1 /******************************************************************************
2 *******************************************************************************
3 **
4 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5 ** Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
6 **
7 ** This copyrighted material is made available to anyone wishing to use,
8 ** modify, copy, or redistribute it subject to the terms and conditions
9 ** of the GNU General Public License v.2.
10 **
11 *******************************************************************************
12 ******************************************************************************/
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/configfs.h>
17 #include <linux/slab.h>
18 #include <linux/in.h>
19 #include <linux/in6.h>
20 #include <net/ipv6.h>
21 #include <net/sock.h>
22
23 #include "config.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
32 * The <cluster> level is useless, but I haven't figured out how to avoid it.
33 */
34
35 static struct config_group *space_list;
36 static struct config_group *comm_list;
37 static struct dlm_comm *local_comm;
38
39 struct dlm_clusters;
40 struct dlm_cluster;
41 struct dlm_spaces;
42 struct dlm_space;
43 struct dlm_comms;
44 struct dlm_comm;
45 struct dlm_nodes;
46 struct dlm_node;
47
48 static struct config_group *make_cluster(struct config_group *, const char *);
49 static void drop_cluster(struct config_group *, struct config_item *);
50 static void release_cluster(struct config_item *);
51 static struct config_group *make_space(struct config_group *, const char *);
52 static void drop_space(struct config_group *, struct config_item *);
53 static void release_space(struct config_item *);
54 static struct config_item *make_comm(struct config_group *, const char *);
55 static void drop_comm(struct config_group *, struct config_item *);
56 static void release_comm(struct config_item *);
57 static struct config_item *make_node(struct config_group *, const char *);
58 static void drop_node(struct config_group *, struct config_item *);
59 static void release_node(struct config_item *);
60
61 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
62 char *buf);
63 static ssize_t store_cluster(struct config_item *i,
64 struct configfs_attribute *a,
65 const char *buf, size_t len);
66 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
67 char *buf);
68 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
69 const char *buf, size_t len);
70 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
71 char *buf);
72 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
73 const char *buf, size_t len);
74
75 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf);
76 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
77 size_t len);
78 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf);
79 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
80 size_t len);
81 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf,
82 size_t len);
83 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf);
84 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
85 size_t len);
86 static ssize_t node_weight_read(struct dlm_node *nd, char *buf);
87 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
88 size_t len);
89
90 struct dlm_cluster {
91 struct config_group group;
92 unsigned int cl_tcp_port;
93 unsigned int cl_buffer_size;
94 unsigned int cl_rsbtbl_size;
95 unsigned int cl_lkbtbl_size;
96 unsigned int cl_dirtbl_size;
97 unsigned int cl_recover_timer;
98 unsigned int cl_toss_secs;
99 unsigned int cl_scan_secs;
100 unsigned int cl_log_debug;
101 unsigned int cl_protocol;
102 unsigned int cl_timewarn_cs;
103 };
104
105 enum {
106 CLUSTER_ATTR_TCP_PORT = 0,
107 CLUSTER_ATTR_BUFFER_SIZE,
108 CLUSTER_ATTR_RSBTBL_SIZE,
109 CLUSTER_ATTR_LKBTBL_SIZE,
110 CLUSTER_ATTR_DIRTBL_SIZE,
111 CLUSTER_ATTR_RECOVER_TIMER,
112 CLUSTER_ATTR_TOSS_SECS,
113 CLUSTER_ATTR_SCAN_SECS,
114 CLUSTER_ATTR_LOG_DEBUG,
115 CLUSTER_ATTR_PROTOCOL,
116 CLUSTER_ATTR_TIMEWARN_CS,
117 };
118
119 struct cluster_attribute {
