1 /******************************************************************************
2 *******************************************************************************
3 **
4 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5 ** Copyright (C) 2004-2011 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 <linux/dlmconstants.h>
21 #include <net/ipv6.h>
22 #include <net/sock.h>
23
24 #include "config.h"
25 #include "lowcomms.h"
26
27 /*
28 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
29 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
30 * /config/dlm/<cluster>/comms/<comm>/nodeid
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 ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
65 char *buf);
66 static ssize_t store_cluster(struct config_item *i,
67 struct configfs_attribute *a,
68 const char *buf, size_t len);
69 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
70 char *buf);
71 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
72 const char *buf, size_t len);
73 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
74 char *buf);
75 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
76 const char *buf, size_t len);
77
78 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf);
79 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
80 size_t len);
81 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf);
82 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
83 size_t len);
84 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf,
85 size_t len);
86 static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf);
87 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf);
88 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
89 size_t len);
90 static ssize_t node_weight_read(struct dlm_node *nd, char *buf);
91 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
92 size_t len);
93
94 struct dlm_cluster {
95 struct config_group group;
96 unsigned int cl_tcp_port;
97 unsigned int cl_buffer_size;
98 unsigned int cl_rsbtbl_size;
99 unsigned int cl_recover_timer;
100 unsigned int cl_toss_secs;
101 unsigned int cl_scan_secs;
102 unsigned int cl_log_debug;
103 unsigned int cl_protocol;
104 unsigned int cl_timewarn_cs;
105 unsigned int cl_waitwarn_us;
106 unsigned int cl_new_rsb_count;
107 unsigned int cl_recover_callbacks;
108 char cl_cluster_name[DLM_LOCKSPACE_LEN];
109 };
110
111 enum {
112 CLUSTER_ATTR_TCP_PORT = 0,
113 CLUSTER_ATTR_BUFFER_SIZE,
114 CLUSTER_ATTR_RSBTBL_SIZE,
115 CLUSTER_ATTR_RECOVER_TIMER,
116 CLUSTER_ATTR_TOSS_SECS,
117 CLUSTER_ATTR_SCAN_SECS,
118 CLUSTER_ATTR_LOG_DEBUG,
119 CLUSTER_ATTR_PROTOCOL,
120 CLUSTER_ATTR_TIMEWARN_CS,
121 CLUSTER_ATTR_WAITWARN_US,
122 CLUSTER_ATTR_NEW_RSB_COUNT,
123 CLUSTER_ATTR_RECOVER_CALLBACKS,
124 CLUSTER_ATTR_CLUSTER_NAME,
125 };
126
127 struct cluster_attribute {
128 struct configfs_attribute attr;
129 ssize_t (*show)(struct dlm_cluster *, char *);
130 ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
131 };
132
cluster_cluster_name_read(struct dlm_cluster * cl,char * buf)133 static ssize_t cluster_cluster_name_read(struct dlm_cluster *cl, char *buf)
134 {
135 return sprintf(buf, "%s\n", cl->cl_cluster_name);
136 }
137
cluster_cluster_name_write(struct dlm_cluster * cl,const char * buf,size_t len)138 static ssize_t cluster_cluster_name_write(struct dlm_cluster *cl,
139 const char *buf, size_t len)
140 {
141 strlcpy(dlm_config.ci_cluster_name, buf,
142 sizeof(dlm_config.ci_cluster_name));
143 strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
144 return len;
145 }
146
147 static struct cluster_attribute cluster_attr_cluster_name = {
148 .attr = { .ca_owner = THIS_MODULE,
149 .ca_name = "cluster_name",
150 .ca_mode = S_IRUGO | S_IWUSR },
