Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

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 #include "pnfs.h"
 25 
 26 /*
 27  *      We have a single directory with several nodes in it.
 28  */
 29 enum {
 30         NFSD_Root = 1,
 31         NFSD_List,
 32         NFSD_Export_features,
 33         NFSD_Fh,
 34         NFSD_FO_UnlockIP,
 35         NFSD_FO_UnlockFS,
 36         NFSD_Threads,
 37         NFSD_Pool_Threads,
 38         NFSD_Pool_Stats,
 39         NFSD_Reply_Cache_Stats,
 40         NFSD_Versions,
 41         NFSD_Ports,
 42         NFSD_MaxBlkSize,
 43         NFSD_MaxConnections,
 44         NFSD_SupportedEnctypes,
 45         /*
 46          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
 47          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
 48          */
 49 #ifdef CONFIG_NFSD_V4
 50         NFSD_Leasetime,
 51         NFSD_Gracetime,
 52         NFSD_RecoveryDir,
 53         NFSD_V4EndGrace,
 54 #endif
 55 };
 56 
 57 /*
 58  * write() for these nodes.
 59  */
 60 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
 61 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
 62 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
 63 static ssize_t write_threads(struct file *file, char *buf, size_t size);
 64 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
 65 static ssize_t write_versions(struct file *file, char *buf, size_t size);
 66 static ssize_t write_ports(struct file *file, char *buf, size_t size);
 67 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
 68 static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
 69 #ifdef CONFIG_NFSD_V4
 70 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
 71 static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
 72 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
 73 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
 74 #endif
 75 
 76 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 77         [NFSD_Fh] = write_filehandle,
 78         [NFSD_FO_UnlockIP] = write_unlock_ip,
 79         [NFSD_FO_UnlockFS] = write_unlock_fs,
 80         [NFSD_Threads] = write_threads,
 81         [NFSD_Pool_Threads] = write_pool_threads,
 82         [NFSD_Versions] = write_versions,
 83         [NFSD_Ports] = write_ports,
 84         [NFSD_MaxBlkSize] = write_maxblksize,
 85         [NFSD_MaxConnections] = write_maxconn,
 86 #ifdef CONFIG_NFSD_V4
 87         [NFSD_Leasetime] = write_leasetime,
 88         [NFSD_Gracetime] = write_gracetime,
 89         [NFSD_RecoveryDir] = write_recoverydir,
 90         [NFSD_V4EndGrace] = write_v4_end_grace,
 91 #endif
 92 };
 93 
 94 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 95 {
 96         ino_t ino =  file_inode(file)->i_ino;
 97         char *data;
 98         ssize_t rv;
 99 
100         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
101                 return -EINVAL;
102 
103         data = simple_transaction_get(file, buf, size);
104         if (IS_ERR(data))
105                 return PTR_ERR(data);
106 
107         rv =  write_op[ino](file, data, size);
108         if (rv >= 0) {
109                 simple_transaction_set(file, rv);
110                 rv = size;
111         }
112         return rv;
113 }
114 
115 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
116 {
117         if (! file->private_data) {
118                 /* An attempt to read a transaction file without writing
119                  * causes a 0-byte write so that the file can return
120                  * state information
121                  */
122                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
123                 if (rv < 0)
124                         return rv;
125         }
126         return simple_transaction_read(file, buf, size, pos);
127 }
128 
129 static const struct file_operations transaction_ops = {
130         .write          = nfsctl_transaction_write,
131         .read           = nfsctl_transaction_read,
132         .release        = simple_transaction_release,
133         .llseek         = default_llseek,
134 };
135 
136 static int exports_net_open(struct net *net, struct file *file)
137 {
138         int err;
139         struct seq_file *seq;
140         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
141 
142         err = seq_open(file, &nfs_exports_op);
143         if (err)
144                 return err;
145 
146         seq = file->private_data;
147         seq->private = nn->svc_export_cache;
148         return 0;
149 }
150 
151 static int exports_proc_open(struct inode *inode, struct file *file)
152 {
153         return exports_net_open(current->nsproxy->net_ns, file);
154 }
155 
156 static const struct file_operations exports_proc_operations = {
157         .open           = exports_proc_open,
158         .read           = seq_read,
