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