151 .show = cluster_cluster_name_read,
152 .store = cluster_cluster_name_write,
153 };
154
cluster_set(struct dlm_cluster * cl,unsigned int * cl_field,int * info_field,int check_zero,const char * buf,size_t len)155 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
156 int *info_field, int check_zero,
157 const char *buf, size_t len)
158 {
159 unsigned int x;
160 int rc;
161
162 if (!capable(CAP_SYS_ADMIN))
163 return -EPERM;
164 rc = kstrtouint(buf, 0, &x);
165 if (rc)
166 return rc;
167
168 if (check_zero && !x)
169 return -EINVAL;
170
171 *cl_field = x;
172 *info_field = x;
173
174 return len;
175 }
176
177 #define CLUSTER_ATTR(name, check_zero) \
178 static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
179 { \
180 return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \
181 check_zero, buf, len); \
182 } \
183 static ssize_t name##_read(struct dlm_cluster *cl, char *buf) \
184 { \
185 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
186 } \
187 static struct cluster_attribute cluster_attr_##name = \
188 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
189
190 CLUSTER_ATTR(tcp_port, 1);
191 CLUSTER_ATTR(buffer_size, 1);
192 CLUSTER_ATTR(rsbtbl_size, 1);
193 CLUSTER_ATTR(recover_timer, 1);
194 CLUSTER_ATTR(toss_secs, 1);
195 CLUSTER_ATTR(scan_secs, 1);
196 CLUSTER_ATTR(log_debug, 0);
197 CLUSTER_ATTR(protocol, 0);
198 CLUSTER_ATTR(timewarn_cs, 1);
199 CLUSTER_ATTR(waitwarn_us, 0);
200 CLUSTER_ATTR(new_rsb_count, 0);
201 CLUSTER_ATTR(recover_callbacks, 0);
202
203 static struct configfs_attribute *cluster_attrs[] = {
204 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
205 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
206 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
207 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
208 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
209 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
210 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
211 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
212 [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
213 [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr,
214 [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count.attr,
215 [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks.attr,
216 [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name.attr,
217 NULL,
218 };
219
220 enum {
221 COMM_ATTR_NODEID = 0,
222 COMM_ATTR_LOCAL,
223 COMM_ATTR_ADDR,
224 COMM_ATTR_ADDR_LIST,
225 };
226
227 struct comm_attribute {
228 struct configfs_attribute attr;
229 ssize_t (*show)(struct dlm_comm *, char *);
230 ssize_t (*store)(struct dlm_comm *, const char *, size_t);
231 };
232
233 static struct comm_attribute comm_attr_nodeid = {
234 .attr = { .ca_owner = THIS_MODULE,
235 .ca_name = "nodeid",
236 .ca_mode = S_IRUGO | S_IWUSR },
237 .show = comm_nodeid_read,
238 .store = comm_nodeid_write,
239 };
240
241 static struct comm_attribute comm_attr_local = {
242 .attr = { .ca_owner = THIS_MODULE,
243 .ca_name = "local",
244 .ca_mode = S_IRUGO | S_IWUSR },
245 .show = comm_local_read,
246 .store = comm_local_write,
247 };
248
249 static struct comm_attribute comm_attr_addr = {
250 .attr = { .ca_owner = THIS_MODULE,
251 .ca_name = "addr",
252 .ca_mode = S_IWUSR },
253 .store = comm_addr_write,
254 };
255
256 static struct comm_attribute comm_attr_addr_list = {
257 .attr = { .ca_owner = THIS_MODULE,
258 .ca_name = "addr_list",
259 .ca_mode = S_IRUGO },
260 .show = comm_addr_list_read,
261 };
262
263 static struct configfs_attribute *comm_attrs[] = {
264 [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
265 [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
