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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 | #include "auth.h" |
25 | |
26 | #define NFSDDBG_FACILITY NFSDDBG_XDR |
27 | |
28 | |
29 | /* |
30 | * Mapping of S_IF* types to NFS file types |
31 | */ |
32 | static u32 nfs3_ftypes[] = { |
33 | NF3NON, NF3FIFO, NF3CHR, NF3BAD, |
34 | NF3DIR, NF3BAD, NF3BLK, NF3BAD, |
35 | NF3REG, NF3BAD, NF3LNK, NF3BAD, |
36 | NF3SOCK, NF3BAD, NF3LNK, NF3BAD, |
37 | }; |
38 | |
39 | /* |
40 | * XDR functions for basic NFS types |
41 | */ |
42 | static __be32 * |
43 | encode_time3(__be32 *p, struct timespec *time) |
44 | { |
45 | *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec); |
46 | return p; |
47 | } |
48 | |
49 | static __be32 * |
50 | decode_time3(__be32 *p, struct timespec *time) |
51 | { |
52 | time->tv_sec = ntohl(*p++); |
53 | time->tv_nsec = ntohl(*p++); |
54 | return p; |
55 | } |
56 | |
57 | static __be32 * |
58 | decode_fh(__be32 *p, struct svc_fh *fhp) |
59 | { |
60 | unsigned int size; |
61 | fh_init(fhp, NFS3_FHSIZE); |
62 | size = ntohl(*p++); |
63 | if (size > NFS3_FHSIZE) |
64 | return NULL; |
65 | |
66 | memcpy(&fhp->fh_handle.fh_base, p, size); |
67 | fhp->fh_handle.fh_size = size; |
68 | return p + XDR_QUADLEN(size); |
69 | } |
70 | |
71 | /* Helper function for NFSv3 ACL code */ |
72 | __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp) |
73 | { |
74 | return decode_fh(p, fhp); |
75 | } |
76 | |
77 | static __be32 * |
78 | encode_fh(__be32 *p, struct svc_fh *fhp) |
79 | { |
80 | unsigned int size = fhp->fh_handle.fh_size; |
81 | *p++ = htonl(size); |
82 | if (size) p[XDR_QUADLEN(size)-1]=0; |
83 | memcpy(p, &fhp->fh_handle.fh_base, size); |
84 | return p + XDR_QUADLEN(size); |
85 | } |
86 | |
87 | /* |
88 | * Decode a file name and make sure that the path contains |
89 | * no slashes or null bytes. |
90 | */ |
91 | static __be32 * |
92 | decode_filename(__be32 *p, char **namp, unsigned int *lenp) |
93 | { |
94 | char *name; |
95 | unsigned int i; |
96 | |
97 | if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) { |
98 | for (i = 0, name = *namp; i < *lenp; i++, name++) { |
99 | if (*name == '\0' || *name == '/') |
100 | return NULL; |
101 | } |
102 | } |
103 | |
104 | return p; |
105 | } |
106 | |
107 | static __be32 * |
108 | decode_sattr3(__be32 *p, struct iattr *iap) |
109 | { |
110 | u32 tmp; |
111 | |
112 | iap->ia_valid = 0; |
113 | |
114 | if (*p++) { |
115 | iap->ia_valid |= ATTR_MODE; |
116 | iap->ia_mode = ntohl(*p++); |
117 | } |
118 | if (*p++) { |
119 | iap->ia_valid |= ATTR_UID; |
120 | iap->ia_uid = ntohl(*p++); |
121 | } |
122 | if (*p++) { |
123 | iap->ia_valid |= ATTR_GID; |
124 | iap->ia_gid = ntohl(*p++); |
125 | } |
126 | if (*p++) { |
127 | u64 newsize; |
128 | |
129 | iap->ia_valid |= ATTR_SIZE; |
130 | p = xdr_decode_hyper(p, &newsize); |
131 | if (newsize <= NFS_OFFSET_MAX) |
132 | iap->ia_size = newsize; |
133 | else |
134 | iap->ia_size = NFS_OFFSET_MAX; |
135 | } |
136 | if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ |
137 | iap->ia_valid |= ATTR_ATIME; |
138 | } else if (tmp == 2) { /* set to client time */ |
139 | iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; |
140 | iap->ia_atime.tv_sec = ntohl(*p++); |
141 | iap->ia_atime.tv_nsec = ntohl(*p++); |
142 | } |
143 | if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ |
144 | iap->ia_valid |= ATTR_MTIME; |
145 | } else if (tmp == 2) { /* set to client time */ |
146 | iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; |
147 | iap->ia_mtime.tv_sec = ntohl(*p++); |
148 | iap->ia_mtime.tv_nsec = ntohl(*p++); |
149 | } |
150 | return p; |
151 | } |
152 | |
153 | static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp) |
154 | { |
155 | u64 f; |
156 | switch(fsid_source(fhp)) { |
157 | default: |
158 | case FSIDSOURCE_DEV: |
159 | p = xdr_encode_hyper(p, (u64)huge_encode_dev |
160 | (fhp->fh_dentry->d_inode->i_sb->s_dev)); |
161 | break; |
162 | case FSIDSOURCE_FSID: |
163 | p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); |
164 | break; |
165 | case FSIDSOURCE_UUID: |
166 | f = ((u64*)fhp->fh_export->ex_uuid)[0]; |
167 | f ^= ((u64*)fhp->fh_export->ex_uuid)[1]; |
168 | p = xdr_encode_hyper(p, f); |
169 | break; |
170 | } |
171 | return p; |
172 | } |
173 | |
