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Linux 6.14-rc1
[linux.git] / fs / nfsd / nfs3proc.c
blob372bdcf5e07a5c835da240ecebb02e3576eb2ca6
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Process version 3 NFS requests.
4 *
5 * Copyright (C) 1996, 1997, 1998 Olaf Kirch <okir@monad.swb.de>
6 */
7
8 #include <linux/fs.h>
9 #include <linux/ext2_fs.h>
10 #include <linux/magic.h>
11 #include <linux/namei.h>
12
13 #include "cache.h"
14 #include "xdr3.h"
15 #include "vfs.h"
16 #include "filecache.h"
17
18 #define NFSDDBG_FACILITY NFSDDBG_PROC
19
20 static int nfs3_ftypes[] = {
21 0, /* NF3NON */
22 S_IFREG, /* NF3REG */
23 S_IFDIR, /* NF3DIR */
24 S_IFBLK, /* NF3BLK */
25 S_IFCHR, /* NF3CHR */
26 S_IFLNK, /* NF3LNK */
27 S_IFSOCK, /* NF3SOCK */
28 S_IFIFO, /* NF3FIFO */
29 };
30
31 static __be32 nfsd3_map_status(__be32 status)
32 {
33 switch (status) {
34 case nfs_ok:
35 break;
36 case nfserr_nofilehandle:
37 status = nfserr_badhandle;
38 break;
39 case nfserr_wrongsec:
40 case nfserr_file_open:
41 status = nfserr_acces;
42 break;
43 case nfserr_symlink_not_dir:
44 status = nfserr_notdir;
45 break;
46 case nfserr_symlink:
47 case nfserr_wrong_type:
48 status = nfserr_inval;
49 break;
50 }
51 return status;
52 }
53
54 /*
55 * NULL call.
56 */
57 static __be32
58 nfsd3_proc_null(struct svc_rqst *rqstp)
59 {
60 return rpc_success;
61 }
62
63 /*
64 * Get a file's attributes
65 */
66 static __be32
67 nfsd3_proc_getattr(struct svc_rqst *rqstp)
68 {
69 struct nfsd_fhandle *argp = rqstp->rq_argp;
70 struct nfsd3_attrstat *resp = rqstp->rq_resp;
71
72 dprintk("nfsd: GETATTR(3) %s\n",
73 SVCFH_fmt(&argp->fh));
74
75 fh_copy(&resp->fh, &argp->fh);
76 resp->status = fh_verify(rqstp, &resp->fh, 0,
77 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
78 if (resp->status != nfs_ok)
79 goto out;
80
81 resp->status = fh_getattr(&resp->fh, &resp->stat);
82 out:
83 resp->status = nfsd3_map_status(resp->status);
84 return rpc_success;
85 }
86
87 /*
88 * Set a file's attributes
89 */
90 static __be32
91 nfsd3_proc_setattr(struct svc_rqst *rqstp)
92 {
93 struct nfsd3_sattrargs *argp = rqstp->rq_argp;
94 struct nfsd3_attrstat *resp = rqstp->rq_resp;
95 struct nfsd_attrs attrs = {
96 .na_iattr = &argp->attrs,
97 };
98 const struct timespec64 *guardtime = NULL;
99
100 dprintk("nfsd: SETATTR(3) %s\n",
101 SVCFH_fmt(&argp->fh));
102
103 fh_copy(&resp->fh, &argp->fh);
104 if (argp->check_guard)
105 guardtime = &argp->guardtime;
106 resp->status = nfsd_setattr(rqstp, &resp->fh, &attrs, guardtime);
107 resp->status = nfsd3_map_status(resp->status);
108 return rpc_success;
109 }
110
111 /*
112 * Look up a path name component
113 */
114 static __be32
115 nfsd3_proc_lookup(struct svc_rqst *rqstp)
116 {
117 struct nfsd3_diropargs *argp = rqstp->rq_argp;
118 struct nfsd3_diropres *resp = rqstp->rq_resp;
119
120 dprintk("nfsd: LOOKUP(3) %s %.*s\n",
121 SVCFH_fmt(&argp->fh),
122 argp->len,
123 argp->name);
124
125 fh_copy(&resp->dirfh, &argp->fh);
126 fh_init(&resp->fh, NFS3_FHSIZE);
127
128 resp->status = nfsd_lookup(rqstp, &resp->dirfh,
129 argp->name, argp->len,
130 &resp->fh);
131 resp->status = nfsd3_map_status(resp->status);
132 return rpc_success;
133 }
134
135 /*
136 * Check file access
137 */
138 static __be32
139 nfsd3_proc_access(struct svc_rqst *rqstp)
140 {
141 struct nfsd3_accessargs *argp = rqstp->rq_argp;
142 struct nfsd3_accessres *resp = rqstp->rq_resp;
143
144 dprintk("nfsd: ACCESS(3) %s 0x%x\n",
145 SVCFH_fmt(&argp->fh),
146 argp->access);
147
148 fh_copy(&resp->fh, &argp->fh);
149 resp->access = argp->access;
150 resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
151 resp->status = nfsd3_map_status(resp->status);
152 return rpc_success;
153 }
154
155 /*
156 * Read a symlink.
157 */
158 static __be32
159 nfsd3_proc_readlink(struct svc_rqst *rqstp)
160 {
161 struct nfsd_fhandle *argp = rqstp->rq_argp;
162 struct nfsd3_readlinkres *resp = rqstp->rq_resp;
163
164 dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));
165
166 /* Read the symlink. */
167 fh_copy(&resp->fh, &argp->fh);
168 resp->len = NFS3_MAXPATHLEN;
169 resp->pages = rqstp->rq_next_page++;
170 resp->status = nfsd_readlink(rqstp, &resp->fh,
171 page_address(*resp->pages), &resp->len);
172 resp->status = nfsd3_map_status(resp->status);
173 return rpc_success;
174 }
175
176 /*
177 * Read a portion of a file.
