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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 #ifdef CONFIG_NFSD_DEPRECATED
26         NFSD_Svc,
27         NFSD_Add,
28         NFSD_Del,
29         NFSD_Export,
30         NFSD_Unexport,
31         NFSD_Getfd,
32         NFSD_Getfs,
33 #endif
34         NFSD_List,
35         NFSD_Export_features,
36         NFSD_Fh,
37         NFSD_FO_UnlockIP,
38         NFSD_FO_UnlockFS,
39         NFSD_Threads,
40         NFSD_Pool_Threads,
41         NFSD_Pool_Stats,
42         NFSD_Versions,
43         NFSD_Ports,
44         NFSD_MaxBlkSize,
45         /*
46          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
47          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
48          */
49 #ifdef CONFIG_NFSD_V4
50         NFSD_Leasetime,
51         NFSD_Gracetime,
52         NFSD_RecoveryDir,
53 #endif
54 };
55
56 /*
57  * write() for these nodes.
58  */
59 #ifdef CONFIG_NFSD_DEPRECATED
60 static ssize_t write_svc(struct file *file, char *buf, size_t size);
61 static ssize_t write_add(struct file *file, char *buf, size_t size);
62 static ssize_t write_del(struct file *file, char *buf, size_t size);
63 static ssize_t write_export(struct file *file, char *buf, size_t size);
64 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
65 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
66 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
67 #endif
68 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
69 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
70 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
71 static ssize_t write_threads(struct file *file, char *buf, size_t size);
72 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
73 static ssize_t write_versions(struct file *file, char *buf, size_t size);
74 static ssize_t write_ports(struct file *file, char *buf, size_t size);
75 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
76 #ifdef CONFIG_NFSD_V4
77 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
78 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
79 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
80 #endif
81
82 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
83 #ifdef CONFIG_NFSD_DEPRECATED
84         [NFSD_Svc] = write_svc,
85         [NFSD_Add] = write_add,
86         [NFSD_Del] = write_del,
87         [NFSD_Export] = write_export,
88         [NFSD_Unexport] = write_unexport,
89         [NFSD_Getfd] = write_getfd,
90         [NFSD_Getfs] = write_getfs,
91 #endif
92         [NFSD_Fh] = write_filehandle,
93         [NFSD_FO_UnlockIP] = write_unlock_ip,
94         [NFSD_FO_UnlockFS] = write_unlock_fs,
95         [NFSD_Threads] = write_threads,
96         [NFSD_Pool_Threads] = write_pool_threads,
97         [NFSD_Versions] = write_versions,
98         [NFSD_Ports] = write_ports,
99         [NFSD_MaxBlkSize] = write_maxblksize,
100 #ifdef CONFIG_NFSD_V4
101         [NFSD_Leasetime] = write_leasetime,
102         [NFSD_Gracetime] = write_gracetime,
103         [NFSD_RecoveryDir] = write_recoverydir,
104 #endif
105 };
106
107 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
108 {
109         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
110         char *data;
111         ssize_t rv;
112
113         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
114                 return -EINVAL;
115
116         data = simple_transaction_get(file, buf, size);
117         if (IS_ERR(data))
118                 return PTR_ERR(data);
119
120         rv =  write_op[ino](file, data, size);
121         if (rv >= 0) {
122                 simple_transaction_set(file, rv);
123                 rv = size;
124         }
125         return rv;
126 }
127
128 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
129 {
130         static int warned;
131         if (file->f_dentry->d_name.name[0] == '.' && !warned) {
132                 printk(KERN_INFO
133                        "Warning: \"%s\" uses deprecated NFSD interface: %s."
134                        "  This will be removed in 2.6.40\n",
135                        current->comm, file->f_dentry->d_name.name);
136                 warned = 1;
137         }
138         if (! file->private_data) {
139                 /* An attempt to read a transaction file without writing
140                  * causes a 0-byte write so that the file can return
141                  * state information
142                  */
143                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
144                 if (rv < 0)
145                         return rv;
146         }
147         return simple_transaction_read(file, buf, size, pos);
148 }
149
150 static const struct file_operations transaction_ops = {
151         .write          = nfsctl_transaction_write,
152         .read           = nfsctl_transaction_read,
153         .release        = simple_transaction_release,
154         .llseek         = default_llseek,
155 };
156
157 static int exports_open(struct inode *inode, struct file *file)
158 {
159         return seq_open(file, &nfs_exports_op);
160 }
161
162 static const struct file_operations exports_operations = {
163         .open           = exports_open,
164         .read           = seq_read,
165         .llseek         = seq_lseek,
166         .release        = seq_release,
167         .owner          = THIS_MODULE,
168 };
169
170 static int export_features_show(struct seq_file *m, void *v)
171 {
172         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
173         return 0;
174 }
175
176 static int export_features_open(struct inode *inode, struct file *file)
177 {
178         return single_open(file, export_features_show, NULL);
179 }
180
181 static struct file_operations export_features_operations = {
182         .open           = export_features_open,
183         .read           = seq_read,
184         .llseek         = seq_lseek,
185         .release        = single_release,
186 };
187
188 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
189 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
190
191 static const struct file_operations pool_stats_operations = {
192         .open           = nfsd_pool_stats_open,
193         .read           = seq_read,
194         .llseek         = seq_lseek,
195         .release        = nfsd_pool_stats_release,
196         .owner          = THIS_MODULE,
197 };
198
199 /*----------------------------------------------------------------------------*/
200 /*
201  * payload - write methods
202  */
203
204 #ifdef CONFIG_NFSD_DEPRECATED
205 /**
206  * write_svc - Start kernel's NFSD server
207  *
208  * Deprecated.  /proc/fs/nfsd/threads is preferred.
