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1/*
2 * Process version 2 NFS requests.
3 *
4 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
5 */
6
7#include <linux/namei.h>
8
9#include "cache.h"
10#include "xdr.h"
11#include "vfs.h"
12
13typedef struct svc_rqst svc_rqst;
14typedef struct svc_buf svc_buf;
15
16#define NFSDDBG_FACILITY NFSDDBG_PROC
17
18
19static __be32
20nfsd_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
21{
22 return nfs_ok;
23}
24
25static __be32
26nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp)
27{
28 if (err) return err;
29 return fh_getattr(&resp->fh, &resp->stat);
30}
31static __be32
32nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
33{
34 if (err) return err;
35 return fh_getattr(&resp->fh, &resp->stat);
36}
37/*
38 * Get a file's attributes
39 * N.B. After this call resp->fh needs an fh_put
40 */
41static __be32
42nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle *argp,
43 struct nfsd_attrstat *resp)
44{
45 __be32 nfserr;
46 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
47
48 fh_copy(&resp->fh, &argp->fh);
49 nfserr = fh_verify(rqstp, &resp->fh, 0,
50 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
51 return nfsd_return_attrs(nfserr, resp);
52}
53
54/*
55 * Set a file's attributes
56 * N.B. After this call resp->fh needs an fh_put
57 */
58static __be32
59nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp,
60 struct nfsd_attrstat *resp)
61{
62 __be32 nfserr;
63 dprintk("nfsd: SETATTR %s, valid=%x, size=%ld\n",
64 SVCFH_fmt(&argp->fh),
65 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
66
67 fh_copy(&resp->fh, &argp->fh);
68 nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,0, (time_t)0);
69 return nfsd_return_attrs(nfserr, resp);
70}
71
72/*
73 * Look up a path name component
74 * Note: the dentry in the resp->fh may be negative if the file
75 * doesn't exist yet.
76 * N.B. After this call resp->fh needs an fh_put
77 */
78static __be32
79nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
80 struct nfsd_diropres *resp)
81{
82 __be32 nfserr;
83
84 dprintk("nfsd: LOOKUP %s %.*s\n",
85 SVCFH_fmt(&argp->fh), argp->len, argp->name);
86
87 fh_init(&resp->fh, NFS_FHSIZE);
88 nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
89 &resp->fh);
90
91 fh_put(&argp->fh);
92 return nfsd_return_dirop(nfserr, resp);
93}
94
95/*
96 * Read a symlink.
97 */
98static __be32
99nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
100 struct nfsd_readlinkres *resp)
101{
102 __be32 nfserr;
103
104 dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
105
106 /* Read the symlink. */
107 resp->len = NFS_MAXPATHLEN;
108 nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
109
110 fh_put(&argp->fh);
111 return nfserr;
112}
113
114/*
115 * Read a portion of a file.
116 * N.B. After this call resp->fh needs an fh_put
117 */
118static __be32
119nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
120 struct nfsd_readres *resp)
121{
122 __be32 nfserr;
123
124 dprintk("nfsd: READ %s %d bytes at %d\n",
125 SVCFH_fmt(&argp->fh),
126 argp->count, argp->offset);
127
128 /* Obtain buffer pointer for payload. 19 is 1 word for
129 * status, 17 words for fattr, and 1 word for the byte count.
130 */
131
132 if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
133 char buf[RPC_MAX_ADDRBUFLEN];
134 printk(KERN_NOTICE
135 "oversized read request from %s (%d bytes)\n",
136 svc_print_addr(rqstp, buf, sizeof(buf)),
137 argp->count);
138 argp->count = NFSSVC_MAXBLKSIZE_V2;
139 }
140 svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
141
142 resp->count = argp->count;
143 nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
144 argp->offset,
145 rqstp->rq_vec, argp->vlen,
146 &resp->count);
147
148 if (nfserr) return nfserr;
149 return fh_getattr(&resp->fh, &resp->stat);
150}
151
152/*
153 * Write data to a file
154 * N.B. After this call resp->fh needs an fh_put
155 */
156static __be32
157nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
158 struct nfsd_attrstat *resp)
159{
160 __be32 nfserr;
161 int stable = 1;
162 unsigned long cnt = argp->len;
163
164 dprintk("nfsd: WRITE %s %d bytes at %d\n",
165 SVCFH_fmt(&argp->fh),
166 argp->len, argp->offset);
167
168 nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
169 argp->offset,
170 rqstp->rq_vec, argp->vlen,
171 &cnt,
172 &stable);
173 return nfsd_return_attrs(nfserr, resp);
174}
175
176/*
177 * CREATE processing is complicated. The keyword here is `overloaded.'
178 * The parent directory is kept locked between the check for existence
179 * and the actual create() call in compliance with VFS protocols.
180 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
181 */
182static __be32
183nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
184 struct nfsd_diropres *resp)
185{
186 svc_fh *dirfhp = &argp->fh;
187 svc_fh *newfhp = &resp->fh;
188 struct iattr *attr = &argp->attrs;
189 struct inode *inode;
190 struct dentry *dchild;
191 int type, mode;
192 __be32 nfserr;
193 int hosterr;
194 dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size);
195
196 dprintk("nfsd: CREATE %s %.*s\n",
197 SVCFH_fmt(dirfhp), argp->len, argp->name);
198
199 /* First verify the parent file handle */
200 nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
201 if (nfserr)
202 goto done; /* must fh_put dirfhp even on error */
203
204 /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
205
206 nfserr = nfserr_acces;
207 if (!argp->len)
208 goto done;
209 nfserr = nfserr_exist;
210 if (isdotent(argp->name, argp->len))
211 goto done;
212 hosterr = fh_want_write(dirfhp);
213 if (hosterr) {
214 nfserr = nfserrno(hosterr);
215 goto done;
216 }
217
218 fh_lock_nested(dirfhp, I_MUTEX_PARENT);
219 dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
220 if (IS_ERR(dchild)) {
221 nfserr = nfserrno(PTR_ERR(dchild));
222 goto out_unlock;
223 }
224 fh_init(newfhp, NFS_FHSIZE);
225 nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
226 if (!nfserr && !dchild->d_inode)
227 nfserr = nfserr_noent;
228 dput(dchild);
229 if (nfserr) {
230 if (nfserr != nfserr_noent)
231 goto out_unlock;
232 /*
233 * If the new file handle wasn't verified, we can't tell
234 * whether the file exists or not. Time to bail ...
