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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 struct iattr *iap = &argp->attrs;
63 struct svc_fh *fhp;
64 __be32 nfserr;
65
66 dprintk("nfsd: SETATTR %s, valid=%x, size=%ld\n",
67 SVCFH_fmt(&argp->fh),
68 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
69
70 fhp = fh_copy(&resp->fh, &argp->fh);
71
72 /*
73 * NFSv2 does not differentiate between "set-[ac]time-to-now"
74 * which only requires access, and "set-[ac]time-to-X" which
75 * requires ownership.
76 * So if it looks like it might be "set both to the same time which
77 * is close to now", and if inode_change_ok fails, then we
78 * convert to "set to now" instead of "set to explicit time"
79 *
80 * We only call inode_change_ok as the last test as technically
81 * it is not an interface that we should be using.
82 */
83#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
84#define MAX_TOUCH_TIME_ERROR (30*60)
85 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
86 iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
87 /*
88 * Looks probable.
89 *
90 * Now just make sure time is in the right ballpark.
91 * Solaris, at least, doesn't seem to care what the time
92 * request is. We require it be within 30 minutes of now.
93 */
94 time_t delta = iap->ia_atime.tv_sec - get_seconds();
95 struct inode *inode;
96
97 nfserr = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
98 if (nfserr)
99 goto done;
100 inode = d_inode(fhp->fh_dentry);
101
102 if (delta < 0)
103 delta = -delta;
104 if (delta < MAX_TOUCH_TIME_ERROR &&
105 inode_change_ok(inode, iap) != 0) {
106 /*
107 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
108 * This will cause notify_change to set these times
109 * to "now"
110 */
111 iap->ia_valid &= ~BOTH_TIME_SET;
112 }
113 }
114
115 nfserr = nfsd_setattr(rqstp, fhp, iap, 0, (time_t)0);
116done:
117 return nfsd_return_attrs(nfserr, resp);
118}
119
120/*
121 * Look up a path name component
122 * Note: the dentry in the resp->fh may be negative if the file
123 * doesn't exist yet.
124 * N.B. After this call resp->fh needs an fh_put
125 */
126static __be32
127nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
128 struct nfsd_diropres *resp)
129{
130 __be32 nfserr;
131
132 dprintk("nfsd: LOOKUP %s %.*s\n",
133 SVCFH_fmt(&argp->fh), argp->len, argp->name);
134
135 fh_init(&resp->fh, NFS_FHSIZE);
136 nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
137 &resp->fh);
138
139 fh_put(&argp->fh);
140 return nfsd_return_dirop(nfserr, resp);
141}
142
143/*
144 * Read a symlink.
145 */
146static __be32
147nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
148 struct nfsd_readlinkres *resp)
149{
150 __be32 nfserr;
151
152 dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
153
154 /* Read the symlink. */
155 resp->len = NFS_MAXPATHLEN;
156 nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
157
158 fh_put(&argp->fh);
159 return nfserr;
160}
161
162/*
163 * Read a portion of a file.
164 * N.B. After this call resp->fh needs an fh_put
165 */
166static __be32
167nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
168 struct nfsd_readres *resp)
169{
170 __be32 nfserr;
171
172 dprintk("nfsd: READ %s %d bytes at %d\n",
173 SVCFH_fmt(&argp->fh),
174 argp->count, argp->offset);
175
176 /* Obtain buffer pointer for payload. 19 is 1 word for
177 * status, 17 words for fattr, and 1 word for the byte count.
178 */
179
180 if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
181 char buf[RPC_MAX_ADDRBUFLEN];
182 printk(KERN_NOTICE
183 "oversized read request from %s (%d bytes)\n",
184 svc_print_addr(rqstp, buf, sizeof(buf)),
185 argp->count);
186 argp->count = NFSSVC_MAXBLKSIZE_V2;
187 }
188 svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
189
190 resp->count = argp->count;
191 nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
192 argp->offset,
193 rqstp->rq_vec, argp->vlen,
194 &resp->count);
195
196 if (nfserr) return nfserr;
197 return fh_getattr(&resp->fh, &resp->stat);
198}
199
200/*
201 * Write data to a file
202 * N.B. After this call resp->fh needs an fh_put
203 */
204static __be32
205nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
206 struct nfsd_attrstat *resp)
207{
208 __be32 nfserr;
209 int stable = 1;
210 unsigned long cnt = argp->len;
211
212 dprintk("nfsd: WRITE %s %d bytes at %d\n",
213 SVCFH_fmt(&argp->fh),
214 argp->len, argp->offset);
215
216 nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
217 argp->offset,
218 rqstp->rq_vec, argp->vlen,
219 &cnt,
220 &stable);
221 return nfsd_return_attrs(nfserr, resp);
222}
223
224/*
225 * CREATE processing is complicated. The keyword here is `overloaded.'
226 * The parent directory is kept locked between the check for existence
227 * and the actual create() call in compliance with VFS protocols.
228 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
229 */
230static __be32
231nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
232 struct nfsd_diropres *resp)
233{
234 svc_fh *dirfhp = &argp->fh;
235 svc_fh *newfhp = &resp->fh;
236 struct iattr *attr = &argp->attrs;
237 struct inode *inode;
238 struct dentry *dchild;
239 int type, mode;
240 __be32 nfserr;
241 int hosterr;
242 dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size);
243
244 dprintk("nfsd: CREATE %s %.*s\n",
245 SVCFH_fmt(dirfhp), argp->len, argp->name);
246
247 /* First verify the parent file handle */
248 nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
249 if (nfserr)
250 goto done; /* must fh_put dirfhp even on error */
251
252 /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
253
254 nfserr = nfserr_acces;
255 if (!argp->len)
256 goto done;
257 nfserr = nfserr_exist;
258 if (isdotent(argp->name, argp->len))
259 goto done;
260 hosterr = fh_want_write(dirfhp);
261 if (hosterr) {
262 nfserr = nfserrno(hosterr);
263 goto done;
264 }
265
266 fh_lock_nested(dirfhp, I_MUTEX_PARENT);
267 dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
268 if (IS_ERR(dchild)) {
269 nfserr = nfserrno(PTR_ERR(dchild));
270 goto out_unlock;
271 }
272 fh_init(newfhp, NFS_FHSIZE);
273 nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
274 if (!nfserr && d_really_is_negative(dchild))
275 nfserr = nfserr_noent;
276 dput(dchild);
277 if (nfserr) {
278 if (nfserr != nfserr_noent)
279 goto out_unlock;
280 /*
281 * If the new file handle wasn't verified, we can't tell
282 * whether the file exists or not. Time to bail ...