174 | static __be32 * |
175 | encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, |
176 | struct kstat *stat) |
177 | { |
178 | *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]); |
179 | *p++ = htonl((u32) stat->mode); |
180 | *p++ = htonl((u32) stat->nlink); |
181 | *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid)); |
182 | *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid)); |
183 | if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) { |
184 | p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); |
185 | } else { |
186 | p = xdr_encode_hyper(p, (u64) stat->size); |
187 | } |
188 | p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9); |
189 | *p++ = htonl((u32) MAJOR(stat->rdev)); |
190 | *p++ = htonl((u32) MINOR(stat->rdev)); |
191 | p = encode_fsid(p, fhp); |
192 | p = xdr_encode_hyper(p, stat->ino); |
193 | p = encode_time3(p, &stat->atime); |
194 | p = encode_time3(p, &stat->mtime); |
195 | p = encode_time3(p, &stat->ctime); |
196 | |
197 | return p; |
198 | } |
199 | |
200 | static __be32 * |
201 | encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) |
202 | { |
203 | /* Attributes to follow */ |
204 | *p++ = xdr_one; |
205 | return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr); |
206 | } |
207 | |
208 | /* |
209 | * Encode post-operation attributes. |
210 | * The inode may be NULL if the call failed because of a stale file |
211 | * handle. In this case, no attributes are returned. |
212 | */ |
213 | static __be32 * |
214 | encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) |
215 | { |
216 | struct dentry *dentry = fhp->fh_dentry; |
217 | if (dentry && dentry->d_inode) { |
218 | int err; |
219 | struct kstat stat; |
220 | |
221 | err = vfs_getattr(fhp->fh_export->ex_path.mnt, dentry, &stat); |
222 | if (!err) { |
223 | *p++ = xdr_one; /* attributes follow */ |
224 | lease_get_mtime(dentry->d_inode, &stat.mtime); |
225 | return encode_fattr3(rqstp, p, fhp, &stat); |
226 | } |
227 | } |
228 | *p++ = xdr_zero; |
229 | return p; |
230 | } |
231 | |
232 | /* Helper for NFSv3 ACLs */ |
233 | __be32 * |
234 | nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) |
235 | { |
236 | return encode_post_op_attr(rqstp, p, fhp); |
237 | } |
238 | |
239 | /* |
240 | * Enocde weak cache consistency data |
241 | */ |
242 | static __be32 * |
243 | encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) |
244 | { |
245 | struct dentry *dentry = fhp->fh_dentry; |
246 | |
247 | if (dentry && dentry->d_inode && fhp->fh_post_saved) { |
248 | if (fhp->fh_pre_saved) { |
249 | *p++ = xdr_one; |
250 | p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size); |
251 | p = encode_time3(p, &fhp->fh_pre_mtime); |
252 | p = encode_time3(p, &fhp->fh_pre_ctime); |
253 | } else { |
254 | *p++ = xdr_zero; |
255 | } |
256 | return encode_saved_post_attr(rqstp, p, fhp); |
257 | } |
258 | /* no pre- or post-attrs */ |
259 | *p++ = xdr_zero; |
260 | return encode_post_op_attr(rqstp, p, fhp); |
261 | } |
262 | |
263 | /* |
264 | * Fill in the post_op attr for the wcc data |
265 | */ |
266 | void fill_post_wcc(struct svc_fh *fhp) |
267 | { |
268 | int err; |
269 | |
270 | if (fhp->fh_post_saved) |
271 | printk("nfsd: inode locked twice during operation.\n"); |
272 | |
273 | err = vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry, |
274 | &fhp->fh_post_attr); |
275 | fhp->fh_post_change = fhp->fh_dentry->d_inode->i_version; |
276 | if (err) |
277 | fhp->fh_post_saved = 0; |
278 | else |
279 | fhp->fh_post_saved = 1; |
280 | } |
281 | |
282 | /* |
283 | * XDR decode functions |
284 | */ |
285 | int |
286 | nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args) |
287 | { |
288 | if (!(p = decode_fh(p, &args->fh))) |
289 | return 0; |
290 | return xdr_argsize_check(rqstp, p); |
291 | } |
292 | |
293 | int |
294 | nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p, |
295 | struct nfsd3_sattrargs *args) |
296 | { |
297 | if (!(p = decode_fh(p, &args->fh))) |
298 | return 0; |
299 | p = decode_sattr3(p, &args->attrs); |
300 | |
301 | if ((args->check_guard = ntohl(*p++)) != 0) { |
302 | struct timespec time; |
303 | p = decode_time3(p, &time); |
304 | args->guardtime = time.tv_sec; |
305 | } |
306 | |
307 | return xdr_argsize_check(rqstp, p); |
308 | } |
309 | |
310 | int |
