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PM / platform_bus: Allow runtime PM by default
[firewire-audio.git] / fs / nfsd / nfs3xdr.c
blob2a533a0af2a98ed91afb84e71669d328cb67a866
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 "xdr3.h"
11 #include "auth.h"
12
13 #define NFSDDBG_FACILITY NFSDDBG_XDR
14
15
16 /*
17 * Mapping of S_IF* types to NFS file types
18 */
19 static u32 nfs3_ftypes[] = {
20 NF3NON, NF3FIFO, NF3CHR, NF3BAD,
21 NF3DIR, NF3BAD, NF3BLK, NF3BAD,
22 NF3REG, NF3BAD, NF3LNK, NF3BAD,
23 NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
24 };
25
26 /*
27 * XDR functions for basic NFS types
28 */
29 static __be32 *
30 encode_time3(__be32 *p, struct timespec *time)
31 {
32 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
33 return p;
34 }
35
36 static __be32 *
37 decode_time3(__be32 *p, struct timespec *time)
38 {
39 time->tv_sec = ntohl(*p++);
40 time->tv_nsec = ntohl(*p++);
41 return p;
42 }
43
44 static __be32 *
45 decode_fh(__be32 *p, struct svc_fh *fhp)
46 {
47 unsigned int size;
48 fh_init(fhp, NFS3_FHSIZE);
49 size = ntohl(*p++);
50 if (size > NFS3_FHSIZE)
51 return NULL;
52
53 memcpy(&fhp->fh_handle.fh_base, p, size);
54 fhp->fh_handle.fh_size = size;
55 return p + XDR_QUADLEN(size);
56 }
57
58 /* Helper function for NFSv3 ACL code */
59 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
60 {
61 return decode_fh(p, fhp);
62 }
63
64 static __be32 *
65 encode_fh(__be32 *p, struct svc_fh *fhp)
66 {
67 unsigned int size = fhp->fh_handle.fh_size;
68 *p++ = htonl(size);
69 if (size) p[XDR_QUADLEN(size)-1]=0;
70 memcpy(p, &fhp->fh_handle.fh_base, size);
71 return p + XDR_QUADLEN(size);
72 }
73
74 /*
75 * Decode a file name and make sure that the path contains
76 * no slashes or null bytes.
77 */
78 static __be32 *
79 decode_filename(__be32 *p, char **namp, unsigned int *lenp)
80 {
81 char *name;
82 unsigned int i;
83
84 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
85 for (i = 0, name = *namp; i < *lenp; i++, name++) {
86 if (*name == '\0' || *name == '/')
87 return NULL;
88 }
89 }
90
91 return p;
92 }
93
94 static __be32 *
95 decode_sattr3(__be32 *p, struct iattr *iap)
96 {
97 u32 tmp;
98
99 iap->ia_valid = 0;
100
101 if (*p++) {
102 iap->ia_valid |= ATTR_MODE;
103 iap->ia_mode = ntohl(*p++);
104 }
105 if (*p++) {
106 iap->ia_valid |= ATTR_UID;
107 iap->ia_uid = ntohl(*p++);
108 }
109 if (*p++) {
110 iap->ia_valid |= ATTR_GID;
111 iap->ia_gid = ntohl(*p++);
112 }
113 if (*p++) {
114 u64 newsize;
115
116 iap->ia_valid |= ATTR_SIZE;
117 p = xdr_decode_hyper(p, &newsize);
118 if (newsize <= NFS_OFFSET_MAX)
119 iap->ia_size = newsize;
120 else
121 iap->ia_size = NFS_OFFSET_MAX;
122 }
123 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
124 iap->ia_valid |= ATTR_ATIME;
125 } else if (tmp == 2) { /* set to client time */
126 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
127 iap->ia_atime.tv_sec = ntohl(*p++);
128 iap->ia_atime.tv_nsec = ntohl(*p++);
129 }
130 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
131 iap->ia_valid |= ATTR_MTIME;
132 } else if (tmp == 2) { /* set to client time */
133 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
134 iap->ia_mtime.tv_sec = ntohl(*p++);
135 iap->ia_mtime.tv_nsec = ntohl(*p++);
136 }
137 return p;
138 }
139
140 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
141 {
142 u64 f;
143 switch(fsid_source(fhp)) {
144 default:
145 case FSIDSOURCE_DEV:
146 p = xdr_encode_hyper(p, (u64)huge_encode_dev
147 (fhp->fh_dentry->d_inode->i_sb->s_dev));
148 break;
149 case FSIDSOURCE_FSID:
150 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
151 break;
152 case FSIDSOURCE_UUID:
153 f = ((u64*)fhp->fh_export->ex_uuid)[0];
154 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
155 p = xdr_encode_hyper(p, f);
156 break;
157 }
158 return p;
159 }
160
161 static __be32 *
162 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
