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 "lowcomms.h"
24
25 /*
26 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
27 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
28 * /config/dlm/<cluster>/comms/<comm>/nodeid
29 * /config/dlm/<cluster>/comms/<comm>/local
30 * /config/dlm/<cluster>/comms/<comm>/addr (write only)
31 * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
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 static uint32_t dlm_comm_count;
39
40 struct dlm_clusters;
41 struct dlm_cluster;
42 struct dlm_spaces;
43 struct dlm_space;
44 struct dlm_comms;
45 struct dlm_comm;
46 struct dlm_nodes;
47 struct dlm_node;
48
49 static struct config_group *make_cluster(struct config_group *, const char *);
50 static void drop_cluster(struct config_group *, struct config_item *);
51 static void release_cluster(struct config_item *);
52 static struct config_group *make_space(struct config_group *, const char *);
53 static void drop_space(struct config_group *, struct config_item *);
54 static void release_space(struct config_item *);
55 static struct config_item *make_comm(struct config_group *, const char *);
56 static void drop_comm(struct config_group *, struct config_item *);
57 static void release_comm(struct config_item *);
58 static struct config_item *make_node(struct config_group *, const char *);
59 static void drop_node(struct config_group *, struct config_item *);
60 static void release_node(struct config_item *);
61
62 static struct configfs_attribute *comm_attrs[];
63 static struct configfs_attribute *node_attrs[];
64
65 struct dlm_cluster {
66 struct config_group group;
67 unsigned int cl_tcp_port;
68 unsigned int cl_buffer_size;
69 unsigned int cl_rsbtbl_size;
70 unsigned int cl_recover_timer;
71 unsigned int cl_toss_secs;
72 unsigned int cl_scan_secs;
73 unsigned int cl_log_debug;
74 unsigned int cl_log_info;
75 unsigned int cl_protocol;
76 unsigned int cl_timewarn_cs;
77 unsigned int cl_waitwarn_us;
78 unsigned int cl_new_rsb_count;
79 unsigned int cl_recover_callbacks;
80 char cl_cluster_name[DLM_LOCKSPACE_LEN];
81
82 struct dlm_spaces *sps;
83 struct dlm_comms *cms;
84 };
85
config_item_to_cluster(struct config_item * i)86 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
87 {
88 return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
89 NULL;
90 }
91
92 enum {
93 CLUSTER_ATTR_TCP_PORT = 0,
94 CLUSTER_ATTR_BUFFER_SIZE,
95 CLUSTER_ATTR_RSBTBL_SIZE,
96 CLUSTER_ATTR_RECOVER_TIMER,
97 CLUSTER_ATTR_TOSS_SECS,
98 CLUSTER_ATTR_SCAN_SECS,
99 CLUSTER_ATTR_LOG_DEBUG,
100 CLUSTER_ATTR_LOG_INFO,
101 CLUSTER_ATTR_PROTOCOL,
102 CLUSTER_ATTR_TIMEWARN_CS,
103 CLUSTER_ATTR_WAITWARN_US,
104 CLUSTER_ATTR_NEW_RSB_COUNT,
105 CLUSTER_ATTR_RECOVER_CALLBACKS,
106 CLUSTER_ATTR_CLUSTER_NAME,
107 };
108
cluster_cluster_name_show(struct config_item * item,char * buf)109 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
110 {
111 struct dlm_cluster *cl = config_item_to_cluster(item);
112 return sprintf(buf, "%s\n", cl->cl_cluster_name);
113 }
114
cluster_cluster_name_store(struct config_item * item,const char * buf,size_t len)115 static ssize_t cluster_cluster_name_store(struct config_item *item,
116 const char *buf, size_t len)
117 {
118 struct dlm_cluster *cl = config_item_to_cluster(item);
119
120 strlcpy(dlm_config.ci_cluster_name, buf,
121 sizeof(dlm_config.ci_cluster_name));
122 strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
123 return len;
124 }
125
126 CONFIGFS_ATTR(cluster_, cluster_name);
127
cluster_set(struct dlm_cluster * cl,unsigned int * cl_field,int * info_field,int check_zero,const char * buf,size_t len)128 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
