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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
14#define NFSDDBG_FACILITY NFSDDBG_PROC
15
16static __be32
17nfsd_proc_null(struct svc_rqst *rqstp)
18{
19 return rpc_success;
20}
21
22/*
23 * Get a file's attributes
24 * N.B. After this call resp->fh needs an fh_put
25 */
26static __be32
27nfsd_proc_getattr(struct svc_rqst *rqstp)
28{
29 struct nfsd_fhandle *argp = rqstp->rq_argp;
30 struct nfsd_attrstat *resp = rqstp->rq_resp;
31
32 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
33
34 fh_copy(&resp->fh, &argp->fh);
35 resp->status = fh_verify(rqstp, &resp->fh, 0,
36 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
37 if (resp->status != nfs_ok)
38 goto out;
39 resp->status = fh_getattr(&resp->fh, &resp->stat);
40out:
41 return rpc_success;
42}
43
44/*
45 * Set a file's attributes
46 * N.B. After this call resp->fh needs an fh_put
47 */
48static __be32
49nfsd_proc_setattr(struct svc_rqst *rqstp)
50{
51 struct nfsd_sattrargs *argp = rqstp->rq_argp;
52 struct nfsd_attrstat *resp = rqstp->rq_resp;
53 struct iattr *iap = &argp->attrs;
54 struct svc_fh *fhp;
55
56 dprintk("nfsd: SETATTR %s, valid=%x, size=%ld\n",
57 SVCFH_fmt(&argp->fh),
58 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
59
60 fhp = fh_copy(&resp->fh, &argp->fh);
61
62 /*
63 * NFSv2 does not differentiate between "set-[ac]time-to-now"
64 * which only requires access, and "set-[ac]time-to-X" which
65 * requires ownership.
66 * So if it looks like it might be "set both to the same time which
67 * is close to now", and if setattr_prepare fails, then we
68 * convert to "set to now" instead of "set to explicit time"
69 *
70 * We only call setattr_prepare as the last test as technically
71 * it is not an interface that we should be using.
72 */
73#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
74#define MAX_TOUCH_TIME_ERROR (30*60)
75 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
76 iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
77 /*
78 * Looks probable.
79 *
80 * Now just make sure time is in the right ballpark.
81 * Solaris, at least, doesn't seem to care what the time
82 * request is. We require it be within 30 minutes of now.
83 */
84 time64_t delta = iap->ia_atime.tv_sec - ktime_get_real_seconds();
85
86 resp->status = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
87 if (resp->status != nfs_ok)
88 goto out;
89
90 if (delta < 0)
91 delta = -delta;
92 if (delta < MAX_TOUCH_TIME_ERROR &&
93 setattr_prepare(&init_user_ns, fhp->fh_dentry, iap) != 0) {
94 /*
95 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
96 * This will cause notify_change to set these times
97 * to "now"
98 */
99 iap->ia_valid &= ~BOTH_TIME_SET;
100 }
101 }
102
103 resp->status = nfsd_setattr(rqstp, fhp, iap, 0, (time64_t)0);
104 if (resp->status != nfs_ok)
105 goto out;
106
107 resp->status = fh_getattr(&resp->fh, &resp->stat);
108out:
109 return rpc_success;
110}
111
112/* Obsolete, replaced by MNTPROC_MNT. */
113static __be32
114nfsd_proc_root(struct svc_rqst *rqstp)
115{
116 return rpc_success;
117}
118
119/*
120 * Look up a path name component
121 * Note: the dentry in the resp->fh may be negative if the file
122 * doesn't exist yet.
123 * N.B. After this call resp->fh needs an fh_put
124 */
125static __be32
126nfsd_proc_lookup(struct svc_rqst *rqstp)
127{
128 struct nfsd_diropargs *argp = rqstp->rq_argp;
129 struct nfsd_diropres *resp = rqstp->rq_resp;
130
131 dprintk("nfsd: LOOKUP %s %.*s\n",
132 SVCFH_fmt(&argp->fh), argp->len, argp->name);
133
134 fh_init(&resp->fh, NFS_FHSIZE);
135 resp->status = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
136 &resp->fh);
137 fh_put(&argp->fh);
138 if (resp->status != nfs_ok)
139 goto out;
140
141 resp->status = fh_getattr(&resp->fh, &resp->stat);
142out:
143 return rpc_success;
144}
145
146/*
147 * Read a symlink.
