Loading...
1/******************************************************************************
2*******************************************************************************
3**
4** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5** Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
6**
7** This copyrighted material is made available to anyone wishing to use,
8** modify, copy, or redistribute it subject to the terms and conditions
9** of the GNU General Public License v.2.
10**
11*******************************************************************************
12******************************************************************************/
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/configfs.h>
17#include <linux/slab.h>
18#include <linux/in.h>
19#include <linux/in6.h>
20#include <net/ipv6.h>
21#include <net/sock.h>
22
23#include "config.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
36static struct config_group *space_list;
37static struct config_group *comm_list;
38static struct dlm_comm *local_comm;
39
40struct dlm_clusters;
41struct dlm_cluster;
42struct dlm_spaces;
43struct dlm_space;
44struct dlm_comms;
45struct dlm_comm;
46struct dlm_nodes;
47struct dlm_node;
48
49static struct config_group *make_cluster(struct config_group *, const char *);
50static void drop_cluster(struct config_group *, struct config_item *);
51static void release_cluster(struct config_item *);
52static struct config_group *make_space(struct config_group *, const char *);
53static void drop_space(struct config_group *, struct config_item *);
54static void release_space(struct config_item *);
55static struct config_item *make_comm(struct config_group *, const char *);
56static void drop_comm(struct config_group *, struct config_item *);
57static void release_comm(struct config_item *);
58static struct config_item *make_node(struct config_group *, const char *);
59static void drop_node(struct config_group *, struct config_item *);
60static void release_node(struct config_item *);
61
62static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
63 char *buf);
64static ssize_t store_cluster(struct config_item *i,
65 struct configfs_attribute *a,
66 const char *buf, size_t len);
67static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
68 char *buf);
69static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
70 const char *buf, size_t len);
71static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
72 char *buf);
73static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
74 const char *buf, size_t len);
75
76static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf);
77static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
78 size_t len);
79static ssize_t comm_local_read(struct dlm_comm *cm, char *buf);
80static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
81 size_t len);
82static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf,
83 size_t len);
84static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf);
85static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf);
86static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
87 size_t len);
88static ssize_t node_weight_read(struct dlm_node *nd, char *buf);
89static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
90 size_t len);
91
92struct dlm_cluster {
93 struct config_group group;
94 unsigned int cl_tcp_port;
95 unsigned int cl_buffer_size;
96 unsigned int cl_rsbtbl_size;
97 unsigned int cl_dirtbl_size;
98 unsigned int cl_recover_timer;
99 unsigned int cl_toss_secs;
100 unsigned int cl_scan_secs;
101 unsigned int cl_log_debug;
102 unsigned int cl_protocol;
103 unsigned int cl_timewarn_cs;
104 unsigned int cl_waitwarn_us;
105 unsigned int cl_new_rsb_count;
106};
107
108enum {
109 CLUSTER_ATTR_TCP_PORT = 0,
110 CLUSTER_ATTR_BUFFER_SIZE,
111 CLUSTER_ATTR_RSBTBL_SIZE,
112 CLUSTER_ATTR_DIRTBL_SIZE,
113 CLUSTER_ATTR_RECOVER_TIMER,
114 CLUSTER_ATTR_TOSS_SECS,
115 CLUSTER_ATTR_SCAN_SECS,
116 CLUSTER_ATTR_LOG_DEBUG,
117 CLUSTER_ATTR_PROTOCOL,
118 CLUSTER_ATTR_TIMEWARN_CS,
119 CLUSTER_ATTR_WAITWARN_US,
120 CLUSTER_ATTR_NEW_RSB_COUNT,
121};
122
123struct cluster_attribute {
124 struct configfs_attribute attr;
125 ssize_t (*show)(struct dlm_cluster *, char *);
126 ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
127};
128
129static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
130 int *info_field, int check_zero,
131 const char *buf, size_t len)
132{
133 unsigned int x;
134
135 if (!capable(CAP_SYS_ADMIN))
136 return -EACCES;
137
138 x = simple_strtoul(buf, NULL, 0);
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) \
