Merge tag 'kcsan.2022.12.02a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmc...
[platform/kernel/linux-rpi.git] / fs / nfsd / nfsctl.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Syscall interface to knfsd.
4  *
5  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
6  */
7
8 #include <linux/slab.h>
9 #include <linux/namei.h>
10 #include <linux/ctype.h>
11 #include <linux/fs_context.h>
12
13 #include <linux/sunrpc/svcsock.h>
14 #include <linux/lockd/lockd.h>
15 #include <linux/sunrpc/addr.h>
16 #include <linux/sunrpc/gss_api.h>
17 #include <linux/sunrpc/gss_krb5_enctypes.h>
18 #include <linux/sunrpc/rpc_pipe_fs.h>
19 #include <linux/module.h>
20 #include <linux/fsnotify.h>
21
22 #include "idmap.h"
23 #include "nfsd.h"
24 #include "cache.h"
25 #include "state.h"
26 #include "netns.h"
27 #include "pnfs.h"
28 #include "filecache.h"
29
30 /*
31  *      We have a single directory with several nodes in it.
32  */
33 enum {
34         NFSD_Root = 1,
35         NFSD_List,
36         NFSD_Export_Stats,
37         NFSD_Export_features,
38         NFSD_Fh,
39         NFSD_FO_UnlockIP,
40         NFSD_FO_UnlockFS,
41         NFSD_Threads,
42         NFSD_Pool_Threads,
43         NFSD_Pool_Stats,
44         NFSD_Reply_Cache_Stats,
45         NFSD_Versions,
46         NFSD_Ports,
47         NFSD_MaxBlkSize,
48         NFSD_MaxConnections,
49         NFSD_Filecache,
50         NFSD_SupportedEnctypes,
51         /*
52          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
53          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
54          */
55 #ifdef CONFIG_NFSD_V4
56         NFSD_Leasetime,
57         NFSD_Gracetime,
58         NFSD_RecoveryDir,
59         NFSD_V4EndGrace,
60 #endif
61         NFSD_MaxReserved
62 };
63
64 /*
65  * write() for these nodes.
66  */
67 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
68 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
69 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
70 static ssize_t write_threads(struct file *file, char *buf, size_t size);
71 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
72 static ssize_t write_versions(struct file *file, char *buf, size_t size);
73 static ssize_t write_ports(struct file *file, char *buf, size_t size);
74 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
75 static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
76 #ifdef CONFIG_NFSD_V4
77 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
78 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
79 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
80 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
81 #endif
82
83 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
84         [NFSD_Fh] = write_filehandle,
85         [NFSD_FO_UnlockIP] = write_unlock_ip,
86         [NFSD_FO_UnlockFS] = write_unlock_fs,
87         [NFSD_Threads] = write_threads,
88         [NFSD_Pool_Threads] = write_pool_threads,
89         [NFSD_Versions] = write_versions,
90         [NFSD_Ports] = write_ports,
91         [NFSD_MaxBlkSize] = write_maxblksize,
92         [NFSD_MaxConnections] = write_maxconn,
93 #ifdef CONFIG_NFSD_V4
94         [NFSD_Leasetime] = write_leasetime,
95         [NFSD_Gracetime] = write_gracetime,
96         [NFSD_RecoveryDir] = write_recoverydir,
97         [NFSD_V4EndGrace] = write_v4_end_grace,
98 #endif
99 };
100
101 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
102 {
103         ino_t ino =  file_inode(file)->i_ino;
104         char *data;
105         ssize_t rv;
106
107         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
108                 return -EINVAL;
109
110         data = simple_transaction_get(file, buf, size);
111         if (IS_ERR(data))
112                 return PTR_ERR(data);
113
114         rv =  write_op[ino](file, data, size);
115         if (rv >= 0) {
116                 simple_transaction_set(file, rv);
117                 rv = size;
118         }
119         return rv;
120 }
121
122 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
123 {
124         if (! file->private_data) {
125                 /* An attempt to read a transaction file without writing
126                  * causes a 0-byte write so that the file can return
127                  * state information
128                  */
129                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
130                 if (rv < 0)
131                         return rv;
132         }
133         return simple_transaction_read(file, buf, size, pos);
134 }
135
136 static const struct file_operations transaction_ops = {
137         .write          = nfsctl_transaction_write,
138         .read           = nfsctl_transaction_read,
139         .release        = simple_transaction_release,
140         .llseek         = default_llseek,
141 };
142
143 static int exports_net_open(struct net *net, struct file *file)
144 {
145         int err;
146         struct seq_file *seq;
147         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
148
149         err = seq_open(file, &nfs_exports_op);
150         if (err)
151                 return err;
152
153         seq = file->private_data;
154         seq->private = nn->svc_export_cache;
155         return 0;
156 }
157
158 static int exports_proc_open(struct inode *inode, struct file *file)
159 {
160         return exports_net_open(current->nsproxy->net_ns, file);
161 }
162
163 static const struct proc_ops exports_proc_ops = {
164         .proc_open      = exports_proc_open,
165         .proc_read      = seq_read,
166         .proc_lseek     = seq_lseek,
167         .proc_release   = seq_release,
168 };
169
170 static int exports_nfsd_open(struct inode *inode, struct file *file)
171 {
172         return exports_net_open(inode->i_sb->s_fs_info, file);
173 }
174
175 static const struct file_operations exports_nfsd_operations = {
176         .open           = exports_nfsd_open,
177         .read           = seq_read,
178         .llseek         = seq_lseek,
179         .release        = seq_release,
180 };
181
182 static int export_features_show(struct seq_file *m, void *v)
183 {
184         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
185         return 0;
186 }
187
188 DEFINE_SHOW_ATTRIBUTE(export_features);
189
190 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
