dd4aefa11b3db906b956a9efb06a72b038f26066
[sfrench/cifs-2.6.git] / fs / ocfs2 / cluster / nodemanager.c
1 /* -*- mode: c; c-basic-offset: 8; -*-
2  * vim: noexpandtab sw=8 ts=8 sts=0:
3  *
4  * Copyright (C) 2004, 2005 Oracle.  All rights reserved.
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public
8  * License as published by the Free Software Foundation; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public
17  * License along with this program; if not, write to the
18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19  * Boston, MA 021110-1307, USA.
20  */
21
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/sysctl.h>
25 #include <linux/configfs.h>
26
27 #include "endian.h"
28 #include "tcp.h"
29 #include "nodemanager.h"
30 #include "heartbeat.h"
31 #include "masklog.h"
32 #include "sys.h"
33 #include "ver.h"
34
35 /* for now we operate under the assertion that there can be only one
36  * cluster active at a time.  Changing this will require trickling
37  * cluster references throughout where nodes are looked up */
38 struct o2nm_cluster *o2nm_single_cluster = NULL;
39
40 #define OCFS2_MAX_HB_CTL_PATH 256
41 static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl";
42
43 static ctl_table ocfs2_nm_table[] = {
44         {
45                 .ctl_name       = 1,
46                 .procname       = "hb_ctl_path",
47                 .data           = ocfs2_hb_ctl_path,
48                 .maxlen         = OCFS2_MAX_HB_CTL_PATH,
49                 .mode           = 0644,
50                 .proc_handler   = &proc_dostring,
51                 .strategy       = &sysctl_string,
52         },
53         { .ctl_name = 0 }
54 };
55
56 static ctl_table ocfs2_mod_table[] = {
57         {
58                 .ctl_name       = KERN_OCFS2_NM,
59                 .procname       = "nm",
60                 .data           = NULL,
61                 .maxlen         = 0,
62                 .mode           = 0555,
63                 .child          = ocfs2_nm_table
64         },
65         { .ctl_name = 0}
66 };
67
68 static ctl_table ocfs2_kern_table[] = {
69         {
70                 .ctl_name       = KERN_OCFS2,
71                 .procname       = "ocfs2",
72                 .data           = NULL,
73                 .maxlen         = 0,
74                 .mode           = 0555,
75                 .child          = ocfs2_mod_table
76         },
77         { .ctl_name = 0}
78 };
79
80 static ctl_table ocfs2_root_table[] = {
81         {
82                 .ctl_name       = CTL_FS,
83                 .procname       = "fs",
84                 .data           = NULL,
85                 .maxlen         = 0,
86                 .mode           = 0555,
87                 .child          = ocfs2_kern_table
88         },
89         { .ctl_name = 0 }
90 };
91
92 static struct ctl_table_header *ocfs2_table_header = NULL;
93
94 const char *o2nm_get_hb_ctl_path(void)
95 {
96         return ocfs2_hb_ctl_path;
97 }
98 EXPORT_SYMBOL_GPL(o2nm_get_hb_ctl_path);
99
100 struct o2nm_node *o2nm_get_node_by_num(u8 node_num)
101 {
102         struct o2nm_node *node = NULL;
103
104         if (node_num >= O2NM_MAX_NODES || o2nm_single_cluster == NULL)
105                 goto out;
106
107         read_lock(&o2nm_single_cluster->cl_nodes_lock);
108         node = o2nm_single_cluster->cl_nodes[node_num];
