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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// SPDX-License-Identifier: GPL-2.0
2/*
3 * XDR support for nfsd/protocol version 3.
4 *
5 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
6 *
7 * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
8 */
9
10#include <linux/namei.h>
11#include <linux/sunrpc/svc_xprt.h>
12#include "xdr3.h"
13#include "auth.h"
14#include "netns.h"
15#include "vfs.h"
16
17#define NFSDDBG_FACILITY NFSDDBG_XDR
18
19
20/*
21 * Mapping of S_IF* types to NFS file types
22 */
23static u32 nfs3_ftypes[] = {
24 NF3NON, NF3FIFO, NF3CHR, NF3BAD,
25 NF3DIR, NF3BAD, NF3BLK, NF3BAD,
26 NF3REG, NF3BAD, NF3LNK, NF3BAD,
27 NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
28};
29
30
31/*
32 * XDR functions for basic NFS types
33 */
34static __be32 *
35encode_time3(__be32 *p, struct timespec *time)
36{
37 *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
38 return p;
39}
40
41static __be32 *
42decode_time3(__be32 *p, struct timespec *time)
43{
44 time->tv_sec = ntohl(*p++);
45 time->tv_nsec = ntohl(*p++);
46 return p;
47}
48
49static __be32 *
50decode_fh(__be32 *p, struct svc_fh *fhp)
51{
52 unsigned int size;
53 fh_init(fhp, NFS3_FHSIZE);
54 size = ntohl(*p++);
55 if (size > NFS3_FHSIZE)
56 return NULL;
57
58 memcpy(&fhp->fh_handle.fh_base, p, size);
59 fhp->fh_handle.fh_size = size;
60 return p + XDR_QUADLEN(size);
61}
62
63/* Helper function for NFSv3 ACL code */
64__be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
65{
66 return decode_fh(p, fhp);
67}
68
69static __be32 *
70encode_fh(__be32 *p, struct svc_fh *fhp)
71{
72 unsigned int size = fhp->fh_handle.fh_size;
73 *p++ = htonl(size);
74 if (size) p[XDR_QUADLEN(size)-1]=0;
75 memcpy(p, &fhp->fh_handle.fh_base, size);
76 return p + XDR_QUADLEN(size);
77}
78
79/*
80 * Decode a file name and make sure that the path contains
81 * no slashes or null bytes.
82 */
83static __be32 *
84decode_filename(__be32 *p, char **namp, unsigned int *lenp)
85{
86 char *name;
87 unsigned int i;
88
89 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
90 for (i = 0, name = *namp; i < *lenp; i++, name++) {
91 if (*name == '\0' || *name == '/')
92 return NULL;
93 }
94 }
95
96 return p;
97}
98
99static __be32 *
100decode_sattr3(__be32 *p, struct iattr *iap, struct user_namespace *userns)
101{
102 u32 tmp;
103
104 iap->ia_valid = 0;
105
106 if (*p++) {
107 iap->ia_valid |= ATTR_MODE;
108 iap->ia_mode = ntohl(*p++);
109 }
110 if (*p++) {
111 iap->ia_uid = make_kuid(userns, ntohl(*p++));
112 if (uid_valid(iap->ia_uid))
113 iap->ia_valid |= ATTR_UID;
114 }
115 if (*p++) {
116 iap->ia_gid = make_kgid(userns, ntohl(*p++));
117 if (gid_valid(iap->ia_gid))
118 iap->ia_valid |= ATTR_GID;
119 }
120 if (*p++) {
121 u64 newsize;
122
123 iap->ia_valid |= ATTR_SIZE;
124 p = xdr_decode_hyper(p, &newsize);
125 iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
126 }
127 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
128 iap->ia_valid |= ATTR_ATIME;
129 } else if (tmp == 2) { /* set to client time */
130 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
131 iap->ia_atime.tv_sec = ntohl(*p++);
132 iap->ia_atime.tv_nsec = ntohl(*p++);
133 }
134 if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
135 iap->ia_valid |= ATTR_MTIME;
136 } else if (tmp == 2) { /* set to client time */
137 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
138 iap->ia_mtime.tv_sec = ntohl(*p++);
139 iap->ia_mtime.tv_nsec = ntohl(*p++);
140 }
141 return p;
142}
143
144static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
145{
146 u64 f;
147 switch(fsid_source(fhp)) {
148 default:
149 case FSIDSOURCE_DEV:
150 p = xdr_encode_hyper(p, (u64)huge_encode_dev
151 (fhp->fh_dentry->d_sb->s_dev));
152 break;
153 case FSIDSOURCE_FSID:
