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nfsd: fix memory corruption caused by readdir
[linux-stable.git] / fs / nfsd / nfs3proc.c
blobc0de4d6cd8576c2f96a53eae96480467b2c58bd5
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Process version 3 NFS requests.
4 *
5 * Copyright (C) 1996, 1997, 1998 Olaf Kirch <okir@monad.swb.de>
6 */
7
8 #include <linux/fs.h>
9 #include <linux/ext2_fs.h>
10 #include <linux/magic.h>
11
12 #include "cache.h"
13 #include "xdr3.h"
14 #include "vfs.h"
15
16 #define NFSDDBG_FACILITY NFSDDBG_PROC
17
18 #define RETURN_STATUS(st) { resp->status = (st); return (st); }
19
20 static int nfs3_ftypes[] = {
21 0, /* NF3NON */
22 S_IFREG, /* NF3REG */
23 S_IFDIR, /* NF3DIR */
24 S_IFBLK, /* NF3BLK */
25 S_IFCHR, /* NF3CHR */
26 S_IFLNK, /* NF3LNK */
27 S_IFSOCK, /* NF3SOCK */
28 S_IFIFO, /* NF3FIFO */
29 };
30
31 /*
32 * NULL call.
33 */
34 static __be32
35 nfsd3_proc_null(struct svc_rqst *rqstp)
36 {
37 return nfs_ok;
38 }
39
40 /*
41 * Get a file's attributes
42 */
43 static __be32
44 nfsd3_proc_getattr(struct svc_rqst *rqstp)
45 {
46 struct nfsd_fhandle *argp = rqstp->rq_argp;
47 struct nfsd3_attrstat *resp = rqstp->rq_resp;
48 __be32 nfserr;
49
50 dprintk("nfsd: GETATTR(3) %s\n",
51 SVCFH_fmt(&argp->fh));
52
53 fh_copy(&resp->fh, &argp->fh);
54 nfserr = fh_verify(rqstp, &resp->fh, 0,
55 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
56 if (nfserr)
57 RETURN_STATUS(nfserr);
58
59 nfserr = fh_getattr(&resp->fh, &resp->stat);
60
61 RETURN_STATUS(nfserr);
62 }
63
64 /*
65 * Set a file's attributes
66 */
67 static __be32
68 nfsd3_proc_setattr(struct svc_rqst *rqstp)
69 {
70 struct nfsd3_sattrargs *argp = rqstp->rq_argp;
71 struct nfsd3_attrstat *resp = rqstp->rq_resp;
72 __be32 nfserr;
73
74 dprintk("nfsd: SETATTR(3) %s\n",
75 SVCFH_fmt(&argp->fh));
76
77 fh_copy(&resp->fh, &argp->fh);
78 nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,
79 argp->check_guard, argp->guardtime);
80 RETURN_STATUS(nfserr);
81 }
82
83 /*
84 * Look up a path name component
85 */
86 static __be32
87 nfsd3_proc_lookup(struct svc_rqst *rqstp)
88 {
89 struct nfsd3_diropargs *argp = rqstp->rq_argp;
90 struct nfsd3_diropres *resp = rqstp->rq_resp;
91 __be32 nfserr;
92
93 dprintk("nfsd: LOOKUP(3) %s %.*s\n",
94 SVCFH_fmt(&argp->fh),
95 argp->len,
96 argp->name);
97
98 fh_copy(&resp->dirfh, &argp->fh);
99 fh_init(&resp->fh, NFS3_FHSIZE);
100
101 nfserr = nfsd_lookup(rqstp, &resp->dirfh,
102 argp->name,
103 argp->len,
104 &resp->fh);
105 RETURN_STATUS(nfserr);
106 }
107
108 /*
109 * Check file access
110 */
111 static __be32
112 nfsd3_proc_access(struct svc_rqst *rqstp)
113 {
114 struct nfsd3_accessargs *argp = rqstp->rq_argp;
115 struct nfsd3_accessres *resp = rqstp->rq_resp;
116 __be32 nfserr;
117
118 dprintk("nfsd: ACCESS(3) %s 0x%x\n",
119 SVCFH_fmt(&argp->fh),
120 argp->access);
121
122 fh_copy(&resp->fh, &argp->fh);
123 resp->access = argp->access;
124 nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
125 RETURN_STATUS(nfserr);
126 }
127
128 /*
129 * Read a symlink.