109         if (node)
110                 config_item_get(&node->nd_item);
111         read_unlock(&o2nm_single_cluster->cl_nodes_lock);
112 out:
113         return node;
114 }
115 EXPORT_SYMBOL_GPL(o2nm_get_node_by_num);
116
117 int o2nm_configured_node_map(unsigned long *map, unsigned bytes)
118 {
119         struct o2nm_cluster *cluster = o2nm_single_cluster;
120
121         BUG_ON(bytes < (sizeof(cluster->cl_nodes_bitmap)));
122
123         if (cluster == NULL)
124                 return -EINVAL;
125
126         read_lock(&cluster->cl_nodes_lock);
127         memcpy(map, cluster->cl_nodes_bitmap, sizeof(cluster->cl_nodes_bitmap));
128         read_unlock(&cluster->cl_nodes_lock);
129
130         return 0;
131 }
132 EXPORT_SYMBOL_GPL(o2nm_configured_node_map);
133
134 static struct o2nm_node *o2nm_node_ip_tree_lookup(struct o2nm_cluster *cluster,
135                                                   __be32 ip_needle,
136                                                   struct rb_node ***ret_p,
137                                                   struct rb_node **ret_parent)
138 {
139         struct rb_node **p = &cluster->cl_node_ip_tree.rb_node;
140         struct rb_node *parent = NULL;
141         struct o2nm_node *node, *ret = NULL;
142
143         while (*p) {
144                 int cmp;
145
146                 parent = *p;
147                 node = rb_entry(parent, struct o2nm_node, nd_ip_node);
148
149                 cmp = memcmp(&ip_needle, &node->nd_ipv4_address,
150                                 sizeof(ip_needle));
151                 if (cmp < 0)
152                         p = &(*p)->rb_left;
153                 else if (cmp > 0)
154                         p = &(*p)->rb_right;
155                 else {
156                         ret = node;
157                         break;
158                 }
159         }
160
161         if (ret_p != NULL)
162                 *ret_p = p;
163         if (ret_parent != NULL)
164                 *ret_parent = parent;
165
166         return ret;
167 }
168
169 struct o2nm_node *o2nm_get_node_by_ip(__be32 addr)
170 {
171         struct o2nm_node *node = NULL;
172         struct o2nm_cluster *cluster = o2nm_single_cluster;
173
174         if (cluster == NULL)
175                 goto out;
176
177         read_lock(&cluster->cl_nodes_lock);
178         node = o2nm_node_ip_tree_lookup(cluster, addr, NULL, NULL);
179         if (node)
180                 config_item_get(&node->nd_item);
181         read_unlock(&cluster->cl_nodes_lock);
182
183 out:
184         return node;
185 }
186 EXPORT_SYMBOL_GPL(o2nm_get_node_by_ip);
187
188 void o2nm_node_put(struct o2nm_node *node)
189 {
190         config_item_put(&node->nd_item);
191 }
192 EXPORT_SYMBOL_GPL(o2nm_node_put);
193
194 void o2nm_node_get(struct o2nm_node *node)
195 {
196         config_item_get(&node->nd_item);
197 }
198 EXPORT_SYMBOL_GPL(o2nm_node_get);
199
200 u8 o2nm_this_node(void)
201 {
202         u8 node_num = O2NM_MAX_NODES;
203
204         if (o2nm_single_cluster && o2nm_single_cluster->cl_has_local)
205                 node_num = o2nm_single_cluster->cl_local_node;
206
207         return node_num;
208 }
209 EXPORT_SYMBOL_GPL(o2nm_this_node);
210
211 /* node configfs bits */
212
213 static struct o2nm_cluster *to_o2nm_cluster(struct config_item *item)
214 {
215         return item ?
