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 "midcomms.h"
24 #include "lowcomms.h"
25 
26 /*
27  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
28  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
29  * /config/dlm/<cluster>/comms/<comm>/nodeid
30  * /config/dlm/<cluster>/comms/<comm>/local
31  * /config/dlm/<cluster>/comms/<comm>/addr      (write only)
32  * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
33  * The <cluster> level is useless, but I haven't figured out how to avoid it.
34  */
35 
36 static struct config_group *space_list;
37 static struct config_group *comm_list;
38 static struct dlm_comm *local_comm;
39 static uint32_t dlm_comm_count;
40 
41 struct dlm_clusters;
42 struct dlm_cluster;
43 struct dlm_spaces;
44 struct dlm_space;
45 struct dlm_comms;
46 struct dlm_comm;
47 struct dlm_nodes;
48 struct dlm_node;
49 
50 static struct config_group *make_cluster(struct config_group *, const char *);
51 static void drop_cluster(struct config_group *, struct config_item *);
52 static void release_cluster(struct config_item *);
53 static struct config_group *make_space(struct config_group *, const char *);
54 static void drop_space(struct config_group *, struct config_item *);
55 static void release_space(struct config_item *);
56 static struct config_item *make_comm(struct config_group *, const char *);
57 static void drop_comm(struct config_group *, struct config_item *);
58 static void release_comm(struct config_item *);
59 static struct config_item *make_node(struct config_group *, const char *);
60 static void drop_node(struct config_group *, struct config_item *);
61 static void release_node(struct config_item *);
62 
63 static struct configfs_attribute *comm_attrs[];
64 static struct configfs_attribute *node_attrs[];
65 
66 struct dlm_cluster {
67 	struct config_group group;
68 	unsigned int cl_tcp_port;
69 	unsigned int cl_buffer_size;
70 	unsigned int cl_rsbtbl_size;
71 	unsigned int cl_recover_timer;
72 	unsigned int cl_toss_secs;
73 	unsigned int cl_scan_secs;
74 	unsigned int cl_log_debug;
75 	unsigned int cl_log_info;
76 	unsigned int cl_protocol;
77 	unsigned int cl_mark;
78 #ifdef CONFIG_DLM_DEPRECATED_API
79 	unsigned int cl_timewarn_cs;
80 #endif
81 	unsigned int cl_new_rsb_count;
82 	unsigned int cl_recover_callbacks;
83 	char cl_cluster_name[DLM_LOCKSPACE_LEN];
84 
85 	struct dlm_spaces *sps;
86 	struct dlm_comms *cms;
87 };
88 
config_item_to_cluster(struct config_item * i)89 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
90 {
91 	return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
92 		   NULL;
93 }
94 
95 enum {
96 	CLUSTER_ATTR_TCP_PORT = 0,
97 	CLUSTER_ATTR_BUFFER_SIZE,
98 	CLUSTER_ATTR_RSBTBL_SIZE,
99 	CLUSTER_ATTR_RECOVER_TIMER,
100 	CLUSTER_ATTR_TOSS_SECS,
101 	CLUSTER_ATTR_SCAN_SECS,
102 	CLUSTER_ATTR_LOG_DEBUG,
103 	CLUSTER_ATTR_LOG_INFO,
104 	CLUSTER_ATTR_PROTOCOL,
105 	CLUSTER_ATTR_MARK,
106 #ifdef CONFIG_DLM_DEPRECATED_API
107 	CLUSTER_ATTR_TIMEWARN_CS,
108 #endif
109 	CLUSTER_ATTR_NEW_RSB_COUNT,
110 	CLUSTER_ATTR_RECOVER_CALLBACKS,
111 	CLUSTER_ATTR_CLUSTER_NAME,
112 };
113 
cluster_cluster_name_show(struct config_item * item,char * buf)114 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
115 {
116 	struct dlm_cluster *cl = config_item_to_cluster(item);
117 	return sprintf(buf, "%s\n", cl->cl_cluster_name);
118 }
119 
cluster_cluster_name_store(struct config_item * item,const char * buf,size_t len)120 static ssize_t cluster_cluster_name_store(struct config_item *item,
121 					  const char *buf, size_t len)
122 {
123 	struct dlm_cluster *cl = config_item_to_cluster(item);
