1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * XDR support for nfsd
4 *
5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
6 */
7
8 #include "vfs.h"
9 #include "xdr.h"
10 #include "auth.h"
11
12 /*
13 * Mapping of S_IF* types to NFS file types
14 */
15 static const u32 nfs_ftypes[] = {
16 NFNON, NFCHR, NFCHR, NFBAD,
17 NFDIR, NFBAD, NFBLK, NFBAD,
18 NFREG, NFBAD, NFLNK, NFBAD,
19 NFSOCK, NFBAD, NFLNK, NFBAD,
20 };
21
22
23 /*
24 * Basic NFSv2 data types (RFC 1094 Section 2.3)
25 */
26
27 /**
28 * svcxdr_encode_stat - Encode an NFSv2 status code
29 * @xdr: XDR stream
30 * @status: status value to encode
31 *
32 * Return values:
33 * %false: Send buffer space was exhausted
34 * %true: Success
35 */
36 bool
svcxdr_encode_stat(struct xdr_stream * xdr,__be32 status)37 svcxdr_encode_stat(struct xdr_stream *xdr, __be32 status)
38 {
39 __be32 *p;
40
41 p = xdr_reserve_space(xdr, sizeof(status));
42 if (!p)
43 return false;
44 *p = status;
45
46 return true;
47 }
48
49 /**
50 * svcxdr_decode_fhandle - Decode an NFSv2 file handle
51 * @xdr: XDR stream positioned at an encoded NFSv2 FH
52 * @fhp: OUT: filled-in server file handle
53 *
54 * Return values:
55 * %false: The encoded file handle was not valid
56 * %true: @fhp has been initialized
57 */
58 bool
svcxdr_decode_fhandle(struct xdr_stream * xdr,struct svc_fh * fhp)59 svcxdr_decode_fhandle(struct xdr_stream *xdr, struct svc_fh *fhp)
60 {
61 __be32 *p;
62
63 p = xdr_inline_decode(xdr, NFS_FHSIZE);
64 if (!p)
65 return false;
66 fh_init(fhp, NFS_FHSIZE);
67 memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
68 fhp->fh_handle.fh_size = NFS_FHSIZE;
69
70 return true;
71 }
72
73 static bool
svcxdr_encode_fhandle(struct xdr_stream * xdr,const struct svc_fh * fhp)74 svcxdr_encode_fhandle(struct xdr_stream *xdr, const struct svc_fh *fhp)
75 {
76 __be32 *p;
77
78 p = xdr_reserve_space(xdr, NFS_FHSIZE);
79 if (!p)
80 return false;
81 memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
82
83 return true;
84 }
85
86 static __be32 *
encode_timeval(__be32 * p,const struct timespec64 * time)87 encode_timeval(__be32 *p, const struct timespec64 *time)
88 {
89 *p++ = cpu_to_be32((u32)time->tv_sec);
90 if (time->tv_nsec)
91 *p++ = cpu_to_be32(time->tv_nsec / NSEC_PER_USEC);
92 else
93 *p++ = xdr_zero;
94 return p;
95 }
96
97 static bool
svcxdr_decode_filename(struct xdr_stream * xdr,char ** name,unsigned int * len)98 svcxdr_decode_filename(struct xdr_stream *xdr, char **name, unsigned int *len)
99 {
100 u32 size, i;
101 __be32 *p;
102 char *c;
103
104 if (xdr_stream_decode_u32(xdr, &size) < 0)
105 return false;
106 if (size == 0 || size > NFS_MAXNAMLEN)
107 return false;
108 p = xdr_inline_decode(xdr, size);
109 if (!p)
110 return false;
111
112 *len = size;
113 *name = (char *)p;
114 for (i = 0, c = *name; i < size; i++, c++)
115 if (*c == '\0' || *c == '/')
116 return false;
117
118 return true;
119 }
120
121 static bool
svcxdr_decode_diropargs(struct xdr_stream * xdr,struct svc_fh * fhp,char ** name,unsigned int * len)122 svcxdr_decode_diropargs(struct xdr_stream *xdr, struct svc_fh *fhp,
123 char **name, unsigned int *len)
124 {
125 return svcxdr_decode_fhandle(xdr, fhp) &&
126 svcxdr_decode_filename(xdr, name, len);
127 }
128
129 static bool
svcxdr_decode_sattr(struct svc_rqst * rqstp,struct xdr_stream * xdr,struct iattr * iap)130 svcxdr_decode_sattr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
131 struct iattr *iap)
132 {
133 u32 tmp1, tmp2;
134 __be32 *p;
135
136 p = xdr_inline_decode(xdr, XDR_UNIT * 8);
137 if (!p)
138 return false;
139
140 iap->ia_valid = 0;
141
142 /*
143 * Some Sun clients put 0xffff in the mode field when they
144 * mean 0xffffffff.
