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Linux/fs/dlm/config.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /******************************************************************************
  3 *******************************************************************************
  4 **
  5 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
  6 **  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
  7 **
  8 **
  9 *******************************************************************************
 10 ******************************************************************************/
 11 
 12 #include <linux/kernel.h>
 13 #include <linux/init.h>
 14 #include <linux/configfs.h>
 15 #include <linux/slab.h>
 16 #include <linux/in.h>
 17 #include <linux/in6.h>
 18 #include <linux/dlmconstants.h>
 19 #include <net/ipv6.h>
 20 #include <net/sock.h>
 21 
 22 #include "config.h"
 23 #include "lowcomms.h"
 24 
 25 /*
 26  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
 27  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
 28  * /config/dlm/<cluster>/comms/<comm>/nodeid
 29  * /config/dlm/<cluster>/comms/<comm>/local
 30  * /config/dlm/<cluster>/comms/<comm>/addr      (write only)
 31  * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
 32  * The <cluster> level is useless, but I haven't figured out how to avoid it.
 33  */
 34 
 35 static struct config_group *space_list;
 36 static struct config_group *comm_list;
 37 static struct dlm_comm *local_comm;
 38 static uint32_t dlm_comm_count;
 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 struct configfs_attribute *comm_attrs[];
 63 static struct configfs_attribute *node_attrs[];
 64 
 65 struct dlm_cluster {
 66         struct config_group group;
 67         unsigned int cl_tcp_port;
 68         unsigned int cl_buffer_size;
 69         unsigned int cl_rsbtbl_size;
 70         unsigned int cl_recover_timer;
 71         unsigned int cl_toss_secs;
 72         unsigned int cl_scan_secs;
 73         unsigned int cl_log_debug;
 74         unsigned int cl_log_info;
 75         unsigned int cl_protocol;
 76         unsigned int cl_timewarn_cs;
 77         unsigned int cl_waitwarn_us;
 78         unsigned int cl_new_rsb_count;
 79         unsigned int cl_recover_callbacks;
 80         char cl_cluster_name[DLM_LOCKSPACE_LEN];
 81 };
 82 
 83 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
 84 {
 85         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
 86                    NULL;
 87 }
 88 
 89 enum {
 90         CLUSTER_ATTR_TCP_PORT = 0,
 91         CLUSTER_ATTR_BUFFER_SIZE,
 92         CLUSTER_ATTR_RSBTBL_SIZE,
 93         CLUSTER_ATTR_RECOVER_TIMER,
 94         CLUSTER_ATTR_TOSS_SECS,
 95         CLUSTER_ATTR_SCAN_SECS,
 96         CLUSTER_ATTR_LOG_DEBUG,
 97         CLUSTER_ATTR_LOG_INFO,
 98         CLUSTER_ATTR_PROTOCOL,
 99         CLUSTER_ATTR_TIMEWARN_CS,
100         CLUSTER_ATTR_WAITWARN_US,
101         CLUSTER_ATTR_NEW_RSB_COUNT,
102         CLUSTER_ATTR_RECOVER_CALLBACKS,
103         CLUSTER_ATTR_CLUSTER_NAME,
104 };
105 
106 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
107 {
108         struct dlm_cluster *cl = config_item_to_cluster(item);
109         return sprintf(buf, "%s\n", cl->cl_cluster_name);
110 }
111 
112 static ssize_t cluster_cluster_name_store(struct config_item *item,
113                                           const char *buf, size_t len)
114 {
115         struct dlm_cluster *cl = config_item_to_cluster(item);
116 
117         strlcpy(dlm_config.ci_cluster_name, buf,
118                                 sizeof(dlm_config.ci_cluster_name));
119         strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
120         return len;
121 }
122 
123 CONFIGFS_ATTR(cluster_, cluster_name);
124 
125 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
126                            int *info_field, int check_zero,
127                            const char *buf, size_t len)
128 {
129         unsigned int x;
130         int rc;
131 
132         if (!capable(CAP_SYS_ADMIN))
133                 return -EPERM;
134         rc = kstrtouint(buf, 0, &x);
135         if (rc)
136                 return rc;
137 
138         if (check_zero && !x)
139                 return -EINVAL;
140 
141         *cl_field = x;
142         *info_field = x;
143 
144         return len;
145 }
146 
147 #define CLUSTER_ATTR(name, check_zero)                                        \
148 static ssize_t cluster_##name##_store(struct config_item *item, \
149                 const char *buf, size_t len) \
150 {                                                                             \
151         struct dlm_cluster *cl = config_item_to_cluster(item);                \