124 
125 	strlcpy(dlm_config.ci_cluster_name, buf,
126 				sizeof(dlm_config.ci_cluster_name));
127 	strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
128 	return len;
129 }
130 
131 CONFIGFS_ATTR(cluster_, cluster_name);
132 
cluster_set(struct dlm_cluster * cl,unsigned int * cl_field,int * info_field,int (* check_cb)(unsigned int x),const char * buf,size_t len)133 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
134 			   int *info_field, int (*check_cb)(unsigned int x),
135 			   const char *buf, size_t len)
136 {
137 	unsigned int x;
138 	int rc;
139 
140 	if (!capable(CAP_SYS_ADMIN))
141 		return -EPERM;
142 	rc = kstrtouint(buf, 0, &x);
143 	if (rc)
144 		return rc;
145 
146 	if (check_cb) {
147 		rc = check_cb(x);
148 		if (rc)
149 			return rc;
150 	}
151 
152 	*cl_field = x;
153 	*info_field = x;
154 
155 	return len;
156 }
157 
158 #define CLUSTER_ATTR(name, check_cb)                                          \
159 static ssize_t cluster_##name##_store(struct config_item *item, \
160 		const char *buf, size_t len) \
161 {                                                                             \
162 	struct dlm_cluster *cl = config_item_to_cluster(item);		      \
163 	return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
164 			   check_cb, buf, len);                               \
165 }                                                                             \
166 static ssize_t cluster_##name##_show(struct config_item *item, char *buf)     \
167 {                                                                             \
168 	struct dlm_cluster *cl = config_item_to_cluster(item);		      \
169 	return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
170 }                                                                             \
171 CONFIGFS_ATTR(cluster_, name);
172 
dlm_check_protocol_and_dlm_running(unsigned int x)173 static int dlm_check_protocol_and_dlm_running(unsigned int x)
174 {
175 	switch (x) {
176 	case 0:
177 		/* TCP */
178 		break;
179 	case 1:
180 		/* SCTP */
181 		break;
182 	default:
183 		return -EINVAL;
184 	}
185 
186 	if (dlm_allow_conn)
187 		return -EBUSY;
188 
189 	return 0;
190 }
191 
dlm_check_zero_and_dlm_running(unsigned int x)192 static int dlm_check_zero_and_dlm_running(unsigned int x)
193 {
194 	if (!x)
195 		return -EINVAL;
196 
197 	if (dlm_allow_conn)
198 		return -EBUSY;
199 
200 	return 0;
201 }
202 
dlm_check_zero(unsigned int x)203 static int dlm_check_zero(unsigned int x)
204 {
205 	if (!x)
206 		return -EINVAL;
207 
208 	return 0;
209 }
210 
dlm_check_buffer_size(unsigned int x)211 static int dlm_check_buffer_size(unsigned int x)
212 {
213 	if (x < DLM_MAX_SOCKET_BUFSIZE)
214 		return -EINVAL;
215 
216 	return 0;
217 }
218 
219 CLUSTER_ATTR(tcp_port, dlm_check_zero_and_dlm_running);
220 CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
221 CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
222 CLUSTER_ATTR(recover_timer, dlm_check_zero);
223 CLUSTER_ATTR(toss_secs, dlm_check_zero);
224 CLUSTER_ATTR(scan_secs, dlm_check_zero);
225 CLUSTER_ATTR(log_debug, NULL);
226 CLUSTER_ATTR(log_info, NULL);
227 CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
228 CLUSTER_ATTR(mark, NULL);
229 #ifdef CONFIG_DLM_DEPRECATED_API
230 CLUSTER_ATTR(timewarn_cs, dlm_check_zero);
231 #endif
232 CLUSTER_ATTR(new_rsb_count, NULL);
233 CLUSTER_ATTR(recover_callbacks, NULL);
234 
235 static struct configfs_attribute *cluster_attrs[] = {
236 	[CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
237 	[CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
