5a3d390cc8269335b5b9d19c5fa0efaec2d8d7b0
[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) 2004-2007 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 struct config_group *make_cluster(struct config_group *, const char *);
45 static void drop_cluster(struct config_group *, struct config_item *);
46 static void release_cluster(struct config_item *);
47 static struct config_group *make_space(struct config_group *, const char *);
48 static void drop_space(struct config_group *, struct config_item *);
49 static void release_space(struct config_item *);
50 static struct config_item *make_comm(struct config_group *, const char *);
51 static void drop_comm(struct config_group *, struct config_item *);
52 static void release_comm(struct config_item *);
53 static struct config_item *make_node(struct config_group *, const char *);
54 static void drop_node(struct config_group *, struct config_item *);
55 static void release_node(struct config_item *);
56
57 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
58                             char *buf);
59 static ssize_t store_cluster(struct config_item *i,
60                              struct configfs_attribute *a,
61                              const char *buf, size_t len);
62 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
63                          char *buf);
64 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
65                           const char *buf, size_t len);
66 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
67                          char *buf);
68 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
69                           const char *buf, size_t len);
70
71 static ssize_t comm_nodeid_read(struct comm *cm, char *buf);
72 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len);
73 static ssize_t comm_local_read(struct comm *cm, char *buf);
74 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len);
75 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len);
76 static ssize_t node_nodeid_read(struct node *nd, char *buf);
77 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len);
78 static ssize_t node_weight_read(struct node *nd, char *buf);
79 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len);
80
81 struct cluster {
82         struct config_group group;
83         unsigned int cl_tcp_port;
84         unsigned int cl_buffer_size;
85         unsigned int cl_rsbtbl_size;
86         unsigned int cl_lkbtbl_size;
87         unsigned int cl_dirtbl_size;
88         unsigned int cl_recover_timer;
89         unsigned int cl_toss_secs;
90         unsigned int cl_scan_secs;
91         unsigned int cl_log_debug;
92         unsigned int cl_protocol;
93 };
94
95 enum {
96         CLUSTER_ATTR_TCP_PORT = 0,
97         CLUSTER_ATTR_BUFFER_SIZE,
98         CLUSTER_ATTR_RSBTBL_SIZE,
99         CLUSTER_ATTR_LKBTBL_SIZE,
100         CLUSTER_ATTR_DIRTBL_SIZE,
101         CLUSTER_ATTR_RECOVER_TIMER,
102         CLUSTER_ATTR_TOSS_SECS,
103         CLUSTER_ATTR_SCAN_SECS,
104         CLUSTER_ATTR_LOG_DEBUG,
105         CLUSTER_ATTR_PROTOCOL,
106 };
107
108 struct cluster_attribute {
109         struct configfs_attribute attr;
110         ssize_t (*show)(struct cluster *, char *);
111         ssize_t (*store)(struct cluster *, const char *, size_t);
112 };
113
114 static ssize_t cluster_set(struct cluster *cl, unsigned int *cl_field,
115                            unsigned int *info_field, int check_zero,
116                            const char *buf, size_t len)
117 {
118         unsigned int x;
119
120         if (!capable(CAP_SYS_ADMIN))
121                 return -EACCES;
122
123         x = simple_strtoul(buf, NULL, 0);
124
125         if (check_zero && !x)
126                 return -EINVAL;
127
128         *cl_field = x;
129         *info_field = x;
130
131         return len;
132 }
133
134 #define __CONFIGFS_ATTR(_name,_mode,_read,_write) {                           \
135         .attr   = { .ca_name = __stringify(_name),                            \
136                     .ca_mode = _mode,                                         \
137                     .ca_owner = THIS_MODULE },                                \
138         .show   = _read,                                                      \
139         .store  = _write,                                                     \
140 }
141