216                 container_of(to_config_group(item), struct o2nm_cluster,
217                              cl_group)
218                 : NULL;
219 }
220
221 static struct o2nm_node *to_o2nm_node(struct config_item *item)
222 {
223         return item ? container_of(item, struct o2nm_node, nd_item) : NULL;
224 }
225
226 static void o2nm_node_release(struct config_item *item)
227 {
228         struct o2nm_node *node = to_o2nm_node(item);
229         kfree(node);
230 }
231
232 static ssize_t o2nm_node_num_read(struct o2nm_node *node, char *page)
233 {
234         return sprintf(page, "%d\n", node->nd_num);
235 }
236
237 static struct o2nm_cluster *to_o2nm_cluster_from_node(struct o2nm_node *node)
238 {
239         /* through the first node_set .parent
240          * mycluster/nodes/mynode == o2nm_cluster->o2nm_node_group->o2nm_node */
241         return to_o2nm_cluster(node->nd_item.ci_parent->ci_parent);
242 }
243
244 enum {
245         O2NM_NODE_ATTR_NUM = 0,
246         O2NM_NODE_ATTR_PORT,
247         O2NM_NODE_ATTR_ADDRESS,
248         O2NM_NODE_ATTR_LOCAL,
249 };
250
251 static ssize_t o2nm_node_num_write(struct o2nm_node *node, const char *page,
252                                    size_t count)
253 {
254         struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node);
255         unsigned long tmp;
256         char *p = (char *)page;
257
258         tmp = simple_strtoul(p, &p, 0);
259         if (!p || (*p && (*p != '\n')))
260                 return -EINVAL;
261
262         if (tmp >= O2NM_MAX_NODES)
263                 return -ERANGE;
264
265         /* once we're in the cl_nodes tree networking can look us up by
266          * node number and try to use our address and port attributes
267          * to connect to this node.. make sure that they've been set
268          * before writing the node attribute? */
269         if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
270             !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
271                 return -EINVAL; /* XXX */
272
273         write_lock(&cluster->cl_nodes_lock);
274         if (cluster->cl_nodes[tmp])
275                 p = NULL;
276         else  {
277                 cluster->cl_nodes[tmp] = node;
278                 node->nd_num = tmp;
279                 set_bit(tmp, cluster->cl_nodes_bitmap);
280         }
281         write_unlock(&cluster->cl_nodes_lock);
282         if (p == NULL)
283                 return -EEXIST;
284
285         return count;
286 }
287 static ssize_t o2nm_node_ipv4_port_read(struct o2nm_node *node, char *page)
288 {
289         return sprintf(page, "%u\n", ntohs(node->nd_ipv4_port));
290 }
291
292 static ssize_t o2nm_node_ipv4_port_write(struct o2nm_node *node,
293                                          const char *page, size_t count)
294 {
295         unsigned long tmp;
296         char *p = (char *)page;
297
298         tmp = simple_strtoul(p, &p, 0);
299         if (!p || (*p && (*p != '\n')))
300                 return -EINVAL;
301
302         if (tmp == 0)
303                 return -EINVAL;
304         if (tmp >= (u16)-1)
305                 return -ERANGE;
306
307         node->nd_ipv4_port = htons(tmp);
308
309         return count;
310 }
311
312 static ssize_t o2nm_node_ipv4_address_read(struct o2nm_node *node, char *page)
313 {
314         return sprintf(page, "%u.%u.%u.%u\n", NIPQUAD(node->nd_ipv4_address));
315 }
316
317 static ssize_t o2nm_node_ipv4_address_write(struct o2nm_node *node,
318                                             const char *page,
319                                             size_t count)
320 {
321         struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node);
322         int ret, i;
323         struct rb_node **p, *parent;