209  * Function remains to support old versions of nfs-utils.
210  *
211  * Input:
212  *                      buf:    struct nfsctl_svc
213  *                              svc_port:       port number of this
214  *                                              server's listener
215  *                              svc_nthreads:   number of threads to start
216  *                      size:   size in bytes of passed in nfsctl_svc
217  * Output:
218  *      On success:     returns zero
219  *      On error:       return code is negative errno value
220  */
221 static ssize_t write_svc(struct file *file, char *buf, size_t size)
222 {
223         struct nfsctl_svc *data;
224         int err;
225         if (size < sizeof(*data))
226                 return -EINVAL;
227         data = (struct nfsctl_svc*) buf;
228         err = nfsd_svc(data->svc_port, data->svc_nthreads);
229         if (err < 0)
230                 return err;
231         return 0;
232 }
233
234 /**
235  * write_add - Add or modify client entry in auth unix cache
236  *
237  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
238  * Function remains to support old versions of nfs-utils.
239  *
240  * Input:
241  *                      buf:    struct nfsctl_client
242  *                              cl_ident:       '\0'-terminated C string
243  *                                              containing domain name
244  *                                              of client
245  *                              cl_naddr:       no. of items in cl_addrlist
246  *                              cl_addrlist:    array of client addresses
247  *                              cl_fhkeytype:   ignored
248  *                              cl_fhkeylen:    ignored
249  *                              cl_fhkey:       ignored
250  *                      size:   size in bytes of passed in nfsctl_client
251  * Output:
252  *      On success:     returns zero
253  *      On error:       return code is negative errno value
254  *
255  * Note: Only AF_INET client addresses are passed in, since
256  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
257  */
258 static ssize_t write_add(struct file *file, char *buf, size_t size)
259 {
260         struct nfsctl_client *data;
261         if (size < sizeof(*data))
262                 return -EINVAL;
263         data = (struct nfsctl_client *)buf;
264         return exp_addclient(data);
265 }
266
267 /**
268  * write_del - Remove client from auth unix cache
269  *
270  * Deprecated.  /proc/net/rpc/auth.unix.ip is preferred.
271  * Function remains to support old versions of nfs-utils.
272  *
273  * Input:
274  *                      buf:    struct nfsctl_client
275  *                              cl_ident:       '\0'-terminated C string
276  *                                              containing domain name
277  *                                              of client
278  *                              cl_naddr:       ignored
279  *                              cl_addrlist:    ignored
280  *                              cl_fhkeytype:   ignored
281  *                              cl_fhkeylen:    ignored
282  *                              cl_fhkey:       ignored
283  *                      size:   size in bytes of passed in nfsctl_client
284  * Output:
285  *      On success:     returns zero
286  *      On error:       return code is negative errno value
287  *
288  * Note: Only AF_INET client addresses are passed in, since
289  * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
290  */
291 static ssize_t write_del(struct file *file, char *buf, size_t size)
292 {
293         struct nfsctl_client *data;
294         if (size < sizeof(*data))
295                 return -EINVAL;
296         data = (struct nfsctl_client *)buf;
297         return exp_delclient(data);
298 }
299
300 /**
301  * write_export - Export part or all of a local file system
302  *
303  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
304  * Function remains to support old versions of nfs-utils.
305  *
306  * Input:
307  *                      buf:    struct nfsctl_export
308  *                              ex_client:      '\0'-terminated C string
309  *                                              containing domain name
310  *                                              of client allowed to access
311  *                                              this export
312  *                              ex_path:        '\0'-terminated C string
313  *                                              containing pathname of
314  *                                              directory in local file system
315  *                              ex_dev:         fsid to use for this export
316  *                              ex_ino:         ignored
317  *                              ex_flags:       export flags for this export
318  *                              ex_anon_uid:    UID to use for anonymous
319  *                                              requests
320  *                              ex_anon_gid:    GID to use for anonymous
321  *                                              requests
322  *                      size:   size in bytes of passed in nfsctl_export
323  * Output:
324  *      On success:     returns zero
325  *      On error:       return code is negative errno value
326  */
327 static ssize_t write_export(struct file *file, char *buf, size_t size)
328 {
329         struct nfsctl_export *data;
330         if (size < sizeof(*data))
331                 return -EINVAL;
332         data = (struct nfsctl_export*)buf;
333         return exp_export(data);
334 }
335
336 /**
337  * write_unexport - Unexport a previously exported file system
338  *
339  * Deprecated.  /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
340  * Function remains to support old versions of nfs-utils.
341  *
342  * Input:
343  *                      buf:    struct nfsctl_export
344  *                              ex_client:      '\0'-terminated C string
345  *                                              containing domain name
346  *                                              of client no longer allowed
347  *                                              to access this export
348  *                              ex_path:        '\0'-terminated C string
349  *                                              containing pathname of
350  *                                              directory in local file system
351  *                              ex_dev:         ignored
352  *                              ex_ino:         ignored
353  *                              ex_flags:       ignored
354  *                              ex_anon_uid:    ignored
355  *                              ex_anon_gid:    ignored
356  *                      size:   size in bytes of passed in nfsctl_export
357  * Output:
358  *      On success:     returns zero
359  *      On error:       return code is negative errno value
360  */
361 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
362 {
363         struct nfsctl_export *data;
364
365         if (size < sizeof(*data))
366                 return -EINVAL;
367         data = (struct nfsctl_export*)buf;
368         return exp_unexport(data);
369 }
370
371 /**
372  * write_getfs - Get a variable-length NFS file handle by path
373  *
374  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
375  * Function remains to support old versions of nfs-utils.
