Merge branch 'for-2.6.31' of git://fieldses.org/git/linux-nfsd
[linux-2.6.git] / 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/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_Pool_Stats,
64         NFSD_Versions,
65         NFSD_Ports,
66         NFSD_MaxBlkSize,
67         /*
68          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
69          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
70          */
71 #ifdef CONFIG_NFSD_V4
72         NFSD_Leasetime,
73         NFSD_RecoveryDir,
74 #endif
75 };
76
77 /*
78  * write() for these nodes.
79  */
80 static ssize_t write_svc(struct file *file, char *buf, size_t size);
81 static ssize_t write_add(struct file *file, char *buf, size_t size);
82 static ssize_t write_del(struct file *file, char *buf, size_t size);
83 static ssize_t write_export(struct file *file, char *buf, size_t size);
84 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
85 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
86 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
87 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
88 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
89 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
90 static ssize_t write_threads(struct file *file, char *buf, size_t size);
91 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
92 static ssize_t write_versions(struct file *file, char *buf, size_t size);
93 static ssize_t write_ports(struct file *file, char *buf, size_t size);
94 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
95 #ifdef CONFIG_NFSD_V4
96 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
97 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
98 #endif
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] = write_unlock_ip,
110         [NFSD_FO_UnlockFS] = write_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 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
177
178 static struct file_operations pool_stats_operations = {
179         .open           = nfsd_pool_stats_open,
180         .read           = seq_read,
181         .llseek         = seq_lseek,
182         .release        = seq_release,
183         .owner          = THIS_MODULE,
184 };
185
186 /*----------------------------------------------------------------------------*/
187 /*
188  * payload - write methods
189  */
190
191 /**
192  * write_svc - Start kernel's NFSD server
193  *
194  * Deprecated.  /proc/fs/nfsd/threads is preferred.
195  * Function remains to support old versions of nfs-utils.
196  *
197  * Input:
198  *                      buf:    struct nfsctl_svc
199  *                              svc_port:       port number of this
200  *                                              server's listener
201  *                              svc_nthreads:   number of threads to start
202  *                      size:   size in bytes of passed in nfsctl_svc
203  * Output:
204  *      On success:     returns zero
205  *      On error:       return code is negative errno value
206  */
207 static ssize_t write_svc(struct file *file, char *buf, size_t size)
208 {
209         struct nfsctl_svc *data;
210         int err;
211         if (size < sizeof(*data))
212                 return -EINVAL;
213         data = (struct nfsctl_svc*) buf;
214         err = nfsd_svc(data->svc_port, data->svc_nthreads);
215         if (err < 0)
216                 return err;
217         return 0;
218 }
219
220 /**
221  * write_add - Add or modify client entry in auth unix cache
222  *
223  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
224  * Function remains to support old versions of nfs-utils.
225  *
226  * Input:
227  *                      buf:    struct nfsctl_client
228  *                              cl_ident:       '\0'-terminated C string
229  *                                              containing domain name
230  *                                              of client
231  *                              cl_naddr:       no. of items in cl_addrlist
232  *                              cl_addrlist:    array of client addresses
233  *                              cl_fhkeytype:   ignored
234  *                              cl_fhkeylen:    ignored
235  *                              cl_fhkey:       ignored
236  *                      size:   size in bytes of passed in nfsctl_client
237  * Output:
238  *      On success:     returns zero
239  *      On error:       return code is negative errno value
240  *
241  * Note: Only AF_INET client addresses are passed in, since
242  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
243  */
244 static ssize_t write_add(struct file *file, char *buf, size_t size)
245 {
246         struct nfsctl_client *data;
247         if (size < sizeof(*data))
248                 return -EINVAL;
249         data = (struct nfsctl_client *)buf;
250         return exp_addclient(data);
251 }
252
253 /**
254  * write_del - Remove client from auth unix cache
255  *
256  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
257  * Function remains to support old versions of nfs-utils.
258  *
259  * Input:
260  *                      buf:    struct nfsctl_client
261  *                              cl_ident:       '\0'-terminated C string
262  *                                              containing domain name
263  *                                              of client
264  *                              cl_naddr:       ignored
265  *                              cl_addrlist:    ignored
266  *                              cl_fhkeytype:   ignored
267  *                              cl_fhkeylen:    ignored
268  *                              cl_fhkey:       ignored
269  *                      size:   size in bytes of passed in nfsctl_client
270  * Output:
271  *      On success:     returns zero
272  *      On error:       return code is negative errno value
273  *
274  * Note: Only AF_INET client addresses are passed in, since
275  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
276  */
277 static ssize_t write_del(struct file *file, char *buf, size_t size)
278 {
279         struct nfsctl_client *data;
280         if (size < sizeof(*data))
281                 return -EINVAL;
282         data = (struct nfsctl_client *)buf;
283         return exp_delclient(data);
284 }
285
286 /**
287  * write_export - Export part or all of a local file system
288  *
289  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
290  * Function remains to support old versions of nfs-utils.