142 #define CLUSTER_ATTR(name, check_zero)                                        \
143 static ssize_t name##_write(struct cluster *cl, const char *buf, size_t len)  \
144 {                                                                             \
145         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
146                            check_zero, buf, len);                             \
147 }                                                                             \
148 static ssize_t name##_read(struct cluster *cl, char *buf)                     \
149 {                                                                             \
150         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
151 }                                                                             \
152 static struct cluster_attribute cluster_attr_##name =                         \
153 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
154
155 CLUSTER_ATTR(tcp_port, 1);
156 CLUSTER_ATTR(buffer_size, 1);
157 CLUSTER_ATTR(rsbtbl_size, 1);
158 CLUSTER_ATTR(lkbtbl_size, 1);
159 CLUSTER_ATTR(dirtbl_size, 1);
160 CLUSTER_ATTR(recover_timer, 1);
161 CLUSTER_ATTR(toss_secs, 1);
162 CLUSTER_ATTR(scan_secs, 1);
163 CLUSTER_ATTR(log_debug, 0);
164 CLUSTER_ATTR(protocol, 0);
165
166 static struct configfs_attribute *cluster_attrs[] = {
167         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
168         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
169         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
170         [CLUSTER_ATTR_LKBTBL_SIZE] = &cluster_attr_lkbtbl_size.attr,
171         [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr,
172         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
173         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
174         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
175         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
176         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.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 };
292
293 static struct configfs_group_operations clusters_ops = {
294         .make_group = make_cluster,
295         .drop_item = drop_cluster,
296 };
297
298 static struct configfs_item_operations cluster_ops = {
299         .release = release_cluster,
300         .show_attribute = show_cluster,
301         .store_attribute = store_cluster,
302 };
303
304 static struct configfs_group_operations spaces_ops = {
305         .make_group = make_space,
306         .drop_item = drop_space,
307 };
308
309 static struct configfs_item_operations space_ops = {
310         .release = release_space,
311 };
312
313 static struct configfs_group_operations comms_ops = {
314         .make_item = make_comm,
315         .drop_item = drop_comm,
316 };
317
318 static struct configfs_item_operations comm_ops = {
319         .release = release_comm,
320         .show_attribute = show_comm,
321         .store_attribute = store_comm,
322 };
323
324 static struct configfs_group_operations nodes_ops = {
325         .make_item = make_node,
326         .drop_item = drop_node,
327 };
328
329 static struct configfs_item_operations node_ops = {
330         .release = release_node,
331         .show_attribute = show_node,
332         .store_attribute = store_node,
333 };
334
335 static struct config_item_type clusters_type = {
336         .ct_group_ops = &clusters_ops,
337         .ct_owner = THIS_MODULE,
338 };
339
340 static struct config_item_type cluster_type = {
341         .ct_item_ops = &cluster_ops,
342         .ct_attrs = cluster_attrs,
343         .ct_owner = THIS_MODULE,
344 };
345
346 static struct config_item_type spaces_type = {
347         .ct_group_ops = &spaces_ops,
348         .ct_owner = THIS_MODULE,
349 };
350
351 static struct config_item_type space_type = {
352         .ct_item_ops = &space_ops,
353         .ct_owner = THIS_MODULE,
354 };
355
356 static struct config_item_type comms_type = {
357         .ct_group_ops = &comms_ops,
358         .ct_owner = THIS_MODULE,
359 };
360
361 static struct config_item_type comm_type = {
362         .ct_item_ops = &comm_ops,
363         .ct_attrs = comm_attrs,
364         .ct_owner = THIS_MODULE,
365 };
366
367 static struct config_item_type nodes_type = {
368         .ct_group_ops = &nodes_ops,
369         .ct_owner = THIS_MODULE,
