Merge tag 'for-6.2/io_uring-2022-12-08' of git://git.kernel.dk/linux
[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 #ifdef CONFIG_NFSD_V2
585                         case 2:
586 #endif
587                         case 3:
588                                 nfsd_vers(nn, num, cmd);
589                                 break;
590                         case 4:
591                                 if (*minorp == '.') {
592                                         if (nfsd_minorversion(nn, minor, cmd) < 0)
593                                                 return -EINVAL;
594                                 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
595                                         /*
596                                          * Either we have +4 and no minors are enabled,
597                                          * or we have -4 and at least one minor is enabled.
598                                          * In either case, propagate 'cmd' to all minors.
599                                          */
600                                         minor = 0;
601                                         while (nfsd_minorversion(nn, minor, cmd) >= 0)
602                                                 minor++;
603                                 }
604                                 break;
605                         default:
606                                 /* Ignore requests to disable non-existent versions */
607                                 if (cmd == NFSD_SET)
608                                         return -EINVAL;
609                         }
610                         vers += len + 1;
611                 } while ((len = qword_get(&mesg, vers, size)) > 0);
612                 /* If all get turned off, turn them back on, as
613                  * having no versions is BAD
614                  */
615                 nfsd_reset_versions(nn);
616         }
617
618         /* Now write current state into reply buffer */
619         sep = "";
620         remaining = SIMPLE_TRANSACTION_LIMIT;
621         for (num=2 ; num <= 4 ; num++) {
622                 int minor;
623                 if (!nfsd_vers(nn, num, NFSD_AVAIL))
624                         continue;
625
626                 minor = -1;
627                 do {
628                         len = nfsd_print_version_support(nn, buf, remaining,
629                                         sep, num, minor);
630                         if (len >= remaining)
631                                 goto out;
632                         remaining -= len;
633                         buf += len;
634                         tlen += len;
635                         minor++;
636                         if (len)
637                                 sep = " ";
638                 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
639         }
640 out:
641         len = snprintf(buf, remaining, "\n");
642         if (len >= remaining)
643                 return -EINVAL;
644         return tlen + len;
645 }
646
647 /*
648  * write_versions - Set or report the available NFS protocol versions
649  *
650  * Input:
651  *                      buf:            ignored
652  *                      size:           zero
653  * Output:
654  *      On success:     passed-in buffer filled with '\n'-terminated C
655  *                      string containing positive or negative integer
656  *                      values representing the current status of each
657  *                      protocol version;
658  *                      return code is the size in bytes of the string
659  *      On error:       return code is zero or a negative errno value
660  *
661  * OR
662  *
663  * Input:
664  *                      buf:            C string containing whitespace-
665  *                                      separated positive or negative
666  *                                      integer values representing NFS
667  *                                      protocol versions to enable ("+n")
668  *                                      or disable ("-n")
669  *                      size:           non-zero length of C string in @buf
670  * Output:
671  *      On success:     status of zero or more protocol versions has
672  *                      been updated; passed-in buffer filled with
673  *                      '\n'-terminated C string containing positive
674  *                      or negative integer values representing the
675  *                      current status of each protocol version;
676  *                      return code is the size in bytes of the string
677  *      On error:       return code is zero or a negative errno value
678  */
679 static ssize_t write_versions(struct file *file, char *buf, size_t size)
680 {
681         ssize_t rv;
682
683         mutex_lock(&nfsd_mutex);
684         rv = __write_versions(file, buf, size);
685         mutex_unlock(&nfsd_mutex);
686         return rv;
687 }
688
689 /*
690  * Zero-length write.  Return a list of NFSD's current listener
691  * transports.
692  */
693 static ssize_t __write_ports_names(char *buf, struct net *net)
694 {
695         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
696
697         if (nn->nfsd_serv == NULL)
698                 return 0;
699         return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
700 }
701
702 /*
703  * A single 'fd' number was written, in which case it must be for
704  * a socket of a supported family/protocol, and we use it as an
705  * nfsd listener.
