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1/******************************************************************************
2*******************************************************************************
3**
4** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
6**
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.
10**
11*******************************************************************************
12******************************************************************************/
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/configfs.h>
17#include <linux/slab.h>
18#include <linux/in.h>
19#include <linux/in6.h>
20#include <linux/dlmconstants.h>
21#include <net/ipv6.h>
22#include <net/sock.h>
23
24#include "config.h"
25#include "lowcomms.h"
26
27/*
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.
35 */
36
37static struct config_group *space_list;
38static struct config_group *comm_list;
39static struct dlm_comm *local_comm;
40static uint32_t dlm_comm_count;
41
42struct dlm_clusters;
43struct dlm_cluster;
44struct dlm_spaces;
45struct dlm_space;
46struct dlm_comms;
47struct dlm_comm;
48struct dlm_nodes;
49struct dlm_node;
50
51static struct config_group *make_cluster(struct config_group *, const char *);
52static void drop_cluster(struct config_group *, struct config_item *);
53static void release_cluster(struct config_item *);
54static struct config_group *make_space(struct config_group *, const char *);
55static void drop_space(struct config_group *, struct config_item *);
56static void release_space(struct config_item *);
57static struct config_item *make_comm(struct config_group *, const char *);
58static void drop_comm(struct config_group *, struct config_item *);
59static void release_comm(struct config_item *);
60static struct config_item *make_node(struct config_group *, const char *);
61static void drop_node(struct config_group *, struct config_item *);
62static void release_node(struct config_item *);
63
64static struct configfs_attribute *comm_attrs[];
65static struct configfs_attribute *node_attrs[];
66
67struct dlm_cluster {
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];
82};
83
84static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
85{
86 return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
87 NULL;
88}
89
90enum {
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,
104};
105
106static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
107{
108 struct dlm_cluster *cl = config_item_to_cluster(item);
109 return sprintf(buf, "%s\n", cl->cl_cluster_name);
110}
111
112static ssize_t cluster_cluster_name_store(struct config_item *item,
113 const char *buf, size_t len)
114{
115 struct dlm_cluster *cl = config_item_to_cluster(item);
116
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));
120 return len;
121}
122
123CONFIGFS_ATTR(cluster_, cluster_name);
124
125static 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)
128{
129 unsigned int x;
130 int rc;
131
132 if (!capable(CAP_SYS_ADMIN))
133 return -EPERM;
134 rc = kstrtouint(buf, 0, &x);
135 if (rc)
136 return rc;
137
138 if (check_zero && !x)
139 return -EINVAL;
140
141 *cl_field = x;
142 *info_field = x;
143
144 return len;
145}
146
147#define CLUSTER_ATTR(name, check_zero) \
148static ssize_t cluster_##name##_store(struct config_item *item, \
149 const char *buf, size_t len) \
150{ \
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); \
154} \
155static ssize_t cluster_##name##_show(struct config_item *item, char *buf) \
156{ \
157 struct dlm_cluster *cl = config_item_to_cluster(item); \
158 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
159} \
160CONFIGFS_ATTR(cluster_, name);
161
162CLUSTER_ATTR(tcp_port, 1);
163CLUSTER_ATTR(buffer_size, 1);
164CLUSTER_ATTR(rsbtbl_size, 1);
165CLUSTER_ATTR(recover_timer, 1);
166CLUSTER_ATTR(toss_secs, 1);
167CLUSTER_ATTR(scan_secs, 1);
168CLUSTER_ATTR(log_debug, 0);
169CLUSTER_ATTR(protocol, 0);
170CLUSTER_ATTR(timewarn_cs, 1);
171CLUSTER_ATTR(waitwarn_us, 0);
172CLUSTER_ATTR(new_rsb_count, 0);
173CLUSTER_ATTR(recover_callbacks, 0);
174
175static 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,
189 NULL,
190};
191
192enum {
193 COMM_ATTR_NODEID = 0,
194 COMM_ATTR_LOCAL,
195 COMM_ATTR_ADDR,
196 COMM_ATTR_ADDR_LIST,
197};
198
199enum {
200 NODE_ATTR_NODEID = 0,
201 NODE_ATTR_WEIGHT,
202};
203
204struct dlm_clusters {
205 struct configfs_subsystem subsys;
206};
207
208struct dlm_spaces {
209 struct config_group ss_group;
210};
211
212struct dlm_space {
213 struct config_group group;
214 struct list_head members;
215 struct mutex members_lock;
216 int members_count;
217};
218
219struct dlm_comms {
220 struct config_group cs_group;
221};
222
223struct dlm_comm {
224 struct config_item item;
225 int seq;
226 int nodeid;
227 int local;
228 int addr_count;
229 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
230};
231
232struct dlm_nodes {
233 struct config_group ns_group;
234};
235
236struct dlm_node {
237 struct config_item item;
238 struct list_head list; /* space->members */
239 int nodeid;
240 int weight;
241 int new;
242 int comm_seq; /* copy of cm->seq when nd->nodeid is set */
243};
244
245static struct configfs_group_operations clusters_ops = {
246 .make_group = make_cluster,
247 .drop_item = drop_cluster,
248};
249
250static struct configfs_item_operations cluster_ops = {
251 .release = release_cluster,
252};
253
254static struct configfs_group_operations spaces_ops = {
255 .make_group = make_space,
256 .drop_item = drop_space,