235 */
236 nfserr = nfserr_acces;
237 if (!newfhp->fh_dentry) {
238 printk(KERN_WARNING
239 "nfsd_proc_create: file handle not verified\n");
240 goto out_unlock;
241 }
242 }
243
244 inode = newfhp->fh_dentry->d_inode;
245
246 /* Unfudge the mode bits */
247 if (attr->ia_valid & ATTR_MODE) {
248 type = attr->ia_mode & S_IFMT;
249 mode = attr->ia_mode & ~S_IFMT;
250 if (!type) {
251 /* no type, so if target exists, assume same as that,
252 * else assume a file */
253 if (inode) {
254 type = inode->i_mode & S_IFMT;
255 switch(type) {
256 case S_IFCHR:
257 case S_IFBLK:
258 /* reserve rdev for later checking */
259 rdev = inode->i_rdev;
260 attr->ia_valid |= ATTR_SIZE;
261
262 /* FALLTHROUGH */
263 case S_IFIFO:
264 /* this is probably a permission check..
265 * at least IRIX implements perm checking on
266 * echo thing > device-special-file-or-pipe
267 * by doing a CREATE with type==0
268 */
269 nfserr = nfsd_permission(rqstp,
270 newfhp->fh_export,
271 newfhp->fh_dentry,
272 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
273 if (nfserr && nfserr != nfserr_rofs)
274 goto out_unlock;
275 }
276 } else
277 type = S_IFREG;
278 }
279 } else if (inode) {
280 type = inode->i_mode & S_IFMT;
281 mode = inode->i_mode & ~S_IFMT;
282 } else {
283 type = S_IFREG;
284 mode = 0; /* ??? */
285 }
286
287 attr->ia_valid |= ATTR_MODE;
288 attr->ia_mode = mode;
289
290 /* Special treatment for non-regular files according to the
291 * gospel of sun micro
292 */
293 if (type != S_IFREG) {
294 if (type != S_IFBLK && type != S_IFCHR) {
295 rdev = 0;
296 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
297 /* If you think you've seen the worst, grok this. */
298 type = S_IFIFO;
299 } else {
300 /* Okay, char or block special */
301 if (!rdev)
302 rdev = wanted;
303 }
304
305 /* we've used the SIZE information, so discard it */
306 attr->ia_valid &= ~ATTR_SIZE;
307
308 /* Make sure the type and device matches */
309 nfserr = nfserr_exist;
310 if (inode && type != (inode->i_mode & S_IFMT))
311 goto out_unlock;
312 }
313
314 nfserr = 0;
315 if (!inode) {
316 /* File doesn't exist. Create it and set attrs */
317 nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len,
318 attr, type, rdev, newfhp);
319 } else if (type == S_IFREG) {
320 dprintk("nfsd: existing %s, valid=%x, size=%ld\n",
321 argp->name, attr->ia_valid, (long) attr->ia_size);
322 /* File already exists. We ignore all attributes except
323 * size, so that creat() behaves exactly like
324 * open(..., O_CREAT|O_TRUNC|O_WRONLY).
325 */
326 attr->ia_valid &= ATTR_SIZE;
327 if (attr->ia_valid)
328 nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
329 }
330
331out_unlock:
332 /* We don't really need to unlock, as fh_put does it. */
333 fh_unlock(dirfhp);
334 fh_drop_write(dirfhp);
335done:
336 fh_put(dirfhp);
337 return nfsd_return_dirop(nfserr, resp);
338}
339
340static __be32
341nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
342 void *resp)
343{
344 __be32 nfserr;
345
346 dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh),
347 argp->len, argp->name);
348
349 /* Unlink. -SIFDIR means file must not be a directory */
350 nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
351 fh_put(&argp->fh);
352 return nfserr;
353}
354
355static __be32
356nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
357 void *resp)
358{
359 __be32 nfserr;
360
361 dprintk("nfsd: RENAME %s %.*s -> \n",
362 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
363 dprintk("nfsd: -> %s %.*s\n",
364 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
365
366 nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
367 &argp->tfh, argp->tname, argp->tlen);
368 fh_put(&argp->ffh);
369 fh_put(&argp->tfh);
370 return nfserr;
371}
372
373static __be32
374nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
375 void *resp)
376{
377 __be32 nfserr;
378
379 dprintk("nfsd: LINK %s ->\n",
380 SVCFH_fmt(&argp->ffh));
381 dprintk("nfsd: %s %.*s\n",
382 SVCFH_fmt(&argp->tfh),
383 argp->tlen,
384 argp->tname);
385
386 nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
387 &argp->ffh);
388 fh_put(&argp->ffh);
389 fh_put(&argp->tfh);
390 return nfserr;
391}
392
393static __be32
394nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
395 void *resp)
396{
397 struct svc_fh newfh;
398 __be32 nfserr;
399
400 dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n",
401 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
402 argp->tlen, argp->tname);
403
404 fh_init(&newfh, NFS_FHSIZE);
405 /*
406 * Create the link, look up new file and set attrs.
407 */
408 nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
409 argp->tname, argp->tlen,
410 &newfh, &argp->attrs);
411
412
413 fh_put(&argp->ffh);
414 fh_put(&newfh);
415 return nfserr;
416}
417
418/*
419 * Make directory. This operation is not idempotent.
420 * N.B. After this call resp->fh needs an fh_put
421 */
422static __be32
423nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
424 struct nfsd_diropres *resp)
425{
426 __be32 nfserr;
427
428 dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
429
430 if (resp->fh.fh_dentry) {
431 printk(KERN_WARNING
432 "nfsd_proc_mkdir: response already verified??\n");
433 }
434
435 argp->attrs.ia_valid &= ~ATTR_SIZE;
436 fh_init(&resp->fh, NFS_FHSIZE);
437 nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
438 &argp->attrs, S_IFDIR, 0, &resp->fh);
439 fh_put(&argp->fh);
440 return nfsd_return_dirop(nfserr, resp);
441}
442
443/*
444 * Remove a directory
445 */
446static __be32
447nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
448 void *resp)
449{
450 __be32 nfserr;
451
452 dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
453
454 nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
455 fh_put(&argp->fh);
456 return nfserr;
457}
458
459/*
460 * Read a portion of a directory.
461 */
462static __be32
463nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
464 struct nfsd_readdirres *resp)
465{
466 int count;
467 __be32 nfserr;
468 loff_t offset;
469
470 dprintk("nfsd: READDIR %s %d bytes at %d\n",
471 SVCFH_fmt(&argp->fh),
472 argp->count, argp->cookie);
473
474 /* Shrink to the client read size */
475 count = (argp->count >> 2) - 2;
476
477 /* Make sure we've room for the NULL ptr & eof flag */
478 count -= 2;
479 if (count < 0)
480 count = 0;
481
482 resp->buffer = argp->buffer;
483 resp->offset = NULL;
484 resp->buflen = count;
485 resp->common.err = nfs_ok;
486 /* Read directory and encode entries on the fly */
487 offset = argp->cookie;
488 nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
489 &resp->common, nfssvc_encode_entry);
490
491 resp->count = resp->buffer - argp->buffer;
492 if (resp->offset)
493 *resp->offset = htonl(offset);
494
495 fh_put(&argp->fh);
496 return nfserr;
497}
498
499/*
500 * Get file system info
501 */
502static __be32
503nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle *argp,
504 struct nfsd_statfsres *resp)
505{
506 __be32 nfserr;
507
508 dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh));
509
510 nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
511 NFSD_MAY_BYPASS_GSS_ON_ROOT);
512 fh_put(&argp->fh);
513 return nfserr;
514}
515
516/*
517 * NFSv2 Server procedures.
