linux/fs/ocfs2/dlm/dlmrecovery.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/* -*- mode: c; c-basic-offset: 8; -*-
   3 * vim: noexpandtab sw=8 ts=8 sts=0:
   4 *
   5 * dlmrecovery.c
   6 *
   7 * recovery stuff
   8 *
   9 * Copyright (C) 2004 Oracle.  All rights reserved.
  10 */
  11
  12
  13#include <linux/module.h>
  14#include <linux/fs.h>
  15#include <linux/types.h>
  16#include <linux/slab.h>
  17#include <linux/highmem.h>
  18#include <linux/init.h>
  19#include <linux/sysctl.h>
  20#include <linux/random.h>
  21#include <linux/blkdev.h>
  22#include <linux/socket.h>
  23#include <linux/inet.h>
  24#include <linux/timer.h>
  25#include <linux/kthread.h>
  26#include <linux/delay.h>
  27
  28
  29#include "../cluster/heartbeat.h"
  30#include "../cluster/nodemanager.h"
  31#include "../cluster/tcp.h"
  32
  33#include "dlmapi.h"
  34#include "dlmcommon.h"
  35#include "dlmdomain.h"
  36
  37#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_RECOVERY)
  38#include "../cluster/masklog.h"
  39
  40static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node);
  41
  42static int dlm_recovery_thread(void *data);
  43static int dlm_do_recovery(struct dlm_ctxt *dlm);
  44
  45static int dlm_pick_recovery_master(struct dlm_ctxt *dlm);
  46static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node);
  47static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node);
  48static int dlm_request_all_locks(struct dlm_ctxt *dlm,
  49                                 u8 request_from, u8 dead_node);
  50static void dlm_destroy_recovery_area(struct dlm_ctxt *dlm);
  51
  52static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource *res);
  53static void dlm_init_migratable_lockres(struct dlm_migratable_lockres *mres,
  54                                        const char *lockname, int namelen,
  55                                        int total_locks, u64 cookie,
  56                                        u8 flags, u8 master);
  57static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm,
  58                                    struct dlm_migratable_lockres *mres,
  59                                    u8 send_to,
  60                                    struct dlm_lock_resource *res,
  61                                    int total_locks);
  62static int dlm_process_recovery_data(struct dlm_ctxt *dlm,
  63                                     struct dlm_lock_resource *res,
  64                                     struct dlm_migratable_lockres *mres);
  65static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm);
  66static int dlm_send_all_done_msg(struct dlm_ctxt *dlm,
  67                                 u8 dead_node, u8 send_to);
  68static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node);
  69static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm,
  70                                        struct list_head *list, u8 dead_node);
  71static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
  72                                              u8 dead_node, u8 new_master);
  73static void dlm_reco_ast(void *astdata);
  74static void dlm_reco_bast(void *astdata, int blocked_type);
  75static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st);
  76static void dlm_request_all_locks_worker(struct dlm_work_item *item,
  77                                         void *data);
  78static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data);
  79static int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
  80                                      struct dlm_lock_resource *res,
  81                                      u8 *real_master);
  82
  83static u64 dlm_get_next_mig_cookie(void);
  84
  85static DEFINE_SPINLOCK(dlm_reco_state_lock);
  86static DEFINE_SPINLOCK(dlm_mig_cookie_lock);
  87static u64 dlm_mig_cookie = 1;
  88
  89static u64 dlm_get_next_mig_cookie(void)
  90{
  91        u64 c;
  92        spin_lock(&dlm_mig_cookie_lock);
  93        c = dlm_mig_cookie;
  94        if (dlm_mig_cookie == (~0ULL))
  95                dlm_mig_cookie = 1;
  96        else
  97                dlm_mig_cookie++;
  98        spin_unlock(&dlm_mig_cookie_lock);
  99        return c;
 100}
 101
 102static inline void dlm_set_reco_dead_node(struct dlm_ctxt *dlm,
 103                                          u8 dead_node)
 104{
 105        assert_spin_locked(&dlm->spinlock);
 106        if (dlm->reco.dead_node != dead_node)
 107                mlog(0, "%s: changing dead_node from %u to %u\n",
 108                     dlm->name, dlm->reco.dead_node, dead_node);
 109        dlm->reco.dead_node = dead_node;
 110}
 111
 112static inline void dlm_set_reco_master(struct dlm_ctxt *dlm,
 113                                       u8 master)
 114{
 115        assert_spin_locked(&dlm->spinlock);
 116        mlog(0, "%s: changing new_master from %u to %u\n",
 117             dlm->name, dlm->reco.new_master, master);
 118        dlm->reco.new_master = master;
 119}
 120
 121static inline void __dlm_reset_recovery(struct dlm_ctxt *dlm)
 122{
 123        assert_spin_locked(&dlm->spinlock);
 124        clear_bit(dlm->reco.dead_node, dlm->recovery_map);
 125        dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM);
 126        dlm_set_reco_master(dlm, O2NM_INVALID_NODE_NUM);
 127}
 128
 129static inline void dlm_reset_recovery(struct dlm_ctxt *dlm)
 130{
 131        spin_lock(&dlm->spinlock);
 132        __dlm_reset_recovery(dlm);
 133        spin_unlock(&dlm->spinlock);
 134}
 135
 136/* Worker function used during recovery. */
 137void dlm_dispatch_work(struct work_struct *work)
 138{
 139        struct dlm_ctxt *dlm =
 140                container_of(work, struct dlm_ctxt, dispatched_work);
 141        LIST_HEAD(tmp_list);
 142        struct dlm_work_item *item, *next;
 143        dlm_workfunc_t *workfunc;
 144        int tot=0;
 145
 146        spin_lock(&dlm->work_lock);
 147        list_splice_init(&dlm->work_list, &tmp_list);
 148        spin_unlock(&dlm->work_lock);
 149
 150        list_for_each_entry(item, &tmp_list, list) {
 151                tot++;
 152        }
 153        mlog(0, "%s: work thread has %d work items\n", dlm->name, tot);
 154
 155        list_for_each_entry_safe(item, next, &tmp_list, list) {
 156                workfunc = item->func;
 157                list_del_init(&item->list);
 158
 159                /* already have ref on dlm to avoid having
 160                 * it disappear.  just double-check. */
 161                BUG_ON(item->dlm != dlm);
 162
 163                /* this is allowed to sleep and
 164                 * call network stuff */
 165                workfunc(item, item->data);
 166
 167                dlm_put(dlm);
 168                kfree(item);
 169        }
 170}
 171
 172/*
 173 * RECOVERY THREAD
 174 */
 175
 176void dlm_kick_recovery_thread(struct dlm_ctxt *dlm)
 177{
 178        /* wake the recovery thread
 179         * this will wake the reco thread in one of three places
 180         * 1) sleeping with no recovery happening
 181         * 2) sleeping with recovery mastered elsewhere
 182         * 3) recovery mastered here, waiting on reco data */
 183
 184        wake_up(&dlm->dlm_reco_thread_wq);
 185}
 186
 187/* Launch the recovery thread */
 188int dlm_launch_recovery_thread(struct dlm_ctxt *dlm)
 189{
 190        mlog(0, "starting dlm recovery thread...\n");
 191
 192        dlm->dlm_reco_thread_task = kthread_run(dlm_recovery_thread, dlm,
 193                        "dlm_reco-%s", dlm->name);
 194        if (IS_ERR(dlm->dlm_reco_thread_task)) {
 195                mlog_errno(PTR_ERR(dlm->dlm_reco_thread_task));
 196                dlm->dlm_reco_thread_task = NULL;
 197                return -EINVAL;
 198        }
 199
 200        return 0;
 201}
 202
 203void dlm_complete_recovery_thread(struct dlm_ctxt *dlm)
 204{
 205        if (dlm->dlm_reco_thread_task) {
 206                mlog(0, "waiting for dlm recovery thread to exit\n");
 207                kthread_stop(dlm->dlm_reco_thread_task);
 208                dlm->dlm_reco_thread_task = NULL;
 209        }
 210}
 211
 212
 213
 214/*
 215 * this is lame, but here's how recovery works...
 216 * 1) all recovery threads cluster wide will work on recovering
 217 *    ONE node at a time
 218 * 2) negotiate who will take over all the locks for the dead node.
 219 *    thats right... ALL the locks.
 220 * 3) once a new master is chosen, everyone scans all locks
 221 *    and moves aside those mastered by the dead guy
 222 * 4) each of these locks should be locked until recovery is done
 223 * 5) the new master collects up all of secondary lock queue info
 224 *    one lock at a time, forcing each node to communicate back
 225 *    before continuing
 226 * 6) each secondary lock queue responds with the full known lock info
 227 * 7) once the new master has run all its locks, it sends a ALLDONE!
 228 *    message to everyone
 229 * 8) upon receiving this message, the secondary queue node unlocks
 230 *    and responds to the ALLDONE
 231 * 9) once the new master gets responses from everyone, he unlocks
 232 *    everything and recovery for this dead node is done
 233 *10) go back to 2) while there are still dead nodes
 234 *
 235 */
 236
 237static void dlm_print_reco_node_status(struct dlm_ctxt *dlm)
 238{
 239        struct dlm_reco_node_data *ndata;
 240        struct dlm_lock_resource *res;
 241
 242        mlog(ML_NOTICE, "%s(%d): recovery info, state=%s, dead=%u, master=%u\n",
 243             dlm->name, task_pid_nr(dlm->dlm_reco_thread_task),
 244             dlm->reco.state & DLM_RECO_STATE_ACTIVE ? "ACTIVE" : "inactive",
 245             dlm->reco.dead_node, dlm->reco.new_master);
 246
 247        list_for_each_entry(ndata, &dlm->reco.node_data, list) {
 248                char *st = "unknown";
 249                switch (ndata->state) {
 250                        case DLM_RECO_NODE_DATA_INIT:
 251                                st = "init";
 252                                break;
 253                        case DLM_RECO_NODE_DATA_REQUESTING:
 254                                st = "requesting";
 255                                break;
 256                        case DLM_RECO_NODE_DATA_DEAD:
 257                                st = "dead";
 258                                break;
 259                        case DLM_RECO_NODE_DATA_RECEIVING:
 260                                st = "receiving";
 261                                break;
 262                        case DLM_RECO_NODE_DATA_REQUESTED:
 263                                st = "requested";
 264                                break;
 265                        case DLM_RECO_NODE_DATA_DONE:
 266                                st = "done";
 267                                break;
 268                        case DLM_RECO_NODE_DATA_FINALIZE_SENT:
 269                                st = "finalize-sent";
 270                                break;
 271                        default:
 272                                st = "bad";
 273                                break;
 274                }
 275                mlog(ML_NOTICE, "%s: reco state, node %u, state=%s\n",
 276                     dlm->name, ndata->node_num, st);
 277        }
 278        list_for_each_entry(res, &dlm->reco.resources, recovering) {
 279                mlog(ML_NOTICE, "%s: lockres %.*s on recovering list\n",
 280                     dlm->name, res->lockname.len, res->lockname.name);
 281        }
 282}
 283
 284#define DLM_RECO_THREAD_TIMEOUT_MS (5 * 1000)
 285
 286static int dlm_recovery_thread(void *data)
 287{
 288        int status;
 289        struct dlm_ctxt *dlm = data;
 290        unsigned long timeout = msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS);
 291
 292        mlog(0, "dlm thread running for %s...\n", dlm->name);
 293
 294        while (!kthread_should_stop()) {
 295                if (dlm_domain_fully_joined(dlm)) {
 296                        status = dlm_do_recovery(dlm);
 297                        if (status == -EAGAIN) {
 298                                /* do not sleep, recheck immediately. */
 299                                continue;
 300                        }
 301                        if (status < 0)
 302                                mlog_errno(status);
 303                }
 304
 305                wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq,
 306                                                 kthread_should_stop(),
 307                                                 timeout);
 308        }
 309
 310        mlog(0, "quitting DLM recovery thread\n");
 311        return 0;
 312}
 313
 314/* returns true when the recovery master has contacted us */
 315static int dlm_reco_master_ready(struct dlm_ctxt *dlm)
 316{
 317        int ready;
 318        spin_lock(&dlm->spinlock);
 319        ready = (dlm->reco.new_master != O2NM_INVALID_NODE_NUM);
 320        spin_unlock(&dlm->spinlock);
 321        return ready;
 322}
 323
 324/* returns true if node is no longer in the domain
 325 * could be dead or just not joined */
 326int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node)
 327{
 328        int dead;
 329        spin_lock(&dlm->spinlock);
 330        dead = !test_bit(node, dlm->domain_map);
 331        spin_unlock(&dlm->spinlock);
 332        return dead;
 333}
 334
 335/* returns true if node is no longer in the domain
 336 * could be dead or just not joined */
 337static int dlm_is_node_recovered(struct dlm_ctxt *dlm, u8 node)
 338{
 339        int recovered;
 340        spin_lock(&dlm->spinlock);
 341        recovered = !test_bit(node, dlm->recovery_map);
 342        spin_unlock(&dlm->spinlock);
 343        return recovered;
 344}
 345
 346
 347void dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout)
 348{
 349        if (dlm_is_node_dead(dlm, node))
 350                return;
 351
 352        printk(KERN_NOTICE "o2dlm: Waiting on the death of node %u in "
 353               "domain %s\n", node, dlm->name);
 354
 355        if (timeout)
 356                wait_event_timeout(dlm->dlm_reco_thread_wq,
 357                                   dlm_is_node_dead(dlm, node),
 358                                   msecs_to_jiffies(timeout));
 359        else
 360                wait_event(dlm->dlm_reco_thread_wq,
 361                           dlm_is_node_dead(dlm, node));
 362}
 363
 364void dlm_wait_for_node_recovery(struct dlm_ctxt *dlm, u8 node, int timeout)
 365{
 366        if (dlm_is_node_recovered(dlm, node))
 367                return;
 368
 369        printk(KERN_NOTICE "o2dlm: Waiting on the recovery of node %u in "
 370               "domain %s\n", node, dlm->name);
 371
 372        if (timeout)
 373                wait_event_timeout(dlm->dlm_reco_thread_wq,
 374                                   dlm_is_node_recovered(dlm, node),
 375                                   msecs_to_jiffies(timeout));
 376        else
 377                wait_event(dlm->dlm_reco_thread_wq,
 378                           dlm_is_node_recovered(dlm, node));
 379}
 380
 381/* callers of the top-level api calls (dlmlock/dlmunlock) should
 382 * block on the dlm->reco.event when recovery is in progress.