178 */
179 static __be32
180 nfsd3_proc_read(struct svc_rqst *rqstp)
181 {
182 struct nfsd3_readargs *argp = rqstp->rq_argp;
183 struct nfsd3_readres *resp = rqstp->rq_resp;
184
185 dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n",
186 SVCFH_fmt(&argp->fh),
187 (unsigned long) argp->count,
188 (unsigned long long) argp->offset);
189
190 argp->count = min_t(u32, argp->count, svc_max_payload(rqstp));
191 argp->count = min_t(u32, argp->count, rqstp->rq_res.buflen);
192 if (argp->offset > (u64)OFFSET_MAX)
193 argp->offset = (u64)OFFSET_MAX;
194 if (argp->offset + argp->count > (u64)OFFSET_MAX)
195 argp->count = (u64)OFFSET_MAX - argp->offset;
196
197 resp->pages = rqstp->rq_next_page;
198
199 /* Obtain buffer pointer for payload.
200 * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
201 * + 1 (xdr opaque byte count) = 26
202 */
203 resp->count = argp->count;
204 svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3) << 2) +
205 resp->count + 4);
206
207 fh_copy(&resp->fh, &argp->fh);
208 resp->status = nfsd_read(rqstp, &resp->fh, argp->offset,
209 &resp->count, &resp->eof);
210 resp->status = nfsd3_map_status(resp->status);
211 return rpc_success;
212 }
213
214 /*
215 * Write data to a file
216 */
217 static __be32
218 nfsd3_proc_write(struct svc_rqst *rqstp)
219 {
220 struct nfsd3_writeargs *argp = rqstp->rq_argp;
221 struct nfsd3_writeres *resp = rqstp->rq_resp;
222 unsigned long cnt = argp->len;
223 unsigned int nvecs;
224
225 dprintk("nfsd: WRITE(3) %s %d bytes at %Lu%s\n",
226 SVCFH_fmt(&argp->fh),
227 argp->len,
228 (unsigned long long) argp->offset,
229 argp->stable ? " stable" : "");
230
231 resp->status = nfserr_fbig;
232 if (argp->offset > (u64)OFFSET_MAX ||
233 argp->offset + argp->len > (u64)OFFSET_MAX)
234 return rpc_success;
235
236 fh_copy(&resp->fh, &argp->fh);
237 resp->committed = argp->stable;
238 nvecs = svc_fill_write_vector(rqstp, &argp->payload);
239
240 resp->status = nfsd_write(rqstp, &resp->fh, argp->offset,
241 rqstp->rq_vec, nvecs, &cnt,
242 resp->committed, resp->verf);
243 resp->count = cnt;
244 resp->status = nfsd3_map_status(resp->status);
245 return rpc_success;
246 }
247
248 /*
249 * Implement NFSv3's unchecked, guarded, and exclusive CREATE
250 * semantics for regular files. Except for the created file,
251 * this operation is stateless on the server.
252 *
253 * Upon return, caller must release @fhp and @resfhp.
254 */
255 static __be32
256 nfsd3_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
257 struct svc_fh *resfhp, struct nfsd3_createargs *argp)
258 {
259 struct iattr *iap = &argp->attrs;
260 struct dentry *parent, *child;
261 struct nfsd_attrs attrs = {
262 .na_iattr = iap,
263 };
264 __u32 v_mtime, v_atime;
265 struct inode *inode;
266 __be32 status;
267 int host_err;
268
269 if (isdotent(argp->name, argp->len))
270 return nfserr_exist;
271 if (!(iap->ia_valid & ATTR_MODE))
272 iap->ia_mode = 0;
273
274 status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
275 if (status != nfs_ok)
276 return status;
277
278 parent = fhp->fh_dentry;
279 inode = d_inode(parent);
280
281 host_err = fh_want_write(fhp);
282 if (host_err)
283 return nfserrno(host_err);
284
285 inode_lock_nested(inode, I_MUTEX_PARENT);
286
287 child = lookup_one_len(argp->name, parent, argp->len);
288 if (IS_ERR(child)) {
289 status = nfserrno(PTR_ERR(child));
290 goto out;
291 }
292
293 if (d_really_is_negative(child)) {
294 status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
295 if (status != nfs_ok)
296 goto out;
297 }
298
299 status = fh_compose(resfhp, fhp->fh_export, child, fhp);
300 if (status != nfs_ok)
301 goto out;
302
303 v_mtime = 0;
304 v_atime = 0;
305 if (argp->createmode == NFS3_CREATE_EXCLUSIVE) {
306 u32 *verifier = (u32 *)argp->verf;
307
308 /*
309 * Solaris 7 gets confused (bugid 4218508) if these have
310 * the high bit set, as do xfs filesystems without the
311 * "bigtime" feature. So just clear the high bits.