370 };
371
372 static struct config_item_type node_type = {
373         .ct_item_ops = &node_ops,
374         .ct_attrs = node_attrs,
375         .ct_owner = THIS_MODULE,
376 };
377
378 static struct cluster *to_cluster(struct config_item *i)
379 {
380         return i ? container_of(to_config_group(i), struct cluster, group):NULL;
381 }
382
383 static struct space *to_space(struct config_item *i)
384 {
385         return i ? container_of(to_config_group(i), struct space, group) : NULL;
386 }
387
388 static struct comm *to_comm(struct config_item *i)
389 {
390         return i ? container_of(i, struct comm, item) : NULL;
391 }
392
393 static struct node *to_node(struct config_item *i)
394 {
395         return i ? container_of(i, struct node, item) : NULL;
396 }
397
398 static struct config_group *make_cluster(struct config_group *g,
399                                          const char *name)
400 {
401         struct cluster *cl = NULL;
402         struct spaces *sps = NULL;
403         struct comms *cms = NULL;
404         void *gps = NULL;
405
406         cl = kzalloc(sizeof(struct cluster), GFP_KERNEL);
407         gps = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
408         sps = kzalloc(sizeof(struct spaces), GFP_KERNEL);
409         cms = kzalloc(sizeof(struct comms), GFP_KERNEL);
410
411         if (!cl || !gps || !sps || !cms)
412                 goto fail;
413
414         config_group_init_type_name(&cl->group, name, &cluster_type);
415         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
416         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
417
418         cl->group.default_groups = gps;
419         cl->group.default_groups[0] = &sps->ss_group;
420         cl->group.default_groups[1] = &cms->cs_group;
421         cl->group.default_groups[2] = NULL;
422
423         cl->cl_tcp_port = dlm_config.ci_tcp_port;
424         cl->cl_buffer_size = dlm_config.ci_buffer_size;
425         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
426         cl->cl_lkbtbl_size = dlm_config.ci_lkbtbl_size;
427         cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
428         cl->cl_recover_timer = dlm_config.ci_recover_timer;
429         cl->cl_toss_secs = dlm_config.ci_toss_secs;
430         cl->cl_scan_secs = dlm_config.ci_scan_secs;
431         cl->cl_log_debug = dlm_config.ci_log_debug;
432
433         space_list = &sps->ss_group;
434         comm_list = &cms->cs_group;
435         return &cl->group;
436
437  fail:
438         kfree(cl);
439         kfree(gps);
440         kfree(sps);
441         kfree(cms);
442         return NULL;
443 }
444
445 static void drop_cluster(struct config_group *g, struct config_item *i)
446 {
447         struct cluster *cl = to_cluster(i);
448         struct config_item *tmp;
449         int j;
450
451         for (j = 0; cl->group.default_groups[j]; j++) {
452                 tmp = &cl->group.default_groups[j]->cg_item;
453                 cl->group.default_groups[j] = NULL;
454                 config_item_put(tmp);
455         }
456
457         space_list = NULL;
458         comm_list = NULL;
459
460         config_item_put(i);
461 }
462
463 static void release_cluster(struct config_item *i)
464 {
465         struct cluster *cl = to_cluster(i);
466         kfree(cl->group.default_groups);
467         kfree(cl);
468 }
469
470 static struct config_group *make_space(struct config_group *g, const char *name)
471 {
472         struct space *sp = NULL;
473         struct nodes *nds = NULL;
474         void *gps = NULL;
475
476         sp = kzalloc(sizeof(struct space), GFP_KERNEL);
477         gps = kcalloc(2, sizeof(struct config_group *), GFP_KERNEL);
478         nds = kzalloc(sizeof(struct nodes), GFP_KERNEL);
479
480         if (!sp || !gps || !nds)
481                 goto fail;
482
483         config_group_init_type_name(&sp->group, name, &space_type);
484         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
485
486         sp->group.default_groups = gps;
487         sp->group.default_groups[0] = &nds->ns_group;
488         sp->group.default_groups[1] = NULL;
489
490         INIT_LIST_HEAD(&sp->members);
491         mutex_init(&sp->members_lock);
492         sp->members_count = 0;
493         return &sp->group;
494
495  fail:
496         kfree(sp);
497         kfree(gps);
498         kfree(nds);
