Version:  2.0.40 2.2.26 2.4.37 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19

Linux/fs/nfsd/nfsctl.c

  1 /*
  2  * Syscall interface to knfsd.
  3  *
  4  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
  5  */
  6 
  7 #include <linux/slab.h>
  8 #include <linux/namei.h>
  9 #include <linux/ctype.h>
 10 
 11 #include <linux/sunrpc/svcsock.h>
 12 #include <linux/lockd/lockd.h>
 13 #include <linux/sunrpc/addr.h>
 14 #include <linux/sunrpc/gss_api.h>
 15 #include <linux/sunrpc/gss_krb5_enctypes.h>
 16 #include <linux/sunrpc/rpc_pipe_fs.h>
 17 #include <linux/module.h>
 18 
 19 #include "idmap.h"
 20 #include "nfsd.h"
 21 #include "cache.h"
 22 #include "state.h"
 23 #include "netns.h"
 24 
 25 /*
 26  *      We have a single directory with several nodes in it.
 27  */
 28 enum {
 29         NFSD_Root = 1,
 30         NFSD_List,
 31         NFSD_Export_features,
 32         NFSD_Fh,
 33         NFSD_FO_UnlockIP,
 34         NFSD_FO_UnlockFS,
 35         NFSD_Threads,
 36         NFSD_Pool_Threads,
 37         NFSD_Pool_Stats,
 38         NFSD_Reply_Cache_Stats,
 39         NFSD_Versions,
 40         NFSD_Ports,
 41         NFSD_MaxBlkSize,
 42         NFSD_MaxConnections,
 43         NFSD_SupportedEnctypes,
 44         /*
 45          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
 46          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
 47          */
 48 #ifdef CONFIG_NFSD_V4
 49         NFSD_Leasetime,
 50         NFSD_Gracetime,
 51         NFSD_RecoveryDir,
 52         NFSD_V4EndGrace,
 53 #endif
 54 };
 55 
 56 /*
 57  * write() for these nodes.
 58  */
 59 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
 60 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
 61 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
 62 static ssize_t write_threads(struct file *file, char *buf, size_t size);
 63 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
 64 static ssize_t write_versions(struct file *file, char *buf, size_t size);
 65 static ssize_t write_ports(struct file *file, char *buf, size_t size);
 66 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
 67 static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
 68 #ifdef CONFIG_NFSD_V4
 69 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
 70 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
 71 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
 72 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
 73 #endif
 74 
 75 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 76         [NFSD_Fh] = write_filehandle,
 77         [NFSD_FO_UnlockIP] = write_unlock_ip,
 78         [NFSD_FO_UnlockFS] = write_unlock_fs,
 79         [NFSD_Threads] = write_threads,
 80         [NFSD_Pool_Threads] = write_pool_threads,
 81         [NFSD_Versions] = write_versions,
 82         [NFSD_Ports] = write_ports,
 83         [NFSD_MaxBlkSize] = write_maxblksize,
 84         [NFSD_MaxConnections] = write_maxconn,
 85 #ifdef CONFIG_NFSD_V4
 86         [NFSD_Leasetime] = write_leasetime,
 87         [NFSD_Gracetime] = write_gracetime,
 88         [NFSD_RecoveryDir] = write_recoverydir,
 89         [NFSD_V4EndGrace] = write_v4_end_grace,
 90 #endif
 91 };
 92 
 93 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 94 {
 95         ino_t ino =  file_inode(file)->i_ino;
 96         char *data;
 97         ssize_t rv;
 98 
 99         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
100                 return -EINVAL;
101 
102         data = simple_transaction_get(file, buf, size);
103         if (IS_ERR(data))
104                 return PTR_ERR(data);
105 
106         rv =  write_op[ino](file, data, size);
107         if (rv >= 0) {
108                 simple_transaction_set(file, rv);
109                 rv = size;
110         }
111         return rv;
112 }
113 
114 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
115 {
116         if (! file->private_data) {
117                 /* An attempt to read a transaction file without writing
118                  * causes a 0-byte write so that the file can return
119                  * state information
120                  */
121                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
122                 if (rv < 0)
123                         return rv;
124         }
125         return simple_transaction_read(file, buf, size, pos);
126 }
127 
128 static const struct file_operations transaction_ops = {
129         .write          = nfsctl_transaction_write,
130         .read           = nfsctl_transaction_read,
131         .release        = simple_transaction_release,
132         .llseek         = default_llseek,
133 };
134 
135 static int exports_net_open(struct net *net, struct file *file)
136 {
137         int err;
138         struct seq_file *seq;
139         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
140 
141         err = seq_open(file, &nfs_exports_op);
142         if (err)
143                 return err;
144 
145         seq = file->private_data;
146         seq->private = nn->svc_export_cache;
147         return 0;
148 }
149 
150 static int exports_proc_open(struct inode *inode, struct file *file)
151 {
152         return exports_net_open(current->nsproxy->net_ns, file);
153 }
154 
155 static const struct file_operations exports_proc_operations = {
156         .open           = exports_proc_open,
157         .read           = seq_read,
158         .llseek         = seq_lseek,
159         .release        = seq_release,