163 struct kstat *stat)
164 {
165 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
166 *p++ = htonl((u32) stat->mode);
167 *p++ = htonl((u32) stat->nlink);
168 *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
169 *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
170 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
171 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
172 } else {
173 p = xdr_encode_hyper(p, (u64) stat->size);
174 }
175 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
176 *p++ = htonl((u32) MAJOR(stat->rdev));
177 *p++ = htonl((u32) MINOR(stat->rdev));
178 p = encode_fsid(p, fhp);
179 p = xdr_encode_hyper(p, stat->ino);
180 p = encode_time3(p, &stat->atime);
181 p = encode_time3(p, &stat->mtime);
182 p = encode_time3(p, &stat->ctime);
183
184 return p;
185 }
186
187 static __be32 *
188 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
189 {
190 /* Attributes to follow */
191 *p++ = xdr_one;
192 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
193 }
194
195 /*
196 * Encode post-operation attributes.
197 * The inode may be NULL if the call failed because of a stale file
198 * handle. In this case, no attributes are returned.
199 */
200 static __be32 *
201 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
202 {
203 struct dentry *dentry = fhp->fh_dentry;
204 if (dentry && dentry->d_inode) {
205 int err;
206 struct kstat stat;
207
208 err = vfs_getattr(fhp->fh_export->ex_path.mnt, dentry, &stat);
209 if (!err) {
210 *p++ = xdr_one; /* attributes follow */
211 lease_get_mtime(dentry->d_inode, &stat.mtime);
212 return encode_fattr3(rqstp, p, fhp, &stat);
213 }
214 }
215 *p++ = xdr_zero;
216 return p;
217 }
218
219 /* Helper for NFSv3 ACLs */
220 __be32 *
221 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
222 {
223 return encode_post_op_attr(rqstp, p, fhp);
224 }
225
226 /*
227 * Enocde weak cache consistency data
228 */
229 static __be32 *
230 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
231 {
232 struct dentry *dentry = fhp->fh_dentry;
233
234 if (dentry && dentry->d_inode && fhp->fh_post_saved) {
235 if (fhp->fh_pre_saved) {
236 *p++ = xdr_one;
237 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
238 p = encode_time3(p, &fhp->fh_pre_mtime);
239 p = encode_time3(p, &fhp->fh_pre_ctime);
240 } else {
241 *p++ = xdr_zero;
242 }
243 return encode_saved_post_attr(rqstp, p, fhp);
244 }
245 /* no pre- or post-attrs */
246 *p++ = xdr_zero;
247 return encode_post_op_attr(rqstp, p, fhp);
248 }
249
250 /*
251 * Fill in the post_op attr for the wcc data
252 */
253 void fill_post_wcc(struct svc_fh *fhp)
254 {
255 int err;
256
257 if (fhp->fh_post_saved)
258 printk("nfsd: inode locked twice during operation.\n");
259
260 err = vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry,
261 &fhp->fh_post_attr);
262 fhp->fh_post_change = fhp->fh_dentry->d_inode->i_version;
263 if (err)
264 fhp->fh_post_saved = 0;
265 else
266 fhp->fh_post_saved = 1;
267 }
268
269 /*
270 * XDR decode functions
271 */
272 int
273 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
274 {
275 if (!(p = decode_fh(p, &args->fh)))
276 return 0;
277 return xdr_argsize_check(rqstp, p);
278 }
279
280 int
281 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
282 struct nfsd3_sattrargs *args)
283 {
284 if (!(p = decode_fh(p, &args->fh)))
285 return 0;
286 p = decode_sattr3(p, &args->attrs);
287
288 if ((args->check_guard = ntohl(*p++)) != 0) {
289 struct timespec time;
290 p = decode_time3(p, &time);
291 args->guardtime = time.tv_sec;
292 }
293
294 return xdr_argsize_check(rqstp, p);
295 }
296
297 int
298 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
299 struct nfsd3_diropargs *args)
300 {
301 if (!(p = decode_fh(p, &args->fh))
302 || !(p = decode_filename(p, &args->name, &args->len)))
303 return 0;
304
305 return xdr_argsize_check(rqstp, p);
306 }
307
308 int