706  */
707 static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
708 {
709         char *mesg = buf;
710         int fd, err;
711         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
712
713         err = get_int(&mesg, &fd);
714         if (err != 0 || fd < 0)
715                 return -EINVAL;
716
717         if (svc_alien_sock(net, fd)) {
718                 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
719                 return -EINVAL;
720         }
721
722         err = nfsd_create_serv(net);
723         if (err != 0)
724                 return err;
725
726         err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
727
728         if (err >= 0 &&
729             !nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1))
730                 svc_get(nn->nfsd_serv);
731
732         nfsd_put(net);
733         return err;
734 }
735
736 /*
737  * A transport listener is added by writing it's transport name and
738  * a port number.
739  */
740 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
741 {
742         char transport[16];
743         struct svc_xprt *xprt;
744         int port, err;
745         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
746
747         if (sscanf(buf, "%15s %5u", transport, &port) != 2)
748                 return -EINVAL;
749
750         if (port < 1 || port > USHRT_MAX)
751                 return -EINVAL;
752
753         err = nfsd_create_serv(net);
754         if (err != 0)
755                 return err;
756
757         err = svc_xprt_create(nn->nfsd_serv, transport, net,
758                               PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
759         if (err < 0)
760                 goto out_err;
761
762         err = svc_xprt_create(nn->nfsd_serv, transport, net,
763                               PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
764         if (err < 0 && err != -EAFNOSUPPORT)
765                 goto out_close;
766
767         if (!nn->nfsd_serv->sv_nrthreads && !xchg(&nn->keep_active, 1))
768                 svc_get(nn->nfsd_serv);
769
770         nfsd_put(net);
771         return 0;
772 out_close:
773         xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
774         if (xprt != NULL) {
775                 svc_xprt_close(xprt);
776                 svc_xprt_put(xprt);
777         }
778 out_err:
779         nfsd_put(net);
780         return err;
781 }
782
783 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
784                              struct net *net)
785 {
786         if (size == 0)
787                 return __write_ports_names(buf, net);
788
789         if (isdigit(buf[0]))
790                 return __write_ports_addfd(buf, net, file->f_cred);
791
792         if (isalpha(buf[0]))
793                 return __write_ports_addxprt(buf, net, file->f_cred);
794
795         return -EINVAL;
796 }
797
798 /*
799  * write_ports - Pass a socket file descriptor or transport name to listen on
800  *
801  * Input:
802  *                      buf:            ignored
803  *                      size:           zero
804  * Output:
805  *      On success:     passed-in buffer filled with a '\n'-terminated C
806  *                      string containing a whitespace-separated list of
807  *                      named NFSD listeners;
808  *                      return code is the size in bytes of the string
809  *      On error:       return code is zero or a negative errno value
810  *
811  * OR
812  *
813  * Input:
814  *                      buf:            C string containing an unsigned
815  *                                      integer value representing a bound
816  *                                      but unconnected socket that is to be
817  *                                      used as an NFSD listener; listen(3)
818  *                                      must be called for a SOCK_STREAM
819  *                                      socket, otherwise it is ignored
820  *                      size:           non-zero length of C string in @buf
821  * Output:
822  *      On success:     NFS service is started;
823  *                      passed-in buffer filled with a '\n'-terminated C
824  *                      string containing a unique alphanumeric name of
825  *                      the listener;
826  *                      return code is the size in bytes of the string
827  *      On error:       return code is a negative errno value
828  *
829  * OR
830  *
831  * Input:
832  *                      buf:            C string containing a transport
833  *                                      name and an unsigned integer value
834  *                                      representing the port to listen on,
835  *                                      separated by whitespace
836  *                      size:           non-zero length of C string in @buf
837  * Output:
838  *      On success:     returns zero; NFS service is started
839  *      On error:       return code is a negative errno value
840  */
841 static ssize_t write_ports(struct file *file, char *buf, size_t size)
842 {
843         ssize_t rv;
844
845         mutex_lock(&nfsd_mutex);
846         rv = __write_ports(file, buf, size, netns(file));
847         mutex_unlock(&nfsd_mutex);
848         return rv;
849 }
850
851
852 int nfsd_max_blksize;
853
854 /*
855  * write_maxblksize - Set or report the current NFS blksize
856  *
857  * Input:
858  *                      buf:            ignored
859  *                      size:           zero
860  *
861  * OR
862  *
863  * Input:
864  *                      buf:            C string containing an unsigned
865  *                                      integer value representing the new
866  *                                      NFS blksize
867  *                      size:           non-zero length of C string in @buf
868  * Output:
869  *      On success:     passed-in buffer filled with '\n'-terminated C string
870  *                      containing numeric value of the current NFS blksize
871  *                      setting;
872  *                      return code is the size in bytes of the string
873  *      On error:       return code is zero or a negative errno value
874  */
875 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
876 {
877         char *mesg = buf;
878         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
879
880         if (size > 0) {
881                 int bsize;
882                 int rv = get_int(&mesg, &bsize);
883                 if (rv)
884                         return rv;
885                 /* force bsize into allowed range and
886                  * required alignment.