324         unsigned int octets[4];
325         __be32 ipv4_addr = 0;
326
327         ret = sscanf(page, "%3u.%3u.%3u.%3u", &octets[3], &octets[2],
328                      &octets[1], &octets[0]);
329         if (ret != 4)
330                 return -EINVAL;
331
332         for (i = 0; i < ARRAY_SIZE(octets); i++) {
333                 if (octets[i] > 255)
334                         return -ERANGE;
335                 be32_add_cpu(&ipv4_addr, octets[i] << (i * 8));
336         }
337
338         ret = 0;
339         write_lock(&cluster->cl_nodes_lock);
340         if (o2nm_node_ip_tree_lookup(cluster, ipv4_addr, &p, &parent))
341                 ret = -EEXIST;
342         else {
343                 rb_link_node(&node->nd_ip_node, parent, p);
344                 rb_insert_color(&node->nd_ip_node, &cluster->cl_node_ip_tree);
345         }
346         write_unlock(&cluster->cl_nodes_lock);
347         if (ret)
348                 return ret;
349
350         memcpy(&node->nd_ipv4_address, &ipv4_addr, sizeof(ipv4_addr));
351
352         return count;
353 }
354
355 static ssize_t o2nm_node_local_read(struct o2nm_node *node, char *page)
356 {
357         return sprintf(page, "%d\n", node->nd_local);
358 }
359
360 static ssize_t o2nm_node_local_write(struct o2nm_node *node, const char *page,
361                                      size_t count)
362 {
363         struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node);
364         unsigned long tmp;
365         char *p = (char *)page;
366         ssize_t ret;
367
368         tmp = simple_strtoul(p, &p, 0);
369         if (!p || (*p && (*p != '\n')))
370                 return -EINVAL;
371
372         tmp = !!tmp; /* boolean of whether this node wants to be local */
373
374         /* setting local turns on networking rx for now so we require having
375          * set everything else first */
376         if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
377             !test_bit(O2NM_NODE_ATTR_NUM, &node->nd_set_attributes) ||
378             !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
379                 return -EINVAL; /* XXX */
380
381         /* the only failure case is trying to set a new local node
382          * when a different one is already set */
383         if (tmp && tmp == cluster->cl_has_local &&
384             cluster->cl_local_node != node->nd_num)
385                 return -EBUSY;
386
387         /* bring up the rx thread if we're setting the new local node. */
388         if (tmp && !cluster->cl_has_local) {
389                 ret = o2net_start_listening(node);
390                 if (ret)
391                         return ret;
392         }
393
394         if (!tmp && cluster->cl_has_local &&
395             cluster->cl_local_node == node->nd_num) {
396                 o2net_stop_listening(node);
397                 cluster->cl_local_node = O2NM_INVALID_NODE_NUM;
398         }
399
400         node->nd_local = tmp;
401         if (node->nd_local) {
402                 cluster->cl_has_local = tmp;
403                 cluster->cl_local_node = node->nd_num;
404         }
405
406         return count;
407 }
408
409 struct o2nm_node_attribute {
410         struct configfs_attribute attr;
411         ssize_t (*show)(struct o2nm_node *, char *);
412         ssize_t (*store)(struct o2nm_node *, const char *, size_t);
413 };
414
415 static struct o2nm_node_attribute o2nm_node_attr_num = {
416         .attr   = { .ca_owner = THIS_MODULE,
417                     .ca_name = "num",
418                     .ca_mode = S_IRUGO | S_IWUSR },
419         .show   = o2nm_node_num_read,
420         .store  = o2nm_node_num_write,
421 };
422
423 static struct o2nm_node_attribute o2nm_node_attr_ipv4_port = {
