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1// SPDX-License-Identifier: GPL-2.0-only
2/******************************************************************************
3*******************************************************************************
4**
5** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
6** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
7**
8**
9*******************************************************************************
10******************************************************************************/
11
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/configfs.h>
15#include <linux/slab.h>
16#include <linux/in.h>
17#include <linux/in6.h>
18#include <linux/dlmconstants.h>
19#include <net/ipv6.h>
20#include <net/sock.h>
21
22#include "config.h"
23#include "midcomms.h"
24#include "lowcomms.h"
25
26/*
27 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
28 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
29 * /config/dlm/<cluster>/comms/<comm>/nodeid
30 * /config/dlm/<cluster>/comms/<comm>/local
31 * /config/dlm/<cluster>/comms/<comm>/addr (write only)
32 * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
33 * The <cluster> level is useless, but I haven't figured out how to avoid it.
34 */
35
36static struct config_group *space_list;
37static struct config_group *comm_list;
38static struct dlm_comm *local_comm;
39static uint32_t dlm_comm_count;
40
41struct dlm_clusters;
42struct dlm_cluster;
43struct dlm_spaces;
44struct dlm_space;
45struct dlm_comms;
46struct dlm_comm;
47struct dlm_nodes;
48struct dlm_node;
49
50static struct config_group *make_cluster(struct config_group *, const char *);
51static void drop_cluster(struct config_group *, struct config_item *);
52static void release_cluster(struct config_item *);
53static struct config_group *make_space(struct config_group *, const char *);
54static void drop_space(struct config_group *, struct config_item *);
55static void release_space(struct config_item *);
56static struct config_item *make_comm(struct config_group *, const char *);
57static void drop_comm(struct config_group *, struct config_item *);
58static void release_comm(struct config_item *);
59static struct config_item *make_node(struct config_group *, const char *);
60static void drop_node(struct config_group *, struct config_item *);
61static void release_node(struct config_item *);
62
63static struct configfs_attribute *comm_attrs[];
64static struct configfs_attribute *node_attrs[];
65
66struct dlm_cluster {
67 struct config_group group;
68 unsigned int cl_tcp_port;
69 unsigned int cl_buffer_size;
70 unsigned int cl_rsbtbl_size;
71 unsigned int cl_recover_timer;
72 unsigned int cl_toss_secs;
73 unsigned int cl_scan_secs;
74 unsigned int cl_log_debug;
75 unsigned int cl_log_info;
76 unsigned int cl_protocol;
77 unsigned int cl_mark;
78 unsigned int cl_new_rsb_count;
79 unsigned int cl_recover_callbacks;
80 char cl_cluster_name[DLM_LOCKSPACE_LEN];
81
82 struct dlm_spaces *sps;
83 struct dlm_comms *cms;
84};
85
86static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
87{
88 return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
89 NULL;
90}
91
92enum {
93 CLUSTER_ATTR_TCP_PORT = 0,
94 CLUSTER_ATTR_BUFFER_SIZE,
95 CLUSTER_ATTR_RSBTBL_SIZE,
96 CLUSTER_ATTR_RECOVER_TIMER,
97 CLUSTER_ATTR_TOSS_SECS,
98 CLUSTER_ATTR_SCAN_SECS,
99 CLUSTER_ATTR_LOG_DEBUG,
100 CLUSTER_ATTR_LOG_INFO,
101 CLUSTER_ATTR_PROTOCOL,
102 CLUSTER_ATTR_MARK,
103 CLUSTER_ATTR_NEW_RSB_COUNT,
104 CLUSTER_ATTR_RECOVER_CALLBACKS,
105 CLUSTER_ATTR_CLUSTER_NAME,
106};
107
108static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
109{
110 struct dlm_cluster *cl = config_item_to_cluster(item);
111 return sprintf(buf, "%s\n", cl->cl_cluster_name);
112}
113
114static ssize_t cluster_cluster_name_store(struct config_item *item,
115 const char *buf, size_t len)
116{
117 struct dlm_cluster *cl = config_item_to_cluster(item);
118
119 strscpy(dlm_config.ci_cluster_name, buf,
120 sizeof(dlm_config.ci_cluster_name));
121 strscpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
122 return len;
123}
124
125CONFIGFS_ATTR(cluster_, cluster_name);
126
127static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
128 int *info_field, int (*check_cb)(unsigned int x),
129 const char *buf, size_t len)
130{
131 unsigned int x;
132 int rc;
133
134 if (!capable(CAP_SYS_ADMIN))
135 return -EPERM;
136 rc = kstrtouint(buf, 0, &x);
137 if (rc)
138 return rc;
139
140 if (check_cb) {
141 rc = check_cb(x);
142 if (rc)
143 return rc;
144 }
145
146 *cl_field = x;
147 *info_field = x;
148
149 return len;
150}
151
152#define CLUSTER_ATTR(name, check_cb) \
153static ssize_t cluster_##name##_store(struct config_item *item, \
154 const char *buf, size_t len) \
155{ \
156 struct dlm_cluster *cl = config_item_to_cluster(item); \
157 return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \
158 check_cb, buf, len); \
159} \
160static ssize_t cluster_##name##_show(struct config_item *item, char *buf) \
161{ \
162 struct dlm_cluster *cl = config_item_to_cluster(item); \
163 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
164} \
165CONFIGFS_ATTR(cluster_, name);
166
167static int dlm_check_protocol_and_dlm_running(unsigned int x)
168{
169 switch (x) {
170 case 0:
171 /* TCP */
172 break;
173 case 1:
174 /* SCTP */
175 break;
176 default:
177 return -EINVAL;
178 }
179
180 if (dlm_lowcomms_is_running())
181 return -EBUSY;
182
183 return 0;
184}
185
186static int dlm_check_zero_and_dlm_running(unsigned int x)
187{
188 if (!x)
189 return -EINVAL;
190
191 if (dlm_lowcomms_is_running())
192 return -EBUSY;
193
194 return 0;
195}
196
197static int dlm_check_zero(unsigned int x)
198{
199 if (!x)
200 return -EINVAL;
201
202 return 0;
203}
204
205static int dlm_check_buffer_size(unsigned int x)
206{
207 if (x < DLM_MAX_SOCKET_BUFSIZE)
208 return -EINVAL;
209
210 return 0;
211}
212
213CLUSTER_ATTR(tcp_port, dlm_check_zero_and_dlm_running);
214CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
215CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
216CLUSTER_ATTR(recover_timer, dlm_check_zero);
217CLUSTER_ATTR(toss_secs, dlm_check_zero);
218CLUSTER_ATTR(scan_secs, dlm_check_zero);
219CLUSTER_ATTR(log_debug, NULL);
220CLUSTER_ATTR(log_info, NULL);
221CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
222CLUSTER_ATTR(mark, NULL);
223CLUSTER_ATTR(new_rsb_count, NULL);
224CLUSTER_ATTR(recover_callbacks, NULL);
225
226static struct configfs_attribute *cluster_attrs[] = {
227 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
228 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
229 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
230 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
231 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
232 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
233 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
234 [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
235 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
236 [CLUSTER_ATTR_MARK] = &cluster_attr_mark,
237 [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
238 [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
239 [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
240 NULL,
241};
242
243enum {
244 COMM_ATTR_NODEID = 0,
245 COMM_ATTR_LOCAL,
246 COMM_ATTR_ADDR,
247 COMM_ATTR_ADDR_LIST,
248 COMM_ATTR_MARK,
249};
250
251enum {
252 NODE_ATTR_NODEID = 0,
253 NODE_ATTR_WEIGHT,
254};
255
256struct dlm_clusters {
257 struct configfs_subsystem subsys;
258};
259
260struct dlm_spaces {
261 struct config_group ss_group;
262};
263
264struct dlm_space {
265 struct config_group group;
266 struct list_head members;
267 struct mutex members_lock;
268 int members_count;
269 struct dlm_nodes *nds;
270};
271
272struct dlm_comms {
273 struct config_group cs_group;
274};
275
276struct dlm_comm {
277 struct config_item item;
278 int seq;
279 int nodeid;
280 int local;
281 int addr_count;
282 unsigned int mark;
283 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
284};
285
286struct dlm_nodes {
287 struct config_group ns_group;
288};
289
290struct dlm_node {
291 struct config_item item;
292 struct list_head list; /* space->members */
293 int nodeid;
294 int weight;
295 int new;
296 int comm_seq; /* copy of cm->seq when nd->nodeid is set */
297};
298
299static struct configfs_group_operations clusters_ops = {
300 .make_group = make_cluster,
301 .drop_item = drop_cluster,
302};
303
304static struct configfs_item_operations cluster_ops = {
305 .release = release_cluster,
306};
307
308static struct configfs_group_operations spaces_ops = {
309 .make_group = make_space,
310 .drop_item = drop_space,
311};
312
313static struct configfs_item_operations space_ops = {
314 .release = release_space,
315};
316
317static struct configfs_group_operations comms_ops = {
318 .make_item = make_comm,
319 .drop_item = drop_comm,
320};
321
322static struct configfs_item_operations comm_ops = {
323 .release = release_comm,
324};
325
326static struct configfs_group_operations nodes_ops = {
327 .make_item = make_node,
328 .drop_item = drop_node,
329};
330
331static struct configfs_item_operations node_ops = {
332 .release = release_node,
333};
334
335static const struct config_item_type clusters_type = {
336 .ct_group_ops = &clusters_ops,
337 .ct_owner = THIS_MODULE,
338};
339
340static const struct config_item_type cluster_type = {
341 .ct_item_ops = &cluster_ops,
342 .ct_attrs = cluster_attrs,
343 .ct_owner = THIS_MODULE,
344};
345
346static const struct config_item_type spaces_type = {
347 .ct_group_ops = &spaces_ops,
348 .ct_owner = THIS_MODULE,
349};
350
351static const struct config_item_type space_type = {
352 .ct_item_ops = &space_ops,
353 .ct_owner = THIS_MODULE,
354};
355
356static const struct config_item_type comms_type = {
357 .ct_group_ops = &comms_ops,
358 .ct_owner = THIS_MODULE,
359};
360
361static const struct config_item_type comm_type = {
362 .ct_item_ops = &comm_ops,
363 .ct_attrs = comm_attrs,
364 .ct_owner = THIS_MODULE,
365};
366
367static const struct config_item_type nodes_type = {
368 .ct_group_ops = &nodes_ops,
369 .ct_owner = THIS_MODULE,
370};
371
372static const struct config_item_type node_type = {
373 .ct_item_ops = &node_ops,
374 .ct_attrs = node_attrs,
375 .ct_owner = THIS_MODULE,
376};
377
378static struct dlm_space *config_item_to_space(struct config_item *i)
379{
380 return i ? container_of(to_config_group(i), struct dlm_space, group) :
381 NULL;
382}
383
384static struct dlm_comm *config_item_to_comm(struct config_item *i)
385{
386 return i ? container_of(i, struct dlm_comm, item) : NULL;
387}
388
389static struct dlm_node *config_item_to_node(struct config_item *i)
390{
391 return i ? container_of(i, struct dlm_node, item) : NULL;
392}
393
394static struct config_group *make_cluster(struct config_group *g,
395 const char *name)
396{
397 struct dlm_cluster *cl = NULL;
398 struct dlm_spaces *sps = NULL;
399 struct dlm_comms *cms = NULL;
400
401 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
402 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
403 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
404
405 if (!cl || !sps || !cms)
406 goto fail;
407
408 cl->sps = sps;
409 cl->cms = cms;
410
411 config_group_init_type_name(&cl->group, name, &cluster_type);
412 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
413 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
414
415 configfs_add_default_group(&sps->ss_group, &cl->group);
416 configfs_add_default_group(&cms->cs_group, &cl->group);
417
418 cl->cl_tcp_port = dlm_config.ci_tcp_port;
419 cl->cl_buffer_size = dlm_config.ci_buffer_size;
420 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
421 cl->cl_recover_timer = dlm_config.ci_recover_timer;
422 cl->cl_toss_secs = dlm_config.ci_toss_secs;
423 cl->cl_scan_secs = dlm_config.ci_scan_secs;
