Version:  2.0.40 2.2.26 2.4.37 3.2 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

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 
235 /**
236  * write_unlock_ip - Release all locks used by a client
237  *
238  * Experimental.
239  *
240  * Input:
241  *                      buf:    '\n'-terminated C string containing a
242  *                              presentation format IP address
243  *                      size:   length of C string in @buf
244  * Output:
245  *      On success:     returns zero if all specified locks were released;
246  *                      returns one if one or more locks were not released
247  *      On error:       return code is negative errno value
248  */
249 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
250 {
251         struct sockaddr_storage address;
252         struct sockaddr *sap = (struct sockaddr *)&address;
253         size_t salen = sizeof(address);
254         char *fo_path;
255         struct net *net = file->f_dentry->d_sb->s_fs_info;
256 
257         /* sanity check */
258         if (size == 0)
259                 return -EINVAL;
260 
261         if (buf[size-1] != '\n')
262                 return -EINVAL;
263 
264         fo_path = buf;
265         if (qword_get(&buf, fo_path, size) < 0)
266                 return -EINVAL;
267 
268         if (rpc_pton(net, fo_path, size, sap, salen) == 0)
269                 return -EINVAL;
270 
271         return nlmsvc_unlock_all_by_ip(sap);
272 }
273 
274 /**
275  * write_unlock_fs - Release all locks on a local file system
276  *
277  * Experimental.
278  *
279  * Input:
280  *                      buf:    '\n'-terminated C string containing the
281  *                              absolute pathname of a local file system
282  *                      size:   length of C string in @buf
283  * Output:
284  *      On success:     returns zero if all specified locks were released;
285  *                      returns one if one or more locks were not released
286  *      On error:       return code is negative errno value
287  */
288 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
289 {
290         struct path path;
291         char *fo_path;
292         int error;
293 
294         /* sanity check */
295         if (size == 0)
296                 return -EINVAL;
297 
298         if (buf[size-1] != '\n')
299                 return -EINVAL;
300 
301         fo_path = buf;
302         if (qword_get(&buf, fo_path, size) < 0)
303                 return -EINVAL;
304 
305         error = kern_path(fo_path, 0, &path);
306         if (error)
307                 return error;
308 
309         /*
310          * XXX: Needs better sanity checking.  Otherwise we could end up
311          * releasing locks on the wrong file system.
312          *
313          * For example:
314          * 1.  Does the path refer to a directory?
315          * 2.  Is that directory a mount point, or
316          * 3.  Is that directory the root of an exported file system?
317          */
318         error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
319 
320         path_put(&path);
321         return error;
322 }
323 
324 /**
325  * write_filehandle - Get a variable-length NFS file handle by path
326  *
327  * On input, the buffer contains a '\n'-terminated C string comprised of
328  * three alphanumeric words separated by whitespace.  The string may
329  * contain escape sequences.