130 */
131 static __be32
132 nfsd3_proc_readlink(struct svc_rqst *rqstp)
133 {
134 struct nfsd3_readlinkargs *argp = rqstp->rq_argp;
135 struct nfsd3_readlinkres *resp = rqstp->rq_resp;
136 __be32 nfserr;
137
138 dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));
139
140 /* Read the symlink. */
141 fh_copy(&resp->fh, &argp->fh);
142 resp->len = NFS3_MAXPATHLEN;
143 nfserr = nfsd_readlink(rqstp, &resp->fh, argp->buffer, &resp->len);
144 RETURN_STATUS(nfserr);
145 }
146
147 /*
148 * Read a portion of a file.
149 */
150 static __be32
151 nfsd3_proc_read(struct svc_rqst *rqstp)
152 {
153 struct nfsd3_readargs *argp = rqstp->rq_argp;
154 struct nfsd3_readres *resp = rqstp->rq_resp;
155 __be32 nfserr;
156 u32 max_blocksize = svc_max_payload(rqstp);
157 unsigned long cnt = min(argp->count, max_blocksize);
158
159 dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n",
160 SVCFH_fmt(&argp->fh),
161 (unsigned long) argp->count,
162 (unsigned long long) argp->offset);
163
164 /* Obtain buffer pointer for payload.
165 * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
166 * + 1 (xdr opaque byte count) = 26
167 */
168 resp->count = cnt;
169 svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4);
170
171 fh_copy(&resp->fh, &argp->fh);
172 nfserr = nfsd_read(rqstp, &resp->fh,
173 argp->offset,
174 rqstp->rq_vec, argp->vlen,
175 &resp->count);
176 if (nfserr == 0) {
177 struct inode *inode = d_inode(resp->fh.fh_dentry);
178 resp->eof = nfsd_eof_on_read(cnt, resp->count, argp->offset,
179 inode->i_size);
180 }
181
182 RETURN_STATUS(nfserr);
183 }
184
185 /*
186 * Write data to a file
187 */
188 static __be32
189 nfsd3_proc_write(struct svc_rqst *rqstp)
190 {
191 struct nfsd3_writeargs *argp = rqstp->rq_argp;
192 struct nfsd3_writeres *resp = rqstp->rq_resp;
193 __be32 nfserr;
194 unsigned long cnt = argp->len;
195
196 dprintk("nfsd: WRITE(3) %s %d bytes at %Lu%s\n",
197 SVCFH_fmt(&argp->fh),
198 argp->len,
199 (unsigned long long) argp->offset,
200 argp->stable? " stable" : "");
201
202 fh_copy(&resp->fh, &argp->fh);
203 resp->committed = argp->stable;
204 nfserr = nfsd_write(rqstp, &resp->fh, argp->offset,
205 rqstp->rq_vec, argp->vlen,
206 &cnt, resp->committed);
207 resp->count = cnt;
208 RETURN_STATUS(nfserr);
209 }
210
211 /*
212 * With NFSv3, CREATE processing is a lot easier than with NFSv2.
213 * At least in theory; we'll see how it fares in practice when the
214 * first reports about SunOS compatibility problems start to pour in...
215 */
216 static __be32
217 nfsd3_proc_create(struct svc_rqst *rqstp)
218 {
219 struct nfsd3_createargs *argp = rqstp->rq_argp;
220 struct nfsd3_diropres *resp = rqstp->rq_resp;
221 svc_fh *dirfhp, *newfhp = NULL;
222 struct iattr *attr;
223 __be32 nfserr;
224
225 dprintk("nfsd: CREATE(3) %s %.*s\n",
226 SVCFH_fmt(&argp->fh),
227 argp->len,
228 argp->name);
229
230 dirfhp = fh_copy(&resp->dirfh, &argp->fh);
231 newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
232 attr = &argp->attrs;
233
234 /* Unfudge the mode bits */
235 attr->ia_mode &= ~S_IFMT;
236 if (!(attr->ia_valid & ATTR_MODE)) {
237 attr->ia_valid |= ATTR_MODE;
238 attr->ia_mode = S_IFREG;
239 } else {
240 attr->ia_mode = (attr->ia_mode & ~S_IFMT) | S_IFREG;
241 }
242
243 /* Now create the file and set attributes */
244 nfserr = do_nfsd_create(rqstp, dirfhp, argp->name, argp->len,
245 attr, newfhp,
246 argp->createmode, (u32 *)argp->verf, NULL, NULL);
247
248 RETURN_STATUS(nfserr);
249 }
250
251 /*
252 * Make directory. This operation is not idempotent.
