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Linux/fs/ocfs2/stackglue.c

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  1 /* -*- mode: c; c-basic-offset: 8; -*-
  2  * vim: noexpandtab sw=8 ts=8 sts=0:
  3  *
  4  * stackglue.c
  5  *
  6  * Code which implements an OCFS2 specific interface to underlying
  7  * cluster stacks.
  8  *
  9  * Copyright (C) 2007, 2009 Oracle.  All rights reserved.
 10  *
 11  * This program is free software; you can redistribute it and/or
 12  * modify it under the terms of the GNU General Public
 13  * License as published by the Free Software Foundation, version 2.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 18  * General Public License for more details.
 19  */
 20 
 21 #include <linux/list.h>
 22 #include <linux/spinlock.h>
 23 #include <linux/module.h>
 24 #include <linux/slab.h>
 25 #include <linux/kmod.h>
 26 #include <linux/fs.h>
 27 #include <linux/kobject.h>
 28 #include <linux/sysfs.h>
 29 #include <linux/sysctl.h>
 30 
 31 #include "ocfs2_fs.h"
 32 
 33 #include "stackglue.h"
 34 
 35 #define OCFS2_STACK_PLUGIN_O2CB         "o2cb"
 36 #define OCFS2_STACK_PLUGIN_USER         "user"
 37 #define OCFS2_MAX_HB_CTL_PATH           256
 38 
 39 static struct ocfs2_protocol_version locking_max_version;
 40 static DEFINE_SPINLOCK(ocfs2_stack_lock);
 41 static LIST_HEAD(ocfs2_stack_list);
 42 static char cluster_stack_name[OCFS2_STACK_LABEL_LEN + 1];
 43 static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl";
 44 
 45 /*
 46  * The stack currently in use.  If not null, active_stack->sp_count > 0,
 47  * the module is pinned, and the locking protocol cannot be changed.
 48  */
 49 static struct ocfs2_stack_plugin *active_stack;
 50 
 51 static struct ocfs2_stack_plugin *ocfs2_stack_lookup(const char *name)
 52 {
 53         struct ocfs2_stack_plugin *p;
 54 
 55         assert_spin_locked(&ocfs2_stack_lock);
 56 
 57         list_for_each_entry(p, &ocfs2_stack_list, sp_list) {
 58                 if (!strcmp(p->sp_name, name))
 59                         return p;
 60         }
 61 
 62         return NULL;
 63 }
 64 
 65 static int ocfs2_stack_driver_request(const char *stack_name,
 66                                       const char *plugin_name)
 67 {
 68         int rc;
 69         struct ocfs2_stack_plugin *p;
 70 
 71         spin_lock(&ocfs2_stack_lock);
 72 
 73         /*
 74          * If the stack passed by the filesystem isn't the selected one,
 75          * we can't continue.
 76          */
 77         if (strcmp(stack_name, cluster_stack_name)) {
 78                 rc = -EBUSY;
 79                 goto out;
 80         }
 81 
 82         if (active_stack) {
 83                 /*
 84                  * If the active stack isn't the one we want, it cannot
 85                  * be selected right now.
 86                  */
 87                 if (!strcmp(active_stack->sp_name, plugin_name))
 88                         rc = 0;
 89                 else
 90                         rc = -EBUSY;
 91                 goto out;
 92         }
 93 
 94         p = ocfs2_stack_lookup(plugin_name);
 95         if (!p || !try_module_get(p->sp_owner)) {
 96                 rc = -ENOENT;
 97                 goto out;
 98         }
 99 
100         active_stack = p;
101         rc = 0;
102 
103 out:
104         /* If we found it, pin it */
105         if (!rc)
106                 active_stack->sp_count++;
107 
108         spin_unlock(&ocfs2_stack_lock);
109         return rc;
110 }
111 
112 /*
113  * This function looks up the appropriate stack and makes it active.  If
114  * there is no stack, it tries to load it.  It will fail if the stack still
115  * cannot be found.  It will also fail if a different stack is in use.
116  */
117 static int ocfs2_stack_driver_get(const char *stack_name)
118 {
119         int rc;
120         char *plugin_name = OCFS2_STACK_PLUGIN_O2CB;
121 
122         /*
123          * Classic stack does not pass in a stack name.  This is
124          * compatible with older tools as well.