518 * Only the results of non-idempotent operations are cached.
519 */
520struct nfsd_void { int dummy; };
521
522#define ST 1 /* status */
523#define FH 8 /* filehandle */
524#define AT 18 /* attributes */
525
526static struct svc_procedure nfsd_procedures2[18] = {
527 [NFSPROC_NULL] = {
528 .pc_func = (svc_procfunc) nfsd_proc_null,
529 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
530 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
531 .pc_argsize = sizeof(struct nfsd_void),
532 .pc_ressize = sizeof(struct nfsd_void),
533 .pc_cachetype = RC_NOCACHE,
534 .pc_xdrressize = ST,
535 },
536 [NFSPROC_GETATTR] = {
537 .pc_func = (svc_procfunc) nfsd_proc_getattr,
538 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
539 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
540 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
541 .pc_argsize = sizeof(struct nfsd_fhandle),
542 .pc_ressize = sizeof(struct nfsd_attrstat),
543 .pc_cachetype = RC_NOCACHE,
544 .pc_xdrressize = ST+AT,
545 },
546 [NFSPROC_SETATTR] = {
547 .pc_func = (svc_procfunc) nfsd_proc_setattr,
548 .pc_decode = (kxdrproc_t) nfssvc_decode_sattrargs,
549 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
550 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
551 .pc_argsize = sizeof(struct nfsd_sattrargs),
552 .pc_ressize = sizeof(struct nfsd_attrstat),
553 .pc_cachetype = RC_REPLBUFF,
554 .pc_xdrressize = ST+AT,
555 },
556 [NFSPROC_ROOT] = {
557 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
558 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
559 .pc_argsize = sizeof(struct nfsd_void),
560 .pc_ressize = sizeof(struct nfsd_void),
561 .pc_cachetype = RC_NOCACHE,
562 .pc_xdrressize = ST,
563 },
564 [NFSPROC_LOOKUP] = {
565 .pc_func = (svc_procfunc) nfsd_proc_lookup,
566 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
567 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
568 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
569 .pc_argsize = sizeof(struct nfsd_diropargs),
570 .pc_ressize = sizeof(struct nfsd_diropres),
571 .pc_cachetype = RC_NOCACHE,
572 .pc_xdrressize = ST+FH+AT,
573 },
574 [NFSPROC_READLINK] = {
575 .pc_func = (svc_procfunc) nfsd_proc_readlink,
576 .pc_decode = (kxdrproc_t) nfssvc_decode_readlinkargs,
577 .pc_encode = (kxdrproc_t) nfssvc_encode_readlinkres,
578 .pc_argsize = sizeof(struct nfsd_readlinkargs),
579 .pc_ressize = sizeof(struct nfsd_readlinkres),
580 .pc_cachetype = RC_NOCACHE,
581 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
582 },
583 [NFSPROC_READ] = {
584 .pc_func = (svc_procfunc) nfsd_proc_read,
585 .pc_decode = (kxdrproc_t) nfssvc_decode_readargs,
586 .pc_encode = (kxdrproc_t) nfssvc_encode_readres,
587 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
588 .pc_argsize = sizeof(struct nfsd_readargs),
589 .pc_ressize = sizeof(struct nfsd_readres),
590 .pc_cachetype = RC_NOCACHE,
591 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
592 },
593 [NFSPROC_WRITECACHE] = {
594 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
595 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
596 .pc_argsize = sizeof(struct nfsd_void),
597 .pc_ressize = sizeof(struct nfsd_void),
598 .pc_cachetype = RC_NOCACHE,
599 .pc_xdrressize = ST,
600 },
601 [NFSPROC_WRITE] = {
602 .pc_func = (svc_procfunc) nfsd_proc_write,
603 .pc_decode = (kxdrproc_t) nfssvc_decode_writeargs,
604 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
605 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
606 .pc_argsize = sizeof(struct nfsd_writeargs),
607 .pc_ressize = sizeof(struct nfsd_attrstat),
608 .pc_cachetype = RC_REPLBUFF,
609 .pc_xdrressize = ST+AT,
610 },
611 [NFSPROC_CREATE] = {
612 .pc_func = (svc_procfunc) nfsd_proc_create,
613 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
614 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
615 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
616 .pc_argsize = sizeof(struct nfsd_createargs),
617 .pc_ressize = sizeof(struct nfsd_diropres),
618 .pc_cachetype = RC_REPLBUFF,
619 .pc_xdrressize = ST+FH+AT,
620 },
621 [NFSPROC_REMOVE] = {
622 .pc_func = (svc_procfunc) nfsd_proc_remove,
623 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
624 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
625 .pc_argsize = sizeof(struct nfsd_diropargs),
626 .pc_ressize = sizeof(struct nfsd_void),
627 .pc_cachetype = RC_REPLSTAT,
628 .pc_xdrressize = ST,
629 },
630 [NFSPROC_RENAME] = {
631 .pc_func = (svc_procfunc) nfsd_proc_rename,
632 .pc_decode = (kxdrproc_t) nfssvc_decode_renameargs,
633 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
634 .pc_argsize = sizeof(struct nfsd_renameargs),
635 .pc_ressize = sizeof(struct nfsd_void),
636 .pc_cachetype = RC_REPLSTAT,
637 .pc_xdrressize = ST,
638 },
639 [NFSPROC_LINK] = {
640 .pc_func = (svc_procfunc) nfsd_proc_link,
641 .pc_decode = (kxdrproc_t) nfssvc_decode_linkargs,
642 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
643 .pc_argsize = sizeof(struct nfsd_linkargs),
644 .pc_ressize = sizeof(struct nfsd_void),
645 .pc_cachetype = RC_REPLSTAT,
646 .pc_xdrressize = ST,
647 },
648 [NFSPROC_SYMLINK] = {
649 .pc_func = (svc_procfunc) nfsd_proc_symlink,
650 .pc_decode = (kxdrproc_t) nfssvc_decode_symlinkargs,
651 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
652 .pc_argsize = sizeof(struct nfsd_symlinkargs),
653 .pc_ressize = sizeof(struct nfsd_void),