291  *
292  * Input:
293  *                      buf:    struct nfsctl_export
294  *                              ex_client:      '\0'-terminated C string
295  *                                              containing domain name
296  *                                              of client allowed to access
297  *                                              this export
298  *                              ex_path:        '\0'-terminated C string
299  *                                              containing pathname of
300  *                                              directory in local file system
301  *                              ex_dev:         fsid to use for this export
302  *                              ex_ino:         ignored
303  *                              ex_flags:       export flags for this export
304  *                              ex_anon_uid:    UID to use for anonymous
305  *                                              requests
306  *                              ex_anon_gid:    GID to use for anonymous
307  *                                              requests
308  *                      size:   size in bytes of passed in nfsctl_export
309  * Output:
310  *      On success:     returns zero
311  *      On error:       return code is negative errno value
312  */
313 static ssize_t write_export(struct file *file, char *buf, size_t size)
314 {
315         struct nfsctl_export *data;
316         if (size < sizeof(*data))
317                 return -EINVAL;
318         data = (struct nfsctl_export*)buf;
319         return exp_export(data);
320 }
321
322 /**
323  * write_unexport - Unexport a previously exported file system
324  *
325  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
326  * Function remains to support old versions of nfs-utils.
327  *
328  * Input:
329  *                      buf:    struct nfsctl_export
330  *                              ex_client:      '\0'-terminated C string
331  *                                              containing domain name
332  *                                              of client no longer allowed
333  *                                              to access this export
334  *                              ex_path:        '\0'-terminated C string
335  *                                              containing pathname of
336  *                                              directory in local file system
337  *                              ex_dev:         ignored
338  *                              ex_ino:         ignored
339  *                              ex_flags:       ignored
340  *                              ex_anon_uid:    ignored
341  *                              ex_anon_gid:    ignored
342  *                      size:   size in bytes of passed in nfsctl_export
343  * Output:
344  *      On success:     returns zero
345  *      On error:       return code is negative errno value
346  */
347 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
348 {
349         struct nfsctl_export *data;
350
351         if (size < sizeof(*data))
352                 return -EINVAL;
353         data = (struct nfsctl_export*)buf;
354         return exp_unexport(data);
355 }
356
357 /**
358  * write_getfs - Get a variable-length NFS file handle by path
359  *
360  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
361  * Function remains to support old versions of nfs-utils.
362  *
363  * Input:
364  *                      buf:    struct nfsctl_fsparm
365  *                              gd_addr:        socket address of client
366  *                              gd_path:        '\0'-terminated C string
367  *                                              containing pathname of
368  *                                              directory in local file system
369  *                              gd_maxlen:      maximum size of returned file
370  *                                              handle
371  *                      size:   size in bytes of passed in nfsctl_fsparm
372  * Output:
373  *      On success:     passed-in buffer filled with a knfsd_fh structure
374  *                      (a variable-length raw NFS file handle);
375  *                      return code is the size in bytes of the file handle
376  *      On error:       return code is negative errno value
377  *
378  * Note: Only AF_INET client addresses are passed in, since gd_addr
379  * is the same size as a struct sockaddr_in.
380  */
381 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
382 {
383         struct nfsctl_fsparm *data;
384         struct sockaddr_in *sin;
385         struct auth_domain *clp;
386         int err = 0;
387         struct knfsd_fh *res;
388         struct in6_addr in6;
389
390         if (size < sizeof(*data))
391                 return -EINVAL;
392         data = (struct nfsctl_fsparm*)buf;
393         err = -EPROTONOSUPPORT;
394         if (data->gd_addr.sa_family != AF_INET)
395                 goto out;
396         sin = (struct sockaddr_in *)&data->gd_addr;
397         if (data->gd_maxlen > NFS3_FHSIZE)
398                 data->gd_maxlen = NFS3_FHSIZE;
399
400         res = (struct knfsd_fh*)buf;
401
402         exp_readlock();
403
404         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
405
406         clp = auth_unix_lookup(&in6);
407         if (!clp)
408                 err = -EPERM;
409         else {
410                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
411                 auth_domain_put(clp);
412         }
413         exp_readunlock();
414         if (err == 0)
415                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
416  out:
417         return err;
418 }
419
420 /**
421  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
422  *
423  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
424  * Function remains to support old versions of nfs-utils.
425  *
426  * Input:
427  *                      buf:    struct nfsctl_fdparm
428  *                              gd_addr:        socket address of client
429  *                              gd_path:        '\0'-terminated C string
430  *                                              containing pathname of
431  *                                              directory in local file system
432  *                              gd_version:     fdparm structure version
433  *                      size:   size in bytes of passed in nfsctl_fdparm
434  * Output:
435  *      On success:     passed-in buffer filled with nfsctl_res
436  *                      (a fixed-length raw NFS file handle);
437  *                      return code is the size in bytes of the file handle
438  *      On error:       return code is negative errno value
439  *
440  * Note: Only AF_INET client addresses are passed in, since gd_addr
441  * is the same size as a struct sockaddr_in.