266 [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
267 [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list.attr,
268 NULL,
269 };
270
271 enum {
272 NODE_ATTR_NODEID = 0,
273 NODE_ATTR_WEIGHT,
274 };
275
276 struct node_attribute {
277 struct configfs_attribute attr;
278 ssize_t (*show)(struct dlm_node *, char *);
279 ssize_t (*store)(struct dlm_node *, const char *, size_t);
280 };
281
282 static struct node_attribute node_attr_nodeid = {
283 .attr = { .ca_owner = THIS_MODULE,
284 .ca_name = "nodeid",
285 .ca_mode = S_IRUGO | S_IWUSR },
286 .show = node_nodeid_read,
287 .store = node_nodeid_write,
288 };
289
290 static struct node_attribute node_attr_weight = {
291 .attr = { .ca_owner = THIS_MODULE,
292 .ca_name = "weight",
293 .ca_mode = S_IRUGO | S_IWUSR },
294 .show = node_weight_read,
295 .store = node_weight_write,
296 };
297
298 static struct configfs_attribute *node_attrs[] = {
299 [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
300 [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
301 NULL,
302 };
303
304 struct dlm_clusters {
305 struct configfs_subsystem subsys;
306 };
307
308 struct dlm_spaces {
309 struct config_group ss_group;
310 };
311
312 struct dlm_space {
313 struct config_group group;
314 struct list_head members;
315 struct mutex members_lock;
316 int members_count;
317 };
318
319 struct dlm_comms {
320 struct config_group cs_group;
321 };
322
323 struct dlm_comm {
324 struct config_item item;
325 int seq;
326 int nodeid;
327 int local;
328 int addr_count;
329 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
330 };
331
332 struct dlm_nodes {
333 struct config_group ns_group;
334 };
335
336 struct dlm_node {
337 struct config_item item;
338 struct list_head list; /* space->members */
339 int nodeid;
340 int weight;
341 int new;
342 int comm_seq; /* copy of cm->seq when nd->nodeid is set */
343 };
344
345 static struct configfs_group_operations clusters_ops = {
346 .make_group = make_cluster,
347 .drop_item = drop_cluster,
348 };
349
350 static struct configfs_item_operations cluster_ops = {
351 .release = release_cluster,
352 .show_attribute = show_cluster,
353 .store_attribute = store_cluster,
354 };
355
356 static struct configfs_group_operations spaces_ops = {
357 .make_group = make_space,
358 .drop_item = drop_space,
359 };
360
361 static struct configfs_item_operations space_ops = {
362 .release = release_space,
363 };
364
365 static struct configfs_group_operations comms_ops = {
366 .make_item = make_comm,
367 .drop_item = drop_comm,
368 };
369
370 static struct configfs_item_operations comm_ops = {
371 .release = release_comm,
372 .show_attribute = show_comm,
373 .store_attribute = store_comm,
374 };
375
376 static struct configfs_group_operations nodes_ops = {
377 .make_item = make_node,
378 .drop_item = drop_node,
379 };
380
381 static struct configfs_item_operations node_ops = {
382 .release = release_node,
383 .show_attribute = show_node,
384 .store_attribute = store_node,
385 };
386
387 static struct config_item_type clusters_type = {
388 .ct_group_ops = &clusters_ops,
389 .ct_owner = THIS_MODULE,
390 };
391
392 static struct config_item_type cluster_type = {
393 .ct_item_ops = &cluster_ops,
394 .ct_attrs = cluster_attrs,
395 .ct_owner = THIS_MODULE,
396 };
397
398 static struct config_item_type spaces_type = {
399 .ct_group_ops = &spaces_ops,
400 .ct_owner = THIS_MODULE,
401 };
402
403 static struct config_item_type space_type = {
404 .ct_item_ops = &space_ops,
405 .ct_owner = THIS_MODULE,
406 };
407
408 static struct config_item_type comms_type = {
409 .ct_group_ops = &comms_ops,
410 .ct_owner = THIS_MODULE,
411 };
412
413 static struct config_item_type comm_type = {
