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>/spaces/<space>/nodes/<node>/release_recover
30 * /config/dlm/<cluster>/comms/<comm>/nodeid (refers to <comm>)
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
37 static struct config_group *space_list;
38 static struct config_group *comm_list;
39 static struct dlm_comm *local_comm;
40 static uint32_t dlm_comm_count;
41
42 struct dlm_clusters;
43 struct dlm_cluster;
44 struct dlm_spaces;
45 struct dlm_space;
46 struct dlm_comms;
47 struct dlm_comm;
48 struct dlm_nodes;
49 struct dlm_node;
50
51 static struct config_group *make_cluster(struct config_group *, const char *);
52 static void drop_cluster(struct config_group *, struct config_item *);
53 static void release_cluster(struct config_item *);
54 static struct config_group *make_space(struct config_group *, const char *);
55 static void drop_space(struct config_group *, struct config_item *);
56 static void release_space(struct config_item *);
57 static struct config_item *make_comm(struct config_group *, const char *);
58 static void drop_comm(struct config_group *, struct config_item *);
59 static void release_comm(struct config_item *);
60 static struct config_item *make_node(struct config_group *, const char *);
61 static void drop_node(struct config_group *, struct config_item *);
62 static void release_node(struct config_item *);
63
64 static struct configfs_attribute *comm_attrs[];
65 static struct configfs_attribute *node_attrs[];
66
67 const struct rhashtable_params dlm_rhash_rsb_params = {
68 .nelem_hint = 3, /* start small */
69 .key_len = DLM_RESNAME_MAXLEN,
70 .key_offset = offsetof(struct dlm_rsb, res_name),
71 .head_offset = offsetof(struct dlm_rsb, res_node),
72 .automatic_shrinking = true,
73 };
74
75 struct dlm_cluster {
76 struct config_group group;
77 struct dlm_spaces *sps;
78 struct dlm_comms *cms;
79 };
80
config_item_to_cluster(struct config_item * i)81 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
82 {
83 return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
84 NULL;
85 }
86
87 enum {
88 CLUSTER_ATTR_TCP_PORT = 0,
89 CLUSTER_ATTR_BUFFER_SIZE,
90 CLUSTER_ATTR_RSBTBL_SIZE,
91 CLUSTER_ATTR_RECOVER_TIMER,
92 CLUSTER_ATTR_TOSS_SECS,
93 CLUSTER_ATTR_SCAN_SECS,
94 CLUSTER_ATTR_LOG_DEBUG,
95 CLUSTER_ATTR_LOG_INFO,
96 CLUSTER_ATTR_PROTOCOL,
97 CLUSTER_ATTR_MARK,
98 CLUSTER_ATTR_NEW_RSB_COUNT,
99 CLUSTER_ATTR_RECOVER_CALLBACKS,
100 CLUSTER_ATTR_CLUSTER_NAME,
101 };
102
cluster_cluster_name_show(struct config_item * item,char * buf)103 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
104 {
105 return sprintf(buf, "%s\n", dlm_config.ci_cluster_name);
106 }
107
cluster_cluster_name_store(struct config_item * item,const char * buf,size_t len)108 static ssize_t cluster_cluster_name_store(struct config_item *item,
109 const char *buf, size_t len)
110 {
111 strscpy(dlm_config.ci_cluster_name, buf,
112 sizeof(dlm_config.ci_cluster_name));
113 return len;
114 }
115
116 CONFIGFS_ATTR(cluster_, cluster_name);
117
cluster_tcp_port_show(struct config_item * item,char * buf)118 static ssize_t cluster_tcp_port_show(struct config_item *item, char *buf)
119 {
120 return sprintf(buf, "%u\n", be16_to_cpu(dlm_config.ci_tcp_port));
121 }
122
dlm_check_zero_and_dlm_running(unsigned int x)123 static int dlm_check_zero_and_dlm_running(unsigned int x)
124 {
125 if (!x)
126 return -EINVAL;
127
128 if (dlm_lowcomms_is_running())
129 return -EBUSY;
130
131 return 0;
132 }
133
cluster_tcp_port_store(struct config_item * item,const char * buf,size_t len)134 static ssize_t cluster_tcp_port_store(struct config_item *item,
135 const char *buf, size_t len)
136 {
137 int rc;
138 u16 x;
139
140 if (!capable(CAP_SYS_ADMIN))
