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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Process version 2 NFS requests.
4 *
5 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
6 */
7
8#include <linux/namei.h>
9
10#include "cache.h"
11#include "xdr.h"
12#include "vfs.h"
13
14#define NFSDDBG_FACILITY NFSDDBG_PROC
15
16static __be32
17nfsd_proc_null(struct svc_rqst *rqstp)
18{
19 return rpc_success;
20}
21
22/*
23 * Get a file's attributes
24 * N.B. After this call resp->fh needs an fh_put
25 */
26static __be32
27nfsd_proc_getattr(struct svc_rqst *rqstp)
28{
29 struct nfsd_fhandle *argp = rqstp->rq_argp;
30 struct nfsd_attrstat *resp = rqstp->rq_resp;
31
32 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
33
34 fh_copy(&resp->fh, &argp->fh);
35 resp->status = fh_verify(rqstp, &resp->fh, 0,
36 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
37 if (resp->status != nfs_ok)
38 goto out;
39 resp->status = fh_getattr(&resp->fh, &resp->stat);
40out:
41 return rpc_success;
42}
43
44/*
45 * Set a file's attributes
46 * N.B. After this call resp->fh needs an fh_put
47 */
48static __be32
49nfsd_proc_setattr(struct svc_rqst *rqstp)
50{
51 struct nfsd_sattrargs *argp = rqstp->rq_argp;
52 struct nfsd_attrstat *resp = rqstp->rq_resp;
53 struct iattr *iap = &argp->attrs;
54 struct nfsd_attrs attrs = {
55 .na_iattr = iap,
56 };
57 struct svc_fh *fhp;
58
59 dprintk("nfsd: SETATTR %s, valid=%x, size=%ld\n",
60 SVCFH_fmt(&argp->fh),
61 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
62
63 fhp = fh_copy(&resp->fh, &argp->fh);
64
65 /*
66 * NFSv2 does not differentiate between "set-[ac]time-to-now"
67 * which only requires access, and "set-[ac]time-to-X" which
68 * requires ownership.
69 * So if it looks like it might be "set both to the same time which
70 * is close to now", and if setattr_prepare fails, then we
71 * convert to "set to now" instead of "set to explicit time"
72 *
73 * We only call setattr_prepare as the last test as technically
74 * it is not an interface that we should be using.
75 */
76#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
77#define MAX_TOUCH_TIME_ERROR (30*60)
78 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
79 iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
80 /*
81 * Looks probable.
82 *
83 * Now just make sure time is in the right ballpark.
84 * Solaris, at least, doesn't seem to care what the time
85 * request is. We require it be within 30 minutes of now.
86 */
87 time64_t delta = iap->ia_atime.tv_sec - ktime_get_real_seconds();
88
89 resp->status = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
90 if (resp->status != nfs_ok)
91 goto out;
92
93 if (delta < 0)
94 delta = -delta;
95 if (delta < MAX_TOUCH_TIME_ERROR &&
96 setattr_prepare(&init_user_ns, fhp->fh_dentry, iap) != 0) {
97 /*
98 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
99 * This will cause notify_change to set these times
100 * to "now"
101 */
102 iap->ia_valid &= ~BOTH_TIME_SET;
103 }
104 }
105
106 resp->status = nfsd_setattr(rqstp, fhp, &attrs, 0, (time64_t)0);
107 if (resp->status != nfs_ok)
108 goto out;
109
110 resp->status = fh_getattr(&resp->fh, &resp->stat);
111out:
112 return rpc_success;
113}
114
115/* Obsolete, replaced by MNTPROC_MNT. */
116static __be32
117nfsd_proc_root(struct svc_rqst *rqstp)
118{
119 return rpc_success;
120}
121
122/*
123 * Look up a path name component
124 * Note: the dentry in the resp->fh may be negative if the file
125 * doesn't exist yet.
126 * N.B. After this call resp->fh needs an fh_put
127 */
128static __be32
129nfsd_proc_lookup(struct svc_rqst *rqstp)
130{
131 struct nfsd_diropargs *argp = rqstp->rq_argp;
132 struct nfsd_diropres *resp = rqstp->rq_resp;
133
134 dprintk("nfsd: LOOKUP %s %.*s\n",
135 SVCFH_fmt(&argp->fh), argp->len, argp->name);
136
137 fh_init(&resp->fh, NFS_FHSIZE);
138 resp->status = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
139 &resp->fh);
140 fh_put(&argp->fh);
141 if (resp->status != nfs_ok)
142 goto out;
143
144 resp->status = fh_getattr(&resp->fh, &resp->stat);
145out:
146 return rpc_success;
147}
148
149/*
150 * Read a symlink.
151 */
152static __be32
153nfsd_proc_readlink(struct svc_rqst *rqstp)
154{
155 struct nfsd_fhandle *argp = rqstp->rq_argp;
156 struct nfsd_readlinkres *resp = rqstp->rq_resp;
157
158 dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
159
160 /* Read the symlink. */
161 resp->len = NFS_MAXPATHLEN;
162 resp->page = *(rqstp->rq_next_page++);
163 resp->status = nfsd_readlink(rqstp, &argp->fh,
164 page_address(resp->page), &resp->len);
165
166 fh_put(&argp->fh);
167 return rpc_success;
168}
169
170/*
171 * Read a portion of a file.
172 * N.B. After this call resp->fh needs an fh_put
173 */
174static __be32
175nfsd_proc_read(struct svc_rqst *rqstp)
176{
177 struct nfsd_readargs *argp = rqstp->rq_argp;
178 struct nfsd_readres *resp = rqstp->rq_resp;
179 unsigned int len;
180 u32 eof;
181 int v;
182
183 dprintk("nfsd: READ %s %d bytes at %d\n",
184 SVCFH_fmt(&argp->fh),
185 argp->count, argp->offset);
186
187 argp->count = min_t(u32, argp->count, NFSSVC_MAXBLKSIZE_V2);
188 argp->count = min_t(u32, argp->count, rqstp->rq_res.buflen);
189
190 v = 0;
191 len = argp->count;
192 resp->pages = rqstp->rq_next_page;
193 while (len > 0) {
194 struct page *page = *(rqstp->rq_next_page++);
195
196 rqstp->rq_vec[v].iov_base = page_address(page);
197 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
198 len -= rqstp->rq_vec[v].iov_len;
199 v++;
200 }
201
202 /* Obtain buffer pointer for payload. 19 is 1 word for
203 * status, 17 words for fattr, and 1 word for the byte count.
