Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfsd/nfs3xdr.c | |
3 | * | |
4 | * XDR support for nfsd/protocol version 3. | |
5 | * | |
6 | * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> | |
7 | * | |
8 | * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()! | |
9 | */ | |
10 | ||
11 | #include <linux/types.h> | |
12 | #include <linux/time.h> | |
13 | #include <linux/nfs3.h> | |
14 | #include <linux/list.h> | |
15 | #include <linux/spinlock.h> | |
16 | #include <linux/dcache.h> | |
17 | #include <linux/namei.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/vfs.h> | |
20 | #include <linux/sunrpc/xdr.h> | |
21 | #include <linux/sunrpc/svc.h> | |
22 | #include <linux/nfsd/nfsd.h> | |
23 | #include <linux/nfsd/xdr3.h> | |
24 | ||
25 | #define NFSDDBG_FACILITY NFSDDBG_XDR | |
26 | ||
27 | #ifdef NFSD_OPTIMIZE_SPACE | |
28 | # define inline | |
29 | #endif | |
30 | ||
31 | ||
32 | /* | |
33 | * Mapping of S_IF* types to NFS file types | |
34 | */ | |
35 | static u32 nfs3_ftypes[] = { | |
36 | NF3NON, NF3FIFO, NF3CHR, NF3BAD, | |
37 | NF3DIR, NF3BAD, NF3BLK, NF3BAD, | |
38 | NF3REG, NF3BAD, NF3LNK, NF3BAD, | |
39 | NF3SOCK, NF3BAD, NF3LNK, NF3BAD, | |
40 | }; | |
41 | ||
42 | /* | |
43 | * XDR functions for basic NFS types | |
44 | */ | |
45 | static inline u32 * | |
46 | encode_time3(u32 *p, struct timespec *time) | |
47 | { | |
48 | *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec); | |
49 | return p; | |
50 | } | |
51 | ||
52 | static inline u32 * | |
53 | decode_time3(u32 *p, struct timespec *time) | |
54 | { | |
55 | time->tv_sec = ntohl(*p++); | |
56 | time->tv_nsec = ntohl(*p++); | |
57 | return p; | |
58 | } | |
59 | ||
60 | static inline u32 * | |
61 | decode_fh(u32 *p, struct svc_fh *fhp) | |
62 | { | |
63 | unsigned int size; | |
64 | fh_init(fhp, NFS3_FHSIZE); | |
65 | size = ntohl(*p++); | |
66 | if (size > NFS3_FHSIZE) | |
67 | return NULL; | |
68 | ||
69 | memcpy(&fhp->fh_handle.fh_base, p, size); | |
70 | fhp->fh_handle.fh_size = size; | |
71 | return p + XDR_QUADLEN(size); | |
72 | } | |
73 | ||
74 | static inline u32 * | |
75 | encode_fh(u32 *p, struct svc_fh *fhp) | |
76 | { | |
77 | unsigned int size = fhp->fh_handle.fh_size; | |
78 | *p++ = htonl(size); | |
79 | if (size) p[XDR_QUADLEN(size)-1]=0; | |
80 | memcpy(p, &fhp->fh_handle.fh_base, size); | |
81 | return p + XDR_QUADLEN(size); | |
82 | } | |
83 | ||
84 | /* | |
85 | * Decode a file name and make sure that the path contains | |
86 | * no slashes or null bytes. | |
87 | */ | |
88 | static inline u32 * | |
89 | decode_filename(u32 *p, char **namp, int *lenp) | |
90 | { | |
91 | char *name; | |
92 | int i; | |
93 | ||
94 | if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) { | |
95 | for (i = 0, name = *namp; i < *lenp; i++, name++) { | |
96 | if (*name == '\0' || *name == '/') | |
97 | return NULL; | |
98 | } | |
99 | } | |
100 | ||
101 | return p; | |
102 | } | |
103 | ||
104 | static inline u32 * | |
105 | decode_sattr3(u32 *p, struct iattr *iap) | |
106 | { | |
107 | u32 tmp; | |
108 | ||
109 | iap->ia_valid = 0; | |
110 | ||
111 | if (*p++) { | |
112 | iap->ia_valid |= ATTR_MODE; | |
113 | iap->ia_mode = ntohl(*p++); | |
114 | } | |
115 | if (*p++) { | |
116 | iap->ia_valid |= ATTR_UID; | |
117 | iap->ia_uid = ntohl(*p++); | |
118 | } | |
119 | if (*p++) { | |
120 | iap->ia_valid |= ATTR_GID; | |
121 | iap->ia_gid = ntohl(*p++); | |
122 | } | |
123 | if (*p++) { | |
124 | u64 newsize; | |
125 | ||
126 | iap->ia_valid |= ATTR_SIZE; | |
127 | p = xdr_decode_hyper(p, &newsize); | |
128 | if (newsize <= NFS_OFFSET_MAX) | |
129 | iap->ia_size = newsize; | |
130 | else | |
131 | iap->ia_size = NFS_OFFSET_MAX; | |
132 | } | |
133 | if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ | |
134 | iap->ia_valid |= ATTR_ATIME; | |
135 | } else if (tmp == 2) { /* set to client time */ | |
136 | iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; | |
137 | iap->ia_atime.tv_sec = ntohl(*p++); | |
138 | iap->ia_atime.tv_nsec = ntohl(*p++); | |
139 | } | |
140 | if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ | |
141 | iap->ia_valid |= ATTR_MTIME; | |
142 | } else if (tmp == 2) { /* set to client time */ | |
143 | iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; | |
144 | iap->ia_mtime.tv_sec = ntohl(*p++); | |
145 | iap->ia_mtime.tv_nsec = ntohl(*p++); | |
146 | } | |
147 | return p; | |
148 | } | |
149 | ||
150 | static inline u32 * | |
151 | encode_fattr3(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) | |
