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Linux/fs/nfsd/nfsctl.c

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  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 
 29 /*
 30  *      We have a single directory with several nodes in it.
 31  */
 32 enum {
 33         NFSD_Root = 1,
 34         NFSD_List,
 35         NFSD_Export_features,
 36         NFSD_Fh,
 37         NFSD_FO_UnlockIP,
 38         NFSD_FO_UnlockFS,
 39         NFSD_Threads,
 40         NFSD_Pool_Threads,
 41         NFSD_Pool_Stats,
 42         NFSD_Reply_Cache_Stats,
 43         NFSD_Versions,
 44         NFSD_Ports,
 45         NFSD_MaxBlkSize,
 46         NFSD_MaxConnections,
 47         NFSD_SupportedEnctypes,
 48         /*
 49          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
 50          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
 51          */
 52 #ifdef CONFIG_NFSD_V4
 53         NFSD_Leasetime,
 54         NFSD_Gracetime,
 55         NFSD_RecoveryDir,
 56         NFSD_V4EndGrace,
 57 #endif
 58         NFSD_MaxReserved
 59 };
 60 
 61 /*
 62  * write() for these nodes.
 63  */
 64 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
 65 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
 66 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
 67 static ssize_t write_threads(struct file *file, char *buf, size_t size);
 68 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
 69 static ssize_t write_versions(struct file *file, char *buf, size_t size);
 70 static ssize_t write_ports(struct file *file, char *buf, size_t size);
 71 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
 72 static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
 73 #ifdef CONFIG_NFSD_V4
 74 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
 75 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
 76 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
 77 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
 78 #endif
 79 
 80 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
 81         [NFSD_Fh] = write_filehandle,
 82         [NFSD_FO_UnlockIP] = write_unlock_ip,
 83         [NFSD_FO_UnlockFS] = write_unlock_fs,
 84         [NFSD_Threads] = write_threads,
 85         [NFSD_Pool_Threads] = write_pool_threads,
 86         [NFSD_Versions] = write_versions,
 87         [NFSD_Ports] = write_ports,
 88         [NFSD_MaxBlkSize] = write_maxblksize,
 89         [NFSD_MaxConnections] = write_maxconn,
 90 #ifdef CONFIG_NFSD_V4
 91         [NFSD_Leasetime] = write_leasetime,
 92         [NFSD_Gracetime] = write_gracetime,
 93         [NFSD_RecoveryDir] = write_recoverydir,
 94         [NFSD_V4EndGrace] = write_v4_end_grace,
 95 #endif
 96 };
 97 
 98 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 99 {
100         ino_t ino =  file_inode(file)->i_ino;
101         char *data;
102         ssize_t rv;
103 
104         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
105                 return -EINVAL;
106 
107         data = simple_transaction_get(file, buf, size);
108         if (IS_ERR(data))
109                 return PTR_ERR(data);
110 
111         rv =  write_op[ino](file, data, size);
112         if (rv >= 0) {
113                 simple_transaction_set(file, rv);
114                 rv = size;
115         }
116         return rv;
117 }
118 
119 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
120 {
121         if (! file->private_data) {
122                 /* An attempt to read a transaction file without writing
123                  * causes a 0-byte write so that the file can return
124                  * state information
125                  */
126                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
127                 if (rv < 0)
128                         return rv;
129         }
130         return simple_transaction_read(file, buf, size, pos);
131 }
132 
133 static const struct file_operations transaction_ops = {
134         .write          = nfsctl_transaction_write,
135         .read           = nfsctl_transaction_read,
136         .release        = simple_transaction_release,
137         .llseek         = default_llseek,
138 };
139 
140 static int exports_net_open(struct net *net, struct file *file)
141 {
142         int err;
143         struct seq_file *seq;
144         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
145 
146         err = seq_open(file, &nfs_exports_op);
147         if (err)
148                 return err;
149 
150         seq = file->private_data;
151         seq->private = nn->svc_export_cache;
152         return 0;
153 }
154 
155 static int exports_proc_open(struct inode *inode, struct file *file)
156 {
157         return exports_net_open(current->nsproxy->net_ns, file);
158 }
159 
160 static const struct proc_ops exports_proc_ops = {
161         .proc_open      = exports_proc_open,
162         .proc_read      = seq_read,
163         .proc_lseek     = seq_lseek,
164         .proc_release   = seq_release,
165 };
166 
167 static int exports_nfsd_open(struct inode *inode, struct file *file)
168 {
169         return exports_net_open(inode->i_sb->s_fs_info, file);
170 }
171 
172 static const struct file_operations exports_nfsd_operations = {
173         .open           = exports_nfsd_open,
174         .read           = seq_read,
175         .llseek         = seq_lseek,
176         .release        = seq_release,
177 };
178 
179 static int export_features_show(struct seq_file *m, void *v)
180 {
181         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
182         return 0;
183 }
184 
185 static int export_features_open(struct inode *inode, struct file *file)
186 {
187         return single_open(file, export_features_show, NULL);
188 }
189 
190 static const struct file_operations export_features_operations = {
191         .open           = export_features_open,
192         .read           = seq_read,
193         .llseek         = seq_lseek,
194         .release        = single_release,
195 };
196 
197 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
198 static int supported_enctypes_show(struct seq_file *m, void *v)
199 {
200         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
201         return 0;
202 }
203 
204 static int supported_enctypes_open(struct inode *inode, struct file *file)
205 {
206         return single_open(file, supported_enctypes_show, NULL);
207 }
208 
209 static const struct file_operations supported_enctypes_ops = {
210         .open           = supported_enctypes_open,
211         .read           = seq_read,
212         .llseek         = seq_lseek,
213         .release        = single_release,
214 };
215 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
216 
217 static const struct file_operations pool_stats_operations = {
218         .open           = nfsd_pool_stats_open,
219         .read           = seq_read,
220         .llseek         = seq_lseek,
221         .release        = nfsd_pool_stats_release,
222 };
223 
224 static const struct file_operations reply_cache_stats_operations = {
225         .open           = nfsd_reply_cache_stats_open,
226         .read           = seq_read,
227         .llseek         = seq_lseek,
228         .release        = single_release,
229 };
230 
231 /*----------------------------------------------------------------------------*/
232 /*
233  * payload - write methods
234  */
235 
236 static inline struct net *netns(struct file *file)
237 {
238         return file_inode(file)->i_sb->s_fs_info;
239 }
240 
241 /*
242  * write_unlock_ip - Release all locks used by a client
243  *
244  * Experimental.
