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staging: xillybus: fix format string usage
[linux-2.6/btrfs-unstable.git] / fs / nfsd / nfs3xdr.c
blob14d9ecb96cff0ba476549467fbc321f94ea55ff3
1 /*
2 * XDR support for nfsd/protocol version 3.
3 *
4 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
5 *
6 * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
7 */
8
9 #include <linux/namei.h>
10 #include <linux/sunrpc/svc_xprt.h>
11 #include "xdr3.h"
12 #include "auth.h"
13 #include "netns.h"
14 #include "vfs.h"
15
16 #define NFSDDBG_FACILITY NFSDDBG_XDR
17
18
19 /*
20 * Mapping of S_IF* types to NFS file types
21 */
22 static u32 nfs3_ftypes[] = {
23 NF3NON, NF3FIFO, NF3CHR, NF3BAD,
24 NF3DIR, NF3BAD, NF3BLK, NF3BAD,
25 NF3REG, NF3BAD, NF3LNK, NF3BAD,
26 NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
27 };
28
29 /*
30 * XDR functions for basic NFS types
31 */
32 static __be32 *
33 encode_time3(__be32 *p, struct timespec *time)
34 {
35 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
36 return p;
37 }
38
39 static __be32 *
40 decode_time3(__be32 *p, struct timespec *time)
41 {
42 time->tv_sec = ntohl(*p++);
43 time->tv_nsec = ntohl(*p++);
44 return p;
45 }
46
47 static __be32 *
48 decode_fh(__be32 *p, struct svc_fh *fhp)
49 {
50 unsigned int size;
51 fh_init(fhp, NFS3_FHSIZE);
52 size = ntohl(*p++);
53 if (size > NFS3_FHSIZE)
54 return NULL;
55
56 memcpy(&fhp->fh_handle.fh_base, p, size);
57 fhp->fh_handle.fh_size = size;
58 return p + XDR_QUADLEN(size);
59 }
60
61 /* Helper function for NFSv3 ACL code */
62 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
63 {
64 return decode_fh(p, fhp);
65 }
66
67 static __be32 *
68 encode_fh(__be32 *p, struct svc_fh *fhp)
69 {
70 unsigned int size = fhp->fh_handle.fh_size;
71 *p++ = htonl(size);
72 if (size) p[XDR_QUADLEN(size)-1]=0;
73 memcpy(p, &fhp->fh_handle.fh_base, size);
74 return p + XDR_QUADLEN(size);
75 }
76
77 /*
78 * Decode a file name and make sure that the path contains
79 * no slashes or null bytes.
80 */
81 static __be32 *
82 decode_filename(__be32 *p, char **namp, unsigned int *lenp)
83 {
84 char *name;
85 unsigned int i;
86
87 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
88 for (i = 0, name = *namp; i < *lenp; i++, name++) {
89 if (*name == '\0' || *name == '/')
90 return NULL;
91 }
92 }
93
94 return p;
95 }
96
97 static __be32 *
98 decode_sattr3(__be32 *p, struct iattr *iap)
99 {
100 u32 tmp;
101
102 iap->ia_valid = 0;
103
104 if (*p++) {
105 iap->ia_valid |= ATTR_MODE;
106 iap->ia_mode = ntohl(*p++);
107 }
108 if (*p++) {
109 iap->ia_uid = make_kuid(&init_user_ns, ntohl(*p++));
110 if (uid_valid(iap->ia_uid))
111 iap->ia_valid |= ATTR_UID;
112 }
113 if (*p++) {
114 iap->ia_gid = make_kgid(&init_user_ns, ntohl(*p++));
115 if (gid_valid(iap->ia_gid))
116 iap->ia_valid |= ATTR_GID;
117 }
118 if (*p++) {
119 u64 newsize;
120
121 iap->ia_valid |= ATTR_SIZE;
122 p = xdr_decode_hyper(p, &newsize);
123 if (newsize <= NFS_OFFSET_MAX)
124 iap->ia_size = newsize;
125 else
126 iap->ia_size = NFS_OFFSET_MAX;
127 }
128 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
129 iap->ia_valid |= ATTR_ATIME;
130 } else if (tmp == 2) { /* set to client time */
131 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
132 iap->ia_atime.tv_sec = ntohl(*p++);
133 iap->ia_atime.tv_nsec = ntohl(*p++);
134 }
135 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
136 iap->ia_valid |= ATTR_MTIME;