120 struct configfs_attribute attr;
121 ssize_t (*show)(struct dlm_cluster *, char *);
122 ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
123 };
124
cluster_set(struct dlm_cluster * cl,unsigned int * cl_field,int * info_field,int check_zero,const char * buf,size_t len)125 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
126 int *info_field, int check_zero,
127 const char *buf, size_t len)
128 {
129 unsigned int x;
130
131 if (!capable(CAP_SYS_ADMIN))
132 return -EACCES;
133
134 x = simple_strtoul(buf, NULL, 0);
135
136 if (check_zero && !x)
137 return -EINVAL;
138
139 *cl_field = x;
140 *info_field = x;
141
142 return len;
143 }
144
145 #define CLUSTER_ATTR(name, check_zero) \
146 static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
147 { \
148 return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \
149 check_zero, buf, len); \
150 } \
151 static ssize_t name##_read(struct dlm_cluster *cl, char *buf) \
152 { \
153 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
154 } \
155 static struct cluster_attribute cluster_attr_##name = \
156 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
157
158 CLUSTER_ATTR(tcp_port, 1);
159 CLUSTER_ATTR(buffer_size, 1);
160 CLUSTER_ATTR(rsbtbl_size, 1);
161 CLUSTER_ATTR(lkbtbl_size, 1);
162 CLUSTER_ATTR(dirtbl_size, 1);
163 CLUSTER_ATTR(recover_timer, 1);
164 CLUSTER_ATTR(toss_secs, 1);
165 CLUSTER_ATTR(scan_secs, 1);
166 CLUSTER_ATTR(log_debug, 0);
167 CLUSTER_ATTR(protocol, 0);
168 CLUSTER_ATTR(timewarn_cs, 1);
169
170 static struct configfs_attribute *cluster_attrs[] = {
171 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
172 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
173 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
174 [CLUSTER_ATTR_LKBTBL_SIZE] = &cluster_attr_lkbtbl_size.attr,
175 [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr,
176 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
177 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
178 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
179 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
180 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
181 [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
182 NULL,
183 };
184
185 enum {
186 COMM_ATTR_NODEID = 0,
187 COMM_ATTR_LOCAL,
188 COMM_ATTR_ADDR,
189 };
190
191 struct comm_attribute {
192 struct configfs_attribute attr;
193 ssize_t (*show)(struct dlm_comm *, char *);
194 ssize_t (*store)(struct dlm_comm *, const char *, size_t);
195 };
196
197 static struct comm_attribute comm_attr_nodeid = {
198 .attr = { .ca_owner = THIS_MODULE,
199 .ca_name = "nodeid",
200 .ca_mode = S_IRUGO | S_IWUSR },
201 .show = comm_nodeid_read,
202 .store = comm_nodeid_write,
203 };
204
205 static struct comm_attribute comm_attr_local = {
206 .attr = { .ca_owner = THIS_MODULE,
207 .ca_name = "local",
208 .ca_mode = S_IRUGO | S_IWUSR },
209 .show = comm_local_read,
210 .store = comm_local_write,
211 };
212
213 static struct comm_attribute comm_attr_addr = {
214 .attr = { .ca_owner = THIS_MODULE,
215 .ca_name = "addr",
216 .ca_mode = S_IRUGO | S_IWUSR },
217 .store = comm_addr_write,
218 };
219
220 static struct configfs_attribute *comm_attrs[] = {
221 [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
222 [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
223 [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
224 NULL,
225 };
226
227 enum {
228 NODE_ATTR_NODEID = 0,
229 NODE_ATTR_WEIGHT,
230 };
231
232 struct node_attribute {
233 struct configfs_attribute attr;
234 ssize_t (*show)(struct dlm_node *, char *);
235 ssize_t (*store)(struct dlm_node *, const char *, size_t);
236 };
237
238 static struct node_attribute node_attr_nodeid = {
239 .attr = { .ca_owner = THIS_MODULE,
240 .ca_name = "nodeid",
241 .ca_mode = S_IRUGO | S_IWUSR },
242 .show = node_nodeid_read,
243 .store = node_nodeid_write,
244 };
245
246 static struct node_attribute node_attr_weight = {
247 .attr = { .ca_owner = THIS_MODULE,
248 .ca_name = "weight",
249 .ca_mode = S_IRUGO | S_IWUSR },