 383 * the dlm recovery thread will set this state when it begins
 384 * recovering a dead node (as the new master or not) and clear
 385 * the state and wake as soon as all affected lock resources have
 386 * been marked with the RECOVERY flag */
 387static int dlm_in_recovery(struct dlm_ctxt *dlm)
 388{
 389        int in_recovery;
 390        spin_lock(&dlm->spinlock);
 391        in_recovery = !!(dlm->reco.state & DLM_RECO_STATE_ACTIVE);
 392        spin_unlock(&dlm->spinlock);
 393        return in_recovery;
 394}
 395
 396
 397void dlm_wait_for_recovery(struct dlm_ctxt *dlm)
 398{
 399        if (dlm_in_recovery(dlm)) {
 400                mlog(0, "%s: reco thread %d in recovery: "
 401                     "state=%d, master=%u, dead=%u\n",
 402                     dlm->name, task_pid_nr(dlm->dlm_reco_thread_task),
 403                     dlm->reco.state, dlm->reco.new_master,
 404                     dlm->reco.dead_node);
 405        }
 406        wait_event(dlm->reco.event, !dlm_in_recovery(dlm));
 407}
 408
 409static void dlm_begin_recovery(struct dlm_ctxt *dlm)
 410{
 411        assert_spin_locked(&dlm->spinlock);
 412        BUG_ON(dlm->reco.state & DLM_RECO_STATE_ACTIVE);
 413        printk(KERN_NOTICE "o2dlm: Begin recovery on domain %s for node %u\n",
 414               dlm->name, dlm->reco.dead_node);
 415        dlm->reco.state |= DLM_RECO_STATE_ACTIVE;
 416}
 417
 418static void dlm_end_recovery(struct dlm_ctxt *dlm)
 419{
 420        spin_lock(&dlm->spinlock);
 421        BUG_ON(!(dlm->reco.state & DLM_RECO_STATE_ACTIVE));
 422        dlm->reco.state &= ~DLM_RECO_STATE_ACTIVE;
 423        spin_unlock(&dlm->spinlock);
 424        printk(KERN_NOTICE "o2dlm: End recovery on domain %s\n", dlm->name);
 425        wake_up(&dlm->reco.event);
 426}
 427
 428static void dlm_print_recovery_master(struct dlm_ctxt *dlm)
 429{
 430        printk(KERN_NOTICE "o2dlm: Node %u (%s) is the Recovery Master for the "
 431               "dead node %u in domain %s\n", dlm->reco.new_master,
 432               (dlm->node_num == dlm->reco.new_master ? "me" : "he"),
 433               dlm->reco.dead_node, dlm->name);
 434}
 435
 436static int dlm_do_recovery(struct dlm_ctxt *dlm)
 437{
 438        int status = 0;
 439        int ret;
 440
 441        spin_lock(&dlm->spinlock);
 442
 443        if (dlm->migrate_done) {
 444                mlog(0, "%s: no need do recovery after migrating all "
 445                     "lock resources\n", dlm->name);
 446                spin_unlock(&dlm->spinlock);
 447                return 0;
 448        }
 449
 450        /* check to see if the new master has died */
 451        if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM &&
 452            test_bit(dlm->reco.new_master, dlm->recovery_map)) {
 453                mlog(0, "new master %u died while recovering %u!\n",
 454                     dlm->reco.new_master, dlm->reco.dead_node);
 455                /* unset the new_master, leave dead_node */
 456                dlm_set_reco_master(dlm, O2NM_INVALID_NODE_NUM);
 457        }
 458
 459        /* select a target to recover */
 460        if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) {
 461                int bit;
 462
 463                bit = find_next_bit (dlm->recovery_map, O2NM_MAX_NODES, 0);
 464                if (bit >= O2NM_MAX_NODES || bit < 0)
 465                        dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM);
 466                else
 467                        dlm_set_reco_dead_node(dlm, bit);
 468        } else if (!test_bit(dlm->reco.dead_node, dlm->recovery_map)) {
 469                /* BUG? */
 470                mlog(ML_ERROR, "dead_node %u no longer in recovery map!\n",
 471                     dlm->reco.dead_node);
 472                dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM);
 473        }
 474
 475        if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) {
 476                // mlog(0, "nothing to recover!  sleeping now!\n");
 477                spin_unlock(&dlm->spinlock);
 478                /* return to main thread loop and sleep. */
 479                return 0;
 480        }
 481        mlog(0, "%s(%d):recovery thread found node %u in the recovery map!\n",
 482             dlm->name, task_pid_nr(dlm->dlm_reco_thread_task),
 483             dlm->reco.dead_node);
 484
 485        /* take write barrier */
 486        /* (stops the list reshuffling thread, proxy ast handling) */
 487        dlm_begin_recovery(dlm);
 488
 489        spin_unlock(&dlm->spinlock);
 490
 491        if (dlm->reco.new_master == dlm->node_num)
 492                goto master_here;
 493
 494        if (dlm->reco.new_master == O2NM_INVALID_NODE_NUM) {
 495                /* choose a new master, returns 0 if this node
 496                 * is the master, -EEXIST if it's another node.
 497                 * this does not return until a new master is chosen
 498                 * or recovery completes entirely. */
 499                ret = dlm_pick_recovery_master(dlm);
 500                if (!ret) {
 501                        /* already notified everyone.  go. */
 502                        goto master_here;
 503                }
 504                mlog(0, "another node will master this recovery session.\n");
 505        }
 506
 507        dlm_print_recovery_master(dlm);
 508
 509        /* it is safe to start everything back up here
 510         * because all of the dead node's lock resources
 511         * have been marked as in-recovery */
 512        dlm_end_recovery(dlm);
 513
 514        /* sleep out in main dlm_recovery_thread loop. */
 515        return 0;
 516
 517master_here:
 518        dlm_print_recovery_master(dlm);
 519
 520        status = dlm_remaster_locks(dlm, dlm->reco.dead_node);
 521        if (status < 0) {
 522                /* we should never hit this anymore */
 523                mlog(ML_ERROR, "%s: Error %d remastering locks for node %u, "
 524                     "retrying.\n", dlm->name, status, dlm->reco.dead_node);
 525                /* yield a bit to allow any final network messages
 526                 * to get handled on remaining nodes */
 527                msleep(100);
 528        } else {
 529                /* success!  see if any other nodes need recovery */
 530                mlog(0, "DONE mastering recovery of %s:%u here(this=%u)!\n",
 531                     dlm->name, dlm->reco.dead_node, dlm->node_num);
 532                spin_lock(&dlm->spinlock);
 533                __dlm_reset_recovery(dlm);
 534                dlm->reco.state &= ~DLM_RECO_STATE_FINALIZE;
 535                spin_unlock(&dlm->spinlock);
 536        }
 537        dlm_end_recovery(dlm);
 538
 539        /* continue and look for another dead node */
 540        return -EAGAIN;
 541}
 542
 543static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
 544{
 545        int status = 0;
 546        struct dlm_reco_node_data *ndata;
 547        int all_nodes_done;
 548        int destroy = 0;
 549        int pass = 0;
 550
 551        do {
 552                /* we have become recovery master.  there is no escaping
 553                 * this, so just keep trying until we get it. */
 554                status = dlm_init_recovery_area(dlm, dead_node);
 555                if (status < 0) {
 556                        mlog(ML_ERROR, "%s: failed to alloc recovery area, "
 557                             "retrying\n", dlm->name);
 558                        msleep(1000);
 559                }
 560        } while (status != 0);
 561
 562        /* safe to access the node data list without a lock, since this
 563         * process is the only one to change the list */
 564        list_for_each_entry(ndata, &dlm->reco.node_data, list) {
 565                BUG_ON(ndata->state != DLM_RECO_NODE_DATA_INIT);
 566                ndata->state = DLM_RECO_NODE_DATA_REQUESTING;
 567
 568                mlog(0, "%s: Requesting lock info from node %u\n", dlm->name,
 569                     ndata->node_num);
 570
 571                if (ndata->node_num == dlm->node_num) {
 572                        ndata->state = DLM_RECO_NODE_DATA_DONE;
 573                        continue;
 574                }
 575
 576                do {
 577                        status = dlm_request_all_locks(dlm, ndata->node_num,
 578                                                       dead_node);
 579                        if (status < 0) {
 580                                mlog_errno(status);
 581                                if (dlm_is_host_down(status)) {
 582                                        /* node died, ignore it for recovery */
 583                                        status = 0;
 584                                        ndata->state = DLM_RECO_NODE_DATA_DEAD;
 585                                        /* wait for the domain map to catch up
 586                                         * with the network state. */
 587                                        wait_event_timeout(dlm->dlm_reco_thread_wq,
 588                                                           dlm_is_node_dead(dlm,
 589                                                                ndata->node_num),
 590                                                           msecs_to_jiffies(1000));
 591                                        mlog(0, "waited 1 sec for %u, "
 592                                             "dead? %s\n", ndata->node_num,
 593                                             dlm_is_node_dead(dlm, ndata->node_num) ?
 594                                             "yes" : "no");
 595                                } else {
 596                                        /* -ENOMEM on the other node */
 597                                        mlog(0, "%s: node %u returned "
 598                                             "%d during recovery, retrying "
 599                                             "after a short wait\n",
 600                                             dlm->name, ndata->node_num,
 601                                             status);
 602                                        msleep(100);
 603                                }
 604                        }
 605                } while (status != 0);
 606
 607                spin_lock(&dlm_reco_state_lock);
 608                switch (ndata->state) {
 609                        case DLM_RECO_NODE_DATA_INIT:
 610                        case DLM_RECO_NODE_DATA_FINALIZE_SENT:
 611                        case DLM_RECO_NODE_DATA_REQUESTED:
 612                                BUG();
 613                                break;
 614                        case DLM_RECO_NODE_DATA_DEAD:
 615                                mlog(0, "node %u died after requesting "
 616                                     "recovery info for node %u\n",
 617                                     ndata->node_num, dead_node);
 618                                /* fine.  don't need this node's info.
 619                                 * continue without it. */
 620                                break;
 621                        case DLM_RECO_NODE_DATA_REQUESTING:
 622                                ndata->state = DLM_RECO_NODE_DATA_REQUESTED;
 623                                mlog(0, "now receiving recovery data from "
 624                                     "node %u for dead node %u\n",
 625                                     ndata->node_num, dead_node);
 626                                break;
 627                        case DLM_RECO_NODE_DATA_RECEIVING:
 628                                mlog(0, "already receiving recovery data from "
 629                                     "node %u for dead node %u\n",
 630                                     ndata->node_num, dead_node);
 631                                break;
 632                        case DLM_RECO_NODE_DATA_DONE:
 633                                mlog(0, "already DONE receiving recovery data "
 634                                     "from node %u for dead node %u\n",
 635                                     ndata->node_num, dead_node);
 636                                break;
 637                }
 638                spin_unlock(&dlm_reco_state_lock);
 639        }
 640
 641        mlog(0, "%s: Done requesting all lock info\n", dlm->name);
 642
 643        /* nodes should be sending reco data now
 644         * just need to wait */
 645
 646        while (1) {
 647                /* check all the nodes now to see if we are
 648                 * done, or if anyone died */
 649                all_nodes_done = 1;
 650                spin_lock(&dlm_reco_state_lock);
 651                list_for_each_entry(ndata, &dlm->reco.node_data, list) {
 652                        mlog(0, "checking recovery state of node %u\n",
 653                             ndata->node_num);
 654                        switch (ndata->state) {
 655                                case DLM_RECO_NODE_DATA_INIT:
 656                                case DLM_RECO_NODE_DATA_REQUESTING:
 657                                        mlog(ML_ERROR, "bad ndata state for "
 658                                             "node %u: state=%d\n",
 659                                             ndata->node_num, ndata->state);
 660                                        BUG();
 661                                        break;
 662                                case DLM_RECO_NODE_DATA_DEAD:
 663                                        mlog(0, "node %u died after "
 664                                             "requesting recovery info for "
 665                                             "node %u\n", ndata->node_num,
 666                                             dead_node);
 667                                        break;
 668                                case DLM_RECO_NODE_DATA_RECEIVING:
 669                                case DLM_RECO_NODE_DATA_REQUESTED:
 670                                        mlog(0, "%s: node %u still in state %s\n",
 671                                             dlm->name, ndata->node_num,
 672                                             ndata->state==DLM_RECO_NODE_DATA_RECEIVING ?
