nfsd: safer initialization order in find_file()
[linux-2.6.git] / fs / nfsd / nfsctl.c
1 /*
2  * Syscall interface to knfsd.
3  *
4  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
5  */
6
7 #include <linux/slab.h>
8 #include <linux/namei.h>
9 #include <linux/ctype.h>
10
11 #include <linux/nfsd_idmap.h>
12 #include <linux/sunrpc/svcsock.h>
13 #include <linux/nfsd/syscall.h>
14 #include <linux/lockd/lockd.h>
15 #include <linux/sunrpc/clnt.h>
16
17 #include "nfsd.h"
18 #include "cache.h"
19
20 /*
21  *      We have a single directory with 9 nodes in it.
22  */
23 enum {
24         NFSD_Root = 1,
25         NFSD_Svc,
26         NFSD_Add,
27         NFSD_Del,
28         NFSD_Export,
29         NFSD_Unexport,
30         NFSD_Getfd,
31         NFSD_Getfs,
32         NFSD_List,
33         NFSD_Export_features,
34         NFSD_Fh,
35         NFSD_FO_UnlockIP,
36         NFSD_FO_UnlockFS,
37         NFSD_Threads,
38         NFSD_Pool_Threads,
39         NFSD_Pool_Stats,
40         NFSD_Versions,
41         NFSD_Ports,
42         NFSD_MaxBlkSize,
43         /*
44          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
45          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
46          */
47 #ifdef CONFIG_NFSD_V4
48         NFSD_Leasetime,
49         NFSD_Gracetime,
50         NFSD_RecoveryDir,
51 #endif
52 };
53
54 /*
55  * write() for these nodes.
56  */
57 static ssize_t write_svc(struct file *file, char *buf, size_t size);
58 static ssize_t write_add(struct file *file, char *buf, size_t size);
59 static ssize_t write_del(struct file *file, char *buf, size_t size);
60 static ssize_t write_export(struct file *file, char *buf, size_t size);
61 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
62 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
63 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
64 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
65 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
66 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
67 static ssize_t write_threads(struct file *file, char *buf, size_t size);
68 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
69 static ssize_t write_versions(struct file *file, char *buf, size_t size);
70 static ssize_t write_ports(struct file *file, char *buf, size_t size);
71 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
72 #ifdef CONFIG_NFSD_V4
73 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
74 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
75 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
76 #endif
77
78 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
79         [NFSD_Svc] = write_svc,
80         [NFSD_Add] = write_add,
81         [NFSD_Del] = write_del,
82         [NFSD_Export] = write_export,
83         [NFSD_Unexport] = write_unexport,
84         [NFSD_Getfd] = write_getfd,
85         [NFSD_Getfs] = write_getfs,
86         [NFSD_Fh] = write_filehandle,
87         [NFSD_FO_UnlockIP] = write_unlock_ip,
88         [NFSD_FO_UnlockFS] = write_unlock_fs,
89         [NFSD_Threads] = write_threads,
90         [NFSD_Pool_Threads] = write_pool_threads,
91         [NFSD_Versions] = write_versions,
92         [NFSD_Ports] = write_ports,
93         [NFSD_MaxBlkSize] = write_maxblksize,
94 #ifdef CONFIG_NFSD_V4
95         [NFSD_Leasetime] = write_leasetime,
96         [NFSD_Gracetime] = write_gracetime,
97         [NFSD_RecoveryDir] = write_recoverydir,
98 #endif
99 };
100
101 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
102 {
103         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
104         char *data;
105         ssize_t rv;
106
107         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
108                 return -EINVAL;
109
110         data = simple_transaction_get(file, buf, size);
111         if (IS_ERR(data))
112                 return PTR_ERR(data);
113
114         rv =  write_op[ino](file, data, size);
115         if (rv >= 0) {
116                 simple_transaction_set(file, rv);
117                 rv = size;
118         }
119         return rv;
120 }
121
122 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
123 {
124         if (! file->private_data) {
125                 /* An attempt to read a transaction file without writing
126                  * causes a 0-byte write so that the file can return
127                  * state information
128                  */
129                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
130                 if (rv < 0)
131                         return rv;
132         }
133         return simple_transaction_read(file, buf, size, pos);
134 }
135
136 static const struct file_operations transaction_ops = {
137         .write          = nfsctl_transaction_write,
138         .read           = nfsctl_transaction_read,
139         .release        = simple_transaction_release,
140 };
141
142 static int exports_open(struct inode *inode, struct file *file)
143 {
144         return seq_open(file, &nfs_exports_op);
145 }
146
147 static const struct file_operations exports_operations = {
148         .open           = exports_open,
149         .read           = seq_read,
150         .llseek         = seq_lseek,
151         .release        = seq_release,
152         .owner          = THIS_MODULE,
153 };
154
155 static int export_features_show(struct seq_file *m, void *v)
156 {
157         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
158         return 0;
159 }
160
161 static int export_features_open(struct inode *inode, struct file *file)
162 {
163         return single_open(file, export_features_show, NULL);
164 }
165
166 static struct file_operations export_features_operations = {
167         .open           = export_features_open,
168         .read           = seq_read,
169         .llseek         = seq_lseek,
170         .release        = single_release,
171 };
172
173 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
174 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
175
176 static const struct file_operations pool_stats_operations = {
177         .open           = nfsd_pool_stats_open,
178         .read           = seq_read,
179         .llseek         = seq_lseek,
180         .release        = nfsd_pool_stats_release,
181         .owner          = THIS_MODULE,
182 };
183
184 /*----------------------------------------------------------------------------*/
185 /*
186  * payload - write methods
187  */
188
189 /**
190  * write_svc - Start kernel's NFSD server
191  *
192  * Deprecated.  /proc/fs/nfsd/threads is preferred.