148 */
149static __be32
150nfsd_proc_readlink(struct svc_rqst *rqstp)
151{
152 struct nfsd_fhandle *argp = rqstp->rq_argp;
153 struct nfsd_readlinkres *resp = rqstp->rq_resp;
154
155 dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
156
157 /* Read the symlink. */
158 resp->len = NFS_MAXPATHLEN;
159 resp->page = *(rqstp->rq_next_page++);
160 resp->status = nfsd_readlink(rqstp, &argp->fh,
161 page_address(resp->page), &resp->len);
162
163 fh_put(&argp->fh);
164 return rpc_success;
165}
166
167/*
168 * Read a portion of a file.
169 * N.B. After this call resp->fh needs an fh_put
170 */
171static __be32
172nfsd_proc_read(struct svc_rqst *rqstp)
173{
174 struct nfsd_readargs *argp = rqstp->rq_argp;
175 struct nfsd_readres *resp = rqstp->rq_resp;
176 unsigned int len;
177 u32 eof;
178 int v;
179
180 dprintk("nfsd: READ %s %d bytes at %d\n",
181 SVCFH_fmt(&argp->fh),
182 argp->count, argp->offset);
183
184 argp->count = min_t(u32, argp->count, NFSSVC_MAXBLKSIZE_V2);
185
186 v = 0;
187 len = argp->count;
188 resp->pages = rqstp->rq_next_page;
189 while (len > 0) {
190 struct page *page = *(rqstp->rq_next_page++);
191
192 rqstp->rq_vec[v].iov_base = page_address(page);
193 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
194 len -= rqstp->rq_vec[v].iov_len;
195 v++;
196 }
197
198 /* Obtain buffer pointer for payload. 19 is 1 word for
199 * status, 17 words for fattr, and 1 word for the byte count.
200 */
201 svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
202
203 resp->count = argp->count;
204 fh_copy(&resp->fh, &argp->fh);
205 resp->status = nfsd_read(rqstp, &resp->fh, argp->offset,
206 rqstp->rq_vec, v, &resp->count, &eof);
207 if (resp->status == nfs_ok)
208 resp->status = fh_getattr(&resp->fh, &resp->stat);
209 else if (resp->status == nfserr_jukebox)
210 return rpc_drop_reply;
211 return rpc_success;
212}
213
214/* Reserved */
215static __be32
216nfsd_proc_writecache(struct svc_rqst *rqstp)
217{
218 return rpc_success;
219}
220
221/*
222 * Write data to a file
223 * N.B. After this call resp->fh needs an fh_put
224 */
225static __be32
226nfsd_proc_write(struct svc_rqst *rqstp)
227{
228 struct nfsd_writeargs *argp = rqstp->rq_argp;
229 struct nfsd_attrstat *resp = rqstp->rq_resp;
230 unsigned long cnt = argp->len;
231 unsigned int nvecs;
232
233 dprintk("nfsd: WRITE %s %d bytes at %d\n",
234 SVCFH_fmt(&argp->fh),
235 argp->len, argp->offset);
236
237 nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
238 &argp->first, cnt);
239 if (!nvecs) {
240 resp->status = nfserr_io;
241 goto out;
242 }
243
244 resp->status = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh),
245 argp->offset, rqstp->rq_vec, nvecs,
246 &cnt, NFS_DATA_SYNC, NULL);
247 if (resp->status == nfs_ok)
248 resp->status = fh_getattr(&resp->fh, &resp->stat);
249 else if (resp->status == nfserr_jukebox)
250 return rpc_drop_reply;
251out:
252 return rpc_success;
253}
254
255/*
256 * CREATE processing is complicated. The keyword here is `overloaded.'
257 * The parent directory is kept locked between the check for existence
258 * and the actual create() call in compliance with VFS protocols.
