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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
14#define NFSDDBG_FACILITY NFSDDBG_PROC
15
16static __be32 nfsd_map_status(__be32 status)
17{
18 switch (status) {
19 case nfs_ok:
20 break;
21 case nfserr_nofilehandle:
22 case nfserr_badhandle:
23 status = nfserr_stale;
24 break;
25 case nfserr_wrongsec:
26 case nfserr_xdev:
27 case nfserr_file_open:
28 status = nfserr_acces;
29 break;
30 case nfserr_symlink_not_dir:
31 status = nfserr_notdir;
32 break;
33 case nfserr_symlink:
34 case nfserr_wrong_type:
35 status = nfserr_inval;
36 break;
37 }
38 return status;
39}
40
41static __be32
42nfsd_proc_null(struct svc_rqst *rqstp)
43{
44 return rpc_success;
45}
46
47/*
48 * Get a file's attributes
49 * N.B. After this call resp->fh needs an fh_put
50 */
51static __be32
52nfsd_proc_getattr(struct svc_rqst *rqstp)
53{
54 struct nfsd_fhandle *argp = rqstp->rq_argp;
55 struct nfsd_attrstat *resp = rqstp->rq_resp;
56
57 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
58
59 fh_copy(&resp->fh, &argp->fh);
60 resp->status = fh_verify(rqstp, &resp->fh, 0,
61 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
62 if (resp->status != nfs_ok)
63 goto out;
64 resp->status = fh_getattr(&resp->fh, &resp->stat);
65out:
66 resp->status = nfsd_map_status(resp->status);
67 return rpc_success;
68}
69
70/*
71 * Set a file's attributes
72 * N.B. After this call resp->fh needs an fh_put
73 */
74static __be32
75nfsd_proc_setattr(struct svc_rqst *rqstp)
76{
77 struct nfsd_sattrargs *argp = rqstp->rq_argp;
78 struct nfsd_attrstat *resp = rqstp->rq_resp;
79 struct iattr *iap = &argp->attrs;
80 struct nfsd_attrs attrs = {
81 .na_iattr = iap,
82 };
83 struct svc_fh *fhp;
84
85 dprintk("nfsd: SETATTR %s, valid=%x, size=%ld\n",
86 SVCFH_fmt(&argp->fh),
87 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
88
89 fhp = fh_copy(&resp->fh, &argp->fh);
90
91 /*
92 * NFSv2 does not differentiate between "set-[ac]time-to-now"
93 * which only requires access, and "set-[ac]time-to-X" which
94 * requires ownership.
95 * So if it looks like it might be "set both to the same time which
96 * is close to now", and if setattr_prepare fails, then we
97 * convert to "set to now" instead of "set to explicit time"
98 *
99 * We only call setattr_prepare as the last test as technically
100 * it is not an interface that we should be using.
101 */
102#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
103#define MAX_TOUCH_TIME_ERROR (30*60)
104 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
105 iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
106 /*
107 * Looks probable.
108 *
109 * Now just make sure time is in the right ballpark.
110 * Solaris, at least, doesn't seem to care what the time
111 * request is. We require it be within 30 minutes of now.
112 */
113 time64_t delta = iap->ia_atime.tv_sec - ktime_get_real_seconds();
114
115 resp->status = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
116 if (resp->status != nfs_ok)
117 goto out;
118
119 if (delta < 0)
120 delta = -delta;
121 if (delta < MAX_TOUCH_TIME_ERROR &&
122 setattr_prepare(&nop_mnt_idmap, fhp->fh_dentry, iap) != 0) {
123 /*
124 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
125 * This will cause notify_change to set these times
126 * to "now"
127 */
128 iap->ia_valid &= ~BOTH_TIME_SET;
129 }
130 }
131
132 resp->status = nfsd_setattr(rqstp, fhp, &attrs, NULL);
133 if (resp->status != nfs_ok)
134 goto out;
135
136 resp->status = fh_getattr(&resp->fh, &resp->stat);
137out:
138 resp->status = nfsd_map_status(resp->status);
139 return rpc_success;
140}
141
142/* Obsolete, replaced by MNTPROC_MNT. */
143static __be32
144nfsd_proc_root(struct svc_rqst *rqstp)
145{
146 return rpc_success;
147}
148
149/*
150 * Look up a path name component
151 * Note: the dentry in the resp->fh may be negative if the file
152 * doesn't exist yet.
