[PATCH] ocfs2: remove non existing function prototypes
[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 static 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_cluster {
101         struct config_group     cl_group;
102         unsigned                cl_has_local:1;
103         u8                      cl_local_node;
104         rwlock_t                cl_nodes_lock;
105         struct o2nm_node        *cl_nodes[O2NM_MAX_NODES];
106         struct rb_root          cl_node_ip_tree;
107         /* this bitmap is part of a hack for disk bitmap.. will go eventually. - zab */
108         unsigned long   cl_nodes_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
109 };
110
111 struct o2nm_node *o2nm_get_node_by_num(u8 node_num)
112 {
113         struct o2nm_node *node = NULL;
114
115         if (node_num >= O2NM_MAX_NODES || o2nm_single_cluster == NULL)
116                 goto out;
117
118         read_lock(&o2nm_single_cluster->cl_nodes_lock);
119         node = o2nm_single_cluster->cl_nodes[node_num];
120         if (node)
121                 config_item_get(&node->nd_item);
122         read_unlock(&o2nm_single_cluster->cl_nodes_lock);
123 out:
124         return node;
125 }
126 EXPORT_SYMBOL_GPL(o2nm_get_node_by_num);
127
128 int o2nm_configured_node_map(unsigned long *map, unsigned bytes)
129 {
130         struct o2nm_cluster *cluster = o2nm_single_cluster;
131
132         BUG_ON(bytes < (sizeof(cluster->cl_nodes_bitmap)));
133
134         if (cluster == NULL)
135                 return -EINVAL;
136
137         read_lock(&cluster->cl_nodes_lock);
138         memcpy(map, cluster->cl_nodes_bitmap, sizeof(cluster->cl_nodes_bitmap));
139         read_unlock(&cluster->cl_nodes_lock);
140
141         return 0;
142 }
143 EXPORT_SYMBOL_GPL(o2nm_configured_node_map);
144
145 static struct o2nm_node *o2nm_node_ip_tree_lookup(struct o2nm_cluster *cluster,
146                                                   __be32 ip_needle,
147                                                   struct rb_node ***ret_p,
148                                                   struct rb_node **ret_parent)
149 {
150         struct rb_node **p = &cluster->cl_node_ip_tree.rb_node;
151         struct rb_node *parent = NULL;
152         struct o2nm_node *node, *ret = NULL;
153
154         while (*p) {
155                 parent = *p;
156                 node = rb_entry(parent, struct o2nm_node, nd_ip_node);
157
158                 if (memcmp(&ip_needle, &node->nd_ipv4_address,
159                            sizeof(ip_needle)) < 0)
160                         p = &(*p)->rb_left;
161                 else if (memcmp(&ip_needle, &node->nd_ipv4_address,
162                                 sizeof(ip_needle)) > 0)
163                         p = &(*p)->rb_right;
164                 else {
165                         ret = node;
166                         break;
167                 }
168         }
169
170         if (ret_p != NULL)
171                 *ret_p = p;
172         if (ret_parent != NULL)
173                 *ret_parent = parent;
174
175         return ret;
176 }
177
178 struct o2nm_node *o2nm_get_node_by_ip(__be32 addr)
179 {
180         struct o2nm_node *node = NULL;
181         struct o2nm_cluster *cluster = o2nm_single_cluster;
182
183         if (cluster == NULL)
184                 goto out;
185
186         read_lock(&cluster->cl_nodes_lock);
187         node = o2nm_node_ip_tree_lookup(cluster, addr, NULL, NULL);
188         if (node)
189                 config_item_get(&node->nd_item);
190         read_unlock(&cluster->cl_nodes_lock);
191
192 out:
193         return node;
194 }
195 EXPORT_SYMBOL_GPL(o2nm_get_node_by_ip);
196
197 void o2nm_node_put(struct o2nm_node *node)
198 {
199         config_item_put(&node->nd_item);
200 }
201 EXPORT_SYMBOL_GPL(o2nm_node_put);
202
203 void o2nm_node_get(struct o2nm_node *node)
204 {
205         config_item_get(&node->nd_item);
206 }
207 EXPORT_SYMBOL_GPL(o2nm_node_get);
208
209 u8 o2nm_this_node(void)
210 {
211         u8 node_num = O2NM_MAX_NODES;
212
213         if (o2nm_single_cluster && o2nm_single_cluster->cl_has_local)
214                 node_num = o2nm_single_cluster->cl_local_node;
215
216         return node_num;
217 }
218 EXPORT_SYMBOL_GPL(o2nm_this_node);
219
220 /* node configfs bits */
221
222 static struct o2nm_cluster *to_o2nm_cluster(struct config_item *item)
223 {
224         return item ?
