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1// SPDX-License-Identifier: GPL-2.0-only
2/******************************************************************************
3*******************************************************************************
4**
5** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
6** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
7**
8**
9*******************************************************************************
10******************************************************************************/
11
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/configfs.h>
15#include <linux/slab.h>
16#include <linux/in.h>
17#include <linux/in6.h>
18#include <linux/dlmconstants.h>
19#include <net/ipv6.h>
20#include <net/sock.h>
21
22#include "config.h"
23#include "midcomms.h"
24#include "lowcomms.h"
25
26/*
27 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
28 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
29 * /config/dlm/<cluster>/comms/<comm>/nodeid
30 * /config/dlm/<cluster>/comms/<comm>/local
31 * /config/dlm/<cluster>/comms/<comm>/addr (write only)
32 * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
33 * The <cluster> level is useless, but I haven't figured out how to avoid it.
34 */
35
36static struct config_group *space_list;
37static struct config_group *comm_list;
38static struct dlm_comm *local_comm;
39static uint32_t dlm_comm_count;
40
41struct dlm_clusters;
42struct dlm_cluster;
43struct dlm_spaces;
44struct dlm_space;
45struct dlm_comms;
46struct dlm_comm;
47struct dlm_nodes;
48struct dlm_node;
49
50static struct config_group *make_cluster(struct config_group *, const char *);
51static void drop_cluster(struct config_group *, struct config_item *);
52static void release_cluster(struct config_item *);
53static struct config_group *make_space(struct config_group *, const char *);
54static void drop_space(struct config_group *, struct config_item *);
55static void release_space(struct config_item *);
56static struct config_item *make_comm(struct config_group *, const char *);
57static void drop_comm(struct config_group *, struct config_item *);
58static void release_comm(struct config_item *);
59static struct config_item *make_node(struct config_group *, const char *);
60static void drop_node(struct config_group *, struct config_item *);
61static void release_node(struct config_item *);
62
63static struct configfs_attribute *comm_attrs[];
64static struct configfs_attribute *node_attrs[];
65
66struct dlm_cluster {
67 struct config_group group;
68 unsigned int cl_tcp_port;
69 unsigned int cl_buffer_size;
70 unsigned int cl_rsbtbl_size;
71 unsigned int cl_recover_timer;
72 unsigned int cl_toss_secs;
73 unsigned int cl_scan_secs;
74 unsigned int cl_log_debug;
75 unsigned int cl_log_info;
76 unsigned int cl_protocol;
77 unsigned int cl_mark;
78 unsigned int cl_new_rsb_count;
79 unsigned int cl_recover_callbacks;
80 char cl_cluster_name[DLM_LOCKSPACE_LEN];
81
82 struct dlm_spaces *sps;
83 struct dlm_comms *cms;
84};
85
86static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
87{
88 return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
89 NULL;
90}
91
92enum {
93 CLUSTER_ATTR_TCP_PORT = 0,
94 CLUSTER_ATTR_BUFFER_SIZE,
95 CLUSTER_ATTR_RSBTBL_SIZE,
96 CLUSTER_ATTR_RECOVER_TIMER,
97 CLUSTER_ATTR_TOSS_SECS,
98 CLUSTER_ATTR_SCAN_SECS,
99 CLUSTER_ATTR_LOG_DEBUG,
100 CLUSTER_ATTR_LOG_INFO,
101 CLUSTER_ATTR_PROTOCOL,
102 CLUSTER_ATTR_MARK,
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 strscpy(dlm_config.ci_cluster_name, buf,
120 sizeof(dlm_config.ci_cluster_name));
121 strscpy(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_cb)(unsigned int x),
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_cb) {
141 rc = check_cb(x);
142 if (rc)
143 return rc;
144 }
145
146 *cl_field = x;
147 *info_field = x;
148
149 return len;
150}
151
152#define CLUSTER_ATTR(name, check_cb) \
153static ssize_t cluster_##name##_store(struct config_item *item, \
154 const char *buf, size_t len) \
155{ \
156 struct dlm_cluster *cl = config_item_to_cluster(item); \
157 return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \
158 check_cb, buf, len); \
159} \
160static ssize_t cluster_##name##_show(struct config_item *item, char *buf) \
161{ \
162 struct dlm_cluster *cl = config_item_to_cluster(item); \
163 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
164} \
165CONFIGFS_ATTR(cluster_, name);
166
167static int dlm_check_protocol_and_dlm_running(unsigned int x)
168{
169 switch (x) {
170 case 0:
171 /* TCP */
172 break;
173 case 1:
174 /* SCTP */
175 break;
176 default:
177 return -EINVAL;
178 }
179
180 if (dlm_lowcomms_is_running())
181 return -EBUSY;
182
183 return 0;
184}
185
186static int dlm_check_zero_and_dlm_running(unsigned int x)
187{
188 if (!x)
189 return -EINVAL;
190
191 if (dlm_lowcomms_is_running())
192 return -EBUSY;
193
194 return 0;
195}
196
197static int dlm_check_zero(unsigned int x)
198{
199 if (!x)
200 return -EINVAL;
201
202 return 0;
203}
204
205static int dlm_check_buffer_size(unsigned int x)
206{
207 if (x < DLM_MAX_SOCKET_BUFSIZE)
208 return -EINVAL;
209
210 return 0;
211}
212
213CLUSTER_ATTR(tcp_port, dlm_check_zero_and_dlm_running);
214CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
215CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
216CLUSTER_ATTR(recover_timer, dlm_check_zero);
217CLUSTER_ATTR(toss_secs, dlm_check_zero);
218CLUSTER_ATTR(scan_secs, dlm_check_zero);
219CLUSTER_ATTR(log_debug, NULL);
220CLUSTER_ATTR(log_info, NULL);
221CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
222CLUSTER_ATTR(mark, NULL);
223CLUSTER_ATTR(new_rsb_count, NULL);
224CLUSTER_ATTR(recover_callbacks, NULL);
225
226static struct configfs_attribute *cluster_attrs[] = {
227 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
228 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
229 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
230 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
231 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
232 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
233 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
234 [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
235 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
236 [CLUSTER_ATTR_MARK] = &cluster_attr_mark,
