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x86: disable BTS ptrace extensions for now
[wrt350n-kernel.git] / fs / nfsd / nfsctl.c
blob8516137cdbb055ac87d1673c482126d2e670f488
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/fcntl.h>
16 #include <linux/net.h>
17 #include <linux/in.h>
18 #include <linux/syscalls.h>
19 #include <linux/unistd.h>
20 #include <linux/slab.h>
21 #include <linux/proc_fs.h>
22 #include <linux/seq_file.h>
23 #include <linux/pagemap.h>
24 #include <linux/init.h>
25 #include <linux/string.h>
26 #include <linux/smp_lock.h>
27 #include <linux/ctype.h>
28
29 #include <linux/nfs.h>
30 #include <linux/nfsd_idmap.h>
31 #include <linux/lockd/bind.h>
32 #include <linux/sunrpc/svc.h>
33 #include <linux/sunrpc/svcsock.h>
34 #include <linux/nfsd/nfsd.h>
35 #include <linux/nfsd/cache.h>
36 #include <linux/nfsd/xdr.h>
37 #include <linux/nfsd/syscall.h>
38
39 #include <asm/uaccess.h>
40
41 /*
42 * We have a single directory with 9 nodes in it.
43 */
44 enum {
45 NFSD_Root = 1,
46 NFSD_Svc,
47 NFSD_Add,
48 NFSD_Del,
49 NFSD_Export,
50 NFSD_Unexport,
51 NFSD_Getfd,
52 NFSD_Getfs,
53 NFSD_List,
54 NFSD_Fh,
55 NFSD_Threads,
56 NFSD_Pool_Threads,
57 NFSD_Versions,
58 NFSD_Ports,
59 NFSD_MaxBlkSize,
60 /*
61 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
62 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
63 */
64 #ifdef CONFIG_NFSD_V4
65 NFSD_Leasetime,
66 NFSD_RecoveryDir,
67 #endif
68 };
69
70 /*
71 * write() for these nodes.
72 */
73 static ssize_t write_svc(struct file *file, char *buf, size_t size);
74 static ssize_t write_add(struct file *file, char *buf, size_t size);
75 static ssize_t write_del(struct file *file, char *buf, size_t size);
76 static ssize_t write_export(struct file *file, char *buf, size_t size);
77 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
78 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
79 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
80 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
81 static ssize_t write_threads(struct file *file, char *buf, size_t size);
82 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
83 static ssize_t write_versions(struct file *file, char *buf, size_t size);
84 static ssize_t write_ports(struct file *file, char *buf, size_t size);
85 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
86 #ifdef CONFIG_NFSD_V4
87 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
88 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
89 #endif
90
91 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
92 [NFSD_Svc] = write_svc,
93 [NFSD_Add] = write_add,
94 [NFSD_Del] = write_del,
95 [NFSD_Export] = write_export,
96 [NFSD_Unexport] = write_unexport,
97 [NFSD_Getfd] = write_getfd,
98 [NFSD_Getfs] = write_getfs,
99 [NFSD_Fh] = write_filehandle,
100 [NFSD_Threads] = write_threads,
101 [NFSD_Pool_Threads] = write_pool_threads,
102 [NFSD_Versions] = write_versions,
103 [NFSD_Ports] = write_ports,
104 [NFSD_MaxBlkSize] = write_maxblksize,
105 #ifdef CONFIG_NFSD_V4
106 [NFSD_Leasetime] = write_leasetime,
107 [NFSD_RecoveryDir] = write_recoverydir,
108 #endif
109 };
110
111 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
112 {
113 ino_t ino = file->f_path.dentry->d_inode->i_ino;
114 char *data;
115 ssize_t rv;
116
117 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
118 return -EINVAL;
119
120 data = simple_transaction_get(file, buf, size);
121 if (IS_ERR(data))
122 return PTR_ERR(data);
123
124 rv = write_op[ino](file, data, size);
125 if (rv >= 0) {
126 simple_transaction_set(file, rv);
127 rv = size;
128 }
129 return rv;
130 }
131
132 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
133 {
134 if (! file->private_data) {
135 /* An attempt to read a transaction file without writing
136 * causes a 0-byte write so that the file can return
137 * state information
138 */
139 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
140 if (rv < 0)
141 return rv;
142 }
143 return simple_transaction_read(file, buf, size, pos);
144 }
145