311 | nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p, |
312 | struct nfsd3_diropargs *args) |
313 | { |
314 | if (!(p = decode_fh(p, &args->fh)) |
315 | || !(p = decode_filename(p, &args->name, &args->len))) |
316 | return 0; |
317 | |
318 | return xdr_argsize_check(rqstp, p); |
319 | } |
320 | |
321 | int |
322 | nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p, |
323 | struct nfsd3_accessargs *args) |
324 | { |
325 | if (!(p = decode_fh(p, &args->fh))) |
326 | return 0; |
327 | args->access = ntohl(*p++); |
328 | |
329 | return xdr_argsize_check(rqstp, p); |
330 | } |
331 | |
332 | int |
333 | nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p, |
334 | struct nfsd3_readargs *args) |
335 | { |
336 | unsigned int len; |
337 | int v,pn; |
338 | u32 max_blocksize = svc_max_payload(rqstp); |
339 | |
340 | if (!(p = decode_fh(p, &args->fh))) |
341 | return 0; |
342 | p = xdr_decode_hyper(p, &args->offset); |
343 | |
344 | len = args->count = ntohl(*p++); |
345 | |
346 | if (len > max_blocksize) |
347 | len = max_blocksize; |
348 | |
349 | /* set up the kvec */ |
350 | v=0; |
351 | while (len > 0) { |
352 | pn = rqstp->rq_resused++; |
353 | rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]); |
354 | rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE; |
355 | len -= rqstp->rq_vec[v].iov_len; |
356 | v++; |
357 | } |
358 | args->vlen = v; |
359 | return xdr_argsize_check(rqstp, p); |
360 | } |
361 | |
362 | int |
363 | nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p, |
364 | struct nfsd3_writeargs *args) |
365 | { |
366 | unsigned int len, v, hdr, dlen; |
367 | u32 max_blocksize = svc_max_payload(rqstp); |
368 | |
369 | if (!(p = decode_fh(p, &args->fh))) |
370 | return 0; |
371 | p = xdr_decode_hyper(p, &args->offset); |
372 | |
373 | args->count = ntohl(*p++); |
374 | args->stable = ntohl(*p++); |
375 | len = args->len = ntohl(*p++); |
376 | /* |
377 | * The count must equal the amount of data passed. |
378 | */ |
379 | if (args->count != args->len) |
380 | return 0; |
381 | |
382 | /* |
383 | * Check to make sure that we got the right number of |
384 | * bytes. |
385 | */ |
386 | hdr = (void*)p - rqstp->rq_arg.head[0].iov_base; |
387 | dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len |
388 | - hdr; |
389 | /* |
390 | * Round the length of the data which was specified up to |
391 | * the next multiple of XDR units and then compare that |
392 | * against the length which was actually received. |
393 | * Note that when RPCSEC/GSS (for example) is used, the |
394 | * data buffer can be padded so dlen might be larger |
395 | * than required. It must never be smaller. |
396 | */ |
397 | if (dlen < XDR_QUADLEN(len)*4) |
398 | return 0; |
399 | |
400 | if (args->count > max_blocksize) { |
401 | args->count = max_blocksize; |
402 | len = args->len = max_blocksize; |
403 | } |
404 | rqstp->rq_vec[0].iov_base = (void*)p; |
405 | rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr; |
406 | v = 0; |
407 | while (len > rqstp->rq_vec[v].iov_len) { |
408 | len -= rqstp->rq_vec[v].iov_len; |
409 | v++; |
410 | rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]); |
411 | rqstp->rq_vec[v].iov_len = PAGE_SIZE; |
412 | } |
413 | rqstp->rq_vec[v].iov_len = len; |
414 | args->vlen = v + 1; |
415 | return 1; |
416 | } |
417 | |
418 | int |
419 | nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p, |
420 | struct nfsd3_createargs *args) |
421 | { |
422 | if (!(p = decode_fh(p, &args->fh)) |
423 | || !(p = decode_filename(p, &args->name, &args->len))) |
424 | return 0; |
425 | |
426 | switch (args->createmode = ntohl(*p++)) { |
427 | case NFS3_CREATE_UNCHECKED: |
428 | case NFS3_CREATE_GUARDED: |
429 | p = decode_sattr3(p, &args->attrs); |
430 | break; |
431 | case NFS3_CREATE_EXCLUSIVE: |
432 | args->verf = p; |
433 | p += 2; |
434 | break; |
435 | default: |
436 | return 0; |
437 | } |
438 | |
439 | return xdr_argsize_check(rqstp, p); |
440 | } |
441 | int |
442 | nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p, |
443 | struct nfsd3_createargs *args) |
444 | { |
445 | if (!(p = decode_fh(p, &args->fh)) || |
446 | !(p = decode_filename(p, &args->name, &args->len))) |
447 | return 0; |
448 | p = decode_sattr3(p, &args->attrs); |
449 | |
450 | return xdr_argsize_check(rqstp, p); |