237 [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
238 [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
239 [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
240 NULL,
241};
242
243enum {
244 COMM_ATTR_NODEID = 0,
245 COMM_ATTR_LOCAL,
246 COMM_ATTR_ADDR,
247 COMM_ATTR_ADDR_LIST,
248 COMM_ATTR_MARK,
249};
250
251enum {
252 NODE_ATTR_NODEID = 0,
253 NODE_ATTR_WEIGHT,
254};
255
256struct dlm_clusters {
257 struct configfs_subsystem subsys;
258};
259
260struct dlm_spaces {
261 struct config_group ss_group;
262};
263
264struct dlm_space {
265 struct config_group group;
266 struct list_head members;
267 struct mutex members_lock;
268 int members_count;
269 struct dlm_nodes *nds;
270};
271
272struct dlm_comms {
273 struct config_group cs_group;
274};
275
276struct dlm_comm {
277 struct config_item item;
278 int seq;
279 int nodeid;
280 int local;
281 int addr_count;
282 unsigned int mark;
283 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
284};
285
286struct dlm_nodes {
287 struct config_group ns_group;
288};
289
290struct dlm_node {
291 struct config_item item;
292 struct list_head list; /* space->members */
293 int nodeid;
294 int weight;
295 int new;
296 int comm_seq; /* copy of cm->seq when nd->nodeid is set */
297};
298
299static struct configfs_group_operations clusters_ops = {
300 .make_group = make_cluster,
301 .drop_item = drop_cluster,
302};
303
304static struct configfs_item_operations cluster_ops = {
305 .release = release_cluster,
306};
307
308static struct configfs_group_operations spaces_ops = {
309 .make_group = make_space,
310 .drop_item = drop_space,
311};
312
313static struct configfs_item_operations space_ops = {
314 .release = release_space,
315};
316
317static struct configfs_group_operations comms_ops = {
318 .make_item = make_comm,
319 .drop_item = drop_comm,
320};
321
322static struct configfs_item_operations comm_ops = {
323 .release = release_comm,
324};
325
326static struct configfs_group_operations nodes_ops = {
327 .make_item = make_node,
328 .drop_item = drop_node,
329};
330
331static struct configfs_item_operations node_ops = {
332 .release = release_node,
333};
334
335static const struct config_item_type clusters_type = {
336 .ct_group_ops = &clusters_ops,
337 .ct_owner = THIS_MODULE,
338};
339
340static const struct config_item_type cluster_type = {
341 .ct_item_ops = &cluster_ops,
342 .ct_attrs = cluster_attrs,
343 .ct_owner = THIS_MODULE,
344};
345
346static const struct config_item_type spaces_type = {
347 .ct_group_ops = &spaces_ops,
348 .ct_owner = THIS_MODULE,
349};
350
351static const struct config_item_type space_type = {
352 .ct_item_ops = &space_ops,
353 .ct_owner = THIS_MODULE,
354};
355
356static const struct config_item_type comms_type = {
357 .ct_group_ops = &comms_ops,
358 .ct_owner = THIS_MODULE,
359};
360
361static const struct config_item_type comm_type = {
362 .ct_item_ops = &comm_ops,
363 .ct_attrs = comm_attrs,
364 .ct_owner = THIS_MODULE,
365};
366
367static const struct config_item_type nodes_type = {
368 .ct_group_ops = &nodes_ops,
369 .ct_owner = THIS_MODULE,
370};
371
372static const struct config_item_type node_type = {
373 .ct_item_ops = &node_ops,
374 .ct_attrs = node_attrs,
375 .ct_owner = THIS_MODULE,
376};
377
378static struct dlm_space *config_item_to_space(struct config_item *i)
379{
380 return i ? container_of(to_config_group(i), struct dlm_space, group) :
381 NULL;
382}
383
384static struct dlm_comm *config_item_to_comm(struct config_item *i)
385{
386 return i ? container_of(i, struct dlm_comm, item) : NULL;
387}
388
389static struct dlm_node *config_item_to_node(struct config_item *i)
390{
391 return i ? container_of(i, struct dlm_node, item) : NULL;
392}
393
394static struct config_group *make_cluster(struct config_group *g,
395 const char *name)
396{
397 struct dlm_cluster *cl = NULL;
398 struct dlm_spaces *sps = NULL;
399 struct dlm_comms *cms = NULL;
400
401 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
402 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
403 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
404
405 if (!cl || !sps || !cms)
406 goto fail;
407
408 cl->sps = sps;
409 cl->cms = cms;
410
411 config_group_init_type_name(&cl->group, name, &cluster_type);
412 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
413 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
414
415 configfs_add_default_group(&sps->ss_group, &cl->group);
416 configfs_add_default_group(&cms->cs_group, &cl->group);
417
418 cl->cl_tcp_port = dlm_config.ci_tcp_port;
419 cl->cl_buffer_size = dlm_config.ci_buffer_size;
420 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
421 cl->cl_recover_timer = dlm_config.ci_recover_timer;
422 cl->cl_toss_secs = dlm_config.ci_toss_secs;
423 cl->cl_scan_secs = dlm_config.ci_scan_secs;
424 cl->cl_log_debug = dlm_config.ci_log_debug;
425 cl->cl_log_info = dlm_config.ci_log_info;
426 cl->cl_protocol = dlm_config.ci_protocol;
427 cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
428 cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
429 memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
430 DLM_LOCKSPACE_LEN);
431
432 space_list = &sps->ss_group;
433 comm_list = &cms->cs_group;
434 return &cl->group;
435
436 fail:
437 kfree(cl);
438 kfree(sps);
439 kfree(cms);
440 return ERR_PTR(-ENOMEM);
441}
442
443static void drop_cluster(struct config_group *g, struct config_item *i)
444{
445 struct dlm_cluster *cl = config_item_to_cluster(i);
446
447 configfs_remove_default_groups(&cl->group);
448
449 space_list = NULL;
450 comm_list = NULL;
451
452 config_item_put(i);
453}
454
455static void release_cluster(struct config_item *i)
456{
457 struct dlm_cluster *cl = config_item_to_cluster(i);
458
459 kfree(cl->sps);
460 kfree(cl->cms);
461 kfree(cl);
462}
463
464static struct config_group *make_space(struct config_group *g, const char *name)
465{
466 struct dlm_space *sp = NULL;
467 struct dlm_nodes *nds = NULL;
468
469 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
470 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
471
472 if (!sp || !nds)
473 goto fail;
474
475 config_group_init_type_name(&sp->group, name, &space_type);
476
477 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
478 configfs_add_default_group(&nds->ns_group, &sp->group);
479