154 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
155 break;
156 case FSIDSOURCE_UUID:
157 f = ((u64*)fhp->fh_export->ex_uuid)[0];
158 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
159 p = xdr_encode_hyper(p, f);
160 break;
161 }
162 return p;
163}
164
165static __be32 *
166encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
167 struct kstat *stat)
168{
169 struct user_namespace *userns = nfsd_user_namespace(rqstp);
170 struct timespec ts;
171 *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
172 *p++ = htonl((u32) (stat->mode & S_IALLUGO));
173 *p++ = htonl((u32) stat->nlink);
174 *p++ = htonl((u32) from_kuid_munged(userns, stat->uid));
175 *p++ = htonl((u32) from_kgid_munged(userns, stat->gid));
176 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
177 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
178 } else {
179 p = xdr_encode_hyper(p, (u64) stat->size);
180 }
181 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
182 *p++ = htonl((u32) MAJOR(stat->rdev));
183 *p++ = htonl((u32) MINOR(stat->rdev));
184 p = encode_fsid(p, fhp);
185 p = xdr_encode_hyper(p, stat->ino);
186 ts = timespec64_to_timespec(stat->atime);
187 p = encode_time3(p, &ts);
188 ts = timespec64_to_timespec(stat->mtime);
189 p = encode_time3(p, &ts);
190 ts = timespec64_to_timespec(stat->ctime);
191 p = encode_time3(p, &ts);
192
193 return p;
194}
195
196static __be32 *
197encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
198{
199 /* Attributes to follow */
200 *p++ = xdr_one;
201 return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
202}
203
204/*
205 * Encode post-operation attributes.
206 * The inode may be NULL if the call failed because of a stale file
207 * handle. In this case, no attributes are returned.
208 */
209static __be32 *
210encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
211{
212 struct dentry *dentry = fhp->fh_dentry;
213 if (dentry && d_really_is_positive(dentry)) {
214 __be32 err;
215 struct kstat stat;
216
217 err = fh_getattr(fhp, &stat);
218 if (!err) {
219 *p++ = xdr_one; /* attributes follow */
220 lease_get_mtime(d_inode(dentry), &stat.mtime);
221 return encode_fattr3(rqstp, p, fhp, &stat);
222 }
223 }
224 *p++ = xdr_zero;
225 return p;
226}
227
228/* Helper for NFSv3 ACLs */
229__be32 *
230nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
231{
232 return encode_post_op_attr(rqstp, p, fhp);
233}
234
235/*
236 * Enocde weak cache consistency data
237 */
238static __be32 *
239encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
240{
241 struct dentry *dentry = fhp->fh_dentry;
242
243 if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) {
244 if (fhp->fh_pre_saved) {
245 *p++ = xdr_one;
246 p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
247 p = encode_time3(p, &fhp->fh_pre_mtime);
248 p = encode_time3(p, &fhp->fh_pre_ctime);
249 } else {
250 *p++ = xdr_zero;
251 }
252 return encode_saved_post_attr(rqstp, p, fhp);
253 }
254 /* no pre- or post-attrs */
255 *p++ = xdr_zero;
256 return encode_post_op_attr(rqstp, p, fhp);
257}
258
259/*
260 * Fill in the pre_op attr for the wcc data
261 */
262void fill_pre_wcc(struct svc_fh *fhp)
263{
264 struct inode *inode;
265 struct kstat stat;
266 __be32 err;
267
268 if (fhp->fh_pre_saved)
269 return;
270
271 inode = d_inode(fhp->fh_dentry);
272 err = fh_getattr(fhp, &stat);
273 if (err) {
274 /* Grab the times from inode anyway */
275 stat.mtime = inode->i_mtime;
276 stat.ctime = inode->i_ctime;
277 stat.size = inode->i_size;
278 }
279
280 fhp->fh_pre_mtime = timespec64_to_timespec(stat.mtime);
281 fhp->fh_pre_ctime = timespec64_to_timespec(stat.ctime);
282 fhp->fh_pre_size = stat.size;
283 fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode);
284 fhp->fh_pre_saved = true;
285}
286
287/*