225                 container_of(to_config_group(item), struct o2nm_cluster,
226                              cl_group)
227                 : NULL;
228 }
229
230 static struct o2nm_node *to_o2nm_node(struct config_item *item)
231 {
232         return item ? container_of(item, struct o2nm_node, nd_item) : NULL;
233 }
234
235 static void o2nm_node_release(struct config_item *item)
236 {
237         struct o2nm_node *node = to_o2nm_node(item);
238         kfree(node);
239 }
240
241 static ssize_t o2nm_node_num_read(struct o2nm_node *node, char *page)
242 {
243         return sprintf(page, "%d\n", node->nd_num);
244 }
245
246 static struct o2nm_cluster *to_o2nm_cluster_from_node(struct o2nm_node *node)
247 {
248         /* through the first node_set .parent
249          * mycluster/nodes/mynode == o2nm_cluster->o2nm_node_group->o2nm_node */
250         return to_o2nm_cluster(node->nd_item.ci_parent->ci_parent);
251 }
252
253 enum {
254         O2NM_NODE_ATTR_NUM = 0,
255         O2NM_NODE_ATTR_PORT,
256         O2NM_NODE_ATTR_ADDRESS,
257         O2NM_NODE_ATTR_LOCAL,
258 };
259
260 static ssize_t o2nm_node_num_write(struct o2nm_node *node, const char *page,
261                                    size_t count)
262 {
263         struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node);
264         unsigned long tmp;
265         char *p = (char *)page;
266
267         tmp = simple_strtoul(p, &p, 0);
268         if (!p || (*p && (*p != '\n')))
269                 return -EINVAL;
270
271         if (tmp >= O2NM_MAX_NODES)
272                 return -ERANGE;
273
274         /* once we're in the cl_nodes tree networking can look us up by
275          * node number and try to use our address and port attributes
276          * to connect to this node.. make sure that they've been set
277          * before writing the node attribute? */
278         if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
279             !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
280                 return -EINVAL; /* XXX */
281
282         write_lock(&cluster->cl_nodes_lock);
283         if (cluster->cl_nodes[tmp])
284                 p = NULL;
285         else  {
286                 cluster->cl_nodes[tmp] = node;
287                 node->nd_num = tmp;
288                 set_bit(tmp, cluster->cl_nodes_bitmap);
289         }
290         write_unlock(&cluster->cl_nodes_lock);
291         if (p == NULL)
292                 return -EEXIST;
293
294         return count;
295 }
296 static ssize_t o2nm_node_ipv4_port_read(struct o2nm_node *node, char *page)
297 {
298         return sprintf(page, "%u\n", ntohs(node->nd_ipv4_port));
299 }
300
301 static ssize_t o2nm_node_ipv4_port_write(struct o2nm_node *node,
302                                          const char *page, size_t count)
303 {
304         unsigned long tmp;
305         char *p = (char *)page;
306
307         tmp = simple_strtoul(p, &p, 0);
308         if (!p || (*p && (*p != '\n')))
309                 return -EINVAL;
310
311         if (tmp == 0)
312                 return -EINVAL;
313         if (tmp >= (u16)-1)
314                 return -ERANGE;
315
316         node->nd_ipv4_port = htons(tmp);
317
318         return count;
319 }
320
321 static ssize_t o2nm_node_ipv4_address_read(struct o2nm_node *node, char *page)
322 {
323         return sprintf(page, "%u.%u.%u.%u\n", NIPQUAD(node->nd_ipv4_address));
324 }
325
326 static ssize_t o2nm_node_ipv4_address_write(struct o2nm_node *node,
327                                             const char *page,
328                                             size_t count)
329 {
330         struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node);
331         int ret, i;
332         struct rb_node **p, *parent;
