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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 */
19static 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 */
29static __be32 *
30encode_time3(__be32 *p, struct timespec *time)
31{
32 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
33 return p;
34}
35
36static __be32 *
37decode_time3(__be32 *p, struct timespec *time)
38{
39 time->tv_sec = ntohl(*p++);
40 time->tv_nsec = ntohl(*p++);
41 return p;
42}
43
44static __be32 *
45decode_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
64static __be32 *
65encode_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 */
78static __be32 *
79decode_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
94static __be32 *
95decode_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
140static __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
161static __be32 *
162encode_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
187static __be32 *
188encode_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 */
200static __be32 *
201encode_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 *
221nfs3svc_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 */
229static __be32 *
230encode_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 */
253void 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 /* Grab the ctime anyway - set_change_info might use it */
266 fhp->fh_post_attr.ctime = fhp->fh_dentry->d_inode->i_ctime;
267 } else
268 fhp->fh_post_saved = 1;
269}
270
271/*
272 * XDR decode functions
273 */
274int
275nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
276{
277 if (!(p = decode_fh(p, &args->fh)))
278 return 0;
279 return xdr_argsize_check(rqstp, p);
280}
281
282int
283nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
284 struct nfsd3_sattrargs *args)
285{
286 if (!(p = decode_fh(p, &args->fh)))
287 return 0;
288 p = decode_sattr3(p, &args->attrs);
289
290 if ((args->check_guard = ntohl(*p++)) != 0) {
291 struct timespec time;
292 p = decode_time3(p, &time);
293 args->guardtime = time.tv_sec;
294 }
295
296 return xdr_argsize_check(rqstp, p);
297}
298
299int
300nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
301 struct nfsd3_diropargs *args)
302{
303 if (!(p = decode_fh(p, &args->fh))
304 || !(p = decode_filename(p, &args->name, &args->len)))
305 return 0;
306
307 return xdr_argsize_check(rqstp, p);
308}
309
310int
311nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
312 struct nfsd3_accessargs *args)
313{
314 if (!(p = decode_fh(p, &args->fh)))
315 return 0;
316 args->access = ntohl(*p++);
317
318 return xdr_argsize_check(rqstp, p);
319}
320
321int
322nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
323 struct nfsd3_readargs *args)
324{
325 unsigned int len;
326 int v,pn;
327 u32 max_blocksize = svc_max_payload(rqstp);
328
329 if (!(p = decode_fh(p, &args->fh)))
330 return 0;
331 p = xdr_decode_hyper(p, &args->offset);
332
333 len = args->count = ntohl(*p++);
334
335 if (len > max_blocksize)
336 len = max_blocksize;
337
338 /* set up the kvec */
339 v=0;
340 while (len > 0) {
341 pn = rqstp->rq_resused++;
342 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
343 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
344 len -= rqstp->rq_vec[v].iov_len;
345 v++;
346 }
347 args->vlen = v;
348 return xdr_argsize_check(rqstp, p);
349}
350
351int
352nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
353 struct nfsd3_writeargs *args)
354{
355 unsigned int len, v, hdr, dlen;
356 u32 max_blocksize = svc_max_payload(rqstp);
357
358 if (!(p = decode_fh(p, &args->fh)))
359 return 0;
360 p = xdr_decode_hyper(p, &args->offset);
361
362 args->count = ntohl(*p++);
363 args->stable = ntohl(*p++);
364 len = args->len = ntohl(*p++);
365 /*
366 * The count must equal the amount of data passed.
367 */
368 if (args->count != args->len)
369 return 0;
370
371 /*
372 * Check to make sure that we got the right number of
373 * bytes.
374 */
375 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
376 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
377 - hdr;
378 /*
379 * Round the length of the data which was specified up to
380 * the next multiple of XDR units and then compare that
381 * against the length which was actually received.
382 * Note that when RPCSEC/GSS (for example) is used, the
383 * data buffer can be padded so dlen might be larger
384 * than required. It must never be smaller.
385 */
386 if (dlen < XDR_QUADLEN(len)*4)
387 return 0;
388
389 if (args->count > max_blocksize) {
390 args->count = max_blocksize;
391 len = args->len = max_blocksize;
392 }
393 rqstp->rq_vec[0].iov_base = (void*)p;
394 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
395 v = 0;
396 while (len > rqstp->rq_vec[v].iov_len) {
397 len -= rqstp->rq_vec[v].iov_len;
398 v++;
399 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
400 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
401 }
402 rqstp->rq_vec[v].iov_len = len;
403 args->vlen = v + 1;
404 return 1;
405}
406
407int
408nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
409 struct nfsd3_createargs *args)
410{
411 if (!(p = decode_fh(p, &args->fh))
412 || !(p = decode_filename(p, &args->name, &args->len)))
413 return 0;
414
415 switch (args->createmode = ntohl(*p++)) {
416 case NFS3_CREATE_UNCHECKED:
417 case NFS3_CREATE_GUARDED:
418 p = decode_sattr3(p, &args->attrs);
419 break;
420 case NFS3_CREATE_EXCLUSIVE:
421 args->verf = p;
422 p += 2;
423 break;
424 default:
425 return 0;
426 }
427
428 return xdr_argsize_check(rqstp, p);
429}
430int
431nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
432 struct nfsd3_createargs *args)
433{
434 if (!(p = decode_fh(p, &args->fh)) ||
435 !(p = decode_filename(p, &args->name, &args->len)))
436 return 0;
437 p = decode_sattr3(p, &args->attrs);
438
439 return xdr_argsize_check(rqstp, p);
440}
441
442int
443nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
444 struct nfsd3_symlinkargs *args)
445{
446 unsigned int len, avail;
447 char *old, *new;
448 struct kvec *vec;
449
450 if (!(p = decode_fh(p, &args->ffh)) ||
451 !(p = decode_filename(p, &args->fname, &args->flen))
452 )
453 return 0;
454 p = decode_sattr3(p, &args->attrs);
455
456 /* now decode the pathname, which might be larger than the first page.
