linux/fs/dlm/config.c
<<
>>
Prefs
   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
  37static struct config_group *space_list;
  38static struct config_group *comm_list;
  39static struct dlm_comm *local_comm;
  40static uint32_t dlm_comm_count;
  41
  42struct dlm_clusters;
  43struct dlm_cluster;
  44struct dlm_spaces;
  45struct dlm_space;
  46struct dlm_comms;
  47struct dlm_comm;
  48struct dlm_nodes;
  49struct dlm_node;
  50
  51static struct config_group *make_cluster(struct config_group *, const char *);
  52static void drop_cluster(struct config_group *, struct config_item *);
  53static void release_cluster(struct config_item *);
  54static struct config_group *make_space(struct config_group *, const char *);
  55static void drop_space(struct config_group *, struct config_item *);
  56static void release_space(struct config_item *);
  57static struct config_item *make_comm(struct config_group *, const char *);
  58static void drop_comm(struct config_group *, struct config_item *);
  59static void release_comm(struct config_item *);
  60static struct config_item *make_node(struct config_group *, const char *);
  61static void drop_node(struct config_group *, struct config_item *);
  62static void release_node(struct config_item *);
  63
  64static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
  65                            char *buf);
  66static ssize_t store_cluster(struct config_item *i,
  67                             struct configfs_attribute *a,
  68                             const char *buf, size_t len);
  69static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
  70                         char *buf);
  71static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
  72                          const char *buf, size_t len);
  73static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
  74                         char *buf);
  75static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
  76                          const char *buf, size_t len);
  77
  78static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf);
  79static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
  80                                size_t len);
  81static ssize_t comm_local_read(struct dlm_comm *cm, char *buf);
  82static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
  83                                size_t len);
  84static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf,
  85                                size_t len);
  86static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf);
  87static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf);
  88static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
  89                                size_t len);
  90static ssize_t node_weight_read(struct dlm_node *nd, char *buf);
  91static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
  92                                size_t len);
  93
  94struct 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_recover_timer;
 100        unsigned int cl_toss_secs;
 101        unsigned int cl_scan_secs;
 102        unsigned int cl_log_debug;
 103        unsigned int cl_protocol;
 104        unsigned int cl_timewarn_cs;
 105        unsigned int cl_waitwarn_us;
 106        unsigned int cl_new_rsb_count;
 107        unsigned int cl_recover_callbacks;
 108        char cl_cluster_name[DLM_LOCKSPACE_LEN];
 109};
 110
 111enum {
 112        CLUSTER_ATTR_TCP_PORT = 0,
 113        CLUSTER_ATTR_BUFFER_SIZE,
 114        CLUSTER_ATTR_RSBTBL_SIZE,
 115        CLUSTER_ATTR_RECOVER_TIMER,
 116        CLUSTER_ATTR_TOSS_SECS,
 117        CLUSTER_ATTR_SCAN_SECS,
 118        CLUSTER_ATTR_LOG_DEBUG,
 119        CLUSTER_ATTR_PROTOCOL,
 120        CLUSTER_ATTR_TIMEWARN_CS,
 121        CLUSTER_ATTR_WAITWARN_US,
 122        CLUSTER_ATTR_NEW_RSB_COUNT,
 123        CLUSTER_ATTR_RECOVER_CALLBACKS,
 124        CLUSTER_ATTR_CLUSTER_NAME,
 125};
 126
 127struct cluster_attribute {
 128        struct configfs_attribute attr;
 129        ssize_t (*show)(struct dlm_cluster *, char *);
 130        ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
 131};
 132
 133static ssize_t cluster_cluster_name_read(struct dlm_cluster *cl, char *buf)
 134{
 135        return sprintf(buf, "%s\n", cl->cl_cluster_name);