129 int *info_field, int check_zero,
130 const char *buf, size_t len)
131 {
132 unsigned int x;
133 int rc;
134
135 if (!capable(CAP_SYS_ADMIN))
136 return -EPERM;
137 rc = kstrtouint(buf, 0, &x);
138 if (rc)
139 return rc;
140
141 if (check_zero && !x)
142 return -EINVAL;
143
144 *cl_field = x;
145 *info_field = x;
146
147 return len;
148 }
149
150 #define CLUSTER_ATTR(name, check_zero) \
151 static ssize_t cluster_##name##_store(struct config_item *item, \
152 const char *buf, size_t len) \
153 { \
154 struct dlm_cluster *cl = config_item_to_cluster(item); \
155 return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \
156 check_zero, buf, len); \
157 } \
158 static ssize_t cluster_##name##_show(struct config_item *item, char *buf) \
159 { \
160 struct dlm_cluster *cl = config_item_to_cluster(item); \
161 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
162 } \
163 CONFIGFS_ATTR(cluster_, name);
164
165 CLUSTER_ATTR(tcp_port, 1);
166 CLUSTER_ATTR(buffer_size, 1);
167 CLUSTER_ATTR(rsbtbl_size, 1);
168 CLUSTER_ATTR(recover_timer, 1);
169 CLUSTER_ATTR(toss_secs, 1);
170 CLUSTER_ATTR(scan_secs, 1);
171 CLUSTER_ATTR(log_debug, 0);
172 CLUSTER_ATTR(log_info, 0);
173 CLUSTER_ATTR(protocol, 0);
174 CLUSTER_ATTR(timewarn_cs, 1);
175 CLUSTER_ATTR(waitwarn_us, 0);
176 CLUSTER_ATTR(new_rsb_count, 0);
177 CLUSTER_ATTR(recover_callbacks, 0);
178
179 static struct configfs_attribute *cluster_attrs[] = {
180 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
181 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
182 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
183 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
184 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
185 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
186 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
187 [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
188 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
189 [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
190 [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
191 [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
192 [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
193 [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
194 NULL,
195 };
196
197 enum {
198 COMM_ATTR_NODEID = 0,
199 COMM_ATTR_LOCAL,
200 COMM_ATTR_ADDR,
201 COMM_ATTR_ADDR_LIST,
202 };
203
204 enum {
205 NODE_ATTR_NODEID = 0,
206 NODE_ATTR_WEIGHT,
207 };
208
209 struct dlm_clusters {
210 struct configfs_subsystem subsys;
211 };
212
213 struct dlm_spaces {
214 struct config_group ss_group;
215 };
216
217 struct dlm_space {
218 struct config_group group;
219 struct list_head members;
220 struct mutex members_lock;
221 int members_count;
222 struct dlm_nodes *nds;
223 };
224
225 struct dlm_comms {
226 struct config_group cs_group;
227 };
228
229 struct dlm_comm {
230 struct config_item item;
231 int seq;
232 int nodeid;
233 int local;
234 int addr_count;
235 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
236 };
237
238 struct dlm_nodes {
239 struct config_group ns_group;
240 };
241
242 struct dlm_node {
243 struct config_item item;
244 struct list_head list; /* space->members */
245 int nodeid;
246 int weight;
247 int new;
248 int comm_seq; /* copy of cm->seq when nd->nodeid is set */
249 };
250
251 static struct configfs_group_operations clusters_ops = {
252 .make_group = make_cluster,
253 .drop_item = drop_cluster,
254 };
255
256 static struct configfs_item_operations cluster_ops = {
