xref: /openbmc/linux/fs/dlm/config.c (revision 11788d9b)
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_mark;
77 	unsigned int cl_timewarn_cs;
78 	unsigned int cl_waitwarn_us;
79 	unsigned int cl_new_rsb_count;
80 	unsigned int cl_recover_callbacks;
81 	char cl_cluster_name[DLM_LOCKSPACE_LEN];
82 };
83 
84 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
85 {
86 	return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
87 		   NULL;
88 }
89 
90 enum {
91 	CLUSTER_ATTR_TCP_PORT = 0,
92 	CLUSTER_ATTR_BUFFER_SIZE,
93 	CLUSTER_ATTR_RSBTBL_SIZE,
94 	CLUSTER_ATTR_RECOVER_TIMER,
95 	CLUSTER_ATTR_TOSS_SECS,
96 	CLUSTER_ATTR_SCAN_SECS,
97 	CLUSTER_ATTR_LOG_DEBUG,
98 	CLUSTER_ATTR_LOG_INFO,
99 	CLUSTER_ATTR_PROTOCOL,
100 	CLUSTER_ATTR_MARK,
101 	CLUSTER_ATTR_TIMEWARN_CS,
102 	CLUSTER_ATTR_WAITWARN_US,
103 	CLUSTER_ATTR_NEW_RSB_COUNT,
104 	CLUSTER_ATTR_RECOVER_CALLBACKS,
105 	CLUSTER_ATTR_CLUSTER_NAME,
106 };
107 
108 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
109 {
110 	struct dlm_cluster *cl = config_item_to_cluster(item);
111 	return sprintf(buf, "%s\n", cl->cl_cluster_name);
112 }
113 
114 static ssize_t cluster_cluster_name_store(struct config_item *item,
115 					  const char *buf, size_t len)
116 {
117 	struct dlm_cluster *cl = config_item_to_cluster(item);
118 
119 	strlcpy(dlm_config.ci_cluster_name, buf,
120 				sizeof(dlm_config.ci_cluster_name));
121 	strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
122 	return len;
123 }
124 
125 CONFIGFS_ATTR(cluster_, cluster_name);
126 
127 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
128 			   int *info_field, int check_zero,
129 			   const char *buf, size_t len)
130 {
131 	unsigned int x;
132 	int rc;
133 
134 	if (!capable(CAP_SYS_ADMIN))
135 		return -EPERM;
136 	rc = kstrtouint(buf, 0, &x);
137 	if (rc)
138 		return rc;
139 
140 	if (check_zero && !x)
141 		return -EINVAL;
142 
143 	*cl_field = x;
144 	*info_field = x;
145 
146 	return len;
147 }
148 
149 #define CLUSTER_ATTR(name, check_zero)                                        \
150 static ssize_t cluster_##name##_store(struct config_item *item, \
151 		const char *buf, size_t len) \
152 {                                                                             \
153 	struct dlm_cluster *cl = config_item_to_cluster(item);		      \
154 	return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
155 			   check_zero, buf, len);                             \
156 }                                                                             \
157 static ssize_t cluster_##name##_show(struct config_item *item, char *buf)     \
158 {                                                                             \
159 	struct dlm_cluster *cl = config_item_to_cluster(item);		      \
160 	return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
161 }                                                                             \
162 CONFIGFS_ATTR(cluster_, name);
163 
164 CLUSTER_ATTR(tcp_port, 1);
165 CLUSTER_ATTR(buffer_size, 1);
166 CLUSTER_ATTR(rsbtbl_size, 1);
167 CLUSTER_ATTR(recover_timer, 1);
168 CLUSTER_ATTR(toss_secs, 1);
169 CLUSTER_ATTR(scan_secs, 1);
170 CLUSTER_ATTR(log_debug, 0);
171 CLUSTER_ATTR(log_info, 0);
172 CLUSTER_ATTR(protocol, 0);
173 CLUSTER_ATTR(mark, 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_MARK] = &cluster_attr_mark,
190 	[CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
191 	[CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
192 	[CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
193 	[CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
194 	[CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
195 	NULL,
196 };
197 
198 enum {
199 	COMM_ATTR_NODEID = 0,
200 	COMM_ATTR_LOCAL,
201 	COMM_ATTR_ADDR,
202 	COMM_ATTR_ADDR_LIST,