283 */
284 nfserr = nfserr_acces;
285 if (!newfhp->fh_dentry) {
286 printk(KERN_WARNING
287 "nfsd_proc_create: file handle not verified\n");
288 goto out_unlock;
289 }
290 }
291
292 inode = d_inode(newfhp->fh_dentry);
293
294 /* Unfudge the mode bits */
295 if (attr->ia_valid & ATTR_MODE) {
296 type = attr->ia_mode & S_IFMT;
297 mode = attr->ia_mode & ~S_IFMT;
298 if (!type) {
299 /* no type, so if target exists, assume same as that,
300 * else assume a file */
301 if (inode) {
302 type = inode->i_mode & S_IFMT;
303 switch(type) {
304 case S_IFCHR:
305 case S_IFBLK:
306 /* reserve rdev for later checking */
307 rdev = inode->i_rdev;
308 attr->ia_valid |= ATTR_SIZE;
309
310 /* FALLTHROUGH */
311 case S_IFIFO:
312 /* this is probably a permission check..
313 * at least IRIX implements perm checking on
314 * echo thing > device-special-file-or-pipe
315 * by doing a CREATE with type==0
316 */
317 nfserr = nfsd_permission(rqstp,
318 newfhp->fh_export,
319 newfhp->fh_dentry,
320 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
321 if (nfserr && nfserr != nfserr_rofs)
322 goto out_unlock;
323 }
324 } else
325 type = S_IFREG;
326 }
327 } else if (inode) {
328 type = inode->i_mode & S_IFMT;
329 mode = inode->i_mode & ~S_IFMT;
330 } else {
331 type = S_IFREG;
332 mode = 0; /* ??? */
333 }
334
335 attr->ia_valid |= ATTR_MODE;
336 attr->ia_mode = mode;
337
338 /* Special treatment for non-regular files according to the
339 * gospel of sun micro
340 */
341 if (type != S_IFREG) {
342 if (type != S_IFBLK && type != S_IFCHR) {
343 rdev = 0;
344 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
345 /* If you think you've seen the worst, grok this. */
346 type = S_IFIFO;
347 } else {
348 /* Okay, char or block special */
349 if (!rdev)
350 rdev = wanted;
351 }
352
353 /* we've used the SIZE information, so discard it */
354 attr->ia_valid &= ~ATTR_SIZE;
355
356 /* Make sure the type and device matches */
357 nfserr = nfserr_exist;
358 if (inode && type != (inode->i_mode & S_IFMT))
359 goto out_unlock;
360 }
361
362 nfserr = 0;
363 if (!inode) {
364 /* File doesn't exist. Create it and set attrs */
365 nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len,
366 attr, type, rdev, newfhp);
367 } else if (type == S_IFREG) {
368 dprintk("nfsd: existing %s, valid=%x, size=%ld\n",
369 argp->name, attr->ia_valid, (long) attr->ia_size);
370 /* File already exists. We ignore all attributes except
371 * size, so that creat() behaves exactly like
372 * open(..., O_CREAT|O_TRUNC|O_WRONLY).
373 */
374 attr->ia_valid &= ATTR_SIZE;
375 if (attr->ia_valid)
376 nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
377 }
378
379out_unlock:
380 /* We don't really need to unlock, as fh_put does it. */
381 fh_unlock(dirfhp);
382 fh_drop_write(dirfhp);
383done:
384 fh_put(dirfhp);
385 return nfsd_return_dirop(nfserr, resp);
386}
387
388static __be32
389nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
390 void *resp)
391{
392 __be32 nfserr;
393
394 dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh),
395 argp->len, argp->name);
396
397 /* Unlink. -SIFDIR means file must not be a directory */
398 nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
399 fh_put(&argp->fh);
400 return nfserr;
401}
402
403static __be32
404nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
405 void *resp)
406{
407 __be32 nfserr;
408
409 dprintk("nfsd: RENAME %s %.*s -> \n",
410 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
411 dprintk("nfsd: -> %s %.*s\n",
412 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
413
414 nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
415 &argp->tfh, argp->tname, argp->tlen);
416 fh_put(&argp->ffh);
417 fh_put(&argp->tfh);
418 return nfserr;
419}
420
421static __be32
422nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
423 void *resp)
424{
425 __be32 nfserr;
426
427 dprintk("nfsd: LINK %s ->\n",
428 SVCFH_fmt(&argp->ffh));
429 dprintk("nfsd: %s %.*s\n",
430 SVCFH_fmt(&argp->tfh),
431 argp->tlen,
432 argp->tname);
433
434 nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
435 &argp->ffh);
436 fh_put(&argp->ffh);
437 fh_put(&argp->tfh);
438 return nfserr;
439}
440
441static __be32
442nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
443 void *resp)
444{
445 struct svc_fh newfh;
446 __be32 nfserr;
447
448 dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n",
449 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
450 argp->tlen, argp->tname);
451
452 fh_init(&newfh, NFS_FHSIZE);
453 /*
454 * Crazy hack: the request fits in a page, and already-decoded
455 * attributes follow argp->tname, so it's safe to just write a
456 * null to ensure it's null-terminated:
457 */
458 argp->tname[argp->tlen] = '\0';
459 nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
460 argp->tname, &newfh);
461
462 fh_put(&argp->ffh);
463 fh_put(&newfh);
464 return nfserr;
465}
466
467/*
468 * Make directory. This operation is not idempotent.
469 * N.B. After this call resp->fh needs an fh_put
470 */
471static __be32
472nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
473 struct nfsd_diropres *resp)
474{
475 __be32 nfserr;
476
477 dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
478
479 if (resp->fh.fh_dentry) {
480 printk(KERN_WARNING
481 "nfsd_proc_mkdir: response already verified??\n");
482 }
483
484 argp->attrs.ia_valid &= ~ATTR_SIZE;
485 fh_init(&resp->fh, NFS_FHSIZE);
486 nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
487 &argp->attrs, S_IFDIR, 0, &resp->fh);
488 fh_put(&argp->fh);
489 return nfsd_return_dirop(nfserr, resp);
490}
491
492/*
493 * Remove a directory
494 */
495static __be32
496nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
497 void *resp)
498{
499 __be32 nfserr;
500
501 dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
502
503 nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
504 fh_put(&argp->fh);
505 return nfserr;
506}
507
508/*
509 * Read a portion of a directory.