204 */
205 svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
206
207 resp->count = argp->count;
208 fh_copy(&resp->fh, &argp->fh);
209 resp->status = nfsd_read(rqstp, &resp->fh, argp->offset,
210 rqstp->rq_vec, v, &resp->count, &eof);
211 if (resp->status == nfs_ok)
212 resp->status = fh_getattr(&resp->fh, &resp->stat);
213 else if (resp->status == nfserr_jukebox)
214 set_bit(RQ_DROPME, &rqstp->rq_flags);
215 return rpc_success;
216}
217
218/* Reserved */
219static __be32
220nfsd_proc_writecache(struct svc_rqst *rqstp)
221{
222 return rpc_success;
223}
224
225/*
226 * Write data to a file
227 * N.B. After this call resp->fh needs an fh_put
228 */
229static __be32
230nfsd_proc_write(struct svc_rqst *rqstp)
231{
232 struct nfsd_writeargs *argp = rqstp->rq_argp;
233 struct nfsd_attrstat *resp = rqstp->rq_resp;
234 unsigned long cnt = argp->len;
235 unsigned int nvecs;
236
237 dprintk("nfsd: WRITE %s %u bytes at %d\n",
238 SVCFH_fmt(&argp->fh),
239 argp->len, argp->offset);
240
241 nvecs = svc_fill_write_vector(rqstp, &argp->payload);
242
243 resp->status = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh),
244 argp->offset, rqstp->rq_vec, nvecs,
245 &cnt, NFS_DATA_SYNC, NULL);
246 if (resp->status == nfs_ok)
247 resp->status = fh_getattr(&resp->fh, &resp->stat);
248 else if (resp->status == nfserr_jukebox)
249 set_bit(RQ_DROPME, &rqstp->rq_flags);
250 return rpc_success;
251}
252
253/*
254 * CREATE processing is complicated. The keyword here is `overloaded.'
255 * The parent directory is kept locked between the check for existence
256 * and the actual create() call in compliance with VFS protocols.
257 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
258 */
259static __be32
260nfsd_proc_create(struct svc_rqst *rqstp)
261{
262 struct nfsd_createargs *argp = rqstp->rq_argp;
263 struct nfsd_diropres *resp = rqstp->rq_resp;
264 svc_fh *dirfhp = &argp->fh;
265 svc_fh *newfhp = &resp->fh;
266 struct iattr *attr = &argp->attrs;
267 struct nfsd_attrs attrs = {
268 .na_iattr = attr,
269 };
270 struct inode *inode;
271 struct dentry *dchild;
272 int type, mode;
273 int hosterr;
274 dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size);
275
276 dprintk("nfsd: CREATE %s %.*s\n",
277 SVCFH_fmt(dirfhp), argp->len, argp->name);
278
279 /* First verify the parent file handle */
280 resp->status = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
281 if (resp->status != nfs_ok)
282 goto done; /* must fh_put dirfhp even on error */
283
284 /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
285
286 resp->status = nfserr_exist;
287 if (isdotent(argp->name, argp->len))
288 goto done;
289 hosterr = fh_want_write(dirfhp);
290 if (hosterr) {
291 resp->status = nfserrno(hosterr);
292 goto done;
293 }
294
295 inode_lock_nested(dirfhp->fh_dentry->d_inode, I_MUTEX_PARENT);
296 dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
297 if (IS_ERR(dchild)) {
298 resp->status = nfserrno(PTR_ERR(dchild));
299 goto out_unlock;
300 }
301 fh_init(newfhp, NFS_FHSIZE);
302 resp->status = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
303 if (!resp->status && d_really_is_negative(dchild))
304 resp->status = nfserr_noent;
305 dput(dchild);
306 if (resp->status) {
307 if (resp->status != nfserr_noent)
308 goto out_unlock;
309 /*
310 * If the new file handle wasn't verified, we can't tell
311 * whether the file exists or not. Time to bail ...
312 */
313 resp->status = nfserr_acces;
314 if (!newfhp->fh_dentry) {
315 printk(KERN_WARNING
316 "nfsd_proc_create: file handle not verified\n");
317 goto out_unlock;
318 }
319 }
320
321 inode = d_inode(newfhp->fh_dentry);
322
323 /* Unfudge the mode bits */
324 if (attr->ia_valid & ATTR_MODE) {
325 type = attr->ia_mode & S_IFMT;
326 mode = attr->ia_mode & ~S_IFMT;
327 if (!type) {
328 /* no type, so if target exists, assume same as that,
329 * else assume a file */
330 if (inode) {
331 type = inode->i_mode & S_IFMT;
332 switch(type) {
333 case S_IFCHR:
334 case S_IFBLK:
335 /* reserve rdev for later checking */
336 rdev = inode->i_rdev;
337 attr->ia_valid |= ATTR_SIZE;
338
339 fallthrough;
340 case S_IFIFO:
341 /* this is probably a permission check..
342 * at least IRIX implements perm checking on
343 * echo thing > device-special-file-or-pipe
344 * by doing a CREATE with type==0
345 */
346 resp->status = nfsd_permission(rqstp,
347 newfhp->fh_export,
348 newfhp->fh_dentry,
349 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
350 if (resp->status && resp->status != nfserr_rofs)
351 goto out_unlock;
352 }
353 } else
354 type = S_IFREG;
355 }
356 } else if (inode) {
357 type = inode->i_mode & S_IFMT;
358 mode = inode->i_mode & ~S_IFMT;
359 } else {
360 type = S_IFREG;
361 mode = 0; /* ??? */
362 }
363
364 attr->ia_valid |= ATTR_MODE;
365 attr->ia_mode = mode;
366
367 /* Special treatment for non-regular files according to the
368 * gospel of sun micro
369 */
370 if (type != S_IFREG) {
371 if (type != S_IFBLK && type != S_IFCHR) {
372 rdev = 0;
373 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
374 /* If you think you've seen the worst, grok this. */
375 type = S_IFIFO;
376 } else {
377 /* Okay, char or block special */
378 if (!rdev)
379 rdev = wanted;
380 }
381
382 /* we've used the SIZE information, so discard it */
383 attr->ia_valid &= ~ATTR_SIZE;
384
385 /* Make sure the type and device matches */
386 resp->status = nfserr_exist;
387 if (inode && inode_wrong_type(inode, type))
388 goto out_unlock;
389 }
390
391 resp->status = nfs_ok;
392 if (!inode) {
393 /* File doesn't exist. Create it and set attrs */
394 resp->status = nfsd_create_locked(rqstp, dirfhp, &attrs, type,
395 rdev, newfhp);
396 } else if (type == S_IFREG) {
397 dprintk("nfsd: existing %s, valid=%x, size=%ld\n",
398 argp->name, attr->ia_valid, (long) attr->ia_size);
399 /* File already exists. We ignore all attributes except
400 * size, so that creat() behaves exactly like
401 * open(..., O_CREAT|O_TRUNC|O_WRONLY).