442  */
443 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
444 {
445         struct nfsctl_fdparm *data;
446         struct sockaddr_in *sin;
447         struct auth_domain *clp;
448         int err = 0;
449         struct knfsd_fh fh;
450         char *res;
451         struct in6_addr in6;
452
453         if (size < sizeof(*data))
454                 return -EINVAL;
455         data = (struct nfsctl_fdparm*)buf;
456         err = -EPROTONOSUPPORT;
457         if (data->gd_addr.sa_family != AF_INET)
458                 goto out;
459         err = -EINVAL;
460         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
461                 goto out;
462
463         res = buf;
464         sin = (struct sockaddr_in *)&data->gd_addr;
465         exp_readlock();
466
467         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
468
469         clp = auth_unix_lookup(&in6);
470         if (!clp)
471                 err = -EPERM;
472         else {
473                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
474                 auth_domain_put(clp);
475         }
476         exp_readunlock();
477
478         if (err == 0) {
479                 memset(res,0, NFS_FHSIZE);
480                 memcpy(res, &fh.fh_base, fh.fh_size);
481                 err = NFS_FHSIZE;
482         }
483  out:
484         return err;
485 }
486
487 /**
488  * write_unlock_ip - Release all locks used by a client
489  *
490  * Experimental.
491  *
492  * Input:
493  *                      buf:    '\n'-terminated C string containing a
494  *                              presentation format IPv4 address
495  *                      size:   length of C string in @buf
496  * Output:
497  *      On success:     returns zero if all specified locks were released;
498  *                      returns one if one or more locks were not released
499  *      On error:       return code is negative errno value
500  *
501  * Note: Only AF_INET client addresses are passed in
502  */
503 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
504 {
505         struct sockaddr_in sin = {
506                 .sin_family     = AF_INET,
507         };
508         int b1, b2, b3, b4;
509         char c;
510         char *fo_path;
511
512         /* sanity check */
513         if (size == 0)
514                 return -EINVAL;
515
516         if (buf[size-1] != '\n')
517                 return -EINVAL;
518
519         fo_path = buf;
520         if (qword_get(&buf, fo_path, size) < 0)
521                 return -EINVAL;
522
523         /* get ipv4 address */
524         if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
525                 return -EINVAL;
526         if (b1 > 255 || b2 > 255 || b3 > 255 || b4 > 255)
527                 return -EINVAL;
528         sin.sin_addr.s_addr = htonl((b1 << 24) | (b2 << 16) | (b3 << 8) | b4);
529
530         return nlmsvc_unlock_all_by_ip((struct sockaddr *)&sin);
531 }
532
533 /**
534  * write_unlock_fs - Release all locks on a local file system
535  *
536  * Experimental.
537  *
538  * Input:
539  *                      buf:    '\n'-terminated C string containing the
540  *                              absolute pathname of a local file system
541  *                      size:   length of C string in @buf
542  * Output:
543  *      On success:     returns zero if all specified locks were released;
544  *                      returns one if one or more locks were not released
545  *      On error:       return code is negative errno value
546  */
547 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
548 {
549         struct path path;
550         char *fo_path;
551         int error;
552
553         /* sanity check */
554         if (size == 0)
555                 return -EINVAL;
556
557         if (buf[size-1] != '\n')
558                 return -EINVAL;
559
560         fo_path = buf;
561         if (qword_get(&buf, fo_path, size) < 0)
562                 return -EINVAL;
563
564         error = kern_path(fo_path, 0, &path);
565         if (error)
566                 return error;
567
568         /*
569          * XXX: Needs better sanity checking.  Otherwise we could end up
570          * releasing locks on the wrong file system.
571          *
572          * For example:
573          * 1.  Does the path refer to a directory?
574          * 2.  Is that directory a mount point, or
575          * 3.  Is that directory the root of an exported file system?
576          */
577         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
578
579         path_put(&path);
580         return error;
581 }
582
583 /**
584  * write_filehandle - Get a variable-length NFS file handle by path
585  *
586  * On input, the buffer contains a '\n'-terminated C string comprised of
587  * three alphanumeric words separated by whitespace.  The string may
588  * contain escape sequences.