150static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
151{ \
152 return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \
153 check_zero, buf, len); \
154} \
155static ssize_t name##_read(struct dlm_cluster *cl, char *buf) \
156{ \
157 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
158} \
159static struct cluster_attribute cluster_attr_##name = \
160__CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
161
162CLUSTER_ATTR(tcp_port, 1);
163CLUSTER_ATTR(buffer_size, 1);
164CLUSTER_ATTR(rsbtbl_size, 1);
165CLUSTER_ATTR(dirtbl_size, 1);
166CLUSTER_ATTR(recover_timer, 1);
167CLUSTER_ATTR(toss_secs, 1);
168CLUSTER_ATTR(scan_secs, 1);
169CLUSTER_ATTR(log_debug, 0);
170CLUSTER_ATTR(protocol, 0);
171CLUSTER_ATTR(timewarn_cs, 1);
172CLUSTER_ATTR(waitwarn_us, 0);
173CLUSTER_ATTR(new_rsb_count, 0);
174
175static struct configfs_attribute *cluster_attrs[] = {
176 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
177 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
178 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
179 [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr,
180 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
181 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
182 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
183 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
184 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
185 [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
186 [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr,
187 [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count.attr,
188 NULL,
189};
190
191enum {
192 COMM_ATTR_NODEID = 0,
193 COMM_ATTR_LOCAL,
194 COMM_ATTR_ADDR,
195 COMM_ATTR_ADDR_LIST,
196};
197
198struct comm_attribute {
199 struct configfs_attribute attr;
200 ssize_t (*show)(struct dlm_comm *, char *);
201 ssize_t (*store)(struct dlm_comm *, const char *, size_t);
202};
203
204static struct comm_attribute comm_attr_nodeid = {
205 .attr = { .ca_owner = THIS_MODULE,
206 .ca_name = "nodeid",
207 .ca_mode = S_IRUGO | S_IWUSR },
208 .show = comm_nodeid_read,
209 .store = comm_nodeid_write,
210};
211
212static struct comm_attribute comm_attr_local = {
213 .attr = { .ca_owner = THIS_MODULE,
214 .ca_name = "local",
215 .ca_mode = S_IRUGO | S_IWUSR },
216 .show = comm_local_read,
217 .store = comm_local_write,
218};
219
220static struct comm_attribute comm_attr_addr = {
221 .attr = { .ca_owner = THIS_MODULE,
222 .ca_name = "addr",
223 .ca_mode = S_IWUSR },
224 .store = comm_addr_write,
225};
226
227static struct comm_attribute comm_attr_addr_list = {
228 .attr = { .ca_owner = THIS_MODULE,
229 .ca_name = "addr_list",
230 .ca_mode = S_IRUGO },
231 .show = comm_addr_list_read,
232};
233
234static struct configfs_attribute *comm_attrs[] = {
235 [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
236 [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
237 [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
238 [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list.attr,
239 NULL,
240};
241
242enum {
243 NODE_ATTR_NODEID = 0,
244 NODE_ATTR_WEIGHT,
245};
246
247struct node_attribute {
248 struct configfs_attribute attr;
249 ssize_t (*show)(struct dlm_node *, char *);
250 ssize_t (*store)(struct dlm_node *, const char *, size_t);
251};
252
253static struct node_attribute node_attr_nodeid = {
254 .attr = { .ca_owner = THIS_MODULE,
255 .ca_name = "nodeid",
256 .ca_mode = S_IRUGO | S_IWUSR },
257 .show = node_nodeid_read,
258 .store = node_nodeid_write,
259};
260
261static struct node_attribute node_attr_weight = {
262 .attr = { .ca_owner = THIS_MODULE,
263 .ca_name = "weight",
264 .ca_mode = S_IRUGO | S_IWUSR },
265 .show = node_weight_read,
266 .store = node_weight_write,
267};
268
269static struct configfs_attribute *node_attrs[] = {
270 [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
271 [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
272 NULL,
273};
274
275struct dlm_clusters {
276 struct configfs_subsystem subsys;
277};
278
279struct dlm_spaces {
280 struct config_group ss_group;
281};
282
283struct dlm_space {
284 struct config_group group;
285 struct list_head members;
286 struct mutex members_lock;
287 int members_count;
288};
289
290struct dlm_comms {
291 struct config_group cs_group;
292};
293
294struct dlm_comm {
295 struct config_item item;
296 int nodeid;
297 int local;
298 int addr_count;
299 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
300};
301
302struct dlm_nodes {
303 struct config_group ns_group;
304};
305
306struct dlm_node {
307 struct config_item item;
308 struct list_head list; /* space->members */
