Merge branches 'fixes', 'cleanups' and 'boards'
[linux-2.6] / fs / nfsd / nfsctl.c
1 /*
2  * linux/fs/nfsd/nfsctl.c
3  *
4  * Syscall interface to knfsd.
5  *
6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7  */
8
9 #include <linux/module.h>
10
11 #include <linux/linkage.h>
12 #include <linux/time.h>
13 #include <linux/errno.h>
14 #include <linux/fs.h>
15 #include <linux/namei.h>
16 #include <linux/fcntl.h>
17 #include <linux/net.h>
18 #include <linux/in.h>
19 #include <linux/syscalls.h>
20 #include <linux/unistd.h>
21 #include <linux/slab.h>
22 #include <linux/proc_fs.h>
23 #include <linux/seq_file.h>
24 #include <linux/pagemap.h>
25 #include <linux/init.h>
26 #include <linux/inet.h>
27 #include <linux/string.h>
28 #include <linux/smp_lock.h>
29 #include <linux/ctype.h>
30
31 #include <linux/nfs.h>
32 #include <linux/nfsd_idmap.h>
33 #include <linux/lockd/bind.h>
34 #include <linux/sunrpc/svc.h>
35 #include <linux/sunrpc/svcsock.h>
36 #include <linux/nfsd/nfsd.h>
37 #include <linux/nfsd/cache.h>
38 #include <linux/nfsd/xdr.h>
39 #include <linux/nfsd/syscall.h>
40 #include <linux/lockd/lockd.h>
41
42 #include <asm/uaccess.h>
43 #include <net/ipv6.h>
44
45 /*
46  *      We have a single directory with 9 nodes in it.
47  */
48 enum {
49         NFSD_Root = 1,
50         NFSD_Svc,
51         NFSD_Add,
52         NFSD_Del,
53         NFSD_Export,
54         NFSD_Unexport,
55         NFSD_Getfd,
56         NFSD_Getfs,
57         NFSD_List,
58         NFSD_Fh,
59         NFSD_FO_UnlockIP,
60         NFSD_FO_UnlockFS,
61         NFSD_Threads,
62         NFSD_Pool_Threads,
63         NFSD_Versions,
64         NFSD_Ports,
65         NFSD_MaxBlkSize,
66         /*
67          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
68          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
69          */
70 #ifdef CONFIG_NFSD_V4
71         NFSD_Leasetime,
72         NFSD_RecoveryDir,
73 #endif
74 };
75
76 /*
77  * write() for these nodes.
78  */
79 static ssize_t write_svc(struct file *file, char *buf, size_t size);
80 static ssize_t write_add(struct file *file, char *buf, size_t size);
81 static ssize_t write_del(struct file *file, char *buf, size_t size);
82 static ssize_t write_export(struct file *file, char *buf, size_t size);
83 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
84 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
85 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
86 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
87 static ssize_t write_threads(struct file *file, char *buf, size_t size);
88 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
89 static ssize_t write_versions(struct file *file, char *buf, size_t size);
90 static ssize_t write_ports(struct file *file, char *buf, size_t size);
91 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
92 #ifdef CONFIG_NFSD_V4
93 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
94 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
95 #endif
96
97 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size);
98 static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size);
99
100 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
101         [NFSD_Svc] = write_svc,
102         [NFSD_Add] = write_add,
103         [NFSD_Del] = write_del,
104         [NFSD_Export] = write_export,
105         [NFSD_Unexport] = write_unexport,
106         [NFSD_Getfd] = write_getfd,
107         [NFSD_Getfs] = write_getfs,
108         [NFSD_Fh] = write_filehandle,
109         [NFSD_FO_UnlockIP] = failover_unlock_ip,
110         [NFSD_FO_UnlockFS] = failover_unlock_fs,
111         [NFSD_Threads] = write_threads,
112         [NFSD_Pool_Threads] = write_pool_threads,
113         [NFSD_Versions] = write_versions,
114         [NFSD_Ports] = write_ports,
115         [NFSD_MaxBlkSize] = write_maxblksize,
116 #ifdef CONFIG_NFSD_V4
117         [NFSD_Leasetime] = write_leasetime,
118         [NFSD_RecoveryDir] = write_recoverydir,
119 #endif
120 };
121
122 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