160         .owner          = THIS_MODULE,
161 };
162 
163 static int exports_nfsd_open(struct inode *inode, struct file *file)
164 {
165         return exports_net_open(inode->i_sb->s_fs_info, file);
166 }
167 
168 static const struct file_operations exports_nfsd_operations = {
169         .open           = exports_nfsd_open,
170         .read           = seq_read,
171         .llseek         = seq_lseek,
172         .release        = seq_release,
173         .owner          = THIS_MODULE,
174 };
175 
176 static int export_features_show(struct seq_file *m, void *v)
177 {
178         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
179         return 0;
180 }
181 
182 static int export_features_open(struct inode *inode, struct file *file)
183 {
184         return single_open(file, export_features_show, NULL);
185 }
186 
187 static const struct file_operations export_features_operations = {
188         .open           = export_features_open,
189         .read           = seq_read,
190         .llseek         = seq_lseek,
191         .release        = single_release,
192 };
193 
194 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
195 static int supported_enctypes_show(struct seq_file *m, void *v)
196 {
197         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
198         return 0;
199 }
200 
201 static int supported_enctypes_open(struct inode *inode, struct file *file)
202 {
203         return single_open(file, supported_enctypes_show, NULL);
204 }
205 
206 static const struct file_operations supported_enctypes_ops = {
207         .open           = supported_enctypes_open,
208         .read           = seq_read,
209         .llseek         = seq_lseek,
210         .release        = single_release,
211 };
212 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
213 
214 static const struct file_operations pool_stats_operations = {
215         .open           = nfsd_pool_stats_open,
216         .read           = seq_read,
217         .llseek         = seq_lseek,
218         .release        = nfsd_pool_stats_release,
219         .owner          = THIS_MODULE,
220 };
221 
222 static struct file_operations reply_cache_stats_operations = {
223         .open           = nfsd_reply_cache_stats_open,
224         .read           = seq_read,
225         .llseek         = seq_lseek,
226         .release        = single_release,
227 };
228 
229 /*----------------------------------------------------------------------------*/
230 /*
231  * payload - write methods
232  */
233 
234 static inline struct net *netns(struct file *file)
235 {
236         return file_inode(file)->i_sb->s_fs_info;
237 }
238 
239 /**
240  * write_unlock_ip - Release all locks used by a client
241  *
242  * Experimental.
243  *
244  * Input:
245  *                      buf:    '\n'-terminated C string containing a
246  *                              presentation format IP address
247  *                      size:   length of C string in @buf
248  * Output:
249  *      On success:     returns zero if all specified locks were released;
250  *                      returns one if one or more locks were not released
251  *      On error:       return code is negative errno value
252  */
253 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
254 {
255         struct sockaddr_storage address;
256         struct sockaddr *sap = (struct sockaddr *)&address;
257         size_t salen = sizeof(address);
258         char *fo_path;
259         struct net *net = netns(file);
260 
261         /* sanity check */
262         if (size == 0)
263                 return -EINVAL;
264 
265         if (buf[size-1] != '\n')
266                 return -EINVAL;
267 
268         fo_path = buf;
269         if (qword_get(&buf, fo_path, size) < 0)
270                 return -EINVAL;
271 
272         if (rpc_pton(net, fo_path, size, sap, salen) == 0)
273                 return -EINVAL;
274 
275         return nlmsvc_unlock_all_by_ip(sap);
276 }
277 
278 /**
279  * write_unlock_fs - Release all locks on a local file system
280  *
281  * Experimental.
282  *
283  * Input:
284  *                      buf:    '\n'-terminated C string containing the
285  *                              absolute pathname of a local file system
286  *                      size:   length of C string in @buf
287  * Output:
288  *      On success:     returns zero if all specified locks were released;
289  *                      returns one if one or more locks were not released
290  *      On error:       return code is negative errno value
291  */
292 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
293 {
294         struct path path;
295         char *fo_path;
296         int error;
297 
298         /* sanity check */
299         if (size == 0)
300                 return -EINVAL;
301 
302         if (buf[size-1] != '\n')
303                 return -EINVAL;
304 
305         fo_path = buf;
306         if (qword_get(&buf, fo_path, size) < 0)
307                 return -EINVAL;
308 
309         error = kern_path(fo_path, 0, &path);
310         if (error)
311                 return error;
312 
313         /*
314          * XXX: Needs better sanity checking.  Otherwise we could end up
315          * releasing locks on the wrong file system.
316          *
317          * For example:
318          * 1.  Does the path refer to a directory?
319          * 2.  Is that directory a mount point, or
320          * 3.  Is that directory the root of an exported file system?