137 } else if (tmp == 2) { /* set to client time */
138 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
139 iap->ia_mtime.tv_sec = ntohl(*p++);
140 iap->ia_mtime.tv_nsec = ntohl(*p++);
141 }
142 return p;
143 }
144
145 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
146 {
147 u64 f;
148 switch(fsid_source(fhp)) {
149 default:
150 case FSIDSOURCE_DEV:
151 p = xdr_encode_hyper(p, (u64)huge_encode_dev
152 (fhp->fh_dentry->d_inode->i_sb->s_dev));
153 break;
154 case FSIDSOURCE_FSID:
155 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
156 break;
157 case FSIDSOURCE_UUID:
158 f = ((u64*)fhp->fh_export->ex_uuid)[0];
159 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
160 p = xdr_encode_hyper(p, f);
161 break;
162 }
163 return p;
164 }
165
166 static __be32 *
167 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
168 struct kstat *stat)
169 {
170 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
171 *p++ = htonl((u32) stat->mode);
172 *p++ = htonl((u32) stat->nlink);
173 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
174 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
175 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
176 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
177 } else {
178 p = xdr_encode_hyper(p, (u64) stat->size);
179 }
180 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
181 *p++ = htonl((u32) MAJOR(stat->rdev));
182 *p++ = htonl((u32) MINOR(stat->rdev));
183 p = encode_fsid(p, fhp);
184 p = xdr_encode_hyper(p, stat->ino);
185 p = encode_time3(p, &stat->atime);
186 p = encode_time3(p, &stat->mtime);
187 p = encode_time3(p, &stat->ctime);
188
189 return p;
190 }
191
192 static __be32 *
193 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
194 {
195 /* Attributes to follow */
196 *p++ = xdr_one;
197 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
198 }
199
200 /*
201 * Encode post-operation attributes.
202 * The inode may be NULL if the call failed because of a stale file
203 * handle. In this case, no attributes are returned.
204 */
205 static __be32 *
206 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
207 {
208 struct dentry *dentry = fhp->fh_dentry;
209 if (dentry && dentry->d_inode) {
210 __be32 err;
211 struct kstat stat;
212
213 err = fh_getattr(fhp, &stat);
214 if (!err) {
215 *p++ = xdr_one; /* attributes follow */
216 lease_get_mtime(dentry->d_inode, &stat.mtime);
217 return encode_fattr3(rqstp, p, fhp, &stat);
218 }
219 }
220 *p++ = xdr_zero;
221 return p;
222 }
223
224 /* Helper for NFSv3 ACLs */
225 __be32 *
226 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
227 {
228 return encode_post_op_attr(rqstp, p, fhp);
229 }
230
231 /*
232 * Enocde weak cache consistency data
233 */
234 static __be32 *
235 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
236 {
237 struct dentry *dentry = fhp->fh_dentry;
238
239 if (dentry && dentry->d_inode && fhp->fh_post_saved) {
240 if (fhp->fh_pre_saved) {
241 *p++ = xdr_one;
242 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
243 p = encode_time3(p, &fhp->fh_pre_mtime);
244 p = encode_time3(p, &fhp->fh_pre_ctime);
245 } else {
246 *p++ = xdr_zero;
247 }
248 return encode_saved_post_attr(rqstp, p, fhp);
249 }
250 /* no pre- or post-attrs */
251 *p++ = xdr_zero;
252 return encode_post_op_attr(rqstp, p, fhp);
253 }
254
255 /*
256 * Fill in the post_op attr for the wcc data
257 */
