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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 setattr_prepare fails, then we
78 * convert to "set to now" instead of "set to explicit time"
79 *
80 * We only call setattr_prepare as the last test as technically
81 * it is not an interface that we should be using.
82 */
83#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
84#define MAX_TOUCH_TIME_ERROR (30*60)
85 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
86 iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
87 /*
88 * Looks probable.
89 *
90 * Now just make sure time is in the right ballpark.
91 * Solaris, at least, doesn't seem to care what the time
92 * request is. We require it be within 30 minutes of now.
93 */
94 time_t delta = iap->ia_atime.tv_sec - get_seconds();
95
96 nfserr = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
97 if (nfserr)
98 goto done;
99
100 if (delta < 0)
101 delta = -delta;
102 if (delta < MAX_TOUCH_TIME_ERROR &&
103 setattr_prepare(fhp->fh_dentry, iap) != 0) {
104 /*
105 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
106 * This will cause notify_change to set these times
107 * to "now"
108 */
109 iap->ia_valid &= ~BOTH_TIME_SET;
110 }
111 }
112
113 nfserr = nfsd_setattr(rqstp, fhp, iap, 0, (time_t)0);
114done:
115 return nfsd_return_attrs(nfserr, resp);
116}
117
118/*
119 * Look up a path name component
120 * Note: the dentry in the resp->fh may be negative if the file
121 * doesn't exist yet.
122 * N.B. After this call resp->fh needs an fh_put
123 */
124static __be32
125nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
126 struct nfsd_diropres *resp)
127{
128 __be32 nfserr;
129
130 dprintk("nfsd: LOOKUP %s %.*s\n",
131 SVCFH_fmt(&argp->fh), argp->len, argp->name);
132
133 fh_init(&resp->fh, NFS_FHSIZE);
134 nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
135 &resp->fh);
136
137 fh_put(&argp->fh);
138 return nfsd_return_dirop(nfserr, resp);
139}
140
141/*
142 * Read a symlink.
143 */
144static __be32
145nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
146 struct nfsd_readlinkres *resp)
147{
148 __be32 nfserr;
149
150 dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
151
152 /* Read the symlink. */
153 resp->len = NFS_MAXPATHLEN;
154 nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
155
156 fh_put(&argp->fh);
157 return nfserr;
158}
159
160/*
161 * Read a portion of a file.
162 * N.B. After this call resp->fh needs an fh_put
163 */
164static __be32
165nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
166 struct nfsd_readres *resp)
167{
168 __be32 nfserr;
169
170 dprintk("nfsd: READ %s %d bytes at %d\n",
171 SVCFH_fmt(&argp->fh),
172 argp->count, argp->offset);
173
174 /* Obtain buffer pointer for payload. 19 is 1 word for
175 * status, 17 words for fattr, and 1 word for the byte count.
176 */
177
178 if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
179 char buf[RPC_MAX_ADDRBUFLEN];
180 printk(KERN_NOTICE
181 "oversized read request from %s (%d bytes)\n",
182 svc_print_addr(rqstp, buf, sizeof(buf)),
183 argp->count);
184 argp->count = NFSSVC_MAXBLKSIZE_V2;
185 }
186 svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
187
188 resp->count = argp->count;
189 nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
190 argp->offset,
191 rqstp->rq_vec, argp->vlen,
192 &resp->count);
193
194 if (nfserr) return nfserr;
195 return fh_getattr(&resp->fh, &resp->stat);
196}
197
198/*
199 * Write data to a file
200 * N.B. After this call resp->fh needs an fh_put
201 */
202static __be32
203nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
204 struct nfsd_attrstat *resp)
205{
206 __be32 nfserr;
207 int stable = 1;
208 unsigned long cnt = argp->len;
209
210 dprintk("nfsd: WRITE %s %d bytes at %d\n",
211 SVCFH_fmt(&argp->fh),
212 argp->len, argp->offset);
213
214 nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
215 argp->offset,
216 rqstp->rq_vec, argp->vlen,
217 &cnt,
218 &stable);
219 return nfsd_return_attrs(nfserr, resp);
220}
221
222/*
223 * CREATE processing is complicated. The keyword here is `overloaded.'
224 * The parent directory is kept locked between the check for existence
225 * and the actual create() call in compliance with VFS protocols.
226 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
227 */
228static __be32
229nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
230 struct nfsd_diropres *resp)
231{
232 svc_fh *dirfhp = &argp->fh;
233 svc_fh *newfhp = &resp->fh;
234 struct iattr *attr = &argp->attrs;
235 struct inode *inode;
236 struct dentry *dchild;
237 int type, mode;
238 __be32 nfserr;
239 int hosterr;
240 dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size);
241
242 dprintk("nfsd: CREATE %s %.*s\n",
243 SVCFH_fmt(dirfhp), argp->len, argp->name);
244
245 /* First verify the parent file handle */
246 nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
247 if (nfserr)
248 goto done; /* must fh_put dirfhp even on error */
249
250 /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
251
252 nfserr = nfserr_exist;
253 if (isdotent(argp->name, argp->len))
254 goto done;
255 hosterr = fh_want_write(dirfhp);
256 if (hosterr) {
257 nfserr = nfserrno(hosterr);
258 goto done;
259 }
260
261 fh_lock_nested(dirfhp, I_MUTEX_PARENT);
262 dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
263 if (IS_ERR(dchild)) {
264 nfserr = nfserrno(PTR_ERR(dchild));
265 goto out_unlock;
266 }
267 fh_init(newfhp, NFS_FHSIZE);
268 nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
269 if (!nfserr && d_really_is_negative(dchild))
270 nfserr = nfserr_noent;
271 dput(dchild);
272 if (nfserr) {
273 if (nfserr != nfserr_noent)
274 goto out_unlock;
275 /*
276 * If the new file handle wasn't verified, we can't tell
277 * whether the file exists or not. Time to bail ...
278 */
279 nfserr = nfserr_acces;
280 if (!newfhp->fh_dentry) {
281 printk(KERN_WARNING
282 "nfsd_proc_create: file handle not verified\n");
283 goto out_unlock;
284 }
285 }
286
287 inode = d_inode(newfhp->fh_dentry);
288
289 /* Unfudge the mode bits */
290 if (attr->ia_valid & ATTR_MODE) {
291 type = attr->ia_mode & S_IFMT;
292 mode = attr->ia_mode & ~S_IFMT;
293 if (!type) {
294 /* no type, so if target exists, assume same as that,
295 * else assume a file */
296 if (inode) {
297 type = inode->i_mode & S_IFMT;
298 switch(type) {
299 case S_IFCHR:
300 case S_IFBLK:
301 /* reserve rdev for later checking */
302 rdev = inode->i_rdev;
303 attr->ia_valid |= ATTR_SIZE;
304
305 /* FALLTHROUGH */
306 case S_IFIFO:
307 /* this is probably a permission check..
