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 <linux/filelock.h>
9
10 #include "vfs.h"
11 #include "xdr.h"
12 #include "auth.h"
13
14 /*
15 * Sun convention: a sattr time-useconds field of one full second (an
16 * otherwise out-of-range value) means "set this time to the current
17 * server time." It's needed to make permissions checks for the "touch"
18 * program across NFSv2 mounts work correctly. See description of
19 * sattr in section 6.1 of "NFS Illustrated" by Brent Callaghan,
20 * Addison-Wesley, ISBN 0-201-32750-5
21 */
22 #define NFS2_SATTR_SET_TO_SERVER_TIME (1000000)
23
24 /*
25 * Mapping of S_IF* types to NFS file types
26 */
27 static const u32 nfs_ftypes[] = {
28 NFNON, NFCHR, NFCHR, NFBAD,
29 NFDIR, NFBAD, NFBLK, NFBAD,
30 NFREG, NFBAD, NFLNK, NFBAD,
31 NFSOCK, NFBAD, NFLNK, NFBAD,
32 };
33
34
35 /*
36 * Basic NFSv2 data types (RFC 1094 Section 2.3)
37 */
38
39 /**
40 * svcxdr_encode_stat - Encode an NFSv2 status code
41 * @xdr: XDR stream
42 * @status: status value to encode
43 *
44 * Return values:
45 * %false: Send buffer space was exhausted
46 * %true: Success
47 */
48 bool
svcxdr_encode_stat(struct xdr_stream * xdr,__be32 status)49 svcxdr_encode_stat(struct xdr_stream *xdr, __be32 status)
50 {
51 __be32 *p;
52
53 p = xdr_reserve_space(xdr, sizeof(status));
54 if (!p)
55 return false;
56 *p = status;
57
58 return true;
59 }
60
61 /**
62 * svcxdr_decode_fhandle - Decode an NFSv2 file handle
63 * @xdr: XDR stream positioned at an encoded NFSv2 FH
64 * @fhp: OUT: filled-in server file handle
65 *
66 * Return values:
67 * %false: The encoded file handle was not valid
68 * %true: @fhp has been initialized
69 */
70 bool
svcxdr_decode_fhandle(struct xdr_stream * xdr,struct svc_fh * fhp)71 svcxdr_decode_fhandle(struct xdr_stream *xdr, struct svc_fh *fhp)
72 {
73 __be32 *p;
74
75 p = xdr_inline_decode(xdr, NFS_FHSIZE);
76 if (!p)
77 return false;
78 fh_init(fhp, NFS_FHSIZE);
79 memcpy(&fhp->fh_handle.fh_raw, p, NFS_FHSIZE);
80 fhp->fh_handle.fh_size = NFS_FHSIZE;
81
82 return true;
83 }
84
85 static bool
svcxdr_encode_fhandle(struct xdr_stream * xdr,const struct svc_fh * fhp)86 svcxdr_encode_fhandle(struct xdr_stream *xdr, const struct svc_fh *fhp)
87 {
88 __be32 *p;
89
90 p = xdr_reserve_space(xdr, NFS_FHSIZE);
91 if (!p)
92 return false;
93 memcpy(p, &fhp->fh_handle.fh_raw, NFS_FHSIZE);
94
95 return true;
96 }
97
98 static __be32 *
encode_timeval(__be32 * p,const struct timespec64 * time)99 encode_timeval(__be32 *p, const struct timespec64 *time)
100 {
101 *p++ = cpu_to_be32((u32)time->tv_sec);
102 if (time->tv_nsec)
103 *p++ = cpu_to_be32(time->tv_nsec / NSEC_PER_USEC);
104 else
105 *p++ = xdr_zero;
106 return p;
107 }
108
109 static bool
svcxdr_decode_filename(struct xdr_stream * xdr,char ** name,unsigned int * len)110 svcxdr_decode_filename(struct xdr_stream *xdr, char **name, unsigned int *len)
111 {
112 u32 size, i;
113 __be32 *p;
114 char *c;
115
116 if (xdr_stream_decode_u32(xdr, &size) < 0)
117 return false;
118 if (size == 0 || size > NFS_MAXNAMLEN)
119 return false;
120 p = xdr_inline_decode(xdr, size);
121 if (!p)
122 return false;
123
124 *len = size;
125 *name = (char *)p;
126 for (i = 0, c = *name; i < size; i++, c++)
127 if (*c == '\0' || *c == '/')
128 return false;
129
130 return true;
131 }
132
133 static bool
svcxdr_decode_diropargs(struct xdr_stream * xdr,struct svc_fh * fhp,char ** name,unsigned int * len)134 svcxdr_decode_diropargs(struct xdr_stream *xdr, struct svc_fh *fhp,