 136}
 137
 138static ssize_t cluster_cluster_name_write(struct dlm_cluster *cl,
 139                                          const char *buf, size_t len)
 140{
 141        strlcpy(dlm_config.ci_cluster_name, buf,
 142                                sizeof(dlm_config.ci_cluster_name));
 143        strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
 144        return len;
 145}
 146
 147static struct cluster_attribute cluster_attr_cluster_name = {
 148        .attr   = { .ca_owner = THIS_MODULE,
 149                    .ca_name = "cluster_name",
 150                    .ca_mode = S_IRUGO | S_IWUSR },
 151        .show   = cluster_cluster_name_read,
 152        .store  = cluster_cluster_name_write,
 153};
 154
 155static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
 156                           int *info_field, int check_zero,
 157                           const char *buf, size_t len)
 158{
 159        unsigned int x;
 160
 161        if (!capable(CAP_SYS_ADMIN))
 162                return -EPERM;
 163
 164        x = simple_strtoul(buf, NULL, 0);
 165
 166        if (check_zero && !x)
 167                return -EINVAL;
 168
 169        *cl_field = x;
 170        *info_field = x;
 171
 172        return len;
 173}
 174
 175#define CLUSTER_ATTR(name, check_zero)                                        \
 176static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
 177{                                                                             \
 178        return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 179                           check_zero, buf, len);                             \
 180}                                                                             \
 181static ssize_t name##_read(struct dlm_cluster *cl, char *buf)                 \
 182{                                                                             \
 183        return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 184}                                                                             \
 185static struct cluster_attribute cluster_attr_##name =                         \
 186__CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
 187
 188CLUSTER_ATTR(tcp_port, 1);
 189CLUSTER_ATTR(buffer_size, 1);
 190CLUSTER_ATTR(rsbtbl_size, 1);
 191CLUSTER_ATTR(recover_timer, 1);
 192CLUSTER_ATTR(toss_secs, 1);
 193CLUSTER_ATTR(scan_secs, 1);
 194CLUSTER_ATTR(log_debug, 0);
 195CLUSTER_ATTR(protocol, 0);
 196CLUSTER_ATTR(timewarn_cs, 1);
 197CLUSTER_ATTR(waitwarn_us, 0);
 198CLUSTER_ATTR(new_rsb_count, 0);
 199CLUSTER_ATTR(recover_callbacks, 0);
 200
 201static struct configfs_attribute *cluster_attrs[] = {
 202        [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
 203        [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
 204        [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
 205        [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
 206        [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
 207        [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
 208        [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
 209        [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
 210        [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
 211        [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr,
 212        [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count.attr,
 213        [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks.attr,
 214        [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name.attr,
 215        NULL,
 216};
 217
 218enum {
 219        COMM_ATTR_NODEID = 0,
 220        COMM_ATTR_LOCAL,
 221        COMM_ATTR_ADDR,
 222        COMM_ATTR_ADDR_LIST,
 223};
 224
 225struct comm_attribute {
 226        struct configfs_attribute attr;
 227        ssize_t (*show)(struct dlm_comm *, char *);
 228        ssize_t (*store)(struct dlm_comm *, const char *, size_t);
 229};
 230
 231static struct comm_attribute comm_attr_nodeid = {
 232        .attr   = { .ca_owner = THIS_MODULE,
 233                    .ca_name = "nodeid",
 234                    .ca_mode = S_IRUGO | S_IWUSR },
 235        .show   = comm_nodeid_read,
 236        .store  = comm_nodeid_write,
 237};
 238