152 | { | |
153 | struct vfsmount *mnt = fhp->fh_export->ex_mnt; | |
154 | struct dentry *dentry = fhp->fh_dentry; | |
155 | struct kstat stat; | |
156 | struct timespec time; | |
157 | ||
158 | vfs_getattr(mnt, dentry, &stat); | |
159 | ||
160 | *p++ = htonl(nfs3_ftypes[(stat.mode & S_IFMT) >> 12]); | |
161 | *p++ = htonl((u32) stat.mode); | |
162 | *p++ = htonl((u32) stat.nlink); | |
163 | *p++ = htonl((u32) nfsd_ruid(rqstp, stat.uid)); | |
164 | *p++ = htonl((u32) nfsd_rgid(rqstp, stat.gid)); | |
165 | if (S_ISLNK(stat.mode) && stat.size > NFS3_MAXPATHLEN) { | |
166 | p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); | |
167 | } else { | |
168 | p = xdr_encode_hyper(p, (u64) stat.size); | |
169 | } | |
170 | p = xdr_encode_hyper(p, ((u64)stat.blocks) << 9); | |
171 | *p++ = htonl((u32) MAJOR(stat.rdev)); | |
172 | *p++ = htonl((u32) MINOR(stat.rdev)); | |
173 | if (is_fsid(fhp, rqstp->rq_reffh)) | |
174 | p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); | |
175 | else | |
176 | p = xdr_encode_hyper(p, (u64) huge_encode_dev(stat.dev)); | |
177 | p = xdr_encode_hyper(p, (u64) stat.ino); | |
178 | p = encode_time3(p, &stat.atime); | |
179 | lease_get_mtime(dentry->d_inode, &time); | |
180 | p = encode_time3(p, &time); | |
181 | p = encode_time3(p, &stat.ctime); | |
182 | ||
183 | return p; | |
184 | } | |
185 | ||
186 | static inline u32 * | |
187 | encode_saved_post_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) | |
188 | { | |
189 | struct inode *inode = fhp->fh_dentry->d_inode; | |
190 | ||
191 | /* Attributes to follow */ | |
192 | *p++ = xdr_one; | |
193 | ||
194 | *p++ = htonl(nfs3_ftypes[(fhp->fh_post_mode & S_IFMT) >> 12]); | |
195 | *p++ = htonl((u32) fhp->fh_post_mode); | |
196 | *p++ = htonl((u32) fhp->fh_post_nlink); | |
197 | *p++ = htonl((u32) nfsd_ruid(rqstp, fhp->fh_post_uid)); | |
198 | *p++ = htonl((u32) nfsd_rgid(rqstp, fhp->fh_post_gid)); | |
199 | if (S_ISLNK(fhp->fh_post_mode) && fhp->fh_post_size > NFS3_MAXPATHLEN) { | |
200 | p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); | |
201 | } else { | |
202 | p = xdr_encode_hyper(p, (u64) fhp->fh_post_size); | |
203 | } | |
204 | p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9); | |
205 | *p++ = fhp->fh_post_rdev[0]; | |
206 | *p++ = fhp->fh_post_rdev[1]; | |
207 | if (is_fsid(fhp, rqstp->rq_reffh)) | |
208 | p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); | |
209 | else | |
210 | p = xdr_encode_hyper(p, (u64)huge_encode_dev(inode->i_sb->s_dev)); | |
211 | p = xdr_encode_hyper(p, (u64) inode->i_ino); | |
212 | p = encode_time3(p, &fhp->fh_post_atime); | |
213 | p = encode_time3(p, &fhp->fh_post_mtime); | |
214 | p = encode_time3(p, &fhp->fh_post_ctime); | |
215 | ||
216 | return p; | |
217 | } | |
218 | ||
219 | /* | |
220 | * Encode post-operation attributes. | |
221 | * The inode may be NULL if the call failed because of a stale file | |
222 | * handle. In this case, no attributes are returned. | |
223 | */ | |
224 | static u32 * | |
225 | encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) | |
226 | { | |
227 | struct dentry *dentry = fhp->fh_dentry; | |
228 | if (dentry && dentry->d_inode != NULL) { | |
229 | *p++ = xdr_one; /* attributes follow */ | |
230 | return encode_fattr3(rqstp, p, fhp); | |
231 | } | |
232 | *p++ = xdr_zero; | |
233 | return p; | |
234 | } | |
235 | ||
236 | /* | |
237 | * Enocde weak cache consistency data | |
238 | */ | |
239 | static u32 * | |
240 | encode_wcc_data(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) | |
241 | { | |
242 | struct dentry *dentry = fhp->fh_dentry; | |
243 | ||
244 | if (dentry && dentry->d_inode && fhp->fh_post_saved) { | |
245 | if (fhp->fh_pre_saved) { | |
246 | *p++ = xdr_one; | |
247 | p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size); | |
248 | p = encode_time3(p, &fhp->fh_pre_mtime); | |
249 | p = encode_time3(p, &fhp->fh_pre_ctime); | |
250 | } else { | |
251 | *p++ = xdr_zero; | |
252 | } | |
253 | return encode_saved_post_attr(rqstp, p, fhp); | |
254 | } | |
255 | /* no pre- or post-attrs */ | |
256 | *p++ = xdr_zero; | |
257 | return encode_post_op_attr(rqstp, p, fhp); | |
258 | } | |
259 | ||
260 | ||
261 | /* | |
262 | * XDR decode functions | |
263 | */ | |
264 | int | |
265 | nfs3svc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct nfsd_fhandle *args) | |
266 | { | |
267 | if (!(p = decode_fh(p, &args->fh))) | |
268 | return 0; | |
269 | return xdr_argsize_check(rqstp, p); | |
270 | } | |
271 | ||
272 | int | |