308 * at least IRIX implements perm checking on
309 * echo thing > device-special-file-or-pipe
310 * by doing a CREATE with type==0
311 */
312 nfserr = nfsd_permission(rqstp,
313 newfhp->fh_export,
314 newfhp->fh_dentry,
315 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
316 if (nfserr && nfserr != nfserr_rofs)
317 goto out_unlock;
318 }
319 } else
320 type = S_IFREG;
321 }
322 } else if (inode) {
323 type = inode->i_mode & S_IFMT;
324 mode = inode->i_mode & ~S_IFMT;
325 } else {
326 type = S_IFREG;
327 mode = 0; /* ??? */
328 }
329
330 attr->ia_valid |= ATTR_MODE;
331 attr->ia_mode = mode;
332
333 /* Special treatment for non-regular files according to the
334 * gospel of sun micro
335 */
336 if (type != S_IFREG) {
337 if (type != S_IFBLK && type != S_IFCHR) {
338 rdev = 0;
339 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
340 /* If you think you've seen the worst, grok this. */
341 type = S_IFIFO;
342 } else {
343 /* Okay, char or block special */
344 if (!rdev)
345 rdev = wanted;
346 }
347
348 /* we've used the SIZE information, so discard it */
349 attr->ia_valid &= ~ATTR_SIZE;
350
351 /* Make sure the type and device matches */
352 nfserr = nfserr_exist;
353 if (inode && type != (inode->i_mode & S_IFMT))
354 goto out_unlock;
355 }
356
357 nfserr = 0;
358 if (!inode) {
359 /* File doesn't exist. Create it and set attrs */
360 nfserr = nfsd_create_locked(rqstp, dirfhp, argp->name,
361 argp->len, attr, type, rdev, newfhp);
362 } else if (type == S_IFREG) {
363 dprintk("nfsd: existing %s, valid=%x, size=%ld\n",
364 argp->name, attr->ia_valid, (long) attr->ia_size);
365 /* File already exists. We ignore all attributes except
366 * size, so that creat() behaves exactly like
367 * open(..., O_CREAT|O_TRUNC|O_WRONLY).
368 */
369 attr->ia_valid &= ATTR_SIZE;
370 if (attr->ia_valid)
371 nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
372 }
373
374out_unlock:
375 /* We don't really need to unlock, as fh_put does it. */
376 fh_unlock(dirfhp);
377 fh_drop_write(dirfhp);
378done:
379 fh_put(dirfhp);
380 return nfsd_return_dirop(nfserr, resp);
381}
382
383static __be32
384nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
385 void *resp)
386{
387 __be32 nfserr;
388
389 dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh),
390 argp->len, argp->name);
391
392 /* Unlink. -SIFDIR means file must not be a directory */
393 nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
394 fh_put(&argp->fh);
395 return nfserr;
396}
397
398static __be32
399nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
400 void *resp)
401{
402 __be32 nfserr;
403
404 dprintk("nfsd: RENAME %s %.*s -> \n",
405 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
406 dprintk("nfsd: -> %s %.*s\n",
407 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
408
409 nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
410 &argp->tfh, argp->tname, argp->tlen);
411 fh_put(&argp->ffh);
412 fh_put(&argp->tfh);
413 return nfserr;
414}
415
416static __be32
417nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
418 void *resp)
419{
420 __be32 nfserr;
421
422 dprintk("nfsd: LINK %s ->\n",
423 SVCFH_fmt(&argp->ffh));
424 dprintk("nfsd: %s %.*s\n",
425 SVCFH_fmt(&argp->tfh),
426 argp->tlen,
427 argp->tname);
428
429 nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
430 &argp->ffh);
431 fh_put(&argp->ffh);
432 fh_put(&argp->tfh);
433 return nfserr;
434}
435
436static __be32
437nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
438 void *resp)
439{
440 struct svc_fh newfh;
441 __be32 nfserr;
442
443 dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n",
444 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
445 argp->tlen, argp->tname);
446
447 fh_init(&newfh, NFS_FHSIZE);
448 /*
449 * Crazy hack: the request fits in a page, and already-decoded
450 * attributes follow argp->tname, so it's safe to just write a
451 * null to ensure it's null-terminated:
452 */
453 argp->tname[argp->tlen] = '\0';
454 nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
455 argp->tname, &newfh);
456
457 fh_put(&argp->ffh);
458 fh_put(&newfh);
459 return nfserr;
460}
461
462/*
463 * Make directory. This operation is not idempotent.
464 * N.B. After this call resp->fh needs an fh_put
465 */
466static __be32
467nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
468 struct nfsd_diropres *resp)
469{
470 __be32 nfserr;
471
472 dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
473
474 if (resp->fh.fh_dentry) {
475 printk(KERN_WARNING
476 "nfsd_proc_mkdir: response already verified??\n");
477 }
478
479 argp->attrs.ia_valid &= ~ATTR_SIZE;
480 fh_init(&resp->fh, NFS_FHSIZE);
481 nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
482 &argp->attrs, S_IFDIR, 0, &resp->fh);
483 fh_put(&argp->fh);
484 return nfsd_return_dirop(nfserr, resp);
485}
486
487/*
488 * Remove a directory
489 */
490static __be32
491nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
492 void *resp)
493{
494 __be32 nfserr;
495
496 dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
497
498 nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
499 fh_put(&argp->fh);
500 return nfserr;
501}
502
503/*
504 * Read a portion of a directory.
505 */
506static __be32
507nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
508 struct nfsd_readdirres *resp)
509{
510 int count;
511 __be32 nfserr;
512 loff_t offset;
513
514 dprintk("nfsd: READDIR %s %d bytes at %d\n",
515 SVCFH_fmt(&argp->fh),
516 argp->count, argp->cookie);
517
518 /* Shrink to the client read size */
519 count = (argp->count >> 2) - 2;
520
521 /* Make sure we've room for the NULL ptr & eof flag */
522 count -= 2;
523 if (count < 0)
524 count = 0;
525
526 resp->buffer = argp->buffer;
527 resp->offset = NULL;
528 resp->buflen = count;
529 resp->common.err = nfs_ok;
530 /* Read directory and encode entries on the fly */
531 offset = argp->cookie;
532 nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
533 &resp->common, nfssvc_encode_entry);
534
535 resp->count = resp->buffer - argp->buffer;
536 if (resp->offset)
537 *resp->offset = htonl(offset);
538
539 fh_put(&argp->fh);
540 return nfserr;
541}
542
543/*
544 * Get file system info
545 */
546static __be32
547nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle *argp,
548 struct nfsd_statfsres *resp)
549{
550 __be32 nfserr;
551
552 dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh));
553
554 nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
555 NFSD_MAY_BYPASS_GSS_ON_ROOT);
556 fh_put(&argp->fh);
557 return nfserr;
558}
559
560/*
561 * NFSv2 Server procedures.
