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Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6
[deliverable/linux.git] / fs / nfsd / nfsctl.c
1 /*
2 * Syscall interface to knfsd.
3 *
4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
5 */
6
7 #include <linux/namei.h>
8 #include <linux/ctype.h>
9
10 #include <linux/nfsd_idmap.h>
11 #include <linux/sunrpc/svcsock.h>
12 #include <linux/nfsd/syscall.h>
13 #include <linux/lockd/lockd.h>
14 #include <linux/sunrpc/clnt.h>
15
16 #include "nfsd.h"
17 #include "cache.h"
18
19 /*
20 * We have a single directory with 9 nodes in it.
21 */
22 enum {
23 NFSD_Root = 1,
24 NFSD_Svc,
25 NFSD_Add,
26 NFSD_Del,
27 NFSD_Export,
28 NFSD_Unexport,
29 NFSD_Getfd,
30 NFSD_Getfs,
31 NFSD_List,
32 NFSD_Export_features,
33 NFSD_Fh,
34 NFSD_FO_UnlockIP,
35 NFSD_FO_UnlockFS,
36 NFSD_Threads,
37 NFSD_Pool_Threads,
38 NFSD_Pool_Stats,
39 NFSD_Versions,
40 NFSD_Ports,
41 NFSD_MaxBlkSize,
42 /*
43 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
44 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
45 */
46 #ifdef CONFIG_NFSD_V4
47 NFSD_Leasetime,
48 NFSD_RecoveryDir,
49 #endif
50 };
51
52 /*
53 * write() for these nodes.
54 */
55 static ssize_t write_svc(struct file *file, char *buf, size_t size);
56 static ssize_t write_add(struct file *file, char *buf, size_t size);
57 static ssize_t write_del(struct file *file, char *buf, size_t size);
58 static ssize_t write_export(struct file *file, char *buf, size_t size);
59 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
60 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
61 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
62 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
63 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
64 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
65 static ssize_t write_threads(struct file *file, char *buf, size_t size);
66 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
67 static ssize_t write_versions(struct file *file, char *buf, size_t size);
68 static ssize_t write_ports(struct file *file, char *buf, size_t size);
69 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
70 #ifdef CONFIG_NFSD_V4
71 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
72 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
73 #endif
74
75 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
76 [NFSD_Svc] = write_svc,
77 [NFSD_Add] = write_add,
78 [NFSD_Del] = write_del,
79 [NFSD_Export] = write_export,
80 [NFSD_Unexport] = write_unexport,
81 [NFSD_Getfd] = write_getfd,
82 [NFSD_Getfs] = write_getfs,
83 [NFSD_Fh] = write_filehandle,
84 [NFSD_FO_UnlockIP] = write_unlock_ip,
85 [NFSD_FO_UnlockFS] = write_unlock_fs,
86 [NFSD_Threads] = write_threads,
87 [NFSD_Pool_Threads] = write_pool_threads,
88 [NFSD_Versions] = write_versions,
89 [NFSD_Ports] = write_ports,
90 [NFSD_MaxBlkSize] = write_maxblksize,
91 #ifdef CONFIG_NFSD_V4
92 [NFSD_Leasetime] = write_leasetime,
93 [NFSD_RecoveryDir] = write_recoverydir,
94 #endif
95 };
96
97 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
98 {
99 ino_t ino = file->f_path.dentry->d_inode->i_ino;
100 char *data;
101 ssize_t rv;
102
103 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
104 return -EINVAL;
105
106 data = simple_transaction_get(file, buf, size);
107 if (IS_ERR(data))
108 return PTR_ERR(data);
109
110 rv = write_op[ino](file, data, size);
111 if (rv >= 0) {
112 simple_transaction_set(file, rv);
113 rv = size;
114 }
115 return rv;
116 }
117
118 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
119 {
120 if (! file->private_data) {
121 /* An attempt to read a transaction file without writing
122 * causes a 0-byte write so that the file can return
123 * state information
124 */
125 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
126 if (rv < 0)
127 return rv;
128 }
129 return simple_transaction_read(file, buf, size, pos);
130 }
131
132 static const struct file_operations transaction_ops = {
133 .write = nfsctl_transaction_write,
134 .read = nfsctl_transaction_read,
135 .release = simple_transaction_release,
136 };
137
138 static int exports_open(struct inode *inode, struct file *file)
139 {
140 return seq_open(file, &nfs_exports_op);
141 }
142
143 static const struct file_operations exports_operations = {
144 .open = exports_open,
145 .read = seq_read,
146 .llseek = seq_lseek,
147 .release = seq_release,
148 .owner = THIS_MODULE,
149 };
150
151 static int export_features_show(struct seq_file *m, void *v)
152 {
153 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
154 return 0;
155 }
156
157 static int export_features_open(struct inode *inode, struct file *file)
158 {
159 return single_open(file, export_features_show, NULL);
160 }
161
162 static struct file_operations export_features_operations = {
163 .open = export_features_open,
164 .read = seq_read,
165 .llseek = seq_lseek,
166 .release = single_release,
167 };
168
169 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
170 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
171
172 static const struct file_operations pool_stats_operations = {
173 .open = nfsd_pool_stats_open,
174 .read = seq_read,
175 .llseek = seq_lseek,
176 .release = nfsd_pool_stats_release,
177 .owner = THIS_MODULE,
178 };
179
180 /*----------------------------------------------------------------------------*/
181 /*
182 * payload - write methods
183 */
184
185 /**
186 * write_svc - Start kernel's NFSD server
187 *
188 * Deprecated. /proc/fs/nfsd/threads is preferred.