238 	[CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
239 	[CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
240 	[CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
241 	[CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
242 	[CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
243 	[CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
244 	[CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
245 	[CLUSTER_ATTR_MARK] = &cluster_attr_mark,
246 #ifdef CONFIG_DLM_DEPRECATED_API
247 	[CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
248 #endif
249 	[CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
250 	[CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
251 	[CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
252 	NULL,
253 };
254 
255 enum {
256 	COMM_ATTR_NODEID = 0,
257 	COMM_ATTR_LOCAL,
258 	COMM_ATTR_ADDR,
259 	COMM_ATTR_ADDR_LIST,
260 	COMM_ATTR_MARK,
261 };
262 
263 enum {
264 	NODE_ATTR_NODEID = 0,
265 	NODE_ATTR_WEIGHT,
266 };
267 
268 struct dlm_clusters {
269 	struct configfs_subsystem subsys;
270 };
271 
272 struct dlm_spaces {
273 	struct config_group ss_group;
274 };
275 
276 struct dlm_space {
277 	struct config_group group;
278 	struct list_head members;
279 	struct mutex members_lock;
280 	int members_count;
281 	struct dlm_nodes *nds;
282 };
283 
284 struct dlm_comms {
285 	struct config_group cs_group;
286 };
287 
288 struct dlm_comm {
289 	struct config_item item;
290 	int seq;
291 	int nodeid;
292 	int local;
293 	int addr_count;
294 	unsigned int mark;
295 	struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
296 };
297 
298 struct dlm_nodes {
299 	struct config_group ns_group;
300 };
301 
302 struct dlm_node {
303 	struct config_item item;
304 	struct list_head list; /* space->members */
305 	int nodeid;
306 	int weight;
307 	int new;
308 	int comm_seq; /* copy of cm->seq when nd->nodeid is set */
309 };
310 
311 static struct configfs_group_operations clusters_ops = {
312 	.make_group = make_cluster,
313 	.drop_item = drop_cluster,
314 };
315 
316 static struct configfs_item_operations cluster_ops = {
317 	.release = release_cluster,
318 };
319 
320 static struct configfs_group_operations spaces_ops = {
321 	.make_group = make_space,
322 	.drop_item = drop_space,
323 };
324 
325 static struct configfs_item_operations space_ops = {
326 	.release = release_space,
327 };
328 
329 static struct configfs_group_operations comms_ops = {
330 	.make_item = make_comm,
331 	.drop_item = drop_comm,
332 };
333 
334 static struct configfs_item_operations comm_ops = {
335 	.release = release_comm,
336 };
337 
338 static struct configfs_group_operations nodes_ops = {
339 	.make_item = make_node,
340 	.drop_item = drop_node,
341 };
342 
343 static struct configfs_item_operations node_ops = {
344 	.release = release_node,
345 };
346 
347 static const struct config_item_type clusters_type = {
348 	.ct_group_ops = &clusters_ops,
349 	.ct_owner = THIS_MODULE,
350 };
351 
352 static const struct config_item_type cluster_type = {
353 	.ct_item_ops = &cluster_ops,
354 	.ct_attrs = cluster_attrs,
355 	.ct_owner = THIS_MODULE,
356 };
357 
358 static const struct config_item_type spaces_type = {
359 	.ct_group_ops = &spaces_ops,
360 	.ct_owner = THIS_MODULE,
361 };
362 
363 static const struct config_item_type space_type = {
364 	.ct_item_ops = &space_ops,
365 	.ct_owner = THIS_MODULE,
366 };
367 
368 static const struct config_item_type comms_type = {
369 	.ct_group_ops = &comms_ops,
370 	.ct_owner = THIS_MODULE,
371 };
372 
373 static const struct config_item_type comm_type = {
374 	.ct_item_ops = &comm_ops,
375 	.ct_attrs = comm_attrs,