258 void fill_post_wcc(struct svc_fh *fhp)
259 {
260 __be32 err;
261
262 if (fhp->fh_post_saved)
263 printk("nfsd: inode locked twice during operation.\n");
264
265 err = fh_getattr(fhp, &fhp->fh_post_attr);
266 fhp->fh_post_change = fhp->fh_dentry->d_inode->i_version;
267 if (err) {
268 fhp->fh_post_saved = 0;
269 /* Grab the ctime anyway - set_change_info might use it */
270 fhp->fh_post_attr.ctime = fhp->fh_dentry->d_inode->i_ctime;
271 } else
272 fhp->fh_post_saved = 1;
273 }
274
275 /*
276 * XDR decode functions
277 */
278 int
279 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
280 {
281 if (!(p = decode_fh(p, &args->fh)))
282 return 0;
283 return xdr_argsize_check(rqstp, p);
284 }
285
286 int
287 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
288 struct nfsd3_sattrargs *args)
289 {
290 if (!(p = decode_fh(p, &args->fh)))
291 return 0;
292 p = decode_sattr3(p, &args->attrs);
293
294 if ((args->check_guard = ntohl(*p++)) != 0) {
295 struct timespec time;
296 p = decode_time3(p, &time);
297 args->guardtime = time.tv_sec;
298 }
299
300 return xdr_argsize_check(rqstp, p);
301 }
302
303 int
304 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
305 struct nfsd3_diropargs *args)
306 {
307 if (!(p = decode_fh(p, &args->fh))
308 || !(p = decode_filename(p, &args->name, &args->len)))
309 return 0;
310
311 return xdr_argsize_check(rqstp, p);
312 }
313
314 int
315 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
316 struct nfsd3_accessargs *args)
317 {
318 if (!(p = decode_fh(p, &args->fh)))
319 return 0;
320 args->access = ntohl(*p++);
321
322 return xdr_argsize_check(rqstp, p);
323 }
324
325 int
326 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
327 struct nfsd3_readargs *args)
328 {
329 unsigned int len;
330 int v;
331 u32 max_blocksize = svc_max_payload(rqstp);
332
333 if (!(p = decode_fh(p, &args->fh)))
334 return 0;
335 p = xdr_decode_hyper(p, &args->offset);
336
337 len = args->count = ntohl(*p++);
338
339 if (len > max_blocksize)
340 len = max_blocksize;
341
342 /* set up the kvec */
343 v=0;
344 while (len > 0) {
345 struct page *p = *(rqstp->rq_next_page++);
346
347 rqstp->rq_vec[v].iov_base = page_address(p);
348 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
349 len -= rqstp->rq_vec[v].iov_len;
350 v++;
351 }
352 args->vlen = v;
353 return xdr_argsize_check(rqstp, p);
354 }
355
356 int
357 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
358 struct nfsd3_writeargs *args)
359 {
360 unsigned int len, v, hdr, dlen;
361 u32 max_blocksize = svc_max_payload(rqstp);
362
363 if (!(p = decode_fh(p, &args->fh)))
364 return 0;
365 p = xdr_decode_hyper(p, &args->offset);
366
367 args->count = ntohl(*p++);
368 args->stable = ntohl(*p++);
369 len = args->len = ntohl(*p++);
370 /*
371 * The count must equal the amount of data passed.
372 */
373 if (args->count != args->len)
374 return 0;
375
376 /*
377 * Check to make sure that we got the right number of
378 * bytes.
379 */
380 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
381 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
382 - hdr;
383 /*
384 * Round the length of the data which was specified up to
385 * the next multiple of XDR units and then compare that
386 * against the length which was actually received.
387 * Note that when RPCSEC/GSS (for example) is used, the
388 * data buffer can be padded so dlen might be larger
389 * than required. It must never be smaller.
