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TOMOYO Linux Cross Reference
Linux/fs/dlm/config.c

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  1 /******************************************************************************
  2 *******************************************************************************
  3 **
  4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
  5 **  Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
  6 **
  7 **  This copyrighted material is made available to anyone wishing to use,
  8 **  modify, copy, or redistribute it subject to the terms and conditions
  9 **  of the GNU General Public License v.2.
 10 **
 11 *******************************************************************************
 12 ******************************************************************************/
 13 
 14 #include <linux/kernel.h>
 15 #include <linux/module.h>
 16 #include <linux/configfs.h>
 17 #include <linux/slab.h>
 18 #include <linux/in.h>
 19 #include <linux/in6.h>
 20 #include <net/ipv6.h>
 21 #include <net/sock.h>
 22 
 23 #include "config.h"
 24 #include "lowcomms.h"
 25 
 26 /*
 27  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
 28  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
 29  * /config/dlm/<cluster>/comms/<comm>/nodeid
 30  * /config/dlm/<cluster>/comms/<comm>/local
 31  * /config/dlm/<cluster>/comms/<comm>/addr      (write only)
 32  * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
 33  * The <cluster> level is useless, but I haven't figured out how to avoid it.
 34  */
 35 
 36 static struct config_group *space_list;
 37 static struct config_group *comm_list;
 38 static struct dlm_comm *local_comm;
 39 
 40 struct dlm_clusters;
 41 struct dlm_cluster;
 42 struct dlm_spaces;
 43 struct dlm_space;
 44 struct dlm_comms;
 45 struct dlm_comm;
 46 struct dlm_nodes;
 47 struct dlm_node;
 48 
 49 static struct config_group *make_cluster(struct config_group *, const char *);
 50 static void drop_cluster(struct config_group *, struct config_item *);
 51 static void release_cluster(struct config_item *);
 52 static struct config_group *make_space(struct config_group *, const char *);
 53 static void drop_space(struct config_group *, struct config_item *);
 54 static void release_space(struct config_item *);
 55 static struct config_item *make_comm(struct config_group *, const char *);
 56 static void drop_comm(struct config_group *, struct config_item *);
 57 static void release_comm(struct config_item *);
 58 static struct config_item *make_node(struct config_group *, const char *);
 59 static void drop_node(struct config_group *, struct config_item *);
 60 static void release_node(struct config_item *);
 61 
 62 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
 63                             char *buf);
 64 static ssize_t store_cluster(struct config_item *i,
 65                              struct configfs_attribute *a,
 66                              const char *buf, size_t len);
 67 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
 68                          char *buf);
 69 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
 70                           const char *buf, size_t len);
 71 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
 72                          char *buf);
 73 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
 74                           const char *buf, size_t len);
 75 
 76 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf);
 77 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
 78                                 size_t len);
 79 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf);
 80 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
 81                                 size_t len);
 82 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf,
 83                                 size_t len);
 84 static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf);
 85 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf);
 86 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
 87                                 size_t len);
 88 static ssize_t node_weight_read(struct dlm_node *nd, char *buf);
 89 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
 90                                 size_t len);
 91 
 92 struct dlm_cluster {
 93         struct config_group group;
 94         unsigned int cl_tcp_port;
 95         unsigned int cl_buffer_size;
 96         unsigned int cl_rsbtbl_size;
 97         unsigned int cl_dirtbl_size;
 98         unsigned int cl_recover_timer;
 99         unsigned int cl_toss_secs;