457 * As we have to check for nul's anyway, we copy it into a new page
458 * This page appears in the rq_res.pages list, but as pages_len is always
459 * 0, it won't get in the way
460 */
461 len = ntohl(*p++);
462 if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
463 return 0;
464 args->tname = new =
465 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
466 args->tlen = len;
467 /* first copy and check from the first page */
468 old = (char*)p;
469 vec = &rqstp->rq_arg.head[0];
470 avail = vec->iov_len - (old - (char*)vec->iov_base);
471 while (len && avail && *old) {
472 *new++ = *old++;
473 len--;
474 avail--;
475 }
476 /* now copy next page if there is one */
477 if (len && !avail && rqstp->rq_arg.page_len) {
478 avail = rqstp->rq_arg.page_len;
479 if (avail > PAGE_SIZE)
480 avail = PAGE_SIZE;
481 old = page_address(rqstp->rq_arg.pages[0]);
482 }
483 while (len && avail && *old) {
484 *new++ = *old++;
485 len--;
486 avail--;
487 }
488 *new = '\0';
489 if (len)
490 return 0;
491
492 return 1;
493}
494
495int
496nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
497 struct nfsd3_mknodargs *args)
498{
499 if (!(p = decode_fh(p, &args->fh))
500 || !(p = decode_filename(p, &args->name, &args->len)))
501 return 0;
502
503 args->ftype = ntohl(*p++);
504
505 if (args->ftype == NF3BLK || args->ftype == NF3CHR
506 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
507 p = decode_sattr3(p, &args->attrs);
508
509 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
510 args->major = ntohl(*p++);
511 args->minor = ntohl(*p++);
512 }
513
514 return xdr_argsize_check(rqstp, p);
515}
516
517int
518nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
519 struct nfsd3_renameargs *args)
520{
521 if (!(p = decode_fh(p, &args->ffh))
522 || !(p = decode_filename(p, &args->fname, &args->flen))
523 || !(p = decode_fh(p, &args->tfh))
524 || !(p = decode_filename(p, &args->tname, &args->tlen)))
525 return 0;
526
527 return xdr_argsize_check(rqstp, p);
528}
529
530int
531nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
532 struct nfsd3_readlinkargs *args)
533{
534 if (!(p = decode_fh(p, &args->fh)))
535 return 0;
536 args->buffer =
537 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
538
539 return xdr_argsize_check(rqstp, p);
540}
541
542int
543nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
544 struct nfsd3_linkargs *args)
545{
546 if (!(p = decode_fh(p, &args->ffh))
547 || !(p = decode_fh(p, &args->tfh))
548 || !(p = decode_filename(p, &args->tname, &args->tlen)))
549 return 0;
550
551 return xdr_argsize_check(rqstp, p);
552}
553
554int
555nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
556 struct nfsd3_readdirargs *args)
557{
558 if (!(p = decode_fh(p, &args->fh)))
559 return 0;
560 p = xdr_decode_hyper(p, &args->cookie);
561 args->verf = p; p += 2;
562 args->dircount = ~0;
563 args->count = ntohl(*p++);
564
565 if (args->count > PAGE_SIZE)
566 args->count = PAGE_SIZE;
567
568 args->buffer =
569 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
570
571 return xdr_argsize_check(rqstp, p);
572}
573
574int
575nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
576 struct nfsd3_readdirargs *args)
577{
578 int len, pn;
579 u32 max_blocksize = svc_max_payload(rqstp);
580
581 if (!(p = decode_fh(p, &args->fh)))
582 return 0;
583 p = xdr_decode_hyper(p, &args->cookie);
584 args->verf = p; p += 2;
585 args->dircount = ntohl(*p++);
586 args->count = ntohl(*p++);
587
588 len = (args->count > max_blocksize) ? max_blocksize :
589 args->count;
590 args->count = len;
591
592 while (len > 0) {
593 pn = rqstp->rq_resused++;
594 if (!args->buffer)
595 args->buffer = page_address(rqstp->rq_respages[pn]);
596 len -= PAGE_SIZE;
597 }
598
599 return xdr_argsize_check(rqstp, p);
600}
601
602int
603nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
604 struct nfsd3_commitargs *args)
605{
606 if (!(p = decode_fh(p, &args->fh)))
607 return 0;
608 p = xdr_decode_hyper(p, &args->offset);
609 args->count = ntohl(*p++);
610
611 return xdr_argsize_check(rqstp, p);
612}
613
614/*
615 * XDR encode functions
616 */
617/*
618 * There must be an encoding function for void results so svc_process
619 * will work properly.