333         unsigned int octets[4];
334         __be32 ipv4_addr = 0;
335
336         ret = sscanf(page, "%3u.%3u.%3u.%3u", &octets[3], &octets[2],
337                      &octets[1], &octets[0]);
338         if (ret != 4)
339                 return -EINVAL;
340
341         for (i = 0; i < ARRAY_SIZE(octets); i++) {
342                 if (octets[i] > 255)
343                         return -ERANGE;
344                 be32_add_cpu(&ipv4_addr, octets[i] << (i * 8));
345         }
346
347         ret = 0;
348         write_lock(&cluster->cl_nodes_lock);
349         if (o2nm_node_ip_tree_lookup(cluster, ipv4_addr, &p, &parent))
350                 ret = -EEXIST;
351         else {
352                 rb_link_node(&node->nd_ip_node, parent, p);
353                 rb_insert_color(&node->nd_ip_node, &cluster->cl_node_ip_tree);
354         }
355         write_unlock(&cluster->cl_nodes_lock);
356         if (ret)
357                 return ret;
358
359         memcpy(&node->nd_ipv4_address, &ipv4_addr, sizeof(ipv4_addr));
360
361         return count;
362 }
363
364 static ssize_t o2nm_node_local_read(struct o2nm_node *node, char *page)
365 {
366         return sprintf(page, "%d\n", node->nd_local);
367 }
368
369 static ssize_t o2nm_node_local_write(struct o2nm_node *node, const char *page,
370                                      size_t count)
371 {
372         struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node);
373         unsigned long tmp;
374         char *p = (char *)page;
375         ssize_t ret;
376
377         tmp = simple_strtoul(p, &p, 0);
378         if (!p || (*p && (*p != '\n')))
379                 return -EINVAL;
380
381         tmp = !!tmp; /* boolean of whether this node wants to be local */
382
383         /* setting local turns on networking rx for now so we require having
384          * set everything else first */
385         if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
386             !test_bit(O2NM_NODE_ATTR_NUM, &node->nd_set_attributes) ||
387             !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
388                 return -EINVAL; /* XXX */
389
390         /* the only failure case is trying to set a new local node
391          * when a different one is already set */
392         if (tmp && tmp == cluster->cl_has_local &&
393             cluster->cl_local_node != node->nd_num)
394                 return -EBUSY;
395
396         /* bring up the rx thread if we're setting the new local node. */
397         if (tmp && !cluster->cl_has_local) {
398                 ret = o2net_start_listening(node);
399                 if (ret)
400                         return ret;
401         }
402
403         if (!tmp && cluster->cl_has_local &&
404             cluster->cl_local_node == node->nd_num) {
405                 o2net_stop_listening(node);
406                 cluster->cl_local_node = O2NM_INVALID_NODE_NUM;
407         }
408
409         node->nd_local = tmp;
410         if (node->nd_local) {
411                 cluster->cl_has_local = tmp;
412                 cluster->cl_local_node = node->nd_num;
413         }
414
415         return count;
416 }
417
418 struct o2nm_node_attribute {
419         struct configfs_attribute attr;
420         ssize_t (*show)(struct o2nm_node *, char *);
421         ssize_t (*store)(struct o2nm_node *, const char *, size_t);
422 };
423
424 static struct o2nm_node_attribute o2nm_node_attr_num = {
425         .attr   = { .ca_owner = THIS_MODULE,
426                     .ca_name = "num",
427                     .ca_mode = S_IRUGO | S_IWUSR },
428         .show   = o2nm_node_num_read,
429         .store  = o2nm_node_num_write,
430 };
431
432 static struct o2nm_node_attribute o2nm_node_attr_ipv4_port = {