146 static const struct file_operations transaction_ops = {
147 .write = nfsctl_transaction_write,
148 .read = nfsctl_transaction_read,
149 .release = simple_transaction_release,
150 };
151
152 extern struct seq_operations nfs_exports_op;
153 static int exports_open(struct inode *inode, struct file *file)
154 {
155 return seq_open(file, &nfs_exports_op);
156 }
157
158 static const struct file_operations exports_operations = {
159 .open = exports_open,
160 .read = seq_read,
161 .llseek = seq_lseek,
162 .release = seq_release,
163 };
164
165 /*----------------------------------------------------------------------------*/
166 /*
167 * payload - write methods
168 * If the method has a response, the response should be put in buf,
169 * and the length returned. Otherwise return 0 or and -error.
170 */
171
172 static ssize_t write_svc(struct file *file, char *buf, size_t size)
173 {
174 struct nfsctl_svc *data;
175 if (size < sizeof(*data))
176 return -EINVAL;
177 data = (struct nfsctl_svc*) buf;
178 return nfsd_svc(data->svc_port, data->svc_nthreads);
179 }
180
181 static ssize_t write_add(struct file *file, char *buf, size_t size)
182 {
183 struct nfsctl_client *data;
184 if (size < sizeof(*data))
185 return -EINVAL;
186 data = (struct nfsctl_client *)buf;
187 return exp_addclient(data);
188 }
189
190 static ssize_t write_del(struct file *file, char *buf, size_t size)
191 {
192 struct nfsctl_client *data;
193 if (size < sizeof(*data))
194 return -EINVAL;
195 data = (struct nfsctl_client *)buf;
196 return exp_delclient(data);
197 }
198
199 static ssize_t write_export(struct file *file, char *buf, size_t size)
200 {
201 struct nfsctl_export *data;
202 if (size < sizeof(*data))
203 return -EINVAL;
204 data = (struct nfsctl_export*)buf;
205 return exp_export(data);
206 }
207
208 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
209 {
210 struct nfsctl_export *data;
211
212 if (size < sizeof(*data))
213 return -EINVAL;
214 data = (struct nfsctl_export*)buf;
215 return exp_unexport(data);
216 }
217
218 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
219 {
220 struct nfsctl_fsparm *data;
221 struct sockaddr_in *sin;
222 struct auth_domain *clp;
223 int err = 0;
224 struct knfsd_fh *res;
225
226 if (size < sizeof(*data))
227 return -EINVAL;
228 data = (struct nfsctl_fsparm*)buf;
229 err = -EPROTONOSUPPORT;
230 if (data->gd_addr.sa_family != AF_INET)
231 goto out;
232 sin = (struct sockaddr_in *)&data->gd_addr;
233 if (data->gd_maxlen > NFS3_FHSIZE)
234 data->gd_maxlen = NFS3_FHSIZE;
235
236 res = (struct knfsd_fh*)buf;
237
238 exp_readlock();
239 if (!(clp = auth_unix_lookup(sin->sin_addr)))
240 err = -EPERM;
241 else {
242 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
243 auth_domain_put(clp);
244 }
245 exp_readunlock();
246 if (err == 0)
247 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
248 out:
249 return err;
250 }
251
252 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
253 {
254 struct nfsctl_fdparm *data;
255 struct sockaddr_in *sin;
256 struct auth_domain *clp;
257 int err = 0;
258 struct knfsd_fh fh;
259 char *res;
260
261 if (size < sizeof(*data))
262 return -EINVAL;
263 data = (struct nfsctl_fdparm*)buf;
264 err = -EPROTONOSUPPORT;
265 if (data->gd_addr.sa_family != AF_INET)
266 goto out;
267 err = -EINVAL;
268 if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
269 goto out;
270
271 res = buf;
272 sin = (struct sockaddr_in *)&data->gd_addr;
273 exp_readlock();
274 if (!(clp = auth_unix_lookup(sin->sin_addr)))
275 err = -EPERM;
276 else {
277 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
278 auth_domain_put(clp);
279 }
280 exp_readunlock();
281
282 if (err == 0) {
283 memset(res,0, NFS_FHSIZE);
284 memcpy(res, &fh.fh_base, fh.fh_size);
285 err = NFS_FHSIZE;
286 }
287 out:
288 return err;
289 }
290
291 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
292 {
293 /* request is:
294 * domain path maxsize
295 * response is
296 * filehandle
297 *
298 * qword quoting is used, so filehandle will be \x....
