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 (refers to <node>)
28 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
29 * /config/dlm/<cluster>/comms/<comm>/nodeid (refers to <comm>)
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 const struct rhashtable_params dlm_rhash_rsb_params = {
67 .nelem_hint = 3, /* start small */
68 .key_len = DLM_RESNAME_MAXLEN,
69 .key_offset = offsetof(struct dlm_rsb, res_name),
70 .head_offset = offsetof(struct dlm_rsb, res_node),
71 .automatic_shrinking = true,
72 };
73
74 struct dlm_cluster {
75 struct config_group group;
76 struct dlm_spaces *sps;
77 struct dlm_comms *cms;
78 };
79
config_item_to_cluster(struct config_item * i)80 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
81 {
82 return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
83 NULL;
84 }
85
86 enum {
87 CLUSTER_ATTR_TCP_PORT = 0,
88 CLUSTER_ATTR_BUFFER_SIZE,
89 CLUSTER_ATTR_RSBTBL_SIZE,
90 CLUSTER_ATTR_RECOVER_TIMER,
91 CLUSTER_ATTR_TOSS_SECS,
92 CLUSTER_ATTR_SCAN_SECS,
93 CLUSTER_ATTR_LOG_DEBUG,
94 CLUSTER_ATTR_LOG_INFO,
95 CLUSTER_ATTR_PROTOCOL,
96 CLUSTER_ATTR_MARK,
97 CLUSTER_ATTR_NEW_RSB_COUNT,
98 CLUSTER_ATTR_RECOVER_CALLBACKS,
99 CLUSTER_ATTR_CLUSTER_NAME,
100 };
101
cluster_cluster_name_show(struct config_item * item,char * buf)102 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
103 {
104 return sprintf(buf, "%s\n", dlm_config.ci_cluster_name);
105 }
106
cluster_cluster_name_store(struct config_item * item,const char * buf,size_t len)107 static ssize_t cluster_cluster_name_store(struct config_item *item,
108 const char *buf, size_t len)
109 {
110 strscpy(dlm_config.ci_cluster_name, buf,
111 sizeof(dlm_config.ci_cluster_name));
112 return len;
113 }
114
115 CONFIGFS_ATTR(cluster_, cluster_name);
116
cluster_tcp_port_show(struct config_item * item,char * buf)117 static ssize_t cluster_tcp_port_show(struct config_item *item, char *buf)
118 {
119 return sprintf(buf, "%u\n", be16_to_cpu(dlm_config.ci_tcp_port));
120 }
121
dlm_check_zero_and_dlm_running(unsigned int x)122 static int dlm_check_zero_and_dlm_running(unsigned int x)
123 {
124 if (!x)
125 return -EINVAL;
126
127 if (dlm_lowcomms_is_running())
128 return -EBUSY;
129
130 return 0;
131 }
132
cluster_tcp_port_store(struct config_item * item,const char * buf,size_t len)133 static ssize_t cluster_tcp_port_store(struct config_item *item,
134 const char *buf, size_t len)
135 {
136 int rc;
137 u16 x;
138
139 if (!capable(CAP_SYS_ADMIN))
140 return -EPERM;
141
142 rc = kstrtou16(buf, 0, &x);
143 if (rc)
144 return rc;
145
146 rc = dlm_check_zero_and_dlm_running(x);
147 if (rc)
148 return rc;
149
150 dlm_config.ci_tcp_port = cpu_to_be16(x);
151 return len;
152 }
153
154 CONFIGFS_ATTR(cluster_, tcp_port);
155
cluster_set(unsigned int * info_field,int (* check_cb)(unsigned int x),const char * buf,size_t len)156 static ssize_t cluster_set(unsigned int *info_field,
157 int (*check_cb)(unsigned int x),
158 const char *buf, size_t len)
159 {
160 unsigned int x;
161 int rc;
162
163 if (!capable(CAP_SYS_ADMIN))
164 return -EPERM;
165 rc = kstrtouint(buf, 0, &x);
166 if (rc)
167 return rc;
168
169 if (check_cb) {
170 rc = check_cb(x);
171 if (rc)
172 return rc;
173 }
174
175 *info_field = x;
176
177 return len;
178 }
179
180 #define CLUSTER_ATTR(name, check_cb) \
181 static ssize_t cluster_##name##_store(struct config_item *item, \
182 const char *buf, size_t len) \
183 { \