152         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
153                            check_zero, buf, len);                             \
154 }                                                                             \
155 static ssize_t cluster_##name##_show(struct config_item *item, char *buf)     \
156 {                                                                             \
157         struct dlm_cluster *cl = config_item_to_cluster(item);                \
158         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
159 }                                                                             \
160 CONFIGFS_ATTR(cluster_, name);
161 
162 CLUSTER_ATTR(tcp_port, 1);
163 CLUSTER_ATTR(buffer_size, 1);
164 CLUSTER_ATTR(rsbtbl_size, 1);
165 CLUSTER_ATTR(recover_timer, 1);
166 CLUSTER_ATTR(toss_secs, 1);
167 CLUSTER_ATTR(scan_secs, 1);
168 CLUSTER_ATTR(log_debug, 0);
169 CLUSTER_ATTR(log_info, 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 CLUSTER_ATTR(recover_callbacks, 0);
175 
176 static struct configfs_attribute *cluster_attrs[] = {
177         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
178         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
179         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
180         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
181         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
182         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
183         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
184         [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
185         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
186         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
187         [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
188         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
189         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
190         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
191         NULL,
192 };
193 
194 enum {
195         COMM_ATTR_NODEID = 0,
196         COMM_ATTR_LOCAL,
197         COMM_ATTR_ADDR,
198         COMM_ATTR_ADDR_LIST,
199 };
200 
201 enum {
202         NODE_ATTR_NODEID = 0,
203         NODE_ATTR_WEIGHT,
204 };
205 
206 struct dlm_clusters {
207         struct configfs_subsystem subsys;
208 };
209 
210 struct dlm_spaces {
211         struct config_group ss_group;
212 };
213 
214 struct dlm_space {
215         struct config_group group;
216         struct list_head members;
217         struct mutex members_lock;
218         int members_count;
219 };
220 
221 struct dlm_comms {
222         struct config_group cs_group;
223 };
224 
225 struct dlm_comm {
226         struct config_item item;
227         int seq;
228         int nodeid;
229         int local;
230         int addr_count;
231         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
232 };
233 
234 struct dlm_nodes {
235         struct config_group ns_group;
236 };
237 
238 struct dlm_node {
239         struct config_item item;
240         struct list_head list; /* space->members */
241         int nodeid;
242         int weight;
243         int new;
244         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
245 };
246 
247 static struct configfs_group_operations clusters_ops = {
248         .make_group = make_cluster,
249         .drop_item = drop_cluster,
250 };
251 
252 static struct configfs_item_operations cluster_ops = {
253         .release = release_cluster,
254 };
255 
256 static struct configfs_group_operations spaces_ops = {
257         .make_group = make_space,
258         .drop_item = drop_space,
259 };
260 
261 static struct configfs_item_operations space_ops = {
262         .release = release_space,
263 };
264 
265 static struct configfs_group_operations comms_ops = {
266         .make_item = make_comm,
267         .drop_item = drop_comm,
268 };
269 
270 static struct configfs_item_operations comm_ops = {
271         .release = release_comm,
272 };
273 
274 static struct configfs_group_operations nodes_ops = {
275         .make_item = make_node,
276         .drop_item = drop_node,
277 };
278 
279 static struct configfs_item_operations node_ops = {
280         .release = release_node,
281 };
282 
283 static const struct config_item_type clusters_type = {
284         .ct_group_ops = &clusters_ops,
285         .ct_owner = THIS_MODULE,
286 };
287 
288 static const struct config_item_type cluster_type = {
289         .ct_item_ops = &cluster_ops,
290         .ct_attrs = cluster_attrs,
291         .ct_owner = THIS_MODULE,
292 };
293 
294 static const struct config_item_type spaces_type = {