321          */
322         error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
323 
324         path_put(&path);
325         return error;
326 }
327 
328 /**
329  * write_filehandle - Get a variable-length NFS file handle by path
330  *
331  * On input, the buffer contains a '\n'-terminated C string comprised of
332  * three alphanumeric words separated by whitespace.  The string may
333  * contain escape sequences.
334  *
335  * Input:
336  *                      buf:
337  *                              domain:         client domain name
338  *                              path:           export pathname
339  *                              maxsize:        numeric maximum size of
340  *                                              @buf
341  *                      size:   length of C string in @buf
342  * Output:
343  *      On success:     passed-in buffer filled with '\n'-terminated C
344  *                      string containing a ASCII hex text version
345  *                      of the NFS file handle;
346  *                      return code is the size in bytes of the string
347  *      On error:       return code is negative errno value
348  */
349 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
350 {
351         char *dname, *path;
352         int uninitialized_var(maxsize);
353         char *mesg = buf;
354         int len;
355         struct auth_domain *dom;
356         struct knfsd_fh fh;
357 
358         if (size == 0)
359                 return -EINVAL;
360 
361         if (buf[size-1] != '\n')
362                 return -EINVAL;
363         buf[size-1] = 0;
364 
365         dname = mesg;
366         len = qword_get(&mesg, dname, size);
367         if (len <= 0)
368                 return -EINVAL;
369         
370         path = dname+len+1;
371         len = qword_get(&mesg, path, size);
372         if (len <= 0)
373                 return -EINVAL;
374 
375         len = get_int(&mesg, &maxsize);
376         if (len)
377                 return len;
378 
379         if (maxsize < NFS_FHSIZE)
380                 return -EINVAL;
381         maxsize = min(maxsize, NFS3_FHSIZE);
382 
383         if (qword_get(&mesg, mesg, size)>0)
384                 return -EINVAL;
385 
386         /* we have all the words, they are in buf.. */
387         dom = unix_domain_find(dname);
388         if (!dom)
389                 return -ENOMEM;
390 
391         len = exp_rootfh(netns(file), dom, path, &fh,  maxsize);
392         auth_domain_put(dom);
393         if (len)
394                 return len;
395         
396         mesg = buf;
397         len = SIMPLE_TRANSACTION_LIMIT;
398         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
399         mesg[-1] = '\n';
400         return mesg - buf;      
401 }
402 
403 /**
404  * write_threads - Start NFSD, or report the current number of running threads
405  *
406  * Input:
407  *                      buf:            ignored
408  *                      size:           zero
409  * Output:
410  *      On success:     passed-in buffer filled with '\n'-terminated C
411  *                      string numeric value representing the number of
412  *                      running NFSD threads;
413  *                      return code is the size in bytes of the string
414  *      On error:       return code is zero
415  *
416  * OR
417  *
418  * Input:
419  *                      buf:            C string containing an unsigned
420  *                                      integer value representing the
421  *                                      number of NFSD threads to start
422  *                      size:           non-zero length of C string in @buf
423  * Output:
424  *      On success:     NFS service is started;
425  *                      passed-in buffer filled with '\n'-terminated C
426  *                      string numeric value representing the number of
427  *                      running NFSD threads;
428  *                      return code is the size in bytes of the string
429  *      On error:       return code is zero or a negative errno value
430  */
431 static ssize_t write_threads(struct file *file, char *buf, size_t size)
432 {
433         char *mesg = buf;
434         int rv;
435         struct net *net = netns(file);
436 
437         if (size > 0) {
438                 int newthreads;
439                 rv = get_int(&mesg, &newthreads);
440                 if (rv)
441                         return rv;
442                 if (newthreads < 0)
443                         return -EINVAL;
444                 rv = nfsd_svc(newthreads, net);
445                 if (rv < 0)
446                         return rv;
447         } else
448                 rv = nfsd_nrthreads(net);
449 
450         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
451 }
452 
453 /**
454  * write_pool_threads - Set or report the current number of threads per pool
455  *
456  * Input:
457  *                      buf:            ignored
458  *                      size:           zero
459  *
460  * OR
461  *
462  * Input:
463  *                      buf:            C string containing whitespace-
464  *                                      separated unsigned integer values
465  *                                      representing the number of NFSD
466  *                                      threads to start in each pool
467  *                      size:           non-zero length of C string in @buf
468  * Output:
469  *      On success:     passed-in buffer filled with '\n'-terminated C
470  *                      string containing integer values representing the
471  *                      number of NFSD threads in each pool;
472  *                      return code is the size in bytes of the string
473  *      On error:       return code is zero or a negative errno value
474  */
475 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
476 {
477         /* if size > 0, look for an array of number of threads per node
478          * and apply them  then write out number of threads per node as reply
479          */
480         char *mesg = buf;
481         int i;
482         int rv;
483         int len;
484         int npools;
485         int *nthreads;
486         struct net *net = netns(file);
487 
488         mutex_lock(&nfsd_mutex);
489         npools = nfsd_nrpools(net);
490         if (npools == 0) {
491                 /*
492                  * NFS is shut down.  The admin can start it by
493                  * writing to the threads file but NOT the pool_threads
494                  * file, sorry.  Report zero threads.