312 */
313 v_mtime = verifier[0] & 0x7fffffff;
314 v_atime = verifier[1] & 0x7fffffff;
315 }
316
317 if (d_really_is_positive(child)) {
318 status = nfs_ok;
319
320 switch (argp->createmode) {
321 case NFS3_CREATE_UNCHECKED:
322 if (!d_is_reg(child))
323 break;
324 iap->ia_valid &= ATTR_SIZE;
325 goto set_attr;
326 case NFS3_CREATE_GUARDED:
327 status = nfserr_exist;
328 break;
329 case NFS3_CREATE_EXCLUSIVE:
330 if (inode_get_mtime_sec(d_inode(child)) == v_mtime &&
331 inode_get_atime_sec(d_inode(child)) == v_atime &&
332 d_inode(child)->i_size == 0) {
333 break;
334 }
335 status = nfserr_exist;
336 }
337 goto out;
338 }
339
340 if (!IS_POSIXACL(inode))
341 iap->ia_mode &= ~current_umask();
342
343 status = fh_fill_pre_attrs(fhp);
344 if (status != nfs_ok)
345 goto out;
346 host_err = vfs_create(&nop_mnt_idmap, inode, child, iap->ia_mode, true);
347 if (host_err < 0) {
348 status = nfserrno(host_err);
349 goto out;
350 }
351 fh_fill_post_attrs(fhp);
352
353 /* A newly created file already has a file size of zero. */
354 if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
355 iap->ia_valid &= ~ATTR_SIZE;
356 if (argp->createmode == NFS3_CREATE_EXCLUSIVE) {
357 iap->ia_valid = ATTR_MTIME | ATTR_ATIME |
358 ATTR_MTIME_SET | ATTR_ATIME_SET;
359 iap->ia_mtime.tv_sec = v_mtime;
360 iap->ia_atime.tv_sec = v_atime;
361 iap->ia_mtime.tv_nsec = 0;
362 iap->ia_atime.tv_nsec = 0;
363 }
364
365 set_attr:
366 status = nfsd_create_setattr(rqstp, fhp, resfhp, &attrs);
367
368 out:
369 inode_unlock(inode);
370 if (child && !IS_ERR(child))
371 dput(child);
372 fh_drop_write(fhp);
373 return status;
374 }
375
376 static __be32
377 nfsd3_proc_create(struct svc_rqst *rqstp)
378 {
379 struct nfsd3_createargs *argp = rqstp->rq_argp;
380 struct nfsd3_diropres *resp = rqstp->rq_resp;
381 svc_fh *dirfhp, *newfhp;
382
383 dprintk("nfsd: CREATE(3) %s %.*s\n",
384 SVCFH_fmt(&argp->fh),
385 argp->len,
386 argp->name);
387
388 dirfhp = fh_copy(&resp->dirfh, &argp->fh);
389 newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
390
391 resp->status = nfsd3_create_file(rqstp, dirfhp, newfhp, argp);
392 resp->status = nfsd3_map_status(resp->status);
393 return rpc_success;
394 }
395
396 /*
397 * Make directory. This operation is not idempotent.
398 */
399 static __be32
400 nfsd3_proc_mkdir(struct svc_rqst *rqstp)
401 {
402 struct nfsd3_createargs *argp = rqstp->rq_argp;
403 struct nfsd3_diropres *resp = rqstp->rq_resp;
404 struct nfsd_attrs attrs = {
405 .na_iattr = &argp->attrs,
406 };
407
408 dprintk("nfsd: MKDIR(3) %s %.*s\n",
409 SVCFH_fmt(&argp->fh),
410 argp->len,
411 argp->name);
412
413 argp->attrs.ia_valid &= ~ATTR_SIZE;
414 fh_copy(&resp->dirfh, &argp->fh);
415 fh_init(&resp->fh, NFS3_FHSIZE);
416 resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
417 &attrs, S_IFDIR, 0, &resp->fh);
418 resp->status = nfsd3_map_status(resp->status);
419 return rpc_success;
420 }
421
422 static __be32
423 nfsd3_proc_symlink(struct svc_rqst *rqstp)
424 {
425 struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
426 struct nfsd3_diropres *resp = rqstp->rq_resp;
427 struct nfsd_attrs attrs = {
428 .na_iattr = &argp->attrs,
429 };
430
431 if (argp->tlen == 0) {
432 resp->status = nfserr_inval;
433 goto out;
434 }
435 if (argp->tlen > NFS3_MAXPATHLEN) {
436 resp->status = nfserr_nametoolong;
437 goto out;
438 }
439
440 argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
441 page_address(rqstp->rq_arg.pages[0]),
442 argp->tlen);
443 if (IS_ERR(argp->tname)) {
444 resp->status = nfserrno(PTR_ERR(argp->tname));
445 goto out;
446 }
447
448 dprintk("nfsd: SYMLINK(3) %s %.*s -> %.*s\n",
449 SVCFH_fmt(&argp->ffh),
450 argp->flen, argp->fname,
451 argp->tlen, argp->tname);
452
453 fh_copy(&resp->dirfh, &argp->ffh);
454 fh_init(&resp->fh, NFS3_FHSIZE);
455 resp->status = nfsd_symlink(rqstp, &resp->dirfh, argp->fname,
456 argp->flen, argp->tname, &attrs, &resp->fh);
457 kfree(argp->tname);
458 out:
459 resp->status = nfsd3_map_status(resp->status);
460 return rpc_success;
461 }
462
463 /*
464 * Make socket/fifo/device.