424 cl->cl_log_debug = dlm_config.ci_log_debug;
425 cl->cl_log_info = dlm_config.ci_log_info;
426 cl->cl_protocol = dlm_config.ci_protocol;
427 cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
428 cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
429 memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
430 DLM_LOCKSPACE_LEN);
431
432 space_list = &sps->ss_group;
433 comm_list = &cms->cs_group;
434 return &cl->group;
435
436 fail:
437 kfree(cl);
438 kfree(sps);
439 kfree(cms);
440 return ERR_PTR(-ENOMEM);
441}
442
443static void drop_cluster(struct config_group *g, struct config_item *i)
444{
445 struct dlm_cluster *cl = config_item_to_cluster(i);
446
447 configfs_remove_default_groups(&cl->group);
448
449 space_list = NULL;
450 comm_list = NULL;
451
452 config_item_put(i);
453}
454
455static void release_cluster(struct config_item *i)
456{
457 struct dlm_cluster *cl = config_item_to_cluster(i);
458
459 kfree(cl->sps);
460 kfree(cl->cms);
461 kfree(cl);
462}
463
464static struct config_group *make_space(struct config_group *g, const char *name)
465{
466 struct dlm_space *sp = NULL;
467 struct dlm_nodes *nds = NULL;
468
469 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
470 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
471
472 if (!sp || !nds)
473 goto fail;
474
475 config_group_init_type_name(&sp->group, name, &space_type);
476
477 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
478 configfs_add_default_group(&nds->ns_group, &sp->group);
479
480 INIT_LIST_HEAD(&sp->members);
481 mutex_init(&sp->members_lock);
482 sp->members_count = 0;
483 sp->nds = nds;
484 return &sp->group;
485
486 fail:
487 kfree(sp);
488 kfree(nds);
489 return ERR_PTR(-ENOMEM);
490}
491
492static void drop_space(struct config_group *g, struct config_item *i)
493{
494 struct dlm_space *sp = config_item_to_space(i);
495
496 /* assert list_empty(&sp->members) */
497
498 configfs_remove_default_groups(&sp->group);
499 config_item_put(i);
500}
501
502static void release_space(struct config_item *i)
503{
504 struct dlm_space *sp = config_item_to_space(i);
505 kfree(sp->nds);
506 kfree(sp);
507}
508
509static struct config_item *make_comm(struct config_group *g, const char *name)
510{
511 struct dlm_comm *cm;
512
513 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
514 if (!cm)
515 return ERR_PTR(-ENOMEM);
516
517 config_item_init_type_name(&cm->item, name, &comm_type);
518
519 cm->seq = dlm_comm_count++;
520 if (!cm->seq)
521 cm->seq = dlm_comm_count++;
522
523 cm->nodeid = -1;
524 cm->local = 0;
525 cm->addr_count = 0;
526 cm->mark = 0;
527 return &cm->item;
528}
529
530static void drop_comm(struct config_group *g, struct config_item *i)
531{
532 struct dlm_comm *cm = config_item_to_comm(i);
533 if (local_comm == cm)
534 local_comm = NULL;
535 dlm_midcomms_close(cm->nodeid);
536 while (cm->addr_count--)
537 kfree(cm->addr[cm->addr_count]);
538 config_item_put(i);
539}
540
541static void release_comm(struct config_item *i)
542{
543 struct dlm_comm *cm = config_item_to_comm(i);
544 kfree(cm);
545}
546
547static struct config_item *make_node(struct config_group *g, const char *name)
548{
549 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
550 struct dlm_node *nd;
551
552 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
553 if (!nd)
554 return ERR_PTR(-ENOMEM);
555
556 config_item_init_type_name(&nd->item, name, &node_type);
557 nd->nodeid = -1;
558 nd->weight = 1; /* default weight of 1 if none is set */
559 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
560
561 mutex_lock(&sp->members_lock);
562 list_add(&nd->list, &sp->members);
563 sp->members_count++;
564 mutex_unlock(&sp->members_lock);
565
566 return &nd->item;
567}
568
569static void drop_node(struct config_group *g, struct config_item *i)
570{
571 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
572 struct dlm_node *nd = config_item_to_node(i);
573
574 mutex_lock(&sp->members_lock);
575 list_del(&nd->list);
576 sp->members_count--;
577 mutex_unlock(&sp->members_lock);
578
579 config_item_put(i);
580}
581
582static void release_node(struct config_item *i)
583{
584 struct dlm_node *nd = config_item_to_node(i);
585 kfree(nd);
586}
587
588static struct dlm_clusters clusters_root = {
589 .subsys = {
590 .su_group = {
591 .cg_item = {
592 .ci_namebuf = "dlm",
593 .ci_type = &clusters_type,
594 },
595 },
596 },
597};
598
599int __init dlm_config_init(void)
600{
601 config_group_init(&clusters_root.subsys.su_group);
602 mutex_init(&clusters_root.subsys.su_mutex);
603 return configfs_register_subsystem(&clusters_root.subsys);
604}
605
606void dlm_config_exit(void)
607{
608 configfs_unregister_subsystem(&clusters_root.subsys);
609}
610
611/*
612 * Functions for user space to read/write attributes
613 */
614
615static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
616{
617 return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
618}
619
620static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
621 size_t len)
622{
623 int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
624
625 if (rc)
626 return rc;
627 return len;
628}
629
630static ssize_t comm_local_show(struct config_item *item, char *buf)
631{
632 return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
633}
634
635static ssize_t comm_local_store(struct config_item *item, const char *buf,
636 size_t len)
637{
638 struct dlm_comm *cm = config_item_to_comm(item);
639 int rc = kstrtoint(buf, 0, &cm->local);
640
641 if (rc)
642 return rc;
643 if (cm->local && !local_comm)
644 local_comm = cm;
645 return len;
646}
647
648static ssize_t comm_addr_store(struct config_item *item, const char *buf,
649 size_t len)
650{
651 struct dlm_comm *cm = config_item_to_comm(item);
652 struct sockaddr_storage *addr;
653 int rv;
654
655 if (len != sizeof(struct sockaddr_storage))
656 return -EINVAL;
657
658 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
659 return -ENOSPC;