330  *
331  * Input:
332  *                      buf:
333  *                              domain:         client domain name
334  *                              path:           export pathname
335  *                              maxsize:        numeric maximum size of
336  *                                              @buf
337  *                      size:   length of C string in @buf
338  * Output:
339  *      On success:     passed-in buffer filled with '\n'-terminated C
340  *                      string containing a ASCII hex text version
341  *                      of the NFS file handle;
342  *                      return code is the size in bytes of the string
343  *      On error:       return code is negative errno value
344  */
345 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
346 {
347         char *dname, *path;
348         int uninitialized_var(maxsize);
349         char *mesg = buf;
350         int len;
351         struct auth_domain *dom;
352         struct knfsd_fh fh;
353         struct net *net = file->f_dentry->d_sb->s_fs_info;
354 
355         if (size == 0)
356                 return -EINVAL;
357 
358         if (buf[size-1] != '\n')
359                 return -EINVAL;
360         buf[size-1] = 0;
361 
362         dname = mesg;
363         len = qword_get(&mesg, dname, size);
364         if (len <= 0)
365                 return -EINVAL;
366         
367         path = dname+len+1;
368         len = qword_get(&mesg, path, size);
369         if (len <= 0)
370                 return -EINVAL;
371 
372         len = get_int(&mesg, &maxsize);
373         if (len)
374                 return len;
375 
376         if (maxsize < NFS_FHSIZE)
377                 return -EINVAL;
378         maxsize = min(maxsize, NFS3_FHSIZE);
379 
380         if (qword_get(&mesg, mesg, size)>0)
381                 return -EINVAL;
382 
383         /* we have all the words, they are in buf.. */
384         dom = unix_domain_find(dname);
385         if (!dom)
386                 return -ENOMEM;
387 
388         len = exp_rootfh(net, dom, path, &fh,  maxsize);
389         auth_domain_put(dom);
390         if (len)
391                 return len;
392         
393         mesg = buf;
394         len = SIMPLE_TRANSACTION_LIMIT;
395         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
396         mesg[-1] = '\n';
397         return mesg - buf;      
398 }
399 
400 /**
401  * write_threads - Start NFSD, or report the current number of running threads
402  *
403  * Input:
404  *                      buf:            ignored
405  *                      size:           zero
406  * Output:
407  *      On success:     passed-in buffer filled with '\n'-terminated C
408  *                      string numeric value representing the number of
409  *                      running NFSD threads;
410  *                      return code is the size in bytes of the string
411  *      On error:       return code is zero
412  *
413  * OR
414  *
415  * Input:
416  *                      buf:            C string containing an unsigned
417  *                                      integer value representing the
418  *                                      number of NFSD threads to start
419  *                      size:           non-zero length of C string in @buf
420  * Output:
421  *      On success:     NFS service is started;
422  *                      passed-in buffer filled with '\n'-terminated C
423  *                      string numeric value representing the number of
424  *                      running NFSD threads;
425  *                      return code is the size in bytes of the string
426  *      On error:       return code is zero or a negative errno value
427  */
428 static ssize_t write_threads(struct file *file, char *buf, size_t size)
429 {
430         char *mesg = buf;
431         int rv;
432         struct net *net = file->f_dentry->d_sb->s_fs_info;
433 
434         if (size > 0) {
435                 int newthreads;
436                 rv = get_int(&mesg, &newthreads);
437                 if (rv)
438                         return rv;
439                 if (newthreads < 0)
440                         return -EINVAL;
441                 rv = nfsd_svc(newthreads, net);
442                 if (rv < 0)
443                         return rv;
444         } else
445                 rv = nfsd_nrthreads(net);
446 
447         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
448 }
449 
450 /**
451  * write_pool_threads - Set or report the current number of threads per pool
452  *
453  * Input:
454  *                      buf:            ignored
455  *                      size:           zero
456  *
457  * OR
458  *
459  * Input:
460  *                      buf:            C string containing whitespace-
461  *                                      separated unsigned integer values
462  *                                      representing the number of NFSD
463  *                                      threads to start in each pool
464  *                      size:           non-zero length of C string in @buf
465  * Output:
466  *      On success:     passed-in buffer filled with '\n'-terminated C
467  *                      string containing integer values representing the
468  *                      number of NFSD threads in each pool;
469  *                      return code is the size in bytes of the string
470  *      On error:       return code is zero or a negative errno value
471  */
472 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
473 {
474         /* if size > 0, look for an array of number of threads per node
475          * and apply them  then write out number of threads per node as reply
476          */
477         char *mesg = buf;
478         int i;
479         int rv;
480         int len;
481         int npools;
482         int *nthreads;
483         struct net *net = file->f_dentry->d_sb->s_fs_info;
484 
485         mutex_lock(&nfsd_mutex);
486         npools = nfsd_nrpools(net);
487         if (npools == 0) {
488                 /*
489                  * NFS is shut down.  The admin can start it by
490                  * writing to the threads file but NOT the pool_threads
491                  * file, sorry.  Report zero threads.
