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