
519 || !(p = decode_fh(p, &args->tfh))
520 || !(p = decode_filename(p, &args->tname, &args->tlen)))
521 return 0;
522
523 return xdr_argsize_check(rqstp, p);
524 }
525
526 int
527 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p,
528 struct nfsd3_readdirargs *args)
529 {
530 if (!(p = decode_fh(p, &args->fh)))
531 return 0;
532 p = xdr_decode_hyper(p, &args->cookie);
533 args->verf = p; p += 2;
534 args->dircount = ~0;
535 args->count = ntohl(*p++);
536
537 if (args->count > PAGE_SIZE)
538 args->count = PAGE_SIZE;
539
540 svc_take_page(rqstp);
541 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
542
543 return xdr_argsize_check(rqstp, p);
544 }
545
546 int
547 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p,
548 struct nfsd3_readdirargs *args)
549 {
550 int len, pn;
551
552 if (!(p = decode_fh(p, &args->fh)))
553 return 0;
554 p = xdr_decode_hyper(p, &args->cookie);
555 args->verf = p; p += 2;
556 args->dircount = ntohl(*p++);
557 args->count = ntohl(*p++);
558
559 len = (args->count > NFSSVC_MAXBLKSIZE) ? NFSSVC_MAXBLKSIZE :
560 args->count;
561 args->count = len;
562
563 while (len > 0) {
564 pn = rqstp->rq_resused;
565 svc_take_page(rqstp);
566 if (!args->buffer)
567 args->buffer = page_address(rqstp->rq_respages[pn]);
568 len -= PAGE_SIZE;
569 }
570
571 return xdr_argsize_check(rqstp, p);
572 }
573
574 int
575 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, u32 *p,
576 struct nfsd3_commitargs *args)
577 {
578 if (!(p = decode_fh(p, &args->fh)))
579 return 0;
580 p = xdr_decode_hyper(p, &args->offset);
581 args->count = ntohl(*p++);
582
583 return xdr_argsize_check(rqstp, p);
584 }
585
586 /*
587 * XDR encode functions
588 */
589 /*
590 * There must be an encoding function for void results so svc_process
591 * will work properly.
592 */
593 int
594 nfs3svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
595 {
596 return xdr_ressize_check(rqstp, p);
597 }
598
599 /* GETATTR */
600 int
601 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
602 struct nfsd3_attrstat *resp)
603 {
604 if (resp->status == 0)
605 p = encode_fattr3(rqstp, p, &resp->fh);
606 return xdr_ressize_check(rqstp, p);
607 }
608
609 /* SETATTR, REMOVE, RMDIR */
610 int
611 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, u32 *p,
612 struct nfsd3_attrstat *resp)
613 {
614 p = encode_wcc_data(rqstp, p, &resp->fh);
615 return xdr_ressize_check(rqstp, p);
616 }
617
618 /* LOOKUP */
619 int
620 nfs3svc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
621 struct nfsd3_diropres *resp)
622 {
623 if (resp->status == 0) {
624 p = encode_fh(p, &resp->fh);
625 p = encode_post_op_attr(rqstp, p, &resp->fh);
626 }
627 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
628 return xdr_ressize_check(rqstp, p);
629 }
630
631 /* ACCESS */
632 int
633 nfs3svc_encode_accessres(struct svc_rqst *rqstp, u32 *p,
634 struct nfsd3_accessres *resp)
635 {
636 p = encode_post_op_attr(rqstp, p, &resp->fh);
637 if (resp->status == 0)
638 *p++ = htonl(resp->access);
639 return xdr_ressize_check(rqstp, p);
640 }
641
642 /* READLINK */
643 int
644 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p,
645 struct nfsd3_readlinkres *resp)
646 {
647 p = encode_post_op_attr(rqstp, p, &resp->fh);
648 if (resp->status == 0) {
649 *p++ = htonl(resp->len);
650 xdr_ressize_check(rqstp, p);
651 rqstp->rq_res.page_len = resp->len;
652 if (resp->len & 3) {
653 /* need to pad the tail */
654 rqstp->rq_restailpage = 0;
655 rqstp->rq_res.tail[0].iov_base = p;
656 *p = 0;
657 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
658 }
659 return 1;
660 } else
661 return xdr_ressize_check(rqstp, p);
662 }
663
664 /* READ */
665 int
666 nfs3svc_encode_readres(struct svc_rqst *rqstp, u32 *p,
667 struct nfsd3_readres *resp)
668 {
669 p = encode_post_op_attr(rqstp, p, &resp->fh);
670 if (resp->status == 0) {
671 *p++ = htonl(resp->count);
672 *p++ = htonl(resp->eof);
673 *p++ = htonl(resp->count); /* xdr opaque count */
674 xdr_ressize_check(rqstp, p);
675 /* now update rqstp->rq_res to reflect data aswell */
