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