480 INIT_LIST_HEAD(&sp->members);
481 mutex_init(&sp->members_lock);
482 sp->members_count = 0;
483 sp->nds = nds;
484 return &sp->group;
485
486 fail:
487 kfree(sp);
488 kfree(nds);
489 return ERR_PTR(-ENOMEM);
490}
491
492static void drop_space(struct config_group *g, struct config_item *i)
493{
494 struct dlm_space *sp = config_item_to_space(i);
495
496 /* assert list_empty(&sp->members) */
497
498 configfs_remove_default_groups(&sp->group);
499 config_item_put(i);
500}
501
502static void release_space(struct config_item *i)
503{
504 struct dlm_space *sp = config_item_to_space(i);
505 kfree(sp->nds);
506 kfree(sp);
507}
508
509static struct config_item *make_comm(struct config_group *g, const char *name)
510{
511 struct dlm_comm *cm;
512
513 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
514 if (!cm)
515 return ERR_PTR(-ENOMEM);
516
517 config_item_init_type_name(&cm->item, name, &comm_type);
518
519 cm->seq = dlm_comm_count++;
520 if (!cm->seq)
521 cm->seq = dlm_comm_count++;
522
523 cm->nodeid = -1;
524 cm->local = 0;
525 cm->addr_count = 0;
526 cm->mark = 0;
527 return &cm->item;
528}
529
530static void drop_comm(struct config_group *g, struct config_item *i)
531{
532 struct dlm_comm *cm = config_item_to_comm(i);
533 if (local_comm == cm)
534 local_comm = NULL;
535 dlm_midcomms_close(cm->nodeid);
536 while (cm->addr_count--)
537 kfree(cm->addr[cm->addr_count]);
538 config_item_put(i);
539}
540
541static void release_comm(struct config_item *i)
542{
543 struct dlm_comm *cm = config_item_to_comm(i);
544 kfree(cm);
545}
546
547static struct config_item *make_node(struct config_group *g, const char *name)
548{
549 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
550 struct dlm_node *nd;
551
552 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
553 if (!nd)
554 return ERR_PTR(-ENOMEM);
555
556 config_item_init_type_name(&nd->item, name, &node_type);
557 nd->nodeid = -1;
558 nd->weight = 1; /* default weight of 1 if none is set */
559 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
560
561 mutex_lock(&sp->members_lock);
562 list_add(&nd->list, &sp->members);
563 sp->members_count++;
564 mutex_unlock(&sp->members_lock);
565
566 return &nd->item;
567}
568
569static void drop_node(struct config_group *g, struct config_item *i)
570{
571 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
572 struct dlm_node *nd = config_item_to_node(i);
573
574 mutex_lock(&sp->members_lock);
575 list_del(&nd->list);
576 sp->members_count--;
577 mutex_unlock(&sp->members_lock);
578
579 config_item_put(i);
580}
581
582static void release_node(struct config_item *i)
583{
584 struct dlm_node *nd = config_item_to_node(i);
585 kfree(nd);
586}
587
588static struct dlm_clusters clusters_root = {
589 .subsys = {
590 .su_group = {
591 .cg_item = {
592 .ci_namebuf = "dlm",
593 .ci_type = &clusters_type,
594 },
595 },
596 },
597};
598
599int __init dlm_config_init(void)
600{
601 config_group_init(&clusters_root.subsys.su_group);
602 mutex_init(&clusters_root.subsys.su_mutex);
603 return configfs_register_subsystem(&clusters_root.subsys);
604}
605
606void dlm_config_exit(void)
607{
608 configfs_unregister_subsystem(&clusters_root.subsys);
609}
610
611/*
612 * Functions for user space to read/write attributes
613 */
614
615static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
616{
617 return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
618}
619
620static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
621 size_t len)
622{
623 int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
624
625 if (rc)
626 return rc;
627 return len;
628}
629
630static ssize_t comm_local_show(struct config_item *item, char *buf)
631{
632 return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
633}
634
635static ssize_t comm_local_store(struct config_item *item, const char *buf,
636 size_t len)
637{
638 struct dlm_comm *cm = config_item_to_comm(item);
639 int rc = kstrtoint(buf, 0, &cm->local);
640
641 if (rc)
642 return rc;
643 if (cm->local && !local_comm)
644 local_comm = cm;
645 return len;
646}
647
648static ssize_t comm_addr_store(struct config_item *item, const char *buf,
649 size_t len)
650{
651 struct dlm_comm *cm = config_item_to_comm(item);
652 struct sockaddr_storage *addr;
653 int rv;
654
655 if (len != sizeof(struct sockaddr_storage))
656 return -EINVAL;
657
658 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
659 return -ENOSPC;
660
661 addr = kzalloc(sizeof(*addr), GFP_NOFS);
662 if (!addr)
663 return -ENOMEM;
664
665 memcpy(addr, buf, len);
666
667 rv = dlm_midcomms_addr(cm->nodeid, addr, len);
668 if (rv) {
669 kfree(addr);
670 return rv;
671 }
672
673 cm->addr[cm->addr_count++] = addr;
674 return len;
675}
676
677static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
678{
679 struct dlm_comm *cm = config_item_to_comm(item);
680 ssize_t s;
681 ssize_t allowance;
682 int i;
683 struct sockaddr_storage *addr;
684 struct sockaddr_in *addr_in;
685 struct sockaddr_in6 *addr_in6;
686
687 /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
688 char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
689
690
691 /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
692 allowance = 4096;
693 buf[0] = '\0';
694
695 for (i = 0; i < cm->addr_count; i++) {
696 addr = cm->addr[i];
697
698 switch(addr->ss_family) {
699 case AF_INET:
700 addr_in = (struct sockaddr_in *)addr;
701 s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr);
702 break;
703 case AF_INET6:
704 addr_in6 = (struct sockaddr_in6 *)addr;
705 s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr);
706 break;
707 default:
708 s = sprintf(buf0, "%s\n", "<UNKNOWN>");
709 break;
710 }
711 allowance -= s;
712 if (allowance >= 0)
713 strcat(buf, buf0);
714 else {
715 allowance += s;
716 break;
717 }
718 }
719 return 4096 - allowance;
720}
721
722static ssize_t comm_mark_show(struct config_item *item, char *buf)
723{
724 return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
725}
726
727static ssize_t comm_mark_store(struct config_item *item, const char *buf,
728 size_t len)
729{
730 struct dlm_comm *comm;
731 unsigned int mark;
732 int rc;
733
734 rc = kstrtouint(buf, 0, &mark);
735 if (rc)
736 return rc;
737
738 if (mark == 0)
739 mark = dlm_config.ci_mark;
740
741 comm = config_item_to_comm(item);
742 rc = dlm_lowcomms_nodes_set_mark(comm->nodeid, mark);