 673                                             "receiving" : "requested");
 674                                        all_nodes_done = 0;
 675                                        break;
 676                                case DLM_RECO_NODE_DATA_DONE:
 677                                        mlog(0, "%s: node %u state is done\n",
 678                                             dlm->name, ndata->node_num);
 679                                        break;
 680                                case DLM_RECO_NODE_DATA_FINALIZE_SENT:
 681                                        mlog(0, "%s: node %u state is finalize\n",
 682                                             dlm->name, ndata->node_num);
 683                                        break;
 684                        }
 685                }
 686                spin_unlock(&dlm_reco_state_lock);
 687
 688                mlog(0, "pass #%d, all_nodes_done?: %s\n", ++pass,
 689                     all_nodes_done?"yes":"no");
 690                if (all_nodes_done) {
 691                        int ret;
 692
 693                        /* Set this flag on recovery master to avoid
 694                         * a new recovery for another dead node start
 695                         * before the recovery is not done. That may
 696                         * cause recovery hung.*/
 697                        spin_lock(&dlm->spinlock);
 698                        dlm->reco.state |= DLM_RECO_STATE_FINALIZE;
 699                        spin_unlock(&dlm->spinlock);
 700
 701                        /* all nodes are now in DLM_RECO_NODE_DATA_DONE state
 702                         * just send a finalize message to everyone and
 703                         * clean up */
 704                        mlog(0, "all nodes are done! send finalize\n");
 705                        ret = dlm_send_finalize_reco_message(dlm);
 706                        if (ret < 0)
 707                                mlog_errno(ret);
 708
 709                        spin_lock(&dlm->spinlock);
 710                        dlm_finish_local_lockres_recovery(dlm, dead_node,
 711                                                          dlm->node_num);
 712                        spin_unlock(&dlm->spinlock);
 713                        mlog(0, "should be done with recovery!\n");
 714
 715                        mlog(0, "finishing recovery of %s at %lu, "
 716                             "dead=%u, this=%u, new=%u\n", dlm->name,
 717                             jiffies, dlm->reco.dead_node,
 718                             dlm->node_num, dlm->reco.new_master);
 719                        destroy = 1;
 720                        status = 0;
 721                        /* rescan everything marked dirty along the way */
 722                        dlm_kick_thread(dlm, NULL);
 723                        break;
 724                }
 725                /* wait to be signalled, with periodic timeout
 726                 * to check for node death */
 727                wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq,
 728                                         kthread_should_stop(),
 729                                         msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS));
 730
 731        }
 732
 733        if (destroy)
 734                dlm_destroy_recovery_area(dlm);
 735
 736        return status;
 737}
 738
 739static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node)
 740{
 741        int num=0;
 742        struct dlm_reco_node_data *ndata;
 743
 744        spin_lock(&dlm->spinlock);
 745        memcpy(dlm->reco.node_map, dlm->domain_map, sizeof(dlm->domain_map));
 746        /* nodes can only be removed (by dying) after dropping
 747         * this lock, and death will be trapped later, so this should do */
 748        spin_unlock(&dlm->spinlock);
 749
 750        while (1) {
 751                num = find_next_bit (dlm->reco.node_map, O2NM_MAX_NODES, num);
 752                if (num >= O2NM_MAX_NODES) {
 753                        break;
 754                }
 755                BUG_ON(num == dead_node);
 756
 757                ndata = kzalloc(sizeof(*ndata), GFP_NOFS);
 758                if (!ndata) {
 759                        dlm_destroy_recovery_area(dlm);
 760                        return -ENOMEM;
 761                }
 762                ndata->node_num = num;
 763                ndata->state = DLM_RECO_NODE_DATA_INIT;
 764                spin_lock(&dlm_reco_state_lock);
 765                list_add_tail(&ndata->list, &dlm->reco.node_data);
 766                spin_unlock(&dlm_reco_state_lock);
 767                num++;
 768        }
 769
 770        return 0;
 771}
 772
 773static void dlm_destroy_recovery_area(struct dlm_ctxt *dlm)
 774{
 775        struct dlm_reco_node_data *ndata, *next;
 776        LIST_HEAD(tmplist);
 777
 778        spin_lock(&dlm_reco_state_lock);
 779        list_splice_init(&dlm->reco.node_data, &tmplist);
 780        spin_unlock(&dlm_reco_state_lock);
 781
 782        list_for_each_entry_safe(ndata, next, &tmplist, list) {
 783                list_del_init(&ndata->list);
 784                kfree(ndata);
 785        }
 786}
 787
 788static int dlm_request_all_locks(struct dlm_ctxt *dlm, u8 request_from,
 789                                 u8 dead_node)
 790{
 791        struct dlm_lock_request lr;
 792        int ret;
 793        int status;
 794
 795        mlog(0, "\n");
 796
 797
 798        mlog(0, "dlm_request_all_locks: dead node is %u, sending request "
 799                  "to %u\n", dead_node, request_from);
 800
 801        memset(&lr, 0, sizeof(lr));
 802        lr.node_idx = dlm->node_num;
 803        lr.dead_node = dead_node;
 804
 805        // send message
 806        ret = o2net_send_message(DLM_LOCK_REQUEST_MSG, dlm->key,
 807                                 &lr, sizeof(lr), request_from, &status);
 808
 809        /* negative status is handled by caller */
 810        if (ret < 0)
 811                mlog(ML_ERROR, "%s: Error %d send LOCK_REQUEST to node %u "
 812                     "to recover dead node %u\n", dlm->name, ret,
 813                     request_from, dead_node);
 814        else
 815                ret = status;
 816        // return from here, then
 817        // sleep until all received or error
 818        return ret;
 819
 820}
 821
 822int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data,
 823                                  void **ret_data)
 824{
 825        struct dlm_ctxt *dlm = data;
 826        struct dlm_lock_request *lr = (struct dlm_lock_request *)msg->buf;
 827        char *buf = NULL;
 828        struct dlm_work_item *item = NULL;
 829
 830        if (!dlm_grab(dlm))
 831                return -EINVAL;
 832
 833        if (lr->dead_node != dlm->reco.dead_node) {
 834                mlog(ML_ERROR, "%s: node %u sent dead_node=%u, but local "
 835                     "dead_node is %u\n", dlm->name, lr->node_idx,
 836                     lr->dead_node, dlm->reco.dead_node);
 837                dlm_print_reco_node_status(dlm);
 838                /* this is a hack */
 839                dlm_put(dlm);
 840                return -ENOMEM;
 841        }
 842        BUG_ON(lr->dead_node != dlm->reco.dead_node);
 843
 844        item = kzalloc(sizeof(*item), GFP_NOFS);
 845        if (!item) {
 846                dlm_put(dlm);
 847                return -ENOMEM;
 848        }
 849
 850        /* this will get freed by dlm_request_all_locks_worker */
 851        buf = (char *) __get_free_page(GFP_NOFS);
 852        if (!buf) {
 853                kfree(item);
 854                dlm_put(dlm);
 855                return -ENOMEM;
 856        }
 857
 858        /* queue up work for dlm_request_all_locks_worker */
 859        dlm_grab(dlm);  /* get an extra ref for the work item */
 860        dlm_init_work_item(dlm, item, dlm_request_all_locks_worker, buf);
 861        item->u.ral.reco_master = lr->node_idx;
 862        item->u.ral.dead_node = lr->dead_node;
 863        spin_lock(&dlm->work_lock);
 864        list_add_tail(&item->list, &dlm->work_list);
 865        spin_unlock(&dlm->work_lock);
 866        queue_work(dlm->dlm_worker, &dlm->dispatched_work);
 867
 868        dlm_put(dlm);
 869        return 0;
 870}
 871
 872static void dlm_request_all_locks_worker(struct dlm_work_item *item, void *data)
 873{
 874        struct dlm_migratable_lockres *mres;
 875        struct dlm_lock_resource *res;
 876        struct dlm_ctxt *dlm;
 877        LIST_HEAD(resources);
 878        int ret;
 879        u8 dead_node, reco_master;
 880        int skip_all_done = 0;
 881
 882        dlm = item->dlm;
 883        dead_node = item->u.ral.dead_node;
 884        reco_master = item->u.ral.reco_master;
 885        mres = (struct dlm_migratable_lockres *)data;
 886
 887        mlog(0, "%s: recovery worker started, dead=%u, master=%u\n",
 888             dlm->name, dead_node, reco_master);
 889
 890        if (dead_node != dlm->reco.dead_node ||
 891            reco_master != dlm->reco.new_master) {
 892                /* worker could have been created before the recovery master
 893                 * died.  if so, do not continue, but do not error. */
 894                if (dlm->reco.new_master == O2NM_INVALID_NODE_NUM) {
 895                        mlog(ML_NOTICE, "%s: will not send recovery state, "
 896                             "recovery master %u died, thread=(dead=%u,mas=%u)"
 897                             " current=(dead=%u,mas=%u)\n", dlm->name,
 898                             reco_master, dead_node, reco_master,
 899                             dlm->reco.dead_node, dlm->reco.new_master);
 900                } else {
 901                        mlog(ML_NOTICE, "%s: reco state invalid: reco(dead=%u, "
 902                             "master=%u), request(dead=%u, master=%u)\n",
 903                             dlm->name, dlm->reco.dead_node,
 904                             dlm->reco.new_master, dead_node, reco_master);
 905                }
 906                goto leave;
 907        }
 908
 909        /* lock resources should have already been moved to the
 910         * dlm->reco.resources list.  now move items from that list
 911         * to a temp list if the dead owner matches.  note that the
 912         * whole cluster recovers only one node at a time, so we
 913         * can safely move UNKNOWN lock resources for each recovery
 914         * session. */
 915        dlm_move_reco_locks_to_list(dlm, &resources, dead_node);
 916
 917        /* now we can begin blasting lockreses without the dlm lock */
 918
 919        /* any errors returned will be due to the new_master dying,
 920         * the dlm_reco_thread should detect this */
 921        list_for_each_entry(res, &resources, recovering) {
 922                ret = dlm_send_one_lockres(dlm, res, mres, reco_master,
 923                                        DLM_MRES_RECOVERY);
 924                if (ret < 0) {
 925                        mlog(ML_ERROR, "%s: node %u went down while sending "
 926                             "recovery state for dead node %u, ret=%d\n", dlm->name,
 927                             reco_master, dead_node, ret);
 928                        skip_all_done = 1;
 929                        break;
 930                }
 931        }
 932
 933        /* move the resources back to the list */
 934        spin_lock(&dlm->spinlock);
 935        list_splice_init(&resources, &dlm->reco.resources);
 936        spin_unlock(&dlm->spinlock);
 937
 938        if (!skip_all_done) {
 939                ret = dlm_send_all_done_msg(dlm, dead_node, reco_master);
 940                if (ret < 0) {
 941                        mlog(ML_ERROR, "%s: node %u went down while sending "
 942                             "recovery all-done for dead node %u, ret=%d\n",
 943                             dlm->name, reco_master, dead_node, ret);
 944                }
 945        }
 946leave:
 947        free_page((unsigned long)data);
 948}
 949
 950
 951static int dlm_send_all_done_msg(struct dlm_ctxt *dlm, u8 dead_node, u8 send_to)
 952{
 953        int ret, tmpret;
 954        struct dlm_reco_data_done done_msg;
 955
 956        memset(&done_msg, 0, sizeof(done_msg));
 957        done_msg.node_idx = dlm->node_num;
 958        done_msg.dead_node = dead_node;
 959        mlog(0, "sending DATA DONE message to %u, "
 960             "my node=%u, dead node=%u\n", send_to, done_msg.node_idx,
 961             done_msg.dead_node);
 962
 963        ret = o2net_send_message(DLM_RECO_DATA_DONE_MSG, dlm->key, &done_msg,
 964                                 sizeof(done_msg), send_to, &tmpret);
 965        if (ret < 0) {
 966                mlog(ML_ERROR, "%s: Error %d send RECO_DATA_DONE to node %u "
 967                     "to recover dead node %u\n", dlm->name, ret, send_to,
 968                     dead_node);
 969                if (!dlm_is_host_down(ret)) {
 970                        BUG();
 971                }
 972        } else
 973                ret = tmpret;
 974        return ret;
 975}
 976
 977
 978int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data,
 979                               void **ret_data)
 980{
 981        struct dlm_ctxt *dlm = data;
 982        struct dlm_reco_data_done *done = (struct dlm_reco_data_done *)msg->buf;
 983        struct dlm_reco_node_data *ndata = NULL;
 984        int ret = -EINVAL;
 985
 986        if (!dlm_grab(dlm))
 987                return -EINVAL;
 988
 989        mlog(0, "got DATA DONE: dead_node=%u, reco.dead_node=%u, "
 990             "node_idx=%u, this node=%u\n", done->dead_node,
 991             dlm->reco.dead_node, done->node_idx, dlm->node_num);
 992
 993        mlog_bug_on_msg((done->dead_node != dlm->reco.dead_node),
 994                        "Got DATA DONE: dead_node=%u, reco.dead_node=%u, "
 995                        "node_idx=%u, this node=%u\n", done->dead_node,
 996                        dlm->reco.dead_node, done->node_idx, dlm->node_num);
 997
 998        spin_lock(&dlm_reco_state_lock);
 999        list_for_each_entry(ndata, &dlm->reco.node_data, list) {
1000                if (ndata->node_num != done->node_idx)
1001                        continue;
1002
1003                switch (ndata->state) {
1004                        /* should have moved beyond INIT but not to FINALIZE yet */
1005                        case DLM_RECO_NODE_DATA_INIT:
1006                        case DLM_RECO_NODE_DATA_DEAD:
1007                        case DLM_RECO_NODE_DATA_FINALIZE_SENT:
1008                                mlog(ML_ERROR, "bad ndata state for node %u:"
1009                                     " state=%d\n", ndata->node_num,
1010                                     ndata->state);
1011                                BUG();
1012                                break;
1013                        /* these states are possible at this point, anywhere along
1014                         * the line of recovery */
1015                        case DLM_RECO_NODE_DATA_DONE:
1016                        case DLM_RECO_NODE_DATA_RECEIVING:
1017                        case DLM_RECO_NODE_DATA_REQUESTED:
1018                        case DLM_RECO_NODE_DATA_REQUESTING:
1019                                mlog(0, "node %u is DONE sending "
1020                                          "recovery data!\n",
1021                                          ndata->node_num);
1022
1023                                ndata->state = DLM_RECO_NODE_DATA_DONE;
1024                                ret = 0;
1025                                break;
1026                }
1027        }
1028        spin_unlock(&dlm_reco_state_lock);
1029
1030        /* wake the recovery thread, some node is done */
1031        if (!ret)
1032                dlm_kick_recovery_thread(dlm);
1033
1034        if (ret < 0)
1035                mlog(ML_ERROR, "failed to find recovery node data for node "
1036                     "%u\n", done->node_idx);
1037        dlm_put(dlm);
1038
1039        mlog(0, "leaving reco data done handler, ret=%d\n", ret);
1040        return ret;
1041}
1042
1043static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm,
1044                                        struct list_head *list,
1045                                        u8 dead_node)
1046{
1047        struct dlm_lock_resource *res, *next;
1048        struct dlm_lock *lock;
1049
1050        spin_lock(&dlm->spinlock);
1051        list_for_each_entry_safe(res, next, &dlm->reco.resources, recovering) {
1052                /* always prune any $RECOVERY entries for dead nodes,
1053                 * otherwise hangs can occur during later recovery */
1054                if (dlm_is_recovery_lock(res->lockname.name,
1055                                         res->lockname.len)) {
1056                        spin_lock(&res->spinlock);
1057                        list_for_each_entry(lock, &res->granted, list) {
1058                                if (lock->ml.node == dead_node) {
1059                                        mlog(0, "AHA! there was "
1060                                             "a $RECOVERY lock for dead "
1061                                             "node %u (%s)!\n",
1062                                             dead_node, dlm->name);
1063                                        list_del_init(&lock->list);
1064                                        dlm_lock_put(lock);
1065                                        /* Can't schedule DLM_UNLOCK_FREE_LOCK
1066                                         * - do manually */
1067                                        dlm_lock_put(lock);
1068                                        break;
1069                                }
1070                        }
1071                        spin_unlock(&res->spinlock);
1072                        continue;
1073                }
1074
1075                if (res->owner == dead_node) {
1076                        mlog(0, "found lockres owned by dead node while "
1077                                  "doing recovery for node %u. sending it.\n",
1078                                  dead_node);
1079                        list_move_tail(&res->recovering, list);
1080                } else if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) {
1081                        mlog(0, "found UNKNOWN owner while doing recovery "
1082                                  "for node %u. sending it.\n", dead_node);
1083                        list_move_tail(&res->recovering, list);
1084                }
1085        }
1086        spin_unlock(&dlm->spinlock);
1087}
1088
1089static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource *res)
1090{
1091        int total_locks = 0;
1092        struct list_head *iter, *queue = &res->granted;
1093        int i;
1094
1095        for (i=0; i<3; i++) {
1096                list_for_each(iter, queue)
1097                        total_locks++;
1098                queue++;
1099        }
1100        return total_locks;
1101}
1102
1103
1104static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm,
1105                                      struct dlm_migratable_lockres *mres,
1106                                      u8 send_to,
1107                                      struct dlm_lock_resource *res,
1108                                      int total_locks)
1109{
1110        u64 mig_cookie = be64_to_cpu(mres->mig_cookie);
1111        int mres_total_locks = be32_to_cpu(mres->total_locks);
1112        int ret = 0, status = 0;
1113        u8 orig_flags = mres->flags,
1114           orig_master = mres->master;
1115
1116        BUG_ON(mres->num_locks > DLM_MAX_MIGRATABLE_LOCKS);
1117        if (!mres->num_locks)
1118                return 0;
1119
1120        /* add an all-done flag if we reached the last lock */
1121        orig_flags = mres->flags;
1122        BUG_ON(total_locks > mres_total_locks);
1123        if (total_locks == mres_total_locks)
1124                mres->flags |= DLM_MRES_ALL_DONE;
1125
1126        mlog(0, "%s:%.*s: sending mig lockres (%s) to %u\n",
1127             dlm->name, res->lockname.len, res->lockname.name,
1128             orig_flags & DLM_MRES_MIGRATION ? "migration" : "recovery",
1129             send_to);
1130
1131        /* send it */
1132        ret = o2net_send_message(DLM_MIG_LOCKRES_MSG, dlm->key, mres,
1133                                 struct_size(mres, ml, mres->num_locks),
1134                                 send_to, &status);
1135        if (ret < 0) {
1136                /* XXX: negative status is not handled.
