dlm: fix QUECVT when convert queue is empty
[linux-3.10.git] / fs / dlm / config.c
1 /******************************************************************************
2 *******************************************************************************
3 **
4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
5 **  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
6 **
7 **  This copyrighted material is made available to anyone wishing to use,
8 **  modify, copy, or redistribute it subject to the terms and conditions
9 **  of the GNU General Public License v.2.
10 **
11 *******************************************************************************
12 ******************************************************************************/
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/configfs.h>
17 #include <linux/slab.h>
18 #include <linux/in.h>
19 #include <linux/in6.h>
20 #include <linux/dlmconstants.h>
21 #include <net/ipv6.h>
22 #include <net/sock.h>
23
24 #include "config.h"
25 #include "lowcomms.h"
26
27 /*
28  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
29  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
30  * /config/dlm/<cluster>/comms/<comm>/nodeid
31  * /config/dlm/<cluster>/comms/<comm>/local
32  * /config/dlm/<cluster>/comms/<comm>/addr      (write only)
33  * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
34  * The <cluster> level is useless, but I haven't figured out how to avoid it.
35  */
36
37 static struct config_group *space_list;
38 static struct config_group *comm_list;
39 static struct dlm_comm *local_comm;
40 static uint32_t dlm_comm_count;
41
42 struct dlm_clusters;
43 struct dlm_cluster;
44 struct dlm_spaces;
45 struct dlm_space;
46 struct dlm_comms;
47 struct dlm_comm;
48 struct dlm_nodes;
49 struct dlm_node;
50
51 static struct config_group *make_cluster(struct config_group *, const char *);
52 static void drop_cluster(struct config_group *, struct config_item *);
53 static void release_cluster(struct config_item *);
54 static struct config_group *make_space(struct config_group *, const char *);
55 static void drop_space(struct config_group *, struct config_item *);
56 static void release_space(struct config_item *);
57 static struct config_item *make_comm(struct config_group *, const char *);
58 static void drop_comm(struct config_group *, struct config_item *);
59 static void release_comm(struct config_item *);
60 static struct config_item *make_node(struct config_group *, const char *);
61 static void drop_node(struct config_group *, struct config_item *);
62 static void release_node(struct config_item *);
63
64 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
65                             char *buf);
66 static ssize_t store_cluster(struct config_item *i,
67                              struct configfs_attribute *a,
68                              const char *buf, size_t len);
69 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
70                          char *buf);
71 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
72                           const char *buf, size_t len);
73 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
74                          char *buf);
75 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
76                           const char *buf, size_t len);
77
78 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf);
79 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
80                                 size_t len);
81 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf);
82 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
83                                 size_t len);
84 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf,
85                                 size_t len);
86 static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf);
87 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf);
88 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
89                                 size_t len);
90 static ssize_t node_weight_read(struct dlm_node *nd, char *buf);
91 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
92                                 size_t len);
93
94 struct dlm_cluster {
95         struct config_group group;
96         unsigned int cl_tcp_port;
97         unsigned int cl_buffer_size;
98         unsigned int cl_rsbtbl_size;
99         unsigned int cl_dirtbl_size;
100         unsigned int cl_recover_timer;
101         unsigned int cl_toss_secs;
102         unsigned int cl_scan_secs;
103         unsigned int cl_log_debug;
104         unsigned int cl_protocol;
105         unsigned int cl_timewarn_cs;
106         unsigned int cl_waitwarn_us;
107         unsigned int cl_new_rsb_count;