250 .show = node_weight_read,
251 .store = node_weight_write,
252 };
253
254 static struct configfs_attribute *node_attrs[] = {
255 [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
256 [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
257 NULL,
258 };
259
260 struct dlm_clusters {
261 struct configfs_subsystem subsys;
262 };
263
264 struct dlm_spaces {
265 struct config_group ss_group;
266 };
267
268 struct dlm_space {
269 struct config_group group;
270 struct list_head members;
271 struct mutex members_lock;
272 int members_count;
273 };
274
275 struct dlm_comms {
276 struct config_group cs_group;
277 };
278
279 struct dlm_comm {
280 struct config_item item;
281 int nodeid;
282 int local;
283 int addr_count;
284 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
285 };
286
287 struct dlm_nodes {
288 struct config_group ns_group;
289 };
290
291 struct dlm_node {
292 struct config_item item;
293 struct list_head list; /* space->members */
294 int nodeid;
295 int weight;
296 int new;
297 };
298
299 static struct configfs_group_operations clusters_ops = {
300 .make_group = make_cluster,
301 .drop_item = drop_cluster,
302 };
303
304 static struct configfs_item_operations cluster_ops = {
305 .release = release_cluster,
306 .show_attribute = show_cluster,
307 .store_attribute = store_cluster,
308 };
309
310 static struct configfs_group_operations spaces_ops = {
311 .make_group = make_space,
312 .drop_item = drop_space,
313 };
314
315 static struct configfs_item_operations space_ops = {
316 .release = release_space,
317 };
318
319 static struct configfs_group_operations comms_ops = {
320 .make_item = make_comm,
321 .drop_item = drop_comm,
322 };
323
324 static struct configfs_item_operations comm_ops = {
325 .release = release_comm,
326 .show_attribute = show_comm,
327 .store_attribute = store_comm,
328 };
329
330 static struct configfs_group_operations nodes_ops = {
331 .make_item = make_node,
332 .drop_item = drop_node,
333 };
334
335 static struct configfs_item_operations node_ops = {
336 .release = release_node,
337 .show_attribute = show_node,
338 .store_attribute = store_node,
339 };
340
341 static struct config_item_type clusters_type = {
342 .ct_group_ops = &clusters_ops,
343 .ct_owner = THIS_MODULE,
344 };
345
346 static struct config_item_type cluster_type = {
347 .ct_item_ops = &cluster_ops,
348 .ct_attrs = cluster_attrs,
349 .ct_owner = THIS_MODULE,
350 };
351
352 static struct config_item_type spaces_type = {
353 .ct_group_ops = &spaces_ops,
354 .ct_owner = THIS_MODULE,
355 };
356
357 static struct config_item_type space_type = {
358 .ct_item_ops = &space_ops,
359 .ct_owner = THIS_MODULE,
360 };
361
362 static struct config_item_type comms_type = {
363 .ct_group_ops = &comms_ops,
364 .ct_owner = THIS_MODULE,
365 };
366
367 static struct config_item_type comm_type = {
368 .ct_item_ops = &comm_ops,
369 .ct_attrs = comm_attrs,
370 .ct_owner = THIS_MODULE,
371 };
372
373 static struct config_item_type nodes_type = {
374 .ct_group_ops = &nodes_ops,
375 .ct_owner = THIS_MODULE,
376 };
377
378 static struct config_item_type node_type = {
379 .ct_item_ops = &node_ops,
380 .ct_attrs = node_attrs,
381 .ct_owner = THIS_MODULE,
382 };
383
config_item_to_cluster(struct config_item * i)384 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
385 {
386 return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
387 NULL;
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 void *gps = NULL;
413
414 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
415 gps = kcalloc(3, sizeof(struct config_group *), GFP_NOFS);
416 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
417 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
418
419 if (!cl || !gps || !sps || !cms)
420 goto fail;
421
422 config_group_init_type_name(&cl->group, name, &cluster_type);
423 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
424 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
425
426 cl->group.default_groups = gps;
427 cl->group.default_groups[0] = &sps->ss_group;