135 char **name, unsigned int *len)
136 {
137 return svcxdr_decode_fhandle(xdr, fhp) &&
138 svcxdr_decode_filename(xdr, name, len);
139 }
140
141 static bool
svcxdr_decode_sattr(struct svc_rqst * rqstp,struct xdr_stream * xdr,struct iattr * iap)142 svcxdr_decode_sattr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
143 struct iattr *iap)
144 {
145 u32 tmp1, tmp2;
146 __be32 *p;
147
148 p = xdr_inline_decode(xdr, XDR_UNIT * 8);
149 if (!p)
150 return false;
151
152 iap->ia_valid = 0;
153
154 /*
155 * Some Sun clients put 0xffff in the mode field when they
156 * mean 0xffffffff.
157 */
158 tmp1 = be32_to_cpup(p++);
159 if (tmp1 != (u32)-1 && tmp1 != 0xffff) {
160 iap->ia_valid |= ATTR_MODE;
161 iap->ia_mode = tmp1;
162 }
163
164 tmp1 = be32_to_cpup(p++);
165 if (tmp1 != (u32)-1) {
166 iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), tmp1);
167 if (uid_valid(iap->ia_uid))
168 iap->ia_valid |= ATTR_UID;
169 }
170
171 tmp1 = be32_to_cpup(p++);
172 if (tmp1 != (u32)-1) {
173 iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), tmp1);
174 if (gid_valid(iap->ia_gid))
175 iap->ia_valid |= ATTR_GID;
176 }
177
178 tmp1 = be32_to_cpup(p++);
179 if (tmp1 != (u32)-1) {
180 iap->ia_valid |= ATTR_SIZE;
181 iap->ia_size = tmp1;
182 }
183
184 tmp1 = be32_to_cpup(p++);
185 tmp2 = be32_to_cpup(p++);
186 if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
187 /*
188 * Range test here to prevent the multiplication from
189 * wrapping to a valid (but incorrect) value on 32-bit
190 * platforms.
191 */
192 if (tmp2 > NFS2_SATTR_SET_TO_SERVER_TIME)
193 return false;
194 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
195 iap->ia_atime.tv_sec = tmp1;
196 iap->ia_atime.tv_nsec = tmp2 * NSEC_PER_USEC;
197 if (tmp2 == NFS2_SATTR_SET_TO_SERVER_TIME)
198 iap->ia_valid &= ~ATTR_ATIME_SET;
199 }
200
201 tmp1 = be32_to_cpup(p++);
202 tmp2 = be32_to_cpup(p++);
203 if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
204 if (tmp2 > NFS2_SATTR_SET_TO_SERVER_TIME)
205 return false;
206 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
207 iap->ia_mtime.tv_sec = tmp1;
208 iap->ia_mtime.tv_nsec = tmp2 * NSEC_PER_USEC;
209 if (tmp2 == NFS2_SATTR_SET_TO_SERVER_TIME)
210 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
211 }
212
213 return true;
214 }
215
216 /**
217 * svcxdr_encode_fattr - Encode NFSv2 file attributes
218 * @rqstp: Context of a completed RPC transaction
219 * @xdr: XDR stream
220 * @fhp: File handle to encode
221 * @stat: Attributes to encode
222 *
223 * Return values:
224 * %false: Send buffer space was exhausted
225 * %true: Success
226 */
227 bool
svcxdr_encode_fattr(struct svc_rqst * rqstp,struct xdr_stream * xdr,const struct svc_fh * fhp,const struct kstat * stat)228 svcxdr_encode_fattr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
229 const struct svc_fh *fhp, const struct kstat *stat)
230 {
231 struct user_namespace *userns = nfsd_user_namespace(rqstp);
232 struct dentry *dentry = fhp->fh_dentry;
233 int type = stat->mode & S_IFMT;
234 struct timespec64 time;
235 __be32 *p;
236 u32 fsid;
237
238 p = xdr_reserve_space(xdr, XDR_UNIT * 17);
239 if (!p)
240 return false;
241
242 *p++ = cpu_to_be32(nfs_ftypes[type >> 12]);
243 *p++ = cpu_to_be32((u32)stat->mode);
244 *p++ = cpu_to_be32((u32)stat->nlink);
245 *p++ = cpu_to_be32((u32)from_kuid_munged(userns, stat->uid));
