Merge tag 'jfs-3.10' of git://github.com/kleikamp/linux-shaggy
[linux-3.10.git] / fs / nfsd / nfsctl.c
1 /*
2  * Syscall interface to knfsd.
3  *
4  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
5  */
6
7 #include <linux/slab.h>
8 #include <linux/namei.h>
9 #include <linux/ctype.h>
10
11 #include <linux/sunrpc/svcsock.h>
12 #include <linux/lockd/lockd.h>
13 #include <linux/sunrpc/addr.h>
14 #include <linux/sunrpc/gss_api.h>
15 #include <linux/sunrpc/gss_krb5_enctypes.h>
16 #include <linux/sunrpc/rpc_pipe_fs.h>
17 #include <linux/module.h>
18
19 #include "idmap.h"
20 #include "nfsd.h"
21 #include "cache.h"
22 #include "state.h"
23 #include "netns.h"
24
25 /*
26  *      We have a single directory with several nodes in it.
27  */
28 enum {
29         NFSD_Root = 1,
30         NFSD_List,
31         NFSD_Export_features,
32         NFSD_Fh,
33         NFSD_FO_UnlockIP,
34         NFSD_FO_UnlockFS,
35         NFSD_Threads,
36         NFSD_Pool_Threads,
37         NFSD_Pool_Stats,
38         NFSD_Versions,
39         NFSD_Ports,
40         NFSD_MaxBlkSize,
41         NFSD_SupportedEnctypes,
42         /*
43          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
44          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
45          */
46 #ifdef CONFIG_NFSD_V4
47         NFSD_Leasetime,
48         NFSD_Gracetime,
49         NFSD_RecoveryDir,
50 #endif
51 };
52
53 /*
54  * write() for these nodes.
55  */
56 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
57 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
58 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
59 static ssize_t write_threads(struct file *file, char *buf, size_t size);
60 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
61 static ssize_t write_versions(struct file *file, char *buf, size_t size);
62 static ssize_t write_ports(struct file *file, char *buf, size_t size);
63 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
64 #ifdef CONFIG_NFSD_V4
65 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
66 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
67 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
68 #endif
69
70 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
71         [NFSD_Fh] = write_filehandle,
72         [NFSD_FO_UnlockIP] = write_unlock_ip,
73         [NFSD_FO_UnlockFS] = write_unlock_fs,
74         [NFSD_Threads] = write_threads,
75         [NFSD_Pool_Threads] = write_pool_threads,
76         [NFSD_Versions] = write_versions,
77         [NFSD_Ports] = write_ports,
78         [NFSD_MaxBlkSize] = write_maxblksize,
79 #ifdef CONFIG_NFSD_V4
80         [NFSD_Leasetime] = write_leasetime,
81         [NFSD_Gracetime] = write_gracetime,
82         [NFSD_RecoveryDir] = write_recoverydir,
83 #endif
84 };
85
86 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
87 {
88         ino_t ino =  file_inode(file)->i_ino;
89         char *data;
90         ssize_t rv;
91
92         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
93                 return -EINVAL;
94
95         data = simple_transaction_get(file, buf, size);
96         if (IS_ERR(data))
97                 return PTR_ERR(data);
98
99         rv =  write_op[ino](file, data, size);
100         if (rv >= 0) {
101                 simple_transaction_set(file, rv);
102                 rv = size;
103         }
104         return rv;
105 }
106
107 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
108 {
109         if (! file->private_data) {
110                 /* An attempt to read a transaction file without writing
111                  * causes a 0-byte write so that the file can return
112                  * state information
113                  */
114                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
115                 if (rv < 0)
116                         return rv;
117         }
118         return simple_transaction_read(file, buf, size, pos);
119 }
120
121 static const struct file_operations transaction_ops = {
122         .write          = nfsctl_transaction_write,
123         .read           = nfsctl_transaction_read,
124         .release        = simple_transaction_release,
125         .llseek         = default_llseek,
126 };
127
128 static int exports_net_open(struct net *net, struct file *file)
129 {
130         int err;
131         struct seq_file *seq;
132         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
133
134         err = seq_open(file, &nfs_exports_op);
135         if (err)
136                 return err;
137
138         seq = file->private_data;
139         seq->private = nn->svc_export_cache;
140         return 0;
141 }
142
143 static int exports_proc_open(struct inode *inode, struct file *file)
144 {
145         return exports_net_open(current->nsproxy->net_ns, file);
146 }
147
148 static const struct file_operations exports_proc_operations = {
149         .open           = exports_proc_open,
150         .read           = seq_read,
151         .llseek         = seq_lseek,
152         .release        = seq_release,
153         .owner          = THIS_MODULE,
154 };
155
156 static int exports_nfsd_open(struct inode *inode, struct file *file)
157 {
158         return exports_net_open(inode->i_sb->s_fs_info, file);
159 }
160