309 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
310 struct nfsd3_accessargs *args)
311 {
312 if (!(p = decode_fh(p, &args->fh)))
313 return 0;
314 args->access = ntohl(*p++);
315
316 return xdr_argsize_check(rqstp, p);
317 }
318
319 int
320 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
321 struct nfsd3_readargs *args)
322 {
323 unsigned int len;
324 int v,pn;
325 u32 max_blocksize = svc_max_payload(rqstp);
326
327 if (!(p = decode_fh(p, &args->fh)))
328 return 0;
329 p = xdr_decode_hyper(p, &args->offset);
330
331 len = args->count = ntohl(*p++);
332
333 if (len > max_blocksize)
334 len = max_blocksize;
335
336 /* set up the kvec */
337 v=0;
338 while (len > 0) {
339 pn = rqstp->rq_resused++;
340 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
341 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
342 len -= rqstp->rq_vec[v].iov_len;
343 v++;
344 }
345 args->vlen = v;
346 return xdr_argsize_check(rqstp, p);
347 }
348
349 int
350 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
351 struct nfsd3_writeargs *args)
352 {
353 unsigned int len, v, hdr, dlen;
354 u32 max_blocksize = svc_max_payload(rqstp);
355
356 if (!(p = decode_fh(p, &args->fh)))
357 return 0;
358 p = xdr_decode_hyper(p, &args->offset);
359
360 args->count = ntohl(*p++);
361 args->stable = ntohl(*p++);
362 len = args->len = ntohl(*p++);
363 /*
364 * The count must equal the amount of data passed.
365 */
366 if (args->count != args->len)
367 return 0;
368
369 /*
370 * Check to make sure that we got the right number of
371 * bytes.
372 */
373 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
374 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
375 - hdr;
376 /*
377 * Round the length of the data which was specified up to
378 * the next multiple of XDR units and then compare that
379 * against the length which was actually received.
380 * Note that when RPCSEC/GSS (for example) is used, the
381 * data buffer can be padded so dlen might be larger
382 * than required. It must never be smaller.
383 */
384 if (dlen < XDR_QUADLEN(len)*4)
385 return 0;
386
387 if (args->count > max_blocksize) {
388 args->count = max_blocksize;
389 len = args->len = max_blocksize;
390 }
391 rqstp->rq_vec[0].iov_base = (void*)p;
392 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
393 v = 0;
394 while (len > rqstp->rq_vec[v].iov_len) {
395 len -= rqstp->rq_vec[v].iov_len;
396 v++;
397 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
398 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
399 }
400 rqstp->rq_vec[v].iov_len = len;
401 args->vlen = v + 1;
402 return 1;
403 }
404
405 int
406 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
407 struct nfsd3_createargs *args)
408 {
409 if (!(p = decode_fh(p, &args->fh))
410 || !(p = decode_filename(p, &args->name, &args->len)))
411 return 0;
412
413 switch (args->createmode = ntohl(*p++)) {
414 case NFS3_CREATE_UNCHECKED:
415 case NFS3_CREATE_GUARDED:
416 p = decode_sattr3(p, &args->attrs);
417 break;
418 case NFS3_CREATE_EXCLUSIVE:
419 args->verf = p;
420 p += 2;
421 break;
422 default:
423 return 0;
424 }
425
426 return xdr_argsize_check(rqstp, p);
427 }
428 int
429 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
430 struct nfsd3_createargs *args)
431 {
432 if (!(p = decode_fh(p, &args->fh)) ||
433 !(p = decode_filename(p, &args->name, &args->len)))
434 return 0;
435 p = decode_sattr3(p, &args->attrs);
436
437 return xdr_argsize_check(rqstp, p);
438 }
439
440 int
441 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
442 struct nfsd3_symlinkargs *args)
443 {
444 unsigned int len, avail;
445 char *old, *new;
446 struct kvec *vec;
447
448 if (!(p = decode_fh(p, &args->ffh)) ||
449 !(p = decode_filename(p, &args->fname, &args->flen))
450 )
451 return 0;
452 p = decode_sattr3(p, &args->attrs);
453
454 /* now decode the pathname, which might be larger than the first page.