288 * Fill in the post_op attr for the wcc data
289 */
290void fill_post_wcc(struct svc_fh *fhp)
291{
292 __be32 err;
293
294 if (fhp->fh_post_saved)
295 printk("nfsd: inode locked twice during operation.\n");
296
297 err = fh_getattr(fhp, &fhp->fh_post_attr);
298 fhp->fh_post_change = nfsd4_change_attribute(&fhp->fh_post_attr,
299 d_inode(fhp->fh_dentry));
300 if (err) {
301 fhp->fh_post_saved = false;
302 /* Grab the ctime anyway - set_change_info might use it */
303 fhp->fh_post_attr.ctime = d_inode(fhp->fh_dentry)->i_ctime;
304 } else
305 fhp->fh_post_saved = true;
306}
307
308/*
309 * XDR decode functions
310 */
311int
312nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
313{
314 struct nfsd_fhandle *args = rqstp->rq_argp;
315
316 p = decode_fh(p, &args->fh);
317 if (!p)
318 return 0;
319 return xdr_argsize_check(rqstp, p);
320}
321
322int
323nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
324{
325 struct nfsd3_sattrargs *args = rqstp->rq_argp;
326
327 p = decode_fh(p, &args->fh);
328 if (!p)
329 return 0;
330 p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
331
332 if ((args->check_guard = ntohl(*p++)) != 0) {
333 struct timespec time;
334 p = decode_time3(p, &time);
335 args->guardtime = time.tv_sec;
336 }
337
338 return xdr_argsize_check(rqstp, p);
339}
340
341int
342nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
343{
344 struct nfsd3_diropargs *args = rqstp->rq_argp;
345
346 if (!(p = decode_fh(p, &args->fh))
347 || !(p = decode_filename(p, &args->name, &args->len)))
348 return 0;
349
350 return xdr_argsize_check(rqstp, p);
351}
352
353int
354nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
355{
356 struct nfsd3_accessargs *args = rqstp->rq_argp;
357
358 p = decode_fh(p, &args->fh);
359 if (!p)
360 return 0;
361 args->access = ntohl(*p++);
362
363 return xdr_argsize_check(rqstp, p);
364}
365
366int
367nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
368{
369 struct nfsd3_readargs *args = rqstp->rq_argp;
370 unsigned int len;
371 int v;
372 u32 max_blocksize = svc_max_payload(rqstp);
373
374 p = decode_fh(p, &args->fh);
375 if (!p)
376 return 0;
377 p = xdr_decode_hyper(p, &args->offset);
378
379 args->count = ntohl(*p++);
380 len = min(args->count, max_blocksize);
381
382 /* set up the kvec */
383 v=0;
384 while (len > 0) {
385 struct page *p = *(rqstp->rq_next_page++);
386
387 rqstp->rq_vec[v].iov_base = page_address(p);
388 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
389 len -= rqstp->rq_vec[v].iov_len;
390 v++;
391 }
392 args->vlen = v;
393 return xdr_argsize_check(rqstp, p);
394}
395
396int
397nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
398{
399 struct nfsd3_writeargs *args = rqstp->rq_argp;
400 unsigned int len, hdr, dlen;
401 u32 max_blocksize = svc_max_payload(rqstp);
402 struct kvec *head = rqstp->rq_arg.head;
403 struct kvec *tail = rqstp->rq_arg.tail;
404
405 p = decode_fh(p, &args->fh);
406 if (!p)
407 return 0;
408 p = xdr_decode_hyper(p, &args->offset);
409
410 args->count = ntohl(*p++);
411 args->stable = ntohl(*p++);
412 len = args->len = ntohl(*p++);
413 if ((void *)p > head->iov_base + head->iov_len)
414 return 0;
415 /*
416 * The count must equal the amount of data passed.
417 */
418 if (args->count != args->len)
419 return 0;
420
421 /*
422 * Check to make sure that we got the right number of
423 * bytes.
424 */
425 hdr = (void*)p - head->iov_base;
426 dlen = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len - hdr;
427 /*
428 * Round the length of the data which was specified up to
429 * the next multiple of XDR units and then compare that
430 * against the length which was actually received.
431 * Note that when RPCSEC/GSS (for example) is used, the
432 * data buffer can be padded so dlen might be larger
433 * than required. It must never be smaller.