191 static int supported_enctypes_show(struct seq_file *m, void *v)
192 {
193         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
194         return 0;
195 }
196
197 DEFINE_SHOW_ATTRIBUTE(supported_enctypes);
198 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
199
200 static const struct file_operations pool_stats_operations = {
201         .open           = nfsd_pool_stats_open,
202         .read           = seq_read,
203         .llseek         = seq_lseek,
204         .release        = nfsd_pool_stats_release,
205 };
206
207 DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats);
208
209 DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats);
210
211 /*----------------------------------------------------------------------------*/
212 /*
213  * payload - write methods
214  */
215
216 static inline struct net *netns(struct file *file)
217 {
218         return file_inode(file)->i_sb->s_fs_info;
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 = netns(file);
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 maxsize;
335         char *mesg = buf;
336         int len;
337         struct auth_domain *dom;
338         struct knfsd_fh fh;
339
340         if (size == 0)
341                 return -EINVAL;
342
343         if (buf[size-1] != '\n')
344                 return -EINVAL;
345         buf[size-1] = 0;
346
347         dname = mesg;
348         len = qword_get(&mesg, dname, size);
349         if (len <= 0)
350                 return -EINVAL;
351         
352         path = dname+len+1;
353         len = qword_get(&mesg, path, size);
354         if (len <= 0)
355                 return -EINVAL;
356
357         len = get_int(&mesg, &maxsize);
358         if (len)
359                 return len;
360
361         if (maxsize < NFS_FHSIZE)
362                 return -EINVAL;
363         maxsize = min(maxsize, NFS3_FHSIZE);
364
365         if (qword_get(&mesg, mesg, size)>0)
366                 return -EINVAL;
367
368         /* we have all the words, they are in buf.. */
369         dom = unix_domain_find(dname);
370         if (!dom)
371                 return -ENOMEM;
372
373         len = exp_rootfh(netns(file), dom, path, &fh,  maxsize);
374         auth_domain_put(dom);
375         if (len)
376                 return len;
377
378         mesg = buf;
379         len = SIMPLE_TRANSACTION_LIMIT;
380         qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size);
381         mesg[-1] = '\n';
382         return mesg - buf;
383 }
384
385 /*
386  * write_threads - Start NFSD, or report the current number of running threads
387  *
388  * Input:
389  *                      buf:            ignored
390  *                      size:           zero
391  * Output:
392  *      On success:     passed-in buffer filled with '\n'-terminated C
393  *                      string numeric value representing the number of
394  *                      running NFSD threads;
395  *                      return code is the size in bytes of the string
396  *      On error:       return code is zero
397  *
398  * OR
399  *
400  * Input:
401  *                      buf:            C string containing an unsigned
402  *                                      integer value representing the
403  *                                      number of NFSD threads to start
404  *                      size:           non-zero length of C string in @buf
405  * Output:
406  *      On success:     NFS service is started;
407  *                      passed-in buffer filled with '\n'-terminated C
408  *                      string numeric value representing the number of
409  *                      running NFSD threads;
410  *                      return code is the size in bytes of the string
411  *      On error:       return code is zero or a negative errno value
412  */
413 static ssize_t write_threads(struct file *file, char *buf, size_t size)
414 {
415         char *mesg = buf;
416         int rv;
417         struct net *net = netns(file);
418
419         if (size > 0) {
420                 int newthreads;
421                 rv = get_int(&mesg, &newthreads);
422                 if (rv)
423                         return rv;
424                 if (newthreads < 0)
425                         return -EINVAL;
426                 rv = nfsd_svc(newthreads, net, file->f_cred);
427                 if (rv < 0)
428                         return rv;
429         } else
430                 rv = nfsd_nrthreads(net);
431
432         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
433 }
434
435 /*
436  * write_pool_threads - Set or report the current number of threads per pool
437  *
438  * Input:
439  *                      buf:            ignored
440  *                      size:           zero
441  *
442  * OR
443  *
444  * Input:
445  *                      buf:            C string containing whitespace-
446  *                                      separated unsigned integer values
447  *                                      representing the number of NFSD
448  *                                      threads to start in each pool
449  *                      size:           non-zero length of C string in @buf
450  * Output:
451  *      On success:     passed-in buffer filled with '\n'-terminated C
452  *                      string containing integer values representing the
453  *                      number of NFSD threads in each pool;
454  *                      return code is the size in bytes of the string
455  *      On error:       return code is zero or a negative errno value
456  */
457 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
458 {
459         /* if size > 0, look for an array of number of threads per node
460          * and apply them  then write out number of threads per node as reply
461          */
462         char *mesg = buf;
463         int i;
464         int rv;
465         int len;
466         int npools;
467         int *nthreads;
468         struct net *net = netns(file);
469
470         mutex_lock(&nfsd_mutex);
471         npools = nfsd_nrpools(net);
472         if (npools == 0) {
473                 /*
474                  * NFS is shut down.  The admin can start it by
475                  * writing to the threads file but NOT the pool_threads
476                  * file, sorry.  Report zero threads.