455 * As we have to check for nul's anyway, we copy it into a new page
456 * This page appears in the rq_res.pages list, but as pages_len is always
457 * 0, it won't get in the way
458 */
459 len = ntohl(*p++);
460 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
461 return 0;
462 args->tname = new =
463 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
464 args->tlen = len;
465 /* first copy and check from the first page */
466 old = (char*)p;
467 vec = &rqstp->rq_arg.head[0];
468 avail = vec->iov_len - (old - (char*)vec->iov_base);
469 while (len && avail && *old) {
470 *new++ = *old++;
471 len--;
472 avail--;
473 }
474 /* now copy next page if there is one */
475 if (len && !avail && rqstp->rq_arg.page_len) {
476 avail = rqstp->rq_arg.page_len;
477 if (avail > PAGE_SIZE)
478 avail = PAGE_SIZE;
479 old = page_address(rqstp->rq_arg.pages[0]);
480 }
481 while (len && avail && *old) {
482 *new++ = *old++;
483 len--;
484 avail--;
485 }
486 *new = '\0';
487 if (len)
488 return 0;
489
490 return 1;
491 }
492
493 int
494 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
495 struct nfsd3_mknodargs *args)
496 {
497 if (!(p = decode_fh(p, &args->fh))
498 || !(p = decode_filename(p, &args->name, &args->len)))
499 return 0;
500
501 args->ftype = ntohl(*p++);
502
503 if (args->ftype == NF3BLK || args->ftype == NF3CHR
504 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
505 p = decode_sattr3(p, &args->attrs);
506
507 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
508 args->major = ntohl(*p++);
509 args->minor = ntohl(*p++);
510 }
511
512 return xdr_argsize_check(rqstp, p);
513 }
514
515 int
516 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
517 struct nfsd3_renameargs *args)
518 {
519 if (!(p = decode_fh(p, &args->ffh))
520 || !(p = decode_filename(p, &args->fname, &args->flen))
521 || !(p = decode_fh(p, &args->tfh))
522 || !(p = decode_filename(p, &args->tname, &args->tlen)))
523 return 0;
524
525 return xdr_argsize_check(rqstp, p);
526 }
527
528 int
529 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
530 struct nfsd3_readlinkargs *args)
531 {
532 if (!(p = decode_fh(p, &args->fh)))
533 return 0;
534 args->buffer =
535 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
536
537 return xdr_argsize_check(rqstp, p);
538 }
539
540 int
541 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
542 struct nfsd3_linkargs *args)
543 {
544 if (!(p = decode_fh(p, &args->ffh))
545 || !(p = decode_fh(p, &args->tfh))
546 || !(p = decode_filename(p, &args->tname, &args->tlen)))
547 return 0;
548
549 return xdr_argsize_check(rqstp, p);
550 }
551
552 int
553 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
554 struct nfsd3_readdirargs *args)
555 {
556 if (!(p = decode_fh(p, &args->fh)))
557 return 0;
558 p = xdr_decode_hyper(p, &args->cookie);
559 args->verf = p; p += 2;
560 args->dircount = ~0;
561 args->count = ntohl(*p++);
562
563 if (args->count > PAGE_SIZE)
564 args->count = PAGE_SIZE;
565
566 args->buffer =
567 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
568
569 return xdr_argsize_check(rqstp, p);
570 }
571
572 int
573 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
574 struct nfsd3_readdirargs *args)
575 {
576 int len, pn;
577 u32 max_blocksize = svc_max_payload(rqstp);
578
579 if (!(p = decode_fh(p, &args->fh)))
580 return 0;
581 p = xdr_decode_hyper(p, &args->cookie);
582 args->verf = p; p += 2;
583 args->dircount = ntohl(*p++);
584 args->count = ntohl(*p++);
585
586 len = (args->count > max_blocksize) ? max_blocksize :
587 args->count;
588 args->count = len;
589
590 while (len > 0) {
591 pn = rqstp->rq_resused++;
592 if (!args->buffer)
593 args->buffer = page_address(rqstp->rq_respages[pn]);
594 len -= PAGE_SIZE;
595 }
596
597 return xdr_argsize_check(rqstp, p);
598 }
599
600 int
601 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
602 struct nfsd3_commitargs *args)
603 {
604 if (!(p = decode_fh(p, &args->fh)))
605 return 0;
606 p = xdr_decode_hyper(p, &args->offset);
607 args->count = ntohl(*p++);
608
609 return xdr_argsize_check(rqstp, p);
610 }
611
612 /*
613 * XDR encode functions
614 */
615 /*
616 * There must be an encoding function for void results so svc_process
617 * will work properly.