376 	.ct_owner = THIS_MODULE,
377 };
378 
379 static const struct config_item_type nodes_type = {
380 	.ct_group_ops = &nodes_ops,
381 	.ct_owner = THIS_MODULE,
382 };
383 
384 static const struct config_item_type node_type = {
385 	.ct_item_ops = &node_ops,
386 	.ct_attrs = node_attrs,
387 	.ct_owner = THIS_MODULE,
388 };
389 
config_item_to_space(struct config_item * i)390 static struct dlm_space *config_item_to_space(struct config_item *i)
391 {
392 	return i ? container_of(to_config_group(i), struct dlm_space, group) :
393 		   NULL;
394 }
395 
config_item_to_comm(struct config_item * i)396 static struct dlm_comm *config_item_to_comm(struct config_item *i)
397 {
398 	return i ? container_of(i, struct dlm_comm, item) : NULL;
399 }
400 
config_item_to_node(struct config_item * i)401 static struct dlm_node *config_item_to_node(struct config_item *i)
402 {
403 	return i ? container_of(i, struct dlm_node, item) : NULL;
404 }
405 
make_cluster(struct config_group * g,const char * name)406 static struct config_group *make_cluster(struct config_group *g,
407 					 const char *name)
408 {
409 	struct dlm_cluster *cl = NULL;
410 	struct dlm_spaces *sps = NULL;
411 	struct dlm_comms *cms = NULL;
412 
413 	cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
414 	sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
415 	cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
416 
417 	if (!cl || !sps || !cms)
418 		goto fail;
419 
420 	cl->sps = sps;
421 	cl->cms = cms;
422 
423 	config_group_init_type_name(&cl->group, name, &cluster_type);
424 	config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
425 	config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
426 
427 	configfs_add_default_group(&sps->ss_group, &cl->group);
428 	configfs_add_default_group(&cms->cs_group, &cl->group);
429 
430 	cl->cl_tcp_port = dlm_config.ci_tcp_port;
431 	cl->cl_buffer_size = dlm_config.ci_buffer_size;
432 	cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
433 	cl->cl_recover_timer = dlm_config.ci_recover_timer;
434 	cl->cl_toss_secs = dlm_config.ci_toss_secs;
435 	cl->cl_scan_secs = dlm_config.ci_scan_secs;
436 	cl->cl_log_debug = dlm_config.ci_log_debug;
437 	cl->cl_log_info = dlm_config.ci_log_info;
438 	cl->cl_protocol = dlm_config.ci_protocol;
439 #ifdef CONFIG_DLM_DEPRECATED_API
440 	cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
441 #endif
442 	cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
443 	cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
444 	memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
445 	       DLM_LOCKSPACE_LEN);
446 
447 	space_list = &sps->ss_group;
448 	comm_list = &cms->cs_group;
449 	return &cl->group;
450 
451  fail:
452 	kfree(cl);
453 	kfree(sps);
454 	kfree(cms);
455 	return ERR_PTR(-ENOMEM);
456 }
457 
drop_cluster(struct config_group * g,struct config_item * i)458 static void drop_cluster(struct config_group *g, struct config_item *i)
459 {
460 	struct dlm_cluster *cl = config_item_to_cluster(i);
461 
462 	configfs_remove_default_groups(&cl->group);
463 
464 	space_list = NULL;
465 	comm_list = NULL;
466 
467 	config_item_put(i);
468 }
469 
release_cluster(struct config_item * i)470 static void release_cluster(struct config_item *i)
471 {
472 	struct dlm_cluster *cl = config_item_to_cluster(i);
473 
474 	kfree(cl->sps);
475 	kfree(cl->cms);
476 	kfree(cl);
477 }
478 
make_space(struct config_group * g,const char * name)479 static struct config_group *make_space(struct config_group *g, const char *name)
480 {
481 	struct dlm_space *sp = NULL;
482 	struct dlm_nodes *nds = NULL;
483 