620 */
621int
622nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
623{
624 return xdr_ressize_check(rqstp, p);
625}
626
627/* GETATTR */
628int
629nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
630 struct nfsd3_attrstat *resp)
631{
632 if (resp->status == 0) {
633 lease_get_mtime(resp->fh.fh_dentry->d_inode,
634 &resp->stat.mtime);
635 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
636 }
637 return xdr_ressize_check(rqstp, p);
638}
639
640/* SETATTR, REMOVE, RMDIR */
641int
642nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
643 struct nfsd3_attrstat *resp)
644{
645 p = encode_wcc_data(rqstp, p, &resp->fh);
646 return xdr_ressize_check(rqstp, p);
647}
648
649/* LOOKUP */
650int
651nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
652 struct nfsd3_diropres *resp)
653{
654 if (resp->status == 0) {
655 p = encode_fh(p, &resp->fh);
656 p = encode_post_op_attr(rqstp, p, &resp->fh);
657 }
658 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
659 return xdr_ressize_check(rqstp, p);
660}
661
662/* ACCESS */
663int
664nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
665 struct nfsd3_accessres *resp)
666{
667 p = encode_post_op_attr(rqstp, p, &resp->fh);
668 if (resp->status == 0)
669 *p++ = htonl(resp->access);
670 return xdr_ressize_check(rqstp, p);
671}
672
673/* READLINK */
674int
675nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
676 struct nfsd3_readlinkres *resp)
677{
678 p = encode_post_op_attr(rqstp, p, &resp->fh);
679 if (resp->status == 0) {
680 *p++ = htonl(resp->len);
681 xdr_ressize_check(rqstp, p);
682 rqstp->rq_res.page_len = resp->len;
683 if (resp->len & 3) {
684 /* need to pad the tail */
685 rqstp->rq_res.tail[0].iov_base = p;
686 *p = 0;
687 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
688 }
689 return 1;
690 } else
691 return xdr_ressize_check(rqstp, p);
692}
693
694/* READ */
695int
696nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
697 struct nfsd3_readres *resp)
698{
699 p = encode_post_op_attr(rqstp, p, &resp->fh);
700 if (resp->status == 0) {
701 *p++ = htonl(resp->count);
702 *p++ = htonl(resp->eof);
703 *p++ = htonl(resp->count); /* xdr opaque count */
704 xdr_ressize_check(rqstp, p);
705 /* now update rqstp->rq_res to reflect data as well */
706 rqstp->rq_res.page_len = resp->count;
707 if (resp->count & 3) {
708 /* need to pad the tail */
709 rqstp->rq_res.tail[0].iov_base = p;
710 *p = 0;
711 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
712 }
713 return 1;
714 } else
715 return xdr_ressize_check(rqstp, p);
716}
717
718/* WRITE */
719int
720nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
721 struct nfsd3_writeres *resp)
722{
723 p = encode_wcc_data(rqstp, p, &resp->fh);
724 if (resp->status == 0) {
725 *p++ = htonl(resp->count);
726 *p++ = htonl(resp->committed);
727 *p++ = htonl(nfssvc_boot.tv_sec);
728 *p++ = htonl(nfssvc_boot.tv_usec);
729 }
730 return xdr_ressize_check(rqstp, p);
731}
732
733/* CREATE, MKDIR, SYMLINK, MKNOD */
734int
735nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
736 struct nfsd3_diropres *resp)
737{
738 if (resp->status == 0) {
739 *p++ = xdr_one;
740 p = encode_fh(p, &resp->fh);
741 p = encode_post_op_attr(rqstp, p, &resp->fh);
742 }
743 p = encode_wcc_data(rqstp, p, &resp->dirfh);
744 return xdr_ressize_check(rqstp, p);
745}
746
747/* RENAME */
748int
749nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
750 struct nfsd3_renameres *resp)
751{
752 p = encode_wcc_data(rqstp, p, &resp->ffh);
753 p = encode_wcc_data(rqstp, p, &resp->tfh);
754 return xdr_ressize_check(rqstp, p);
755}
756
757/* LINK */
758int
759nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
760 struct nfsd3_linkres *resp)
761{
762 p = encode_post_op_attr(rqstp, p, &resp->fh);
763 p = encode_wcc_data(rqstp, p, &resp->tfh);
764 return xdr_ressize_check(rqstp, p);
765}
766
767/* READDIR */
768int
769nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
770 struct nfsd3_readdirres *resp)
771{
772 p = encode_post_op_attr(rqstp, p, &resp->fh);
773
774 if (resp->status == 0) {
775 /* stupid readdir cookie */
776 memcpy(p, resp->verf, 8); p += 2;
777 xdr_ressize_check(rqstp, p);
778 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
779 return 1; /*No room for trailer */
780 rqstp->rq_res.page_len = (resp->count) << 2;
781
782 /* add the 'tail' to the end of the 'head' page - page 0. */
783 rqstp->rq_res.tail[0].iov_base = p;
784 *p++ = 0; /* no more entries */
785 *p++ = htonl(resp->common.err == nfserr_eof);
786 rqstp->rq_res.tail[0].iov_len = 2<<2;
787 return 1;
788 } else
789 return xdr_ressize_check(rqstp, p);
790}
791
792static __be32 *
793encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
794 int namlen, u64 ino)
795{
796 *p++ = xdr_one; /* mark entry present */
797 p = xdr_encode_hyper(p, ino); /* file id */
798 p = xdr_encode_array(p, name, namlen);/* name length & name */
799
800 cd->offset = p; /* remember pointer */
801 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
802
803 return p;
804}
805
806static __be32
807compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
808 const char *name, int namlen)
809{
810 struct svc_export *exp;
811 struct dentry *dparent, *dchild;
812 __be32 rv = nfserr_noent;
813
814 dparent = cd->fh.fh_dentry;
815 exp = cd->fh.fh_export;
816
817 if (isdotent(name, namlen)) {
818 if (namlen == 2) {
819 dchild = dget_parent(dparent);
820 /* filesystem root - cannot return filehandle for ".." */
821 if (dchild == dparent)
822 goto out;
823 } else
824 dchild = dget(dparent);
825 } else
826 dchild = lookup_one_len(name, dparent, namlen);
827 if (IS_ERR(dchild))
828 return rv;
829 if (d_mountpoint(dchild))
830 goto out;
831 if (!dchild->d_inode)
832 goto out;
833 rv = fh_compose(fhp, exp, dchild, &cd->fh);
834out:
835 dput(dchild);
836 return rv;
837}
838
839static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen)
840{
841 struct svc_fh fh;
842 __be32 err;
843
844 fh_init(&fh, NFS3_FHSIZE);
845 err = compose_entry_fh(cd, &fh, name, namlen);
846 if (err) {
847 *p++ = 0;
848 *p++ = 0;
849 goto out;
850 }
851 p = encode_post_op_attr(cd->rqstp, p, &fh);
852 *p++ = xdr_one; /* yes, a file handle follows */
853 p = encode_fh(p, &fh);
854out:
855 fh_put(&fh);
856 return p;
857}
858
859/*
860 * Encode a directory entry. This one works for both normal readdir
861 * and readdirplus.
