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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_timewarn_cs;
79 unsigned int cl_waitwarn_us;
80 unsigned int cl_new_rsb_count;
81 unsigned int cl_recover_callbacks;
82 char cl_cluster_name[DLM_LOCKSPACE_LEN];
83
84 struct dlm_spaces *sps;
85 struct dlm_comms *cms;
86};
87
88static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
89{
90 return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
91 NULL;
92}
93
94enum {
95 CLUSTER_ATTR_TCP_PORT = 0,
96 CLUSTER_ATTR_BUFFER_SIZE,
97 CLUSTER_ATTR_RSBTBL_SIZE,
98 CLUSTER_ATTR_RECOVER_TIMER,
99 CLUSTER_ATTR_TOSS_SECS,
100 CLUSTER_ATTR_SCAN_SECS,
101 CLUSTER_ATTR_LOG_DEBUG,
102 CLUSTER_ATTR_LOG_INFO,
103 CLUSTER_ATTR_PROTOCOL,
104 CLUSTER_ATTR_MARK,
105 CLUSTER_ATTR_TIMEWARN_CS,
106 CLUSTER_ATTR_WAITWARN_US,
107 CLUSTER_ATTR_NEW_RSB_COUNT,
108 CLUSTER_ATTR_RECOVER_CALLBACKS,
109 CLUSTER_ATTR_CLUSTER_NAME,
110};
111
112static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
113{
114 struct dlm_cluster *cl = config_item_to_cluster(item);
115 return sprintf(buf, "%s\n", cl->cl_cluster_name);
116}
117
118static ssize_t cluster_cluster_name_store(struct config_item *item,
119 const char *buf, size_t len)
120{
121 struct dlm_cluster *cl = config_item_to_cluster(item);
122
123 strlcpy(dlm_config.ci_cluster_name, buf,
124 sizeof(dlm_config.ci_cluster_name));
125 strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
126 return len;
127}
128
129CONFIGFS_ATTR(cluster_, cluster_name);
130
131static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
132 int *info_field, int (*check_cb)(unsigned int x),
133 const char *buf, size_t len)
134{
135 unsigned int x;
136 int rc;
137
138 if (!capable(CAP_SYS_ADMIN))
139 return -EPERM;
140 rc = kstrtouint(buf, 0, &x);
141 if (rc)
142 return rc;
143
144 if (check_cb) {
145 rc = check_cb(x);
146 if (rc)
147 return rc;
148 }
149
150 *cl_field = x;
151 *info_field = x;
152
153 return len;
154}
155
156#define CLUSTER_ATTR(name, check_cb) \
157static ssize_t cluster_##name##_store(struct config_item *item, \
158 const char *buf, size_t len) \
159{ \
160 struct dlm_cluster *cl = config_item_to_cluster(item); \
161 return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \
162 check_cb, buf, len); \
163} \
164static ssize_t cluster_##name##_show(struct config_item *item, char *buf) \
165{ \
166 struct dlm_cluster *cl = config_item_to_cluster(item); \
167 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
168} \
169CONFIGFS_ATTR(cluster_, name);
170
171static int dlm_check_protocol_and_dlm_running(unsigned int x)
172{
173 switch (x) {
174 case 0:
175 /* TCP */
176 break;
177 case 1:
178 /* SCTP */
179 break;
180 default:
181 return -EINVAL;
182 }
183
184 if (dlm_allow_conn)
185 return -EBUSY;
186
187 return 0;
188}
189
190static int dlm_check_zero_and_dlm_running(unsigned int x)
191{
192 if (!x)
193 return -EINVAL;
194
195 if (dlm_allow_conn)
196 return -EBUSY;
197
198 return 0;
199}
200
201static int dlm_check_zero(unsigned int x)
202{
203 if (!x)
204 return -EINVAL;
205
206 return 0;
207}
208
209static int dlm_check_buffer_size(unsigned int x)
210{
211 if (x < DLM_MAX_SOCKET_BUFSIZE)
212 return -EINVAL;
213
214 return 0;
215}
216
217CLUSTER_ATTR(tcp_port, dlm_check_zero_and_dlm_running);
218CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
219CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
220CLUSTER_ATTR(recover_timer, dlm_check_zero);
221CLUSTER_ATTR(toss_secs, dlm_check_zero);
222CLUSTER_ATTR(scan_secs, dlm_check_zero);
223CLUSTER_ATTR(log_debug, NULL);
224CLUSTER_ATTR(log_info, NULL);
225CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
226CLUSTER_ATTR(mark, NULL);
227CLUSTER_ATTR(timewarn_cs, dlm_check_zero);
228CLUSTER_ATTR(waitwarn_us, NULL);
229CLUSTER_ATTR(new_rsb_count, NULL);
230CLUSTER_ATTR(recover_callbacks, NULL);
231
232static struct configfs_attribute *cluster_attrs[] = {
233 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
234 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
235 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
236 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
237 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
238 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
239 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
240 [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
241 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
242 [CLUSTER_ATTR_MARK] = &cluster_attr_mark,
243 [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
244 [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
245 [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
246 [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
247 [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
248 NULL,
249};
250
251enum {
252 COMM_ATTR_NODEID = 0,
253 COMM_ATTR_LOCAL,
254 COMM_ATTR_ADDR,
255 COMM_ATTR_ADDR_LIST,
256 COMM_ATTR_MARK,
257};
258
259enum {
260 NODE_ATTR_NODEID = 0,
261 NODE_ATTR_WEIGHT,
262};
263
264struct dlm_clusters {
265 struct configfs_subsystem subsys;
266};
267
268struct dlm_spaces {
269 struct config_group ss_group;
270};
271
272struct dlm_space {
273 struct config_group group;
274 struct list_head members;
275 struct mutex members_lock;
276 int members_count;
277 struct dlm_nodes *nds;
278};
279
280struct dlm_comms {
281 struct config_group cs_group;
282};
283
284struct dlm_comm {
285 struct config_item item;
286 int seq;
287 int nodeid;
288 int local;
289 int addr_count;
290 unsigned int mark;
291 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
292};
293
294struct dlm_nodes {
295 struct config_group ns_group;
296};
297
298struct dlm_node {
299 struct config_item item;
300 struct list_head list; /* space->members */
301 int nodeid;
302 int weight;
303 int new;
304 int comm_seq; /* copy of cm->seq when nd->nodeid is set */
305};
306
307static struct configfs_group_operations clusters_ops = {
308 .make_group = make_cluster,
309 .drop_item = drop_cluster,
310};
311
312static struct configfs_item_operations cluster_ops = {
313 .release = release_cluster,
314};
315
316static struct configfs_group_operations spaces_ops = {
317 .make_group = make_space,
318 .drop_item = drop_space,
319};
320
321static struct configfs_item_operations space_ops = {
322 .release = release_space,
323};
324
325static struct configfs_group_operations comms_ops = {
326 .make_item = make_comm,
327 .drop_item = drop_comm,
328};
329
330static struct configfs_item_operations comm_ops = {
331 .release = release_comm,
332};
333
334static struct configfs_group_operations nodes_ops = {
335 .make_item = make_node,
336 .drop_item = drop_node,