159         .llseek         = seq_lseek,
160         .release        = seq_release,
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 };
174 
175 static int export_features_show(struct seq_file *m, void *v)
176 {
177         seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
178         return 0;
179 }
180 
181 static int export_features_open(struct inode *inode, struct file *file)
182 {
183         return single_open(file, export_features_show, NULL);
184 }
185 
186 static const struct file_operations export_features_operations = {
187         .open           = export_features_open,
188         .read           = seq_read,
189         .llseek         = seq_lseek,
190         .release        = single_release,
191 };
192 
193 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
194 static int supported_enctypes_show(struct seq_file *m, void *v)
195 {
196         seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
197         return 0;
198 }
199 
200 static int supported_enctypes_open(struct inode *inode, struct file *file)
201 {
202         return single_open(file, supported_enctypes_show, NULL);
203 }
204 
205 static const struct file_operations supported_enctypes_ops = {
206         .open           = supported_enctypes_open,
207         .read           = seq_read,
208         .llseek         = seq_lseek,
209         .release        = single_release,
210 };
211 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
212 
213 static const struct file_operations pool_stats_operations = {
214         .open           = nfsd_pool_stats_open,
215         .read           = seq_read,
216         .llseek         = seq_lseek,
217         .release        = nfsd_pool_stats_release,
218 };
219 
220 static struct file_operations reply_cache_stats_operations = {
221         .open           = nfsd_reply_cache_stats_open,
222         .read           = seq_read,
223         .llseek         = seq_lseek,
224         .release        = single_release,
225 };
226 
227 /*----------------------------------------------------------------------------*/
228 /*
229  * payload - write methods
230  */
231 
232 static inline struct net *netns(struct file *file)
233 {
234         return file_inode(file)->i_sb->s_fs_info;
235 }
236 
237 /**
238  * write_unlock_ip - Release all locks used by a client
239  *
240  * Experimental.
241  *
242  * Input:
243  *                      buf:    '\n'-terminated C string containing a
244  *                              presentation format IP address
245  *                      size:   length of C string in @buf
246  * Output:
247  *      On success:     returns zero if all specified locks were released;
248  *                      returns one if one or more locks were not released
249  *      On error:       return code is negative errno value
250  */
251 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
252 {
253         struct sockaddr_storage address;
254         struct sockaddr *sap = (struct sockaddr *)&address;
255         size_t salen = sizeof(address);
256         char *fo_path;
257         struct net *net = netns(file);
258 
259         /* sanity check */
260         if (size == 0)
261                 return -EINVAL;
262 
263         if (buf[size-1] != '\n')
264                 return -EINVAL;
265 
266         fo_path = buf;
267         if (qword_get(&buf, fo_path, size) < 0)
268                 return -EINVAL;
269 
270         if (rpc_pton(net, fo_path, size, sap, salen) == 0)
271                 return -EINVAL;
272 
273         return nlmsvc_unlock_all_by_ip(sap);
274 }
275 
276 /**
277  * write_unlock_fs - Release all locks on a local file system
278  *
279  * Experimental.
280  *
281  * Input:
282  *                      buf:    '\n'-terminated C string containing the
283  *                              absolute pathname of a local file system
284  *                      size:   length of C string in @buf
285  * Output:
286  *      On success:     returns zero if all specified locks were released;
287  *                      returns one if one or more locks were not released
288  *      On error:       return code is negative errno value
289  */
290 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
291 {
292         struct path path;
293         char *fo_path;
294         int error;
295 
296         /* sanity check */
297         if (size == 0)
298                 return -EINVAL;
299 
300         if (buf[size-1] != '\n')
301                 return -EINVAL;
302 
303         fo_path = buf;
304         if (qword_get(&buf, fo_path, size) < 0)
305                 return -EINVAL;
306 
307         error = kern_path(fo_path, 0, &path);
308         if (error)
309                 return error;
310 
311         /*
312          * XXX: Needs better sanity checking.  Otherwise we could end up
313          * releasing locks on the wrong file system.