153 * N.B. After this call resp->fh needs an fh_put
154 */
155static __be32
156nfsd_proc_lookup(struct svc_rqst *rqstp)
157{
158 struct nfsd_diropargs *argp = rqstp->rq_argp;
159 struct nfsd_diropres *resp = rqstp->rq_resp;
160
161 dprintk("nfsd: LOOKUP %s %.*s\n",
162 SVCFH_fmt(&argp->fh), argp->len, argp->name);
163
164 fh_init(&resp->fh, NFS_FHSIZE);
165 resp->status = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
166 &resp->fh);
167 fh_put(&argp->fh);
168 if (resp->status != nfs_ok)
169 goto out;
170
171 resp->status = fh_getattr(&resp->fh, &resp->stat);
172out:
173 resp->status = nfsd_map_status(resp->status);
174 return rpc_success;
175}
176
177/*
178 * Read a symlink.
179 */
180static __be32
181nfsd_proc_readlink(struct svc_rqst *rqstp)
182{
183 struct nfsd_fhandle *argp = rqstp->rq_argp;
184 struct nfsd_readlinkres *resp = rqstp->rq_resp;
185
186 dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
187
188 /* Read the symlink. */
189 resp->len = NFS_MAXPATHLEN;
190 resp->page = *(rqstp->rq_next_page++);
191 resp->status = nfsd_readlink(rqstp, &argp->fh,
192 page_address(resp->page), &resp->len);
193
194 fh_put(&argp->fh);
195 resp->status = nfsd_map_status(resp->status);
196 return rpc_success;
197}
198
199/*
200 * Read a portion of a file.
201 * N.B. After this call resp->fh needs an fh_put
202 */
203static __be32
204nfsd_proc_read(struct svc_rqst *rqstp)
205{
206 struct nfsd_readargs *argp = rqstp->rq_argp;
207 struct nfsd_readres *resp = rqstp->rq_resp;
208 u32 eof;
209
210 dprintk("nfsd: READ %s %d bytes at %d\n",
211 SVCFH_fmt(&argp->fh),
212 argp->count, argp->offset);
213
214 argp->count = min_t(u32, argp->count, NFSSVC_MAXBLKSIZE_V2);
215 argp->count = min_t(u32, argp->count, rqstp->rq_res.buflen);
216
217 resp->pages = rqstp->rq_next_page;
218
219 /* Obtain buffer pointer for payload. 19 is 1 word for
220 * status, 17 words for fattr, and 1 word for the byte count.
221 */
222 svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
223
224 resp->count = argp->count;
225 fh_copy(&resp->fh, &argp->fh);
226 resp->status = nfsd_read(rqstp, &resp->fh, argp->offset,
227 &resp->count, &eof);
228 if (resp->status == nfs_ok)
229 resp->status = fh_getattr(&resp->fh, &resp->stat);
230 else if (resp->status == nfserr_jukebox)
231 set_bit(RQ_DROPME, &rqstp->rq_flags);
232 resp->status = nfsd_map_status(resp->status);
233 return rpc_success;
234}
235
236/* Reserved */
237static __be32
238nfsd_proc_writecache(struct svc_rqst *rqstp)
239{
240 return rpc_success;
241}
242
243/*
244 * Write data to a file
245 * N.B. After this call resp->fh needs an fh_put
246 */
247static __be32
248nfsd_proc_write(struct svc_rqst *rqstp)
249{
250 struct nfsd_writeargs *argp = rqstp->rq_argp;
251 struct nfsd_attrstat *resp = rqstp->rq_resp;
252 unsigned long cnt = argp->len;
253 unsigned int nvecs;
254
255 dprintk("nfsd: WRITE %s %u bytes at %d\n",
256 SVCFH_fmt(&argp->fh),
257 argp->len, argp->offset);
258
259 nvecs = svc_fill_write_vector(rqstp, &argp->payload);
260
261 resp->status = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh),
262 argp->offset, rqstp->rq_vec, nvecs,
263 &cnt, NFS_DATA_SYNC, NULL);
264 if (resp->status == nfs_ok)
265 resp->status = fh_getattr(&resp->fh, &resp->stat);
266 else if (resp->status == nfserr_jukebox)
267 set_bit(RQ_DROPME, &rqstp->rq_flags);
268 resp->status = nfsd_map_status(resp->status);
269 return rpc_success;
270}
271
272/*
273 * CREATE processing is complicated. The keyword here is `overloaded.'
