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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / fs / nfsd / nfsproc.c
blob6cfc96a1248314b24a2ec754900e06ceae483116
1 /*
2 * nfsproc2.c Process version 2 NFS requests.
3 * linux/fs/nfsd/nfs2proc.c
4 *
5 * Process version 2 NFS requests.
6 *
7 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
8 */
9
10 #include <linux/linkage.h>
11 #include <linux/time.h>
12 #include <linux/errno.h>
13 #include <linux/fs.h>
14 #include <linux/stat.h>
15 #include <linux/fcntl.h>
16 #include <linux/net.h>
17 #include <linux/in.h>
18 #include <linux/namei.h>
19 #include <linux/unistd.h>
20 #include <linux/slab.h>
21
22 #include <linux/sunrpc/clnt.h>
23 #include <linux/sunrpc/svc.h>
24 #include <linux/nfsd/nfsd.h>
25 #include <linux/nfsd/cache.h>
26 #include <linux/nfsd/xdr.h>
27
28 typedef struct svc_rqst svc_rqst;
29 typedef struct svc_buf svc_buf;
30
31 #define NFSDDBG_FACILITY NFSDDBG_PROC
32
33
34 static __be32
35 nfsd_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
36 {
37 return nfs_ok;
38 }
39
40 static __be32
41 nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp)
42 {
43 if (err) return err;
44 return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
45 resp->fh.fh_dentry,
46 &resp->stat));
47 }
48 static __be32
49 nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
50 {
51 if (err) return err;
52 return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
53 resp->fh.fh_dentry,
54 &resp->stat));
55 }
56 /*
57 * Get a file's attributes
58 * N.B. After this call resp->fh needs an fh_put
59 */
60 static __be32
61 nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle *argp,
62 struct nfsd_attrstat *resp)
63 {
64 __be32 nfserr;
65 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
66
67 fh_copy(&resp->fh, &argp->fh);
68 nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_NOP);
69 return nfsd_return_attrs(nfserr, resp);
70 }
71
72 /*
73 * Set a file's attributes
74 * N.B. After this call resp->fh needs an fh_put
75 */
76 static __be32
77 nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp,
78 struct nfsd_attrstat *resp)
79 {
80 __be32 nfserr;
81 dprintk("nfsd: SETATTR %s, valid=%x, size=%ld\n",
82 SVCFH_fmt(&argp->fh),
83 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
84
85 fh_copy(&resp->fh, &argp->fh);
86 nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,0, (time_t)0);
87 return nfsd_return_attrs(nfserr, resp);
88 }
89
90 /*
91 * Look up a path name component
92 * Note: the dentry in the resp->fh may be negative if the file
93 * doesn't exist yet.
94 * N.B. After this call resp->fh needs an fh_put
95 */
96 static __be32
97 nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
98 struct nfsd_diropres *resp)
99 {
100 __be32 nfserr;
101
102 dprintk("nfsd: LOOKUP %s %.*s\n",
103 SVCFH_fmt(&argp->fh), argp->len, argp->name);
104
105 fh_init(&resp->fh, NFS_FHSIZE);
106 nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
107 &resp->fh);
108
109 fh_put(&argp->fh);
110 return nfsd_return_dirop(nfserr, resp);
111 }
112
113 /*
114 * Read a symlink.
115 */
116 static __be32
117 nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
118 struct nfsd_readlinkres *resp)
119 {
120 __be32 nfserr;
121
122 dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
123
124 /* Read the symlink. */
125 resp->len = NFS_MAXPATHLEN;
126 nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
127
128 fh_put(&argp->fh);
129 return nfserr;
130 }
131
132 /*
133 * Read a portion of a file.
134 * N.B. After this call resp->fh needs an fh_put
135 */
136 static __be32
137 nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
138 struct nfsd_readres *resp)
139 {
140 __be32 nfserr;
141
142 dprintk("nfsd: READ %s %d bytes at %d\n",
143 SVCFH_fmt(&argp->fh),
144 argp->count, argp->offset);
145
146 /* Obtain buffer pointer for payload. 19 is 1 word for
147 * status, 17 words for fattr, and 1 word for the byte count.