257};
258
259static struct configfs_item_operations space_ops = {
260 .release = release_space,
261};
262
263static struct configfs_group_operations comms_ops = {
264 .make_item = make_comm,
265 .drop_item = drop_comm,
266};
267
268static struct configfs_item_operations comm_ops = {
269 .release = release_comm,
270};
271
272static struct configfs_group_operations nodes_ops = {
273 .make_item = make_node,
274 .drop_item = drop_node,
275};
276
277static struct configfs_item_operations node_ops = {
278 .release = release_node,
279};
280
281static struct config_item_type clusters_type = {
282 .ct_group_ops = &clusters_ops,
283 .ct_owner = THIS_MODULE,
284};
285
286static struct config_item_type cluster_type = {
287 .ct_item_ops = &cluster_ops,
288 .ct_attrs = cluster_attrs,
289 .ct_owner = THIS_MODULE,
290};
291
292static struct config_item_type spaces_type = {
293 .ct_group_ops = &spaces_ops,
294 .ct_owner = THIS_MODULE,
295};
296
297static struct config_item_type space_type = {
298 .ct_item_ops = &space_ops,
299 .ct_owner = THIS_MODULE,
300};
301
302static struct config_item_type comms_type = {
303 .ct_group_ops = &comms_ops,
304 .ct_owner = THIS_MODULE,
305};
306
307static struct config_item_type comm_type = {
308 .ct_item_ops = &comm_ops,
309 .ct_attrs = comm_attrs,
310 .ct_owner = THIS_MODULE,
311};
312
313static struct config_item_type nodes_type = {
314 .ct_group_ops = &nodes_ops,
315 .ct_owner = THIS_MODULE,
316};
317
318static struct config_item_type node_type = {
319 .ct_item_ops = &node_ops,
320 .ct_attrs = node_attrs,
321 .ct_owner = THIS_MODULE,
322};
323
324static struct dlm_space *config_item_to_space(struct config_item *i)
325{
326 return i ? container_of(to_config_group(i), struct dlm_space, group) :
327 NULL;
328}
329
330static struct dlm_comm *config_item_to_comm(struct config_item *i)
331{
332 return i ? container_of(i, struct dlm_comm, item) : NULL;
333}
334
335static struct dlm_node *config_item_to_node(struct config_item *i)
336{
337 return i ? container_of(i, struct dlm_node, item) : NULL;
338}
339
340static struct config_group *make_cluster(struct config_group *g,
341 const char *name)
342{
343 struct dlm_cluster *cl = NULL;
344 struct dlm_spaces *sps = NULL;
345 struct dlm_comms *cms = NULL;
346
347 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
348 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
349 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
350
351 if (!cl || !sps || !cms)
352 goto fail;
353
354 config_group_init_type_name(&cl->group, name, &cluster_type);
355 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
356 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
357
358 configfs_add_default_group(&sps->ss_group, &cl->group);
359 configfs_add_default_group(&cms->cs_group, &cl->group);
360
361 cl->cl_tcp_port = dlm_config.ci_tcp_port;
362 cl->cl_buffer_size = dlm_config.ci_buffer_size;
363 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
364 cl->cl_recover_timer = dlm_config.ci_recover_timer;
365 cl->cl_toss_secs = dlm_config.ci_toss_secs;
366 cl->cl_scan_secs = dlm_config.ci_scan_secs;
367 cl->cl_log_debug = dlm_config.ci_log_debug;
368 cl->cl_protocol = dlm_config.ci_protocol;
369 cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
370 cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
371 cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
372 cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
373 memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
374 DLM_LOCKSPACE_LEN);
375
376 space_list = &sps->ss_group;
377 comm_list = &cms->cs_group;
378 return &cl->group;
379
380 fail:
381 kfree(cl);
382 kfree(sps);
383 kfree(cms);
384 return ERR_PTR(-ENOMEM);
385}
386
387static void drop_cluster(struct config_group *g, struct config_item *i)
388{
389 struct dlm_cluster *cl = config_item_to_cluster(i);
390
391 configfs_remove_default_groups(&cl->group);
392
393 space_list = NULL;
394 comm_list = NULL;
395
396 config_item_put(i);
397}
398
399static void release_cluster(struct config_item *i)
400{
401 struct dlm_cluster *cl = config_item_to_cluster(i);
402 kfree(cl);
403}
404
405static struct config_group *make_space(struct config_group *g, const char *name)
406{
407 struct dlm_space *sp = NULL;
408 struct dlm_nodes *nds = NULL;
409
410 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
411 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
412
413 if (!sp || !nds)
414 goto fail;
415
416 config_group_init_type_name(&sp->group, name, &space_type);
417
418 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
419 configfs_add_default_group(&nds->ns_group, &sp->group);
420
421 INIT_LIST_HEAD(&sp->members);
422 mutex_init(&sp->members_lock);
423 sp->members_count = 0;
424 return &sp->group;
425
426 fail:
427 kfree(sp);
428 kfree(nds);
429 return ERR_PTR(-ENOMEM);
430}
431
432static void drop_space(struct config_group *g, struct config_item *i)
433{
434 struct dlm_space *sp = config_item_to_space(i);
435
436 /* assert list_empty(&sp->members) */
437
438 configfs_remove_default_groups(&sp->group);
439 config_item_put(i);
440}
441
442static void release_space(struct config_item *i)
443{
444 struct dlm_space *sp = config_item_to_space(i);
445 kfree(sp);
446}
447
448static struct config_item *make_comm(struct config_group *g, const char *name)
449{
450 struct dlm_comm *cm;
451
452 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
453 if (!cm)
454 return ERR_PTR(-ENOMEM);
455
456 config_item_init_type_name(&cm->item, name, &comm_type);