676 rqstp->rq_res.page_len = resp->count;
677 if (resp->count & 3) {
678 /* need to pad the tail */
679 rqstp->rq_restailpage = 0;
680 rqstp->rq_res.tail[0].iov_base = p;
681 *p = 0;
682 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
683 }
684 return 1;
685 } else
686 return xdr_ressize_check(rqstp, p);
687 }
688
689 /* WRITE */
690 int
691 nfs3svc_encode_writeres(struct svc_rqst *rqstp, u32 *p,
692 struct nfsd3_writeres *resp)
693 {
694 p = encode_wcc_data(rqstp, p, &resp->fh);
695 if (resp->status == 0) {
696 *p++ = htonl(resp->count);
697 *p++ = htonl(resp->committed);
698 *p++ = htonl(nfssvc_boot.tv_sec);
699 *p++ = htonl(nfssvc_boot.tv_usec);
700 }
701 return xdr_ressize_check(rqstp, p);
702 }
703
704 /* CREATE, MKDIR, SYMLINK, MKNOD */
705 int
706 nfs3svc_encode_createres(struct svc_rqst *rqstp, u32 *p,
707 struct nfsd3_diropres *resp)
708 {
709 if (resp->status == 0) {
710 *p++ = xdr_one;
711 p = encode_fh(p, &resp->fh);
712 p = encode_post_op_attr(rqstp, p, &resp->fh);
713 }
714 p = encode_wcc_data(rqstp, p, &resp->dirfh);
715 return xdr_ressize_check(rqstp, p);
716 }
717
718 /* RENAME */
719 int
720 nfs3svc_encode_renameres(struct svc_rqst *rqstp, u32 *p,
721 struct nfsd3_renameres *resp)
722 {
723 p = encode_wcc_data(rqstp, p, &resp->ffh);
724 p = encode_wcc_data(rqstp, p, &resp->tfh);
725 return xdr_ressize_check(rqstp, p);
726 }
727
728 /* LINK */
729 int
730 nfs3svc_encode_linkres(struct svc_rqst *rqstp, u32 *p,
731 struct nfsd3_linkres *resp)
732 {
733 p = encode_post_op_attr(rqstp, p, &resp->fh);
734 p = encode_wcc_data(rqstp, p, &resp->tfh);
735 return xdr_ressize_check(rqstp, p);
736 }
737
738 /* READDIR */
739 int
740 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
741 struct nfsd3_readdirres *resp)
742 {
743 p = encode_post_op_attr(rqstp, p, &resp->fh);
744
745 if (resp->status == 0) {
746 /* stupid readdir cookie */
747 memcpy(p, resp->verf, 8); p += 2;
748 xdr_ressize_check(rqstp, p);
749 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
750 return 1; /*No room for trailer */
751 rqstp->rq_res.page_len = (resp->count) << 2;
752
753 /* add the 'tail' to the end of the 'head' page - page 0. */
754 rqstp->rq_restailpage = 0;
755 rqstp->rq_res.tail[0].iov_base = p;
756 *p++ = 0; /* no more entries */
757 *p++ = htonl(resp->common.err == nfserr_eof);
758 rqstp->rq_res.tail[0].iov_len = 2<<2;
759 return 1;
760 } else
761 return xdr_ressize_check(rqstp, p);
762 }
763
764 static inline u32 *
765 encode_entry_baggage(struct nfsd3_readdirres *cd, u32 *p, const char *name,
766 int namlen, ino_t ino)
767 {
768 *p++ = xdr_one; /* mark entry present */
769 p = xdr_encode_hyper(p, ino); /* file id */
770 p = xdr_encode_array(p, name, namlen);/* name length & name */
771
772 cd->offset = p; /* remember pointer */
773 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
774
775 return p;
776 }
777
778 static inline u32 *
779 encode_entryplus_baggage(struct nfsd3_readdirres *cd, u32 *p,
780 struct svc_fh *fhp)
781 {
782 p = encode_post_op_attr(cd->rqstp, p, fhp);
783 *p++ = xdr_one; /* yes, a file handle follows */
784 p = encode_fh(p, fhp);
785 fh_put(fhp);
786 return p;
787 }
788
789 static int
790 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
791 const char *name, int namlen)
792 {
793 struct svc_export *exp;
794 struct dentry *dparent, *dchild;
795 int rv = 0;
796
797 dparent = cd->fh.fh_dentry;
798 exp = cd->fh.fh_export;
799
800 fh_init(fhp, NFS3_FHSIZE);
801 if (isdotent(name, namlen)) {
802 if (namlen == 2) {
803 dchild = dget_parent(dparent);
804 if (dchild == dparent) {
805 /* filesystem root - cannot return filehandle for ".." */
806 dput(dchild);
807 return 1;
808 }
809 } else
810 dchild = dget(dparent);
811 } else
812 dchild = lookup_one_len(name, dparent, namlen);
813 if (IS_ERR(dchild))
814 return 1;
815 if (d_mountpoint(dchild) ||
816 fh_compose(fhp, exp, dchild, &cd->fh) != 0 ||
817 !dchild->d_inode)
818 rv = 1;
819 dput(dchild);
820 return rv;
821 }
822
823 /*
824 * Encode a directory entry. This one works for both normal readdir
825 * and readdirplus.