495                  */
496                 mutex_unlock(&nfsd_mutex);
497                 strcpy(buf, "\n");
498                 return strlen(buf);
499         }
500 
501         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
502         rv = -ENOMEM;
503         if (nthreads == NULL)
504                 goto out_free;
505 
506         if (size > 0) {
507                 for (i = 0; i < npools; i++) {
508                         rv = get_int(&mesg, &nthreads[i]);
509                         if (rv == -ENOENT)
510                                 break;          /* fewer numbers than pools */
511                         if (rv)
512                                 goto out_free;  /* syntax error */
513                         rv = -EINVAL;
514                         if (nthreads[i] < 0)
515                                 goto out_free;
516                 }
517                 rv = nfsd_set_nrthreads(i, nthreads, net);
518                 if (rv)
519                         goto out_free;
520         }
521 
522         rv = nfsd_get_nrthreads(npools, nthreads, net);
523         if (rv)
524                 goto out_free;
525 
526         mesg = buf;
527         size = SIMPLE_TRANSACTION_LIMIT;
528         for (i = 0; i < npools && size > 0; i++) {
529                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
530                 len = strlen(mesg);
531                 size -= len;
532                 mesg += len;
533         }
534         rv = mesg - buf;
535 out_free:
536         kfree(nthreads);
537         mutex_unlock(&nfsd_mutex);
538         return rv;
539 }
540 
541 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
542 {
543         char *mesg = buf;
544         char *vers, *minorp, sign;
545         int len, num, remaining;
546         unsigned minor;
547         ssize_t tlen = 0;
548         char *sep;
549         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
550 
551         if (size>0) {
552                 if (nn->nfsd_serv)
553                         /* Cannot change versions without updating
554                          * nn->nfsd_serv->sv_xdrsize, and reallocing
555                          * rq_argp and rq_resp
556                          */
557                         return -EBUSY;
558                 if (buf[size-1] != '\n')
559                         return -EINVAL;
560                 buf[size-1] = 0;
561 
562                 vers = mesg;
563                 len = qword_get(&mesg, vers, size);
564                 if (len <= 0) return -EINVAL;
565                 do {
566                         sign = *vers;
567                         if (sign == '+' || sign == '-')
568                                 num = simple_strtol((vers+1), &minorp, 0);
569                         else
570                                 num = simple_strtol(vers, &minorp, 0);
571                         if (*minorp == '.') {
572                                 if (num != 4)
573                                         return -EINVAL;
574                                 minor = simple_strtoul(minorp+1, NULL, 0);
575                                 if (minor == 0)
576                                         return -EINVAL;
577                                 if (nfsd_minorversion(minor, sign == '-' ?
578                                                      NFSD_CLEAR : NFSD_SET) < 0)
579                                         return -EINVAL;
580                                 goto next;
581                         }
582                         switch(num) {
583                         case 2:
584                         case 3:
585                         case 4:
586                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
587                                 break;
588                         default:
589                                 return -EINVAL;
590                         }
591                 next:
592                         vers += len + 1;
593                 } while ((len = qword_get(&mesg, vers, size)) > 0);
594                 /* If all get turned off, turn them back on, as
595                  * having no versions is BAD
596                  */
597                 nfsd_reset_versions();
598         }
599 
600         /* Now write current state into reply buffer */
601         len = 0;
602         sep = "";
603         remaining = SIMPLE_TRANSACTION_LIMIT;
604         for (num=2 ; num <= 4 ; num++)
605                 if (nfsd_vers(num, NFSD_AVAIL)) {
606                         len = snprintf(buf, remaining, "%s%c%d", sep,
607                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
608                                        num);
609                         sep = " ";
610 
611                         if (len >= remaining)
612                                 break;
613                         remaining -= len;
614                         buf += len;
615                         tlen += len;
616                 }
617         if (nfsd_vers(4, NFSD_AVAIL))
618                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
619                      minor++) {
620                         len = snprintf(buf, remaining, " %c4.%u",
621                                         (nfsd_vers(4, NFSD_TEST) &&
622                                          nfsd_minorversion(minor, NFSD_TEST)) ?
