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[WATCHDOG] mpc83xx_wdt: convert to the OF platform driver
[linux-2.6/linux-2.6-openrd.git] / fs / nfsd / nfsctl.c
blobc53e65f8f3a2b460d6c01424094b29c8082843a4
1 /*
2 * linux/fs/nfsd/nfsctl.c
3 *
4 * Syscall interface to knfsd.
5 *
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7 */
8
9 #include <linux/module.h>
10
11 #include <linux/linkage.h>
12 #include <linux/time.h>
13 #include <linux/errno.h>
14 #include <linux/fs.h>
15 #include <linux/namei.h>
16 #include <linux/fcntl.h>
17 #include <linux/net.h>
18 #include <linux/in.h>
19 #include <linux/syscalls.h>
20 #include <linux/unistd.h>
21 #include <linux/slab.h>
22 #include <linux/proc_fs.h>
23 #include <linux/seq_file.h>
24 #include <linux/pagemap.h>
25 #include <linux/init.h>
26 #include <linux/inet.h>
27 #include <linux/string.h>
28 #include <linux/smp_lock.h>
29 #include <linux/ctype.h>
30
31 #include <linux/nfs.h>
32 #include <linux/nfsd_idmap.h>
33 #include <linux/lockd/bind.h>
34 #include <linux/sunrpc/svc.h>
35 #include <linux/sunrpc/svcsock.h>
36 #include <linux/nfsd/nfsd.h>
37 #include <linux/nfsd/cache.h>
38 #include <linux/nfsd/xdr.h>
39 #include <linux/nfsd/syscall.h>
40 #include <linux/lockd/lockd.h>
41
42 #include <asm/uaccess.h>
43 #include <net/ipv6.h>
44
45 /*
46 * We have a single directory with 9 nodes in it.
47 */
48 enum {
49 NFSD_Root = 1,
50 NFSD_Svc,
51 NFSD_Add,
52 NFSD_Del,
53 NFSD_Export,
54 NFSD_Unexport,
55 NFSD_Getfd,
56 NFSD_Getfs,
57 NFSD_List,
58 NFSD_Fh,
59 NFSD_FO_UnlockIP,
60 NFSD_FO_UnlockFS,
61 NFSD_Threads,
62 NFSD_Pool_Threads,
63 NFSD_Versions,
64 NFSD_Ports,
65 NFSD_MaxBlkSize,
66 /*
67 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
68 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
69 */
70 #ifdef CONFIG_NFSD_V4
71 NFSD_Leasetime,
72 NFSD_RecoveryDir,
73 #endif
74 };
75
76 /*
77 * write() for these nodes.
78 */
79 static ssize_t write_svc(struct file *file, char *buf, size_t size);
80 static ssize_t write_add(struct file *file, char *buf, size_t size);
81 static ssize_t write_del(struct file *file, char *buf, size_t size);
82 static ssize_t write_export(struct file *file, char *buf, size_t size);
83 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
84 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
85 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
86 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
87 static ssize_t write_threads(struct file *file, char *buf, size_t size);
88 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
89 static ssize_t write_versions(struct file *file, char *buf, size_t size);
90 static ssize_t write_ports(struct file *file, char *buf, size_t size);
91 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
92 #ifdef CONFIG_NFSD_V4
93 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
94 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
95 #endif
96
97 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size);
98 static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size);
99
100 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
101 [NFSD_Svc] = write_svc,
102 [NFSD_Add] = write_add,
103 [NFSD_Del] = write_del,
104 [NFSD_Export] = write_export,
105 [NFSD_Unexport] = write_unexport,
106 [NFSD_Getfd] = write_getfd,
107 [NFSD_Getfs] = write_getfs,
108 [NFSD_Fh] = write_filehandle,