618 */
619 int
620 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
621 {
622 return xdr_ressize_check(rqstp, p);
623 }
624
625 /* GETATTR */
626 int
627 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
628 struct nfsd3_attrstat *resp)
629 {
630 if (resp->status == 0) {
631 lease_get_mtime(resp->fh.fh_dentry->d_inode,
632 &resp->stat.mtime);
633 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
634 }
635 return xdr_ressize_check(rqstp, p);
636 }
637
638 /* SETATTR, REMOVE, RMDIR */
639 int
640 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
641 struct nfsd3_attrstat *resp)
642 {
643 p = encode_wcc_data(rqstp, p, &resp->fh);
644 return xdr_ressize_check(rqstp, p);
645 }
646
647 /* LOOKUP */
648 int
649 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
650 struct nfsd3_diropres *resp)
651 {
652 if (resp->status == 0) {
653 p = encode_fh(p, &resp->fh);
654 p = encode_post_op_attr(rqstp, p, &resp->fh);
655 }
656 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
657 return xdr_ressize_check(rqstp, p);
658 }
659
660 /* ACCESS */
661 int
662 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
663 struct nfsd3_accessres *resp)
664 {
665 p = encode_post_op_attr(rqstp, p, &resp->fh);
666 if (resp->status == 0)
667 *p++ = htonl(resp->access);
668 return xdr_ressize_check(rqstp, p);
669 }
670
671 /* READLINK */
672 int
673 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
674 struct nfsd3_readlinkres *resp)
675 {
676 p = encode_post_op_attr(rqstp, p, &resp->fh);
677 if (resp->status == 0) {
678 *p++ = htonl(resp->len);
679 xdr_ressize_check(rqstp, p);
680 rqstp->rq_res.page_len = resp->len;
681 if (resp->len & 3) {
682 /* need to pad the tail */
683 rqstp->rq_res.tail[0].iov_base = p;
684 *p = 0;
685 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
686 }
687 return 1;
688 } else
689 return xdr_ressize_check(rqstp, p);
690 }
691
692 /* READ */
693 int
694 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
695 struct nfsd3_readres *resp)
696 {
697 p = encode_post_op_attr(rqstp, p, &resp->fh);
698 if (resp->status == 0) {
699 *p++ = htonl(resp->count);
700 *p++ = htonl(resp->eof);
701 *p++ = htonl(resp->count); /* xdr opaque count */
702 xdr_ressize_check(rqstp, p);
703 /* now update rqstp->rq_res to reflect data aswell */
704 rqstp->rq_res.page_len = resp->count;
705 if (resp->count & 3) {
706 /* need to pad the tail */
707 rqstp->rq_res.tail[0].iov_base = p;
708 *p = 0;
709 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
710 }
711 return 1;
712 } else
713 return xdr_ressize_check(rqstp, p);
714 }
715
716 /* WRITE */
717 int
718 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
719 struct nfsd3_writeres *resp)
720 {
721 p = encode_wcc_data(rqstp, p, &resp->fh);
722 if (resp->status == 0) {
723 *p++ = htonl(resp->count);
724 *p++ = htonl(resp->committed);
725 *p++ = htonl(nfssvc_boot.tv_sec);
726 *p++ = htonl(nfssvc_boot.tv_usec);
727 }
728 return xdr_ressize_check(rqstp, p);
729 }
730
731 /* CREATE, MKDIR, SYMLINK, MKNOD */
732 int
733 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
734 struct nfsd3_diropres *resp)
735 {
736 if (resp->status == 0) {
737 *p++ = xdr_one;
738 p = encode_fh(p, &resp->fh);
739 p = encode_post_op_attr(rqstp, p, &resp->fh);
740 }
741 p = encode_wcc_data(rqstp, p, &resp->dirfh);
742 return xdr_ressize_check(rqstp, p);
743 }
744
745 /* RENAME */
746 int
747 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
748 struct nfsd3_renameres *resp)
749 {
750 p = encode_wcc_data(rqstp, p, &resp->ffh);
751 p = encode_wcc_data(rqstp, p, &resp->tfh);
752 return xdr_ressize_check(rqstp, p);
753 }
754
755 /* LINK */
756 int
757 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
758 struct nfsd3_linkres *resp)
759 {
760 p = encode_post_op_attr(rqstp, p, &resp->fh);