887                  */
888                 bsize = max_t(int, bsize, 1024);
889                 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
890                 bsize &= ~(1024-1);
891                 mutex_lock(&nfsd_mutex);
892                 if (nn->nfsd_serv) {
893                         mutex_unlock(&nfsd_mutex);
894                         return -EBUSY;
895                 }
896                 nfsd_max_blksize = bsize;
897                 mutex_unlock(&nfsd_mutex);
898         }
899
900         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
901                                                         nfsd_max_blksize);
902 }
903
904 /*
905  * write_maxconn - Set or report the current max number of connections
906  *
907  * Input:
908  *                      buf:            ignored
909  *                      size:           zero
910  * OR
911  *
912  * Input:
913  *                      buf:            C string containing an unsigned
914  *                                      integer value representing the new
915  *                                      number of max connections
916  *                      size:           non-zero length of C string in @buf
917  * Output:
918  *      On success:     passed-in buffer filled with '\n'-terminated C string
919  *                      containing numeric value of max_connections setting
920  *                      for this net namespace;
921  *                      return code is the size in bytes of the string
922  *      On error:       return code is zero or a negative errno value
923  */
924 static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
925 {
926         char *mesg = buf;
927         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
928         unsigned int maxconn = nn->max_connections;
929
930         if (size > 0) {
931                 int rv = get_uint(&mesg, &maxconn);
932
933                 if (rv)
934                         return rv;
935                 nn->max_connections = maxconn;
936         }
937
938         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
939 }
940
941 #ifdef CONFIG_NFSD_V4
942 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
943                                   time64_t *time, struct nfsd_net *nn)
944 {
945         char *mesg = buf;
946         int rv, i;
947
948         if (size > 0) {
949                 if (nn->nfsd_serv)
950                         return -EBUSY;
951                 rv = get_int(&mesg, &i);
952                 if (rv)
953                         return rv;
954                 /*
955                  * Some sanity checking.  We don't have a reason for
956                  * these particular numbers, but problems with the
957                  * extremes are:
958                  *      - Too short: the briefest network outage may
959                  *        cause clients to lose all their locks.  Also,
960                  *        the frequent polling may be wasteful.
961                  *      - Too long: do you really want reboot recovery
962                  *        to take more than an hour?  Or to make other
963                  *        clients wait an hour before being able to
964                  *        revoke a dead client's locks?
965                  */
966                 if (i < 10 || i > 3600)
967                         return -EINVAL;
968                 *time = i;
969         }
970
971         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time);
972 }
973
974 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
975                                 time64_t *time, struct nfsd_net *nn)
976 {
977         ssize_t rv;
978
979         mutex_lock(&nfsd_mutex);
980         rv = __nfsd4_write_time(file, buf, size, time, nn);
981         mutex_unlock(&nfsd_mutex);
982         return rv;
983 }
984
985 /*
986  * write_leasetime - Set or report the current NFSv4 lease time
987  *
988  * Input:
989  *                      buf:            ignored
990  *                      size:           zero
991  *
992  * OR
993  *
994  * Input:
995  *                      buf:            C string containing an unsigned
996  *                                      integer value representing the new
997  *                                      NFSv4 lease expiry time
998  *                      size:           non-zero length of C string in @buf
999  * Output:
1000  *      On success:     passed-in buffer filled with '\n'-terminated C
1001  *                      string containing unsigned integer value of the
1002  *                      current lease expiry time;
1003  *                      return code is the size in bytes of the string
1004  *      On error:       return code is zero or a negative errno value
1005  */
1006 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1007 {
1008         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1009         return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1010 }
1011
1012 /*
1013  * write_gracetime - Set or report current NFSv4 grace period time
1014  *
1015  * As above, but sets the time of the NFSv4 grace period.
1016  *
1017  * Note this should never be set to less than the *previous*
1018  * lease-period time, but we don't try to enforce this.  (In the common
1019  * case (a new boot), we don't know what the previous lease time was
1020  * anyway.)