274 * The parent directory is kept locked between the check for existence
275 * and the actual create() call in compliance with VFS protocols.
276 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
277 */
278static __be32
279nfsd_proc_create(struct svc_rqst *rqstp)
280{
281 struct nfsd_createargs *argp = rqstp->rq_argp;
282 struct nfsd_diropres *resp = rqstp->rq_resp;
283 svc_fh *dirfhp = &argp->fh;
284 svc_fh *newfhp = &resp->fh;
285 struct iattr *attr = &argp->attrs;
286 struct nfsd_attrs attrs = {
287 .na_iattr = attr,
288 };
289 struct inode *inode;
290 struct dentry *dchild;
291 int type, mode;
292 int hosterr;
293 dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size);
294
295 dprintk("nfsd: CREATE %s %.*s\n",
296 SVCFH_fmt(dirfhp), argp->len, argp->name);
297
298 /* First verify the parent file handle */
299 resp->status = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
300 if (resp->status != nfs_ok)
301 goto done; /* must fh_put dirfhp even on error */
302
303 /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
304
305 resp->status = nfserr_exist;
306 if (isdotent(argp->name, argp->len))
307 goto done;
308 hosterr = fh_want_write(dirfhp);
309 if (hosterr) {
310 resp->status = nfserrno(hosterr);
311 goto done;
312 }
313
314 inode_lock_nested(dirfhp->fh_dentry->d_inode, I_MUTEX_PARENT);
315 dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
316 if (IS_ERR(dchild)) {
317 resp->status = nfserrno(PTR_ERR(dchild));
318 goto out_unlock;
319 }
320 fh_init(newfhp, NFS_FHSIZE);
321 resp->status = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
322 if (!resp->status && d_really_is_negative(dchild))
323 resp->status = nfserr_noent;
324 dput(dchild);
325 if (resp->status) {
326 if (resp->status != nfserr_noent)
327 goto out_unlock;
328 /*
329 * If the new file handle wasn't verified, we can't tell
330 * whether the file exists or not. Time to bail ...
331 */
332 resp->status = nfserr_acces;
333 if (!newfhp->fh_dentry) {
334 printk(KERN_WARNING
335 "nfsd_proc_create: file handle not verified\n");
336 goto out_unlock;
337 }
338 }
339
340 inode = d_inode(newfhp->fh_dentry);
341
342 /* Unfudge the mode bits */
343 if (attr->ia_valid & ATTR_MODE) {
344 type = attr->ia_mode & S_IFMT;
345 mode = attr->ia_mode & ~S_IFMT;
346 if (!type) {
347 /* no type, so if target exists, assume same as that,
348 * else assume a file */
349 if (inode) {
350 type = inode->i_mode & S_IFMT;
351 switch(type) {
352 case S_IFCHR:
353 case S_IFBLK:
354 /* reserve rdev for later checking */
355 rdev = inode->i_rdev;
356 attr->ia_valid |= ATTR_SIZE;
357
358 fallthrough;
359 case S_IFIFO:
360 /* this is probably a permission check..