428 cl->group.default_groups[1] = &cms->cs_group;
429 cl->group.default_groups[2] = NULL;
430
431 cl->cl_tcp_port = dlm_config.ci_tcp_port;
432 cl->cl_buffer_size = dlm_config.ci_buffer_size;
433 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
434 cl->cl_lkbtbl_size = dlm_config.ci_lkbtbl_size;
435 cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
436 cl->cl_recover_timer = dlm_config.ci_recover_timer;
437 cl->cl_toss_secs = dlm_config.ci_toss_secs;
438 cl->cl_scan_secs = dlm_config.ci_scan_secs;
439 cl->cl_log_debug = dlm_config.ci_log_debug;
440 cl->cl_protocol = dlm_config.ci_protocol;
441 cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
442
443 space_list = &sps->ss_group;
444 comm_list = &cms->cs_group;
445 return &cl->group;
446
447 fail:
448 kfree(cl);
449 kfree(gps);
450 kfree(sps);
451 kfree(cms);
452 return ERR_PTR(-ENOMEM);
453 }
454
drop_cluster(struct config_group * g,struct config_item * i)455 static void drop_cluster(struct config_group *g, struct config_item *i)
456 {
457 struct dlm_cluster *cl = config_item_to_cluster(i);
458 struct config_item *tmp;
459 int j;
460
461 for (j = 0; cl->group.default_groups[j]; j++) {
462 tmp = &cl->group.default_groups[j]->cg_item;
463 cl->group.default_groups[j] = NULL;
464 config_item_put(tmp);
465 }
466
467 space_list = NULL;
468 comm_list = NULL;
469
470 config_item_put(i);
471 }
472
release_cluster(struct config_item * i)473 static void release_cluster(struct config_item *i)
474 {
475 struct dlm_cluster *cl = config_item_to_cluster(i);
476 kfree(cl->group.default_groups);
477 kfree(cl);
478 }
479
make_space(struct config_group * g,const char * name)480 static struct config_group *make_space(struct config_group *g, const char *name)
481 {
482 struct dlm_space *sp = NULL;
483 struct dlm_nodes *nds = NULL;
484 void *gps = NULL;
485
486 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
487 gps = kcalloc(2, sizeof(struct config_group *), GFP_NOFS);
488 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
489
490 if (!sp || !gps || !nds)
491 goto fail;
492
493 config_group_init_type_name(&sp->group, name, &space_type);
494 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
495
496 sp->group.default_groups = gps;
497 sp->group.default_groups[0] = &nds->ns_group;
498 sp->group.default_groups[1] = NULL;
499
500 INIT_LIST_HEAD(&sp->members);
501 mutex_init(&sp->members_lock);
502 sp->members_count = 0;
503 return &sp->group;
504
505 fail:
506 kfree(sp);
507 kfree(gps);
508 kfree(nds);
509 return ERR_PTR(-ENOMEM);
510 }
511
drop_space(struct config_group * g,struct config_item * i)512 static void drop_space(struct config_group *g, struct config_item *i)
513 {
514 struct dlm_space *sp = config_item_to_space(i);
515 struct config_item *tmp;
516 int j;
517
518 /* assert list_empty(&sp->members) */
519
520 for (j = 0; sp->group.default_groups[j]; j++) {
521 tmp = &sp->group.default_groups[j]->cg_item;
522 sp->group.default_groups[j] = NULL;
523 config_item_put(tmp);
524 }
525
526 config_item_put(i);
527 }
528
release_space(struct config_item * i)529 static void release_space(struct config_item *i)
530 {
531 struct dlm_space *sp = config_item_to_space(i);
532 kfree(sp->group.default_groups);
533 kfree(sp);
534 }
535
make_comm(struct config_group * g,const char * name)536 static struct config_item *make_comm(struct config_group *g, const char *name)
537 {
538 struct dlm_comm *cm;
539
540 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
541 if (!cm)
542 return ERR_PTR(-ENOMEM);
543
544 config_item_init_type_name(&cm->item, name, &comm_type);
545 cm->nodeid = -1;
546 cm->local = 0;
547 cm->addr_count = 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_lowcomms_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 struct dlm_node *nd;
572
573 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
574 if (!nd)
575 return ERR_PTR(-ENOMEM);
576
577 config_item_init_type_name(&nd->item, name, &node_type);
578 nd->nodeid = -1;
579 nd->weight = 1; /* default weight of 1 if none is set */