862 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
863 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
864 *
865 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
866 * file handle.
867 */
868
869#define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
870#define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
871static int
872encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
873 loff_t offset, u64 ino, unsigned int d_type, int plus)
874{
875 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
876 common);
877 __be32 *p = cd->buffer;
878 caddr_t curr_page_addr = NULL;
879 int pn; /* current page number */
880 int slen; /* string (name) length */
881 int elen; /* estimated entry length in words */
882 int num_entry_words = 0; /* actual number of words */
883
884 if (cd->offset) {
885 u64 offset64 = offset;
886
887 if (unlikely(cd->offset1)) {
888 /* we ended up with offset on a page boundary */
889 *cd->offset = htonl(offset64 >> 32);
890 *cd->offset1 = htonl(offset64 & 0xffffffff);
891 cd->offset1 = NULL;
892 } else {
893 xdr_encode_hyper(cd->offset, offset64);
894 }
895 }
896
897 /*
898 dprintk("encode_entry(%.*s @%ld%s)\n",
899 namlen, name, (long) offset, plus? " plus" : "");
900 */
901
902 /* truncate filename if too long */
903 if (namlen > NFS3_MAXNAMLEN)
904 namlen = NFS3_MAXNAMLEN;
905
906 slen = XDR_QUADLEN(namlen);
907 elen = slen + NFS3_ENTRY_BAGGAGE
908 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
909
910 if (cd->buflen < elen) {
911 cd->common.err = nfserr_toosmall;
912 return -EINVAL;
913 }
914
915 /* determine which page in rq_respages[] we are currently filling */
916 for (pn=1; pn < cd->rqstp->rq_resused; pn++) {
917 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
918
919 if (((caddr_t)cd->buffer >= curr_page_addr) &&
920 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
921 break;
922 }
923
924 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
925 /* encode entry in current page */
926
927 p = encode_entry_baggage(cd, p, name, namlen, ino);
928
929 if (plus)
930 p = encode_entryplus_baggage(cd, p, name, namlen);
931 num_entry_words = p - cd->buffer;
932 } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
933 /* temporarily encode entry into next page, then move back to
934 * current and next page in rq_respages[] */
935 __be32 *p1, *tmp;
936 int len1, len2;
937
938 /* grab next page for temporary storage of entry */
939 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
940
941 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
942
943 if (plus)
944 p1 = encode_entryplus_baggage(cd, p1, name, namlen);
945
946 /* determine entry word length and lengths to go in pages */
947 num_entry_words = p1 - tmp;
948 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
949 if ((num_entry_words << 2) < len1) {
950 /* the actual number of words in the entry is less
951 * than elen and can still fit in the current page
952 */
953 memmove(p, tmp, num_entry_words << 2);
954 p += num_entry_words;
955
956 /* update offset */
957 cd->offset = cd->buffer + (cd->offset - tmp);
958 } else {
959 unsigned int offset_r = (cd->offset - tmp) << 2;
960
961 /* update pointer to offset location.
962 * This is a 64bit quantity, so we need to
963 * deal with 3 cases:
964 * - entirely in first page
965 * - entirely in second page
966 * - 4 bytes in each page
967 */
968 if (offset_r + 8 <= len1) {
969 cd->offset = p + (cd->offset - tmp);
970 } else if (offset_r >= len1) {
971 cd->offset -= len1 >> 2;
972 } else {
973 /* sitting on the fence */
974 BUG_ON(offset_r != len1 - 4);
975 cd->offset = p + (cd->offset - tmp);
976 cd->offset1 = tmp;
977 }
978
979 len2 = (num_entry_words << 2) - len1;
980
981 /* move from temp page to current and next pages */
982 memmove(p, tmp, len1);
983 memmove(tmp, (caddr_t)tmp+len1, len2);
984
985 p = tmp + (len2 >> 2);
986 }
987 }
988 else {
989 cd->common.err = nfserr_toosmall;
990 return -EINVAL;
991 }
992
993 cd->buflen -= num_entry_words;
994 cd->buffer = p;
995 cd->common.err = nfs_ok;
996 return 0;
997
998}
999
1000int
1001nfs3svc_encode_entry(void *cd, const char *name,
1002 int namlen, loff_t offset, u64 ino, unsigned int d_type)
1003{
1004 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1005}
1006
1007int
1008nfs3svc_encode_entry_plus(void *cd, const char *name,
1009 int namlen, loff_t offset, u64 ino,
1010 unsigned int d_type)
1011{
1012 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1013}
1014
1015/* FSSTAT */
1016int
1017nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1018 struct nfsd3_fsstatres *resp)
1019{
1020 struct kstatfs *s = &resp->stats;
1021 u64 bs = s->f_bsize;
1022
1023 *p++ = xdr_zero; /* no post_op_attr */
1024
1025 if (resp->status == 0) {
1026 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1027 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1028 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1029 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1030 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1031 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1032 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1033 }
1034 return xdr_ressize_check(rqstp, p);