309 int nodeid;
310 int weight;
311 int new;
312};
313
314static struct configfs_group_operations clusters_ops = {
315 .make_group = make_cluster,
316 .drop_item = drop_cluster,
317};
318
319static struct configfs_item_operations cluster_ops = {
320 .release = release_cluster,
321 .show_attribute = show_cluster,
322 .store_attribute = store_cluster,
323};
324
325static struct configfs_group_operations spaces_ops = {
326 .make_group = make_space,
327 .drop_item = drop_space,
328};
329
330static struct configfs_item_operations space_ops = {
331 .release = release_space,
332};
333
334static struct configfs_group_operations comms_ops = {
335 .make_item = make_comm,
336 .drop_item = drop_comm,
337};
338
339static struct configfs_item_operations comm_ops = {
340 .release = release_comm,
341 .show_attribute = show_comm,
342 .store_attribute = store_comm,
343};
344
345static struct configfs_group_operations nodes_ops = {
346 .make_item = make_node,
347 .drop_item = drop_node,
348};
349
350static struct configfs_item_operations node_ops = {
351 .release = release_node,
352 .show_attribute = show_node,
353 .store_attribute = store_node,
354};
355
356static struct config_item_type clusters_type = {
357 .ct_group_ops = &clusters_ops,
358 .ct_owner = THIS_MODULE,
359};
360
361static struct config_item_type cluster_type = {
362 .ct_item_ops = &cluster_ops,
363 .ct_attrs = cluster_attrs,
364 .ct_owner = THIS_MODULE,
365};
366
367static struct config_item_type spaces_type = {
368 .ct_group_ops = &spaces_ops,
369 .ct_owner = THIS_MODULE,
370};
371
372static struct config_item_type space_type = {
373 .ct_item_ops = &space_ops,
374 .ct_owner = THIS_MODULE,
375};
376
377static struct config_item_type comms_type = {
378 .ct_group_ops = &comms_ops,
379 .ct_owner = THIS_MODULE,
380};
381
382static struct config_item_type comm_type = {
383 .ct_item_ops = &comm_ops,
384 .ct_attrs = comm_attrs,
385 .ct_owner = THIS_MODULE,
386};
387
388static struct config_item_type nodes_type = {
389 .ct_group_ops = &nodes_ops,
390 .ct_owner = THIS_MODULE,
391};
392
393static struct config_item_type node_type = {
394 .ct_item_ops = &node_ops,
395 .ct_attrs = node_attrs,
396 .ct_owner = THIS_MODULE,
397};
398
399static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
400{
401 return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
402 NULL;
403}
404
405static struct dlm_space *config_item_to_space(struct config_item *i)
406{
407 return i ? container_of(to_config_group(i), struct dlm_space, group) :
408 NULL;
409}
410
411static struct dlm_comm *config_item_to_comm(struct config_item *i)
412{
413 return i ? container_of(i, struct dlm_comm, item) : NULL;
414}
415
416static struct dlm_node *config_item_to_node(struct config_item *i)
417{
418 return i ? container_of(i, struct dlm_node, item) : NULL;
419}
420
421static struct config_group *make_cluster(struct config_group *g,
422 const char *name)
423{
424 struct dlm_cluster *cl = NULL;
425 struct dlm_spaces *sps = NULL;
426 struct dlm_comms *cms = NULL;
427 void *gps = NULL;
428
429 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
430 gps = kcalloc(3, sizeof(struct config_group *), GFP_NOFS);
431 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
432 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
433
434 if (!cl || !gps || !sps || !cms)
435 goto fail;
436
437 config_group_init_type_name(&cl->group, name, &cluster_type);
438 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
439 config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
440
441 cl->group.default_groups = gps;
442 cl->group.default_groups[0] = &sps->ss_group;
443 cl->group.default_groups[1] = &cms->cs_group;
444 cl->group.default_groups[2] = NULL;
445
446 cl->cl_tcp_port = dlm_config.ci_tcp_port;
447 cl->cl_buffer_size = dlm_config.ci_buffer_size;
448 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
449 cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
450 cl->cl_recover_timer = dlm_config.ci_recover_timer;
451 cl->cl_toss_secs = dlm_config.ci_toss_secs;
452 cl->cl_scan_secs = dlm_config.ci_scan_secs;
453 cl->cl_log_debug = dlm_config.ci_log_debug;
454 cl->cl_protocol = dlm_config.ci_protocol;
455 cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
456 cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
457 cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
458
459 space_list = &sps->ss_group;
460 comm_list = &cms->cs_group;
461 return &cl->group;
462
463 fail:
464 kfree(cl);
465 kfree(gps);
466 kfree(sps);
467 kfree(cms);
468 return ERR_PTR(-ENOMEM);
469}
470
471static void drop_cluster(struct config_group *g, struct config_item *i)