257 .release = release_cluster,
258 };
259
260 static struct configfs_group_operations spaces_ops = {
261 .make_group = make_space,
262 .drop_item = drop_space,
263 };
264
265 static struct configfs_item_operations space_ops = {
266 .release = release_space,
267 };
268
269 static struct configfs_group_operations comms_ops = {
270 .make_item = make_comm,
271 .drop_item = drop_comm,
272 };
273
274 static struct configfs_item_operations comm_ops = {
275 .release = release_comm,
276 };
277
278 static struct configfs_group_operations nodes_ops = {
279 .make_item = make_node,
280 .drop_item = drop_node,
281 };
282
283 static struct configfs_item_operations node_ops = {
284 .release = release_node,
285 };
286
287 static const struct config_item_type clusters_type = {
288 .ct_group_ops = &clusters_ops,
289 .ct_owner = THIS_MODULE,
290 };
291
292 static const struct config_item_type cluster_type = {
293 .ct_item_ops = &cluster_ops,
294 .ct_attrs = cluster_attrs,
295 .ct_owner = THIS_MODULE,
296 };
297
298 static const struct config_item_type spaces_type = {
299 .ct_group_ops = &spaces_ops,
300 .ct_owner = THIS_MODULE,
301 };
302
303 static const struct config_item_type space_type = {
304 .ct_item_ops = &space_ops,
305 .ct_owner = THIS_MODULE,
306 };
307
308 static const struct config_item_type comms_type = {
309 .ct_group_ops = &comms_ops,
310 .ct_owner = THIS_MODULE,
311 };
312
313 static const struct config_item_type comm_type = {
314 .ct_item_ops = &comm_ops,
315 .ct_attrs = comm_attrs,
316 .ct_owner = THIS_MODULE,
317 };
318
319 static const struct config_item_type nodes_type = {
320 .ct_group_ops = &nodes_ops,
321 .ct_owner = THIS_MODULE,
322 };
323
324 static const struct config_item_type node_type = {
325 .ct_item_ops = &node_ops,
326 .ct_attrs = node_attrs,
327 .ct_owner = THIS_MODULE,
328 };
329
config_item_to_space(struct config_item * i)330 static struct dlm_space *config_item_to_space(struct config_item *i)
331 {
332 return i ? container_of(to_config_group(i), struct dlm_space, group) :
333 NULL;
334 }
335
config_item_to_comm(struct config_item * i)336 static struct dlm_comm *config_item_to_comm(struct config_item *i)
337 {
338 return i ? container_of(i, struct dlm_comm, item) : NULL;
339 }
340
config_item_to_node(struct config_item * i)341 static struct dlm_node *config_item_to_node(struct config_item *i)
342 {
343 return i ? container_of(i, struct dlm_node, item) : NULL;
344 }
345
make_cluster(struct config_group * g,const char * name)346 static struct config_group *make_cluster(struct config_group *g,
347 const char *name)
348 {
349 struct dlm_cluster *cl = NULL;
350 struct dlm_spaces *sps = NULL;
351 struct dlm_comms *cms = NULL;
352
353 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
354 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
355 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
356
357 if (!cl || !sps || !cms)
358 goto fail;
359
360 cl->sps = sps;
361 cl->cms = cms;
362
363 config_group_init_type_name(&cl->group, name, &cluster_type);
364 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
365 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
366
367 configfs_add_default_group(&sps->ss_group, &cl->group);
368 configfs_add_default_group(&cms->cs_group, &cl->group);
369
370 cl->cl_tcp_port = dlm_config.ci_tcp_port;
371 cl->cl_buffer_size = dlm_config.ci_buffer_size;
372 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
373 cl->cl_recover_timer = dlm_config.ci_recover_timer;
374 cl->cl_toss_secs = dlm_config.ci_toss_secs;
375 cl->cl_scan_secs = dlm_config.ci_scan_secs;
376 cl->cl_log_debug = dlm_config.ci_log_debug;