434 */
435 if (dlen < XDR_QUADLEN(len)*4)
436 return 0;
437
438 if (args->count > max_blocksize) {
439 args->count = max_blocksize;
440 len = args->len = max_blocksize;
441 }
442
443 args->first.iov_base = (void *)p;
444 args->first.iov_len = head->iov_len - hdr;
445 return 1;
446}
447
448int
449nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
450{
451 struct nfsd3_createargs *args = rqstp->rq_argp;
452
453 if (!(p = decode_fh(p, &args->fh))
454 || !(p = decode_filename(p, &args->name, &args->len)))
455 return 0;
456
457 switch (args->createmode = ntohl(*p++)) {
458 case NFS3_CREATE_UNCHECKED:
459 case NFS3_CREATE_GUARDED:
460 p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
461 break;
462 case NFS3_CREATE_EXCLUSIVE:
463 args->verf = p;
464 p += 2;
465 break;
466 default:
467 return 0;
468 }
469
470 return xdr_argsize_check(rqstp, p);
471}
472
473int
474nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p)
475{
476 struct nfsd3_createargs *args = rqstp->rq_argp;
477
478 if (!(p = decode_fh(p, &args->fh)) ||
479 !(p = decode_filename(p, &args->name, &args->len)))
480 return 0;
481 p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
482
483 return xdr_argsize_check(rqstp, p);
484}
485
486int
487nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
488{
489 struct nfsd3_symlinkargs *args = rqstp->rq_argp;
490 char *base = (char *)p;
491 size_t dlen;
492
493 if (!(p = decode_fh(p, &args->ffh)) ||
494 !(p = decode_filename(p, &args->fname, &args->flen)))
495 return 0;
496 p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
497
498 args->tlen = ntohl(*p++);
499
500 args->first.iov_base = p;
501 args->first.iov_len = rqstp->rq_arg.head[0].iov_len;
502 args->first.iov_len -= (char *)p - base;
503
504 dlen = args->first.iov_len + rqstp->rq_arg.page_len +
505 rqstp->rq_arg.tail[0].iov_len;
506 if (dlen < XDR_QUADLEN(args->tlen) << 2)
507 return 0;
508 return 1;
509}
510
511int
512nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
513{
514 struct nfsd3_mknodargs *args = rqstp->rq_argp;
515
516 if (!(p = decode_fh(p, &args->fh))
517 || !(p = decode_filename(p, &args->name, &args->len)))
518 return 0;
519
520 args->ftype = ntohl(*p++);
521
522 if (args->ftype == NF3BLK || args->ftype == NF3CHR
523 || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
524 p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
525
526 if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
527 args->major = ntohl(*p++);
528 args->minor = ntohl(*p++);
529 }
530
531 return xdr_argsize_check(rqstp, p);
532}
533
534int
535nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
536{
537 struct nfsd3_renameargs *args = rqstp->rq_argp;
538
539 if (!(p = decode_fh(p, &args->ffh))
540 || !(p = decode_filename(p, &args->fname, &args->flen))
541 || !(p = decode_fh(p, &args->tfh))
542 || !(p = decode_filename(p, &args->tname, &args->tlen)))
543 return 0;
544
545 return xdr_argsize_check(rqstp, p);
546}
547
548int
549nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
550{
551 struct nfsd3_readlinkargs *args = rqstp->rq_argp;
552
553 p = decode_fh(p, &args->fh);
554 if (!p)
555 return 0;
556 args->buffer = page_address(*(rqstp->rq_next_page++));
557
558 return xdr_argsize_check(rqstp, p);
559}
560
561int
562nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
563{
564 struct nfsd3_linkargs *args = rqstp->rq_argp;
565
566 if (!(p = decode_fh(p, &args->ffh))
567 || !(p = decode_fh(p, &args->tfh))
568 || !(p = decode_filename(p, &args->tname, &args->tlen)))
569 return 0;
570
571 return xdr_argsize_check(rqstp, p);
572}
573
574int
575nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
576{
577 struct nfsd3_readdirargs *args = rqstp->rq_argp;
578 int len;
579 u32 max_blocksize = svc_max_payload(rqstp);
580
581 p = decode_fh(p, &args->fh);
582 if (!p)
583 return 0;
584 p = xdr_decode_hyper(p, &args->cookie);
585 args->verf = p; p += 2;
586 args->dircount = ~0;
587 args->count = ntohl(*p++);
588 len = args->count = min_t(u32, args->count, max_blocksize);
589
590 while (len > 0) {