414 .ct_item_ops = &comm_ops,
415 .ct_attrs = comm_attrs,
416 .ct_owner = THIS_MODULE,
417 };
418
419 static struct config_item_type nodes_type = {
420 .ct_group_ops = &nodes_ops,
421 .ct_owner = THIS_MODULE,
422 };
423
424 static struct config_item_type node_type = {
425 .ct_item_ops = &node_ops,
426 .ct_attrs = node_attrs,
427 .ct_owner = THIS_MODULE,
428 };
429
config_item_to_cluster(struct config_item * i)430 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
431 {
432 return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
433 NULL;
434 }
435
config_item_to_space(struct config_item * i)436 static struct dlm_space *config_item_to_space(struct config_item *i)
437 {
438 return i ? container_of(to_config_group(i), struct dlm_space, group) :
439 NULL;
440 }
441
config_item_to_comm(struct config_item * i)442 static struct dlm_comm *config_item_to_comm(struct config_item *i)
443 {
444 return i ? container_of(i, struct dlm_comm, item) : NULL;
445 }
446
config_item_to_node(struct config_item * i)447 static struct dlm_node *config_item_to_node(struct config_item *i)
448 {
449 return i ? container_of(i, struct dlm_node, item) : NULL;
450 }
451
make_cluster(struct config_group * g,const char * name)452 static struct config_group *make_cluster(struct config_group *g,
453 const char *name)
454 {
455 struct dlm_cluster *cl = NULL;
456 struct dlm_spaces *sps = NULL;
457 struct dlm_comms *cms = NULL;
458 void *gps = NULL;
459
460 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
461 gps = kcalloc(3, sizeof(struct config_group *), GFP_NOFS);
462 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
463 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
464
465 if (!cl || !gps || !sps || !cms)
466 goto fail;
467
468 config_group_init_type_name(&cl->group, name, &cluster_type);
469 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
470 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
471
472 cl->group.default_groups = gps;
473 cl->group.default_groups[0] = &sps->ss_group;
474 cl->group.default_groups[1] = &cms->cs_group;
475 cl->group.default_groups[2] = NULL;
476
477 cl->cl_tcp_port = dlm_config.ci_tcp_port;
478 cl->cl_buffer_size = dlm_config.ci_buffer_size;
479 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
480 cl->cl_recover_timer = dlm_config.ci_recover_timer;
481 cl->cl_toss_secs = dlm_config.ci_toss_secs;
482 cl->cl_scan_secs = dlm_config.ci_scan_secs;
483 cl->cl_log_debug = dlm_config.ci_log_debug;
484 cl->cl_protocol = dlm_config.ci_protocol;
485 cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
486 cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
487 cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
488 cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
489 memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
490 DLM_LOCKSPACE_LEN);
491
492 space_list = &sps->ss_group;
493 comm_list = &cms->cs_group;
494 return &cl->group;
495
496 fail:
497 kfree(cl);
498 kfree(gps);
499 kfree(sps);
500 kfree(cms);
501 return ERR_PTR(-ENOMEM);
502 }
503
drop_cluster(struct config_group * g,struct config_item * i)504 static void drop_cluster(struct config_group *g, struct config_item *i)
505 {
506 struct dlm_cluster *cl = config_item_to_cluster(i);
507 struct config_item *tmp;
508 int j;
509
510 for (j = 0; cl->group.default_groups[j]; j++) {
511 tmp = &cl->group.default_groups[j]->cg_item;
512 cl->group.default_groups[j] = NULL;
513 config_item_put(tmp);
514 }
515
516 space_list = NULL;
517 comm_list = NULL;
518
519 config_item_put(i);
520 }
521
release_cluster(struct config_item * i)522 static void release_cluster(struct config_item *i)
523 {
524 struct dlm_cluster *cl = config_item_to_cluster(i);