510 */
511static __be32
512nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
513 struct nfsd_readdirres *resp)
514{
515 int count;
516 __be32 nfserr;
517 loff_t offset;
518
519 dprintk("nfsd: READDIR %s %d bytes at %d\n",
520 SVCFH_fmt(&argp->fh),
521 argp->count, argp->cookie);
522
523 /* Shrink to the client read size */
524 count = (argp->count >> 2) - 2;
525
526 /* Make sure we've room for the NULL ptr & eof flag */
527 count -= 2;
528 if (count < 0)
529 count = 0;
530
531 resp->buffer = argp->buffer;
532 resp->offset = NULL;
533 resp->buflen = count;
534 resp->common.err = nfs_ok;
535 /* Read directory and encode entries on the fly */
536 offset = argp->cookie;
537 nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
538 &resp->common, nfssvc_encode_entry);
539
540 resp->count = resp->buffer - argp->buffer;
541 if (resp->offset)
542 *resp->offset = htonl(offset);
543
544 fh_put(&argp->fh);
545 return nfserr;
546}
547
548/*
549 * Get file system info
550 */
551static __be32
552nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle *argp,
553 struct nfsd_statfsres *resp)
554{
555 __be32 nfserr;
556
557 dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh));
558
559 nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
560 NFSD_MAY_BYPASS_GSS_ON_ROOT);
561 fh_put(&argp->fh);
562 return nfserr;
563}
564
565/*
566 * NFSv2 Server procedures.
567 * Only the results of non-idempotent operations are cached.
568 */
569struct nfsd_void { int dummy; };
570
571#define ST 1 /* status */
572#define FH 8 /* filehandle */
573#define AT 18 /* attributes */
574
575static struct svc_procedure nfsd_procedures2[18] = {
576 [NFSPROC_NULL] = {
577 .pc_func = (svc_procfunc) nfsd_proc_null,
578 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
579 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
580 .pc_argsize = sizeof(struct nfsd_void),
581 .pc_ressize = sizeof(struct nfsd_void),
582 .pc_cachetype = RC_NOCACHE,
583 .pc_xdrressize = ST,
584 },
585 [NFSPROC_GETATTR] = {
586 .pc_func = (svc_procfunc) nfsd_proc_getattr,
587 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
588 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
589 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
590 .pc_argsize = sizeof(struct nfsd_fhandle),
591 .pc_ressize = sizeof(struct nfsd_attrstat),
592 .pc_cachetype = RC_NOCACHE,
593 .pc_xdrressize = ST+AT,
594 },
595 [NFSPROC_SETATTR] = {
596 .pc_func = (svc_procfunc) nfsd_proc_setattr,
597 .pc_decode = (kxdrproc_t) nfssvc_decode_sattrargs,
598 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
599 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
600 .pc_argsize = sizeof(struct nfsd_sattrargs),
601 .pc_ressize = sizeof(struct nfsd_attrstat),
602 .pc_cachetype = RC_REPLBUFF,
603 .pc_xdrressize = ST+AT,
604 },
605 [NFSPROC_ROOT] = {
606 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
607 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
608 .pc_argsize = sizeof(struct nfsd_void),
609 .pc_ressize = sizeof(struct nfsd_void),
610 .pc_cachetype = RC_NOCACHE,
611 .pc_xdrressize = ST,
612 },
613 [NFSPROC_LOOKUP] = {
614 .pc_func = (svc_procfunc) nfsd_proc_lookup,
615 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
616 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
617 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
618 .pc_argsize = sizeof(struct nfsd_diropargs),
619 .pc_ressize = sizeof(struct nfsd_diropres),
620 .pc_cachetype = RC_NOCACHE,
621 .pc_xdrressize = ST+FH+AT,
622 },
623 [NFSPROC_READLINK] = {
624 .pc_func = (svc_procfunc) nfsd_proc_readlink,
625 .pc_decode = (kxdrproc_t) nfssvc_decode_readlinkargs,
626 .pc_encode = (kxdrproc_t) nfssvc_encode_readlinkres,
627 .pc_argsize = sizeof(struct nfsd_readlinkargs),
628 .pc_ressize = sizeof(struct nfsd_readlinkres),
629 .pc_cachetype = RC_NOCACHE,
630 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
631 },
632 [NFSPROC_READ] = {
633 .pc_func = (svc_procfunc) nfsd_proc_read,
634 .pc_decode = (kxdrproc_t) nfssvc_decode_readargs,
635 .pc_encode = (kxdrproc_t) nfssvc_encode_readres,
636 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
637 .pc_argsize = sizeof(struct nfsd_readargs),
638 .pc_ressize = sizeof(struct nfsd_readres),
639 .pc_cachetype = RC_NOCACHE,
640 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
641 },
642 [NFSPROC_WRITECACHE] = {
643 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
644 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
645 .pc_argsize = sizeof(struct nfsd_void),
646 .pc_ressize = sizeof(struct nfsd_void),
647 .pc_cachetype = RC_NOCACHE,
648 .pc_xdrressize = ST,
649 },
650 [NFSPROC_WRITE] = {
651 .pc_func = (svc_procfunc) nfsd_proc_write,
652 .pc_decode = (kxdrproc_t) nfssvc_decode_writeargs,
653 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
654 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
655 .pc_argsize = sizeof(struct nfsd_writeargs),
656 .pc_ressize = sizeof(struct nfsd_attrstat),
657 .pc_cachetype = RC_REPLBUFF,
658 .pc_xdrressize = ST+AT,
659 },
660 [NFSPROC_CREATE] = {
661 .pc_func = (svc_procfunc) nfsd_proc_create,
662 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
663 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
664 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
665 .pc_argsize = sizeof(struct nfsd_createargs),
666 .pc_ressize = sizeof(struct nfsd_diropres),
667 .pc_cachetype = RC_REPLBUFF,
668 .pc_xdrressize = ST+FH+AT,
669 },
670 [NFSPROC_REMOVE] = {
671 .pc_func = (svc_procfunc) nfsd_proc_remove,
672 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
673 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
674 .pc_argsize = sizeof(struct nfsd_diropargs),
675 .pc_ressize = sizeof(struct nfsd_void),
676 .pc_cachetype = RC_REPLSTAT,
677 .pc_xdrressize = ST,
678 },
679 [NFSPROC_RENAME] = {
680 .pc_func = (svc_procfunc) nfsd_proc_rename,
681 .pc_decode = (kxdrproc_t) nfssvc_decode_renameargs,
682 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
683 .pc_argsize = sizeof(struct nfsd_renameargs),
