1 /******************************************************************************
2 *******************************************************************************
3 **
4 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5 ** Copyright (C) 2004-2007 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 <net/sock.h>
18
19 #include "config.h"
20 #include "lowcomms.h"
21
22 /*
23 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
24 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
25 * /config/dlm/<cluster>/comms/<comm>/nodeid
26 * /config/dlm/<cluster>/comms/<comm>/local
27 * /config/dlm/<cluster>/comms/<comm>/addr
28 * The <cluster> level is useless, but I haven't figured out how to avoid it.
29 */
30
31 static struct config_group *space_list;
32 static struct config_group *comm_list;
33 static struct comm *local_comm;
34
35 struct clusters;
36 struct cluster;
37 struct spaces;
38 struct space;
39 struct comms;
40 struct comm;
41 struct nodes;
42 struct node;
43
44 static struct config_group *make_cluster(struct config_group *, const char *);
45 static void drop_cluster(struct config_group *, struct config_item *);
46 static void release_cluster(struct config_item *);
47 static struct config_group *make_space(struct config_group *, const char *);
48 static void drop_space(struct config_group *, struct config_item *);
49 static void release_space(struct config_item *);
50 static struct config_item *make_comm(struct config_group *, const char *);
51 static void drop_comm(struct config_group *, struct config_item *);
52 static void release_comm(struct config_item *);
53 static struct config_item *make_node(struct config_group *, const char *);
54 static void drop_node(struct config_group *, struct config_item *);
55 static void release_node(struct config_item *);
56
57 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
58 char *buf);
59 static ssize_t store_cluster(struct config_item *i,
60 struct configfs_attribute *a,
61 const char *buf, size_t len);
62 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
63 char *buf);
64 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
65 const char *buf, size_t len);
66 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
67 char *buf);
68 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
69 const char *buf, size_t len);
70
71 static ssize_t comm_nodeid_read(struct comm *cm, char *buf);
72 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len);
73 static ssize_t comm_local_read(struct comm *cm, char *buf);
74 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len);
75 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len);
76 static ssize_t node_nodeid_read(struct node *nd, char *buf);
77 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len);
78 static ssize_t node_weight_read(struct node *nd, char *buf);
79 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len);
80
81 struct cluster {
82 struct config_group group;
83 unsigned int cl_tcp_port;
84 unsigned int cl_buffer_size;
85 unsigned int cl_rsbtbl_size;
86 unsigned int cl_lkbtbl_size;
87 unsigned int cl_dirtbl_size;
88 unsigned int cl_recover_timer;
89 unsigned int cl_toss_secs;
90 unsigned int cl_scan_secs;
91 unsigned int cl_log_debug;
92 unsigned int cl_protocol;
93 unsigned int cl_timewarn_cs;
94 };
95
96 enum {
97 CLUSTER_ATTR_TCP_PORT = 0,
98 CLUSTER_ATTR_BUFFER_SIZE,
99 CLUSTER_ATTR_RSBTBL_SIZE,
100 CLUSTER_ATTR_LKBTBL_SIZE,
101 CLUSTER_ATTR_DIRTBL_SIZE,
102 CLUSTER_ATTR_RECOVER_TIMER,
103 CLUSTER_ATTR_TOSS_SECS,
104 CLUSTER_ATTR_SCAN_SECS,
105 CLUSTER_ATTR_LOG_DEBUG,