273 | nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p, | |
274 | struct nfsd3_sattrargs *args) | |
275 | { | |
276 | if (!(p = decode_fh(p, &args->fh)) | |
277 | || !(p = decode_sattr3(p, &args->attrs))) | |
278 | return 0; | |
279 | ||
280 | if ((args->check_guard = ntohl(*p++)) != 0) { | |
281 | struct timespec time; | |
282 | p = decode_time3(p, &time); | |
283 | args->guardtime = time.tv_sec; | |
284 | } | |
285 | ||
286 | return xdr_argsize_check(rqstp, p); | |
287 | } | |
288 | ||
289 | int | |
290 | nfs3svc_decode_diropargs(struct svc_rqst *rqstp, u32 *p, | |
291 | struct nfsd3_diropargs *args) | |
292 | { | |
293 | if (!(p = decode_fh(p, &args->fh)) | |
294 | || !(p = decode_filename(p, &args->name, &args->len))) | |
295 | return 0; | |
296 | ||
297 | return xdr_argsize_check(rqstp, p); | |
298 | } | |
299 | ||
300 | int | |
301 | nfs3svc_decode_accessargs(struct svc_rqst *rqstp, u32 *p, | |
302 | struct nfsd3_accessargs *args) | |
303 | { | |
304 | if (!(p = decode_fh(p, &args->fh))) | |
305 | return 0; | |
306 | args->access = ntohl(*p++); | |
307 | ||
308 | return xdr_argsize_check(rqstp, p); | |
309 | } | |
310 | ||
311 | int | |
312 | nfs3svc_decode_readargs(struct svc_rqst *rqstp, u32 *p, | |
313 | struct nfsd3_readargs *args) | |
314 | { | |
315 | unsigned int len; | |
316 | int v,pn; | |
317 | ||
318 | if (!(p = decode_fh(p, &args->fh)) | |
319 | || !(p = xdr_decode_hyper(p, &args->offset))) | |
320 | return 0; | |
321 | ||
322 | len = args->count = ntohl(*p++); | |
323 | ||
324 | if (len > NFSSVC_MAXBLKSIZE) | |
325 | len = NFSSVC_MAXBLKSIZE; | |
326 | ||
327 | /* set up the kvec */ | |
328 | v=0; | |
329 | while (len > 0) { | |
330 | pn = rqstp->rq_resused; | |
331 | svc_take_page(rqstp); | |
332 | args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]); | |
333 | args->vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE; | |
334 | len -= args->vec[v].iov_len; | |
335 | v++; | |
336 | } | |
337 | args->vlen = v; | |
338 | return xdr_argsize_check(rqstp, p); | |
339 | } | |
340 | ||
341 | int | |
342 | nfs3svc_decode_writeargs(struct svc_rqst *rqstp, u32 *p, | |
343 | struct nfsd3_writeargs *args) | |
344 | { | |
345 | unsigned int len, v, hdr; | |
346 | ||
347 | if (!(p = decode_fh(p, &args->fh)) | |
348 | || !(p = xdr_decode_hyper(p, &args->offset))) | |
349 | return 0; | |
350 | ||
351 | args->count = ntohl(*p++); | |
352 | args->stable = ntohl(*p++); | |
353 | len = args->len = ntohl(*p++); | |
354 | ||
355 | hdr = (void*)p - rqstp->rq_arg.head[0].iov_base; | |
356 | if (rqstp->rq_arg.len < len + hdr) | |
357 | return 0; | |
358 | ||
359 | args->vec[0].iov_base = (void*)p; | |
360 | args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr; | |
361 | ||
362 | if (len > NFSSVC_MAXBLKSIZE) | |
363 | len = NFSSVC_MAXBLKSIZE; | |
364 | v= 0; | |
365 | while (len > args->vec[v].iov_len) { | |
366 | len -= args->vec[v].iov_len; | |
367 | v++; | |
368 | args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]); | |
369 | args->vec[v].iov_len = PAGE_SIZE; | |
370 | } | |
371 | args->vec[v].iov_len = len; | |
372 | args->vlen = v+1; | |
373 | ||
374 | return args->count == args->len && args->vec[0].iov_len > 0; | |
375 | } | |
376 | ||
377 | int | |
378 | nfs3svc_decode_createargs(struct svc_rqst *rqstp, u32 *p, | |
379 | struct nfsd3_createargs *args) | |
380 | { | |
381 | if (!(p = decode_fh(p, &args->fh)) | |
382 | || !(p = decode_filename(p, &args->name, &args->len))) | |
383 | return 0; | |
384 | ||
385 | switch (args->createmode = ntohl(*p++)) { | |
386 | case NFS3_CREATE_UNCHECKED: | |
387 | case NFS3_CREATE_GUARDED: | |
388 | if (!(p = decode_sattr3(p, &args->attrs))) | |
389 | return 0; | |
390 | break; | |
391 | case NFS3_CREATE_EXCLUSIVE: | |
392 | args->verf = p; | |
393 | p += 2; | |
394 | break; | |
395 | default: | |
396 | return 0; | |
397 | } | |
398 | ||
399 | return xdr_argsize_check(rqstp, p); | |
400 | } | |
401 | int | |
402 | nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, u32 *p, | |
403 | struct nfsd3_createargs *args) | |
404 | { | |
405 | if (!(p = decode_fh(p, &args->fh)) | |
406 | || !(p = decode_filename(p, &args->name, &args->len)) | |
407 | || !(p = decode_sattr3(p, &args->attrs))) | |
408 | return 0; | |
409 | ||
410 | return xdr_argsize_check(rqstp, p); | |
411 | } | |
412 | ||
413 | int | |
414 | nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p, | |
415 | struct nfsd3_symlinkargs *args) | |
416 | { | |
417 | unsigned int len; | |
418 | int avail; | |
