[patch 2/3] OCFS2 Configurable timeouts
[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 struct o2nm_cluster_attribute {
536         struct configfs_attribute attr;
537         ssize_t (*show)(struct o2nm_cluster *, char *);
538         ssize_t (*store)(struct o2nm_cluster *, const char *, size_t);
539 };
540
541 static ssize_t o2nm_cluster_attr_write(const char *page, ssize_t count,
542                                        unsigned int *val)
543 {
544         unsigned long tmp;
545         char *p = (char *)page;
546
547         tmp = simple_strtoul(p, &p, 0);
548         if (!p || (*p && (*p != '\n')))
549                 return -EINVAL;
550
551         if (tmp == 0)
552                 return -EINVAL;
553         if (tmp >= (u32)-1)
554                 return -ERANGE;
555
556         *val = tmp;
557
558         return count;
559 }
560
561 static ssize_t o2nm_cluster_attr_idle_timeout_ms_read(
562         struct o2nm_cluster *cluster, char *page)
563 {
564         return sprintf(page, "%u\n", cluster->cl_idle_timeout_ms);
565 }
566
567 static ssize_t o2nm_cluster_attr_idle_timeout_ms_write(
568         struct o2nm_cluster *cluster, const char *page, size_t count)
569 {
570         ssize_t ret;
571         unsigned int val;
572
573         ret =  o2nm_cluster_attr_write(page, count, &val);
574
575         if (ret > 0) {
576                 if (val <= cluster->cl_keepalive_delay_ms) {
577                         mlog(ML_NOTICE, "o2net: idle timeout must be larger "
578                              "than keepalive delay\n");
579                         return -EINVAL;
580                 }
581                 cluster->cl_idle_timeout_ms = val;
582         }
583
584         return ret;
585 }
586
587 static ssize_t o2nm_cluster_attr_keepalive_delay_ms_read(
588         struct o2nm_cluster *cluster, char *page)
589 {
590         return sprintf(page, "%u\n", cluster->cl_keepalive_delay_ms);
591 }
592
593 static ssize_t o2nm_cluster_attr_keepalive_delay_ms_write(
594         struct o2nm_cluster *cluster, const char *page, size_t count)
595 {
596         ssize_t ret;
597         unsigned int val;
598
599         ret =  o2nm_cluster_attr_write(page, count, &val);
600
601         if (ret > 0) {
602                 if (val >= cluster->cl_idle_timeout_ms) {
603                         mlog(ML_NOTICE, "o2net: keepalive delay must be "
604                              "smaller than idle timeout\n");
605                         return -EINVAL;
606                 }
607                 cluster->cl_keepalive_delay_ms = val;
608         }
609
610         return ret;
611 }
612
613 static ssize_t o2nm_cluster_attr_reconnect_delay_ms_read(
614         struct o2nm_cluster *cluster, char *page)
615 {
616         return sprintf(page, "%u\n", cluster->cl_reconnect_delay_ms);
617 }
618
619 static ssize_t o2nm_cluster_attr_reconnect_delay_ms_write(
620         struct o2nm_cluster *cluster, const char *page, size_t count)
621 {
622         return o2nm_cluster_attr_write(page, count,
623                                        &cluster->cl_reconnect_delay_ms);
624 }
625 static struct o2nm_cluster_attribute o2nm_cluster_attr_idle_timeout_ms = {
626         .attr   = { .ca_owner = THIS_MODULE,
627                     .ca_name = "idle_timeout_ms",
628                     .ca_mode = S_IRUGO | S_IWUSR },
629         .show   = o2nm_cluster_attr_idle_timeout_ms_read,
630         .store  = o2nm_cluster_attr_idle_timeout_ms_write,
631 };
632
633 static struct o2nm_cluster_attribute o2nm_cluster_attr_keepalive_delay_ms = {
634         .attr   = { .ca_owner = THIS_MODULE,
635                     .ca_name = "keepalive_delay_ms",
636                     .ca_mode = S_IRUGO | S_IWUSR },
637         .show   = o2nm_cluster_attr_keepalive_delay_ms_read,
638         .store  = o2nm_cluster_attr_keepalive_delay_ms_write,
639 };
640
641 static struct o2nm_cluster_attribute o2nm_cluster_attr_reconnect_delay_ms = {
642         .attr   = { .ca_owner = THIS_MODULE,
643                     .ca_name = "reconnect_delay_ms",
644                     .ca_mode = S_IRUGO | S_IWUSR },
645         .show   = o2nm_cluster_attr_reconnect_delay_ms_read,
646         .store  = o2nm_cluster_attr_reconnect_delay_ms_write,
647 };
648
649 static struct configfs_attribute *o2nm_cluster_attrs[] = {
650         &o2nm_cluster_attr_idle_timeout_ms.attr,
651         &o2nm_cluster_attr_keepalive_delay_ms.attr,
652         &o2nm_cluster_attr_reconnect_delay_ms.attr,
653         NULL,
654 };
655 static ssize_t o2nm_cluster_show(struct config_item *item,
656                                  struct configfs_attribute *attr,