295         .ct_group_ops = &spaces_ops,
296         .ct_owner = THIS_MODULE,
297 };
298 
299 static const struct config_item_type space_type = {
300         .ct_item_ops = &space_ops,
301         .ct_owner = THIS_MODULE,
302 };
303 
304 static const struct config_item_type comms_type = {
305         .ct_group_ops = &comms_ops,
306         .ct_owner = THIS_MODULE,
307 };
308 
309 static const struct config_item_type comm_type = {
310         .ct_item_ops = &comm_ops,
311         .ct_attrs = comm_attrs,
312         .ct_owner = THIS_MODULE,
313 };
314 
315 static const struct config_item_type nodes_type = {
316         .ct_group_ops = &nodes_ops,
317         .ct_owner = THIS_MODULE,
318 };
319 
320 static const struct config_item_type node_type = {
321         .ct_item_ops = &node_ops,
322         .ct_attrs = node_attrs,
323         .ct_owner = THIS_MODULE,
324 };
325 
326 static struct dlm_space *config_item_to_space(struct config_item *i)
327 {
328         return i ? container_of(to_config_group(i), struct dlm_space, group) :
329                    NULL;
330 }
331 
332 static struct dlm_comm *config_item_to_comm(struct config_item *i)
333 {
334         return i ? container_of(i, struct dlm_comm, item) : NULL;
335 }
336 
337 static struct dlm_node *config_item_to_node(struct config_item *i)
338 {
339         return i ? container_of(i, struct dlm_node, item) : NULL;
340 }
341 
342 static struct config_group *make_cluster(struct config_group *g,
343                                          const char *name)
344 {
345         struct dlm_cluster *cl = NULL;
346         struct dlm_spaces *sps = NULL;
347         struct dlm_comms *cms = NULL;
348 
349         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
350         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
351         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
352 
353         if (!cl || !sps || !cms)
354                 goto fail;
355 
356         config_group_init_type_name(&cl->group, name, &cluster_type);
357         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
358         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
359 
360         configfs_add_default_group(&sps->ss_group, &cl->group);
361         configfs_add_default_group(&cms->cs_group, &cl->group);
362 
363         cl->cl_tcp_port = dlm_config.ci_tcp_port;
364         cl->cl_buffer_size = dlm_config.ci_buffer_size;
365         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
366         cl->cl_recover_timer = dlm_config.ci_recover_timer;
367         cl->cl_toss_secs = dlm_config.ci_toss_secs;
368         cl->cl_scan_secs = dlm_config.ci_scan_secs;
369         cl->cl_log_debug = dlm_config.ci_log_debug;
370         cl->cl_log_info = dlm_config.ci_log_info;
371         cl->cl_protocol = dlm_config.ci_protocol;
372         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
373         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
374         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
375         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
376         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
377                DLM_LOCKSPACE_LEN);
378 
379         space_list = &sps->ss_group;
380         comm_list = &cms->cs_group;
381         return &cl->group;
382 
383  fail:
384         kfree(cl);
385         kfree(sps);
386         kfree(cms);
387         return ERR_PTR(-ENOMEM);
388 }
389 
390 static void drop_cluster(struct config_group *g, struct config_item *i)
391 {
392         struct dlm_cluster *cl = config_item_to_cluster(i);
393 
394         configfs_remove_default_groups(&cl->group);
395 
396         space_list = NULL;
397         comm_list = NULL;
398 
399         config_item_put(i);
400 }
401 
402 static void release_cluster(struct config_item *i)
403 {
404         struct dlm_cluster *cl = config_item_to_cluster(i);
405         kfree(cl);
406 }
407 
408 static struct config_group *make_space(struct config_group *g, const char *name)
409 {
410         struct dlm_space *sp = NULL;
411         struct dlm_nodes *nds = NULL;
412 
413         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
414         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
415 
416         if (!sp || !nds)
417                 goto fail;
418 
419         config_group_init_type_name(&sp->group, name, &space_type);
420 
421         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
422         configfs_add_default_group(&nds->ns_group, &sp->group);
423 
424         INIT_LIST_HEAD(&sp->members);
425         mutex_init(&sp->members_lock);
426         sp->members_count = 0;
427         return &sp->group;
428 
429  fail:
430         kfree(sp);