193  * Function remains to support old versions of nfs-utils.
194  *
195  * Input:
196  *                      buf:    struct nfsctl_svc
197  *                              svc_port:       port number of this
198  *                                              server's listener
199  *                              svc_nthreads:   number of threads to start
200  *                      size:   size in bytes of passed in nfsctl_svc
201  * Output:
202  *      On success:     returns zero
203  *      On error:       return code is negative errno value
204  */
205 static ssize_t write_svc(struct file *file, char *buf, size_t size)
206 {
207         struct nfsctl_svc *data;
208         int err;
209         if (size < sizeof(*data))
210                 return -EINVAL;
211         data = (struct nfsctl_svc*) buf;
212         err = nfsd_svc(data->svc_port, data->svc_nthreads);
213         if (err < 0)
214                 return err;
215         return 0;
216 }
217
218 /**
219  * write_add - Add or modify client entry in auth unix cache
220  *
221  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
222  * Function remains to support old versions of nfs-utils.
223  *
224  * Input:
225  *                      buf:    struct nfsctl_client
226  *                              cl_ident:       '\0'-terminated C string
227  *                                              containing domain name
228  *                                              of client
229  *                              cl_naddr:       no. of items in cl_addrlist
230  *                              cl_addrlist:    array of client addresses
231  *                              cl_fhkeytype:   ignored
232  *                              cl_fhkeylen:    ignored
233  *                              cl_fhkey:       ignored
234  *                      size:   size in bytes of passed in nfsctl_client
235  * Output:
236  *      On success:     returns zero
237  *      On error:       return code is negative errno value
238  *
239  * Note: Only AF_INET client addresses are passed in, since
240  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
241  */
242 static ssize_t write_add(struct file *file, char *buf, size_t size)
243 {
244         struct nfsctl_client *data;
245         if (size < sizeof(*data))
246                 return -EINVAL;
247         data = (struct nfsctl_client *)buf;
248         return exp_addclient(data);
249 }
250
251 /**
252  * write_del - Remove client from auth unix cache
253  *
254  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
255  * Function remains to support old versions of nfs-utils.
256  *
257  * Input:
258  *                      buf:    struct nfsctl_client
259  *                              cl_ident:       '\0'-terminated C string
260  *                                              containing domain name
261  *                                              of client
262  *                              cl_naddr:       ignored
263  *                              cl_addrlist:    ignored
264  *                              cl_fhkeytype:   ignored
265  *                              cl_fhkeylen:    ignored
266  *                              cl_fhkey:       ignored
267  *                      size:   size in bytes of passed in nfsctl_client
268  * Output:
269  *      On success:     returns zero
270  *      On error:       return code is negative errno value
271  *
272  * Note: Only AF_INET client addresses are passed in, since
273  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
274  */
275 static ssize_t write_del(struct file *file, char *buf, size_t size)
276 {
277         struct nfsctl_client *data;
278         if (size < sizeof(*data))
279                 return -EINVAL;
280         data = (struct nfsctl_client *)buf;
281         return exp_delclient(data);
282 }
283
284 /**
285  * write_export - Export part or all of a local file system
286  *
287  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
288  * Function remains to support old versions of nfs-utils.
289  *
290  * Input:
291  *                      buf:    struct nfsctl_export
292  *                              ex_client:      '\0'-terminated C string
293  *                                              containing domain name
294  *                                              of client allowed to access
295  *                                              this export
296  *                              ex_path:        '\0'-terminated C string
297  *                                              containing pathname of
298  *                                              directory in local file system
299  *                              ex_dev:         fsid to use for this export
300  *                              ex_ino:         ignored
301  *                              ex_flags:       export flags for this export
302  *                              ex_anon_uid:    UID to use for anonymous
303  *                                              requests
304  *                              ex_anon_gid:    GID to use for anonymous
305  *                                              requests
306  *                      size:   size in bytes of passed in nfsctl_export
307  * Output:
308  *      On success:     returns zero
309  *      On error:       return code is negative errno value
310  */
311 static ssize_t write_export(struct file *file, char *buf, size_t size)
312 {
313         struct nfsctl_export *data;
314         if (size < sizeof(*data))
315                 return -EINVAL;
316         data = (struct nfsctl_export*)buf;
317         return exp_export(data);
318 }
319
320 /**
321  * write_unexport - Unexport a previously exported file system
322  *
323  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
324  * Function remains to support old versions of nfs-utils.
325  *
326  * Input:
327  *                      buf:    struct nfsctl_export
328  *                              ex_client:      '\0'-terminated C string
329  *                                              containing domain name
330  *                                              of client no longer allowed
331  *                                              to access this export
332  *                              ex_path:        '\0'-terminated C string
333  *                                              containing pathname of
334  *                                              directory in local file system
335  *                              ex_dev:         ignored
336  *                              ex_ino:         ignored
337  *                              ex_flags:       ignored
338  *                              ex_anon_uid:    ignored
339  *                              ex_anon_gid:    ignored
340  *                      size:   size in bytes of passed in nfsctl_export
341  * Output:
342  *      On success:     returns zero
343  *      On error:       return code is negative errno value
344  */
345 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
346 {
347         struct nfsctl_export *data;
348
349         if (size < sizeof(*data))
350                 return -EINVAL;
351         data = (struct nfsctl_export*)buf;
352         return exp_unexport(data);
353 }
354
355 /**
356  * write_getfs - Get a variable-length NFS file handle by path
357  *
358  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
359  * Function remains to support old versions of nfs-utils.