499         return NULL;
500 }
501
502 static void drop_space(struct config_group *g, struct config_item *i)
503 {
504         struct space *sp = to_space(i);
505         struct config_item *tmp;
506         int j;
507
508         /* assert list_empty(&sp->members) */
509
510         for (j = 0; sp->group.default_groups[j]; j++) {
511                 tmp = &sp->group.default_groups[j]->cg_item;
512                 sp->group.default_groups[j] = NULL;
513                 config_item_put(tmp);
514         }
515
516         config_item_put(i);
517 }
518
519 static void release_space(struct config_item *i)
520 {
521         struct space *sp = to_space(i);
522         kfree(sp->group.default_groups);
523         kfree(sp);
524 }
525
526 static struct config_item *make_comm(struct config_group *g, const char *name)
527 {
528         struct comm *cm;
529
530         cm = kzalloc(sizeof(struct comm), GFP_KERNEL);
531         if (!cm)
532                 return NULL;
533
534         config_item_init_type_name(&cm->item, name, &comm_type);
535         cm->nodeid = -1;
536         cm->local = 0;
537         cm->addr_count = 0;
538         return &cm->item;
539 }
540
541 static void drop_comm(struct config_group *g, struct config_item *i)
542 {
543         struct comm *cm = to_comm(i);
544         if (local_comm == cm)
545                 local_comm = NULL;
546         dlm_lowcomms_close(cm->nodeid);
547         while (cm->addr_count--)
548                 kfree(cm->addr[cm->addr_count]);
549         config_item_put(i);
550 }
551
552 static void release_comm(struct config_item *i)
553 {
554         struct comm *cm = to_comm(i);
555         kfree(cm);
556 }
557
558 static struct config_item *make_node(struct config_group *g, const char *name)
559 {
560         struct space *sp = to_space(g->cg_item.ci_parent);
561         struct node *nd;
562
563         nd = kzalloc(sizeof(struct node), GFP_KERNEL);
564         if (!nd)
565                 return NULL;
566
567         config_item_init_type_name(&nd->item, name, &node_type);
568         nd->nodeid = -1;
569         nd->weight = 1;  /* default weight of 1 if none is set */
570
571         mutex_lock(&sp->members_lock);
572         list_add(&nd->list, &sp->members);
573         sp->members_count++;
574         mutex_unlock(&sp->members_lock);
575
576         return &nd->item;
577 }
578
579 static void drop_node(struct config_group *g, struct config_item *i)
580 {
581         struct space *sp = to_space(g->cg_item.ci_parent);
582         struct node *nd = to_node(i);
583
584         mutex_lock(&sp->members_lock);
585         list_del(&nd->list);
586         sp->members_count--;
587         mutex_unlock(&sp->members_lock);
588
589         config_item_put(i);
590 }
591
592 static void release_node(struct config_item *i)
593 {
594         struct node *nd = to_node(i);
595         kfree(nd);
596 }
597
598 static struct clusters clusters_root = {
599         .subsys = {
600                 .su_group = {
601                         .cg_item = {
602                                 .ci_namebuf = "dlm",
603                                 .ci_type = &clusters_type,
604                         },
605                 },
606         },
607 };
608
609 int dlm_config_init(void)
610 {
611         config_group_init(&clusters_root.subsys.su_group);
612         init_MUTEX(&clusters_root.subsys.su_sem);
613         return configfs_register_subsystem(&clusters_root.subsys);
614 }
615
616 void dlm_config_exit(void)
617 {
618         configfs_unregister_subsystem(&clusters_root.subsys);
619 }
620
621 /*
622  * Functions for user space to read/write attributes
623  */
624
625 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
626                             char *buf)
627 {
628         struct cluster *cl = to_cluster(i);
629         struct cluster_attribute *cla =
630                         container_of(a, struct cluster_attribute, attr);
631         return cla->show ? cla->show(cl, buf) : 0;
632 }
633
634 static ssize_t store_cluster(struct config_item *i,
635                              struct configfs_attribute *a,
636                              const char *buf, size_t len)
637 {
638         struct cluster *cl = to_cluster(i);
639         struct cluster_attribute *cla =
640                 container_of(a, struct cluster_attribute, attr);