376  *
377  * Input:
378  *                      buf:    struct nfsctl_fsparm
379  *                              gd_addr:        socket address of client
380  *                              gd_path:        '\0'-terminated C string
381  *                                              containing pathname of
382  *                                              directory in local file system
383  *                              gd_maxlen:      maximum size of returned file
384  *                                              handle
385  *                      size:   size in bytes of passed in nfsctl_fsparm
386  * Output:
387  *      On success:     passed-in buffer filled with a knfsd_fh structure
388  *                      (a variable-length raw NFS file handle);
389  *                      return code is the size in bytes of the file handle
390  *      On error:       return code is negative errno value
391  *
392  * Note: Only AF_INET client addresses are passed in, since gd_addr
393  * is the same size as a struct sockaddr_in.
394  */
395 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
396 {
397         struct nfsctl_fsparm *data;
398         struct sockaddr_in *sin;
399         struct auth_domain *clp;
400         int err = 0;
401         struct knfsd_fh *res;
402         struct in6_addr in6;
403
404         if (size < sizeof(*data))
405                 return -EINVAL;
406         data = (struct nfsctl_fsparm*)buf;
407         err = -EPROTONOSUPPORT;
408         if (data->gd_addr.sa_family != AF_INET)
409                 goto out;
410         sin = (struct sockaddr_in *)&data->gd_addr;
411         if (data->gd_maxlen > NFS3_FHSIZE)
412                 data->gd_maxlen = NFS3_FHSIZE;
413
414         res = (struct knfsd_fh*)buf;
415
416         exp_readlock();
417
418         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
419
420         clp = auth_unix_lookup(&init_net, &in6);
421         if (!clp)
422                 err = -EPERM;
423         else {
424                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
425                 auth_domain_put(clp);
426         }
427         exp_readunlock();
428         if (err == 0)
429                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
430  out:
431         return err;
432 }
433
434 /**
435  * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
436  *
437  * Deprecated.  /proc/fs/nfsd/filehandle is preferred.
438  * Function remains to support old versions of nfs-utils.
439  *
440  * Input:
441  *                      buf:    struct nfsctl_fdparm
442  *                              gd_addr:        socket address of client
443  *                              gd_path:        '\0'-terminated C string
444  *                                              containing pathname of
445  *                                              directory in local file system
446  *                              gd_version:     fdparm structure version
447  *                      size:   size in bytes of passed in nfsctl_fdparm
448  * Output:
449  *      On success:     passed-in buffer filled with nfsctl_res
450  *                      (a fixed-length raw NFS file handle);
451  *                      return code is the size in bytes of the file handle
452  *      On error:       return code is negative errno value
453  *
454  * Note: Only AF_INET client addresses are passed in, since gd_addr
455  * is the same size as a struct sockaddr_in.
456  */
457 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
458 {
459         struct nfsctl_fdparm *data;
460         struct sockaddr_in *sin;
461         struct auth_domain *clp;
462         int err = 0;
463         struct knfsd_fh fh;
464         char *res;
465         struct in6_addr in6;
466
467         if (size < sizeof(*data))
468                 return -EINVAL;
469         data = (struct nfsctl_fdparm*)buf;
470         err = -EPROTONOSUPPORT;
471         if (data->gd_addr.sa_family != AF_INET)
472                 goto out;
473         err = -EINVAL;
474         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
475                 goto out;
476
477         res = buf;
478         sin = (struct sockaddr_in *)&data->gd_addr;
479         exp_readlock();
480
481         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
482
483         clp = auth_unix_lookup(&init_net, &in6);
484         if (!clp)
485                 err = -EPERM;
486         else {
487                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
488                 auth_domain_put(clp);
489         }
490         exp_readunlock();
491
492         if (err == 0) {
493                 memset(res,0, NFS_FHSIZE);
494                 memcpy(res, &fh.fh_base, fh.fh_size);
495                 err = NFS_FHSIZE;
496         }
497  out:
498         return err;
499 }
500 #endif /* CONFIG_NFSD_DEPRECATED */
501
502 /**
503  * write_unlock_ip - Release all locks used by a client
504  *
505  * Experimental.
506  *
507  * Input:
508  *                      buf:    '\n'-terminated C string containing a
509  *                              presentation format IP address
510  *                      size:   length of C string in @buf
511  * Output:
512  *      On success:     returns zero if all specified locks were released;
513  *                      returns one if one or more locks were not released
514  *      On error:       return code is negative errno value
515  */
516 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
517 {
518         struct sockaddr_storage address;
519         struct sockaddr *sap = (struct sockaddr *)&address;
520         size_t salen = sizeof(address);
521         char *fo_path;
522
523         /* sanity check */
524         if (size == 0)
525                 return -EINVAL;
526
527         if (buf[size-1] != '\n')
528                 return -EINVAL;
529
530         fo_path = buf;
531         if (qword_get(&buf, fo_path, size) < 0)
532                 return -EINVAL;
533
534         if (rpc_pton(fo_path, size, sap, salen) == 0)
535                 return -EINVAL;
536
537         return nlmsvc_unlock_all_by_ip(sap);
538 }
539
540 /**
541  * write_unlock_fs - Release all locks on a local file system
542  *
543  * Experimental.
544  *
545  * Input:
546  *                      buf:    '\n'-terminated C string containing the
547  *                              absolute pathname of a local file system
548  *                      size:   length of C string in @buf
549  * Output:
550  *      On success:     returns zero if all specified locks were released;
551  *                      returns one if one or more locks were not released
552  *      On error:       return code is negative errno value
553  */
554 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
555 {
556         struct path path;
557         char *fo_path;
558         int error;
559
560         /* sanity check */
561         if (size == 0)
562                 return -EINVAL;
563
564         if (buf[size-1] != '\n')
565                 return -EINVAL;
566
567         fo_path = buf;
568         if (qword_get(&buf, fo_path, size) < 0)
569                 return -EINVAL;
570
571         error = kern_path(fo_path, 0, &path);
572         if (error)
573                 return error;
574
575         /*
576          * XXX: Needs better sanity checking.  Otherwise we could end up
577          * releasing locks on the wrong file system.