253 */
254 static __be32
255 nfsd3_proc_mkdir(struct svc_rqst *rqstp)
256 {
257 struct nfsd3_createargs *argp = rqstp->rq_argp;
258 struct nfsd3_diropres *resp = rqstp->rq_resp;
259 __be32 nfserr;
260
261 dprintk("nfsd: MKDIR(3) %s %.*s\n",
262 SVCFH_fmt(&argp->fh),
263 argp->len,
264 argp->name);
265
266 argp->attrs.ia_valid &= ~ATTR_SIZE;
267 fh_copy(&resp->dirfh, &argp->fh);
268 fh_init(&resp->fh, NFS3_FHSIZE);
269 nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
270 &argp->attrs, S_IFDIR, 0, &resp->fh);
271 fh_unlock(&resp->dirfh);
272 RETURN_STATUS(nfserr);
273 }
274
275 static __be32
276 nfsd3_proc_symlink(struct svc_rqst *rqstp)
277 {
278 struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
279 struct nfsd3_diropres *resp = rqstp->rq_resp;
280 __be32 nfserr;
281
282 dprintk("nfsd: SYMLINK(3) %s %.*s -> %.*s\n",
283 SVCFH_fmt(&argp->ffh),
284 argp->flen, argp->fname,
285 argp->tlen, argp->tname);
286
287 fh_copy(&resp->dirfh, &argp->ffh);
288 fh_init(&resp->fh, NFS3_FHSIZE);
289 nfserr = nfsd_symlink(rqstp, &resp->dirfh, argp->fname, argp->flen,
290 argp->tname, &resp->fh);
291 RETURN_STATUS(nfserr);
292 }
293
294 /*
295 * Make socket/fifo/device.
296 */
297 static __be32
298 nfsd3_proc_mknod(struct svc_rqst *rqstp)
299 {
300 struct nfsd3_mknodargs *argp = rqstp->rq_argp;
301 struct nfsd3_diropres *resp = rqstp->rq_resp;
302 __be32 nfserr;
303 int type;
304 dev_t rdev = 0;
305
306 dprintk("nfsd: MKNOD(3) %s %.*s\n",
307 SVCFH_fmt(&argp->fh),
308 argp->len,
309 argp->name);
310
311 fh_copy(&resp->dirfh, &argp->fh);
312 fh_init(&resp->fh, NFS3_FHSIZE);
313
314 if (argp->ftype == 0 || argp->ftype >= NF3BAD)
315 RETURN_STATUS(nfserr_inval);
316 if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
317 rdev = MKDEV(argp->major, argp->minor);
318 if (MAJOR(rdev) != argp->major ||
319 MINOR(rdev) != argp->minor)
320 RETURN_STATUS(nfserr_inval);
321 } else
322 if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO)
323 RETURN_STATUS(nfserr_inval);
324
325 type = nfs3_ftypes[argp->ftype];
326 nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
327 &argp->attrs, type, rdev, &resp->fh);
328 fh_unlock(&resp->dirfh);
329 RETURN_STATUS(nfserr);
330 }
331
332 /*
333 * Remove file/fifo/socket etc.
334 */
335 static __be32
336 nfsd3_proc_remove(struct svc_rqst *rqstp)
337 {
338 struct nfsd3_diropargs *argp = rqstp->rq_argp;
339 struct nfsd3_attrstat *resp = rqstp->rq_resp;
340 __be32 nfserr;
341
342 dprintk("nfsd: REMOVE(3) %s %.*s\n",
343 SVCFH_fmt(&argp->fh),
344 argp->len,
345 argp->name);
346
347 /* Unlink. -S_IFDIR means file must not be a directory */
348 fh_copy(&resp->fh, &argp->fh);
349 nfserr = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR, argp->name, argp->len);
350 fh_unlock(&resp->fh);
351 RETURN_STATUS(nfserr);
352 }
353
354 /*
355 * Remove a directory
356 */
357 static __be32
358 nfsd3_proc_rmdir(struct svc_rqst *rqstp)
359 {
360 struct nfsd3_diropargs *argp = rqstp->rq_argp;