761 p = encode_wcc_data(rqstp, p, &resp->tfh);
762 return xdr_ressize_check(rqstp, p);
763 }
764
765 /* READDIR */
766 int
767 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
768 struct nfsd3_readdirres *resp)
769 {
770 p = encode_post_op_attr(rqstp, p, &resp->fh);
771
772 if (resp->status == 0) {
773 /* stupid readdir cookie */
774 memcpy(p, resp->verf, 8); p += 2;
775 xdr_ressize_check(rqstp, p);
776 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
777 return 1; /*No room for trailer */
778 rqstp->rq_res.page_len = (resp->count) << 2;
779
780 /* add the 'tail' to the end of the 'head' page - page 0. */
781 rqstp->rq_res.tail[0].iov_base = p;
782 *p++ = 0; /* no more entries */
783 *p++ = htonl(resp->common.err == nfserr_eof);
784 rqstp->rq_res.tail[0].iov_len = 2<<2;
785 return 1;
786 } else
787 return xdr_ressize_check(rqstp, p);
788 }
789
790 static __be32 *
791 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
792 int namlen, u64 ino)
793 {
794 *p++ = xdr_one; /* mark entry present */
795 p = xdr_encode_hyper(p, ino); /* file id */
796 p = xdr_encode_array(p, name, namlen);/* name length & name */
797
798 cd->offset = p; /* remember pointer */
799 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
800
801 return p;
802 }
803
804 static int
805 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
806 const char *name, int namlen)
807 {
808 struct svc_export *exp;
809 struct dentry *dparent, *dchild;
810 int rv = 0;
811
812 dparent = cd->fh.fh_dentry;
813 exp = cd->fh.fh_export;
814
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 -ENOENT;
822 }
823 } else
824 dchild = dget(dparent);
825 } else
826 dchild = lookup_one_len(name, dparent, namlen);
827 if (IS_ERR(dchild))
828 return -ENOENT;
829 rv = -ENOENT;
830 if (d_mountpoint(dchild))
831 goto out;
832 rv = fh_compose(fhp, exp, dchild, &cd->fh);
833 if (rv)
834 goto out;
835 if (!dchild->d_inode)
836 goto out;
837 rv = 0;
838 out:
839 dput(dchild);
840 return rv;
841 }
842
843 __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen)
844 {
845 struct svc_fh fh;
846 int 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 int pn; /* current page number */
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 (pn=1; pn < cd->rqstp->rq_resused; pn++) {
921 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
922
923 if (((caddr_t)cd->buffer >= curr_page_addr) &&
924 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
925 break;
926 }
927
928 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
929 /* encode entry in current page */
930
931 p = encode_entry_baggage(cd, p, name, namlen, ino);
932
933 if (plus)
934 p = encode_entryplus_baggage(cd, p, name, namlen);
935 num_entry_words = p - cd->buffer;
936 } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
937 /* temporarily encode entry into next page, then move back to
938 * current and next page in rq_respages[] */
939 __be32 *p1, *tmp;
940 int len1, len2;
941
942 /* grab next page for temporary storage of entry */
943 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
944
945 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
946
947 if (plus)
948 p1 = encode_entryplus_baggage(cd, p1, name, namlen);
949
950 /* determine entry word length and lengths to go in pages */
951 num_entry_words = p1 - tmp;
952 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
953 if ((num_entry_words << 2) < len1) {
954 /* the actual number of words in the entry is less
955 * than elen and can still fit in the current page
956 */
957 memmove(p, tmp, num_entry_words << 2);
958 p += num_entry_words;
959
960 /* update offset */
961 cd->offset = cd->buffer + (cd->offset - tmp);
962 } else {
963 unsigned int offset_r = (cd->offset - tmp) << 2;
964
965 /* update pointer to offset location.