141 return -EPERM;
142
143 rc = kstrtou16(buf, 0, &x);
144 if (rc)
145 return rc;
146
147 rc = dlm_check_zero_and_dlm_running(x);
148 if (rc)
149 return rc;
150
151 dlm_config.ci_tcp_port = cpu_to_be16(x);
152 return len;
153 }
154
155 CONFIGFS_ATTR(cluster_, tcp_port);
156
cluster_set(unsigned int * info_field,int (* check_cb)(unsigned int x),const char * buf,size_t len)157 static ssize_t cluster_set(unsigned int *info_field,
158 int (*check_cb)(unsigned int x),
159 const char *buf, size_t len)
160 {
161 unsigned int x;
162 int rc;
163
164 if (!capable(CAP_SYS_ADMIN))
165 return -EPERM;
166 rc = kstrtouint(buf, 0, &x);
167 if (rc)
168 return rc;
169
170 if (check_cb) {
171 rc = check_cb(x);
172 if (rc)
173 return rc;
174 }
175
176 *info_field = x;
177
178 return len;
179 }
180
181 #define CLUSTER_ATTR(name, check_cb) \
182 static ssize_t cluster_##name##_store(struct config_item *item, \
183 const char *buf, size_t len) \
184 { \
185 return cluster_set(&dlm_config.ci_##name, check_cb, buf, len); \
186 } \
187 static ssize_t cluster_##name##_show(struct config_item *item, char *buf) \
188 { \
189 return snprintf(buf, PAGE_SIZE, "%u\n", dlm_config.ci_##name); \
190 } \
191 CONFIGFS_ATTR(cluster_, name);
192
dlm_check_protocol_and_dlm_running(unsigned int x)193 static int dlm_check_protocol_and_dlm_running(unsigned int x)
194 {
195 switch (x) {
196 case 0:
197 /* TCP */
198 break;
199 case 1:
200 /* SCTP */
201 if (!IS_ENABLED(CONFIG_IP_SCTP))
202 return -EOPNOTSUPP;
203
204 break;
205 default:
206 return -EINVAL;
207 }
208
209 if (dlm_lowcomms_is_running())
210 return -EBUSY;
211
212 return 0;
213 }
214
dlm_check_zero(unsigned int x)215 static int dlm_check_zero(unsigned int x)
216 {
217 if (!x)
218 return -EINVAL;
219
220 return 0;
221 }
222
dlm_check_buffer_size(unsigned int x)223 static int dlm_check_buffer_size(unsigned int x)
224 {
225 if (x < DLM_MAX_SOCKET_BUFSIZE)
226 return -EINVAL;
227
228 return 0;
229 }
230
231 CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
232 CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
233 CLUSTER_ATTR(recover_timer, dlm_check_zero);
234 CLUSTER_ATTR(toss_secs, dlm_check_zero);
235 CLUSTER_ATTR(scan_secs, dlm_check_zero);
236 CLUSTER_ATTR(log_debug, NULL);
237 CLUSTER_ATTR(log_info, NULL);
238 CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
239 CLUSTER_ATTR(mark, NULL);
240 CLUSTER_ATTR(new_rsb_count, NULL);
241 CLUSTER_ATTR(recover_callbacks, NULL);
242
243 static struct configfs_attribute *cluster_attrs[] = {
244 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
245 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
246 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
247 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
248 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
249 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
250 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
251 [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
252 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
253 [CLUSTER_ATTR_MARK] = &cluster_attr_mark,
254 [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
255 [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
256 [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
257 NULL,
258 };
259
260 enum {
261 COMM_ATTR_NODEID = 0,
262 COMM_ATTR_LOCAL,
263 COMM_ATTR_ADDR,
264 COMM_ATTR_ADDR_LIST,
265 COMM_ATTR_MARK,
266 };
267
268 enum {
269 NODE_ATTR_NODEID = 0,
270 NODE_ATTR_WEIGHT,
271 NODE_ATTR_RELEASE_RECOVER,
272 };
273
274 struct dlm_clusters {
275 struct configfs_subsystem subsys;
276 };
277
278 struct dlm_spaces {
279 struct config_group ss_group;
280 };
281
282 struct dlm_space {
283 struct config_group group;