 239static struct comm_attribute comm_attr_local = {
 240        .attr   = { .ca_owner = THIS_MODULE,
 241                    .ca_name = "local",
 242                    .ca_mode = S_IRUGO | S_IWUSR },
 243        .show   = comm_local_read,
 244        .store  = comm_local_write,
 245};
 246
 247static struct comm_attribute comm_attr_addr = {
 248        .attr   = { .ca_owner = THIS_MODULE,
 249                    .ca_name = "addr",
 250                    .ca_mode = S_IWUSR },
 251        .store  = comm_addr_write,
 252};
 253
 254static struct comm_attribute comm_attr_addr_list = {
 255        .attr   = { .ca_owner = THIS_MODULE,
 256                    .ca_name = "addr_list",
 257                    .ca_mode = S_IRUGO },
 258        .show   = comm_addr_list_read,
 259};
 260
 261static struct configfs_attribute *comm_attrs[] = {
 262        [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
 263        [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
 264        [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
 265        [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list.attr,
 266        NULL,
 267};
 268
 269enum {
 270        NODE_ATTR_NODEID = 0,
 271        NODE_ATTR_WEIGHT,
 272};
 273
 274struct node_attribute {
 275        struct configfs_attribute attr;
 276        ssize_t (*show)(struct dlm_node *, char *);
 277        ssize_t (*store)(struct dlm_node *, const char *, size_t);
 278};
 279
 280static struct node_attribute node_attr_nodeid = {
 281        .attr   = { .ca_owner = THIS_MODULE,
 282                    .ca_name = "nodeid",
 283                    .ca_mode = S_IRUGO | S_IWUSR },
 284        .show   = node_nodeid_read,
 285        .store  = node_nodeid_write,
 286};
 287
 288static struct node_attribute node_attr_weight = {
 289        .attr   = { .ca_owner = THIS_MODULE,
 290                    .ca_name = "weight",
 291                    .ca_mode = S_IRUGO | S_IWUSR },
 292        .show   = node_weight_read,
 293        .store  = node_weight_write,
 294};
 295
 296static struct configfs_attribute *node_attrs[] = {
 297        [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
 298        [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
 299        NULL,
 300};
 301
 302struct dlm_clusters {
 303        struct configfs_subsystem subsys;
 304};
 305
 306struct dlm_spaces {
 307        struct config_group ss_group;
 308};
 309
 310struct dlm_space {
 311        struct config_group group;
 312        struct list_head members;
 313        struct mutex members_lock;
 314        int members_count;
 315};
 316
 317struct dlm_comms {
 318        struct config_group cs_group;
 319};
 320
 321struct dlm_comm {
 322        struct config_item item;
 323        int seq;
 324        int nodeid;
 325        int local;
 326        int addr_count;
 327        struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 328};
 329
 330struct dlm_nodes {
 331        struct config_group ns_group;
 332};
 333
 334struct dlm_node {
 335        struct config_item item;
 336        struct list_head list; /* space->members */
 337        int nodeid;
 338        int weight;
 339        int new;
 340        int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 341};
 342
 343static struct configfs_group_operations clusters_ops = {
 344        .make_group = make_cluster,
 345        .drop_item = drop_cluster,
 346};
 347
 348static struct configfs_item_operations cluster_ops = {
 349        .release = release_cluster,
 350        .show_attribute = show_cluster,
 351        .store_attribute = store_cluster,
 352};
 353
 354static struct configfs_group_operations spaces_ops = {
 355        .make_group = make_space,
 356        .drop_item = drop_space,
 357};
 358
 359static struct configfs_item_operations space_ops = {
 360        .release = release_space,
 361};
 362
 363static struct configfs_group_operations comms_ops = {
 364        .make_item = make_comm,
 365        .drop_item = drop_comm,
 366};
 367
 368static struct configfs_item_operations comm_ops = {
 369        .release = release_comm,
 370        .show_attribute = show_comm,
 371        .store_attribute = store_comm,
 372};
 373
 374static struct configfs_group_operations nodes_ops = {
 375        .make_item = make_node,