589  *
590  * Input:
591  *                      buf:
592  *                              domain:         client domain name
593  *                              path:           export pathname
594  *                              maxsize:        numeric maximum size of
595  *                                              @buf
596  *                      size:   length of C string in @buf
597  * Output:
598  *      On success:     passed-in buffer filled with '\n'-terminated C
599  *                      string containing a ASCII hex text version
600  *                      of the NFS file handle;
601  *                      return code is the size in bytes of the string
602  *      On error:       return code is negative errno value
603  */
604 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
605 {
606         char *dname, *path;
607         int uninitialized_var(maxsize);
608         char *mesg = buf;
609         int len;
610         struct auth_domain *dom;
611         struct knfsd_fh fh;
612
613         if (size == 0)
614                 return -EINVAL;
615
616         if (buf[size-1] != '\n')
617                 return -EINVAL;
618         buf[size-1] = 0;
619
620         dname = mesg;
621         len = qword_get(&mesg, dname, size);
622         if (len <= 0)
623                 return -EINVAL;
624         
625         path = dname+len+1;
626         len = qword_get(&mesg, path, size);
627         if (len <= 0)
628                 return -EINVAL;
629
630         len = get_int(&mesg, &maxsize);
631         if (len)
632                 return len;
633
634         if (maxsize < NFS_FHSIZE)
635                 return -EINVAL;
636         if (maxsize > NFS3_FHSIZE)
637                 maxsize = NFS3_FHSIZE;
638
639         if (qword_get(&mesg, mesg, size)>0)
640                 return -EINVAL;
641
642         /* we have all the words, they are in buf.. */
643         dom = unix_domain_find(dname);
644         if (!dom)
645                 return -ENOMEM;
646
647         len = exp_rootfh(dom, path, &fh,  maxsize);
648         auth_domain_put(dom);
649         if (len)
650                 return len;
651         
652         mesg = buf;
653         len = SIMPLE_TRANSACTION_LIMIT;
654         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
655         mesg[-1] = '\n';
656         return mesg - buf;      
657 }
658
659 /**
660  * write_threads - Start NFSD, or report the current number of running threads
661  *
662  * Input:
663  *                      buf:            ignored
664  *                      size:           zero
665  * Output:
666  *      On success:     passed-in buffer filled with '\n'-terminated C
667  *                      string numeric value representing the number of
668  *                      running NFSD threads;
669  *                      return code is the size in bytes of the string
670  *      On error:       return code is zero
671  *
672  * OR
673  *
674  * Input:
675  *                      buf:            C string containing an unsigned
676  *                                      integer value representing the
677  *                                      number of NFSD threads to start
678  *                      size:           non-zero length of C string in @buf
679  * Output:
680  *      On success:     NFS service is started;
681  *                      passed-in buffer filled with '\n'-terminated C
682  *                      string numeric value representing the number of
683  *                      running NFSD threads;
684  *                      return code is the size in bytes of the string
685  *      On error:       return code is zero or a negative errno value
686  */
687 static ssize_t write_threads(struct file *file, char *buf, size_t size)
688 {
689         char *mesg = buf;
690         int rv;
691         if (size > 0) {
692                 int newthreads;
693                 rv = get_int(&mesg, &newthreads);
694                 if (rv)
695                         return rv;
696                 if (newthreads < 0)
697                         return -EINVAL;
698                 rv = nfsd_svc(NFS_PORT, newthreads);
699                 if (rv < 0)
700                         return rv;
701         } else
702                 rv = nfsd_nrthreads();
703
704         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
705 }
706
707 /**
708  * write_pool_threads - Set or report the current number of threads per pool
709  *
710  * Input:
711  *                      buf:            ignored
712  *                      size:           zero
713  *
714  * OR
715  *
716  * Input:
717  *                      buf:            C string containing whitespace-
718  *                                      separated unsigned integer values
719  *                                      representing the number of NFSD
720  *                                      threads to start in each pool
721  *                      size:           non-zero length of C string in @buf
722  * Output:
723  *      On success:     passed-in buffer filled with '\n'-terminated C
724  *                      string containing integer values representing the
725  *                      number of NFSD threads in each pool;
726  *                      return code is the size in bytes of the string
727  *      On error:       return code is zero or a negative errno value
728  */
729 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
730 {
731         /* if size > 0, look for an array of number of threads per node
732          * and apply them  then write out number of threads per node as reply
733          */
734         char *mesg = buf;
735         int i;
736         int rv;
737         int len;
738         int npools;
739         int *nthreads;
740
741         mutex_lock(&nfsd_mutex);
742         npools = nfsd_nrpools();
743         if (npools == 0) {
744                 /*
745                  * NFS is shut down.  The admin can start it by
746                  * writing to the threads file but NOT the pool_threads
747                  * file, sorry.  Report zero threads.
