diff options
Diffstat (limited to 'fs/dlm/recoverd.c')
| -rw-r--r-- | fs/dlm/recoverd.c | 290 |
1 files changed, 290 insertions, 0 deletions
diff --git a/fs/dlm/recoverd.c b/fs/dlm/recoverd.c new file mode 100644 index 000000000000..362e3eff4dc9 --- /dev/null +++ b/fs/dlm/recoverd.c @@ -0,0 +1,290 @@ +/****************************************************************************** +******************************************************************************* +** +** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. +** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. +** +** This copyrighted material is made available to anyone wishing to use, +** modify, copy, or redistribute it subject to the terms and conditions +** of the GNU General Public License v.2. +** +******************************************************************************* +******************************************************************************/ + +#include "dlm_internal.h" +#include "lockspace.h" +#include "member.h" +#include "dir.h" +#include "ast.h" +#include "recover.h" +#include "lowcomms.h" +#include "lock.h" +#include "requestqueue.h" +#include "recoverd.h" + + +/* If the start for which we're re-enabling locking (seq) has been superseded + by a newer stop (ls_recover_seq), we need to leave locking disabled. */ + +static int enable_locking(struct dlm_ls *ls, uint64_t seq) +{ + int error = -EINTR; + + spin_lock(&ls->ls_recover_lock); + if (ls->ls_recover_seq == seq) { + set_bit(LSFL_RUNNING, &ls->ls_flags); + up_write(&ls->ls_in_recovery); + error = 0; + } + spin_unlock(&ls->ls_recover_lock); + return error; +} + +static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv) +{ + unsigned long start; + int error, neg = 0; + + log_debug(ls, "recover %llx", rv->seq); + + mutex_lock(&ls->ls_recoverd_active); + + /* + * Suspending and resuming dlm_astd ensures that no lkb's from this ls + * will be processed by dlm_astd during recovery. + */ + + dlm_astd_suspend(); + dlm_astd_resume(); + + /* + * This list of root rsb's will be the basis of most of the recovery + * routines. + */ + + dlm_create_root_list(ls); + + /* + * Free all the tossed rsb's so we don't have to recover them. + */ + + dlm_clear_toss_list(ls); + + /* + * Add or remove nodes from the lockspace's ls_nodes list. + * Also waits for all nodes to complete dlm_recover_members. + */ + + error = dlm_recover_members(ls, rv, &neg); + if (error) { + log_error(ls, "recover_members failed %d", error); + goto fail; + } + start = jiffies; + + /* + * Rebuild our own share of the directory by collecting from all other + * nodes their master rsb names that hash to us. + */ + + error = dlm_recover_directory(ls); + if (error) { + log_error(ls, "recover_directory failed %d", error); + goto fail; + } + + /* + * Purge directory-related requests that are saved in requestqueue. + * All dir requests from before recovery are invalid now due to the dir + * rebuild and will be resent by the requesting nodes. + */ + + dlm_purge_requestqueue(ls); + + /* + * Wait for all nodes to complete directory rebuild. + */ + + error = dlm_recover_directory_wait(ls); + if (error) { + log_error(ls, "recover_directory_wait failed %d", error); + goto fail; + } + + /* + * We may have outstanding operations that are waiting for a reply from + * a failed node. Mark these to be resent after recovery. Unlock and + * cancel ops can just be completed. + */ + + dlm_recover_waiters_pre(ls); + + error = dlm_recovery_stopped(ls); + if (error) + goto fail; + + if (neg || dlm_no_directory(ls)) { + /* + * Clear lkb's for departed nodes. + */ + + dlm_purge_locks(ls); + + /* + * Get new master nodeid's for rsb's that were mastered on + * departed nodes. + */ + + error = dlm_recover_masters(ls); + if (error) { + log_error(ls, "recover_masters failed %d", error); + goto fail; + } + + /* + * Send our locks on remastered rsb's to the new masters. + */ + + error = dlm_recover_locks(ls); + if (error) { + log_error(ls, "recover_locks failed %d", error); + goto fail; + } + + error = dlm_recover_locks_wait(ls); + if (error) { + log_error(ls, "recover_locks_wait failed %d", error); + goto fail; + } + + /* + * Finalize state in master rsb's now that all locks can be + * checked. This includes conversion resolution and lvb + * settings. + */ + + dlm_recover_rsbs(ls); + } + + dlm_release_root_list(ls); + + dlm_set_recover_status(ls, DLM_RS_DONE); + error = dlm_recover_done_wait(ls); + if (error) { + log_error(ls, "recover_done_wait failed %d", error); + goto fail; + } + + dlm_clear_members_gone(ls); + + error = enable_locking(ls, rv->seq); + if (error) { + log_error(ls, "enable_locking failed %d", error); + goto fail; + } + + error = dlm_process_requestqueue(ls); + if (error) { + log_error(ls, "process_requestqueue failed %d", error); + goto fail; + } + + error = dlm_recover_waiters_post(ls); + if (error) { + log_error(ls, "recover_waiters_post failed %d", error); + goto fail; + } + + dlm_grant_after_purge(ls); + + dlm_astd_wake(); + + log_debug(ls, "recover %llx done: %u ms", rv->seq, + jiffies_to_msecs(jiffies - start)); + mutex_unlock(&ls->ls_recoverd_active); + + return 0; + + fail: + dlm_release_root_list(ls); + log_debug(ls, "recover %llx error %d", rv->seq, error); + mutex_unlock(&ls->ls_recoverd_active); + return error; +} + +static void do_ls_recovery(struct dlm_ls *ls) +{ + struct dlm_recover *rv = NULL; + + spin_lock(&ls->ls_recover_lock); + rv = ls->ls_recover_args; + ls->ls_recover_args = NULL; + clear_bit(LSFL_RECOVERY_STOP, &ls->ls_flags); + spin_unlock(&ls->ls_recover_lock); + + if (rv) { + ls_recover(ls, rv); + kfree(rv->nodeids); + kfree(rv); + } +} + +static int dlm_recoverd(void *arg) +{ + struct dlm_ls *ls; + + ls = dlm_find_lockspace_local(arg); + if (!ls) { + log_print("dlm_recoverd: no lockspace %p", arg); + return -1; + } + + while (!kthread_should_stop()) { + set_current_state(TASK_INTERRUPTIBLE); + if (!test_bit(LSFL_WORK, &ls->ls_flags)) + schedule(); + set_current_state(TASK_RUNNING); + + if (test_and_clear_bit(LSFL_WORK, &ls->ls_flags)) + do_ls_recovery(ls); + } + + dlm_put_lockspace(ls); + return 0; +} + +void dlm_recoverd_kick(struct dlm_ls *ls) +{ + set_bit(LSFL_WORK, &ls->ls_flags); + wake_up_process(ls->ls_recoverd_task); +} + +int dlm_recoverd_start(struct dlm_ls *ls) +{ + struct task_struct *p; + int error = 0; + + p = kthread_run(dlm_recoverd, ls, "dlm_recoverd"); + if (IS_ERR(p)) + error = PTR_ERR(p); + else + ls->ls_recoverd_task = p; + return error; +} + +void dlm_recoverd_stop(struct dlm_ls *ls) +{ + kthread_stop(ls->ls_recoverd_task); +} + +void dlm_recoverd_suspend(struct dlm_ls *ls) +{ + wake_up(&ls->ls_wait_general); + mutex_lock(&ls->ls_recoverd_active); +} + +void dlm_recoverd_resume(struct dlm_ls *ls) +{ + mutex_unlock(&ls->ls_recoverd_active); +} + |