492                  */
493                 mutex_unlock(&nfsd_mutex);
494                 strcpy(buf, "\n");
495                 return strlen(buf);
496         }
497 
498         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
499         rv = -ENOMEM;
500         if (nthreads == NULL)
501                 goto out_free;
502 
503         if (size > 0) {
504                 for (i = 0; i < npools; i++) {
505                         rv = get_int(&mesg, &nthreads[i]);
506                         if (rv == -ENOENT)
507                                 break;          /* fewer numbers than pools */
508                         if (rv)
509                                 goto out_free;  /* syntax error */
510                         rv = -EINVAL;
511                         if (nthreads[i] < 0)
512                                 goto out_free;
513                 }
514                 rv = nfsd_set_nrthreads(i, nthreads, net);
515                 if (rv)
516                         goto out_free;
517         }
518 
519         rv = nfsd_get_nrthreads(npools, nthreads, net);
520         if (rv)
521                 goto out_free;
522 
523         mesg = buf;
524         size = SIMPLE_TRANSACTION_LIMIT;
525         for (i = 0; i < npools && size > 0; i++) {
526                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
527                 len = strlen(mesg);
528                 size -= len;
529                 mesg += len;
530         }
531         rv = mesg - buf;
532 out_free:
533         kfree(nthreads);
534         mutex_unlock(&nfsd_mutex);
535         return rv;
536 }
537 
538 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
539 {
540         char *mesg = buf;
541         char *vers, *minorp, sign;
542         int len, num, remaining;
543         unsigned minor;
544         ssize_t tlen = 0;
545         char *sep;
546         struct net *net = file->f_dentry->d_sb->s_fs_info;
547         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
548 
549         if (size>0) {
550                 if (nn->nfsd_serv)
551                         /* Cannot change versions without updating
552                          * nn->nfsd_serv->sv_xdrsize, and reallocing
553                          * rq_argp and rq_resp
554                          */
555                         return -EBUSY;
556                 if (buf[size-1] != '\n')
557                         return -EINVAL;
558                 buf[size-1] = 0;
559 
560                 vers = mesg;
561                 len = qword_get(&mesg, vers, size);
562                 if (len <= 0) return -EINVAL;
563                 do {
564                         sign = *vers;
565                         if (sign == '+' || sign == '-')
566                                 num = simple_strtol((vers+1), &minorp, 0);
567                         else
568                                 num = simple_strtol(vers, &minorp, 0);
569                         if (*minorp == '.') {
570                                 if (num != 4)
571                                         return -EINVAL;
572                                 minor = simple_strtoul(minorp+1, NULL, 0);
573                                 if (minor == 0)
574                                         return -EINVAL;
575                                 if (nfsd_minorversion(minor, sign == '-' ?
576                                                      NFSD_CLEAR : NFSD_SET) < 0)
577                                         return -EINVAL;
578                                 goto next;
579                         }
580                         switch(num) {
581                         case 2:
582                         case 3:
583                         case 4:
584                                 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
585                                 break;
586                         default:
587                                 return -EINVAL;
588                         }
589                 next:
590                         vers += len + 1;
591                 } while ((len = qword_get(&mesg, vers, size)) > 0);
592                 /* If all get turned off, turn them back on, as
593                  * having no versions is BAD
594                  */
595                 nfsd_reset_versions();
596         }
597 
598         /* Now write current state into reply buffer */
599         len = 0;
600         sep = "";
601         remaining = SIMPLE_TRANSACTION_LIMIT;
602         for (num=2 ; num <= 4 ; num++)
603                 if (nfsd_vers(num, NFSD_AVAIL)) {
604                         len = snprintf(buf, remaining, "%s%c%d", sep,
605                                        nfsd_vers(num, NFSD_TEST)?'+':'-',
606                                        num);
607                         sep = " ";
608 
609                         if (len > remaining)
610                                 break;
611                         remaining -= len;
612                         buf += len;
613                         tlen += len;
614                 }
615         if (nfsd_vers(4, NFSD_AVAIL))
616                 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
617                      minor++) {
618                         len = snprintf(buf, remaining, " %c4.%u",
619                                         (nfsd_vers(4, NFSD_TEST) &&
620                                          nfsd_minorversion(minor, NFSD_TEST)) ?