1021  */
1022 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1023 {
1024         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1025         return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1026 }
1027
1028 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1029                                    struct nfsd_net *nn)
1030 {
1031         char *mesg = buf;
1032         char *recdir;
1033         int len, status;
1034
1035         if (size > 0) {
1036                 if (nn->nfsd_serv)
1037                         return -EBUSY;
1038                 if (size > PATH_MAX || buf[size-1] != '\n')
1039                         return -EINVAL;
1040                 buf[size-1] = 0;
1041
1042                 recdir = mesg;
1043                 len = qword_get(&mesg, recdir, size);
1044                 if (len <= 0)
1045                         return -EINVAL;
1046
1047                 status = nfs4_reset_recoverydir(recdir);
1048                 if (status)
1049                         return status;
1050         }
1051
1052         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1053                                                         nfs4_recoverydir());
1054 }
1055
1056 /*
1057  * write_recoverydir - Set or report the pathname of the recovery directory
1058  *
1059  * Input:
1060  *                      buf:            ignored
1061  *                      size:           zero
1062  *
1063  * OR
1064  *
1065  * Input:
1066  *                      buf:            C string containing the pathname
1067  *                                      of the directory on a local file
1068  *                                      system containing permanent NFSv4
1069  *                                      recovery data
1070  *                      size:           non-zero length of C string in @buf
1071  * Output:
1072  *      On success:     passed-in buffer filled with '\n'-terminated C string
1073  *                      containing the current recovery pathname setting;
1074  *                      return code is the size in bytes of the string
1075  *      On error:       return code is zero or a negative errno value
1076  */
1077 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1078 {
1079         ssize_t rv;
1080         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1081
1082         mutex_lock(&nfsd_mutex);
1083         rv = __write_recoverydir(file, buf, size, nn);
1084         mutex_unlock(&nfsd_mutex);
1085         return rv;
1086 }
1087
1088 /*
1089  * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1090  *
1091  * Input:
1092  *                      buf:            ignored
1093  *                      size:           zero
1094  * OR
1095  *
1096  * Input:
1097  *                      buf:            any value
1098  *                      size:           non-zero length of C string in @buf
1099  * Output:
1100  *                      passed-in buffer filled with "Y" or "N" with a newline
1101  *                      and NULL-terminated C string. This indicates whether
1102  *                      the grace period has ended in the current net
1103  *                      namespace. Return code is the size in bytes of the
1104  *                      string. Writing a string that starts with 'Y', 'y', or
1105  *                      '1' to the file will end the grace period for nfsd's v4
1106  *                      lock manager.
1107  */
1108 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1109 {
1110         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1111
1112         if (size > 0) {
1113                 switch(buf[0]) {
1114                 case 'Y':
1115                 case 'y':
1116                 case '1':
1117                         if (!nn->nfsd_serv)
1118                                 return -EBUSY;
1119                         nfsd4_end_grace(nn);
1120                         break;
1121                 default:
1122                         return -EINVAL;
1123                 }
1124         }
1125
1126         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1127                          nn->grace_ended ? 'Y' : 'N');
1128 }
1129
1130 #endif
1131
1132 /*----------------------------------------------------------------------------*/
1133 /*
1134  *      populating the filesystem.