578          *
579          * For example:
580          * 1.  Does the path refer to a directory?
581          * 2.  Is that directory a mount point, or
582          * 3.  Is that directory the root of an exported file system?
583          */
584         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
585
586         path_put(&path);
587         return error;
588 }
589
590 /**
591  * write_filehandle - Get a variable-length NFS file handle by path
592  *
593  * On input, the buffer contains a '\n'-terminated C string comprised of
594  * three alphanumeric words separated by whitespace.  The string may
595  * contain escape sequences.
596  *
597  * Input:
598  *                      buf:
599  *                              domain:         client domain name
600  *                              path:           export pathname
601  *                              maxsize:        numeric maximum size of
602  *                                              @buf
603  *                      size:   length of C string in @buf
604  * Output:
605  *      On success:     passed-in buffer filled with '\n'-terminated C
606  *                      string containing a ASCII hex text version
607  *                      of the NFS file handle;
608  *                      return code is the size in bytes of the string
609  *      On error:       return code is negative errno value
610  */
611 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
612 {
613         char *dname, *path;
614         int uninitialized_var(maxsize);
615         char *mesg = buf;
616         int len;
617         struct auth_domain *dom;
618         struct knfsd_fh fh;
619
620         if (size == 0)
621                 return -EINVAL;
622
623         if (buf[size-1] != '\n')
624                 return -EINVAL;
625         buf[size-1] = 0;
626
627         dname = mesg;
628         len = qword_get(&mesg, dname, size);
629         if (len <= 0)
630                 return -EINVAL;
631         
632         path = dname+len+1;
633         len = qword_get(&mesg, path, size);
634         if (len <= 0)
635                 return -EINVAL;
636
637         len = get_int(&mesg, &maxsize);
638         if (len)
639                 return len;
640
641         if (maxsize < NFS_FHSIZE)
642                 return -EINVAL;
643         if (maxsize > NFS3_FHSIZE)
644                 maxsize = NFS3_FHSIZE;
645
646         if (qword_get(&mesg, mesg, size)>0)
647                 return -EINVAL;
648
649         /* we have all the words, they are in buf.. */
650         dom = unix_domain_find(dname);
651         if (!dom)
652                 return -ENOMEM;
653
654         len = exp_rootfh(dom, path, &fh,  maxsize);
655         auth_domain_put(dom);
656         if (len)
657                 return len;
658         
659         mesg = buf;
660         len = SIMPLE_TRANSACTION_LIMIT;
661         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
662         mesg[-1] = '\n';
663         return mesg - buf;      
664 }
665
666 /**
667  * write_threads - Start NFSD, or report the current number of running threads
668  *
669  * Input:
670  *                      buf:            ignored
671  *                      size:           zero
672  * Output:
673  *      On success:     passed-in buffer filled with '\n'-terminated C
674  *                      string numeric value representing the number of
675  *                      running NFSD threads;
676  *                      return code is the size in bytes of the string
677  *      On error:       return code is zero
678  *
679  * OR
680  *
681  * Input:
682  *                      buf:            C string containing an unsigned
683  *                                      integer value representing the
684  *                                      number of NFSD threads to start
685  *                      size:           non-zero length of C string in @buf
686  * Output:
687  *      On success:     NFS service is started;
688  *                      passed-in buffer filled with '\n'-terminated C
689  *                      string numeric value representing the number of
690  *                      running NFSD threads;
691  *                      return code is the size in bytes of the string
692  *      On error:       return code is zero or a negative errno value
693  */
694 static ssize_t write_threads(struct file *file, char *buf, size_t size)
695 {
696         char *mesg = buf;
697         int rv;
698         if (size > 0) {
699                 int newthreads;
700                 rv = get_int(&mesg, &newthreads);
701                 if (rv)
702                         return rv;
703                 if (newthreads < 0)
704                         return -EINVAL;
705                 rv = nfsd_svc(NFS_PORT, newthreads);
706                 if (rv < 0)
707                         return rv;
708         } else
709                 rv = nfsd_nrthreads();
710
711         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
712 }
713
714 /**
715  * write_pool_threads - Set or report the current number of threads per pool
716  *
717  * Input:
718  *                      buf:            ignored
719  *                      size:           zero
720  *
721  * OR
722  *
723  * Input:
724  *                      buf:            C string containing whitespace-
725  *                                      separated unsigned integer values
726  *                                      representing the number of NFSD
727  *                                      threads to start in each pool
728  *                      size:           non-zero length of C string in @buf
729  * Output:
730  *      On success:     passed-in buffer filled with '\n'-terminated C
731  *                      string containing integer values representing the
732  *                      number of NFSD threads in each pool;
733  *                      return code is the size in bytes of the string
734  *      On error:       return code is zero or a negative errno value
735  */
736 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
737 {
738         /* if size > 0, look for an array of number of threads per node
739          * and apply them  then write out number of threads per node as reply
740          */
741         char *mesg = buf;
742         int i;
743         int rv;
744         int len;
745         int npools;
746         int *nthreads;
747
748         mutex_lock(&nfsd_mutex);
749         npools = nfsd_nrpools();
750         if (npools == 0) {
751                 /*
752                  * NFS is shut down.  The admin can start it by
753                  * writing to the threads file but NOT the pool_threads
754                  * file, sorry.  Report zero threads.