641         return cla->store ? cla->store(cl, buf, len) : -EINVAL;
642 }
643
644 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
645                          char *buf)
646 {
647         struct comm *cm = to_comm(i);
648         struct comm_attribute *cma =
649                         container_of(a, struct comm_attribute, attr);
650         return cma->show ? cma->show(cm, buf) : 0;
651 }
652
653 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
654                           const char *buf, size_t len)
655 {
656         struct comm *cm = to_comm(i);
657         struct comm_attribute *cma =
658                 container_of(a, struct comm_attribute, attr);
659         return cma->store ? cma->store(cm, buf, len) : -EINVAL;
660 }
661
662 static ssize_t comm_nodeid_read(struct comm *cm, char *buf)
663 {
664         return sprintf(buf, "%d\n", cm->nodeid);
665 }
666
667 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len)
668 {
669         cm->nodeid = simple_strtol(buf, NULL, 0);
670         return len;
671 }
672
673 static ssize_t comm_local_read(struct comm *cm, char *buf)
674 {
675         return sprintf(buf, "%d\n", cm->local);
676 }
677
678 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len)
679 {
680         cm->local= simple_strtol(buf, NULL, 0);
681         if (cm->local && !local_comm)
682                 local_comm = cm;
683         return len;
684 }
685
686 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len)
687 {
688         struct sockaddr_storage *addr;
689
690         if (len != sizeof(struct sockaddr_storage))
691                 return -EINVAL;
692
693         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
694                 return -ENOSPC;
695
696         addr = kzalloc(sizeof(*addr), GFP_KERNEL);
697         if (!addr)
698                 return -ENOMEM;
699
700         memcpy(addr, buf, len);
701         cm->addr[cm->addr_count++] = addr;
702         return len;
703 }
704
705 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
706                          char *buf)
707 {
708         struct node *nd = to_node(i);
709         struct node_attribute *nda =
710                         container_of(a, struct node_attribute, attr);
711         return nda->show ? nda->show(nd, buf) : 0;
712 }
713
714 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
715                           const char *buf, size_t len)
716 {
717         struct node *nd = to_node(i);
718         struct node_attribute *nda =
719                 container_of(a, struct node_attribute, attr);
720         return nda->store ? nda->store(nd, buf, len) : -EINVAL;
721 }
722
723 static ssize_t node_nodeid_read(struct node *nd, char *buf)
724 {
725         return sprintf(buf, "%d\n", nd->nodeid);
726 }
727
728 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len)
729 {
730         nd->nodeid = simple_strtol(buf, NULL, 0);
731         return len;
732 }
733
734 static ssize_t node_weight_read(struct node *nd, char *buf)
735 {
736         return sprintf(buf, "%d\n", nd->weight);
737 }
738
739 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len)
740 {
741         nd->weight = simple_strtol(buf, NULL, 0);
742         return len;
743 }
744
745 /*
746  * Functions for the dlm to get the info that's been configured
747  */
748
749 static struct space *get_space(char *name)
750 {
751         struct config_item *i;
752
753         if (!space_list)
754                 return NULL;
755
756         down(&space_list->cg_subsys->su_sem);
757         i = config_group_find_obj(space_list, name);
758         up(&space_list->cg_subsys->su_sem);
759
760         return to_space(i);
761 }
762
763 static void put_space(struct space *sp)
764 {
765         config_item_put(&sp->group.cg_item);
766 }
767
768 static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr)
769 {
770         struct config_item *i;
771         struct comm *cm = NULL;
772         int found = 0;
773
774         if (!comm_list)
775                 return NULL;
776
777         down(&clusters_root.subsys.su_sem);
778
779         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
780                 cm = to_comm(i);
781
782                 if (nodeid) {
783                         if (cm->nodeid != nodeid)
784                                 continue;
785                         found = 1;
786                         config_item_get(i);