743 if (rc)
744 return rc;
745
746 comm->mark = mark;
747 return len;
748}
749
750CONFIGFS_ATTR(comm_, nodeid);
751CONFIGFS_ATTR(comm_, local);
752CONFIGFS_ATTR(comm_, mark);
753CONFIGFS_ATTR_WO(comm_, addr);
754CONFIGFS_ATTR_RO(comm_, addr_list);
755
756static struct configfs_attribute *comm_attrs[] = {
757 [COMM_ATTR_NODEID] = &comm_attr_nodeid,
758 [COMM_ATTR_LOCAL] = &comm_attr_local,
759 [COMM_ATTR_ADDR] = &comm_attr_addr,
760 [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
761 [COMM_ATTR_MARK] = &comm_attr_mark,
762 NULL,
763};
764
765static ssize_t node_nodeid_show(struct config_item *item, char *buf)
766{
767 return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
768}
769
770static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
771 size_t len)
772{
773 struct dlm_node *nd = config_item_to_node(item);
774 uint32_t seq = 0;
775 int rc = kstrtoint(buf, 0, &nd->nodeid);
776
777 if (rc)
778 return rc;
779 dlm_comm_seq(nd->nodeid, &seq);
780 nd->comm_seq = seq;
781 return len;
782}
783
784static ssize_t node_weight_show(struct config_item *item, char *buf)
785{
786 return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
787}
788
789static ssize_t node_weight_store(struct config_item *item, const char *buf,
790 size_t len)
791{
792 int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
793
794 if (rc)
795 return rc;
796 return len;
797}
798
799CONFIGFS_ATTR(node_, nodeid);
800CONFIGFS_ATTR(node_, weight);
801
802static struct configfs_attribute *node_attrs[] = {
803 [NODE_ATTR_NODEID] = &node_attr_nodeid,
804 [NODE_ATTR_WEIGHT] = &node_attr_weight,
805 NULL,
806};
807
808/*
809 * Functions for the dlm to get the info that's been configured
810 */
811
812static struct dlm_space *get_space(char *name)
813{
814 struct config_item *i;
815
816 if (!space_list)
817 return NULL;
818
819 mutex_lock(&space_list->cg_subsys->su_mutex);
820 i = config_group_find_item(space_list, name);
821 mutex_unlock(&space_list->cg_subsys->su_mutex);
822
823 return config_item_to_space(i);
824}
825
826static void put_space(struct dlm_space *sp)
827{
828 config_item_put(&sp->group.cg_item);
829}
830
831static struct dlm_comm *get_comm(int nodeid)
832{
833 struct config_item *i;
834 struct dlm_comm *cm = NULL;
835 int found = 0;
836
837 if (!comm_list)
838 return NULL;
839
840 mutex_lock(&clusters_root.subsys.su_mutex);
841
842 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
843 cm = config_item_to_comm(i);
844
845 if (cm->nodeid != nodeid)
846 continue;
847 found = 1;
848 config_item_get(i);
849 break;
850 }
851 mutex_unlock(&clusters_root.subsys.su_mutex);
852
853 if (!found)
854 cm = NULL;
855 return cm;
856}
857
858static void put_comm(struct dlm_comm *cm)
859{
860 config_item_put(&cm->item);
861}
862
863/* caller must free mem */
864int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
865 int *count_out)
866{
867 struct dlm_space *sp;
868 struct dlm_node *nd;
869 struct dlm_config_node *nodes, *node;
870 int rv, count;
871
872 sp = get_space(lsname);
873 if (!sp)
874 return -EEXIST;
875
876 mutex_lock(&sp->members_lock);
877 if (!sp->members_count) {
878 rv = -EINVAL;
879 printk(KERN_ERR "dlm: zero members_count\n");
880 goto out;
881 }
882
883 count = sp->members_count;
884
885 nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
886 if (!nodes) {
887 rv = -ENOMEM;
888 goto out;
889 }
890
891 node = nodes;
892 list_for_each_entry(nd, &sp->members, list) {
893 node->nodeid = nd->nodeid;
894 node->weight = nd->weight;
895 node->new = nd->new;
896 node->comm_seq = nd->comm_seq;
897 node++;
898
899 nd->new = 0;
900 }
901
902 *count_out = count;
903 *nodes_out = nodes;
904 rv = 0;
905 out:
906 mutex_unlock(&sp->members_lock);
907 put_space(sp);
908 return rv;
909}
910
911int dlm_comm_seq(int nodeid, uint32_t *seq)
912{
913 struct dlm_comm *cm = get_comm(nodeid);
914 if (!cm)
915 return -EEXIST;
916 *seq = cm->seq;
917 put_comm(cm);
918 return 0;
919}
920
921int dlm_our_nodeid(void)
922{
923 return local_comm ? local_comm->nodeid : 0;
924}
925
926/* num 0 is first addr, num 1 is second addr */
927int dlm_our_addr(struct sockaddr_storage *addr, int num)
928{
929 if (!local_comm)
930 return -1;
931 if (num + 1 > local_comm->addr_count)
932 return -1;
933 memcpy(addr, local_comm->addr[num], sizeof(*addr));
934 return 0;
935}
936
937/* Config file defaults */
938#define DEFAULT_TCP_PORT 21064
939#define DEFAULT_RSBTBL_SIZE 1024
940#define DEFAULT_RECOVER_TIMER 5
941#define DEFAULT_TOSS_SECS 10
942#define DEFAULT_SCAN_SECS 5
943#define DEFAULT_LOG_DEBUG 0
944#define DEFAULT_LOG_INFO 1
945#define DEFAULT_PROTOCOL DLM_PROTO_TCP
946#define DEFAULT_MARK 0
947#define DEFAULT_NEW_RSB_COUNT 128
948#define DEFAULT_RECOVER_CALLBACKS 0
949#define DEFAULT_CLUSTER_NAME ""
950
951struct dlm_config_info dlm_config = {
952 .ci_tcp_port = DEFAULT_TCP_PORT,
953 .ci_buffer_size = DLM_MAX_SOCKET_BUFSIZE,
954 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
955 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
956 .ci_toss_secs = DEFAULT_TOSS_SECS,
957 .ci_scan_secs = DEFAULT_SCAN_SECS,
958 .ci_log_debug = DEFAULT_LOG_DEBUG,
959 .ci_log_info = DEFAULT_LOG_INFO,
960 .ci_protocol = DEFAULT_PROTOCOL,
961 .ci_mark = DEFAULT_MARK,
962 .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
963 .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
964 .ci_cluster_name = DEFAULT_CLUSTER_NAME
965};
966
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 ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
65 char *buf);
66static ssize_t store_cluster(struct config_item *i,
67 struct configfs_attribute *a,
68 const char *buf, size_t len);
69static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
70 char *buf);
71static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
72 const char *buf, size_t len);
73static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
74 char *buf);
75static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
76 const char *buf, size_t len);
77
78static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf);
79static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
80 size_t len);
81static ssize_t comm_local_read(struct dlm_comm *cm, char *buf);
82static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
83 size_t len);
84static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf,