451 | } |
452 | |
453 | int |
454 | nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p, |
455 | struct nfsd3_symlinkargs *args) |
456 | { |
457 | unsigned int len, avail; |
458 | char *old, *new; |
459 | struct kvec *vec; |
460 | |
461 | if (!(p = decode_fh(p, &args->ffh)) || |
462 | !(p = decode_filename(p, &args->fname, &args->flen)) |
463 | ) |
464 | return 0; |
465 | p = decode_sattr3(p, &args->attrs); |
466 | |
467 | /* now decode the pathname, which might be larger than the first page. |
468 | * As we have to check for nul's anyway, we copy it into a new page |
469 | * This page appears in the rq_res.pages list, but as pages_len is always |
470 | * 0, it won't get in the way |
471 | */ |
472 | len = ntohl(*p++); |
473 | if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE) |
474 | return 0; |
475 | args->tname = new = |
476 | page_address(rqstp->rq_respages[rqstp->rq_resused++]); |
477 | args->tlen = len; |
478 | /* first copy and check from the first page */ |
479 | old = (char*)p; |
480 | vec = &rqstp->rq_arg.head[0]; |
481 | avail = vec->iov_len - (old - (char*)vec->iov_base); |
482 | while (len && avail && *old) { |
483 | *new++ = *old++; |
484 | len--; |
485 | avail--; |
486 | } |
487 | /* now copy next page if there is one */ |
488 | if (len && !avail && rqstp->rq_arg.page_len) { |
489 | avail = rqstp->rq_arg.page_len; |
490 | if (avail > PAGE_SIZE) |
491 | avail = PAGE_SIZE; |
492 | old = page_address(rqstp->rq_arg.pages[0]); |
493 | } |
494 | while (len && avail && *old) { |
495 | *new++ = *old++; |
496 | len--; |
497 | avail--; |
498 | } |
499 | *new = '\0'; |
500 | if (len) |
501 | return 0; |
502 | |
503 | return 1; |
504 | } |
505 | |
506 | int |
507 | nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p, |
508 | struct nfsd3_mknodargs *args) |
509 | { |
510 | if (!(p = decode_fh(p, &args->fh)) |
511 | || !(p = decode_filename(p, &args->name, &args->len))) |
512 | return 0; |
513 | |
514 | args->ftype = ntohl(*p++); |
515 | |
516 | if (args->ftype == NF3BLK || args->ftype == NF3CHR |
517 | || args->ftype == NF3SOCK || args->ftype == NF3FIFO) |
518 | p = decode_sattr3(p, &args->attrs); |
519 | |
520 | if (args->ftype == NF3BLK || args->ftype == NF3CHR) { |
521 | args->major = ntohl(*p++); |
522 | args->minor = ntohl(*p++); |
523 | } |
524 | |
525 | return xdr_argsize_check(rqstp, p); |
526 | } |
527 | |
528 | int |
529 | nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p, |
530 | struct nfsd3_renameargs *args) |
531 | { |
532 | if (!(p = decode_fh(p, &args->ffh)) |
533 | || !(p = decode_filename(p, &args->fname, &args->flen)) |
534 | || !(p = decode_fh(p, &args->tfh)) |
535 | || !(p = decode_filename(p, &args->tname, &args->tlen))) |
536 | return 0; |
537 | |
538 | return xdr_argsize_check(rqstp, p); |
539 | } |
540 | |
541 | int |
542 | nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, |
543 | struct nfsd3_readlinkargs *args) |
544 | { |
545 | if (!(p = decode_fh(p, &args->fh))) |
546 | return 0; |
547 | args->buffer = |
548 | page_address(rqstp->rq_respages[rqstp->rq_resused++]); |
549 | |
550 | return xdr_argsize_check(rqstp, p); |
551 | } |
552 | |
553 | int |
554 | nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p, |
555 | struct nfsd3_linkargs *args) |
556 | { |
557 | if (!(p = decode_fh(p, &args->ffh)) |
558 | || !(p = decode_fh(p, &args->tfh)) |
559 | || !(p = decode_filename(p, &args->tname, &args->tlen))) |
560 | return 0; |
561 | |
562 | return xdr_argsize_check(rqstp, p); |
563 | } |
564 | |
565 | int |
566 | nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p, |
567 | struct nfsd3_readdirargs *args) |
568 | { |
569 | if (!(p = decode_fh(p, &args->fh))) |
570 | return 0; |
571 | p = xdr_decode_hyper(p, &args->cookie); |
572 | args->verf = p; p += 2; |
573 | args->dircount = ~0; |
574 | args->count = ntohl(*p++); |
575 | |
576 | if (args->count > PAGE_SIZE) |
577 | args->count = PAGE_SIZE; |
578 | |
579 | args->buffer = |
580 | page_address(rqstp->rq_respages[rqstp->rq_resused++]); |
581 | |
582 | return xdr_argsize_check(rqstp, p); |
583 | } |
584 | |
585 | int |
586 | nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p, |
587 | struct nfsd3_readdirargs *args) |
588 | { |
589 | int len, pn; |
590 | u32 max_blocksize = svc_max_payload(rqstp); |