314          *
315          * For example:
316          * 1.  Does the path refer to a directory?
317          * 2.  Is that directory a mount point, or
318          * 3.  Is that directory the root of an exported file system?
319          */
320         error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
321 
322         path_put(&path);
323         return error;
324 }
325 
326 /**
327  * write_filehandle - Get a variable-length NFS file handle by path
328  *
329  * On input, the buffer contains a '\n'-terminated C string comprised of
330  * three alphanumeric words separated by whitespace.  The string may
331  * contain escape sequences.
332  *
333  * Input:
334  *                      buf:
335  *                              domain:         client domain name
336  *                              path:           export pathname
337  *                              maxsize:        numeric maximum size of
338  *                                              @buf
339  *                      size:   length of C string in @buf
340  * Output:
341  *      On success:     passed-in buffer filled with '\n'-terminated C
342  *                      string containing a ASCII hex text version
343  *                      of the NFS file handle;
344  *                      return code is the size in bytes of the string
345  *      On error:       return code is negative errno value
346  */
347 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
348 {
349         char *dname, *path;
350         int uninitialized_var(maxsize);
351         char *mesg = buf;
352         int len;
353         struct auth_domain *dom;
354         struct knfsd_fh fh;
355 
356         if (size == 0)
357                 return -EINVAL;
358 
359         if (buf[size-1] != '\n')
360                 return -EINVAL;
361         buf[size-1] = 0;
362 
363         dname = mesg;
364         len = qword_get(&mesg, dname, size);
365         if (len <= 0)
366                 return -EINVAL;
367         
368         path = dname+len+1;
369         len = qword_get(&mesg, path, size);
370         if (len <= 0)
371                 return -EINVAL;
372 
373         len = get_int(&mesg, &maxsize);
374         if (len)
375                 return len;
376 
377         if (maxsize < NFS_FHSIZE)
378                 return -EINVAL;
379         maxsize = min(maxsize, NFS3_FHSIZE);
380 
381         if (qword_get(&mesg, mesg, size)>0)
382                 return -EINVAL;
383 
384         /* we have all the words, they are in buf.. */
385         dom = unix_domain_find(dname);
386         if (!dom)
387                 return -ENOMEM;
388 
389         len = exp_rootfh(netns(file), dom, path, &fh,  maxsize);
390         auth_domain_put(dom);
391         if (len)
392                 return len;
393         
394         mesg = buf;
395         len = SIMPLE_TRANSACTION_LIMIT;
396         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
397         mesg[-1] = '\n';
398         return mesg - buf;      
399 }
400 
401 /**
402  * write_threads - Start NFSD, or report the current number of running threads
403  *
404  * Input:
405  *                      buf:            ignored
406  *                      size:           zero
407  * Output:
408  *      On success:     passed-in buffer filled with '\n'-terminated C
409  *                      string numeric value representing the number of
410  *                      running NFSD threads;
411  *                      return code is the size in bytes of the string
412  *      On error:       return code is zero
413  *
414  * OR
415  *
416  * Input:
417  *                      buf:            C string containing an unsigned
418  *                                      integer value representing the
419  *                                      number of NFSD threads to start
420  *                      size:           non-zero length of C string in @buf
421  * Output:
422  *      On success:     NFS service is started;
423  *                      passed-in buffer filled with '\n'-terminated C
424  *                      string numeric value representing the number of
425  *                      running NFSD threads;
426  *                      return code is the size in bytes of the string
427  *      On error:       return code is zero or a negative errno value
428  */
429 static ssize_t write_threads(struct file *file, char *buf, size_t size)
430 {
431         char *mesg = buf;
432         int rv;
433         struct net *net = netns(file);
434 
435         if (size > 0) {
436                 int newthreads;
437                 rv = get_int(&mesg, &newthreads);
438                 if (rv)
439                         return rv;
440                 if (newthreads < 0)
441                         return -EINVAL;
442                 rv = nfsd_svc(newthreads, net);
443                 if (rv < 0)
444                         return rv;
445         } else
446                 rv = nfsd_nrthreads(net);
447 
448         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
449 }
450 
451 /**
452  * write_pool_threads - Set or report the current number of threads per pool
453  *
454  * Input:
455  *                      buf:            ignored
456  *                      size:           zero
457  *
458  * OR
459  *
460  * Input:
461  *                      buf:            C string containing whitespace-
462  *                                      separated unsigned integer values
463  *                                      representing the number of NFSD
464  *                                      threads to start in each pool
465  *                      size:           non-zero length of C string in @buf
466  * Output:
467  *      On success:     passed-in buffer filled with '\n'-terminated C
468  *                      string containing integer values representing the
469  *                      number of NFSD threads in each pool;
470  *                      return code is the size in bytes of the string
471  *      On error:       return code is zero or a negative errno value
472  */
473 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
474 {
475         /* if size > 0, look for an array of number of threads per node
476          * and apply them  then write out number of threads per node as reply
477          */
478         char *mesg = buf;
479         int i;
480         int rv;
481         int len;
482         int npools;
483         int *nthreads;
484         struct net *net = netns(file);
485 
486         mutex_lock(&nfsd_mutex);
487         npools = nfsd_nrpools(net);
488         if (npools == 0) {
489                 /*
490                  * NFS is shut down.  The admin can start it by
491                  * writing to the threads file but NOT the pool_threads
492                  * file, sorry.  Report zero threads.
493                  */
494                 mutex_unlock(&nfsd_mutex);
495                 strcpy(buf, "\n");
496                 return strlen(buf);
497         }
498 
499         nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
500         rv = -ENOMEM;
501         if (nthreads == NULL)
502                 goto out_free;
503 
504         if (size > 0) {
505                 for (i = 0; i < npools; i++) {
506                         rv = get_int(&mesg, &nthreads[i]);
507                         if (rv == -ENOENT)
508                                 break;          /* fewer numbers than pools */
509                         if (rv)
510                                 goto out_free;  /* syntax error */
511                         rv = -EINVAL;
512                         if (nthreads[i] < 0)
513                                 goto out_free;
514                 }
515                 rv = nfsd_set_nrthreads(i, nthreads, net);
516                 if (rv)
517                         goto out_free;
518         }
519 
520         rv = nfsd_get_nrthreads(npools, nthreads, net);
521         if (rv)
522                 goto out_free;
523 
524         mesg = buf;
525         size = SIMPLE_TRANSACTION_LIMIT;
526         for (i = 0; i < npools && size > 0; i++) {
527                 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
528                 len = strlen(mesg);
529                 size -= len;
530                 mesg += len;
531         }
532         rv = mesg - buf;
533 out_free:
534         kfree(nthreads);
535         mutex_unlock(&nfsd_mutex);
536         return rv;
537 }
538 
539 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
540 {
541         char *mesg = buf;
542         char *vers, *minorp, sign;
543         int len, num, remaining;
544         unsigned minor;
545         ssize_t tlen = 0;
546         char *sep;
547         struct nfsd_net *nn = net_generic(netns(file), 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 
834         mutex_lock(&nfsd_mutex);
835         rv = __write_ports(file, buf, size, netns(file));
836         mutex_unlock(&nfsd_mutex);
837         return rv;
838 }
839 
840 
841 int nfsd_max_blksize;
842 
843 /**
844  * write_maxblksize - Set or report the current NFS blksize
845  *
846  * Input:
847  *                      buf:            ignored
848  *                      size:           zero
849  *
850  * OR
851  *
852  * Input:
853  *                      buf:            C string containing an unsigned
854  *                                      integer value representing the new
855  *                                      NFS blksize
856  *                      size:           non-zero length of C string in @buf
857  * Output:
858  *      On success:     passed-in buffer filled with '\n'-terminated C string
859  *                      containing numeric value of the current NFS blksize
860  *                      setting;
861  *                      return code is the size in bytes of the string
862  *      On error:       return code is zero or a negative errno value
863  */
864 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
865 {
866         char *mesg = buf;
867         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
868 
869         if (size > 0) {
870                 int bsize;
871                 int rv = get_int(&mesg, &bsize);
872                 if (rv)
873                         return rv;
874                 /* force bsize into allowed range and
875                  * required alignment.