360  *
361  * Input:
362  *                      buf:    struct nfsctl_fsparm
363  *                              gd_addr:        socket address of client
364  *                              gd_path:        '\0'-terminated C string
365  *                                              containing pathname of
366  *                                              directory in local file system
367  *                              gd_maxlen:      maximum size of returned file
368  *                                              handle
369  *                      size:   size in bytes of passed in nfsctl_fsparm
370  * Output:
371  *      On success:     passed-in buffer filled with a knfsd_fh structure
372  *                      (a variable-length raw NFS file handle);
373  *                      return code is the size in bytes of the file handle
374  *      On error:       return code is negative errno value
375  *
376  * Note: Only AF_INET client addresses are passed in, since gd_addr
377  * is the same size as a struct sockaddr_in.
378  */
379 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
380 {
381         struct nfsctl_fsparm *data;
382         struct sockaddr_in *sin;
383         struct auth_domain *clp;
384         int err = 0;
385         struct knfsd_fh *res;
386         struct in6_addr in6;
387
388         if (size < sizeof(*data))
389                 return -EINVAL;
390         data = (struct nfsctl_fsparm*)buf;
391         err = -EPROTONOSUPPORT;
392         if (data->gd_addr.sa_family != AF_INET)
393                 goto out;
394         sin = (struct sockaddr_in *)&data->gd_addr;
395         if (data->gd_maxlen > NFS3_FHSIZE)
396                 data->gd_maxlen = NFS3_FHSIZE;
397
398         res = (struct knfsd_fh*)buf;
399
400         exp_readlock();
401
402         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
403
404         clp = auth_unix_lookup(&in6);
405         if (!clp)
406                 err = -EPERM;
407         else {
408                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
409                 auth_domain_put(clp);
410         }
411         exp_readunlock();
412         if (err == 0)
413                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
414  out:
415         return err;
416 }
417
418 /**
419  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
420  *
421  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
422  * Function remains to support old versions of nfs-utils.
423  *
424  * Input:
425  *                      buf:    struct nfsctl_fdparm
426  *                              gd_addr:        socket address of client
427  *                              gd_path:        '\0'-terminated C string
428  *                                              containing pathname of
429  *                                              directory in local file system
430  *                              gd_version:     fdparm structure version
431  *                      size:   size in bytes of passed in nfsctl_fdparm
432  * Output:
433  *      On success:     passed-in buffer filled with nfsctl_res
434  *                      (a fixed-length raw NFS file handle);
435  *                      return code is the size in bytes of the file handle
436  *      On error:       return code is negative errno value
437  *
438  * Note: Only AF_INET client addresses are passed in, since gd_addr
439  * is the same size as a struct sockaddr_in.
440  */
441 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
442 {
443         struct nfsctl_fdparm *data;
444         struct sockaddr_in *sin;
445         struct auth_domain *clp;
446         int err = 0;
447         struct knfsd_fh fh;
448         char *res;
449         struct in6_addr in6;
450
451         if (size < sizeof(*data))
452                 return -EINVAL;
453         data = (struct nfsctl_fdparm*)buf;
454         err = -EPROTONOSUPPORT;
455         if (data->gd_addr.sa_family != AF_INET)
456                 goto out;
457         err = -EINVAL;
458         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
459                 goto out;
460
461         res = buf;
462         sin = (struct sockaddr_in *)&data->gd_addr;
463         exp_readlock();
464
465         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
466
467         clp = auth_unix_lookup(&in6);
468         if (!clp)
469                 err = -EPERM;
470         else {
471                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
472                 auth_domain_put(clp);
473         }
474         exp_readunlock();
475
476         if (err == 0) {
477                 memset(res,0, NFS_FHSIZE);
478                 memcpy(res, &fh.fh_base, fh.fh_size);
479                 err = NFS_FHSIZE;
480         }
481  out:
482         return err;
483 }
484
485 /**
486  * write_unlock_ip - Release all locks used by a client
487  *
488  * Experimental.
489  *
490  * Input:
491  *                      buf:    '\n'-terminated C string containing a
492  *                              presentation format IP address
493  *                      size:   length of C string in @buf
494  * Output:
495  *      On success:     returns zero if all specified locks were released;
496  *                      returns one if one or more locks were not released
497  *      On error:       return code is negative errno value
498  */
499 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
500 {
501         struct sockaddr_storage address;
502         struct sockaddr *sap = (struct sockaddr *)&address;
503         size_t salen = sizeof(address);
504         char *fo_path;
505
506         /* sanity check */
507         if (size == 0)
508                 return -EINVAL;
509
510         if (buf[size-1] != '\n')
511                 return -EINVAL;
512
513         fo_path = buf;
514         if (qword_get(&buf, fo_path, size) < 0)
515                 return -EINVAL;
516
517         if (rpc_pton(fo_path, size, sap, salen) == 0)
518                 return -EINVAL;
519
520         return nlmsvc_unlock_all_by_ip(sap);
521 }
522
523 /**
524  * write_unlock_fs - Release all locks on a local file system
525  *
526  * Experimental.
527  *
528  * Input:
529  *                      buf:    '\n'-terminated C string containing the
530  *                              absolute pathname of a local file system
531  *                      size:   length of C string in @buf
532  * Output:
533  *      On success:     returns zero if all specified locks were released;
534  *                      returns one if one or more locks were not released
535  *      On error:       return code is negative errno value
536  */
537 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
538 {
539         struct path path;
540         char *fo_path;
541         int error;
542
543         /* sanity check */
544         if (size == 0)
545                 return -EINVAL;
546
547         if (buf[size-1] != '\n')
548                 return -EINVAL;
549
550         fo_path = buf;
551         if (qword_get(&buf, fo_path, size) < 0)
552                 return -EINVAL;
553
554         error = kern_path(fo_path, 0, &path);
555         if (error)
556                 return error;
557
558         /*
559          * XXX: Needs better sanity checking.  Otherwise we could end up
560          * releasing locks on the wrong file system.