390 */
391 if (dlen < XDR_QUADLEN(len)*4)
392 return 0;
393
394 if (args->count > max_blocksize) {
395 args->count = max_blocksize;
396 len = args->len = max_blocksize;
397 }
398 rqstp->rq_vec[0].iov_base = (void*)p;
399 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
400 v = 0;
401 while (len > rqstp->rq_vec[v].iov_len) {
402 len -= rqstp->rq_vec[v].iov_len;
403 v++;
404 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
405 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
406 }
407 rqstp->rq_vec[v].iov_len = len;
408 args->vlen = v + 1;
409 return 1;
410 }
411
412 int
413 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
414 struct nfsd3_createargs *args)
415 {
416 if (!(p = decode_fh(p, &args->fh))
417 || !(p = decode_filename(p, &args->name, &args->len)))
418 return 0;
419
420 switch (args->createmode = ntohl(*p++)) {
421 case NFS3_CREATE_UNCHECKED:
422 case NFS3_CREATE_GUARDED:
423 p = decode_sattr3(p, &args->attrs);
424 break;
425 case NFS3_CREATE_EXCLUSIVE:
426 args->verf = p;
427 p += 2;
428 break;
429 default:
430 return 0;
431 }
432
433 return xdr_argsize_check(rqstp, p);
434 }
435 int
436 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
437 struct nfsd3_createargs *args)
438 {
439 if (!(p = decode_fh(p, &args->fh)) ||
440 !(p = decode_filename(p, &args->name, &args->len)))
441 return 0;
442 p = decode_sattr3(p, &args->attrs);
443
444 return xdr_argsize_check(rqstp, p);
445 }
446
447 int
448 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
449 struct nfsd3_symlinkargs *args)
450 {
451 unsigned int len, avail;
452 char *old, *new;
453 struct kvec *vec;
454
455 if (!(p = decode_fh(p, &args->ffh)) ||
456 !(p = decode_filename(p, &args->fname, &args->flen))
457 )
458 return 0;
459 p = decode_sattr3(p, &args->attrs);
460
461 /* now decode the pathname, which might be larger than the first page.
462 * As we have to check for nul's anyway, we copy it into a new page
463 * This page appears in the rq_res.pages list, but as pages_len is always
464 * 0, it won't get in the way
465 */
466 len = ntohl(*p++);
467 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
468 return 0;
469 args->tname = new = page_address(*(rqstp->rq_next_page++));
470 args->tlen = len;
471 /* first copy and check from the first page */
472 old = (char*)p;
473 vec = &rqstp->rq_arg.head[0];
474 avail = vec->iov_len - (old - (char*)vec->iov_base);
475 while (len && avail && *old) {
476 *new++ = *old++;
477 len--;
478 avail--;
479 }
480 /* now copy next page if there is one */
481 if (len && !avail && rqstp->rq_arg.page_len) {
482 avail = rqstp->rq_arg.page_len;
483 if (avail > PAGE_SIZE)
484 avail = PAGE_SIZE;
485 old = page_address(rqstp->rq_arg.pages[0]);
486 }
487 while (len && avail && *old) {
488 *new++ = *old++;
489 len--;
490 avail--;
491 }
492 *new = '\0';
493 if (len)
494 return 0;
495
496 return 1;
497 }
498
499 int
500 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
501 struct nfsd3_mknodargs *args)
502 {
503 if (!(p = decode_fh(p, &args->fh))
504 || !(p = decode_filename(p, &args->name, &args->len)))
505 return 0;
506
507 args->ftype = ntohl(*p++);
508
509 if (args->ftype == NF3BLK || args->ftype == NF3CHR
510 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
511 p = decode_sattr3(p, &args->attrs);
512
513 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
514 args->major = ntohl(*p++);
515 args->minor = ntohl(*p++);
516 }
517
518 return xdr_argsize_check(rqstp, p);
519 }
520
521 int
522 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
523 struct nfsd3_renameargs *args)
524 {
525 if (!(p = decode_fh(p, &args->ffh))
526 || !(p = decode_filename(p, &args->fname, &args->flen))
527 || !(p = decode_fh(p, &args->tfh))
528 || !(p = decode_filename(p, &args->tname, &args->tlen)))
529 return 0;
530
531 return xdr_argsize_check(rqstp, p);
532 }
533
534 int
535 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
536 struct nfsd3_readlinkargs *args)
537 {
538 if (!(p = decode_fh(p, &args->fh)))
539 return 0;
540 args->buffer = page_address(*(rqstp->rq_next_page++));
541
542 return xdr_argsize_check(rqstp, p);
543 }
544
545 int
546 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