189 * Function remains to support old versions of nfs-utils.
190 *
191 * Input:
192 * buf: struct nfsctl_svc
193 * svc_port: port number of this
194 * server's listener
195 * svc_nthreads: number of threads to start
196 * size: size in bytes of passed in nfsctl_svc
197 * Output:
198 * On success: returns zero
199 * On error: return code is negative errno value
200 */
201 static ssize_t write_svc(struct file *file, char *buf, size_t size)
202 {
203 struct nfsctl_svc *data;
204 int err;
205 if (size < sizeof(*data))
206 return -EINVAL;
207 data = (struct nfsctl_svc*) buf;
208 err = nfsd_svc(data->svc_port, data->svc_nthreads);
209 if (err < 0)
210 return err;
211 return 0;
212 }
213
214 /**
215 * write_add - Add or modify client entry in auth unix cache
216 *
217 * Deprecated. /proc/net/rpc/auth.unix.ip is preferred.
218 * Function remains to support old versions of nfs-utils.
219 *
220 * Input:
221 * buf: struct nfsctl_client
222 * cl_ident: '\0'-terminated C string
223 * containing domain name
224 * of client
225 * cl_naddr: no. of items in cl_addrlist
226 * cl_addrlist: array of client addresses
227 * cl_fhkeytype: ignored
228 * cl_fhkeylen: ignored
229 * cl_fhkey: ignored
230 * size: size in bytes of passed in nfsctl_client
231 * Output:
232 * On success: returns zero
233 * On error: return code is negative errno value
234 *
235 * Note: Only AF_INET client addresses are passed in, since
236 * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
237 */
238 static ssize_t write_add(struct file *file, char *buf, size_t size)
239 {
240 struct nfsctl_client *data;
241 if (size < sizeof(*data))
242 return -EINVAL;
243 data = (struct nfsctl_client *)buf;
244 return exp_addclient(data);
245 }
246
247 /**
248 * write_del - Remove client from auth unix cache
249 *
250 * Deprecated. /proc/net/rpc/auth.unix.ip is preferred.
251 * Function remains to support old versions of nfs-utils.
252 *
253 * Input:
254 * buf: struct nfsctl_client
255 * cl_ident: '\0'-terminated C string
256 * containing domain name
257 * of client
258 * cl_naddr: ignored
259 * cl_addrlist: ignored
260 * cl_fhkeytype: ignored
261 * cl_fhkeylen: ignored
262 * cl_fhkey: ignored
263 * size: size in bytes of passed in nfsctl_client
264 * Output:
265 * On success: returns zero
266 * On error: return code is negative errno value
267 *
268 * Note: Only AF_INET client addresses are passed in, since
269 * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
270 */
271 static ssize_t write_del(struct file *file, char *buf, size_t size)
272 {
273 struct nfsctl_client *data;
274 if (size < sizeof(*data))
275 return -EINVAL;
276 data = (struct nfsctl_client *)buf;
277 return exp_delclient(data);
278 }
279
280 /**
281 * write_export - Export part or all of a local file system
282 *
283 * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
284 * Function remains to support old versions of nfs-utils.
285 *
286 * Input:
287 * buf: struct nfsctl_export
288 * ex_client: '\0'-terminated C string
289 * containing domain name
290 * of client allowed to access
291 * this export
292 * ex_path: '\0'-terminated C string
293 * containing pathname of
294 * directory in local file system
295 * ex_dev: fsid to use for this export
296 * ex_ino: ignored
297 * ex_flags: export flags for this export
298 * ex_anon_uid: UID to use for anonymous
299 * requests
300 * ex_anon_gid: GID to use for anonymous
301 * requests
302 * size: size in bytes of passed in nfsctl_export
303 * Output:
304 * On success: returns zero
305 * On error: return code is negative errno value
306 */
307 static ssize_t write_export(struct file *file, char *buf, size_t size)
308 {
309 struct nfsctl_export *data;
310 if (size < sizeof(*data))
311 return -EINVAL;
312 data = (struct nfsctl_export*)buf;
313 return exp_export(data);
314 }
315
316 /**
317 * write_unexport - Unexport a previously exported file system
318 *
319 * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
320 * Function remains to support old versions of nfs-utils.
321 *
322 * Input:
323 * buf: struct nfsctl_export
324 * ex_client: '\0'-terminated C string
325 * containing domain name
326 * of client no longer allowed
327 * to access this export
328 * ex_path: '\0'-terminated C string
329 * containing pathname of
330 * directory in local file system
331 * ex_dev: ignored
332 * ex_ino: ignored
333 * ex_flags: ignored
334 * ex_anon_uid: ignored
335 * ex_anon_gid: ignored
336 * size: size in bytes of passed in nfsctl_export
337 * Output:
338 * On success: returns zero
339 * On error: return code is negative errno value
340 */
341 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
342 {
343 struct nfsctl_export *data;
344
345 if (size < sizeof(*data))
346 return -EINVAL;
347 data = (struct nfsctl_export*)buf;
348 return exp_unexport(data);
349 }
350
351 /**
352 * write_getfs - Get a variable-length NFS file handle by path
353 *
354 * Deprecated. /proc/fs/nfsd/filehandle is preferred.