148 */
149
150 if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
151 char buf[RPC_MAX_ADDRBUFLEN];
152 printk(KERN_NOTICE
153 "oversized read request from %s (%d bytes)\n",
154 svc_print_addr(rqstp, buf, sizeof(buf)),
155 argp->count);
156 argp->count = NFSSVC_MAXBLKSIZE_V2;
157 }
158 svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
159
160 resp->count = argp->count;
161 nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
162 argp->offset,
163 rqstp->rq_vec, argp->vlen,
164 &resp->count);
165
166 if (nfserr) return nfserr;
167 return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
168 resp->fh.fh_dentry,
169 &resp->stat));
170 }
171
172 /*
173 * Write data to a file
174 * N.B. After this call resp->fh needs an fh_put
175 */
176 static __be32
177 nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
178 struct nfsd_attrstat *resp)
179 {
180 __be32 nfserr;
181 int stable = 1;
182
183 dprintk("nfsd: WRITE %s %d bytes at %d\n",
184 SVCFH_fmt(&argp->fh),
185 argp->len, argp->offset);
186
187 nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
188 argp->offset,
189 rqstp->rq_vec, argp->vlen,
190 argp->len,
191 &stable);
192 return nfsd_return_attrs(nfserr, resp);
193 }
194
195 /*
196 * CREATE processing is complicated. The keyword here is `overloaded.'
197 * The parent directory is kept locked between the check for existence
198 * and the actual create() call in compliance with VFS protocols.
199 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
200 */
201 static __be32
202 nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
203 struct nfsd_diropres *resp)
204 {
205 svc_fh *dirfhp = &argp->fh;
206 svc_fh *newfhp = &resp->fh;
207 struct iattr *attr = &argp->attrs;
208 struct inode *inode;
209 struct dentry *dchild;
210 int type, mode;
211 __be32 nfserr;
212 dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size);
213
214 dprintk("nfsd: CREATE %s %.*s\n",
215 SVCFH_fmt(dirfhp), argp->len, argp->name);
216
217 /* First verify the parent file handle */
218 nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, MAY_EXEC);
219 if (nfserr)
220 goto done; /* must fh_put dirfhp even on error */
221
222 /* Check for MAY_WRITE in nfsd_create if necessary */
223
224 nfserr = nfserr_acces;
225 if (!argp->len)
226 goto done;
227 nfserr = nfserr_exist;
228 if (isdotent(argp->name, argp->len))
229 goto done;
230 fh_lock_nested(dirfhp, I_MUTEX_PARENT);
231 dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
232 if (IS_ERR(dchild)) {
233 nfserr = nfserrno(PTR_ERR(dchild));
234 goto out_unlock;
235 }
236 fh_init(newfhp, NFS_FHSIZE);
237 nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
238 if (!nfserr && !dchild->d_inode)
239 nfserr = nfserr_noent;
240 dput(dchild);
241 if (nfserr) {
242 if (nfserr != nfserr_noent)
243 goto out_unlock;
244 /*
245 * If the new file handle wasn't verified, we can't tell
246 * whether the file exists or not. Time to bail ...
247 */
248 nfserr = nfserr_acces;
249 if (!newfhp->fh_dentry) {
250 printk(KERN_WARNING
251 "nfsd_proc_create: file handle not verified\n");
252 goto out_unlock;
253 }
254 }
255
256 inode = newfhp->fh_dentry->d_inode;
257
258 /* Unfudge the mode bits */
259 if (attr->ia_valid & ATTR_MODE) {
260 type = attr->ia_mode & S_IFMT;
261 mode = attr->ia_mode & ~S_IFMT;
262 if (!type) {
263 /* no type, so if target exists, assume same as that,
264 * else assume a file */
265 if (inode) {
266 type = inode->i_mode & S_IFMT;
267 switch(type) {
268 case S_IFCHR:
269 case S_IFBLK:
270 /* reserve rdev for later checking */
271 rdev = inode->i_rdev;
272 attr->ia_valid |= ATTR_SIZE;
273
274 /* FALLTHROUGH */
275 case S_IFIFO:
276 /* this is probably a permission check..