755                  */
756                 mutex_unlock(&nfsd_mutex);
757                 strcpy(buf, "0\n");
758                 return strlen(buf);
759         }
760
761         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
762         rv = -ENOMEM;
763         if (nthreads == NULL)
764                 goto out_free;
765
766         if (size > 0) {
767                 for (i = 0; i < npools; i++) {
768                         rv = get_int(&mesg, &nthreads[i]);
769                         if (rv == -ENOENT)
770                                 break;          /* fewer numbers than pools */
771                         if (rv)
772                                 goto out_free;  /* syntax error */
773                         rv = -EINVAL;
774                         if (nthreads[i] < 0)
775                                 goto out_free;
776                 }
777                 rv = nfsd_set_nrthreads(i, nthreads);
778                 if (rv)
779                         goto out_free;
780         }
781
782         rv = nfsd_get_nrthreads(npools, nthreads);
783         if (rv)
784                 goto out_free;
785
786         mesg = buf;
787         size = SIMPLE_TRANSACTION_LIMIT;
788         for (i = 0; i < npools && size > 0; i++) {
789                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
790                 len = strlen(mesg);
791                 size -= len;
792                 mesg += len;
793         }
794         rv = mesg - buf;
795 out_free:
796         kfree(nthreads);
797         mutex_unlock(&nfsd_mutex);
798         return rv;
799 }
800
801 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
802 {
803         char *mesg = buf;
804         char *vers, *minorp, sign;
805         int len, num, remaining;
806         unsigned minor;
807         ssize_t tlen = 0;
808         char *sep;
809
810         if (size>0) {
811                 if (nfsd_serv)
812                         /* Cannot change versions without updating
813                          * nfsd_serv->sv_xdrsize, and reallocing
814                          * rq_argp and rq_resp
815                          */
816                         return -EBUSY;
817                 if (buf[size-1] != '\n')
818                         return -EINVAL;
819                 buf[size-1] = 0;
820
821                 vers = mesg;
822                 len = qword_get(&mesg, vers, size);
823                 if (len <= 0) return -EINVAL;
824                 do {
825                         sign = *vers;
826                         if (sign == '+' || sign == '-')
827                                 num = simple_strtol((vers+1), &minorp, 0);
828                         else
829                                 num = simple_strtol(vers, &minorp, 0);
830                         if (*minorp == '.') {
831                                 if (num < 4)
832                                         return -EINVAL;
833                                 minor = simple_strtoul(minorp+1, NULL, 0);
834                                 if (minor == 0)
835                                         return -EINVAL;
836                                 if (nfsd_minorversion(minor, sign == '-' ?
837                                                      NFSD_CLEAR : NFSD_SET) < 0)
838                                         return -EINVAL;
839                                 goto next;
840                         }
841                         switch(num) {
842                         case 2:
843                         case 3:
844                         case 4:
845                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
846                                 break;
847                         default:
848                                 return -EINVAL;
849                         }
850                 next:
851                         vers += len + 1;
852                 } while ((len = qword_get(&mesg, vers, size)) > 0);
853                 /* If all get turned off, turn them back on, as
854                  * having no versions is BAD
855                  */
856                 nfsd_reset_versions();
857         }
858
859         /* Now write current state into reply buffer */
860         len = 0;
861         sep = "";
862         remaining = SIMPLE_TRANSACTION_LIMIT;
863         for (num=2 ; num <= 4 ; num++)
864                 if (nfsd_vers(num, NFSD_AVAIL)) {
865                         len = snprintf(buf, remaining, "%s%c%d", sep,
866                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
867                                        num);
868                         sep = " ";
869
870                         if (len > remaining)
871                                 break;
872                         remaining -= len;
873                         buf += len;
874                         tlen += len;
875                 }
876         if (nfsd_vers(4, NFSD_AVAIL))
877                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
878                      minor++) {
879                         len = snprintf(buf, remaining, " %c4.%u",
880                                         (nfsd_vers(4, NFSD_TEST) &&
881                                          nfsd_minorversion(minor, NFSD_TEST)) ?
882                                                 '+' : '-',
883                                         minor);
884
885                         if (len > remaining)
886                                 break;
887                         remaining -= len;
888                         buf += len;
889                         tlen += len;
890                 }
891
892         len = snprintf(buf, remaining, "\n");
893         if (len > remaining)
894                 return -EINVAL;
895         return tlen + len;
896 }
897
898 /**
899  * write_versions - Set or report the available NFS protocol versions
900  *
901  * Input:
902  *                      buf:            ignored
903  *                      size:           zero
904  * Output:
905  *      On success:     passed-in buffer filled with '\n'-terminated C
906  *                      string containing positive or negative integer
907  *                      values representing the current status of each
908  *                      protocol version;
909  *                      return code is the size in bytes of the string
910  *      On error:       return code is zero or a negative errno value
911  *
912  * OR
913  *
914  * Input:
915  *                      buf:            C string containing whitespace-
916  *                                      separated positive or negative
917  *                                      integer values representing NFS
918  *                                      protocol versions to enable ("+n")
919  *                                      or disable ("-n")
920  *                      size:           non-zero length of C string in @buf
921  * Output:
922  *      On success:     status of zero or more protocol versions has
923  *                      been updated; passed-in buffer filled with
924  *                      '\n'-terminated C string containing positive
925  *                      or negative integer values representing the
926  *                      current status of each protocol version;
927  *                      return code is the size in bytes of the string
928  *      On error:       return code is zero or a negative errno value
929  */
930 static ssize_t write_versions(struct file *file, char *buf, size_t size)
931 {
932         ssize_t rv;
933
934         mutex_lock(&nfsd_mutex);
935         rv = __write_versions(file, buf, size);
936         mutex_unlock(&nfsd_mutex);
937         return rv;
938 }
939
940 /*
941  * Zero-length write.  Return a list of NFSD's current listener
942  * transports.