621                                                 '+' : '-',
622                                         minor);
623 
624                         if (len > remaining)
625                                 break;
626                         remaining -= len;
627                         buf += len;
628                         tlen += len;
629                 }
630 
631         len = snprintf(buf, remaining, "\n");
632         if (len > remaining)
633                 return -EINVAL;
634         return tlen + len;
635 }
636 
637 /**
638  * write_versions - Set or report the available NFS protocol versions
639  *
640  * Input:
641  *                      buf:            ignored
642  *                      size:           zero
643  * Output:
644  *      On success:     passed-in buffer filled with '\n'-terminated C
645  *                      string containing positive or negative integer
646  *                      values representing the current status of each
647  *                      protocol version;
648  *                      return code is the size in bytes of the string
649  *      On error:       return code is zero or a negative errno value
650  *
651  * OR
652  *
653  * Input:
654  *                      buf:            C string containing whitespace-
655  *                                      separated positive or negative
656  *                                      integer values representing NFS
657  *                                      protocol versions to enable ("+n")
658  *                                      or disable ("-n")
659  *                      size:           non-zero length of C string in @buf
660  * Output:
661  *      On success:     status of zero or more protocol versions has
662  *                      been updated; passed-in buffer filled with
663  *                      '\n'-terminated C string containing positive
664  *                      or negative integer values representing the
665  *                      current status of each protocol version;
666  *                      return code is the size in bytes of the string
667  *      On error:       return code is zero or a negative errno value
668  */
669 static ssize_t write_versions(struct file *file, char *buf, size_t size)
670 {
671         ssize_t rv;
672 
673         mutex_lock(&nfsd_mutex);
674         rv = __write_versions(file, buf, size);
675         mutex_unlock(&nfsd_mutex);
676         return rv;
677 }
678 
679 /*
680  * Zero-length write.  Return a list of NFSD's current listener
681  * transports.
682  */
683 static ssize_t __write_ports_names(char *buf, struct net *net)
684 {
685         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
686 
687         if (nn->nfsd_serv == NULL)
688                 return 0;
689         return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
690 }
691 
692 /*
693  * A single 'fd' number was written, in which case it must be for
694  * a socket of a supported family/protocol, and we use it as an
695  * nfsd listener.
696  */
697 static ssize_t __write_ports_addfd(char *buf, struct net *net)
698 {
699         char *mesg = buf;
700         int fd, err;
701         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
702 
703         err = get_int(&mesg, &fd);
704         if (err != 0 || fd < 0)
705                 return -EINVAL;
706 
707         if (svc_alien_sock(net, fd)) {
708                 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
709                 return -EINVAL;
710         }
711 
712         err = nfsd_create_serv(net);
713         if (err != 0)
714                 return err;
715 
716         err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
717         if (err < 0) {
718                 nfsd_destroy(net);
719                 return err;
720         }
721 
722         /* Decrease the count, but don't shut down the service */
723         nn->nfsd_serv->sv_nrthreads--;
724         return err;
725 }
726 
727 /*
728  * A transport listener is added by writing it's transport name and
729  * a port number.