623                                                 '+' : '-',
624                                         minor);
625 
626                         if (len >= remaining)
627                                 break;
628                         remaining -= len;
629                         buf += len;
630                         tlen += len;
631                 }
632 
633         len = snprintf(buf, remaining, "\n");
634         if (len >= remaining)
635                 return -EINVAL;
636         return tlen + len;
637 }
638 
639 /**
640  * write_versions - Set or report the available NFS protocol versions
641  *
642  * Input:
643  *                      buf:            ignored
644  *                      size:           zero
645  * Output:
646  *      On success:     passed-in buffer filled with '\n'-terminated C
647  *                      string containing positive or negative integer
648  *                      values representing the current status of each
649  *                      protocol version;
650  *                      return code is the size in bytes of the string
651  *      On error:       return code is zero or a negative errno value
652  *
653  * OR
654  *
655  * Input:
656  *                      buf:            C string containing whitespace-
657  *                                      separated positive or negative
658  *                                      integer values representing NFS
659  *                                      protocol versions to enable ("+n")
660  *                                      or disable ("-n")
661  *                      size:           non-zero length of C string in @buf
662  * Output:
663  *      On success:     status of zero or more protocol versions has
664  *                      been updated; passed-in buffer filled with
665  *                      '\n'-terminated C string containing positive
666  *                      or negative integer values representing the
667  *                      current status of each protocol version;
668  *                      return code is the size in bytes of the string
669  *      On error:       return code is zero or a negative errno value
670  */
671 static ssize_t write_versions(struct file *file, char *buf, size_t size)
672 {
673         ssize_t rv;
674 
675         mutex_lock(&nfsd_mutex);
676         rv = __write_versions(file, buf, size);
677         mutex_unlock(&nfsd_mutex);
678         return rv;
679 }
680 
681 /*
682  * Zero-length write.  Return a list of NFSD's current listener
683  * transports.
684  */
685 static ssize_t __write_ports_names(char *buf, struct net *net)
686 {
687         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
688 
689         if (nn->nfsd_serv == NULL)
690                 return 0;
691         return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
692 }
693 
694 /*
695  * A single 'fd' number was written, in which case it must be for
696  * a socket of a supported family/protocol, and we use it as an
697  * nfsd listener.
698  */
699 static ssize_t __write_ports_addfd(char *buf, struct net *net)
700 {
701         char *mesg = buf;
702         int fd, err;
703         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
704 
705         err = get_int(&mesg, &fd);
706         if (err != 0 || fd < 0)
707                 return -EINVAL;
708 
709         if (svc_alien_sock(net, fd)) {
710                 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
711                 return -EINVAL;
712         }
713 
714         err = nfsd_create_serv(net);
715         if (err != 0)
716                 return err;
717 
718         err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
719         if (err < 0) {
720                 nfsd_destroy(net);
721                 return err;
722         }
723 
724         /* Decrease the count, but don't shut down the service */
725         nn->nfsd_serv->sv_nrthreads--;
726         return err;
727 }
728 
729 /*
730  * A transport listener is added by writing it's transport name and
731  * a port number.
732  */
733 static ssize_t __write_ports_addxprt(char *buf, struct net *net)
734 {
735         char transport[16];
736         struct svc_xprt *xprt;
737         int port, err;
738         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
739 
740         if (sscanf(buf, "%15s %5u", transport, &port) != 2)
741                 return -EINVAL;
742 
743         if (port < 1 || port > USHRT_MAX)
744                 return -EINVAL;
745 
746         err = nfsd_create_serv(net);
747         if (err != 0)
748                 return err;
749 
750         err = svc_create_xprt(nn->nfsd_serv, transport, net,
751                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
752         if (err < 0)
753                 goto out_err;
754 
755         err = svc_create_xprt(nn->nfsd_serv, transport, net,
756                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
757         if (err < 0 && err != -EAFNOSUPPORT)
758                 goto out_close;
759 
760         /* Decrease the count, but don't shut down the service */
761         nn->nfsd_serv->sv_nrthreads--;
762         return 0;
763 out_close:
764         xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
765         if (xprt != NULL) {
766                 svc_close_xprt(xprt);
767                 svc_xprt_put(xprt);
768         }
769 out_err:
770         nfsd_destroy(net);
771         return err;
772 }
773 
774 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
775                              struct net *net)
776 {
777         if (size == 0)
778                 return __write_ports_names(buf, net);
779 
780         if (isdigit(buf[0]))
781                 return __write_ports_addfd(buf, net);
782 
783         if (isalpha(buf[0]))
784                 return __write_ports_addxprt(buf, net);
785 
786         return -EINVAL;
787 }
788 
789 /**
790  * write_ports - Pass a socket file descriptor or transport name to listen on
791  *
792  * Input:
793  *                      buf:            ignored
794  *                      size:           zero
795  * Output:
796  *      On success:     passed-in buffer filled with a '\n'-terminated C
797  *                      string containing a whitespace-separated list of
798  *                      named NFSD listeners;
799  *                      return code is the size in bytes of the string
800  *      On error:       return code is zero or a negative errno value
801  *
802  * OR
803  *
804  * Input:
805  *                      buf:            C string containing an unsigned
806  *                                      integer value representing a bound
807  *                                      but unconnected socket that is to be
808  *                                      used as an NFSD listener; listen(3)
809  *                                      must be called for a SOCK_STREAM
810  *                                      socket, otherwise it is ignored
811  *                      size:           non-zero length of C string in @buf
812  * Output:
813  *      On success:     NFS service is started;
814  *                      passed-in buffer filled with a '\n'-terminated C
815  *                      string containing a unique alphanumeric name of
816  *                      the listener;
817  *                      return code is the size in bytes of the string
