dlm: remove bkl
[linux-2.6.git] / fs / dlm / config.c
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/in.h>
18 #include <linux/in6.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
31  * The <cluster> level is useless, but I haven't figured out how to avoid it.
32  */
33
34 static struct config_group *space_list;
35 static struct config_group *comm_list;
36 static struct dlm_comm *local_comm;
37
38 struct dlm_clusters;
39 struct dlm_cluster;
40 struct dlm_spaces;
41 struct dlm_space;
42 struct dlm_comms;
43 struct dlm_comm;
44 struct dlm_nodes;
45 struct dlm_node;
46
47 static struct config_group *make_cluster(struct config_group *, const char *);
48 static void drop_cluster(struct config_group *, struct config_item *);
49 static void release_cluster(struct config_item *);
50 static struct config_group *make_space(struct config_group *, const char *);
51 static void drop_space(struct config_group *, struct config_item *);
52 static void release_space(struct config_item *);
53 static struct config_item *make_comm(struct config_group *, const char *);
54 static void drop_comm(struct config_group *, struct config_item *);
55 static void release_comm(struct config_item *);
56 static struct config_item *make_node(struct config_group *, const char *);
57 static void drop_node(struct config_group *, struct config_item *);
58 static void release_node(struct config_item *);
59
60 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
61                             char *buf);
62 static ssize_t store_cluster(struct config_item *i,
63                              struct configfs_attribute *a,
64                              const char *buf, size_t len);
65 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
66                          char *buf);
67 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
68                           const char *buf, size_t len);
69 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
70                          char *buf);
71 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
72                           const char *buf, size_t len);
73
74 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf);
75 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
76                                 size_t len);
77 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf);
78 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
79                                 size_t len);
80 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf,
81                                 size_t len);
82 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf);
83 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
84                                 size_t len);
85 static ssize_t node_weight_read(struct dlm_node *nd, char *buf);
86 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
87                                 size_t len);
88
89 struct dlm_cluster {
90         struct config_group group;
91         unsigned int cl_tcp_port;
92         unsigned int cl_buffer_size;
93         unsigned int cl_rsbtbl_size;
94         unsigned int cl_lkbtbl_size;
95         unsigned int cl_dirtbl_size;
96         unsigned int cl_recover_timer;
97         unsigned int cl_toss_secs;
98         unsigned int cl_scan_secs;
99         unsigned int cl_log_debug;
100         unsigned int cl_protocol;
101         unsigned int cl_timewarn_cs;
102 };
103
104 enum {
105         CLUSTER_ATTR_TCP_PORT = 0,
106         CLUSTER_ATTR_BUFFER_SIZE,
107         CLUSTER_ATTR_RSBTBL_SIZE,
108         CLUSTER_ATTR_LKBTBL_SIZE,
109         CLUSTER_ATTR_DIRTBL_SIZE,
110         CLUSTER_ATTR_RECOVER_TIMER,
111         CLUSTER_ATTR_TOSS_SECS,
112         CLUSTER_ATTR_SCAN_SECS,
113         CLUSTER_ATTR_LOG_DEBUG,
114         CLUSTER_ATTR_PROTOCOL,
115         CLUSTER_ATTR_TIMEWARN_CS,
116 };
117
118 struct cluster_attribute {
119         struct configfs_attribute attr;
120         ssize_t (*show)(struct dlm_cluster *, char *);
121         ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
122 };
123
124 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
125                            int *info_field, int check_zero,
126                            const char *buf, size_t len)
127 {
128         unsigned int x;
129
130         if (!capable(CAP_SYS_ADMIN))
131                 return -EACCES;
132
133         x = simple_strtoul(buf, NULL, 0);
134
135         if (check_zero && !x)
136                 return -EINVAL;
137
138         *cl_field = x;
139         *info_field = x;
140
141         return len;
142 }
143
144 #define CLUSTER_ATTR(name, check_zero)                                        \
