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23e8e1aaac
Instead of creating our own kthread (dlm_astd) to deliver callbacks for all lockspaces, use a per-lockspace workqueue to deliver the callbacks. This eliminates complications and slowdowns from many lockspaces sharing the same thread. Signed-off-by: David Teigland <teigland@redhat.com>
318 lines
7.2 KiB
C
318 lines
7.2 KiB
C
/******************************************************************************
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*******************************************************************************
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**
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** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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**
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** This copyrighted material is made available to anyone wishing to use,
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** modify, copy, or redistribute it subject to the terms and conditions
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** of the GNU General Public License v.2.
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**
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*******************************************************************************
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******************************************************************************/
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#include "dlm_internal.h"
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#include "lockspace.h"
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#include "member.h"
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#include "dir.h"
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#include "ast.h"
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#include "recover.h"
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#include "lowcomms.h"
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#include "lock.h"
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#include "requestqueue.h"
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#include "recoverd.h"
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/* If the start for which we're re-enabling locking (seq) has been superseded
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by a newer stop (ls_recover_seq), we need to leave locking disabled.
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We suspend dlm_recv threads here to avoid the race where dlm_recv a) sees
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locking stopped and b) adds a message to the requestqueue, but dlm_recoverd
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enables locking and clears the requestqueue between a and b. */
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static int enable_locking(struct dlm_ls *ls, uint64_t seq)
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{
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int error = -EINTR;
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down_write(&ls->ls_recv_active);
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spin_lock(&ls->ls_recover_lock);
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if (ls->ls_recover_seq == seq) {
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set_bit(LSFL_RUNNING, &ls->ls_flags);
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/* unblocks processes waiting to enter the dlm */
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up_write(&ls->ls_in_recovery);
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error = 0;
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}
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spin_unlock(&ls->ls_recover_lock);
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up_write(&ls->ls_recv_active);
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return error;
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}
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static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv)
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{
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unsigned long start;
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int error, neg = 0;
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log_debug(ls, "recover %llx", (unsigned long long)rv->seq);
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mutex_lock(&ls->ls_recoverd_active);
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dlm_callback_suspend(ls);
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/*
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* Free non-master tossed rsb's. Master rsb's are kept on toss
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* list and put on root list to be included in resdir recovery.
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*/
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dlm_clear_toss_list(ls);
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/*
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* This list of root rsb's will be the basis of most of the recovery
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* routines.
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*/
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dlm_create_root_list(ls);
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/*
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* Add or remove nodes from the lockspace's ls_nodes list.
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* Also waits for all nodes to complete dlm_recover_members.
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*/
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error = dlm_recover_members(ls, rv, &neg);
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if (error) {
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log_debug(ls, "recover_members failed %d", error);
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goto fail;
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}
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start = jiffies;
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/*
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* Rebuild our own share of the directory by collecting from all other
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* nodes their master rsb names that hash to us.
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*/
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error = dlm_recover_directory(ls);
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if (error) {
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log_debug(ls, "recover_directory failed %d", error);
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goto fail;
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}
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/*
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* Wait for all nodes to complete directory rebuild.
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*/
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error = dlm_recover_directory_wait(ls);
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if (error) {
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log_debug(ls, "recover_directory_wait failed %d", error);
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goto fail;
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}
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/*
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* We may have outstanding operations that are waiting for a reply from
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* a failed node. Mark these to be resent after recovery. Unlock and
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* cancel ops can just be completed.
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*/
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dlm_recover_waiters_pre(ls);
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error = dlm_recovery_stopped(ls);
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if (error)
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goto fail;
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if (neg || dlm_no_directory(ls)) {
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/*
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* Clear lkb's for departed nodes.
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*/
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dlm_purge_locks(ls);
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/*
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* Get new master nodeid's for rsb's that were mastered on
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* departed nodes.
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*/
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error = dlm_recover_masters(ls);
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if (error) {
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log_debug(ls, "recover_masters failed %d", error);
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goto fail;
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}
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/*
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* Send our locks on remastered rsb's to the new masters.
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*/
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error = dlm_recover_locks(ls);
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if (error) {
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log_debug(ls, "recover_locks failed %d", error);
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goto fail;
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}
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error = dlm_recover_locks_wait(ls);
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if (error) {
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log_debug(ls, "recover_locks_wait failed %d", error);
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goto fail;
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}
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/*
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* Finalize state in master rsb's now that all locks can be
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* checked. This includes conversion resolution and lvb
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* settings.