547 struct nfsd3_linkargs *args)
548 {
549 if (!(p = decode_fh(p, &args->ffh))
550 || !(p = decode_fh(p, &args->tfh))
551 || !(p = decode_filename(p, &args->tname, &args->tlen)))
552 return 0;
553
554 return xdr_argsize_check(rqstp, p);
555 }
556
557 int
558 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
559 struct nfsd3_readdirargs *args)
560 {
561 if (!(p = decode_fh(p, &args->fh)))
562 return 0;
563 p = xdr_decode_hyper(p, &args->cookie);
564 args->verf = p; p += 2;
565 args->dircount = ~0;
566 args->count = ntohl(*p++);
567
568 if (args->count > PAGE_SIZE)
569 args->count = PAGE_SIZE;
570
571 args->buffer = page_address(*(rqstp->rq_next_page++));
572
573 return xdr_argsize_check(rqstp, p);
574 }
575
576 int
577 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
578 struct nfsd3_readdirargs *args)
579 {
580 int len;
581 u32 max_blocksize = svc_max_payload(rqstp);
582
583 if (!(p = decode_fh(p, &args->fh)))
584 return 0;
585 p = xdr_decode_hyper(p, &args->cookie);
586 args->verf = p; p += 2;
587 args->dircount = ntohl(*p++);
588 args->count = ntohl(*p++);
589
590 len = (args->count > max_blocksize) ? max_blocksize :
591 args->count;
592 args->count = len;
593
594 while (len > 0) {
595 struct page *p = *(rqstp->rq_next_page++);
596 if (!args->buffer)
597 args->buffer = page_address(p);
598 len -= PAGE_SIZE;
599 }
600
601 return xdr_argsize_check(rqstp, p);
602 }
603
604 int
605 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
606 struct nfsd3_commitargs *args)
607 {
608 if (!(p = decode_fh(p, &args->fh)))
609 return 0;
610 p = xdr_decode_hyper(p, &args->offset);
611 args->count = ntohl(*p++);
612
613 return xdr_argsize_check(rqstp, p);
614 }
615
616 /*
617 * XDR encode functions
618 */
619 /*
620 * There must be an encoding function for void results so svc_process
621 * will work properly.
622 */
623 int
624 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
625 {
626 return xdr_ressize_check(rqstp, p);
627 }
628
629 /* GETATTR */
630 int
631 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
632 struct nfsd3_attrstat *resp)
633 {
634 if (resp->status == 0) {
635 lease_get_mtime(resp->fh.fh_dentry->d_inode,
636 &resp->stat.mtime);
637 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
638 }
639 return xdr_ressize_check(rqstp, p);
640 }
641
642 /* SETATTR, REMOVE, RMDIR */
643 int
644 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
645 struct nfsd3_attrstat *resp)
646 {
647 p = encode_wcc_data(rqstp, p, &resp->fh);
648 return xdr_ressize_check(rqstp, p);
649 }
650
651 /* LOOKUP */
652 int
653 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
654 struct nfsd3_diropres *resp)
655 {
656 if (resp->status == 0) {
657 p = encode_fh(p, &resp->fh);
658 p = encode_post_op_attr(rqstp, p, &resp->fh);
659 }
660 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
661 return xdr_ressize_check(rqstp, p);
662 }
663
664 /* ACCESS */
665 int
666 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
667 struct nfsd3_accessres *resp)
668 {
669 p = encode_post_op_attr(rqstp, p, &resp->fh);
670 if (resp->status == 0)
671 *p++ = htonl(resp->access);
672 return xdr_ressize_check(rqstp, p);
673 }
674
675 /* READLINK */
676 int
677 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
678 struct nfsd3_readlinkres *resp)
679 {
680 p = encode_post_op_attr(rqstp, p, &resp->fh);
681 if (resp->status == 0) {
682 *p++ = htonl(resp->len);
683 xdr_ressize_check(rqstp, p);
684 rqstp->rq_res.page_len = resp->len;
685 if (resp->len & 3) {
686 /* need to pad the tail */
687 rqstp->rq_res.tail[0].iov_base = p;
688 *p = 0;
689 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
690 }
691 return 1;
692 } else
693 return xdr_ressize_check(rqstp, p);
694 }
695
696 /* READ */
697 int
698 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
699 struct nfsd3_readres *resp)
700 {
701 p = encode_post_op_attr(rqstp, p, &resp->fh);
702 if (resp->status == 0) {
703 *p++ = htonl(resp->count);
704 *p++ = htonl(resp->eof);
705 *p++ = htonl(resp->count); /* xdr opaque count */
706 xdr_ressize_check(rqstp, p);
707 /* now update rqstp->rq_res to reflect data as well */