525 kfree(cl->group.default_groups);
526 kfree(cl);
527 }
528
make_space(struct config_group * g,const char * name)529 static struct config_group *make_space(struct config_group *g, const char *name)
530 {
531 struct dlm_space *sp = NULL;
532 struct dlm_nodes *nds = NULL;
533 void *gps = NULL;
534
535 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
536 gps = kcalloc(2, sizeof(struct config_group *), GFP_NOFS);
537 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
538
539 if (!sp || !gps || !nds)
540 goto fail;
541
542 config_group_init_type_name(&sp->group, name, &space_type);
543 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
544
545 sp->group.default_groups = gps;
546 sp->group.default_groups[0] = &nds->ns_group;
547 sp->group.default_groups[1] = NULL;
548
549 INIT_LIST_HEAD(&sp->members);
550 mutex_init(&sp->members_lock);
551 sp->members_count = 0;
552 return &sp->group;
553
554 fail:
555 kfree(sp);
556 kfree(gps);
557 kfree(nds);
558 return ERR_PTR(-ENOMEM);
559 }
560
drop_space(struct config_group * g,struct config_item * i)561 static void drop_space(struct config_group *g, struct config_item *i)
562 {
563 struct dlm_space *sp = config_item_to_space(i);
564 struct config_item *tmp;
565 int j;
566
567 /* assert list_empty(&sp->members) */
568
569 for (j = 0; sp->group.default_groups[j]; j++) {
570 tmp = &sp->group.default_groups[j]->cg_item;
571 sp->group.default_groups[j] = NULL;
572 config_item_put(tmp);
573 }
574
575 config_item_put(i);
576 }
577
release_space(struct config_item * i)578 static void release_space(struct config_item *i)
579 {
580 struct dlm_space *sp = config_item_to_space(i);
581 kfree(sp->group.default_groups);
582 kfree(sp);
583 }
584
make_comm(struct config_group * g,const char * name)585 static struct config_item *make_comm(struct config_group *g, const char *name)
586 {
587 struct dlm_comm *cm;
588
589 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
590 if (!cm)
591 return ERR_PTR(-ENOMEM);
592
593 config_item_init_type_name(&cm->item, name, &comm_type);
594
595 cm->seq = dlm_comm_count++;
596 if (!cm->seq)
597 cm->seq = dlm_comm_count++;
598
599 cm->nodeid = -1;
600 cm->local = 0;
601 cm->addr_count = 0;
602 return &cm->item;
603 }
604
drop_comm(struct config_group * g,struct config_item * i)605 static void drop_comm(struct config_group *g, struct config_item *i)
606 {
607 struct dlm_comm *cm = config_item_to_comm(i);
608 if (local_comm == cm)
609 local_comm = NULL;
610 dlm_lowcomms_close(cm->nodeid);
611 while (cm->addr_count--)
612 kfree(cm->addr[cm->addr_count]);
613 config_item_put(i);
614 }
615
release_comm(struct config_item * i)616 static void release_comm(struct config_item *i)
617 {
618 struct dlm_comm *cm = config_item_to_comm(i);
619 kfree(cm);
620 }
621
make_node(struct config_group * g,const char * name)622 static struct config_item *make_node(struct config_group *g, const char *name)
623 {
624 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
625 struct dlm_node *nd;
626
627 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
628 if (!nd)
629 return ERR_PTR(-ENOMEM);
630
631 config_item_init_type_name(&nd->item, name, &node_type);
632 nd->nodeid = -1;
633 nd->weight = 1; /* default weight of 1 if none is set */
634 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
635
636 mutex_lock(&sp->members_lock);
637 list_add(&nd->list, &sp->members);
638 sp->members_count++;
639 mutex_unlock(&sp->members_lock);
640
641 return &nd->item;
642 }
643
drop_node(struct config_group * g,struct config_item * i)644 static void drop_node(struct config_group *g, struct config_item *i)
645 {
646 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