472{
473 struct dlm_cluster *cl = config_item_to_cluster(i);
474 struct config_item *tmp;
475 int j;
476
477 for (j = 0; cl->group.default_groups[j]; j++) {
478 tmp = &cl->group.default_groups[j]->cg_item;
479 cl->group.default_groups[j] = NULL;
480 config_item_put(tmp);
481 }
482
483 space_list = NULL;
484 comm_list = NULL;
485
486 config_item_put(i);
487}
488
489static void release_cluster(struct config_item *i)
490{
491 struct dlm_cluster *cl = config_item_to_cluster(i);
492 kfree(cl->group.default_groups);
493 kfree(cl);
494}
495
496static struct config_group *make_space(struct config_group *g, const char *name)
497{
498 struct dlm_space *sp = NULL;
499 struct dlm_nodes *nds = NULL;
500 void *gps = NULL;
501
502 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
503 gps = kcalloc(2, sizeof(struct config_group *), GFP_NOFS);
504 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
505
506 if (!sp || !gps || !nds)
507 goto fail;
508
509 config_group_init_type_name(&sp->group, name, &space_type);
510 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
511
512 sp->group.default_groups = gps;
513 sp->group.default_groups[0] = &nds->ns_group;
514 sp->group.default_groups[1] = NULL;
515
516 INIT_LIST_HEAD(&sp->members);
517 mutex_init(&sp->members_lock);
518 sp->members_count = 0;
519 return &sp->group;
520
521 fail:
522 kfree(sp);
523 kfree(gps);
524 kfree(nds);
525 return ERR_PTR(-ENOMEM);
526}
527
528static void drop_space(struct config_group *g, struct config_item *i)
529{
530 struct dlm_space *sp = config_item_to_space(i);
531 struct config_item *tmp;
532 int j;
533
534 /* assert list_empty(&sp->members) */
535
536 for (j = 0; sp->group.default_groups[j]; j++) {
537 tmp = &sp->group.default_groups[j]->cg_item;
538 sp->group.default_groups[j] = NULL;
539 config_item_put(tmp);
540 }
541
542 config_item_put(i);
543}
544
545static void release_space(struct config_item *i)
546{
547 struct dlm_space *sp = config_item_to_space(i);
548 kfree(sp->group.default_groups);
549 kfree(sp);
550}
551
552static struct config_item *make_comm(struct config_group *g, const char *name)
553{
554 struct dlm_comm *cm;
555
556 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
557 if (!cm)
558 return ERR_PTR(-ENOMEM);
559
560 config_item_init_type_name(&cm->item, name, &comm_type);
561 cm->nodeid = -1;
562 cm->local = 0;
563 cm->addr_count = 0;
564 return &cm->item;
565}
566
567static void drop_comm(struct config_group *g, struct config_item *i)
568{
569 struct dlm_comm *cm = config_item_to_comm(i);
570 if (local_comm == cm)
571 local_comm = NULL;
572 dlm_lowcomms_close(cm->nodeid);
573 while (cm->addr_count--)
574 kfree(cm->addr[cm->addr_count]);
575 config_item_put(i);
576}
577
578static void release_comm(struct config_item *i)
579{
580 struct dlm_comm *cm = config_item_to_comm(i);
581 kfree(cm);
582}
583
584static struct config_item *make_node(struct config_group *g, const char *name)
585{
586 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
587 struct dlm_node *nd;
588
589 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
590 if (!nd)
591 return ERR_PTR(-ENOMEM);
592
593 config_item_init_type_name(&nd->item, name, &node_type);
594 nd->nodeid = -1;
595 nd->weight = 1; /* default weight of 1 if none is set */
596 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
597
598 mutex_lock(&sp->members_lock);
599 list_add(&nd->list, &sp->members);
600 sp->members_count++;
601 mutex_unlock(&sp->members_lock);
602
603 return &nd->item;
604}
605
606static void drop_node(struct config_group *g, struct config_item *i)
607{
608 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
609 struct dlm_node *nd = config_item_to_node(i);
610
611 mutex_lock(&sp->members_lock);
612 list_del(&nd->list);
613 sp->members_count--;
614 mutex_unlock(&sp->members_lock);
615
616 config_item_put(i);
617}
618
619static void release_node(struct config_item *i)
620{
621 struct dlm_node *nd = config_item_to_node(i);
622 kfree(nd);
623}
624
625static struct dlm_clusters clusters_root = {
626 .subsys = {
627 .su_group = {
628 .cg_item = {
629 .ci_namebuf = "dlm",
630 .ci_type = &clusters_type,
631 },
632 },
633 },
634};
635
636int __init dlm_config_init(void)
637{
638 config_group_init(&clusters_root.subsys.su_group);
639 mutex_init(&clusters_root.subsys.su_mutex);
640 return configfs_register_subsystem(&clusters_root.subsys);
641}
642
643void dlm_config_exit(void)
644{
645 configfs_unregister_subsystem(&clusters_root.subsys);
646}
647
648/*
649 * Functions for user space to read/write attributes
650 */
651
652static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