465 */
466 static __be32
467 nfsd3_proc_mknod(struct svc_rqst *rqstp)
468 {
469 struct nfsd3_mknodargs *argp = rqstp->rq_argp;
470 struct nfsd3_diropres *resp = rqstp->rq_resp;
471 struct nfsd_attrs attrs = {
472 .na_iattr = &argp->attrs,
473 };
474 int type;
475 dev_t rdev = 0;
476
477 dprintk("nfsd: MKNOD(3) %s %.*s\n",
478 SVCFH_fmt(&argp->fh),
479 argp->len,
480 argp->name);
481
482 fh_copy(&resp->dirfh, &argp->fh);
483 fh_init(&resp->fh, NFS3_FHSIZE);
484
485 if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
486 rdev = MKDEV(argp->major, argp->minor);
487 if (MAJOR(rdev) != argp->major ||
488 MINOR(rdev) != argp->minor) {
489 resp->status = nfserr_inval;
490 goto out;
491 }
492 } else if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO) {
493 resp->status = nfserr_badtype;
494 goto out;
495 }
496
497 type = nfs3_ftypes[argp->ftype];
498 resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
499 &attrs, type, rdev, &resp->fh);
500 out:
501 resp->status = nfsd3_map_status(resp->status);
502 return rpc_success;
503 }
504
505 /*
506 * Remove file/fifo/socket etc.
507 */
508 static __be32
509 nfsd3_proc_remove(struct svc_rqst *rqstp)
510 {
511 struct nfsd3_diropargs *argp = rqstp->rq_argp;
512 struct nfsd3_attrstat *resp = rqstp->rq_resp;
513
514 dprintk("nfsd: REMOVE(3) %s %.*s\n",
515 SVCFH_fmt(&argp->fh),
516 argp->len,
517 argp->name);
518
519 /* Unlink. -S_IFDIR means file must not be a directory */
520 fh_copy(&resp->fh, &argp->fh);
521 resp->status = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR,
522 argp->name, argp->len);
523 resp->status = nfsd3_map_status(resp->status);
524 return rpc_success;
525 }
526
527 /*
528 * Remove a directory
529 */
530 static __be32
531 nfsd3_proc_rmdir(struct svc_rqst *rqstp)
532 {
533 struct nfsd3_diropargs *argp = rqstp->rq_argp;
534 struct nfsd3_attrstat *resp = rqstp->rq_resp;
535
536 dprintk("nfsd: RMDIR(3) %s %.*s\n",
537 SVCFH_fmt(&argp->fh),
538 argp->len,
539 argp->name);
540
541 fh_copy(&resp->fh, &argp->fh);
542 resp->status = nfsd_unlink(rqstp, &resp->fh, S_IFDIR,
543 argp->name, argp->len);
544 resp->status = nfsd3_map_status(resp->status);
545 return rpc_success;
546 }
547
548 static __be32
549 nfsd3_proc_rename(struct svc_rqst *rqstp)
550 {
551 struct nfsd3_renameargs *argp = rqstp->rq_argp;
552 struct nfsd3_renameres *resp = rqstp->rq_resp;
553
554 dprintk("nfsd: RENAME(3) %s %.*s ->\n",
555 SVCFH_fmt(&argp->ffh),
556 argp->flen,
557 argp->fname);
558 dprintk("nfsd: -> %s %.*s\n",
559 SVCFH_fmt(&argp->tfh),
560 argp->tlen,
561 argp->tname);
562
563 fh_copy(&resp->ffh, &argp->ffh);
564 fh_copy(&resp->tfh, &argp->tfh);
565 resp->status = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
566 &resp->tfh, argp->tname, argp->tlen);
567 resp->status = nfsd3_map_status(resp->status);
568 return rpc_success;
569 }
570
571 static __be32
572 nfsd3_proc_link(struct svc_rqst *rqstp)
573 {
574 struct nfsd3_linkargs *argp = rqstp->rq_argp;
575 struct nfsd3_linkres *resp = rqstp->rq_resp;
576
577 dprintk("nfsd: LINK(3) %s ->\n",
578 SVCFH_fmt(&argp->ffh));
579 dprintk("nfsd: -> %s %.*s\n",
580 SVCFH_fmt(&argp->tfh),
581 argp->tlen,
582 argp->tname);
583
584 fh_copy(&resp->fh, &argp->ffh);
585 fh_copy(&resp->tfh, &argp->tfh);
586 resp->status = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
587 &resp->fh);
588 resp->status = nfsd3_map_status(resp->status);
589 return rpc_success;
590 }
591
592 static void nfsd3_init_dirlist_pages(struct svc_rqst *rqstp,
593 struct nfsd3_readdirres *resp,
594 u32 count)
595 {
596 struct xdr_buf *buf = &resp->dirlist;
597 struct xdr_stream *xdr = &resp->xdr;
598 unsigned int sendbuf = min_t(unsigned int, rqstp->rq_res.buflen,
599 svc_max_payload(rqstp));
600
601 memset(buf, 0, sizeof(*buf));
602
603 /* Reserve room for the NULL ptr & eof flag (-2 words) */
604 buf->buflen = clamp(count, (u32)(XDR_UNIT * 2), sendbuf);
605 buf->buflen -= XDR_UNIT * 2;
606 buf->pages = rqstp->rq_next_page;
607 rqstp->rq_next_page += (buf->buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
608
609 xdr_init_encode_pages(xdr, buf, buf->pages, NULL);
610 }
611
612 /*
613 * Read a portion of a directory.
614 */
615 static __be32
616 nfsd3_proc_readdir(struct svc_rqst *rqstp)
617 {
618 struct nfsd3_readdirargs *argp = rqstp->rq_argp;
619 struct nfsd3_readdirres *resp = rqstp->rq_resp;
620 loff_t offset;
621
622 dprintk("nfsd: READDIR(3) %s %d bytes at %d\n",
623 SVCFH_fmt(&argp->fh),
624 argp->count, (u32) argp->cookie);
625
626 nfsd3_init_dirlist_pages(rqstp, resp, argp->count);
627
628 fh_copy(&resp->fh, &argp->fh);
629 resp->common.err = nfs_ok;
630 resp->cookie_offset = 0;
631 resp->rqstp = rqstp;
632 offset = argp->cookie;
633 resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
634 &resp->common, nfs3svc_encode_entry3);
635 memcpy(resp->verf, argp->verf, 8);
636 nfs3svc_encode_cookie3(resp, offset);
637
638 /* Recycle only pages that were part of the reply */
639 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
640
641 resp->status = nfsd3_map_status(resp->status);
642 return rpc_success;
643 }
644
645 /*
646 * Read a portion of a directory, including file handles and attrs.