245  *
246  * Input:
247  *                      buf:    '\n'-terminated C string containing a
248  *                              presentation format IP address
249  *                      size:   length of C string in @buf
250  * Output:
251  *      On success:     returns zero if all specified locks were released;
252  *                      returns one if one or more locks were not released
253  *      On error:       return code is negative errno value
254  */
255 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
256 {
257         struct sockaddr_storage address;
258         struct sockaddr *sap = (struct sockaddr *)&address;
259         size_t salen = sizeof(address);
260         char *fo_path;
261         struct net *net = netns(file);
262 
263         /* sanity check */
264         if (size == 0)
265                 return -EINVAL;
266 
267         if (buf[size-1] != '\n')
268                 return -EINVAL;
269 
270         fo_path = buf;
271         if (qword_get(&buf, fo_path, size) < 0)
272                 return -EINVAL;
273 
274         if (rpc_pton(net, fo_path, size, sap, salen) == 0)
275                 return -EINVAL;
276 
277         return nlmsvc_unlock_all_by_ip(sap);
278 }
279 
280 /*
281  * write_unlock_fs - Release all locks on a local file system
282  *
283  * Experimental.
284  *
285  * Input:
286  *                      buf:    '\n'-terminated C string containing the
287  *                              absolute pathname of a local file system
288  *                      size:   length of C string in @buf
289  * Output:
290  *      On success:     returns zero if all specified locks were released;
291  *                      returns one if one or more locks were not released
292  *      On error:       return code is negative errno value
293  */
294 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
295 {
296         struct path path;
297         char *fo_path;
298         int error;
299 
300         /* sanity check */
301         if (size == 0)
302                 return -EINVAL;
303 
304         if (buf[size-1] != '\n')
305                 return -EINVAL;
306 
307         fo_path = buf;
308         if (qword_get(&buf, fo_path, size) < 0)
309                 return -EINVAL;
310 
311         error = kern_path(fo_path, 0, &path);
312         if (error)
313                 return error;
314 
315         /*
316          * XXX: Needs better sanity checking.  Otherwise we could end up
317          * releasing locks on the wrong file system.
318          *
319          * For example:
320          * 1.  Does the path refer to a directory?
321          * 2.  Is that directory a mount point, or
322          * 3.  Is that directory the root of an exported file system?
323          */
324         error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
325 
326         path_put(&path);
327         return error;
328 }
329 
330 /*
331  * write_filehandle - Get a variable-length NFS file handle by path
332  *
333  * On input, the buffer contains a '\n'-terminated C string comprised of
334  * three alphanumeric words separated by whitespace.  The string may
335  * contain escape sequences.
336  *
337  * Input:
338  *                      buf:
339  *                              domain:         client domain name
340  *                              path:           export pathname
341  *                              maxsize:        numeric maximum size of
342  *                                              @buf
343  *                      size:   length of C string in @buf
344  * Output:
345  *      On success:     passed-in buffer filled with '\n'-terminated C
346  *                      string containing a ASCII hex text version
347  *                      of the NFS file handle;
348  *                      return code is the size in bytes of the string
349  *      On error:       return code is negative errno value
350  */
351 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
352 {
353         char *dname, *path;
354         int maxsize;
355         char *mesg = buf;
356         int len;
357         struct auth_domain *dom;
358         struct knfsd_fh fh;
359 
360         if (size == 0)
361                 return -EINVAL;
362 
363         if (buf[size-1] != '\n')
364                 return -EINVAL;
365         buf[size-1] = 0;
366 
367         dname = mesg;
368         len = qword_get(&mesg, dname, size);
369         if (len <= 0)
370                 return -EINVAL;
371         
372         path = dname+len+1;
373         len = qword_get(&mesg, path, size);
374         if (len <= 0)
375                 return -EINVAL;
376 
377         len = get_int(&mesg, &maxsize);
378         if (len)
379                 return len;
380 
381         if (maxsize < NFS_FHSIZE)
382                 return -EINVAL;
383         maxsize = min(maxsize, NFS3_FHSIZE);
384 
385         if (qword_get(&mesg, mesg, size)>0)
386                 return -EINVAL;
387 
388         /* we have all the words, they are in buf.. */
389         dom = unix_domain_find(dname);
390         if (!dom)
391                 return -ENOMEM;
392 
393         len = exp_rootfh(netns(file), dom, path, &fh,  maxsize);
394         auth_domain_put(dom);
395         if (len)
396                 return len;
397         
398         mesg = buf;
399         len = SIMPLE_TRANSACTION_LIMIT;
400         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
401         mesg[-1] = '\n';
402         return mesg - buf;      
403 }
404 
405 /*
406  * write_threads - Start NFSD, or report the current number of running threads
407  *
408  * Input:
409  *                      buf:            ignored
410  *                      size:           zero
411  * Output:
412  *      On success:     passed-in buffer filled with '\n'-terminated C
413  *                      string numeric value representing the number of
414  *                      running NFSD threads;
415  *                      return code is the size in bytes of the string
416  *      On error:       return code is zero
417  *
418  * OR
419  *
420  * Input:
421  *                      buf:            C string containing an unsigned
422  *                                      integer value representing the
423  *                                      number of NFSD threads to start
424  *                      size:           non-zero length of C string in @buf
425  * Output:
426  *      On success:     NFS service is started;
427  *                      passed-in buffer filled with '\n'-terminated C
428  *                      string numeric value representing the number of
429  *                      running NFSD threads;
430  *                      return code is the size in bytes of the string
431  *      On error:       return code is zero or a negative errno value
432  */
433 static ssize_t write_threads(struct file *file, char *buf, size_t size)
434 {
435         char *mesg = buf;
436         int rv;
437         struct net *net = netns(file);
438 
439         if (size > 0) {
440                 int newthreads;
441                 rv = get_int(&mesg, &newthreads);
442                 if (rv)
443                         return rv;
444                 if (newthreads < 0)