109 [NFSD_FO_UnlockIP] = failover_unlock_ip,
110 [NFSD_FO_UnlockFS] = failover_unlock_fs,
111 [NFSD_Threads] = write_threads,
112 [NFSD_Pool_Threads] = write_pool_threads,
113 [NFSD_Versions] = write_versions,
114 [NFSD_Ports] = write_ports,
115 [NFSD_MaxBlkSize] = write_maxblksize,
116 #ifdef CONFIG_NFSD_V4
117 [NFSD_Leasetime] = write_leasetime,
118 [NFSD_RecoveryDir] = write_recoverydir,
119 #endif
120 };
121
122 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
123 {
124 ino_t ino = file->f_path.dentry->d_inode->i_ino;
125 char *data;
126 ssize_t rv;
127
128 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
129 return -EINVAL;
130
131 data = simple_transaction_get(file, buf, size);
132 if (IS_ERR(data))
133 return PTR_ERR(data);
134
135 rv = write_op[ino](file, data, size);
136 if (rv >= 0) {
137 simple_transaction_set(file, rv);
138 rv = size;
139 }
140 return rv;
141 }
142
143 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
144 {
145 if (! file->private_data) {
146 /* An attempt to read a transaction file without writing
147 * causes a 0-byte write so that the file can return
148 * state information
149 */
150 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
151 if (rv < 0)
152 return rv;
153 }
154 return simple_transaction_read(file, buf, size, pos);
155 }
156
157 static const struct file_operations transaction_ops = {
158 .write = nfsctl_transaction_write,
159 .read = nfsctl_transaction_read,
160 .release = simple_transaction_release,
161 };
162
163 static int exports_open(struct inode *inode, struct file *file)
164 {
165 return seq_open(file, &nfs_exports_op);
166 }
167
168 static const struct file_operations exports_operations = {
169 .open = exports_open,
170 .read = seq_read,
171 .llseek = seq_lseek,
172 .release = seq_release,
173 .owner = THIS_MODULE,
174 };
175
176 /*----------------------------------------------------------------------------*/
177 /*
178 * payload - write methods
179 * If the method has a response, the response should be put in buf,
180 * and the length returned. Otherwise return 0 or and -error.
181 */
182
183 static ssize_t write_svc(struct file *file, char *buf, size_t size)
184 {
185 struct nfsctl_svc *data;
186 if (size < sizeof(*data))
187 return -EINVAL;
188 data = (struct nfsctl_svc*) buf;
189 return nfsd_svc(data->svc_port, data->svc_nthreads);
190 }
191
192 static ssize_t write_add(struct file *file, char *buf, size_t size)
193 {
194 struct nfsctl_client *data;
195 if (size < sizeof(*data))
196 return -EINVAL;
197 data = (struct nfsctl_client *)buf;
198 return exp_addclient(data);
199 }
200
201 static ssize_t write_del(struct file *file, char *buf, size_t size)
202 {
203 struct nfsctl_client *data;
204 if (size < sizeof(*data))
205 return -EINVAL;
206 data = (struct nfsctl_client *)buf;
207 return exp_delclient(data);
208 }
209
210 static ssize_t write_export(struct file *file, char *buf, size_t size)
211 {
212 struct nfsctl_export *data;
213 if (size < sizeof(*data))
214 return -EINVAL;
215 data = (struct nfsctl_export*)buf;
216 return exp_export(data);
217 }
218
219 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
220 {
221 struct nfsctl_export *data;
222
223 if (size < sizeof(*data))
224 return -EINVAL;
225 data = (struct nfsctl_export*)buf;
226 return exp_unexport(data);
227 }
228
229 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
230 {