161 static const struct file_operations exports_nfsd_operations = {
162         .open           = exports_nfsd_open,
163         .read           = seq_read,
164         .llseek         = seq_lseek,
165         .release        = seq_release,
166         .owner          = THIS_MODULE,
167 };
168
169 static int export_features_show(struct seq_file *m, void *v)
170 {
171         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
172         return 0;
173 }
174
175 static int export_features_open(struct inode *inode, struct file *file)
176 {
177         return single_open(file, export_features_show, NULL);
178 }
179
180 static const struct file_operations export_features_operations = {
181         .open           = export_features_open,
182         .read           = seq_read,
183         .llseek         = seq_lseek,
184         .release        = single_release,
185 };
186
187 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
188 static int supported_enctypes_show(struct seq_file *m, void *v)
189 {
190         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
191         return 0;
192 }
193
194 static int supported_enctypes_open(struct inode *inode, struct file *file)
195 {
196         return single_open(file, supported_enctypes_show, NULL);
197 }
198
199 static const struct file_operations supported_enctypes_ops = {
200         .open           = supported_enctypes_open,
201         .read           = seq_read,
202         .llseek         = seq_lseek,
203         .release        = single_release,
204 };
205 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
206
207 static const struct file_operations pool_stats_operations = {
208         .open           = nfsd_pool_stats_open,
209         .read           = seq_read,
210         .llseek         = seq_lseek,
211         .release        = nfsd_pool_stats_release,
212         .owner          = THIS_MODULE,
213 };
214
215 /*----------------------------------------------------------------------------*/
216 /*
217  * payload - write methods
218  */
219
220
221 /**
222  * write_unlock_ip - Release all locks used by a client
223  *
224  * Experimental.
225  *
226  * Input:
227  *                      buf:    '\n'-terminated C string containing a
228  *                              presentation format IP address
229  *                      size:   length of C string in @buf
230  * Output:
231  *      On success:     returns zero if all specified locks were released;
232  *                      returns one if one or more locks were not released
233  *      On error:       return code is negative errno value
234  */
235 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
236 {
237         struct sockaddr_storage address;
238         struct sockaddr *sap = (struct sockaddr *)&address;
239         size_t salen = sizeof(address);
240         char *fo_path;
241         struct net *net = file->f_dentry->d_sb->s_fs_info;
242
243         /* sanity check */
244         if (size == 0)
245                 return -EINVAL;
246
247         if (buf[size-1] != '\n')
248                 return -EINVAL;
249
250         fo_path = buf;
251         if (qword_get(&buf, fo_path, size) < 0)
252                 return -EINVAL;
253
254         if (rpc_pton(net, fo_path, size, sap, salen) == 0)
255                 return -EINVAL;
256
257         return nlmsvc_unlock_all_by_ip(sap);
258 }
259
260 /**
261  * write_unlock_fs - Release all locks on a local file system
262  *
263  * Experimental.
264  *
265  * Input:
266  *                      buf:    '\n'-terminated C string containing the
267  *                              absolute pathname of a local file system
268  *                      size:   length of C string in @buf
269  * Output:
270  *      On success:     returns zero if all specified locks were released;
271  *                      returns one if one or more locks were not released
272  *      On error:       return code is negative errno value
273  */
274 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
275 {
276         struct path path;
277         char *fo_path;
278         int error;
279
280         /* sanity check */
281         if (size == 0)
282                 return -EINVAL;
283
284         if (buf[size-1] != '\n')
285                 return -EINVAL;
286
287         fo_path = buf;
288         if (qword_get(&buf, fo_path, size) < 0)
289                 return -EINVAL;
290
291         error = kern_path(fo_path, 0, &path);
292         if (error)
293                 return error;
294
295         /*
296          * XXX: Needs better sanity checking.  Otherwise we could end up
297          * releasing locks on the wrong file system.
298          *
299          * For example:
300          * 1.  Does the path refer to a directory?
301          * 2.  Is that directory a mount point, or
302          * 3.  Is that directory the root of an exported file system?
303          */
304         error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
305
306         path_put(&path);
307         return error;
308 }
309
310 /**
311  * write_filehandle - Get a variable-length NFS file handle by path
312  *
313  * On input, the buffer contains a '\n'-terminated C string comprised of
314  * three alphanumeric words separated by whitespace.  The string may
315  * contain escape sequences.