145 static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
146 {                                                                             \
147         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
148                            check_zero, buf, len);                             \
149 }                                                                             \
150 static ssize_t name##_read(struct dlm_cluster *cl, char *buf)                 \
151 {                                                                             \
152         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
153 }                                                                             \
154 static struct cluster_attribute cluster_attr_##name =                         \
155 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
156
157 CLUSTER_ATTR(tcp_port, 1);
158 CLUSTER_ATTR(buffer_size, 1);
159 CLUSTER_ATTR(rsbtbl_size, 1);
160 CLUSTER_ATTR(lkbtbl_size, 1);
161 CLUSTER_ATTR(dirtbl_size, 1);
162 CLUSTER_ATTR(recover_timer, 1);
163 CLUSTER_ATTR(toss_secs, 1);
164 CLUSTER_ATTR(scan_secs, 1);
165 CLUSTER_ATTR(log_debug, 0);
166 CLUSTER_ATTR(protocol, 0);
167 CLUSTER_ATTR(timewarn_cs, 1);
168
169 static struct configfs_attribute *cluster_attrs[] = {
170         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
171         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
172         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
173         [CLUSTER_ATTR_LKBTBL_SIZE] = &cluster_attr_lkbtbl_size.attr,
174         [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr,
175         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
176         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
177         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
178         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
179         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
180         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
181         NULL,
182 };
183
184 enum {
185         COMM_ATTR_NODEID = 0,
186         COMM_ATTR_LOCAL,
187         COMM_ATTR_ADDR,
188 };
189
190 struct comm_attribute {
191         struct configfs_attribute attr;
192         ssize_t (*show)(struct dlm_comm *, char *);
193         ssize_t (*store)(struct dlm_comm *, const char *, size_t);
194 };
195
196 static struct comm_attribute comm_attr_nodeid = {
197         .attr   = { .ca_owner = THIS_MODULE,
198                     .ca_name = "nodeid",
199                     .ca_mode = S_IRUGO | S_IWUSR },
200         .show   = comm_nodeid_read,
201         .store  = comm_nodeid_write,
202 };
203
204 static struct comm_attribute comm_attr_local = {
205         .attr   = { .ca_owner = THIS_MODULE,
206                     .ca_name = "local",
207                     .ca_mode = S_IRUGO | S_IWUSR },
208         .show   = comm_local_read,
209         .store  = comm_local_write,
210 };
211
212 static struct comm_attribute comm_attr_addr = {
213         .attr   = { .ca_owner = THIS_MODULE,
214                     .ca_name = "addr",
215                     .ca_mode = S_IRUGO | S_IWUSR },
216         .store  = comm_addr_write,
217 };
218
219 static struct configfs_attribute *comm_attrs[] = {
220         [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
221         [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
222         [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
223         NULL,
224 };
225
226 enum {
227         NODE_ATTR_NODEID = 0,
228         NODE_ATTR_WEIGHT,
229 };
230
231 struct node_attribute {
232         struct configfs_attribute attr;
233         ssize_t (*show)(struct dlm_node *, char *);
234         ssize_t (*store)(struct dlm_node *, const char *, size_t);
235 };
236
237 static struct node_attribute node_attr_nodeid = {
238         .attr   = { .ca_owner = THIS_MODULE,
239                     .ca_name = "nodeid",
240                     .ca_mode = S_IRUGO | S_IWUSR },
241         .show   = node_nodeid_read,
242         .store  = node_nodeid_write,
243 };
244
245 static struct node_attribute node_attr_weight = {
246         .attr   = { .ca_owner = THIS_MODULE,
247                     .ca_name = "weight",
248                     .ca_mode = S_IRUGO | S_IWUSR },
249         .show   = node_weight_read,
250         .store  = node_weight_write,
251 };
252
253 static struct configfs_attribute *node_attrs[] = {
254         [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
255         [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
256         NULL,
257 };
258
259 struct dlm_clusters {
260         struct configfs_subsystem subsys;
261 };
262
263 struct dlm_spaces {