 376        .drop_item = drop_node,
 377};
 378
 379static struct configfs_item_operations node_ops = {
 380        .release = release_node,
 381        .show_attribute = show_node,
 382        .store_attribute = store_node,
 383};
 384
 385static struct config_item_type clusters_type = {
 386        .ct_group_ops = &clusters_ops,
 387        .ct_owner = THIS_MODULE,
 388};
 389
 390static struct config_item_type cluster_type = {
 391        .ct_item_ops = &cluster_ops,
 392        .ct_attrs = cluster_attrs,
 393        .ct_owner = THIS_MODULE,
 394};
 395
 396static struct config_item_type spaces_type = {
 397        .ct_group_ops = &spaces_ops,
 398        .ct_owner = THIS_MODULE,
 399};
 400
 401static struct config_item_type space_type = {
 402        .ct_item_ops = &space_ops,
 403        .ct_owner = THIS_MODULE,
 404};
 405
 406static struct config_item_type comms_type = {
 407        .ct_group_ops = &comms_ops,
 408        .ct_owner = THIS_MODULE,
 409};
 410
 411static struct config_item_type comm_type = {
 412        .ct_item_ops = &comm_ops,
 413        .ct_attrs = comm_attrs,
 414        .ct_owner = THIS_MODULE,
 415};
 416
 417static struct config_item_type nodes_type = {
 418        .ct_group_ops = &nodes_ops,
 419        .ct_owner = THIS_MODULE,
 420};
 421
 422static struct config_item_type node_type = {
 423        .ct_item_ops = &node_ops,
 424        .ct_attrs = node_attrs,
 425        .ct_owner = THIS_MODULE,
 426};
 427
 428static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
 429{
 430        return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
 431                   NULL;
 432}
 433
 434static struct dlm_space *config_item_to_space(struct config_item *i)
 435{
 436        return i ? container_of(to_config_group(i), struct dlm_space, group) :
 437                   NULL;
 438}
 439
 440static struct dlm_comm *config_item_to_comm(struct config_item *i)
 441{
 442        return i ? container_of(i, struct dlm_comm, item) : NULL;
 443}
 444
 445static struct dlm_node *config_item_to_node(struct config_item *i)
 446{
 447        return i ? container_of(i, struct dlm_node, item) : NULL;
 448}
 449
 450static struct config_group *make_cluster(struct config_group *g,
 451                                         const char *name)
 452{
 453        struct dlm_cluster *cl = NULL;
 454        struct dlm_spaces *sps = NULL;
 455        struct dlm_comms *cms = NULL;
 456        void *gps = NULL;
 457
 458        cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 459        gps = kcalloc(3, sizeof(struct config_group *), GFP_NOFS);
 460        sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 461        cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 462
 463        if (!cl || !gps || !sps || !cms)
 464                goto fail;
 465
 466        config_group_init_type_name(&cl->group, name, &cluster_type);
 467        config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 468        config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 469
 470        cl->group.default_groups = gps;
 471        cl->group.default_groups[0] = &sps->ss_group;
 472        cl->group.default_groups[1] = &cms->cs_group;
 473        cl->group.default_groups[2] = NULL;
 474
 475        cl->cl_tcp_port = dlm_config.ci_tcp_port;
 476        cl->cl_buffer_size = dlm_config.ci_buffer_size;
 477        cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 478        cl->cl_recover_timer = dlm_config.ci_recover_timer;
 479        cl->cl_toss_secs = dlm_config.ci_toss_secs;
 480        cl->cl_scan_secs = dlm_config.ci_scan_secs;
 481        cl->cl_log_debug = dlm_config.ci_log_debug;
 482        cl->cl_protocol = dlm_config.ci_protocol;
 483        cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 484        cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 485        cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 486        cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 487        memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 488               DLM_LOCKSPACE_LEN);
 489
 490        space_list = &sps->ss_group;
 491        comm_list = &cms->cs_group;
 492        return &cl->group;
 493
 494 fail:
 495        kfree(cl);
 496        kfree(gps);