361 * at least IRIX implements perm checking on
362 * echo thing > device-special-file-or-pipe
363 * by doing a CREATE with type==0
364 */
365 resp->status = nfsd_permission(
366 &rqstp->rq_cred,
367 newfhp->fh_export,
368 newfhp->fh_dentry,
369 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
370 if (resp->status && resp->status != nfserr_rofs)
371 goto out_unlock;
372 }
373 } else
374 type = S_IFREG;
375 }
376 } else if (inode) {
377 type = inode->i_mode & S_IFMT;
378 mode = inode->i_mode & ~S_IFMT;
379 } else {
380 type = S_IFREG;
381 mode = 0; /* ??? */
382 }
383
384 attr->ia_valid |= ATTR_MODE;
385 attr->ia_mode = mode;
386
387 /* Special treatment for non-regular files according to the
388 * gospel of sun micro
389 */
390 if (type != S_IFREG) {
391 if (type != S_IFBLK && type != S_IFCHR) {
392 rdev = 0;
393 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
394 /* If you think you've seen the worst, grok this. */
395 type = S_IFIFO;
396 } else {
397 /* Okay, char or block special */
398 if (!rdev)
399 rdev = wanted;
400 }
401
402 /* we've used the SIZE information, so discard it */
403 attr->ia_valid &= ~ATTR_SIZE;
404
405 /* Make sure the type and device matches */
406 resp->status = nfserr_exist;
407 if (inode && inode_wrong_type(inode, type))
408 goto out_unlock;
409 }
410
411 resp->status = nfs_ok;
412 if (!inode) {
413 /* File doesn't exist. Create it and set attrs */
414 resp->status = nfsd_create_locked(rqstp, dirfhp, &attrs, type,
415 rdev, newfhp);
416 } else if (type == S_IFREG) {
417 dprintk("nfsd: existing %s, valid=%x, size=%ld\n",
418 argp->name, attr->ia_valid, (long) attr->ia_size);
419 /* File already exists. We ignore all attributes except
420 * size, so that creat() behaves exactly like
421 * open(..., O_CREAT|O_TRUNC|O_WRONLY).
422 */
423 attr->ia_valid &= ATTR_SIZE;
424 if (attr->ia_valid)
425 resp->status = nfsd_setattr(rqstp, newfhp, &attrs,
426 NULL);
427 }
428
429out_unlock:
430 inode_unlock(dirfhp->fh_dentry->d_inode);
431 fh_drop_write(dirfhp);
432done:
433 fh_put(dirfhp);
434 if (resp->status != nfs_ok)
435 goto out;
436 resp->status = fh_getattr(&resp->fh, &resp->stat);
437out:
438 resp->status = nfsd_map_status(resp->status);
439 return rpc_success;
440}
441
442static __be32
443nfsd_proc_remove(struct svc_rqst *rqstp)
444{
445 struct nfsd_diropargs *argp = rqstp->rq_argp;
446 struct nfsd_stat *resp = rqstp->rq_resp;
447
448 dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh),
449 argp->len, argp->name);
450
451 /* Unlink. -SIFDIR means file must not be a directory */
452 resp->status = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR,
453 argp->name, argp->len);
454 fh_put(&argp->fh);
455 resp->status = nfsd_map_status(resp->status);
456 return rpc_success;
457}
458
459static __be32
460nfsd_proc_rename(struct svc_rqst *rqstp)
461{
462 struct nfsd_renameargs *argp = rqstp->rq_argp;
463 struct nfsd_stat *resp = rqstp->rq_resp;
464
465 dprintk("nfsd: RENAME %s %.*s -> \n",
466 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
467 dprintk("nfsd: -> %s %.*s\n",
468 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
469
470 resp->status = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
471 &argp->tfh, argp->tname, argp->tlen);
472 fh_put(&argp->ffh);
473 fh_put(&argp->tfh);
474 resp->status = nfsd_map_status(resp->status);
475 return rpc_success;
476}
477
478static __be32
479nfsd_proc_link(struct svc_rqst *rqstp)
480{
481 struct nfsd_linkargs *argp = rqstp->rq_argp;
482 struct nfsd_stat *resp = rqstp->rq_resp;
483
484 dprintk("nfsd: LINK %s ->\n",
485 SVCFH_fmt(&argp->ffh));
486 dprintk("nfsd: %s %.*s\n",
487 SVCFH_fmt(&argp->tfh),
488 argp->tlen,
489 argp->tname);
490
491 resp->status = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
492 &argp->ffh);
493 fh_put(&argp->ffh);
494 fh_put(&argp->tfh);
495 resp->status = nfsd_map_status(resp->status);
496 return rpc_success;
497}
498
499static __be32
500nfsd_proc_symlink(struct svc_rqst *rqstp)
501{
502 struct nfsd_symlinkargs *argp = rqstp->rq_argp;
503 struct nfsd_stat *resp = rqstp->rq_resp;
504 struct nfsd_attrs attrs = {
505 .na_iattr = &argp->attrs,
506 };
507 struct svc_fh newfh;
508
509 if (argp->tlen > NFS_MAXPATHLEN) {
510 resp->status = nfserr_nametoolong;
511 goto out;
512 }
513
514 argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
515 page_address(rqstp->rq_arg.pages[0]),
516 argp->tlen);
517 if (IS_ERR(argp->tname)) {
518 resp->status = nfserrno(PTR_ERR(argp->tname));
519 goto out;
520 }
521
522 dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n",
523 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
524 argp->tlen, argp->tname);
525
526 fh_init(&newfh, NFS_FHSIZE);
527 resp->status = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
528 argp->tname, &attrs, &newfh);
529
530 kfree(argp->tname);
531 fh_put(&argp->ffh);
532 fh_put(&newfh);
533out:
534 resp->status = nfsd_map_status(resp->status);
535 return rpc_success;
536}
537
538/*
539 * Make directory. This operation is not idempotent.