259 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
260 */
261static __be32
262nfsd_proc_create(struct svc_rqst *rqstp)
263{
264 struct nfsd_createargs *argp = rqstp->rq_argp;
265 struct nfsd_diropres *resp = rqstp->rq_resp;
266 svc_fh *dirfhp = &argp->fh;
267 svc_fh *newfhp = &resp->fh;
268 struct iattr *attr = &argp->attrs;
269 struct inode *inode;
270 struct dentry *dchild;
271 int type, mode;
272 int hosterr;
273 dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size);
274
275 dprintk("nfsd: CREATE %s %.*s\n",
276 SVCFH_fmt(dirfhp), argp->len, argp->name);
277
278 /* First verify the parent file handle */
279 resp->status = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
280 if (resp->status != nfs_ok)
281 goto done; /* must fh_put dirfhp even on error */
282
283 /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
284
285 resp->status = nfserr_exist;
286 if (isdotent(argp->name, argp->len))
287 goto done;
288 hosterr = fh_want_write(dirfhp);
289 if (hosterr) {
290 resp->status = nfserrno(hosterr);
291 goto done;
292 }
293
294 fh_lock_nested(dirfhp, I_MUTEX_PARENT);
295 dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
296 if (IS_ERR(dchild)) {
297 resp->status = nfserrno(PTR_ERR(dchild));
298 goto out_unlock;
299 }
300 fh_init(newfhp, NFS_FHSIZE);
301 resp->status = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
302 if (!resp->status && d_really_is_negative(dchild))
303 resp->status = nfserr_noent;
304 dput(dchild);
305 if (resp->status) {
306 if (resp->status != nfserr_noent)
307 goto out_unlock;
308 /*
309 * If the new file handle wasn't verified, we can't tell
310 * whether the file exists or not. Time to bail ...
311 */
312 resp->status = nfserr_acces;
313 if (!newfhp->fh_dentry) {
314 printk(KERN_WARNING
315 "nfsd_proc_create: file handle not verified\n");
316 goto out_unlock;
317 }
318 }
319
320 inode = d_inode(newfhp->fh_dentry);
321
322 /* Unfudge the mode bits */
323 if (attr->ia_valid & ATTR_MODE) {
324 type = attr->ia_mode & S_IFMT;
325 mode = attr->ia_mode & ~S_IFMT;
326 if (!type) {
327 /* no type, so if target exists, assume same as that,
328 * else assume a file */
329 if (inode) {
330 type = inode->i_mode & S_IFMT;
331 switch(type) {
332 case S_IFCHR:
333 case S_IFBLK:
334 /* reserve rdev for later checking */
335 rdev = inode->i_rdev;
336 attr->ia_valid |= ATTR_SIZE;
337
338 fallthrough;
339 case S_IFIFO:
340 /* this is probably a permission check..
341 * at least IRIX implements perm checking on
342 * echo thing > device-special-file-or-pipe
343 * by doing a CREATE with type==0
344 */
345 resp->status = nfsd_permission(rqstp,
346 newfhp->fh_export,
347 newfhp->fh_dentry,
348 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
349 if (resp->status && resp->status != nfserr_rofs)
350 goto out_unlock;
351 }
352 } else
353 type = S_IFREG;
354 }
355 } else if (inode) {
356 type = inode->i_mode & S_IFMT;
357 mode = inode->i_mode & ~S_IFMT;
358 } else {
359 type = S_IFREG;
360 mode = 0; /* ??? */
361 }
362
363 attr->ia_valid |= ATTR_MODE;
364 attr->ia_mode = mode;
365
366 /* Special treatment for non-regular files according to the
367 * gospel of sun micro
368 */
369 if (type != S_IFREG) {
370 if (type != S_IFBLK && type != S_IFCHR) {
371 rdev = 0;
372 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
373 /* If you think you've seen the worst, grok this. */
374 type = S_IFIFO;
375 } else {
376 /* Okay, char or block special */
377 if (!rdev)
378 rdev = wanted;
379 }
380
381 /* we've used the SIZE information, so discard it */
382 attr->ia_valid &= ~ATTR_SIZE;
383
384 /* Make sure the type and device matches */
385 resp->status = nfserr_exist;
386 if (inode && inode_wrong_type(inode, type))
387 goto out_unlock;
388 }
389
390 resp->status = nfs_ok;
391 if (!inode) {
392 /* File doesn't exist. Create it and set attrs */
393 resp->status = nfsd_create_locked(rqstp, dirfhp, argp->name,
394 argp->len, attr, type, rdev,
395 newfhp);
396 } else if (type == S_IFREG) {
397 dprintk("nfsd: existing %s, valid=%x, size=%ld\n",
398 argp->name, attr->ia_valid, (long) attr->ia_size);
399 /* File already exists. We ignore all attributes except
400 * size, so that creat() behaves exactly like
401 * open(..., O_CREAT|O_TRUNC|O_WRONLY).