231 struct nfsctl_fsparm *data;
232 struct sockaddr_in *sin;
233 struct auth_domain *clp;
234 int err = 0;
235 struct knfsd_fh *res;
236 struct in6_addr in6;
237
238 if (size < sizeof(*data))
239 return -EINVAL;
240 data = (struct nfsctl_fsparm*)buf;
241 err = -EPROTONOSUPPORT;
242 if (data->gd_addr.sa_family != AF_INET)
243 goto out;
244 sin = (struct sockaddr_in *)&data->gd_addr;
245 if (data->gd_maxlen > NFS3_FHSIZE)
246 data->gd_maxlen = NFS3_FHSIZE;
247
248 res = (struct knfsd_fh*)buf;
249
250 exp_readlock();
251
252 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
253
254 clp = auth_unix_lookup(&in6);
255 if (!clp)
256 err = -EPERM;
257 else {
258 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
259 auth_domain_put(clp);
260 }
261 exp_readunlock();
262 if (err == 0)
263 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
264 out:
265 return err;
266 }
267
268 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
269 {
270 struct nfsctl_fdparm *data;
271 struct sockaddr_in *sin;
272 struct auth_domain *clp;
273 int err = 0;
274 struct knfsd_fh fh;
275 char *res;
276 struct in6_addr in6;
277
278 if (size < sizeof(*data))
279 return -EINVAL;
280 data = (struct nfsctl_fdparm*)buf;
281 err = -EPROTONOSUPPORT;
282 if (data->gd_addr.sa_family != AF_INET)
283 goto out;
284 err = -EINVAL;
285 if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
286 goto out;
287
288 res = buf;
289 sin = (struct sockaddr_in *)&data->gd_addr;
290 exp_readlock();
291
292 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
293
294 clp = auth_unix_lookup(&in6);
295 if (!clp)
296 err = -EPERM;
297 else {
298 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
299 auth_domain_put(clp);
300 }
301 exp_readunlock();
302
303 if (err == 0) {
304 memset(res,0, NFS_FHSIZE);
305 memcpy(res, &fh.fh_base, fh.fh_size);
306 err = NFS_FHSIZE;
307 }
308 out:
309 return err;
310 }
311
312 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size)
313 {
314 struct sockaddr_in sin = {
315 .sin_family = AF_INET,
316 };
317 int b1, b2, b3, b4;
318 char c;
319 char *fo_path;
320
321 /* sanity check */
322 if (size == 0)
323 return -EINVAL;
324
325 if (buf[size-1] != '\n')
326 return -EINVAL;
327
328 fo_path = buf;
329 if (qword_get(&buf, fo_path, size) < 0)
330 return -EINVAL;
331
332 /* get ipv4 address */
333 if (sscanf(fo_path, NIPQUAD_FMT "%c", &b1, &b2, &b3, &b4, &c) != 4)
334 return -EINVAL;
335 if (b1 > 255 || b2 > 255 || b3 > 255 || b4 > 255)
336 return -EINVAL;
337 sin.sin_addr.s_addr = htonl((b1 << 24) | (b2 << 16) | (b3 << 8) | b4);
338
339 return nlmsvc_unlock_all_by_ip((struct sockaddr *)&sin);
340 }
341
342 static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size)
343 {
344 struct nameidata nd;
345 char *fo_path;
346 int error;
347
348 /* sanity check */
349 if (size == 0)
350 return -EINVAL;
351
352 if (buf[size-1] != '\n')
353 return -EINVAL;
354
355 fo_path = buf;
356 if (qword_get(&buf, fo_path, size) < 0)
357 return -EINVAL;
358
359 error = path_lookup(fo_path, 0, &nd);
360 if (error)
361 return error;
362
363 error = nlmsvc_unlock_all_by_sb(nd.path.mnt->mnt_sb);
364
365 path_put(&nd.path);
366 return error;
367 }
368
369 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
370 {
371 /* request is:
372 * domain path maxsize
373 * response is
374 * filehandle
375 *
376 * qword quoting is used, so filehandle will be \x....