355 * Function remains to support old versions of nfs-utils.
356 *
357 * Input:
358 * buf: struct nfsctl_fsparm
359 * gd_addr: socket address of client
360 * gd_path: '\0'-terminated C string
361 * containing pathname of
362 * directory in local file system
363 * gd_maxlen: maximum size of returned file
364 * handle
365 * size: size in bytes of passed in nfsctl_fsparm
366 * Output:
367 * On success: passed-in buffer filled with a knfsd_fh structure
368 * (a variable-length raw NFS file handle);
369 * return code is the size in bytes of the file handle
370 * On error: return code is negative errno value
371 *
372 * Note: Only AF_INET client addresses are passed in, since gd_addr
373 * is the same size as a struct sockaddr_in.
374 */
375 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
376 {
377 struct nfsctl_fsparm *data;
378 struct sockaddr_in *sin;
379 struct auth_domain *clp;
380 int err = 0;
381 struct knfsd_fh *res;
382 struct in6_addr in6;
383
384 if (size < sizeof(*data))
385 return -EINVAL;
386 data = (struct nfsctl_fsparm*)buf;
387 err = -EPROTONOSUPPORT;
388 if (data->gd_addr.sa_family != AF_INET)
389 goto out;
390 sin = (struct sockaddr_in *)&data->gd_addr;
391 if (data->gd_maxlen > NFS3_FHSIZE)
392 data->gd_maxlen = NFS3_FHSIZE;
393
394 res = (struct knfsd_fh*)buf;
395
396 exp_readlock();
397
398 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
399
400 clp = auth_unix_lookup(&in6);
401 if (!clp)
402 err = -EPERM;
403 else {
404 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
405 auth_domain_put(clp);
406 }
407 exp_readunlock();
408 if (err == 0)
409 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
410 out:
411 return err;
412 }
413
414 /**
415 * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
416 *
417 * Deprecated. /proc/fs/nfsd/filehandle is preferred.
418 * Function remains to support old versions of nfs-utils.
419 *
420 * Input:
421 * buf: struct nfsctl_fdparm
422 * gd_addr: socket address of client
423 * gd_path: '\0'-terminated C string
424 * containing pathname of
425 * directory in local file system
426 * gd_version: fdparm structure version
427 * size: size in bytes of passed in nfsctl_fdparm
428 * Output:
429 * On success: passed-in buffer filled with nfsctl_res
430 * (a fixed-length raw NFS file handle);
431 * return code is the size in bytes of the file handle
432 * On error: return code is negative errno value
433 *
434 * Note: Only AF_INET client addresses are passed in, since gd_addr
435 * is the same size as a struct sockaddr_in.
436 */
437 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
438 {
439 struct nfsctl_fdparm *data;
440 struct sockaddr_in *sin;
441 struct auth_domain *clp;
442 int err = 0;
443 struct knfsd_fh fh;
444 char *res;
445 struct in6_addr in6;
446
447 if (size < sizeof(*data))
448 return -EINVAL;
449 data = (struct nfsctl_fdparm*)buf;
450 err = -EPROTONOSUPPORT;
451 if (data->gd_addr.sa_family != AF_INET)
452 goto out;
453 err = -EINVAL;
454 if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
455 goto out;
456
457 res = buf;
458 sin = (struct sockaddr_in *)&data->gd_addr;
459 exp_readlock();
460
461 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
462
463 clp = auth_unix_lookup(&in6);
464 if (!clp)
465 err = -EPERM;
466 else {
467 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
468 auth_domain_put(clp);
469 }
470 exp_readunlock();
471
472 if (err == 0) {
473 memset(res,0, NFS_FHSIZE);
474 memcpy(res, &fh.fh_base, fh.fh_size);
475 err = NFS_FHSIZE;
476 }
477 out:
478 return err;
479 }
480
481 /**
482 * write_unlock_ip - Release all locks used by a client
483 *
484 * Experimental.
485 *
486 * Input:
487 * buf: '\n'-terminated C string containing a
488 * presentation format IP address
489 * size: length of C string in @buf
490 * Output:
491 * On success: returns zero if all specified locks were released;
492 * returns one if one or more locks were not released
493 * On error: return code is negative errno value
494 */
495 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
496 {
497 struct sockaddr_storage address;
498 struct sockaddr *sap = (struct sockaddr *)&address;
499 size_t salen = sizeof(address);
500 char *fo_path;
501
502 /* sanity check */
503 if (size == 0)
504 return -EINVAL;
505
506 if (buf[size-1] != '\n')
507 return -EINVAL;
508
509 fo_path = buf;
510 if (qword_get(&buf, fo_path, size) < 0)
511 return -EINVAL;
512
513 if (rpc_pton(fo_path, size, sap, salen) == 0)
514 return -EINVAL;
515
516 return nlmsvc_unlock_all_by_ip(sap);
517 }
518
519 /**
520 * write_unlock_fs - Release all locks on a local file system
521 *
522 * Experimental.
