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