445                         return -EINVAL;
446                 rv = nfsd_svc(newthreads, net, file->f_cred);
447                 if (rv < 0)
448                         return rv;
449         } else
450                 rv = nfsd_nrthreads(net);
451 
452         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
453 }
454 
455 /*
456  * write_pool_threads - Set or report the current number of threads per pool
457  *
458  * Input:
459  *                      buf:            ignored
460  *                      size:           zero
461  *
462  * OR
463  *
464  * Input:
465  *                      buf:            C string containing whitespace-
466  *                                      separated unsigned integer values
467  *                                      representing the number of NFSD
468  *                                      threads to start in each pool
469  *                      size:           non-zero length of C string in @buf
470  * Output:
471  *      On success:     passed-in buffer filled with '\n'-terminated C
472  *                      string containing integer values representing the
473  *                      number of NFSD threads in each pool;
474  *                      return code is the size in bytes of the string
475  *      On error:       return code is zero or a negative errno value
476  */
477 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
478 {
479         /* if size > 0, look for an array of number of threads per node
480          * and apply them  then write out number of threads per node as reply
481          */
482         char *mesg = buf;
483         int i;
484         int rv;
485         int len;
486         int npools;
487         int *nthreads;
488         struct net *net = netns(file);
489 
490         mutex_lock(&nfsd_mutex);
491         npools = nfsd_nrpools(net);
492         if (npools == 0) {
493                 /*
494                  * NFS is shut down.  The admin can start it by
495                  * writing to the threads file but NOT the pool_threads
496                  * file, sorry.  Report zero threads.
497                  */
498                 mutex_unlock(&nfsd_mutex);
499                 strcpy(buf, "\n");
500                 return strlen(buf);
501         }
502 
503         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
504         rv = -ENOMEM;
505         if (nthreads == NULL)
506                 goto out_free;
507 
508         if (size > 0) {
509                 for (i = 0; i < npools; i++) {
510                         rv = get_int(&mesg, &nthreads[i]);
511                         if (rv == -ENOENT)
512                                 break;          /* fewer numbers than pools */
513                         if (rv)
514                                 goto out_free;  /* syntax error */
515                         rv = -EINVAL;
516                         if (nthreads[i] < 0)
517                                 goto out_free;
518                 }
519                 rv = nfsd_set_nrthreads(i, nthreads, net);
520                 if (rv)
521                         goto out_free;
522         }
523 
524         rv = nfsd_get_nrthreads(npools, nthreads, net);
525         if (rv)
526                 goto out_free;
527 
528         mesg = buf;
529         size = SIMPLE_TRANSACTION_LIMIT;
530         for (i = 0; i < npools && size > 0; i++) {
531                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
532                 len = strlen(mesg);
533                 size -= len;
534                 mesg += len;
535         }
536         rv = mesg - buf;
537 out_free:
538         kfree(nthreads);
539         mutex_unlock(&nfsd_mutex);
540         return rv;
541 }
542 
543 static ssize_t
544 nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
545                 const char *sep, unsigned vers, int minor)
546 {
547         const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
548         bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
549 
550         if (vers == 4 && minor >= 0 &&
551             !nfsd_minorversion(nn, minor, NFSD_TEST))
552                 supported = false;
553         if (minor == 0 && supported)
554                 /*
555                  * special case for backward compatability.
556                  * +4.0 is never reported, it is implied by
557                  * +4, unless -4.0 is present.
558                  */
559                 return 0;
560         return snprintf(buf, remaining, format, sep,
561                         supported ? '+' : '-', vers, minor);
562 }
563 
564 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
565 {
566         char *mesg = buf;
567         char *vers, *minorp, sign;
568         int len, num, remaining;
569         ssize_t tlen = 0;
570         char *sep;
571         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
572 
573         if (size>0) {
574                 if (nn->nfsd_serv)
575                         /* Cannot change versions without updating
576                          * nn->nfsd_serv->sv_xdrsize, and reallocing
577                          * rq_argp and rq_resp
578                          */
579                         return -EBUSY;
580                 if (buf[size-1] != '\n')
581                         return -EINVAL;
582                 buf[size-1] = 0;
583 
584                 vers = mesg;
585                 len = qword_get(&mesg, vers, size);
586                 if (len <= 0) return -EINVAL;
587                 do {
588                         enum vers_op cmd;
589                         unsigned minor;
590                         sign = *vers;
591                         if (sign == '+' || sign == '-')
592                                 num = simple_strtol((vers+1), &minorp, 0);
593                         else
594                                 num = simple_strtol(vers, &minorp, 0);
595                         if (*minorp == '.') {
596                                 if (num != 4)
597                                         return -EINVAL;
598                                 if (kstrtouint(minorp+1, 0, &minor) < 0)
599                                         return -EINVAL;
600                         }
601 
602                         cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
603                         switch(num) {
604                         case 2:
605                         case 3:
606                                 nfsd_vers(nn, num, cmd);
607                                 break;
608                         case 4:
609                                 if (*minorp == '.') {
610                                         if (nfsd_minorversion(nn, minor, cmd) < 0)
611                                                 return -EINVAL;
612                                 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
613                                         /*
614                                          * Either we have +4 and no minors are enabled,
615                                          * or we have -4 and at least one minor is enabled.
616                                          * In either case, propagate 'cmd' to all minors.