1135  */
1136
1137 /* Basically copying rpc_get_inode. */
1138 static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
1139 {
1140         struct inode *inode = new_inode(sb);
1141         if (!inode)
1142                 return NULL;
1143         /* Following advice from simple_fill_super documentation: */
1144         inode->i_ino = iunique(sb, NFSD_MaxReserved);
1145         inode->i_mode = mode;
1146         inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
1147         switch (mode & S_IFMT) {
1148         case S_IFDIR:
1149                 inode->i_fop = &simple_dir_operations;
1150                 inode->i_op = &simple_dir_inode_operations;
1151                 inc_nlink(inode);
1152                 break;
1153         default:
1154                 break;
1155         }
1156         return inode;
1157 }
1158
1159 static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
1160 {
1161         struct inode *inode;
1162
1163         inode = nfsd_get_inode(dir->i_sb, mode);
1164         if (!inode)
1165                 return -ENOMEM;
1166         if (ncl) {
1167                 inode->i_private = ncl;
1168                 kref_get(&ncl->cl_ref);
1169         }
1170         d_add(dentry, inode);
1171         inc_nlink(dir);
1172         fsnotify_mkdir(dir, dentry);
1173         return 0;
1174 }
1175
1176 static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
1177 {
1178         struct inode *dir = parent->d_inode;
1179         struct dentry *dentry;
1180         int ret = -ENOMEM;
1181
1182         inode_lock(dir);
1183         dentry = d_alloc_name(parent, name);
1184         if (!dentry)
1185                 goto out_err;
1186         ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
1187         if (ret)
1188                 goto out_err;
1189 out:
1190         inode_unlock(dir);
1191         return dentry;
1192 out_err:
1193         dput(dentry);
1194         dentry = ERR_PTR(ret);
1195         goto out;
1196 }
1197
1198 static void clear_ncl(struct inode *inode)
1199 {
1200         struct nfsdfs_client *ncl = inode->i_private;
1201
1202         inode->i_private = NULL;
1203         kref_put(&ncl->cl_ref, ncl->cl_release);
1204 }
1205
1206 static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode)
1207 {
1208         struct nfsdfs_client *nc = inode->i_private;
1209
1210         if (nc)
1211                 kref_get(&nc->cl_ref);
1212         return nc;
1213 }
1214
1215 struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
1216 {
1217         struct nfsdfs_client *nc;
1218
1219         inode_lock_shared(inode);
1220         nc = __get_nfsdfs_client(inode);
1221         inode_unlock_shared(inode);
1222         return nc;
1223 }
1224 /* from __rpc_unlink */
1225 static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry)
1226 {
1227         int ret;
1228
1229         clear_ncl(d_inode(dentry));
1230         dget(dentry);
1231         ret = simple_unlink(dir, dentry);
1232         d_drop(dentry);
1233         fsnotify_unlink(dir, dentry);
1234         dput(dentry);
1235         WARN_ON_ONCE(ret);
1236 }
1237
1238 static void nfsdfs_remove_files(struct dentry *root)
1239 {
1240         struct dentry *dentry, *tmp;
1241
1242         list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) {
1243                 if (!simple_positive(dentry)) {
1244                         WARN_ON_ONCE(1); /* I think this can't happen? */
1245                         continue;
1246                 }
1247                 nfsdfs_remove_file(d_inode(root), dentry);
1248         }
1249 }
1250
1251 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share
1252  * code instead. */
1253 static  int nfsdfs_create_files(struct dentry *root,
1254                                 const struct tree_descr *files,
1255                                 struct dentry **fdentries)
1256 {
1257         struct inode *dir = d_inode(root);
1258         struct inode *inode;
1259         struct dentry *dentry;
1260         int i;
1261
1262         inode_lock(dir);
1263         for (i = 0; files->name && files->name[0]; i++, files++) {
1264                 dentry = d_alloc_name(root, files->name);
1265                 if (!dentry)
1266                         goto out;
1267                 inode = nfsd_get_inode(d_inode(root)->i_sb,
1268                                         S_IFREG | files->mode);
1269                 if (!inode) {
1270                         dput(dentry);
1271                         goto out;
1272                 }
1273                 inode->i_fop = files->ops;
1274                 inode->i_private = __get_nfsdfs_client(dir);
1275                 d_add(dentry, inode);
1276                 fsnotify_create(dir, dentry);
1277                 if (fdentries)
1278                         fdentries[i] = dentry;
1279         }
1280         inode_unlock(dir);
1281         return 0;
1282 out:
1283         nfsdfs_remove_files(root);
1284         inode_unlock(dir);
1285         return -ENOMEM;
1286 }
1287
1288 /* on success, returns positive number unique to that client. */
1289 struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
