Merge git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq
[linux-2.6] / fs / nfsd / nfsctl.c
1 /*
2  * linux/fs/nfsd/nfsctl.c
3  *
4  * Syscall interface to knfsd.
5  *
6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7  */
8
9 #include <linux/module.h>
10
11 #include <linux/linkage.h>
12 #include <linux/time.h>
13 #include <linux/errno.h>
14 #include <linux/fs.h>
15 #include <linux/fcntl.h>
16 #include <linux/net.h>
17 #include <linux/in.h>
18 #include <linux/syscalls.h>
19 #include <linux/unistd.h>
20 #include <linux/slab.h>
21 #include <linux/proc_fs.h>
22 #include <linux/seq_file.h>
23 #include <linux/pagemap.h>
24 #include <linux/init.h>
25 #include <linux/inet.h>
26 #include <linux/string.h>
27 #include <linux/smp_lock.h>
28 #include <linux/ctype.h>
29
30 #include <linux/nfs.h>
31 #include <linux/nfsd_idmap.h>
32 #include <linux/lockd/bind.h>
33 #include <linux/sunrpc/svc.h>
34 #include <linux/sunrpc/svcsock.h>
35 #include <linux/nfsd/nfsd.h>
36 #include <linux/nfsd/cache.h>
37 #include <linux/nfsd/xdr.h>
38 #include <linux/nfsd/syscall.h>
39 #include <linux/lockd/lockd.h>
40
41 #include <asm/uaccess.h>
42 #include <net/ipv6.h>
43
44 /*
45  *      We have a single directory with 9 nodes in it.
46  */
47 enum {
48         NFSD_Root = 1,
49         NFSD_Svc,
50         NFSD_Add,
51         NFSD_Del,
52         NFSD_Export,
53         NFSD_Unexport,
54         NFSD_Getfd,
55         NFSD_Getfs,
56         NFSD_List,
57         NFSD_Fh,
58         NFSD_FO_UnlockIP,
59         NFSD_FO_UnlockFS,
60         NFSD_Threads,
61         NFSD_Pool_Threads,
62         NFSD_Versions,
63         NFSD_Ports,
64         NFSD_MaxBlkSize,
65         /*
66          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
67          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
68          */
69 #ifdef CONFIG_NFSD_V4
70         NFSD_Leasetime,
71         NFSD_RecoveryDir,
72 #endif
73 };
74
75 /*
76  * write() for these nodes.
77  */
78 static ssize_t write_svc(struct file *file, char *buf, size_t size);
79 static ssize_t write_add(struct file *file, char *buf, size_t size);
80 static ssize_t write_del(struct file *file, char *buf, size_t size);
81 static ssize_t write_export(struct file *file, char *buf, size_t size);
82 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
83 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
84 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
85 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
86 static ssize_t write_threads(struct file *file, char *buf, size_t size);
87 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
88 static ssize_t write_versions(struct file *file, char *buf, size_t size);
89 static ssize_t write_ports(struct file *file, char *buf, size_t size);
90 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
91 #ifdef CONFIG_NFSD_V4
92 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
93 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
94 #endif
95
96 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size);
97 static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size);
98
99 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
100         [NFSD_Svc] = write_svc,
101         [NFSD_Add] = write_add,
102         [NFSD_Del] = write_del,
103         [NFSD_Export] = write_export,
104         [NFSD_Unexport] = write_unexport,
105         [NFSD_Getfd] = write_getfd,
106         [NFSD_Getfs] = write_getfs,
107         [NFSD_Fh] = write_filehandle,
108         [NFSD_FO_UnlockIP] = failover_unlock_ip,
109         [NFSD_FO_UnlockFS] = failover_unlock_fs,
110         [NFSD_Threads] = write_threads,
111         [NFSD_Pool_Threads] = write_pool_threads,
112         [NFSD_Versions] = write_versions,
113         [NFSD_Ports] = write_ports,
114         [NFSD_MaxBlkSize] = write_maxblksize,
115 #ifdef CONFIG_NFSD_V4
116         [NFSD_Leasetime] = write_leasetime,
117         [NFSD_RecoveryDir] = write_recoverydir,
118 #endif
119 };
120
121 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
122 {
123         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
124         char *data;
125         ssize_t rv;
126
127         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
128                 return -EINVAL;
129
130         data = simple_transaction_get(file, buf, size);
131         if (IS_ERR(data))
132                 return PTR_ERR(data);
133
134         rv =  write_op[ino](file, data, size);
135         if (rv >= 0) {
136                 simple_transaction_set(file, rv);
137                 rv = size;
138         }
139         return rv;
140 }
141
142 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
143 {
144         if (! file->private_data) {
145                 /* An attempt to read a transaction file without writing
146                  * causes a 0-byte write so that the file can return
147                  * state information
148                  */