657                                  char *page)
658 {
659         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
660         struct o2nm_cluster_attribute *o2nm_cluster_attr =
661                 container_of(attr, struct o2nm_cluster_attribute, attr);
662         ssize_t ret = 0;
663
664         if (o2nm_cluster_attr->show)
665                 ret = o2nm_cluster_attr->show(cluster, page);
666         return ret;
667 }
668
669 static ssize_t o2nm_cluster_store(struct config_item *item,
670                                   struct configfs_attribute *attr,
671                                   const char *page, size_t count)
672 {
673         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
674         struct o2nm_cluster_attribute *o2nm_cluster_attr =
675                 container_of(attr, struct o2nm_cluster_attribute, attr);
676         ssize_t ret;
677
678         if (o2nm_cluster_attr->store == NULL) {
679                 ret = -EINVAL;
680                 goto out;
681         }
682
683         ret = o2nm_cluster_attr->store(cluster, page, count);
684         if (ret < count)
685                 goto out;
686 out:
687         return ret;
688 }
689
690 static struct config_item *o2nm_node_group_make_item(struct config_group *group,
691                                                      const char *name)
692 {
693         struct o2nm_node *node = NULL;
694         struct config_item *ret = NULL;
695
696         if (strlen(name) > O2NM_MAX_NAME_LEN)
697                 goto out; /* ENAMETOOLONG */
698
699         node = kcalloc(1, sizeof(struct o2nm_node), GFP_KERNEL);
700         if (node == NULL)
701                 goto out; /* ENOMEM */
702
703         strcpy(node->nd_name, name); /* use item.ci_namebuf instead? */
704         config_item_init_type_name(&node->nd_item, name, &o2nm_node_type);
705         spin_lock_init(&node->nd_lock);
706
707         ret = &node->nd_item;
708
709 out:
710         if (ret == NULL)
711                 kfree(node);
712
713         return ret;
714 }
715
716 static void o2nm_node_group_drop_item(struct config_group *group,
717                                       struct config_item *item)
718 {
719         struct o2nm_node *node = to_o2nm_node(item);
720         struct o2nm_cluster *cluster = to_o2nm_cluster(group->cg_item.ci_parent);
721
722         o2net_disconnect_node(node);
723
724         if (cluster->cl_has_local &&
725             (cluster->cl_local_node == node->nd_num)) {
726                 cluster->cl_has_local = 0;
727                 cluster->cl_local_node = O2NM_INVALID_NODE_NUM;
728                 o2net_stop_listening(node);
729         }
730
731         /* XXX call into net to stop this node from trading messages */
732
733         write_lock(&cluster->cl_nodes_lock);
734
735         /* XXX sloppy */
736         if (node->nd_ipv4_address)
737                 rb_erase(&node->nd_ip_node, &cluster->cl_node_ip_tree);
738
739         /* nd_num might be 0 if the node number hasn't been set.. */
740         if (cluster->cl_nodes[node->nd_num] == node) {
741                 cluster->cl_nodes[node->nd_num] = NULL;
742                 clear_bit(node->nd_num, cluster->cl_nodes_bitmap);
743         }
744         write_unlock(&cluster->cl_nodes_lock);
745
746         config_item_put(item);
747 }
748
749 static struct configfs_group_operations o2nm_node_group_group_ops = {
750         .make_item      = o2nm_node_group_make_item,
751         .drop_item      = o2nm_node_group_drop_item,
752 };
753
754 static struct config_item_type o2nm_node_group_type = {
755         .ct_group_ops   = &o2nm_node_group_group_ops,
756         .ct_owner       = THIS_MODULE,
757 };
758
759 /* cluster */
760
761 static void o2nm_cluster_release(struct config_item *item)
762 {
763         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
764
765         kfree(cluster->cl_group.default_groups);
766         kfree(cluster);
767 }
768
769 static struct configfs_item_operations o2nm_cluster_item_ops = {
770         .release        = o2nm_cluster_release,
771         .show_attribute         = o2nm_cluster_show,
772         .store_attribute        = o2nm_cluster_store,
773 };
774
775 static struct config_item_type o2nm_cluster_type = {
776         .ct_item_ops    = &o2nm_cluster_item_ops,
777         .ct_attrs       = o2nm_cluster_attrs,
778         .ct_owner       = THIS_MODULE,
779 };
780
781 /* cluster set */
782
783 struct o2nm_cluster_group {
784         struct configfs_subsystem cs_subsys;
785         /* some stuff? */
786 };
787
788 #if 0
789 static struct o2nm_cluster_group *to_o2nm_cluster_group(struct config_group *group)
790 {
791         return group ?