730  */
731 static ssize_t __write_ports_addxprt(char *buf, struct net *net)
732 {
733         char transport[16];
734         struct svc_xprt *xprt;
735         int port, err;
736         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
737 
738         if (sscanf(buf, "%15s %5u", transport, &port) != 2)
739                 return -EINVAL;
740 
741         if (port < 1 || port > USHRT_MAX)
742                 return -EINVAL;
743 
744         err = nfsd_create_serv(net);
745         if (err != 0)
746                 return err;
747 
748         err = svc_create_xprt(nn->nfsd_serv, transport, net,
749                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
750         if (err < 0)
751                 goto out_err;
752 
753         err = svc_create_xprt(nn->nfsd_serv, transport, net,
754                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
755         if (err < 0 && err != -EAFNOSUPPORT)
756                 goto out_close;
757 
758         /* Decrease the count, but don't shut down the service */
759         nn->nfsd_serv->sv_nrthreads--;
760         return 0;
761 out_close:
762         xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
763         if (xprt != NULL) {
764                 svc_close_xprt(xprt);
765                 svc_xprt_put(xprt);
766         }
767 out_err:
768         nfsd_destroy(net);
769         return err;
770 }
771 
772 static ssize_t __write_ports(struct file *file, char *buf, size_t size,
773                              struct net *net)
774 {
775         if (size == 0)
776                 return __write_ports_names(buf, net);
777 
778         if (isdigit(buf[0]))
779                 return __write_ports_addfd(buf, net);
780 
781         if (isalpha(buf[0]))
782                 return __write_ports_addxprt(buf, net);
783 
784         return -EINVAL;
785 }
786 
787 /**
788  * write_ports - Pass a socket file descriptor or transport name to listen on
789  *
790  * Input:
791  *                      buf:            ignored
792  *                      size:           zero
793  * Output:
794  *      On success:     passed-in buffer filled with a '\n'-terminated C
795  *                      string containing a whitespace-separated list of
796  *                      named NFSD listeners;
797  *                      return code is the size in bytes of the string
798  *      On error:       return code is zero or a negative errno value
799  *
800  * OR
801  *
802  * Input:
803  *                      buf:            C string containing an unsigned
804  *                                      integer value representing a bound
805  *                                      but unconnected socket that is to be
806  *                                      used as an NFSD listener; listen(3)
807  *                                      must be called for a SOCK_STREAM
808  *                                      socket, otherwise it is ignored
809  *                      size:           non-zero length of C string in @buf
810  * Output:
811  *      On success:     NFS service is started;
812  *                      passed-in buffer filled with a '\n'-terminated C
813  *                      string containing a unique alphanumeric name of
814  *                      the listener;
815  *                      return code is the size in bytes of the string
816  *      On error:       return code is a negative errno value
817  *
818  * OR
819  *
820  * Input:
821  *                      buf:            C string containing a transport
822  *                                      name and an unsigned integer value
823  *                                      representing the port to listen on,
824  *                                      separated by whitespace
825  *                      size:           non-zero length of C string in @buf
826  * Output:
827  *      On success:     returns zero; NFS service is started
828  *      On error:       return code is a negative errno value
829  */
830 static ssize_t write_ports(struct file *file, char *buf, size_t size)
831 {
832         ssize_t rv;
833         struct net *net = file->f_dentry->d_sb->s_fs_info;
834 
835         mutex_lock(&nfsd_mutex);
836         rv = __write_ports(file, buf, size, net);
837         mutex_unlock(&nfsd_mutex);
838         return rv;
839 }
840 
841 
842 int nfsd_max_blksize;
843 
844 /**
845  * write_maxblksize - Set or report the current NFS blksize
846  *
847  * Input:
848  *                      buf:            ignored
849  *                      size:           zero
850  *
851  * OR
852  *
853  * Input:
854  *                      buf:            C string containing an unsigned
855  *                                      integer value representing the new
856  *                                      NFS blksize
857  *                      size:           non-zero length of C string in @buf
858  * Output:
859  *      On success:     passed-in buffer filled with '\n'-terminated C string
860  *                      containing numeric value of the current NFS blksize
861  *                      setting;
862  *                      return code is the size in bytes of the string
863  *      On error:       return code is zero or a negative errno value
864  */
865 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
866 {
867         char *mesg = buf;
868         struct net *net = file->f_dentry->d_sb->s_fs_info;
869         struct nfsd_net *nn = net_generic(net, 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 net *net = file->f_dentry->d_sb->s_fs_info;
919         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
920         unsigned int maxconn = nn->max_connections;
921 
922         if (size > 0) {
923                 int rv = get_uint(&mesg, &maxconn);
924 
925                 if (rv)
926                         return rv;
927                 nn->max_connections = maxconn;
928         }
929 
930         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
931 }
932 
933 #ifdef CONFIG_NFSD_V4
934 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
935                                   time_t *time, struct nfsd_net *nn)
936 {
937         char *mesg = buf;
938         int rv, i;
939 
940         if (size > 0) {
941                 if (nn->nfsd_serv)
942                         return -EBUSY;
943                 rv = get_int(&mesg, &i);
944                 if (rv)
945                         return rv;
946                 /*
947                  * Some sanity checking.  We don't have a reason for
948                  * these particular numbers, but problems with the
949                  * extremes are:
950                  *      - Too short: the briefest network outage may
951                  *        cause clients to lose all their locks.  Also,
952                  *        the frequent polling may be wasteful.
