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