523 *
524 * Input:
525 * buf: '\n'-terminated C string containing the
526 * absolute pathname of a local file system
527 * size: length of C string in @buf
528 * Output:
529 * On success: returns zero if all specified locks were released;
530 * returns one if one or more locks were not released
531 * On error: return code is negative errno value
532 */
533 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
534 {
535 struct path path;
536 char *fo_path;
537 int error;
538
539 /* sanity check */
540 if (size == 0)
541 return -EINVAL;
542
543 if (buf[size-1] != '\n')
544 return -EINVAL;
545
546 fo_path = buf;
547 if (qword_get(&buf, fo_path, size) < 0)
548 return -EINVAL;
549
550 error = kern_path(fo_path, 0, &path);
551 if (error)
552 return error;
553
554 /*
555 * XXX: Needs better sanity checking. Otherwise we could end up
556 * releasing locks on the wrong file system.
557 *
558 * For example:
559 * 1. Does the path refer to a directory?
560 * 2. Is that directory a mount point, or
561 * 3. Is that directory the root of an exported file system?
562 */
563 error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
564
565 path_put(&path);
566 return error;
567 }
568
569 /**
570 * write_filehandle - Get a variable-length NFS file handle by path
571 *
572 * On input, the buffer contains a '\n'-terminated C string comprised of
573 * three alphanumeric words separated by whitespace. The string may
574 * contain escape sequences.
575 *
576 * Input:
577 * buf:
578 * domain: client domain name
579 * path: export pathname
580 * maxsize: numeric maximum size of
581 * @buf
582 * size: length of C string in @buf
583 * Output:
584 * On success: passed-in buffer filled with '\n'-terminated C
585 * string containing a ASCII hex text version
586 * of the NFS file handle;
587 * return code is the size in bytes of the string
588 * On error: return code is negative errno value
589 */
590 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
591 {
592 char *dname, *path;
593 int uninitialized_var(maxsize);
594 char *mesg = buf;
595 int len;
596 struct auth_domain *dom;
597 struct knfsd_fh fh;
598
599 if (size == 0)
600 return -EINVAL;
601
602 if (buf[size-1] != '\n')
603 return -EINVAL;
604 buf[size-1] = 0;
605
606 dname = mesg;
607 len = qword_get(&mesg, dname, size);
608 if (len <= 0)
609 return -EINVAL;
610
611 path = dname+len+1;
612 len = qword_get(&mesg, path, size);
613 if (len <= 0)
614 return -EINVAL;
615
616 len = get_int(&mesg, &maxsize);
617 if (len)
618 return len;
619
620 if (maxsize < NFS_FHSIZE)
621 return -EINVAL;
622 if (maxsize > NFS3_FHSIZE)
623 maxsize = NFS3_FHSIZE;
624
625 if (qword_get(&mesg, mesg, size)>0)
626 return -EINVAL;
627
628 /* we have all the words, they are in buf.. */
629 dom = unix_domain_find(dname);
630 if (!dom)
631 return -ENOMEM;
632
633 len = exp_rootfh(dom, path, &fh, maxsize);
634 auth_domain_put(dom);
635 if (len)
636 return len;
637
638 mesg = buf;
639 len = SIMPLE_TRANSACTION_LIMIT;
640 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
641 mesg[-1] = '\n';
642 return mesg - buf;
643 }
644
645 /**
646 * write_threads - Start NFSD, or report the current number of running threads
647 *
648 * Input:
649 * buf: ignored
650 * size: zero
651 * Output:
652 * On success: passed-in buffer filled with '\n'-terminated C
653 * string numeric value representing the number of
654 * running NFSD threads;
655 * return code is the size in bytes of the string
656 * On error: return code is zero
657 *
658 * OR
659 *
660 * Input:
661 * buf: C string containing an unsigned
662 * integer value representing the
663 * number of NFSD threads to start
664 * size: non-zero length of C string in @buf
665 * Output:
666 * On success: NFS service is started;
667 * passed-in buffer filled with '\n'-terminated C
668 * string numeric value representing the number of
669 * running NFSD threads;
670 * return code is the size in bytes of the string
671 * On error: return code is zero or a negative errno value
672 */
673 static ssize_t write_threads(struct file *file, char *buf, size_t size)
674 {
675 char *mesg = buf;
676 int rv;
677 if (size > 0) {
678 int newthreads;
679 rv = get_int(&mesg, &newthreads);
680 if (rv)
681 return rv;
682 if (newthreads < 0)
683 return -EINVAL;
684 rv = nfsd_svc(NFS_PORT, newthreads);
685 if (rv < 0)
686 return rv;
687 } else
688 rv = nfsd_nrthreads();
689
690 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
691 }
692
693 /**
694 * write_pool_threads - Set or report the current number of threads per pool
695 *
696 * Input:
697 * buf: ignored
698 * size: zero
699 *
700 * OR
701 *
702 * Input:
703 * buf: C string containing whitespace-
704 * separated unsigned integer values
705 * representing the number of NFSD
706 * threads to start in each pool
707 * size: non-zero length of C string in @buf
708 * Output:
709 * On success: passed-in buffer filled with '\n'-terminated C
710 * string containing integer values representing the
711 * number of NFSD threads in each pool;
712 * return code is the size in bytes of the string
713 * On error: return code is zero or a negative errno value
714 */
715 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
716 {
717 /* if size > 0, look for an array of number of threads per node
718 * and apply them then write out number of threads per node as reply
719 */
720 char *mesg = buf;
721 int i;
722 int rv;
723 int len;
724 int npools;
725 int *nthreads;
726
727 mutex_lock(&nfsd_mutex);
728 npools = nfsd_nrpools();
729 if (npools == 0) {
730 /*
731 * NFS is shut down. The admin can start it by
732 * writing to the threads file but NOT the pool_threads
733 * file, sorry. Report zero threads.