647 * For now, we choose to ignore the dircount parameter.
648 */
649 static __be32
650 nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
651 {
652 struct nfsd3_readdirargs *argp = rqstp->rq_argp;
653 struct nfsd3_readdirres *resp = rqstp->rq_resp;
654 loff_t offset;
655
656 dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
657 SVCFH_fmt(&argp->fh),
658 argp->count, (u32) argp->cookie);
659
660 nfsd3_init_dirlist_pages(rqstp, resp, argp->count);
661
662 fh_copy(&resp->fh, &argp->fh);
663 resp->common.err = nfs_ok;
664 resp->cookie_offset = 0;
665 resp->rqstp = rqstp;
666 offset = argp->cookie;
667
668 resp->status = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
669 if (resp->status != nfs_ok)
670 goto out;
671
672 if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS) {
673 resp->status = nfserr_notsupp;
674 goto out;
675 }
676
677 resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
678 &resp->common, nfs3svc_encode_entryplus3);
679 memcpy(resp->verf, argp->verf, 8);
680 nfs3svc_encode_cookie3(resp, offset);
681
682 /* Recycle only pages that were part of the reply */
683 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
684
685 out:
686 resp->status = nfsd3_map_status(resp->status);
687 return rpc_success;
688 }
689
690 /*
691 * Get file system stats
692 */
693 static __be32
694 nfsd3_proc_fsstat(struct svc_rqst *rqstp)
695 {
696 struct nfsd_fhandle *argp = rqstp->rq_argp;
697 struct nfsd3_fsstatres *resp = rqstp->rq_resp;
698
699 dprintk("nfsd: FSSTAT(3) %s\n",
700 SVCFH_fmt(&argp->fh));
701
702 resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
703 fh_put(&argp->fh);
704 resp->status = nfsd3_map_status(resp->status);
705 return rpc_success;
706 }
707
708 /*
709 * Get file system info
710 */
711 static __be32
712 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
713 {
714 struct nfsd_fhandle *argp = rqstp->rq_argp;
715 struct nfsd3_fsinfores *resp = rqstp->rq_resp;
716 u32 max_blocksize = svc_max_payload(rqstp);
717
718 dprintk("nfsd: FSINFO(3) %s\n",
719 SVCFH_fmt(&argp->fh));
720
721 resp->f_rtmax = max_blocksize;
722 resp->f_rtpref = max_blocksize;
723 resp->f_rtmult = PAGE_SIZE;
724 resp->f_wtmax = max_blocksize;
725 resp->f_wtpref = max_blocksize;
726 resp->f_wtmult = PAGE_SIZE;
727 resp->f_dtpref = max_blocksize;
728 resp->f_maxfilesize = ~(u32) 0;
729 resp->f_properties = NFS3_FSF_DEFAULT;
730
731 resp->status = fh_verify(rqstp, &argp->fh, 0,
732 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
733
734 /* Check special features of the file system. May request
735 * different read/write sizes for file systems known to have
736 * problems with large blocks */
737 if (resp->status == nfs_ok) {
738 struct super_block *sb = argp->fh.fh_dentry->d_sb;
739
740 /* Note that we don't care for remote fs's here */
741 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
742 resp->f_properties = NFS3_FSF_BILLYBOY;
743 }
744 resp->f_maxfilesize = sb->s_maxbytes;
745 }
746
747 fh_put(&argp->fh);
748 resp->status = nfsd3_map_status(resp->status);
749 return rpc_success;
750 }
751
752 /*
753 * Get pathconf info for the specified file
754 */
755 static __be32
756 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
757 {
758 struct nfsd_fhandle *argp = rqstp->rq_argp;
759 struct nfsd3_pathconfres *resp = rqstp->rq_resp;
760
761 dprintk("nfsd: PATHCONF(3) %s\n",
762 SVCFH_fmt(&argp->fh));
763
764 /* Set default pathconf */
765 resp->p_link_max = 255; /* at least */
766 resp->p_name_max = 255; /* at least */
767 resp->p_no_trunc = 0;
768 resp->p_chown_restricted = 1;
769 resp->p_case_insensitive = 0;
770 resp->p_case_preserving = 1;
771
772 resp->status = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
773
774 if (resp->status == nfs_ok) {
775 struct super_block *sb = argp->fh.fh_dentry->d_sb;
776
777 /* Note that we don't care for remote fs's here */
778 switch (sb->s_magic) {
779 case EXT2_SUPER_MAGIC:
780 resp->p_link_max = EXT2_LINK_MAX;
781 resp->p_name_max = EXT2_NAME_LEN;
782 break;
783 case MSDOS_SUPER_MAGIC:
784 resp->p_case_insensitive = 1;
785 resp->p_case_preserving = 0;
786 break;
787 }
788 }
789
790 fh_put(&argp->fh);
791 resp->status = nfsd3_map_status(resp->status);
792 return rpc_success;
793 }
794
795 /*
796 * Commit a file (range) to stable storage.