402 */
403 attr->ia_valid &= ATTR_SIZE;
404 if (attr->ia_valid)
405 resp->status = nfsd_setattr(rqstp, newfhp, &attrs, 0,
406 (time64_t)0);
407 }
408
409out_unlock:
410 inode_unlock(dirfhp->fh_dentry->d_inode);
411 fh_drop_write(dirfhp);
412done:
413 fh_put(dirfhp);
414 if (resp->status != nfs_ok)
415 goto out;
416 resp->status = fh_getattr(&resp->fh, &resp->stat);
417out:
418 return rpc_success;
419}
420
421static __be32
422nfsd_proc_remove(struct svc_rqst *rqstp)
423{
424 struct nfsd_diropargs *argp = rqstp->rq_argp;
425 struct nfsd_stat *resp = rqstp->rq_resp;
426
427 dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh),
428 argp->len, argp->name);
429
430 /* Unlink. -SIFDIR means file must not be a directory */
431 resp->status = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR,
432 argp->name, argp->len);
433 fh_put(&argp->fh);
434 return rpc_success;
435}
436
437static __be32
438nfsd_proc_rename(struct svc_rqst *rqstp)
439{
440 struct nfsd_renameargs *argp = rqstp->rq_argp;
441 struct nfsd_stat *resp = rqstp->rq_resp;
442
443 dprintk("nfsd: RENAME %s %.*s -> \n",
444 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
445 dprintk("nfsd: -> %s %.*s\n",
446 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
447
448 resp->status = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
449 &argp->tfh, argp->tname, argp->tlen);
450 fh_put(&argp->ffh);
451 fh_put(&argp->tfh);
452 return rpc_success;
453}
454
455static __be32
456nfsd_proc_link(struct svc_rqst *rqstp)
457{
458 struct nfsd_linkargs *argp = rqstp->rq_argp;
459 struct nfsd_stat *resp = rqstp->rq_resp;
460
461 dprintk("nfsd: LINK %s ->\n",
462 SVCFH_fmt(&argp->ffh));
463 dprintk("nfsd: %s %.*s\n",
464 SVCFH_fmt(&argp->tfh),
465 argp->tlen,
466 argp->tname);
467
468 resp->status = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
469 &argp->ffh);
470 fh_put(&argp->ffh);
471 fh_put(&argp->tfh);
472 return rpc_success;
473}
474
475static __be32
476nfsd_proc_symlink(struct svc_rqst *rqstp)
477{
478 struct nfsd_symlinkargs *argp = rqstp->rq_argp;
479 struct nfsd_stat *resp = rqstp->rq_resp;
480 struct nfsd_attrs attrs = {
481 .na_iattr = &argp->attrs,
482 };
483 struct svc_fh newfh;
484
485 if (argp->tlen > NFS_MAXPATHLEN) {
486 resp->status = nfserr_nametoolong;
487 goto out;
488 }
489
490 argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
491 page_address(rqstp->rq_arg.pages[0]),
492 argp->tlen);
493 if (IS_ERR(argp->tname)) {
494 resp->status = nfserrno(PTR_ERR(argp->tname));
495 goto out;
496 }
497
498 dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n",
499 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
500 argp->tlen, argp->tname);
501
502 fh_init(&newfh, NFS_FHSIZE);
503 resp->status = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
504 argp->tname, &attrs, &newfh);
505
506 kfree(argp->tname);
507 fh_put(&argp->ffh);
508 fh_put(&newfh);
509out:
510 return rpc_success;
511}
512
513/*
514 * Make directory. This operation is not idempotent.
515 * N.B. After this call resp->fh needs an fh_put
516 */
517static __be32
518nfsd_proc_mkdir(struct svc_rqst *rqstp)
519{
520 struct nfsd_createargs *argp = rqstp->rq_argp;
521 struct nfsd_diropres *resp = rqstp->rq_resp;
522 struct nfsd_attrs attrs = {
523 .na_iattr = &argp->attrs,
524 };
525
526 dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
527
528 if (resp->fh.fh_dentry) {
529 printk(KERN_WARNING
530 "nfsd_proc_mkdir: response already verified??\n");
531 }
532
533 argp->attrs.ia_valid &= ~ATTR_SIZE;
534 fh_init(&resp->fh, NFS_FHSIZE);
535 resp->status = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
536 &attrs, S_IFDIR, 0, &resp->fh);
537 fh_put(&argp->fh);
538 if (resp->status != nfs_ok)
539 goto out;
540
541 resp->status = fh_getattr(&resp->fh, &resp->stat);
542out:
543 return rpc_success;
544}
545
546/*
547 * Remove a directory
548 */
549static __be32
550nfsd_proc_rmdir(struct svc_rqst *rqstp)
551{
552 struct nfsd_diropargs *argp = rqstp->rq_argp;
553 struct nfsd_stat *resp = rqstp->rq_resp;
554
555 dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
556
557 resp->status = nfsd_unlink(rqstp, &argp->fh, S_IFDIR,
558 argp->name, argp->len);
559 fh_put(&argp->fh);
560 return rpc_success;
561}
562
563static void nfsd_init_dirlist_pages(struct svc_rqst *rqstp,
564 struct nfsd_readdirres *resp,
565 u32 count)
566{
567 struct xdr_buf *buf = &resp->dirlist;
568 struct xdr_stream *xdr = &resp->xdr;
569
570 memset(buf, 0, sizeof(*buf));
571
572 /* Reserve room for the NULL ptr & eof flag (-2 words) */
573 buf->buflen = clamp(count, (u32)(XDR_UNIT * 2), (u32)PAGE_SIZE);
574 buf->buflen -= XDR_UNIT * 2;
575 buf->pages = rqstp->rq_next_page;
576 rqstp->rq_next_page++;
577
578 xdr_init_encode_pages(xdr, buf, buf->pages, NULL);
579}
580
581/*
582 * Read a portion of a directory.
583 */
584static __be32
585nfsd_proc_readdir(struct svc_rqst *rqstp)
586{
587 struct nfsd_readdirargs *argp = rqstp->rq_argp;
588 struct nfsd_readdirres *resp = rqstp->rq_resp;
589 loff_t offset;
590
591 dprintk("nfsd: READDIR %s %d bytes at %d\n",
592 SVCFH_fmt(&argp->fh),
593 argp->count, argp->cookie);
594
595 nfsd_init_dirlist_pages(rqstp, resp, argp->count);
596
597 resp->common.err = nfs_ok;
598 resp->cookie_offset = 0;
599 offset = argp->cookie;
600 resp->status = nfsd_readdir(rqstp, &argp->fh, &offset,
601 &resp->common, nfssvc_encode_entry);
602 nfssvc_encode_nfscookie(resp, offset);
603
604 fh_put(&argp->fh);
605 return rpc_success;
606}
607
608/*
609 * Get file system info
610 */
611static __be32
612nfsd_proc_statfs(struct svc_rqst *rqstp)
613{
614 struct nfsd_fhandle *argp = rqstp->rq_argp;
615 struct nfsd_statfsres *resp = rqstp->rq_resp;
616
617 dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh));
618
619 resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
620 NFSD_MAY_BYPASS_GSS_ON_ROOT);
621 fh_put(&argp->fh);
622 return rpc_success;
623}
624
625/*
626 * NFSv2 Server procedures.
627 * Only the results of non-idempotent operations are cached.