145 */
146 tmp1 = be32_to_cpup(p++);
147 if (tmp1 != (u32)-1 && tmp1 != 0xffff) {
148 iap->ia_valid |= ATTR_MODE;
149 iap->ia_mode = tmp1;
150 }
151
152 tmp1 = be32_to_cpup(p++);
153 if (tmp1 != (u32)-1) {
154 iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), tmp1);
155 if (uid_valid(iap->ia_uid))
156 iap->ia_valid |= ATTR_UID;
157 }
158
159 tmp1 = be32_to_cpup(p++);
160 if (tmp1 != (u32)-1) {
161 iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), tmp1);
162 if (gid_valid(iap->ia_gid))
163 iap->ia_valid |= ATTR_GID;
164 }
165
166 tmp1 = be32_to_cpup(p++);
167 if (tmp1 != (u32)-1) {
168 iap->ia_valid |= ATTR_SIZE;
169 iap->ia_size = tmp1;
170 }
171
172 tmp1 = be32_to_cpup(p++);
173 tmp2 = be32_to_cpup(p++);
174 if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
175 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
176 iap->ia_atime.tv_sec = tmp1;
177 iap->ia_atime.tv_nsec = tmp2 * NSEC_PER_USEC;
178 }
179
180 tmp1 = be32_to_cpup(p++);
181 tmp2 = be32_to_cpup(p++);
182 if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
183 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
184 iap->ia_mtime.tv_sec = tmp1;
185 iap->ia_mtime.tv_nsec = tmp2 * NSEC_PER_USEC;
186 /*
187 * Passing the invalid value useconds=1000000 for mtime
188 * is a Sun convention for "set both mtime and atime to
189 * current server time". It's needed to make permissions
190 * checks for the "touch" program across v2 mounts to
191 * Solaris and Irix boxes work correctly. See description of
192 * sattr in section 6.1 of "NFS Illustrated" by
193 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
194 */
195 if (tmp2 == 1000000)
196 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
197 }
198
199 return true;
200 }
201
202 /**
203 * svcxdr_encode_fattr - Encode NFSv2 file attributes
204 * @rqstp: Context of a completed RPC transaction
205 * @xdr: XDR stream
206 * @fhp: File handle to encode
207 * @stat: Attributes to encode
208 *
209 * Return values:
210 * %false: Send buffer space was exhausted
211 * %true: Success
212 */
213 bool
svcxdr_encode_fattr(struct svc_rqst * rqstp,struct xdr_stream * xdr,const struct svc_fh * fhp,const struct kstat * stat)214 svcxdr_encode_fattr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
215 const struct svc_fh *fhp, const struct kstat *stat)
216 {
217 struct user_namespace *userns = nfsd_user_namespace(rqstp);
218 struct dentry *dentry = fhp->fh_dentry;
219 int type = stat->mode & S_IFMT;
220 struct timespec64 time;
221 __be32 *p;
222 u32 fsid;
223
224 p = xdr_reserve_space(xdr, XDR_UNIT * 17);
225 if (!p)
226 return false;
227
228 *p++ = cpu_to_be32(nfs_ftypes[type >> 12]);
229 *p++ = cpu_to_be32((u32)stat->mode);
230 *p++ = cpu_to_be32((u32)stat->nlink);
231 *p++ = cpu_to_be32((u32)from_kuid_munged(userns, stat->uid));
232 *p++ = cpu_to_be32((u32)from_kgid_munged(userns, stat->gid));
233
234 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN)
235 *p++ = cpu_to_be32(NFS_MAXPATHLEN);
236 else
237 *p++ = cpu_to_be32((u32) stat->size);
238 *p++ = cpu_to_be32((u32) stat->blksize);
239 if (S_ISCHR(type) || S_ISBLK(type))
240 *p++ = cpu_to_be32(new_encode_dev(stat->rdev));
241 else
242 *p++ = cpu_to_be32(0xffffffff);
243 *p++ = cpu_to_be32((u32)stat->blocks);
244
245 switch (fsid_source(fhp)) {
246 case FSIDSOURCE_FSID:
247 fsid = (u32)fhp->fh_export->ex_fsid;
248 break;
249 case FSIDSOURCE_UUID:
250 fsid = ((u32 *)fhp->fh_export->ex_uuid)[0];
251 fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[1];
252 fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[2];
253 fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[3];
254 break;
255 default:
256 fsid = new_encode_dev(stat->dev);
257 break;
258 }
259 *p++ = cpu_to_be32(fsid);
260
261 *p++ = cpu_to_be32((u32)stat->ino);
262 p = encode_timeval(p, &stat->atime);
263 time = stat->mtime;
264 lease_get_mtime(d_inode(dentry), &time);
265 p = encode_timeval(p, &time);
266 encode_timeval(p, &stat->ctime);
267
268 return true;
269 }
270
271 /*
272 * XDR decode functions
273 */
274
275 int
nfssvc_decode_fhandleargs(struct svc_rqst * rqstp,__be32 * p)276 nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p)
277 {
278 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
279 struct nfsd_fhandle *args = rqstp->rq_argp;
280
281 return svcxdr_decode_fhandle(xdr, &args->fh);
282 }
283
284 int
nfssvc_decode_sattrargs(struct svc_rqst * rqstp,__be32 * p)285 nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
286 {
287 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
288 struct nfsd_sattrargs *args = rqstp->rq_argp;
289
290 return svcxdr_decode_fhandle(xdr, &args->fh) &&
291 svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
292 }
293
294 int
nfssvc_decode_diropargs(struct svc_rqst * rqstp,__be32 * p)295 nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
296 {
297 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
298 struct nfsd_diropargs *args = rqstp->rq_argp;
299
300 return svcxdr_decode_diropargs(xdr, &args->fh, &args->name, &args->len);
301 }
302
303 int
nfssvc_decode_readargs(struct svc_rqst * rqstp,__be32 * p)304 nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
305 {
306 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
307 struct nfsd_readargs *args = rqstp->rq_argp;
308 u32 totalcount;
309
310 if (!svcxdr_decode_fhandle(xdr, &args->fh))
311 return 0;
312 if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
313 return 0;
314 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
315 return 0;
316 /* totalcount is ignored */
317 if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
318 return 0;
319
320 return 1;
321 }
322
323 int
nfssvc_decode_writeargs(struct svc_rqst * rqstp,__be32 * p)324 nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
325 {
326 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
327 struct nfsd_writeargs *args = rqstp->rq_argp;
328 struct kvec *head = rqstp->rq_arg.head;
329 struct kvec *tail = rqstp->rq_arg.tail;
330 u32 beginoffset, totalcount;
331 size_t remaining;
332
333 if (!svcxdr_decode_fhandle(xdr, &args->fh))
334 return 0;
335 /* beginoffset is ignored */
336 if (xdr_stream_decode_u32(xdr, &beginoffset) < 0)
337 return 0;
338 if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
339 return 0;
340 /* totalcount is ignored */
341 if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
342 return 0;
343
344 /* opaque data */
345 if (xdr_stream_decode_u32(xdr, &args->len) < 0)
346 return 0;
347 if (args->len > NFSSVC_MAXBLKSIZE_V2)
348 return 0;
349 remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len;
350 remaining -= xdr_stream_pos(xdr);
351 if (remaining < xdr_align_size(args->len))
352 return 0;
353 args->first.iov_base = xdr->p;
354 args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