540 * N.B. After this call resp->fh needs an fh_put
541 */
542static __be32
543nfsd_proc_mkdir(struct svc_rqst *rqstp)
544{
545 struct nfsd_createargs *argp = rqstp->rq_argp;
546 struct nfsd_diropres *resp = rqstp->rq_resp;
547 struct nfsd_attrs attrs = {
548 .na_iattr = &argp->attrs,
549 };
550
551 dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
552
553 if (resp->fh.fh_dentry) {
554 printk(KERN_WARNING
555 "nfsd_proc_mkdir: response already verified??\n");
556 }
557
558 argp->attrs.ia_valid &= ~ATTR_SIZE;
559 fh_init(&resp->fh, NFS_FHSIZE);
560 resp->status = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
561 &attrs, S_IFDIR, 0, &resp->fh);
562 fh_put(&argp->fh);
563 if (resp->status != nfs_ok)
564 goto out;
565
566 resp->status = fh_getattr(&resp->fh, &resp->stat);
567out:
568 resp->status = nfsd_map_status(resp->status);
569 return rpc_success;
570}
571
572/*
573 * Remove a directory
574 */
575static __be32
576nfsd_proc_rmdir(struct svc_rqst *rqstp)
577{
578 struct nfsd_diropargs *argp = rqstp->rq_argp;
579 struct nfsd_stat *resp = rqstp->rq_resp;
580
581 dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
582
583 resp->status = nfsd_unlink(rqstp, &argp->fh, S_IFDIR,
584 argp->name, argp->len);
585 fh_put(&argp->fh);
586 resp->status = nfsd_map_status(resp->status);
587 return rpc_success;
588}
589
590static void nfsd_init_dirlist_pages(struct svc_rqst *rqstp,
591 struct nfsd_readdirres *resp,
592 u32 count)
593{
594 struct xdr_buf *buf = &resp->dirlist;
595 struct xdr_stream *xdr = &resp->xdr;
596
597 memset(buf, 0, sizeof(*buf));
598
599 /* Reserve room for the NULL ptr & eof flag (-2 words) */
600 buf->buflen = clamp(count, (u32)(XDR_UNIT * 2), (u32)PAGE_SIZE);
601 buf->buflen -= XDR_UNIT * 2;
602 buf->pages = rqstp->rq_next_page;
603 rqstp->rq_next_page++;
604
605 xdr_init_encode_pages(xdr, buf, buf->pages, NULL);
606}
607
608/*
609 * Read a portion of a directory.