123 {
124         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
125         char *data;
126         ssize_t rv;
127
128         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
129                 return -EINVAL;
130
131         data = simple_transaction_get(file, buf, size);
132         if (IS_ERR(data))
133                 return PTR_ERR(data);
134
135         rv =  write_op[ino](file, data, size);
136         if (rv >= 0) {
137                 simple_transaction_set(file, rv);
138                 rv = size;
139         }
140         return rv;
141 }
142
143 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
144 {
145         if (! file->private_data) {
146                 /* An attempt to read a transaction file without writing
147                  * causes a 0-byte write so that the file can return
148                  * state information
149                  */
150                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
151                 if (rv < 0)
152                         return rv;
153         }
154         return simple_transaction_read(file, buf, size, pos);
155 }
156
157 static const struct file_operations transaction_ops = {
158         .write          = nfsctl_transaction_write,
159         .read           = nfsctl_transaction_read,
160         .release        = simple_transaction_release,
161 };
162
163 static int exports_open(struct inode *inode, struct file *file)
164 {
165         return seq_open(file, &nfs_exports_op);
166 }
167
168 static const struct file_operations exports_operations = {
169         .open           = exports_open,
170         .read           = seq_read,
171         .llseek         = seq_lseek,
172         .release        = seq_release,
173         .owner          = THIS_MODULE,
174 };
175
176 /*----------------------------------------------------------------------------*/
177 /*
178  * payload - write methods
179  * If the method has a response, the response should be put in buf,
180  * and the length returned.  Otherwise return 0 or and -error.
181  */
182
183 static ssize_t write_svc(struct file *file, char *buf, size_t size)
184 {
185         struct nfsctl_svc *data;
186         if (size < sizeof(*data))
187                 return -EINVAL;
188         data = (struct nfsctl_svc*) buf;
189         return nfsd_svc(data->svc_port, data->svc_nthreads);
190 }
191
192 static ssize_t write_add(struct file *file, char *buf, size_t size)
193 {
194         struct nfsctl_client *data;
195         if (size < sizeof(*data))
196                 return -EINVAL;
197         data = (struct nfsctl_client *)buf;
198         return exp_addclient(data);
199 }
200
201 static ssize_t write_del(struct file *file, char *buf, size_t size)
202 {
203         struct nfsctl_client *data;
204         if (size < sizeof(*data))
205                 return -EINVAL;
206         data = (struct nfsctl_client *)buf;
207         return exp_delclient(data);
208 }
209
210 static ssize_t write_export(struct file *file, char *buf, size_t size)
211 {
212         struct nfsctl_export *data;
213         if (size < sizeof(*data))
214                 return -EINVAL;
215         data = (struct nfsctl_export*)buf;
216         return exp_export(data);
217 }
218
219 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
220 {
221         struct nfsctl_export *data;
222
223         if (size < sizeof(*data))
224                 return -EINVAL;
225         data = (struct nfsctl_export*)buf;
226         return exp_unexport(data);
227 }
228
229 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
230 {
231         struct nfsctl_fsparm *data;
232         struct sockaddr_in *sin;
233         struct auth_domain *clp;
234         int err = 0;
235         struct knfsd_fh *res;
236         struct in6_addr in6;
237
238         if (size < sizeof(*data))
239                 return -EINVAL;
240         data = (struct nfsctl_fsparm*)buf;
241         err = -EPROTONOSUPPORT;
242         if (data->gd_addr.sa_family != AF_INET)