628 */
629
630#define ST 1 /* status */
631#define FH 8 /* filehandle */
632#define AT 18 /* attributes */
633
634static const struct svc_procedure nfsd_procedures2[18] = {
635 [NFSPROC_NULL] = {
636 .pc_func = nfsd_proc_null,
637 .pc_decode = nfssvc_decode_voidarg,
638 .pc_encode = nfssvc_encode_voidres,
639 .pc_argsize = sizeof(struct nfsd_voidargs),
640 .pc_argzero = sizeof(struct nfsd_voidargs),
641 .pc_ressize = sizeof(struct nfsd_voidres),
642 .pc_cachetype = RC_NOCACHE,
643 .pc_xdrressize = 0,
644 .pc_name = "NULL",
645 },
646 [NFSPROC_GETATTR] = {
647 .pc_func = nfsd_proc_getattr,
648 .pc_decode = nfssvc_decode_fhandleargs,
649 .pc_encode = nfssvc_encode_attrstatres,
650 .pc_release = nfssvc_release_attrstat,
651 .pc_argsize = sizeof(struct nfsd_fhandle),
652 .pc_argzero = sizeof(struct nfsd_fhandle),
653 .pc_ressize = sizeof(struct nfsd_attrstat),
654 .pc_cachetype = RC_NOCACHE,
655 .pc_xdrressize = ST+AT,
656 .pc_name = "GETATTR",
657 },
658 [NFSPROC_SETATTR] = {
659 .pc_func = nfsd_proc_setattr,
660 .pc_decode = nfssvc_decode_sattrargs,
661 .pc_encode = nfssvc_encode_attrstatres,
662 .pc_release = nfssvc_release_attrstat,
663 .pc_argsize = sizeof(struct nfsd_sattrargs),
664 .pc_argzero = sizeof(struct nfsd_sattrargs),
665 .pc_ressize = sizeof(struct nfsd_attrstat),
666 .pc_cachetype = RC_REPLBUFF,
667 .pc_xdrressize = ST+AT,
668 .pc_name = "SETATTR",
669 },
670 [NFSPROC_ROOT] = {
671 .pc_func = nfsd_proc_root,
672 .pc_decode = nfssvc_decode_voidarg,
673 .pc_encode = nfssvc_encode_voidres,
674 .pc_argsize = sizeof(struct nfsd_voidargs),
675 .pc_argzero = sizeof(struct nfsd_voidargs),
676 .pc_ressize = sizeof(struct nfsd_voidres),
677 .pc_cachetype = RC_NOCACHE,
678 .pc_xdrressize = 0,
679 .pc_name = "ROOT",
680 },
681 [NFSPROC_LOOKUP] = {
682 .pc_func = nfsd_proc_lookup,
683 .pc_decode = nfssvc_decode_diropargs,
684 .pc_encode = nfssvc_encode_diropres,
685 .pc_release = nfssvc_release_diropres,
686 .pc_argsize = sizeof(struct nfsd_diropargs),
687 .pc_argzero = sizeof(struct nfsd_diropargs),
688 .pc_ressize = sizeof(struct nfsd_diropres),
689 .pc_cachetype = RC_NOCACHE,
690 .pc_xdrressize = ST+FH+AT,
691 .pc_name = "LOOKUP",
692 },
693 [NFSPROC_READLINK] = {
694 .pc_func = nfsd_proc_readlink,
695 .pc_decode = nfssvc_decode_fhandleargs,
696 .pc_encode = nfssvc_encode_readlinkres,
697 .pc_argsize = sizeof(struct nfsd_fhandle),
698 .pc_argzero = sizeof(struct nfsd_fhandle),
699 .pc_ressize = sizeof(struct nfsd_readlinkres),
700 .pc_cachetype = RC_NOCACHE,
701 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
702 .pc_name = "READLINK",
703 },
704 [NFSPROC_READ] = {
705 .pc_func = nfsd_proc_read,
706 .pc_decode = nfssvc_decode_readargs,
707 .pc_encode = nfssvc_encode_readres,
708 .pc_release = nfssvc_release_readres,
709 .pc_argsize = sizeof(struct nfsd_readargs),
710 .pc_argzero = sizeof(struct nfsd_readargs),
711 .pc_ressize = sizeof(struct nfsd_readres),
712 .pc_cachetype = RC_NOCACHE,
713 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
714 .pc_name = "READ",
715 },
716 [NFSPROC_WRITECACHE] = {
717 .pc_func = nfsd_proc_writecache,
718 .pc_decode = nfssvc_decode_voidarg,
719 .pc_encode = nfssvc_encode_voidres,
720 .pc_argsize = sizeof(struct nfsd_voidargs),
721 .pc_argzero = sizeof(struct nfsd_voidargs),
722 .pc_ressize = sizeof(struct nfsd_voidres),
723 .pc_cachetype = RC_NOCACHE,
724 .pc_xdrressize = 0,
725 .pc_name = "WRITECACHE",
726 },
727 [NFSPROC_WRITE] = {
728 .pc_func = nfsd_proc_write,
729 .pc_decode = nfssvc_decode_writeargs,
730 .pc_encode = nfssvc_encode_attrstatres,
731 .pc_release = nfssvc_release_attrstat,
732 .pc_argsize = sizeof(struct nfsd_writeargs),
733 .pc_argzero = sizeof(struct nfsd_writeargs),
734 .pc_ressize = sizeof(struct nfsd_attrstat),
735 .pc_cachetype = RC_REPLBUFF,
736 .pc_xdrressize = ST+AT,
737 .pc_name = "WRITE",
738 },
739 [NFSPROC_CREATE] = {
740 .pc_func = nfsd_proc_create,
741 .pc_decode = nfssvc_decode_createargs,
742 .pc_encode = nfssvc_encode_diropres,
743 .pc_release = nfssvc_release_diropres,
744 .pc_argsize = sizeof(struct nfsd_createargs),
745 .pc_argzero = sizeof(struct nfsd_createargs),
746 .pc_ressize = sizeof(struct nfsd_diropres),
747 .pc_cachetype = RC_REPLBUFF,
748 .pc_xdrressize = ST+FH+AT,
749 .pc_name = "CREATE",
750 },
751 [NFSPROC_REMOVE] = {
752 .pc_func = nfsd_proc_remove,
753 .pc_decode = nfssvc_decode_diropargs,
754 .pc_encode = nfssvc_encode_statres,
755 .pc_argsize = sizeof(struct nfsd_diropargs),
756 .pc_argzero = sizeof(struct nfsd_diropargs),
757 .pc_ressize = sizeof(struct nfsd_stat),
758 .pc_cachetype = RC_REPLSTAT,
759 .pc_xdrressize = ST,
760 .pc_name = "REMOVE",
761 },
762 [NFSPROC_RENAME] = {
763 .pc_func = nfsd_proc_rename,
764 .pc_decode = nfssvc_decode_renameargs,
765 .pc_encode = nfssvc_encode_statres,
766 .pc_argsize = sizeof(struct nfsd_renameargs),
767 .pc_argzero = sizeof(struct nfsd_renameargs),
768 .pc_ressize = sizeof(struct nfsd_stat),
769 .pc_cachetype = RC_REPLSTAT,
770 .pc_xdrressize = ST,
771 .pc_name = "RENAME",
772 },
773 [NFSPROC_LINK] = {
774 .pc_func = nfsd_proc_link,
775 .pc_decode = nfssvc_decode_linkargs,
776 .pc_encode = nfssvc_encode_statres,
777 .pc_argsize = sizeof(struct nfsd_linkargs),
778 .pc_argzero = sizeof(struct nfsd_linkargs),
779 .pc_ressize = sizeof(struct nfsd_stat),
780 .pc_cachetype = RC_REPLSTAT,
781 .pc_xdrressize = ST,
782 .pc_name = "LINK",
783 },
784 [NFSPROC_SYMLINK] = {
785 .pc_func = nfsd_proc_symlink,
786 .pc_decode = nfssvc_decode_symlinkargs,
787 .pc_encode = nfssvc_encode_statres,