457
458 cm->seq = dlm_comm_count++;
459 if (!cm->seq)
460 cm->seq = dlm_comm_count++;
461
462 cm->nodeid = -1;
463 cm->local = 0;
464 cm->addr_count = 0;
465 return &cm->item;
466}
467
468static void drop_comm(struct config_group *g, struct config_item *i)
469{
470 struct dlm_comm *cm = config_item_to_comm(i);
471 if (local_comm == cm)
472 local_comm = NULL;
473 dlm_lowcomms_close(cm->nodeid);
474 while (cm->addr_count--)
475 kfree(cm->addr[cm->addr_count]);
476 config_item_put(i);
477}
478
479static void release_comm(struct config_item *i)
480{
481 struct dlm_comm *cm = config_item_to_comm(i);
482 kfree(cm);
483}
484
485static struct config_item *make_node(struct config_group *g, const char *name)
486{
487 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
488 struct dlm_node *nd;
489
490 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
491 if (!nd)
492 return ERR_PTR(-ENOMEM);
493
494 config_item_init_type_name(&nd->item, name, &node_type);
495 nd->nodeid = -1;
496 nd->weight = 1; /* default weight of 1 if none is set */
497 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
498
499 mutex_lock(&sp->members_lock);
500 list_add(&nd->list, &sp->members);
501 sp->members_count++;
502 mutex_unlock(&sp->members_lock);
503
504 return &nd->item;
505}
506
507static void drop_node(struct config_group *g, struct config_item *i)
508{
509 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
510 struct dlm_node *nd = config_item_to_node(i);
511
512 mutex_lock(&sp->members_lock);
513 list_del(&nd->list);
514 sp->members_count--;
515 mutex_unlock(&sp->members_lock);
516
517 config_item_put(i);
518}
519
520static void release_node(struct config_item *i)
521{
522 struct dlm_node *nd = config_item_to_node(i);
523 kfree(nd);
524}
525
526static struct dlm_clusters clusters_root = {
527 .subsys = {
528 .su_group = {
529 .cg_item = {
530 .ci_namebuf = "dlm",
531 .ci_type = &clusters_type,
532 },
533 },
534 },
535};
536
537int __init dlm_config_init(void)
538{
539 config_group_init(&clusters_root.subsys.su_group);
540 mutex_init(&clusters_root.subsys.su_mutex);
541 return configfs_register_subsystem(&clusters_root.subsys);
542}
543
544void dlm_config_exit(void)
545{
546 configfs_unregister_subsystem(&clusters_root.subsys);
547}
548
549/*
550 * Functions for user space to read/write attributes
551 */
552
553static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
554{
555 return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
556}
557
558static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
559 size_t len)
560{
561 int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
562
563 if (rc)
564 return rc;
565 return len;
566}
567
568static ssize_t comm_local_show(struct config_item *item, char *buf)
569{
570 return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
571}
572
573static ssize_t comm_local_store(struct config_item *item, const char *buf,
574 size_t len)
575{
576 struct dlm_comm *cm = config_item_to_comm(item);
577 int rc = kstrtoint(buf, 0, &cm->local);
578
579 if (rc)
580 return rc;
581 if (cm->local && !local_comm)
582 local_comm = cm;
583 return len;
584}
585
586static ssize_t comm_addr_store(struct config_item *item, const char *buf,
587 size_t len)
588{
589 struct dlm_comm *cm = config_item_to_comm(item);
590 struct sockaddr_storage *addr;
591 int rv;
592
593 if (len != sizeof(struct sockaddr_storage))
594 return -EINVAL;
595
596 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
597 return -ENOSPC;
598
599 addr = kzalloc(sizeof(*addr), GFP_NOFS);
600 if (!addr)
601 return -ENOMEM;
602
603 memcpy(addr, buf, len);
604
605 rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
606 if (rv) {
607 kfree(addr);
608 return rv;
609 }
610
611 cm->addr[cm->addr_count++] = addr;
612 return len;
613}
614
615static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
616{
617 struct dlm_comm *cm = config_item_to_comm(item);
618 ssize_t s;
619 ssize_t allowance;
620 int i;
621 struct sockaddr_storage *addr;
622 struct sockaddr_in *addr_in;
623 struct sockaddr_in6 *addr_in6;
624
625 /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
626 char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
627
628
629 /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
630 allowance = 4096;
631 buf[0] = '\0';
632
633 for (i = 0; i < cm->addr_count; i++) {
634 addr = cm->addr[i];
635
636 switch(addr->ss_family) {
637 case AF_INET:
638 addr_in = (struct sockaddr_in *)addr;
639 s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr);
640 break;
641 case AF_INET6:
642 addr_in6 = (struct sockaddr_in6 *)addr;
643 s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr);
644 break;
645 default:
646 s = sprintf(buf0, "%s\n", "<UNKNOWN>");
647 break;
648 }
649 allowance -= s;
650 if (allowance >= 0)
651 strcat(buf, buf0);
652 else {
653 allowance += s;
654 break;
655 }
656 }
657 return 4096 - allowance;
658}
659
660CONFIGFS_ATTR(comm_, nodeid);
661CONFIGFS_ATTR(comm_, local);
662CONFIGFS_ATTR_WO(comm_, addr);
663CONFIGFS_ATTR_RO(comm_, addr_list);
664
665static struct configfs_attribute *comm_attrs[] = {
666 [COMM_ATTR_NODEID] = &comm_attr_nodeid,
667 [COMM_ATTR_LOCAL] = &comm_attr_local,
668 [COMM_ATTR_ADDR] = &comm_attr_addr,
669 [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
670 NULL,
671};
672
673static ssize_t node_nodeid_show(struct config_item *item, char *buf)
674{
675 return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
676}
677
678static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