108         unsigned int cl_recover_callbacks;
109         char cl_cluster_name[DLM_LOCKSPACE_LEN];
110 };
111
112 enum {
113         CLUSTER_ATTR_TCP_PORT = 0,
114         CLUSTER_ATTR_BUFFER_SIZE,
115         CLUSTER_ATTR_RSBTBL_SIZE,
116         CLUSTER_ATTR_DIRTBL_SIZE,
117         CLUSTER_ATTR_RECOVER_TIMER,
118         CLUSTER_ATTR_TOSS_SECS,
119         CLUSTER_ATTR_SCAN_SECS,
120         CLUSTER_ATTR_LOG_DEBUG,
121         CLUSTER_ATTR_PROTOCOL,
122         CLUSTER_ATTR_TIMEWARN_CS,
123         CLUSTER_ATTR_WAITWARN_US,
124         CLUSTER_ATTR_NEW_RSB_COUNT,
125         CLUSTER_ATTR_RECOVER_CALLBACKS,
126         CLUSTER_ATTR_CLUSTER_NAME,
127 };
128
129 struct cluster_attribute {
130         struct configfs_attribute attr;
131         ssize_t (*show)(struct dlm_cluster *, char *);
132         ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
133 };
134
135 static ssize_t cluster_cluster_name_read(struct dlm_cluster *cl, char *buf)
136 {
137         return sprintf(buf, "%s\n", cl->cl_cluster_name);
138 }
139
140 static ssize_t cluster_cluster_name_write(struct dlm_cluster *cl,
141                                           const char *buf, size_t len)
142 {
143         strncpy(dlm_config.ci_cluster_name, buf, DLM_LOCKSPACE_LEN);
144         strncpy(cl->cl_cluster_name, buf, DLM_LOCKSPACE_LEN);
145         return len;
146 }
147
148 static struct cluster_attribute cluster_attr_cluster_name = {
149         .attr   = { .ca_owner = THIS_MODULE,
150                     .ca_name = "cluster_name",
151                     .ca_mode = S_IRUGO | S_IWUSR },
152         .show   = cluster_cluster_name_read,
153         .store  = cluster_cluster_name_write,
154 };
155
156 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
157                            int *info_field, int check_zero,
158                            const char *buf, size_t len)
159 {
160         unsigned int x;
161
162         if (!capable(CAP_SYS_ADMIN))
163                 return -EACCES;
164
165         x = simple_strtoul(buf, NULL, 0);
166
167         if (check_zero && !x)
168                 return -EINVAL;
169
170         *cl_field = x;
171         *info_field = x;
172
173         return len;
174 }
175
176 #define CLUSTER_ATTR(name, check_zero)                                        \
177 static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
178 {                                                                             \
179         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
180                            check_zero, buf, len);                             \
181 }                                                                             \
182 static ssize_t name##_read(struct dlm_cluster *cl, char *buf)                 \
183 {                                                                             \
184         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
185 }                                                                             \
186 static struct cluster_attribute cluster_attr_##name =                         \
187 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
188
189 CLUSTER_ATTR(tcp_port, 1);
190 CLUSTER_ATTR(buffer_size, 1);
191 CLUSTER_ATTR(rsbtbl_size, 1);
192 CLUSTER_ATTR(dirtbl_size, 1);
193 CLUSTER_ATTR(recover_timer, 1);
194 CLUSTER_ATTR(toss_secs, 1);
195 CLUSTER_ATTR(scan_secs, 1);
196 CLUSTER_ATTR(log_debug, 0);
197 CLUSTER_ATTR(protocol, 0);
198 CLUSTER_ATTR(timewarn_cs, 1);
199 CLUSTER_ATTR(waitwarn_us, 0);
200 CLUSTER_ATTR(new_rsb_count, 0);
201 CLUSTER_ATTR(recover_callbacks, 0);
202
203 static struct configfs_attribute *cluster_attrs[] = {
204         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
205         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
206         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
207         [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr,
208         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
209         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
210         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
211         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
212         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
213         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
214         [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr,
215         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count.attr,
216         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks.attr,
217         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name.attr,
218         NULL,
219 };
220
221 enum {
222         COMM_ATTR_NODEID = 0,