316  *
317  * Input:
318  *                      buf:
319  *                              domain:         client domain name
320  *                              path:           export pathname
321  *                              maxsize:        numeric maximum size of
322  *                                              @buf
323  *                      size:   length of C string in @buf
324  * Output:
325  *      On success:     passed-in buffer filled with '\n'-terminated C
326  *                      string containing a ASCII hex text version
327  *                      of the NFS file handle;
328  *                      return code is the size in bytes of the string
329  *      On error:       return code is negative errno value
330  */
331 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
332 {
333         char *dname, *path;
334         int uninitialized_var(maxsize);
335         char *mesg = buf;
336         int len;
337         struct auth_domain *dom;
338         struct knfsd_fh fh;
339         struct net *net = file->f_dentry->d_sb->s_fs_info;
340
341         if (size == 0)
342                 return -EINVAL;
343
344         if (buf[size-1] != '\n')
345                 return -EINVAL;
346         buf[size-1] = 0;
347
348         dname = mesg;
349         len = qword_get(&mesg, dname, size);
350         if (len <= 0)
351                 return -EINVAL;
352         
353         path = dname+len+1;
354         len = qword_get(&mesg, path, size);
355         if (len <= 0)
356                 return -EINVAL;
357
358         len = get_int(&mesg, &maxsize);
359         if (len)
360                 return len;
361
362         if (maxsize < NFS_FHSIZE)
363                 return -EINVAL;
364         if (maxsize > NFS3_FHSIZE)
365                 maxsize = NFS3_FHSIZE;
366
367         if (qword_get(&mesg, mesg, size)>0)
368                 return -EINVAL;
369
370         /* we have all the words, they are in buf.. */
371         dom = unix_domain_find(dname);
372         if (!dom)
373                 return -ENOMEM;
374
375         len = exp_rootfh(net, dom, path, &fh,  maxsize);
376         auth_domain_put(dom);
377         if (len)
378                 return len;
379         
380         mesg = buf;
381         len = SIMPLE_TRANSACTION_LIMIT;
382         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
383         mesg[-1] = '\n';
384         return mesg - buf;      
385 }
386
387 /**
388  * write_threads - Start NFSD, or report the current number of running threads
389  *
390  * Input:
391  *                      buf:            ignored
392  *                      size:           zero
393  * Output:
394  *      On success:     passed-in buffer filled with '\n'-terminated C
395  *                      string numeric value representing the number of
396  *                      running NFSD threads;
397  *                      return code is the size in bytes of the string
398  *      On error:       return code is zero
399  *
400  * OR
401  *
402  * Input:
403  *                      buf:            C string containing an unsigned
404  *                                      integer value representing the
405  *                                      number of NFSD threads to start
406  *                      size:           non-zero length of C string in @buf
407  * Output:
408  *      On success:     NFS service is started;
409  *                      passed-in buffer filled with '\n'-terminated C
410  *                      string numeric value representing the number of
411  *                      running NFSD threads;
412  *                      return code is the size in bytes of the string
413  *      On error:       return code is zero or a negative errno value
414  */
415 static ssize_t write_threads(struct file *file, char *buf, size_t size)
416 {
417         char *mesg = buf;
418         int rv;
419         struct net *net = file->f_dentry->d_sb->s_fs_info;
420
421         if (size > 0) {
422                 int newthreads;
423                 rv = get_int(&mesg, &newthreads);
424                 if (rv)
425                         return rv;
426                 if (newthreads < 0)
427                         return -EINVAL;
428                 rv = nfsd_svc(newthreads, net);
429                 if (rv < 0)
430                         return rv;
431         } else
432                 rv = nfsd_nrthreads(net);
433
434         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
435 }
436
437 /**
438  * write_pool_threads - Set or report the current number of threads per pool
439  *
440  * Input:
441  *                      buf:            ignored
442  *                      size:           zero
443  *
444  * OR
445  *
446  * Input:
447  *                      buf:            C string containing whitespace-
448  *                                      separated unsigned integer values
449  *                                      representing the number of NFSD
450  *                                      threads to start in each pool
451  *                      size:           non-zero length of C string in @buf
452  * Output:
453  *      On success:     passed-in buffer filled with '\n'-terminated C
454  *                      string containing integer values representing the
455  *                      number of NFSD threads in each pool;
456  *                      return code is the size in bytes of the string
457  *      On error:       return code is zero or a negative errno value
458  */
459 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
460 {
461         /* if size > 0, look for an array of number of threads per node
462          * and apply them  then write out number of threads per node as reply
463          */
464         char *mesg = buf;
465         int i;
466         int rv;
467         int len;
468         int npools;
469         int *nthreads;
470         struct net *net = file->f_dentry->d_sb->s_fs_info;
471
472         mutex_lock(&nfsd_mutex);
473         npools = nfsd_nrpools(net);
474         if (npools == 0) {
475                 /*
476                  * NFS is shut down.  The admin can start it by
477                  * writing to the threads file but NOT the pool_threads
478                  * file, sorry.  Report zero threads.