591 struct page *p = *(rqstp->rq_next_page++);
592 if (!args->buffer)
593 args->buffer = page_address(p);
594 len -= PAGE_SIZE;
595 }
596
597 return xdr_argsize_check(rqstp, p);
598}
599
600int
601nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p)
602{
603 struct nfsd3_readdirargs *args = rqstp->rq_argp;
604 int len;
605 u32 max_blocksize = svc_max_payload(rqstp);
606
607 p = decode_fh(p, &args->fh);
608 if (!p)
609 return 0;
610 p = xdr_decode_hyper(p, &args->cookie);
611 args->verf = p; p += 2;
612 args->dircount = ntohl(*p++);
613 args->count = ntohl(*p++);
614
615 len = args->count = min(args->count, max_blocksize);
616 while (len > 0) {
617 struct page *p = *(rqstp->rq_next_page++);
618 if (!args->buffer)
619 args->buffer = page_address(p);
620 len -= PAGE_SIZE;
621 }
622
623 return xdr_argsize_check(rqstp, p);
624}
625
626int
627nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p)
628{
629 struct nfsd3_commitargs *args = rqstp->rq_argp;
630 p = decode_fh(p, &args->fh);
631 if (!p)
632 return 0;
633 p = xdr_decode_hyper(p, &args->offset);
634 args->count = ntohl(*p++);
635
636 return xdr_argsize_check(rqstp, p);
637}
638
639/*
640 * XDR encode functions
641 */
642/*
643 * There must be an encoding function for void results so svc_process
644 * will work properly.
645 */
646int
647nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
648{
649 return xdr_ressize_check(rqstp, p);
650}
651
652/* GETATTR */
653int
654nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
655{
656 struct nfsd3_attrstat *resp = rqstp->rq_resp;
657
658 if (resp->status == 0) {
659 lease_get_mtime(d_inode(resp->fh.fh_dentry),
660 &resp->stat.mtime);
661 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
662 }
663 return xdr_ressize_check(rqstp, p);
664}
665
666/* SETATTR, REMOVE, RMDIR */
667int
668nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p)
669{
670 struct nfsd3_attrstat *resp = rqstp->rq_resp;
671
672 p = encode_wcc_data(rqstp, p, &resp->fh);
673 return xdr_ressize_check(rqstp, p);
674}
675
676/* LOOKUP */
677int
678nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
679{
680 struct nfsd3_diropres *resp = rqstp->rq_resp;
681
682 if (resp->status == 0) {
683 p = encode_fh(p, &resp->fh);
684 p = encode_post_op_attr(rqstp, p, &resp->fh);
685 }
686 p = encode_post_op_attr(rqstp, p, &resp->dirfh);
687 return xdr_ressize_check(rqstp, p);
688}
689
690/* ACCESS */
691int
692nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
693{
694 struct nfsd3_accessres *resp = rqstp->rq_resp;
695
696 p = encode_post_op_attr(rqstp, p, &resp->fh);
697 if (resp->status == 0)
698 *p++ = htonl(resp->access);
699 return xdr_ressize_check(rqstp, p);
700}
701
702/* READLINK */
703int
704nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
705{
706 struct nfsd3_readlinkres *resp = rqstp->rq_resp;
707
708 p = encode_post_op_attr(rqstp, p, &resp->fh);
709 if (resp->status == 0) {
710 *p++ = htonl(resp->len);
711 xdr_ressize_check(rqstp, p);
712 rqstp->rq_res.page_len = resp->len;
713 if (resp->len & 3) {
714 /* need to pad the tail */
715 rqstp->rq_res.tail[0].iov_base = p;
716 *p = 0;
717 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
718 }
719 return 1;
720 } else
721 return xdr_ressize_check(rqstp, p);
722}
723
724/* READ */
725int
726nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
727{
728 struct nfsd3_readres *resp = rqstp->rq_resp;
729
730 p = encode_post_op_attr(rqstp, p, &resp->fh);
731 if (resp->status == 0) {
732 *p++ = htonl(resp->count);
733 *p++ = htonl(resp->eof);
734 *p++ = htonl(resp->count); /* xdr opaque count */
735 xdr_ressize_check(rqstp, p);
736 /* now update rqstp->rq_res to reflect data as well */
737 rqstp->rq_res.page_len = resp->count;
738 if (resp->count & 3) {
739 /* need to pad the tail */
740 rqstp->rq_res.tail[0].iov_base = p;
741 *p = 0;
742 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
743 }
744 return 1;
745 } else
746 return xdr_ressize_check(rqstp, p);
747}
748
749/* WRITE */
750int
751nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
752{
