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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 "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
36static struct config_group *space_list;
37static struct config_group *comm_list;
38static struct dlm_comm *local_comm;
39static uint32_t dlm_comm_count;
40
41struct dlm_clusters;
42struct dlm_cluster;
43struct dlm_spaces;
44struct dlm_space;
45struct dlm_comms;
46struct dlm_comm;
47struct dlm_nodes;
48struct dlm_node;
49
50static struct config_group *make_cluster(struct config_group *, const char *);
51static void drop_cluster(struct config_group *, struct config_item *);
52static void release_cluster(struct config_item *);
53static struct config_group *make_space(struct config_group *, const char *);
54static void drop_space(struct config_group *, struct config_item *);
55static void release_space(struct config_item *);
56static struct config_item *make_comm(struct config_group *, const char *);
57static void drop_comm(struct config_group *, struct config_item *);
58static void release_comm(struct config_item *);
59static struct config_item *make_node(struct config_group *, const char *);
60static void drop_node(struct config_group *, struct config_item *);
61static void release_node(struct config_item *);
62
63static struct configfs_attribute *comm_attrs[];
64static struct configfs_attribute *node_attrs[];
65
66const 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
74struct dlm_cluster {
75 struct config_group group;
76 struct dlm_spaces *sps;
77 struct dlm_comms *cms;
78};
79
80static 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
86enum {
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
102static 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
107static 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
115CONFIGFS_ATTR(cluster_, cluster_name);
116
117static 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
122static 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
133static 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
154CONFIGFS_ATTR(cluster_, tcp_port);
155
156static 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) \
181static 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} \
186static 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} \
190CONFIGFS_ATTR(cluster_, name);
191
192static 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
211static int dlm_check_zero(unsigned int x)
212{
213 if (!x)
214 return -EINVAL;
215
216 return 0;
217}
218
219static 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
227CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
228CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
229CLUSTER_ATTR(recover_timer, dlm_check_zero);
230CLUSTER_ATTR(toss_secs, dlm_check_zero);
231CLUSTER_ATTR(scan_secs, dlm_check_zero);
232CLUSTER_ATTR(log_debug, NULL);
233CLUSTER_ATTR(log_info, NULL);
234CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
235CLUSTER_ATTR(mark, NULL);
236CLUSTER_ATTR(new_rsb_count, NULL);
237CLUSTER_ATTR(recover_callbacks, NULL);
238
239static 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
256enum {
257 COMM_ATTR_NODEID = 0,
258 COMM_ATTR_LOCAL,
259 COMM_ATTR_ADDR,
260 COMM_ATTR_ADDR_LIST,
261 COMM_ATTR_MARK,
262};
263
264enum {
265 NODE_ATTR_NODEID = 0,
266 NODE_ATTR_WEIGHT,
267};
268
269struct dlm_clusters {
270 struct configfs_subsystem subsys;
271};
272
273struct dlm_spaces {
274 struct config_group ss_group;
275};
276
277struct 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
285struct dlm_comms {
286 struct config_group cs_group;
287};
288
289struct 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
299struct dlm_nodes {
300 struct config_group ns_group;
301};
302
303struct 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
312static struct configfs_group_operations clusters_ops = {
313 .make_group = make_cluster,
314 .drop_item = drop_cluster,
315};
316
317static struct configfs_item_operations cluster_ops = {
318 .release = release_cluster,
319};
320
321static struct configfs_group_operations spaces_ops = {
322 .make_group = make_space,
323 .drop_item = drop_space,
324};
325
326static struct configfs_item_operations space_ops = {
327 .release = release_space,
328};
329
330static struct configfs_group_operations comms_ops = {
331 .make_item = make_comm,
332 .drop_item = drop_comm,
333};
334
335static struct configfs_item_operations comm_ops = {
336 .release = release_comm,
337};
338
339static struct configfs_group_operations nodes_ops = {
340 .make_item = make_node,
341 .drop_item = drop_node,
342};
343
344static struct configfs_item_operations node_ops = {
345 .release = release_node,
346};
347
348static const struct config_item_type clusters_type = {
349 .ct_group_ops = &clusters_ops,
350 .ct_owner = THIS_MODULE,
351};
352
353static 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
359static const struct config_item_type spaces_type = {
360 .ct_group_ops = &spaces_ops,
361 .ct_owner = THIS_MODULE,
362};
363
364static const struct config_item_type space_type = {
365 .ct_item_ops = &space_ops,
366 .ct_owner = THIS_MODULE,
367};
368
369static const struct config_item_type comms_type = {
370 .ct_group_ops = &comms_ops,
371 .ct_owner = THIS_MODULE,
372};
373
374static 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
380static const struct config_item_type nodes_type = {
381 .ct_group_ops = &nodes_ops,
382 .ct_owner = THIS_MODULE,
383};
384
385static 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
391static 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
397static 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
402static 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
407static 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
442static 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
454static 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
463static 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
491static 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
501static 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
508static 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
535static 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
546static void release_comm(struct config_item *i)
547{
548 struct dlm_comm *cm = config_item_to_comm(i);
549 kfree(cm);
550}
551
552static 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
583static 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
596static void release_node(struct config_item *i)
597{
598 struct dlm_node *nd = config_item_to_node(i);
599 kfree(nd);
600}
601
602static 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
613int __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
620void 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
629static 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
641static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
642 size_t len)
643{
644 return len;
645}
646
647static 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
652static 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
665static 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
694static 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
739static 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
744static 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
767CONFIGFS_ATTR(comm_, nodeid);
768CONFIGFS_ATTR(comm_, local);
769CONFIGFS_ATTR(comm_, mark);
770CONFIGFS_ATTR_WO(comm_, addr);
771CONFIGFS_ATTR_RO(comm_, addr_list);
772
773static 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
782static 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
794static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
795 size_t len)
796{
797 return len;
798}
799
800static 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
805static 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
815CONFIGFS_ATTR(node_, nodeid);
816CONFIGFS_ATTR(node_, weight);
817
818static 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
828static 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
842static void put_space(struct dlm_space *sp)
843{
844 config_item_put(&sp->group.cg_item);
845}
846
847static 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
873static void put_comm(struct dlm_comm *cm)
874{
875 config_item_put(&cm->item);
876}
877
878/* caller must free mem */
879int 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
926int 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
945int dlm_our_nodeid(void)
946{
947 return local_comm->nodeid;
948}
949
950/* num 0 is first addr, num 1 is second addr */
951int 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
975struct 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