284 struct list_head members;
285 struct list_head members_gone;
286 int members_gone_count;
287 struct mutex members_lock;
288 int members_count;
289 struct dlm_nodes *nds;
290 };
291
292 struct dlm_comms {
293 struct config_group cs_group;
294 };
295
296 struct dlm_comm {
297 struct config_item item;
298 int seq;
299 int nodeid;
300 int local;
301 int addr_count;
302 unsigned int mark;
303 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
304 };
305
306 struct dlm_nodes {
307 struct config_group ns_group;
308 };
309
310 struct dlm_node {
311 struct config_item item;
312 struct list_head list; /* space->members */
313 int nodeid;
314 int weight;
315 int new;
316 int comm_seq; /* copy of cm->seq when nd->nodeid is set */
317 unsigned int release_recover;
318 };
319
320 struct dlm_member_gone {
321 int nodeid;
322 unsigned int release_recover;
323
324 struct list_head list; /* space->members_gone */
325 };
326
327 static struct configfs_group_operations clusters_ops = {
328 .make_group = make_cluster,
329 .drop_item = drop_cluster,
330 };
331
332 static struct configfs_item_operations cluster_ops = {
333 .release = release_cluster,
334 };
335
336 static struct configfs_group_operations spaces_ops = {
337 .make_group = make_space,
338 .drop_item = drop_space,
339 };
340
341 static struct configfs_item_operations space_ops = {
342 .release = release_space,
343 };
344
345 static struct configfs_group_operations comms_ops = {
346 .make_item = make_comm,
347 .drop_item = drop_comm,
348 };
349
350 static struct configfs_item_operations comm_ops = {
351 .release = release_comm,
352 };
353
354 static struct configfs_group_operations nodes_ops = {
355 .make_item = make_node,
356 .drop_item = drop_node,
357 };
358
359 static struct configfs_item_operations node_ops = {
360 .release = release_node,
361 };
362
363 static const struct config_item_type clusters_type = {
364 .ct_group_ops = &clusters_ops,
365 .ct_owner = THIS_MODULE,
366 };
367
368 static const struct config_item_type cluster_type = {
369 .ct_item_ops = &cluster_ops,
370 .ct_attrs = cluster_attrs,
371 .ct_owner = THIS_MODULE,
372 };
373
374 static const struct config_item_type spaces_type = {
375 .ct_group_ops = &spaces_ops,
376 .ct_owner = THIS_MODULE,
377 };
378
379 static const struct config_item_type space_type = {
380 .ct_item_ops = &space_ops,
381 .ct_owner = THIS_MODULE,
382 };
383
384 static const struct config_item_type comms_type = {
385 .ct_group_ops = &comms_ops,
386 .ct_owner = THIS_MODULE,
387 };
388
389 static const struct config_item_type comm_type = {
390 .ct_item_ops = &comm_ops,
391 .ct_attrs = comm_attrs,
392 .ct_owner = THIS_MODULE,
393 };
394
395 static const struct config_item_type nodes_type = {
396 .ct_group_ops = &nodes_ops,
397 .ct_owner = THIS_MODULE,
398 };
399
400 static const struct config_item_type node_type = {
401 .ct_item_ops = &node_ops,
402 .ct_attrs = node_attrs,
403 .ct_owner = THIS_MODULE,
404 };
405
config_item_to_space(struct config_item * i)406 static struct dlm_space *config_item_to_space(struct config_item *i)
407 {
408 return i ? container_of(to_config_group(i), struct dlm_space, group) :
409 NULL;
410 }
411
config_item_to_comm(struct config_item * i)412 static struct dlm_comm *config_item_to_comm(struct config_item *i)
413 {
414 return i ? container_of(i, struct dlm_comm, item) : NULL;
415 }
416
config_item_to_node(struct config_item * i)417 static struct dlm_node *config_item_to_node(struct config_item *i)
418 {
419 return i ? container_of(i, struct dlm_node, item) : NULL;
420 }
421
make_cluster(struct config_group * g,const char * name)422 static struct config_group *make_cluster(struct config_group *g,
423 const char *name)
424 {