223         COMM_ATTR_LOCAL,
224         COMM_ATTR_ADDR,
225         COMM_ATTR_ADDR_LIST,
226 };
227
228 struct comm_attribute {
229         struct configfs_attribute attr;
230         ssize_t (*show)(struct dlm_comm *, char *);
231         ssize_t (*store)(struct dlm_comm *, const char *, size_t);
232 };
233
234 static struct comm_attribute comm_attr_nodeid = {
235         .attr   = { .ca_owner = THIS_MODULE,
236                     .ca_name = "nodeid",
237                     .ca_mode = S_IRUGO | S_IWUSR },
238         .show   = comm_nodeid_read,
239         .store  = comm_nodeid_write,
240 };
241
242 static struct comm_attribute comm_attr_local = {
243         .attr   = { .ca_owner = THIS_MODULE,
244                     .ca_name = "local",
245                     .ca_mode = S_IRUGO | S_IWUSR },
246         .show   = comm_local_read,
247         .store  = comm_local_write,
248 };
249
250 static struct comm_attribute comm_attr_addr = {
251         .attr   = { .ca_owner = THIS_MODULE,
252                     .ca_name = "addr",
253                     .ca_mode = S_IWUSR },
254         .store  = comm_addr_write,
255 };
256
257 static struct comm_attribute comm_attr_addr_list = {
258         .attr   = { .ca_owner = THIS_MODULE,
259                     .ca_name = "addr_list",
260                     .ca_mode = S_IRUGO },
261         .show   = comm_addr_list_read,
262 };
263
264 static struct configfs_attribute *comm_attrs[] = {
265         [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
266         [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
267         [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
268         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list.attr,
269         NULL,
270 };
271
272 enum {
273         NODE_ATTR_NODEID = 0,
274         NODE_ATTR_WEIGHT,
275 };
276
277 struct node_attribute {
278         struct configfs_attribute attr;
279         ssize_t (*show)(struct dlm_node *, char *);
280         ssize_t (*store)(struct dlm_node *, const char *, size_t);
281 };
282
283 static struct node_attribute node_attr_nodeid = {
284         .attr   = { .ca_owner = THIS_MODULE,
285                     .ca_name = "nodeid",
286                     .ca_mode = S_IRUGO | S_IWUSR },
287         .show   = node_nodeid_read,
288         .store  = node_nodeid_write,
289 };
290
291 static struct node_attribute node_attr_weight = {
292         .attr   = { .ca_owner = THIS_MODULE,
293                     .ca_name = "weight",
294                     .ca_mode = S_IRUGO | S_IWUSR },
295         .show   = node_weight_read,
296         .store  = node_weight_write,
297 };
298
299 static struct configfs_attribute *node_attrs[] = {
300         [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
301         [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
302         NULL,
303 };
304
305 struct dlm_clusters {
306         struct configfs_subsystem subsys;
307 };
308
309 struct dlm_spaces {
310         struct config_group ss_group;
311 };
312
313 struct dlm_space {
314         struct config_group group;
315         struct list_head members;
316         struct mutex members_lock;
317         int members_count;
318 };
319
320 struct dlm_comms {
321         struct config_group cs_group;
322 };
323
324 struct dlm_comm {
325         struct config_item item;
326         int seq;
327         int nodeid;
328         int local;
329         int addr_count;
330         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
331 };
332
333 struct dlm_nodes {
334         struct config_group ns_group;
335 };
336
337 struct dlm_node {
338         struct config_item item;
339         struct list_head list; /* space->members */
340         int nodeid;
341         int weight;
342         int new;
343         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
344 };
345
346 static struct configfs_group_operations clusters_ops = {
347         .make_group = make_cluster,
348         .drop_item = drop_cluster,
349 };
350
351 static struct configfs_item_operations cluster_ops = {
352         .release = release_cluster,
353         .show_attribute = show_cluster,
354         .store_attribute = store_cluster,
355 };
356
357 static struct configfs_group_operations spaces_ops = {
358         .make_group = make_space,
359         .drop_item = drop_space,
360 };
361
362 static struct configfs_item_operations space_ops = {
363         .release = release_space,
364 };
365
366 static struct configfs_group_operations comms_ops = {
367         .make_item = make_comm,
368         .drop_item = drop_comm,
369 };
370
371 static struct configfs_item_operations comm_ops = {
372         .release = release_comm,