377 cl->cl_log_info = dlm_config.ci_log_info;
378 cl->cl_protocol = dlm_config.ci_protocol;
379 cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
380 cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
381 cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
382 cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
383 memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
384 DLM_LOCKSPACE_LEN);
385
386 space_list = &sps->ss_group;
387 comm_list = &cms->cs_group;
388 return &cl->group;
389
390 fail:
391 kfree(cl);
392 kfree(sps);
393 kfree(cms);
394 return ERR_PTR(-ENOMEM);
395 }
396
drop_cluster(struct config_group * g,struct config_item * i)397 static void drop_cluster(struct config_group *g, struct config_item *i)
398 {
399 struct dlm_cluster *cl = config_item_to_cluster(i);
400
401 configfs_remove_default_groups(&cl->group);
402
403 space_list = NULL;
404 comm_list = NULL;
405
406 config_item_put(i);
407 }
408
release_cluster(struct config_item * i)409 static void release_cluster(struct config_item *i)
410 {
411 struct dlm_cluster *cl = config_item_to_cluster(i);
412
413 kfree(cl->sps);
414 kfree(cl->cms);
415 kfree(cl);
416 }
417
make_space(struct config_group * g,const char * name)418 static struct config_group *make_space(struct config_group *g, const char *name)
419 {
420 struct dlm_space *sp = NULL;
421 struct dlm_nodes *nds = NULL;
422
423 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
424 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
425
426 if (!sp || !nds)
427 goto fail;
428
429 config_group_init_type_name(&sp->group, name, &space_type);
430
431 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
432 configfs_add_default_group(&nds->ns_group, &sp->group);
433
434 INIT_LIST_HEAD(&sp->members);
435 mutex_init(&sp->members_lock);
436 sp->members_count = 0;
437 sp->nds = nds;
438 return &sp->group;
439
440 fail:
441 kfree(sp);
442 kfree(nds);
443 return ERR_PTR(-ENOMEM);
444 }
445
drop_space(struct config_group * g,struct config_item * i)446 static void drop_space(struct config_group *g, struct config_item *i)
447 {
448 struct dlm_space *sp = config_item_to_space(i);
449
450 /* assert list_empty(&sp->members) */
451
452 configfs_remove_default_groups(&sp->group);
453 config_item_put(i);
454 }
455
release_space(struct config_item * i)456 static void release_space(struct config_item *i)
457 {
458 struct dlm_space *sp = config_item_to_space(i);
459 kfree(sp->nds);
460 kfree(sp);
461 }
462
make_comm(struct config_group * g,const char * name)463 static struct config_item *make_comm(struct config_group *g, const char *name)
464 {
465 struct dlm_comm *cm;
466
467 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
468 if (!cm)
469 return ERR_PTR(-ENOMEM);
470
471 config_item_init_type_name(&cm->item, name, &comm_type);
472
473 cm->seq = dlm_comm_count++;
474 if (!cm->seq)
475 cm->seq = dlm_comm_count++;
476
477 cm->nodeid = -1;
478 cm->local = 0;
479 cm->addr_count = 0;
480 return &cm->item;
481 }
482
drop_comm(struct config_group * g,struct config_item * i)483 static void drop_comm(struct config_group *g, struct config_item *i)
484 {
485 struct dlm_comm *cm = config_item_to_comm(i);
486 if (local_comm == cm)
487 local_comm = NULL;
488 dlm_lowcomms_close(cm->nodeid);
489 while (cm->addr_count--)
490 kfree(cm->addr[cm->addr_count]);
491 config_item_put(i);
492 }
493
release_comm(struct config_item * i)494 static void release_comm(struct config_item *i)
495 {
496 struct dlm_comm *cm = config_item_to_comm(i);
497 kfree(cm);
498 }
499