679 size_t len)
680{
681 struct dlm_node *nd = config_item_to_node(item);
682 uint32_t seq = 0;
683 int rc = kstrtoint(buf, 0, &nd->nodeid);
684
685 if (rc)
686 return rc;
687 dlm_comm_seq(nd->nodeid, &seq);
688 nd->comm_seq = seq;
689 return len;
690}
691
692static ssize_t node_weight_show(struct config_item *item, char *buf)
693{
694 return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
695}
696
697static ssize_t node_weight_store(struct config_item *item, const char *buf,
698 size_t len)
699{
700 int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
701
702 if (rc)
703 return rc;
704 return len;
705}
706
707CONFIGFS_ATTR(node_, nodeid);
708CONFIGFS_ATTR(node_, weight);
709
710static struct configfs_attribute *node_attrs[] = {
711 [NODE_ATTR_NODEID] = &node_attr_nodeid,
712 [NODE_ATTR_WEIGHT] = &node_attr_weight,
713 NULL,
714};
715
716/*
717 * Functions for the dlm to get the info that's been configured
718 */
719
720static struct dlm_space *get_space(char *name)
721{
722 struct config_item *i;
723
724 if (!space_list)
725 return NULL;
726
727 mutex_lock(&space_list->cg_subsys->su_mutex);
728 i = config_group_find_item(space_list, name);
729 mutex_unlock(&space_list->cg_subsys->su_mutex);
730
731 return config_item_to_space(i);
732}
733
734static void put_space(struct dlm_space *sp)
735{
736 config_item_put(&sp->group.cg_item);
737}
738
739static struct dlm_comm *get_comm(int nodeid)
740{
741 struct config_item *i;
742 struct dlm_comm *cm = NULL;
743 int found = 0;
744
745 if (!comm_list)
746 return NULL;
747
748 mutex_lock(&clusters_root.subsys.su_mutex);
749
750 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
751 cm = config_item_to_comm(i);
752
753 if (cm->nodeid != nodeid)
754 continue;
755 found = 1;
756 config_item_get(i);
757 break;
758 }
759 mutex_unlock(&clusters_root.subsys.su_mutex);
760
761 if (!found)
762 cm = NULL;
763 return cm;
764}
765
766static void put_comm(struct dlm_comm *cm)
767{
768 config_item_put(&cm->item);
769}
770
771/* caller must free mem */
772int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
773 int *count_out)
774{
775 struct dlm_space *sp;
776 struct dlm_node *nd;
777 struct dlm_config_node *nodes, *node;
778 int rv, count;
779
780 sp = get_space(lsname);
781 if (!sp)
782 return -EEXIST;
783
784 mutex_lock(&sp->members_lock);
785 if (!sp->members_count) {
786 rv = -EINVAL;
787 printk(KERN_ERR "dlm: zero members_count\n");
788 goto out;
789 }
790
791 count = sp->members_count;
792
793 nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
794 if (!nodes) {
795 rv = -ENOMEM;
796 goto out;
797 }
798
799 node = nodes;
800 list_for_each_entry(nd, &sp->members, list) {
801 node->nodeid = nd->nodeid;
802 node->weight = nd->weight;
803 node->new = nd->new;
804 node->comm_seq = nd->comm_seq;
805 node++;
806
807 nd->new = 0;
808 }
809
810 *count_out = count;
811 *nodes_out = nodes;
812 rv = 0;
813 out:
814 mutex_unlock(&sp->members_lock);
815 put_space(sp);
816 return rv;
817}
818
819int dlm_comm_seq(int nodeid, uint32_t *seq)
820{
821 struct dlm_comm *cm = get_comm(nodeid);
822 if (!cm)
823 return -EEXIST;
824 *seq = cm->seq;
825 put_comm(cm);
826 return 0;
827}
828
829int dlm_our_nodeid(void)
830{
831 return local_comm ? local_comm->nodeid : 0;
832}
833
834/* num 0 is first addr, num 1 is second addr */
835int dlm_our_addr(struct sockaddr_storage *addr, int num)
836{
837 if (!local_comm)
838 return -1;
839 if (num + 1 > local_comm->addr_count)
840 return -1;
841 memcpy(addr, local_comm->addr[num], sizeof(*addr));
842 return 0;
843}
844
845/* Config file defaults */
846#define DEFAULT_TCP_PORT 21064
847#define DEFAULT_BUFFER_SIZE 4096
848#define DEFAULT_RSBTBL_SIZE 1024
849#define DEFAULT_RECOVER_TIMER 5
850#define DEFAULT_TOSS_SECS 10
851#define DEFAULT_SCAN_SECS 5
852#define DEFAULT_LOG_DEBUG 0
853#define DEFAULT_PROTOCOL 0
854#define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */
855#define DEFAULT_WAITWARN_US 0
856#define DEFAULT_NEW_RSB_COUNT 128
857#define DEFAULT_RECOVER_CALLBACKS 0
858#define DEFAULT_CLUSTER_NAME ""
859
860struct dlm_config_info dlm_config = {
861 .ci_tcp_port = DEFAULT_TCP_PORT,
862 .ci_buffer_size = DEFAULT_BUFFER_SIZE,
863 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
864 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
865 .ci_toss_secs = DEFAULT_TOSS_SECS,
866 .ci_scan_secs = DEFAULT_SCAN_SECS,
867 .ci_log_debug = DEFAULT_LOG_DEBUG,
868 .ci_protocol = DEFAULT_PROTOCOL,
869 .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
870 .ci_waitwarn_us = DEFAULT_WAITWARN_US,
871 .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
872 .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
873 .ci_cluster_name = DEFAULT_CLUSTER_NAME
874};
875
1/******************************************************************************
2*******************************************************************************
3**
4** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
6**
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.
10**
11*******************************************************************************
12******************************************************************************/
13
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/configfs.h>
17#include <linux/slab.h>
18#include <linux/in.h>
19#include <linux/in6.h>
20#include <linux/dlmconstants.h>
21#include <net/ipv6.h>
22#include <net/sock.h>
23
24#include "config.h"
25#include "lowcomms.h"
26
27/*
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.