477                  */
478                 mutex_unlock(&nfsd_mutex);
479                 strcpy(buf, "0\n");
480                 return strlen(buf);
481         }
482
483         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
484         rv = -ENOMEM;
485         if (nthreads == NULL)
486                 goto out_free;
487
488         if (size > 0) {
489                 for (i = 0; i < npools; i++) {
490                         rv = get_int(&mesg, &nthreads[i]);
491                         if (rv == -ENOENT)
492                                 break;          /* fewer numbers than pools */
493                         if (rv)
494                                 goto out_free;  /* syntax error */
495                         rv = -EINVAL;
496                         if (nthreads[i] < 0)
497                                 goto out_free;
498                 }
499                 rv = nfsd_set_nrthreads(i, nthreads, net);
500                 if (rv)
501                         goto out_free;
502         }
503
504         rv = nfsd_get_nrthreads(npools, nthreads, net);
505         if (rv)
506                 goto out_free;
507
508         mesg = buf;
509         size = SIMPLE_TRANSACTION_LIMIT;
510         for (i = 0; i < npools && size > 0; i++) {
511                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
512                 len = strlen(mesg);
513                 size -= len;
514                 mesg += len;
515         }
516         rv = mesg - buf;
517 out_free:
518         kfree(nthreads);
519         mutex_unlock(&nfsd_mutex);
520         return rv;
521 }
522
523 static ssize_t
524 nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
525                 const char *sep, unsigned vers, int minor)
526 {
527         const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
528         bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
529
530         if (vers == 4 && minor >= 0 &&
531             !nfsd_minorversion(nn, minor, NFSD_TEST))
532                 supported = false;
533         if (minor == 0 && supported)
534                 /*
535                  * special case for backward compatability.
536                  * +4.0 is never reported, it is implied by
537                  * +4, unless -4.0 is present.
538                  */
539                 return 0;
540         return snprintf(buf, remaining, format, sep,
541                         supported ? '+' : '-', vers, minor);
542 }
543
544 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
545 {
546         char *mesg = buf;
547         char *vers, *minorp, sign;
548         int len, num, remaining;
549         ssize_t tlen = 0;
550         char *sep;
551         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
552
553         if (size>0) {
554                 if (nn->nfsd_serv)
555                         /* Cannot change versions without updating
556                          * nn->nfsd_serv->sv_xdrsize, and reallocing
557                          * rq_argp and rq_resp
558                          */
559                         return -EBUSY;
560                 if (buf[size-1] != '\n')
561                         return -EINVAL;
562                 buf[size-1] = 0;
563
564                 vers = mesg;
565                 len = qword_get(&mesg, vers, size);
566                 if (len <= 0) return -EINVAL;
567                 do {
568                         enum vers_op cmd;
569                         unsigned minor;
570                         sign = *vers;
571                         if (sign == '+' || sign == '-')
572                                 num = simple_strtol((vers+1), &minorp, 0);
573                         else
574                                 num = simple_strtol(vers, &minorp, 0);
575                         if (*minorp == '.') {
576                                 if (num != 4)
577                                         return -EINVAL;
578                                 if (kstrtouint(minorp+1, 0, &minor) < 0)
579                                         return -EINVAL;
580                         }
581
582                         cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
583                         switch(num) {
584                         case 2:
585                         case 3:
586                                 nfsd_vers(nn, num, cmd);
587                                 break;
588                         case 4:
589                                 if (*minorp == '.') {
590                                         if (nfsd_minorversion(nn, minor, cmd) < 0)
591                                                 return -EINVAL;
592                                 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
593                                         /*
594                                          * Either we have +4 and no minors are enabled,
595                                          * or we have -4 and at least one minor is enabled.
596                                          * In either case, propagate 'cmd' to all minors.
597                                          */
598                                         minor = 0;
599                                         while (nfsd_minorversion(nn, minor, cmd) >= 0)
600                                                 minor++;
601                                 }
602                                 break;
603                         default:
604                                 return -EINVAL;
605                         }
606                         vers += len + 1;
607                 } while ((len = qword_get(&mesg, vers, size)) > 0);
608                 /* If all get turned off, turn them back on, as
609                  * having no versions is BAD
610                  */
611                 nfsd_reset_versions(nn);
612         }
613
614         /* Now write current state into reply buffer */
615         sep = "";
616         remaining = SIMPLE_TRANSACTION_LIMIT;
617         for (num=2 ; num <= 4 ; num++) {
618                 int minor;
619                 if (!nfsd_vers(nn, num, NFSD_AVAIL))
620                         continue;
621
622                 minor = -1;
623                 do {
624                         len = nfsd_print_version_support(nn, buf, remaining,
625                                         sep, num, minor);
626                         if (len >= remaining)
627                                 goto out;
628                         remaining -= len;
629                         buf += len;
630                         tlen += len;
631                         minor++;
632                         if (len)
633                                 sep = " ";
634                 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
635         }
636 out:
637         len = snprintf(buf, remaining, "\n");
638         if (len >= remaining)
639                 return -EINVAL;
640         return tlen + len;
641 }
642
643 /*
644  * write_versions - Set or report the available NFS protocol versions
645  *
646  * Input:
647  *                      buf:            ignored
648  *                      size:           zero
649  * Output:
650  *      On success:     passed-in buffer filled with '\n'-terminated C
651  *                      string containing positive or negative integer
652  *                      values representing the current status of each
653  *                      protocol version;
654  *                      return code is the size in bytes of the string
655  *      On error:       return code is zero or a negative errno value
656  *
657  * OR
658  *
659  * Input:
660  *                      buf:            C string containing whitespace-
661  *                                      separated positive or negative
662  *                                      integer values representing NFS
663  *                                      protocol versions to enable ("+n")
664  *                                      or disable ("-n")
665  *                      size:           non-zero length of C string in @buf
666  * Output:
667  *      On success:     status of zero or more protocol versions has
668  *                      been updated; passed-in buffer filled with
669  *                      '\n'-terminated C string containing positive
670  *                      or negative integer values representing the
671  *                      current status of each protocol version;
672  *                      return code is the size in bytes of the string
673  *      On error:       return code is zero or a negative errno value
674  */
675 static ssize_t write_versions(struct file *file, char *buf, size_t size)
676 {
677         ssize_t rv;
678
679         mutex_lock(&nfsd_mutex);
680         rv = __write_versions(file, buf, size);
681         mutex_unlock(&nfsd_mutex);
682         return rv;
683 }
684
685 /*
686  * Zero-length write.  Return a list of NFSD's current listener
687  * transports.