106 CLUSTER_ATTR_PROTOCOL,
107 CLUSTER_ATTR_TIMEWARN_CS,
108 };
109
110 struct cluster_attribute {
111 struct configfs_attribute attr;
112 ssize_t (*show)(struct cluster *, char *);
113 ssize_t (*store)(struct cluster *, const char *, size_t);
114 };
115
116 static ssize_t cluster_set(struct cluster *cl, unsigned int *cl_field,
117 unsigned int *info_field, int check_zero,
118 const char *buf, size_t len)
119 {
120 unsigned int x;
121
122 if (!capable(CAP_SYS_ADMIN))
123 return -EACCES;
124
125 x = simple_strtoul(buf, NULL, 0);
126
127 if (check_zero && !x)
128 return -EINVAL;
129
130 *cl_field = x;
131 *info_field = x;
132
133 return len;
134 }
135
136 #define CLUSTER_ATTR(name, check_zero) \
137 static ssize_t name##_write(struct cluster *cl, const char *buf, size_t len) \
138 { \
139 return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \
140 check_zero, buf, len); \
141 } \
142 static ssize_t name##_read(struct cluster *cl, char *buf) \
143 { \
144 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
145 } \
146 static struct cluster_attribute cluster_attr_##name = \
147 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
148
149 CLUSTER_ATTR(tcp_port, 1);
150 CLUSTER_ATTR(buffer_size, 1);
151 CLUSTER_ATTR(rsbtbl_size, 1);
152 CLUSTER_ATTR(lkbtbl_size, 1);
153 CLUSTER_ATTR(dirtbl_size, 1);
154 CLUSTER_ATTR(recover_timer, 1);
155 CLUSTER_ATTR(toss_secs, 1);
156 CLUSTER_ATTR(scan_secs, 1);
157 CLUSTER_ATTR(log_debug, 0);
158 CLUSTER_ATTR(protocol, 0);
159 CLUSTER_ATTR(timewarn_cs, 1);
160
161 static struct configfs_attribute *cluster_attrs[] = {
162 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
163 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
164 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
165 [CLUSTER_ATTR_LKBTBL_SIZE] = &cluster_attr_lkbtbl_size.attr,
166 [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr,
167 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
168 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
169 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
170 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
171 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
172 [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
173 NULL,
174 };
175
176 enum {
177 COMM_ATTR_NODEID = 0,
178 COMM_ATTR_LOCAL,
179 COMM_ATTR_ADDR,
180 };
181
182 struct comm_attribute {
183 struct configfs_attribute attr;
184 ssize_t (*show)(struct comm *, char *);
185 ssize_t (*store)(struct comm *, const char *, size_t);
186 };
187
188 static struct comm_attribute comm_attr_nodeid = {
189 .attr = { .ca_owner = THIS_MODULE,
190 .ca_name = "nodeid",
191 .ca_mode = S_IRUGO | S_IWUSR },
192 .show = comm_nodeid_read,
193 .store = comm_nodeid_write,
194 };
195
196 static struct comm_attribute comm_attr_local = {
197 .attr = { .ca_owner = THIS_MODULE,
198 .ca_name = "local",
199 .ca_mode = S_IRUGO | S_IWUSR },
200 .show = comm_local_read,
201 .store = comm_local_write,
202 };
203
204 static struct comm_attribute comm_attr_addr = {
205 .attr = { .ca_owner = THIS_MODULE,
206 .ca_name = "addr",
207 .ca_mode = S_IRUGO | S_IWUSR },
208 .store = comm_addr_write,
209 };
210
211 static struct configfs_attribute *comm_attrs[] = {
212 [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
213 [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
214 [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
215 NULL,
216 };
217
218 enum {
219 NODE_ATTR_NODEID = 0,
220 NODE_ATTR_WEIGHT,
221 };
222
223 struct node_attribute {
224 struct configfs_attribute attr;
