Merge branch 'linus' into xen-64bit
[linux-2.6] / fs / dlm / config.c
1 /******************************************************************************
2 *******************************************************************************
3 **
4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
5 **  Copyright (C) 2004-2007 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 <net/sock.h>
18
19 #include "config.h"
20 #include "lowcomms.h"
21
22 /*
23  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
24  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
25  * /config/dlm/<cluster>/comms/<comm>/nodeid
26  * /config/dlm/<cluster>/comms/<comm>/local
27  * /config/dlm/<cluster>/comms/<comm>/addr
28  * The <cluster> level is useless, but I haven't figured out how to avoid it.
29  */
30
31 static struct config_group *space_list;
32 static struct config_group *comm_list;
33 static struct comm *local_comm;
34
35 struct clusters;
36 struct cluster;
37 struct spaces;
38 struct space;
39 struct comms;
40 struct comm;
41 struct nodes;
42 struct node;
43
44 static int make_cluster(struct config_group *, const char *,
45                         struct config_group **);
46 static void drop_cluster(struct config_group *, struct config_item *);
47 static void release_cluster(struct config_item *);
48 static int make_space(struct config_group *, const char *,
49                       struct config_group **);
50 static void drop_space(struct config_group *, struct config_item *);
51 static void release_space(struct config_item *);
52 static int make_comm(struct config_group *, const char *,
53                      struct config_item **);
54 static void drop_comm(struct config_group *, struct config_item *);
55 static void release_comm(struct config_item *);
56 static int make_node(struct config_group *, const char *,
57                      struct config_item **);
58 static void drop_node(struct config_group *, struct config_item *);
59 static void release_node(struct config_item *);
60
61 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
62                             char *buf);
63 static ssize_t store_cluster(struct config_item *i,
64                              struct configfs_attribute *a,
65                              const char *buf, size_t len);
66 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
67                          char *buf);
68 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
69                           const char *buf, size_t len);
70 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
71                          char *buf);
72 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
73                           const char *buf, size_t len);
74
75 static ssize_t comm_nodeid_read(struct comm *cm, char *buf);
76 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len);
77 static ssize_t comm_local_read(struct comm *cm, char *buf);
78 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len);
79 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len);
80 static ssize_t node_nodeid_read(struct node *nd, char *buf);
81 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len);
82 static ssize_t node_weight_read(struct node *nd, char *buf);
83 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len);
84
85 struct cluster {
86         struct config_group group;
87         unsigned int cl_tcp_port;
88         unsigned int cl_buffer_size;
89         unsigned int cl_rsbtbl_size;
90         unsigned int cl_lkbtbl_size;
91         unsigned int cl_dirtbl_size;
92         unsigned int cl_recover_timer;
93         unsigned int cl_toss_secs;
94         unsigned int cl_scan_secs;
95         unsigned int cl_log_debug;
96         unsigned int cl_protocol;
97         unsigned int cl_timewarn_cs;
98 };
99
100 enum {
101         CLUSTER_ATTR_TCP_PORT = 0,
102         CLUSTER_ATTR_BUFFER_SIZE,
103         CLUSTER_ATTR_RSBTBL_SIZE,
104         CLUSTER_ATTR_LKBTBL_SIZE,
105         CLUSTER_ATTR_DIRTBL_SIZE,
106         CLUSTER_ATTR_RECOVER_TIMER,
107         CLUSTER_ATTR_TOSS_SECS,
108         CLUSTER_ATTR_SCAN_SECS,
109         CLUSTER_ATTR_LOG_DEBUG,
110         CLUSTER_ATTR_PROTOCOL,
111         CLUSTER_ATTR_TIMEWARN_CS,
112 };
113
114 struct cluster_attribute {
115         struct configfs_attribute attr;
116         ssize_t (*show)(struct cluster *, char *);
117         ssize_t (*store)(struct cluster *, const char *, size_t);
118 };
119
120 static ssize_t cluster_set(struct cluster *cl, unsigned int *cl_field,