184 return cluster_set(&dlm_config.ci_##name, check_cb, buf, len); \
185 } \
186 static ssize_t cluster_##name##_show(struct config_item *item, char *buf) \
187 { \
188 return snprintf(buf, PAGE_SIZE, "%u\n", dlm_config.ci_##name); \
189 } \
190 CONFIGFS_ATTR(cluster_, name);
191
dlm_check_protocol_and_dlm_running(unsigned int x)192 static int dlm_check_protocol_and_dlm_running(unsigned int x)
193 {
194 switch (x) {
195 case 0:
196 /* TCP */
197 break;
198 case 1:
199 /* SCTP */
200 break;
201 default:
202 return -EINVAL;
203 }
204
205 if (dlm_lowcomms_is_running())
206 return -EBUSY;
207
208 return 0;
209 }
210
dlm_check_zero(unsigned int x)211 static int dlm_check_zero(unsigned int x)
212 {
213 if (!x)
214 return -EINVAL;
215
216 return 0;
217 }
218
dlm_check_buffer_size(unsigned int x)219 static int dlm_check_buffer_size(unsigned int x)
220 {
221 if (x < DLM_MAX_SOCKET_BUFSIZE)
222 return -EINVAL;
223
224 return 0;
225 }
226
227 CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
228 CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
229 CLUSTER_ATTR(recover_timer, dlm_check_zero);
230 CLUSTER_ATTR(toss_secs, dlm_check_zero);
231 CLUSTER_ATTR(scan_secs, dlm_check_zero);
232 CLUSTER_ATTR(log_debug, NULL);
233 CLUSTER_ATTR(log_info, NULL);
234 CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
235 CLUSTER_ATTR(mark, NULL);
236 CLUSTER_ATTR(new_rsb_count, NULL);
237 CLUSTER_ATTR(recover_callbacks, NULL);
238
239 static struct configfs_attribute *cluster_attrs[] = {
240 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
241 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
242 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
243 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
244 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
245 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
246 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
247 [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
248 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
249 [CLUSTER_ATTR_MARK] = &cluster_attr_mark,
250 [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
251 [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
252 [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
253 NULL,
254 };
255
256 enum {
257 COMM_ATTR_NODEID = 0,
258 COMM_ATTR_LOCAL,
259 COMM_ATTR_ADDR,
260 COMM_ATTR_ADDR_LIST,
261 COMM_ATTR_MARK,
262 };
263
264 enum {
265 NODE_ATTR_NODEID = 0,
266 NODE_ATTR_WEIGHT,
267 };
268
269 struct dlm_clusters {
270 struct configfs_subsystem subsys;
271 };
272
273 struct dlm_spaces {
274 struct config_group ss_group;
275 };
276
277 struct dlm_space {
278 struct config_group group;
279 struct list_head members;
280 struct mutex members_lock;
281 int members_count;
282 struct dlm_nodes *nds;
283 };
284
285 struct dlm_comms {
286 struct config_group cs_group;
287 };
288
289 struct dlm_comm {
290 struct config_item item;
291 int seq;
292 int nodeid;
293 int local;
294 int addr_count;
295 unsigned int mark;
296 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
297 };
298
299 struct dlm_nodes {
300 struct config_group ns_group;
301 };
302
303 struct dlm_node {
304 struct config_item item;
305 struct list_head list; /* space->members */
306 int nodeid;
307 int weight;
308 int new;
309 int comm_seq; /* copy of cm->seq when nd->nodeid is set */
310 };
311
312 static struct configfs_group_operations clusters_ops = {
313 .make_group = make_cluster,