647 struct dlm_node *nd = config_item_to_node(i);
648
649 mutex_lock(&sp->members_lock);
650 list_del(&nd->list);
651 sp->members_count--;
652 mutex_unlock(&sp->members_lock);
653
654 config_item_put(i);
655 }
656
release_node(struct config_item * i)657 static void release_node(struct config_item *i)
658 {
659 struct dlm_node *nd = config_item_to_node(i);
660 kfree(nd);
661 }
662
663 static struct dlm_clusters clusters_root = {
664 .subsys = {
665 .su_group = {
666 .cg_item = {
667 .ci_namebuf = "dlm",
668 .ci_type = &clusters_type,
669 },
670 },
671 },
672 };
673
dlm_config_init(void)674 int __init dlm_config_init(void)
675 {
676 config_group_init(&clusters_root.subsys.su_group);
677 mutex_init(&clusters_root.subsys.su_mutex);
678 return configfs_register_subsystem(&clusters_root.subsys);
679 }
680
dlm_config_exit(void)681 void dlm_config_exit(void)
682 {
683 configfs_unregister_subsystem(&clusters_root.subsys);
684 }
685
686 /*
687 * Functions for user space to read/write attributes
688 */
689
show_cluster(struct config_item * i,struct configfs_attribute * a,char * buf)690 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
691 char *buf)
692 {
693 struct dlm_cluster *cl = config_item_to_cluster(i);
694 struct cluster_attribute *cla =
695 container_of(a, struct cluster_attribute, attr);
696 return cla->show ? cla->show(cl, buf) : 0;
697 }
698
store_cluster(struct config_item * i,struct configfs_attribute * a,const char * buf,size_t len)699 static ssize_t store_cluster(struct config_item *i,
700 struct configfs_attribute *a,
701 const char *buf, size_t len)
702 {
703 struct dlm_cluster *cl = config_item_to_cluster(i);
704 struct cluster_attribute *cla =
705 container_of(a, struct cluster_attribute, attr);
706 return cla->store ? cla->store(cl, buf, len) : -EINVAL;
707 }
708
show_comm(struct config_item * i,struct configfs_attribute * a,char * buf)709 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
710 char *buf)
711 {
712 struct dlm_comm *cm = config_item_to_comm(i);
713 struct comm_attribute *cma =
714 container_of(a, struct comm_attribute, attr);
715 return cma->show ? cma->show(cm, buf) : 0;
716 }
717
store_comm(struct config_item * i,struct configfs_attribute * a,const char * buf,size_t len)718 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
719 const char *buf, size_t len)
720 {
721 struct dlm_comm *cm = config_item_to_comm(i);
722 struct comm_attribute *cma =
723 container_of(a, struct comm_attribute, attr);
724 return cma->store ? cma->store(cm, buf, len) : -EINVAL;
725 }
726
comm_nodeid_read(struct dlm_comm * cm,char * buf)727 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf)
728 {
729 return sprintf(buf, "%d\n", cm->nodeid);
730 }
731
comm_nodeid_write(struct dlm_comm * cm,const char * buf,size_t len)732 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
733 size_t len)
734 {
735 int rc = kstrtoint(buf, 0, &cm->nodeid);
736
737 if (rc)
738 return rc;
739 return len;
740 }
741
comm_local_read(struct dlm_comm * cm,char * buf)742 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
743 {
744 return sprintf(buf, "%d\n", cm->local);
745 }
746
comm_local_write(struct dlm_comm * cm,const char * buf,size_t len)747 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
748 size_t len)
749 {
750 int rc = kstrtoint(buf, 0, &cm->local);
751
752 if (rc)
753 return rc;
754 if (cm->local && !local_comm)
755 local_comm = cm;
756 return len;
757 }
758
comm_addr_write(struct dlm_comm * cm,const char * buf,size_t len)759 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
760 {
761 struct sockaddr_storage *addr;
762 int rv;
763
764 if (len != sizeof(struct sockaddr_storage))
765 return -EINVAL;
766