203 	COMM_ATTR_MARK,
204 };
205 
206 enum {
207 	NODE_ATTR_NODEID = 0,
208 	NODE_ATTR_WEIGHT,
209 };
210 
211 struct dlm_clusters {
212 	struct configfs_subsystem subsys;
213 };
214 
215 struct dlm_spaces {
216 	struct config_group ss_group;
217 };
218 
219 struct dlm_space {
220 	struct config_group group;
221 	struct list_head members;
222 	struct mutex members_lock;
223 	int members_count;
224 };
225 
226 struct dlm_comms {
227 	struct config_group cs_group;
228 };
229 
230 struct dlm_comm {
231 	struct config_item item;
232 	int seq;
233 	int nodeid;
234 	int local;
235 	int addr_count;
236 	unsigned int mark;
237 	struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
238 };
239 
240 struct dlm_nodes {
241 	struct config_group ns_group;
242 };
243 
244 struct dlm_node {
245 	struct config_item item;
246 	struct list_head list; /* space->members */
247 	int nodeid;
248 	int weight;
249 	int new;
250 	int comm_seq; /* copy of cm->seq when nd->nodeid is set */
251 };
252 
253 static struct configfs_group_operations clusters_ops = {
254 	.make_group = make_cluster,
255 	.drop_item = drop_cluster,
256 };
257 
258 static struct configfs_item_operations cluster_ops = {
259 	.release = release_cluster,
260 };
261 
262 static struct configfs_group_operations spaces_ops = {
263 	.make_group = make_space,
264 	.drop_item = drop_space,
265 };
266 
267 static struct configfs_item_operations space_ops = {
268 	.release = release_space,
269 };
270 
271 static struct configfs_group_operations comms_ops = {
272 	.make_item = make_comm,
273 	.drop_item = drop_comm,
274 };
275 
276 static struct configfs_item_operations comm_ops = {
277 	.release = release_comm,
278 };
279 
280 static struct configfs_group_operations nodes_ops = {
281 	.make_item = make_node,
282 	.drop_item = drop_node,
283 };
284 
285 static struct configfs_item_operations node_ops = {
286 	.release = release_node,
287 };
288 
289 static const struct config_item_type clusters_type = {
290 	.ct_group_ops = &clusters_ops,
291 	.ct_owner = THIS_MODULE,
292 };
293 
294 static const struct config_item_type cluster_type = {
295 	.ct_item_ops = &cluster_ops,
296 	.ct_attrs = cluster_attrs,
297 	.ct_owner = THIS_MODULE,
298 };
299 
300 static const struct config_item_type spaces_type = {
301 	.ct_group_ops = &spaces_ops,
302 	.ct_owner = THIS_MODULE,
303 };
304 
305 static const struct config_item_type space_type = {
306 	.ct_item_ops = &space_ops,
307 	.ct_owner = THIS_MODULE,
308 };
309 
310 static const struct config_item_type comms_type = {
311 	.ct_group_ops = &comms_ops,
312 	.ct_owner = THIS_MODULE,
313 };
314 
315 static const struct config_item_type comm_type = {
316 	.ct_item_ops = &comm_ops,
317 	.ct_attrs = comm_attrs,
318 	.ct_owner = THIS_MODULE,
319 };
320 
321 static const struct config_item_type nodes_type = {
322 	.ct_group_ops = &nodes_ops,
323 	.ct_owner = THIS_MODULE,
324 };
325 
326 static const struct config_item_type node_type = {
327 	.ct_item_ops = &node_ops,
328 	.ct_attrs = node_attrs,
329 	.ct_owner = THIS_MODULE,
330 };
331 
332 static struct dlm_space *config_item_to_space(struct config_item *i)
333 {
334 	return i ? container_of(to_config_group(i), struct dlm_space, group) :
335 		   NULL;
336 }
337 
338 static struct dlm_comm *config_item_to_comm(struct config_item *i)
339 {
340 	return i ? container_of(i, struct dlm_comm, item) : NULL;
341 }
342 
343 static struct dlm_node *config_item_to_node(struct config_item *i)
344 {
345 	return i ? container_of(i, struct dlm_node, item) : NULL;
346 }
347 
348 static struct config_group *make_cluster(struct config_group *g,
349 					 const char *name)
350 {
351 	struct dlm_cluster *cl = NULL;
352 	struct dlm_spaces *sps = NULL;
353 	struct dlm_comms *cms = NULL;
354 
