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