314 .drop_item = drop_cluster,
315 };
316
317 static struct configfs_item_operations cluster_ops = {
318 .release = release_cluster,
319 };
320
321 static struct configfs_group_operations spaces_ops = {
322 .make_group = make_space,
323 .drop_item = drop_space,
324 };
325
326 static struct configfs_item_operations space_ops = {
327 .release = release_space,
328 };
329
330 static struct configfs_group_operations comms_ops = {
331 .make_item = make_comm,
332 .drop_item = drop_comm,
333 };
334
335 static struct configfs_item_operations comm_ops = {
336 .release = release_comm,
337 };
338
339 static struct configfs_group_operations nodes_ops = {
340 .make_item = make_node,
341 .drop_item = drop_node,
342 };
343
344 static struct configfs_item_operations node_ops = {
345 .release = release_node,
346 };
347
348 static const struct config_item_type clusters_type = {
349 .ct_group_ops = &clusters_ops,
350 .ct_owner = THIS_MODULE,
351 };
352
353 static const struct config_item_type cluster_type = {
354 .ct_item_ops = &cluster_ops,
355 .ct_attrs = cluster_attrs,
356 .ct_owner = THIS_MODULE,
357 };
358
359 static const struct config_item_type spaces_type = {
360 .ct_group_ops = &spaces_ops,
361 .ct_owner = THIS_MODULE,
362 };
363
364 static const struct config_item_type space_type = {
365 .ct_item_ops = &space_ops,
366 .ct_owner = THIS_MODULE,
367 };
368
369 static const struct config_item_type comms_type = {
370 .ct_group_ops = &comms_ops,
371 .ct_owner = THIS_MODULE,
372 };
373
374 static const struct config_item_type comm_type = {
375 .ct_item_ops = &comm_ops,
376 .ct_attrs = comm_attrs,
377 .ct_owner = THIS_MODULE,
378 };
379
380 static const struct config_item_type nodes_type = {
381 .ct_group_ops = &nodes_ops,
382 .ct_owner = THIS_MODULE,
383 };
384
385 static const struct config_item_type node_type = {
386 .ct_item_ops = &node_ops,
387 .ct_attrs = node_attrs,
388 .ct_owner = THIS_MODULE,
389 };
390
config_item_to_space(struct config_item * i)391 static struct dlm_space *config_item_to_space(struct config_item *i)
392 {
393 return i ? container_of(to_config_group(i), struct dlm_space, group) :
394 NULL;
395 }
396
config_item_to_comm(struct config_item * i)397 static struct dlm_comm *config_item_to_comm(struct config_item *i)
398 {
399 return i ? container_of(i, struct dlm_comm, item) : NULL;
400 }
401
config_item_to_node(struct config_item * i)402 static struct dlm_node *config_item_to_node(struct config_item *i)
403 {
404 return i ? container_of(i, struct dlm_node, item) : NULL;
405 }
406
make_cluster(struct config_group * g,const char * name)407 static struct config_group *make_cluster(struct config_group *g,
408 const char *name)
409 {
410 struct dlm_cluster *cl = NULL;
411 struct dlm_spaces *sps = NULL;
412 struct dlm_comms *cms = NULL;
413
414 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
415 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
416 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
417
418 if (!cl || !sps || !cms)
419 goto fail;
420
421 cl->sps = sps;
422 cl->cms = cms;
423
424 config_group_init_type_name(&cl->group, name, &cluster_type);
425 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
426 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
427
428 configfs_add_default_group(&sps->ss_group, &cl->group);
429 configfs_add_default_group(&cms->cs_group, &cl->group);
430
431 space_list = &sps->ss_group;
432 comm_list = &cms->cs_group;