660
661 addr = kzalloc(sizeof(*addr), GFP_NOFS);
662 if (!addr)
663 return -ENOMEM;
664
665 memcpy(addr, buf, len);
666
667 rv = dlm_midcomms_addr(cm->nodeid, addr, len);
668 if (rv) {
669 kfree(addr);
670 return rv;
671 }
672
673 cm->addr[cm->addr_count++] = addr;
674 return len;
675}
676
677static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
678{
679 struct dlm_comm *cm = config_item_to_comm(item);
680 ssize_t s;
681 ssize_t allowance;
682 int i;
683 struct sockaddr_storage *addr;
684 struct sockaddr_in *addr_in;
685 struct sockaddr_in6 *addr_in6;
686
687 /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
688 char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
689
690
691 /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
692 allowance = 4096;
693 buf[0] = '\0';
694
695 for (i = 0; i < cm->addr_count; i++) {
696 addr = cm->addr[i];
697
698 switch(addr->ss_family) {
699 case AF_INET:
700 addr_in = (struct sockaddr_in *)addr;
701 s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr);
702 break;
703 case AF_INET6:
704 addr_in6 = (struct sockaddr_in6 *)addr;
705 s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr);
706 break;
707 default:
708 s = sprintf(buf0, "%s\n", "<UNKNOWN>");
709 break;
710 }
711 allowance -= s;
712 if (allowance >= 0)
713 strcat(buf, buf0);
714 else {
715 allowance += s;
716 break;
717 }
718 }
719 return 4096 - allowance;
720}
721
722static ssize_t comm_mark_show(struct config_item *item, char *buf)
723{
724 return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
725}
726
727static ssize_t comm_mark_store(struct config_item *item, const char *buf,
728 size_t len)
729{
730 struct dlm_comm *comm;
731 unsigned int mark;
732 int rc;
733
734 rc = kstrtouint(buf, 0, &mark);
735 if (rc)
736 return rc;
737
738 if (mark == 0)
739 mark = dlm_config.ci_mark;
740
741 comm = config_item_to_comm(item);
742 rc = dlm_lowcomms_nodes_set_mark(comm->nodeid, mark);
743 if (rc)
744 return rc;
745
746 comm->mark = mark;
747 return len;
748}
749
750CONFIGFS_ATTR(comm_, nodeid);
751CONFIGFS_ATTR(comm_, local);
752CONFIGFS_ATTR(comm_, mark);
753CONFIGFS_ATTR_WO(comm_, addr);
754CONFIGFS_ATTR_RO(comm_, addr_list);
755
756static struct configfs_attribute *comm_attrs[] = {
757 [COMM_ATTR_NODEID] = &comm_attr_nodeid,
758 [COMM_ATTR_LOCAL] = &comm_attr_local,
759 [COMM_ATTR_ADDR] = &comm_attr_addr,
760 [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
761 [COMM_ATTR_MARK] = &comm_attr_mark,
762 NULL,
763};
764
765static ssize_t node_nodeid_show(struct config_item *item, char *buf)
766{
767 return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
768}
769
770static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
771 size_t len)
772{
773 struct dlm_node *nd = config_item_to_node(item);
774 uint32_t seq = 0;
775 int rc = kstrtoint(buf, 0, &nd->nodeid);
776
777 if (rc)
778 return rc;
779 dlm_comm_seq(nd->nodeid, &seq);
780 nd->comm_seq = seq;
781 return len;
782}
783
784static ssize_t node_weight_show(struct config_item *item, char *buf)
785{
786 return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
787}
788
789static ssize_t node_weight_store(struct config_item *item, const char *buf,
790 size_t len)
791{
792 int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
793
794 if (rc)
795 return rc;
796 return len;
797}
798
799CONFIGFS_ATTR(node_, nodeid);
800CONFIGFS_ATTR(node_, weight);
801
802static struct configfs_attribute *node_attrs[] = {
803 [NODE_ATTR_NODEID] = &node_attr_nodeid,
804 [NODE_ATTR_WEIGHT] = &node_attr_weight,
805 NULL,
806};
807
808/*
809 * Functions for the dlm to get the info that's been configured
810 */
811
812static struct dlm_space *get_space(char *name)
813{
814 struct config_item *i;
815
816 if (!space_list)
817 return NULL;
818
819 mutex_lock(&space_list->cg_subsys->su_mutex);
820 i = config_group_find_item(space_list, name);
821 mutex_unlock(&space_list->cg_subsys->su_mutex);
822
823 return config_item_to_space(i);
824}
825
826static void put_space(struct dlm_space *sp)
827{
828 config_item_put(&sp->group.cg_item);
829}
830
831static struct dlm_comm *get_comm(int nodeid)
832{
833 struct config_item *i;
834 struct dlm_comm *cm = NULL;
835 int found = 0;
836
837 if (!comm_list)
838 return NULL;
839
840 mutex_lock(&clusters_root.subsys.su_mutex);
841
842 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
843 cm = config_item_to_comm(i);
844
845 if (cm->nodeid != nodeid)
846 continue;
847 found = 1;
848 config_item_get(i);
849 break;
850 }
851 mutex_unlock(&clusters_root.subsys.su_mutex);
852
853 if (!found)
854 cm = NULL;
855 return cm;
856}
857
858static void put_comm(struct dlm_comm *cm)
859{
860 config_item_put(&cm->item);
861}
862
863/* caller must free mem */
864int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
865 int *count_out)
866{
867 struct dlm_space *sp;
868 struct dlm_node *nd;
869 struct dlm_config_node *nodes, *node;
870 int rv, count;
871
872 sp = get_space(lsname);
873 if (!sp)
874 return -EEXIST;
875
876 mutex_lock(&sp->members_lock);
877 if (!sp->members_count) {
878 rv = -EINVAL;
879 printk(KERN_ERR "dlm: zero members_count\n");
880 goto out;
881 }
882
883 count = sp->members_count;
884
885 nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
886 if (!nodes) {
887 rv = -ENOMEM;
888 goto out;
889 }
890
891 node = nodes;
892 list_for_each_entry(nd, &sp->members, list) {
893 node->nodeid = nd->nodeid;
894 node->weight = nd->weight;
895 node->new = nd->new;
896 node->comm_seq = nd->comm_seq;
897 node++;
898
899 nd->new = 0;
900 }
901
902 *count_out = count;
903 *nodes_out = nodes;
904 rv = 0;
905 out:
906 mutex_unlock(&sp->members_lock);
907 put_space(sp);
908 return rv;
909}
910
911int dlm_comm_seq(int nodeid, uint32_t *seq)
912{
913 struct dlm_comm *cm = get_comm(nodeid);
914 if (!cm)
915 return -EEXIST;
916 *seq = cm->seq;
917 put_comm(cm);
918 return 0;
919}
920
921int dlm_our_nodeid(void)
922{
