Merge branches 'release' and 'throttling-domains' into release
[linux-2.6] / fs / nfsd / nfsctl.c
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)