 497        kfree(sps);
 498        kfree(cms);
 499        return ERR_PTR(-ENOMEM);
 500}
 501
 502static void drop_cluster(struct config_group *g, struct config_item *i)
 503{
 504        struct dlm_cluster *cl = config_item_to_cluster(i);
 505        struct config_item *tmp;
 506        int j;
 507
 508        for (j = 0; cl->group.default_groups[j]; j++) {
 509                tmp = &cl->group.default_groups[j]->cg_item;
 510                cl->group.default_groups[j] = NULL;
 511                config_item_put(tmp);
 512        }
 513
 514        space_list = NULL;
 515        comm_list = NULL;
 516
 517        config_item_put(i);
 518}
 519
 520static void release_cluster(struct config_item *i)
 521{
 522        struct dlm_cluster *cl = config_item_to_cluster(i);
 523        kfree(cl->group.default_groups);
 524        kfree(cl);
 525}
 526
 527static struct config_group *make_space(struct config_group *g, const char *name)
 528{
 529        struct dlm_space *sp = NULL;
 530        struct dlm_nodes *nds = NULL;
 531        void *gps = NULL;
 532
 533        sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 534        gps = kcalloc(2, sizeof(struct config_group *), GFP_NOFS);
 535        nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 536
 537        if (!sp || !gps || !nds)
 538                goto fail;
 539
 540        config_group_init_type_name(&sp->group, name, &space_type);
 541        config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 542
 543        sp->group.default_groups = gps;
 544        sp->group.default_groups[0] = &nds->ns_group;
 545        sp->group.default_groups[1] = NULL;
 546
 547        INIT_LIST_HEAD(&sp->members);
 548        mutex_init(&sp->members_lock);
 549        sp->members_count = 0;
 550        return &sp->group;
 551
 552 fail:
 553        kfree(sp);
 554        kfree(gps);
 555        kfree(nds);
 556        return ERR_PTR(-ENOMEM);
 557}
 558
 559static void drop_space(struct config_group *g, struct config_item *i)
 560{
 561        struct dlm_space *sp = config_item_to_space(i);
 562        struct config_item *tmp;
 563        int j;
 564
 565        /* assert list_empty(&sp->members) */
 566
 567        for (j = 0; sp->group.default_groups[j]; j++) {
 568                tmp = &sp->group.default_groups[j]->cg_item;
 569                sp->group.default_groups[j] = NULL;
 570                config_item_put(tmp);
 571        }
 572
 573        config_item_put(i);
 574}
 575
 576static void release_space(struct config_item *i)
 577{
 578        struct dlm_space *sp = config_item_to_space(i);
 579        kfree(sp->group.default_groups);
 580        kfree(sp);
 581}
 582
 583static struct config_item *make_comm(struct config_group *g, const char *name)
 584{
 585        struct dlm_comm *cm;
 586
 587        cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 588        if (!cm)
 589                return ERR_PTR(-ENOMEM);
 590
 591        config_item_init_type_name(&cm->item, name, &comm_type);
 592
 593        cm->seq = dlm_comm_count++;
 594        if (!cm->seq)
 595                cm->seq = dlm_comm_count++;
 596
 597        cm->nodeid = -1;
 598        cm->local = 0;
 599        cm->addr_count = 0;
 600        return &cm->item;
 601}
 602
 603static void drop_comm(struct config_group *g, struct config_item *i)
 604{
 605        struct dlm_comm *cm = config_item_to_comm(i);
 606        if (local_comm == cm)
 607                local_comm = NULL;
 608        dlm_lowcomms_close(cm->nodeid);
 609        while (cm->addr_count--)
 610                kfree(cm->addr[cm->addr_count]);
 611        config_item_put(i);
 612}
 613
 614static void release_comm(struct config_item *i)
 615{
 616        struct dlm_comm *cm = config_item_to_comm(i);
 617        kfree(cm);
 618}
 619
 620static struct config_item *make_node(struct config_group *g, const char *name)
 621{
 622        struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 623        struct dlm_node *nd;
 624
 625        nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 626        if (!nd)
 627                return ERR_PTR(-ENOMEM);
 628
 629        config_item_init_type_name(&nd->item, name, &node_type);
 630        nd->nodeid = -1;
 631        nd->weight = 1;  /* default weight of 1 if none is set */