337};
338
339static struct configfs_item_operations node_ops = {
340 .release = release_node,
341};
342
343static const struct config_item_type clusters_type = {
344 .ct_group_ops = &clusters_ops,
345 .ct_owner = THIS_MODULE,
346};
347
348static const struct config_item_type cluster_type = {
349 .ct_item_ops = &cluster_ops,
350 .ct_attrs = cluster_attrs,
351 .ct_owner = THIS_MODULE,
352};
353
354static const struct config_item_type spaces_type = {
355 .ct_group_ops = &spaces_ops,
356 .ct_owner = THIS_MODULE,
357};
358
359static const struct config_item_type space_type = {
360 .ct_item_ops = &space_ops,
361 .ct_owner = THIS_MODULE,
362};
363
364static const struct config_item_type comms_type = {
365 .ct_group_ops = &comms_ops,
366 .ct_owner = THIS_MODULE,
367};
368
369static const struct config_item_type comm_type = {
370 .ct_item_ops = &comm_ops,
371 .ct_attrs = comm_attrs,
372 .ct_owner = THIS_MODULE,
373};
374
375static const struct config_item_type nodes_type = {
376 .ct_group_ops = &nodes_ops,
377 .ct_owner = THIS_MODULE,
378};
379
380static const struct config_item_type node_type = {
381 .ct_item_ops = &node_ops,
382 .ct_attrs = node_attrs,
383 .ct_owner = THIS_MODULE,
384};
385
386static struct dlm_space *config_item_to_space(struct config_item *i)
387{
388 return i ? container_of(to_config_group(i), struct dlm_space, group) :
389 NULL;
390}
391
392static struct dlm_comm *config_item_to_comm(struct config_item *i)
393{
394 return i ? container_of(i, struct dlm_comm, item) : NULL;
395}
396
397static struct dlm_node *config_item_to_node(struct config_item *i)
398{
399 return i ? container_of(i, struct dlm_node, item) : NULL;
400}
401
402static struct config_group *make_cluster(struct config_group *g,
403 const char *name)
404{
405 struct dlm_cluster *cl = NULL;
406 struct dlm_spaces *sps = NULL;
407 struct dlm_comms *cms = NULL;
408
409 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
410 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
411 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
412
413 if (!cl || !sps || !cms)
414 goto fail;
415
416 cl->sps = sps;
417 cl->cms = cms;
418
419 config_group_init_type_name(&cl->group, name, &cluster_type);
420 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
421 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
422
423 configfs_add_default_group(&sps->ss_group, &cl->group);
424 configfs_add_default_group(&cms->cs_group, &cl->group);
425
426 cl->cl_tcp_port = dlm_config.ci_tcp_port;
427 cl->cl_buffer_size = dlm_config.ci_buffer_size;
428 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
429 cl->cl_recover_timer = dlm_config.ci_recover_timer;
430 cl->cl_toss_secs = dlm_config.ci_toss_secs;
431 cl->cl_scan_secs = dlm_config.ci_scan_secs;
432 cl->cl_log_debug = dlm_config.ci_log_debug;
433 cl->cl_log_info = dlm_config.ci_log_info;
434 cl->cl_protocol = dlm_config.ci_protocol;
435 cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
436 cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
437 cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
438 cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
439 memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
440 DLM_LOCKSPACE_LEN);
441
442 space_list = &sps->ss_group;
443 comm_list = &cms->cs_group;
444 return &cl->group;
445
446 fail:
447 kfree(cl);
448 kfree(sps);
449 kfree(cms);
450 return ERR_PTR(-ENOMEM);
451}
452
453static void drop_cluster(struct config_group *g, struct config_item *i)
454{
455 struct dlm_cluster *cl = config_item_to_cluster(i);
456
457 configfs_remove_default_groups(&cl->group);
458
459 space_list = NULL;
460 comm_list = NULL;
461
462 config_item_put(i);
463}
464
465static void release_cluster(struct config_item *i)
466{
467 struct dlm_cluster *cl = config_item_to_cluster(i);
468
469 kfree(cl->sps);
470 kfree(cl->cms);
471 kfree(cl);
472}
473
474static struct config_group *make_space(struct config_group *g, const char *name)
475{
476 struct dlm_space *sp = NULL;
477 struct dlm_nodes *nds = NULL;
478
479 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
480 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
481
482 if (!sp || !nds)
483 goto fail;
484
485 config_group_init_type_name(&sp->group, name, &space_type);
486
487 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
488 configfs_add_default_group(&nds->ns_group, &sp->group);
489
490 INIT_LIST_HEAD(&sp->members);
491 mutex_init(&sp->members_lock);
492 sp->members_count = 0;
493 sp->nds = nds;
494 return &sp->group;
495
496 fail:
497 kfree(sp);
498 kfree(nds);
499 return ERR_PTR(-ENOMEM);
500}
501
502static void drop_space(struct config_group *g, struct config_item *i)
503{
504 struct dlm_space *sp = config_item_to_space(i);
505
506 /* assert list_empty(&sp->members) */
507
508 configfs_remove_default_groups(&sp->group);
509 config_item_put(i);
510}
511
512static void release_space(struct config_item *i)
513{
514 struct dlm_space *sp = config_item_to_space(i);
515 kfree(sp->nds);
516 kfree(sp);
517}
518
519static struct config_item *make_comm(struct config_group *g, const char *name)
520{
521 struct dlm_comm *cm;
522
523 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
524 if (!cm)
525 return ERR_PTR(-ENOMEM);
526
527 config_item_init_type_name(&cm->item, name, &comm_type);
528
529 cm->seq = dlm_comm_count++;
530 if (!cm->seq)
531 cm->seq = dlm_comm_count++;
532
533 cm->nodeid = -1;
534 cm->local = 0;
535 cm->addr_count = 0;
536 cm->mark = 0;
537 return &cm->item;
538}
539
540static void drop_comm(struct config_group *g, struct config_item *i)
541{
542 struct dlm_comm *cm = config_item_to_comm(i);
543 if (local_comm == cm)
544 local_comm = NULL;
545 dlm_midcomms_close(cm->nodeid);
546 while (cm->addr_count--)
547 kfree(cm->addr[cm->addr_count]);
548 config_item_put(i);
549}
550
551static void release_comm(struct config_item *i)
552{
553 struct dlm_comm *cm = config_item_to_comm(i);
554 kfree(cm);
555}
556
557static struct config_item *make_node(struct config_group *g, const char *name)
558{
559 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
560 struct dlm_node *nd;
561
562 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
563 if (!nd)
564 return ERR_PTR(-ENOMEM);
565
566 config_item_init_type_name(&nd->item, name, &node_type);
567 nd->nodeid = -1;
568 nd->weight = 1; /* default weight of 1 if none is set */
569 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
570
571 mutex_lock(&sp->members_lock);
572 list_add(&nd->list, &sp->members);
573 sp->members_count++;
574 mutex_unlock(&sp->members_lock);
575
576 return &nd->item;
577}
578
579static void drop_node(struct config_group *g, struct config_item *i)