35 */
36
37static struct config_group *space_list;
38static struct config_group *comm_list;
39static struct dlm_comm *local_comm;
40static uint32_t dlm_comm_count;
41
42struct dlm_clusters;
43struct dlm_cluster;
44struct dlm_spaces;
45struct dlm_space;
46struct dlm_comms;
47struct dlm_comm;
48struct dlm_nodes;
49struct dlm_node;
50
51static struct config_group *make_cluster(struct config_group *, const char *);
52static void drop_cluster(struct config_group *, struct config_item *);
53static void release_cluster(struct config_item *);
54static struct config_group *make_space(struct config_group *, const char *);
55static void drop_space(struct config_group *, struct config_item *);
56static void release_space(struct config_item *);
57static struct config_item *make_comm(struct config_group *, const char *);
58static void drop_comm(struct config_group *, struct config_item *);
59static void release_comm(struct config_item *);
60static struct config_item *make_node(struct config_group *, const char *);
61static void drop_node(struct config_group *, struct config_item *);
62static void release_node(struct config_item *);
63
64static struct configfs_attribute *comm_attrs[];
65static struct configfs_attribute *node_attrs[];
66
67struct dlm_cluster {
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_log_info;
77 unsigned int cl_protocol;
78 unsigned int cl_timewarn_cs;
79 unsigned int cl_waitwarn_us;
80 unsigned int cl_new_rsb_count;
81 unsigned int cl_recover_callbacks;
82 char cl_cluster_name[DLM_LOCKSPACE_LEN];
83};
84
85static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
86{
87 return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
88 NULL;
89}
90
91enum {
92 CLUSTER_ATTR_TCP_PORT = 0,
93 CLUSTER_ATTR_BUFFER_SIZE,
94 CLUSTER_ATTR_RSBTBL_SIZE,
95 CLUSTER_ATTR_RECOVER_TIMER,
96 CLUSTER_ATTR_TOSS_SECS,
97 CLUSTER_ATTR_SCAN_SECS,
98 CLUSTER_ATTR_LOG_DEBUG,
99 CLUSTER_ATTR_LOG_INFO,
100 CLUSTER_ATTR_PROTOCOL,
101 CLUSTER_ATTR_TIMEWARN_CS,
102 CLUSTER_ATTR_WAITWARN_US,
103 CLUSTER_ATTR_NEW_RSB_COUNT,
104 CLUSTER_ATTR_RECOVER_CALLBACKS,
105 CLUSTER_ATTR_CLUSTER_NAME,
106};
107
108static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
109{
110 struct dlm_cluster *cl = config_item_to_cluster(item);
111 return sprintf(buf, "%s\n", cl->cl_cluster_name);
112}
113
114static ssize_t cluster_cluster_name_store(struct config_item *item,
115 const char *buf, size_t len)
116{
117 struct dlm_cluster *cl = config_item_to_cluster(item);
118
119 strlcpy(dlm_config.ci_cluster_name, buf,
120 sizeof(dlm_config.ci_cluster_name));
121 strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
122 return len;
123}
124
125CONFIGFS_ATTR(cluster_, cluster_name);
126
127static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
128 int *info_field, int check_zero,
129 const char *buf, size_t len)
130{
131 unsigned int x;
132 int rc;
133
134 if (!capable(CAP_SYS_ADMIN))
135 return -EPERM;
136 rc = kstrtouint(buf, 0, &x);
137 if (rc)
138 return rc;
139
140 if (check_zero && !x)
141 return -EINVAL;
142
143 *cl_field = x;
144 *info_field = x;
145
146 return len;
147}
148
149#define CLUSTER_ATTR(name, check_zero) \
150static ssize_t cluster_##name##_store(struct config_item *item, \
151 const char *buf, size_t len) \
152{ \
153 struct dlm_cluster *cl = config_item_to_cluster(item); \
154 return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \
155 check_zero, buf, len); \
156} \
157static ssize_t cluster_##name##_show(struct config_item *item, char *buf) \
158{ \
159 struct dlm_cluster *cl = config_item_to_cluster(item); \
160 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
161} \
162CONFIGFS_ATTR(cluster_, name);
163
164CLUSTER_ATTR(tcp_port, 1);
165CLUSTER_ATTR(buffer_size, 1);
166CLUSTER_ATTR(rsbtbl_size, 1);
167CLUSTER_ATTR(recover_timer, 1);
168CLUSTER_ATTR(toss_secs, 1);
169CLUSTER_ATTR(scan_secs, 1);
170CLUSTER_ATTR(log_debug, 0);
171CLUSTER_ATTR(log_info, 0);
172CLUSTER_ATTR(protocol, 0);
173CLUSTER_ATTR(timewarn_cs, 1);
174CLUSTER_ATTR(waitwarn_us, 0);
175CLUSTER_ATTR(new_rsb_count, 0);
176CLUSTER_ATTR(recover_callbacks, 0);
177
178static struct configfs_attribute *cluster_attrs[] = {
179 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
180 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
181 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
182 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
183 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
184 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
185 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
186 [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
187 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
188 [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
189 [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
190 [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
191 [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
192 [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
193 NULL,
194};
195
196enum {
197 COMM_ATTR_NODEID = 0,
198 COMM_ATTR_LOCAL,
199 COMM_ATTR_ADDR,
200 COMM_ATTR_ADDR_LIST,
201};
202
203enum {
204 NODE_ATTR_NODEID = 0,
205 NODE_ATTR_WEIGHT,
206};
207
208struct dlm_clusters {
209 struct configfs_subsystem subsys;
210};
211
212struct dlm_spaces {
213 struct config_group ss_group;
214};
215
216struct dlm_space {
217 struct config_group group;
218 struct list_head members;
219 struct mutex members_lock;
220 int members_count;
221};
222
223struct dlm_comms {
224 struct config_group cs_group;
225};
226
227struct dlm_comm {