923 return local_comm ? local_comm->nodeid : 0;
924}
925
926/* num 0 is first addr, num 1 is second addr */
927int dlm_our_addr(struct sockaddr_storage *addr, int num)
928{
929 if (!local_comm)
930 return -1;
931 if (num + 1 > local_comm->addr_count)
932 return -1;
933 memcpy(addr, local_comm->addr[num], sizeof(*addr));
934 return 0;
935}
936
937/* Config file defaults */
938#define DEFAULT_TCP_PORT 21064
939#define DEFAULT_RSBTBL_SIZE 1024
940#define DEFAULT_RECOVER_TIMER 5
941#define DEFAULT_TOSS_SECS 10
942#define DEFAULT_SCAN_SECS 5
943#define DEFAULT_LOG_DEBUG 0
944#define DEFAULT_LOG_INFO 1
945#define DEFAULT_PROTOCOL DLM_PROTO_TCP
946#define DEFAULT_MARK 0
947#define DEFAULT_NEW_RSB_COUNT 128
948#define DEFAULT_RECOVER_CALLBACKS 0
949#define DEFAULT_CLUSTER_NAME ""
950
951struct dlm_config_info dlm_config = {
952 .ci_tcp_port = DEFAULT_TCP_PORT,
953 .ci_buffer_size = DLM_MAX_SOCKET_BUFSIZE,
954 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
955 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
956 .ci_toss_secs = DEFAULT_TOSS_SECS,
957 .ci_scan_secs = DEFAULT_SCAN_SECS,
958 .ci_log_debug = DEFAULT_LOG_DEBUG,
959 .ci_log_info = DEFAULT_LOG_INFO,
960 .ci_protocol = DEFAULT_PROTOCOL,
961 .ci_mark = DEFAULT_MARK,
962 .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
963 .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
964 .ci_cluster_name = DEFAULT_CLUSTER_NAME
965};
966
1// SPDX-License-Identifier: GPL-2.0-only
2/******************************************************************************
3*******************************************************************************
4**
5** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
6** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
7**
8**
9*******************************************************************************
10******************************************************************************/
11
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/configfs.h>
15#include <linux/slab.h>
16#include <linux/in.h>
17#include <linux/in6.h>
18#include <linux/dlmconstants.h>
19#include <net/ipv6.h>
20#include <net/sock.h>
21
22#include "config.h"
23#include "midcomms.h"
24#include "lowcomms.h"
25
26/*
27 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid (refers to <node>)
28 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
29 * /config/dlm/<cluster>/comms/<comm>/nodeid (refers to <comm>)
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
66const struct rhashtable_params dlm_rhash_rsb_params = {
67 .nelem_hint = 3, /* start small */
68 .key_len = DLM_RESNAME_MAXLEN,
69 .key_offset = offsetof(struct dlm_rsb, res_name),
70 .head_offset = offsetof(struct dlm_rsb, res_node),
71 .automatic_shrinking = true,
72};
73
74struct dlm_cluster {
75 struct config_group group;
76 struct dlm_spaces *sps;
77 struct dlm_comms *cms;
78};
79
80static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
81{
82 return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
83 NULL;
84}
85
86enum {
87 CLUSTER_ATTR_TCP_PORT = 0,
88 CLUSTER_ATTR_BUFFER_SIZE,
89 CLUSTER_ATTR_RSBTBL_SIZE,
90 CLUSTER_ATTR_RECOVER_TIMER,
91 CLUSTER_ATTR_TOSS_SECS,
92 CLUSTER_ATTR_SCAN_SECS,
93 CLUSTER_ATTR_LOG_DEBUG,
94 CLUSTER_ATTR_LOG_INFO,
95 CLUSTER_ATTR_PROTOCOL,
96 CLUSTER_ATTR_MARK,
97 CLUSTER_ATTR_NEW_RSB_COUNT,
98 CLUSTER_ATTR_RECOVER_CALLBACKS,
99 CLUSTER_ATTR_CLUSTER_NAME,
100};
101
102static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
103{
104 return sprintf(buf, "%s\n", dlm_config.ci_cluster_name);
105}
106
107static ssize_t cluster_cluster_name_store(struct config_item *item,
108 const char *buf, size_t len)
109{
110 strscpy(dlm_config.ci_cluster_name, buf,
111 sizeof(dlm_config.ci_cluster_name));
112 return len;
113}
114
115CONFIGFS_ATTR(cluster_, cluster_name);
116
117static ssize_t cluster_tcp_port_show(struct config_item *item, char *buf)
118{
119 return sprintf(buf, "%u\n", be16_to_cpu(dlm_config.ci_tcp_port));
120}
121
122static int dlm_check_zero_and_dlm_running(unsigned int x)
123{
124 if (!x)
125 return -EINVAL;
126
127 if (dlm_lowcomms_is_running())
128 return -EBUSY;
129
130 return 0;
131}
132
133static ssize_t cluster_tcp_port_store(struct config_item *item,
134 const char *buf, size_t len)
135{
136 int rc;
137 u16 x;
138
139 if (!capable(CAP_SYS_ADMIN))
140 return -EPERM;
141
142 rc = kstrtou16(buf, 0, &x);
143 if (rc)
144 return rc;
145
146 rc = dlm_check_zero_and_dlm_running(x);
147 if (rc)
148 return rc;
149
150 dlm_config.ci_tcp_port = cpu_to_be16(x);
151 return len;
152}
153
154CONFIGFS_ATTR(cluster_, tcp_port);
155
156static ssize_t cluster_set(unsigned int *info_field,
157 int (*check_cb)(unsigned int x),
158 const char *buf, size_t len)
159{
160 unsigned int x;
161 int rc;
162
163 if (!capable(CAP_SYS_ADMIN))
164 return -EPERM;
165 rc = kstrtouint(buf, 0, &x);
166 if (rc)
167 return rc;
168
169 if (check_cb) {
170 rc = check_cb(x);
171 if (rc)
172 return rc;
173 }
174
175 *info_field = x;
176
177 return len;
178}
179
180#define CLUSTER_ATTR(name, check_cb) \
181static ssize_t cluster_##name##_store(struct config_item *item, \
182 const char *buf, size_t len) \
183{ \
184 return cluster_set(&dlm_config.ci_##name, check_cb, buf, len); \
185} \
186static ssize_t cluster_##name##_show(struct config_item *item, char *buf) \
187{ \
188 return snprintf(buf, PAGE_SIZE, "%u\n", dlm_config.ci_##name); \
189} \
190CONFIGFS_ATTR(cluster_, name);
191
192static int dlm_check_protocol_and_dlm_running(unsigned int x)
193{
194 switch (x) {
195 case 0:
196 /* TCP */
197 break;
198 case 1:
199 /* SCTP */
200 break;
201 default:
202 return -EINVAL;
203 }
204
205 if (dlm_lowcomms_is_running())
206 return -EBUSY;
207
208 return 0;
209}
210
211static int dlm_check_zero(unsigned int x)
212{
213 if (!x)
214 return -EINVAL;
215
216 return 0;
217}
218
219static int dlm_check_buffer_size(unsigned int x)
220{
221 if (x < DLM_MAX_SOCKET_BUFSIZE)
222 return -EINVAL;
223
224 return 0;