424         .attr   = { .ca_owner = THIS_MODULE,
425                     .ca_name = "ipv4_port",
426                     .ca_mode = S_IRUGO | S_IWUSR },
427         .show   = o2nm_node_ipv4_port_read,
428         .store  = o2nm_node_ipv4_port_write,
429 };
430
431 static struct o2nm_node_attribute o2nm_node_attr_ipv4_address = {
432         .attr   = { .ca_owner = THIS_MODULE,
433                     .ca_name = "ipv4_address",
434                     .ca_mode = S_IRUGO | S_IWUSR },
435         .show   = o2nm_node_ipv4_address_read,
436         .store  = o2nm_node_ipv4_address_write,
437 };
438
439 static struct o2nm_node_attribute o2nm_node_attr_local = {
440         .attr   = { .ca_owner = THIS_MODULE,
441                     .ca_name = "local",
442                     .ca_mode = S_IRUGO | S_IWUSR },
443         .show   = o2nm_node_local_read,
444         .store  = o2nm_node_local_write,
445 };
446
447 static struct configfs_attribute *o2nm_node_attrs[] = {
448         [O2NM_NODE_ATTR_NUM] = &o2nm_node_attr_num.attr,
449         [O2NM_NODE_ATTR_PORT] = &o2nm_node_attr_ipv4_port.attr,
450         [O2NM_NODE_ATTR_ADDRESS] = &o2nm_node_attr_ipv4_address.attr,
451         [O2NM_NODE_ATTR_LOCAL] = &o2nm_node_attr_local.attr,
452         NULL,
453 };
454
455 static int o2nm_attr_index(struct configfs_attribute *attr)
456 {
457         int i;
458         for (i = 0; i < ARRAY_SIZE(o2nm_node_attrs); i++) {
459                 if (attr == o2nm_node_attrs[i])
460                         return i;
461         }
462         BUG();
463         return 0;
464 }
465
466 static ssize_t o2nm_node_show(struct config_item *item,
467                               struct configfs_attribute *attr,
468                               char *page)
469 {
470         struct o2nm_node *node = to_o2nm_node(item);
471         struct o2nm_node_attribute *o2nm_node_attr =
472                 container_of(attr, struct o2nm_node_attribute, attr);
473         ssize_t ret = 0;
474
475         if (o2nm_node_attr->show)
476                 ret = o2nm_node_attr->show(node, page);
477         return ret;
478 }
479
480 static ssize_t o2nm_node_store(struct config_item *item,
481                                struct configfs_attribute *attr,
482                                const char *page, size_t count)
483 {
484         struct o2nm_node *node = to_o2nm_node(item);
485         struct o2nm_node_attribute *o2nm_node_attr =
486                 container_of(attr, struct o2nm_node_attribute, attr);
487         ssize_t ret;
488         int attr_index = o2nm_attr_index(attr);
489
490         if (o2nm_node_attr->store == NULL) {
491                 ret = -EINVAL;
492                 goto out;
493         }
494
495         if (test_bit(attr_index, &node->nd_set_attributes))
496                 return -EBUSY;
497
498         ret = o2nm_node_attr->store(node, page, count);
499         if (ret < count)
500                 goto out;
501
502         set_bit(attr_index, &node->nd_set_attributes);
503 out:
504         return ret;
505 }
506
507 static struct configfs_item_operations o2nm_node_item_ops = {
508         .release                = o2nm_node_release,
509         .show_attribute         = o2nm_node_show,
510         .store_attribute        = o2nm_node_store,
511 };
512
513 static struct config_item_type o2nm_node_type = {
514         .ct_item_ops    = &o2nm_node_item_ops,
515         .ct_attrs       = o2nm_node_attrs,
516         .ct_owner       = THIS_MODULE,
517 };
518
519 /* node set */
520
521 struct o2nm_node_group {
522         struct config_group ns_group;
523         /* some stuff? */
524 };
525
526 #if 0
527 static struct o2nm_node_group *to_o2nm_node_group(struct config_group *group)
528 {
529         return group ?