653 char *buf)
654{
655 struct dlm_cluster *cl = config_item_to_cluster(i);
656 struct cluster_attribute *cla =
657 container_of(a, struct cluster_attribute, attr);
658 return cla->show ? cla->show(cl, buf) : 0;
659}
660
661static ssize_t store_cluster(struct config_item *i,
662 struct configfs_attribute *a,
663 const char *buf, size_t len)
664{
665 struct dlm_cluster *cl = config_item_to_cluster(i);
666 struct cluster_attribute *cla =
667 container_of(a, struct cluster_attribute, attr);
668 return cla->store ? cla->store(cl, buf, len) : -EINVAL;
669}
670
671static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
672 char *buf)
673{
674 struct dlm_comm *cm = config_item_to_comm(i);
675 struct comm_attribute *cma =
676 container_of(a, struct comm_attribute, attr);
677 return cma->show ? cma->show(cm, buf) : 0;
678}
679
680static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
681 const char *buf, size_t len)
682{
683 struct dlm_comm *cm = config_item_to_comm(i);
684 struct comm_attribute *cma =
685 container_of(a, struct comm_attribute, attr);
686 return cma->store ? cma->store(cm, buf, len) : -EINVAL;
687}
688
689static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf)
690{
691 return sprintf(buf, "%d\n", cm->nodeid);
692}
693
694static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
695 size_t len)
696{
697 cm->nodeid = simple_strtol(buf, NULL, 0);
698 return len;
699}
700
701static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
702{
703 return sprintf(buf, "%d\n", cm->local);
704}
705
706static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
707 size_t len)
708{
709 cm->local= simple_strtol(buf, NULL, 0);
710 if (cm->local && !local_comm)
711 local_comm = cm;
712 return len;
713}
714
715static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
716{
717 struct sockaddr_storage *addr;
718
719 if (len != sizeof(struct sockaddr_storage))
720 return -EINVAL;
721
722 if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
723 return -ENOSPC;
724
725 addr = kzalloc(sizeof(*addr), GFP_NOFS);
726 if (!addr)
727 return -ENOMEM;
728
729 memcpy(addr, buf, len);
730 cm->addr[cm->addr_count++] = addr;
731 return len;
732}
733
734static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf)
735{
736 ssize_t s;
737 ssize_t allowance;
738 int i;
739 struct sockaddr_storage *addr;
740 struct sockaddr_in *addr_in;
741 struct sockaddr_in6 *addr_in6;
742
743 /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
744 char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
745
746
747 /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
748 allowance = 4096;
749 buf[0] = '\0';
750
751 for (i = 0; i < cm->addr_count; i++) {
752 addr = cm->addr[i];
753
754 switch(addr->ss_family) {
755 case AF_INET:
756 addr_in = (struct sockaddr_in *)addr;
757 s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr);
758 break;
759 case AF_INET6:
760 addr_in6 = (struct sockaddr_in6 *)addr;
761 s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr);
762 break;
763 default:
764 s = sprintf(buf0, "%s\n", "<UNKNOWN>");
765 break;
766 }
767 allowance -= s;
768 if (allowance >= 0)
769 strcat(buf, buf0);
770 else {
771 allowance += s;
772 break;
773 }
774 }
775 return 4096 - allowance;
776}
777
778static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
779 char *buf)
780{
781 struct dlm_node *nd = config_item_to_node(i);
782 struct node_attribute *nda =
783 container_of(a, struct node_attribute, attr);
784 return nda->show ? nda->show(nd, buf) : 0;
785}
786
787static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
788 const char *buf, size_t len)
789{
790 struct dlm_node *nd = config_item_to_node(i);
791 struct node_attribute *nda =
792 container_of(a, struct node_attribute, attr);
793 return nda->store ? nda->store(nd, buf, len) : -EINVAL;
794}
795
796static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
797{
798 return sprintf(buf, "%d\n", nd->nodeid);
799}
800
801static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
802 size_t len)
803{
804 nd->nodeid = simple_strtol(buf, NULL, 0);
805 return len;
806}
807
808static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
809{
810 return sprintf(buf, "%d\n", nd->weight);
811}
812
813static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
814 size_t len)
815{
816 nd->weight = simple_strtol(buf, NULL, 0);
817 return len;
818}
819
820/*
821 * Functions for the dlm to get the info that's been configured
822 */
823
824static struct dlm_space *get_space(char *name)
825{
826 struct config_item *i;
827
828 if (!space_list)
829 return NULL;
830