479                  */
480                 mutex_unlock(&nfsd_mutex);
481                 strcpy(buf, "0\n");
482                 return strlen(buf);
483         }
484
485         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
486         rv = -ENOMEM;
487         if (nthreads == NULL)
488                 goto out_free;
489
490         if (size > 0) {
491                 for (i = 0; i < npools; i++) {
492                         rv = get_int(&mesg, &nthreads[i]);
493                         if (rv == -ENOENT)
494                                 break;          /* fewer numbers than pools */
495                         if (rv)
496                                 goto out_free;  /* syntax error */
497                         rv = -EINVAL;
498                         if (nthreads[i] < 0)
499                                 goto out_free;
500                 }
501                 rv = nfsd_set_nrthreads(i, nthreads, net);
502                 if (rv)
503                         goto out_free;
504         }
505
506         rv = nfsd_get_nrthreads(npools, nthreads, net);
507         if (rv)
508                 goto out_free;
509
510         mesg = buf;
511         size = SIMPLE_TRANSACTION_LIMIT;
512         for (i = 0; i < npools && size > 0; i++) {
513                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
514                 len = strlen(mesg);
515                 size -= len;
516                 mesg += len;
517         }
518         rv = mesg - buf;
519 out_free:
520         kfree(nthreads);
521         mutex_unlock(&nfsd_mutex);
522         return rv;
523 }
524
525 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
526 {
527         char *mesg = buf;
528         char *vers, *minorp, sign;
529         int len, num, remaining;
530         unsigned minor;
531         ssize_t tlen = 0;
532         char *sep;
533         struct net *net = file->f_dentry->d_sb->s_fs_info;
534         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
535
536         if (size>0) {
537                 if (nn->nfsd_serv)
538                         /* Cannot change versions without updating
539                          * nn->nfsd_serv->sv_xdrsize, and reallocing
540                          * rq_argp and rq_resp
541                          */
542                         return -EBUSY;
543                 if (buf[size-1] != '\n')
544                         return -EINVAL;
545                 buf[size-1] = 0;
546
547                 vers = mesg;
548                 len = qword_get(&mesg, vers, size);
549                 if (len <= 0) return -EINVAL;
550                 do {
551                         sign = *vers;
552                         if (sign == '+' || sign == '-')
553                                 num = simple_strtol((vers+1), &minorp, 0);
554                         else
555                                 num = simple_strtol(vers, &minorp, 0);
556                         if (*minorp == '.') {
557                                 if (num != 4)
558                                         return -EINVAL;
559                                 minor = simple_strtoul(minorp+1, NULL, 0);
560                                 if (minor == 0)
561                                         return -EINVAL;
562                                 if (nfsd_minorversion(minor, sign == '-' ?
563                                                      NFSD_CLEAR : NFSD_SET) < 0)
564                                         return -EINVAL;
565                                 goto next;
566                         }
567                         switch(num) {
568                         case 2:
569                         case 3:
570                         case 4:
571                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
572                                 break;
573                         default:
574                                 return -EINVAL;
575                         }
576                 next:
577                         vers += len + 1;
578                 } while ((len = qword_get(&mesg, vers, size)) > 0);
579                 /* If all get turned off, turn them back on, as
580                  * having no versions is BAD
581                  */
582                 nfsd_reset_versions();
583         }
584
585         /* Now write current state into reply buffer */
586         len = 0;
587         sep = "";
588         remaining = SIMPLE_TRANSACTION_LIMIT;
589         for (num=2 ; num <= 4 ; num++)
590                 if (nfsd_vers(num, NFSD_AVAIL)) {
591                         len = snprintf(buf, remaining, "%s%c%d", sep,
592                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
593                                        num);
594                         sep = " ";
595
596                         if (len > remaining)
597                                 break;
598                         remaining -= len;
599                         buf += len;
600                         tlen += len;
601                 }
602         if (nfsd_vers(4, NFSD_AVAIL))
603                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
604                      minor++) {
605                         len = snprintf(buf, remaining, " %c4.%u",
606                                         (nfsd_vers(4, NFSD_TEST) &&
607                                          nfsd_minorversion(minor, NFSD_TEST)) ?