299 */
300 char *dname, *path;
301 int uninitialized_var(maxsize);
302 char *mesg = buf;
303 int len;
304 struct auth_domain *dom;
305 struct knfsd_fh fh;
306
307 if (size == 0)
308 return -EINVAL;
309
310 if (buf[size-1] != '\n')
311 return -EINVAL;
312 buf[size-1] = 0;
313
314 dname = mesg;
315 len = qword_get(&mesg, dname, size);
316 if (len <= 0) return -EINVAL;
317
318 path = dname+len+1;
319 len = qword_get(&mesg, path, size);
320 if (len <= 0) return -EINVAL;
321
322 len = get_int(&mesg, &maxsize);
323 if (len)
324 return len;
325
326 if (maxsize < NFS_FHSIZE)
327 return -EINVAL;
328 if (maxsize > NFS3_FHSIZE)
329 maxsize = NFS3_FHSIZE;
330
331 if (qword_get(&mesg, mesg, size)>0)
332 return -EINVAL;
333
334 /* we have all the words, they are in buf.. */
335 dom = unix_domain_find(dname);
336 if (!dom)
337 return -ENOMEM;
338
339 len = exp_rootfh(dom, path, &fh, maxsize);
340 auth_domain_put(dom);
341 if (len)
342 return len;
343
344 mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
345 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
346 mesg[-1] = '\n';
347 return mesg - buf;
348 }
349
350 extern int nfsd_nrthreads(void);
351
352 static ssize_t write_threads(struct file *file, char *buf, size_t size)
353 {
354 /* if size > 0, look for a number of threads and call nfsd_svc
355 * then write out number of threads as reply
356 */
357 char *mesg = buf;
358 int rv;
359 if (size > 0) {
360 int newthreads;
361 rv = get_int(&mesg, &newthreads);
362 if (rv)
363 return rv;
364 if (newthreads <0)
365 return -EINVAL;
366 rv = nfsd_svc(2049, newthreads);
367 if (rv)
368 return rv;
369 }
370 sprintf(buf, "%d\n", nfsd_nrthreads());
371 return strlen(buf);
372 }
373
374 extern int nfsd_nrpools(void);
375 extern int nfsd_get_nrthreads(int n, int *);
376 extern int nfsd_set_nrthreads(int n, int *);
377
378 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
379 {
380 /* if size > 0, look for an array of number of threads per node
381 * and apply them then write out number of threads per node as reply
382 */
383 char *mesg = buf;
384 int i;
385 int rv;
386 int len;
387 int npools = nfsd_nrpools();
388 int *nthreads;
389
390 if (npools == 0) {
391 /*
392 * NFS is shut down. The admin can start it by
393 * writing to the threads file but NOT the pool_threads
394 * file, sorry. Report zero threads.