431         kfree(nds);
432         return ERR_PTR(-ENOMEM);
433 }
434 
435 static void drop_space(struct config_group *g, struct config_item *i)
436 {
437         struct dlm_space *sp = config_item_to_space(i);
438 
439         /* assert list_empty(&sp->members) */
440 
441         configfs_remove_default_groups(&sp->group);
442         config_item_put(i);
443 }
444 
445 static void release_space(struct config_item *i)
446 {
447         struct dlm_space *sp = config_item_to_space(i);
448         kfree(sp);
449 }
450 
451 static struct config_item *make_comm(struct config_group *g, const char *name)
452 {
453         struct dlm_comm *cm;
454 
455         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
456         if (!cm)
457                 return ERR_PTR(-ENOMEM);
458 
459         config_item_init_type_name(&cm->item, name, &comm_type);
460 
461         cm->seq = dlm_comm_count++;
462         if (!cm->seq)
463                 cm->seq = dlm_comm_count++;
464 
465         cm->nodeid = -1;
466         cm->local = 0;
467         cm->addr_count = 0;
468         return &cm->item;
469 }
470 
471 static void drop_comm(struct config_group *g, struct config_item *i)
472 {
473         struct dlm_comm *cm = config_item_to_comm(i);
474         if (local_comm == cm)
475                 local_comm = NULL;
476         dlm_lowcomms_close(cm->nodeid);
477         while (cm->addr_count--)
478                 kfree(cm->addr[cm->addr_count]);
479         config_item_put(i);
480 }
481 
482 static void release_comm(struct config_item *i)
483 {
484         struct dlm_comm *cm = config_item_to_comm(i);
485         kfree(cm);
486 }
487 
488 static struct config_item *make_node(struct config_group *g, const char *name)
489 {
490         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
491         struct dlm_node *nd;
492 
493         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
494         if (!nd)
495                 return ERR_PTR(-ENOMEM);
496 
497         config_item_init_type_name(&nd->item, name, &node_type);
498         nd->nodeid = -1;
499         nd->weight = 1;  /* default weight of 1 if none is set */
500         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
501 
502         mutex_lock(&sp->members_lock);
503         list_add(&nd->list, &sp->members);
504         sp->members_count++;
505         mutex_unlock(&sp->members_lock);
506 
507         return &nd->item;
508 }
509 
510 static void drop_node(struct config_group *g, struct config_item *i)
511 {
512         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
513         struct dlm_node *nd = config_item_to_node(i);
514 
515         mutex_lock(&sp->members_lock);
516         list_del(&nd->list);
517         sp->members_count--;
518         mutex_unlock(&sp->members_lock);
519 
520         config_item_put(i);
521 }
522 
523 static void release_node(struct config_item *i)
524 {
525         struct dlm_node *nd = config_item_to_node(i);
526         kfree(nd);
527 }
528 
529 static struct dlm_clusters clusters_root = {
530         .subsys = {
531                 .su_group = {
532                         .cg_item = {
533                                 .ci_namebuf = "dlm",
534                                 .ci_type = &clusters_type,
535                         },
536                 },
537         },
538 };
539 
540 int __init dlm_config_init(void)
541 {
542         config_group_init(&clusters_root.subsys.su_group);
543         mutex_init(&clusters_root.subsys.su_mutex);
544         return configfs_register_subsystem(&clusters_root.subsys);
545 }
546 
547 void dlm_config_exit(void)
548 {
549         configfs_unregister_subsystem(&clusters_root.subsys);
550 }
551 
552 /*
553  * Functions for user space to read/write attributes
554  */
555 
556 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
557 {
558         return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
559 }
560 
561 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
562                                  size_t len)
563 {
564         int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
565 
566         if (rc)
567                 return rc;
568         return len;
569 }
570 
571 static ssize_t comm_local_show(struct config_item *item, char *buf)
572 {
573         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
574 }
575 
576 static ssize_t comm_local_store(struct config_item *item, const char *buf,
577                                 size_t len)
578 {
579         struct dlm_comm *cm = config_item_to_comm(item);
580         int rc = kstrtoint(buf, 0, &cm->local);
581 
582         if (rc)
583                 return rc;
584         if (cm->local && !local_comm)