608                                                 '+' : '-',
609                                         minor);
610
611                         if (len > remaining)
612                                 break;
613                         remaining -= len;
614                         buf += len;
615                         tlen += len;
616                 }
617
618         len = snprintf(buf, remaining, "\n");
619         if (len > remaining)
620                 return -EINVAL;
621         return tlen + len;
622 }
623
624 /**
625  * write_versions - Set or report the available NFS protocol versions
626  *
627  * Input:
628  *                      buf:            ignored
629  *                      size:           zero
630  * Output:
631  *      On success:     passed-in buffer filled with '\n'-terminated C
632  *                      string containing positive or negative integer
633  *                      values representing the current status of each
634  *                      protocol version;
635  *                      return code is the size in bytes of the string
636  *      On error:       return code is zero or a negative errno value
637  *
638  * OR
639  *
640  * Input:
641  *                      buf:            C string containing whitespace-
642  *                                      separated positive or negative
643  *                                      integer values representing NFS
644  *                                      protocol versions to enable ("+n")
645  *                                      or disable ("-n")
646  *                      size:           non-zero length of C string in @buf
647  * Output:
648  *      On success:     status of zero or more protocol versions has
649  *                      been updated; passed-in buffer filled with
650  *                      '\n'-terminated C string containing positive
651  *                      or negative integer values representing the
652  *                      current status of each protocol version;
653  *                      return code is the size in bytes of the string
654  *      On error:       return code is zero or a negative errno value
655  */
656 static ssize_t write_versions(struct file *file, char *buf, size_t size)
657 {
658         ssize_t rv;
659
660         mutex_lock(&nfsd_mutex);
661         rv = __write_versions(file, buf, size);
662         mutex_unlock(&nfsd_mutex);
663         return rv;
664 }
665
666 /*
667  * Zero-length write.  Return a list of NFSD's current listener
668  * transports.
669  */
670 static ssize_t __write_ports_names(char *buf, struct net *net)
671 {
672         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
673
674         if (nn->nfsd_serv == NULL)
675                 return 0;
676         return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
677 }
678
679 /*
680  * A single 'fd' number was written, in which case it must be for
681  * a socket of a supported family/protocol, and we use it as an
682  * nfsd listener.
683  */
684 static ssize_t __write_ports_addfd(char *buf, struct net *net)
685 {
686         char *mesg = buf;
687         int fd, err;
688         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
689
690         err = get_int(&mesg, &fd);
691         if (err != 0 || fd < 0)
692                 return -EINVAL;
693
694         err = nfsd_create_serv(net);
695         if (err != 0)
696                 return err;
697
698         err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
699         if (err < 0) {
700                 nfsd_destroy(net);
701                 return err;
702         }
703
704         /* Decrease the count, but don't shut down the service */
705         nn->nfsd_serv->sv_nrthreads--;
706         return err;
707 }
708
709 /*
710  * A transport listener is added by writing it's transport name and
711  * a port number.
712  */
713 static ssize_t __write_ports_addxprt(char *buf, struct net *net)
714 {
715         char transport[16];
716         struct svc_xprt *xprt;
717         int port, err;
718         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
719
720         if (sscanf(buf, "%15s %5u", transport, &port) != 2)
721                 return -EINVAL;
722
723         if (port < 1 || port > USHRT_MAX)
724                 return -EINVAL;
725
726         err = nfsd_create_serv(net);
727         if (err != 0)
728                 return err;
729
730         err = svc_create_xprt(nn->nfsd_serv, transport, net,
731                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
732         if (err < 0)
733                 goto out_err;
734
735         err = svc_create_xprt(nn->nfsd_serv, transport, net,
736                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
737         if (err < 0 && err != -EAFNOSUPPORT)
738                 goto out_close;
739
740         /* Decrease the count, but don't shut down the service */
741         nn->nfsd_serv->sv_nrthreads--;
742         return 0;
743 out_close:
744         xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
745         if (xprt != NULL) {
746                 svc_close_xprt(xprt);
747                 svc_xprt_put(xprt);
748         }
749 out_err:
750         nfsd_destroy(net);
751         return err;
752 }
753
754 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
755                              struct net *net)
756 {
757         if (size == 0)
758                 return __write_ports_names(buf, net);
759
760         if (isdigit(buf[0]))
761                 return __write_ports_addfd(buf, net);
762
763         if (isalpha(buf[0]))
764                 return __write_ports_addxprt(buf, net);
765
766         return -EINVAL;
767 }
768
769 /**