562 * Only the results of non-idempotent operations are cached.
563 */
564struct nfsd_void { int dummy; };
565
566#define ST 1 /* status */
567#define FH 8 /* filehandle */
568#define AT 18 /* attributes */
569
570static struct svc_procedure nfsd_procedures2[18] = {
571 [NFSPROC_NULL] = {
572 .pc_func = (svc_procfunc) nfsd_proc_null,
573 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
574 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
575 .pc_argsize = sizeof(struct nfsd_void),
576 .pc_ressize = sizeof(struct nfsd_void),
577 .pc_cachetype = RC_NOCACHE,
578 .pc_xdrressize = ST,
579 },
580 [NFSPROC_GETATTR] = {
581 .pc_func = (svc_procfunc) nfsd_proc_getattr,
582 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
583 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
584 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
585 .pc_argsize = sizeof(struct nfsd_fhandle),
586 .pc_ressize = sizeof(struct nfsd_attrstat),
587 .pc_cachetype = RC_NOCACHE,
588 .pc_xdrressize = ST+AT,
589 },
590 [NFSPROC_SETATTR] = {
591 .pc_func = (svc_procfunc) nfsd_proc_setattr,
592 .pc_decode = (kxdrproc_t) nfssvc_decode_sattrargs,
593 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
594 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
595 .pc_argsize = sizeof(struct nfsd_sattrargs),
596 .pc_ressize = sizeof(struct nfsd_attrstat),
597 .pc_cachetype = RC_REPLBUFF,
598 .pc_xdrressize = ST+AT,
599 },
600 [NFSPROC_ROOT] = {
601 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
602 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
603 .pc_argsize = sizeof(struct nfsd_void),
604 .pc_ressize = sizeof(struct nfsd_void),
605 .pc_cachetype = RC_NOCACHE,
606 .pc_xdrressize = ST,
607 },
608 [NFSPROC_LOOKUP] = {
609 .pc_func = (svc_procfunc) nfsd_proc_lookup,
610 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
611 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
612 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
613 .pc_argsize = sizeof(struct nfsd_diropargs),
614 .pc_ressize = sizeof(struct nfsd_diropres),
615 .pc_cachetype = RC_NOCACHE,
616 .pc_xdrressize = ST+FH+AT,
617 },
618 [NFSPROC_READLINK] = {
619 .pc_func = (svc_procfunc) nfsd_proc_readlink,
620 .pc_decode = (kxdrproc_t) nfssvc_decode_readlinkargs,
621 .pc_encode = (kxdrproc_t) nfssvc_encode_readlinkres,
622 .pc_argsize = sizeof(struct nfsd_readlinkargs),
623 .pc_ressize = sizeof(struct nfsd_readlinkres),
624 .pc_cachetype = RC_NOCACHE,
625 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
626 },
627 [NFSPROC_READ] = {
628 .pc_func = (svc_procfunc) nfsd_proc_read,
629 .pc_decode = (kxdrproc_t) nfssvc_decode_readargs,
630 .pc_encode = (kxdrproc_t) nfssvc_encode_readres,
631 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
632 .pc_argsize = sizeof(struct nfsd_readargs),
633 .pc_ressize = sizeof(struct nfsd_readres),
634 .pc_cachetype = RC_NOCACHE,
635 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
636 },
637 [NFSPROC_WRITECACHE] = {
638 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
639 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
640 .pc_argsize = sizeof(struct nfsd_void),
641 .pc_ressize = sizeof(struct nfsd_void),
642 .pc_cachetype = RC_NOCACHE,
643 .pc_xdrressize = ST,
644 },
645 [NFSPROC_WRITE] = {
646 .pc_func = (svc_procfunc) nfsd_proc_write,
647 .pc_decode = (kxdrproc_t) nfssvc_decode_writeargs,
648 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
649 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
650 .pc_argsize = sizeof(struct nfsd_writeargs),
651 .pc_ressize = sizeof(struct nfsd_attrstat),
652 .pc_cachetype = RC_REPLBUFF,
653 .pc_xdrressize = ST+AT,
654 },
655 [NFSPROC_CREATE] = {
656 .pc_func = (svc_procfunc) nfsd_proc_create,
657 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
658 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
659 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
660 .pc_argsize = sizeof(struct nfsd_createargs),
661 .pc_ressize = sizeof(struct nfsd_diropres),
662 .pc_cachetype = RC_REPLBUFF,
663 .pc_xdrressize = ST+FH+AT,
664 },
665 [NFSPROC_REMOVE] = {
666 .pc_func = (svc_procfunc) nfsd_proc_remove,
667 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
668 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
669 .pc_argsize = sizeof(struct nfsd_diropargs),
670 .pc_ressize = sizeof(struct nfsd_void),
671 .pc_cachetype = RC_REPLSTAT,
672 .pc_xdrressize = ST,
673 },
674 [NFSPROC_RENAME] = {
675 .pc_func = (svc_procfunc) nfsd_proc_rename,
676 .pc_decode = (kxdrproc_t) nfssvc_decode_renameargs,
677 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
678 .pc_argsize = sizeof(struct nfsd_renameargs),
679 .pc_ressize = sizeof(struct nfsd_void),
680 .pc_cachetype = RC_REPLSTAT,
681 .pc_xdrressize = ST,
682 },
683 [NFSPROC_LINK] = {
684 .pc_func = (svc_procfunc) nfsd_proc_link,
685 .pc_decode = (kxdrproc_t) nfssvc_decode_linkargs,
686 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
687 .pc_argsize = sizeof(struct nfsd_linkargs),
688 .pc_ressize = sizeof(struct nfsd_void),
689 .pc_cachetype = RC_REPLSTAT,
690 .pc_xdrressize = ST,
691 },
692 [NFSPROC_SYMLINK] = {
693 .pc_func = (svc_procfunc) nfsd_proc_symlink,
694 .pc_decode = (kxdrproc_t) nfssvc_decode_symlinkargs,
695 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
696 .pc_argsize = sizeof(struct nfsd_symlinkargs),
697 .pc_ressize = sizeof(struct nfsd_void),
698 .pc_cachetype = RC_REPLSTAT,
699 .pc_xdrressize = ST,
700 },
701 [NFSPROC_MKDIR] = {
702 .pc_func = (svc_procfunc) nfsd_proc_mkdir,
703 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
704 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
705 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
706 .pc_argsize = sizeof(struct nfsd_createargs),
707 .pc_ressize = sizeof(struct nfsd_diropres),
708 .pc_cachetype = RC_REPLBUFF,
709 .pc_xdrressize = ST+FH+AT,
710 },
711 [NFSPROC_RMDIR] = {
712 .pc_func = (svc_procfunc) nfsd_proc_rmdir,
713 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
714 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
715 .pc_argsize = sizeof(struct nfsd_diropargs),
716 .pc_ressize = sizeof(struct nfsd_void),
717 .pc_cachetype = RC_REPLSTAT,
718 .pc_xdrressize = ST,
719 },
720 [NFSPROC_READDIR] = {
721 .pc_func = (svc_procfunc) nfsd_proc_readdir,
722 .pc_decode = (kxdrproc_t) nfssvc_decode_readdirargs,
723 .pc_encode = (kxdrproc_t) nfssvc_encode_readdirres,
724 .pc_argsize = sizeof(struct nfsd_readdirargs),
725 .pc_ressize = sizeof(struct nfsd_readdirres),
726 .pc_cachetype = RC_NOCACHE,
727 },
728 [NFSPROC_STATFS] = {
729 .pc_func = (svc_procfunc) nfsd_proc_statfs,
730 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
731 .pc_encode = (kxdrproc_t) nfssvc_encode_statfsres,
732 .pc_argsize = sizeof(struct nfsd_fhandle),
733 .pc_ressize = sizeof(struct nfsd_statfsres),
734 .pc_cachetype = RC_NOCACHE,
735 .pc_xdrressize = ST+5,
736 },
737};
738
739
740struct svc_version nfsd_version2 = {
741 .vs_vers = 2,
742 .vs_nproc = 18,
743 .vs_proc = nfsd_procedures2,
744 .vs_dispatch = nfsd_dispatch,
745 .vs_xdrsize = NFS2_SVC_XDRSIZE,
746};
747
748/*
749 * Map errnos to NFS errnos.
