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#include "trace.h"
18
19#define NFSDDBG_FACILITY NFSDDBG_PROC
20
21static int nfs3_ftypes[] = {
22 0, /* NF3NON */
23 S_IFREG, /* NF3REG */
24 S_IFDIR, /* NF3DIR */
25 S_IFBLK, /* NF3BLK */
26 S_IFCHR, /* NF3CHR */
27 S_IFLNK, /* NF3LNK */
28 S_IFSOCK, /* NF3SOCK */
29 S_IFIFO, /* NF3FIFO */
30};
31
32static __be32 nfsd3_map_status(__be32 status)
33{
34 switch (status) {
35 case nfs_ok:
36 break;
37 case nfserr_nofilehandle:
38 status = nfserr_badhandle;
39 break;
40 case nfserr_wrongsec:
41 case nfserr_file_open:
42 status = nfserr_acces;
43 break;
44 case nfserr_symlink_not_dir:
45 status = nfserr_notdir;
46 break;
47 case nfserr_symlink:
48 case nfserr_wrong_type:
49 status = nfserr_inval;
50 break;
51 }
52 return status;
53}
54
55/*
56 * NULL call.
57 */
58static __be32
59nfsd3_proc_null(struct svc_rqst *rqstp)
60{
61 return rpc_success;
62}
63
64/*
65 * Get a file's attributes
66 */
67static __be32
68nfsd3_proc_getattr(struct svc_rqst *rqstp)
69{
70 struct nfsd_fhandle *argp = rqstp->rq_argp;
71 struct nfsd3_attrstat *resp = rqstp->rq_resp;
72
73 trace_nfsd_vfs_getattr(rqstp, fhp: &argp->fh);
74
75 fh_copy(dst: &resp->fh, src: &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(fhp: &resp->fh, stat: &resp->stat);
82out:
83 resp->status = nfsd3_map_status(status: resp->status);
84 return rpc_success;
85}
86
87/*
88 * Set a file's attributes
89 */
90static __be32
91nfsd3_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(dst: &resp->fh, src: &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(status: resp->status);
108 return rpc_success;
109}
110
111/*
112 * Look up a path name component
113 */
114static __be32
115nfsd3_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(dst: &resp->dirfh, src: &argp->fh);
126 fh_init(fhp: &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(status: resp->status);
132 return rpc_success;
133}
134
135/*
136 * Check file access
137 */
138static __be32
139nfsd3_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(dst: &resp->fh, src: &argp->fh);
149 resp->access = argp->access;
150 resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
151 resp->status = nfsd3_map_status(status: resp->status);
152 return rpc_success;
153}
154
155/*
156 * Read a symlink.
157 */
158static __be32
159nfsd3_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(dst: &resp->fh, src: &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(status: resp->status);
173 return rpc_success;
174}
175
176/*
177 * Read a portion of a file.
178 */
179static __be32
180nfsd3_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, space: ((1 + NFS3_POST_OP_ATTR_WORDS + 3) << 2) +
205 resp->count + 4);
206
207 fh_copy(dst: &resp->fh, src: &argp->fh);
208 resp->status = nfsd_read(rqstp, fhp: &resp->fh, offset: argp->offset,
209 count: &resp->count, eof: &resp->eof);
210 resp->status = nfsd3_map_status(status: resp->status);
211 return rpc_success;
212}
213
214/*
215 * Write data to a file
216 */
217static __be32
218nfsd3_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
224 dprintk("nfsd: WRITE(3) %s %d bytes at %Lu%s\n",
225 SVCFH_fmt(&argp->fh),
226 argp->len,
227 (unsigned long long) argp->offset,
228 argp->stable ? " stable" : "");
229
230 resp->status = nfserr_fbig;
231 if (argp->offset > (u64)OFFSET_MAX ||
232 argp->offset + argp->len > (u64)OFFSET_MAX)
233 return rpc_success;
234
235 fh_copy(dst: &resp->fh, src: &argp->fh);
236 resp->committed = argp->stable;
237 resp->status = nfsd_write(rqstp, fhp: &resp->fh, offset: argp->offset,
238 payload: &argp->payload, cnt: &cnt,
239 stable: resp->committed, verf: resp->verf);
240 resp->count = cnt;
241 resp->status = nfsd3_map_status(status: resp->status);
242 return rpc_success;
243}
244
245/*
246 * Implement NFSv3's unchecked, guarded, and exclusive CREATE
247 * semantics for regular files. Except for the created file,
248 * this operation is stateless on the server.
249 *
250 * Upon return, caller must release @fhp and @resfhp.