876                  */
877                 bsize = max_t(int, bsize, 1024);
878                 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
879                 bsize &= ~(1024-1);
880                 mutex_lock(&nfsd_mutex);
881                 if (nn->nfsd_serv) {
882                         mutex_unlock(&nfsd_mutex);
883                         return -EBUSY;
884                 }
885                 nfsd_max_blksize = bsize;
886                 mutex_unlock(&nfsd_mutex);
887         }
888 
889         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
890                                                         nfsd_max_blksize);
891 }
892 
893 /**
894  * write_maxconn - Set or report the current max number of connections
895  *
896  * Input:
897  *                      buf:            ignored
898  *                      size:           zero
899  * OR
900  *
901  * Input:
902  *                      buf:            C string containing an unsigned
903  *                                      integer value representing the new
904  *                                      number of max connections
905  *                      size:           non-zero length of C string in @buf
906  * Output:
907  *      On success:     passed-in buffer filled with '\n'-terminated C string
908  *                      containing numeric value of max_connections setting
909  *                      for this net namespace;
910  *                      return code is the size in bytes of the string
911  *      On error:       return code is zero or a negative errno value
912  */
913 static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
914 {
915         char *mesg = buf;
916         struct nfsd_net *nn = net_generic(netns(file), 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 nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
998         return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
999 }
1000 
1001 /**
1002  * write_gracetime - Set or report current NFSv4 grace period time
1003  *
1004  * As above, but sets the time of the NFSv4 grace period.
1005  *
1006  * Note this should never be set to less than the *previous*
1007  * lease-period time, but we don't try to enforce this.  (In the common
1008  * case (a new boot), we don't know what the previous lease time was
1009  * anyway.)
1010  */
1011 static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1012 {
1013         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1014         return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1015 }
1016 
1017 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1018                                    struct nfsd_net *nn)
1019 {
1020         char *mesg = buf;
1021         char *recdir;
1022         int len, status;
1023 
1024         if (size > 0) {
1025                 if (nn->nfsd_serv)
1026                         return -EBUSY;
1027                 if (size > PATH_MAX || buf[size-1] != '\n')
1028                         return -EINVAL;
1029                 buf[size-1] = 0;
1030 
1031                 recdir = mesg;
1032                 len = qword_get(&mesg, recdir, size);
1033                 if (len <= 0)
1034                         return -EINVAL;
1035 
1036                 status = nfs4_reset_recoverydir(recdir);
1037                 if (status)
1038                         return status;
1039         }
1040 
1041         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1042                                                         nfs4_recoverydir());
1043 }
1044 
1045 /**
1046  * write_recoverydir - Set or report the pathname of the recovery directory
1047  *
1048  * Input:
1049  *                      buf:            ignored
1050  *                      size:           zero
1051  *
1052  * OR
1053  *
1054  * Input:
1055  *                      buf:            C string containing the pathname
1056  *                                      of the directory on a local file
1057  *                                      system containing permanent NFSv4
1058  *                                      recovery data
1059  *                      size:           non-zero length of C string in @buf
1060  * Output:
1061  *      On success:     passed-in buffer filled with '\n'-terminated C string
1062  *                      containing the current recovery pathname setting;
1063  *                      return code is the size in bytes of the string
1064  *      On error:       return code is zero or a negative errno value
1065  */
1066 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1067 {
1068         ssize_t rv;
1069         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1070 
1071         mutex_lock(&nfsd_mutex);
1072         rv = __write_recoverydir(file, buf, size, nn);
1073         mutex_unlock(&nfsd_mutex);
1074         return rv;
1075 }
1076 
1077 /**
1078  * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1079  *
1080  * Input:
1081  *                      buf:            ignored
1082  *                      size:           zero
1083  * OR
1084  *
1085  * Input:
1086  *                      buf:            any value
1087  *                      size:           non-zero length of C string in @buf
1088  * Output:
1089  *                      passed-in buffer filled with "Y" or "N" with a newline
1090  *                      and NULL-terminated C string. This indicates whether
1091  *                      the grace period has ended in the current net
1092  *                      namespace. Return code is the size in bytes of the
1093  *                      string. Writing a string that starts with 'Y', 'y', or
1094  *                      '1' to the file will end the grace period for nfsd's v4
1095  *                      lock manager.