792                 container_of(to_configfs_subsystem(group), struct o2nm_cluster_group, cs_subsys)
793                : NULL;
794 }
795 #endif
796
797 static struct config_group *o2nm_cluster_group_make_group(struct config_group *group,
798                                                           const char *name)
799 {
800         struct o2nm_cluster *cluster = NULL;
801         struct o2nm_node_group *ns = NULL;
802         struct config_group *o2hb_group = NULL, *ret = NULL;
803         void *defs = NULL;
804
805         /* this runs under the parent dir's i_mutex; there can be only
806          * one caller in here at a time */
807         if (o2nm_single_cluster)
808                 goto out; /* ENOSPC */
809
810         cluster = kcalloc(1, sizeof(struct o2nm_cluster), GFP_KERNEL);
811         ns = kcalloc(1, sizeof(struct o2nm_node_group), GFP_KERNEL);
812         defs = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
813         o2hb_group = o2hb_alloc_hb_set();
814         if (cluster == NULL || ns == NULL || o2hb_group == NULL || defs == NULL)
815                 goto out;
816
817         config_group_init_type_name(&cluster->cl_group, name,
818                                     &o2nm_cluster_type);
819         config_group_init_type_name(&ns->ns_group, "node",
820                                     &o2nm_node_group_type);
821
822         cluster->cl_group.default_groups = defs;
823         cluster->cl_group.default_groups[0] = &ns->ns_group;
824         cluster->cl_group.default_groups[1] = o2hb_group;
825         cluster->cl_group.default_groups[2] = NULL;
826         rwlock_init(&cluster->cl_nodes_lock);
827         cluster->cl_node_ip_tree = RB_ROOT;
828         cluster->cl_reconnect_delay_ms = O2NET_RECONNECT_DELAY_MS_DEFAULT;
829         cluster->cl_idle_timeout_ms    = O2NET_IDLE_TIMEOUT_MS_DEFAULT;
830         cluster->cl_keepalive_delay_ms = O2NET_KEEPALIVE_DELAY_MS_DEFAULT;
831
832         ret = &cluster->cl_group;
833         o2nm_single_cluster = cluster;
834
835 out:
836         if (ret == NULL) {
837                 kfree(cluster);
838                 kfree(ns);
839                 o2hb_free_hb_set(o2hb_group);
840                 kfree(defs);
841         }
842
843         return ret;
844 }
845
846 static void o2nm_cluster_group_drop_item(struct config_group *group, struct config_item *item)
847 {
848         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
849         int i;
850         struct config_item *killme;
851
852         BUG_ON(o2nm_single_cluster != cluster);
853         o2nm_single_cluster = NULL;
854
855         for (i = 0; cluster->cl_group.default_groups[i]; i++) {
856                 killme = &cluster->cl_group.default_groups[i]->cg_item;
857                 cluster->cl_group.default_groups[i] = NULL;
858                 config_item_put(killme);
859         }
860
861         config_item_put(item);
862 }
863
864 static struct configfs_group_operations o2nm_cluster_group_group_ops = {
865         .make_group     = o2nm_cluster_group_make_group,
866         .drop_item      = o2nm_cluster_group_drop_item,
867 };
868
869 static struct config_item_type o2nm_cluster_group_type = {
870         .ct_group_ops   = &o2nm_cluster_group_group_ops,
871         .ct_owner       = THIS_MODULE,
872 };
873
874 static struct o2nm_cluster_group o2nm_cluster_group = {
875         .cs_subsys = {
876                 .su_group = {
877                         .cg_item = {
878                                 .ci_namebuf = "cluster",
879                                 .ci_type = &o2nm_cluster_group_type,
880                         },
881                 },
882         },
883 };
884
885 static void __exit exit_o2nm(void)
886 {
887         if (ocfs2_table_header)
888                 unregister_sysctl_table(ocfs2_table_header);
889
890         /* XXX sync with hb callbacks and shut down hb? */
891         o2net_unregister_hb_callbacks();
892         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
893         o2cb_sys_shutdown();
894
895         o2net_exit();
896 }
897
898 static int __init init_o2nm(void)
899 {
900         int ret = -1;
901
902         cluster_print_version();
903
904         o2hb_init();
905         o2net_init();
906
907         ocfs2_table_header = register_sysctl_table(ocfs2_root_table, 0);
908         if (!ocfs2_table_header) {
909                 printk(KERN_ERR "nodemanager: unable to register sysctl\n");
910                 ret = -ENOMEM; /* or something. */
911                 goto out_o2net;
912         }
913
914         ret = o2net_register_hb_callbacks();
915         if (ret)
916                 goto out_sysctl;
917
918         config_group_init(&o2nm_cluster_group.cs_subsys.su_group);
919         init_MUTEX(&o2nm_cluster_group.cs_subsys.su_sem);
920         ret = configfs_register_subsystem(&o2nm_cluster_group.cs_subsys);
921         if (ret) {
922                 printk(KERN_ERR "nodemanager: Registration returned %d\n", ret);
923                 goto out_callbacks;
924         }
925
926         ret = o2cb_sys_init();
927         if (!ret)
928                 goto out;
929
930         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
931 out_callbacks:
932         o2net_unregister_hb_callbacks();
933 out_sysctl:
934         unregister_sysctl_table(ocfs2_table_header);
935 out_o2net:
936         o2net_exit();
937 out:
938         return ret;
939 }
940
941 MODULE_AUTHOR("Oracle");
942 MODULE_LICENSE("GPL");
943
944 module_init(init_o2nm)
945 module_exit(exit_o2nm)