580{
581 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
582 struct dlm_node *nd = config_item_to_node(i);
583
584 mutex_lock(&sp->members_lock);
585 list_del(&nd->list);
586 sp->members_count--;
587 mutex_unlock(&sp->members_lock);
588
589 config_item_put(i);
590}
591
592static void release_node(struct config_item *i)
593{
594 struct dlm_node *nd = config_item_to_node(i);
595 kfree(nd);
596}
597
598static struct dlm_clusters clusters_root = {
599 .subsys = {
600 .su_group = {
601 .cg_item = {
602 .ci_namebuf = "dlm",
603 .ci_type = &clusters_type,
604 },
605 },
606 },
607};
608
609int __init dlm_config_init(void)
610{
611 config_group_init(&clusters_root.subsys.su_group);
612 mutex_init(&clusters_root.subsys.su_mutex);
613 return configfs_register_subsystem(&clusters_root.subsys);
614}
615
616void dlm_config_exit(void)
617{
618 configfs_unregister_subsystem(&clusters_root.subsys);
619}
620
621/*
622 * Functions for user space to read/write attributes
623 */
624
625static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
626{
627 return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
628}
629
630static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
631 size_t len)
632{
633 int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
634
635 if (rc)
636 return rc;
637 return len;
638}
639
640static ssize_t comm_local_show(struct config_item *item, char *buf)
641{
642 return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
643}
644
645static ssize_t comm_local_store(struct config_item *item, const char *buf,
646 size_t len)
647{
648 struct dlm_comm *cm = config_item_to_comm(item);
649 int rc = kstrtoint(buf, 0, &cm->local);
650
651 if (rc)
652 return rc;
653 if (cm->local && !local_comm)
654 local_comm = cm;
655 return len;
656}
657
658static ssize_t comm_addr_store(struct config_item *item, const char *buf,
659 size_t len)
660{
661 struct dlm_comm *cm = config_item_to_comm(item);
662 struct sockaddr_storage *addr;
663 int rv;
664
665 if (len != sizeof(struct sockaddr_storage))
666 return -EINVAL;
667
668 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
669 return -ENOSPC;
670
671 addr = kzalloc(sizeof(*addr), GFP_NOFS);
672 if (!addr)
673 return -ENOMEM;
674
675 memcpy(addr, buf, len);
676
677 rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
678 if (rv) {
679 kfree(addr);
680 return rv;
681 }
682
683 cm->addr[cm->addr_count++] = addr;
684 return len;
685}
686
687static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
688{
689 struct dlm_comm *cm = config_item_to_comm(item);
690 ssize_t s;
691 ssize_t allowance;
692 int i;
693 struct sockaddr_storage *addr;
694 struct sockaddr_in *addr_in;
695 struct sockaddr_in6 *addr_in6;
696
697 /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
698 char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
699
700
701 /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
702 allowance = 4096;
703 buf[0] = '\0';
704
705 for (i = 0; i < cm->addr_count; i++) {
706 addr = cm->addr[i];
707
708 switch(addr->ss_family) {
709 case AF_INET:
710 addr_in = (struct sockaddr_in *)addr;
711 s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr);
712 break;
713 case AF_INET6:
714 addr_in6 = (struct sockaddr_in6 *)addr;
715 s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr);
716 break;
717 default:
718 s = sprintf(buf0, "%s\n", "<UNKNOWN>");
719 break;
720 }
721 allowance -= s;
722 if (allowance >= 0)
723 strcat(buf, buf0);
724 else {
725 allowance += s;
726 break;
727 }
728 }
729 return 4096 - allowance;
730}
731
732static ssize_t comm_mark_show(struct config_item *item, char *buf)
733{
734 return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
735}
736
737static ssize_t comm_mark_store(struct config_item *item, const char *buf,
738 size_t len)
739{
740 struct dlm_comm *comm;
741 unsigned int mark;
742 int rc;
743
744 rc = kstrtouint(buf, 0, &mark);
745 if (rc)
746 return rc;
747
748 if (mark == 0)
749 mark = dlm_config.ci_mark;
750
751 comm = config_item_to_comm(item);
752 rc = dlm_lowcomms_nodes_set_mark(comm->nodeid, mark);
753 if (rc)
754 return rc;
755
756 comm->mark = mark;
757 return len;
758}
759
760CONFIGFS_ATTR(comm_, nodeid);
761CONFIGFS_ATTR(comm_, local);
762CONFIGFS_ATTR(comm_, mark);
763CONFIGFS_ATTR_WO(comm_, addr);
764CONFIGFS_ATTR_RO(comm_, addr_list);
765
766static struct configfs_attribute *comm_attrs[] = {
767 [COMM_ATTR_NODEID] = &comm_attr_nodeid,
768 [COMM_ATTR_LOCAL] = &comm_attr_local,
769 [COMM_ATTR_ADDR] = &comm_attr_addr,
770 [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
771 [COMM_ATTR_MARK] = &comm_attr_mark,
772 NULL,
773};
774
775static ssize_t node_nodeid_show(struct config_item *item, char *buf)
776{
777 return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
778}
779
780static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
781 size_t len)
782{
783 struct dlm_node *nd = config_item_to_node(item);
784 uint32_t seq = 0;
785 int rc = kstrtoint(buf, 0, &nd->nodeid);
786
787 if (rc)
788 return rc;
789 dlm_comm_seq(nd->nodeid, &seq);
790 nd->comm_seq = seq;
791 return len;
792}
793
794static ssize_t node_weight_show(struct config_item *item, char *buf)
795{
796 return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
797}
798
799static ssize_t node_weight_store(struct config_item *item, const char *buf,
800 size_t len)
801{
802 int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
803
804 if (rc)
805 return rc;
806 return len;
807}
808
809CONFIGFS_ATTR(node_, nodeid);
810CONFIGFS_ATTR(node_, weight);
811
812static struct configfs_attribute *node_attrs[] = {
813 [NODE_ATTR_NODEID] = &node_attr_nodeid,
814 [NODE_ATTR_WEIGHT] = &node_attr_weight,
815 NULL,
816};
817
818/*
819 * Functions for the dlm to get the info that's been configured
820 */
821
822static struct dlm_space *get_space(char *name)
823{
824 struct config_item *i;
825
826 if (!space_list)
827 return NULL;
828
829 mutex_lock(&space_list->cg_subsys->su_mutex);
830 i = config_group_find_item(space_list, name);
831 mutex_unlock(&space_list->cg_subsys->su_mutex);
832
833 return config_item_to_space(i);
834}
835
836static void put_space(struct dlm_space *sp)
837{
838 config_item_put(&sp->group.cg_item);
839}
840
841static struct dlm_comm *get_comm(int nodeid)
842{
843 struct config_item *i;
844 struct dlm_comm *cm = NULL;
845 int found = 0;
846
847 if (!comm_list)
848 return NULL;
849
850 mutex_lock(&clusters_root.subsys.su_mutex);
851
852 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
853 cm = config_item_to_comm(i);
854
855 if (cm->nodeid != nodeid)
856 continue;
857 found = 1;
858 config_item_get(i);
859 break;
860 }