246 *p++ = cpu_to_be32((u32)from_kgid_munged(userns, stat->gid));
247
248 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN)
249 *p++ = cpu_to_be32(NFS_MAXPATHLEN);
250 else
251 *p++ = cpu_to_be32((u32) stat->size);
252 *p++ = cpu_to_be32((u32) stat->blksize);
253 if (S_ISCHR(type) || S_ISBLK(type))
254 *p++ = cpu_to_be32(new_encode_dev(stat->rdev));
255 else
256 *p++ = cpu_to_be32(0xffffffff);
257 *p++ = cpu_to_be32((u32)stat->blocks);
258
259 switch (fsid_source(fhp)) {
260 case FSIDSOURCE_FSID:
261 fsid = (u32)fhp->fh_export->ex_fsid;
262 break;
263 case FSIDSOURCE_UUID:
264 fsid = ((u32 *)fhp->fh_export->ex_uuid)[0];
265 fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[1];
266 fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[2];
267 fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[3];
268 break;
269 default:
270 fsid = new_encode_dev(stat->dev);
271 break;
272 }
273 *p++ = cpu_to_be32(fsid);
274
275 *p++ = cpu_to_be32((u32)stat->ino);
276 p = encode_timeval(p, &stat->atime);
277 time = stat->mtime;
278 lease_get_mtime(d_inode(dentry), &time);
279 p = encode_timeval(p, &time);
280 encode_timeval(p, &stat->ctime);
281
282 return true;
283 }
284
285 /*
286 * XDR decode functions
287 */
288
289 bool
nfssvc_decode_fhandleargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)290 nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
291 {
292 struct nfsd_fhandle *args = rqstp->rq_argp;
293
294 return svcxdr_decode_fhandle(xdr, &args->fh);
295 }
296
297 bool
nfssvc_decode_sattrargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)298 nfssvc_decode_sattrargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
299 {
300 struct nfsd_sattrargs *args = rqstp->rq_argp;
301
302 return svcxdr_decode_fhandle(xdr, &args->fh) &&
303 svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
304 }
305
306 bool
nfssvc_decode_diropargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)307 nfssvc_decode_diropargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
308 {
309 struct nfsd_diropargs *args = rqstp->rq_argp;
310
311 return svcxdr_decode_diropargs(xdr, &args->fh, &args->name, &args->len);
312 }
313
314 bool
nfssvc_decode_readargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)315 nfssvc_decode_readargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
316 {
317 struct nfsd_readargs *args = rqstp->rq_argp;
318 u32 totalcount;
319
320 if (!svcxdr_decode_fhandle(xdr, &args->fh))
321 return false;
322 if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
323 return false;
324 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
325 return false;
326 /* totalcount is ignored */
327 if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
328 return false;
329
330 return true;
331 }
332
333 bool
nfssvc_decode_writeargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)334 nfssvc_decode_writeargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
335 {
336 struct nfsd_writeargs *args = rqstp->rq_argp;
337 u32 beginoffset, totalcount;
338
339 if (!svcxdr_decode_fhandle(xdr, &args->fh))
340 return false;
341 /* beginoffset is ignored */
342 if (xdr_stream_decode_u32(xdr, &beginoffset) < 0)
343 return false;
344 if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
345 return false;
346 /* totalcount is ignored */
347 if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
348 return false;
349
350 /* opaque data */
351 if (xdr_stream_decode_u32(xdr, &args->len) < 0)