 632        nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 633
 634        mutex_lock(&sp->members_lock);
 635        list_add(&nd->list, &sp->members);
 636        sp->members_count++;
 637        mutex_unlock(&sp->members_lock);
 638
 639        return &nd->item;
 640}
 641
 642static void drop_node(struct config_group *g, struct config_item *i)
 643{
 644        struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 645        struct dlm_node *nd = config_item_to_node(i);
 646
 647        mutex_lock(&sp->members_lock);
 648        list_del(&nd->list);
 649        sp->members_count--;
 650        mutex_unlock(&sp->members_lock);
 651
 652        config_item_put(i);
 653}
 654
 655static void release_node(struct config_item *i)
 656{
 657        struct dlm_node *nd = config_item_to_node(i);
 658        kfree(nd);
 659}
 660
 661static struct dlm_clusters clusters_root = {
 662        .subsys = {
 663                .su_group = {
 664                        .cg_item = {
 665                                .ci_namebuf = "dlm",
 666                                .ci_type = &clusters_type,
 667                        },
 668                },
 669        },
 670};
 671
 672int __init dlm_config_init(void)
 673{
 674        config_group_init(&clusters_root.subsys.su_group);
 675        mutex_init(&clusters_root.subsys.su_mutex);
 676        return configfs_register_subsystem(&clusters_root.subsys);
 677}
 678
 679void dlm_config_exit(void)
 680{
 681        configfs_unregister_subsystem(&clusters_root.subsys);
 682}
 683
 684/*
 685 * Functions for user space to read/write attributes
 686 */
 687
 688static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
 689                            char *buf)
 690{
 691        struct dlm_cluster *cl = config_item_to_cluster(i);
 692        struct cluster_attribute *cla =
 693                        container_of(a, struct cluster_attribute, attr);
 694        return cla->show ? cla->show(cl, buf) : 0;
 695}
 696
 697static ssize_t store_cluster(struct config_item *i,
 698                             struct configfs_attribute *a,
 699                             const char *buf, size_t len)
 700{
 701        struct dlm_cluster *cl = config_item_to_cluster(i);
 702        struct cluster_attribute *cla =
 703                container_of(a, struct cluster_attribute, attr);
 704        return cla->store ? cla->store(cl, buf, len) : -EINVAL;
 705}
 706
 707static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
 708                         char *buf)
 709{
 710        struct dlm_comm *cm = config_item_to_comm(i);
 711        struct comm_attribute *cma =
 712                        container_of(a, struct comm_attribute, attr);
 713        return cma->show ? cma->show(cm, buf) : 0;
 714}
 715
 716static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
 717                          const char *buf, size_t len)
 718{
 719        struct dlm_comm *cm = config_item_to_comm(i);
 720        struct comm_attribute *cma =
 721                container_of(a, struct comm_attribute, attr);
 722        return cma->store ? cma->store(cm, buf, len) : -EINVAL;
 723}
 724
 725static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf)
 726{
 727        return sprintf(buf, "%d\n", cm->nodeid);
 728}
 729
 730static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
 731                                 size_t len)
 732{
 733        cm->nodeid = simple_strtol(buf, NULL, 0);
 734        return len;
 735}
 736
 737static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
 738{
 739        return sprintf(buf, "%d\n", cm->local);
 740}
 741
 742static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
 743                                size_t len)
 744{
 745        cm->local= simple_strtol(buf, NULL, 0);
 746        if (cm->local && !local_comm)
 747                local_comm = cm;
 748        return len;
 749}
 750
 751static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
 752{
 753        struct sockaddr_storage *addr;
 754        int rv;
 755
 756        if (len != sizeof(struct sockaddr_storage))
 757                return -EINVAL;
 758
 759        if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 760                return -ENOSPC;