585                 local_comm = cm;
586         return len;
587 }
588 
589 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
590                 size_t len)
591 {
592         struct dlm_comm *cm = config_item_to_comm(item);
593         struct sockaddr_storage *addr;
594         int rv;
595 
596         if (len != sizeof(struct sockaddr_storage))
597                 return -EINVAL;
598 
599         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
600                 return -ENOSPC;
601 
602         addr = kzalloc(sizeof(*addr), GFP_NOFS);
603         if (!addr)
604                 return -ENOMEM;
605 
606         memcpy(addr, buf, len);
607 
608         rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
609         if (rv) {
610                 kfree(addr);
611                 return rv;
612         }
613 
614         cm->addr[cm->addr_count++] = addr;
615         return len;
616 }
617 
618 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
619 {
620         struct dlm_comm *cm = config_item_to_comm(item);
621         ssize_t s;
622         ssize_t allowance;
623         int i;
624         struct sockaddr_storage *addr;
625         struct sockaddr_in *addr_in;
626         struct sockaddr_in6 *addr_in6;
627         
628         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
629         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
630         
631 
632         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
633         allowance = 4096;
634         buf[0] = '\0';
635 
636         for (i = 0; i < cm->addr_count; i++) {
637                 addr = cm->addr[i];
638 
639                 switch(addr->ss_family) {
640                 case AF_INET:
641                         addr_in = (struct sockaddr_in *)addr;
642                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
643                         break;
644                 case AF_INET6:
645                         addr_in6 = (struct sockaddr_in6 *)addr;
646                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
647                         break;
648                 default:
649                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
650                         break;
651                 }
652                 allowance -= s;
653                 if (allowance >= 0)
654                         strcat(buf, buf0);
655                 else {
656                         allowance += s;
657                         break;
658                 }
659         }
660         return 4096 - allowance;
661 }
662 
663 CONFIGFS_ATTR(comm_, nodeid);
664 CONFIGFS_ATTR(comm_, local);
665 CONFIGFS_ATTR_WO(comm_, addr);
666 CONFIGFS_ATTR_RO(comm_, addr_list);
667 
668 static struct configfs_attribute *comm_attrs[] = {
669         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
670         [COMM_ATTR_LOCAL] = &comm_attr_local,
671         [COMM_ATTR_ADDR] = &comm_attr_addr,
672         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
673         NULL,
674 };
675 
676 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
677 {
678         return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
679 }
680 
681 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
682                                  size_t len)
683 {
684         struct dlm_node *nd = config_item_to_node(item);
685         uint32_t seq = 0;
686         int rc = kstrtoint(buf, 0, &nd->nodeid);
687 
688         if (rc)
689                 return rc;
690         dlm_comm_seq(nd->nodeid, &seq);
691         nd->comm_seq = seq;
692         return len;
693 }
694 
695 static ssize_t node_weight_show(struct config_item *item, char *buf)
696 {
697         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
698 }
699 
700 static ssize_t node_weight_store(struct config_item *item, const char *buf,
701                                  size_t len)
702 {
703         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
704 
705         if (rc)
706                 return rc;
707         return len;
708 }
709 
710 CONFIGFS_ATTR(node_, nodeid);
711 CONFIGFS_ATTR(node_, weight);
712 
713 static struct configfs_attribute *node_attrs[] = {
714         [NODE_ATTR_NODEID] = &node_attr_nodeid,
715         [NODE_ATTR_WEIGHT] = &node_attr_weight,
716         NULL,
717 };
718 
719 /*
720  * Functions for the dlm to get the info that's been configured
721  */
722 
723 static struct dlm_space *get_space(char *name)
724 {
725         struct config_item *i;
726 
727         if (!space_list)
728                 return NULL;
729 
730         mutex_lock(&space_list->cg_subsys->su_mutex);
731         i = config_group_find_item(space_list, name);