580 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
581
582 mutex_lock(&sp->members_lock);
583 list_add(&nd->list, &sp->members);
584 sp->members_count++;
585 mutex_unlock(&sp->members_lock);
586
587 return &nd->item;
588 }
589
drop_node(struct config_group * g,struct config_item * i)590 static void drop_node(struct config_group *g, struct config_item *i)
591 {
592 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
593 struct dlm_node *nd = config_item_to_node(i);
594
595 mutex_lock(&sp->members_lock);
596 list_del(&nd->list);
597 sp->members_count--;
598 mutex_unlock(&sp->members_lock);
599
600 config_item_put(i);
601 }
602
release_node(struct config_item * i)603 static void release_node(struct config_item *i)
604 {
605 struct dlm_node *nd = config_item_to_node(i);
606 kfree(nd);
607 }
608
609 static struct dlm_clusters clusters_root = {
610 .subsys = {
611 .su_group = {
612 .cg_item = {
613 .ci_namebuf = "dlm",
614 .ci_type = &clusters_type,
615 },
616 },
617 },
618 };
619
dlm_config_init(void)620 int __init dlm_config_init(void)
621 {
622 config_group_init(&clusters_root.subsys.su_group);
623 mutex_init(&clusters_root.subsys.su_mutex);
624 return configfs_register_subsystem(&clusters_root.subsys);
625 }
626
dlm_config_exit(void)627 void dlm_config_exit(void)
628 {
629 configfs_unregister_subsystem(&clusters_root.subsys);
630 }
631
632 /*
633 * Functions for user space to read/write attributes
634 */
635
show_cluster(struct config_item * i,struct configfs_attribute * a,char * buf)636 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
637 char *buf)
638 {
639 struct dlm_cluster *cl = config_item_to_cluster(i);
640 struct cluster_attribute *cla =
641 container_of(a, struct cluster_attribute, attr);
642 return cla->show ? cla->show(cl, buf) : 0;
643 }
644
store_cluster(struct config_item * i,struct configfs_attribute * a,const char * buf,size_t len)645 static ssize_t store_cluster(struct config_item *i,
646 struct configfs_attribute *a,
647 const char *buf, size_t len)
648 {
649 struct dlm_cluster *cl = config_item_to_cluster(i);
650 struct cluster_attribute *cla =
651 container_of(a, struct cluster_attribute, attr);
652 return cla->store ? cla->store(cl, buf, len) : -EINVAL;
653 }
654
show_comm(struct config_item * i,struct configfs_attribute * a,char * buf)655 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
656 char *buf)
657 {
658 struct dlm_comm *cm = config_item_to_comm(i);
659 struct comm_attribute *cma =
660 container_of(a, struct comm_attribute, attr);
661 return cma->show ? cma->show(cm, buf) : 0;
662 }
663
store_comm(struct config_item * i,struct configfs_attribute * a,const char * buf,size_t len)664 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
665 const char *buf, size_t len)
666 {
667 struct dlm_comm *cm = config_item_to_comm(i);
668 struct comm_attribute *cma =
669 container_of(a, struct comm_attribute, attr);
670 return cma->store ? cma->store(cm, buf, len) : -EINVAL;
671 }
672
comm_nodeid_read(struct dlm_comm * cm,char * buf)673 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf)
674 {
675 return sprintf(buf, "%d\n", cm->nodeid);
676 }
677
comm_nodeid_write(struct dlm_comm * cm,const char * buf,size_t len)678 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
679 size_t len)
680 {
681 cm->nodeid = simple_strtol(buf, NULL, 0);
682 return len;
683 }
684
comm_local_read(struct dlm_comm * cm,char * buf)685 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
686 {
687 return sprintf(buf, "%d\n", cm->local);
688 }
689
comm_local_write(struct dlm_comm * cm,const char * buf,size_t len)690 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
691 size_t len)
692 {
693 cm->local= simple_strtol(buf, NULL, 0);
694 if (cm->local && !local_comm)
695 local_comm = cm;
696 return len;
697 }
698
comm_addr_write(struct dlm_comm * cm,const char * buf,size_t len)699 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
700 {
701 struct sockaddr_storage *addr;
702
703 if (len != sizeof(struct sockaddr_storage))
704 return -EINVAL;
705