767 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
768 return -ENOSPC;
769
770 addr = kzalloc(sizeof(*addr), GFP_NOFS);
771 if (!addr)
772 return -ENOMEM;
773
774 memcpy(addr, buf, len);
775
776 rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
777 if (rv) {
778 kfree(addr);
779 return rv;
780 }
781
782 cm->addr[cm->addr_count++] = addr;
783 return len;
784 }
785
comm_addr_list_read(struct dlm_comm * cm,char * buf)786 static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf)
787 {
788 ssize_t s;
789 ssize_t allowance;
790 int i;
791 struct sockaddr_storage *addr;
792 struct sockaddr_in *addr_in;
793 struct sockaddr_in6 *addr_in6;
794
795 /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
796 char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
797
798
799 /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
800 allowance = 4096;
801 buf[0] = '\0';
802
803 for (i = 0; i < cm->addr_count; i++) {
804 addr = cm->addr[i];
805
806 switch(addr->ss_family) {
807 case AF_INET:
808 addr_in = (struct sockaddr_in *)addr;
809 s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr);
810 break;
811 case AF_INET6:
812 addr_in6 = (struct sockaddr_in6 *)addr;
813 s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr);
814 break;
815 default:
816 s = sprintf(buf0, "%s\n", "<UNKNOWN>");
817 break;
818 }
819 allowance -= s;
820 if (allowance >= 0)
821 strcat(buf, buf0);
822 else {
823 allowance += s;
824 break;
825 }
826 }
827 return 4096 - allowance;
828 }
829
show_node(struct config_item * i,struct configfs_attribute * a,char * buf)830 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
831 char *buf)
832 {
833 struct dlm_node *nd = config_item_to_node(i);
834 struct node_attribute *nda =
835 container_of(a, struct node_attribute, attr);
836 return nda->show ? nda->show(nd, buf) : 0;
837 }
838
store_node(struct config_item * i,struct configfs_attribute * a,const char * buf,size_t len)839 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
840 const char *buf, size_t len)
841 {
842 struct dlm_node *nd = config_item_to_node(i);
843 struct node_attribute *nda =
844 container_of(a, struct node_attribute, attr);
845 return nda->store ? nda->store(nd, buf, len) : -EINVAL;
846 }
847
node_nodeid_read(struct dlm_node * nd,char * buf)848 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
849 {
850 return sprintf(buf, "%d\n", nd->nodeid);
851 }
852
node_nodeid_write(struct dlm_node * nd,const char * buf,size_t len)853 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
854 size_t len)
855 {
856 uint32_t seq = 0;
857 int rc = kstrtoint(buf, 0, &nd->nodeid);
858
859 if (rc)
860 return rc;
861 dlm_comm_seq(nd->nodeid, &seq);
862 nd->comm_seq = seq;
863 return len;
864 }
865
node_weight_read(struct dlm_node * nd,char * buf)866 static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
867 {
868 return sprintf(buf, "%d\n", nd->weight);
869 }
870
node_weight_write(struct dlm_node * nd,const char * buf,size_t len)871 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
872 size_t len)
873 {
874 int rc = kstrtoint(buf, 0, &nd->weight);
875
876 if (rc)
877 return rc;
878 return len;
879 }
880
881 /*
882 * Functions for the dlm to get the info that's been configured
883 */
884
get_space(char * name)885 static struct dlm_space *get_space(char *name)
886 {
887 struct config_item *i;
888
889 if (!space_list)
890 return NULL;
891
892 mutex_lock(&space_list->cg_subsys->su_mutex);
893 i = config_group_find_item(space_list, name);
894 mutex_unlock(&space_list->cg_subsys->su_mutex);
895
896 return config_item_to_space(i);
897 }
898
put_space(struct dlm_space * sp)899 static void put_space(struct dlm_space *sp)
900 {
901 config_item_put(&sp->group.cg_item);
