1 /******************************************************************************
2 *******************************************************************************
4 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5 ** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
7 ** This copyrighted material is made available to anyone wishing to use,
8 ** modify, copy, or redistribute it subject to the terms and conditions
9 ** of the GNU General Public License v.2.
11 *******************************************************************************
12 ******************************************************************************/
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/configfs.h>
17 #include <linux/slab.h>
19 #include <linux/in6.h>
20 #include <linux/dlmconstants.h>
28 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
29 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
30 * /config/dlm/<cluster>/comms/<comm>/nodeid
31 * /config/dlm/<cluster>/comms/<comm>/local
32 * /config/dlm/<cluster>/comms/<comm>/addr (write only)
33 * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
34 * The <cluster> level is useless, but I haven't figured out how to avoid it.
37 static struct config_group *space_list;
38 static struct config_group *comm_list;
39 static struct dlm_comm *local_comm;
40 static uint32_t dlm_comm_count;
51 static struct config_group *make_cluster(struct config_group *, const char *);
52 static void drop_cluster(struct config_group *, struct config_item *);
53 static void release_cluster(struct config_item *);
54 static struct config_group *make_space(struct config_group *, const char *);
55 static void drop_space(struct config_group *, struct config_item *);
56 static void release_space(struct config_item *);
57 static struct config_item *make_comm(struct config_group *, const char *);
58 static void drop_comm(struct config_group *, struct config_item *);
59 static void release_comm(struct config_item *);
60 static struct config_item *make_node(struct config_group *, const char *);
61 static void drop_node(struct config_group *, struct config_item *);
62 static void release_node(struct config_item *);
64 static struct configfs_attribute *comm_attrs[];
65 static struct configfs_attribute *node_attrs[];
68 struct config_group group;
69 unsigned int cl_tcp_port;
70 unsigned int cl_buffer_size;
71 unsigned int cl_rsbtbl_size;
72 unsigned int cl_recover_timer;
73 unsigned int cl_toss_secs;
74 unsigned int cl_scan_secs;
75 unsigned int cl_log_debug;
76 unsigned int cl_protocol;
77 unsigned int cl_timewarn_cs;
78 unsigned int cl_waitwarn_us;
79 unsigned int cl_new_rsb_count;
80 unsigned int cl_recover_callbacks;
81 char cl_cluster_name[DLM_LOCKSPACE_LEN];
84 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
86 return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
91 CLUSTER_ATTR_TCP_PORT = 0,
92 CLUSTER_ATTR_BUFFER_SIZE,
93 CLUSTER_ATTR_RSBTBL_SIZE,
94 CLUSTER_ATTR_RECOVER_TIMER,
95 CLUSTER_ATTR_TOSS_SECS,
96 CLUSTER_ATTR_SCAN_SECS,
97 CLUSTER_ATTR_LOG_DEBUG,
98 CLUSTER_ATTR_PROTOCOL,
99 CLUSTER_ATTR_TIMEWARN_CS,
100 CLUSTER_ATTR_WAITWARN_US,
101 CLUSTER_ATTR_NEW_RSB_COUNT,
102 CLUSTER_ATTR_RECOVER_CALLBACKS,
103 CLUSTER_ATTR_CLUSTER_NAME,
106 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
108 struct dlm_cluster *cl = config_item_to_cluster(item);
109 return sprintf(buf, "%s\n", cl->cl_cluster_name);
112 static ssize_t cluster_cluster_name_store(struct config_item *item,
113 const char *buf, size_t len)
115 struct dlm_cluster *cl = config_item_to_cluster(item);
117 strlcpy(dlm_config.ci_cluster_name, buf,
118 sizeof(dlm_config.ci_cluster_name));
119 strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
123 CONFIGFS_ATTR(cluster_, cluster_name);
125 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
126 int *info_field, int check_zero,
127 const char *buf, size_t len)
132 if (!capable(CAP_SYS_ADMIN))
134 rc = kstrtouint(buf, 0, &x);
138 if (check_zero && !x)
147 #define CLUSTER_ATTR(name, check_zero) \
148 static ssize_t cluster_##name##_store(struct config_item *item, \
149 const char *buf, size_t len) \
151 struct dlm_cluster *cl = config_item_to_cluster(item); \
152 return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \
153 check_zero, buf, len); \
155 static ssize_t cluster_##name##_show(struct config_item *item, char *buf) \
157 struct dlm_cluster *cl = config_item_to_cluster(item); \
158 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
160 CONFIGFS_ATTR(cluster_, name);
162 CLUSTER_ATTR(tcp_port, 1);
163 CLUSTER_ATTR(buffer_size, 1);
164 CLUSTER_ATTR(rsbtbl_size, 1);
165 CLUSTER_ATTR(recover_timer, 1);
166 CLUSTER_ATTR(toss_secs, 1);
167 CLUSTER_ATTR(scan_secs, 1);
168 CLUSTER_ATTR(log_debug, 0);