419 | char *old, *new; | |
420 | struct kvec *vec; | |
421 | ||
422 | if (!(p = decode_fh(p, &args->ffh)) | |
423 | || !(p = decode_filename(p, &args->fname, &args->flen)) | |
424 | || !(p = decode_sattr3(p, &args->attrs)) | |
425 | ) | |
426 | return 0; | |
427 | /* now decode the pathname, which might be larger than the first page. | |
428 | * As we have to check for nul's anyway, we copy it into a new page | |
429 | * This page appears in the rq_res.pages list, but as pages_len is always | |
430 | * 0, it won't get in the way | |
431 | */ | |
432 | svc_take_page(rqstp); | |
433 | len = ntohl(*p++); | |
434 | if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE) | |
435 | return 0; | |
436 | args->tname = new = page_address(rqstp->rq_respages[rqstp->rq_resused-1]); | |
437 | args->tlen = len; | |
438 | /* first copy and check from the first page */ | |
439 | old = (char*)p; | |
440 | vec = &rqstp->rq_arg.head[0]; | |
441 | avail = vec->iov_len - (old - (char*)vec->iov_base); | |
442 | while (len && avail && *old) { | |
443 | *new++ = *old++; | |
444 | len--; | |
445 | avail--; | |
446 | } | |
447 | /* now copy next page if there is one */ | |
448 | if (len && !avail && rqstp->rq_arg.page_len) { | |
449 | avail = rqstp->rq_arg.page_len; | |
450 | if (avail > PAGE_SIZE) avail = PAGE_SIZE; | |
451 | old = page_address(rqstp->rq_arg.pages[0]); | |
452 | } | |
453 | while (len && avail && *old) { | |
454 | *new++ = *old++; | |
455 | len--; | |
456 | avail--; | |
457 | } | |
458 | *new = '\0'; | |
459 | if (len) | |
460 | return 0; | |
461 | ||
462 | return 1; | |
463 | } | |
464 | ||
465 | int | |
466 | nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, u32 *p, | |
467 | struct nfsd3_mknodargs *args) | |
468 | { | |
469 | if (!(p = decode_fh(p, &args->fh)) | |
470 | || !(p = decode_filename(p, &args->name, &args->len))) | |
471 | return 0; | |
472 | ||
473 | args->ftype = ntohl(*p++); | |
474 | ||
475 | if (args->ftype == NF3BLK || args->ftype == NF3CHR | |
476 | || args->ftype == NF3SOCK || args->ftype == NF3FIFO) { | |
477 | if (!(p = decode_sattr3(p, &args->attrs))) | |
478 | return 0; | |
479 | } | |
480 | ||
481 | if (args->ftype == NF3BLK || args->ftype == NF3CHR) { | |
482 | args->major = ntohl(*p++); | |
483 | args->minor = ntohl(*p++); | |
484 | } | |
485 | ||
486 | return xdr_argsize_check(rqstp, p); | |
487 | } | |
488 | ||
489 | int | |
490 | nfs3svc_decode_renameargs(struct svc_rqst *rqstp, u32 *p, | |
491 | struct nfsd3_renameargs *args) | |
492 | { | |
493 | if (!(p = decode_fh(p, &args->ffh)) | |
494 | || !(p = decode_filename(p, &args->fname, &args->flen)) | |
495 | || !(p = decode_fh(p, &args->tfh)) | |
496 | || !(p = decode_filename(p, &args->tname, &args->tlen))) | |
497 | return 0; | |
498 | ||
499 | return xdr_argsize_check(rqstp, p); | |
500 | } | |
501 | ||
502 | int | |
503 | nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p, | |
504 | struct nfsd3_readlinkargs *args) | |
505 | { | |
506 | if (!(p = decode_fh(p, &args->fh))) | |
507 | return 0; | |
508 | svc_take_page(rqstp); | |
509 | args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]); | |
510 | ||
511 | return xdr_argsize_check(rqstp, p); | |
512 | } | |
513 | ||
514 | int | |
515 | nfs3svc_decode_linkargs(struct svc_rqst *rqstp, u32 *p, | |
516 | struct nfsd3_linkargs *args) | |
517 | { | |
518 | if (!(p = decode_fh(p, &args->ffh)) | |
519 | || !(p = decode_fh(p, &args->tfh)) | |
520 | || !(p = decode_filename(p, &args->tname, &args->tlen))) | |
521 | return 0; | |
522 | ||
523 | return xdr_argsize_check(rqstp, p); | |
524 | } | |
525 | ||
526 | int | |
527 | nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p, | |
528 | struct nfsd3_readdirargs *args) | |
529 | { | |
530 | if (!(p = decode_fh(p, &args->fh))) | |
531 | return 0; | |
532 | p = xdr_decode_hyper(p, &args->cookie); | |
533 | args->verf = p; p += 2; | |
534 | args->dircount = ~0; | |
535 | args->count = ntohl(*p++); | |
536 | ||
537 | if (args->count > PAGE_SIZE) | |
538 | args->count = PAGE_SIZE; | |
539 | ||
540 | svc_take_page(rqstp); | |
541 | args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]); | |
542 | ||
543 | return xdr_argsize_check(rqstp, p); | |
544 | } | |
545 | ||
546 | int | |
547 | nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p, | |
548 | struct nfsd3_readdirargs *args) | |
549 | { | |
550 | int len, pn; | |
551 | ||
552 | if (!(p = decode_fh(p, &args->fh))) | |
553 | return 0; | |
554 | p = xdr_decode_hyper(p, &args->cookie); | |