610 */
611static __be32
612nfsd_proc_readdir(struct svc_rqst *rqstp)
613{
614 struct nfsd_readdirargs *argp = rqstp->rq_argp;
615 struct nfsd_readdirres *resp = rqstp->rq_resp;
616 loff_t offset;
617
618 dprintk("nfsd: READDIR %s %d bytes at %d\n",
619 SVCFH_fmt(&argp->fh),
620 argp->count, argp->cookie);
621
622 nfsd_init_dirlist_pages(rqstp, resp, argp->count);
623
624 resp->common.err = nfs_ok;
625 resp->cookie_offset = 0;
626 offset = argp->cookie;
627 resp->status = nfsd_readdir(rqstp, &argp->fh, &offset,
628 &resp->common, nfssvc_encode_entry);
629 nfssvc_encode_nfscookie(resp, offset);
630
631 fh_put(&argp->fh);
632 resp->status = nfsd_map_status(resp->status);
633 return rpc_success;
634}
635
636/*
637 * Get file system info
638 */
639static __be32
640nfsd_proc_statfs(struct svc_rqst *rqstp)
641{
642 struct nfsd_fhandle *argp = rqstp->rq_argp;
643 struct nfsd_statfsres *resp = rqstp->rq_resp;
644
645 dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh));
646
647 resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
648 NFSD_MAY_BYPASS_GSS_ON_ROOT);
649 fh_put(&argp->fh);
650 resp->status = nfsd_map_status(resp->status);
651 return rpc_success;
652}
653
654/*
655 * NFSv2 Server procedures.
656 * Only the results of non-idempotent operations are cached.
657 */
658
659#define ST 1 /* status */
660#define FH 8 /* filehandle */
661#define AT 18 /* attributes */
662
663static const struct svc_procedure nfsd_procedures2[18] = {
664 [NFSPROC_NULL] = {
665 .pc_func = nfsd_proc_null,
666 .pc_decode = nfssvc_decode_voidarg,
667 .pc_encode = nfssvc_encode_voidres,
668 .pc_argsize = sizeof(struct nfsd_voidargs),
669 .pc_argzero = sizeof(struct nfsd_voidargs),
670 .pc_ressize = sizeof(struct nfsd_voidres),
671 .pc_cachetype = RC_NOCACHE,
672 .pc_xdrressize = 0,
673 .pc_name = "NULL",
674 },
675 [NFSPROC_GETATTR] = {
676 .pc_func = nfsd_proc_getattr,
677 .pc_decode = nfssvc_decode_fhandleargs,
678 .pc_encode = nfssvc_encode_attrstatres,
679 .pc_release = nfssvc_release_attrstat,
680 .pc_argsize = sizeof(struct nfsd_fhandle),
681 .pc_argzero = sizeof(struct nfsd_fhandle),
682 .pc_ressize = sizeof(struct nfsd_attrstat),
683 .pc_cachetype = RC_NOCACHE,
684 .pc_xdrressize = ST+AT,
685 .pc_name = "GETATTR",
686 },
687 [NFSPROC_SETATTR] = {
688 .pc_func = nfsd_proc_setattr,
689 .pc_decode = nfssvc_decode_sattrargs,
690 .pc_encode = nfssvc_encode_attrstatres,
691 .pc_release = nfssvc_release_attrstat,
692 .pc_argsize = sizeof(struct nfsd_sattrargs),
693 .pc_argzero = sizeof(struct nfsd_sattrargs),
694 .pc_ressize = sizeof(struct nfsd_attrstat),
695 .pc_cachetype = RC_REPLBUFF,
696 .pc_xdrressize = ST+AT,
697 .pc_name = "SETATTR",
698 },
699 [NFSPROC_ROOT] = {
700 .pc_func = nfsd_proc_root,
701 .pc_decode = nfssvc_decode_voidarg,
702 .pc_encode = nfssvc_encode_voidres,
703 .pc_argsize = sizeof(struct nfsd_voidargs),
704 .pc_argzero = sizeof(struct nfsd_voidargs),
705 .pc_ressize = sizeof(struct nfsd_voidres),
706 .pc_cachetype = RC_NOCACHE,