225 ssize_t (*show)(struct node *, char *);
226 ssize_t (*store)(struct node *, const char *, size_t);
227 };
228
229 static struct node_attribute node_attr_nodeid = {
230 .attr = { .ca_owner = THIS_MODULE,
231 .ca_name = "nodeid",
232 .ca_mode = S_IRUGO | S_IWUSR },
233 .show = node_nodeid_read,
234 .store = node_nodeid_write,
235 };
236
237 static struct node_attribute node_attr_weight = {
238 .attr = { .ca_owner = THIS_MODULE,
239 .ca_name = "weight",
240 .ca_mode = S_IRUGO | S_IWUSR },
241 .show = node_weight_read,
242 .store = node_weight_write,
243 };
244
245 static struct configfs_attribute *node_attrs[] = {
246 [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
247 [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
248 NULL,
249 };
250
251 struct clusters {
252 struct configfs_subsystem subsys;
253 };
254
255 struct spaces {
256 struct config_group ss_group;
257 };
258
259 struct space {
260 struct config_group group;
261 struct list_head members;
262 struct mutex members_lock;
263 int members_count;
264 };
265
266 struct comms {
267 struct config_group cs_group;
268 };
269
270 struct comm {
271 struct config_item item;
272 int nodeid;
273 int local;
274 int addr_count;
275 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
276 };
277
278 struct nodes {
279 struct config_group ns_group;
280 };
281
282 struct node {
283 struct config_item item;
284 struct list_head list; /* space->members */
285 int nodeid;
286 int weight;
287 };
288
289 static struct configfs_group_operations clusters_ops = {
290 .make_group = make_cluster,
291 .drop_item = drop_cluster,
292 };
293
294 static struct configfs_item_operations cluster_ops = {
295 .release = release_cluster,
296 .show_attribute = show_cluster,
297 .store_attribute = store_cluster,
298 };
299
300 static struct configfs_group_operations spaces_ops = {
301 .make_group = make_space,
302 .drop_item = drop_space,
303 };
304
305 static struct configfs_item_operations space_ops = {
306 .release = release_space,
307 };
308
309 static struct configfs_group_operations comms_ops = {
310 .make_item = make_comm,
311 .drop_item = drop_comm,
312 };
313
314 static struct configfs_item_operations comm_ops = {
315 .release = release_comm,
316 .show_attribute = show_comm,
317 .store_attribute = store_comm,
318 };
319
320 static struct configfs_group_operations nodes_ops = {
321 .make_item = make_node,
322 .drop_item = drop_node,
323 };
324
325 static struct configfs_item_operations node_ops = {
326 .release = release_node,
327 .show_attribute = show_node,
328 .store_attribute = store_node,
329 };
330
331 static struct config_item_type clusters_type = {
332 .ct_group_ops = &clusters_ops,
333 .ct_owner = THIS_MODULE,
334 };
335
336 static struct config_item_type cluster_type = {
337 .ct_item_ops = &cluster_ops,
338 .ct_attrs = cluster_attrs,
339 .ct_owner = THIS_MODULE,
340 };
341
342 static struct config_item_type spaces_type = {
343 .ct_group_ops = &spaces_ops,
344 .ct_owner = THIS_MODULE,
345 };
346
347 static struct config_item_type space_type = {
348 .ct_item_ops = &space_ops,
349 .ct_owner = THIS_MODULE,
350 };
351
352 static struct config_item_type comms_type = {
353 .ct_group_ops = &comms_ops,
354 .ct_owner = THIS_MODULE,
355 };
356
357 static struct config_item_type comm_type = {
358 .ct_item_ops = &comm_ops,
359 .ct_attrs = comm_attrs,
360 .ct_owner = THIS_MODULE,
361 };
362
363 static struct config_item_type nodes_type = {
364 .ct_group_ops = &nodes_ops,
365 .ct_owner = THIS_MODULE,
366 };
367
368 static struct config_item_type node_type = {