555 | args->verf = p; p += 2; | |
556 | args->dircount = ntohl(*p++); | |
557 | args->count = ntohl(*p++); | |
558 | ||
559 | len = (args->count > NFSSVC_MAXBLKSIZE) ? NFSSVC_MAXBLKSIZE : | |
560 | args->count; | |
561 | args->count = len; | |
562 | ||
563 | while (len > 0) { | |
564 | pn = rqstp->rq_resused; | |
565 | svc_take_page(rqstp); | |
566 | if (!args->buffer) | |
567 | args->buffer = page_address(rqstp->rq_respages[pn]); | |
568 | len -= PAGE_SIZE; | |
569 | } | |
570 | ||
571 | return xdr_argsize_check(rqstp, p); | |
572 | } | |
573 | ||
574 | int | |
575 | nfs3svc_decode_commitargs(struct svc_rqst *rqstp, u32 *p, | |
576 | struct nfsd3_commitargs *args) | |
577 | { | |
578 | if (!(p = decode_fh(p, &args->fh))) | |
579 | return 0; | |
580 | p = xdr_decode_hyper(p, &args->offset); | |
581 | args->count = ntohl(*p++); | |
582 | ||
583 | return xdr_argsize_check(rqstp, p); | |
584 | } | |
585 | ||
586 | /* | |
587 | * XDR encode functions | |
588 | */ | |
589 | /* | |
590 | * There must be an encoding function for void results so svc_process | |
591 | * will work properly. | |
592 | */ | |
593 | int | |
594 | nfs3svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy) | |
595 | { | |
596 | return xdr_ressize_check(rqstp, p); | |
597 | } | |
598 | ||
599 | /* GETATTR */ | |
600 | int | |
601 | nfs3svc_encode_attrstat(struct svc_rqst *rqstp, u32 *p, | |
602 | struct nfsd3_attrstat *resp) | |
603 | { | |
604 | if (resp->status == 0) | |
605 | p = encode_fattr3(rqstp, p, &resp->fh); | |
606 | return xdr_ressize_check(rqstp, p); | |
607 | } | |
608 | ||
609 | /* SETATTR, REMOVE, RMDIR */ | |
610 | int | |
611 | nfs3svc_encode_wccstat(struct svc_rqst *rqstp, u32 *p, | |
612 | struct nfsd3_attrstat *resp) | |
613 | { | |
614 | p = encode_wcc_data(rqstp, p, &resp->fh); | |
615 | return xdr_ressize_check(rqstp, p); | |
616 | } | |
617 | ||
618 | /* LOOKUP */ | |
619 | int | |
620 | nfs3svc_encode_diropres(struct svc_rqst *rqstp, u32 *p, | |
621 | struct nfsd3_diropres *resp) | |
622 | { | |
623 | if (resp->status == 0) { | |
624 | p = encode_fh(p, &resp->fh); | |
625 | p = encode_post_op_attr(rqstp, p, &resp->fh); | |
626 | } | |
627 | p = encode_post_op_attr(rqstp, p, &resp->dirfh); | |
628 | return xdr_ressize_check(rqstp, p); | |
629 | } | |
630 | ||
631 | /* ACCESS */ | |
632 | int | |
633 | nfs3svc_encode_accessres(struct svc_rqst *rqstp, u32 *p, | |
634 | struct nfsd3_accessres *resp) | |
635 | { | |
636 | p = encode_post_op_attr(rqstp, p, &resp->fh); | |
637 | if (resp->status == 0) | |
638 | *p++ = htonl(resp->access); | |
639 | return xdr_ressize_check(rqstp, p); | |
640 | } | |
641 | ||
642 | /* READLINK */ | |
643 | int | |
644 | nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p, | |
645 | struct nfsd3_readlinkres *resp) | |
646 | { | |
647 | p = encode_post_op_attr(rqstp, p, &resp->fh); | |
648 | if (resp->status == 0) { | |
649 | *p++ = htonl(resp->len); | |
650 | xdr_ressize_check(rqstp, p); | |
651 | rqstp->rq_res.page_len = resp->len; | |
652 | if (resp->len & 3) { | |
653 | /* need to pad the tail */ | |
654 | rqstp->rq_restailpage = 0; | |
655 | rqstp->rq_res.tail[0].iov_base = p; | |
656 | *p = 0; | |
657 | rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3); | |
658 | } | |
659 | return 1; | |
660 | } else | |
661 | return xdr_ressize_check(rqstp, p); | |
662 | } | |
663 | ||
664 | /* READ */ | |
665 | int | |
666 | nfs3svc_encode_readres(struct svc_rqst *rqstp, u32 *p, | |
667 | struct nfsd3_readres *resp) | |
668 | { | |
669 | p = encode_post_op_attr(rqstp, p, &resp->fh); | |
670 | if (resp->status == 0) { | |
671 | *p++ = htonl(resp->count); | |
672 | *p++ = htonl(resp->eof); | |
673 | *p++ = htonl(resp->count); /* xdr opaque count */ | |
674 | xdr_ressize_check(rqstp, p); | |
675 | /* now update rqstp->rq_res to reflect data aswell */ | |
676 | rqstp->rq_res.page_len = resp->count; | |
677 | if (resp->count & 3) { | |
678 | /* need to pad the tail */ | |
679 | rqstp->rq_restailpage = 0; | |
680 | rqstp->rq_res.tail[0].iov_base = p; | |
681 | *p = 0; | |
682 | rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3); | |
683 | } | |
684 | return 1; | |
685 | } else | |
686 | return xdr_ressize_check(rqstp, p); | |
687 | } | |
688 | ||
689 | /* WRITE */ | |
690 | int | |
691 | nfs3svc_encode_writeres(struct svc_rqst *rqstp, u32 *p, | |
692 | struct nfsd3_writeres *resp) | |
693 | { | |
694 | p = encode_wcc_data(rqstp, p, &resp->fh); | |
695 | if (resp->status == 0) { | |
696 | *p++ = htonl(resp->count); | |