355 	cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
356 	sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
357 	cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
358 
359 	if (!cl || !sps || !cms)
360 		goto fail;
361 
362 	config_group_init_type_name(&cl->group, name, &cluster_type);
363 	config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
364 	config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
365 
366 	configfs_add_default_group(&sps->ss_group, &cl->group);
367 	configfs_add_default_group(&cms->cs_group, &cl->group);
368 
369 	cl->cl_tcp_port = dlm_config.ci_tcp_port;
370 	cl->cl_buffer_size = dlm_config.ci_buffer_size;
371 	cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
372 	cl->cl_recover_timer = dlm_config.ci_recover_timer;
373 	cl->cl_toss_secs = dlm_config.ci_toss_secs;
374 	cl->cl_scan_secs = dlm_config.ci_scan_secs;
375 	cl->cl_log_debug = dlm_config.ci_log_debug;
376 	cl->cl_log_info = dlm_config.ci_log_info;
377 	cl->cl_protocol = dlm_config.ci_protocol;
378 	cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
379 	cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
380 	cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
381 	cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
382 	memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
383 	       DLM_LOCKSPACE_LEN);
384 
385 	space_list = &sps->ss_group;
386 	comm_list = &cms->cs_group;
387 	return &cl->group;
388 
389  fail:
390 	kfree(cl);
391 	kfree(sps);
392 	kfree(cms);
393 	return ERR_PTR(-ENOMEM);
394 }
395 
396 static void drop_cluster(struct config_group *g, struct config_item *i)
397 {
398 	struct dlm_cluster *cl = config_item_to_cluster(i);
399 
400 	configfs_remove_default_groups(&cl->group);
401 
402 	space_list = NULL;
403 	comm_list = NULL;
404 
405 	config_item_put(i);
406 }
407 
408 static void release_cluster(struct config_item *i)
409 {
410 	struct dlm_cluster *cl = config_item_to_cluster(i);
411 	kfree(cl);
412 }
413 
414 static struct config_group *make_space(struct config_group *g, const char *name)
415 {
416 	struct dlm_space *sp = NULL;
417 	struct dlm_nodes *nds = NULL;
418 
419 	sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
420 	nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
421 
422 	if (!sp || !nds)
423 		goto fail;
424 
425 	config_group_init_type_name(&sp->group, name, &space_type);
426 
427 	config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
428 	configfs_add_default_group(&nds->ns_group, &sp->group);
429 
430 	INIT_LIST_HEAD(&sp->members);
431 	mutex_init(&sp->members_lock);
432 	sp->members_count = 0;
433 	return &sp->group;
434 
435  fail:
436 	kfree(sp);
437 	kfree(nds);
438 	return ERR_PTR(-ENOMEM);
439 }
440 
441 static void drop_space(struct config_group *g, struct config_item *i)
442 {
443 	struct dlm_space *sp = config_item_to_space(i);
444 
445 	/* assert list_empty(&sp->members) */
446 
447 	configfs_remove_default_groups(&sp->group);
448 	config_item_put(i);
449 }
450 
451 static void release_space(struct config_item *i)
452 {
453 	struct dlm_space *sp = config_item_to_space(i);
454 	kfree(sp);
455 }
456 
457 static struct config_item *make_comm(struct config_group *g, const char *name)
458 {
459 	struct dlm_comm *cm;
460 
461 	cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
462 	if (!cm)
463 		return ERR_PTR(-ENOMEM);
464 
465 	config_item_init_type_name(&cm->item, name, &comm_type);
466 
467 	cm->seq = dlm_comm_count++;
468 	if (!cm->seq)
469 		cm->seq = dlm_comm_count++;
470 
471 	cm->nodeid = -1;
472 	cm->local = 0;
473 	cm->addr_count = 0;
474 	cm->mark = 0;
475 	return &cm->item;
476 }
477 
478 static void drop_comm(struct config_group *g, struct config_item *i)
479 {
480 	struct dlm_comm *cm = config_item_to_comm(i);
481 	if (local_comm == cm)