688  */
689 static ssize_t __write_ports_names(char *buf, struct net *net)
690 {
691         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
692
693         if (nn->nfsd_serv == NULL)
694                 return 0;
695         return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
696 }
697
698 /*
699  * A single 'fd' number was written, in which case it must be for
700  * a socket of a supported family/protocol, and we use it as an
701  * nfsd listener.
702  */
703 static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
704 {
705         char *mesg = buf;
706         int fd, err;
707         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
708
709         err = get_int(&mesg, &fd);
710         if (err != 0 || fd < 0)
711                 return -EINVAL;
712
713         if (svc_alien_sock(net, fd)) {
714                 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
715                 return -EINVAL;
716         }
717
718         err = nfsd_create_serv(net);
719         if (err != 0)
720                 return err;
721
722         err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
723
724         if (err >= 0 &&
725             !nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1))
726                 svc_get(nn->nfsd_serv);
727
728         nfsd_put(net);
729         return err;
730 }
731
732 /*
733  * A transport listener is added by writing it's transport name and
734  * a port number.
735  */
736 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
737 {
738         char transport[16];
739         struct svc_xprt *xprt;
740         int port, err;
741         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
742
743         if (sscanf(buf, "%15s %5u", transport, &port) != 2)
744                 return -EINVAL;
745
746         if (port < 1 || port > USHRT_MAX)
747                 return -EINVAL;
748
749         err = nfsd_create_serv(net);
750         if (err != 0)
751                 return err;
752
753         err = svc_xprt_create(nn->nfsd_serv, transport, net,
754                               PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
755         if (err < 0)
756                 goto out_err;
757
758         err = svc_xprt_create(nn->nfsd_serv, transport, net,
759                               PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
760         if (err < 0 && err != -EAFNOSUPPORT)
761                 goto out_close;
762
763         if (!nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1))
764                 svc_get(nn->nfsd_serv);
765
766         nfsd_put(net);
767         return 0;
768 out_close:
769         xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
770         if (xprt != NULL) {
771                 svc_xprt_close(xprt);
772                 svc_xprt_put(xprt);
773         }
774 out_err:
775         nfsd_put(net);
776         return err;
777 }
778
779 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
780                              struct net *net)
781 {
782         if (size == 0)
783                 return __write_ports_names(buf, net);
784
785         if (isdigit(buf[0]))
786                 return __write_ports_addfd(buf, net, file->f_cred);
787
788         if (isalpha(buf[0]))
789                 return __write_ports_addxprt(buf, net, file->f_cred);
790
791         return -EINVAL;
792 }
793
794 /*
795  * write_ports - Pass a socket file descriptor or transport name to listen on
796  *
797  * Input:
798  *                      buf:            ignored
799  *                      size:           zero
800  * Output:
801  *      On success:     passed-in buffer filled with a '\n'-terminated C
802  *                      string containing a whitespace-separated list of
803  *                      named NFSD listeners;
804  *                      return code is the size in bytes of the string
805  *      On error:       return code is zero or a negative errno value
806  *
807  * OR
808  *
809  * Input:
810  *                      buf:            C string containing an unsigned
811  *                                      integer value representing a bound
812  *                                      but unconnected socket that is to be
813  *                                      used as an NFSD listener; listen(3)
814  *                                      must be called for a SOCK_STREAM
815  *                                      socket, otherwise it is ignored
816  *                      size:           non-zero length of C string in @buf
817  * Output:
818  *      On success:     NFS service is started;
819  *                      passed-in buffer filled with a '\n'-terminated C
820  *                      string containing a unique alphanumeric name of
821  *                      the listener;
822  *                      return code is the size in bytes of the string
823  *      On error:       return code is a negative errno value
824  *
825  * OR
826  *
827  * Input:
828  *                      buf:            C string containing a transport
829  *                                      name and an unsigned integer value
830  *                                      representing the port to listen on,
831  *                                      separated by whitespace
832  *                      size:           non-zero length of C string in @buf
833  * Output:
834  *      On success:     returns zero; NFS service is started
835  *      On error:       return code is a negative errno value
836  */
837 static ssize_t write_ports(struct file *file, char *buf, size_t size)
838 {
839         ssize_t rv;
840
841         mutex_lock(&nfsd_mutex);
842         rv = __write_ports(file, buf, size, netns(file));
843         mutex_unlock(&nfsd_mutex);
844         return rv;
845 }
846
847
848 int nfsd_max_blksize;
849
850 /*
851  * write_maxblksize - Set or report the current NFS blksize
852  *
853  * Input:
854  *                      buf:            ignored
855  *                      size:           zero
856  *
857  * OR
858  *
859  * Input:
860  *                      buf:            C string containing an unsigned
861  *                                      integer value representing the new
862  *                                      NFS blksize
863  *                      size:           non-zero length of C string in @buf
864  * Output:
865  *      On success:     passed-in buffer filled with '\n'-terminated C string
866  *                      containing numeric value of the current NFS blksize
867  *                      setting;
868  *                      return code is the size in bytes of the string
869  *      On error:       return code is zero or a negative errno value
870  */
871 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
872 {
873         char *mesg = buf;
874         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
875
876         if (size > 0) {
877                 int bsize;
878                 int rv = get_int(&mesg, &bsize);
879                 if (rv)
880                         return rv;
881                 /* force bsize into allowed range and
882                  * required alignment.