make_node(struct config_group * g,const char * name)500 static struct config_item *make_node(struct config_group *g, const char *name)
501 {
502 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
503 struct dlm_node *nd;
504
505 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
506 if (!nd)
507 return ERR_PTR(-ENOMEM);
508
509 config_item_init_type_name(&nd->item, name, &node_type);
510 nd->nodeid = -1;
511 nd->weight = 1; /* default weight of 1 if none is set */
512 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
513
514 mutex_lock(&sp->members_lock);
515 list_add(&nd->list, &sp->members);
516 sp->members_count++;
517 mutex_unlock(&sp->members_lock);
518
519 return &nd->item;
520 }
521
drop_node(struct config_group * g,struct config_item * i)522 static void drop_node(struct config_group *g, struct config_item *i)
523 {
524 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
525 struct dlm_node *nd = config_item_to_node(i);
526
527 mutex_lock(&sp->members_lock);
528 list_del(&nd->list);
529 sp->members_count--;
530 mutex_unlock(&sp->members_lock);
531
532 config_item_put(i);
533 }
534
release_node(struct config_item * i)535 static void release_node(struct config_item *i)
536 {
537 struct dlm_node *nd = config_item_to_node(i);
538 kfree(nd);
539 }
540
541 static struct dlm_clusters clusters_root = {
542 .subsys = {
543 .su_group = {
544 .cg_item = {
545 .ci_namebuf = "dlm",
546 .ci_type = &clusters_type,
547 },
548 },
549 },
550 };
551
dlm_config_init(void)552 int __init dlm_config_init(void)
553 {
554 config_group_init(&clusters_root.subsys.su_group);
555 mutex_init(&clusters_root.subsys.su_mutex);
556 return configfs_register_subsystem(&clusters_root.subsys);
557 }
558
dlm_config_exit(void)559 void dlm_config_exit(void)
560 {
561 configfs_unregister_subsystem(&clusters_root.subsys);
562 }
563
564 /*
565 * Functions for user space to read/write attributes
566 */
567
comm_nodeid_show(struct config_item * item,char * buf)568 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
569 {
570 return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
571 }
572
comm_nodeid_store(struct config_item * item,const char * buf,size_t len)573 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
574 size_t len)
575 {
576 int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
577
578 if (rc)
579 return rc;
580 return len;
581 }
582
comm_local_show(struct config_item * item,char * buf)583 static ssize_t comm_local_show(struct config_item *item, char *buf)
584 {
585 return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
586 }
587
comm_local_store(struct config_item * item,const char * buf,size_t len)588 static ssize_t comm_local_store(struct config_item *item, const char *buf,
589 size_t len)
590 {
591 struct dlm_comm *cm = config_item_to_comm(item);
592 int rc = kstrtoint(buf, 0, &cm->local);
593
594 if (rc)
595 return rc;
596 if (cm->local && !local_comm)
597 local_comm = cm;
598 return len;
599 }
600
comm_addr_store(struct config_item * item,const char * buf,size_t len)601 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
602 size_t len)
603 {
604 struct dlm_comm *cm = config_item_to_comm(item);
605 struct sockaddr_storage *addr;
606 int rv;
607
608 if (len != sizeof(struct sockaddr_storage))
609 return -EINVAL;
610
611 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
612 return -ENOSPC;
613
614 addr = kzalloc(sizeof(*addr), GFP_NOFS);
615 if (!addr)
616 return -ENOMEM;
617
618 memcpy(addr, buf, len);
619
620 rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
621 if (rv) {
622 kfree(addr);
623 return rv;
624 }
625
626 cm->addr[cm->addr_count++] = addr;