591 | |
592 | if (!(p = decode_fh(p, &args->fh))) |
593 | return 0; |
594 | p = xdr_decode_hyper(p, &args->cookie); |
595 | args->verf = p; p += 2; |
596 | args->dircount = ntohl(*p++); |
597 | args->count = ntohl(*p++); |
598 | |
599 | len = (args->count > max_blocksize) ? max_blocksize : |
600 | args->count; |
601 | args->count = len; |
602 | |
603 | while (len > 0) { |
604 | pn = rqstp->rq_resused++; |
605 | if (!args->buffer) |
606 | args->buffer = page_address(rqstp->rq_respages[pn]); |
607 | len -= PAGE_SIZE; |
608 | } |
609 | |
610 | return xdr_argsize_check(rqstp, p); |
611 | } |
612 | |
613 | int |
614 | nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p, |
615 | struct nfsd3_commitargs *args) |
616 | { |
617 | if (!(p = decode_fh(p, &args->fh))) |
618 | return 0; |
619 | p = xdr_decode_hyper(p, &args->offset); |
620 | args->count = ntohl(*p++); |
621 | |
622 | return xdr_argsize_check(rqstp, p); |
623 | } |
624 | |
625 | /* |
626 | * XDR encode functions |
627 | */ |
628 | /* |
629 | * There must be an encoding function for void results so svc_process |
630 | * will work properly. |
631 | */ |
632 | int |
633 | nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy) |
634 | { |
635 | return xdr_ressize_check(rqstp, p); |
636 | } |
637 | |
638 | /* GETATTR */ |
639 | int |
640 | nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p, |
641 | struct nfsd3_attrstat *resp) |
642 | { |
643 | if (resp->status == 0) { |
644 | lease_get_mtime(resp->fh.fh_dentry->d_inode, |
645 | &resp->stat.mtime); |
646 | p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat); |
647 | } |
648 | return xdr_ressize_check(rqstp, p); |
649 | } |
650 | |
651 | /* SETATTR, REMOVE, RMDIR */ |
652 | int |
653 | nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p, |
654 | struct nfsd3_attrstat *resp) |
655 | { |
656 | p = encode_wcc_data(rqstp, p, &resp->fh); |
657 | return xdr_ressize_check(rqstp, p); |
658 | } |
659 | |
660 | /* LOOKUP */ |
661 | int |
662 | nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p, |
663 | struct nfsd3_diropres *resp) |
664 | { |
665 | if (resp->status == 0) { |
666 | p = encode_fh(p, &resp->fh); |
667 | p = encode_post_op_attr(rqstp, p, &resp->fh); |
668 | } |
669 | p = encode_post_op_attr(rqstp, p, &resp->dirfh); |
670 | return xdr_ressize_check(rqstp, p); |
671 | } |
672 | |
673 | /* ACCESS */ |
674 | int |
675 | nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p, |
676 | struct nfsd3_accessres *resp) |
677 | { |
678 | p = encode_post_op_attr(rqstp, p, &resp->fh); |
679 | if (resp->status == 0) |
680 | *p++ = htonl(resp->access); |
681 | return xdr_ressize_check(rqstp, p); |
682 | } |
683 | |
684 | /* READLINK */ |
685 | int |
686 | nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p, |
687 | struct nfsd3_readlinkres *resp) |
688 | { |
689 | p = encode_post_op_attr(rqstp, p, &resp->fh); |
690 | if (resp->status == 0) { |
691 | *p++ = htonl(resp->len); |
692 | xdr_ressize_check(rqstp, p); |
693 | rqstp->rq_res.page_len = resp->len; |
694 | if (resp->len & 3) { |
695 | /* need to pad the tail */ |
696 | rqstp->rq_res.tail[0].iov_base = p; |
697 | *p = 0; |
698 | rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3); |
699 | } |
700 | return 1; |
701 | } else |
702 | return xdr_ressize_check(rqstp, p); |
703 | } |
704 | |
705 | /* READ */ |
706 | int |
707 | nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p, |
708 | struct nfsd3_readres *resp) |
709 | { |
710 | p = encode_post_op_attr(rqstp, p, &resp->fh); |
711 | if (resp->status == 0) { |
712 | *p++ = htonl(resp->count); |
713 | *p++ = htonl(resp->eof); |
714 | *p++ = htonl(resp->count); /* xdr opaque count */ |
715 | xdr_ressize_check(rqstp, p); |
716 | /* now update rqstp->rq_res to reflect data aswell */ |
717 | rqstp->rq_res.page_len = resp->count; |
718 | if (resp->count & 3) { |
719 | /* need to pad the tail */ |
720 | rqstp->rq_res.tail[0].iov_base = p; |
721 | *p = 0; |
722 | rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3); |
723 | } |
724 | return 1; |
725 | } else |
726 | return xdr_ressize_check(rqstp, p); |
727 | } |
728 | |
729 | /* WRITE */ |
730 | int |
731 | nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p, |
732 | struct nfsd3_writeres *resp) |
733 | { |
734 | p = encode_wcc_data(rqstp, p, &resp->fh); |
