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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * XDR support for nfsd |
4 | * | |
5 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
6 | */ | |
7 | ||
3dadecce | 8 | #include "vfs.h" |
9a74af21 | 9 | #include "xdr.h" |
2e8138a2 | 10 | #include "auth.h" |
1da177e4 | 11 | |
1da177e4 LT |
12 | /* |
13 | * Mapping of S_IF* types to NFS file types | |
14 | */ | |
92b54a4f | 15 | static const u32 nfs_ftypes[] = { |
1da177e4 LT |
16 | NFNON, NFCHR, NFCHR, NFBAD, |
17 | NFDIR, NFBAD, NFBLK, NFBAD, | |
18 | NFREG, NFBAD, NFLNK, NFBAD, | |
19 | NFSOCK, NFBAD, NFLNK, NFBAD, | |
20 | }; | |
21 | ||
22 | ||
23 | /* | |
ebcd8e8b | 24 | * Basic NFSv2 data types (RFC 1094 Section 2.3) |
1da177e4 | 25 | */ |
ebcd8e8b | 26 | |
f8cba473 CL |
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 | |
a887eaed CL |
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 | ||
635a45d3 CL |
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 | |
ebcd8e8b CL |
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 | ||
e3b4ef22 CL |
73 | static bool |
74 | svcxdr_encode_fhandle(struct xdr_stream *xdr, const struct svc_fh *fhp) | |
1da177e4 | 75 | { |
e3b4ef22 CL |
76 | __be32 *p; |
77 | ||
78 | p = xdr_reserve_space(xdr, NFS_FHSIZE); | |
79 | if (!p) | |
80 | return false; | |
1da177e4 | 81 | memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE); |
e3b4ef22 CL |
82 | |
83 | return true; | |
1da177e4 LT |
84 | } |
85 | ||
92b54a4f CL |
86 | static __be32 * |
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 | ||
6d742c18 CL |
97 | static bool |
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 | |
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 | ||
2fdd6bd2 CL |
129 | static bool |
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 | ||
f8cba473 CL |
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 | |
92b54a4f CL |
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) | |
e3b4ef22 | 226 | return false; |
92b54a4f CL |
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 | ||
e3b4ef22 | 268 | return true; |
92b54a4f CL |
269 | } |
270 | ||
1da177e4 LT |
271 | /* |
272 | * XDR decode functions | |
273 | */ | |
1da177e4 LT |
274 | |
275 | int | |
ebcd8e8b | 276 | nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 277 | { |
ebcd8e8b | 278 | struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
026fec7e CH |
279 | struct nfsd_fhandle *args = rqstp->rq_argp; |
280 | ||
ebcd8e8b | 281 | return svcxdr_decode_fhandle(xdr, &args->fh); |
1da177e4 LT |
282 | } |
283 | ||
284 | int | |
026fec7e | 285 | nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 286 | { |
2fdd6bd2 | 287 | struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
026fec7e CH |
288 | struct nfsd_sattrargs *args = rqstp->rq_argp; |
289 | ||
2fdd6bd2 CL |
290 | return svcxdr_decode_fhandle(xdr, &args->fh) && |
291 | svcxdr_decode_sattr(rqstp, xdr, &args->attrs); | |
1da177e4 LT |
292 | } |
293 | ||
294 | int | |
026fec7e | 295 | nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 296 | { |
6d742c18 | 297 | struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
026fec7e CH |
298 | struct nfsd_diropargs *args = rqstp->rq_argp; |
299 | ||
6d742c18 | 300 | return svcxdr_decode_diropargs(xdr, &args->fh, &args->name, &args->len); |
1da177e4 LT |
301 | } |
302 | ||
303 | int | |
026fec7e | 304 | nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 305 | { |
8c293ef9 | 306 | struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
026fec7e | 307 | struct nfsd_readargs *args = rqstp->rq_argp; |
8c293ef9 | 308 | u32 totalcount; |
1da177e4 | 309 | |
8c293ef9 CL |
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; | |
1da177e4 | 319 | |
8c293ef9 | 320 | return 1; |
1da177e4 LT |
321 | } |
322 | ||
323 | int | |
026fec7e | 324 | nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 325 | { |
a51b5b73 | 326 | struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
026fec7e | 327 | struct nfsd_writeargs *args = rqstp->rq_argp; |