373         .show_attribute = show_comm,
374         .store_attribute = store_comm,
375 };
376
377 static struct configfs_group_operations nodes_ops = {
378         .make_item = make_node,
379         .drop_item = drop_node,
380 };
381
382 static struct configfs_item_operations node_ops = {
383         .release = release_node,
384         .show_attribute = show_node,
385         .store_attribute = store_node,
386 };
387
388 static struct config_item_type clusters_type = {
389         .ct_group_ops = &clusters_ops,
390         .ct_owner = THIS_MODULE,
391 };
392
393 static struct config_item_type cluster_type = {
394         .ct_item_ops = &cluster_ops,
395         .ct_attrs = cluster_attrs,
396         .ct_owner = THIS_MODULE,
397 };
398
399 static struct config_item_type spaces_type = {
400         .ct_group_ops = &spaces_ops,
401         .ct_owner = THIS_MODULE,
402 };
403
404 static struct config_item_type space_type = {
405         .ct_item_ops = &space_ops,
406         .ct_owner = THIS_MODULE,
407 };
408
409 static struct config_item_type comms_type = {
410         .ct_group_ops = &comms_ops,
411         .ct_owner = THIS_MODULE,
412 };
413
414 static struct config_item_type comm_type = {
415         .ct_item_ops = &comm_ops,
416         .ct_attrs = comm_attrs,
417         .ct_owner = THIS_MODULE,
418 };
419
420 static struct config_item_type nodes_type = {
421         .ct_group_ops = &nodes_ops,
422         .ct_owner = THIS_MODULE,
423 };
424
425 static struct config_item_type node_type = {
426         .ct_item_ops = &node_ops,
427         .ct_attrs = node_attrs,
428         .ct_owner = THIS_MODULE,
429 };
430
431 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
432 {
433         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
434                    NULL;
435 }
436
437 static struct dlm_space *config_item_to_space(struct config_item *i)
438 {
439         return i ? container_of(to_config_group(i), struct dlm_space, group) :
440                    NULL;
441 }
442
443 static struct dlm_comm *config_item_to_comm(struct config_item *i)
444 {
445         return i ? container_of(i, struct dlm_comm, item) : NULL;
446 }
447
448 static struct dlm_node *config_item_to_node(struct config_item *i)
449 {
450         return i ? container_of(i, struct dlm_node, item) : NULL;
451 }
452
453 static struct config_group *make_cluster(struct config_group *g,
454                                          const char *name)
455 {
456         struct dlm_cluster *cl = NULL;
457         struct dlm_spaces *sps = NULL;
458         struct dlm_comms *cms = NULL;
459         void *gps = NULL;
460
461         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
462         gps = kcalloc(3, sizeof(struct config_group *), GFP_NOFS);
463         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
464         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
465
466         if (!cl || !gps || !sps || !cms)
467                 goto fail;
468
469         config_group_init_type_name(&cl->group, name, &cluster_type);
470         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
471         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
472
473         cl->group.default_groups = gps;
474         cl->group.default_groups[0] = &sps->ss_group;
475         cl->group.default_groups[1] = &cms->cs_group;
476         cl->group.default_groups[2] = NULL;
477
478         cl->cl_tcp_port = dlm_config.ci_tcp_port;
479         cl->cl_buffer_size = dlm_config.ci_buffer_size;
480         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
481         cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
482         cl->cl_recover_timer = dlm_config.ci_recover_timer;
483         cl->cl_toss_secs = dlm_config.ci_toss_secs;
484         cl->cl_scan_secs = dlm_config.ci_scan_secs;
485         cl->cl_log_debug = dlm_config.ci_log_debug;
486         cl->cl_protocol = dlm_config.ci_protocol;
487         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
488         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
489         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
490         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
491         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
492                DLM_LOCKSPACE_LEN);
493
494         space_list = &sps->ss_group;
495         comm_list = &cms->cs_group;
496         return &cl->group;
497
498  fail:
499         kfree(cl);
500         kfree(gps);
501         kfree(sps);
502         kfree(cms);
503         return ERR_PTR(-ENOMEM);
504 }
505
506 static void drop_cluster(struct config_group *g, struct config_item *i)
507 {
