Version:  2.0.40 2.2.26 2.4.37 3.1 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

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

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