225}
226
227CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
228CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
229CLUSTER_ATTR(recover_timer, dlm_check_zero);
230CLUSTER_ATTR(toss_secs, dlm_check_zero);
231CLUSTER_ATTR(scan_secs, dlm_check_zero);
232CLUSTER_ATTR(log_debug, NULL);
233CLUSTER_ATTR(log_info, NULL);
234CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
235CLUSTER_ATTR(mark, NULL);
236CLUSTER_ATTR(new_rsb_count, NULL);
237CLUSTER_ATTR(recover_callbacks, NULL);
238
239static struct configfs_attribute *cluster_attrs[] = {
240 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
241 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
242 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
243 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
244 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
245 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
246 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
247 [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
248 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
249 [CLUSTER_ATTR_MARK] = &cluster_attr_mark,
250 [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
251 [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
252 [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
253 NULL,
254};
255
256enum {
257 COMM_ATTR_NODEID = 0,
258 COMM_ATTR_LOCAL,
259 COMM_ATTR_ADDR,
260 COMM_ATTR_ADDR_LIST,
261 COMM_ATTR_MARK,
262};
263
264enum {
265 NODE_ATTR_NODEID = 0,
266 NODE_ATTR_WEIGHT,
267};
268
269struct dlm_clusters {
270 struct configfs_subsystem subsys;
271};
272
273struct dlm_spaces {
274 struct config_group ss_group;
275};
276
277struct dlm_space {
278 struct config_group group;
279 struct list_head members;
280 struct mutex members_lock;
281 int members_count;
282 struct dlm_nodes *nds;
283};
284
285struct dlm_comms {
286 struct config_group cs_group;
287};
288
289struct dlm_comm {
290 struct config_item item;
291 int seq;
292 int nodeid;
293 int local;
294 int addr_count;
295 unsigned int mark;
296 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
297};
298
299struct dlm_nodes {
300 struct config_group ns_group;
301};
302
303struct dlm_node {
304 struct config_item item;
305 struct list_head list; /* space->members */
306 int nodeid;
307 int weight;
308 int new;
309 int comm_seq; /* copy of cm->seq when nd->nodeid is set */
310};
311
312static struct configfs_group_operations clusters_ops = {
313 .make_group = make_cluster,
314 .drop_item = drop_cluster,
315};
316
317static struct configfs_item_operations cluster_ops = {
318 .release = release_cluster,
319};
320
321static struct configfs_group_operations spaces_ops = {
322 .make_group = make_space,
323 .drop_item = drop_space,
324};
325
326static struct configfs_item_operations space_ops = {
327 .release = release_space,
328};
329
330static struct configfs_group_operations comms_ops = {
331 .make_item = make_comm,
332 .drop_item = drop_comm,
333};
334
335static struct configfs_item_operations comm_ops = {
336 .release = release_comm,
337};
338
339static struct configfs_group_operations nodes_ops = {
340 .make_item = make_node,
341 .drop_item = drop_node,
342};
343
344static struct configfs_item_operations node_ops = {
345 .release = release_node,
346};
347
348static const struct config_item_type clusters_type = {
349 .ct_group_ops = &clusters_ops,
350 .ct_owner = THIS_MODULE,
351};
352
353static const struct config_item_type cluster_type = {
354 .ct_item_ops = &cluster_ops,
355 .ct_attrs = cluster_attrs,
356 .ct_owner = THIS_MODULE,
357};
358
359static const struct config_item_type spaces_type = {
360 .ct_group_ops = &spaces_ops,
361 .ct_owner = THIS_MODULE,
362};
363
364static const struct config_item_type space_type = {
365 .ct_item_ops = &space_ops,
366 .ct_owner = THIS_MODULE,
367};
368
369static const struct config_item_type comms_type = {
370 .ct_group_ops = &comms_ops,
371 .ct_owner = THIS_MODULE,
372};
373
374static const struct config_item_type comm_type = {
375 .ct_item_ops = &comm_ops,
376 .ct_attrs = comm_attrs,
377 .ct_owner = THIS_MODULE,
378};
379
380static const struct config_item_type nodes_type = {
381 .ct_group_ops = &nodes_ops,
382 .ct_owner = THIS_MODULE,
383};
384
385static const struct config_item_type node_type = {
386 .ct_item_ops = &node_ops,
387 .ct_attrs = node_attrs,
388 .ct_owner = THIS_MODULE,
389};
390
391static struct dlm_space *config_item_to_space(struct config_item *i)
392{
393 return i ? container_of(to_config_group(i), struct dlm_space, group) :
394 NULL;
395}
396
397static struct dlm_comm *config_item_to_comm(struct config_item *i)
398{
399 return i ? container_of(i, struct dlm_comm, item) : NULL;
400}
401
402static struct dlm_node *config_item_to_node(struct config_item *i)
403{
404 return i ? container_of(i, struct dlm_node, item) : NULL;
405}
406
407static struct config_group *make_cluster(struct config_group *g,
408 const char *name)
409{
410 struct dlm_cluster *cl = NULL;
411 struct dlm_spaces *sps = NULL;
412 struct dlm_comms *cms = NULL;
413
414 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
415 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
416 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
417
418 if (!cl || !sps || !cms)
419 goto fail;
420
421 cl->sps = sps;
422 cl->cms = cms;
423
424 config_group_init_type_name(&cl->group, name, &cluster_type);
425 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
426 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
427
428 configfs_add_default_group(&sps->ss_group, &cl->group);
429 configfs_add_default_group(&cms->cs_group, &cl->group);
430
431 space_list = &sps->ss_group;
432 comm_list = &cms->cs_group;
433 return &cl->group;
434
435 fail:
436 kfree(cl);
437 kfree(sps);
438 kfree(cms);
439 return ERR_PTR(-ENOMEM);
440}
441
442static void drop_cluster(struct config_group *g, struct config_item *i)
443{
444 struct dlm_cluster *cl = config_item_to_cluster(i);