228 struct config_item item;
229 int seq;
230 int nodeid;
231 int local;
232 int addr_count;
233 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
234};
235
236struct dlm_nodes {
237 struct config_group ns_group;
238};
239
240struct dlm_node {
241 struct config_item item;
242 struct list_head list; /* space->members */
243 int nodeid;
244 int weight;
245 int new;
246 int comm_seq; /* copy of cm->seq when nd->nodeid is set */
247};
248
249static struct configfs_group_operations clusters_ops = {
250 .make_group = make_cluster,
251 .drop_item = drop_cluster,
252};
253
254static struct configfs_item_operations cluster_ops = {
255 .release = release_cluster,
256};
257
258static struct configfs_group_operations spaces_ops = {
259 .make_group = make_space,
260 .drop_item = drop_space,
261};
262
263static struct configfs_item_operations space_ops = {
264 .release = release_space,
265};
266
267static struct configfs_group_operations comms_ops = {
268 .make_item = make_comm,
269 .drop_item = drop_comm,
270};
271
272static struct configfs_item_operations comm_ops = {
273 .release = release_comm,
274};
275
276static struct configfs_group_operations nodes_ops = {
277 .make_item = make_node,
278 .drop_item = drop_node,
279};
280
281static struct configfs_item_operations node_ops = {
282 .release = release_node,
283};
284
285static struct config_item_type clusters_type = {
286 .ct_group_ops = &clusters_ops,
287 .ct_owner = THIS_MODULE,
288};
289
290static struct config_item_type cluster_type = {
291 .ct_item_ops = &cluster_ops,
292 .ct_attrs = cluster_attrs,
293 .ct_owner = THIS_MODULE,
294};
295
296static struct config_item_type spaces_type = {
297 .ct_group_ops = &spaces_ops,
298 .ct_owner = THIS_MODULE,
299};
300
301static struct config_item_type space_type = {
302 .ct_item_ops = &space_ops,
303 .ct_owner = THIS_MODULE,
304};
305
306static struct config_item_type comms_type = {
307 .ct_group_ops = &comms_ops,
308 .ct_owner = THIS_MODULE,
309};
310
311static struct config_item_type comm_type = {
312 .ct_item_ops = &comm_ops,
313 .ct_attrs = comm_attrs,
314 .ct_owner = THIS_MODULE,
315};
316
317static struct config_item_type nodes_type = {
318 .ct_group_ops = &nodes_ops,
319 .ct_owner = THIS_MODULE,
320};
321
322static struct config_item_type node_type = {
323 .ct_item_ops = &node_ops,
324 .ct_attrs = node_attrs,
325 .ct_owner = THIS_MODULE,
326};
327
328static struct dlm_space *config_item_to_space(struct config_item *i)
329{
330 return i ? container_of(to_config_group(i), struct dlm_space, group) :
331 NULL;
332}
333
334static struct dlm_comm *config_item_to_comm(struct config_item *i)
335{
336 return i ? container_of(i, struct dlm_comm, item) : NULL;
337}
338
339static struct dlm_node *config_item_to_node(struct config_item *i)
340{
341 return i ? container_of(i, struct dlm_node, item) : NULL;
342}
343
344static struct config_group *make_cluster(struct config_group *g,
345 const char *name)
346{
347 struct dlm_cluster *cl = NULL;
348 struct dlm_spaces *sps = NULL;
349 struct dlm_comms *cms = NULL;
350
351 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
352 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
353 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
354
355 if (!cl || !sps || !cms)
356 goto fail;
357
358 config_group_init_type_name(&cl->group, name, &cluster_type);
359 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
360 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
361
362 configfs_add_default_group(&sps->ss_group, &cl->group);
363 configfs_add_default_group(&cms->cs_group, &cl->group);
364
365 cl->cl_tcp_port = dlm_config.ci_tcp_port;
366 cl->cl_buffer_size = dlm_config.ci_buffer_size;
367 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
368 cl->cl_recover_timer = dlm_config.ci_recover_timer;
369 cl->cl_toss_secs = dlm_config.ci_toss_secs;
370 cl->cl_scan_secs = dlm_config.ci_scan_secs;
371 cl->cl_log_debug = dlm_config.ci_log_debug;
372 cl->cl_log_info = dlm_config.ci_log_info;
373 cl->cl_protocol = dlm_config.ci_protocol;
374 cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
375 cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
376 cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
377 cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
378 memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
379 DLM_LOCKSPACE_LEN);
380
381 space_list = &sps->ss_group;
382 comm_list = &cms->cs_group;
383 return &cl->group;
384
385 fail:
386 kfree(cl);
387 kfree(sps);
388 kfree(cms);
389 return ERR_PTR(-ENOMEM);
390}
391
392static void drop_cluster(struct config_group *g, struct config_item *i)
393{
394 struct dlm_cluster *cl = config_item_to_cluster(i);
395
396 configfs_remove_default_groups(&cl->group);
397
398 space_list = NULL;
399 comm_list = NULL;
400
401 config_item_put(i);
402}
403
404static void release_cluster(struct config_item *i)
405{
406 struct dlm_cluster *cl = config_item_to_cluster(i);
407 kfree(cl);
408}
409
410static struct config_group *make_space(struct config_group *g, const char *name)
411{
412 struct dlm_space *sp = NULL;
413 struct dlm_nodes *nds = NULL;
414
415 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
416 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
417
418 if (!sp || !nds)
419 goto fail;
420
421 config_group_init_type_name(&sp->group, name, &space_type);
422
423 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
424 configfs_add_default_group(&nds->ns_group, &sp->group);
425
426 INIT_LIST_HEAD(&sp->members);
427 mutex_init(&sp->members_lock);