1290                                  struct nfsdfs_client *ncl, u32 id,
1291                                  const struct tree_descr *files,
1292                                  struct dentry **fdentries)
1293 {
1294         struct dentry *dentry;
1295         char name[11];
1296         int ret;
1297
1298         sprintf(name, "%u", id);
1299
1300         dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
1301         if (IS_ERR(dentry)) /* XXX: tossing errors? */
1302                 return NULL;
1303         ret = nfsdfs_create_files(dentry, files, fdentries);
1304         if (ret) {
1305                 nfsd_client_rmdir(dentry);
1306                 return NULL;
1307         }
1308         return dentry;
1309 }
1310
1311 /* Taken from __rpc_rmdir: */
1312 void nfsd_client_rmdir(struct dentry *dentry)
1313 {
1314         struct inode *dir = d_inode(dentry->d_parent);
1315         struct inode *inode = d_inode(dentry);
1316         int ret;
1317
1318         inode_lock(dir);
1319         nfsdfs_remove_files(dentry);
1320         clear_ncl(inode);
1321         dget(dentry);
1322         ret = simple_rmdir(dir, dentry);
1323         WARN_ON_ONCE(ret);
1324         d_drop(dentry);
1325         fsnotify_rmdir(dir, dentry);
1326         dput(dentry);
1327         inode_unlock(dir);
1328 }
1329
1330 static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
1331 {
1332         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
1333                                                         nfsd_net_id);
1334         struct dentry *dentry;
1335         int ret;
1336
1337         static const struct tree_descr nfsd_files[] = {
1338                 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1339                 /* Per-export io stats use same ops as exports file */
1340                 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO},
1341                 [NFSD_Export_features] = {"export_features",
1342                                         &export_features_fops, S_IRUGO},
1343                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1344                                         &transaction_ops, S_IWUSR|S_IRUSR},
1345                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1346                                         &transaction_ops, S_IWUSR|S_IRUSR},
1347                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1348                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1349                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1350                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1351                 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats",
1352                                         &nfsd_reply_cache_stats_fops, S_IRUGO},
1353                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1354                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1355                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1356                 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1357                 [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO},
1358 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1359                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes",
1360                                         &supported_enctypes_fops, S_IRUGO},
1361 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1362 #ifdef CONFIG_NFSD_V4
1363                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1364                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1365                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1366                 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1367 #endif
1368                 /* last one */ {""}
1369         };
1370
1371         ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1372         if (ret)
1373                 return ret;
1374         dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
1375         if (IS_ERR(dentry))
1376                 return PTR_ERR(dentry);
1377         nn->nfsd_client_dir = dentry;
1378         return 0;
1379 }
1380
1381 static int nfsd_fs_get_tree(struct fs_context *fc)
1382 {
1383         return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
1384 }
1385
1386 static void nfsd_fs_free_fc(struct fs_context *fc)
1387 {
1388         if (fc->s_fs_info)
1389                 put_net(fc->s_fs_info);
1390 }
1391
1392 static const struct fs_context_operations nfsd_fs_context_ops = {
1393         .free           = nfsd_fs_free_fc,
1394         .get_tree       = nfsd_fs_get_tree,
1395 };
1396
1397 static int nfsd_init_fs_context(struct fs_context *fc)
1398 {
1399         put_user_ns(fc->user_ns);
1400         fc->user_ns = get_user_ns(fc->net_ns->user_ns);
1401         fc->ops = &nfsd_fs_context_ops;
1402         return 0;
1403 }
1404
1405 static void nfsd_umount(struct super_block *sb)
1406 {
1407         struct net *net = sb->s_fs_info;
1408
1409         nfsd_shutdown_threads(net);
1410
1411         kill_litter_super(sb);
1412         put_net(net);
1413 }
1414