530                 container_of(group, struct o2nm_node_group, ns_group)
531                 : NULL;
532 }
533 #endif
534
535 static struct config_item *o2nm_node_group_make_item(struct config_group *group,
536                                                      const char *name)
537 {
538         struct o2nm_node *node = NULL;
539         struct config_item *ret = NULL;
540
541         if (strlen(name) > O2NM_MAX_NAME_LEN)
542                 goto out; /* ENAMETOOLONG */
543
544         node = kcalloc(1, sizeof(struct o2nm_node), GFP_KERNEL);
545         if (node == NULL)
546                 goto out; /* ENOMEM */
547
548         strcpy(node->nd_name, name); /* use item.ci_namebuf instead? */
549         config_item_init_type_name(&node->nd_item, name, &o2nm_node_type);
550         spin_lock_init(&node->nd_lock);
551
552         ret = &node->nd_item;
553
554 out:
555         if (ret == NULL)
556                 kfree(node);
557
558         return ret;
559 }
560
561 static void o2nm_node_group_drop_item(struct config_group *group,
562                                       struct config_item *item)
563 {
564         struct o2nm_node *node = to_o2nm_node(item);
565         struct o2nm_cluster *cluster = to_o2nm_cluster(group->cg_item.ci_parent);
566
567         o2net_disconnect_node(node);
568
569         if (cluster->cl_has_local &&
570             (cluster->cl_local_node == node->nd_num)) {
571                 cluster->cl_has_local = 0;
572                 cluster->cl_local_node = O2NM_INVALID_NODE_NUM;
573                 o2net_stop_listening(node);
574         }
575
576         /* XXX call into net to stop this node from trading messages */
577
578         write_lock(&cluster->cl_nodes_lock);
579
580         /* XXX sloppy */
581         if (node->nd_ipv4_address)
582                 rb_erase(&node->nd_ip_node, &cluster->cl_node_ip_tree);
583
584         /* nd_num might be 0 if the node number hasn't been set.. */
585         if (cluster->cl_nodes[node->nd_num] == node) {
586                 cluster->cl_nodes[node->nd_num] = NULL;
587                 clear_bit(node->nd_num, cluster->cl_nodes_bitmap);
588         }
589         write_unlock(&cluster->cl_nodes_lock);
590
591         config_item_put(item);
592 }
593
594 static struct configfs_group_operations o2nm_node_group_group_ops = {
595         .make_item      = o2nm_node_group_make_item,
596         .drop_item      = o2nm_node_group_drop_item,
597 };
598
599 static struct config_item_type o2nm_node_group_type = {
600         .ct_group_ops   = &o2nm_node_group_group_ops,
601         .ct_owner       = THIS_MODULE,
602 };
603
604 /* cluster */
605
606 static void o2nm_cluster_release(struct config_item *item)
607 {
608         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
609
610         kfree(cluster->cl_group.default_groups);
611         kfree(cluster);
612 }
613
614 static struct configfs_item_operations o2nm_cluster_item_ops = {
615         .release        = o2nm_cluster_release,
616 };
617
618 static struct config_item_type o2nm_cluster_type = {
619         .ct_item_ops    = &o2nm_cluster_item_ops,
620         .ct_owner       = THIS_MODULE,
621 };
622
623 /* cluster set */
624
625 struct o2nm_cluster_group {
626         struct configfs_subsystem cs_subsys;
627         /* some stuff? */
628 };
629
630 #if 0
631 static struct o2nm_cluster_group *to_o2nm_cluster_group(struct config_group *group)
632 {
633         return group ?
634                 container_of(to_configfs_subsystem(group), struct o2nm_cluster_group, cs_subsys)
635                : NULL;
636 }
637 #endif
638
639 static struct config_group *o2nm_cluster_group_make_group(struct config_group *group,
640                                                           const char *name)
641 {
642         struct o2nm_cluster *cluster = NULL;
643         struct o2nm_node_group *ns = NULL;
644         struct config_group *o2hb_group = NULL, *ret = NULL;
645         void *defs = NULL;
646
647         /* this runs under the parent dir's i_mutex; there can be only
648          * one caller in here at a time */
649         if (o2nm_single_cluster)
650                 goto out; /* ENOSPC */
651
652         cluster = kcalloc(1, sizeof(struct o2nm_cluster), GFP_KERNEL);
653         ns = kcalloc(1, sizeof(struct o2nm_node_group), GFP_KERNEL);
654         defs = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