654 .pc_cachetype = RC_REPLSTAT,
655 .pc_xdrressize = ST,
656 },
657 [NFSPROC_MKDIR] = {
658 .pc_func = (svc_procfunc) nfsd_proc_mkdir,
659 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
660 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
661 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
662 .pc_argsize = sizeof(struct nfsd_createargs),
663 .pc_ressize = sizeof(struct nfsd_diropres),
664 .pc_cachetype = RC_REPLBUFF,
665 .pc_xdrressize = ST+FH+AT,
666 },
667 [NFSPROC_RMDIR] = {
668 .pc_func = (svc_procfunc) nfsd_proc_rmdir,
669 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
670 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
671 .pc_argsize = sizeof(struct nfsd_diropargs),
672 .pc_ressize = sizeof(struct nfsd_void),
673 .pc_cachetype = RC_REPLSTAT,
674 .pc_xdrressize = ST,
675 },
676 [NFSPROC_READDIR] = {
677 .pc_func = (svc_procfunc) nfsd_proc_readdir,
678 .pc_decode = (kxdrproc_t) nfssvc_decode_readdirargs,
679 .pc_encode = (kxdrproc_t) nfssvc_encode_readdirres,
680 .pc_argsize = sizeof(struct nfsd_readdirargs),
681 .pc_ressize = sizeof(struct nfsd_readdirres),
682 .pc_cachetype = RC_NOCACHE,
683 },
684 [NFSPROC_STATFS] = {
685 .pc_func = (svc_procfunc) nfsd_proc_statfs,
686 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
687 .pc_encode = (kxdrproc_t) nfssvc_encode_statfsres,
688 .pc_argsize = sizeof(struct nfsd_fhandle),
689 .pc_ressize = sizeof(struct nfsd_statfsres),
690 .pc_cachetype = RC_NOCACHE,
691 .pc_xdrressize = ST+5,
692 },
693};
694
695
696struct svc_version nfsd_version2 = {
697 .vs_vers = 2,
698 .vs_nproc = 18,
699 .vs_proc = nfsd_procedures2,
700 .vs_dispatch = nfsd_dispatch,
701 .vs_xdrsize = NFS2_SVC_XDRSIZE,
702};
703
704/*
705 * Map errnos to NFS errnos.
706 */
707__be32
708nfserrno (int errno)
709{
710 static struct {
711 __be32 nfserr;
712 int syserr;
713 } nfs_errtbl[] = {
714 { nfs_ok, 0 },
715 { nfserr_perm, -EPERM },
716 { nfserr_noent, -ENOENT },
717 { nfserr_io, -EIO },
718 { nfserr_nxio, -ENXIO },
719 { nfserr_acces, -EACCES },
720 { nfserr_exist, -EEXIST },
721 { nfserr_xdev, -EXDEV },
722 { nfserr_mlink, -EMLINK },
723 { nfserr_nodev, -ENODEV },
724 { nfserr_notdir, -ENOTDIR },
725 { nfserr_isdir, -EISDIR },
726 { nfserr_inval, -EINVAL },
727 { nfserr_fbig, -EFBIG },
728 { nfserr_nospc, -ENOSPC },
729 { nfserr_rofs, -EROFS },
730 { nfserr_mlink, -EMLINK },
731 { nfserr_nametoolong, -ENAMETOOLONG },
732 { nfserr_notempty, -ENOTEMPTY },
733#ifdef EDQUOT
734 { nfserr_dquot, -EDQUOT },
735#endif
736 { nfserr_stale, -ESTALE },
737 { nfserr_jukebox, -ETIMEDOUT },
738 { nfserr_jukebox, -ERESTARTSYS },
739 { nfserr_jukebox, -EAGAIN },
740 { nfserr_jukebox, -EWOULDBLOCK },
741 { nfserr_jukebox, -ENOMEM },
742 { nfserr_io, -ETXTBSY },
743 { nfserr_notsupp, -EOPNOTSUPP },
744 { nfserr_toosmall, -ETOOSMALL },
745 { nfserr_serverfault, -ESERVERFAULT },
746 };
747 int i;
748
749 for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
750 if (nfs_errtbl[i].syserr == errno)
751 return nfs_errtbl[i].nfserr;
752 }
753 printk (KERN_INFO "nfsd: non-standard errno: %d\n", errno);
754 return nfserr_io;
755}
756
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Process version 2 NFS requests.
4 *
5 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
6 */
7
8#include <linux/namei.h>
9
10#include "cache.h"
11#include "xdr.h"
12#include "vfs.h"
13
14typedef struct svc_rqst svc_rqst;
15typedef struct svc_buf svc_buf;
16
17#define NFSDDBG_FACILITY NFSDDBG_PROC
18
19
20static __be32
21nfsd_proc_null(struct svc_rqst *rqstp)
22{
23 return nfs_ok;
24}
25
26static __be32
27nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp)
28{
29 if (err) return err;
30 return fh_getattr(&resp->fh, &resp->stat);
31}
32static __be32
33nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
34{
35 if (err) return err;
36 return fh_getattr(&resp->fh, &resp->stat);
37}
38/*
39 * Get a file's attributes
40 * N.B. After this call resp->fh needs an fh_put
41 */
42static __be32
43nfsd_proc_getattr(struct svc_rqst *rqstp)
44{
45 struct nfsd_fhandle *argp = rqstp->rq_argp;
46 struct nfsd_attrstat *resp = rqstp->rq_resp;
47 __be32 nfserr;
48 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
49
50 fh_copy(&resp->fh, &argp->fh);
51 nfserr = fh_verify(rqstp, &resp->fh, 0,
52 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
53 return nfsd_return_attrs(nfserr, resp);
54}
55
56/*
57 * Set a file's attributes
58 * N.B. After this call resp->fh needs an fh_put
59 */
60static __be32
61nfsd_proc_setattr(struct svc_rqst *rqstp)
62{
63 struct nfsd_sattrargs *argp = rqstp->rq_argp;
64 struct nfsd_attrstat *resp = rqstp->rq_resp;
65 struct iattr *iap = &argp->attrs;
66 struct svc_fh *fhp;
67 __be32 nfserr;
68
69 dprintk("nfsd: SETATTR %s, valid=%x, size=%ld\n",
70 SVCFH_fmt(&argp->fh),
71 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
72
73 fhp = fh_copy(&resp->fh, &argp->fh);
74
75 /*
76 * NFSv2 does not differentiate between "set-[ac]time-to-now"
77 * which only requires access, and "set-[ac]time-to-X" which
78 * requires ownership.
79 * So if it looks like it might be "set both to the same time which
80 * is close to now", and if setattr_prepare fails, then we
81 * convert to "set to now" instead of "set to explicit time"
82 *
83 * We only call setattr_prepare as the last test as technically
84 * it is not an interface that we should be using.