1035}
1036
1037/* FSINFO */
1038int
1039nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1040 struct nfsd3_fsinfores *resp)
1041{
1042 *p++ = xdr_zero; /* no post_op_attr */
1043
1044 if (resp->status == 0) {
1045 *p++ = htonl(resp->f_rtmax);
1046 *p++ = htonl(resp->f_rtpref);
1047 *p++ = htonl(resp->f_rtmult);
1048 *p++ = htonl(resp->f_wtmax);
1049 *p++ = htonl(resp->f_wtpref);
1050 *p++ = htonl(resp->f_wtmult);
1051 *p++ = htonl(resp->f_dtpref);
1052 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1053 *p++ = xdr_one;
1054 *p++ = xdr_zero;
1055 *p++ = htonl(resp->f_properties);
1056 }
1057
1058 return xdr_ressize_check(rqstp, p);
1059}
1060
1061/* PATHCONF */
1062int
1063nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1064 struct nfsd3_pathconfres *resp)
1065{
1066 *p++ = xdr_zero; /* no post_op_attr */
1067
1068 if (resp->status == 0) {
1069 *p++ = htonl(resp->p_link_max);
1070 *p++ = htonl(resp->p_name_max);
1071 *p++ = htonl(resp->p_no_trunc);
1072 *p++ = htonl(resp->p_chown_restricted);
1073 *p++ = htonl(resp->p_case_insensitive);
1074 *p++ = htonl(resp->p_case_preserving);
1075 }
1076
1077 return xdr_ressize_check(rqstp, p);
1078}
1079
1080/* COMMIT */
1081int
1082nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1083 struct nfsd3_commitres *resp)
1084{
1085 p = encode_wcc_data(rqstp, p, &resp->fh);
1086 /* Write verifier */
1087 if (resp->status == 0) {
1088 *p++ = htonl(nfssvc_boot.tv_sec);
1089 *p++ = htonl(nfssvc_boot.tv_usec);
1090 }
1091 return xdr_ressize_check(rqstp, p);
1092}
1093
1094/*
1095 * XDR release functions
1096 */
1097int
1098nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1099 struct nfsd3_attrstat *resp)
1100{
1101 fh_put(&resp->fh);
1102 return 1;
1103}
1104
1105int
1106nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
1107 struct nfsd3_fhandle_pair *resp)
1108{
1109 fh_put(&resp->fh1);
1110 fh_put(&resp->fh2);
1111 return 1;
1112}
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 */
22static 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 */
32static __be32 *
33encode_time3(__be32 *p, struct timespec *time)
34{
35 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
36 return p;
37}
38
39static __be32 *
40decode_time3(__be32 *p, struct timespec *time)
41{
42 time->tv_sec = ntohl(*p++);
43 time->tv_nsec = ntohl(*p++);
44 return p;
45}
46
47static __be32 *
48decode_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
67static __be32 *
68encode_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 */
81static __be32 *
82decode_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
97static __be32 *
98decode_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 iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
124 }
125 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
126 iap->ia_valid |= ATTR_ATIME;
127 } else if (tmp == 2) { /* set to client time */
128 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
129 iap->ia_atime.tv_sec = ntohl(*p++);
130 iap->ia_atime.tv_nsec = ntohl(*p++);
131 }
132 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
133 iap->ia_valid |= ATTR_MTIME;
134 } else if (tmp == 2) { /* set to client time */
135 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
136 iap->ia_mtime.tv_sec = ntohl(*p++);
137 iap->ia_mtime.tv_nsec = ntohl(*p++);
138 }
139 return p;
140}
141
142static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
143{
144 u64 f;
145 switch(fsid_source(fhp)) {
146 default:
147 case FSIDSOURCE_DEV:
148 p = xdr_encode_hyper(p, (u64)huge_encode_dev
149 (d_inode(fhp->fh_dentry)->i_sb->s_dev));
150 break;
151 case FSIDSOURCE_FSID:
152 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
153 break;
154 case FSIDSOURCE_UUID:
155 f = ((u64*)fhp->fh_export->ex_uuid)[0];
156 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
157 p = xdr_encode_hyper(p, f);
158 break;
159 }
160 return p;
161}
162
163static __be32 *
164encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
165 struct kstat *stat)
166{
167 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
168 *p++ = htonl((u32) (stat->mode & S_IALLUGO));
169 *p++ = htonl((u32) stat->nlink);
170 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
171 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
172 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
173 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
174 } else {
175 p = xdr_encode_hyper(p, (u64) stat->size);
176 }
177 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
178 *p++ = htonl((u32) MAJOR(stat->rdev));
179 *p++ = htonl((u32) MINOR(stat->rdev));
180 p = encode_fsid(p, fhp);
181 p = xdr_encode_hyper(p, stat->ino);
182 p = encode_time3(p, &stat->atime);
183 p = encode_time3(p, &stat->mtime);
184 p = encode_time3(p, &stat->ctime);
185
186 return p;
187}
188
189static __be32 *
190encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
191{
192 /* Attributes to follow */
193 *p++ = xdr_one;
194 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
195}
196
197/*
198 * Encode post-operation attributes.
199 * The inode may be NULL if the call failed because of a stale file
200 * handle. In this case, no attributes are returned.