748                  */
749                 mutex_unlock(&nfsd_mutex);
750                 strcpy(buf, "0\n");
751                 return strlen(buf);
752         }
753
754         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
755         rv = -ENOMEM;
756         if (nthreads == NULL)
757                 goto out_free;
758
759         if (size > 0) {
760                 for (i = 0; i < npools; i++) {
761                         rv = get_int(&mesg, &nthreads[i]);
762                         if (rv == -ENOENT)
763                                 break;          /* fewer numbers than pools */
764                         if (rv)
765                                 goto out_free;  /* syntax error */
766                         rv = -EINVAL;
767                         if (nthreads[i] < 0)
768                                 goto out_free;
769                 }
770                 rv = nfsd_set_nrthreads(i, nthreads);
771                 if (rv)
772                         goto out_free;
773         }
774
775         rv = nfsd_get_nrthreads(npools, nthreads);
776         if (rv)
777                 goto out_free;
778
779         mesg = buf;
780         size = SIMPLE_TRANSACTION_LIMIT;
781         for (i = 0; i < npools && size > 0; i++) {
782                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
783                 len = strlen(mesg);
784                 size -= len;
785                 mesg += len;
786         }
787
788         mutex_unlock(&nfsd_mutex);
789         return (mesg-buf);
790
791 out_free:
792         kfree(nthreads);
793         mutex_unlock(&nfsd_mutex);
794         return rv;
795 }
796
797 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
798 {
799         char *mesg = buf;
800         char *vers, *minorp, sign;
801         int len, num, remaining;
802         unsigned minor;
803         ssize_t tlen = 0;
804         char *sep;
805
806         if (size>0) {
807                 if (nfsd_serv)
808                         /* Cannot change versions without updating
809                          * nfsd_serv->sv_xdrsize, and reallocing
810                          * rq_argp and rq_resp
811                          */
812                         return -EBUSY;
813                 if (buf[size-1] != '\n')
814                         return -EINVAL;
815                 buf[size-1] = 0;
816
817                 vers = mesg;
818                 len = qword_get(&mesg, vers, size);
819                 if (len <= 0) return -EINVAL;
820                 do {
821                         sign = *vers;
822                         if (sign == '+' || sign == '-')
823                                 num = simple_strtol((vers+1), &minorp, 0);
824                         else
825                                 num = simple_strtol(vers, &minorp, 0);
826                         if (*minorp == '.') {
827                                 if (num < 4)
828                                         return -EINVAL;
829                                 minor = simple_strtoul(minorp+1, NULL, 0);
830                                 if (minor == 0)
831                                         return -EINVAL;
832                                 if (nfsd_minorversion(minor, sign == '-' ?
833                                                      NFSD_CLEAR : NFSD_SET) < 0)
834                                         return -EINVAL;
835                                 goto next;
836                         }
837                         switch(num) {
838                         case 2:
839                         case 3:
840                         case 4:
841                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
842                                 break;
843                         default:
844                                 return -EINVAL;
845                         }
846                 next:
847                         vers += len + 1;
848                 } while ((len = qword_get(&mesg, vers, size)) > 0);
849                 /* If all get turned off, turn them back on, as
850                  * having no versions is BAD
851                  */
852                 nfsd_reset_versions();
853         }
854
855         /* Now write current state into reply buffer */
856         len = 0;
857         sep = "";
858         remaining = SIMPLE_TRANSACTION_LIMIT;
859         for (num=2 ; num <= 4 ; num++)
860                 if (nfsd_vers(num, NFSD_AVAIL)) {
861                         len = snprintf(buf, remaining, "%s%c%d", sep,
862                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
863                                        num);
864                         sep = " ";
865
866                         if (len > remaining)
867                                 break;
868                         remaining -= len;
869                         buf += len;
870                         tlen += len;
871                 }
872         if (nfsd_vers(4, NFSD_AVAIL))
873                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
874                      minor++) {
875                         len = snprintf(buf, remaining, " %c4.%u",
876                                         (nfsd_vers(4, NFSD_TEST) &&
877                                          nfsd_minorversion(minor, NFSD_TEST)) ?
878                                                 '+' : '-',
879                                         minor);
880
881                         if (len > remaining)
882                                 break;
883                         remaining -= len;
884                         buf += len;
885                         tlen += len;
886                 }
887
888         len = snprintf(buf, remaining, "\n");
889         if (len > remaining)
890                 return -EINVAL;
891         return tlen + len;
892 }
893
894 /**
895  * write_versions - Set or report the available NFS protocol versions
896  *
897  * Input:
898  *                      buf:            ignored
899  *                      size:           zero
900  * Output:
901  *      On success:     passed-in buffer filled with '\n'-terminated C
902  *                      string containing positive or negative integer
903  *                      values representing the current status of each
904  *                      protocol version;
905  *                      return code is the size in bytes of the string
906  *      On error:       return code is zero or a negative errno value
907  *
908  * OR
909  *
910  * Input:
911  *                      buf:            C string containing whitespace-
912  *                                      separated positive or negative
913  *                                      integer values representing NFS
914  *                                      protocol versions to enable ("+n")
915  *                                      or disable ("-n")
916  *                      size:           non-zero length of C string in @buf
917  * Output:
918  *      On success:     status of zero or more protocol versions has
919  *                      been updated; passed-in buffer filled with
920  *                      '\n'-terminated C string containing positive
921  *                      or negative integer values representing the
922  *                      current status of each protocol version;
923  *                      return code is the size in bytes of the string
924  *      On error:       return code is zero or a negative errno value
925  */
926 static ssize_t write_versions(struct file *file, char *buf, size_t size)
927 {
928         ssize_t rv;
929
930         mutex_lock(&nfsd_mutex);
931         rv = __write_versions(file, buf, size);
932         mutex_unlock(&nfsd_mutex);
933         return rv;
934 }
935
936 /*
937  * Zero-length write.  Return a list of NFSD's current listener
938  * transports.
939  */
940 static ssize_t __write_ports_names(char *buf)
941 {
942         if (nfsd_serv == NULL)
943                 return 0;
944         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
945 }
946
947 /*
948  * A single 'fd' number was written, in which case it must be for
949  * a socket of a supported family/protocol, and we use it as an
950  * nfsd listener.