377 */
378 char *dname, *path;
379 int uninitialized_var(maxsize);
380 char *mesg = buf;
381 int len;
382 struct auth_domain *dom;
383 struct knfsd_fh fh;
384
385 if (size == 0)
386 return -EINVAL;
387
388 if (buf[size-1] != '\n')
389 return -EINVAL;
390 buf[size-1] = 0;
391
392 dname = mesg;
393 len = qword_get(&mesg, dname, size);
394 if (len <= 0) return -EINVAL;
395
396 path = dname+len+1;
397 len = qword_get(&mesg, path, size);
398 if (len <= 0) return -EINVAL;
399
400 len = get_int(&mesg, &maxsize);
401 if (len)
402 return len;
403
404 if (maxsize < NFS_FHSIZE)
405 return -EINVAL;
406 if (maxsize > NFS3_FHSIZE)
407 maxsize = NFS3_FHSIZE;
408
409 if (qword_get(&mesg, mesg, size)>0)
410 return -EINVAL;
411
412 /* we have all the words, they are in buf.. */
413 dom = unix_domain_find(dname);
414 if (!dom)
415 return -ENOMEM;
416
417 len = exp_rootfh(dom, path, &fh, maxsize);
418 auth_domain_put(dom);
419 if (len)
420 return len;
421
422 mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
423 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
424 mesg[-1] = '\n';
425 return mesg - buf;
426 }
427
428 static ssize_t write_threads(struct file *file, char *buf, size_t size)
429 {
430 /* if size > 0, look for a number of threads and call nfsd_svc
431 * then write out number of threads as reply
432 */
433 char *mesg = buf;
434 int rv;
435 if (size > 0) {
436 int newthreads;
437 rv = get_int(&mesg, &newthreads);
438 if (rv)
439 return rv;
440 if (newthreads <0)
441 return -EINVAL;
442 rv = nfsd_svc(2049, newthreads);
443 if (rv)
444 return rv;
445 }
446 sprintf(buf, "%d\n", nfsd_nrthreads());
447 return strlen(buf);
448 }
449
450 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
451 {
452 /* if size > 0, look for an array of number of threads per node
453 * and apply them then write out number of threads per node as reply
454 */
455 char *mesg = buf;
456 int i;
457 int rv;
458 int len;
459 int npools;
460 int *nthreads;
461
462 mutex_lock(&nfsd_mutex);
463 npools = nfsd_nrpools();
464 if (npools == 0) {
465 /*
466 * NFS is shut down. The admin can start it by
467 * writing to the threads file but NOT the pool_threads
468 * file, sorry. Report zero threads.
469 */
470 mutex_unlock(&nfsd_mutex);
471 strcpy(buf, "0\n");
472 return strlen(buf);
473 }
474
475 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
476 rv = -ENOMEM;
477 if (nthreads == NULL)
478 goto out_free;
479
480 if (size > 0) {
481 for (i = 0; i < npools; i++) {
482 rv = get_int(&mesg, &nthreads[i]);
483 if (rv == -ENOENT)
484 break; /* fewer numbers than pools */
485 if (rv)
486 goto out_free; /* syntax error */
487 rv = -EINVAL;
488 if (nthreads[i] < 0)
489 goto out_free;
490 }
491 rv = nfsd_set_nrthreads(i, nthreads);
492 if (rv)
493 goto out_free;
494 }
495
496 rv = nfsd_get_nrthreads(npools, nthreads);
497 if (rv)
498 goto out_free;
499
500 mesg = buf;
501 size = SIMPLE_TRANSACTION_LIMIT;
502 for (i = 0; i < npools && size > 0; i++) {
503 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
504 len = strlen(mesg);
505 size -= len;
506 mesg += len;
507 }
508
509 mutex_unlock(&nfsd_mutex);
510 return (mesg-buf);
511
512 out_free:
513 kfree(nthreads);
514 mutex_unlock(&nfsd_mutex);
515 return rv;
516 }
517
518 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
519 {
520 /*
521 * Format:
522 * [-/+]vers [-/+]vers ...