484 	sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
485 	nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
486 
487 	if (!sp || !nds)
488 		goto fail;
489 
490 	config_group_init_type_name(&sp->group, name, &space_type);
491 
492 	config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
493 	configfs_add_default_group(&nds->ns_group, &sp->group);
494 
495 	INIT_LIST_HEAD(&sp->members);
496 	mutex_init(&sp->members_lock);
497 	sp->members_count = 0;
498 	sp->nds = nds;
499 	return &sp->group;
500 
501  fail:
502 	kfree(sp);
503 	kfree(nds);
504 	return ERR_PTR(-ENOMEM);
505 }
506 
drop_space(struct config_group * g,struct config_item * i)507 static void drop_space(struct config_group *g, struct config_item *i)
508 {
509 	struct dlm_space *sp = config_item_to_space(i);
510 
511 	/* assert list_empty(&sp->members) */
512 
513 	configfs_remove_default_groups(&sp->group);
514 	config_item_put(i);
515 }
516 
release_space(struct config_item * i)517 static void release_space(struct config_item *i)
518 {
519 	struct dlm_space *sp = config_item_to_space(i);
520 	kfree(sp->nds);
521 	kfree(sp);
522 }
523 
make_comm(struct config_group * g,const char * name)524 static struct config_item *make_comm(struct config_group *g, const char *name)
525 {
526 	struct dlm_comm *cm;
527 
528 	cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
529 	if (!cm)
530 		return ERR_PTR(-ENOMEM);
531 
532 	config_item_init_type_name(&cm->item, name, &comm_type);
533 
534 	cm->seq = dlm_comm_count++;
535 	if (!cm->seq)
536 		cm->seq = dlm_comm_count++;
537 
538 	cm->nodeid = -1;
539 	cm->local = 0;
540 	cm->addr_count = 0;
541 	cm->mark = 0;
542 	return &cm->item;
543 }
544 
drop_comm(struct config_group * g,struct config_item * i)545 static void drop_comm(struct config_group *g, struct config_item *i)
546 {
547 	struct dlm_comm *cm = config_item_to_comm(i);
548 	if (local_comm == cm)
549 		local_comm = NULL;
550 	dlm_midcomms_close(cm->nodeid);
551 	while (cm->addr_count--)
552 		kfree(cm->addr[cm->addr_count]);
553 	config_item_put(i);
554 }
555 
release_comm(struct config_item * i)556 static void release_comm(struct config_item *i)
557 {
558 	struct dlm_comm *cm = config_item_to_comm(i);
559 	kfree(cm);
560 }
561 
make_node(struct config_group * g,const char * name)562 static struct config_item *make_node(struct config_group *g, const char *name)
563 {
564 	struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
565 	struct dlm_node *nd;
566 
567 	nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
568 	if (!nd)
569 		return ERR_PTR(-ENOMEM);
570 
571 	config_item_init_type_name(&nd->item, name, &node_type);
572 	nd->nodeid = -1;
573 	nd->weight = 1;  /* default weight of 1 if none is set */
574 	nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
575 
576 	mutex_lock(&sp->members_lock);
577 	list_add(&nd->list, &sp->members);
578 	sp->members_count++;
579 	mutex_unlock(&sp->members_lock);
580 
581 	return &nd->item;
582 }
583 
drop_node(struct config_group * g,struct config_item * i)584 static void drop_node(struct config_group *g, struct config_item *i)
585 {
586 	struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
587 	struct dlm_node *nd = config_item_to_node(i);
588 
589 	mutex_lock(&sp->members_lock);
590 	list_del(&nd->list);
591 	sp->members_count--;
592 	mutex_unlock(&sp->members_lock);
593 
594 	config_item_put(i);
595 }
596 
release_node(struct config_item * i)597 static void release_node(struct config_item *i)
598 {
599 	struct dlm_node *nd = config_item_to_node(i);
600 	kfree(nd);
601 }
602 
603 static struct dlm_clusters clusters_root = {