85 size_t len);
86static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf);
87static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf);
88static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
89 size_t len);
90static ssize_t node_weight_read(struct dlm_node *nd, char *buf);
91static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
92 size_t len);
93
94struct dlm_cluster {
95 struct config_group group;
96 unsigned int cl_tcp_port;
97 unsigned int cl_buffer_size;
98 unsigned int cl_rsbtbl_size;
99 unsigned int cl_recover_timer;
100 unsigned int cl_toss_secs;
101 unsigned int cl_scan_secs;
102 unsigned int cl_log_debug;
103 unsigned int cl_protocol;
104 unsigned int cl_timewarn_cs;
105 unsigned int cl_waitwarn_us;
106 unsigned int cl_new_rsb_count;
107 unsigned int cl_recover_callbacks;
108 char cl_cluster_name[DLM_LOCKSPACE_LEN];
109};
110
111enum {
112 CLUSTER_ATTR_TCP_PORT = 0,
113 CLUSTER_ATTR_BUFFER_SIZE,
114 CLUSTER_ATTR_RSBTBL_SIZE,
115 CLUSTER_ATTR_RECOVER_TIMER,
116 CLUSTER_ATTR_TOSS_SECS,
117 CLUSTER_ATTR_SCAN_SECS,
118 CLUSTER_ATTR_LOG_DEBUG,
119 CLUSTER_ATTR_PROTOCOL,
120 CLUSTER_ATTR_TIMEWARN_CS,
121 CLUSTER_ATTR_WAITWARN_US,
122 CLUSTER_ATTR_NEW_RSB_COUNT,
123 CLUSTER_ATTR_RECOVER_CALLBACKS,
124 CLUSTER_ATTR_CLUSTER_NAME,
125};
126
127struct cluster_attribute {
128 struct configfs_attribute attr;
129 ssize_t (*show)(struct dlm_cluster *, char *);
130 ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
131};
132
133static ssize_t cluster_cluster_name_read(struct dlm_cluster *cl, char *buf)
134{
135 return sprintf(buf, "%s\n", cl->cl_cluster_name);
136}
137
138static ssize_t cluster_cluster_name_write(struct dlm_cluster *cl,
139 const char *buf, size_t len)
140{
141 strlcpy(dlm_config.ci_cluster_name, buf,
142 sizeof(dlm_config.ci_cluster_name));
143 strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
144 return len;
145}
146
147static struct cluster_attribute cluster_attr_cluster_name = {
148 .attr = { .ca_owner = THIS_MODULE,
149 .ca_name = "cluster_name",
150 .ca_mode = S_IRUGO | S_IWUSR },
151 .show = cluster_cluster_name_read,
152 .store = cluster_cluster_name_write,
153};
154
155static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
156 int *info_field, int check_zero,
157 const char *buf, size_t len)
158{
159 unsigned int x;
160
161 if (!capable(CAP_SYS_ADMIN))
162 return -EPERM;
163
164 x = simple_strtoul(buf, NULL, 0);
165
166 if (check_zero && !x)
167 return -EINVAL;
168
169 *cl_field = x;
170 *info_field = x;
171
172 return len;
173}
174
175#define CLUSTER_ATTR(name, check_zero) \
176static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
177{ \
178 return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \
179 check_zero, buf, len); \
180} \
181static ssize_t name##_read(struct dlm_cluster *cl, char *buf) \
182{ \
183 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
184} \
185static struct cluster_attribute cluster_attr_##name = \
186__CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
187
188CLUSTER_ATTR(tcp_port, 1);
189CLUSTER_ATTR(buffer_size, 1);
190CLUSTER_ATTR(rsbtbl_size, 1);
191CLUSTER_ATTR(recover_timer, 1);
192CLUSTER_ATTR(toss_secs, 1);
193CLUSTER_ATTR(scan_secs, 1);
194CLUSTER_ATTR(log_debug, 0);
195CLUSTER_ATTR(protocol, 0);
196CLUSTER_ATTR(timewarn_cs, 1);
197CLUSTER_ATTR(waitwarn_us, 0);
198CLUSTER_ATTR(new_rsb_count, 0);
199CLUSTER_ATTR(recover_callbacks, 0);
200
201static struct configfs_attribute *cluster_attrs[] = {
202 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
203 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
204 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
205 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
206 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
207 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
208 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
209 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
210 [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
211 [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr,
212 [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count.attr,
213 [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks.attr,
214 [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name.attr,
215 NULL,
216};
217
218enum {
219 COMM_ATTR_NODEID = 0,
220 COMM_ATTR_LOCAL,
221 COMM_ATTR_ADDR,
222 COMM_ATTR_ADDR_LIST,
223};
224
225struct comm_attribute {
226 struct configfs_attribute attr;
227 ssize_t (*show)(struct dlm_comm *, char *);
228 ssize_t (*store)(struct dlm_comm *, const char *, size_t);
229};
230
231static struct comm_attribute comm_attr_nodeid = {
232 .attr = { .ca_owner = THIS_MODULE,
233 .ca_name = "nodeid",
234 .ca_mode = S_IRUGO | S_IWUSR },
235 .show = comm_nodeid_read,
236 .store = comm_nodeid_write,
237};
238
239static struct comm_attribute comm_attr_local = {
240 .attr = { .ca_owner = THIS_MODULE,
241 .ca_name = "local",
242 .ca_mode = S_IRUGO | S_IWUSR },
243 .show = comm_local_read,
244 .store = comm_local_write,
245};
246
247static struct comm_attribute comm_attr_addr = {
248 .attr = { .ca_owner = THIS_MODULE,
249 .ca_name = "addr",
250 .ca_mode = S_IWUSR },
251 .store = comm_addr_write,
252};
253
254static struct comm_attribute comm_attr_addr_list = {
255 .attr = { .ca_owner = THIS_MODULE,
256 .ca_name = "addr_list",
257 .ca_mode = S_IRUGO },
258 .show = comm_addr_list_read,
259};
260
261static struct configfs_attribute *comm_attrs[] = {
262 [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
263 [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
264 [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
265 [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list.attr,
266 NULL,
267};
268
269enum {
270 NODE_ATTR_NODEID = 0,
271 NODE_ATTR_WEIGHT,
272};
273
274struct node_attribute {
275 struct configfs_attribute attr;
276 ssize_t (*show)(struct dlm_node *, char *);
277 ssize_t (*store)(struct dlm_node *, const char *, size_t);
278};
279
280static struct node_attribute node_attr_nodeid = {
281 .attr = { .ca_owner = THIS_MODULE,
282 .ca_name = "nodeid",
283 .ca_mode = S_IRUGO | S_IWUSR },
284 .show = node_nodeid_read,
285 .store = node_nodeid_write,
286};
287
288static struct node_attribute node_attr_weight = {
289 .attr = { .ca_owner = THIS_MODULE,
290 .ca_name = "weight",