402 */
403 attr->ia_valid &= ATTR_SIZE;
404 if (attr->ia_valid)
405 resp->status = nfsd_setattr(rqstp, newfhp, attr, 0,
406 (time64_t)0);
407 }
408
409out_unlock:
410 /* We don't really need to unlock, as fh_put does it. */
411 fh_unlock(dirfhp);
412 fh_drop_write(dirfhp);
413done:
414 fh_put(dirfhp);
415 if (resp->status != nfs_ok)
416 goto out;
417 resp->status = fh_getattr(&resp->fh, &resp->stat);
418out:
419 return rpc_success;
420}
421
422static __be32
423nfsd_proc_remove(struct svc_rqst *rqstp)
424{
425 struct nfsd_diropargs *argp = rqstp->rq_argp;
426 struct nfsd_stat *resp = rqstp->rq_resp;
427
428 dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh),
429 argp->len, argp->name);
430
431 /* Unlink. -SIFDIR means file must not be a directory */
432 resp->status = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR,
433 argp->name, argp->len);
434 fh_put(&argp->fh);
435 return rpc_success;
436}
437
438static __be32
439nfsd_proc_rename(struct svc_rqst *rqstp)
440{
441 struct nfsd_renameargs *argp = rqstp->rq_argp;
442 struct nfsd_stat *resp = rqstp->rq_resp;
443
444 dprintk("nfsd: RENAME %s %.*s -> \n",
445 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
446 dprintk("nfsd: -> %s %.*s\n",
447 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
448
449 resp->status = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
450 &argp->tfh, argp->tname, argp->tlen);
451 fh_put(&argp->ffh);
452 fh_put(&argp->tfh);
453 return rpc_success;
454}
455
456static __be32
457nfsd_proc_link(struct svc_rqst *rqstp)
458{
459 struct nfsd_linkargs *argp = rqstp->rq_argp;
460 struct nfsd_stat *resp = rqstp->rq_resp;
461
462 dprintk("nfsd: LINK %s ->\n",
463 SVCFH_fmt(&argp->ffh));
464 dprintk("nfsd: %s %.*s\n",
465 SVCFH_fmt(&argp->tfh),
466 argp->tlen,
467 argp->tname);
468
469 resp->status = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
470 &argp->ffh);
471 fh_put(&argp->ffh);
472 fh_put(&argp->tfh);
473 return rpc_success;
474}
475
476static __be32
477nfsd_proc_symlink(struct svc_rqst *rqstp)
478{
479 struct nfsd_symlinkargs *argp = rqstp->rq_argp;
480 struct nfsd_stat *resp = rqstp->rq_resp;
481 struct svc_fh newfh;
482
483 if (argp->tlen > NFS_MAXPATHLEN) {
484 resp->status = nfserr_nametoolong;
485 goto out;
486 }
487
488 argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
489 page_address(rqstp->rq_arg.pages[0]),
490 argp->tlen);
491 if (IS_ERR(argp->tname)) {
492 resp->status = nfserrno(PTR_ERR(argp->tname));
493 goto out;
494 }
495
496 dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n",
497 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
498 argp->tlen, argp->tname);
499
500 fh_init(&newfh, NFS_FHSIZE);
501 resp->status = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
502 argp->tname, &newfh);
503
504 kfree(argp->tname);
505 fh_put(&argp->ffh);
506 fh_put(&newfh);
507out:
508 return rpc_success;
509}
510
511/*
512 * Make directory. This operation is not idempotent.