617                                          */
618                                         minor = 0;
619                                         while (nfsd_minorversion(nn, minor, cmd) >= 0)
620                                                 minor++;
621                                 }
622                                 break;
623                         default:
624                                 return -EINVAL;
625                         }
626                         vers += len + 1;
627                 } while ((len = qword_get(&mesg, vers, size)) > 0);
628                 /* If all get turned off, turn them back on, as
629                  * having no versions is BAD
630                  */
631                 nfsd_reset_versions(nn);
632         }
633 
634         /* Now write current state into reply buffer */
635         len = 0;
636         sep = "";
637         remaining = SIMPLE_TRANSACTION_LIMIT;
638         for (num=2 ; num <= 4 ; num++) {
639                 int minor;
640                 if (!nfsd_vers(nn, num, NFSD_AVAIL))
641                         continue;
642 
643                 minor = -1;
644                 do {
645                         len = nfsd_print_version_support(nn, buf, remaining,
646                                         sep, num, minor);
647                         if (len >= remaining)
648                                 goto out;
649                         remaining -= len;
650                         buf += len;
651                         tlen += len;
652                         minor++;
653                         if (len)
654                                 sep = " ";
655                 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
656         }
657 out:
658         len = snprintf(buf, remaining, "\n");
659         if (len >= remaining)
660                 return -EINVAL;
661         return tlen + len;
662 }
663 
664 /*
665  * write_versions - Set or report the available NFS protocol versions
666  *
667  * Input:
668  *                      buf:            ignored
669  *                      size:           zero
670  * Output:
671  *      On success:     passed-in buffer filled with '\n'-terminated C
672  *                      string containing positive or negative integer
673  *                      values representing the current status of each
674  *                      protocol version;
675  *                      return code is the size in bytes of the string
676  *      On error:       return code is zero or a negative errno value
677  *
678  * OR
679  *
680  * Input:
681  *                      buf:            C string containing whitespace-
682  *                                      separated positive or negative
683  *                                      integer values representing NFS
684  *                                      protocol versions to enable ("+n")
685  *                                      or disable ("-n")
686  *                      size:           non-zero length of C string in @buf
687  * Output:
688  *      On success:     status of zero or more protocol versions has
689  *                      been updated; passed-in buffer filled with
690  *                      '\n'-terminated C string containing positive
691  *                      or negative integer values representing the
692  *                      current status of each protocol version;
693  *                      return code is the size in bytes of the string
694  *      On error:       return code is zero or a negative errno value
695  */
696 static ssize_t write_versions(struct file *file, char *buf, size_t size)
697 {
698         ssize_t rv;
699 
700         mutex_lock(&nfsd_mutex);
701         rv = __write_versions(file, buf, size);
702         mutex_unlock(&nfsd_mutex);
703         return rv;
704 }
705 
706 /*
707  * Zero-length write.  Return a list of NFSD's current listener
708  * transports.
709  */
710 static ssize_t __write_ports_names(char *buf, struct net *net)
711 {
712         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
713 
714         if (nn->nfsd_serv == NULL)
715                 return 0;
716         return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
717 }
718 
719 /*
720  * A single 'fd' number was written, in which case it must be for
721  * a socket of a supported family/protocol, and we use it as an
722  * nfsd listener.
723  */
724 static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
725 {
726         char *mesg = buf;
727         int fd, err;
728         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
729 
730         err = get_int(&mesg, &fd);
731         if (err != 0 || fd < 0)
732                 return -EINVAL;
733 
734         if (svc_alien_sock(net, fd)) {
735                 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
736                 return -EINVAL;
737         }
738 
739         err = nfsd_create_serv(net);
740         if (err != 0)
741                 return err;
742 
743         err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
744         if (err < 0) {
745                 nfsd_destroy(net);
746                 return err;
747         }
748 
749         /* Decrease the count, but don't shut down the service */
750         nn->nfsd_serv->sv_nrthreads--;
751         return err;
752 }
753 
754 /*
755  * A transport listener is added by writing it's transport name and
756  * a port number.
757  */
758 static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
759 {
760         char transport[16];
761         struct svc_xprt *xprt;
762         int port, err;
763         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
764 
765         if (sscanf(buf, "%15s %5u", transport, &port) != 2)
766                 return -EINVAL;
767 
768         if (port < 1 || port > USHRT_MAX)
769                 return -EINVAL;
770 
771         err = nfsd_create_serv(net);
772         if (err != 0)
773                 return err;
774 
775         err = svc_create_xprt(nn->nfsd_serv, transport, net,
776                                 PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
777         if (err < 0)
778                 goto out_err;
779 
780         err = svc_create_xprt(nn->nfsd_serv, transport, net,
781                                 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
782         if (err < 0 && err != -EAFNOSUPPORT)
783                 goto out_close;
784 
785         /* Decrease the count, but don't shut down the service */
786         nn->nfsd_serv->sv_nrthreads--;
787         return 0;
788 out_close:
789         xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
790         if (xprt != NULL) {
791                 svc_close_xprt(xprt);
792                 svc_xprt_put(xprt);
793         }
794 out_err:
795         nfsd_destroy(net);
796         return err;
797 }
798 
799 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
800                              struct net *net)
801 {
802         if (size == 0)
803                 return __write_ports_names(buf, net);
804 
805         if (isdigit(buf[0]))
806                 return __write_ports_addfd(buf, net, file->f_cred);
807 
808         if (isalpha(buf[0]))
809                 return __write_ports_addxprt(buf, net, file->f_cred);
810 
811         return -EINVAL;
812 }
813 
814 /*
815  * write_ports - Pass a socket file descriptor or transport name to listen on
816  *
817  * Input:
818  *                      buf:            ignored
819  *                      size:           zero
820  * Output:
821  *      On success:     passed-in buffer filled with a '\n'-terminated C
822  *                      string containing a whitespace-separated list of
823  *                      named NFSD listeners;
824  *                      return code is the size in bytes of the string
825  *      On error:       return code is zero or a negative errno value
826  *
827  * OR
828  *
829  * Input:
830  *                      buf:            C string containing an unsigned
831  *                                      integer value representing a bound