428 sp->members_count = 0;
429 return &sp->group;
430
431 fail:
432 kfree(sp);
433 kfree(nds);
434 return ERR_PTR(-ENOMEM);
435}
436
437static void drop_space(struct config_group *g, struct config_item *i)
438{
439 struct dlm_space *sp = config_item_to_space(i);
440
441 /* assert list_empty(&sp->members) */
442
443 configfs_remove_default_groups(&sp->group);
444 config_item_put(i);
445}
446
447static void release_space(struct config_item *i)
448{
449 struct dlm_space *sp = config_item_to_space(i);
450 kfree(sp);
451}
452
453static struct config_item *make_comm(struct config_group *g, const char *name)
454{
455 struct dlm_comm *cm;
456
457 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
458 if (!cm)
459 return ERR_PTR(-ENOMEM);
460
461 config_item_init_type_name(&cm->item, name, &comm_type);
462
463 cm->seq = dlm_comm_count++;
464 if (!cm->seq)
465 cm->seq = dlm_comm_count++;
466
467 cm->nodeid = -1;
468 cm->local = 0;
469 cm->addr_count = 0;
470 return &cm->item;
471}
472
473static void drop_comm(struct config_group *g, struct config_item *i)
474{
475 struct dlm_comm *cm = config_item_to_comm(i);
476 if (local_comm == cm)
477 local_comm = NULL;
478 dlm_lowcomms_close(cm->nodeid);
479 while (cm->addr_count--)
480 kfree(cm->addr[cm->addr_count]);
481 config_item_put(i);
482}
483
484static void release_comm(struct config_item *i)
485{
486 struct dlm_comm *cm = config_item_to_comm(i);
487 kfree(cm);
488}
489
490static struct config_item *make_node(struct config_group *g, const char *name)
491{
492 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
493 struct dlm_node *nd;
494
495 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
496 if (!nd)
497 return ERR_PTR(-ENOMEM);
498
499 config_item_init_type_name(&nd->item, name, &node_type);
500 nd->nodeid = -1;
501 nd->weight = 1; /* default weight of 1 if none is set */
502 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
503
504 mutex_lock(&sp->members_lock);
505 list_add(&nd->list, &sp->members);
506 sp->members_count++;
507 mutex_unlock(&sp->members_lock);
508
509 return &nd->item;
510}
511
512static void drop_node(struct config_group *g, struct config_item *i)
513{
514 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
515 struct dlm_node *nd = config_item_to_node(i);
516
517 mutex_lock(&sp->members_lock);
518 list_del(&nd->list);
519 sp->members_count--;
520 mutex_unlock(&sp->members_lock);
521
522 config_item_put(i);
523}
524
525static void release_node(struct config_item *i)
526{
527 struct dlm_node *nd = config_item_to_node(i);
528 kfree(nd);
529}
530
531static struct dlm_clusters clusters_root = {
532 .subsys = {
533 .su_group = {
534 .cg_item = {
535 .ci_namebuf = "dlm",
536 .ci_type = &clusters_type,
537 },
538 },
539 },
540};
541
542int __init dlm_config_init(void)
543{
544 config_group_init(&clusters_root.subsys.su_group);
545 mutex_init(&clusters_root.subsys.su_mutex);
546 return configfs_register_subsystem(&clusters_root.subsys);
547}
548
549void dlm_config_exit(void)
550{
551 configfs_unregister_subsystem(&clusters_root.subsys);
552}
553
554/*
555 * Functions for user space to read/write attributes
556 */
557
558static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
559{
560 return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
561}
562
563static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
564 size_t len)
565{
566 int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
567
568 if (rc)
569 return rc;
570 return len;
571}
572
573static ssize_t comm_local_show(struct config_item *item, char *buf)
574{
575 return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
576}
577
578static ssize_t comm_local_store(struct config_item *item, const char *buf,
579 size_t len)
580{
581 struct dlm_comm *cm = config_item_to_comm(item);
582 int rc = kstrtoint(buf, 0, &cm->local);
583
584 if (rc)
585 return rc;
586 if (cm->local && !local_comm)
587 local_comm = cm;
588 return len;
589}
590
591static ssize_t comm_addr_store(struct config_item *item, const char *buf,
592 size_t len)
593{
594 struct dlm_comm *cm = config_item_to_comm(item);
595 struct sockaddr_storage *addr;
596 int rv;
597
598 if (len != sizeof(struct sockaddr_storage))
599 return -EINVAL;
600
601 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
602 return -ENOSPC;
603
604 addr = kzalloc(sizeof(*addr), GFP_NOFS);
605 if (!addr)
606 return -ENOMEM;
607
608 memcpy(addr, buf, len);
609
610 rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
611 if (rv) {
612 kfree(addr);
613 return rv;
614 }
615
616 cm->addr[cm->addr_count++] = addr;
617 return len;
618}
619
620static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
621{
622 struct dlm_comm *cm = config_item_to_comm(item);
623 ssize_t s;
624 ssize_t allowance;
625 int i;
626 struct sockaddr_storage *addr;
627 struct sockaddr_in *addr_in;
628 struct sockaddr_in6 *addr_in6;
629
630 /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
631 char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
632
633
634 /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
635 allowance = 4096;
636 buf[0] = '\0';
637
638 for (i = 0; i < cm->addr_count; i++) {
639 addr = cm->addr[i];
640
641 switch(addr->ss_family) {
642 case AF_INET:
643 addr_in = (struct sockaddr_in *)addr;
644 s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr);
645 break;
646 case AF_INET6:
647 addr_in6 = (struct sockaddr_in6 *)addr;
648 s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr);
649 break;
650 default:
651 s = sprintf(buf0, "%s\n", "<UNKNOWN>");
652 break;
653 }
654 allowance -= s;