425 struct dlm_cluster *cl = NULL;
426 struct dlm_spaces *sps = NULL;
427 struct dlm_comms *cms = NULL;
428
429 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
430 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
431 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
432
433 if (!cl || !sps || !cms)
434 goto fail;
435
436 cl->sps = sps;
437 cl->cms = cms;
438
439 config_group_init_type_name(&cl->group, name, &cluster_type);
440 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
441 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
442
443 configfs_add_default_group(&sps->ss_group, &cl->group);
444 configfs_add_default_group(&cms->cs_group, &cl->group);
445
446 space_list = &sps->ss_group;
447 comm_list = &cms->cs_group;
448 return &cl->group;
449
450 fail:
451 kfree(cl);
452 kfree(sps);
453 kfree(cms);
454 return ERR_PTR(-ENOMEM);
455 }
456
drop_cluster(struct config_group * g,struct config_item * i)457 static void drop_cluster(struct config_group *g, struct config_item *i)
458 {
459 struct dlm_cluster *cl = config_item_to_cluster(i);
460
461 configfs_remove_default_groups(&cl->group);
462
463 space_list = NULL;
464 comm_list = NULL;
465
466 config_item_put(i);
467 }
468
release_cluster(struct config_item * i)469 static void release_cluster(struct config_item *i)
470 {
471 struct dlm_cluster *cl = config_item_to_cluster(i);
472
473 kfree(cl->sps);
474 kfree(cl->cms);
475 kfree(cl);
476 }
477
make_space(struct config_group * g,const char * name)478 static struct config_group *make_space(struct config_group *g, const char *name)
479 {
480 struct dlm_space *sp = NULL;
481 struct dlm_nodes *nds = NULL;
482
483 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
484 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
485
486 if (!sp || !nds)
487 goto fail;
488
489 config_group_init_type_name(&sp->group, name, &space_type);
490
491 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
492 configfs_add_default_group(&nds->ns_group, &sp->group);
493
494 INIT_LIST_HEAD(&sp->members);
495 INIT_LIST_HEAD(&sp->members_gone);
496 mutex_init(&sp->members_lock);
497 sp->members_count = 0;
498 sp->nds = nds;
499 return &sp->group;
500
501 fail:
502 kfree(sp);
503 kfree(nds);
504 return ERR_PTR(-ENOMEM);
505 }
506
drop_space(struct config_group * g,struct config_item * i)507 static void drop_space(struct config_group *g, struct config_item *i)
508 {
509 struct dlm_space *sp = config_item_to_space(i);
510
511 /* assert list_empty(&sp->members) */
512
513 configfs_remove_default_groups(&sp->group);
514 config_item_put(i);
515 }
516
release_space(struct config_item * i)517 static void release_space(struct config_item *i)
518 {
519 struct dlm_space *sp = config_item_to_space(i);
520 kfree(sp->nds);
521 kfree(sp);
522 }
523
make_comm(struct config_group * g,const char * name)524 static struct config_item *make_comm(struct config_group *g, const char *name)
525 {
526 struct dlm_comm *cm;
527 unsigned int nodeid;
528 int rv;
529
530 rv = kstrtouint(name, 0, &nodeid);
531 if (rv)
532 return ERR_PTR(rv);
533
534 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
535 if (!cm)
536 return ERR_PTR(-ENOMEM);
537
538 config_item_init_type_name(&cm->item, name, &comm_type);
539
540 cm->seq = dlm_comm_count++;
541 if (!cm->seq)
542 cm->seq = dlm_comm_count++;
543
544 cm->nodeid = nodeid;
545 cm->local = 0;
546 cm->addr_count = 0;
547 cm->mark = 0;
548 return &cm->item;
549 }
550
drop_comm(struct config_group * g,struct config_item * i)551 static void drop_comm(struct config_group *g, struct config_item *i)
552 {
553 struct dlm_comm *cm = config_item_to_comm(i);
554 if (local_comm == cm)
555 local_comm = NULL;
556 dlm_midcomms_close(cm->nodeid);