85 */
86#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
87#define MAX_TOUCH_TIME_ERROR (30*60)
88 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
89 iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
90 /*
91 * Looks probable.
92 *
93 * Now just make sure time is in the right ballpark.
94 * Solaris, at least, doesn't seem to care what the time
95 * request is. We require it be within 30 minutes of now.
96 */
97 time_t delta = iap->ia_atime.tv_sec - get_seconds();
98
99 nfserr = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
100 if (nfserr)
101 goto done;
102
103 if (delta < 0)
104 delta = -delta;
105 if (delta < MAX_TOUCH_TIME_ERROR &&
106 setattr_prepare(fhp->fh_dentry, iap) != 0) {
107 /*
108 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
109 * This will cause notify_change to set these times
110 * to "now"
111 */
112 iap->ia_valid &= ~BOTH_TIME_SET;
113 }
114 }
115
116 nfserr = nfsd_setattr(rqstp, fhp, iap, 0, (time_t)0);
117done:
118 return nfsd_return_attrs(nfserr, resp);
119}
120
121/*
122 * Look up a path name component
123 * Note: the dentry in the resp->fh may be negative if the file
124 * doesn't exist yet.
125 * N.B. After this call resp->fh needs an fh_put
126 */
127static __be32
128nfsd_proc_lookup(struct svc_rqst *rqstp)
129{
130 struct nfsd_diropargs *argp = rqstp->rq_argp;
131 struct nfsd_diropres *resp = rqstp->rq_resp;
132 __be32 nfserr;
133
134 dprintk("nfsd: LOOKUP %s %.*s\n",
135 SVCFH_fmt(&argp->fh), argp->len, argp->name);
136
137 fh_init(&resp->fh, NFS_FHSIZE);
138 nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
139 &resp->fh);
140
141 fh_put(&argp->fh);
142 return nfsd_return_dirop(nfserr, resp);
143}
144
145/*
146 * Read a symlink.
147 */
148static __be32
149nfsd_proc_readlink(struct svc_rqst *rqstp)
150{
151 struct nfsd_readlinkargs *argp = rqstp->rq_argp;
152 struct nfsd_readlinkres *resp = rqstp->rq_resp;
153 __be32 nfserr;
154
155 dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
156
157 /* Read the symlink. */
158 resp->len = NFS_MAXPATHLEN;
159 nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
160
161 fh_put(&argp->fh);
162 return nfserr;
163}
164
165/*
166 * Read a portion of a file.
167 * N.B. After this call resp->fh needs an fh_put
168 */
169static __be32
170nfsd_proc_read(struct svc_rqst *rqstp)
171{
172 struct nfsd_readargs *argp = rqstp->rq_argp;
173 struct nfsd_readres *resp = rqstp->rq_resp;
174 __be32 nfserr;
175
176 dprintk("nfsd: READ %s %d bytes at %d\n",
177 SVCFH_fmt(&argp->fh),
178 argp->count, argp->offset);
179
180 /* Obtain buffer pointer for payload. 19 is 1 word for
181 * status, 17 words for fattr, and 1 word for the byte count.
182 */
183
184 if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
185 char buf[RPC_MAX_ADDRBUFLEN];
186 printk(KERN_NOTICE
187 "oversized read request from %s (%d bytes)\n",
188 svc_print_addr(rqstp, buf, sizeof(buf)),
189 argp->count);
190 argp->count = NFSSVC_MAXBLKSIZE_V2;
191 }
192 svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
193
194 resp->count = argp->count;
195 nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
196 argp->offset,
197 rqstp->rq_vec, argp->vlen,
198 &resp->count);
199
200 if (nfserr) return nfserr;
201 return fh_getattr(&resp->fh, &resp->stat);
202}
203
204/*
205 * Write data to a file
206 * N.B. After this call resp->fh needs an fh_put
207 */
208static __be32
209nfsd_proc_write(struct svc_rqst *rqstp)
210{
211 struct nfsd_writeargs *argp = rqstp->rq_argp;
212 struct nfsd_attrstat *resp = rqstp->rq_resp;
213 __be32 nfserr;
214 unsigned long cnt = argp->len;
215 unsigned int nvecs;
216
217 dprintk("nfsd: WRITE %s %d bytes at %d\n",
218 SVCFH_fmt(&argp->fh),
219 argp->len, argp->offset);
220
221 nvecs = svc_fill_write_vector(rqstp, &argp->first, cnt);
222 if (!nvecs)
223 return nfserr_io;
224 nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh),
225 argp->offset, rqstp->rq_vec, nvecs,
226 &cnt, NFS_DATA_SYNC);
227 return nfsd_return_attrs(nfserr, resp);
228}
229
230/*
231 * CREATE processing is complicated. The keyword here is `overloaded.'
232 * The parent directory is kept locked between the check for existence
233 * and the actual create() call in compliance with VFS protocols.
234 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
235 */
236static __be32
237nfsd_proc_create(struct svc_rqst *rqstp)
238{
239 struct nfsd_createargs *argp = rqstp->rq_argp;
240 struct nfsd_diropres *resp = rqstp->rq_resp;
241 svc_fh *dirfhp = &argp->fh;
242 svc_fh *newfhp = &resp->fh;
243 struct iattr *attr = &argp->attrs;
244 struct inode *inode;
245 struct dentry *dchild;
246 int type, mode;
247 __be32 nfserr;
248 int hosterr;
249 dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size);
250
251 dprintk("nfsd: CREATE %s %.*s\n",
252 SVCFH_fmt(dirfhp), argp->len, argp->name);
253
254 /* First verify the parent file handle */
255 nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
256 if (nfserr)
257 goto done; /* must fh_put dirfhp even on error */
258
259 /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
260
261 nfserr = nfserr_exist;
262 if (isdotent(argp->name, argp->len))
263 goto done;
264 hosterr = fh_want_write(dirfhp);
265 if (hosterr) {
266 nfserr = nfserrno(hosterr);
267 goto done;
268 }
269
270 fh_lock_nested(dirfhp, I_MUTEX_PARENT);
271 dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
272 if (IS_ERR(dchild)) {
273 nfserr = nfserrno(PTR_ERR(dchild));
274 goto out_unlock;
275 }
276 fh_init(newfhp, NFS_FHSIZE);
277 nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
278 if (!nfserr && d_really_is_negative(dchild))
279 nfserr = nfserr_noent;
280 dput(dchild);
281 if (nfserr) {
282 if (nfserr != nfserr_noent)
283 goto out_unlock;
284 /*
285 * If the new file handle wasn't verified, we can't tell
286 * whether the file exists or not. Time to bail ...