251 */
252static __be32
253nfsd3_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
254 struct svc_fh *resfhp, struct nfsd3_createargs *argp)
255{
256 struct iattr *iap = &argp->attrs;
257 struct dentry *parent, *child;
258 struct nfsd_attrs attrs = {
259 .na_iattr = iap,
260 };
261 __u32 v_mtime, v_atime;
262 struct inode *inode;
263 __be32 status;
264 int host_err;
265
266 trace_nfsd_vfs_create(rqstp, fhp, S_IFREG, name: argp->name, len: argp->len);
267
268 if (isdotent(argp->name, argp->len))
269 return nfserr_exist;
270 if (!(iap->ia_valid & ATTR_MODE))
271 iap->ia_mode = 0;
272
273 status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
274 if (status != nfs_ok)
275 return status;
276
277 parent = fhp->fh_dentry;
278 inode = d_inode(dentry: parent);
279
280 host_err = fh_want_write(fhp);
281 if (host_err)
282 return nfserrno(errno: host_err);
283
284 child = start_creating(idmap: &nop_mnt_idmap, parent,
285 name: &QSTR_LEN(argp->name, argp->len));
286 if (IS_ERR(ptr: child)) {
287 status = nfserrno(errno: PTR_ERR(ptr: child));
288 goto out_write;
289 }
290
291 if (d_really_is_negative(dentry: child)) {
292 status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
293 if (status != nfs_ok)
294 goto out;
295 }
296
297 status = fh_compose(resfhp, fhp->fh_export, child, fhp);
298 if (status != nfs_ok)
299 goto out;
300
301 v_mtime = 0;
302 v_atime = 0;
303 if (argp->createmode == NFS3_CREATE_EXCLUSIVE) {
304 u32 *verifier = (u32 *)argp->verf;
305
306 /*
307 * Solaris 7 gets confused (bugid 4218508) if these have
308 * the high bit set, as do xfs filesystems without the
309 * "bigtime" feature. So just clear the high bits.
310 */
311 v_mtime = verifier[0] & 0x7fffffff;
312 v_atime = verifier[1] & 0x7fffffff;
313 }
314
315 if (d_really_is_positive(dentry: child)) {
316 status = nfs_ok;
317
318 switch (argp->createmode) {
319 case NFS3_CREATE_UNCHECKED:
320 if (!d_is_reg(dentry: child))
321 break;
322 iap->ia_valid &= ATTR_SIZE;
323 goto set_attr;
324 case NFS3_CREATE_GUARDED:
325 status = nfserr_exist;
326 break;
327 case NFS3_CREATE_EXCLUSIVE:
328 if (inode_get_mtime_sec(inode: d_inode(dentry: child)) == v_mtime &&
329 inode_get_atime_sec(inode: d_inode(dentry: child)) == v_atime &&
330 d_inode(dentry: child)->i_size == 0) {
331 break;
332 }
333 status = nfserr_exist;
334 }
335 goto out;
336 }
337
338 if (!IS_POSIXACL(inode))
339 iap->ia_mode &= ~current_umask();
340
341 status = fh_fill_pre_attrs(fhp);
342 if (status != nfs_ok)
343 goto out;
344 host_err = vfs_create(&nop_mnt_idmap, child, iap->ia_mode, NULL);
345 if (host_err < 0) {
346 status = nfserrno(errno: host_err);
347 goto out;
348 }
349 fh_fill_post_attrs(fhp);
350
351 /* A newly created file already has a file size of zero. */
352 if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
353 iap->ia_valid &= ~ATTR_SIZE;
354 if (argp->createmode == NFS3_CREATE_EXCLUSIVE) {
355 iap->ia_valid = ATTR_MTIME | ATTR_ATIME |
356 ATTR_MTIME_SET | ATTR_ATIME_SET;
357 iap->ia_mtime.tv_sec = v_mtime;
358 iap->ia_atime.tv_sec = v_atime;
359 iap->ia_mtime.tv_nsec = 0;
360 iap->ia_atime.tv_nsec = 0;
361 }
362
363set_attr:
364 status = nfsd_create_setattr(rqstp, fhp, resfhp, iap: &attrs);
365
366out:
367 end_creating(child);
368out_write:
369 fh_drop_write(fhp);
370 return status;
371}
372
373static __be32
374nfsd3_proc_create(struct svc_rqst *rqstp)
375{
376 struct nfsd3_createargs *argp = rqstp->rq_argp;
377 struct nfsd3_diropres *resp = rqstp->rq_resp;
378 svc_fh *dirfhp, *newfhp;
379
380 dirfhp = fh_copy(dst: &resp->dirfh, src: &argp->fh);
381 newfhp = fh_init(fhp: &resp->fh, NFS3_FHSIZE);
382
383 resp->status = nfsd3_create_file(rqstp, fhp: dirfhp, resfhp: newfhp, argp);
384 resp->status = nfsd3_map_status(status: resp->status);
385 return rpc_success;
386}
387
388/*
389 * Make directory. This operation is not idempotent.