395 */
396 strcpy(buf, "0\n");
397 return strlen(buf);
398 }
399
400 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
401 if (nthreads == NULL)
402 return -ENOMEM;
403
404 if (size > 0) {
405 for (i = 0; i < npools; i++) {
406 rv = get_int(&mesg, &nthreads[i]);
407 if (rv == -ENOENT)
408 break; /* fewer numbers than pools */
409 if (rv)
410 goto out_free; /* syntax error */
411 rv = -EINVAL;
412 if (nthreads[i] < 0)
413 goto out_free;
414 }
415 rv = nfsd_set_nrthreads(i, nthreads);
416 if (rv)
417 goto out_free;
418 }
419
420 rv = nfsd_get_nrthreads(npools, nthreads);
421 if (rv)
422 goto out_free;
423
424 mesg = buf;
425 size = SIMPLE_TRANSACTION_LIMIT;
426 for (i = 0; i < npools && size > 0; i++) {
427 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
428 len = strlen(mesg);
429 size -= len;
430 mesg += len;
431 }
432
433 return (mesg-buf);
434
435 out_free:
436 kfree(nthreads);
437 return rv;
438 }
439
440 static ssize_t write_versions(struct file *file, char *buf, size_t size)
441 {
442 /*
443 * Format:
444 * [-/+]vers [-/+]vers ...
445 */
446 char *mesg = buf;
447 char *vers, sign;
448 int len, num;
449 ssize_t tlen = 0;
450 char *sep;
451
452 if (size>0) {
453 if (nfsd_serv)
454 /* Cannot change versions without updating
455 * nfsd_serv->sv_xdrsize, and reallocing
456 * rq_argp and rq_resp
457 */
458 return -EBUSY;
459 if (buf[size-1] != '\n')
460 return -EINVAL;
461 buf[size-1] = 0;
462
463 vers = mesg;
464 len = qword_get(&mesg, vers, size);
465 if (len <= 0) return -EINVAL;
466 do {
467 sign = *vers;
468 if (sign == '+' || sign == '-')
469 num = simple_strtol((vers+1), NULL, 0);
470 else
471 num = simple_strtol(vers, NULL, 0);
472 switch(num) {
473 case 2:
474 case 3:
475 case 4:
476 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
477 break;
478 default:
479 return -EINVAL;
480 }
481 vers += len + 1;
482 tlen += len;
483 } while ((len = qword_get(&mesg, vers, size)) > 0);
484 /* If all get turned off, turn them back on, as
485 * having no versions is BAD
486 */
487 nfsd_reset_versions();
488 }
489 /* Now write current state into reply buffer */
490 len = 0;
491 sep = "";
492 for (num=2 ; num <= 4 ; num++)
493 if (nfsd_vers(num, NFSD_AVAIL)) {
494 len += sprintf(buf+len, "%s%c%d", sep,
495 nfsd_vers(num, NFSD_TEST)?'+':'-',
496 num);
497 sep = " ";
498 }
499 len += sprintf(buf+len, "\n");
500 return len;
501 }
502
503 static ssize_t write_ports(struct file *file, char *buf, size_t size)
504 {
505 if (size == 0) {
506 int len = 0;
507 lock_kernel();
508 if (nfsd_serv)
509 len = svc_xprt_names(nfsd_serv, buf, 0);
510 unlock_kernel();
511 return len;
512 }
513 /* Either a single 'fd' number is written, in which
514 * case it must be for a socket of a supported family/protocol,
515 * and we use it as an nfsd socket, or
516 * A '-' followed by the 'name' of a socket in which case
517 * we close the socket.