818  *      On error:       return code is a negative errno value
819  *
820  * OR
821  *
822  * Input:
823  *                      buf:            C string containing a transport
824  *                                      name and an unsigned integer value
825  *                                      representing the port to listen on,
826  *                                      separated by whitespace
827  *                      size:           non-zero length of C string in @buf
828  * Output:
829  *      On success:     returns zero; NFS service is started
830  *      On error:       return code is a negative errno value
831  */
832 static ssize_t write_ports(struct file *file, char *buf, size_t size)
833 {
834         ssize_t rv;
835 
836         mutex_lock(&nfsd_mutex);
837         rv = __write_ports(file, buf, size, netns(file));
838         mutex_unlock(&nfsd_mutex);
839         return rv;
840 }
841 
842 
843 int nfsd_max_blksize;
844 
845 /**
846  * write_maxblksize - Set or report the current NFS blksize
847  *
848  * Input:
849  *                      buf:            ignored
850  *                      size:           zero
851  *
852  * OR
853  *
854  * Input:
855  *                      buf:            C string containing an unsigned
856  *                                      integer value representing the new
857  *                                      NFS blksize
858  *                      size:           non-zero length of C string in @buf
859  * Output:
860  *      On success:     passed-in buffer filled with '\n'-terminated C string
861  *                      containing numeric value of the current NFS blksize
862  *                      setting;
863  *                      return code is the size in bytes of the string
864  *      On error:       return code is zero or a negative errno value
865  */
866 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
867 {
868         char *mesg = buf;
869         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
870 
871         if (size > 0) {
872                 int bsize;
873                 int rv = get_int(&mesg, &bsize);
874                 if (rv)
875                         return rv;
876                 /* force bsize into allowed range and
877                  * required alignment.
878                  */
879                 bsize = max_t(int, bsize, 1024);
880                 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
881                 bsize &= ~(1024-1);
882                 mutex_lock(&nfsd_mutex);
883                 if (nn->nfsd_serv) {
884                         mutex_unlock(&nfsd_mutex);
885                         return -EBUSY;
886                 }
887                 nfsd_max_blksize = bsize;
888                 mutex_unlock(&nfsd_mutex);
889         }
890 
891         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
892                                                         nfsd_max_blksize);
893 }
894 
895 /**
896  * write_maxconn - Set or report the current max number of connections
897  *
898  * Input:
899  *                      buf:            ignored
900  *                      size:           zero
901  * OR
902  *
903  * Input:
904  *                      buf:            C string containing an unsigned
905  *                                      integer value representing the new
906  *                                      number of max connections
907  *                      size:           non-zero length of C string in @buf
908  * Output:
909  *      On success:     passed-in buffer filled with '\n'-terminated C string
910  *                      containing numeric value of max_connections setting
911  *                      for this net namespace;
912  *                      return code is the size in bytes of the string
913  *      On error:       return code is zero or a negative errno value
914  */
915 static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
916 {
917         char *mesg = buf;
918         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
919         unsigned int maxconn = nn->max_connections;
920 
921         if (size > 0) {
922                 int rv = get_uint(&mesg, &maxconn);
923 
924                 if (rv)
925                         return rv;
926                 nn->max_connections = maxconn;
927         }
928 
929         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
930 }
931 
932 #ifdef CONFIG_NFSD_V4
933 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
934                                   time_t *time, struct nfsd_net *nn)
935 {
936         char *mesg = buf;
937         int rv, i;
938 
939         if (size > 0) {
940                 if (nn->nfsd_serv)
941                         return -EBUSY;
942                 rv = get_int(&mesg, &i);
943                 if (rv)
944                         return rv;
945                 /*
946                  * Some sanity checking.  We don't have a reason for
947                  * these particular numbers, but problems with the
948                  * extremes are:
949                  *      - Too short: the briefest network outage may
950                  *        cause clients to lose all their locks.  Also,
951                  *        the frequent polling may be wasteful.
952                  *      - Too long: do you really want reboot recovery
953                  *        to take more than an hour?  Or to make other
954                  *        clients wait an hour before being able to
955                  *        revoke a dead client's locks?
956                  */
957                 if (i < 10 || i > 3600)
958                         return -EINVAL;
959                 *time = i;
960         }
961 
962         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
963 }
964 
965 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
966                                 time_t *time, struct nfsd_net *nn)
967 {
968         ssize_t rv;
969 
970         mutex_lock(&nfsd_mutex);
971         rv = __nfsd4_write_time(file, buf, size, time, nn);
972         mutex_unlock(&nfsd_mutex);
973         return rv;
974 }
975 
976 /**
977  * write_leasetime - Set or report the current NFSv4 lease time
978  *
979  * Input:
980  *                      buf:            ignored
981  *                      size:           zero
982  *
983  * OR
984  *
985  * Input:
986  *                      buf:            C string containing an unsigned
987  *                                      integer value representing the new
988  *                                      NFSv4 lease expiry time
989  *                      size:           non-zero length of C string in @buf
990  * Output:
991  *      On success:     passed-in buffer filled with '\n'-terminated C
992  *                      string containing unsigned integer value of the
993  *                      current lease expiry time;
994  *                      return code is the size in bytes of the string
995  *      On error:       return code is zero or a negative errno value
996  */
997 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
998 {
999         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1000         return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1001 }
1002 
1003 /**
1004  * write_gracetime - Set or report current NFSv4 grace period time
1005  *
1006  * As above, but sets the time of the NFSv4 grace period.