966 * This is a 64bit quantity, so we need to
967 * deal with 3 cases:
968 * - entirely in first page
969 * - entirely in second page
970 * - 4 bytes in each page
971 */
972 if (offset_r + 8 <= len1) {
973 cd->offset = p + (cd->offset - tmp);
974 } else if (offset_r >= len1) {
975 cd->offset -= len1 >> 2;
976 } else {
977 /* sitting on the fence */
978 BUG_ON(offset_r != len1 - 4);
979 cd->offset = p + (cd->offset - tmp);
980 cd->offset1 = tmp;
981 }
982
983 len2 = (num_entry_words << 2) - len1;
984
985 /* move from temp page to current and next pages */
986 memmove(p, tmp, len1);
987 memmove(tmp, (caddr_t)tmp+len1, len2);
988
989 p = tmp + (len2 >> 2);
990 }
991 }
992 else {
993 cd->common.err = nfserr_toosmall;
994 return -EINVAL;
995 }
996
997 cd->buflen -= num_entry_words;
998 cd->buffer = p;
999 cd->common.err = nfs_ok;
1000 return 0;
1001
1002 }
1003
1004 int
1005 nfs3svc_encode_entry(void *cd, const char *name,
1006 int namlen, loff_t offset, u64 ino, unsigned int d_type)
1007 {
1008 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1009 }
1010
1011 int
1012 nfs3svc_encode_entry_plus(void *cd, const char *name,
1013 int namlen, loff_t offset, u64 ino,
1014 unsigned int d_type)
1015 {
1016 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1017 }
1018
1019 /* FSSTAT */
1020 int
1021 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1022 struct nfsd3_fsstatres *resp)
1023 {
1024 struct kstatfs *s = &resp->stats;
1025 u64 bs = s->f_bsize;
1026
1027 *p++ = xdr_zero; /* no post_op_attr */
1028
1029 if (resp->status == 0) {
1030 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1031 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1032 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1033 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1034 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1035 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1036 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1037 }
1038 return xdr_ressize_check(rqstp, p);
1039 }
1040
1041 /* FSINFO */
1042 int
1043 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1044 struct nfsd3_fsinfores *resp)
1045 {
1046 *p++ = xdr_zero; /* no post_op_attr */
1047
1048 if (resp->status == 0) {
1049 *p++ = htonl(resp->f_rtmax);
1050 *p++ = htonl(resp->f_rtpref);
1051 *p++ = htonl(resp->f_rtmult);
1052 *p++ = htonl(resp->f_wtmax);
1053 *p++ = htonl(resp->f_wtpref);
1054 *p++ = htonl(resp->f_wtmult);
1055 *p++ = htonl(resp->f_dtpref);
1056 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1057 *p++ = xdr_one;
1058 *p++ = xdr_zero;
1059 *p++ = htonl(resp->f_properties);
1060 }
1061
1062 return xdr_ressize_check(rqstp, p);
1063 }
1064
1065 /* PATHCONF */
1066 int
1067 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1068 struct nfsd3_pathconfres *resp)
1069 {
1070 *p++ = xdr_zero; /* no post_op_attr */
1071
1072 if (resp->status == 0) {
1073 *p++ = htonl(resp->p_link_max);
1074 *p++ = htonl(resp->p_name_max);
1075 *p++ = htonl(resp->p_no_trunc);
1076 *p++ = htonl(resp->p_chown_restricted);
1077 *p++ = htonl(resp->p_case_insensitive);
1078 *p++ = htonl(resp->p_case_preserving);
1079 }
1080
1081 return xdr_ressize_check(rqstp, p);
1082 }
1083
1084 /* COMMIT */
1085 int
1086 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1087 struct nfsd3_commitres *resp)
1088 {
1089 p = encode_wcc_data(rqstp, p, &resp->fh);
1090 /* Write verifier */
1091 if (resp->status == 0) {
1092 *p++ = htonl(nfssvc_boot.tv_sec);
1093 *p++ = htonl(nfssvc_boot.tv_usec);
1094 }
1095 return xdr_ressize_check(rqstp, p);
1096 }
1097
1098 /*
1099 * XDR release functions
1100 */
1101 int
1102 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1103 struct nfsd3_attrstat *resp)
1104 {
1105 fh_put(&resp->fh);
1106 return 1;
1107 }
1108
1109 int
1110 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
1111 struct nfsd3_fhandle_pair *resp)
1112 {
1113 fh_put(&resp->fh1);
1114 fh_put(&resp->fh2);
1115 return 1;
1116 }
AMDTP streaming driver for the Linux FireWire stack (Juju)