953                  *      - Too long: do you really want reboot recovery
954                  *        to take more than an hour?  Or to make other
955                  *        clients wait an hour before being able to
956                  *        revoke a dead client's locks?
957                  */
958                 if (i < 10 || i > 3600)
959                         return -EINVAL;
960                 *time = i;
961         }
962 
963         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
964 }
965 
966 static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
967                                 time_t *time, struct nfsd_net *nn)
968 {
969         ssize_t rv;
970 
971         mutex_lock(&nfsd_mutex);
972         rv = __nfsd4_write_time(file, buf, size, time, nn);
973         mutex_unlock(&nfsd_mutex);
974         return rv;
975 }
976 
977 /**
978  * write_leasetime - Set or report the current NFSv4 lease time
979  *
980  * Input:
981  *                      buf:            ignored
982  *                      size:           zero
983  *
984  * OR
985  *
986  * Input:
987  *                      buf:            C string containing an unsigned
988  *                                      integer value representing the new
989  *                                      NFSv4 lease expiry time
990  *                      size:           non-zero length of C string in @buf
991  * Output:
992  *      On success:     passed-in buffer filled with '\n'-terminated C
993  *                      string containing unsigned integer value of the
994  *                      current lease expiry time;
995  *                      return code is the size in bytes of the string
996  *      On error:       return code is zero or a negative errno value
997  */
998 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
999 {
1000         struct net *net = file->f_dentry->d_sb->s_fs_info;
1001         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1002         return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1003 }
1004 
1005 /**
1006  * write_gracetime - Set or report current NFSv4 grace period time
1007  *
1008  * As above, but sets the time of the NFSv4 grace period.
1009  *
1010  * Note this should never be set to less than the *previous*
1011  * lease-period time, but we don't try to enforce this.  (In the common
1012  * case (a new boot), we don't know what the previous lease time was
1013  * anyway.)
1014  */
1015 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1016 {
1017         struct net *net = file->f_dentry->d_sb->s_fs_info;
1018         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1019         return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1020 }
1021 
1022 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1023                                    struct nfsd_net *nn)
1024 {
1025         char *mesg = buf;
1026         char *recdir;
1027         int len, status;
1028 
1029         if (size > 0) {
1030                 if (nn->nfsd_serv)
1031                         return -EBUSY;
1032                 if (size > PATH_MAX || buf[size-1] != '\n')
1033                         return -EINVAL;
1034                 buf[size-1] = 0;
1035 
1036                 recdir = mesg;
1037                 len = qword_get(&mesg, recdir, size);
1038                 if (len <= 0)
1039                         return -EINVAL;
1040 
1041                 status = nfs4_reset_recoverydir(recdir);
1042                 if (status)
1043                         return status;
1044         }
1045 
1046         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1047                                                         nfs4_recoverydir());
1048 }
1049 
1050 /**
1051  * write_recoverydir - Set or report the pathname of the recovery directory
1052  *
1053  * Input:
1054  *                      buf:            ignored
1055  *                      size:           zero
1056  *
1057  * OR
1058  *
1059  * Input:
1060  *                      buf:            C string containing the pathname
1061  *                                      of the directory on a local file
1062  *                                      system containing permanent NFSv4
1063  *                                      recovery data
1064  *                      size:           non-zero length of C string in @buf
1065  * Output:
1066  *      On success:     passed-in buffer filled with '\n'-terminated C string
1067  *                      containing the current recovery pathname setting;
1068  *                      return code is the size in bytes of the string