831 mutex_lock(&space_list->cg_subsys->su_mutex);
832 i = config_group_find_item(space_list, name);
833 mutex_unlock(&space_list->cg_subsys->su_mutex);
834
835 return config_item_to_space(i);
836}
837
838static void put_space(struct dlm_space *sp)
839{
840 config_item_put(&sp->group.cg_item);
841}
842
843static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y)
844{
845 switch (x->ss_family) {
846 case AF_INET: {
847 struct sockaddr_in *sinx = (struct sockaddr_in *)x;
848 struct sockaddr_in *siny = (struct sockaddr_in *)y;
849 if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr)
850 return 0;
851 if (sinx->sin_port != siny->sin_port)
852 return 0;
853 break;
854 }
855 case AF_INET6: {
856 struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x;
857 struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y;
858 if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr))
859 return 0;
860 if (sinx->sin6_port != siny->sin6_port)
861 return 0;
862 break;
863 }
864 default:
865 return 0;
866 }
867 return 1;
868}
869
870static struct dlm_comm *get_comm(int nodeid, struct sockaddr_storage *addr)
871{
872 struct config_item *i;
873 struct dlm_comm *cm = NULL;
874 int found = 0;
875
876 if (!comm_list)
877 return NULL;
878
879 mutex_lock(&clusters_root.subsys.su_mutex);
880
881 list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
882 cm = config_item_to_comm(i);
883
884 if (nodeid) {
885 if (cm->nodeid != nodeid)
886 continue;
887 found = 1;
888 config_item_get(i);
889 break;
890 } else {
891 if (!cm->addr_count || !addr_compare(cm->addr[0], addr))
892 continue;
893 found = 1;
894 config_item_get(i);
895 break;
896 }
897 }
898 mutex_unlock(&clusters_root.subsys.su_mutex);
899
900 if (!found)
901 cm = NULL;
902 return cm;
903}
904
905static void put_comm(struct dlm_comm *cm)
906{
907 config_item_put(&cm->item);
908}
909
910/* caller must free mem */
911int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out,
912 int **new_out, int *new_count_out)
913{
914 struct dlm_space *sp;
915 struct dlm_node *nd;
916 int i = 0, rv = 0, ids_count = 0, new_count = 0;
917 int *ids, *new;
918
919 sp = get_space(lsname);
920 if (!sp)
921 return -EEXIST;
922
923 mutex_lock(&sp->members_lock);
924 if (!sp->members_count) {
925 rv = -EINVAL;
926 printk(KERN_ERR "dlm: zero members_count\n");
927 goto out;
928 }
929
930 ids_count = sp->members_count;
931
932 ids = kcalloc(ids_count, sizeof(int), GFP_NOFS);
933 if (!ids) {
934 rv = -ENOMEM;
935 goto out;
936 }
937
938 list_for_each_entry(nd, &sp->members, list) {
939 ids[i++] = nd->nodeid;
940 if (nd->new)
941 new_count++;
942 }
943
944 if (ids_count != i)
945 printk(KERN_ERR "dlm: bad nodeid count %d %d\n", ids_count, i);
946
947 if (!new_count)
948 goto out_ids;
949
950 new = kcalloc(new_count, sizeof(int), GFP_NOFS);
951 if (!new) {
952 kfree(ids);
953 rv = -ENOMEM;
954 goto out;
955 }
956
957 i = 0;
958 list_for_each_entry(nd, &sp->members, list) {
959 if (nd->new) {
960 new[i++] = nd->nodeid;
961 nd->new = 0;
962 }
963 }
964 *new_count_out = new_count;
965 *new_out = new;
966
967 out_ids:
968 *ids_count_out = ids_count;
969 *ids_out = ids;
970 out:
971 mutex_unlock(&sp->members_lock);
972 put_space(sp);
973 return rv;
974}
975
976int dlm_node_weight(char *lsname, int nodeid)
977{
978 struct dlm_space *sp;
979 struct dlm_node *nd;
980 int w = -EEXIST;
981
982 sp = get_space(lsname);
983 if (!sp)
984 goto out;
985
986 mutex_lock(&sp->members_lock);
987 list_for_each_entry(nd, &sp->members, list) {
988 if (nd->nodeid != nodeid)
989 continue;
990 w = nd->weight;
991 break;
992 }
993 mutex_unlock(&sp->members_lock);
994 put_space(sp);
995 out:
996 return w;
997}
998
999int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
1000{
1001 struct dlm_comm *cm = get_comm(nodeid, NULL);
1002 if (!cm)
1003 return -EEXIST;
1004 if (!cm->addr_count)
1005 return -ENOENT;
1006 memcpy(addr, cm->addr[0], sizeof(*addr));
1007 put_comm(cm);
1008 return 0;
1009}
1010
1011int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
1012{
1013 struct dlm_comm *cm = get_comm(0, addr);
1014 if (!cm)
1015 return -EEXIST;
1016 *nodeid = cm->nodeid;
1017 put_comm(cm);
1018 return 0;
1019}
1020
1021int dlm_our_nodeid(void)
1022{
1023 return local_comm ? local_comm->nodeid : 0;
1024}
1025
1026/* num 0 is first addr, num 1 is second addr */
1027int dlm_our_addr(struct sockaddr_storage *addr, int num)
1028{
1029 if (!local_comm)
1030 return -1;
1031 if (num + 1 > local_comm->addr_count)
1032 return -1;
1033 memcpy(addr, local_comm->addr[num], sizeof(*addr));
1034 return 0;
1035}
1036
1037/* Config file defaults */