125          */
126         if (!stack_name || !*stack_name)
127                 stack_name = OCFS2_STACK_PLUGIN_O2CB;
128 
129         if (strlen(stack_name) != OCFS2_STACK_LABEL_LEN) {
130                 printk(KERN_ERR
131                        "ocfs2 passed an invalid cluster stack label: \"%s\"\n",
132                        stack_name);
133                 return -EINVAL;
134         }
135 
136         /* Anything that isn't the classic stack is a user stack */
137         if (strcmp(stack_name, OCFS2_STACK_PLUGIN_O2CB))
138                 plugin_name = OCFS2_STACK_PLUGIN_USER;
139 
140         rc = ocfs2_stack_driver_request(stack_name, plugin_name);
141         if (rc == -ENOENT) {
142                 request_module("ocfs2_stack_%s", plugin_name);
143                 rc = ocfs2_stack_driver_request(stack_name, plugin_name);
144         }
145 
146         if (rc == -ENOENT) {
147                 printk(KERN_ERR
148                        "ocfs2: Cluster stack driver \"%s\" cannot be found\n",
149                        plugin_name);
150         } else if (rc == -EBUSY) {
151                 printk(KERN_ERR
152                        "ocfs2: A different cluster stack is in use\n");
153         }
154 
155         return rc;
156 }
157 
158 static void ocfs2_stack_driver_put(void)
159 {
160         spin_lock(&ocfs2_stack_lock);
161         BUG_ON(active_stack == NULL);
162         BUG_ON(active_stack->sp_count == 0);
163 
164         active_stack->sp_count--;
165         if (!active_stack->sp_count) {
166                 module_put(active_stack->sp_owner);
167                 active_stack = NULL;
168         }
169         spin_unlock(&ocfs2_stack_lock);
170 }
171 
172 int ocfs2_stack_glue_register(struct ocfs2_stack_plugin *plugin)
173 {
174         int rc;
175 
176         spin_lock(&ocfs2_stack_lock);
177         if (!ocfs2_stack_lookup(plugin->sp_name)) {
178                 plugin->sp_count = 0;
179                 plugin->sp_max_proto = locking_max_version;
180                 list_add(&plugin->sp_list, &ocfs2_stack_list);
181                 printk(KERN_INFO "ocfs2: Registered cluster interface %s\n",
182                        plugin->sp_name);
183                 rc = 0;
184         } else {
185                 printk(KERN_ERR "ocfs2: Stack \"%s\" already registered\n",
186                        plugin->sp_name);
187                 rc = -EEXIST;
188         }
189         spin_unlock(&ocfs2_stack_lock);
190 
191         return rc;
192 }
193 EXPORT_SYMBOL_GPL(ocfs2_stack_glue_register);
194 
195 void ocfs2_stack_glue_unregister(struct ocfs2_stack_plugin *plugin)
196 {
197         struct ocfs2_stack_plugin *p;
198 
199         spin_lock(&ocfs2_stack_lock);
200         p = ocfs2_stack_lookup(plugin->sp_name);
201         if (p) {
202                 BUG_ON(p != plugin);
203                 BUG_ON(plugin == active_stack);
204                 BUG_ON(plugin->sp_count != 0);
205                 list_del_init(&plugin->sp_list);
206                 printk(KERN_INFO "ocfs2: Unregistered cluster interface %s\n",
207                        plugin->sp_name);
208         } else {
209                 printk(KERN_ERR "Stack \"%s\" is not registered\n",
210                        plugin->sp_name);
211         }
212         spin_unlock(&ocfs2_stack_lock);
213 }
214 EXPORT_SYMBOL_GPL(ocfs2_stack_glue_unregister);
215 
216 void ocfs2_stack_glue_set_max_proto_version(struct ocfs2_protocol_version *max_proto)
217 {
218         struct ocfs2_stack_plugin *p;
219 
220         spin_lock(&ocfs2_stack_lock);
221         if (memcmp(max_proto, &locking_max_version,
222                    sizeof(struct ocfs2_protocol_version))) {
223                 BUG_ON(locking_max_version.pv_major != 0);
224 
225                 locking_max_version = *max_proto;
226                 list_for_each_entry(p, &ocfs2_stack_list, sp_list) {
227                         p->sp_max_proto = locking_max_version;
228                 }
229         }
230         spin_unlock(&ocfs2_stack_lock);
231 }
232 EXPORT_SYMBOL_GPL(ocfs2_stack_glue_set_max_proto_version);
233 
234 
235 /*
236  * The ocfs2_dlm_lock() and ocfs2_dlm_unlock() functions take no argument
237  * for the ast and bast functions.  They will pass the lksb to the ast
238  * and bast.  The caller can wrap the lksb with their own structure to
239  * get more information.