902 }
903
get_comm(int nodeid)904 static struct dlm_comm *get_comm(int nodeid)
905 {
906 struct config_item *i;
907 struct dlm_comm *cm = NULL;
908 int found = 0;
909
910 if (!comm_list)
911 return NULL;
912
913 mutex_lock(&clusters_root.subsys.su_mutex);
914
915 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
916 cm = config_item_to_comm(i);
917
918 if (cm->nodeid != nodeid)
919 continue;
920 found = 1;
921 config_item_get(i);
922 break;
923 }
924 mutex_unlock(&clusters_root.subsys.su_mutex);
925
926 if (!found)
927 cm = NULL;
928 return cm;
929 }
930
put_comm(struct dlm_comm * cm)931 static void put_comm(struct dlm_comm *cm)
932 {
933 config_item_put(&cm->item);
934 }
935
936 /* caller must free mem */
dlm_config_nodes(char * lsname,struct dlm_config_node ** nodes_out,int * count_out)937 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
938 int *count_out)
939 {
940 struct dlm_space *sp;
941 struct dlm_node *nd;
942 struct dlm_config_node *nodes, *node;
943 int rv, count;
944
945 sp = get_space(lsname);
946 if (!sp)
947 return -EEXIST;
948
949 mutex_lock(&sp->members_lock);
950 if (!sp->members_count) {
951 rv = -EINVAL;
952 printk(KERN_ERR "dlm: zero members_count\n");
953 goto out;
954 }
955
956 count = sp->members_count;
957
958 nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
959 if (!nodes) {
960 rv = -ENOMEM;
961 goto out;
962 }
963
964 node = nodes;
965 list_for_each_entry(nd, &sp->members, list) {
966 node->nodeid = nd->nodeid;
967 node->weight = nd->weight;
968 node->new = nd->new;
969 node->comm_seq = nd->comm_seq;
970 node++;
971
972 nd->new = 0;
973 }
974
975 *count_out = count;
976 *nodes_out = nodes;
977 rv = 0;
978 out:
979 mutex_unlock(&sp->members_lock);
980 put_space(sp);
981 return rv;
982 }
983
dlm_comm_seq(int nodeid,uint32_t * seq)984 int dlm_comm_seq(int nodeid, uint32_t *seq)
985 {
986 struct dlm_comm *cm = get_comm(nodeid);
987 if (!cm)
988 return -EEXIST;
989 *seq = cm->seq;
990 put_comm(cm);
991 return 0;
992 }
993
dlm_our_nodeid(void)994 int dlm_our_nodeid(void)
995 {
996 return local_comm ? local_comm->nodeid : 0;
997 }
998
999 /* num 0 is first addr, num 1 is second addr */
dlm_our_addr(struct sockaddr_storage * addr,int num)1000 int dlm_our_addr(struct sockaddr_storage *addr, int num)
1001 {
1002 if (!local_comm)
1003 return -1;
1004 if (num + 1 > local_comm->addr_count)
1005 return -1;
1006 memcpy(addr, local_comm->addr[num], sizeof(*addr));
1007 return 0;
1008 }
1009
1010 /* Config file defaults */
1011 #define DEFAULT_TCP_PORT 21064
1012 #define DEFAULT_BUFFER_SIZE 4096
1013 #define DEFAULT_RSBTBL_SIZE 1024
1014 #define DEFAULT_RECOVER_TIMER 5
1015 #define DEFAULT_TOSS_SECS 10
1016 #define DEFAULT_SCAN_SECS 5
1017 #define DEFAULT_LOG_DEBUG 0
1018 #define DEFAULT_PROTOCOL 0
1019 #define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */
1020 #define DEFAULT_WAITWARN_US 0
1021 #define DEFAULT_NEW_RSB_COUNT 128
1022 #define DEFAULT_RECOVER_CALLBACKS 0
1023 #define DEFAULT_CLUSTER_NAME ""
1024
1025 struct dlm_config_info dlm_config = {
1026 .ci_tcp_port = DEFAULT_TCP_PORT,
1027 .ci_buffer_size = DEFAULT_BUFFER_SIZE,
1028 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
1029 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
1030 .ci_toss_secs = DEFAULT_TOSS_SECS,
1031 .ci_scan_secs = DEFAULT_SCAN_SECS,
1032 .ci_log_debug = DEFAULT_LOG_DEBUG,
1033 .ci_protocol = DEFAULT_PROTOCOL,
1034 .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
1035 .ci_waitwarn_us = DEFAULT_WAITWARN_US,
1036 .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
1037 .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
1038 .ci_cluster_name = DEFAULT_CLUSTER_NAME
1039 };
1040
1041