753 struct nfsd3_writeres *resp = rqstp->rq_resp;
754 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
755 __be32 verf[2];
756
757 p = encode_wcc_data(rqstp, p, &resp->fh);
758 if (resp->status == 0) {
759 *p++ = htonl(resp->count);
760 *p++ = htonl(resp->committed);
761 /* unique identifier, y2038 overflow can be ignored */
762 nfsd_copy_boot_verifier(verf, nn);
763 *p++ = verf[0];
764 *p++ = verf[1];
765 }
766 return xdr_ressize_check(rqstp, p);
767}
768
769/* CREATE, MKDIR, SYMLINK, MKNOD */
770int
771nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p)
772{
773 struct nfsd3_diropres *resp = rqstp->rq_resp;
774
775 if (resp->status == 0) {
776 *p++ = xdr_one;
777 p = encode_fh(p, &resp->fh);
778 p = encode_post_op_attr(rqstp, p, &resp->fh);
779 }
780 p = encode_wcc_data(rqstp, p, &resp->dirfh);
781 return xdr_ressize_check(rqstp, p);
782}
783
784/* RENAME */
785int
786nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p)
787{
788 struct nfsd3_renameres *resp = rqstp->rq_resp;
789
790 p = encode_wcc_data(rqstp, p, &resp->ffh);
791 p = encode_wcc_data(rqstp, p, &resp->tfh);
792 return xdr_ressize_check(rqstp, p);
793}
794
795/* LINK */
796int
797nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p)
798{
799 struct nfsd3_linkres *resp = rqstp->rq_resp;
800
801 p = encode_post_op_attr(rqstp, p, &resp->fh);
802 p = encode_wcc_data(rqstp, p, &resp->tfh);
803 return xdr_ressize_check(rqstp, p);
804}
805
806/* READDIR */
807int
808nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
809{
810 struct nfsd3_readdirres *resp = rqstp->rq_resp;
811
812 p = encode_post_op_attr(rqstp, p, &resp->fh);
813
814 if (resp->status == 0) {
815 /* stupid readdir cookie */
816 memcpy(p, resp->verf, 8); p += 2;
817 xdr_ressize_check(rqstp, p);
818 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
819 return 1; /*No room for trailer */
820 rqstp->rq_res.page_len = (resp->count) << 2;
821
822 /* add the 'tail' to the end of the 'head' page - page 0. */
823 rqstp->rq_res.tail[0].iov_base = p;
824 *p++ = 0; /* no more entries */
825 *p++ = htonl(resp->common.err == nfserr_eof);
826 rqstp->rq_res.tail[0].iov_len = 2<<2;
827 return 1;
828 } else
829 return xdr_ressize_check(rqstp, p);
830}
831
832static __be32 *
833encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
834 int namlen, u64 ino)
835{
836 *p++ = xdr_one; /* mark entry present */
837 p = xdr_encode_hyper(p, ino); /* file id */
838 p = xdr_encode_array(p, name, namlen);/* name length & name */
839
840 cd->offset = p; /* remember pointer */
841 p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
842
843 return p;
844}
845
846static __be32
847compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
848 const char *name, int namlen, u64 ino)
849{
850 struct svc_export *exp;
851 struct dentry *dparent, *dchild;
852 __be32 rv = nfserr_noent;
853
854 dparent = cd->fh.fh_dentry;
855 exp = cd->fh.fh_export;
856
857 if (isdotent(name, namlen)) {
858 if (namlen == 2) {
859 dchild = dget_parent(dparent);
860 /* filesystem root - cannot return filehandle for ".." */
861 if (dchild == dparent)
862 goto out;
863 } else
864 dchild = dget(dparent);
865 } else
866 dchild = lookup_one_len_unlocked(name, dparent, namlen);
867 if (IS_ERR(dchild))
868 return rv;
869 if (d_mountpoint(dchild))
870 goto out;
871 if (d_really_is_negative(dchild))
872 goto out;
873 if (dchild->d_inode->i_ino != ino)
874 goto out;
875 rv = fh_compose(fhp, exp, dchild, &cd->fh);
876out:
877 dput(dchild);
878 return rv;
879}
880
881static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino)
882{
883 struct svc_fh *fh = &cd->scratch;
884 __be32 err;
885
886 fh_init(fh, NFS3_FHSIZE);
887 err = compose_entry_fh(cd, fh, name, namlen, ino);
888 if (err) {
889 *p++ = 0;
890 *p++ = 0;
891 goto out;
892 }
893 p = encode_post_op_attr(cd->rqstp, p, fh);
894 *p++ = xdr_one; /* yes, a file handle follows */
895 p = encode_fh(p, fh);
896out:
897 fh_put(fh);
898 return p;
899}
900
901/*
902 * Encode a directory entry. This one works for both normal readdir
903 * and readdirplus.