684 .pc_ressize = sizeof(struct nfsd_void),
685 .pc_cachetype = RC_REPLSTAT,
686 .pc_xdrressize = ST,
687 },
688 [NFSPROC_LINK] = {
689 .pc_func = (svc_procfunc) nfsd_proc_link,
690 .pc_decode = (kxdrproc_t) nfssvc_decode_linkargs,
691 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
692 .pc_argsize = sizeof(struct nfsd_linkargs),
693 .pc_ressize = sizeof(struct nfsd_void),
694 .pc_cachetype = RC_REPLSTAT,
695 .pc_xdrressize = ST,
696 },
697 [NFSPROC_SYMLINK] = {
698 .pc_func = (svc_procfunc) nfsd_proc_symlink,
699 .pc_decode = (kxdrproc_t) nfssvc_decode_symlinkargs,
700 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
701 .pc_argsize = sizeof(struct nfsd_symlinkargs),
702 .pc_ressize = sizeof(struct nfsd_void),
703 .pc_cachetype = RC_REPLSTAT,
704 .pc_xdrressize = ST,
705 },
706 [NFSPROC_MKDIR] = {
707 .pc_func = (svc_procfunc) nfsd_proc_mkdir,
708 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
709 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
710 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
711 .pc_argsize = sizeof(struct nfsd_createargs),
712 .pc_ressize = sizeof(struct nfsd_diropres),
713 .pc_cachetype = RC_REPLBUFF,
714 .pc_xdrressize = ST+FH+AT,
715 },
716 [NFSPROC_RMDIR] = {
717 .pc_func = (svc_procfunc) nfsd_proc_rmdir,
718 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
719 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
720 .pc_argsize = sizeof(struct nfsd_diropargs),
721 .pc_ressize = sizeof(struct nfsd_void),
722 .pc_cachetype = RC_REPLSTAT,
723 .pc_xdrressize = ST,
724 },
725 [NFSPROC_READDIR] = {
726 .pc_func = (svc_procfunc) nfsd_proc_readdir,
727 .pc_decode = (kxdrproc_t) nfssvc_decode_readdirargs,
728 .pc_encode = (kxdrproc_t) nfssvc_encode_readdirres,
729 .pc_argsize = sizeof(struct nfsd_readdirargs),
730 .pc_ressize = sizeof(struct nfsd_readdirres),
731 .pc_cachetype = RC_NOCACHE,
732 },
733 [NFSPROC_STATFS] = {
734 .pc_func = (svc_procfunc) nfsd_proc_statfs,
735 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
736 .pc_encode = (kxdrproc_t) nfssvc_encode_statfsres,
737 .pc_argsize = sizeof(struct nfsd_fhandle),
738 .pc_ressize = sizeof(struct nfsd_statfsres),
739 .pc_cachetype = RC_NOCACHE,
740 .pc_xdrressize = ST+5,
741 },
742};
743
744
745struct svc_version nfsd_version2 = {
746 .vs_vers = 2,
747 .vs_nproc = 18,
748 .vs_proc = nfsd_procedures2,
749 .vs_dispatch = nfsd_dispatch,
750 .vs_xdrsize = NFS2_SVC_XDRSIZE,
751};
752
753/*
754 * Map errnos to NFS errnos.
755 */
756__be32
757nfserrno (int errno)
758{
759 static struct {
760 __be32 nfserr;
761 int syserr;
762 } nfs_errtbl[] = {
763 { nfs_ok, 0 },
764 { nfserr_perm, -EPERM },
765 { nfserr_noent, -ENOENT },
766 { nfserr_io, -EIO },
767 { nfserr_nxio, -ENXIO },
768 { nfserr_fbig, -E2BIG },
769 { nfserr_acces, -EACCES },
770 { nfserr_exist, -EEXIST },
771 { nfserr_xdev, -EXDEV },
772 { nfserr_mlink, -EMLINK },
773 { nfserr_nodev, -ENODEV },
774 { nfserr_notdir, -ENOTDIR },
775 { nfserr_isdir, -EISDIR },
776 { nfserr_inval, -EINVAL },
777 { nfserr_fbig, -EFBIG },
778 { nfserr_nospc, -ENOSPC },
779 { nfserr_rofs, -EROFS },
780 { nfserr_mlink, -EMLINK },
781 { nfserr_nametoolong, -ENAMETOOLONG },
782 { nfserr_notempty, -ENOTEMPTY },
783#ifdef EDQUOT
784 { nfserr_dquot, -EDQUOT },
785#endif
786 { nfserr_stale, -ESTALE },
787 { nfserr_jukebox, -ETIMEDOUT },
788 { nfserr_jukebox, -ERESTARTSYS },
789 { nfserr_jukebox, -EAGAIN },
790 { nfserr_jukebox, -EWOULDBLOCK },
791 { nfserr_jukebox, -ENOMEM },
792 { nfserr_io, -ETXTBSY },
793 { nfserr_notsupp, -EOPNOTSUPP },
794 { nfserr_toosmall, -ETOOSMALL },
795 { nfserr_serverfault, -ESERVERFAULT },
796 { nfserr_serverfault, -ENFILE },
797 };
798 int i;
799
800 for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
801 if (nfs_errtbl[i].syserr == errno)
802 return nfs_errtbl[i].nfserr;
803 }
804 WARN(1, "nfsd: non-standard errno: %d\n", errno);
805 return nfserr_io;
806}
807
1// 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 svc_fh *fhp;
55
56 dprintk("nfsd: SETATTR %s, valid=%x, size=%ld\n",
57 SVCFH_fmt(&argp->fh),
58 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
59
60 fhp = fh_copy(&resp->fh, &argp->fh);
61
62 /*
63 * NFSv2 does not differentiate between "set-[ac]time-to-now"
64 * which only requires access, and "set-[ac]time-to-X" which
65 * requires ownership.
66 * So if it looks like it might be "set both to the same time which
67 * is close to now", and if setattr_prepare fails, then we
68 * convert to "set to now" instead of "set to explicit time"
69 *
70 * We only call setattr_prepare as the last test as technically
71 * it is not an interface that we should be using.
72 */
73#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
74#define MAX_TOUCH_TIME_ERROR (30*60)
75 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
76 iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
77 /*
78 * Looks probable.
79 *
80 * Now just make sure time is in the right ballpark.
81 * Solaris, at least, doesn't seem to care what the time
82 * request is. We require it be within 30 minutes of now.
83 */
84 time64_t delta = iap->ia_atime.tv_sec - ktime_get_real_seconds();
85
86 resp->status = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
87 if (resp->status != nfs_ok)
88 goto out;
89
90 if (delta < 0)
91 delta = -delta;
92 if (delta < MAX_TOUCH_TIME_ERROR &&
93 setattr_prepare(&init_user_ns, fhp->fh_dentry, iap) != 0) {
94 /*
95 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
96 * This will cause notify_change to set these times
97 * to "now"
98 */
99 iap->ia_valid &= ~BOTH_TIME_SET;
100 }
101 }
102
103 resp->status = nfsd_setattr(rqstp, fhp, iap, 0, (time64_t)0);
104 if (resp->status != nfs_ok)
105 goto out;
106
107 resp->status = fh_getattr(&resp->fh, &resp->stat);
108out:
109 return rpc_success;
110}
111
112/* Obsolete, replaced by MNTPROC_MNT. */
113static __be32
114nfsd_proc_root(struct svc_rqst *rqstp)
115{
116 return rpc_success;
117}
118
119/*
120 * Look up a path name component
121 * Note: the dentry in the resp->fh may be negative if the file
122 * doesn't exist yet.