523 */
524 char *mesg = buf;
525 char *vers, sign;
526 int len, num;
527 ssize_t tlen = 0;
528 char *sep;
529
530 if (size>0) {
531 if (nfsd_serv)
532 /* Cannot change versions without updating
533 * nfsd_serv->sv_xdrsize, and reallocing
534 * rq_argp and rq_resp
535 */
536 return -EBUSY;
537 if (buf[size-1] != '\n')
538 return -EINVAL;
539 buf[size-1] = 0;
540
541 vers = mesg;
542 len = qword_get(&mesg, vers, size);
543 if (len <= 0) return -EINVAL;
544 do {
545 sign = *vers;
546 if (sign == '+' || sign == '-')
547 num = simple_strtol((vers+1), NULL, 0);
548 else
549 num = simple_strtol(vers, NULL, 0);
550 switch(num) {
551 case 2:
552 case 3:
553 case 4:
554 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
555 break;
556 default:
557 return -EINVAL;
558 }
559 vers += len + 1;
560 tlen += len;
561 } while ((len = qword_get(&mesg, vers, size)) > 0);
562 /* If all get turned off, turn them back on, as
563 * having no versions is BAD
564 */
565 nfsd_reset_versions();
566 }
567 /* Now write current state into reply buffer */
568 len = 0;
569 sep = "";
570 for (num=2 ; num <= 4 ; num++)
571 if (nfsd_vers(num, NFSD_AVAIL)) {
572 len += sprintf(buf+len, "%s%c%d", sep,
573 nfsd_vers(num, NFSD_TEST)?'+':'-',
574 num);
575 sep = " ";
576 }
577 len += sprintf(buf+len, "\n");
578 return len;
579 }
580
581 static ssize_t write_versions(struct file *file, char *buf, size_t size)
582 {
583 ssize_t rv;
584
585 mutex_lock(&nfsd_mutex);
586 rv = __write_versions(file, buf, size);
587 mutex_unlock(&nfsd_mutex);
588 return rv;
589 }
590
591 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
592 {
593 if (size == 0) {
594 int len = 0;
595
596 if (nfsd_serv)
597 len = svc_xprt_names(nfsd_serv, buf, 0);
598 return len;
599 }
600 /* Either a single 'fd' number is written, in which
601 * case it must be for a socket of a supported family/protocol,
602 * and we use it as an nfsd socket, or
603 * A '-' followed by the 'name' of a socket in which case
604 * we close the socket.
605 */
606 if (isdigit(buf[0])) {
607 char *mesg = buf;
608 int fd;
609 int err;
610 err = get_int(&mesg, &fd);
611 if (err)
612 return -EINVAL;
613 if (fd < 0)
614 return -EINVAL;
615 err = nfsd_create_serv();
616 if (!err) {
617 int proto = 0;
618 err = svc_addsock(nfsd_serv, fd, buf, &proto);
619 if (err >= 0) {
620 err = lockd_up(proto);
621 if (err < 0)
622 svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
623 }
624 /* Decrease the count, but don't shutdown the
625 * the service
626 */
627 nfsd_serv->sv_nrthreads--;
628 }
629 return err < 0 ? err : 0;
630 }
631 if (buf[0] == '-' && isdigit(buf[1])) {
632 char *toclose = kstrdup(buf+1, GFP_KERNEL);
633 int len = 0;
634 if (!toclose)
635 return -ENOMEM;
636 if (nfsd_serv)
637 len = svc_sock_names(buf, nfsd_serv, toclose);
638 if (len >= 0)
639 lockd_down();
640 kfree(toclose);
641 return len;
642 }
643 /*
644 * Add a transport listener by writing it's transport name
645 */
646 if (isalpha(buf[0])) {
647 int err;
648 char transport[16];
649 int port;
650 if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
651 err = nfsd_create_serv();
652 if (!err) {
653 err = svc_create_xprt(nfsd_serv,
654 transport, port,
655 SVC_SOCK_ANONYMOUS);
656 if (err == -ENOENT)
657 /* Give a reasonable perror msg for
658 * bad transport string */