604 	.subsys = {
605 		.su_group = {
606 			.cg_item = {
607 				.ci_namebuf = "dlm",
608 				.ci_type = &clusters_type,
609 			},
610 		},
611 	},
612 };
613 
dlm_config_init(void)614 int __init dlm_config_init(void)
615 {
616 	config_group_init(&clusters_root.subsys.su_group);
617 	mutex_init(&clusters_root.subsys.su_mutex);
618 	return configfs_register_subsystem(&clusters_root.subsys);
619 }
620 
dlm_config_exit(void)621 void dlm_config_exit(void)
622 {
623 	configfs_unregister_subsystem(&clusters_root.subsys);
624 }
625 
626 /*
627  * Functions for user space to read/write attributes
628  */
629 
comm_nodeid_show(struct config_item * item,char * buf)630 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
631 {
632 	return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
633 }
634 
comm_nodeid_store(struct config_item * item,const char * buf,size_t len)635 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
636 				 size_t len)
637 {
638 	int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
639 
640 	if (rc)
641 		return rc;
642 	return len;
643 }
644 
comm_local_show(struct config_item * item,char * buf)645 static ssize_t comm_local_show(struct config_item *item, char *buf)
646 {
647 	return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
648 }
649 
comm_local_store(struct config_item * item,const char * buf,size_t len)650 static ssize_t comm_local_store(struct config_item *item, const char *buf,
651 				size_t len)
652 {
653 	struct dlm_comm *cm = config_item_to_comm(item);
654 	int rc = kstrtoint(buf, 0, &cm->local);
655 
656 	if (rc)
657 		return rc;
658 	if (cm->local && !local_comm)
659 		local_comm = cm;
660 	return len;
661 }
662 
comm_addr_store(struct config_item * item,const char * buf,size_t len)663 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
664 		size_t len)
665 {
666 	struct dlm_comm *cm = config_item_to_comm(item);
667 	struct sockaddr_storage *addr;
668 	int rv;
669 
670 	if (len != sizeof(struct sockaddr_storage))
671 		return -EINVAL;
672 
673 	if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
674 		return -ENOSPC;
675 
676 	addr = kzalloc(sizeof(*addr), GFP_NOFS);
677 	if (!addr)
678 		return -ENOMEM;
679 
680 	memcpy(addr, buf, len);
681 
682 	rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
683 	if (rv) {
684 		kfree(addr);
685 		return rv;
686 	}
687 
688 	cm->addr[cm->addr_count++] = addr;
689 	return len;
690 }
691 
comm_addr_list_show(struct config_item * item,char * buf)692 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
693 {
694 	struct dlm_comm *cm = config_item_to_comm(item);
695 	ssize_t s;
696 	ssize_t allowance;
697 	int i;
698 	struct sockaddr_storage *addr;
699 	struct sockaddr_in *addr_in;
700 	struct sockaddr_in6 *addr_in6;
701 
702 	/* Taken from ip6_addr_string() defined in lib/vsprintf.c */
703 	char buf0[sizeof("AF_INET6	xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
704 
705 
706 	/* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
707 	allowance = 4096;
708 	buf[0] = '\0';
709 
710 	for (i = 0; i < cm->addr_count; i++) {
711 		addr = cm->addr[i];
712 
713 		switch(addr->ss_family) {
714 		case AF_INET:
715 			addr_in = (struct sockaddr_in *)addr;
716 			s = sprintf(buf0, "AF_INET	%pI4\n", &addr_in->sin_addr.s_addr);
717 			break;
718 		case AF_INET6:
719 			addr_in6 = (struct sockaddr_in6 *)addr;
720 			s = sprintf(buf0, "AF_INET6	%pI6\n", &addr_in6->sin6_addr);
721 			break;
722 		default:
723 			s = sprintf(buf0, "%s\n", "<UNKNOWN>");
724 			break;
725 		}
726 		allowance -= s;
727 		if (allowance >= 0)
728 			strcat(buf, buf0);
729 		else {
730 			allowance += s;