149                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
150                 if (rv < 0)
151                         return rv;
152         }
153         return simple_transaction_read(file, buf, size, pos);
154 }
155
156 static const struct file_operations transaction_ops = {
157         .write          = nfsctl_transaction_write,
158         .read           = nfsctl_transaction_read,
159         .release        = simple_transaction_release,
160 };
161
162 static int exports_open(struct inode *inode, struct file *file)
163 {
164         return seq_open(file, &nfs_exports_op);
165 }
166
167 static const struct file_operations exports_operations = {
168         .open           = exports_open,
169         .read           = seq_read,
170         .llseek         = seq_lseek,
171         .release        = seq_release,
172         .owner          = THIS_MODULE,
173 };
174
175 /*----------------------------------------------------------------------------*/
176 /*
177  * payload - write methods
178  * If the method has a response, the response should be put in buf,
179  * and the length returned.  Otherwise return 0 or and -error.
180  */
181
182 static ssize_t write_svc(struct file *file, char *buf, size_t size)
183 {
184         struct nfsctl_svc *data;
185         if (size < sizeof(*data))
186                 return -EINVAL;
187         data = (struct nfsctl_svc*) buf;
188         return nfsd_svc(data->svc_port, data->svc_nthreads);
189 }
190
191 static ssize_t write_add(struct file *file, char *buf, size_t size)
192 {
193         struct nfsctl_client *data;
194         if (size < sizeof(*data))
195                 return -EINVAL;
196         data = (struct nfsctl_client *)buf;
197         return exp_addclient(data);
198 }
199
200 static ssize_t write_del(struct file *file, char *buf, size_t size)
201 {
202         struct nfsctl_client *data;
203         if (size < sizeof(*data))
204                 return -EINVAL;
205         data = (struct nfsctl_client *)buf;
206         return exp_delclient(data);
207 }
208
209 static ssize_t write_export(struct file *file, char *buf, size_t size)
210 {
211         struct nfsctl_export *data;
212         if (size < sizeof(*data))
213                 return -EINVAL;
214         data = (struct nfsctl_export*)buf;
215         return exp_export(data);
216 }
217
218 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
219 {
220         struct nfsctl_export *data;
221
222         if (size < sizeof(*data))
223                 return -EINVAL;
224         data = (struct nfsctl_export*)buf;
225         return exp_unexport(data);
226 }
227
228 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
229 {
230         struct nfsctl_fsparm *data;
231         struct sockaddr_in *sin;
232         struct auth_domain *clp;
233         int err = 0;
234         struct knfsd_fh *res;
235         struct in6_addr in6;
236
237         if (size < sizeof(*data))
238                 return -EINVAL;
239         data = (struct nfsctl_fsparm*)buf;
240         err = -EPROTONOSUPPORT;
241         if (data->gd_addr.sa_family != AF_INET)
242                 goto out;
243         sin = (struct sockaddr_in *)&data->gd_addr;
244         if (data->gd_maxlen > NFS3_FHSIZE)
245                 data->gd_maxlen = NFS3_FHSIZE;
246
247         res = (struct knfsd_fh*)buf;
248
249         exp_readlock();
250
251         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
252
253         clp = auth_unix_lookup(&in6);
254         if (!clp)
255                 err = -EPERM;
256         else {
257                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
258                 auth_domain_put(clp);
259         }
260         exp_readunlock();
261         if (err == 0)
262                 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
263  out:
264         return err;
265 }
266
267 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
268 {
269         struct nfsctl_fdparm *data;
270         struct sockaddr_in *sin;
271         struct auth_domain *clp;
272         int err = 0;
273         struct knfsd_fh fh;
274         char *res;
275         struct in6_addr in6;
276
277         if (size < sizeof(*data))
278                 return -EINVAL;
279         data = (struct nfsctl_fdparm*)buf;
280         err = -EPROTONOSUPPORT;
281         if (data->gd_addr.sa_family != AF_INET)
282                 goto out;
283         err = -EINVAL;
284         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
285                 goto out;
286
287         res = buf;
288         sin = (struct sockaddr_in *)&data->gd_addr;
289         exp_readlock();
290
291         ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
292
293         clp = auth_unix_lookup(&in6);
294         if (!clp)
295                 err = -EPERM;
296         else {
297                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
298                 auth_domain_put(clp);
299         }