1096  */
1097 static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1098 {
1099         struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1100 
1101         if (size > 0) {
1102                 switch(buf[0]) {
1103                 case 'Y':
1104                 case 'y':
1105                 case '1':
1106                         nfsd4_end_grace(nn);
1107                         break;
1108                 default:
1109                         return -EINVAL;
1110                 }
1111         }
1112 
1113         return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1114                          nn->grace_ended ? 'Y' : 'N');
1115 }
1116 
1117 #endif
1118 
1119 /*----------------------------------------------------------------------------*/
1120 /*
1121  *      populating the filesystem.
1122  */
1123 
1124 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1125 {
1126         static struct tree_descr nfsd_files[] = {
1127                 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1128                 [NFSD_Export_features] = {"export_features",
1129                                         &export_features_operations, S_IRUGO},
1130                 [NFSD_FO_UnlockIP] = {"unlock_ip",
1131                                         &transaction_ops, S_IWUSR|S_IRUSR},
1132                 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1133                                         &transaction_ops, S_IWUSR|S_IRUSR},
1134                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1135                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1136                 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1137                 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1138                 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1139                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1140                 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1141                 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1142                 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1143 #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1144                 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1145 #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1146 #ifdef CONFIG_NFSD_V4
1147                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1148                 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1149                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1150                 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1151 #endif
1152                 /* last one */ {""}
1153         };
1154         get_net(sb->s_fs_info);
1155         return simple_fill_super(sb, 0x6e667364, nfsd_files);
1156 }
1157 
1158 static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1159         int flags, const char *dev_name, void *data)
1160 {
1161         struct net *net = current->nsproxy->net_ns;
1162         return mount_ns(fs_type, flags, data, net, net->user_ns, nfsd_fill_super);
1163 }
1164 
1165 static void nfsd_umount(struct super_block *sb)
1166 {
1167         struct net *net = sb->s_fs_info;
1168 
1169         kill_litter_super(sb);
1170         put_net(net);
1171 }
1172 
1173 static struct file_system_type nfsd_fs_type = {
1174         .owner          = THIS_MODULE,
1175         .name           = "nfsd",
1176         .mount          = nfsd_mount,
1177         .kill_sb        = nfsd_umount,
1178 };
1179 MODULE_ALIAS_FS("nfsd");
1180 
1181 #ifdef CONFIG_PROC_FS
1182 static int create_proc_exports_entry(void)
1183 {
1184         struct proc_dir_entry *entry;
1185 
1186         entry = proc_mkdir("fs/nfs", NULL);
1187         if (!entry)
1188                 return -ENOMEM;
1189         entry = proc_create("exports", 0, entry,
1190                                  &exports_proc_operations);