 761
 762        addr = kzalloc(sizeof(*addr), GFP_NOFS);
 763        if (!addr)
 764                return -ENOMEM;
 765
 766        memcpy(addr, buf, len);
 767
 768        rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
 769        if (rv) {
 770                kfree(addr);
 771                return rv;
 772        }
 773
 774        cm->addr[cm->addr_count++] = addr;
 775        return len;
 776}
 777
 778static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf)
 779{
 780        ssize_t s;
 781        ssize_t allowance;
 782        int i;
 783        struct sockaddr_storage *addr;
 784        struct sockaddr_in *addr_in;
 785        struct sockaddr_in6 *addr_in6;
 786        
 787        /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 788        char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 789        
 790
 791        /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 792        allowance = 4096;
 793        buf[0] = '\0';
 794
 795        for (i = 0; i < cm->addr_count; i++) {
 796                addr = cm->addr[i];
 797
 798                switch(addr->ss_family) {
 799                case AF_INET:
 800                        addr_in = (struct sockaddr_in *)addr;
 801                        s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 802                        break;
 803                case AF_INET6:
 804                        addr_in6 = (struct sockaddr_in6 *)addr;
 805                        s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 806                        break;
 807                default:
 808                        s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 809                        break;
 810                }
 811                allowance -= s;
 812                if (allowance >= 0)
 813                        strcat(buf, buf0);
 814                else {
 815                        allowance += s;
 816                        break;
 817                }
 818        }
 819        return 4096 - allowance;
 820}
 821
 822static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
 823                         char *buf)
 824{
 825        struct dlm_node *nd = config_item_to_node(i);
 826        struct node_attribute *nda =
 827                        container_of(a, struct node_attribute, attr);
 828        return nda->show ? nda->show(nd, buf) : 0;
 829}
 830
 831static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
 832                          const char *buf, size_t len)
 833{
 834        struct dlm_node *nd = config_item_to_node(i);
 835        struct node_attribute *nda =
 836                container_of(a, struct node_attribute, attr);
 837        return nda->store ? nda->store(nd, buf, len) : -EINVAL;
 838}
 839
 840static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
 841{
 842        return sprintf(buf, "%d\n", nd->nodeid);
 843}
 844
 845static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
 846                                 size_t len)
 847{
 848        uint32_t seq = 0;
 849        nd->nodeid = simple_strtol(buf, NULL, 0);
 850        dlm_comm_seq(nd->nodeid, &seq);
 851        nd->comm_seq = seq;
 852        return len;
 853}
 854
 855static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
 856{
 857        return sprintf(buf, "%d\n", nd->weight);
 858}
 859
 860static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
 861                                 size_t len)
 862{
 863        nd->weight = simple_strtol(buf, NULL, 0);
 864        return len;
 865}
 866
 867/*
 868 * Functions for the dlm to get the info that's been configured
 869 */
 870
 871static struct dlm_space *get_space(char *name)
 872{
 873        struct config_item *i;
 874
 875        if (!space_list)
 876                return NULL;
 877
 878        mutex_lock(&space_list->cg_subsys->su_mutex);
 879        i = config_group_find_item(space_list, name);
 880        mutex_unlock(&space_list->cg_subsys->su_mutex);
 881
 882        return config_item_to_space(i);
 883}
 884
 885static void put_space(struct dlm_space *sp)
 886{
 887        config_item_put(&sp->group.cg_item);
 888}
 889
 890static struct dlm_comm *get_comm(int nodeid)
 891{
 892        struct config_item *i;