561          *
562          * For example:
563          * 1.  Does the path refer to a directory?
564          * 2.  Is that directory a mount point, or
565          * 3.  Is that directory the root of an exported file system?
566          */
567         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
568
569         path_put(&path);
570         return error;
571 }
572
573 /**
574  * write_filehandle - Get a variable-length NFS file handle by path
575  *
576  * On input, the buffer contains a '\n'-terminated C string comprised of
577  * three alphanumeric words separated by whitespace.  The string may
578  * contain escape sequences.
579  *
580  * Input:
581  *                      buf:
582  *                              domain:         client domain name
583  *                              path:           export pathname
584  *                              maxsize:        numeric maximum size of
585  *                                              @buf
586  *                      size:   length of C string in @buf
587  * Output:
588  *      On success:     passed-in buffer filled with '\n'-terminated C
589  *                      string containing a ASCII hex text version
590  *                      of the NFS file handle;
591  *                      return code is the size in bytes of the string
592  *      On error:       return code is negative errno value
593  */
594 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
595 {
596         char *dname, *path;
597         int uninitialized_var(maxsize);
598         char *mesg = buf;
599         int len;
600         struct auth_domain *dom;
601         struct knfsd_fh fh;
602
603         if (size == 0)
604                 return -EINVAL;
605
606         if (buf[size-1] != '\n')
607                 return -EINVAL;
608         buf[size-1] = 0;
609
610         dname = mesg;
611         len = qword_get(&mesg, dname, size);
612         if (len <= 0)
613                 return -EINVAL;
614         
615         path = dname+len+1;
616         len = qword_get(&mesg, path, size);
617         if (len <= 0)
618                 return -EINVAL;
619
620         len = get_int(&mesg, &maxsize);
621         if (len)
622                 return len;
623
624         if (maxsize < NFS_FHSIZE)
625                 return -EINVAL;
626         if (maxsize > NFS3_FHSIZE)
627                 maxsize = NFS3_FHSIZE;
628
629         if (qword_get(&mesg, mesg, size)>0)
630                 return -EINVAL;
631
632         /* we have all the words, they are in buf.. */
633         dom = unix_domain_find(dname);
634         if (!dom)
635                 return -ENOMEM;
636
637         len = exp_rootfh(dom, path, &fh,  maxsize);
638         auth_domain_put(dom);
639         if (len)
640                 return len;
641         
642         mesg = buf;
643         len = SIMPLE_TRANSACTION_LIMIT;
644         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
645         mesg[-1] = '\n';
646         return mesg - buf;      
647 }
648
649 /**
650  * write_threads - Start NFSD, or report the current number of running threads
651  *
652  * Input:
653  *                      buf:            ignored
654  *                      size:           zero
655  * Output:
656  *      On success:     passed-in buffer filled with '\n'-terminated C
657  *                      string numeric value representing the number of
658  *                      running NFSD threads;
659  *                      return code is the size in bytes of the string
660  *      On error:       return code is zero
661  *
662  * OR
663  *
664  * Input:
665  *                      buf:            C string containing an unsigned
666  *                                      integer value representing the
667  *                                      number of NFSD threads to start
668  *                      size:           non-zero length of C string in @buf
669  * Output:
670  *      On success:     NFS service is started;
671  *                      passed-in buffer filled with '\n'-terminated C
672  *                      string numeric value representing the number of
673  *                      running NFSD threads;
674  *                      return code is the size in bytes of the string
675  *      On error:       return code is zero or a negative errno value
676  */
677 static ssize_t write_threads(struct file *file, char *buf, size_t size)
678 {
679         char *mesg = buf;
680         int rv;
681         if (size > 0) {
682                 int newthreads;
683                 rv = get_int(&mesg, &newthreads);
684                 if (rv)
685                         return rv;
686                 if (newthreads < 0)
687                         return -EINVAL;
688                 rv = nfsd_svc(NFS_PORT, newthreads);
689                 if (rv < 0)
690                         return rv;
691         } else
692                 rv = nfsd_nrthreads();
693
694         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
695 }
696
697 /**
698  * write_pool_threads - Set or report the current number of threads per pool
699  *
700  * Input:
701  *                      buf:            ignored
702  *                      size:           zero
703  *
704  * OR
705  *
706  * Input:
707  *                      buf:            C string containing whitespace-
708  *                                      separated unsigned integer values
709  *                                      representing the number of NFSD
710  *                                      threads to start in each pool
711  *                      size:           non-zero length of C string in @buf
712  * Output:
713  *      On success:     passed-in buffer filled with '\n'-terminated C
714  *                      string containing integer values representing the
715  *                      number of NFSD threads in each pool;
716  *                      return code is the size in bytes of the string
717  *      On error:       return code is zero or a negative errno value
718  */
719 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
720 {
721         /* if size > 0, look for an array of number of threads per node
722          * and apply them  then write out number of threads per node as reply
723          */
724         char *mesg = buf;
725         int i;
726         int rv;
727         int len;
728         int npools;
729         int *nthreads;
730
731         mutex_lock(&nfsd_mutex);
732         npools = nfsd_nrpools();
733         if (npools == 0) {
734                 /*
735                  * NFS is shut down.  The admin can start it by
736                  * writing to the threads file but NOT the pool_threads
737                  * file, sorry.  Report zero threads.