826 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
827 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
828 *
829 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
830 * file handle.
831 */
832
833 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
834 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
835 static int
836 encode_entry(struct readdir_cd *ccd, const char *name,
837 int namlen, off_t offset, ino_t ino, unsigned int d_type, int plus)
838 {
839 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
840 common);
841 u32 *p = cd->buffer;
842 caddr_t curr_page_addr = NULL;
843 int pn; /* current page number */
844 int slen; /* string (name) length */
845 int elen; /* estimated entry length in words */
846 int num_entry_words = 0; /* actual number of words */
847
848 if (cd->offset) {
849 u64 offset64 = offset;
850
851 if (unlikely(cd->offset1)) {
852 /* we ended up with offset on a page boundary */
853 *cd->offset = htonl(offset64 >> 32);
854 *cd->offset1 = htonl(offset64 & 0xffffffff);
855 cd->offset1 = NULL;
856 } else {
857 xdr_encode_hyper(cd->offset, (u64) offset);
858 }
859 }
860
861 /*
862 dprintk("encode_entry(%.*s @%ld%s)\n",
863 namlen, name, (long) offset, plus? " plus" : "");
864 */
865
866 /* truncate filename if too long */
867 if (namlen > NFS3_MAXNAMLEN)
868 namlen = NFS3_MAXNAMLEN;
869
870 slen = XDR_QUADLEN(namlen);
871 elen = slen + NFS3_ENTRY_BAGGAGE
872 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
873
874 if (cd->buflen < elen) {
875 cd->common.err = nfserr_toosmall;
876 return -EINVAL;
877 }
878
879 /* determine which page in rq_respages[] we are currently filling */
880 for (pn=1; pn < cd->rqstp->rq_resused; pn++) {
881 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
882
883 if (((caddr_t)cd->buffer >= curr_page_addr) &&
884 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
885 break;
886 }
887
888 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
889 /* encode entry in current page */
890
891 p = encode_entry_baggage(cd, p, name, namlen, ino);
892
893 /* throw in readdirplus baggage */
894 if (plus) {
895 struct svc_fh fh;
896
897 if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
898 *p++ = 0;
899 *p++ = 0;
900 } else
901 p = encode_entryplus_baggage(cd, p, &fh);
902 }
903 num_entry_words = p - cd->buffer;
904 } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
905 /* temporarily encode entry into next page, then move back to
906 * current and next page in rq_respages[] */
907 u32 *p1, *tmp;
908 int len1, len2;
909
910 /* grab next page for temporary storage of entry */
911 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
912
913 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
914
915 /* throw in readdirplus baggage */
916 if (plus) {
917 struct svc_fh fh;
918
919 if (compose_entry_fh(cd, &fh, name, namlen) > 0) {
920 /* zero out the filehandle */
921 *p1++ = 0;
922 *p1++ = 0;
923 } else
924 p1 = encode_entryplus_baggage(cd, p1, &fh);
925 }
926
927 /* determine entry word length and lengths to go in pages */
928 num_entry_words = p1 - tmp;
929 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
930 if ((num_entry_words << 2) < len1) {
931 /* the actual number of words in the entry is less
932 * than elen and can still fit in the current page
933 */
934 memmove(p, tmp, num_entry_words << 2);
935 p += num_entry_words;
936
937 /* update offset */
938 cd->offset = cd->buffer + (cd->offset - tmp);
939 } else {
940 unsigned int offset_r = (cd->offset - tmp) << 2;
941
942 /* update pointer to offset location.