201 */
202static __be32 *
203encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
204{
205 struct dentry *dentry = fhp->fh_dentry;
206 if (dentry && d_really_is_positive(dentry)) {
207 __be32 err;
208 struct kstat stat;
209
210 err = fh_getattr(fhp, &stat);
211 if (!err) {
212 *p++ = xdr_one; /* attributes follow */
213 lease_get_mtime(d_inode(dentry), &stat.mtime);
214 return encode_fattr3(rqstp, p, fhp, &stat);
215 }
216 }
217 *p++ = xdr_zero;
218 return p;
219}
220
221/* Helper for NFSv3 ACLs */
222__be32 *
223nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
224{
225 return encode_post_op_attr(rqstp, p, fhp);
226}
227
228/*
229 * Enocde weak cache consistency data
230 */
231static __be32 *
232encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
233{
234 struct dentry *dentry = fhp->fh_dentry;
235
236 if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
237 if (fhp->fh_pre_saved) {
238 *p++ = xdr_one;
239 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
240 p = encode_time3(p, &fhp->fh_pre_mtime);
241 p = encode_time3(p, &fhp->fh_pre_ctime);
242 } else {
243 *p++ = xdr_zero;
244 }
245 return encode_saved_post_attr(rqstp, p, fhp);
246 }
247 /* no pre- or post-attrs */
248 *p++ = xdr_zero;
249 return encode_post_op_attr(rqstp, p, fhp);
250}
251
252/*
253 * Fill in the post_op attr for the wcc data
254 */
255void fill_post_wcc(struct svc_fh *fhp)
256{
257 __be32 err;
258
259 if (fhp->fh_post_saved)
260 printk("nfsd: inode locked twice during operation.\n");
261
262 err = fh_getattr(fhp, &fhp->fh_post_attr);
263 fhp->fh_post_change = d_inode(fhp->fh_dentry)->i_version;
264 if (err) {
265 fhp->fh_post_saved = false;
266 /* Grab the ctime anyway - set_change_info might use it */
267 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
268 } else
269 fhp->fh_post_saved = true;
270}
271
272/*
273 * XDR decode functions
274 */
275int
276nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
277{
278 p = decode_fh(p, &args->fh);
279 if (!p)
280 return 0;
281 return xdr_argsize_check(rqstp, p);
282}
283
284int
285nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
286 struct nfsd3_sattrargs *args)
287{
288 p = decode_fh(p, &args->fh);
289 if (!p)
290 return 0;
291 p = decode_sattr3(p, &args->attrs);
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
302int
303nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *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
313int
314nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
315 struct nfsd3_accessargs *args)
316{
317 p = decode_fh(p, &args->fh);
318 if (!p)
319 return 0;
320 args->access = ntohl(*p++);
321
322 return xdr_argsize_check(rqstp, p);
323}
324
325int
326nfs3svc_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 p = decode_fh(p, &args->fh);
334 if (!p)
335 return 0;
336 p = xdr_decode_hyper(p, &args->offset);
337
338 args->count = ntohl(*p++);
339 len = min(args->count, max_blocksize);
340
341 /* set up the kvec */
342 v=0;
343 while (len > 0) {
344 struct page *p = *(rqstp->rq_next_page++);
345
346 rqstp->rq_vec[v].iov_base = page_address(p);
347 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
348 len -= rqstp->rq_vec[v].iov_len;
349 v++;
350 }
351 args->vlen = v;
352 return xdr_argsize_check(rqstp, p);
353}
354
355int
356nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
357 struct nfsd3_writeargs *args)
358{
359 unsigned int len, v, hdr, dlen;
360 u32 max_blocksize = svc_max_payload(rqstp);
361
362 p = decode_fh(p, &args->fh);
363 if (!p)
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
412int
413nfs3svc_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}
435int
436nfs3svc_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
447int
448nfs3svc_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 = min_t(unsigned int, rqstp->rq_arg.page_len, PAGE_SIZE);
483 old = page_address(rqstp->rq_arg.pages[0]);
484 }
485 while (len && avail && *old) {
486 *new++ = *old++;
487 len--;
488 avail--;
489 }
490 *new = '\0';
491 if (len)
492 return 0;
493
494 return 1;
495}
496
497int
498nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
499 struct nfsd3_mknodargs *args)
500{
501 if (!(p = decode_fh(p, &args->fh))
502 || !(p = decode_filename(p, &args->name, &args->len)))
503 return 0;
504
505 args->ftype = ntohl(*p++);
506
507 if (args->ftype == NF3BLK || args->ftype == NF3CHR
508 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
509 p = decode_sattr3(p, &args->attrs);
510
511 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
512 args->major = ntohl(*p++);
513 args->minor = ntohl(*p++);
514 }
515
516 return xdr_argsize_check(rqstp, p);
517}
518
519int
520nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
521 struct nfsd3_renameargs *args)
522{
523 if (!(p = decode_fh(p, &args->ffh))
524 || !(p = decode_filename(p, &args->fname, &args->flen))
525 || !(p = decode_fh(p, &args->tfh))
526 || !(p = decode_filename(p, &args->tname, &args->tlen)))
527 return 0;
528
529 return xdr_argsize_check(rqstp, p);
530}
531
532int
533nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
534 struct nfsd3_readlinkargs *args)
535{
536 p = decode_fh(p, &args->fh);
537 if (!p)
538 return 0;
539 args->buffer = page_address(*(rqstp->rq_next_page++));
540
541 return xdr_argsize_check(rqstp, p);
542}
543
544int
545nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
546 struct nfsd3_linkargs *args)
547{
548 if (!(p = decode_fh(p, &args->ffh))
549 || !(p = decode_fh(p, &args->tfh))
550 || !(p = decode_filename(p, &args->tname, &args->tlen)))
551 return 0;
552
553 return xdr_argsize_check(rqstp, p);
554}
555
556int
557nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
558 struct nfsd3_readdirargs *args)
559{
560 p = decode_fh(p, &args->fh);
561 if (!p)
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 args->count = min_t(u32, args->count, PAGE_SIZE);
568 args->buffer = page_address(*(rqstp->rq_next_page++));