169 CLUSTER_ATTR(protocol, 0);
170 CLUSTER_ATTR(timewarn_cs, 1);
171 CLUSTER_ATTR(waitwarn_us, 0);
172 CLUSTER_ATTR(new_rsb_count, 0);
173 CLUSTER_ATTR(recover_callbacks, 0);
175 static struct configfs_attribute *cluster_attrs[] = {
176 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
177 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
178 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
179 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
180 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
181 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
182 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
183 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
184 [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
185 [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
186 [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
187 [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
188 [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
193 COMM_ATTR_NODEID = 0,
200 NODE_ATTR_NODEID = 0,
204 struct dlm_clusters {
205 struct configfs_subsystem subsys;
209 struct config_group ss_group;
213 struct config_group group;
214 struct list_head members;
215 struct mutex members_lock;
220 struct config_group cs_group;
224 struct config_item item;
229 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
233 struct config_group ns_group;
237 struct config_item item;
238 struct list_head list; /* space->members */
242 int comm_seq; /* copy of cm->seq when nd->nodeid is set */
245 static struct configfs_group_operations clusters_ops = {
246 .make_group = make_cluster,
247 .drop_item = drop_cluster,
250 static struct configfs_item_operations cluster_ops = {
251 .release = release_cluster,
254 static struct configfs_group_operations spaces_ops = {
255 .make_group = make_space,
256 .drop_item = drop_space,
259 static struct configfs_item_operations space_ops = {
260 .release = release_space,
263 static struct configfs_group_operations comms_ops = {
264 .make_item = make_comm,
265 .drop_item = drop_comm,
268 static struct configfs_item_operations comm_ops = {
269 .release = release_comm,
272 static struct configfs_group_operations nodes_ops = {
273 .make_item = make_node,
274 .drop_item = drop_node,
277 static struct configfs_item_operations node_ops = {
278 .release = release_node,
281 static struct config_item_type clusters_type = {
282 .ct_group_ops = &clusters_ops,
283 .ct_owner = THIS_MODULE,
286 static struct config_item_type cluster_type = {
287 .ct_item_ops = &cluster_ops,
288 .ct_attrs = cluster_attrs,
289 .ct_owner = THIS_MODULE,
292 static struct config_item_type spaces_type = {
293 .ct_group_ops = &spaces_ops,
294 .ct_owner = THIS_MODULE,
297 static struct config_item_type space_type = {
298 .ct_item_ops = &space_ops,
299 .ct_owner = THIS_MODULE,
302 static struct config_item_type comms_type = {
303 .ct_group_ops = &comms_ops,
304 .ct_owner = THIS_MODULE,
307 static struct config_item_type comm_type = {
308 .ct_item_ops = &comm_ops,
309 .ct_attrs = comm_attrs,
310 .ct_owner = THIS_MODULE,
313 static struct config_item_type nodes_type = {
314 .ct_group_ops = &nodes_ops,
315 .ct_owner = THIS_MODULE,
318 static struct config_item_type node_type = {
319 .ct_item_ops = &node_ops,
320 .ct_attrs = node_attrs,
321 .ct_owner = THIS_MODULE,
324 static struct dlm_space *config_item_to_space(struct config_item *i)
326 return i ? container_of(to_config_group(i), struct dlm_space, group) :
330 static struct dlm_comm *config_item_to_comm(struct config_item *i)
332 return i ? container_of(i, struct dlm_comm, item) : NULL;
335 static struct dlm_node *config_item_to_node(struct config_item *i)
337 return i ? container_of(i, struct dlm_node, item) : NULL;
340 static struct config_group *make_cluster(struct config_group *g,
343 struct dlm_cluster *cl = NULL;
344 struct dlm_spaces *sps = NULL;
345 struct dlm_comms *cms = NULL;
348 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
349 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
350 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
352 if (!cl || !gps || !sps || !cms)
355 config_group_init_type_name(&cl->group, name, &cluster_type);
356 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
357 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
359 configfs_add_default_group(&sps->ss_group, &cl->group);
360 configfs_add_default_group(&cms->cs_group, &cl->group);
362 cl->cl_tcp_port = dlm_config.ci_tcp_port;
363 cl->cl_buffer_size = dlm_config.ci_buffer_size;
364 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
365 cl->cl_recover_timer = dlm_config.ci_recover_timer;
366 cl->cl_toss_secs = dlm_config.ci_toss_secs;
367 cl->cl_scan_secs = dlm_config.ci_scan_secs;