1038#define DEFAULT_TCP_PORT 21064
1039#define DEFAULT_BUFFER_SIZE 4096
1040#define DEFAULT_RSBTBL_SIZE 1024
1041#define DEFAULT_DIRTBL_SIZE 1024
1042#define DEFAULT_RECOVER_TIMER 5
1043#define DEFAULT_TOSS_SECS 10
1044#define DEFAULT_SCAN_SECS 5
1045#define DEFAULT_LOG_DEBUG 0
1046#define DEFAULT_PROTOCOL 0
1047#define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */
1048#define DEFAULT_WAITWARN_US 0
1049#define DEFAULT_NEW_RSB_COUNT 128
1050
1051struct dlm_config_info dlm_config = {
1052 .ci_tcp_port = DEFAULT_TCP_PORT,
1053 .ci_buffer_size = DEFAULT_BUFFER_SIZE,
1054 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
1055 .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
1056 .ci_recover_timer = DEFAULT_RECOVER_TIMER,
1057 .ci_toss_secs = DEFAULT_TOSS_SECS,
1058 .ci_scan_secs = DEFAULT_SCAN_SECS,
1059 .ci_log_debug = DEFAULT_LOG_DEBUG,
1060 .ci_protocol = DEFAULT_PROTOCOL,
1061 .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
1062 .ci_waitwarn_us = DEFAULT_WAITWARN_US,
1063 .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT
1064};
1065
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
35static struct config_group *space_list;
36static struct config_group *comm_list;
37static struct dlm_comm *local_comm;
38static uint32_t dlm_comm_count;
39
40struct dlm_clusters;
41struct dlm_cluster;
42struct dlm_spaces;
43struct dlm_space;
44struct dlm_comms;
45struct dlm_comm;
46struct dlm_nodes;
47struct dlm_node;
48
49static struct config_group *make_cluster(struct config_group *, const char *);
50static void drop_cluster(struct config_group *, struct config_item *);
51static void release_cluster(struct config_item *);
52static struct config_group *make_space(struct config_group *, const char *);
53static void drop_space(struct config_group *, struct config_item *);
54static void release_space(struct config_item *);
55static struct config_item *make_comm(struct config_group *, const char *);
56static void drop_comm(struct config_group *, struct config_item *);
57static void release_comm(struct config_item *);
58static struct config_item *make_node(struct config_group *, const char *);
59static void drop_node(struct config_group *, struct config_item *);
60static void release_node(struct config_item *);
61
62static struct configfs_attribute *comm_attrs[];
63static struct configfs_attribute *node_attrs[];
64
65struct 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
84static 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
90enum {
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
108static 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
114static 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
125CONFIGFS_ATTR(cluster_, cluster_name);
126
127static 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) \
150static 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} \
157static 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} \
162CONFIGFS_ATTR(cluster_, name);
163
164CLUSTER_ATTR(tcp_port, 1);
165CLUSTER_ATTR(buffer_size, 1);
166CLUSTER_ATTR(rsbtbl_size, 1);
167CLUSTER_ATTR(recover_timer, 1);
168CLUSTER_ATTR(toss_secs, 1);
169CLUSTER_ATTR(scan_secs, 1);
170CLUSTER_ATTR(log_debug, 0);
171CLUSTER_ATTR(log_info, 0);
172CLUSTER_ATTR(protocol, 0);
173CLUSTER_ATTR(mark, 0);
174CLUSTER_ATTR(timewarn_cs, 1);
175CLUSTER_ATTR(waitwarn_us, 0);
176CLUSTER_ATTR(new_rsb_count, 0);
177CLUSTER_ATTR(recover_callbacks, 0);
178
179static 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
198enum {
199 COMM_ATTR_NODEID = 0,
200 COMM_ATTR_LOCAL,
201 COMM_ATTR_ADDR,
202 COMM_ATTR_ADDR_LIST,
203 COMM_ATTR_MARK,
204};
205
206enum {
207 NODE_ATTR_NODEID = 0,
208 NODE_ATTR_WEIGHT,
209};
210
211struct dlm_clusters {
212 struct configfs_subsystem subsys;
213};
214
215struct dlm_spaces {
216 struct config_group ss_group;
217};
218
219struct dlm_space {
220 struct config_group group;
221 struct list_head members;
222 struct mutex members_lock;
223 int members_count;
224};
225
226struct dlm_comms {
227 struct config_group cs_group;
228};
229
230struct 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
240struct dlm_nodes {
241 struct config_group ns_group;
242};
243
244struct 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
253static struct configfs_group_operations clusters_ops = {
254 .make_group = make_cluster,
255 .drop_item = drop_cluster,
256};
257
258static struct configfs_item_operations cluster_ops = {
259 .release = release_cluster,
260};
261
262static struct configfs_group_operations spaces_ops = {
263 .make_group = make_space,
264 .drop_item = drop_space,
265};
266
267static struct configfs_item_operations space_ops = {