1069  *      On error:       return code is zero or a negative errno value
1070  */
1071 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1072 {
1073         ssize_t rv;
1074         struct net *net = file->f_dentry->d_sb->s_fs_info;
1075         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1076 
1077         mutex_lock(&nfsd_mutex);
1078         rv = __write_recoverydir(file, buf, size, nn);
1079         mutex_unlock(&nfsd_mutex);
1080         return rv;
1081 }
1082 
1083 /**
1084  * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1085  *
1086  * Input:
1087  *                      buf:            ignored
1088  *                      size:           zero
1089  * OR
1090  *
1091  * Input:
1092  *                      buf:            any value
1093  *                      size:           non-zero length of C string in @buf
1094  * Output:
1095  *                      passed-in buffer filled with "Y" or "N" with a newline
1096  *                      and NULL-terminated C string. This indicates whether
1097  *                      the grace period has ended in the current net
1098  *                      namespace. Return code is the size in bytes of the
1099  *                      string. Writing a string that starts with 'Y', 'y', or
1100  *                      '1' to the file will end the grace period for nfsd's v4
1101  *                      lock manager.
1102  */
1103 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1104 {
1105         struct net *net = file->f_dentry->d_sb->s_fs_info;
1106         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1107 
1108         if (size > 0) {
1109                 switch(buf[0]) {
1110                 case 'Y':
1111                 case 'y':
1112                 case '1':
1113                         nfsd4_end_grace(nn);
1114                         break;
1115                 default:
1116                         return -EINVAL;
1117                 }
1118         }
1119 
1120         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1121                          nn->grace_ended ? 'Y' : 'N');
1122 }
1123 
1124 #endif
1125 
1126 /*----------------------------------------------------------------------------*/
1127 /*
1128  *      populating the filesystem.
1129  */
1130 
1131 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1132 {
1133         static struct tree_descr nfsd_files[] = {
1134                 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1135                 [NFSD_Export_features] = {"export_features",
1136                                         &export_features_operations, S_IRUGO},
1137                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1138                                         &transaction_ops, S_IWUSR|S_IRUSR},
1139                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1140                                         &transaction_ops, S_IWUSR|S_IRUSR},
1141                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1142                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1143                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1144                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1145                 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1146                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1147                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1148                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1149                 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1150 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1151                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1152 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1153 #ifdef CONFIG_NFSD_V4
1154                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1155                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1156                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1157                 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1158 #endif
1159                 /* last one */ {""}
1160         };
1161         struct net *net = data;
1162         int ret;
1163 
1164         ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1165         if (ret)
1166                 return ret;
1167         sb->s_fs_info = get_net(net);
1168         return 0;
1169 }
1170 
1171 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1172         int flags, const char *dev_name, void *data)
1173 {
1174         return mount_ns(fs_type, flags, current->nsproxy->net_ns, nfsd_fill_super);