123 * N.B. After this call resp->fh needs an fh_put
124 */
125static __be32
126nfsd_proc_lookup(struct svc_rqst *rqstp)
127{
128 struct nfsd_diropargs *argp = rqstp->rq_argp;
129 struct nfsd_diropres *resp = rqstp->rq_resp;
130
131 dprintk("nfsd: LOOKUP %s %.*s\n",
132 SVCFH_fmt(&argp->fh), argp->len, argp->name);
133
134 fh_init(&resp->fh, NFS_FHSIZE);
135 resp->status = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
136 &resp->fh);
137 fh_put(&argp->fh);
138 if (resp->status != nfs_ok)
139 goto out;
140
141 resp->status = fh_getattr(&resp->fh, &resp->stat);
142out:
143 return rpc_success;
144}
145
146/*
147 * Read a symlink.
148 */
149static __be32
150nfsd_proc_readlink(struct svc_rqst *rqstp)
151{
152 struct nfsd_fhandle *argp = rqstp->rq_argp;
153 struct nfsd_readlinkres *resp = rqstp->rq_resp;
154
155 dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
156
157 /* Read the symlink. */
158 resp->len = NFS_MAXPATHLEN;
159 resp->page = *(rqstp->rq_next_page++);
160 resp->status = nfsd_readlink(rqstp, &argp->fh,
161 page_address(resp->page), &resp->len);
162
163 fh_put(&argp->fh);
164 return rpc_success;
165}
166
167/*
168 * Read a portion of a file.
169 * N.B. After this call resp->fh needs an fh_put
170 */
171static __be32
172nfsd_proc_read(struct svc_rqst *rqstp)
173{
174 struct nfsd_readargs *argp = rqstp->rq_argp;
175 struct nfsd_readres *resp = rqstp->rq_resp;
176 unsigned int len;
177 u32 eof;
178 int v;
179
180 dprintk("nfsd: READ %s %d bytes at %d\n",
181 SVCFH_fmt(&argp->fh),
182 argp->count, argp->offset);
183
184 argp->count = min_t(u32, argp->count, NFSSVC_MAXBLKSIZE_V2);
185
186 v = 0;
187 len = argp->count;
188 resp->pages = rqstp->rq_next_page;
189 while (len > 0) {
190 struct page *page = *(rqstp->rq_next_page++);
191
192 rqstp->rq_vec[v].iov_base = page_address(page);
193 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
194 len -= rqstp->rq_vec[v].iov_len;
195 v++;
196 }
197
198 /* Obtain buffer pointer for payload. 19 is 1 word for
199 * status, 17 words for fattr, and 1 word for the byte count.
200 */
201 svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
202
203 resp->count = argp->count;
204 fh_copy(&resp->fh, &argp->fh);
205 resp->status = nfsd_read(rqstp, &resp->fh, argp->offset,
206 rqstp->rq_vec, v, &resp->count, &eof);
207 if (resp->status == nfs_ok)
208 resp->status = fh_getattr(&resp->fh, &resp->stat);
209 else if (resp->status == nfserr_jukebox)
210 return rpc_drop_reply;
211 return rpc_success;
212}
213
214/* Reserved */
215static __be32
216nfsd_proc_writecache(struct svc_rqst *rqstp)
217{
218 return rpc_success;
219}
220
221/*
222 * Write data to a file
223 * N.B. After this call resp->fh needs an fh_put
224 */
225static __be32
226nfsd_proc_write(struct svc_rqst *rqstp)
227{
228 struct nfsd_writeargs *argp = rqstp->rq_argp;
229 struct nfsd_attrstat *resp = rqstp->rq_resp;
230 unsigned long cnt = argp->len;
231 unsigned int nvecs;
232
233 dprintk("nfsd: WRITE %s %d bytes at %d\n",
234 SVCFH_fmt(&argp->fh),
235 argp->len, argp->offset);
236
237 nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
238 &argp->first, cnt);
239 if (!nvecs) {
240 resp->status = nfserr_io;
241 goto out;
242 }
243
244 resp->status = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh),
245 argp->offset, rqstp->rq_vec, nvecs,
246 &cnt, NFS_DATA_SYNC, NULL);
247 if (resp->status == nfs_ok)
248 resp->status = fh_getattr(&resp->fh, &resp->stat);
249 else if (resp->status == nfserr_jukebox)
250 return rpc_drop_reply;
251out:
252 return rpc_success;
253}
254
255/*
256 * CREATE processing is complicated. The keyword here is `overloaded.'
257 * The parent directory is kept locked between the check for existence
258 * and the actual create() call in compliance with VFS protocols.
259 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
260 */
261static __be32
262nfsd_proc_create(struct svc_rqst *rqstp)
263{
264 struct nfsd_createargs *argp = rqstp->rq_argp;
265 struct nfsd_diropres *resp = rqstp->rq_resp;
266 svc_fh *dirfhp = &argp->fh;
267 svc_fh *newfhp = &resp->fh;
268 struct iattr *attr = &argp->attrs;
269 struct inode *inode;
270 struct dentry *dchild;
271 int type, mode;
272 int hosterr;
273 dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size);
274
275 dprintk("nfsd: CREATE %s %.*s\n",
276 SVCFH_fmt(dirfhp), argp->len, argp->name);
277
278 /* First verify the parent file handle */
279 resp->status = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
280 if (resp->status != nfs_ok)
281 goto done; /* must fh_put dirfhp even on error */
282
283 /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
284
285 resp->status = nfserr_exist;
286 if (isdotent(argp->name, argp->len))
287 goto done;
288 hosterr = fh_want_write(dirfhp);
289 if (hosterr) {
290 resp->status = nfserrno(hosterr);
291 goto done;
292 }
293
294 fh_lock_nested(dirfhp, I_MUTEX_PARENT);
295 dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
296 if (IS_ERR(dchild)) {
297 resp->status = nfserrno(PTR_ERR(dchild));
298 goto out_unlock;
299 }
300 fh_init(newfhp, NFS_FHSIZE);
301 resp->status = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
302 if (!resp->status && d_really_is_negative(dchild))
303 resp->status = nfserr_noent;
304 dput(dchild);
305 if (resp->status) {
306 if (resp->status != nfserr_noent)
307 goto out_unlock;
308 /*
309 * If the new file handle wasn't verified, we can't tell
310 * whether the file exists or not. Time to bail ...
311 */
312 resp->status = nfserr_acces;
313 if (!newfhp->fh_dentry) {
314 printk(KERN_WARNING
315 "nfsd_proc_create: file handle not verified\n");
316 goto out_unlock;
317 }
318 }
319
320 inode = d_inode(newfhp->fh_dentry);
321
322 /* Unfudge the mode bits */
323 if (attr->ia_valid & ATTR_MODE) {
324 type = attr->ia_mode & S_IFMT;
325 mode = attr->ia_mode & ~S_IFMT;
326 if (!type) {
327 /* no type, so if target exists, assume same as that,
328 * else assume a file */
329 if (inode) {
330 type = inode->i_mode & S_IFMT;
331 switch(type) {
332 case S_IFCHR:
333 case S_IFBLK:
334 /* reserve rdev for later checking */
335 rdev = inode->i_rdev;
336 attr->ia_valid |= ATTR_SIZE;
337
338 fallthrough;
339 case S_IFIFO:
340 /* this is probably a permission check..