264         struct config_group ss_group;
265 };
266
267 struct dlm_space {
268         struct config_group group;
269         struct list_head members;
270         struct mutex members_lock;
271         int members_count;
272 };
273
274 struct dlm_comms {
275         struct config_group cs_group;
276 };
277
278 struct dlm_comm {
279         struct config_item item;
280         int nodeid;
281         int local;
282         int addr_count;
283         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
284 };
285
286 struct dlm_nodes {
287         struct config_group ns_group;
288 };
289
290 struct dlm_node {
291         struct config_item item;
292         struct list_head list; /* space->members */
293         int nodeid;
294         int weight;
295         int new;
296 };
297
298 static struct configfs_group_operations clusters_ops = {
299         .make_group = make_cluster,
300         .drop_item = drop_cluster,
301 };
302
303 static struct configfs_item_operations cluster_ops = {
304         .release = release_cluster,
305         .show_attribute = show_cluster,
306         .store_attribute = store_cluster,
307 };
308
309 static struct configfs_group_operations spaces_ops = {
310         .make_group = make_space,
311         .drop_item = drop_space,
312 };
313
314 static struct configfs_item_operations space_ops = {
315         .release = release_space,
316 };
317
318 static struct configfs_group_operations comms_ops = {
319         .make_item = make_comm,
320         .drop_item = drop_comm,
321 };
322
323 static struct configfs_item_operations comm_ops = {
324         .release = release_comm,
325         .show_attribute = show_comm,
326         .store_attribute = store_comm,
327 };
328
329 static struct configfs_group_operations nodes_ops = {
330         .make_item = make_node,
331         .drop_item = drop_node,
332 };
333
334 static struct configfs_item_operations node_ops = {
335         .release = release_node,
336         .show_attribute = show_node,
337         .store_attribute = store_node,
338 };
339
340 static struct config_item_type clusters_type = {
341         .ct_group_ops = &clusters_ops,
342         .ct_owner = THIS_MODULE,
343 };
344
345 static struct config_item_type cluster_type = {
346         .ct_item_ops = &cluster_ops,
347         .ct_attrs = cluster_attrs,
348         .ct_owner = THIS_MODULE,
349 };
350
351 static struct config_item_type spaces_type = {
352         .ct_group_ops = &spaces_ops,
353         .ct_owner = THIS_MODULE,
354 };
355
356 static struct config_item_type space_type = {
357         .ct_item_ops = &space_ops,
358         .ct_owner = THIS_MODULE,
359 };
360
361 static struct config_item_type comms_type = {
362         .ct_group_ops = &comms_ops,
363         .ct_owner = THIS_MODULE,
364 };
365
366 static struct config_item_type comm_type = {
367         .ct_item_ops = &comm_ops,
368         .ct_attrs = comm_attrs,
369         .ct_owner = THIS_MODULE,
370 };
371
372 static struct config_item_type nodes_type = {
373         .ct_group_ops = &nodes_ops,
374         .ct_owner = THIS_MODULE,
375 };
376
377 static struct config_item_type node_type = {
378         .ct_item_ops = &node_ops,
379         .ct_attrs = node_attrs,
380         .ct_owner = THIS_MODULE,
381 };
382
383 static struct dlm_cluster *to_cluster(struct config_item *i)
384 {
385         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
386                    NULL;
387 }
388
389 static struct dlm_space *to_space(struct config_item *i)
390 {
391         return i ? container_of(to_config_group(i), struct dlm_space, group) :
392                    NULL;
393 }
394
395 static struct dlm_comm *to_comm(struct config_item *i)
396 {
397         return i ? container_of(i, struct dlm_comm, item) : NULL;
398 }
399
400 static struct dlm_node *to_node(struct config_item *i)
401 {
402         return i ? container_of(i, struct dlm_node, item) : NULL;
403 }
404
405 static struct config_group *make_cluster(struct config_group *g,
406                                          const char *name)
407 {
408         struct dlm_cluster *cl = NULL;
409         struct dlm_spaces *sps = NULL;
410         struct dlm_comms *cms = NULL;
411         void *gps = NULL;
412
413         cl = kzalloc(sizeof(struct dlm_cluster), GFP_KERNEL);
414         gps = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
415         sps = kzalloc(sizeof(struct dlm_spaces), GFP_KERNEL);
416         cms = kzalloc(sizeof(struct dlm_comms), GFP_KERNEL);
417
418         if (!cl || !gps || !sps || !cms)
419                 goto fail;
420
421         config_group_init_type_name(&cl->group, name, &cluster_type);