1175 }
1176 
1177 static void nfsd_umount(struct super_block *sb)
1178 {
1179         struct net *net = sb->s_fs_info;
1180 
1181         kill_litter_super(sb);
1182         put_net(net);
1183 }
1184 
1185 static struct file_system_type nfsd_fs_type = {
1186         .owner          = THIS_MODULE,
1187         .name           = "nfsd",
1188         .mount          = nfsd_mount,
1189         .kill_sb        = nfsd_umount,
1190 };
1191 MODULE_ALIAS_FS("nfsd");
1192 
1193 #ifdef CONFIG_PROC_FS
1194 static int create_proc_exports_entry(void)
1195 {
1196         struct proc_dir_entry *entry;
1197 
1198         entry = proc_mkdir("fs/nfs", NULL);
1199         if (!entry)
1200                 return -ENOMEM;
1201         entry = proc_create("exports", 0, entry,
1202                                  &exports_proc_operations);
1203         if (!entry) {
1204                 remove_proc_entry("fs/nfs", NULL);
1205                 return -ENOMEM;
1206         }
1207         return 0;
1208 }
1209 #else /* CONFIG_PROC_FS */
1210 static int create_proc_exports_entry(void)
1211 {
1212         return 0;
1213 }
1214 #endif
1215 
1216 int nfsd_net_id;
1217 
1218 static __net_init int nfsd_init_net(struct net *net)
1219 {
1220         int retval;
1221         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1222 
1223         retval = nfsd_export_init(net);
1224         if (retval)
1225                 goto out_export_error;
1226         retval = nfsd_idmap_init(net);
1227         if (retval)
1228                 goto out_idmap_error;
1229         nn->nfsd4_lease = 90;   /* default lease time */
1230         nn->nfsd4_grace = 90;
1231         return 0;
1232 
1233 out_idmap_error:
1234         nfsd_export_shutdown(net);
1235 out_export_error:
1236         return retval;
1237 }
1238 
1239 static __net_exit void nfsd_exit_net(struct net *net)
1240 {
1241         nfsd_idmap_shutdown(net);
1242         nfsd_export_shutdown(net);
1243 }
1244 
1245 static struct pernet_operations nfsd_net_ops = {
1246         .init = nfsd_init_net,
1247         .exit = nfsd_exit_net,
1248         .id   = &nfsd_net_id,
1249         .size = sizeof(struct nfsd_net),
1250 };
1251 
1252 static int __init init_nfsd(void)
1253 {
1254         int retval;
1255         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1256 
1257         retval = register_cld_notifier();
1258         if (retval)
1259                 return retval;
1260         retval = register_pernet_subsys(&nfsd_net_ops);
1261         if (retval < 0)
1262                 goto out_unregister_notifier;
1263         retval = nfsd4_init_slabs();
1264         if (retval)
1265                 goto out_unregister_pernet;
1266         retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1267         if (retval)
1268                 goto out_free_slabs;
1269         nfsd_stat_init();       /* Statistics */
1270         retval = nfsd_reply_cache_init();
1271         if (retval)
1272                 goto out_free_stat;
1273         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1274         retval = create_proc_exports_entry();
1275         if (retval)
1276                 goto out_free_lockd;
1277         retval = register_filesystem(&nfsd_fs_type);
1278         if (retval)
1279                 goto out_free_all;
1280         return 0;
1281 out_free_all:
1282         remove_proc_entry("fs/nfs/exports", NULL);
1283         remove_proc_entry("fs/nfs", NULL);
1284 out_free_lockd:
1285         nfsd_lockd_shutdown();
1286         nfsd_reply_cache_shutdown();
1287 out_free_stat:
1288         nfsd_stat_shutdown();
1289         nfsd_fault_inject_cleanup();
1290 out_free_slabs:
1291         nfsd4_free_slabs();
1292 out_unregister_pernet:
1293         unregister_pernet_subsys(&nfsd_net_ops);
1294 out_unregister_notifier:
1295         unregister_cld_notifier();
1296         return retval;
1297 }
1298 
1299 static void __exit exit_nfsd(void)
1300 {
1301         nfsd_reply_cache_shutdown();
1302         remove_proc_entry("fs/nfs/exports", NULL);
1303         remove_proc_entry("fs/nfs", NULL);
1304         nfsd_stat_shutdown();
1305         nfsd_lockd_shutdown();
1306         nfsd4_free_slabs();
1307         nfsd_fault_inject_cleanup();
1308         unregister_filesystem(&nfsd_fs_type);
1309         unregister_pernet_subsys(&nfsd_net_ops);
1310         unregister_cld_notifier();
1311 }
1312 
1313 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1314 MODULE_LICENSE("GPL");
1315 module_init(init_nfsd)
1316 module_exit(exit_nfsd)
1317 

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