883                  */
884                 bsize = max_t(int, bsize, 1024);
885                 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
886                 bsize &= ~(1024-1);
887                 mutex_lock(&nfsd_mutex);
888                 if (nn->nfsd_serv) {
889                         mutex_unlock(&nfsd_mutex);
890                         return -EBUSY;
891                 }
892                 nfsd_max_blksize = bsize;
893                 mutex_unlock(&nfsd_mutex);
894         }
895
896         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
897                                                         nfsd_max_blksize);
898 }
899
900 /*
901  * write_maxconn - Set or report the current max number of connections
902  *
903  * Input:
904  *                      buf:            ignored
905  *                      size:           zero
906  * OR
907  *
908  * Input:
909  *                      buf:            C string containing an unsigned
910  *                                      integer value representing the new
911  *                                      number of max connections
912  *                      size:           non-zero length of C string in @buf
913  * Output:
914  *      On success:     passed-in buffer filled with '\n'-terminated C string
915  *                      containing numeric value of max_connections setting
916  *                      for this net namespace;
917  *                      return code is the size in bytes of the string
918  *      On error:       return code is zero or a negative errno value
919  */
920 static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
921 {
922         char *mesg = buf;
923         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
924         unsigned int maxconn = nn->max_connections;
925
926         if (size > 0) {
927                 int rv = get_uint(&mesg, &maxconn);
928
929                 if (rv)
930                         return rv;
931                 nn->max_connections = maxconn;
932         }
933
934         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
935 }
936
937 #ifdef CONFIG_NFSD_V4
938 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
939                                   time64_t *time, struct nfsd_net *nn)
940 {
941         char *mesg = buf;
942         int rv, i;
943
944         if (size > 0) {
945                 if (nn->nfsd_serv)
946                         return -EBUSY;
947                 rv = get_int(&mesg, &i);
948                 if (rv)
949                         return rv;
950                 /*
951                  * Some sanity checking.  We don't have a reason for
952                  * these particular numbers, but problems with the
953                  * extremes are:
954                  *      - Too short: the briefest network outage may
955                  *        cause clients to lose all their locks.  Also,
956                  *        the frequent polling may be wasteful.
957                  *      - Too long: do you really want reboot recovery
958                  *        to take more than an hour?  Or to make other
959                  *        clients wait an hour before being able to
960                  *        revoke a dead client's locks?
961                  */
962                 if (i < 10 || i > 3600)
963                         return -EINVAL;
964                 *time = i;
965         }
966
967         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time);
968 }
969
970 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
971                                 time64_t *time, struct nfsd_net *nn)
972 {
973         ssize_t rv;
974
975         mutex_lock(&nfsd_mutex);
976         rv = __nfsd4_write_time(file, buf, size, time, nn);
977         mutex_unlock(&nfsd_mutex);
978         return rv;
979 }
980
981 /*
982  * write_leasetime - Set or report the current NFSv4 lease time
983  *
984  * Input:
985  *                      buf:            ignored
986  *                      size:           zero
987  *
988  * OR
989  *
990  * Input:
991  *                      buf:            C string containing an unsigned
992  *                                      integer value representing the new
993  *                                      NFSv4 lease expiry time
994  *                      size:           non-zero length of C string in @buf
995  * Output:
996  *      On success:     passed-in buffer filled with '\n'-terminated C
997  *                      string containing unsigned integer value of the
998  *                      current lease expiry time;
999  *                      return code is the size in bytes of the string
1000  *      On error:       return code is zero or a negative errno value
1001  */
1002 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1003 {
1004         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1005         return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1006 }
1007
1008 /*
1009  * write_gracetime - Set or report current NFSv4 grace period time
1010  *
1011  * As above, but sets the time of the NFSv4 grace period.
1012  *
1013  * Note this should never be set to less than the *previous*
1014  * lease-period time, but we don't try to enforce this.  (In the common
1015  * case (a new boot), we don't know what the previous lease time was
1016  * anyway.)