277 * at least IRIX implements perm checking on
278 * echo thing > device-special-file-or-pipe
279 * by doing a CREATE with type==0
280 */
281 nfserr = nfsd_permission(rqstp,
282 newfhp->fh_export,
283 newfhp->fh_dentry,
284 MAY_WRITE|MAY_LOCAL_ACCESS);
285 if (nfserr && nfserr != nfserr_rofs)
286 goto out_unlock;
287 }
288 } else
289 type = S_IFREG;
290 }
291 } else if (inode) {
292 type = inode->i_mode & S_IFMT;
293 mode = inode->i_mode & ~S_IFMT;
294 } else {
295 type = S_IFREG;
296 mode = 0; /* ??? */
297 }
298
299 attr->ia_valid |= ATTR_MODE;
300 attr->ia_mode = mode;
301
302 /* Special treatment for non-regular files according to the
303 * gospel of sun micro
304 */
305 if (type != S_IFREG) {
306 int is_borc = 0;
307 if (type != S_IFBLK && type != S_IFCHR) {
308 rdev = 0;
309 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
310 /* If you think you've seen the worst, grok this. */
311 type = S_IFIFO;
312 } else {
313 /* Okay, char or block special */
314 is_borc = 1;
315 if (!rdev)
316 rdev = wanted;
317 }
318
319 /* we've used the SIZE information, so discard it */
320 attr->ia_valid &= ~ATTR_SIZE;
321
322 /* Make sure the type and device matches */
323 nfserr = nfserr_exist;
324 if (inode && type != (inode->i_mode & S_IFMT))
325 goto out_unlock;
326 }
327
328 nfserr = 0;
329 if (!inode) {
330 /* File doesn't exist. Create it and set attrs */
331 nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len,
332 attr, type, rdev, newfhp);
333 } else if (type == S_IFREG) {
334 dprintk("nfsd: existing %s, valid=%x, size=%ld\n",
335 argp->name, attr->ia_valid, (long) attr->ia_size);
336 /* File already exists. We ignore all attributes except
337 * size, so that creat() behaves exactly like
338 * open(..., O_CREAT|O_TRUNC|O_WRONLY).
339 */
340 attr->ia_valid &= ATTR_SIZE;
341 if (attr->ia_valid)
342 nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
343 }
344
345 out_unlock:
346 /* We don't really need to unlock, as fh_put does it. */
347 fh_unlock(dirfhp);
348
349 done:
350 fh_put(dirfhp);
351 return nfsd_return_dirop(nfserr, resp);
352 }
353
354 static __be32
355 nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
356 void *resp)
357 {
358 __be32 nfserr;
359
360 dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh),
361 argp->len, argp->name);
362
363 /* Unlink. -SIFDIR means file must not be a directory */
364 nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
365 fh_put(&argp->fh);
366 return nfserr;
367 }
368
369 static __be32
370 nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
371 void *resp)
372 {
373 __be32 nfserr;
374
375 dprintk("nfsd: RENAME %s %.*s -> \n",
376 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
377 dprintk("nfsd: -> %s %.*s\n",
378 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
379
380 nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
381 &argp->tfh, argp->tname, argp->tlen);
382 fh_put(&argp->ffh);
383 fh_put(&argp->tfh);
384 return nfserr;
385 }
386
387 static __be32
388 nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
389 void *resp)
390 {
391 __be32 nfserr;
392
393 dprintk("nfsd: LINK %s ->\n",
394 SVCFH_fmt(&argp->ffh));
395 dprintk("nfsd: %s %.*s\n",
396 SVCFH_fmt(&argp->tfh),
397 argp->tlen,
398 argp->tname);
399
400 nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
401 &argp->ffh);
402 fh_put(&argp->ffh);
403 fh_put(&argp->tfh);
404 return nfserr;
405 }
406
407 static __be32
408 nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
409 void *resp)
410 {
411 struct svc_fh newfh;
412 __be32 nfserr;
413
414 dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n",
415 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
416 argp->tlen, argp->tname);
417
418 fh_init(&newfh, NFS_FHSIZE);
419 /*
420 * Create the link, look up new file and set attrs.