750 */
751__be32
752nfserrno (int errno)
753{
754 static struct {
755 __be32 nfserr;
756 int syserr;
757 } nfs_errtbl[] = {
758 { nfs_ok, 0 },
759 { nfserr_perm, -EPERM },
760 { nfserr_noent, -ENOENT },
761 { nfserr_io, -EIO },
762 { nfserr_nxio, -ENXIO },
763 { nfserr_fbig, -E2BIG },
764 { nfserr_acces, -EACCES },
765 { nfserr_exist, -EEXIST },
766 { nfserr_xdev, -EXDEV },
767 { nfserr_mlink, -EMLINK },
768 { nfserr_nodev, -ENODEV },
769 { nfserr_notdir, -ENOTDIR },
770 { nfserr_isdir, -EISDIR },
771 { nfserr_inval, -EINVAL },
772 { nfserr_fbig, -EFBIG },
773 { nfserr_nospc, -ENOSPC },
774 { nfserr_rofs, -EROFS },
775 { nfserr_mlink, -EMLINK },
776 { nfserr_nametoolong, -ENAMETOOLONG },
777 { nfserr_notempty, -ENOTEMPTY },
778#ifdef EDQUOT
779 { nfserr_dquot, -EDQUOT },
780#endif
781 { nfserr_stale, -ESTALE },
782 { nfserr_jukebox, -ETIMEDOUT },
783 { nfserr_jukebox, -ERESTARTSYS },
784 { nfserr_jukebox, -EAGAIN },
785 { nfserr_jukebox, -EWOULDBLOCK },
786 { nfserr_jukebox, -ENOMEM },
787 { nfserr_io, -ETXTBSY },
788 { nfserr_notsupp, -EOPNOTSUPP },
789 { nfserr_toosmall, -ETOOSMALL },
790 { nfserr_serverfault, -ESERVERFAULT },
791 { nfserr_serverfault, -ENFILE },
792 { nfserr_io, -EUCLEAN },
793 { nfserr_perm, -ENOKEY },
794 };
795 int i;
796
797 for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
798 if (nfs_errtbl[i].syserr == errno)
799 return nfs_errtbl[i].nfserr;
800 }
801 WARN_ONCE(1, "nfsd: non-standard errno: %d\n", errno);
802 return nfserr_io;
803}
804
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
14typedef struct svc_rqst svc_rqst;
15typedef struct svc_buf svc_buf;
16
17#define NFSDDBG_FACILITY NFSDDBG_PROC
18
19
20static __be32
21nfsd_proc_null(struct svc_rqst *rqstp)
22{
23 return nfs_ok;
24}
25
26static __be32
27nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp)
28{
29 if (err) return err;
30 return fh_getattr(&resp->fh, &resp->stat);
31}
32static __be32
33nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
34{
35 if (err) return err;
36 return fh_getattr(&resp->fh, &resp->stat);
37}
38/*
39 * Get a file's attributes
40 * N.B. After this call resp->fh needs an fh_put
41 */
42static __be32
43nfsd_proc_getattr(struct svc_rqst *rqstp)
44{
45 struct nfsd_fhandle *argp = rqstp->rq_argp;
46 struct nfsd_attrstat *resp = rqstp->rq_resp;
47 __be32 nfserr;
48 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
49
50 fh_copy(&resp->fh, &argp->fh);
51 nfserr = fh_verify(rqstp, &resp->fh, 0,
52 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
53 return nfsd_return_attrs(nfserr, resp);
54}
55
56/*
57 * Set a file's attributes
58 * N.B. After this call resp->fh needs an fh_put
59 */
60static __be32
61nfsd_proc_setattr(struct svc_rqst *rqstp)
62{
63 struct nfsd_sattrargs *argp = rqstp->rq_argp;
64 struct nfsd_attrstat *resp = rqstp->rq_resp;
65 struct iattr *iap = &argp->attrs;
66 struct svc_fh *fhp;
67 __be32 nfserr;
68
69 dprintk("nfsd: SETATTR %s, valid=%x, size=%ld\n",
70 SVCFH_fmt(&argp->fh),
71 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
72
73 fhp = fh_copy(&resp->fh, &argp->fh);
74
75 /*
76 * NFSv2 does not differentiate between "set-[ac]time-to-now"
77 * which only requires access, and "set-[ac]time-to-X" which
78 * requires ownership.
79 * So if it looks like it might be "set both to the same time which
80 * is close to now", and if setattr_prepare fails, then we
81 * convert to "set to now" instead of "set to explicit time"
82 *
83 * We only call setattr_prepare as the last test as technically
84 * it is not an interface that we should be using.
85 */
86#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
87#define MAX_TOUCH_TIME_ERROR (30*60)
88 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
89 iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
90 /*
91 * Looks probable.