770  * write_ports - Pass a socket file descriptor or transport name to listen on
771  *
772  * Input:
773  *                      buf:            ignored
774  *                      size:           zero
775  * Output:
776  *      On success:     passed-in buffer filled with a '\n'-terminated C
777  *                      string containing a whitespace-separated list of
778  *                      named NFSD listeners;
779  *                      return code is the size in bytes of the string
780  *      On error:       return code is zero or a negative errno value
781  *
782  * OR
783  *
784  * Input:
785  *                      buf:            C string containing an unsigned
786  *                                      integer value representing a bound
787  *                                      but unconnected socket that is to be
788  *                                      used as an NFSD listener; listen(3)
789  *                                      must be called for a SOCK_STREAM
790  *                                      socket, otherwise it is ignored
791  *                      size:           non-zero length of C string in @buf
792  * Output:
793  *      On success:     NFS service is started;
794  *                      passed-in buffer filled with a '\n'-terminated C
795  *                      string containing a unique alphanumeric name of
796  *                      the listener;
797  *                      return code is the size in bytes of the string
798  *      On error:       return code is a negative errno value
799  *
800  * OR
801  *
802  * Input:
803  *                      buf:            C string containing a transport
804  *                                      name and an unsigned integer value
805  *                                      representing the port to listen on,
806  *                                      separated by whitespace
807  *                      size:           non-zero length of C string in @buf
808  * Output:
809  *      On success:     returns zero; NFS service is started
810  *      On error:       return code is a negative errno value
811  */
812 static ssize_t write_ports(struct file *file, char *buf, size_t size)
813 {
814         ssize_t rv;
815         struct net *net = file->f_dentry->d_sb->s_fs_info;
816
817         mutex_lock(&nfsd_mutex);
818         rv = __write_ports(file, buf, size, net);
819         mutex_unlock(&nfsd_mutex);
820         return rv;
821 }
822
823
824 int nfsd_max_blksize;
825
826 /**
827  * write_maxblksize - Set or report the current NFS blksize
828  *
829  * Input:
830  *                      buf:            ignored
831  *                      size:           zero
832  *
833  * OR
834  *
835  * Input:
836  *                      buf:            C string containing an unsigned
837  *                                      integer value representing the new
838  *                                      NFS blksize
839  *                      size:           non-zero length of C string in @buf
840  * Output:
841  *      On success:     passed-in buffer filled with '\n'-terminated C string
842  *                      containing numeric value of the current NFS blksize
843  *                      setting;
844  *                      return code is the size in bytes of the string
845  *      On error:       return code is zero or a negative errno value
846  */
847 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
848 {
849         char *mesg = buf;
850         struct net *net = file->f_dentry->d_sb->s_fs_info;
851         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
852
853         if (size > 0) {
854                 int bsize;
855                 int rv = get_int(&mesg, &bsize);
856                 if (rv)
857                         return rv;
858                 /* force bsize into allowed range and
859                  * required alignment.
860                  */
861                 if (bsize < 1024)
862                         bsize = 1024;
863                 if (bsize > NFSSVC_MAXBLKSIZE)
864                         bsize = NFSSVC_MAXBLKSIZE;
865                 bsize &= ~(1024-1);
866                 mutex_lock(&nfsd_mutex);
867                 if (nn->nfsd_serv) {
868                         mutex_unlock(&nfsd_mutex);
869                         return -EBUSY;
870                 }
871                 nfsd_max_blksize = bsize;
872                 mutex_unlock(&nfsd_mutex);
873         }
874
875         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
876                                                         nfsd_max_blksize);
877 }
878
879 #ifdef CONFIG_NFSD_V4
880 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
881                                   time_t *time, struct nfsd_net *nn)
882 {
883         char *mesg = buf;
884         int rv, i;
885
886         if (size > 0) {
887                 if (nn->nfsd_serv)
888                         return -EBUSY;
889                 rv = get_int(&mesg, &i);
890                 if (rv)
891                         return rv;
892                 /*
893                  * Some sanity checking.  We don't have a reason for
894                  * these particular numbers, but problems with the
895                  * extremes are:
896                  *      - Too short: the briefest network outage may
897                  *        cause clients to lose all their locks.  Also,
898                  *        the frequent polling may be wasteful.
899                  *      - Too long: do you really want reboot recovery
900                  *        to take more than an hour?  Or to make other
901                  *        clients wait an hour before being able to
902                  *        revoke a dead client's locks?