951  */
952 static ssize_t __write_ports_addfd(char *buf)
953 {
954         char *mesg = buf;
955         int fd, err;
956
957         err = get_int(&mesg, &fd);
958         if (err != 0 || fd < 0)
959                 return -EINVAL;
960
961         err = nfsd_create_serv();
962         if (err != 0)
963                 return err;
964
965         err = lockd_up();
966         if (err != 0)
967                 goto out;
968
969         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
970         if (err < 0)
971                 lockd_down();
972
973 out:
974         /* Decrease the count, but don't shut down the service */
975         nfsd_serv->sv_nrthreads--;
976         return err;
977 }
978
979 /*
980  * A '-' followed by the 'name' of a socket means we close the socket.
981  */
982 static ssize_t __write_ports_delfd(char *buf)
983 {
984         char *toclose;
985         int len = 0;
986
987         toclose = kstrdup(buf + 1, GFP_KERNEL);
988         if (toclose == NULL)
989                 return -ENOMEM;
990
991         if (nfsd_serv != NULL)
992                 len = svc_sock_names(nfsd_serv, buf,
993                                         SIMPLE_TRANSACTION_LIMIT, toclose);
994         if (len >= 0)
995                 lockd_down();
996
997         kfree(toclose);
998         return len;
999 }
1000
1001 /*
1002  * A transport listener is added by writing it's transport name and
1003  * a port number.
1004  */
1005 static ssize_t __write_ports_addxprt(char *buf)
1006 {
1007         char transport[16];
1008         int port, err;
1009
1010         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
1011                 return -EINVAL;
1012
1013         if (port < 1 || port > USHORT_MAX)
1014                 return -EINVAL;
1015
1016         err = nfsd_create_serv();
1017         if (err != 0)
1018                 return err;
1019
1020         err = svc_create_xprt(nfsd_serv, transport,
1021                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1022         if (err < 0) {
1023                 /* Give a reasonable perror msg for bad transport string */
1024                 if (err == -ENOENT)
1025                         err = -EPROTONOSUPPORT;
1026                 return err;
1027         }
1028         return 0;
1029 }
1030
1031 /*
1032  * A transport listener is removed by writing a "-", it's transport
1033  * name, and it's port number.
1034  */
1035 static ssize_t __write_ports_delxprt(char *buf)
1036 {
1037         struct svc_xprt *xprt;
1038         char transport[16];
1039         int port;
1040
1041         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1042                 return -EINVAL;
1043
1044         if (port < 1 || port > USHORT_MAX || nfsd_serv == NULL)
1045                 return -EINVAL;
1046
1047         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1048         if (xprt == NULL)
1049                 return -ENOTCONN;
1050
1051         svc_close_xprt(xprt);
1052         svc_xprt_put(xprt);
1053         return 0;
1054 }
1055
1056 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1057 {
1058         if (size == 0)
1059                 return __write_ports_names(buf);
1060
1061         if (isdigit(buf[0]))
1062                 return __write_ports_addfd(buf);
1063
1064         if (buf[0] == '-' && isdigit(buf[1]))
1065                 return __write_ports_delfd(buf);
1066
1067         if (isalpha(buf[0]))
1068                 return __write_ports_addxprt(buf);
1069
1070         if (buf[0] == '-' && isalpha(buf[1]))
1071                 return __write_ports_delxprt(buf);
1072
1073         return -EINVAL;
1074 }
1075
1076 /**
1077  * write_ports - Pass a socket file descriptor or transport name to listen on
1078  *
1079  * Input:
1080  *                      buf:            ignored
1081  *                      size:           zero
1082  * Output:
1083  *      On success:     passed-in buffer filled with a '\n'-terminated C
1084  *                      string containing a whitespace-separated list of
1085  *                      named NFSD listeners;
1086  *                      return code is the size in bytes of the string
1087  *      On error:       return code is zero or a negative errno value
1088  *
1089  * OR
1090  *
1091  * Input:
1092  *                      buf:            C string containing an unsigned
1093  *                                      integer value representing a bound
1094  *                                      but unconnected socket that is to be
1095  *                                      used as an NFSD listener; listen(3)
1096  *                                      must be called for a SOCK_STREAM
1097  *                                      socket, otherwise it is ignored
1098  *                      size:           non-zero length of C string in @buf
1099  * Output:
1100  *      On success:     NFS service is started;
1101  *                      passed-in buffer filled with a '\n'-terminated C
1102  *                      string containing a unique alphanumeric name of
1103  *                      the listener;
1104  *                      return code is the size in bytes of the string
1105  *      On error:       return code is a negative errno value
1106  *
1107  * OR
1108  *
1109  * Input:
1110  *                      buf:            C string containing a "-" followed
1111  *                                      by an integer value representing a
1112  *                                      previously passed in socket file
1113  *                                      descriptor
1114  *                      size:           non-zero length of C string in @buf
1115  * Output:
1116  *      On success:     NFS service no longer listens on that socket;
1117  *                      passed-in buffer filled with a '\n'-terminated C
1118  *                      string containing a unique name of the listener;
1119  *                      return code is the size in bytes of the string
1120  *      On error:       return code is a negative errno value
1121  *
1122  * OR
1123  *
1124  * Input:
1125  *                      buf:            C string containing a transport
1126  *                                      name and an unsigned integer value
1127  *                                      representing the port to listen on,
1128  *                                      separated by whitespace
1129  *                      size:           non-zero length of C string in @buf
1130  * Output:
1131  *      On success:     returns zero; NFS service is started
1132  *      On error:       return code is a negative errno value
1133  *
1134  * OR
1135  *
1136  * Input:
1137  *                      buf:            C string containing a "-" followed
1138  *                                      by a transport name and an unsigned
1139  *                                      integer value representing the port
1140  *                                      to listen on, separated by whitespace