707 .pc_xdrressize = 0,
708 .pc_name = "ROOT",
709 },
710 [NFSPROC_LOOKUP] = {
711 .pc_func = nfsd_proc_lookup,
712 .pc_decode = nfssvc_decode_diropargs,
713 .pc_encode = nfssvc_encode_diropres,
714 .pc_release = nfssvc_release_diropres,
715 .pc_argsize = sizeof(struct nfsd_diropargs),
716 .pc_argzero = sizeof(struct nfsd_diropargs),
717 .pc_ressize = sizeof(struct nfsd_diropres),
718 .pc_cachetype = RC_NOCACHE,
719 .pc_xdrressize = ST+FH+AT,
720 .pc_name = "LOOKUP",
721 },
722 [NFSPROC_READLINK] = {
723 .pc_func = nfsd_proc_readlink,
724 .pc_decode = nfssvc_decode_fhandleargs,
725 .pc_encode = nfssvc_encode_readlinkres,
726 .pc_argsize = sizeof(struct nfsd_fhandle),
727 .pc_argzero = sizeof(struct nfsd_fhandle),
728 .pc_ressize = sizeof(struct nfsd_readlinkres),
729 .pc_cachetype = RC_NOCACHE,
730 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
731 .pc_name = "READLINK",
732 },
733 [NFSPROC_READ] = {
734 .pc_func = nfsd_proc_read,
735 .pc_decode = nfssvc_decode_readargs,
736 .pc_encode = nfssvc_encode_readres,
737 .pc_release = nfssvc_release_readres,
738 .pc_argsize = sizeof(struct nfsd_readargs),
739 .pc_argzero = sizeof(struct nfsd_readargs),
740 .pc_ressize = sizeof(struct nfsd_readres),
741 .pc_cachetype = RC_NOCACHE,
742 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
743 .pc_name = "READ",
744 },
745 [NFSPROC_WRITECACHE] = {
746 .pc_func = nfsd_proc_writecache,
747 .pc_decode = nfssvc_decode_voidarg,
748 .pc_encode = nfssvc_encode_voidres,
749 .pc_argsize = sizeof(struct nfsd_voidargs),
750 .pc_argzero = sizeof(struct nfsd_voidargs),
751 .pc_ressize = sizeof(struct nfsd_voidres),
752 .pc_cachetype = RC_NOCACHE,
753 .pc_xdrressize = 0,
754 .pc_name = "WRITECACHE",
755 },
756 [NFSPROC_WRITE] = {
757 .pc_func = nfsd_proc_write,
758 .pc_decode = nfssvc_decode_writeargs,
759 .pc_encode = nfssvc_encode_attrstatres,
760 .pc_release = nfssvc_release_attrstat,
761 .pc_argsize = sizeof(struct nfsd_writeargs),
762 .pc_argzero = sizeof(struct nfsd_writeargs),
763 .pc_ressize = sizeof(struct nfsd_attrstat),
764 .pc_cachetype = RC_REPLBUFF,
765 .pc_xdrressize = ST+AT,
766 .pc_name = "WRITE",
767 },
768 [NFSPROC_CREATE] = {
769 .pc_func = nfsd_proc_create,
770 .pc_decode = nfssvc_decode_createargs,
771 .pc_encode = nfssvc_encode_diropres,
772 .pc_release = nfssvc_release_diropres,
773 .pc_argsize = sizeof(struct nfsd_createargs),
774 .pc_argzero = sizeof(struct nfsd_createargs),
775 .pc_ressize = sizeof(struct nfsd_diropres),
776 .pc_cachetype = RC_REPLBUFF,
777 .pc_xdrressize = ST+FH+AT,
778 .pc_name = "CREATE",
779 },
780 [NFSPROC_REMOVE] = {
781 .pc_func = nfsd_proc_remove,
782 .pc_decode = nfssvc_decode_diropargs,
783 .pc_encode = nfssvc_encode_statres,
784 .pc_argsize = sizeof(struct nfsd_diropargs),
785 .pc_argzero = sizeof(struct nfsd_diropargs),
786 .pc_ressize = sizeof(struct nfsd_stat),
787 .pc_cachetype = RC_REPLSTAT,
788 .pc_xdrressize = ST,
789 .pc_name = "REMOVE",
790 },
791 [NFSPROC_RENAME] = {