300         exp_readunlock();
301
302         if (err == 0) {
303                 memset(res,0, NFS_FHSIZE);
304                 memcpy(res, &fh.fh_base, fh.fh_size);
305                 err = NFS_FHSIZE;
306         }
307  out:
308         return err;
309 }
310
311 static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size)
312 {
313         __be32 server_ip;
314         char *fo_path, c;
315         int b1, b2, b3, b4;
316
317         /* sanity check */
318         if (size == 0)
319                 return -EINVAL;
320
321         if (buf[size-1] != '\n')
322                 return -EINVAL;
323
324         fo_path = buf;
325         if (qword_get(&buf, fo_path, size) < 0)
326                 return -EINVAL;
327
328         /* get ipv4 address */
329         if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
330                 return -EINVAL;
331         server_ip = htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
332
333         return nlmsvc_unlock_all_by_ip(server_ip);
334 }
335
336 static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size)
337 {
338         struct nameidata nd;
339         char *fo_path;
340         int error;
341
342         /* sanity check */
343         if (size == 0)
344                 return -EINVAL;
345
346         if (buf[size-1] != '\n')
347                 return -EINVAL;
348
349         fo_path = buf;
350         if (qword_get(&buf, fo_path, size) < 0)
351                 return -EINVAL;
352
353         error = path_lookup(fo_path, 0, &nd);
354         if (error)
355                 return error;
356
357         error = nlmsvc_unlock_all_by_sb(nd.path.mnt->mnt_sb);
358
359         path_put(&nd.path);
360         return error;
361 }
362
363 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
364 {
365         /* request is:
366          *   domain path maxsize
367          * response is
368          *   filehandle
369          *
370          * qword quoting is used, so filehandle will be \x....
371          */
372         char *dname, *path;
373         int uninitialized_var(maxsize);
374         char *mesg = buf;
375         int len;
376         struct auth_domain *dom;
377         struct knfsd_fh fh;
378
379         if (size == 0)
380                 return -EINVAL;
381
382         if (buf[size-1] != '\n')
383                 return -EINVAL;
384         buf[size-1] = 0;
385
386         dname = mesg;
387         len = qword_get(&mesg, dname, size);
388         if (len <= 0) return -EINVAL;
389         
390         path = dname+len+1;
391         len = qword_get(&mesg, path, size);
392         if (len <= 0) return -EINVAL;
393
394         len = get_int(&mesg, &maxsize);
395         if (len)
396                 return len;
397
398         if (maxsize < NFS_FHSIZE)
399                 return -EINVAL;
400         if (maxsize > NFS3_FHSIZE)
401                 maxsize = NFS3_FHSIZE;
402
403         if (qword_get(&mesg, mesg, size)>0)
404                 return -EINVAL;
405
406         /* we have all the words, they are in buf.. */
407         dom = unix_domain_find(dname);
408         if (!dom)
409                 return -ENOMEM;
410
411         len = exp_rootfh(dom, path, &fh,  maxsize);
412         auth_domain_put(dom);
413         if (len)
414                 return len;
415         
416         mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
417         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
418         mesg[-1] = '\n';
419         return mesg - buf;      
420 }
421
422 static ssize_t write_threads(struct file *file, char *buf, size_t size)
423 {
424         /* if size > 0, look for a number of threads and call nfsd_svc
425          * then write out number of threads as reply
426          */
427         char *mesg = buf;
428         int rv;
429         if (size > 0) {
430                 int newthreads;
431                 rv = get_int(&mesg, &newthreads);
432                 if (rv)
433                         return rv;
434                 if (newthreads <0)
435                         return -EINVAL;
436                 rv = nfsd_svc(2049, newthreads);
437                 if (rv)
438                         return rv;
439         }
440         sprintf(buf, "%d\n", nfsd_nrthreads());
441         return strlen(buf);
442 }
443
444 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
445 {
446         /* if size > 0, look for an array of number of threads per node
447          * and apply them  then write out number of threads per node as reply
448          */
449         char *mesg = buf;
450         int i;
451         int rv;
452         int len;
453         int npools = nfsd_nrpools();
454         int *nthreads;
455
456         if (npools == 0) {
457                 /*
458                  * NFS is shut down.  The admin can start it by
459                  * writing to the threads file but NOT the pool_threads
460                  * file, sorry.  Report zero threads.