433         .attr   = { .ca_owner = THIS_MODULE,
434                     .ca_name = "ipv4_port",
435                     .ca_mode = S_IRUGO | S_IWUSR },
436         .show   = o2nm_node_ipv4_port_read,
437         .store  = o2nm_node_ipv4_port_write,
438 };
439
440 static struct o2nm_node_attribute o2nm_node_attr_ipv4_address = {
441         .attr   = { .ca_owner = THIS_MODULE,
442                     .ca_name = "ipv4_address",
443                     .ca_mode = S_IRUGO | S_IWUSR },
444         .show   = o2nm_node_ipv4_address_read,
445         .store  = o2nm_node_ipv4_address_write,
446 };
447
448 static struct o2nm_node_attribute o2nm_node_attr_local = {
449         .attr   = { .ca_owner = THIS_MODULE,
450                     .ca_name = "local",
451                     .ca_mode = S_IRUGO | S_IWUSR },
452         .show   = o2nm_node_local_read,
453         .store  = o2nm_node_local_write,
454 };
455
456 static struct configfs_attribute *o2nm_node_attrs[] = {
457         [O2NM_NODE_ATTR_NUM] = &o2nm_node_attr_num.attr,
458         [O2NM_NODE_ATTR_PORT] = &o2nm_node_attr_ipv4_port.attr,
459         [O2NM_NODE_ATTR_ADDRESS] = &o2nm_node_attr_ipv4_address.attr,
460         [O2NM_NODE_ATTR_LOCAL] = &o2nm_node_attr_local.attr,
461         NULL,
462 };
463
464 static int o2nm_attr_index(struct configfs_attribute *attr)
465 {
466         int i;
467         for (i = 0; i < ARRAY_SIZE(o2nm_node_attrs); i++) {
468                 if (attr == o2nm_node_attrs[i])
469                         return i;
470         }
471         BUG();
472         return 0;
473 }
474
475 static ssize_t o2nm_node_show(struct config_item *item,
476                               struct configfs_attribute *attr,
477                               char *page)
478 {
479         struct o2nm_node *node = to_o2nm_node(item);
480         struct o2nm_node_attribute *o2nm_node_attr =
481                 container_of(attr, struct o2nm_node_attribute, attr);
482         ssize_t ret = 0;
483
484         if (o2nm_node_attr->show)
485                 ret = o2nm_node_attr->show(node, page);
486         return ret;
487 }
488
489 static ssize_t o2nm_node_store(struct config_item *item,
490                                struct configfs_attribute *attr,
491                                const char *page, size_t count)
492 {
493         struct o2nm_node *node = to_o2nm_node(item);
494         struct o2nm_node_attribute *o2nm_node_attr =
495                 container_of(attr, struct o2nm_node_attribute, attr);
496         ssize_t ret;
497         int attr_index = o2nm_attr_index(attr);
498
499         if (o2nm_node_attr->store == NULL) {
500                 ret = -EINVAL;
501                 goto out;
502         }
503
504         if (test_bit(attr_index, &node->nd_set_attributes))
505                 return -EBUSY;
506
507         ret = o2nm_node_attr->store(node, page, count);
508         if (ret < count)
509                 goto out;
510
511         set_bit(attr_index, &node->nd_set_attributes);
512 out:
513         return ret;
514 }
515
516 static struct configfs_item_operations o2nm_node_item_ops = {
517         .release                = o2nm_node_release,
518         .show_attribute         = o2nm_node_show,
519         .store_attribute        = o2nm_node_store,
520 };
521
522 static struct config_item_type o2nm_node_type = {
523         .ct_item_ops    = &o2nm_node_item_ops,
524         .ct_attrs       = o2nm_node_attrs,
525         .ct_owner       = THIS_MODULE,
526 };
527
528 /* node set */
529
530 struct o2nm_node_group {
531         struct config_group ns_group;
532         /* some stuff? */
533 };
534
535 #if 0
536 static struct o2nm_node_group *to_o2nm_node_group(struct config_group *group)
537 {
538         return group ?