659 err = -EPROTONOSUPPORT;
660 }
661 return err < 0 ? err : 0;
662 }
663 }
664 /*
665 * Remove a transport by writing it's transport name and port number
666 */
667 if (buf[0] == '-' && isalpha(buf[1])) {
668 struct svc_xprt *xprt;
669 int err = -EINVAL;
670 char transport[16];
671 int port;
672 if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
673 if (port == 0)
674 return -EINVAL;
675 if (nfsd_serv) {
676 xprt = svc_find_xprt(nfsd_serv, transport,
677 AF_UNSPEC, port);
678 if (xprt) {
679 svc_close_xprt(xprt);
680 svc_xprt_put(xprt);
681 err = 0;
682 } else
683 err = -ENOTCONN;
684 }
685 return err < 0 ? err : 0;
686 }
687 }
688 return -EINVAL;
689 }
690
691 static ssize_t write_ports(struct file *file, char *buf, size_t size)
692 {
693 ssize_t rv;
694
695 mutex_lock(&nfsd_mutex);
696 rv = __write_ports(file, buf, size);
697 mutex_unlock(&nfsd_mutex);
698 return rv;
699 }
700
701
702 int nfsd_max_blksize;
703
704 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
705 {
706 char *mesg = buf;
707 if (size > 0) {
708 int bsize;
709 int rv = get_int(&mesg, &bsize);
710 if (rv)
711 return rv;
712 /* force bsize into allowed range and
713 * required alignment.
714 */
715 if (bsize < 1024)
716 bsize = 1024;
717 if (bsize > NFSSVC_MAXBLKSIZE)
718 bsize = NFSSVC_MAXBLKSIZE;
719 bsize &= ~(1024-1);
720 mutex_lock(&nfsd_mutex);
721 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
722 mutex_unlock(&nfsd_mutex);
723 return -EBUSY;
724 }
725 nfsd_max_blksize = bsize;
726 mutex_unlock(&nfsd_mutex);
727 }
728 return sprintf(buf, "%d\n", nfsd_max_blksize);
729 }
730
731 #ifdef CONFIG_NFSD_V4
732 extern time_t nfs4_leasetime(void);
733
734 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
735 {
736 /* if size > 10 seconds, call
737 * nfs4_reset_lease() then write out the new lease (seconds) as reply
738 */
739 char *mesg = buf;
740 int rv, lease;
741
742 if (size > 0) {
743 if (nfsd_serv)
744 return -EBUSY;
745 rv = get_int(&mesg, &lease);
746 if (rv)
747 return rv;
748 if (lease < 10 || lease > 3600)
749 return -EINVAL;
750 nfs4_reset_lease(lease);
751 }
752 sprintf(buf, "%ld\n", nfs4_lease_time());
753 return strlen(buf);
754 }
755
756 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
757 {
758 ssize_t rv;
759
760 mutex_lock(&nfsd_mutex);
761 rv = __write_leasetime(file, buf, size);
762 mutex_unlock(&nfsd_mutex);
763 return rv;
764 }
765
766 extern char *nfs4_recoverydir(void);
767
768 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
769 {
770 char *mesg = buf;
771 char *recdir;
772 int len, status;
773
774 if (size > 0) {
775 if (nfsd_serv)
776 return -EBUSY;
777 if (size > PATH_MAX || buf[size-1] != '\n')
778 return -EINVAL;
779 buf[size-1] = 0;
780
781 recdir = mesg;
782 len = qword_get(&mesg, recdir, size);
783 if (len <= 0)
784 return -EINVAL;
785
786 status = nfs4_reset_recoverydir(recdir);
787 }
788 sprintf(buf, "%s\n", nfs4_recoverydir());
789 return strlen(buf);
790 }
791
792 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
793 {
794 ssize_t rv;
795
796 mutex_lock(&nfsd_mutex);
797 rv = __write_recoverydir(file, buf, size);
798 mutex_unlock(&nfsd_mutex);
799 return rv;
800 }
801
802 #endif
803
804 /*----------------------------------------------------------------------------*/
805 /*
806 * populating the filesystem.