735 | if (resp->status == 0) { |
736 | *p++ = htonl(resp->count); |
737 | *p++ = htonl(resp->committed); |
738 | *p++ = htonl(nfssvc_boot.tv_sec); |
739 | *p++ = htonl(nfssvc_boot.tv_usec); |
740 | } |
741 | return xdr_ressize_check(rqstp, p); |
742 | } |
743 | |
744 | /* CREATE, MKDIR, SYMLINK, MKNOD */ |
745 | int |
746 | nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p, |
747 | struct nfsd3_diropres *resp) |
748 | { |
749 | if (resp->status == 0) { |
750 | *p++ = xdr_one; |
751 | p = encode_fh(p, &resp->fh); |
752 | p = encode_post_op_attr(rqstp, p, &resp->fh); |
753 | } |
754 | p = encode_wcc_data(rqstp, p, &resp->dirfh); |
755 | return xdr_ressize_check(rqstp, p); |
756 | } |
757 | |
758 | /* RENAME */ |
759 | int |
760 | nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p, |
761 | struct nfsd3_renameres *resp) |
762 | { |
763 | p = encode_wcc_data(rqstp, p, &resp->ffh); |
764 | p = encode_wcc_data(rqstp, p, &resp->tfh); |
765 | return xdr_ressize_check(rqstp, p); |
766 | } |
767 | |
768 | /* LINK */ |
769 | int |
770 | nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p, |
771 | struct nfsd3_linkres *resp) |
772 | { |
773 | p = encode_post_op_attr(rqstp, p, &resp->fh); |
774 | p = encode_wcc_data(rqstp, p, &resp->tfh); |
775 | return xdr_ressize_check(rqstp, p); |
776 | } |
777 | |
778 | /* READDIR */ |
779 | int |
780 | nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p, |
781 | struct nfsd3_readdirres *resp) |
782 | { |
783 | p = encode_post_op_attr(rqstp, p, &resp->fh); |
784 | |
785 | if (resp->status == 0) { |
786 | /* stupid readdir cookie */ |
787 | memcpy(p, resp->verf, 8); p += 2; |
788 | xdr_ressize_check(rqstp, p); |
789 | if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE) |
790 | return 1; /*No room for trailer */ |
791 | rqstp->rq_res.page_len = (resp->count) << 2; |
792 | |
793 | /* add the 'tail' to the end of the 'head' page - page 0. */ |
794 | rqstp->rq_res.tail[0].iov_base = p; |
795 | *p++ = 0; /* no more entries */ |
796 | *p++ = htonl(resp->common.err == nfserr_eof); |
797 | rqstp->rq_res.tail[0].iov_len = 2<<2; |
798 | return 1; |
799 | } else |
800 | return xdr_ressize_check(rqstp, p); |
801 | } |
802 | |
803 | static __be32 * |
804 | encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, |
805 | int namlen, u64 ino) |
806 | { |
807 | *p++ = xdr_one; /* mark entry present */ |
808 | p = xdr_encode_hyper(p, ino); /* file id */ |
809 | p = xdr_encode_array(p, name, namlen);/* name length & name */ |
810 | |
811 | cd->offset = p; /* remember pointer */ |
812 | p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */ |
813 | |
814 | return p; |
815 | } |
816 | |
817 | static __be32 * |
818 | encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, |
819 | struct svc_fh *fhp) |
820 | { |
821 | p = encode_post_op_attr(cd->rqstp, p, fhp); |
822 | *p++ = xdr_one; /* yes, a file handle follows */ |
823 | p = encode_fh(p, fhp); |
824 | fh_put(fhp); |
825 | return p; |
826 | } |
827 | |
828 | static int |
829 | compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, |
830 | const char *name, int namlen) |
831 | { |
832 | struct svc_export *exp; |
833 | struct dentry *dparent, *dchild; |
834 | int rv = 0; |
835 | |
836 | dparent = cd->fh.fh_dentry; |
837 | exp = cd->fh.fh_export; |
838 | |
839 | fh_init(fhp, NFS3_FHSIZE); |
840 | if (isdotent(name, namlen)) { |
841 | if (namlen == 2) { |
842 | dchild = dget_parent(dparent); |
843 | if (dchild == dparent) { |
844 | /* filesystem root - cannot return filehandle for ".." */ |
845 | dput(dchild); |
846 | return 1; |
847 | } |
848 | } else |
849 | dchild = dget(dparent); |
850 | } else |
851 | dchild = lookup_one_len(name, dparent, namlen); |
852 | if (IS_ERR(dchild)) |
853 | return 1; |
854 | if (d_mountpoint(dchild) || |
855 | fh_compose(fhp, exp, dchild, &cd->fh) != 0 || |
856 | !dchild->d_inode) |
857 | rv = 1; |
858 | dput(dchild); |
859 | return rv; |
860 | } |
861 | |
862 | /* |
863 | * Encode a directory entry. This one works for both normal readdir |
864 | * and readdirplus. |
865 | * The normal readdir reply requires 2 (fileid) + 1 (stringlen) |
866 | * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen. |
867 | * |
868 | * The readdirplus baggage is 1+21 words for post_op_attr, plus the |