361 struct nfsd3_attrstat *resp = rqstp->rq_resp;
362 __be32 nfserr;
363
364 dprintk("nfsd: RMDIR(3) %s %.*s\n",
365 SVCFH_fmt(&argp->fh),
366 argp->len,
367 argp->name);
368
369 fh_copy(&resp->fh, &argp->fh);
370 nfserr = nfsd_unlink(rqstp, &resp->fh, S_IFDIR, argp->name, argp->len);
371 fh_unlock(&resp->fh);
372 RETURN_STATUS(nfserr);
373 }
374
375 static __be32
376 nfsd3_proc_rename(struct svc_rqst *rqstp)
377 {
378 struct nfsd3_renameargs *argp = rqstp->rq_argp;
379 struct nfsd3_renameres *resp = rqstp->rq_resp;
380 __be32 nfserr;
381
382 dprintk("nfsd: RENAME(3) %s %.*s ->\n",
383 SVCFH_fmt(&argp->ffh),
384 argp->flen,
385 argp->fname);
386 dprintk("nfsd: -> %s %.*s\n",
387 SVCFH_fmt(&argp->tfh),
388 argp->tlen,
389 argp->tname);
390
391 fh_copy(&resp->ffh, &argp->ffh);
392 fh_copy(&resp->tfh, &argp->tfh);
393 nfserr = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
394 &resp->tfh, argp->tname, argp->tlen);
395 RETURN_STATUS(nfserr);
396 }
397
398 static __be32
399 nfsd3_proc_link(struct svc_rqst *rqstp)
400 {
401 struct nfsd3_linkargs *argp = rqstp->rq_argp;
402 struct nfsd3_linkres *resp = rqstp->rq_resp;
403 __be32 nfserr;
404
405 dprintk("nfsd: LINK(3) %s ->\n",
406 SVCFH_fmt(&argp->ffh));
407 dprintk("nfsd: -> %s %.*s\n",
408 SVCFH_fmt(&argp->tfh),
409 argp->tlen,
410 argp->tname);
411
412 fh_copy(&resp->fh, &argp->ffh);
413 fh_copy(&resp->tfh, &argp->tfh);
414 nfserr = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
415 &resp->fh);
416 RETURN_STATUS(nfserr);
417 }
418
419 /*
420 * Read a portion of a directory.
421 */
422 static __be32
423 nfsd3_proc_readdir(struct svc_rqst *rqstp)
424 {
425 struct nfsd3_readdirargs *argp = rqstp->rq_argp;
426 struct nfsd3_readdirres *resp = rqstp->rq_resp;
427 __be32 nfserr;
428 int count;
429
430 dprintk("nfsd: READDIR(3) %s %d bytes at %d\n",
431 SVCFH_fmt(&argp->fh),
432 argp->count, (u32) argp->cookie);
433
434 /* Make sure we've room for the NULL ptr & eof flag, and shrink to
435 * client read size */
436 count = (argp->count >> 2) - 2;
437
438 /* Read directory and encode entries on the fly */
439 fh_copy(&resp->fh, &argp->fh);
440
441 resp->buflen = count;
442 resp->common.err = nfs_ok;
443 resp->buffer = argp->buffer;
444 resp->rqstp = rqstp;
445 nfserr = nfsd_readdir(rqstp, &resp->fh, (loff_t*) &argp->cookie,
446 &resp->common, nfs3svc_encode_entry);
447 memcpy(resp->verf, argp->verf, 8);
448 resp->count = resp->buffer - argp->buffer;
449 if (resp->offset) {
450 loff_t offset = argp->cookie;
451
452 if (unlikely(resp->offset1)) {
453 /* we ended up with offset on a page boundary */
454 *resp->offset = htonl(offset >> 32);
455 *resp->offset1 = htonl(offset & 0xffffffff);
456 resp->offset1 = NULL;
457 } else {
458 xdr_encode_hyper(resp->offset, offset);
459 }
460 resp->offset = NULL;
461 }
462
463 RETURN_STATUS(nfserr);
464 }
465
466 /*
467 * Read a portion of a directory, including file handles and attrs.
468 * For now, we choose to ignore the dircount parameter.
