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 u32 beginoffset, totalcount;
329
330 if (!svcxdr_decode_fhandle(xdr, &args->fh))
331 return 0;
332 /* beginoffset is ignored */
333 if (xdr_stream_decode_u32(xdr, &beginoffset) < 0)
334 return 0;
335 if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
336 return 0;
337 /* totalcount is ignored */
338 if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
339 return 0;
340
341 /* opaque data */
342 if (xdr_stream_decode_u32(xdr, &args->len) < 0)
343 return 0;
344 if (args->len > NFSSVC_MAXBLKSIZE_V2)
345 return 0;
346 if (!xdr_stream_subsegment(xdr, &args->payload, args->len))
347 return 0;
348
349 return 1;
350 }
351
352 int
nfssvc_decode_createargs(struct svc_rqst * rqstp,__be32 * p)353 nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
354 {
355 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
356 struct nfsd_createargs *args = rqstp->rq_argp;
357
358 return svcxdr_decode_diropargs(xdr, &args->fh,
359 &args->name, &args->len) &&
360 svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
361 }
362
363 int
nfssvc_decode_renameargs(struct svc_rqst * rqstp,__be32 * p)364 nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
365 {
366 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
367 struct nfsd_renameargs *args = rqstp->rq_argp;
368
369 return svcxdr_decode_diropargs(xdr, &args->ffh,
370 &args->fname, &args->flen) &&
371 svcxdr_decode_diropargs(xdr, &args->tfh,
372 &args->tname, &args->tlen);
373 }
374
375 int
nfssvc_decode_linkargs(struct svc_rqst * rqstp,__be32 * p)376 nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
377 {
378 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
379 struct nfsd_linkargs *args = rqstp->rq_argp;
380
381 return svcxdr_decode_fhandle(xdr, &args->ffh) &&
382 svcxdr_decode_diropargs(xdr, &args->tfh,
383 &args->tname, &args->tlen);
384 }
385
386 int
nfssvc_decode_symlinkargs(struct svc_rqst * rqstp,__be32 * p)387 nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
388 {
389 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
390 struct nfsd_symlinkargs *args = rqstp->rq_argp;
391 struct kvec *head = rqstp->rq_arg.head;
392
393 if (!svcxdr_decode_diropargs(xdr, &args->ffh, &args->fname, &args->flen))
394 return 0;
395 if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
396 return 0;
397 if (args->tlen == 0)
398 return 0;
399
400 args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
401 args->first.iov_base = xdr_inline_decode(xdr, args->tlen);
402 if (!args->first.iov_base)
403 return 0;
404 return svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
405 }
406
407 int
nfssvc_decode_readdirargs(struct svc_rqst * rqstp,__be32 * p)408 nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
409 {
410 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
411 struct nfsd_readdirargs *args = rqstp->rq_argp;
412
413 if (!svcxdr_decode_fhandle(xdr, &args->fh))
414 return 0;
415 if (xdr_stream_decode_u32(xdr, &args->cookie) < 0)
416 return 0;
417 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
418 return 0;
419
420 return 1;
421 }
422
423 /*
424 * XDR encode functions
425 */
426
427 int
nfssvc_encode_statres(struct svc_rqst * rqstp,__be32 * p)428 nfssvc_encode_statres(struct svc_rqst *rqstp, __be32 *p)
429 {
430 struct xdr_stream *xdr = &rqstp->rq_res_stream;
431 struct nfsd_stat *resp = rqstp->rq_resp;
432
433 return svcxdr_encode_stat(xdr, resp->status);
434 }
435
436 int
nfssvc_encode_attrstatres(struct svc_rqst * rqstp,__be32 * p)437 nfssvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p)
438 {
439 struct xdr_stream *xdr = &rqstp->rq_res_stream;
440 struct nfsd_attrstat *resp = rqstp->rq_resp;
441