433 return &cl->group;
434
435 fail:
436 kfree(cl);
437 kfree(sps);
438 kfree(cms);
439 return ERR_PTR(-ENOMEM);
440 }
441
drop_cluster(struct config_group * g,struct config_item * i)442 static void drop_cluster(struct config_group *g, struct config_item *i)
443 {
444 struct dlm_cluster *cl = config_item_to_cluster(i);
445
446 configfs_remove_default_groups(&cl->group);
447
448 space_list = NULL;
449 comm_list = NULL;
450
451 config_item_put(i);
452 }
453
release_cluster(struct config_item * i)454 static void release_cluster(struct config_item *i)
455 {
456 struct dlm_cluster *cl = config_item_to_cluster(i);
457
458 kfree(cl->sps);
459 kfree(cl->cms);
460 kfree(cl);
461 }
462
make_space(struct config_group * g,const char * name)463 static struct config_group *make_space(struct config_group *g, const char *name)
464 {
465 struct dlm_space *sp = NULL;
466 struct dlm_nodes *nds = NULL;
467
468 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
469 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
470
471 if (!sp || !nds)
472 goto fail;
473
474 config_group_init_type_name(&sp->group, name, &space_type);
475
476 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
477 configfs_add_default_group(&nds->ns_group, &sp->group);
478
479 INIT_LIST_HEAD(&sp->members);
480 mutex_init(&sp->members_lock);
481 sp->members_count = 0;
482 sp->nds = nds;
483 return &sp->group;
484
485 fail:
486 kfree(sp);
487 kfree(nds);
488 return ERR_PTR(-ENOMEM);
489 }
490
drop_space(struct config_group * g,struct config_item * i)491 static void drop_space(struct config_group *g, struct config_item *i)
492 {
493 struct dlm_space *sp = config_item_to_space(i);
494
495 /* assert list_empty(&sp->members) */
496
497 configfs_remove_default_groups(&sp->group);
498 config_item_put(i);
499 }
500
release_space(struct config_item * i)501 static void release_space(struct config_item *i)
502 {
503 struct dlm_space *sp = config_item_to_space(i);
504 kfree(sp->nds);
505 kfree(sp);
506 }
507
make_comm(struct config_group * g,const char * name)508 static struct config_item *make_comm(struct config_group *g, const char *name)
509 {
510 struct dlm_comm *cm;
511 unsigned int nodeid;
512 int rv;
513
514 rv = kstrtouint(name, 0, &nodeid);
515 if (rv)
516 return ERR_PTR(rv);
517
518 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
519 if (!cm)
520 return ERR_PTR(-ENOMEM);
521
522 config_item_init_type_name(&cm->item, name, &comm_type);
523
524 cm->seq = dlm_comm_count++;
525 if (!cm->seq)
526 cm->seq = dlm_comm_count++;
527
528 cm->nodeid = nodeid;
529 cm->local = 0;
530 cm->addr_count = 0;
531 cm->mark = 0;
532 return &cm->item;
533 }
534
drop_comm(struct config_group * g,struct config_item * i)535 static void drop_comm(struct config_group *g, struct config_item *i)
536 {
537 struct dlm_comm *cm = config_item_to_comm(i);
538 if (local_comm == cm)
539 local_comm = NULL;
540 dlm_midcomms_close(cm->nodeid);
541 while (cm->addr_count--)
542 kfree(cm->addr[cm->addr_count]);
543 config_item_put(i);
544 }
545
release_comm(struct config_item * i)546 static void release_comm(struct config_item *i)
547 {
548 struct dlm_comm *cm = config_item_to_comm(i);
549 kfree(cm);
550 }
551
make_node(struct config_group * g,const char * name)552 static struct config_item *make_node(struct config_group *g, const char *name)
553 {
554 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
555 unsigned int nodeid;