422         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
423         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
424
425         cl->group.default_groups = gps;
426         cl->group.default_groups[0] = &sps->ss_group;
427         cl->group.default_groups[1] = &cms->cs_group;
428         cl->group.default_groups[2] = NULL;
429
430         cl->cl_tcp_port = dlm_config.ci_tcp_port;
431         cl->cl_buffer_size = dlm_config.ci_buffer_size;
432         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
433         cl->cl_lkbtbl_size = dlm_config.ci_lkbtbl_size;
434         cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
435         cl->cl_recover_timer = dlm_config.ci_recover_timer;
436         cl->cl_toss_secs = dlm_config.ci_toss_secs;
437         cl->cl_scan_secs = dlm_config.ci_scan_secs;
438         cl->cl_log_debug = dlm_config.ci_log_debug;
439         cl->cl_protocol = dlm_config.ci_protocol;
440         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
441
442         space_list = &sps->ss_group;
443         comm_list = &cms->cs_group;
444         return &cl->group;
445
446  fail:
447         kfree(cl);
448         kfree(gps);
449         kfree(sps);
450         kfree(cms);
451         return ERR_PTR(-ENOMEM);
452 }
453
454 static void drop_cluster(struct config_group *g, struct config_item *i)
455 {
456         struct dlm_cluster *cl = to_cluster(i);
457         struct config_item *tmp;
458         int j;
459
460         for (j = 0; cl->group.default_groups[j]; j++) {
461                 tmp = &cl->group.default_groups[j]->cg_item;
462                 cl->group.default_groups[j] = NULL;
463                 config_item_put(tmp);
464         }
465
466         space_list = NULL;
467         comm_list = NULL;
468
469         config_item_put(i);
470 }
471
472 static void release_cluster(struct config_item *i)
473 {
474         struct dlm_cluster *cl = to_cluster(i);
475         kfree(cl->group.default_groups);
476         kfree(cl);
477 }
478
479 static struct config_group *make_space(struct config_group *g, const char *name)
480 {
481         struct dlm_space *sp = NULL;
482         struct dlm_nodes *nds = NULL;
483         void *gps = NULL;
484
485         sp = kzalloc(sizeof(struct dlm_space), GFP_KERNEL);
486         gps = kcalloc(2, sizeof(struct config_group *), GFP_KERNEL);
487         nds = kzalloc(sizeof(struct dlm_nodes), GFP_KERNEL);
488
489         if (!sp || !gps || !nds)
490                 goto fail;
491
492         config_group_init_type_name(&sp->group, name, &space_type);
493         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
494
495         sp->group.default_groups = gps;
496         sp->group.default_groups[0] = &nds->ns_group;
497         sp->group.default_groups[1] = NULL;
498
499         INIT_LIST_HEAD(&sp->members);
500         mutex_init(&sp->members_lock);
501         sp->members_count = 0;
502         return &sp->group;
503
504  fail:
505         kfree(sp);
506         kfree(gps);
507         kfree(nds);
508         return ERR_PTR(-ENOMEM);
509 }
510
511 static void drop_space(struct config_group *g, struct config_item *i)
512 {
513         struct dlm_space *sp = to_space(i);
514         struct config_item *tmp;
515         int j;
516
517         /* assert list_empty(&sp->members) */
518
519         for (j = 0; sp->group.default_groups[j]; j++) {
520                 tmp = &sp->group.default_groups[j]->cg_item;
521                 sp->group.default_groups[j] = NULL;
522                 config_item_put(tmp);
523         }
524
525         config_item_put(i);
526 }
527
528 static void release_space(struct config_item *i)
529 {
530         struct dlm_space *sp = to_space(i);
531         kfree(sp->group.default_groups);
532         kfree(sp);
533 }
534
535 static struct config_item *make_comm(struct config_group *g, const char *name)
536 {
537         struct dlm_comm *cm;
538
539         cm = kzalloc(sizeof(struct dlm_comm), GFP_KERNEL);
540         if (!cm)
541                 return ERR_PTR(-ENOMEM);
542
543         config_item_init_type_name(&cm->item, name, &comm_type);
544         cm->nodeid = -1;
545         cm->local = 0;
546         cm->addr_count = 0;
547         return &cm->item;
548 }
549
550 static void drop_comm(struct config_group *g, struct config_item *i)
551 {
552         struct dlm_comm *cm = to_comm(i);
553         if (local_comm == cm)
554                 local_comm = NULL;
555         dlm_lowcomms_close(cm->nodeid);
556         while (cm->addr_count--)
557                 kfree(cm->addr[cm->addr_count]);
558         config_item_put(i);
559 }
560
561 static void release_comm(struct config_item *i)