943  */
944 static ssize_t __write_ports_names(char *buf)
945 {
946         if (nfsd_serv == NULL)
947                 return 0;
948         return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
949 }
950
951 /*
952  * A single 'fd' number was written, in which case it must be for
953  * a socket of a supported family/protocol, and we use it as an
954  * nfsd listener.
955  */
956 static ssize_t __write_ports_addfd(char *buf)
957 {
958         char *mesg = buf;
959         int fd, err;
960
961         err = get_int(&mesg, &fd);
962         if (err != 0 || fd < 0)
963                 return -EINVAL;
964
965         err = nfsd_create_serv();
966         if (err != 0)
967                 return err;
968
969         err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
970         if (err < 0) {
971                 svc_destroy(nfsd_serv);
972                 return err;
973         }
974
975         /* Decrease the count, but don't shut down the service */
976         nfsd_serv->sv_nrthreads--;
977         return err;
978 }
979
980 /*
981  * A '-' followed by the 'name' of a socket means we close the socket.
982  */
983 static ssize_t __write_ports_delfd(char *buf)
984 {
985         char *toclose;
986         int len = 0;
987
988         toclose = kstrdup(buf + 1, GFP_KERNEL);
989         if (toclose == NULL)
990                 return -ENOMEM;
991
992         if (nfsd_serv != NULL)
993                 len = svc_sock_names(nfsd_serv, buf,
994                                         SIMPLE_TRANSACTION_LIMIT, toclose);
995         kfree(toclose);
996         return len;
997 }
998
999 /*
1000  * A transport listener is added by writing it's transport name and
1001  * a port number.
1002  */
1003 static ssize_t __write_ports_addxprt(char *buf)
1004 {
1005         char transport[16];
1006         struct svc_xprt *xprt;
1007         int port, err;
1008
1009         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
1010                 return -EINVAL;
1011
1012         if (port < 1 || port > USHRT_MAX)
1013                 return -EINVAL;
1014
1015         err = nfsd_create_serv();
1016         if (err != 0)
1017                 return err;
1018
1019         err = svc_create_xprt(nfsd_serv, transport, &init_net,
1020                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
1021         if (err < 0)
1022                 goto out_err;
1023
1024         err = svc_create_xprt(nfsd_serv, transport, &init_net,
1025                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1026         if (err < 0 && err != -EAFNOSUPPORT)
1027                 goto out_close;
1028
1029         /* Decrease the count, but don't shut down the service */
1030         nfsd_serv->sv_nrthreads--;
1031         return 0;
1032 out_close:
1033         xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1034         if (xprt != NULL) {
1035                 svc_close_xprt(xprt);
1036                 svc_xprt_put(xprt);
1037         }
1038 out_err:
1039         svc_destroy(nfsd_serv);
1040         return err;
1041 }
1042
1043 /*
1044  * A transport listener is removed by writing a "-", it's transport
1045  * name, and it's port number.
1046  */
1047 static ssize_t __write_ports_delxprt(char *buf)
1048 {
1049         struct svc_xprt *xprt;
1050         char transport[16];
1051         int port;
1052
1053         if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1054                 return -EINVAL;
1055
1056         if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
1057                 return -EINVAL;
1058
1059         xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1060         if (xprt == NULL)
1061                 return -ENOTCONN;
1062
1063         svc_close_xprt(xprt);
1064         svc_xprt_put(xprt);
1065         return 0;
1066 }
1067
1068 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1069 {
1070         if (size == 0)
1071                 return __write_ports_names(buf);
1072
1073         if (isdigit(buf[0]))
1074                 return __write_ports_addfd(buf);
1075
1076         if (buf[0] == '-' && isdigit(buf[1]))
1077                 return __write_ports_delfd(buf);
1078
1079         if (isalpha(buf[0]))
1080                 return __write_ports_addxprt(buf);
1081
1082         if (buf[0] == '-' && isalpha(buf[1]))
1083                 return __write_ports_delxprt(buf);
1084
1085         return -EINVAL;
1086 }
1087
1088 /**
1089  * write_ports - Pass a socket file descriptor or transport name to listen on
1090  *
1091  * Input:
1092  *                      buf:            ignored
1093  *                      size:           zero
1094  * Output:
1095  *      On success:     passed-in buffer filled with a '\n'-terminated C
1096  *                      string containing a whitespace-separated list of
1097  *                      named NFSD listeners;
1098  *                      return code is the size in bytes of the string
1099  *      On error:       return code is zero or a negative errno value
1100  *
1101  * OR
1102  *
1103  * Input:
1104  *                      buf:            C string containing an unsigned
1105  *                                      integer value representing a bound
1106  *                                      but unconnected socket that is to be
1107  *                                      used as an NFSD listener; listen(3)
1108  *                                      must be called for a SOCK_STREAM
1109  *                                      socket, otherwise it is ignored
1110  *                      size:           non-zero length of C string in @buf
1111  * Output:
1112  *      On success:     NFS service is started;
1113  *                      passed-in buffer filled with a '\n'-terminated C
1114  *                      string containing a unique alphanumeric name of
1115  *                      the listener;
1116  *                      return code is the size in bytes of the string
1117  *      On error:       return code is a negative errno value
1118  *
1119  * OR
1120  *
1121  * Input:
1122  *                      buf:            C string containing a "-" followed
1123  *                                      by an integer value representing a
1124  *                                      previously passed in socket file
1125  *                                      descriptor
1126  *                      size:           non-zero length of C string in @buf
1127  * Output:
1128  *      On success:     NFS service no longer listens on that socket;
1129  *                      passed-in buffer filled with a '\n'-terminated C
1130  *                      string containing a unique name of the listener;
1131  *                      return code is the size in bytes of the string