904 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
905 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
906 *
907 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
908 * file handle.
909 */
910
911#define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1)
912#define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
913static int
914encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
915 loff_t offset, u64 ino, unsigned int d_type, int plus)
916{
917 struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
918 common);
919 __be32 *p = cd->buffer;
920 caddr_t curr_page_addr = NULL;
921 struct page ** page;
922 int slen; /* string (name) length */
923 int elen; /* estimated entry length in words */
924 int num_entry_words = 0; /* actual number of words */
925
926 if (cd->offset) {
927 u64 offset64 = offset;
928
929 if (unlikely(cd->offset1)) {
930 /* we ended up with offset on a page boundary */
931 *cd->offset = htonl(offset64 >> 32);
932 *cd->offset1 = htonl(offset64 & 0xffffffff);
933 cd->offset1 = NULL;
934 } else {
935 xdr_encode_hyper(cd->offset, offset64);
936 }
937 cd->offset = NULL;
938 }
939
940 /*
941 dprintk("encode_entry(%.*s @%ld%s)\n",
942 namlen, name, (long) offset, plus? " plus" : "");
943 */
944
945 /* truncate filename if too long */
946 namlen = min(namlen, NFS3_MAXNAMLEN);
947
948 slen = XDR_QUADLEN(namlen);
949 elen = slen + NFS3_ENTRY_BAGGAGE
950 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
951
952 if (cd->buflen < elen) {
953 cd->common.err = nfserr_toosmall;
954 return -EINVAL;
955 }
956
957 /* determine which page in rq_respages[] we are currently filling */
958 for (page = cd->rqstp->rq_respages + 1;
959 page < cd->rqstp->rq_next_page; page++) {
960 curr_page_addr = page_address(*page);
961
962 if (((caddr_t)cd->buffer >= curr_page_addr) &&
963 ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE))
964 break;
965 }
966
967 if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
968 /* encode entry in current page */
969
970 p = encode_entry_baggage(cd, p, name, namlen, ino);
971
972 if (plus)
973 p = encode_entryplus_baggage(cd, p, name, namlen, ino);
974 num_entry_words = p - cd->buffer;
975 } else if (*(page+1) != NULL) {
976 /* temporarily encode entry into next page, then move back to
977 * current and next page in rq_respages[] */
978 __be32 *p1, *tmp;
979 int len1, len2;
980
981 /* grab next page for temporary storage of entry */
982 p1 = tmp = page_address(*(page+1));
983
984 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
985
986 if (plus)
987 p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino);
988
989 /* determine entry word length and lengths to go in pages */
990 num_entry_words = p1 - tmp;
991 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
992 if ((num_entry_words << 2) < len1) {
993 /* the actual number of words in the entry is less
994 * than elen and can still fit in the current page
995 */
996 memmove(p, tmp, num_entry_words << 2);
997 p += num_entry_words;
998
999 /* update offset */
1000 cd->offset = cd->buffer + (cd->offset - tmp);
1001 } else {
1002 unsigned int offset_r = (cd->offset - tmp) << 2;
1003
1004 /* update pointer to offset location.