738                  */
739                 mutex_unlock(&nfsd_mutex);
740                 strcpy(buf, "0\n");
741                 return strlen(buf);
742         }
743
744         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
745         rv = -ENOMEM;
746         if (nthreads == NULL)
747                 goto out_free;
748
749         if (size > 0) {
750                 for (i = 0; i < npools; i++) {
751                         rv = get_int(&mesg, &nthreads[i]);
752                         if (rv == -ENOENT)
753                                 break;          /* fewer numbers than pools */
754                         if (rv)
755                                 goto out_free;  /* syntax error */
756                         rv = -EINVAL;
757                         if (nthreads[i] < 0)
758                                 goto out_free;
759                 }
760                 rv = nfsd_set_nrthreads(i, nthreads);
761                 if (rv)
762                         goto out_free;
763         }
764
765         rv = nfsd_get_nrthreads(npools, nthreads);
766         if (rv)
767                 goto out_free;
768
769         mesg = buf;
770         size = SIMPLE_TRANSACTION_LIMIT;
771         for (i = 0; i < npools && size > 0; i++) {
772                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
773                 len = strlen(mesg);
774                 size -= len;
775                 mesg += len;
776         }
777         rv = mesg - buf;
778 out_free:
779         kfree(nthreads);
780         mutex_unlock(&nfsd_mutex);
781         return rv;
782 }
783
784 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
785 {
786         char *mesg = buf;
787         char *vers, *minorp, sign;
788         int len, num, remaining;
789         unsigned minor;
790         ssize_t tlen = 0;
791         char *sep;
792
793         if (size>0) {
794                 if (nfsd_serv)
795                         /* Cannot change versions without updating
796                          * nfsd_serv->sv_xdrsize, and reallocing
797                          * rq_argp and rq_resp
798                          */
799                         return -EBUSY;
800                 if (buf[size-1] != '\n')
801                         return -EINVAL;
802                 buf[size-1] = 0;
803
804                 vers = mesg;
805                 len = qword_get(&mesg, vers, size);
806                 if (len <= 0) return -EINVAL;
807                 do {
808                         sign = *vers;
809                         if (sign == '+' || sign == '-')
810                                 num = simple_strtol((vers+1), &minorp, 0);
811                         else
812                                 num = simple_strtol(vers, &minorp, 0);
813                         if (*minorp == '.') {
814                                 if (num < 4)
815                                         return -EINVAL;
816                                 minor = simple_strtoul(minorp+1, NULL, 0);
817                                 if (minor == 0)
818                                         return -EINVAL;
819                                 if (nfsd_minorversion(minor, sign == '-' ?
820                                                      NFSD_CLEAR : NFSD_SET) < 0)
821                                         return -EINVAL;
822                                 goto next;
823                         }
824                         switch(num) {
825                         case 2:
826                         case 3:
827                         case 4:
828                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
829                                 break;
830                         default:
831                                 return -EINVAL;
832                         }
833                 next:
834                         vers += len + 1;
835                 } while ((len = qword_get(&mesg, vers, size)) > 0);
836                 /* If all get turned off, turn them back on, as
837                  * having no versions is BAD
838                  */
839                 nfsd_reset_versions();
840         }
841
842         /* Now write current state into reply buffer */
843         len = 0;
844         sep = "";
845         remaining = SIMPLE_TRANSACTION_LIMIT;
846         for (num=2 ; num <= 4 ; num++)
847                 if (nfsd_vers(num, NFSD_AVAIL)) {
848                         len = snprintf(buf, remaining, "%s%c%d", sep,
849                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
850                                        num);
851                         sep = " ";
852
853                         if (len > remaining)
854                                 break;
855                         remaining -= len;
856                         buf += len;
857                         tlen += len;
858                 }
859         if (nfsd_vers(4, NFSD_AVAIL))
860                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
861                      minor++) {
862                         len = snprintf(buf, remaining, " %c4.%u",
863                                         (nfsd_vers(4, NFSD_TEST) &&
864                                          nfsd_minorversion(minor, NFSD_TEST)) ?
865                                                 '+' : '-',
866                                         minor);
867
868                         if (len > remaining)
869                                 break;
870                         remaining -= len;
871                         buf += len;
872                         tlen += len;
873                 }
874
875         len = snprintf(buf, remaining, "\n");
876         if (len > remaining)
877                 return -EINVAL;
878         return tlen + len;
879 }
880
881 /**
882  * write_versions - Set or report the available NFS protocol versions
883  *
884  * Input:
885  *                      buf:            ignored
886  *                      size:           zero
887  * Output:
888  *      On success:     passed-in buffer filled with '\n'-terminated C
889  *                      string containing positive or negative integer
890  *                      values representing the current status of each
891  *                      protocol version;
892  *                      return code is the size in bytes of the string
893  *      On error:       return code is zero or a negative errno value
894  *
895  * OR
896  *
897  * Input:
898  *                      buf:            C string containing whitespace-
899  *                                      separated positive or negative
900  *                                      integer values representing NFS
901  *                                      protocol versions to enable ("+n")
902  *                                      or disable ("-n")
903  *                      size:           non-zero length of C string in @buf
904  * Output:
905  *      On success:     status of zero or more protocol versions has
906  *                      been updated; passed-in buffer filled with
907  *                      '\n'-terminated C string containing positive
908  *                      or negative integer values representing the
909  *                      current status of each protocol version;
910  *                      return code is the size in bytes of the string
911  *      On error:       return code is zero or a negative errno value
912  */
913 static ssize_t write_versions(struct file *file, char *buf, size_t size)
914 {
915         ssize_t rv;
916
917         mutex_lock(&nfsd_mutex);
918         rv = __write_versions(file, buf, size);
919         mutex_unlock(&nfsd_mutex);
920         return rv;
921 }
922
923 /*
924  * Zero-length write.  Return a list of NFSD's current listener
925  * transports.