797 */
798 static __be32
799 nfsd3_proc_commit(struct svc_rqst *rqstp)
800 {
801 struct nfsd3_commitargs *argp = rqstp->rq_argp;
802 struct nfsd3_commitres *resp = rqstp->rq_resp;
803 struct nfsd_file *nf;
804
805 dprintk("nfsd: COMMIT(3) %s %u@%Lu\n",
806 SVCFH_fmt(&argp->fh),
807 argp->count,
808 (unsigned long long) argp->offset);
809
810 fh_copy(&resp->fh, &argp->fh);
811 resp->status = nfsd_file_acquire_gc(rqstp, &resp->fh, NFSD_MAY_WRITE |
812 NFSD_MAY_NOT_BREAK_LEASE, &nf);
813 if (resp->status)
814 goto out;
815 resp->status = nfsd_commit(rqstp, &resp->fh, nf, argp->offset,
816 argp->count, resp->verf);
817 nfsd_file_put(nf);
818 out:
819 resp->status = nfsd3_map_status(resp->status);
820 return rpc_success;
821 }
822
823
824 /*
825 * NFSv3 Server procedures.
826 * Only the results of non-idempotent operations are cached.
827 */
828 #define nfs3svc_encode_attrstatres nfs3svc_encode_attrstat
829 #define nfs3svc_encode_wccstatres nfs3svc_encode_wccstat
830 #define nfsd3_mkdirargs nfsd3_createargs
831 #define nfsd3_readdirplusargs nfsd3_readdirargs
832 #define nfsd3_fhandleargs nfsd_fhandle
833 #define nfsd3_attrstatres nfsd3_attrstat
834 #define nfsd3_wccstatres nfsd3_attrstat
835 #define nfsd3_createres nfsd3_diropres
836
837 #define ST 1 /* status*/
838 #define FH 17 /* filehandle with length */
839 #define AT 21 /* attributes */
840 #define pAT (1+AT) /* post attributes - conditional */
841 #define WC (7+pAT) /* WCC attributes */
842
843 static const struct svc_procedure nfsd_procedures3[22] = {
844 [NFS3PROC_NULL] = {
845 .pc_func = nfsd3_proc_null,
846 .pc_decode = nfssvc_decode_voidarg,
847 .pc_encode = nfssvc_encode_voidres,
848 .pc_argsize = sizeof(struct nfsd_voidargs),
849 .pc_argzero = sizeof(struct nfsd_voidargs),
850 .pc_ressize = sizeof(struct nfsd_voidres),
851 .pc_cachetype = RC_NOCACHE,
852 .pc_xdrressize = ST,
853 .pc_name = "NULL",
854 },
855 [NFS3PROC_GETATTR] = {
856 .pc_func = nfsd3_proc_getattr,
857 .pc_decode = nfs3svc_decode_fhandleargs,
858 .pc_encode = nfs3svc_encode_getattrres,
859 .pc_release = nfs3svc_release_fhandle,
860 .pc_argsize = sizeof(struct nfsd_fhandle),
861 .pc_argzero = sizeof(struct nfsd_fhandle),
862 .pc_ressize = sizeof(struct nfsd3_attrstatres),
863 .pc_cachetype = RC_NOCACHE,
864 .pc_xdrressize = ST+AT,
865 .pc_name = "GETATTR",
866 },
867 [NFS3PROC_SETATTR] = {
868 .pc_func = nfsd3_proc_setattr,
869 .pc_decode = nfs3svc_decode_sattrargs,
870 .pc_encode = nfs3svc_encode_wccstatres,
871 .pc_release = nfs3svc_release_fhandle,
872 .pc_argsize = sizeof(struct nfsd3_sattrargs),
873 .pc_argzero = sizeof(struct nfsd3_sattrargs),
874 .pc_ressize = sizeof(struct nfsd3_wccstatres),
875 .pc_cachetype = RC_REPLBUFF,
876 .pc_xdrressize = ST+WC,
877 .pc_name = "SETATTR",
878 },
879 [NFS3PROC_LOOKUP] = {
880 .pc_func = nfsd3_proc_lookup,
881 .pc_decode = nfs3svc_decode_diropargs,
882 .pc_encode = nfs3svc_encode_lookupres,
883 .pc_release = nfs3svc_release_fhandle2,
884 .pc_argsize = sizeof(struct nfsd3_diropargs),
885 .pc_argzero = sizeof(struct nfsd3_diropargs),
886 .pc_ressize = sizeof(struct nfsd3_diropres),
887 .pc_cachetype = RC_NOCACHE,
888 .pc_xdrressize = ST+FH+pAT+pAT,
889 .pc_name = "LOOKUP",
890 },
891 [NFS3PROC_ACCESS] = {
892 .pc_func = nfsd3_proc_access,
893 .pc_decode = nfs3svc_decode_accessargs,
894 .pc_encode = nfs3svc_encode_accessres,
895 .pc_release = nfs3svc_release_fhandle,
896 .pc_argsize = sizeof(struct nfsd3_accessargs),
897 .pc_argzero = sizeof(struct nfsd3_accessargs),
898 .pc_ressize = sizeof(struct nfsd3_accessres),
899 .pc_cachetype = RC_NOCACHE,
900 .pc_xdrressize = ST+pAT+1,
901 .pc_name = "ACCESS",
902 },
903 [NFS3PROC_READLINK] = {
904 .pc_func = nfsd3_proc_readlink,
905 .pc_decode = nfs3svc_decode_fhandleargs,
906 .pc_encode = nfs3svc_encode_readlinkres,
907 .pc_release = nfs3svc_release_fhandle,