db44bac4 | 328 | struct kvec *head = rqstp->rq_arg.head; |
a51b5b73 CL |
329 | struct kvec *tail = rqstp->rq_arg.tail; |
330 | u32 beginoffset, totalcount; | |
331 | size_t remaining; | |
f34b9568 | 332 | |
a51b5b73 | 333 | if (!svcxdr_decode_fhandle(xdr, &args->fh)) |
1da177e4 | 334 | return 0; |
a51b5b73 CL |
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) | |
f34b9568 PS |
342 | return 0; |
343 | ||
a51b5b73 CL |
344 | /* opaque data */ |
345 | if (xdr_stream_decode_u32(xdr, &args->len) < 0) | |
13bf9fbf | 346 | return 0; |
a51b5b73 CL |
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)) | |
f34b9568 | 352 | return 0; |
a51b5b73 CL |
353 | args->first.iov_base = xdr->p; |
354 | args->first.iov_len = head->iov_len - xdr_stream_pos(xdr); | |
f34b9568 | 355 | |
f34b9568 | 356 | return 1; |
1da177e4 LT |
357 | } |
358 | ||
359 | int | |
026fec7e | 360 | nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 361 | { |
7dcf65b9 | 362 | struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
026fec7e CH |
363 | struct nfsd_createargs *args = rqstp->rq_argp; |
364 | ||
7dcf65b9 CL |
365 | return svcxdr_decode_diropargs(xdr, &args->fh, |
366 | &args->name, &args->len) && | |
367 | svcxdr_decode_sattr(rqstp, xdr, &args->attrs); | |
1da177e4 LT |
368 | } |
369 | ||
370 | int | |
026fec7e | 371 | nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 372 | { |
62aa557e | 373 | struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
026fec7e CH |
374 | struct nfsd_renameargs *args = rqstp->rq_argp; |
375 | ||
62aa557e CL |
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); | |
1da177e4 LT |
380 | } |
381 | ||
382 | int | |
026fec7e | 383 | nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 384 | { |
77edcdf9 | 385 | struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
026fec7e CH |
386 | struct nfsd_linkargs *args = rqstp->rq_argp; |
387 | ||
77edcdf9 CL |
388 | return svcxdr_decode_fhandle(xdr, &args->ffh) && |
389 | svcxdr_decode_diropargs(xdr, &args->tfh, | |
390 | &args->tname, &args->tlen); | |
1da177e4 LT |
391 | } |
392 | ||
393 | int | |
026fec7e | 394 | nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 395 | { |
09f75a53 | 396 | struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
026fec7e | 397 | struct nfsd_symlinkargs *args = rqstp->rq_argp; |
09f75a53 | 398 | struct kvec *head = rqstp->rq_arg.head; |
026fec7e | 399 | |
09f75a53 CL |
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) | |
1da177e4 | 403 | return 0; |
38a70315 CL |
404 | if (args->tlen == 0) |
405 | return 0; | |
406 | ||
09f75a53 CL |
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); | |
1da177e4 LT |
412 | } |
413 | ||
414 | int | |
026fec7e | 415 | nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 416 | { |
8688361a | 417 | struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
026fec7e CH |
418 | struct nfsd_readdirargs *args = rqstp->rq_argp; |
419 | ||
8688361a CL |
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) | |
1da177e4 | 425 | return 0; |
1da177e4 | 426 | |
8688361a | 427 | return 1; |
1da177e4 LT |
428 | } |
429 | ||
430 | /* | |
431 | * XDR encode functions | |
432 | */ | |
1da177e4 | 433 | |
cc028a10 | 434 | int |
a887eaed | 435 | nfssvc_encode_statres(struct svc_rqst *rqstp, __be32 *p) |
cc028a10 | 436 | { |
a887eaed | 437 | struct xdr_stream *xdr = &rqstp->rq_res_stream; |
cc028a10 CL |
438 | struct nfsd_stat *resp = rqstp->rq_resp; |
439 | ||
a887eaed | 440 | return svcxdr_encode_stat(xdr, resp->status); |
cc028a10 CL |
441 | } |
442 | ||
1da177e4 | 443 | int |
92b54a4f | 444 | nfssvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 445 | { |
92b54a4f | 446 | struct xdr_stream *xdr = &rqstp->rq_res_stream; |
63f8de37 CH |
447 | struct nfsd_attrstat *resp = rqstp->rq_resp; |
448 | ||
92b54a4f CL |
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; | |
1da177e4 LT |
459 | } |
460 | ||
461 | int | |
63f8de37 | 462 | nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 463 | { |
e3b4ef22 | 464 | struct xdr_stream *xdr = &rqstp->rq_res_stream; |