1137                 * this will end up killing this node. */
1138                mlog(ML_ERROR, "%s: res %.*s, Error %d send MIG_LOCKRES to "
1139                     "node %u (%s)\n", dlm->name, mres->lockname_len,
1140                     mres->lockname, ret, send_to,
1141                     (orig_flags & DLM_MRES_MIGRATION ?
1142                      "migration" : "recovery"));
1143        } else {
1144                /* might get an -ENOMEM back here */
1145                ret = status;
1146                if (ret < 0) {
1147                        mlog_errno(ret);
1148
1149                        if (ret == -EFAULT) {
1150                                mlog(ML_ERROR, "node %u told me to kill "
1151                                     "myself!\n", send_to);
1152                                BUG();
1153                        }
1154                }
1155        }
1156
1157        /* zero and reinit the message buffer */
1158        dlm_init_migratable_lockres(mres, res->lockname.name,
1159                                    res->lockname.len, mres_total_locks,
1160                                    mig_cookie, orig_flags, orig_master);
1161        return ret;
1162}
1163
1164static void dlm_init_migratable_lockres(struct dlm_migratable_lockres *mres,
1165                                        const char *lockname, int namelen,
1166                                        int total_locks, u64 cookie,
1167                                        u8 flags, u8 master)
1168{
1169        /* mres here is one full page */
1170        clear_page(mres);
1171        mres->lockname_len = namelen;
1172        memcpy(mres->lockname, lockname, namelen);
1173        mres->num_locks = 0;
1174        mres->total_locks = cpu_to_be32(total_locks);
1175        mres->mig_cookie = cpu_to_be64(cookie);
1176        mres->flags = flags;
1177        mres->master = master;
1178}
1179
1180static void dlm_prepare_lvb_for_migration(struct dlm_lock *lock,
1181                                          struct dlm_migratable_lockres *mres,
1182                                          int queue)
1183{
1184        if (!lock->lksb)
1185               return;
1186
1187        /* Ignore lvb in all locks in the blocked list */
1188        if (queue == DLM_BLOCKED_LIST)
1189                return;
1190
1191        /* Only consider lvbs in locks with granted EX or PR lock levels */
1192        if (lock->ml.type != LKM_EXMODE && lock->ml.type != LKM_PRMODE)
1193                return;
1194
1195        if (dlm_lvb_is_empty(mres->lvb)) {
1196                memcpy(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN);
1197                return;
1198        }
1199
1200        /* Ensure the lvb copied for migration matches in other valid locks */
1201        if (!memcmp(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN))
1202                return;
1203
1204        mlog(ML_ERROR, "Mismatched lvb in lock cookie=%u:%llu, name=%.*s, "
1205             "node=%u\n",
1206             dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
1207             dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
1208             lock->lockres->lockname.len, lock->lockres->lockname.name,
1209             lock->ml.node);
1210        dlm_print_one_lock_resource(lock->lockres);
1211        BUG();
1212}
1213
1214/* returns 1 if this lock fills the network structure,
1215 * 0 otherwise */
1216static int dlm_add_lock_to_array(struct dlm_lock *lock,
1217                                 struct dlm_migratable_lockres *mres, int queue)
1218{
1219        struct dlm_migratable_lock *ml;
1220        int lock_num = mres->num_locks;
1221
1222        ml = &(mres->ml[lock_num]);
1223        ml->cookie = lock->ml.cookie;
1224        ml->type = lock->ml.type;
1225        ml->convert_type = lock->ml.convert_type;
1226        ml->highest_blocked = lock->ml.highest_blocked;
1227        ml->list = queue;
1228        if (lock->lksb) {
1229                ml->flags = lock->lksb->flags;
1230                dlm_prepare_lvb_for_migration(lock, mres, queue);
1231        }
1232        ml->node = lock->ml.node;
1233        mres->num_locks++;
1234        /* we reached the max, send this network message */
1235        if (mres->num_locks == DLM_MAX_MIGRATABLE_LOCKS)
1236                return 1;
1237        return 0;
1238}
1239
1240static void dlm_add_dummy_lock(struct dlm_ctxt *dlm,
1241                               struct dlm_migratable_lockres *mres)
1242{
1243        struct dlm_lock dummy;
1244        memset(&dummy, 0, sizeof(dummy));
1245        dummy.ml.cookie = 0;
1246        dummy.ml.type = LKM_IVMODE;
1247        dummy.ml.convert_type = LKM_IVMODE;
1248        dummy.ml.highest_blocked = LKM_IVMODE;
1249        dummy.lksb = NULL;
1250        dummy.ml.node = dlm->node_num;
1251        dlm_add_lock_to_array(&dummy, mres, DLM_BLOCKED_LIST);
1252}
1253
1254static inline int dlm_is_dummy_lock(struct dlm_ctxt *dlm,
1255                                    struct dlm_migratable_lock *ml,
1256                                    u8 *nodenum)
1257{
1258        if (unlikely(ml->cookie == 0 &&
1259            ml->type == LKM_IVMODE &&
1260            ml->convert_type == LKM_IVMODE &&
1261            ml->highest_blocked == LKM_IVMODE &&
1262            ml->list == DLM_BLOCKED_LIST)) {
1263                *nodenum = ml->node;
1264                return 1;
1265        }
1266        return 0;
1267}
1268
1269int dlm_send_one_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
1270                         struct dlm_migratable_lockres *mres,
1271                         u8 send_to, u8 flags)
1272{
1273        struct list_head *queue;
1274        int total_locks, i;
1275        u64 mig_cookie = 0;
1276        struct dlm_lock *lock;
1277        int ret = 0;
1278
1279        BUG_ON(!(flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION)));
1280
1281        mlog(0, "sending to %u\n", send_to);
1282
1283        total_locks = dlm_num_locks_in_lockres(res);
1284        if (total_locks > DLM_MAX_MIGRATABLE_LOCKS) {
1285                /* rare, but possible */
1286                mlog(0, "argh.  lockres has %d locks.  this will "
1287                          "require more than one network packet to "
1288                          "migrate\n", total_locks);
1289                mig_cookie = dlm_get_next_mig_cookie();
1290        }
1291
1292        dlm_init_migratable_lockres(mres, res->lockname.name,
1293                                    res->lockname.len, total_locks,
1294                                    mig_cookie, flags, res->owner);
1295
1296        total_locks = 0;
1297        for (i=DLM_GRANTED_LIST; i<=DLM_BLOCKED_LIST; i++) {
1298                queue = dlm_list_idx_to_ptr(res, i);
1299                list_for_each_entry(lock, queue, list) {
1300                        /* add another lock. */
1301                        total_locks++;
1302                        if (!dlm_add_lock_to_array(lock, mres, i))
1303                                continue;
1304
1305                        /* this filled the lock message,
1306                         * we must send it immediately. */
1307                        ret = dlm_send_mig_lockres_msg(dlm, mres, send_to,
1308                                                       res, total_locks);
1309                        if (ret < 0)
1310                                goto error;
1311                }
1312        }
1313        if (total_locks == 0) {
1314                /* send a dummy lock to indicate a mastery reference only */
1315                mlog(0, "%s:%.*s: sending dummy lock to %u, %s\n",
1316                     dlm->name, res->lockname.len, res->lockname.name,
1317                     send_to, flags & DLM_MRES_RECOVERY ? "recovery" :
1318                     "migration");
1319                dlm_add_dummy_lock(dlm, mres);
1320        }
1321        /* flush any remaining locks */
1322        ret = dlm_send_mig_lockres_msg(dlm, mres, send_to, res, total_locks);
1323        if (ret < 0)
1324                goto error;
1325        return ret;
1326
1327error:
1328        mlog(ML_ERROR, "%s: dlm_send_mig_lockres_msg returned %d\n",
1329             dlm->name, ret);
1330        if (!dlm_is_host_down(ret))
1331                BUG();
1332        mlog(0, "%s: node %u went down while sending %s "
1333             "lockres %.*s\n", dlm->name, send_to,
1334             flags & DLM_MRES_RECOVERY ?  "recovery" : "migration",
1335             res->lockname.len, res->lockname.name);
1336        return ret;
1337}
1338
1339
1340
1341/*
1342 * this message will contain no more than one page worth of
1343 * recovery data, and it will work on only one lockres.
1344 * there may be many locks in this page, and we may need to wait
1345 * for additional packets to complete all the locks (rare, but
1346 * possible).
1347 */
1348/*
1349 * NOTE: the allocation error cases here are scary
1350 * we really cannot afford to fail an alloc in recovery
1351 * do we spin?  returning an error only delays the problem really
1352 */
1353
1354int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
1355                            void **ret_data)
1356{
1357        struct dlm_ctxt *dlm = data;
1358        struct dlm_migratable_lockres *mres =
1359                (struct dlm_migratable_lockres *)msg->buf;
1360        int ret = 0;
1361        u8 real_master;
1362        u8 extra_refs = 0;
1363        char *buf = NULL;
1364        struct dlm_work_item *item = NULL;
1365        struct dlm_lock_resource *res = NULL;
1366        unsigned int hash;
1367
1368        if (!dlm_grab(dlm))
1369                return -EINVAL;
1370
1371        if (!dlm_joined(dlm)) {
1372                mlog(ML_ERROR, "Domain %s not joined! "
1373                          "lockres %.*s, master %u\n",
1374                          dlm->name, mres->lockname_len,
1375                          mres->lockname, mres->master);
1376                dlm_put(dlm);
1377                return -EINVAL;
1378        }
1379
1380        BUG_ON(!(mres->flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION)));
1381
1382        real_master = mres->master;
1383        if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) {
1384                /* cannot migrate a lockres with no master */
1385                BUG_ON(!(mres->flags & DLM_MRES_RECOVERY));
1386        }
1387
1388        mlog(0, "%s message received from node %u\n",
1389                  (mres->flags & DLM_MRES_RECOVERY) ?
1390                  "recovery" : "migration", mres->master);
1391        if (mres->flags & DLM_MRES_ALL_DONE)
1392                mlog(0, "all done flag.  all lockres data received!\n");
1393
1394        ret = -ENOMEM;
1395        buf = kmalloc(be16_to_cpu(msg->data_len), GFP_NOFS);
1396        item = kzalloc(sizeof(*item), GFP_NOFS);
1397        if (!buf || !item)
1398                goto leave;
1399
1400        /* lookup the lock to see if we have a secondary queue for this
1401         * already...  just add the locks in and this will have its owner
1402         * and RECOVERY flag changed when it completes. */
1403        hash = dlm_lockid_hash(mres->lockname, mres->lockname_len);
1404        spin_lock(&dlm->spinlock);
1405        res = __dlm_lookup_lockres_full(dlm, mres->lockname, mres->lockname_len,
1406                        hash);
1407        if (res) {
1408                /* this will get a ref on res */
1409                /* mark it as recovering/migrating and hash it */
1410                spin_lock(&res->spinlock);
1411                if (res->state & DLM_LOCK_RES_DROPPING_REF) {
1412                        mlog(0, "%s: node is attempting to migrate "
1413                                "lockres %.*s, but marked as dropping "
1414                                " ref!\n", dlm->name,
1415                                mres->lockname_len, mres->lockname);
1416                        ret = -EINVAL;
1417                        spin_unlock(&res->spinlock);
1418                        spin_unlock(&dlm->spinlock);
1419                        dlm_lockres_put(res);
1420                        goto leave;
1421                }
1422
1423                if (mres->flags & DLM_MRES_RECOVERY) {
1424                        res->state |= DLM_LOCK_RES_RECOVERING;
1425                } else {
1426                        if (res->state & DLM_LOCK_RES_MIGRATING) {
1427                                /* this is at least the second
1428                                 * lockres message */
1429                                mlog(0, "lock %.*s is already migrating\n",
1430                                          mres->lockname_len,
1431                                          mres->lockname);
1432                        } else if (res->state & DLM_LOCK_RES_RECOVERING) {
1433                                /* caller should BUG */
1434                                mlog(ML_ERROR, "node is attempting to migrate "
1435                                     "lock %.*s, but marked as recovering!\n",
1436                                     mres->lockname_len, mres->lockname);
1437                                ret = -EFAULT;
1438                                spin_unlock(&res->spinlock);
1439                                spin_unlock(&dlm->spinlock);
1440                                dlm_lockres_put(res);
1441                                goto leave;
1442                        }
1443                        res->state |= DLM_LOCK_RES_MIGRATING;
1444                }
1445                spin_unlock(&res->spinlock);
1446                spin_unlock(&dlm->spinlock);
1447        } else {
1448                spin_unlock(&dlm->spinlock);
1449                /* need to allocate, just like if it was
1450                 * mastered here normally  */
1451                res = dlm_new_lockres(dlm, mres->lockname, mres->lockname_len);
1452                if (!res)
1453                        goto leave;
1454
1455                /* to match the ref that we would have gotten if
1456                 * dlm_lookup_lockres had succeeded */
1457                dlm_lockres_get(res);
1458
1459                /* mark it as recovering/migrating and hash it */
1460                if (mres->flags & DLM_MRES_RECOVERY)
1461                        res->state |= DLM_LOCK_RES_RECOVERING;
1462                else
1463                        res->state |= DLM_LOCK_RES_MIGRATING;
1464
1465                spin_lock(&dlm->spinlock);
1466                __dlm_insert_lockres(dlm, res);
1467                spin_unlock(&dlm->spinlock);
1468
1469                /* Add an extra ref for this lock-less lockres lest the
1470                 * dlm_thread purges it before we get the chance to add
1471                 * locks to it */
1472                dlm_lockres_get(res);
1473
1474                /* There are three refs that need to be put.
1475                 * 1. Taken above.
1476                 * 2. kref_init in dlm_new_lockres()->dlm_init_lockres().