562 {
563         struct dlm_comm *cm = to_comm(i);
564         kfree(cm);
565 }
566
567 static struct config_item *make_node(struct config_group *g, const char *name)
568 {
569         struct dlm_space *sp = to_space(g->cg_item.ci_parent);
570         struct dlm_node *nd;
571
572         nd = kzalloc(sizeof(struct dlm_node), GFP_KERNEL);
573         if (!nd)
574                 return ERR_PTR(-ENOMEM);
575
576         config_item_init_type_name(&nd->item, name, &node_type);
577         nd->nodeid = -1;
578         nd->weight = 1;  /* default weight of 1 if none is set */
579         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
580
581         mutex_lock(&sp->members_lock);
582         list_add(&nd->list, &sp->members);
583         sp->members_count++;
584         mutex_unlock(&sp->members_lock);
585
586         return &nd->item;
587 }
588
589 static void drop_node(struct config_group *g, struct config_item *i)
590 {
591         struct dlm_space *sp = to_space(g->cg_item.ci_parent);
592         struct dlm_node *nd = to_node(i);
593
594         mutex_lock(&sp->members_lock);
595         list_del(&nd->list);
596         sp->members_count--;
597         mutex_unlock(&sp->members_lock);
598
599         config_item_put(i);
600 }
601
602 static void release_node(struct config_item *i)
603 {
604         struct dlm_node *nd = to_node(i);
605         kfree(nd);
606 }
607
608 static struct dlm_clusters clusters_root = {
609         .subsys = {
610                 .su_group = {
611                         .cg_item = {
612                                 .ci_namebuf = "dlm",
613                                 .ci_type = &clusters_type,
614                         },
615                 },
616         },
617 };
618
619 int __init dlm_config_init(void)
620 {
621         config_group_init(&clusters_root.subsys.su_group);
622         mutex_init(&clusters_root.subsys.su_mutex);
623         return configfs_register_subsystem(&clusters_root.subsys);
624 }
625
626 void dlm_config_exit(void)
627 {
628         configfs_unregister_subsystem(&clusters_root.subsys);
629 }
630
631 /*
632  * Functions for user space to read/write attributes
633  */
634
635 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
636                             char *buf)
637 {
638         struct dlm_cluster *cl = to_cluster(i);
639         struct cluster_attribute *cla =
640                         container_of(a, struct cluster_attribute, attr);
641         return cla->show ? cla->show(cl, buf) : 0;
642 }
643
644 static ssize_t store_cluster(struct config_item *i,
645                              struct configfs_attribute *a,
646                              const char *buf, size_t len)
647 {
648         struct dlm_cluster *cl = to_cluster(i);
649         struct cluster_attribute *cla =
650                 container_of(a, struct cluster_attribute, attr);
651         return cla->store ? cla->store(cl, buf, len) : -EINVAL;
652 }
653
654 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
655                          char *buf)
656 {
657         struct dlm_comm *cm = to_comm(i);
658         struct comm_attribute *cma =
659                         container_of(a, struct comm_attribute, attr);
660         return cma->show ? cma->show(cm, buf) : 0;
661 }
662
663 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
664                           const char *buf, size_t len)
665 {
666         struct dlm_comm *cm = to_comm(i);
667         struct comm_attribute *cma =
668                 container_of(a, struct comm_attribute, attr);
669         return cma->store ? cma->store(cm, buf, len) : -EINVAL;
670 }
671
672 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf)
673 {
674         return sprintf(buf, "%d\n", cm->nodeid);
675 }
676
677 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
678                                  size_t len)
679 {
680         cm->nodeid = simple_strtol(buf, NULL, 0);
681         return len;
682 }
683
684 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
685 {
686         return sprintf(buf, "%d\n", cm->local);
687 }
688
689 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
690                                 size_t len)
691 {
692         cm->local= simple_strtol(buf, NULL, 0);
693         if (cm->local && !local_comm)
694                 local_comm = cm;
695         return len;
696 }
697
698 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
699 {
700         struct sockaddr_storage *addr;
701
702         if (len != sizeof(struct sockaddr_storage))
703                 return -EINVAL;
704
705         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
706                 return -ENOSPC;