557 while (cm->addr_count--)
558 kfree(cm->addr[cm->addr_count]);
559 config_item_put(i);
560 }
561
release_comm(struct config_item * i)562 static void release_comm(struct config_item *i)
563 {
564 struct dlm_comm *cm = config_item_to_comm(i);
565 kfree(cm);
566 }
567
make_node(struct config_group * g,const char * name)568 static struct config_item *make_node(struct config_group *g, const char *name)
569 {
570 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
571 unsigned int nodeid;
572 struct dlm_node *nd;
573 uint32_t seq = 0;
574 int rv;
575
576 rv = kstrtouint(name, 0, &nodeid);
577 if (rv)
578 return ERR_PTR(rv);
579
580 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
581 if (!nd)
582 return ERR_PTR(-ENOMEM);
583
584 config_item_init_type_name(&nd->item, name, &node_type);
585 nd->nodeid = nodeid;
586 nd->weight = 1; /* default weight of 1 if none is set */
587 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
588 dlm_comm_seq(nodeid, &seq, true);
589 nd->comm_seq = seq;
590
591 mutex_lock(&sp->members_lock);
592 list_add(&nd->list, &sp->members);
593 sp->members_count++;
594 mutex_unlock(&sp->members_lock);
595
596 return &nd->item;
597 }
598
drop_node(struct config_group * g,struct config_item * i)599 static void drop_node(struct config_group *g, struct config_item *i)
600 {
601 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
602 struct dlm_node *nd = config_item_to_node(i);
603 struct dlm_member_gone *mb_gone;
604
605 mb_gone = kzalloc(sizeof(*mb_gone), GFP_KERNEL);
606 if (!mb_gone)
607 return;
608
609 mutex_lock(&sp->members_lock);
610 list_del(&nd->list);
611 sp->members_count--;
612
613 mb_gone->nodeid = nd->nodeid;
614 mb_gone->release_recover = nd->release_recover;
615 list_add(&mb_gone->list, &sp->members_gone);
616 sp->members_gone_count++;
617 mutex_unlock(&sp->members_lock);
618
619 config_item_put(i);
620 }
621
release_node(struct config_item * i)622 static void release_node(struct config_item *i)
623 {
624 struct dlm_node *nd = config_item_to_node(i);
625 kfree(nd);
626 }
627
628 static struct dlm_clusters clusters_root = {
629 .subsys = {
630 .su_group = {
631 .cg_item = {
632 .ci_namebuf = "dlm",
633 .ci_type = &clusters_type,
634 },
635 },
636 },
637 };
638
dlm_config_init(void)639 int __init dlm_config_init(void)
640 {
641 config_group_init(&clusters_root.subsys.su_group);
642 mutex_init(&clusters_root.subsys.su_mutex);
643 return configfs_register_subsystem(&clusters_root.subsys);
644 }
645
dlm_config_exit(void)646 void dlm_config_exit(void)
647 {
648 configfs_unregister_subsystem(&clusters_root.subsys);
649 }
650
651 /*
652 * Functions for user space to read/write attributes
653 */
654
comm_nodeid_show(struct config_item * item,char * buf)655 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
656 {
657 unsigned int nodeid;
658 int rv;
659
660 rv = kstrtouint(config_item_name(item), 0, &nodeid);
661 if (WARN_ON(rv))
662 return rv;
663
664 return sprintf(buf, "%u\n", nodeid);
665 }
666
comm_nodeid_store(struct config_item * item,const char * buf,size_t len)667 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
668 size_t len)
669 {
670 return len;
671 }
672
comm_local_show(struct config_item * item,char * buf)673 static ssize_t comm_local_show(struct config_item *item, char *buf)
674 {
675 return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
676 }
677
comm_local_store(struct config_item * item,const char * buf,size_t len)678 static ssize_t comm_local_store(struct config_item *item, const char *buf,
679 size_t len)
680 {
681 struct dlm_comm *cm = config_item_to_comm(item);
682 int rc = kstrtoint(buf, 0, &cm->local);
683
684 if (rc)
685 return rc;
686 if (cm->local && !local_comm)