1477                 * 3. dlm_lookup_lockres()
1478                 * The first one is handled at the end of this function. The
1479                 * other two are handled in the worker thread after locks have
1480                 * been attached. Yes, we don't wait for purge time to match
1481                 * kref_init. The lockres will still have atleast one ref
1482                 * added because it is in the hash __dlm_insert_lockres() */
1483                extra_refs++;
1484
1485                /* now that the new lockres is inserted,
1486                 * make it usable by other processes */
1487                spin_lock(&res->spinlock);
1488                res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
1489                spin_unlock(&res->spinlock);
1490                wake_up(&res->wq);
1491        }
1492
1493        /* at this point we have allocated everything we need,
1494         * and we have a hashed lockres with an extra ref and
1495         * the proper res->state flags. */
1496        ret = 0;
1497        spin_lock(&res->spinlock);
1498        /* drop this either when master requery finds a different master
1499         * or when a lock is added by the recovery worker */
1500        dlm_lockres_grab_inflight_ref(dlm, res);
1501        if (mres->master == DLM_LOCK_RES_OWNER_UNKNOWN) {
1502                /* migration cannot have an unknown master */
1503                BUG_ON(!(mres->flags & DLM_MRES_RECOVERY));
1504                mlog(0, "recovery has passed me a lockres with an "
1505                          "unknown owner.. will need to requery: "
1506                          "%.*s\n", mres->lockname_len, mres->lockname);
1507        } else {
1508                /* take a reference now to pin the lockres, drop it
1509                 * when locks are added in the worker */
1510                dlm_change_lockres_owner(dlm, res, dlm->node_num);
1511        }
1512        spin_unlock(&res->spinlock);
1513
1514        /* queue up work for dlm_mig_lockres_worker */
1515        dlm_grab(dlm);  /* get an extra ref for the work item */
1516        memcpy(buf, msg->buf, be16_to_cpu(msg->data_len));  /* copy the whole message */
1517        dlm_init_work_item(dlm, item, dlm_mig_lockres_worker, buf);
1518        item->u.ml.lockres = res; /* already have a ref */
1519        item->u.ml.real_master = real_master;
1520        item->u.ml.extra_ref = extra_refs;
1521        spin_lock(&dlm->work_lock);
1522        list_add_tail(&item->list, &dlm->work_list);
1523        spin_unlock(&dlm->work_lock);
1524        queue_work(dlm->dlm_worker, &dlm->dispatched_work);
1525
1526leave:
1527        /* One extra ref taken needs to be put here */
1528        if (extra_refs)
1529                dlm_lockres_put(res);
1530
1531        dlm_put(dlm);
1532        if (ret < 0) {
1533                kfree(buf);
1534                kfree(item);
1535                mlog_errno(ret);
1536        }
1537
1538        return ret;
1539}
1540
1541
1542static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data)
1543{
1544        struct dlm_ctxt *dlm;
1545        struct dlm_migratable_lockres *mres;
1546        int ret = 0;
1547        struct dlm_lock_resource *res;
1548        u8 real_master;
1549        u8 extra_ref;
1550
1551        dlm = item->dlm;
1552        mres = (struct dlm_migratable_lockres *)data;
1553
1554        res = item->u.ml.lockres;
1555        real_master = item->u.ml.real_master;
1556        extra_ref = item->u.ml.extra_ref;
1557
1558        if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) {
1559                /* this case is super-rare. only occurs if
1560                 * node death happens during migration. */
1561again:
1562                ret = dlm_lockres_master_requery(dlm, res, &real_master);
1563                if (ret < 0) {
1564                        mlog(0, "dlm_lockres_master_requery ret=%d\n",
1565                                  ret);
1566                        goto again;
1567                }
1568                if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) {
1569                        mlog(0, "lockres %.*s not claimed.  "
1570                                   "this node will take it.\n",
1571                                   res->lockname.len, res->lockname.name);
1572                } else {
1573                        spin_lock(&res->spinlock);
1574                        dlm_lockres_drop_inflight_ref(dlm, res);
1575                        spin_unlock(&res->spinlock);
1576                        mlog(0, "master needs to respond to sender "
1577                                  "that node %u still owns %.*s\n",
1578                                  real_master, res->lockname.len,
1579                                  res->lockname.name);
1580                        /* cannot touch this lockres */
1581                        goto leave;
1582                }
1583        }
1584
1585        ret = dlm_process_recovery_data(dlm, res, mres);
1586        if (ret < 0)
1587                mlog(0, "dlm_process_recovery_data returned  %d\n", ret);
1588        else
1589                mlog(0, "dlm_process_recovery_data succeeded\n");
1590
1591        if ((mres->flags & (DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) ==
1592                           (DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) {
1593                ret = dlm_finish_migration(dlm, res, mres->master);
1594                if (ret < 0)
1595                        mlog_errno(ret);
1596        }
1597
1598leave:
1599        /* See comment in dlm_mig_lockres_handler() */
1600        if (res) {
1601                if (extra_ref)
1602                        dlm_lockres_put(res);
1603                dlm_lockres_put(res);
1604        }
1605        kfree(data);
1606}
1607
1608
1609
1610static int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
1611                                      struct dlm_lock_resource *res,
1612                                      u8 *real_master)
1613{
1614        struct dlm_node_iter iter;
1615        int nodenum;
1616        int ret = 0;
1617
1618        *real_master = DLM_LOCK_RES_OWNER_UNKNOWN;
1619
1620        /* we only reach here if one of the two nodes in a
1621         * migration died while the migration was in progress.
1622         * at this point we need to requery the master.  we
1623         * know that the new_master got as far as creating
1624         * an mle on at least one node, but we do not know
1625         * if any nodes had actually cleared the mle and set
1626         * the master to the new_master.  the old master
1627         * is supposed to set the owner to UNKNOWN in the
1628         * event of a new_master death, so the only possible
1629         * responses that we can get from nodes here are
1630         * that the master is new_master, or that the master
1631         * is UNKNOWN.
1632         * if all nodes come back with UNKNOWN then we know
1633         * the lock needs remastering here.
1634         * if any node comes back with a valid master, check
1635         * to see if that master is the one that we are
1636         * recovering.  if so, then the new_master died and
1637         * we need to remaster this lock.  if not, then the
1638         * new_master survived and that node will respond to
1639         * other nodes about the owner.
1640         * if there is an owner, this node needs to dump this
1641         * lockres and alert the sender that this lockres
1642         * was rejected. */
1643        spin_lock(&dlm->spinlock);
1644        dlm_node_iter_init(dlm->domain_map, &iter);
1645        spin_unlock(&dlm->spinlock);
1646
1647        while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
1648                /* do not send to self */
1649                if (nodenum == dlm->node_num)
1650                        continue;
1651                ret = dlm_do_master_requery(dlm, res, nodenum, real_master);
1652                if (ret < 0) {
1653                        mlog_errno(ret);
1654                        if (!dlm_is_host_down(ret))
1655                                BUG();
1656                        /* host is down, so answer for that node would be
1657                         * DLM_LOCK_RES_OWNER_UNKNOWN.  continue. */
1658                }
1659                if (*real_master != DLM_LOCK_RES_OWNER_UNKNOWN) {
1660                        mlog(0, "lock master is %u\n", *real_master);
1661                        break;
1662                }
1663        }
1664        return ret;
1665}
1666
1667
1668int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
1669                          u8 nodenum, u8 *real_master)
1670{
1671        int ret;
1672        struct dlm_master_requery req;
1673        int status = DLM_LOCK_RES_OWNER_UNKNOWN;
1674
1675        memset(&req, 0, sizeof(req));
1676        req.node_idx = dlm->node_num;
1677        req.namelen = res->lockname.len;
1678        memcpy(req.name, res->lockname.name, res->lockname.len);
1679
1680resend:
1681        ret = o2net_send_message(DLM_MASTER_REQUERY_MSG, dlm->key,
1682                                 &req, sizeof(req), nodenum, &status);
1683        if (ret < 0)
1684                mlog(ML_ERROR, "Error %d when sending message %u (key "
1685                     "0x%x) to node %u\n", ret, DLM_MASTER_REQUERY_MSG,
1686                     dlm->key, nodenum);
1687        else if (status == -ENOMEM) {
1688                mlog_errno(status);
1689                msleep(50);
1690                goto resend;
1691        } else {
1692                BUG_ON(status < 0);
1693                BUG_ON(status > DLM_LOCK_RES_OWNER_UNKNOWN);
1694                *real_master = (u8) (status & 0xff);
1695                mlog(0, "node %u responded to master requery with %u\n",
1696                          nodenum, *real_master);
1697                ret = 0;
1698        }
1699        return ret;
1700}
1701
1702
1703/* this function cannot error, so unless the sending
1704 * or receiving of the message failed, the owner can
1705 * be trusted */
1706int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data,
1707                               void **ret_data)
1708{
1709        struct dlm_ctxt *dlm = data;
1710        struct dlm_master_requery *req = (struct dlm_master_requery *)msg->buf;
1711        struct dlm_lock_resource *res = NULL;
1712        unsigned int hash;
1713        int master = DLM_LOCK_RES_OWNER_UNKNOWN;
1714        u32 flags = DLM_ASSERT_MASTER_REQUERY;
1715        int dispatched = 0;
1716
1717        if (!dlm_grab(dlm)) {
1718                /* since the domain has gone away on this
1719                 * node, the proper response is UNKNOWN */
1720                return master;
1721        }
1722
1723        hash = dlm_lockid_hash(req->name, req->namelen);
1724
1725        spin_lock(&dlm->spinlock);
1726        res = __dlm_lookup_lockres(dlm, req->name, req->namelen, hash);
1727        if (res) {
1728                spin_lock(&res->spinlock);
1729                master = res->owner;
1730                if (master == dlm->node_num) {
1731                        int ret = dlm_dispatch_assert_master(dlm, res,
1732                                                             0, 0, flags);
1733                        if (ret < 0) {
1734                                mlog_errno(ret);
1735                                spin_unlock(&res->spinlock);
1736                                dlm_lockres_put(res);
1737                                spin_unlock(&dlm->spinlock);
1738                                dlm_put(dlm);
1739                                /* sender will take care of this and retry */
1740                                return ret;
1741                        } else {
1742                                dispatched = 1;
1743                                __dlm_lockres_grab_inflight_worker(dlm, res);
1744                                spin_unlock(&res->spinlock);
1745                        }
1746                } else {
1747                        /* put.. incase we are not the master */
1748                        spin_unlock(&res->spinlock);
1749                        dlm_lockres_put(res);
1750                }
1751        }
1752        spin_unlock(&dlm->spinlock);
1753
1754        if (!dispatched)
1755                dlm_put(dlm);
1756        return master;
1757}
1758
1759static inline struct list_head *
1760dlm_list_num_to_pointer(struct dlm_lock_resource *res, int list_num)
1761{
1762        struct list_head *ret;
1763        BUG_ON(list_num < 0);
1764        BUG_ON(list_num > 2);
1765        ret = &(res->granted);
1766        ret += list_num;
1767        return ret;
1768}
1769/* TODO: do ast flush business
1770 * TODO: do MIGRATING and RECOVERING spinning
1771 */
1772
1773/*
1774* NOTE about in-flight requests during migration:
1775*
1776* Before attempting the migrate, the master has marked the lockres as
1777* MIGRATING and then flushed all of its pending ASTS.  So any in-flight
1778* requests either got queued before the MIGRATING flag got set, in which
1779* case the lock data will reflect the change and a return message is on
1780* the way, or the request failed to get in before MIGRATING got set.  In
1781* this case, the caller will be told to spin and wait for the MIGRATING
1782* flag to be dropped, then recheck the master.
1783* This holds true for the convert, cancel and unlock cases, and since lvb
1784* updates are tied to these same messages, it applies to lvb updates as
1785* well.  For the lock case, there is no way a lock can be on the master
1786* queue and not be on the secondary queue since the lock is always added
1787* locally first.  This means that the new target node will never be sent
1788* a lock that he doesn't already have on the list.
1789* In total, this means that the local lock is correct and should not be
1790* updated to match the one sent by the master.  Any messages sent back
1791* from the master before the MIGRATING flag will bring the lock properly
1792* up-to-date, and the change will be ordered properly for the waiter.
1793* We will *not* attempt to modify the lock underneath the waiter.
1794*/
1795
1796static int dlm_process_recovery_data(struct dlm_ctxt *dlm,
1797                                     struct dlm_lock_resource *res,
1798                                     struct dlm_migratable_lockres *mres)
1799{
1800        struct dlm_migratable_lock *ml;
1801        struct list_head *queue, *iter;
1802        struct list_head *tmpq = NULL;
1803        struct dlm_lock *newlock = NULL;
1804        struct dlm_lockstatus *lksb = NULL;
1805        int ret = 0;
1806        int i, j, bad;
1807        struct dlm_lock *lock;
1808        u8 from = O2NM_MAX_NODES;
1809        __be64 c;
1810
1811        mlog(0, "running %d locks for this lockres\n", mres->num_locks);
1812        for (i=0; i<mres->num_locks; i++) {
1813                ml = &(mres->ml[i]);
1814
1815                if (dlm_is_dummy_lock(dlm, ml, &from)) {
1816                        /* placeholder, just need to set the refmap bit */
1817                        BUG_ON(mres->num_locks != 1);
1818                        mlog(0, "%s:%.*s: dummy lock for %u\n",
1819                             dlm->name, mres->lockname_len, mres->lockname,
1820                             from);
1821                        spin_lock(&res->spinlock);
1822                        dlm_lockres_set_refmap_bit(dlm, res, from);
1823                        spin_unlock(&res->spinlock);
1824                        break;
1825                }
1826                BUG_ON(ml->highest_blocked != LKM_IVMODE);
1827                newlock = NULL;
1828                lksb = NULL;
1829
1830                queue = dlm_list_num_to_pointer(res, ml->list);
1831                tmpq = NULL;
1832
1833                /* if the lock is for the local node it needs to
1834                 * be moved to the proper location within the queue.
1835                 * do not allocate a new lock structure. */
1836                if (ml->node == dlm->node_num) {
1837                        /* MIGRATION ONLY! */
1838                        BUG_ON(!(mres->flags & DLM_MRES_MIGRATION));
1839
1840                        lock = NULL;
1841                        spin_lock(&res->spinlock);
1842                        for (j = DLM_GRANTED_LIST; j <= DLM_BLOCKED_LIST; j++) {
1843                                tmpq = dlm_list_idx_to_ptr(res, j);
1844                                list_for_each(iter, tmpq) {
1845                                        lock = list_entry(iter,
1846                                                  struct dlm_lock, list);
1847                                        if (lock->ml.cookie == ml->cookie)
1848                                                break;
1849                                        lock = NULL;
1850                                }
1851                                if (lock)
1852                                        break;
1853                        }
1854
1855                        /* lock is always created locally first, and
1856                         * destroyed locally last.  it must be on the list */
1857                        if (!lock) {
1858                                c = ml->cookie;
1859                                mlog(ML_ERROR, "Could not find local lock "
1860                                               "with cookie %u:%llu, node %u, "
1861                                               "list %u, flags 0x%x, type %d, "
1862                                               "conv %d, highest blocked %d\n",
1863                                     dlm_get_lock_cookie_node(be64_to_cpu(c)),
1864                                     dlm_get_lock_cookie_seq(be64_to_cpu(c)),
1865                                     ml->node, ml->list, ml->flags, ml->type,
1866                                     ml->convert_type, ml->highest_blocked);
1867                                __dlm_print_one_lock_resource(res);
1868                                BUG();
1869                        }
1870
1871                        if (lock->ml.node != ml->node) {
1872                                c = lock->ml.cookie;
1873                                mlog(ML_ERROR, "Mismatched node# in lock "
1874                                     "cookie %u:%llu, name %.*s, node %u\n",
1875                                     dlm_get_lock_cookie_node(be64_to_cpu(c)),
1876                                     dlm_get_lock_cookie_seq(be64_to_cpu(c)),
1877                                     res->lockname.len, res->lockname.name,
1878                                     lock->ml.node);
1879                                c = ml->cookie;
1880                                mlog(ML_ERROR, "Migrate lock cookie %u:%llu, "
1881                                     "node %u, list %u, flags 0x%x, type %d, "
1882                                     "conv %d, highest blocked %d\n",
1883                                     dlm_get_lock_cookie_node(be64_to_cpu(c)),
1884                                     dlm_get_lock_cookie_seq(be64_to_cpu(c)),
1885                                     ml->node, ml->list, ml->flags, ml->type,
1886                                     ml->convert_type, ml->highest_blocked);
1887                                __dlm_print_one_lock_resource(res);
1888                                BUG();
1889                        }
1890
1891                        if (tmpq != queue) {
1892                                c = ml->cookie;
1893                                mlog(0, "Lock cookie %u:%llu was on list %u "
1894                                     "instead of list %u for %.*s\n",
1895                                     dlm_get_lock_cookie_node(be64_to_cpu(c)),
1896                                     dlm_get_lock_cookie_seq(be64_to_cpu(c)),
1897                                     j, ml->list, res->lockname.len,
1898                                     res->lockname.name);
1899                                __dlm_print_one_lock_resource(res);
1900                                spin_unlock(&res->spinlock);
1901                                continue;
1902                        }
1903
1904                        /* see NOTE above about why we do not update
1905                         * to match the master here */
1906
1907                        /* move the lock to its proper place */
1908                        /* do not alter lock refcount.  switching lists. */
1909                        list_move_tail(&lock->list, queue);
1910                        spin_unlock(&res->spinlock);
1911
1912                        mlog(0, "just reordered a local lock!\n");
1913                        continue;
1914                }
1915
1916                /* lock is for another node. */
1917                newlock = dlm_new_lock(ml->type, ml->node,
1918                                       be64_to_cpu(ml->cookie), NULL);
1919                if (!newlock) {
1920                        ret = -ENOMEM;
1921                        goto leave;
1922                }
1923                lksb = newlock->lksb;
1924                dlm_lock_attach_lockres(newlock, res);
1925
1926                if (ml->convert_type != LKM_IVMODE) {
1927                        BUG_ON(queue != &res->converting);
1928                        newlock->ml.convert_type = ml->convert_type;
1929                }
1930                lksb->flags |= (ml->flags &
1931                                (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB));
1932
1933                if (ml->type == LKM_NLMODE)
1934                        goto skip_lvb;
1935
1936                /*
1937                 * If the lock is in the blocked list it can't have a valid lvb,
1938                 * so skip it
1939                 */
1940                if (ml->list == DLM_BLOCKED_LIST)
1941                        goto skip_lvb;
1942
1943                if (!dlm_lvb_is_empty(mres->lvb)) {
1944                        if (lksb->flags & DLM_LKSB_PUT_LVB) {
1945                                /* other node was trying to update
1946                                 * lvb when node died.  recreate the
1947                                 * lksb with the updated lvb. */
1948                                memcpy(lksb->lvb, mres->lvb, DLM_LVB_LEN);
1949                                /* the lock resource lvb update must happen
1950                                 * NOW, before the spinlock is dropped.