655         o2hb_group = o2hb_alloc_hb_set();
656         if (cluster == NULL || ns == NULL || o2hb_group == NULL || defs == NULL)
657                 goto out;
658
659         config_group_init_type_name(&cluster->cl_group, name,
660                                     &o2nm_cluster_type);
661         config_group_init_type_name(&ns->ns_group, "node",
662                                     &o2nm_node_group_type);
663
664         cluster->cl_group.default_groups = defs;
665         cluster->cl_group.default_groups[0] = &ns->ns_group;
666         cluster->cl_group.default_groups[1] = o2hb_group;
667         cluster->cl_group.default_groups[2] = NULL;
668         rwlock_init(&cluster->cl_nodes_lock);
669         cluster->cl_node_ip_tree = RB_ROOT;
670
671         ret = &cluster->cl_group;
672         o2nm_single_cluster = cluster;
673
674 out:
675         if (ret == NULL) {
676                 kfree(cluster);
677                 kfree(ns);
678                 o2hb_free_hb_set(o2hb_group);
679                 kfree(defs);
680         }
681
682         return ret;
683 }
684
685 static void o2nm_cluster_group_drop_item(struct config_group *group, struct config_item *item)
686 {
687         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
688         int i;
689         struct config_item *killme;
690
691         BUG_ON(o2nm_single_cluster != cluster);
692         o2nm_single_cluster = NULL;
693
694         for (i = 0; cluster->cl_group.default_groups[i]; i++) {
695                 killme = &cluster->cl_group.default_groups[i]->cg_item;
696                 cluster->cl_group.default_groups[i] = NULL;
697                 config_item_put(killme);
698         }
699
700         config_item_put(item);
701 }
702
703 static struct configfs_group_operations o2nm_cluster_group_group_ops = {
704         .make_group     = o2nm_cluster_group_make_group,
705         .drop_item      = o2nm_cluster_group_drop_item,
706 };
707
708 static struct config_item_type o2nm_cluster_group_type = {
709         .ct_group_ops   = &o2nm_cluster_group_group_ops,
710         .ct_owner       = THIS_MODULE,
711 };
712
713 static struct o2nm_cluster_group o2nm_cluster_group = {
714         .cs_subsys = {
715                 .su_group = {
716                         .cg_item = {
717                                 .ci_namebuf = "cluster",
718                                 .ci_type = &o2nm_cluster_group_type,
719                         },
720                 },
721         },
722 };
723
724 static void __exit exit_o2nm(void)
725 {
726         if (ocfs2_table_header)
727                 unregister_sysctl_table(ocfs2_table_header);
728
729         /* XXX sync with hb callbacks and shut down hb? */
730         o2net_unregister_hb_callbacks();
731         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
732         o2cb_sys_shutdown();
733
734         o2net_exit();
735 }
736
737 static int __init init_o2nm(void)
738 {
739         int ret = -1;
740
741         cluster_print_version();
742
743         o2hb_init();
744         o2net_init();
745
746         ocfs2_table_header = register_sysctl_table(ocfs2_root_table, 0);
747         if (!ocfs2_table_header) {
748                 printk(KERN_ERR "nodemanager: unable to register sysctl\n");
749                 ret = -ENOMEM; /* or something. */
750                 goto out_o2net;
751         }
752
753         ret = o2net_register_hb_callbacks();
754         if (ret)
755                 goto out_sysctl;
756
757         config_group_init(&o2nm_cluster_group.cs_subsys.su_group);
758         init_MUTEX(&o2nm_cluster_group.cs_subsys.su_sem);
759         ret = configfs_register_subsystem(&o2nm_cluster_group.cs_subsys);
760         if (ret) {
761                 printk(KERN_ERR "nodemanager: Registration returned %d\n", ret);
762                 goto out_callbacks;
763         }
764
765         ret = o2cb_sys_init();
766         if (!ret)
767                 goto out;
768
769         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
770 out_callbacks:
771         o2net_unregister_hb_callbacks();
772 out_sysctl:
773         unregister_sysctl_table(ocfs2_table_header);
774 out_o2net:
775         o2net_exit();
776 out:
777         return ret;
778 }
779
780 MODULE_AUTHOR("Oracle");
781 MODULE_LICENSE("GPL");
782
783 module_init(init_o2nm)
784 module_exit(exit_o2nm)