100         unsigned int cl_scan_secs;
101         unsigned int cl_log_debug;
102         unsigned int cl_protocol;
103         unsigned int cl_timewarn_cs;
104         unsigned int cl_waitwarn_us;
105         unsigned int cl_new_rsb_count;
106 };
107 
108 enum {
109         CLUSTER_ATTR_TCP_PORT = 0,
110         CLUSTER_ATTR_BUFFER_SIZE,
111         CLUSTER_ATTR_RSBTBL_SIZE,
112         CLUSTER_ATTR_DIRTBL_SIZE,
113         CLUSTER_ATTR_RECOVER_TIMER,
114         CLUSTER_ATTR_TOSS_SECS,
115         CLUSTER_ATTR_SCAN_SECS,
116         CLUSTER_ATTR_LOG_DEBUG,
117         CLUSTER_ATTR_PROTOCOL,
118         CLUSTER_ATTR_TIMEWARN_CS,
119         CLUSTER_ATTR_WAITWARN_US,
120         CLUSTER_ATTR_NEW_RSB_COUNT,
121 };
122 
123 struct cluster_attribute {
124         struct configfs_attribute attr;
125         ssize_t (*show)(struct dlm_cluster *, char *);
126         ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
127 };
128 
129 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
130                            int *info_field, int check_zero,
131                            const char *buf, size_t len)
132 {
133         unsigned int x;
134 
135         if (!capable(CAP_SYS_ADMIN))
136                 return -EACCES;
137 
138         x = simple_strtoul(buf, NULL, 0);
139 
140         if (check_zero && !x)
141                 return -EINVAL;
142 
143         *cl_field = x;
144         *info_field = x;
145 
146         return len;
147 }
148 
149 #define CLUSTER_ATTR(name, check_zero)                                        \
150 static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
151 {                                                                             \
152         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
153                            check_zero, buf, len);                             \
154 }                                                                             \
155 static ssize_t name##_read(struct dlm_cluster *cl, char *buf)                 \
156 {                                                                             \
157         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
158 }                                                                             \
159 static struct cluster_attribute cluster_attr_##name =                         \
160 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
161 
162 CLUSTER_ATTR(tcp_port, 1);
163 CLUSTER_ATTR(buffer_size, 1);
164 CLUSTER_ATTR(rsbtbl_size, 1);
165 CLUSTER_ATTR(dirtbl_size, 1);
166 CLUSTER_ATTR(recover_timer, 1);
167 CLUSTER_ATTR(toss_secs, 1);
168 CLUSTER_ATTR(scan_secs, 1);
169 CLUSTER_ATTR(log_debug, 0);
170 CLUSTER_ATTR(protocol, 0);
171 CLUSTER_ATTR(timewarn_cs, 1);
172 CLUSTER_ATTR(waitwarn_us, 0);
173 CLUSTER_ATTR(new_rsb_count, 0);
174 
175 static struct configfs_attribute *cluster_attrs[] = {
176         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
177         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
178         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
179         [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr,
180         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
181         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
182         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
183         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
184         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
185         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
186         [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr,
187         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count.attr,
188         NULL,
189 };
190 
191 enum {
192         COMM_ATTR_NODEID = 0,
193         COMM_ATTR_LOCAL,
194         COMM_ATTR_ADDR,
195         COMM_ATTR_ADDR_LIST,
196 };
197 
198 struct comm_attribute {
199         struct configfs_attribute attr;
200         ssize_t (*show)(struct dlm_comm *, char *);
201         ssize_t (*store)(struct dlm_comm *, const char *, size_t);
202 };
203 
204 static struct comm_attribute comm_attr_nodeid = {
205         .attr   = { .ca_owner = THIS_MODULE,
206                     .ca_name = "nodeid",
207                     .ca_mode = S_IRUGO | S_IWUSR },
208         .show   = comm_nodeid_read,
209         .store  = comm_nodeid_write,
210 };
211 
212 static struct comm_attribute comm_attr_local = {
213         .attr   = { .ca_owner = THIS_MODULE,
214                     .ca_name = "local",
215                     .ca_mode = S_IRUGO | S_IWUSR },
216         .show   = comm_local_read,
217         .store  = comm_local_write,