1951                                 * we no longer wait for the AST to update
1952                                 * the lvb. */
1953                                memcpy(res->lvb, mres->lvb, DLM_LVB_LEN);
1954                        } else {
1955                                /* otherwise, the node is sending its
1956                                 * most recent valid lvb info */
1957                                BUG_ON(ml->type != LKM_EXMODE &&
1958                                       ml->type != LKM_PRMODE);
1959                                if (!dlm_lvb_is_empty(res->lvb) &&
1960                                    (ml->type == LKM_EXMODE ||
1961                                     memcmp(res->lvb, mres->lvb, DLM_LVB_LEN))) {
1962                                        int i;
1963                                        mlog(ML_ERROR, "%s:%.*s: received bad "
1964                                             "lvb! type=%d\n", dlm->name,
1965                                             res->lockname.len,
1966                                             res->lockname.name, ml->type);
1967                                        printk("lockres lvb=[");
1968                                        for (i=0; i<DLM_LVB_LEN; i++)
1969                                                printk("%02x", res->lvb[i]);
1970                                        printk("]\nmigrated lvb=[");
1971                                        for (i=0; i<DLM_LVB_LEN; i++)
1972                                                printk("%02x", mres->lvb[i]);
1973                                        printk("]\n");
1974                                        dlm_print_one_lock_resource(res);
1975                                        BUG();
1976                                }
1977                                memcpy(res->lvb, mres->lvb, DLM_LVB_LEN);
1978                        }
1979                }
1980skip_lvb:
1981
1982                /* NOTE:
1983                 * wrt lock queue ordering and recovery:
1984                 *    1. order of locks on granted queue is
1985                 *       meaningless.
1986                 *    2. order of locks on converting queue is
1987                 *       LOST with the node death.  sorry charlie.
1988                 *    3. order of locks on the blocked queue is
1989                 *       also LOST.
1990                 * order of locks does not affect integrity, it
1991                 * just means that a lock request may get pushed
1992                 * back in line as a result of the node death.
1993                 * also note that for a given node the lock order
1994                 * for its secondary queue locks is preserved
1995                 * relative to each other, but clearly *not*
1996                 * preserved relative to locks from other nodes.
1997                 */
1998                bad = 0;
1999                spin_lock(&res->spinlock);
2000                list_for_each_entry(lock, queue, list) {
2001                        if (lock->ml.cookie == ml->cookie) {
2002                                c = lock->ml.cookie;
2003                                mlog(ML_ERROR, "%s:%.*s: %u:%llu: lock already "
2004                                     "exists on this lockres!\n", dlm->name,
2005                                     res->lockname.len, res->lockname.name,
2006                                     dlm_get_lock_cookie_node(be64_to_cpu(c)),
2007                                     dlm_get_lock_cookie_seq(be64_to_cpu(c)));
2008
2009                                mlog(ML_NOTICE, "sent lock: type=%d, conv=%d, "
2010                                     "node=%u, cookie=%u:%llu, queue=%d\n",
2011                                     ml->type, ml->convert_type, ml->node,
2012                                     dlm_get_lock_cookie_node(be64_to_cpu(ml->cookie)),
2013                                     dlm_get_lock_cookie_seq(be64_to_cpu(ml->cookie)),
2014                                     ml->list);
2015
2016                                __dlm_print_one_lock_resource(res);
2017                                bad = 1;
2018                                break;
2019                        }
2020                }
2021                if (!bad) {
2022                        dlm_lock_get(newlock);
2023                        if (mres->flags & DLM_MRES_RECOVERY &&
2024                                        ml->list == DLM_CONVERTING_LIST &&
2025                                        newlock->ml.type >
2026                                        newlock->ml.convert_type) {
2027                                /* newlock is doing downconvert, add it to the
2028                                 * head of converting list */
2029                                list_add(&newlock->list, queue);
2030                        } else
2031                                list_add_tail(&newlock->list, queue);
2032                        mlog(0, "%s:%.*s: added lock for node %u, "
2033                             "setting refmap bit\n", dlm->name,
2034                             res->lockname.len, res->lockname.name, ml->node);
2035                        dlm_lockres_set_refmap_bit(dlm, res, ml->node);
2036                }
2037                spin_unlock(&res->spinlock);
2038        }
2039        mlog(0, "done running all the locks\n");
2040
2041leave:
2042        /* balance the ref taken when the work was queued */
2043        spin_lock(&res->spinlock);
2044        dlm_lockres_drop_inflight_ref(dlm, res);
2045        spin_unlock(&res->spinlock);
2046
2047        if (ret < 0)
2048                mlog_errno(ret);
2049
2050        return ret;
2051}
2052
2053void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
2054                                       struct dlm_lock_resource *res)
2055{
2056        int i;
2057        struct list_head *queue;
2058        struct dlm_lock *lock, *next;
2059
2060        assert_spin_locked(&dlm->spinlock);
2061        assert_spin_locked(&res->spinlock);
2062        res->state |= DLM_LOCK_RES_RECOVERING;
2063        if (!list_empty(&res->recovering)) {
2064                mlog(0,
2065                     "Recovering res %s:%.*s, is already on recovery list!\n",
2066                     dlm->name, res->lockname.len, res->lockname.name);
2067                list_del_init(&res->recovering);
2068                dlm_lockres_put(res);
2069        }
2070        /* We need to hold a reference while on the recovery list */
2071        dlm_lockres_get(res);
2072        list_add_tail(&res->recovering, &dlm->reco.resources);
2073
2074        /* find any pending locks and put them back on proper list */
2075        for (i=DLM_BLOCKED_LIST; i>=DLM_GRANTED_LIST; i--) {
2076                queue = dlm_list_idx_to_ptr(res, i);
2077                list_for_each_entry_safe(lock, next, queue, list) {
2078                        dlm_lock_get(lock);
2079                        if (lock->convert_pending) {
2080                                /* move converting lock back to granted */
2081                                mlog(0, "node died with convert pending "
2082                                     "on %.*s. move back to granted list.\n",
2083                                     res->lockname.len, res->lockname.name);
2084                                dlm_revert_pending_convert(res, lock);
2085                                lock->convert_pending = 0;
2086                        } else if (lock->lock_pending) {
2087                                /* remove pending lock requests completely */
2088                                BUG_ON(i != DLM_BLOCKED_LIST);
2089                                mlog(0, "node died with lock pending "
2090                                     "on %.*s. remove from blocked list and skip.\n",
2091                                     res->lockname.len, res->lockname.name);
2092                                /* lock will be floating until ref in
2093                                 * dlmlock_remote is freed after the network
2094                                 * call returns.  ok for it to not be on any
2095                                 * list since no ast can be called
2096                                 * (the master is dead). */
2097                                dlm_revert_pending_lock(res, lock);
2098                                lock->lock_pending = 0;
2099                        } else if (lock->unlock_pending) {
2100                                /* if an unlock was in progress, treat as
2101                                 * if this had completed successfully
2102                                 * before sending this lock state to the
2103                                 * new master.  note that the dlm_unlock
2104                                 * call is still responsible for calling
2105                                 * the unlockast.  that will happen after
2106                                 * the network call times out.  for now,
2107                                 * just move lists to prepare the new
2108                                 * recovery master.  */
2109                                BUG_ON(i != DLM_GRANTED_LIST);
2110                                mlog(0, "node died with unlock pending "
2111                                     "on %.*s. remove from blocked list and skip.\n",
2112                                     res->lockname.len, res->lockname.name);
2113                                dlm_commit_pending_unlock(res, lock);
2114                                lock->unlock_pending = 0;
2115                        } else if (lock->cancel_pending) {
2116                                /* if a cancel was in progress, treat as
2117                                 * if this had completed successfully
2118                                 * before sending this lock state to the
2119                                 * new master */
2120                                BUG_ON(i != DLM_CONVERTING_LIST);
2121                                mlog(0, "node died with cancel pending "
2122                                     "on %.*s. move back to granted list.\n",
2123                                     res->lockname.len, res->lockname.name);
2124                                dlm_commit_pending_cancel(res, lock);
2125                                lock->cancel_pending = 0;
2126                        }
2127                        dlm_lock_put(lock);
2128                }
2129        }
2130}
2131
2132
2133
2134/* removes all recovered locks from the recovery list.
2135 * sets the res->owner to the new master.
2136 * unsets the RECOVERY flag and wakes waiters. */
2137static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
2138                                              u8 dead_node, u8 new_master)
2139{
2140        int i;
2141        struct hlist_head *bucket;
2142        struct dlm_lock_resource *res, *next;
2143
2144        assert_spin_locked(&dlm->spinlock);
2145
2146        list_for_each_entry_safe(res, next, &dlm->reco.resources, recovering) {
2147                if (res->owner == dead_node) {
2148                        mlog(0, "%s: res %.*s, Changing owner from %u to %u\n",
2149                             dlm->name, res->lockname.len, res->lockname.name,
2150                             res->owner, new_master);
2151                        list_del_init(&res->recovering);
2152                        spin_lock(&res->spinlock);
2153                        /* new_master has our reference from
2154                         * the lock state sent during recovery */
2155                        dlm_change_lockres_owner(dlm, res, new_master);
2156                        res->state &= ~DLM_LOCK_RES_RECOVERING;
2157                        if (__dlm_lockres_has_locks(res))
2158                                __dlm_dirty_lockres(dlm, res);
2159                        spin_unlock(&res->spinlock);
2160                        wake_up(&res->wq);
2161                        dlm_lockres_put(res);
2162                }
2163        }
2164
2165        /* this will become unnecessary eventually, but
2166         * for now we need to run the whole hash, clear
2167         * the RECOVERING state and set the owner
2168         * if necessary */
2169        for (i = 0; i < DLM_HASH_BUCKETS; i++) {
2170                bucket = dlm_lockres_hash(dlm, i);
2171                hlist_for_each_entry(res, bucket, hash_node) {
2172                        if (res->state & DLM_LOCK_RES_RECOVERY_WAITING) {
2173                                spin_lock(&res->spinlock);
2174                                res->state &= ~DLM_LOCK_RES_RECOVERY_WAITING;
2175                                spin_unlock(&res->spinlock);
2176                                wake_up(&res->wq);
2177                        }
2178
2179                        if (!(res->state & DLM_LOCK_RES_RECOVERING))
2180                                continue;
2181
2182                        if (res->owner != dead_node &&
2183                            res->owner != dlm->node_num)
2184                                continue;
2185
2186                        if (!list_empty(&res->recovering)) {
2187                                list_del_init(&res->recovering);
2188                                dlm_lockres_put(res);
2189                        }
2190
2191                        /* new_master has our reference from
2192                         * the lock state sent during recovery */
2193                        mlog(0, "%s: res %.*s, Changing owner from %u to %u\n",
2194                             dlm->name, res->lockname.len, res->lockname.name,
2195                             res->owner, new_master);
2196                        spin_lock(&res->spinlock);
2197                        dlm_change_lockres_owner(dlm, res, new_master);
2198                        res->state &= ~DLM_LOCK_RES_RECOVERING;
2199                        if (__dlm_lockres_has_locks(res))
2200                                __dlm_dirty_lockres(dlm, res);
2201                        spin_unlock(&res->spinlock);
2202                        wake_up(&res->wq);
2203                }
2204        }
2205}
2206
2207static inline int dlm_lvb_needs_invalidation(struct dlm_lock *lock, int local)
2208{
2209        if (local) {
2210                if (lock->ml.type != LKM_EXMODE &&
2211                    lock->ml.type != LKM_PRMODE)
2212                        return 1;
2213        } else if (lock->ml.type == LKM_EXMODE)
2214                return 1;
2215        return 0;
2216}
2217
2218static void dlm_revalidate_lvb(struct dlm_ctxt *dlm,
2219                               struct dlm_lock_resource *res, u8 dead_node)
2220{
2221        struct list_head *queue;
2222        struct dlm_lock *lock;
2223        int blank_lvb = 0, local = 0;
2224        int i;
2225        u8 search_node;
2226
2227        assert_spin_locked(&dlm->spinlock);
2228        assert_spin_locked(&res->spinlock);
2229
2230        if (res->owner == dlm->node_num)
2231                /* if this node owned the lockres, and if the dead node
2232                 * had an EX when he died, blank out the lvb */
2233                search_node = dead_node;
2234        else {
2235                /* if this is a secondary lockres, and we had no EX or PR
2236                 * locks granted, we can no longer trust the lvb */
2237                search_node = dlm->node_num;
2238                local = 1;  /* check local state for valid lvb */
2239        }
2240
2241        for (i=DLM_GRANTED_LIST; i<=DLM_CONVERTING_LIST; i++) {
2242                queue = dlm_list_idx_to_ptr(res, i);
2243                list_for_each_entry(lock, queue, list) {
2244                        if (lock->ml.node == search_node) {
2245                                if (dlm_lvb_needs_invalidation(lock, local)) {
2246                                        /* zero the lksb lvb and lockres lvb */
2247                                        blank_lvb = 1;
2248                                        memset(lock->lksb->lvb, 0, DLM_LVB_LEN);
2249                                }
2250                        }
2251                }
2252        }
2253
2254        if (blank_lvb) {
2255                mlog(0, "clearing %.*s lvb, dead node %u had EX\n",
2256                     res->lockname.len, res->lockname.name, dead_node);
2257                memset(res->lvb, 0, DLM_LVB_LEN);
2258        }
2259}
2260
2261static void dlm_free_dead_locks(struct dlm_ctxt *dlm,
2262                                struct dlm_lock_resource *res, u8 dead_node)
2263{
2264        struct dlm_lock *lock, *next;
2265        unsigned int freed = 0;
2266
2267        /* this node is the lockres master:
2268         * 1) remove any stale locks for the dead node
2269         * 2) if the dead node had an EX when he died, blank out the lvb
2270         */
2271        assert_spin_locked(&dlm->spinlock);
2272        assert_spin_locked(&res->spinlock);
2273
2274        /* We do two dlm_lock_put(). One for removing from list and the other is
2275         * to force the DLM_UNLOCK_FREE_LOCK action so as to free the locks */
2276
2277        /* TODO: check pending_asts, pending_basts here */
2278        list_for_each_entry_safe(lock, next, &res->granted, list) {
2279                if (lock->ml.node == dead_node) {
2280                        list_del_init(&lock->list);
2281                        dlm_lock_put(lock);
2282                        /* Can't schedule DLM_UNLOCK_FREE_LOCK - do manually */
2283                        dlm_lock_put(lock);
2284                        freed++;
2285                }
2286        }
2287        list_for_each_entry_safe(lock, next, &res->converting, list) {
2288                if (lock->ml.node == dead_node) {
2289                        list_del_init(&lock->list);
2290                        dlm_lock_put(lock);
2291                        /* Can't schedule DLM_UNLOCK_FREE_LOCK - do manually */
2292                        dlm_lock_put(lock);
2293                        freed++;
2294                }
2295        }
2296        list_for_each_entry_safe(lock, next, &res->blocked, list) {
2297                if (lock->ml.node == dead_node) {
2298                        list_del_init(&lock->list);
2299                        dlm_lock_put(lock);
2300                        /* Can't schedule DLM_UNLOCK_FREE_LOCK - do manually */
2301                        dlm_lock_put(lock);
2302                        freed++;
2303                }
2304        }
2305
2306        if (freed) {
2307                mlog(0, "%s:%.*s: freed %u locks for dead node %u, "
2308                     "dropping ref from lockres\n", dlm->name,
2309                     res->lockname.len, res->lockname.name, freed, dead_node);
2310                if(!test_bit(dead_node, res->refmap)) {
2311                        mlog(ML_ERROR, "%s:%.*s: freed %u locks for dead node %u, "
2312                             "but ref was not set\n", dlm->name,
2313                             res->lockname.len, res->lockname.name, freed, dead_node);
2314                        __dlm_print_one_lock_resource(res);
2315                }
2316                res->state |= DLM_LOCK_RES_RECOVERY_WAITING;
2317                dlm_lockres_clear_refmap_bit(dlm, res, dead_node);
2318        } else if (test_bit(dead_node, res->refmap)) {
2319                mlog(0, "%s:%.*s: dead node %u had a ref, but had "
2320                     "no locks and had not purged before dying\n", dlm->name,
2321                     res->lockname.len, res->lockname.name, dead_node);
2322                dlm_lockres_clear_refmap_bit(dlm, res, dead_node);
2323        }
2324
2325        /* do not kick thread yet */
2326        __dlm_dirty_lockres(dlm, res);
2327}
2328
2329static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node)
2330{
2331        struct dlm_lock_resource *res;
2332        int i;
2333        struct hlist_head *bucket;
2334        struct hlist_node *tmp;
2335        struct dlm_lock *lock;
2336
2337
2338        /* purge any stale mles */
2339        dlm_clean_master_list(dlm, dead_node);
2340
2341        /*
2342         * now clean up all lock resources.  there are two rules:
2343         *
2344         * 1) if the dead node was the master, move the lockres
2345         *    to the recovering list.  set the RECOVERING flag.
