xref: /openbmc/linux/fs/nfsd/nfsctl.c (revision c21b37f6)
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 maxsize;
302 	char *mesg = buf;
303 	int len;
304 	struct auth_domain *dom;
305 	struct knfsd_fh fh;
306 
307 	if (buf[size-1] != '\n')
308 		return -EINVAL;
309 	buf[size-1] = 0;
310 
311 	dname = mesg;
312 	len = qword_get(&mesg, dname, size);
313 	if (len <= 0) return -EINVAL;
314 
315 	path = dname+len+1;
316 	len = qword_get(&mesg, path, size);
317 	if (len <= 0) return -EINVAL;
318 
319 	len = get_int(&mesg, &maxsize);
320 	if (len)
321 		return len;
322 
323 	if (maxsize < NFS_FHSIZE)
324 		return -EINVAL;
325 	if (maxsize > NFS3_FHSIZE)
326 		maxsize = NFS3_FHSIZE;
327 
328 	if (qword_get(&mesg, mesg, size)>0)
329 		return -EINVAL;
330 
331 	/* we have all the words, they are in buf.. */
332 	dom = unix_domain_find(dname);
333 	if (!dom)
334 		return -ENOMEM;
335 
336 	len = exp_rootfh(dom, path, &fh,  maxsize);
337 	auth_domain_put(dom);
338 	if (len)
339 		return len;
340 
341 	mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
342 	qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
343 	mesg[-1] = '\n';
344 	return mesg - buf;
345 }
346 
347 extern int nfsd_nrthreads(void);
348 
349 static ssize_t write_threads(struct file *file, char *buf, size_t size)
350 {
351 	/* if size > 0, look for a number of threads and call nfsd_svc
352 	 * then write out number of threads as reply
353 	 */
354 	char *mesg = buf;
355 	int rv;
356 	if (size > 0) {
357 		int newthreads;
358 		rv = get_int(&mesg, &newthreads);
359 		if (rv)
360 			return rv;
361 		if (newthreads <0)
362 			return -EINVAL;
363 		rv = nfsd_svc(2049, newthreads);
364 		if (rv)
365 			return rv;
366 	}
367 	sprintf(buf, "%d\n", nfsd_nrthreads());
368 	return strlen(buf);
369 }
370 
371 extern int nfsd_nrpools(void);
372 extern int nfsd_get_nrthreads(int n, int *);
373 extern int nfsd_set_nrthreads(int n, int *);
374 
375 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
376 {
377 	/* if size > 0, look for an array of number of threads per node
378 	 * and apply them  then write out number of threads per node as reply
379 	 */
380 	char *mesg = buf;
381 	int i;
382 	int rv;
383 	int len;
384     	int npools = nfsd_nrpools();
385 	int *nthreads;
386 
387 	if (npools == 0) {
388 		/*
389 		 * NFS is shut down.  The admin can start it by
390 		 * writing to the threads file but NOT the pool_threads
391 		 * file, sorry.  Report zero threads.
392 		 */
393 		strcpy(buf, "0\n");
394 		return strlen(buf);
395 	}
396 
397 	nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
398 	if (nthreads == NULL)
399 		return -ENOMEM;
400 
401 	if (size > 0) {
402 		for (i = 0; i < npools; i++) {
403 			rv = get_int(&mesg, &nthreads[i]);
404 			if (rv == -ENOENT)
405 				break;		/* fewer numbers than pools */
406 			if (rv)
407 				goto out_free;	/* syntax error */
408 			rv = -EINVAL;
409 			if (nthreads[i] < 0)
410 				goto out_free;
411 		}
412 		rv = nfsd_set_nrthreads(i, nthreads);
413 		if (rv)
414 			goto out_free;
415 	}
416 
417 	rv = nfsd_get_nrthreads(npools, nthreads);
418 	if (rv)
419 		goto out_free;
420 
421 	mesg = buf;
422 	size = SIMPLE_TRANSACTION_LIMIT;
423 	for (i = 0; i < npools && size > 0; i++) {
424 		snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
425 		len = strlen(mesg);
426 		size -= len;
427 		mesg += len;
428 	}
429 
430 	return (mesg-buf);
431 
432 out_free:
433 	kfree(nthreads);
434 	return rv;
435 }
436 
437 static ssize_t write_versions(struct file *file, char *buf, size_t size)
438 {
439 	/*
440 	 * Format:
441 	 *   [-/+]vers [-/+]vers ...