92 *
93 * Now just make sure time is in the right ballpark.
94 * Solaris, at least, doesn't seem to care what the time
95 * request is. We require it be within 30 minutes of now.
96 */
97 time_t delta = iap->ia_atime.tv_sec - get_seconds();
98
99 nfserr = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
100 if (nfserr)
101 goto done;
102
103 if (delta < 0)
104 delta = -delta;
105 if (delta < MAX_TOUCH_TIME_ERROR &&
106 setattr_prepare(fhp->fh_dentry, iap) != 0) {
107 /*
108 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
109 * This will cause notify_change to set these times
110 * to "now"
111 */
112 iap->ia_valid &= ~BOTH_TIME_SET;
113 }
114 }
115
116 nfserr = nfsd_setattr(rqstp, fhp, iap, 0, (time_t)0);
117done:
118 return nfsd_return_attrs(nfserr, resp);
119}
120
121/*
122 * Look up a path name component
123 * Note: the dentry in the resp->fh may be negative if the file
124 * doesn't exist yet.
125 * N.B. After this call resp->fh needs an fh_put
126 */
127static __be32
128nfsd_proc_lookup(struct svc_rqst *rqstp)
129{
130 struct nfsd_diropargs *argp = rqstp->rq_argp;
131 struct nfsd_diropres *resp = rqstp->rq_resp;
132 __be32 nfserr;
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 nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
139 &resp->fh);
140
141 fh_put(&argp->fh);
142 return nfsd_return_dirop(nfserr, resp);
143}
144
145/*
146 * Read a symlink.
147 */
148static __be32
149nfsd_proc_readlink(struct svc_rqst *rqstp)
150{
151 struct nfsd_readlinkargs *argp = rqstp->rq_argp;
152 struct nfsd_readlinkres *resp = rqstp->rq_resp;
153 __be32 nfserr;
154
155 dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
156
157 /* Read the symlink. */
158 resp->len = NFS_MAXPATHLEN;
159 nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
160
161 fh_put(&argp->fh);
162 return nfserr;
163}
164
165/*
166 * Read a portion of a file.
167 * N.B. After this call resp->fh needs an fh_put
168 */
169static __be32
170nfsd_proc_read(struct svc_rqst *rqstp)
171{
172 struct nfsd_readargs *argp = rqstp->rq_argp;
173 struct nfsd_readres *resp = rqstp->rq_resp;
174 __be32 nfserr;
175 u32 eof;
176
177 dprintk("nfsd: READ %s %d bytes at %d\n",
178 SVCFH_fmt(&argp->fh),
179 argp->count, argp->offset);
180
181 /* Obtain buffer pointer for payload. 19 is 1 word for
182 * status, 17 words for fattr, and 1 word for the byte count.
183 */
184
185 if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
186 char buf[RPC_MAX_ADDRBUFLEN];
187 printk(KERN_NOTICE
188 "oversized read request from %s (%d bytes)\n",
189 svc_print_addr(rqstp, buf, sizeof(buf)),
190 argp->count);
191 argp->count = NFSSVC_MAXBLKSIZE_V2;
192 }
193 svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
194
195 resp->count = argp->count;
196 nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
197 argp->offset,
198 rqstp->rq_vec, argp->vlen,
199 &resp->count,
200 &eof);
201
202 if (nfserr) return nfserr;
203 return fh_getattr(&resp->fh, &resp->stat);
204}
205
206/*
207 * Write data to a file
208 * N.B. After this call resp->fh needs an fh_put
209 */
210static __be32
211nfsd_proc_write(struct svc_rqst *rqstp)
212{
213 struct nfsd_writeargs *argp = rqstp->rq_argp;
214 struct nfsd_attrstat *resp = rqstp->rq_resp;
215 __be32 nfserr;
216 unsigned long cnt = argp->len;
217 unsigned int nvecs;
218
219 dprintk("nfsd: WRITE %s %d bytes at %d\n",
220 SVCFH_fmt(&argp->fh),
221 argp->len, argp->offset);
222
223 nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
224 &argp->first, cnt);
225 if (!nvecs)
226 return nfserr_io;
227 nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh),
228 argp->offset, rqstp->rq_vec, nvecs,
229 &cnt, NFS_DATA_SYNC);
230 return nfsd_return_attrs(nfserr, resp);
231}
232
233/*
234 * CREATE processing is complicated. The keyword here is `overloaded.'
235 * The parent directory is kept locked between the check for existence
236 * and the actual create() call in compliance with VFS protocols.
237 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
238 */
239static __be32
240nfsd_proc_create(struct svc_rqst *rqstp)
241{
242 struct nfsd_createargs *argp = rqstp->rq_argp;
243 struct nfsd_diropres *resp = rqstp->rq_resp;
244 svc_fh *dirfhp = &argp->fh;
245 svc_fh *newfhp = &resp->fh;
246 struct iattr *attr = &argp->attrs;
247 struct inode *inode;
248 struct dentry *dchild;
249 int type, mode;
250 __be32 nfserr;
251 int hosterr;
252 dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size);
253
254 dprintk("nfsd: CREATE %s %.*s\n",
255 SVCFH_fmt(dirfhp), argp->len, argp->name);
256
257 /* First verify the parent file handle */
258 nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
259 if (nfserr)
260 goto done; /* must fh_put dirfhp even on error */
261
262 /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
263
264 nfserr = nfserr_exist;
265 if (isdotent(argp->name, argp->len))
266 goto done;
267 hosterr = fh_want_write(dirfhp);
268 if (hosterr) {
269 nfserr = nfserrno(hosterr);
270 goto done;
271 }
272
273 fh_lock_nested(dirfhp, I_MUTEX_PARENT);
274 dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
275 if (IS_ERR(dchild)) {
276 nfserr = nfserrno(PTR_ERR(dchild));
277 goto out_unlock;
278 }
279 fh_init(newfhp, NFS_FHSIZE);
280 nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
281 if (!nfserr && d_really_is_negative(dchild))
282 nfserr = nfserr_noent;
283 dput(dchild);
284 if (nfserr) {
285 if (nfserr != nfserr_noent)
286 goto out_unlock;
287 /*
288 * If the new file handle wasn't verified, we can't tell
289 * whether the file exists or not. Time to bail ...