240  */
241 int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn,
242                    int mode,
243                    struct ocfs2_dlm_lksb *lksb,
244                    u32 flags,
245                    void *name,
246                    unsigned int namelen)
247 {
248         if (!lksb->lksb_conn)
249                 lksb->lksb_conn = conn;
250         else
251                 BUG_ON(lksb->lksb_conn != conn);
252         return active_stack->sp_ops->dlm_lock(conn, mode, lksb, flags,
253                                               name, namelen);
254 }
255 EXPORT_SYMBOL_GPL(ocfs2_dlm_lock);
256 
257 int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn,
258                      struct ocfs2_dlm_lksb *lksb,
259                      u32 flags)
260 {
261         BUG_ON(lksb->lksb_conn == NULL);
262 
263         return active_stack->sp_ops->dlm_unlock(conn, lksb, flags);
264 }
265 EXPORT_SYMBOL_GPL(ocfs2_dlm_unlock);
266 
267 int ocfs2_dlm_lock_status(struct ocfs2_dlm_lksb *lksb)
268 {
269         return active_stack->sp_ops->lock_status(lksb);
270 }
271 EXPORT_SYMBOL_GPL(ocfs2_dlm_lock_status);
272 
273 int ocfs2_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb)
274 {
275         return active_stack->sp_ops->lvb_valid(lksb);
276 }
277 EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb_valid);
278 
279 void *ocfs2_dlm_lvb(struct ocfs2_dlm_lksb *lksb)
280 {
281         return active_stack->sp_ops->lock_lvb(lksb);
282 }
283 EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb);
284 
285 void ocfs2_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb)
286 {
287         active_stack->sp_ops->dump_lksb(lksb);
288 }
289 EXPORT_SYMBOL_GPL(ocfs2_dlm_dump_lksb);
290 
291 int ocfs2_stack_supports_plocks(void)
292 {
293         return active_stack && active_stack->sp_ops->plock;
294 }
295 EXPORT_SYMBOL_GPL(ocfs2_stack_supports_plocks);
296 
297 /*
298  * ocfs2_plock() can only be safely called if
299  * ocfs2_stack_supports_plocks() returned true
300  */
301 int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino,
302                 struct file *file, int cmd, struct file_lock *fl)
303 {
304         WARN_ON_ONCE(active_stack->sp_ops->plock == NULL);
305         if (active_stack->sp_ops->plock)
306                 return active_stack->sp_ops->plock(conn, ino, file, cmd, fl);
307         return -EOPNOTSUPP;
308 }
309 EXPORT_SYMBOL_GPL(ocfs2_plock);
310 
311 int ocfs2_cluster_connect(const char *stack_name,
312                           const char *group,
313                           int grouplen,
314                           struct ocfs2_locking_protocol *lproto,
315                           void (*recovery_handler)(int node_num,
316                                                    void *recovery_data),
317                           void *recovery_data,
318                           struct ocfs2_cluster_connection **conn)
319 {
320         int rc = 0;
321         struct ocfs2_cluster_connection *new_conn;
322 
323         BUG_ON(group == NULL);
324         BUG_ON(conn == NULL);
325         BUG_ON(recovery_handler == NULL);
326 
327         if (grouplen > GROUP_NAME_MAX) {
328                 rc = -EINVAL;
329                 goto out;
330         }
331 
332         if (memcmp(&lproto->lp_max_version, &locking_max_version,
333                    sizeof(struct ocfs2_protocol_version))) {
334                 rc = -EINVAL;
335                 goto out;
336         }
337 
338         new_conn = kzalloc(sizeof(struct ocfs2_cluster_connection),
339                            GFP_KERNEL);
340         if (!new_conn) {
341                 rc = -ENOMEM;
342                 goto out;
343         }
344 
345         memcpy(new_conn->cc_name, group, grouplen);