268 .release = release_space,
269};
270
271static struct configfs_group_operations comms_ops = {
272 .make_item = make_comm,
273 .drop_item = drop_comm,
274};
275
276static struct configfs_item_operations comm_ops = {
277 .release = release_comm,
278};
279
280static struct configfs_group_operations nodes_ops = {
281 .make_item = make_node,
282 .drop_item = drop_node,
283};
284
285static struct configfs_item_operations node_ops = {
286 .release = release_node,
287};
288
289static const struct config_item_type clusters_type = {
290 .ct_group_ops = &clusters_ops,
291 .ct_owner = THIS_MODULE,
292};
293
294static 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
300static const struct config_item_type spaces_type = {
301 .ct_group_ops = &spaces_ops,
302 .ct_owner = THIS_MODULE,
303};
304
305static const struct config_item_type space_type = {
306 .ct_item_ops = &space_ops,
307 .ct_owner = THIS_MODULE,
308};
309
310static const struct config_item_type comms_type = {
311 .ct_group_ops = &comms_ops,
312 .ct_owner = THIS_MODULE,
313};
314
315static 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
321static const struct config_item_type nodes_type = {
322 .ct_group_ops = &nodes_ops,
323 .ct_owner = THIS_MODULE,
324};
325
326static 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
332static 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
338static 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
343static 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
348static 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
396static 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
408static void release_cluster(struct config_item *i)
409{
410 struct dlm_cluster *cl = config_item_to_cluster(i);
411 kfree(cl);
412}
413
414static 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
441static 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
451static void release_space(struct config_item *i)
452{
453 struct dlm_space *sp = config_item_to_space(i);
454 kfree(sp);
455}
456
457static 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
478static 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
489static void release_comm(struct config_item *i)
490{
491 struct dlm_comm *cm = config_item_to_comm(i);
492 kfree(cm);
493}
494
495static 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
517static 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
530static void release_node(struct config_item *i)
531{
532 struct dlm_node *nd = config_item_to_node(i);
533 kfree(nd);
534}
535
536static 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
547int __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
554void 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
563static 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
568static 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
578static 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
583static 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
596static 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
625static 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
670static 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
675static 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
689CONFIGFS_ATTR(comm_, nodeid);
690CONFIGFS_ATTR(comm_, local);
691CONFIGFS_ATTR(comm_, mark);
692CONFIGFS_ATTR_WO(comm_, addr);
693CONFIGFS_ATTR_RO(comm_, addr_list);
694
695static 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
704static 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
709static 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
723static 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
728static 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
738CONFIGFS_ATTR(node_, nodeid);
739CONFIGFS_ATTR(node_, weight);
740
741static 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
751static 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
765static void put_space(struct dlm_space *sp)
766{
767 config_item_put(&sp->group.cg_item);
768}
769
770static 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
797static void put_comm(struct dlm_comm *cm)
798{
799 config_item_put(&cm->item);
800}
801
802/* caller must free mem */
803int 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
850int 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
860int 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
874int 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 */
880int 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
907struct 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