287 */
288 nfserr = nfserr_acces;
289 if (!newfhp->fh_dentry) {
290 printk(KERN_WARNING
291 "nfsd_proc_create: file handle not verified\n");
292 goto out_unlock;
293 }
294 }
295
296 inode = d_inode(newfhp->fh_dentry);
297
298 /* Unfudge the mode bits */
299 if (attr->ia_valid & ATTR_MODE) {
300 type = attr->ia_mode & S_IFMT;
301 mode = attr->ia_mode & ~S_IFMT;
302 if (!type) {
303 /* no type, so if target exists, assume same as that,
304 * else assume a file */
305 if (inode) {
306 type = inode->i_mode & S_IFMT;
307 switch(type) {
308 case S_IFCHR:
309 case S_IFBLK:
310 /* reserve rdev for later checking */
311 rdev = inode->i_rdev;
312 attr->ia_valid |= ATTR_SIZE;
313
314 /* FALLTHROUGH */
315 case S_IFIFO:
316 /* this is probably a permission check..
317 * at least IRIX implements perm checking on
318 * echo thing > device-special-file-or-pipe
319 * by doing a CREATE with type==0
320 */
321 nfserr = nfsd_permission(rqstp,
322 newfhp->fh_export,
323 newfhp->fh_dentry,
324 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
325 if (nfserr && nfserr != nfserr_rofs)
326 goto out_unlock;
327 }
328 } else
329 type = S_IFREG;
330 }
331 } else if (inode) {
332 type = inode->i_mode & S_IFMT;
333 mode = inode->i_mode & ~S_IFMT;
334 } else {
335 type = S_IFREG;
336 mode = 0; /* ??? */
337 }
338
339 attr->ia_valid |= ATTR_MODE;
340 attr->ia_mode = mode;
341
342 /* Special treatment for non-regular files according to the
343 * gospel of sun micro
344 */
345 if (type != S_IFREG) {
346 if (type != S_IFBLK && type != S_IFCHR) {
347 rdev = 0;
348 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
349 /* If you think you've seen the worst, grok this. */
350 type = S_IFIFO;
351 } else {
352 /* Okay, char or block special */
353 if (!rdev)
354 rdev = wanted;
355 }
356
357 /* we've used the SIZE information, so discard it */
358 attr->ia_valid &= ~ATTR_SIZE;
359
360 /* Make sure the type and device matches */
361 nfserr = nfserr_exist;
362 if (inode && type != (inode->i_mode & S_IFMT))
363 goto out_unlock;
364 }
365
366 nfserr = 0;
367 if (!inode) {
368 /* File doesn't exist. Create it and set attrs */
369 nfserr = nfsd_create_locked(rqstp, dirfhp, argp->name,
370 argp->len, attr, type, rdev, newfhp);
371 } else if (type == S_IFREG) {
372 dprintk("nfsd: existing %s, valid=%x, size=%ld\n",
373 argp->name, attr->ia_valid, (long) attr->ia_size);
374 /* File already exists. We ignore all attributes except
375 * size, so that creat() behaves exactly like
376 * open(..., O_CREAT|O_TRUNC|O_WRONLY).
377 */
378 attr->ia_valid &= ATTR_SIZE;
379 if (attr->ia_valid)
380 nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
381 }
382
383out_unlock:
384 /* We don't really need to unlock, as fh_put does it. */
385 fh_unlock(dirfhp);
386 fh_drop_write(dirfhp);
387done:
388 fh_put(dirfhp);
389 return nfsd_return_dirop(nfserr, resp);
390}
391
392static __be32
393nfsd_proc_remove(struct svc_rqst *rqstp)
394{
395 struct nfsd_diropargs *argp = rqstp->rq_argp;
396 __be32 nfserr;
397
398 dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh),
399 argp->len, argp->name);
400
401 /* Unlink. -SIFDIR means file must not be a directory */
402 nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
403 fh_put(&argp->fh);
404 return nfserr;
405}
406
407static __be32
408nfsd_proc_rename(struct svc_rqst *rqstp)
409{
410 struct nfsd_renameargs *argp = rqstp->rq_argp;
411 __be32 nfserr;
412
413 dprintk("nfsd: RENAME %s %.*s -> \n",
414 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
415 dprintk("nfsd: -> %s %.*s\n",
416 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
417
418 nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
419 &argp->tfh, argp->tname, argp->tlen);
420 fh_put(&argp->ffh);
421 fh_put(&argp->tfh);
422 return nfserr;
423}
424
425static __be32
426nfsd_proc_link(struct svc_rqst *rqstp)
427{
428 struct nfsd_linkargs *argp = rqstp->rq_argp;
429 __be32 nfserr;
430
431 dprintk("nfsd: LINK %s ->\n",
432 SVCFH_fmt(&argp->ffh));
433 dprintk("nfsd: %s %.*s\n",
434 SVCFH_fmt(&argp->tfh),
435 argp->tlen,
436 argp->tname);
437
438 nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
439 &argp->ffh);
440 fh_put(&argp->ffh);
441 fh_put(&argp->tfh);
442 return nfserr;
443}
444
445static __be32
446nfsd_proc_symlink(struct svc_rqst *rqstp)
447{
448 struct nfsd_symlinkargs *argp = rqstp->rq_argp;
449 struct svc_fh newfh;
450 __be32 nfserr;
451
452 if (argp->tlen > NFS_MAXPATHLEN)
453 return nfserr_nametoolong;
454
455 argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
456 argp->tlen);
457 if (IS_ERR(argp->tname))
458 return nfserrno(PTR_ERR(argp->tname));
459
460 dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n",
461 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
462 argp->tlen, argp->tname);
463
464 fh_init(&newfh, NFS_FHSIZE);
465 nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
466 argp->tname, &newfh);
467
468 fh_put(&argp->ffh);
469 fh_put(&newfh);
470 return nfserr;
471}
472
473/*
474 * Make directory. This operation is not idempotent.
475 * N.B. After this call resp->fh needs an fh_put
476 */
477static __be32
478nfsd_proc_mkdir(struct svc_rqst *rqstp)
479{
480 struct nfsd_createargs *argp = rqstp->rq_argp;
481 struct nfsd_diropres *resp = rqstp->rq_resp;
482 __be32 nfserr;
483
484 dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
485
486 if (resp->fh.fh_dentry) {
487 printk(KERN_WARNING
488 "nfsd_proc_mkdir: response already verified??\n");
489 }
490
491 argp->attrs.ia_valid &= ~ATTR_SIZE;
492 fh_init(&resp->fh, NFS_FHSIZE);
493 nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
494 &argp->attrs, S_IFDIR, 0, &resp->fh);
495 fh_put(&argp->fh);
496 return nfsd_return_dirop(nfserr, resp);
497}
498
499/*
500 * Remove a directory
501 */
502static __be32
503nfsd_proc_rmdir(struct svc_rqst *rqstp)
504{
505 struct nfsd_diropargs *argp = rqstp->rq_argp;
506 __be32 nfserr;
507
508 dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
509
510 nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
511 fh_put(&argp->fh);
512 return nfserr;
513}
514
515/*
516 * Read a portion of a directory.