218 };
219 
220 static struct comm_attribute comm_attr_addr = {
221         .attr   = { .ca_owner = THIS_MODULE,
222                     .ca_name = "addr",
223                     .ca_mode = S_IWUSR },
224         .store  = comm_addr_write,
225 };
226 
227 static struct comm_attribute comm_attr_addr_list = {
228         .attr   = { .ca_owner = THIS_MODULE,
229                     .ca_name = "addr_list",
230                     .ca_mode = S_IRUGO },
231         .show   = comm_addr_list_read,
232 };
233 
234 static struct configfs_attribute *comm_attrs[] = {
235         [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
236         [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
237         [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
238         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list.attr,
239         NULL,
240 };
241 
242 enum {
243         NODE_ATTR_NODEID = 0,
244         NODE_ATTR_WEIGHT,
245 };
246 
247 struct node_attribute {
248         struct configfs_attribute attr;
249         ssize_t (*show)(struct dlm_node *, char *);
250         ssize_t (*store)(struct dlm_node *, const char *, size_t);
251 };
252 
253 static struct node_attribute node_attr_nodeid = {
254         .attr   = { .ca_owner = THIS_MODULE,
255                     .ca_name = "nodeid",
256                     .ca_mode = S_IRUGO | S_IWUSR },
257         .show   = node_nodeid_read,
258         .store  = node_nodeid_write,
259 };
260 
261 static struct node_attribute node_attr_weight = {
262         .attr   = { .ca_owner = THIS_MODULE,
263                     .ca_name = "weight",
264                     .ca_mode = S_IRUGO | S_IWUSR },
265         .show   = node_weight_read,
266         .store  = node_weight_write,
267 };
268 
269 static struct configfs_attribute *node_attrs[] = {
270         [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
271         [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
272         NULL,
273 };
274 
275 struct dlm_clusters {
276         struct configfs_subsystem subsys;
277 };
278 
279 struct dlm_spaces {
280         struct config_group ss_group;
281 };
282 
283 struct dlm_space {
284         struct config_group group;
285         struct list_head members;
286         struct mutex members_lock;
287         int members_count;
288 };
289 
290 struct dlm_comms {
291         struct config_group cs_group;
292 };
293 
294 struct dlm_comm {
295         struct config_item item;
296         int nodeid;
297         int local;
298         int addr_count;
299         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
300 };
301 
302 struct dlm_nodes {
303         struct config_group ns_group;
304 };
305 
306 struct dlm_node {
307         struct config_item item;
308         struct list_head list; /* space->members */
309         int nodeid;
310         int weight;
311         int new;
312 };
313 
314 static struct configfs_group_operations clusters_ops = {
315         .make_group = make_cluster,
316         .drop_item = drop_cluster,
317 };
318 
319 static struct configfs_item_operations cluster_ops = {
320         .release = release_cluster,
321         .show_attribute = show_cluster,
322         .store_attribute = store_cluster,
323 };
324 
325 static struct configfs_group_operations spaces_ops = {
326         .make_group = make_space,
327         .drop_item = drop_space,
328 };
329 
330 static struct configfs_item_operations space_ops = {
331         .release = release_space,
332 };
333 
334 static struct configfs_group_operations comms_ops = {
335         .make_item = make_comm,
336         .drop_item = drop_comm,
337 };
338 
339 static struct configfs_item_operations comm_ops = {
340         .release = release_comm,
341         .show_attribute = show_comm,
342         .store_attribute = store_comm,
343 };
344 
345 static struct configfs_group_operations nodes_ops = {
346         .make_item = make_node,
347         .drop_item = drop_node,
348 };
349 
350 static struct configfs_item_operations node_ops = {
351         .release = release_node,
352         .show_attribute = show_node,
353         .store_attribute = store_node,
354 };
355 
356 static struct config_item_type clusters_type = {
357         .ct_group_ops = &clusters_ops,
358         .ct_owner = THIS_MODULE,
359 };
360 
361 static struct config_item_type cluster_type = {
362         .ct_item_ops = &cluster_ops,
363         .ct_attrs = cluster_attrs,
364         .ct_owner = THIS_MODULE,
365 };
366 
367 static struct config_item_type spaces_type = {
368         .ct_group_ops = &spaces_ops,
369         .ct_owner = THIS_MODULE,