341 * at least IRIX implements perm checking on
342 * echo thing > device-special-file-or-pipe
343 * by doing a CREATE with type==0
344 */
345 resp->status = nfsd_permission(rqstp,
346 newfhp->fh_export,
347 newfhp->fh_dentry,
348 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
349 if (resp->status && resp->status != nfserr_rofs)
350 goto out_unlock;
351 }
352 } else
353 type = S_IFREG;
354 }
355 } else if (inode) {
356 type = inode->i_mode & S_IFMT;
357 mode = inode->i_mode & ~S_IFMT;
358 } else {
359 type = S_IFREG;
360 mode = 0; /* ??? */
361 }
362
363 attr->ia_valid |= ATTR_MODE;
364 attr->ia_mode = mode;
365
366 /* Special treatment for non-regular files according to the
367 * gospel of sun micro
368 */
369 if (type != S_IFREG) {
370 if (type != S_IFBLK && type != S_IFCHR) {
371 rdev = 0;
372 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
373 /* If you think you've seen the worst, grok this. */
374 type = S_IFIFO;
375 } else {
376 /* Okay, char or block special */
377 if (!rdev)
378 rdev = wanted;
379 }
380
381 /* we've used the SIZE information, so discard it */
382 attr->ia_valid &= ~ATTR_SIZE;
383
384 /* Make sure the type and device matches */
385 resp->status = nfserr_exist;
386 if (inode && inode_wrong_type(inode, type))
387 goto out_unlock;
388 }
389
390 resp->status = nfs_ok;
391 if (!inode) {
392 /* File doesn't exist. Create it and set attrs */
393 resp->status = nfsd_create_locked(rqstp, dirfhp, argp->name,
394 argp->len, attr, type, rdev,
395 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, attr, 0,
406 (time64_t)0);
407 }
408
409out_unlock:
410 /* We don't really need to unlock, as fh_put does it. */
411 fh_unlock(dirfhp);
412 fh_drop_write(dirfhp);
413done:
414 fh_put(dirfhp);
415 if (resp->status != nfs_ok)
416 goto out;
417 resp->status = fh_getattr(&resp->fh, &resp->stat);
418out:
419 return rpc_success;
420}
421
422static __be32
423nfsd_proc_remove(struct svc_rqst *rqstp)
424{
425 struct nfsd_diropargs *argp = rqstp->rq_argp;
426 struct nfsd_stat *resp = rqstp->rq_resp;
427
428 dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh),
429 argp->len, argp->name);
430
431 /* Unlink. -SIFDIR means file must not be a directory */
432 resp->status = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR,
433 argp->name, argp->len);
434 fh_put(&argp->fh);
435 return rpc_success;
436}
437
438static __be32
439nfsd_proc_rename(struct svc_rqst *rqstp)
440{
441 struct nfsd_renameargs *argp = rqstp->rq_argp;
442 struct nfsd_stat *resp = rqstp->rq_resp;
443
444 dprintk("nfsd: RENAME %s %.*s -> \n",
445 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
446 dprintk("nfsd: -> %s %.*s\n",
447 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
448
449 resp->status = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
450 &argp->tfh, argp->tname, argp->tlen);
451 fh_put(&argp->ffh);
452 fh_put(&argp->tfh);
453 return rpc_success;
454}
455
456static __be32
457nfsd_proc_link(struct svc_rqst *rqstp)
458{
459 struct nfsd_linkargs *argp = rqstp->rq_argp;
460 struct nfsd_stat *resp = rqstp->rq_resp;
461
462 dprintk("nfsd: LINK %s ->\n",
463 SVCFH_fmt(&argp->ffh));
464 dprintk("nfsd: %s %.*s\n",
465 SVCFH_fmt(&argp->tfh),
466 argp->tlen,
467 argp->tname);
468
469 resp->status = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
470 &argp->ffh);
471 fh_put(&argp->ffh);
472 fh_put(&argp->tfh);
473 return rpc_success;
474}
475
476static __be32
477nfsd_proc_symlink(struct svc_rqst *rqstp)
478{
479 struct nfsd_symlinkargs *argp = rqstp->rq_argp;
480 struct nfsd_stat *resp = rqstp->rq_resp;
481 struct svc_fh newfh;
482
483 if (argp->tlen > NFS_MAXPATHLEN) {
484 resp->status = nfserr_nametoolong;
485 goto out;
486 }
487
488 argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
489 page_address(rqstp->rq_arg.pages[0]),
490 argp->tlen);
491 if (IS_ERR(argp->tname)) {
492 resp->status = nfserrno(PTR_ERR(argp->tname));
493 goto out;
494 }
495
496 dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n",
497 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
498 argp->tlen, argp->tname);
499
500 fh_init(&newfh, NFS_FHSIZE);
501 resp->status = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
502 argp->tname, &newfh);
503
504 kfree(argp->tname);
505 fh_put(&argp->ffh);
506 fh_put(&newfh);
507out:
508 return rpc_success;
509}
510
511/*
512 * Make directory. This operation is not idempotent.
513 * N.B. After this call resp->fh needs an fh_put
514 */
515static __be32
516nfsd_proc_mkdir(struct svc_rqst *rqstp)
517{
518 struct nfsd_createargs *argp = rqstp->rq_argp;
519 struct nfsd_diropres *resp = rqstp->rq_resp;
520
521 dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
522
523 if (resp->fh.fh_dentry) {
524 printk(KERN_WARNING
525 "nfsd_proc_mkdir: response already verified??\n");
526 }
527
528 argp->attrs.ia_valid &= ~ATTR_SIZE;
529 fh_init(&resp->fh, NFS_FHSIZE);
530 resp->status = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
531 &argp->attrs, S_IFDIR, 0, &resp->fh);
532 fh_put(&argp->fh);
533 if (resp->status != nfs_ok)
534 goto out;
535
536 resp->status = fh_getattr(&resp->fh, &resp->stat);
537out:
538 return rpc_success;
539}
540
541/*
542 * Remove a directory
543 */
544static __be32
545nfsd_proc_rmdir(struct svc_rqst *rqstp)
546{
547 struct nfsd_diropargs *argp = rqstp->rq_argp;
548 struct nfsd_stat *resp = rqstp->rq_resp;
549
550 dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
551
552 resp->status = nfsd_unlink(rqstp, &argp->fh, S_IFDIR,
553 argp->name, argp->len);
554 fh_put(&argp->fh);
555 return rpc_success;
556}
557
558static void nfsd_init_dirlist_pages(struct svc_rqst *rqstp,
559 struct nfsd_readdirres *resp,
560 int count)
561{
562 struct xdr_buf *buf = &resp->dirlist;
563 struct xdr_stream *xdr = &resp->xdr;
564
565 count = min_t(u32, count, PAGE_SIZE);
566
567 memset(buf, 0, sizeof(*buf));
568
569 /* Reserve room for the NULL ptr & eof flag (-2 words) */
570 buf->buflen = count - sizeof(__be32) * 2;
571 buf->pages = rqstp->rq_next_page;
572 rqstp->rq_next_page++;
573
574 /* This is xdr_init_encode(), but it assumes that
575 * the head kvec has already been consumed. */
576 xdr_set_scratch_buffer(xdr, NULL, 0);
577 xdr->buf = buf;
578 xdr->page_ptr = buf->pages;
579 xdr->iov = NULL;
580 xdr->p = page_address(*buf->pages);
581 xdr->end = xdr->p + (PAGE_SIZE >> 2);
582 xdr->rqst = NULL;
583}
584
585/*
586 * Read a portion of a directory.