1005 * This is a 64bit quantity, so we need to
1006 * deal with 3 cases:
1007 * - entirely in first page
1008 * - entirely in second page
1009 * - 4 bytes in each page
1010 */
1011 if (offset_r + 8 <= len1) {
1012 cd->offset = p + (cd->offset - tmp);
1013 } else if (offset_r >= len1) {
1014 cd->offset -= len1 >> 2;
1015 } else {
1016 /* sitting on the fence */
1017 BUG_ON(offset_r != len1 - 4);
1018 cd->offset = p + (cd->offset - tmp);
1019 cd->offset1 = tmp;
1020 }
1021
1022 len2 = (num_entry_words << 2) - len1;
1023
1024 /* move from temp page to current and next pages */
1025 memmove(p, tmp, len1);
1026 memmove(tmp, (caddr_t)tmp+len1, len2);
1027
1028 p = tmp + (len2 >> 2);
1029 }
1030 }
1031 else {
1032 cd->common.err = nfserr_toosmall;
1033 return -EINVAL;
1034 }
1035
1036 cd->buflen -= num_entry_words;
1037 cd->buffer = p;
1038 cd->common.err = nfs_ok;
1039 return 0;
1040
1041}
1042
1043int
1044nfs3svc_encode_entry(void *cd, const char *name,
1045 int namlen, loff_t offset, u64 ino, unsigned int d_type)
1046{
1047 return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1048}
1049
1050int
1051nfs3svc_encode_entry_plus(void *cd, const char *name,
1052 int namlen, loff_t offset, u64 ino,
1053 unsigned int d_type)
1054{
1055 return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1056}
1057
1058/* FSSTAT */
1059int
1060nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p)
1061{
1062 struct nfsd3_fsstatres *resp = rqstp->rq_resp;
1063 struct kstatfs *s = &resp->stats;
1064 u64 bs = s->f_bsize;
1065
1066 *p++ = xdr_zero; /* no post_op_attr */
1067
1068 if (resp->status == 0) {
1069 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1070 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1071 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1072 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1073 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1074 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1075 *p++ = htonl(resp->invarsec); /* mean unchanged time */
1076 }
1077 return xdr_ressize_check(rqstp, p);
1078}
1079
1080/* FSINFO */
1081int
1082nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p)
1083{
1084 struct nfsd3_fsinfores *resp = rqstp->rq_resp;
1085
1086 *p++ = xdr_zero; /* no post_op_attr */
1087
1088 if (resp->status == 0) {
1089 *p++ = htonl(resp->f_rtmax);
1090 *p++ = htonl(resp->f_rtpref);
1091 *p++ = htonl(resp->f_rtmult);
1092 *p++ = htonl(resp->f_wtmax);
1093 *p++ = htonl(resp->f_wtpref);
1094 *p++ = htonl(resp->f_wtmult);
1095 *p++ = htonl(resp->f_dtpref);
1096 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1097 *p++ = xdr_one;
1098 *p++ = xdr_zero;
1099 *p++ = htonl(resp->f_properties);
1100 }
1101
1102 return xdr_ressize_check(rqstp, p);
1103}
1104
1105/* PATHCONF */
1106int
1107nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p)
1108{
1109 struct nfsd3_pathconfres *resp = rqstp->rq_resp;
1110
1111 *p++ = xdr_zero; /* no post_op_attr */
1112
1113 if (resp->status == 0) {
1114 *p++ = htonl(resp->p_link_max);
1115 *p++ = htonl(resp->p_name_max);
1116 *p++ = htonl(resp->p_no_trunc);
1117 *p++ = htonl(resp->p_chown_restricted);
1118 *p++ = htonl(resp->p_case_insensitive);
1119 *p++ = htonl(resp->p_case_preserving);
1120 }
1121
1122 return xdr_ressize_check(rqstp, p);
1123}
1124
1125/* COMMIT */
1126int
1127nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p)
1128{
1129 struct nfsd3_commitres *resp = rqstp->rq_resp;
1130 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1131 __be32 verf[2];
1132
1133 p = encode_wcc_data(rqstp, p, &resp->fh);
1134 /* Write verifier */
1135 if (resp->status == 0) {
1136 /* unique identifier, y2038 overflow can be ignored */
1137 nfsd_copy_boot_verifier(verf, nn);
1138 *p++ = verf[0];
1139 *p++ = verf[1];
1140 }
1141 return xdr_ressize_check(rqstp, p);
1142}
1143
1144/*
1145 * XDR release functions
1146 */
1147void
1148nfs3svc_release_fhandle(struct svc_rqst *rqstp)
1149{
1150 struct nfsd3_attrstat *resp = rqstp->rq_resp;
1151
1152 fh_put(&resp->fh);
1153}
1154
1155void
1156nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
1157{
1158 struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;
1159
1160 fh_put(&resp->fh1);
1161 fh_put(&resp->fh2);
1162}