708 rqstp->rq_res.page_len = resp->count;
709 if (resp->count & 3) {
710 /* need to pad the tail */
711 rqstp->rq_res.tail[0].iov_base = p;
712 *p = 0;
713 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
714 }
715 return 1;
716 } else
717 return xdr_ressize_check(rqstp, p);
718 }
719
720 /* WRITE */
721 int
722 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
723 struct nfsd3_writeres *resp)
724 {
725 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
726
727 p = encode_wcc_data(rqstp, p, &resp->fh);
728 if (resp->status == 0) {
729 *p++ = htonl(resp->count);
730 *p++ = htonl(resp->committed);
731 *p++ = htonl(nn->nfssvc_boot.tv_sec);
732 *p++ = htonl(nn->nfssvc_boot.tv_usec);
733 }
734 return xdr_ressize_check(rqstp, p);
735 }
736
737 /* CREATE, MKDIR, SYMLINK, MKNOD */
738 int
739 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
740 struct nfsd3_diropres *resp)
741 {
742 if (resp->status == 0) {
743 *p++ = xdr_one;
744 p = encode_fh(p, &resp->fh);
745 p = encode_post_op_attr(rqstp, p, &resp->fh);
746 }
747 p = encode_wcc_data(rqstp, p, &resp->dirfh);
748 return xdr_ressize_check(rqstp, p);
749 }
750
751 /* RENAME */
752 int
753 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
754 struct nfsd3_renameres *resp)
755 {
756 p = encode_wcc_data(rqstp, p, &resp->ffh);
757 p = encode_wcc_data(rqstp, p, &resp->tfh);
758 return xdr_ressize_check(rqstp, p);
759 }
760
761 /* LINK */
762 int
763 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
764 struct nfsd3_linkres *resp)
765 {
766 p = encode_post_op_attr(rqstp, p, &resp->fh);
767 p = encode_wcc_data(rqstp, p, &resp->tfh);
768 return xdr_ressize_check(rqstp, p);
769 }
770
771 /* READDIR */
772 int
773 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
774 struct nfsd3_readdirres *resp)
775 {
776 p = encode_post_op_attr(rqstp, p, &resp->fh);
777
778 if (resp->status == 0) {
779 /* stupid readdir cookie */
780 memcpy(p, resp->verf, 8); p += 2;
781 xdr_ressize_check(rqstp, p);
782 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
783 return 1; /*No room for trailer */
784 rqstp->rq_res.page_len = (resp->count) << 2;
785
786 /* add the 'tail' to the end of the 'head' page - page 0. */
787 rqstp->rq_res.tail[0].iov_base = p;
788 *p++ = 0; /* no more entries */
789 *p++ = htonl(resp->common.err == nfserr_eof);
790 rqstp->rq_res.tail[0].iov_len = 2<<2;
791 return 1;
792 } else
793 return xdr_ressize_check(rqstp, p);
794 }
795
796 static __be32 *
797 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
798 int namlen, u64 ino)
799 {
800 *p++ = xdr_one; /* mark entry present */
801 p = xdr_encode_hyper(p, ino); /* file id */
802 p = xdr_encode_array(p, name, namlen);/* name length & name */
803
804 cd->offset = p; /* remember pointer */
805 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
806
807 return p;
808 }
809
810 static __be32
811 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
812 const char *name, int namlen)
813 {
814 struct svc_export *exp;
815 struct dentry *dparent, *dchild;
816 __be32 rv = nfserr_noent;
817
818 dparent = cd->fh.fh_dentry;
819 exp = cd->fh.fh_export;
820
821 if (isdotent(name, namlen)) {
822 if (namlen == 2) {
823 dchild = dget_parent(dparent);
824 /* filesystem root - cannot return filehandle for ".." */
825 if (dchild == dparent)
826 goto out;
827 } else
828 dchild = dget(dparent);
829 } else
830 dchild = lookup_one_len(name, dparent, namlen);
831 if (IS_ERR(dchild))
832 return rv;
833 if (d_mountpoint(dchild))
834 goto out;
835 if (!dchild->d_inode)
836 goto out;
837 rv = fh_compose(fhp, exp, dchild, &cd->fh);
838 out:
839 dput(dchild);
840 return rv;
841 }
842
843 static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen)
844 {
845 struct svc_fh fh;
846 __be32 err;
847
848 fh_init(&fh, NFS3_FHSIZE);
849 err = compose_entry_fh(cd, &fh, name, namlen);
850 if (err) {
851 *p++ = 0;
852 *p++ = 0;
853 goto out;
854 }
855 p = encode_post_op_attr(cd->rqstp, p, &fh);
856 *p++ = xdr_one; /* yes, a file handle follows */
857 p = encode_fh(p, &fh);
858 out:
859 fh_put(&fh);
860 return p;
861 }
862
863 /*
864 * Encode a directory entry. This one works for both normal readdir
865 * and readdirplus.