352 return false;
353 if (args->len > NFS_MAXDATA)
354 return false;
355
356 return xdr_stream_subsegment(xdr, &args->payload, args->len);
357 }
358
359 bool
nfssvc_decode_createargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)360 nfssvc_decode_createargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
361 {
362 struct nfsd_createargs *args = rqstp->rq_argp;
363
364 return svcxdr_decode_diropargs(xdr, &args->fh,
365 &args->name, &args->len) &&
366 svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
367 }
368
369 bool
nfssvc_decode_renameargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)370 nfssvc_decode_renameargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
371 {
372 struct nfsd_renameargs *args = rqstp->rq_argp;
373
374 return svcxdr_decode_diropargs(xdr, &args->ffh,
375 &args->fname, &args->flen) &&
376 svcxdr_decode_diropargs(xdr, &args->tfh,
377 &args->tname, &args->tlen);
378 }
379
380 bool
nfssvc_decode_linkargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)381 nfssvc_decode_linkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
382 {
383 struct nfsd_linkargs *args = rqstp->rq_argp;
384
385 return svcxdr_decode_fhandle(xdr, &args->ffh) &&
386 svcxdr_decode_diropargs(xdr, &args->tfh,
387 &args->tname, &args->tlen);
388 }
389
390 bool
nfssvc_decode_symlinkargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)391 nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
392 {
393 struct nfsd_symlinkargs *args = rqstp->rq_argp;
394 struct kvec *head = rqstp->rq_arg.head;
395
396 if (!svcxdr_decode_diropargs(xdr, &args->ffh, &args->fname, &args->flen))
397 return false;
398 if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
399 return false;
400 if (args->tlen == 0)
401 return false;
402
403 args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
404 args->first.iov_base = xdr_inline_decode(xdr, args->tlen);
405 if (!args->first.iov_base)
406 return false;
407 return svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
408 }
409
410 bool
nfssvc_decode_readdirargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)411 nfssvc_decode_readdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
412 {
413 struct nfsd_readdirargs *args = rqstp->rq_argp;
414
415 if (!svcxdr_decode_fhandle(xdr, &args->fh))
416 return false;
417 if (xdr_stream_decode_u32(xdr, &args->cookie) < 0)
418 return false;
419 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
420 return false;
421
422 return true;
423 }
424
425 /*
426 * XDR encode functions
427 */
428
429 bool
nfssvc_encode_statres(struct svc_rqst * rqstp,struct xdr_stream * xdr)430 nfssvc_encode_statres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
431 {
432 struct nfsd_stat *resp = rqstp->rq_resp;
433
434 return svcxdr_encode_stat(xdr, resp->status);
435 }
436
437 bool
nfssvc_encode_attrstatres(struct svc_rqst * rqstp,struct xdr_stream * xdr)438 nfssvc_encode_attrstatres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
439 {
440 struct nfsd_attrstat *resp = rqstp->rq_resp;
441
442 if (!svcxdr_encode_stat(xdr, resp->status))
443 return false;
444 switch (resp->status) {
445 case nfs_ok:
446 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
447 return false;
448 break;
449 }
450
451 return true;
452 }
453
454 bool
nfssvc_encode_diropres(struct svc_rqst * rqstp,struct xdr_stream * xdr)455 nfssvc_encode_diropres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