1141  *                      size:           non-zero length of C string in @buf
1142  * Output:
1143  *      On success:     returns zero; NFS service no longer listens
1144  *                      on that transport
1145  *      On error:       return code is a negative errno value
1146  */
1147 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1148 {
1149         ssize_t rv;
1150
1151         mutex_lock(&nfsd_mutex);
1152         rv = __write_ports(file, buf, size);
1153         mutex_unlock(&nfsd_mutex);
1154         return rv;
1155 }
1156
1157
1158 int nfsd_max_blksize;
1159
1160 /**
1161  * write_maxblksize - Set or report the current NFS blksize
1162  *
1163  * Input:
1164  *                      buf:            ignored
1165  *                      size:           zero
1166  *
1167  * OR
1168  *
1169  * Input:
1170  *                      buf:            C string containing an unsigned
1171  *                                      integer value representing the new
1172  *                                      NFS blksize
1173  *                      size:           non-zero length of C string in @buf
1174  * Output:
1175  *      On success:     passed-in buffer filled with '\n'-terminated C string
1176  *                      containing numeric value of the current NFS blksize
1177  *                      setting;
1178  *                      return code is the size in bytes of the string
1179  *      On error:       return code is zero or a negative errno value
1180  */
1181 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1182 {
1183         char *mesg = buf;
1184         if (size > 0) {
1185                 int bsize;
1186                 int rv = get_int(&mesg, &bsize);
1187                 if (rv)
1188                         return rv;
1189                 /* force bsize into allowed range and
1190                  * required alignment.
1191                  */
1192                 if (bsize < 1024)
1193                         bsize = 1024;
1194                 if (bsize > NFSSVC_MAXBLKSIZE)
1195                         bsize = NFSSVC_MAXBLKSIZE;
1196                 bsize &= ~(1024-1);
1197                 mutex_lock(&nfsd_mutex);
1198                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
1199                         mutex_unlock(&nfsd_mutex);
1200                         return -EBUSY;
1201                 }
1202                 nfsd_max_blksize = bsize;
1203                 mutex_unlock(&nfsd_mutex);
1204         }
1205
1206         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1207                                                         nfsd_max_blksize);
1208 }
1209
1210 #ifdef CONFIG_NFSD_V4
1211 extern time_t nfs4_leasetime(void);
1212
1213 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
1214 {
1215         /* if size > 10 seconds, call
1216          * nfs4_reset_lease() then write out the new lease (seconds) as reply
1217          */
1218         char *mesg = buf;
1219         int rv, lease;
1220
1221         if (size > 0) {
1222                 if (nfsd_serv)
1223                         return -EBUSY;
1224                 rv = get_int(&mesg, &lease);
1225                 if (rv)
1226                         return rv;
1227                 if (lease < 10 || lease > 3600)
1228                         return -EINVAL;
1229                 nfs4_reset_lease(lease);
1230         }
1231
1232         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n",
1233                                                         nfs4_lease_time());
1234 }
1235
1236 /**
1237  * write_leasetime - Set or report the current NFSv4 lease time
1238  *
1239  * Input:
1240  *                      buf:            ignored
1241  *                      size:           zero
1242  *
1243  * OR
1244  *
1245  * Input:
1246  *                      buf:            C string containing an unsigned
1247  *                                      integer value representing the new
1248  *                                      NFSv4 lease expiry time
1249  *                      size:           non-zero length of C string in @buf
1250  * Output:
1251  *      On success:     passed-in buffer filled with '\n'-terminated C
1252  *                      string containing unsigned integer value of the
1253  *                      current lease expiry time;
1254  *                      return code is the size in bytes of the string
1255  *      On error:       return code is zero or a negative errno value
1256  */
1257 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1258 {
1259         ssize_t rv;
1260
1261         mutex_lock(&nfsd_mutex);
1262         rv = __write_leasetime(file, buf, size);
1263         mutex_unlock(&nfsd_mutex);
1264         return rv;
1265 }
1266
1267 extern char *nfs4_recoverydir(void);
1268
1269 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1270 {
1271         char *mesg = buf;
1272         char *recdir;
1273         int len, status;
1274
1275         if (size > 0) {
1276                 if (nfsd_serv)
1277                         return -EBUSY;
1278                 if (size > PATH_MAX || buf[size-1] != '\n')
1279                         return -EINVAL;
1280                 buf[size-1] = 0;
1281
1282                 recdir = mesg;
1283                 len = qword_get(&mesg, recdir, size);
1284                 if (len <= 0)
1285                         return -EINVAL;
1286
1287                 status = nfs4_reset_recoverydir(recdir);
1288         }
1289
1290         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1291                                                         nfs4_recoverydir());
1292 }
1293
1294 /**
1295  * write_recoverydir - Set or report the pathname of the recovery directory
1296  *
1297  * Input:
1298  *                      buf:            ignored
1299  *                      size:           zero
1300  *
1301  * OR
1302  *
1303  * Input:
1304  *                      buf:            C string containing the pathname
1305  *                                      of the directory on a local file
1306  *                                      system containing permanent NFSv4
1307  *                                      recovery data
1308  *                      size:           non-zero length of C string in @buf
1309  * Output:
1310  *      On success:     passed-in buffer filled with '\n'-terminated C string
1311  *                      containing the current recovery pathname setting;
1312  *                      return code is the size in bytes of the string
1313  *      On error:       return code is zero or a negative errno value
1314  */
1315 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1316 {
1317         ssize_t rv;
1318
1319         mutex_lock(&nfsd_mutex);
1320         rv = __write_recoverydir(file, buf, size);
1321         mutex_unlock(&nfsd_mutex);
1322         return rv;
1323 }
1324
1325 #endif
1326
1327 /*----------------------------------------------------------------------------*/
1328 /*
1329  *      populating the filesystem.