369 .ct_item_ops = &node_ops,
370 .ct_attrs = node_attrs,
371 .ct_owner = THIS_MODULE,
372 };
373
374 static struct cluster *to_cluster(struct config_item *i)
375 {
376 return i ? container_of(to_config_group(i), struct cluster, group):NULL;
377 }
378
379 static struct space *to_space(struct config_item *i)
380 {
381 return i ? container_of(to_config_group(i), struct space, group) : NULL;
382 }
383
384 static struct comm *to_comm(struct config_item *i)
385 {
386 return i ? container_of(i, struct comm, item) : NULL;
387 }
388
389 static struct node *to_node(struct config_item *i)
390 {
391 return i ? container_of(i, struct node, item) : NULL;
392 }
393
394 static struct config_group *make_cluster(struct config_group *g,
395 const char *name)
396 {
397 struct cluster *cl = NULL;
398 struct spaces *sps = NULL;
399 struct comms *cms = NULL;
400 void *gps = NULL;
401
402 cl = kzalloc(sizeof(struct cluster), GFP_KERNEL);
403 gps = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
404 sps = kzalloc(sizeof(struct spaces), GFP_KERNEL);
405 cms = kzalloc(sizeof(struct comms), GFP_KERNEL);
406
407 if (!cl || !gps || !sps || !cms)
408 goto fail;
409
410 config_group_init_type_name(&cl->group, name, &cluster_type);
411 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
412 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
413
414 cl->group.default_groups = gps;
415 cl->group.default_groups[0] = &sps->ss_group;
416 cl->group.default_groups[1] = &cms->cs_group;
417 cl->group.default_groups[2] = NULL;
418
419 cl->cl_tcp_port = dlm_config.ci_tcp_port;
420 cl->cl_buffer_size = dlm_config.ci_buffer_size;
421 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
422 cl->cl_lkbtbl_size = dlm_config.ci_lkbtbl_size;
423 cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
424 cl->cl_recover_timer = dlm_config.ci_recover_timer;
425 cl->cl_toss_secs = dlm_config.ci_toss_secs;
426 cl->cl_scan_secs = dlm_config.ci_scan_secs;
427 cl->cl_log_debug = dlm_config.ci_log_debug;
428 cl->cl_protocol = dlm_config.ci_protocol;
429 cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
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(gps);
438 kfree(sps);
439 kfree(cms);
440 return NULL;
441 }
442
443 static void drop_cluster(struct config_group *g, struct config_item *i)
444 {
445 struct cluster *cl = to_cluster(i);
446 struct config_item *tmp;
447 int j;
448
449 for (j = 0; cl->group.default_groups[j]; j++) {
450 tmp = &cl->group.default_groups[j]->cg_item;
451 cl->group.default_groups[j] = NULL;
452 config_item_put(tmp);
453 }
454
455 space_list = NULL;
456 comm_list = NULL;
457
458 config_item_put(i);
459 }
460
461 static void release_cluster(struct config_item *i)
462 {
463 struct cluster *cl = to_cluster(i);
464 kfree(cl->group.default_groups);
465 kfree(cl);
466 }
467
468 static struct config_group *make_space(struct config_group *g, const char *name)
469 {
470 struct space *sp = NULL;
471 struct nodes *nds = NULL;
472 void *gps = NULL;
473
474 sp = kzalloc(sizeof(struct space), GFP_KERNEL);
475 gps = kcalloc(2, sizeof(struct config_group *), GFP_KERNEL);
476 nds = kzalloc(sizeof(struct nodes), GFP_KERNEL);
477
478 if (!sp || !gps || !nds)
479 goto fail;
480
481 config_group_init_type_name(&sp->group, name, &space_type);
482 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
483
484 sp->group.default_groups = gps;
485 sp->group.default_groups[0] = &nds->ns_group;
486 sp->group.default_groups[1] = NULL;
487
488 INIT_LIST_HEAD(&sp->members);
489 mutex_init(&sp->members_lock);
490 sp->members_count = 0;