832  *                                      but unconnected socket that is to be
833  *                                      used as an NFSD listener; listen(3)
834  *                                      must be called for a SOCK_STREAM
835  *                                      socket, otherwise it is ignored
836  *                      size:           non-zero length of C string in @buf
837  * Output:
838  *      On success:     NFS service is started;
839  *                      passed-in buffer filled with a '\n'-terminated C
840  *                      string containing a unique alphanumeric name of
841  *                      the listener;
842  *                      return code is the size in bytes of the string
843  *      On error:       return code is a negative errno value
844  *
845  * OR
846  *
847  * Input:
848  *                      buf:            C string containing a transport
849  *                                      name and an unsigned integer value
850  *                                      representing the port to listen on,
851  *                                      separated by whitespace
852  *                      size:           non-zero length of C string in @buf
853  * Output:
854  *      On success:     returns zero; NFS service is started
855  *      On error:       return code is a negative errno value
856  */
857 static ssize_t write_ports(struct file *file, char *buf, size_t size)
858 {
859         ssize_t rv;
860 
861         mutex_lock(&nfsd_mutex);
862         rv = __write_ports(file, buf, size, netns(file));
863         mutex_unlock(&nfsd_mutex);
864         return rv;
865 }
866 
867 
868 int nfsd_max_blksize;
869 
870 /*
871  * write_maxblksize - Set or report the current NFS blksize
872  *
873  * Input:
874  *                      buf:            ignored
875  *                      size:           zero
876  *
877  * OR
878  *
879  * Input:
880  *                      buf:            C string containing an unsigned
881  *                                      integer value representing the new
882  *                                      NFS blksize
883  *                      size:           non-zero length of C string in @buf
884  * Output:
885  *      On success:     passed-in buffer filled with '\n'-terminated C string
886  *                      containing numeric value of the current NFS blksize
887  *                      setting;
888  *                      return code is the size in bytes of the string
889  *      On error:       return code is zero or a negative errno value
890  */
891 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
892 {
893         char *mesg = buf;
894         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
895 
896         if (size > 0) {
897                 int bsize;
898                 int rv = get_int(&mesg, &bsize);
899                 if (rv)
900                         return rv;
901                 /* force bsize into allowed range and
902                  * required alignment.
903                  */
904                 bsize = max_t(int, bsize, 1024);
905                 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
906                 bsize &= ~(1024-1);
907                 mutex_lock(&nfsd_mutex);
908                 if (nn->nfsd_serv) {
909                         mutex_unlock(&nfsd_mutex);
910                         return -EBUSY;
911                 }
912                 nfsd_max_blksize = bsize;
913                 mutex_unlock(&nfsd_mutex);
914         }
915 
916         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
917                                                         nfsd_max_blksize);
918 }
919 
920 /*
921  * write_maxconn - Set or report the current max number of connections
922  *
923  * Input:
924  *                      buf:            ignored
925  *                      size:           zero
926  * OR
927  *
928  * Input:
929  *                      buf:            C string containing an unsigned
930  *                                      integer value representing the new
931  *                                      number of max connections
932  *                      size:           non-zero length of C string in @buf
933  * Output:
934  *      On success:     passed-in buffer filled with '\n'-terminated C string
935  *                      containing numeric value of max_connections setting
936  *                      for this net namespace;
937  *                      return code is the size in bytes of the string
938  *      On error:       return code is zero or a negative errno value
939  */
940 static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
941 {
942         char *mesg = buf;
943         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
944         unsigned int maxconn = nn->max_connections;
945 
946         if (size > 0) {
947                 int rv = get_uint(&mesg, &maxconn);
948 
949                 if (rv)
950                         return rv;
951                 nn->max_connections = maxconn;
952         }
953 
954         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
955 }
956 
957 #ifdef CONFIG_NFSD_V4
958 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
959                                   time64_t *time, struct nfsd_net *nn)
960 {
961         char *mesg = buf;
962         int rv, i;
963 
964         if (size > 0) {
965                 if (nn->nfsd_serv)
966                         return -EBUSY;
967                 rv = get_int(&mesg, &i);
968                 if (rv)
969                         return rv;
970                 /*
971                  * Some sanity checking.  We don't have a reason for
972                  * these particular numbers, but problems with the
973                  * extremes are:
974                  *      - Too short: the briefest network outage may
975                  *        cause clients to lose all their locks.  Also,
976                  *        the frequent polling may be wasteful.
977                  *      - Too long: do you really want reboot recovery
978                  *        to take more than an hour?  Or to make other
979                  *        clients wait an hour before being able to
980                  *        revoke a dead client's locks?
981                  */
982                 if (i < 10 || i > 3600)
983                         return -EINVAL;
984                 *time = i;
985         }
986 
987         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time);
988 }
989 
990 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
991                                 time64_t *time, struct nfsd_net *nn)
992 {
993         ssize_t rv;
994 
995         mutex_lock(&nfsd_mutex);
996         rv = __nfsd4_write_time(file, buf, size, time, nn);
997         mutex_unlock(&nfsd_mutex);
998         return rv;
999 }
1000 
1001 /*
1002  * write_leasetime - Set or report the current NFSv4 lease time
1003  *
1004  * Input:
1005  *                      buf:            ignored
1006  *                      size:           zero
1007  *
1008  * OR
1009  *
1010  * Input:
1011  *                      buf:            C string containing an unsigned
1012  *                                      integer value representing the new
1013  *                                      NFSv4 lease expiry time
1014  *                      size:           non-zero length of C string in @buf
1015  * Output:
1016  *      On success:     passed-in buffer filled with '\n'-terminated C
1017  *                      string containing unsigned integer value of the
1018  *                      current lease expiry time;
1019  *                      return code is the size in bytes of the string
1020  *      On error:       return code is zero or a negative errno value
1021  */
1022 static ssize_t write_leasetime(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_lease, nn);
1026 }
1027 
1028 /*
1029  * write_gracetime - Set or report current NFSv4 grace period time
1030  *
1031  * As above, but sets the time of the NFSv4 grace period.