707
708         addr = kzalloc(sizeof(*addr), GFP_KERNEL);
709         if (!addr)
710                 return -ENOMEM;
711
712         memcpy(addr, buf, len);
713         cm->addr[cm->addr_count++] = addr;
714         return len;
715 }
716
717 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
718                          char *buf)
719 {
720         struct dlm_node *nd = to_node(i);
721         struct node_attribute *nda =
722                         container_of(a, struct node_attribute, attr);
723         return nda->show ? nda->show(nd, buf) : 0;
724 }
725
726 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
727                           const char *buf, size_t len)
728 {
729         struct dlm_node *nd = to_node(i);
730         struct node_attribute *nda =
731                 container_of(a, struct node_attribute, attr);
732         return nda->store ? nda->store(nd, buf, len) : -EINVAL;
733 }
734
735 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
736 {
737         return sprintf(buf, "%d\n", nd->nodeid);
738 }
739
740 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
741                                  size_t len)
742 {
743         nd->nodeid = simple_strtol(buf, NULL, 0);
744         return len;
745 }
746
747 static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
748 {
749         return sprintf(buf, "%d\n", nd->weight);
750 }
751
752 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
753                                  size_t len)
754 {
755         nd->weight = simple_strtol(buf, NULL, 0);
756         return len;
757 }
758
759 /*
760  * Functions for the dlm to get the info that's been configured
761  */
762
763 static struct dlm_space *get_space(char *name)
764 {
765         struct config_item *i;
766
767         if (!space_list)
768                 return NULL;
769
770         mutex_lock(&space_list->cg_subsys->su_mutex);
771         i = config_group_find_item(space_list, name);
772         mutex_unlock(&space_list->cg_subsys->su_mutex);
773
774         return to_space(i);
775 }
776
777 static void put_space(struct dlm_space *sp)
778 {
779         config_item_put(&sp->group.cg_item);
780 }
781
782 static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y)
783 {
784         switch (x->ss_family) {
785         case AF_INET: {
786                 struct sockaddr_in *sinx = (struct sockaddr_in *)x;
787                 struct sockaddr_in *siny = (struct sockaddr_in *)y;
788                 if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr)
789                         return 0;
790                 if (sinx->sin_port != siny->sin_port)
791                         return 0;
792                 break;
793         }
794         case AF_INET6: {
795                 struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x;
796                 struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y;
797                 if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr))
798                         return 0;
799                 if (sinx->sin6_port != siny->sin6_port)
800                         return 0;
801                 break;
802         }
803         default:
804                 return 0;
805         }
806         return 1;
807 }
808
809 static struct dlm_comm *get_comm(int nodeid, struct sockaddr_storage *addr)
810 {
811         struct config_item *i;
812         struct dlm_comm *cm = NULL;
813         int found = 0;
814
815         if (!comm_list)
816                 return NULL;
817
818         mutex_lock(&clusters_root.subsys.su_mutex);
819
820         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
821                 cm = to_comm(i);
822
823                 if (nodeid) {
824                         if (cm->nodeid != nodeid)
825                                 continue;
826                         found = 1;
827                         config_item_get(i);
828                         break;
829                 } else {
830                         if (!cm->addr_count || !addr_compare(cm->addr[0], addr))
831                                 continue;
832                         found = 1;
833                         config_item_get(i);
834                         break;
835                 }
836         }
837         mutex_unlock(&clusters_root.subsys.su_mutex);
838
839         if (!found)
840                 cm = NULL;
841         return cm;
842 }
843
844 static void put_comm(struct dlm_comm *cm)
845 {
846         config_item_put(&cm->item);
847 }
848
849 /* caller must free mem */
850 int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out,
851                     int **new_out, int *new_count_out)
852 {