491 return &sp->group;
492
493 fail:
494 kfree(sp);
495 kfree(gps);
496 kfree(nds);
497 return NULL;
498 }
499
500 static void drop_space(struct config_group *g, struct config_item *i)
501 {
502 struct space *sp = to_space(i);
503 struct config_item *tmp;
504 int j;
505
506 /* assert list_empty(&sp->members) */
507
508 for (j = 0; sp->group.default_groups[j]; j++) {
509 tmp = &sp->group.default_groups[j]->cg_item;
510 sp->group.default_groups[j] = NULL;
511 config_item_put(tmp);
512 }
513
514 config_item_put(i);
515 }
516
517 static void release_space(struct config_item *i)
518 {
519 struct space *sp = to_space(i);
520 kfree(sp->group.default_groups);
521 kfree(sp);
522 }
523
524 static struct config_item *make_comm(struct config_group *g, const char *name)
525 {
526 struct comm *cm;
527
528 cm = kzalloc(sizeof(struct comm), GFP_KERNEL);
529 if (!cm)
530 return NULL;
531
532 config_item_init_type_name(&cm->item, name, &comm_type);
533 cm->nodeid = -1;
534 cm->local = 0;
535 cm->addr_count = 0;
536 return &cm->item;
537 }
538
539 static void drop_comm(struct config_group *g, struct config_item *i)
540 {
541 struct comm *cm = to_comm(i);
542 if (local_comm == cm)
543 local_comm = NULL;
544 dlm_lowcomms_close(cm->nodeid);
545 while (cm->addr_count--)
546 kfree(cm->addr[cm->addr_count]);
547 config_item_put(i);
548 }
549
550 static void release_comm(struct config_item *i)
551 {
552 struct comm *cm = to_comm(i);
553 kfree(cm);
554 }
555
556 static struct config_item *make_node(struct config_group *g, const char *name)
557 {
558 struct space *sp = to_space(g->cg_item.ci_parent);
559 struct node *nd;
560
561 nd = kzalloc(sizeof(struct node), GFP_KERNEL);
562 if (!nd)
563 return NULL;
564
565 config_item_init_type_name(&nd->item, name, &node_type);
566 nd->nodeid = -1;
567 nd->weight = 1; /* default weight of 1 if none is set */
568
569 mutex_lock(&sp->members_lock);
570 list_add(&nd->list, &sp->members);
571 sp->members_count++;
572 mutex_unlock(&sp->members_lock);
573
574 return &nd->item;
575 }
576
577 static void drop_node(struct config_group *g, struct config_item *i)
578 {
579 struct space *sp = to_space(g->cg_item.ci_parent);
580 struct node *nd = to_node(i);
581
582 mutex_lock(&sp->members_lock);
583 list_del(&nd->list);
584 sp->members_count--;
585 mutex_unlock(&sp->members_lock);
586
587 config_item_put(i);
588 }
589
590 static void release_node(struct config_item *i)
591 {
592 struct node *nd = to_node(i);
593 kfree(nd);
594 }
595
596 static struct clusters clusters_root = {
597 .subsys = {
598 .su_group = {
599 .cg_item = {
600 .ci_namebuf = "dlm",
601 .ci_type = &clusters_type,
602 },
603 },
604 },
605 };
606
607 int __init dlm_config_init(void)
608 {
609 config_group_init(&clusters_root.subsys.su_group);
610 mutex_init(&clusters_root.subsys.su_mutex);
611 return configfs_register_subsystem(&clusters_root.subsys);
612 }
613
614 void dlm_config_exit(void)
615 {
616 configfs_unregister_subsystem(&clusters_root.subsys);
617 }
618
619 /*
620 * Functions for user space to read/write attributes
621 */
622
623 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
624 char *buf)
625 {
626 struct cluster *cl = to_cluster(i);
627 struct cluster_attribute *cla =
628 container_of(a, struct cluster_attribute, attr);
629 return cla->show ? cla->show(cl, buf) : 0;
630 }
631
632 static ssize_t store_cluster(struct config_item *i,
633 struct configfs_attribute *a,
634 const char *buf, size_t len)
635 {
636 struct cluster *cl = to_cluster(i);
637 struct cluster_attribute *cla =
638 container_of(a, struct cluster_attribute, attr);