556 struct dlm_node *nd;
557 uint32_t seq = 0;
558 int rv;
559
560 rv = kstrtouint(name, 0, &nodeid);
561 if (rv)
562 return ERR_PTR(rv);
563
564 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
565 if (!nd)
566 return ERR_PTR(-ENOMEM);
567
568 config_item_init_type_name(&nd->item, name, &node_type);
569 nd->nodeid = nodeid;
570 nd->weight = 1; /* default weight of 1 if none is set */
571 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
572 dlm_comm_seq(nodeid, &seq, true);
573 nd->comm_seq = seq;
574
575 mutex_lock(&sp->members_lock);
576 list_add(&nd->list, &sp->members);
577 sp->members_count++;
578 mutex_unlock(&sp->members_lock);
579
580 return &nd->item;
581 }
582
drop_node(struct config_group * g,struct config_item * i)583 static void drop_node(struct config_group *g, struct config_item *i)
584 {
585 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
586 struct dlm_node *nd = config_item_to_node(i);
587
588 mutex_lock(&sp->members_lock);
589 list_del(&nd->list);
590 sp->members_count--;
591 mutex_unlock(&sp->members_lock);
592
593 config_item_put(i);
594 }
595
release_node(struct config_item * i)596 static void release_node(struct config_item *i)
597 {
598 struct dlm_node *nd = config_item_to_node(i);
599 kfree(nd);
600 }
601
602 static struct dlm_clusters clusters_root = {
603 .subsys = {
604 .su_group = {
605 .cg_item = {
606 .ci_namebuf = "dlm",
607 .ci_type = &clusters_type,
608 },
609 },
610 },
611 };
612
dlm_config_init(void)613 int __init dlm_config_init(void)
614 {
615 config_group_init(&clusters_root.subsys.su_group);
616 mutex_init(&clusters_root.subsys.su_mutex);
617 return configfs_register_subsystem(&clusters_root.subsys);
618 }
619
dlm_config_exit(void)620 void dlm_config_exit(void)
621 {
622 configfs_unregister_subsystem(&clusters_root.subsys);
623 }
624
625 /*
626 * Functions for user space to read/write attributes
627 */
628
comm_nodeid_show(struct config_item * item,char * buf)629 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
630 {
631 unsigned int nodeid;
632 int rv;
633
634 rv = kstrtouint(config_item_name(item), 0, &nodeid);
635 if (WARN_ON(rv))
636 return rv;
637
638 return sprintf(buf, "%u\n", nodeid);
639 }
640
comm_nodeid_store(struct config_item * item,const char * buf,size_t len)641 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
642 size_t len)
643 {
644 return len;
645 }
646
comm_local_show(struct config_item * item,char * buf)647 static ssize_t comm_local_show(struct config_item *item, char *buf)
648 {
649 return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
650 }
651
comm_local_store(struct config_item * item,const char * buf,size_t len)652 static ssize_t comm_local_store(struct config_item *item, const char *buf,
653 size_t len)
654 {
655 struct dlm_comm *cm = config_item_to_comm(item);
656 int rc = kstrtoint(buf, 0, &cm->local);
657
658 if (rc)
659 return rc;
660 if (cm->local && !local_comm)
661 local_comm = cm;
662 return len;
663 }
664
comm_addr_store(struct config_item * item,const char * buf,size_t len)665 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
666 size_t len)
667 {
668 struct dlm_comm *cm = config_item_to_comm(item);
669 struct sockaddr_storage *addr;
670 int rv;
671
672 if (len != sizeof(struct sockaddr_storage))
673 return -EINVAL;
674
675 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
676 return -ENOSPC;
677
678 addr = kzalloc(sizeof(*addr), GFP_NOFS);
679 if (!addr)