442 	 */
443 	char *mesg = buf;
444 	char *vers, sign;
445 	int len, num;
446 	ssize_t tlen = 0;
447 	char *sep;
448 
449 	if (size>0) {
450 		if (nfsd_serv)
451 			/* Cannot change versions without updating
452 			 * nfsd_serv->sv_xdrsize, and reallocing
453 			 * rq_argp and rq_resp
454 			 */
455 			return -EBUSY;
456 		if (buf[size-1] != '\n')
457 			return -EINVAL;
458 		buf[size-1] = 0;
459 
460 		vers = mesg;
461 		len = qword_get(&mesg, vers, size);
462 		if (len <= 0) return -EINVAL;
463 		do {
464 			sign = *vers;
465 			if (sign == '+' || sign == '-')
466 				num = simple_strtol((vers+1), NULL, 0);
467 			else
468 				num = simple_strtol(vers, NULL, 0);
469 			switch(num) {
470 			case 2:
471 			case 3:
472 			case 4:
473 				nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
474 				break;
475 			default:
476 				return -EINVAL;
477 			}
478 			vers += len + 1;
479 			tlen += len;
480 		} while ((len = qword_get(&mesg, vers, size)) > 0);
481 		/* If all get turned off, turn them back on, as
482 		 * having no versions is BAD
483 		 */
484 		nfsd_reset_versions();
485 	}
486 	/* Now write current state into reply buffer */
487 	len = 0;
488 	sep = "";
489 	for (num=2 ; num <= 4 ; num++)
490 		if (nfsd_vers(num, NFSD_AVAIL)) {
491 			len += sprintf(buf+len, "%s%c%d", sep,
492 				       nfsd_vers(num, NFSD_TEST)?'+':'-',
493 				       num);
494 			sep = " ";
495 		}
496 	len += sprintf(buf+len, "\n");
497 	return len;
498 }
499 
500 static ssize_t write_ports(struct file *file, char *buf, size_t size)
501 {
502 	if (size == 0) {
503 		int len = 0;
504 		lock_kernel();
505 		if (nfsd_serv)
506 			len = svc_sock_names(buf, nfsd_serv, NULL);
507 		unlock_kernel();
508 		return len;
509 	}
510 	/* Either a single 'fd' number is written, in which
511 	 * case it must be for a socket of a supported family/protocol,
512 	 * and we use it as an nfsd socket, or
513 	 * A '-' followed by the 'name' of a socket in which case
514 	 * we close the socket.
515 	 */
516 	if (isdigit(buf[0])) {
517 		char *mesg = buf;
518 		int fd;
519 		int err;
520 		err = get_int(&mesg, &fd);
521 		if (err)
522 			return -EINVAL;
523 		if (fd < 0)
524 			return -EINVAL;
525 		err = nfsd_create_serv();
526 		if (!err) {
527 			int proto = 0;
528 			err = svc_addsock(nfsd_serv, fd, buf, &proto);
529 			if (err >= 0) {
530 				err = lockd_up(proto);
531 				if (err < 0)
532 					svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
533 			}
534 			/* Decrease the count, but don't shutdown the
535 			 * the service
536 			 */
537 			lock_kernel();
538 			nfsd_serv->sv_nrthreads--;
539 			unlock_kernel();
540 		}
541 		return err < 0 ? err : 0;
542 	}
543 	if (buf[0] == '-') {
544 		char *toclose = kstrdup(buf+1, GFP_KERNEL);
545 		int len = 0;
546 		if (!toclose)
547 			return -ENOMEM;
548 		lock_kernel();
549 		if (nfsd_serv)
550 			len = svc_sock_names(buf, nfsd_serv, toclose);
551 		unlock_kernel();
552 		if (len >= 0)
553 			lockd_down();
554 		kfree(toclose);
555 		return len;
556 	}
557 	return -EINVAL;
558 }
559 
560 int nfsd_max_blksize;
561 
562 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
563 {
564 	char *mesg = buf;
565 	if (size > 0) {
566 		int bsize;
567 		int rv = get_int(&mesg, &bsize);
568 		if (rv)
569 			return rv;
570 		/* force bsize into allowed range and
571 		 * required alignment.