903                  */
904                 if (i < 10 || i > 3600)
905                         return -EINVAL;
906                 *time = i;
907         }
908
909         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
910 }
911
912 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
913                                 time_t *time, struct nfsd_net *nn)
914 {
915         ssize_t rv;
916
917         mutex_lock(&nfsd_mutex);
918         rv = __nfsd4_write_time(file, buf, size, time, nn);
919         mutex_unlock(&nfsd_mutex);
920         return rv;
921 }
922
923 /**
924  * write_leasetime - Set or report the current NFSv4 lease time
925  *
926  * Input:
927  *                      buf:            ignored
928  *                      size:           zero
929  *
930  * OR
931  *
932  * Input:
933  *                      buf:            C string containing an unsigned
934  *                                      integer value representing the new
935  *                                      NFSv4 lease expiry time
936  *                      size:           non-zero length of C string in @buf
937  * Output:
938  *      On success:     passed-in buffer filled with '\n'-terminated C
939  *                      string containing unsigned integer value of the
940  *                      current lease expiry time;
941  *                      return code is the size in bytes of the string
942  *      On error:       return code is zero or a negative errno value
943  */
944 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
945 {
946         struct net *net = file->f_dentry->d_sb->s_fs_info;
947         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
948         return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
949 }
950
951 /**
952  * write_gracetime - Set or report current NFSv4 grace period time
953  *
954  * As above, but sets the time of the NFSv4 grace period.
955  *
956  * Note this should never be set to less than the *previous*
957  * lease-period time, but we don't try to enforce this.  (In the common
958  * case (a new boot), we don't know what the previous lease time was
959  * anyway.)
960  */
961 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
962 {
963         struct net *net = file->f_dentry->d_sb->s_fs_info;
964         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
965         return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
966 }
967
968 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
969                                    struct nfsd_net *nn)
970 {
971         char *mesg = buf;
972         char *recdir;
973         int len, status;
974
975         if (size > 0) {
976                 if (nn->nfsd_serv)
977                         return -EBUSY;
978                 if (size > PATH_MAX || buf[size-1] != '\n')
979                         return -EINVAL;
980                 buf[size-1] = 0;
981
982                 recdir = mesg;
983                 len = qword_get(&mesg, recdir, size);
984                 if (len <= 0)
985                         return -EINVAL;
986
987                 status = nfs4_reset_recoverydir(recdir);
988                 if (status)
989                         return status;
990         }
991
992         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
993                                                         nfs4_recoverydir());
994 }
995
996 /**
997  * write_recoverydir - Set or report the pathname of the recovery directory
998  *
999  * Input:
1000  *                      buf:            ignored
1001  *                      size:           zero
1002  *
1003  * OR
1004  *
1005  * Input:
1006  *                      buf:            C string containing the pathname
1007  *                                      of the directory on a local file
1008  *                                      system containing permanent NFSv4
1009  *                                      recovery data
1010  *                      size:           non-zero length of C string in @buf
1011  * Output:
1012  *      On success:     passed-in buffer filled with '\n'-terminated C string
1013  *                      containing the current recovery pathname setting;
1014  *                      return code is the size in bytes of the string
1015  *      On error:       return code is zero or a negative errno value
1016  */
1017 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1018 {
1019         ssize_t rv;
1020         struct net *net = file->f_dentry->d_sb->s_fs_info;
1021         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1022
1023         mutex_lock(&nfsd_mutex);
1024         rv = __write_recoverydir(file, buf, size, nn);
1025         mutex_unlock(&nfsd_mutex);
1026         return rv;
1027 }
1028
1029 #endif
1030
1031 /*----------------------------------------------------------------------------*/
1032 /*
1033  *      populating the filesystem.