680 return -ENOMEM;
681
682 memcpy(addr, buf, len);
683
684 rv = dlm_midcomms_addr(cm->nodeid, addr);
685 if (rv) {
686 kfree(addr);
687 return rv;
688 }
689
690 cm->addr[cm->addr_count++] = addr;
691 return len;
692 }
693
comm_addr_list_show(struct config_item * item,char * buf)694 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
695 {
696 struct dlm_comm *cm = config_item_to_comm(item);
697 ssize_t s;
698 ssize_t allowance;
699 int i;
700 struct sockaddr_storage *addr;
701 struct sockaddr_in *addr_in;
702 struct sockaddr_in6 *addr_in6;
703
704 /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
705 char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
706
707
708 /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
709 allowance = 4096;
710 buf[0] = '\0';
711
712 for (i = 0; i < cm->addr_count; i++) {
713 addr = cm->addr[i];
714
715 switch(addr->ss_family) {
716 case AF_INET:
717 addr_in = (struct sockaddr_in *)addr;
718 s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr);
719 break;
720 case AF_INET6:
721 addr_in6 = (struct sockaddr_in6 *)addr;
722 s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr);
723 break;
724 default:
725 s = sprintf(buf0, "%s\n", "<UNKNOWN>");
726 break;
727 }
728 allowance -= s;
729 if (allowance >= 0)
730 strcat(buf, buf0);
731 else {
732 allowance += s;
733 break;
734 }
735 }
736 return 4096 - allowance;
737 }
738
comm_mark_show(struct config_item * item,char * buf)739 static ssize_t comm_mark_show(struct config_item *item, char *buf)
740 {
741 return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
742 }
743
comm_mark_store(struct config_item * item,const char * buf,size_t len)744 static ssize_t comm_mark_store(struct config_item *item, const char *buf,
745 size_t len)
746 {
747 struct dlm_comm *comm;
748 unsigned int mark;
749 int rc;
750
751 rc = kstrtouint(buf, 0, &mark);
752 if (rc)
753 return rc;
754
755 if (mark == 0)
756 mark = dlm_config.ci_mark;
757
758 comm = config_item_to_comm(item);
759 rc = dlm_lowcomms_nodes_set_mark(comm->nodeid, mark);
760 if (rc)
761 return rc;
762
763 comm->mark = mark;
764 return len;
765 }
766
767 CONFIGFS_ATTR(comm_, nodeid);
768 CONFIGFS_ATTR(comm_, local);
769 CONFIGFS_ATTR(comm_, mark);
770 CONFIGFS_ATTR_WO(comm_, addr);
771 CONFIGFS_ATTR_RO(comm_, addr_list);
772
773 static struct configfs_attribute *comm_attrs[] = {
774 [COMM_ATTR_NODEID] = &comm_attr_nodeid,
775 [COMM_ATTR_LOCAL] = &comm_attr_local,
776 [COMM_ATTR_ADDR] = &comm_attr_addr,
777 [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
778 [COMM_ATTR_MARK] = &comm_attr_mark,
779 NULL,
780 };
781
node_nodeid_show(struct config_item * item,char * buf)782 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
783 {
784 unsigned int nodeid;
785 int rv;
786
787 rv = kstrtouint(config_item_name(item), 0, &nodeid);
788 if (WARN_ON(rv))
789 return rv;
790
791 return sprintf(buf, "%u\n", nodeid);
792 }
793
node_nodeid_store(struct config_item * item,const char * buf,size_t len)794 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
795 size_t len)
796 {
797 return len;
798 }
799
node_weight_show(struct config_item * item,char * buf)800 static ssize_t node_weight_show(struct config_item *item, char *buf)
801 {
802 return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
803 }
804
node_weight_store(struct config_item * item,const char * buf,size_t len)805 static ssize_t node_weight_store(struct config_item *item, const char *buf,