734 */
735 mutex_unlock(&nfsd_mutex);
736 strcpy(buf, "0\n");
737 return strlen(buf);
738 }
739
740 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
741 rv = -ENOMEM;
742 if (nthreads == NULL)
743 goto out_free;
744
745 if (size > 0) {
746 for (i = 0; i < npools; i++) {
747 rv = get_int(&mesg, &nthreads[i]);
748 if (rv == -ENOENT)
749 break; /* fewer numbers than pools */
750 if (rv)
751 goto out_free; /* syntax error */
752 rv = -EINVAL;
753 if (nthreads[i] < 0)
754 goto out_free;
755 }
756 rv = nfsd_set_nrthreads(i, nthreads);
757 if (rv)
758 goto out_free;
759 }
760
761 rv = nfsd_get_nrthreads(npools, nthreads);
762 if (rv)
763 goto out_free;
764
765 mesg = buf;
766 size = SIMPLE_TRANSACTION_LIMIT;
767 for (i = 0; i < npools && size > 0; i++) {
768 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
769 len = strlen(mesg);
770 size -= len;
771 mesg += len;
772 }
773 rv = mesg - buf;
774 out_free:
775 kfree(nthreads);
776 mutex_unlock(&nfsd_mutex);
777 return rv;
778 }
779
780 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
781 {
782 char *mesg = buf;
783 char *vers, *minorp, sign;
784 int len, num, remaining;
785 unsigned minor;
786 ssize_t tlen = 0;
787 char *sep;
788
789 if (size>0) {
790 if (nfsd_serv)
791 /* Cannot change versions without updating
792 * nfsd_serv->sv_xdrsize, and reallocing
793 * rq_argp and rq_resp
794 */
795 return -EBUSY;
796 if (buf[size-1] != '\n')
797 return -EINVAL;
798 buf[size-1] = 0;
799
800 vers = mesg;
801 len = qword_get(&mesg, vers, size);
802 if (len <= 0) return -EINVAL;
803 do {
804 sign = *vers;
805 if (sign == '+' || sign == '-')
806 num = simple_strtol((vers+1), &minorp, 0);
807 else
808 num = simple_strtol(vers, &minorp, 0);
809 if (*minorp == '.') {
810 if (num < 4)
811 return -EINVAL;
812 minor = simple_strtoul(minorp+1, NULL, 0);
813 if (minor == 0)
814 return -EINVAL;
815 if (nfsd_minorversion(minor, sign == '-' ?
816 NFSD_CLEAR : NFSD_SET) < 0)
817 return -EINVAL;
818 goto next;
819 }
820 switch(num) {
821 case 2:
822 case 3:
823 case 4:
824 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
825 break;
826 default:
827 return -EINVAL;
828 }
829 next:
830 vers += len + 1;
831 } while ((len = qword_get(&mesg, vers, size)) > 0);
832 /* If all get turned off, turn them back on, as
833 * having no versions is BAD
834 */
835 nfsd_reset_versions();
836 }
837
838 /* Now write current state into reply buffer */
839 len = 0;
840 sep = "";
841 remaining = SIMPLE_TRANSACTION_LIMIT;
842 for (num=2 ; num <= 4 ; num++)
843 if (nfsd_vers(num, NFSD_AVAIL)) {
844 len = snprintf(buf, remaining, "%s%c%d", sep,
845 nfsd_vers(num, NFSD_TEST)?'+':'-',
846 num);
847 sep = " ";
848
849 if (len > remaining)
850 break;
851 remaining -= len;
852 buf += len;
853 tlen += len;
854 }
855 if (nfsd_vers(4, NFSD_AVAIL))
856 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
857 minor++) {
858 len = snprintf(buf, remaining, " %c4.%u",
859 (nfsd_vers(4, NFSD_TEST) &&
860 nfsd_minorversion(minor, NFSD_TEST)) ?
861 '+' : '-',
862 minor);
863
864 if (len > remaining)
865 break;
866 remaining -= len;
867 buf += len;
868 tlen += len;
869 }
870
871 len = snprintf(buf, remaining, "\n");
872 if (len > remaining)
873 return -EINVAL;
874 return tlen + len;
875 }
876
877 /**
878 * write_versions - Set or report the available NFS protocol versions
879 *
880 * Input:
881 * buf: ignored
882 * size: zero
883 * Output:
884 * On success: passed-in buffer filled with '\n'-terminated C
885 * string containing positive or negative integer
886 * values representing the current status of each
887 * protocol version;
888 * return code is the size in bytes of the string
889 * On error: return code is zero or a negative errno value
890 *
891 * OR
892 *
893 * Input:
894 * buf: C string containing whitespace-
895 * separated positive or negative
896 * integer values representing NFS
897 * protocol versions to enable ("+n")
898 * or disable ("-n")
899 * size: non-zero length of C string in @buf
900 * Output:
901 * On success: status of zero or more protocol versions has
902 * been updated; passed-in buffer filled with
903 * '\n'-terminated C string containing positive
904 * or negative integer values representing the
905 * current status of each protocol version;
906 * return code is the size in bytes of the string
907 * On error: return code is zero or a negative errno value
908 */
909 static ssize_t write_versions(struct file *file, char *buf, size_t size)
910 {
911 ssize_t rv;
912
913 mutex_lock(&nfsd_mutex);
914 rv = __write_versions(file, buf, size);
915 mutex_unlock(&nfsd_mutex);
916 return rv;
917 }
918
919 /*
920 * Zero-length write. Return a list of NFSD's current listener
921 * transports.