243                 goto out;
244         sin = (struct sockaddr_in *)&data->gd_addr;
245         if (data->gd_maxlen > NFS3_FHSIZE)
246                 data->gd_maxlen = NFS3_FHSIZE;
247
248         res = (struct knfsd_fh*)buf;
249
250         exp_readlock();
251
252         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
253
254         clp = auth_unix_lookup(&in6);
255         if (!clp)
256                 err = -EPERM;
257         else {
258                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
259                 auth_domain_put(clp);
260         }
261         exp_readunlock();
262         if (err == 0)
263                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
264  out:
265         return err;
266 }
267
268 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
269 {
270         struct nfsctl_fdparm *data;
271         struct sockaddr_in *sin;
272         struct auth_domain *clp;
273         int err = 0;
274         struct knfsd_fh fh;
275         char *res;
276         struct in6_addr in6;
277
278         if (size < sizeof(*data))
279                 return -EINVAL;
280         data = (struct nfsctl_fdparm*)buf;
281         err = -EPROTONOSUPPORT;
282         if (data->gd_addr.sa_family != AF_INET)
283                 goto out;
284         err = -EINVAL;
285         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
286                 goto out;
287
288         res = buf;
289         sin = (struct sockaddr_in *)&data->gd_addr;
290         exp_readlock();
291
292         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
293
294         clp = auth_unix_lookup(&in6);
295         if (!clp)
296                 err = -EPERM;
297         else {
298                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
299                 auth_domain_put(clp);
300         }
301         exp_readunlock();
302
303         if (err == 0) {
304                 memset(res,0, NFS_FHSIZE);
305                 memcpy(res, &fh.fh_base, fh.fh_size);
306                 err = NFS_FHSIZE;
307         }
308  out:
309         return err;
310 }
311
312 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size)
313 {
314         struct sockaddr_in sin = {
315                 .sin_family     = AF_INET,
316         };
317         int b1, b2, b3, b4;
318         char c;
319         char *fo_path;
320
321         /* sanity check */
322         if (size == 0)
323                 return -EINVAL;
324
325         if (buf[size-1] != '\n')
326                 return -EINVAL;
327
328         fo_path = buf;
329         if (qword_get(&buf, fo_path, size) < 0)
330                 return -EINVAL;
331
332         /* get ipv4 address */
333         if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
334                 return -EINVAL;
335         if (b1 > 255 || b2 > 255 || b3 > 255 || b4 > 255)
336                 return -EINVAL;
337         sin.sin_addr.s_addr = htonl((b1 << 24) | (b2 << 16) | (b3 << 8) | b4);
338
339         return nlmsvc_unlock_all_by_ip((struct sockaddr *)&sin);
340 }
341
342 static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size)
343 {
344         struct path path;
345         char *fo_path;
346         int error;
347
348         /* sanity check */
349         if (size == 0)
350                 return -EINVAL;
351
352         if (buf[size-1] != '\n')
353                 return -EINVAL;
354
355         fo_path = buf;
356         if (qword_get(&buf, fo_path, size) < 0)
357                 return -EINVAL;
358
359         error = kern_path(fo_path, 0, &path);
360         if (error)
361                 return error;
362
363         error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
364
365         path_put(&path);
366         return error;
367 }
368
369 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
370 {
371         /* request is:
372          *   domain path maxsize
373          * response is
374          *   filehandle
375          *
376          * qword quoting is used, so filehandle will be \x....