 893        struct dlm_comm *cm = NULL;
 894        int found = 0;
 895
 896        if (!comm_list)
 897                return NULL;
 898
 899        mutex_lock(&clusters_root.subsys.su_mutex);
 900
 901        list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 902                cm = config_item_to_comm(i);
 903
 904                if (cm->nodeid != nodeid)
 905                        continue;
 906                found = 1;
 907                config_item_get(i);
 908                break;
 909        }
 910        mutex_unlock(&clusters_root.subsys.su_mutex);
 911
 912        if (!found)
 913                cm = NULL;
 914        return cm;
 915}
 916
 917static void put_comm(struct dlm_comm *cm)
 918{
 919        config_item_put(&cm->item);
 920}
 921
 922/* caller must free mem */
 923int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 924                     int *count_out)
 925{
 926        struct dlm_space *sp;
 927        struct dlm_node *nd;
 928        struct dlm_config_node *nodes, *node;
 929        int rv, count;
 930
 931        sp = get_space(lsname);
 932        if (!sp)
 933                return -EEXIST;
 934
 935        mutex_lock(&sp->members_lock);
 936        if (!sp->members_count) {
 937                rv = -EINVAL;
 938                printk(KERN_ERR "dlm: zero members_count\n");
 939                goto out;
 940        }
 941
 942        count = sp->members_count;
 943
 944        nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 945        if (!nodes) {
 946                rv = -ENOMEM;
 947                goto out;
 948        }
 949
 950        node = nodes;
 951        list_for_each_entry(nd, &sp->members, list) {
 952                node->nodeid = nd->nodeid;
 953                node->weight = nd->weight;
 954                node->new = nd->new;
 955                node->comm_seq = nd->comm_seq;
 956                node++;
 957
 958                nd->new = 0;
 959        }
 960
 961        *count_out = count;
 962        *nodes_out = nodes;
 963        rv = 0;
 964 out:
 965        mutex_unlock(&sp->members_lock);
 966        put_space(sp);
 967        return rv;
 968}
 969
 970int dlm_comm_seq(int nodeid, uint32_t *seq)
 971{
 972        struct dlm_comm *cm = get_comm(nodeid);
 973        if (!cm)
 974                return -EEXIST;
 975        *seq = cm->seq;
 976        put_comm(cm);
 977        return 0;
 978}
 979
 980int dlm_our_nodeid(void)
 981{
 982        return local_comm ? local_comm->nodeid : 0;
 983}
 984
 985/* num 0 is first addr, num 1 is second addr */
 986int dlm_our_addr(struct sockaddr_storage *addr, int num)
 987{
 988        if (!local_comm)
 989                return -1;
 990        if (num + 1 > local_comm->addr_count)
 991                return -1;
 992        memcpy(addr, local_comm->addr[num], sizeof(*addr));
 993        return 0;
 994}
 995
 996/* Config file defaults */
 997#define DEFAULT_TCP_PORT       21064
 998#define DEFAULT_BUFFER_SIZE     4096
 999#define DEFAULT_RSBTBL_SIZE     1024
1000#define DEFAULT_RECOVER_TIMER      5
1001#define DEFAULT_TOSS_SECS         10
1002#define DEFAULT_SCAN_SECS          5
1003#define DEFAULT_LOG_DEBUG          0
1004#define DEFAULT_PROTOCOL           0
1005#define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
1006#define DEFAULT_WAITWARN_US        0
1007#define DEFAULT_NEW_RSB_COUNT    128
1008#define DEFAULT_RECOVER_CALLBACKS  0
1009#define DEFAULT_CLUSTER_NAME      ""
1010
1011struct dlm_config_info dlm_config = {
1012        .ci_tcp_port = DEFAULT_TCP_PORT,
1013        .ci_buffer_size = DEFAULT_BUFFER_SIZE,
1014        .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
1015        .ci_recover_timer = DEFAULT_RECOVER_TIMER,
1016        .ci_toss_secs = DEFAULT_TOSS_SECS,
1017        .ci_scan_secs = DEFAULT_SCAN_SECS,
1018        .ci_log_debug = DEFAULT_LOG_DEBUG,
1019        .ci_protocol = DEFAULT_PROTOCOL,
1020        .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
1021        .ci_waitwarn_us = DEFAULT_WAITWARN_US,
1022        .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
1023        .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
1024        .ci_cluster_name = DEFAULT_CLUSTER_NAME
1025};
1026
1027
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.