861 mutex_unlock(&clusters_root.subsys.su_mutex);
862
863 if (!found)
864 cm = NULL;
865 return cm;
866}
867
868static void put_comm(struct dlm_comm *cm)
869{
870 config_item_put(&cm->item);
871}
872
873/* caller must free mem */
874int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
875 int *count_out)
876{
877 struct dlm_space *sp;
878 struct dlm_node *nd;
879 struct dlm_config_node *nodes, *node;
880 int rv, count;
881
882 sp = get_space(lsname);
883 if (!sp)
884 return -EEXIST;
885
886 mutex_lock(&sp->members_lock);
887 if (!sp->members_count) {
888 rv = -EINVAL;
889 printk(KERN_ERR "dlm: zero members_count\n");
890 goto out;
891 }
892
893 count = sp->members_count;
894
895 nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
896 if (!nodes) {
897 rv = -ENOMEM;
898 goto out;
899 }
900
901 node = nodes;
902 list_for_each_entry(nd, &sp->members, list) {
903 node->nodeid = nd->nodeid;
904 node->weight = nd->weight;
905 node->new = nd->new;
906 node->comm_seq = nd->comm_seq;
907 node++;
908
909 nd->new = 0;
910 }
911
912 *count_out = count;
913 *nodes_out = nodes;
914 rv = 0;
915 out:
916 mutex_unlock(&sp->members_lock);
917 put_space(sp);
918 return rv;
919}
920
921int dlm_comm_seq(int nodeid, uint32_t *seq)
922{
923 struct dlm_comm *cm = get_comm(nodeid);
924 if (!cm)
925 return -EEXIST;
926 *seq = cm->seq;
927 put_comm(cm);
928 return 0;
929}
930
931int dlm_our_nodeid(void)
932{
933 return local_comm ? local_comm->nodeid : 0;
934}
935
936/* num 0 is first addr, num 1 is second addr */
937int dlm_our_addr(struct sockaddr_storage *addr, int num)
938{
939 if (!local_comm)
940 return -1;
941 if (num + 1 > local_comm->addr_count)
942 return -1;
943 memcpy(addr, local_comm->addr[num], sizeof(*addr));
944 return 0;
945}
946
947/* Config file defaults */
948#define DEFAULT_TCP_PORT 21064
949#define DEFAULT_RSBTBL_SIZE 1024
950#define DEFAULT_RECOVER_TIMER 5
951#define DEFAULT_TOSS_SECS 10
952#define DEFAULT_SCAN_SECS 5
953#define DEFAULT_LOG_DEBUG 0
954#define DEFAULT_LOG_INFO 1
955#define DEFAULT_PROTOCOL DLM_PROTO_TCP
956#define DEFAULT_MARK 0
957#define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */
958#define DEFAULT_WAITWARN_US 0
959#define DEFAULT_NEW_RSB_COUNT 128
960#define DEFAULT_RECOVER_CALLBACKS 0
961#define DEFAULT_CLUSTER_NAME ""
962
963struct dlm_config_info dlm_config = {
964 .ci_tcp_port = DEFAULT_TCP_PORT,
965 .ci_buffer_size = DLM_MAX_SOCKET_BUFSIZE,
966 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
967 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
968 .ci_toss_secs = DEFAULT_TOSS_SECS,
969 .ci_scan_secs = DEFAULT_SCAN_SECS,
970 .ci_log_debug = DEFAULT_LOG_DEBUG,
971 .ci_log_info = DEFAULT_LOG_INFO,
972 .ci_protocol = DEFAULT_PROTOCOL,
973 .ci_mark = DEFAULT_MARK,
974 .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
975 .ci_waitwarn_us = DEFAULT_WAITWARN_US,
976 .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
977 .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
978 .ci_cluster_name = DEFAULT_CLUSTER_NAME
979};
980
1/******************************************************************************
2*******************************************************************************
3**
4** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
6**
7** This copyrighted material is made available to anyone wishing to use,
8** modify, copy, or redistribute it subject to the terms and conditions
9** of the GNU General Public License v.2.
10**
11*******************************************************************************
12******************************************************************************/
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/configfs.h>
17#include <linux/slab.h>
18#include <linux/in.h>
19#include <linux/in6.h>
20#include <linux/dlmconstants.h>
21#include <net/ipv6.h>
22#include <net/sock.h>
23
24#include "config.h"
25#include "lowcomms.h"
26
27/*
28 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
29 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
30 * /config/dlm/<cluster>/comms/<comm>/nodeid
31 * /config/dlm/<cluster>/comms/<comm>/local
32 * /config/dlm/<cluster>/comms/<comm>/addr (write only)
33 * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
34 * The <cluster> level is useless, but I haven't figured out how to avoid it.
35 */
36
37static struct config_group *space_list;
38static struct config_group *comm_list;
39static struct dlm_comm *local_comm;
40static uint32_t dlm_comm_count;
41
42struct dlm_clusters;
43struct dlm_cluster;
44struct dlm_spaces;
45struct dlm_space;
46struct dlm_comms;
47struct dlm_comm;
48struct dlm_nodes;
49struct dlm_node;
50
51static struct config_group *make_cluster(struct config_group *, const char *);
52static void drop_cluster(struct config_group *, struct config_item *);
53static void release_cluster(struct config_item *);
54static struct config_group *make_space(struct config_group *, const char *);
55static void drop_space(struct config_group *, struct config_item *);
56static void release_space(struct config_item *);
57static struct config_item *make_comm(struct config_group *, const char *);
58static void drop_comm(struct config_group *, struct config_item *);
59static void release_comm(struct config_item *);
60static struct config_item *make_node(struct config_group *, const char *);
61static void drop_node(struct config_group *, struct config_item *);
62static void release_node(struct config_item *);
63
64static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
65 char *buf);
66static ssize_t store_cluster(struct config_item *i,
67 struct configfs_attribute *a,
68 const char *buf, size_t len);
69static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
70 char *buf);
71static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
72 const char *buf, size_t len);
73static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
74 char *buf);
75static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
76 const char *buf, size_t len);
77
78static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf);
79static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
80 size_t len);
81static ssize_t comm_local_read(struct dlm_comm *cm, char *buf);
82static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
83 size_t len);
84static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf,
85 size_t len);
86static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf);
87static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf);
88static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
89 size_t len);
90static ssize_t node_weight_read(struct dlm_node *nd, char *buf);