121                            int *info_field, int check_zero,
122                            const char *buf, size_t len)
123 {
124         unsigned int x;
125
126         if (!capable(CAP_SYS_ADMIN))
127                 return -EACCES;
128
129         x = simple_strtoul(buf, NULL, 0);
130
131         if (check_zero && !x)
132                 return -EINVAL;
133
134         *cl_field = x;
135         *info_field = x;
136
137         return len;
138 }
139
140 #define CLUSTER_ATTR(name, check_zero)                                        \
141 static ssize_t name##_write(struct cluster *cl, const char *buf, size_t len)  \
142 {                                                                             \
143         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
144                            check_zero, buf, len);                             \
145 }                                                                             \
146 static ssize_t name##_read(struct cluster *cl, char *buf)                     \
147 {                                                                             \
148         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
149 }                                                                             \
150 static struct cluster_attribute cluster_attr_##name =                         \
151 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
152
153 CLUSTER_ATTR(tcp_port, 1);
154 CLUSTER_ATTR(buffer_size, 1);
155 CLUSTER_ATTR(rsbtbl_size, 1);
156 CLUSTER_ATTR(lkbtbl_size, 1);
157 CLUSTER_ATTR(dirtbl_size, 1);
158 CLUSTER_ATTR(recover_timer, 1);
159 CLUSTER_ATTR(toss_secs, 1);
160 CLUSTER_ATTR(scan_secs, 1);
161 CLUSTER_ATTR(log_debug, 0);
162 CLUSTER_ATTR(protocol, 0);
163 CLUSTER_ATTR(timewarn_cs, 1);
164
165 static struct configfs_attribute *cluster_attrs[] = {
166         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
167         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
168         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
169         [CLUSTER_ATTR_LKBTBL_SIZE] = &cluster_attr_lkbtbl_size.attr,
170         [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr,
171         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
172         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
173         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
174         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
175         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
176         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
177         NULL,
178 };
179
180 enum {
181         COMM_ATTR_NODEID = 0,
182         COMM_ATTR_LOCAL,
183         COMM_ATTR_ADDR,
184 };
185
186 struct comm_attribute {
187         struct configfs_attribute attr;
188         ssize_t (*show)(struct comm *, char *);
189         ssize_t (*store)(struct comm *, const char *, size_t);
190 };
191
192 static struct comm_attribute comm_attr_nodeid = {
193         .attr   = { .ca_owner = THIS_MODULE,
194                     .ca_name = "nodeid",
195                     .ca_mode = S_IRUGO | S_IWUSR },
196         .show   = comm_nodeid_read,
197         .store  = comm_nodeid_write,
198 };
199
200 static struct comm_attribute comm_attr_local = {
201         .attr   = { .ca_owner = THIS_MODULE,
202                     .ca_name = "local",
203                     .ca_mode = S_IRUGO | S_IWUSR },
204         .show   = comm_local_read,
205         .store  = comm_local_write,
206 };
207
208 static struct comm_attribute comm_attr_addr = {
209         .attr   = { .ca_owner = THIS_MODULE,
210                     .ca_name = "addr",
211                     .ca_mode = S_IRUGO | S_IWUSR },
212         .store  = comm_addr_write,
213 };
214
215 static struct configfs_attribute *comm_attrs[] = {
216         [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
217         [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
218         [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
219         NULL,
220 };
221
222 enum {
223         NODE_ATTR_NODEID = 0,
224         NODE_ATTR_WEIGHT,
225 };
226
227 struct node_attribute {
228         struct configfs_attribute attr;
229         ssize_t (*show)(struct node *, char *);
230         ssize_t (*store)(struct node *, const char *, size_t);
231 };
232
233 static struct node_attribute node_attr_nodeid = {
234         .attr   = { .ca_owner = THIS_MODULE,