922 */
923 static ssize_t __write_ports_names(char *buf)
924 {
925 if (nfsd_serv == NULL)
926 return 0;
927 return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
928 }
929
930 /*
931 * A single 'fd' number was written, in which case it must be for
932 * a socket of a supported family/protocol, and we use it as an
933 * nfsd listener.
934 */
935 static ssize_t __write_ports_addfd(char *buf)
936 {
937 char *mesg = buf;
938 int fd, err;
939
940 err = get_int(&mesg, &fd);
941 if (err != 0 || fd < 0)
942 return -EINVAL;
943
944 err = nfsd_create_serv();
945 if (err != 0)
946 return err;
947
948 err = lockd_up();
949 if (err != 0)
950 goto out;
951
952 err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
953 if (err < 0)
954 lockd_down();
955
956 out:
957 /* Decrease the count, but don't shut down the service */
958 nfsd_serv->sv_nrthreads--;
959 return err;
960 }
961
962 /*
963 * A '-' followed by the 'name' of a socket means we close the socket.
964 */
965 static ssize_t __write_ports_delfd(char *buf)
966 {
967 char *toclose;
968 int len = 0;
969
970 toclose = kstrdup(buf + 1, GFP_KERNEL);
971 if (toclose == NULL)
972 return -ENOMEM;
973
974 if (nfsd_serv != NULL)
975 len = svc_sock_names(nfsd_serv, buf,
976 SIMPLE_TRANSACTION_LIMIT, toclose);
977 if (len >= 0)
978 lockd_down();
979
980 kfree(toclose);
981 return len;
982 }
983
984 /*
985 * A transport listener is added by writing it's transport name and
986 * a port number.
987 */
988 static ssize_t __write_ports_addxprt(char *buf)
989 {
990 char transport[16];
991 struct svc_xprt *xprt;
992 int port, err;
993
994 if (sscanf(buf, "%15s %4u", transport, &port) != 2)
995 return -EINVAL;
996
997 if (port < 1 || port > USHORT_MAX)
998 return -EINVAL;
999
1000 err = nfsd_create_serv();
1001 if (err != 0)
1002 return err;
1003
1004 err = svc_create_xprt(nfsd_serv, transport,
1005 PF_INET, port, SVC_SOCK_ANONYMOUS);
1006 if (err < 0)
1007 goto out_err;
1008
1009 err = svc_create_xprt(nfsd_serv, transport,
1010 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1011 if (err < 0 && err != -EAFNOSUPPORT)
1012 goto out_close;
1013 return 0;
1014 out_close:
1015 xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1016 if (xprt != NULL) {
1017 svc_close_xprt(xprt);
1018 svc_xprt_put(xprt);
1019 }
1020 out_err:
1021 /* Decrease the count, but don't shut down the service */
1022 nfsd_serv->sv_nrthreads--;
1023 return err;
1024 }
1025
1026 /*
1027 * A transport listener is removed by writing a "-", it's transport
1028 * name, and it's port number.
1029 */
1030 static ssize_t __write_ports_delxprt(char *buf)
1031 {
1032 struct svc_xprt *xprt;
1033 char transport[16];
1034 int port;
1035
1036 if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1037 return -EINVAL;
1038
1039 if (port < 1 || port > USHORT_MAX || nfsd_serv == NULL)
1040 return -EINVAL;
1041
1042 xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1043 if (xprt == NULL)
1044 return -ENOTCONN;
1045
1046 svc_close_xprt(xprt);
1047 svc_xprt_put(xprt);
1048 return 0;
1049 }
1050
1051 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1052 {
1053 if (size == 0)
1054 return __write_ports_names(buf);
1055
1056 if (isdigit(buf[0]))
1057 return __write_ports_addfd(buf);
1058
1059 if (buf[0] == '-' && isdigit(buf[1]))
1060 return __write_ports_delfd(buf);
1061
1062 if (isalpha(buf[0]))
1063 return __write_ports_addxprt(buf);
1064
1065 if (buf[0] == '-' && isalpha(buf[1]))
1066 return __write_ports_delxprt(buf);
1067
1068 return -EINVAL;
1069 }
1070
1071 /**
1072 * write_ports - Pass a socket file descriptor or transport name to listen on
1073 *
1074 * Input:
1075 * buf: ignored
1076 * size: zero
1077 * Output:
1078 * On success: passed-in buffer filled with a '\n'-terminated C
1079 * string containing a whitespace-separated list of
1080 * named NFSD listeners;
1081 * return code is the size in bytes of the string
1082 * On error: return code is zero or a negative errno value
1083 *
1084 * OR
1085 *
1086 * Input:
1087 * buf: C string containing an unsigned
1088 * integer value representing a bound
1089 * but unconnected socket that is to be
1090 * used as an NFSD listener; listen(3)
1091 * must be called for a SOCK_STREAM
1092 * socket, otherwise it is ignored
1093 * size: non-zero length of C string in @buf
1094 * Output:
1095 * On success: NFS service is started;
1096 * passed-in buffer filled with a '\n'-terminated C
1097 * string containing a unique alphanumeric name of
1098 * the listener;
1099 * return code is the size in bytes of the string
1100 * On error: return code is a negative errno value
1101 *
1102 * OR
1103 *
1104 * Input:
1105 * buf: C string containing a "-" followed
1106 * by an integer value representing a
1107 * previously passed in socket file
1108 * descriptor
1109 * size: non-zero length of C string in @buf
1110 * Output:
1111 * On success: NFS service no longer listens on that socket;
1112 * passed-in buffer filled with a '\n'-terminated C
1113 * string containing a unique name of the listener;
1114 * return code is the size in bytes of the string
1115 * On error: return code is a negative errno value
1116 *
1117 * OR
1118 *
1119 * Input:
1120 * buf: C string containing a transport
1121 * name and an unsigned integer value
1122 * representing the port to listen on,
1123 * separated by whitespace