469 */
470 static __be32
471 nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
472 {
473 struct nfsd3_readdirargs *argp = rqstp->rq_argp;
474 struct nfsd3_readdirres *resp = rqstp->rq_resp;
475 __be32 nfserr;
476 int count = 0;
477 loff_t offset;
478 struct page **p;
479 caddr_t page_addr = NULL;
480
481 dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
482 SVCFH_fmt(&argp->fh),
483 argp->count, (u32) argp->cookie);
484
485 /* Convert byte count to number of words (i.e. >> 2),
486 * and reserve room for the NULL ptr & eof flag (-2 words) */
487 resp->count = (argp->count >> 2) - 2;
488
489 /* Read directory and encode entries on the fly */
490 fh_copy(&resp->fh, &argp->fh);
491
492 resp->common.err = nfs_ok;
493 resp->buffer = argp->buffer;
494 resp->buflen = resp->count;
495 resp->rqstp = rqstp;
496 offset = argp->cookie;
497
498 nfserr = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
499 if (nfserr)
500 RETURN_STATUS(nfserr);
501
502 if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS)
503 RETURN_STATUS(nfserr_notsupp);
504
505 nfserr = nfsd_readdir(rqstp, &resp->fh,
506 &offset,
507 &resp->common,
508 nfs3svc_encode_entry_plus);
509 memcpy(resp->verf, argp->verf, 8);
510 for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
511 page_addr = page_address(*p);
512
513 if (((caddr_t)resp->buffer >= page_addr) &&
514 ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
515 count += (caddr_t)resp->buffer - page_addr;
516 break;
517 }
518 count += PAGE_SIZE;
519 }
520 resp->count = count >> 2;
521 if (resp->offset) {
522 if (unlikely(resp->offset1)) {
523 /* we ended up with offset on a page boundary */
524 *resp->offset = htonl(offset >> 32);
525 *resp->offset1 = htonl(offset & 0xffffffff);
526 resp->offset1 = NULL;
527 } else {
528 xdr_encode_hyper(resp->offset, offset);
529 }
530 resp->offset = NULL;
531 }
532
533 RETURN_STATUS(nfserr);
534 }
535
536 /*
537 * Get file system stats
538 */
539 static __be32
540 nfsd3_proc_fsstat(struct svc_rqst *rqstp)
541 {
542 struct nfsd_fhandle *argp = rqstp->rq_argp;
543 struct nfsd3_fsstatres *resp = rqstp->rq_resp;
544 __be32 nfserr;
545
546 dprintk("nfsd: FSSTAT(3) %s\n",
547 SVCFH_fmt(&argp->fh));
548
549 nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
550 fh_put(&argp->fh);
551 RETURN_STATUS(nfserr);
552 }
553
554 /*
555 * Get file system info
556 */
557 static __be32
558 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
559 {
560 struct nfsd_fhandle *argp = rqstp->rq_argp;
561 struct nfsd3_fsinfores *resp = rqstp->rq_resp;
562 __be32 nfserr;
563 u32 max_blocksize = svc_max_payload(rqstp);
564
565 dprintk("nfsd: FSINFO(3) %s\n",
566 SVCFH_fmt(&argp->fh));
567
568 resp->f_rtmax = max_blocksize;
569 resp->f_rtpref = max_blocksize;
570 resp->f_rtmult = PAGE_SIZE;
571 resp->f_wtmax = max_blocksize;
572 resp->f_wtpref = max_blocksize;
573 resp->f_wtmult = PAGE_SIZE;
574 resp->f_dtpref = PAGE_SIZE;
575 resp->f_maxfilesize = ~(u32) 0;
576 resp->f_properties = NFS3_FSF_DEFAULT;
577
578 nfserr = fh_verify(rqstp, &argp->fh, 0,
579 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
580
581 /* Check special features of the file system. May request
582 * different read/write sizes for file systems known to have
583 * problems with large blocks */
584 if (nfserr == 0) {
585 struct super_block *sb = argp->fh.fh_dentry->d_sb;
586
587 /* Note that we don't care for remote fs's here */
588 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
589 resp->f_properties = NFS3_FSF_BILLYBOY;
590 }
591 resp->f_maxfilesize = sb->s_maxbytes;
592 }
593
594 fh_put(&argp->fh);
595 RETURN_STATUS(nfserr);
596 }
597
598 /*
599 * Get pathconf info for the specified file
600 */
601 static __be32
602 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
603 {
604 struct nfsd_fhandle *argp = rqstp->rq_argp;
605 struct nfsd3_pathconfres *resp = rqstp->rq_resp;
606 __be32 nfserr;
607
608 dprintk("nfsd: PATHCONF(3) %s\n",
609 SVCFH_fmt(&argp->fh));
610
611 /* Set default pathconf */
612 resp->p_link_max = 255; /* at least */
613 resp->p_name_max = 255; /* at least */
614 resp->p_no_trunc = 0;
615 resp->p_chown_restricted = 1;
616 resp->p_case_insensitive = 0;
617 resp->p_case_preserving = 1;
618
619 nfserr = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
620
621 if (nfserr == 0) {
622 struct super_block *sb = argp->fh.fh_dentry->d_sb;
623
624 /* Note that we don't care for remote fs's here */
625 switch (sb->s_magic) {
626 case EXT2_SUPER_MAGIC:
627 resp->p_link_max = EXT2_LINK_MAX;
628 resp->p_name_max = EXT2_NAME_LEN;
629 break;
630 case MSDOS_SUPER_MAGIC:
631 resp->p_case_insensitive = 1;
632 resp->p_case_preserving = 0;
633 break;
634 }
635 }
636
637 fh_put(&argp->fh);
638 RETURN_STATUS(nfserr);
639 }
640
641
642 /*
643 * Commit a file (range) to stable storage.