807 */
808
809 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
810 {
811 static struct tree_descr nfsd_files[] = {
812 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
813 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
814 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
815 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
816 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
817 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
818 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
819 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
820 [NFSD_FO_UnlockIP] = {"unlock_ip",
821 &transaction_ops, S_IWUSR|S_IRUSR},
822 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
823 &transaction_ops, S_IWUSR|S_IRUSR},
824 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
825 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
826 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
827 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
828 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
829 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
830 #ifdef CONFIG_NFSD_V4
831 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
832 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
833 #endif
834 /* last one */ {""}
835 };
836 return simple_fill_super(sb, 0x6e667364, nfsd_files);
837 }
838
839 static int nfsd_get_sb(struct file_system_type *fs_type,
840 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
841 {
842 return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
843 }
844
845 static struct file_system_type nfsd_fs_type = {
846 .owner = THIS_MODULE,
847 .name = "nfsd",
848 .get_sb = nfsd_get_sb,
849 .kill_sb = kill_litter_super,
850 };
851
852 #ifdef CONFIG_PROC_FS
853 static int create_proc_exports_entry(void)
854 {
855 struct proc_dir_entry *entry;
856
857 entry = proc_mkdir("fs/nfs", NULL);
858 if (!entry)
859 return -ENOMEM;
860 entry = proc_create("exports", 0, entry, &exports_operations);
861 if (!entry)
862 return -ENOMEM;
863 return 0;
864 }
865 #else /* CONFIG_PROC_FS */
866 static int create_proc_exports_entry(void)
867 {
868 return 0;
869 }
870 #endif
871
872 static int __init init_nfsd(void)
873 {
874 int retval;
875 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
876
877 retval = nfs4_state_init(); /* nfs4 locking state */
878 if (retval)
879 return retval;
880 nfsd_stat_init(); /* Statistics */
881 retval = nfsd_reply_cache_init();
882 if (retval)
883 goto out_free_stat;
884 retval = nfsd_export_init();
885 if (retval)
886 goto out_free_cache;
887 nfsd_lockd_init(); /* lockd->nfsd callbacks */
888 retval = nfsd_idmap_init();
889 if (retval)
890 goto out_free_lockd;
891 retval = create_proc_exports_entry();
892 if (retval)
893 goto out_free_idmap;
894 retval = register_filesystem(&nfsd_fs_type);
895 if (retval)
896 goto out_free_all;
897 return 0;
898 out_free_all:
899 remove_proc_entry("fs/nfs/exports", NULL);
900 remove_proc_entry("fs/nfs", NULL);
901 out_free_idmap:
902 nfsd_idmap_shutdown();
903 out_free_lockd:
904 nfsd_lockd_shutdown();
905 nfsd_export_shutdown();
906 out_free_cache:
907 nfsd_reply_cache_shutdown();
908 out_free_stat:
909 nfsd_stat_shutdown();
910 nfsd4_free_slabs();
911 return retval;
912 }
913
914 static void __exit exit_nfsd(void)
915 {
916 nfsd_export_shutdown();
917 nfsd_reply_cache_shutdown();
918 remove_proc_entry("fs/nfs/exports", NULL);
919 remove_proc_entry("fs/nfs", NULL);
920 nfsd_stat_shutdown();
921 nfsd_lockd_shutdown();
922 nfsd_idmap_shutdown();
923 nfsd4_free_slabs();
924 unregister_filesystem(&nfsd_fs_type);
925 }
926
927 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
928 MODULE_LICENSE("GPL");
929 module_init(init_nfsd)
930 module_exit(exit_nfsd)
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