461                  */
462                 strcpy(buf, "0\n");
463                 return strlen(buf);
464         }
465
466         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
467         if (nthreads == NULL)
468                 return -ENOMEM;
469
470         if (size > 0) {
471                 for (i = 0; i < npools; i++) {
472                         rv = get_int(&mesg, &nthreads[i]);
473                         if (rv == -ENOENT)
474                                 break;          /* fewer numbers than pools */
475                         if (rv)
476                                 goto out_free;  /* syntax error */
477                         rv = -EINVAL;
478                         if (nthreads[i] < 0)
479                                 goto out_free;
480                 }
481                 rv = nfsd_set_nrthreads(i, nthreads);
482                 if (rv)
483                         goto out_free;
484         }
485
486         rv = nfsd_get_nrthreads(npools, nthreads);
487         if (rv)
488                 goto out_free;
489
490         mesg = buf;
491         size = SIMPLE_TRANSACTION_LIMIT;
492         for (i = 0; i < npools && size > 0; i++) {
493                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
494                 len = strlen(mesg);
495                 size -= len;
496                 mesg += len;
497         }
498
499         return (mesg-buf);
500
501 out_free:
502         kfree(nthreads);
503         return rv;
504 }
505
506 static ssize_t write_versions(struct file *file, char *buf, size_t size)
507 {
508         /*
509          * Format:
510          *   [-/+]vers [-/+]vers ...
511          */
512         char *mesg = buf;
513         char *vers, sign;
514         int len, num;
515         ssize_t tlen = 0;
516         char *sep;
517
518         if (size>0) {
519                 if (nfsd_serv)
520                         /* Cannot change versions without updating
521                          * nfsd_serv->sv_xdrsize, and reallocing
522                          * rq_argp and rq_resp
523                          */
524                         return -EBUSY;
525                 if (buf[size-1] != '\n')
526                         return -EINVAL;
527                 buf[size-1] = 0;
528
529                 vers = mesg;
530                 len = qword_get(&mesg, vers, size);
531                 if (len <= 0) return -EINVAL;
532                 do {
533                         sign = *vers;
534                         if (sign == '+' || sign == '-')
535                                 num = simple_strtol((vers+1), NULL, 0);
536                         else
537                                 num = simple_strtol(vers, NULL, 0);
538                         switch(num) {
539                         case 2:
540                         case 3:
541                         case 4:
542                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
543                                 break;
544                         default:
545                                 return -EINVAL;
546                         }
547                         vers += len + 1;
548                         tlen += len;
549                 } while ((len = qword_get(&mesg, vers, size)) > 0);
550                 /* If all get turned off, turn them back on, as
551                  * having no versions is BAD
552                  */
553                 nfsd_reset_versions();
554         }
555         /* Now write current state into reply buffer */
556         len = 0;
557         sep = "";
558         for (num=2 ; num <= 4 ; num++)
559                 if (nfsd_vers(num, NFSD_AVAIL)) {
560                         len += sprintf(buf+len, "%s%c%d", sep,
561                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
562                                        num);
563                         sep = " ";
564                 }
565         len += sprintf(buf+len, "\n");
566         return len;
567 }
568
569 static ssize_t write_ports(struct file *file, char *buf, size_t size)
570 {
571         if (size == 0) {
572                 int len = 0;
573                 lock_kernel();
574                 if (nfsd_serv)
575                         len = svc_xprt_names(nfsd_serv, buf, 0);
576                 unlock_kernel();
577                 return len;
578         }
579         /* Either a single 'fd' number is written, in which
580          * case it must be for a socket of a supported family/protocol,
581          * and we use it as an nfsd socket, or
582          * A '-' followed by the 'name' of a socket in which case
583          * we close the socket.