1017  */
1018 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1019 {
1020         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1021         return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1022 }
1023
1024 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1025                                    struct nfsd_net *nn)
1026 {
1027         char *mesg = buf;
1028         char *recdir;
1029         int len, status;
1030
1031         if (size > 0) {
1032                 if (nn->nfsd_serv)
1033                         return -EBUSY;
1034                 if (size > PATH_MAX || buf[size-1] != '\n')
1035                         return -EINVAL;
1036                 buf[size-1] = 0;
1037
1038                 recdir = mesg;
1039                 len = qword_get(&mesg, recdir, size);
1040                 if (len <= 0)
1041                         return -EINVAL;
1042
1043                 status = nfs4_reset_recoverydir(recdir);
1044                 if (status)
1045                         return status;
1046         }
1047
1048         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1049                                                         nfs4_recoverydir());
1050 }
1051
1052 /*
1053  * write_recoverydir - Set or report the pathname of the recovery directory
1054  *
1055  * Input:
1056  *                      buf:            ignored
1057  *                      size:           zero
1058  *
1059  * OR
1060  *
1061  * Input:
1062  *                      buf:            C string containing the pathname
1063  *                                      of the directory on a local file
1064  *                                      system containing permanent NFSv4
1065  *                                      recovery data
1066  *                      size:           non-zero length of C string in @buf
1067  * Output:
1068  *      On success:     passed-in buffer filled with '\n'-terminated C string
1069  *                      containing the current recovery pathname setting;
1070  *                      return code is the size in bytes of the string
1071  *      On error:       return code is zero or a negative errno value
1072  */
1073 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1074 {
1075         ssize_t rv;
1076         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1077
1078         mutex_lock(&nfsd_mutex);
1079         rv = __write_recoverydir(file, buf, size, nn);
1080         mutex_unlock(&nfsd_mutex);
1081         return rv;
1082 }
1083
1084 /*
1085  * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1086  *
1087  * Input:
1088  *                      buf:            ignored
1089  *                      size:           zero
1090  * OR
1091  *
1092  * Input:
1093  *                      buf:            any value
1094  *                      size:           non-zero length of C string in @buf
1095  * Output:
1096  *                      passed-in buffer filled with "Y" or "N" with a newline
1097  *                      and NULL-terminated C string. This indicates whether
1098  *                      the grace period has ended in the current net
1099  *                      namespace. Return code is the size in bytes of the
1100  *                      string. Writing a string that starts with 'Y', 'y', or
1101  *                      '1' to the file will end the grace period for nfsd's v4
1102  *                      lock manager.
1103  */
1104 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1105 {
1106         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1107
1108         if (size > 0) {
1109                 switch(buf[0]) {
1110                 case 'Y':
1111                 case 'y':
1112                 case '1':
1113                         if (!nn->nfsd_serv)
1114                                 return -EBUSY;
1115                         nfsd4_end_grace(nn);
1116                         break;
1117                 default:
1118                         return -EINVAL;
1119                 }
1120         }
1121
1122         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1123                          nn->grace_ended ? 'Y' : 'N');
1124 }
1125
1126 #endif
1127
1128 /*----------------------------------------------------------------------------*/
1129 /*
1130  *      populating the filesystem.
1131  */
1132
1133 /* Basically copying rpc_get_inode. */
1134 static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
1135 {
1136         struct inode *inode = new_inode(sb);
1137         if (!inode)
1138                 return NULL;
1139         /* Following advice from simple_fill_super documentation: */
1140         inode->i_ino = iunique(sb, NFSD_MaxReserved);
1141         inode->i_mode = mode;
1142         inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
1143         switch (mode & S_IFMT) {
1144         case S_IFDIR:
1145                 inode->i_fop = &simple_dir_operations;
1146                 inode->i_op = &simple_dir_inode_operations;
1147                 inc_nlink(inode);
1148                 break;
1149         default:
1150                 break;
1151         }
1152         return inode;
1153 }
1154
1155 static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
1156 {
1157         struct inode *inode;
1158
1159         inode = nfsd_get_inode(dir->i_sb, mode);
1160         if (!inode)
1161                 return -ENOMEM;
1162         if (ncl) {
1163                 inode->i_private = ncl;
1164                 kref_get(&ncl->cl_ref);
1165         }
1166         d_add(dentry, inode);
1167         inc_nlink(dir);
1168         fsnotify_mkdir(dir, dentry);
1169         return 0;
1170 }
1171
1172 static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
1173 {
1174         struct inode *dir = parent->d_inode;
1175         struct dentry *dentry;
1176         int ret = -ENOMEM;
1177
1178         inode_lock(dir);
1179         dentry = d_alloc_name(parent, name);
1180         if (!dentry)
1181                 goto out_err;
1182         ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
1183         if (ret)
1184                 goto out_err;
1185 out:
1186         inode_unlock(dir);
1187         return dentry;
1188 out_err:
1189         dput(dentry);
1190         dentry = ERR_PTR(ret);
1191         goto out;
1192 }
1193
1194 static void clear_ncl(struct inode *inode)
1195 {
1196         struct nfsdfs_client *ncl = inode->i_private;
1197
1198         inode->i_private = NULL;
1199         kref_put(&ncl->cl_ref, ncl->cl_release);
1200 }
1201
1202 static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode)