687 local_comm = cm;
688 return len;
689 }
690
comm_addr_store(struct config_item * item,const char * buf,size_t len)691 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
692 size_t len)
693 {
694 struct dlm_comm *cm = config_item_to_comm(item);
695 struct sockaddr_storage *addr;
696 int rv;
697
698 if (len != sizeof(struct sockaddr_storage))
699 return -EINVAL;
700
701 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
702 return -ENOSPC;
703
704 addr = kzalloc(sizeof(*addr), GFP_NOFS);
705 if (!addr)
706 return -ENOMEM;
707
708 memcpy(addr, buf, len);
709
710 rv = dlm_midcomms_addr(cm->nodeid, addr);
711 if (rv) {
712 kfree(addr);
713 return rv;
714 }
715
716 cm->addr[cm->addr_count++] = addr;
717 return len;
718 }
719
comm_addr_list_show(struct config_item * item,char * buf)720 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
721 {
722 struct dlm_comm *cm = config_item_to_comm(item);
723 ssize_t s;
724 ssize_t allowance;
725 int i;
726 struct sockaddr_storage *addr;
727 struct sockaddr_in *addr_in;
728 struct sockaddr_in6 *addr_in6;
729
730 /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
731 char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
732
733
734 /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
735 allowance = 4096;
736 buf[0] = '\0';
737
738 for (i = 0; i < cm->addr_count; i++) {
739 addr = cm->addr[i];
740
741 switch(addr->ss_family) {
742 case AF_INET:
743 addr_in = (struct sockaddr_in *)addr;
744 s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr);
745 break;
746 case AF_INET6:
747 addr_in6 = (struct sockaddr_in6 *)addr;
748 s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr);
749 break;
750 default:
751 s = sprintf(buf0, "%s\n", "<UNKNOWN>");
752 break;
753 }
754 allowance -= s;
755 if (allowance >= 0)
756 strcat(buf, buf0);
757 else {
758 allowance += s;
759 break;
760 }
761 }
762 return 4096 - allowance;
763 }
764
comm_mark_show(struct config_item * item,char * buf)765 static ssize_t comm_mark_show(struct config_item *item, char *buf)
766 {
767 return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
768 }
769
comm_mark_store(struct config_item * item,const char * buf,size_t len)770 static ssize_t comm_mark_store(struct config_item *item, const char *buf,
771 size_t len)
772 {
773 struct dlm_comm *comm;
774 unsigned int mark;
775 int rc;
776
777 rc = kstrtouint(buf, 0, &mark);
778 if (rc)
779 return rc;
780
781 if (mark == 0)
782 mark = dlm_config.ci_mark;
783
784 comm = config_item_to_comm(item);
785 rc = dlm_lowcomms_nodes_set_mark(comm->nodeid, mark);
786 if (rc)
787 return rc;
788
789 comm->mark = mark;
790 return len;
791 }
792
793 CONFIGFS_ATTR(comm_, nodeid);
794 CONFIGFS_ATTR(comm_, local);
795 CONFIGFS_ATTR(comm_, mark);
796 CONFIGFS_ATTR_WO(comm_, addr);
797 CONFIGFS_ATTR_RO(comm_, addr_list);
798
799 static struct configfs_attribute *comm_attrs[] = {
800 [COMM_ATTR_NODEID] = &comm_attr_nodeid,
801 [COMM_ATTR_LOCAL] = &comm_attr_local,
802 [COMM_ATTR_ADDR] = &comm_attr_addr,
803 [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
804 [COMM_ATTR_MARK] = &comm_attr_mark,
805 NULL,
806 };
807
node_nodeid_show(struct config_item * item,char * buf)808 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
809 {
810 unsigned int nodeid;
811 int rv;
812
813 rv = kstrtouint(config_item_name(item), 0, &nodeid);
814 if (WARN_ON(rv))
815 return rv;
816
817 return sprintf(buf, "%u\n", nodeid);
818 }
819
node_nodeid_store(struct config_item * item,const char * buf,size_t len)820 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
821 size_t len)
822 {
823 return len;
824 }
825
node_weight_show(struct config_item * item,char * buf)826 static ssize_t node_weight_show(struct config_item *item, char *buf)