370 };
371 
372 static struct config_item_type space_type = {
373         .ct_item_ops = &space_ops,
374         .ct_owner = THIS_MODULE,
375 };
376 
377 static struct config_item_type comms_type = {
378         .ct_group_ops = &comms_ops,
379         .ct_owner = THIS_MODULE,
380 };
381 
382 static struct config_item_type comm_type = {
383         .ct_item_ops = &comm_ops,
384         .ct_attrs = comm_attrs,
385         .ct_owner = THIS_MODULE,
386 };
387 
388 static struct config_item_type nodes_type = {
389         .ct_group_ops = &nodes_ops,
390         .ct_owner = THIS_MODULE,
391 };
392 
393 static struct config_item_type node_type = {
394         .ct_item_ops = &node_ops,
395         .ct_attrs = node_attrs,
396         .ct_owner = THIS_MODULE,
397 };
398 
399 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
400 {
401         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
402                    NULL;
403 }
404 
405 static struct dlm_space *config_item_to_space(struct config_item *i)
406 {
407         return i ? container_of(to_config_group(i), struct dlm_space, group) :
408                    NULL;
409 }
410 
411 static struct dlm_comm *config_item_to_comm(struct config_item *i)
412 {
413         return i ? container_of(i, struct dlm_comm, item) : NULL;
414 }
415 
416 static struct dlm_node *config_item_to_node(struct config_item *i)
417 {
418         return i ? container_of(i, struct dlm_node, item) : NULL;
419 }
420 
421 static struct config_group *make_cluster(struct config_group *g,
422                                          const char *name)
423 {
424         struct dlm_cluster *cl = NULL;
425         struct dlm_spaces *sps = NULL;
426         struct dlm_comms *cms = NULL;
427         void *gps = NULL;
428 
429         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
430         gps = kcalloc(3, sizeof(struct config_group *), GFP_NOFS);
431         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
432         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
433 
434         if (!cl || !gps || !sps || !cms)
435                 goto fail;
436 
437         config_group_init_type_name(&cl->group, name, &cluster_type);
438         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
439         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
440 
441         cl->group.default_groups = gps;
442         cl->group.default_groups[0] = &sps->ss_group;
443         cl->group.default_groups[1] = &cms->cs_group;
444         cl->group.default_groups[2] = NULL;
445 
446         cl->cl_tcp_port = dlm_config.ci_tcp_port;
447         cl->cl_buffer_size = dlm_config.ci_buffer_size;
448         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
449         cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
450         cl->cl_recover_timer = dlm_config.ci_recover_timer;
451         cl->cl_toss_secs = dlm_config.ci_toss_secs;
452         cl->cl_scan_secs = dlm_config.ci_scan_secs;
453         cl->cl_log_debug = dlm_config.ci_log_debug;
454         cl->cl_protocol = dlm_config.ci_protocol;
455         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
456         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
457         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
458 
459         space_list = &sps->ss_group;
460         comm_list = &cms->cs_group;
461         return &cl->group;
462 
463  fail:
464         kfree(cl);
465         kfree(gps);
466         kfree(sps);
467         kfree(cms);
468         return ERR_PTR(-ENOMEM);
469 }
470 
471 static void drop_cluster(struct config_group *g, struct config_item *i)
472 {
473         struct dlm_cluster *cl = config_item_to_cluster(i);
474         struct config_item *tmp;
475         int j;
476 
477         for (j = 0; cl->group.default_groups[j]; j++) {
478                 tmp = &cl->group.default_groups[j]->cg_item;
479                 cl->group.default_groups[j] = NULL;
480                 config_item_put(tmp);
481         }
482 
483         space_list = NULL;
484         comm_list = NULL;
485 
486         config_item_put(i);
487 }
488 
489 static void release_cluster(struct config_item *i)
490 {
491         struct dlm_cluster *cl = config_item_to_cluster(i);
492         kfree(cl->group.default_groups);
493         kfree(cl);
494 }
495 
496 static struct config_group *make_space(struct config_group *g, const char *name)
497 {
498         struct dlm_space *sp = NULL;
499         struct dlm_nodes *nds = NULL;
500         void *gps = NULL;
501 
502         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