482 		local_comm = NULL;
483 	dlm_lowcomms_close(cm->nodeid);
484 	while (cm->addr_count--)
485 		kfree(cm->addr[cm->addr_count]);
486 	config_item_put(i);
487 }
488 
489 static void release_comm(struct config_item *i)
490 {
491 	struct dlm_comm *cm = config_item_to_comm(i);
492 	kfree(cm);
493 }
494 
495 static struct config_item *make_node(struct config_group *g, const char *name)
496 {
497 	struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
498 	struct dlm_node *nd;
499 
500 	nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
501 	if (!nd)
502 		return ERR_PTR(-ENOMEM);
503 
504 	config_item_init_type_name(&nd->item, name, &node_type);
505 	nd->nodeid = -1;
506 	nd->weight = 1;  /* default weight of 1 if none is set */
507 	nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
508 
509 	mutex_lock(&sp->members_lock);
510 	list_add(&nd->list, &sp->members);
511 	sp->members_count++;
512 	mutex_unlock(&sp->members_lock);
513 
514 	return &nd->item;
515 }
516 
517 static void drop_node(struct config_group *g, struct config_item *i)
518 {
519 	struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
520 	struct dlm_node *nd = config_item_to_node(i);
521 
522 	mutex_lock(&sp->members_lock);
523 	list_del(&nd->list);
524 	sp->members_count--;
525 	mutex_unlock(&sp->members_lock);
526 
527 	config_item_put(i);
528 }
529 
530 static void release_node(struct config_item *i)
531 {
532 	struct dlm_node *nd = config_item_to_node(i);
533 	kfree(nd);
534 }
535 
536 static struct dlm_clusters clusters_root = {
537 	.subsys = {
538 		.su_group = {
539 			.cg_item = {
540 				.ci_namebuf = "dlm",
541 				.ci_type = &clusters_type,
542 			},
543 		},
544 	},
545 };
546 
547 int __init dlm_config_init(void)
548 {
549 	config_group_init(&clusters_root.subsys.su_group);
550 	mutex_init(&clusters_root.subsys.su_mutex);
551 	return configfs_register_subsystem(&clusters_root.subsys);
552 }
553 
554 void dlm_config_exit(void)
555 {
556 	configfs_unregister_subsystem(&clusters_root.subsys);
557 }
558 
559 /*
560  * Functions for user space to read/write attributes
561  */
562 
563 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
564 {
565 	return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
566 }
567 
568 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
569 				 size_t len)
570 {
571 	int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
572 
573 	if (rc)
574 		return rc;
575 	return len;
576 }
577 
578 static ssize_t comm_local_show(struct config_item *item, char *buf)
579 {
580 	return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
581 }
582 
583 static ssize_t comm_local_store(struct config_item *item, const char *buf,
584 				size_t len)
585 {
586 	struct dlm_comm *cm = config_item_to_comm(item);
587 	int rc = kstrtoint(buf, 0, &cm->local);
588 
589 	if (rc)
590 		return rc;
591 	if (cm->local && !local_comm)
592 		local_comm = cm;
593 	return len;
594 }
595 
596 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
597 		size_t len)
598 {
599 	struct dlm_comm *cm = config_item_to_comm(item);
600 	struct sockaddr_storage *addr;
601 	int rv;
602 
603 	if (len != sizeof(struct sockaddr_storage))
604 		return -EINVAL;
605 
606 	if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
607 		return -ENOSPC;
608 
609 	addr = kzalloc(sizeof(*addr), GFP_NOFS);
610 	if (!addr)
611 		return -ENOMEM;
612 
613 	memcpy(addr, buf, len);
614 
615 	rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
616 	if (rv) {
617 		kfree(addr);
618 		return rv;
619 	}
620 
621 	cm->addr[cm->addr_count++] = addr;
622 	return len;
623 }
624 
625 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
626 {
627 	struct dlm_comm *cm = config_item_to_comm(item);
628 	ssize_t s;
629 	ssize_t allowance;
630 	int i;