1203 {
1204         struct nfsdfs_client *nc = inode->i_private;
1205
1206         if (nc)
1207                 kref_get(&nc->cl_ref);
1208         return nc;
1209 }
1210
1211 struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
1212 {
1213         struct nfsdfs_client *nc;
1214
1215         inode_lock_shared(inode);
1216         nc = __get_nfsdfs_client(inode);
1217         inode_unlock_shared(inode);
1218         return nc;
1219 }
1220 /* from __rpc_unlink */
1221 static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry)
1222 {
1223         int ret;
1224
1225         clear_ncl(d_inode(dentry));
1226         dget(dentry);
1227         ret = simple_unlink(dir, dentry);
1228         d_drop(dentry);
1229         fsnotify_unlink(dir, dentry);
1230         dput(dentry);
1231         WARN_ON_ONCE(ret);
1232 }
1233
1234 static void nfsdfs_remove_files(struct dentry *root)
1235 {
1236         struct dentry *dentry, *tmp;
1237
1238         list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) {
1239                 if (!simple_positive(dentry)) {
1240                         WARN_ON_ONCE(1); /* I think this can't happen? */
1241                         continue;
1242                 }
1243                 nfsdfs_remove_file(d_inode(root), dentry);
1244         }
1245 }
1246
1247 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share
1248  * code instead. */
1249 static  int nfsdfs_create_files(struct dentry *root,
1250                                 const struct tree_descr *files,
1251                                 struct dentry **fdentries)
1252 {
1253         struct inode *dir = d_inode(root);
1254         struct inode *inode;
1255         struct dentry *dentry;
1256         int i;
1257
1258         inode_lock(dir);
1259         for (i = 0; files->name && files->name[0]; i++, files++) {
1260                 dentry = d_alloc_name(root, files->name);
1261                 if (!dentry)
1262                         goto out;
1263                 inode = nfsd_get_inode(d_inode(root)->i_sb,
1264                                         S_IFREG | files->mode);
1265                 if (!inode) {
1266                         dput(dentry);
1267                         goto out;
1268                 }
1269                 inode->i_fop = files->ops;
1270                 inode->i_private = __get_nfsdfs_client(dir);
1271                 d_add(dentry, inode);
1272                 fsnotify_create(dir, dentry);
1273                 if (fdentries)
1274                         fdentries[i] = dentry;
1275         }
1276         inode_unlock(dir);
1277         return 0;
1278 out:
1279         nfsdfs_remove_files(root);
1280         inode_unlock(dir);
1281         return -ENOMEM;
1282 }
1283
1284 /* on success, returns positive number unique to that client. */
1285 struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
1286                                  struct nfsdfs_client *ncl, u32 id,
1287                                  const struct tree_descr *files,
1288                                  struct dentry **fdentries)
1289 {
1290         struct dentry *dentry;
1291         char name[11];
1292         int ret;
1293
1294         sprintf(name, "%u", id);
1295
1296         dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
1297         if (IS_ERR(dentry)) /* XXX: tossing errors? */
1298                 return NULL;
1299         ret = nfsdfs_create_files(dentry, files, fdentries);
1300         if (ret) {
1301                 nfsd_client_rmdir(dentry);
1302                 return NULL;
1303         }
1304         return dentry;
1305 }
1306
1307 /* Taken from __rpc_rmdir: */
1308 void nfsd_client_rmdir(struct dentry *dentry)
1309 {
1310         struct inode *dir = d_inode(dentry->d_parent);
1311         struct inode *inode = d_inode(dentry);
1312         int ret;
1313
1314         inode_lock(dir);
1315         nfsdfs_remove_files(dentry);
1316         clear_ncl(inode);
1317         dget(dentry);
1318         ret = simple_rmdir(dir, dentry);
1319         WARN_ON_ONCE(ret);
1320         d_drop(dentry);
1321         fsnotify_rmdir(dir, dentry);
1322         dput(dentry);
1323         inode_unlock(dir);
1324 }
1325
1326 static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
1327 {
1328         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
1329                                                         nfsd_net_id);
1330         struct dentry *dentry;
1331         int ret;
1332
1333         static const struct tree_descr nfsd_files[] = {
1334                 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1335                 /* Per-export io stats use same ops as exports file */
1336                 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO},
1337                 [NFSD_Export_features] = {"export_features",
1338                                         &export_features_fops, S_IRUGO},
1339                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1340                                         &transaction_ops, S_IWUSR|S_IRUSR},
1341                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1342                                         &transaction_ops, S_IWUSR|S_IRUSR},
1343                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1344                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1345                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1346                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1347                 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats",
1348                                         &nfsd_reply_cache_stats_fops, S_IRUGO},
1349                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1350                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1351                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1352                 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1353                 [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO},
1354 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1355                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes",
1356                                         &supported_enctypes_fops, S_IRUGO},
1357 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1358 #ifdef CONFIG_NFSD_V4
1359                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1360                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1361                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1362                 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1363 #endif