503         gps = kcalloc(2, sizeof(struct config_group *), GFP_NOFS);
504         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
505 
506         if (!sp || !gps || !nds)
507                 goto fail;
508 
509         config_group_init_type_name(&sp->group, name, &space_type);
510         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
511 
512         sp->group.default_groups = gps;
513         sp->group.default_groups[0] = &nds->ns_group;
514         sp->group.default_groups[1] = NULL;
515 
516         INIT_LIST_HEAD(&sp->members);
517         mutex_init(&sp->members_lock);
518         sp->members_count = 0;
519         return &sp->group;
520 
521  fail:
522         kfree(sp);
523         kfree(gps);
524         kfree(nds);
525         return ERR_PTR(-ENOMEM);
526 }
527 
528 static void drop_space(struct config_group *g, struct config_item *i)
529 {
530         struct dlm_space *sp = config_item_to_space(i);
531         struct config_item *tmp;
532         int j;
533 
534         /* assert list_empty(&sp->members) */
535 
536         for (j = 0; sp->group.default_groups[j]; j++) {
537                 tmp = &sp->group.default_groups[j]->cg_item;
538                 sp->group.default_groups[j] = NULL;
539                 config_item_put(tmp);
540         }
541 
542         config_item_put(i);
543 }
544 
545 static void release_space(struct config_item *i)
546 {
547         struct dlm_space *sp = config_item_to_space(i);
548         kfree(sp->group.default_groups);
549         kfree(sp);
550 }
551 
552 static struct config_item *make_comm(struct config_group *g, const char *name)
553 {
554         struct dlm_comm *cm;
555 
556         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
557         if (!cm)
558                 return ERR_PTR(-ENOMEM);
559 
560         config_item_init_type_name(&cm->item, name, &comm_type);
561         cm->nodeid = -1;
562         cm->local = 0;
563         cm->addr_count = 0;
564         return &cm->item;
565 }
566 
567 static void drop_comm(struct config_group *g, struct config_item *i)
568 {
569         struct dlm_comm *cm = config_item_to_comm(i);
570         if (local_comm == cm)
571                 local_comm = NULL;
572         dlm_lowcomms_close(cm->nodeid);
573         while (cm->addr_count--)
574                 kfree(cm->addr[cm->addr_count]);
575         config_item_put(i);
576 }
577 
578 static void release_comm(struct config_item *i)
579 {
580         struct dlm_comm *cm = config_item_to_comm(i);
581         kfree(cm);
582 }
583 
584 static struct config_item *make_node(struct config_group *g, const char *name)
585 {
586         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
587         struct dlm_node *nd;
588 
589         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
590         if (!nd)
591                 return ERR_PTR(-ENOMEM);
592 
593         config_item_init_type_name(&nd->item, name, &node_type);
594         nd->nodeid = -1;
595         nd->weight = 1;  /* default weight of 1 if none is set */
596         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
597 
598         mutex_lock(&sp->members_lock);
599         list_add(&nd->list, &sp->members);
600         sp->members_count++;
601         mutex_unlock(&sp->members_lock);
602 
603         return &nd->item;
604 }
605 
606 static void drop_node(struct config_group *g, struct config_item *i)
607 {
608         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
609         struct dlm_node *nd = config_item_to_node(i);
610 
611         mutex_lock(&sp->members_lock);
612         list_del(&nd->list);
613         sp->members_count--;
614         mutex_unlock(&sp->members_lock);
615 
616         config_item_put(i);
617 }
618 
619 static void release_node(struct config_item *i)
620 {
621         struct dlm_node *nd = config_item_to_node(i);
622         kfree(nd);
623 }
624 
625 static struct dlm_clusters clusters_root = {
626         .subsys = {
627                 .su_group = {
628                         .cg_item = {
629                                 .ci_namebuf = "dlm",
630                                 .ci_type = &clusters_type,
631                         },
632                 },
633         },
634 };
635 
636 int __init dlm_config_init(void)
637 {
638         config_group_init(&clusters_root.subsys.su_group);
639         mutex_init(&clusters_root.subsys.su_mutex);
640         return configfs_register_subsystem(&clusters_root.subsys);
641 }
642 
643 void dlm_config_exit(void)
644 {
645         configfs_unregister_subsystem(&clusters_root.subsys);
646 }
647 
648 /*
649  * Functions for user space to read/write attributes
