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