1364                 /* last one */ {""}
1365         };
1366
1367         ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1368         if (ret)
1369                 return ret;
1370         dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
1371         if (IS_ERR(dentry))
1372                 return PTR_ERR(dentry);
1373         nn->nfsd_client_dir = dentry;
1374         return 0;
1375 }
1376
1377 static int nfsd_fs_get_tree(struct fs_context *fc)
1378 {
1379         return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
1380 }
1381
1382 static void nfsd_fs_free_fc(struct fs_context *fc)
1383 {
1384         if (fc->s_fs_info)
1385                 put_net(fc->s_fs_info);
1386 }
1387
1388 static const struct fs_context_operations nfsd_fs_context_ops = {
1389         .free           = nfsd_fs_free_fc,
1390         .get_tree       = nfsd_fs_get_tree,
1391 };
1392
1393 static int nfsd_init_fs_context(struct fs_context *fc)
1394 {
1395         put_user_ns(fc->user_ns);
1396         fc->user_ns = get_user_ns(fc->net_ns->user_ns);
1397         fc->ops = &nfsd_fs_context_ops;
1398         return 0;
1399 }
1400
1401 static void nfsd_umount(struct super_block *sb)
1402 {
1403         struct net *net = sb->s_fs_info;
1404
1405         nfsd_shutdown_threads(net);
1406
1407         kill_litter_super(sb);
1408         put_net(net);
1409 }
1410
1411 static struct file_system_type nfsd_fs_type = {
1412         .owner          = THIS_MODULE,
1413         .name           = "nfsd",
1414         .init_fs_context = nfsd_init_fs_context,
1415         .kill_sb        = nfsd_umount,
1416 };
1417 MODULE_ALIAS_FS("nfsd");
1418
1419 #ifdef CONFIG_PROC_FS
1420 static int create_proc_exports_entry(void)
1421 {
1422         struct proc_dir_entry *entry;
1423
1424         entry = proc_mkdir("fs/nfs", NULL);
1425         if (!entry)
1426                 return -ENOMEM;
1427         entry = proc_create("exports", 0, entry, &exports_proc_ops);
1428         if (!entry) {
1429                 remove_proc_entry("fs/nfs", NULL);
1430                 return -ENOMEM;
1431         }
1432         return 0;
1433 }
1434 #else /* CONFIG_PROC_FS */
1435 static int create_proc_exports_entry(void)
1436 {
1437         return 0;
1438 }
1439 #endif
1440
1441 unsigned int nfsd_net_id;
1442
1443 static __net_init int nfsd_init_net(struct net *net)
1444 {
1445         int retval;
1446         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1447
1448         retval = nfsd_export_init(net);
1449         if (retval)
1450                 goto out_export_error;
1451         retval = nfsd_idmap_init(net);
1452         if (retval)
1453                 goto out_idmap_error;
1454         nn->nfsd_versions = NULL;
1455         nn->nfsd4_minorversions = NULL;
1456         retval = nfsd4_init_leases_net(nn);
1457         if (retval)
1458                 goto out_drc_error;
1459         retval = nfsd_reply_cache_init(nn);
1460         if (retval)
1461                 goto out_cache_error;
1462         get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key));
1463         seqlock_init(&nn->writeverf_lock);
1464
1465         return 0;
1466
1467 out_cache_error:
1468         nfsd4_leases_net_shutdown(nn);
1469 out_drc_error:
1470         nfsd_idmap_shutdown(net);
1471 out_idmap_error:
1472         nfsd_export_shutdown(net);
1473 out_export_error:
1474         return retval;
1475 }
1476
1477 static __net_exit void nfsd_exit_net(struct net *net)
1478 {
1479         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1480
1481         nfsd_reply_cache_shutdown(nn);
1482         nfsd_idmap_shutdown(net);
1483         nfsd_export_shutdown(net);
1484         nfsd_netns_free_versions(net_generic(net, nfsd_net_id));
1485         nfsd4_leases_net_shutdown(nn);
1486 }
1487
1488 static struct pernet_operations nfsd_net_ops = {
1489         .init = nfsd_init_net,
1490         .exit = nfsd_exit_net,
1491         .id   = &nfsd_net_id,
1492         .size = sizeof(struct nfsd_net),
1493 };
1494
1495 static int __init init_nfsd(void)
1496 {
1497         int retval;
1498
1499         retval = nfsd4_init_slabs();
1500         if (retval)
1501                 return retval;
1502         retval = nfsd4_init_pnfs();
1503         if (retval)
1504                 goto out_free_slabs;
1505         retval = nfsd_stat_init();      /* Statistics */
1506         if (retval)
1507                 goto out_free_pnfs;
1508         retval = nfsd_drc_slab_create();
1509         if (retval)
1510                 goto out_free_stat;
1511         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1512         retval = create_proc_exports_entry();
1513         if (retval)
1514                 goto out_free_lockd;
1515         retval = register_pernet_subsys(&nfsd_net_ops);
1516         if (retval < 0)
1517                 goto out_free_exports;
1518         retval = register_cld_notifier();
1519         if (retval)
1520                 goto out_free_subsys;
1521         retval = nfsd4_create_laundry_wq();
1522         if (retval)
1523                 goto out_free_cld;
1524         retval = register_filesystem(&nfsd_fs_type);
1525         if (retval)
1526                 goto out_free_all;
1527         return 0;
1528 out_free_all:
1529         nfsd4_destroy_laundry_wq();
1530 out_free_cld:
1531         unregister_cld_notifier();
1532 out_free_subsys:
1533         unregister_pernet_subsys(&nfsd_net_ops);
1534 out_free_exports:
1535         remove_proc_entry("fs/nfs/exports", NULL);
1536         remove_proc_entry("fs/nfs", NULL);
1537 out_free_lockd:
1538         nfsd_lockd_shutdown();
1539         nfsd_drc_slab_free();
1540 out_free_stat:
1541         nfsd_stat_shutdown();
1542 out_free_pnfs:
1543         nfsd4_exit_pnfs();
1544 out_free_slabs:
1545         nfsd4_free_slabs();
1546         return retval;
1547 }
1548
1549 static void __exit exit_nfsd(void)
1550 {
1551         unregister_filesystem(&nfsd_fs_type);
1552         nfsd4_destroy_laundry_wq();
1553         unregister_cld_notifier();
1554         unregister_pernet_subsys(&nfsd_net_ops);
1555         nfsd_drc_slab_free();
1556         remove_proc_entry("fs/nfs/exports", NULL);
1557         remove_proc_entry("fs/nfs", NULL);
1558         nfsd_stat_shutdown();
1559         nfsd_lockd_shutdown();
1560         nfsd4_free_slabs();
1561         nfsd4_exit_pnfs();
1562 }
1563
1564 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1565 MODULE_LICENSE("GPL");
1566 module_init(init_nfsd)
1567 module_exit(exit_nfsd)