290 */
291 nfserr = nfserr_acces;
292 if (!newfhp->fh_dentry) {
293 printk(KERN_WARNING
294 "nfsd_proc_create: file handle not verified\n");
295 goto out_unlock;
296 }
297 }
298
299 inode = d_inode(newfhp->fh_dentry);
300
301 /* Unfudge the mode bits */
302 if (attr->ia_valid & ATTR_MODE) {
303 type = attr->ia_mode & S_IFMT;
304 mode = attr->ia_mode & ~S_IFMT;
305 if (!type) {
306 /* no type, so if target exists, assume same as that,
307 * else assume a file */
308 if (inode) {
309 type = inode->i_mode & S_IFMT;
310 switch(type) {
311 case S_IFCHR:
312 case S_IFBLK:
313 /* reserve rdev for later checking */
314 rdev = inode->i_rdev;
315 attr->ia_valid |= ATTR_SIZE;
316
317 /* FALLTHROUGH */
318 case S_IFIFO:
319 /* this is probably a permission check..
320 * at least IRIX implements perm checking on
321 * echo thing > device-special-file-or-pipe
322 * by doing a CREATE with type==0
323 */
324 nfserr = nfsd_permission(rqstp,
325 newfhp->fh_export,
326 newfhp->fh_dentry,
327 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
328 if (nfserr && nfserr != nfserr_rofs)
329 goto out_unlock;
330 }
331 } else
332 type = S_IFREG;
333 }
334 } else if (inode) {
335 type = inode->i_mode & S_IFMT;
336 mode = inode->i_mode & ~S_IFMT;
337 } else {
338 type = S_IFREG;
339 mode = 0; /* ??? */
340 }
341
342 attr->ia_valid |= ATTR_MODE;
343 attr->ia_mode = mode;
344
345 /* Special treatment for non-regular files according to the
346 * gospel of sun micro
347 */
348 if (type != S_IFREG) {
349 if (type != S_IFBLK && type != S_IFCHR) {
350 rdev = 0;
351 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
352 /* If you think you've seen the worst, grok this. */
353 type = S_IFIFO;
354 } else {
355 /* Okay, char or block special */
356 if (!rdev)
357 rdev = wanted;
358 }
359
360 /* we've used the SIZE information, so discard it */
361 attr->ia_valid &= ~ATTR_SIZE;
362
363 /* Make sure the type and device matches */
364 nfserr = nfserr_exist;
365 if (inode && type != (inode->i_mode & S_IFMT))
366 goto out_unlock;
367 }
368
369 nfserr = 0;
370 if (!inode) {
371 /* File doesn't exist. Create it and set attrs */
372 nfserr = nfsd_create_locked(rqstp, dirfhp, argp->name,
373 argp->len, attr, type, rdev, newfhp);
374 } else if (type == S_IFREG) {
375 dprintk("nfsd: existing %s, valid=%x, size=%ld\n",
376 argp->name, attr->ia_valid, (long) attr->ia_size);
377 /* File already exists. We ignore all attributes except
378 * size, so that creat() behaves exactly like
379 * open(..., O_CREAT|O_TRUNC|O_WRONLY).
380 */
381 attr->ia_valid &= ATTR_SIZE;
382 if (attr->ia_valid)
383 nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
384 }
385
386out_unlock:
387 /* We don't really need to unlock, as fh_put does it. */
388 fh_unlock(dirfhp);
389 fh_drop_write(dirfhp);
390done:
391 fh_put(dirfhp);
392 return nfsd_return_dirop(nfserr, resp);
393}
394
395static __be32
396nfsd_proc_remove(struct svc_rqst *rqstp)
397{
398 struct nfsd_diropargs *argp = rqstp->rq_argp;
399 __be32 nfserr;
400
401 dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh),
402 argp->len, argp->name);
403
404 /* Unlink. -SIFDIR means file must not be a directory */
405 nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
406 fh_put(&argp->fh);
407 return nfserr;
408}
409
410static __be32
411nfsd_proc_rename(struct svc_rqst *rqstp)
412{
413 struct nfsd_renameargs *argp = rqstp->rq_argp;
414 __be32 nfserr;
415
416 dprintk("nfsd: RENAME %s %.*s -> \n",
417 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
418 dprintk("nfsd: -> %s %.*s\n",
419 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
420
421 nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
422 &argp->tfh, argp->tname, argp->tlen);
423 fh_put(&argp->ffh);
424 fh_put(&argp->tfh);
425 return nfserr;
426}
427
428static __be32
429nfsd_proc_link(struct svc_rqst *rqstp)
430{
431 struct nfsd_linkargs *argp = rqstp->rq_argp;
432 __be32 nfserr;
433
434 dprintk("nfsd: LINK %s ->\n",
435 SVCFH_fmt(&argp->ffh));
436 dprintk("nfsd: %s %.*s\n",
437 SVCFH_fmt(&argp->tfh),
438 argp->tlen,
439 argp->tname);
440
441 nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
442 &argp->ffh);
443 fh_put(&argp->ffh);
444 fh_put(&argp->tfh);
445 return nfserr;
446}
447
448static __be32
449nfsd_proc_symlink(struct svc_rqst *rqstp)
450{
451 struct nfsd_symlinkargs *argp = rqstp->rq_argp;
452 struct svc_fh newfh;
453 __be32 nfserr;
454
455 if (argp->tlen > NFS_MAXPATHLEN)
456 return nfserr_nametoolong;
457
458 argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
459 page_address(rqstp->rq_arg.pages[0]),
460 argp->tlen);
461 if (IS_ERR(argp->tname))
462 return nfserrno(PTR_ERR(argp->tname));
463
464 dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n",
465 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
466 argp->tlen, argp->tname);
467
468 fh_init(&newfh, NFS_FHSIZE);
469 nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
470 argp->tname, &newfh);
471
472 kfree(argp->tname);
473 fh_put(&argp->ffh);
474 fh_put(&newfh);
475 return nfserr;
476}
477
478/*
479 * Make directory. This operation is not idempotent.
480 * N.B. After this call resp->fh needs an fh_put
481 */
482static __be32
483nfsd_proc_mkdir(struct svc_rqst *rqstp)
484{
485 struct nfsd_createargs *argp = rqstp->rq_argp;
486 struct nfsd_diropres *resp = rqstp->rq_resp;
487 __be32 nfserr;
488
489 dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
490
491 if (resp->fh.fh_dentry) {
492 printk(KERN_WARNING
493 "nfsd_proc_mkdir: response already verified??\n");
494 }
495
496 argp->attrs.ia_valid &= ~ATTR_SIZE;
497 fh_init(&resp->fh, NFS_FHSIZE);
498 nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
499 &argp->attrs, S_IFDIR, 0, &resp->fh);
500 fh_put(&argp->fh);
501 return nfsd_return_dirop(nfserr, resp);
502}
503
504/*
505 * Remove a directory
506 */
507static __be32
508nfsd_proc_rmdir(struct svc_rqst *rqstp)
509{
510 struct nfsd_diropargs *argp = rqstp->rq_argp;
511 __be32 nfserr;
512
513 dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
514
515 nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
516 fh_put(&argp->fh);
517 return nfserr;
518}
519
520/*
521 * Read a portion of a directory.