631 	struct sockaddr_storage *addr;
632 	struct sockaddr_in *addr_in;
633 	struct sockaddr_in6 *addr_in6;
634 
635 	/* Taken from ip6_addr_string() defined in lib/vsprintf.c */
636 	char buf0[sizeof("AF_INET6	xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
637 
638 
639 	/* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
640 	allowance = 4096;
641 	buf[0] = '\0';
642 
643 	for (i = 0; i < cm->addr_count; i++) {
644 		addr = cm->addr[i];
645 
646 		switch(addr->ss_family) {
647 		case AF_INET:
648 			addr_in = (struct sockaddr_in *)addr;
649 			s = sprintf(buf0, "AF_INET	%pI4\n", &addr_in->sin_addr.s_addr);
650 			break;
651 		case AF_INET6:
652 			addr_in6 = (struct sockaddr_in6 *)addr;
653 			s = sprintf(buf0, "AF_INET6	%pI6\n", &addr_in6->sin6_addr);
654 			break;
655 		default:
656 			s = sprintf(buf0, "%s\n", "<UNKNOWN>");
657 			break;
658 		}
659 		allowance -= s;
660 		if (allowance >= 0)
661 			strcat(buf, buf0);
662 		else {
663 			allowance += s;
664 			break;
665 		}
666 	}
667 	return 4096 - allowance;
668 }
669 
670 static ssize_t comm_mark_show(struct config_item *item, char *buf)
671 {
672 	return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
673 }
674 
675 static ssize_t comm_mark_store(struct config_item *item, const char *buf,
676 			       size_t len)
677 {
678 	unsigned int mark;
679 	int rc;
680 
681 	rc = kstrtouint(buf, 0, &mark);
682 	if (rc)
683 		return rc;
684 
685 	config_item_to_comm(item)->mark = mark;
686 	return len;
687 }
688 
689 CONFIGFS_ATTR(comm_, nodeid);
690 CONFIGFS_ATTR(comm_, local);
691 CONFIGFS_ATTR(comm_, mark);
692 CONFIGFS_ATTR_WO(comm_, addr);
693 CONFIGFS_ATTR_RO(comm_, addr_list);
694 
695 static struct configfs_attribute *comm_attrs[] = {
696 	[COMM_ATTR_NODEID] = &comm_attr_nodeid,
697 	[COMM_ATTR_LOCAL] = &comm_attr_local,
698 	[COMM_ATTR_ADDR] = &comm_attr_addr,
699 	[COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
700 	[COMM_ATTR_MARK] = &comm_attr_mark,
701 	NULL,
702 };
703 
704 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
705 {
706 	return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
707 }
708 
709 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
710 				 size_t len)
711 {
712 	struct dlm_node *nd = config_item_to_node(item);
713 	uint32_t seq = 0;
714 	int rc = kstrtoint(buf, 0, &nd->nodeid);
715 
716 	if (rc)
717 		return rc;
718 	dlm_comm_seq(nd->nodeid, &seq);
719 	nd->comm_seq = seq;
720 	return len;
721 }
722 
723 static ssize_t node_weight_show(struct config_item *item, char *buf)
724 {
725 	return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
726 }
727 
728 static ssize_t node_weight_store(struct config_item *item, const char *buf,
729 				 size_t len)
730 {
731 	int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
732 
733 	if (rc)
734 		return rc;
735 	return len;
736 }
737 
738 CONFIGFS_ATTR(node_, nodeid);
739 CONFIGFS_ATTR(node_, weight);
740 
741 static struct configfs_attribute *node_attrs[] = {
742 	[NODE_ATTR_NODEID] = &node_attr_nodeid,
743 	[NODE_ATTR_WEIGHT] = &node_attr_weight,
744 	NULL,
745 };
746 
747 /*
748  * Functions for the dlm to get the info that's been configured
749  */
750 
751 static struct dlm_space *get_space(char *name)
752 {
753 	struct config_item *i;
754 
755 	if (!space_list)
756 		return NULL;
757 
758 	mutex_lock(&space_list->cg_subsys->su_mutex);
759 	i = config_group_find_item(space_list, name);
760 	mutex_unlock(&space_list->cg_subsys->su_mutex);
761 
762 	return config_item_to_space(i);
763 }
764 
765 static void put_space(struct dlm_space *sp)
766 {
767 	config_item_put(&sp->group.cg_item);
768 }
769 
770 static struct dlm_comm *get_comm(int nodeid)
771 {
772 	struct config_item *i;
773 	struct dlm_comm *cm = NULL;
774 	int found = 0;
775 
776 	if (!comm_list)