2346         *    this lockres needs to be cleaned up before it can
2347         *    be used further.
2348         *
2349         * 2) if this node was the master, remove all locks from
2350         *    each of the lockres queues that were owned by the
2351         *    dead node.  once recovery finishes, the dlm thread
2352         *    can be kicked again to see if any ASTs or BASTs
2353         *    need to be fired as a result.
2354         */
2355        for (i = 0; i < DLM_HASH_BUCKETS; i++) {
2356                bucket = dlm_lockres_hash(dlm, i);
2357                hlist_for_each_entry_safe(res, tmp, bucket, hash_node) {
2358                        /* always prune any $RECOVERY entries for dead nodes,
2359                         * otherwise hangs can occur during later recovery */
2360                        if (dlm_is_recovery_lock(res->lockname.name,
2361                                                 res->lockname.len)) {
2362                                spin_lock(&res->spinlock);
2363                                list_for_each_entry(lock, &res->granted, list) {
2364                                        if (lock->ml.node == dead_node) {
2365                                                mlog(0, "AHA! there was "
2366                                                     "a $RECOVERY lock for dead "
2367                                                     "node %u (%s)!\n",
2368                                                     dead_node, dlm->name);
2369                                                list_del_init(&lock->list);
2370                                                dlm_lock_put(lock);
2371                                                /* Can't schedule
2372                                                 * DLM_UNLOCK_FREE_LOCK
2373                                                 * - do manually */
2374                                                dlm_lock_put(lock);
2375                                                break;
2376                                        }
2377                                }
2378
2379                                if ((res->owner == dead_node) &&
2380                                                        (res->state & DLM_LOCK_RES_DROPPING_REF)) {
2381                                        dlm_lockres_get(res);
2382                                        __dlm_do_purge_lockres(dlm, res);
2383                                        spin_unlock(&res->spinlock);
2384                                        wake_up(&res->wq);
2385                                        dlm_lockres_put(res);
2386                                        continue;
2387                                } else if (res->owner == dlm->node_num)
2388                                        dlm_lockres_clear_refmap_bit(dlm, res, dead_node);
2389                                spin_unlock(&res->spinlock);
2390                                continue;
2391                        }
2392                        spin_lock(&res->spinlock);
2393                        /* zero the lvb if necessary */
2394                        dlm_revalidate_lvb(dlm, res, dead_node);
2395                        if (res->owner == dead_node) {
2396                                if (res->state & DLM_LOCK_RES_DROPPING_REF) {
2397                                        mlog(0, "%s:%.*s: owned by "
2398                                                "dead node %u, this node was "
2399                                                "dropping its ref when master died. "
2400                                                "continue, purging the lockres.\n",
2401                                                dlm->name, res->lockname.len,
2402                                                res->lockname.name, dead_node);
2403                                        dlm_lockres_get(res);
2404                                        __dlm_do_purge_lockres(dlm, res);
2405                                        spin_unlock(&res->spinlock);
2406                                        wake_up(&res->wq);
2407                                        dlm_lockres_put(res);
2408                                        continue;
2409                                }
2410                                dlm_move_lockres_to_recovery_list(dlm, res);
2411                        } else if (res->owner == dlm->node_num) {
2412                                dlm_free_dead_locks(dlm, res, dead_node);
2413                                __dlm_lockres_calc_usage(dlm, res);
2414                        } else if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) {
2415                                if (test_bit(dead_node, res->refmap)) {
2416                                        mlog(0, "%s:%.*s: dead node %u had a ref, but had "
2417                                                "no locks and had not purged before dying\n",
2418                                                dlm->name, res->lockname.len,
2419                                                res->lockname.name, dead_node);
2420                                        dlm_lockres_clear_refmap_bit(dlm, res, dead_node);
2421                                }
2422                        }
2423                        spin_unlock(&res->spinlock);
2424                }
2425        }
2426
2427}
2428
2429static void __dlm_hb_node_down(struct dlm_ctxt *dlm, int idx)
2430{
2431        assert_spin_locked(&dlm->spinlock);
2432
2433        if (dlm->reco.new_master == idx) {
2434                mlog(0, "%s: recovery master %d just died\n",
2435                     dlm->name, idx);
2436                if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) {
2437                        /* finalize1 was reached, so it is safe to clear
2438                         * the new_master and dead_node.  that recovery
2439                         * is complete. */
2440                        mlog(0, "%s: dead master %d had reached "
2441                             "finalize1 state, clearing\n", dlm->name, idx);
2442                        dlm->reco.state &= ~DLM_RECO_STATE_FINALIZE;
2443                        __dlm_reset_recovery(dlm);
2444                }
2445        }
2446
2447        /* Clean up join state on node death. */
2448        if (dlm->joining_node == idx) {
2449                mlog(0, "Clearing join state for node %u\n", idx);
2450                __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
2451        }
2452
2453        /* check to see if the node is already considered dead */
2454        if (!test_bit(idx, dlm->live_nodes_map)) {
2455                mlog(0, "for domain %s, node %d is already dead. "
2456                     "another node likely did recovery already.\n",
2457                     dlm->name, idx);
2458                return;
2459        }
2460
2461        /* check to see if we do not care about this node */
2462        if (!test_bit(idx, dlm->domain_map)) {
2463                /* This also catches the case that we get a node down
2464                 * but haven't joined the domain yet. */
2465                mlog(0, "node %u already removed from domain!\n", idx);
2466                return;
2467        }
2468
2469        clear_bit(idx, dlm->live_nodes_map);
2470
2471        /* make sure local cleanup occurs before the heartbeat events */
2472        if (!test_bit(idx, dlm->recovery_map))
2473                dlm_do_local_recovery_cleanup(dlm, idx);
2474
2475        /* notify anything attached to the heartbeat events */
2476        dlm_hb_event_notify_attached(dlm, idx, 0);
2477
2478        mlog(0, "node %u being removed from domain map!\n", idx);
2479        clear_bit(idx, dlm->domain_map);
2480        clear_bit(idx, dlm->exit_domain_map);
2481        /* wake up migration waiters if a node goes down.
2482         * perhaps later we can genericize this for other waiters. */
2483        wake_up(&dlm->migration_wq);
2484
2485        set_bit(idx, dlm->recovery_map);
2486}
2487
2488void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data)
2489{
2490        struct dlm_ctxt *dlm = data;
2491
2492        if (!dlm_grab(dlm))
2493                return;
2494
2495        /*
2496         * This will notify any dlm users that a node in our domain
2497         * went away without notifying us first.
2498         */
2499        if (test_bit(idx, dlm->domain_map))
2500                dlm_fire_domain_eviction_callbacks(dlm, idx);
2501
2502        spin_lock(&dlm->spinlock);
2503        __dlm_hb_node_down(dlm, idx);
2504        spin_unlock(&dlm->spinlock);
2505
2506        dlm_put(dlm);
2507}
2508
2509void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data)
2510{
2511        struct dlm_ctxt *dlm = data;
2512
2513        if (!dlm_grab(dlm))
2514                return;
2515
2516        spin_lock(&dlm->spinlock);
2517        set_bit(idx, dlm->live_nodes_map);
2518        /* do NOT notify mle attached to the heartbeat events.
2519         * new nodes are not interesting in mastery until joined. */
2520        spin_unlock(&dlm->spinlock);
2521
2522        dlm_put(dlm);
2523}
2524
2525static void dlm_reco_ast(void *astdata)
2526{
2527        struct dlm_ctxt *dlm = astdata;
2528        mlog(0, "ast for recovery lock fired!, this=%u, dlm=%s\n",
2529             dlm->node_num, dlm->name);
2530}
2531static void dlm_reco_bast(void *astdata, int blocked_type)
2532{
2533        struct dlm_ctxt *dlm = astdata;
2534        mlog(0, "bast for recovery lock fired!, this=%u, dlm=%s\n",
2535             dlm->node_num, dlm->name);
2536}
2537static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st)
2538{
2539        mlog(0, "unlockast for recovery lock fired!\n");
2540}
2541
2542/*
2543 * dlm_pick_recovery_master will continually attempt to use
2544 * dlmlock() on the special "$RECOVERY" lockres with the
2545 * LKM_NOQUEUE flag to get an EX.  every thread that enters
2546 * this function on each node racing to become the recovery
2547 * master will not stop attempting this until either:
2548 * a) this node gets the EX (and becomes the recovery master),
2549 * or b) dlm->reco.new_master gets set to some nodenum
2550 * != O2NM_INVALID_NODE_NUM (another node will do the reco).