869 | * file handle. |
870 | */ |
871 | |
872 | #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1) |
873 | #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2)) |
874 | static int |
875 | encode_entry(struct readdir_cd *ccd, const char *name, int namlen, |
876 | loff_t offset, u64 ino, unsigned int d_type, int plus) |
877 | { |
878 | struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres, |
879 | common); |
880 | __be32 *p = cd->buffer; |
881 | caddr_t curr_page_addr = NULL; |
882 | int pn; /* current page number */ |
883 | int slen; /* string (name) length */ |
884 | int elen; /* estimated entry length in words */ |
885 | int num_entry_words = 0; /* actual number of words */ |
886 | |
887 | if (cd->offset) { |
888 | u64 offset64 = offset; |
889 | |
890 | if (unlikely(cd->offset1)) { |
891 | /* we ended up with offset on a page boundary */ |
892 | *cd->offset = htonl(offset64 >> 32); |
893 | *cd->offset1 = htonl(offset64 & 0xffffffff); |
894 | cd->offset1 = NULL; |
895 | } else { |
896 | xdr_encode_hyper(cd->offset, offset64); |
897 | } |
898 | } |
899 | |
900 | /* |
901 | dprintk("encode_entry(%.*s @%ld%s)\n", |
902 | namlen, name, (long) offset, plus? " plus" : ""); |
903 | */ |
904 | |
905 | /* truncate filename if too long */ |
906 | if (namlen > NFS3_MAXNAMLEN) |
907 | namlen = NFS3_MAXNAMLEN; |
908 | |
909 | slen = XDR_QUADLEN(namlen); |
910 | elen = slen + NFS3_ENTRY_BAGGAGE |
911 | + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0); |
912 | |
913 | if (cd->buflen < elen) { |
914 | cd->common.err = nfserr_toosmall; |
915 | return -EINVAL; |
916 | } |
917 | |
918 | /* determine which page in rq_respages[] we are currently filling */ |
919 | for (pn=1; pn < cd->rqstp->rq_resused; pn++) { |
920 | curr_page_addr = page_address(cd->rqstp->rq_respages[pn]); |
921 | |
922 | if (((caddr_t)cd->buffer >= curr_page_addr) && |
923 | ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE)) |
924 | break; |
925 | } |
926 | |
927 | if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) { |
928 | /* encode entry in current page */ |
929 | |
930 | p = encode_entry_baggage(cd, p, name, namlen, ino); |
931 | |
932 | /* throw in readdirplus baggage */ |
933 | if (plus) { |
934 | struct svc_fh fh; |
935 | |
936 | if (compose_entry_fh(cd, &fh, name, namlen) > 0) { |
937 | *p++ = 0; |
938 | *p++ = 0; |
939 | } else |
940 | p = encode_entryplus_baggage(cd, p, &fh); |
941 | } |
942 | num_entry_words = p - cd->buffer; |
943 | } else if (cd->rqstp->rq_respages[pn+1] != NULL) { |
944 | /* temporarily encode entry into next page, then move back to |
945 | * current and next page in rq_respages[] */ |
946 | __be32 *p1, *tmp; |
947 | int len1, len2; |
948 | |
949 | /* grab next page for temporary storage of entry */ |
950 | p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]); |
951 | |
952 | p1 = encode_entry_baggage(cd, p1, name, namlen, ino); |
953 | |
954 | /* throw in readdirplus baggage */ |
955 | if (plus) { |
956 | struct svc_fh fh; |
957 | |
958 | if (compose_entry_fh(cd, &fh, name, namlen) > 0) { |
959 | /* zero out the filehandle */ |
960 | *p1++ = 0; |
961 | *p1++ = 0; |
962 | } else |
963 | p1 = encode_entryplus_baggage(cd, p1, &fh); |
964 | } |
965 | |
966 | /* determine entry word length and lengths to go in pages */ |
967 | num_entry_words = p1 - tmp; |
968 | len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer; |
969 | if ((num_entry_words << 2) < len1) { |
970 | /* the actual number of words in the entry is less |
971 | * than elen and can still fit in the current page |
972 | */ |
973 | memmove(p, tmp, num_entry_words << 2); |
974 | p += num_entry_words; |
975 | |
976 | /* update offset */ |
977 | cd->offset = cd->buffer + (cd->offset - tmp); |
978 | } else { |
979 | unsigned int offset_r = (cd->offset - tmp) << 2; |
980 | |
981 | /* update pointer to offset location. |
982 | * This is a 64bit quantity, so we need to |
983 | * deal with 3 cases: |
984 | * - entirely in first page |
985 | * - entirely in second page |
986 | * - 4 bytes in each page |
987 | */ |
988 | if (offset_r + 8 <= len1) { |
989 | cd->offset = p + (cd->offset - tmp); |
990 | } else if (offset_r >= len1) { |
991 | cd->offset -= len1 >> 2; |
992 | } else { |
993 | /* sitting on the fence */ |