63f8de37 CH |
465 | struct nfsd_diropres *resp = rqstp->rq_resp; |
466 | ||
e3b4ef22 CL |
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; | |
1da177e4 LT |
479 | } |
480 | ||
481 | int | |
63f8de37 | 482 | nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 483 | { |
d9014b0f | 484 | struct xdr_stream *xdr = &rqstp->rq_res_stream; |
63f8de37 | 485 | struct nfsd_readlinkres *resp = rqstp->rq_resp; |
76e5492b | 486 | struct kvec *head = rqstp->rq_res.head; |
63f8de37 | 487 | |
d9014b0f | 488 | if (!svcxdr_encode_stat(xdr, resp->status)) |
76e5492b | 489 | return 0; |
d9014b0f CL |
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 | ||
1da177e4 LT |
500 | return 1; |
501 | } | |
502 | ||
503 | int | |
63f8de37 | 504 | nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 505 | { |
a6f8d9dc | 506 | struct xdr_stream *xdr = &rqstp->rq_res_stream; |
63f8de37 | 507 | struct nfsd_readres *resp = rqstp->rq_resp; |
76e5492b | 508 | struct kvec *head = rqstp->rq_res.head; |
63f8de37 | 509 | |
a6f8d9dc | 510 | if (!svcxdr_encode_stat(xdr, resp->status)) |
76e5492b | 511 | return 0; |
a6f8d9dc CL |
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 | ||
1da177e4 LT |
525 | return 1; |
526 | } | |
527 | ||
528 | int | |
63f8de37 | 529 | nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 530 | { |
94c8f8c6 | 531 | struct xdr_stream *xdr = &rqstp->rq_res_stream; |
63f8de37 | 532 | struct nfsd_readdirres *resp = rqstp->rq_resp; |
f5dcccd6 | 533 | struct xdr_buf *dirlist = &resp->dirlist; |
63f8de37 | 534 | |
94c8f8c6 CL |
535 | if (!svcxdr_encode_stat(xdr, resp->status)) |
536 | return 0; | |
537 | switch (resp->status) { | |
538 | case nfs_ok: | |
f5dcccd6 | 539 | xdr_write_pages(xdr, dirlist->pages, 0, dirlist->len); |
94c8f8c6 CL |
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 | } | |
1da177e4 LT |
547 | |
548 | return 1; | |
549 | } | |
550 | ||
551 | int | |
63f8de37 | 552 | nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 553 | { |
bf15229f | 554 | struct xdr_stream *xdr = &rqstp->rq_res_stream; |
63f8de37 | 555 | struct nfsd_statfsres *resp = rqstp->rq_resp; |
1da177e4 LT |
556 | struct kstatfs *stat = &resp->stats; |
557 | ||
bf15229f CL |
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 | } | |
f0af2210 | 572 | |
bf15229f | 573 | return 1; |
1da177e4 LT |
574 | } |
575 | ||
d5253200 CL |
576 | /** |
577 | * nfssvc_encode_nfscookie - Encode a directory offset cookie | |
578 | * @resp: readdir result context | |
579 | * @offset: offset cookie to encode | |
580 | * | |
f5dcccd6 CL |
581 | * The buffer space for the offset cookie has already been reserved |
582 | * by svcxdr_encode_entry_common(). | |
d5253200 CL |
583 | */ |
584 | void nfssvc_encode_nfscookie(struct nfsd_readdirres *resp, u32 offset) | |
585 | { | |
f5dcccd6 CL |
586 | __be32 cookie = cpu_to_be32(offset); |
587 | ||
588 | if (!resp->cookie_offset) | |
d5253200 CL |
589 | return; |
590 | ||
f5dcccd6 CL |
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 | |
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 | /** | |
8a2cf9f5 | 620 | * nfssvc_encode_entry - encode one NFSv2 READDIR entry |
f5dcccd6 CL |
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 | */ | |
8a2cf9f5 CL |
637 | int nfssvc_encode_entry(void *data, const char *name, int namlen, |
638 | loff_t offset, u64 ino, unsigned int d_type) | |
f5dcccd6 CL |
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; | |
d5253200 CL |
661 | } |
662 | ||
1da177e4 LT |
663 | /* |
664 | * XDR release functions | |
665 | */ | |
1841b9b6 | 666 | void nfssvc_release_attrstat(struct svc_rqst *rqstp) |
1da177e4 | 667 | { |
1841b9b6 CL |
668 | struct nfsd_attrstat *resp = rqstp->rq_resp; |
669 | ||
670 | fh_put(&resp->fh); | |
671 | } | |
672 | ||
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 | ||
680 | void nfssvc_release_readres(struct svc_rqst *rqstp) | |
681 | { | |
682 | struct nfsd_readres *resp = rqstp->rq_resp; | |
8537488b | 683 | |
1da177e4 | 684 | fh_put(&resp->fh); |
1da177e4 | 685 | } |