1034  */
1035
1036 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1037 {
1038         static struct tree_descr nfsd_files[] = {
1039                 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1040                 [NFSD_Export_features] = {"export_features",
1041                                         &export_features_operations, S_IRUGO},
1042                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1043                                         &transaction_ops, S_IWUSR|S_IRUSR},
1044                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1045                                         &transaction_ops, S_IWUSR|S_IRUSR},
1046                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1047                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1048                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1049                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1050                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1051                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1052                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1053 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1054                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1055 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1056 #ifdef CONFIG_NFSD_V4
1057                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1058                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1059                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1060 #endif
1061                 /* last one */ {""}
1062         };
1063         struct net *net = data;
1064         int ret;
1065
1066         ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1067         if (ret)
1068                 return ret;
1069         sb->s_fs_info = get_net(net);
1070         return 0;
1071 }
1072
1073 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1074         int flags, const char *dev_name, void *data)
1075 {
1076         return mount_ns(fs_type, flags, current->nsproxy->net_ns, nfsd_fill_super);
1077 }
1078
1079 static void nfsd_umount(struct super_block *sb)
1080 {
1081         struct net *net = sb->s_fs_info;
1082
1083         kill_litter_super(sb);
1084         put_net(net);
1085 }
1086
1087 static struct file_system_type nfsd_fs_type = {
1088         .owner          = THIS_MODULE,
1089         .name           = "nfsd",
1090         .mount          = nfsd_mount,
1091         .kill_sb        = nfsd_umount,
1092 };
1093 MODULE_ALIAS_FS("nfsd");
1094
1095 #ifdef CONFIG_PROC_FS
1096 static int create_proc_exports_entry(void)
1097 {
1098         struct proc_dir_entry *entry;
1099
1100         entry = proc_mkdir("fs/nfs", NULL);
1101         if (!entry)
1102                 return -ENOMEM;
1103         entry = proc_create("exports", 0, entry,
1104                                  &exports_proc_operations);
1105         if (!entry)
1106                 return -ENOMEM;
1107         return 0;
1108 }
1109 #else /* CONFIG_PROC_FS */
1110 static int create_proc_exports_entry(void)
1111 {
1112         return 0;
1113 }
1114 #endif
1115
1116 int nfsd_net_id;
1117
1118 static __net_init int nfsd_init_net(struct net *net)
1119 {
1120         int retval;
1121         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1122
1123         retval = nfsd_export_init(net);
1124         if (retval)
1125                 goto out_export_error;
1126         retval = nfsd_idmap_init(net);
1127         if (retval)
1128                 goto out_idmap_error;
1129         nn->nfsd4_lease = 90;   /* default lease time */
1130         nn->nfsd4_grace = 90;
1131         return 0;
1132
1133 out_idmap_error:
1134         nfsd_export_shutdown(net);
1135 out_export_error:
1136         return retval;
1137 }
1138
1139 static __net_exit void nfsd_exit_net(struct net *net)
1140 {
1141         nfsd_idmap_shutdown(net);
1142         nfsd_export_shutdown(net);
1143 }
1144
1145 static struct pernet_operations nfsd_net_ops = {
1146         .init = nfsd_init_net,
1147         .exit = nfsd_exit_net,
1148         .id   = &nfsd_net_id,
1149         .size = sizeof(struct nfsd_net),
1150 };
1151
1152 static int __init init_nfsd(void)
1153 {
1154         int retval;
1155         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1156
1157         retval = register_cld_notifier();
1158         if (retval)
1159                 return retval;
1160         retval = register_pernet_subsys(&nfsd_net_ops);
1161         if (retval < 0)
1162                 goto out_unregister_notifier;
1163         retval = nfsd4_init_slabs();
1164         if (retval)
1165                 goto out_unregister_pernet;
1166         nfs4_state_init();
1167         retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1168         if (retval)
1169                 goto out_free_slabs;
1170         nfsd_stat_init();       /* Statistics */
1171         retval = nfsd_reply_cache_init();
1172         if (retval)
1173                 goto out_free_stat;
1174         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1175         retval = create_proc_exports_entry();
1176         if (retval)
1177                 goto out_free_lockd;
1178         retval = register_filesystem(&nfsd_fs_type);
1179         if (retval)
1180                 goto out_free_all;
1181         return 0;
1182 out_free_all:
1183         remove_proc_entry("fs/nfs/exports", NULL);
1184         remove_proc_entry("fs/nfs", NULL);
1185 out_free_lockd:
1186         nfsd_lockd_shutdown();
1187         nfsd_reply_cache_shutdown();
1188 out_free_stat:
1189         nfsd_stat_shutdown();
1190         nfsd_fault_inject_cleanup();
1191 out_free_slabs:
1192         nfsd4_free_slabs();
1193 out_unregister_pernet:
1194         unregister_pernet_subsys(&nfsd_net_ops);
1195 out_unregister_notifier:
1196         unregister_cld_notifier();
1197         return retval;
1198 }
1199
1200 static void __exit exit_nfsd(void)
1201 {
1202         nfsd_reply_cache_shutdown();
1203         remove_proc_entry("fs/nfs/exports", NULL);
1204         remove_proc_entry("fs/nfs", NULL);
1205         nfsd_stat_shutdown();
1206         nfsd_lockd_shutdown();
1207         nfsd4_free_slabs();
1208         nfsd_fault_inject_cleanup();
1209         unregister_filesystem(&nfsd_fs_type);
1210         unregister_pernet_subsys(&nfsd_net_ops);
1211         unregister_cld_notifier();
1212 }
1213
1214 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1215 MODULE_LICENSE("GPL");
1216 module_init(init_nfsd)
1217 module_exit(exit_nfsd)