508         struct dlm_cluster *cl = config_item_to_cluster(i);
509         struct config_item *tmp;
510         int j;
511
512         for (j = 0; cl->group.default_groups[j]; j++) {
513                 tmp = &cl->group.default_groups[j]->cg_item;
514                 cl->group.default_groups[j] = NULL;
515                 config_item_put(tmp);
516         }
517
518         space_list = NULL;
519         comm_list = NULL;
520
521         config_item_put(i);
522 }
523
524 static void release_cluster(struct config_item *i)
525 {
526         struct dlm_cluster *cl = config_item_to_cluster(i);
527         kfree(cl->group.default_groups);
528         kfree(cl);
529 }
530
531 static struct config_group *make_space(struct config_group *g, const char *name)
532 {
533         struct dlm_space *sp = NULL;
534         struct dlm_nodes *nds = NULL;
535         void *gps = NULL;
536
537         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
538         gps = kcalloc(2, sizeof(struct config_group *), GFP_NOFS);
539         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
540
541         if (!sp || !gps || !nds)
542                 goto fail;
543
544         config_group_init_type_name(&sp->group, name, &space_type);
545         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
546
547         sp->group.default_groups = gps;
548         sp->group.default_groups[0] = &nds->ns_group;
549         sp->group.default_groups[1] = NULL;
550
551         INIT_LIST_HEAD(&sp->members);
552         mutex_init(&sp->members_lock);
553         sp->members_count = 0;
554         return &sp->group;
555
556  fail:
557         kfree(sp);
558         kfree(gps);
559         kfree(nds);
560         return ERR_PTR(-ENOMEM);
561 }
562
563 static void drop_space(struct config_group *g, struct config_item *i)
564 {
565         struct dlm_space *sp = config_item_to_space(i);
566         struct config_item *tmp;
567         int j;
568
569         /* assert list_empty(&sp->members) */
570
571         for (j = 0; sp->group.default_groups[j]; j++) {
572                 tmp = &sp->group.default_groups[j]->cg_item;
573                 sp->group.default_groups[j] = NULL;
574                 config_item_put(tmp);
575         }
576
577         config_item_put(i);
578 }
579
580 static void release_space(struct config_item *i)
581 {
582         struct dlm_space *sp = config_item_to_space(i);
583         kfree(sp->group.default_groups);
584         kfree(sp);
585 }
586
587 static struct config_item *make_comm(struct config_group *g, const char *name)
588 {
589         struct dlm_comm *cm;
590
591         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
592         if (!cm)
593                 return ERR_PTR(-ENOMEM);
594
595         config_item_init_type_name(&cm->item, name, &comm_type);
596
597         cm->seq = dlm_comm_count++;
598         if (!cm->seq)
599                 cm->seq = dlm_comm_count++;
600
601         cm->nodeid = -1;
602         cm->local = 0;
603         cm->addr_count = 0;
604         return &cm->item;
605 }
606
607 static void drop_comm(struct config_group *g, struct config_item *i)
608 {
609         struct dlm_comm *cm = config_item_to_comm(i);
610         if (local_comm == cm)
611                 local_comm = NULL;
612         dlm_lowcomms_close(cm->nodeid);
613         while (cm->addr_count--)
614                 kfree(cm->addr[cm->addr_count]);
615         config_item_put(i);
616 }
617
618 static void release_comm(struct config_item *i)
619 {
620         struct dlm_comm *cm = config_item_to_comm(i);
621         kfree(cm);
622 }
623
624 static struct config_item *make_node(struct config_group *g, const char *name)
625 {
626         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
627         struct dlm_node *nd;
628
629         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
630         if (!nd)
631                 return ERR_PTR(-ENOMEM);
632
633         config_item_init_type_name(&nd->item, name, &node_type);
634         nd->nodeid = -1;
635         nd->weight = 1;  /* default weight of 1 if none is set */
636         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
637
638         mutex_lock(&sp->members_lock);
639         list_add(&nd->list, &sp->members);
640         sp->members_count++;
641         mutex_unlock(&sp->members_lock);
642
643         return &nd->item;
644 }
645
646 static void drop_node(struct config_group *g, struct config_item *i)
647 {
648         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
649         struct dlm_node *nd = config_item_to_node(i);
650
651         mutex_lock(&sp->members_lock);
652         list_del(&nd->list);
653         sp->members_count--;
654         mutex_unlock(&sp->members_lock);