513 * N.B. After this call resp->fh needs an fh_put
514 */
515static __be32
516nfsd_proc_mkdir(struct svc_rqst *rqstp)
517{
518 struct nfsd_createargs *argp = rqstp->rq_argp;
519 struct nfsd_diropres *resp = rqstp->rq_resp;
520
521 dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
522
523 if (resp->fh.fh_dentry) {
524 printk(KERN_WARNING
525 "nfsd_proc_mkdir: response already verified??\n");
526 }
527
528 argp->attrs.ia_valid &= ~ATTR_SIZE;
529 fh_init(&resp->fh, NFS_FHSIZE);
530 resp->status = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
531 &argp->attrs, S_IFDIR, 0, &resp->fh);
532 fh_put(&argp->fh);
533 if (resp->status != nfs_ok)
534 goto out;
535
536 resp->status = fh_getattr(&resp->fh, &resp->stat);
537out:
538 return rpc_success;
539}
540
541/*
542 * Remove a directory
543 */
544static __be32
545nfsd_proc_rmdir(struct svc_rqst *rqstp)
546{
547 struct nfsd_diropargs *argp = rqstp->rq_argp;
548 struct nfsd_stat *resp = rqstp->rq_resp;
549
550 dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
551
552 resp->status = nfsd_unlink(rqstp, &argp->fh, S_IFDIR,
553 argp->name, argp->len);
554 fh_put(&argp->fh);
555 return rpc_success;
556}
557
558static void nfsd_init_dirlist_pages(struct svc_rqst *rqstp,
559 struct nfsd_readdirres *resp,
560 int count)
561{
562 struct xdr_buf *buf = &resp->dirlist;
563 struct xdr_stream *xdr = &resp->xdr;
564
565 count = min_t(u32, count, PAGE_SIZE);
566
567 memset(buf, 0, sizeof(*buf));
568
569 /* Reserve room for the NULL ptr & eof flag (-2 words) */
570 buf->buflen = count - sizeof(__be32) * 2;
571 buf->pages = rqstp->rq_next_page;
572 rqstp->rq_next_page++;
573
574 /* This is xdr_init_encode(), but it assumes that
575 * the head kvec has already been consumed. */
576 xdr_set_scratch_buffer(xdr, NULL, 0);
577 xdr->buf = buf;
578 xdr->page_ptr = buf->pages;
579 xdr->iov = NULL;
580 xdr->p = page_address(*buf->pages);
581 xdr->end = xdr->p + (PAGE_SIZE >> 2);
582 xdr->rqst = NULL;
583}
584
585/*
586 * Read a portion of a directory.
587 */
588static __be32
589nfsd_proc_readdir(struct svc_rqst *rqstp)
590{
591 struct nfsd_readdirargs *argp = rqstp->rq_argp;
592 struct nfsd_readdirres *resp = rqstp->rq_resp;
593 loff_t offset;
594
595 dprintk("nfsd: READDIR %s %d bytes at %d\n",
596 SVCFH_fmt(&argp->fh),
597 argp->count, argp->cookie);
598
599 nfsd_init_dirlist_pages(rqstp, resp, argp->count);
600
601 resp->common.err = nfs_ok;
602 resp->cookie_offset = 0;
603 offset = argp->cookie;
604 resp->status = nfsd_readdir(rqstp, &argp->fh, &offset,
605 &resp->common, nfssvc_encode_entry);
606 nfssvc_encode_nfscookie(resp, offset);
607
608 fh_put(&argp->fh);
609 return rpc_success;
610}
611
612/*
613 * Get file system info
614 */
615static __be32
616nfsd_proc_statfs(struct svc_rqst *rqstp)
617{
618 struct nfsd_fhandle *argp = rqstp->rq_argp;
619 struct nfsd_statfsres *resp = rqstp->rq_resp;
620
621 dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh));
622
623 resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
624 NFSD_MAY_BYPASS_GSS_ON_ROOT);
625 fh_put(&argp->fh);
626 return rpc_success;
627}
628
629/*
630 * NFSv2 Server procedures.
631 * Only the results of non-idempotent operations are cached.