517 */
518static __be32
519nfsd_proc_readdir(struct svc_rqst *rqstp)
520{
521 struct nfsd_readdirargs *argp = rqstp->rq_argp;
522 struct nfsd_readdirres *resp = rqstp->rq_resp;
523 int count;
524 __be32 nfserr;
525 loff_t offset;
526
527 dprintk("nfsd: READDIR %s %d bytes at %d\n",
528 SVCFH_fmt(&argp->fh),
529 argp->count, argp->cookie);
530
531 /* Shrink to the client read size */
532 count = (argp->count >> 2) - 2;
533
534 /* Make sure we've room for the NULL ptr & eof flag */
535 count -= 2;
536 if (count < 0)
537 count = 0;
538
539 resp->buffer = argp->buffer;
540 resp->offset = NULL;
541 resp->buflen = count;
542 resp->common.err = nfs_ok;
543 /* Read directory and encode entries on the fly */
544 offset = argp->cookie;
545 nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
546 &resp->common, nfssvc_encode_entry);
547
548 resp->count = resp->buffer - argp->buffer;
549 if (resp->offset)
550 *resp->offset = htonl(offset);
551
552 fh_put(&argp->fh);
553 return nfserr;
554}
555
556/*
557 * Get file system info
558 */
559static __be32
560nfsd_proc_statfs(struct svc_rqst *rqstp)
561{
562 struct nfsd_fhandle *argp = rqstp->rq_argp;
563 struct nfsd_statfsres *resp = rqstp->rq_resp;
564 __be32 nfserr;
565
566 dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh));
567
568 nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
569 NFSD_MAY_BYPASS_GSS_ON_ROOT);
570 fh_put(&argp->fh);
571 return nfserr;
572}
573
574/*
575 * NFSv2 Server procedures.
576 * Only the results of non-idempotent operations are cached.
577 */
578struct nfsd_void { int dummy; };
579
580#define ST 1 /* status */
581#define FH 8 /* filehandle */
582#define AT 18 /* attributes */
583
584static const struct svc_procedure nfsd_procedures2[18] = {
585 [NFSPROC_NULL] = {
586 .pc_func = nfsd_proc_null,
587 .pc_decode = nfssvc_decode_void,
588 .pc_encode = nfssvc_encode_void,
589 .pc_argsize = sizeof(struct nfsd_void),
590 .pc_ressize = sizeof(struct nfsd_void),
591 .pc_cachetype = RC_NOCACHE,
592 .pc_xdrressize = ST,
593 },
594 [NFSPROC_GETATTR] = {
595 .pc_func = nfsd_proc_getattr,
596 .pc_decode = nfssvc_decode_fhandle,
597 .pc_encode = nfssvc_encode_attrstat,
598 .pc_release = nfssvc_release_fhandle,
599 .pc_argsize = sizeof(struct nfsd_fhandle),
600 .pc_ressize = sizeof(struct nfsd_attrstat),
601 .pc_cachetype = RC_NOCACHE,
602 .pc_xdrressize = ST+AT,
603 },
604 [NFSPROC_SETATTR] = {
605 .pc_func = nfsd_proc_setattr,
606 .pc_decode = nfssvc_decode_sattrargs,
607 .pc_encode = nfssvc_encode_attrstat,
608 .pc_release = nfssvc_release_fhandle,
609 .pc_argsize = sizeof(struct nfsd_sattrargs),
610 .pc_ressize = sizeof(struct nfsd_attrstat),
611 .pc_cachetype = RC_REPLBUFF,
612 .pc_xdrressize = ST+AT,
613 },
614 [NFSPROC_ROOT] = {
615 .pc_decode = nfssvc_decode_void,
616 .pc_encode = nfssvc_encode_void,
617 .pc_argsize = sizeof(struct nfsd_void),
618 .pc_ressize = sizeof(struct nfsd_void),
619 .pc_cachetype = RC_NOCACHE,
620 .pc_xdrressize = ST,
621 },
622 [NFSPROC_LOOKUP] = {
623 .pc_func = nfsd_proc_lookup,
624 .pc_decode = nfssvc_decode_diropargs,
625 .pc_encode = nfssvc_encode_diropres,
626 .pc_release = nfssvc_release_fhandle,
627 .pc_argsize = sizeof(struct nfsd_diropargs),
628 .pc_ressize = sizeof(struct nfsd_diropres),
629 .pc_cachetype = RC_NOCACHE,
630 .pc_xdrressize = ST+FH+AT,
631 },
632 [NFSPROC_READLINK] = {
633 .pc_func = nfsd_proc_readlink,
634 .pc_decode = nfssvc_decode_readlinkargs,
635 .pc_encode = nfssvc_encode_readlinkres,
636 .pc_argsize = sizeof(struct nfsd_readlinkargs),
637 .pc_ressize = sizeof(struct nfsd_readlinkres),
638 .pc_cachetype = RC_NOCACHE,
639 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
640 },
641 [NFSPROC_READ] = {
642 .pc_func = nfsd_proc_read,
643 .pc_decode = nfssvc_decode_readargs,
644 .pc_encode = nfssvc_encode_readres,
645 .pc_release = nfssvc_release_fhandle,
646 .pc_argsize = sizeof(struct nfsd_readargs),
647 .pc_ressize = sizeof(struct nfsd_readres),
648 .pc_cachetype = RC_NOCACHE,
649 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
650 },
651 [NFSPROC_WRITECACHE] = {
652 .pc_decode = nfssvc_decode_void,
653 .pc_encode = nfssvc_encode_void,
654 .pc_argsize = sizeof(struct nfsd_void),
655 .pc_ressize = sizeof(struct nfsd_void),
656 .pc_cachetype = RC_NOCACHE,
657 .pc_xdrressize = ST,
658 },
659 [NFSPROC_WRITE] = {
660 .pc_func = nfsd_proc_write,
661 .pc_decode = nfssvc_decode_writeargs,
662 .pc_encode = nfssvc_encode_attrstat,
663 .pc_release = nfssvc_release_fhandle,
664 .pc_argsize = sizeof(struct nfsd_writeargs),
665 .pc_ressize = sizeof(struct nfsd_attrstat),
666 .pc_cachetype = RC_REPLBUFF,
667 .pc_xdrressize = ST+AT,