1330  */
1331
1332 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1333 {
1334         static struct tree_descr nfsd_files[] = {
1335                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1336                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1337                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1338                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1339                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1340                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1341                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1342                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1343                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1344                                         &transaction_ops, S_IWUSR|S_IRUSR},
1345                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1346                                         &transaction_ops, S_IWUSR|S_IRUSR},
1347                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1348                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1349                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1350                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1351                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1352                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1353                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1354 #ifdef CONFIG_NFSD_V4
1355                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1356                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1357 #endif
1358                 /* last one */ {""}
1359         };
1360         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1361 }
1362
1363 static int nfsd_get_sb(struct file_system_type *fs_type,
1364         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1365 {
1366         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1367 }
1368
1369 static struct file_system_type nfsd_fs_type = {
1370         .owner          = THIS_MODULE,
1371         .name           = "nfsd",
1372         .get_sb         = nfsd_get_sb,
1373         .kill_sb        = kill_litter_super,
1374 };
1375
1376 #ifdef CONFIG_PROC_FS
1377 static int create_proc_exports_entry(void)
1378 {
1379         struct proc_dir_entry *entry;
1380
1381         entry = proc_mkdir("fs/nfs", NULL);
1382         if (!entry)
1383                 return -ENOMEM;
1384         entry = proc_create("exports", 0, entry, &exports_operations);
1385         if (!entry)
1386                 return -ENOMEM;
1387         return 0;
1388 }
1389 #else /* CONFIG_PROC_FS */
1390 static int create_proc_exports_entry(void)
1391 {
1392         return 0;
1393 }
1394 #endif
1395
1396 static int __init init_nfsd(void)
1397 {
1398         int retval;
1399         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1400
1401         retval = nfs4_state_init(); /* nfs4 locking state */
1402         if (retval)
1403                 return retval;
1404         nfsd_stat_init();       /* Statistics */
1405         retval = nfsd_reply_cache_init();
1406         if (retval)
1407                 goto out_free_stat;
1408         retval = nfsd_export_init();
1409         if (retval)
1410                 goto out_free_cache;
1411         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1412         retval = nfsd_idmap_init();
1413         if (retval)
1414                 goto out_free_lockd;
1415         retval = create_proc_exports_entry();
1416         if (retval)
1417                 goto out_free_idmap;
1418         retval = register_filesystem(&nfsd_fs_type);
1419         if (retval)
1420                 goto out_free_all;
1421         return 0;
1422 out_free_all:
1423         remove_proc_entry("fs/nfs/exports", NULL);
1424         remove_proc_entry("fs/nfs", NULL);
1425 out_free_idmap:
1426         nfsd_idmap_shutdown();
1427 out_free_lockd:
1428         nfsd_lockd_shutdown();
1429         nfsd_export_shutdown();
1430 out_free_cache:
1431         nfsd_reply_cache_shutdown();
1432 out_free_stat:
1433         nfsd_stat_shutdown();
1434         nfsd4_free_slabs();
1435         return retval;
1436 }
1437
1438 static void __exit exit_nfsd(void)
1439 {
1440         nfsd_export_shutdown();
1441         nfsd_reply_cache_shutdown();
1442         remove_proc_entry("fs/nfs/exports", NULL);
1443         remove_proc_entry("fs/nfs", NULL);
1444         nfsd_stat_shutdown();
1445         nfsd_lockd_shutdown();
1446         nfsd_idmap_shutdown();
1447         nfsd4_free_slabs();
1448         unregister_filesystem(&nfsd_fs_type);
1449 }
1450
1451 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1452 MODULE_LICENSE("GPL");
1453 module_init(init_nfsd)
1454 module_exit(exit_nfsd)