456 {
457 struct nfsd_diropres *resp = rqstp->rq_resp;
458
459 if (!svcxdr_encode_stat(xdr, resp->status))
460 return false;
461 switch (resp->status) {
462 case nfs_ok:
463 if (!svcxdr_encode_fhandle(xdr, &resp->fh))
464 return false;
465 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
466 return false;
467 break;
468 }
469
470 return true;
471 }
472
473 bool
nfssvc_encode_readlinkres(struct svc_rqst * rqstp,struct xdr_stream * xdr)474 nfssvc_encode_readlinkres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
475 {
476 struct nfsd_readlinkres *resp = rqstp->rq_resp;
477 struct kvec *head = rqstp->rq_res.head;
478
479 if (!svcxdr_encode_stat(xdr, resp->status))
480 return false;
481 switch (resp->status) {
482 case nfs_ok:
483 if (xdr_stream_encode_u32(xdr, resp->len) < 0)
484 return false;
485 svcxdr_encode_opaque_pages(rqstp, xdr, &resp->page, 0,
486 resp->len);
487 if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0)
488 return false;
489 break;
490 }
491
492 return true;
493 }
494
495 bool
nfssvc_encode_readres(struct svc_rqst * rqstp,struct xdr_stream * xdr)496 nfssvc_encode_readres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
497 {
498 struct nfsd_readres *resp = rqstp->rq_resp;
499 struct kvec *head = rqstp->rq_res.head;
500
501 if (!svcxdr_encode_stat(xdr, resp->status))
502 return false;
503 switch (resp->status) {
504 case nfs_ok:
505 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
506 return false;
507 if (xdr_stream_encode_u32(xdr, resp->count) < 0)
508 return false;
509 svcxdr_encode_opaque_pages(rqstp, xdr, resp->pages,
510 rqstp->rq_res.page_base,
511 resp->count);
512 if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0)
513 return false;
514 break;
515 }
516
517 return true;
518 }
519
520 bool
nfssvc_encode_readdirres(struct svc_rqst * rqstp,struct xdr_stream * xdr)521 nfssvc_encode_readdirres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
522 {
523 struct nfsd_readdirres *resp = rqstp->rq_resp;
524 struct xdr_buf *dirlist = &resp->dirlist;
525
526 if (!svcxdr_encode_stat(xdr, resp->status))
527 return false;
528 switch (resp->status) {
529 case nfs_ok:
530 svcxdr_encode_opaque_pages(rqstp, xdr, dirlist->pages, 0,
531 dirlist->len);
532 /* no more entries */
533 if (xdr_stream_encode_item_absent(xdr) < 0)
534 return false;
535 if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
536 return false;
537 break;
538 }
539
540 return true;
541 }
542
543 bool
nfssvc_encode_statfsres(struct svc_rqst * rqstp,struct xdr_stream * xdr)544 nfssvc_encode_statfsres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
545 {
546 struct nfsd_statfsres *resp = rqstp->rq_resp;
547 struct kstatfs *stat = &resp->stats;
548 __be32 *p;
549
550 if (!svcxdr_encode_stat(xdr, resp->status))
551 return false;
552 switch (resp->status) {
553 case nfs_ok:
554 p = xdr_reserve_space(xdr, XDR_UNIT * 5);
555 if (!p)
556 return false;
557 *p++ = cpu_to_be32(NFS_MAXDATA);
558 *p++ = cpu_to_be32(stat->f_bsize);
559 *p++ = cpu_to_be32(stat->f_blocks);
560 *p++ = cpu_to_be32(stat->f_bfree);
561 *p = cpu_to_be32(stat->f_bavail);
562 break;
563 }
564
565 return true;
566 }
567
568 /**
569 * nfssvc_encode_nfscookie - Encode a directory offset cookie
570 * @resp: readdir result context
571 * @offset: offset cookie to encode
572 *
573 * The buffer space for the offset cookie has already been reserved
574 * by svcxdr_encode_entry_common().