650  */
651 
652 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
653                             char *buf)
654 {
655         struct dlm_cluster *cl = config_item_to_cluster(i);
656         struct cluster_attribute *cla =
657                         container_of(a, struct cluster_attribute, attr);
658         return cla->show ? cla->show(cl, buf) : 0;
659 }
660 
661 static ssize_t store_cluster(struct config_item *i,
662                              struct configfs_attribute *a,
663                              const char *buf, size_t len)
664 {
665         struct dlm_cluster *cl = config_item_to_cluster(i);
666         struct cluster_attribute *cla =
667                 container_of(a, struct cluster_attribute, attr);
668         return cla->store ? cla->store(cl, buf, len) : -EINVAL;
669 }
670 
671 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
672                          char *buf)
673 {
674         struct dlm_comm *cm = config_item_to_comm(i);
675         struct comm_attribute *cma =
676                         container_of(a, struct comm_attribute, attr);
677         return cma->show ? cma->show(cm, buf) : 0;
678 }
679 
680 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
681                           const char *buf, size_t len)
682 {
683         struct dlm_comm *cm = config_item_to_comm(i);
684         struct comm_attribute *cma =
685                 container_of(a, struct comm_attribute, attr);
686         return cma->store ? cma->store(cm, buf, len) : -EINVAL;
687 }
688 
689 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf)
690 {
691         return sprintf(buf, "%d\n", cm->nodeid);
692 }
693 
694 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
695                                  size_t len)
696 {
697         cm->nodeid = simple_strtol(buf, NULL, 0);
698         return len;
699 }
700 
701 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
702 {
703         return sprintf(buf, "%d\n", cm->local);
704 }
705 
706 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
707                                 size_t len)
708 {
709         cm->local= simple_strtol(buf, NULL, 0);
710         if (cm->local && !local_comm)
711                 local_comm = cm;
712         return len;
713 }
714 
715 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
716 {
717         struct sockaddr_storage *addr;
718 
719         if (len != sizeof(struct sockaddr_storage))
720                 return -EINVAL;
721 
722         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
723                 return -ENOSPC;
724 
725         addr = kzalloc(sizeof(*addr), GFP_NOFS);
726         if (!addr)
727                 return -ENOMEM;
728 
729         memcpy(addr, buf, len);
730         cm->addr[cm->addr_count++] = addr;
731         return len;
732 }
733 
734 static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf)
735 {
736         ssize_t s;
737         ssize_t allowance;
738         int i;
739         struct sockaddr_storage *addr;
740         struct sockaddr_in *addr_in;
741         struct sockaddr_in6 *addr_in6;
742         
743         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
744         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
745         
746 
747         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
748         allowance = 4096;
749         buf[0] = '\0';
750 
751         for (i = 0; i < cm->addr_count; i++) {
752                 addr = cm->addr[i];
753 
754                 switch(addr->ss_family) {
755                 case AF_INET:
756                         addr_in = (struct sockaddr_in *)addr;
757                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
758                         break;
759                 case AF_INET6:
760                         addr_in6 = (struct sockaddr_in6 *)addr;
761                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
762                         break;
763                 default:
764                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
765                         break;
766                 }
767                 allowance -= s;
768                 if (allowance >= 0)
769                         strcat(buf, buf0);
770                 else {
771                         allowance += s;
772                         break;
773                 }
774         }
775         return 4096 - allowance;
776 }
777 
778 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
779                          char *buf)
780 {
781         struct dlm_node *nd = config_item_to_node(i);
782         struct node_attribute *nda =