390 */
391static __be32
392nfsd3_proc_mkdir(struct svc_rqst *rqstp)
393{
394 struct nfsd3_createargs *argp = rqstp->rq_argp;
395 struct nfsd3_diropres *resp = rqstp->rq_resp;
396 struct nfsd_attrs attrs = {
397 .na_iattr = &argp->attrs,
398 };
399
400 argp->attrs.ia_valid &= ~ATTR_SIZE;
401 fh_copy(dst: &resp->dirfh, src: &argp->fh);
402 fh_init(fhp: &resp->fh, NFS3_FHSIZE);
403 resp->status = nfsd_create(rqstp, &resp->dirfh, name: argp->name, len: argp->len,
404 attrs: &attrs, S_IFDIR, rdev: 0, res: &resp->fh);
405 resp->status = nfsd3_map_status(status: resp->status);
406 return rpc_success;
407}
408
409static __be32
410nfsd3_proc_symlink(struct svc_rqst *rqstp)
411{
412 struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
413 struct nfsd3_diropres *resp = rqstp->rq_resp;
414 struct nfsd_attrs attrs = {
415 .na_iattr = &argp->attrs,
416 };
417
418 if (argp->tlen == 0) {
419 resp->status = nfserr_inval;
420 goto out;
421 }
422 if (argp->tlen > NFS3_MAXPATHLEN) {
423 resp->status = nfserr_nametoolong;
424 goto out;
425 }
426
427 argp->tname = svc_fill_symlink_pathname(rqstp, first: &argp->first,
428 page_address(rqstp->rq_arg.pages[0]),
429 total: argp->tlen);
430 if (IS_ERR(ptr: argp->tname)) {
431 resp->status = nfserrno(errno: PTR_ERR(ptr: argp->tname));
432 goto out;
433 }
434
435 fh_copy(dst: &resp->dirfh, src: &argp->ffh);
436 fh_init(fhp: &resp->fh, NFS3_FHSIZE);
437 resp->status = nfsd_symlink(rqstp, &resp->dirfh, name: argp->fname,
438 len: argp->flen, path: argp->tname, attrs: &attrs, res: &resp->fh);
439 kfree(objp: argp->tname);
440out:
441 resp->status = nfsd3_map_status(status: resp->status);
442 return rpc_success;
443}
444
445/*
446 * Make socket/fifo/device.
447 */
448static __be32
449nfsd3_proc_mknod(struct svc_rqst *rqstp)
450{
451 struct nfsd3_mknodargs *argp = rqstp->rq_argp;
452 struct nfsd3_diropres *resp = rqstp->rq_resp;
453 struct nfsd_attrs attrs = {
454 .na_iattr = &argp->attrs,
455 };
456 int type;
457 dev_t rdev = 0;
458
459 fh_copy(dst: &resp->dirfh, src: &argp->fh);
460 fh_init(fhp: &resp->fh, NFS3_FHSIZE);
461
462 if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
463 rdev = MKDEV(argp->major, argp->minor);
464 if (MAJOR(rdev) != argp->major ||
465 MINOR(rdev) != argp->minor) {
466 resp->status = nfserr_inval;
467 goto out;
468 }
469 } else if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO) {
470 resp->status = nfserr_badtype;
471 goto out;
472 }
473
474 type = nfs3_ftypes[argp->ftype];
475 resp->status = nfsd_create(rqstp, &resp->dirfh, name: argp->name, len: argp->len,
476 attrs: &attrs, type, rdev, res: &resp->fh);
477out:
478 resp->status = nfsd3_map_status(status: resp->status);
479 return rpc_success;
480}
481
482/*
483 * Remove file/fifo/socket etc.
484 */
485static __be32
486nfsd3_proc_remove(struct svc_rqst *rqstp)
487{
488 struct nfsd3_diropargs *argp = rqstp->rq_argp;
489 struct nfsd3_attrstat *resp = rqstp->rq_resp;
490
491 /* Unlink. -S_IFDIR means file must not be a directory */
492 fh_copy(dst: &resp->fh, src: &argp->fh);
493 resp->status = nfsd_unlink(rqstp, &resp->fh, type: -S_IFDIR,
494 name: argp->name, len: argp->len);
495 resp->status = nfsd3_map_status(status: resp->status);
496 return rpc_success;
497}
498
499/*
500 * Remove a directory
501 */
502static __be32
503nfsd3_proc_rmdir(struct svc_rqst *rqstp)
504{
505 struct nfsd3_diropargs *argp = rqstp->rq_argp;
506 struct nfsd3_attrstat *resp = rqstp->rq_resp;
507
508 fh_copy(dst: &resp->fh, src: &argp->fh);
509 resp->status = nfsd_unlink(rqstp, &resp->fh, S_IFDIR,
510 name: argp->name, len: argp->len);
511 resp->status = nfsd3_map_status(status: resp->status);
512 return rpc_success;
513}
514
515static __be32
516nfsd3_proc_rename(struct svc_rqst *rqstp)
517{
518 struct nfsd3_renameargs *argp = rqstp->rq_argp;