627 return len;
628 }
629
comm_addr_list_show(struct config_item * item,char * buf)630 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
631 {
632 struct dlm_comm *cm = config_item_to_comm(item);
633 ssize_t s;
634 ssize_t allowance;
635 int i;
636 struct sockaddr_storage *addr;
637 struct sockaddr_in *addr_in;
638 struct sockaddr_in6 *addr_in6;
639
640 /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
641 char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
642
643
644 /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
645 allowance = 4096;
646 buf[0] = '\0';
647
648 for (i = 0; i < cm->addr_count; i++) {
649 addr = cm->addr[i];
650
651 switch(addr->ss_family) {
652 case AF_INET:
653 addr_in = (struct sockaddr_in *)addr;
654 s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr);
655 break;
656 case AF_INET6:
657 addr_in6 = (struct sockaddr_in6 *)addr;
658 s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr);
659 break;
660 default:
661 s = sprintf(buf0, "%s\n", "<UNKNOWN>");
662 break;
663 }
664 allowance -= s;
665 if (allowance >= 0)
666 strcat(buf, buf0);
667 else {
668 allowance += s;
669 break;
670 }
671 }
672 return 4096 - allowance;
673 }
674
675 CONFIGFS_ATTR(comm_, nodeid);
676 CONFIGFS_ATTR(comm_, local);
677 CONFIGFS_ATTR_WO(comm_, addr);
678 CONFIGFS_ATTR_RO(comm_, addr_list);
679
680 static struct configfs_attribute *comm_attrs[] = {
681 [COMM_ATTR_NODEID] = &comm_attr_nodeid,
682 [COMM_ATTR_LOCAL] = &comm_attr_local,
683 [COMM_ATTR_ADDR] = &comm_attr_addr,
684 [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
685 NULL,
686 };
687
node_nodeid_show(struct config_item * item,char * buf)688 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
689 {
690 return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
691 }
692
node_nodeid_store(struct config_item * item,const char * buf,size_t len)693 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
694 size_t len)
695 {
696 struct dlm_node *nd = config_item_to_node(item);
697 uint32_t seq = 0;
698 int rc = kstrtoint(buf, 0, &nd->nodeid);
699
700 if (rc)
701 return rc;
702 dlm_comm_seq(nd->nodeid, &seq);
703 nd->comm_seq = seq;
704 return len;
705 }
706
node_weight_show(struct config_item * item,char * buf)707 static ssize_t node_weight_show(struct config_item *item, char *buf)
708 {
709 return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
710 }
711
node_weight_store(struct config_item * item,const char * buf,size_t len)712 static ssize_t node_weight_store(struct config_item *item, const char *buf,
713 size_t len)
714 {
715 int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
716
717 if (rc)
718 return rc;
719 return len;
720 }
721
722 CONFIGFS_ATTR(node_, nodeid);
723 CONFIGFS_ATTR(node_, weight);
724
725 static struct configfs_attribute *node_attrs[] = {
726 [NODE_ATTR_NODEID] = &node_attr_nodeid,
727 [NODE_ATTR_WEIGHT] = &node_attr_weight,
728 NULL,
729 };
730
731 /*
732 * Functions for the dlm to get the info that's been configured
733 */
734
get_space(char * name)735 static struct dlm_space *get_space(char *name)
736 {
737 struct config_item *i;
738
739 if (!space_list)
740 return NULL;
741
742 mutex_lock(&space_list->cg_subsys->su_mutex);
743 i = config_group_find_item(space_list, name);
744 mutex_unlock(&space_list->cg_subsys->su_mutex);
745
746 return config_item_to_space(i);
747 }
748
put_space(struct dlm_space * sp)749 static void put_space(struct dlm_space *sp)
750 {
751 config_item_put(&sp->group.cg_item);
752 }
753
get_comm(int nodeid)754 static struct dlm_comm *get_comm(int nodeid)
755 {
756 struct config_item *i;