91static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
92 size_t len);
93
94struct dlm_cluster {
95 struct config_group group;
96 unsigned int cl_tcp_port;
97 unsigned int cl_buffer_size;
98 unsigned int cl_rsbtbl_size;
99 unsigned int cl_dirtbl_size;
100 unsigned int cl_recover_timer;
101 unsigned int cl_toss_secs;
102 unsigned int cl_scan_secs;
103 unsigned int cl_log_debug;
104 unsigned int cl_protocol;
105 unsigned int cl_timewarn_cs;
106 unsigned int cl_waitwarn_us;
107 unsigned int cl_new_rsb_count;
108 unsigned int cl_recover_callbacks;
109 char cl_cluster_name[DLM_LOCKSPACE_LEN];
110};
111
112enum {
113 CLUSTER_ATTR_TCP_PORT = 0,
114 CLUSTER_ATTR_BUFFER_SIZE,
115 CLUSTER_ATTR_RSBTBL_SIZE,
116 CLUSTER_ATTR_DIRTBL_SIZE,
117 CLUSTER_ATTR_RECOVER_TIMER,
118 CLUSTER_ATTR_TOSS_SECS,
119 CLUSTER_ATTR_SCAN_SECS,
120 CLUSTER_ATTR_LOG_DEBUG,
121 CLUSTER_ATTR_PROTOCOL,
122 CLUSTER_ATTR_TIMEWARN_CS,
123 CLUSTER_ATTR_WAITWARN_US,
124 CLUSTER_ATTR_NEW_RSB_COUNT,
125 CLUSTER_ATTR_RECOVER_CALLBACKS,
126 CLUSTER_ATTR_CLUSTER_NAME,
127};
128
129struct cluster_attribute {
130 struct configfs_attribute attr;
131 ssize_t (*show)(struct dlm_cluster *, char *);
132 ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
133};
134
135static ssize_t cluster_cluster_name_read(struct dlm_cluster *cl, char *buf)
136{
137 return sprintf(buf, "%s\n", cl->cl_cluster_name);
138}
139
140static ssize_t cluster_cluster_name_write(struct dlm_cluster *cl,
141 const char *buf, size_t len)
142{
143 strncpy(dlm_config.ci_cluster_name, buf, DLM_LOCKSPACE_LEN);
144 strncpy(cl->cl_cluster_name, buf, DLM_LOCKSPACE_LEN);
145 return len;
146}
147
148static struct cluster_attribute cluster_attr_cluster_name = {
149 .attr = { .ca_owner = THIS_MODULE,
150 .ca_name = "cluster_name",
151 .ca_mode = S_IRUGO | S_IWUSR },
152 .show = cluster_cluster_name_read,
153 .store = cluster_cluster_name_write,
154};
155
156static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
157 int *info_field, int check_zero,
158 const char *buf, size_t len)
159{
160 unsigned int x;
161
162 if (!capable(CAP_SYS_ADMIN))
163 return -EACCES;
164
165 x = simple_strtoul(buf, NULL, 0);
166
167 if (check_zero && !x)
168 return -EINVAL;
169
170 *cl_field = x;
171 *info_field = x;
172
173 return len;
174}
175
176#define CLUSTER_ATTR(name, check_zero) \
177static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
178{ \
179 return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \
180 check_zero, buf, len); \
181} \
182static ssize_t name##_read(struct dlm_cluster *cl, char *buf) \
183{ \
184 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
185} \
186static struct cluster_attribute cluster_attr_##name = \
187__CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
188
189CLUSTER_ATTR(tcp_port, 1);
190CLUSTER_ATTR(buffer_size, 1);
191CLUSTER_ATTR(rsbtbl_size, 1);
192CLUSTER_ATTR(dirtbl_size, 1);
193CLUSTER_ATTR(recover_timer, 1);
194CLUSTER_ATTR(toss_secs, 1);
195CLUSTER_ATTR(scan_secs, 1);
196CLUSTER_ATTR(log_debug, 0);
197CLUSTER_ATTR(protocol, 0);
198CLUSTER_ATTR(timewarn_cs, 1);
199CLUSTER_ATTR(waitwarn_us, 0);
200CLUSTER_ATTR(new_rsb_count, 0);
201CLUSTER_ATTR(recover_callbacks, 0);
202
203static struct configfs_attribute *cluster_attrs[] = {
204 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
205 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
206 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
207 [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr,
208 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
209 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
210 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
211 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
212 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
213 [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
214 [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr,
215 [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count.attr,
216 [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks.attr,
217 [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name.attr,
218 NULL,
219};
220
221enum {
222 COMM_ATTR_NODEID = 0,
223 COMM_ATTR_LOCAL,
224 COMM_ATTR_ADDR,
225 COMM_ATTR_ADDR_LIST,
226};
227
228struct comm_attribute {
229 struct configfs_attribute attr;
230 ssize_t (*show)(struct dlm_comm *, char *);
231 ssize_t (*store)(struct dlm_comm *, const char *, size_t);
232};
233
234static struct comm_attribute comm_attr_nodeid = {
235 .attr = { .ca_owner = THIS_MODULE,
236 .ca_name = "nodeid",
237 .ca_mode = S_IRUGO | S_IWUSR },
238 .show = comm_nodeid_read,
239 .store = comm_nodeid_write,
240};
241
242static struct comm_attribute comm_attr_local = {
243 .attr = { .ca_owner = THIS_MODULE,
244 .ca_name = "local",
245 .ca_mode = S_IRUGO | S_IWUSR },
246 .show = comm_local_read,
247 .store = comm_local_write,
248};
249
250static struct comm_attribute comm_attr_addr = {
251 .attr = { .ca_owner = THIS_MODULE,
252 .ca_name = "addr",
253 .ca_mode = S_IWUSR },
254 .store = comm_addr_write,
255};
256
257static struct comm_attribute comm_attr_addr_list = {
258 .attr = { .ca_owner = THIS_MODULE,
259 .ca_name = "addr_list",
260 .ca_mode = S_IRUGO },
261 .show = comm_addr_list_read,
262};
263
264static struct configfs_attribute *comm_attrs[] = {
265 [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
266 [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
267 [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
268 [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list.attr,
269 NULL,
270};
271
272enum {
273 NODE_ATTR_NODEID = 0,
274 NODE_ATTR_WEIGHT,
275};
276
277struct node_attribute {
278 struct configfs_attribute attr;
279 ssize_t (*show)(struct dlm_node *, char *);
280 ssize_t (*store)(struct dlm_node *, const char *, size_t);
281};
282
283static struct node_attribute node_attr_nodeid = {
284 .attr = { .ca_owner = THIS_MODULE,
285 .ca_name = "nodeid",
286 .ca_mode = S_IRUGO | S_IWUSR },
287 .show = node_nodeid_read,
288 .store = node_nodeid_write,
289};
290
291static struct node_attribute node_attr_weight = {
292 .attr = { .ca_owner = THIS_MODULE,
293 .ca_name = "weight",
294 .ca_mode = S_IRUGO | S_IWUSR },
295 .show = node_weight_read,
296 .store = node_weight_write,
297};
298
299static struct configfs_attribute *node_attrs[] = {
300 [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
301 [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
302 NULL,
303};
304
305struct dlm_clusters {
306 struct configfs_subsystem subsys;
307};
308
309struct dlm_spaces {
310 struct config_group ss_group;
311};
312
313struct dlm_space {
314 struct config_group group;
315 struct list_head members;