377          */
378         char *dname, *path;
379         int uninitialized_var(maxsize);
380         char *mesg = buf;
381         int len;
382         struct auth_domain *dom;
383         struct knfsd_fh fh;
384
385         if (size == 0)
386                 return -EINVAL;
387
388         if (buf[size-1] != '\n')
389                 return -EINVAL;
390         buf[size-1] = 0;
391
392         dname = mesg;
393         len = qword_get(&mesg, dname, size);
394         if (len <= 0) return -EINVAL;
395         
396         path = dname+len+1;
397         len = qword_get(&mesg, path, size);
398         if (len <= 0) return -EINVAL;
399
400         len = get_int(&mesg, &maxsize);
401         if (len)
402                 return len;
403
404         if (maxsize < NFS_FHSIZE)
405                 return -EINVAL;
406         if (maxsize > NFS3_FHSIZE)
407                 maxsize = NFS3_FHSIZE;
408
409         if (qword_get(&mesg, mesg, size)>0)
410                 return -EINVAL;
411
412         /* we have all the words, they are in buf.. */
413         dom = unix_domain_find(dname);
414         if (!dom)
415                 return -ENOMEM;
416
417         len = exp_rootfh(dom, path, &fh,  maxsize);
418         auth_domain_put(dom);
419         if (len)
420                 return len;
421         
422         mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
423         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
424         mesg[-1] = '\n';
425         return mesg - buf;      
426 }
427
428 static ssize_t write_threads(struct file *file, char *buf, size_t size)
429 {
430         /* if size > 0, look for a number of threads and call nfsd_svc
431          * then write out number of threads as reply
432          */
433         char *mesg = buf;
434         int rv;
435         if (size > 0) {
436                 int newthreads;
437                 rv = get_int(&mesg, &newthreads);
438                 if (rv)
439                         return rv;
440                 if (newthreads <0)
441                         return -EINVAL;
442                 rv = nfsd_svc(2049, newthreads);
443                 if (rv)
444                         return rv;
445         }
446         sprintf(buf, "%d\n", nfsd_nrthreads());
447         return strlen(buf);
448 }
449
450 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
451 {
452         /* if size > 0, look for an array of number of threads per node
453          * and apply them  then write out number of threads per node as reply
454          */
455         char *mesg = buf;
456         int i;
457         int rv;
458         int len;
459         int npools;
460         int *nthreads;
461
462         mutex_lock(&nfsd_mutex);
463         npools = nfsd_nrpools();
464         if (npools == 0) {
465                 /*
466                  * NFS is shut down.  The admin can start it by
467                  * writing to the threads file but NOT the pool_threads
468                  * file, sorry.  Report zero threads.
469                  */
470                 mutex_unlock(&nfsd_mutex);
471                 strcpy(buf, "0\n");
472                 return strlen(buf);
473         }
474
475         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
476         rv = -ENOMEM;
477         if (nthreads == NULL)
478                 goto out_free;
479
480         if (size > 0) {
481                 for (i = 0; i < npools; i++) {
482                         rv = get_int(&mesg, &nthreads[i]);
483                         if (rv == -ENOENT)
484                                 break;          /* fewer numbers than pools */
485                         if (rv)
486                                 goto out_free;  /* syntax error */
487                         rv = -EINVAL;
488                         if (nthreads[i] < 0)
489                                 goto out_free;
490                 }
491                 rv = nfsd_set_nrthreads(i, nthreads);
492                 if (rv)
493                         goto out_free;
494         }
495
496         rv = nfsd_get_nrthreads(npools, nthreads);
497         if (rv)
498                 goto out_free;
499
500         mesg = buf;
501         size = SIMPLE_TRANSACTION_LIMIT;
502         for (i = 0; i < npools && size > 0; i++) {
503                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
504                 len = strlen(mesg);
505                 size -= len;
506                 mesg += len;
507         }
508
509         mutex_unlock(&nfsd_mutex);
510         return (mesg-buf);
511
512 out_free:
513         kfree(nthreads);
514         mutex_unlock(&nfsd_mutex);
515         return rv;
516 }
517
518 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
519 {
520         /*
521          * Format:
522          *   [-/+]vers [-/+]vers ...