445
446 configfs_remove_default_groups(&cl->group);
447
448 space_list = NULL;
449 comm_list = NULL;
450
451 config_item_put(i);
452}
453
454static void release_cluster(struct config_item *i)
455{
456 struct dlm_cluster *cl = config_item_to_cluster(i);
457
458 kfree(cl->sps);
459 kfree(cl->cms);
460 kfree(cl);
461}
462
463static struct config_group *make_space(struct config_group *g, const char *name)
464{
465 struct dlm_space *sp = NULL;
466 struct dlm_nodes *nds = NULL;
467
468 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
469 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
470
471 if (!sp || !nds)
472 goto fail;
473
474 config_group_init_type_name(&sp->group, name, &space_type);
475
476 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
477 configfs_add_default_group(&nds->ns_group, &sp->group);
478
479 INIT_LIST_HEAD(&sp->members);
480 mutex_init(&sp->members_lock);
481 sp->members_count = 0;
482 sp->nds = nds;
483 return &sp->group;
484
485 fail:
486 kfree(sp);
487 kfree(nds);
488 return ERR_PTR(-ENOMEM);
489}
490
491static void drop_space(struct config_group *g, struct config_item *i)
492{
493 struct dlm_space *sp = config_item_to_space(i);
494
495 /* assert list_empty(&sp->members) */
496
497 configfs_remove_default_groups(&sp->group);
498 config_item_put(i);
499}
500
501static void release_space(struct config_item *i)
502{
503 struct dlm_space *sp = config_item_to_space(i);
504 kfree(sp->nds);
505 kfree(sp);
506}
507
508static struct config_item *make_comm(struct config_group *g, const char *name)
509{
510 struct dlm_comm *cm;
511 unsigned int nodeid;
512 int rv;
513
514 rv = kstrtouint(name, 0, &nodeid);
515 if (rv)
516 return ERR_PTR(rv);
517
518 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
519 if (!cm)
520 return ERR_PTR(-ENOMEM);
521
522 config_item_init_type_name(&cm->item, name, &comm_type);
523
524 cm->seq = dlm_comm_count++;
525 if (!cm->seq)
526 cm->seq = dlm_comm_count++;
527
528 cm->nodeid = nodeid;
529 cm->local = 0;
530 cm->addr_count = 0;
531 cm->mark = 0;
532 return &cm->item;
533}
534
535static void drop_comm(struct config_group *g, struct config_item *i)
536{
537 struct dlm_comm *cm = config_item_to_comm(i);
538 if (local_comm == cm)
539 local_comm = NULL;
540 dlm_midcomms_close(cm->nodeid);
541 while (cm->addr_count--)
542 kfree(cm->addr[cm->addr_count]);
543 config_item_put(i);
544}
545
546static void release_comm(struct config_item *i)
547{
548 struct dlm_comm *cm = config_item_to_comm(i);
549 kfree(cm);
550}
551
552static struct config_item *make_node(struct config_group *g, const char *name)
553{
554 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
555 unsigned int nodeid;
556 struct dlm_node *nd;
557 uint32_t seq = 0;
558 int rv;
559
560 rv = kstrtouint(name, 0, &nodeid);
561 if (rv)
562 return ERR_PTR(rv);
563
564 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
565 if (!nd)
566 return ERR_PTR(-ENOMEM);
567
568 config_item_init_type_name(&nd->item, name, &node_type);
569 nd->nodeid = nodeid;
570 nd->weight = 1; /* default weight of 1 if none is set */
571 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
572 dlm_comm_seq(nodeid, &seq, true);
573 nd->comm_seq = seq;
574
575 mutex_lock(&sp->members_lock);
576 list_add(&nd->list, &sp->members);
577 sp->members_count++;
578 mutex_unlock(&sp->members_lock);
579
580 return &nd->item;
581}
582
583static void drop_node(struct config_group *g, struct config_item *i)
584{
585 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
586 struct dlm_node *nd = config_item_to_node(i);
587
588 mutex_lock(&sp->members_lock);
589 list_del(&nd->list);
590 sp->members_count--;
591 mutex_unlock(&sp->members_lock);
592
593 config_item_put(i);
594}
595
596static void release_node(struct config_item *i)
597{
598 struct dlm_node *nd = config_item_to_node(i);
599 kfree(nd);
600}
601
602static struct dlm_clusters clusters_root = {
603 .subsys = {
604 .su_group = {
605 .cg_item = {
606 .ci_namebuf = "dlm",
607 .ci_type = &clusters_type,
608 },
609 },
610 },
611};
612
613int __init dlm_config_init(void)
614{
615 config_group_init(&clusters_root.subsys.su_group);
616 mutex_init(&clusters_root.subsys.su_mutex);
617 return configfs_register_subsystem(&clusters_root.subsys);
618}
619
620void dlm_config_exit(void)
621{
622 configfs_unregister_subsystem(&clusters_root.subsys);
623}
624
625/*
626 * Functions for user space to read/write attributes
627 */
628
629static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
630{
631 unsigned int nodeid;
632 int rv;
633
634 rv = kstrtouint(config_item_name(item), 0, &nodeid);
635 if (WARN_ON(rv))
636 return rv;
637
638 return sprintf(buf, "%u\n", nodeid);
639}
640
641static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
642 size_t len)
643{
644 return len;
645}
646
647static ssize_t comm_local_show(struct config_item *item, char *buf)
648{
649 return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
650}
651
652static ssize_t comm_local_store(struct config_item *item, const char *buf,
653 size_t len)
654{
655 struct dlm_comm *cm = config_item_to_comm(item);
656 int rc = kstrtoint(buf, 0, &cm->local);
657
658 if (rc)
659 return rc;
660 if (cm->local && !local_comm)
661 local_comm = cm;
662 return len;
663}
664
665static ssize_t comm_addr_store(struct config_item *item, const char *buf,
666 size_t len)
667{
668 struct dlm_comm *cm = config_item_to_comm(item);
669 struct sockaddr_storage *addr;
670 int rv;
671
672 if (len != sizeof(struct sockaddr_storage))
673 return -EINVAL;
674
675 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
676 return -ENOSPC;
677
678 addr = kzalloc(sizeof(*addr), GFP_NOFS);
679 if (!addr)
680 return -ENOMEM;
681
682 memcpy(addr, buf, len);
683
684 rv = dlm_midcomms_addr(cm->nodeid, addr);
685 if (rv) {
686 kfree(addr);
687 return rv;
688 }
689
690 cm->addr[cm->addr_count++] = addr;
691 return len;
692}
693
