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