732         mutex_unlock(&space_list->cg_subsys->su_mutex);
733 
734         return config_item_to_space(i);
735 }
736 
737 static void put_space(struct dlm_space *sp)
738 {
739         config_item_put(&sp->group.cg_item);
740 }
741 
742 static struct dlm_comm *get_comm(int nodeid)
743 {
744         struct config_item *i;
745         struct dlm_comm *cm = NULL;
746         int found = 0;
747 
748         if (!comm_list)
749                 return NULL;
750 
751         mutex_lock(&clusters_root.subsys.su_mutex);
752 
753         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
754                 cm = config_item_to_comm(i);
755 
756                 if (cm->nodeid != nodeid)
757                         continue;
758                 found = 1;
759                 config_item_get(i);
760                 break;
761         }
762         mutex_unlock(&clusters_root.subsys.su_mutex);
763 
764         if (!found)
765                 cm = NULL;
766         return cm;
767 }
768 
769 static void put_comm(struct dlm_comm *cm)
770 {
771         config_item_put(&cm->item);
772 }
773 
774 /* caller must free mem */
775 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
776                      int *count_out)
777 {
778         struct dlm_space *sp;
779         struct dlm_node *nd;
780         struct dlm_config_node *nodes, *node;
781         int rv, count;
782 
783         sp = get_space(lsname);
784         if (!sp)
785                 return -EEXIST;
786 
787         mutex_lock(&sp->members_lock);
788         if (!sp->members_count) {
789                 rv = -EINVAL;
790                 printk(KERN_ERR "dlm: zero members_count\n");
791                 goto out;
792         }
793 
794         count = sp->members_count;
795 
796         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
797         if (!nodes) {
798                 rv = -ENOMEM;
799                 goto out;
800         }
801 
802         node = nodes;
803         list_for_each_entry(nd, &sp->members, list) {
804                 node->nodeid = nd->nodeid;
805                 node->weight = nd->weight;
806                 node->new = nd->new;
807                 node->comm_seq = nd->comm_seq;
808                 node++;
809 
810                 nd->new = 0;
811         }
812 
813         *count_out = count;
814         *nodes_out = nodes;
815         rv = 0;
816  out:
817         mutex_unlock(&sp->members_lock);
818         put_space(sp);
819         return rv;
820 }
821 
822 int dlm_comm_seq(int nodeid, uint32_t *seq)
823 {
824         struct dlm_comm *cm = get_comm(nodeid);
825         if (!cm)
826                 return -EEXIST;
827         *seq = cm->seq;
828         put_comm(cm);
829         return 0;
830 }
831 
832 int dlm_our_nodeid(void)
833 {
834         return local_comm ? local_comm->nodeid : 0;
835 }
836 
837 /* num 0 is first addr, num 1 is second addr */
838 int dlm_our_addr(struct sockaddr_storage *addr, int num)
839 {
840         if (!local_comm)
841                 return -1;
842         if (num + 1 > local_comm->addr_count)
843                 return -1;
844         memcpy(addr, local_comm->addr[num], sizeof(*addr));
845         return 0;
846 }
847 
848 /* Config file defaults */
849 #define DEFAULT_TCP_PORT       21064
850 #define DEFAULT_BUFFER_SIZE     4096
851 #define DEFAULT_RSBTBL_SIZE     1024
852 #define DEFAULT_RECOVER_TIMER      5
853 #define DEFAULT_TOSS_SECS         10
854 #define DEFAULT_SCAN_SECS          5
855 #define DEFAULT_LOG_DEBUG          0
856 #define DEFAULT_LOG_INFO           1
857 #define DEFAULT_PROTOCOL           0
858 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
859 #define DEFAULT_WAITWARN_US        0
860 #define DEFAULT_NEW_RSB_COUNT    128
861 #define DEFAULT_RECOVER_CALLBACKS  0
862 #define DEFAULT_CLUSTER_NAME      ""
863 
864 struct dlm_config_info dlm_config = {
865         .ci_tcp_port = DEFAULT_TCP_PORT,
866         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
867         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
868         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
869         .ci_toss_secs = DEFAULT_TOSS_SECS,
870         .ci_scan_secs = DEFAULT_SCAN_SECS,
871         .ci_log_debug = DEFAULT_LOG_DEBUG,
872         .ci_log_info = DEFAULT_LOG_INFO,
873         .ci_protocol = DEFAULT_PROTOCOL,
874         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
875         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
876         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
877         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
878         .ci_cluster_name = DEFAULT_CLUSTER_NAME
879 };
880 
881 

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