926  */
927 static ssize_t __write_ports_names(char *buf)
928 {
929         if (nfsd_serv == NULL)
930                 return 0;
931         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
932 }
933
934 /*
935  * A single 'fd' number was written, in which case it must be for
936  * a socket of a supported family/protocol, and we use it as an
937  * nfsd listener.
938  */
939 static ssize_t __write_ports_addfd(char *buf)
940 {
941         char *mesg = buf;
942         int fd, err;
943
944         err = get_int(&mesg, &fd);
945         if (err != 0 || fd < 0)
946                 return -EINVAL;
947
948         err = nfsd_create_serv();
949         if (err != 0)
950                 return err;
951
952         err = lockd_up();
953         if (err != 0)
954                 goto out;
955
956         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
957         if (err < 0)
958                 lockd_down();
959
960 out:
961         /* Decrease the count, but don't shut down the service */
962         nfsd_serv->sv_nrthreads--;
963         return err;
964 }
965
966 /*
967  * A '-' followed by the 'name' of a socket means we close the socket.
968  */
969 static ssize_t __write_ports_delfd(char *buf)
970 {
971         char *toclose;
972         int len = 0;
973
974         toclose = kstrdup(buf + 1, GFP_KERNEL);
975         if (toclose == NULL)
976                 return -ENOMEM;
977
978         if (nfsd_serv != NULL)
979                 len = svc_sock_names(nfsd_serv, buf,
980                                         SIMPLE_TRANSACTION_LIMIT, toclose);
981         if (len >= 0)
982                 lockd_down();
983
984         kfree(toclose);
985         return len;
986 }
987
988 /*
989  * A transport listener is added by writing it's transport name and
990  * a port number.
991  */
992 static ssize_t __write_ports_addxprt(char *buf)
993 {
994         char transport[16];
995         struct svc_xprt *xprt;
996         int port, err;
997
998         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
999                 return -EINVAL;
1000
1001         if (port < 1 || port > USHORT_MAX)
1002                 return -EINVAL;
1003
1004         err = nfsd_create_serv();
1005         if (err != 0)
1006                 return err;
1007
1008         err = svc_create_xprt(nfsd_serv, transport,
1009                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1010         if (err < 0)
1011                 goto out_err;
1012
1013         err = svc_create_xprt(nfsd_serv, transport,
1014                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1015         if (err < 0 && err != -EAFNOSUPPORT)
1016                 goto out_close;
1017         return 0;
1018 out_close:
1019         xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1020         if (xprt != NULL) {
1021                 svc_close_xprt(xprt);
1022                 svc_xprt_put(xprt);
1023         }
1024 out_err:
1025         /* Decrease the count, but don't shut down the service */
1026         nfsd_serv->sv_nrthreads--;
1027         return err;
1028 }
1029
1030 /*
1031  * A transport listener is removed by writing a "-", it's transport
1032  * name, and it's port number.
1033  */
1034 static ssize_t __write_ports_delxprt(char *buf)
1035 {
1036         struct svc_xprt *xprt;
1037         char transport[16];
1038         int port;
1039
1040         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1041                 return -EINVAL;
1042
1043         if (port < 1 || port > USHORT_MAX || nfsd_serv == NULL)
1044                 return -EINVAL;
1045
1046         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1047         if (xprt == NULL)
1048                 return -ENOTCONN;
1049
1050         svc_close_xprt(xprt);
1051         svc_xprt_put(xprt);
1052         return 0;
1053 }
1054
1055 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1056 {
1057         if (size == 0)
1058                 return __write_ports_names(buf);
1059
1060         if (isdigit(buf[0]))
1061                 return __write_ports_addfd(buf);
1062
1063         if (buf[0] == '-' && isdigit(buf[1]))
1064                 return __write_ports_delfd(buf);
1065
1066         if (isalpha(buf[0]))
1067                 return __write_ports_addxprt(buf);
1068
1069         if (buf[0] == '-' && isalpha(buf[1]))
1070                 return __write_ports_delxprt(buf);
1071
1072         return -EINVAL;
1073 }
1074
1075 /**
1076  * write_ports - Pass a socket file descriptor or transport name to listen on
1077  *
1078  * Input:
1079  *                      buf:            ignored
1080  *                      size:           zero
1081  * Output:
1082  *      On success:     passed-in buffer filled with a '\n'-terminated C
1083  *                      string containing a whitespace-separated list of
1084  *                      named NFSD listeners;
1085  *                      return code is the size in bytes of the string
1086  *      On error:       return code is zero or a negative errno value
1087  *
1088  * OR
1089  *
1090  * Input:
1091  *                      buf:            C string containing an unsigned
1092  *                                      integer value representing a bound
1093  *                                      but unconnected socket that is to be
1094  *                                      used as an NFSD listener; listen(3)
1095  *                                      must be called for a SOCK_STREAM
1096  *                                      socket, otherwise it is ignored
1097  *                      size:           non-zero length of C string in @buf
1098  * Output:
1099  *      On success:     NFS service is started;
1100  *                      passed-in buffer filled with a '\n'-terminated C
1101  *                      string containing a unique alphanumeric name of
1102  *                      the listener;
1103  *                      return code is the size in bytes of the string
1104  *      On error:       return code is a negative errno value
1105  *
1106  * OR
1107  *
1108  * Input:
1109  *                      buf:            C string containing a "-" followed
1110  *                                      by an integer value representing a
1111  *                                      previously passed in socket file
1112  *                                      descriptor
1113  *                      size:           non-zero length of C string in @buf
1114  * Output:
1115  *      On success:     NFS service no longer listens on that socket;
1116  *                      passed-in buffer filled with a '\n'-terminated C
1117  *                      string containing a unique name of the listener;
1118  *                      return code is the size in bytes of the string