519 struct nfsd3_renameres *resp = rqstp->rq_resp;
520
521 fh_copy(dst: &resp->ffh, src: &argp->ffh);
522 fh_copy(dst: &resp->tfh, src: &argp->tfh);
523 resp->status = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
524 &resp->tfh, argp->tname, argp->tlen);
525 resp->status = nfsd3_map_status(status: resp->status);
526 return rpc_success;
527}
528
529static __be32
530nfsd3_proc_link(struct svc_rqst *rqstp)
531{
532 struct nfsd3_linkargs *argp = rqstp->rq_argp;
533 struct nfsd3_linkres *resp = rqstp->rq_resp;
534
535 fh_copy(dst: &resp->fh, src: &argp->ffh);
536 fh_copy(dst: &resp->tfh, src: &argp->tfh);
537 resp->status = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
538 &resp->fh);
539 resp->status = nfsd3_map_status(status: resp->status);
540 return rpc_success;
541}
542
543static void nfsd3_init_dirlist_pages(struct svc_rqst *rqstp,
544 struct nfsd3_readdirres *resp,
545 u32 count)
546{
547 struct xdr_buf *buf = &resp->dirlist;
548 struct xdr_stream *xdr = &resp->xdr;
549 unsigned int sendbuf = min_t(unsigned int, rqstp->rq_res.buflen,
550 svc_max_payload(rqstp));
551
552 memset(buf, 0, sizeof(*buf));
553
554 /* Reserve room for the NULL ptr & eof flag (-2 words) */
555 buf->buflen = clamp(count, (u32)(XDR_UNIT * 2), sendbuf);
556 buf->buflen -= XDR_UNIT * 2;
557 buf->pages = rqstp->rq_next_page;
558 rqstp->rq_next_page += (buf->buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
559
560 xdr_init_encode_pages(xdr, buf);
561}
562
563/*
564 * Read a portion of a directory.
565 */
566static __be32
567nfsd3_proc_readdir(struct svc_rqst *rqstp)
568{
569 struct nfsd3_readdirargs *argp = rqstp->rq_argp;
570 struct nfsd3_readdirres *resp = rqstp->rq_resp;
571 loff_t offset;
572
573 trace_nfsd_vfs_readdir(rqstp, fhp: &argp->fh, count: argp->count, offset: argp->cookie);
574
575 nfsd3_init_dirlist_pages(rqstp, resp, count: argp->count);
576
577 fh_copy(dst: &resp->fh, src: &argp->fh);
578 resp->common.err = nfs_ok;
579 resp->cookie_offset = 0;
580 resp->rqstp = rqstp;
581 offset = argp->cookie;
582 resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
583 &resp->common, nfs3svc_encode_entry3);
584 memcpy(resp->verf, argp->verf, 8);
585 nfs3svc_encode_cookie3(resp, offset);
586
587 /* Recycle only pages that were part of the reply */
588 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
589
590 resp->status = nfsd3_map_status(status: resp->status);
591 return rpc_success;
592}
593
594/*
595 * Read a portion of a directory, including file handles and attrs.
596 * For now, we choose to ignore the dircount parameter.
597 */
598static __be32
599nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
600{
601 struct nfsd3_readdirargs *argp = rqstp->rq_argp;
602 struct nfsd3_readdirres *resp = rqstp->rq_resp;
603 loff_t offset;
604
605 trace_nfsd_vfs_readdir(rqstp, fhp: &argp->fh, count: argp->count, offset: argp->cookie);
606
607 nfsd3_init_dirlist_pages(rqstp, resp, count: argp->count);
608
609 fh_copy(dst: &resp->fh, src: &argp->fh);
610 resp->common.err = nfs_ok;
611 resp->cookie_offset = 0;
612 resp->rqstp = rqstp;
613 offset = argp->cookie;
614
615 resp->status = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
616 if (resp->status != nfs_ok)
617 goto out;
618
619 if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS) {
620 resp->status = nfserr_notsupp;
621 goto out;
622 }
623
624 resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
625 &resp->common, nfs3svc_encode_entryplus3);
626 memcpy(resp->verf, argp->verf, 8);
627 nfs3svc_encode_cookie3(resp, offset);
628
629 /* Recycle only pages that were part of the reply */
630 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
631
632out:
633 resp->status = nfsd3_map_status(status: resp->status);
634 return rpc_success;
635}
636
637/*
638 * Get file system stats
639 */
640static __be32