355
356 return 1;
357 }
358
359 int
nfssvc_decode_createargs(struct svc_rqst * rqstp,__be32 * p)360 nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
361 {
362 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
363 struct nfsd_createargs *args = rqstp->rq_argp;
364
365 return svcxdr_decode_diropargs(xdr, &args->fh,
366 &args->name, &args->len) &&
367 svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
368 }
369
370 int
nfssvc_decode_renameargs(struct svc_rqst * rqstp,__be32 * p)371 nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
372 {
373 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
374 struct nfsd_renameargs *args = rqstp->rq_argp;
375
376 return svcxdr_decode_diropargs(xdr, &args->ffh,
377 &args->fname, &args->flen) &&
378 svcxdr_decode_diropargs(xdr, &args->tfh,
379 &args->tname, &args->tlen);
380 }
381
382 int
nfssvc_decode_linkargs(struct svc_rqst * rqstp,__be32 * p)383 nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
384 {
385 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
386 struct nfsd_linkargs *args = rqstp->rq_argp;
387
388 return svcxdr_decode_fhandle(xdr, &args->ffh) &&
389 svcxdr_decode_diropargs(xdr, &args->tfh,
390 &args->tname, &args->tlen);
391 }
392
393 int
nfssvc_decode_symlinkargs(struct svc_rqst * rqstp,__be32 * p)394 nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
395 {
396 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
397 struct nfsd_symlinkargs *args = rqstp->rq_argp;
398 struct kvec *head = rqstp->rq_arg.head;
399
400 if (!svcxdr_decode_diropargs(xdr, &args->ffh, &args->fname, &args->flen))
401 return 0;
402 if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
403 return 0;
404 if (args->tlen == 0)
405 return 0;
406
407 args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
408 args->first.iov_base = xdr_inline_decode(xdr, args->tlen);
409 if (!args->first.iov_base)
410 return 0;
411 return svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
412 }
413
414 int
nfssvc_decode_readdirargs(struct svc_rqst * rqstp,__be32 * p)415 nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
416 {
417 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
418 struct nfsd_readdirargs *args = rqstp->rq_argp;
419
420 if (!svcxdr_decode_fhandle(xdr, &args->fh))
421 return 0;
422 if (xdr_stream_decode_u32(xdr, &args->cookie) < 0)
423 return 0;
424 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
425 return 0;
426
427 return 1;
428 }
429
430 /*
431 * XDR encode functions
432 */
433
434 int
nfssvc_encode_statres(struct svc_rqst * rqstp,__be32 * p)435 nfssvc_encode_statres(struct svc_rqst *rqstp, __be32 *p)
436 {
437 struct xdr_stream *xdr = &rqstp->rq_res_stream;
438 struct nfsd_stat *resp = rqstp->rq_resp;
439
440 return svcxdr_encode_stat(xdr, resp->status);
441 }
442
443 int
nfssvc_encode_attrstatres(struct svc_rqst * rqstp,__be32 * p)444 nfssvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p)
445 {
446 struct xdr_stream *xdr = &rqstp->rq_res_stream;
447 struct nfsd_attrstat *resp = rqstp->rq_resp;
448
449 if (!svcxdr_encode_stat(xdr, resp->status))
450 return 0;
451 switch (resp->status) {
452 case nfs_ok:
453 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
454 return 0;
455 break;
456 }
457
458 return 1;
459 }
460
461 int
nfssvc_encode_diropres(struct svc_rqst * rqstp,__be32 * p)462 nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