697 | *p++ = htonl(resp->committed); | |
698 | *p++ = htonl(nfssvc_boot.tv_sec); | |
699 | *p++ = htonl(nfssvc_boot.tv_usec); | |
700 | } | |
701 | return xdr_ressize_check(rqstp, p); | |
702 | } | |
703 | ||
704 | /* CREATE, MKDIR, SYMLINK, MKNOD */ | |
705 | int | |
706 | nfs3svc_encode_createres(struct svc_rqst *rqstp, u32 *p, | |
707 | struct nfsd3_diropres *resp) | |
708 | { | |
709 | if (resp->status == 0) { | |
710 | *p++ = xdr_one; | |
711 | p = encode_fh(p, &resp->fh); | |
712 | p = encode_post_op_attr(rqstp, p, &resp->fh); | |
713 | } | |
714 | p = encode_wcc_data(rqstp, p, &resp->dirfh); | |
715 | return xdr_ressize_check(rqstp, p); | |
716 | } | |
717 | ||
718 | /* RENAME */ | |
719 | int | |
720 | nfs3svc_encode_renameres(struct svc_rqst *rqstp, u32 *p, | |
721 | struct nfsd3_renameres *resp) | |
722 | { | |
723 | p = encode_wcc_data(rqstp, p, &resp->ffh); | |
724 | p = encode_wcc_data(rqstp, p, &resp->tfh); | |
725 | return xdr_ressize_check(rqstp, p); | |
726 | } | |
727 | ||
728 | /* LINK */ | |
729 | int | |
730 | nfs3svc_encode_linkres(struct svc_rqst *rqstp, u32 *p, | |
731 | struct nfsd3_linkres *resp) | |
732 | { | |
733 | p = encode_post_op_attr(rqstp, p, &resp->fh); | |
734 | p = encode_wcc_data(rqstp, p, &resp->tfh); | |
735 | return xdr_ressize_check(rqstp, p); | |
736 | } | |
737 | ||
738 | /* READDIR */ | |
739 | int | |
740 | nfs3svc_encode_readdirres(struct svc_rqst *rqstp, u32 *p, | |
741 | struct nfsd3_readdirres *resp) | |
742 | { | |
743 | p = encode_post_op_attr(rqstp, p, &resp->fh); | |
744 | ||
745 | if (resp->status == 0) { | |
746 | /* stupid readdir cookie */ | |
747 | memcpy(p, resp->verf, 8); p += 2; | |
748 | xdr_ressize_check(rqstp, p); | |
749 | if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE) | |
750 | return 1; /*No room for trailer */ | |
751 | rqstp->rq_res.page_len = (resp->count) << 2; | |
752 | ||
753 | /* add the 'tail' to the end of the 'head' page - page 0. */ | |
754 | rqstp->rq_restailpage = 0; | |
755 | rqstp->rq_res.tail[0].iov_base = p; | |
756 | *p++ = 0; /* no more entries */ | |
757 | *p++ = htonl(resp->common.err == nfserr_eof); | |
758 | rqstp->rq_res.tail[0].iov_len = 2<<2; | |
759 | return 1; | |
760 | } else | |
761 | return xdr_ressize_check(rqstp, p); | |
762 | } | |
763 | ||
764 | static inline u32 * | |
765 | encode_entry_baggage(struct nfsd3_readdirres *cd, u32 *p, const char *name, | |
766 | int namlen, ino_t ino) | |
767 | { | |
768 | *p++ = xdr_one; /* mark entry present */ | |
769 | p = xdr_encode_hyper(p, ino); /* file id */ | |
770 | p = xdr_encode_array(p, name, namlen);/* name length & name */ | |
771 | ||
772 | cd->offset = p; /* remember pointer */ | |
773 | p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */ | |
774 | ||
775 | return p; | |
776 | } | |
777 | ||
778 | static inline u32 * | |
779 | encode_entryplus_baggage(struct nfsd3_readdirres *cd, u32 *p, | |
780 | struct svc_fh *fhp) | |
781 | { | |
782 | p = encode_post_op_attr(cd->rqstp, p, fhp); | |
783 | *p++ = xdr_one; /* yes, a file handle follows */ | |
784 | p = encode_fh(p, fhp); | |
785 | fh_put(fhp); | |
786 | return p; | |
787 | } | |
788 | ||
789 | static int | |
790 | compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, | |
791 | const char *name, int namlen) | |
792 | { | |
793 | struct svc_export *exp; | |
794 | struct dentry *dparent, *dchild; | |
795 | int rv = 0; | |
796 | ||
797 | dparent = cd->fh.fh_dentry; | |
798 | exp = cd->fh.fh_export; | |
799 | ||
800 | fh_init(fhp, NFS3_FHSIZE); | |
801 | if (isdotent(name, namlen)) { | |
802 | if (namlen == 2) { | |
803 | dchild = dget_parent(dparent); | |
804 | if (dchild == dparent) { | |
805 | /* filesystem root - cannot return filehandle for ".." */ | |
806 | dput(dchild); | |
807 | return 1; | |
808 | } | |
809 | } else | |
810 | dchild = dget(dparent); | |
811 | } else | |
812 | dchild = lookup_one_len(name, dparent, namlen); | |
813 | if (IS_ERR(dchild)) | |
814 | return 1; | |
815 | if (d_mountpoint(dchild) || | |
816 | fh_compose(fhp, exp, dchild, &cd->fh) != 0 || | |
817 | !dchild->d_inode) | |
818 | rv = 1; | |
819 | dput(dchild); | |
820 | return rv; | |
821 | } | |
822 | ||
823 | /* | |
824 | * Encode a directory entry. This one works for both normal readdir | |
825 | * and readdirplus. | |
826 | * The normal readdir reply requires 2 (fileid) + 1 (stringlen) | |
827 | * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen. | |
828 | * | |
829 | * The readdirplus baggage is 1+21 words for post_op_attr, plus the | |