632 */
633
634#define ST 1 /* status */
635#define FH 8 /* filehandle */
636#define AT 18 /* attributes */
637
638static const struct svc_procedure nfsd_procedures2[18] = {
639 [NFSPROC_NULL] = {
640 .pc_func = nfsd_proc_null,
641 .pc_decode = nfssvc_decode_voidarg,
642 .pc_encode = nfssvc_encode_voidres,
643 .pc_argsize = sizeof(struct nfsd_voidargs),
644 .pc_ressize = sizeof(struct nfsd_voidres),
645 .pc_cachetype = RC_NOCACHE,
646 .pc_xdrressize = 0,
647 .pc_name = "NULL",
648 },
649 [NFSPROC_GETATTR] = {
650 .pc_func = nfsd_proc_getattr,
651 .pc_decode = nfssvc_decode_fhandleargs,
652 .pc_encode = nfssvc_encode_attrstatres,
653 .pc_release = nfssvc_release_attrstat,
654 .pc_argsize = sizeof(struct nfsd_fhandle),
655 .pc_ressize = sizeof(struct nfsd_attrstat),
656 .pc_cachetype = RC_NOCACHE,
657 .pc_xdrressize = ST+AT,
658 .pc_name = "GETATTR",
659 },
660 [NFSPROC_SETATTR] = {
661 .pc_func = nfsd_proc_setattr,
662 .pc_decode = nfssvc_decode_sattrargs,
663 .pc_encode = nfssvc_encode_attrstatres,
664 .pc_release = nfssvc_release_attrstat,
665 .pc_argsize = sizeof(struct nfsd_sattrargs),
666 .pc_ressize = sizeof(struct nfsd_attrstat),
667 .pc_cachetype = RC_REPLBUFF,
668 .pc_xdrressize = ST+AT,
669 .pc_name = "SETATTR",
670 },
671 [NFSPROC_ROOT] = {
672 .pc_func = nfsd_proc_root,
673 .pc_decode = nfssvc_decode_voidarg,
674 .pc_encode = nfssvc_encode_voidres,
675 .pc_argsize = sizeof(struct nfsd_voidargs),
676 .pc_ressize = sizeof(struct nfsd_voidres),
677 .pc_cachetype = RC_NOCACHE,
678 .pc_xdrressize = 0,
679 .pc_name = "ROOT",
680 },
681 [NFSPROC_LOOKUP] = {
682 .pc_func = nfsd_proc_lookup,
683 .pc_decode = nfssvc_decode_diropargs,
684 .pc_encode = nfssvc_encode_diropres,
685 .pc_release = nfssvc_release_diropres,
686 .pc_argsize = sizeof(struct nfsd_diropargs),
687 .pc_ressize = sizeof(struct nfsd_diropres),
688 .pc_cachetype = RC_NOCACHE,
689 .pc_xdrressize = ST+FH+AT,
690 .pc_name = "LOOKUP",
691 },
692 [NFSPROC_READLINK] = {
693 .pc_func = nfsd_proc_readlink,
694 .pc_decode = nfssvc_decode_fhandleargs,
695 .pc_encode = nfssvc_encode_readlinkres,
696 .pc_argsize = sizeof(struct nfsd_fhandle),
697 .pc_ressize = sizeof(struct nfsd_readlinkres),
698 .pc_cachetype = RC_NOCACHE,
699 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
700 .pc_name = "READLINK",
701 },
702 [NFSPROC_READ] = {
703 .pc_func = nfsd_proc_read,
704 .pc_decode = nfssvc_decode_readargs,
705 .pc_encode = nfssvc_encode_readres,
706 .pc_release = nfssvc_release_readres,
707 .pc_argsize = sizeof(struct nfsd_readargs),
708 .pc_ressize = sizeof(struct nfsd_readres),
709 .pc_cachetype = RC_NOCACHE,
710 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
711 .pc_name = "READ",
712 },
713 [NFSPROC_WRITECACHE] = {
714 .pc_func = nfsd_proc_writecache,