694static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
695{
696 struct dlm_comm *cm = config_item_to_comm(item);
697 ssize_t s;
698 ssize_t allowance;
699 int i;
700 struct sockaddr_storage *addr;
701 struct sockaddr_in *addr_in;
702 struct sockaddr_in6 *addr_in6;
703
704 /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
705 char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
706
707
708 /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
709 allowance = 4096;
710 buf[0] = '\0';
711
712 for (i = 0; i < cm->addr_count; i++) {
713 addr = cm->addr[i];
714
715 switch(addr->ss_family) {
716 case AF_INET:
717 addr_in = (struct sockaddr_in *)addr;
718 s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr);
719 break;
720 case AF_INET6:
721 addr_in6 = (struct sockaddr_in6 *)addr;
722 s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr);
723 break;
724 default:
725 s = sprintf(buf0, "%s\n", "<UNKNOWN>");
726 break;
727 }
728 allowance -= s;
729 if (allowance >= 0)
730 strcat(buf, buf0);
731 else {
732 allowance += s;
733 break;
734 }
735 }
736 return 4096 - allowance;
737}
738
739static ssize_t comm_mark_show(struct config_item *item, char *buf)
740{
741 return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
742}
743
744static ssize_t comm_mark_store(struct config_item *item, const char *buf,
745 size_t len)
746{
747 struct dlm_comm *comm;
748 unsigned int mark;
749 int rc;
750
751 rc = kstrtouint(buf, 0, &mark);
752 if (rc)
753 return rc;
754
755 if (mark == 0)
756 mark = dlm_config.ci_mark;
757
758 comm = config_item_to_comm(item);
759 rc = dlm_lowcomms_nodes_set_mark(comm->nodeid, mark);
760 if (rc)
761 return rc;
762
763 comm->mark = mark;
764 return len;
765}
766
767CONFIGFS_ATTR(comm_, nodeid);
768CONFIGFS_ATTR(comm_, local);
769CONFIGFS_ATTR(comm_, mark);
770CONFIGFS_ATTR_WO(comm_, addr);
771CONFIGFS_ATTR_RO(comm_, addr_list);
772
773static struct configfs_attribute *comm_attrs[] = {
774 [COMM_ATTR_NODEID] = &comm_attr_nodeid,
775 [COMM_ATTR_LOCAL] = &comm_attr_local,
776 [COMM_ATTR_ADDR] = &comm_attr_addr,
777 [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
778 [COMM_ATTR_MARK] = &comm_attr_mark,
779 NULL,
780};
781
782static ssize_t node_nodeid_show(struct config_item *item, char *buf)
783{
784 unsigned int nodeid;
785 int rv;
786
787 rv = kstrtouint(config_item_name(item), 0, &nodeid);
788 if (WARN_ON(rv))
789 return rv;
790
791 return sprintf(buf, "%u\n", nodeid);
792}
793
794static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
795 size_t len)
796{
797 return len;
798}
799
800static ssize_t node_weight_show(struct config_item *item, char *buf)
801{
802 return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
803}
804
805static ssize_t node_weight_store(struct config_item *item, const char *buf,
806 size_t len)
807{
808 int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
809
810 if (rc)
811 return rc;
812 return len;
813}
814
815CONFIGFS_ATTR(node_, nodeid);
816CONFIGFS_ATTR(node_, weight);
817
818static struct configfs_attribute *node_attrs[] = {
819 [NODE_ATTR_NODEID] = &node_attr_nodeid,
820 [NODE_ATTR_WEIGHT] = &node_attr_weight,
821 NULL,
822};
823
824/*
825 * Functions for the dlm to get the info that's been configured
826 */
827
828static struct dlm_space *get_space(char *name)
829{
830 struct config_item *i;
831
832 if (!space_list)
833 return NULL;
834
835 mutex_lock(&space_list->cg_subsys->su_mutex);
836 i = config_group_find_item(space_list, name);
837 mutex_unlock(&space_list->cg_subsys->su_mutex);
838
839 return config_item_to_space(i);
840}
841
842static void put_space(struct dlm_space *sp)
843{
844 config_item_put(&sp->group.cg_item);
845}
846
847static struct dlm_comm *get_comm(int nodeid)
848{
849 struct config_item *i;
850 struct dlm_comm *cm = NULL;
851 int found = 0;
852
853 if (!comm_list)
854 return NULL;
855
856 WARN_ON_ONCE(!mutex_is_locked(&clusters_root.subsys.su_mutex));
857
858 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
859 cm = config_item_to_comm(i);
860
861 if (cm->nodeid != nodeid)
862 continue;
863 found = 1;
864 config_item_get(i);
865 break;
866 }
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, bool locked)
927{
928 struct dlm_comm *cm;
929
930 if (locked) {
931 cm = get_comm(nodeid);
932 } else {
933 mutex_lock(&clusters_root.subsys.su_mutex);
934 cm = get_comm(nodeid);
935 mutex_unlock(&clusters_root.subsys.su_mutex);
936 }
937 if (!cm)
938 return -EEXIST;
939
940 *seq = cm->seq;
941 put_comm(cm);
942 return 0;
943}
944
945int dlm_our_nodeid(void)
946{
947 return local_comm->nodeid;
948}
949
950/* num 0 is first addr, num 1 is second addr */
951int dlm_our_addr(struct sockaddr_storage *addr, int num)
952{
953 if (!local_comm)
954 return -1;
955 if (num + 1 > local_comm->addr_count)
956 return -1;
957 memcpy(addr, local_comm->addr[num], sizeof(*addr));
958 return 0;
959}
960
961/* Config file defaults */
962#define DEFAULT_TCP_PORT 21064
963#define DEFAULT_RSBTBL_SIZE 1024
964#define DEFAULT_RECOVER_TIMER 5
965#define DEFAULT_TOSS_SECS 10
966#define DEFAULT_SCAN_SECS 5
967#define DEFAULT_LOG_DEBUG 0
968#define DEFAULT_LOG_INFO 1
969#define DEFAULT_PROTOCOL DLM_PROTO_TCP
970#define DEFAULT_MARK 0
971#define DEFAULT_NEW_RSB_COUNT 128
972#define DEFAULT_RECOVER_CALLBACKS 0
973#define DEFAULT_CLUSTER_NAME ""
974
975struct dlm_config_info dlm_config = {
976 .ci_tcp_port = cpu_to_be16(DEFAULT_TCP_PORT),
977 .ci_buffer_size = DLM_MAX_SOCKET_BUFSIZE,
978 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
979 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
980 .ci_toss_secs = DEFAULT_TOSS_SECS,
981 .ci_scan_secs = DEFAULT_SCAN_SECS,
982 .ci_log_debug = DEFAULT_LOG_DEBUG,
983 .ci_log_info = DEFAULT_LOG_INFO,
984 .ci_protocol = DEFAULT_PROTOCOL,
985 .ci_mark = DEFAULT_MARK,
986 .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
987 .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
988 .ci_cluster_name = DEFAULT_CLUSTER_NAME
989};
990