644 */
645 static __be32
646 nfsd3_proc_commit(struct svc_rqst *rqstp)
647 {
648 struct nfsd3_commitargs *argp = rqstp->rq_argp;
649 struct nfsd3_commitres *resp = rqstp->rq_resp;
650 __be32 nfserr;
651
652 dprintk("nfsd: COMMIT(3) %s %u@%Lu\n",
653 SVCFH_fmt(&argp->fh),
654 argp->count,
655 (unsigned long long) argp->offset);
656
657 if (argp->offset > NFS_OFFSET_MAX)
658 RETURN_STATUS(nfserr_inval);
659
660 fh_copy(&resp->fh, &argp->fh);
661 nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count);
662
663 RETURN_STATUS(nfserr);
664 }
665
666
667 /*
668 * NFSv3 Server procedures.
669 * Only the results of non-idempotent operations are cached.
670 */
671 #define nfs3svc_decode_fhandleargs nfs3svc_decode_fhandle
672 #define nfs3svc_encode_attrstatres nfs3svc_encode_attrstat
673 #define nfs3svc_encode_wccstatres nfs3svc_encode_wccstat
674 #define nfsd3_mkdirargs nfsd3_createargs
675 #define nfsd3_readdirplusargs nfsd3_readdirargs
676 #define nfsd3_fhandleargs nfsd_fhandle
677 #define nfsd3_fhandleres nfsd3_attrstat
678 #define nfsd3_attrstatres nfsd3_attrstat
679 #define nfsd3_wccstatres nfsd3_attrstat
680 #define nfsd3_createres nfsd3_diropres
681 #define nfsd3_voidres nfsd3_voidargs
682 struct nfsd3_voidargs { int dummy; };
683
684 #define ST 1 /* status*/
685 #define FH 17 /* filehandle with length */
686 #define AT 21 /* attributes */
687 #define pAT (1+AT) /* post attributes - conditional */
688 #define WC (7+pAT) /* WCC attributes */
689
690 static const struct svc_procedure nfsd_procedures3[22] = {
691 [NFS3PROC_NULL] = {
692 .pc_func = nfsd3_proc_null,
693 .pc_encode = nfs3svc_encode_voidres,
694 .pc_argsize = sizeof(struct nfsd3_voidargs),
695 .pc_ressize = sizeof(struct nfsd3_voidres),
696 .pc_cachetype = RC_NOCACHE,
697 .pc_xdrressize = ST,
698 },
699 [NFS3PROC_GETATTR] = {
700 .pc_func = nfsd3_proc_getattr,
701 .pc_decode = nfs3svc_decode_fhandleargs,
702 .pc_encode = nfs3svc_encode_attrstatres,
703 .pc_release = nfs3svc_release_fhandle,
704 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
705 .pc_ressize = sizeof(struct nfsd3_attrstatres),
706 .pc_cachetype = RC_NOCACHE,
707 .pc_xdrressize = ST+AT,
708 },
709 [NFS3PROC_SETATTR] = {
710 .pc_func = nfsd3_proc_setattr,
711 .pc_decode = nfs3svc_decode_sattrargs,
712 .pc_encode = nfs3svc_encode_wccstatres,
713 .pc_release = nfs3svc_release_fhandle,
714 .pc_argsize = sizeof(struct nfsd3_sattrargs),
715 .pc_ressize = sizeof(struct nfsd3_wccstatres),
716 .pc_cachetype = RC_REPLBUFF,
717 .pc_xdrressize = ST+WC,
718 },
719 [NFS3PROC_LOOKUP] = {
720 .pc_func = nfsd3_proc_lookup,
721 .pc_decode = nfs3svc_decode_diropargs,
722 .pc_encode = nfs3svc_encode_diropres,
723 .pc_release = nfs3svc_release_fhandle2,
724 .pc_argsize = sizeof(struct nfsd3_diropargs),
725 .pc_ressize = sizeof(struct nfsd3_diropres),
726 .pc_cachetype = RC_NOCACHE,
727 .pc_xdrressize = ST+FH+pAT+pAT,
728 },
729 [NFS3PROC_ACCESS] = {
730 .pc_func = nfsd3_proc_access,
731 .pc_decode = nfs3svc_decode_accessargs,
732 .pc_encode = nfs3svc_encode_accessres,
733 .pc_release = nfs3svc_release_fhandle,
734 .pc_argsize = sizeof(struct nfsd3_accessargs),
735 .pc_ressize = sizeof(struct nfsd3_accessres),
736 .pc_cachetype = RC_NOCACHE,