908 .pc_argsize = sizeof(struct nfsd_fhandle),
909 .pc_argzero = sizeof(struct nfsd_fhandle),
910 .pc_ressize = sizeof(struct nfsd3_readlinkres),
911 .pc_cachetype = RC_NOCACHE,
912 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
913 .pc_name = "READLINK",
914 },
915 [NFS3PROC_READ] = {
916 .pc_func = nfsd3_proc_read,
917 .pc_decode = nfs3svc_decode_readargs,
918 .pc_encode = nfs3svc_encode_readres,
919 .pc_release = nfs3svc_release_fhandle,
920 .pc_argsize = sizeof(struct nfsd3_readargs),
921 .pc_argzero = sizeof(struct nfsd3_readargs),
922 .pc_ressize = sizeof(struct nfsd3_readres),
923 .pc_cachetype = RC_NOCACHE,
924 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
925 .pc_name = "READ",
926 },
927 [NFS3PROC_WRITE] = {
928 .pc_func = nfsd3_proc_write,
929 .pc_decode = nfs3svc_decode_writeargs,
930 .pc_encode = nfs3svc_encode_writeres,
931 .pc_release = nfs3svc_release_fhandle,
932 .pc_argsize = sizeof(struct nfsd3_writeargs),
933 .pc_argzero = sizeof(struct nfsd3_writeargs),
934 .pc_ressize = sizeof(struct nfsd3_writeres),
935 .pc_cachetype = RC_REPLBUFF,
936 .pc_xdrressize = ST+WC+4,
937 .pc_name = "WRITE",
938 },
939 [NFS3PROC_CREATE] = {
940 .pc_func = nfsd3_proc_create,
941 .pc_decode = nfs3svc_decode_createargs,
942 .pc_encode = nfs3svc_encode_createres,
943 .pc_release = nfs3svc_release_fhandle2,
944 .pc_argsize = sizeof(struct nfsd3_createargs),
945 .pc_argzero = sizeof(struct nfsd3_createargs),
946 .pc_ressize = sizeof(struct nfsd3_createres),
947 .pc_cachetype = RC_REPLBUFF,
948 .pc_xdrressize = ST+(1+FH+pAT)+WC,
949 .pc_name = "CREATE",
950 },
951 [NFS3PROC_MKDIR] = {
952 .pc_func = nfsd3_proc_mkdir,
953 .pc_decode = nfs3svc_decode_mkdirargs,
954 .pc_encode = nfs3svc_encode_createres,
955 .pc_release = nfs3svc_release_fhandle2,
956 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
957 .pc_argzero = sizeof(struct nfsd3_mkdirargs),
958 .pc_ressize = sizeof(struct nfsd3_createres),
959 .pc_cachetype = RC_REPLBUFF,
960 .pc_xdrressize = ST+(1+FH+pAT)+WC,
961 .pc_name = "MKDIR",
962 },
963 [NFS3PROC_SYMLINK] = {
964 .pc_func = nfsd3_proc_symlink,
965 .pc_decode = nfs3svc_decode_symlinkargs,
966 .pc_encode = nfs3svc_encode_createres,
967 .pc_release = nfs3svc_release_fhandle2,
968 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
969 .pc_argzero = sizeof(struct nfsd3_symlinkargs),
970 .pc_ressize = sizeof(struct nfsd3_createres),
971 .pc_cachetype = RC_REPLBUFF,
972 .pc_xdrressize = ST+(1+FH+pAT)+WC,
973 .pc_name = "SYMLINK",
974 },
975 [NFS3PROC_MKNOD] = {
976 .pc_func = nfsd3_proc_mknod,
977 .pc_decode = nfs3svc_decode_mknodargs,
978 .pc_encode = nfs3svc_encode_createres,
979 .pc_release = nfs3svc_release_fhandle2,
980 .pc_argsize = sizeof(struct nfsd3_mknodargs),
981 .pc_argzero = sizeof(struct nfsd3_mknodargs),
982 .pc_ressize = sizeof(struct nfsd3_createres),
983 .pc_cachetype = RC_REPLBUFF,
984 .pc_xdrressize = ST+(1+FH+pAT)+WC,
985 .pc_name = "MKNOD",
986 },
987 [NFS3PROC_REMOVE] = {
988 .pc_func = nfsd3_proc_remove,
989 .pc_decode = nfs3svc_decode_diropargs,
990 .pc_encode = nfs3svc_encode_wccstatres,
991 .pc_release = nfs3svc_release_fhandle,
992 .pc_argsize = sizeof(struct nfsd3_diropargs),
993 .pc_argzero = sizeof(struct nfsd3_diropargs),
994 .pc_ressize = sizeof(struct nfsd3_wccstatres),
995 .pc_cachetype = RC_REPLBUFF,
996 .pc_xdrressize = ST+WC,
997 .pc_name = "REMOVE",
998 },
999 [NFS3PROC_RMDIR] = {
1000 .pc_func = nfsd3_proc_rmdir,
1001 .pc_decode = nfs3svc_decode_diropargs,
1002 .pc_encode = nfs3svc_encode_wccstatres,
1003 .pc_release = nfs3svc_release_fhandle,
1004 .pc_argsize = sizeof(struct nfsd3_diropargs),
1005 .pc_argzero = sizeof(struct nfsd3_diropargs),
1006 .pc_ressize = sizeof(struct nfsd3_wccstatres),
1007 .pc_cachetype = RC_REPLBUFF,
1008 .pc_xdrressize = ST+WC,
1009 .pc_name = "RMDIR",
1010 },
1011 [NFS3PROC_RENAME] = {