788 .pc_argsize = sizeof(struct nfsd_symlinkargs),
789 .pc_argzero = sizeof(struct nfsd_symlinkargs),
790 .pc_ressize = sizeof(struct nfsd_stat),
791 .pc_cachetype = RC_REPLSTAT,
792 .pc_xdrressize = ST,
793 .pc_name = "SYMLINK",
794 },
795 [NFSPROC_MKDIR] = {
796 .pc_func = nfsd_proc_mkdir,
797 .pc_decode = nfssvc_decode_createargs,
798 .pc_encode = nfssvc_encode_diropres,
799 .pc_release = nfssvc_release_diropres,
800 .pc_argsize = sizeof(struct nfsd_createargs),
801 .pc_argzero = sizeof(struct nfsd_createargs),
802 .pc_ressize = sizeof(struct nfsd_diropres),
803 .pc_cachetype = RC_REPLBUFF,
804 .pc_xdrressize = ST+FH+AT,
805 .pc_name = "MKDIR",
806 },
807 [NFSPROC_RMDIR] = {
808 .pc_func = nfsd_proc_rmdir,
809 .pc_decode = nfssvc_decode_diropargs,
810 .pc_encode = nfssvc_encode_statres,
811 .pc_argsize = sizeof(struct nfsd_diropargs),
812 .pc_argzero = sizeof(struct nfsd_diropargs),
813 .pc_ressize = sizeof(struct nfsd_stat),
814 .pc_cachetype = RC_REPLSTAT,
815 .pc_xdrressize = ST,
816 .pc_name = "RMDIR",
817 },
818 [NFSPROC_READDIR] = {
819 .pc_func = nfsd_proc_readdir,
820 .pc_decode = nfssvc_decode_readdirargs,
821 .pc_encode = nfssvc_encode_readdirres,
822 .pc_argsize = sizeof(struct nfsd_readdirargs),
823 .pc_argzero = sizeof(struct nfsd_readdirargs),
824 .pc_ressize = sizeof(struct nfsd_readdirres),
825 .pc_cachetype = RC_NOCACHE,
826 .pc_name = "READDIR",
827 },
828 [NFSPROC_STATFS] = {
829 .pc_func = nfsd_proc_statfs,
830 .pc_decode = nfssvc_decode_fhandleargs,
831 .pc_encode = nfssvc_encode_statfsres,
832 .pc_argsize = sizeof(struct nfsd_fhandle),
833 .pc_argzero = sizeof(struct nfsd_fhandle),
834 .pc_ressize = sizeof(struct nfsd_statfsres),
835 .pc_cachetype = RC_NOCACHE,
836 .pc_xdrressize = ST+5,
837 .pc_name = "STATFS",
838 },
839};
840
841
842static unsigned int nfsd_count2[ARRAY_SIZE(nfsd_procedures2)];
843const struct svc_version nfsd_version2 = {
844 .vs_vers = 2,
845 .vs_nproc = 18,
846 .vs_proc = nfsd_procedures2,
847 .vs_count = nfsd_count2,
848 .vs_dispatch = nfsd_dispatch,
849 .vs_xdrsize = NFS2_SVC_XDRSIZE,
850};
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
176 dprintk("nfsd: READ %s %d bytes at %d\n",
177 SVCFH_fmt(&argp->fh),
178 argp->count, argp->offset);
179
180 /* Obtain buffer pointer for payload. 19 is 1 word for
181 * status, 17 words for fattr, and 1 word for the byte count.
182 */
183
184 if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
185 char buf[RPC_MAX_ADDRBUFLEN];
186 printk(KERN_NOTICE
187 "oversized read request from %s (%d bytes)\n",
188 svc_print_addr(rqstp, buf, sizeof(buf)),
189 argp->count);
190 argp->count = NFSSVC_MAXBLKSIZE_V2;
191 }
192 svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
193
194 resp->count = argp->count;
195 nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
196 argp->offset,
197 rqstp->rq_vec, argp->vlen,
198 &resp->count);
199
200 if (nfserr) return nfserr;
201 return fh_getattr(&resp->fh, &resp->stat);
202}
203
204/*
205 * Write data to a file
206 * N.B. After this call resp->fh needs an fh_put
207 */
208static __be32
209nfsd_proc_write(struct svc_rqst *rqstp)
210{
211 struct nfsd_writeargs *argp = rqstp->rq_argp;
212 struct nfsd_attrstat *resp = rqstp->rq_resp;
213 __be32 nfserr;
214 unsigned long cnt = argp->len;
215 unsigned int nvecs;
216
217 dprintk("nfsd: WRITE %s %d bytes at %d\n",
218 SVCFH_fmt(&argp->fh),
219 argp->len, argp->offset);
220
221 nvecs = svc_fill_write_vector(rqstp, &argp->first, cnt);
222 if (!nvecs)
223 return nfserr_io;
224 nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh),
225 argp->offset, rqstp->rq_vec, nvecs,
226 &cnt, NFS_DATA_SYNC);
227 return nfsd_return_attrs(nfserr, resp);
228}
229
230/*
231 * CREATE processing is complicated. The keyword here is `overloaded.'
232 * The parent directory is kept locked between the check for existence
233 * and the actual create() call in compliance with VFS protocols.
234 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
235 */
236static __be32
237nfsd_proc_create(struct svc_rqst *rqstp)
238{
239 struct nfsd_createargs *argp = rqstp->rq_argp;
240 struct nfsd_diropres *resp = rqstp->rq_resp;
241 svc_fh *dirfhp = &argp->fh;
242 svc_fh *newfhp = &resp->fh;
243 struct iattr *attr = &argp->attrs;
244 struct inode *inode;
245 struct dentry *dchild;
246 int type, mode;
247 __be32 nfserr;
248 int hosterr;
249 dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size);
250
251 dprintk("nfsd: CREATE %s %.*s\n",
252 SVCFH_fmt(dirfhp), argp->len, argp->name);
253
254 /* First verify the parent file handle */
255 nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
256 if (nfserr)
257 goto done; /* must fh_put dirfhp even on error */
258
259 /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
260
261 nfserr = nfserr_exist;
262 if (isdotent(argp->name, argp->len))
263 goto done;
264 hosterr = fh_want_write(dirfhp);
265 if (hosterr) {
266 nfserr = nfserrno(hosterr);
267 goto done;
268 }
269
270 fh_lock_nested(dirfhp, I_MUTEX_PARENT);
271 dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
272 if (IS_ERR(dchild)) {
273 nfserr = nfserrno(PTR_ERR(dchild));
274 goto out_unlock;
275 }
276 fh_init(newfhp, NFS_FHSIZE);
277 nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
278 if (!nfserr && d_really_is_negative(dchild))
279 nfserr = nfserr_noent;
280 dput(dchild);
281 if (nfserr) {
282 if (nfserr != nfserr_noent)
283 goto out_unlock;
284 /*
285 * If the new file handle wasn't verified, we can't tell
286 * whether the file exists or not. Time to bail ...