523          */
524         char *mesg = buf;
525         char *vers, sign;
526         int len, num;
527         ssize_t tlen = 0;
528         char *sep;
529
530         if (size>0) {
531                 if (nfsd_serv)
532                         /* Cannot change versions without updating
533                          * nfsd_serv->sv_xdrsize, and reallocing
534                          * rq_argp and rq_resp
535                          */
536                         return -EBUSY;
537                 if (buf[size-1] != '\n')
538                         return -EINVAL;
539                 buf[size-1] = 0;
540
541                 vers = mesg;
542                 len = qword_get(&mesg, vers, size);
543                 if (len <= 0) return -EINVAL;
544                 do {
545                         sign = *vers;
546                         if (sign == '+' || sign == '-')
547                                 num = simple_strtol((vers+1), NULL, 0);
548                         else
549                                 num = simple_strtol(vers, NULL, 0);
550                         switch(num) {
551                         case 2:
552                         case 3:
553                         case 4:
554                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
555                                 break;
556                         default:
557                                 return -EINVAL;
558                         }
559                         vers += len + 1;
560                         tlen += len;
561                 } while ((len = qword_get(&mesg, vers, size)) > 0);
562                 /* If all get turned off, turn them back on, as
563                  * having no versions is BAD
564                  */
565                 nfsd_reset_versions();
566         }
567         /* Now write current state into reply buffer */
568         len = 0;
569         sep = "";
570         for (num=2 ; num <= 4 ; num++)
571                 if (nfsd_vers(num, NFSD_AVAIL)) {
572                         len += sprintf(buf+len, "%s%c%d", sep,
573                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
574                                        num);
575                         sep = " ";
576                 }
577         len += sprintf(buf+len, "\n");
578         return len;
579 }
580
581 static ssize_t write_versions(struct file *file, char *buf, size_t size)
582 {
583         ssize_t rv;
584
585         mutex_lock(&nfsd_mutex);
586         rv = __write_versions(file, buf, size);
587         mutex_unlock(&nfsd_mutex);
588         return rv;
589 }
590
591 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
592 {
593         if (size == 0) {
594                 int len = 0;
595
596                 if (nfsd_serv)
597                         len = svc_xprt_names(nfsd_serv, buf, 0);
598                 return len;
599         }
600         /* Either a single 'fd' number is written, in which
601          * case it must be for a socket of a supported family/protocol,
602          * and we use it as an nfsd socket, or
603          * A '-' followed by the 'name' of a socket in which case
604          * we close the socket.
605          */
606         if (isdigit(buf[0])) {
607                 char *mesg = buf;
608                 int fd;
609                 int err;
610                 err = get_int(&mesg, &fd);
611                 if (err)
612                         return -EINVAL;
613                 if (fd < 0)
614                         return -EINVAL;
615                 err = nfsd_create_serv();
616                 if (!err) {
617                         err = svc_addsock(nfsd_serv, fd, buf);
618                         if (err >= 0) {
619                                 err = lockd_up();
620                                 if (err < 0)
621                                         svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
622                         }
623                         /* Decrease the count, but don't shutdown the
624                          * the service
625                          */
626                         nfsd_serv->sv_nrthreads--;
627                 }
628                 return err < 0 ? err : 0;
629         }
630         if (buf[0] == '-' && isdigit(buf[1])) {
631                 char *toclose = kstrdup(buf+1, GFP_KERNEL);
632                 int len = 0;
633                 if (!toclose)
634                         return -ENOMEM;
635                 if (nfsd_serv)
636                         len = svc_sock_names(buf, nfsd_serv, toclose);
637                 if (len >= 0)
638                         lockd_down();
639                 kfree(toclose);
640                 return len;
641         }
642         /*
643          * Add a transport listener by writing it's transport name
644          */
645         if (isalpha(buf[0])) {
646                 int err;
647                 char transport[16];
648                 int port;
649                 if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
650                         err = nfsd_create_serv();
651                         if (!err) {
652                                 err = svc_create_xprt(nfsd_serv,
653                                                       transport, port,