1124 * size: non-zero length of C string in @buf
1125 * Output:
1126 * On success: returns zero; NFS service is started
1127 * On error: return code is a negative errno value
1128 *
1129 * OR
1130 *
1131 * Input:
1132 * buf: C string containing a "-" followed
1133 * by a transport name and an unsigned
1134 * integer value representing the port
1135 * to listen on, separated by whitespace
1136 * size: non-zero length of C string in @buf
1137 * Output:
1138 * On success: returns zero; NFS service no longer listens
1139 * on that transport
1140 * On error: return code is a negative errno value
1141 */
1142 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1143 {
1144 ssize_t rv;
1145
1146 mutex_lock(&nfsd_mutex);
1147 rv = __write_ports(file, buf, size);
1148 mutex_unlock(&nfsd_mutex);
1149 return rv;
1150 }
1151
1152
1153 int nfsd_max_blksize;
1154
1155 /**
1156 * write_maxblksize - Set or report the current NFS blksize
1157 *
1158 * Input:
1159 * buf: ignored
1160 * size: zero
1161 *
1162 * OR
1163 *
1164 * Input:
1165 * buf: C string containing an unsigned
1166 * integer value representing the new
1167 * NFS blksize
1168 * size: non-zero length of C string in @buf
1169 * Output:
1170 * On success: passed-in buffer filled with '\n'-terminated C string
1171 * containing numeric value of the current NFS blksize
1172 * setting;
1173 * return code is the size in bytes of the string
1174 * On error: return code is zero or a negative errno value
1175 */
1176 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1177 {
1178 char *mesg = buf;
1179 if (size > 0) {
1180 int bsize;
1181 int rv = get_int(&mesg, &bsize);
1182 if (rv)
1183 return rv;
1184 /* force bsize into allowed range and
1185 * required alignment.
1186 */
1187 if (bsize < 1024)
1188 bsize = 1024;
1189 if (bsize > NFSSVC_MAXBLKSIZE)
1190 bsize = NFSSVC_MAXBLKSIZE;
1191 bsize &= ~(1024-1);
1192 mutex_lock(&nfsd_mutex);
1193 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
1194 mutex_unlock(&nfsd_mutex);
1195 return -EBUSY;
1196 }
1197 nfsd_max_blksize = bsize;
1198 mutex_unlock(&nfsd_mutex);
1199 }
1200
1201 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1202 nfsd_max_blksize);
1203 }
1204
1205 #ifdef CONFIG_NFSD_V4
1206 extern time_t nfs4_leasetime(void);
1207
1208 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
1209 {
1210 /* if size > 10 seconds, call
1211 * nfs4_reset_lease() then write out the new lease (seconds) as reply
1212 */
1213 char *mesg = buf;
1214 int rv, lease;
1215
1216 if (size > 0) {
1217 if (nfsd_serv)
1218 return -EBUSY;
1219 rv = get_int(&mesg, &lease);
1220 if (rv)
1221 return rv;
1222 if (lease < 10 || lease > 3600)
1223 return -EINVAL;
1224 nfs4_reset_lease(lease);
1225 }
1226
1227 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n",
1228 nfs4_lease_time());
1229 }
1230
1231 /**
1232 * write_leasetime - Set or report the current NFSv4 lease time
1233 *
1234 * Input:
1235 * buf: ignored
1236 * size: zero
1237 *
1238 * OR
1239 *
1240 * Input:
1241 * buf: C string containing an unsigned
1242 * integer value representing the new
1243 * NFSv4 lease expiry time
1244 * size: non-zero length of C string in @buf
1245 * Output:
1246 * On success: passed-in buffer filled with '\n'-terminated C
1247 * string containing unsigned integer value of the
1248 * current lease expiry time;
1249 * return code is the size in bytes of the string
1250 * On error: return code is zero or a negative errno value
1251 */
1252 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1253 {
1254 ssize_t rv;
1255
1256 mutex_lock(&nfsd_mutex);
1257 rv = __write_leasetime(file, buf, size);
1258 mutex_unlock(&nfsd_mutex);
1259 return rv;
1260 }
1261
1262 extern char *nfs4_recoverydir(void);
1263
1264 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1265 {
1266 char *mesg = buf;
1267 char *recdir;
1268 int len, status;
1269
1270 if (size > 0) {
1271 if (nfsd_serv)
1272 return -EBUSY;
1273 if (size > PATH_MAX || buf[size-1] != '\n')
1274 return -EINVAL;
1275 buf[size-1] = 0;
1276
1277 recdir = mesg;
1278 len = qword_get(&mesg, recdir, size);
1279 if (len <= 0)
1280 return -EINVAL;
1281
1282 status = nfs4_reset_recoverydir(recdir);
1283 }
1284
1285 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1286 nfs4_recoverydir());
1287 }
1288
1289 /**
1290 * write_recoverydir - Set or report the pathname of the recovery directory
1291 *
1292 * Input:
1293 * buf: ignored
1294 * size: zero
1295 *
1296 * OR
1297 *
1298 * Input:
1299 * buf: C string containing the pathname
1300 * of the directory on a local file
1301 * system containing permanent NFSv4
1302 * recovery data
1303 * size: non-zero length of C string in @buf
1304 * Output:
1305 * On success: passed-in buffer filled with '\n'-terminated C string
1306 * containing the current recovery pathname setting;
1307 * return code is the size in bytes of the string
1308 * On error: return code is zero or a negative errno value
1309 */
1310 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1311 {
1312 ssize_t rv;
1313
1314 mutex_lock(&nfsd_mutex);
1315 rv = __write_recoverydir(file, buf, size);
1316 mutex_unlock(&nfsd_mutex);
1317 return rv;
1318 }
1319
1320 #endif
1321
1322 /*----------------------------------------------------------------------------*/
1323 /*
1324 * populating the filesystem.