792 .pc_func = nfsd_proc_rename,
793 .pc_decode = nfssvc_decode_renameargs,
794 .pc_encode = nfssvc_encode_statres,
795 .pc_argsize = sizeof(struct nfsd_renameargs),
796 .pc_argzero = sizeof(struct nfsd_renameargs),
797 .pc_ressize = sizeof(struct nfsd_stat),
798 .pc_cachetype = RC_REPLSTAT,
799 .pc_xdrressize = ST,
800 .pc_name = "RENAME",
801 },
802 [NFSPROC_LINK] = {
803 .pc_func = nfsd_proc_link,
804 .pc_decode = nfssvc_decode_linkargs,
805 .pc_encode = nfssvc_encode_statres,
806 .pc_argsize = sizeof(struct nfsd_linkargs),
807 .pc_argzero = sizeof(struct nfsd_linkargs),
808 .pc_ressize = sizeof(struct nfsd_stat),
809 .pc_cachetype = RC_REPLSTAT,
810 .pc_xdrressize = ST,
811 .pc_name = "LINK",
812 },
813 [NFSPROC_SYMLINK] = {
814 .pc_func = nfsd_proc_symlink,
815 .pc_decode = nfssvc_decode_symlinkargs,
816 .pc_encode = nfssvc_encode_statres,
817 .pc_argsize = sizeof(struct nfsd_symlinkargs),
818 .pc_argzero = sizeof(struct nfsd_symlinkargs),
819 .pc_ressize = sizeof(struct nfsd_stat),
820 .pc_cachetype = RC_REPLSTAT,
821 .pc_xdrressize = ST,
822 .pc_name = "SYMLINK",
823 },
824 [NFSPROC_MKDIR] = {
825 .pc_func = nfsd_proc_mkdir,
826 .pc_decode = nfssvc_decode_createargs,
827 .pc_encode = nfssvc_encode_diropres,
828 .pc_release = nfssvc_release_diropres,
829 .pc_argsize = sizeof(struct nfsd_createargs),
830 .pc_argzero = sizeof(struct nfsd_createargs),
831 .pc_ressize = sizeof(struct nfsd_diropres),
832 .pc_cachetype = RC_REPLBUFF,
833 .pc_xdrressize = ST+FH+AT,
834 .pc_name = "MKDIR",
835 },
836 [NFSPROC_RMDIR] = {
837 .pc_func = nfsd_proc_rmdir,
838 .pc_decode = nfssvc_decode_diropargs,
839 .pc_encode = nfssvc_encode_statres,
840 .pc_argsize = sizeof(struct nfsd_diropargs),
841 .pc_argzero = sizeof(struct nfsd_diropargs),
842 .pc_ressize = sizeof(struct nfsd_stat),
843 .pc_cachetype = RC_REPLSTAT,
844 .pc_xdrressize = ST,
845 .pc_name = "RMDIR",
846 },
847 [NFSPROC_READDIR] = {
848 .pc_func = nfsd_proc_readdir,
849 .pc_decode = nfssvc_decode_readdirargs,
850 .pc_encode = nfssvc_encode_readdirres,
851 .pc_argsize = sizeof(struct nfsd_readdirargs),
852 .pc_argzero = sizeof(struct nfsd_readdirargs),
853 .pc_ressize = sizeof(struct nfsd_readdirres),
854 .pc_cachetype = RC_NOCACHE,
855 .pc_name = "READDIR",
856 },
857 [NFSPROC_STATFS] = {
858 .pc_func = nfsd_proc_statfs,
859 .pc_decode = nfssvc_decode_fhandleargs,
860 .pc_encode = nfssvc_encode_statfsres,
861 .pc_argsize = sizeof(struct nfsd_fhandle),
862 .pc_argzero = sizeof(struct nfsd_fhandle),
863 .pc_ressize = sizeof(struct nfsd_statfsres),
864 .pc_cachetype = RC_NOCACHE,
865 .pc_xdrressize = ST+5,
866 .pc_name = "STATFS",
867 },
868};
869
870static DEFINE_PER_CPU_ALIGNED(unsigned long,
871 nfsd_count2[ARRAY_SIZE(nfsd_procedures2)]);
872const struct svc_version nfsd_version2 = {
873 .vs_vers = 2,
874 .vs_nproc = ARRAY_SIZE(nfsd_procedures2),
875 .vs_proc = nfsd_procedures2,
876 .vs_count = nfsd_count2,
877 .vs_dispatch = nfsd_dispatch,
878 .vs_xdrsize = NFS2_SVC_XDRSIZE,
879};