827 {
828 return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
829 }
830
node_weight_store(struct config_item * item,const char * buf,size_t len)831 static ssize_t node_weight_store(struct config_item *item, const char *buf,
832 size_t len)
833 {
834 int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
835
836 if (rc)
837 return rc;
838 return len;
839 }
840
node_release_recover_show(struct config_item * item,char * buf)841 static ssize_t node_release_recover_show(struct config_item *item, char *buf)
842 {
843 struct dlm_node *n = config_item_to_node(item);
844
845 return sprintf(buf, "%u\n", n->release_recover);
846 }
847
node_release_recover_store(struct config_item * item,const char * buf,size_t len)848 static ssize_t node_release_recover_store(struct config_item *item,
849 const char *buf, size_t len)
850 {
851 struct dlm_node *n = config_item_to_node(item);
852 int rc;
853
854 rc = kstrtouint(buf, 0, &n->release_recover);
855 if (rc)
856 return rc;
857
858 return len;
859 }
860
861 CONFIGFS_ATTR(node_, nodeid);
862 CONFIGFS_ATTR(node_, weight);
863 CONFIGFS_ATTR(node_, release_recover);
864
865 static struct configfs_attribute *node_attrs[] = {
866 [NODE_ATTR_NODEID] = &node_attr_nodeid,
867 [NODE_ATTR_WEIGHT] = &node_attr_weight,
868 [NODE_ATTR_RELEASE_RECOVER] = &node_attr_release_recover,
869 NULL,
870 };
871
872 /*
873 * Functions for the dlm to get the info that's been configured
874 */
875
get_space(char * name)876 static struct dlm_space *get_space(char *name)
877 {
878 struct config_item *i;
879
880 if (!space_list)
881 return NULL;
882
883 mutex_lock(&space_list->cg_subsys->su_mutex);
884 i = config_group_find_item(space_list, name);
885 mutex_unlock(&space_list->cg_subsys->su_mutex);
886
887 return config_item_to_space(i);
888 }
889
put_space(struct dlm_space * sp)890 static void put_space(struct dlm_space *sp)
891 {
892 config_item_put(&sp->group.cg_item);
893 }
894
get_comm(int nodeid)895 static struct dlm_comm *get_comm(int nodeid)
896 {
897 struct config_item *i;
898 struct dlm_comm *cm = NULL;
899 int found = 0;
900
901 if (!comm_list)
902 return NULL;
903
904 WARN_ON_ONCE(!mutex_is_locked(&clusters_root.subsys.su_mutex));
905
906 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
907 cm = config_item_to_comm(i);
908
909 if (cm->nodeid != nodeid)
910 continue;
911 found = 1;
912 config_item_get(i);
913 break;
914 }
915
916 if (!found)
917 cm = NULL;
918 return cm;
919 }
920
put_comm(struct dlm_comm * cm)921 static void put_comm(struct dlm_comm *cm)
922 {
923 config_item_put(&cm->item);
924 }
925
926 /* caller must free mem */
dlm_config_nodes(char * lsname,struct dlm_config_node ** nodes_out,int * count_out)927 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
928 int *count_out)
929 {
930 struct dlm_member_gone *mb_gone, *mb_safe;
931 struct dlm_config_node *nodes, *node;
932 struct dlm_space *sp;
933 struct dlm_node *nd;
934 int rv, count;
935
936 sp = get_space(lsname);
937 if (!sp)
938 return -EEXIST;
939
940 mutex_lock(&sp->members_lock);
941 if (!sp->members_count) {
942 rv = -EINVAL;
943 printk(KERN_ERR "dlm: zero members_count\n");
944 goto out;
945 }
946
947 count = sp->members_count + sp->members_gone_count;
948
949 nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
950 if (!nodes) {
951 rv = -ENOMEM;
952 goto out;
953 }
954
955 node = nodes;
956 list_for_each_entry(nd, &sp->members, list) {
957 node->nodeid = nd->nodeid;
958 node->weight = nd->weight;
959 node->new = nd->new;
960 node->comm_seq = nd->comm_seq;
961 node++;
962
963 nd->new = 0;
964 }
965
966 /* we delay the remove on nodes until here as configfs does
967 * not support addtional attributes for rmdir().