994 | BUG_ON(offset_r != len1 - 4); |
995 | cd->offset = p + (cd->offset - tmp); |
996 | cd->offset1 = tmp; |
997 | } |
998 | |
999 | len2 = (num_entry_words << 2) - len1; |
1000 | |
1001 | /* move from temp page to current and next pages */ |
1002 | memmove(p, tmp, len1); |
1003 | memmove(tmp, (caddr_t)tmp+len1, len2); |
1004 | |
1005 | p = tmp + (len2 >> 2); |
1006 | } |
1007 | } |
1008 | else { |
1009 | cd->common.err = nfserr_toosmall; |
1010 | return -EINVAL; |
1011 | } |
1012 | |
1013 | cd->buflen -= num_entry_words; |
1014 | cd->buffer = p; |
1015 | cd->common.err = nfs_ok; |
1016 | return 0; |
1017 | |
1018 | } |
1019 | |
1020 | int |
1021 | nfs3svc_encode_entry(void *cd, const char *name, |
1022 | int namlen, loff_t offset, u64 ino, unsigned int d_type) |
1023 | { |
1024 | return encode_entry(cd, name, namlen, offset, ino, d_type, 0); |
1025 | } |
1026 | |
1027 | int |
1028 | nfs3svc_encode_entry_plus(void *cd, const char *name, |
1029 | int namlen, loff_t offset, u64 ino, |
1030 | unsigned int d_type) |
1031 | { |
1032 | return encode_entry(cd, name, namlen, offset, ino, d_type, 1); |
1033 | } |
1034 | |
1035 | /* FSSTAT */ |
1036 | int |
1037 | nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p, |
1038 | struct nfsd3_fsstatres *resp) |
1039 | { |
1040 | struct kstatfs *s = &resp->stats; |
1041 | u64 bs = s->f_bsize; |
1042 | |
1043 | *p++ = xdr_zero; /* no post_op_attr */ |
1044 | |
1045 | if (resp->status == 0) { |
1046 | p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */ |
1047 | p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */ |
1048 | p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */ |
1049 | p = xdr_encode_hyper(p, s->f_files); /* total inodes */ |
1050 | p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */ |
1051 | p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */ |
1052 | *p++ = htonl(resp->invarsec); /* mean unchanged time */ |
1053 | } |
1054 | return xdr_ressize_check(rqstp, p); |
1055 | } |
1056 | |
1057 | /* FSINFO */ |
1058 | int |
1059 | nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p, |
1060 | struct nfsd3_fsinfores *resp) |
1061 | { |
1062 | *p++ = xdr_zero; /* no post_op_attr */ |
1063 | |
1064 | if (resp->status == 0) { |
1065 | *p++ = htonl(resp->f_rtmax); |
1066 | *p++ = htonl(resp->f_rtpref); |
1067 | *p++ = htonl(resp->f_rtmult); |
1068 | *p++ = htonl(resp->f_wtmax); |
1069 | *p++ = htonl(resp->f_wtpref); |
1070 | *p++ = htonl(resp->f_wtmult); |
1071 | *p++ = htonl(resp->f_dtpref); |
1072 | p = xdr_encode_hyper(p, resp->f_maxfilesize); |
1073 | *p++ = xdr_one; |
1074 | *p++ = xdr_zero; |
1075 | *p++ = htonl(resp->f_properties); |
1076 | } |
1077 | |
1078 | return xdr_ressize_check(rqstp, p); |
1079 | } |
1080 | |
1081 | /* PATHCONF */ |
1082 | int |
1083 | nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p, |
1084 | struct nfsd3_pathconfres *resp) |
1085 | { |
1086 | *p++ = xdr_zero; /* no post_op_attr */ |
1087 | |
1088 | if (resp->status == 0) { |
1089 | *p++ = htonl(resp->p_link_max); |
1090 | *p++ = htonl(resp->p_name_max); |
1091 | *p++ = htonl(resp->p_no_trunc); |
1092 | *p++ = htonl(resp->p_chown_restricted); |
1093 | *p++ = htonl(resp->p_case_insensitive); |
1094 | *p++ = htonl(resp->p_case_preserving); |
1095 | } |
1096 | |
1097 | return xdr_ressize_check(rqstp, p); |
1098 | } |
1099 | |
1100 | /* COMMIT */ |
1101 | int |
1102 | nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p, |
1103 | struct nfsd3_commitres *resp) |
1104 | { |
1105 | p = encode_wcc_data(rqstp, p, &resp->fh); |
1106 | /* Write verifier */ |
1107 | if (resp->status == 0) { |
1108 | *p++ = htonl(nfssvc_boot.tv_sec); |
1109 | *p++ = htonl(nfssvc_boot.tv_usec); |
1110 | } |
1111 | return xdr_ressize_check(rqstp, p); |
1112 | } |
1113 | |
1114 | /* |
1115 | * XDR release functions |
1116 | */ |
1117 | int |
1118 | nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p, |
1119 | struct nfsd3_attrstat *resp) |
1120 | { |
1121 | fh_put(&resp->fh); |
1122 | return 1; |
1123 | } |
1124 | |
1125 | int |
1126 | nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p, |
1127 | struct nfsd3_fhandle_pair *resp) |
1128 | { |
1129 | fh_put(&resp->fh1); |
1130 | fh_put(&resp->fh2); |
1131 | return 1; |
1132 | } |
1133 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9