587 */
588static __be32
589nfsd_proc_readdir(struct svc_rqst *rqstp)
590{
591 struct nfsd_readdirargs *argp = rqstp->rq_argp;
592 struct nfsd_readdirres *resp = rqstp->rq_resp;
593 loff_t offset;
594
595 dprintk("nfsd: READDIR %s %d bytes at %d\n",
596 SVCFH_fmt(&argp->fh),
597 argp->count, argp->cookie);
598
599 nfsd_init_dirlist_pages(rqstp, resp, argp->count);
600
601 resp->common.err = nfs_ok;
602 resp->cookie_offset = 0;
603 offset = argp->cookie;
604 resp->status = nfsd_readdir(rqstp, &argp->fh, &offset,
605 &resp->common, nfssvc_encode_entry);
606 nfssvc_encode_nfscookie(resp, offset);
607
608 fh_put(&argp->fh);
609 return rpc_success;
610}
611
612/*
613 * Get file system info
614 */
615static __be32
616nfsd_proc_statfs(struct svc_rqst *rqstp)
617{
618 struct nfsd_fhandle *argp = rqstp->rq_argp;
619 struct nfsd_statfsres *resp = rqstp->rq_resp;
620
621 dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh));
622
623 resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
624 NFSD_MAY_BYPASS_GSS_ON_ROOT);
625 fh_put(&argp->fh);
626 return rpc_success;
627}
628
629/*
630 * NFSv2 Server procedures.
631 * Only the results of non-idempotent operations are cached.
632 */
633
634#define ST 1 /* status */
635#define FH 8 /* filehandle */
636#define AT 18 /* attributes */
637
638static const struct svc_procedure nfsd_procedures2[18] = {
639 [NFSPROC_NULL] = {
640 .pc_func = nfsd_proc_null,
641 .pc_decode = nfssvc_decode_voidarg,
642 .pc_encode = nfssvc_encode_voidres,
643 .pc_argsize = sizeof(struct nfsd_voidargs),
644 .pc_ressize = sizeof(struct nfsd_voidres),
645 .pc_cachetype = RC_NOCACHE,
646 .pc_xdrressize = 0,
647 .pc_name = "NULL",
648 },
649 [NFSPROC_GETATTR] = {
650 .pc_func = nfsd_proc_getattr,
651 .pc_decode = nfssvc_decode_fhandleargs,
652 .pc_encode = nfssvc_encode_attrstatres,
653 .pc_release = nfssvc_release_attrstat,
654 .pc_argsize = sizeof(struct nfsd_fhandle),
655 .pc_ressize = sizeof(struct nfsd_attrstat),
656 .pc_cachetype = RC_NOCACHE,
657 .pc_xdrressize = ST+AT,
658 .pc_name = "GETATTR",
659 },
660 [NFSPROC_SETATTR] = {
661 .pc_func = nfsd_proc_setattr,
662 .pc_decode = nfssvc_decode_sattrargs,
663 .pc_encode = nfssvc_encode_attrstatres,
664 .pc_release = nfssvc_release_attrstat,
665 .pc_argsize = sizeof(struct nfsd_sattrargs),
666 .pc_ressize = sizeof(struct nfsd_attrstat),
667 .pc_cachetype = RC_REPLBUFF,
668 .pc_xdrressize = ST+AT,
669 .pc_name = "SETATTR",
670 },
671 [NFSPROC_ROOT] = {
672 .pc_func = nfsd_proc_root,
673 .pc_decode = nfssvc_decode_voidarg,
674 .pc_encode = nfssvc_encode_voidres,
675 .pc_argsize = 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_ressize = sizeof(struct nfsd_diropres),
688 .pc_cachetype = RC_NOCACHE,
689 .pc_xdrressize = ST+FH+AT,
690 .pc_name = "LOOKUP",
691 },
692 [NFSPROC_READLINK] = {
693 .pc_func = nfsd_proc_readlink,
694 .pc_decode = nfssvc_decode_fhandleargs,
695 .pc_encode = nfssvc_encode_readlinkres,
696 .pc_argsize = sizeof(struct nfsd_fhandle),
697 .pc_ressize = sizeof(struct nfsd_readlinkres),
698 .pc_cachetype = RC_NOCACHE,
699 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
700 .pc_name = "READLINK",
701 },
702 [NFSPROC_READ] = {
703 .pc_func = nfsd_proc_read,
704 .pc_decode = nfssvc_decode_readargs,
705 .pc_encode = nfssvc_encode_readres,
706 .pc_release = nfssvc_release_readres,
707 .pc_argsize = sizeof(struct nfsd_readargs),
708 .pc_ressize = sizeof(struct nfsd_readres),
709 .pc_cachetype = RC_NOCACHE,
710 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
711 .pc_name = "READ",
712 },
713 [NFSPROC_WRITECACHE] = {
714 .pc_func = nfsd_proc_writecache,
715 .pc_decode = nfssvc_decode_voidarg,
716 .pc_encode = nfssvc_encode_voidres,
717 .pc_argsize = sizeof(struct nfsd_voidargs),
718 .pc_ressize = sizeof(struct nfsd_voidres),
719 .pc_cachetype = RC_NOCACHE,
720 .pc_xdrressize = 0,
721 .pc_name = "WRITECACHE",
722 },
723 [NFSPROC_WRITE] = {
724 .pc_func = nfsd_proc_write,
725 .pc_decode = nfssvc_decode_writeargs,
726 .pc_encode = nfssvc_encode_attrstatres,
727 .pc_release = nfssvc_release_attrstat,
728 .pc_argsize = sizeof(struct nfsd_writeargs),
729 .pc_ressize = sizeof(struct nfsd_attrstat),
730 .pc_cachetype = RC_REPLBUFF,
731 .pc_xdrressize = ST+AT,
732 .pc_name = "WRITE",
733 },
734 [NFSPROC_CREATE] = {
735 .pc_func = nfsd_proc_create,
736 .pc_decode = nfssvc_decode_createargs,
737 .pc_encode = nfssvc_encode_diropres,