569
570 return xdr_argsize_check(rqstp, p);
571}
572
573int
574nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
575 struct nfsd3_readdirargs *args)
576{
577 int len;
578 u32 max_blocksize = svc_max_payload(rqstp);
579
580 p = decode_fh(p, &args->fh);
581 if (!p)
582 return 0;
583 p = xdr_decode_hyper(p, &args->cookie);
584 args->verf = p; p += 2;
585 args->dircount = ntohl(*p++);
586 args->count = ntohl(*p++);
587
588 len = args->count = min(args->count, max_blocksize);
589 while (len > 0) {
590 struct page *p = *(rqstp->rq_next_page++);
591 if (!args->buffer)
592 args->buffer = page_address(p);
593 len -= PAGE_SIZE;
594 }
595
596 return xdr_argsize_check(rqstp, p);
597}
598
599int
600nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
601 struct nfsd3_commitargs *args)
602{
603 p = decode_fh(p, &args->fh);
604 if (!p)
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 */
619int
620nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
621{
622 return xdr_ressize_check(rqstp, p);
623}
624
625/* GETATTR */
626int
627nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
628 struct nfsd3_attrstat *resp)
629{
630 if (resp->status == 0) {
631 lease_get_mtime(d_inode(resp->fh.fh_dentry),
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 */
639int
640nfs3svc_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 */
648int
649nfs3svc_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 */
661int
662nfs3svc_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 */
672int
673nfs3svc_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 */
693int
694nfs3svc_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 as well */
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 */
717int
718nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
719 struct nfsd3_writeres *resp)
720{
721 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
722
723 p = encode_wcc_data(rqstp, p, &resp->fh);
724 if (resp->status == 0) {
725 *p++ = htonl(resp->count);
726 *p++ = htonl(resp->committed);
727 *p++ = htonl(nn->nfssvc_boot.tv_sec);
728 *p++ = htonl(nn->nfssvc_boot.tv_usec);
729 }
730 return xdr_ressize_check(rqstp, p);
731}
732
733/* CREATE, MKDIR, SYMLINK, MKNOD */
734int
735nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
736 struct nfsd3_diropres *resp)
737{
738 if (resp->status == 0) {
739 *p++ = xdr_one;
740 p = encode_fh(p, &resp->fh);
741 p = encode_post_op_attr(rqstp, p, &resp->fh);
742 }
743 p = encode_wcc_data(rqstp, p, &resp->dirfh);
744 return xdr_ressize_check(rqstp, p);
745}
746
747/* RENAME */
748int
749nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
750 struct nfsd3_renameres *resp)
751{
752 p = encode_wcc_data(rqstp, p, &resp->ffh);
753 p = encode_wcc_data(rqstp, p, &resp->tfh);
754 return xdr_ressize_check(rqstp, p);
755}
756
757/* LINK */
758int
759nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
760 struct nfsd3_linkres *resp)
761{
762 p = encode_post_op_attr(rqstp, p, &resp->fh);
763 p = encode_wcc_data(rqstp, p, &resp->tfh);
764 return xdr_ressize_check(rqstp, p);
765}
766
767/* READDIR */
768int
769nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
770 struct nfsd3_readdirres *resp)
771{
772 p = encode_post_op_attr(rqstp, p, &resp->fh);
773
774 if (resp->status == 0) {
775 /* stupid readdir cookie */
776 memcpy(p, resp->verf, 8); p += 2;
777 xdr_ressize_check(rqstp, p);
778 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
779 return 1; /*No room for trailer */
780 rqstp->rq_res.page_len = (resp->count) << 2;
781
782 /* add the 'tail' to the end of the 'head' page - page 0. */
783 rqstp->rq_res.tail[0].iov_base = p;
784 *p++ = 0; /* no more entries */
785 *p++ = htonl(resp->common.err == nfserr_eof);
786 rqstp->rq_res.tail[0].iov_len = 2<<2;
787 return 1;
788 } else
789 return xdr_ressize_check(rqstp, p);
790}
791
792static __be32 *
793encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
794 int namlen, u64 ino)
795{
796 *p++ = xdr_one; /* mark entry present */
797 p = xdr_encode_hyper(p, ino); /* file id */
798 p = xdr_encode_array(p, name, namlen);/* name length & name */
799
800 cd->offset = p; /* remember pointer */
801 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
802
803 return p;
804}
805
806static __be32
807compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
808 const char *name, int namlen, u64 ino)
809{
810 struct svc_export *exp;
811 struct dentry *dparent, *dchild;
812 __be32 rv = nfserr_noent;
813
814 dparent = cd->fh.fh_dentry;
815 exp = cd->fh.fh_export;
816
817 if (isdotent(name, namlen)) {
818 if (namlen == 2) {
819 dchild = dget_parent(dparent);
820 /* filesystem root - cannot return filehandle for ".." */
821 if (dchild == dparent)
822 goto out;
823 } else
824 dchild = dget(dparent);
825 } else
826 dchild = lookup_one_len_unlocked(name, dparent, namlen);
827 if (IS_ERR(dchild))
828 return rv;
829 if (d_mountpoint(dchild))
830 goto out;
831 if (d_really_is_negative(dchild))
832 goto out;
833 if (dchild->d_inode->i_ino != ino)
834 goto out;
835 rv = fh_compose(fhp, exp, dchild, &cd->fh);
836out:
837 dput(dchild);
838 return rv;
839}
840
841static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
842{
843 struct svc_fh *fh = &cd->scratch;
844 __be32 err;
845
846 fh_init(fh, NFS3_FHSIZE);
847 err = compose_entry_fh(cd, fh, name, namlen, ino);
848 if (err) {
849 *p++ = 0;
850 *p++ = 0;
851 goto out;
852 }
853 p = encode_post_op_attr(cd->rqstp, p, fh);
854 *p++ = xdr_one; /* yes, a file handle follows */
855 p = encode_fh(p, fh);
856out:
857 fh_put(fh);
858 return p;
859}
860
861/*
862 * Encode a directory entry. This one works for both normal readdir
863 * and readdirplus.
864 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
865 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
866 *
867 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
868 * file handle.