421 */
422 nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
423 argp->tname, argp->tlen,
424 &newfh, &argp->attrs);
425
426
427 fh_put(&argp->ffh);
428 fh_put(&newfh);
429 return nfserr;
430 }
431
432 /*
433 * Make directory. This operation is not idempotent.
434 * N.B. After this call resp->fh needs an fh_put
435 */
436 static __be32
437 nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
438 struct nfsd_diropres *resp)
439 {
440 __be32 nfserr;
441
442 dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
443
444 if (resp->fh.fh_dentry) {
445 printk(KERN_WARNING
446 "nfsd_proc_mkdir: response already verified??\n");
447 }
448
449 argp->attrs.ia_valid &= ~ATTR_SIZE;
450 fh_init(&resp->fh, NFS_FHSIZE);
451 nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
452 &argp->attrs, S_IFDIR, 0, &resp->fh);
453 fh_put(&argp->fh);
454 return nfsd_return_dirop(nfserr, resp);
455 }
456
457 /*
458 * Remove a directory
459 */
460 static __be32
461 nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
462 void *resp)
463 {
464 __be32 nfserr;
465
466 dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
467
468 nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
469 fh_put(&argp->fh);
470 return nfserr;
471 }
472
473 /*
474 * Read a portion of a directory.
475 */
476 static __be32
477 nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
478 struct nfsd_readdirres *resp)
479 {
480 int count;
481 __be32 nfserr;
482 loff_t offset;
483
484 dprintk("nfsd: READDIR %s %d bytes at %d\n",
485 SVCFH_fmt(&argp->fh),
486 argp->count, argp->cookie);
487
488 /* Shrink to the client read size */
489 count = (argp->count >> 2) - 2;
490
491 /* Make sure we've room for the NULL ptr & eof flag */
492 count -= 2;
493 if (count < 0)
494 count = 0;
495
496 resp->buffer = argp->buffer;
497 resp->offset = NULL;
498 resp->buflen = count;
499 resp->common.err = nfs_ok;
500 /* Read directory and encode entries on the fly */
501 offset = argp->cookie;
502 nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
503 &resp->common, nfssvc_encode_entry);
504
505 resp->count = resp->buffer - argp->buffer;
506 if (resp->offset)
507 *resp->offset = htonl(offset);
508
509 fh_put(&argp->fh);
510 return nfserr;
511 }
512
513 /*
514 * Get file system info
515 */
516 static __be32
517 nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle *argp,
518 struct nfsd_statfsres *resp)
519 {
520 __be32 nfserr;
521
522 dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh));
523
524 nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats);
525 fh_put(&argp->fh);
526 return nfserr;
527 }
528
529 /*
530 * NFSv2 Server procedures.
531 * Only the results of non-idempotent operations are cached.