572 		 */
573 		if (bsize < 1024)
574 			bsize = 1024;
575 		if (bsize > NFSSVC_MAXBLKSIZE)
576 			bsize = NFSSVC_MAXBLKSIZE;
577 		bsize &= ~(1024-1);
578 		lock_kernel();
579 		if (nfsd_serv && nfsd_serv->sv_nrthreads) {
580 			unlock_kernel();
581 			return -EBUSY;
582 		}
583 		nfsd_max_blksize = bsize;
584 		unlock_kernel();
585 	}
586 	return sprintf(buf, "%d\n", nfsd_max_blksize);
587 }
588 
589 #ifdef CONFIG_NFSD_V4
590 extern time_t nfs4_leasetime(void);
591 
592 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
593 {
594 	/* if size > 10 seconds, call
595 	 * nfs4_reset_lease() then write out the new lease (seconds) as reply
596 	 */
597 	char *mesg = buf;
598 	int rv;
599 
600 	if (size > 0) {
601 		int lease;
602 		rv = get_int(&mesg, &lease);
603 		if (rv)
604 			return rv;
605 		if (lease < 10 || lease > 3600)
606 			return -EINVAL;
607 		nfs4_reset_lease(lease);
608 	}
609 	sprintf(buf, "%ld\n", nfs4_lease_time());
610 	return strlen(buf);
611 }
612 
613 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
614 {
615 	char *mesg = buf;
616 	char *recdir;
617 	int len, status;
618 
619 	if (size > PATH_MAX || buf[size-1] != '\n')
620 		return -EINVAL;
621 	buf[size-1] = 0;
622 
623 	recdir = mesg;
624 	len = qword_get(&mesg, recdir, size);
625 	if (len <= 0)
626 		return -EINVAL;
627 
628 	status = nfs4_reset_recoverydir(recdir);
629 	return strlen(buf);
630 }
631 #endif
632 
633 /*----------------------------------------------------------------------------*/
634 /*
635  *	populating the filesystem.
636  */
637 
638 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
639 {
640 	static struct tree_descr nfsd_files[] = {
641 		[NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
642 		[NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
643 		[NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
644 		[NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
645 		[NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
646 		[NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
647 		[NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
648 		[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
649 		[NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
650 		[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
651 		[NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
652 		[NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
653 		[NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
654 		[NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
655 #ifdef CONFIG_NFSD_V4
656 		[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
657 		[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
658 #endif
659 		/* last one */ {""}
660 	};
661 	return simple_fill_super(sb, 0x6e667364, nfsd_files);
662 }
663 
664 static int nfsd_get_sb(struct file_system_type *fs_type,
665 	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
666 {
667 	return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
668 }
669 
670 static struct file_system_type nfsd_fs_type = {
671 	.owner		= THIS_MODULE,
672 	.name		= "nfsd",
673 	.get_sb		= nfsd_get_sb,
674 	.kill_sb	= kill_litter_super,
675 };
676 
677 static int __init init_nfsd(void)
678 {
679 	int retval;
680 	printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
681 
682 	nfsd_stat_init();	/* Statistics */
683 	nfsd_cache_init();	/* RPC reply cache */
684 	nfsd_export_init();	/* Exports table */
685 	nfsd_lockd_init();	/* lockd->nfsd callbacks */
686 	nfs4_state_init();	/* NFSv4 locking state */
687 	nfsd_idmap_init();      /* Name to ID mapping */
688 	if (proc_mkdir("fs/nfs", NULL)) {
689 		struct proc_dir_entry *entry;
690 		entry = create_proc_entry("fs/nfs/exports", 0, NULL);
691 		if (entry)
692 			entry->proc_fops =  &exports_operations;
693 	}
694 	retval = register_filesystem(&nfsd_fs_type);
695 	if (retval) {
696 		nfsd_export_shutdown();
697 		nfsd_cache_shutdown();
698 		remove_proc_entry("fs/nfs/exports", NULL);
699 		remove_proc_entry("fs/nfs", NULL);
700 		nfsd_stat_shutdown();
701 		nfsd_lockd_shutdown();
702 	}
703 	return retval;
704 }
705 
706 static void __exit exit_nfsd(void)
707 {
708 	nfsd_export_shutdown();
709 	nfsd_cache_shutdown();
710 	remove_proc_entry("fs/nfs/exports", NULL);
711 	remove_proc_entry("fs/nfs", NULL);
712 	nfsd_stat_shutdown();
713 	nfsd_lockd_shutdown();
714 	nfsd_idmap_shutdown();
715 	unregister_filesystem(&nfsd_fs_type);
716 }
717 
718 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
719 MODULE_LICENSE("GPL");
720 module_init(init_nfsd)
721 module_exit(exit_nfsd)
722