235                     .ca_name = "nodeid",
236                     .ca_mode = S_IRUGO | S_IWUSR },
237         .show   = node_nodeid_read,
238         .store  = node_nodeid_write,
239 };
240
241 static struct node_attribute node_attr_weight = {
242         .attr   = { .ca_owner = THIS_MODULE,
243                     .ca_name = "weight",
244                     .ca_mode = S_IRUGO | S_IWUSR },
245         .show   = node_weight_read,
246         .store  = node_weight_write,
247 };
248
249 static struct configfs_attribute *node_attrs[] = {
250         [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
251         [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
252         NULL,
253 };
254
255 struct clusters {
256         struct configfs_subsystem subsys;
257 };
258
259 struct spaces {
260         struct config_group ss_group;
261 };
262
263 struct space {
264         struct config_group group;
265         struct list_head members;
266         struct mutex members_lock;
267         int members_count;
268 };
269
270 struct comms {
271         struct config_group cs_group;
272 };
273
274 struct comm {
275         struct config_item item;
276         int nodeid;
277         int local;
278         int addr_count;
279         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
280 };
281
282 struct nodes {
283         struct config_group ns_group;
284 };
285
286 struct node {
287         struct config_item item;
288         struct list_head list; /* space->members */
289         int nodeid;
290         int weight;
291         int new;
292 };
293
294 static struct configfs_group_operations clusters_ops = {
295         .make_group = make_cluster,
296         .drop_item = drop_cluster,
297 };
298
299 static struct configfs_item_operations cluster_ops = {
300         .release = release_cluster,
301         .show_attribute = show_cluster,
302         .store_attribute = store_cluster,
303 };
304
305 static struct configfs_group_operations spaces_ops = {
306         .make_group = make_space,
307         .drop_item = drop_space,
308 };
309
310 static struct configfs_item_operations space_ops = {
311         .release = release_space,
312 };
313
314 static struct configfs_group_operations comms_ops = {
315         .make_item = make_comm,
316         .drop_item = drop_comm,
317 };
318
319 static struct configfs_item_operations comm_ops = {
320         .release = release_comm,
321         .show_attribute = show_comm,
322         .store_attribute = store_comm,
323 };
324
325 static struct configfs_group_operations nodes_ops = {
326         .make_item = make_node,
327         .drop_item = drop_node,
328 };
329
330 static struct configfs_item_operations node_ops = {
331         .release = release_node,
332         .show_attribute = show_node,
333         .store_attribute = store_node,
334 };
335
336 static struct config_item_type clusters_type = {
337         .ct_group_ops = &clusters_ops,
338         .ct_owner = THIS_MODULE,
339 };
340
341 static struct config_item_type cluster_type = {
342         .ct_item_ops = &cluster_ops,
343         .ct_attrs = cluster_attrs,
344         .ct_owner = THIS_MODULE,
345 };
346
347 static struct config_item_type spaces_type = {
348         .ct_group_ops = &spaces_ops,
349         .ct_owner = THIS_MODULE,
350 };
351
352 static struct config_item_type space_type = {
353         .ct_item_ops = &space_ops,
354         .ct_owner = THIS_MODULE,
355 };
356
357 static struct config_item_type comms_type = {
358         .ct_group_ops = &comms_ops,
359         .ct_owner = THIS_MODULE,
360 };
361
362 static struct config_item_type comm_type = {
363         .ct_item_ops = &comm_ops,
364         .ct_attrs = comm_attrs,
365         .ct_owner = THIS_MODULE,
366 };
367
368 static struct config_item_type nodes_type = {
369         .ct_group_ops = &nodes_ops,
370         .ct_owner = THIS_MODULE,
371 };
372
373 static struct config_item_type node_type = {
374         .ct_item_ops = &node_ops,
375         .ct_attrs = node_attrs,
376         .ct_owner = THIS_MODULE,
377 };
378
379 static struct cluster *to_cluster(struct config_item *i)
380 {
381         return i ? container_of(to_config_group(i), struct cluster, group):NULL;
382 }
383
384 static struct space *to_space(struct config_item *i)
385 {
386         return i ? container_of(to_config_group(i), struct space, group) : NULL;
387 }
388
389 static struct comm *to_comm(struct config_item *i)
390 {
391         return i ? container_of(i, struct comm, item) : NULL;