706 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
707 return -ENOSPC;
708
709 addr = kzalloc(sizeof(*addr), GFP_NOFS);
710 if (!addr)
711 return -ENOMEM;
712
713 memcpy(addr, buf, len);
714 cm->addr[cm->addr_count++] = addr;
715 return len;
716 }
717
show_node(struct config_item * i,struct configfs_attribute * a,char * buf)718 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
719 char *buf)
720 {
721 struct dlm_node *nd = config_item_to_node(i);
722 struct node_attribute *nda =
723 container_of(a, struct node_attribute, attr);
724 return nda->show ? nda->show(nd, buf) : 0;
725 }
726
store_node(struct config_item * i,struct configfs_attribute * a,const char * buf,size_t len)727 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
728 const char *buf, size_t len)
729 {
730 struct dlm_node *nd = config_item_to_node(i);
731 struct node_attribute *nda =
732 container_of(a, struct node_attribute, attr);
733 return nda->store ? nda->store(nd, buf, len) : -EINVAL;
734 }
735
node_nodeid_read(struct dlm_node * nd,char * buf)736 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
737 {
738 return sprintf(buf, "%d\n", nd->nodeid);
739 }
740
node_nodeid_write(struct dlm_node * nd,const char * buf,size_t len)741 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
742 size_t len)
743 {
744 nd->nodeid = simple_strtol(buf, NULL, 0);
745 return len;
746 }
747
node_weight_read(struct dlm_node * nd,char * buf)748 static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
749 {
750 return sprintf(buf, "%d\n", nd->weight);
751 }
752
node_weight_write(struct dlm_node * nd,const char * buf,size_t len)753 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
754 size_t len)
755 {
756 nd->weight = simple_strtol(buf, NULL, 0);
757 return len;
758 }
759
760 /*
761 * Functions for the dlm to get the info that's been configured
762 */
763
get_space(char * name)764 static struct dlm_space *get_space(char *name)
765 {
766 struct config_item *i;
767
768 if (!space_list)
769 return NULL;
770
771 mutex_lock(&space_list->cg_subsys->su_mutex);
772 i = config_group_find_item(space_list, name);
773 mutex_unlock(&space_list->cg_subsys->su_mutex);
774
775 return config_item_to_space(i);
776 }
777
put_space(struct dlm_space * sp)778 static void put_space(struct dlm_space *sp)
779 {
780 config_item_put(&sp->group.cg_item);
781 }
782
addr_compare(struct sockaddr_storage * x,struct sockaddr_storage * y)783 static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y)
784 {
785 switch (x->ss_family) {
786 case AF_INET: {
787 struct sockaddr_in *sinx = (struct sockaddr_in *)x;
788 struct sockaddr_in *siny = (struct sockaddr_in *)y;
789 if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr)
790 return 0;
791 if (sinx->sin_port != siny->sin_port)
792 return 0;
793 break;
794 }
795 case AF_INET6: {
796 struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x;
797 struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y;
798 if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr))
799 return 0;
800 if (sinx->sin6_port != siny->sin6_port)
801 return 0;
802 break;
803 }
804 default:
805 return 0;
806 }
807 return 1;
808 }
809
get_comm(int nodeid,struct sockaddr_storage * addr)810 static struct dlm_comm *get_comm(int nodeid, struct sockaddr_storage *addr)
811 {
812 struct config_item *i;
813 struct dlm_comm *cm = NULL;
814 int found = 0;
815
816 if (!comm_list)
817 return NULL;
818
819 mutex_lock(&clusters_root.subsys.su_mutex);
820
821 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
822 cm = config_item_to_comm(i);
823
824 if (nodeid) {
825 if (cm->nodeid != nodeid)
826 continue;
827 found = 1;
828 config_item_get(i);
829 break;
830 } else {
831 if (!cm->addr_count || !addr_compare(cm->addr[0], addr))
832 continue;
833 found = 1;
834 config_item_get(i);
835 break;
836 }
837 }
838 mutex_unlock(&clusters_root.subsys.su_mutex);
839
840 if (!found)
841 cm = NULL;
842 return cm;
843 }
844
put_comm(struct dlm_comm * cm)845 static void put_comm(struct dlm_comm *cm)
846 {
847 config_item_put(&cm->item);
848 }