968 */
969 list_for_each_entry_safe(mb_gone, mb_safe, &sp->members_gone, list) {
970 node->nodeid = mb_gone->nodeid;
971 node->release_recover = mb_gone->release_recover;
972 node->gone = true;
973 node++;
974
975 list_del(&mb_gone->list);
976 sp->members_gone_count--;
977 kfree(mb_gone);
978 }
979
980 *count_out = count;
981 *nodes_out = nodes;
982 rv = 0;
983 out:
984 mutex_unlock(&sp->members_lock);
985 put_space(sp);
986 return rv;
987 }
988
dlm_comm_seq(int nodeid,uint32_t * seq,bool locked)989 int dlm_comm_seq(int nodeid, uint32_t *seq, bool locked)
990 {
991 struct dlm_comm *cm;
992
993 if (locked) {
994 cm = get_comm(nodeid);
995 } else {
996 mutex_lock(&clusters_root.subsys.su_mutex);
997 cm = get_comm(nodeid);
998 mutex_unlock(&clusters_root.subsys.su_mutex);
999 }
1000 if (!cm)
1001 return -ENOENT;
1002
1003 *seq = cm->seq;
1004 put_comm(cm);
1005 return 0;
1006 }
1007
dlm_our_nodeid(void)1008 int dlm_our_nodeid(void)
1009 {
1010 return local_comm->nodeid;
1011 }
1012
1013 /* num 0 is first addr, num 1 is second addr */
dlm_our_addr(struct sockaddr_storage * addr,int num)1014 int dlm_our_addr(struct sockaddr_storage *addr, int num)
1015 {
1016 if (!local_comm)
1017 return -1;
1018 if (num + 1 > local_comm->addr_count)
1019 return -1;
1020 memcpy(addr, local_comm->addr[num], sizeof(*addr));
1021 return 0;
1022 }
1023
1024 /* Config file defaults */
1025 #define DEFAULT_TCP_PORT 21064
1026 #define DEFAULT_RSBTBL_SIZE 1024
1027 #define DEFAULT_RECOVER_TIMER 5
1028 #define DEFAULT_TOSS_SECS 10
1029 #define DEFAULT_SCAN_SECS 5
1030 #define DEFAULT_LOG_DEBUG 0
1031 #define DEFAULT_LOG_INFO 1
1032 #define DEFAULT_PROTOCOL DLM_PROTO_TCP
1033 #define DEFAULT_MARK 0
1034 #define DEFAULT_NEW_RSB_COUNT 128
1035 #define DEFAULT_RECOVER_CALLBACKS 0
1036 #define DEFAULT_CLUSTER_NAME ""
1037
1038 struct dlm_config_info dlm_config = {
1039 .ci_tcp_port = cpu_to_be16(DEFAULT_TCP_PORT),
1040 .ci_buffer_size = DLM_MAX_SOCKET_BUFSIZE,
1041 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
1042 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
1043 .ci_toss_secs = DEFAULT_TOSS_SECS,
1044 .ci_scan_secs = DEFAULT_SCAN_SECS,
1045 .ci_log_debug = DEFAULT_LOG_DEBUG,
1046 .ci_log_info = DEFAULT_LOG_INFO,
1047 .ci_protocol = DEFAULT_PROTOCOL,
1048 .ci_mark = DEFAULT_MARK,
1049 .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
1050 .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
1051 .ci_cluster_name = DEFAULT_CLUSTER_NAME
1052 };
1053
1054