1191         if (!entry) {
1192                 remove_proc_entry("fs/nfs", NULL);
1193                 return -ENOMEM;
1194         }
1195         return 0;
1196 }
1197 #else /* CONFIG_PROC_FS */
1198 static int create_proc_exports_entry(void)
1199 {
1200         return 0;
1201 }
1202 #endif
1203 
1204 int nfsd_net_id;
1205 
1206 static __net_init int nfsd_init_net(struct net *net)
1207 {
1208         int retval;
1209         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1210 
1211         retval = nfsd_export_init(net);
1212         if (retval)
1213                 goto out_export_error;
1214         retval = nfsd_idmap_init(net);
1215         if (retval)
1216                 goto out_idmap_error;
1217         nn->nfsd4_lease = 90;   /* default lease time */
1218         nn->nfsd4_grace = 90;
1219         return 0;
1220 
1221 out_idmap_error:
1222         nfsd_export_shutdown(net);
1223 out_export_error:
1224         return retval;
1225 }
1226 
1227 static __net_exit void nfsd_exit_net(struct net *net)
1228 {
1229         nfsd_idmap_shutdown(net);
1230         nfsd_export_shutdown(net);
1231 }
1232 
1233 static struct pernet_operations nfsd_net_ops = {
1234         .init = nfsd_init_net,
1235         .exit = nfsd_exit_net,
1236         .id   = &nfsd_net_id,
1237         .size = sizeof(struct nfsd_net),
1238 };
1239 
1240 static int __init init_nfsd(void)
1241 {
1242         int retval;
1243         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1244 
1245         retval = register_pernet_subsys(&nfsd_net_ops);
1246         if (retval < 0)
1247                 return retval;
1248         retval = register_cld_notifier();
1249         if (retval)
1250                 goto out_unregister_pernet;
1251         retval = nfsd4_init_slabs();
1252         if (retval)
1253                 goto out_unregister_notifier;
1254         retval = nfsd4_init_pnfs();
1255         if (retval)
1256                 goto out_free_slabs;
1257         retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1258         if (retval)
1259                 goto out_exit_pnfs;
1260         nfsd_stat_init();       /* Statistics */
1261         retval = nfsd_reply_cache_init();
1262         if (retval)
1263                 goto out_free_stat;
1264         nfsd_lockd_init();      /* lockd->nfsd callbacks */
1265         retval = create_proc_exports_entry();
1266         if (retval)
1267                 goto out_free_lockd;
1268         retval = register_filesystem(&nfsd_fs_type);
1269         if (retval)
1270                 goto out_free_all;
1271         return 0;
1272 out_free_all:
1273         remove_proc_entry("fs/nfs/exports", NULL);
1274         remove_proc_entry("fs/nfs", NULL);
1275 out_free_lockd:
1276         nfsd_lockd_shutdown();
1277         nfsd_reply_cache_shutdown();
1278 out_free_stat:
1279         nfsd_stat_shutdown();
1280         nfsd_fault_inject_cleanup();
1281 out_exit_pnfs:
1282         nfsd4_exit_pnfs();
1283 out_free_slabs:
1284         nfsd4_free_slabs();
1285 out_unregister_notifier:
1286         unregister_cld_notifier();
1287 out_unregister_pernet:
1288         unregister_pernet_subsys(&nfsd_net_ops);
1289         return retval;
1290 }
1291 
1292 static void __exit exit_nfsd(void)
1293 {
1294         nfsd_reply_cache_shutdown();
1295         remove_proc_entry("fs/nfs/exports", NULL);
1296         remove_proc_entry("fs/nfs", NULL);
1297         nfsd_stat_shutdown();
1298         nfsd_lockd_shutdown();
1299         nfsd4_free_slabs();
1300         nfsd4_exit_pnfs();
1301         nfsd_fault_inject_cleanup();
1302         unregister_filesystem(&nfsd_fs_type);
1303         unregister_cld_notifier();
1304         unregister_pernet_subsys(&nfsd_net_ops);
1305 }
1306 
1307 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1308 MODULE_LICENSE("GPL");
1309 module_init(init_nfsd)
1310 module_exit(exit_nfsd)
1311 

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