869 */
870
871#define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
872#define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
873static int
874encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
875 loff_t offset, u64 ino, unsigned int d_type, int plus)
876{
877 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
878 common);
879 __be32 *p = cd->buffer;
880 caddr_t curr_page_addr = NULL;
881 struct page ** page;
882 int slen; /* string (name) length */
883 int elen; /* estimated entry length in words */
884 int num_entry_words = 0; /* actual number of words */
885
886 if (cd->offset) {
887 u64 offset64 = offset;
888
889 if (unlikely(cd->offset1)) {
890 /* we ended up with offset on a page boundary */
891 *cd->offset = htonl(offset64 >> 32);
892 *cd->offset1 = htonl(offset64 & 0xffffffff);
893 cd->offset1 = NULL;
894 } else {
895 xdr_encode_hyper(cd->offset, offset64);
896 }
897 }
898
899 /*
900 dprintk("encode_entry(%.*s @%ld%s)\n",
901 namlen, name, (long) offset, plus? " plus" : "");
902 */
903
904 /* truncate filename if too long */
905 namlen = min(namlen, NFS3_MAXNAMLEN);
906
907 slen = XDR_QUADLEN(namlen);
908 elen = slen + NFS3_ENTRY_BAGGAGE
909 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
910
911 if (cd->buflen < elen) {
912 cd->common.err = nfserr_toosmall;
913 return -EINVAL;
914 }
915
916 /* determine which page in rq_respages[] we are currently filling */
917 for (page = cd->rqstp->rq_respages + 1;
918 page < cd->rqstp->rq_next_page; page++) {
919 curr_page_addr = page_address(*page);
920
921 if (((caddr_t)cd->buffer >= curr_page_addr) &&
922 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
923 break;
924 }
925
926 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
927 /* encode entry in current page */
928
929 p = encode_entry_baggage(cd, p, name, namlen, ino);
930
931 if (plus)
932 p = encode_entryplus_baggage(cd, p, name, namlen, ino);
933 num_entry_words = p - cd->buffer;
934 } else if (*(page+1) != NULL) {
935 /* temporarily encode entry into next page, then move back to
936 * current and next page in rq_respages[] */
937 __be32 *p1, *tmp;
938 int len1, len2;
939
940 /* grab next page for temporary storage of entry */
941 p1 = tmp = page_address(*(page+1));
942
943 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
944
945 if (plus)
946 p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
947
948 /* determine entry word length and lengths to go in pages */
949 num_entry_words = p1 - tmp;
950 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
951 if ((num_entry_words << 2) < len1) {
952 /* the actual number of words in the entry is less
953 * than elen and can still fit in the current page
954 */
955 memmove(p, tmp, num_entry_words << 2);
956 p += num_entry_words;
957
958 /* update offset */
959 cd->offset = cd->buffer + (cd->offset - tmp);
960 } else {
961 unsigned int offset_r = (cd->offset - tmp) << 2;
962
963 /* update pointer to offset location.
964 * This is a 64bit quantity, so we need to
965 * deal with 3 cases:
966 * - entirely in first page
967 * - entirely in second page
968 * - 4 bytes in each page
969 */
970 if (offset_r + 8 <= len1) {
971 cd->offset = p + (cd->offset - tmp);
972 } else if (offset_r >= len1) {
973 cd->offset -= len1 >> 2;
974 } else {
975 /* sitting on the fence */
976 BUG_ON(offset_r != len1 - 4);
977 cd->offset = p + (cd->offset - tmp);
978 cd->offset1 = tmp;
979 }
980
981 len2 = (num_entry_words << 2) - len1;
982
983 /* move from temp page to current and next pages */
984 memmove(p, tmp, len1);
985 memmove(tmp, (caddr_t)tmp+len1, len2);
986
987 p = tmp + (len2 >> 2);
988 }
989 }
990 else {
991 cd->common.err = nfserr_toosmall;
992 return -EINVAL;
993 }
994
995 cd->buflen -= num_entry_words;
996 cd->buffer = p;
997 cd->common.err = nfs_ok;
998 return 0;
999
1000}
1001
1002int
1003nfs3svc_encode_entry(void *cd, const char *name,
1004 int namlen, loff_t offset, u64 ino, unsigned int d_type)
1005{
1006 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1007}
1008
1009int
1010nfs3svc_encode_entry_plus(void *cd, const char *name,
1011 int namlen, loff_t offset, u64 ino,
1012 unsigned int d_type)
1013{
1014 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1015}
1016
1017/* FSSTAT */
1018int
1019nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1020 struct nfsd3_fsstatres *resp)
1021{
1022 struct kstatfs *s = &resp->stats;
1023 u64 bs = s->f_bsize;
1024
1025 *p++ = xdr_zero; /* no post_op_attr */
1026
1027 if (resp->status == 0) {
1028 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1029 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1030 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1031 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1032 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1033 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1034 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1035 }
1036 return xdr_ressize_check(rqstp, p);
1037}
1038
1039/* FSINFO */
1040int
1041nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1042 struct nfsd3_fsinfores *resp)
1043{
1044 *p++ = xdr_zero; /* no post_op_attr */
1045
1046 if (resp->status == 0) {
1047 *p++ = htonl(resp->f_rtmax);
1048 *p++ = htonl(resp->f_rtpref);
1049 *p++ = htonl(resp->f_rtmult);
1050 *p++ = htonl(resp->f_wtmax);
1051 *p++ = htonl(resp->f_wtpref);
1052 *p++ = htonl(resp->f_wtmult);
1053 *p++ = htonl(resp->f_dtpref);
1054 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1055 *p++ = xdr_one;
1056 *p++ = xdr_zero;
1057 *p++ = htonl(resp->f_properties);
1058 }
1059
1060 return xdr_ressize_check(rqstp, p);
1061}
1062
1063/* PATHCONF */
1064int
1065nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1066 struct nfsd3_pathconfres *resp)
1067{
1068 *p++ = xdr_zero; /* no post_op_attr */
1069
1070 if (resp->status == 0) {
1071 *p++ = htonl(resp->p_link_max);
1072 *p++ = htonl(resp->p_name_max);
1073 *p++ = htonl(resp->p_no_trunc);
1074 *p++ = htonl(resp->p_chown_restricted);
1075 *p++ = htonl(resp->p_case_insensitive);
1076 *p++ = htonl(resp->p_case_preserving);
1077 }
1078
1079 return xdr_ressize_check(rqstp, p);
1080}
1081
1082/* COMMIT */
1083int
1084nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1085 struct nfsd3_commitres *resp)
1086{
1087 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1088
1089 p = encode_wcc_data(rqstp, p, &resp->fh);
1090 /* Write verifier */
1091 if (resp->status == 0) {
1092 *p++ = htonl(nn->nfssvc_boot.tv_sec);
1093 *p++ = htonl(nn->nfssvc_boot.tv_usec);
1094 }
1095 return xdr_ressize_check(rqstp, p);
1096}
1097
1098/*
1099 * XDR release functions
1100 */
1101int
1102nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1103 struct nfsd3_attrstat *resp)
1104{
1105 fh_put(&resp->fh);
1106 return 1;
1107}
1108
1109int
1110nfs3svc_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}