655
656         config_item_put(i);
657 }
658
659 static void release_node(struct config_item *i)
660 {
661         struct dlm_node *nd = config_item_to_node(i);
662         kfree(nd);
663 }
664
665 static struct dlm_clusters clusters_root = {
666         .subsys = {
667                 .su_group = {
668                         .cg_item = {
669                                 .ci_namebuf = "dlm",
670                                 .ci_type = &clusters_type,
671                         },
672                 },
673         },
674 };
675
676 int __init dlm_config_init(void)
677 {
678         config_group_init(&clusters_root.subsys.su_group);
679         mutex_init(&clusters_root.subsys.su_mutex);
680         return configfs_register_subsystem(&clusters_root.subsys);
681 }
682
683 void dlm_config_exit(void)
684 {
685         configfs_unregister_subsystem(&clusters_root.subsys);
686 }
687
688 /*
689  * Functions for user space to read/write attributes
690  */
691
692 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
693                             char *buf)
694 {
695         struct dlm_cluster *cl = config_item_to_cluster(i);
696         struct cluster_attribute *cla =
697                         container_of(a, struct cluster_attribute, attr);
698         return cla->show ? cla->show(cl, buf) : 0;
699 }
700
701 static ssize_t store_cluster(struct config_item *i,
702                              struct configfs_attribute *a,
703                              const char *buf, size_t len)
704 {
705         struct dlm_cluster *cl = config_item_to_cluster(i);
706         struct cluster_attribute *cla =
707                 container_of(a, struct cluster_attribute, attr);
708         return cla->store ? cla->store(cl, buf, len) : -EINVAL;
709 }
710
711 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
712                          char *buf)
713 {
714         struct dlm_comm *cm = config_item_to_comm(i);
715         struct comm_attribute *cma =
716                         container_of(a, struct comm_attribute, attr);
717         return cma->show ? cma->show(cm, buf) : 0;
718 }
719
720 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
721                           const char *buf, size_t len)
722 {
723         struct dlm_comm *cm = config_item_to_comm(i);
724         struct comm_attribute *cma =
725                 container_of(a, struct comm_attribute, attr);
726         return cma->store ? cma->store(cm, buf, len) : -EINVAL;
727 }
728
729 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf)
730 {
731         return sprintf(buf, "%d\n", cm->nodeid);
732 }
733
734 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
735                                  size_t len)
736 {
737         cm->nodeid = simple_strtol(buf, NULL, 0);
738         return len;
739 }
740
741 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
742 {
743         return sprintf(buf, "%d\n", cm->local);
744 }
745
746 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
747                                 size_t len)
748 {
749         cm->local= simple_strtol(buf, NULL, 0);
750         if (cm->local && !local_comm)
751                 local_comm = cm;
752         return len;
753 }
754
755 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
756 {
757         struct sockaddr_storage *addr;
758
759         if (len != sizeof(struct sockaddr_storage))
760                 return -EINVAL;
761
762         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
763                 return -ENOSPC;
764
765         addr = kzalloc(sizeof(*addr), GFP_NOFS);
766         if (!addr)
767                 return -ENOMEM;
768
769         memcpy(addr, buf, len);
770         cm->addr[cm->addr_count++] = addr;
771         return len;
772 }
773
774 static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf)
775 {
776         ssize_t s;
777         ssize_t allowance;
778         int i;
779         struct sockaddr_storage *addr;
780         struct sockaddr_in *addr_in;
781         struct sockaddr_in6 *addr_in6;
782         
783         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
784         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
785         
786
787         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
788         allowance = 4096;
789         buf[0] = '\0';
790
791         for (i = 0; i < cm->addr_count; i++) {
792                 addr = cm->addr[i];
793
794                 switch(addr->ss_family) {
795                 case AF_INET:
796                         addr_in = (struct sockaddr_in *)addr;
797                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
798                         break;