2551 * so each time a recovery master is needed, the entire cluster
2552 * will sync at this point.  if the new master dies, that will
2553 * be detected in dlm_do_recovery */
2554static int dlm_pick_recovery_master(struct dlm_ctxt *dlm)
2555{
2556        enum dlm_status ret;
2557        struct dlm_lockstatus lksb;
2558        int status = -EINVAL;
2559
2560        mlog(0, "starting recovery of %s at %lu, dead=%u, this=%u\n",
2561             dlm->name, jiffies, dlm->reco.dead_node, dlm->node_num);
2562again:
2563        memset(&lksb, 0, sizeof(lksb));
2564
2565        ret = dlmlock(dlm, LKM_EXMODE, &lksb, LKM_NOQUEUE|LKM_RECOVERY,
2566                      DLM_RECOVERY_LOCK_NAME, DLM_RECOVERY_LOCK_NAME_LEN,
2567                      dlm_reco_ast, dlm, dlm_reco_bast);
2568
2569        mlog(0, "%s: dlmlock($RECOVERY) returned %d, lksb=%d\n",
2570             dlm->name, ret, lksb.status);
2571
2572        if (ret == DLM_NORMAL) {
2573                mlog(0, "dlm=%s dlmlock says I got it (this=%u)\n",
2574                     dlm->name, dlm->node_num);
2575
2576                /* got the EX lock.  check to see if another node
2577                 * just became the reco master */
2578                if (dlm_reco_master_ready(dlm)) {
2579                        mlog(0, "%s: got reco EX lock, but %u will "
2580                             "do the recovery\n", dlm->name,
2581                             dlm->reco.new_master);
2582                        status = -EEXIST;
2583                } else {
2584                        status = 0;
2585
2586                        /* see if recovery was already finished elsewhere */
2587                        spin_lock(&dlm->spinlock);
2588                        if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) {
2589                                status = -EINVAL;
2590                                mlog(0, "%s: got reco EX lock, but "
2591                                     "node got recovered already\n", dlm->name);
2592                                if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM) {
2593                                        mlog(ML_ERROR, "%s: new master is %u "
2594                                             "but no dead node!\n",
2595                                             dlm->name, dlm->reco.new_master);
2596                                        BUG();
2597                                }
2598                        }
2599                        spin_unlock(&dlm->spinlock);
2600                }
2601
2602                /* if this node has actually become the recovery master,
2603                 * set the master and send the messages to begin recovery */
2604                if (!status) {
2605                        mlog(0, "%s: dead=%u, this=%u, sending "
2606                             "begin_reco now\n", dlm->name,
2607                             dlm->reco.dead_node, dlm->node_num);
2608                        status = dlm_send_begin_reco_message(dlm,
2609                                      dlm->reco.dead_node);
2610                        /* this always succeeds */
2611                        BUG_ON(status);
2612
2613                        /* set the new_master to this node */
2614                        spin_lock(&dlm->spinlock);
2615                        dlm_set_reco_master(dlm, dlm->node_num);
2616                        spin_unlock(&dlm->spinlock);
2617                }
2618
2619                /* recovery lock is a special case.  ast will not get fired,
2620                 * so just go ahead and unlock it. */
2621                ret = dlmunlock(dlm, &lksb, 0, dlm_reco_unlock_ast, dlm);
2622                if (ret == DLM_DENIED) {
2623                        mlog(0, "got DLM_DENIED, trying LKM_CANCEL\n");
2624                        ret = dlmunlock(dlm, &lksb, LKM_CANCEL, dlm_reco_unlock_ast, dlm);
2625                }
2626                if (ret != DLM_NORMAL) {
2627                        /* this would really suck. this could only happen
2628                         * if there was a network error during the unlock
2629                         * because of node death.  this means the unlock
2630                         * is actually "done" and the lock structure is
2631                         * even freed.  we can continue, but only
2632                         * because this specific lock name is special. */
2633                        mlog(ML_ERROR, "dlmunlock returned %d\n", ret);
2634                }
2635        } else if (ret == DLM_NOTQUEUED) {
2636                mlog(0, "dlm=%s dlmlock says another node got it (this=%u)\n",
2637                     dlm->name, dlm->node_num);
2638                /* another node is master. wait on
2639                 * reco.new_master != O2NM_INVALID_NODE_NUM
2640                 * for at most one second */
2641                wait_event_timeout(dlm->dlm_reco_thread_wq,
2642                                         dlm_reco_master_ready(dlm),
2643                                         msecs_to_jiffies(1000));
2644                if (!dlm_reco_master_ready(dlm)) {
2645                        mlog(0, "%s: reco master taking awhile\n",
2646                             dlm->name);
2647                        goto again;
2648                }
2649                /* another node has informed this one that it is reco master */
2650                mlog(0, "%s: reco master %u is ready to recover %u\n",
2651                     dlm->name, dlm->reco.new_master, dlm->reco.dead_node);
2652                status = -EEXIST;
2653        } else if (ret == DLM_RECOVERING) {
2654                mlog(0, "dlm=%s dlmlock says master node died (this=%u)\n",
2655                     dlm->name, dlm->node_num);
2656                goto again;
2657        } else {
2658                struct dlm_lock_resource *res;
2659
2660                /* dlmlock returned something other than NOTQUEUED or NORMAL */
2661                mlog(ML_ERROR, "%s: got %s from dlmlock($RECOVERY), "
2662                     "lksb.status=%s\n", dlm->name, dlm_errname(ret),
2663                     dlm_errname(lksb.status));
2664                res = dlm_lookup_lockres(dlm, DLM_RECOVERY_LOCK_NAME,
2665                                         DLM_RECOVERY_LOCK_NAME_LEN);
2666                if (res) {
2667                        dlm_print_one_lock_resource(res);
2668                        dlm_lockres_put(res);
2669                } else {
2670                        mlog(ML_ERROR, "recovery lock not found\n");
2671                }
2672                BUG();
2673        }
2674
2675        return status;
2676}
2677
2678static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node)
2679{
2680        struct dlm_begin_reco br;
2681        int ret = 0;
2682        struct dlm_node_iter iter;
2683        int nodenum;
2684        int status;
2685
2686        mlog(0, "%s: dead node is %u\n", dlm->name, dead_node);
2687
2688        spin_lock(&dlm->spinlock);
2689        dlm_node_iter_init(dlm->domain_map, &iter);
2690        spin_unlock(&dlm->spinlock);
2691
2692        clear_bit(dead_node, iter.node_map);
2693
2694        memset(&br, 0, sizeof(br));
2695        br.node_idx = dlm->node_num;
2696        br.dead_node = dead_node;
2697
2698        while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
2699                ret = 0;
2700                if (nodenum == dead_node) {
2701                        mlog(0, "not sending begin reco to dead node "
2702                                  "%u\n", dead_node);
2703                        continue;
2704                }
2705                if (nodenum == dlm->node_num) {
2706                        mlog(0, "not sending begin reco to self\n");
2707                        continue;
2708                }
2709retry:
2710                ret = -EINVAL;
2711                mlog(0, "attempting to send begin reco msg to %d\n",
2712                          nodenum);
2713                ret = o2net_send_message(DLM_BEGIN_RECO_MSG, dlm->key,
2714                                         &br, sizeof(br), nodenum, &status);
2715                /* negative status is handled ok by caller here */
2716                if (ret >= 0)
2717                        ret = status;
2718                if (dlm_is_host_down(ret)) {
2719                        /* node is down.  not involved in recovery
2720                         * so just keep going */
2721                        mlog(ML_NOTICE, "%s: node %u was down when sending "
2722                             "begin reco msg (%d)\n", dlm->name, nodenum, ret);
2723                        ret = 0;
2724                }
2725
2726                /*
2727                 * Prior to commit aad1b15310b9bcd59fa81ab8f2b1513b59553ea8,
2728                 * dlm_begin_reco_handler() returned EAGAIN and not -EAGAIN.
2729                 * We are handling both for compatibility reasons.
2730                 */
2731                if (ret == -EAGAIN || ret == EAGAIN) {
2732                        mlog(0, "%s: trying to start recovery of node "
2733                             "%u, but node %u is waiting for last recovery "
2734                             "to complete, backoff for a bit\n", dlm->name,
2735                             dead_node, nodenum);
2736                        msleep(100);
2737                        goto retry;
2738                }
2739                if (ret < 0) {
2740                        struct dlm_lock_resource *res;
2741
2742                        /* this is now a serious problem, possibly ENOMEM
2743                         * in the network stack.  must retry */
2744                        mlog_errno(ret);
2745                        mlog(ML_ERROR, "begin reco of dlm %s to node %u "
2746                             "returned %d\n", dlm->name, nodenum, ret);
2747                        res = dlm_lookup_lockres(dlm, DLM_RECOVERY_LOCK_NAME,
2748                                                 DLM_RECOVERY_LOCK_NAME_LEN);
2749                        if (res) {
2750                                dlm_print_one_lock_resource(res);
2751                                dlm_lockres_put(res);
2752                        } else {
2753                                mlog(ML_ERROR, "recovery lock not found\n");
2754                        }
2755                        /* sleep for a bit in hopes that we can avoid
2756                         * another ENOMEM */
2757                        msleep(100);
2758                        goto retry;
2759                }
2760        }
2761
2762        return ret;
2763}
2764
2765int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data,
2766                           void **ret_data)
2767{
2768        struct dlm_ctxt *dlm = data;
2769        struct dlm_begin_reco *br = (struct dlm_begin_reco *)msg->buf;
2770
2771        /* ok to return 0, domain has gone away */
2772        if (!dlm_grab(dlm))
2773                return 0;
2774
2775        spin_lock(&dlm->spinlock);
2776        if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) {
2777                mlog(0, "%s: node %u wants to recover node %u (%u:%u) "
2778                     "but this node is in finalize state, waiting on finalize2\n",
2779                     dlm->name, br->node_idx, br->dead_node,
2780                     dlm->reco.dead_node, dlm->reco.new_master);
2781                spin_unlock(&dlm->spinlock);
2782                dlm_put(dlm);
2783                return -EAGAIN;
2784        }
2785        spin_unlock(&dlm->spinlock);
2786
2787        mlog(0, "%s: node %u wants to recover node %u (%u:%u)\n",
2788             dlm->name, br->node_idx, br->dead_node,
2789             dlm->reco.dead_node, dlm->reco.new_master);
2790
2791        dlm_fire_domain_eviction_callbacks(dlm, br->dead_node);
2792
2793        spin_lock(&dlm->spinlock);
2794        if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM) {
2795                if (test_bit(dlm->reco.new_master, dlm->recovery_map)) {
2796                        mlog(0, "%s: new_master %u died, changing "
2797                             "to %u\n", dlm->name, dlm->reco.new_master,
2798                             br->node_idx);
2799                } else {
2800                        mlog(0, "%s: new_master %u NOT DEAD, changing "
2801                             "to %u\n", dlm->name, dlm->reco.new_master,
2802                             br->node_idx);
2803                        /* may not have seen the new master as dead yet */
2804                }
2805        }
2806        if (dlm->reco.dead_node != O2NM_INVALID_NODE_NUM) {
2807                mlog(ML_NOTICE, "%s: dead_node previously set to %u, "
2808                     "node %u changing it to %u\n", dlm->name,
2809                     dlm->reco.dead_node, br->node_idx, br->dead_node);
2810        }
2811        dlm_set_reco_master(dlm, br->node_idx);
2812        dlm_set_reco_dead_node(dlm, br->dead_node);
2813        if (!test_bit(br->dead_node, dlm->recovery_map)) {
2814                mlog(0, "recovery master %u sees %u as dead, but this "
2815                     "node has not yet.  marking %u as dead\n",
2816                     br->node_idx, br->dead_node, br->dead_node);
2817                if (!test_bit(br->dead_node, dlm->domain_map) ||
2818                    !test_bit(br->dead_node, dlm->live_nodes_map))
2819                        mlog(0, "%u not in domain/live_nodes map "
2820                             "so setting it in reco map manually\n",
2821                             br->dead_node);
2822                /* force the recovery cleanup in __dlm_hb_node_down
2823                 * both of these will be cleared in a moment */
2824                set_bit(br->dead_node, dlm->domain_map);
2825                set_bit(br->dead_node, dlm->live_nodes_map);
2826                __dlm_hb_node_down(dlm, br->dead_node);
2827        }
2828        spin_unlock(&dlm->spinlock);
2829
2830        dlm_kick_recovery_thread(dlm);
2831
2832        mlog(0, "%s: recovery started by node %u, for %u (%u:%u)\n",
2833             dlm->name, br->node_idx, br->dead_node,
2834             dlm->reco.dead_node, dlm->reco.new_master);
2835
2836        dlm_put(dlm);
2837        return 0;
2838}
2839
2840#define DLM_FINALIZE_STAGE2  0x01
2841static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm)
2842{
2843        int ret = 0;
2844        struct dlm_finalize_reco fr;
2845        struct dlm_node_iter iter;
2846        int nodenum;
2847        int status;
2848        int stage = 1;
2849
2850        mlog(0, "finishing recovery for node %s:%u, "
2851             "stage %d\n", dlm->name, dlm->reco.dead_node, stage);
2852
2853        spin_lock(&dlm->spinlock);
2854        dlm_node_iter_init(dlm->domain_map, &iter);
2855        spin_unlock(&dlm->spinlock);
2856
2857stage2:
2858        memset(&fr, 0, sizeof(fr));
2859        fr.node_idx = dlm->node_num;
2860        fr.dead_node = dlm->reco.dead_node;
2861        if (stage == 2)
2862                fr.flags |= DLM_FINALIZE_STAGE2;
2863
2864        while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
2865                if (nodenum == dlm->node_num)
2866                        continue;
2867                ret = o2net_send_message(DLM_FINALIZE_RECO_MSG, dlm->key,
2868                                         &fr, sizeof(fr), nodenum, &status);
2869                if (ret >= 0)
2870                        ret = status;
2871                if (ret < 0) {
2872                        mlog(ML_ERROR, "Error %d when sending message %u (key "
2873                             "0x%x) to node %u\n", ret, DLM_FINALIZE_RECO_MSG,
2874                             dlm->key, nodenum);
2875                        if (dlm_is_host_down(ret)) {
2876                                /* this has no effect on this recovery
2877                                 * session, so set the status to zero to
2878                                 * finish out the last recovery */
2879                                mlog(ML_ERROR, "node %u went down after this "
2880                                     "node finished recovery.\n", nodenum);
2881                                ret = 0;
2882                                continue;
2883                        }
2884                        break;
2885                }
2886        }
2887        if (stage == 1) {
2888                /* reset the node_iter back to the top and send finalize2 */
2889                iter.curnode = -1;
2890                stage = 2;
2891                goto stage2;
2892        }
2893
2894        return ret;
2895}
2896
2897int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data,
2898                              void **ret_data)
2899{
2900        struct dlm_ctxt *dlm = data;
2901        struct dlm_finalize_reco *fr = (struct dlm_finalize_reco *)msg->buf;
2902        int stage = 1;
2903
2904        /* ok to return 0, domain has gone away */
2905        if (!dlm_grab(dlm))
2906                return 0;
2907
2908        if (fr->flags & DLM_FINALIZE_STAGE2)
2909                stage = 2;
2910
2911        mlog(0, "%s: node %u finalizing recovery stage%d of "
2912             "node %u (%u:%u)\n", dlm->name, fr->node_idx, stage,
2913             fr->dead_node, dlm->reco.dead_node, dlm->reco.new_master);
2914
2915        spin_lock(&dlm->spinlock);
2916
2917        if (dlm->reco.new_master != fr->node_idx) {
2918                mlog(ML_ERROR, "node %u sent recovery finalize msg, but node "
2919                     "%u is supposed to be the new master, dead=%u\n",
2920                     fr->node_idx, dlm->reco.new_master, fr->dead_node);
2921                BUG();
2922        }
2923        if (dlm->reco.dead_node != fr->dead_node) {
2924                mlog(ML_ERROR, "node %u sent recovery finalize msg for dead "
2925                     "node %u, but node %u is supposed to be dead\n",
2926                     fr->node_idx, fr->dead_node, dlm->reco.dead_node);
2927                BUG();
2928        }
2929
2930        switch (stage) {
2931                case 1:
2932                        dlm_finish_local_lockres_recovery(dlm, fr->dead_node, fr->node_idx);
2933                        if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) {
2934                                mlog(ML_ERROR, "%s: received finalize1 from "
2935                                     "new master %u for dead node %u, but "
2936                                     "this node has already received it!\n",
2937                                     dlm->name, fr->node_idx, fr->dead_node);
2938                                dlm_print_reco_node_status(dlm);
2939                                BUG();
2940                        }
2941                        dlm->reco.state |= DLM_RECO_STATE_FINALIZE;
2942                        spin_unlock(&dlm->spinlock);
2943                        break;
2944                case 2:
2945                        if (!(dlm->reco.state & DLM_RECO_STATE_FINALIZE)) {
2946                                mlog(ML_ERROR, "%s: received finalize2 from "
2947                                     "new master %u for dead node %u, but "
2948                                     "this node did not have finalize1!\n",
2949                                     dlm->name, fr->node_idx, fr->dead_node);
2950                                dlm_print_reco_node_status(dlm);
2951                                BUG();
2952                        }
2953                        dlm->reco.state &= ~DLM_RECO_STATE_FINALIZE;
2954                        __dlm_reset_recovery(dlm);
2955                        spin_unlock(&dlm->spinlock);
2956                        dlm_kick_recovery_thread(dlm);
2957                        break;
2958        }
2959
2960        mlog(0, "%s: recovery done, reco master was %u, dead now %u, master now %u\n",
2961             dlm->name, fr->node_idx, dlm->reco.dead_node, dlm->reco.new_master);
2962
2963        dlm_put(dlm);
2964        return 0;
2965}
2966