731 			break;
732 		}
733 	}
734 	return 4096 - allowance;
735 }
736 
comm_mark_show(struct config_item * item,char * buf)737 static ssize_t comm_mark_show(struct config_item *item, char *buf)
738 {
739 	return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
740 }
741 
comm_mark_store(struct config_item * item,const char * buf,size_t len)742 static ssize_t comm_mark_store(struct config_item *item, const char *buf,
743 			       size_t len)
744 {
745 	struct dlm_comm *comm;
746 	unsigned int mark;
747 	int rc;
748 
749 	rc = kstrtouint(buf, 0, &mark);
750 	if (rc)
751 		return rc;
752 
753 	if (mark == 0)
754 		mark = dlm_config.ci_mark;
755 
756 	comm = config_item_to_comm(item);
757 	rc = dlm_lowcomms_nodes_set_mark(comm->nodeid, mark);
758 	if (rc)
759 		return rc;
760 
761 	comm->mark = mark;
762 	return len;
763 }
764 
765 CONFIGFS_ATTR(comm_, nodeid);
766 CONFIGFS_ATTR(comm_, local);
767 CONFIGFS_ATTR(comm_, mark);
768 CONFIGFS_ATTR_WO(comm_, addr);
769 CONFIGFS_ATTR_RO(comm_, addr_list);
770 
771 static struct configfs_attribute *comm_attrs[] = {
772 	[COMM_ATTR_NODEID] = &comm_attr_nodeid,
773 	[COMM_ATTR_LOCAL] = &comm_attr_local,
774 	[COMM_ATTR_ADDR] = &comm_attr_addr,
775 	[COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
776 	[COMM_ATTR_MARK] = &comm_attr_mark,
777 	NULL,
778 };
779 
node_nodeid_show(struct config_item * item,char * buf)780 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
781 {
782 	return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
783 }
784 
node_nodeid_store(struct config_item * item,const char * buf,size_t len)785 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
786 				 size_t len)
787 {
788 	struct dlm_node *nd = config_item_to_node(item);
789 	uint32_t seq = 0;
790 	int rc = kstrtoint(buf, 0, &nd->nodeid);
791 
792 	if (rc)
793 		return rc;
794 	dlm_comm_seq(nd->nodeid, &seq);
795 	nd->comm_seq = seq;
796 	return len;
797 }
798 
node_weight_show(struct config_item * item,char * buf)799 static ssize_t node_weight_show(struct config_item *item, char *buf)
800 {
801 	return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
802 }
803 
node_weight_store(struct config_item * item,const char * buf,size_t len)804 static ssize_t node_weight_store(struct config_item *item, const char *buf,
805 				 size_t len)
806 {
807 	int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
808 
809 	if (rc)
810 		return rc;
811 	return len;
812 }
813 
814 CONFIGFS_ATTR(node_, nodeid);
815 CONFIGFS_ATTR(node_, weight);
816 
817 static struct configfs_attribute *node_attrs[] = {
818 	[NODE_ATTR_NODEID] = &node_attr_nodeid,
819 	[NODE_ATTR_WEIGHT] = &node_attr_weight,
820 	NULL,
821 };
822 
823 /*
824  * Functions for the dlm to get the info that's been configured
825  */
826 
get_space(char * name)827 static struct dlm_space *get_space(char *name)
828 {
829 	struct config_item *i;
830 
831 	if (!space_list)
832 		return NULL;
833 
834 	mutex_lock(&space_list->cg_subsys->su_mutex);
835 	i = config_group_find_item(space_list, name);
836 	mutex_unlock(&space_list->cg_subsys->su_mutex);
837 
838 	return config_item_to_space(i);
839 }
840 
put_space(struct dlm_space * sp)841 static void put_space(struct dlm_space *sp)
842 {
843 	config_item_put(&sp->group.cg_item);
844 }
845 
get_comm(int nodeid)846 static struct dlm_comm *get_comm(int nodeid)
847 {
848 	struct config_item *i;
849 	struct dlm_comm *cm = NULL;
850 	int found = 0;
851 
852 	if (!comm_list)
853 		return NULL;
854 
855 	mutex_lock(&clusters_root.subsys.su_mutex);
856 
857 	list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