1132  *      On error:       return code is a negative errno value
1133  *
1134  * OR
1135  *
1136  * Input:
1137  *                      buf:            C string containing a transport
1138  *                                      name and an unsigned integer value
1139  *                                      representing the port to listen on,
1140  *                                      separated by whitespace
1141  *                      size:           non-zero length of C string in @buf
1142  * Output:
1143  *      On success:     returns zero; NFS service is started
1144  *      On error:       return code is a negative errno value
1145  *
1146  * OR
1147  *
1148  * Input:
1149  *                      buf:            C string containing a "-" followed
1150  *                                      by a transport name and an unsigned
1151  *                                      integer value representing the port
1152  *                                      to listen on, separated by whitespace
1153  *                      size:           non-zero length of C string in @buf
1154  * Output:
1155  *      On success:     returns zero; NFS service no longer listens
1156  *                      on that transport
1157  *      On error:       return code is a negative errno value
1158  */
1159 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1160 {
1161         ssize_t rv;
1162
1163         mutex_lock(&nfsd_mutex);
1164         rv = __write_ports(file, buf, size);
1165         mutex_unlock(&nfsd_mutex);
1166         return rv;
1167 }
1168
1169
1170 int nfsd_max_blksize;
1171
1172 /**
1173  * write_maxblksize - Set or report the current NFS blksize
1174  *
1175  * Input:
1176  *                      buf:            ignored
1177  *                      size:           zero
1178  *
1179  * OR
1180  *
1181  * Input:
1182  *                      buf:            C string containing an unsigned
1183  *                                      integer value representing the new
1184  *                                      NFS blksize
1185  *                      size:           non-zero length of C string in @buf
1186  * Output:
1187  *      On success:     passed-in buffer filled with '\n'-terminated C string
1188  *                      containing numeric value of the current NFS blksize
1189  *                      setting;
1190  *                      return code is the size in bytes of the string
1191  *      On error:       return code is zero or a negative errno value
1192  */
1193 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1194 {
1195         char *mesg = buf;
1196         if (size > 0) {
1197                 int bsize;
1198                 int rv = get_int(&mesg, &bsize);
1199                 if (rv)
1200                         return rv;
1201                 /* force bsize into allowed range and
1202                  * required alignment.
1203                  */
1204                 if (bsize < 1024)
1205                         bsize = 1024;
1206                 if (bsize > NFSSVC_MAXBLKSIZE)
1207                         bsize = NFSSVC_MAXBLKSIZE;
1208                 bsize &= ~(1024-1);
1209                 mutex_lock(&nfsd_mutex);
1210                 if (nfsd_serv) {
1211                         mutex_unlock(&nfsd_mutex);
1212                         return -EBUSY;
1213                 }
1214                 nfsd_max_blksize = bsize;
1215                 mutex_unlock(&nfsd_mutex);
1216         }
1217
1218         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1219                                                         nfsd_max_blksize);
1220 }
1221
1222 #ifdef CONFIG_NFSD_V4
1223 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1224 {
1225         char *mesg = buf;
1226         int rv, i;
1227
1228         if (size > 0) {
1229                 if (nfsd_serv)
1230                         return -EBUSY;
1231                 rv = get_int(&mesg, &i);
1232                 if (rv)
1233                         return rv;
1234                 /*
1235                  * Some sanity checking.  We don't have a reason for
1236                  * these particular numbers, but problems with the
1237                  * extremes are:
1238                  *      - Too short: the briefest network outage may
1239                  *        cause clients to lose all their locks.  Also,
1240                  *        the frequent polling may be wasteful.
1241                  *      - Too long: do you really want reboot recovery
1242                  *        to take more than an hour?  Or to make other
1243                  *        clients wait an hour before being able to
1244                  *        revoke a dead client's locks?
1245                  */
1246                 if (i < 10 || i > 3600)
1247                         return -EINVAL;
1248                 *time = i;
1249         }
1250
1251         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
1252 }
1253
1254 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
1255 {
1256         ssize_t rv;
1257
1258         mutex_lock(&nfsd_mutex);
1259         rv = __nfsd4_write_time(file, buf, size, time);
1260         mutex_unlock(&nfsd_mutex);
1261         return rv;
1262 }
1263
1264 /**
1265  * write_leasetime - Set or report the current NFSv4 lease time
1266  *
1267  * Input:
1268  *                      buf:            ignored
1269  *                      size:           zero
1270  *
1271  * OR
1272  *
1273  * Input:
1274  *                      buf:            C string containing an unsigned
1275  *                                      integer value representing the new
1276  *                                      NFSv4 lease expiry time
1277  *                      size:           non-zero length of C string in @buf
1278  * Output:
1279  *      On success:     passed-in buffer filled with '\n'-terminated C
1280  *                      string containing unsigned integer value of the
1281  *                      current lease expiry time;
1282  *                      return code is the size in bytes of the string
1283  *      On error:       return code is zero or a negative errno value
1284  */
1285 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1286 {
1287         return nfsd4_write_time(file, buf, size, &nfsd4_lease);
1288 }
1289
1290 /**
1291  * write_gracetime - Set or report current NFSv4 grace period time
1292  *
1293  * As above, but sets the time of the NFSv4 grace period.
1294  *
1295  * Note this should never be set to less than the *previous*
1296  * lease-period time, but we don't try to enforce this.  (In the common
1297  * case (a new boot), we don't know what the previous lease time was
1298  * anyway.)