518 */
519 if (isdigit(buf[0])) {
520 char *mesg = buf;
521 int fd;
522 int err;
523 err = get_int(&mesg, &fd);
524 if (err)
525 return -EINVAL;
526 if (fd < 0)
527 return -EINVAL;
528 err = nfsd_create_serv();
529 if (!err) {
530 int proto = 0;
531 err = svc_addsock(nfsd_serv, fd, buf, &proto);
532 if (err >= 0) {
533 err = lockd_up(proto);
534 if (err < 0)
535 svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
536 }
537 /* Decrease the count, but don't shutdown the
538 * the service
539 */
540 lock_kernel();
541 nfsd_serv->sv_nrthreads--;
542 unlock_kernel();
543 }
544 return err < 0 ? err : 0;
545 }
546 if (buf[0] == '-' && isdigit(buf[1])) {
547 char *toclose = kstrdup(buf+1, GFP_KERNEL);
548 int len = 0;
549 if (!toclose)
550 return -ENOMEM;
551 lock_kernel();
552 if (nfsd_serv)
553 len = svc_sock_names(buf, nfsd_serv, toclose);
554 unlock_kernel();
555 if (len >= 0)
556 lockd_down();
557 kfree(toclose);
558 return len;
559 }
560 /*
561 * Add a transport listener by writing it's transport name
562 */
563 if (isalpha(buf[0])) {
564 int err;
565 char transport[16];
566 int port;
567 if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
568 err = nfsd_create_serv();
569 if (!err) {
570 err = svc_create_xprt(nfsd_serv,
571 transport, port,
572 SVC_SOCK_ANONYMOUS);
573 if (err == -ENOENT)
574 /* Give a reasonable perror msg for
575 * bad transport string */
576 err = -EPROTONOSUPPORT;
577 }
578 return err < 0 ? err : 0;
579 }
580 }
581 /*
582 * Remove a transport by writing it's transport name and port number
583 */
584 if (buf[0] == '-' && isalpha(buf[1])) {
585 struct svc_xprt *xprt;
586 int err = -EINVAL;
587 char transport[16];
588 int port;
589 if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
590 if (port == 0)
591 return -EINVAL;
592 lock_kernel();
593 if (nfsd_serv) {
594 xprt = svc_find_xprt(nfsd_serv, transport,
595 AF_UNSPEC, port);
596 if (xprt) {
597 svc_close_xprt(xprt);
598 svc_xprt_put(xprt);
599 err = 0;
600 } else
601 err = -ENOTCONN;
602 }
603 unlock_kernel();
604 return err < 0 ? err : 0;
605 }
606 }
607 return -EINVAL;
608 }
609
610 int nfsd_max_blksize;
611
612 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
613 {
614 char *mesg = buf;
615 if (size > 0) {
616 int bsize;
617 int rv = get_int(&mesg, &bsize);
618 if (rv)
619 return rv;
620 /* force bsize into allowed range and
621 * required alignment.
622 */
623 if (bsize < 1024)
624 bsize = 1024;
625 if (bsize > NFSSVC_MAXBLKSIZE)
626 bsize = NFSSVC_MAXBLKSIZE;
627 bsize &= ~(1024-1);
628 lock_kernel();
629 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
630 unlock_kernel();
631 return -EBUSY;
632 }
633 nfsd_max_blksize = bsize;
634 unlock_kernel();
635 }
636 return sprintf(buf, "%d\n", nfsd_max_blksize);
637 }
638
639 #ifdef CONFIG_NFSD_V4
640 extern time_t nfs4_leasetime(void);
641
642 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
643 {
644 /* if size > 10 seconds, call
645 * nfs4_reset_lease() then write out the new lease (seconds) as reply
646 */
647 char *mesg = buf;
648 int rv;
649
650 if (size > 0) {
651 int lease;
652 rv = get_int(&mesg, &lease);
653 if (rv)
654 return rv;
655 if (lease < 10 || lease > 3600)
656 return -EINVAL;
657 nfs4_reset_lease(lease);
658 }
659 sprintf(buf, "%ld\n", nfs4_lease_time());
660 return strlen(buf);
661 }
662
663 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
664 {
665 char *mesg = buf;
666 char *recdir;
667 int len, status;
668
669 if (size == 0 || size > PATH_MAX || buf[size-1] != '\n')
670 return -EINVAL;
671 buf[size-1] = 0;
672
673 recdir = mesg;
674 len = qword_get(&mesg, recdir, size);
675 if (len <= 0)
676 return -EINVAL;
677
678 status = nfs4_reset_recoverydir(recdir);
679 return strlen(buf);
680 }
681 #endif
682
683 /*----------------------------------------------------------------------------*/
684 /*
685 * populating the filesystem.