442 if (!svcxdr_encode_stat(xdr, resp->status))
443 return 0;
444 switch (resp->status) {
445 case nfs_ok:
446 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
447 return 0;
448 break;
449 }
450
451 return 1;
452 }
453
454 int
nfssvc_encode_diropres(struct svc_rqst * rqstp,__be32 * p)455 nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
456 {
457 struct xdr_stream *xdr = &rqstp->rq_res_stream;
458 struct nfsd_diropres *resp = rqstp->rq_resp;
459
460 if (!svcxdr_encode_stat(xdr, resp->status))
461 return 0;
462 switch (resp->status) {
463 case nfs_ok:
464 if (!svcxdr_encode_fhandle(xdr, &resp->fh))
465 return 0;
466 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
467 return 0;
468 break;
469 }
470
471 return 1;
472 }
473
474 int
nfssvc_encode_readlinkres(struct svc_rqst * rqstp,__be32 * p)475 nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
476 {
477 struct xdr_stream *xdr = &rqstp->rq_res_stream;
478 struct nfsd_readlinkres *resp = rqstp->rq_resp;
479 struct kvec *head = rqstp->rq_res.head;
480
481 if (!svcxdr_encode_stat(xdr, resp->status))
482 return 0;
483 switch (resp->status) {
484 case nfs_ok:
485 if (xdr_stream_encode_u32(xdr, resp->len) < 0)
486 return 0;
487 xdr_write_pages(xdr, &resp->page, 0, resp->len);
488 if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0)
489 return 0;
490 break;
491 }
492
493 return 1;
494 }
495
496 int
nfssvc_encode_readres(struct svc_rqst * rqstp,__be32 * p)497 nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
498 {
499 struct xdr_stream *xdr = &rqstp->rq_res_stream;
500 struct nfsd_readres *resp = rqstp->rq_resp;
501 struct kvec *head = rqstp->rq_res.head;
502
503 if (!svcxdr_encode_stat(xdr, resp->status))
504 return 0;
505 switch (resp->status) {
506 case nfs_ok:
507 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
508 return 0;
509 if (xdr_stream_encode_u32(xdr, resp->count) < 0)
510 return 0;
511 xdr_write_pages(xdr, resp->pages, rqstp->rq_res.page_base,
512 resp->count);
513 if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0)
514 return 0;
515 break;
516 }
517
518 return 1;
519 }
520
521 int
nfssvc_encode_readdirres(struct svc_rqst * rqstp,__be32 * p)522 nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
523 {
524 struct xdr_stream *xdr = &rqstp->rq_res_stream;
525 struct nfsd_readdirres *resp = rqstp->rq_resp;
526 struct xdr_buf *dirlist = &resp->dirlist;
527
528 if (!svcxdr_encode_stat(xdr, resp->status))
529 return 0;
530 switch (resp->status) {
531 case nfs_ok:
532 xdr_write_pages(xdr, dirlist->pages, 0, dirlist->len);
533 /* no more entries */
534 if (xdr_stream_encode_item_absent(xdr) < 0)
535 return 0;
536 if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
537 return 0;
538 break;
539 }
540
541 return 1;
542 }
543
544 int
nfssvc_encode_statfsres(struct svc_rqst * rqstp,__be32 * p)545 nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p)
546 {
547 struct xdr_stream *xdr = &rqstp->rq_res_stream;
548 struct nfsd_statfsres *resp = rqstp->rq_resp;
549 struct kstatfs *stat = &resp->stats;
550
551 if (!svcxdr_encode_stat(xdr, resp->status))
552 return 0;
553 switch (resp->status) {
554 case nfs_ok:
555 p = xdr_reserve_space(xdr, XDR_UNIT * 5);
556 if (!p)
557 return 0;
558 *p++ = cpu_to_be32(NFSSVC_MAXBLKSIZE_V2);
559 *p++ = cpu_to_be32(stat->f_bsize);
560 *p++ = cpu_to_be32(stat->f_blocks);
561 *p++ = cpu_to_be32(stat->f_bfree);
562 *p = cpu_to_be32(stat->f_bavail);
563 break;
564 }
565
566 return 1;
567 }
568
569 /**
570 * nfssvc_encode_nfscookie - Encode a directory offset cookie
571 * @resp: readdir result context
572 * @offset: offset cookie to encode
573 *
574 * The buffer space for the offset cookie has already been reserved
575 * by svcxdr_encode_entry_common().