1032  *
1033  * Note this should never be set to less than the *previous*
1034  * lease-period time, but we don't try to enforce this.  (In the common
1035  * case (a new boot), we don't know what the previous lease time was
1036  * anyway.)
1037  */
1038 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1039 {
1040         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1041         return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1042 }
1043 
1044 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1045                                    struct nfsd_net *nn)
1046 {
1047         char *mesg = buf;
1048         char *recdir;
1049         int len, status;
1050 
1051         if (size > 0) {
1052                 if (nn->nfsd_serv)
1053                         return -EBUSY;
1054                 if (size > PATH_MAX || buf[size-1] != '\n')
1055                         return -EINVAL;
1056                 buf[size-1] = 0;
1057 
1058                 recdir = mesg;
1059                 len = qword_get(&mesg, recdir, size);
1060                 if (len <= 0)
1061                         return -EINVAL;
1062 
1063                 status = nfs4_reset_recoverydir(recdir);
1064                 if (status)
1065                         return status;
1066         }
1067 
1068         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1069                                                         nfs4_recoverydir());
1070 }
1071 
1072 /*
1073  * write_recoverydir - Set or report the pathname of the recovery directory
1074  *
1075  * Input:
1076  *                      buf:            ignored
1077  *                      size:           zero
1078  *
1079  * OR
1080  *
1081  * Input:
1082  *                      buf:            C string containing the pathname
1083  *                                      of the directory on a local file
1084  *                                      system containing permanent NFSv4
1085  *                                      recovery data
1086  *                      size:           non-zero length of C string in @buf
1087  * Output:
1088  *      On success:     passed-in buffer filled with '\n'-terminated C string
1089  *                      containing the current recovery pathname setting;
1090  *                      return code is the size in bytes of the string
1091  *      On error:       return code is zero or a negative errno value
1092  */
1093 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1094 {
1095         ssize_t rv;
1096         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1097 
1098         mutex_lock(&nfsd_mutex);
1099         rv = __write_recoverydir(file, buf, size, nn);
1100         mutex_unlock(&nfsd_mutex);
1101         return rv;
1102 }
1103 
1104 /*
1105  * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1106  *
1107  * Input:
1108  *                      buf:            ignored
1109  *                      size:           zero
1110  * OR
1111  *
1112  * Input:
1113  *                      buf:            any value
1114  *                      size:           non-zero length of C string in @buf
1115  * Output:
1116  *                      passed-in buffer filled with "Y" or "N" with a newline
1117  *                      and NULL-terminated C string. This indicates whether
1118  *                      the grace period has ended in the current net
1119  *                      namespace. Return code is the size in bytes of the
1120  *                      string. Writing a string that starts with 'Y', 'y', or
1121  *                      '1' to the file will end the grace period for nfsd's v4
1122  *                      lock manager.
1123  */
1124 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1125 {
1126         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1127 
1128         if (size > 0) {
1129                 switch(buf[0]) {
1130                 case 'Y':
1131                 case 'y':
1132                 case '1':
1133                         if (!nn->nfsd_serv)
1134                                 return -EBUSY;
1135                         nfsd4_end_grace(nn);
1136                         break;
1137                 default:
1138                         return -EINVAL;
1139                 }
1140         }
1141 
1142         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1143                          nn->grace_ended ? 'Y' : 'N');
1144 }
1145 
1146 #endif
1147 
1148 /*----------------------------------------------------------------------------*/
1149 /*
1150  *      populating the filesystem.
1151  */
1152 
1153 /* Basically copying rpc_get_inode. */
1154 static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
1155 {
1156         struct inode *inode = new_inode(sb);
1157         if (!inode)
1158                 return NULL;
1159         /* Following advice from simple_fill_super documentation: */
1160         inode->i_ino = iunique(sb, NFSD_MaxReserved);
1161         inode->i_mode = mode;
1162         inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
1163         switch (mode & S_IFMT) {
1164         case S_IFDIR:
1165                 inode->i_fop = &simple_dir_operations;
1166                 inode->i_op = &simple_dir_inode_operations;
1167                 inc_nlink(inode);
1168         default:
1169                 break;
1170         }
1171         return inode;
1172 }
1173 
1174 static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
1175 {
1176         struct inode *inode;
1177 
1178         inode = nfsd_get_inode(dir->i_sb, mode);
1179         if (!inode)
1180                 return -ENOMEM;
1181         if (ncl) {
1182                 inode->i_private = ncl;
1183                 kref_get(&ncl->cl_ref);
1184         }
1185         d_add(dentry, inode);
1186         inc_nlink(dir);
1187         fsnotify_mkdir(dir, dentry);
1188         return 0;
1189 }
1190 
1191 static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
1192 {
1193         struct inode *dir = parent->d_inode;
1194         struct dentry *dentry;
1195         int ret = -ENOMEM;
1196 
1197         inode_lock(dir);
1198         dentry = d_alloc_name(parent, name);
1199         if (!dentry)
1200                 goto out_err;
1201         ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
1202         if (ret)
1203                 goto out_err;
1204 out:
1205         inode_unlock(dir);
1206         return dentry;
1207 out_err:
1208         dput(dentry);
1209         dentry = ERR_PTR(ret);
1210         goto out;
1211 }
1212 
1213 static void clear_ncl(struct inode *inode)
1214 {
1215         struct nfsdfs_client *ncl = inode->i_private;