463 {
464 struct xdr_stream *xdr = &rqstp->rq_res_stream;
465 struct nfsd_diropres *resp = rqstp->rq_resp;
466
467 if (!svcxdr_encode_stat(xdr, resp->status))
468 return 0;
469 switch (resp->status) {
470 case nfs_ok:
471 if (!svcxdr_encode_fhandle(xdr, &resp->fh))
472 return 0;
473 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
474 return 0;
475 break;
476 }
477
478 return 1;
479 }
480
481 int
nfssvc_encode_readlinkres(struct svc_rqst * rqstp,__be32 * p)482 nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
483 {
484 struct xdr_stream *xdr = &rqstp->rq_res_stream;
485 struct nfsd_readlinkres *resp = rqstp->rq_resp;
486 struct kvec *head = rqstp->rq_res.head;
487
488 if (!svcxdr_encode_stat(xdr, resp->status))
489 return 0;
490 switch (resp->status) {
491 case nfs_ok:
492 if (xdr_stream_encode_u32(xdr, resp->len) < 0)
493 return 0;
494 xdr_write_pages(xdr, &resp->page, 0, resp->len);
495 if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0)
496 return 0;
497 break;
498 }
499
500 return 1;
501 }
502
503 int
nfssvc_encode_readres(struct svc_rqst * rqstp,__be32 * p)504 nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
505 {
506 struct xdr_stream *xdr = &rqstp->rq_res_stream;
507 struct nfsd_readres *resp = rqstp->rq_resp;
508 struct kvec *head = rqstp->rq_res.head;
509
510 if (!svcxdr_encode_stat(xdr, resp->status))
511 return 0;
512 switch (resp->status) {
513 case nfs_ok:
514 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
515 return 0;
516 if (xdr_stream_encode_u32(xdr, resp->count) < 0)
517 return 0;
518 xdr_write_pages(xdr, resp->pages, rqstp->rq_res.page_base,
519 resp->count);
520 if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0)
521 return 0;
522 break;
523 }
524
525 return 1;
526 }
527
528 int
nfssvc_encode_readdirres(struct svc_rqst * rqstp,__be32 * p)529 nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
530 {
531 struct xdr_stream *xdr = &rqstp->rq_res_stream;
532 struct nfsd_readdirres *resp = rqstp->rq_resp;
533 struct xdr_buf *dirlist = &resp->dirlist;
534
535 if (!svcxdr_encode_stat(xdr, resp->status))
536 return 0;
537 switch (resp->status) {
538 case nfs_ok:
539 xdr_write_pages(xdr, dirlist->pages, 0, dirlist->len);
540 /* no more entries */
541 if (xdr_stream_encode_item_absent(xdr) < 0)
542 return 0;
543 if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
544 return 0;
545 break;
546 }
547
548 return 1;
549 }
550
551 int
nfssvc_encode_statfsres(struct svc_rqst * rqstp,__be32 * p)552 nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p)
553 {
554 struct xdr_stream *xdr = &rqstp->rq_res_stream;
555 struct nfsd_statfsres *resp = rqstp->rq_resp;
556 struct kstatfs *stat = &resp->stats;
557
558 if (!svcxdr_encode_stat(xdr, resp->status))
559 return 0;
560 switch (resp->status) {
561 case nfs_ok:
562 p = xdr_reserve_space(xdr, XDR_UNIT * 5);
563 if (!p)
564 return 0;
565 *p++ = cpu_to_be32(NFSSVC_MAXBLKSIZE_V2);
566 *p++ = cpu_to_be32(stat->f_bsize);
567 *p++ = cpu_to_be32(stat->f_blocks);
568 *p++ = cpu_to_be32(stat->f_bfree);
569 *p = cpu_to_be32(stat->f_bavail);
570 break;
571 }
572
573 return 1;
574 }
575
576 /**
577 * nfssvc_encode_nfscookie - Encode a directory offset cookie
578 * @resp: readdir result context
579 * @offset: offset cookie to encode
580 *
581 * The buffer space for the offset cookie has already been reserved
582 * by svcxdr_encode_entry_common().