346         new_conn->cc_namelen = grouplen;
347         new_conn->cc_recovery_handler = recovery_handler;
348         new_conn->cc_recovery_data = recovery_data;
349 
350         new_conn->cc_proto = lproto;
351         /* Start the new connection at our maximum compatibility level */
352         new_conn->cc_version = lproto->lp_max_version;
353 
354         /* This will pin the stack driver if successful */
355         rc = ocfs2_stack_driver_get(stack_name);
356         if (rc)
357                 goto out_free;
358 
359         rc = active_stack->sp_ops->connect(new_conn);
360         if (rc) {
361                 ocfs2_stack_driver_put();
362                 goto out_free;
363         }
364 
365         *conn = new_conn;
366 
367 out_free:
368         if (rc)
369                 kfree(new_conn);
370 
371 out:
372         return rc;
373 }
374 EXPORT_SYMBOL_GPL(ocfs2_cluster_connect);
375 
376 /* The caller will ensure all nodes have the same cluster stack */
377 int ocfs2_cluster_connect_agnostic(const char *group,
378                                    int grouplen,
379                                    struct ocfs2_locking_protocol *lproto,
380                                    void (*recovery_handler)(int node_num,
381                                                             void *recovery_data),
382                                    void *recovery_data,
383                                    struct ocfs2_cluster_connection **conn)
384 {
385         char *stack_name = NULL;
386 
387         if (cluster_stack_name[0])
388                 stack_name = cluster_stack_name;
389         return ocfs2_cluster_connect(stack_name, group, grouplen, lproto,
390                                      recovery_handler, recovery_data, conn);
391 }
392 EXPORT_SYMBOL_GPL(ocfs2_cluster_connect_agnostic);
393 
394 /* If hangup_pending is 0, the stack driver will be dropped */
395 int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn,
396                              int hangup_pending)
397 {
398         int ret;
399 
400         BUG_ON(conn == NULL);
401 
402         ret = active_stack->sp_ops->disconnect(conn);
403 
404         /* XXX Should we free it anyway? */
405         if (!ret) {
406                 kfree(conn);
407                 if (!hangup_pending)
408                         ocfs2_stack_driver_put();
409         }
410 
411         return ret;
412 }
413 EXPORT_SYMBOL_GPL(ocfs2_cluster_disconnect);
414 
415 /*
416  * Leave the group for this filesystem.  This is executed by a userspace
417  * program (stored in ocfs2_hb_ctl_path).
418  */
419 static void ocfs2_leave_group(const char *group)
420 {
421         int ret;
422         char *argv[5], *envp[3];
423 
424         argv[0] = ocfs2_hb_ctl_path;
425         argv[1] = "-K";
426         argv[2] = "-u";
427         argv[3] = (char *)group;
428         argv[4] = NULL;
429 
430         /* minimal command environment taken from cpu_run_sbin_hotplug */
431         envp[0] = "HOME=/";
432         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
433         envp[2] = NULL;
434 
435         ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
436         if (ret < 0) {
437                 printk(KERN_ERR
438                        "ocfs2: Error %d running user helper "
439                        "\"%s %s %s %s\"\n",
440                        ret, argv[0], argv[1], argv[2], argv[3]);
441         }
442 }
443 
444 /*
445  * Hangup is a required post-umount.  ocfs2-tools software expects the
446  * filesystem to call "ocfs2_hb_ctl" during unmount.  This happens
447  * regardless of whether the DLM got started, so we can't do it
448  * in ocfs2_cluster_disconnect().  The ocfs2_leave_group() function does
449  * the actual work.