575 */
nfssvc_encode_nfscookie(struct nfsd_readdirres * resp,u32 offset)576 void nfssvc_encode_nfscookie(struct nfsd_readdirres *resp, u32 offset)
577 {
578 __be32 cookie = cpu_to_be32(offset);
579
580 if (!resp->cookie_offset)
581 return;
582
583 write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie,
584 sizeof(cookie));
585 resp->cookie_offset = 0;
586 }
587
588 static bool
svcxdr_encode_entry_common(struct nfsd_readdirres * resp,const char * name,int namlen,loff_t offset,u64 ino)589 svcxdr_encode_entry_common(struct nfsd_readdirres *resp, const char *name,
590 int namlen, loff_t offset, u64 ino)
591 {
592 struct xdr_buf *dirlist = &resp->dirlist;
593 struct xdr_stream *xdr = &resp->xdr;
594
595 if (xdr_stream_encode_item_present(xdr) < 0)
596 return false;
597 /* fileid */
598 if (xdr_stream_encode_u32(xdr, (u32)ino) < 0)
599 return false;
600 /* name */
601 if (xdr_stream_encode_opaque(xdr, name, min(namlen, NFS2_MAXNAMLEN)) < 0)
602 return false;
603 /* cookie */
604 resp->cookie_offset = dirlist->len;
605 if (xdr_stream_encode_u32(xdr, ~0U) < 0)
606 return false;
607
608 return true;
609 }
610
611 /**
612 * nfssvc_encode_entry - encode one NFSv2 READDIR entry
613 * @data: directory context
614 * @name: name of the object to be encoded
615 * @namlen: length of that name, in bytes
616 * @offset: the offset of the previous entry
617 * @ino: the fileid of this entry
618 * @d_type: unused
619 *
620 * Return values:
621 * %0: Entry was successfully encoded.
622 * %-EINVAL: An encoding problem occurred, secondary status code in resp->common.err
623 *
624 * On exit, the following fields are updated:
625 * - resp->xdr
626 * - resp->common.err
627 * - resp->cookie_offset
628 */
nfssvc_encode_entry(void * data,const char * name,int namlen,loff_t offset,u64 ino,unsigned int d_type)629 int nfssvc_encode_entry(void *data, const char *name, int namlen,
630 loff_t offset, u64 ino, unsigned int d_type)
631 {
632 struct readdir_cd *ccd = data;
633 struct nfsd_readdirres *resp = container_of(ccd,
634 struct nfsd_readdirres,
635 common);
636 unsigned int starting_length = resp->dirlist.len;
637
638 /* The offset cookie for the previous entry */
639 nfssvc_encode_nfscookie(resp, offset);
640
641 if (!svcxdr_encode_entry_common(resp, name, namlen, offset, ino))
642 goto out_toosmall;
643
644 xdr_commit_encode(&resp->xdr);
645 resp->common.err = nfs_ok;
646 return 0;
647
648 out_toosmall:
649 resp->cookie_offset = 0;
650 resp->common.err = nfserr_toosmall;
651 resp->dirlist.len = starting_length;
652 return -EINVAL;
653 }
654
655 /*
656 * XDR release functions
657 */
nfssvc_release_attrstat(struct svc_rqst * rqstp)658 void nfssvc_release_attrstat(struct svc_rqst *rqstp)
659 {
660 struct nfsd_attrstat *resp = rqstp->rq_resp;
661
662 fh_put(&resp->fh);
663 }
664
nfssvc_release_diropres(struct svc_rqst * rqstp)665 void nfssvc_release_diropres(struct svc_rqst *rqstp)
666 {
667 struct nfsd_diropres *resp = rqstp->rq_resp;
668
669 fh_put(&resp->fh);
670 }
671
nfssvc_release_readres(struct svc_rqst * rqstp)672 void nfssvc_release_readres(struct svc_rqst *rqstp)
673 {
674 struct nfsd_readres *resp = rqstp->rq_resp;
675
676 fh_put(&resp->fh);
677 }
678