757 struct dlm_comm *cm = NULL;
758 int found = 0;
759
760 if (!comm_list)
761 return NULL;
762
763 mutex_lock(&clusters_root.subsys.su_mutex);
764
765 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
766 cm = config_item_to_comm(i);
767
768 if (cm->nodeid != nodeid)
769 continue;
770 found = 1;
771 config_item_get(i);
772 break;
773 }
774 mutex_unlock(&clusters_root.subsys.su_mutex);
775
776 if (!found)
777 cm = NULL;
778 return cm;
779 }
780
put_comm(struct dlm_comm * cm)781 static void put_comm(struct dlm_comm *cm)
782 {
783 config_item_put(&cm->item);
784 }
785
786 /* caller must free mem */
dlm_config_nodes(char * lsname,struct dlm_config_node ** nodes_out,int * count_out)787 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
788 int *count_out)
789 {
790 struct dlm_space *sp;
791 struct dlm_node *nd;
792 struct dlm_config_node *nodes, *node;
793 int rv, count;
794
795 sp = get_space(lsname);
796 if (!sp)
797 return -EEXIST;
798
799 mutex_lock(&sp->members_lock);
800 if (!sp->members_count) {
801 rv = -EINVAL;
802 printk(KERN_ERR "dlm: zero members_count\n");
803 goto out;
804 }
805
806 count = sp->members_count;
807
808 nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
809 if (!nodes) {
810 rv = -ENOMEM;
811 goto out;
812 }
813
814 node = nodes;
815 list_for_each_entry(nd, &sp->members, list) {
816 node->nodeid = nd->nodeid;
817 node->weight = nd->weight;
818 node->new = nd->new;
819 node->comm_seq = nd->comm_seq;
820 node++;
821
822 nd->new = 0;
823 }
824
825 *count_out = count;
826 *nodes_out = nodes;
827 rv = 0;
828 out:
829 mutex_unlock(&sp->members_lock);
830 put_space(sp);
831 return rv;
832 }
833
dlm_comm_seq(int nodeid,uint32_t * seq)834 int dlm_comm_seq(int nodeid, uint32_t *seq)
835 {
836 struct dlm_comm *cm = get_comm(nodeid);
837 if (!cm)
838 return -EEXIST;
839 *seq = cm->seq;
840 put_comm(cm);
841 return 0;
842 }
843
dlm_our_nodeid(void)844 int dlm_our_nodeid(void)
845 {
846 return local_comm ? local_comm->nodeid : 0;
847 }
848
849 /* num 0 is first addr, num 1 is second addr */
dlm_our_addr(struct sockaddr_storage * addr,int num)850 int dlm_our_addr(struct sockaddr_storage *addr, int num)
851 {
852 if (!local_comm)
853 return -1;
854 if (num + 1 > local_comm->addr_count)
855 return -1;
856 memcpy(addr, local_comm->addr[num], sizeof(*addr));
857 return 0;
858 }
859
860 /* Config file defaults */
861 #define DEFAULT_TCP_PORT 21064
862 #define DEFAULT_BUFFER_SIZE 4096
863 #define DEFAULT_RSBTBL_SIZE 1024
864 #define DEFAULT_RECOVER_TIMER 5
865 #define DEFAULT_TOSS_SECS 10
866 #define DEFAULT_SCAN_SECS 5
867 #define DEFAULT_LOG_DEBUG 0
868 #define DEFAULT_LOG_INFO 1
869 #define DEFAULT_PROTOCOL 0
870 #define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */
871 #define DEFAULT_WAITWARN_US 0
872 #define DEFAULT_NEW_RSB_COUNT 128
873 #define DEFAULT_RECOVER_CALLBACKS 0
874 #define DEFAULT_CLUSTER_NAME ""
875
876 struct dlm_config_info dlm_config = {
877 .ci_tcp_port = DEFAULT_TCP_PORT,
878 .ci_buffer_size = DEFAULT_BUFFER_SIZE,
879 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
880 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
881 .ci_toss_secs = DEFAULT_TOSS_SECS,
882 .ci_scan_secs = DEFAULT_SCAN_SECS,
883 .ci_log_debug = DEFAULT_LOG_DEBUG,
884 .ci_log_info = DEFAULT_LOG_INFO,
885 .ci_protocol = DEFAULT_PROTOCOL,
886 .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
887 .ci_waitwarn_us = DEFAULT_WAITWARN_US,
888 .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
889 .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
890 .ci_cluster_name = DEFAULT_CLUSTER_NAME
891 };
892
893