450  */
451 void ocfs2_cluster_hangup(const char *group, int grouplen)
452 {
453         BUG_ON(group == NULL);
454         BUG_ON(group[grouplen] != '\0');
455 
456         ocfs2_leave_group(group);
457 
458         /* cluster_disconnect() was called with hangup_pending==1 */
459         ocfs2_stack_driver_put();
460 }
461 EXPORT_SYMBOL_GPL(ocfs2_cluster_hangup);
462 
463 int ocfs2_cluster_this_node(unsigned int *node)
464 {
465         return active_stack->sp_ops->this_node(node);
466 }
467 EXPORT_SYMBOL_GPL(ocfs2_cluster_this_node);
468 
469 
470 /*
471  * Sysfs bits
472  */
473 
474 static ssize_t ocfs2_max_locking_protocol_show(struct kobject *kobj,
475                                                struct kobj_attribute *attr,
476                                                char *buf)
477 {
478         ssize_t ret = 0;
479 
480         spin_lock(&ocfs2_stack_lock);
481         if (locking_max_version.pv_major)
482                 ret = snprintf(buf, PAGE_SIZE, "%u.%u\n",
483                                locking_max_version.pv_major,
484                                locking_max_version.pv_minor);
485         spin_unlock(&ocfs2_stack_lock);
486 
487         return ret;
488 }
489 
490 static struct kobj_attribute ocfs2_attr_max_locking_protocol =
491         __ATTR(max_locking_protocol, S_IFREG | S_IRUGO,
492                ocfs2_max_locking_protocol_show, NULL);
493 
494 static ssize_t ocfs2_loaded_cluster_plugins_show(struct kobject *kobj,
495                                                  struct kobj_attribute *attr,
496                                                  char *buf)
497 {
498         ssize_t ret = 0, total = 0, remain = PAGE_SIZE;
499         struct ocfs2_stack_plugin *p;
500 
501         spin_lock(&ocfs2_stack_lock);
502         list_for_each_entry(p, &ocfs2_stack_list, sp_list) {
503                 ret = snprintf(buf, remain, "%s\n",
504                                p->sp_name);
505                 if (ret < 0) {
506                         total = ret;
507                         break;
508                 }
509                 if (ret == remain) {
510                         /* snprintf() didn't fit */
511                         total = -E2BIG;
512                         break;
513                 }
514                 total += ret;
515                 remain -= ret;
516         }
517         spin_unlock(&ocfs2_stack_lock);
518 
519         return total;
520 }
521 
522 static struct kobj_attribute ocfs2_attr_loaded_cluster_plugins =
523         __ATTR(loaded_cluster_plugins, S_IFREG | S_IRUGO,
524                ocfs2_loaded_cluster_plugins_show, NULL);
525 
526 static ssize_t ocfs2_active_cluster_plugin_show(struct kobject *kobj,
527                                                 struct kobj_attribute *attr,
528                                                 char *buf)
529 {
530         ssize_t ret = 0;
531 
532         spin_lock(&ocfs2_stack_lock);
533         if (active_stack) {
534                 ret = snprintf(buf, PAGE_SIZE, "%s\n",
535                                active_stack->sp_name);
536                 if (ret == PAGE_SIZE)
537                         ret = -E2BIG;
538         }
539         spin_unlock(&ocfs2_stack_lock);
540 
541         return ret;
542 }
543 
544 static struct kobj_attribute ocfs2_attr_active_cluster_plugin =
545         __ATTR(active_cluster_plugin, S_IFREG | S_IRUGO,
546                ocfs2_active_cluster_plugin_show, NULL);
547 
548 static ssize_t ocfs2_cluster_stack_show(struct kobject *kobj,
549                                         struct kobj_attribute *attr,
550                                         char *buf)
551 {
552         ssize_t ret;
553         spin_lock(&ocfs2_stack_lock);
554         ret = snprintf(buf, PAGE_SIZE, "%s\n", cluster_stack_name);
555         spin_unlock(&ocfs2_stack_lock);
556 
557         return ret;
558 }
559 
560 static ssize_t ocfs2_cluster_stack_store(struct kobject *kobj,
561                                          struct kobj_attribute *attr,
562                                          const char *buf, size_t count)
563 {
564         size_t len = count;
565         ssize_t ret;
566 
567         if (len == 0)
568                 return len;
569 
570         if (buf[len - 1] == '\n')
571                 len--;
572 
573         if ((len != OCFS2_STACK_LABEL_LEN) ||
574             (strnlen(buf, len) != len))
575                 return -EINVAL;
576 
577         spin_lock(&ocfs2_stack_lock);