392 }
393
394 static struct node *to_node(struct config_item *i)
395 {
396         return i ? container_of(i, struct node, item) : NULL;
397 }
398
399 static int make_cluster(struct config_group *g, const char *name,
400                         struct config_group **new_g)
401 {
402         struct cluster *cl = NULL;
403         struct spaces *sps = NULL;
404         struct comms *cms = NULL;
405         void *gps = NULL;
406
407         cl = kzalloc(sizeof(struct cluster), GFP_KERNEL);
408         gps = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
409         sps = kzalloc(sizeof(struct spaces), GFP_KERNEL);
410         cms = kzalloc(sizeof(struct comms), GFP_KERNEL);
411
412         if (!cl || !gps || !sps || !cms)
413                 goto fail;
414
415         config_group_init_type_name(&cl->group, name, &cluster_type);
416         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
417         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
418
419         cl->group.default_groups = gps;
420         cl->group.default_groups[0] = &sps->ss_group;
421         cl->group.default_groups[1] = &cms->cs_group;
422         cl->group.default_groups[2] = NULL;
423
424         cl->cl_tcp_port = dlm_config.ci_tcp_port;
425         cl->cl_buffer_size = dlm_config.ci_buffer_size;
426         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
427         cl->cl_lkbtbl_size = dlm_config.ci_lkbtbl_size;
428         cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
429         cl->cl_recover_timer = dlm_config.ci_recover_timer;
430         cl->cl_toss_secs = dlm_config.ci_toss_secs;
431         cl->cl_scan_secs = dlm_config.ci_scan_secs;
432         cl->cl_log_debug = dlm_config.ci_log_debug;
433         cl->cl_protocol = dlm_config.ci_protocol;
434         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
435
436         space_list = &sps->ss_group;
437         comm_list = &cms->cs_group;
438         *new_g = &cl->group;
439         return 0;
440
441  fail:
442         kfree(cl);
443         kfree(gps);
444         kfree(sps);
445         kfree(cms);
446         return -ENOMEM;
447 }
448
449 static void drop_cluster(struct config_group *g, struct config_item *i)
450 {
451         struct cluster *cl = to_cluster(i);
452         struct config_item *tmp;
453         int j;
454
455         for (j = 0; cl->group.default_groups[j]; j++) {
456                 tmp = &cl->group.default_groups[j]->cg_item;
457                 cl->group.default_groups[j] = NULL;
458                 config_item_put(tmp);
459         }
460
461         space_list = NULL;
462         comm_list = NULL;
463
464         config_item_put(i);
465 }
466
467 static void release_cluster(struct config_item *i)
468 {
469         struct cluster *cl = to_cluster(i);
470         kfree(cl->group.default_groups);
471         kfree(cl);
472 }
473
474 static int make_space(struct config_group *g, const char *name,
475                       struct config_group **new_g)
476 {
477         struct space *sp = NULL;
478         struct nodes *nds = NULL;
479         void *gps = NULL;
480
481         sp = kzalloc(sizeof(struct space), GFP_KERNEL);
482         gps = kcalloc(2, sizeof(struct config_group *), GFP_KERNEL);
483         nds = kzalloc(sizeof(struct nodes), GFP_KERNEL);
484
485         if (!sp || !gps || !nds)
486                 goto fail;
487
488         config_group_init_type_name(&sp->group, name, &space_type);
489         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
490
491         sp->group.default_groups = gps;
492         sp->group.default_groups[0] = &nds->ns_group;
493         sp->group.default_groups[1] = NULL;
494
495         INIT_LIST_HEAD(&sp->members);
496         mutex_init(&sp->members_lock);
497         sp->members_count = 0;
498         *new_g = &sp->group;
499         return 0;
500
501  fail:
502         kfree(sp);
503         kfree(gps);
504         kfree(nds);
505         return -ENOMEM;
506 }
507
508 static void drop_space(struct config_group *g, struct config_item *i)
509 {
510         struct space *sp = to_space(i);
511         struct config_item *tmp;
512         int j;
513
514         /* assert list_empty(&sp->members) */
515
516         for (j = 0; sp->group.default_groups[j]; j++) {
517                 tmp = &sp->group.default_groups[j]->cg_item;
518                 sp->group.default_groups[j] = NULL;
519                 config_item_put(tmp);
520         }
521