584          */
585         if (isdigit(buf[0])) {
586                 char *mesg = buf;
587                 int fd;
588                 int err;
589                 err = get_int(&mesg, &fd);
590                 if (err)
591                         return -EINVAL;
592                 if (fd < 0)
593                         return -EINVAL;
594                 err = nfsd_create_serv();
595                 if (!err) {
596                         int proto = 0;
597                         err = svc_addsock(nfsd_serv, fd, buf, &proto);
598                         if (err >= 0) {
599                                 err = lockd_up(proto);
600                                 if (err < 0)
601                                         svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
602                         }
603                         /* Decrease the count, but don't shutdown the
604                          * the service
605                          */
606                         lock_kernel();
607                         nfsd_serv->sv_nrthreads--;
608                         unlock_kernel();
609                 }
610                 return err < 0 ? err : 0;
611         }
612         if (buf[0] == '-' && isdigit(buf[1])) {
613                 char *toclose = kstrdup(buf+1, GFP_KERNEL);
614                 int len = 0;
615                 if (!toclose)
616                         return -ENOMEM;
617                 lock_kernel();
618                 if (nfsd_serv)
619                         len = svc_sock_names(buf, nfsd_serv, toclose);
620                 unlock_kernel();
621                 if (len >= 0)
622                         lockd_down();
623                 kfree(toclose);
624                 return len;
625         }
626         /*
627          * Add a transport listener by writing it's transport name
628          */
629         if (isalpha(buf[0])) {
630                 int err;
631                 char transport[16];
632                 int port;
633                 if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
634                         err = nfsd_create_serv();
635                         if (!err) {
636                                 err = svc_create_xprt(nfsd_serv,
637                                                       transport, port,
638                                                       SVC_SOCK_ANONYMOUS);
639                                 if (err == -ENOENT)
640                                         /* Give a reasonable perror msg for
641                                          * bad transport string */
642                                         err = -EPROTONOSUPPORT;
643                         }
644                         return err < 0 ? err : 0;
645                 }
646         }
647         /*
648          * Remove a transport by writing it's transport name and port number
649          */
650         if (buf[0] == '-' && isalpha(buf[1])) {
651                 struct svc_xprt *xprt;
652                 int err = -EINVAL;
653                 char transport[16];
654                 int port;
655                 if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
656                         if (port == 0)
657                                 return -EINVAL;
658                         lock_kernel();
659                         if (nfsd_serv) {
660                                 xprt = svc_find_xprt(nfsd_serv, transport,
661                                                      AF_UNSPEC, port);
662                                 if (xprt) {
663                                         svc_close_xprt(xprt);
664                                         svc_xprt_put(xprt);
665                                         err = 0;
666                                 } else
667                                         err = -ENOTCONN;
668                         }
669                         unlock_kernel();
670                         return err < 0 ? err : 0;
671                 }
672         }
673         return -EINVAL;
674 }
675
676 int nfsd_max_blksize;
677
678 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
679 {
680         char *mesg = buf;
681         if (size > 0) {
682                 int bsize;
683                 int rv = get_int(&mesg, &bsize);
684                 if (rv)
685                         return rv;
686                 /* force bsize into allowed range and
687                  * required alignment.
688                  */
689                 if (bsize < 1024)
690                         bsize = 1024;
691                 if (bsize > NFSSVC_MAXBLKSIZE)
692                         bsize = NFSSVC_MAXBLKSIZE;
693                 bsize &= ~(1024-1);
694                 lock_kernel();
695                 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
696                         unlock_kernel();
697                         return -EBUSY;
698                 }
699                 nfsd_max_blksize = bsize;
700                 unlock_kernel();
701         }
702         return sprintf(buf, "%d\n", nfsd_max_blksize);
703 }
704
705 #ifdef CONFIG_NFSD_V4
706 extern time_t nfs4_leasetime(void);
707
708 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
709 {
710         /* if size > 10 seconds, call
711          * nfs4_reset_lease() then write out the new lease (seconds) as reply
712          */
713         char *mesg = buf;
714         int rv;
715
716         if (size > 0) {
717                 int lease;
718                 rv = get_int(&mesg, &lease);
719                 if (rv)
720                         return rv;
721                 if (lease < 10 || lease > 3600)
722                         return -EINVAL;
723                 nfs4_reset_lease(lease);
724         }
725         sprintf(buf, "%ld\n", nfs4_lease_time());
726         return strlen(buf);
727 }
728
729 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
730 {
731         char *mesg = buf;
732         char *recdir;
733         int len, status;
734
735         if (size == 0 || size > PATH_MAX || buf[size-1] != '\n')
736                 return -EINVAL;
737         buf[size-1] = 0;
738
739         recdir = mesg;
740         len = qword_get(&mesg, recdir, size);
741         if (len <= 0)
742                 return -EINVAL;
743
744         status = nfs4_reset_recoverydir(recdir);
745         return strlen(buf);
746 }
747 #endif
748
749 /*----------------------------------------------------------------------------*/
750 /*
751  *      populating the filesystem.