639 return cla->store ? cla->store(cl, buf, len) : -EINVAL;
640 }
641
642 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
643 char *buf)
644 {
645 struct comm *cm = to_comm(i);
646 struct comm_attribute *cma =
647 container_of(a, struct comm_attribute, attr);
648 return cma->show ? cma->show(cm, buf) : 0;
649 }
650
651 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
652 const char *buf, size_t len)
653 {
654 struct comm *cm = to_comm(i);
655 struct comm_attribute *cma =
656 container_of(a, struct comm_attribute, attr);
657 return cma->store ? cma->store(cm, buf, len) : -EINVAL;
658 }
659
660 static ssize_t comm_nodeid_read(struct comm *cm, char *buf)
661 {
662 return sprintf(buf, "%d\n", cm->nodeid);
663 }
664
665 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len)
666 {
667 cm->nodeid = simple_strtol(buf, NULL, 0);
668 return len;
669 }
670
671 static ssize_t comm_local_read(struct comm *cm, char *buf)
672 {
673 return sprintf(buf, "%d\n", cm->local);
674 }
675
676 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len)
677 {
678 cm->local= simple_strtol(buf, NULL, 0);
679 if (cm->local && !local_comm)
680 local_comm = cm;
681 return len;
682 }
683
684 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len)
685 {
686 struct sockaddr_storage *addr;
687
688 if (len != sizeof(struct sockaddr_storage))
689 return -EINVAL;
690
691 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
692 return -ENOSPC;
693
694 addr = kzalloc(sizeof(*addr), GFP_KERNEL);
695 if (!addr)
696 return -ENOMEM;
697
698 memcpy(addr, buf, len);
699 cm->addr[cm->addr_count++] = addr;
700 return len;
701 }
702
703 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
704 char *buf)
705 {
706 struct node *nd = to_node(i);
707 struct node_attribute *nda =
708 container_of(a, struct node_attribute, attr);
709 return nda->show ? nda->show(nd, buf) : 0;
710 }
711
712 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
713 const char *buf, size_t len)
714 {
715 struct node *nd = to_node(i);
716 struct node_attribute *nda =
717 container_of(a, struct node_attribute, attr);
718 return nda->store ? nda->store(nd, buf, len) : -EINVAL;
719 }
720
721 static ssize_t node_nodeid_read(struct node *nd, char *buf)
722 {
723 return sprintf(buf, "%d\n", nd->nodeid);
724 }
725
726 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len)
727 {
728 nd->nodeid = simple_strtol(buf, NULL, 0);
729 return len;
730 }
731
732 static ssize_t node_weight_read(struct node *nd, char *buf)
733 {
734 return sprintf(buf, "%d\n", nd->weight);
735 }
736
737 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len)
738 {
739 nd->weight = simple_strtol(buf, NULL, 0);
740 return len;
741 }
742
743 /*
744 * Functions for the dlm to get the info that's been configured
745 */
746
747 static struct space *get_space(char *name)
748 {
749 struct config_item *i;
750
751 if (!space_list)
752 return NULL;
753
754 mutex_lock(&space_list->cg_subsys->su_mutex);
755 i = config_group_find_item(space_list, name);
756 mutex_unlock(&space_list->cg_subsys->su_mutex);
757
758 return to_space(i);
759 }
760
761 static void put_space(struct space *sp)
762 {
763 config_item_put(&sp->group.cg_item);
764 }
765
766 static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr)
767 {
768 struct config_item *i;
769 struct comm *cm = NULL;
770 int found = 0;
771
772 if (!comm_list)
773 return NULL;
774
775 mutex_lock(&clusters_root.subsys.su_mutex);
776
777 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
778 cm = to_comm(i);
779
780 if (nodeid) {