655 if (allowance >= 0)
656 strcat(buf, buf0);
657 else {
658 allowance += s;
659 break;
660 }
661 }
662 return 4096 - allowance;
663}
664
665CONFIGFS_ATTR(comm_, nodeid);
666CONFIGFS_ATTR(comm_, local);
667CONFIGFS_ATTR_WO(comm_, addr);
668CONFIGFS_ATTR_RO(comm_, addr_list);
669
670static struct configfs_attribute *comm_attrs[] = {
671 [COMM_ATTR_NODEID] = &comm_attr_nodeid,
672 [COMM_ATTR_LOCAL] = &comm_attr_local,
673 [COMM_ATTR_ADDR] = &comm_attr_addr,
674 [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
675 NULL,
676};
677
678static ssize_t node_nodeid_show(struct config_item *item, char *buf)
679{
680 return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
681}
682
683static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
684 size_t len)
685{
686 struct dlm_node *nd = config_item_to_node(item);
687 uint32_t seq = 0;
688 int rc = kstrtoint(buf, 0, &nd->nodeid);
689
690 if (rc)
691 return rc;
692 dlm_comm_seq(nd->nodeid, &seq);
693 nd->comm_seq = seq;
694 return len;
695}
696
697static ssize_t node_weight_show(struct config_item *item, char *buf)
698{
699 return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
700}
701
702static ssize_t node_weight_store(struct config_item *item, const char *buf,
703 size_t len)
704{
705 int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
706
707 if (rc)
708 return rc;
709 return len;
710}
711
712CONFIGFS_ATTR(node_, nodeid);
713CONFIGFS_ATTR(node_, weight);
714
715static struct configfs_attribute *node_attrs[] = {
716 [NODE_ATTR_NODEID] = &node_attr_nodeid,
717 [NODE_ATTR_WEIGHT] = &node_attr_weight,
718 NULL,
719};
720
721/*
722 * Functions for the dlm to get the info that's been configured
723 */
724
725static struct dlm_space *get_space(char *name)
726{
727 struct config_item *i;
728
729 if (!space_list)
730 return NULL;
731
732 mutex_lock(&space_list->cg_subsys->su_mutex);
733 i = config_group_find_item(space_list, name);
734 mutex_unlock(&space_list->cg_subsys->su_mutex);
735
736 return config_item_to_space(i);
737}
738
739static void put_space(struct dlm_space *sp)
740{
741 config_item_put(&sp->group.cg_item);
742}
743
744static struct dlm_comm *get_comm(int nodeid)
745{
746 struct config_item *i;
747 struct dlm_comm *cm = NULL;
748 int found = 0;
749
750 if (!comm_list)
751 return NULL;
752
753 mutex_lock(&clusters_root.subsys.su_mutex);
754
755 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
756 cm = config_item_to_comm(i);
757
758 if (cm->nodeid != nodeid)
759 continue;
760 found = 1;
761 config_item_get(i);
762 break;
763 }
764 mutex_unlock(&clusters_root.subsys.su_mutex);
765
766 if (!found)
767 cm = NULL;
768 return cm;
769}
770
771static void put_comm(struct dlm_comm *cm)
772{
773 config_item_put(&cm->item);
774}
775
776/* caller must free mem */
777int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
778 int *count_out)
779{
780 struct dlm_space *sp;
781 struct dlm_node *nd;
782 struct dlm_config_node *nodes, *node;
783 int rv, count;
784
785 sp = get_space(lsname);
786 if (!sp)
787 return -EEXIST;
788
789 mutex_lock(&sp->members_lock);
790 if (!sp->members_count) {
791 rv = -EINVAL;
792 printk(KERN_ERR "dlm: zero members_count\n");
793 goto out;
794 }
795
796 count = sp->members_count;
797
798 nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
799 if (!nodes) {
800 rv = -ENOMEM;
801 goto out;
802 }
803
804 node = nodes;
805 list_for_each_entry(nd, &sp->members, list) {
806 node->nodeid = nd->nodeid;
807 node->weight = nd->weight;
808 node->new = nd->new;
809 node->comm_seq = nd->comm_seq;
810 node++;
811
812 nd->new = 0;
813 }
814
815 *count_out = count;
816 *nodes_out = nodes;
817 rv = 0;
818 out:
819 mutex_unlock(&sp->members_lock);
820 put_space(sp);
821 return rv;
822}
823
824int dlm_comm_seq(int nodeid, uint32_t *seq)
825{
826 struct dlm_comm *cm = get_comm(nodeid);
827 if (!cm)
828 return -EEXIST;
829 *seq = cm->seq;
830 put_comm(cm);
831 return 0;
832}
833
834int dlm_our_nodeid(void)
835{
836 return local_comm ? local_comm->nodeid : 0;
837}
838
839/* num 0 is first addr, num 1 is second addr */
840int dlm_our_addr(struct sockaddr_storage *addr, int num)
841{
842 if (!local_comm)
843 return -1;
844 if (num + 1 > local_comm->addr_count)
845 return -1;
846 memcpy(addr, local_comm->addr[num], sizeof(*addr));
847 return 0;
848}
849
850/* Config file defaults */
851#define DEFAULT_TCP_PORT 21064
852#define DEFAULT_BUFFER_SIZE 4096
853#define DEFAULT_RSBTBL_SIZE 1024
854#define DEFAULT_RECOVER_TIMER 5
855#define DEFAULT_TOSS_SECS 10
856#define DEFAULT_SCAN_SECS 5
857#define DEFAULT_LOG_DEBUG 0
858#define DEFAULT_LOG_INFO 1
859#define DEFAULT_PROTOCOL 0
860#define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */
861#define DEFAULT_WAITWARN_US 0
862#define DEFAULT_NEW_RSB_COUNT 128
863#define DEFAULT_RECOVER_CALLBACKS 0
864#define DEFAULT_CLUSTER_NAME ""
865
866struct dlm_config_info dlm_config = {
867 .ci_tcp_port = DEFAULT_TCP_PORT,
868 .ci_buffer_size = DEFAULT_BUFFER_SIZE,
869 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
870 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
871 .ci_toss_secs = DEFAULT_TOSS_SECS,
872 .ci_scan_secs = DEFAULT_SCAN_SECS,
873 .ci_log_debug = DEFAULT_LOG_DEBUG,
874 .ci_log_info = DEFAULT_LOG_INFO,
875 .ci_protocol = DEFAULT_PROTOCOL,
876 .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
877 .ci_waitwarn_us = DEFAULT_WAITWARN_US,
878 .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
879 .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
880 .ci_cluster_name = DEFAULT_CLUSTER_NAME
881};
882