368 cl->cl_log_debug = dlm_config.ci_log_debug;
369 cl->cl_protocol = dlm_config.ci_protocol;
370 cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
371 cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
372 cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
373 cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
374 memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
377 space_list = &sps->ss_group;
378 comm_list = &cms->cs_group;
385 return ERR_PTR(-ENOMEM);
388 static void drop_cluster(struct config_group *g, struct config_item *i)
390 struct dlm_cluster *cl = config_item_to_cluster(i);
392 configfs_remove_default_groups(&cl->group);
400 static void release_cluster(struct config_item *i)
402 struct dlm_cluster *cl = config_item_to_cluster(i);
406 static struct config_group *make_space(struct config_group *g, const char *name)
408 struct dlm_space *sp = NULL;
409 struct dlm_nodes *nds = NULL;
411 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
412 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
417 config_group_init_type_name(&sp->group, name, &space_type);
419 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
420 configfs_add_default_group(&nds->ns_group, &sp->group);
422 INIT_LIST_HEAD(&sp->members);
423 mutex_init(&sp->members_lock);
424 sp->members_count = 0;
430 return ERR_PTR(-ENOMEM);
433 static void drop_space(struct config_group *g, struct config_item *i)
435 struct dlm_space *sp = config_item_to_space(i);
437 /* assert list_empty(&sp->members) */
439 configfs_remove_default_groups(&sp->group);
443 static void release_space(struct config_item *i)
445 struct dlm_space *sp = config_item_to_space(i);
449 static struct config_item *make_comm(struct config_group *g, const char *name)
453 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
455 return ERR_PTR(-ENOMEM);
457 config_item_init_type_name(&cm->item, name, &comm_type);
459 cm->seq = dlm_comm_count++;
461 cm->seq = dlm_comm_count++;
469 static void drop_comm(struct config_group *g, struct config_item *i)
471 struct dlm_comm *cm = config_item_to_comm(i);
472 if (local_comm == cm)
474 dlm_lowcomms_close(cm->nodeid);
475 while (cm->addr_count--)
476 kfree(cm->addr[cm->addr_count]);
480 static void release_comm(struct config_item *i)
482 struct dlm_comm *cm = config_item_to_comm(i);
486 static struct config_item *make_node(struct config_group *g, const char *name)
488 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
491 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
493 return ERR_PTR(-ENOMEM);
495 config_item_init_type_name(&nd->item, name, &node_type);
497 nd->weight = 1; /* default weight of 1 if none is set */
498 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
500 mutex_lock(&sp->members_lock);
501 list_add(&nd->list, &sp->members);
503 mutex_unlock(&sp->members_lock);
508 static void drop_node(struct config_group *g, struct config_item *i)
510 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
511 struct dlm_node *nd = config_item_to_node(i);
513 mutex_lock(&sp->members_lock);
516 mutex_unlock(&sp->members_lock);
521 static void release_node(struct config_item *i)
523 struct dlm_node *nd = config_item_to_node(i);
527 static struct dlm_clusters clusters_root = {
532 .ci_type = &clusters_type,
538 int __init dlm_config_init(void)
540 config_group_init(&clusters_root.subsys.su_group);
541 mutex_init(&clusters_root.subsys.su_mutex);
542 return configfs_register_subsystem(&clusters_root.subsys);
545 void dlm_config_exit(void)
547 configfs_unregister_subsystem(&clusters_root.subsys);
551 * Functions for user space to read/write attributes
554 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
556 return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
559 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
562 int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
569 static ssize_t comm_local_show(struct config_item *item, char *buf)
571 return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
574 static ssize_t comm_local_store(struct config_item *item, const char *buf,
577 struct dlm_comm *cm = config_item_to_comm(item);
578 int rc = kstrtoint(buf, 0, &cm->local);
582 if (cm->local && !local_comm)
587 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
590 struct dlm_comm *cm = config_item_to_comm(item);
591 struct sockaddr_storage *addr;
594 if (len != sizeof(struct sockaddr_storage))
597 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
600 addr = kzalloc(sizeof(*addr), GFP_NOFS);
604 memcpy(addr, buf, len);
606 rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
612 cm->addr[cm->addr_count++] = addr;
616 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
618 struct dlm_comm *cm = config_item_to_comm(item);
622 struct sockaddr_storage *addr;