1007  *
1008  * Note this should never be set to less than the *previous*
1009  * lease-period time, but we don't try to enforce this.  (In the common
1010  * case (a new boot), we don't know what the previous lease time was
1011  * anyway.)
1012  */
1013 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1014 {
1015         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1016         return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1017 }
1018 
1019 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1020                                    struct nfsd_net *nn)
1021 {
1022         char *mesg = buf;
1023         char *recdir;
1024         int len, status;
1025 
1026         if (size > 0) {
1027                 if (nn->nfsd_serv)
1028                         return -EBUSY;
1029                 if (size > PATH_MAX || buf[size-1] != '\n')
1030                         return -EINVAL;
1031                 buf[size-1] = 0;
1032 
1033                 recdir = mesg;
1034                 len = qword_get(&mesg, recdir, size);
1035                 if (len <= 0)
1036                         return -EINVAL;
1037 
1038                 status = nfs4_reset_recoverydir(recdir);
1039                 if (status)
1040                         return status;
1041         }
1042 
1043         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1044                                                         nfs4_recoverydir());
1045 }
1046 
1047 /**
1048  * write_recoverydir - Set or report the pathname of the recovery directory
1049  *
1050  * Input:
1051  *                      buf:            ignored
1052  *                      size:           zero
1053  *
1054  * OR
1055  *
1056  * Input:
1057  *                      buf:            C string containing the pathname
1058  *                                      of the directory on a local file
1059  *                                      system containing permanent NFSv4
1060  *                                      recovery data
1061  *                      size:           non-zero length of C string in @buf
1062  * Output:
1063  *      On success:     passed-in buffer filled with '\n'-terminated C string
1064  *                      containing the current recovery pathname setting;
1065  *                      return code is the size in bytes of the string
1066  *      On error:       return code is zero or a negative errno value
1067  */
1068 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1069 {
1070         ssize_t rv;
1071         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1072 
1073         mutex_lock(&nfsd_mutex);
1074         rv = __write_recoverydir(file, buf, size, nn);
1075         mutex_unlock(&nfsd_mutex);
1076         return rv;
1077 }
1078 
1079 /**
1080  * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1081  *
1082  * Input:
1083  *                      buf:            ignored
1084  *                      size:           zero
1085  * OR
1086  *
1087  * Input:
1088  *                      buf:            any value
1089  *                      size:           non-zero length of C string in @buf
1090  * Output:
1091  *                      passed-in buffer filled with "Y" or "N" with a newline
1092  *                      and NULL-terminated C string. This indicates whether
1093  *                      the grace period has ended in the current net
1094  *                      namespace. Return code is the size in bytes of the
1095  *                      string. Writing a string that starts with 'Y', 'y', or
1096  *                      '1' to the file will end the grace period for nfsd's v4
1097  *                      lock manager.
1098  */
1099 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1100 {
1101         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1102 
1103         if (size > 0) {
1104                 switch(buf[0]) {
1105                 case 'Y':
1106                 case 'y':
1107                 case '1':
1108                         nfsd4_end_grace(nn);
1109                         break;
1110                 default:
1111                         return -EINVAL;
1112                 }
1113         }
1114 
1115         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1116                          nn->grace_ended ? 'Y' : 'N');
1117 }
1118 
1119 #endif
1120 
1121 /*----------------------------------------------------------------------------*/
1122 /*
1123  *      populating the filesystem.