654                                                       SVC_SOCK_ANONYMOUS);
655                                 if (err == -ENOENT)
656                                         /* Give a reasonable perror msg for
657                                          * bad transport string */
658                                         err = -EPROTONOSUPPORT;
659                         }
660                         return err < 0 ? err : 0;
661                 }
662         }
663         /*
664          * Remove a transport by writing it's transport name and port number
665          */
666         if (buf[0] == '-' && isalpha(buf[1])) {
667                 struct svc_xprt *xprt;
668                 int err = -EINVAL;
669                 char transport[16];
670                 int port;
671                 if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
672                         if (port == 0)
673                                 return -EINVAL;
674                         if (nfsd_serv) {
675                                 xprt = svc_find_xprt(nfsd_serv, transport,
676                                                      AF_UNSPEC, port);
677                                 if (xprt) {
678                                         svc_close_xprt(xprt);
679                                         svc_xprt_put(xprt);
680                                         err = 0;
681                                 } else
682                                         err = -ENOTCONN;
683                         }
684                         return err < 0 ? err : 0;
685                 }
686         }
687         return -EINVAL;
688 }
689
690 static ssize_t write_ports(struct file *file, char *buf, size_t size)
691 {
692         ssize_t rv;
693
694         mutex_lock(&nfsd_mutex);
695         rv = __write_ports(file, buf, size);
696         mutex_unlock(&nfsd_mutex);
697         return rv;
698 }
699
700
701 int nfsd_max_blksize;
702
703 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
704 {
705         char *mesg = buf;
706         if (size > 0) {
707                 int bsize;
708                 int rv = get_int(&mesg, &bsize);
709                 if (rv)
710                         return rv;
711                 /* force bsize into allowed range and
712                  * required alignment.
713                  */
714                 if (bsize < 1024)
715                         bsize = 1024;
716                 if (bsize > NFSSVC_MAXBLKSIZE)
717                         bsize = NFSSVC_MAXBLKSIZE;
718                 bsize &= ~(1024-1);
719                 mutex_lock(&nfsd_mutex);
720                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
721                         mutex_unlock(&nfsd_mutex);
722                         return -EBUSY;
723                 }
724                 nfsd_max_blksize = bsize;
725                 mutex_unlock(&nfsd_mutex);
726         }
727         return sprintf(buf, "%d\n", nfsd_max_blksize);
728 }
729
730 #ifdef CONFIG_NFSD_V4
731 extern time_t nfs4_leasetime(void);
732
733 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
734 {
735         /* if size > 10 seconds, call
736          * nfs4_reset_lease() then write out the new lease (seconds) as reply
737          */
738         char *mesg = buf;
739         int rv, lease;
740
741         if (size > 0) {
742                 if (nfsd_serv)
743                         return -EBUSY;
744                 rv = get_int(&mesg, &lease);
745                 if (rv)
746                         return rv;
747                 if (lease < 10 || lease > 3600)
748                         return -EINVAL;
749                 nfs4_reset_lease(lease);
750         }
751         sprintf(buf, "%ld\n", nfs4_lease_time());
752         return strlen(buf);
753 }
754
755 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
756 {
757         ssize_t rv;
758
759         mutex_lock(&nfsd_mutex);
760         rv = __write_leasetime(file, buf, size);
761         mutex_unlock(&nfsd_mutex);
762         return rv;
763 }
764
765 extern char *nfs4_recoverydir(void);
766
767 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
768 {
769         char *mesg = buf;
770         char *recdir;
771         int len, status;
772
773         if (size > 0) {
774                 if (nfsd_serv)
775                         return -EBUSY;
776                 if (size > PATH_MAX || buf[size-1] != '\n')
777                         return -EINVAL;
778                 buf[size-1] = 0;
779
780                 recdir = mesg;
781                 len = qword_get(&mesg, recdir, size);
782                 if (len <= 0)
783                         return -EINVAL;
784
785                 status = nfs4_reset_recoverydir(recdir);
786         }
787         sprintf(buf, "%s\n", nfs4_recoverydir());
788         return strlen(buf);
789 }
790
791 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
792 {
793         ssize_t rv;
794
795         mutex_lock(&nfsd_mutex);
796         rv = __write_recoverydir(file, buf, size);
797         mutex_unlock(&nfsd_mutex);
798         return rv;
799 }
800
801 #endif
802
803 /*----------------------------------------------------------------------------*/
804 /*
805  *      populating the filesystem.