623 struct sockaddr_in *addr_in;
624 struct sockaddr_in6 *addr_in6;
626 /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
627 char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
630 /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
634 for (i = 0; i < cm->addr_count; i++) {
637 switch(addr->ss_family) {
639 addr_in = (struct sockaddr_in *)addr;
640 s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr);
643 addr_in6 = (struct sockaddr_in6 *)addr;
644 s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr);
647 s = sprintf(buf0, "%s\n", "<UNKNOWN>");
658 return 4096 - allowance;
661 CONFIGFS_ATTR(comm_, nodeid);
662 CONFIGFS_ATTR(comm_, local);
663 CONFIGFS_ATTR_WO(comm_, addr);
664 CONFIGFS_ATTR_RO(comm_, addr_list);
666 static struct configfs_attribute *comm_attrs[] = {
667 [COMM_ATTR_NODEID] = &comm_attr_nodeid,
668 [COMM_ATTR_LOCAL] = &comm_attr_local,
669 [COMM_ATTR_ADDR] = &comm_attr_addr,
670 [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
674 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
676 return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
679 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
682 struct dlm_node *nd = config_item_to_node(item);
684 int rc = kstrtoint(buf, 0, &nd->nodeid);
688 dlm_comm_seq(nd->nodeid, &seq);
693 static ssize_t node_weight_show(struct config_item *item, char *buf)
695 return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
698 static ssize_t node_weight_store(struct config_item *item, const char *buf,
701 int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
708 CONFIGFS_ATTR(node_, nodeid);
709 CONFIGFS_ATTR(node_, weight);
711 static struct configfs_attribute *node_attrs[] = {
712 [NODE_ATTR_NODEID] = &node_attr_nodeid,
713 [NODE_ATTR_WEIGHT] = &node_attr_weight,
718 * Functions for the dlm to get the info that's been configured
721 static struct dlm_space *get_space(char *name)
723 struct config_item *i;
728 mutex_lock(&space_list->cg_subsys->su_mutex);
729 i = config_group_find_item(space_list, name);
730 mutex_unlock(&space_list->cg_subsys->su_mutex);
732 return config_item_to_space(i);
735 static void put_space(struct dlm_space *sp)
737 config_item_put(&sp->group.cg_item);
740 static struct dlm_comm *get_comm(int nodeid)
742 struct config_item *i;
743 struct dlm_comm *cm = NULL;
749 mutex_lock(&clusters_root.subsys.su_mutex);
751 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
752 cm = config_item_to_comm(i);
754 if (cm->nodeid != nodeid)
760 mutex_unlock(&clusters_root.subsys.su_mutex);
767 static void put_comm(struct dlm_comm *cm)
769 config_item_put(&cm->item);
772 /* caller must free mem */
773 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
776 struct dlm_space *sp;
778 struct dlm_config_node *nodes, *node;
781 sp = get_space(lsname);
785 mutex_lock(&sp->members_lock);
786 if (!sp->members_count) {
788 printk(KERN_ERR "dlm: zero members_count\n");
792 count = sp->members_count;
794 nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
801 list_for_each_entry(nd, &sp->members, list) {
802 node->nodeid = nd->nodeid;
803 node->weight = nd->weight;
805 node->comm_seq = nd->comm_seq;
815 mutex_unlock(&sp->members_lock);
820 int dlm_comm_seq(int nodeid, uint32_t *seq)
822 struct dlm_comm *cm = get_comm(nodeid);
830 int dlm_our_nodeid(void)
832 return local_comm ? local_comm->nodeid : 0;
835 /* num 0 is first addr, num 1 is second addr */
836 int dlm_our_addr(struct sockaddr_storage *addr, int num)
840 if (num + 1 > local_comm->addr_count)
842 memcpy(addr, local_comm->addr[num], sizeof(*addr));
846 /* Config file defaults */
847 #define DEFAULT_TCP_PORT 21064
848 #define DEFAULT_BUFFER_SIZE 4096
849 #define DEFAULT_RSBTBL_SIZE 1024
850 #define DEFAULT_RECOVER_TIMER 5
851 #define DEFAULT_TOSS_SECS 10
852 #define DEFAULT_SCAN_SECS 5
853 #define DEFAULT_LOG_DEBUG 0
854 #define DEFAULT_PROTOCOL 0
855 #define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */
856 #define DEFAULT_WAITWARN_US 0
857 #define DEFAULT_NEW_RSB_COUNT 128
858 #define DEFAULT_RECOVER_CALLBACKS 0
859 #define DEFAULT_CLUSTER_NAME ""
861 struct dlm_config_info dlm_config = {
862 .ci_tcp_port = DEFAULT_TCP_PORT,
863 .ci_buffer_size = DEFAULT_BUFFER_SIZE,
864 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
865 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
866 .ci_toss_secs = DEFAULT_TOSS_SECS,
867 .ci_scan_secs = DEFAULT_SCAN_SECS,
868 .ci_log_debug = DEFAULT_LOG_DEBUG,
869 .ci_protocol = DEFAULT_PROTOCOL,
870 .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
871 .ci_waitwarn_us = DEFAULT_WAITWARN_US,
872 .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
873 .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
874 .ci_cluster_name = DEFAULT_CLUSTER_NAME