522         config_item_put(i);
523 }
524
525 static void release_space(struct config_item *i)
526 {
527         struct space *sp = to_space(i);
528         kfree(sp->group.default_groups);
529         kfree(sp);
530 }
531
532 static int make_comm(struct config_group *g, const char *name,
533                      struct config_item **new_i)
534 {
535         struct comm *cm;
536
537         cm = kzalloc(sizeof(struct comm), GFP_KERNEL);
538         if (!cm)
539                 return -ENOMEM;
540
541         config_item_init_type_name(&cm->item, name, &comm_type);
542         cm->nodeid = -1;
543         cm->local = 0;
544         cm->addr_count = 0;
545         *new_i = &cm->item;
546         return 0;
547 }
548
549 static void drop_comm(struct config_group *g, struct config_item *i)
550 {
551         struct comm *cm = to_comm(i);
552         if (local_comm == cm)
553                 local_comm = NULL;
554         dlm_lowcomms_close(cm->nodeid);
555         while (cm->addr_count--)
556                 kfree(cm->addr[cm->addr_count]);
557         config_item_put(i);
558 }
559
560 static void release_comm(struct config_item *i)
561 {
562         struct comm *cm = to_comm(i);
563         kfree(cm);
564 }
565
566 static int make_node(struct config_group *g, const char *name,
567                      struct config_item **new_i)
568 {
569         struct space *sp = to_space(g->cg_item.ci_parent);
570         struct node *nd;
571
572         nd = kzalloc(sizeof(struct node), GFP_KERNEL);
573         if (!nd)
574                 return -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         *new_i = &nd->item;
587         return 0;
588 }
589
590 static void drop_node(struct config_group *g, struct config_item *i)
591 {
592         struct space *sp = to_space(g->cg_item.ci_parent);
593         struct node *nd = to_node(i);
594
595         mutex_lock(&sp->members_lock);
596         list_del(&nd->list);
597         sp->members_count--;
598         mutex_unlock(&sp->members_lock);
599
600         config_item_put(i);
601 }
602
603 static void release_node(struct config_item *i)
604 {
605         struct node *nd = to_node(i);
606         kfree(nd);
607 }
608
609 static struct clusters clusters_root = {
610         .subsys = {
611                 .su_group = {
612                         .cg_item = {
613                                 .ci_namebuf = "dlm",
614                                 .ci_type = &clusters_type,
615                         },
616                 },
617         },
618 };
619
620 int __init dlm_config_init(void)
621 {
622         config_group_init(&clusters_root.subsys.su_group);
623         mutex_init(&clusters_root.subsys.su_mutex);
624         return configfs_register_subsystem(&clusters_root.subsys);
625 }
626
627 void dlm_config_exit(void)
628 {
629         configfs_unregister_subsystem(&clusters_root.subsys);
630 }
631
632 /*
633  * Functions for user space to read/write attributes
634  */
635
636 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
637                             char *buf)
638 {
639         struct cluster *cl = to_cluster(i);
640         struct cluster_attribute *cla =
641                         container_of(a, struct cluster_attribute, attr);
642         return cla->show ? cla->show(cl, buf) : 0;
643 }
644
645 static ssize_t store_cluster(struct config_item *i,
646                              struct configfs_attribute *a,
647                              const char *buf, size_t len)
648 {
649         struct cluster *cl = to_cluster(i);
650         struct cluster_attribute *cla =
651                 container_of(a, struct cluster_attribute, attr);
652         return cla->store ? cla->store(cl, buf, len) : -EINVAL;
653 }
654
655 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
656                          char *buf)
657 {
658         struct comm *cm = to_comm(i);
659         struct comm_attribute *cma =
660                         container_of(a, struct comm_attribute, attr);
661         return cma->show ? cma->show(cm, buf) : 0;
662 }
663
664 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
665                           const char *buf, size_t len)
666 {
667         struct comm *cm = to_comm(i);
668         struct comm_attribute *cma =
669                 container_of(a, struct comm_attribute, attr);
670         return cma->store ? cma->store(cm, buf, len) : -EINVAL;
671 }
672
673 static ssize_t comm_nodeid_read(struct comm *cm, char *buf)
674 {