752  */
753
754 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
755 {
756         static struct tree_descr nfsd_files[] = {
757                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
758                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
759                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
760                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
761                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
762                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
763                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
764                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
765                 [NFSD_FO_UnlockIP] = {"unlock_ip",
766                                         &transaction_ops, S_IWUSR|S_IRUSR},
767                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
768                                         &transaction_ops, S_IWUSR|S_IRUSR},
769                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
770                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
771                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
772                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
773                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
774                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
775 #ifdef CONFIG_NFSD_V4
776                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
777                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
778 #endif
779                 /* last one */ {""}
780         };
781         return simple_fill_super(sb, 0x6e667364, nfsd_files);
782 }
783
784 static int nfsd_get_sb(struct file_system_type *fs_type,
785         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
786 {
787         return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
788 }
789
790 static struct file_system_type nfsd_fs_type = {
791         .owner          = THIS_MODULE,
792         .name           = "nfsd",
793         .get_sb         = nfsd_get_sb,
794         .kill_sb        = kill_litter_super,
795 };
796
797 #ifdef CONFIG_PROC_FS
798 static int create_proc_exports_entry(void)
799 {
800         struct proc_dir_entry *entry;
801
802         entry = proc_mkdir("fs/nfs", NULL);
803         if (!entry)
804                 return -ENOMEM;
805         entry = proc_create("exports", 0, entry, &exports_operations);
806         if (!entry)
807                 return -ENOMEM;
808         return 0;
809 }
810 #else /* CONFIG_PROC_FS */
811 static int create_proc_exports_entry(void)
812 {
813         return 0;
814 }
815 #endif
816
817 static int __init init_nfsd(void)
818 {
819         int retval;
820         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
821
822         retval = nfs4_state_init(); /* nfs4 locking state */
823         if (retval)
824                 return retval;
825         nfsd_stat_init();       /* Statistics */
826         retval = nfsd_reply_cache_init();
827         if (retval)
828                 goto out_free_stat;
829         retval = nfsd_export_init();
830         if (retval)
831                 goto out_free_cache;
832         nfsd_lockd_init();      /* lockd->nfsd callbacks */
833         retval = nfsd_idmap_init();
834         if (retval)
835                 goto out_free_lockd;
836         retval = create_proc_exports_entry();
837         if (retval)
838                 goto out_free_idmap;
839         retval = register_filesystem(&nfsd_fs_type);
840         if (retval)
841                 goto out_free_all;
842         return 0;
843 out_free_all:
844         remove_proc_entry("fs/nfs/exports", NULL);
845         remove_proc_entry("fs/nfs", NULL);
846 out_free_idmap:
847         nfsd_idmap_shutdown();
848 out_free_lockd:
849         nfsd_lockd_shutdown();
850         nfsd_export_shutdown();
851 out_free_cache:
852         nfsd_reply_cache_shutdown();
853 out_free_stat:
854         nfsd_stat_shutdown();
855         nfsd4_free_slabs();
856         return retval;
857 }
858
859 static void __exit exit_nfsd(void)
860 {
861         nfsd_export_shutdown();
862         nfsd_reply_cache_shutdown();
863         remove_proc_entry("fs/nfs/exports", NULL);
864         remove_proc_entry("fs/nfs", NULL);
865         nfsd_stat_shutdown();
866         nfsd_lockd_shutdown();
867         nfsd_idmap_shutdown();
868         nfsd4_free_slabs();
869         unregister_filesystem(&nfsd_fs_type);
870 }
871
872 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
873 MODULE_LICENSE("GPL");
874 module_init(init_nfsd)
875 module_exit(exit_nfsd)