738 .pc_release = nfssvc_release_diropres,
739 .pc_argsize = sizeof(struct nfsd_createargs),
740 .pc_ressize = sizeof(struct nfsd_diropres),
741 .pc_cachetype = RC_REPLBUFF,
742 .pc_xdrressize = ST+FH+AT,
743 .pc_name = "CREATE",
744 },
745 [NFSPROC_REMOVE] = {
746 .pc_func = nfsd_proc_remove,
747 .pc_decode = nfssvc_decode_diropargs,
748 .pc_encode = nfssvc_encode_statres,
749 .pc_argsize = sizeof(struct nfsd_diropargs),
750 .pc_ressize = sizeof(struct nfsd_stat),
751 .pc_cachetype = RC_REPLSTAT,
752 .pc_xdrressize = ST,
753 .pc_name = "REMOVE",
754 },
755 [NFSPROC_RENAME] = {
756 .pc_func = nfsd_proc_rename,
757 .pc_decode = nfssvc_decode_renameargs,
758 .pc_encode = nfssvc_encode_statres,
759 .pc_argsize = sizeof(struct nfsd_renameargs),
760 .pc_ressize = sizeof(struct nfsd_stat),
761 .pc_cachetype = RC_REPLSTAT,
762 .pc_xdrressize = ST,
763 .pc_name = "RENAME",
764 },
765 [NFSPROC_LINK] = {
766 .pc_func = nfsd_proc_link,
767 .pc_decode = nfssvc_decode_linkargs,
768 .pc_encode = nfssvc_encode_statres,
769 .pc_argsize = sizeof(struct nfsd_linkargs),
770 .pc_ressize = sizeof(struct nfsd_stat),
771 .pc_cachetype = RC_REPLSTAT,
772 .pc_xdrressize = ST,
773 .pc_name = "LINK",
774 },
775 [NFSPROC_SYMLINK] = {
776 .pc_func = nfsd_proc_symlink,
777 .pc_decode = nfssvc_decode_symlinkargs,
778 .pc_encode = nfssvc_encode_statres,
779 .pc_argsize = sizeof(struct nfsd_symlinkargs),
780 .pc_ressize = sizeof(struct nfsd_stat),
781 .pc_cachetype = RC_REPLSTAT,
782 .pc_xdrressize = ST,
783 .pc_name = "SYMLINK",
784 },
785 [NFSPROC_MKDIR] = {
786 .pc_func = nfsd_proc_mkdir,
787 .pc_decode = nfssvc_decode_createargs,
788 .pc_encode = nfssvc_encode_diropres,
789 .pc_release = nfssvc_release_diropres,
790 .pc_argsize = sizeof(struct nfsd_createargs),
791 .pc_ressize = sizeof(struct nfsd_diropres),
792 .pc_cachetype = RC_REPLBUFF,
793 .pc_xdrressize = ST+FH+AT,
794 .pc_name = "MKDIR",
795 },
796 [NFSPROC_RMDIR] = {
797 .pc_func = nfsd_proc_rmdir,
798 .pc_decode = nfssvc_decode_diropargs,
799 .pc_encode = nfssvc_encode_statres,
800 .pc_argsize = 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_ressize = sizeof(struct nfsd_readdirres),
812 .pc_cachetype = RC_NOCACHE,
813 .pc_name = "READDIR",
814 },
815 [NFSPROC_STATFS] = {
816 .pc_func = nfsd_proc_statfs,
817 .pc_decode = nfssvc_decode_fhandleargs,
818 .pc_encode = nfssvc_encode_statfsres,
819 .pc_argsize = sizeof(struct nfsd_fhandle),
820 .pc_ressize = sizeof(struct nfsd_statfsres),
821 .pc_cachetype = RC_NOCACHE,
822 .pc_xdrressize = ST+5,
823 .pc_name = "STATFS",
824 },
825};
826
827
828static unsigned int nfsd_count2[ARRAY_SIZE(nfsd_procedures2)];
829const struct svc_version nfsd_version2 = {
830 .vs_vers = 2,
831 .vs_nproc = 18,
832 .vs_proc = nfsd_procedures2,
833 .vs_count = nfsd_count2,
834 .vs_dispatch = nfsd_dispatch,
835 .vs_xdrsize = NFS2_SVC_XDRSIZE,
836};
837
838/*
839 * Map errnos to NFS errnos.
840 */
841__be32
842nfserrno (int errno)
843{
844 static struct {
845 __be32 nfserr;
846 int syserr;
847 } nfs_errtbl[] = {
848 { nfs_ok, 0 },
849 { nfserr_perm, -EPERM },
850 { nfserr_noent, -ENOENT },
851 { nfserr_io, -EIO },
852 { nfserr_nxio, -ENXIO },
853 { nfserr_fbig, -E2BIG },
854 { nfserr_acces, -EACCES },
855 { nfserr_exist, -EEXIST },
856 { nfserr_xdev, -EXDEV },
857 { nfserr_mlink, -EMLINK },
858 { nfserr_nodev, -ENODEV },
859 { nfserr_notdir, -ENOTDIR },
860 { nfserr_isdir, -EISDIR },
861 { nfserr_inval, -EINVAL },
862 { nfserr_fbig, -EFBIG },
863 { nfserr_nospc, -ENOSPC },
864 { nfserr_rofs, -EROFS },
865 { nfserr_mlink, -EMLINK },
866 { nfserr_nametoolong, -ENAMETOOLONG },
867 { nfserr_notempty, -ENOTEMPTY },
868#ifdef EDQUOT
869 { nfserr_dquot, -EDQUOT },
870#endif
871 { nfserr_stale, -ESTALE },
872 { nfserr_jukebox, -ETIMEDOUT },
873 { nfserr_jukebox, -ERESTARTSYS },
874 { nfserr_jukebox, -EAGAIN },
875 { nfserr_jukebox, -EWOULDBLOCK },
876 { nfserr_jukebox, -ENOMEM },
877 { nfserr_io, -ETXTBSY },
878 { nfserr_notsupp, -EOPNOTSUPP },
879 { nfserr_toosmall, -ETOOSMALL },
880 { nfserr_serverfault, -ESERVERFAULT },
881 { nfserr_serverfault, -ENFILE },
882 { nfserr_io, -EUCLEAN },
883 { nfserr_perm, -ENOKEY },
884 };
885 int i;
886
887 for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
888 if (nfs_errtbl[i].syserr == errno)
889 return nfs_errtbl[i].nfserr;
890 }
891 WARN_ONCE(1, "nfsd: non-standard errno: %d\n", errno);
892 return nfserr_io;
893}
894