291 .ca_mode = S_IRUGO | S_IWUSR },
292 .show = node_weight_read,
293 .store = node_weight_write,
294};
295
296static struct configfs_attribute *node_attrs[] = {
297 [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
298 [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
299 NULL,
300};
301
302struct dlm_clusters {
303 struct configfs_subsystem subsys;
304};
305
306struct dlm_spaces {
307 struct config_group ss_group;
308};
309
310struct dlm_space {
311 struct config_group group;
312 struct list_head members;
313 struct mutex members_lock;
314 int members_count;
315};
316
317struct dlm_comms {
318 struct config_group cs_group;
319};
320
321struct dlm_comm {
322 struct config_item item;
323 int seq;
324 int nodeid;
325 int local;
326 int addr_count;
327 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
328};
329
330struct dlm_nodes {
331 struct config_group ns_group;
332};
333
334struct dlm_node {
335 struct config_item item;
336 struct list_head list; /* space->members */
337 int nodeid;
338 int weight;
339 int new;
340 int comm_seq; /* copy of cm->seq when nd->nodeid is set */
341};
342
343static struct configfs_group_operations clusters_ops = {
344 .make_group = make_cluster,
345 .drop_item = drop_cluster,
346};
347
348static struct configfs_item_operations cluster_ops = {
349 .release = release_cluster,
350 .show_attribute = show_cluster,
351 .store_attribute = store_cluster,
352};
353
354static struct configfs_group_operations spaces_ops = {
355 .make_group = make_space,
356 .drop_item = drop_space,
357};
358
359static struct configfs_item_operations space_ops = {
360 .release = release_space,
361};
362
363static struct configfs_group_operations comms_ops = {
364 .make_item = make_comm,
365 .drop_item = drop_comm,
366};
367
368static struct configfs_item_operations comm_ops = {
369 .release = release_comm,
370 .show_attribute = show_comm,
371 .store_attribute = store_comm,
372};
373
374static struct configfs_group_operations nodes_ops = {
375 .make_item = make_node,
376 .drop_item = drop_node,
377};
378
379static struct configfs_item_operations node_ops = {
380 .release = release_node,
381 .show_attribute = show_node,
382 .store_attribute = store_node,
383};
384
385static struct config_item_type clusters_type = {
386 .ct_group_ops = &clusters_ops,
387 .ct_owner = THIS_MODULE,
388};
389
390static struct config_item_type cluster_type = {
391 .ct_item_ops = &cluster_ops,
392 .ct_attrs = cluster_attrs,
393 .ct_owner = THIS_MODULE,
394};
395
396static struct config_item_type spaces_type = {
397 .ct_group_ops = &spaces_ops,
398 .ct_owner = THIS_MODULE,
399};
400
401static struct config_item_type space_type = {
402 .ct_item_ops = &space_ops,
403 .ct_owner = THIS_MODULE,
404};
405
406static struct config_item_type comms_type = {
407 .ct_group_ops = &comms_ops,
408 .ct_owner = THIS_MODULE,
409};
410
411static struct config_item_type comm_type = {
412 .ct_item_ops = &comm_ops,
413 .ct_attrs = comm_attrs,
414 .ct_owner = THIS_MODULE,
415};
416
417static struct config_item_type nodes_type = {
418 .ct_group_ops = &nodes_ops,
419 .ct_owner = THIS_MODULE,
420};
421
422static struct config_item_type node_type = {
423 .ct_item_ops = &node_ops,
424 .ct_attrs = node_attrs,
425 .ct_owner = THIS_MODULE,
426};
427
428static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
429{
430 return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
431 NULL;
432}
433
434static struct dlm_space *config_item_to_space(struct config_item *i)
435{
436 return i ? container_of(to_config_group(i), struct dlm_space, group) :
437 NULL;
438}
439
440static struct dlm_comm *config_item_to_comm(struct config_item *i)
441{
442 return i ? container_of(i, struct dlm_comm, item) : NULL;
443}
444
445static struct dlm_node *config_item_to_node(struct config_item *i)
446{
447 return i ? container_of(i, struct dlm_node, item) : NULL;
448}
449
450static struct config_group *make_cluster(struct config_group *g,
451 const char *name)
452{
453 struct dlm_cluster *cl = NULL;
454 struct dlm_spaces *sps = NULL;
455 struct dlm_comms *cms = NULL;
456 void *gps = NULL;
457
458 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
459 gps = kcalloc(3, sizeof(struct config_group *), GFP_NOFS);
460 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
461 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
462
463 if (!cl || !gps || !sps || !cms)
464 goto fail;
465
466 config_group_init_type_name(&cl->group, name, &cluster_type);
467 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
468 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
469
470 cl->group.default_groups = gps;
471 cl->group.default_groups[0] = &sps->ss_group;
472 cl->group.default_groups[1] = &cms->cs_group;
473 cl->group.default_groups[2] = NULL;
474
475 cl->cl_tcp_port = dlm_config.ci_tcp_port;
476 cl->cl_buffer_size = dlm_config.ci_buffer_size;
477 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
478 cl->cl_recover_timer = dlm_config.ci_recover_timer;
479 cl->cl_toss_secs = dlm_config.ci_toss_secs;
480 cl->cl_scan_secs = dlm_config.ci_scan_secs;
481 cl->cl_log_debug = dlm_config.ci_log_debug;
482 cl->cl_protocol = dlm_config.ci_protocol;
483 cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
484 cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
485 cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
486 cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
487 memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
488 DLM_LOCKSPACE_LEN);
489
490 space_list = &sps->ss_group;
491 comm_list = &cms->cs_group;
492 return &cl->group;
493
494 fail:
495 kfree(cl);
496 kfree(gps);
497 kfree(sps);
498 kfree(cms);
499 return ERR_PTR(-ENOMEM);
500}
501
502static void drop_cluster(struct config_group *g, struct config_item *i)
503{
504 struct dlm_cluster *cl = config_item_to_cluster(i);
505 struct config_item *tmp;
506 int j;
507
508 for (j = 0; cl->group.default_groups[j]; j++) {
509 tmp = &cl->group.default_groups[j]->cg_item;
510 cl->group.default_groups[j] = NULL;
511 config_item_put(tmp);
512 }
513
514 space_list = NULL;
515 comm_list = NULL;
516
517 config_item_put(i);
518}
519
520static void release_cluster(struct config_item *i)
521{
522 struct dlm_cluster *cl = config_item_to_cluster(i);
523 kfree(cl->group.default_groups);
524 kfree(cl);
525}
526