849
850 /* caller must free mem */
dlm_nodeid_list(char * lsname,int ** ids_out,int * ids_count_out,int ** new_out,int * new_count_out)851 int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out,
852 int **new_out, int *new_count_out)
853 {
854 struct dlm_space *sp;
855 struct dlm_node *nd;
856 int i = 0, rv = 0, ids_count = 0, new_count = 0;
857 int *ids, *new;
858
859 sp = get_space(lsname);
860 if (!sp)
861 return -EEXIST;
862
863 mutex_lock(&sp->members_lock);
864 if (!sp->members_count) {
865 rv = -EINVAL;
866 printk(KERN_ERR "dlm: zero members_count\n");
867 goto out;
868 }
869
870 ids_count = sp->members_count;
871
872 ids = kcalloc(ids_count, sizeof(int), GFP_NOFS);
873 if (!ids) {
874 rv = -ENOMEM;
875 goto out;
876 }
877
878 list_for_each_entry(nd, &sp->members, list) {
879 ids[i++] = nd->nodeid;
880 if (nd->new)
881 new_count++;
882 }
883
884 if (ids_count != i)
885 printk(KERN_ERR "dlm: bad nodeid count %d %d\n", ids_count, i);
886
887 if (!new_count)
888 goto out_ids;
889
890 new = kcalloc(new_count, sizeof(int), GFP_NOFS);
891 if (!new) {
892 kfree(ids);
893 rv = -ENOMEM;
894 goto out;
895 }
896
897 i = 0;
898 list_for_each_entry(nd, &sp->members, list) {
899 if (nd->new) {
900 new[i++] = nd->nodeid;
901 nd->new = 0;
902 }
903 }
904 *new_count_out = new_count;
905 *new_out = new;
906
907 out_ids:
908 *ids_count_out = ids_count;
909 *ids_out = ids;
910 out:
911 mutex_unlock(&sp->members_lock);
912 put_space(sp);
913 return rv;
914 }
915
dlm_node_weight(char * lsname,int nodeid)916 int dlm_node_weight(char *lsname, int nodeid)
917 {
918 struct dlm_space *sp;
919 struct dlm_node *nd;
920 int w = -EEXIST;
921
922 sp = get_space(lsname);
923 if (!sp)
924 goto out;
925
926 mutex_lock(&sp->members_lock);
927 list_for_each_entry(nd, &sp->members, list) {
928 if (nd->nodeid != nodeid)
929 continue;
930 w = nd->weight;
931 break;
932 }
933 mutex_unlock(&sp->members_lock);
934 put_space(sp);
935 out:
936 return w;
937 }
938
dlm_nodeid_to_addr(int nodeid,struct sockaddr_storage * addr)939 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
940 {
941 struct dlm_comm *cm = get_comm(nodeid, NULL);
942 if (!cm)
943 return -EEXIST;
944 if (!cm->addr_count)
945 return -ENOENT;
946 memcpy(addr, cm->addr[0], sizeof(*addr));
947 put_comm(cm);
948 return 0;
949 }
950
dlm_addr_to_nodeid(struct sockaddr_storage * addr,int * nodeid)951 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
952 {
953 struct dlm_comm *cm = get_comm(0, addr);
954 if (!cm)
955 return -EEXIST;
956 *nodeid = cm->nodeid;
957 put_comm(cm);
958 return 0;
959 }
960
dlm_our_nodeid(void)961 int dlm_our_nodeid(void)
962 {
963 return local_comm ? local_comm->nodeid : 0;
964 }
965
966 /* num 0 is first addr, num 1 is second addr */
dlm_our_addr(struct sockaddr_storage * addr,int num)967 int dlm_our_addr(struct sockaddr_storage *addr, int num)
968 {
969 if (!local_comm)
970 return -1;
971 if (num + 1 > local_comm->addr_count)
972 return -1;
973 memcpy(addr, local_comm->addr[num], sizeof(*addr));
974 return 0;
975 }
976
977 /* Config file defaults */
978 #define DEFAULT_TCP_PORT 21064
979 #define DEFAULT_BUFFER_SIZE 4096
980 #define DEFAULT_RSBTBL_SIZE 1024
981 #define DEFAULT_LKBTBL_SIZE 1024
982 #define DEFAULT_DIRTBL_SIZE 1024
983 #define DEFAULT_RECOVER_TIMER 5
984 #define DEFAULT_TOSS_SECS 10
985 #define DEFAULT_SCAN_SECS 5
986 #define DEFAULT_LOG_DEBUG 0
987 #define DEFAULT_PROTOCOL 0
988 #define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */
989
990 struct dlm_config_info dlm_config = {
991 .ci_tcp_port = DEFAULT_TCP_PORT,
992 .ci_buffer_size = DEFAULT_BUFFER_SIZE,
993 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
994 .ci_lkbtbl_size = DEFAULT_LKBTBL_SIZE,
995 .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
996 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
997 .ci_toss_secs = DEFAULT_TOSS_SECS,
998 .ci_scan_secs = DEFAULT_SCAN_SECS,
999 .ci_log_debug = DEFAULT_LOG_DEBUG,
1000 .ci_protocol = DEFAULT_PROTOCOL,
1001 .ci_timewarn_cs = DEFAULT_TIMEWARN_CS
1002 };
1003
1004