830 | * file handle. | |
831 | */ | |
832 | ||
833 | #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1) | |
834 | #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2)) | |
835 | static int | |
836 | encode_entry(struct readdir_cd *ccd, const char *name, | |
837 | int namlen, off_t offset, ino_t ino, unsigned int d_type, int plus) | |
838 | { | |
839 | struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres, | |
840 | common); | |
841 | u32 *p = cd->buffer; | |
842 | caddr_t curr_page_addr = NULL; | |
843 | int pn; /* current page number */ | |
844 | int slen; /* string (name) length */ | |
845 | int elen; /* estimated entry length in words */ | |
846 | int num_entry_words = 0; /* actual number of words */ | |
847 | ||
848 | if (cd->offset) { | |
849 | u64 offset64 = offset; | |
850 | ||
851 | if (unlikely(cd->offset1)) { | |
852 | /* we ended up with offset on a page boundary */ | |
853 | *cd->offset = htonl(offset64 >> 32); | |
854 | *cd->offset1 = htonl(offset64 & 0xffffffff); | |
855 | cd->offset1 = NULL; | |
856 | } else { | |
857 | xdr_encode_hyper(cd->offset, (u64) offset); | |
858 | } | |
859 | } | |
860 | ||
861 | /* | |
862 | dprintk("encode_entry(%.*s @%ld%s)\n", | |
863 | namlen, name, (long) offset, plus? " plus" : ""); | |
864 | */ | |
865 | ||
866 | /* truncate filename if too long */ | |
867 | if (namlen > NFS3_MAXNAMLEN) | |
868 | namlen = NFS3_MAXNAMLEN; | |
869 | ||
870 | slen = XDR_QUADLEN(namlen); | |
871 | elen = slen + NFS3_ENTRY_BAGGAGE | |
872 | + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0); | |
873 | ||
874 | if (cd->buflen < elen) { | |
875 | cd->common.err = nfserr_toosmall; | |
876 | return -EINVAL; | |
877 | } | |
878 | ||
879 | /* determine which page in rq_respages[] we are currently filling */ | |
880 | for (pn=1; pn < cd->rqstp->rq_resused; pn++) { | |
881 | curr_page_addr = page_address(cd->rqstp->rq_respages[pn]); | |
882 | ||
883 | if (((caddr_t)cd->buffer >= curr_page_addr) && | |
884 | ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE)) | |
885 | break; | |
886 | } | |
887 | ||
888 | if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) { | |
889 | /* encode entry in current page */ | |
890 | ||
891 | p = encode_entry_baggage(cd, p, name, namlen, ino); | |
892 | ||
893 | /* throw in readdirplus baggage */ | |
894 | if (plus) { | |
895 | struct svc_fh fh; | |
896 | ||
897 | if (compose_entry_fh(cd, &fh, name, namlen) > 0) { | |
898 | *p++ = 0; | |
899 | *p++ = 0; | |
900 | } else | |
901 | p = encode_entryplus_baggage(cd, p, &fh); | |
902 | } | |
903 | num_entry_words = p - cd->buffer; | |
904 | } else if (cd->rqstp->rq_respages[pn+1] != NULL) { | |
905 | /* temporarily encode entry into next page, then move back to | |
906 | * current and next page in rq_respages[] */ | |
907 | u32 *p1, *tmp; | |
908 | int len1, len2; | |
909 | ||
910 | /* grab next page for temporary storage of entry */ | |
911 | p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]); | |
912 | ||
913 | p1 = encode_entry_baggage(cd, p1, name, namlen, ino); | |
914 | ||
915 | /* throw in readdirplus baggage */ | |
916 | if (plus) { | |
917 | struct svc_fh fh; | |
918 | ||
919 | if (compose_entry_fh(cd, &fh, name, namlen) > 0) { | |
920 | /* zero out the filehandle */ | |
921 | *p1++ = 0; | |
922 | *p1++ = 0; | |
923 | } else | |
924 | p1 = encode_entryplus_baggage(cd, p1, &fh); | |
925 | } | |
926 | ||
927 | /* determine entry word length and lengths to go in pages */ | |
928 | num_entry_words = p1 - tmp; | |
929 | len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer; | |
930 | if ((num_entry_words << 2) < len1) { | |
931 | /* the actual number of words in the entry is less | |
932 | * than elen and can still fit in the current page | |
933 | */ | |
934 | memmove(p, tmp, num_entry_words << 2); | |
935 | p += num_entry_words; | |
936 | ||
937 | /* update offset */ | |
938 | cd->offset = cd->buffer + (cd->offset - tmp); | |
939 | } else { | |
940 | unsigned int offset_r = (cd->offset - tmp) << 2; | |
941 | ||
942 | /* update pointer to offset location. | |
943 | * This is a 64bit quantity, so we need to | |
944 | * deal with 3 cases: | |
945 | * - entirely in first page | |
946 | * - entirely in second page | |
947 | * - 4 bytes in each page | |
948 | */ | |
949 | if (offset_r + 8 <= len1) { | |
950 | cd->offset = p + (cd->offset - tmp); | |
951 | } else if (offset_r >= len1) { | |
952 | cd->offset -= len1 >> 2; | |
953 | } else { | |
954 | /* sitting on the fence */ | |