715 .pc_decode = nfssvc_decode_voidarg,
716 .pc_encode = nfssvc_encode_voidres,
717 .pc_argsize = sizeof(struct nfsd_voidargs),
718 .pc_ressize = sizeof(struct nfsd_voidres),
719 .pc_cachetype = RC_NOCACHE,
720 .pc_xdrressize = 0,
721 .pc_name = "WRITECACHE",
722 },
723 [NFSPROC_WRITE] = {
724 .pc_func = nfsd_proc_write,
725 .pc_decode = nfssvc_decode_writeargs,
726 .pc_encode = nfssvc_encode_attrstatres,
727 .pc_release = nfssvc_release_attrstat,
728 .pc_argsize = sizeof(struct nfsd_writeargs),
729 .pc_ressize = sizeof(struct nfsd_attrstat),
730 .pc_cachetype = RC_REPLBUFF,
731 .pc_xdrressize = ST+AT,
732 .pc_name = "WRITE",
733 },
734 [NFSPROC_CREATE] = {
735 .pc_func = nfsd_proc_create,
736 .pc_decode = nfssvc_decode_createargs,
737 .pc_encode = nfssvc_encode_diropres,
738 .pc_release = nfssvc_release_diropres,
739 .pc_argsize = sizeof(struct nfsd_createargs),
740 .pc_ressize = sizeof(struct nfsd_diropres),
741 .pc_cachetype = RC_REPLBUFF,
742 .pc_xdrressize = ST+FH+AT,
743 .pc_name = "CREATE",
744 },
745 [NFSPROC_REMOVE] = {
746 .pc_func = nfsd_proc_remove,
747 .pc_decode = nfssvc_decode_diropargs,
748 .pc_encode = nfssvc_encode_statres,
749 .pc_argsize = sizeof(struct nfsd_diropargs),
750 .pc_ressize = sizeof(struct nfsd_stat),
751 .pc_cachetype = RC_REPLSTAT,
752 .pc_xdrressize = ST,
753 .pc_name = "REMOVE",
754 },
755 [NFSPROC_RENAME] = {
756 .pc_func = nfsd_proc_rename,
757 .pc_decode = nfssvc_decode_renameargs,
758 .pc_encode = nfssvc_encode_statres,
759 .pc_argsize = sizeof(struct nfsd_renameargs),
760 .pc_ressize = sizeof(struct nfsd_stat),
761 .pc_cachetype = RC_REPLSTAT,
762 .pc_xdrressize = ST,
763 .pc_name = "RENAME",
764 },
765 [NFSPROC_LINK] = {
766 .pc_func = nfsd_proc_link,
767 .pc_decode = nfssvc_decode_linkargs,
768 .pc_encode = nfssvc_encode_statres,
769 .pc_argsize = sizeof(struct nfsd_linkargs),
770 .pc_ressize = sizeof(struct nfsd_stat),
771 .pc_cachetype = RC_REPLSTAT,
772 .pc_xdrressize = ST,
773 .pc_name = "LINK",
774 },
775 [NFSPROC_SYMLINK] = {
776 .pc_func = nfsd_proc_symlink,
777 .pc_decode = nfssvc_decode_symlinkargs,
778 .pc_encode = nfssvc_encode_statres,
779 .pc_argsize = sizeof(struct nfsd_symlinkargs),
780 .pc_ressize = sizeof(struct nfsd_stat),
781 .pc_cachetype = RC_REPLSTAT,
782 .pc_xdrressize = ST,
783 .pc_name = "SYMLINK",
784 },
785 [NFSPROC_MKDIR] = {
786 .pc_func = nfsd_proc_mkdir,
787 .pc_decode = nfssvc_decode_createargs,
788 .pc_encode = nfssvc_encode_diropres,
789 .pc_release = nfssvc_release_diropres,
790 .pc_argsize = sizeof(struct nfsd_createargs),
791 .pc_ressize = sizeof(struct nfsd_diropres),
792 .pc_cachetype = RC_REPLBUFF,
793 .pc_xdrressize = ST+FH+AT,
794 .pc_name = "MKDIR",
795 },
796 [NFSPROC_RMDIR] = {
797 .pc_func = nfsd_proc_rmdir,