675         return sprintf(buf, "%d\n", cm->nodeid);
676 }
677
678 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, 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 comm *cm, char *buf)
685 {
686         return sprintf(buf, "%d\n", cm->local);
687 }
688
689 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len)
690 {
691         cm->local= simple_strtol(buf, NULL, 0);
692         if (cm->local && !local_comm)
693                 local_comm = cm;
694         return len;
695 }
696
697 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len)
698 {
699         struct sockaddr_storage *addr;
700
701         if (len != sizeof(struct sockaddr_storage))
702                 return -EINVAL;
703
704         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
705                 return -ENOSPC;
706
707         addr = kzalloc(sizeof(*addr), GFP_KERNEL);
708         if (!addr)
709                 return -ENOMEM;
710
711         memcpy(addr, buf, len);
712         cm->addr[cm->addr_count++] = addr;
713         return len;
714 }
715
716 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
717                          char *buf)
718 {
719         struct node *nd = to_node(i);
720         struct node_attribute *nda =
721                         container_of(a, struct node_attribute, attr);
722         return nda->show ? nda->show(nd, buf) : 0;
723 }
724
725 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
726                           const char *buf, size_t len)
727 {
728         struct node *nd = to_node(i);
729         struct node_attribute *nda =
730                 container_of(a, struct node_attribute, attr);
731         return nda->store ? nda->store(nd, buf, len) : -EINVAL;
732 }
733
734 static ssize_t node_nodeid_read(struct node *nd, char *buf)
735 {
736         return sprintf(buf, "%d\n", nd->nodeid);
737 }
738
739 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len)
740 {
741         nd->nodeid = simple_strtol(buf, NULL, 0);
742         return len;
743 }
744
745 static ssize_t node_weight_read(struct node *nd, char *buf)
746 {
747         return sprintf(buf, "%d\n", nd->weight);
748 }
749
750 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len)
751 {
752         nd->weight = simple_strtol(buf, NULL, 0);
753         return len;
754 }
755
756 /*
757  * Functions for the dlm to get the info that's been configured
758  */
759
760 static struct space *get_space(char *name)
761 {
762         struct config_item *i;
763
764         if (!space_list)
765                 return NULL;
766
767         mutex_lock(&space_list->cg_subsys->su_mutex);
768         i = config_group_find_item(space_list, name);
769         mutex_unlock(&space_list->cg_subsys->su_mutex);
770
771         return to_space(i);
772 }
773
774 static void put_space(struct space *sp)
775 {
776         config_item_put(&sp->group.cg_item);
777 }
778
779 static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr)
780 {
781         struct config_item *i;
782         struct comm *cm = NULL;
783         int found = 0;
784
785         if (!comm_list)
786                 return NULL;
787
788         mutex_lock(&clusters_root.subsys.su_mutex);
789
790         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
791                 cm = to_comm(i);
792
793                 if (nodeid) {
794                         if (cm->nodeid != nodeid)
795                                 continue;
796                         found = 1;
797                         config_item_get(i);
798                         break;
799                 } else {
800                         if (!cm->addr_count ||
801                             memcmp(cm->addr[0], addr, sizeof(*addr)))
802                                 continue;
803                         found = 1;
804                         config_item_get(i);
805                         break;
806                 }
807         }
808         mutex_unlock(&clusters_root.subsys.su_mutex);
809
810         if (!found)
811                 cm = NULL;
812         return cm;
813 }
814
815 static void put_comm(struct comm *cm)
816 {
817         config_item_put(&cm->item);
818 }
819
820 /* caller must free mem */
821 int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out,
822                     int **new_out, int *new_count_out)
823 {
824         struct space *sp;
825         struct node *nd;
826         int i = 0, rv = 0, ids_count = 0, new_count = 0;
827         int *ids, *new;
828