1325 */
1326
1327 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1328 {
1329 static struct tree_descr nfsd_files[] = {
1330 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1331 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1332 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1333 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1334 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1335 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1336 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1337 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1338 [NFSD_Export_features] = {"export_features",
1339 &export_features_operations, S_IRUGO},
1340 [NFSD_FO_UnlockIP] = {"unlock_ip",
1341 &transaction_ops, S_IWUSR|S_IRUSR},
1342 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1343 &transaction_ops, S_IWUSR|S_IRUSR},
1344 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1345 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1346 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1347 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1348 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1349 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1350 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1351 #ifdef CONFIG_NFSD_V4
1352 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1353 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1354 #endif
1355 /* last one */ {""}
1356 };
1357 return simple_fill_super(sb, 0x6e667364, nfsd_files);
1358 }
1359
1360 static int nfsd_get_sb(struct file_system_type *fs_type,
1361 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1362 {
1363 return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1364 }
1365
1366 static struct file_system_type nfsd_fs_type = {
1367 .owner = THIS_MODULE,
1368 .name = "nfsd",
1369 .get_sb = nfsd_get_sb,
1370 .kill_sb = kill_litter_super,
1371 };
1372
1373 #ifdef CONFIG_PROC_FS
1374 static int create_proc_exports_entry(void)
1375 {
1376 struct proc_dir_entry *entry;
1377
1378 entry = proc_mkdir("fs/nfs", NULL);
1379 if (!entry)
1380 return -ENOMEM;
1381 entry = proc_create("exports", 0, entry, &exports_operations);
1382 if (!entry)
1383 return -ENOMEM;
1384 return 0;
1385 }
1386 #else /* CONFIG_PROC_FS */
1387 static int create_proc_exports_entry(void)
1388 {
1389 return 0;
1390 }
1391 #endif
1392
1393 static int __init init_nfsd(void)
1394 {
1395 int retval;
1396 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1397
1398 retval = nfs4_state_init(); /* nfs4 locking state */
1399 if (retval)
1400 return retval;
1401 nfsd_stat_init(); /* Statistics */
1402 retval = nfsd_reply_cache_init();
1403 if (retval)
1404 goto out_free_stat;
1405 retval = nfsd_export_init();
1406 if (retval)
1407 goto out_free_cache;
1408 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1409 retval = nfsd_idmap_init();
1410 if (retval)
1411 goto out_free_lockd;
1412 retval = create_proc_exports_entry();
1413 if (retval)
1414 goto out_free_idmap;
1415 retval = register_filesystem(&nfsd_fs_type);
1416 if (retval)
1417 goto out_free_all;
1418 return 0;
1419 out_free_all:
1420 remove_proc_entry("fs/nfs/exports", NULL);
1421 remove_proc_entry("fs/nfs", NULL);
1422 out_free_idmap:
1423 nfsd_idmap_shutdown();
1424 out_free_lockd:
1425 nfsd_lockd_shutdown();
1426 nfsd_export_shutdown();
1427 out_free_cache:
1428 nfsd_reply_cache_shutdown();
1429 out_free_stat:
1430 nfsd_stat_shutdown();
1431 nfsd4_free_slabs();
1432 return retval;
1433 }
1434
1435 static void __exit exit_nfsd(void)
1436 {
1437 nfsd_export_shutdown();
1438 nfsd_reply_cache_shutdown();
1439 remove_proc_entry("fs/nfs/exports", NULL);
1440 remove_proc_entry("fs/nfs", NULL);
1441 nfsd_stat_shutdown();
1442 nfsd_lockd_shutdown();
1443 nfsd_idmap_shutdown();
1444 nfsd4_free_slabs();
1445 unregister_filesystem(&nfsd_fs_type);
1446 }
1447
1448 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1449 MODULE_LICENSE("GPL");
1450 module_init(init_nfsd)
1451 module_exit(exit_nfsd)
Linux kernel - Deliverables
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