1299  */
1300 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1301 {
1302         return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1303 }
1304
1305 extern char *nfs4_recoverydir(void);
1306
1307 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1308 {
1309         char *mesg = buf;
1310         char *recdir;
1311         int len, status;
1312
1313         if (size > 0) {
1314                 if (nfsd_serv)
1315                         return -EBUSY;
1316                 if (size > PATH_MAX || buf[size-1] != '\n')
1317                         return -EINVAL;
1318                 buf[size-1] = 0;
1319
1320                 recdir = mesg;
1321                 len = qword_get(&mesg, recdir, size);
1322                 if (len <= 0)
1323                         return -EINVAL;
1324
1325                 status = nfs4_reset_recoverydir(recdir);
1326                 if (status)
1327                         return status;
1328         }
1329
1330         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1331                                                         nfs4_recoverydir());
1332 }
1333
1334 /**
1335  * write_recoverydir - Set or report the pathname of the recovery directory
1336  *
1337  * Input:
1338  *                      buf:            ignored
1339  *                      size:           zero
1340  *
1341  * OR
1342  *
1343  * Input:
1344  *                      buf:            C string containing the pathname
1345  *                                      of the directory on a local file
1346  *                                      system containing permanent NFSv4
1347  *                                      recovery data
1348  *                      size:           non-zero length of C string in @buf
1349  * Output:
1350  *      On success:     passed-in buffer filled with '\n'-terminated C string
1351  *                      containing the current recovery pathname setting;
1352  *                      return code is the size in bytes of the string
1353  *      On error:       return code is zero or a negative errno value
1354  */
1355 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1356 {
1357         ssize_t rv;
1358
1359         mutex_lock(&nfsd_mutex);
1360         rv = __write_recoverydir(file, buf, size);
1361         mutex_unlock(&nfsd_mutex);
1362         return rv;
1363 }
1364
1365 #endif
1366
1367 /*----------------------------------------------------------------------------*/
1368 /*
1369  *      populating the filesystem.
1370  */
1371
1372 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1373 {
1374         static struct tree_descr nfsd_files[] = {
1375 #ifdef CONFIG_NFSD_DEPRECATED
1376                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1377                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1378                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1379                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1380                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1381                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1382                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1383 #endif
1384                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1385                 [NFSD_Export_features] = {"export_features",
1386                                         &export_features_operations, S_IRUGO},
1387                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1388                                         &transaction_ops, S_IWUSR|S_IRUSR},
1389                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1390                                         &transaction_ops, S_IWUSR|S_IRUSR},
1391                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1392                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1393                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1394                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1395                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1396                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1397                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1398 #ifdef CONFIG_NFSD_V4
1399                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1400                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1401                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1402 #endif
1403                 /* last one */ {""}
1404         };
1405         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1406 }
1407
1408 static int nfsd_get_sb(struct file_system_type *fs_type,
1409         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1410 {
1411         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1412 }
1413
1414 static struct file_system_type nfsd_fs_type = {
1415         .owner          = THIS_MODULE,
1416         .name           = "nfsd",
1417         .get_sb         = nfsd_get_sb,
1418         .kill_sb        = kill_litter_super,
1419 };
1420
1421 #ifdef CONFIG_PROC_FS
1422 static int create_proc_exports_entry(void)
1423 {
1424         struct proc_dir_entry *entry;
1425
1426         entry = proc_mkdir("fs/nfs", NULL);
1427         if (!entry)
1428                 return -ENOMEM;
1429         entry = proc_create("exports", 0, entry, &exports_operations);
1430         if (!entry)
1431                 return -ENOMEM;
1432         return 0;
1433 }
1434 #else /* CONFIG_PROC_FS */
1435 static int create_proc_exports_entry(void)
1436 {
1437         return 0;
1438 }
1439 #endif
1440
1441 static int __init init_nfsd(void)
1442 {
1443         int retval;
1444         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1445
1446         retval = nfs4_state_init(); /* nfs4 locking state */
1447         if (retval)
1448                 return retval;
1449         nfsd_stat_init();       /* Statistics */
1450         retval = nfsd_reply_cache_init();
1451         if (retval)
1452                 goto out_free_stat;
1453         retval = nfsd_export_init();
1454         if (retval)
1455                 goto out_free_cache;
1456         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1457         retval = nfsd_idmap_init();
1458         if (retval)
1459                 goto out_free_lockd;
1460         retval = create_proc_exports_entry();
1461         if (retval)
1462                 goto out_free_idmap;
1463         retval = register_filesystem(&nfsd_fs_type);
1464         if (retval)
1465                 goto out_free_all;
1466         return 0;
1467 out_free_all:
1468         remove_proc_entry("fs/nfs/exports", NULL);
1469         remove_proc_entry("fs/nfs", NULL);
1470 out_free_idmap:
1471         nfsd_idmap_shutdown();
1472 out_free_lockd:
1473         nfsd_lockd_shutdown();
1474         nfsd_export_shutdown();
1475 out_free_cache:
1476         nfsd_reply_cache_shutdown();
1477 out_free_stat:
1478         nfsd_stat_shutdown();
1479         nfsd4_free_slabs();
1480         return retval;
1481 }
1482
1483 static void __exit exit_nfsd(void)
1484 {
1485         nfsd_export_shutdown();
1486         nfsd_reply_cache_shutdown();
1487         remove_proc_entry("fs/nfs/exports", NULL);
1488         remove_proc_entry("fs/nfs", NULL);
1489         nfsd_stat_shutdown();
1490         nfsd_lockd_shutdown();
1491         nfsd_idmap_shutdown();
1492         nfsd4_free_slabs();
1493         unregister_filesystem(&nfsd_fs_type);
1494 }
1495
1496 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1497 MODULE_LICENSE("GPL");
1498 module_init(init_nfsd)
1499 module_exit(exit_nfsd)