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