943 * This is a 64bit quantity, so we need to
944 * deal with 3 cases:
945 * - entirely in first page
946 * - entirely in second page
947 * - 4 bytes in each page
948 */
949 if (offset_r + 8 <= len1) {
950 cd->offset = p + (cd->offset - tmp);
951 } else if (offset_r >= len1) {
952 cd->offset -= len1 >> 2;
953 } else {
954 /* sitting on the fence */
955 BUG_ON(offset_r != len1 - 4);
956 cd->offset = p + (cd->offset - tmp);
957 cd->offset1 = tmp;
958 }
959
960 len2 = (num_entry_words << 2) - len1;
961
962 /* move from temp page to current and next pages */
963 memmove(p, tmp, len1);
964 memmove(tmp, (caddr_t)tmp+len1, len2);
965
966 p = tmp + (len2 >> 2);
967 }
968 }
969 else {
970 cd->common.err = nfserr_toosmall;
971 return -EINVAL;
972 }
973
974 cd->buflen -= num_entry_words;
975 cd->buffer = p;
976 cd->common.err = nfs_ok;
977 return 0;
978
979 }
980
981 int
982 nfs3svc_encode_entry(struct readdir_cd *cd, const char *name,
983 int namlen, loff_t offset, ino_t ino, unsigned int d_type)
984 {
985 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
986 }
987
988 int
989 nfs3svc_encode_entry_plus(struct readdir_cd *cd, const char *name,
990 int namlen, loff_t offset, ino_t ino, unsigned int d_type)
991 {
992 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
993 }
994
995 /* FSSTAT */
996 int
997 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, u32 *p,
998 struct nfsd3_fsstatres *resp)
999 {
1000 struct kstatfs *s = &resp->stats;
1001 u64 bs = s->f_bsize;
1002
1003 *p++ = xdr_zero; /* no post_op_attr */
1004
1005 if (resp->status == 0) {
1006 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1007 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1008 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1009 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1010 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1011 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1012 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1013 }
1014 return xdr_ressize_check(rqstp, p);
1015 }
1016
1017 /* FSINFO */
1018 int
1019 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, u32 *p,
1020 struct nfsd3_fsinfores *resp)
1021 {
1022 *p++ = xdr_zero; /* no post_op_attr */
1023
1024 if (resp->status == 0) {
1025 *p++ = htonl(resp->f_rtmax);
1026 *p++ = htonl(resp->f_rtpref);
1027 *p++ = htonl(resp->f_rtmult);
1028 *p++ = htonl(resp->f_wtmax);
1029 *p++ = htonl(resp->f_wtpref);
1030 *p++ = htonl(resp->f_wtmult);
1031 *p++ = htonl(resp->f_dtpref);
1032 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1033 *p++ = xdr_one;
1034 *p++ = xdr_zero;
1035 *p++ = htonl(resp->f_properties);
1036 }
1037
1038 return xdr_ressize_check(rqstp, p);
1039 }
1040
1041 /* PATHCONF */
1042 int
1043 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, u32 *p,
1044 struct nfsd3_pathconfres *resp)
1045 {
1046 *p++ = xdr_zero; /* no post_op_attr */
1047
1048 if (resp->status == 0) {
1049 *p++ = htonl(resp->p_link_max);
1050 *p++ = htonl(resp->p_name_max);
1051 *p++ = htonl(resp->p_no_trunc);
1052 *p++ = htonl(resp->p_chown_restricted);
1053 *p++ = htonl(resp->p_case_insensitive);
1054 *p++ = htonl(resp->p_case_preserving);
1055 }
1056
1057 return xdr_ressize_check(rqstp, p);
1058 }
1059
1060 /* COMMIT */
1061 int
1062 nfs3svc_encode_commitres(struct svc_rqst *rqstp, u32 *p,
1063 struct nfsd3_commitres *resp)
1064 {
1065 p = encode_wcc_data(rqstp, p, &resp->fh);
1066 /* Write verifier */
1067 if (resp->status == 0) {
1068 *p++ = htonl(nfssvc_boot.tv_sec);
1069 *p++ = htonl(nfssvc_boot.tv_usec);
1070 }
1071 return xdr_ressize_check(rqstp, p);
1072 }
1073
1074 /*
1075 * XDR release functions
1076 */
1077 int
1078 nfs3svc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
1079 struct nfsd3_attrstat *resp)
1080 {
1081 fh_put(&resp->fh);
1082 return 1;
1083 }
1084
1085 int
1086 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, u32 *p,
1087 struct nfsd3_fhandle_pair *resp)
1088 {
1089 fh_put(&resp->fh1);
1090 fh_put(&resp->fh2);
1091 return 1;
1092 }
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