799                 case AF_INET6:
800                         addr_in6 = (struct sockaddr_in6 *)addr;
801                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
802                         break;
803                 default:
804                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
805                         break;
806                 }
807                 allowance -= s;
808                 if (allowance >= 0)
809                         strcat(buf, buf0);
810                 else {
811                         allowance += s;
812                         break;
813                 }
814         }
815         return 4096 - allowance;
816 }
817
818 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
819                          char *buf)
820 {
821         struct dlm_node *nd = config_item_to_node(i);
822         struct node_attribute *nda =
823                         container_of(a, struct node_attribute, attr);
824         return nda->show ? nda->show(nd, buf) : 0;
825 }
826
827 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
828                           const char *buf, size_t len)
829 {
830         struct dlm_node *nd = config_item_to_node(i);
831         struct node_attribute *nda =
832                 container_of(a, struct node_attribute, attr);
833         return nda->store ? nda->store(nd, buf, len) : -EINVAL;
834 }
835
836 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
837 {
838         return sprintf(buf, "%d\n", nd->nodeid);
839 }
840
841 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
842                                  size_t len)
843 {
844         uint32_t seq = 0;
845         nd->nodeid = simple_strtol(buf, NULL, 0);
846         dlm_comm_seq(nd->nodeid, &seq);
847         nd->comm_seq = seq;
848         return len;
849 }
850
851 static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
852 {
853         return sprintf(buf, "%d\n", nd->weight);
854 }
855
856 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
857                                  size_t len)
858 {
859         nd->weight = simple_strtol(buf, NULL, 0);
860         return len;
861 }
862
863 /*
864  * Functions for the dlm to get the info that's been configured
865  */
866
867 static struct dlm_space *get_space(char *name)
868 {
869         struct config_item *i;
870
871         if (!space_list)
872                 return NULL;
873
874         mutex_lock(&space_list->cg_subsys->su_mutex);
875         i = config_group_find_item(space_list, name);
876         mutex_unlock(&space_list->cg_subsys->su_mutex);
877
878         return config_item_to_space(i);
879 }
880
881 static void put_space(struct dlm_space *sp)
882 {
883         config_item_put(&sp->group.cg_item);
884 }
885
886 static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y)
887 {
888         switch (x->ss_family) {
889         case AF_INET: {
890                 struct sockaddr_in *sinx = (struct sockaddr_in *)x;
891                 struct sockaddr_in *siny = (struct sockaddr_in *)y;
892                 if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr)
893                         return 0;
894                 if (sinx->sin_port != siny->sin_port)
895                         return 0;
896                 break;
897         }
898         case AF_INET6: {
899                 struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x;
900                 struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y;
901                 if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr))
902                         return 0;
903                 if (sinx->sin6_port != siny->sin6_port)
904                         return 0;
905                 break;
906         }
907         default:
908                 return 0;
909         }
910         return 1;
911 }
912
913 static struct dlm_comm *get_comm(int nodeid, struct sockaddr_storage *addr)
914 {
915         struct config_item *i;
916         struct dlm_comm *cm = NULL;
917         int found = 0;
918
919         if (!comm_list)
920                 return NULL;
921
922         mutex_lock(&clusters_root.subsys.su_mutex);
923
924         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
925                 cm = config_item_to_comm(i);
926
927                 if (nodeid) {
928                         if (cm->nodeid != nodeid)
929                                 continue;
930                         found = 1;
931                         config_item_get(i);
932                         break;
933                 } else {
934                         if (!cm->addr_count || !addr_compare(cm->addr[0], addr))
935                                 continue;