527static struct config_group *make_space(struct config_group *g, const char *name)
528{
529 struct dlm_space *sp = NULL;
530 struct dlm_nodes *nds = NULL;
531 void *gps = NULL;
532
533 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
534 gps = kcalloc(2, sizeof(struct config_group *), GFP_NOFS);
535 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
536
537 if (!sp || !gps || !nds)
538 goto fail;
539
540 config_group_init_type_name(&sp->group, name, &space_type);
541 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
542
543 sp->group.default_groups = gps;
544 sp->group.default_groups[0] = &nds->ns_group;
545 sp->group.default_groups[1] = NULL;
546
547 INIT_LIST_HEAD(&sp->members);
548 mutex_init(&sp->members_lock);
549 sp->members_count = 0;
550 return &sp->group;
551
552 fail:
553 kfree(sp);
554 kfree(gps);
555 kfree(nds);
556 return ERR_PTR(-ENOMEM);
557}
558
559static void drop_space(struct config_group *g, struct config_item *i)
560{
561 struct dlm_space *sp = config_item_to_space(i);
562 struct config_item *tmp;
563 int j;
564
565 /* assert list_empty(&sp->members) */
566
567 for (j = 0; sp->group.default_groups[j]; j++) {
568 tmp = &sp->group.default_groups[j]->cg_item;
569 sp->group.default_groups[j] = NULL;
570 config_item_put(tmp);
571 }
572
573 config_item_put(i);
574}
575
576static void release_space(struct config_item *i)
577{
578 struct dlm_space *sp = config_item_to_space(i);
579 kfree(sp->group.default_groups);
580 kfree(sp);
581}
582
583static struct config_item *make_comm(struct config_group *g, const char *name)
584{
585 struct dlm_comm *cm;
586
587 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
588 if (!cm)
589 return ERR_PTR(-ENOMEM);
590
591 config_item_init_type_name(&cm->item, name, &comm_type);
592
593 cm->seq = dlm_comm_count++;
594 if (!cm->seq)
595 cm->seq = dlm_comm_count++;
596
597 cm->nodeid = -1;
598 cm->local = 0;
599 cm->addr_count = 0;
600 return &cm->item;
601}
602
603static void drop_comm(struct config_group *g, struct config_item *i)
604{
605 struct dlm_comm *cm = config_item_to_comm(i);
606 if (local_comm == cm)
607 local_comm = NULL;
608 dlm_lowcomms_close(cm->nodeid);
609 while (cm->addr_count--)
610 kfree(cm->addr[cm->addr_count]);
611 config_item_put(i);
612}
613
614static void release_comm(struct config_item *i)
615{
616 struct dlm_comm *cm = config_item_to_comm(i);
617 kfree(cm);
618}
619
620static struct config_item *make_node(struct config_group *g, const char *name)
621{
622 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
623 struct dlm_node *nd;
624
625 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
626 if (!nd)
627 return ERR_PTR(-ENOMEM);
628
629 config_item_init_type_name(&nd->item, name, &node_type);
630 nd->nodeid = -1;
631 nd->weight = 1; /* default weight of 1 if none is set */
632 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
633
634 mutex_lock(&sp->members_lock);
635 list_add(&nd->list, &sp->members);
636 sp->members_count++;
637 mutex_unlock(&sp->members_lock);
638
639 return &nd->item;
640}
641
642static void drop_node(struct config_group *g, struct config_item *i)
643{
644 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
645 struct dlm_node *nd = config_item_to_node(i);
646
647 mutex_lock(&sp->members_lock);
648 list_del(&nd->list);
649 sp->members_count--;
650 mutex_unlock(&sp->members_lock);
651
652 config_item_put(i);
653}
654
655static void release_node(struct config_item *i)
656{
657 struct dlm_node *nd = config_item_to_node(i);
658 kfree(nd);
659}
660
661static struct dlm_clusters clusters_root = {
662 .subsys = {
663 .su_group = {
664 .cg_item = {
665 .ci_namebuf = "dlm",
666 .ci_type = &clusters_type,
667 },
668 },
669 },
670};
671
672int __init dlm_config_init(void)
673{
674 config_group_init(&clusters_root.subsys.su_group);
675 mutex_init(&clusters_root.subsys.su_mutex);
676 return configfs_register_subsystem(&clusters_root.subsys);
677}
678
679void dlm_config_exit(void)
680{
681 configfs_unregister_subsystem(&clusters_root.subsys);
682}
683
684/*
685 * Functions for user space to read/write attributes
686 */
687
688static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
689 char *buf)
690{
691 struct dlm_cluster *cl = config_item_to_cluster(i);
692 struct cluster_attribute *cla =
693 container_of(a, struct cluster_attribute, attr);
694 return cla->show ? cla->show(cl, buf) : 0;
695}
696
697static ssize_t store_cluster(struct config_item *i,
698 struct configfs_attribute *a,
699 const char *buf, size_t len)
700{
701 struct dlm_cluster *cl = config_item_to_cluster(i);
702 struct cluster_attribute *cla =
703 container_of(a, struct cluster_attribute, attr);
704 return cla->store ? cla->store(cl, buf, len) : -EINVAL;
705}
706
707static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
708 char *buf)
709{
710 struct dlm_comm *cm = config_item_to_comm(i);
711 struct comm_attribute *cma =
712 container_of(a, struct comm_attribute, attr);
713 return cma->show ? cma->show(cm, buf) : 0;
714}
715
716static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
717 const char *buf, size_t len)
718{
719 struct dlm_comm *cm = config_item_to_comm(i);
720 struct comm_attribute *cma =
721 container_of(a, struct comm_attribute, attr);
722 return cma->store ? cma->store(cm, buf, len) : -EINVAL;
723}
724
725static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf)
726{
727 return sprintf(buf, "%d\n", cm->nodeid);
728}
729
730static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
731 size_t len)
732{
733 cm->nodeid = simple_strtol(buf, NULL, 0);
734 return len;
735}
736
737static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
738{
739 return sprintf(buf, "%d\n", cm->local);
740}
741
742static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
743 size_t len)
744{
745 cm->local= simple_strtol(buf, NULL, 0);
746 if (cm->local && !local_comm)
747 local_comm = cm;
748 return len;
749}
750
751static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
752{
753 struct sockaddr_storage *addr;
754 int rv;
755
756 if (len != sizeof(struct sockaddr_storage))
757 return -EINVAL;
758
759 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
760 return -ENOSPC;
761
762 addr = kzalloc(sizeof(*addr), GFP_NOFS);
763 if (!addr)
764 return -ENOMEM;
765
766 memcpy(addr, buf, len);
767
