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