316 struct mutex members_lock;
317 int members_count;
318};
319
320struct dlm_comms {
321 struct config_group cs_group;
322};
323
324struct dlm_comm {
325 struct config_item item;
326 int seq;
327 int nodeid;
328 int local;
329 int addr_count;
330 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
331};
332
333struct dlm_nodes {
334 struct config_group ns_group;
335};
336
337struct dlm_node {
338 struct config_item item;
339 struct list_head list; /* space->members */
340 int nodeid;
341 int weight;
342 int new;
343 int comm_seq; /* copy of cm->seq when nd->nodeid is set */
344};
345
346static struct configfs_group_operations clusters_ops = {
347 .make_group = make_cluster,
348 .drop_item = drop_cluster,
349};
350
351static struct configfs_item_operations cluster_ops = {
352 .release = release_cluster,
353 .show_attribute = show_cluster,
354 .store_attribute = store_cluster,
355};
356
357static struct configfs_group_operations spaces_ops = {
358 .make_group = make_space,
359 .drop_item = drop_space,
360};
361
362static struct configfs_item_operations space_ops = {
363 .release = release_space,
364};
365
366static struct configfs_group_operations comms_ops = {
367 .make_item = make_comm,
368 .drop_item = drop_comm,
369};
370
371static struct configfs_item_operations comm_ops = {
372 .release = release_comm,
373 .show_attribute = show_comm,
374 .store_attribute = store_comm,
375};
376
377static struct configfs_group_operations nodes_ops = {
378 .make_item = make_node,
379 .drop_item = drop_node,
380};
381
382static struct configfs_item_operations node_ops = {
383 .release = release_node,
384 .show_attribute = show_node,
385 .store_attribute = store_node,
386};
387
388static struct config_item_type clusters_type = {
389 .ct_group_ops = &clusters_ops,
390 .ct_owner = THIS_MODULE,
391};
392
393static struct config_item_type cluster_type = {
394 .ct_item_ops = &cluster_ops,
395 .ct_attrs = cluster_attrs,
396 .ct_owner = THIS_MODULE,
397};
398
399static struct config_item_type spaces_type = {
400 .ct_group_ops = &spaces_ops,
401 .ct_owner = THIS_MODULE,
402};
403
404static struct config_item_type space_type = {
405 .ct_item_ops = &space_ops,
406 .ct_owner = THIS_MODULE,
407};
408
409static struct config_item_type comms_type = {
410 .ct_group_ops = &comms_ops,
411 .ct_owner = THIS_MODULE,
412};
413
414static struct config_item_type comm_type = {
415 .ct_item_ops = &comm_ops,
416 .ct_attrs = comm_attrs,
417 .ct_owner = THIS_MODULE,
418};
419
420static struct config_item_type nodes_type = {
421 .ct_group_ops = &nodes_ops,
422 .ct_owner = THIS_MODULE,
423};
424
425static struct config_item_type node_type = {
426 .ct_item_ops = &node_ops,
427 .ct_attrs = node_attrs,
428 .ct_owner = THIS_MODULE,
429};
430
431static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
432{
433 return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
434 NULL;
435}
436
437static struct dlm_space *config_item_to_space(struct config_item *i)
438{
439 return i ? container_of(to_config_group(i), struct dlm_space, group) :
440 NULL;
441}
442
443static struct dlm_comm *config_item_to_comm(struct config_item *i)
444{
445 return i ? container_of(i, struct dlm_comm, item) : NULL;
446}
447
448static struct dlm_node *config_item_to_node(struct config_item *i)
449{
450 return i ? container_of(i, struct dlm_node, item) : NULL;
451}
452
453static struct config_group *make_cluster(struct config_group *g,
454 const char *name)
455{
456 struct dlm_cluster *cl = NULL;
457 struct dlm_spaces *sps = NULL;
458 struct dlm_comms *cms = NULL;
459 void *gps = NULL;
460
461 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
462 gps = kcalloc(3, sizeof(struct config_group *), GFP_NOFS);
463 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
464 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
465
466 if (!cl || !gps || !sps || !cms)
467 goto fail;
468
469 config_group_init_type_name(&cl->group, name, &cluster_type);
470 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
471 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
472
473 cl->group.default_groups = gps;
474 cl->group.default_groups[0] = &sps->ss_group;
475 cl->group.default_groups[1] = &cms->cs_group;
476 cl->group.default_groups[2] = NULL;
477
478 cl->cl_tcp_port = dlm_config.ci_tcp_port;
479 cl->cl_buffer_size = dlm_config.ci_buffer_size;
480 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
481 cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
482 cl->cl_recover_timer = dlm_config.ci_recover_timer;
483 cl->cl_toss_secs = dlm_config.ci_toss_secs;
484 cl->cl_scan_secs = dlm_config.ci_scan_secs;
485 cl->cl_log_debug = dlm_config.ci_log_debug;
486 cl->cl_protocol = dlm_config.ci_protocol;
487 cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
488 cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
489 cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
490 cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
491 memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
492 DLM_LOCKSPACE_LEN);
493
494 space_list = &sps->ss_group;
495 comm_list = &cms->cs_group;
496 return &cl->group;
497
498 fail:
499 kfree(cl);
500 kfree(gps);
501 kfree(sps);
502 kfree(cms);
503 return ERR_PTR(-ENOMEM);
504}
505
506static void drop_cluster(struct config_group *g, struct config_item *i)
507{
508 struct dlm_cluster *cl = config_item_to_cluster(i);
509 struct config_item *tmp;
510 int j;
511
512 for (j = 0; cl->group.default_groups[j]; j++) {
513 tmp = &cl->group.default_groups[j]->cg_item;
514 cl->group.default_groups[j] = NULL;
515 config_item_put(tmp);
516 }
517
518 space_list = NULL;
519 comm_list = NULL;
520
521 config_item_put(i);
522}
523
524static void release_cluster(struct config_item *i)
525{
526 struct dlm_cluster *cl = config_item_to_cluster(i);
527 kfree(cl->group.default_groups);
528 kfree(cl);
529}
530
531static struct config_group *make_space(struct config_group *g, const char *name)
532{
533 struct dlm_space *sp = NULL;
534 struct dlm_nodes *nds = NULL;
535 void *gps = NULL;
536
537 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
538 gps = kcalloc(2, sizeof(struct config_group *), GFP_NOFS);
539 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
540
541 if (!sp || !gps || !nds)
542 goto fail;
543
544 config_group_init_type_name(&sp->group, name, &space_type);
545 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
546
547 sp->group.default_groups = gps;
548 sp->group.default_groups[0] = &nds->ns_group;
549 sp->group.default_groups[1] = NULL;
550
551 INIT_LIST_HEAD(&sp->members);
552 mutex_init(&sp->members_lock);
553 sp->members_count = 0;
554 return &sp->group;
555