1119  *      On error:       return code is a negative errno value
1120  *
1121  * OR
1122  *
1123  * Input:
1124  *                      buf:            C string containing a transport
1125  *                                      name and an unsigned integer value
1126  *                                      representing the port to listen on,
1127  *                                      separated by whitespace
1128  *                      size:           non-zero length of C string in @buf
1129  * Output:
1130  *      On success:     returns zero; NFS service is started
1131  *      On error:       return code is a negative errno value
1132  *
1133  * OR
1134  *
1135  * Input:
1136  *                      buf:            C string containing a "-" followed
1137  *                                      by a transport name and an unsigned
1138  *                                      integer value representing the port
1139  *                                      to listen on, separated by whitespace
1140  *                      size:           non-zero length of C string in @buf
1141  * Output:
1142  *      On success:     returns zero; NFS service no longer listens
1143  *                      on that transport
1144  *      On error:       return code is a negative errno value
1145  */
1146 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1147 {
1148         ssize_t rv;
1149
1150         mutex_lock(&nfsd_mutex);
1151         rv = __write_ports(file, buf, size);
1152         mutex_unlock(&nfsd_mutex);
1153         return rv;
1154 }
1155
1156
1157 int nfsd_max_blksize;
1158
1159 /**
1160  * write_maxblksize - Set or report the current NFS blksize
1161  *
1162  * Input:
1163  *                      buf:            ignored
1164  *                      size:           zero
1165  *
1166  * OR
1167  *
1168  * Input:
1169  *                      buf:            C string containing an unsigned
1170  *                                      integer value representing the new
1171  *                                      NFS blksize
1172  *                      size:           non-zero length of C string in @buf
1173  * Output:
1174  *      On success:     passed-in buffer filled with '\n'-terminated C string
1175  *                      containing numeric value of the current NFS blksize
1176  *                      setting;
1177  *                      return code is the size in bytes of the string
1178  *      On error:       return code is zero or a negative errno value
1179  */
1180 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1181 {
1182         char *mesg = buf;
1183         if (size > 0) {
1184                 int bsize;
1185                 int rv = get_int(&mesg, &bsize);
1186                 if (rv)
1187                         return rv;
1188                 /* force bsize into allowed range and
1189                  * required alignment.
1190                  */
1191                 if (bsize < 1024)
1192                         bsize = 1024;
1193                 if (bsize > NFSSVC_MAXBLKSIZE)
1194                         bsize = NFSSVC_MAXBLKSIZE;
1195                 bsize &= ~(1024-1);
1196                 mutex_lock(&nfsd_mutex);
1197                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
1198                         mutex_unlock(&nfsd_mutex);
1199                         return -EBUSY;
1200                 }
1201                 nfsd_max_blksize = bsize;
1202                 mutex_unlock(&nfsd_mutex);
1203         }
1204
1205         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1206                                                         nfsd_max_blksize);
1207 }
1208
1209 #ifdef CONFIG_NFSD_V4
1210 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1211 {
1212         char *mesg = buf;
1213         int rv, i;
1214
1215         if (size > 0) {
1216                 if (nfsd_serv)
1217                         return -EBUSY;
1218                 rv = get_int(&mesg, &i);
1219                 if (rv)
1220                         return rv;
1221                 /*
1222                  * Some sanity checking.  We don't have a reason for
1223                  * these particular numbers, but problems with the
1224                  * extremes are:
1225                  *      - Too short: the briefest network outage may
1226                  *        cause clients to lose all their locks.  Also,
1227                  *        the frequent polling may be wasteful.
1228                  *      - Too long: do you really want reboot recovery
1229                  *        to take more than an hour?  Or to make other
1230                  *        clients wait an hour before being able to
1231                  *        revoke a dead client's locks?
1232                  */
1233                 if (i < 10 || i > 3600)
1234                         return -EINVAL;
1235                 *time = i;
1236         }
1237
1238         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
1239 }
1240
1241 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1242 {
1243         ssize_t rv;
1244
1245         mutex_lock(&nfsd_mutex);
1246         rv = __nfsd4_write_time(file, buf, size, time);
1247         mutex_unlock(&nfsd_mutex);
1248         return rv;
1249 }
1250
1251 /**
1252  * write_leasetime - Set or report the current NFSv4 lease time
1253  *
1254  * Input:
1255  *                      buf:            ignored
1256  *                      size:           zero
1257  *
1258  * OR
1259  *
1260  * Input:
1261  *                      buf:            C string containing an unsigned
1262  *                                      integer value representing the new
1263  *                                      NFSv4 lease expiry time
1264  *                      size:           non-zero length of C string in @buf
1265  * Output:
1266  *      On success:     passed-in buffer filled with '\n'-terminated C
1267  *                      string containing unsigned integer value of the
1268  *                      current lease expiry time;
1269  *                      return code is the size in bytes of the string
1270  *      On error:       return code is zero or a negative errno value
1271  */
1272 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1273 {
1274         return nfsd4_write_time(file, buf, size, &nfsd4_lease);
1275 }
1276
1277 /**
1278  * write_gracetime - Set or report current NFSv4 grace period time
1279  *
1280  * As above, but sets the time of the NFSv4 grace period.
1281  *
1282  * Note this should never be set to less than the *previous*
1283  * lease-period time, but we don't try to enforce this.  (In the common
1284  * case (a new boot), we don't know what the previous lease time was
1285  * anyway.)