287 */
288 nfserr = nfserr_acces;
289 if (!newfhp->fh_dentry) {
290 printk(KERN_WARNING
291 "nfsd_proc_create: file handle not verified\n");
292 goto out_unlock;
293 }
294 }
295
296 inode = d_inode(newfhp->fh_dentry);
297
298 /* Unfudge the mode bits */
299 if (attr->ia_valid & ATTR_MODE) {
300 type = attr->ia_mode & S_IFMT;
301 mode = attr->ia_mode & ~S_IFMT;
302 if (!type) {
303 /* no type, so if target exists, assume same as that,
304 * else assume a file */
305 if (inode) {
306 type = inode->i_mode & S_IFMT;
307 switch(type) {
308 case S_IFCHR:
309 case S_IFBLK:
310 /* reserve rdev for later checking */
311 rdev = inode->i_rdev;
312 attr->ia_valid |= ATTR_SIZE;
313
314 /* FALLTHROUGH */
315 case S_IFIFO:
316 /* this is probably a permission check..
317 * at least IRIX implements perm checking on
318 * echo thing > device-special-file-or-pipe
319 * by doing a CREATE with type==0
320 */
321 nfserr = nfsd_permission(rqstp,
322 newfhp->fh_export,
323 newfhp->fh_dentry,
324 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
325 if (nfserr && nfserr != nfserr_rofs)
326 goto out_unlock;
327 }
328 } else
329 type = S_IFREG;
330 }
331 } else if (inode) {
332 type = inode->i_mode & S_IFMT;
333 mode = inode->i_mode & ~S_IFMT;
334 } else {
335 type = S_IFREG;
336 mode = 0; /* ??? */
337 }
338
339 attr->ia_valid |= ATTR_MODE;
340 attr->ia_mode = mode;
341
342 /* Special treatment for non-regular files according to the
343 * gospel of sun micro
344 */
345 if (type != S_IFREG) {
346 if (type != S_IFBLK && type != S_IFCHR) {
347 rdev = 0;
348 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
349 /* If you think you've seen the worst, grok this. */
350 type = S_IFIFO;
351 } else {
352 /* Okay, char or block special */
353 if (!rdev)
354 rdev = wanted;
355 }
356
357 /* we've used the SIZE information, so discard it */
358 attr->ia_valid &= ~ATTR_SIZE;
359
360 /* Make sure the type and device matches */
361 nfserr = nfserr_exist;
362 if (inode && type != (inode->i_mode & S_IFMT))
363 goto out_unlock;
364 }
365
366 nfserr = 0;
367 if (!inode) {
368 /* File doesn't exist. Create it and set attrs */
369 nfserr = nfsd_create_locked(rqstp, dirfhp, argp->name,
370 argp->len, attr, type, rdev, newfhp);
371 } else if (type == S_IFREG) {
372 dprintk("nfsd: existing %s, valid=%x, size=%ld\n",
373 argp->name, attr->ia_valid, (long) attr->ia_size);
374 /* File already exists. We ignore all attributes except
375 * size, so that creat() behaves exactly like
376 * open(..., O_CREAT|O_TRUNC|O_WRONLY).
377 */
378 attr->ia_valid &= ATTR_SIZE;
379 if (attr->ia_valid)
380 nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
381 }
382
383out_unlock:
384 /* We don't really need to unlock, as fh_put does it. */
385 fh_unlock(dirfhp);
386 fh_drop_write(dirfhp);
387done:
388 fh_put(dirfhp);
389 return nfsd_return_dirop(nfserr, resp);
390}
391
392static __be32
393nfsd_proc_remove(struct svc_rqst *rqstp)
394{
395 struct nfsd_diropargs *argp = rqstp->rq_argp;
396 __be32 nfserr;
397
398 dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh),
399 argp->len, argp->name);
400
401 /* Unlink. -SIFDIR means file must not be a directory */
402 nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
403 fh_put(&argp->fh);
404 return nfserr;
405}
406
407static __be32
408nfsd_proc_rename(struct svc_rqst *rqstp)
409{
410 struct nfsd_renameargs *argp = rqstp->rq_argp;
411 __be32 nfserr;
412
413 dprintk("nfsd: RENAME %s %.*s -> \n",
414 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
415 dprintk("nfsd: -> %s %.*s\n",
416 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
417
418 nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
419 &argp->tfh, argp->tname, argp->tlen);
420 fh_put(&argp->ffh);
421 fh_put(&argp->tfh);
422 return nfserr;
423}
424
425static __be32
426nfsd_proc_link(struct svc_rqst *rqstp)
427{
428 struct nfsd_linkargs *argp = rqstp->rq_argp;
429 __be32 nfserr;
430
431 dprintk("nfsd: LINK %s ->\n",
432 SVCFH_fmt(&argp->ffh));
433 dprintk("nfsd: %s %.*s\n",
434 SVCFH_fmt(&argp->tfh),
435 argp->tlen,
436 argp->tname);
437
438 nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
439 &argp->ffh);
440 fh_put(&argp->ffh);
441 fh_put(&argp->tfh);
442 return nfserr;
443}
444
445static __be32
446nfsd_proc_symlink(struct svc_rqst *rqstp)
447{
448 struct nfsd_symlinkargs *argp = rqstp->rq_argp;
449 struct svc_fh newfh;
450 __be32 nfserr;
451
452 if (argp->tlen > NFS_MAXPATHLEN)
453 return nfserr_nametoolong;
454
455 argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
456 argp->tlen);
457 if (IS_ERR(argp->tname))
458 return nfserrno(PTR_ERR(argp->tname));
459
460 dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n",
461 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
462 argp->tlen, argp->tname);
463
464 fh_init(&newfh, NFS_FHSIZE);
465 nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
466 argp->tname, &newfh);
467
468 fh_put(&argp->ffh);
469 fh_put(&newfh);
470 return nfserr;
471}
472
473/*
474 * Make directory. This operation is not idempotent.