858 		cm = config_item_to_comm(i);
859 
860 		if (cm->nodeid != nodeid)
861 			continue;
862 		found = 1;
863 		config_item_get(i);
864 		break;
865 	}
866 	mutex_unlock(&clusters_root.subsys.su_mutex);
867 
868 	if (!found)
869 		cm = NULL;
870 	return cm;
871 }
872 
put_comm(struct dlm_comm * cm)873 static void put_comm(struct dlm_comm *cm)
874 {
875 	config_item_put(&cm->item);
876 }
877 
878 /* caller must free mem */
dlm_config_nodes(char * lsname,struct dlm_config_node ** nodes_out,int * count_out)879 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
880 		     int *count_out)
881 {
882 	struct dlm_space *sp;
883 	struct dlm_node *nd;
884 	struct dlm_config_node *nodes, *node;
885 	int rv, count;
886 
887 	sp = get_space(lsname);
888 	if (!sp)
889 		return -EEXIST;
890 
891 	mutex_lock(&sp->members_lock);
892 	if (!sp->members_count) {
893 		rv = -EINVAL;
894 		printk(KERN_ERR "dlm: zero members_count\n");
895 		goto out;
896 	}
897 
898 	count = sp->members_count;
899 
900 	nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
901 	if (!nodes) {
902 		rv = -ENOMEM;
903 		goto out;
904 	}
905 
906 	node = nodes;
907 	list_for_each_entry(nd, &sp->members, list) {
908 		node->nodeid = nd->nodeid;
909 		node->weight = nd->weight;
910 		node->new = nd->new;
911 		node->comm_seq = nd->comm_seq;
912 		node++;
913 
914 		nd->new = 0;
915 	}
916 
917 	*count_out = count;
918 	*nodes_out = nodes;
919 	rv = 0;
920  out:
921 	mutex_unlock(&sp->members_lock);
922 	put_space(sp);
923 	return rv;
924 }
925 
dlm_comm_seq(int nodeid,uint32_t * seq)926 int dlm_comm_seq(int nodeid, uint32_t *seq)
927 {
928 	struct dlm_comm *cm = get_comm(nodeid);
929 	if (!cm)
930 		return -EEXIST;
931 	*seq = cm->seq;
932 	put_comm(cm);
933 	return 0;
934 }
935 
dlm_our_nodeid(void)936 int dlm_our_nodeid(void)
937 {
938 	return local_comm ? local_comm->nodeid : 0;
939 }
940 
941 /* num 0 is first addr, num 1 is second addr */
dlm_our_addr(struct sockaddr_storage * addr,int num)942 int dlm_our_addr(struct sockaddr_storage *addr, int num)
943 {
944 	if (!local_comm)
945 		return -1;
946 	if (num + 1 > local_comm->addr_count)
947 		return -1;
948 	memcpy(addr, local_comm->addr[num], sizeof(*addr));
949 	return 0;
950 }
951 
952 /* Config file defaults */
953 #define DEFAULT_TCP_PORT       21064
954 #define DEFAULT_RSBTBL_SIZE     1024
955 #define DEFAULT_RECOVER_TIMER      5
956 #define DEFAULT_TOSS_SECS         10
957 #define DEFAULT_SCAN_SECS          5
958 #define DEFAULT_LOG_DEBUG          0
959 #define DEFAULT_LOG_INFO           1
960 #define DEFAULT_PROTOCOL           DLM_PROTO_TCP
961 #define DEFAULT_MARK               0
962 #ifdef CONFIG_DLM_DEPRECATED_API
963 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
964 #endif
965 #define DEFAULT_NEW_RSB_COUNT    128
966 #define DEFAULT_RECOVER_CALLBACKS  0
967 #define DEFAULT_CLUSTER_NAME      ""
968 
969 struct dlm_config_info dlm_config = {
970 	.ci_tcp_port = DEFAULT_TCP_PORT,
971 	.ci_buffer_size = DLM_MAX_SOCKET_BUFSIZE,
972 	.ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
973 	.ci_recover_timer = DEFAULT_RECOVER_TIMER,
974 	.ci_toss_secs = DEFAULT_TOSS_SECS,
975 	.ci_scan_secs = DEFAULT_SCAN_SECS,
976 	.ci_log_debug = DEFAULT_LOG_DEBUG,
977 	.ci_log_info = DEFAULT_LOG_INFO,
978 	.ci_protocol = DEFAULT_PROTOCOL,
979 	.ci_mark = DEFAULT_MARK,
980 #ifdef CONFIG_DLM_DEPRECATED_API
981 	.ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
982 #endif
983 	.ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
984 	.ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
985 	.ci_cluster_name = DEFAULT_CLUSTER_NAME
986 };
987 
988