1286  */
1287 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1288 {
1289         return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1290 }
1291
1292 extern char *nfs4_recoverydir(void);
1293
1294 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1295 {
1296         char *mesg = buf;
1297         char *recdir;
1298         int len, status;
1299
1300         if (size > 0) {
1301                 if (nfsd_serv)
1302                         return -EBUSY;
1303                 if (size > PATH_MAX || buf[size-1] != '\n')
1304                         return -EINVAL;
1305                 buf[size-1] = 0;
1306
1307                 recdir = mesg;
1308                 len = qword_get(&mesg, recdir, size);
1309                 if (len <= 0)
1310                         return -EINVAL;
1311
1312                 status = nfs4_reset_recoverydir(recdir);
1313         }
1314
1315         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1316                                                         nfs4_recoverydir());
1317 }
1318
1319 /**
1320  * write_recoverydir - Set or report the pathname of the recovery directory
1321  *
1322  * Input:
1323  *                      buf:            ignored
1324  *                      size:           zero
1325  *
1326  * OR
1327  *
1328  * Input:
1329  *                      buf:            C string containing the pathname
1330  *                                      of the directory on a local file
1331  *                                      system containing permanent NFSv4
1332  *                                      recovery data
1333  *                      size:           non-zero length of C string in @buf
1334  * Output:
1335  *      On success:     passed-in buffer filled with '\n'-terminated C string
1336  *                      containing the current recovery pathname setting;
1337  *                      return code is the size in bytes of the string
1338  *      On error:       return code is zero or a negative errno value
1339  */
1340 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1341 {
1342         ssize_t rv;
1343
1344         mutex_lock(&nfsd_mutex);
1345         rv = __write_recoverydir(file, buf, size);
1346         mutex_unlock(&nfsd_mutex);
1347         return rv;
1348 }
1349
1350 #endif
1351
1352 /*----------------------------------------------------------------------------*/
1353 /*
1354  *      populating the filesystem.
1355  */
1356
1357 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1358 {
1359         static struct tree_descr nfsd_files[] = {
1360                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1361                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1362                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1363                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1364                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1365                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1366                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1367                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1368                 [NFSD_Export_features] = {"export_features",
1369                                         &export_features_operations, S_IRUGO},
1370                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1371                                         &transaction_ops, S_IWUSR|S_IRUSR},
1372                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1373                                         &transaction_ops, S_IWUSR|S_IRUSR},
1374                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1375                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1376                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1377                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1378                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1379                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1380                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1381 #ifdef CONFIG_NFSD_V4
1382                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1383                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1384                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1385 #endif
1386                 /* last one */ {""}
1387         };
1388         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1389 }
1390
1391 static int nfsd_get_sb(struct file_system_type *fs_type,
1392         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1393 {
1394         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1395 }
1396
1397 static struct file_system_type nfsd_fs_type = {
1398         .owner          = THIS_MODULE,
1399         .name           = "nfsd",
1400         .get_sb         = nfsd_get_sb,
1401         .kill_sb        = kill_litter_super,
1402 };
1403
1404 #ifdef CONFIG_PROC_FS
1405 static int create_proc_exports_entry(void)
1406 {
1407         struct proc_dir_entry *entry;
1408
1409         entry = proc_mkdir("fs/nfs", NULL);
1410         if (!entry)
1411                 return -ENOMEM;
1412         entry = proc_create("exports", 0, entry, &exports_operations);
1413         if (!entry)
1414                 return -ENOMEM;
1415         return 0;
1416 }
1417 #else /* CONFIG_PROC_FS */
1418 static int create_proc_exports_entry(void)
1419 {
1420         return 0;
1421 }
1422 #endif
1423
1424 static int __init init_nfsd(void)
1425 {
1426         int retval;
1427         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1428
1429         retval = nfs4_state_init(); /* nfs4 locking state */
1430         if (retval)
1431                 return retval;
1432         nfsd_stat_init();       /* Statistics */
1433         retval = nfsd_reply_cache_init();
1434         if (retval)
1435                 goto out_free_stat;
1436         retval = nfsd_export_init();
1437         if (retval)
1438                 goto out_free_cache;
1439         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1440         retval = nfsd_idmap_init();
1441         if (retval)
1442                 goto out_free_lockd;
1443         retval = create_proc_exports_entry();
1444         if (retval)
1445                 goto out_free_idmap;
1446         retval = register_filesystem(&nfsd_fs_type);
1447         if (retval)
1448                 goto out_free_all;
1449         return 0;
1450 out_free_all:
1451         remove_proc_entry("fs/nfs/exports", NULL);
1452         remove_proc_entry("fs/nfs", NULL);
1453 out_free_idmap:
1454         nfsd_idmap_shutdown();
1455 out_free_lockd:
1456         nfsd_lockd_shutdown();
1457         nfsd_export_shutdown();
1458 out_free_cache:
1459         nfsd_reply_cache_shutdown();
1460 out_free_stat:
1461         nfsd_stat_shutdown();
1462         nfsd4_free_slabs();
1463         return retval;
1464 }
1465
1466 static void __exit exit_nfsd(void)
1467 {
1468         nfsd_export_shutdown();
1469         nfsd_reply_cache_shutdown();
1470         remove_proc_entry("fs/nfs/exports", NULL);
1471         remove_proc_entry("fs/nfs", NULL);
1472         nfsd_stat_shutdown();
1473         nfsd_lockd_shutdown();
1474         nfsd_idmap_shutdown();
1475         nfsd4_free_slabs();
1476         unregister_filesystem(&nfsd_fs_type);
1477 }
1478
1479 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1480 MODULE_LICENSE("GPL");
1481 module_init(init_nfsd)
1482 module_exit(exit_nfsd)