777 		return NULL;
778 
779 	mutex_lock(&clusters_root.subsys.su_mutex);
780 
781 	list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
782 		cm = config_item_to_comm(i);
783 
784 		if (cm->nodeid != nodeid)
785 			continue;
786 		found = 1;
787 		config_item_get(i);
788 		break;
789 	}
790 	mutex_unlock(&clusters_root.subsys.su_mutex);
791 
792 	if (!found)
793 		cm = NULL;
794 	return cm;
795 }
796 
797 static void put_comm(struct dlm_comm *cm)
798 {
799 	config_item_put(&cm->item);
800 }
801 
802 /* caller must free mem */
803 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
804 		     int *count_out)
805 {
806 	struct dlm_space *sp;
807 	struct dlm_node *nd;
808 	struct dlm_config_node *nodes, *node;
809 	int rv, count;
810 
811 	sp = get_space(lsname);
812 	if (!sp)
813 		return -EEXIST;
814 
815 	mutex_lock(&sp->members_lock);
816 	if (!sp->members_count) {
817 		rv = -EINVAL;
818 		printk(KERN_ERR "dlm: zero members_count\n");
819 		goto out;
820 	}
821 
822 	count = sp->members_count;
823 
824 	nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
825 	if (!nodes) {
826 		rv = -ENOMEM;
827 		goto out;
828 	}
829 
830 	node = nodes;
831 	list_for_each_entry(nd, &sp->members, list) {
832 		node->nodeid = nd->nodeid;
833 		node->weight = nd->weight;
834 		node->new = nd->new;
835 		node->comm_seq = nd->comm_seq;
836 		node++;
837 
838 		nd->new = 0;
839 	}
840 
841 	*count_out = count;
842 	*nodes_out = nodes;
843 	rv = 0;
844  out:
845 	mutex_unlock(&sp->members_lock);
846 	put_space(sp);
847 	return rv;
848 }
849 
850 int dlm_comm_seq(int nodeid, uint32_t *seq)
851 {
852 	struct dlm_comm *cm = get_comm(nodeid);
853 	if (!cm)
854 		return -EEXIST;
855 	*seq = cm->seq;
856 	put_comm(cm);
857 	return 0;
858 }
859 
860 int dlm_comm_mark(int nodeid, unsigned int *mark)
861 {
862 	struct dlm_comm *cm;
863 
864 	cm = get_comm(nodeid);
865 	if (!cm)
866 		return -ENOENT;
867 
868 	*mark = cm->mark;
869 	put_comm(cm);
870 
871 	return 0;
872 }
873 
874 int dlm_our_nodeid(void)
875 {
876 	return local_comm ? local_comm->nodeid : 0;
877 }
878 
879 /* num 0 is first addr, num 1 is second addr */
880 int dlm_our_addr(struct sockaddr_storage *addr, int num)
881 {
882 	if (!local_comm)
883 		return -1;
884 	if (num + 1 > local_comm->addr_count)
885 		return -1;
886 	memcpy(addr, local_comm->addr[num], sizeof(*addr));
887 	return 0;
888 }
889 
890 /* Config file defaults */
891 #define DEFAULT_TCP_PORT       21064
892 #define DEFAULT_BUFFER_SIZE     4096
893 #define DEFAULT_RSBTBL_SIZE     1024
894 #define DEFAULT_RECOVER_TIMER      5
895 #define DEFAULT_TOSS_SECS         10
896 #define DEFAULT_SCAN_SECS          5
897 #define DEFAULT_LOG_DEBUG          0
898 #define DEFAULT_LOG_INFO           1
899 #define DEFAULT_PROTOCOL           0
900 #define DEFAULT_MARK               0
901 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
902 #define DEFAULT_WAITWARN_US	   0
903 #define DEFAULT_NEW_RSB_COUNT    128
904 #define DEFAULT_RECOVER_CALLBACKS  0
905 #define DEFAULT_CLUSTER_NAME      ""
906 
907 struct dlm_config_info dlm_config = {
908 	.ci_tcp_port = DEFAULT_TCP_PORT,
909 	.ci_buffer_size = DEFAULT_BUFFER_SIZE,
910 	.ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
911 	.ci_recover_timer = DEFAULT_RECOVER_TIMER,
912 	.ci_toss_secs = DEFAULT_TOSS_SECS,
913 	.ci_scan_secs = DEFAULT_SCAN_SECS,
914 	.ci_log_debug = DEFAULT_LOG_DEBUG,
915 	.ci_log_info = DEFAULT_LOG_INFO,
916 	.ci_protocol = DEFAULT_PROTOCOL,
917 	.ci_mark = DEFAULT_MARK,
918 	.ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
919 	.ci_waitwarn_us = DEFAULT_WAITWARN_US,
920 	.ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
921 	.ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
922 	.ci_cluster_name = DEFAULT_CLUSTER_NAME
923 };
924 
925