768 rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
769 if (rv) {
770 kfree(addr);
771 return rv;
772 }
773
774 cm->addr[cm->addr_count++] = addr;
775 return len;
776}
777
778static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf)
779{
780 ssize_t s;
781 ssize_t allowance;
782 int i;
783 struct sockaddr_storage *addr;
784 struct sockaddr_in *addr_in;
785 struct sockaddr_in6 *addr_in6;
786
787 /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
788 char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
789
790
791 /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
792 allowance = 4096;
793 buf[0] = '\0';
794
795 for (i = 0; i < cm->addr_count; i++) {
796 addr = cm->addr[i];
797
798 switch(addr->ss_family) {
799 case AF_INET:
800 addr_in = (struct sockaddr_in *)addr;
801 s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr);
802 break;
803 case AF_INET6:
804 addr_in6 = (struct sockaddr_in6 *)addr;
805 s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr);
806 break;
807 default:
808 s = sprintf(buf0, "%s\n", "<UNKNOWN>");
809 break;
810 }
811 allowance -= s;
812 if (allowance >= 0)
813 strcat(buf, buf0);
814 else {
815 allowance += s;
816 break;
817 }
818 }
819 return 4096 - allowance;
820}
821
822static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
823 char *buf)
824{
825 struct dlm_node *nd = config_item_to_node(i);
826 struct node_attribute *nda =
827 container_of(a, struct node_attribute, attr);
828 return nda->show ? nda->show(nd, buf) : 0;
829}
830
831static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
832 const char *buf, size_t len)
833{
834 struct dlm_node *nd = config_item_to_node(i);
835 struct node_attribute *nda =
836 container_of(a, struct node_attribute, attr);
837 return nda->store ? nda->store(nd, buf, len) : -EINVAL;
838}
839
840static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
841{
842 return sprintf(buf, "%d\n", nd->nodeid);
843}
844
845static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
846 size_t len)
847{
848 uint32_t seq = 0;
849 nd->nodeid = simple_strtol(buf, NULL, 0);
850 dlm_comm_seq(nd->nodeid, &seq);
851 nd->comm_seq = seq;
852 return len;
853}
854
855static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
856{
857 return sprintf(buf, "%d\n", nd->weight);
858}
859
860static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
861 size_t len)
862{
863 nd->weight = simple_strtol(buf, NULL, 0);
864 return len;
865}
866
867/*
868 * Functions for the dlm to get the info that's been configured
869 */
870
871static struct dlm_space *get_space(char *name)
872{
873 struct config_item *i;
874
875 if (!space_list)
876 return NULL;
877
878 mutex_lock(&space_list->cg_subsys->su_mutex);
879 i = config_group_find_item(space_list, name);
880 mutex_unlock(&space_list->cg_subsys->su_mutex);
881
882 return config_item_to_space(i);
883}
884
885static void put_space(struct dlm_space *sp)
886{
887 config_item_put(&sp->group.cg_item);
888}
889
890static struct dlm_comm *get_comm(int nodeid)
891{
892 struct config_item *i;
893 struct dlm_comm *cm = NULL;
894 int found = 0;
895
896 if (!comm_list)
897 return NULL;
898
899 mutex_lock(&clusters_root.subsys.su_mutex);
900
901 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
902 cm = config_item_to_comm(i);
903
904 if (cm->nodeid != nodeid)
905 continue;
906 found = 1;
907 config_item_get(i);
908 break;
909 }
910 mutex_unlock(&clusters_root.subsys.su_mutex);
911
912 if (!found)
913 cm = NULL;
914 return cm;
915}
916
917static void put_comm(struct dlm_comm *cm)
918{
919 config_item_put(&cm->item);
920}
921
922/* caller must free mem */
923int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
924 int *count_out)
925{
926 struct dlm_space *sp;
927 struct dlm_node *nd;
928 struct dlm_config_node *nodes, *node;
929 int rv, count;
930
931 sp = get_space(lsname);
932 if (!sp)
933 return -EEXIST;
934
935 mutex_lock(&sp->members_lock);
936 if (!sp->members_count) {
937 rv = -EINVAL;
938 printk(KERN_ERR "dlm: zero members_count\n");
939 goto out;
940 }
941
942 count = sp->members_count;
943
944 nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
945 if (!nodes) {
946 rv = -ENOMEM;
947 goto out;
948 }
949
950 node = nodes;
951 list_for_each_entry(nd, &sp->members, list) {
952 node->nodeid = nd->nodeid;
953 node->weight = nd->weight;
954 node->new = nd->new;
955 node->comm_seq = nd->comm_seq;
956 node++;
957
958 nd->new = 0;
959 }
960
961 *count_out = count;
962 *nodes_out = nodes;
963 rv = 0;
964 out:
965 mutex_unlock(&sp->members_lock);
966 put_space(sp);
967 return rv;
968}
969
970int dlm_comm_seq(int nodeid, uint32_t *seq)
971{
972 struct dlm_comm *cm = get_comm(nodeid);
973 if (!cm)
974 return -EEXIST;
975 *seq = cm->seq;
976 put_comm(cm);
977 return 0;
978}
979
980int dlm_our_nodeid(void)
981{
982 return local_comm ? local_comm->nodeid : 0;
983}
984
985/* num 0 is first addr, num 1 is second addr */
986int dlm_our_addr(struct sockaddr_storage *addr, int num)
987{
988 if (!local_comm)
989 return -1;
990 if (num + 1 > local_comm->addr_count)
991 return -1;
992 memcpy(addr, local_comm->addr[num], sizeof(*addr));
993 return 0;
994}
995
996/* Config file defaults */
997#define DEFAULT_TCP_PORT 21064
998#define DEFAULT_BUFFER_SIZE 4096
999#define DEFAULT_RSBTBL_SIZE 1024
1000#define DEFAULT_RECOVER_TIMER 5
1001#define DEFAULT_TOSS_SECS 10
1002#define DEFAULT_SCAN_SECS 5
1003#define DEFAULT_LOG_DEBUG 0
1004#define DEFAULT_PROTOCOL 0
1005#define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */
1006#define DEFAULT_WAITWARN_US 0
1007#define DEFAULT_NEW_RSB_COUNT 128
1008#define DEFAULT_RECOVER_CALLBACKS 0
1009#define DEFAULT_CLUSTER_NAME ""
1010
1011struct dlm_config_info dlm_config = {
1012 .ci_tcp_port = DEFAULT_TCP_PORT,
1013 .ci_buffer_size = DEFAULT_BUFFER_SIZE,
1014 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
1015 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
1016 .ci_toss_secs = DEFAULT_TOSS_SECS,
1017 .ci_scan_secs = DEFAULT_SCAN_SECS,
1018 .ci_log_debug = DEFAULT_LOG_DEBUG,
1019 .ci_protocol = DEFAULT_PROTOCOL,
1020 .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
1021 .ci_waitwarn_us = DEFAULT_WAITWARN_US,
1022 .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
1023 .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
1024 .ci_cluster_name = DEFAULT_CLUSTER_NAME
1025};
1026