783                         container_of(a, struct node_attribute, attr);
784         return nda->show ? nda->show(nd, buf) : 0;
785 }
786 
787 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
788                           const char *buf, size_t len)
789 {
790         struct dlm_node *nd = config_item_to_node(i);
791         struct node_attribute *nda =
792                 container_of(a, struct node_attribute, attr);
793         return nda->store ? nda->store(nd, buf, len) : -EINVAL;
794 }
795 
796 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
797 {
798         return sprintf(buf, "%d\n", nd->nodeid);
799 }
800 
801 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
802                                  size_t len)
803 {
804         nd->nodeid = simple_strtol(buf, NULL, 0);
805         return len;
806 }
807 
808 static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
809 {
810         return sprintf(buf, "%d\n", nd->weight);
811 }
812 
813 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
814                                  size_t len)
815 {
816         nd->weight = simple_strtol(buf, NULL, 0);
817         return len;
818 }
819 
820 /*
821  * Functions for the dlm to get the info that's been configured
822  */
823 
824 static struct dlm_space *get_space(char *name)
825 {
826         struct config_item *i;
827 
828         if (!space_list)
829                 return NULL;
830 
831         mutex_lock(&space_list->cg_subsys->su_mutex);
832         i = config_group_find_item(space_list, name);
833         mutex_unlock(&space_list->cg_subsys->su_mutex);
834 
835         return config_item_to_space(i);
836 }
837 
838 static void put_space(struct dlm_space *sp)
839 {
840         config_item_put(&sp->group.cg_item);
841 }
842 
843 static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y)
844 {
845         switch (x->ss_family) {
846         case AF_INET: {
847                 struct sockaddr_in *sinx = (struct sockaddr_in *)x;
848                 struct sockaddr_in *siny = (struct sockaddr_in *)y;
849                 if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr)
850                         return 0;
851                 if (sinx->sin_port != siny->sin_port)
852                         return 0;
853                 break;
854         }
855         case AF_INET6: {
856                 struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x;
857                 struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y;
858                 if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr))
859                         return 0;
860                 if (sinx->sin6_port != siny->sin6_port)
861                         return 0;
862                 break;
863         }
864         default:
865                 return 0;
866         }
867         return 1;
868 }
869 
870 static struct dlm_comm *get_comm(int nodeid, struct sockaddr_storage *addr)
871 {
872         struct config_item *i;
873         struct dlm_comm *cm = NULL;
874         int found = 0;
875 
876         if (!comm_list)
877                 return NULL;
878 
879         mutex_lock(&clusters_root.subsys.su_mutex);
880 
881         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
882                 cm = config_item_to_comm(i);
883 
884                 if (nodeid) {
885                         if (cm->nodeid != nodeid)
886                                 continue;
887                         found = 1;
888                         config_item_get(i);
889                         break;
890                 } else {
891                         if (!cm->addr_count || !addr_compare(cm->addr[0], addr))
892                                 continue;
893                         found = 1;
894                         config_item_get(i);
895                         break;
896                 }
897         }
898         mutex_unlock(&clusters_root.subsys.su_mutex);
899 
900         if (!found)
901                 cm = NULL;
902         return cm;
903 }
904 
905 static void put_comm(struct dlm_comm *cm)
906 {
907         config_item_put(&cm->item);
908 }
909 
910 /* caller must free mem */
911 int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out,
912                     int **new_out, int *new_count_out)
913 {
914         struct dlm_space *sp;
915         struct dlm_node *nd;
916         int i = 0, rv = 0, ids_count = 0, new_count = 0;
917         int *ids, *new;
918 
919         sp = get_space(lsname);
920         if (!sp)
921                 return -EEXIST;
922 
923         mutex_lock(&sp->members_lock);