829         sp = get_space(lsname);
830         if (!sp)
831                 return -EEXIST;
832
833         mutex_lock(&sp->members_lock);
834         if (!sp->members_count) {
835                 rv = -EINVAL;
836                 printk(KERN_ERR "dlm: zero members_count\n");
837                 goto out;
838         }
839
840         ids_count = sp->members_count;
841
842         ids = kcalloc(ids_count, sizeof(int), GFP_KERNEL);
843         if (!ids) {
844                 rv = -ENOMEM;
845                 goto out;
846         }
847
848         list_for_each_entry(nd, &sp->members, list) {
849                 ids[i++] = nd->nodeid;
850                 if (nd->new)
851                         new_count++;
852         }
853
854         if (ids_count != i)
855                 printk(KERN_ERR "dlm: bad nodeid count %d %d\n", ids_count, i);
856
857         if (!new_count)
858                 goto out_ids;
859
860         new = kcalloc(new_count, sizeof(int), GFP_KERNEL);
861         if (!new) {
862                 kfree(ids);
863                 rv = -ENOMEM;
864                 goto out;
865         }
866
867         i = 0;
868         list_for_each_entry(nd, &sp->members, list) {
869                 if (nd->new) {
870                         new[i++] = nd->nodeid;
871                         nd->new = 0;
872                 }
873         }
874         *new_count_out = new_count;
875         *new_out = new;
876
877  out_ids:
878         *ids_count_out = ids_count;
879         *ids_out = ids;
880  out:
881         mutex_unlock(&sp->members_lock);
882         put_space(sp);
883         return rv;
884 }
885
886 int dlm_node_weight(char *lsname, int nodeid)
887 {
888         struct space *sp;
889         struct node *nd;
890         int w = -EEXIST;
891
892         sp = get_space(lsname);
893         if (!sp)
894                 goto out;
895
896         mutex_lock(&sp->members_lock);
897         list_for_each_entry(nd, &sp->members, list) {
898                 if (nd->nodeid != nodeid)
899                         continue;
900                 w = nd->weight;
901                 break;
902         }
903         mutex_unlock(&sp->members_lock);
904         put_space(sp);
905  out:
906         return w;
907 }
908
909 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
910 {
911         struct comm *cm = get_comm(nodeid, NULL);
912         if (!cm)
913                 return -EEXIST;
914         if (!cm->addr_count)
915                 return -ENOENT;
916         memcpy(addr, cm->addr[0], sizeof(*addr));
917         put_comm(cm);
918         return 0;
919 }
920
921 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
922 {
923         struct comm *cm = get_comm(0, addr);
924         if (!cm)
925                 return -EEXIST;
926         *nodeid = cm->nodeid;
927         put_comm(cm);
928         return 0;
929 }
930
931 int dlm_our_nodeid(void)
932 {
933         return local_comm ? local_comm->nodeid : 0;
934 }
935
936 /* num 0 is first addr, num 1 is second addr */
937 int dlm_our_addr(struct sockaddr_storage *addr, int num)
938 {
939         if (!local_comm)
940                 return -1;
941         if (num + 1 > local_comm->addr_count)
942                 return -1;
943         memcpy(addr, local_comm->addr[num], sizeof(*addr));
944         return 0;
945 }
946
947 /* Config file defaults */
948 #define DEFAULT_TCP_PORT       21064
949 #define DEFAULT_BUFFER_SIZE     4096
950 #define DEFAULT_RSBTBL_SIZE      256
951 #define DEFAULT_LKBTBL_SIZE     1024
952 #define DEFAULT_DIRTBL_SIZE      512
953 #define DEFAULT_RECOVER_TIMER      5
954 #define DEFAULT_TOSS_SECS         10
955 #define DEFAULT_SCAN_SECS          5
956 #define DEFAULT_LOG_DEBUG          0
957 #define DEFAULT_PROTOCOL           0
958 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
959
960 struct dlm_config_info dlm_config = {
961         .ci_tcp_port = DEFAULT_TCP_PORT,
962         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
963         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
964         .ci_lkbtbl_size = DEFAULT_LKBTBL_SIZE,
965         .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
966         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
967         .ci_toss_secs = DEFAULT_TOSS_SECS,
968         .ci_scan_secs = DEFAULT_SCAN_SECS,
969         .ci_log_debug = DEFAULT_LOG_DEBUG,
970         .ci_protocol = DEFAULT_PROTOCOL,
971         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS
972 };
973