936                         found = 1;
937                         config_item_get(i);
938                         break;
939                 }
940         }
941         mutex_unlock(&clusters_root.subsys.su_mutex);
942
943         if (!found)
944                 cm = NULL;
945         return cm;
946 }
947
948 static void put_comm(struct dlm_comm *cm)
949 {
950         config_item_put(&cm->item);
951 }
952
953 /* caller must free mem */
954 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
955                      int *count_out)
956 {
957         struct dlm_space *sp;
958         struct dlm_node *nd;
959         struct dlm_config_node *nodes, *node;
960         int rv, count;
961
962         sp = get_space(lsname);
963         if (!sp)
964                 return -EEXIST;
965
966         mutex_lock(&sp->members_lock);
967         if (!sp->members_count) {
968                 rv = -EINVAL;
969                 printk(KERN_ERR "dlm: zero members_count\n");
970                 goto out;
971         }
972
973         count = sp->members_count;
974
975         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
976         if (!nodes) {
977                 rv = -ENOMEM;
978                 goto out;
979         }
980
981         node = nodes;
982         list_for_each_entry(nd, &sp->members, list) {
983                 node->nodeid = nd->nodeid;
984                 node->weight = nd->weight;
985                 node->new = nd->new;
986                 node->comm_seq = nd->comm_seq;
987                 node++;
988
989                 nd->new = 0;
990         }
991
992         *count_out = count;
993         *nodes_out = nodes;
994         rv = 0;
995  out:
996         mutex_unlock(&sp->members_lock);
997         put_space(sp);
998         return rv;
999 }
1000
1001 int dlm_comm_seq(int nodeid, uint32_t *seq)
1002 {
1003         struct dlm_comm *cm = get_comm(nodeid, NULL);
1004         if (!cm)
1005                 return -EEXIST;
1006         *seq = cm->seq;
1007         put_comm(cm);
1008         return 0;
1009 }
1010
1011 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
1012 {
1013         struct dlm_comm *cm = get_comm(nodeid, NULL);
1014         if (!cm)
1015                 return -EEXIST;
1016         if (!cm->addr_count)
1017                 return -ENOENT;
1018         memcpy(addr, cm->addr[0], sizeof(*addr));
1019         put_comm(cm);
1020         return 0;
1021 }
1022
1023 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
1024 {
1025         struct dlm_comm *cm = get_comm(0, addr);
1026         if (!cm)
1027                 return -EEXIST;
1028         *nodeid = cm->nodeid;
1029         put_comm(cm);
1030         return 0;
1031 }
1032
1033 int dlm_our_nodeid(void)
1034 {
1035         return local_comm ? local_comm->nodeid : 0;
1036 }
1037
1038 /* num 0 is first addr, num 1 is second addr */
1039 int dlm_our_addr(struct sockaddr_storage *addr, int num)
1040 {
1041         if (!local_comm)
1042                 return -1;
1043         if (num + 1 > local_comm->addr_count)
1044                 return -1;
1045         memcpy(addr, local_comm->addr[num], sizeof(*addr));
1046         return 0;
1047 }
1048
1049 /* Config file defaults */
1050 #define DEFAULT_TCP_PORT       21064
1051 #define DEFAULT_BUFFER_SIZE     4096
1052 #define DEFAULT_RSBTBL_SIZE     1024
1053 #define DEFAULT_DIRTBL_SIZE     1024
1054 #define DEFAULT_RECOVER_TIMER      5
1055 #define DEFAULT_TOSS_SECS         10
1056 #define DEFAULT_SCAN_SECS          5
1057 #define DEFAULT_LOG_DEBUG          0
1058 #define DEFAULT_PROTOCOL           0
1059 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
1060 #define DEFAULT_WAITWARN_US        0
1061 #define DEFAULT_NEW_RSB_COUNT    128
1062 #define DEFAULT_RECOVER_CALLBACKS  0
1063 #define DEFAULT_CLUSTER_NAME      ""
1064
1065 struct dlm_config_info dlm_config = {
1066         .ci_tcp_port = DEFAULT_TCP_PORT,
1067         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
1068         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
1069         .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
1070         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
1071         .ci_toss_secs = DEFAULT_TOSS_SECS,
1072         .ci_scan_secs = DEFAULT_SCAN_SECS,
1073         .ci_log_debug = DEFAULT_LOG_DEBUG,
1074         .ci_protocol = DEFAULT_PROTOCOL,
1075         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
1076         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
1077         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
1078         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
1079         .ci_cluster_name = DEFAULT_CLUSTER_NAME
1080 };
1081