924         if (!sp->members_count) {
925                 rv = -EINVAL;
926                 printk(KERN_ERR "dlm: zero members_count\n");
927                 goto out;
928         }
929 
930         ids_count = sp->members_count;
931 
932         ids = kcalloc(ids_count, sizeof(int), GFP_NOFS);
933         if (!ids) {
934                 rv = -ENOMEM;
935                 goto out;
936         }
937 
938         list_for_each_entry(nd, &sp->members, list) {
939                 ids[i++] = nd->nodeid;
940                 if (nd->new)
941                         new_count++;
942         }
943 
944         if (ids_count != i)
945                 printk(KERN_ERR "dlm: bad nodeid count %d %d\n", ids_count, i);
946 
947         if (!new_count)
948                 goto out_ids;
949 
950         new = kcalloc(new_count, sizeof(int), GFP_NOFS);
951         if (!new) {
952                 kfree(ids);
953                 rv = -ENOMEM;
954                 goto out;
955         }
956 
957         i = 0;
958         list_for_each_entry(nd, &sp->members, list) {
959                 if (nd->new) {
960                         new[i++] = nd->nodeid;
961                         nd->new = 0;
962                 }
963         }
964         *new_count_out = new_count;
965         *new_out = new;
966 
967  out_ids:
968         *ids_count_out = ids_count;
969         *ids_out = ids;
970  out:
971         mutex_unlock(&sp->members_lock);
972         put_space(sp);
973         return rv;
974 }
975 
976 int dlm_node_weight(char *lsname, int nodeid)
977 {
978         struct dlm_space *sp;
979         struct dlm_node *nd;
980         int w = -EEXIST;
981 
982         sp = get_space(lsname);
983         if (!sp)
984                 goto out;
985 
986         mutex_lock(&sp->members_lock);
987         list_for_each_entry(nd, &sp->members, list) {
988                 if (nd->nodeid != nodeid)
989                         continue;
990                 w = nd->weight;
991                 break;
992         }
993         mutex_unlock(&sp->members_lock);
994         put_space(sp);
995  out:
996         return w;
997 }
998 
999 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
1000 {
1001         struct dlm_comm *cm = get_comm(nodeid, NULL);
1002         if (!cm)
1003                 return -EEXIST;
1004         if (!cm->addr_count)
1005                 return -ENOENT;
1006         memcpy(addr, cm->addr[0], sizeof(*addr));
1007         put_comm(cm);
1008         return 0;
1009 }
1010 
1011 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
1012 {
1013         struct dlm_comm *cm = get_comm(0, addr);
1014         if (!cm)
1015                 return -EEXIST;
1016         *nodeid = cm->nodeid;
1017         put_comm(cm);
1018         return 0;
1019 }
1020 
1021 int dlm_our_nodeid(void)
1022 {
1023         return local_comm ? local_comm->nodeid : 0;
1024 }
1025 
1026 /* num 0 is first addr, num 1 is second addr */
1027 int dlm_our_addr(struct sockaddr_storage *addr, int num)
1028 {
1029         if (!local_comm)
1030                 return -1;
1031         if (num + 1 > local_comm->addr_count)
1032                 return -1;
1033         memcpy(addr, local_comm->addr[num], sizeof(*addr));
1034         return 0;
1035 }
1036 
1037 /* Config file defaults */
1038 #define DEFAULT_TCP_PORT       21064
1039 #define DEFAULT_BUFFER_SIZE     4096
1040 #define DEFAULT_RSBTBL_SIZE     1024
1041 #define DEFAULT_DIRTBL_SIZE     1024
1042 #define DEFAULT_RECOVER_TIMER      5
1043 #define DEFAULT_TOSS_SECS         10
1044 #define DEFAULT_SCAN_SECS          5
1045 #define DEFAULT_LOG_DEBUG          0
1046 #define DEFAULT_PROTOCOL           0
1047 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
1048 #define DEFAULT_WAITWARN_US        0
1049 #define DEFAULT_NEW_RSB_COUNT    128
1050 
1051 struct dlm_config_info dlm_config = {
1052         .ci_tcp_port = DEFAULT_TCP_PORT,
1053         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
1054         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
1055         .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
1056         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
1057         .ci_toss_secs = DEFAULT_TOSS_SECS,
1058         .ci_scan_secs = DEFAULT_SCAN_SECS,
1059         .ci_log_debug = DEFAULT_LOG_DEBUG,
1060         .ci_protocol = DEFAULT_PROTOCOL,
1061         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
1062         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
1063         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT
1064 };
1065 
1066 

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