556 fail:
557 kfree(sp);
558 kfree(gps);
559 kfree(nds);
560 return ERR_PTR(-ENOMEM);
561}
562
563static void drop_space(struct config_group *g, struct config_item *i)
564{
565 struct dlm_space *sp = config_item_to_space(i);
566 struct config_item *tmp;
567 int j;
568
569 /* assert list_empty(&sp->members) */
570
571 for (j = 0; sp->group.default_groups[j]; j++) {
572 tmp = &sp->group.default_groups[j]->cg_item;
573 sp->group.default_groups[j] = NULL;
574 config_item_put(tmp);
575 }
576
577 config_item_put(i);
578}
579
580static void release_space(struct config_item *i)
581{
582 struct dlm_space *sp = config_item_to_space(i);
583 kfree(sp->group.default_groups);
584 kfree(sp);
585}
586
587static struct config_item *make_comm(struct config_group *g, const char *name)
588{
589 struct dlm_comm *cm;
590
591 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
592 if (!cm)
593 return ERR_PTR(-ENOMEM);
594
595 config_item_init_type_name(&cm->item, name, &comm_type);
596
597 cm->seq = dlm_comm_count++;
598 if (!cm->seq)
599 cm->seq = dlm_comm_count++;
600
601 cm->nodeid = -1;
602 cm->local = 0;
603 cm->addr_count = 0;
604 return &cm->item;
605}
606
607static void drop_comm(struct config_group *g, struct config_item *i)
608{
609 struct dlm_comm *cm = config_item_to_comm(i);
610 if (local_comm == cm)
611 local_comm = NULL;
612 dlm_lowcomms_close(cm->nodeid);
613 while (cm->addr_count--)
614 kfree(cm->addr[cm->addr_count]);
615 config_item_put(i);
616}
617
618static void release_comm(struct config_item *i)
619{
620 struct dlm_comm *cm = config_item_to_comm(i);
621 kfree(cm);
622}
623
624static struct config_item *make_node(struct config_group *g, const char *name)
625{
626 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
627 struct dlm_node *nd;
628
629 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
630 if (!nd)
631 return ERR_PTR(-ENOMEM);
632
633 config_item_init_type_name(&nd->item, name, &node_type);
634 nd->nodeid = -1;
635 nd->weight = 1; /* default weight of 1 if none is set */
636 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
637
638 mutex_lock(&sp->members_lock);
639 list_add(&nd->list, &sp->members);
640 sp->members_count++;
641 mutex_unlock(&sp->members_lock);
642
643 return &nd->item;
644}
645
646static void drop_node(struct config_group *g, struct config_item *i)
647{
648 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
649 struct dlm_node *nd = config_item_to_node(i);
650
651 mutex_lock(&sp->members_lock);
652 list_del(&nd->list);
653 sp->members_count--;
654 mutex_unlock(&sp->members_lock);
655
656 config_item_put(i);
657}
658
659static void release_node(struct config_item *i)
660{
661 struct dlm_node *nd = config_item_to_node(i);
662 kfree(nd);
663}
664
665static struct dlm_clusters clusters_root = {
666 .subsys = {
667 .su_group = {
668 .cg_item = {
669 .ci_namebuf = "dlm",
670 .ci_type = &clusters_type,
671 },
672 },
673 },
674};
675
676int __init dlm_config_init(void)
677{
678 config_group_init(&clusters_root.subsys.su_group);
679 mutex_init(&clusters_root.subsys.su_mutex);
680 return configfs_register_subsystem(&clusters_root.subsys);
681}
682
683void dlm_config_exit(void)
684{
685 configfs_unregister_subsystem(&clusters_root.subsys);
686}
687
688/*
689 * Functions for user space to read/write attributes
690 */
691
692static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
693 char *buf)
694{
695 struct dlm_cluster *cl = config_item_to_cluster(i);
696 struct cluster_attribute *cla =
697 container_of(a, struct cluster_attribute, attr);
698 return cla->show ? cla->show(cl, buf) : 0;
699}
700
701static ssize_t store_cluster(struct config_item *i,
702 struct configfs_attribute *a,
703 const char *buf, size_t len)
704{
705 struct dlm_cluster *cl = config_item_to_cluster(i);
706 struct cluster_attribute *cla =
707 container_of(a, struct cluster_attribute, attr);
708 return cla->store ? cla->store(cl, buf, len) : -EINVAL;
709}
710
711static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
712 char *buf)
713{
714 struct dlm_comm *cm = config_item_to_comm(i);
715 struct comm_attribute *cma =
716 container_of(a, struct comm_attribute, attr);
717 return cma->show ? cma->show(cm, buf) : 0;
718}
719
720static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
721 const char *buf, size_t len)
722{
723 struct dlm_comm *cm = config_item_to_comm(i);
724 struct comm_attribute *cma =
725 container_of(a, struct comm_attribute, attr);
726 return cma->store ? cma->store(cm, buf, len) : -EINVAL;
727}
728
729static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf)
730{
731 return sprintf(buf, "%d\n", cm->nodeid);
732}
733
734static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
735 size_t len)
736{
737 cm->nodeid = simple_strtol(buf, NULL, 0);
738 return len;
739}
740
741static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
742{
743 return sprintf(buf, "%d\n", cm->local);
744}
745
746static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
747 size_t len)
748{
749 cm->local= simple_strtol(buf, NULL, 0);
750 if (cm->local && !local_comm)
751 local_comm = cm;
752 return len;
753}
754
755static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
756{
757 struct sockaddr_storage *addr;
758
759 if (len != sizeof(struct sockaddr_storage))
760 return -EINVAL;
761
762 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
763 return -ENOSPC;
764
765 addr = kzalloc(sizeof(*addr), GFP_NOFS);
766 if (!addr)
767 return -ENOMEM;
768
769 memcpy(addr, buf, len);
770 cm->addr[cm->addr_count++] = addr;
771 return len;
772}
773
774static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf)
775{
776 ssize_t s;
777 ssize_t allowance;
778 int i;
779 struct sockaddr_storage *addr;
780 struct sockaddr_in *addr_in;
781 struct sockaddr_in6 *addr_in6;
782
783 /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
784 char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
785
786
787 /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
788 allowance = 4096;
789 buf[0] = '\0';
790
791 for (i = 0; i < cm->addr_count; i++) {
792 addr = cm->addr[i];
793
794 switch(addr->ss_family) {
795 case AF_INET:
796 addr_in = (struct sockaddr_in *)addr;
797 s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr);
798 break;
799 case AF_INET6:
800 addr_in6 = (struct sockaddr_in6 *)addr;
801 s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr);
802 break;
803 default:
804 s = sprintf(buf0, "%s\n", "<UNKNOWN>");
805 break;
806 }
807 allowance -= s;
808 if (allowance >= 0)
809 strcat(buf, buf0);
810 else {
811 allowance += s;
812 break;
813 }
814 }
815 return 4096 - allowance;
816}
817
818static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