737 .pc_xdrressize = ST+pAT+1,
738 },
739 [NFS3PROC_READLINK] = {
740 .pc_func = nfsd3_proc_readlink,
741 .pc_decode = nfs3svc_decode_readlinkargs,
742 .pc_encode = nfs3svc_encode_readlinkres,
743 .pc_release = nfs3svc_release_fhandle,
744 .pc_argsize = sizeof(struct nfsd3_readlinkargs),
745 .pc_ressize = sizeof(struct nfsd3_readlinkres),
746 .pc_cachetype = RC_NOCACHE,
747 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
748 },
749 [NFS3PROC_READ] = {
750 .pc_func = nfsd3_proc_read,
751 .pc_decode = nfs3svc_decode_readargs,
752 .pc_encode = nfs3svc_encode_readres,
753 .pc_release = nfs3svc_release_fhandle,
754 .pc_argsize = sizeof(struct nfsd3_readargs),
755 .pc_ressize = sizeof(struct nfsd3_readres),
756 .pc_cachetype = RC_NOCACHE,
757 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
758 },
759 [NFS3PROC_WRITE] = {
760 .pc_func = nfsd3_proc_write,
761 .pc_decode = nfs3svc_decode_writeargs,
762 .pc_encode = nfs3svc_encode_writeres,
763 .pc_release = nfs3svc_release_fhandle,
764 .pc_argsize = sizeof(struct nfsd3_writeargs),
765 .pc_ressize = sizeof(struct nfsd3_writeres),
766 .pc_cachetype = RC_REPLBUFF,
767 .pc_xdrressize = ST+WC+4,
768 },
769 [NFS3PROC_CREATE] = {
770 .pc_func = nfsd3_proc_create,
771 .pc_decode = nfs3svc_decode_createargs,
772 .pc_encode = nfs3svc_encode_createres,
773 .pc_release = nfs3svc_release_fhandle2,
774 .pc_argsize = sizeof(struct nfsd3_createargs),
775 .pc_ressize = sizeof(struct nfsd3_createres),
776 .pc_cachetype = RC_REPLBUFF,
777 .pc_xdrressize = ST+(1+FH+pAT)+WC,
778 },
779 [NFS3PROC_MKDIR] = {
780 .pc_func = nfsd3_proc_mkdir,
781 .pc_decode = nfs3svc_decode_mkdirargs,
782 .pc_encode = nfs3svc_encode_createres,
783 .pc_release = nfs3svc_release_fhandle2,
784 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
785 .pc_ressize = sizeof(struct nfsd3_createres),
786 .pc_cachetype = RC_REPLBUFF,
787 .pc_xdrressize = ST+(1+FH+pAT)+WC,
788 },
789 [NFS3PROC_SYMLINK] = {
790 .pc_func = nfsd3_proc_symlink,
791 .pc_decode = nfs3svc_decode_symlinkargs,
792 .pc_encode = nfs3svc_encode_createres,
793 .pc_release = nfs3svc_release_fhandle2,
794 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
795 .pc_ressize = sizeof(struct nfsd3_createres),
796 .pc_cachetype = RC_REPLBUFF,
797 .pc_xdrressize = ST+(1+FH+pAT)+WC,
798 },
799 [NFS3PROC_MKNOD] = {
800 .pc_func = nfsd3_proc_mknod,
801 .pc_decode = nfs3svc_decode_mknodargs,
802 .pc_encode = nfs3svc_encode_createres,
803 .pc_release = nfs3svc_release_fhandle2,
804 .pc_argsize = sizeof(struct nfsd3_mknodargs),
805 .pc_ressize = sizeof(struct nfsd3_createres),
806 .pc_cachetype = RC_REPLBUFF,
807 .pc_xdrressize = ST+(1+FH+pAT)+WC,
808 },
809 [NFS3PROC_REMOVE] = {
810 .pc_func = nfsd3_proc_remove,
811 .pc_decode = nfs3svc_decode_diropargs,
812 .pc_encode = nfs3svc_encode_wccstatres,
813 .pc_release = nfs3svc_release_fhandle,
814 .pc_argsize = sizeof(struct nfsd3_diropargs),
815 .pc_ressize = sizeof(struct nfsd3_wccstatres),
816 .pc_cachetype = RC_REPLBUFF,
817 .pc_xdrressize = ST+WC,
818 },
819 [NFS3PROC_RMDIR] = {
820 .pc_func = nfsd3_proc_rmdir,
821 .pc_decode = nfs3svc_decode_diropargs,
822 .pc_encode = nfs3svc_encode_wccstatres,
823 .pc_release = nfs3svc_release_fhandle,