578         if (active_stack) {
579                 if (!strncmp(buf, cluster_stack_name, len))
580                         ret = count;
581                 else
582                         ret = -EBUSY;
583         } else {
584                 memcpy(cluster_stack_name, buf, len);
585                 ret = count;
586         }
587         spin_unlock(&ocfs2_stack_lock);
588 
589         return ret;
590 }
591 
592 
593 static struct kobj_attribute ocfs2_attr_cluster_stack =
594         __ATTR(cluster_stack, S_IFREG | S_IRUGO | S_IWUSR,
595                ocfs2_cluster_stack_show,
596                ocfs2_cluster_stack_store);
597 
598 static struct attribute *ocfs2_attrs[] = {
599         &ocfs2_attr_max_locking_protocol.attr,
600         &ocfs2_attr_loaded_cluster_plugins.attr,
601         &ocfs2_attr_active_cluster_plugin.attr,
602         &ocfs2_attr_cluster_stack.attr,
603         NULL,
604 };
605 
606 static struct attribute_group ocfs2_attr_group = {
607         .attrs = ocfs2_attrs,
608 };
609 
610 static struct kset *ocfs2_kset;
611 
612 static void ocfs2_sysfs_exit(void)
613 {
614         kset_unregister(ocfs2_kset);
615 }
616 
617 static int ocfs2_sysfs_init(void)
618 {
619         int ret;
620 
621         ocfs2_kset = kset_create_and_add("ocfs2", NULL, fs_kobj);
622         if (!ocfs2_kset)
623                 return -ENOMEM;
624 
625         ret = sysfs_create_group(&ocfs2_kset->kobj, &ocfs2_attr_group);
626         if (ret)
627                 goto error;
628 
629         return 0;
630 
631 error:
632         kset_unregister(ocfs2_kset);
633         return ret;
634 }
635 
636 /*
637  * Sysctl bits
638  *
639  * The sysctl lives at /proc/sys/fs/ocfs2/nm/hb_ctl_path.  The 'nm' doesn't
640  * make as much sense in a multiple cluster stack world, but it's safer
641  * and easier to preserve the name.
642  */
643 
644 #define FS_OCFS2_NM             1
645 
646 static ctl_table ocfs2_nm_table[] = {
647         {
648                 .procname       = "hb_ctl_path",
649                 .data           = ocfs2_hb_ctl_path,
650                 .maxlen         = OCFS2_MAX_HB_CTL_PATH,
651                 .mode           = 0644,
652                 .proc_handler   = proc_dostring,
653         },
654         { }
655 };
656 
657 static ctl_table ocfs2_mod_table[] = {
658         {
659                 .procname       = "nm",
660                 .data           = NULL,
661                 .maxlen         = 0,
662                 .mode           = 0555,
663                 .child          = ocfs2_nm_table
664         },
665         { }
666 };
667 
668 static ctl_table ocfs2_kern_table[] = {
669         {
670                 .procname       = "ocfs2",
671                 .data           = NULL,
672                 .maxlen         = 0,
673                 .mode           = 0555,
674                 .child          = ocfs2_mod_table
675         },
676         { }
677 };
678 
679 static ctl_table ocfs2_root_table[] = {
680         {
681                 .procname       = "fs",
682                 .data           = NULL,
683                 .maxlen         = 0,
684                 .mode           = 0555,
685                 .child          = ocfs2_kern_table
686         },
687         { }
688 };
689 
690 static struct ctl_table_header *ocfs2_table_header = NULL;
691 
692 
693 /*
694  * Initialization
695  */
696 
697 static int __init ocfs2_stack_glue_init(void)
698 {
699         strcpy(cluster_stack_name, OCFS2_STACK_PLUGIN_O2CB);
700 
701         ocfs2_table_header = register_sysctl_table(ocfs2_root_table);
702         if (!ocfs2_table_header) {
703                 printk(KERN_ERR
704                        "ocfs2 stack glue: unable to register sysctl\n");
705                 return -ENOMEM; /* or something. */
706         }
707 
708         return ocfs2_sysfs_init();
709 }
710 
711 static void __exit ocfs2_stack_glue_exit(void)
712 {
713         memset(&locking_max_version, 0,
714                sizeof(struct ocfs2_protocol_version));
715         locking_max_version.pv_major = 0;
716         locking_max_version.pv_minor = 0;
717         ocfs2_sysfs_exit();
718         if (ocfs2_table_header)
719                 unregister_sysctl_table(ocfs2_table_header);
720 }
721 
722 MODULE_AUTHOR("Oracle");
723 MODULE_DESCRIPTION("ocfs2 cluter stack glue layer");
724 MODULE_LICENSE("GPL");
725 module_init(ocfs2_stack_glue_init);
726 module_exit(ocfs2_stack_glue_exit);
727 

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