522 */
523static __be32
524nfsd_proc_readdir(struct svc_rqst *rqstp)
525{
526 struct nfsd_readdirargs *argp = rqstp->rq_argp;
527 struct nfsd_readdirres *resp = rqstp->rq_resp;
528 int count;
529 __be32 nfserr;
530 loff_t offset;
531
532 dprintk("nfsd: READDIR %s %d bytes at %d\n",
533 SVCFH_fmt(&argp->fh),
534 argp->count, argp->cookie);
535
536 /* Shrink to the client read size */
537 count = (argp->count >> 2) - 2;
538
539 /* Make sure we've room for the NULL ptr & eof flag */
540 count -= 2;
541 if (count < 0)
542 count = 0;
543
544 resp->buffer = argp->buffer;
545 resp->offset = NULL;
546 resp->buflen = count;
547 resp->common.err = nfs_ok;
548 /* Read directory and encode entries on the fly */
549 offset = argp->cookie;
550 nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
551 &resp->common, nfssvc_encode_entry);
552
553 resp->count = resp->buffer - argp->buffer;
554 if (resp->offset)
555 *resp->offset = htonl(offset);
556
557 fh_put(&argp->fh);
558 return nfserr;
559}
560
561/*
562 * Get file system info
563 */
564static __be32
565nfsd_proc_statfs(struct svc_rqst *rqstp)
566{
567 struct nfsd_fhandle *argp = rqstp->rq_argp;
568 struct nfsd_statfsres *resp = rqstp->rq_resp;
569 __be32 nfserr;
570
571 dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh));
572
573 nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
574 NFSD_MAY_BYPASS_GSS_ON_ROOT);
575 fh_put(&argp->fh);
576 return nfserr;
577}
578
579/*
580 * NFSv2 Server procedures.
581 * Only the results of non-idempotent operations are cached.
582 */
583struct nfsd_void { int dummy; };
584
585#define ST 1 /* status */
586#define FH 8 /* filehandle */
587#define AT 18 /* attributes */
588
589static const struct svc_procedure nfsd_procedures2[18] = {
590 [NFSPROC_NULL] = {
591 .pc_func = nfsd_proc_null,
592 .pc_decode = nfssvc_decode_void,
593 .pc_encode = nfssvc_encode_void,
594 .pc_argsize = sizeof(struct nfsd_void),
595 .pc_ressize = sizeof(struct nfsd_void),
596 .pc_cachetype = RC_NOCACHE,
597 .pc_xdrressize = ST,
598 },
599 [NFSPROC_GETATTR] = {
600 .pc_func = nfsd_proc_getattr,
601 .pc_decode = nfssvc_decode_fhandle,
602 .pc_encode = nfssvc_encode_attrstat,
603 .pc_release = nfssvc_release_fhandle,
604 .pc_argsize = sizeof(struct nfsd_fhandle),
605 .pc_ressize = sizeof(struct nfsd_attrstat),
606 .pc_cachetype = RC_NOCACHE,
607 .pc_xdrressize = ST+AT,
608 },
609 [NFSPROC_SETATTR] = {
610 .pc_func = nfsd_proc_setattr,
611 .pc_decode = nfssvc_decode_sattrargs,
612 .pc_encode = nfssvc_encode_attrstat,
613 .pc_release = nfssvc_release_fhandle,
614 .pc_argsize = sizeof(struct nfsd_sattrargs),
615 .pc_ressize = sizeof(struct nfsd_attrstat),
616 .pc_cachetype = RC_REPLBUFF,
617 .pc_xdrressize = ST+AT,
618 },
619 [NFSPROC_ROOT] = {
620 .pc_decode = nfssvc_decode_void,
621 .pc_encode = nfssvc_encode_void,
622 .pc_argsize = sizeof(struct nfsd_void),
623 .pc_ressize = sizeof(struct nfsd_void),
624 .pc_cachetype = RC_NOCACHE,
625 .pc_xdrressize = ST,
626 },
627 [NFSPROC_LOOKUP] = {
628 .pc_func = nfsd_proc_lookup,
629 .pc_decode = nfssvc_decode_diropargs,
630 .pc_encode = nfssvc_encode_diropres,
631 .pc_release = nfssvc_release_fhandle,
632 .pc_argsize = sizeof(struct nfsd_diropargs),
633 .pc_ressize = sizeof(struct nfsd_diropres),
634 .pc_cachetype = RC_NOCACHE,
635 .pc_xdrressize = ST+FH+AT,
636 },
637 [NFSPROC_READLINK] = {
638 .pc_func = nfsd_proc_readlink,
639 .pc_decode = nfssvc_decode_readlinkargs,
640 .pc_encode = nfssvc_encode_readlinkres,
641 .pc_argsize = sizeof(struct nfsd_readlinkargs),
642 .pc_ressize = sizeof(struct nfsd_readlinkres),
643 .pc_cachetype = RC_NOCACHE,
644 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
645 },
646 [NFSPROC_READ] = {
647 .pc_func = nfsd_proc_read,
648 .pc_decode = nfssvc_decode_readargs,
649 .pc_encode = nfssvc_encode_readres,
650 .pc_release = nfssvc_release_fhandle,
651 .pc_argsize = sizeof(struct nfsd_readargs),
652 .pc_ressize = sizeof(struct nfsd_readres),
653 .pc_cachetype = RC_NOCACHE,
654 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
655 },
656 [NFSPROC_WRITECACHE] = {
657 .pc_decode = nfssvc_decode_void,
658 .pc_encode = nfssvc_encode_void,
659 .pc_argsize = sizeof(struct nfsd_void),
660 .pc_ressize = sizeof(struct nfsd_void),
661 .pc_cachetype = RC_NOCACHE,
662 .pc_xdrressize = ST,
663 },
664 [NFSPROC_WRITE] = {
665 .pc_func = nfsd_proc_write,
666 .pc_decode = nfssvc_decode_writeargs,
667 .pc_encode = nfssvc_encode_attrstat,
668 .pc_release = nfssvc_release_fhandle,
669 .pc_argsize = sizeof(struct nfsd_writeargs),
670 .pc_ressize = sizeof(struct nfsd_attrstat),
671 .pc_cachetype = RC_REPLBUFF,
672 .pc_xdrressize = ST+AT,