475 * N.B. After this call resp->fh needs an fh_put
476 */
477static __be32
478nfsd_proc_mkdir(struct svc_rqst *rqstp)
479{
480 struct nfsd_createargs *argp = rqstp->rq_argp;
481 struct nfsd_diropres *resp = rqstp->rq_resp;
482 __be32 nfserr;
483
484 dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
485
486 if (resp->fh.fh_dentry) {
487 printk(KERN_WARNING
488 "nfsd_proc_mkdir: response already verified??\n");
489 }
490
491 argp->attrs.ia_valid &= ~ATTR_SIZE;
492 fh_init(&resp->fh, NFS_FHSIZE);
493 nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
494 &argp->attrs, S_IFDIR, 0, &resp->fh);
495 fh_put(&argp->fh);
496 return nfsd_return_dirop(nfserr, resp);
497}
498
499/*
500 * Remove a directory
501 */
502static __be32
503nfsd_proc_rmdir(struct svc_rqst *rqstp)
504{
505 struct nfsd_diropargs *argp = rqstp->rq_argp;
506 __be32 nfserr;
507
508 dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
509
510 nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
511 fh_put(&argp->fh);
512 return nfserr;
513}
514
515/*
516 * Read a portion of a directory.
517 */
518static __be32
519nfsd_proc_readdir(struct svc_rqst *rqstp)
520{
521 struct nfsd_readdirargs *argp = rqstp->rq_argp;
522 struct nfsd_readdirres *resp = rqstp->rq_resp;
523 int count;
524 __be32 nfserr;
525 loff_t offset;
526
527 dprintk("nfsd: READDIR %s %d bytes at %d\n",
528 SVCFH_fmt(&argp->fh),
529 argp->count, argp->cookie);
530
531 /* Shrink to the client read size */
532 count = (argp->count >> 2) - 2;
533
534 /* Make sure we've room for the NULL ptr & eof flag */
535 count -= 2;
536 if (count < 0)
537 count = 0;
538
539 resp->buffer = argp->buffer;
540 resp->offset = NULL;
541 resp->buflen = count;
542 resp->common.err = nfs_ok;
543 /* Read directory and encode entries on the fly */
544 offset = argp->cookie;
545 nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
546 &resp->common, nfssvc_encode_entry);
547
548 resp->count = resp->buffer - argp->buffer;
549 if (resp->offset)
550 *resp->offset = htonl(offset);
551
552 fh_put(&argp->fh);
553 return nfserr;
554}
555
556/*
557 * Get file system info
558 */
559static __be32
560nfsd_proc_statfs(struct svc_rqst *rqstp)
561{
562 struct nfsd_fhandle *argp = rqstp->rq_argp;
563 struct nfsd_statfsres *resp = rqstp->rq_resp;
564 __be32 nfserr;
565
566 dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh));
567
568 nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
569 NFSD_MAY_BYPASS_GSS_ON_ROOT);
570 fh_put(&argp->fh);
571 return nfserr;
572}
573
574/*
575 * NFSv2 Server procedures.
576 * Only the results of non-idempotent operations are cached.
577 */
578struct nfsd_void { int dummy; };
579
580#define ST 1 /* status */
581#define FH 8 /* filehandle */
582#define AT 18 /* attributes */
583
584static const struct svc_procedure nfsd_procedures2[18] = {
585 [NFSPROC_NULL] = {
586 .pc_func = nfsd_proc_null,
587 .pc_decode = nfssvc_decode_void,
588 .pc_encode = nfssvc_encode_void,
589 .pc_argsize = sizeof(struct nfsd_void),
590 .pc_ressize = sizeof(struct nfsd_void),
591 .pc_cachetype = RC_NOCACHE,
592 .pc_xdrressize = ST,
593 },
594 [NFSPROC_GETATTR] = {
595 .pc_func = nfsd_proc_getattr,
596 .pc_decode = nfssvc_decode_fhandle,
597 .pc_encode = nfssvc_encode_attrstat,
598 .pc_release = nfssvc_release_fhandle,
599 .pc_argsize = sizeof(struct nfsd_fhandle),
600 .pc_ressize = sizeof(struct nfsd_attrstat),
601 .pc_cachetype = RC_NOCACHE,
602 .pc_xdrressize = ST+AT,
603 },
604 [NFSPROC_SETATTR] = {
605 .pc_func = nfsd_proc_setattr,
606 .pc_decode = nfssvc_decode_sattrargs,
607 .pc_encode = nfssvc_encode_attrstat,
608 .pc_release = nfssvc_release_fhandle,
609 .pc_argsize = sizeof(struct nfsd_sattrargs),
610 .pc_ressize = sizeof(struct nfsd_attrstat),
611 .pc_cachetype = RC_REPLBUFF,
612 .pc_xdrressize = ST+AT,
613 },
614 [NFSPROC_ROOT] = {
615 .pc_decode = nfssvc_decode_void,
616 .pc_encode = nfssvc_encode_void,
617 .pc_argsize = sizeof(struct nfsd_void),
618 .pc_ressize = sizeof(struct nfsd_void),
619 .pc_cachetype = RC_NOCACHE,
620 .pc_xdrressize = ST,
621 },
622 [NFSPROC_LOOKUP] = {
623 .pc_func = nfsd_proc_lookup,
624 .pc_decode = nfssvc_decode_diropargs,
625 .pc_encode = nfssvc_encode_diropres,
626 .pc_release = nfssvc_release_fhandle,
627 .pc_argsize = sizeof(struct nfsd_diropargs),
628 .pc_ressize = sizeof(struct nfsd_diropres),
629 .pc_cachetype = RC_NOCACHE,
630 .pc_xdrressize = ST+FH+AT,
631 },
632 [NFSPROC_READLINK] = {
633 .pc_func = nfsd_proc_readlink,
634 .pc_decode = nfssvc_decode_readlinkargs,
635 .pc_encode = nfssvc_encode_readlinkres,
636 .pc_argsize = sizeof(struct nfsd_readlinkargs),
637 .pc_ressize = sizeof(struct nfsd_readlinkres),
638 .pc_cachetype = RC_NOCACHE,
639 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
640 },
641 [NFSPROC_READ] = {
642 .pc_func = nfsd_proc_read,
643 .pc_decode = nfssvc_decode_readargs,
644 .pc_encode = nfssvc_encode_readres,
645 .pc_release = nfssvc_release_fhandle,
646 .pc_argsize = sizeof(struct nfsd_readargs),
647 .pc_ressize = sizeof(struct nfsd_readres),
648 .pc_cachetype = RC_NOCACHE,
649 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
650 },
651 [NFSPROC_WRITECACHE] = {