576 */
nfssvc_encode_nfscookie(struct nfsd_readdirres * resp,u32 offset)577 void nfssvc_encode_nfscookie(struct nfsd_readdirres *resp, u32 offset)
578 {
579 __be32 cookie = cpu_to_be32(offset);
580
581 if (!resp->cookie_offset)
582 return;
583
584 write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie,
585 sizeof(cookie));
586 resp->cookie_offset = 0;
587 }
588
589 static bool
svcxdr_encode_entry_common(struct nfsd_readdirres * resp,const char * name,int namlen,loff_t offset,u64 ino)590 svcxdr_encode_entry_common(struct nfsd_readdirres *resp, const char *name,
591 int namlen, loff_t offset, u64 ino)
592 {
593 struct xdr_buf *dirlist = &resp->dirlist;
594 struct xdr_stream *xdr = &resp->xdr;
595
596 if (xdr_stream_encode_item_present(xdr) < 0)
597 return false;
598 /* fileid */
599 if (xdr_stream_encode_u32(xdr, (u32)ino) < 0)
600 return false;
601 /* name */
602 if (xdr_stream_encode_opaque(xdr, name, min(namlen, NFS2_MAXNAMLEN)) < 0)
603 return false;
604 /* cookie */
605 resp->cookie_offset = dirlist->len;
606 if (xdr_stream_encode_u32(xdr, ~0U) < 0)
607 return false;
608
609 return true;
610 }
611
612 /**
613 * nfssvc_encode_entry - encode one NFSv2 READDIR entry
614 * @data: directory context
615 * @name: name of the object to be encoded
616 * @namlen: length of that name, in bytes
617 * @offset: the offset of the previous entry
618 * @ino: the fileid of this entry
619 * @d_type: unused
620 *
621 * Return values:
622 * %0: Entry was successfully encoded.
623 * %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
624 *
625 * On exit, the following fields are updated:
626 * - resp->xdr
627 * - resp->common.err
628 * - resp->cookie_offset
629 */
nfssvc_encode_entry(void * data,const char * name,int namlen,loff_t offset,u64 ino,unsigned int d_type)630 int nfssvc_encode_entry(void *data, const char *name, int namlen,
631 loff_t offset, u64 ino, unsigned int d_type)
632 {
633 struct readdir_cd *ccd = data;
634 struct nfsd_readdirres *resp = container_of(ccd,
635 struct nfsd_readdirres,
636 common);
637 unsigned int starting_length = resp->dirlist.len;
638
639 /* The offset cookie for the previous entry */
640 nfssvc_encode_nfscookie(resp, offset);
641
642 if (!svcxdr_encode_entry_common(resp, name, namlen, offset, ino))
643 goto out_toosmall;
644
645 xdr_commit_encode(&resp->xdr);
646 resp->common.err = nfs_ok;
647 return 0;
648
649 out_toosmall:
650 resp->cookie_offset = 0;
651 resp->common.err = nfserr_toosmall;
652 resp->dirlist.len = starting_length;
653 return -EINVAL;
654 }
655
656 /*
657 * XDR release functions
658 */
nfssvc_release_attrstat(struct svc_rqst * rqstp)659 void nfssvc_release_attrstat(struct svc_rqst *rqstp)
660 {
661 struct nfsd_attrstat *resp = rqstp->rq_resp;
662
663 fh_put(&resp->fh);
664 }
665
nfssvc_release_diropres(struct svc_rqst * rqstp)666 void nfssvc_release_diropres(struct svc_rqst *rqstp)
667 {
668 struct nfsd_diropres *resp = rqstp->rq_resp;
669
670 fh_put(&resp->fh);
671 }
672
nfssvc_release_readres(struct svc_rqst * rqstp)673 void nfssvc_release_readres(struct svc_rqst *rqstp)
674 {
675 struct nfsd_readres *resp = rqstp->rq_resp;
676
677 fh_put(&resp->fh);
678 }
679