806 size_t len)
807 {
808 int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
809
810 if (rc)
811 return rc;
812 return len;
813 }
814
815 CONFIGFS_ATTR(node_, nodeid);
816 CONFIGFS_ATTR(node_, weight);
817
818 static struct configfs_attribute *node_attrs[] = {
819 [NODE_ATTR_NODEID] = &node_attr_nodeid,
820 [NODE_ATTR_WEIGHT] = &node_attr_weight,
821 NULL,
822 };
823
824 /*
825 * Functions for the dlm to get the info that's been configured
826 */
827
get_space(char * name)828 static struct dlm_space *get_space(char *name)
829 {
830 struct config_item *i;
831
832 if (!space_list)
833 return NULL;
834
835 mutex_lock(&space_list->cg_subsys->su_mutex);
836 i = config_group_find_item(space_list, name);
837 mutex_unlock(&space_list->cg_subsys->su_mutex);
838
839 return config_item_to_space(i);
840 }
841
put_space(struct dlm_space * sp)842 static void put_space(struct dlm_space *sp)
843 {
844 config_item_put(&sp->group.cg_item);
845 }
846
get_comm(int nodeid)847 static struct dlm_comm *get_comm(int nodeid)
848 {
849 struct config_item *i;
850 struct dlm_comm *cm = NULL;
851 int found = 0;
852
853 if (!comm_list)
854 return NULL;
855
856 WARN_ON_ONCE(!mutex_is_locked(&clusters_root.subsys.su_mutex));
857
858 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
859 cm = config_item_to_comm(i);
860
861 if (cm->nodeid != nodeid)
862 continue;
863 found = 1;
864 config_item_get(i);
865 break;
866 }
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,bool locked)926 int dlm_comm_seq(int nodeid, uint32_t *seq, bool locked)
927 {
928 struct dlm_comm *cm;
929
930 if (locked) {
931 cm = get_comm(nodeid);
932 } else {
933 mutex_lock(&clusters_root.subsys.su_mutex);
934 cm = get_comm(nodeid);
935 mutex_unlock(&clusters_root.subsys.su_mutex);
936 }
937 if (!cm)
938 return -EEXIST;
939
940 *seq = cm->seq;
941 put_comm(cm);
942 return 0;
943 }
944
dlm_our_nodeid(void)945 int dlm_our_nodeid(void)
946 {
947 return local_comm->nodeid;
948 }
949
950 /* num 0 is first addr, num 1 is second addr */
dlm_our_addr(struct sockaddr_storage * addr,int num)951 int dlm_our_addr(struct sockaddr_storage *addr, int num)
952 {
953 if (!local_comm)
954 return -1;
955 if (num + 1 > local_comm->addr_count)
956 return -1;
957 memcpy(addr, local_comm->addr[num], sizeof(*addr));
958 return 0;
959 }
960
961 /* Config file defaults */
962 #define DEFAULT_TCP_PORT 21064
963 #define DEFAULT_RSBTBL_SIZE 1024
964 #define DEFAULT_RECOVER_TIMER 5
965 #define DEFAULT_TOSS_SECS 10
966 #define DEFAULT_SCAN_SECS 5
967 #define DEFAULT_LOG_DEBUG 0
968 #define DEFAULT_LOG_INFO 1
969 #define DEFAULT_PROTOCOL DLM_PROTO_TCP
970 #define DEFAULT_MARK 0
971 #define DEFAULT_NEW_RSB_COUNT 128
972 #define DEFAULT_RECOVER_CALLBACKS 0
973 #define DEFAULT_CLUSTER_NAME ""
974
975 struct dlm_config_info dlm_config = {
976 .ci_tcp_port = cpu_to_be16(DEFAULT_TCP_PORT),
977 .ci_buffer_size = DLM_MAX_SOCKET_BUFSIZE,
978 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
979 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
980 .ci_toss_secs = DEFAULT_TOSS_SECS,
981 .ci_scan_secs = DEFAULT_SCAN_SECS,
982 .ci_log_debug = DEFAULT_LOG_DEBUG,
983 .ci_log_info = DEFAULT_LOG_INFO,
984 .ci_protocol = DEFAULT_PROTOCOL,
985 .ci_mark = DEFAULT_MARK,
986 .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
987 .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
988 .ci_cluster_name = DEFAULT_CLUSTER_NAME
989 };
990
991