652 .pc_decode = nfssvc_decode_void,
653 .pc_encode = nfssvc_encode_void,
654 .pc_argsize = sizeof(struct nfsd_void),
655 .pc_ressize = sizeof(struct nfsd_void),
656 .pc_cachetype = RC_NOCACHE,
657 .pc_xdrressize = ST,
658 },
659 [NFSPROC_WRITE] = {
660 .pc_func = nfsd_proc_write,
661 .pc_decode = nfssvc_decode_writeargs,
662 .pc_encode = nfssvc_encode_attrstat,
663 .pc_release = nfssvc_release_fhandle,
664 .pc_argsize = sizeof(struct nfsd_writeargs),
665 .pc_ressize = sizeof(struct nfsd_attrstat),
666 .pc_cachetype = RC_REPLBUFF,
667 .pc_xdrressize = ST+AT,
668 },
669 [NFSPROC_CREATE] = {
670 .pc_func = nfsd_proc_create,
671 .pc_decode = nfssvc_decode_createargs,
672 .pc_encode = nfssvc_encode_diropres,
673 .pc_release = nfssvc_release_fhandle,
674 .pc_argsize = sizeof(struct nfsd_createargs),
675 .pc_ressize = sizeof(struct nfsd_diropres),
676 .pc_cachetype = RC_REPLBUFF,
677 .pc_xdrressize = ST+FH+AT,
678 },
679 [NFSPROC_REMOVE] = {
680 .pc_func = nfsd_proc_remove,
681 .pc_decode = nfssvc_decode_diropargs,
682 .pc_encode = nfssvc_encode_void,
683 .pc_argsize = sizeof(struct nfsd_diropargs),
684 .pc_ressize = sizeof(struct nfsd_void),
685 .pc_cachetype = RC_REPLSTAT,
686 .pc_xdrressize = ST,
687 },
688 [NFSPROC_RENAME] = {
689 .pc_func = nfsd_proc_rename,
690 .pc_decode = nfssvc_decode_renameargs,
691 .pc_encode = nfssvc_encode_void,
692 .pc_argsize = sizeof(struct nfsd_renameargs),
693 .pc_ressize = sizeof(struct nfsd_void),
694 .pc_cachetype = RC_REPLSTAT,
695 .pc_xdrressize = ST,
696 },
697 [NFSPROC_LINK] = {
698 .pc_func = nfsd_proc_link,
699 .pc_decode = nfssvc_decode_linkargs,
700 .pc_encode = nfssvc_encode_void,
701 .pc_argsize = sizeof(struct nfsd_linkargs),
702 .pc_ressize = sizeof(struct nfsd_void),
703 .pc_cachetype = RC_REPLSTAT,
704 .pc_xdrressize = ST,
705 },
706 [NFSPROC_SYMLINK] = {
707 .pc_func = nfsd_proc_symlink,
708 .pc_decode = nfssvc_decode_symlinkargs,
709 .pc_encode = nfssvc_encode_void,
710 .pc_argsize = sizeof(struct nfsd_symlinkargs),
711 .pc_ressize = sizeof(struct nfsd_void),
712 .pc_cachetype = RC_REPLSTAT,
713 .pc_xdrressize = ST,
714 },
715 [NFSPROC_MKDIR] = {
716 .pc_func = nfsd_proc_mkdir,
717 .pc_decode = nfssvc_decode_createargs,
718 .pc_encode = nfssvc_encode_diropres,
719 .pc_release = nfssvc_release_fhandle,
720 .pc_argsize = sizeof(struct nfsd_createargs),
721 .pc_ressize = sizeof(struct nfsd_diropres),
722 .pc_cachetype = RC_REPLBUFF,
723 .pc_xdrressize = ST+FH+AT,
724 },
725 [NFSPROC_RMDIR] = {
726 .pc_func = nfsd_proc_rmdir,
727 .pc_decode = nfssvc_decode_diropargs,
728 .pc_encode = nfssvc_encode_void,
729 .pc_argsize = sizeof(struct nfsd_diropargs),
730 .pc_ressize = sizeof(struct nfsd_void),
731 .pc_cachetype = RC_REPLSTAT,
732 .pc_xdrressize = ST,
733 },
734 [NFSPROC_READDIR] = {
735 .pc_func = nfsd_proc_readdir,
736 .pc_decode = nfssvc_decode_readdirargs,
737 .pc_encode = nfssvc_encode_readdirres,
738 .pc_argsize = sizeof(struct nfsd_readdirargs),
739 .pc_ressize = sizeof(struct nfsd_readdirres),
740 .pc_cachetype = RC_NOCACHE,
741 },
742 [NFSPROC_STATFS] = {
743 .pc_func = nfsd_proc_statfs,
744 .pc_decode = nfssvc_decode_fhandle,
745 .pc_encode = nfssvc_encode_statfsres,
746 .pc_argsize = sizeof(struct nfsd_fhandle),
747 .pc_ressize = sizeof(struct nfsd_statfsres),
748 .pc_cachetype = RC_NOCACHE,
749 .pc_xdrressize = ST+5,
750 },
751};
752
753
754static unsigned int nfsd_count2[ARRAY_SIZE(nfsd_procedures2)];
755const struct svc_version nfsd_version2 = {
756 .vs_vers = 2,
757 .vs_nproc = 18,
758 .vs_proc = nfsd_procedures2,
759 .vs_count = nfsd_count2,
760 .vs_dispatch = nfsd_dispatch,
761 .vs_xdrsize = NFS2_SVC_XDRSIZE,
762};
763
764/*
765 * Map errnos to NFS errnos.
766 */
767__be32
768nfserrno (int errno)
769{
770 static struct {
771 __be32 nfserr;
772 int syserr;
773 } nfs_errtbl[] = {
774 { nfs_ok, 0 },
775 { nfserr_perm, -EPERM },
776 { nfserr_noent, -ENOENT },
777 { nfserr_io, -EIO },
778 { nfserr_nxio, -ENXIO },
779 { nfserr_fbig, -E2BIG },
780 { nfserr_acces, -EACCES },
781 { nfserr_exist, -EEXIST },
782 { nfserr_xdev, -EXDEV },
783 { nfserr_mlink, -EMLINK },
784 { nfserr_nodev, -ENODEV },
785 { nfserr_notdir, -ENOTDIR },
786 { nfserr_isdir, -EISDIR },
787 { nfserr_inval, -EINVAL },
788 { nfserr_fbig, -EFBIG },
789 { nfserr_nospc, -ENOSPC },
790 { nfserr_rofs, -EROFS },
791 { nfserr_mlink, -EMLINK },
792 { nfserr_nametoolong, -ENAMETOOLONG },
793 { nfserr_notempty, -ENOTEMPTY },
794#ifdef EDQUOT
795 { nfserr_dquot, -EDQUOT },
796#endif
797 { nfserr_stale, -ESTALE },
798 { nfserr_jukebox, -ETIMEDOUT },
799 { nfserr_jukebox, -ERESTARTSYS },
800 { nfserr_jukebox, -EAGAIN },
801 { nfserr_jukebox, -EWOULDBLOCK },
802 { nfserr_jukebox, -ENOMEM },
803 { nfserr_io, -ETXTBSY },
804 { nfserr_notsupp, -EOPNOTSUPP },
805 { nfserr_toosmall, -ETOOSMALL },
806 { nfserr_serverfault, -ESERVERFAULT },
807 { nfserr_serverfault, -ENFILE },
808 { nfserr_io, -EUCLEAN },
809 { nfserr_perm, -ENOKEY },
810 };
811 int i;
812
813 for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
814 if (nfs_errtbl[i].syserr == errno)
815 return nfs_errtbl[i].nfserr;
816 }
817 WARN_ONCE(1, "nfsd: non-standard errno: %d\n", errno);
818 return nfserr_io;
819}
820