1012 .pc_func = nfsd3_proc_rename,
1013 .pc_decode = nfs3svc_decode_renameargs,
1014 .pc_encode = nfs3svc_encode_renameres,
1015 .pc_release = nfs3svc_release_fhandle2,
1016 .pc_argsize = sizeof(struct nfsd3_renameargs),
1017 .pc_argzero = sizeof(struct nfsd3_renameargs),
1018 .pc_ressize = sizeof(struct nfsd3_renameres),
1019 .pc_cachetype = RC_REPLBUFF,
1020 .pc_xdrressize = ST+WC+WC,
1021 .pc_name = "RENAME",
1022 },
1023 [NFS3PROC_LINK] = {
1024 .pc_func = nfsd3_proc_link,
1025 .pc_decode = nfs3svc_decode_linkargs,
1026 .pc_encode = nfs3svc_encode_linkres,
1027 .pc_release = nfs3svc_release_fhandle2,
1028 .pc_argsize = sizeof(struct nfsd3_linkargs),
1029 .pc_argzero = sizeof(struct nfsd3_linkargs),
1030 .pc_ressize = sizeof(struct nfsd3_linkres),
1031 .pc_cachetype = RC_REPLBUFF,
1032 .pc_xdrressize = ST+pAT+WC,
1033 .pc_name = "LINK",
1034 },
1035 [NFS3PROC_READDIR] = {
1036 .pc_func = nfsd3_proc_readdir,
1037 .pc_decode = nfs3svc_decode_readdirargs,
1038 .pc_encode = nfs3svc_encode_readdirres,
1039 .pc_release = nfs3svc_release_fhandle,
1040 .pc_argsize = sizeof(struct nfsd3_readdirargs),
1041 .pc_argzero = sizeof(struct nfsd3_readdirargs),
1042 .pc_ressize = sizeof(struct nfsd3_readdirres),
1043 .pc_cachetype = RC_NOCACHE,
1044 .pc_name = "READDIR",
1045 },
1046 [NFS3PROC_READDIRPLUS] = {
1047 .pc_func = nfsd3_proc_readdirplus,
1048 .pc_decode = nfs3svc_decode_readdirplusargs,
1049 .pc_encode = nfs3svc_encode_readdirres,
1050 .pc_release = nfs3svc_release_fhandle,
1051 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
1052 .pc_argzero = sizeof(struct nfsd3_readdirplusargs),
1053 .pc_ressize = sizeof(struct nfsd3_readdirres),
1054 .pc_cachetype = RC_NOCACHE,
1055 .pc_name = "READDIRPLUS",
1056 },
1057 [NFS3PROC_FSSTAT] = {
1058 .pc_func = nfsd3_proc_fsstat,
1059 .pc_decode = nfs3svc_decode_fhandleargs,
1060 .pc_encode = nfs3svc_encode_fsstatres,
1061 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
1062 .pc_argzero = sizeof(struct nfsd3_fhandleargs),
1063 .pc_ressize = sizeof(struct nfsd3_fsstatres),
1064 .pc_cachetype = RC_NOCACHE,
1065 .pc_xdrressize = ST+pAT+2*6+1,
1066 .pc_name = "FSSTAT",
1067 },
1068 [NFS3PROC_FSINFO] = {
1069 .pc_func = nfsd3_proc_fsinfo,
1070 .pc_decode = nfs3svc_decode_fhandleargs,
1071 .pc_encode = nfs3svc_encode_fsinfores,
1072 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
1073 .pc_argzero = sizeof(struct nfsd3_fhandleargs),
1074 .pc_ressize = sizeof(struct nfsd3_fsinfores),
1075 .pc_cachetype = RC_NOCACHE,
1076 .pc_xdrressize = ST+pAT+12,
1077 .pc_name = "FSINFO",
1078 },
1079 [NFS3PROC_PATHCONF] = {
1080 .pc_func = nfsd3_proc_pathconf,
1081 .pc_decode = nfs3svc_decode_fhandleargs,
1082 .pc_encode = nfs3svc_encode_pathconfres,
1083 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
1084 .pc_argzero = sizeof(struct nfsd3_fhandleargs),
1085 .pc_ressize = sizeof(struct nfsd3_pathconfres),
1086 .pc_cachetype = RC_NOCACHE,
1087 .pc_xdrressize = ST+pAT+6,
1088 .pc_name = "PATHCONF",
1089 },
1090 [NFS3PROC_COMMIT] = {
1091 .pc_func = nfsd3_proc_commit,
1092 .pc_decode = nfs3svc_decode_commitargs,
1093 .pc_encode = nfs3svc_encode_commitres,
1094 .pc_release = nfs3svc_release_fhandle,
1095 .pc_argsize = sizeof(struct nfsd3_commitargs),
1096 .pc_argzero = sizeof(struct nfsd3_commitargs),
1097 .pc_ressize = sizeof(struct nfsd3_commitres),
1098 .pc_cachetype = RC_NOCACHE,
1099 .pc_xdrressize = ST+WC+2,
1100 .pc_name = "COMMIT",
1101 },
1102 };
1103
1104 static DEFINE_PER_CPU_ALIGNED(unsigned long,
1105 nfsd_count3[ARRAY_SIZE(nfsd_procedures3)]);
1106 const struct svc_version nfsd_version3 = {
1107 .vs_vers = 3,
1108 .vs_nproc = ARRAY_SIZE(nfsd_procedures3),
1109 .vs_proc = nfsd_procedures3,
1110 .vs_dispatch = nfsd_dispatch,
1111 .vs_count = nfsd_count3,
1112 .vs_xdrsize = NFS3_SVC_XDRSIZE,
1113 };
Linux Kernel