583 */
nfssvc_encode_nfscookie(struct nfsd_readdirres * resp,u32 offset)584 void nfssvc_encode_nfscookie(struct nfsd_readdirres *resp, u32 offset)
585 {
586 __be32 cookie = cpu_to_be32(offset);
587
588 if (!resp->cookie_offset)
589 return;
590
591 write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie,
592 sizeof(cookie));
593 resp->cookie_offset = 0;
594 }
595
596 static bool
svcxdr_encode_entry_common(struct nfsd_readdirres * resp,const char * name,int namlen,loff_t offset,u64 ino)597 svcxdr_encode_entry_common(struct nfsd_readdirres *resp, const char *name,
598 int namlen, loff_t offset, u64 ino)
599 {
600 struct xdr_buf *dirlist = &resp->dirlist;
601 struct xdr_stream *xdr = &resp->xdr;
602
603 if (xdr_stream_encode_item_present(xdr) < 0)
604 return false;
605 /* fileid */
606 if (xdr_stream_encode_u32(xdr, (u32)ino) < 0)
607 return false;
608 /* name */
609 if (xdr_stream_encode_opaque(xdr, name, min(namlen, NFS2_MAXNAMLEN)) < 0)
610 return false;
611 /* cookie */
612 resp->cookie_offset = dirlist->len;
613 if (xdr_stream_encode_u32(xdr, ~0U) < 0)
614 return false;
615
616 return true;
617 }
618
619 /**
620 * nfssvc_encode_entry - encode one NFSv2 READDIR entry
621 * @data: directory context
622 * @name: name of the object to be encoded
623 * @namlen: length of that name, in bytes
624 * @offset: the offset of the previous entry
625 * @ino: the fileid of this entry
626 * @d_type: unused
627 *
628 * Return values:
629 * %0: Entry was successfully encoded.
630 * %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
631 *
632 * On exit, the following fields are updated:
633 * - resp->xdr
634 * - resp->common.err
635 * - resp->cookie_offset
636 */
nfssvc_encode_entry(void * data,const char * name,int namlen,loff_t offset,u64 ino,unsigned int d_type)637 int nfssvc_encode_entry(void *data, const char *name, int namlen,
638 loff_t offset, u64 ino, unsigned int d_type)
639 {
640 struct readdir_cd *ccd = data;
641 struct nfsd_readdirres *resp = container_of(ccd,
642 struct nfsd_readdirres,
643 common);
644 unsigned int starting_length = resp->dirlist.len;
645
646 /* The offset cookie for the previous entry */
647 nfssvc_encode_nfscookie(resp, offset);
648
649 if (!svcxdr_encode_entry_common(resp, name, namlen, offset, ino))
650 goto out_toosmall;
651
652 xdr_commit_encode(&resp->xdr);
653 resp->common.err = nfs_ok;
654 return 0;
655
656 out_toosmall:
657 resp->cookie_offset = 0;
658 resp->common.err = nfserr_toosmall;
659 resp->dirlist.len = starting_length;
660 return -EINVAL;
661 }
662
663 /*
664 * XDR release functions
665 */
nfssvc_release_attrstat(struct svc_rqst * rqstp)666 void nfssvc_release_attrstat(struct svc_rqst *rqstp)
667 {
668 struct nfsd_attrstat *resp = rqstp->rq_resp;
669
670 fh_put(&resp->fh);
671 }
672
nfssvc_release_diropres(struct svc_rqst * rqstp)673 void nfssvc_release_diropres(struct svc_rqst *rqstp)
674 {
675 struct nfsd_diropres *resp = rqstp->rq_resp;
676
677 fh_put(&resp->fh);
678 }
679
nfssvc_release_readres(struct svc_rqst * rqstp)680 void nfssvc_release_readres(struct svc_rqst *rqstp)
681 {
682 struct nfsd_readres *resp = rqstp->rq_resp;
683
684 fh_put(&resp->fh);
685 }
686