955 | BUG_ON(offset_r != len1 - 4); | |
956 | cd->offset = p + (cd->offset - tmp); | |
957 | cd->offset1 = tmp; | |
958 | } | |
959 | ||
960 | len2 = (num_entry_words << 2) - len1; | |
961 | ||
962 | /* move from temp page to current and next pages */ | |
963 | memmove(p, tmp, len1); | |
964 | memmove(tmp, (caddr_t)tmp+len1, len2); | |
965 | ||
966 | p = tmp + (len2 >> 2); | |
967 | } | |
968 | } | |
969 | else { | |
970 | cd->common.err = nfserr_toosmall; | |
971 | return -EINVAL; | |
972 | } | |
973 | ||
974 | cd->buflen -= num_entry_words; | |
975 | cd->buffer = p; | |
976 | cd->common.err = nfs_ok; | |
977 | return 0; | |
978 | ||
979 | } | |
980 | ||
981 | int | |
982 | nfs3svc_encode_entry(struct readdir_cd *cd, const char *name, | |
983 | int namlen, loff_t offset, ino_t ino, unsigned int d_type) | |
984 | { | |
985 | return encode_entry(cd, name, namlen, offset, ino, d_type, 0); | |
986 | } | |
987 | ||
988 | int | |
989 | nfs3svc_encode_entry_plus(struct readdir_cd *cd, const char *name, | |
990 | int namlen, loff_t offset, ino_t ino, unsigned int d_type) | |
991 | { | |
992 | return encode_entry(cd, name, namlen, offset, ino, d_type, 1); | |
993 | } | |
994 | ||
995 | /* FSSTAT */ | |
996 | int | |
997 | nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, u32 *p, | |
998 | struct nfsd3_fsstatres *resp) | |
999 | { | |
1000 | struct kstatfs *s = &resp->stats; | |
1001 | u64 bs = s->f_bsize; | |
1002 | ||
1003 | *p++ = xdr_zero; /* no post_op_attr */ | |
1004 | ||
1005 | if (resp->status == 0) { | |
1006 | p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */ | |
1007 | p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */ | |
1008 | p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */ | |
1009 | p = xdr_encode_hyper(p, s->f_files); /* total inodes */ | |
1010 | p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */ | |
1011 | p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */ | |
1012 | *p++ = htonl(resp->invarsec); /* mean unchanged time */ | |
1013 | } | |
1014 | return xdr_ressize_check(rqstp, p); | |
1015 | } | |
1016 | ||
1017 | /* FSINFO */ | |
1018 | int | |
1019 | nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, u32 *p, | |
1020 | struct nfsd3_fsinfores *resp) | |
1021 | { | |
1022 | *p++ = xdr_zero; /* no post_op_attr */ | |
1023 | ||
1024 | if (resp->status == 0) { | |
1025 | *p++ = htonl(resp->f_rtmax); | |
1026 | *p++ = htonl(resp->f_rtpref); | |
1027 | *p++ = htonl(resp->f_rtmult); | |
1028 | *p++ = htonl(resp->f_wtmax); | |
1029 | *p++ = htonl(resp->f_wtpref); | |
1030 | *p++ = htonl(resp->f_wtmult); | |
1031 | *p++ = htonl(resp->f_dtpref); | |
1032 | p = xdr_encode_hyper(p, resp->f_maxfilesize); | |
1033 | *p++ = xdr_one; | |
1034 | *p++ = xdr_zero; | |
1035 | *p++ = htonl(resp->f_properties); | |
1036 | } | |
1037 | ||
1038 | return xdr_ressize_check(rqstp, p); | |
1039 | } | |
1040 | ||
1041 | /* PATHCONF */ | |
1042 | int | |
1043 | nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, u32 *p, | |
1044 | struct nfsd3_pathconfres *resp) | |
1045 | { | |
1046 | *p++ = xdr_zero; /* no post_op_attr */ | |
1047 | ||
1048 | if (resp->status == 0) { | |
1049 | *p++ = htonl(resp->p_link_max); | |
1050 | *p++ = htonl(resp->p_name_max); | |
1051 | *p++ = htonl(resp->p_no_trunc); | |
1052 | *p++ = htonl(resp->p_chown_restricted); | |
1053 | *p++ = htonl(resp->p_case_insensitive); | |
1054 | *p++ = htonl(resp->p_case_preserving); | |
1055 | } | |
1056 | ||
1057 | return xdr_ressize_check(rqstp, p); | |
1058 | } | |
1059 | ||
1060 | /* COMMIT */ | |
1061 | int | |
1062 | nfs3svc_encode_commitres(struct svc_rqst *rqstp, u32 *p, | |
1063 | struct nfsd3_commitres *resp) | |
1064 | { | |
1065 | p = encode_wcc_data(rqstp, p, &resp->fh); | |
1066 | /* Write verifier */ | |
1067 | if (resp->status == 0) { | |
1068 | *p++ = htonl(nfssvc_boot.tv_sec); | |
1069 | *p++ = htonl(nfssvc_boot.tv_usec); | |
1070 | } | |
1071 | return xdr_ressize_check(rqstp, p); | |
1072 | } | |
1073 | ||
1074 | /* | |
1075 | * XDR release functions | |
1076 | */ | |
1077 | int | |
1078 | nfs3svc_release_fhandle(struct svc_rqst *rqstp, u32 *p, | |
1079 | struct nfsd3_attrstat *resp) | |
1080 | { | |
1081 | fh_put(&resp->fh); | |
1082 | return 1; | |
1083 | } | |
1084 | ||
1085 | int | |
1086 | nfs3svc_release_fhandle2(struct svc_rqst *rqstp, u32 *p, | |
1087 | struct nfsd3_fhandle_pair *resp) | |
1088 | { | |
1089 | fh_put(&resp->fh1); | |
1090 | fh_put(&resp->fh2); | |
1091 | return 1; | |
1092 | } |