1216 
1217         inode->i_private = NULL;
1218         kref_put(&ncl->cl_ref, ncl->cl_release);
1219 }
1220 
1221 static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode)
1222 {
1223         struct nfsdfs_client *nc = inode->i_private;
1224 
1225         if (nc)
1226                 kref_get(&nc->cl_ref);
1227         return nc;
1228 }
1229 
1230 struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
1231 {
1232         struct nfsdfs_client *nc;
1233 
1234         inode_lock_shared(inode);
1235         nc = __get_nfsdfs_client(inode);
1236         inode_unlock_shared(inode);
1237         return nc;
1238 }
1239 /* from __rpc_unlink */
1240 static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry)
1241 {
1242         int ret;
1243 
1244         clear_ncl(d_inode(dentry));
1245         dget(dentry);
1246         ret = simple_unlink(dir, dentry);
1247         d_delete(dentry);
1248         dput(dentry);
1249         WARN_ON_ONCE(ret);
1250 }
1251 
1252 static void nfsdfs_remove_files(struct dentry *root)
1253 {
1254         struct dentry *dentry, *tmp;
1255 
1256         list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) {
1257                 if (!simple_positive(dentry)) {
1258                         WARN_ON_ONCE(1); /* I think this can't happen? */
1259                         continue;
1260                 }
1261                 nfsdfs_remove_file(d_inode(root), dentry);
1262         }
1263 }
1264 
1265 /* XXX: cut'n'paste from simple_fill_super; figure out if we could share
1266  * code instead. */
1267 static  int nfsdfs_create_files(struct dentry *root,
1268                                         const struct tree_descr *files)
1269 {
1270         struct inode *dir = d_inode(root);
1271         struct inode *inode;
1272         struct dentry *dentry;
1273         int i;
1274 
1275         inode_lock(dir);
1276         for (i = 0; files->name && files->name[0]; i++, files++) {
1277                 if (!files->name)
1278                         continue;
1279                 dentry = d_alloc_name(root, files->name);
1280                 if (!dentry)
1281                         goto out;
1282                 inode = nfsd_get_inode(d_inode(root)->i_sb,
1283                                         S_IFREG | files->mode);
1284                 if (!inode) {
1285                         dput(dentry);
1286                         goto out;
1287                 }
1288                 inode->i_fop = files->ops;
1289                 inode->i_private = __get_nfsdfs_client(dir);
1290                 d_add(dentry, inode);
1291                 fsnotify_create(dir, dentry);
1292         }
1293         inode_unlock(dir);
1294         return 0;
1295 out:
1296         nfsdfs_remove_files(root);
1297         inode_unlock(dir);
1298         return -ENOMEM;
1299 }
1300 
1301 /* on success, returns positive number unique to that client. */
1302 struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
1303                 struct nfsdfs_client *ncl, u32 id,
1304                 const struct tree_descr *files)
1305 {
1306         struct dentry *dentry;
1307         char name[11];
1308         int ret;
1309 
1310         sprintf(name, "%u", id);
1311 
1312         dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
1313         if (IS_ERR(dentry)) /* XXX: tossing errors? */
1314                 return NULL;
1315         ret = nfsdfs_create_files(dentry, files);
1316         if (ret) {
1317                 nfsd_client_rmdir(dentry);
1318                 return NULL;
1319         }
1320         return dentry;
1321 }
1322 
1323 /* Taken from __rpc_rmdir: */
1324 void nfsd_client_rmdir(struct dentry *dentry)
1325 {
1326         struct inode *dir = d_inode(dentry->d_parent);
1327         struct inode *inode = d_inode(dentry);
1328         int ret;
1329 
1330         inode_lock(dir);
1331         nfsdfs_remove_files(dentry);
1332         clear_ncl(inode);
1333         dget(dentry);
1334         ret = simple_rmdir(dir, dentry);
1335         WARN_ON_ONCE(ret);
1336         fsnotify_rmdir(dir, dentry);
1337         d_delete(dentry);
1338         dput(dentry);
1339         inode_unlock(dir);
1340 }
1341 
1342 static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
1343 {
1344         struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
1345                                                         nfsd_net_id);
1346         struct dentry *dentry;
1347         int ret;
1348 
1349         static const struct tree_descr nfsd_files[] = {
1350                 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1351                 [NFSD_Export_features] = {"export_features",
1352                                         &export_features_operations, S_IRUGO},
1353                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1354                                         &transaction_ops, S_IWUSR|S_IRUSR},
1355                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1356                                         &transaction_ops, S_IWUSR|S_IRUSR},
1357                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1358                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1359                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1360                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1361                 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1362                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1363                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1364                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1365                 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1366 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1367                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1368 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1369 #ifdef CONFIG_NFSD_V4
1370                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1371                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1372                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1373                 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1374 #endif
1375                 /* last one */ {""}
1376         };
1377 
1378         ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1379         if (ret)
1380                 return ret;
1381         dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
1382         if (IS_ERR(dentry))
1383                 return PTR_ERR(dentry);
1384         nn->nfsd_client_dir = dentry;
1385         return 0;
1386 }
1387 