539                 container_of(group, struct o2nm_node_group, ns_group)
540                 : NULL;
541 }
542 #endif
543
544 static struct config_item *o2nm_node_group_make_item(struct config_group *group,
545                                                      const char *name)
546 {
547         struct o2nm_node *node = NULL;
548         struct config_item *ret = NULL;
549
550         if (strlen(name) > O2NM_MAX_NAME_LEN)
551                 goto out; /* ENAMETOOLONG */
552
553         node = kcalloc(1, sizeof(struct o2nm_node), GFP_KERNEL);
554         if (node == NULL)
555                 goto out; /* ENOMEM */
556
557         strcpy(node->nd_name, name); /* use item.ci_namebuf instead? */
558         config_item_init_type_name(&node->nd_item, name, &o2nm_node_type);
559         spin_lock_init(&node->nd_lock);
560
561         ret = &node->nd_item;
562
563 out:
564         if (ret == NULL)
565                 kfree(node);
566
567         return ret;
568 }
569
570 static void o2nm_node_group_drop_item(struct config_group *group,
571                                       struct config_item *item)
572 {
573         struct o2nm_node *node = to_o2nm_node(item);
574         struct o2nm_cluster *cluster = to_o2nm_cluster(group->cg_item.ci_parent);
575
576         o2net_disconnect_node(node);
577
578         if (cluster->cl_has_local &&
579             (cluster->cl_local_node == node->nd_num)) {
580                 cluster->cl_has_local = 0;
581                 cluster->cl_local_node = O2NM_INVALID_NODE_NUM;
582                 o2net_stop_listening(node);
583         }
584
585         /* XXX call into net to stop this node from trading messages */
586
587         write_lock(&cluster->cl_nodes_lock);
588
589         /* XXX sloppy */
590         if (node->nd_ipv4_address)
591                 rb_erase(&node->nd_ip_node, &cluster->cl_node_ip_tree);
592
593         /* nd_num might be 0 if the node number hasn't been set.. */
594         if (cluster->cl_nodes[node->nd_num] == node) {
595                 cluster->cl_nodes[node->nd_num] = NULL;
596                 clear_bit(node->nd_num, cluster->cl_nodes_bitmap);
597         }
598         write_unlock(&cluster->cl_nodes_lock);
599
600         config_item_put(item);
601 }
602
603 static struct configfs_group_operations o2nm_node_group_group_ops = {
604         .make_item      = o2nm_node_group_make_item,
605         .drop_item      = o2nm_node_group_drop_item,
606 };
607
608 static struct config_item_type o2nm_node_group_type = {
609         .ct_group_ops   = &o2nm_node_group_group_ops,
610         .ct_owner       = THIS_MODULE,
611 };
612
613 /* cluster */
614
615 static void o2nm_cluster_release(struct config_item *item)
616 {
617         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
618
619         kfree(cluster->cl_group.default_groups);
620         kfree(cluster);
621 }
622
623 static struct configfs_item_operations o2nm_cluster_item_ops = {
624         .release        = o2nm_cluster_release,
625 };
626
627 static struct config_item_type o2nm_cluster_type = {
628         .ct_item_ops    = &o2nm_cluster_item_ops,
629         .ct_owner       = THIS_MODULE,
630 };
631
632 /* cluster set */
633
634 struct o2nm_cluster_group {
635         struct configfs_subsystem cs_subsys;
636         /* some stuff? */
637 };
638
639 #if 0
640 static struct o2nm_cluster_group *to_o2nm_cluster_group(struct config_group *group)
641 {
642         return group ?