819 char *buf)
820{
821 struct dlm_node *nd = config_item_to_node(i);
822 struct node_attribute *nda =
823 container_of(a, struct node_attribute, attr);
824 return nda->show ? nda->show(nd, buf) : 0;
825}
826
827static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
828 const char *buf, size_t len)
829{
830 struct dlm_node *nd = config_item_to_node(i);
831 struct node_attribute *nda =
832 container_of(a, struct node_attribute, attr);
833 return nda->store ? nda->store(nd, buf, len) : -EINVAL;
834}
835
836static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
837{
838 return sprintf(buf, "%d\n", nd->nodeid);
839}
840
841static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
842 size_t len)
843{
844 uint32_t seq = 0;
845 nd->nodeid = simple_strtol(buf, NULL, 0);
846 dlm_comm_seq(nd->nodeid, &seq);
847 nd->comm_seq = seq;
848 return len;
849}
850
851static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
852{
853 return sprintf(buf, "%d\n", nd->weight);
854}
855
856static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
857 size_t len)
858{
859 nd->weight = simple_strtol(buf, NULL, 0);
860 return len;
861}
862
863/*
864 * Functions for the dlm to get the info that's been configured
865 */
866
867static struct dlm_space *get_space(char *name)
868{
869 struct config_item *i;
870
871 if (!space_list)
872 return NULL;
873
874 mutex_lock(&space_list->cg_subsys->su_mutex);
875 i = config_group_find_item(space_list, name);
876 mutex_unlock(&space_list->cg_subsys->su_mutex);
877
878 return config_item_to_space(i);
879}
880
881static void put_space(struct dlm_space *sp)
882{
883 config_item_put(&sp->group.cg_item);
884}
885
886static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y)
887{
888 switch (x->ss_family) {
889 case AF_INET: {
890 struct sockaddr_in *sinx = (struct sockaddr_in *)x;
891 struct sockaddr_in *siny = (struct sockaddr_in *)y;
892 if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr)
893 return 0;
894 if (sinx->sin_port != siny->sin_port)
895 return 0;
896 break;
897 }
898 case AF_INET6: {
899 struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x;
900 struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y;
901 if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr))
902 return 0;
903 if (sinx->sin6_port != siny->sin6_port)
904 return 0;
905 break;
906 }
907 default:
908 return 0;
909 }
910 return 1;
911}
912
913static struct dlm_comm *get_comm(int nodeid, struct sockaddr_storage *addr)
914{
915 struct config_item *i;
916 struct dlm_comm *cm = NULL;
917 int found = 0;
918
919 if (!comm_list)
920 return NULL;
921
922 mutex_lock(&clusters_root.subsys.su_mutex);
923
924 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
925 cm = config_item_to_comm(i);
926
927 if (nodeid) {
928 if (cm->nodeid != nodeid)
929 continue;
930 found = 1;
931 config_item_get(i);
932 break;
933 } else {
934 if (!cm->addr_count || !addr_compare(cm->addr[0], addr))
935 continue;
936 found = 1;
937 config_item_get(i);
938 break;
939 }
940 }
941 mutex_unlock(&clusters_root.subsys.su_mutex);
942
943 if (!found)
944 cm = NULL;
945 return cm;
946}
947
948static void put_comm(struct dlm_comm *cm)
949{
950 config_item_put(&cm->item);
951}
952
953/* caller must free mem */
954int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
955 int *count_out)
956{
957 struct dlm_space *sp;
958 struct dlm_node *nd;
959 struct dlm_config_node *nodes, *node;
960 int rv, count;
961
962 sp = get_space(lsname);
963 if (!sp)
964 return -EEXIST;
965
966 mutex_lock(&sp->members_lock);
967 if (!sp->members_count) {
968 rv = -EINVAL;
969 printk(KERN_ERR "dlm: zero members_count\n");
970 goto out;
971 }
972
973 count = sp->members_count;
974
975 nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
976 if (!nodes) {
977 rv = -ENOMEM;
978 goto out;
979 }
980
981 node = nodes;
982 list_for_each_entry(nd, &sp->members, list) {
983 node->nodeid = nd->nodeid;
984 node->weight = nd->weight;
985 node->new = nd->new;
986 node->comm_seq = nd->comm_seq;
987 node++;
988
989 nd->new = 0;
990 }
991
992 *count_out = count;
993 *nodes_out = nodes;
994 rv = 0;
995 out:
996 mutex_unlock(&sp->members_lock);
997 put_space(sp);
998 return rv;
999}
1000
1001int dlm_comm_seq(int nodeid, uint32_t *seq)
1002{
1003 struct dlm_comm *cm = get_comm(nodeid, NULL);
1004 if (!cm)
1005 return -EEXIST;
1006 *seq = cm->seq;
1007 put_comm(cm);
1008 return 0;
1009}
1010
1011int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
1012{
1013 struct dlm_comm *cm = get_comm(nodeid, NULL);
1014 if (!cm)
1015 return -EEXIST;
1016 if (!cm->addr_count)
1017 return -ENOENT;
1018 memcpy(addr, cm->addr[0], sizeof(*addr));
1019 put_comm(cm);
1020 return 0;
1021}
1022
1023int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
1024{
1025 struct dlm_comm *cm = get_comm(0, addr);
1026 if (!cm)
1027 return -EEXIST;
1028 *nodeid = cm->nodeid;
1029 put_comm(cm);
1030 return 0;
1031}
1032
1033int dlm_our_nodeid(void)
1034{
1035 return local_comm ? local_comm->nodeid : 0;
1036}
1037
1038/* num 0 is first addr, num 1 is second addr */
1039int dlm_our_addr(struct sockaddr_storage *addr, int num)
1040{
1041 if (!local_comm)
1042 return -1;
1043 if (num + 1 > local_comm->addr_count)
1044 return -1;
1045 memcpy(addr, local_comm->addr[num], sizeof(*addr));
1046 return 0;
1047}
1048
1049/* Config file defaults */
1050#define DEFAULT_TCP_PORT 21064
1051#define DEFAULT_BUFFER_SIZE 4096
1052#define DEFAULT_RSBTBL_SIZE 1024
1053#define DEFAULT_DIRTBL_SIZE 1024
1054#define DEFAULT_RECOVER_TIMER 5
1055#define DEFAULT_TOSS_SECS 10
1056#define DEFAULT_SCAN_SECS 5
1057#define DEFAULT_LOG_DEBUG 0
1058#define DEFAULT_PROTOCOL 0
1059#define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */
1060#define DEFAULT_WAITWARN_US 0
1061#define DEFAULT_NEW_RSB_COUNT 128
1062#define DEFAULT_RECOVER_CALLBACKS 0
1063#define DEFAULT_CLUSTER_NAME ""
1064
1065struct dlm_config_info dlm_config = {
1066 .ci_tcp_port = DEFAULT_TCP_PORT,
1067 .ci_buffer_size = DEFAULT_BUFFER_SIZE,
1068 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
1069 .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
1070 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
1071 .ci_toss_secs = DEFAULT_TOSS_SECS,
1072 .ci_scan_secs = DEFAULT_SCAN_SECS,
1073 .ci_log_debug = DEFAULT_LOG_DEBUG,
1074 .ci_protocol = DEFAULT_PROTOCOL,
1075 .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
1076 .ci_waitwarn_us = DEFAULT_WAITWARN_US,
1077 .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
1078 .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
1079 .ci_cluster_name = DEFAULT_CLUSTER_NAME
1080};
1081