641nfsd3_proc_fsstat(struct svc_rqst *rqstp)
642{
643 struct nfsd_fhandle *argp = rqstp->rq_argp;
644 struct nfsd3_fsstatres *resp = rqstp->rq_resp;
645
646 resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats, access: 0);
647 fh_put(&argp->fh);
648 resp->status = nfsd3_map_status(status: resp->status);
649 return rpc_success;
650}
651
652/*
653 * Get file system info
654 */
655static __be32
656nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
657{
658 struct nfsd_fhandle *argp = rqstp->rq_argp;
659 struct nfsd3_fsinfores *resp = rqstp->rq_resp;
660 u32 max_blocksize = svc_max_payload(rqstp);
661
662 dprintk("nfsd: FSINFO(3) %s\n",
663 SVCFH_fmt(&argp->fh));
664
665 resp->f_rtmax = max_blocksize;
666 resp->f_rtpref = max_blocksize;
667 resp->f_rtmult = PAGE_SIZE;
668 resp->f_wtmax = max_blocksize;
669 resp->f_wtpref = max_blocksize;
670 resp->f_wtmult = PAGE_SIZE;
671 resp->f_dtpref = max_blocksize;
672 resp->f_maxfilesize = ~(u32) 0;
673 resp->f_properties = NFS3_FSF_DEFAULT;
674
675 resp->status = fh_verify(rqstp, &argp->fh, 0,
676 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
677
678 /* Check special features of the file system. May request
679 * different read/write sizes for file systems known to have
680 * problems with large blocks */
681 if (resp->status == nfs_ok) {
682 struct super_block *sb = argp->fh.fh_dentry->d_sb;
683
684 /* Note that we don't care for remote fs's here */
685 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
686 resp->f_properties = NFS3_FSF_BILLYBOY;
687 }
688 resp->f_maxfilesize = sb->s_maxbytes;
689 }
690
691 fh_put(&argp->fh);
692 resp->status = nfsd3_map_status(status: resp->status);
693 return rpc_success;
694}
695
696/*
697 * Get pathconf info for the specified file
698 */
699static __be32
700nfsd3_proc_pathconf(struct svc_rqst *rqstp)
701{
702 struct nfsd_fhandle *argp = rqstp->rq_argp;
703 struct nfsd3_pathconfres *resp = rqstp->rq_resp;
704
705 dprintk("nfsd: PATHCONF(3) %s\n",
706 SVCFH_fmt(&argp->fh));
707
708 /* Set default pathconf */
709 resp->p_link_max = 255; /* at least */
710 resp->p_name_max = 255; /* at least */
711 resp->p_no_trunc = 0;
712 resp->p_chown_restricted = 1;
713 resp->p_case_insensitive = 0;
714 resp->p_case_preserving = 1;
715
716 resp->status = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
717
718 if (resp->status == nfs_ok) {
719 struct super_block *sb = argp->fh.fh_dentry->d_sb;
720
721 /* Note that we don't care for remote fs's here */
722 switch (sb->s_magic) {
723 case EXT2_SUPER_MAGIC:
724 resp->p_link_max = EXT2_LINK_MAX;
725 resp->p_name_max = EXT2_NAME_LEN;
726 break;
727 case MSDOS_SUPER_MAGIC:
728 resp->p_case_insensitive = 1;
729 resp->p_case_preserving = 0;
730 break;
731 }
732 }
733
734 fh_put(&argp->fh);
735 resp->status = nfsd3_map_status(status: resp->status);
736 return rpc_success;
737}
738
739/*
740 * Commit a file (range) to stable storage.
741 */
742static __be32
743nfsd3_proc_commit(struct svc_rqst *rqstp)
744{
745 struct nfsd3_commitargs *argp = rqstp->rq_argp;
746 struct nfsd3_commitres *resp = rqstp->rq_resp;
747 struct nfsd_file *nf;
748
749 dprintk("nfsd: COMMIT(3) %s %u@%Lu\n",
750 SVCFH_fmt(&argp->fh),
751 argp->count,
752 (unsigned long long) argp->offset);
753
754 fh_copy(dst: &resp->fh, src: &argp->fh);
755 resp->status = nfsd_file_acquire_gc(rqstp, fhp: &resp->fh, NFSD_MAY_WRITE |
756 NFSD_MAY_NOT_BREAK_LEASE, nfp: &nf);
757 if (resp->status)
758 goto out;
759 resp->status = nfsd_commit(rqst: rqstp, fhp: &resp->fh, nf, offset: argp->offset,
760 count: argp->count, verf: resp->verf);
761 nfsd_file_put(nf);
762out:
763 resp->status = nfsd3_map_status(status: resp->status);
764 return rpc_success;
765}
766
767
768/*
769 * NFSv3 Server procedures.
770 * Only the results of non-idempotent operations are cached.