673 },
674 [NFSPROC_CREATE] = {
675 .pc_func = nfsd_proc_create,
676 .pc_decode = nfssvc_decode_createargs,
677 .pc_encode = nfssvc_encode_diropres,
678 .pc_release = nfssvc_release_fhandle,
679 .pc_argsize = sizeof(struct nfsd_createargs),
680 .pc_ressize = sizeof(struct nfsd_diropres),
681 .pc_cachetype = RC_REPLBUFF,
682 .pc_xdrressize = ST+FH+AT,
683 },
684 [NFSPROC_REMOVE] = {
685 .pc_func = nfsd_proc_remove,
686 .pc_decode = nfssvc_decode_diropargs,
687 .pc_encode = nfssvc_encode_void,
688 .pc_argsize = sizeof(struct nfsd_diropargs),
689 .pc_ressize = sizeof(struct nfsd_void),
690 .pc_cachetype = RC_REPLSTAT,
691 .pc_xdrressize = ST,
692 },
693 [NFSPROC_RENAME] = {
694 .pc_func = nfsd_proc_rename,
695 .pc_decode = nfssvc_decode_renameargs,
696 .pc_encode = nfssvc_encode_void,
697 .pc_argsize = sizeof(struct nfsd_renameargs),
698 .pc_ressize = sizeof(struct nfsd_void),
699 .pc_cachetype = RC_REPLSTAT,
700 .pc_xdrressize = ST,
701 },
702 [NFSPROC_LINK] = {
703 .pc_func = nfsd_proc_link,
704 .pc_decode = nfssvc_decode_linkargs,
705 .pc_encode = nfssvc_encode_void,
706 .pc_argsize = sizeof(struct nfsd_linkargs),
707 .pc_ressize = sizeof(struct nfsd_void),
708 .pc_cachetype = RC_REPLSTAT,
709 .pc_xdrressize = ST,
710 },
711 [NFSPROC_SYMLINK] = {
712 .pc_func = nfsd_proc_symlink,
713 .pc_decode = nfssvc_decode_symlinkargs,
714 .pc_encode = nfssvc_encode_void,
715 .pc_argsize = sizeof(struct nfsd_symlinkargs),
716 .pc_ressize = sizeof(struct nfsd_void),
717 .pc_cachetype = RC_REPLSTAT,
718 .pc_xdrressize = ST,
719 },
720 [NFSPROC_MKDIR] = {
721 .pc_func = nfsd_proc_mkdir,
722 .pc_decode = nfssvc_decode_createargs,
723 .pc_encode = nfssvc_encode_diropres,
724 .pc_release = nfssvc_release_fhandle,
725 .pc_argsize = sizeof(struct nfsd_createargs),
726 .pc_ressize = sizeof(struct nfsd_diropres),
727 .pc_cachetype = RC_REPLBUFF,
728 .pc_xdrressize = ST+FH+AT,
729 },
730 [NFSPROC_RMDIR] = {
731 .pc_func = nfsd_proc_rmdir,
732 .pc_decode = nfssvc_decode_diropargs,
733 .pc_encode = nfssvc_encode_void,
734 .pc_argsize = sizeof(struct nfsd_diropargs),
735 .pc_ressize = sizeof(struct nfsd_void),
736 .pc_cachetype = RC_REPLSTAT,
737 .pc_xdrressize = ST,
738 },
739 [NFSPROC_READDIR] = {
740 .pc_func = nfsd_proc_readdir,
741 .pc_decode = nfssvc_decode_readdirargs,
742 .pc_encode = nfssvc_encode_readdirres,
743 .pc_argsize = sizeof(struct nfsd_readdirargs),
744 .pc_ressize = sizeof(struct nfsd_readdirres),
745 .pc_cachetype = RC_NOCACHE,
746 },
747 [NFSPROC_STATFS] = {
748 .pc_func = nfsd_proc_statfs,
749 .pc_decode = nfssvc_decode_fhandle,
750 .pc_encode = nfssvc_encode_statfsres,
751 .pc_argsize = sizeof(struct nfsd_fhandle),
752 .pc_ressize = sizeof(struct nfsd_statfsres),
753 .pc_cachetype = RC_NOCACHE,
754 .pc_xdrressize = ST+5,
755 },
756};
757
758
759static unsigned int nfsd_count2[ARRAY_SIZE(nfsd_procedures2)];
760const struct svc_version nfsd_version2 = {
761 .vs_vers = 2,
762 .vs_nproc = 18,
763 .vs_proc = nfsd_procedures2,
764 .vs_count = nfsd_count2,
765 .vs_dispatch = nfsd_dispatch,
766 .vs_xdrsize = NFS2_SVC_XDRSIZE,
767};
768
769/*
770 * Map errnos to NFS errnos.
771 */
772__be32
773nfserrno (int errno)
774{
775 static struct {
776 __be32 nfserr;
777 int syserr;
778 } nfs_errtbl[] = {
779 { nfs_ok, 0 },
780 { nfserr_perm, -EPERM },
781 { nfserr_noent, -ENOENT },
782 { nfserr_io, -EIO },
783 { nfserr_nxio, -ENXIO },
784 { nfserr_fbig, -E2BIG },
785 { nfserr_acces, -EACCES },
786 { nfserr_exist, -EEXIST },
787 { nfserr_xdev, -EXDEV },
788 { nfserr_mlink, -EMLINK },
789 { nfserr_nodev, -ENODEV },
790 { nfserr_notdir, -ENOTDIR },
791 { nfserr_isdir, -EISDIR },
792 { nfserr_inval, -EINVAL },
793 { nfserr_fbig, -EFBIG },
794 { nfserr_nospc, -ENOSPC },
795 { nfserr_rofs, -EROFS },
796 { nfserr_mlink, -EMLINK },
797 { nfserr_nametoolong, -ENAMETOOLONG },
798 { nfserr_notempty, -ENOTEMPTY },
799#ifdef EDQUOT
800 { nfserr_dquot, -EDQUOT },
801#endif
802 { nfserr_stale, -ESTALE },
803 { nfserr_jukebox, -ETIMEDOUT },
804 { nfserr_jukebox, -ERESTARTSYS },
805 { nfserr_jukebox, -EAGAIN },
806 { nfserr_jukebox, -EWOULDBLOCK },
807 { nfserr_jukebox, -ENOMEM },
808 { nfserr_io, -ETXTBSY },
809 { nfserr_notsupp, -EOPNOTSUPP },
810 { nfserr_toosmall, -ETOOSMALL },
811 { nfserr_serverfault, -ESERVERFAULT },
812 { nfserr_serverfault, -ENFILE },
813 { nfserr_io, -EUCLEAN },
814 { nfserr_perm, -ENOKEY },
815 };
816 int i;
817
818 for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
819 if (nfs_errtbl[i].syserr == errno)
820 return nfs_errtbl[i].nfserr;
821 }
822 WARN_ONCE(1, "nfsd: non-standard errno: %d\n", errno);
823 return nfserr_io;
824}
825