643                 container_of(to_configfs_subsystem(group), struct o2nm_cluster_group, cs_subsys)
644                : NULL;
645 }
646 #endif
647
648 static struct config_group *o2nm_cluster_group_make_group(struct config_group *group,
649                                                           const char *name)
650 {
651         struct o2nm_cluster *cluster = NULL;
652         struct o2nm_node_group *ns = NULL;
653         struct config_group *o2hb_group = NULL, *ret = NULL;
654         void *defs = NULL;
655
656         /* this runs under the parent dir's i_mutex; there can be only
657          * one caller in here at a time */
658         if (o2nm_single_cluster)
659                 goto out; /* ENOSPC */
660
661         cluster = kcalloc(1, sizeof(struct o2nm_cluster), GFP_KERNEL);
662         ns = kcalloc(1, sizeof(struct o2nm_node_group), GFP_KERNEL);
663         defs = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
664         o2hb_group = o2hb_alloc_hb_set();
665         if (cluster == NULL || ns == NULL || o2hb_group == NULL || defs == NULL)
666                 goto out;
667
668         config_group_init_type_name(&cluster->cl_group, name,
669                                     &o2nm_cluster_type);
670         config_group_init_type_name(&ns->ns_group, "node",
671                                     &o2nm_node_group_type);
672
673         cluster->cl_group.default_groups = defs;
674         cluster->cl_group.default_groups[0] = &ns->ns_group;
675         cluster->cl_group.default_groups[1] = o2hb_group;
676         cluster->cl_group.default_groups[2] = NULL;
677         rwlock_init(&cluster->cl_nodes_lock);
678         cluster->cl_node_ip_tree = RB_ROOT;
679
680         ret = &cluster->cl_group;
681         o2nm_single_cluster = cluster;
682
683 out:
684         if (ret == NULL) {
685                 kfree(cluster);
686                 kfree(ns);
687                 o2hb_free_hb_set(o2hb_group);
688                 kfree(defs);
689         }
690
691         return ret;
692 }
693
694 static void o2nm_cluster_group_drop_item(struct config_group *group, struct config_item *item)
695 {
696         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
697         int i;
698         struct config_item *killme;
699
700         BUG_ON(o2nm_single_cluster != cluster);
701         o2nm_single_cluster = NULL;
702
703         for (i = 0; cluster->cl_group.default_groups[i]; i++) {
704                 killme = &cluster->cl_group.default_groups[i]->cg_item;
705                 cluster->cl_group.default_groups[i] = NULL;
706                 config_item_put(killme);
707         }
708
709         config_item_put(item);
710 }
711
712 static struct configfs_group_operations o2nm_cluster_group_group_ops = {
713         .make_group     = o2nm_cluster_group_make_group,
714         .drop_item      = o2nm_cluster_group_drop_item,
715 };
716
717 static struct config_item_type o2nm_cluster_group_type = {
718         .ct_group_ops   = &o2nm_cluster_group_group_ops,
719         .ct_owner       = THIS_MODULE,
720 };
721
722 static struct o2nm_cluster_group o2nm_cluster_group = {
723         .cs_subsys = {
724                 .su_group = {
725                         .cg_item = {
726                                 .ci_namebuf = "cluster",
727                                 .ci_type = &o2nm_cluster_group_type,
728                         },
729                 },
730         },
731 };
732
733 static void __exit exit_o2nm(void)
734 {
735         if (ocfs2_table_header)
736                 unregister_sysctl_table(ocfs2_table_header);
737
738         /* XXX sync with hb callbacks and shut down hb? */
739         o2net_unregister_hb_callbacks();
740         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
741         o2cb_sys_shutdown();
742
743         o2net_exit();
744 }
745
746 static int __init init_o2nm(void)
747 {
748         int ret = -1;
749
750         cluster_print_version();
751
752         o2hb_init();
753         o2net_init();
754
755         ocfs2_table_header = register_sysctl_table(ocfs2_root_table, 0);
756         if (!ocfs2_table_header) {
757                 printk(KERN_ERR "nodemanager: unable to register sysctl\n");
758                 ret = -ENOMEM; /* or something. */
759                 goto out;
760         }
761
762         ret = o2net_register_hb_callbacks();
763         if (ret)
764                 goto out_sysctl;
765
766         config_group_init(&o2nm_cluster_group.cs_subsys.su_group);
767         init_MUTEX(&o2nm_cluster_group.cs_subsys.su_sem);
768         ret = configfs_register_subsystem(&o2nm_cluster_group.cs_subsys);
769         if (ret) {
770                 printk(KERN_ERR "nodemanager: Registration returned %d\n", ret);
771                 goto out_callbacks;
772         }
773
774         ret = o2cb_sys_init();
775         if (!ret)
776                 goto out;
777
778         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
779 out_callbacks:
780         o2net_unregister_hb_callbacks();
781 out_sysctl:
782         unregister_sysctl_table(ocfs2_table_header);
783 out:
784         return ret;
785 }
786
787 MODULE_AUTHOR("Oracle");
788 MODULE_LICENSE("GPL");
789
790 module_init(init_o2nm)
791 module_exit(exit_o2nm)