771 */
772#define nfs3svc_encode_attrstatres nfs3svc_encode_attrstat
773#define nfs3svc_encode_wccstatres nfs3svc_encode_wccstat
774#define nfsd3_mkdirargs nfsd3_createargs
775#define nfsd3_readdirplusargs nfsd3_readdirargs
776#define nfsd3_fhandleargs nfsd_fhandle
777#define nfsd3_attrstatres nfsd3_attrstat
778#define nfsd3_wccstatres nfsd3_attrstat
779#define nfsd3_createres nfsd3_diropres
780
781#define ST 1 /* status*/
782#define FH 17 /* filehandle with length */
783#define AT 21 /* attributes */
784#define pAT (1+AT) /* post attributes - conditional */
785#define WC (7+pAT) /* WCC attributes */
786
787static const struct svc_procedure nfsd_procedures3[22] = {
788 [NFS3PROC_NULL] = {
789 .pc_func = nfsd3_proc_null,
790 .pc_decode = nfssvc_decode_voidarg,
791 .pc_encode = nfssvc_encode_voidres,
792 .pc_argsize = sizeof(struct nfsd_voidargs),
793 .pc_argzero = sizeof(struct nfsd_voidargs),
794 .pc_ressize = sizeof(struct nfsd_voidres),
795 .pc_cachetype = RC_NOCACHE,
796 .pc_xdrressize = ST,
797 .pc_name = "NULL",
798 },
799 [NFS3PROC_GETATTR] = {
800 .pc_func = nfsd3_proc_getattr,
801 .pc_decode = nfs3svc_decode_fhandleargs,
802 .pc_encode = nfs3svc_encode_getattrres,
803 .pc_release = nfs3svc_release_fhandle,
804 .pc_argsize = sizeof(struct nfsd_fhandle),
805 .pc_argzero = sizeof(struct nfsd_fhandle),
806 .pc_ressize = sizeof(struct nfsd3_attrstatres),
807 .pc_cachetype = RC_NOCACHE,
808 .pc_xdrressize = ST+AT,
809 .pc_name = "GETATTR",
810 },
811 [NFS3PROC_SETATTR] = {
812 .pc_func = nfsd3_proc_setattr,
813 .pc_decode = nfs3svc_decode_sattrargs,
814 .pc_encode = nfs3svc_encode_wccstatres,
815 .pc_release = nfs3svc_release_fhandle,
816 .pc_argsize = sizeof(struct nfsd3_sattrargs),
817 .pc_argzero = sizeof(struct nfsd3_sattrargs),
818 .pc_ressize = sizeof(struct nfsd3_wccstatres),
819 .pc_cachetype = RC_REPLBUFF,
820 .pc_xdrressize = ST+WC,
821 .pc_name = "SETATTR",
822 },
823 [NFS3PROC_LOOKUP] = {
824 .pc_func = nfsd3_proc_lookup,
825 .pc_decode = nfs3svc_decode_diropargs,
826 .pc_encode = nfs3svc_encode_lookupres,
827 .pc_release = nfs3svc_release_fhandle2,
828 .pc_argsize = sizeof(struct nfsd3_diropargs),
829 .pc_argzero = sizeof(struct nfsd3_diropargs),
830 .pc_ressize = sizeof(struct nfsd3_diropres),
831 .pc_cachetype = RC_NOCACHE,
832 .pc_xdrressize = ST+FH+pAT+pAT,
833 .pc_name = "LOOKUP",
834 },
835 [NFS3PROC_ACCESS] = {
836 .pc_func = nfsd3_proc_access,
837 .pc_decode = nfs3svc_decode_accessargs,
838 .pc_encode = nfs3svc_encode_accessres,
839 .pc_release = nfs3svc_release_fhandle,
840 .pc_argsize = sizeof(struct nfsd3_accessargs),
841 .pc_argzero = sizeof(struct nfsd3_accessargs),
842 .pc_ressize = sizeof(struct nfsd3_accessres),
843 .pc_cachetype = RC_NOCACHE,
844 .pc_xdrressize = ST+pAT+1,
845 .pc_name = "ACCESS",
846 },
847 [NFS3PROC_READLINK] = {
848 .pc_func = nfsd3_proc_readlink,
849 .pc_decode = nfs3svc_decode_fhandleargs,
850 .pc_encode = nfs3svc_encode_readlinkres,
851 .pc_release = nfs3svc_release_fhandle,
852 .pc_argsize = sizeof(struct nfsd_fhandle),
853 .pc_argzero = sizeof(struct nfsd_fhandle),
854 .pc_ressize = sizeof(struct nfsd3_readlinkres),
855 .pc_cachetype = RC_NOCACHE,
856 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
857 .pc_name = "READLINK",
858 },
859 [NFS3PROC_READ] = {
860 .pc_func = nfsd3_proc_read,
861 .pc_decode = nfs3svc_decode_readargs,
862 .pc_encode = nfs3svc_encode_readres,
863 .pc_release = nfs3svc_release_fhandle,
864 .pc_argsize = sizeof(struct nfsd3_readargs),
865 .pc_argzero = sizeof(struct nfsd3_readargs),