1388 static int nfsd_fs_get_tree(struct fs_context *fc)
1389 {
1390         return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
1391 }
1392 
1393 static void nfsd_fs_free_fc(struct fs_context *fc)
1394 {
1395         if (fc->s_fs_info)
1396                 put_net(fc->s_fs_info);
1397 }
1398 
1399 static const struct fs_context_operations nfsd_fs_context_ops = {
1400         .free           = nfsd_fs_free_fc,
1401         .get_tree       = nfsd_fs_get_tree,
1402 };
1403 
1404 static int nfsd_init_fs_context(struct fs_context *fc)
1405 {
1406         put_user_ns(fc->user_ns);
1407         fc->user_ns = get_user_ns(fc->net_ns->user_ns);
1408         fc->ops = &nfsd_fs_context_ops;
1409         return 0;
1410 }
1411 
1412 static void nfsd_umount(struct super_block *sb)
1413 {
1414         struct net *net = sb->s_fs_info;
1415 
1416         kill_litter_super(sb);
1417         put_net(net);
1418 }
1419 
1420 static struct file_system_type nfsd_fs_type = {
1421         .owner          = THIS_MODULE,
1422         .name           = "nfsd",
1423         .init_fs_context = nfsd_init_fs_context,
1424         .kill_sb        = nfsd_umount,
1425 };
1426 MODULE_ALIAS_FS("nfsd");
1427 
1428 int get_nfsdfs(struct net *net)
1429 {
1430         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1431         struct vfsmount *mnt;
1432 
1433         mnt =  vfs_kern_mount(&nfsd_fs_type, SB_KERNMOUNT, "nfsd", NULL);
1434         if (IS_ERR(mnt))
1435                 return PTR_ERR(mnt);
1436         nn->nfsd_mnt = mnt;
1437         return 0;
1438 }
1439 
1440 #ifdef CONFIG_PROC_FS
1441 static int create_proc_exports_entry(void)
1442 {
1443         struct proc_dir_entry *entry;
1444 
1445         entry = proc_mkdir("fs/nfs", NULL);
1446         if (!entry)
1447                 return -ENOMEM;
1448         entry = proc_create("exports", 0, entry, &exports_proc_ops);
1449         if (!entry) {
1450                 remove_proc_entry("fs/nfs", NULL);
1451                 return -ENOMEM;
1452         }
1453         return 0;
1454 }
1455 #else /* CONFIG_PROC_FS */
1456 static int create_proc_exports_entry(void)
1457 {
1458         return 0;
1459 }
1460 #endif
1461 
1462 unsigned int nfsd_net_id;
1463 
1464 static __net_init int nfsd_init_net(struct net *net)
1465 {
1466         int retval;
1467         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1468 
1469         retval = nfsd_export_init(net);
1470         if (retval)
1471                 goto out_export_error;
1472         retval = nfsd_idmap_init(net);
1473         if (retval)
1474                 goto out_idmap_error;
1475         nn->nfsd_versions = NULL;
1476         nn->nfsd4_minorversions = NULL;
1477         retval = nfsd_reply_cache_init(nn);
1478         if (retval)
1479                 goto out_drc_error;
1480         nn->nfsd4_lease = 90;   /* default lease time */
1481         nn->nfsd4_grace = 90;
1482         nn->somebody_reclaimed = false;
1483         nn->track_reclaim_completes = false;
1484         nn->clverifier_counter = prandom_u32();
1485         nn->clientid_base = prandom_u32();
1486         nn->clientid_counter = nn->clientid_base + 1;
1487         nn->s2s_cp_cl_id = nn->clientid_counter++;
1488 
1489         atomic_set(&nn->ntf_refcnt, 0);
1490         init_waitqueue_head(&nn->ntf_wq);
1491         seqlock_init(&nn->boot_lock);
1492 
1493         return 0;
1494 
1495 out_drc_error:
1496         nfsd_idmap_shutdown(net);
1497 out_idmap_error:
1498         nfsd_export_shutdown(net);
1499 out_export_error:
1500         return retval;
1501 }
1502 
1503 static __net_exit void nfsd_exit_net(struct net *net)
1504 {
1505         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1506 
1507         nfsd_reply_cache_shutdown(nn);
1508         nfsd_idmap_shutdown(net);
1509         nfsd_export_shutdown(net);
1510         nfsd_netns_free_versions(net_generic(net, nfsd_net_id));
1511 }
1512 
1513 static struct pernet_operations nfsd_net_ops = {
1514         .init = nfsd_init_net,
1515         .exit = nfsd_exit_net,
1516         .id   = &nfsd_net_id,
1517         .size = sizeof(struct nfsd_net),
1518 };
1519 
1520 static int __init init_nfsd(void)
1521 {
1522         int retval;
1523         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1524 
1525         retval = register_pernet_subsys(&nfsd_net_ops);
1526         if (retval < 0)
1527                 return retval;
1528         retval = register_cld_notifier();
1529         if (retval)
1530                 goto out_unregister_pernet;
1531         retval = nfsd4_init_slabs();
1532         if (retval)
1533                 goto out_unregister_notifier;
1534         retval = nfsd4_init_pnfs();
1535         if (retval)
1536                 goto out_free_slabs;
1537         nfsd_fault_inject_init(); /* nfsd fault injection controls */
1538         nfsd_stat_init();       /* Statistics */
1539         retval = nfsd_drc_slab_create();
1540         if (retval)
1541                 goto out_free_stat;
1542         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1543         retval = create_proc_exports_entry();
1544         if (retval)
1545                 goto out_free_lockd;
1546         retval = register_filesystem(&nfsd_fs_type);
1547         if (retval)
1548                 goto out_free_all;
1549         return 0;
1550 out_free_all:
1551         remove_proc_entry("fs/nfs/exports", NULL);
1552         remove_proc_entry("fs/nfs", NULL);
1553 out_free_lockd:
1554         nfsd_lockd_shutdown();
1555         nfsd_drc_slab_free();
1556 out_free_stat:
1557         nfsd_stat_shutdown();
1558         nfsd_fault_inject_cleanup();
1559         nfsd4_exit_pnfs();
1560 out_free_slabs:
1561         nfsd4_free_slabs();
1562 out_unregister_notifier:
1563         unregister_cld_notifier();
1564 out_unregister_pernet:
1565         unregister_pernet_subsys(&nfsd_net_ops);
1566         return retval;
1567 }
1568 
1569 static void __exit exit_nfsd(void)
1570 {
1571         nfsd_drc_slab_free();
1572         remove_proc_entry("fs/nfs/exports", NULL);
1573         remove_proc_entry("fs/nfs", NULL);
1574         nfsd_stat_shutdown();
1575         nfsd_lockd_shutdown();
1576         nfsd4_free_slabs();
1577         nfsd4_exit_pnfs();
1578         nfsd_fault_inject_cleanup();
1579         unregister_filesystem(&nfsd_fs_type);
1580         unregister_cld_notifier();
1581         unregister_pernet_subsys(&nfsd_net_ops);
1582 }
1583 
1584 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1585 MODULE_LICENSE("GPL");
1586 module_init(init_nfsd)
1587 module_exit(exit_nfsd)
1588 

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