686 */
687
688 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
689 {
690 static struct tree_descr nfsd_files[] = {
691 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
692 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
693 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
694 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
695 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
696 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
697 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
698 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
699 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
700 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
701 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
702 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
703 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
704 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
705 #ifdef CONFIG_NFSD_V4
706 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
707 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
708 #endif
709 /* last one */ {""}
710 };
711 return simple_fill_super(sb, 0x6e667364, nfsd_files);
712 }
713
714 static int nfsd_get_sb(struct file_system_type *fs_type,
715 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
716 {
717 return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
718 }
719
720 static struct file_system_type nfsd_fs_type = {
721 .owner = THIS_MODULE,
722 .name = "nfsd",
723 .get_sb = nfsd_get_sb,
724 .kill_sb = kill_litter_super,
725 };
726
727 #ifdef CONFIG_PROC_FS
728 static int create_proc_exports_entry(void)
729 {
730 struct proc_dir_entry *entry;
731
732 entry = proc_mkdir("fs/nfs", NULL);
733 if (!entry)
734 return -ENOMEM;
735 entry = create_proc_entry("fs/nfs/exports", 0, NULL);
736 if (!entry)
737 return -ENOMEM;
738 entry->proc_fops = &exports_operations;
739 return 0;
740 }
741 #else /* CONFIG_PROC_FS */
742 static int create_proc_exports_entry(void)
743 {
744 return 0;
745 }
746 #endif
747
748 static int __init init_nfsd(void)
749 {
750 int retval;
751 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
752
753 retval = nfs4_state_init(); /* nfs4 locking state */
754 if (retval)
755 return retval;
756 nfsd_stat_init(); /* Statistics */
757 retval = nfsd_reply_cache_init();
758 if (retval)
759 goto out_free_stat;
760 retval = nfsd_export_init();
761 if (retval)
762 goto out_free_cache;
763 nfsd_lockd_init(); /* lockd->nfsd callbacks */
764 retval = nfsd_idmap_init();
765 if (retval)
766 goto out_free_lockd;
767 retval = create_proc_exports_entry();
768 if (retval)
769 goto out_free_idmap;
770 retval = register_filesystem(&nfsd_fs_type);
771 if (retval)
772 goto out_free_all;
773 return 0;
774 out_free_all:
775 remove_proc_entry("fs/nfs/exports", NULL);
776 remove_proc_entry("fs/nfs", NULL);
777 out_free_idmap:
778 nfsd_idmap_shutdown();
779 out_free_lockd:
780 nfsd_lockd_shutdown();
781 nfsd_export_shutdown();
782 out_free_cache:
783 nfsd_reply_cache_shutdown();
784 out_free_stat:
785 nfsd_stat_shutdown();
786 nfsd4_free_slabs();
787 return retval;
788 }
789
790 static void __exit exit_nfsd(void)
791 {
792 nfsd_export_shutdown();
793 nfsd_reply_cache_shutdown();
794 remove_proc_entry("fs/nfs/exports", NULL);
795 remove_proc_entry("fs/nfs", NULL);
796 nfsd_stat_shutdown();
797 nfsd_lockd_shutdown();
798 nfsd_idmap_shutdown();
799 nfsd4_free_slabs();
800 unregister_filesystem(&nfsd_fs_type);
801 }
802
803 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
804 MODULE_LICENSE("GPL");
805 module_init(init_nfsd)
806 module_exit(exit_nfsd)
WRT350N Kernel Patches