866 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
867 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
868 *
869 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
870 * file handle.
871 */
872
873 #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
874 #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
875 static int
876 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
877 loff_t offset, u64 ino, unsigned int d_type, int plus)
878 {
879 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
880 common);
881 __be32 *p = cd->buffer;
882 caddr_t curr_page_addr = NULL;
883 struct page ** page;
884 int slen; /* string (name) length */
885 int elen; /* estimated entry length in words */
886 int num_entry_words = 0; /* actual number of words */
887
888 if (cd->offset) {
889 u64 offset64 = offset;
890
891 if (unlikely(cd->offset1)) {
892 /* we ended up with offset on a page boundary */
893 *cd->offset = htonl(offset64 >> 32);
894 *cd->offset1 = htonl(offset64 & 0xffffffff);
895 cd->offset1 = NULL;
896 } else {
897 xdr_encode_hyper(cd->offset, offset64);
898 }
899 }
900
901 /*
902 dprintk("encode_entry(%.*s @%ld%s)\n",
903 namlen, name, (long) offset, plus? " plus" : "");
904 */
905
906 /* truncate filename if too long */
907 if (namlen > NFS3_MAXNAMLEN)
908 namlen = NFS3_MAXNAMLEN;
909
910 slen = XDR_QUADLEN(namlen);
911 elen = slen + NFS3_ENTRY_BAGGAGE
912 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
913
914 if (cd->buflen < elen) {
915 cd->common.err = nfserr_toosmall;
916 return -EINVAL;
917 }
918
919 /* determine which page in rq_respages[] we are currently filling */
920 for (page = cd->rqstp->rq_respages + 1;
921 page < cd->rqstp->rq_next_page; page++) {
922 curr_page_addr = page_address(*page);
923
924 if (((caddr_t)cd->buffer >= curr_page_addr) &&
925 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
926 break;
927 }
928
929 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
930 /* encode entry in current page */
931
932 p = encode_entry_baggage(cd, p, name, namlen, ino);
933
934 if (plus)
935 p = encode_entryplus_baggage(cd, p, name, namlen);
936 num_entry_words = p - cd->buffer;
937 } else if (*(page+1) != NULL) {
938 /* temporarily encode entry into next page, then move back to
939 * current and next page in rq_respages[] */
940 __be32 *p1, *tmp;
941 int len1, len2;
942
943 /* grab next page for temporary storage of entry */
944 p1 = tmp = page_address(*(page+1));
945
946 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
947
948 if (plus)
949 p1 = encode_entryplus_baggage(cd, p1, name, namlen);
950
951 /* determine entry word length and lengths to go in pages */
952 num_entry_words = p1 - tmp;
953 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
954 if ((num_entry_words << 2) < len1) {
955 /* the actual number of words in the entry is less
956 * than elen and can still fit in the current page
957 */
958 memmove(p, tmp, num_entry_words << 2);
959 p += num_entry_words;
960
961 /* update offset */
962 cd->offset = cd->buffer + (cd->offset - tmp);
963 } else {
964 unsigned int offset_r = (cd->offset - tmp) << 2;
965
966 /* update pointer to offset location.