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*/
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dlm_recover_rsbs(ls);
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} else {
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/*
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* Other lockspace members may be going through the "neg" steps
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* while also adding us to the lockspace, in which case they'll
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* be doing the recover_locks (RS_LOCKS) barrier.
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*/
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dlm_set_recover_status(ls, DLM_RS_LOCKS);
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error = dlm_recover_locks_wait(ls);
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if (error) {
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log_debug(ls, "recover_locks_wait failed %d", error);
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goto fail;
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}
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}
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dlm_release_root_list(ls);
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/*
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* Purge directory-related requests that are saved in requestqueue.
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* All dir requests from before recovery are invalid now due to the dir
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* rebuild and will be resent by the requesting nodes.
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*/
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dlm_purge_requestqueue(ls);
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dlm_set_recover_status(ls, DLM_RS_DONE);
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error = dlm_recover_done_wait(ls);
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if (error) {
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log_debug(ls, "recover_done_wait failed %d", error);
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goto fail;
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}
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dlm_clear_members_gone(ls);
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dlm_adjust_timeouts(ls);
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dlm_callback_resume(ls);
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error = enable_locking(ls, rv->seq);
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if (error) {
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log_debug(ls, "enable_locking failed %d", error);
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goto fail;
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}
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error = dlm_process_requestqueue(ls);
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if (error) {
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log_debug(ls, "process_requestqueue failed %d", error);
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goto fail;
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}
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error = dlm_recover_waiters_post(ls);
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if (error) {
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log_debug(ls, "recover_waiters_post failed %d", error);
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goto fail;
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}
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dlm_grant_after_purge(ls);
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log_debug(ls, "recover %llx done: %u ms",
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(unsigned long long)rv->seq,
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jiffies_to_msecs(jiffies - start));
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mutex_unlock(&ls->ls_recoverd_active);
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return 0;
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fail:
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dlm_release_root_list(ls);
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log_debug(ls, "recover %llx error %d",
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(unsigned long long)rv->seq, error);
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mutex_unlock(&ls->ls_recoverd_active);
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return error;
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}
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/* The dlm_ls_start() that created the rv we take here may already have been
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stopped via dlm_ls_stop(); in that case we need to leave the RECOVERY_STOP
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flag set. */
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static void do_ls_recovery(struct dlm_ls *ls)
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{
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struct dlm_recover *rv = NULL;
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spin_lock(&ls->ls_recover_lock);
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rv = ls->ls_recover_args;
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ls->ls_recover_args = NULL;
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if (rv && ls->ls_recover_seq == rv->seq)
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clear_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
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spin_unlock(&ls->ls_recover_lock);
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if (rv) {
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ls_recover(ls, rv);
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kfree(rv->nodeids);
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kfree(rv->new);
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kfree(rv);
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}
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}
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static int dlm_recoverd(void *arg)
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{
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struct dlm_ls *ls;
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ls = dlm_find_lockspace_local(arg);
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if (!ls) {
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log_print("dlm_recoverd: no lockspace %p", arg);
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return -1;
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}
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while (!kthread_should_stop()) {
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set_current_state(TASK_INTERRUPTIBLE);
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if (!test_bit(LSFL_WORK, &ls->ls_flags))
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schedule();
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set_current_state(TASK_RUNNING);
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if (test_and_clear_bit(LSFL_WORK, &ls->ls_flags))
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do_ls_recovery(ls);
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}
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dlm_put_lockspace(ls);
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return 0;
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}
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void dlm_recoverd_kick(struct dlm_ls *ls)
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{
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set_bit(LSFL_WORK, &ls->ls_flags);
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wake_up_process(ls->ls_recoverd_task);
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}
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int dlm_recoverd_start(struct dlm_ls *ls)
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{
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struct task_struct *p;
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int error = 0;
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p = kthread_run(dlm_recoverd, ls, "dlm_recoverd");
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if (IS_ERR(p))
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error = PTR_ERR(p);
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else
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ls->ls_recoverd_task = p;
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return error;
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}
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void dlm_recoverd_stop(struct dlm_ls *ls)
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{
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kthread_stop(ls->ls_recoverd_task);
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}
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void dlm_recoverd_suspend(struct dlm_ls *ls)
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{
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wake_up(&ls->ls_wait_general);
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mutex_lock(&ls->ls_recoverd_active);
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}
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void dlm_recoverd_resume(struct dlm_ls *ls)
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{
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mutex_unlock(&ls->ls_recoverd_active);
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}
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