824 .pc_argsize = sizeof(struct nfsd3_diropargs),
825 .pc_ressize = sizeof(struct nfsd3_wccstatres),
826 .pc_cachetype = RC_REPLBUFF,
827 .pc_xdrressize = ST+WC,
828 },
829 [NFS3PROC_RENAME] = {
830 .pc_func = nfsd3_proc_rename,
831 .pc_decode = nfs3svc_decode_renameargs,
832 .pc_encode = nfs3svc_encode_renameres,
833 .pc_release = nfs3svc_release_fhandle2,
834 .pc_argsize = sizeof(struct nfsd3_renameargs),
835 .pc_ressize = sizeof(struct nfsd3_renameres),
836 .pc_cachetype = RC_REPLBUFF,
837 .pc_xdrressize = ST+WC+WC,
838 },
839 [NFS3PROC_LINK] = {
840 .pc_func = nfsd3_proc_link,
841 .pc_decode = nfs3svc_decode_linkargs,
842 .pc_encode = nfs3svc_encode_linkres,
843 .pc_release = nfs3svc_release_fhandle2,
844 .pc_argsize = sizeof(struct nfsd3_linkargs),
845 .pc_ressize = sizeof(struct nfsd3_linkres),
846 .pc_cachetype = RC_REPLBUFF,
847 .pc_xdrressize = ST+pAT+WC,
848 },
849 [NFS3PROC_READDIR] = {
850 .pc_func = nfsd3_proc_readdir,
851 .pc_decode = nfs3svc_decode_readdirargs,
852 .pc_encode = nfs3svc_encode_readdirres,
853 .pc_release = nfs3svc_release_fhandle,
854 .pc_argsize = sizeof(struct nfsd3_readdirargs),
855 .pc_ressize = sizeof(struct nfsd3_readdirres),
856 .pc_cachetype = RC_NOCACHE,
857 },
858 [NFS3PROC_READDIRPLUS] = {
859 .pc_func = nfsd3_proc_readdirplus,
860 .pc_decode = nfs3svc_decode_readdirplusargs,
861 .pc_encode = nfs3svc_encode_readdirres,
862 .pc_release = nfs3svc_release_fhandle,
863 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
864 .pc_ressize = sizeof(struct nfsd3_readdirres),
865 .pc_cachetype = RC_NOCACHE,
866 },
867 [NFS3PROC_FSSTAT] = {
868 .pc_func = nfsd3_proc_fsstat,
869 .pc_decode = nfs3svc_decode_fhandleargs,
870 .pc_encode = nfs3svc_encode_fsstatres,
871 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
872 .pc_ressize = sizeof(struct nfsd3_fsstatres),
873 .pc_cachetype = RC_NOCACHE,
874 .pc_xdrressize = ST+pAT+2*6+1,
875 },
876 [NFS3PROC_FSINFO] = {
877 .pc_func = nfsd3_proc_fsinfo,
878 .pc_decode = nfs3svc_decode_fhandleargs,
879 .pc_encode = nfs3svc_encode_fsinfores,
880 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
881 .pc_ressize = sizeof(struct nfsd3_fsinfores),
882 .pc_cachetype = RC_NOCACHE,
883 .pc_xdrressize = ST+pAT+12,
884 },
885 [NFS3PROC_PATHCONF] = {
886 .pc_func = nfsd3_proc_pathconf,
887 .pc_decode = nfs3svc_decode_fhandleargs,
888 .pc_encode = nfs3svc_encode_pathconfres,
889 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
890 .pc_ressize = sizeof(struct nfsd3_pathconfres),
891 .pc_cachetype = RC_NOCACHE,
892 .pc_xdrressize = ST+pAT+6,
893 },
894 [NFS3PROC_COMMIT] = {
895 .pc_func = nfsd3_proc_commit,
896 .pc_decode = nfs3svc_decode_commitargs,
897 .pc_encode = nfs3svc_encode_commitres,
898 .pc_release = nfs3svc_release_fhandle,
899 .pc_argsize = sizeof(struct nfsd3_commitargs),
900 .pc_ressize = sizeof(struct nfsd3_commitres),
901 .pc_cachetype = RC_NOCACHE,
902 .pc_xdrressize = ST+WC+2,
903 },
904 };
905
906 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
907 const struct svc_version nfsd_version3 = {
908 .vs_vers = 3,
909 .vs_nproc = 22,
910 .vs_proc = nfsd_procedures3,
911 .vs_dispatch = nfsd_dispatch,
912 .vs_count = nfsd_count3,
913 .vs_xdrsize = NFS3_SVC_XDRSIZE,
914 };
Linux kernel stable tree