853         struct dlm_space *sp;
854         struct dlm_node *nd;
855         int i = 0, rv = 0, ids_count = 0, new_count = 0;
856         int *ids, *new;
857
858         sp = get_space(lsname);
859         if (!sp)
860                 return -EEXIST;
861
862         mutex_lock(&sp->members_lock);
863         if (!sp->members_count) {
864                 rv = -EINVAL;
865                 printk(KERN_ERR "dlm: zero members_count\n");
866                 goto out;
867         }
868
869         ids_count = sp->members_count;
870
871         ids = kcalloc(ids_count, sizeof(int), GFP_KERNEL);
872         if (!ids) {
873                 rv = -ENOMEM;
874                 goto out;
875         }
876
877         list_for_each_entry(nd, &sp->members, list) {
878                 ids[i++] = nd->nodeid;
879                 if (nd->new)
880                         new_count++;
881         }
882
883         if (ids_count != i)
884                 printk(KERN_ERR "dlm: bad nodeid count %d %d\n", ids_count, i);
885
886         if (!new_count)
887                 goto out_ids;
888
889         new = kcalloc(new_count, sizeof(int), GFP_KERNEL);
890         if (!new) {
891                 kfree(ids);
892                 rv = -ENOMEM;
893                 goto out;
894         }
895
896         i = 0;
897         list_for_each_entry(nd, &sp->members, list) {
898                 if (nd->new) {
899                         new[i++] = nd->nodeid;
900                         nd->new = 0;
901                 }
902         }
903         *new_count_out = new_count;
904         *new_out = new;
905
906  out_ids:
907         *ids_count_out = ids_count;
908         *ids_out = ids;
909  out:
910         mutex_unlock(&sp->members_lock);
911         put_space(sp);
912         return rv;
913 }
914
915 int dlm_node_weight(char *lsname, int nodeid)
916 {
917         struct dlm_space *sp;
918         struct dlm_node *nd;
919         int w = -EEXIST;
920
921         sp = get_space(lsname);
922         if (!sp)
923                 goto out;
924
925         mutex_lock(&sp->members_lock);
926         list_for_each_entry(nd, &sp->members, list) {
927                 if (nd->nodeid != nodeid)
928                         continue;
929                 w = nd->weight;
930                 break;
931         }
932         mutex_unlock(&sp->members_lock);
933         put_space(sp);
934  out:
935         return w;
936 }
937
938 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
939 {
940         struct dlm_comm *cm = get_comm(nodeid, NULL);
941         if (!cm)
942                 return -EEXIST;
943         if (!cm->addr_count)
944                 return -ENOENT;
945         memcpy(addr, cm->addr[0], sizeof(*addr));
946         put_comm(cm);
947         return 0;
948 }
949
950 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
951 {
952         struct dlm_comm *cm = get_comm(0, addr);
953         if (!cm)
954                 return -EEXIST;
955         *nodeid = cm->nodeid;
956         put_comm(cm);
957         return 0;
958 }
959
960 int dlm_our_nodeid(void)
961 {
962         return local_comm ? local_comm->nodeid : 0;
963 }
964
965 /* num 0 is first addr, num 1 is second addr */
966 int dlm_our_addr(struct sockaddr_storage *addr, int num)
967 {
968         if (!local_comm)
969                 return -1;
970         if (num + 1 > local_comm->addr_count)
971                 return -1;
972         memcpy(addr, local_comm->addr[num], sizeof(*addr));
973         return 0;
974 }
975
976 /* Config file defaults */
977 #define DEFAULT_TCP_PORT       21064
978 #define DEFAULT_BUFFER_SIZE     4096
979 #define DEFAULT_RSBTBL_SIZE      256
980 #define DEFAULT_LKBTBL_SIZE     1024
981 #define DEFAULT_DIRTBL_SIZE      512
982 #define DEFAULT_RECOVER_TIMER      5
983 #define DEFAULT_TOSS_SECS         10
984 #define DEFAULT_SCAN_SECS          5
985 #define DEFAULT_LOG_DEBUG          0
986 #define DEFAULT_PROTOCOL           0
987 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
988
989 struct dlm_config_info dlm_config = {
990         .ci_tcp_port = DEFAULT_TCP_PORT,
991         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
992         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
993         .ci_lkbtbl_size = DEFAULT_LKBTBL_SIZE,
994         .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
995         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
996         .ci_toss_secs = DEFAULT_TOSS_SECS,
997         .ci_scan_secs = DEFAULT_SCAN_SECS,
998         .ci_log_debug = DEFAULT_LOG_DEBUG,
999         .ci_protocol = DEFAULT_PROTOCOL,
1000         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS
1001 };
1002