866 .pc_ressize = sizeof(struct nfsd3_readres),
867 .pc_cachetype = RC_NOCACHE,
868 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
869 .pc_name = "READ",
870 },
871 [NFS3PROC_WRITE] = {
872 .pc_func = nfsd3_proc_write,
873 .pc_decode = nfs3svc_decode_writeargs,
874 .pc_encode = nfs3svc_encode_writeres,
875 .pc_release = nfs3svc_release_fhandle,
876 .pc_argsize = sizeof(struct nfsd3_writeargs),
877 .pc_argzero = sizeof(struct nfsd3_writeargs),
878 .pc_ressize = sizeof(struct nfsd3_writeres),
879 .pc_cachetype = RC_REPLBUFF,
880 .pc_xdrressize = ST+WC+4,
881 .pc_name = "WRITE",
882 },
883 [NFS3PROC_CREATE] = {
884 .pc_func = nfsd3_proc_create,
885 .pc_decode = nfs3svc_decode_createargs,
886 .pc_encode = nfs3svc_encode_createres,
887 .pc_release = nfs3svc_release_fhandle2,
888 .pc_argsize = sizeof(struct nfsd3_createargs),
889 .pc_argzero = sizeof(struct nfsd3_createargs),
890 .pc_ressize = sizeof(struct nfsd3_createres),
891 .pc_cachetype = RC_REPLBUFF,
892 .pc_xdrressize = ST+(1+FH+pAT)+WC,
893 .pc_name = "CREATE",
894 },
895 [NFS3PROC_MKDIR] = {
896 .pc_func = nfsd3_proc_mkdir,
897 .pc_decode = nfs3svc_decode_mkdirargs,
898 .pc_encode = nfs3svc_encode_createres,
899 .pc_release = nfs3svc_release_fhandle2,
900 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
901 .pc_argzero = sizeof(struct nfsd3_mkdirargs),
902 .pc_ressize = sizeof(struct nfsd3_createres),
903 .pc_cachetype = RC_REPLBUFF,
904 .pc_xdrressize = ST+(1+FH+pAT)+WC,
905 .pc_name = "MKDIR",
906 },
907 [NFS3PROC_SYMLINK] = {
908 .pc_func = nfsd3_proc_symlink,
909 .pc_decode = nfs3svc_decode_symlinkargs,
910 .pc_encode = nfs3svc_encode_createres,
911 .pc_release = nfs3svc_release_fhandle2,
912 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
913 .pc_argzero = sizeof(struct nfsd3_symlinkargs),
914 .pc_ressize = sizeof(struct nfsd3_createres),
915 .pc_cachetype = RC_REPLBUFF,
916 .pc_xdrressize = ST+(1+FH+pAT)+WC,
917 .pc_name = "SYMLINK",
918 },
919 [NFS3PROC_MKNOD] = {
920 .pc_func = nfsd3_proc_mknod,
921 .pc_decode = nfs3svc_decode_mknodargs,
922 .pc_encode = nfs3svc_encode_createres,
923 .pc_release = nfs3svc_release_fhandle2,
924 .pc_argsize = sizeof(struct nfsd3_mknodargs),
925 .pc_argzero = sizeof(struct nfsd3_mknodargs),
926 .pc_ressize = sizeof(struct nfsd3_createres),
927 .pc_cachetype = RC_REPLBUFF,
928 .pc_xdrressize = ST+(1+FH+pAT)+WC,
929 .pc_name = "MKNOD",
930 },
931 [NFS3PROC_REMOVE] = {
932 .pc_func = nfsd3_proc_remove,
933 .pc_decode = nfs3svc_decode_diropargs,
934 .pc_encode = nfs3svc_encode_wccstatres,
935 .pc_release = nfs3svc_release_fhandle,
936 .pc_argsize = sizeof(struct nfsd3_diropargs),
937 .pc_argzero = sizeof(struct nfsd3_diropargs),
938 .pc_ressize = sizeof(struct nfsd3_wccstatres),
939 .pc_cachetype = RC_REPLBUFF,
940 .pc_xdrressize = ST+WC,
941 .pc_name = "REMOVE",
942 },
943 [NFS3PROC_RMDIR] = {
944 .pc_func = nfsd3_proc_rmdir,
945 .pc_decode = nfs3svc_decode_diropargs,
946 .pc_encode = nfs3svc_encode_wccstatres,
947 .pc_release = nfs3svc_release_fhandle,
948 .pc_argsize = sizeof(struct nfsd3_diropargs),
949 .pc_argzero = sizeof(struct nfsd3_diropargs),
950 .pc_ressize = sizeof(struct nfsd3_wccstatres),
951 .pc_cachetype = RC_REPLBUFF,
952 .pc_xdrressize = ST+WC,
953 .pc_name = "RMDIR",
954 },
955 [NFS3PROC_RENAME] = {
956 .pc_func = nfsd3_proc_rename,
957 .pc_decode = nfs3svc_decode_renameargs,
958 .pc_encode = nfs3svc_encode_renameres,
959 .pc_release = nfs3svc_release_fhandle2,
960 .pc_argsize = sizeof(struct nfsd3_renameargs),
961 .pc_argzero = sizeof(struct nfsd3_renameargs),