781 if (cm->nodeid != nodeid)
782 continue;
783 found = 1;
784 config_item_get(i);
785 break;
786 } else {
787 if (!cm->addr_count ||
788 memcmp(cm->addr[0], addr, sizeof(*addr)))
789 continue;
790 found = 1;
791 config_item_get(i);
792 break;
793 }
794 }
795 mutex_unlock(&clusters_root.subsys.su_mutex);
796
797 if (!found)
798 cm = NULL;
799 return cm;
800 }
801
802 static void put_comm(struct comm *cm)
803 {
804 config_item_put(&cm->item);
805 }
806
807 /* caller must free mem */
808 int dlm_nodeid_list(char *lsname, int **ids_out)
809 {
810 struct space *sp;
811 struct node *nd;
812 int i = 0, rv = 0;
813 int *ids;
814
815 sp = get_space(lsname);
816 if (!sp)
817 return -EEXIST;
818
819 mutex_lock(&sp->members_lock);
820 if (!sp->members_count) {
821 rv = 0;
822 goto out;
823 }
824
825 ids = kcalloc(sp->members_count, sizeof(int), GFP_KERNEL);
826 if (!ids) {
827 rv = -ENOMEM;
828 goto out;
829 }
830
831 rv = sp->members_count;
832 list_for_each_entry(nd, &sp->members, list)
833 ids[i++] = nd->nodeid;
834
835 if (rv != i)
836 printk("bad nodeid count %d %d\n", rv, i);
837
838 *ids_out = ids;
839 out:
840 mutex_unlock(&sp->members_lock);
841 put_space(sp);
842 return rv;
843 }
844
845 int dlm_node_weight(char *lsname, int nodeid)
846 {
847 struct space *sp;
848 struct node *nd;
849 int w = -EEXIST;
850
851 sp = get_space(lsname);
852 if (!sp)
853 goto out;
854
855 mutex_lock(&sp->members_lock);
856 list_for_each_entry(nd, &sp->members, list) {
857 if (nd->nodeid != nodeid)
858 continue;
859 w = nd->weight;
860 break;
861 }
862 mutex_unlock(&sp->members_lock);
863 put_space(sp);
864 out:
865 return w;
866 }
867
868 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
869 {
870 struct comm *cm = get_comm(nodeid, NULL);
871 if (!cm)
872 return -EEXIST;
873 if (!cm->addr_count)
874 return -ENOENT;
875 memcpy(addr, cm->addr[0], sizeof(*addr));
876 put_comm(cm);
877 return 0;
878 }
879
880 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
881 {
882 struct comm *cm = get_comm(0, addr);
883 if (!cm)
884 return -EEXIST;
885 *nodeid = cm->nodeid;
886 put_comm(cm);
887 return 0;
888 }
889
890 int dlm_our_nodeid(void)
891 {
892 return local_comm ? local_comm->nodeid : 0;
893 }
894
895 /* num 0 is first addr, num 1 is second addr */
896 int dlm_our_addr(struct sockaddr_storage *addr, int num)
897 {
898 if (!local_comm)
899 return -1;
900 if (num + 1 > local_comm->addr_count)
901 return -1;
902 memcpy(addr, local_comm->addr[num], sizeof(*addr));
903 return 0;
904 }
905
906 /* Config file defaults */
907 #define DEFAULT_TCP_PORT 21064
908 #define DEFAULT_BUFFER_SIZE 4096
909 #define DEFAULT_RSBTBL_SIZE 256
910 #define DEFAULT_LKBTBL_SIZE 1024
911 #define DEFAULT_DIRTBL_SIZE 512
912 #define DEFAULT_RECOVER_TIMER 5
913 #define DEFAULT_TOSS_SECS 10
914 #define DEFAULT_SCAN_SECS 5
915 #define DEFAULT_LOG_DEBUG 0
916 #define DEFAULT_PROTOCOL 0
917 #define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */
918
919 struct dlm_config_info dlm_config = {
920 .ci_tcp_port = DEFAULT_TCP_PORT,
921 .ci_buffer_size = DEFAULT_BUFFER_SIZE,
922 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
923 .ci_lkbtbl_size = DEFAULT_LKBTBL_SIZE,
924 .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
925 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
926 .ci_toss_secs = DEFAULT_TOSS_SECS,
927 .ci_scan_secs = DEFAULT_SCAN_SECS,
928 .ci_log_debug = DEFAULT_LOG_DEBUG,
929 .ci_protocol = DEFAULT_PROTOCOL,
930 .ci_timewarn_cs = DEFAULT_TIMEWARN_CS
931 };
932
933
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