1124  */
1125 
1126 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1127 {
1128         static struct tree_descr nfsd_files[] = {
1129                 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1130                 [NFSD_Export_features] = {"export_features",
1131                                         &export_features_operations, S_IRUGO},
1132                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1133                                         &transaction_ops, S_IWUSR|S_IRUSR},
1134                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1135                                         &transaction_ops, S_IWUSR|S_IRUSR},
1136                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1137                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1138                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1139                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1140                 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1141                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1142                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1143                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1144                 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1145 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1146                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1147 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1148 #ifdef CONFIG_NFSD_V4
1149                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1150                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1151                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1152                 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1153 #endif
1154                 /* last one */ {""}
1155         };
1156         struct net *net = data;
1157         int ret;
1158 
1159         ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1160         if (ret)
1161                 return ret;
1162         sb->s_fs_info = get_net(net);
1163         return 0;
1164 }
1165 
1166 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1167         int flags, const char *dev_name, void *data)
1168 {
1169         return mount_ns(fs_type, flags, current->nsproxy->net_ns, nfsd_fill_super);
1170 }
1171 
1172 static void nfsd_umount(struct super_block *sb)
1173 {
1174         struct net *net = sb->s_fs_info;
1175 
1176         kill_litter_super(sb);
1177         put_net(net);
1178 }
1179 
1180 static struct file_system_type nfsd_fs_type = {
1181         .owner          = THIS_MODULE,
1182         .name           = "nfsd",
1183         .mount          = nfsd_mount,
1184         .kill_sb        = nfsd_umount,
1185 };
1186 MODULE_ALIAS_FS("nfsd");
1187 
1188 #ifdef CONFIG_PROC_FS
1189 static int create_proc_exports_entry(void)
1190 {
1191         struct proc_dir_entry *entry;
1192 
1193         entry = proc_mkdir("fs/nfs", NULL);
1194         if (!entry)
1195                 return -ENOMEM;
1196         entry = proc_create("exports", 0, entry,
1197                                  &exports_proc_operations);
1198         if (!entry) {
1199                 remove_proc_entry("fs/nfs", NULL);
1200                 return -ENOMEM;
1201         }
1202         return 0;
1203 }
1204 #else /* CONFIG_PROC_FS */
1205 static int create_proc_exports_entry(void)
1206 {
1207         return 0;
1208 }
1209 #endif
1210 
1211 int nfsd_net_id;
1212 
1213 static __net_init int nfsd_init_net(struct net *net)
1214 {
1215         int retval;
1216         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1217 
1218         retval = nfsd_export_init(net);
1219         if (retval)
1220                 goto out_export_error;
1221         retval = nfsd_idmap_init(net);
1222         if (retval)
1223                 goto out_idmap_error;
1224         nn->nfsd4_lease = 90;   /* default lease time */
1225         nn->nfsd4_grace = 90;
1226         return 0;
1227 
1228 out_idmap_error:
1229         nfsd_export_shutdown(net);
1230 out_export_error:
1231         return retval;
1232 }
1233 
1234 static __net_exit void nfsd_exit_net(struct net *net)
1235 {
1236         nfsd_idmap_shutdown(net);
1237         nfsd_export_shutdown(net);
1238 }
1239 
1240 static struct pernet_operations nfsd_net_ops = {
1241         .init = nfsd_init_net,
1242         .exit = nfsd_exit_net,
1243         .id   = &nfsd_net_id,
1244         .size = sizeof(struct nfsd_net),
1245 };
1246 
1247 static int __init init_nfsd(void)
1248 {
1249         int retval;
1250         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1251 
1252         retval = register_cld_notifier();
1253         if (retval)
1254                 return retval;
1255         retval = register_pernet_subsys(&nfsd_net_ops);
1256         if (retval < 0)
1257                 goto out_unregister_notifier;
1258         retval = nfsd4_init_slabs();
1259         if (retval)
1260                 goto out_unregister_pernet;
1261         retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1262         if (retval)
1263                 goto out_free_slabs;
1264         nfsd_stat_init();       /* Statistics */
1265         retval = nfsd_reply_cache_init();
1266         if (retval)
1267                 goto out_free_stat;
1268         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1269         retval = create_proc_exports_entry();
1270         if (retval)
1271                 goto out_free_lockd;
1272         retval = register_filesystem(&nfsd_fs_type);
1273         if (retval)
1274                 goto out_free_all;
1275         return 0;
1276 out_free_all:
1277         remove_proc_entry("fs/nfs/exports", NULL);
1278         remove_proc_entry("fs/nfs", NULL);
1279 out_free_lockd:
1280         nfsd_lockd_shutdown();
1281         nfsd_reply_cache_shutdown();
1282 out_free_stat:
1283         nfsd_stat_shutdown();
1284         nfsd_fault_inject_cleanup();
1285 out_free_slabs:
1286         nfsd4_free_slabs();
1287 out_unregister_pernet:
1288         unregister_pernet_subsys(&nfsd_net_ops);
1289 out_unregister_notifier:
1290         unregister_cld_notifier();
1291         return retval;
1292 }
1293 
1294 static void __exit exit_nfsd(void)
1295 {
1296         nfsd_reply_cache_shutdown();
1297         remove_proc_entry("fs/nfs/exports", NULL);
1298         remove_proc_entry("fs/nfs", NULL);
1299         nfsd_stat_shutdown();
1300         nfsd_lockd_shutdown();
1301         nfsd4_free_slabs();
1302         nfsd_fault_inject_cleanup();
1303         unregister_filesystem(&nfsd_fs_type);
1304         unregister_pernet_subsys(&nfsd_net_ops);
1305         unregister_cld_notifier();
1306 }
1307 
1308 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1309 MODULE_LICENSE("GPL");
1310 module_init(init_nfsd)
1311 module_exit(exit_nfsd)
1312 

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