962 .pc_ressize = sizeof(struct nfsd3_renameres),
963 .pc_cachetype = RC_REPLBUFF,
964 .pc_xdrressize = ST+WC+WC,
965 .pc_name = "RENAME",
966 },
967 [NFS3PROC_LINK] = {
968 .pc_func = nfsd3_proc_link,
969 .pc_decode = nfs3svc_decode_linkargs,
970 .pc_encode = nfs3svc_encode_linkres,
971 .pc_release = nfs3svc_release_fhandle2,
972 .pc_argsize = sizeof(struct nfsd3_linkargs),
973 .pc_argzero = sizeof(struct nfsd3_linkargs),
974 .pc_ressize = sizeof(struct nfsd3_linkres),
975 .pc_cachetype = RC_REPLBUFF,
976 .pc_xdrressize = ST+pAT+WC,
977 .pc_name = "LINK",
978 },
979 [NFS3PROC_READDIR] = {
980 .pc_func = nfsd3_proc_readdir,
981 .pc_decode = nfs3svc_decode_readdirargs,
982 .pc_encode = nfs3svc_encode_readdirres,
983 .pc_release = nfs3svc_release_fhandle,
984 .pc_argsize = sizeof(struct nfsd3_readdirargs),
985 .pc_argzero = sizeof(struct nfsd3_readdirargs),
986 .pc_ressize = sizeof(struct nfsd3_readdirres),
987 .pc_cachetype = RC_NOCACHE,
988 .pc_name = "READDIR",
989 },
990 [NFS3PROC_READDIRPLUS] = {
991 .pc_func = nfsd3_proc_readdirplus,
992 .pc_decode = nfs3svc_decode_readdirplusargs,
993 .pc_encode = nfs3svc_encode_readdirres,
994 .pc_release = nfs3svc_release_fhandle,
995 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
996 .pc_argzero = sizeof(struct nfsd3_readdirplusargs),
997 .pc_ressize = sizeof(struct nfsd3_readdirres),
998 .pc_cachetype = RC_NOCACHE,
999 .pc_name = "READDIRPLUS",
1000 },
1001 [NFS3PROC_FSSTAT] = {
1002 .pc_func = nfsd3_proc_fsstat,
1003 .pc_decode = nfs3svc_decode_fhandleargs,
1004 .pc_encode = nfs3svc_encode_fsstatres,
1005 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
1006 .pc_argzero = sizeof(struct nfsd3_fhandleargs),
1007 .pc_ressize = sizeof(struct nfsd3_fsstatres),
1008 .pc_cachetype = RC_NOCACHE,
1009 .pc_xdrressize = ST+pAT+2*6+1,
1010 .pc_name = "FSSTAT",
1011 },
1012 [NFS3PROC_FSINFO] = {
1013 .pc_func = nfsd3_proc_fsinfo,
1014 .pc_decode = nfs3svc_decode_fhandleargs,
1015 .pc_encode = nfs3svc_encode_fsinfores,
1016 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
1017 .pc_argzero = sizeof(struct nfsd3_fhandleargs),
1018 .pc_ressize = sizeof(struct nfsd3_fsinfores),
1019 .pc_cachetype = RC_NOCACHE,
1020 .pc_xdrressize = ST+pAT+12,
1021 .pc_name = "FSINFO",
1022 },
1023 [NFS3PROC_PATHCONF] = {
1024 .pc_func = nfsd3_proc_pathconf,
1025 .pc_decode = nfs3svc_decode_fhandleargs,
1026 .pc_encode = nfs3svc_encode_pathconfres,
1027 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
1028 .pc_argzero = sizeof(struct nfsd3_fhandleargs),
1029 .pc_ressize = sizeof(struct nfsd3_pathconfres),
1030 .pc_cachetype = RC_NOCACHE,
1031 .pc_xdrressize = ST+pAT+6,
1032 .pc_name = "PATHCONF",
1033 },
1034 [NFS3PROC_COMMIT] = {
1035 .pc_func = nfsd3_proc_commit,
1036 .pc_decode = nfs3svc_decode_commitargs,
1037 .pc_encode = nfs3svc_encode_commitres,
1038 .pc_release = nfs3svc_release_fhandle,
1039 .pc_argsize = sizeof(struct nfsd3_commitargs),
1040 .pc_argzero = sizeof(struct nfsd3_commitargs),
1041 .pc_ressize = sizeof(struct nfsd3_commitres),
1042 .pc_cachetype = RC_NOCACHE,
1043 .pc_xdrressize = ST+WC+2,
1044 .pc_name = "COMMIT",
1045 },
1046};
1047
1048static DEFINE_PER_CPU_ALIGNED(unsigned long,
1049 nfsd_count3[ARRAY_SIZE(nfsd_procedures3)]);
1050const struct svc_version nfsd_version3 = {
1051 .vs_vers = 3,
1052 .vs_nproc = ARRAY_SIZE(nfsd_procedures3),
1053 .vs_proc = nfsd_procedures3,
1054 .vs_dispatch = nfsd_dispatch,
1055 .vs_count = nfsd_count3,
1056 .vs_xdrsize = NFS3_SVC_XDRSIZE,
1057};
1058

source code of linux/fs/nfsd/nfs3proc.c