806  */
807
808 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
809 {
810         static struct tree_descr nfsd_files[] = {
811                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
812                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
813                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
814                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
815                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
816                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
817                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
818                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
819                 [NFSD_FO_UnlockIP] = {"unlock_ip",
820                                         &transaction_ops, S_IWUSR|S_IRUSR},
821                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
822                                         &transaction_ops, S_IWUSR|S_IRUSR},
823                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
824                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
825                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
826                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
827                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
828                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
829 #ifdef CONFIG_NFSD_V4
830                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
831                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
832 #endif
833                 /* last one */ {""}
834         };
835         return simple_fill_super(sb, 0x6e667364, nfsd_files);
836 }
837
838 static int nfsd_get_sb(struct file_system_type *fs_type,
839         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
840 {
841         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
842 }
843
844 static struct file_system_type nfsd_fs_type = {
845         .owner          = THIS_MODULE,
846         .name           = "nfsd",
847         .get_sb         = nfsd_get_sb,
848         .kill_sb        = kill_litter_super,
849 };
850
851 #ifdef CONFIG_PROC_FS
852 static int create_proc_exports_entry(void)
853 {
854         struct proc_dir_entry *entry;
855
856         entry = proc_mkdir("fs/nfs", NULL);
857         if (!entry)
858                 return -ENOMEM;
859         entry = proc_create("exports", 0, entry, &exports_operations);
860         if (!entry)
861                 return -ENOMEM;
862         return 0;
863 }
864 #else /* CONFIG_PROC_FS */
865 static int create_proc_exports_entry(void)
866 {
867         return 0;
868 }
869 #endif
870
871 static int __init init_nfsd(void)
872 {
873         int retval;
874         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
875
876         retval = nfs4_state_init(); /* nfs4 locking state */
877         if (retval)
878                 return retval;
879         nfsd_stat_init();       /* Statistics */
880         retval = nfsd_reply_cache_init();
881         if (retval)
882                 goto out_free_stat;
883         retval = nfsd_export_init();
884         if (retval)
885                 goto out_free_cache;
886         nfsd_lockd_init();      /* lockd->nfsd callbacks */
887         retval = nfsd_idmap_init();
888         if (retval)
889                 goto out_free_lockd;
890         retval = create_proc_exports_entry();
891         if (retval)
892                 goto out_free_idmap;
893         retval = register_filesystem(&nfsd_fs_type);
894         if (retval)
895                 goto out_free_all;
896         return 0;
897 out_free_all:
898         remove_proc_entry("fs/nfs/exports", NULL);
899         remove_proc_entry("fs/nfs", NULL);
900 out_free_idmap:
901         nfsd_idmap_shutdown();
902 out_free_lockd:
903         nfsd_lockd_shutdown();
904         nfsd_export_shutdown();
905 out_free_cache:
906         nfsd_reply_cache_shutdown();
907 out_free_stat:
908         nfsd_stat_shutdown();
909         nfsd4_free_slabs();
910         return retval;
911 }
912
913 static void __exit exit_nfsd(void)
914 {
915         nfsd_export_shutdown();
916         nfsd_reply_cache_shutdown();
917         remove_proc_entry("fs/nfs/exports", NULL);
918         remove_proc_entry("fs/nfs", NULL);
919         nfsd_stat_shutdown();
920         nfsd_lockd_shutdown();
921         nfsd_idmap_shutdown();
922         nfsd4_free_slabs();
923         unregister_filesystem(&nfsd_fs_type);
924 }
925
926 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
927 MODULE_LICENSE("GPL");
928 module_init(init_nfsd)
929 module_exit(exit_nfsd)