668 },
669 [NFSPROC_CREATE] = {
670 .pc_func = nfsd_proc_create,
671 .pc_decode = nfssvc_decode_createargs,
672 .pc_encode = nfssvc_encode_diropres,
673 .pc_release = nfssvc_release_fhandle,
674 .pc_argsize = sizeof(struct nfsd_createargs),
675 .pc_ressize = sizeof(struct nfsd_diropres),
676 .pc_cachetype = RC_REPLBUFF,
677 .pc_xdrressize = ST+FH+AT,
678 },
679 [NFSPROC_REMOVE] = {
680 .pc_func = nfsd_proc_remove,
681 .pc_decode = nfssvc_decode_diropargs,
682 .pc_encode = nfssvc_encode_void,
683 .pc_argsize = sizeof(struct nfsd_diropargs),
684 .pc_ressize = sizeof(struct nfsd_void),
685 .pc_cachetype = RC_REPLSTAT,
686 .pc_xdrressize = ST,
687 },
688 [NFSPROC_RENAME] = {
689 .pc_func = nfsd_proc_rename,
690 .pc_decode = nfssvc_decode_renameargs,
691 .pc_encode = nfssvc_encode_void,
692 .pc_argsize = sizeof(struct nfsd_renameargs),
693 .pc_ressize = sizeof(struct nfsd_void),
694 .pc_cachetype = RC_REPLSTAT,
695 .pc_xdrressize = ST,
696 },
697 [NFSPROC_LINK] = {
698 .pc_func = nfsd_proc_link,
699 .pc_decode = nfssvc_decode_linkargs,
700 .pc_encode = nfssvc_encode_void,
701 .pc_argsize = sizeof(struct nfsd_linkargs),
702 .pc_ressize = sizeof(struct nfsd_void),
703 .pc_cachetype = RC_REPLSTAT,
704 .pc_xdrressize = ST,
705 },
706 [NFSPROC_SYMLINK] = {
707 .pc_func = nfsd_proc_symlink,
708 .pc_decode = nfssvc_decode_symlinkargs,
709 .pc_encode = nfssvc_encode_void,
710 .pc_argsize = sizeof(struct nfsd_symlinkargs),
711 .pc_ressize = sizeof(struct nfsd_void),
712 .pc_cachetype = RC_REPLSTAT,
713 .pc_xdrressize = ST,
714 },
715 [NFSPROC_MKDIR] = {
716 .pc_func = nfsd_proc_mkdir,
717 .pc_decode = nfssvc_decode_createargs,
718 .pc_encode = nfssvc_encode_diropres,
719 .pc_release = nfssvc_release_fhandle,
720 .pc_argsize = sizeof(struct nfsd_createargs),
721 .pc_ressize = sizeof(struct nfsd_diropres),
722 .pc_cachetype = RC_REPLBUFF,
723 .pc_xdrressize = ST+FH+AT,
724 },
725 [NFSPROC_RMDIR] = {
726 .pc_func = nfsd_proc_rmdir,
727 .pc_decode = nfssvc_decode_diropargs,
728 .pc_encode = nfssvc_encode_void,
729 .pc_argsize = sizeof(struct nfsd_diropargs),
730 .pc_ressize = sizeof(struct nfsd_void),
731 .pc_cachetype = RC_REPLSTAT,
732 .pc_xdrressize = ST,
733 },
734 [NFSPROC_READDIR] = {
735 .pc_func = nfsd_proc_readdir,
736 .pc_decode = nfssvc_decode_readdirargs,
737 .pc_encode = nfssvc_encode_readdirres,
738 .pc_argsize = sizeof(struct nfsd_readdirargs),
739 .pc_ressize = sizeof(struct nfsd_readdirres),
740 .pc_cachetype = RC_NOCACHE,
741 },
742 [NFSPROC_STATFS] = {
743 .pc_func = nfsd_proc_statfs,
744 .pc_decode = nfssvc_decode_fhandle,
745 .pc_encode = nfssvc_encode_statfsres,
746 .pc_argsize = sizeof(struct nfsd_fhandle),
747 .pc_ressize = sizeof(struct nfsd_statfsres),
748 .pc_cachetype = RC_NOCACHE,
749 .pc_xdrressize = ST+5,
750 },
751};
752
753
754static unsigned int nfsd_count2[ARRAY_SIZE(nfsd_procedures2)];
755const struct svc_version nfsd_version2 = {
756 .vs_vers = 2,
757 .vs_nproc = 18,
758 .vs_proc = nfsd_procedures2,
759 .vs_count = nfsd_count2,
760 .vs_dispatch = nfsd_dispatch,
761 .vs_xdrsize = NFS2_SVC_XDRSIZE,
762};
763
764/*
765 * Map errnos to NFS errnos.
766 */
767__be32
768nfserrno (int errno)
769{
770 static struct {
771 __be32 nfserr;
772 int syserr;
773 } nfs_errtbl[] = {
774 { nfs_ok, 0 },
775 { nfserr_perm, -EPERM },
776 { nfserr_noent, -ENOENT },
777 { nfserr_io, -EIO },
778 { nfserr_nxio, -ENXIO },
779 { nfserr_fbig, -E2BIG },
780 { nfserr_acces, -EACCES },
781 { nfserr_exist, -EEXIST },
782 { nfserr_xdev, -EXDEV },
783 { nfserr_mlink, -EMLINK },
784 { nfserr_nodev, -ENODEV },
785 { nfserr_notdir, -ENOTDIR },
786 { nfserr_isdir, -EISDIR },
787 { nfserr_inval, -EINVAL },
788 { nfserr_fbig, -EFBIG },
789 { nfserr_nospc, -ENOSPC },
790 { nfserr_rofs, -EROFS },
791 { nfserr_mlink, -EMLINK },
792 { nfserr_nametoolong, -ENAMETOOLONG },
793 { nfserr_notempty, -ENOTEMPTY },
794#ifdef EDQUOT
795 { nfserr_dquot, -EDQUOT },
796#endif
797 { nfserr_stale, -ESTALE },
798 { nfserr_jukebox, -ETIMEDOUT },
799 { nfserr_jukebox, -ERESTARTSYS },
800 { nfserr_jukebox, -EAGAIN },
801 { nfserr_jukebox, -EWOULDBLOCK },
802 { nfserr_jukebox, -ENOMEM },
803 { nfserr_io, -ETXTBSY },
804 { nfserr_notsupp, -EOPNOTSUPP },
805 { nfserr_toosmall, -ETOOSMALL },
806 { nfserr_serverfault, -ESERVERFAULT },
807 { nfserr_serverfault, -ENFILE },
808 { nfserr_io, -EUCLEAN },
809 { nfserr_perm, -ENOKEY },
810 };
811 int i;
812
813 for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
814 if (nfs_errtbl[i].syserr == errno)
815 return nfs_errtbl[i].nfserr;
816 }
817 WARN_ONCE(1, "nfsd: non-standard errno: %d\n", errno);
818 return nfserr_io;
819}
820