787                         break;
788                 } else {
789                         if (!cm->addr_count ||
790                             memcmp(cm->addr[0], addr, sizeof(*addr)))
791                                 continue;
792                         found = 1;
793                         config_item_get(i);
794                         break;
795                 }
796         }
797         up(&clusters_root.subsys.su_sem);
798
799         if (!found)
800                 cm = NULL;
801         return cm;
802 }
803
804 static void put_comm(struct comm *cm)
805 {
806         config_item_put(&cm->item);
807 }
808
809 /* caller must free mem */
810 int dlm_nodeid_list(char *lsname, int **ids_out)
811 {
812         struct space *sp;
813         struct node *nd;
814         int i = 0, rv = 0;
815         int *ids;
816
817         sp = get_space(lsname);
818         if (!sp)
819                 return -EEXIST;
820
821         mutex_lock(&sp->members_lock);
822         if (!sp->members_count) {
823                 rv = 0;
824                 goto out;
825         }
826
827         ids = kcalloc(sp->members_count, sizeof(int), GFP_KERNEL);
828         if (!ids) {
829                 rv = -ENOMEM;
830                 goto out;
831         }
832
833         rv = sp->members_count;
834         list_for_each_entry(nd, &sp->members, list)
835                 ids[i++] = nd->nodeid;
836
837         if (rv != i)
838                 printk("bad nodeid count %d %d\n", rv, i);
839
840         *ids_out = ids;
841  out:
842         mutex_unlock(&sp->members_lock);
843         put_space(sp);
844         return rv;
845 }
846
847 int dlm_node_weight(char *lsname, int nodeid)
848 {
849         struct space *sp;
850         struct node *nd;
851         int w = -EEXIST;
852
853         sp = get_space(lsname);
854         if (!sp)
855                 goto out;
856
857         mutex_lock(&sp->members_lock);
858         list_for_each_entry(nd, &sp->members, list) {
859                 if (nd->nodeid != nodeid)
860                         continue;
861                 w = nd->weight;
862                 break;
863         }
864         mutex_unlock(&sp->members_lock);
865         put_space(sp);
866  out:
867         return w;
868 }
869
870 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
871 {
872         struct comm *cm = get_comm(nodeid, NULL);
873         if (!cm)
874                 return -EEXIST;
875         if (!cm->addr_count)
876                 return -ENOENT;
877         memcpy(addr, cm->addr[0], sizeof(*addr));
878         put_comm(cm);
879         return 0;
880 }
881
882 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
883 {
884         struct comm *cm = get_comm(0, addr);
885         if (!cm)
886                 return -EEXIST;
887         *nodeid = cm->nodeid;
888         put_comm(cm);
889         return 0;
890 }
891
892 int dlm_our_nodeid(void)
893 {
894         return local_comm ? local_comm->nodeid : 0;
895 }
896
897 /* num 0 is first addr, num 1 is second addr */
898 int dlm_our_addr(struct sockaddr_storage *addr, int num)
899 {
900         if (!local_comm)
901                 return -1;
902         if (num + 1 > local_comm->addr_count)
903                 return -1;
904         memcpy(addr, local_comm->addr[num], sizeof(*addr));
905         return 0;
906 }
907
908 /* Config file defaults */
909 #define DEFAULT_TCP_PORT       21064
910 #define DEFAULT_BUFFER_SIZE     4096
911 #define DEFAULT_RSBTBL_SIZE      256
912 #define DEFAULT_LKBTBL_SIZE     1024
913 #define DEFAULT_DIRTBL_SIZE      512
914 #define DEFAULT_RECOVER_TIMER      5
915 #define DEFAULT_TOSS_SECS         10
916 #define DEFAULT_SCAN_SECS          5
917 #define DEFAULT_LOG_DEBUG          0
918 #define DEFAULT_PROTOCOL           0
919
920 struct dlm_config_info dlm_config = {
921         .ci_tcp_port = DEFAULT_TCP_PORT,
922         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
923         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
924         .ci_lkbtbl_size = DEFAULT_LKBTBL_SIZE,
925         .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
926         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
927         .ci_toss_secs = DEFAULT_TOSS_SECS,
928         .ci_scan_secs = DEFAULT_SCAN_SECS,
929         .ci_log_debug = DEFAULT_LOG_DEBUG,
930         .ci_protocol = DEFAULT_PROTOCOL
931 };
932