798 .pc_decode = nfssvc_decode_diropargs,
799 .pc_encode = nfssvc_encode_statres,
800 .pc_argsize = sizeof(struct nfsd_diropargs),
801 .pc_ressize = sizeof(struct nfsd_stat),
802 .pc_cachetype = RC_REPLSTAT,
803 .pc_xdrressize = ST,
804 .pc_name = "RMDIR",
805 },
806 [NFSPROC_READDIR] = {
807 .pc_func = nfsd_proc_readdir,
808 .pc_decode = nfssvc_decode_readdirargs,
809 .pc_encode = nfssvc_encode_readdirres,
810 .pc_argsize = sizeof(struct nfsd_readdirargs),
811 .pc_ressize = sizeof(struct nfsd_readdirres),
812 .pc_cachetype = RC_NOCACHE,
813 .pc_name = "READDIR",
814 },
815 [NFSPROC_STATFS] = {
816 .pc_func = nfsd_proc_statfs,
817 .pc_decode = nfssvc_decode_fhandleargs,
818 .pc_encode = nfssvc_encode_statfsres,
819 .pc_argsize = sizeof(struct nfsd_fhandle),
820 .pc_ressize = sizeof(struct nfsd_statfsres),
821 .pc_cachetype = RC_NOCACHE,
822 .pc_xdrressize = ST+5,
823 .pc_name = "STATFS",
824 },
825};
826
827
828static unsigned int nfsd_count2[ARRAY_SIZE(nfsd_procedures2)];
829const struct svc_version nfsd_version2 = {
830 .vs_vers = 2,
831 .vs_nproc = 18,
832 .vs_proc = nfsd_procedures2,
833 .vs_count = nfsd_count2,
834 .vs_dispatch = nfsd_dispatch,
835 .vs_xdrsize = NFS2_SVC_XDRSIZE,
836};
837
838/*
839 * Map errnos to NFS errnos.
840 */
841__be32
842nfserrno (int errno)
843{
844 static struct {
845 __be32 nfserr;
846 int syserr;
847 } nfs_errtbl[] = {
848 { nfs_ok, 0 },
849 { nfserr_perm, -EPERM },
850 { nfserr_noent, -ENOENT },
851 { nfserr_io, -EIO },
852 { nfserr_nxio, -ENXIO },
853 { nfserr_fbig, -E2BIG },
854 { nfserr_acces, -EACCES },
855 { nfserr_exist, -EEXIST },
856 { nfserr_xdev, -EXDEV },
857 { nfserr_mlink, -EMLINK },
858 { nfserr_nodev, -ENODEV },
859 { nfserr_notdir, -ENOTDIR },
860 { nfserr_isdir, -EISDIR },
861 { nfserr_inval, -EINVAL },
862 { nfserr_fbig, -EFBIG },
863 { nfserr_nospc, -ENOSPC },
864 { nfserr_rofs, -EROFS },
865 { nfserr_mlink, -EMLINK },
866 { nfserr_nametoolong, -ENAMETOOLONG },
867 { nfserr_notempty, -ENOTEMPTY },
868#ifdef EDQUOT
869 { nfserr_dquot, -EDQUOT },
870#endif
871 { nfserr_stale, -ESTALE },
872 { nfserr_jukebox, -ETIMEDOUT },
873 { nfserr_jukebox, -ERESTARTSYS },
874 { nfserr_jukebox, -EAGAIN },
875 { nfserr_jukebox, -EWOULDBLOCK },
876 { nfserr_jukebox, -ENOMEM },
877 { nfserr_io, -ETXTBSY },
878 { nfserr_notsupp, -EOPNOTSUPP },
879 { nfserr_toosmall, -ETOOSMALL },
880 { nfserr_serverfault, -ESERVERFAULT },
881 { nfserr_serverfault, -ENFILE },
882 { nfserr_io, -EUCLEAN },
883 { nfserr_perm, -ENOKEY },
884 };
885 int i;
886
887 for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
888 if (nfs_errtbl[i].syserr == errno)
889 return nfs_errtbl[i].nfserr;
890 }
891 WARN_ONCE(1, "nfsd: non-standard errno: %d\n", errno);
892 return nfserr_io;
893}
894