1415 static struct file_system_type nfsd_fs_type = {
1416         .owner          = THIS_MODULE,
1417         .name           = "nfsd",
1418         .init_fs_context = nfsd_init_fs_context,
1419         .kill_sb        = nfsd_umount,
1420 };
1421 MODULE_ALIAS_FS("nfsd");
1422
1423 #ifdef CONFIG_PROC_FS
1424 static int create_proc_exports_entry(void)
1425 {
1426         struct proc_dir_entry *entry;
1427
1428         entry = proc_mkdir("fs/nfs", NULL);
1429         if (!entry)
1430                 return -ENOMEM;
1431         entry = proc_create("exports", 0, entry, &exports_proc_ops);
1432         if (!entry) {
1433                 remove_proc_entry("fs/nfs", NULL);
1434                 return -ENOMEM;
1435         }
1436         return 0;
1437 }
1438 #else /* CONFIG_PROC_FS */
1439 static int create_proc_exports_entry(void)
1440 {
1441         return 0;
1442 }
1443 #endif
1444
1445 unsigned int nfsd_net_id;
1446
1447 static __net_init int nfsd_init_net(struct net *net)
1448 {
1449         int retval;
1450         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1451
1452         retval = nfsd_export_init(net);
1453         if (retval)
1454                 goto out_export_error;
1455         retval = nfsd_idmap_init(net);
1456         if (retval)
1457                 goto out_idmap_error;
1458         nn->nfsd_versions = NULL;
1459         nn->nfsd4_minorversions = NULL;
1460         retval = nfsd4_init_leases_net(nn);
1461         if (retval)
1462                 goto out_drc_error;
1463         retval = nfsd_reply_cache_init(nn);
1464         if (retval)
1465                 goto out_cache_error;
1466         get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key));
1467         seqlock_init(&nn->writeverf_lock);
1468
1469         return 0;
1470
1471 out_cache_error:
1472         nfsd4_leases_net_shutdown(nn);
1473 out_drc_error:
1474         nfsd_idmap_shutdown(net);
1475 out_idmap_error:
1476         nfsd_export_shutdown(net);
1477 out_export_error:
1478         return retval;
1479 }
1480
1481 static __net_exit void nfsd_exit_net(struct net *net)
1482 {
1483         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1484
1485         nfsd_reply_cache_shutdown(nn);
1486         nfsd_idmap_shutdown(net);
1487         nfsd_export_shutdown(net);
1488         nfsd_netns_free_versions(net_generic(net, nfsd_net_id));
1489         nfsd4_leases_net_shutdown(nn);
1490 }
1491
1492 static struct pernet_operations nfsd_net_ops = {
1493         .init = nfsd_init_net,
1494         .exit = nfsd_exit_net,
1495         .id   = &nfsd_net_id,
1496         .size = sizeof(struct nfsd_net),
1497 };
1498
1499 static int __init init_nfsd(void)
1500 {
1501         int retval;
1502
1503         retval = nfsd4_init_slabs();
1504         if (retval)
1505                 return retval;
1506         retval = nfsd4_init_pnfs();
1507         if (retval)
1508                 goto out_free_slabs;
1509         retval = nfsd_stat_init();      /* Statistics */
1510         if (retval)
1511                 goto out_free_pnfs;
1512         retval = nfsd_drc_slab_create();
1513         if (retval)
1514                 goto out_free_stat;
1515         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1516         retval = create_proc_exports_entry();
1517         if (retval)
1518                 goto out_free_lockd;
1519         retval = register_pernet_subsys(&nfsd_net_ops);
1520         if (retval < 0)
1521                 goto out_free_exports;
1522         retval = register_cld_notifier();
1523         if (retval)
1524                 goto out_free_subsys;
1525         retval = nfsd4_create_laundry_wq();
1526         if (retval)
1527                 goto out_free_cld;
1528         retval = register_filesystem(&nfsd_fs_type);
1529         if (retval)
1530                 goto out_free_all;
1531         return 0;
1532 out_free_all:
1533         nfsd4_destroy_laundry_wq();
1534 out_free_cld:
1535         unregister_cld_notifier();
1536 out_free_subsys:
1537         unregister_pernet_subsys(&nfsd_net_ops);
1538 out_free_exports:
1539         remove_proc_entry("fs/nfs/exports", NULL);
1540         remove_proc_entry("fs/nfs", NULL);
1541 out_free_lockd:
1542         nfsd_lockd_shutdown();
1543         nfsd_drc_slab_free();
1544 out_free_stat:
1545         nfsd_stat_shutdown();
1546 out_free_pnfs:
1547         nfsd4_exit_pnfs();
1548 out_free_slabs:
1549         nfsd4_free_slabs();
1550         return retval;
1551 }
1552
1553 static void __exit exit_nfsd(void)
1554 {
1555         unregister_filesystem(&nfsd_fs_type);
1556         nfsd4_destroy_laundry_wq();
1557         unregister_cld_notifier();
1558         unregister_pernet_subsys(&nfsd_net_ops);
1559         nfsd_drc_slab_free();
1560         remove_proc_entry("fs/nfs/exports", NULL);
1561         remove_proc_entry("fs/nfs", NULL);
1562         nfsd_stat_shutdown();
1563         nfsd_lockd_shutdown();
1564         nfsd4_free_slabs();
1565         nfsd4_exit_pnfs();
1566 }
1567
1568 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1569 MODULE_LICENSE("GPL");
1570 module_init(init_nfsd)
1571 module_exit(exit_nfsd)