967 * This is a 64bit quantity, so we need to
968 * deal with 3 cases:
969 * - entirely in first page
970 * - entirely in second page
971 * - 4 bytes in each page
972 */
973 if (offset_r + 8 <= len1) {
974 cd->offset = p + (cd->offset - tmp);
975 } else if (offset_r >= len1) {
976 cd->offset -= len1 >> 2;
977 } else {
978 /* sitting on the fence */
979 BUG_ON(offset_r != len1 - 4);
980 cd->offset = p + (cd->offset - tmp);
981 cd->offset1 = tmp;
982 }
983
984 len2 = (num_entry_words << 2) - len1;
985
986 /* move from temp page to current and next pages */
987 memmove(p, tmp, len1);
988 memmove(tmp, (caddr_t)tmp+len1, len2);
989
990 p = tmp + (len2 >> 2);
991 }
992 }
993 else {
994 cd->common.err = nfserr_toosmall;
995 return -EINVAL;
996 }
997
998 cd->buflen -= num_entry_words;
999 cd->buffer = p;
1000 cd->common.err = nfs_ok;
1001 return 0;
1002
1003 }
1004
1005 int
1006 nfs3svc_encode_entry(void *cd, const char *name,
1007 int namlen, loff_t offset, u64 ino, unsigned int d_type)
1008 {
1009 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1010 }
1011
1012 int
1013 nfs3svc_encode_entry_plus(void *cd, const char *name,
1014 int namlen, loff_t offset, u64 ino,
1015 unsigned int d_type)
1016 {
1017 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1018 }
1019
1020 /* FSSTAT */
1021 int
1022 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1023 struct nfsd3_fsstatres *resp)
1024 {
1025 struct kstatfs *s = &resp->stats;
1026 u64 bs = s->f_bsize;
1027
1028 *p++ = xdr_zero; /* no post_op_attr */
1029
1030 if (resp->status == 0) {
1031 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1032 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1033 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1034 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1035 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1036 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1037 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1038 }
1039 return xdr_ressize_check(rqstp, p);
1040 }
1041
1042 /* FSINFO */
1043 int
1044 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1045 struct nfsd3_fsinfores *resp)
1046 {
1047 *p++ = xdr_zero; /* no post_op_attr */
1048
1049 if (resp->status == 0) {
1050 *p++ = htonl(resp->f_rtmax);
1051 *p++ = htonl(resp->f_rtpref);
1052 *p++ = htonl(resp->f_rtmult);
1053 *p++ = htonl(resp->f_wtmax);
1054 *p++ = htonl(resp->f_wtpref);
1055 *p++ = htonl(resp->f_wtmult);
1056 *p++ = htonl(resp->f_dtpref);
1057 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1058 *p++ = xdr_one;
1059 *p++ = xdr_zero;
1060 *p++ = htonl(resp->f_properties);
1061 }
1062
1063 return xdr_ressize_check(rqstp, p);
1064 }
1065
1066 /* PATHCONF */
1067 int
1068 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1069 struct nfsd3_pathconfres *resp)
1070 {
1071 *p++ = xdr_zero; /* no post_op_attr */
1072
1073 if (resp->status == 0) {
1074 *p++ = htonl(resp->p_link_max);
1075 *p++ = htonl(resp->p_name_max);
1076 *p++ = htonl(resp->p_no_trunc);
1077 *p++ = htonl(resp->p_chown_restricted);
1078 *p++ = htonl(resp->p_case_insensitive);
1079 *p++ = htonl(resp->p_case_preserving);
1080 }
1081
1082 return xdr_ressize_check(rqstp, p);
1083 }
1084
1085 /* COMMIT */
1086 int
1087 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1088 struct nfsd3_commitres *resp)
1089 {
1090 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1091
1092 p = encode_wcc_data(rqstp, p, &resp->fh);
1093 /* Write verifier */
1094 if (resp->status == 0) {
1095 *p++ = htonl(nn->nfssvc_boot.tv_sec);
1096 *p++ = htonl(nn->nfssvc_boot.tv_usec);
1097 }
1098 return xdr_ressize_check(rqstp, p);
1099 }
1100
1101 /*
1102 * XDR release functions
1103 */
1104 int
1105 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1106 struct nfsd3_attrstat *resp)
1107 {
1108 fh_put(&resp->fh);
1109 return 1;
1110 }
1111
1112 int
1113 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
1114 struct nfsd3_fhandle_pair *resp)
1115 {
1116 fh_put(&resp->fh1);
1117 fh_put(&resp->fh2);
1118 return 1;
1119 }
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