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