532 */
533 #define nfsd_proc_none NULL
534 #define nfssvc_release_none NULL
535 struct nfsd_void { int dummy; };
536
537 #define PROC(name, argt, rest, relt, cache, respsize) \
538 { (svc_procfunc) nfsd_proc_##name, \
539 (kxdrproc_t) nfssvc_decode_##argt, \
540 (kxdrproc_t) nfssvc_encode_##rest, \
541 (kxdrproc_t) nfssvc_release_##relt, \
542 sizeof(struct nfsd_##argt), \
543 sizeof(struct nfsd_##rest), \
544 0, \
545 cache, \
546 respsize, \
547 }
548
549 #define ST 1 /* status */
550 #define FH 8 /* filehandle */
551 #define AT 18 /* attributes */
552
553 static struct svc_procedure nfsd_procedures2[18] = {
554 PROC(null, void, void, none, RC_NOCACHE, ST),
555 PROC(getattr, fhandle, attrstat, fhandle, RC_NOCACHE, ST+AT),
556 PROC(setattr, sattrargs, attrstat, fhandle, RC_REPLBUFF, ST+AT),
557 PROC(none, void, void, none, RC_NOCACHE, ST),
558 PROC(lookup, diropargs, diropres, fhandle, RC_NOCACHE, ST+FH+AT),
559 PROC(readlink, readlinkargs, readlinkres, none, RC_NOCACHE, ST+1+NFS_MAXPATHLEN/4),
560 PROC(read, readargs, readres, fhandle, RC_NOCACHE, ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4),
561 PROC(none, void, void, none, RC_NOCACHE, ST),
562 PROC(write, writeargs, attrstat, fhandle, RC_REPLBUFF, ST+AT),
563 PROC(create, createargs, diropres, fhandle, RC_REPLBUFF, ST+FH+AT),
564 PROC(remove, diropargs, void, none, RC_REPLSTAT, ST),
565 PROC(rename, renameargs, void, none, RC_REPLSTAT, ST),
566 PROC(link, linkargs, void, none, RC_REPLSTAT, ST),
567 PROC(symlink, symlinkargs, void, none, RC_REPLSTAT, ST),
568 PROC(mkdir, createargs, diropres, fhandle, RC_REPLBUFF, ST+FH+AT),
569 PROC(rmdir, diropargs, void, none, RC_REPLSTAT, ST),
570 PROC(readdir, readdirargs, readdirres, none, RC_NOCACHE, 0),
571 PROC(statfs, fhandle, statfsres, none, RC_NOCACHE, ST+5),
572 };
573
574
575 struct svc_version nfsd_version2 = {
576 .vs_vers = 2,
577 .vs_nproc = 18,
578 .vs_proc = nfsd_procedures2,
579 .vs_dispatch = nfsd_dispatch,
580 .vs_xdrsize = NFS2_SVC_XDRSIZE,
581 };
582
583 /*
584 * Map errnos to NFS errnos.
585 */
586 __be32
587 nfserrno (int errno)
588 {
589 static struct {
590 __be32 nfserr;
591 int syserr;
592 } nfs_errtbl[] = {
593 { nfs_ok, 0 },
594 { nfserr_perm, -EPERM },
595 { nfserr_noent, -ENOENT },
596 { nfserr_io, -EIO },
597 { nfserr_nxio, -ENXIO },
598 { nfserr_acces, -EACCES },
599 { nfserr_exist, -EEXIST },
600 { nfserr_xdev, -EXDEV },
601 { nfserr_mlink, -EMLINK },
602 { nfserr_nodev, -ENODEV },
603 { nfserr_notdir, -ENOTDIR },
604 { nfserr_isdir, -EISDIR },
605 { nfserr_inval, -EINVAL },
606 { nfserr_fbig, -EFBIG },
607 { nfserr_nospc, -ENOSPC },
608 { nfserr_rofs, -EROFS },
609 { nfserr_mlink, -EMLINK },
610 { nfserr_nametoolong, -ENAMETOOLONG },
611 { nfserr_notempty, -ENOTEMPTY },
612 #ifdef EDQUOT
613 { nfserr_dquot, -EDQUOT },
614 #endif
615 { nfserr_stale, -ESTALE },
616 { nfserr_jukebox, -ETIMEDOUT },
617 { nfserr_dropit, -EAGAIN },
618 { nfserr_dropit, -ENOMEM },
619 { nfserr_badname, -ESRCH },
620 { nfserr_io, -ETXTBSY },
621 { nfserr_notsupp, -EOPNOTSUPP },
622 };
623 int i;
624
625 for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
626 if (nfs_errtbl[i].syserr == errno)
627 return nfs_errtbl[i].nfserr;
628 }
629 printk (KERN_INFO "nfsd: non-standard errno: %d\n", errno);
630 return nfserr_io;
631 }
632
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